Mercurial > dovecot > core-2.2

annotate TODO @ 376:fd1fc4cf11b7 HEAD

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updated with lots of new capability comments
author Timo Sirainen <tss@iki.fi>
date Sun, 06 Oct 2002 19:08:27 +0300
parents 37d52d6a3e7a
children 47d0c169bdba
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1 test:
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2 - make sure mmap()s work properly with NFS
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3 - make sure locking is done properly when opening/switching modifylog
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4 - make sure SELECT rebuilds index properly when next_uid is near 32bit value
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5 - make sure rfc822_parse_date() works properly
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6 - make sure imap_match functions work properly
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7 - make sure connection limits work
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8 - make sure the index's ftruncate stuff works
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9 - make sure modify log works properly, especially switching the files
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10
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11 index:
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12 - mbox:
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13 - if a file isn't valid mbox and it's tried to be opened, say it in one
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14 line in error log, not 6..
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15 - locking: if we set shared lock to it while we're accessing it, we could
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16 get it pretty reliable. this means that the mbox fd needs to be locked
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17 before sync() and kept locked after that until we're done with it.
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18 - requires mbox file to be open all the time. i guess that's fine.
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19 - expunge requires dropping the shared lock and getting exclusive
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20 lock. after that we must sync again to make sure the file wasn't
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21 changed.
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22 - could be done in index->set_lock() and try_lock(). in that case
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23 ignore the above
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24 - empty lines at beginning of file still aren't ignored
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25 - read-only support for mailboxes where we don't have write-access? Maybe,
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26 but don't try to use their indexes since that's way too problematic, and
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27 probably even impossible since we can't lock it.
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28 - we should try to avoid completely rebuilding indexes unless they're
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29 corrupted. especially if we later want to support some read-only boxes
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30 and keep the mail flags only in index file. fsck() could verify that
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31 records are ok, and that if data file isn't ok the record is deleted.
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32 - if .customflags is removed and Maildir files have custom flags, add
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33 "unknown1" "unknown2" etc. flags to .customflags file for each found flag
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34 - debug: index could be read-only mmaped when it's not locked.
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35 - when index is being rebuilt, it always complains about tree/modifylog
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36 having wrong indexid..
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37 - we sometimes leave some space in the index files (memory alignment,
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38 extra_space). we should keep those bytes zeroed to make sure nothing
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39 sensitive is left there.
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40 - verify memory alignment is valid when reading from index files. if we
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41 used "unsigned int record_index"es instead of uoff_t's there wouldn't be
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42 any problems.. yes, good idea :)
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43 - tree file is never shrinked
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44 - tree has some locking issues while opening it
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45
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46 lib-storage:
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47 - support multiple mailbox formats and locations for one user. that would
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48 require support for multiple MailStorages, and since we're chroot()ed,
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49 usually the only way to communicate with others would be to create
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50 RemoteMailStorage which would use TCP/UNIX sockets to connect to another
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51 imap session.
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52 - SEARCH:
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53 - optimize [UN]SEEN, [UN]DELETED and [UN]RECENT. They're able to
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54 skip lots of messages based on the index header data.
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55 - CHARSET support, iconv()? also means we need to parse the charset stuff
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56 in headers.
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57 - could optionally support scanning inside file attachments and use
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58 plugins to extract text out of them (word, excel, pdf, etc. etc.)
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59 - should use imap-msgcache, especially for size checking
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60 (or should it bother? with larger mailboxes there's no use for it)
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61 - use a trie index for fast text searching, like cyrus squat?
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62 - DELETE/RENAME: when someone else had the mailbox open, we should
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63 disconnect it (when stat() fails with ENOENT while syncing)
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64 - RENAME INBOX isn't atomic with Maildir. And in general, RENAME can't
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65 move mails between different storages. Maybe support doing also using
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66 COPY + delete once COPY is atomic?
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67 - maildir: atomic COPY could be done by having transaction directories.
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68 Make a "tra" directory at the same level as cur/new/tmp, and make it
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69 have subdirectories in the same way as tmp has temp files. Directory
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70 begins with a "." as long as transaction isn't finished, rename()ing
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71 it away finishes it. All mails under finished dirs must be moved into
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72 new/ directory and the directory removed by any process who notices them.
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73 - we should probably do some light checking that appended mails actually
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74 look like valid rfc822 mails..
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75 - maybe limit the length of custom flags? we don't really have a problem
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76 with them, but with mbox a long X-IMAPbase could break something.. Maybe
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77 configurable, default to 50 chars?
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78 - we could send flag changes after all commands by making expunge/flags sync
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79 counters separate for modify log. flags would need to update the seq
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80 though, too slow?
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81 - things calling message_send() could verify that it wrote enough data.
