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- /*
- * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2011 Alexander Barton (alex@barton.de) and Contributors.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- * Please read the file COPYING, README and AUTHORS for more information.
- */
- #include "portab.h"
- /**
- * @file
- * Login and logout
- */
- #include "imp.h"
- #include <assert.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <strings.h>
- #include <signal.h>
- #include <unistd.h>
- #include "ngircd.h"
- #include "conn-func.h"
- #include "class.h"
- #include "conf.h"
- #include "channel.h"
- #include "io.h"
- #include "log.h"
- #include "messages.h"
- #include "pam.h"
- #include "parse.h"
- #include "irc.h"
- #include "irc-info.h"
- #include "irc-write.h"
- #include "exp.h"
- #include "irc-login.h"
- static bool Hello_User PARAMS(( CLIENT *Client ));
- static bool Hello_User_PostAuth PARAMS(( CLIENT *Client ));
- static void Kill_Nick PARAMS(( char *Nick, char *Reason ));
- static void Introduce_Client PARAMS((CLIENT *To, CLIENT *Client, int Type));
- static void cb_introduceClient PARAMS((CLIENT *Client, CLIENT *Prefix,
- void *i));
- #ifdef PAM
- static void cb_Read_Auth_Result PARAMS((int r_fd, UNUSED short events));
- #endif
- /**
- * Handler for the IRC "PASS" command.
- *
- * See RFC 2813 section 4.1.1, and RFC 2812 section 3.1.1.
- *
- * @param Client The client from which this command has been received.
- * @param Req Request structure with prefix and all parameters.
- * @returns CONNECTED or DISCONNECTED.
- */
- GLOBAL bool
- IRC_PASS( CLIENT *Client, REQUEST *Req )
- {
- char *type, *orig_flags;
- int protohigh, protolow;
- assert( Client != NULL );
- assert( Req != NULL );
- /* Return an error if this is not a local client */
- if (Client_Conn(Client) <= NONE)
- return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
- Client_ID(Client), Req->command);
- if (Client_Type(Client) == CLIENT_UNKNOWN && Req->argc == 1) {
- /* Not yet registered "unknown" connection, PASS with one
- * argument: either a regular client, service, or server
- * using the old RFC 1459 section 4.1.1 syntax. */
- LogDebug("Connection %d: got PASS command (RFC 1459) ...",
- Client_Conn(Client));
- } else if ((Client_Type(Client) == CLIENT_UNKNOWN ||
- Client_Type(Client) == CLIENT_UNKNOWNSERVER) &&
- (Req->argc == 3 || Req->argc == 4)) {
- /* Not yet registered "unknown" connection or outgoing server
- * link, PASS with three or four argument: server using the
- * RFC 2813 section 4.1.1 syntax. */
- LogDebug("Connection %d: got PASS command (RFC 2813, new server link) ...",
- Client_Conn(Client));
- } else if (Client_Type(Client) == CLIENT_UNKNOWN ||
- Client_Type(Client) == CLIENT_UNKNOWNSERVER) {
- /* Unregistered connection, but wrong number of arguments: */
- return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
- Client_ID(Client), Req->command);
- } else {
- /* Registered connection, PASS command is not allowed! */
- return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
- Client_ID(Client));
- }
- Client_SetPassword(Client, Req->argv[0]);
- /* Protocol version */
- if (Req->argc >= 2 && strlen(Req->argv[1]) >= 4) {
- int c2, c4;
- c2 = Req->argv[1][2];
- c4 = Req->argv[1][4];
- Req->argv[1][4] = '\0';
- protolow = atoi(&Req->argv[1][2]);
- Req->argv[1][2] = '\0';
- protohigh = atoi(Req->argv[1]);
- Req->argv[1][2] = c2;
- Req->argv[1][4] = c4;
- Client_SetType(Client, CLIENT_GOTPASS_2813);
- } else {
- protohigh = protolow = 0;
- Client_SetType(Client, CLIENT_GOTPASS);
- }
- /* Protocol type, see doc/Protocol.txt */
- if (Req->argc >= 2 && strlen(Req->argv[1]) > 4)
- type = &Req->argv[1][4];
- else
- type = NULL;
- /* Protocol flags/options */
- if (Req->argc >= 4)
- orig_flags = Req->argv[3];
- else
- orig_flags = "";
- /* Implementation, version and IRC+ flags */
- if (Req->argc >= 3) {
- char *impl, *ptr, *serverver, *flags;
- impl = Req->argv[2];
- ptr = strchr(impl, '|');
- if (ptr)
- *ptr = '\0';
- if (type && strcmp(type, PROTOIRCPLUS) == 0) {
- /* The peer seems to be a server which supports the
- * IRC+ protocol (see doc/Protocol.txt). */
- serverver = ptr ? ptr + 1 : "?";
- flags = strchr(ptr ? serverver : impl, ':');
- if (flags) {
- *flags = '\0';
- flags++;
- } else
- flags = "";
- Log(LOG_INFO,
- "Peer on conenction %d announces itself as %s-%s using protocol %d.%d/IRC+ (flags: \"%s\").",
- Client_Conn(Client), impl, serverver,
- protohigh, protolow, flags);
- } else {
- /* The peer seems to be a server supporting the
- * "original" IRC protocol (RFC 2813). */
- if (strchr(orig_flags, 'Z'))
- flags = "Z";
- else
- flags = "";
- Log(LOG_INFO,
- "Peer on connection %d announces itself as \"%s\" using protocol %d.%d (flags: \"%s\").",
- Client_Conn(Client), impl,
- protohigh, protolow, flags);
- }
- Client_SetFlags(Client, flags);
- }
- return CONNECTED;
- } /* IRC_PASS */
- /**
- * Handler for the IRC "NICK" command.
