Fix mua_wrapper defers not turning into fails for problems such as
[exim.git] / doc / doc-txt / ChangeLog
CommitLineData
47c7a64a 1$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.177 2005/06/28 10:23:35 ph10 Exp $
495ae4b0
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2
3Change log file for Exim from version 4.21
4-------------------------------------------
5
bbe902f0 6
e5a9dba6
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7Exim version 4.52
8-----------------
9
10TF/01 Added support for Client SMTP Authorization. See NewStuff for details.
11
22c3b60b
PH
12PH/01 When a transport filter timed out in a pipe delivery, and the pipe
13 command itself ended in error, the underlying message about the transport
14 filter timeout was being overwritten with the pipe command error. Now the
15 underlying error message should be appended to the second error message.
16
06a9b4b5
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17TK/01 Fix poll() being unavailable on Mac OSX 10.2.
18
c1ac6996
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19PH/02 Reduce the amount of output that "make" produces by default. Full output
20 can still be requested.
21
9c7a242c
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22PH/03 The warning log line about a condition test deferring for a "warn" verb
23 was being output only once per connection, rather than after each
24 occurrence (because it was using the same function as for successful
25 "warn" verbs). This seems wrong, so I have changed it.
26
87ba3f5f
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27TF/02 Two buglets in acl.c which caused Exim to read a few bytes of memory that
28 it should not have, which might have caused a crash in the right
29 circumstances, but probably never did.
30
31PH/04 Installed a modified version of Tony Finch's patch to make submission
32 mode fix the return path as well as the Sender: header line, and to
33 add a /name= option so that you can make the user's friendly name appear
34 in the header line.
35
29aba418
TF
36TF/03 Added the control = fakedefer ACL modifier.
37
fe0dab11
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38TF/04 Added the ratelimit ACL condition. See NewStuff for details. Thanks to
39 Mark Lowes for thorough testing.
870f6ba8 40
11d337a4
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41TK/02 Rewrote SPF support to work with libspf2 versions >1.2.0.
42
43TK/03 Merged latest SRS patch from Miles Wilton.
44
415c8f3b
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45PH/05 There's a shambles in IRIX6 - it defines EX_OK in unistd.h which conflicts
46 with the definition in sysexits.h (which is #included earlier).
47 Fortunately, Exim does not actually use EX_OK. The code used to try to
48 preserve the sysexits.h value, by assumimg that macro definitions were
49 scanned for macro replacements. I have been disabused of this notion,
50 so now the code just undefines EX_OK before #including unistd.h.
11d337a4 51
958541e9
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52PH/06 There is a timeout for writing blocks of data, set by, e.g. data_timeout
53 in the smtp transport. When a block could not be written in a single
54 write() function, the timeout was being re-applied to each part-write.
55 This seems wrong - if the receiver was accepting one byte at a time it
56 would take for ever. The timeout is now adjusted when this happens. It
57 doesn't have to be particularly precise.
58
c206415f
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59TK/04 Added simple SPF lookup method in EXPERIMENTAL_SPF. See NewStuff for
60 details. Thanks to Chris Webb <chris@arachsys.com> for the patch!
61
2a4be8f9
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62PH/07 Added "fullpostmaster" verify option, which does a check to <postmaster>
63 without a domain if the check to <postmaster@domain> fails.
64
1cba11c5
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65SC/01 Eximstats: added -xls and the ability to specify output files
66 (patch written by Frank Heydlauf).
67
68SC/02 Eximstats: use FileHandles for outputing results.
69
70SC/03 Eximstats: allow any combination of xls, txt, and html output.
71
72SC/04 Eximstats: fixed display of large numbers with -nvr option
73
74SC/05 Eximstats: fixed merging of reports with empty tables.
75
76SC/06 Eximstats: added the -include_original_destination flag
77
78SC/07 Eximstats: removed tabs and trailing whitespace.
79
1005d00e
TK
80TK/05 Malware: Improve on aveserver error handling. Patch from Alex Miller.
81
82TK/06 MBOX spool code: Add real "From " MBOX separator line
83 so the .eml file is really in mbox format (even though
84 most programs do not really care). Patch from Alex Miller.
85
86TK/07 MBOX spool code: Add X-Envelope-From: and X-Envelope-To: headers.
87 The latter is generated from $received_to and is only set if the
88 message has one envelope recipient. SA can use these headers,
89 obviously out-of-the-box. Patch from Alex Miller.
90
9b4768fa
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91PH/08 The ${def test on a variable was returning false if the variable's
92 value was "0", contrary to what the specification has always said!
93 The result should be true unless the variable is empty.
94
95PH/09 The syntax error of a character other than { following "${if
96 def:variable_name" (after optional whitespace) was not being diagnosed.
97 An expansion such as ${if def:sender_ident:{xxx}{yyy}} in which an
98 accidental colon was present, for example, could give incorrect results.
99
0d7eb84a
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100PH/10 Tidied the code in a number of places where the st_size field of a stat()
101 result is used (not including appendfile, where other changes are about
102 to be made).
103
104PH/11 Upgraded appendfile so that quotas larger than 2G are now supported.
105 This involved changing a lot of size variables from int to off_t. It
106 should work with maildirs and everything.
107
40727bee
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108TK/08 Apply fix provided by Michael Haardt to prevent deadlock in case of
109 spamd dying while we are connected to it.
110
554d2369
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111TF/05 Fixed a ${extract error message typo reported by Jeremy Harris
112 <jgh@wizmail.org>
113
1f922db1
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114PH/12 Applied Alex Kiernan's patch for the API change for the error callback
115 function for BDB 4.3.
116
ef213c3b
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117PH/13 Changed auto_thaw such that it does not apply to bounce messages.
118
8ac170f3
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119PH/14 Imported PCRE 6.0; this was more than just a trivial operation because
120 the sources for PCRE have been re-arranged and more files are now
121 involved.
122
b1c749bb
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123PH/15 The code I had for printing potentially long long variables in PH/11
124 above was not the best (it lost precision). The length of off_t variables
125 is now inspected at build time, and an appropriate printing format (%ld
c6c2dc1d
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126 or %lld) is chosen and #defined by OFF_T_FMT. We also define LONGLONG_T
127 to be "long long int" or "long int". This is needed for the internal
128 formatting function string_vformat().
b1c749bb 129
4aac9b49
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130PH/16 Applied Matthew Newton's patch to exicyclog: "If log_file_path is set in
131 the configuration file to be ":syslog", then the script "guesses" where
132 the logs files are, rather than using the compiled in default. In our
133 case the guess is not the same as the compiled default, so the script
134 suddenly stopped working when I started to use syslog. The patch checks
135 to see if log_file_path is "". If so, it attempts to read it from exim
136 with no configuration file to get the compiled in version, before it
137 falls back to the previous guessing code."
138
294520c8
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139TK/09 Added "prvs" and "prvscheck" expansion items. These help a lot with
140 implementing BATV in an Exim configuration. See NewStuff for the gory
141 details.
142
5bd022fe
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143PH/17 Applied Michael Haardt's patch for HP-UX, affecting only the os.h and
144 Makefile that are specific to HP-UX.
145
90e9ce59
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146PH/18 If the "use_postmaster" option was set for a recipient callout together
147 with the "random" option, the postmaster address was used as the MAIL
148 FROM address for the random test, but not for the subsequent recipient
149 test. It is now used for both.
150
5ea81592
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151PH/19 Applied Michael Haardt's patch to update Sieve to RFC3028bis. "The
152 patch removes a few documentation additions to RFC 3028, because the
153 latest draft now contains them. It adds the new en;ascii-case comparator
154 and a new error check for 8bit text in MIME parts. Comparator and
155 require names are now matched exactly. I enabled the subaddress
156 extension, but it is not well tested yet (read: it works for me)."
157
c6c2dc1d
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158PH/20 Added macros for time_t as for off_t (see PH/15 above) and used them to
159 rework some of the code of TK/09 above to avoid the hardwired use of
160 "%lld" and "long long". Replaced the call to snprintf() with a call to
161 string_vformat().
162
ca02eafb
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163PH/21 Added another message to those in 4.51/PH/42, namely "All relevant MX
164 records point to non-existent hosts".
165
9a26b6b2
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166PH/22 Fixed some oversights/typos causing bugs when Exim is compiled with
167 experimental DomainKeys support:
168
169 (1) The filter variables $n0-$n9 and $sn0-$sn9 were broken.
170 (2) On an error such as an illegally used "control", the wrong name for
171 the control was given.
172
173 These problems did NOT occur unless DomainKeys support was compiled.
174
4aee0225
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175PH/23 Added daemon_startup_retries and daemon_startup_sleep.
176
32d668a5
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177PH/24 Added ${if match_ip condition.
178
8187c3f3
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179PH/25 Put debug statements on either side of calls to EXIM_DBOPEN() for hints
180 databases so that it will be absolutely obvious if a crash occurs in the
181 DB library. This is a regular occurrence (often caused by mis-matched
182 db.h files).
183
ff790e47 184PH/26 Insert a lot of missing (void) casts for functions such as chown(),
f1e894f3
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185 chmod(), fcntl(), sscanf(), and other functions from stdio.h. These were
186 picked up on a user's system that detects such things. There doesn't seem
187 to be a gcc warning option for this - only an attribute that has to be
188 put on the function's prototype. It seems that in Fedora Core 4 they have
189 set this on a number of new functions. No doubt there will be more in due
190 course.
ff790e47 191
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192PH/27 If a dnslookup or manualroute router is set with verify=only, it need not
193 specify a transport. However, if an address that was verified by such a
194 router was the subject of a callout, Exim crashed because it tried to
195 read the rcpt_include_affixes from the non-existent transport. Now it
196 just assumes that the setting of that option is false. This bug was
197 introduced by 4.51/PH/31.
198
59cf8544
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199PH/28 Changed -d+all to exclude +memory, because that information is very
200 rarely of interest, but it makes the output a lot bigger. People tend to
201 do -d+all out of habit.
202
e7ad8a65
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203PH/29 Removed support for the Linux-libc5 build, as it is obsolete and the
204 code in os-type was giving problems when libc.so lives in lib64, like on
205 x86_64 Fedora Core.
206
ade42478
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207PH/30 Exim's DNS code uses the original T_xxx names for DNS record times. These
208 aren't the modern standard, and it seems that some systems' include files
209 don't always have them. Exim was already checking for some of the newer
210 ones like T_AAAA, and defining it itself. I've added checks for all the
211 record types that Exim uses.
212
182ad5cf
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213PH/31 When using GnuTLS, if the parameters cache file did not exist, Exim was
214 not automatically generating a new one, as it is supposed to. This
215 prevented TLS from working. If the file did exist, but contained invalid
216 data, a new version was generated, as expected. It was only the case of a
217 non-existent file that was broken.
218
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219TK/10 Domainkeys: Fix a bug in verification that caused a crash in conjunction
220 with a change in libdomainkeys > 0.64.
221
222TK/11 Domainkeys: Change the logic how the "testing" policy flag is retrieved
223 from DNS. If the selector record carries the flag, it now has
224 precedence over the domain-wide flag.
225
226TK/12 Cleared some compiler warnings related to SPF, SRS and DK code.
227
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228PH/32 In mua_wrapper mode, if an smtp transport configuration error (such as
229 the use of a port name that isn't defined in /etc/services) occurred, the
230 message was deferred as in a normal delivery, and thus remained on the
231 spool, instead of being failed because of the mua_wrapper setting. This
232 is now fixed, and I tidied up some of the mua_wrapper messages at the
233 same time.
234
e7ad8a65 235
7982096b
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236Exim version 4.51
237-----------------
238
1a46a8c5
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239TK/01 Added Yahoo DomainKeys support via libdomainkeys. See
240 doc/experimental-spec.txt for details. (http://domainkeys.sf.net)
241
2f079f46 242TK/02 Fix ACL "control" statement not being available in MIME ACL.
1a46a8c5
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243
244TK/03 Fix ACL "regex" condition not being available in MIME ACL.
245
246PH/01 Installed a patch from the Sieve maintainer that allows -bf to be used
247 to test Sieve filters that use "vacation".
248
249PH/02 Installed a slightly modified version of Nikos Mavrogiannopoulos' patch
250 that changes the way the GnuTLS parameters are stored in the cache file.
251 The new format can be generated externally. For backward compatibility,
252 if the data in the cache doesn't make sense, Exim assumes it has read an
253 old-format file, and it generates new data and writes a new file. This
254 means that you can't go back to an older release without removing the
255 file.
256
257PH/03 A redirect router that has both "unseen" and "one_time" set does not
258 work if there are any delivery delays because "one_time" forces the
259 parent to be marked "delivered", so its unseen clone is never tried
260 again. For this reason, Exim now forbids the simultaneous setting of
261 these two options.
262
263PH/04 Change 4.11/85 fixed an obscure bug concerned with addresses that are
264 redirected to themselves ("homonym" addresses). Read the long ChangeLog
265 entry if you want to know the details. The fix, however, neglected to
266 consider the case when local delivery batching is involved. The test for
267 "previously delivered" was not happening when checking to see if an
268 address could be batched with a previous (undelivered) one; under
269 certain circumstances this could lead to multiple deliveries to the same
c2c19e9d 270 address.
1a46a8c5
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271
272PH/05 Renamed the macro SOCKLEN_T as EXIM_SOCKLEN_T because AIX uses SOCKLEN_T
273 in its include files, and this causes problems building Exim.
274
275PH/06 A number of "verify =" ACL conditions have no options (e.g. verify =
276 header_syntax) but Exim was just ignoring anything given after a slash.
277 In particular, this caused confusion with an attempt to use "verify =
278 reverse_host_lookup/defer_ok". An error is now given when options are
279 supplied for verify items that do not have them. (Maybe reverse_host_
280 lookup should have a defer_ok option, but that's a different point.)
281
282PH/07 Increase the size of the buffer for incoming SMTP commands from 512 (as
283 defined by RFC 821) to 2048, because there were problems with some AUTH
284 commands, and RFC 1869 says the size should be increased for extended
285 SMTP commands that take arguments.
286
287PH/08 Added ${dlfunc dynamically loaded function for expansion (code from Tony
288 Finch).
289
290PH/09 Previously, an attempt to use ${perl when it wasn't compiled gave an
291 "unknown" error; now it says that the functionality isn't in the binary.
8d67ada3 292
49c2d5ea
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293PH/10 Added a nasty fudge to try to recognize and flatten LDAP passwords in
294 an address' error message when a string expansion fails (syntax or
f331f3b6
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295 whatever). Otherwise the password may appear in the log. Following change
296 PH/42 below, there is no longer a chance of it appearing in a bounce
297 message.
49c2d5ea 298
bf759a8b
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299PH/11 Installed exipick version 20050225.0 from John Jetmore.
300
83364d30
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301PH/12 If the last host in a fallback_hosts list was multihomed, only the first
302 of its addresses was ever tried. (Bugzilla bug #2.)
303
7999bbd7
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304PH/13 If "headers_add" in a transport didn't end in a newline, Exim printed
305 the result incorrectly in the debug output. (It correctly added a newline
306 to what was transported.)
307
7dbf77c9
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308TF/01 Added $received_time.
309
74e0617f
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310PH/14 Modified the default configuration to add an acl_smtp_data ACL, with
311 commented out examples of how to interface to a virus scanner and to
312 SpamAssassin. Also added commented examples of av_scanner and
313 spamd_address settings.
314
2f079f46
PH
315PH/15 Further to TK/02 and TK/03 above, tidied up the tables of what conditions
316 and controls are allowed in which ACLs. There were a couple of minor
317 errors. Some of the entries in the conditions table (which is a table of
318 where they are NOT allowed) were getting very unwieldy; rewrote them as a
319 negation of where the condition IS allowed.
320
8c841523
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321PH/16 Installed updated OS/os.c-cygwin from the Cygwin maintainer.
322
7766a4f0
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323PH/17 The API for radiusclient changed at release 0.4.0. Unfortunately, the
324 header file does not have a version number, so I've had to invent a new
325 value for RADIUS_LIB_TYPE, namely "RADIUSCLIENTNEW" to request the new
326 API. The code is untested by me (my Linux distribution still has 0.3.2 of
327 radiusclient), but it was contributed by a Radius user.
328
8b417f2c
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329PH/18 Installed Lars Mainka's patch for the support of CRL collections in
330 files or directories, for OpenSSL.
331
901f42cb
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332PH/19 When an Exim process that is running as root has to create an Exim log
333 file, it does so in a subprocess that runs as exim:exim so as to get the
334 ownership right at creation (otherwise, other Exim processes might see
335 the file with the wrong ownership). There was no test for failure of this
336 fork() call, which would lead to the process getting stuck as it waited
337 for a non-existent subprocess. Forks do occasionally fail when resources
338 run out. I reviewed all the other calls to fork(); they all seem to check
339 for failure.
340
f9b9210e
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341PH/20 When checking for unexpected SMTP input at connect time (before writing
342 the banner), Exim was not dealing correctly with a non-positive return
343 from the read() function. If the client had disconnected by this time,
344 the result was a log entry for a synchronization error with an empty
345 string after "input=" when read() returned zero. If read() returned -1
346 (an event I could not check), uninitialized data bytes were printed.
347 There were reports of junk text (parts of files, etc) appearing after
348 "input=".
349
54cdb463
PH
350PH/21 Added acl_not_smtp_mime to allow for MIME scanning for non-SMTP messages.
351
cf00dad6
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352PH/22 Added support for macro redefinition, and (re)definition in between
353 driver and ACL definitions.
354
acb1b346
PH
355PH/23 The cyrus_sasl authenticator was expanding server_hostname, but then
356 forgetting to use the resulting value; it was using the unexpanded value.
357
c5ddb310
PH
358PH/24 The cyrus_sasl authenticator was advertising mechanisms for which it
359 hadn't been configured. The fix is from Juergen Kreileder, who
360 understands it better than I do:
361
362 "Here's what I see happening with three configured cyrus_sasl
363 authenticators configured (plain, login, cram-md5):
364
365 On startup auth_cyrus_sasl_init() gets called for each of these.
366 This means three calls to sasl_listmech() without a specified mech_list.
367 => SASL tests which mechs of all available mechs actually work
368 => three warnings about OTP not working
369 => the returned list contains: plain, login, cram-md5, digest-md5, ...
