X-Git-Url: https://git.exim.org/users/heiko/exim.git/blobdiff_plain/7086e875ca3e382883f31ef4385044d77c66c035..415c8f3b2abccd8f04b0095551919adf142e6eee:/doc/doc-txt/ChangeLog

diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index 6e1d523b4..d7d60c09c 100644
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -1,10 +1,356 @@
-$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.4 2004/10/14 11:21:02 ph10 Exp $
+$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.143 2005/05/24 10:57:10 ph10 Exp $
 
 Change log file for Exim from version 4.21
 -------------------------------------------
 
 
-Exim version 4.44
+Exim version 4.52
+-----------------
+
+TF/01 Added support for Client SMTP Authorization. See NewStuff for details.
+
+PH/01 When a transport filter timed out in a pipe delivery, and the pipe
+      command itself ended in error, the underlying message about the transport
+      filter timeout was being overwritten with the pipe command error. Now the
+      underlying error message should be appended to the second error message.
+
+TK/01 Fix poll() being unavailable on Mac OSX 10.2.
+
+PH/02 Reduce the amount of output that "make" produces by default. Full output
+      can still be requested.
+
+PH/03 The warning log line about a condition test deferring for a "warn" verb
+      was being output only once per connection, rather than after each
+      occurrence (because it was using the same function as for successful
+      "warn" verbs). This seems wrong, so I have changed it.
+
+TF/02 Two buglets in acl.c which caused Exim to read a few bytes of memory that
+      it should not have, which might have caused a crash in the right
+      circumstances, but probably never did.
+
+PH/04 Installed a modified version of Tony Finch's patch to make submission
+      mode fix the return path as well as the Sender: header line, and to
+      add a /name= option so that you can make the user's friendly name appear
+      in the header line.
+
+TF/03 Added the control = fakedefer ACL modifier.
+
+TF/04 Added the ratelimit ACL condition. See NewStuff for details.
+
+TK/02 Rewrote SPF support to work with libspf2 versions >1.2.0.
+
+TK/03 Merged latest SRS patch from Miles Wilton.
+
+PH/05 There's a shambles in IRIX6 - it defines EX_OK in unistd.h which conflicts
+      with the definition in sysexits.h (which is #included earlier).
+      Fortunately, Exim does not actually use EX_OK. The code used to try to
+      preserve the sysexits.h value, by assumimg that macro definitions were
+      scanned for macro replacements. I have been disabused of this notion,
+      so now the code just undefines EX_OK before #including unistd.h.
+
+
+Exim version 4.51
+-----------------
+
+TK/01 Added Yahoo DomainKeys support via libdomainkeys. See
+      doc/experimental-spec.txt for details. (http://domainkeys.sf.net)
+
+TK/02 Fix ACL "control" statement not being available in MIME ACL.
+
+TK/03 Fix ACL "regex" condition not being available in MIME ACL.
+
+PH/01 Installed a patch from the Sieve maintainer that allows -bf to be used
+      to test Sieve filters that use "vacation".
+
+PH/02 Installed a slightly modified version of Nikos Mavrogiannopoulos' patch
+      that changes the way the GnuTLS parameters are stored in the cache file.
+      The new format can be generated externally. For backward compatibility,
+      if the data in the cache doesn't make sense, Exim assumes it has read an
+      old-format file, and it generates new data and writes a new file. This
+      means that you can't go back to an older release without removing the
+      file.
+
+PH/03 A redirect router that has both "unseen" and "one_time" set does not
+      work if there are any delivery delays because "one_time" forces the
+      parent to be marked "delivered", so its unseen clone is never tried
+      again. For this reason, Exim now forbids the simultaneous setting of
+      these two options.
+
+PH/04 Change 4.11/85 fixed an obscure bug concerned with addresses that are
+      redirected to themselves ("homonym" addresses). Read the long ChangeLog
+      entry if you want to know the details. The fix, however, neglected to
+      consider the case when local delivery batching is involved. The test for
+      "previously delivered" was not happening when checking to see if an
+      address could be batched with a previous (undelivered) one; under
+      certain circumstances this could lead to multiple deliveries to the same
+      address.
+
+PH/05 Renamed the macro SOCKLEN_T as EXIM_SOCKLEN_T because AIX uses SOCKLEN_T
+      in its include files, and this causes problems building Exim.
+
+PH/06 A number of "verify =" ACL conditions have no options (e.g. verify =
+      header_syntax) but Exim was just ignoring anything given after a slash.
+      In particular, this caused confusion with an attempt to use "verify =
+      reverse_host_lookup/defer_ok". An error is now given when options are
+      supplied for verify items that do not have them. (Maybe reverse_host_
+      lookup should have a defer_ok option, but that's a different point.)
+
+PH/07 Increase the size of the buffer for incoming SMTP commands from 512 (as
+      defined by RFC 821) to 2048, because there were problems with some AUTH
+      commands, and RFC 1869 says the size should be increased for extended
+      SMTP commands that take arguments.
+
+PH/08 Added ${dlfunc dynamically loaded function for expansion (code from Tony
+      Finch).