- *
- * See RFC 2812, 3.1.2 "Nick message", and RFC 2813, 4.1.3 "Nick".
- *
- * This function implements the IRC command "NICK" which is used to register
- * with the server, to change already registered nicknames and to introduce
- * new users which are connected to other servers.
- *
- * @param Client The client from which this command has been received.
- * @param Req Request structure with prefix and all parameters.
- * @returns CONNECTED or DISCONNECTED.
- */
- GLOBAL bool
- IRC_NICK( CLIENT *Client, REQUEST *Req )
- {
- CLIENT *intr_c, *target, *c;
- char *nick, *user, *hostname, *modes, *info;
- int token, hops;
- assert( Client != NULL );
- assert( Req != NULL );
- /* Some IRC clients, for example BitchX, send the NICK and USER
- * commands in the wrong order ... */
- if(Client_Type(Client) == CLIENT_UNKNOWN
- || Client_Type(Client) == CLIENT_GOTPASS
- || Client_Type(Client) == CLIENT_GOTNICK
- #ifndef STRICT_RFC
- || Client_Type(Client) == CLIENT_GOTUSER
- #endif
- || Client_Type(Client) == CLIENT_USER
- || Client_Type(Client) == CLIENT_SERVICE
- || (Client_Type(Client) == CLIENT_SERVER && Req->argc == 1))
- {
- /* User registration or change of nickname */
- /* Wrong number of arguments? */
- if( Req->argc != 1 )
- return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
- Client_ID( Client ),
- Req->command );
- /* Search "target" client */
- if( Client_Type( Client ) == CLIENT_SERVER )
- {
- target = Client_Search( Req->prefix );
- if( ! target )
- return IRC_WriteStrClient( Client,
- ERR_NOSUCHNICK_MSG,
- Client_ID( Client ),
- Req->argv[0] );
- }
- else
- {
- /* Is this a restricted client? */
- if( Client_HasMode( Client, 'r' ))
- return IRC_WriteStrClient( Client,
- ERR_RESTRICTED_MSG,
- Client_ID( Client ));
- target = Client;
- }
- #ifndef STRICT_RFC
- /* If the clients tries to change to its own nickname we won't
- * do anything. This is how the original ircd behaves and some
- * clients (for example Snak) expect it to be like this.
- * But I doubt that this is "really the right thing" ... */
- if( strcmp( Client_ID( target ), Req->argv[0] ) == 0 )
- return CONNECTED;
- #endif
- /* Check that the new nickname is available. Special case:
- * the client only changes from/to upper to lower case. */
- if( strcasecmp( Client_ID( target ), Req->argv[0] ) != 0 )
- {
- if( ! Client_CheckNick( target, Req->argv[0] ))
- return CONNECTED;
- }
- if (Client_Type(target) != CLIENT_USER &&
- Client_Type(target) != CLIENT_SERVICE &&
- Client_Type(target) != CLIENT_SERVER) {
- /* New client */
- LogDebug("Connection %d: got valid NICK command ...",
- Client_Conn( Client ));
- /* Register new nickname of this client */
- Client_SetID( target, Req->argv[0] );
- #ifndef STRICT_RFC
- if (Conf_AuthPing) {
- Conn_SetAuthPing(Client_Conn(Client), rand());
- IRC_WriteStrClient(Client, "PING :%ld",
- Conn_GetAuthPing(Client_Conn(Client)));
- LogDebug("Connection %d: sent AUTH PING %ld ...",
- Client_Conn(Client),
- Conn_GetAuthPing(Client_Conn(Client)));
- }
- #endif
- /* If we received a valid USER command already then
- * register the new client! */
- if( Client_Type( Client ) == CLIENT_GOTUSER )
- return Hello_User( Client );
- else
- Client_SetType( Client, CLIENT_GOTNICK );
- } else {
- /* Nickname change */
- if (Client_Conn(target) > NONE) {
- /* Local client */
- Log(LOG_INFO,
- "%s \"%s\" changed nick (connection %d): \"%s\" -> \"%s\".",
- Client_TypeText(target), Client_Mask(target),
- Client_Conn(target), Client_ID(target),
- Req->argv[0]);
- Conn_UpdateIdle(Client_Conn(target));
- } else {
- /* Remote client */
- LogDebug("%s \"%s\" changed nick: \"%s\" -> \"%s\".",
- Client_TypeText(target),
- Client_Mask(target), Client_ID(target),
- Req->argv[0]);
- }
- /* Inform all users and servers (which have to know)
- * of this nickname change */
- if( Client_Type( Client ) == CLIENT_USER )
- IRC_WriteStrClientPrefix( Client, Client,
- "NICK :%s",
- Req->argv[0] );
- IRC_WriteStrServersPrefix( Client, target,
- "NICK :%s", Req->argv[0] );
- IRC_WriteStrRelatedPrefix( target, target, false,
- "NICK :%s", Req->argv[0] );
- /* Register old nickname for WHOWAS queries */
- Client_RegisterWhowas( target );
- /* Save new nickname */
- Client_SetID( target, Req->argv[0] );
- IRC_SetPenalty( target, 2 );
- }
- return CONNECTED;
- } else if(Client_Type(Client) == CLIENT_SERVER ||
- Client_Type(Client) == CLIENT_SERVICE) {
