annotate TODO @ 5621:eba408782747 HEAD

updated
author Timo Sirainen <tss@iki.fi>
date Mon, 14 May 2007 02:03:07 +0300
parents 657406346288
children 8f79b333fc47
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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5621
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1 POP3(username): UID larger than next_uid in file /home/username/Maildir/dovecot-uidlist (1 >= 1)
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2 - 229 (1 >= 1) 44 (2 >= 2) 3 (3 >= 3) 1 (7 >= 7)
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3
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4 POP3(xxxxx@xxxxxxx): file maildir-sync.c: line 1075 (maildir_sync_index): assertion failed: (uid > prev_uid)
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5
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6 - v1.1:
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7 - IMAP ACL / shared mailboxes support
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8 - subscriptions
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9 - is it useful to subscribe to a namespace prefix?
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10 - mailbox list index for fs layout
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11 - quota: delay counting the quota until it's really needed
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12
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13 - rquotad support for FS quota
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14 - logging
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15 - consistency: http://www.dovecot.org/list/dovecot/2007-April/021532.html
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16 - add imap_logout_format
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17 - number of bytes sent
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18 - If dovecot.index.log has EXPUNGE command but mailbox is read-only it won't
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19 get fixed by itself.
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20 - EXPUNGE command in read-only mailbox should give an error message if
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21 there are messages marked as \Deleted?
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22 - dovecot -o setting=something overriding
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23 - don't use squat with header if index doesn't exist
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24 - don't use squat index if searching only a couple of mails
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25 - Send local/remote ports to dovecot-auth
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26 - vmailmgr patch
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27 - managesieve patch
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28 - cache-while-saving doesn't work with mbox/dbox
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29 - threading: (all done?)
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30 - duplicate: mark original as rebuild
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31 - re-parent (also reparenting to root): mark as rebuild
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32 - unref: if refcount drops to zero, set children's parent=0 (can happen
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33 if there are only grandchildren and dummy children)
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34 - mail-hash: stat() and reopen if needed
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35 - subjects: group roots togethere already while gathering subjects. then
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36 go through them and sort them to get their sent date. then start writing
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37 the nodes out. sorting needs to these cases:
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38 1) root is dummy -> just sort their children. if there are dummies
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39 they're skipped and their children ascend
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40 2) root is non-dummy -> there are no dummies at all in the thread.
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41 the root has the oldest date in the thread. after the root if there
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42 are re: or fwd: messages they're children to the root. if there are
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43 more messages after that, a new dummy parent needs to be created,
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44 and the rest of the messages need to be sorted before sending
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45
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46 - mmap_disable: updated cache header doesn't invalidate other processes' cache?
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47 - mail_index_move_to_memory() should lock the index..
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48 - mbox: UID renumbering doesn't really work after all?
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49 - maildir: we could finish writing dovecot-uidlist.lock before rename()ing
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50 any files from tmp/, so if it fails we'll abort the mail saving
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51 - file_cache: we're growing the mmap in page size blocks, which is horribly
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52 slow if mremap() doesn't exist.
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53 - login_max_processes_count shouldn't count proxying processes
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54 - maildir_copy_with_hardlinks: We're currently first hardlinking to tmp/ and
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55 then rename()ing. This wouldn't be necessary if uidlist syncing noticed
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56 that someone else already had added them to uidlist, and the existing UIDs
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57 could be assigned to them in the index.
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58 - maildir_copy_preserve_filename=yes has a race condition causing "Append with
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59 UID n, but next_uid = y" errors when quota plugin is loaded. Practically
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60 won't happen except in stress testing.
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61 - maildir_copy_with_hardlinks=yes is problematic with shared folders where
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62 the file mode should change..
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63 - still problems with CRLF mboxes..
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64
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65 - Allow %variables in mail_chroot setting
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66 - something should be done to umask setting. we should be creating files with
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67 0666 or 0777 and rely on umask, but we shouldn't do that unless we're sure
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68 that the umask is the wanted one (ie. imap/pop3 process wasn't started
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69 directly)
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70 - filesystem group quota patch
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71 - ssl_verify_client_cert isn't working if the SSL cert doesn't have CRL
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72
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73 - keywords:
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74 - add some limits to how many there can be
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75 - don't return \* in PERMANENTFLAGS when we're full
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76 - remove unused keywords?
