我看过RFC，但我仍在努力。我已经用C#编写了一个基本客户端，但是找不到有关如何正确连接的文档。
连接并发送NICK和USER信息后，我需要加入一个 channel 。如果我立即进行JOIN操作，则什么也不会发生-大概是因为太早了。我必须延迟它，但是我不知道我需要等待哪个命令才能知道可以继续执行。
我得到类似的东西:
:irc.fish.net注意事项:查找您的主机名...
和
:irc.fish.net 001 FishBot:欢迎
以及代码为002、003、005、251、252等的内容，但我找不到任何在线内容来显示这些内容。
所以我的两个基本问题是:您发送了一个JOIN作为响应，我在哪里可以找到上述IRC代码对应的内容？ RFC文档没用!
最佳答案
RFC文档当然不是没有用的!正确，您需要先发送USER，再发送NICK。您得到的NOTICE是IRC服务器正在尝试通过称为IDENTD的协议(protocol)重新连接到您的PC。这是一个相对简单的协议(protocol)，但它的最终结果是它想知道连接到服务器的主机上的程序正在使用服务器具有的本地/远程端口。
可能是，防火墙阻止了此操作(并且您可能未在运行IDENTD服务器)。尽管成熟的IRC客户端将实现它，但这并不是一个大问题。您可以找到更多here。这会涉及更多细节。实现起来相对简单。
如果大多数IRC服务器无法连接到您，它将放弃它，而我已经忘记了它的确切副作用(已经有一段时间了)，但是您要查找的下一条消息是MOTD_START/MOTD/MOTD_END和ERR_NOMOTD。只有当您收到当天消息的结尾或处理了ERR_NOMOTD(没有消息)后，您才可以使用JOIN加入 channel 。
顺便说一句，这是一个很好的RegEx，可以匹配IRC服务器的输入:
^(?:[:@]([^\\s]+) )?([^\\s]+)(?: ((?:[^:\\s][^\\s]* ?)*))?(?: ?:(.*))?$
IRC RFC列出了所有可能的代码及其含义。我不确定您为什么认为他们没有用。您正在引用哪些？
编辑
我在IRC上查找了旧的C++代码，因此可能会有所帮助。连接后，它进入协商阶段(我已标记为该阶段):
谈判阶段:
PASS mypassword。 USER命令。 ERR_NOMOTD和END_OFMOTD。在其中之一出现之前，您没有“正式联系”。 协商昵称阶段:
在连接过程中，您要使用的昵称很有可能已经被使用。因此，客户应:
NICK命令ERR_NICKINUSE响应，请再次发出。如果您没有其他昵称可使用，则可以进行紧急救助或提示用户输入另一个昵称。 需要考虑的其他事项:
PING命令。空闲时，服务器将发送此消息。将其作为高优先级处理，并使用服务器提供给您的数据返回PONG。否则，将确保您断开连接，并且在测试IRC客户端时，这可能会给后端带来痛苦。 奖励乐趣
这是我对IRC命令的枚举，您应该可以很容易地将其放入C#中:
// reply ids
enum Reply
{
RplNone = 0,
// Initial
RplWelcome = 001, // :Welcome to the Internet Relay Network <nickname>
RplYourHost = 002, // :Your host is <server>, running version <ver>
RplCreated = 003, // :This server was created <datetime>
RplMyInfo = 004, // <server> <ver> <usermode> <chanmode>
RplMap = 005, // :map
RplEndOfMap = 007, // :End of /MAP
RplMotdStart = 375, // :- server Message of the Day
RplMotd = 372, // :- <info>
RplMotdAlt = 377, // :- <info> (some)
RplMotdAlt2 = 378, // :- <info> (some)
RplMotdEnd = 376, // :End of /MOTD command.
RplUModeIs = 221, // <mode>
// IsOn/UserHost
RplUserHost = 302, // :userhosts
RplIsOn = 303, // :nicknames
// Away
RplAway = 301, // <nick> :away
RplUnAway = 305, // :You are no longer marked as being away
RplNowAway = 306, // :You have been marked as being away
// WHOIS/WHOWAS
RplWhoisHelper = 310, // <nick> :looks very helpful DALNET
RplWhoIsUser = 311, // <nick> <username> <address> * :<info>
RplWhoIsServer = 312, // <nick> <server> :<info>
RplWhoIsOperator = 313, // <nick> :is an IRC Operator
RplWhoIsIdle = 317, // <nick> <seconds> <signon> :<info>
RplEndOfWhois = 318, // <request> :End of /WHOIS list.
RplWhoIsChannels = 319, // <nick> :<channels>
RplWhoWasUser = 314, // <nick> <username> <address> * :<info>
RplEndOfWhoWas = 369, // <request> :End of WHOWAS
RplWhoReply = 352, // <channel> <username> <address> <server> <nick> <flags> :<hops> <info>
RplEndOfWho = 315, // <request> :End of /WHO list.
