1 $Cambridge: exim/doc/doc-txt/ChangeLog,v 1.227 2005/09/13 11:13:27 ph10 Exp $
3 Change log file for Exim from version 4.21
4 -------------------------------------------
9 TK/01 Added the "success_on_redirect" address verification option. See
10 NewStuff for rationale and an example.
12 PH/01 Added support for SQLite, basic code supplied by David Woodhouse.
14 PH/02 Patch to exigrep to allow it to work on syslog lines.
16 PH/03 When creating an mbox file for a virus/spam scan, use fseek() instead of
17 fread() to skip over the body file's header line, because in Cygwin the
18 header line is locked and is inaccessible.
20 PH/04 Added $message_exim_id, ultimately to replace $message_id (they will both
21 co-exist for some time) to make it clear that it is the Exim ID that is
22 referenced, not the Message-ID: header line.
24 PH/05 Replaced all Tom's calls to snprintf() with calls to the internal
25 string_format() function, because snprintf() does not exist on all
28 PH/06 The use of forbid_filter_existstest now also locks out the use of the
29 ${stat: expansion item.
31 PH/07 Changed "SMTP protocol violation: synchronization error" into "SMTP
32 protocol synchronization error", to keep the pedants happy.
34 PH/08 Arrange for USE_INET_NTOA_FIX to be set in config.h for AIX systems as
35 well as for IRIX systems, when gcc is being used. See the host.c source
38 PH/09 Installed latest Cygwin configuration files from the Cygwin maintainer.
40 PH/10 Named domain lists were not working if used in a queue_smtp_domains
43 PH/11 Added support for the IGNOREQUOTA extension to LMTP, both to the lmtp
44 transport and to the smtp transport in LMTP mode.
46 TK/02 Remove one case of BASE64 error detection FTTB (undocumented anyway).
48 PH/12 There was a missing call to search_tidyup() before the fork() in rda.c to
49 run a filter in a subprocess. This could lead to confusion in subsequent
50 lookups in the parent process. There should also be a search_tidyup() at
51 the end of the subprocess.
53 PH/13 Previously, if "verify = helo" was set in an ACL, the condition was true
54 only if the host matched helo_try_verify_hosts, which caused the
55 verification to occur when the EHLO/HELO command was issued. The ACL just
56 tested the remembered result. Now, if a previous verification attempt has
57 not happened, "verify = helo" does it there and then.
59 JJ/01 exipick: added $message_exim_id variable (see 4.53-PH/04)
61 TK/03 Fix log output including CR from clamd.
63 PH/14 A reference to $reply_address when Reply-to: was empty and From: did not
64 exist provoked a memory error which could cause a segfault.
66 PH/15 Installed PCRE 6.2
68 PH/17 Defined BIND_8_COMPAT in the Darwin os.h file.
70 PH/18 Reversed 4.52/PH/17 because the HP-UX user found it wasn't the cause
71 of the problem. Specifically, suggested +O2 rather than +O1 for the
74 PH/19 Added sqlite_lock_timeout option (David Woodhouse's patch).
76 PH/20 If a delivery was routed to a non-standard port by means of an SRV
77 record, the port was not correctly logged when the outgoing_port log
78 selector was set (it logged the transort's default port).
80 PH/21 Added support for host-specific ports to manualroute, queryprogram,
81 fallback_hosts, and "hosts" in the smtp transport.
83 PH/22 If the log selector "outgoing_port" is set, the port is now also given on
84 host errors such as "Connection refused".
86 PH/23 Applied a patch to fix problems with exim-4.52 while doing radius
87 authentication with radiusclient 0.4.9:
89 - Error returned from rc_read_config was caught wrongly
90 - Username/password not passed on to radius server due to wrong length.
92 The presumption is that some radiusclient API changes for 4.51/PH/17
93 were not taken care of correctly. The code is still untested by me (my
94 Linux distribution still has 0.3.2 of radiusclient), but it was
95 contributed by a Radius user.
97 PH/24 When doing a callout, the value of $domain wasn't set correctly when
98 expanding the "port" option of the smtp transport.
100 TK/04 MIME ACL: Fix buffer underrun that occurs when EOF condition is met
101 while reading a MIME header. Thanks to Tom Hughes for a patch.
103 PH/24 Include config.h inside local_scan.h so that configuration settings are
106 PH/25 Make $smtp_command_argument available after all SMTP commands. This means
107 that in an ACL for RCPT (for example), you can examine exactly what was
110 PH/26 Exim was recognizing IPv6 addresses of the form [IPv6:....] in EHLO
111 commands, but it was not correctly comparing the address with the actual
112 client host address. Thus, it would show the EHLO address in Received:
113 header lines when this was not necessary.
115 PH/27 Added the % operator to ${eval:}.
117 PH/28 Exim tries to create and chdir to its spool directory when it starts;
118 it should be ignoring failures (because with -C, for example, it has lost
119 privilege). It wasn't ignoring creation failures other than "already
122 PH/29 Added "crypteq" to the list of supported features that Exim outputs when
125 PH/30 Fixed (presumably very longstanding) bug in exim_dbmbuild: if it failed
126 because an input line was too long, either on its own, or by virtue of
127 too many continuations, the temporary file was not being removed, and the
128 return code was incorrect.
130 PH/31 Missing "BOOL" in function definition in filtertest.c.
132 PH/32 Applied Sieve patches from the maintainer.
134 TK/05 Domainkeys: Accomodate for a minor API change in libdomainkeys 0.67.
136 PH/33 Added "verify = not_blind".
138 PH/34 There are settings for CHOWN_COMMAND and MV_COMMAND that can be used in
139 Local/Makefile (with some defaults set). These are used in built scripts
140 such as exicyclog, but they have never been used in the exim_install
141 script (though there are many overriding facilities there). I have
142 arranged that the exim_install script now takes note of these two
145 PH/35 Installed configuration files for Dragonfly.
147 PH/36 When a locally submitted message by a trusted user did not contain a
148 From: header, and the sender address was obtained from -f or from an SMTP
149 MAIL command, and the trusted user did not use -F to supply a sender
150 name, $originator_name was incorrectly used when constructing a From:
151 header. Furthermore, $originator_name was used for submission mode
152 messages from external hosts without From: headers in a similar way,
153 which is clearly wrong.
155 PH/37 Added control=suppress_local_fixups.
157 PH/38 When log_selector = +received_sender was set, and the addition of the
158 sender made the log line's construction buffer exactly full, or one byte
159 less than full, an overflow happened when the terminating "\n" was
162 PH/39 Added a new log selector, "unknown_in_list", which provokes a log entry
163 when the result of a list match is failure because a DNS lookup failed.
165 PH/40 RM_COMMAND is now used in the building process.
167 PH/41 Added a "distclean" target to the top-level Makefile; it deletes all
168 the "build-* directories that it finds.
170 PH/42 (But a TF fix): In a domain list, Exim incorrectly matched @[] if the IP
171 address in a domain literal was a prefix of an interface address.
173 PH/43 (Again a TF fix): In the dnslookup router, do not apply widen_domains
174 when verifying a sender address, unless rewrite_headers is false.
176 PH/44 Wrote a long comment about why errors_to addresses are verified as
177 recipients, not senders.
179 TF/01 Add missing LIBS=-lm to OS/Makefile-OpenBSD which was overlooked when
180 the ratelimit ACL was added.
182 PH/45 Added $smtp_command for the full command (cf $smtp_command_argument).
188 TF/01 Added support for Client SMTP Authorization. See NewStuff for details.
190 PH/01 When a transport filter timed out in a pipe delivery, and the pipe
191 command itself ended in error, the underlying message about the transport
192 filter timeout was being overwritten with the pipe command error. Now the
193 underlying error message should be appended to the second error message.
195 TK/01 Fix poll() being unavailable on Mac OSX 10.2.
197 PH/02 Reduce the amount of output that "make" produces by default. Full output
198 can still be requested.
200 PH/03 The warning log line about a condition test deferring for a "warn" verb
201 was being output only once per connection, rather than after each
202 occurrence (because it was using the same function as for successful
203 "warn" verbs). This seems wrong, so I have changed it.
205 TF/02 Two buglets in acl.c which caused Exim to read a few bytes of memory that
206 it should not have, which might have caused a crash in the right
207 circumstances, but probably never did.
209 PH/04 Installed a modified version of Tony Finch's patch to make submission
210 mode fix the return path as well as the Sender: header line, and to
211 add a /name= option so that you can make the user's friendly name appear
214 TF/03 Added the control = fakedefer ACL modifier.
216 TF/04 Added the ratelimit ACL condition. See NewStuff for details. Thanks to
217 Mark Lowes for thorough testing.
219 TK/02 Rewrote SPF support to work with libspf2 versions >1.2.0.
221 TK/03 Merged latest SRS patch from Miles Wilton.
223 PH/05 There's a shambles in IRIX6 - it defines EX_OK in unistd.h which conflicts
224 with the definition in sysexits.h (which is #included earlier).
225 Fortunately, Exim does not actually use EX_OK. The code used to try to
226 preserve the sysexits.h value, by assumimg that macro definitions were
227 scanned for macro replacements. I have been disabused of this notion,
228 so now the code just undefines EX_OK before #including unistd.h.
230 PH/06 There is a timeout for writing blocks of data, set by, e.g. data_timeout
231 in the smtp transport. When a block could not be written in a single
232 write() function, the timeout was being re-applied to each part-write.
233 This seems wrong - if the receiver was accepting one byte at a time it
234 would take for ever. The timeout is now adjusted when this happens. It
235 doesn't have to be particularly precise.
237 TK/04 Added simple SPF lookup method in EXPERIMENTAL_SPF. See NewStuff for
238 details. Thanks to Chris Webb <chris@arachsys.com> for the patch!
240 PH/07 Added "fullpostmaster" verify option, which does a check to <postmaster>
241 without a domain if the check to <postmaster@domain> fails.
243 SC/01 Eximstats: added -xls and the ability to specify output files
244 (patch written by Frank Heydlauf).
246 SC/02 Eximstats: use FileHandles for outputing results.
248 SC/03 Eximstats: allow any combination of xls, txt, and html output.
250 SC/04 Eximstats: fixed display of large numbers with -nvr option
252 SC/05 Eximstats: fixed merging of reports with empty tables.
254 SC/06 Eximstats: added the -include_original_destination flag
256 SC/07 Eximstats: removed tabs and trailing whitespace.
258 TK/05 Malware: Improve on aveserver error handling. Patch from Alex Miller.
260 TK/06 MBOX spool code: Add real "From " MBOX separator line
261 so the .eml file is really in mbox format (even though
262 most programs do not really care). Patch from Alex Miller.
264 TK/07 MBOX spool code: Add X-Envelope-From: and X-Envelope-To: headers.
265 The latter is generated from $received_to and is only set if the
266 message has one envelope recipient. SA can use these headers,
267 obviously out-of-the-box. Patch from Alex Miller.
269 PH/08 The ${def test on a variable was returning false if the variable's
270 value was "0", contrary to what the specification has always said!
271 The result should be true unless the variable is empty.
273 PH/09 The syntax error of a character other than { following "${if
274 def:variable_name" (after optional whitespace) was not being diagnosed.
275 An expansion such as ${if def:sender_ident:{xxx}{yyy}} in which an
276 accidental colon was present, for example, could give incorrect results.
278 PH/10 Tidied the code in a number of places where the st_size field of a stat()
279 result is used (not including appendfile, where other changes are about
282 PH/11 Upgraded appendfile so that quotas larger than 2G are now supported.
283 This involved changing a lot of size variables from int to off_t. It
284 should work with maildirs and everything.
286 TK/08 Apply fix provided by Michael Haardt to prevent deadlock in case of
287 spamd dying while we are connected to it.
289 TF/05 Fixed a ${extract error message typo reported by Jeremy Harris
292 PH/12 Applied Alex Kiernan's patch for the API change for the error callback
293 function for BDB 4.3.
295 PH/13 Changed auto_thaw such that it does not apply to bounce messages.
297 PH/14 Imported PCRE 6.0; this was more than just a trivial operation because
298 the sources for PCRE have been re-arranged and more files are now
301 PH/15 The code I had for printing potentially long long variables in PH/11
302 above was not the best (it lost precision). The length of off_t variables
303 is now inspected at build time, and an appropriate printing format (%ld
304 or %lld) is chosen and #defined by OFF_T_FMT. We also define LONGLONG_T
305 to be "long long int" or "long int". This is needed for the internal
306 formatting function string_vformat().
308 PH/16 Applied Matthew Newton's patch to exicyclog: "If log_file_path is set in
309 the configuration file to be ":syslog", then the script "guesses" where
310 the logs files are, rather than using the compiled in default. In our
311 case the guess is not the same as the compiled default, so the script
312 suddenly stopped working when I started to use syslog. The patch checks
313 to see if log_file_path is "". If so, it attempts to read it from exim
314 with no configuration file to get the compiled in version, before it
315 falls back to the previous guessing code."
317 TK/09 Added "prvs" and "prvscheck" expansion items. These help a lot with
318 implementing BATV in an Exim configuration. See NewStuff for the gory
321 PH/17 Applied Michael Haardt's patch for HP-UX, affecting only the os.h and
322 Makefile that are specific to HP-UX.
324 PH/18 If the "use_postmaster" option was set for a recipient callout together
325 with the "random" option, the postmaster address was used as the MAIL
326 FROM address for the random test, but not for the subsequent recipient
327 test. It is now used for both.
329 PH/19 Applied Michael Haardt's patch to update Sieve to RFC3028bis. "The
330 patch removes a few documentation additions to RFC 3028, because the
331 latest draft now contains them. It adds the new en;ascii-case comparator
332 and a new error check for 8bit text in MIME parts. Comparator and
333 require names are now matched exactly. I enabled the subaddress
334 extension, but it is not well tested yet (read: it works for me)."
336 PH/20 Added macros for time_t as for off_t (see PH/15 above) and used them to
337 rework some of the code of TK/09 above to avoid the hardwired use of
338 "%lld" and "long long". Replaced the call to snprintf() with a call to
341 PH/21 Added some other messages to those in 4.51/PH/42, namely "All relevant MX
342 records point to non-existent hosts", "retry timeout exceeded", and
343 "retry time not reached for any host after a long failure period".
345 PH/22 Fixed some oversights/typos causing bugs when Exim is compiled with
346 experimental DomainKeys support:
348 (1) The filter variables $n0-$n9 and $sn0-$sn9 were broken.
349 (2) On an error such as an illegally used "control", the wrong name for
350 the control was given.
352 These problems did NOT occur unless DomainKeys support was compiled.
354 PH/23 Added daemon_startup_retries and daemon_startup_sleep.
356 PH/24 Added ${if match_ip condition.
358 PH/25 Put debug statements on either side of calls to EXIM_DBOPEN() for hints
359 databases so that it will be absolutely obvious if a crash occurs in the
360 DB library. This is a regular occurrence (often caused by mis-matched
363 PH/26 Insert a lot of missing (void) casts for functions such as chown(),
364 chmod(), fcntl(), sscanf(), and other functions from stdio.h. These were
365 picked up on a user's system that detects such things. There doesn't seem
366 to be a gcc warning option for this - only an attribute that has to be
367 put on the function's prototype. It seems that in Fedora Core 4 they have
368 set this on a number of new functions. No doubt there will be more in due
371 PH/27 If a dnslookup or manualroute router is set with verify=only, it need not
372 specify a transport. However, if an address that was verified by such a
373 router was the subject of a callout, Exim crashed because it tried to
374 read the rcpt_include_affixes from the non-existent transport. Now it
375 just assumes that the setting of that option is false. This bug was
376 introduced by 4.51/PH/31.
378 PH/28 Changed -d+all to exclude +memory, because that information is very
379 rarely of interest, but it makes the output a lot bigger. People tend to
380 do -d+all out of habit.
382 PH/29 Removed support for the Linux-libc5 build, as it is obsolete and the
383 code in os-type was giving problems when libc.so lives in lib64, like on
386 PH/30 Exim's DNS code uses the original T_xxx names for DNS record times. These
387 aren't the modern standard, and it seems that some systems' include files
388 don't always have them. Exim was already checking for some of the newer
389 ones like T_AAAA, and defining it itself. I've added checks for all the
390 record types that Exim uses.
392 PH/31 When using GnuTLS, if the parameters cache file did not exist, Exim was
393 not automatically generating a new one, as it is supposed to. This
394 prevented TLS from working. If the file did exist, but contained invalid
395 data, a new version was generated, as expected. It was only the case of a
396 non-existent file that was broken.
398 TK/10 Domainkeys: Fix a bug in verification that caused a crash in conjunction
399 with a change in libdomainkeys > 0.64.
401 TK/11 Domainkeys: Change the logic how the "testing" policy flag is retrieved
402 from DNS. If the selector record carries the flag, it now has
403 precedence over the domain-wide flag.
405 TK/12 Cleared some compiler warnings related to SPF, SRS and DK code.
407 PH/32 In mua_wrapper mode, if an smtp transport configuration error (such as
408 the use of a port name that isn't defined in /etc/services) occurred, the
409 message was deferred as in a normal delivery, and thus remained on the
410 spool, instead of being failed because of the mua_wrapper setting. This
411 is now fixed, and I tidied up some of the mua_wrapper messages at the
414 SC/08 Eximstats: whilst parsing the mainlog(s), store information about
415 the messages in a hash of arrays rather than using individual hashes.
416 This is a bit cleaner and results in dramatic memory savings, albeit
417 at a slight CPU cost.
419 SC/09 Eximstats: added the -show_rt<list> and the -show_dt<list> flags
420 as requested by Marc Sherman.
422 SC/10 Eximstats: added histograms for user specified patterns as requested
425 SC/11 Eximstats: v1.43 - bugfix for pattern histograms with -h0 specified.
427 PH/33 Patch from the Cygwin maintainer to add "b" to all occurences of
428 fopen() in the content-scanning modules that did not already have it.
