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
  57         assert( Client != NULL );
  58         assert( Req != NULL );
  59
  60         /* Return an error if this is not a local client */
  61         if (Client_Conn(Client) <= NONE)
  62                 return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
  63                                           Client_ID(Client), Req->command);
  64
  65         if (Client_Type(Client) == CLIENT_GOTPASS ||
  66             Client_Type(Client) == CLIENT_GOTPASS_2813) {
  67                 /* We got a PASS command from the peer, and now a SERVER
  68                  * command: the peer tries to register itself as a server. */
  69                 LogDebug("Connection %d: got SERVER command (new server link) ...",
  70                         Client_Conn(Client));
  71
  72                 if (Req->argc != 2 && Req->argc != 3)
  73                         return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  74                                                   Client_ID(Client),
  75                                                   Req->command);
  76
  77                 /* Get configuration index of new remote server ... */
  78                 for (i = 0; i < MAX_SERVERS; i++)
  79                         if (strcasecmp(Req->argv[0], Conf_Server[i].name) == 0)
  80                                 break;
  81
  82                 /* Makre sure the remote server is configured here */
  83                 if (i >= MAX_SERVERS) {
  84                         Log(LOG_ERR,
  85                             "Connection %d: Server \"%s\" not configured here!",
  86                             Client_Conn(Client), Req->argv[0]);
  87                         Conn_Close(Client_Conn(Client), NULL,
  88                                    "Server not configured here", true);
  89                         return DISCONNECTED;
  90                 }
  91
  92                 /* Check server password */
  93                 if (strcmp(Conn_Password(Client_Conn(Client)),
  94                     Conf_Server[i].pwd_in) != 0) {
  95                         Log(LOG_ERR,
  96                             "Connection %d: Got bad password from server \"%s\"!",
  97                             Client_Conn(Client), Req->argv[0]);
  98                         Conn_Close(Client_Conn(Client), NULL,
  99                                    "Bad password", true);
 100                         return DISCONNECTED;
 101                 }
 102
 103                 /* Is there a registered server with this ID? */
 104                 if (!Client_CheckID(Client, Req->argv[0]))
 105                         return DISCONNECTED;
 106
 107                 Client_SetID( Client, Req->argv[0] );
 108                 Client_SetHops( Client, 1 );
 109                 Client_SetInfo( Client, Req->argv[Req->argc - 1] );
 110
 111                 /* Is this server registering on our side, or are we connecting to
 112                  * a remote server? */
 113                 if (Client_Token(Client) != TOKEN_OUTBOUND) {
 114                         /* Incoming connection, send user/pass */
 115                         if (!IRC_WriteStrClient(Client, "PASS %s %s",
 116                                                 Conf_Server[i].pwd_out,
 117                                                 NGIRCd_ProtoID)
 118                             || !IRC_WriteStrClient(Client, "SERVER %s 1 :%s",
 119                                                    Conf_ServerName,
 120                                                    Conf_ServerInfo)) {
 121                                     Conn_Close(Client_Conn(Client),
 122                                                "Unexpected server behavior!",
 123                                                NULL, false);
 124                                     return DISCONNECTED;
 125                         }
 126                         Client_SetIntroducer(Client, Client);
 127                         Client_SetToken(Client, 1);
 128                 } else {
 129                         /* outgoing connect, we already sent a SERVER and PASS
 130                          * command to the peer */
 131                         Client_SetToken(Client, atoi(Req->argv[1]));
 132                 }
 133
 134                 /* Mark this connection as belonging to an configured server */
 135                 Conf_SetServer(i, Client_Conn(Client));
 136
 137                 /* Check protocol level */
 138                 if (Client_Type(Client) == CLIENT_GOTPASS) {
 139                         /* We got a "simple" PASS command, so the peer is
 140                          * using the protocol as defined in RFC 1459. */
 141                         if (!Conn_Options(Client_Conn(Client)) & CONN_RFC1459)
 142                                 Log(LOG_INFO,
 143                                     "Switching connection %d (\"%s\") to RFC 1459 compatibility mode.",
