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
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * IRC commands for server links
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <strings.h>
  25
  26 #include "defines.h"
  27 #include "conn.h"
  28 #include "conn-func.h"
  29 #include "conn-zip.h"
  30 #include "conf.h"
  31 #include "channel.h"
  32 #include "irc-write.h"
  33 #include "lists.h"
  34 #include "log.h"
  35 #include "messages.h"
  36 #include "parse.h"
  37 #include "numeric.h"
  38 #include "ngircd.h"
  39 #include "irc-info.h"
  40 #include "op.h"
  41
  42 #include "exp.h"
  43 #include "irc-server.h"
  44
  45
  46 /**
  47  * Handler for the IRC command "SERVER".
  48  * See RFC 2813 section 4.1.2.
  49  */
  50 GLOBAL bool
  51 IRC_SERVER( CLIENT *Client, REQUEST *Req )
  52 {
  53         char str[LINE_LEN];
  54         CLIENT *from, *c;
  55         int i;
  56         CONN_ID con;
  57
  58         assert( Client != NULL );
  59         assert( Req != NULL );
  60
  61         /* Return an error if this is not a local client */
  62         if (Client_Conn(Client) <= NONE)
  63                 return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
  64                                           Client_ID(Client), Req->command);
  65
  66         if (Client_Type(Client) == CLIENT_GOTPASS ||
  67             Client_Type(Client) == CLIENT_GOTPASS_2813) {
  68                 /* We got a PASS command from the peer, and now a SERVER
  69                  * command: the peer tries to register itself as a server. */
  70                 LogDebug("Connection %d: got SERVER command (new server link) ...",
  71                         Client_Conn(Client));
  72
  73                 if(( Req->argc != 2 ) && ( Req->argc != 3 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
  74
  75                 /* Ist this server configured on out side? */
  76                 for( i = 0; i < MAX_SERVERS; i++ ) if( strcasecmp( Req->argv[0], Conf_Server[i].name ) == 0 ) break;
  77                 if( i >= MAX_SERVERS )
  78                 {
  79                         Log( LOG_ERR, "Connection %d: Server \"%s\" not configured here!", Client_Conn( Client ), Req->argv[0] );
  80                         Conn_Close( Client_Conn( Client ), NULL, "Server not configured here", true);
  81                         return DISCONNECTED;
  82                 }
  83                 if( strcmp( Conn_Password( Client_Conn( Client ) ),
  84                             Conf_Server[i].pwd_in ) != 0 )
  85                 {
  86                         /* wrong password */
  87                         Log( LOG_ERR, "Connection %d: Got bad password from server \"%s\"!", Client_Conn( Client ), Req->argv[0] );
  88                         Conn_Close( Client_Conn( Client ), NULL, "Bad password", true);
  89                         return DISCONNECTED;
  90                 }
  91
  92                 /* Is there a registered server with this ID? */
  93                 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
  94
  95                 Client_SetID( Client, Req->argv[0] );
  96                 Client_SetHops( Client, 1 );
  97                 Client_SetInfo( Client, Req->argv[Req->argc - 1] );
  98
  99                 /* Is this server registering on our side, or are we connecting to
 100                  * a remote server? */
 101                 con = Client_Conn(Client);
 102                 if (Client_Token(Client) != TOKEN_OUTBOUND) {
 103                         /* Incoming connection, send user/pass */
 104                         if (!IRC_WriteStrClient(Client, "PASS %s %s",
 105                                                 Conf_Server[i].pwd_out,
 106                                                 NGIRCd_ProtoID)
 107                             || !IRC_WriteStrClient(Client, "SERVER %s 1 :%s",
 108                                                    Conf_ServerName,
 109                                                    Conf_ServerInfo)) {
 110                                     Conn_Close(con, "Unexpected server behavior!",
 111                                                NULL, false);
 112                                     return DISCONNECTED;
 113                         }
 114                         Client_SetIntroducer(Client, Client);
 115                         Client_SetToken(Client, 1);
 116                 } else {
 117                         /* outgoing connect, we already sent a SERVER and PASS
 118                          * command to the peer */
 119                         Client_SetToken(Client, atoi(Req->argv[1]));
 120                 }
 121
 122                 /* Mark this connection as belonging to an configured server */
 123                 Conf_SetServer(i, con);
 124
 125                 /* Check protocol level */
 126                 if (Client_Type(Client) == CLIENT_GOTPASS) {
 127                         /* We got a "simple" PASS command, so the peer is
 128                          * using the protocol as defined in RFC 1459. */
 129                         if (! (Conn_Options(con) & CONN_RFC1459))
 130                                 Log(LOG_INFO,
 131                                     "Switching connection %d (\"%s\") to RFC 1459 compatibility mode.",
 132                                     con, Client_ID(Client));
 133                         Conn_SetOption(con, CONN_RFC1459);
 134                 }
 135
 136                 Client_SetType(Client, CLIENT_UNKNOWNSERVER);
 137
 138 #ifdef ZLIB
 139                 if (strchr(Client_Flags(Client), 'Z') && !Zip_InitConn(con)) {
 140                         Conn_Close( con, "Can't inizialize compression (zlib)!", NULL, false );
 141                         return DISCONNECTED;
 142                 }
 143 #endif
 144
 145 #ifdef IRCPLUS
 146                 if (strchr(Client_Flags(Client), 'H')) {