434 TK/01 Added Yahoo DomainKeys support via libdomainkeys. See
435 doc/experimental-spec.txt for details. (http://domainkeys.sf.net)
437 TK/02 Fix ACL "control" statement not being available in MIME ACL.
439 TK/03 Fix ACL "regex" condition not being available in MIME ACL.
441 PH/01 Installed a patch from the Sieve maintainer that allows -bf to be used
442 to test Sieve filters that use "vacation".
444 PH/02 Installed a slightly modified version of Nikos Mavrogiannopoulos' patch
445 that changes the way the GnuTLS parameters are stored in the cache file.
446 The new format can be generated externally. For backward compatibility,
447 if the data in the cache doesn't make sense, Exim assumes it has read an
448 old-format file, and it generates new data and writes a new file. This
449 means that you can't go back to an older release without removing the
452 PH/03 A redirect router that has both "unseen" and "one_time" set does not
453 work if there are any delivery delays because "one_time" forces the
454 parent to be marked "delivered", so its unseen clone is never tried
455 again. For this reason, Exim now forbids the simultaneous setting of
458 PH/04 Change 4.11/85 fixed an obscure bug concerned with addresses that are
459 redirected to themselves ("homonym" addresses). Read the long ChangeLog
460 entry if you want to know the details. The fix, however, neglected to
461 consider the case when local delivery batching is involved. The test for
462 "previously delivered" was not happening when checking to see if an
463 address could be batched with a previous (undelivered) one; under
464 certain circumstances this could lead to multiple deliveries to the same
467 PH/05 Renamed the macro SOCKLEN_T as EXIM_SOCKLEN_T because AIX uses SOCKLEN_T
468 in its include files, and this causes problems building Exim.
470 PH/06 A number of "verify =" ACL conditions have no options (e.g. verify =
471 header_syntax) but Exim was just ignoring anything given after a slash.
472 In particular, this caused confusion with an attempt to use "verify =
473 reverse_host_lookup/defer_ok". An error is now given when options are
474 supplied for verify items that do not have them. (Maybe reverse_host_
475 lookup should have a defer_ok option, but that's a different point.)
477 PH/07 Increase the size of the buffer for incoming SMTP commands from 512 (as
478 defined by RFC 821) to 2048, because there were problems with some AUTH
479 commands, and RFC 1869 says the size should be increased for extended
480 SMTP commands that take arguments.
482 PH/08 Added ${dlfunc dynamically loaded function for expansion (code from Tony
485 PH/09 Previously, an attempt to use ${perl when it wasn't compiled gave an
486 "unknown" error; now it says that the functionality isn't in the binary.
488 PH/10 Added a nasty fudge to try to recognize and flatten LDAP passwords in
489 an address' error message when a string expansion fails (syntax or
490 whatever). Otherwise the password may appear in the log. Following change
491 PH/42 below, there is no longer a chance of it appearing in a bounce
494 PH/11 Installed exipick version 20050225.0 from John Jetmore.
496 PH/12 If the last host in a fallback_hosts list was multihomed, only the first
497 of its addresses was ever tried. (Bugzilla bug #2.)
499 PH/13 If "headers_add" in a transport didn't end in a newline, Exim printed
500 the result incorrectly in the debug output. (It correctly added a newline
501 to what was transported.)
503 TF/01 Added $received_time.
505 PH/14 Modified the default configuration to add an acl_smtp_data ACL, with
506 commented out examples of how to interface to a virus scanner and to
507 SpamAssassin. Also added commented examples of av_scanner and
508 spamd_address settings.
510 PH/15 Further to TK/02 and TK/03 above, tidied up the tables of what conditions
511 and controls are allowed in which ACLs. There were a couple of minor
512 errors. Some of the entries in the conditions table (which is a table of
513 where they are NOT allowed) were getting very unwieldy; rewrote them as a
514 negation of where the condition IS allowed.
516 PH/16 Installed updated OS/os.c-cygwin from the Cygwin maintainer.
518 PH/17 The API for radiusclient changed at release 0.4.0. Unfortunately, the
519 header file does not have a version number, so I've had to invent a new
520 value for RADIUS_LIB_TYPE, namely "RADIUSCLIENTNEW" to request the new
521 API. The code is untested by me (my Linux distribution still has 0.3.2 of
522 radiusclient), but it was contributed by a Radius user.
524 PH/18 Installed Lars Mainka's patch for the support of CRL collections in
525 files or directories, for OpenSSL.
527 PH/19 When an Exim process that is running as root has to create an Exim log
528 file, it does so in a subprocess that runs as exim:exim so as to get the
529 ownership right at creation (otherwise, other Exim processes might see
530 the file with the wrong ownership). There was no test for failure of this
531 fork() call, which would lead to the process getting stuck as it waited
532 for a non-existent subprocess. Forks do occasionally fail when resources
533 run out. I reviewed all the other calls to fork(); they all seem to check
536 PH/20 When checking for unexpected SMTP input at connect time (before writing
537 the banner), Exim was not dealing correctly with a non-positive return
538 from the read() function. If the client had disconnected by this time,
539 the result was a log entry for a synchronization error with an empty
540 string after "input=" when read() returned zero. If read() returned -1
541 (an event I could not check), uninitialized data bytes were printed.
542 There were reports of junk text (parts of files, etc) appearing after
545 PH/21 Added acl_not_smtp_mime to allow for MIME scanning for non-SMTP messages.
547 PH/22 Added support for macro redefinition, and (re)definition in between
548 driver and ACL definitions.
550 PH/23 The cyrus_sasl authenticator was expanding server_hostname, but then
551 forgetting to use the resulting value; it was using the unexpanded value.
553 PH/24 The cyrus_sasl authenticator was advertising mechanisms for which it
554 hadn't been configured. The fix is from Juergen Kreileder, who
555 understands it better than I do:
557 "Here's what I see happening with three configured cyrus_sasl
558 authenticators configured (plain, login, cram-md5):
560 On startup auth_cyrus_sasl_init() gets called for each of these.
561 This means three calls to sasl_listmech() without a specified mech_list.
562 => SASL tests which mechs of all available mechs actually work
563 => three warnings about OTP not working
564 => the returned list contains: plain, login, cram-md5, digest-md5, ...
566 With the patch, sasl_listmech() also gets called three times. But now
567 SASL's mech_list option is set to the server_mech specified in the the
568 authenticator. Or in other words, the answer from sasl_listmech()
569 gets limited to just the mech you're testing for (which is different
571 => the return list contains just 'plain' or 'login', 'cram-md5' or
572 nothing depending on the value of ob->server_mech.
574 I've just tested the patch: Authentication still works fine,
575 unavailable mechs specified in the exim configuration are still
576 caught, and the auth.log warnings about OTP are gone."
578 PH/25 When debugging is enabled, the contents of the command line are added
579 to the debugging output, even when log_selector=+arguments is not
582 PH/26 Change scripts/os-type so that when "uname -s" returns just "GNU", the
583 answer is "GNU", and only if the return is "GNU/something" is the answer
586 PH/27 $acl_verify_message is now set immediately after the failure of a
587 verification in an ACL, and so is available in subsequent modifiers. In
588 particular, the message can be preserved by coding like this:
590 warn !verify = sender
591 set acl_m0 = $acl_verify_message
593 Previously, $acl_verify_message was set only while expanding "message"
594 and "log_message" when a very denied access.
596 PH/28 Modified OS/os.c-Linux with
598 -#ifndef OS_LOAD_AVERAGE
599 +#if !defined(OS_LOAD_AVERAGE) && defined(__linux__)
601 to make Exim compile on kfreebsd-gnu. (I'm totally confused about the
602 nomenclature these days.)
604 PH/29 Installed patch from the Sieve maintainer that adds the options
605 sieve_useraddress and sieve_subaddress to the redirect router.
607 PH/30 In these circumstances:
608 . Two addresses routed to the same list of hosts;
609 . First host does not offer TLS;
610 . First host accepts first address;
611 . First host gives temporary error to second address;
612 . Second host offers TLS and a TLS session is established;
613 . Second host accepts second address.
614 Exim incorrectly logged both deliveries with the TLS parameters (cipher
615 and peerdn, if requested) that were in fact used only for the second
618 PH/31 When doing a callout as part of verifying an address, Exim was not paying
619 attention to any local part prefix or suffix that was matched by the
620 router that accepted the address. It now behaves in the same way as it
621 does for delivery: the affixes are removed from the local part unless
622 rcpt_include_affixes is set on the transport.
624 PH/32 Add the sender address, as F=<...>, to the log line when logging a
625 timeout during the DATA phase of an incoming message.
627 PH/33 Sieve envelope tests were broken for match types other than :is. I have
628 applied a patch sanctioned by the Sieve maintainer.
630 PH/34 Change 4.50/80 broke Exim in that it could no longer handle cases where
631 the uid or gid is negative. A case of a negative gid caused this to be
632 noticed. The fix allows for either to be negative.
634 PH/35 ACL_WHERE_MIME is now declared unconditionally, to avoid too much code
635 clutter, but the tables that are indexed by ACL_WHERE_xxx values had been
638 PH/36 The change PH/12 above was broken. Fixed it.
640 PH/37 Exim used to check for duplicate addresses in the middle of routing, on
641 the grounds that routing the same address twice would always produce the
642 same answer. This might have been true once, but it is certainly no
643 longer true now. Routing a child address may depend on the previous
644 routing that produced that child. Some complicated redirection strategies
645 went wrong when messages had multiple recipients, and made Exim's
646 behaviour dependent on the order in which the addresses were given.
648 I have moved the duplicate checking until after the routing is complete.
649 Exim scans the addresses that are assigned to local and remote
650 transports, and removes any duplicates. This means that more work will be
651 done, as duplicates will always all be routed, but duplicates are
652 presumably rare, so I don't expect this is of any significance.
654 For deliveries to pipes, files, and autoreplies, the duplicate checking
655 still happens during the routing process, since they are not going to be
658 PH/38 Installed a patch from Ian Freislich, with the agreement of Tom Kistner.
659 It corrects a timeout issue with spamd. This is Ian's comment: "The
660 background is that sometimes spamd either never reads data from a
661 connection it has accepted, or it never writes response data. The exiscan
662 spam.[ch] uses a 3600 second timeout on spamd socket reads, further, it
663 blindly assumes that writes won't block so it may never time out."
665 PH/39 Allow G after quota size as well as K and M.
667 PH/40 The value set for $authenticated_id in an authenticator may not contain
668 binary zeroes or newlines because the value is written to log lines and
669 to spool files. There was no check on this. Now the value is run through
670 the string_printing() function so that such characters are converted to
671 printable escape sequences.
673 PH/41 $message_linecount is a new variable that contains the total number of
674 lines in the message. Compare $body_linecount, which is the count for the
677 PH/42 Exim no longer gives details of delivery errors for specific addresses in
678 bounce and delay warning messages, except in certain special cases, which
681 (a) An SMTP error message from a remote host;
682 (b) A message specified in a :fail: redirection;
683 (c) A message specified in a "fail" command in a system filter;
684 (d) A message specified in a FAIL return from the queryprogram router;
685 (e) A message specified by the cannot_route_message router option.
687 In these cases only, Exim does include the error details in bounce and
688 warning messages. There are also a few cases where bland messages such
689 as "unrouteable address" or "local delivery error" are given.
691 PH/43 $value is now also set for the "else" part of a ${run expansion.
693 PH/44 Applied patch from the Sieve maintainer: "The vacation draft is still
694 being worked on, but at least Exim now implements the latest version to
697 PH/45 In a pipe transport, although a timeout while waiting for the pipe
698 process to complete was treated as a delivery failure, a timeout while
699 writing the message to the pipe was logged, but erroneously treated as a
700 successful delivery. Such timeouts include transport filter timeouts. For
701 consistency with the overall process timeout, these timeouts are now
702 treated as errors, giving rise to delivery failures by default. However,
703 there is now a new Boolean option for the pipe transport called
704 timeout_defer, which, if set TRUE, converts the failures into defers for
705 both kinds of timeout. A transport filter timeout is now identified in
708 PH/46 The "scripts/Configure-config.h" script calls "make" at one point. On
709 systems where "make" and "gmake" are different, calling "gmake" at top
710 level broke things. I've arranged for the value of $(MAKE) to be passed
711 from the Makefile to this script so that it can call the same version of
715 A note about Exim versions 4.44 and 4.50
716 ----------------------------------------
718 Exim 4.50 was meant to be the next release after 4.43. It contains a lot of
719 changes of various kinds. As a consequence, a big documentation update was
720 needed. This delayed the release for rather longer than seemed good, especially
721 in the light of a couple of (minor) security issues. Therefore, the changes
722 that fixed bugs were backported into 4.43, to create a 4.44 maintenance
723 release. So 4.44 and 4.50 are in effect two different branches that both start
726 I have left the 4.50 change log unchanged; it contains all the changes since
727 4.43. The change log for 4.44 is below; many of its items are identical to
728 those for 4.50. This seems to be the most sensible way to preserve the
729 historical information.
735 1. Minor wording change to the doc/README.SIEVE file.
737 2. Change 4.43/35 introduced a bug: if quota_filecount was set, the
738 computation of the current number of files was incorrect.
740 3. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
741 bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
744 4. Give more explanation in the error message when the command for a transport
745 filter fails to execute.
747 5. There are several places where Exim runs a non-Exim command in a
748 subprocess. The SIGUSR1 signal should be disabled for these processes. This
749 was being done only for the command run by the queryprogram router. It is
750 now done for all such subprocesses. The other cases are: ${run, transport
751 filters, and the commands run by the lmtp and pipe transports.
753 6. Added CONFIGURE_GROUP build-time option.
755 7. Some older OS have a limit of 256 on the maximum number of file
756 descriptors. Exim was using setrlimit() to set 1000 as a large value
757 unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
758 systems. I've change it so that if it can't get 1000, it tries for 256.
760 8. "control=submission" was allowed, but had no effect, in a DATA ACL. This
761 was an oversight, and furthermore, ever since the addition of extra
762 controls (e.g. 4.43/32), the checks on when to allow different forms of
763 "control" were broken. There should now be diagnostics for all cases when a
764 control that does not make sense is encountered.
766 9. Added the /retain_sender option to "control=submission".
768 10. $recipients is now available in the predata ACL (oversight).
770 11. Tidy the search cache before the fork to do a delivery from a message
771 received from the command line. Otherwise the child will trigger a lookup
772 failure and thereby defer the delivery if it tries to use (for example) a
773 cached ldap connection that the parent has called unbind on.
775 12. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
776 of $address_data from the recipient verification was clobbered by the
779 13. The value of address_data from a sender verification is now available in
780 $sender_address_data in subsequent conditions in the ACL statement.
782 14. Added forbid_sieve_filter and forbid_exim_filter to the redirect router.
784 15. Added a new option "connect=<time>" to callout options, to set a different
787 16. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
788 was its contents. (It was OK if the option was not defined at all.)
790 17. A "Completed" log line is now written for messages that are removed from
791 the spool by the -Mrm option.
793 18. New variables $sender_verify_failure and $recipient_verify_failure contain
794 information about exactly what failed.
796 19. Added -dd to debug only the daemon process.
798 20. Incorporated Michael Haardt's patch to ldap.c for improving the way it
799 handles timeouts, both on the server side and network timeouts. Renamed the
800 CONNECT parameter as NETTIMEOUT (but kept the old name for compatibility).
802 21. The rare case of EHLO->STARTTLS->HELO was setting the protocol to "smtp".
803 It is now set to "smtps".
805 22. $host_address is now set to the target address during the checking of
808 23. When checking ignore_target_hosts for an ipliteral router, no host name was
809 being passed; this would have caused $sender_host_name to have been used if
810 matching the list had actually called for a host name (not very likely,
811 since this list is usually IP addresses). A host name is now passed as
814 24. Changed the calls that set up the SIGCHLD handler in the daemon to use the
815 code that specifies a non-restarting handler (typically sigaction() in
816 modern systems) in an attempt to fix a rare and obscure crash bug.
818 25. Narrowed the window for a race in the daemon that could cause it to ignore
819 SIGCHLD signals. This is not a major problem, because they are used only to
820 wake it up if nothing else does.
822 26. A malformed maildirsize file could cause Exim to calculate negative values
823 for the mailbox size or file count. Odd effects could occur as a result.
824 The maildirsize information is now recalculated if the size or filecount
827 27. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
828 support for a long time. Removed HAVE_SYS_VFS_H.
830 28. Installed the latest version of exipick from John Jetmore.
832 29. In an address list, if the pattern was not a regular expression, an empty
833 subject address (from a bounce message) matched only if the pattern was an
834 empty string. Non-empty patterns were not even tested. This was the wrong
835 because it is perfectly reasonable to use an empty address as part of a
836 database query. An empty address is now tested by patterns that are
837 lookups. However, all the other forms of pattern expect the subject to
838 contain a local part and a domain, and therefore, for them, an empty
839 address still always fails if the pattern is not itself empty.
841 30. Exim went into a mad DNS loop when attempting to do a callout where the
842 host was specified on an smtp transport, and looking it up yielded more
845 31. Re-factored the code for checking spool and log partition space into a
846 function that finds that data and another that does the check. The former
847 is then used to implement four new variables: $spool_space, $log_space,
848 $spool_inodes, and $log_inodes.
850 32. The RFC2047 encoding function was originally intended for short strings
851 such as real names; it was not keeping to the 75-character limit for
852 encoded words that the RFC imposes. It now respects the limit, and
853 generates multiple encoded words if necessary. To be on the safe side, I
854 have increased the buffer size for the ${rfc2047: expansion operator from
857 33. It is now permitted to omit both strings after an "if" condition; if the
858 condition is true, the result is "true". As before, when the second string
859 is omitted, a false condition yields an empty string. This makes it less
860 cumbersome to write custom ACL and router conditions.
