1 $Cambridge: exim/doc/doc-txt/ChangeLog,v 1.172 2005/06/27 10:40:14 ph10 Exp $
3 Change log file for Exim from version 4.21
4 -------------------------------------------
10 TF/01 Added support for Client SMTP Authorization. See NewStuff for details.
12 PH/01 When a transport filter timed out in a pipe delivery, and the pipe
13 command itself ended in error, the underlying message about the transport
14 filter timeout was being overwritten with the pipe command error. Now the
15 underlying error message should be appended to the second error message.
17 TK/01 Fix poll() being unavailable on Mac OSX 10.2.
19 PH/02 Reduce the amount of output that "make" produces by default. Full output
20 can still be requested.
22 PH/03 The warning log line about a condition test deferring for a "warn" verb
23 was being output only once per connection, rather than after each
24 occurrence (because it was using the same function as for successful
25 "warn" verbs). This seems wrong, so I have changed it.
27 TF/02 Two buglets in acl.c which caused Exim to read a few bytes of memory that
28 it should not have, which might have caused a crash in the right
29 circumstances, but probably never did.
31 PH/04 Installed a modified version of Tony Finch's patch to make submission
32 mode fix the return path as well as the Sender: header line, and to
33 add a /name= option so that you can make the user's friendly name appear
36 TF/03 Added the control = fakedefer ACL modifier.
38 TF/04 Added the ratelimit ACL condition. See NewStuff for details. Thanks to
39 Mark Lowes for thorough testing.
41 TK/02 Rewrote SPF support to work with libspf2 versions >1.2.0.
43 TK/03 Merged latest SRS patch from Miles Wilton.
45 PH/05 There's a shambles in IRIX6 - it defines EX_OK in unistd.h which conflicts
46 with the definition in sysexits.h (which is #included earlier).
47 Fortunately, Exim does not actually use EX_OK. The code used to try to
48 preserve the sysexits.h value, by assumimg that macro definitions were
49 scanned for macro replacements. I have been disabused of this notion,
50 so now the code just undefines EX_OK before #including unistd.h.
52 PH/06 There is a timeout for writing blocks of data, set by, e.g. data_timeout
53 in the smtp transport. When a block could not be written in a single
54 write() function, the timeout was being re-applied to each part-write.
55 This seems wrong - if the receiver was accepting one byte at a time it
56 would take for ever. The timeout is now adjusted when this happens. It
57 doesn't have to be particularly precise.
59 TK/04 Added simple SPF lookup method in EXPERIMENTAL_SPF. See NewStuff for
60 details. Thanks to Chris Webb <chris@arachsys.com> for the patch!
62 PH/07 Added "fullpostmaster" verify option, which does a check to <postmaster>
63 without a domain if the check to <postmaster@domain> fails.
65 SC/01 Eximstats: added -xls and the ability to specify output files
66 (patch written by Frank Heydlauf).
68 SC/02 Eximstats: use FileHandles for outputing results.
70 SC/03 Eximstats: allow any combination of xls, txt, and html output.
72 SC/04 Eximstats: fixed display of large numbers with -nvr option
74 SC/05 Eximstats: fixed merging of reports with empty tables.
76 SC/06 Eximstats: added the -include_original_destination flag
78 SC/07 Eximstats: removed tabs and trailing whitespace.
80 TK/05 Malware: Improve on aveserver error handling. Patch from Alex Miller.
82 TK/06 MBOX spool code: Add real "From " MBOX separator line
83 so the .eml file is really in mbox format (even though
84 most programs do not really care). Patch from Alex Miller.
86 TK/07 MBOX spool code: Add X-Envelope-From: and X-Envelope-To: headers.
87 The latter is generated from $received_to and is only set if the
88 message has one envelope recipient. SA can use these headers,
89 obviously out-of-the-box. Patch from Alex Miller.
91 PH/08 The ${def test on a variable was returning false if the variable's
92 value was "0", contrary to what the specification has always said!
93 The result should be true unless the variable is empty.
95 PH/09 The syntax error of a character other than { following "${if
96 def:variable_name" (after optional whitespace) was not being diagnosed.
97 An expansion such as ${if def:sender_ident:{xxx}{yyy}} in which an
98 accidental colon was present, for example, could give incorrect results.
100 PH/10 Tidied the code in a number of places where the st_size field of a stat()
101 result is used (not including appendfile, where other changes are about
104 PH/11 Upgraded appendfile so that quotas larger than 2G are now supported.
105 This involved changing a lot of size variables from int to off_t. It
106 should work with maildirs and everything.
108 TK/08 Apply fix provided by Michael Haardt to prevent deadlock in case of
109 spamd dying while we are connected to it.
111 TF/05 Fixed a ${extract error message typo reported by Jeremy Harris
114 PH/12 Applied Alex Kiernan's patch for the API change for the error callback
115 function for BDB 4.3.
117 PH/13 Changed auto_thaw such that it does not apply to bounce messages.
119 PH/14 Imported PCRE 6.0; this was more than just a trivial operation because
120 the sources for PCRE have been re-arranged and more files are now
123 PH/15 The code I had for printing potentially long long variables in PH/11
124 above was not the best (it lost precision). The length of off_t variables
125 is now inspected at build time, and an appropriate printing format (%ld
126 or %lld) is chosen and #defined by OFF_T_FMT. We also define LONGLONG_T
127 to be "long long int" or "long int". This is needed for the internal
128 formatting function string_vformat().
130 PH/16 Applied Matthew Newton's patch to exicyclog: "If log_file_path is set in
131 the configuration file to be ":syslog", then the script "guesses" where
132 the logs files are, rather than using the compiled in default. In our
133 case the guess is not the same as the compiled default, so the script
134 suddenly stopped working when I started to use syslog. The patch checks
135 to see if log_file_path is "". If so, it attempts to read it from exim
136 with no configuration file to get the compiled in version, before it
137 falls back to the previous guessing code."
139 TK/09 Added "prvs" and "prvscheck" expansion items. These help a lot with
140 implementing BATV in an Exim configuration. See NewStuff for the gory
143 PH/17 Applied Michael Haardt's patch for HP-UX, affecting only the os.h and
144 Makefile that are specific to HP-UX.
146 PH/18 If the "use_postmaster" option was set for a recipient callout together
147 with the "random" option, the postmaster address was used as the MAIL
148 FROM address for the random test, but not for the subsequent recipient
149 test. It is now used for both.
151 PH/19 Applied Michael Haardt's patch to update Sieve to RFC3028bis. "The
152 patch removes a few documentation additions to RFC 3028, because the
153 latest draft now contains them. It adds the new en;ascii-case comparator
154 and a new error check for 8bit text in MIME parts. Comparator and
155 require names are now matched exactly. I enabled the subaddress
156 extension, but it is not well tested yet (read: it works for me)."
158 PH/20 Added macros for time_t as for off_t (see PH/15 above) and used them to
159 rework some of the code of TK/09 above to avoid the hardwired use of
160 "%lld" and "long long". Replaced the call to snprintf() with a call to
163 PH/21 Added another message to those in 4.51/PH/42, namely "All relevant MX
164 records point to non-existent hosts".
166 PH/22 Fixed some oversights/typos causing bugs when Exim is compiled with
167 experimental DomainKeys support:
169 (1) The filter variables $n0-$n9 and $sn0-$sn9 were broken.
170 (2) On an error such as an illegally used "control", the wrong name for
171 the control was given.
173 These problems did NOT occur unless DomainKeys support was compiled.
175 PH/23 Added daemon_startup_retries and daemon_startup_sleep.
177 PH/24 Added ${if match_ip condition.
179 PH/25 Put debug statements on either side of calls to EXIM_DBOPEN() for hints
180 databases so that it will be absolutely obvious if a crash occurs in the
181 DB library. This is a regular occurrence (often caused by mis-matched
184 PH/26 Insert a lot of missing (void) casts for functions such as chown(),
185 chmod(), fcntl(), and sscanf(). These were picked up on a user's system
186 that detects such things. There doesn't seem to be a gcc warning option
187 for this - only an attribute that has to be put on the function's
188 prototype. I'm sure I haven't caught all of these, but it's a start.
190 PH/27 If a dnslookup or manualroute router is set with verify=only, it need not
191 specify a transport. However, if an address that was verified by such a
192 router was the subject of a callout, Exim crashed because it tried to
193 read the rcpt_include_affixes from the non-existent transport. Now it
194 just assumes that the setting of that option is false. This bug was
195 introduced by 4.51/PH/31.
197 PH/28 Changed -d+all to exclude +memory, because that information is very
198 rarely of interest, but it makes the output a lot bigger. People tend to
199 do -d+all out of habit.
201 PH/29 Removed support for the Linux-libc5 build, as it is obsolete and the
202 code in os-type was giving problems when libc.so lives in lib64, like on
210 TK/01 Added Yahoo DomainKeys support via libdomainkeys. See
211 doc/experimental-spec.txt for details. (http://domainkeys.sf.net)
213 TK/02 Fix ACL "control" statement not being available in MIME ACL.
215 TK/03 Fix ACL "regex" condition not being available in MIME ACL.
217 PH/01 Installed a patch from the Sieve maintainer that allows -bf to be used
218 to test Sieve filters that use "vacation".
220 PH/02 Installed a slightly modified version of Nikos Mavrogiannopoulos' patch
221 that changes the way the GnuTLS parameters are stored in the cache file.
222 The new format can be generated externally. For backward compatibility,
223 if the data in the cache doesn't make sense, Exim assumes it has read an
224 old-format file, and it generates new data and writes a new file. This
225 means that you can't go back to an older release without removing the
228 PH/03 A redirect router that has both "unseen" and "one_time" set does not
229 work if there are any delivery delays because "one_time" forces the
230 parent to be marked "delivered", so its unseen clone is never tried
231 again. For this reason, Exim now forbids the simultaneous setting of
234 PH/04 Change 4.11/85 fixed an obscure bug concerned with addresses that are
235 redirected to themselves ("homonym" addresses). Read the long ChangeLog
236 entry if you want to know the details. The fix, however, neglected to
237 consider the case when local delivery batching is involved. The test for
238 "previously delivered" was not happening when checking to see if an
239 address could be batched with a previous (undelivered) one; under
240 certain circumstances this could lead to multiple deliveries to the same
243 PH/05 Renamed the macro SOCKLEN_T as EXIM_SOCKLEN_T because AIX uses SOCKLEN_T
244 in its include files, and this causes problems building Exim.
246 PH/06 A number of "verify =" ACL conditions have no options (e.g. verify =
247 header_syntax) but Exim was just ignoring anything given after a slash.
248 In particular, this caused confusion with an attempt to use "verify =
249 reverse_host_lookup/defer_ok". An error is now given when options are
250 supplied for verify items that do not have them. (Maybe reverse_host_
251 lookup should have a defer_ok option, but that's a different point.)
253 PH/07 Increase the size of the buffer for incoming SMTP commands from 512 (as
254 defined by RFC 821) to 2048, because there were problems with some AUTH
255 commands, and RFC 1869 says the size should be increased for extended
256 SMTP commands that take arguments.
258 PH/08 Added ${dlfunc dynamically loaded function for expansion (code from Tony
261 PH/09 Previously, an attempt to use ${perl when it wasn't compiled gave an
262 "unknown" error; now it says that the functionality isn't in the binary.
264 PH/10 Added a nasty fudge to try to recognize and flatten LDAP passwords in
265 an address' error message when a string expansion fails (syntax or
266 whatever). Otherwise the password may appear in the log. Following change
267 PH/42 below, there is no longer a chance of it appearing in a bounce
270 PH/11 Installed exipick version 20050225.0 from John Jetmore.
272 PH/12 If the last host in a fallback_hosts list was multihomed, only the first
273 of its addresses was ever tried. (Bugzilla bug #2.)
275 PH/13 If "headers_add" in a transport didn't end in a newline, Exim printed
276 the result incorrectly in the debug output. (It correctly added a newline
277 to what was transported.)
279 TF/01 Added $received_time.
281 PH/14 Modified the default configuration to add an acl_smtp_data ACL, with
282 commented out examples of how to interface to a virus scanner and to
283 SpamAssassin. Also added commented examples of av_scanner and
284 spamd_address settings.
286 PH/15 Further to TK/02 and TK/03 above, tidied up the tables of what conditions
287 and controls are allowed in which ACLs. There were a couple of minor
288 errors. Some of the entries in the conditions table (which is a table of
289 where they are NOT allowed) were getting very unwieldy; rewrote them as a
290 negation of where the condition IS allowed.
292 PH/16 Installed updated OS/os.c-cygwin from the Cygwin maintainer.
294 PH/17 The API for radiusclient changed at release 0.4.0. Unfortunately, the
295 header file does not have a version number, so I've had to invent a new
296 value for RADIUS_LIB_TYPE, namely "RADIUSCLIENTNEW" to request the new
297 API. The code is untested by me (my Linux distribution still has 0.3.2 of
298 radiusclient), but it was contributed by a Radius user.
300 PH/18 Installed Lars Mainka's patch for the support of CRL collections in
301 files or directories, for OpenSSL.
303 PH/19 When an Exim process that is running as root has to create an Exim log
304 file, it does so in a subprocess that runs as exim:exim so as to get the
305 ownership right at creation (otherwise, other Exim processes might see
306 the file with the wrong ownership). There was no test for failure of this
307 fork() call, which would lead to the process getting stuck as it waited
308 for a non-existent subprocess. Forks do occasionally fail when resources
309 run out. I reviewed all the other calls to fork(); they all seem to check
312 PH/20 When checking for unexpected SMTP input at connect time (before writing
313 the banner), Exim was not dealing correctly with a non-positive return
314 from the read() function. If the client had disconnected by this time,
315 the result was a log entry for a synchronization error with an empty
316 string after "input=" when read() returned zero. If read() returned -1
317 (an event I could not check), uninitialized data bytes were printed.
318 There were reports of junk text (parts of files, etc) appearing after
321 PH/21 Added acl_not_smtp_mime to allow for MIME scanning for non-SMTP messages.
323 PH/22 Added support for macro redefinition, and (re)definition in between
324 driver and ACL definitions.
326 PH/23 The cyrus_sasl authenticator was expanding server_hostname, but then
327 forgetting to use the resulting value; it was using the unexpanded value.
329 PH/24 The cyrus_sasl authenticator was advertising mechanisms for which it
330 hadn't been configured. The fix is from Juergen Kreileder, who
331 understands it better than I do:
333 "Here's what I see happening with three configured cyrus_sasl
334 authenticators configured (plain, login, cram-md5):
336 On startup auth_cyrus_sasl_init() gets called for each of these.
337 This means three calls to sasl_listmech() without a specified mech_list.
338 => SASL tests which mechs of all available mechs actually work
339 => three warnings about OTP not working
340 => the returned list contains: plain, login, cram-md5, digest-md5, ...
342 With the patch, sasl_listmech() also gets called three times. But now
343 SASL's mech_list option is set to the server_mech specified in the the
344 authenticator. Or in other words, the answer from sasl_listmech()
345 gets limited to just the mech you're testing for (which is different
347 => the return list contains just 'plain' or 'login', 'cram-md5' or
348 nothing depending on the value of ob->server_mech.
350 I've just tested the patch: Authentication still works fine,
351 unavailable mechs specified in the exim configuration are still
352 caught, and the auth.log warnings about OTP are gone."
354 PH/25 When debugging is enabled, the contents of the command line are added
355 to the debugging output, even when log_selector=+arguments is not
358 PH/26 Change scripts/os-type so that when "uname -s" returns just "GNU", the
359 answer is "GNU", and only if the return is "GNU/something" is the answer
362 PH/27 $acl_verify_message is now set immediately after the failure of a
363 verification in an ACL, and so is available in subsequent modifiers. In
364 particular, the message can be preserved by coding like this:
366 warn !verify = sender
367 set acl_m0 = $acl_verify_message
369 Previously, $acl_verify_message was set only while expanding "message"
370 and "log_message" when a very denied access.
372 PH/28 Modified OS/os.c-Linux with
374 -#ifndef OS_LOAD_AVERAGE
375 +#if !defined(OS_LOAD_AVERAGE) && defined(__linux__)
377 to make Exim compile on kfreebsd-gnu. (I'm totally confused about the
378 nomenclature these days.)
380 PH/29 Installed patch from the Sieve maintainer that adds the options
381 sieve_useraddress and sieve_subaddress to the redirect router.
383 PH/30 In these circumstances:
384 . Two addresses routed to the same list of hosts;
385 . First host does not offer TLS;
386 . First host accepts first address;
387 . First host gives temporary error to second address;
388 . Second host offers TLS and a TLS session is established;
389 . Second host accepts second address.
