1 $Cambridge: exim/doc/doc-txt/ChangeLog,v 1.26 2004/11/12 12:01:52 ph10 Exp $
3 Change log file for Exim from version 4.21
4 -------------------------------------------
10 1. Minor wording change to the doc/README.SIEVE file.
12 2. Change 4.43/35 introduced a bug: if quota_filecount was set, the
13 computation of the current number of files was incorrect.
15 3. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
16 bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
19 4. Give more explanation in the error message when the command for a transport
20 filter fails to execute.
22 5. There are several places where Exim runs a non-Exim command in a
23 subprocess. The SIGUSR1 signal should be disabled for these processes. This
24 was being done only for the command run by the queryprogram router. It is
25 now done for all such subprocesses. The other cases are: ${run, transport
26 filters, and the commands run by the lmtp and pipe transports.
28 6. Added CONFIGURE_GROUP build-time option.
30 7. Some older OS have a limit of 256 on the maximum number of file
31 descriptors. Exim was using setrlimit() to set 1000 as a large value
32 unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
33 systems. I've change it so that if it can't get 1000, it tries for 256.
35 8. "control=submission" was allowed, but had no effect, in a DATA ACL. This
36 was an oversight, and furthermore, ever since the addition of extra
37 controls (e.g. 4.43/32), the checks on when to allow different forms of
38 "control" were broken. There should now be diagnostics for all cases when a
39 control that does not make sense is encountered.
41 9. Added the /retain_sender option to "control=submission".
43 10. $recipients is now available in the predata ACL (oversight).
45 11. Tidy the search cache before the fork to do a delivery from a message
46 received from the command line. Otherwise the child will trigger a lookup
47 failure and thereby defer the delivery if it tries to use (for example) a
48 cached ldap connection that the parent has called unbind on.
50 12. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
51 of $address_data from the recipient verification was clobbered by the
54 13. The value of address_data from a sender verification is now available in
55 $sender_address_data in subsequent conditions in the ACL statement.
57 14. Added forbid_sieve_filter and forbid_exim_filter to the redirect router.
59 15. Added a new option "connect=<time>" to callout options, to set a different
62 16. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
63 was its contents. (It was OK if the option was not defined at all.)
65 17. A "Completed" log line is now written for messages that are removed from
66 the spool by the -Mrm option.
68 18. New variables $sender_verify_failure and $recipient_verify_failure contain
69 information about exactly what failed.
71 19. Added -dd to debug only the daemon process.
73 20. Incorporated Michael Haardt's patch to ldap.c for improving the way it
74 handles timeouts, both on the server side and network timeouts. Renamed the
75 CONNECT parameter as NETTIMEOUT (but kept the old name for compatibility).
77 21. The rare case of EHLO->STARTTLS->HELO was setting the protocol to "smtp".
78 It is now set to "smtps".
80 22. $host_address is now set to the target address during the checking of
83 23. When checking ignore_target_hosts for an ipliteral router, no host name was
84 being passed; this would have caused $sender_host_name to have been used if
85 matching the list had actually called for a host name (not very likely,
86 since this list is usually IP addresses). A host name is now passed as
89 24. Changed the calls that set up the SIGCHLD handler in the daemon to use the
90 code that specifies a non-restarting handler (typically sigaction() in
91 modern systems) in an attempt to fix a rare and obscure crash bug.
93 25. Narrowed the window for a race in the daemon that could cause it to ignore
94 SIGCHLD signals. This is not a major problem, because they are used only to
95 wake it up if nothing else does.
97 26. A malformed maildirsize file could cause Exim to calculate negative values
98 for the mailbox size or file count. Odd effects could occur as a result.
99 The maildirsize information is now recalculated if the size or filecount
102 27. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
103 support for a long time. Removed HAVE_SYS_VFS_H.
105 28. Installed the latest version of exipick from John Jetmore.
111 1. Fixed a longstanding but relatively impotent bug: a long time ago, before
112 PIPELINING, the function smtp_write_command() used to return TRUE or FALSE.
113 Now it returns an integer. A number of calls were still expecting a T/F
114 return. Fortuitously, in all cases, the tests worked in OK situations,
115 which is the norm. However, things would have gone wrong on any write
116 failures on the smtp file descriptor. This function is used when sending
117 messages over SMTP and also when doing verify callouts.
119 2. When Exim is called to do synchronous delivery of a locally submitted
120 message (the -odf or -odi options), it no longer closes stderr before doing
123 3. Implemented the mua_wrapper option.
125 4. Implemented mx_fail_domains and srv_fail_domains for the dnslookup router.
127 5. Implemented the functions header_remove(), header_testname(),
128 header_add_at_position(), and receive_remove_recipient(), and exported them
131 6. If an ACL "warn" statement specified the addition of headers, Exim already
132 inserted X-ACL-Warn: at the start if there was no header name. However, it
133 was not making this test for the second and subsequent header lines if
134 there were newlines in the string. This meant that an invalid header could
135 be inserted if Exim was badly configured.
137 7. Allow an ACL "warn" statement to add header lines at the start or after all
138 the Received: headers, as well as at the end.
140 8. Added the rcpt_4xx retry error code.
142 9. Added postmaster_mailfrom=xxx to callout verification option.
144 10. Added mailfrom=xxxx to the callout verification option, for verify=
147 11. ${substr_1_:xxxx} and ${substr__3:xxxx} are now diagnosed as syntax errors
148 (they previously behaved as ${substr_1_0:xxxx} and ${substr:_0_3:xxxx}).
150 12. Inserted some casts to stop certain compilers warning when using pointer
151 differences as field lengths or precisions in printf-type calls (mostly
152 affecting debugging statements).
154 13. Added optional readline() support for -be (dynamically loaded).
156 14. Obscure bug fix: if a message error (e.g. 4xx to MAIL) happened within the
157 same clock tick as a message's arrival, so that its received time was the
158 same as the "first fail" time on the retry record, and that message
159 remained on the queue past the ultimate address timeout, every queue runner
160 would try a delivery (because it was past the ultimate address timeout) but
161 after another failure, the ultimate address timeout, which should have then
162 bounced the address, did not kick in. This was a "< instead of <=" error;
163 in most cases the first failure would have been in the next clock tick
164 after the received time, and all would be well.
166 15. The special items beginning with @ in domain lists (e.g. @mx_any) were not
167 being recognized when the domain list was tested by the match_domain
168 condition in an expansion string.
170 16. Added the ${str2b64: operator.
172 17. Exim was always calling setrlimit() to set a large limit for the number of
173 processes, without checking whether the existing limit was already
174 adequate. (It did check for the limit on file descriptors.) Furthermore,
175 errors from getrlimit() and setrlimit() were being ignored. Now they are
176 logged to the main and panic logs, but Exim does carry on, to try to do its
177 job under whatever limits there are.
179 18. Imported PCRE 5.0.
181 19. Trivial typo in log message " temporarily refused connection" (the leading
184 20. If the log selector return_path_on_delivery was set and an address was
185 redirected to /dev/null, the delivery process crashed because it assumed
186 that a return path would always be set for a "successful" delivery. In this
187 case, the whole delivery is bypassed as an optimization, and therefore no
190 21. Internal re-arrangement: the function for sending a challenge and reading
191 a response while authentication was assuming a zero-terminated challenge
192 string. It's now changed to take a pointer and a length, to allow for
193 binary data in such strings.
195 22. Added the cyrus_sasl authenticator (code supplied by MBM).
197 23. Exim was not respecting finduser_retries when seeking the login of the
198 uid under which it was called; it was always trying 10 times. (The default
199 setting of finduser_retries is zero.) Also, it was sleeping after the final
200 failure, which is pointless.
202 24. Implemented tls_on_connect_ports.
204 25. Implemented acl_smtp_predata.
206 26. If the domain in control=submission is set empty, Exim assumes that the
207 authenticated id is a complete email address when it generates From: or
208 Sender: header lines.
210 27. Added "#define SOCKLEN_T int" to OS/os.h-SCO and OS/os.h-SCO_SV. Also added
211 definitions to OS/Makefile-SCO and OS/Makefile-SCO_SV that put basename,
212 chown and chgrp in /bin and hostname in /usr/bin.
214 28. Exim was keeping the "process log" file open after each use, just as it
215 does for the main log. This opens the possibility of it remaining open for
216 long periods when the USR1 signal hits a daemon. Occasional processlog
217 errors were reported, that could have been caused by this. Anyway, it seems
218 much more sensible not to leave this file open at all, so that is what now
221 29. The long-running daemon process does not normally write to the log once it
222 has entered its main loop, and it closes the log before doing so. This is
223 so that log files can straightforwardly be renamed and moved. However,
224 there are a couple of unusual error situations where the daemon does write
225 log entries, and I had neglected to close the log afterwards.
227 30. The text of an SMTP error response that was received during a remote
228 delivery was being truncated at 512 bytes. This is too short for some of
229 the long messages that one sometimes sees. I've increased the limit to
232 31. It is now possible to make retry rules that apply only when a message has a
233 specific sender, in particular, an empty sender.
235 32. Added "control = enforce_sync" and "control = no_enforce_sync". This makes
236 it possible to be selective about when SMTP synchronization is enforced.
238 33. Added "control = caseful_local_part" and "control = "caselower_local_part".
240 32. Implemented hosts_connection_nolog.
242 33. Added an ACL for QUIT.
244 34. Setting "delay_warning=" to disable warnings was not working; it gave a
247 35. Added mailbox_size and mailbox_filecount to appendfile.
249 36. Added control = no_multiline_responses to ACLs.
251 37. There was a bug in the logic of the code that waits for the clock to tick
252 in the case where the clock went backwards by a substantial amount such
253 that the microsecond fraction of "now" was more than the microsecond
254 fraction of "then" (but the whole seconds number was less).
256 38. Added support for the libradius Radius client library this is found on
257 FreeBSD (previously only the radiusclient library was supported).
263 1. When certain lookups returned multiple values in the form name=value, the
264 quoting of the values was not always being done properly. Specifically:
265 (a) If the value started with a double quote, but contained no whitespace,
267 (b) If the value contained whitespace other than a space character (i.e.
268 tabs or newlines or carriage returns) it was not quoted.
269 This fix has been applied to the mysql and pgsql lookups by writing a
270 separate quoting function and calling it from the lookup code. The fix
271 should probably also be applied to nisplus, ibase and oracle lookups, but
272 since I cannot test any of those, I have not disturbed their existing code.
274 2. A hit in the callout cache for a specific address caused a log line with no
275 reason for rejecting RCPT. Now it says "Previous (cached) callout
276 verification failure".
278 3. There was an off-by-one bug in the queryprogram router. An over-long
279 return line was truncated at 256 instead of 255 characters, thereby
280 overflowing its buffer with the terminating zero. As well as fixing this, I
281 have increased the buffer size to 1024 (and made a note to document this).
283 4. If an interrupt, such as the USR1 signal that is send by exiwhat, arrives
284 when Exim is waiting for an SMTP response from a remote server, Exim
285 restarts its select() call on the socket, thereby resetting its timeout.
286 This is not a problem when such interrupts are rare. Somebody set up a cron
287 job to run exiwhat every 2 minutes, which is less than the normal select()
288 timeout (5 or 10 minutes). This meant that the select() timeout never
289 kicked in because it was always reset. I have fixed this by comparing the
290 time when an interrupt arrives with the time at the start of the first call
291 to select(). If more time than the timeout has elapsed, the interrupt is
292 treated as a timeout.