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77
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78 - caching
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79 - force bits should be used only for nonregistered fields
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80 - change envelope parsing not to use get_headers() so imap.envelope can
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81 actually be cached without all the headers..
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82 - compression should drop fields with last_used <
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83 (latest_mail_index_date - month)
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84 - we could try compressing same field values into a single
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85 location in cache file.
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86 - support caching all message headers. this could be useful when
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87 indexes are in local disk but actual mails are accessed through NFS.
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88
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89 - mbox
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90 - dirty state should be stored to index (with mbox_very_dirty_syncs)
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91 - after some locking timeouts: mbox-lock.c: line 518 (mbox_lock):
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92 assertion failed: (lock_type == F_RDLCK || mbox->mbox_lock_type != F_RDLCK)
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93 - controldir for mboxes too and place subscriptions file there?
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94 - size.physical isn't cached, but should it even be? ..
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95 - syncing existing indexes takes 4x longer than creating new one, why?
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96 - how well does dirty sync + status work? it reads the last mail every
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97 time? not very good..
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98 - always add empty line. make the parser require it too? syncing should
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99 make sure there always exists two LFs at end of file. raw-mbox-stream
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100 should make sure the last message ends with LF even if it doesn't exist
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101 in the file
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102 - Quote "From ", unquote ">From "
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103 - COPY doesn't work to itself (lock assert crash, for now just disallowed)
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104 - keep mbox lock for two extra seconds after sync (do we really need to?)
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105 - move /var/mail/user to ~/mbox if ~/mbox exists.. supposedly this
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106 could be useful if /var/mail doesn't have quota, but ~/mail does.
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107 now, what do we then do if we can move only some of the mails?..
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108 - if we can't create dotlock file for mbox, make sure it still can be
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109 selected in read-only state
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110
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111 - maildir
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112 - with pop3 don't move messages from new/ to cur/ before RETR
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113 - when sorting maildir files, sort based on Mxxxx first so the files are
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114 sorted always in ascending order. required for proper out-of-quota
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115 uidlist handling
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116 - physical separator could be configurable
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117
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118 - dbox
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119 - keyword list header locking isn't correct now. saving uses file's
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120 dotlock, sync uses sync lock. and what about reading?... (I think this
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121 is fixed?)
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122 - append_offset in header shouldn't be trusted
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123 - show in index if there are expunge-flagged mails in the mailbox
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124 - pop3_lock_session doesn't work
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125
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126 - index
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127 - dd if=/dev/zero of=dovecot.index bs=1024 count=1 -> NOOP -> crash!
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128 - delete >30min old dovecot.index.log.2 files when opening index?
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129 - optimize initial left_idx in _view_lookup_uid_range()
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130 - if log file is lost, generate it from old and new index
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131 - transaction log: when replacing log with a same sequence, we remove it
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132 from log's file list, but we don't do anything to existing log views.
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133 this can crash later in mail_transaction_log_view_set() because 'first'
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134 is from log list, while we're comparing it into view->tail which it never
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135 is. also overwriting it leaks memory..
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136 - read-only support for mailboxes where we don't have write-access
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137
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138 - namespaces
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139 - namespaces: add new "auto_disable" flag so if the mailbox can't be opened
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140 (eg. file doesn't exist), just ignore the problem and disable the
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141 namespace
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142 - subscribe <namespace prefix> doesn't work.
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143 - namespaces don't work in plugins: convert
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144 - subscriptions file should contain namespace prefixes. at least optionally.
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145 there's the subscriptions = yes setting now for namespaces.. do it so that
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146 if prefix = "" has subscriptions, it contains prefixes. otherwise not.
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147 - for shared/public namespaces default to "no"
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148
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149 - lib-storage
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150 - rename: allow moving between storages, as long as they're of same type
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151 - x search charset asdf all -> should fail
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152 - subscribe: IMAP(anonymous): open(anonymous/mail/.temp...) failed: Permission denied
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153 - should we allow following symlinks in mbox/maildirs? they are now.
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154 - if we implement shared mailboxes with shared indexes, never do that or
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155 others could symlink your personal mailboxes and see the indexes
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156 created for it which may contain envelope etc. data
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157 - this allows circular mailbox hierarchies which should be prevented by
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158 eg. allowing max. 20 hierarchies.