 147                         LogDebug("Peer supports IRC+ extended server handshake ...");
 148                         if (!IRC_Send_ISUPPORT(Client))
 149                                 return DISCONNECTED;
 150                         return IRC_WriteStrClient(Client, RPL_ENDOFMOTD_MSG,
 151                                                   Client_ID(Client));
 152                 } else {
 153 #endif
 154                         if (Conf_MaxNickLength != CLIENT_NICK_LEN_DEFAULT)
 155                                 Log(LOG_CRIT,
 156                                     "Attention: this server uses a non-standard nick length, but the peer doesn't support the IRC+ extended server handshake!");
 157 #ifdef IRCPLUS
 158                 }
 159 #endif
 160
 161                 return IRC_Num_ENDOFMOTD(Client, Req);
 162         }
 163         else if( Client_Type( Client ) == CLIENT_SERVER )
 164         {
 165                 /* New server is being introduced to the network */
 166
 167                 if( Req->argc != 4 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 168
 169                 /* check for existing server with same ID */
 170                 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
 171
 172                 from = Client_Search( Req->prefix );
 173                 if( ! from )
 174                 {
 175                         /* Uh, Server, that introduced the new server is unknown?! */
 176                         Log( LOG_ALERT, "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)", Req->prefix, Client_Conn( Client ));
 177                         Conn_Close( Client_Conn( Client ), NULL, "Unknown ID in prefix of SERVER", true);
 178                         return DISCONNECTED;
 179                 }
 180
 181                 c = Client_NewRemoteServer(Client, Req->argv[0], from, atoi(Req->argv[1]), atoi(Req->argv[2]), Req->argv[3], true);
 182                 if (!c) {
 183                         Log( LOG_ALERT, "Can't create client structure for server! (on connection %d)", Client_Conn( Client ));
 184                         Conn_Close( Client_Conn( Client ), NULL, "Can't allocate client structure for remote server", true);
 185                         return DISCONNECTED;
 186                 }
 187
 188                 if(( Client_Hops( c ) > 1 ) && ( Req->prefix[0] )) snprintf( str, sizeof( str ), "connected to %s, ", Client_ID( from ));
 189                 else strcpy( str, "" );
 190                 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": "" );
 191
 192                 /* notify other servers */
 193                 IRC_WriteStrServersPrefix( Client, from, "SERVER %s %d %d :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_MyToken( c ), Client_Info( c ));
 194
 195                 return CONNECTED;
 196         } else
 197                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 198                                           Client_ID(Client), Req->command);
 199 } /* IRC_SERVER */
 200
 201
 202 GLOBAL bool
 203 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
 204 {
 205         char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
 206         bool is_op, is_voiced;
 207         CHANNEL *chan;
 208         CLIENT *c;
 209
 210         assert( Client != NULL );
 211         assert( Req != NULL );
 212
 213         if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 214
 215         strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
 216         strcpy( nick_out, "" );
 217
 218         channame = Req->argv[0];
 219         ptr = strtok( nick_in, "," );
 220         while( ptr )
 221         {
 222                 is_op = is_voiced = false;
 223
 224                 /* cut off prefixes */
 225                 while(( *ptr == '@' ) || ( *ptr == '+' ))
 226                 {
 227                         if( *ptr == '@' ) is_op = true;
 228                         if( *ptr == '+' ) is_voiced = true;
 229                         ptr++;
 230                 }
 231
 232                 c = Client_Search( ptr );
 233                 if( c )
 234                 {
 235                         Channel_Join( c, channame );
 236                         chan = Channel_Search( channame );
 237                         assert( chan != NULL );
 238
 239                         if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
 240                         if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
 241
 242                         /* announce to channel... */
 243                         IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
 244
 245                         /* set Channel-User-Modes */
 246                         strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
 247                         if( modes[0] )
 248                         {
 249                                 /* send modes to channel */
 250                                 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
 251                         }
 252
 253                         if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
 254                         if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
 255                         if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
 256                         strlcat( nick_out, ptr, sizeof( nick_out ));
 257                 }
 258                 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
 259
 260                 /* search for next Nick */
 261                 ptr = strtok( NULL, "," );
 262         }
 263
 264         /* forward to other servers */
 265         if( nick_out[0] != '\0' ) IRC_WriteStrServersPrefix( Client, Client_ThisServer( ), "NJOIN %s :%s", Req->argv[0], nick_out );
 266
 267         return CONNECTED;
 268 } /* IRC_NJOIN */
 269
 270
 271 /**
 272  * Handler for the IRC command "SQUIT".