390 Exim incorrectly logged both deliveries with the TLS parameters (cipher
391 and peerdn, if requested) that were in fact used only for the second
394 PH/31 When doing a callout as part of verifying an address, Exim was not paying
395 attention to any local part prefix or suffix that was matched by the
396 router that accepted the address. It now behaves in the same way as it
397 does for delivery: the affixes are removed from the local part unless
398 rcpt_include_affixes is set on the transport.
400 PH/32 Add the sender address, as F=<...>, to the log line when logging a
401 timeout during the DATA phase of an incoming message.
403 PH/33 Sieve envelope tests were broken for match types other than :is. I have
404 applied a patch sanctioned by the Sieve maintainer.
406 PH/34 Change 4.50/80 broke Exim in that it could no longer handle cases where
407 the uid or gid is negative. A case of a negative gid caused this to be
408 noticed. The fix allows for either to be negative.
410 PH/35 ACL_WHERE_MIME is now declared unconditionally, to avoid too much code
411 clutter, but the tables that are indexed by ACL_WHERE_xxx values had been
414 PH/36 The change PH/12 above was broken. Fixed it.
416 PH/37 Exim used to check for duplicate addresses in the middle of routing, on
417 the grounds that routing the same address twice would always produce the
418 same answer. This might have been true once, but it is certainly no
419 longer true now. Routing a child address may depend on the previous
420 routing that produced that child. Some complicated redirection strategies
421 went wrong when messages had multiple recipients, and made Exim's
422 behaviour dependent on the order in which the addresses were given.
424 I have moved the duplicate checking until after the routing is complete.
425 Exim scans the addresses that are assigned to local and remote
426 transports, and removes any duplicates. This means that more work will be
427 done, as duplicates will always all be routed, but duplicates are
428 presumably rare, so I don't expect this is of any significance.
430 For deliveries to pipes, files, and autoreplies, the duplicate checking
431 still happens during the routing process, since they are not going to be
434 PH/38 Installed a patch from Ian Freislich, with the agreement of Tom Kistner.
435 It corrects a timeout issue with spamd. This is Ian's comment: "The
436 background is that sometimes spamd either never reads data from a
437 connection it has accepted, or it never writes response data. The exiscan
438 spam.[ch] uses a 3600 second timeout on spamd socket reads, further, it
439 blindly assumes that writes won't block so it may never time out."
441 PH/39 Allow G after quota size as well as K and M.
443 PH/40 The value set for $authenticated_id in an authenticator may not contain
444 binary zeroes or newlines because the value is written to log lines and
445 to spool files. There was no check on this. Now the value is run through
446 the string_printing() function so that such characters are converted to
447 printable escape sequences.
449 PH/41 $message_linecount is a new variable that contains the total number of
450 lines in the message. Compare $body_linecount, which is the count for the
453 PH/42 Exim no longer gives details of delivery errors for specific addresses in
454 bounce and delay warning messages, except in certain special cases, which
457 (a) An SMTP error message from a remote host;
458 (b) A message specified in a :fail: redirection;
459 (c) A message specified in a "fail" command in a system filter;
460 (d) A message specified in a FAIL return from the queryprogram router;
461 (e) A message specified by the cannot_route_message router option.
463 In these cases only, Exim does include the error details in bounce and
464 warning messages. There are also a few cases where bland messages such
465 as "unrouteable address" or "local delivery error" are given.
467 PH/43 $value is now also set for the "else" part of a ${run expansion.
469 PH/44 Applied patch from the Sieve maintainer: "The vacation draft is still
470 being worked on, but at least Exim now implements the latest version to
473 PH/45 In a pipe transport, although a timeout while waiting for the pipe
474 process to complete was treated as a delivery failure, a timeout while
475 writing the message to the pipe was logged, but erroneously treated as a
476 successful delivery. Such timeouts include transport filter timeouts. For
477 consistency with the overall process timeout, these timeouts are now
478 treated as errors, giving rise to delivery failures by default. However,
479 there is now a new Boolean option for the pipe transport called
480 timeout_defer, which, if set TRUE, converts the failures into defers for
481 both kinds of timeout. A transport filter timeout is now identified in
484 PH/46 The "scripts/Configure-config.h" script calls "make" at one point. On
485 systems where "make" and "gmake" are different, calling "gmake" at top
486 level broke things. I've arranged for the value of $(MAKE) to be passed
487 from the Makefile to this script so that it can call the same version of
491 A note about Exim versions 4.44 and 4.50
492 ----------------------------------------
494 Exim 4.50 was meant to be the next release after 4.43. It contains a lot of
495 changes of various kinds. As a consequence, a big documentation update was
496 needed. This delayed the release for rather longer than seemed good, especially
497 in the light of a couple of (minor) security issues. Therefore, the changes
498 that fixed bugs were backported into 4.43, to create a 4.44 maintenance
499 release. So 4.44 and 4.50 are in effect two different branches that both start
502 I have left the 4.50 change log unchanged; it contains all the changes since
503 4.43. The change log for 4.44 is below; many of its items are identical to
504 those for 4.50. This seems to be the most sensible way to preserve the
505 historical information.
511 1. Minor wording change to the doc/README.SIEVE file.
513 2. Change 4.43/35 introduced a bug: if quota_filecount was set, the
514 computation of the current number of files was incorrect.
516 3. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
517 bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
520 4. Give more explanation in the error message when the command for a transport
521 filter fails to execute.
523 5. There are several places where Exim runs a non-Exim command in a
524 subprocess. The SIGUSR1 signal should be disabled for these processes. This
525 was being done only for the command run by the queryprogram router. It is
526 now done for all such subprocesses. The other cases are: ${run, transport
527 filters, and the commands run by the lmtp and pipe transports.
529 6. Added CONFIGURE_GROUP build-time option.
531 7. Some older OS have a limit of 256 on the maximum number of file
532 descriptors. Exim was using setrlimit() to set 1000 as a large value
533 unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
534 systems. I've change it so that if it can't get 1000, it tries for 256.
536 8. "control=submission" was allowed, but had no effect, in a DATA ACL. This
537 was an oversight, and furthermore, ever since the addition of extra
538 controls (e.g. 4.43/32), the checks on when to allow different forms of
539 "control" were broken. There should now be diagnostics for all cases when a
540 control that does not make sense is encountered.
542 9. Added the /retain_sender option to "control=submission".
544 10. $recipients is now available in the predata ACL (oversight).
546 11. Tidy the search cache before the fork to do a delivery from a message
547 received from the command line. Otherwise the child will trigger a lookup
548 failure and thereby defer the delivery if it tries to use (for example) a
549 cached ldap connection that the parent has called unbind on.
551 12. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
552 of $address_data from the recipient verification was clobbered by the
555 13. The value of address_data from a sender verification is now available in
556 $sender_address_data in subsequent conditions in the ACL statement.
558 14. Added forbid_sieve_filter and forbid_exim_filter to the redirect router.
560 15. Added a new option "connect=<time>" to callout options, to set a different
563 16. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
564 was its contents. (It was OK if the option was not defined at all.)
566 17. A "Completed" log line is now written for messages that are removed from
567 the spool by the -Mrm option.
569 18. New variables $sender_verify_failure and $recipient_verify_failure contain
570 information about exactly what failed.
572 19. Added -dd to debug only the daemon process.
574 20. Incorporated Michael Haardt's patch to ldap.c for improving the way it
575 handles timeouts, both on the server side and network timeouts. Renamed the
576 CONNECT parameter as NETTIMEOUT (but kept the old name for compatibility).
578 21. The rare case of EHLO->STARTTLS->HELO was setting the protocol to "smtp".
579 It is now set to "smtps".
581 22. $host_address is now set to the target address during the checking of
584 23. When checking ignore_target_hosts for an ipliteral router, no host name was
585 being passed; this would have caused $sender_host_name to have been used if
586 matching the list had actually called for a host name (not very likely,
587 since this list is usually IP addresses). A host name is now passed as
590 24. Changed the calls that set up the SIGCHLD handler in the daemon to use the
591 code that specifies a non-restarting handler (typically sigaction() in
592 modern systems) in an attempt to fix a rare and obscure crash bug.
594 25. Narrowed the window for a race in the daemon that could cause it to ignore
595 SIGCHLD signals. This is not a major problem, because they are used only to
596 wake it up if nothing else does.
598 26. A malformed maildirsize file could cause Exim to calculate negative values
599 for the mailbox size or file count. Odd effects could occur as a result.
600 The maildirsize information is now recalculated if the size or filecount
603 27. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
604 support for a long time. Removed HAVE_SYS_VFS_H.
606 28. Installed the latest version of exipick from John Jetmore.
608 29. In an address list, if the pattern was not a regular expression, an empty
609 subject address (from a bounce message) matched only if the pattern was an
610 empty string. Non-empty patterns were not even tested. This was the wrong
611 because it is perfectly reasonable to use an empty address as part of a
612 database query. An empty address is now tested by patterns that are
613 lookups. However, all the other forms of pattern expect the subject to
614 contain a local part and a domain, and therefore, for them, an empty
615 address still always fails if the pattern is not itself empty.
617 30. Exim went into a mad DNS loop when attempting to do a callout where the
618 host was specified on an smtp transport, and looking it up yielded more
621 31. Re-factored the code for checking spool and log partition space into a
622 function that finds that data and another that does the check. The former
623 is then used to implement four new variables: $spool_space, $log_space,
624 $spool_inodes, and $log_inodes.
626 32. The RFC2047 encoding function was originally intended for short strings
627 such as real names; it was not keeping to the 75-character limit for
628 encoded words that the RFC imposes. It now respects the limit, and
629 generates multiple encoded words if necessary. To be on the safe side, I
630 have increased the buffer size for the ${rfc2047: expansion operator from
633 33. It is now permitted to omit both strings after an "if" condition; if the
634 condition is true, the result is "true". As before, when the second string
635 is omitted, a false condition yields an empty string. This makes it less
636 cumbersome to write custom ACL and router conditions.
638 34. Failure to deliver a bounce message always caused it to be frozen, even if
639 there was an errors_to setting on the router. The errors_to setting is now
642 35. If an IPv6 address is given for -bh or -bhc, it is now converted to the
643 canonical form (fully expanded) before being placed in
644 $sender_host_address.
646 36. The table in the code that translates DNS record types into text (T_A to
647 "A" for instance) was missing entries for NS and CNAME. It is just possible
648 that this could have caused confusion if both these types were looked up
649 for the same domain, because the text type is used as part of Exim's
650 per-process caching. But the chance of anyone hitting this buglet seems
653 37. The dnsdb lookup has been extended in a number of ways.
655 (1) There is a new type, "zns", which walks up the domain tree until it
656 finds some nameserver records. It should be used with care.
658 (2) There is a new type, "mxh", which is like "mx" except that it returns
659 just the host names, not the priorities.
661 (3) It is now possible to give a list of domains (or IP addresses) to be
662 looked up. The behaviour when one of the lookups defers can be
663 controlled by a keyword.
665 (4) It is now possible to specify the separator character for use when
666 multiple records are returned.
668 38. The dnslists ACL condition has been extended: it is now possible to supply
669 a list of IP addresses and/or domains to be looked up in a particular DNS
672 39. Added log_selector=+queue_time_overall.
674 40. When running the queue in the test harness, wait just a tad after forking a
675 delivery process, to get repeatability of debugging output.
677 41. Include certificate and key file names in error message when GnuTLS fails
678 to set them up, because the GnuTLS error message doesn't include the name
679 of the failing file when there is a problem reading it.
681 42. Allow both -bf and -bF in the same test run.
683 43. Did the same fix as 41 above for OpenSSL, which had the same infelicity.
685 44. The "Exiscan patch" is now merged into the mainline Exim source.
687 45. Sometimes the final signoff response after QUIT could fail to get
688 transmitted in the non-TLS case. Testing !tls_active instead of tls_active
689 < 0 before doing a fflush(). This bug looks as though it goes back to the
690 introduction of TLS in release 3.20, but "sometimes" must have been rare
691 because the tests only now provoked it.
693 46. Reset the locale to "C" after calling embedded Perl, in case it was changed
694 (this can affect the format of dates).
696 47. exim_tidydb, when checking for the continued existence of a message for
697 which it has found a message-specific retry record, was not finding
698 messages that were in split spool directories. Consequently, it was
699 deleting retry records that should have stayed in existence.
701 48. Steve fixed some bugs in eximstats.
703 49. The SPA authentication driver was not abandoning authentication and moving
704 on to the next authenticator when an expansion was forced to fail,
705 contradicting the general specification for all authenticators. Instead it
706 was generating a temporary error. It now behaves as specified.
708 50. The default ordering of permitted cipher suites for GnuTLS was pessimal
709 (the order specifies the preference for clients). The order is now AES256,
710 AES128, 3DES, ARCFOUR128.
712 51. Small patch to Sieve code - explicitly set From: when generating an
715 52. Exim crashed if a remote delivery caused a very long error message to be
716 recorded - for instance if somebody sent an entire SpamAssassin report back
717 as a large number of 550 error lines. This bug was coincidentally fixed by
718 increasing the size of one of Exim's internal buffers (big_buffer) that
719 happened as part of the Exiscan merge. However, to be on the safe side, I
720 have made the code more robust (and fixed the comments that describe what
723 53. Now that there can be additional text after "Completed" in log lines (if
724 the queue_time_overall log selector is set), a one-byte patch to exigrep
725 was needed to allow it to recognize "Completed" as not the last thing in
728 54. The LDAP lookup was not handling a return of LDAP_RES_SEARCH_REFERENCE. A
729 patch that reportedly fixes this has been added. I am not expert enough to
730 create a test for it. This is what the patch creator wrote:
732 "I found a little strange behaviour of ldap code when working with
733 Windows 2003 AD Domain, where users was placed in more than one
734 Organization Units. When I tried to give exim partial DN, the exit code
735 of ldap_search was unknown to exim because of LDAP_RES_SEARCH_REFERENCE.
736 But simultaneously result of request was absolutely normal ldap result,
737 so I produce this patch..."
739 Later: it seems that not all versions of LDAP support LDAP_RES_SEARCH_
740 REFERENCE, so I have modified the code to exclude the patch when that macro
743 55. Some experimental protocols are using DNS PTR records for new purposes. The
744 keys for these records are domain names, not reversed IP addresses. The
745 dnsdb PTR lookup now tests whether its key is an IP address. If not, it
746 leaves it alone. Component reversal etc. now happens only for IP addresses.
749 56. Improve error message when ldap_search() fails in OpenLDAP or Solaris LDAP.
751 57. Double the size of the debug message buffer (to 2048) so that more of very
752 long debug lines gets shown.
754 58. The exicyclog utility now does better if the number of log files to keep
755 exceeds 99. In this case, it numbers them 001, 002 ... instead of 01, 02...
757 59. Two changes related to the smtp_active_hostname option:
759 (1) $smtp_active_hostname is now available as a variable.
760 (2) The default for smtp_banner uses $smtp_active_hostname instead
761 of $primary_hostname.
763 60. The host_aton() function is supposed to be passed a string that is known
764 to be a valid IP address. However, in the case of IPv6 addresses, it was
765 not checking this. This is a hostage to fortune. Exim now panics and dies
766 if the condition is not met. A case was found where this could be provoked
767 from a dnsdb PTR lookup with an IPv6 address that had more than 8
768 components; fortuitously, this particular loophole had already been fixed
769 by change 4.50/55 above.
771 If there are any other similar loopholes, the new check in host_aton()
772 itself should stop them being exploited. The report I received stated that
773 data on the command line could provoke the exploit when Exim was running as
774 exim, but did not say which command line option was involved. All I could
775 find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
779 61. There was a buffer overflow vulnerability in the SPA authentication code
780 (which came originally from the Samba project). I have added a test to the
781 spa_base64_to_bits() function which I hope fixes it.
784 62. Configuration update for GNU/Hurd and variations. Updated Makefile-GNU and
785 os.h-GNU, and added configuration files for GNUkFreeBSD and GNUkNetBSD.
787 63. The daemon start-up calls getloadavg() while still root for those OS that
788 need the first call to be done as root, but it missed one case: when
789 deliver_queue_load_max is set with deliver_drop_privilege. This is
790 necessary for the benefit of the queue runner, because there is no re-exec
791 when deliver_drop_privilege is set.
793 64. A call to exiwhat cut short delays set up by "delay" modifiers in ACLs.
