- Replace IsFloodDone() occurrences with HasFlag()

- The `general::dots_in_ident` configuration directive has been renamed to `general::specials_in_ident`
  and now covers the '-' and '_' characters in addition to '.'

- Valid characters allowed in user names for local clients are now [A-Za-z0-9._-]

- whowas.h, whowas.c: rename list/hash dlink_node members of the Whowas struct to actually make sense

- monitor.h, monitor.c: monitor_find_hash() doesn't need to be externally visible

- Revert echo-message changes for now

- Rudimentary `cap-notify` support

- Add FLAGS_CAP302 to client flags for clients that support the CAP 302 extension

User mode `B` has been implemented. Clients with that mode set are marked as a bot
in both `WHOIS` and `WHO`. This mode can only be set by IRC operators (as long as
the `bot` directive is set in `general::oper_only_umodes`), servers, and services.

This mode can for example be used to mark HOPM as official network bot.

- monitor.h: update comment

- Replace WATCH with IRCv3.2 MONITOR

- Remove serno.h

- Remove CAPAB_QS. Quit Storm removal is default behavior for more than 20 years now.

- Implement accept() deferring. Closes github issue #4

- Cleanup ip address matching routine in various places

- Removed MAXIMUM_LINKS_DEFAULT

- channel_mode.c:channel_modes(): minor optimization to save potentially redundant member_find_link() calls

- Rename channel_member_names() to channel_send_namereply()

- Rename find_channel_link() to member_find_link()

- Move remove_a_mode() from m_join.c to channel.c and rename it to channel_demote_members();  have m_sjoin.c make use of it as well

- Replace remaining occurrences of IsMember with find_channel_link and remove IsMember entirely

- Rename Client::certfp to Client::tls_certfp

- Refactor Message flags

- parse.h: documenting

- Reformatting of various header files in some places

- Fixed style inconsistencies in various places

- Remove strtok_r() compatibility code

- propset

- Rename most occurrences of 'client_p' to 'client'

- Extbans have been implemented. Main implementation done by Adam for p4.
  Currently supported extbans:

  Matching:

   $a:<account>   Matches users logged into a matching account.
   $c:<channel>   Matches users that are on the given channel. An additional
                  prefix of either @, %, or + can be specified to test for
                  certain channel privileges.
   $o:<class>     Matches IRC operators that have joined a class
                  matching the mask.
   $r:<realname>  Matches users with a matching realname.
   $s:<server>    Matches users that are connected to a server matching the mask.
   $u:<modes>     Matches users having the specified user modes set or not set.
   $z:<certfp>    Matches users having the given TLS certificate fingerprint.

  Acting:

   $j:<banmask>   Prevents matching users from joining the channel.
   $m:<banmask>   Blocks messages from matching users. Users with voice
                  or above are not affected.

- tls_wolfssl.h: fixed minor documenting issue

- reference.conf, tls_gnutls.h: documentation updates

- Implemented experimental support for wolfSSL. Minimum supported version is 4.3.0

- In the serverinfo {} block, the following configuration directives have been renamed:

   ssl_certificate_file -> tls_certificate_file
   ssl_dh_param_file -> tls_dh_param_file
   ssl_dh_elliptic_curve -> tls_supported_groups
   ssl_cipher_list -> tls_cipher_list
   ssl_message_digest_algorithm -> tls_message_digest_algorithm

- In the operator {} block, the following configuration directives have been renamed:

   ssl_certificate_fingerprint -> tls_certificate_fingerprint
   ssl_connection_required -> tls_connection_required
   
- In the connect {} block, the following configuration directives have been renamed:

   ssl_cipher_list -> tls_cipher_list
   ssl_certificate_fingerprint -> tls_certificate_fingerprint

- channel.h: remove unused ShowChannel macro

- Rename several functions in conf.c as follows:
    set_default_conf -> conf_set_defaults
    read_conf -> conf_read
    validate_conf -> conf_validate
    lookup_confhost -> conf_resolve_host
    check_client -> conf_check_client
    read_conf_files -> conf_read_files
    clear_out_old_conf -> conf_clear

- Bump copyright years everywhere

- hash: move initialization of 'hashf_xor_key' into strhash() and kill hash_init()
- hash.c: stylistic changes

- Command handlers are now of type void again

- misc.h: use IEC prefixes

- auth.h: remove unused AuthRequest::node

- Expire gecos and resv denies on the fly while looking them up

- Removed general::tkline_expire_notices configuration directive and added user mode +X (sees *LINE expiration notices) instead