294 5. Some internal re-factoring in preparation for the addition of Sieve
295 extensions (by MH). In particular, the "personal" test is moved to a
296 separate function, and given an option for scanning Cc: and Bcc: (which is
297 not set for Exim filters).
299 6. When Exim created an email address using the login of the caller as the
300 local part (e.g. when creating a From: or Sender: header line), it was not
301 quoting the local part when it contained special characters such as @.
303 7. Installed new OpenBSD configuration files.
305 8. Reworded some messages for syntax errors in "and" and "or" conditions to
306 try to make them clearer.
308 9. Callout options, other than the timeout value, were being ignored when
309 verifying sender addresses in header lines. For example, when using
311 verify = header_sender/callout=no_cache
313 the cache was (incorrectly) being used.
315 10. Added a missing instance of ${EXE} to the exim_install script; this affects
316 only the Cygwin environment.
318 11. When return_path_on_delivery was set as a log selector, if different remote
319 addresses in the same message used different return paths and parallel
320 remote delivery occurred, the wrong values would sometimes be logged.
321 (Whenever a remote delivery process finished, the return path value from
322 the most recently started remote delivery process was logged.)
324 12. RFC 3848 specifies standard names for the "with" phrase in Received: header
325 lines when AUTH and/or TLS are in use. This is the "received protocol"
326 field. Exim used to use "asmtp" for authenticated SMTP, without any
327 indication (in the protocol name) for TLS use. Now it follows the RFC and
328 uses "esmtpa" if the connection is authenticated, "esmtps" if it is
329 encrypted, and "esmtpsa" if it is both encrypted and authenticated. These
330 names appear in log lines as well as in Received: header lines.
332 13. Installed MH's patches for Sieve to add the "copy" and "vacation"
333 extensions, and comparison tests, and to fix some bugs.
335 14. Changes to the "personal" filter test:
337 (1) The test was buggy in that it was just doing the equivalent of
338 "contains" tests on header lines. For example, if a user's address was
339 anne@some.where, the "personal" test would incorrectly be true for
341 To: susanne@some.where
343 This test is now done by extracting each address from the header in turn,
344 and checking the entire address. Other tests that are part of "personal"
345 are now done using regular expressions (for example, to check local parts
346 of addresses in From: header lines).
348 (2) The list of non-personal local parts in From: addresses has been
349 extended to include "listserv", "majordomo", "*-request", and "owner-*",
350 taken from the Sieve specification recommendations.
352 (3) If the message contains any header line starting with "List-" it is
353 treated as non-personal.
355 (4) The test for "circular" in the Subject: header line has been removed
356 because it now seems ill-conceived.
358 15. Minor typos in src/EDITME comments corrected.
360 16. Installed latest exipick from John Jetmore.
362 17. If headers_add on a router specified a text string that was too long for
363 string_sprintf() - that is, longer than 8192 bytes - Exim panicked. The use
364 of string_sprintf() is now avoided.
366 18. $message_body_size was not set (it was always zero) when running the DATA
367 ACL and the local_scan() function.
369 19. For the "mail" command in an Exim filter, no default was being set for
370 the once_repeat time, causing a random time value to be used if "once" was
371 specified. (If the value happened to be <= 0, no repeat happened.) The
372 default is now 0s, meaning "never repeat". The "vacation" command was OK
373 (its default is 7d). It's somewhat surprising nobody ever noticed this bug
374 (I found it when inspecting the code).
376 20. There is now an overall timeout for performing a callout verification. It
377 defaults to 4 times the callout timeout, which applies to individual SMTP
378 commands during the callout. The overall timeout applies when there is more
379 than one host that can be tried. The timeout is checked before trying the
380 next host. This prevents very long delays if there are a large number of
381 hosts and all are timing out (e.g. when the network connections are timing
382 out). The value of the overall timeout can be changed by specifying an
383 additional sub-option for "callout", called "maxwait". For example:
385 verify = sender/callout=5s,maxwait=20s
387 21. Add O_APPEND to the open() call for maildirsize files (Exim already seeks
388 to the end before writing, but this should make it even safer).
390 22. Exim was forgetting that it had advertised PIPELINING for the second and
391 subsequent messages on an SMTP connection. It was also not resetting its
392 memory on STARTTLS and an internal HELO.
394 23. When Exim logs an SMTP synchronization error within a session, it now
395 records whether PIPELINING has been advertised or not.
397 24. Added 3 instances of "(long int)" casts to time_t variables that were being
398 formatted using %ld, because on OpenBSD (and perhaps others), time_t is int
399 rather than long int.
401 25. Installed the latest Cygwin configuration files from the Cygwin maintainer.
403 26. Added the never_mail option to autoreply.
409 1. A reorganization of the code in order to implement 4.40/8 caused a daemon
410 crash if the getsockname() call failed; this can happen if a connection is
411 closed very soon after it is established. The problem was simply in the
412 order in which certain operations were done, causing Exim to try to write
413 to the SMTP stream before it had set up the file descriptor. The bug has
414 been fixed by making things happen in the correct order.
420 1. If "drop" was used in a DATA ACL, the SMTP output buffer was not flushed
421 before the connection was closed, thus losing the rejection response.
423 2. Commented out the definition of SOCKLEN_T in os.h-SunOS5. It is needed for
424 some early Solaris releases, but causes trouble in current releases where
425 socklen_t is defined.
427 3. When std{in,out,err} are closed, re-open them to /dev/null so that they
430 4. Minor refactoring of os.c-Linux to avoid compiler warning when IPv6 is not
433 5. Refactoring in expand.c to improve memory usage. Pre-allocate a block so
434 that releasing the top of it at the end releases what was used for sub-
435 expansions (unless the block got too big). However, discard this block if
436 the first thing is a variable or header, so that we can use its block when
437 it is dynamic (useful for very large $message_headers, for example).
439 6. Lookups now cache *every* query, not just the most recent. A new, separate
440 store pool is used for this. It can be recovered when all lookup caches are
441 flushed. Lookups now release memory at the end of their result strings.
442 This has involved some general refactoring of the lookup sources.
444 7. Some code has been added to the store_xxx() functions to reduce the amount
445 of flapping under certain conditions.
447 8. log_incoming_interface used to affect only the <= reception log lines. Now
448 it causes the local interface and port to be added to several more SMTP log
449 lines, for example "SMTP connection from", and rejection lines.
451 9. The Sieve author supplied some patches for the doc/README.SIEVE file.
453 10. Added a conditional definition of _BSD_SOCKLEN_T to os.h-Darwin.
455 11. If $host_data was set by virtue of a hosts lookup in an ACL, its value
456 could be overwritten at the end of the current message (or the start of a
457 new message if it was set in a HELO ACL). The value is now preserved for
458 the duration of the SMTP connection.
460 12. If a transport had a headers_rewrite setting, and a matching header line
461 contained an unqualified address, that address was qualified, even if it
462 did not match any rewriting rules. The underlying bug was that the values
463 of the flags that permit the existence of unqualified sender and recipient
464 addresses in header lines (set by {sender,recipient}_unqualified_hosts for
465 non-local messages, and by -bnq for local messages) were not being
466 preserved with the message after it was received.
468 13. When Exim was logging an SMTP synchronization error, it could sometimes log
469 "next input=" as part of the text comprising the host identity instead of
470 the correct text. The code was using the same buffer for two different
471 strings. However, depending on which order the printing function evaluated
472 its arguments, the bug did not always show up. Under Linux, for example, my
473 test suite worked just fine.
475 14. Exigrep contained a use of Perl's "our" scoping after change 4.31/70. This
476 doesn't work with some older versions of Perl. It has been changed to "my",
477 which in any case is probably the better facility to use.
479 15. A really picky compiler found some instances of statements for creating
480 error messages that either had too many or two few arguments for the format
483 16. The size of the buffer for calls to the DNS resolver has been increased
484 from 1024 to 2048. A larger buffer is needed when performing PTR lookups
485 for addresses that have a lot of PTR records. This alleviates a problem; it
486 does not fully solve it.
488 17. A dnsdb lookup for PTR records that receives more data than will fit in the
489 buffer now truncates the list and logs the incident, which is the same
490 action as happens when Exim is looking up a host name and its aliases.
491 Previously in this situation something unpredictable would happen;
492 sometimes it was "internal error: store_reset failed".
494 18. If a server dropped the connection unexpectedly when an Exim client was
495 using GnuTLS and trying to read a response, the client delivery process
496 crashed while trying to generate an error log message.
498 19. If a "warn" verb in an ACL added multiple headers to a message in a single
501 warn message = H1: something\nH2: something
503 the text was added as a single header line from Exim's point of view
504 though it ended up OK in the delivered message. However, searching for the
505 second and subsequent header lines using $h_h2: did not work. This has been
506 fixed. Similarly, if a system filter added multiple headers in this way,
507 the routers could not see them.
509 20. Expanded the error message when iplsearch is called with an invalid key to
510 suggest using net-iplsearch in a host list.
512 21. When running tests using -bh, any delays imposed by "delay" modifiers in
513 ACLs are no longer actually imposed (and a message to that effect is
516 22. If a "gecos" field in a passwd entry contained escaped characters, in
517 particular, if it contained a \" sequence, Exim got it wrong when building
518 a From: or a Sender: header from that name. A second bug also caused
519 incorrect handling when an unquoted " was present following a character
522 23. "{crypt}" as a password encryption mechanism for a "crypteq" expansion item
523 was not being matched caselessly.
525 24. Arranged for all hyphens in the exim.8 source to be escaped with
528 25. Change 16 of 4.32, which reversed 71 or 4.31 didn't quite do the job
529 properly. Recipient callout cache records were still being keyed to include
530 the sender, even when use_sender was set false. This led to far more
531 callouts that were necessary. The sender is no longer included in the key
532 when use_sender is false.
534 26. Added "control = submission" modifier to ACLs.
536 27. Added the ${base62d: operator to decode base 62 numbers.
538 28. dnsdb lookups can now access SRV records.
540 29. CONFIGURE_OWNER can be set at build time to define an alternative owner for
541 the configuration file.
543 30. The debug message "delivering xxxxxx-xxxxxx-xx" is now output in verbose
544 (-v) mode. This makes the output for a verbose queue run more intelligible.
546 31. Added a use_postmaster feature to recipient callouts.
548 32. Added the $body_zerocount variable, containing the number of binary zero
549 bytes in the message body.
551 33. The time of last modification of the "new" subdirectory is now used as the
552 "mailbox time last read" when there is a quota error for a maildir
555 34. Added string comparison operators lt, lti, le, lei, gt, gti, ge, gei.
557 35. Added +ignore_unknown as a special item in host lists.
559 36. Code for decoding IPv6 addresses in host lists is now included, even if
560 IPv6 support is not being compiled. This fixes a bug in which an IPv6
561 address was recognized as an IP address, but was then not correctly decoded
562 into binary, causing unexpected and incorrect effects when compared with
569 1. Very minor rewording of debugging text in manualroute to say "list of
570 hosts" instead of "hostlist".
572 2. If verify=header_syntax was set, and a header line with an unqualified
573 address (no domain) and a large number of spaces between the end of the
574 name and the colon was received, the reception process suffered a buffer
575 overflow, and (when I tested it) crashed. This was caused by some obsolete
576 code that should have been removed. The fix is to remove it!
578 3. When running in the test harness, delay a bit after writing a bounce
579 message to get a bit more predictability in the log output.