+
+PH/09 Previously, an attempt to use ${perl when it wasn't compiled gave an
+      "unknown" error; now it says that the functionality isn't in the binary.
+
+PH/10 Added a nasty fudge to try to recognize and flatten LDAP passwords in
+      an address' error message when a string expansion fails (syntax or
+      whatever). Otherwise the password may appear in the log. Following change
+      PH/42 below, there is no longer a chance of it appearing in a bounce
+      message.
+
+PH/11 Installed exipick version 20050225.0 from John Jetmore.
+
+PH/12 If the last host in a fallback_hosts list was multihomed, only the first
+      of its addresses was ever tried. (Bugzilla bug #2.)
+
+PH/13 If "headers_add" in a transport didn't end in a newline, Exim printed
+      the result incorrectly in the debug output. (It correctly added a newline
+      to what was transported.)
+
+TF/01 Added $received_time.
+
+PH/14 Modified the default configuration to add an acl_smtp_data ACL, with
+      commented out examples of how to interface to a virus scanner and to
+      SpamAssassin. Also added commented examples of av_scanner and
+      spamd_address settings.
+
+PH/15 Further to TK/02 and TK/03 above, tidied up the tables of what conditions
+      and controls are allowed in which ACLs. There were a couple of minor
+      errors. Some of the entries in the conditions table (which is a table of
+      where they are NOT allowed) were getting very unwieldy; rewrote them as a
+      negation of where the condition IS allowed.
+
+PH/16 Installed updated OS/os.c-cygwin from the Cygwin maintainer.
+
+PH/17 The API for radiusclient changed at release 0.4.0. Unfortunately, the
+      header file does not have a version number, so I've had to invent a new
+      value for RADIUS_LIB_TYPE, namely "RADIUSCLIENTNEW" to request the new
+      API. The code is untested by me (my Linux distribution still has 0.3.2 of
+      radiusclient), but it was contributed by a Radius user.
+
+PH/18 Installed Lars Mainka's patch for the support of CRL collections in
+      files or directories, for OpenSSL.
+
+PH/19 When an Exim process that is running as root has to create an Exim log
+      file, it does so in a subprocess that runs as exim:exim so as to get the
+      ownership right at creation (otherwise, other Exim processes might see
+      the file with the wrong ownership). There was no test for failure of this
+      fork() call, which would lead to the process getting stuck as it waited
+      for a non-existent subprocess. Forks do occasionally fail when resources
+      run out. I reviewed all the other calls to fork(); they all seem to check
+      for failure.
+
+PH/20 When checking for unexpected SMTP input at connect time (before writing
+      the banner), Exim was not dealing correctly with a non-positive return
+      from the read() function. If the client had disconnected by this time,
+      the result was a log entry for a synchronization error with an empty
+      string after "input=" when read() returned zero. If read() returned -1
+      (an event I could not check), uninitialized data bytes were printed.
+      There were reports of junk text (parts of files, etc) appearing after
+      "input=".
+
+PH/21 Added acl_not_smtp_mime to allow for MIME scanning for non-SMTP messages.
+
+PH/22 Added support for macro redefinition, and (re)definition in between
+      driver and ACL definitions.
+
+PH/23 The cyrus_sasl authenticator was expanding server_hostname, but then
+      forgetting to use the resulting value; it was using the unexpanded value.
+
+PH/24 The cyrus_sasl authenticator was advertising mechanisms for which it
+      hadn't been configured. The fix is from Juergen Kreileder, who
+      understands it better than I do:
+
+      "Here's what I see happening with three configured cyrus_sasl
+      authenticators configured (plain, login, cram-md5):
+
+      On startup auth_cyrus_sasl_init() gets called for each of these.
+      This means three calls to sasl_listmech() without a specified mech_list.
+      => SASL tests which mechs of all available mechs actually work
+      => three warnings about OTP not working
+      => the returned list contains: plain, login, cram-md5, digest-md5, ...
+
+      With the patch, sasl_listmech() also gets called three times.  But now
+      SASL's mech_list option is set to the server_mech specified in the the
+      authenticator.  Or in other words, the answer from sasl_listmech()
+      gets limited to just the mech you're testing for (which is different
+      for each call.)
+      => the return list contains just 'plain' or 'login', 'cram-md5' or
+      nothing depending on the value of ob->server_mech.
+
+      I've just tested the patch: Authentication still works fine,
+      unavailable mechs specified in the exim configuration are still
+      caught, and the auth.log warnings about OTP are gone."
+
+PH/25 When debugging is enabled, the contents of the command line are added
+      to the debugging output, even when log_selector=+arguments is not
+      specified.
+
+PH/26 Change scripts/os-type so that when "uname -s" returns just "GNU", the
+      answer is "GNU", and only if the return is "GNU/something" is the answer
+      "Linux".
+
+PH/27 $acl_verify_message is now set immediately after the failure of a
+      verification in an ACL, and so is available in subsequent modifiers. In
+      particular, the message can be preserved by coding like this:
+
+         warn  !verify = sender
+               set acl_m0 = $acl_verify_message
+
+      Previously, $acl_verify_message was set only while expanding "message"
+      and "log_message" when a very denied access.