- /* Server or service introduces new client */
- /* Bad number of parameters? */
- if (Req->argc != 2 && Req->argc != 7)
- return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
- Client_ID(Client), Req->command);
- if (Req->argc >= 7) {
- /* RFC 2813 compatible syntax */
- nick = Req->argv[0];
- hops = atoi(Req->argv[1]);
- user = Req->argv[2];
- hostname = Req->argv[3];
- token = atoi(Req->argv[4]);
- modes = Req->argv[5] + 1;
- info = Req->argv[6];
- } else {
- /* RFC 1459 compatible syntax */
- nick = Req->argv[0];
- hops = 1;
- user = Req->argv[0];
- hostname = Client_ID(Client);
- token = atoi(Req->argv[1]);
- modes = "";
- info = Req->argv[0];
- }
- c = Client_Search(nick);
- if(c) {
- /*
- * the new nick is already present on this server:
- * the new and the old one have to be disconnected now.
- */
- Log( LOG_ERR, "Server %s introduces already registered nick \"%s\"!", Client_ID( Client ), Req->argv[0] );
- Kill_Nick( Req->argv[0], "Nick collision" );
- return CONNECTED;
- }
- /* Find the Server this client is connected to */
- intr_c = Client_GetFromToken(Client, token);
- if( ! intr_c )
- {
- Log( LOG_ERR, "Server %s introduces nick \"%s\" on unknown server!?", Client_ID( Client ), Req->argv[0] );
- Kill_Nick( Req->argv[0], "Unknown server" );
- return CONNECTED;
- }
- c = Client_NewRemoteUser(intr_c, nick, hops, user, hostname,
- token, modes, info, true);
- if( ! c )
- {
- /* out of memory, need to disconnect client to keep network state consistent */
- Log( LOG_ALERT, "Can't create client structure! (on connection %d)", Client_Conn( Client ));
- Kill_Nick( Req->argv[0], "Server error" );
- return CONNECTED;
- }
- /* RFC 2813: client is now fully registered, inform all the
- * other servers about the new user.
- * RFC 1459: announce the new client only after receiving the
- * USER command, first we need more information! */
- if (Req->argc < 7) {
- LogDebug("Client \"%s\" is being registered (RFC 1459) ...",
- Client_Mask(c));
- Client_SetType(c, CLIENT_GOTNICK);
- } else
- Introduce_Client(Client, c, CLIENT_USER);
- return CONNECTED;
- }
- else return IRC_WriteStrClient( Client, ERR_ALREADYREGISTRED_MSG, Client_ID( Client ));
- } /* IRC_NICK */
- /**
- * Handler for the IRC "USER" command.
- *
- * See RFC 2812, 3.1.3 "User message".
- *
- * @param Client The client from which this command has been received.
- * @param Req Request structure with prefix and all parameters.
- * @returns CONNECTED or DISCONNECTED.
- */
- GLOBAL bool
- IRC_USER(CLIENT * Client, REQUEST * Req)
- {
- CLIENT *c;
- #ifdef IDENTAUTH
- char *ptr;
- #endif
- assert(Client != NULL);
- assert(Req != NULL);
- if (Client_Type(Client) == CLIENT_GOTNICK ||
- #ifndef STRICT_RFC
- Client_Type(Client) == CLIENT_UNKNOWN ||
- #endif
- Client_Type(Client) == CLIENT_GOTPASS)
- {
- /* New connection */
- if (Req->argc != 4)
- return IRC_WriteStrClient(Client,
- ERR_NEEDMOREPARAMS_MSG,
- Client_ID(Client),
- Req->command);
- /* User name */
- #ifdef IDENTAUTH
- ptr = Client_User(Client);
- if (!ptr || !*ptr || *ptr == '~')
- Client_SetUser(Client, Req->argv[0], false);
- #else
- Client_SetUser(Client, Req->argv[0], false);
- #endif
- Client_SetOrigUser(Client, Req->argv[0]);
- /* "Real name" or user info text: Don't set it to the empty
- * string, the original ircd can't deal with such "real names"
- * (e. g. "USER user * * :") ... */
- if (*Req->argv[3])
- Client_SetInfo(Client, Req->argv[3]);
- else
- Client_SetInfo(Client, "-");
- LogDebug("Connection %d: got valid USER command ...",
- Client_Conn(Client));
- if (Client_Type(Client) == CLIENT_GOTNICK)
- return Hello_User(Client);
- else
- Client_SetType(Client, CLIENT_GOTUSER);
- return CONNECTED;
- } else if (Client_Type(Client) == CLIENT_SERVER ||
- Client_Type(Client) == CLIENT_SERVICE) {
- /* Server/service updating an user */
- if (Req->argc != 4)
- return IRC_WriteStrClient(Client,
- ERR_NEEDMOREPARAMS_MSG,
- Client_ID(Client),
- Req->command);
- c = Client_Search(Req->prefix);
- if (!c)
- return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
- Client_ID(Client),
- Req->prefix);
- Client_SetUser(c, Req->argv[0], true);
- Client_SetOrigUser(c, Req->argv[0]);
- Client_SetHostname(c, Req->argv[1]);
- Client_SetInfo(c, Req->argv[3]);
- LogDebug("Connection %d: got valid USER command for \"%s\".",
- Client_Conn(Client), Client_Mask(c));
- /* RFC 1459 style user registration?