796 65. Caching of lookup data for "hosts =" ACL conditions, when a named host list
797 was in use, was not putting the data itself into the right store pool;
798 consequently, it could be overwritten for a subsequent message in the same
799 SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
802 66. Added hosts_max_try_hardlimit to the smtp transport, default 50.
804 67. The string_is_ip_address() function returns 0, 4, or 6, for "no an IP
805 address", "IPv4 address", and "IPv6 address", respectively. Some calls of
806 the function were treating the return as a boolean value, which happened to
807 work because 0=false and not-0=true, but is not correct code.
809 68. The host_aton() function was not handling scoped IPv6 addresses (those
810 with, for example, "%eth0" on the end) correctly.
812 69. Fixed some compiler warnings in acl.c for the bitmaps specified with
813 negated items (that is, ~something) in unsigned ints. Some compilers
814 apparently mutter when there is no cast.
816 70. If an address verification called from an ACL failed, and did not produce a
817 user-specific message (i.e. there was only a "system" message), nothing was
818 put in $acl_verify_message. In this situation, it now puts the system
821 71. Change 4.23/11 added synchronization checking at the start of an SMTP
822 session; change 4.31/43 added the unwanted input to the log line - except
823 that it did not do this in the start of session case. It now does.
825 72. After a timeout in a callout SMTP session, Exim still sent a QUIT command.
826 This is wrong and can cause the other end to generate a synchronization
827 error if it is another Exim or anything else that does the synchronization
828 check. A QUIT command is no longer sent after a timeout.
830 73. $host_lookup_deferred has been added, to make it easier to detect DEFERs
833 74. The defer_ok option of callout verification was not working if it was used
834 when verifying addresses in header lines, that is, for this case:
836 verify = header_sender/callout=defer_ok
838 75. A backgrounded daemon closed stdin/stdout/stderr on entry; this meant that
839 those file descriptors could be used for SMTP connections. If anything
840 wrote to stderr (the example that came up was "warn" in embedded Perl), it
841 could be sent to the SMTP client, causing chaos. The daemon now opens
842 stdin, stdout, and stderr to /dev/null when it puts itself into the
845 76. Arrange for output from Perl's "warn" command to be written to Exim's main
846 log by default. The user can override this with suitable Perl magic.
848 77. The use of log_message on a "discard" ACL verb, which is supposed to add to
849 the log message when discard triggers, was not working for the DATA ACL or
850 for the non-SMTP ACL.
852 78. Error message wording change in sieve.c.
854 79. If smtp_accept_max_per_host was set, the number of connections could be
855 restricted to fewer than expected, because the daemon was trying to set up
856 a new connection before checking whether the processes handling previous
857 connections had finished. The check for completed processes is now done
858 earlier. On busy systems, this bug wouldn't be noticed because something
859 else would have woken the daemon, and it would have reaped the completed
862 80. If a message was submitted locally by a user whose login name contained one
863 or more spaces (ugh!), the spool file that Exim wrote was not re-readable.
864 It caused a spool format error. I have fixed the spool reading code. A
865 related problem was that the "from" clause in the Received: line became
866 illegal because of the space(s). It is now covered by ${quote_local_part.
868 81. Included the latest eximstats from Steve (adds average sizes to HTML Top
871 82. Updated OS/Makefile-AIX as per message from Mike Meredith.
873 83. Patch from Sieve maintainer to fix unterminated string problem in
876 84. Some minor changes to the Linux configuration files to help with other
877 OS variants using glibc.
879 85. One more patch for Sieve to update vacation handling to latest spec.
882 ----------------------------------------------------
883 See the note above about the 4.44 and 4.50 releases.
884 ----------------------------------------------------
890 1. Change 4.43/35 introduced a bug that caused file counts to be
891 incorrectly computed when quota_filecount was set in an appendfile
894 2. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
895 bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
898 3. Give more explanation in the error message when the command for a transport
899 filter fails to execute.
901 4. There are several places where Exim runs a non-Exim command in a
902 subprocess. The SIGUSR1 signal should be disabled for these processes. This
903 was being done only for the command run by the queryprogram router. It is
904 now done for all such subprocesses. The other cases are: ${run, transport
905 filters, and the commands run by the lmtp and pipe transports.
907 5. Some older OS have a limit of 256 on the maximum number of file
908 descriptors. Exim was using setrlimit() to set 1000 as a large value
909 unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
910 systems. I've change it so that if it can't get 1000, it tries for 256.
912 6. "control=submission" was allowed, but had no effect, in a DATA ACL. This
913 was an oversight, and furthermore, ever since the addition of extra
914 controls (e.g. 4.43/32), the checks on when to allow different forms of
915 "control" were broken. There should now be diagnostics for all cases when a
916 control that does not make sense is encountered.
918 7. $recipients is now available in the predata ACL (oversight).
920 8. Tidy the search cache before the fork to do a delivery from a message
921 received from the command line. Otherwise the child will trigger a lookup
922 failure and thereby defer the delivery if it tries to use (for example) a
923 cached ldap connection that the parent has called unbind on.
925 9. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
926 of $address_data from the recipient verification was clobbered by the
929 10. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
930 was its contents. (It was OK if the option was not defined at all.)
932 11. A "Completed" log line is now written for messages that are removed from
933 the spool by the -Mrm option.
935 12. $host_address is now set to the target address during the checking of
938 13. When checking ignore_target_hosts for an ipliteral router, no host name was
939 being passed; this would have caused $sender_host_name to have been used if
940 matching the list had actually called for a host name (not very likely,
941 since this list is usually IP addresses). A host name is now passed as
944 14. Changed the calls that set up the SIGCHLD handler in the daemon to use the
945 code that specifies a non-restarting handler (typically sigaction() in
946 modern systems) in an attempt to fix a rare and obscure crash bug.
948 15. Narrowed the window for a race in the daemon that could cause it to ignore
949 SIGCHLD signals. This is not a major problem, because they are used only to
950 wake it up if nothing else does.
952 16. A malformed maildirsize file could cause Exim to calculate negative values
953 for the mailbox size or file count. Odd effects could occur as a result.
954 The maildirsize information is now recalculated if the size or filecount
957 17. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
958 support for a long time. Removed HAVE_SYS_VFS_H.
960 18. Updated exipick to current release from John Jetmore.
962 19. Allow an empty sender to be matched against a lookup in an address list.
963 Previously the only cases considered were a regular expression, or an
966 20. Exim went into a mad DNS lookup loop when doing a callout where the
967 host was specified on the transport, if the DNS lookup yielded more than
970 21. The RFC2047 encoding function was originally intended for short strings
971 such as real names; it was not keeping to the 75-character limit for
972 encoded words that the RFC imposes. It now respects the limit, and
973 generates multiple encoded words if necessary. To be on the safe side, I
974 have increased the buffer size for the ${rfc2047: expansion operator from
977 22. Failure to deliver a bounce message always caused it to be frozen, even if
978 there was an errors_to setting on the router. The errors_to setting is now
981 23. If an IPv6 address is given for -bh or -bhc, it is now converted to the
982 canonical form (fully expanded) before being placed in
983 $sender_host_address.
985 24. Updated eximstats to version 1.33
987 25. Include certificate and key file names in error message when GnuTLS fails
988 to set them up, because the GnuTLS error message doesn't include the name
989 of the failing file when there is a problem reading it.
991 26. Expand error message when OpenSSL has problems setting up cert/key files.
994 27. Reset the locale to "C" after calling embedded Perl, in case it was changed
995 (this can affect the format of dates).
997 28. exim_tidydb, when checking for the continued existence of a message for
998 which it has found a message-specific retry record, was not finding
999 messages that were in split spool directories. Consequently, it was
1000 deleting retry records that should have stayed in existence.
1002 29. eximstats updated to version 1.35
1003 1.34 - allow eximstats to parse syslog lines as well as mainlog lines
1004 1.35 - bugfix such that pie charts by volume are generated correctly
1006 30. The SPA authentication driver was not abandoning authentication and moving
1007 on to the next authenticator when an expansion was forced to fail,
1008 contradicting the general specification for all authenticators. Instead it
1009 was generating a temporary error. It now behaves as specified.
1011 31. The default ordering of permitted cipher suites for GnuTLS was pessimal
1012 (the order specifies the preference for clients). The order is now AES256,
1013 AES128, 3DES, ARCFOUR128.
1015 31. Small patch to Sieve code - explicitly set From: when generating an
1018 32. Exim crashed if a remote delivery caused a very long error message to be
1019 recorded - for instance if somebody sent an entire SpamAssassin report back
1020 as a large number of 550 error lines. This bug was coincidentally fixed by
1021 increasing the size of one of Exim's internal buffers (big_buffer) that
1022 happened as part of the Exiscan merge. However, to be on the safe side, I
1023 have made the code more robust (and fixed the comments that describe what
1026 33. Some experimental protocols are using DNS PTR records for new purposes. The
1027 keys for these records are domain names, not reversed IP addresses. The
1028 dnsdb PTR lookup now tests whether its key is an IP address. If not, it
1029 leaves it alone. Component reversal etc. now happens only for IP addresses.
1032 34. The host_aton() function is supposed to be passed a string that is known
1033 to be a valid IP address. However, in the case of IPv6 addresses, it was
1034 not checking this. This is a hostage to fortune. Exim now panics and dies
1035 if the condition is not met. A case was found where this could be provoked
1036 from a dnsdb PTR lookup with an IPv6 address that had more than 8
1037 components; fortuitously, this particular loophole had already been fixed
1038 by change 4.50/55 or 4.44/33 above.
1040 If there are any other similar loopholes, the new check in host_aton()
1041 itself should stop them being exploited. The report I received stated that
1042 data on the command line could provoke the exploit when Exim was running as
1043 exim, but did not say which command line option was involved. All I could
1044 find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
1045 running as the user.
1048 35. There was a buffer overflow vulnerability in the SPA authentication code
1049 (which came originally from the Samba project). I have added a test to the
1050 spa_base64_to_bits() function which I hope fixes it.
1053 36. The daemon start-up calls getloadavg() while still root for those OS that
1054 need the first call to be done as root, but it missed one case: when
1055 deliver_queue_load_max is set with deliver_drop_privilege. This is
1056 necessary for the benefit of the queue runner, because there is no re-exec
1057 when deliver_drop_privilege is set.
1059 37. Caching of lookup data for "hosts =" ACL conditions, when a named host list
1060 was in use, was not putting the data itself into the right store pool;
1061 consequently, it could be overwritten for a subsequent message in the same
1062 SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
1065 38. Sometimes the final signoff response after QUIT could fail to get
1066 transmitted in the non-TLS case. Testing !tls_active instead of tls_active
1067 < 0 before doing a fflush(). This bug looks as though it goes back to the
1068 introduction of TLS in release 3.20, but "sometimes" must have been rare
1069 because the tests only now provoked it.
1075 1. Fixed a longstanding but relatively impotent bug: a long time ago, before
1076 PIPELINING, the function smtp_write_command() used to return TRUE or FALSE.
1077 Now it returns an integer. A number of calls were still expecting a T/F
1078 return. Fortuitously, in all cases, the tests worked in OK situations,
1079 which is the norm. However, things would have gone wrong on any write
1080 failures on the smtp file descriptor. This function is used when sending
1081 messages over SMTP and also when doing verify callouts.
1083 2. When Exim is called to do synchronous delivery of a locally submitted
1084 message (the -odf or -odi options), it no longer closes stderr before doing
1087 3. Implemented the mua_wrapper option.
1089 4. Implemented mx_fail_domains and srv_fail_domains for the dnslookup router.
1091 5. Implemented the functions header_remove(), header_testname(),
1092 header_add_at_position(), and receive_remove_recipient(), and exported them
1095 6. If an ACL "warn" statement specified the addition of headers, Exim already
1096 inserted X-ACL-Warn: at the start if there was no header name. However, it
1097 was not making this test for the second and subsequent header lines if
1098 there were newlines in the string. This meant that an invalid header could
1099 be inserted if Exim was badly configured.
1101 7. Allow an ACL "warn" statement to add header lines at the start or after all
1102 the Received: headers, as well as at the end.
1104 8. Added the rcpt_4xx retry error code.
1106 9. Added postmaster_mailfrom=xxx to callout verification option.
1108 10. Added mailfrom=xxxx to the callout verification option, for verify=
1111 11. ${substr_1_:xxxx} and ${substr__3:xxxx} are now diagnosed as syntax errors
1112 (they previously behaved as ${substr_1_0:xxxx} and ${substr:_0_3:xxxx}).
1114 12. Inserted some casts to stop certain compilers warning when using pointer
1115 differences as field lengths or precisions in printf-type calls (mostly
1116 affecting debugging statements).
1118 13. Added optional readline() support for -be (dynamically loaded).
1120 14. Obscure bug fix: if a message error (e.g. 4xx to MAIL) happened within the
1121 same clock tick as a message's arrival, so that its received time was the
1122 same as the "first fail" time on the retry record, and that message
1123 remained on the queue past the ultimate address timeout, every queue runner
1124 would try a delivery (because it was past the ultimate address timeout) but
1125 after another failure, the ultimate address timeout, which should have then
1126 bounced the address, did not kick in. This was a "< instead of <=" error;
1127 in most cases the first failure would have been in the next clock tick
1128 after the received time, and all would be well.
1130 15. The special items beginning with @ in domain lists (e.g. @mx_any) were not
1131 being recognized when the domain list was tested by the match_domain
1132 condition in an expansion string.
1134 16. Added the ${str2b64: operator.
1136 17. Exim was always calling setrlimit() to set a large limit for the number of
1137 processes, without checking whether the existing limit was already
1138 adequate. (It did check for the limit on file descriptors.) Furthermore,
1139 errors from getrlimit() and setrlimit() were being ignored. Now they are
1140 logged to the main and panic logs, but Exim does carry on, to try to do its
1141 job under whatever limits there are.
1143 18. Imported PCRE 5.0.
1145 19. Trivial typo in log message " temporarily refused connection" (the leading
1148 20. If the log selector return_path_on_delivery was set and an address was
1149 redirected to /dev/null, the delivery process crashed because it assumed
1150 that a return path would always be set for a "successful" delivery. In this
1151 case, the whole delivery is bypassed as an optimization, and therefore no
1154 21. Internal re-arrangement: the function for sending a challenge and reading
1155 a response while authentication was assuming a zero-terminated challenge
1156 string. It's now changed to take a pointer and a length, to allow for
1157 binary data in such strings.
1159 22. Added the cyrus_sasl authenticator (code supplied by MBM).
1161 23. Exim was not respecting finduser_retries when seeking the login of the
1162 uid under which it was called; it was always trying 10 times. (The default
1163 setting of finduser_retries is zero.) Also, it was sleeping after the final
1164 failure, which is pointless.
1166 24. Implemented tls_on_connect_ports.
1168 25. Implemented acl_smtp_predata.
1170 26. If the domain in control=submission is set empty, Exim assumes that the
1171 authenticated id is a complete email address when it generates From: or
1172 Sender: header lines.
1174 27. Added "#define SOCKLEN_T int" to OS/os.h-SCO and OS/os.h-SCO_SV. Also added
1175 definitions to OS/Makefile-SCO and OS/Makefile-SCO_SV that put basename,
1176 chown and chgrp in /bin and hostname in /usr/bin.
1178 28. Exim was keeping the "process log" file open after each use, just as it
1179 does for the main log. This opens the possibility of it remaining open for
1180 long periods when the USR1 signal hits a daemon. Occasional processlog
1181 errors were reported, that could have been caused by this. Anyway, it seems
1182 much more sensible not to leave this file open at all, so that is what now
1185 29. The long-running daemon process does not normally write to the log once it
1186 has entered its main loop, and it closes the log before doing so. This is
1187 so that log files can straightforwardly be renamed and moved. However,
1188 there are a couple of unusual error situations where the daemon does write
1189 log entries, and I had neglected to close the log afterwards.
1191 30. The text of an SMTP error response that was received during a remote
1192 delivery was being truncated at 512 bytes. This is too short for some of
1193 the long messages that one sometimes sees. I've increased the limit to
1196 31. It is now possible to make retry rules that apply only when a message has a
1197 specific sender, in particular, an empty sender.
1199 32. Added "control = enforce_sync" and "control = no_enforce_sync". This makes
1200 it possible to be selective about when SMTP synchronization is enforced.
1202 33. Added "control = caseful_local_part" and "control = "caselower_local_part".
1204 32. Implemented hosts_connection_nolog.
1206 33. Added an ACL for QUIT.
1208 34. Setting "delay_warning=" to disable warnings was not working; it gave a
1211 35. Added mailbox_size and mailbox_filecount to appendfile.
1213 36. Added control = no_multiline_responses to ACLs.