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159
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160 - login
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161 - when pipelining login command + post-login commands, login process should
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162 pass the command to imap/pop3 process (at least one pop3 client does this)
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163 - imap-login: Master sent reply with unknown tag 1. client closed
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164 connection at the exact same time master was logging it in?
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165 see master_request_abort()
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166 - Digest-MD5: support integrity protection, and maybe crypting. Do it
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167 through login process like SSL is done?
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168 - x login foo bar
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169 x NO Authentication failed.
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170 x login cras pass
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171 * BYE Disconnected for inactivity.
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172 ^ but it's not disconnecting! (buggy dovecot-auth not replying)
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173 probably because userdb lookup didn't reply, and fd was already sent
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174 for master.. should imap-login be handling it anymore?..
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175 - imap-login: Authenticate PLAIN failed: Authentication failed:
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176 Authentication server isn't connected, try again later.. [127.0.0.1]
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177 ^ NO Authentication failed. (should be Temporary login failure!)
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178 - if auth process dies, login process should retry authentication if
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179 possible. or if not, disconnect the client so it doesn't think the auth
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180 failed.
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181 - send client IP immediately after accept() to master process. make sure
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182 master shows the IP if login dies unexpectedly. master should probably
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183 also kill the login process if it doesn't kill itself soon enough.. or
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184 maybe just log the IP immediately.
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185
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186 - auth
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187 - uid_file and gid_file to get the uid/gid from given file's owner/group
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188 - ability to specify default password scheme with passwd-file
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189 - with blocking passdb we're not caching lookups if the password was wrong
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190 - non-plaintext authentication doesn't support all features:
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191 - multiple passdbs don't work, only the first one is used
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192 - auth cache's last_success password change check doesn't exist
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193 - if PAM child process doesn't finish within a minute, kill it
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194 - PAM / checkpassword should use passdb-blocking
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195 - remove system_user and allow returning multiple gids instead.
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196 - SIGHUP restarts auth processes .. but does it wait until they've finished
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197 with all requests? no.
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198 - does dovecot-auth really break when it runs out of fds?
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199 - dovecot-auth should limit how fast authentication requests are allowed
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200 from login processes. especially if there's one login/connection the speed
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201 should be something like once/sec. also limit how fast to accept new
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202 connections.
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203 - support read-only logins. user could with alternative password get only
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204 read-access to mails so mails could be read relatively safely with
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205 untrusted computers. Maybe always send [ALERT] about the previous
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206 read-only login time with IP?
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207 - dovecot-auth workers: create a separate dovecot-pam worker which shares
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208 pretty much all code with dovecot-auth worker but isn't linked against
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209 any libraries. or..? this might be difficult to do, especially because the
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210 workers currently can handle any kind of passdb/userb requests. perhaps
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211 there should be a completely separate simple PAM authenticator binary.
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212
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213 - master
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214 - Support listening in multiple sockets
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215 - per-user/ip limits..
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216 - configurable syslog prefix
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217 - SIGHUP rather shouldn't restart listening sockets if they didn't change..
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218 - if there are duplicate settings, complain about it
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219
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220 - quota
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221 - if dovecot-uidlist can't be written, assume the new mails have UIDs
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222 beginning from uidlist.next_uid. Whenever mails are expunged, overwrite
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223 the next_uid field with the current highest next_uid. Whenever we have
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224 assumed UIDs and uidlist gets updated, throw the client out with
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225 "inconsist mailbox".
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226 - if storage=0 is given, use unlimited quota but track it anyway
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227
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228 - ssl
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229 - add setting: ssl_options = bitmask. by default we enable all openssl
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230 workarounds, this could be used to disable some of them
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231 - gnutls support isn't working
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232
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233 - search
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234 - message header search: we should ignore LWSP between two MIME blocks
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235 - message_body_search() could accept multiple search keywords so we
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236 wouldn't need to call it separately for each one (so we wouldn't need
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237 to parse the message multiple times).
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238 - message_body_search() could support NULL MessagePart and the searching
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239 could be done while parsing the message. this would need changes to
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240 message_parse() as well.
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241 - could optionally support scanning inside file attachments and use
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242 plugins to extract text out of them (word, excel, pdf, etc. etc.)
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243 - use a trie index for fast text searching, like cyrus squat?