+
+PH/28 Modified OS/os.c-Linux with
+
+        -#ifndef OS_LOAD_AVERAGE
+        +#if !defined(OS_LOAD_AVERAGE) && defined(__linux__)
+
+      to make Exim compile on kfreebsd-gnu. (I'm totally confused about the
+      nomenclature these days.)
+
+PH/29 Installed patch from the Sieve maintainer that adds the options
+      sieve_useraddress and sieve_subaddress to the redirect router.
+
+PH/30 In these circumstances:
+        . Two addresses routed to the same list of hosts;
+        . First host does not offer TLS;
+        . First host accepts first address;
+        . First host gives temporary error to second address;
+        . Second host offers TLS and a TLS session is established;
+        . Second host accepts second address.
+      Exim incorrectly logged both deliveries with the TLS parameters (cipher
+      and peerdn, if requested) that were in fact used only for the second
+      address.
+
+PH/31 When doing a callout as part of verifying an address, Exim was not paying
+      attention to any local part prefix or suffix that was matched by the
+      router that accepted the address. It now behaves in the same way as it
+      does for delivery: the affixes are removed from the local part unless
+      rcpt_include_affixes is set on the transport.
+
+PH/32 Add the sender address, as F=<...>, to the log line when logging a
+      timeout during the DATA phase of an incoming message.
+
+PH/33 Sieve envelope tests were broken for match types other than :is. I have
+      applied a patch sanctioned by the Sieve maintainer.
+
+PH/34 Change 4.50/80 broke Exim in that it could no longer handle cases where
+      the uid or gid is negative. A case of a negative gid caused this to be
+      noticed. The fix allows for either to be negative.
+
+PH/35 ACL_WHERE_MIME is now declared unconditionally, to avoid too much code
+      clutter, but the tables that are indexed by ACL_WHERE_xxx values had been
+      overlooked.
+
+PH/36 The change PH/12 above was broken. Fixed it.
+
+PH/37 Exim used to check for duplicate addresses in the middle of routing, on
+      the grounds that routing the same address twice would always produce the
+      same answer. This might have been true once, but it is certainly no
+      longer true now. Routing a child address may depend on the previous
+      routing that produced that child. Some complicated redirection strategies
+      went wrong when messages had multiple recipients, and made Exim's
+      behaviour dependent on the order in which the addresses were given.
+
+      I have moved the duplicate checking until after the routing is complete.
+      Exim scans the addresses that are assigned to local and remote
+      transports, and removes any duplicates. This means that more work will be
+      done, as duplicates will always all be routed, but duplicates are
+      presumably rare, so I don't expect this is of any significance.
+
+      For deliveries to pipes, files, and autoreplies, the duplicate checking
+      still happens during the routing process, since they are not going to be
+      routed further.
+
+PH/38 Installed a patch from Ian Freislich, with the agreement of Tom Kistner.
+      It corrects a timeout issue with spamd. This is Ian's comment: "The
+      background is that sometimes spamd either never reads data from a
+      connection it has accepted, or it never writes response data. The exiscan
+      spam.[ch] uses a 3600 second timeout on spamd socket reads, further, it
+      blindly assumes that writes won't block so it may never time out."
+
+PH/39 Allow G after quota size as well as K and M.
+
+PH/40 The value set for $authenticated_id in an authenticator may not contain
+      binary zeroes or newlines because the value is written to log lines and
+      to spool files. There was no check on this. Now the value is run through
+      the string_printing() function so that such characters are converted to
+      printable escape sequences.
+
+PH/41 $message_linecount is a new variable that contains the total number of
+      lines in the message. Compare $body_linecount, which is the count for the
+      body only.
+
+PH/42 Exim no longer gives details of delivery errors for specific addresses in
+      bounce and delay warning messages, except in certain special cases, which
+      are as follows:
+
+      (a) An SMTP error message from a remote host;
+      (b) A message specified in a :fail: redirection;
+      (c) A message specified in a "fail" command in a system filter;
+      (d) A message specified in a FAIL return from the queryprogram router;
+      (e) A message specified by the cannot_route_message router option.
+
+      In these cases only, Exim does include the error details in bounce and
+      warning messages. There are also a few cases where bland messages such
+      as "unrouteable address" or "local delivery error" are given.
+
+PH/43 $value is now also set for the "else" part of a ${run expansion.
+
+PH/44 Applied patch from the Sieve maintainer: "The vacation draft is still
+      being worked on, but at least Exim now implements the latest version to
+      play with."
+
+PH/45 In a pipe transport, although a timeout while waiting for the pipe
+      process to complete was treated as a delivery failure, a timeout while
+      writing the message to the pipe was logged, but erroneously treated as a
+      successful delivery. Such timeouts include transport filter timeouts. For
+      consistency with the overall process timeout, these timeouts are now
+      treated as errors, giving rise to delivery failures by default. However,
+      there is now a new Boolean option for the pipe transport called
+      timeout_defer, which, if set TRUE, converts the failures into defers for
+      both kinds of timeout. A transport filter timeout is now identified in
+      the log output.
