src/ngircd/irc-server.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2007 Alexander Barton (alex@barton.de)
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  *
  11  * IRC commands for server links
  12  */
  13
  14
  15 #include "portab.h"
  16
  17 #include "imp.h"
  18 #include <assert.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <strings.h>
  23
  24 #include "defines.h"
  25 #include "conn.h"
  26 #include "conn-func.h"
  27 #include "conn-zip.h"
  28 #include "conf.h"
  29 #include "channel.h"
  30 #include "irc-write.h"
  31 #include "lists.h"
  32 #include "log.h"
  33 #include "messages.h"
  34 #include "parse.h"
  35 #include "numeric.h"
  36 #include "ngircd.h"
  37 #include "irc-info.h"
  38 #include "op.h"
  39
  40 #include "exp.h"
  41 #include "irc-server.h"
  42
  43
  44 /**
  45  * Handler for the IRC command "SERVER".
  46  * See RFC 2813 section 4.1.2.
  47  */
  48 GLOBAL bool
  49 IRC_SERVER( CLIENT *Client, REQUEST *Req )
  50 {
  51         char str[LINE_LEN];
  52         CLIENT *from, *c;
  53         int i;
  54         CONN_ID con;
  55
  56         assert( Client != NULL );
  57         assert( Req != NULL );
  58
  59         /* Return an error if this is not a local client */
  60         if (Client_Conn(Client) <= NONE)
  61                 return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
  62                                           Client_ID(Client), Req->command);
  63
  64         if (Client_Type(Client) == CLIENT_GOTPASS ||
  65             Client_Type(Client) == CLIENT_GOTPASS_2813) {
  66                 /* We got a PASS command from the peer, and now a SERVER
  67                  * command: the peer tries to register itself as a server. */
  68                 LogDebug("Connection %d: got SERVER command (new server link) ...",
  69                         Client_Conn(Client));
  70
  71                 if(( Req->argc != 2 ) && ( Req->argc != 3 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
  72
  73                 /* Ist this server configured on out side? */
  74                 for( i = 0; i < MAX_SERVERS; i++ ) if( strcasecmp( Req->argv[0], Conf_Server[i].name ) == 0 ) break;
  75                 if( i >= MAX_SERVERS )
  76                 {
  77                         Log( LOG_ERR, "Connection %d: Server \"%s\" not configured here!", Client_Conn( Client ), Req->argv[0] );
  78                         Conn_Close( Client_Conn( Client ), NULL, "Server not configured here", true);
  79                         return DISCONNECTED;
  80                 }
  81                 if( strcmp( Client_Password( Client ), Conf_Server[i].pwd_in ) != 0 )
  82                 {
  83                         /* wrong password */
  84                         Log( LOG_ERR, "Connection %d: Got bad password from server \"%s\"!", Client_Conn( Client ), Req->argv[0] );
  85                         Conn_Close( Client_Conn( Client ), NULL, "Bad password", true);
  86                         return DISCONNECTED;
  87                 }
  88
  89                 /* Is there a registered server with this ID? */
  90                 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
  91
  92                 Client_SetID( Client, Req->argv[0] );
  93                 Client_SetHops( Client, 1 );
  94                 Client_SetInfo( Client, Req->argv[Req->argc - 1] );
  95
  96                 /* Is this server registering on our side, or are we connecting to
  97                  * a remote server? */
  98                 con = Client_Conn(Client);
  99                 if (Client_Token(Client) != TOKEN_OUTBOUND) {
 100                         /* Incoming connection, send user/pass */
 101                         if (!IRC_WriteStrClient(Client, "PASS %s %s",
 102                                                 Conf_Server[i].pwd_out,
 103                                                 NGIRCd_ProtoID)
 104                             || !IRC_WriteStrClient(Client, "SERVER %s 1 :%s",
 105                                                    Conf_ServerName,
 106                                                    Conf_ServerInfo)) {
 107                                     Conn_Close(con, "Unexpected server behavior!",
 108                                                NULL, false);
 109                                     return DISCONNECTED;
 110                         }
 111                         Client_SetIntroducer(Client, Client);
 112                         Client_SetToken(Client, 1);
 113                 } else {
 114                         /* outgoing connect, we already sent a SERVER and PASS
 115                          * command to the peer */
 116                         Client_SetToken(Client, atoi(Req->argv[1]));
 117                 }
 118
 119                 /* Mark this connection as belonging to an configured server */
 120                 Conf_SetServer(i, con);
 121
 122                 /* Check protocol level */
 123                 if (Client_Type(Client) == CLIENT_GOTPASS) {
 124                         /* We got a "simple" PASS command, so the peer is
 125                          * using the protocol as defined in RFC 1459. */
 126                         if (! (Conn_Options(con) & CONN_RFC1459))
 127                                 Log(LOG_INFO,
 128                                     "Switching connection %d (\"%s\") to RFC 1459 compatibility mode.",
 129                                     con, Client_ID(Client));
 130                         Conn_SetOption(con, CONN_RFC1459);
 131                 }
 132
 133                 Client_SetType(Client, CLIENT_UNKNOWNSERVER);
 134
 135 #ifdef ZLIB
 136                 if (strchr(Client_Flags(Client), 'Z') && !Zip_InitConn(con)) {
 137                         Conn_Close( con, "Can't inizialize compression (zlib)!", NULL, false );
 138                         return DISCONNECTED;
 139                 }
 140 #endif
 141
 142 #ifdef IRCPLUS
