v2.2.26 released

[Timo Sirainen]

http://dovecot.org/releases/2.2/dovecot-2.2.26.tar.gz
http://dovecot.org/releases/2.2/dovecot-2.2.26.tar.gz.sig

There were some changes since rc1: https://github.com/dovecot/core/commit/54d654098032d96975b70749b505fae538e97f7a
Mainly there are quite a lot of director fixes and improvements.

Here's the full list of changes:

 * master: Removed hardcoded 511 backlog limit for listen(). The kernel
   should limit this as needed.
 * doveadm import: Source user is now initialized the same as target
   user. Added -U parameter to override the source user.
 * Mailbox names are no longer limited to 16 hierarchy levels. We'll
   check another way to make sure mailbox names can't grow larger than
   4096 bytes.

 + Added a concept of "alternative usernames" by returning user_* extra
   field(s) in passdb. doveadm proxy list shows these alt usernames in
   "doveadm proxy list" output. "doveadm director&proxy kick" adds
   -f <passdb field> parameter. The alt usernames don't have to be
   unique, so this allows creation of user groups and kicking them in
   one command.
 + auth: passdb/userdb dict allows now %variables in key settings.
 + auth: If passdb returns noauthenticate=yes extra field, assume that
   it only set extra fields and authentication wasn't actually performed.
 + auth: passdb static now supports password={scheme} prefix.
 + auth, login_log_format_elements: Added %{local_name} variable, which
   expands to TLS SNI hostname if given.
 + imapc: Added imapc_max_line_length to limit maximum memory usage.
 + imap, pop3: Added rawlog_dir setting to store IMAP/POP3 traffic logs.
   This replaces at least partially the rawlog plugin.
 + dsync: Added dsync_features=empty-header-workaround setting. This
   makes incremental dsyncs work better for servers that randomly return
   empty headers for mails. When an empty header is seen for an existing
   mail, dsync assumes that it matches the local mail.
 + doveadm sync/backup: Added -I <max size> parameter to skip too
   large mails.
 + doveadm sync/backup: Fixed -t parameter and added -e for "end date".
 + doveadm mailbox metadata: Added -s parameter to allow accessing
   server metadata by using empty mailbox name.
 + Added "doveadm service status" and "doveadm process status" commands.
 + director: Added director_flush_socket. See
   http://wiki2.dovecot.org/Director#Flush_socket
 + doveadm director flush: Users are now moved only max 100 at a time to
   avoid load spikes. --max-parallel parameter overrides this.
 + Added FILE_LOCK_SLOW_WARNING_MSECS environment, which logs a warning
   if any lock is waited on or kept for this many milliseconds.

 - master process's listener socket was leaked to all child processes.
   This might have allowed untrusted processes to capture and prevent
   "doveadm service stop" comands from working.
 - login proxy: Fixed crash when outgoing SSL connections were hanging.
 - auth: userdb fields weren't passed to auth-workers, so %{userdb:*}
   from previous userdbs didn't work there.
 - auth: Each userdb lookup from cache reset its TTL.
 - auth: Fixed auth_bind=yes + sasl_bind=yes to work together
 - auth: Blocking userdb lookups reset extra fields set by previous
   userdbs.
 - auth: Cache keys didn't include %{passdb:*} and %{userdb:*}
 - auth-policy: Fixed crash due to using already-freed memory if policy
   lookup takes longer than auth request exists.
 - lib-auth: Unescape passdb/userdb extra fields. Mainly affected
   returning extra fields with LFs or TABs.
 - lmtp_user_concurrency_limit>0 setting was logging unnecessary
   anvil errors.
 - lmtp_user_concurrency_limit is now checked before quota check with
   lmtp_rcpt_check_quota=yes to avoid unnecessary quota work.
 - lmtp: %{userdb:*} variables didn't work in mail_log_prefix
 - autoexpunge settings for mailboxes with wildcards didn't work when
   namespace prefix was non-empty.
 - Fixed writing >2GB to iostream-temp files (used by fs-compress,
   fs-metawrap, doveadm-http)
 - director: Ignore duplicates in director_servers setting.
 - director: Many fixes related to connection handshaking, user moving
   and error handling.
 - director: Don't break with shutdown_clients=no
 - zlib, IMAP BINARY: Fixed internal caching when accessing multiple
   newly created mails. They all had UID=0 and the next mail could have
   wrongly used the previously cached mail.
 - doveadm stats reset wasn't reseting all the stats.
 - auth_stats=yes: Don't update num_logins, since it doubles them when
   using with mail stats.
 - quota count: Fixed deadlocks when updating vsize header.
 - dict-quota: Fixed crashes happening due to memory corruption.
 - dict proxy: Fixed various timeout-related bugs.
 - doveadm proxying: Fixed -A and -u wildcard handling.
 - doveadm proxying: Fixed hangs and bugs related to printing.
 - imap: Fixed wrongly triggering assert-crash in
   client_check_command_hangs.
 - imap proxy: Don't send ID command pipelined with nopipelining=yes
 - imap-hibernate: Don't execute quota_over_script or last_login after
   un-hibernation.
 - imap-hibernate: Don't un-hibernate if client sends DONE+IDLE in one
   IP packet.
 - imap-hibernate: Fixed various failures when un-hibernating.
 - fts: fts_autoindex=yes was broken in 2.2.25 unless
   fts_autoindex_exclude settings existed.
 - fts-solr: Fixed searching multiple mailboxes (patch by x16a0)
 - doveadm fetch body.snippet wasn't working in 2.2.25. Also fixed a
   crash with certain emails.
 - pop3-migration + dbox: Various fixes related to POP3 UIDL
   optimization in 2.2.25.
 - pop3-migration: Fixed "truncated email header" workaround.