581 4. Added a call to search_tidyup() just before forking a reception process. In
582 theory, someone could use a lookup in the expansion of smtp_accept_max_
583 per_host which, without the tidyup, could leave open a database connection.
585 5. Added the variables $recipient_data and $sender_data which get set from a
586 lookup success in an ACL "recipients" or "senders" condition, or a router
587 "senders" option, similar to $domain_data and $local_part_data.
589 6. Moved the writing of debug_print from before to after the "senders" test
592 7. Change 4.31/66 (moving the time when the Received: is generated) caused
593 problems for message scanning, either using a data ACL, or using
594 local_scan() because the Received: header was not generated till after they
595 were called (in order to set the time as the time of reception completion).
596 I have revised the way this works. The header is now generated after the
597 body is received, but before the ACL or local_scan() are called. After they
598 are run, the timestamp in the header is updated.
604 1. Change 4.24/6 introduced a bug because the SIGALRM handler was disabled
605 before starting a queue runner without re-exec. This happened only when
606 deliver_drop_privilege was set or when the Exim user was set to root. The
607 effect of the bug was that timeouts during subsequent deliveries caused
608 crashes instead of being properly handled. The handler is now left at its
609 default (and expected) setting.
611 2. The other case in which a daemon avoids a re-exec is to deliver an incoming
612 message, again when deliver_drop_privilege is set or Exim is run as root.
613 The bug described in (1) was not present in this case, but the tidying up
614 of the other signals was missing. I have made the two cases consistent.
616 3. The ignore_target_hosts setting on a manualroute router was being ignored
617 for hosts that were looked up using the /MX notation.
619 4. Added /ignore=<ip list> feature to @mx_any, @mx_primary, and @mx_secondary
622 5. Change 4.31/55 was buggy, and broke when there was a rewriting rule that
623 operated on the sender address. After changing the $sender_address to <>
624 for the sender address verify, Exim was re-instated it as the original
625 (before rewriting) address, but remembering that it had rewritten it, so it
626 wasn't rewriting it again. This bug also had the effect of breaking the
627 sender address verification caching when the sender address was rewritten.
629 6. The ignore_target_hosts option was being ignored by the ipliteral router.
630 This has been changed so that if the ip literal address matches
631 ignore_target_hosts, the router declines.
633 7. Added expansion conditions match_domain, match_address, and match_local_
634 part (NOT match_host).
636 8. The placeholder for the Received: header didn't have a length field set.
638 9. Added code to Exim itself and to exim_lock to test for a specific race
639 condition that could lead to file corruption when using MBX delivery. The
640 issue is with the lockfile that is created in /tmp. If this file is removed
641 after a process has opened it but before that process has acquired a lock,
642 there is the potential for a second process to recreate the file and also
643 acquire a lock. This could lead to two Exim processes writing to the file
644 at the same time. The added code performs the same test as UW imapd; it
645 checks after acquiring the lock that its file descriptor still refers to
648 10. The buffer for building added header lines was of fixed size, 8192 bytes.
649 It is now parameterized by HEADER_ADD_BUFFER_SIZE and this can be adjusted
652 11. Added the smtp_active_hostname option. If used, this will typically be made
653 to depend on the incoming interface address. Because $interface_address is
654 not set up until the daemon has forked a reception process, error responses
655 that can happen earlier (such as "too many connections") no longer contain
658 12. If an expansion in a condition on a "warn" statement fails because a lookup
659 defers, the "warn" statement is abandoned, and the next ACL statement is
660 processed. Previously this caused the whole ACL to be aborted.
662 13. Added the iplsearch lookup type.
664 14. Added ident_timeout as a log selector.
666 15. Added tls_certificate_verified as a log selector.
668 16. Added a global option tls_require_ciphers (compare the smtp transport
669 option of the same name). This controls incoming TLS connections.
671 17. I finally figured out how to make tls_require_ciphers do a similar thing
672 in GNUtls to what it does in OpenSSL, that is, set up an appropriate list
673 before starting the TLS session.
675 18. Tabs are now shown as \t in -bP output.
677 19. If the log selector return_path_on_delivery was set, Exim crashed when
678 bouncing a message because it had too many Received: header lines.
680 20. If two routers both had headers_remove settings, and the first one included
681 a superfluous trailing colon, the final name in the first list and the
682 first name in the second list were incorrectly joined into one item (with a
683 colon in the middle).
689 1. Added -C and -D options to the exinext utility, mainly to make it easier
690 to include in the automated testing, but these could be helpful when
691 multiple configurations are in use.
693 2. The exinext utility was not formatting the output nicely when there was
694 an alternate port involved in the retry record key, nor when there was a
695 message id as well (for retries that were specific to a specific message
696 and a specific host). It was also confused by IPv6 addresses, because of
697 the additional colons they contain. I have fixed the IPv4 problem, and
698 patched it up to do a reasonable job for IPv6.
700 3. When there is an error after a MAIL, RCPT, or DATA SMTP command during
701 delivery, the log line now contains "pipelined" if PIPELINING was used.
703 4. An SMTP transport process used to panic and die if the bind() call to set
704 an explicit outgoing interface failed. This has been changed; it is now
705 treated in the same way as a connect() failure.
707 5. A reference to $sender_host_name in the part of a conditional expansion
708 that was being skipped was still causing a DNS lookup. This no longer
711 6. The def: expansion condition was not recognizing references to header lines
712 that used bh_ and bheader_.
714 7. Added the _cache feature to named lists.
716 8. The code for checking quota_filecount in the appendfile transport was
717 allowing one more file than it should have been.
719 9. For compatibility with Sendmail, the command line option
727 and sets the incoming protocol and host name (for trusted callers). The
728 host name and its colon can be omitted when only the protocol is to be set.
729 Note the Exim already has two private options, -pd and -ps, that refer to
730 embedded Perl. It is therefore impossible to set a protocol value of "d" or
731 "s", but I don't think that's a major issue.
733 10. A number of refactoring changes to the code, none of which should affect
736 (a) The number of logging options was getting close to filling up the
737 32-bit word that was used as a bit map. I have split them into two classes:
738 those that are passed in the argument to log_write(), and those that are
739 only ever tested independently outside of that function. These are now in
740 separate 32-bit words, so there is plenty of room for expansion again.
741 There is no change in the user interface or the logging behaviour.
743 (b) When building, for example, log lines, the code previously used a
744 macro that called string_cat() twice, in order to add two strings. This is
745 not really sufficiently general. Furthermore, there was one instance where
746 it was actually wrong because one of the argument was used twice, and in
747 one call a function was used. (As it happened, calling the function twice
748 did not affect the overall behaviour.) The macro has been replaced by a
749 function that can join an arbitrary number of extra strings onto a growing
752 (c) The code for expansion conditions now uses a table and a binary chop
753 instead of a serial search (which was left over from when there were very
754 few conditions). Also, it now recognizes conditions like "pam" even when
755 the relevant support is not compiled in: a suitably worded error message is
756 given if an attempt is made to use such a condition.
758 11. Added ${time_interval:xxxxx}.
760 12. A bug was causing one of the ddress fields not to be passed back correctly
761 from remote delivery subprocesses. The field in question was not being
762 subsequently used, so this caused to problems in practice.
764 13. Added new log selectors queue_time and deliver_time.
766 14. Might have fixed a bug in maildirsizefile handling that threw up
767 "unexpected character" debug warnings, and recalculated the data
768 unnecessarily. In any case, I expanded the warning message to give more
771 15. Added the message "Restricted characters in address" to the statements in
772 the default ACL that block characters like @ and % in local parts.
774 16. Change 71 for release 4.31 proved to be much less benign that I imagined.
775 Three changes have been made:
777 (a) There was a serious bug; a negative response to MAIL caused the whole
778 recipient domain to be cached as invalid, thereby blocking all messages
779 to all local parts at the same domain, from all senders. This bug has
780 been fixed. The domain is no longer cached after a negative response to
781 MAIL if the sender used is not empty.
783 (b) The default behaviour of using MAIL FROM:<> for recipient callouts has
786 (c) A new callout option, "use_sender" has been added for people who want
787 the modified behaviour.
793 1. Removed "EXTRALIBS=-lwrap" from OS/Makefile-Unixware7 on the advice of
796 2. Removed "LIBS = -lresolv" from OS/Makefile-Darwin as it is not needed, and
797 indeed breaks things for older releases.
799 3. Added additional logging to the case where there is a problem reading data
800 from a filter that is running in a subprocess using a pipe, in order to
801 try to track down a specific problem.
803 4. Testing facility fudge: when running in the test harness and attempting
804 to connect to 10.x.x.x (expecting a connection timeout) I'm now sometimes
805 getting "No route to host". Convert this to a timeout.
807 5. Define ICONV_ARG2_TYPE as "char **" for Unixware7 to avoid compiler
810 6. Some OS don't have socklen_t but use size_t instead. This affects the
811 fifth argument of getsockopt() amongst other things. This is now
812 configurable by a macro called SOCKLEN_T which defaults to socklen_t, but
813 can be set for individual OS. I have set it for SunOS5, OSF1, and
814 Unixware7. Current versions of SunOS5 (aka Solaris) do have socklen_t, but
815 some earlier ones do not.
817 7. Change 4.30/15 was not doing the test caselessly.
819 8. The standard form for an IPv6 address literal was being rejected by address
820 parsing in, for example, MAIL and RCPT commands. An example of this kind of
821 address is [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
822 this, as well as the form without the "IPv6" on the front (but only when
823 address literals are enabled, of course).
825 9. Added some casts to avoid compiler warnings in OS/os.c-Linux.
827 10. Exim crashed if a message with an empty sender address specified by -f
828 encountered a router with an errors_to setting. This could be provoked only
833 where an empty string was supplied; "<>" did not hit this bug.
835 11. Installed PCRE release 4.5.
837 12. If EHLO/HELO was rejected by an ACL, the value of $sender_helo_name
838 remained set. It is now erased.
840 13. exiqgrep wasn't working on MacOS X because it didn't correctly compute
841 times from message ids (which are base 36 rather than the normal 62).
843 14. "Expected" SMTP protocol errors that can arise when PIPELINING is in use
844 were being counted as actual protocol errors, and logged if the log
845 selector +smtp_protocol_error was set. One cannot be perfect in this test,
846 but now, if PIPELINING has been advertised, RCPT following a rejected MAIL,
847 and DATA following a set of rejected RCPTs do not count as protocol errors.
848 In other words, Exim assumes they were pipelined, though this may not
849 actually be the case. Of course, in all cases the client gets an
850 appropriate error code.
852 15. If a lookup fails in an ACL condition, a message about the failure may
853 be available; it is used if testing the ACL cannot continue, because most
854 such messages specify what the cause of the deferral is. However, some
855 messages (e.g. "MYSQL: no data found") do not cause a defer. There was bug
856 that caused an old message to be retained and used if a later statement
857 caused a defer, replacing the real cause of the deferral.
859 16. If an IP address had so many PTR records that the DNS lookup buffer
860 was not large enough to hold them, Exim could crash while trying to process
861 the truncated data. It now detects and logs this case.
863 17. Further to 4.21/58, another change has been made: if (and only if) the
864 first line of a message (the first header line) ends with CRLF, a bare LF
865 in a subsequent header line has a space inserted after it, so as not to
866 terminate the header.
868 18. Refactoring: tidied an ugly bit of code in appendfile that copied data
869 unnecessarily, used atoi() instead of strtol(), and didn't check the
870 termination when getting file sizes from file names by regex.