1215 37. There was a bug in the logic of the code that waits for the clock to tick
1216 in the case where the clock went backwards by a substantial amount such
1217 that the microsecond fraction of "now" was more than the microsecond
1218 fraction of "then" (but the whole seconds number was less).
1220 38. Added support for the libradius Radius client library this is found on
1221 FreeBSD (previously only the radiusclient library was supported).
1227 1. When certain lookups returned multiple values in the form name=value, the
1228 quoting of the values was not always being done properly. Specifically:
1229 (a) If the value started with a double quote, but contained no whitespace,
1231 (b) If the value contained whitespace other than a space character (i.e.
1232 tabs or newlines or carriage returns) it was not quoted.
1233 This fix has been applied to the mysql and pgsql lookups by writing a
1234 separate quoting function and calling it from the lookup code. The fix
1235 should probably also be applied to nisplus, ibase and oracle lookups, but
1236 since I cannot test any of those, I have not disturbed their existing code.
1238 2. A hit in the callout cache for a specific address caused a log line with no
1239 reason for rejecting RCPT. Now it says "Previous (cached) callout
1240 verification failure".
1242 3. There was an off-by-one bug in the queryprogram router. An over-long
1243 return line was truncated at 256 instead of 255 characters, thereby
1244 overflowing its buffer with the terminating zero. As well as fixing this, I
1245 have increased the buffer size to 1024 (and made a note to document this).
1247 4. If an interrupt, such as the USR1 signal that is send by exiwhat, arrives
1248 when Exim is waiting for an SMTP response from a remote server, Exim
1249 restarts its select() call on the socket, thereby resetting its timeout.
1250 This is not a problem when such interrupts are rare. Somebody set up a cron
1251 job to run exiwhat every 2 minutes, which is less than the normal select()
1252 timeout (5 or 10 minutes). This meant that the select() timeout never
1253 kicked in because it was always reset. I have fixed this by comparing the
1254 time when an interrupt arrives with the time at the start of the first call
1255 to select(). If more time than the timeout has elapsed, the interrupt is
1256 treated as a timeout.
1258 5. Some internal re-factoring in preparation for the addition of Sieve
1259 extensions (by MH). In particular, the "personal" test is moved to a
1260 separate function, and given an option for scanning Cc: and Bcc: (which is
1261 not set for Exim filters).
1263 6. When Exim created an email address using the login of the caller as the
1264 local part (e.g. when creating a From: or Sender: header line), it was not
1265 quoting the local part when it contained special characters such as @.
1267 7. Installed new OpenBSD configuration files.
1269 8. Reworded some messages for syntax errors in "and" and "or" conditions to
1270 try to make them clearer.
1272 9. Callout options, other than the timeout value, were being ignored when
1273 verifying sender addresses in header lines. For example, when using
1275 verify = header_sender/callout=no_cache
1277 the cache was (incorrectly) being used.
1279 10. Added a missing instance of ${EXE} to the exim_install script; this affects
1280 only the Cygwin environment.
1282 11. When return_path_on_delivery was set as a log selector, if different remote
1283 addresses in the same message used different return paths and parallel
1284 remote delivery occurred, the wrong values would sometimes be logged.
1285 (Whenever a remote delivery process finished, the return path value from
1286 the most recently started remote delivery process was logged.)
1288 12. RFC 3848 specifies standard names for the "with" phrase in Received: header
1289 lines when AUTH and/or TLS are in use. This is the "received protocol"
1290 field. Exim used to use "asmtp" for authenticated SMTP, without any
1291 indication (in the protocol name) for TLS use. Now it follows the RFC and
1292 uses "esmtpa" if the connection is authenticated, "esmtps" if it is
1293 encrypted, and "esmtpsa" if it is both encrypted and authenticated. These
1294 names appear in log lines as well as in Received: header lines.
1296 13. Installed MH's patches for Sieve to add the "copy" and "vacation"
1297 extensions, and comparison tests, and to fix some bugs.
1299 14. Changes to the "personal" filter test:
1301 (1) The test was buggy in that it was just doing the equivalent of
1302 "contains" tests on header lines. For example, if a user's address was
1303 anne@some.where, the "personal" test would incorrectly be true for
1305 To: susanne@some.where
1307 This test is now done by extracting each address from the header in turn,
1308 and checking the entire address. Other tests that are part of "personal"
1309 are now done using regular expressions (for example, to check local parts
1310 of addresses in From: header lines).
1312 (2) The list of non-personal local parts in From: addresses has been
1313 extended to include "listserv", "majordomo", "*-request", and "owner-*",
1314 taken from the Sieve specification recommendations.
1316 (3) If the message contains any header line starting with "List-" it is
1317 treated as non-personal.
1319 (4) The test for "circular" in the Subject: header line has been removed
1320 because it now seems ill-conceived.
1322 15. Minor typos in src/EDITME comments corrected.
1324 16. Installed latest exipick from John Jetmore.
1326 17. If headers_add on a router specified a text string that was too long for
1327 string_sprintf() - that is, longer than 8192 bytes - Exim panicked. The use
1328 of string_sprintf() is now avoided.
1330 18. $message_body_size was not set (it was always zero) when running the DATA
1331 ACL and the local_scan() function.
1333 19. For the "mail" command in an Exim filter, no default was being set for
1334 the once_repeat time, causing a random time value to be used if "once" was
1335 specified. (If the value happened to be <= 0, no repeat happened.) The
1336 default is now 0s, meaning "never repeat". The "vacation" command was OK
1337 (its default is 7d). It's somewhat surprising nobody ever noticed this bug
1338 (I found it when inspecting the code).
1340 20. There is now an overall timeout for performing a callout verification. It
1341 defaults to 4 times the callout timeout, which applies to individual SMTP
1342 commands during the callout. The overall timeout applies when there is more
1343 than one host that can be tried. The timeout is checked before trying the
1344 next host. This prevents very long delays if there are a large number of
1345 hosts and all are timing out (e.g. when the network connections are timing
1346 out). The value of the overall timeout can be changed by specifying an
1347 additional sub-option for "callout", called "maxwait". For example:
1349 verify = sender/callout=5s,maxwait=20s
1351 21. Add O_APPEND to the open() call for maildirsize files (Exim already seeks
1352 to the end before writing, but this should make it even safer).
1354 22. Exim was forgetting that it had advertised PIPELINING for the second and
1355 subsequent messages on an SMTP connection. It was also not resetting its
1356 memory on STARTTLS and an internal HELO.
1358 23. When Exim logs an SMTP synchronization error within a session, it now
1359 records whether PIPELINING has been advertised or not.
1361 24. Added 3 instances of "(long int)" casts to time_t variables that were being
1362 formatted using %ld, because on OpenBSD (and perhaps others), time_t is int
1363 rather than long int.
1365 25. Installed the latest Cygwin configuration files from the Cygwin maintainer.
1367 26. Added the never_mail option to autoreply.
1373 1. A reorganization of the code in order to implement 4.40/8 caused a daemon
1374 crash if the getsockname() call failed; this can happen if a connection is
1375 closed very soon after it is established. The problem was simply in the
1376 order in which certain operations were done, causing Exim to try to write
1377 to the SMTP stream before it had set up the file descriptor. The bug has
1378 been fixed by making things happen in the correct order.
1384 1. If "drop" was used in a DATA ACL, the SMTP output buffer was not flushed
1385 before the connection was closed, thus losing the rejection response.
1387 2. Commented out the definition of SOCKLEN_T in os.h-SunOS5. It is needed for
1388 some early Solaris releases, but causes trouble in current releases where
1389 socklen_t is defined.
1391 3. When std{in,out,err} are closed, re-open them to /dev/null so that they
1394 4. Minor refactoring of os.c-Linux to avoid compiler warning when IPv6 is not
1397 5. Refactoring in expand.c to improve memory usage. Pre-allocate a block so
1398 that releasing the top of it at the end releases what was used for sub-
1399 expansions (unless the block got too big). However, discard this block if
1400 the first thing is a variable or header, so that we can use its block when
1401 it is dynamic (useful for very large $message_headers, for example).
1403 6. Lookups now cache *every* query, not just the most recent. A new, separate
1404 store pool is used for this. It can be recovered when all lookup caches are
1405 flushed. Lookups now release memory at the end of their result strings.
1406 This has involved some general refactoring of the lookup sources.
1408 7. Some code has been added to the store_xxx() functions to reduce the amount
1409 of flapping under certain conditions.
1411 8. log_incoming_interface used to affect only the <= reception log lines. Now
1412 it causes the local interface and port to be added to several more SMTP log
1413 lines, for example "SMTP connection from", and rejection lines.
1415 9. The Sieve author supplied some patches for the doc/README.SIEVE file.
1417 10. Added a conditional definition of _BSD_SOCKLEN_T to os.h-Darwin.
1419 11. If $host_data was set by virtue of a hosts lookup in an ACL, its value
1420 could be overwritten at the end of the current message (or the start of a
1421 new message if it was set in a HELO ACL). The value is now preserved for
1422 the duration of the SMTP connection.
1424 12. If a transport had a headers_rewrite setting, and a matching header line
1425 contained an unqualified address, that address was qualified, even if it
1426 did not match any rewriting rules. The underlying bug was that the values
1427 of the flags that permit the existence of unqualified sender and recipient
1428 addresses in header lines (set by {sender,recipient}_unqualified_hosts for
1429 non-local messages, and by -bnq for local messages) were not being
1430 preserved with the message after it was received.
1432 13. When Exim was logging an SMTP synchronization error, it could sometimes log
1433 "next input=" as part of the text comprising the host identity instead of
1434 the correct text. The code was using the same buffer for two different
1435 strings. However, depending on which order the printing function evaluated
1436 its arguments, the bug did not always show up. Under Linux, for example, my
1437 test suite worked just fine.
1439 14. Exigrep contained a use of Perl's "our" scoping after change 4.31/70. This
1440 doesn't work with some older versions of Perl. It has been changed to "my",
1441 which in any case is probably the better facility to use.
1443 15. A really picky compiler found some instances of statements for creating
1444 error messages that either had too many or two few arguments for the format
1447 16. The size of the buffer for calls to the DNS resolver has been increased
1448 from 1024 to 2048. A larger buffer is needed when performing PTR lookups
1449 for addresses that have a lot of PTR records. This alleviates a problem; it
1450 does not fully solve it.
1452 17. A dnsdb lookup for PTR records that receives more data than will fit in the
1453 buffer now truncates the list and logs the incident, which is the same
1454 action as happens when Exim is looking up a host name and its aliases.
1455 Previously in this situation something unpredictable would happen;
1456 sometimes it was "internal error: store_reset failed".
1458 18. If a server dropped the connection unexpectedly when an Exim client was
1459 using GnuTLS and trying to read a response, the client delivery process
1460 crashed while trying to generate an error log message.
1462 19. If a "warn" verb in an ACL added multiple headers to a message in a single
1463 string, for example:
1465 warn message = H1: something\nH2: something
1467 the text was added as a single header line from Exim's point of view
1468 though it ended up OK in the delivered message. However, searching for the
1469 second and subsequent header lines using $h_h2: did not work. This has been
1470 fixed. Similarly, if a system filter added multiple headers in this way,
1471 the routers could not see them.
1473 20. Expanded the error message when iplsearch is called with an invalid key to
1474 suggest using net-iplsearch in a host list.
1476 21. When running tests using -bh, any delays imposed by "delay" modifiers in
1477 ACLs are no longer actually imposed (and a message to that effect is
1480 22. If a "gecos" field in a passwd entry contained escaped characters, in
1481 particular, if it contained a \" sequence, Exim got it wrong when building
1482 a From: or a Sender: header from that name. A second bug also caused
1483 incorrect handling when an unquoted " was present following a character
1484 that needed quoting.
1486 23. "{crypt}" as a password encryption mechanism for a "crypteq" expansion item
1487 was not being matched caselessly.
1489 24. Arranged for all hyphens in the exim.8 source to be escaped with
1492 25. Change 16 of 4.32, which reversed 71 or 4.31 didn't quite do the job
1493 properly. Recipient callout cache records were still being keyed to include
1494 the sender, even when use_sender was set false. This led to far more
1495 callouts that were necessary. The sender is no longer included in the key
1496 when use_sender is false.
1498 26. Added "control = submission" modifier to ACLs.
1500 27. Added the ${base62d: operator to decode base 62 numbers.
1502 28. dnsdb lookups can now access SRV records.
1504 29. CONFIGURE_OWNER can be set at build time to define an alternative owner for
1505 the configuration file.
1507 30. The debug message "delivering xxxxxx-xxxxxx-xx" is now output in verbose
1508 (-v) mode. This makes the output for a verbose queue run more intelligible.
1510 31. Added a use_postmaster feature to recipient callouts.
1512 32. Added the $body_zerocount variable, containing the number of binary zero
1513 bytes in the message body.
1515 33. The time of last modification of the "new" subdirectory is now used as the
1516 "mailbox time last read" when there is a quota error for a maildir
1519 34. Added string comparison operators lt, lti, le, lei, gt, gti, ge, gei.
1521 35. Added +ignore_unknown as a special item in host lists.
1523 36. Code for decoding IPv6 addresses in host lists is now included, even if
1524 IPv6 support is not being compiled. This fixes a bug in which an IPv6
1525 address was recognized as an IP address, but was then not correctly decoded
1526 into binary, causing unexpected and incorrect effects when compared with
1533 1. Very minor rewording of debugging text in manualroute to say "list of
1534 hosts" instead of "hostlist".
1536 2. If verify=header_syntax was set, and a header line with an unqualified
1537 address (no domain) and a large number of spaces between the end of the
1538 name and the colon was received, the reception process suffered a buffer
1539 overflow, and (when I tested it) crashed. This was caused by some obsolete
1540 code that should have been removed. The fix is to remove it!
1542 3. When running in the test harness, delay a bit after writing a bounce
1543 message to get a bit more predictability in the log output.
1545 4. Added a call to search_tidyup() just before forking a reception process. In
1546 theory, someone could use a lookup in the expansion of smtp_accept_max_
1547 per_host which, without the tidyup, could leave open a database connection.
1549 5. Added the variables $recipient_data and $sender_data which get set from a
1550 lookup success in an ACL "recipients" or "senders" condition, or a router
1551 "senders" option, similar to $domain_data and $local_part_data.
1553 6. Moved the writing of debug_print from before to after the "senders" test
1556 7. Change 4.31/66 (moving the time when the Received: is generated) caused
1557 problems for message scanning, either using a data ACL, or using
1558 local_scan() because the Received: header was not generated till after they
1559 were called (in order to set the time as the time of reception completion).
1560 I have revised the way this works. The header is now generated after the
1561 body is received, but before the ACL or local_scan() are called. After they
1562 are run, the timestamp in the header is updated.
1568 1. Change 4.24/6 introduced a bug because the SIGALRM handler was disabled
1569 before starting a queue runner without re-exec. This happened only when
1570 deliver_drop_privilege was set or when the Exim user was set to root. The
1571 effect of the bug was that timeouts during subsequent deliveries caused
1572 crashes instead of being properly handled. The handler is now left at its
1573 default (and expected) setting.
1575 2. The other case in which a daemon avoids a re-exec is to deliver an incoming
1576 message, again when deliver_drop_privilege is set or Exim is run as root.
1577 The bug described in (1) was not present in this case, but the tidying up
1578 of the other signals was missing. I have made the two cases consistent.
1580 3. The ignore_target_hosts setting on a manualroute router was being ignored
1581 for hosts that were looked up using the /MX notation.
1583 4. Added /ignore=<ip list> feature to @mx_any, @mx_primary, and @mx_secondary
1586 5. Change 4.31/55 was buggy, and broke when there was a rewriting rule that
1587 operated on the sender address. After changing the $sender_address to <>
1588 for the sender address verify, Exim was re-instated it as the original
1589 (before rewriting) address, but remembering that it had rewritten it, so it
1590 wasn't rewriting it again. This bug also had the effect of breaking the
1591 sender address verification caching when the sender address was rewritten.
1593 6. The ignore_target_hosts option was being ignored by the ipliteral router.
1594 This has been changed so that if the ip literal address matches
1595 ignore_target_hosts, the router declines.
1597 7. Added expansion conditions match_domain, match_address, and match_local_
1598 part (NOT match_host).
1600 8. The placeholder for the Received: header didn't have a length field set.