- whowas: rename hashv to hash_value

- ipcache.h: documentation update

- Should be using monotonic clock almost everywhere now; sort out mixture and misuse of 'firsttime', 'lasttime' and 'since' in the Connection structure

- Add support for monotonic clocks and have some timers make use of it;  remove event_set_back_events()

- auth.c: remove auth_timeout_queries() and related code. Just let the dns and identd timeouts finish the request
- Removed IDENTTIMEOUT from '/set' options. We now no longer allow users to change this on runtime. identd timeout is 5 seconds now

- Cleanup server connecting related code even further
- Make comm_connect_tcp() take less arguments and remove unused dns resolving functionality

- getopt: rename YESNO to BOOLEAN

- Made comm_get_sockerr() and comm_accept() take a fde_t pointer as argument

- Tidy up some enums;  misc style corrections

- Made Connection::oper_warn_count_down unsigned; clean up some logic in check_spambot_warning()

- The 'general::ignore_bogus_ts' configuration option has been deprecated

- fdlist.h: remove unused F->connect.S;  reduce FD_DESC_SIZE to 80

- conf.h: remove unused CidrItem struct

- modules: replace MODULE_FLAG_CORE and MODULE_FLAG_NOUNLOAD with dedicated variables;  fixed the ircd from crashing in case reloading a module fails

- Rewrites to have parse_handle_command() end the flood grace period.  MODE and TIME no longer ends the grace period.

- Get rid of Connection::allow_read and have parse_client_queued() determine max lines to be processed

- More bool conversion. This should be everything now.

- Stylistic changes

- Make use of bool even more

- Make use of the bool data type in some more places

- Use bool data type in struct Whowas

- Cleanups to add_id and del_id; have these function take a dlink_list pointer to the channel's banmask list

- channel_mode.h: remove excessive const

- ircd_getopt.h: remove unused ENDEBUG from argtype

- client.h: whitespace cleanups

- class_ip_limit_add, class_ip_limit_remove: use void pointers for 'addr'

- Rename Channel:locmembers to Channel::members_local

- ipcache: rewrite to use patricia

- watch: cache hash values

- Further cleanups to log.c

- Killed userhost.c. Rewrote everything to use ipcache.c

- Move svstag related code into its own files

- Implemented channel mode 'N' which prevents users from changing their nick while in a channel with that mode set

- Report configured pseudo {} blocks in '/stats R'. For now we use the numeric 227. Maybe there's some other numeric that's more suitable for this.

- Stylistic changes

- Stylistic changes

- Remove CHW and HOPS server capabilities. These are mandatory for quite some time now.

- Rename attach_conf() -> conf_attach(), detach_conf() -> conf_detach(); clean up documentation

- Clean up some awful CONF_SERVER handling in serv_connect()

- defaults.h: change NETWORK_NAME_DEFAULT and NETWORK_DESC_DEFAULT

- Fixed bug spotted by Erick J. Velez where ircd would not remove RPL_WHOISOPERATOR based svstags when deoppering.

- Style corrections

- client.h: removed 'country_id' libgeoip leftover from Client struct

- auth.h, auth.c: reformating; rename some functions to comply with naming convention

- Update copyright years

- Store real host information in Client.realhost and extend the UID message to send the actual host.
  This allows operators to see the real host of a client in /whois and /whowas.

- Remove UMODE_HIDDENHOST as we don't need a separat mode for that

- server_capab.h, server_capab.c: propset

- Move all CAPAB related code to server_capab.c, and server_capab.h

- Get rid of chm_registered() and chm_simple_oper()

- Add RPL_ETRACEEND numeric taken from irc2.11

- Implemented channel mode 'L'. Channels with that mode set can make use of an extended ban list size
  specified with the new 'channel::max_bans_large' configuraton option. This mode can be set only by
  irc-operators or servers.