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82 if not, fill the rest with spaces and return failure.
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83
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84 general:
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85 - sieve? (rfc3028)
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86 - rfc2231 continuation support
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87
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88 - go through .temp files and delete them
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89 - Content-Language isn't parsed correctly
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90 - ulimit / setrlimit() should be set somewhere for imap process
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91 - create indexer binary
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92 - SIGHUPing master should reload the configuration .. killing imap-auth and
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93 imap-login processes? or just signal imap-login to stop accepting new
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94 connections and let it kill itself
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95 - settings for specifying what sort of data to cache by default
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96 (index->cache_fields)
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97 - setting for choosing mbox locking methods
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98 - imap-login leaks I/O descriptors when killed, that's because the SSL
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99 fds are destroyed lazily.. should we bother fixing..?
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100 - logins are always sent now using syslog(), we'd need to have i_info()
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101 or something so they could also be written to log files.. also make it
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102 possible to log into different log than errors.
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103 - should we bother checking if there's invalid 8bit headers in
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104 BODY/BODYSTRUCTURE output and converting them to quoted printable? well,
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105 several of them are now but not all..
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106 - update docs/index.txt
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107 - support Maildir++ quota
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108 - maybe give more untagged NO/ALERT replies? like when mailbox is in
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109 inconsistent state.
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110
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111 auth / login:
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112 - kchuid, SRP, anonymous SASL
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113 - PAM: support some options so /etc/passwd-lookup isn't needed. uid=x, gid=y,
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114 mailroot=/var/mail. maildirs should be then created when needed
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115 - Digest-MD5: support integrity protection, and maybe crypting. Do it
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116 through imap-login like SSL is done?
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117 - imap-auth should limit how fast authentication requests are allowed from
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118 login processes. especially if there's one login/connection the speed
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119 should be something like once/sec. also limit how fast to accept new
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120 connections.
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121 - Diffie Hellman parameters should be regenerated once in a while
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122 - HIGH: support executing each login in it's own process, so if an exploit
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123 is ever found from it, the attacker can't see other users' passwords.
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124 - master should limit number of login processes to max_logging_users,
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125 killing old processes when limit is reached
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126 - master should try to keep login_processes_count extra processes all
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127 the time
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128 - login should notify master after it accept()s, and it must close the
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129 listening socket immediately
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130 - Diffie Hellman parameters for SSL need to be somehow transferred
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131 between login processes. It's too slow if they're generated every time,
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132 and I'd rather not link SSL libs to imap-master.
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133
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134 cleanups / checks:
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135 - grep for FIXME
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136 - check if t_push()/t_pop() should be added somewhere
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137 - IOBuffer should probably be split into IBuffer and OBuffer, and maybe
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138 making it's internals hidden .. or at least only partly visible.
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139 - allocating readwrite pools now just uses system_pool .. so pool_unref()
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140 can't free memory used by it .. what to do about it? at least count the
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141 malloc/free calls and complain if at the exit they don't match
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142 - ..wonder what it would look like if I did s/FooBarBaz/struct foo_bar_baz/..
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143 - HIGH: Make sure messages of size INT_MAX..UINT_MAX (and more) work
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144 correctly with 32bit file offsets. virtual_size can also overflow making
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145 it less than physical_size.
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146 - create env_put() and env_clean()
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147 - nearest_power() could be problematic with things that want it for ints,
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148 not size_t..
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149
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150 optional optimizations:
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151 - provide some helper binary to save new mail into mailboxes with CR+LF
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152 line breaks?
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153 - disk I/O is the biggest problem, so split the mail into multiple computers
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154 based on user and have a proxy in the front redirecting the connection.
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155 cyrus had something like this except a lot more complicated - it tried
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156 to fix the problem of having shared mailboxes. we have the same problem
293
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157 with local shared mailboxes as we don't use same UID for everyone's mail
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158 and we may be chrooted, so locally we could communicate with UNIX sockets,
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159 remotely that could be done with TCP sockets.
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160
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161 capabilities:
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162 - preferrably all should be possible to #ifdef away by a configure
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163 option (--without-capabilities=acl,namespace,...)
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164 - possibility to disable them from config file
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165 - acl (rfc2086, draft-ietf-imapext-acl), namespace (rfc2342)
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166 - probably do it like cyrus. "user.<username>" to access other
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167 users, with "" defaulting to "user.<myself>". these should be
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168 configurable however.
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169 - shared namespaces? maybe configurable in config file
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170 - easiest way to do ACL would be to use unix modes, but is that
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171 useful at all? Well, ACL2 has a bit better support for that, so
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172 maybe we could support it.