+
+PH/46 The "scripts/Configure-config.h" script calls "make" at one point. On
+      systems where "make" and "gmake" are different, calling "gmake" at top
+      level broke things. I've arranged for the value of $(MAKE) to be passed
+      from the Makefile to this script so that it can call the same version of
+      "make".
+
+
+A note about Exim versions 4.44 and 4.50
+----------------------------------------
+
+Exim 4.50 was meant to be the next release after 4.43. It contains a lot of
+changes of various kinds. As a consequence, a big documentation update was
+needed. This delayed the release for rather longer than seemed good, especially
+in the light of a couple of (minor) security issues. Therefore, the changes
+that fixed bugs were backported into 4.43, to create a 4.44 maintenance
+release. So 4.44 and 4.50 are in effect two different branches that both start
+from 4.43.
+
+I have left the 4.50 change log unchanged; it contains all the changes since
+4.43. The change log for 4.44 is below; many of its items are identical to
+those for 4.50. This seems to be the most sensible way to preserve the
+historical information.
+
+
+Exim version 4.50
 -----------------
 
  1. Minor wording change to the doc/README.SIEVE file.
@@ -16,6 +362,557 @@ Exim version 4.44
     bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
     place.
 
+ 4. Give more explanation in the error message when the command for a transport
+    filter fails to execute.
+
+ 5. There are several places where Exim runs a non-Exim command in a
+    subprocess. The SIGUSR1 signal should be disabled for these processes. This
+    was being done only for the command run by the queryprogram router. It is
+    now done for all such subprocesses. The other cases are: ${run, transport
+    filters, and the commands run by the lmtp and pipe transports.
+
+ 6. Added CONFIGURE_GROUP build-time option.
+
+ 7. Some older OS have a limit of 256 on the maximum number of file
+    descriptors. Exim was using setrlimit() to set 1000 as a large value
+    unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
+    systems. I've change it so that if it can't get 1000, it tries for 256.
+
+ 8. "control=submission" was allowed, but had no effect, in a DATA ACL. This
+    was an oversight, and furthermore, ever since the addition of extra
+    controls (e.g. 4.43/32), the checks on when to allow different forms of
+    "control" were broken. There should now be diagnostics for all cases when a
+    control that does not make sense is encountered.
+
+ 9. Added the /retain_sender option to "control=submission".
+
+10. $recipients is now available in the predata ACL (oversight).
+
+11. Tidy the search cache before the fork to do a delivery from a message
+    received from the command line. Otherwise the child will trigger a lookup
+    failure and thereby defer the delivery if it tries to use (for example) a
+    cached ldap connection that the parent has called unbind on.
+
+12. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
+    of $address_data from the recipient verification was clobbered by the
+    sender verification.
+
+13. The value of address_data from a sender verification is now available in
+    $sender_address_data in subsequent conditions in the ACL statement.
+
+14. Added forbid_sieve_filter and forbid_exim_filter to the redirect router.
+
+15. Added a new option "connect=<time>" to callout options, to set a different
+    connection timeout.
+
+16. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
+    was its contents. (It was OK if the option was not defined at all.)
+
+17. A "Completed" log line is now written for messages that are removed from
+    the spool by the -Mrm option.
+
+18. New variables $sender_verify_failure and $recipient_verify_failure contain
+    information about exactly what failed.
+
+19. Added -dd to debug only the daemon process.
+
+20. Incorporated Michael Haardt's patch to ldap.c for improving the way it
+    handles timeouts, both on the server side and network timeouts. Renamed the
+    CONNECT parameter as NETTIMEOUT (but kept the old name for compatibility).
+
+21. The rare case of EHLO->STARTTLS->HELO was setting the protocol to "smtp".
+    It is now set to "smtps".
+
+22. $host_address is now set to the target address during the checking of
+    ignore_target_hosts.
+
+23. When checking ignore_target_hosts for an ipliteral router, no host name was
+    being passed; this would have caused $sender_host_name to have been used if
+    matching the list had actually called for a host name (not very likely,
+    since this list is usually IP addresses). A host name is now passed as
+    "[x.x.x.x]".
+
+24. Changed the calls that set up the SIGCHLD handler in the daemon to use the
+    code that specifies a non-restarting handler (typically sigaction() in
+    modern systems) in an attempt to fix a rare and obscure crash bug.
+
+25. Narrowed the window for a race in the daemon that could cause it to ignore
+    SIGCHLD signals. This is not a major problem, because they are used only to
+    wake it up if nothing else does.
+
+26. A malformed maildirsize file could cause Exim to calculate negative values
+    for the mailbox size or file count. Odd effects could occur as a result.
+    The maildirsize information is now recalculated if the size or filecount
+    end up negative.
+
+27. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
+    support for a long time. Removed HAVE_SYS_VFS_H.
+
+28. Installed the latest version of exipick from John Jetmore.