- * Introduce client to network: */
- if (Client_Type(c) == CLIENT_GOTNICK)
- Introduce_Client(Client, c, CLIENT_USER);
- return CONNECTED;
- } else if (Client_Type(Client) == CLIENT_USER) {
- /* Already registered connection */
- return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
- Client_ID(Client));
- } else {
- /* Unexpected/invalid connection state? */
- return IRC_WriteStrClient(Client, ERR_NOTREGISTERED_MSG,
- Client_ID(Client));
- }
- } /* IRC_USER */
- /**
- * Handler for the IRC "SERVICE" command.
- *
- * This function implements IRC Services registration using the SERVICE command
- * defined in RFC 2812 3.1.6 and RFC 2813 4.1.4.
- *
- * At the moment ngIRCd doesn't support directly linked services, so this
- * function returns ERR_ERRONEUSNICKNAME when the SERVICE command has not been
- * received from a peer server.
- *
- * @param Client The client from which this command has been received.
- * @param Req Request structure with prefix and all parameters.
- * @returns CONNECTED or DISCONNECTED..
- */
- GLOBAL bool
- IRC_SERVICE(CLIENT *Client, REQUEST *Req)
- {
- CLIENT *c, *intr_c;
- char *nick, *user, *host, *info, *modes, *ptr;
- int token, hops;
- assert(Client != NULL);
- assert(Req != NULL);
- if (Client_Type(Client) != CLIENT_GOTPASS &&
- Client_Type(Client) != CLIENT_SERVER)
- return IRC_WriteStrClient(Client, ERR_ALREADYREGISTRED_MSG,
- Client_ID(Client));
- if (Req->argc != 6)
- return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
- Client_ID(Client), Req->command);
- if (Client_Type(Client) != CLIENT_SERVER)
- return IRC_WriteStrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
- Client_ID(Client), Req->argv[0]);
- /* Bad number of parameters? */
- if (Req->argc != 6)
- return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
- Client_ID(Client), Req->command);
- nick = Req->argv[0];
- user = NULL; host = NULL;
- token = atoi(Req->argv[1]);
- hops = atoi(Req->argv[4]);
- info = Req->argv[5];
- /* Validate service name ("nick name") */
- c = Client_Search(nick);
- if(c) {
- /* Nick name collission: disconnect (KILL) both clients! */
- Log(LOG_ERR, "Server %s introduces already registered service \"%s\"!",
- Client_ID(Client), nick);
- Kill_Nick(nick, "Nick collision");
- return CONNECTED;
- }
- /* Get the server to which the service is connected */
- intr_c = Client_GetFromToken(Client, token);
- if (! intr_c) {
- Log(LOG_ERR, "Server %s introduces service \"%s\" on unknown server!?",
- Client_ID(Client), nick);
- Kill_Nick(nick, "Unknown server");
- return CONNECTED;
- }
- /* Get user and host name */
- ptr = strchr(nick, '@');
- if (ptr) {
- *ptr = '\0';
- host = ++ptr;
- }
- if (!host)
- host = Client_Hostname(intr_c);
- ptr = strchr(nick, '!');
- if (ptr) {
- *ptr = '\0';
- user = ++ptr;
- }
- if (!user)
- user = nick;
- /* According to RFC 2812/2813 parameter 4 <type> "is currently reserved
- * for future usage"; but we use it to transfer the modes and check
- * that the first character is a '+' sign and ignore it otherwise. */
- modes = (Req->argv[3][0] == '+') ? ++Req->argv[3] : "";
- c = Client_NewRemoteUser(intr_c, nick, hops, user, host,
- token, modes, info, true);
- if (! c) {
- /* Couldn't create client structure, so KILL the service to
- * keep network status consistent ... */
- Log(LOG_ALERT, "Can't create client structure! (on connection %d)",
- Client_Conn(Client));
- Kill_Nick(nick, "Server error");
- return CONNECTED;
- }
- Introduce_Client(Client, c, CLIENT_SERVICE);
- return CONNECTED;
- } /* IRC_SERVICE */
- /**
- * Handler for the IRC "WEBIRC" command.
