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- /*
- * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2014 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
- * IRC commands for server links
- */
- #include <assert.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <strings.h>
- #include "conn-func.h"
- #include "conn-zip.h"
- #include "conf.h"
- #include "channel.h"
- #include "log.h"
- #include "messages.h"
- #include "parse.h"
- #include "numeric.h"
- #include "ngircd.h"
- #include "irc.h"
- #include "irc-info.h"
- #include "irc-write.h"
- #include "op.h"
- #include "irc-server.h"
- /**
- * Handler for the IRC "SERVER" command.
- *
- * @param Client The client from which this command has been received.
- * @param Req Request structure with prefix and all parameters.
- * @return CONNECTED or DISCONNECTED.
- */
- GLOBAL bool
- IRC_SERVER( CLIENT *Client, REQUEST *Req )
- {
- char str[100];
- CLIENT *from, *c;
- int i;
- assert( Client != NULL );
- assert( Req != NULL );
- /* Return an error if this is not a local client */
- if (Client_Conn(Client) <= NONE)
- return IRC_WriteErrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
- Client_ID(Client), Req->command);
- if (Client_Type(Client) == CLIENT_GOTPASS ||
- Client_Type(Client) == CLIENT_GOTPASS_2813) {
- /* We got a PASS command from the peer, and now a SERVER
- * command: the peer tries to register itself as a server. */
- LogDebug("Connection %d: got SERVER command (new server link) ...",
- Client_Conn(Client));
- if (Req->argc != 2 && Req->argc != 3)
- return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
- Client_ID(Client),
- Req->command);
- /* Get configuration index of new remote server ... */
- for (i = 0; i < MAX_SERVERS; i++)
- if (strcasecmp(Req->argv[0], Conf_Server[i].name) == 0)
- break;
- /* Make sure the remote server is configured here */
- if (i >= MAX_SERVERS) {
- Log(LOG_ERR,
- "Connection %d: Server \"%s\" not configured here!",
- Client_Conn(Client), Req->argv[0]);
- Conn_Close(Client_Conn(Client), NULL,
- "Server not configured here", true);
- return DISCONNECTED;
- }
- /* Check server password */
- if (strcmp(Conn_Password(Client_Conn(Client)),
- Conf_Server[i].pwd_in) != 0) {
- Log(LOG_ERR,
- "Connection %d: Got bad password from server \"%s\"!",
- Client_Conn(Client), Req->argv[0]);
- Conn_Close(Client_Conn(Client), NULL,
- "Bad password", true);
- return DISCONNECTED;
- }
- /* Is there a registered server with this ID? */
- if (!Client_CheckID(Client, Req->argv[0]))
- return DISCONNECTED;
- /* Mark this connection as belonging to an configured server */
- if (!Conf_SetServer(i, Client_Conn(Client)))
- return DISCONNECTED;
- Client_SetID( Client, Req->argv[0] );
- Client_SetHops( Client, 1 );
- Client_SetInfo( Client, Req->argv[Req->argc - 1] );
- /* Is this server registering on our side, or are we connecting to
- * a remote server? */
- if (Client_Token(Client) != TOKEN_OUTBOUND) {
- /* Incoming connection, send user/pass */
- if (!IRC_WriteStrClient(Client, "PASS %s %s",
- Conf_Server[i].pwd_out,
- NGIRCd_ProtoID)
- || !IRC_WriteStrClient(Client, "SERVER %s 1 :%s",
- Conf_ServerName,
- Conf_ServerInfo)) {
- Conn_Close(Client_Conn(Client),
- "Unexpected server behavior!",
- NULL, false);
- return DISCONNECTED;
- }
- Client_SetIntroducer(Client, Client);
- Client_SetToken(Client, 1);
- } else {