+
+29. In an address list, if the pattern was not a regular expression, an empty
+    subject address (from a bounce message) matched only if the pattern was an
+    empty string. Non-empty patterns were not even tested. This was the wrong
+    because it is perfectly reasonable to use an empty address as part of a
+    database query. An empty address is now tested by patterns that are
+    lookups. However, all the other forms of pattern expect the subject to
+    contain a local part and a domain, and therefore, for them, an empty
+    address still always fails if the pattern is not itself empty.
+
+30. Exim went into a mad DNS loop when attempting to do a callout where the
+    host was specified on an smtp transport, and looking it up yielded more
+    than one IP address.
+
+31. Re-factored the code for checking spool and log partition space into a
+    function that finds that data and another that does the check. The former
+    is then used to implement four new variables: $spool_space, $log_space,
+    $spool_inodes, and $log_inodes.
+
+32. The RFC2047 encoding function was originally intended for short strings
+    such as real names; it was not keeping to the 75-character limit for
+    encoded words that the RFC imposes. It now respects the limit, and
+    generates multiple encoded words if necessary. To be on the safe side, I
+    have increased the buffer size for the ${rfc2047: expansion operator from
+    1024 to 2048 bytes.
+
+33. It is now permitted to omit both strings after an "if" condition; if the
+    condition is true, the result is "true". As before, when the second string
+    is omitted, a false condition yields an empty string. This makes it less
+    cumbersome to write custom ACL and router conditions.
+
+34. Failure to deliver a bounce message always caused it to be frozen, even if
+    there was an errors_to setting on the router. The errors_to setting is now
+    respected.
+
+35. If an IPv6 address is given for -bh or -bhc, it is now converted to the
+    canonical form (fully expanded) before being placed in
+    $sender_host_address.
+
+36. The table in the code that translates DNS record types into text (T_A to
+    "A" for instance) was missing entries for NS and CNAME. It is just possible
+    that this could have caused confusion if both these types were looked up
+    for the same domain, because the text type is used as part of Exim's
+    per-process caching. But the chance of anyone hitting this buglet seems
+    very small.
+
+37. The dnsdb lookup has been extended in a number of ways.
+
+    (1) There is a new type, "zns", which walks up the domain tree until it
+        finds some nameserver records. It should be used with care.
+
+    (2) There is a new type, "mxh", which is like "mx" except that it returns
+        just the host names, not the priorities.
+
+    (3) It is now possible to give a list of domains (or IP addresses) to be
+        looked up. The behaviour when one of the lookups defers can be
+        controlled by a keyword.
+
+    (4) It is now possible to specify the separator character for use when
+        multiple records are returned.
+
+38. The dnslists ACL condition has been extended: it is now possible to supply
+    a list of IP addresses and/or domains to be looked up in a particular DNS
+    domain.
+
+39. Added log_selector=+queue_time_overall.
+
+40. When running the queue in the test harness, wait just a tad after forking a
+    delivery process, to get repeatability of debugging output.
+
+41. Include certificate and key file names in error message when GnuTLS fails
+    to set them up, because the GnuTLS error message doesn't include the name
+    of the failing file when there is a problem reading it.
+
+42. Allow both -bf and -bF in the same test run.
+
+43. Did the same fix as 41 above for OpenSSL, which had the same infelicity.
+
+44. The "Exiscan patch" is now merged into the mainline Exim source.
+
+45. Sometimes the final signoff response after QUIT could fail to get
+    transmitted in the non-TLS case. Testing !tls_active instead of tls_active
+    < 0 before doing a fflush(). This bug looks as though it goes back to the
+    introduction of TLS in release 3.20, but "sometimes" must have been rare
+    because the tests only now provoked it.
+
+46. Reset the locale to "C" after calling embedded Perl, in case it was changed
+    (this can affect the format of dates).
+
+47. exim_tidydb, when checking for the continued existence of a message for
+    which it has found a message-specific retry record, was not finding
+    messages that were in split spool directories. Consequently, it was
+    deleting retry records that should have stayed in existence.
+
+48. Steve fixed some bugs in eximstats.
+
+49. The SPA authentication driver was not abandoning authentication and moving
+    on to the next authenticator when an expansion was forced to fail,
+    contradicting the general specification for all authenticators. Instead it
+    was generating a temporary error. It now behaves as specified.
+
+50. The default ordering of permitted cipher suites for GnuTLS was pessimal
+    (the order specifies the preference for clients). The order is now AES256,
+    AES128, 3DES, ARCFOUR128.
+
+51. Small patch to Sieve code - explicitly set From: when generating an
+    autoreply.
+
+52. Exim crashed if a remote delivery caused a very long error message to be
+    recorded - for instance if somebody sent an entire SpamAssassin report back
+    as a large number of 550 error lines. This bug was coincidentally fixed by
+    increasing the size of one of Exim's internal buffers (big_buffer) that
+    happened as part of the Exiscan merge. However, to be on the safe side, I
+    have made the code more robust (and fixed the comments that describe what
+    is going on).