- *
- * See doc/Protocol.txt, section II.4:
- * "Update webchat/proxy client information".
- *
- * @param Client The client from which this command has been received.
- * @param Req Request structure with prefix and all parameters.
- * @returns CONNECTED or DISCONNECTED.
- */
- GLOBAL bool
- IRC_WEBIRC(CLIENT *Client, REQUEST *Req)
- {
- /* Exactly 4 parameters are requited */
- if (Req->argc != 4)
- return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
- Client_ID(Client), Req->command);
- if (!Conf_WebircPwd[0] || strcmp(Req->argv[0], Conf_WebircPwd) != 0)
- return IRC_WriteStrClient(Client, ERR_PASSWDMISMATCH_MSG,
- Client_ID(Client));
- LogDebug("Connection %d: got valid WEBIRC command: user=%s, host=%s, ip=%s",
- Client_Conn(Client), Req->argv[1], Req->argv[2], Req->argv[3]);
- Client_SetUser(Client, Req->argv[1], true);
- Client_SetOrigUser(Client, Req->argv[1]);
- Client_SetHostname(Client, Req->argv[2]);
- return CONNECTED;
- } /* IRC_WEBIRC */
- /**
- * Handler for the IRC "QUIT" command.
- *
- * See RFC 2812, 3.1.7 "Quit", and RFC 2813, 4.1.5 "Quit".
- *
- * @param Client The client from which this command has been received.
- * @param Req Request structure with prefix and all parameters.
- * @returns CONNECTED or DISCONNECTED.
- */
- GLOBAL bool
- IRC_QUIT( CLIENT *Client, REQUEST *Req )
- {
- CLIENT *target;
- char quitmsg[LINE_LEN];
- assert(Client != NULL);
- assert(Req != NULL);
- /* Wrong number of arguments? */
- if (Req->argc > 1)
- return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
- Client_ID(Client), Req->command);
- if (Req->argc == 1)
- strlcpy(quitmsg, Req->argv[0], sizeof quitmsg);
- if (Client_Type(Client) == CLIENT_SERVER) {
- /* Server */
- target = Client_Search(Req->prefix);
- if (!target) {
- Log(LOG_WARNING,
- "Got QUIT from %s for unknown client!?",
- Client_ID(Client));
- return CONNECTED;
- }
- if (target != Client) {
- Client_Destroy(target, "Got QUIT command.",
- Req->argc == 1 ? quitmsg : NULL, true);
- return CONNECTED;
- } else {
- Conn_Close(Client_Conn(Client), "Got QUIT command.",
- Req->argc == 1 ? quitmsg : NULL, true);
- return DISCONNECTED;
- }
- } else {
- if (Req->argc == 1 && quitmsg[0] != '\"') {
- /* " " to avoid confusion */
- strlcpy(quitmsg, "\"", sizeof quitmsg);
- strlcat(quitmsg, Req->argv[0], sizeof quitmsg-1);
- strlcat(quitmsg, "\"", sizeof quitmsg );
- }
- /* User, Service, or not yet registered */
- Conn_Close(Client_Conn(Client), "Got QUIT command.",
- Req->argc == 1 ? quitmsg : NULL, true);
- return DISCONNECTED;
- }
- } /* IRC_QUIT */
- #ifndef STRICT_RFC
- /**
- * Handler for HTTP command, e.g. GET and POST
- *
- * We handle these commands here to avoid the quite long timeout when
- * some user tries to access this IRC daemon using an web browser ...
- *
- * @param Client The client from which this command has been received.
- * @param Req Request structure with prefix and all parameters.
- * @returns CONNECTED or DISCONNECTED.
- */
- GLOBAL bool
- IRC_QUIT_HTTP( CLIENT *Client, REQUEST *Req )
- {
- Req->argc = 1;
- Req->argv[0] = "Oops, HTTP request received? This is IRC!";
- return IRC_QUIT(Client, Req);
- } /* IRC_QUIT_HTTP */
- #endif
- /**
- * Handler for the IRC "PING" command.
- *
- * See RFC 2812, 3.7.2 "Ping message".
- *
- * @param Client The client from which this command has been received.
- * @param Req Request structure with prefix and all parameters.
- * @returns CONNECTED or DISCONNECTED.