862 34. Failure to deliver a bounce message always caused it to be frozen, even if
863 there was an errors_to setting on the router. The errors_to setting is now
866 35. If an IPv6 address is given for -bh or -bhc, it is now converted to the
867 canonical form (fully expanded) before being placed in
868 $sender_host_address.
870 36. The table in the code that translates DNS record types into text (T_A to
871 "A" for instance) was missing entries for NS and CNAME. It is just possible
872 that this could have caused confusion if both these types were looked up
873 for the same domain, because the text type is used as part of Exim's
874 per-process caching. But the chance of anyone hitting this buglet seems
877 37. The dnsdb lookup has been extended in a number of ways.
879 (1) There is a new type, "zns", which walks up the domain tree until it
880 finds some nameserver records. It should be used with care.
882 (2) There is a new type, "mxh", which is like "mx" except that it returns
883 just the host names, not the priorities.
885 (3) It is now possible to give a list of domains (or IP addresses) to be
886 looked up. The behaviour when one of the lookups defers can be
887 controlled by a keyword.
889 (4) It is now possible to specify the separator character for use when
890 multiple records are returned.
892 38. The dnslists ACL condition has been extended: it is now possible to supply
893 a list of IP addresses and/or domains to be looked up in a particular DNS
896 39. Added log_selector=+queue_time_overall.
898 40. When running the queue in the test harness, wait just a tad after forking a
899 delivery process, to get repeatability of debugging output.
901 41. Include certificate and key file names in error message when GnuTLS fails
902 to set them up, because the GnuTLS error message doesn't include the name
903 of the failing file when there is a problem reading it.
905 42. Allow both -bf and -bF in the same test run.
907 43. Did the same fix as 41 above for OpenSSL, which had the same infelicity.
909 44. The "Exiscan patch" is now merged into the mainline Exim source.
911 45. Sometimes the final signoff response after QUIT could fail to get
912 transmitted in the non-TLS case. Testing !tls_active instead of tls_active
913 < 0 before doing a fflush(). This bug looks as though it goes back to the
914 introduction of TLS in release 3.20, but "sometimes" must have been rare
915 because the tests only now provoked it.
917 46. Reset the locale to "C" after calling embedded Perl, in case it was changed
918 (this can affect the format of dates).
920 47. exim_tidydb, when checking for the continued existence of a message for
921 which it has found a message-specific retry record, was not finding
922 messages that were in split spool directories. Consequently, it was
923 deleting retry records that should have stayed in existence.
925 48. Steve fixed some bugs in eximstats.
927 49. The SPA authentication driver was not abandoning authentication and moving
928 on to the next authenticator when an expansion was forced to fail,
929 contradicting the general specification for all authenticators. Instead it
930 was generating a temporary error. It now behaves as specified.
932 50. The default ordering of permitted cipher suites for GnuTLS was pessimal
933 (the order specifies the preference for clients). The order is now AES256,
934 AES128, 3DES, ARCFOUR128.
936 51. Small patch to Sieve code - explicitly set From: when generating an
939 52. Exim crashed if a remote delivery caused a very long error message to be
940 recorded - for instance if somebody sent an entire SpamAssassin report back
941 as a large number of 550 error lines. This bug was coincidentally fixed by
942 increasing the size of one of Exim's internal buffers (big_buffer) that
943 happened as part of the Exiscan merge. However, to be on the safe side, I
944 have made the code more robust (and fixed the comments that describe what
947 53. Now that there can be additional text after "Completed" in log lines (if
948 the queue_time_overall log selector is set), a one-byte patch to exigrep
949 was needed to allow it to recognize "Completed" as not the last thing in
952 54. The LDAP lookup was not handling a return of LDAP_RES_SEARCH_REFERENCE. A
953 patch that reportedly fixes this has been added. I am not expert enough to
954 create a test for it. This is what the patch creator wrote:
956 "I found a little strange behaviour of ldap code when working with
957 Windows 2003 AD Domain, where users was placed in more than one
958 Organization Units. When I tried to give exim partial DN, the exit code
959 of ldap_search was unknown to exim because of LDAP_RES_SEARCH_REFERENCE.
960 But simultaneously result of request was absolutely normal ldap result,
961 so I produce this patch..."
963 Later: it seems that not all versions of LDAP support LDAP_RES_SEARCH_
964 REFERENCE, so I have modified the code to exclude the patch when that macro
967 55. Some experimental protocols are using DNS PTR records for new purposes. The
968 keys for these records are domain names, not reversed IP addresses. The
969 dnsdb PTR lookup now tests whether its key is an IP address. If not, it
970 leaves it alone. Component reversal etc. now happens only for IP addresses.
973 56. Improve error message when ldap_search() fails in OpenLDAP or Solaris LDAP.
975 57. Double the size of the debug message buffer (to 2048) so that more of very
976 long debug lines gets shown.
978 58. The exicyclog utility now does better if the number of log files to keep
979 exceeds 99. In this case, it numbers them 001, 002 ... instead of 01, 02...
981 59. Two changes related to the smtp_active_hostname option:
983 (1) $smtp_active_hostname is now available as a variable.
984 (2) The default for smtp_banner uses $smtp_active_hostname instead
985 of $primary_hostname.
987 60. The host_aton() function is supposed to be passed a string that is known
988 to be a valid IP address. However, in the case of IPv6 addresses, it was
989 not checking this. This is a hostage to fortune. Exim now panics and dies
990 if the condition is not met. A case was found where this could be provoked
991 from a dnsdb PTR lookup with an IPv6 address that had more than 8
992 components; fortuitously, this particular loophole had already been fixed
993 by change 4.50/55 above.
995 If there are any other similar loopholes, the new check in host_aton()
996 itself should stop them being exploited. The report I received stated that
997 data on the command line could provoke the exploit when Exim was running as
998 exim, but did not say which command line option was involved. All I could
999 find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
1000 running as the user.
1003 61. There was a buffer overflow vulnerability in the SPA authentication code
1004 (which came originally from the Samba project). I have added a test to the
1005 spa_base64_to_bits() function which I hope fixes it.
1008 62. Configuration update for GNU/Hurd and variations. Updated Makefile-GNU and
1009 os.h-GNU, and added configuration files for GNUkFreeBSD and GNUkNetBSD.
1011 63. The daemon start-up calls getloadavg() while still root for those OS that
1012 need the first call to be done as root, but it missed one case: when
1013 deliver_queue_load_max is set with deliver_drop_privilege. This is
1014 necessary for the benefit of the queue runner, because there is no re-exec
1015 when deliver_drop_privilege is set.
1017 64. A call to exiwhat cut short delays set up by "delay" modifiers in ACLs.
1018 This has been fixed.
1020 65. Caching of lookup data for "hosts =" ACL conditions, when a named host list
1021 was in use, was not putting the data itself into the right store pool;
1022 consequently, it could be overwritten for a subsequent message in the same
1023 SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
1026 66. Added hosts_max_try_hardlimit to the smtp transport, default 50.
1028 67. The string_is_ip_address() function returns 0, 4, or 6, for "no an IP
1029 address", "IPv4 address", and "IPv6 address", respectively. Some calls of
1030 the function were treating the return as a boolean value, which happened to
1031 work because 0=false and not-0=true, but is not correct code.
1033 68. The host_aton() function was not handling scoped IPv6 addresses (those
1034 with, for example, "%eth0" on the end) correctly.
1036 69. Fixed some compiler warnings in acl.c for the bitmaps specified with
1037 negated items (that is, ~something) in unsigned ints. Some compilers
1038 apparently mutter when there is no cast.
1040 70. If an address verification called from an ACL failed, and did not produce a
1041 user-specific message (i.e. there was only a "system" message), nothing was
1042 put in $acl_verify_message. In this situation, it now puts the system
1045 71. Change 4.23/11 added synchronization checking at the start of an SMTP
1046 session; change 4.31/43 added the unwanted input to the log line - except
1047 that it did not do this in the start of session case. It now does.
1049 72. After a timeout in a callout SMTP session, Exim still sent a QUIT command.
1050 This is wrong and can cause the other end to generate a synchronization
1051 error if it is another Exim or anything else that does the synchronization
1052 check. A QUIT command is no longer sent after a timeout.
1054 73. $host_lookup_deferred has been added, to make it easier to detect DEFERs
1055 during host lookups.
1057 74. The defer_ok option of callout verification was not working if it was used
1058 when verifying addresses in header lines, that is, for this case:
1060 verify = header_sender/callout=defer_ok
1062 75. A backgrounded daemon closed stdin/stdout/stderr on entry; this meant that
1063 those file descriptors could be used for SMTP connections. If anything
1064 wrote to stderr (the example that came up was "warn" in embedded Perl), it
1065 could be sent to the SMTP client, causing chaos. The daemon now opens
1066 stdin, stdout, and stderr to /dev/null when it puts itself into the
1069 76. Arrange for output from Perl's "warn" command to be written to Exim's main
1070 log by default. The user can override this with suitable Perl magic.
1072 77. The use of log_message on a "discard" ACL verb, which is supposed to add to
1073 the log message when discard triggers, was not working for the DATA ACL or
1074 for the non-SMTP ACL.
1076 78. Error message wording change in sieve.c.
1078 79. If smtp_accept_max_per_host was set, the number of connections could be
1079 restricted to fewer than expected, because the daemon was trying to set up
1080 a new connection before checking whether the processes handling previous
1081 connections had finished. The check for completed processes is now done
1082 earlier. On busy systems, this bug wouldn't be noticed because something
1083 else would have woken the daemon, and it would have reaped the completed
1086 80. If a message was submitted locally by a user whose login name contained one
1087 or more spaces (ugh!), the spool file that Exim wrote was not re-readable.
1088 It caused a spool format error. I have fixed the spool reading code. A
1089 related problem was that the "from" clause in the Received: line became
1090 illegal because of the space(s). It is now covered by ${quote_local_part.
1092 81. Included the latest eximstats from Steve (adds average sizes to HTML Top
1095 82. Updated OS/Makefile-AIX as per message from Mike Meredith.
1097 83. Patch from Sieve maintainer to fix unterminated string problem in
1098 "vacation" handling.
1100 84. Some minor changes to the Linux configuration files to help with other
1101 OS variants using glibc.
1103 85. One more patch for Sieve to update vacation handling to latest spec.
1106 ----------------------------------------------------
1107 See the note above about the 4.44 and 4.50 releases.
1108 ----------------------------------------------------
1114 1. Change 4.43/35 introduced a bug that caused file counts to be
1115 incorrectly computed when quota_filecount was set in an appendfile
1118 2. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
1119 bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
1122 3. Give more explanation in the error message when the command for a transport
1123 filter fails to execute.
1125 4. There are several places where Exim runs a non-Exim command in a
1126 subprocess. The SIGUSR1 signal should be disabled for these processes. This
1127 was being done only for the command run by the queryprogram router. It is
1128 now done for all such subprocesses. The other cases are: ${run, transport
1129 filters, and the commands run by the lmtp and pipe transports.
1131 5. Some older OS have a limit of 256 on the maximum number of file
1132 descriptors. Exim was using setrlimit() to set 1000 as a large value
1133 unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
1134 systems. I've change it so that if it can't get 1000, it tries for 256.
1136 6. "control=submission" was allowed, but had no effect, in a DATA ACL. This
1137 was an oversight, and furthermore, ever since the addition of extra
1138 controls (e.g. 4.43/32), the checks on when to allow different forms of
1139 "control" were broken. There should now be diagnostics for all cases when a
1140 control that does not make sense is encountered.
1142 7. $recipients is now available in the predata ACL (oversight).
1144 8. Tidy the search cache before the fork to do a delivery from a message
1145 received from the command line. Otherwise the child will trigger a lookup
1146 failure and thereby defer the delivery if it tries to use (for example) a
1147 cached ldap connection that the parent has called unbind on.
1149 9. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
1150 of $address_data from the recipient verification was clobbered by the
1151 sender verification.
1153 10. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
1154 was its contents. (It was OK if the option was not defined at all.)
1156 11. A "Completed" log line is now written for messages that are removed from
1157 the spool by the -Mrm option.
1159 12. $host_address is now set to the target address during the checking of
1160 ignore_target_hosts.
1162 13. When checking ignore_target_hosts for an ipliteral router, no host name was
1163 being passed; this would have caused $sender_host_name to have been used if
1164 matching the list had actually called for a host name (not very likely,
1165 since this list is usually IP addresses). A host name is now passed as
1168 14. Changed the calls that set up the SIGCHLD handler in the daemon to use the
1169 code that specifies a non-restarting handler (typically sigaction() in
1170 modern systems) in an attempt to fix a rare and obscure crash bug.
1172 15. Narrowed the window for a race in the daemon that could cause it to ignore
1173 SIGCHLD signals. This is not a major problem, because they are used only to
1174 wake it up if nothing else does.
1176 16. A malformed maildirsize file could cause Exim to calculate negative values
1177 for the mailbox size or file count. Odd effects could occur as a result.
1178 The maildirsize information is now recalculated if the size or filecount
1181 17. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
1182 support for a long time. Removed HAVE_SYS_VFS_H.
1184 18. Updated exipick to current release from John Jetmore.
1186 19. Allow an empty sender to be matched against a lookup in an address list.
1187 Previously the only cases considered were a regular expression, or an
1190 20. Exim went into a mad DNS lookup loop when doing a callout where the
1191 host was specified on the transport, if the DNS lookup yielded more than
1194 21. The RFC2047 encoding function was originally intended for short strings
1195 such as real names; it was not keeping to the 75-character limit for
1196 encoded words that the RFC imposes. It now respects the limit, and
1197 generates multiple encoded words if necessary. To be on the safe side, I
1198 have increased the buffer size for the ${rfc2047: expansion operator from
1201 22. Failure to deliver a bounce message always caused it to be frozen, even if
1202 there was an errors_to setting on the router. The errors_to setting is now
1205 23. If an IPv6 address is given for -bh or -bhc, it is now converted to the
1206 canonical form (fully expanded) before being placed in
1207 $sender_host_address.
1209 24. Updated eximstats to version 1.33
1211 25. Include certificate and key file names in error message when GnuTLS fails
1212 to set them up, because the GnuTLS error message doesn't include the name
1213 of the failing file when there is a problem reading it.
1215 26. Expand error message when OpenSSL has problems setting up cert/key files.
1218 27. Reset the locale to "C" after calling embedded Perl, in case it was changed
1219 (this can affect the format of dates).
1221 28. exim_tidydb, when checking for the continued existence of a message for
1222 which it has found a message-specific retry record, was not finding
1223 messages that were in split spool directories. Consequently, it was
1224 deleting retry records that should have stayed in existence.
1226 29. eximstats updated to version 1.35
1227 1.34 - allow eximstats to parse syslog lines as well as mainlog lines
1228 1.35 - bugfix such that pie charts by volume are generated correctly
1230 30. The SPA authentication driver was not abandoning authentication and moving
1231 on to the next authenticator when an expansion was forced to fail,
1232 contradicting the general specification for all authenticators. Instead it
1233 was generating a temporary error. It now behaves as specified.
1235 31. The default ordering of permitted cipher suites for GnuTLS was pessimal
1236 (the order specifies the preference for clients). The order is now AES256,
1237 AES128, 3DES, ARCFOUR128.
1239 31. Small patch to Sieve code - explicitly set From: when generating an
1242 32. Exim crashed if a remote delivery caused a very long error message to be
1243 recorded - for instance if somebody sent an entire SpamAssassin report back
1244 as a large number of 550 error lines. This bug was coincidentally fixed by
1245 increasing the size of one of Exim's internal buffers (big_buffer) that
1246 happened as part of the Exiscan merge. However, to be on the safe side, I
1247 have made the code more robust (and fixed the comments that describe what
1250 33. Some experimental protocols are using DNS PTR records for new purposes. The
1251 keys for these records are domain names, not reversed IP addresses. The
1252 dnsdb PTR lookup now tests whether its key is an IP address. If not, it
1253 leaves it alone. Component reversal etc. now happens only for IP addresses.
1256 34. The host_aton() function is supposed to be passed a string that is known
1257 to be a valid IP address. However, in the case of IPv6 addresses, it was
1258 not checking this. This is a hostage to fortune. Exim now panics and dies
1259 if the condition is not met. A case was found where this could be provoked
1260 from a dnsdb PTR lookup with an IPv6 address that had more than 8
1261 components; fortuitously, this particular loophole had already been fixed
1262 by change 4.50/55 or 4.44/33 above.
1264 If there are any other similar loopholes, the new check in host_aton()
1265 itself should stop them being exploited. The report I received stated that
1266 data on the command line could provoke the exploit when Exim was running as
1267 exim, but did not say which command line option was involved. All I could
1268 find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
1269 running as the user.
1272 35. There was a buffer overflow vulnerability in the SPA authentication code
1273 (which came originally from the Samba project). I have added a test to the
1274 spa_base64_to_bits() function which I hope fixes it.
1277 36. The daemon start-up calls getloadavg() while still root for those OS that
1278 need the first call to be done as root, but it missed one case: when
1279 deliver_queue_load_max is set with deliver_drop_privilege. This is
1280 necessary for the benefit of the queue runner, because there is no re-exec
1281 when deliver_drop_privilege is set.
1283 37. Caching of lookup data for "hosts =" ACL conditions, when a named host list
1284 was in use, was not putting the data itself into the right store pool;
1285 consequently, it could be overwritten for a subsequent message in the same
1286 SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
1289 38. Sometimes the final signoff response after QUIT could fail to get
1290 transmitted in the non-TLS case. Testing !tls_active instead of tls_active
1291 < 0 before doing a fflush(). This bug looks as though it goes back to the
1292 introduction of TLS in release 3.20, but "sometimes" must have been rare
1293 because the tests only now provoked it.