- /* outgoing connect, we already sent a SERVER and PASS
- * command to the peer */
- Client_SetToken(Client, atoi(Req->argv[1]));
- }
- /* Check protocol level */
- if (Client_Type(Client) == CLIENT_GOTPASS) {
- /* We got a "simple" PASS command, so the peer is
- * using the protocol as defined in RFC 1459. */
- if (! (Conn_Options(Client_Conn(Client)) & CONN_RFC1459))
- Log(LOG_INFO,
- "Switching connection %d (\"%s\") to RFC 1459 compatibility mode.",
- Client_Conn(Client), Client_ID(Client));
- Conn_SetOption(Client_Conn(Client), CONN_RFC1459);
- }
- Client_SetType(Client, CLIENT_UNKNOWNSERVER);
- #ifdef ZLIB
- if (Client_HasFlag(Client, 'Z')
- && !Zip_InitConn(Client_Conn(Client))) {
- Conn_Close(Client_Conn(Client),
- "Can't initialize compression (zlib)!",
- NULL, false );
- return DISCONNECTED;
- }
- #endif
- #ifdef IRCPLUS
- if (Client_HasFlag(Client, 'H')) {
- LogDebug("Peer supports IRC+ extended server handshake ...");
- if (!IRC_Send_ISUPPORT(Client))
- return DISCONNECTED;
- return IRC_WriteStrClient(Client, RPL_ENDOFMOTD_MSG,
- Client_ID(Client));
- } else {
- #endif
- if (Conf_MaxNickLength != CLIENT_NICK_LEN_DEFAULT)
- Log(LOG_CRIT,
- "Attention: this server uses a non-standard nick length, but the peer doesn't support the IRC+ extended server handshake!");
- #ifdef IRCPLUS
- }
- #endif
- return IRC_Num_ENDOFMOTD(Client, Req);
- }
- else if( Client_Type( Client ) == CLIENT_SERVER )
- {
- /* New server is being introduced to the network */
- if (Req->argc != 4)
- return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
- Client_ID(Client), Req->command);
- /* check for existing server with same ID */
- if (!Client_CheckID(Client, Req->argv[0]))
- return DISCONNECTED;
- if (!Req->prefix) {
- /* We definitely need a prefix here! */
- Log(LOG_ALERT, "Got SERVER command without prefix! (on connection %d)",
- Client_Conn(Client));
- Conn_Close(Client_Conn(Client), NULL,
- "SERVER command without prefix", true);
- return DISCONNECTED;
- }
- from = Client_Search( Req->prefix );
- if (! from) {
- /* Uh, Server, that introduced the new server is unknown?! */
- Log(LOG_ALERT,
- "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)",
- Req->prefix, Client_Conn(Client));
- Conn_Close(Client_Conn(Client), NULL,
- "Unknown ID in prefix of SERVER", true);
- return DISCONNECTED;
- }
- c = Client_NewRemoteServer(Client, Req->argv[0], from,
- atoi(Req->argv[1]), atoi(Req->argv[2]),
- Req->argv[3], true);
- if (!c) {
- Log(LOG_ALERT,
- "Can't create client structure for server! (on connection %d)",
- Client_Conn(Client));
- Conn_Close(Client_Conn(Client), NULL,
- "Can't allocate client structure for remote server",
- true);
- return DISCONNECTED;
- }
- if (Client_Hops(c) > 1 && Req->prefix[0])
- snprintf(str, sizeof(str), "connected to %s, ",
- Client_ID(from));
- else
- strcpy(str, "");
- Log(LOG_NOTICE|LOG_snotice,
- "Server \"%s\" registered (via %s, %s%d hop%s).",
- Client_ID(c), Client_ID(Client), str, Client_Hops(c),
- Client_Hops(c) > 1 ? "s": "" );
- /* notify other servers */
- IRC_WriteStrServersPrefix(Client, from, "SERVER %s %d %d :%s",
- Client_ID(c), Client_Hops(c) + 1,
- Client_MyToken(c), Client_Info(c));
- return CONNECTED;
- } else
- return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
- Client_ID(Client), Req->command);
- } /* IRC_SERVER */
- /*
- * Handler for the IRC "NJOIN" command.