- */
- GLOBAL bool
- IRC_PING(CLIENT *Client, REQUEST *Req)
- {
- CLIENT *target, *from;
- assert(Client != NULL);
- assert(Req != NULL);
- if (Req->argc < 1)
- return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
- Client_ID(Client));
- #ifdef STRICT_RFC
- /* Don't ignore additional arguments when in "strict" mode */
- if (Req->argc > 2)
- return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
- Client_ID(Client), Req->command);
- #endif
- if (Req->argc > 1) {
- /* A target has been specified ... */
- target = Client_Search(Req->argv[1]);
- if (!target || Client_Type(target) != CLIENT_SERVER)
- return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
- Client_ID(Client), Req->argv[1]);
- if (target != Client_ThisServer()) {
- /* Ok, we have to forward the PING */
- if (Client_Type(Client) == CLIENT_SERVER)
- from = Client_Search(Req->prefix);
- else
- from = Client;
- if (!from)
- return IRC_WriteStrClient(Client,
- ERR_NOSUCHSERVER_MSG,
- Client_ID(Client), Req->prefix);
- return IRC_WriteStrClientPrefix(target, from,
- "PING %s :%s", Req->argv[0],
- Req->argv[1] );
- }
- }
- if (Client_Type(Client) == CLIENT_SERVER) {
- if (Req->prefix)
- from = Client_Search(Req->prefix);
- else
- from = Client;
- } else
- from = Client_ThisServer();
- if (!from)
- return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
- Client_ID(Client), Req->prefix);
- Log(LOG_DEBUG, "Connection %d: got PING, sending PONG ...",
- Client_Conn(Client));
- #ifdef STRICT_RFC
- return IRC_WriteStrClient(Client, "PONG %s :%s",
- Client_ID(from), Client_ID(Client));
- #else
- /* Some clients depend on the argument being returned in the PONG
- * reply (not mentioned in any RFC, though) */
- return IRC_WriteStrClient(Client, "PONG %s :%s",
- Client_ID(from), Req->argv[0]);
- #endif
- } /* IRC_PING */
- /**
- * Handler for the IRC "PONG" command.
- *
- * See RFC 2812, 3.7.3 "Pong message".
- *
- * @param Client The client from which this command has been received.
- * @param Req Request structure with prefix and all parameters.
- * @returns CONNECTED or DISCONNECTED.
- */
- GLOBAL bool
- IRC_PONG(CLIENT *Client, REQUEST *Req)
- {
- CLIENT *target, *from;
- CONN_ID conn;
- #ifndef STRICT_RFC
- long auth_ping;
- #endif
- char *s;
- assert(Client != NULL);
- assert(Req != NULL);
- /* Wrong number of arguments? */
- if (Req->argc < 1) {
- if (Client_Type(Client) == CLIENT_USER)
- return IRC_WriteStrClient(Client, ERR_NOORIGIN_MSG,
- Client_ID(Client));
- else
- return CONNECTED;
- }
- if (Req->argc > 2) {
- if (Client_Type(Client) == CLIENT_USER)
- return IRC_WriteStrClient(Client,
- ERR_NEEDMOREPARAMS_MSG,
- Client_ID(Client),
- Req->command);
- else
- return CONNECTED;
- }
- /* Forward? */
- if (Req->argc == 2 && Client_Type(Client) == CLIENT_SERVER) {
- target = Client_Search(Req->argv[0]);
- if (!target)
- return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
- Client_ID(Client), Req->argv[0]);
- from = Client_Search(Req->prefix);
- if (target != Client_ThisServer() && target != from) {
- /* Ok, we have to forward the message. */
- if (!from)
- return IRC_WriteStrClient(Client,
- ERR_NOSUCHSERVER_MSG,
- Client_ID(Client), Req->prefix);
- if (Client_Type(Client_NextHop(target)) != CLIENT_SERVER)
- s = Client_ID(from);
- else
- s = Req->argv[0];
- return IRC_WriteStrClientPrefix(target, from,
- "PONG %s :%s", s, Req->argv[1]);
- }
- }
- /* The connection timestamp has already been updated when the data has
- * been read from so socket, so we don't need to update it here. */
- conn = Client_Conn(Client);
- #ifndef STRICT_RFC
- /* Check authentication PING-PONG ... */
- auth_ping = Conn_GetAuthPing(conn);
- if (auth_ping) {
- LogDebug("AUTH PONG: waiting for token \"%ld\", got \"%s\" ...",
- auth_ping, Req->argv[0]);
- if (auth_ping == atoi(Req->argv[0])) {
- Conn_SetAuthPing(conn, 0);
- if (Client_Type(Client) == CLIENT_WAITAUTHPING)
- Hello_User(Client);
- } else
- if (!IRC_WriteStrClient(Client,
- "To connect, type /QUOTE PONG %ld",
- auth_ping))
- return DISCONNECTED;
- }
- #endif
- if (Client_Type(Client) == CLIENT_SERVER && Conn_LastPing(conn) == 0) {
- Log(LOG_INFO,
- "Synchronization with \"%s\" done (connection %d): %ld seconds [%ld users, %ld channels]",
- Client_ID(Client), conn, time(NULL) - Conn_GetSignon(conn),
- Client_UserCount(), Channel_CountVisible(NULL));
- Conn_UpdatePing(conn);
- } else
- LogDebug("Connection %d: received PONG. Lag: %ld seconds.",
- conn, time(NULL) - Conn_LastPing(conn));
- return CONNECTED;
- } /* IRC_PONG */
- /**
- * Initiate client registration.
- *
- * This function is called after the daemon received the required NICK and
- * USER commands of a new client. If the daemon is compiled with support for
- * PAM, the authentication sub-processs is forked; otherwise the global server
- * password is checked.
- *
- * @param Client The client logging in.
- * @returns CONNECTED or DISCONNECTED.