1299 1. Fixed a longstanding but relatively impotent bug: a long time ago, before
1300 PIPELINING, the function smtp_write_command() used to return TRUE or FALSE.
1301 Now it returns an integer. A number of calls were still expecting a T/F
1302 return. Fortuitously, in all cases, the tests worked in OK situations,
1303 which is the norm. However, things would have gone wrong on any write
1304 failures on the smtp file descriptor. This function is used when sending
1305 messages over SMTP and also when doing verify callouts.
1307 2. When Exim is called to do synchronous delivery of a locally submitted
1308 message (the -odf or -odi options), it no longer closes stderr before doing
1311 3. Implemented the mua_wrapper option.
1313 4. Implemented mx_fail_domains and srv_fail_domains for the dnslookup router.
1315 5. Implemented the functions header_remove(), header_testname(),
1316 header_add_at_position(), and receive_remove_recipient(), and exported them
1319 6. If an ACL "warn" statement specified the addition of headers, Exim already
1320 inserted X-ACL-Warn: at the start if there was no header name. However, it
1321 was not making this test for the second and subsequent header lines if
1322 there were newlines in the string. This meant that an invalid header could
1323 be inserted if Exim was badly configured.
1325 7. Allow an ACL "warn" statement to add header lines at the start or after all
1326 the Received: headers, as well as at the end.
1328 8. Added the rcpt_4xx retry error code.
1330 9. Added postmaster_mailfrom=xxx to callout verification option.
1332 10. Added mailfrom=xxxx to the callout verification option, for verify=
1335 11. ${substr_1_:xxxx} and ${substr__3:xxxx} are now diagnosed as syntax errors
1336 (they previously behaved as ${substr_1_0:xxxx} and ${substr:_0_3:xxxx}).
1338 12. Inserted some casts to stop certain compilers warning when using pointer
1339 differences as field lengths or precisions in printf-type calls (mostly
1340 affecting debugging statements).
1342 13. Added optional readline() support for -be (dynamically loaded).
1344 14. Obscure bug fix: if a message error (e.g. 4xx to MAIL) happened within the
1345 same clock tick as a message's arrival, so that its received time was the
1346 same as the "first fail" time on the retry record, and that message
1347 remained on the queue past the ultimate address timeout, every queue runner
1348 would try a delivery (because it was past the ultimate address timeout) but
1349 after another failure, the ultimate address timeout, which should have then
1350 bounced the address, did not kick in. This was a "< instead of <=" error;
1351 in most cases the first failure would have been in the next clock tick
1352 after the received time, and all would be well.
1354 15. The special items beginning with @ in domain lists (e.g. @mx_any) were not
1355 being recognized when the domain list was tested by the match_domain
1356 condition in an expansion string.
1358 16. Added the ${str2b64: operator.
1360 17. Exim was always calling setrlimit() to set a large limit for the number of
1361 processes, without checking whether the existing limit was already
1362 adequate. (It did check for the limit on file descriptors.) Furthermore,
1363 errors from getrlimit() and setrlimit() were being ignored. Now they are
1364 logged to the main and panic logs, but Exim does carry on, to try to do its
1365 job under whatever limits there are.
1367 18. Imported PCRE 5.0.
1369 19. Trivial typo in log message " temporarily refused connection" (the leading
1372 20. If the log selector return_path_on_delivery was set and an address was
1373 redirected to /dev/null, the delivery process crashed because it assumed
1374 that a return path would always be set for a "successful" delivery. In this
1375 case, the whole delivery is bypassed as an optimization, and therefore no
1378 21. Internal re-arrangement: the function for sending a challenge and reading
1379 a response while authentication was assuming a zero-terminated challenge
1380 string. It's now changed to take a pointer and a length, to allow for
1381 binary data in such strings.
1383 22. Added the cyrus_sasl authenticator (code supplied by MBM).
1385 23. Exim was not respecting finduser_retries when seeking the login of the
1386 uid under which it was called; it was always trying 10 times. (The default
1387 setting of finduser_retries is zero.) Also, it was sleeping after the final
1388 failure, which is pointless.
1390 24. Implemented tls_on_connect_ports.
1392 25. Implemented acl_smtp_predata.
1394 26. If the domain in control=submission is set empty, Exim assumes that the
1395 authenticated id is a complete email address when it generates From: or
1396 Sender: header lines.
1398 27. Added "#define SOCKLEN_T int" to OS/os.h-SCO and OS/os.h-SCO_SV. Also added
1399 definitions to OS/Makefile-SCO and OS/Makefile-SCO_SV that put basename,
1400 chown and chgrp in /bin and hostname in /usr/bin.
1402 28. Exim was keeping the "process log" file open after each use, just as it
1403 does for the main log. This opens the possibility of it remaining open for
1404 long periods when the USR1 signal hits a daemon. Occasional processlog
1405 errors were reported, that could have been caused by this. Anyway, it seems
1406 much more sensible not to leave this file open at all, so that is what now
1409 29. The long-running daemon process does not normally write to the log once it
1410 has entered its main loop, and it closes the log before doing so. This is
1411 so that log files can straightforwardly be renamed and moved. However,
1412 there are a couple of unusual error situations where the daemon does write
1413 log entries, and I had neglected to close the log afterwards.
1415 30. The text of an SMTP error response that was received during a remote
1416 delivery was being truncated at 512 bytes. This is too short for some of
1417 the long messages that one sometimes sees. I've increased the limit to
1420 31. It is now possible to make retry rules that apply only when a message has a
1421 specific sender, in particular, an empty sender.
1423 32. Added "control = enforce_sync" and "control = no_enforce_sync". This makes
1424 it possible to be selective about when SMTP synchronization is enforced.
1426 33. Added "control = caseful_local_part" and "control = "caselower_local_part".
1428 32. Implemented hosts_connection_nolog.
1430 33. Added an ACL for QUIT.
1432 34. Setting "delay_warning=" to disable warnings was not working; it gave a
1435 35. Added mailbox_size and mailbox_filecount to appendfile.
1437 36. Added control = no_multiline_responses to ACLs.
1439 37. There was a bug in the logic of the code that waits for the clock to tick
1440 in the case where the clock went backwards by a substantial amount such
1441 that the microsecond fraction of "now" was more than the microsecond
1442 fraction of "then" (but the whole seconds number was less).
1444 38. Added support for the libradius Radius client library this is found on
1445 FreeBSD (previously only the radiusclient library was supported).
1451 1. When certain lookups returned multiple values in the form name=value, the
1452 quoting of the values was not always being done properly. Specifically:
1453 (a) If the value started with a double quote, but contained no whitespace,
1455 (b) If the value contained whitespace other than a space character (i.e.
1456 tabs or newlines or carriage returns) it was not quoted.
1457 This fix has been applied to the mysql and pgsql lookups by writing a
1458 separate quoting function and calling it from the lookup code. The fix
1459 should probably also be applied to nisplus, ibase and oracle lookups, but
1460 since I cannot test any of those, I have not disturbed their existing code.
1462 2. A hit in the callout cache for a specific address caused a log line with no
1463 reason for rejecting RCPT. Now it says "Previous (cached) callout
1464 verification failure".
1466 3. There was an off-by-one bug in the queryprogram router. An over-long
1467 return line was truncated at 256 instead of 255 characters, thereby
1468 overflowing its buffer with the terminating zero. As well as fixing this, I
1469 have increased the buffer size to 1024 (and made a note to document this).
1471 4. If an interrupt, such as the USR1 signal that is send by exiwhat, arrives
1472 when Exim is waiting for an SMTP response from a remote server, Exim
1473 restarts its select() call on the socket, thereby resetting its timeout.
1474 This is not a problem when such interrupts are rare. Somebody set up a cron
1475 job to run exiwhat every 2 minutes, which is less than the normal select()
1476 timeout (5 or 10 minutes). This meant that the select() timeout never
1477 kicked in because it was always reset. I have fixed this by comparing the
1478 time when an interrupt arrives with the time at the start of the first call
1479 to select(). If more time than the timeout has elapsed, the interrupt is
1480 treated as a timeout.
1482 5. Some internal re-factoring in preparation for the addition of Sieve
1483 extensions (by MH). In particular, the "personal" test is moved to a
1484 separate function, and given an option for scanning Cc: and Bcc: (which is
1485 not set for Exim filters).
1487 6. When Exim created an email address using the login of the caller as the
1488 local part (e.g. when creating a From: or Sender: header line), it was not
1489 quoting the local part when it contained special characters such as @.
1491 7. Installed new OpenBSD configuration files.
1493 8. Reworded some messages for syntax errors in "and" and "or" conditions to
1494 try to make them clearer.
1496 9. Callout options, other than the timeout value, were being ignored when
1497 verifying sender addresses in header lines. For example, when using
1499 verify = header_sender/callout=no_cache
1501 the cache was (incorrectly) being used.
1503 10. Added a missing instance of ${EXE} to the exim_install script; this affects
1504 only the Cygwin environment.
1506 11. When return_path_on_delivery was set as a log selector, if different remote
1507 addresses in the same message used different return paths and parallel
1508 remote delivery occurred, the wrong values would sometimes be logged.
1509 (Whenever a remote delivery process finished, the return path value from
1510 the most recently started remote delivery process was logged.)
1512 12. RFC 3848 specifies standard names for the "with" phrase in Received: header
1513 lines when AUTH and/or TLS are in use. This is the "received protocol"
1514 field. Exim used to use "asmtp" for authenticated SMTP, without any
1515 indication (in the protocol name) for TLS use. Now it follows the RFC and
1516 uses "esmtpa" if the connection is authenticated, "esmtps" if it is
1517 encrypted, and "esmtpsa" if it is both encrypted and authenticated. These
1518 names appear in log lines as well as in Received: header lines.
1520 13. Installed MH's patches for Sieve to add the "copy" and "vacation"
1521 extensions, and comparison tests, and to fix some bugs.
1523 14. Changes to the "personal" filter test:
1525 (1) The test was buggy in that it was just doing the equivalent of
1526 "contains" tests on header lines. For example, if a user's address was
1527 anne@some.where, the "personal" test would incorrectly be true for
1529 To: susanne@some.where
1531 This test is now done by extracting each address from the header in turn,
1532 and checking the entire address. Other tests that are part of "personal"
1533 are now done using regular expressions (for example, to check local parts
1534 of addresses in From: header lines).
1536 (2) The list of non-personal local parts in From: addresses has been
1537 extended to include "listserv", "majordomo", "*-request", and "owner-*",
1538 taken from the Sieve specification recommendations.
1540 (3) If the message contains any header line starting with "List-" it is
1541 treated as non-personal.
1543 (4) The test for "circular" in the Subject: header line has been removed
1544 because it now seems ill-conceived.
1546 15. Minor typos in src/EDITME comments corrected.
1548 16. Installed latest exipick from John Jetmore.
1550 17. If headers_add on a router specified a text string that was too long for
1551 string_sprintf() - that is, longer than 8192 bytes - Exim panicked. The use
1552 of string_sprintf() is now avoided.
1554 18. $message_body_size was not set (it was always zero) when running the DATA
1555 ACL and the local_scan() function.
1557 19. For the "mail" command in an Exim filter, no default was being set for
1558 the once_repeat time, causing a random time value to be used if "once" was
1559 specified. (If the value happened to be <= 0, no repeat happened.) The
1560 default is now 0s, meaning "never repeat". The "vacation" command was OK
1561 (its default is 7d). It's somewhat surprising nobody ever noticed this bug
1562 (I found it when inspecting the code).
1564 20. There is now an overall timeout for performing a callout verification. It
1565 defaults to 4 times the callout timeout, which applies to individual SMTP
1566 commands during the callout. The overall timeout applies when there is more
1567 than one host that can be tried. The timeout is checked before trying the
1568 next host. This prevents very long delays if there are a large number of
1569 hosts and all are timing out (e.g. when the network connections are timing
1570 out). The value of the overall timeout can be changed by specifying an
1571 additional sub-option for "callout", called "maxwait". For example:
1573 verify = sender/callout=5s,maxwait=20s
1575 21. Add O_APPEND to the open() call for maildirsize files (Exim already seeks
1576 to the end before writing, but this should make it even safer).
1578 22. Exim was forgetting that it had advertised PIPELINING for the second and
1579 subsequent messages on an SMTP connection. It was also not resetting its
1580 memory on STARTTLS and an internal HELO.
1582 23. When Exim logs an SMTP synchronization error within a session, it now
1583 records whether PIPELINING has been advertised or not.
1585 24. Added 3 instances of "(long int)" casts to time_t variables that were being
1586 formatted using %ld, because on OpenBSD (and perhaps others), time_t is int
1587 rather than long int.
1589 25. Installed the latest Cygwin configuration files from the Cygwin maintainer.
1591 26. Added the never_mail option to autoreply.
1597 1. A reorganization of the code in order to implement 4.40/8 caused a daemon
1598 crash if the getsockname() call failed; this can happen if a connection is
1599 closed very soon after it is established. The problem was simply in the
1600 order in which certain operations were done, causing Exim to try to write
1601 to the SMTP stream before it had set up the file descriptor. The bug has
1602 been fixed by making things happen in the correct order.
1608 1. If "drop" was used in a DATA ACL, the SMTP output buffer was not flushed
1609 before the connection was closed, thus losing the rejection response.
1611 2. Commented out the definition of SOCKLEN_T in os.h-SunOS5. It is needed for
1612 some early Solaris releases, but causes trouble in current releases where
1613 socklen_t is defined.
1615 3. When std{in,out,err} are closed, re-open them to /dev/null so that they
1618 4. Minor refactoring of os.c-Linux to avoid compiler warning when IPv6 is not
1621 5. Refactoring in expand.c to improve memory usage. Pre-allocate a block so
1622 that releasing the top of it at the end releases what was used for sub-
1623 expansions (unless the block got too big). However, discard this block if
1624 the first thing is a variable or header, so that we can use its block when
1625 it is dynamic (useful for very large $message_headers, for example).
1627 6. Lookups now cache *every* query, not just the most recent. A new, separate
1628 store pool is used for this. It can be recovered when all lookup caches are
1629 flushed. Lookups now release memory at the end of their result strings.
1630 This has involved some general refactoring of the lookup sources.
1632 7. Some code has been added to the store_xxx() functions to reduce the amount
1633 of flapping under certain conditions.
1635 8. log_incoming_interface used to affect only the <= reception log lines. Now
1636 it causes the local interface and port to be added to several more SMTP log
1637 lines, for example "SMTP connection from", and rejection lines.
1639 9. The Sieve author supplied some patches for the doc/README.SIEVE file.
1641 10. Added a conditional definition of _BSD_SOCKLEN_T to os.h-Darwin.
1643 11. If $host_data was set by virtue of a hosts lookup in an ACL, its value
1644 could be overwritten at the end of the current message (or the start of a
1645 new message if it was set in a HELO ACL). The value is now preserved for
1646 the duration of the SMTP connection.
1648 12. If a transport had a headers_rewrite setting, and a matching header line
1649 contained an unqualified address, that address was qualified, even if it
1650 did not match any rewriting rules. The underlying bug was that the values
1651 of the flags that permit the existence of unqualified sender and recipient
1652 addresses in header lines (set by {sender,recipient}_unqualified_hosts for
1653 non-local messages, and by -bnq for local messages) were not being
1654 preserved with the message after it was received.
1656 13. When Exim was logging an SMTP synchronization error, it could sometimes log
1657 "next input=" as part of the text comprising the host identity instead of
1658 the correct text. The code was using the same buffer for two different
1659 strings. However, depending on which order the printing function evaluated
1660 its arguments, the bug did not always show up. Under Linux, for example, my
1661 test suite worked just fine.
1663 14. Exigrep contained a use of Perl's "our" scoping after change 4.31/70. This
1664 doesn't work with some older versions of Perl. It has been changed to "my",
1665 which in any case is probably the better facility to use.
1667 15. A really picky compiler found some instances of statements for creating
1668 error messages that either had too many or two few arguments for the format
1671 16. The size of the buffer for calls to the DNS resolver has been increased
1672 from 1024 to 2048. A larger buffer is needed when performing PTR lookups
1673 for addresses that have a lot of PTR records. This alleviates a problem; it
1674 does not fully solve it.
1676 17. A dnsdb lookup for PTR records that receives more data than will fit in the
1677 buffer now truncates the list and logs the incident, which is the same
1678 action as happens when Exim is looking up a host name and its aliases.
1679 Previously in this situation something unpredictable would happen;
1680 sometimes it was "internal error: store_reset failed".
1682 18. If a server dropped the connection unexpectedly when an Exim client was
1683 using GnuTLS and trying to read a response, the client delivery process
1684 crashed while trying to generate an error log message.
1686 19. If a "warn" verb in an ACL added multiple headers to a message in a single
1687 string, for example:
1689 warn message = H1: something\nH2: something
1691 the text was added as a single header line from Exim's point of view
1692 though it ended up OK in the delivered message. However, searching for the
1693 second and subsequent header lines using $h_h2: did not work. This has been
1694 fixed. Similarly, if a system filter added multiple headers in this way,
1695 the routers could not see them.
1697 20. Expanded the error message when iplsearch is called with an invalid key to
1698 suggest using net-iplsearch in a host list.
1700 21. When running tests using -bh, any delays imposed by "delay" modifiers in
1701 ACLs are no longer actually imposed (and a message to that effect is
1704 22. If a "gecos" field in a passwd entry contained escaped characters, in
1705 particular, if it contained a \" sequence, Exim got it wrong when building
1706 a From: or a Sender: header from that name. A second bug also caused
1707 incorrect handling when an unquoted " was present following a character
1708 that needed quoting.