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173 - otherwise gets a bit trickly, we could keep all mail in "imapmail"
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174 group and 0600/0700 mode by default, but when mail is shared to others,
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175 the group read/write access bits would be set. or alternatively we
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176 could launch another imap process to handle it, which we should support
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177 anyway. ACLs could be stored into ".acl" ascii file in each folder.
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178 - are flags private or shared between users? lets see if we can
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179 get ACL2 to configure this.. \Deleted must be shared always,
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180 \Seen should be private by default.
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181 - quota (rfc2087, draft-cridland-imap-quota)
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182 - give filesystem values only to admins
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183 - support for Maildir++, probably no need to support more.
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184 quota capability supports complex quota configuration, but if
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185 no mailer supports them we probably shouldn't bother either
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186 - id (rfc2971)
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187 - must be configurable what gets sent, default to only name=Dovecot
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188 - separate pre/post-login settings
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189 - optionally log configured parts of the client information, but only
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190 once, probably at the same time as logging "Logged in",
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191 "Disconnected", etc.
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192 - remember to force truncating values longer than 30 chars,
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193 especially before logging
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194 - mailbox-referrals (rfc2193)
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195 - this is useful whenever we would otherwise need to make the
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196 connection ourself. for example load balancing and shared mailboxes
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197 requiring another UID to run.
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198 - this rfc defines no exact way for server to detect if client
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199 supports referrals or not. I don't think there's much point in
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200 supporting only referrals, as most clients don't support them.
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201 Instead we should return referrals when we know that client
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202 supports them, otherwise do the connecting ourself. If client
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203 issues RLIST or RLSUB command, it's safe to assume it supports
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204 referrals.
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205 - for load balancing this works just fine, but what about shared
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206 mailboxes which require different UID? If we login with our own
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207 username, we end up with our own UID instead of what we wanted.
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208 IMAP URLs don't support separated authorization id which would
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209 have made this very easy.. We could give the "userid@group" as
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210 userid, but clients probably treat it as different userid and
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211 ask the password again.
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212 - problems, problems, .. maybe not worth the trouble.
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213 - literal+ (rfc2088)
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214 - simple. in case of invalid data, just disconnect client.
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215 - idle (rfc2177)
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216 - just call the syncing every few seconds (configurable)
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217 - with Linux we can use fcntl() and F_SETSIG to provide fast checks.
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218 just make sure sync() still won't be called more than once in a
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219 few seconds
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220 - uidplus (rfc2359)
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221 - uid expunge: no problem
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222 - append, copy: oh no. these would slow down things and make
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223 handling them much more difficult. currently we just store the
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224 mails to destination mailbox without touching the indexes. since
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225 we'd need to know their final UID, we'd have to lock the indexes
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226 and mbox) fsck() first and append() next to find out the uid,
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227 maildir) move the mail directly into cur/ and index it.
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228 - unselect (no draft or anything AFAIK)
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229 - like CLOSE, but doesn't expunge mails. easy.
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230 - drafts:
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231 - http://www.imc.org/ids.html
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232 - multiappend (draft-crispin-imap-multiappend)
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233 - shouldn't have any problems
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234 - listext (draft-ietf-imapext-list-extensions)
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235 - well, it expired January 2002.. I like it though.
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236 - children (draft-gahrns-imap-child-mailbox)
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237 - I like listext more.. They have the same functionality though,
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238 so pretty easy to support both if needed
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239 - annotate (draft-ietf-imapext-annotate)
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240 - per-message annotations. this will be major change. especially
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241 because currently there's no suitable storage for them, and
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242 they'll probably change all the time.. maybe if we moved into
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243 berkeley db to store the .data file and these annotations.
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244 - annotatemore (draft-daboo-imap-annotatemore)
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245 - server and per-mailbox annotations. much easier than
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246 per-message annotations, but they'd be easier to place into
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247 db as well.
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248 - binary (draft-nerenberg-imap-binary)
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249 - perhaps not too useful. I'd like to make Dovecot fully
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250 binary-safe though.
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251 - sort (draft-ietf-imapext-sort)
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252 - basically sorted SEARCH, requiring CHARSET support for
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253 UTF-8 and ASCII
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254 - we could create alternative binary tree file(s) for different sort
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255 conditions, ".tree-sort" or something. or if we decide to just
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256 keep it in memory, btree could still be best choice.
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257 - required by squirrelmail (webmail)
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258 - thread (draft-ietf-imapext-thread)
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259 - basically SORT but reply with thread lists
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260 - possibly use a binary tree too .. or maybe it's enough to use the
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261 sort-tree and then just pick up the references separately? have to
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262 check more carefully later.
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263 - view (draft-ietf-imapext-view)
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264 - slow, complex, luckily draft expired almost two years ago.
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265 i hope i don't have to implement this :)
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266 - can be done client-side just fine (evolution's virtual folders)