 143                 if (strchr(Client_Flags(Client), 'H')) {
 144                         LogDebug("Peer supports IRC+ extended server handshake ...");
 145                         if (!IRC_Send_ISUPPORT(Client))
 146                                 return DISCONNECTED;
 147                         return IRC_WriteStrClient(Client, RPL_ENDOFMOTD_MSG,
 148                                                   Client_ID(Client));
 149                 } else {
 150 #endif
 151                         if (Conf_MaxNickLength != CLIENT_NICK_LEN_DEFAULT)
 152                                 Log(LOG_CRIT,
 153                                     "Attention: this server uses a non-standard nick length, but the peer doesn't support the IRC+ extended server handshake!");
 154 #ifdef IRCPLUS
 155                 }
 156 #endif
 157
 158                 return IRC_Num_ENDOFMOTD(Client, Req);
 159         }
 160         else if( Client_Type( Client ) == CLIENT_SERVER )
 161         {
 162                 /* New server is being introduced to the network */
 163
 164                 if( Req->argc != 4 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 165
 166                 /* check for existing server with same ID */
 167                 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
 168
 169                 from = Client_Search( Req->prefix );
 170                 if( ! from )
 171                 {
 172                         /* Uh, Server, that introduced the new server is unknown?! */
 173                         Log( LOG_ALERT, "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)", Req->prefix, Client_Conn( Client ));
 174                         Conn_Close( Client_Conn( Client ), NULL, "Unknown ID in prefix of SERVER", true);
 175                         return DISCONNECTED;
 176                 }
 177
 178                 c = Client_NewRemoteServer(Client, Req->argv[0], from, atoi(Req->argv[1]), atoi(Req->argv[2]), Req->argv[3], true);
 179                 if (!c) {
 180                         Log( LOG_ALERT, "Can't create client structure for server! (on connection %d)", Client_Conn( Client ));
 181                         Conn_Close( Client_Conn( Client ), NULL, "Can't allocate client structure for remote server", true);
 182                         return DISCONNECTED;
 183                 }
 184
 185                 if(( Client_Hops( c ) > 1 ) && ( Req->prefix[0] )) snprintf( str, sizeof( str ), "connected to %s, ", Client_ID( from ));
 186                 else strcpy( str, "" );
 187                 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": "" );
 188
 189                 /* notify other servers */
 190                 IRC_WriteStrServersPrefix( Client, from, "SERVER %s %d %d :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_MyToken( c ), Client_Info( c ));
 191
 192                 return CONNECTED;
 193         } else
 194                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 195                                           Client_ID(Client), Req->command);
 196 } /* IRC_SERVER */
 197
 198
 199 GLOBAL bool
 200 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
 201 {
 202         char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
 203         bool is_op, is_voiced;
 204         CHANNEL *chan;
 205         CLIENT *c;
 206
 207         assert( Client != NULL );
 208         assert( Req != NULL );
 209
 210         if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 211
 212         strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
 213         strcpy( nick_out, "" );
 214
 215         channame = Req->argv[0];
 216         ptr = strtok( nick_in, "," );
 217         while( ptr )
 218         {
 219                 is_op = is_voiced = false;
 220
 221                 /* cut off prefixes */
 222                 while(( *ptr == '@' ) || ( *ptr == '+' ))
 223                 {
 224                         if( *ptr == '@' ) is_op = true;
 225                         if( *ptr == '+' ) is_voiced = true;
 226                         ptr++;
 227                 }
 228
 229                 c = Client_Search( ptr );
 230                 if( c )
 231                 {
 232                         Channel_Join( c, channame );
 233                         chan = Channel_Search( channame );
 234                         assert( chan != NULL );
 235
 236                         if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
 237                         if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
 238
 239                         /* announce to channel... */
 240                         IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
 241
 242                         /* set Channel-User-Modes */
 243                         strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
 244                         if( modes[0] )
 245                         {
 246                                 /* send modes to channel */
 247                                 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
 248                         }
 249
 250                         if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
 251                         if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
 252                         if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
 253                         strlcat( nick_out, ptr, sizeof( nick_out ));
 254                 }
 255                 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
 256
 257                 /* search for next Nick */
 258                 ptr = strtok( NULL, "," );
 259         }
 260
 261         /* forward to other servers */
 262         if( nick_out[0] != '\0' ) IRC_WriteStrServersPrefix( Client, Client_ThisServer( ), "NJOIN %s :%s", Req->argv[0], nick_out );
 263
 264         return CONNECTED;
 265 } /* IRC_NJOIN */
 266
 267
 268 /**
 269  * Handler for the IRC command "SQUIT".