1710 23. "{crypt}" as a password encryption mechanism for a "crypteq" expansion item
1711 was not being matched caselessly.
1713 24. Arranged for all hyphens in the exim.8 source to be escaped with
1716 25. Change 16 of 4.32, which reversed 71 or 4.31 didn't quite do the job
1717 properly. Recipient callout cache records were still being keyed to include
1718 the sender, even when use_sender was set false. This led to far more
1719 callouts that were necessary. The sender is no longer included in the key
1720 when use_sender is false.
1722 26. Added "control = submission" modifier to ACLs.
1724 27. Added the ${base62d: operator to decode base 62 numbers.
1726 28. dnsdb lookups can now access SRV records.
1728 29. CONFIGURE_OWNER can be set at build time to define an alternative owner for
1729 the configuration file.
1731 30. The debug message "delivering xxxxxx-xxxxxx-xx" is now output in verbose
1732 (-v) mode. This makes the output for a verbose queue run more intelligible.
1734 31. Added a use_postmaster feature to recipient callouts.
1736 32. Added the $body_zerocount variable, containing the number of binary zero
1737 bytes in the message body.
1739 33. The time of last modification of the "new" subdirectory is now used as the
1740 "mailbox time last read" when there is a quota error for a maildir
1743 34. Added string comparison operators lt, lti, le, lei, gt, gti, ge, gei.
1745 35. Added +ignore_unknown as a special item in host lists.
1747 36. Code for decoding IPv6 addresses in host lists is now included, even if
1748 IPv6 support is not being compiled. This fixes a bug in which an IPv6
1749 address was recognized as an IP address, but was then not correctly decoded
1750 into binary, causing unexpected and incorrect effects when compared with
1757 1. Very minor rewording of debugging text in manualroute to say "list of
1758 hosts" instead of "hostlist".
1760 2. If verify=header_syntax was set, and a header line with an unqualified
1761 address (no domain) and a large number of spaces between the end of the
1762 name and the colon was received, the reception process suffered a buffer
1763 overflow, and (when I tested it) crashed. This was caused by some obsolete
1764 code that should have been removed. The fix is to remove it!
1766 3. When running in the test harness, delay a bit after writing a bounce
1767 message to get a bit more predictability in the log output.
1769 4. Added a call to search_tidyup() just before forking a reception process. In
1770 theory, someone could use a lookup in the expansion of smtp_accept_max_
1771 per_host which, without the tidyup, could leave open a database connection.
1773 5. Added the variables $recipient_data and $sender_data which get set from a
1774 lookup success in an ACL "recipients" or "senders" condition, or a router
1775 "senders" option, similar to $domain_data and $local_part_data.
1777 6. Moved the writing of debug_print from before to after the "senders" test
1780 7. Change 4.31/66 (moving the time when the Received: is generated) caused
1781 problems for message scanning, either using a data ACL, or using
1782 local_scan() because the Received: header was not generated till after they
1783 were called (in order to set the time as the time of reception completion).
1784 I have revised the way this works. The header is now generated after the
1785 body is received, but before the ACL or local_scan() are called. After they
1786 are run, the timestamp in the header is updated.
1792 1. Change 4.24/6 introduced a bug because the SIGALRM handler was disabled
1793 before starting a queue runner without re-exec. This happened only when
1794 deliver_drop_privilege was set or when the Exim user was set to root. The
1795 effect of the bug was that timeouts during subsequent deliveries caused
1796 crashes instead of being properly handled. The handler is now left at its
1797 default (and expected) setting.
1799 2. The other case in which a daemon avoids a re-exec is to deliver an incoming
1800 message, again when deliver_drop_privilege is set or Exim is run as root.
1801 The bug described in (1) was not present in this case, but the tidying up
1802 of the other signals was missing. I have made the two cases consistent.
1804 3. The ignore_target_hosts setting on a manualroute router was being ignored
1805 for hosts that were looked up using the /MX notation.
1807 4. Added /ignore=<ip list> feature to @mx_any, @mx_primary, and @mx_secondary
1810 5. Change 4.31/55 was buggy, and broke when there was a rewriting rule that
1811 operated on the sender address. After changing the $sender_address to <>
1812 for the sender address verify, Exim was re-instated it as the original
1813 (before rewriting) address, but remembering that it had rewritten it, so it
1814 wasn't rewriting it again. This bug also had the effect of breaking the
1815 sender address verification caching when the sender address was rewritten.
1817 6. The ignore_target_hosts option was being ignored by the ipliteral router.
1818 This has been changed so that if the ip literal address matches
1819 ignore_target_hosts, the router declines.
1821 7. Added expansion conditions match_domain, match_address, and match_local_
1822 part (NOT match_host).
1824 8. The placeholder for the Received: header didn't have a length field set.
1826 9. Added code to Exim itself and to exim_lock to test for a specific race
1827 condition that could lead to file corruption when using MBX delivery. The
1828 issue is with the lockfile that is created in /tmp. If this file is removed
1829 after a process has opened it but before that process has acquired a lock,
1830 there is the potential for a second process to recreate the file and also
1831 acquire a lock. This could lead to two Exim processes writing to the file
1832 at the same time. The added code performs the same test as UW imapd; it
1833 checks after acquiring the lock that its file descriptor still refers to
1834 the same named file.
1836 10. The buffer for building added header lines was of fixed size, 8192 bytes.
1837 It is now parameterized by HEADER_ADD_BUFFER_SIZE and this can be adjusted
1840 11. Added the smtp_active_hostname option. If used, this will typically be made
1841 to depend on the incoming interface address. Because $interface_address is
1842 not set up until the daemon has forked a reception process, error responses
1843 that can happen earlier (such as "too many connections") no longer contain
1846 12. If an expansion in a condition on a "warn" statement fails because a lookup
1847 defers, the "warn" statement is abandoned, and the next ACL statement is
1848 processed. Previously this caused the whole ACL to be aborted.
1850 13. Added the iplsearch lookup type.
1852 14. Added ident_timeout as a log selector.
1854 15. Added tls_certificate_verified as a log selector.
1856 16. Added a global option tls_require_ciphers (compare the smtp transport
1857 option of the same name). This controls incoming TLS connections.
1859 17. I finally figured out how to make tls_require_ciphers do a similar thing
1860 in GNUtls to what it does in OpenSSL, that is, set up an appropriate list
1861 before starting the TLS session.
1863 18. Tabs are now shown as \t in -bP output.
1865 19. If the log selector return_path_on_delivery was set, Exim crashed when
1866 bouncing a message because it had too many Received: header lines.
1868 20. If two routers both had headers_remove settings, and the first one included
1869 a superfluous trailing colon, the final name in the first list and the
1870 first name in the second list were incorrectly joined into one item (with a
1871 colon in the middle).
1877 1. Added -C and -D options to the exinext utility, mainly to make it easier
1878 to include in the automated testing, but these could be helpful when
1879 multiple configurations are in use.
1881 2. The exinext utility was not formatting the output nicely when there was
1882 an alternate port involved in the retry record key, nor when there was a
1883 message id as well (for retries that were specific to a specific message
1884 and a specific host). It was also confused by IPv6 addresses, because of
1885 the additional colons they contain. I have fixed the IPv4 problem, and
1886 patched it up to do a reasonable job for IPv6.
1888 3. When there is an error after a MAIL, RCPT, or DATA SMTP command during
1889 delivery, the log line now contains "pipelined" if PIPELINING was used.
1891 4. An SMTP transport process used to panic and die if the bind() call to set
1892 an explicit outgoing interface failed. This has been changed; it is now
1893 treated in the same way as a connect() failure.
1895 5. A reference to $sender_host_name in the part of a conditional expansion
1896 that was being skipped was still causing a DNS lookup. This no longer
1899 6. The def: expansion condition was not recognizing references to header lines
1900 that used bh_ and bheader_.
1902 7. Added the _cache feature to named lists.
1904 8. The code for checking quota_filecount in the appendfile transport was
1905 allowing one more file than it should have been.
1907 9. For compatibility with Sendmail, the command line option
1915 and sets the incoming protocol and host name (for trusted callers). The
1916 host name and its colon can be omitted when only the protocol is to be set.
1917 Note the Exim already has two private options, -pd and -ps, that refer to
1918 embedded Perl. It is therefore impossible to set a protocol value of "d" or
1919 "s", but I don't think that's a major issue.
1921 10. A number of refactoring changes to the code, none of which should affect
1924 (a) The number of logging options was getting close to filling up the
1925 32-bit word that was used as a bit map. I have split them into two classes:
1926 those that are passed in the argument to log_write(), and those that are
1927 only ever tested independently outside of that function. These are now in
1928 separate 32-bit words, so there is plenty of room for expansion again.
1929 There is no change in the user interface or the logging behaviour.
1931 (b) When building, for example, log lines, the code previously used a
1932 macro that called string_cat() twice, in order to add two strings. This is
1933 not really sufficiently general. Furthermore, there was one instance where
1934 it was actually wrong because one of the argument was used twice, and in
1935 one call a function was used. (As it happened, calling the function twice
1936 did not affect the overall behaviour.) The macro has been replaced by a
1937 function that can join an arbitrary number of extra strings onto a growing
1940 (c) The code for expansion conditions now uses a table and a binary chop
1941 instead of a serial search (which was left over from when there were very
1942 few conditions). Also, it now recognizes conditions like "pam" even when
1943 the relevant support is not compiled in: a suitably worded error message is
1944 given if an attempt is made to use such a condition.
1946 11. Added ${time_interval:xxxxx}.
1948 12. A bug was causing one of the ddress fields not to be passed back correctly
1949 from remote delivery subprocesses. The field in question was not being
1950 subsequently used, so this caused to problems in practice.
1952 13. Added new log selectors queue_time and deliver_time.
1954 14. Might have fixed a bug in maildirsizefile handling that threw up
1955 "unexpected character" debug warnings, and recalculated the data
1956 unnecessarily. In any case, I expanded the warning message to give more
1959 15. Added the message "Restricted characters in address" to the statements in
1960 the default ACL that block characters like @ and % in local parts.
1962 16. Change 71 for release 4.31 proved to be much less benign that I imagined.
1963 Three changes have been made:
1965 (a) There was a serious bug; a negative response to MAIL caused the whole
1966 recipient domain to be cached as invalid, thereby blocking all messages
1967 to all local parts at the same domain, from all senders. This bug has
1968 been fixed. The domain is no longer cached after a negative response to
1969 MAIL if the sender used is not empty.
1971 (b) The default behaviour of using MAIL FROM:<> for recipient callouts has
1974 (c) A new callout option, "use_sender" has been added for people who want
1975 the modified behaviour.
1981 1. Removed "EXTRALIBS=-lwrap" from OS/Makefile-Unixware7 on the advice of
1984 2. Removed "LIBS = -lresolv" from OS/Makefile-Darwin as it is not needed, and
1985 indeed breaks things for older releases.
1987 3. Added additional logging to the case where there is a problem reading data
1988 from a filter that is running in a subprocess using a pipe, in order to
1989 try to track down a specific problem.
1991 4. Testing facility fudge: when running in the test harness and attempting
1992 to connect to 10.x.x.x (expecting a connection timeout) I'm now sometimes
1993 getting "No route to host". Convert this to a timeout.
1995 5. Define ICONV_ARG2_TYPE as "char **" for Unixware7 to avoid compiler
1998 6. Some OS don't have socklen_t but use size_t instead. This affects the
1999 fifth argument of getsockopt() amongst other things. This is now
2000 configurable by a macro called SOCKLEN_T which defaults to socklen_t, but
2001 can be set for individual OS. I have set it for SunOS5, OSF1, and
2002 Unixware7. Current versions of SunOS5 (aka Solaris) do have socklen_t, but
2003 some earlier ones do not.
2005 7. Change 4.30/15 was not doing the test caselessly.
2007 8. The standard form for an IPv6 address literal was being rejected by address
2008 parsing in, for example, MAIL and RCPT commands. An example of this kind of
2009 address is [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
2010 this, as well as the form without the "IPv6" on the front (but only when
2011 address literals are enabled, of course).
2013 9. Added some casts to avoid compiler warnings in OS/os.c-Linux.
2015 10. Exim crashed if a message with an empty sender address specified by -f
2016 encountered a router with an errors_to setting. This could be provoked only
2017 by a command such as
2021 where an empty string was supplied; "<>" did not hit this bug.
2023 11. Installed PCRE release 4.5.
2025 12. If EHLO/HELO was rejected by an ACL, the value of $sender_helo_name
2026 remained set. It is now erased.
2028 13. exiqgrep wasn't working on MacOS X because it didn't correctly compute
2029 times from message ids (which are base 36 rather than the normal 62).
2031 14. "Expected" SMTP protocol errors that can arise when PIPELINING is in use
2032 were being counted as actual protocol errors, and logged if the log
2033 selector +smtp_protocol_error was set. One cannot be perfect in this test,
2034 but now, if PIPELINING has been advertised, RCPT following a rejected MAIL,
2035 and DATA following a set of rejected RCPTs do not count as protocol errors.
2036 In other words, Exim assumes they were pipelined, though this may not
2037 actually be the case. Of course, in all cases the client gets an
2038 appropriate error code.
2040 15. If a lookup fails in an ACL condition, a message about the failure may
2041 be available; it is used if testing the ACL cannot continue, because most
2042 such messages specify what the cause of the deferral is. However, some
2043 messages (e.g. "MYSQL: no data found") do not cause a defer. There was bug
2044 that caused an old message to be retained and used if a later statement
2045 caused a defer, replacing the real cause of the deferral.
2047 16. If an IP address had so many PTR records that the DNS lookup buffer
2048 was not large enough to hold them, Exim could crash while trying to process
2049 the truncated data. It now detects and logs this case.
2051 17. Further to 4.21/58, another change has been made: if (and only if) the
2052 first line of a message (the first header line) ends with CRLF, a bare LF
2053 in a subsequent header line has a space inserted after it, so as not to
2054 terminate the header.
2056 18. Refactoring: tidied an ugly bit of code in appendfile that copied data
2057 unnecessarily, used atoi() instead of strtol(), and didn't check the
2058 termination when getting file sizes from file names by regex.
2060 19. Completely re-implemented the support for maildirsize files, in the light
2061 of a number of problems with the previous contributed implementation
2062 (4.30/29). In particular:
2064 . If the quota is zero, the maildirsize file is maintained, but no quota is
2067 . If the maildir directory does not exist, it is created before any attempt
2068 to write a maildirsize file.
2070 . The quota value in the file is just a cache; if the quota is changed in
2071 the transport, the new value overrides.
2073 . A regular expression is available for excluding directories from the
2076 20. The autoreply transport checks the characters in options that define the
2077 message's headers; it allows continued headers, but it was checking with
2078 isspace() after an embedded newline instead of explicitly looking for a
2081 21. If all the "regular" hosts to which an address was routed had passed their
2082 expiry times, and had not reached their retry times, the address was
2083 bounced, even if fallback hosts were defined. Now Exim should go on to try
2086 22. Increased buffer sizes in the callout code from 1024 to 4096 to match the
2087 equivalent code in the SMTP transport. Some hosts send humungous responses
2088 to HELO/EHLO, more than 1024 it seems.
2090 23. Refactoring: code in filter.c used (void *) for "any old type" but this
2091 gives compiler warnings in some environments. I've now done it "properly",
2094 24. The replacement for inet_ntoa() that is used with gcc on IRIX systems
2095 (because of problems with the built-in one) was declared to return uschar *
2096 instead of char *, causing compiler failure.
2098 25. Fixed a file descriptor leak when processing alias/forward files.
2100 26. Fixed a minor format string issue in dbfn.c.
2102 27. Typo in exim.c: ("dmbnz" for "dbmnz").
2104 28. If a filter file refered to $h_xxx or $message_headers, and the headers
2105 contained RFC 2047 "words", Exim's memory could, under certain conditions,
2108 29. When a sender address is verified, it is cached, to save repeating the test
2109 when there is more than one recipient in a message. However, when the
2110 verification involves a callout, it is possible for different callout
2111 options to be set for different recipients. It is too complicated to keep
2112 track of this in the cache, so now Exim always runs a verification when a
2113 callout is required, relying on the callout cache for the optimization.
2114 The overhead is duplication of the address routing, but this should not be
2117 30. Fixed a bug in callout caching. If a RCPT command caused the sender address
2118 to be verified with callout=postmaster, and the main callout worked but the
2119 postmaster check failed, the verification correctly failed. However, if a
2120 subsequent RCPT command asked for sender verification *without* the
2121 postmaster check, incorrect caching caused this verification also to fail,
2124 31. Exim caches DNS lookup failures so as to avoid multiple timeouts; however,
2125 it was not caching the DNS options (qualify_single, search_parents) that
2126 were used when the lookup failed. A subsequent lookup with different
2127 options therefore always gave the same answer, though there were cases
2128 where it should not have. (Example: a "domains = !$mx_any" option on a
2129 dnslookup router: the "domains" option is always processed without any
2130 widening, but the router might have qualify_single set.) Now Exim uses the
2131 cached value only when the same options are set.
2133 32. Added John Jetmore's "exipick" utility to the distribution.
2135 33. GnuTLS: When an attempt to start a TLS session fails for any reason other
2136 than a timeout (e.g. a certificate is required, and is not provided), an
2137 Exim server now closes the connection immediately. Previously it waited for
2138 the client to close - but if the client is SSL, it seems that they each
2139 wait for each other, leading to a delay before one of them times out.
2141 34: GnuTLS: Updated the code to use the new GnuTLS 1.0.0 API. I have not
2142 maintained 0.8.x compatibility because I don't think many are using it, and
2143 it is clearly obsolete.