RplUserIPs = 307, // :userips UNDERNET
RplUserIP = 340, // <nick> :<nickname>=+<user>@<IP.address> UNDERNET
// List
RplListStart = 321, // Channel :Users Name
RplList = 322, // <channel> <users> :<topic>
RplListEnd = 323, // :End of /LIST
RplLinks = 364, // <server> <hub> :<hops> <info>
RplEndOfLinks = 365, // <mask> :End of /LINKS list.
// Post-Channel Join
RplUniqOpIs = 325,
RplChannelModeIs = 324, // <channel> <mode>
RplChannelUrl = 328, // <channel> :url DALNET
RplChannelCreated = 329, // <channel> <time>
RplNoTopic = 331, // <channel> :No topic is set.
RplTopic = 332, // <channel> :<topic>
RplTopicSetBy = 333, // <channel> <nickname> <time>
RplNamReply = 353, // = <channel> :<names>
RplEndOfNames = 366, // <channel> :End of /NAMES list.
// Invitational
RplInviting = 341, // <nick> <channel>
RplSummoning = 342,
// Channel Lists
RplInviteList = 346, // <channel> <invite> <nick> <time> IRCNET
RplEndOfInviteList = 357, // <channel> :End of Channel Invite List IRCNET
RplExceptList = 348, // <channel> <exception> <nick> <time> IRCNET
RplEndOfExceptList = 349, // <channel> :End of Channel Exception List IRCNET
RplBanList = 367, // <channel> <ban> <nick> <time>
RplEndOfBanList = 368, // <channel> :End of Channel Ban List
// server/misc
RplVersion = 351, // <version>.<debug> <server> :<info>
RplInfo = 371, // :<info>
RplEndOfInfo = 374, // :End of /INFO list.
RplYoureOper = 381, // :You are now an IRC Operator
RplRehashing = 382, // <file> :Rehashing
RplYoureService = 383,
RplTime = 391, // <server> :<time>
RplUsersStart = 392,
RplUsers = 393,
RplEndOfUsers = 394,
RplNoUsers = 395,
RplServList = 234,
RplServListEnd = 235,
RplAdminMe = 256, // :Administrative info about server
RplAdminLoc1 = 257, // :<info>
RplAdminLoc2 = 258, // :<info>
RplAdminEMail = 259, // :<info>
RplTryAgain = 263, // :Server load is temporarily too heavy. Please wait a while and try again.
// tracing
RplTraceLink = 200,
RplTraceConnecting = 201,
RplTraceHandshake = 202,
RplTraceUnknown = 203,
RplTraceOperator = 204,
RplTraceUser = 205,
RplTraceServer = 206,
RplTraceService = 207,
RplTraceNewType = 208,
RplTraceClass = 209,
RplTraceReconnect = 210,
RplTraceLog = 261,
RplTraceEnd = 262,
// stats
RplStatsLinkInfo = 211, // <connection> <sendq> <sentmsg> <sentbyte> <recdmsg> <recdbyte> :<open>
RplStatsCommands = 212, // <command> <uses> <bytes>
RplStatsCLine = 213, // C <address> * <server> <port> <class>
RplStatsNLine = 214, // N <address> * <server> <port> <class>
RplStatsILine = 215, // I <ipmask> * <hostmask> <port> <class>
RplStatsKLine = 216, // k <address> * <username> <details>
RplStatsPLine = 217, // P <port> <??> <??>
RplStatsQLine = 222, // <mask> :<comment>
RplStatsELine = 223, // E <hostmask> * <username> <??> <??>
RplStatsDLine = 224, // D <ipmask> * <username> <??> <??>
RplStatsLLine = 241, // L <address> * <server> <??> <??>
RplStatsuLine = 242, // :Server Up <num> days, <time>
RplStatsoLine = 243, // o <mask> <password> <user> <??> <class>
RplStatsHLine = 244, // H <address> * <server> <??> <??>
RplStatsGLine = 247, // G <address> <timestamp> :<reason>
RplStatsULine = 248, // U <host> * <??> <??> <??>
RplStatsZLine = 249, // :info
RplStatsYLine = 218, // Y <class> <ping> <freq> <maxconnect> <sendq>
RplEndOfStats = 219, // <char> :End of /STATS report
RplStatsUptime = 242,
// GLINE
RplGLineList = 280, // <address> <timestamp> <reason> UNDERNET
RplEndOfGLineList = 281, // :End of G-line List UNDERNET
// Silence
RplSilenceList = 271, // <nick> <mask> UNDERNET/DALNET
RplEndOfSilenceList = 272, // <nick> :End of Silence List UNDERNET/DALNET
// LUser
RplLUserClient = 251, // :There are <user> users and <invis> invisible on <serv> servers
RplLUserOp = 252, // <num> :operator(s) online
RplLUserUnknown = 253, // <num> :unknown connection(s)
RplLUserChannels = 254, // <num> :channels formed