370
371 With the patch, sasl_listmech() also gets called three times. But now
372 SASL's mech_list option is set to the server_mech specified in the the
373 authenticator. Or in other words, the answer from sasl_listmech()
374 gets limited to just the mech you're testing for (which is different
375 for each call.)
376 => the return list contains just 'plain' or 'login', 'cram-md5' or
377 nothing depending on the value of ob->server_mech.
378
379 I've just tested the patch: Authentication still works fine,
380 unavailable mechs specified in the exim configuration are still
381 caught, and the auth.log warnings about OTP are gone."
382
31619da6
PH
383PH/25 When debugging is enabled, the contents of the command line are added
384 to the debugging output, even when log_selector=+arguments is not
385 specified.
386
bebaf0fc
PH
387PH/26 Change scripts/os-type so that when "uname -s" returns just "GNU", the
388 answer is "GNU", and only if the return is "GNU/something" is the answer
389 "Linux".
390
475fe28a
PH
391PH/27 $acl_verify_message is now set immediately after the failure of a
392 verification in an ACL, and so is available in subsequent modifiers. In
393 particular, the message can be preserved by coding like this:
394
395 warn !verify = sender
396 set acl_m0 = $acl_verify_message
397
398 Previously, $acl_verify_message was set only while expanding "message"
399 and "log_message" when a very denied access.
400
7e8bec7a
PH
401PH/28 Modified OS/os.c-Linux with
402
403 -#ifndef OS_LOAD_AVERAGE
404 +#if !defined(OS_LOAD_AVERAGE) && defined(__linux__)
405
406 to make Exim compile on kfreebsd-gnu. (I'm totally confused about the
407 nomenclature these days.)
408
e4a89c47
PH
409PH/29 Installed patch from the Sieve maintainer that adds the options
410 sieve_useraddress and sieve_subaddress to the redirect router.
411
5ca2a9a1
PH
412PH/30 In these circumstances:
413 . Two addresses routed to the same list of hosts;
414 . First host does not offer TLS;
415 . First host accepts first address;
416 . First host gives temporary error to second address;
417 . Second host offers TLS and a TLS session is established;
418 . Second host accepts second address.
419 Exim incorrectly logged both deliveries with the TLS parameters (cipher
420 and peerdn, if requested) that were in fact used only for the second
421 address.
7e8bec7a 422
c688b954
PH
423PH/31 When doing a callout as part of verifying an address, Exim was not paying
424 attention to any local part prefix or suffix that was matched by the
425 router that accepted the address. It now behaves in the same way as it
426 does for delivery: the affixes are removed from the local part unless
427 rcpt_include_affixes is set on the transport.
428
fed77020
PH
429PH/32 Add the sender address, as F=<...>, to the log line when logging a
430 timeout during the DATA phase of an incoming message.
431
7fe1560f
PH
432PH/33 Sieve envelope tests were broken for match types other than :is. I have
433 applied a patch sanctioned by the Sieve maintainer.
c688b954 434
ebb6e6d5
PH
435PH/34 Change 4.50/80 broke Exim in that it could no longer handle cases where
436 the uid or gid is negative. A case of a negative gid caused this to be
437 noticed. The fix allows for either to be negative.
438
9c4e8f60
PH
439PH/35 ACL_WHERE_MIME is now declared unconditionally, to avoid too much code
440 clutter, but the tables that are indexed by ACL_WHERE_xxx values had been
441 overlooked.
442
443PH/36 The change PH/12 above was broken. Fixed it.
444
d7174846
PH
445PH/37 Exim used to check for duplicate addresses in the middle of routing, on
446 the grounds that routing the same address twice would always produce the
447 same answer. This might have been true once, but it is certainly no
448 longer true now. Routing a child address may depend on the previous
449 routing that produced that child. Some complicated redirection strategies
450 went wrong when messages had multiple recipients, and made Exim's
451 behaviour dependent on the order in which the addresses were given.
452
453 I have moved the duplicate checking until after the routing is complete.
454 Exim scans the addresses that are assigned to local and remote
455 transports, and removes any duplicates. This means that more work will be
456 done, as duplicates will always all be routed, but duplicates are
457 presumably rare, so I don't expect this is of any significance.
458
459 For deliveries to pipes, files, and autoreplies, the duplicate checking
460 still happens during the routing process, since they are not going to be
461 routed further.
462
cfe75fc3
PH
463PH/38 Installed a patch from Ian Freislich, with the agreement of Tom Kistner.
464 It corrects a timeout issue with spamd. This is Ian's comment: "The
465 background is that sometimes spamd either never reads data from a
466 connection it has accepted, or it never writes response data. The exiscan
467 spam.[ch] uses a 3600 second timeout on spamd socket reads, further, it
468 blindly assumes that writes won't block so it may never time out."
469
be22d70e
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470PH/39 Allow G after quota size as well as K and M.
471
0612b098
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472PH/40 The value set for $authenticated_id in an authenticator may not contain
473 binary zeroes or newlines because the value is written to log lines and
474 to spool files. There was no check on this. Now the value is run through
475 the string_printing() function so that such characters are converted to
476 printable escape sequences.
477
2e0c1448
PH
478PH/41 $message_linecount is a new variable that contains the total number of
479 lines in the message. Compare $body_linecount, which is the count for the
480 body only.
481
447d236c
PH
482PH/42 Exim no longer gives details of delivery errors for specific addresses in
483 bounce and delay warning messages, except in certain special cases, which
484 are as follows:
485
486 (a) An SMTP error message from a remote host;
487 (b) A message specified in a :fail: redirection;
488 (c) A message specified in a "fail" command in a system filter;
489 (d) A message specified in a FAIL return from the queryprogram router;
490 (e) A message specified by the cannot_route_message router option.
491
492 In these cases only, Exim does include the error details in bounce and
493 warning messages. There are also a few cases where bland messages such
494 as "unrouteable address" or "local delivery error" are given.
495
d20976dc
PH
496PH/43 $value is now also set for the "else" part of a ${run expansion.
497
f656d135
PH
498PH/44 Applied patch from the Sieve maintainer: "The vacation draft is still
499 being worked on, but at least Exim now implements the latest version to
500 play with."
501
2e2a30b4
PH
502PH/45 In a pipe transport, although a timeout while waiting for the pipe
503 process to complete was treated as a delivery failure, a timeout while
504 writing the message to the pipe was logged, but erroneously treated as a
505 successful delivery. Such timeouts include transport filter timeouts. For
506 consistency with the overall process timeout, these timeouts are now
507 treated as errors, giving rise to delivery failures by default. However,
508 there is now a new Boolean option for the pipe transport called
509 timeout_defer, which, if set TRUE, converts the failures into defers for
510 both kinds of timeout. A transport filter timeout is now identified in
511 the log output.
512
9176e9f0
PH
513PH/46 The "scripts/Configure-config.h" script calls "make" at one point. On
514 systems where "make" and "gmake" are different, calling "gmake" at top
515 level broke things. I've arranged for the value of $(MAKE) to be passed
516 from the Makefile to this script so that it can call the same version of
517 "make".
518
7982096b 519
bbe902f0
PH
520A note about Exim versions 4.44 and 4.50
521----------------------------------------
522
523Exim 4.50 was meant to be the next release after 4.43. It contains a lot of
524changes of various kinds. As a consequence, a big documentation update was
525needed. This delayed the release for rather longer than seemed good, especially
526in the light of a couple of (minor) security issues. Therefore, the changes
527that fixed bugs were backported into 4.43, to create a 4.44 maintenance
528release. So 4.44 and 4.50 are in effect two different branches that both start
529from 4.43.
530
531I have left the 4.50 change log unchanged; it contains all the changes since
5324.43. The change log for 4.44 is below; many of its items are identical to
533those for 4.50. This seems to be the most sensible way to preserve the
534historical information.
535
536
f7b63901 537Exim version 4.50
495ae4b0
PH
538-----------------
539
5fe762f6
PH
540 1. Minor wording change to the doc/README.SIEVE file.
541
139059f6 542 2. Change 4.43/35 introduced a bug: if quota_filecount was set, the
5fe762f6 543 computation of the current number of files was incorrect.
495ae4b0 544
7086e875
PH
545 3. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
546 bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
547 place.
548
35af9f61
PH
549 4. Give more explanation in the error message when the command for a transport
550 filter fails to execute.
551
b668c215
PH
552 5. There are several places where Exim runs a non-Exim command in a
553 subprocess. The SIGUSR1 signal should be disabled for these processes. This
554 was being done only for the command run by the queryprogram router. It is
555 now done for all such subprocesses. The other cases are: ${run, transport
556 filters, and the commands run by the lmtp and pipe transports.
557
a494b1e1
PH
558 6. Added CONFIGURE_GROUP build-time option.
559
560 7. Some older OS have a limit of 256 on the maximum number of file
561 descriptors. Exim was using setrlimit() to set 1000 as a large value
562 unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
563 systems. I've change it so that if it can't get 1000, it tries for 256.
35edf2ff 564
c5fcb476
PH
565 8. "control=submission" was allowed, but had no effect, in a DATA ACL. This
566 was an oversight, and furthermore, ever since the addition of extra
567 controls (e.g. 4.43/32), the checks on when to allow different forms of
568 "control" were broken. There should now be diagnostics for all cases when a
569 control that does not make sense is encountered.
570
69358f02
PH
571 9. Added the /retain_sender option to "control=submission".
572
5be20824
PH
57310. $recipients is now available in the predata ACL (oversight).
574
eb2c0248
PH
57511. Tidy the search cache before the fork to do a delivery from a message
576 received from the command line. Otherwise the child will trigger a lookup
577 failure and thereby defer the delivery if it tries to use (for example) a
578 cached ldap connection that the parent has called unbind on.
579
2a3eea10
PH
58012. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
581 of $address_data from the recipient verification was clobbered by the
582 sender verification.
583
58413. The value of address_data from a sender verification is now available in
585 $sender_address_data in subsequent conditions in the ACL statement.
586
23c7ff99
PH
58714. Added forbid_sieve_filter and forbid_exim_filter to the redirect router.
588
4deaf07d
PH
58915. Added a new option "connect=<time>" to callout options, to set a different
590 connection timeout.
591
926e1192
PH
59216. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
593 was its contents. (It was OK if the option was not defined at all.)
594
650edc6f
PH
59517. A "Completed" log line is now written for messages that are removed from
596 the spool by the -Mrm option.
597
2c7db3f5
PH
59818. New variables $sender_verify_failure and $recipient_verify_failure contain
599 information about exactly what failed.
600
3d235903
PH
60119. Added -dd to debug only the daemon process.
602
7c7ad977
PH
60320. Incorporated Michael Haardt's patch to ldap.c for improving the way it
604 handles timeouts, both on the server side and network timeouts. Renamed the
605 CONNECT parameter as NETTIMEOUT (but kept the old name for compatibility).
606
981756db
PH
60721. The rare case of EHLO->STARTTLS->HELO was setting the protocol to "smtp".
608 It is now set to "smtps".
609
d4eb88df
PH
61022. $host_address is now set to the target address during the checking of
611 ignore_target_hosts.
612
61323. When checking ignore_target_hosts for an ipliteral router, no host name was
614 being passed; this would have caused $sender_host_name to have been used if
615 matching the list had actually called for a host name (not very likely,
616 since this list is usually IP addresses). A host name is now passed as
617 "[x.x.x.x]".
618
7d468ab8
PH
61924. Changed the calls that set up the SIGCHLD handler in the daemon to use the
620 code that specifies a non-restarting handler (typically sigaction() in
621 modern systems) in an attempt to fix a rare and obscure crash bug.
622
62325. Narrowed the window for a race in the daemon that could cause it to ignore
624 SIGCHLD signals. This is not a major problem, because they are used only to
625 wake it up if nothing else does.
626
62c0818f
PH
62726. A malformed maildirsize file could cause Exim to calculate negative values
628 for the mailbox size or file count. Odd effects could occur as a result.
629 The maildirsize information is now recalculated if the size or filecount
630 end up negative.
631
26034054
PH
63227. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
633 support for a long time. Removed HAVE_SYS_VFS_H.
634
af66f652
PH
63528. Installed the latest version of exipick from John Jetmore.
636
90af77f4
PH
63729. In an address list, if the pattern was not a regular expression, an empty
638 subject address (from a bounce message) matched only if the pattern was an
639 empty string. Non-empty patterns were not even tested. This was the wrong
640 because it is perfectly reasonable to use an empty address as part of a
641 database query. An empty address is now tested by patterns that are
642 lookups. However, all the other forms of pattern expect the subject to
643 contain a local part and a domain, and therefore, for them, an empty
644 address still always fails if the pattern is not itself empty.
645
d8ef3577
PH
64630. Exim went into a mad DNS loop when attempting to do a callout where the
647 host was specified on an smtp transport, and looking it up yielded more
648 than one IP address.
649
5cb8cbc6
PH
65031. Re-factored the code for checking spool and log partition space into a
651 function that finds that data and another that does the check. The former
652 is then used to implement four new variables: $spool_space, $log_space,
653 $spool_inodes, and $log_inodes.
654
14702f5b
PH
65532. The RFC2047 encoding function was originally intended for short strings
656 such as real names; it was not keeping to the 75-character limit for
657 encoded words that the RFC imposes. It now respects the limit, and
658 generates multiple encoded words if necessary. To be on the safe side, I
659 have increased the buffer size for the ${rfc2047: expansion operator from
660 1024 to 2048 bytes.
661
063b1e99
PH
66233. It is now permitted to omit both strings after an "if" condition; if the
663 condition is true, the result is "true". As before, when the second string
664 is omitted, a false condition yields an empty string. This makes it less
665 cumbersome to write custom ACL and router conditions.
666
652e1b65
PH
66734. Failure to deliver a bounce message always caused it to be frozen, even if
668 there was an errors_to setting on the router. The errors_to setting is now
669 respected.
670
6f0c9a4f
PH
67135. If an IPv6 address is given for -bh or -bhc, it is now converted to the
672 canonical form (fully expanded) before being placed in
673 $sender_host_address.
674
33397d19
PH
67536. The table in the code that translates DNS record types into text (T_A to
676 "A" for instance) was missing entries for NS and CNAME. It is just possible
677 that this could have caused confusion if both these types were looked up
678 for the same domain, because the text type is used as part of Exim's
679 per-process caching. But the chance of anyone hitting this buglet seems
680 very small.
681
7bb56e1f
PH
68237. The dnsdb lookup has been extended in a number of ways.
683
684 (1) There is a new type, "zns", which walks up the domain tree until it
685 finds some nameserver records. It should be used with care.
686
ea3bc19b
PH
687 (2) There is a new type, "mxh", which is like "mx" except that it returns
688 just the host names, not the priorities.
689
690 (3) It is now possible to give a list of domains (or IP addresses) to be
ff4dbb19
PH
691 looked up. The behaviour when one of the lookups defers can be
692 controlled by a keyword.
7bb56e1f 693
ea3bc19b 694 (4) It is now possible to specify the separator character for use when
7bb56e1f 695 multiple records are returned.
33397d19 696
0bcb2a0e
PH
69738. The dnslists ACL condition has been extended: it is now possible to supply
698 a list of IP addresses and/or domains to be looked up in a particular DNS
699 domain.
700
2ac0e484
PH
70139. Added log_selector=+queue_time_overall.
702
4e1fde53
PH
70340. When running the queue in the test harness, wait just a tad after forking a
704 delivery process, to get repeatability of debugging output.
705
de365ded
PH
70641. Include certificate and key file names in error message when GnuTLS fails
707 to set them up, because the GnuTLS error message doesn't include the name
708 of the failing file when there is a problem reading it.
709
f05da2e8
PH
71042. Allow both -bf and -bF in the same test run.
711
d6453af2
PH
71243. Did the same fix as 41 above for OpenSSL, which had the same infelicity.
713
f7b63901
PH
71444. The "Exiscan patch" is now merged into the mainline Exim source.
715
71645. Sometimes the final signoff response after QUIT could fail to get
717 transmitted in the non-TLS case. Testing !tls_active instead of tls_active
718 < 0 before doing a fflush(). This bug looks as though it goes back to the
719 introduction of TLS in release 3.20, but "sometimes" must have been rare
720 because the tests only now provoked it.
721
a444213a
PH
72246. Reset the locale to "C" after calling embedded Perl, in case it was changed
723 (this can affect the format of dates).
724
0ec020ea
PH
72547. exim_tidydb, when checking for the continued existence of a message for
726 which it has found a message-specific retry record, was not finding
727 messages that were in split spool directories. Consequently, it was
728 deleting retry records that should have stayed in existence.
729
b1206957
PH
73048. Steve fixed some bugs in eximstats.
731
73249. The SPA authentication driver was not abandoning authentication and moving
733 on to the next authenticator when an expansion was forced to fail,
734 contradicting the general specification for all authenticators. Instead it
735 was generating a temporary error. It now behaves as specified.
736
26dd5a95
PH
73750. The default ordering of permitted cipher suites for GnuTLS was pessimal
738 (the order specifies the preference for clients). The order is now AES256,
739 AES128, 3DES, ARCFOUR128.
740
343b2385
PH
74151. Small patch to Sieve code - explicitly set From: when generating an
742 autoreply.
743
1c5466b9
PH
74452. Exim crashed if a remote delivery caused a very long error message to be
745 recorded - for instance if somebody sent an entire SpamAssassin report back
746 as a large number of 550 error lines. This bug was coincidentally fixed by
747 increasing the size of one of Exim's internal buffers (big_buffer) that
748 happened as part of the Exiscan merge. However, to be on the safe side, I
749 have made the code more robust (and fixed the comments that describe what
750 is going on).
751
55ee9ee3
PH
75253. Now that there can be additional text after "Completed" in log lines (if
753 the queue_time_overall log selector is set), a one-byte patch to exigrep
754 was needed to allow it to recognize "Completed" as not the last thing in
755 the line.
756
d38f8232
PH
75754. The LDAP lookup was not handling a return of LDAP_RES_SEARCH_REFERENCE. A
758 patch that reportedly fixes this has been added. I am not expert enough to
759 create a test for it. This is what the patch creator wrote:
760
761 "I found a little strange behaviour of ldap code when working with
762 Windows 2003 AD Domain, where users was placed in more than one
763 Organization Units. When I tried to give exim partial DN, the exit code
764 of ldap_search was unknown to exim because of LDAP_RES_SEARCH_REFERENCE.