872 19. Completely re-implemented the support for maildirsize files, in the light
873 of a number of problems with the previous contributed implementation
874 (4.30/29). In particular:
876 . If the quota is zero, the maildirsize file is maintained, but no quota is
879 . If the maildir directory does not exist, it is created before any attempt
880 to write a maildirsize file.
882 . The quota value in the file is just a cache; if the quota is changed in
883 the transport, the new value overrides.
885 . A regular expression is available for excluding directories from the
888 20. The autoreply transport checks the characters in options that define the
889 message's headers; it allows continued headers, but it was checking with
890 isspace() after an embedded newline instead of explicitly looking for a
893 21. If all the "regular" hosts to which an address was routed had passed their
894 expiry times, and had not reached their retry times, the address was
895 bounced, even if fallback hosts were defined. Now Exim should go on to try
898 22. Increased buffer sizes in the callout code from 1024 to 4096 to match the
899 equivalent code in the SMTP transport. Some hosts send humungous responses
900 to HELO/EHLO, more than 1024 it seems.
902 23. Refactoring: code in filter.c used (void *) for "any old type" but this
903 gives compiler warnings in some environments. I've now done it "properly",
906 24. The replacement for inet_ntoa() that is used with gcc on IRIX systems
907 (because of problems with the built-in one) was declared to return uschar *
908 instead of char *, causing compiler failure.
910 25. Fixed a file descriptor leak when processing alias/forward files.
912 26. Fixed a minor format string issue in dbfn.c.
914 27. Typo in exim.c: ("dmbnz" for "dbmnz").
916 28. If a filter file refered to $h_xxx or $message_headers, and the headers
917 contained RFC 2047 "words", Exim's memory could, under certain conditions,
920 29. When a sender address is verified, it is cached, to save repeating the test
921 when there is more than one recipient in a message. However, when the
922 verification involves a callout, it is possible for different callout
923 options to be set for different recipients. It is too complicated to keep
924 track of this in the cache, so now Exim always runs a verification when a
925 callout is required, relying on the callout cache for the optimization.
926 The overhead is duplication of the address routing, but this should not be
929 30. Fixed a bug in callout caching. If a RCPT command caused the sender address
930 to be verified with callout=postmaster, and the main callout worked but the
931 postmaster check failed, the verification correctly failed. However, if a
932 subsequent RCPT command asked for sender verification *without* the
933 postmaster check, incorrect caching caused this verification also to fail,
936 31. Exim caches DNS lookup failures so as to avoid multiple timeouts; however,
937 it was not caching the DNS options (qualify_single, search_parents) that
938 were used when the lookup failed. A subsequent lookup with different
939 options therefore always gave the same answer, though there were cases
940 where it should not have. (Example: a "domains = !$mx_any" option on a
941 dnslookup router: the "domains" option is always processed without any
942 widening, but the router might have qualify_single set.) Now Exim uses the
943 cached value only when the same options are set.
945 32. Added John Jetmore's "exipick" utility to the distribution.
947 33. GnuTLS: When an attempt to start a TLS session fails for any reason other
948 than a timeout (e.g. a certificate is required, and is not provided), an
949 Exim server now closes the connection immediately. Previously it waited for
950 the client to close - but if the client is SSL, it seems that they each
951 wait for each other, leading to a delay before one of them times out.
953 34: GnuTLS: Updated the code to use the new GnuTLS 1.0.0 API. I have not
954 maintained 0.8.x compatibility because I don't think many are using it, and
955 it is clearly obsolete.
957 35. Added TLS support for CRLs: a tls_crl global option and one for the smtp
960 36. OpenSSL: $tls_certificate_verified was being set to 1 even if the
961 client certificate was expired. A simple patch fixes this, though I don't
962 understand the full logic of why the verify callback is called multiple
965 37. OpenSSL: a patch from Robert Roselius: "Enable client-bug workaround.
966 Versions of OpenSSL as of 0.9.6d include a 'CBC countermeasure' feature,
967 which causes problems with some clients (such as the Certicom SSL Plus
968 library used by Eudora). This option, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS,
969 disables the coutermeasure allowing Eudora to connect."
971 38. Exim was not checking that a write() to a log file succeeded. This could
972 lead to Bad Things if a log got too big, in particular if it hit a file
973 size limit. Exim now panics and dies if it cannot write to a log file, just
974 as it does if it cannot open a log file.
976 39. Modified OS/Makefile-Linux so that it now contains
978 CFLAGS=-O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
980 The two -D definitions ensure that Exim is compiled with large file
981 support, which makes it possible to handle log files that are bigger than
984 40. Fixed a subtle caching bug: if (in an ACL or a set of routers, for
985 instance) a domain was checked against a named list that involved a lookup,
986 causing $domain_data to be set, then another domain was checked against the
987 same list, then the first domain was re-checked, the value of $domain_data
988 after the final check could be wrong. In particular, if the second check
989 failed, it could be set empty. This bug probably also applied to
992 41. The strip_trailing_dot option was not being applied to the address given
993 with the -f command-line option.
995 42. The code for reading a message's header from the spool was incrementing
996 $received_count, but never initializing it. This meant that the value was
997 incorrect (doubled) while delivering a message in the same process in which
998 it was received. In the most common configuration of Exim, this never
999 happens - a fresh exec is done - but it can happen when
1000 deliver_drop_privilege is set.
1002 43. When Exim logs an SMTP synchronization error - client data sent too soon -
1003 it now includes up to 150 characters of the unexpected data in the log
1006 44. The exim_dbmbuild utility uses fixed size buffers for reading input lines
1007 and building data strings. The size of both of these buffers was 10 000
1008 bytes - far larger than anybody would *ever* want, thought I. Needless to
1009 say, somebody hit the limit. I have increased the maximum line length to
1010 20 000 and the maximum data length of concatenated lines to 100 000. I have
1011 also fixed two bugs, because there was no checking on these buffers. Tsk,
1012 tsk. Now exim_dbmbuild gives a message and exits with an error code if a
1013 buffer is too small.
1015 45. The exim_dbmbuild utility did not support quoted keys, as Exim does in
1016 lsearch lookups. Now it does.
1018 46. When parsing a route_list item in a manualroute router, a fixed-length
1019 buffer was used for the list of hosts. I made this 1024 bytes long,
1020 thinking that nobody would ever have a list of hosts that long. Wrong.
1021 Somebody had a whole pile of complicated expansion conditions, and the
1022 string was silently truncated, leading to an expansion error. It turns out
1023 that it is easier to change to an unlimited length (owing to other changes
1024 that have happened since this code was originally written) than to build
1025 structure for giving a limitation error. The length of the item that
1026 expands into the list of hosts is now unlimited.
1028 47. The lsearch lookup could not handle data where the length of text line was
1029 more than 4095 characters. Such lines were truncated, leading to shortened
1030 data being returned. It should now handle lines of any length.
1032 48. Minor wording revision: "cannot test xxx in yyy ACL" becomes "cannot test
1033 xxx condition in yyy ACL" (e.g. "cannot test domains condition in DATA
1036 49. Cosmetic tidy to scripts like exicyclog that are generated by globally
1037 replacing strings such as BIN_DIRECTORY in a source file: the replacement
1038 no longer happens in comment lines. A list of replacements is now placed
1039 at the head of all of the source files, except those whose only change is
1040 to replace PERL_COMMAND in the very first #! line.
1042 50. Replaced the slow insertion sort in queue.c, for sorting the list of
1043 messages on the queue, with a bottom-up merge sort, using code contributed
1044 by Michael Haardt. This should make operations like -bp somewhat faster on
1045 large queues. It won't affect queue runners, except when queue_run_in_order
1048 51. Installed eximstats 1.31 in the distribution.
1050 52. Added support for SRV lookups to the dnslookup router.
1052 53. If an ACL referred to $message_body or $message_body_end, the value was not
1053 reset for any messages that followed in the same SMTP session.
1055 54. The store-handling optimization for building very long strings was not
1056 differentiating between the different store pools. I don't think this
1057 actually made any difference in practice, but I've tidied it.
1059 55. While running the routers to verify a sender address, $sender_address
1060 was still set to the sender address. This is wrong, because when routing to
1061 send a bounce to the sender, it would be empty. Therefore, I have changed
1062 it so that, while verifying a sender address, $sender_address is set to <>.
1063 (There is no change to what happens when verifying a recipient address.)
1065 56. After finding MX (or SRV) records, Exim was doing a DNS lookup for the
1066 target A or AAAA records (if not already returned) without resetting the
1067 qualify_single or search_parents options of the DNS resolver. These are
1068 inappropriate in this case because the targets of MX and SRV records must
1069 be FQDNs. A broken DNS record could cause trouble if it happened to have a
1070 target that, when qualified, matched something in the local domain. These
1071 two options are now turned off when doing these lookups.
1073 57. It seems that at least some releases of Reiserfs (which does not have the
1074 concept of a fixed number of inodes) returns zero and not -1 for the
1075 number of available inodes. This interacted badly with check_spool_inodes,
1076 which assumed that -1 was the "no such thing" setting. What I have done is
1077 to check that the total number of inodes is greater than zero before doing
1078 the test of how many are available.
1080 58. When a "warn" ACL statement has a log_message modifier, the message is
1081 remembered, and not repeated. This is to avoid a lot of repetition when a
1082 message has many recipients that cause the same warning to be written.
1083 Howewer, Exim was preserving the list of already written lines for an
1084 entire SMTP session, which doesn't seem right. The memory is now reset if a
1085 new message is started.
1087 59. The "rewrite" debugging flag was not showing the result of rewriting in the
1088 debugging output unless log_rewrite was also set.
1090 60. Avoid a compiler warning on 64-bit systems in dsearch.c by avoiding the use
1091 of (int)(handle) when we know that handle contains (void *)(-1).
1093 61. The Exim daemon panic-logs an error return when it closes the incoming
1094 connection. However "connection reset by peer" seems to be common, and
1095 isn't really an error worthy of noting specially, so that particular error
1098 62. When Exim is trying to find all the local interfaces, it used to panic and
1099 die if the ioctl to get the interface flags failed. However, it seems that
1100 on at least one OS (Solaris 9) it is possible to have an interface that is
1101 included in the list of interfaces, but for which you get a failure error
1102 for this call. This happens when the interface is not "plumbed" into a
1103 protocol (i.e. neither IPv4 nor IPv6). I've changed the code so that a
1104 failure of the "get flags" call assumes that the interface is down.
1106 63. Added a ${eval10: operator, which assumes all numbers are decimal. This
1107 makes life easier for people who are doing arithmetic on fields extracted
1108 from dates, where you often get leading zeros that should not be
1109 interpreted as octal.
1111 64. Added qualify_domain to the redirect router, to override the global
1114 65. If a pathologically long header line contained very many addresses (the
1115 report of this problem mentioned 10 000) and each of them was rewritten,
1116 Exim could use up a very large amount of memory. (It kept on making new
1117 copies of the header line as it rewrote, and never released the old ones.)
1118 At the expense of a bit more processing, the header rewriting function has
1119 been changed so that it no longer eats memory in this way.
1121 66. The generation of the Received: header has been moved from the time that a
1122 message starts to be received, to the time that it finishes. The timestamp
1123 in the Received: header should now be very close to that of the <= log
1124 line. There are two side-effects of this change:
1126 (a) If a message is rejected by a DATA or non-SMTP ACL or local_scan(), the
1127 logged header lines no longer include the local Received: line, because
1128 it has not yet been created. The same applies to a copy of the message
1129 that is returned to a non-SMTP sender when a message is rejected.