RplLUserMe = 255, // :I have <user> clients and <serv> servers
RplLUserLocalUser = 265, // :Current local users: <curr> Max: <max>
RplLUserGlobalUser = 266, // :Current global users: <curr> Max: <max>
// Errors
ErrNoSuchNick = 401, // <nickname> :No such nick
ErrNoSuchServer = 402, // <server> :No such server
ErrNoSuchChannel = 403, // <channel> :No such channel
ErrCannotSendToChan = 404, // <channel> :Cannot send to channel
ErrTooManyChannels = 405, // <channel> :You have joined too many channels
ErrWasNoSuchNick = 406, // <nickname> :There was no such nickname
ErrTooManyTargets = 407, // <target> :Duplicate recipients. No message delivered
ErrNoColors = 408, // <nickname> #<channel> :You cannot use colors on this channel. Not sent: <text> DALNET
ErrNoOrigin = 409, // :No origin specified
ErrNoRecipient = 411, // :No recipient given (<command>)
ErrNoTextToSend = 412, // :No text to send
ErrNoTopLevel = 413, // <mask> :No toplevel domain specified
ErrWildTopLevel = 414, // <mask> :Wildcard in toplevel Domain
ErrBadMask = 415,
ErrTooMuchInfo = 416, // <command> :Too many lines in the output, restrict your query UNDERNET
ErrUnknownCommand = 421, // <command> :Unknown command
ErrNoMotd = 422, // :MOTD File is missing
ErrNoAdminInfo = 423, // <server> :No administrative info available
ErrFileError = 424,
ErrNoNicknameGiven = 431, // :No nickname given
ErrErroneusNickname = 432, // <nickname> :Erroneus Nickname
ErrNickNameInUse = 433, // <nickname> :Nickname is already in use.
ErrNickCollision = 436, // <nickname> :Nickname collision KILL
ErrUnAvailResource = 437, // <channel> :Cannot change nickname while banned on channel
ErrNickTooFast = 438, // <nick> :Nick change too fast. Please wait <sec> seconds. (most)
ErrTargetTooFast = 439, // <target> :Target change too fast. Please wait <sec> seconds. DALNET/UNDERNET
ErrUserNotInChannel = 441, // <nickname> <channel> :They aren't on that channel
ErrNotOnChannel = 442, // <channel> :You're not on that channel
ErrUserOnChannel = 443, // <nickname> <channel> :is already on channel
ErrNoLogin = 444,
ErrSummonDisabled = 445, // :SUMMON has been disabled
ErrUsersDisabled = 446, // :USERS has been disabled
ErrNotRegistered = 451, // <command> :Register first.
ErrNeedMoreParams = 461, // <command> :Not enough parameters
ErrAlreadyRegistered= 462, // :You may not reregister
ErrNoPermForHost = 463,
ErrPasswdMistmatch = 464,
ErrYoureBannedCreep = 465,
ErrYouWillBeBanned = 466,
ErrKeySet = 467, // <channel> :Channel key already set
ErrServerCanChange = 468, // <channel> :Only servers can change that mode DALNET
ErrChannelIsFull = 471, // <channel> :Cannot join channel (+l)
ErrUnknownMode = 472, // <char> :is unknown mode char to me
ErrInviteOnlyChan = 473, // <channel> :Cannot join channel (+i)
ErrBannedFromChan = 474, // <channel> :Cannot join channel (+b)
ErrBadChannelKey = 475, // <channel> :Cannot join channel (+k)
ErrBadChanMask = 476,
ErrNickNotRegistered= 477, // <channel> :You need a registered nick to join that channel. DALNET
ErrBanListFull = 478, // <channel> <ban> :Channel ban/ignore list is full
ErrNoPrivileges = 481, // :Permission Denied- You're not an IRC operator
ErrChanOPrivsNeeded = 482, // <channel> :You're not channel operator
ErrCantKillServer = 483, // :You cant kill a server!
ErrRestricted = 484, // <nick> <channel> :Cannot kill, kick or deop channel service UNDERNET
ErrUniqOPrivsNeeded = 485, // <channel> :Cannot join channel (reason)
ErrNoOperHost = 491, // :No O-lines for your host
ErrUModeUnknownFlag = 501, // :Unknown MODE flag
ErrUsersDontMatch = 502, // :Cant change mode for other users
ErrSilenceListFull = 511 // <mask> :Your silence list is full UNDERNET/DALNET
}; // eo enum Reply
关于c# - 试图编写一个IRC客户端，但努力寻找有关代码和连接协议(protocol)的良好资源，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/8490084/