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 "resolve.h"
  26 #include "conn.h"
  27 #include "conn-func.h"
  28 #include "conn-zip.h"
  29 #include "conf.h"
  30 #include "client.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
  41 #include "exp.h"
  42 #include "irc-server.h"
  43
  44
  45 /**
  46  * Handler for the IRC command "SERVER".
  47  * See RFC 2813 section 4.1.2.
  48  */
  49 GLOBAL bool
  50 IRC_SERVER( CLIENT *Client, REQUEST *Req )
  51 {
  52         char str[LINE_LEN], *ptr;
  53         CLIENT *from, *c;
  54         bool ok;
  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( Client_Password( Client ), Conf_Server[i].pwd_in ) != 0 )
  84                 {
  85                         /* wrong password */
  86                         Log( LOG_ERR, "Connection %d: Got bad password from server \"%s\"!", Client_Conn( Client ), Req->argv[0] );
  87                         Conn_Close( Client_Conn( Client ), NULL, "Bad password", true);
  88                         return DISCONNECTED;
  89                 }
  90
  91                 /* Is there a registered server with this ID? */
  92                 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
  93
  94                 Client_SetID( Client, Req->argv[0] );
  95                 Client_SetHops( Client, 1 );
  96                 Client_SetInfo( Client, Req->argv[Req->argc - 1] );
  97
  98                 /* Is this server registering on our side, or are we connecting to
  99                  * a remote server? */
 100                 con = Client_Conn( Client );
 101                 if( Client_Token( Client ) != TOKEN_OUTBOUND )
 102                 {
 103                         /* Incoming connection, send user/pass */
 104                         ok = true;
 105                         if( ! IRC_WriteStrClient( Client, "PASS %s %s", Conf_Server[i].pwd_out, NGIRCd_ProtoID )) ok = false;
 106                         else ok = IRC_WriteStrClient( Client, "SERVER %s 1 :%s", Conf_ServerName, Conf_ServerInfo );
 107                         if( ! ok )
 108                         {
 109                                 Conn_Close( con, "Unexpected server behavior!", NULL, false );
 110                                 return DISCONNECTED;
 111                         }
 112                         Client_SetIntroducer( Client, Client );
 113                         Client_SetToken( Client, 1 );
 114                 }
 115                 else
 116                 {
 117                         /* outgoing connect, we already sent SERVER and PASS to the peer */
 118                         Client_SetToken( Client, atoi( Req->argv[1] ));
 119                 }
 120
 121                 /* Mark this connection as belonging to an configured server */
 122                 Conf_SetServer(i, con);
 123
 124                 /* Check protocol level */
 125                 if (Client_Type(Client) == CLIENT_GOTPASS) {
 126                         /* We got a "simple" PASS command, so the peer is
 127                          * using the protocol as defined in RFC 1459. */
 128                         if (! (Conn_Options(con) & CONN_RFC1459))
 129                                 Log(LOG_INFO,
 130                                     "Switching connection %d (\"%s\") to RFC 1459 compatibility mode.",
 131                                     con, Client_ID(Client));
 132                         Conn_SetOption(con, CONN_RFC1459);
 133                 }
 134
 135                 Client_SetType(Client, CLIENT_UNKNOWNSERVER);
 136
 137 #ifdef ZLIB
 138                 if (strchr(Client_Flags(Client), 'Z') && !Zip_InitConn(con)) {
 139                         Conn_Close( con, "Can't inizialize compression (zlib)!", NULL, false );
 140                         return DISCONNECTED;
 141                 }
 142 #endif
 143
 144 #ifdef IRCPLUS
 145                 if (strchr(Client_Flags(Client), 'H')) {
 146                         LogDebug("Peer supports IRC+ extended server handshake ...");
 147                         if (!IRC_Send_ISUPPORT(Client))
 148                                 return DISCONNECTED;
 149                         return IRC_WriteStrClient(Client, RPL_ENDOFMOTD_MSG,
 150                                                   Client_ID(Client));
 151                 } else {
 152 #endif
 153                         if (Conf_MaxNickLength != CLIENT_NICK_LEN_DEFAULT)
 154                                 Log(LOG_CRIT,
 155                                     "Attention: this server uses a non-standard nick length, but the peer doesn't support the IRC+ extended server handshake!");
 156 #ifdef IRCPLUS
 157                 }
 158 #endif
 159
 160                 return IRC_Num_ENDOFMOTD(Client, Req);
 161         }
 162         else if( Client_Type( Client ) == CLIENT_SERVER )
 163         {
 164                 /* New server is being introduced to the network */
 165
 166                 if( Req->argc != 4 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 167
 168                 /* check for existing server with same ID */
 169                 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
 170
 171                 /* remove superfluous hostnames from Info-Text */
 172                 ptr = strchr( Req->argv[3] + 2, '[' );
 173                 if( ! ptr ) ptr = Req->argv[3];
 174
 175                 from = Client_Search( Req->prefix );
 176                 if( ! from )
 177                 {
 178                         /* Uh, Server, that introduced the new server is unknown?! */
 179                         Log( LOG_ALERT, "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)", Req->prefix, Client_Conn( Client ));
 180                         Conn_Close( Client_Conn( Client ), NULL, "Unknown ID in prefix of SERVER", true);