 273  * See RFC 2813 section 4.1.2 and RFC 2812 section 3.1.8.
 274  */
 275 GLOBAL bool
 276 IRC_SQUIT(CLIENT * Client, REQUEST * Req)
 277 {
 278         char msg[COMMAND_LEN], logmsg[COMMAND_LEN];
 279         CLIENT *from, *target;
 280         CONN_ID con;
 281         int loglevel;
 282
 283         assert(Client != NULL);
 284         assert(Req != NULL);
 285
 286         if (Client_Type(Client) != CLIENT_SERVER
 287             && !Client_HasMode(Client, 'o'))
 288                 return Op_NoPrivileges(Client, Req);
 289
 290         /* Bad number of arguments? */
 291         if (Req->argc != 2)
 292                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 293                                           Client_ID(Client), Req->command);
 294
 295         if (Client_Type(Client) == CLIENT_SERVER && Req->prefix) {
 296                 from = Client_Search(Req->prefix);
 297                 if (Client_Type(from) != CLIENT_SERVER
 298                     && !Op_Check(Client, Req))
 299                         return Op_NoPrivileges(Client, Req);
 300         } else
 301                 from = Client;
 302         if (!from)
 303                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 304                                           Client_ID(Client), Req->prefix);
 305
 306         if (Client_Type(Client) == CLIENT_USER)
 307                 loglevel = LOG_NOTICE | LOG_snotice;
 308         else
 309                 loglevel = LOG_DEBUG;
 310         Log(loglevel, "Got SQUIT from %s for \"%s\": \"%s\" ...",
 311             Client_ID(from), Req->argv[0], Req->argv[1]);
 312
 313         target = Client_Search(Req->argv[0]);
 314         if (Client_Type(Client) != CLIENT_SERVER &&
 315             target == Client_ThisServer())
 316                 return Op_NoPrivileges(Client, Req);
 317         if (!target) {
 318                 /* The server is (already) unknown */
 319                 Log(LOG_WARNING,
 320                     "Got SQUIT from %s for unknown server \"%s\"!?",
 321                     Client_ID(Client), Req->argv[0]);
 322                 return CONNECTED;
 323         }
 324
 325         con = Client_Conn(target);
 326
 327         if (Req->argv[1][0])
 328                 if (Client_NextHop(from) != Client || con > NONE)
 329                         snprintf(msg, sizeof(msg), "%s (SQUIT from %s)",
 330                                  Req->argv[1], Client_ID(from));
 331                 else
 332                         strlcpy(msg, Req->argv[1], sizeof(msg));
 333         else
 334                 snprintf(msg, sizeof(msg), "Got SQUIT from %s",
 335                          Client_ID(from));
 336
 337         if (con > NONE) {
 338                 /* We are directly connected to the target server, so we
 339                  * have to tear down the connection and to inform all the
 340                  * other remaining servers in the network */
 341                 IRC_SendWallops(Client_ThisServer(), Client_ThisServer(),
 342                                 "Received SQUIT %s from %s: %s",
 343                                 Req->argv[0], Client_ID(from),
 344                                 Req->argv[1][0] ? Req->argv[1] : "-");
 345                 Conn_Close(con, NULL, msg, true);
 346                 if (con == Client_Conn(Client))
 347                         return DISCONNECTED;
 348         } else {
 349                 /* This server is not directly connected, so the SQUIT must
 350                  * be forwarded ... */
 351                 if (Client_Type(from) != CLIENT_SERVER) {
 352                         /* The origin is not an IRC server, so don't evaluate
 353                          * this SQUIT but simply forward it */
 354                         IRC_WriteStrClientPrefix(Client_NextHop(target),
 355                             from, "SQUIT %s :%s", Req->argv[0], Req->argv[1]);
 356                 } else {
 357                         /* SQUIT has been generated by another server, so
 358                          * remove the target server from the network! */
 359                         logmsg[0] = '\0';
 360                         if (!strchr(msg, '('))
 361                                 snprintf(logmsg, sizeof(logmsg),
 362                                          "%s (SQUIT from %s)", Req->argv[1],
 363                                          Client_ID(from));
 364                         Client_Destroy(target, logmsg[0] ? logmsg : msg,
 365                                        msg, false);
 366                 }
 367         }
 368         return CONNECTED;
 369 } /* IRC_SQUIT */
 370
 371 /* -eof- */