- */
- static bool
- Hello_User(CLIENT * Client)
- {
- #ifdef PAM
- int pipefd[2], result;
- pid_t pid;
- #endif
- CONN_ID conn;
- assert(Client != NULL);
- conn = Client_Conn(Client);
- #ifndef STRICT_RFC
- if (Conf_AuthPing) {
- /* Did we receive the "auth PONG" already? */
- if (Conn_GetAuthPing(conn)) {
- Client_SetType(Client, CLIENT_WAITAUTHPING);
- LogDebug("Connection %d: Waiting for AUTH PONG ...", conn);
- return CONNECTED;
- }
- }
- #endif
- #ifdef PAM
- if (!Conf_PAM) {
- /* Don't do any PAM authentication at all, instead emulate
- * the beahiour of the daemon compiled without PAM support:
- * because there can't be any "server password", all
- * passwords supplied are classified as "wrong". */
- if(Client_Password(Client)[0] == '\0')
- return Hello_User_PostAuth(Client);
- Client_Reject(Client, "Non-empty password", false);
- return DISCONNECTED;
- }
- if (Conf_PAMIsOptional && strcmp(Client_Password(Client), "") == 0) {
- /* Clients are not required to send a password and to be PAM-
- * authenticated at all. If not, they won't become "identified"
- * and keep the "~" in their supplied user name.
- * Therefore it is sensible to either set Conf_PAMisOptional or
- * to enable IDENT lookups -- not both. */
- return Hello_User_PostAuth(Client);
- }
- /* Fork child process for PAM authentication; and make sure that the
- * process timeout is set higher than the login timeout! */
- pid = Proc_Fork(Conn_GetProcStat(conn), pipefd,
- cb_Read_Auth_Result, Conf_PongTimeout + 1);
- if (pid > 0) {
- LogDebug("Authenticator for connection %d created (PID %d).",
- conn, pid);
- return CONNECTED;
- } else {
- /* Sub process */
- Log_Init_Subprocess("Auth");
- Conn_CloseAllSockets(NONE);
- result = PAM_Authenticate(Client);
- if (write(pipefd[1], &result, sizeof(result)) != sizeof(result))
- Log_Subprocess(LOG_ERR,
- "Failed to pipe result to parent!");
- Log_Exit_Subprocess("Auth");
- exit(0);
- }
- #else
- /* Check global server password ... */
- if (strcmp(Client_Password(Client), Conf_ServerPwd) != 0) {
- /* Bad password! */
- Client_Reject(Client, "Bad server password", false);
- return DISCONNECTED;
- }
- return Hello_User_PostAuth(Client);
- #endif
- }
- #ifdef PAM
- /**
- * Read result of the authenticatior sub-process from pipe
- *
- * @param r_fd File descriptor of the pipe.
- * @param events (ignored IO specification)
- */
- static void
- cb_Read_Auth_Result(int r_fd, UNUSED short events)
- {
- CONN_ID conn;
- CLIENT *client;
- int result;
- size_t len;
- PROC_STAT *proc;
- LogDebug("Auth: Got callback on fd %d, events %d", r_fd, events);
- conn = Conn_GetFromProc(r_fd);
- if (conn == NONE) {
- /* Ops, none found? Probably the connection has already
- * been closed!? We'll ignore that ... */
- io_close(r_fd);
- LogDebug("Auth: Got callback for unknown connection!?");
- return;
- }
- proc = Conn_GetProcStat(conn);
- client = Conn_GetClient(conn);
- /* Read result from pipe */
- len = Proc_Read(proc, &result, sizeof(result));
- Proc_Close(proc);
- if (len == 0)
- return;
- if (len != sizeof(result)) {
- Log(LOG_CRIT, "Auth: Got malformed result!");
- Client_Reject(client, "Internal error", false);
- return;
- }
- if (result == true) {
- Client_SetUser(client, Client_OrigUser(client), true);
- (void)Hello_User_PostAuth(client);
- } else
- Client_Reject(client, "Bad password", false);
- }
- #endif
- /**
- * Finish client registration.
- *
- * Introduce the new client to the network and send all "hello messages"
- * to it after authentication has been succeeded.
- *
- * @param Client The client logging in.
- * @returns CONNECTED or DISCONNECTED.
- */
- static bool
- Hello_User_PostAuth(CLIENT *Client)
- {
- assert(Client != NULL);
- if (Class_HandleServerBans(Client) != CONNECTED)
- return DISCONNECTED;
- Introduce_Client(NULL, Client, CLIENT_USER);
- if (!IRC_WriteStrClient
- (Client, RPL_WELCOME_MSG, Client_ID(Client), Client_Mask(Client)))
- return false;
- if (!IRC_WriteStrClient
- (Client, RPL_YOURHOST_MSG, Client_ID(Client),
- Client_ID(Client_ThisServer()), PACKAGE_VERSION, TARGET_CPU,
- TARGET_VENDOR, TARGET_OS))
- return false;
- if (!IRC_WriteStrClient
- (Client, RPL_CREATED_MSG, Client_ID(Client), NGIRCd_StartStr))
- return false;
- if (!IRC_WriteStrClient
- (Client, RPL_MYINFO_MSG, Client_ID(Client),
- Client_ID(Client_ThisServer()), PACKAGE_VERSION, USERMODES,
- CHANMODES))
- return false;
- /* Features supported by this server (005 numeric, ISUPPORT),
- * see <http://www.irc.org/tech_docs/005.html> for details. */
- if (!IRC_Send_ISUPPORT(Client))
- return DISCONNECTED;
- if (!IRC_Send_LUSERS(Client))
- return DISCONNECTED;
- if (!IRC_Show_MOTD(Client))
- return DISCONNECTED;
- /* Suspend the client for a second ... */
- IRC_SetPenalty(Client, 1);
- return CONNECTED;
- }
- /**
- * Kill all users with a specific nick name in the network.