2145 35. Added TLS support for CRLs: a tls_crl global option and one for the smtp
2148 36. OpenSSL: $tls_certificate_verified was being set to 1 even if the
2149 client certificate was expired. A simple patch fixes this, though I don't
2150 understand the full logic of why the verify callback is called multiple
2153 37. OpenSSL: a patch from Robert Roselius: "Enable client-bug workaround.
2154 Versions of OpenSSL as of 0.9.6d include a 'CBC countermeasure' feature,
2155 which causes problems with some clients (such as the Certicom SSL Plus
2156 library used by Eudora). This option, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS,
2157 disables the coutermeasure allowing Eudora to connect."
2159 38. Exim was not checking that a write() to a log file succeeded. This could
2160 lead to Bad Things if a log got too big, in particular if it hit a file
2161 size limit. Exim now panics and dies if it cannot write to a log file, just
2162 as it does if it cannot open a log file.
2164 39. Modified OS/Makefile-Linux so that it now contains
2166 CFLAGS=-O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
2168 The two -D definitions ensure that Exim is compiled with large file
2169 support, which makes it possible to handle log files that are bigger than
2172 40. Fixed a subtle caching bug: if (in an ACL or a set of routers, for
2173 instance) a domain was checked against a named list that involved a lookup,
2174 causing $domain_data to be set, then another domain was checked against the
2175 same list, then the first domain was re-checked, the value of $domain_data
2176 after the final check could be wrong. In particular, if the second check
2177 failed, it could be set empty. This bug probably also applied to
2180 41. The strip_trailing_dot option was not being applied to the address given
2181 with the -f command-line option.
2183 42. The code for reading a message's header from the spool was incrementing
2184 $received_count, but never initializing it. This meant that the value was
2185 incorrect (doubled) while delivering a message in the same process in which
2186 it was received. In the most common configuration of Exim, this never
2187 happens - a fresh exec is done - but it can happen when
2188 deliver_drop_privilege is set.
2190 43. When Exim logs an SMTP synchronization error - client data sent too soon -
2191 it now includes up to 150 characters of the unexpected data in the log
2194 44. The exim_dbmbuild utility uses fixed size buffers for reading input lines
2195 and building data strings. The size of both of these buffers was 10 000
2196 bytes - far larger than anybody would *ever* want, thought I. Needless to
2197 say, somebody hit the limit. I have increased the maximum line length to
2198 20 000 and the maximum data length of concatenated lines to 100 000. I have
2199 also fixed two bugs, because there was no checking on these buffers. Tsk,
2200 tsk. Now exim_dbmbuild gives a message and exits with an error code if a
2201 buffer is too small.
2203 45. The exim_dbmbuild utility did not support quoted keys, as Exim does in
2204 lsearch lookups. Now it does.
2206 46. When parsing a route_list item in a manualroute router, a fixed-length
2207 buffer was used for the list of hosts. I made this 1024 bytes long,
2208 thinking that nobody would ever have a list of hosts that long. Wrong.
2209 Somebody had a whole pile of complicated expansion conditions, and the
2210 string was silently truncated, leading to an expansion error. It turns out
2211 that it is easier to change to an unlimited length (owing to other changes
2212 that have happened since this code was originally written) than to build
2213 structure for giving a limitation error. The length of the item that
2214 expands into the list of hosts is now unlimited.
2216 47. The lsearch lookup could not handle data where the length of text line was
2217 more than 4095 characters. Such lines were truncated, leading to shortened
2218 data being returned. It should now handle lines of any length.
2220 48. Minor wording revision: "cannot test xxx in yyy ACL" becomes "cannot test
2221 xxx condition in yyy ACL" (e.g. "cannot test domains condition in DATA
2224 49. Cosmetic tidy to scripts like exicyclog that are generated by globally
2225 replacing strings such as BIN_DIRECTORY in a source file: the replacement
2226 no longer happens in comment lines. A list of replacements is now placed
2227 at the head of all of the source files, except those whose only change is
2228 to replace PERL_COMMAND in the very first #! line.
2230 50. Replaced the slow insertion sort in queue.c, for sorting the list of
2231 messages on the queue, with a bottom-up merge sort, using code contributed
2232 by Michael Haardt. This should make operations like -bp somewhat faster on
2233 large queues. It won't affect queue runners, except when queue_run_in_order
2236 51. Installed eximstats 1.31 in the distribution.
2238 52. Added support for SRV lookups to the dnslookup router.
2240 53. If an ACL referred to $message_body or $message_body_end, the value was not
2241 reset for any messages that followed in the same SMTP session.
2243 54. The store-handling optimization for building very long strings was not
2244 differentiating between the different store pools. I don't think this
2245 actually made any difference in practice, but I've tidied it.
2247 55. While running the routers to verify a sender address, $sender_address
2248 was still set to the sender address. This is wrong, because when routing to
2249 send a bounce to the sender, it would be empty. Therefore, I have changed
2250 it so that, while verifying a sender address, $sender_address is set to <>.
2251 (There is no change to what happens when verifying a recipient address.)
2253 56. After finding MX (or SRV) records, Exim was doing a DNS lookup for the
2254 target A or AAAA records (if not already returned) without resetting the
2255 qualify_single or search_parents options of the DNS resolver. These are
2256 inappropriate in this case because the targets of MX and SRV records must
2257 be FQDNs. A broken DNS record could cause trouble if it happened to have a
2258 target that, when qualified, matched something in the local domain. These
2259 two options are now turned off when doing these lookups.
2261 57. It seems that at least some releases of Reiserfs (which does not have the
2262 concept of a fixed number of inodes) returns zero and not -1 for the
2263 number of available inodes. This interacted badly with check_spool_inodes,
2264 which assumed that -1 was the "no such thing" setting. What I have done is
2265 to check that the total number of inodes is greater than zero before doing
2266 the test of how many are available.
2268 58. When a "warn" ACL statement has a log_message modifier, the message is
2269 remembered, and not repeated. This is to avoid a lot of repetition when a
2270 message has many recipients that cause the same warning to be written.
2271 Howewer, Exim was preserving the list of already written lines for an
2272 entire SMTP session, which doesn't seem right. The memory is now reset if a
2273 new message is started.
2275 59. The "rewrite" debugging flag was not showing the result of rewriting in the
2276 debugging output unless log_rewrite was also set.
2278 60. Avoid a compiler warning on 64-bit systems in dsearch.c by avoiding the use
2279 of (int)(handle) when we know that handle contains (void *)(-1).
2281 61. The Exim daemon panic-logs an error return when it closes the incoming
2282 connection. However "connection reset by peer" seems to be common, and
2283 isn't really an error worthy of noting specially, so that particular error
2286 62. When Exim is trying to find all the local interfaces, it used to panic and
2287 die if the ioctl to get the interface flags failed. However, it seems that
2288 on at least one OS (Solaris 9) it is possible to have an interface that is
2289 included in the list of interfaces, but for which you get a failure error
2290 for this call. This happens when the interface is not "plumbed" into a
2291 protocol (i.e. neither IPv4 nor IPv6). I've changed the code so that a
2292 failure of the "get flags" call assumes that the interface is down.
2294 63. Added a ${eval10: operator, which assumes all numbers are decimal. This
2295 makes life easier for people who are doing arithmetic on fields extracted
2296 from dates, where you often get leading zeros that should not be
2297 interpreted as octal.
2299 64. Added qualify_domain to the redirect router, to override the global
2302 65. If a pathologically long header line contained very many addresses (the
2303 report of this problem mentioned 10 000) and each of them was rewritten,
2304 Exim could use up a very large amount of memory. (It kept on making new
2305 copies of the header line as it rewrote, and never released the old ones.)
2306 At the expense of a bit more processing, the header rewriting function has
2307 been changed so that it no longer eats memory in this way.
2309 66. The generation of the Received: header has been moved from the time that a
2310 message starts to be received, to the time that it finishes. The timestamp
2311 in the Received: header should now be very close to that of the <= log
2312 line. There are two side-effects of this change:
2314 (a) If a message is rejected by a DATA or non-SMTP ACL or local_scan(), the
2315 logged header lines no longer include the local Received: line, because
2316 it has not yet been created. The same applies to a copy of the message
2317 that is returned to a non-SMTP sender when a message is rejected.
2319 (b) When a filter file is tested using -bf, no additional Received: header
2320 is added to the test message. After some thought, I decided that this
2323 This change does not affect the value of $received_for. It is still set
2324 after address rewriting, but before local_scan() is called.
2326 67. Installed the latest Cygwin-specific files from the Cygwin maintainer.
2328 68. GnuTLS: If an empty file is specified for tls_verify_certificates, GnuTLS
2329 gave an unhelpful panic error message, and a defer error. I have managed to
2330 change this behaviour so that it now rejects any supplied certificate,
2331 which seems right, as the list of acceptable certificates is empty.
2333 69. OpenSSL: If an empty file is specified for tls_verify_certificates, OpenSSL
2334 gave an unhelpful defer error. I have not managed to make this reject any
2335 supplied certificates, but the error message it gives is "no certificate
2336 supplied", which is not helpful.
2338 70. exigrep's output now also includes lines that are not associated with any
2339 message, but which match the given pattern. Implemented by a patch from
2340 Martin Sluka, which also tidied up the Perl a bit.
2342 71. Recipient callout verification, like sender verification, was using <> in
2343 the MAIL FROM command. This isn't really the right thing, since the actual
2344 sender may affect whether the remote host accepts the recipient or not. I
2345 have changed it to use the actual sender in the callout; this means that
2346 the cache record is now keyed on a recipient/sender pair, not just the
2347 recipient address. There doesn't seem to be a real danger of callout loops,
2348 since a callout by the remote host to check the sender would use <>.
2349 [SEE ABOVE: changed after hitting problems.]
2351 72. Exim treats illegal SMTP error codes that do not begin with 4 or 5 as
2352 temporary errors. However, in the case of such a code being given after
2353 the end of a data transmission (i.e. after ".") Exim was failing to write
2354 a retry record for the message. (Yes, there was some broken host that was
2355 actually sending 8xx at this point.)
2357 73. An unknown lookup type in a host list could cause Exim to panic-die when
2358 the list was checked. (An example that provoked this was putting <; in the
2359 middle of a list instead of at the start.) If this happened during a DATA
2360 ACL check, a -D file could be left lying around. This kind of configuration
2361 error no longer causes Exim to die; instead it causes a defer errror. The
2362 incident is still logged to the main and panic logs.
2364 74. Buglet left over from Exim 3 conversion. The message "too many messages
2365 in one connection" was written to the rejectlog but not the mainlog, except
2366 when address rewriting (yes!) was being logged.
2368 75. Added write_rejectlog option.
2370 76. When a system filter was run not as root (that is, when system_filter_user
2371 was set), the values of the $n variables were not being returned to the
2372 main process; thus, they were not subsequently available in the $sn
2375 77. Added +return_path_on_delivery log selector.
2377 78. A connection timeout was being treated differently from recipients deferred
2378 when testing hosts_max_try with a message that was older than the host's
2379 retry timeout. (The host should not be counted, thus allowing all hosts to
2380 be tried at least once before bouncing.) This may have been the cause of an
2381 occasionally reported bug whereby a message would remain on the queue
2382 longer than the retry timeout, but would be bounced if a delivery was
2383 forced. I say "may" because I never totally pinned down the problem;
2384 setting up timeout/retry tests is difficult. See also the next item.
2386 79. The ultimate address timeout was not being applied to errors that involved
2387 a combination of host plus message (for example, a timeout on a MAIL
2388 command). When an address resolved to a number of possible hosts, and they
2389 were not all tried for each delivery (e.g. because of hosts_max_try), a
2390 message could remain on the queue longer than the retry timeout.
2392 80. Sieve bug: "stop" inside "elsif" was broken. Applied a patch from Michael
2395 81. Fixed an obscure SMTP outgoing bug which required at least the following
2396 conditions: (a) there was another message waiting for the same server;
2397 (b) the server returned 5xx to all RCPT commands in the first message so
2398 that the message was not completed; (c) the server dropped the connection
2399 or gave a negative response to the RSET that Exim sends to abort the
2400 transaction. The observed case was a dropped connection after DATA that had
2401 been sent in pipelining mode. That is, the server had advertised PIPELINING
2402 but was not implementing it correctly. The effect of the bug was incorrect
2403 behaviour, such as trying another host, and this could lead to a crash.
2409 1. The 3rd arguments to getsockname(), getpeername(), and accept() in exim.c
2410 and daemon.c were passed as pointers to ints; they should have been
2411 pointers to socklen_t variables (which are typically unsigned ints).
2413 2. Some signed/unsigned type warnings in the os.c file for Linux have been
2416 3. Fixed a really odd bug that affected only the testing scheme; patching a
2417 certain fixed string in the binary changed the value of another string that
2418 happened to be identical to the end of the original first string.
2420 4. When gethostbyname() (or equivalent) is passed an IP address as a "host
2421 name", it returns that address as the IP address. On some operating
2422 systems (e.g. Solaris), it also passes back the IP address string as the
2423 "host name". However, on others (e.g. Linux), it passes back an empty
2424 string. Exim wasn't checking for this, and was changing the host name to an
2425 empty string, assuming it had been canonicized.
2427 5. Although rare, it is permitted to have more than one PTR record for a given
2428 IP address. I thought that gethostbyaddr() or getipnodebyaddr() always gave
2429 all the names associated with an address, because they do in Solaris.
2430 However, it seems that they do not in Linux for data that comes from the
2431 DNS. If an address in /etc/hosts has multiple names, they _are_ all given.
2432 I found this out when I moved to a new Linux workstation and tried to run
2433 the Exim test suite.
2435 To get round this problem I have changed the code so that it now does its
2436 own call to the DNS to look up PTR records when searching for a host name.
2437 If nothing can be found in the DNS, it tries gethostbyaddr(), so that
2438 addresses that are only in /etc/hosts are still found.
2440 This behaviour is, however, controlled by an option called host_lookup_
2441 order, which defaults to "bydns:byaddr". If people want to use the other
2442 order, or indeed, just use one or the other means of lookup, they can
2443 specify it in this variable.
2445 6. If a PTR record yields an empty name, Exim treats it as non-existent. In
2446 some operating systems, this comes back from gethostbyaddr() as an empty
2447 string, and this is what Exim used to test for. However, it seems that in
2448 other systems, "." is yielded. Exim now tests for this case too.
2450 7. The values of check_spool_space and check_log_space are now held internally
2451 as a number of kilobytes instead of an absolute number of bytes. If a
2452 numbers is specified without 'K' or 'M', it is rounded up to the nearest
2453 kilobyte. This means that much larger values can be stored.
2455 8. Exim monitor: an attempt to get the action menu when not actually pointing
2456 at a message produces an empty menu entitled "No message selected". This
2457 works on Solaris (OpenWindows). However, XFree86 does not like a menu with
2458 no entries in it ("Shell widget menu has zero width and/or height"). So I
2459 have added a single, blank menu entry in this case.
2461 9. Added ${quote_local_part.
2463 10. MIME decoding is now applied to the contents of Subject: header lines when
2466 11. Now that a reference to $sender_host_address automatically causes a reverse
2467 lookup to occur if necessary (4.13/18), there is no need to arrange for a
2468 host lookup before query-style lookups in lists that might use this
2469 variable. This has therefore been abolished, and the "net-" prefix is no
2470 longer necessary for query-style lookups.
2472 12. The Makefile for SCO_SV contained a setting of LDFLAGS. This appears to
2473 have been a typo for LFLAGS, so it has been changed.
2475 13. The install script calls Exim with "-C /dev/null" in order to find the
2476 version number. If ALT_CONFIG_PREFIX was set, this caused an error message
2477 to be output. Howeve, since Exim outputs its version number before the
2478 error, it didn't break the script. It just looked ugly. I fixed this by
2479 always allowing "-C /dev/null" if the caller is root.
2481 14. Ignore overlarge ACL variable number when reading spool file - insurance
2482 against a later release with more variables having written the file.
2484 15. The standard form for an IPv6 address literal was being rejected by EHLO.
2485 Example: [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
2486 this, as well as the form without the "IPv6" on the front.
2488 16. Added CHOWN_COMMAND=/usr/sbin/chown and LIBS=-lresolv to the
2489 OS/Makefile-Darwin file.
2491 17. Fixed typo in lookups/ldap.c: D_LOOKUP should be D_lookup. This applied
2492 only to LDAP libraries that do not have LDAP_OPT_DEREF.
2494 18. After change 4.21/52, "%ld" was used to format the contents of the $inode
2495 variable. However, some OS use ints for inodes. I've added cast to long int
2496 to get rid of the compiler warning.
2498 19. I had forgotten to lock out "/../" in configuration file names when
2499 ALT_CONFIG_PREFIX was set.
2501 20. Routers used for verification do not need to specify transports. However,
2502 if such a router generated a host list, and callout was configured, Exim
2503 crashed, because it could not find a port number from the (non-existent)
2504 transport. It now assumes port 25 in this circumstance.
2506 21. Added the -t option to exigrep.
2508 22. If LOOKUP_LSEARCH is defined, all three linear search methods (lsearch,
2509 wildlsearch, nwildlsearch) are compiled. LOOKUP_WILDLSEARCH and LOOKUP_
2510 NWILDLSEARCH are now obsolete, but retained for compatibility. If either of
2511 them is set, LOOKUP_LSEARCH is forced.
2513 23. "exim -bV" now outputs a list of lookups that are included in the binary.
2515 24. Added sender and host information to the "rejected by local_scan()" log
2516 line; previously there was no indication of these.
2518 25. Added .include_if_exists.
2520 26. Change 3.952/11 added an explicit directory sync on top of a file sync for
2521 Linux. It turns out that not all file systems support this. Apparently some
2522 versions of NFS do not. (It's rare to put Exim's spool on NFS, but people
2523 do it.) To cope with this, the error EINVAL, which means that sync-ing is
2524 not supported on the file descriptor, is now ignored when Exim is trying to
2525 sync a directory. This applies only to Linux.