1131 (b) When a filter file is tested using -bf, no additional Received: header
1132 is added to the test message. After some thought, I decided that this
1135 This change does not affect the value of $received_for. It is still set
1136 after address rewriting, but before local_scan() is called.
1138 67. Installed the latest Cygwin-specific files from the Cygwin maintainer.
1140 68. GnuTLS: If an empty file is specified for tls_verify_certificates, GnuTLS
1141 gave an unhelpful panic error message, and a defer error. I have managed to
1142 change this behaviour so that it now rejects any supplied certificate,
1143 which seems right, as the list of acceptable certificates is empty.
1145 69. OpenSSL: If an empty file is specified for tls_verify_certificates, OpenSSL
1146 gave an unhelpful defer error. I have not managed to make this reject any
1147 supplied certificates, but the error message it gives is "no certificate
1148 supplied", which is not helpful.
1150 70. exigrep's output now also includes lines that are not associated with any
1151 message, but which match the given pattern. Implemented by a patch from
1152 Martin Sluka, which also tidied up the Perl a bit.
1154 71. Recipient callout verification, like sender verification, was using <> in
1155 the MAIL FROM command. This isn't really the right thing, since the actual
1156 sender may affect whether the remote host accepts the recipient or not. I
1157 have changed it to use the actual sender in the callout; this means that
1158 the cache record is now keyed on a recipient/sender pair, not just the
1159 recipient address. There doesn't seem to be a real danger of callout loops,
1160 since a callout by the remote host to check the sender would use <>.
1161 [SEE ABOVE: changed after hitting problems.]
1163 72. Exim treats illegal SMTP error codes that do not begin with 4 or 5 as
1164 temporary errors. However, in the case of such a code being given after
1165 the end of a data transmission (i.e. after ".") Exim was failing to write
1166 a retry record for the message. (Yes, there was some broken host that was
1167 actually sending 8xx at this point.)
1169 73. An unknown lookup type in a host list could cause Exim to panic-die when
1170 the list was checked. (An example that provoked this was putting <; in the
1171 middle of a list instead of at the start.) If this happened during a DATA
1172 ACL check, a -D file could be left lying around. This kind of configuration
1173 error no longer causes Exim to die; instead it causes a defer errror. The
1174 incident is still logged to the main and panic logs.
1176 74. Buglet left over from Exim 3 conversion. The message "too many messages
1177 in one connection" was written to the rejectlog but not the mainlog, except
1178 when address rewriting (yes!) was being logged.
1180 75. Added write_rejectlog option.
1182 76. When a system filter was run not as root (that is, when system_filter_user
1183 was set), the values of the $n variables were not being returned to the
1184 main process; thus, they were not subsequently available in the $sn
1187 77. Added +return_path_on_delivery log selector.
1189 78. A connection timeout was being treated differently from recipients deferred
1190 when testing hosts_max_try with a message that was older than the host's
1191 retry timeout. (The host should not be counted, thus allowing all hosts to
1192 be tried at least once before bouncing.) This may have been the cause of an
1193 occasionally reported bug whereby a message would remain on the queue
1194 longer than the retry timeout, but would be bounced if a delivery was
1195 forced. I say "may" because I never totally pinned down the problem;
1196 setting up timeout/retry tests is difficult. See also the next item.
1198 79. The ultimate address timeout was not being applied to errors that involved
1199 a combination of host plus message (for example, a timeout on a MAIL
1200 command). When an address resolved to a number of possible hosts, and they
1201 were not all tried for each delivery (e.g. because of hosts_max_try), a
1202 message could remain on the queue longer than the retry timeout.
1204 80. Sieve bug: "stop" inside "elsif" was broken. Applied a patch from Michael
1207 81. Fixed an obscure SMTP outgoing bug which required at least the following
1208 conditions: (a) there was another message waiting for the same server;
1209 (b) the server returned 5xx to all RCPT commands in the first message so
1210 that the message was not completed; (c) the server dropped the connection
1211 or gave a negative response to the RSET that Exim sends to abort the
1212 transaction. The observed case was a dropped connection after DATA that had
1213 been sent in pipelining mode. That is, the server had advertised PIPELINING
1214 but was not implementing it correctly. The effect of the bug was incorrect
1215 behaviour, such as trying another host, and this could lead to a crash.
1221 1. The 3rd arguments to getsockname(), getpeername(), and accept() in exim.c
1222 and daemon.c were passed as pointers to ints; they should have been
1223 pointers to socklen_t variables (which are typically unsigned ints).
1225 2. Some signed/unsigned type warnings in the os.c file for Linux have been
1228 3. Fixed a really odd bug that affected only the testing scheme; patching a
1229 certain fixed string in the binary changed the value of another string that
1230 happened to be identical to the end of the original first string.
1232 4. When gethostbyname() (or equivalent) is passed an IP address as a "host
1233 name", it returns that address as the IP address. On some operating
1234 systems (e.g. Solaris), it also passes back the IP address string as the
1235 "host name". However, on others (e.g. Linux), it passes back an empty
1236 string. Exim wasn't checking for this, and was changing the host name to an
1237 empty string, assuming it had been canonicized.
1239 5. Although rare, it is permitted to have more than one PTR record for a given
1240 IP address. I thought that gethostbyaddr() or getipnodebyaddr() always gave
1241 all the names associated with an address, because they do in Solaris.
1242 However, it seems that they do not in Linux for data that comes from the
1243 DNS. If an address in /etc/hosts has multiple names, they _are_ all given.
1244 I found this out when I moved to a new Linux workstation and tried to run
1245 the Exim test suite.
1247 To get round this problem I have changed the code so that it now does its
1248 own call to the DNS to look up PTR records when searching for a host name.
1249 If nothing can be found in the DNS, it tries gethostbyaddr(), so that
1250 addresses that are only in /etc/hosts are still found.
1252 This behaviour is, however, controlled by an option called host_lookup_
1253 order, which defaults to "bydns:byaddr". If people want to use the other
1254 order, or indeed, just use one or the other means of lookup, they can
1255 specify it in this variable.
1257 6. If a PTR record yields an empty name, Exim treats it as non-existent. In
1258 some operating systems, this comes back from gethostbyaddr() as an empty
1259 string, and this is what Exim used to test for. However, it seems that in
1260 other systems, "." is yielded. Exim now tests for this case too.
1262 7. The values of check_spool_space and check_log_space are now held internally
1263 as a number of kilobytes instead of an absolute number of bytes. If a
1264 numbers is specified without 'K' or 'M', it is rounded up to the nearest
1265 kilobyte. This means that much larger values can be stored.
1267 8. Exim monitor: an attempt to get the action menu when not actually pointing
1268 at a message produces an empty menu entitled "No message selected". This
1269 works on Solaris (OpenWindows). However, XFree86 does not like a menu with
1270 no entries in it ("Shell widget menu has zero width and/or height"). So I
1271 have added a single, blank menu entry in this case.
1273 9. Added ${quote_local_part.
1275 10. MIME decoding is now applied to the contents of Subject: header lines when
1278 11. Now that a reference to $sender_host_address automatically causes a reverse
1279 lookup to occur if necessary (4.13/18), there is no need to arrange for a
1280 host lookup before query-style lookups in lists that might use this
1281 variable. This has therefore been abolished, and the "net-" prefix is no
1282 longer necessary for query-style lookups.
1284 12. The Makefile for SCO_SV contained a setting of LDFLAGS. This appears to
1285 have been a typo for LFLAGS, so it has been changed.
1287 13. The install script calls Exim with "-C /dev/null" in order to find the
1288 version number. If ALT_CONFIG_PREFIX was set, this caused an error message
1289 to be output. Howeve, since Exim outputs its version number before the
1290 error, it didn't break the script. It just looked ugly. I fixed this by
1291 always allowing "-C /dev/null" if the caller is root.
1293 14. Ignore overlarge ACL variable number when reading spool file - insurance
1294 against a later release with more variables having written the file.
1296 15. The standard form for an IPv6 address literal was being rejected by EHLO.
1297 Example: [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
1298 this, as well as the form without the "IPv6" on the front.
1300 16. Added CHOWN_COMMAND=/usr/sbin/chown and LIBS=-lresolv to the
1301 OS/Makefile-Darwin file.
1303 17. Fixed typo in lookups/ldap.c: D_LOOKUP should be D_lookup. This applied
1304 only to LDAP libraries that do not have LDAP_OPT_DEREF.
1306 18. After change 4.21/52, "%ld" was used to format the contents of the $inode
1307 variable. However, some OS use ints for inodes. I've added cast to long int
1308 to get rid of the compiler warning.
1310 19. I had forgotten to lock out "/../" in configuration file names when
1311 ALT_CONFIG_PREFIX was set.
1313 20. Routers used for verification do not need to specify transports. However,
1314 if such a router generated a host list, and callout was configured, Exim
1315 crashed, because it could not find a port number from the (non-existent)
1316 transport. It now assumes port 25 in this circumstance.
1318 21. Added the -t option to exigrep.
1320 22. If LOOKUP_LSEARCH is defined, all three linear search methods (lsearch,
1321 wildlsearch, nwildlsearch) are compiled. LOOKUP_WILDLSEARCH and LOOKUP_
1322 NWILDLSEARCH are now obsolete, but retained for compatibility. If either of
1323 them is set, LOOKUP_LSEARCH is forced.
1325 23. "exim -bV" now outputs a list of lookups that are included in the binary.
1327 24. Added sender and host information to the "rejected by local_scan()" log
1328 line; previously there was no indication of these.
1330 25. Added .include_if_exists.
1332 26. Change 3.952/11 added an explicit directory sync on top of a file sync for
1333 Linux. It turns out that not all file systems support this. Apparently some
1334 versions of NFS do not. (It's rare to put Exim's spool on NFS, but people
1335 do it.) To cope with this, the error EINVAL, which means that sync-ing is
1336 not supported on the file descriptor, is now ignored when Exim is trying to
1337 sync a directory. This applies only to Linux.
1339 27. Added -DBIND_8_COMPAT to the CLFAGS setting for Darwin.
1341 28. In Darwin (MacOS X), the PAM headers are in /usr/include/pam and not in
1342 /usr/include/security. There's now a flag in OS/os.h-Darwin to cope with
1345 29. Added support for maildirsize files from supplied patch (modified a bit).
1347 30. The use of :fail: followed by an empty string could lead Exim to respond to
1348 sender verification failures with (e.g.):
1350 550 Verification failed for <xxx>
1351 550 Sender verify failed
1353 where the first response line was missing the '-' that indicates it is not
1354 the final line of the response.
1356 31. The loop for finding the name of the user that called Exim had a hardwired
1357 limit of 10; it now uses the value of finduser_retries, which is used for
1358 all other user lookups.
1360 32. Added $received_count variable, available in data and not_smtp ACLs, and at
1363 33. Exim was neglecting to zero errno before one call of strtol() when
1364 expanding a string and expecting an integer value. On some systems this
1365 resulted in spurious "integer overflow" errors. Also, it was casting the
1366 result into an int without checking.
1368 34. Testing for a connection timeout using "timeout_connect" in the retry rules
1369 did not work. The code looks as if it has *never* worked, though it appears
1370 to have been documented since at least releast 1.62. I have made it work.