765 But simultaneously result of request was absolutely normal ldap result,
766 so I produce this patch..."
767
3295e65b
PH
768 Later: it seems that not all versions of LDAP support LDAP_RES_SEARCH_
769 REFERENCE, so I have modified the code to exclude the patch when that macro
770 is not defined.
771
7102e136
PH
77255. Some experimental protocols are using DNS PTR records for new purposes. The
773 keys for these records are domain names, not reversed IP addresses. The
b975ba52
PH
774 dnsdb PTR lookup now tests whether its key is an IP address. If not, it
775 leaves it alone. Component reversal etc. now happens only for IP addresses.
ea3a6f44 776 CAN-2005-0021
7102e136 777
3ca0ba97
PH
77856. Improve error message when ldap_search() fails in OpenLDAP or Solaris LDAP.
779
c2bcbe20
PH
78057. Double the size of the debug message buffer (to 2048) so that more of very
781 long debug lines gets shown.
782
18ce445d
PH
78358. The exicyclog utility now does better if the number of log files to keep
784 exceeds 99. In this case, it numbers them 001, 002 ... instead of 01, 02...
785
1f5b4c3d
PH
78659. Two changes related to the smtp_active_hostname option:
787
788 (1) $smtp_active_hostname is now available as a variable.
789 (2) The default for smtp_banner uses $smtp_active_hostname instead
790 of $primary_hostname.
791
b975ba52
PH
79260. The host_aton() function is supposed to be passed a string that is known
793 to be a valid IP address. However, in the case of IPv6 addresses, it was
794 not checking this. This is a hostage to fortune. Exim now panics and dies
795 if the condition is not met. A case was found where this could be provoked
85b87bc2
PH
796 from a dnsdb PTR lookup with an IPv6 address that had more than 8
797 components; fortuitously, this particular loophole had already been fixed
798 by change 4.50/55 above.
799
800 If there are any other similar loopholes, the new check in host_aton()
801 itself should stop them being exploited. The report I received stated that
802 data on the command line could provoke the exploit when Exim was running as
803 exim, but did not say which command line option was involved. All I could
804 find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
805 running as the user.
ea3a6f44 806 CAN-2005-0021
85b87bc2
PH
807
80861. There was a buffer overflow vulnerability in the SPA authentication code
809 (which came originally from the Samba project). I have added a test to the
810 spa_base64_to_bits() function which I hope fixes it.
ea3a6f44 811 CAN-2005-0022
b975ba52 812
17ffcae7
PH
81362. Configuration update for GNU/Hurd and variations. Updated Makefile-GNU and
814 os.h-GNU, and added configuration files for GNUkFreeBSD and GNUkNetBSD.
815
d95f9fdb
PH
81663. The daemon start-up calls getloadavg() while still root for those OS that
817 need the first call to be done as root, but it missed one case: when
818 deliver_queue_load_max is set with deliver_drop_privilege. This is
819 necessary for the benefit of the queue runner, because there is no re-exec
820 when deliver_drop_privilege is set.
821
86b8287f
PH
82264. A call to exiwhat cut short delays set up by "delay" modifiers in ACLs.
823 This has been fixed.
824
60dc5e56
PH
82565. Caching of lookup data for "hosts =" ACL conditions, when a named host list
826 was in use, was not putting the data itself into the right store pool;
827 consequently, it could be overwritten for a subsequent message in the same
828 SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
829 the caching.)
830
533244af
PH
83166. Added hosts_max_try_hardlimit to the smtp transport, default 50.
832
a5a28604
PH
83367. The string_is_ip_address() function returns 0, 4, or 6, for "no an IP
834 address", "IPv4 address", and "IPv6 address", respectively. Some calls of
835 the function were treating the return as a boolean value, which happened to
836 work because 0=false and not-0=true, but is not correct code.
837
7e634d24
PH
83868. The host_aton() function was not handling scoped IPv6 addresses (those
839 with, for example, "%eth0" on the end) correctly.
840
3e11c26b
PH
84169. Fixed some compiler warnings in acl.c for the bitmaps specified with
842 negated items (that is, ~something) in unsigned ints. Some compilers
843 apparently mutter when there is no cast.
844
6729cf78
PH
84570. If an address verification called from an ACL failed, and did not produce a
846 user-specific message (i.e. there was only a "system" message), nothing was
847 put in $acl_verify_message. In this situation, it now puts the system
848 message there.
849
00f00ca5
PH
85071. Change 4.23/11 added synchronization checking at the start of an SMTP
851 session; change 4.31/43 added the unwanted input to the log line - except
852 that it did not do this in the start of session case. It now does.
853
c9bdd01c
PH
85472. After a timeout in a callout SMTP session, Exim still sent a QUIT command.
855 This is wrong and can cause the other end to generate a synchronization
856 error if it is another Exim or anything else that does the synchronization
857 check. A QUIT command is no longer sent after a timeout.
858
d43194df
PH
85973. $host_lookup_deferred has been added, to make it easier to detect DEFERs
860 during host lookups.
861
fe5b5d0b
PH
86274. The defer_ok option of callout verification was not working if it was used
863 when verifying addresses in header lines, that is, for this case:
864
865 verify = header_sender/callout=defer_ok
866
76a2d7ba
PH
86775. A backgrounded daemon closed stdin/stdout/stderr on entry; this meant that
868 those file descriptors could be used for SMTP connections. If anything
869 wrote to stderr (the example that came up was "warn" in embedded Perl), it
870 could be sent to the SMTP client, causing chaos. The daemon now opens
871 stdin, stdout, and stderr to /dev/null when it puts itself into the
872 background.
873
87476. Arrange for output from Perl's "warn" command to be written to Exim's main
875 log by default. The user can override this with suitable Perl magic.
876
04f7d5b9
PH
87777. The use of log_message on a "discard" ACL verb, which is supposed to add to
878 the log message when discard triggers, was not working for the DATA ACL or
879 for the non-SMTP ACL.
880
bc60667e
PH
88178. Error message wording change in sieve.c.
882
bb6e88ff
PH
88379. If smtp_accept_max_per_host was set, the number of connections could be
884 restricted to fewer than expected, because the daemon was trying to set up
885 a new connection before checking whether the processes handling previous
886 connections had finished. The check for completed processes is now done
887 earlier. On busy systems, this bug wouldn't be noticed because something
888 else would have woken the daemon, and it would have reaped the completed
889 process earlier.
890
1e70f85b
PH
89180. If a message was submitted locally by a user whose login name contained one
892 or more spaces (ugh!), the spool file that Exim wrote was not re-readable.
893 It caused a spool format error. I have fixed the spool reading code. A
894 related problem was that the "from" clause in the Received: line became
895 illegal because of the space(s). It is now covered by ${quote_local_part.
896
89781. Included the latest eximstats from Steve (adds average sizes to HTML Top
898 tables).
899
4e01f9d6
PH
90082. Updated OS/Makefile-AIX as per message from Mike Meredith.
901
1ee1cef2
PH
90283. Patch from Sieve maintainer to fix unterminated string problem in
903 "vacation" handling.
904
6e2b4ccc
PH
90584. Some minor changes to the Linux configuration files to help with other
906 OS variants using glibc.
907
8e669ac1
PH
90885. One more patch for Sieve to update vacation handling to latest spec.
909
495ae4b0 910
bbe902f0
PH
911----------------------------------------------------
912See the note above about the 4.44 and 4.50 releases.
913----------------------------------------------------
914
915
916Exim version 4.44
917-----------------
918
919 1. Change 4.43/35 introduced a bug that caused file counts to be
920 incorrectly computed when quota_filecount was set in an appendfile
921 transport
922
923 2. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
924 bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
925 place.
926
927 3. Give more explanation in the error message when the command for a transport
928 filter fails to execute.
929
930 4. There are several places where Exim runs a non-Exim command in a
931 subprocess. The SIGUSR1 signal should be disabled for these processes. This
932 was being done only for the command run by the queryprogram router. It is
933 now done for all such subprocesses. The other cases are: ${run, transport
934 filters, and the commands run by the lmtp and pipe transports.
935
936 5. Some older OS have a limit of 256 on the maximum number of file
937 descriptors. Exim was using setrlimit() to set 1000 as a large value
938 unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
939 systems. I've change it so that if it can't get 1000, it tries for 256.
940
941 6. "control=submission" was allowed, but had no effect, in a DATA ACL. This
942 was an oversight, and furthermore, ever since the addition of extra
943 controls (e.g. 4.43/32), the checks on when to allow different forms of
944 "control" were broken. There should now be diagnostics for all cases when a
945 control that does not make sense is encountered.
946
947 7. $recipients is now available in the predata ACL (oversight).
948
949 8. Tidy the search cache before the fork to do a delivery from a message
950 received from the command line. Otherwise the child will trigger a lookup
951 failure and thereby defer the delivery if it tries to use (for example) a
952 cached ldap connection that the parent has called unbind on.
953
954 9. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
955 of $address_data from the recipient verification was clobbered by the
956 sender verification.
957
95810. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
959 was its contents. (It was OK if the option was not defined at all.)
960
96111. A "Completed" log line is now written for messages that are removed from
962 the spool by the -Mrm option.
963
96412. $host_address is now set to the target address during the checking of
965 ignore_target_hosts.
966
96713. When checking ignore_target_hosts for an ipliteral router, no host name was
968 being passed; this would have caused $sender_host_name to have been used if
969 matching the list had actually called for a host name (not very likely,
970 since this list is usually IP addresses). A host name is now passed as
971 "[x.x.x.x]".
972
97314. Changed the calls that set up the SIGCHLD handler in the daemon to use the
974 code that specifies a non-restarting handler (typically sigaction() in
975 modern systems) in an attempt to fix a rare and obscure crash bug.
976
97715. Narrowed the window for a race in the daemon that could cause it to ignore
978 SIGCHLD signals. This is not a major problem, because they are used only to
979 wake it up if nothing else does.
980
98116. A malformed maildirsize file could cause Exim to calculate negative values
982 for the mailbox size or file count. Odd effects could occur as a result.
983 The maildirsize information is now recalculated if the size or filecount
984 end up negative.
985
98617. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
987 support for a long time. Removed HAVE_SYS_VFS_H.
988
ea3a6f44 98918. Updated exipick to current release from John Jetmore.
bbe902f0
PH
990
99119. Allow an empty sender to be matched against a lookup in an address list.
992 Previously the only cases considered were a regular expression, or an
993 empty pattern.
994
99520. Exim went into a mad DNS lookup loop when doing a callout where the
996 host was specified on the transport, if the DNS lookup yielded more than
997 one IP address.
998
ea3a6f44
NM
99921. The RFC2047 encoding function was originally intended for short strings
1000 such as real names; it was not keeping to the 75-character limit for
1001 encoded words that the RFC imposes. It now respects the limit, and
1002 generates multiple encoded words if necessary. To be on the safe side, I
1003 have increased the buffer size for the ${rfc2047: expansion operator from
1004 1024 to 2048 bytes.
bbe902f0 1005
ea3a6f44
NM
100622. Failure to deliver a bounce message always caused it to be frozen, even if
1007 there was an errors_to setting on the router. The errors_to setting is now
1008 respected.
bbe902f0
PH
1009
101023. If an IPv6 address is given for -bh or -bhc, it is now converted to the
1011 canonical form (fully expanded) before being placed in
1012 $sender_host_address.
1013
101424. Updated eximstats to version 1.33
1015
ea3a6f44
NM
101625. Include certificate and key file names in error message when GnuTLS fails
1017 to set them up, because the GnuTLS error message doesn't include the name
1018 of the failing file when there is a problem reading it.
bbe902f0
PH
1019
102026. Expand error message when OpenSSL has problems setting up cert/key files.
ea3a6f44 1021 As per change 25.
bbe902f0 1022
ea3a6f44
NM
102327. Reset the locale to "C" after calling embedded Perl, in case it was changed
1024 (this can affect the format of dates).
bbe902f0 1025
ea3a6f44
NM
102628. exim_tidydb, when checking for the continued existence of a message for
1027 which it has found a message-specific retry record, was not finding
1028 messages that were in split spool directories. Consequently, it was
1029 deleting retry records that should have stayed in existence.
bbe902f0
PH
1030
103129. eximstats updated to version 1.35
1032 1.34 - allow eximstats to parse syslog lines as well as mainlog lines
1033 1.35 - bugfix such that pie charts by volume are generated correctly
1034
ea3a6f44
NM
103530. The SPA authentication driver was not abandoning authentication and moving
1036 on to the next authenticator when an expansion was forced to fail,
1037 contradicting the general specification for all authenticators. Instead it
1038 was generating a temporary error. It now behaves as specified.
bbe902f0 1039
ea3a6f44
NM
104031. The default ordering of permitted cipher suites for GnuTLS was pessimal
1041 (the order specifies the preference for clients). The order is now AES256,
1042 AES128, 3DES, ARCFOUR128.
bbe902f0 1043
ea3a6f44
NM
104431. Small patch to Sieve code - explicitly set From: when generating an
1045 autoreply.
bbe902f0 1046
ea3a6f44
NM
104732. Exim crashed if a remote delivery caused a very long error message to be
1048 recorded - for instance if somebody sent an entire SpamAssassin report back
1049 as a large number of 550 error lines. This bug was coincidentally fixed by
1050 increasing the size of one of Exim's internal buffers (big_buffer) that
1051 happened as part of the Exiscan merge. However, to be on the safe side, I
1052 have made the code more robust (and fixed the comments that describe what
1053 is going on).
bbe902f0 1054
ea3a6f44
NM
105533. Some experimental protocols are using DNS PTR records for new purposes. The
1056 keys for these records are domain names, not reversed IP addresses. The
1057 dnsdb PTR lookup now tests whether its key is an IP address. If not, it
1058 leaves it alone. Component reversal etc. now happens only for IP addresses.
bbe902f0
PH
1059 CAN-2005-0021
1060
ea3a6f44
NM
106134. The host_aton() function is supposed to be passed a string that is known
1062 to be a valid IP address. However, in the case of IPv6 addresses, it was
1063 not checking this. This is a hostage to fortune. Exim now panics and dies
1064 if the condition is not met. A case was found where this could be provoked
1065 from a dnsdb PTR lookup with an IPv6 address that had more than 8
1066 components; fortuitously, this particular loophole had already been fixed
1067 by change 4.50/55 or 4.44/33 above.
1068
1069 If there are any other similar loopholes, the new check in host_aton()
1070 itself should stop them being exploited. The report I received stated that
1071 data on the command line could provoke the exploit when Exim was running as
1072 exim, but did not say which command line option was involved. All I could
1073 find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
1074 running as the user.
bbe902f0
PH
1075 CAN-2005-0021
1076
ea3a6f44
NM
107735. There was a buffer overflow vulnerability in the SPA authentication code
1078 (which came originally from the Samba project). I have added a test to the
1079 spa_base64_to_bits() function which I hope fixes it.
bbe902f0
PH
1080 CAN-2005-0022
1081
ea3a6f44
NM
108236. The daemon start-up calls getloadavg() while still root for those OS that
1083 need the first call to be done as root, but it missed one case: when
1084 deliver_queue_load_max is set with deliver_drop_privilege. This is
1085 necessary for the benefit of the queue runner, because there is no re-exec
1086 when deliver_drop_privilege is set.
bbe902f0 1087
ea3a6f44
NM
108837. Caching of lookup data for "hosts =" ACL conditions, when a named host list
1089 was in use, was not putting the data itself into the right store pool;
1090 consequently, it could be overwritten for a subsequent message in the same
1091 SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
1092 the caching.)
bbe902f0 1093
ea3a6f44
NM
109438. Sometimes the final signoff response after QUIT could fail to get
1095 transmitted in the non-TLS case. Testing !tls_active instead of tls_active
1096 < 0 before doing a fflush(). This bug looks as though it goes back to the
1097 introduction of TLS in release 3.20, but "sometimes" must have been rare
1098 because the tests only now provoked it.
bbe902f0
PH
1099
1100
495ae4b0
PH
1101Exim version 4.43
1102-----------------
1103
1104 1. Fixed a longstanding but relatively impotent bug: a long time ago, before
1105 PIPELINING, the function smtp_write_command() used to return TRUE or FALSE.
1106 Now it returns an integer. A number of calls were still expecting a T/F
1107 return. Fortuitously, in all cases, the tests worked in OK situations,
1108 which is the norm. However, things would have gone wrong on any write
1109 failures on the smtp file descriptor. This function is used when sending
1110 messages over SMTP and also when doing verify callouts.
1111
1112 2. When Exim is called to do synchronous delivery of a locally submitted
1113 message (the -odf or -odi options), it no longer closes stderr before doing
1114 the delivery.
1115
1116 3. Implemented the mua_wrapper option.
1117
1118 4. Implemented mx_fail_domains and srv_fail_domains for the dnslookup router.
1119
1120 5. Implemented the functions header_remove(), header_testname(),
1121 header_add_at_position(), and receive_remove_recipient(), and exported them
1122 to local_scan().
1123
1124 6. If an ACL "warn" statement specified the addition of headers, Exim already
1125 inserted X-ACL-Warn: at the start if there was no header name. However, it
1126 was not making this test for the second and subsequent header lines if
1127 there were newlines in the string. This meant that an invalid header could
1128 be inserted if Exim was badly configured.
1129
1130 7. Allow an ACL "warn" statement to add header lines at the start or after all
1131 the Received: headers, as well as at the end.
1132
1133 8. Added the rcpt_4xx retry error code.
1134
1135 9. Added postmaster_mailfrom=xxx to callout verification option.
1136
113710. Added mailfrom=xxxx to the callout verification option, for verify=
1138 header_sender only.
1139
114011. ${substr_1_:xxxx} and ${substr__3:xxxx} are now diagnosed as syntax errors
1141 (they previously behaved as ${substr_1_0:xxxx} and ${substr:_0_3:xxxx}).
1142
114312. Inserted some casts to stop certain compilers warning when using pointer
1144 differences as field lengths or precisions in printf-type calls (mostly
1145 affecting debugging statements).