- *
- * @param Client The client from which this command has been received.
- * @param Req Request structure with prefix and all parameters.
- * @return CONNECTED or DISCONNECTED.
- */
- GLOBAL bool
- IRC_NJOIN( CLIENT *Client, REQUEST *Req )
- {
- char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
- bool is_owner, is_chanadmin, is_op, is_halfop, is_voiced;
- CHANNEL *chan;
- CLIENT *c;
- assert(Client != NULL);
- assert(Req != NULL);
- strlcpy(nick_in, Req->argv[1], sizeof(nick_in));
- strcpy(nick_out, "");
- channame = Req->argv[0];
- ptr = strtok(nick_in, ",");
- while (ptr) {
- is_owner = is_chanadmin = is_op = is_halfop = is_voiced = false;
- /* cut off prefixes */
- while ((*ptr == '~') || (*ptr == '&') || (*ptr == '@') ||
- (*ptr == '%') || (*ptr == '+')) {
- if (*ptr == '~')
- is_owner = true;
- if (*ptr == '&')
- is_chanadmin = true;
- if (*ptr == '@')
- is_op = true;
- if (*ptr == '%')
- is_halfop = true;
- if (*ptr == '+')
- is_voiced = true;
- ptr++;
- }
- c = Client_Search(ptr);
- if (!c) {
- /* Client not found? */
- Log(LOG_ERR,
- "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!",
- ptr, channame);
- goto skip_njoin;
- }
- if (!Channel_Join(c, channame)) {
- /* Failed to join channel. Ooops!? */
- Log(LOG_ALERT,
- "Failed to join client \"%s\" to channel \"%s\" (NJOIN): killing it!",
- ptr, channame);
- IRC_KillClient(NULL, NULL, ptr, "Internal NJOIN error!");
- Log(LOG_DEBUG, "... done.");
- goto skip_njoin;
- }
- chan = Channel_Search(channame);
- assert(chan != NULL);
- if (is_owner)
- Channel_UserModeAdd(chan, c, 'q');
- if (is_chanadmin)
- Channel_UserModeAdd(chan, c, 'a');
- if (is_op)
- Channel_UserModeAdd(chan, c, 'o');
- if (is_halfop)
- Channel_UserModeAdd(chan, c, 'h');
- if (is_voiced)
- Channel_UserModeAdd(chan, c, 'v');
- /* Announce client to the channel */
- IRC_WriteStrChannelPrefix(Client, chan, c, false,
- "JOIN :%s", channame);
- /* Announce "channel user modes" to the channel, if any */
- strlcpy(modes, Channel_UserModes(chan, c), sizeof(modes));
- if (modes[0])
- IRC_WriteStrChannelPrefix(Client, chan, Client, false,
- "MODE %s +%s %s", channame,
- modes, Client_ID(c));
- /* Build nick list for forwarding command */
- if (nick_out[0] != '\0')
- strlcat(nick_out, ",", sizeof(nick_out));
- if (is_owner)
- strlcat(nick_out, "~", sizeof(nick_out));
- if (is_chanadmin)
- strlcat(nick_out, "&", sizeof(nick_out));
- if (is_op)
- strlcat(nick_out, "@", sizeof(nick_out));
- if (is_halfop)
- strlcat(nick_out, "%", sizeof(nick_out));
- if (is_voiced)
- strlcat(nick_out, "+", sizeof(nick_out));
- strlcat(nick_out, ptr, sizeof(nick_out));
- skip_njoin:
- /* Get next nick, if any ... */
- ptr = strtok(NULL, ",");
- }
- /* forward to other servers */
- if (nick_out[0] != '\0')
- IRC_WriteStrServersPrefix(Client, Client_ThisServer(),
- "NJOIN %s :%s", Req->argv[0], nick_out);
- return CONNECTED;
- } /* IRC_NJOIN */
- /**
- * Handler for the IRC "SQUIT" command.