2527 27. Added -DBIND_8_COMPAT to the CLFAGS setting for Darwin.
2529 28. In Darwin (MacOS X), the PAM headers are in /usr/include/pam and not in
2530 /usr/include/security. There's now a flag in OS/os.h-Darwin to cope with
2533 29. Added support for maildirsize files from supplied patch (modified a bit).
2535 30. The use of :fail: followed by an empty string could lead Exim to respond to
2536 sender verification failures with (e.g.):
2538 550 Verification failed for <xxx>
2539 550 Sender verify failed
2541 where the first response line was missing the '-' that indicates it is not
2542 the final line of the response.
2544 31. The loop for finding the name of the user that called Exim had a hardwired
2545 limit of 10; it now uses the value of finduser_retries, which is used for
2546 all other user lookups.
2548 32. Added $received_count variable, available in data and not_smtp ACLs, and at
2551 33. Exim was neglecting to zero errno before one call of strtol() when
2552 expanding a string and expecting an integer value. On some systems this
2553 resulted in spurious "integer overflow" errors. Also, it was casting the
2554 result into an int without checking.
2556 34. Testing for a connection timeout using "timeout_connect" in the retry rules
2557 did not work. The code looks as if it has *never* worked, though it appears
2558 to have been documented since at least releast 1.62. I have made it work.
2560 35. The "timeout_DNS" error in retry rules, also documented since at least
2561 1.62, also never worked. As it isn't clear exactly what this means, and
2562 clearly it isn't a major issue, I have abolished the feature by treating it
2563 as "timeout", and writing a warning to the main and panic logs.
2565 36. The display of retry rules for -brt wasn't always showing the error code
2568 37. Added new error conditions to retry rules: timeout_A, timeout_MX,
2569 timeout_connect_A, timeout_connect_MX.
2571 38. Rewriting the envelope sender at SMTP time did not allow it to be rewritten
2572 to the empty sender.
2574 39. The daemon was not analysing the content of -oX till after it had closed
2575 stderr and disconnected from the controlling terminal. This meant that any
2576 syntax errors were only noted on the panic log, and the return code from
2577 the command was 0. By re-arranging the code a little, I've made the
2578 decoding happen first, so such errors now appear on stderr, and the return
2579 code is 1. However, the actual setting up of the sockets still happens in
2580 the disconnected process, so errors there are still only recorded on the
2583 40. A daemon listener on a wildcard IPv6 socket that also accepts IPv4
2584 connections (as happens on some IP stacks) was logged at start up time as
2585 just listening for IPv6. It now logs "IPv6 with IPv4". This differentiates
2586 it from "IPv6 and IPv4", which means that two separate sockets are being
2589 41. The debug output for gethostbyname2() or getipnodebyname() failures now
2590 says whether AF_INET or AF_INET6 was passed as an argument.
2592 42. Exiwhat output was messed up when time zones were included in log
2595 43. Exiwhat now gives more information about the daemon's listening ports,
2596 and whether -tls-on-connect was used.
2598 44. The "port" option of the smtp transport is now expanded.
2600 45. A "message" modifier in a "warn" statement in a non-message ACL was being
2601 silently ignored. Now an error message is written to the main and panic
2604 46. There's a new ACL modifier called "logwrite" which writes to a log file
2605 as soon as it is encountered.
2607 47. Added $local_user_uid and $local_user_gid at routing time.
2609 48. Exim crashed when trying to verify a sender address that was being
2612 49. Exim was recognizing only a space character after ".include". It now also
2613 recognizes a tab character.
2615 50. Fixed several bugs in the Perl script that creates the exim.8 man page by
2616 extracting the relevant information from the specification. The man page no
2617 longer contains scrambled data for the -d option, and I've added a section
2618 at the front about calling Exim under different names.
2620 51. Added "extra_headers" argument to the "mail" command in filter files.
2622 52. Redirecting mail to an unqualified address in a Sieve filter caused Exim to
2625 53. Installed eximstats 1.29.
2627 54. Added transport_filter_timeout as a generic transport option.
2629 55. Exim no longer adds an empty Bcc: header to messages that have no To: or
2630 Cc: header lines. This was required by RFC 822, but it not required by RFC
2633 56. Exim used to add From:, Date:, and Message-Id: header lines to any
2634 incoming messages that did not have them. Now it does so only if the
2635 message originates locally, that is, if there is no associated remote host
2636 address. When Resent- header lines are present, this applies to the Resent-
2637 lines rather than the non-Resent- lines.
2639 57. Drop incoming SMTP connection after too many syntax or protocol errors. The
2640 limit is controlled by smtp_max_synprot_errors, defaulting to 3.
2642 58. Messages for configuration errors now include the name of the main
2643 configuration file - useful now that there may be more than one file in a
2644 list (.included file names were always shown).
2646 59. Change 4.21/82 (run initgroups() when starting the daemon) causes problems
2647 for those rare installations that do not start the daemon as root or run it
2648 setuid root. I've cut out the call to initgroups() if the daemon is not
2651 60. The Exim user and group can now be bound into the binary as text strings
2652 that are looked up at the start of Exim's processing.
2654 61. Applied a small patch for the Interbase code, supplied by Ard Biesheuvel.
2656 62. Added $mailstore_basename variable.
2658 63. Installed patch to sieve.c from Michael Haardt.
2660 64. When Exim failed to open the panic log after failing to open the main log,
2661 the original message it was trying to log was written to stderr and debug
2662 output, but if they were not available (the usual case in production), it
2663 was lost. Now it is written to syslog before the two lines that record the
2664 failures to open the logs.
2666 65. Users' Exim filters run in subprocesses under the user's uid. It is
2667 possible for a "deliver" command or an alias in a "personal" command to
2668 provoke an address rewrite. If logging of address rewriting is configured,
2669 this fails because the process is not running as root or exim. There may be
2670 a better way of dealing with this, but for the moment (because 4.30 needs
2671 to be released), I have disabled address rewrite logging when running a
2672 filter in a non-root, non-exim process.
2678 1. The buildconfig auxiliary program wasn't quoting the value set for
2679 HEADERS_CHARSET. This caused a compilation error complaining that 'ISO' was
2680 not defined. This bug was masked in 4.22 by the effect that was fixed in
2683 2. Some messages that were rejected after a message id was allocated were
2684 shown as "incomplete" by exigrep. It no longer does this for messages that
2685 are rejected by local_scan() or the DATA or non-SMTP ACLs.
2687 3. If a Message-ID: header used a domain literal in the ID, and Exim did not
2688 have allow_domain_literals set, the ID did not get logged in the <= line.
2689 Domain literals are now always recognized in Message-ID: header lines.
2691 4. The first argument for a ${extract expansion item is the key name or field
2692 number. Leading and trailing spaces in this item were not being ignored,
2693 causing some misleading effects.
2695 5. When deliver_drop_privilege was set, single queue runner processes started
2696 manually (i.e. by the command "exim -q") or by the daemon (which uses the
2697 same command in the process it spins off) were not dropping privilege.
2699 6. When the daemon running as "exim" started a queue runner, it always
2700 re-executed Exim in the spun-off process. This is a waste of effort when
2701 deliver_drop_privilege is set. The new process now just calls the
2702 queue-runner function directly.
2708 1. Typo in the src/EDITME file: it referred to HEADERS_DECODE_TO instead of
2711 2. Change 4.21/73 introduced a bug. The pid file path set by -oP was being
2712 ignored. Though the use of -oP was forcing the writing of a pid file, it
2713 was always written to the default place.
2715 3. If the message "no IP address found for host xxxx" is generated during
2716 incoming verification, it is now followed by identification of the incoming
2717 connection (so you can more easily find what provoked it).
2719 4. Bug fix for Sieve filters: "stop" inside a block was not working properly.
2721 5. Added some features to "harden" Exim a bit more against certain attacks:
2723 (a) There is now a build-time option called FIXED_NEVER_USERS that can
2724 be put in Local/Makefile. This is like the never_users runtime option,
2725 but it cannot be overridden. The default setting is "root".
2727 (b) If ALT_CONFIG_PREFIX is defined in Local/Makefile, it specifies a
2728 prefix string with which any file named in a -C command line option
2731 (c) If ALT_CONFIG_ROOT_ONLY is defined in Local/Makefile, root privilege
2732 is retained for -C and -D only if the caller of Exim is root. Without
2733 it, the exim user may also use -C and -D and retain privilege.
2735 (d) If DISABLE_D_OPTION is defined in Local/Makefile, the use of the -D
2736 command line option is disabled.
2738 6. Macro names set by the -D option must start with an upper case letter, just
2739 like macro names defined in the configuration file.
2741 7. Added "dereference=" facility to LDAP.
2743 8. Two instances of the typo "uknown" in the source files are fixed.
2745 9. If a PERL_COMMAND setting in Local/Makefile was not at the start of a line,
2746 the Configure-Makefile script screwed up while processing it.
2748 10. Incorporated PCRE 4.4.
2750 11. The SMTP synchronization check was not operating right at the start of an
2751 SMTP session. For example, it could not catch a HELO sent before the client
2752 waited for the greeting. There is now a check for outstanding input at the
2753 point when the greeting is written. Because of the duplex, asynchronous
2754 nature of TCP/IP, it cannot be perfect - the incorrect input may be on its
2755 way, but not yet received, when the check is performed.
2757 12. Added tcp_nodelay to make it possible to turn of the setting of TCP_NODELAY
2758 on TCP/IP sockets, because this apparently causes some broken clients to
2761 13. Installed revised OS/Makefile-CYGWIN and OS/os.c-cygwin (the .h file was
2762 unchanged) from the Cygwin maintainer.
2764 14. The code for -bV that shows what is in the binary showed "mbx" when maildir
2765 was supported instead of testing for mbx. Effectively a typo.
2767 15. The spa authenticator server code was not checking that the input it
2768 received was valid base64.
2770 16. The debug output line for the "set" modifier in ACLs was not showing the
2771 name of the variable that was being set.
2773 17. Code tidy: the variable type "vtype_string" was never used. Removed it.
2775 18. Previously, a reference to $sender_host_name did not cause a DNS reverse
2776 lookup on its own. Something else was needed to trigger the lookup. For
2777 example, a match in host_lookup or the need for a host name in a host list.
2778 Now, if $sender_host_name is referenced and the host name has not yet been
2779 looked up, a lookup is performed. If the lookup fails, the variable remains
2780 empty, and $host_lookup_failed is set to "1".
2782 19. Added "eqi" as a case-independent comparison operator.
2784 20. The saslauthd authentication condition could segfault if neither service
2785 nor realm was specified.
2787 21. If an overflowing value such as "2048M" was set for message_size_limit, the
2788 error message that was logged was misleading, and incoming SMTP
2789 connections were dropped. The message is now more accurate, and temporary
2790 errors are given to SMTP connections.
2792 22. In some error situations (such as 21 above) Exim rejects all SMTP commands
2793 (except RSET) with a 421 error, until QUIT is received. However, it was
2794 failing to send a response to QUIT.
2796 23. The HELO ACL was being run before the code for helo_try_verify_hosts,
2797 which made it impossible to use "verify = helo" in the HELO ACL. The HELO
2798 ACL is now run after the helo_try_verify_hosts code.
2800 24. "{MD5}" and "{SHA1}" are now recognized as equivalent to "{md5"} and
2801 "{sha1}" in the "crypteq" expansion condition (in fact the comparison is
2802 case-independent, so other case variants are also recognized). Apparently
2803 some systems use these upper case variants.
2805 25. If more than two messages were waiting for the same host, and a transport
2806 filter was specified for the transport, Exim sent two messages over the
2807 same TCP/IP connection, and then failed with "socket operation on non-
2808 socket" when it tried to send the third.
2810 26. Added Exim::debug_write and Exim::log_write for embedded Perl use.
2812 27. The extern definition of crypt16() in expand.c was not being excluded when
2813 the OS had its own crypt16() function.
2815 28. Added bounce_return_body as a new option, and bounce_return_size_limit
2816 as a preferred synonym for return_size_limit, both as an option and as an
2819 29. Added LIBS=-liconv to OS/Makefile-OSF1.
2821 30. Changed the default configuration ACL to relax the local part checking rule
2822 for addresses that are not in any local domains. For these addresses,
2823 slashes and pipe symbols are allowed within local parts, but the sequence
2824 /../ is explicitly forbidden.
2826 31. SPA server authentication was not clearing the challenge buffer before
2829 32. log_message in a "warn" ACL statement was writing to the reject log as
2830 well as to the main log, which contradicts the documentation and doesn't
2831 seem right (because no rejection is happening). So I have stopped it.
2833 33. Added Ard Biesheuvel's lookup code for accessing an Interbase database.
2834 However, I am unable to do any testing of this.
2836 34. Fixed an infelicity in the appendfile transport. When checking directories
2837 for a mailbox, to see if any needed to be created, it was accidentally
2838 using path names with one or more superfluous leading slashes; tracing
2839 would show up entries such as stat("///home/ph10", 0xFFBEEA48).
2841 35. If log_message is set on a "discard" verb in a MAIL or RCPT ACL, its
2842 contents are added to the log line that is written for every discarded
2843 recipient. (Previously a log_message setting was ignored.)
2845 36. The ${quote: operator now quotes the string if it is empty.
2847 37. The install script runs exim in order to find its version number. If for
2848 some reason other than non-existence or emptiness, which it checks, it
2849 could not run './exim', it was installing it with an empty version number,
2850 i.e. as "exim-". This error state is now caught, and the installation is
2853 38. An argument was missing from the function that creates an error message
2854 when Exim fails to connect to the socket for saslauthd authentication.
2855 This could cause Exim to crash, or give a corrupted message.
2857 39. Added isip, isip4, and isip6 to ${if conditions.
2859 40. The ACL variables $acl_xx are now saved with the message, and can be
2860 accessed later in routers, transports, and filters.
2862 41. The new lookup type nwildlsearch is like wildlsearch, except that the key
2863 strings in the file are not string-expanded.
2865 42. If a MAIL command specified a SIZE value that was too large to fit into an
2866 int variable, the check against message_size_limit failed. Such values are
2867 now forced to INT_MAX, which is around 2Gb for a 32-bit variable. Maybe one
2868 day this will have to be increased, but I don't think I want to be around
2869 when emails are that large.
2876 1. Removed HAVE_ICONV=yes from OS/Makefile-FreeBSD, since it seems that
2877 iconv() is not standard in FreeBSD.
2879 2. Change 4.21/17 was buggy and could cause stack overwriting on a system with
2880 IPv6 enabled. The observed symptom was a segmentation fault on return from
2881 the function os_common_find_running_interfaces() in src/os.c.
2883 3. In the check_special_case() function in daemon.c I had used "errno" as an
2884 argument name, which causes warnings on some systems. This was basically a
2885 typo, since it was named "eno" in the comments!
2887 4. The code that waits for the clock to tick (at a resolution of some fraction
2888 of a second) so as to ensure message-id uniqueness was always waiting for
2889 at least one whole tick, when it could have waited for less. [This is
2890 almost certainly not relevant at current processor speeds, where it is
2891 unlikely to ever wait at all. But we try to future-proof.]
2893 5. The function that sleeps for a time interval that includes fractions of a
2894 second contained a race. It did not block SIGALRM between setting the
2895 timer, and suspending (a couple of lines later). If the interval was short
2896 and the sigsuspend() was delayed until after it had expired, the suspension
2897 never ended. On busy systems this could lead to processes getting stuck for
2900 6. Some uncommon configurations may cause a lookup to happen in a queue runner
2901 process, before it forks any delivery processes. The open lookup caching
2902 mechanism meant that the open file or database connection was passed into
2903 the delivery process. The problem was that delivery processes always tidy
2904 up cached lookup data. This could cause a problem for the next delivery
2905 process started by the queue runner, because the external queue runner
2906 process does not know about the closure. So the next delivery process
2907 still has data in the lookup cache. In the case of a file lookup, there was
2908 no problem because closing a file descriptor in a subprocess doesn't affect
2909 the parent. However, if the lookup was caching a connection to a database,
2910 the connection was closed, and the second delivery process was likely to
2911 see errors such as "PGSQL: query failed: server closed the connection
2912 unexpectedly". The problem has been fixed by closing all cached lookups
2913 in a queue runner before running a delivery process.
2915 7. Compiler warning on Linux for the second argument of iconv(), which doesn't
2916 seem to have the "const" qualifier which it has on other OS. I've
2919 8. Change 4.21/2 was too strict. It is only if there are two authenticators
2920 *of the same type* (client or server) with the same public name that an
2921 error should be diagnosed.
2923 9. When Exim looked up a host name for an IP address, but failed to find the
2924 original IP address when looking up the host name (a safety check), it
2925 output the message "<ip address> does not match any IP for NULL", which was
2926 confusing, to say the least. The bug was that the host name should have
2927 appeared instead of "NULL".
2929 10. Since release 3.03, if Exim is called by a uid other than root or the Exim
2930 user that is built into the binary, and the -C or -D options is used, root
2931 privilege is dropped before the configuration file is read. In addition,
2932 logging is switched to stderr instead of the normal log files. If the
2933 configuration then re-defines the Exim user, the unprivileged environment
2934 is probably not what is expected, so Exim logs a panic warning message (but
2937 However, if deliver_drop_privilege is set, the unprivileged state may well
2938 be exactly what is intended, so the warning has been cut out in that case,
2939 and Exim is allowed to try to write to its normal log files.
2945 1. smtp_return_error_details was not giving details for temporary sender
2946 or receiver verification errors.
2948 2. Diagnose a configuration error if two authenticators have the same public
2951 3. Exim used not to create the message log file for a message until the first
2952 delivery attempt. This could be confusing when incoming messages were held
2953 for policy or load reasons. The message log file is now created at the time
2954 the message is received, and an initial "Received" line is written to it.