1146
114713. Added optional readline() support for -be (dynamically loaded).
1148
114914. Obscure bug fix: if a message error (e.g. 4xx to MAIL) happened within the
1150 same clock tick as a message's arrival, so that its received time was the
1151 same as the "first fail" time on the retry record, and that message
1152 remained on the queue past the ultimate address timeout, every queue runner
1153 would try a delivery (because it was past the ultimate address timeout) but
1154 after another failure, the ultimate address timeout, which should have then
1155 bounced the address, did not kick in. This was a "< instead of <=" error;
1156 in most cases the first failure would have been in the next clock tick
1157 after the received time, and all would be well.
1158
115915. The special items beginning with @ in domain lists (e.g. @mx_any) were not
1160 being recognized when the domain list was tested by the match_domain
1161 condition in an expansion string.
1162
116316. Added the ${str2b64: operator.
1164
116517. Exim was always calling setrlimit() to set a large limit for the number of
1166 processes, without checking whether the existing limit was already
1167 adequate. (It did check for the limit on file descriptors.) Furthermore,
1168 errors from getrlimit() and setrlimit() were being ignored. Now they are
1169 logged to the main and panic logs, but Exim does carry on, to try to do its
1170 job under whatever limits there are.
1171
117218. Imported PCRE 5.0.
1173
117419. Trivial typo in log message " temporarily refused connection" (the leading
1175 space).
1176
117720. If the log selector return_path_on_delivery was set and an address was
1178 redirected to /dev/null, the delivery process crashed because it assumed
1179 that a return path would always be set for a "successful" delivery. In this
1180 case, the whole delivery is bypassed as an optimization, and therefore no
1181 return path is set.
1182
118321. Internal re-arrangement: the function for sending a challenge and reading
1184 a response while authentication was assuming a zero-terminated challenge
1185 string. It's now changed to take a pointer and a length, to allow for
1186 binary data in such strings.
1187
118822. Added the cyrus_sasl authenticator (code supplied by MBM).
1189
119023. Exim was not respecting finduser_retries when seeking the login of the
1191 uid under which it was called; it was always trying 10 times. (The default
1192 setting of finduser_retries is zero.) Also, it was sleeping after the final
1193 failure, which is pointless.
1194
119524. Implemented tls_on_connect_ports.
1196
119725. Implemented acl_smtp_predata.
1198
119926. If the domain in control=submission is set empty, Exim assumes that the
1200 authenticated id is a complete email address when it generates From: or
1201 Sender: header lines.
1202
120327. Added "#define SOCKLEN_T int" to OS/os.h-SCO and OS/os.h-SCO_SV. Also added
1204 definitions to OS/Makefile-SCO and OS/Makefile-SCO_SV that put basename,
1205 chown and chgrp in /bin and hostname in /usr/bin.
1206
120728. Exim was keeping the "process log" file open after each use, just as it
1208 does for the main log. This opens the possibility of it remaining open for
1209 long periods when the USR1 signal hits a daemon. Occasional processlog
1210 errors were reported, that could have been caused by this. Anyway, it seems
1211 much more sensible not to leave this file open at all, so that is what now
1212 happens.
1213
121429. The long-running daemon process does not normally write to the log once it
1215 has entered its main loop, and it closes the log before doing so. This is
1216 so that log files can straightforwardly be renamed and moved. However,
1217 there are a couple of unusual error situations where the daemon does write
1218 log entries, and I had neglected to close the log afterwards.
1219
122030. The text of an SMTP error response that was received during a remote
1221 delivery was being truncated at 512 bytes. This is too short for some of
1222 the long messages that one sometimes sees. I've increased the limit to
1223 1024.
1224
122531. It is now possible to make retry rules that apply only when a message has a
1226 specific sender, in particular, an empty sender.
1227
122832. Added "control = enforce_sync" and "control = no_enforce_sync". This makes
1229 it possible to be selective about when SMTP synchronization is enforced.
1230
123133. Added "control = caseful_local_part" and "control = "caselower_local_part".
1232
123332. Implemented hosts_connection_nolog.
1234
123533. Added an ACL for QUIT.
1236
123734. Setting "delay_warning=" to disable warnings was not working; it gave a
1238 syntax error.
1239
124035. Added mailbox_size and mailbox_filecount to appendfile.
1241
124236. Added control = no_multiline_responses to ACLs.
1243
124437. There was a bug in the logic of the code that waits for the clock to tick
1245 in the case where the clock went backwards by a substantial amount such
1246 that the microsecond fraction of "now" was more than the microsecond
1247 fraction of "then" (but the whole seconds number was less).
1248
124938. Added support for the libradius Radius client library this is found on
1250 FreeBSD (previously only the radiusclient library was supported).
1251
1252
1253Exim version 4.42
1254-----------------
1255
1256 1. When certain lookups returned multiple values in the form name=value, the
1257 quoting of the values was not always being done properly. Specifically:
1258 (a) If the value started with a double quote, but contained no whitespace,
1259 it was not quoted.
1260 (b) If the value contained whitespace other than a space character (i.e.
1261 tabs or newlines or carriage returns) it was not quoted.
1262 This fix has been applied to the mysql and pgsql lookups by writing a
1263 separate quoting function and calling it from the lookup code. The fix
1264 should probably also be applied to nisplus, ibase and oracle lookups, but
1265 since I cannot test any of those, I have not disturbed their existing code.
1266
1267 2. A hit in the callout cache for a specific address caused a log line with no
1268 reason for rejecting RCPT. Now it says "Previous (cached) callout
1269 verification failure".
1270
1271 3. There was an off-by-one bug in the queryprogram router. An over-long
1272 return line was truncated at 256 instead of 255 characters, thereby
1273 overflowing its buffer with the terminating zero. As well as fixing this, I
1274 have increased the buffer size to 1024 (and made a note to document this).
1275
1276 4. If an interrupt, such as the USR1 signal that is send by exiwhat, arrives
1277 when Exim is waiting for an SMTP response from a remote server, Exim
1278 restarts its select() call on the socket, thereby resetting its timeout.
1279 This is not a problem when such interrupts are rare. Somebody set up a cron
1280 job to run exiwhat every 2 minutes, which is less than the normal select()
1281 timeout (5 or 10 minutes). This meant that the select() timeout never
1282 kicked in because it was always reset. I have fixed this by comparing the
1283 time when an interrupt arrives with the time at the start of the first call
1284 to select(). If more time than the timeout has elapsed, the interrupt is
1285 treated as a timeout.
1286
1287 5. Some internal re-factoring in preparation for the addition of Sieve
1288 extensions (by MH). In particular, the "personal" test is moved to a
1289 separate function, and given an option for scanning Cc: and Bcc: (which is
1290 not set for Exim filters).
1291
1292 6. When Exim created an email address using the login of the caller as the
1293 local part (e.g. when creating a From: or Sender: header line), it was not
1294 quoting the local part when it contained special characters such as @.
1295
1296 7. Installed new OpenBSD configuration files.
1297
1298 8. Reworded some messages for syntax errors in "and" and "or" conditions to
1299 try to make them clearer.
1300
1301 9. Callout options, other than the timeout value, were being ignored when
1302 verifying sender addresses in header lines. For example, when using
1303
1304 verify = header_sender/callout=no_cache
1305
1306 the cache was (incorrectly) being used.
1307
130810. Added a missing instance of ${EXE} to the exim_install script; this affects
1309 only the Cygwin environment.
1310
131111. When return_path_on_delivery was set as a log selector, if different remote
1312 addresses in the same message used different return paths and parallel
1313 remote delivery occurred, the wrong values would sometimes be logged.
1314 (Whenever a remote delivery process finished, the return path value from
1315 the most recently started remote delivery process was logged.)
1316
131712. RFC 3848 specifies standard names for the "with" phrase in Received: header
1318 lines when AUTH and/or TLS are in use. This is the "received protocol"
1319 field. Exim used to use "asmtp" for authenticated SMTP, without any
1320 indication (in the protocol name) for TLS use. Now it follows the RFC and
1321 uses "esmtpa" if the connection is authenticated, "esmtps" if it is
1322 encrypted, and "esmtpsa" if it is both encrypted and authenticated. These
1323 names appear in log lines as well as in Received: header lines.
1324
132513. Installed MH's patches for Sieve to add the "copy" and "vacation"
1326 extensions, and comparison tests, and to fix some bugs.
1327
132814. Changes to the "personal" filter test:
1329
1330 (1) The test was buggy in that it was just doing the equivalent of
1331 "contains" tests on header lines. For example, if a user's address was
1332 anne@some.where, the "personal" test would incorrectly be true for
1333
1334 To: susanne@some.where
1335
1336 This test is now done by extracting each address from the header in turn,
1337 and checking the entire address. Other tests that are part of "personal"
1338 are now done using regular expressions (for example, to check local parts
1339 of addresses in From: header lines).
1340
1341 (2) The list of non-personal local parts in From: addresses has been
1342 extended to include "listserv", "majordomo", "*-request", and "owner-*",
1343 taken from the Sieve specification recommendations.
1344
1345 (3) If the message contains any header line starting with "List-" it is
1346 treated as non-personal.
1347
1348 (4) The test for "circular" in the Subject: header line has been removed
1349 because it now seems ill-conceived.
1350
135115. Minor typos in src/EDITME comments corrected.
1352
135316. Installed latest exipick from John Jetmore.
1354
135517. If headers_add on a router specified a text string that was too long for
1356 string_sprintf() - that is, longer than 8192 bytes - Exim panicked. The use
1357 of string_sprintf() is now avoided.
1358
135918. $message_body_size was not set (it was always zero) when running the DATA
1360 ACL and the local_scan() function.
1361
136219. For the "mail" command in an Exim filter, no default was being set for
1363 the once_repeat time, causing a random time value to be used if "once" was
1364 specified. (If the value happened to be <= 0, no repeat happened.) The
1365 default is now 0s, meaning "never repeat". The "vacation" command was OK
1366 (its default is 7d). It's somewhat surprising nobody ever noticed this bug
1367 (I found it when inspecting the code).
1368
136920. There is now an overall timeout for performing a callout verification. It
1370 defaults to 4 times the callout timeout, which applies to individual SMTP
1371 commands during the callout. The overall timeout applies when there is more
1372 than one host that can be tried. The timeout is checked before trying the
1373 next host. This prevents very long delays if there are a large number of
1374 hosts and all are timing out (e.g. when the network connections are timing
1375 out). The value of the overall timeout can be changed by specifying an
1376 additional sub-option for "callout", called "maxwait". For example:
1377
1378 verify = sender/callout=5s,maxwait=20s
1379
138021. Add O_APPEND to the open() call for maildirsize files (Exim already seeks
1381 to the end before writing, but this should make it even safer).
1382
138322. Exim was forgetting that it had advertised PIPELINING for the second and
1384 subsequent messages on an SMTP connection. It was also not resetting its
1385 memory on STARTTLS and an internal HELO.
1386
138723. When Exim logs an SMTP synchronization error within a session, it now
1388 records whether PIPELINING has been advertised or not.
1389
139024. Added 3 instances of "(long int)" casts to time_t variables that were being
1391 formatted using %ld, because on OpenBSD (and perhaps others), time_t is int
1392 rather than long int.
1393
139425. Installed the latest Cygwin configuration files from the Cygwin maintainer.
1395
139626. Added the never_mail option to autoreply.
1397
1398
1399Exim version 4.41
1400-----------------
1401
1402 1. A reorganization of the code in order to implement 4.40/8 caused a daemon
1403 crash if the getsockname() call failed; this can happen if a connection is
1404 closed very soon after it is established. The problem was simply in the
1405 order in which certain operations were done, causing Exim to try to write
1406 to the SMTP stream before it had set up the file descriptor. The bug has
1407 been fixed by making things happen in the correct order.
1408
1409
1410Exim version 4.40
1411-----------------
1412
1413 1. If "drop" was used in a DATA ACL, the SMTP output buffer was not flushed
1414 before the connection was closed, thus losing the rejection response.
1415
1416 2. Commented out the definition of SOCKLEN_T in os.h-SunOS5. It is needed for
1417 some early Solaris releases, but causes trouble in current releases where
1418 socklen_t is defined.
1419
1420 3. When std{in,out,err} are closed, re-open them to /dev/null so that they
1421 always exist.
1422
1423 4. Minor refactoring of os.c-Linux to avoid compiler warning when IPv6 is not
1424 configured.
1425
1426 5. Refactoring in expand.c to improve memory usage. Pre-allocate a block so
1427 that releasing the top of it at the end releases what was used for sub-
1428 expansions (unless the block got too big). However, discard this block if
1429 the first thing is a variable or header, so that we can use its block when
1430 it is dynamic (useful for very large $message_headers, for example).
1431
1432 6. Lookups now cache *every* query, not just the most recent. A new, separate
1433 store pool is used for this. It can be recovered when all lookup caches are
1434 flushed. Lookups now release memory at the end of their result strings.
1435 This has involved some general refactoring of the lookup sources.
1436
1437 7. Some code has been added to the store_xxx() functions to reduce the amount
1438 of flapping under certain conditions.
1439
1440 8. log_incoming_interface used to affect only the <= reception log lines. Now
1441 it causes the local interface and port to be added to several more SMTP log
1442 lines, for example "SMTP connection from", and rejection lines.
1443
1444 9. The Sieve author supplied some patches for the doc/README.SIEVE file.
1445
144610. Added a conditional definition of _BSD_SOCKLEN_T to os.h-Darwin.
1447
144811. If $host_data was set by virtue of a hosts lookup in an ACL, its value
1449 could be overwritten at the end of the current message (or the start of a
1450 new message if it was set in a HELO ACL). The value is now preserved for
1451 the duration of the SMTP connection.
1452
145312. If a transport had a headers_rewrite setting, and a matching header line
1454 contained an unqualified address, that address was qualified, even if it
1455 did not match any rewriting rules. The underlying bug was that the values
1456 of the flags that permit the existence of unqualified sender and recipient
1457 addresses in header lines (set by {sender,recipient}_unqualified_hosts for
1458 non-local messages, and by -bnq for local messages) were not being
1459 preserved with the message after it was received.
1460
146113. When Exim was logging an SMTP synchronization error, it could sometimes log
1462 "next input=" as part of the text comprising the host identity instead of
1463 the correct text. The code was using the same buffer for two different
1464 strings. However, depending on which order the printing function evaluated
1465 its arguments, the bug did not always show up. Under Linux, for example, my
1466 test suite worked just fine.
1467
146814. Exigrep contained a use of Perl's "our" scoping after change 4.31/70. This
1469 doesn't work with some older versions of Perl. It has been changed to "my",
1470 which in any case is probably the better facility to use.
1471
147215. A really picky compiler found some instances of statements for creating
1473 error messages that either had too many or two few arguments for the format
1474 string.
1475
147616. The size of the buffer for calls to the DNS resolver has been increased
1477 from 1024 to 2048. A larger buffer is needed when performing PTR lookups
1478 for addresses that have a lot of PTR records. This alleviates a problem; it
1479 does not fully solve it.
1480
148117. A dnsdb lookup for PTR records that receives more data than will fit in the
1482 buffer now truncates the list and logs the incident, which is the same
1483 action as happens when Exim is looking up a host name and its aliases.
1484 Previously in this situation something unpredictable would happen;
1485 sometimes it was "internal error: store_reset failed".
1486
148718. If a server dropped the connection unexpectedly when an Exim client was
1488 using GnuTLS and trying to read a response, the client delivery process
1489 crashed while trying to generate an error log message.
1490
149119. If a "warn" verb in an ACL added multiple headers to a message in a single
1492 string, for example:
1493
1494 warn message = H1: something\nH2: something
1495
1496 the text was added as a single header line from Exim's point of view
1497 though it ended up OK in the delivered message. However, searching for the
1498 second and subsequent header lines using $h_h2: did not work. This has been
1499 fixed. Similarly, if a system filter added multiple headers in this way,
1500 the routers could not see them.
1501
150220. Expanded the error message when iplsearch is called with an invalid key to
1503 suggest using net-iplsearch in a host list.
1504
150521. When running tests using -bh, any delays imposed by "delay" modifiers in
1506 ACLs are no longer actually imposed (and a message to that effect is
1507 output).
1508
150922. If a "gecos" field in a passwd entry contained escaped characters, in
1510 particular, if it contained a \" sequence, Exim got it wrong when building
1511 a From: or a Sender: header from that name. A second bug also caused
1512 incorrect handling when an unquoted " was present following a character
1513 that needed quoting.
1514
151523. "{crypt}" as a password encryption mechanism for a "crypteq" expansion item
1516 was not being matched caselessly.
1517
151824. Arranged for all hyphens in the exim.8 source to be escaped with
1519 backslashes.
1520
152125. Change 16 of 4.32, which reversed 71 or 4.31 didn't quite do the job
1522 properly. Recipient callout cache records were still being keyed to include
1523 the sender, even when use_sender was set false. This led to far more
1524 callouts that were necessary. The sender is no longer included in the key
1525 when use_sender is false.
1526
152726. Added "control = submission" modifier to ACLs.
1528
152927. Added the ${base62d: operator to decode base 62 numbers.
1530
153128. dnsdb lookups can now access SRV records.
1532
153329. CONFIGURE_OWNER can be set at build time to define an alternative owner for
1534 the configuration file.
1535
153630. The debug message "delivering xxxxxx-xxxxxx-xx" is now output in verbose
1537 (-v) mode. This makes the output for a verbose queue run more intelligible.
1538
153931. Added a use_postmaster feature to recipient callouts.
1540
154132. Added the $body_zerocount variable, containing the number of binary zero
1542 bytes in the message body.
1543
154433. The time of last modification of the "new" subdirectory is now used as the
1545 "mailbox time last read" when there is a quota error for a maildir
1546 delivery.
1547
154834. Added string comparison operators lt, lti, le, lei, gt, gti, ge, gei.
1549
155035. Added +ignore_unknown as a special item in host lists.
1551
155236. Code for decoding IPv6 addresses in host lists is now included, even if
1553 IPv6 support is not being compiled. This fixes a bug in which an IPv6
1554 address was recognized as an IP address, but was then not correctly decoded
1555 into binary, causing unexpected and incorrect effects when compared with
1556 another IP address.