1602 9. Added code to Exim itself and to exim_lock to test for a specific race
1603 condition that could lead to file corruption when using MBX delivery. The
1604 issue is with the lockfile that is created in /tmp. If this file is removed
1605 after a process has opened it but before that process has acquired a lock,
1606 there is the potential for a second process to recreate the file and also
1607 acquire a lock. This could lead to two Exim processes writing to the file
1608 at the same time. The added code performs the same test as UW imapd; it
1609 checks after acquiring the lock that its file descriptor still refers to
1610 the same named file.
1612 10. The buffer for building added header lines was of fixed size, 8192 bytes.
1613 It is now parameterized by HEADER_ADD_BUFFER_SIZE and this can be adjusted
1616 11. Added the smtp_active_hostname option. If used, this will typically be made
1617 to depend on the incoming interface address. Because $interface_address is
1618 not set up until the daemon has forked a reception process, error responses
1619 that can happen earlier (such as "too many connections") no longer contain
1622 12. If an expansion in a condition on a "warn" statement fails because a lookup
1623 defers, the "warn" statement is abandoned, and the next ACL statement is
1624 processed. Previously this caused the whole ACL to be aborted.
1626 13. Added the iplsearch lookup type.
1628 14. Added ident_timeout as a log selector.
1630 15. Added tls_certificate_verified as a log selector.
1632 16. Added a global option tls_require_ciphers (compare the smtp transport
1633 option of the same name). This controls incoming TLS connections.
1635 17. I finally figured out how to make tls_require_ciphers do a similar thing
1636 in GNUtls to what it does in OpenSSL, that is, set up an appropriate list
1637 before starting the TLS session.
1639 18. Tabs are now shown as \t in -bP output.
1641 19. If the log selector return_path_on_delivery was set, Exim crashed when
1642 bouncing a message because it had too many Received: header lines.
1644 20. If two routers both had headers_remove settings, and the first one included
1645 a superfluous trailing colon, the final name in the first list and the
1646 first name in the second list were incorrectly joined into one item (with a
1647 colon in the middle).
1653 1. Added -C and -D options to the exinext utility, mainly to make it easier
1654 to include in the automated testing, but these could be helpful when
1655 multiple configurations are in use.
1657 2. The exinext utility was not formatting the output nicely when there was
1658 an alternate port involved in the retry record key, nor when there was a
1659 message id as well (for retries that were specific to a specific message
1660 and a specific host). It was also confused by IPv6 addresses, because of
1661 the additional colons they contain. I have fixed the IPv4 problem, and
1662 patched it up to do a reasonable job for IPv6.
1664 3. When there is an error after a MAIL, RCPT, or DATA SMTP command during
1665 delivery, the log line now contains "pipelined" if PIPELINING was used.
1667 4. An SMTP transport process used to panic and die if the bind() call to set
1668 an explicit outgoing interface failed. This has been changed; it is now
1669 treated in the same way as a connect() failure.
1671 5. A reference to $sender_host_name in the part of a conditional expansion
1672 that was being skipped was still causing a DNS lookup. This no longer
1675 6. The def: expansion condition was not recognizing references to header lines
1676 that used bh_ and bheader_.
1678 7. Added the _cache feature to named lists.
1680 8. The code for checking quota_filecount in the appendfile transport was
1681 allowing one more file than it should have been.
1683 9. For compatibility with Sendmail, the command line option
1691 and sets the incoming protocol and host name (for trusted callers). The
1692 host name and its colon can be omitted when only the protocol is to be set.
1693 Note the Exim already has two private options, -pd and -ps, that refer to
1694 embedded Perl. It is therefore impossible to set a protocol value of "d" or
1695 "s", but I don't think that's a major issue.
1697 10. A number of refactoring changes to the code, none of which should affect
1700 (a) The number of logging options was getting close to filling up the
1701 32-bit word that was used as a bit map. I have split them into two classes:
1702 those that are passed in the argument to log_write(), and those that are
1703 only ever tested independently outside of that function. These are now in
1704 separate 32-bit words, so there is plenty of room for expansion again.
1705 There is no change in the user interface or the logging behaviour.
1707 (b) When building, for example, log lines, the code previously used a
1708 macro that called string_cat() twice, in order to add two strings. This is
1709 not really sufficiently general. Furthermore, there was one instance where
1710 it was actually wrong because one of the argument was used twice, and in
1711 one call a function was used. (As it happened, calling the function twice
1712 did not affect the overall behaviour.) The macro has been replaced by a
1713 function that can join an arbitrary number of extra strings onto a growing
1716 (c) The code for expansion conditions now uses a table and a binary chop
1717 instead of a serial search (which was left over from when there were very
1718 few conditions). Also, it now recognizes conditions like "pam" even when
1719 the relevant support is not compiled in: a suitably worded error message is
1720 given if an attempt is made to use such a condition.
1722 11. Added ${time_interval:xxxxx}.
1724 12. A bug was causing one of the ddress fields not to be passed back correctly
1725 from remote delivery subprocesses. The field in question was not being
1726 subsequently used, so this caused to problems in practice.
1728 13. Added new log selectors queue_time and deliver_time.
1730 14. Might have fixed a bug in maildirsizefile handling that threw up
1731 "unexpected character" debug warnings, and recalculated the data
1732 unnecessarily. In any case, I expanded the warning message to give more
1735 15. Added the message "Restricted characters in address" to the statements in
1736 the default ACL that block characters like @ and % in local parts.
1738 16. Change 71 for release 4.31 proved to be much less benign that I imagined.
1739 Three changes have been made:
1741 (a) There was a serious bug; a negative response to MAIL caused the whole
1742 recipient domain to be cached as invalid, thereby blocking all messages
1743 to all local parts at the same domain, from all senders. This bug has
1744 been fixed. The domain is no longer cached after a negative response to
1745 MAIL if the sender used is not empty.
1747 (b) The default behaviour of using MAIL FROM:<> for recipient callouts has
1750 (c) A new callout option, "use_sender" has been added for people who want
1751 the modified behaviour.
1757 1. Removed "EXTRALIBS=-lwrap" from OS/Makefile-Unixware7 on the advice of
1760 2. Removed "LIBS = -lresolv" from OS/Makefile-Darwin as it is not needed, and
1761 indeed breaks things for older releases.
1763 3. Added additional logging to the case where there is a problem reading data
1764 from a filter that is running in a subprocess using a pipe, in order to
1765 try to track down a specific problem.
1767 4. Testing facility fudge: when running in the test harness and attempting
1768 to connect to 10.x.x.x (expecting a connection timeout) I'm now sometimes
1769 getting "No route to host". Convert this to a timeout.
1771 5. Define ICONV_ARG2_TYPE as "char **" for Unixware7 to avoid compiler
1774 6. Some OS don't have socklen_t but use size_t instead. This affects the
1775 fifth argument of getsockopt() amongst other things. This is now
1776 configurable by a macro called SOCKLEN_T which defaults to socklen_t, but
1777 can be set for individual OS. I have set it for SunOS5, OSF1, and
1778 Unixware7. Current versions of SunOS5 (aka Solaris) do have socklen_t, but
1779 some earlier ones do not.
1781 7. Change 4.30/15 was not doing the test caselessly.
1783 8. The standard form for an IPv6 address literal was being rejected by address
1784 parsing in, for example, MAIL and RCPT commands. An example of this kind of
1785 address is [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
1786 this, as well as the form without the "IPv6" on the front (but only when
1787 address literals are enabled, of course).
1789 9. Added some casts to avoid compiler warnings in OS/os.c-Linux.
1791 10. Exim crashed if a message with an empty sender address specified by -f
1792 encountered a router with an errors_to setting. This could be provoked only
1793 by a command such as
1797 where an empty string was supplied; "<>" did not hit this bug.
1799 11. Installed PCRE release 4.5.
1801 12. If EHLO/HELO was rejected by an ACL, the value of $sender_helo_name
1802 remained set. It is now erased.
1804 13. exiqgrep wasn't working on MacOS X because it didn't correctly compute
1805 times from message ids (which are base 36 rather than the normal 62).
1807 14. "Expected" SMTP protocol errors that can arise when PIPELINING is in use
1808 were being counted as actual protocol errors, and logged if the log
1809 selector +smtp_protocol_error was set. One cannot be perfect in this test,
1810 but now, if PIPELINING has been advertised, RCPT following a rejected MAIL,
1811 and DATA following a set of rejected RCPTs do not count as protocol errors.
1812 In other words, Exim assumes they were pipelined, though this may not
1813 actually be the case. Of course, in all cases the client gets an
1814 appropriate error code.
1816 15. If a lookup fails in an ACL condition, a message about the failure may
1817 be available; it is used if testing the ACL cannot continue, because most
1818 such messages specify what the cause of the deferral is. However, some
1819 messages (e.g. "MYSQL: no data found") do not cause a defer. There was bug
1820 that caused an old message to be retained and used if a later statement
1821 caused a defer, replacing the real cause of the deferral.
1823 16. If an IP address had so many PTR records that the DNS lookup buffer
1824 was not large enough to hold them, Exim could crash while trying to process
1825 the truncated data. It now detects and logs this case.
1827 17. Further to 4.21/58, another change has been made: if (and only if) the
1828 first line of a message (the first header line) ends with CRLF, a bare LF
1829 in a subsequent header line has a space inserted after it, so as not to
1830 terminate the header.
1832 18. Refactoring: tidied an ugly bit of code in appendfile that copied data
1833 unnecessarily, used atoi() instead of strtol(), and didn't check the
1834 termination when getting file sizes from file names by regex.
1836 19. Completely re-implemented the support for maildirsize files, in the light
1837 of a number of problems with the previous contributed implementation
1838 (4.30/29). In particular:
1840 . If the quota is zero, the maildirsize file is maintained, but no quota is
1843 . If the maildir directory does not exist, it is created before any attempt
1844 to write a maildirsize file.
1846 . The quota value in the file is just a cache; if the quota is changed in
1847 the transport, the new value overrides.
1849 . A regular expression is available for excluding directories from the
1852 20. The autoreply transport checks the characters in options that define the
1853 message's headers; it allows continued headers, but it was checking with
1854 isspace() after an embedded newline instead of explicitly looking for a
1857 21. If all the "regular" hosts to which an address was routed had passed their
1858 expiry times, and had not reached their retry times, the address was
1859 bounced, even if fallback hosts were defined. Now Exim should go on to try
1862 22. Increased buffer sizes in the callout code from 1024 to 4096 to match the
1863 equivalent code in the SMTP transport. Some hosts send humungous responses
1864 to HELO/EHLO, more than 1024 it seems.
1866 23. Refactoring: code in filter.c used (void *) for "any old type" but this
1867 gives compiler warnings in some environments. I've now done it "properly",
1870 24. The replacement for inet_ntoa() that is used with gcc on IRIX systems
1871 (because of problems with the built-in one) was declared to return uschar *
1872 instead of char *, causing compiler failure.
1874 25. Fixed a file descriptor leak when processing alias/forward files.
1876 26. Fixed a minor format string issue in dbfn.c.
1878 27. Typo in exim.c: ("dmbnz" for "dbmnz").
1880 28. If a filter file refered to $h_xxx or $message_headers, and the headers
1881 contained RFC 2047 "words", Exim's memory could, under certain conditions,
1884 29. When a sender address is verified, it is cached, to save repeating the test
1885 when there is more than one recipient in a message. However, when the
1886 verification involves a callout, it is possible for different callout
1887 options to be set for different recipients. It is too complicated to keep
1888 track of this in the cache, so now Exim always runs a verification when a
1889 callout is required, relying on the callout cache for the optimization.
1890 The overhead is duplication of the address routing, but this should not be
1893 30. Fixed a bug in callout caching. If a RCPT command caused the sender address
1894 to be verified with callout=postmaster, and the main callout worked but the
1895 postmaster check failed, the verification correctly failed. However, if a
1896 subsequent RCPT command asked for sender verification *without* the
1897 postmaster check, incorrect caching caused this verification also to fail,
1900 31. Exim caches DNS lookup failures so as to avoid multiple timeouts; however,
1901 it was not caching the DNS options (qualify_single, search_parents) that
1902 were used when the lookup failed. A subsequent lookup with different
1903 options therefore always gave the same answer, though there were cases
1904 where it should not have. (Example: a "domains = !$mx_any" option on a
1905 dnslookup router: the "domains" option is always processed without any
1906 widening, but the router might have qualify_single set.) Now Exim uses the
1907 cached value only when the same options are set.
1909 32. Added John Jetmore's "exipick" utility to the distribution.
1911 33. GnuTLS: When an attempt to start a TLS session fails for any reason other
1912 than a timeout (e.g. a certificate is required, and is not provided), an
1913 Exim server now closes the connection immediately. Previously it waited for
1914 the client to close - but if the client is SSL, it seems that they each
1915 wait for each other, leading to a delay before one of them times out.
1917 34: GnuTLS: Updated the code to use the new GnuTLS 1.0.0 API. I have not
1918 maintained 0.8.x compatibility because I don't think many are using it, and
1919 it is clearly obsolete.
1921 35. Added TLS support for CRLs: a tls_crl global option and one for the smtp
1924 36. OpenSSL: $tls_certificate_verified was being set to 1 even if the
1925 client certificate was expired. A simple patch fixes this, though I don't
1926 understand the full logic of why the verify callback is called multiple
1929 37. OpenSSL: a patch from Robert Roselius: "Enable client-bug workaround.
1930 Versions of OpenSSL as of 0.9.6d include a 'CBC countermeasure' feature,
1931 which causes problems with some clients (such as the Certicom SSL Plus
1932 library used by Eudora). This option, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS,
1933 disables the coutermeasure allowing Eudora to connect."
1935 38. Exim was not checking that a write() to a log file succeeded. This could
1936 lead to Bad Things if a log got too big, in particular if it hit a file
1937 size limit. Exim now panics and dies if it cannot write to a log file, just
1938 as it does if it cannot open a log file.
1940 39. Modified OS/Makefile-Linux so that it now contains
1942 CFLAGS=-O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
1944 The two -D definitions ensure that Exim is compiled with large file
1945 support, which makes it possible to handle log files that are bigger than
1948 40. Fixed a subtle caching bug: if (in an ACL or a set of routers, for
1949 instance) a domain was checked against a named list that involved a lookup,
1950 causing $domain_data to be set, then another domain was checked against the
1951 same list, then the first domain was re-checked, the value of $domain_data
1952 after the final check could be wrong. In particular, if the second check
1953 failed, it could be set empty. This bug probably also applied to
1956 41. The strip_trailing_dot option was not being applied to the address given
1957 with the -f command-line option.
1959 42. The code for reading a message's header from the spool was incrementing
1960 $received_count, but never initializing it. This meant that the value was
1961 incorrect (doubled) while delivering a message in the same process in which
1962 it was received. In the most common configuration of Exim, this never
1963 happens - a fresh exec is done - but it can happen when
1964 deliver_drop_privilege is set.
1966 43. When Exim logs an SMTP synchronization error - client data sent too soon -
1967 it now includes up to 150 characters of the unexpected data in the log
1970 44. The exim_dbmbuild utility uses fixed size buffers for reading input lines
1971 and building data strings. The size of both of these buffers was 10 000
1972 bytes - far larger than anybody would *ever* want, thought I. Needless to
1973 say, somebody hit the limit. I have increased the maximum line length to
1974 20 000 and the maximum data length of concatenated lines to 100 000. I have
1975 also fixed two bugs, because there was no checking on these buffers. Tsk,
1976 tsk. Now exim_dbmbuild gives a message and exits with an error code if a
1977 buffer is too small.
1979 45. The exim_dbmbuild utility did not support quoted keys, as Exim does in
1980 lsearch lookups. Now it does.
1982 46. When parsing a route_list item in a manualroute router, a fixed-length
1983 buffer was used for the list of hosts. I made this 1024 bytes long,
1984 thinking that nobody would ever have a list of hosts that long. Wrong.
1985 Somebody had a whole pile of complicated expansion conditions, and the
1986 string was silently truncated, leading to an expansion error. It turns out
1987 that it is easier to change to an unlimited length (owing to other changes
1988 that have happened since this code was originally written) than to build
1989 structure for giving a limitation error. The length of the item that
1990 expands into the list of hosts is now unlimited.
1992 47. The lsearch lookup could not handle data where the length of text line was
1993 more than 4095 characters. Such lines were truncated, leading to shortened
1994 data being returned. It should now handle lines of any length.
1996 48. Minor wording revision: "cannot test xxx in yyy ACL" becomes "cannot test
1997 xxx condition in yyy ACL" (e.g. "cannot test domains condition in DATA
2000 49. Cosmetic tidy to scripts like exicyclog that are generated by globally
2001 replacing strings such as BIN_DIRECTORY in a source file: the replacement
2002 no longer happens in comment lines. A list of replacements is now placed
2003 at the head of all of the source files, except those whose only change is
2004 to replace PERL_COMMAND in the very first #! line.