1372 35. The "timeout_DNS" error in retry rules, also documented since at least
1373 1.62, also never worked. As it isn't clear exactly what this means, and
1374 clearly it isn't a major issue, I have abolished the feature by treating it
1375 as "timeout", and writing a warning to the main and panic logs.
1377 36. The display of retry rules for -brt wasn't always showing the error code
1380 37. Added new error conditions to retry rules: timeout_A, timeout_MX,
1381 timeout_connect_A, timeout_connect_MX.
1383 38. Rewriting the envelope sender at SMTP time did not allow it to be rewritten
1384 to the empty sender.
1386 39. The daemon was not analysing the content of -oX till after it had closed
1387 stderr and disconnected from the controlling terminal. This meant that any
1388 syntax errors were only noted on the panic log, and the return code from
1389 the command was 0. By re-arranging the code a little, I've made the
1390 decoding happen first, so such errors now appear on stderr, and the return
1391 code is 1. However, the actual setting up of the sockets still happens in
1392 the disconnected process, so errors there are still only recorded on the
1395 40. A daemon listener on a wildcard IPv6 socket that also accepts IPv4
1396 connections (as happens on some IP stacks) was logged at start up time as
1397 just listening for IPv6. It now logs "IPv6 with IPv4". This differentiates
1398 it from "IPv6 and IPv4", which means that two separate sockets are being
1401 41. The debug output for gethostbyname2() or getipnodebyname() failures now
1402 says whether AF_INET or AF_INET6 was passed as an argument.
1404 42. Exiwhat output was messed up when time zones were included in log
1407 43. Exiwhat now gives more information about the daemon's listening ports,
1408 and whether -tls-on-connect was used.
1410 44. The "port" option of the smtp transport is now expanded.
1412 45. A "message" modifier in a "warn" statement in a non-message ACL was being
1413 silently ignored. Now an error message is written to the main and panic
1416 46. There's a new ACL modifier called "logwrite" which writes to a log file
1417 as soon as it is encountered.
1419 47. Added $local_user_uid and $local_user_gid at routing time.
1421 48. Exim crashed when trying to verify a sender address that was being
1424 49. Exim was recognizing only a space character after ".include". It now also
1425 recognizes a tab character.
1427 50. Fixed several bugs in the Perl script that creates the exim.8 man page by
1428 extracting the relevant information from the specification. The man page no
1429 longer contains scrambled data for the -d option, and I've added a section
1430 at the front about calling Exim under different names.
1432 51. Added "extra_headers" argument to the "mail" command in filter files.
1434 52. Redirecting mail to an unqualified address in a Sieve filter caused Exim to
1437 53. Installed eximstats 1.29.
1439 54. Added transport_filter_timeout as a generic transport option.
1441 55. Exim no longer adds an empty Bcc: header to messages that have no To: or
1442 Cc: header lines. This was required by RFC 822, but it not required by RFC
1445 56. Exim used to add From:, Date:, and Message-Id: header lines to any
1446 incoming messages that did not have them. Now it does so only if the
1447 message originates locally, that is, if there is no associated remote host
1448 address. When Resent- header lines are present, this applies to the Resent-
1449 lines rather than the non-Resent- lines.
1451 57. Drop incoming SMTP connection after too many syntax or protocol errors. The
1452 limit is controlled by smtp_max_synprot_errors, defaulting to 3.
1454 58. Messages for configuration errors now include the name of the main
1455 configuration file - useful now that there may be more than one file in a
1456 list (.included file names were always shown).
1458 59. Change 4.21/82 (run initgroups() when starting the daemon) causes problems
1459 for those rare installations that do not start the daemon as root or run it
1460 setuid root. I've cut out the call to initgroups() if the daemon is not
1463 60. The Exim user and group can now be bound into the binary as text strings
1464 that are looked up at the start of Exim's processing.
1466 61. Applied a small patch for the Interbase code, supplied by Ard Biesheuvel.
1468 62. Added $mailstore_basename variable.
1470 63. Installed patch to sieve.c from Michael Haardt.
1472 64. When Exim failed to open the panic log after failing to open the main log,
1473 the original message it was trying to log was written to stderr and debug
1474 output, but if they were not available (the usual case in production), it
1475 was lost. Now it is written to syslog before the two lines that record the
1476 failures to open the logs.
1478 65. Users' Exim filters run in subprocesses under the user's uid. It is
1479 possible for a "deliver" command or an alias in a "personal" command to
1480 provoke an address rewrite. If logging of address rewriting is configured,
1481 this fails because the process is not running as root or exim. There may be
1482 a better way of dealing with this, but for the moment (because 4.30 needs
1483 to be released), I have disabled address rewrite logging when running a
1484 filter in a non-root, non-exim process.
1490 1. The buildconfig auxiliary program wasn't quoting the value set for
1491 HEADERS_CHARSET. This caused a compilation error complaining that 'ISO' was
1492 not defined. This bug was masked in 4.22 by the effect that was fixed in
1495 2. Some messages that were rejected after a message id was allocated were
1496 shown as "incomplete" by exigrep. It no longer does this for messages that
1497 are rejected by local_scan() or the DATA or non-SMTP ACLs.
1499 3. If a Message-ID: header used a domain literal in the ID, and Exim did not
1500 have allow_domain_literals set, the ID did not get logged in the <= line.
1501 Domain literals are now always recognized in Message-ID: header lines.
1503 4. The first argument for a ${extract expansion item is the key name or field
1504 number. Leading and trailing spaces in this item were not being ignored,
1505 causing some misleading effects.
1507 5. When deliver_drop_privilege was set, single queue runner processes started
1508 manually (i.e. by the command "exim -q") or by the daemon (which uses the
1509 same command in the process it spins off) were not dropping privilege.
1511 6. When the daemon running as "exim" started a queue runner, it always
1512 re-executed Exim in the spun-off process. This is a waste of effort when
1513 deliver_drop_privilege is set. The new process now just calls the
1514 queue-runner function directly.
1520 1. Typo in the src/EDITME file: it referred to HEADERS_DECODE_TO instead of
1523 2. Change 4.21/73 introduced a bug. The pid file path set by -oP was being
1524 ignored. Though the use of -oP was forcing the writing of a pid file, it
1525 was always written to the default place.
1527 3. If the message "no IP address found for host xxxx" is generated during
1528 incoming verification, it is now followed by identification of the incoming
1529 connection (so you can more easily find what provoked it).
1531 4. Bug fix for Sieve filters: "stop" inside a block was not working properly.
1533 5. Added some features to "harden" Exim a bit more against certain attacks:
1535 (a) There is now a build-time option called FIXED_NEVER_USERS that can
1536 be put in Local/Makefile. This is like the never_users runtime option,
1537 but it cannot be overridden. The default setting is "root".
1539 (b) If ALT_CONFIG_PREFIX is defined in Local/Makefile, it specifies a
1540 prefix string with which any file named in a -C command line option
1543 (c) If ALT_CONFIG_ROOT_ONLY is defined in Local/Makefile, root privilege
1544 is retained for -C and -D only if the caller of Exim is root. Without
1545 it, the exim user may also use -C and -D and retain privilege.
1547 (d) If DISABLE_D_OPTION is defined in Local/Makefile, the use of the -D
1548 command line option is disabled.
1550 6. Macro names set by the -D option must start with an upper case letter, just
1551 like macro names defined in the configuration file.
1553 7. Added "dereference=" facility to LDAP.
1555 8. Two instances of the typo "uknown" in the source files are fixed.
1557 9. If a PERL_COMMAND setting in Local/Makefile was not at the start of a line,
1558 the Configure-Makefile script screwed up while processing it.
1560 10. Incorporated PCRE 4.4.
1562 11. The SMTP synchronization check was not operating right at the start of an
1563 SMTP session. For example, it could not catch a HELO sent before the client
1564 waited for the greeting. There is now a check for outstanding input at the
1565 point when the greeting is written. Because of the duplex, asynchronous
1566 nature of TCP/IP, it cannot be perfect - the incorrect input may be on its
1567 way, but not yet received, when the check is performed.
1569 12. Added tcp_nodelay to make it possible to turn of the setting of TCP_NODELAY
1570 on TCP/IP sockets, because this apparently causes some broken clients to
1573 13. Installed revised OS/Makefile-CYGWIN and OS/os.c-cygwin (the .h file was
1574 unchanged) from the Cygwin maintainer.
1576 14. The code for -bV that shows what is in the binary showed "mbx" when maildir
1577 was supported instead of testing for mbx. Effectively a typo.
1579 15. The spa authenticator server code was not checking that the input it
1580 received was valid base64.
1582 16. The debug output line for the "set" modifier in ACLs was not showing the
1583 name of the variable that was being set.
1585 17. Code tidy: the variable type "vtype_string" was never used. Removed it.
1587 18. Previously, a reference to $sender_host_name did not cause a DNS reverse
1588 lookup on its own. Something else was needed to trigger the lookup. For
1589 example, a match in host_lookup or the need for a host name in a host list.
1590 Now, if $sender_host_name is referenced and the host name has not yet been
1591 looked up, a lookup is performed. If the lookup fails, the variable remains
1592 empty, and $host_lookup_failed is set to "1".
1594 19. Added "eqi" as a case-independent comparison operator.
1596 20. The saslauthd authentication condition could segfault if neither service
1597 nor realm was specified.
1599 21. If an overflowing value such as "2048M" was set for message_size_limit, the
1600 error message that was logged was misleading, and incoming SMTP
1601 connections were dropped. The message is now more accurate, and temporary
1602 errors are given to SMTP connections.
1604 22. In some error situations (such as 21 above) Exim rejects all SMTP commands
1605 (except RSET) with a 421 error, until QUIT is received. However, it was
1606 failing to send a response to QUIT.
1608 23. The HELO ACL was being run before the code for helo_try_verify_hosts,
1609 which made it impossible to use "verify = helo" in the HELO ACL. The HELO
1610 ACL is now run after the helo_try_verify_hosts code.
1612 24. "{MD5}" and "{SHA1}" are now recognized as equivalent to "{md5"} and
1613 "{sha1}" in the "crypteq" expansion condition (in fact the comparison is
1614 case-independent, so other case variants are also recognized). Apparently
1615 some systems use these upper case variants.
1617 25. If more than two messages were waiting for the same host, and a transport
1618 filter was specified for the transport, Exim sent two messages over the
1619 same TCP/IP connection, and then failed with "socket operation on non-
1620 socket" when it tried to send the third.
1622 26. Added Exim::debug_write and Exim::log_write for embedded Perl use.
1624 27. The extern definition of crypt16() in expand.c was not being excluded when
1625 the OS had its own crypt16() function.
1627 28. Added bounce_return_body as a new option, and bounce_return_size_limit
1628 as a preferred synonym for return_size_limit, both as an option and as an
1631 29. Added LIBS=-liconv to OS/Makefile-OSF1.
1633 30. Changed the default configuration ACL to relax the local part checking rule
1634 for addresses that are not in any local domains. For these addresses,
1635 slashes and pipe symbols are allowed within local parts, but the sequence
1636 /../ is explicitly forbidden.
1638 31. SPA server authentication was not clearing the challenge buffer before
1641 32. log_message in a "warn" ACL statement was writing to the reject log as
1642 well as to the main log, which contradicts the documentation and doesn't
1643 seem right (because no rejection is happening). So I have stopped it.
1645 33. Added Ard Biesheuvel's lookup code for accessing an Interbase database.