- *
- * @param Client The client from which this command has been received.
- * @param Req Request structure with prefix and all parameters.
- * @return CONNECTED or DISCONNECTED.
- */
- GLOBAL bool
- IRC_SQUIT(CLIENT * Client, REQUEST * Req)
- {
- char msg[COMMAND_LEN], logmsg[COMMAND_LEN];
- CLIENT *from, *target;
- CONN_ID con, client_con;
- int loglevel;
- assert(Client != NULL);
- assert(Req != NULL);
- if (Client_Type(Client) != CLIENT_SERVER
- && !Client_HasMode(Client, 'o'))
- return Op_NoPrivileges(Client, Req);
- if (Client_Type(Client) == CLIENT_SERVER && Req->prefix) {
- from = Client_Search(Req->prefix);
- if (Client_Type(from) != CLIENT_SERVER
- && !Op_Check(Client, Req))
- return Op_NoPrivileges(Client, Req);
- } else
- from = Client;
- if (!from)
- return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
- Client_ID(Client), Req->prefix);
- if (Client_Type(Client) == CLIENT_USER)
- loglevel = LOG_NOTICE | LOG_snotice;
- else
- loglevel = LOG_DEBUG;
- Log(loglevel, "Got SQUIT from %s for \"%s\": \"%s\" ...",
- Client_ID(from), Req->argv[0], Req->argv[1]);
- target = Client_Search(Req->argv[0]);
- if (Client_Type(Client) != CLIENT_SERVER &&
- target == Client_ThisServer())
- return Op_NoPrivileges(Client, Req);
- if (!target) {
- /* The server is (already) unknown */
- Log(LOG_WARNING,
- "Got SQUIT from %s for unknown server \"%s\"!?",
- Client_ID(Client), Req->argv[0]);
- return CONNECTED;
- }
- client_con = Client_Conn(Client);
- con = Client_Conn(target);
- if (Req->argv[1][0])
- if (Client_NextHop(from) != Client || con > NONE)
- snprintf(msg, sizeof(msg), "\"%s\" (SQUIT from %s)",
- Req->argv[1], Client_ID(from));
- else
- strlcpy(msg, Req->argv[1], sizeof(msg));
- else
- snprintf(msg, sizeof(msg), "Got SQUIT from %s",
- Client_ID(from));
- if (con > NONE) {
- /* We are directly connected to the target server, so we
- * have to tear down the connection and to inform all the
- * other remaining servers in the network */
- IRC_SendWallops(Client_ThisServer(), Client_ThisServer(),
- "Received SQUIT %s from %s: %s",
- Req->argv[0], Client_ID(from),
- Req->argv[1][0] ? Req->argv[1] : "-");
- Conn_Close(con, NULL, msg, true);
- if (con == client_con)
- return DISCONNECTED;
- } else {
- /* This server is not directly connected, so the SQUIT must
- * be forwarded ... */
- if (Client_Type(from) != CLIENT_SERVER) {
- /* The origin is not an IRC server, so don't evaluate
- * this SQUIT but simply forward it */
- IRC_WriteStrClientPrefix(Client_NextHop(target),
- from, "SQUIT %s :%s", Req->argv[0], Req->argv[1]);
- } else {
- /* SQUIT has been generated by another server, so
- * remove the target server from the network! */
- logmsg[0] = '\0';
- if (!strchr(msg, '('))
- snprintf(logmsg, sizeof(logmsg),
- "\"%s\" (SQUIT from %s)", Req->argv[1],
- Client_ID(from));
- Client_Destroy(target, logmsg[0] ? logmsg : msg,
- msg, false);
- }
- }
- return CONNECTED;
- } /* IRC_SQUIT */
- /* -eof- */
|