- channel_mode.h, channel_mode.c: use 'unsigned' in some places

- configure.ac: remove test for sys/resource.h

- Removed redundant 'Count.max_loc_cli'; use 'Count.max_loc' instead

- Made server_hunt() return a const pointer

- Get rid of Count.local

- Get rid of Count.total

- Rename some functions in auth.c to comply with naming convention

- Move check_server() from server.c to m_server.c; rename it to server_check()

- patricia.h: remove 'user1' data pointer from the _patricia_node_t struct

- Import FLOODTIME changes from p4

- patricia.c, patricia.h: prefix several externally visible functions with patricia_

- patricia.c, patricia.h: rewrite prefix_toa() to suck less

- patricia.c, patricia.h: indenting; remove extraneous parentheses

- patricia.h, patricia.c: constification

- patricia.h, patricia.c: kill _prefix4_t struct. we can afford the little extra memory

- patricia.h, patricia.c: removed void_fn_t typedef

- Minor style corrections and constifications

- motd.h: increase MOTD_LINESIZE to 321

- Get rid of clear_ban_cache_channel() and clear_ban_cache_client(). Use clear_ban_cache_list() instead.

- Add stripws() to irc_string.c; make warnings about syntax errors with multiple whitespaces look nicer

- conf_pseudo.h, conf_pseudo.c: added pseudo_get_list() for later use

- Fixed svn properties

- Minor cleanup to send_umode() to get rid of the redundant struct Client * pointer

- token_vector(): use unsigned where appropriate

- Rename init_resolver() to resolver_init()

- Minor cleanup to client/channel burst logic

- conf.c: removed unused cluster_a_line() prototype

- ircd_defs.h: increase REASONLEN to 260

- ircd_defs.h: add TOPICLEN documentation

- mempool.h: #undef MEMPOOL_STATS

- Rename Client::whowas to Client::whowas_list

- Further cleanups to recent WHOWAS changes

- parse_aline() cleanups

- Cleanups to operator/connect block lookup routines

- whowas.c: doxygen

- Show some stats about allocated listeners in /stats z

- Remove excessive 'const'

- Now that we got time_t to work nicely on openbsd with snprintf's conversion specifiers,
  we ran into a similiar issue on Raspbian/ARMv7's time_t which is of signed 32 bit and
  doesn't cope at all with %j. Instead of doing tricks, get rid of time_t everywhere and
  forever and use uintmax_t instead which has at least a 'standardized' conversion specifier
  associated with it.

- Remove useless header includes

- Constification

- svn propset

- Add conf_gecos.*

- Cleanup/separate RESV conf implementation

- Leave fd 3 open for GnuTLS < 3.3.10 that don't have https://gitlab.com/gnutls/gnutls/commit/684b825f5f78cc7ad1f61be232fd20ee0bc5b56f

  "  When gnutls_global_init() is called manually from the application check the urandom fd for validity
     That addresses the issue where a server closes all open file descriptors
     and then calls gnutls_global_init().  "

- conf_cluster: remove useless header include

- Renamed 'mod_clear_paths()' to 'modules_conf_clear()'. Further simplification to modules_conf_clear()

- Move resv.* to conf_resv.*

- conf.h: removed old shared_items leftover

- tls*: more copyright fixups

- More copyright -- from Adam

- stdinc.h: removed openssl header includes which no longer should be here

- tls_gnutls.h: fixed compile error

- conf_pseudo.h, conf_pseudo.c: fix/update copyright header

- propset

- watch.h, watch.c, m_watch.c: rename some variables for consistency

- Rename 'non-standard' RPL_ENDOFTRACE to RPL_TRACEEND

- Update copyright years

- Move IRCD_MAXNS to reslib.h, rename it to RESLIB_MAXNS, and increase it to 8

- resv.txt, stdinc.h: comment/documentation updates provided by jackal

- USERHOST_REPLYLEN I never liked. Gone.

- Add CMEMBER_STATUS_FLAGS / CMEMBER_STATUS_FLAGS_LEN and make use of it in some places (replaces some magic values sprinkled in the code)

- channel.h, channel.c: declared can_join() as static

- parse.h: remove MessageHandler typedef

- server.h: update doxygen comments

- Use the %ju conversion specifier for time_t and get rid of these non-portable (unsigned long) casts; replace some uint64_t with uintmax_t

- Implement ircv3.2 invite-notify client capability support

- Add valid_uid() for later use

- Make mem-usage counters use size_t and use the %zu conversion specifier accordingly

- user.h: removed unused show_isupport

- Add all the missing irc-operator flags to /stats o output

- client.h: more documentation updates

- client.h: add some rather useful documentation to Connection::lasttime

- Rename event::enabled to event::active

- Rename uconf_items to shared_items and oconf_items to operator_items

- client.h: if HasOFlag is being used on remote clients, something is wrong. Let it crash instead of silently ignoring it.