 181                         return DISCONNECTED;
 182                 }
 183
 184                 c = Client_NewRemoteServer( Client, Req->argv[0], from, atoi( Req->argv[1] ), atoi( Req->argv[2] ), ptr, true);
 185                 if (!c) {
 186                         Log( LOG_ALERT, "Can't create client structure for server! (on connection %d)", Client_Conn( Client ));
 187                         Conn_Close( Client_Conn( Client ), NULL, "Can't allocate client structure for remote server", true);
 188                         return DISCONNECTED;
 189                 }
 190
 191                 if(( Client_Hops( c ) > 1 ) && ( Req->prefix[0] )) snprintf( str, sizeof( str ), "connected to %s, ", Client_ID( from ));
 192                 else strcpy( str, "" );
 193                 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": "" );
 194
 195                 /* notify other servers */
 196                 IRC_WriteStrServersPrefix( Client, from, "SERVER %s %d %d :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_MyToken( c ), Client_Info( c ));
 197
 198                 return CONNECTED;
 199         } else
 200                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 201                                           Client_ID(Client), Req->command);
 202 } /* IRC_SERVER */
 203
 204
 205 GLOBAL bool
 206 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
 207 {
 208         char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
 209         bool is_op, is_voiced;
 210         CHANNEL *chan;
 211         CLIENT *c;
 212
 213         assert( Client != NULL );
 214         assert( Req != NULL );
 215
 216         if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 217
 218         strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
 219         strcpy( nick_out, "" );
 220
 221         channame = Req->argv[0];
 222         ptr = strtok( nick_in, "," );
 223         while( ptr )
 224         {
 225                 is_op = is_voiced = false;
 226
 227                 /* cut off prefixes */
 228                 while(( *ptr == '@' ) || ( *ptr == '+' ))
 229                 {
 230                         if( *ptr == '@' ) is_op = true;
 231                         if( *ptr == '+' ) is_voiced = true;
 232                         ptr++;
 233                 }
 234
 235                 c = Client_Search( ptr );
 236                 if( c )
 237                 {
 238                         Channel_Join( c, channame );
 239                         chan = Channel_Search( channame );
 240                         assert( chan != NULL );
 241
 242                         if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
 243                         if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
 244
 245                         /* announce to channel... */
 246                         IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
 247
 248                         /* set Channel-User-Modes */
 249                         strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
 250                         if( modes[0] )
 251                         {
 252                                 /* send modes to channel */
 253                                 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
 254                         }
 255
 256                         if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
 257                         if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
 258                         if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
 259                         strlcat( nick_out, ptr, sizeof( nick_out ));
 260                 }
 261                 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
 262
 263                 /* search for next Nick */
 264                 ptr = strtok( NULL, "," );
 265         }
 266
 267         /* forward to other servers */
 268         if( nick_out[0] != '\0' ) IRC_WriteStrServersPrefix( Client, Client_ThisServer( ), "NJOIN %s :%s", Req->argv[0], nick_out );
 269
 270         return CONNECTED;
 271 } /* IRC_NJOIN */
 272
 273
 274 GLOBAL bool
 275 IRC_SQUIT( CLIENT *Client, REQUEST *Req )
 276 {
 277         CLIENT *target;
 278         char msg[LINE_LEN + 64];
 279
 280         assert( Client != NULL );
 281         assert( Req != NULL );
 282
 283         if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 284
 285         Log( LOG_DEBUG, "Got SQUIT from %s for \"%s\": \"%s\" ...", Client_ID( Client ), Req->argv[0], Req->argv[1] );
 286
 287         target = Client_Search( Req->argv[0] );
 288         if( ! target )
 289         {
 290                 Log( LOG_WARNING, "Got SQUIT from %s for unknown server \"%s\"!?", Client_ID( Client ), Req->argv[0] );
 291                 return CONNECTED;
 292         }
 293
 294         if( Req->argv[1][0] )
 295         {
 296                 if( strlen( Req->argv[1] ) > LINE_LEN ) Req->argv[1][LINE_LEN] = '\0';
 297                 snprintf( msg, sizeof( msg ), "%s (SQUIT from %s).", Req->argv[1], Client_ID( Client ));
 298         }
 299         else snprintf( msg, sizeof( msg ), "Got SQUIT from %s.", Client_ID( Client ));
 300
 301         if( Client_Conn( target ) > NONE )
 302         {
 303                 /* This server has the connection */
 304                 if( Req->argv[1][0] ) Conn_Close( Client_Conn( target ), msg, Req->argv[1], true);
 305                 else Conn_Close( Client_Conn( target ), msg, NULL, true);
 306                 return DISCONNECTED;
 307         }
 308         else
 309         {
 310                 /* connection was on another server */
 311                 Client_Destroy( target, msg, Req->argv[1], false );
 312                 return CONNECTED;
 313         }
 314 } /* IRC_SQUIT */
 315
 316 /* -eof- */