 270  * See RFC 2813 section 4.1.2 and RFC 2812 section 3.1.8.
 271  */
 272 GLOBAL bool
 273 IRC_SQUIT(CLIENT * Client, REQUEST * Req)
 274 {
 275         char msg[COMMAND_LEN], logmsg[COMMAND_LEN];
 276         CLIENT *from, *target;
 277         CONN_ID con;
 278
 279         assert(Client != NULL);
 280         assert(Req != NULL);
 281
 282         if (Client_Type(Client) != CLIENT_SERVER
 283             && !Client_HasMode(Client, 'o'))
 284                 return Op_NoPrivileges(Client, Req);
 285
 286         /* Bad number of arguments? */
 287         if (Req->argc != 2)
 288                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 289                                           Client_ID(Client), Req->command);
 290
 291         if (Client_Type(Client) == CLIENT_SERVER && Req->prefix) {
 292                 from = Client_Search(Req->prefix);
 293                 if (Client_Type(from) != CLIENT_SERVER
 294                     && !Op_Check(Client, Req))
 295                         return Op_NoPrivileges(Client, Req);
 296         } else
 297                 from = Client;
 298         if (!from)
 299                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 300                                           Client_ID(Client), Req->prefix);
 301
 302         Log(LOG_DEBUG, "Got SQUIT from %s for \"%s\": \"%s\" ...",
 303             Client_ID(from), Req->argv[0], Req->argv[1]);
 304
 305         target = Client_Search(Req->argv[0]);
 306         if (Client_Type(Client) != CLIENT_SERVER &&
 307             target == Client_ThisServer())
 308                 return Op_NoPrivileges(Client, Req);
 309         if (!target) {
 310                 /* The server is (already) unknown */
 311                 Log(LOG_WARNING,
 312                     "Got SQUIT from %s for unknown server \"%s\"!?",
 313                     Client_ID(Client), Req->argv[0]);
 314                 return CONNECTED;
 315         }
 316
 317         con = Client_Conn(target);
 318
 319         if (Req->argv[1][0])
 320                 if (Client_NextHop(from) != Client || con > NONE)
 321                         snprintf(msg, sizeof(msg), "%s (SQUIT from %s)",
 322                                  Req->argv[1], Client_ID(from));
 323                 else
 324                         strlcpy(msg, Req->argv[1], sizeof(msg));
 325         else
 326                 snprintf(msg, sizeof(msg), "Got SQUIT from %s",
 327                          Client_ID(from));
 328
 329         if (con > NONE) {
 330                 /* We are directly connected to the target server, so we
 331                  * have to tear down the connection and to inform all the
 332                  * other remaining servers in the network */
 333                 IRC_SendWallops(Client_ThisServer(), Client_ThisServer(),
 334                                 "Received SQUIT %s from %s: %s",
 335                                 Req->argv[0], Client_ID(from),
 336                                 Req->argv[1][0] ? Req->argv[1] : "-");
 337                 Conn_Close(con, NULL, msg, true);
 338                 if (con == Client_Conn(Client))
 339                         return DISCONNECTED;
 340         } else {
 341                 /* This server is not directly connected, so the SQUIT must
 342                  * be forwarded ... */
 343                 if (Client_Type(from) != CLIENT_SERVER) {
 344                         /* The origin is not an IRC server, so don't evaluate
 345                          * this SQUIT but simply forward it */
 346                         IRC_WriteStrClientPrefix(Client_NextHop(target),
 347                             from, "SQUIT %s :%s", Req->argv[0], Req->argv[1]);
 348                 } else {
 349                         /* SQUIT has been generated by another server, so
 350                          * remove the target server from the network! */
 351                         logmsg[0] = '\0';
 352                         if (!strchr(msg, '('))
 353                                 snprintf(logmsg, sizeof(logmsg),
 354                                          "%s (SQUIT from %s)", Req->argv[1],
 355                                          Client_ID(from));
 356                         Client_Destroy(target, logmsg[0] ? logmsg : msg,
 357                                        msg, false);
 358                 }
 359         }
 360         return CONNECTED;
 361 } /* IRC_SQUIT */
 362
 363 /* -eof- */