- *
- * @param Nick Nick name.
- * @param Reason Reason for the KILL.
- */
- static void
- Kill_Nick(char *Nick, char *Reason)
- {
- REQUEST r;
- assert (Nick != NULL);
- assert (Reason != NULL);
- r.prefix = NULL;
- r.argv[0] = Nick;
- r.argv[1] = Reason;
- r.argc = 2;
- Log(LOG_ERR, "User(s) with nick \"%s\" will be disconnected: %s",
- Nick, Reason);
- IRC_KILL(Client_ThisServer(), &r);
- } /* Kill_Nick */
- /**
- * Introduce a new user or service client in the network.
- *
- * @param From Remote server introducing the client or NULL (local).
- * @param Client New client.
- * @param Type Type of the client (CLIENT_USER or CLIENT_SERVICE).
- */
- static void
- Introduce_Client(CLIENT *From, CLIENT *Client, int Type)
- {
- /* Set client type (user or service) */
- Client_SetType(Client, Type);
- if (From) {
- if (Conf_IsService(Conf_GetServer(Client_Conn(From)),
- Client_ID(Client)))
- Client_SetType(Client, CLIENT_SERVICE);
- LogDebug("%s \"%s\" (+%s) registered (via %s, on %s, %d hop%s).",
- Client_TypeText(Client), Client_Mask(Client),
- Client_Modes(Client), Client_ID(From),
- Client_ID(Client_Introducer(Client)),
- Client_Hops(Client), Client_Hops(Client) > 1 ? "s": "");
- } else {
- Log(LOG_NOTICE, "%s \"%s\" registered (connection %d).",
- Client_TypeText(Client), Client_Mask(Client),
- Client_Conn(Client));
- Log_ServerNotice('c', "Client connecting: %s (%s@%s) [%s] - %s",
- Client_ID(Client), Client_User(Client),
- Client_Hostname(Client),
- Conn_IPA(Client_Conn(Client)),
- Client_TypeText(Client));
- }
- /* Inform other servers */
- IRC_WriteStrServersPrefixFlag_CB(From,
- From != NULL ? From : Client_ThisServer(),
- '\0', cb_introduceClient, (void *)Client);
- } /* Introduce_Client */
- /**
- * Introduce a new user or service client to a remote server.
- *
- * This function differentiates between RFC1459 and RFC2813 server links and
- * generates the appropriate commands to register the new user or service.
- *
- * @param To The remote server to inform.
- * @param Prefix Prefix for the generated commands.
- * @param data CLIENT structure of the new client.
- */
- static void
- cb_introduceClient(CLIENT *To, CLIENT *Prefix, void *data)
- {
- CLIENT *c = (CLIENT *)data;
- CONN_ID conn;
- char *modes, *user, *host;
- modes = Client_Modes(c);
- user = Client_User(c) ? Client_User(c) : "-";
- host = Client_Hostname(c) ? Client_Hostname(c) : "-";
- conn = Client_Conn(To);
- if (Conn_Options(conn) & CONN_RFC1459) {
- /* RFC 1459 mode: separate NICK and USER commands */
- Conn_WriteStr(conn, "NICK %s :%d", Client_ID(c),
- Client_Hops(c) + 1);
- Conn_WriteStr(conn, ":%s USER %s %s %s :%s",
- Client_ID(c), user, host,
- Client_ID(Client_Introducer(c)), Client_Info(c));
- if (modes[0])
- Conn_WriteStr(conn, ":%s MODE %s +%s",
- Client_ID(c), Client_ID(c), modes);
- } else {
- /* RFC 2813 mode: one combined NICK or SERVICE command */
- if (Client_Type(c) == CLIENT_SERVICE
- && strchr(Client_Flags(To), 'S'))
- IRC_WriteStrClientPrefix(To, Prefix,
- "SERVICE %s %d * +%s %d :%s",
- Client_Mask(c),
- Client_MyToken(Client_Introducer(c)),
- Client_Modes(c), Client_Hops(c) + 1,
- Client_Info(c));
- else
- IRC_WriteStrClientPrefix(To, Prefix,
- "NICK %s %d %s %s %d +%s :%s",
- Client_ID(c), Client_Hops(c) + 1,
- user, host,
- Client_MyToken(Client_Introducer(c)),
- modes, Client_Info(c));
- }
- } /* cb_introduceClient */
- /* -eof- */
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