- client.h: clean up some nonsense in the SetOper/ClearOper macros

- Added serverhide::flatten_links_file configuration option and get rid of LIPATH

- Removed CHALLENGE in favour or ssl certificate fingerprint enabled operator {} blocks

- server.h: swap keywords on find_capability()

- motd.h, motd.c: have motd_signon() use date_iso8601()

- m_stats.c:show_iline_prefix(), report_auth(): let remote opers see auth blocks {} with spoofs and k/x-line exempts
- client.h: removed now unused MyOper macro

- ircd_defs.h: increase KILLLEN and REASONLEN to 240

- Database files and links.txt are now stored in /var/lib instead of /etc

- client.h: wrong value assigned to OPER_FLAG_UNRESV

- client.h: style corrections

- Rename functions in userhost.c to comply with naming convention

- Get rid of smalldate() and replace all instances of it with date_iso8601()

- Implement ircv3.1 account-notify extension

- Use an embedded list node for the ListTask struct

- Rename several functions in channel.c to comply with naming convention

- Rename several functions in listener.c to comply with naming convention

- Remove unused header includes

- Rename server capabilities flags from CAP_* to CAPAB_*

- Cleanup/fix names of several #ifndef INCLUDED_*

- Get rid of the IsRegistered() macro, which is a rather dangerous macro for coders who add new connection states

- Get rid of UMODE_ALL

- Make use of the *Flag() macros in some more places

- Set keyword and eol-style properties

- Rename oper_up() to user_oper_up()

- Moved all ISUPPORT related code to isupport.c; renamed several functions to meet our coding convention

- Automatically generate sid on startup if none is configured. Patch provided by Adam 

- Added 'xline_exempt' to auth{} block flags

- Use C99-style initializers in all struct Message items
- Removed MFLG_SLOW
- Removed DUMMY_HANDLER

- hostmask.c:find_conf_by_address(): constification

- Removed glines
- Added kline_min_cidr, kline_min_cidr6, dline_min_cidr and
  dline_min_cidr6 configuration options

- patricia.h: removed some windows support leftovers

- Changed some function to void if we don't need a return value
- Have some other functions return saner values

- Changed some members of the Ban structure to use fixed-size arrays

- conf.h, conf.c: renamed some structures to match naming convetion of other structures

- WHOWAS now shows IP addresses to irc operators
- Changed RPL_WHOISACTUALLY numeric string. In the future it will also show the
  *real* hostname once we distinguish between spoofs/vhosts and real hosts

- Fixed core in conjunction with OSX 10.10/possibly other system when parsing pseudo{} blocks as reported by Daniel Oaks
- Reverted -r4080, -r4609 and 4106 as they only cause undefined behavior on some systems

- Renamed SVIDLEN to ACCOUNTLEN

- Don't make use of CAP_TS6 as we no longer need it, but still send it to other servers via CAPAB for backward compatibility

- Added oper::whois configuration option which allows to override the default
  RPL_WHOISOPERATOR numeric string shown in /whois.

- Finish basic SVSTAG implementatio

- server.h: removed redundant struct MaskItem declaration

- Update documentation in some places

- numeric.h, numeric.c: moved ERR_SSLONLYCHAN numeric to 489 to match with insp/unreal

- Added channel mode +C which prevents users from sending CTCPS to a channel

- numeric.h, numeric.c: moved ERR_OPERONLYCHAN numeric to 520 to match with insp/unreal

- Fixed compile warnings

- Update copyright years

- patricia.c, patricia.h: ipv6 is mandatory

- Added latest patricia.c, patricia.h from Net-Patricia-1.22 for later use

- Added 'opme' to irc-operator flags

- The general::true_no_oper_flood configuration option has been deprecated.
  Operators still can have higher 'flood' limits with no_oper_flood = yes;
  hoewever, they are no longer allowed to bypass RecvQ limits.