1557
1558
1559Exim version 4.34
1560-----------------
1561
1562 1. Very minor rewording of debugging text in manualroute to say "list of
1563 hosts" instead of "hostlist".
1564
1565 2. If verify=header_syntax was set, and a header line with an unqualified
1566 address (no domain) and a large number of spaces between the end of the
1567 name and the colon was received, the reception process suffered a buffer
1568 overflow, and (when I tested it) crashed. This was caused by some obsolete
1569 code that should have been removed. The fix is to remove it!
1570
1571 3. When running in the test harness, delay a bit after writing a bounce
1572 message to get a bit more predictability in the log output.
1573
1574 4. Added a call to search_tidyup() just before forking a reception process. In
1575 theory, someone could use a lookup in the expansion of smtp_accept_max_
1576 per_host which, without the tidyup, could leave open a database connection.
1577
1578 5. Added the variables $recipient_data and $sender_data which get set from a
1579 lookup success in an ACL "recipients" or "senders" condition, or a router
1580 "senders" option, similar to $domain_data and $local_part_data.
1581
1582 6. Moved the writing of debug_print from before to after the "senders" test
1583 for routers.
1584
1585 7. Change 4.31/66 (moving the time when the Received: is generated) caused
1586 problems for message scanning, either using a data ACL, or using
1587 local_scan() because the Received: header was not generated till after they
1588 were called (in order to set the time as the time of reception completion).
1589 I have revised the way this works. The header is now generated after the
1590 body is received, but before the ACL or local_scan() are called. After they
1591 are run, the timestamp in the header is updated.
1592
1593
1594Exim version 4.33
1595-----------------
1596
1597 1. Change 4.24/6 introduced a bug because the SIGALRM handler was disabled
1598 before starting a queue runner without re-exec. This happened only when
1599 deliver_drop_privilege was set or when the Exim user was set to root. The
1600 effect of the bug was that timeouts during subsequent deliveries caused
1601 crashes instead of being properly handled. The handler is now left at its
1602 default (and expected) setting.
1603
1604 2. The other case in which a daemon avoids a re-exec is to deliver an incoming
1605 message, again when deliver_drop_privilege is set or Exim is run as root.
1606 The bug described in (1) was not present in this case, but the tidying up
1607 of the other signals was missing. I have made the two cases consistent.
1608
1609 3. The ignore_target_hosts setting on a manualroute router was being ignored
1610 for hosts that were looked up using the /MX notation.
1611
1612 4. Added /ignore=<ip list> feature to @mx_any, @mx_primary, and @mx_secondary
1613 in domain lists.
1614
1615 5. Change 4.31/55 was buggy, and broke when there was a rewriting rule that
1616 operated on the sender address. After changing the $sender_address to <>
1617 for the sender address verify, Exim was re-instated it as the original
1618 (before rewriting) address, but remembering that it had rewritten it, so it
1619 wasn't rewriting it again. This bug also had the effect of breaking the
1620 sender address verification caching when the sender address was rewritten.
1621
1622 6. The ignore_target_hosts option was being ignored by the ipliteral router.
1623 This has been changed so that if the ip literal address matches
1624 ignore_target_hosts, the router declines.
1625
1626 7. Added expansion conditions match_domain, match_address, and match_local_
1627 part (NOT match_host).
1628
1629 8. The placeholder for the Received: header didn't have a length field set.
1630
1631 9. Added code to Exim itself and to exim_lock to test for a specific race
1632 condition that could lead to file corruption when using MBX delivery. The
1633 issue is with the lockfile that is created in /tmp. If this file is removed
1634 after a process has opened it but before that process has acquired a lock,
1635 there is the potential for a second process to recreate the file and also
1636 acquire a lock. This could lead to two Exim processes writing to the file
1637 at the same time. The added code performs the same test as UW imapd; it
1638 checks after acquiring the lock that its file descriptor still refers to
1639 the same named file.
1640
164110. The buffer for building added header lines was of fixed size, 8192 bytes.
1642 It is now parameterized by HEADER_ADD_BUFFER_SIZE and this can be adjusted
1643 when Exim is built.
1644
164511. Added the smtp_active_hostname option. If used, this will typically be made
1646 to depend on the incoming interface address. Because $interface_address is
1647 not set up until the daemon has forked a reception process, error responses
1648 that can happen earlier (such as "too many connections") no longer contain
1649 a host name.
1650
165112. If an expansion in a condition on a "warn" statement fails because a lookup
1652 defers, the "warn" statement is abandoned, and the next ACL statement is
1653 processed. Previously this caused the whole ACL to be aborted.
1654
165513. Added the iplsearch lookup type.
1656
165714. Added ident_timeout as a log selector.
1658
165915. Added tls_certificate_verified as a log selector.
1660
166116. Added a global option tls_require_ciphers (compare the smtp transport
1662 option of the same name). This controls incoming TLS connections.
1663
166417. I finally figured out how to make tls_require_ciphers do a similar thing
1665 in GNUtls to what it does in OpenSSL, that is, set up an appropriate list
1666 before starting the TLS session.
1667
166818. Tabs are now shown as \t in -bP output.
1669
167019. If the log selector return_path_on_delivery was set, Exim crashed when
1671 bouncing a message because it had too many Received: header lines.
1672
167320. If two routers both had headers_remove settings, and the first one included
1674 a superfluous trailing colon, the final name in the first list and the
1675 first name in the second list were incorrectly joined into one item (with a
1676 colon in the middle).
1677
1678
1679Exim version 4.32
1680-----------------
1681
1682 1. Added -C and -D options to the exinext utility, mainly to make it easier
1683 to include in the automated testing, but these could be helpful when
1684 multiple configurations are in use.
1685
1686 2. The exinext utility was not formatting the output nicely when there was
1687 an alternate port involved in the retry record key, nor when there was a
1688 message id as well (for retries that were specific to a specific message
1689 and a specific host). It was also confused by IPv6 addresses, because of
1690 the additional colons they contain. I have fixed the IPv4 problem, and
1691 patched it up to do a reasonable job for IPv6.
1692
1693 3. When there is an error after a MAIL, RCPT, or DATA SMTP command during
1694 delivery, the log line now contains "pipelined" if PIPELINING was used.
1695
1696 4. An SMTP transport process used to panic and die if the bind() call to set
1697 an explicit outgoing interface failed. This has been changed; it is now
1698 treated in the same way as a connect() failure.
1699
1700 5. A reference to $sender_host_name in the part of a conditional expansion
1701 that was being skipped was still causing a DNS lookup. This no longer
1702 occurs.
1703
1704 6. The def: expansion condition was not recognizing references to header lines
1705 that used bh_ and bheader_.
1706
1707 7. Added the _cache feature to named lists.
1708
1709 8. The code for checking quota_filecount in the appendfile transport was
1710 allowing one more file than it should have been.
1711
1712 9. For compatibility with Sendmail, the command line option
1713
1714 -prval:sval
1715
1716 is equivalent to
1717
1718 -oMr rval -oMs sval
1719
1720 and sets the incoming protocol and host name (for trusted callers). The
1721 host name and its colon can be omitted when only the protocol is to be set.
1722 Note the Exim already has two private options, -pd and -ps, that refer to
1723 embedded Perl. It is therefore impossible to set a protocol value of "d" or
1724 "s", but I don't think that's a major issue.
1725
172610. A number of refactoring changes to the code, none of which should affect
1727 Exim's behaviour:
1728
1729 (a) The number of logging options was getting close to filling up the
1730 32-bit word that was used as a bit map. I have split them into two classes:
1731 those that are passed in the argument to log_write(), and those that are
1732 only ever tested independently outside of that function. These are now in
1733 separate 32-bit words, so there is plenty of room for expansion again.
1734 There is no change in the user interface or the logging behaviour.
1735
1736 (b) When building, for example, log lines, the code previously used a
1737 macro that called string_cat() twice, in order to add two strings. This is
1738 not really sufficiently general. Furthermore, there was one instance where
1739 it was actually wrong because one of the argument was used twice, and in
1740 one call a function was used. (As it happened, calling the function twice
1741 did not affect the overall behaviour.) The macro has been replaced by a
1742 function that can join an arbitrary number of extra strings onto a growing
1743 string.
1744
1745 (c) The code for expansion conditions now uses a table and a binary chop
1746 instead of a serial search (which was left over from when there were very
1747 few conditions). Also, it now recognizes conditions like "pam" even when
1748 the relevant support is not compiled in: a suitably worded error message is
1749 given if an attempt is made to use such a condition.
1750
175111. Added ${time_interval:xxxxx}.
1752
175312. A bug was causing one of the ddress fields not to be passed back correctly
1754 from remote delivery subprocesses. The field in question was not being
1755 subsequently used, so this caused to problems in practice.
1756
175713. Added new log selectors queue_time and deliver_time.
1758
175914. Might have fixed a bug in maildirsizefile handling that threw up
1760 "unexpected character" debug warnings, and recalculated the data
1761 unnecessarily. In any case, I expanded the warning message to give more
1762 information.
1763
176415. Added the message "Restricted characters in address" to the statements in
1765 the default ACL that block characters like @ and % in local parts.
1766
176716. Change 71 for release 4.31 proved to be much less benign that I imagined.
1768 Three changes have been made:
1769
1770 (a) There was a serious bug; a negative response to MAIL caused the whole
1771 recipient domain to be cached as invalid, thereby blocking all messages
1772 to all local parts at the same domain, from all senders. This bug has
1773 been fixed. The domain is no longer cached after a negative response to
1774 MAIL if the sender used is not empty.
1775
1776 (b) The default behaviour of using MAIL FROM:<> for recipient callouts has
1777 been restored.
1778
1779 (c) A new callout option, "use_sender" has been added for people who want
1780 the modified behaviour.
1781
1782
1783Exim version 4.31
1784-----------------
1785
1786 1. Removed "EXTRALIBS=-lwrap" from OS/Makefile-Unixware7 on the advice of
1787 Larry Rosenman.
1788
1789 2. Removed "LIBS = -lresolv" from OS/Makefile-Darwin as it is not needed, and
1790 indeed breaks things for older releases.
1791
1792 3. Added additional logging to the case where there is a problem reading data
1793 from a filter that is running in a subprocess using a pipe, in order to
1794 try to track down a specific problem.
1795
1796 4. Testing facility fudge: when running in the test harness and attempting
1797 to connect to 10.x.x.x (expecting a connection timeout) I'm now sometimes
1798 getting "No route to host". Convert this to a timeout.
1799
1800 5. Define ICONV_ARG2_TYPE as "char **" for Unixware7 to avoid compiler
1801 warning.
1802
1803 6. Some OS don't have socklen_t but use size_t instead. This affects the
1804 fifth argument of getsockopt() amongst other things. This is now
1805 configurable by a macro called SOCKLEN_T which defaults to socklen_t, but
1806 can be set for individual OS. I have set it for SunOS5, OSF1, and
1807 Unixware7. Current versions of SunOS5 (aka Solaris) do have socklen_t, but
1808 some earlier ones do not.
1809
1810 7. Change 4.30/15 was not doing the test caselessly.
1811
1812 8. The standard form for an IPv6 address literal was being rejected by address
1813 parsing in, for example, MAIL and RCPT commands. An example of this kind of
1814 address is [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
1815 this, as well as the form without the "IPv6" on the front (but only when
1816 address literals are enabled, of course).
1817
1818 9. Added some casts to avoid compiler warnings in OS/os.c-Linux.
1819
182010. Exim crashed if a message with an empty sender address specified by -f
1821 encountered a router with an errors_to setting. This could be provoked only
1822 by a command such as
1823
1824 exim -f "" ...
1825
1826 where an empty string was supplied; "<>" did not hit this bug.
1827
182811. Installed PCRE release 4.5.
1829
183012. If EHLO/HELO was rejected by an ACL, the value of $sender_helo_name
1831 remained set. It is now erased.
1832
183313. exiqgrep wasn't working on MacOS X because it didn't correctly compute
1834 times from message ids (which are base 36 rather than the normal 62).
1835
183614. "Expected" SMTP protocol errors that can arise when PIPELINING is in use
1837 were being counted as actual protocol errors, and logged if the log
1838 selector +smtp_protocol_error was set. One cannot be perfect in this test,
1839 but now, if PIPELINING has been advertised, RCPT following a rejected MAIL,
1840 and DATA following a set of rejected RCPTs do not count as protocol errors.
1841 In other words, Exim assumes they were pipelined, though this may not
1842 actually be the case. Of course, in all cases the client gets an
1843 appropriate error code.
1844
184515. If a lookup fails in an ACL condition, a message about the failure may
1846 be available; it is used if testing the ACL cannot continue, because most
1847 such messages specify what the cause of the deferral is. However, some
1848 messages (e.g. "MYSQL: no data found") do not cause a defer. There was bug
1849 that caused an old message to be retained and used if a later statement
1850 caused a defer, replacing the real cause of the deferral.
1851
185216. If an IP address had so many PTR records that the DNS lookup buffer
1853 was not large enough to hold them, Exim could crash while trying to process
1854 the truncated data. It now detects and logs this case.
1855
185617. Further to 4.21/58, another change has been made: if (and only if) the
1857 first line of a message (the first header line) ends with CRLF, a bare LF
1858 in a subsequent header line has a space inserted after it, so as not to
1859 terminate the header.
1860
186118. Refactoring: tidied an ugly bit of code in appendfile that copied data
1862 unnecessarily, used atoi() instead of strtol(), and didn't check the
1863 termination when getting file sizes from file names by regex.
1864
186519. Completely re-implemented the support for maildirsize files, in the light
1866 of a number of problems with the previous contributed implementation
1867 (4.30/29). In particular:
1868
1869 . If the quota is zero, the maildirsize file is maintained, but no quota is
1870 imposed.
1871
1872 . If the maildir directory does not exist, it is created before any attempt
1873 to write a maildirsize file.
1874
1875 . The quota value in the file is just a cache; if the quota is changed in
1876 the transport, the new value overrides.
1877
1878 . A regular expression is available for excluding directories from the
1879 count.
1880
188120. The autoreply transport checks the characters in options that define the
1882 message's headers; it allows continued headers, but it was checking with
1883 isspace() after an embedded newline instead of explicitly looking for a
1884 space or a tab.
1885
188621. If all the "regular" hosts to which an address was routed had passed their
1887 expiry times, and had not reached their retry times, the address was
1888 bounced, even if fallback hosts were defined. Now Exim should go on to try
1889 the fallback hosts.
1890
189122. Increased buffer sizes in the callout code from 1024 to 4096 to match the
1892 equivalent code in the SMTP transport. Some hosts send humungous responses
1893 to HELO/EHLO, more than 1024 it seems.
1894
189523. Refactoring: code in filter.c used (void *) for "any old type" but this
1896 gives compiler warnings in some environments. I've now done it "properly",
1897 using a union.
1898
189924. The replacement for inet_ntoa() that is used with gcc on IRIX systems
1900 (because of problems with the built-in one) was declared to return uschar *
1901 instead of char *, causing compiler failure.
1902
190325. Fixed a file descriptor leak when processing alias/forward files.
1904
190526. Fixed a minor format string issue in dbfn.c.
1906
190727. Typo in exim.c: ("dmbnz" for "dbmnz").
1908
190928. If a filter file refered to $h_xxx or $message_headers, and the headers
1910 contained RFC 2047 "words", Exim's memory could, under certain conditions,
1911 become corrupted.
1912
191329. When a sender address is verified, it is cached, to save repeating the test
1914 when there is more than one recipient in a message. However, when the
1915 verification involves a callout, it is possible for different callout
1916 options to be set for different recipients. It is too complicated to keep
1917 track of this in the cache, so now Exim always runs a verification when a
1918 callout is required, relying on the callout cache for the optimization.
1919 The overhead is duplication of the address routing, but this should not be
1920 too great.
1921
192230. Fixed a bug in callout caching. If a RCPT command caused the sender address
1923 to be verified with callout=postmaster, and the main callout worked but the
1924 postmaster check failed, the verification correctly failed. However, if a
1925 subsequent RCPT command asked for sender verification *without* the
1926 postmaster check, incorrect caching caused this verification also to fail,
1927 incorrectly.
1928
192931. Exim caches DNS lookup failures so as to avoid multiple timeouts; however,
1930 it was not caching the DNS options (qualify_single, search_parents) that
1931 were used when the lookup failed. A subsequent lookup with different
1932 options therefore always gave the same answer, though there were cases
1933 where it should not have. (Example: a "domains = !$mx_any" option on a
1934 dnslookup router: the "domains" option is always processed without any
1935 widening, but the router might have qualify_single set.) Now Exim uses the
1936 cached value only when the same options are set.
1937
193832. Added John Jetmore's "exipick" utility to the distribution.
1939
194033. GnuTLS: When an attempt to start a TLS session fails for any reason other
1941 than a timeout (e.g. a certificate is required, and is not provided), an
1942 Exim server now closes the connection immediately. Previously it waited for
1943 the client to close - but if the client is SSL, it seems that they each
1944 wait for each other, leading to a delay before one of them times out.
1945
194634: GnuTLS: Updated the code to use the new GnuTLS 1.0.0 API. I have not
1947 maintained 0.8.x compatibility because I don't think many are using it, and
1948 it is clearly obsolete.
1949
195035. Added TLS support for CRLs: a tls_crl global option and one for the smtp
1951 transport.
1952
195336. OpenSSL: $tls_certificate_verified was being set to 1 even if the
1954 client certificate was expired. A simple patch fixes this, though I don't
1955 understand the full logic of why the verify callback is called multiple
1956 times.
1957
195837. OpenSSL: a patch from Robert Roselius: "Enable client-bug workaround.
1959 Versions of OpenSSL as of 0.9.6d include a 'CBC countermeasure' feature,
1960 which causes problems with some clients (such as the Certicom SSL Plus
1961 library used by Eudora). This option, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS,
1962 disables the coutermeasure allowing Eudora to connect."
1963
196438. Exim was not checking that a write() to a log file succeeded. This could
1965 lead to Bad Things if a log got too big, in particular if it hit a file
1966 size limit. Exim now panics and dies if it cannot write to a log file, just
1967 as it does if it cannot open a log file.
1968
196939. Modified OS/Makefile-Linux so that it now contains
1970
1971 CFLAGS=-O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
1972
1973 The two -D definitions ensure that Exim is compiled with large file
1974 support, which makes it possible to handle log files that are bigger than
1975 2^31.