2006 50. Replaced the slow insertion sort in queue.c, for sorting the list of
2007 messages on the queue, with a bottom-up merge sort, using code contributed
2008 by Michael Haardt. This should make operations like -bp somewhat faster on
2009 large queues. It won't affect queue runners, except when queue_run_in_order
2012 51. Installed eximstats 1.31 in the distribution.
2014 52. Added support for SRV lookups to the dnslookup router.
2016 53. If an ACL referred to $message_body or $message_body_end, the value was not
2017 reset for any messages that followed in the same SMTP session.
2019 54. The store-handling optimization for building very long strings was not
2020 differentiating between the different store pools. I don't think this
2021 actually made any difference in practice, but I've tidied it.
2023 55. While running the routers to verify a sender address, $sender_address
2024 was still set to the sender address. This is wrong, because when routing to
2025 send a bounce to the sender, it would be empty. Therefore, I have changed
2026 it so that, while verifying a sender address, $sender_address is set to <>.
2027 (There is no change to what happens when verifying a recipient address.)
2029 56. After finding MX (or SRV) records, Exim was doing a DNS lookup for the
2030 target A or AAAA records (if not already returned) without resetting the
2031 qualify_single or search_parents options of the DNS resolver. These are
2032 inappropriate in this case because the targets of MX and SRV records must
2033 be FQDNs. A broken DNS record could cause trouble if it happened to have a
2034 target that, when qualified, matched something in the local domain. These
2035 two options are now turned off when doing these lookups.
2037 57. It seems that at least some releases of Reiserfs (which does not have the
2038 concept of a fixed number of inodes) returns zero and not -1 for the
2039 number of available inodes. This interacted badly with check_spool_inodes,
2040 which assumed that -1 was the "no such thing" setting. What I have done is
2041 to check that the total number of inodes is greater than zero before doing
2042 the test of how many are available.
2044 58. When a "warn" ACL statement has a log_message modifier, the message is
2045 remembered, and not repeated. This is to avoid a lot of repetition when a
2046 message has many recipients that cause the same warning to be written.
2047 Howewer, Exim was preserving the list of already written lines for an
2048 entire SMTP session, which doesn't seem right. The memory is now reset if a
2049 new message is started.
2051 59. The "rewrite" debugging flag was not showing the result of rewriting in the
2052 debugging output unless log_rewrite was also set.
2054 60. Avoid a compiler warning on 64-bit systems in dsearch.c by avoiding the use
2055 of (int)(handle) when we know that handle contains (void *)(-1).
2057 61. The Exim daemon panic-logs an error return when it closes the incoming
2058 connection. However "connection reset by peer" seems to be common, and
2059 isn't really an error worthy of noting specially, so that particular error
2062 62. When Exim is trying to find all the local interfaces, it used to panic and
2063 die if the ioctl to get the interface flags failed. However, it seems that
2064 on at least one OS (Solaris 9) it is possible to have an interface that is
2065 included in the list of interfaces, but for which you get a failure error
2066 for this call. This happens when the interface is not "plumbed" into a
2067 protocol (i.e. neither IPv4 nor IPv6). I've changed the code so that a
2068 failure of the "get flags" call assumes that the interface is down.
2070 63. Added a ${eval10: operator, which assumes all numbers are decimal. This
2071 makes life easier for people who are doing arithmetic on fields extracted
2072 from dates, where you often get leading zeros that should not be
2073 interpreted as octal.
2075 64. Added qualify_domain to the redirect router, to override the global
2078 65. If a pathologically long header line contained very many addresses (the
2079 report of this problem mentioned 10 000) and each of them was rewritten,
2080 Exim could use up a very large amount of memory. (It kept on making new
2081 copies of the header line as it rewrote, and never released the old ones.)
2082 At the expense of a bit more processing, the header rewriting function has
2083 been changed so that it no longer eats memory in this way.
2085 66. The generation of the Received: header has been moved from the time that a
2086 message starts to be received, to the time that it finishes. The timestamp
2087 in the Received: header should now be very close to that of the <= log
2088 line. There are two side-effects of this change:
2090 (a) If a message is rejected by a DATA or non-SMTP ACL or local_scan(), the
2091 logged header lines no longer include the local Received: line, because
2092 it has not yet been created. The same applies to a copy of the message
2093 that is returned to a non-SMTP sender when a message is rejected.
2095 (b) When a filter file is tested using -bf, no additional Received: header
2096 is added to the test message. After some thought, I decided that this
2099 This change does not affect the value of $received_for. It is still set
2100 after address rewriting, but before local_scan() is called.
2102 67. Installed the latest Cygwin-specific files from the Cygwin maintainer.
2104 68. GnuTLS: If an empty file is specified for tls_verify_certificates, GnuTLS
2105 gave an unhelpful panic error message, and a defer error. I have managed to
2106 change this behaviour so that it now rejects any supplied certificate,
2107 which seems right, as the list of acceptable certificates is empty.
2109 69. OpenSSL: If an empty file is specified for tls_verify_certificates, OpenSSL
2110 gave an unhelpful defer error. I have not managed to make this reject any
2111 supplied certificates, but the error message it gives is "no certificate
2112 supplied", which is not helpful.
2114 70. exigrep's output now also includes lines that are not associated with any
2115 message, but which match the given pattern. Implemented by a patch from
2116 Martin Sluka, which also tidied up the Perl a bit.
2118 71. Recipient callout verification, like sender verification, was using <> in
2119 the MAIL FROM command. This isn't really the right thing, since the actual
2120 sender may affect whether the remote host accepts the recipient or not. I
2121 have changed it to use the actual sender in the callout; this means that
2122 the cache record is now keyed on a recipient/sender pair, not just the
2123 recipient address. There doesn't seem to be a real danger of callout loops,
2124 since a callout by the remote host to check the sender would use <>.
2125 [SEE ABOVE: changed after hitting problems.]
2127 72. Exim treats illegal SMTP error codes that do not begin with 4 or 5 as
2128 temporary errors. However, in the case of such a code being given after
2129 the end of a data transmission (i.e. after ".") Exim was failing to write
2130 a retry record for the message. (Yes, there was some broken host that was
2131 actually sending 8xx at this point.)
2133 73. An unknown lookup type in a host list could cause Exim to panic-die when
2134 the list was checked. (An example that provoked this was putting <; in the
2135 middle of a list instead of at the start.) If this happened during a DATA
2136 ACL check, a -D file could be left lying around. This kind of configuration
2137 error no longer causes Exim to die; instead it causes a defer errror. The
2138 incident is still logged to the main and panic logs.
2140 74. Buglet left over from Exim 3 conversion. The message "too many messages
2141 in one connection" was written to the rejectlog but not the mainlog, except
2142 when address rewriting (yes!) was being logged.
2144 75. Added write_rejectlog option.
2146 76. When a system filter was run not as root (that is, when system_filter_user
2147 was set), the values of the $n variables were not being returned to the
2148 main process; thus, they were not subsequently available in the $sn
2151 77. Added +return_path_on_delivery log selector.
2153 78. A connection timeout was being treated differently from recipients deferred
2154 when testing hosts_max_try with a message that was older than the host's
2155 retry timeout. (The host should not be counted, thus allowing all hosts to
2156 be tried at least once before bouncing.) This may have been the cause of an
2157 occasionally reported bug whereby a message would remain on the queue
2158 longer than the retry timeout, but would be bounced if a delivery was
2159 forced. I say "may" because I never totally pinned down the problem;
2160 setting up timeout/retry tests is difficult. See also the next item.
2162 79. The ultimate address timeout was not being applied to errors that involved
2163 a combination of host plus message (for example, a timeout on a MAIL
2164 command). When an address resolved to a number of possible hosts, and they
2165 were not all tried for each delivery (e.g. because of hosts_max_try), a
2166 message could remain on the queue longer than the retry timeout.
2168 80. Sieve bug: "stop" inside "elsif" was broken. Applied a patch from Michael
2171 81. Fixed an obscure SMTP outgoing bug which required at least the following
2172 conditions: (a) there was another message waiting for the same server;
2173 (b) the server returned 5xx to all RCPT commands in the first message so
2174 that the message was not completed; (c) the server dropped the connection
2175 or gave a negative response to the RSET that Exim sends to abort the
2176 transaction. The observed case was a dropped connection after DATA that had
2177 been sent in pipelining mode. That is, the server had advertised PIPELINING
2178 but was not implementing it correctly. The effect of the bug was incorrect
2179 behaviour, such as trying another host, and this could lead to a crash.
2185 1. The 3rd arguments to getsockname(), getpeername(), and accept() in exim.c
2186 and daemon.c were passed as pointers to ints; they should have been
2187 pointers to socklen_t variables (which are typically unsigned ints).
2189 2. Some signed/unsigned type warnings in the os.c file for Linux have been
2192 3. Fixed a really odd bug that affected only the testing scheme; patching a
2193 certain fixed string in the binary changed the value of another string that
2194 happened to be identical to the end of the original first string.
2196 4. When gethostbyname() (or equivalent) is passed an IP address as a "host
2197 name", it returns that address as the IP address. On some operating
2198 systems (e.g. Solaris), it also passes back the IP address string as the
2199 "host name". However, on others (e.g. Linux), it passes back an empty
2200 string. Exim wasn't checking for this, and was changing the host name to an
2201 empty string, assuming it had been canonicized.
2203 5. Although rare, it is permitted to have more than one PTR record for a given
2204 IP address. I thought that gethostbyaddr() or getipnodebyaddr() always gave
2205 all the names associated with an address, because they do in Solaris.
2206 However, it seems that they do not in Linux for data that comes from the
2207 DNS. If an address in /etc/hosts has multiple names, they _are_ all given.
2208 I found this out when I moved to a new Linux workstation and tried to run
2209 the Exim test suite.
2211 To get round this problem I have changed the code so that it now does its
2212 own call to the DNS to look up PTR records when searching for a host name.
2213 If nothing can be found in the DNS, it tries gethostbyaddr(), so that
2214 addresses that are only in /etc/hosts are still found.
2216 This behaviour is, however, controlled by an option called host_lookup_
2217 order, which defaults to "bydns:byaddr". If people want to use the other
2218 order, or indeed, just use one or the other means of lookup, they can
2219 specify it in this variable.
2221 6. If a PTR record yields an empty name, Exim treats it as non-existent. In
2222 some operating systems, this comes back from gethostbyaddr() as an empty
2223 string, and this is what Exim used to test for. However, it seems that in
2224 other systems, "." is yielded. Exim now tests for this case too.
2226 7. The values of check_spool_space and check_log_space are now held internally
2227 as a number of kilobytes instead of an absolute number of bytes. If a
2228 numbers is specified without 'K' or 'M', it is rounded up to the nearest
2229 kilobyte. This means that much larger values can be stored.
2231 8. Exim monitor: an attempt to get the action menu when not actually pointing
2232 at a message produces an empty menu entitled "No message selected". This
2233 works on Solaris (OpenWindows). However, XFree86 does not like a menu with
2234 no entries in it ("Shell widget menu has zero width and/or height"). So I
2235 have added a single, blank menu entry in this case.
2237 9. Added ${quote_local_part.
2239 10. MIME decoding is now applied to the contents of Subject: header lines when
2242 11. Now that a reference to $sender_host_address automatically causes a reverse
2243 lookup to occur if necessary (4.13/18), there is no need to arrange for a
2244 host lookup before query-style lookups in lists that might use this
2245 variable. This has therefore been abolished, and the "net-" prefix is no
2246 longer necessary for query-style lookups.
2248 12. The Makefile for SCO_SV contained a setting of LDFLAGS. This appears to
2249 have been a typo for LFLAGS, so it has been changed.
2251 13. The install script calls Exim with "-C /dev/null" in order to find the
2252 version number. If ALT_CONFIG_PREFIX was set, this caused an error message
2253 to be output. Howeve, since Exim outputs its version number before the
2254 error, it didn't break the script. It just looked ugly. I fixed this by
2255 always allowing "-C /dev/null" if the caller is root.
2257 14. Ignore overlarge ACL variable number when reading spool file - insurance
2258 against a later release with more variables having written the file.
2260 15. The standard form for an IPv6 address literal was being rejected by EHLO.
2261 Example: [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
2262 this, as well as the form without the "IPv6" on the front.
2264 16. Added CHOWN_COMMAND=/usr/sbin/chown and LIBS=-lresolv to the
2265 OS/Makefile-Darwin file.
2267 17. Fixed typo in lookups/ldap.c: D_LOOKUP should be D_lookup. This applied
2268 only to LDAP libraries that do not have LDAP_OPT_DEREF.
2270 18. After change 4.21/52, "%ld" was used to format the contents of the $inode
2271 variable. However, some OS use ints for inodes. I've added cast to long int
2272 to get rid of the compiler warning.
2274 19. I had forgotten to lock out "/../" in configuration file names when
2275 ALT_CONFIG_PREFIX was set.
2277 20. Routers used for verification do not need to specify transports. However,
2278 if such a router generated a host list, and callout was configured, Exim
2279 crashed, because it could not find a port number from the (non-existent)
2280 transport. It now assumes port 25 in this circumstance.
2282 21. Added the -t option to exigrep.
2284 22. If LOOKUP_LSEARCH is defined, all three linear search methods (lsearch,
2285 wildlsearch, nwildlsearch) are compiled. LOOKUP_WILDLSEARCH and LOOKUP_
2286 NWILDLSEARCH are now obsolete, but retained for compatibility. If either of
2287 them is set, LOOKUP_LSEARCH is forced.
2289 23. "exim -bV" now outputs a list of lookups that are included in the binary.
2291 24. Added sender and host information to the "rejected by local_scan()" log
2292 line; previously there was no indication of these.
2294 25. Added .include_if_exists.
2296 26. Change 3.952/11 added an explicit directory sync on top of a file sync for
2297 Linux. It turns out that not all file systems support this. Apparently some
2298 versions of NFS do not. (It's rare to put Exim's spool on NFS, but people
2299 do it.) To cope with this, the error EINVAL, which means that sync-ing is
2300 not supported on the file descriptor, is now ignored when Exim is trying to
2301 sync a directory. This applies only to Linux.
2303 27. Added -DBIND_8_COMPAT to the CLFAGS setting for Darwin.
2305 28. In Darwin (MacOS X), the PAM headers are in /usr/include/pam and not in
2306 /usr/include/security. There's now a flag in OS/os.h-Darwin to cope with
2309 29. Added support for maildirsize files from supplied patch (modified a bit).
2311 30. The use of :fail: followed by an empty string could lead Exim to respond to
2312 sender verification failures with (e.g.):
2314 550 Verification failed for <xxx>
2315 550 Sender verify failed
2317 where the first response line was missing the '-' that indicates it is not
2318 the final line of the response.
2320 31. The loop for finding the name of the user that called Exim had a hardwired
2321 limit of 10; it now uses the value of finduser_retries, which is used for
2322 all other user lookups.
2324 32. Added $received_count variable, available in data and not_smtp ACLs, and at
2327 33. Exim was neglecting to zero errno before one call of strtol() when
2328 expanding a string and expecting an integer value. On some systems this
2329 resulted in spurious "integer overflow" errors. Also, it was casting the
2330 result into an int without checking.
2332 34. Testing for a connection timeout using "timeout_connect" in the retry rules
2333 did not work. The code looks as if it has *never* worked, though it appears
2334 to have been documented since at least releast 1.62. I have made it work.
2336 35. The "timeout_DNS" error in retry rules, also documented since at least
2337 1.62, also never worked. As it isn't clear exactly what this means, and
2338 clearly it isn't a major issue, I have abolished the feature by treating it
2339 as "timeout", and writing a warning to the main and panic logs.
2341 36. The display of retry rules for -brt wasn't always showing the error code
2344 37. Added new error conditions to retry rules: timeout_A, timeout_MX,
2345 timeout_connect_A, timeout_connect_MX.
2347 38. Rewriting the envelope sender at SMTP time did not allow it to be rewritten
2348 to the empty sender.
2350 39. The daemon was not analysing the content of -oX till after it had closed
2351 stderr and disconnected from the controlling terminal. This meant that any
2352 syntax errors were only noted on the panic log, and the return code from
2353 the command was 0. By re-arranging the code a little, I've made the
2354 decoding happen first, so such errors now appear on stderr, and the return
2355 code is 1. However, the actual setting up of the sockets still happens in
2356 the disconnected process, so errors there are still only recorded on the
2359 40. A daemon listener on a wildcard IPv6 socket that also accepts IPv4
2360 connections (as happens on some IP stacks) was logged at start up time as
2361 just listening for IPv6. It now logs "IPv6 with IPv4". This differentiates
2362 it from "IPv6 and IPv4", which means that two separate sockets are being
2365 41. The debug output for gethostbyname2() or getipnodebyname() failures now
2366 says whether AF_INET or AF_INET6 was passed as an argument.