- general::hide_spoof_ips is now deprecated

- Renamed variables; const correctness
- Removed IsConfOperator macro

- Const-correctness

- Renamed clear_ban_cache() to clear_ban_cache_channel() to separate it
  better from the clear_ban_cache_client() function

- Renamed Client::svid to Client::account

- channel.c, channel.h: added clear_invites() and make use of it
- ms_sjoin.c:ms_sjoin(): clear invites if the introduced channel has lower TS

- Removed pointless test for UMODE_DEAF in both sendto_channel_local() and
  sendto_channel_local_butone()

- Constification

- Removed hybrid 6 leftovers

- Don't assemble umode buffer twice in send_umode_out()

- ircd.h: changed Counter structures to anonymous structure

- numeric.h, numeric.c: removed unused ERR_RESTRICTED

- Update GPL 2 license headers

- Fixed previous changes to parse.h

- Implemented pseudo {} blocks (service aliases)
- Fixed compile warnings with -Wmissing-field-initializers

- Add topic mask option to /list

- Fixed compile warnings

- Removed stupid PF typedef in fdlist.h which prevented both gcc and clang from spitting out
  a warning about the first argument of s_bsd:ssl_handshake() being an 'int' when it really
  has to be a 'fde_t' pointer.
- Fixed first argument of s_bsd:ssl_handshake() which should be a 'fde_t' pointer instead of an 'int'.

- auth.h: update documentation

- Renamed various variables

- Added listener_release() and make use of it

- Fixed resolver/auth issues with too long hostnames

- Unset FLAGS_IPHASH on source_p in exit_client() when removing from ipcache

- ipcache.h: update documentation

- motd.h, motd.c: clean up/fix comments

- Removed unused ConfigServerInfo structure member

- event.h: style correction

- ipcache.c:ipcache_get_stats(): constification; depend on the caller to set integers to zero

- Moved all ip caching related code to ipcache.c

- Improved AWAY throttling to allow for better fine-tuning

- Cleaned up and sanitized /challenge related code
- rsa.c:get_randomness(): removed EGD support; also don't fall back to RAND_pseudo_bytes()
  if RAND_bytes() fails. If RAND_bytes() fails, just reject the /challenge request.

- Renamed serv_list to local_server_list

- Bring back channel->locmember list

- event.c, event.h: update copyright headers

- Make use of binary_to_hex() in ssl_handshake() and ssl_server_handshake()

- Removed supported.h

- Merged Adam's event system rewrite

- Let mp_pool_get() clear memory

- client.h: fixed comment

- channel.h: removed Channel.last_invite; it's not used anymore

- Renamed OPER_FLAG_K to OPER_FLAG_KLINE

- Renamed global_channel_list to channel_list

- Fixed SVSJOIN/SVSPART issues

- Greatly speedup d-line lookup. Instead of testing every single client against
  every existing d-line just check the just added ban against connected clients.
  Also now check d-line _before_ looking for a matching exempt{}

- Ugly-fix compile warning

- Use 'unsigned' whenever possible

- client.h: fixed spelling error

- Added general::throttle_count idea from p4

- Removed OPERWALL. Use GLOBOPS instead.

- send.h: update comment

- stdinc.h: whitespace commit

- Added INVITE flood protection/throttling as requested by Adam. This basically
  works similar as the KNOCK throttling algorithm.

- More ms_sjoin() cleanups

- Removed unused ChModeChange.client

- Removed CHFL_DEOPPED flags which is no longer needed with TS6

- conf.h: removed extraneous comma

- stdinc.h: disable printf format __attribute__

- Removed RPL_STATSNLINE

- doxygen

- Added usermode +p which hides channel list in WHOIS

- Renamed MyMalloc() to MyCalloc()

- conf.h: remove unused macros

- Get rid of LOCAL_CHANNELLEN; change CHANNELLEN to 50

- Doxygen
- Update help/undline

- Style corrections

- Moved s_auth.c to auth.c

- Moved irc_res.c to res.c
- Moved irc_reslib.c to reslib.c

- Moved set_user_mode() to m_mode.c

- Undo -r3215 for now

- Made irc_nscount an unsigned type

- Made safe_list_channels and list_one_channel only take two parameters

- Clean up redundant/unused header includes

- Worked towards improving documentation

- Have /info report MPATH and SPATH aswell

- Get rid of the HasID() macro

- Get rid of kill_client()

- More client_p removal cleanups

- parse.h: removed redundant comment

- Removed client_p pointers from everywhere

- Get rid of halfop -> op rewriting for servers that don't support halfops

- Update dbuf.h, dbuf.c

- Added sendto_one_notice()

- Applied dbuf changes as provided by Adam:
  Refcount dbufs instead of copying the same message to many
  different buffers.

- s_auth.h: made 'flags' an unsigned int type

- conf_class.h: use an enum for flag types