1976
197740. Fixed a subtle caching bug: if (in an ACL or a set of routers, for
1978 instance) a domain was checked against a named list that involved a lookup,
1979 causing $domain_data to be set, then another domain was checked against the
1980 same list, then the first domain was re-checked, the value of $domain_data
1981 after the final check could be wrong. In particular, if the second check
1982 failed, it could be set empty. This bug probably also applied to
1983 $localpart_data.
1984
198541. The strip_trailing_dot option was not being applied to the address given
1986 with the -f command-line option.
1987
198842. The code for reading a message's header from the spool was incrementing
1989 $received_count, but never initializing it. This meant that the value was
1990 incorrect (doubled) while delivering a message in the same process in which
1991 it was received. In the most common configuration of Exim, this never
1992 happens - a fresh exec is done - but it can happen when
1993 deliver_drop_privilege is set.
1994
199543. When Exim logs an SMTP synchronization error - client data sent too soon -
1996 it now includes up to 150 characters of the unexpected data in the log
1997 line.
1998
199944. The exim_dbmbuild utility uses fixed size buffers for reading input lines
2000 and building data strings. The size of both of these buffers was 10 000
2001 bytes - far larger than anybody would *ever* want, thought I. Needless to
2002 say, somebody hit the limit. I have increased the maximum line length to
2003 20 000 and the maximum data length of concatenated lines to 100 000. I have
2004 also fixed two bugs, because there was no checking on these buffers. Tsk,
2005 tsk. Now exim_dbmbuild gives a message and exits with an error code if a
2006 buffer is too small.
2007
200845. The exim_dbmbuild utility did not support quoted keys, as Exim does in
2009 lsearch lookups. Now it does.
2010
201146. When parsing a route_list item in a manualroute router, a fixed-length
2012 buffer was used for the list of hosts. I made this 1024 bytes long,
2013 thinking that nobody would ever have a list of hosts that long. Wrong.
2014 Somebody had a whole pile of complicated expansion conditions, and the
2015 string was silently truncated, leading to an expansion error. It turns out
2016 that it is easier to change to an unlimited length (owing to other changes
2017 that have happened since this code was originally written) than to build
2018 structure for giving a limitation error. The length of the item that
2019 expands into the list of hosts is now unlimited.
2020
202147. The lsearch lookup could not handle data where the length of text line was
2022 more than 4095 characters. Such lines were truncated, leading to shortened
2023 data being returned. It should now handle lines of any length.
2024
202548. Minor wording revision: "cannot test xxx in yyy ACL" becomes "cannot test
2026 xxx condition in yyy ACL" (e.g. "cannot test domains condition in DATA
2027 ACL").
2028
202949. Cosmetic tidy to scripts like exicyclog that are generated by globally
2030 replacing strings such as BIN_DIRECTORY in a source file: the replacement
2031 no longer happens in comment lines. A list of replacements is now placed
2032 at the head of all of the source files, except those whose only change is
2033 to replace PERL_COMMAND in the very first #! line.
2034
203550. Replaced the slow insertion sort in queue.c, for sorting the list of
2036 messages on the queue, with a bottom-up merge sort, using code contributed
2037 by Michael Haardt. This should make operations like -bp somewhat faster on
2038 large queues. It won't affect queue runners, except when queue_run_in_order
2039 is set.
2040
204151. Installed eximstats 1.31 in the distribution.
2042
204352. Added support for SRV lookups to the dnslookup router.
2044
204553. If an ACL referred to $message_body or $message_body_end, the value was not
2046 reset for any messages that followed in the same SMTP session.
2047
204854. The store-handling optimization for building very long strings was not
2049 differentiating between the different store pools. I don't think this
2050 actually made any difference in practice, but I've tidied it.
2051
205255. While running the routers to verify a sender address, $sender_address
2053 was still set to the sender address. This is wrong, because when routing to
2054 send a bounce to the sender, it would be empty. Therefore, I have changed
2055 it so that, while verifying a sender address, $sender_address is set to <>.
2056 (There is no change to what happens when verifying a recipient address.)
2057
205856. After finding MX (or SRV) records, Exim was doing a DNS lookup for the
2059 target A or AAAA records (if not already returned) without resetting the
2060 qualify_single or search_parents options of the DNS resolver. These are
2061 inappropriate in this case because the targets of MX and SRV records must
2062 be FQDNs. A broken DNS record could cause trouble if it happened to have a
2063 target that, when qualified, matched something in the local domain. These
2064 two options are now turned off when doing these lookups.
2065
206657. It seems that at least some releases of Reiserfs (which does not have the
2067 concept of a fixed number of inodes) returns zero and not -1 for the
2068 number of available inodes. This interacted badly with check_spool_inodes,
2069 which assumed that -1 was the "no such thing" setting. What I have done is
2070 to check that the total number of inodes is greater than zero before doing
2071 the test of how many are available.
2072
207358. When a "warn" ACL statement has a log_message modifier, the message is
2074 remembered, and not repeated. This is to avoid a lot of repetition when a
2075 message has many recipients that cause the same warning to be written.
2076 Howewer, Exim was preserving the list of already written lines for an
2077 entire SMTP session, which doesn't seem right. The memory is now reset if a
2078 new message is started.
2079
208059. The "rewrite" debugging flag was not showing the result of rewriting in the
2081 debugging output unless log_rewrite was also set.
2082
208360. Avoid a compiler warning on 64-bit systems in dsearch.c by avoiding the use
2084 of (int)(handle) when we know that handle contains (void *)(-1).
2085
208661. The Exim daemon panic-logs an error return when it closes the incoming
2087 connection. However "connection reset by peer" seems to be common, and
2088 isn't really an error worthy of noting specially, so that particular error
2089 is no long logged.
2090
209162. When Exim is trying to find all the local interfaces, it used to panic and
2092 die if the ioctl to get the interface flags failed. However, it seems that
2093 on at least one OS (Solaris 9) it is possible to have an interface that is
2094 included in the list of interfaces, but for which you get a failure error
2095 for this call. This happens when the interface is not "plumbed" into a
2096 protocol (i.e. neither IPv4 nor IPv6). I've changed the code so that a
2097 failure of the "get flags" call assumes that the interface is down.
2098
209963. Added a ${eval10: operator, which assumes all numbers are decimal. This
2100 makes life easier for people who are doing arithmetic on fields extracted
2101 from dates, where you often get leading zeros that should not be
2102 interpreted as octal.
2103
210464. Added qualify_domain to the redirect router, to override the global
2105 setting.
2106
210765. If a pathologically long header line contained very many addresses (the
2108 report of this problem mentioned 10 000) and each of them was rewritten,
2109 Exim could use up a very large amount of memory. (It kept on making new
2110 copies of the header line as it rewrote, and never released the old ones.)
2111 At the expense of a bit more processing, the header rewriting function has
2112 been changed so that it no longer eats memory in this way.
2113
211466. The generation of the Received: header has been moved from the time that a
2115 message starts to be received, to the time that it finishes. The timestamp
2116 in the Received: header should now be very close to that of the <= log
2117 line. There are two side-effects of this change:
2118
2119 (a) If a message is rejected by a DATA or non-SMTP ACL or local_scan(), the
2120 logged header lines no longer include the local Received: line, because
2121 it has not yet been created. The same applies to a copy of the message
2122 that is returned to a non-SMTP sender when a message is rejected.
2123
2124 (b) When a filter file is tested using -bf, no additional Received: header
2125 is added to the test message. After some thought, I decided that this
2126 is a bug fix.
2127
2128 This change does not affect the value of $received_for. It is still set
2129 after address rewriting, but before local_scan() is called.
2130
213167. Installed the latest Cygwin-specific files from the Cygwin maintainer.
2132
213368. GnuTLS: If an empty file is specified for tls_verify_certificates, GnuTLS
2134 gave an unhelpful panic error message, and a defer error. I have managed to
2135 change this behaviour so that it now rejects any supplied certificate,
2136 which seems right, as the list of acceptable certificates is empty.
2137
213869. OpenSSL: If an empty file is specified for tls_verify_certificates, OpenSSL
2139 gave an unhelpful defer error. I have not managed to make this reject any
2140 supplied certificates, but the error message it gives is "no certificate
2141 supplied", which is not helpful.
2142
214370. exigrep's output now also includes lines that are not associated with any
2144 message, but which match the given pattern. Implemented by a patch from
2145 Martin Sluka, which also tidied up the Perl a bit.
2146
214771. Recipient callout verification, like sender verification, was using <> in
2148 the MAIL FROM command. This isn't really the right thing, since the actual
2149 sender may affect whether the remote host accepts the recipient or not. I
2150 have changed it to use the actual sender in the callout; this means that
2151 the cache record is now keyed on a recipient/sender pair, not just the
2152 recipient address. There doesn't seem to be a real danger of callout loops,
2153 since a callout by the remote host to check the sender would use <>.
2154 [SEE ABOVE: changed after hitting problems.]
2155
215672. Exim treats illegal SMTP error codes that do not begin with 4 or 5 as
2157 temporary errors. However, in the case of such a code being given after
2158 the end of a data transmission (i.e. after ".") Exim was failing to write
2159 a retry record for the message. (Yes, there was some broken host that was
2160 actually sending 8xx at this point.)
2161
216273. An unknown lookup type in a host list could cause Exim to panic-die when
2163 the list was checked. (An example that provoked this was putting <; in the
2164 middle of a list instead of at the start.) If this happened during a DATA
2165 ACL check, a -D file could be left lying around. This kind of configuration
2166 error no longer causes Exim to die; instead it causes a defer errror. The
2167 incident is still logged to the main and panic logs.
2168
216974. Buglet left over from Exim 3 conversion. The message "too many messages
2170 in one connection" was written to the rejectlog but not the mainlog, except
2171 when address rewriting (yes!) was being logged.
2172
217375. Added write_rejectlog option.
2174
217576. When a system filter was run not as root (that is, when system_filter_user
2176 was set), the values of the $n variables were not being returned to the
2177 main process; thus, they were not subsequently available in the $sn
2178 variables.
2179
218077. Added +return_path_on_delivery log selector.
2181
218278. A connection timeout was being treated differently from recipients deferred
2183 when testing hosts_max_try with a message that was older than the host's
2184 retry timeout. (The host should not be counted, thus allowing all hosts to
2185 be tried at least once before bouncing.) This may have been the cause of an
2186 occasionally reported bug whereby a message would remain on the queue
2187 longer than the retry timeout, but would be bounced if a delivery was
2188 forced. I say "may" because I never totally pinned down the problem;
2189 setting up timeout/retry tests is difficult. See also the next item.
2190
219179. The ultimate address timeout was not being applied to errors that involved
2192 a combination of host plus message (for example, a timeout on a MAIL
2193 command). When an address resolved to a number of possible hosts, and they
2194 were not all tried for each delivery (e.g. because of hosts_max_try), a
2195 message could remain on the queue longer than the retry timeout.
2196
219780. Sieve bug: "stop" inside "elsif" was broken. Applied a patch from Michael
2198 Haardt.
2199
220081. Fixed an obscure SMTP outgoing bug which required at least the following
2201 conditions: (a) there was another message waiting for the same server;
2202 (b) the server returned 5xx to all RCPT commands in the first message so
2203 that the message was not completed; (c) the server dropped the connection
2204 or gave a negative response to the RSET that Exim sends to abort the
2205 transaction. The observed case was a dropped connection after DATA that had
2206 been sent in pipelining mode. That is, the server had advertised PIPELINING
2207 but was not implementing it correctly. The effect of the bug was incorrect
2208 behaviour, such as trying another host, and this could lead to a crash.
2209
2210
2211Exim version 4.30
2212-----------------
2213
2214 1. The 3rd arguments to getsockname(), getpeername(), and accept() in exim.c
2215 and daemon.c were passed as pointers to ints; they should have been
2216 pointers to socklen_t variables (which are typically unsigned ints).
2217
2218 2. Some signed/unsigned type warnings in the os.c file for Linux have been
2219 fixed.
2220
2221 3. Fixed a really odd bug that affected only the testing scheme; patching a
2222 certain fixed string in the binary changed the value of another string that
2223 happened to be identical to the end of the original first string.
2224
2225 4. When gethostbyname() (or equivalent) is passed an IP address as a "host
2226 name", it returns that address as the IP address. On some operating
2227 systems (e.g. Solaris), it also passes back the IP address string as the
2228 "host name". However, on others (e.g. Linux), it passes back an empty
2229 string. Exim wasn't checking for this, and was changing the host name to an
2230 empty string, assuming it had been canonicized.
2231
2232 5. Although rare, it is permitted to have more than one PTR record for a given
2233 IP address. I thought that gethostbyaddr() or getipnodebyaddr() always gave
2234 all the names associated with an address, because they do in Solaris.
2235 However, it seems that they do not in Linux for data that comes from the
2236 DNS. If an address in /etc/hosts has multiple names, they _are_ all given.
2237 I found this out when I moved to a new Linux workstation and tried to run
2238 the Exim test suite.
2239
2240 To get round this problem I have changed the code so that it now does its
2241 own call to the DNS to look up PTR records when searching for a host name.
2242 If nothing can be found in the DNS, it tries gethostbyaddr(), so that
2243 addresses that are only in /etc/hosts are still found.
2244
2245 This behaviour is, however, controlled by an option called host_lookup_
2246 order, which defaults to "bydns:byaddr". If people want to use the other
2247 order, or indeed, just use one or the other means of lookup, they can
2248 specify it in this variable.
2249
2250 6. If a PTR record yields an empty name, Exim treats it as non-existent. In
2251 some operating systems, this comes back from gethostbyaddr() as an empty
2252 string, and this is what Exim used to test for. However, it seems that in
2253 other systems, "." is yielded. Exim now tests for this case too.
2254
2255 7. The values of check_spool_space and check_log_space are now held internally
2256 as a number of kilobytes instead of an absolute number of bytes. If a
2257 numbers is specified without 'K' or 'M', it is rounded up to the nearest
2258 kilobyte. This means that much larger values can be stored.
2259
2260 8. Exim monitor: an attempt to get the action menu when not actually pointing
2261 at a message produces an empty menu entitled "No message selected". This
2262 works on Solaris (OpenWindows). However, XFree86 does not like a menu with
2263 no entries in it ("Shell widget menu has zero width and/or height"). So I
2264 have added a single, blank menu entry in this case.
2265
2266 9. Added ${quote_local_part.
2267
226810. MIME decoding is now applied to the contents of Subject: header lines when
2269 they are logged.
2270
227111. Now that a reference to $sender_host_address automatically causes a reverse
2272 lookup to occur if necessary (4.13/18), there is no need to arrange for a
2273 host lookup before query-style lookups in lists that might use this
2274 variable. This has therefore been abolished, and the "net-" prefix is no
2275 longer necessary for query-style lookups.
2276
227712. The Makefile for SCO_SV contained a setting of LDFLAGS. This appears to
2278 have been a typo for LFLAGS, so it has been changed.
2279
228013. The install script calls Exim with "-C /dev/null" in order to find the
2281 version number. If ALT_CONFIG_PREFIX was set, this caused an error message
2282 to be output. Howeve, since Exim outputs its version number before the
2283 error, it didn't break the script. It just looked ugly. I fixed this by
2284 always allowing "-C /dev/null" if the caller is root.
2285
228614. Ignore overlarge ACL variable number when reading spool file - insurance
2287 against a later release with more variables having written the file.
2288
228915. The standard form for an IPv6 address literal was being rejected by EHLO.
2290 Example: [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
2291 this, as well as the form without the "IPv6" on the front.
2292
229316. Added CHOWN_COMMAND=/usr/sbin/chown and LIBS=-lresolv to the
2294 OS/Makefile-Darwin file.
2295
229617. Fixed typo in lookups/ldap.c: D_LOOKUP should be D_lookup. This applied
2297 only to LDAP libraries that do not have LDAP_OPT_DEREF.
2298
229918. After change 4.21/52, "%ld" was used to format the contents of the $inode
2300 variable. However, some OS use ints for inodes. I've added cast to long int
2301 to get rid of the compiler warning.
2302
230319. I had forgotten to lock out "/../" in configuration file names when
2304 ALT_CONFIG_PREFIX was set.
2305
230620. Routers used for verification do not need to specify transports. However,
2307 if such a router generated a host list, and callout was configured, Exim
2308 crashed, because it could not find a port number from the (non-existent)
2309 transport. It now assumes port 25 in this circumstance.
2310
231121. Added the -t option to exigrep.
2312
231322. If LOOKUP_LSEARCH is defined, all three linear search methods (lsearch,
2314 wildlsearch, nwildlsearch) are compiled. LOOKUP_WILDLSEARCH and LOOKUP_
2315 NWILDLSEARCH are now obsolete, but retained for compatibility. If either of
2316 them is set, LOOKUP_LSEARCH is forced.
2317
231823. "exim -bV" now outputs a list of lookups that are included in the binary.
2319
232024. Added sender and host information to the "rejected by local_scan()" log
2321 line; previously there was no indication of these.
2322
232325. Added .include_if_exists.
2324
232526. Change 3.952/11 added an explicit directory sync on top of a file sync for
2326 Linux. It turns out that not all file systems support this. Apparently some
2327 versions of NFS do not. (It's rare to put Exim's spool on NFS, but people
2328 do it.) To cope with this, the error EINVAL, which means that sync-ing is
2329 not supported on the file descriptor, is now ignored when Exim is trying to
2330 sync a directory. This applies only to Linux.
2331
233227. Added -DBIND_8_COMPAT to the CLFAGS setting for Darwin.
2333
233428. In Darwin (MacOS X), the PAM headers are in /usr/include/pam and not in
2335 /usr/include/security. There's now a flag in OS/os.h-Darwin to cope with
2336 this.
2337
233829. Added support for maildirsize files from supplied patch (modified a bit).
2339
234030. The use of :fail: followed by an empty string could lead Exim to respond to
2341 sender verification failures with (e.g.):
2342
2343 550 Verification failed for <xxx>
2344 550 Sender verify failed
2345
2346 where the first response line was missing the '-' that indicates it is not
2347 the final line of the response.