+
+53. Now that there can be additional text after "Completed" in log lines (if
+    the queue_time_overall log selector is set), a one-byte patch to exigrep
+    was needed to allow it to recognize "Completed" as not the last thing in
+    the line.
+
+54. The LDAP lookup was not handling a return of LDAP_RES_SEARCH_REFERENCE. A
+    patch that reportedly fixes this has been added. I am not expert enough to
+    create a test for it. This is what the patch creator wrote:
+
+      "I found a little strange behaviour of ldap code when working with
+      Windows 2003 AD Domain, where users was placed in more than one
+      Organization Units. When I tried to give exim partial DN, the exit code
+      of ldap_search was unknown to exim because of LDAP_RES_SEARCH_REFERENCE.
+      But simultaneously result of request was absolutely normal ldap result,
+      so I produce this patch..."
+
+    Later: it seems that not all versions of LDAP support LDAP_RES_SEARCH_
+    REFERENCE, so I have modified the code to exclude the patch when that macro
+    is not defined.
+
+55. Some experimental protocols are using DNS PTR records for new purposes. The
+    keys for these records are domain names, not reversed IP addresses. The
+    dnsdb PTR lookup now tests whether its key is an IP address. If not, it
+    leaves it alone. Component reversal etc. now happens only for IP addresses.
+    CAN-2005-0021
+
+56. Improve error message when ldap_search() fails in OpenLDAP or Solaris LDAP.
+
+57. Double the size of the debug message buffer (to 2048) so that more of very
+    long debug lines gets shown.
+
+58. The exicyclog utility now does better if the number of log files to keep
+    exceeds 99. In this case, it numbers them 001, 002 ... instead of 01, 02...
+
+59. Two changes related to the smtp_active_hostname option:
+
+      (1) $smtp_active_hostname is now available as a variable.
+      (2) The default for smtp_banner uses $smtp_active_hostname instead
+          of $primary_hostname.
+
+60. The host_aton() function is supposed to be passed a string that is known
+    to be a valid IP address. However, in the case of IPv6 addresses, it was
+    not checking this. This is a hostage to fortune. Exim now panics and dies
+    if the condition is not met. A case was found where this could be provoked
+    from a dnsdb PTR lookup with an IPv6 address that had more than 8
+    components; fortuitously, this particular loophole had already been fixed
+    by change 4.50/55 above.
+
+    If there are any other similar loopholes, the new check in host_aton()
+    itself should stop them being exploited. The report I received stated that
+    data on the command line could provoke the exploit when Exim was running as
+    exim, but did not say which command line option was involved. All I could
+    find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
+    running as the user.
+    CAN-2005-0021
+
+61. There was a buffer overflow vulnerability in the SPA authentication code
+    (which came originally from the Samba project). I have added a test to the
+    spa_base64_to_bits() function which I hope fixes it.
+    CAN-2005-0022
+
+62. Configuration update for GNU/Hurd and variations. Updated Makefile-GNU and
+    os.h-GNU, and added configuration files for GNUkFreeBSD and GNUkNetBSD.
+
+63. The daemon start-up calls getloadavg() while still root for those OS that
+    need the first call to be done as root, but it missed one case: when
+    deliver_queue_load_max is set with deliver_drop_privilege. This is
+    necessary for the benefit of the queue runner, because there is no re-exec
+    when deliver_drop_privilege is set.
+
+64. A call to exiwhat cut short delays set up by "delay" modifiers in ACLs.
+    This has been fixed.
+
+65. Caching of lookup data for "hosts =" ACL conditions, when a named host list
+    was in use, was not putting the data itself into the right store pool;
+    consequently, it could be overwritten for a subsequent message in the same
+    SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
+    the caching.)
+
+66. Added hosts_max_try_hardlimit to the smtp transport, default 50.
+
+67. The string_is_ip_address() function returns 0, 4, or 6, for "no an IP
+    address", "IPv4 address", and "IPv6 address", respectively. Some calls of
+    the function were treating the return as a boolean value, which happened to
+    work because 0=false and not-0=true, but is not correct code.
+
+68. The host_aton() function was not handling scoped IPv6 addresses (those
+    with, for example, "%eth0" on the end) correctly.
+
+69. Fixed some compiler warnings in acl.c for the bitmaps specified with
+    negated items (that is, ~something) in unsigned ints. Some compilers
+    apparently mutter when there is no cast.
+
+70. If an address verification called from an ACL failed, and did not produce a
+    user-specific message (i.e. there was only a "system" message), nothing was
+    put in $acl_verify_message. In this situation, it now puts the system
+    message there.
+
+71. Change 4.23/11 added synchronization checking at the start of an SMTP
+    session; change 4.31/43 added the unwanted input to the log line - except
+    that it did not do this in the start of session case. It now does.
+
+72. After a timeout in a callout SMTP session, Exim still sent a QUIT command.
+    This is wrong and can cause the other end to generate a synchronization
+    error if it is another Exim or anything else that does the synchronization
+    check. A QUIT command is no longer sent after a timeout.
+
+73. $host_lookup_deferred has been added, to make it easier to detect DEFERs
+    during host lookups.