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244 - Create our own extension: When searching with TEXT/BODY, return
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245 the message text surrounding the keywords just like web search engines
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246 do. like: SEARCH X-PRINT-MATCHES TEXT "hello" -> * SEARCH 1 "He said:
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247 Hello world!" 2 "Hello, I'm ...". This would be especially useful with
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248 the above attachment scanning.
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249
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250 - lib-charset
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251 - utf8_toupper() is a must. and a bit difficult if we want to do it right.
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252 - add support for other things than iconv() as well? we could reuse
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253 the code from cyrus or courier
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254 - cache iconvs? they'd probably be faster if we just reset the
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255 conversion instead of opening new one every time. and there will likely
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256 be only one or two charsets which are used for nearly all conversions.
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257
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258 - deliver
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259 - recipient_delimiter setting so user+mailbox@domain works directly
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260
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261 - general
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262 - stop using atol(), atoi(), strtoul() etc. in places where we actually
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263 care about what they return, and rather create our own function which
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264 checks if the input overflows the integer, and if so call i_fatal()
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265 - solaris sendfile is broken?
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266 - rfc2231 continuation support (useless?)
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267 - rfc2557 support for BODYSTRUCTURE, as specified by RFC3501
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268 - LMTP server
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269 - ability to build plugins statically into the binaries
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270 - ~/.dovecotrc to override system wide settings. namespace settings should
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271 override all the previous namespace settings instead of adding new.
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272 - option to disable SORT, SEARCH and other memory/cpu-intensive features.
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273 defaults and per-user by dovecot-auth.
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274 - dotlock overriding is racy, but it's pretty difficult to fix it. Also
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275 overriding someone else's dotlock in shared folder isn't possible. These
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276 could be fixed by having separate lock process running as root, which
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277 would chown() the file for another uid and then unlink() it as that user.
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278 One problem with that is that if malicious user sets setuid+execute bits
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279 on for the file, he could run the file and get changed to the new uid.
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280 That hopefully shouldn't matter much since the new uid should be user
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281 with minimum possible privileges. Anyway, optional..
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282 - things break if next_uid gets to 2^32
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283
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284 capabilities:
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285 - preferrably all should be implemented as plugins
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286 - possibility to disable them from config file
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287 - THREAD=ORDEREDSUBJECT - although pretty useless I'd think.
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288 - acl (rfc4314)
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289 - id (rfc2971)
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290 - must be configurable what gets sent, default to only name=Dovecot
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291 - separate pre/post-login settings
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292 - optionally log configured parts of the client information, but only
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293 once, probably at the same time as logging "Logged in",
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294 "Disconnected", etc.
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295 - remember to force truncating values longer than 30 chars,
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296 especially before logging
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297 - mailbox-referrals (rfc2193)
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298 - this is useful whenever we would otherwise need to make the
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299 connection ourself. for example load balancing and shared mailboxes
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300 requiring another UID to run.
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301 - this rfc defines no exact way for server to detect if client
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302 supports referrals or not. I don't think there's much point in
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303 supporting only referrals, as most clients don't support them.
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304 Instead we should return referrals when we know that client
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305 supports them, otherwise do the connecting ourself. If client
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306 issues RLIST or RLSUB command, it's safe to assume it supports
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307 referrals.
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308 - for load balancing this works just fine, but what about shared
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309 mailboxes which require different UID? If we login with our own
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310 username, we end up with our own UID instead of what we wanted.
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311 IMAP URLs don't support separated authorization id which would
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312 have made this very easy.. We could give the "userid@group" as
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313 userid, but clients probably treat it as different userid and
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314 ask the password again.
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315 - problems, problems, .. maybe not worth the trouble.
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316 - drafts:
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317 - http://www.imc.org/ids.html
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318 - annotate (draft-ietf-imapext-annotate)
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319 - per-message annotations. this will be major change. especially
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320 because currently there's no suitable storage for them, and
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321 they'll probably change all the time.. maybe if we moved into
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322 berkeley db to store the .data file and these annotations.
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323 - this is separate problem from index files. indexes are treated as
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324 temporary files, annotations are permanent data. we'd have to
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325 support non-db way to do this too, which would probably be just a
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326 simple (slow) text file.
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327 - use lib-dict probably
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328 - metadata (draft-daboo-imap-annotatemore)
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329 - server and per-mailbox annotations. much easier than
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330 per-message annotations, but they'd be easier to place into
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331 db as well.
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332 - lib-dict, again
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333 - binary (draft-nerenberg-imap-binary)