2348
234931. The loop for finding the name of the user that called Exim had a hardwired
2350 limit of 10; it now uses the value of finduser_retries, which is used for
2351 all other user lookups.
2352
235332. Added $received_count variable, available in data and not_smtp ACLs, and at
2354 delivery time.
2355
235633. Exim was neglecting to zero errno before one call of strtol() when
2357 expanding a string and expecting an integer value. On some systems this
2358 resulted in spurious "integer overflow" errors. Also, it was casting the
2359 result into an int without checking.
2360
236134. Testing for a connection timeout using "timeout_connect" in the retry rules
2362 did not work. The code looks as if it has *never* worked, though it appears
2363 to have been documented since at least releast 1.62. I have made it work.
2364
236535. The "timeout_DNS" error in retry rules, also documented since at least
2366 1.62, also never worked. As it isn't clear exactly what this means, and
2367 clearly it isn't a major issue, I have abolished the feature by treating it
2368 as "timeout", and writing a warning to the main and panic logs.
2369
237036. The display of retry rules for -brt wasn't always showing the error code
2371 correctly.
2372
237337. Added new error conditions to retry rules: timeout_A, timeout_MX,
2374 timeout_connect_A, timeout_connect_MX.
2375
237638. Rewriting the envelope sender at SMTP time did not allow it to be rewritten
2377 to the empty sender.
2378
237939. The daemon was not analysing the content of -oX till after it had closed
2380 stderr and disconnected from the controlling terminal. This meant that any
2381 syntax errors were only noted on the panic log, and the return code from
2382 the command was 0. By re-arranging the code a little, I've made the
2383 decoding happen first, so such errors now appear on stderr, and the return
2384 code is 1. However, the actual setting up of the sockets still happens in
2385 the disconnected process, so errors there are still only recorded on the
2386 panic log.
2387
238840. A daemon listener on a wildcard IPv6 socket that also accepts IPv4
2389 connections (as happens on some IP stacks) was logged at start up time as
2390 just listening for IPv6. It now logs "IPv6 with IPv4". This differentiates
2391 it from "IPv6 and IPv4", which means that two separate sockets are being
2392 used.
2393
239441. The debug output for gethostbyname2() or getipnodebyname() failures now
2395 says whether AF_INET or AF_INET6 was passed as an argument.
2396
239742. Exiwhat output was messed up when time zones were included in log
2398 timestamps.
2399
240043. Exiwhat now gives more information about the daemon's listening ports,
2401 and whether -tls-on-connect was used.
2402
240344. The "port" option of the smtp transport is now expanded.
2404
240545. A "message" modifier in a "warn" statement in a non-message ACL was being
2406 silently ignored. Now an error message is written to the main and panic
2407 logs.
2408
240946. There's a new ACL modifier called "logwrite" which writes to a log file
2410 as soon as it is encountered.
2411
241247. Added $local_user_uid and $local_user_gid at routing time.
2413
241448. Exim crashed when trying to verify a sender address that was being
2415 rewritten to "<>".
2416
241749. Exim was recognizing only a space character after ".include". It now also
2418 recognizes a tab character.
2419
242050. Fixed several bugs in the Perl script that creates the exim.8 man page by
2421 extracting the relevant information from the specification. The man page no
2422 longer contains scrambled data for the -d option, and I've added a section
2423 at the front about calling Exim under different names.
2424
242551. Added "extra_headers" argument to the "mail" command in filter files.
2426
242752. Redirecting mail to an unqualified address in a Sieve filter caused Exim to
2428 crash.
2429
243053. Installed eximstats 1.29.
2431
243254. Added transport_filter_timeout as a generic transport option.
2433
243455. Exim no longer adds an empty Bcc: header to messages that have no To: or
2435 Cc: header lines. This was required by RFC 822, but it not required by RFC
2436 2822.
2437
243856. Exim used to add From:, Date:, and Message-Id: header lines to any
2439 incoming messages that did not have them. Now it does so only if the
2440 message originates locally, that is, if there is no associated remote host
2441 address. When Resent- header lines are present, this applies to the Resent-
2442 lines rather than the non-Resent- lines.
2443
244457. Drop incoming SMTP connection after too many syntax or protocol errors. The
2445 limit is controlled by smtp_max_synprot_errors, defaulting to 3.
2446
244758. Messages for configuration errors now include the name of the main
2448 configuration file - useful now that there may be more than one file in a
2449 list (.included file names were always shown).
2450
245159. Change 4.21/82 (run initgroups() when starting the daemon) causes problems
2452 for those rare installations that do not start the daemon as root or run it
2453 setuid root. I've cut out the call to initgroups() if the daemon is not
2454 root at that time.
2455
245660. The Exim user and group can now be bound into the binary as text strings
2457 that are looked up at the start of Exim's processing.
2458
245961. Applied a small patch for the Interbase code, supplied by Ard Biesheuvel.
2460
246162. Added $mailstore_basename variable.
2462
246363. Installed patch to sieve.c from Michael Haardt.
2464
246564. When Exim failed to open the panic log after failing to open the main log,
2466 the original message it was trying to log was written to stderr and debug
2467 output, but if they were not available (the usual case in production), it
2468 was lost. Now it is written to syslog before the two lines that record the
2469 failures to open the logs.
2470
247165. Users' Exim filters run in subprocesses under the user's uid. It is
2472 possible for a "deliver" command or an alias in a "personal" command to
2473 provoke an address rewrite. If logging of address rewriting is configured,
2474 this fails because the process is not running as root or exim. There may be
2475 a better way of dealing with this, but for the moment (because 4.30 needs
2476 to be released), I have disabled address rewrite logging when running a
2477 filter in a non-root, non-exim process.
2478
2479
2480Exim version 4.24
2481-----------------
2482
2483 1. The buildconfig auxiliary program wasn't quoting the value set for
2484 HEADERS_CHARSET. This caused a compilation error complaining that 'ISO' was
2485 not defined. This bug was masked in 4.22 by the effect that was fixed in
2486 change 4.23/1.
2487
2488 2. Some messages that were rejected after a message id was allocated were
2489 shown as "incomplete" by exigrep. It no longer does this for messages that
2490 are rejected by local_scan() or the DATA or non-SMTP ACLs.
2491
2492 3. If a Message-ID: header used a domain literal in the ID, and Exim did not
2493 have allow_domain_literals set, the ID did not get logged in the <= line.
2494 Domain literals are now always recognized in Message-ID: header lines.
2495
2496 4. The first argument for a ${extract expansion item is the key name or field
2497 number. Leading and trailing spaces in this item were not being ignored,
2498 causing some misleading effects.
2499
2500 5. When deliver_drop_privilege was set, single queue runner processes started
2501 manually (i.e. by the command "exim -q") or by the daemon (which uses the
2502 same command in the process it spins off) were not dropping privilege.
2503
2504 6. When the daemon running as "exim" started a queue runner, it always
2505 re-executed Exim in the spun-off process. This is a waste of effort when
2506 deliver_drop_privilege is set. The new process now just calls the
2507 queue-runner function directly.
2508
2509
2510Exim version 4.23
2511-----------------
2512
2513 1. Typo in the src/EDITME file: it referred to HEADERS_DECODE_TO instead of
2514 HEADERS_CHARSET.
2515
2516 2. Change 4.21/73 introduced a bug. The pid file path set by -oP was being
2517 ignored. Though the use of -oP was forcing the writing of a pid file, it
2518 was always written to the default place.
2519
2520 3. If the message "no IP address found for host xxxx" is generated during
2521 incoming verification, it is now followed by identification of the incoming
2522 connection (so you can more easily find what provoked it).
2523
2524 4. Bug fix for Sieve filters: "stop" inside a block was not working properly.
2525
2526 5. Added some features to "harden" Exim a bit more against certain attacks:
2527
2528 (a) There is now a build-time option called FIXED_NEVER_USERS that can
2529 be put in Local/Makefile. This is like the never_users runtime option,
2530 but it cannot be overridden. The default setting is "root".
2531
2532 (b) If ALT_CONFIG_PREFIX is defined in Local/Makefile, it specifies a
2533 prefix string with which any file named in a -C command line option
2534 must start.
2535
2536 (c) If ALT_CONFIG_ROOT_ONLY is defined in Local/Makefile, root privilege
2537 is retained for -C and -D only if the caller of Exim is root. Without
2538 it, the exim user may also use -C and -D and retain privilege.
2539
2540 (d) If DISABLE_D_OPTION is defined in Local/Makefile, the use of the -D
2541 command line option is disabled.
2542
2543 6. Macro names set by the -D option must start with an upper case letter, just
2544 like macro names defined in the configuration file.
2545
2546 7. Added "dereference=" facility to LDAP.
2547
2548 8. Two instances of the typo "uknown" in the source files are fixed.
2549
2550 9. If a PERL_COMMAND setting in Local/Makefile was not at the start of a line,
2551 the Configure-Makefile script screwed up while processing it.
2552
255310. Incorporated PCRE 4.4.
2554
255511. The SMTP synchronization check was not operating right at the start of an
2556 SMTP session. For example, it could not catch a HELO sent before the client
2557 waited for the greeting. There is now a check for outstanding input at the
2558 point when the greeting is written. Because of the duplex, asynchronous
2559 nature of TCP/IP, it cannot be perfect - the incorrect input may be on its
2560 way, but not yet received, when the check is performed.
2561
256212. Added tcp_nodelay to make it possible to turn of the setting of TCP_NODELAY
2563 on TCP/IP sockets, because this apparently causes some broken clients to
2564 timeout.
2565
256613. Installed revised OS/Makefile-CYGWIN and OS/os.c-cygwin (the .h file was
2567 unchanged) from the Cygwin maintainer.
2568
256914. The code for -bV that shows what is in the binary showed "mbx" when maildir
2570 was supported instead of testing for mbx. Effectively a typo.
2571
257215. The spa authenticator server code was not checking that the input it
2573 received was valid base64.
2574
257516. The debug output line for the "set" modifier in ACLs was not showing the
2576 name of the variable that was being set.
2577
257817. Code tidy: the variable type "vtype_string" was never used. Removed it.
2579
258018. Previously, a reference to $sender_host_name did not cause a DNS reverse
2581 lookup on its own. Something else was needed to trigger the lookup. For
2582 example, a match in host_lookup or the need for a host name in a host list.
2583 Now, if $sender_host_name is referenced and the host name has not yet been
2584 looked up, a lookup is performed. If the lookup fails, the variable remains
2585 empty, and $host_lookup_failed is set to "1".
2586
258719. Added "eqi" as a case-independent comparison operator.
2588
258920. The saslauthd authentication condition could segfault if neither service
2590 nor realm was specified.
2591
259221. If an overflowing value such as "2048M" was set for message_size_limit, the
2593 error message that was logged was misleading, and incoming SMTP
2594 connections were dropped. The message is now more accurate, and temporary
2595 errors are given to SMTP connections.
2596
259722. In some error situations (such as 21 above) Exim rejects all SMTP commands
2598 (except RSET) with a 421 error, until QUIT is received. However, it was
2599 failing to send a response to QUIT.
2600
260123. The HELO ACL was being run before the code for helo_try_verify_hosts,
2602 which made it impossible to use "verify = helo" in the HELO ACL. The HELO
2603 ACL is now run after the helo_try_verify_hosts code.
2604
260524. "{MD5}" and "{SHA1}" are now recognized as equivalent to "{md5"} and
2606 "{sha1}" in the "crypteq" expansion condition (in fact the comparison is
2607 case-independent, so other case variants are also recognized). Apparently
2608 some systems use these upper case variants.
2609
261025. If more than two messages were waiting for the same host, and a transport
2611 filter was specified for the transport, Exim sent two messages over the
2612 same TCP/IP connection, and then failed with "socket operation on non-
2613 socket" when it tried to send the third.
2614
261526. Added Exim::debug_write and Exim::log_write for embedded Perl use.
2616
261727. The extern definition of crypt16() in expand.c was not being excluded when
2618 the OS had its own crypt16() function.
2619
262028. Added bounce_return_body as a new option, and bounce_return_size_limit
2621 as a preferred synonym for return_size_limit, both as an option and as an
2622 expansion variable.
2623
262429. Added LIBS=-liconv to OS/Makefile-OSF1.
2625
262630. Changed the default configuration ACL to relax the local part checking rule
2627 for addresses that are not in any local domains. For these addresses,
2628 slashes and pipe symbols are allowed within local parts, but the sequence
2629 /../ is explicitly forbidden.
2630
263131. SPA server authentication was not clearing the challenge buffer before
2632 using it.
2633
263432. log_message in a "warn" ACL statement was writing to the reject log as
2635 well as to the main log, which contradicts the documentation and doesn't
2636 seem right (because no rejection is happening). So I have stopped it.
2637
263833. Added Ard Biesheuvel's lookup code for accessing an Interbase database.
2639 However, I am unable to do any testing of this.
2640
264134. Fixed an infelicity in the appendfile transport. When checking directories
2642 for a mailbox, to see if any needed to be created, it was accidentally
2643 using path names with one or more superfluous leading slashes; tracing
2644 would show up entries such as stat("///home/ph10", 0xFFBEEA48).
2645
264635. If log_message is set on a "discard" verb in a MAIL or RCPT ACL, its
2647 contents are added to the log line that is written for every discarded
2648 recipient. (Previously a log_message setting was ignored.)
2649
265036. The ${quote: operator now quotes the string if it is empty.
2651
265237. The install script runs exim in order to find its version number. If for
2653 some reason other than non-existence or emptiness, which it checks, it
2654 could not run './exim', it was installing it with an empty version number,
2655 i.e. as "exim-". This error state is now caught, and the installation is
2656 aborted.
2657
265838. An argument was missing from the function that creates an error message
2659 when Exim fails to connect to the socket for saslauthd authentication.
2660 This could cause Exim to crash, or give a corrupted message.
2661
266239. Added isip, isip4, and isip6 to ${if conditions.
2663
266440. The ACL variables $acl_xx are now saved with the message, and can be
2665 accessed later in routers, transports, and filters.
2666
266741. The new lookup type nwildlsearch is like wildlsearch, except that the key
2668 strings in the file are not string-expanded.
2669
267042. If a MAIL command specified a SIZE value that was too large to fit into an
2671 int variable, the check against message_size_limit failed. Such values are
2672 now forced to INT_MAX, which is around 2Gb for a 32-bit variable. Maybe one
2673 day this will have to be increased, but I don't think I want to be around
2674 when emails are that large.
2675
2676
2677
2678Exim version 4.22
2679-----------------
2680
2681 1. Removed HAVE_ICONV=yes from OS/Makefile-FreeBSD, since it seems that
2682 iconv() is not standard in FreeBSD.
2683
2684 2. Change 4.21/17 was buggy and could cause stack overwriting on a system with
2685 IPv6 enabled. The observed symptom was a segmentation fault on return from
2686 the function os_common_find_running_interfaces() in src/os.c.
2687
2688 3. In the check_special_case() function in daemon.c I had used "errno" as an
2689 argument name, which causes warnings on some systems. This was basically a
2690 typo, since it was named "eno" in the comments!
2691
2692 4. The code that waits for the clock to tick (at a resolution of some fraction
2693 of a second) so as to ensure message-id uniqueness was always waiting for
2694 at least one whole tick, when it could have waited for less. [This is
2695 almost certainly not relevant at current processor speeds, where it is
2696 unlikely to ever wait at all. But we try to future-proof.]
2697
2698 5. The function that sleeps for a time interval that includes fractions of a
2699 second contained a race. It did not block SIGALRM between setting the
2700 timer, and suspending (a couple of lines later). If the interval was short
2701 and the sigsuspend() was delayed until after it had expired, the suspension
2702 never ended. On busy systems this could lead to processes getting stuck for
2703 ever.
2704
2705 6. Some uncommon configurations may cause a lookup to happen in a queue runner
2706 process, before it forks any delivery processes. The open lookup caching
2707 mechanism meant that the open file or database connection was passed into
2708 the delivery process. The problem was that delivery processes always tidy
2709 up cached lookup data. This could cause a problem for the next delivery
2710 process started by the queue runner, because the external queue runner
2711 process does not know about the closure. So the next delivery process
2712 still has data in the lookup cache. In the case of a file lookup, there was
2713 no problem because closing a file descriptor in a subprocess doesn't affect
2714 the parent. However, if the lookup was caching a connection to a database,
2715 the connection was closed, and the second delivery process was likely to
2716 see errors such as "PGSQL: query failed: server closed the connection
2717 unexpectedly". The problem has been fixed by closing all cached lookups
2718 in a queue runner before running a delivery process.
2719
2720 7. Compiler warning on Linux for the second argument of iconv(), which doesn't
2721 seem to have the "const" qualifier which it has on other OS. I've
2722 parameterised it.
2723
2724 8. Change 4.21/2 was too strict. It is only if there are two authenticators
2725 *of the same type* (client or server) with the same public name that an
2726 error should be diagnosed.
2727
2728 9. When Exim looked up a host name for an IP address, but failed to find the
2729 original IP address when looking up the host name (a safety check), it
2730 output the message "<ip address> does not match any IP for NULL", which was
2731 confusing, to say the least. The bug was that the host name should have
2732 appeared instead of "NULL".
2733
273410. Since release 3.03, if Exim is called by a uid other than root or the Exim
2735 user that is built into the binary, and the -C or -D options is used, root
2736 privilege is dropped before the configuration file is read. In addition,
2737 logging is switched to stderr instead of the normal log files. If the
2738 configuration then re-defines the Exim user, the unprivileged environment
2739 is probably not what is expected, so Exim logs a panic warning message (but
2740 proceeds).
2741
2742 However, if deliver_drop_privilege is set, the unprivileged state may well
2743 be exactly what is intended, so the warning has been cut out in that case,
2744 and Exim is allowed to try to write to its normal log files.
2745
2746
2747Exim version 4.21
2748-----------------
2749
2750 1. smtp_return_error_details was not giving details for temporary sender
2751 or receiver verification errors.
2752
2753 2. Diagnose a configuration error if two authenticators have the same public
2754 name.
2755
2756 3. Exim used not to create the message log file for a message until the first
2757 delivery attempt. This could be confusing when incoming messages were held
2758 for policy or load reasons. The message log file is now created at the time
2759 the message is received, and an initial "Received" line is written to it.