2368 42. Exiwhat output was messed up when time zones were included in log
2371 43. Exiwhat now gives more information about the daemon's listening ports,
2372 and whether -tls-on-connect was used.
2374 44. The "port" option of the smtp transport is now expanded.
2376 45. A "message" modifier in a "warn" statement in a non-message ACL was being
2377 silently ignored. Now an error message is written to the main and panic
2380 46. There's a new ACL modifier called "logwrite" which writes to a log file
2381 as soon as it is encountered.
2383 47. Added $local_user_uid and $local_user_gid at routing time.
2385 48. Exim crashed when trying to verify a sender address that was being
2388 49. Exim was recognizing only a space character after ".include". It now also
2389 recognizes a tab character.
2391 50. Fixed several bugs in the Perl script that creates the exim.8 man page by
2392 extracting the relevant information from the specification. The man page no
2393 longer contains scrambled data for the -d option, and I've added a section
2394 at the front about calling Exim under different names.
2396 51. Added "extra_headers" argument to the "mail" command in filter files.
2398 52. Redirecting mail to an unqualified address in a Sieve filter caused Exim to
2401 53. Installed eximstats 1.29.
2403 54. Added transport_filter_timeout as a generic transport option.
2405 55. Exim no longer adds an empty Bcc: header to messages that have no To: or
2406 Cc: header lines. This was required by RFC 822, but it not required by RFC
2409 56. Exim used to add From:, Date:, and Message-Id: header lines to any
2410 incoming messages that did not have them. Now it does so only if the
2411 message originates locally, that is, if there is no associated remote host
2412 address. When Resent- header lines are present, this applies to the Resent-
2413 lines rather than the non-Resent- lines.
2415 57. Drop incoming SMTP connection after too many syntax or protocol errors. The
2416 limit is controlled by smtp_max_synprot_errors, defaulting to 3.
2418 58. Messages for configuration errors now include the name of the main
2419 configuration file - useful now that there may be more than one file in a
2420 list (.included file names were always shown).
2422 59. Change 4.21/82 (run initgroups() when starting the daemon) causes problems
2423 for those rare installations that do not start the daemon as root or run it
2424 setuid root. I've cut out the call to initgroups() if the daemon is not
2427 60. The Exim user and group can now be bound into the binary as text strings
2428 that are looked up at the start of Exim's processing.
2430 61. Applied a small patch for the Interbase code, supplied by Ard Biesheuvel.
2432 62. Added $mailstore_basename variable.
2434 63. Installed patch to sieve.c from Michael Haardt.
2436 64. When Exim failed to open the panic log after failing to open the main log,
2437 the original message it was trying to log was written to stderr and debug
2438 output, but if they were not available (the usual case in production), it
2439 was lost. Now it is written to syslog before the two lines that record the
2440 failures to open the logs.
2442 65. Users' Exim filters run in subprocesses under the user's uid. It is
2443 possible for a "deliver" command or an alias in a "personal" command to
2444 provoke an address rewrite. If logging of address rewriting is configured,
2445 this fails because the process is not running as root or exim. There may be
2446 a better way of dealing with this, but for the moment (because 4.30 needs
2447 to be released), I have disabled address rewrite logging when running a
2448 filter in a non-root, non-exim process.
2454 1. The buildconfig auxiliary program wasn't quoting the value set for
2455 HEADERS_CHARSET. This caused a compilation error complaining that 'ISO' was
2456 not defined. This bug was masked in 4.22 by the effect that was fixed in
2459 2. Some messages that were rejected after a message id was allocated were
2460 shown as "incomplete" by exigrep. It no longer does this for messages that
2461 are rejected by local_scan() or the DATA or non-SMTP ACLs.
2463 3. If a Message-ID: header used a domain literal in the ID, and Exim did not
2464 have allow_domain_literals set, the ID did not get logged in the <= line.
2465 Domain literals are now always recognized in Message-ID: header lines.
2467 4. The first argument for a ${extract expansion item is the key name or field
2468 number. Leading and trailing spaces in this item were not being ignored,
2469 causing some misleading effects.
2471 5. When deliver_drop_privilege was set, single queue runner processes started
2472 manually (i.e. by the command "exim -q") or by the daemon (which uses the
2473 same command in the process it spins off) were not dropping privilege.
2475 6. When the daemon running as "exim" started a queue runner, it always
2476 re-executed Exim in the spun-off process. This is a waste of effort when
2477 deliver_drop_privilege is set. The new process now just calls the
2478 queue-runner function directly.
2484 1. Typo in the src/EDITME file: it referred to HEADERS_DECODE_TO instead of
2487 2. Change 4.21/73 introduced a bug. The pid file path set by -oP was being
2488 ignored. Though the use of -oP was forcing the writing of a pid file, it
2489 was always written to the default place.
2491 3. If the message "no IP address found for host xxxx" is generated during
2492 incoming verification, it is now followed by identification of the incoming
2493 connection (so you can more easily find what provoked it).
2495 4. Bug fix for Sieve filters: "stop" inside a block was not working properly.
2497 5. Added some features to "harden" Exim a bit more against certain attacks:
2499 (a) There is now a build-time option called FIXED_NEVER_USERS that can
2500 be put in Local/Makefile. This is like the never_users runtime option,
2501 but it cannot be overridden. The default setting is "root".
2503 (b) If ALT_CONFIG_PREFIX is defined in Local/Makefile, it specifies a
2504 prefix string with which any file named in a -C command line option
2507 (c) If ALT_CONFIG_ROOT_ONLY is defined in Local/Makefile, root privilege
2508 is retained for -C and -D only if the caller of Exim is root. Without
2509 it, the exim user may also use -C and -D and retain privilege.
2511 (d) If DISABLE_D_OPTION is defined in Local/Makefile, the use of the -D
2512 command line option is disabled.
2514 6. Macro names set by the -D option must start with an upper case letter, just
2515 like macro names defined in the configuration file.
2517 7. Added "dereference=" facility to LDAP.
2519 8. Two instances of the typo "uknown" in the source files are fixed.
2521 9. If a PERL_COMMAND setting in Local/Makefile was not at the start of a line,
2522 the Configure-Makefile script screwed up while processing it.
2524 10. Incorporated PCRE 4.4.
2526 11. The SMTP synchronization check was not operating right at the start of an
2527 SMTP session. For example, it could not catch a HELO sent before the client
2528 waited for the greeting. There is now a check for outstanding input at the
2529 point when the greeting is written. Because of the duplex, asynchronous
2530 nature of TCP/IP, it cannot be perfect - the incorrect input may be on its
2531 way, but not yet received, when the check is performed.
2533 12. Added tcp_nodelay to make it possible to turn of the setting of TCP_NODELAY
2534 on TCP/IP sockets, because this apparently causes some broken clients to
2537 13. Installed revised OS/Makefile-CYGWIN and OS/os.c-cygwin (the .h file was
2538 unchanged) from the Cygwin maintainer.
2540 14. The code for -bV that shows what is in the binary showed "mbx" when maildir
2541 was supported instead of testing for mbx. Effectively a typo.
2543 15. The spa authenticator server code was not checking that the input it
2544 received was valid base64.
2546 16. The debug output line for the "set" modifier in ACLs was not showing the
2547 name of the variable that was being set.
2549 17. Code tidy: the variable type "vtype_string" was never used. Removed it.
2551 18. Previously, a reference to $sender_host_name did not cause a DNS reverse
2552 lookup on its own. Something else was needed to trigger the lookup. For
2553 example, a match in host_lookup or the need for a host name in a host list.
2554 Now, if $sender_host_name is referenced and the host name has not yet been
2555 looked up, a lookup is performed. If the lookup fails, the variable remains
2556 empty, and $host_lookup_failed is set to "1".
2558 19. Added "eqi" as a case-independent comparison operator.
2560 20. The saslauthd authentication condition could segfault if neither service
2561 nor realm was specified.
2563 21. If an overflowing value such as "2048M" was set for message_size_limit, the
2564 error message that was logged was misleading, and incoming SMTP
2565 connections were dropped. The message is now more accurate, and temporary
2566 errors are given to SMTP connections.
2568 22. In some error situations (such as 21 above) Exim rejects all SMTP commands
2569 (except RSET) with a 421 error, until QUIT is received. However, it was
2570 failing to send a response to QUIT.
2572 23. The HELO ACL was being run before the code for helo_try_verify_hosts,
2573 which made it impossible to use "verify = helo" in the HELO ACL. The HELO
2574 ACL is now run after the helo_try_verify_hosts code.
2576 24. "{MD5}" and "{SHA1}" are now recognized as equivalent to "{md5"} and
2577 "{sha1}" in the "crypteq" expansion condition (in fact the comparison is
2578 case-independent, so other case variants are also recognized). Apparently
2579 some systems use these upper case variants.
2581 25. If more than two messages were waiting for the same host, and a transport
2582 filter was specified for the transport, Exim sent two messages over the
2583 same TCP/IP connection, and then failed with "socket operation on non-
2584 socket" when it tried to send the third.
2586 26. Added Exim::debug_write and Exim::log_write for embedded Perl use.
2588 27. The extern definition of crypt16() in expand.c was not being excluded when
2589 the OS had its own crypt16() function.
2591 28. Added bounce_return_body as a new option, and bounce_return_size_limit
2592 as a preferred synonym for return_size_limit, both as an option and as an
2595 29. Added LIBS=-liconv to OS/Makefile-OSF1.
2597 30. Changed the default configuration ACL to relax the local part checking rule
2598 for addresses that are not in any local domains. For these addresses,
2599 slashes and pipe symbols are allowed within local parts, but the sequence
2600 /../ is explicitly forbidden.
2602 31. SPA server authentication was not clearing the challenge buffer before
2605 32. log_message in a "warn" ACL statement was writing to the reject log as
2606 well as to the main log, which contradicts the documentation and doesn't
2607 seem right (because no rejection is happening). So I have stopped it.
2609 33. Added Ard Biesheuvel's lookup code for accessing an Interbase database.
2610 However, I am unable to do any testing of this.
2612 34. Fixed an infelicity in the appendfile transport. When checking directories
2613 for a mailbox, to see if any needed to be created, it was accidentally
2614 using path names with one or more superfluous leading slashes; tracing
2615 would show up entries such as stat("///home/ph10", 0xFFBEEA48).
2617 35. If log_message is set on a "discard" verb in a MAIL or RCPT ACL, its
2618 contents are added to the log line that is written for every discarded
2619 recipient. (Previously a log_message setting was ignored.)
2621 36. The ${quote: operator now quotes the string if it is empty.
2623 37. The install script runs exim in order to find its version number. If for
2624 some reason other than non-existence or emptiness, which it checks, it
2625 could not run './exim', it was installing it with an empty version number,
2626 i.e. as "exim-". This error state is now caught, and the installation is
2629 38. An argument was missing from the function that creates an error message
2630 when Exim fails to connect to the socket for saslauthd authentication.
2631 This could cause Exim to crash, or give a corrupted message.
2633 39. Added isip, isip4, and isip6 to ${if conditions.
2635 40. The ACL variables $acl_xx are now saved with the message, and can be
2636 accessed later in routers, transports, and filters.
2638 41. The new lookup type nwildlsearch is like wildlsearch, except that the key
2639 strings in the file are not string-expanded.
2641 42. If a MAIL command specified a SIZE value that was too large to fit into an
2642 int variable, the check against message_size_limit failed. Such values are
2643 now forced to INT_MAX, which is around 2Gb for a 32-bit variable. Maybe one
2644 day this will have to be increased, but I don't think I want to be around
2645 when emails are that large.
2652 1. Removed HAVE_ICONV=yes from OS/Makefile-FreeBSD, since it seems that
2653 iconv() is not standard in FreeBSD.
2655 2. Change 4.21/17 was buggy and could cause stack overwriting on a system with
2656 IPv6 enabled. The observed symptom was a segmentation fault on return from
2657 the function os_common_find_running_interfaces() in src/os.c.
2659 3. In the check_special_case() function in daemon.c I had used "errno" as an
2660 argument name, which causes warnings on some systems. This was basically a
2661 typo, since it was named "eno" in the comments!
2663 4. The code that waits for the clock to tick (at a resolution of some fraction
2664 of a second) so as to ensure message-id uniqueness was always waiting for
2665 at least one whole tick, when it could have waited for less. [This is
2666 almost certainly not relevant at current processor speeds, where it is
2667 unlikely to ever wait at all. But we try to future-proof.]
2669 5. The function that sleeps for a time interval that includes fractions of a
2670 second contained a race. It did not block SIGALRM between setting the
2671 timer, and suspending (a couple of lines later). If the interval was short
2672 and the sigsuspend() was delayed until after it had expired, the suspension
2673 never ended. On busy systems this could lead to processes getting stuck for
2676 6. Some uncommon configurations may cause a lookup to happen in a queue runner
2677 process, before it forks any delivery processes. The open lookup caching
2678 mechanism meant that the open file or database connection was passed into
2679 the delivery process. The problem was that delivery processes always tidy
2680 up cached lookup data. This could cause a problem for the next delivery
2681 process started by the queue runner, because the external queue runner
2682 process does not know about the closure. So the next delivery process
2683 still has data in the lookup cache. In the case of a file lookup, there was
2684 no problem because closing a file descriptor in a subprocess doesn't affect
2685 the parent. However, if the lookup was caching a connection to a database,
2686 the connection was closed, and the second delivery process was likely to
2687 see errors such as "PGSQL: query failed: server closed the connection
2688 unexpectedly". The problem has been fixed by closing all cached lookups
2689 in a queue runner before running a delivery process.
2691 7. Compiler warning on Linux for the second argument of iconv(), which doesn't
2692 seem to have the "const" qualifier which it has on other OS. I've
2695 8. Change 4.21/2 was too strict. It is only if there are two authenticators
2696 *of the same type* (client or server) with the same public name that an
2697 error should be diagnosed.
2699 9. When Exim looked up a host name for an IP address, but failed to find the
2700 original IP address when looking up the host name (a safety check), it
2701 output the message "<ip address> does not match any IP for NULL", which was
2702 confusing, to say the least. The bug was that the host name should have
2703 appeared instead of "NULL".
2705 10. Since release 3.03, if Exim is called by a uid other than root or the Exim
2706 user that is built into the binary, and the -C or -D options is used, root
2707 privilege is dropped before the configuration file is read. In addition,
2708 logging is switched to stderr instead of the normal log files. If the
2709 configuration then re-defines the Exim user, the unprivileged environment
2710 is probably not what is expected, so Exim logs a panic warning message (but
2713 However, if deliver_drop_privilege is set, the unprivileged state may well
2714 be exactly what is intended, so the warning has been cut out in that case,
2715 and Exim is allowed to try to write to its normal log files.
2721 1. smtp_return_error_details was not giving details for temporary sender
2722 or receiver verification errors.
2724 2. Diagnose a configuration error if two authenticators have the same public
2727 3. Exim used not to create the message log file for a message until the first
2728 delivery attempt. This could be confusing when incoming messages were held
2729 for policy or load reasons. The message log file is now created at the time
2730 the message is received, and an initial "Received" line is written to it.
2732 4. The automatically generated man page for command line options had a minor
2733 bug that caused no ill effects; however, a more serious problem was that
2734 the procedure for building the man page automatically didn't always
2735 operate. Consequently, release 4.20 contains an out-of-date version. This
2736 shouldn't happen again.
2738 5. When building Exim with embedded Perl support, the script that builds the
2739 Makefile was calling 'perl' to find its compile-time parameters, ignoring
2740 any setting of PERL_COMMAND in Local/Makefile. This is now fixed.
2742 6. The freeze_tell option was not being used for messages that were frozen on
2743 arrival, either by an ACL or by local_scan().
2745 7. Added the smtp_incomplete_transaction log selector.
2747 8. After STARTTLS, Exim was not forgetting that it had advertised AUTH, so it
2748 was accepting AUTH without a new EHLO.
2750 9. Added tls_remember_esmtp to cope with YAEB. This allows AUTH and other
2751 ESMTP extensions after STARTTLS without a new EHLO, in contravention of the
2754 10. Logging of TCP/IP connections (when configured) now happens in the main
2755 daemon process instead of the child process, so that the TCP/IP connection
2756 count is more accurate (but it can never be perfect).