+
+74. The defer_ok option of callout verification was not working if it was used
+    when verifying addresses in header lines, that is, for this case:
+
+      verify = header_sender/callout=defer_ok
+
+75. A backgrounded daemon closed stdin/stdout/stderr on entry; this meant that
+    those file descriptors could be used for SMTP connections. If anything
+    wrote to stderr (the example that came up was "warn" in embedded Perl), it
+    could be sent to the SMTP client, causing chaos. The daemon now opens
+    stdin, stdout, and stderr to /dev/null when it puts itself into the
+    background.
+
+76. Arrange for output from Perl's "warn" command to be written to Exim's main
+    log by default. The user can override this with suitable Perl magic.
+
+77. The use of log_message on a "discard" ACL verb, which is supposed to add to
+    the log message when discard triggers, was not working for the DATA ACL or
+    for the non-SMTP ACL.
+
+78. Error message wording change in sieve.c.
+
+79. If smtp_accept_max_per_host was set, the number of connections could be
+    restricted to fewer than expected, because the daemon was trying to set up
+    a new connection before checking whether the processes handling previous
+    connections had finished. The check for completed processes is now done
+    earlier. On busy systems, this bug wouldn't be noticed because something
+    else would have woken the daemon, and it would have reaped the completed
+    process earlier.
+
+80. If a message was submitted locally by a user whose login name contained one
+    or more spaces (ugh!), the spool file that Exim wrote was not re-readable.
+    It caused a spool format error. I have fixed the spool reading code. A
+    related problem was that the "from" clause in the Received: line became
+    illegal because of the space(s). It is now covered by ${quote_local_part.
+
+81. Included the latest eximstats from Steve (adds average sizes to HTML Top
+    tables).
+
+82. Updated OS/Makefile-AIX as per message from Mike Meredith.
+
+83. Patch from Sieve maintainer to fix unterminated string problem in
+    "vacation" handling.
+
+84. Some minor changes to the Linux configuration files to help with other
+    OS variants using glibc.
+
+85. One more patch for Sieve to update vacation handling to latest spec.
+
+
+----------------------------------------------------
+See the note above about the 4.44 and 4.50 releases.
+----------------------------------------------------
+
+
+Exim version 4.44
+-----------------
+
+ 1. Change 4.43/35 introduced a bug that caused file counts to be
+    incorrectly computed when quota_filecount was set in an appendfile
+    transport
+
+ 2. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
+    bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
+    place.
+
+ 3. Give more explanation in the error message when the command for a transport
+    filter fails to execute.
+
+ 4. There are several places where Exim runs a non-Exim command in a
+    subprocess. The SIGUSR1 signal should be disabled for these processes. This
+    was being done only for the command run by the queryprogram router. It is
+    now done for all such subprocesses. The other cases are: ${run, transport
+    filters, and the commands run by the lmtp and pipe transports.
+
+ 5. Some older OS have a limit of 256 on the maximum number of file
+    descriptors. Exim was using setrlimit() to set 1000 as a large value
+    unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
+    systems. I've change it so that if it can't get 1000, it tries for 256.
+
+ 6. "control=submission" was allowed, but had no effect, in a DATA ACL. This
+    was an oversight, and furthermore, ever since the addition of extra
+    controls (e.g. 4.43/32), the checks on when to allow different forms of
+    "control" were broken. There should now be diagnostics for all cases when a
+    control that does not make sense is encountered.
+
+ 7. $recipients is now available in the predata ACL (oversight).
+
+ 8. Tidy the search cache before the fork to do a delivery from a message
+    received from the command line. Otherwise the child will trigger a lookup
+    failure and thereby defer the delivery if it tries to use (for example) a
+    cached ldap connection that the parent has called unbind on.
+
+ 9. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
+    of $address_data from the recipient verification was clobbered by the
+    sender verification.
+
+10. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
+    was its contents. (It was OK if the option was not defined at all.)
+
+11. A "Completed" log line is now written for messages that are removed from
+    the spool by the -Mrm option.
+
+12. $host_address is now set to the target address during the checking of
+    ignore_target_hosts.
+
+13. When checking ignore_target_hosts for an ipliteral router, no host name was
+    being passed; this would have caused $sender_host_name to have been used if
+    matching the list had actually called for a host name (not very likely,
+    since this list is usually IP addresses). A host name is now passed as
+    "[x.x.x.x]".
+
+14. Changed the calls that set up the SIGCHLD handler in the daemon to use the
+    code that specifies a non-restarting handler (typically sigaction() in
+    modern systems) in an attempt to fix a rare and obscure crash bug.
+
+15. Narrowed the window for a race in the daemon that could cause it to ignore
+    SIGCHLD signals. This is not a major problem, because they are used only to
+    wake it up if nothing else does.
+
+16. A malformed maildirsize file could cause Exim to calculate negative values
+    for the mailbox size or file count. Odd effects could occur as a result.
+    The maildirsize information is now recalculated if the size or filecount
+    end up negative.
+
+17. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
+    support for a long time. Removed HAVE_SYS_VFS_H.