1646 However, I am unable to do any testing of this.
1648 34. Fixed an infelicity in the appendfile transport. When checking directories
1649 for a mailbox, to see if any needed to be created, it was accidentally
1650 using path names with one or more superfluous leading slashes; tracing
1651 would show up entries such as stat("///home/ph10", 0xFFBEEA48).
1653 35. If log_message is set on a "discard" verb in a MAIL or RCPT ACL, its
1654 contents are added to the log line that is written for every discarded
1655 recipient. (Previously a log_message setting was ignored.)
1657 36. The ${quote: operator now quotes the string if it is empty.
1659 37. The install script runs exim in order to find its version number. If for
1660 some reason other than non-existence or emptiness, which it checks, it
1661 could not run './exim', it was installing it with an empty version number,
1662 i.e. as "exim-". This error state is now caught, and the installation is
1665 38. An argument was missing from the function that creates an error message
1666 when Exim fails to connect to the socket for saslauthd authentication.
1667 This could cause Exim to crash, or give a corrupted message.
1669 39. Added isip, isip4, and isip6 to ${if conditions.
1671 40. The ACL variables $acl_xx are now saved with the message, and can be
1672 accessed later in routers, transports, and filters.
1674 41. The new lookup type nwildlsearch is like wildlsearch, except that the key
1675 strings in the file are not string-expanded.
1677 42. If a MAIL command specified a SIZE value that was too large to fit into an
1678 int variable, the check against message_size_limit failed. Such values are
1679 now forced to INT_MAX, which is around 2Gb for a 32-bit variable. Maybe one
1680 day this will have to be increased, but I don't think I want to be around
1681 when emails are that large.
1688 1. Removed HAVE_ICONV=yes from OS/Makefile-FreeBSD, since it seems that
1689 iconv() is not standard in FreeBSD.
1691 2. Change 4.21/17 was buggy and could cause stack overwriting on a system with
1692 IPv6 enabled. The observed symptom was a segmentation fault on return from
1693 the function os_common_find_running_interfaces() in src/os.c.
1695 3. In the check_special_case() function in daemon.c I had used "errno" as an
1696 argument name, which causes warnings on some systems. This was basically a
1697 typo, since it was named "eno" in the comments!
1699 4. The code that waits for the clock to tick (at a resolution of some fraction
1700 of a second) so as to ensure message-id uniqueness was always waiting for
1701 at least one whole tick, when it could have waited for less. [This is
1702 almost certainly not relevant at current processor speeds, where it is
1703 unlikely to ever wait at all. But we try to future-proof.]
1705 5. The function that sleeps for a time interval that includes fractions of a
1706 second contained a race. It did not block SIGALRM between setting the
1707 timer, and suspending (a couple of lines later). If the interval was short
1708 and the sigsuspend() was delayed until after it had expired, the suspension
1709 never ended. On busy systems this could lead to processes getting stuck for
1712 6. Some uncommon configurations may cause a lookup to happen in a queue runner
1713 process, before it forks any delivery processes. The open lookup caching
1714 mechanism meant that the open file or database connection was passed into
1715 the delivery process. The problem was that delivery processes always tidy
1716 up cached lookup data. This could cause a problem for the next delivery
1717 process started by the queue runner, because the external queue runner
1718 process does not know about the closure. So the next delivery process
1719 still has data in the lookup cache. In the case of a file lookup, there was
1720 no problem because closing a file descriptor in a subprocess doesn't affect
1721 the parent. However, if the lookup was caching a connection to a database,
1722 the connection was closed, and the second delivery process was likely to
1723 see errors such as "PGSQL: query failed: server closed the connection
1724 unexpectedly". The problem has been fixed by closing all cached lookups
1725 in a queue runner before running a delivery process.
1727 7. Compiler warning on Linux for the second argument of iconv(), which doesn't
1728 seem to have the "const" qualifier which it has on other OS. I've
1731 8. Change 4.21/2 was too strict. It is only if there are two authenticators
1732 *of the same type* (client or server) with the same public name that an
1733 error should be diagnosed.
1735 9. When Exim looked up a host name for an IP address, but failed to find the
1736 original IP address when looking up the host name (a safety check), it
1737 output the message "<ip address> does not match any IP for NULL", which was
1738 confusing, to say the least. The bug was that the host name should have
1739 appeared instead of "NULL".
1741 10. Since release 3.03, if Exim is called by a uid other than root or the Exim
1742 user that is built into the binary, and the -C or -D options is used, root
1743 privilege is dropped before the configuration file is read. In addition,
1744 logging is switched to stderr instead of the normal log files. If the
1745 configuration then re-defines the Exim user, the unprivileged environment
1746 is probably not what is expected, so Exim logs a panic warning message (but
1749 However, if deliver_drop_privilege is set, the unprivileged state may well
1750 be exactly what is intended, so the warning has been cut out in that case,
1751 and Exim is allowed to try to write to its normal log files.
1757 1. smtp_return_error_details was not giving details for temporary sender
1758 or receiver verification errors.
1760 2. Diagnose a configuration error if two authenticators have the same public
1763 3. Exim used not to create the message log file for a message until the first
1764 delivery attempt. This could be confusing when incoming messages were held
1765 for policy or load reasons. The message log file is now created at the time
1766 the message is received, and an initial "Received" line is written to it.
1768 4. The automatically generated man page for command line options had a minor
1769 bug that caused no ill effects; however, a more serious problem was that
1770 the procedure for building the man page automatically didn't always
1771 operate. Consequently, release 4.20 contains an out-of-date version. This
1772 shouldn't happen again.
1774 5. When building Exim with embedded Perl support, the script that builds the
1775 Makefile was calling 'perl' to find its compile-time parameters, ignoring
1776 any setting of PERL_COMMAND in Local/Makefile. This is now fixed.
1778 6. The freeze_tell option was not being used for messages that were frozen on
1779 arrival, either by an ACL or by local_scan().
1781 7. Added the smtp_incomplete_transaction log selector.
1783 8. After STARTTLS, Exim was not forgetting that it had advertised AUTH, so it
1784 was accepting AUTH without a new EHLO.
1786 9. Added tls_remember_esmtp to cope with YAEB. This allows AUTH and other
1787 ESMTP extensions after STARTTLS without a new EHLO, in contravention of the
1790 10. Logging of TCP/IP connections (when configured) now happens in the main
1791 daemon process instead of the child process, so that the TCP/IP connection
1792 count is more accurate (but it can never be perfect).
1794 11. The use of "drop" in a nested ACL was not being handled correctly in the
1795 outer ACL. Now, if condition failure induced by the nested "drop" causes
1796 the outer ACL verb to deny access ("accept" or "discard" after "endpass",
1797 or "require"), the connection is dropped.
1799 12. Similarly, "discard" in a nested ACL wasn't being handled. A nested ACL
1800 that yield "discard" can now be used with an "accept" or a "discard" verb,
1801 but an error is generated for any others (because I can't see a useful way
1802 to define what should happen).
1804 13. When an ACL is read dynamically from a file (or anywhere else), the lines
1805 are now processed in the same way as lines in the Exim configuration file.
1806 In particular, continuation lines are supported.
1808 14. Added the "dnslists = a.b.c!=n.n.n.n" feature.
1810 15. Added -ti meaning -t -i.
1812 16. Check for letters, digits, hyphens, and dots in the names of dnslist
1813 domains, and warn by logging if others are found.
1815 17. At least on BSD, alignment is not guarenteed for the array of ifreq's
1816 returned from GIFCONF when Exim is trying to find the list of interfaces on
1817 a host. The code in os.c has been modified to copy each ifreq to an aligned
1818 structure in all cases.
1820 Also, in some cases, the returned ifreq's were being copied to a 'struct
1821 ifreq' on the stack, which was subsequently passed to host_ntoa(). That
1822 means the last couple of bytes of an IPv6 address could be chopped if the
1823 ifreq contained only a normal sockaddr (14 bytes storage).
1825 18. Named domain lists were not supported in the hosts_treat_as_local option.
1826 An entry such as +xxxx was not recognized, and was treated as a literal
1829 19. Ensure that header lines added by a DATA ACL are included in the reject log
1830 if the ACL subsequently rejects the message.
1832 20. Upgrade the cramtest.pl utility script to use Digest::MD5 instead of just
1833 MD5 (which is deprecated).
1835 21. When testing a filter file using -bf, Exim was writing a message when it
1836 took the sender from a "From " line in the message, but it was not doing so
1837 when it took $return_path from a Return-Path: header line. It now does.
1839 22. If the contents of a "message" modifier for a "warn" ACL verb do not begin
1840 with a valid header line field name (a series of printing characters
1841 terminated by a colon, Exim now inserts X-ACL-Warn: at the beginning.
1843 23. Changed "disc" in the source to "disk" to conform to the documentation and
1844 the book and for uniformity.
1846 24. Ignore Sendmail's -Ooption=value command line item.
1848 25. When execve() failed while trying to run a command in a pipe transport,
1849 Exim was returning EX_UNAVAILBLE (69) from the subprocess. However, this
1850 could be confused with a return value of 69 from the command itself. This
1851 has been changed to 127, the value the shell returns if it is asked to run
1852 a non-existent command. The wording for the related log line suggests a
1853 non-existent command as the problem.
1855 26. If received_header_text expands to an empty string, do not add a Received:
1856 header line to the message. (Well, it adds a token one on the spool, but
1857 marks it "old" so that it doesn't get used or transmitted.)
1859 27. Installed eximstats 1.28 (addition of -nt option).
1861 28. There was no check for failure on the call to getsockname() in the daemon
1862 code. This can fail if there is a shortage of resources on the system, with
1863 ENOMEM, for example. A temporary error is now given on failure.
1865 29. Contrary to the C standard, it seems that in some environments, the
1866 equivalent of setlocale(LC_ALL, "C") is not obeyed at the start of a C
1867 program. Exim now does this explicitly; it affects the formatting of
1868 timestamps using strftime().
1870 30. If exiqsumm was given junk data, it threw up some uninitialized variable
1871 complaints. I've now initialized all the variables, to avoid this.
1873 32. Header lines added by a system filter were not being "seen" during
1874 transport-time rewrites.
1876 33. The info_callback() function passed to OpenSSL is set up with type void
1877 (*)(SSL *, int, int), as described somewhere. However, when calling the
1878 function (actually a macro) that sets it up, the type void(*)() is
1879 expected. I've put in a cast to prevent warnings from picky compilers.
1881 34. If a DNS black list lookup found a CNAME record, but there were no A
1882 records associated with the domain it pointed at, Exim crashed.
1884 35. If a DNS black list lookup returned more than one A record, Exim ignored
1885 all but the first. It now scans all returned addresses if a particular IP
1886 value is being sought. In this situation, the contents of the
1887 $dnslist_value variable are a list of all the addresses, separated by a
1890 36. Tightened up the rules for host name lookups using reverse DNS. Exim used
1891 to accept a host name and all its aliases if the forward lookup for any of
1892 them yielded the IP address of the incoming connection. Now it accepts only
1893 those names whose forward lookup yields the correct IP address. Any other
1894 names are discarded. This closes a loophole whereby a rogue DNS
1895 administrator could create reverse DNS records to break through a
1896 wildcarded host restriction in an ACL.
1898 37. If a user filter or a system filter that ran in a subprocess used any of
1899 the numerical variables ($1, $2 etc), or $thisaddress, in a pipe command,
1900 the wrong values were passed to the pipe command ($thisaddress had the
1901 value of $0, $0 had the value of $1, etc). This bug was introduced by
1902 change 4.11/101, and not discovered because I wrote an inadequate test. :-(
1904 38. Improved the line breaking for long SMTP error messages from ACLs.