2758 11. The use of "drop" in a nested ACL was not being handled correctly in the
2759 outer ACL. Now, if condition failure induced by the nested "drop" causes
2760 the outer ACL verb to deny access ("accept" or "discard" after "endpass",
2761 or "require"), the connection is dropped.
2763 12. Similarly, "discard" in a nested ACL wasn't being handled. A nested ACL
2764 that yield "discard" can now be used with an "accept" or a "discard" verb,
2765 but an error is generated for any others (because I can't see a useful way
2766 to define what should happen).
2768 13. When an ACL is read dynamically from a file (or anywhere else), the lines
2769 are now processed in the same way as lines in the Exim configuration file.
2770 In particular, continuation lines are supported.
2772 14. Added the "dnslists = a.b.c!=n.n.n.n" feature.
2774 15. Added -ti meaning -t -i.
2776 16. Check for letters, digits, hyphens, and dots in the names of dnslist
2777 domains, and warn by logging if others are found.
2779 17. At least on BSD, alignment is not guarenteed for the array of ifreq's
2780 returned from GIFCONF when Exim is trying to find the list of interfaces on
2781 a host. The code in os.c has been modified to copy each ifreq to an aligned
2782 structure in all cases.
2784 Also, in some cases, the returned ifreq's were being copied to a 'struct
2785 ifreq' on the stack, which was subsequently passed to host_ntoa(). That
2786 means the last couple of bytes of an IPv6 address could be chopped if the
2787 ifreq contained only a normal sockaddr (14 bytes storage).
2789 18. Named domain lists were not supported in the hosts_treat_as_local option.
2790 An entry such as +xxxx was not recognized, and was treated as a literal
2793 19. Ensure that header lines added by a DATA ACL are included in the reject log
2794 if the ACL subsequently rejects the message.
2796 20. Upgrade the cramtest.pl utility script to use Digest::MD5 instead of just
2797 MD5 (which is deprecated).
2799 21. When testing a filter file using -bf, Exim was writing a message when it
2800 took the sender from a "From " line in the message, but it was not doing so
2801 when it took $return_path from a Return-Path: header line. It now does.
2803 22. If the contents of a "message" modifier for a "warn" ACL verb do not begin
2804 with a valid header line field name (a series of printing characters
2805 terminated by a colon, Exim now inserts X-ACL-Warn: at the beginning.
2807 23. Changed "disc" in the source to "disk" to conform to the documentation and
2808 the book and for uniformity.
2810 24. Ignore Sendmail's -Ooption=value command line item.
2812 25. When execve() failed while trying to run a command in a pipe transport,
2813 Exim was returning EX_UNAVAILBLE (69) from the subprocess. However, this
2814 could be confused with a return value of 69 from the command itself. This
2815 has been changed to 127, the value the shell returns if it is asked to run
2816 a non-existent command. The wording for the related log line suggests a
2817 non-existent command as the problem.
2819 26. If received_header_text expands to an empty string, do not add a Received:
2820 header line to the message. (Well, it adds a token one on the spool, but
2821 marks it "old" so that it doesn't get used or transmitted.)
2823 27. Installed eximstats 1.28 (addition of -nt option).
2825 28. There was no check for failure on the call to getsockname() in the daemon
2826 code. This can fail if there is a shortage of resources on the system, with
2827 ENOMEM, for example. A temporary error is now given on failure.
2829 29. Contrary to the C standard, it seems that in some environments, the
2830 equivalent of setlocale(LC_ALL, "C") is not obeyed at the start of a C
2831 program. Exim now does this explicitly; it affects the formatting of
2832 timestamps using strftime().
2834 30. If exiqsumm was given junk data, it threw up some uninitialized variable
2835 complaints. I've now initialized all the variables, to avoid this.
2837 32. Header lines added by a system filter were not being "seen" during
2838 transport-time rewrites.
2840 33. The info_callback() function passed to OpenSSL is set up with type void
2841 (*)(SSL *, int, int), as described somewhere. However, when calling the
2842 function (actually a macro) that sets it up, the type void(*)() is
2843 expected. I've put in a cast to prevent warnings from picky compilers.
2845 34. If a DNS black list lookup found a CNAME record, but there were no A
2846 records associated with the domain it pointed at, Exim crashed.
2848 35. If a DNS black list lookup returned more than one A record, Exim ignored
2849 all but the first. It now scans all returned addresses if a particular IP
2850 value is being sought. In this situation, the contents of the
2851 $dnslist_value variable are a list of all the addresses, separated by a
2854 36. Tightened up the rules for host name lookups using reverse DNS. Exim used
2855 to accept a host name and all its aliases if the forward lookup for any of
2856 them yielded the IP address of the incoming connection. Now it accepts only
2857 those names whose forward lookup yields the correct IP address. Any other
2858 names are discarded. This closes a loophole whereby a rogue DNS
2859 administrator could create reverse DNS records to break through a
2860 wildcarded host restriction in an ACL.
2862 37. If a user filter or a system filter that ran in a subprocess used any of
2863 the numerical variables ($1, $2 etc), or $thisaddress, in a pipe command,
2864 the wrong values were passed to the pipe command ($thisaddress had the
2865 value of $0, $0 had the value of $1, etc). This bug was introduced by
2866 change 4.11/101, and not discovered because I wrote an inadequate test. :-(
2868 38. Improved the line breaking for long SMTP error messages from ACLs.
2869 Previously, if there was no break point between 40 and 75 characters, Exim
2870 left the rest of the message alone. Two changes have been made: (a) I've
2871 reduced the minimum length to 35 characters; (b) if it can't find a break
2872 point between 35 and 75 characters, it looks ahead and uses the first one
2873 that it finds. This may give the occasional overlong line, but at least the
2874 remaining text gets split now.
2876 39. Change 82 of 4.11 was unimaginative. It assumed the limit on the number of
2877 file descriptors might be low, and that setting 1000 would always raise it.
2878 It turns out that in some environments, the limit is already over 1000 and
2879 that lowering it causes trouble. So now Exim takes care not to decrease it.
2881 40. When delivering a message, the value of $return_path is set to $sender_
2882 address at the start of routing (routers may change the value). By an
2883 oversight, this default was not being set up when an address was tested by
2884 -bt or -bv, which affected the outcome if any router or filter referred to
2887 41. The idea of the "warn" ACL verb is that it adds a header or writes to the
2888 log only when "message" or "log_message" are set. However, if one of the
2889 conditions was an address verification, or a call to a nested ACL, the
2890 messages generated by the underlying test were being passed through. This
2891 no longer happens. The underlying message is available in $acl_verify_
2892 message for both "message" and "log_message" expansions, so it can be
2893 passed through if needed.
2895 42. Added RFC 2047 interpretation of header lines for $h_ expansions, with a
2896 new expansion $bh_ to give the encoded byte string without charset
2897 translation. Translation happens only if iconv() is available; HAVE_ICONV
2898 indicates this at build time. HEADERS_CHARSET gives the charset to
2899 translate to; headers_charset can change it in the configuration, and
2900 "headers charset" can change it in an individual filter file.
2902 43. Now that we have a default RFC 2047 charset (see above), the code in Exim
2903 that creates RFC 2047 encoded "words" labels them as that charset instead
2904 of always using iso-8859-1. The cases are (i) the explicit ${rfc2047:
2905 expansion operator; (ii) when Exim creates a From: line for a local
2906 message; (iii) when a header line is rewritten to include a "phrase" part.
2908 44. Nasty bug in exiqsumm: the regex to skip already-delivered addresses was
2909 buggy, causing it to skip the first lines of messages whose message ID
2910 ended in 'D'. This would not have bitten before Exim release 4.14, because
2911 message IDs were unlikely to end in 'D' before then. The effect was to have
2912 incorrect size information for certain domains.
2914 45. #include "config.h" was missing at the start of the crypt16.c module. This
2915 caused trouble on Tru64 (aka OSF1) systems, because HAVE_CRYPT16 was not
2918 46. If there was a timeout during a "random" callout check, Exim treated it as
2919 a failure of the random address, and carried on sending RSET and the real
2920 address. If the delay was just some slowness somewhere, the response to the
2921 original RCPT would be taken as a response to RSET and so on, causing
2922 mayhem of various kinds.
2924 47. Change 50 for 4.20 was a heap of junk. I don't know what I was thinking
2925 when I implemented it. It didn't allow for the fact that some option values
2926 may legitimatetly be negative (e.g. size_addition), and it didn't even do
2927 the right test for positive values.
2929 48. Domain names in DNS records are case-independent. Exim always looks them up
2930 in lower case. Some resolvers return domain names in exactly the case they
2931 appear in the zone file, that is, they may contain uppercase letters. Not
2932 all resolvers do this - some return always lower case. Exim was treating a
2933 change of case by a resolver as a change of domain, similar to a widening
2934 of a domain abbreviation. This triggered its re-routing code and so it was
2935 trying to route what was effectively the same domain again. This normally
2936 caused routing to fail (because the router wouldn't handle the domain
2937 twice). Now Exim checks for this case specially, and just changes the
2938 casing of the domain that it ultimately uses when it transmits the message
2941 49. Added Sieve (RFC 3028) support, courtesy of Michael Haardt's contributed
2944 50. If a filter generated a file delivery with a non-absolute name (possible if
2945 no home directory exists for the router), the forbid_file option was not
2948 51. Added '&' feature to dnslists, to provide bit mask matching in addition to
2949 the existing equality matching.
2951 52. Exim was using ints instead of ino_t variables in some places where it was
2952 dealing with inode numbers.
2954 53. If TMPDIR is defined in Local/Makefile (default in src/EDITME is
2955 TMPDIR="/tmp"), Exim checks for the presence of an environment variable
2956 called TMPDIR, and if it finds it is different, it changes its value.
2958 54. The smtp_printf() function is now made available to local_scan() so
2959 additional output lines can be written before returning. There is also an
2960 smtp_fflush() function to enable the detection of a dropped connection.
2961 The variables smtp_input and smtp_batched_input are exported to
2964 55. Changed the default runtime configuration: the message "Unknown user"
2965 has been removed from the ACL, and instead placed on the localuser router,
2966 using the cannot_route_message feature. This means that any verification
2967 failures that generate their own messages won't get overridden. Similarly,
2968 the "Unrouteable address" message that was in the ACL for unverifiable
2969 relay addresses has also been removed.
2971 56. Added hosts_avoid_esmtp to the smtp transport.
2973 57. The exicyclog script was not checking for the esoteric option
2974 CONFIGURE_FILE_USE_EUID in the Local/Makefile. It now does this, but it
2975 will work only if exicyclog is run under the appropriate euid.
2977 58. Following a discussion on the list, the rules by which Exim recognises line
2978 endings on incoming messages have been changed. The -dropcr and drop_cr
2979 options are now no-ops, retained only for backwards compatibility. The
2980 following line terminators are recognized: LF CRLF CR. However, special
2981 processing applies to CR:
2983 (i) The sequence CR . CR does *not* terminate an incoming SMTP message,
2984 nor a local message in the state where . is a terminator.
2986 (ii) If a bare CR is encountered in a header line, an extra space is added
2987 after the line terminator so as not to end the header. The reasoning
2988 behind this is that bare CRs in header lines are most likely either
2989 to be mistakes, or people trying to play silly games.
2991 59. The size of a message, as listed by "-bp" or in the Exim monitor window,
2992 was being incorrectly given as 18 bytes larger than it should have been.
2993 This is a VOB (very old bug).
2995 60. This may never have affected anything current, but just in case it has:
2996 When the local host is found other than at the start of a list of hosts,
2997 the local host, those with the same MX, and any that follow, are discarded.
2998 When the list in question was part of a longer list of hosts, the following
2999 hosts (not currently being processed) were also being discarded. This no
3000 longer happens. I'm not sure if this situation could ever has previously
3003 61. Added the "/MX" feature to lists of hosts in the manualroute and query
3006 62. Whenever Exim generates a new message, it now adds an Auto-Submitted:
3007 header. This is something that is recommended in a new Internet Draft, and
3008 is something that is documented as being done by Sendmail. There are two
3009 possible values. For messages generated by the autoreply transport, Exim
3012 Auto-Submitted: auto-replied
3014 whereas for all other generated messages (e.g. bounces) it adds
3016 Auto-Submitted: auto-generated
3018 63. The "personal" condition in filters now includes a test for the
3019 Auto-Submitted: header. If it contains the string "auto-" the message it
3020 not considered personal.
3022 64. Added rcpt_include_affixes as a generic transport option.
3024 65. Added queue_only_override (default true).
3026 66. Added the syslog_duplication option.
3028 67. If what should have been the first header line of a message consisted of
3029 a space followed by a colon, Exim was mis-interpreting it as a header line.
3030 It isn't of course - it is syntactically invalid and should therefore be
3031 treated as the start of the message body. The misbehaviour could have
3032 caused a number of strange effects, including loss of data in subsequent
3033 header lines, and spool format errors.
3035 68. Formerly, the AUTH parameter on a MAIL command was trusted only if the
3036 client host had authenticated. This control can now be exercised by an ACL
3037 for more flexibility.
3039 69. By default, callouts do not happen when testing with -bh. There is now a
3040 variant, -bhc, which does actually run the callout code, including
3041 consulting and updating the callout cache.
3043 70. Added support for saslauthd authentication, courtesy of Alexander
3046 71. If statvfs() failed on the spool or log directories while checking their
3047 size for availability, Exim confusingly gave the error "space shortage".
3048 Furthermore, in debugging mode it crashed with a floating point exception.
3049 These checks are done if check_{spool,log}_{space,inodes} are set, and when
3050 an SMTP message arrives with SIZE= on the MAIL command. As this is a really
3051 serious problem, Exim now writes to the main and panic logs when this
3052 happens, with details of the failure. It then refuses to accept the
3053 incoming message, giving the message "spool directory problem" or "log
3054 directory problem" with a 421 code for SMTP messages.
3056 72. When Exim is about to re-exec itself, it ensures that the file descriptors
3057 0, 1, and 2 exist, because some OS complain for execs without them (see
3058 ChangeLog 4.05/30). If necessary, Exim opens /dev/null to use for these
3059 descriptors. However, the code omitted to check that the open succeeded,
3060 causing mysterious errors if for some reason the permissions on /dev/null
3061 got screwed. Now Exim writes a message to the main and panic logs, and
3062 bombs out if it can't open /dev/null.
3064 73. Re-vamped the way daemon_smtp_port, local_interfaces, and -oX work and
3065 interact so that it is all more flexible. It is supposed to remain
3066 backwards compatible. Also added extra_local_interfaces.
3068 74. Invalid data sent to a SPA (NTLM) server authenticator could cause the code
3069 to bomb out with an assertion failure - to the client this appears as a
3070 connection drop. This problem occurs in the part of the code that was taken
3071 from the Samba project. Fortunately, the assertion is in a very simple
3072 function, so I have fixed this by reproducing the function inline in the
3073 one place where it is called, and arranging for authentication to fail
3074 instead of killing the process with assert().
3076 75. The SPA client code was not working when the server requested OEM rather
3077 than Unicode encoding.
3079 76. Added code to make require_files with a specific uid setting more usable in
3080 the case where statting the file as root fails - usually a non-root-mounted
3081 NFS file system. When this happens and the failure is EACCES, Exim now
3082 forks a subprocess and does the per-uid checking as the relevant uid.
3084 77. Added process_log_path.
3086 78. If log_file_path was not explicitly set, a setting of check_log_space or
3087 check_log_inodes was ignored.
3089 79. If a space check for the spool or log partitions fails, the incident is now
3090 logged. Of course, in the latter case the data may get lost...
3092 80. Added the %p formatting code to string_format() so that it can be used to
3093 print addresses in debug_print(). Adjusted all the address printing in the
3094 debugging in store.c to use %p rather than %d.
3096 81. There was a concern that a line of code in smtp_in.c could overflow a
3097 buffer if a HELO/EHLO command was given followed by 500 or so spaces. As
3098 initially expressed, the concern was not well-founded, because trailing
3099 spaces are removed early. However, if the trailing spaces were followed by
3100 a NULL, they did not get removed, so the overflow was possible. Two fixes
3103 (a) I re-wrote the offending code in a cleaner fashion.
3104 (b) If an incoming SMTP command contains a NULL character, it is rejected
3107 82. When Exim changes uid/gid to the Exim user at daemon start time, it now
3108 runs initgroups(), so that if the Exim user is in any additional groups,
3109 they will be used during message reception.
3115 The change log for 4.20 and earlier releases has been archived.
projects / exim.git / blob