+
+18. Updated exipick to current release from John Jetmore.
+
+19. Allow an empty sender to be matched against a lookup in an address list.
+    Previously the only cases considered were a regular expression, or an
+    empty pattern.
+
+20. Exim went into a mad DNS lookup loop when doing a callout where the
+    host was specified on the transport, if the DNS lookup yielded more than
+    one IP address.
+
+21. The RFC2047 encoding function was originally intended for short strings
+    such as real names; it was not keeping to the 75-character limit for
+    encoded words that the RFC imposes. It now respects the limit, and
+    generates multiple encoded words if necessary. To be on the safe side, I
+    have increased the buffer size for the ${rfc2047: expansion operator from
+    1024 to 2048 bytes.
+
+22. Failure to deliver a bounce message always caused it to be frozen, even if
+    there was an errors_to setting on the router. The errors_to setting is now
+    respected.
+
+23. If an IPv6 address is given for -bh or -bhc, it is now converted to the
+    canonical form (fully expanded) before being placed in
+    $sender_host_address.
+
+24. Updated eximstats to version 1.33
+
+25. Include certificate and key file names in error message when GnuTLS fails
+    to set them up, because the GnuTLS error message doesn't include the name
+    of the failing file when there is a problem reading it.
+
+26. Expand error message when OpenSSL has problems setting up cert/key files.
+    As per change 25.
+
+27. Reset the locale to "C" after calling embedded Perl, in case it was changed
+    (this can affect the format of dates).
+
+28. exim_tidydb, when checking for the continued existence of a message for
+    which it has found a message-specific retry record, was not finding
+    messages that were in split spool directories. Consequently, it was
+    deleting retry records that should have stayed in existence.
+
+29. eximstats updated to version 1.35
+    1.34 - allow eximstats to parse syslog lines as well as mainlog lines
+    1.35 - bugfix such that pie charts by volume are generated correctly
+
+30. The SPA authentication driver was not abandoning authentication and moving
+    on to the next authenticator when an expansion was forced to fail,
+    contradicting the general specification for all authenticators. Instead it
+    was generating a temporary error. It now behaves as specified.
+
+31. The default ordering of permitted cipher suites for GnuTLS was pessimal
+    (the order specifies the preference for clients). The order is now AES256,
+    AES128, 3DES, ARCFOUR128.
+
+31. Small patch to Sieve code - explicitly set From: when generating an
+    autoreply.
+
+32. Exim crashed if a remote delivery caused a very long error message to be
+    recorded - for instance if somebody sent an entire SpamAssassin report back
+    as a large number of 550 error lines. This bug was coincidentally fixed by
+    increasing the size of one of Exim's internal buffers (big_buffer) that
+    happened as part of the Exiscan merge. However, to be on the safe side, I
+    have made the code more robust (and fixed the comments that describe what
+    is going on).
+
+33. Some experimental protocols are using DNS PTR records for new purposes. The
+    keys for these records are domain names, not reversed IP addresses. The
+    dnsdb PTR lookup now tests whether its key is an IP address. If not, it
+    leaves it alone. Component reversal etc. now happens only for IP addresses.
+    CAN-2005-0021
+
+34. The host_aton() function is supposed to be passed a string that is known
+    to be a valid IP address. However, in the case of IPv6 addresses, it was
+    not checking this. This is a hostage to fortune. Exim now panics and dies
+    if the condition is not met. A case was found where this could be provoked
+    from a dnsdb PTR lookup with an IPv6 address that had more than 8
+    components; fortuitously, this particular loophole had already been fixed
+    by change 4.50/55 or 4.44/33 above.
+
+    If there are any other similar loopholes, the new check in host_aton()
+    itself should stop them being exploited. The report I received stated that
+    data on the command line could provoke the exploit when Exim was running as
+    exim, but did not say which command line option was involved. All I could
+    find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
+    running as the user.
+    CAN-2005-0021
+
+35. There was a buffer overflow vulnerability in the SPA authentication code
+    (which came originally from the Samba project). I have added a test to the
+    spa_base64_to_bits() function which I hope fixes it.
+    CAN-2005-0022
+
+36. The daemon start-up calls getloadavg() while still root for those OS that
+    need the first call to be done as root, but it missed one case: when
+    deliver_queue_load_max is set with deliver_drop_privilege. This is
+    necessary for the benefit of the queue runner, because there is no re-exec
+    when deliver_drop_privilege is set.
+
+37. Caching of lookup data for "hosts =" ACL conditions, when a named host list
+    was in use, was not putting the data itself into the right store pool;
+    consequently, it could be overwritten for a subsequent message in the same
+    SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
+    the caching.)
+
+38. Sometimes the final signoff response after QUIT could fail to get
+    transmitted in the non-TLS case. Testing !tls_active instead of tls_active
+    < 0 before doing a fflush(). This bug looks as though it goes back to the
+    introduction of TLS in release 3.20, but "sometimes" must have been rare
+    because the tests only now provoked it.
+
 
 Exim version 4.43
 -----------------