1905 Previously, if there was no break point between 40 and 75 characters, Exim
1906 left the rest of the message alone. Two changes have been made: (a) I've
1907 reduced the minimum length to 35 characters; (b) if it can't find a break
1908 point between 35 and 75 characters, it looks ahead and uses the first one
1909 that it finds. This may give the occasional overlong line, but at least the
1910 remaining text gets split now.
1912 39. Change 82 of 4.11 was unimaginative. It assumed the limit on the number of
1913 file descriptors might be low, and that setting 1000 would always raise it.
1914 It turns out that in some environments, the limit is already over 1000 and
1915 that lowering it causes trouble. So now Exim takes care not to decrease it.
1917 40. When delivering a message, the value of $return_path is set to $sender_
1918 address at the start of routing (routers may change the value). By an
1919 oversight, this default was not being set up when an address was tested by
1920 -bt or -bv, which affected the outcome if any router or filter referred to
1923 41. The idea of the "warn" ACL verb is that it adds a header or writes to the
1924 log only when "message" or "log_message" are set. However, if one of the
1925 conditions was an address verification, or a call to a nested ACL, the
1926 messages generated by the underlying test were being passed through. This
1927 no longer happens. The underlying message is available in $acl_verify_
1928 message for both "message" and "log_message" expansions, so it can be
1929 passed through if needed.
1931 42. Added RFC 2047 interpretation of header lines for $h_ expansions, with a
1932 new expansion $bh_ to give the encoded byte string without charset
1933 translation. Translation happens only if iconv() is available; HAVE_ICONV
1934 indicates this at build time. HEADERS_CHARSET gives the charset to
1935 translate to; headers_charset can change it in the configuration, and
1936 "headers charset" can change it in an individual filter file.
1938 43. Now that we have a default RFC 2047 charset (see above), the code in Exim
1939 that creates RFC 2047 encoded "words" labels them as that charset instead
1940 of always using iso-8859-1. The cases are (i) the explicit ${rfc2047:
1941 expansion operator; (ii) when Exim creates a From: line for a local
1942 message; (iii) when a header line is rewritten to include a "phrase" part.
1944 44. Nasty bug in exiqsumm: the regex to skip already-delivered addresses was
1945 buggy, causing it to skip the first lines of messages whose message ID
1946 ended in 'D'. This would not have bitten before Exim release 4.14, because
1947 message IDs were unlikely to end in 'D' before then. The effect was to have
1948 incorrect size information for certain domains.
1950 45. #include "config.h" was missing at the start of the crypt16.c module. This
1951 caused trouble on Tru64 (aka OSF1) systems, because HAVE_CRYPT16 was not
1954 46. If there was a timeout during a "random" callout check, Exim treated it as
1955 a failure of the random address, and carried on sending RSET and the real
1956 address. If the delay was just some slowness somewhere, the response to the
1957 original RCPT would be taken as a response to RSET and so on, causing
1958 mayhem of various kinds.
1960 47. Change 50 for 4.20 was a heap of junk. I don't know what I was thinking
1961 when I implemented it. It didn't allow for the fact that some option values
1962 may legitimatetly be negative (e.g. size_addition), and it didn't even do
1963 the right test for positive values.
1965 48. Domain names in DNS records are case-independent. Exim always looks them up
1966 in lower case. Some resolvers return domain names in exactly the case they
1967 appear in the zone file, that is, they may contain uppercase letters. Not
1968 all resolvers do this - some return always lower case. Exim was treating a
1969 change of case by a resolver as a change of domain, similar to a widening
1970 of a domain abbreviation. This triggered its re-routing code and so it was
1971 trying to route what was effectively the same domain again. This normally
1972 caused routing to fail (because the router wouldn't handle the domain
1973 twice). Now Exim checks for this case specially, and just changes the
1974 casing of the domain that it ultimately uses when it transmits the message
1977 49. Added Sieve (RFC 3028) support, courtesy of Michael Haardt's contributed
1980 50. If a filter generated a file delivery with a non-absolute name (possible if
1981 no home directory exists for the router), the forbid_file option was not
1984 51. Added '&' feature to dnslists, to provide bit mask matching in addition to
1985 the existing equality matching.
1987 52. Exim was using ints instead of ino_t variables in some places where it was
1988 dealing with inode numbers.
1990 53. If TMPDIR is defined in Local/Makefile (default in src/EDITME is
1991 TMPDIR="/tmp"), Exim checks for the presence of an environment variable
1992 called TMPDIR, and if it finds it is different, it changes its value.
1994 54. The smtp_printf() function is now made available to local_scan() so
1995 additional output lines can be written before returning. There is also an
1996 smtp_fflush() function to enable the detection of a dropped connection.
1997 The variables smtp_input and smtp_batched_input are exported to
2000 55. Changed the default runtime configuration: the message "Unknown user"
2001 has been removed from the ACL, and instead placed on the localuser router,
2002 using the cannot_route_message feature. This means that any verification
2003 failures that generate their own messages won't get overridden. Similarly,
2004 the "Unrouteable address" message that was in the ACL for unverifiable
2005 relay addresses has also been removed.
2007 56. Added hosts_avoid_esmtp to the smtp transport.
2009 57. The exicyclog script was not checking for the esoteric option
2010 CONFIGURE_FILE_USE_EUID in the Local/Makefile. It now does this, but it
2011 will work only if exicyclog is run under the appropriate euid.
2013 58. Following a discussion on the list, the rules by which Exim recognises line
2014 endings on incoming messages have been changed. The -dropcr and drop_cr
2015 options are now no-ops, retained only for backwards compatibility. The
2016 following line terminators are recognized: LF CRLF CR. However, special
2017 processing applies to CR:
2019 (i) The sequence CR . CR does *not* terminate an incoming SMTP message,
2020 nor a local message in the state where . is a terminator.
2022 (ii) If a bare CR is encountered in a header line, an extra space is added
2023 after the line terminator so as not to end the header. The reasoning
2024 behind this is that bare CRs in header lines are most likely either
2025 to be mistakes, or people trying to play silly games.
2027 59. The size of a message, as listed by "-bp" or in the Exim monitor window,
2028 was being incorrectly given as 18 bytes larger than it should have been.
2029 This is a VOB (very old bug).
2031 60. This may never have affected anything current, but just in case it has:
2032 When the local host is found other than at the start of a list of hosts,
2033 the local host, those with the same MX, and any that follow, are discarded.
2034 When the list in question was part of a longer list of hosts, the following
2035 hosts (not currently being processed) were also being discarded. This no
2036 longer happens. I'm not sure if this situation could ever has previously
2039 61. Added the "/MX" feature to lists of hosts in the manualroute and query
2042 62. Whenever Exim generates a new message, it now adds an Auto-Submitted:
2043 header. This is something that is recommended in a new Internet Draft, and
2044 is something that is documented as being done by Sendmail. There are two
2045 possible values. For messages generated by the autoreply transport, Exim
2048 Auto-Submitted: auto-replied
2050 whereas for all other generated messages (e.g. bounces) it adds
2052 Auto-Submitted: auto-generated
2054 63. The "personal" condition in filters now includes a test for the
2055 Auto-Submitted: header. If it contains the string "auto-" the message it
2056 not considered personal.
2058 64. Added rcpt_include_affixes as a generic transport option.
2060 65. Added queue_only_override (default true).
2062 66. Added the syslog_duplication option.
2064 67. If what should have been the first header line of a message consisted of
2065 a space followed by a colon, Exim was mis-interpreting it as a header line.
2066 It isn't of course - it is syntactically invalid and should therefore be
2067 treated as the start of the message body. The misbehaviour could have
2068 caused a number of strange effects, including loss of data in subsequent
2069 header lines, and spool format errors.
2071 68. Formerly, the AUTH parameter on a MAIL command was trusted only if the
2072 client host had authenticated. This control can now be exercised by an ACL
2073 for more flexibility.
2075 69. By default, callouts do not happen when testing with -bh. There is now a
2076 variant, -bhc, which does actually run the callout code, including
2077 consulting and updating the callout cache.
2079 70. Added support for saslauthd authentication, courtesy of Alexander
2082 71. If statvfs() failed on the spool or log directories while checking their
2083 size for availability, Exim confusingly gave the error "space shortage".
2084 Furthermore, in debugging mode it crashed with a floating point exception.
2085 These checks are done if check_{spool,log}_{space,inodes} are set, and when
2086 an SMTP message arrives with SIZE= on the MAIL command. As this is a really
2087 serious problem, Exim now writes to the main and panic logs when this
2088 happens, with details of the failure. It then refuses to accept the
2089 incoming message, giving the message "spool directory problem" or "log
2090 directory problem" with a 421 code for SMTP messages.
2092 72. When Exim is about to re-exec itself, it ensures that the file descriptors
2093 0, 1, and 2 exist, because some OS complain for execs without them (see
2094 ChangeLog 4.05/30). If necessary, Exim opens /dev/null to use for these
2095 descriptors. However, the code omitted to check that the open succeeded,
2096 causing mysterious errors if for some reason the permissions on /dev/null
2097 got screwed. Now Exim writes a message to the main and panic logs, and
2098 bombs out if it can't open /dev/null.
2100 73. Re-vamped the way daemon_smtp_port, local_interfaces, and -oX work and
2101 interact so that it is all more flexible. It is supposed to remain
2102 backwards compatible. Also added extra_local_interfaces.
2104 74. Invalid data sent to a SPA (NTLM) server authenticator could cause the code
2105 to bomb out with an assertion failure - to the client this appears as a
2106 connection drop. This problem occurs in the part of the code that was taken
2107 from the Samba project. Fortunately, the assertion is in a very simple
2108 function, so I have fixed this by reproducing the function inline in the
2109 one place where it is called, and arranging for authentication to fail
2110 instead of killing the process with assert().
2112 75. The SPA client code was not working when the server requested OEM rather
2113 than Unicode encoding.
2115 76. Added code to make require_files with a specific uid setting more usable in
2116 the case where statting the file as root fails - usually a non-root-mounted
2117 NFS file system. When this happens and the failure is EACCES, Exim now
2118 forks a subprocess and does the per-uid checking as the relevant uid.
2120 77. Added process_log_path.
2122 78. If log_file_path was not explicitly set, a setting of check_log_space or
2123 check_log_inodes was ignored.
2125 79. If a space check for the spool or log partitions fails, the incident is now
2126 logged. Of course, in the latter case the data may get lost...
2128 80. Added the %p formatting code to string_format() so that it can be used to
2129 print addresses in debug_print(). Adjusted all the address printing in the
2130 debugging in store.c to use %p rather than %d.
2132 81. There was a concern that a line of code in smtp_in.c could overflow a
2133 buffer if a HELO/EHLO command was given followed by 500 or so spaces. As
2134 initially expressed, the concern was not well-founded, because trailing
2135 spaces are removed early. However, if the trailing spaces were followed by
2136 a NULL, they did not get removed, so the overflow was possible. Two fixes
2139 (a) I re-wrote the offending code in a cleaner fashion.
2140 (b) If an incoming SMTP command contains a NULL character, it is rejected
2143 82. When Exim changes uid/gid to the Exim user at daemon start time, it now
2144 runs initgroups(), so that if the Exim user is in any additional groups,
2145 they will be used during message reception.
2151 The change log for 4.20 and earlier releases has been archived.
projects / exim.git / blob