2760
2761 4. The automatically generated man page for command line options had a minor
2762 bug that caused no ill effects; however, a more serious problem was that
2763 the procedure for building the man page automatically didn't always
2764 operate. Consequently, release 4.20 contains an out-of-date version. This
2765 shouldn't happen again.
2766
2767 5. When building Exim with embedded Perl support, the script that builds the
2768 Makefile was calling 'perl' to find its compile-time parameters, ignoring
2769 any setting of PERL_COMMAND in Local/Makefile. This is now fixed.
2770
2771 6. The freeze_tell option was not being used for messages that were frozen on
2772 arrival, either by an ACL or by local_scan().
2773
2774 7. Added the smtp_incomplete_transaction log selector.
2775
2776 8. After STARTTLS, Exim was not forgetting that it had advertised AUTH, so it
2777 was accepting AUTH without a new EHLO.
2778
2779 9. Added tls_remember_esmtp to cope with YAEB. This allows AUTH and other
2780 ESMTP extensions after STARTTLS without a new EHLO, in contravention of the
2781 RFC.
2782
278310. Logging of TCP/IP connections (when configured) now happens in the main
2784 daemon process instead of the child process, so that the TCP/IP connection
2785 count is more accurate (but it can never be perfect).
2786
278711. The use of "drop" in a nested ACL was not being handled correctly in the
2788 outer ACL. Now, if condition failure induced by the nested "drop" causes
2789 the outer ACL verb to deny access ("accept" or "discard" after "endpass",
2790 or "require"), the connection is dropped.
2791
279212. Similarly, "discard" in a nested ACL wasn't being handled. A nested ACL
2793 that yield "discard" can now be used with an "accept" or a "discard" verb,
2794 but an error is generated for any others (because I can't see a useful way
2795 to define what should happen).
2796
279713. When an ACL is read dynamically from a file (or anywhere else), the lines
2798 are now processed in the same way as lines in the Exim configuration file.
2799 In particular, continuation lines are supported.
2800
280114. Added the "dnslists = a.b.c!=n.n.n.n" feature.
2802
280315. Added -ti meaning -t -i.
2804
280516. Check for letters, digits, hyphens, and dots in the names of dnslist
2806 domains, and warn by logging if others are found.
2807
280817. At least on BSD, alignment is not guarenteed for the array of ifreq's
2809 returned from GIFCONF when Exim is trying to find the list of interfaces on
2810 a host. The code in os.c has been modified to copy each ifreq to an aligned
2811 structure in all cases.
2812
2813 Also, in some cases, the returned ifreq's were being copied to a 'struct
2814 ifreq' on the stack, which was subsequently passed to host_ntoa(). That
2815 means the last couple of bytes of an IPv6 address could be chopped if the
2816 ifreq contained only a normal sockaddr (14 bytes storage).
2817
281818. Named domain lists were not supported in the hosts_treat_as_local option.
2819 An entry such as +xxxx was not recognized, and was treated as a literal
2820 domain name.
2821
282219. Ensure that header lines added by a DATA ACL are included in the reject log
2823 if the ACL subsequently rejects the message.
2824
282520. Upgrade the cramtest.pl utility script to use Digest::MD5 instead of just
2826 MD5 (which is deprecated).
2827
282821. When testing a filter file using -bf, Exim was writing a message when it
2829 took the sender from a "From " line in the message, but it was not doing so
2830 when it took $return_path from a Return-Path: header line. It now does.
2831
283222. If the contents of a "message" modifier for a "warn" ACL verb do not begin
2833 with a valid header line field name (a series of printing characters
2834 terminated by a colon, Exim now inserts X-ACL-Warn: at the beginning.
2835
283623. Changed "disc" in the source to "disk" to conform to the documentation and
2837 the book and for uniformity.
2838
283924. Ignore Sendmail's -Ooption=value command line item.
2840
284125. When execve() failed while trying to run a command in a pipe transport,
2842 Exim was returning EX_UNAVAILBLE (69) from the subprocess. However, this
2843 could be confused with a return value of 69 from the command itself. This
2844 has been changed to 127, the value the shell returns if it is asked to run
2845 a non-existent command. The wording for the related log line suggests a
2846 non-existent command as the problem.
2847
284826. If received_header_text expands to an empty string, do not add a Received:
2849 header line to the message. (Well, it adds a token one on the spool, but
2850 marks it "old" so that it doesn't get used or transmitted.)
2851
285227. Installed eximstats 1.28 (addition of -nt option).
2853
285428. There was no check for failure on the call to getsockname() in the daemon
2855 code. This can fail if there is a shortage of resources on the system, with
2856 ENOMEM, for example. A temporary error is now given on failure.
2857
285829. Contrary to the C standard, it seems that in some environments, the
2859 equivalent of setlocale(LC_ALL, "C") is not obeyed at the start of a C
2860 program. Exim now does this explicitly; it affects the formatting of
2861 timestamps using strftime().
2862
286330. If exiqsumm was given junk data, it threw up some uninitialized variable
2864 complaints. I've now initialized all the variables, to avoid this.
2865
286632. Header lines added by a system filter were not being "seen" during
2867 transport-time rewrites.
2868
286933. The info_callback() function passed to OpenSSL is set up with type void
2870 (*)(SSL *, int, int), as described somewhere. However, when calling the
2871 function (actually a macro) that sets it up, the type void(*)() is
2872 expected. I've put in a cast to prevent warnings from picky compilers.
2873
287434. If a DNS black list lookup found a CNAME record, but there were no A
2875 records associated with the domain it pointed at, Exim crashed.
2876
287735. If a DNS black list lookup returned more than one A record, Exim ignored
2878 all but the first. It now scans all returned addresses if a particular IP
2879 value is being sought. In this situation, the contents of the
2880 $dnslist_value variable are a list of all the addresses, separated by a
2881 comma and a space.
2882
288336. Tightened up the rules for host name lookups using reverse DNS. Exim used
2884 to accept a host name and all its aliases if the forward lookup for any of
2885 them yielded the IP address of the incoming connection. Now it accepts only
2886 those names whose forward lookup yields the correct IP address. Any other
2887 names are discarded. This closes a loophole whereby a rogue DNS
2888 administrator could create reverse DNS records to break through a
2889 wildcarded host restriction in an ACL.
2890
289137. If a user filter or a system filter that ran in a subprocess used any of
2892 the numerical variables ($1, $2 etc), or $thisaddress, in a pipe command,
2893 the wrong values were passed to the pipe command ($thisaddress had the
2894 value of $0, $0 had the value of $1, etc). This bug was introduced by
2895 change 4.11/101, and not discovered because I wrote an inadequate test. :-(
2896
289738. Improved the line breaking for long SMTP error messages from ACLs.
2898 Previously, if there was no break point between 40 and 75 characters, Exim
2899 left the rest of the message alone. Two changes have been made: (a) I've
2900 reduced the minimum length to 35 characters; (b) if it can't find a break
2901 point between 35 and 75 characters, it looks ahead and uses the first one
2902 that it finds. This may give the occasional overlong line, but at least the
2903 remaining text gets split now.
2904
290539. Change 82 of 4.11 was unimaginative. It assumed the limit on the number of
2906 file descriptors might be low, and that setting 1000 would always raise it.
2907 It turns out that in some environments, the limit is already over 1000 and
2908 that lowering it causes trouble. So now Exim takes care not to decrease it.
2909
291040. When delivering a message, the value of $return_path is set to $sender_
2911 address at the start of routing (routers may change the value). By an
2912 oversight, this default was not being set up when an address was tested by
2913 -bt or -bv, which affected the outcome if any router or filter referred to
2914 $return_path.
2915
291641. The idea of the "warn" ACL verb is that it adds a header or writes to the
2917 log only when "message" or "log_message" are set. However, if one of the
2918 conditions was an address verification, or a call to a nested ACL, the
2919 messages generated by the underlying test were being passed through. This
2920 no longer happens. The underlying message is available in $acl_verify_
2921 message for both "message" and "log_message" expansions, so it can be
2922 passed through if needed.
2923
292442. Added RFC 2047 interpretation of header lines for $h_ expansions, with a
2925 new expansion $bh_ to give the encoded byte string without charset
2926 translation. Translation happens only if iconv() is available; HAVE_ICONV
2927 indicates this at build time. HEADERS_CHARSET gives the charset to
2928 translate to; headers_charset can change it in the configuration, and
2929 "headers charset" can change it in an individual filter file.
2930
293143. Now that we have a default RFC 2047 charset (see above), the code in Exim
2932 that creates RFC 2047 encoded "words" labels them as that charset instead
2933 of always using iso-8859-1. The cases are (i) the explicit ${rfc2047:
2934 expansion operator; (ii) when Exim creates a From: line for a local
2935 message; (iii) when a header line is rewritten to include a "phrase" part.
2936
293744. Nasty bug in exiqsumm: the regex to skip already-delivered addresses was
2938 buggy, causing it to skip the first lines of messages whose message ID
2939 ended in 'D'. This would not have bitten before Exim release 4.14, because
2940 message IDs were unlikely to end in 'D' before then. The effect was to have
2941 incorrect size information for certain domains.
2942
294345. #include "config.h" was missing at the start of the crypt16.c module. This
2944 caused trouble on Tru64 (aka OSF1) systems, because HAVE_CRYPT16 was not
2945 noticed.
2946
294746. If there was a timeout during a "random" callout check, Exim treated it as
2948 a failure of the random address, and carried on sending RSET and the real
2949 address. If the delay was just some slowness somewhere, the response to the
2950 original RCPT would be taken as a response to RSET and so on, causing
2951 mayhem of various kinds.
2952
295347. Change 50 for 4.20 was a heap of junk. I don't know what I was thinking
2954 when I implemented it. It didn't allow for the fact that some option values
2955 may legitimatetly be negative (e.g. size_addition), and it didn't even do
2956 the right test for positive values.
2957
295848. Domain names in DNS records are case-independent. Exim always looks them up
2959 in lower case. Some resolvers return domain names in exactly the case they
2960 appear in the zone file, that is, they may contain uppercase letters. Not
2961 all resolvers do this - some return always lower case. Exim was treating a
2962 change of case by a resolver as a change of domain, similar to a widening
2963 of a domain abbreviation. This triggered its re-routing code and so it was
2964 trying to route what was effectively the same domain again. This normally
2965 caused routing to fail (because the router wouldn't handle the domain
2966 twice). Now Exim checks for this case specially, and just changes the
2967 casing of the domain that it ultimately uses when it transmits the message
2968 envelope.
2969
297049. Added Sieve (RFC 3028) support, courtesy of Michael Haardt's contributed
2971 module.
2972
297350. If a filter generated a file delivery with a non-absolute name (possible if
2974 no home directory exists for the router), the forbid_file option was not
2975 forbidding it.
2976
297751. Added '&' feature to dnslists, to provide bit mask matching in addition to
2978 the existing equality matching.
2979
298052. Exim was using ints instead of ino_t variables in some places where it was
2981 dealing with inode numbers.
2982
298353. If TMPDIR is defined in Local/Makefile (default in src/EDITME is
2984 TMPDIR="/tmp"), Exim checks for the presence of an environment variable
2985 called TMPDIR, and if it finds it is different, it changes its value.
2986
298754. The smtp_printf() function is now made available to local_scan() so
2988 additional output lines can be written before returning. There is also an
2989 smtp_fflush() function to enable the detection of a dropped connection.
2990 The variables smtp_input and smtp_batched_input are exported to
2991 local_scan().
2992
299355. Changed the default runtime configuration: the message "Unknown user"
2994 has been removed from the ACL, and instead placed on the localuser router,
2995 using the cannot_route_message feature. This means that any verification
2996 failures that generate their own messages won't get overridden. Similarly,
2997 the "Unrouteable address" message that was in the ACL for unverifiable
2998 relay addresses has also been removed.
2999
300056. Added hosts_avoid_esmtp to the smtp transport.
3001
300257. The exicyclog script was not checking for the esoteric option
3003 CONFIGURE_FILE_USE_EUID in the Local/Makefile. It now does this, but it
3004 will work only if exicyclog is run under the appropriate euid.
3005
300658. Following a discussion on the list, the rules by which Exim recognises line
3007 endings on incoming messages have been changed. The -dropcr and drop_cr
3008 options are now no-ops, retained only for backwards compatibility. The
3009 following line terminators are recognized: LF CRLF CR. However, special
3010 processing applies to CR:
3011
3012 (i) The sequence CR . CR does *not* terminate an incoming SMTP message,
3013 nor a local message in the state where . is a terminator.
3014
3015 (ii) If a bare CR is encountered in a header line, an extra space is added
3016 after the line terminator so as not to end the header. The reasoning
3017 behind this is that bare CRs in header lines are most likely either
3018 to be mistakes, or people trying to play silly games.
3019
302059. The size of a message, as listed by "-bp" or in the Exim monitor window,
3021 was being incorrectly given as 18 bytes larger than it should have been.
3022 This is a VOB (very old bug).
3023
302460. This may never have affected anything current, but just in case it has:
3025 When the local host is found other than at the start of a list of hosts,
3026 the local host, those with the same MX, and any that follow, are discarded.
3027 When the list in question was part of a longer list of hosts, the following
3028 hosts (not currently being processed) were also being discarded. This no
3029 longer happens. I'm not sure if this situation could ever has previously
3030 arisen.
3031
303261. Added the "/MX" feature to lists of hosts in the manualroute and query
3033 program routers.
3034
303562. Whenever Exim generates a new message, it now adds an Auto-Submitted:
3036 header. This is something that is recommended in a new Internet Draft, and
3037 is something that is documented as being done by Sendmail. There are two
3038 possible values. For messages generated by the autoreply transport, Exim
3039 adds:
3040
3041 Auto-Submitted: auto-replied
3042
3043 whereas for all other generated messages (e.g. bounces) it adds
3044
3045 Auto-Submitted: auto-generated
3046
304763. The "personal" condition in filters now includes a test for the
3048 Auto-Submitted: header. If it contains the string "auto-" the message it
3049 not considered personal.
3050
305164. Added rcpt_include_affixes as a generic transport option.
3052
305365. Added queue_only_override (default true).
3054
305566. Added the syslog_duplication option.
3056
305767. If what should have been the first header line of a message consisted of
3058 a space followed by a colon, Exim was mis-interpreting it as a header line.
3059 It isn't of course - it is syntactically invalid and should therefore be
3060 treated as the start of the message body. The misbehaviour could have
3061 caused a number of strange effects, including loss of data in subsequent
3062 header lines, and spool format errors.
3063
306468. Formerly, the AUTH parameter on a MAIL command was trusted only if the
3065 client host had authenticated. This control can now be exercised by an ACL
3066 for more flexibility.
3067
306869. By default, callouts do not happen when testing with -bh. There is now a
3069 variant, -bhc, which does actually run the callout code, including
3070 consulting and updating the callout cache.
3071
307270. Added support for saslauthd authentication, courtesy of Alexander
3073 Sabourenkov.
3074
307571. If statvfs() failed on the spool or log directories while checking their
3076 size for availability, Exim confusingly gave the error "space shortage".
3077 Furthermore, in debugging mode it crashed with a floating point exception.
3078 These checks are done if check_{spool,log}_{space,inodes} are set, and when
3079 an SMTP message arrives with SIZE= on the MAIL command. As this is a really
3080 serious problem, Exim now writes to the main and panic logs when this
3081 happens, with details of the failure. It then refuses to accept the
3082 incoming message, giving the message "spool directory problem" or "log
3083 directory problem" with a 421 code for SMTP messages.
3084
308572. When Exim is about to re-exec itself, it ensures that the file descriptors
3086 0, 1, and 2 exist, because some OS complain for execs without them (see
3087 ChangeLog 4.05/30). If necessary, Exim opens /dev/null to use for these
3088 descriptors. However, the code omitted to check that the open succeeded,
3089 causing mysterious errors if for some reason the permissions on /dev/null
3090 got screwed. Now Exim writes a message to the main and panic logs, and
3091 bombs out if it can't open /dev/null.
3092
309373. Re-vamped the way daemon_smtp_port, local_interfaces, and -oX work and
3094 interact so that it is all more flexible. It is supposed to remain
3095 backwards compatible. Also added extra_local_interfaces.
3096
309774. Invalid data sent to a SPA (NTLM) server authenticator could cause the code
3098 to bomb out with an assertion failure - to the client this appears as a
3099 connection drop. This problem occurs in the part of the code that was taken
3100 from the Samba project. Fortunately, the assertion is in a very simple
3101 function, so I have fixed this by reproducing the function inline in the
3102 one place where it is called, and arranging for authentication to fail
3103 instead of killing the process with assert().
3104
310575. The SPA client code was not working when the server requested OEM rather
3106 than Unicode encoding.
3107
310876. Added code to make require_files with a specific uid setting more usable in
3109 the case where statting the file as root fails - usually a non-root-mounted
3110 NFS file system. When this happens and the failure is EACCES, Exim now
3111 forks a subprocess and does the per-uid checking as the relevant uid.
3112
311377. Added process_log_path.
3114
311578. If log_file_path was not explicitly set, a setting of check_log_space or
3116 check_log_inodes was ignored.
3117
311879. If a space check for the spool or log partitions fails, the incident is now
3119 logged. Of course, in the latter case the data may get lost...
3120
312180. Added the %p formatting code to string_format() so that it can be used to
3122 print addresses in debug_print(). Adjusted all the address printing in the
3123 debugging in store.c to use %p rather than %d.
3124
312581. There was a concern that a line of code in smtp_in.c could overflow a
3126 buffer if a HELO/EHLO command was given followed by 500 or so spaces. As
3127 initially expressed, the concern was not well-founded, because trailing
3128 spaces are removed early. However, if the trailing spaces were followed by
3129 a NULL, they did not get removed, so the overflow was possible. Two fixes
3130 were applied:
3131
3132 (a) I re-wrote the offending code in a cleaner fashion.
3133 (b) If an incoming SMTP command contains a NULL character, it is rejected
3134 as invalid.
3135
313682. When Exim changes uid/gid to the Exim user at daemon start time, it now
3137 runs initgroups(), so that if the Exim user is in any additional groups,
3138 they will be used during message reception.
3139
3140
3141Exim version 4.20
3142-----------------
3143
3144The change log for 4.20 and earlier releases has been archived.
3145
3146****