2956 4. The automatically generated man page for command line options had a minor
2957 bug that caused no ill effects; however, a more serious problem was that
2958 the procedure for building the man page automatically didn't always
2959 operate. Consequently, release 4.20 contains an out-of-date version. This
2960 shouldn't happen again.
2962 5. When building Exim with embedded Perl support, the script that builds the
2963 Makefile was calling 'perl' to find its compile-time parameters, ignoring
2964 any setting of PERL_COMMAND in Local/Makefile. This is now fixed.
2966 6. The freeze_tell option was not being used for messages that were frozen on
2967 arrival, either by an ACL or by local_scan().
2969 7. Added the smtp_incomplete_transaction log selector.
2971 8. After STARTTLS, Exim was not forgetting that it had advertised AUTH, so it
2972 was accepting AUTH without a new EHLO.
2974 9. Added tls_remember_esmtp to cope with YAEB. This allows AUTH and other
2975 ESMTP extensions after STARTTLS without a new EHLO, in contravention of the
2978 10. Logging of TCP/IP connections (when configured) now happens in the main
2979 daemon process instead of the child process, so that the TCP/IP connection
2980 count is more accurate (but it can never be perfect).
2982 11. The use of "drop" in a nested ACL was not being handled correctly in the
2983 outer ACL. Now, if condition failure induced by the nested "drop" causes
2984 the outer ACL verb to deny access ("accept" or "discard" after "endpass",
2985 or "require"), the connection is dropped.
2987 12. Similarly, "discard" in a nested ACL wasn't being handled. A nested ACL
2988 that yield "discard" can now be used with an "accept" or a "discard" verb,
2989 but an error is generated for any others (because I can't see a useful way
2990 to define what should happen).
2992 13. When an ACL is read dynamically from a file (or anywhere else), the lines
2993 are now processed in the same way as lines in the Exim configuration file.
2994 In particular, continuation lines are supported.
2996 14. Added the "dnslists = a.b.c!=n.n.n.n" feature.
2998 15. Added -ti meaning -t -i.
3000 16. Check for letters, digits, hyphens, and dots in the names of dnslist
3001 domains, and warn by logging if others are found.
3003 17. At least on BSD, alignment is not guarenteed for the array of ifreq's
3004 returned from GIFCONF when Exim is trying to find the list of interfaces on
3005 a host. The code in os.c has been modified to copy each ifreq to an aligned
3006 structure in all cases.
3008 Also, in some cases, the returned ifreq's were being copied to a 'struct
3009 ifreq' on the stack, which was subsequently passed to host_ntoa(). That
3010 means the last couple of bytes of an IPv6 address could be chopped if the
3011 ifreq contained only a normal sockaddr (14 bytes storage).
3013 18. Named domain lists were not supported in the hosts_treat_as_local option.
3014 An entry such as +xxxx was not recognized, and was treated as a literal
3017 19. Ensure that header lines added by a DATA ACL are included in the reject log
3018 if the ACL subsequently rejects the message.
3020 20. Upgrade the cramtest.pl utility script to use Digest::MD5 instead of just
3021 MD5 (which is deprecated).
3023 21. When testing a filter file using -bf, Exim was writing a message when it
3024 took the sender from a "From " line in the message, but it was not doing so
3025 when it took $return_path from a Return-Path: header line. It now does.
3027 22. If the contents of a "message" modifier for a "warn" ACL verb do not begin
3028 with a valid header line field name (a series of printing characters
3029 terminated by a colon, Exim now inserts X-ACL-Warn: at the beginning.
3031 23. Changed "disc" in the source to "disk" to conform to the documentation and
3032 the book and for uniformity.
3034 24. Ignore Sendmail's -Ooption=value command line item.
3036 25. When execve() failed while trying to run a command in a pipe transport,
3037 Exim was returning EX_UNAVAILBLE (69) from the subprocess. However, this
3038 could be confused with a return value of 69 from the command itself. This
3039 has been changed to 127, the value the shell returns if it is asked to run
3040 a non-existent command. The wording for the related log line suggests a
3041 non-existent command as the problem.
3043 26. If received_header_text expands to an empty string, do not add a Received:
3044 header line to the message. (Well, it adds a token one on the spool, but
3045 marks it "old" so that it doesn't get used or transmitted.)
3047 27. Installed eximstats 1.28 (addition of -nt option).
3049 28. There was no check for failure on the call to getsockname() in the daemon
3050 code. This can fail if there is a shortage of resources on the system, with
3051 ENOMEM, for example. A temporary error is now given on failure.
3053 29. Contrary to the C standard, it seems that in some environments, the
3054 equivalent of setlocale(LC_ALL, "C") is not obeyed at the start of a C
3055 program. Exim now does this explicitly; it affects the formatting of
3056 timestamps using strftime().
3058 30. If exiqsumm was given junk data, it threw up some uninitialized variable
3059 complaints. I've now initialized all the variables, to avoid this.
3061 32. Header lines added by a system filter were not being "seen" during
3062 transport-time rewrites.
3064 33. The info_callback() function passed to OpenSSL is set up with type void
3065 (*)(SSL *, int, int), as described somewhere. However, when calling the
3066 function (actually a macro) that sets it up, the type void(*)() is
3067 expected. I've put in a cast to prevent warnings from picky compilers.
3069 34. If a DNS black list lookup found a CNAME record, but there were no A
3070 records associated with the domain it pointed at, Exim crashed.
3072 35. If a DNS black list lookup returned more than one A record, Exim ignored
3073 all but the first. It now scans all returned addresses if a particular IP
3074 value is being sought. In this situation, the contents of the
3075 $dnslist_value variable are a list of all the addresses, separated by a
3078 36. Tightened up the rules for host name lookups using reverse DNS. Exim used
3079 to accept a host name and all its aliases if the forward lookup for any of
3080 them yielded the IP address of the incoming connection. Now it accepts only
3081 those names whose forward lookup yields the correct IP address. Any other
3082 names are discarded. This closes a loophole whereby a rogue DNS
3083 administrator could create reverse DNS records to break through a
3084 wildcarded host restriction in an ACL.
3086 37. If a user filter or a system filter that ran in a subprocess used any of
3087 the numerical variables ($1, $2 etc), or $thisaddress, in a pipe command,
3088 the wrong values were passed to the pipe command ($thisaddress had the
3089 value of $0, $0 had the value of $1, etc). This bug was introduced by
3090 change 4.11/101, and not discovered because I wrote an inadequate test. :-(
3092 38. Improved the line breaking for long SMTP error messages from ACLs.
3093 Previously, if there was no break point between 40 and 75 characters, Exim
3094 left the rest of the message alone. Two changes have been made: (a) I've
3095 reduced the minimum length to 35 characters; (b) if it can't find a break
3096 point between 35 and 75 characters, it looks ahead and uses the first one
3097 that it finds. This may give the occasional overlong line, but at least the
3098 remaining text gets split now.
3100 39. Change 82 of 4.11 was unimaginative. It assumed the limit on the number of
3101 file descriptors might be low, and that setting 1000 would always raise it.
3102 It turns out that in some environments, the limit is already over 1000 and
3103 that lowering it causes trouble. So now Exim takes care not to decrease it.
3105 40. When delivering a message, the value of $return_path is set to $sender_
3106 address at the start of routing (routers may change the value). By an
3107 oversight, this default was not being set up when an address was tested by
3108 -bt or -bv, which affected the outcome if any router or filter referred to
3111 41. The idea of the "warn" ACL verb is that it adds a header or writes to the
3112 log only when "message" or "log_message" are set. However, if one of the
3113 conditions was an address verification, or a call to a nested ACL, the
3114 messages generated by the underlying test were being passed through. This
3115 no longer happens. The underlying message is available in $acl_verify_
3116 message for both "message" and "log_message" expansions, so it can be
3117 passed through if needed.
3119 42. Added RFC 2047 interpretation of header lines for $h_ expansions, with a
3120 new expansion $bh_ to give the encoded byte string without charset
3121 translation. Translation happens only if iconv() is available; HAVE_ICONV
3122 indicates this at build time. HEADERS_CHARSET gives the charset to
3123 translate to; headers_charset can change it in the configuration, and
3124 "headers charset" can change it in an individual filter file.
3126 43. Now that we have a default RFC 2047 charset (see above), the code in Exim
3127 that creates RFC 2047 encoded "words" labels them as that charset instead
3128 of always using iso-8859-1. The cases are (i) the explicit ${rfc2047:
3129 expansion operator; (ii) when Exim creates a From: line for a local
3130 message; (iii) when a header line is rewritten to include a "phrase" part.
3132 44. Nasty bug in exiqsumm: the regex to skip already-delivered addresses was
3133 buggy, causing it to skip the first lines of messages whose message ID
3134 ended in 'D'. This would not have bitten before Exim release 4.14, because
3135 message IDs were unlikely to end in 'D' before then. The effect was to have
3136 incorrect size information for certain domains.
3138 45. #include "config.h" was missing at the start of the crypt16.c module. This
3139 caused trouble on Tru64 (aka OSF1) systems, because HAVE_CRYPT16 was not
3142 46. If there was a timeout during a "random" callout check, Exim treated it as
3143 a failure of the random address, and carried on sending RSET and the real
3144 address. If the delay was just some slowness somewhere, the response to the
3145 original RCPT would be taken as a response to RSET and so on, causing
3146 mayhem of various kinds.
3148 47. Change 50 for 4.20 was a heap of junk. I don't know what I was thinking
3149 when I implemented it. It didn't allow for the fact that some option values
3150 may legitimatetly be negative (e.g. size_addition), and it didn't even do
3151 the right test for positive values.
3153 48. Domain names in DNS records are case-independent. Exim always looks them up
3154 in lower case. Some resolvers return domain names in exactly the case they
3155 appear in the zone file, that is, they may contain uppercase letters. Not
3156 all resolvers do this - some return always lower case. Exim was treating a
3157 change of case by a resolver as a change of domain, similar to a widening
3158 of a domain abbreviation. This triggered its re-routing code and so it was
3159 trying to route what was effectively the same domain again. This normally
3160 caused routing to fail (because the router wouldn't handle the domain
3161 twice). Now Exim checks for this case specially, and just changes the
3162 casing of the domain that it ultimately uses when it transmits the message
3165 49. Added Sieve (RFC 3028) support, courtesy of Michael Haardt's contributed
3168 50. If a filter generated a file delivery with a non-absolute name (possible if
3169 no home directory exists for the router), the forbid_file option was not
3172 51. Added '&' feature to dnslists, to provide bit mask matching in addition to
3173 the existing equality matching.
3175 52. Exim was using ints instead of ino_t variables in some places where it was
3176 dealing with inode numbers.
3178 53. If TMPDIR is defined in Local/Makefile (default in src/EDITME is
3179 TMPDIR="/tmp"), Exim checks for the presence of an environment variable
3180 called TMPDIR, and if it finds it is different, it changes its value.
3182 54. The smtp_printf() function is now made available to local_scan() so
3183 additional output lines can be written before returning. There is also an
3184 smtp_fflush() function to enable the detection of a dropped connection.
3185 The variables smtp_input and smtp_batched_input are exported to
3188 55. Changed the default runtime configuration: the message "Unknown user"
3189 has been removed from the ACL, and instead placed on the localuser router,
3190 using the cannot_route_message feature. This means that any verification
3191 failures that generate their own messages won't get overridden. Similarly,
3192 the "Unrouteable address" message that was in the ACL for unverifiable
3193 relay addresses has also been removed.
3195 56. Added hosts_avoid_esmtp to the smtp transport.
3197 57. The exicyclog script was not checking for the esoteric option
3198 CONFIGURE_FILE_USE_EUID in the Local/Makefile. It now does this, but it
3199 will work only if exicyclog is run under the appropriate euid.
3201 58. Following a discussion on the list, the rules by which Exim recognises line
3202 endings on incoming messages have been changed. The -dropcr and drop_cr
3203 options are now no-ops, retained only for backwards compatibility. The
3204 following line terminators are recognized: LF CRLF CR. However, special
3205 processing applies to CR:
3207 (i) The sequence CR . CR does *not* terminate an incoming SMTP message,
3208 nor a local message in the state where . is a terminator.
3210 (ii) If a bare CR is encountered in a header line, an extra space is added
3211 after the line terminator so as not to end the header. The reasoning
3212 behind this is that bare CRs in header lines are most likely either
3213 to be mistakes, or people trying to play silly games.
3215 59. The size of a message, as listed by "-bp" or in the Exim monitor window,
3216 was being incorrectly given as 18 bytes larger than it should have been.
3217 This is a VOB (very old bug).
3219 60. This may never have affected anything current, but just in case it has:
3220 When the local host is found other than at the start of a list of hosts,
3221 the local host, those with the same MX, and any that follow, are discarded.
3222 When the list in question was part of a longer list of hosts, the following
3223 hosts (not currently being processed) were also being discarded. This no
3224 longer happens. I'm not sure if this situation could ever has previously
3227 61. Added the "/MX" feature to lists of hosts in the manualroute and query
3230 62. Whenever Exim generates a new message, it now adds an Auto-Submitted:
3231 header. This is something that is recommended in a new Internet Draft, and
3232 is something that is documented as being done by Sendmail. There are two
3233 possible values. For messages generated by the autoreply transport, Exim
3236 Auto-Submitted: auto-replied
3238 whereas for all other generated messages (e.g. bounces) it adds
3240 Auto-Submitted: auto-generated
3242 63. The "personal" condition in filters now includes a test for the
3243 Auto-Submitted: header. If it contains the string "auto-" the message it
3244 not considered personal.
3246 64. Added rcpt_include_affixes as a generic transport option.
3248 65. Added queue_only_override (default true).
3250 66. Added the syslog_duplication option.
3252 67. If what should have been the first header line of a message consisted of
3253 a space followed by a colon, Exim was mis-interpreting it as a header line.
3254 It isn't of course - it is syntactically invalid and should therefore be
3255 treated as the start of the message body. The misbehaviour could have
3256 caused a number of strange effects, including loss of data in subsequent
3257 header lines, and spool format errors.
3259 68. Formerly, the AUTH parameter on a MAIL command was trusted only if the
3260 client host had authenticated. This control can now be exercised by an ACL
3261 for more flexibility.
3263 69. By default, callouts do not happen when testing with -bh. There is now a
3264 variant, -bhc, which does actually run the callout code, including
3265 consulting and updating the callout cache.
3267 70. Added support for saslauthd authentication, courtesy of Alexander
3270 71. If statvfs() failed on the spool or log directories while checking their
3271 size for availability, Exim confusingly gave the error "space shortage".
3272 Furthermore, in debugging mode it crashed with a floating point exception.
3273 These checks are done if check_{spool,log}_{space,inodes} are set, and when
3274 an SMTP message arrives with SIZE= on the MAIL command. As this is a really
3275 serious problem, Exim now writes to the main and panic logs when this
3276 happens, with details of the failure. It then refuses to accept the
3277 incoming message, giving the message "spool directory problem" or "log
3278 directory problem" with a 421 code for SMTP messages.
3280 72. When Exim is about to re-exec itself, it ensures that the file descriptors
3281 0, 1, and 2 exist, because some OS complain for execs without them (see
3282 ChangeLog 4.05/30). If necessary, Exim opens /dev/null to use for these
3283 descriptors. However, the code omitted to check that the open succeeded,
3284 causing mysterious errors if for some reason the permissions on /dev/null
3285 got screwed. Now Exim writes a message to the main and panic logs, and
3286 bombs out if it can't open /dev/null.
3288 73. Re-vamped the way daemon_smtp_port, local_interfaces, and -oX work and
3289 interact so that it is all more flexible. It is supposed to remain
3290 backwards compatible. Also added extra_local_interfaces.
3292 74. Invalid data sent to a SPA (NTLM) server authenticator could cause the code
3293 to bomb out with an assertion failure - to the client this appears as a
3294 connection drop. This problem occurs in the part of the code that was taken
3295 from the Samba project. Fortunately, the assertion is in a very simple
3296 function, so I have fixed this by reproducing the function inline in the
3297 one place where it is called, and arranging for authentication to fail
3298 instead of killing the process with assert().
3300 75. The SPA client code was not working when the server requested OEM rather
3301 than Unicode encoding.
3303 76. Added code to make require_files with a specific uid setting more usable in
3304 the case where statting the file as root fails - usually a non-root-mounted
3305 NFS file system. When this happens and the failure is EACCES, Exim now
3306 forks a subprocess and does the per-uid checking as the relevant uid.
3308 77. Added process_log_path.
3310 78. If log_file_path was not explicitly set, a setting of check_log_space or
3311 check_log_inodes was ignored.
3313 79. If a space check for the spool or log partitions fails, the incident is now
3314 logged. Of course, in the latter case the data may get lost...
3316 80. Added the %p formatting code to string_format() so that it can be used to
3317 print addresses in debug_print(). Adjusted all the address printing in the
3318 debugging in store.c to use %p rather than %d.
3320 81. There was a concern that a line of code in smtp_in.c could overflow a
3321 buffer if a HELO/EHLO command was given followed by 500 or so spaces. As
3322 initially expressed, the concern was not well-founded, because trailing
3323 spaces are removed early. However, if the trailing spaces were followed by
3324 a NULL, they did not get removed, so the overflow was possible. Two fixes
3327 (a) I re-wrote the offending code in a cleaner fashion.
3328 (b) If an incoming SMTP command contains a NULL character, it is rejected
3331 82. When Exim changes uid/gid to the Exim user at daemon start time, it now
3332 runs initgroups(), so that if the Exim user is in any additional groups,
3333 they will be used during message reception.
3339 The change log for 4.20 and earlier releases has been archived.
projects / exim.git / blob