 144                                     Client_Conn(Client), Client_ID(Client));
 145                         Conn_SetOption(Client_Conn(Client), CONN_RFC1459);
 146                 }
 147
 148                 Client_SetType(Client, CLIENT_UNKNOWNSERVER);
 149
 150 #ifdef ZLIB
 151                 if (strchr(Client_Flags(Client), 'Z')
 152                     && !Zip_InitConn(Client_Conn(Client))) {
 153                         Conn_Close(Client_Conn(Client),
 154                                    "Can't inizialize compression (zlib)!",
 155                                    NULL, false );
 156                         return DISCONNECTED;
 157                 }
 158 #endif
 159
 160 #ifdef IRCPLUS
 161                 if (strchr(Client_Flags(Client), 'H')) {
 162                         LogDebug("Peer supports IRC+ extended server handshake ...");
 163                         if (!IRC_Send_ISUPPORT(Client))
 164                                 return DISCONNECTED;
 165                         return IRC_WriteStrClient(Client, RPL_ENDOFMOTD_MSG,
 166                                                   Client_ID(Client));
 167                 } else {
 168 #endif
 169                         if (Conf_MaxNickLength != CLIENT_NICK_LEN_DEFAULT)
 170                                 Log(LOG_CRIT,
 171                                     "Attention: this server uses a non-standard nick length, but the peer doesn't support the IRC+ extended server handshake!");
 172 #ifdef IRCPLUS
 173                 }
 174 #endif
 175
 176                 return IRC_Num_ENDOFMOTD(Client, Req);
 177         }
 178         else if( Client_Type( Client ) == CLIENT_SERVER )
 179         {
 180                 /* New server is being introduced to the network */
 181
 182                 if( Req->argc != 4 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 183
 184                 /* check for existing server with same ID */
 185                 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
 186
 187                 from = Client_Search( Req->prefix );
 188                 if( ! from )
 189                 {
 190                         /* Uh, Server, that introduced the new server is unknown?! */
 191                         Log( LOG_ALERT, "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)", Req->prefix, Client_Conn( Client ));
 192                         Conn_Close( Client_Conn( Client ), NULL, "Unknown ID in prefix of SERVER", true);
 193                         return DISCONNECTED;
 194                 }
 195
 196                 c = Client_NewRemoteServer(Client, Req->argv[0], from, atoi(Req->argv[1]), atoi(Req->argv[2]), Req->argv[3], true);
 197                 if (!c) {
 198                         Log( LOG_ALERT, "Can't create client structure for server! (on connection %d)", Client_Conn( Client ));
 199                         Conn_Close( Client_Conn( Client ), NULL, "Can't allocate client structure for remote server", true);
 200                         return DISCONNECTED;
 201                 }
 202
 203                 if(( Client_Hops( c ) > 1 ) && ( Req->prefix[0] )) snprintf( str, sizeof( str ), "connected to %s, ", Client_ID( from ));
 204                 else strcpy( str, "" );
 205                 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": "" );
 206
 207                 /* notify other servers */
 208                 IRC_WriteStrServersPrefix( Client, from, "SERVER %s %d %d :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_MyToken( c ), Client_Info( c ));
 209
 210                 return CONNECTED;
 211         } else
 212                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 213                                           Client_ID(Client), Req->command);
 214 } /* IRC_SERVER */
 215
 216
 217 GLOBAL bool
 218 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
 219 {
 220         char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
 221         bool is_owner, is_chanadmin, is_op, is_halfop, is_voiced;
 222         CHANNEL *chan;
 223         CLIENT *c;
 224
 225         assert( Client != NULL );
 226         assert( Req != NULL );
 227
 228         if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 229
 230         strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
 231         strcpy( nick_out, "" );
 232
 233         channame = Req->argv[0];
 234         ptr = strtok( nick_in, "," );
 235         while( ptr )
 236         {
 237                 is_owner = is_chanadmin = is_op = is_halfop = is_voiced = false;
 238
 239                 /* cut off prefixes */
 240                 while(( *ptr == '~') || ( *ptr == '&' ) || ( *ptr == '@' ) ||
 241                         ( *ptr == '%') || ( *ptr == '+' ))
 242                 {
 243                         if( *ptr == '~' ) is_owner = true;
 244                         if( *ptr == '&' ) is_chanadmin = true;
 245                         if( *ptr == '@' ) is_op = true;
 246                         if( *ptr == 'h' ) is_halfop = true;
 247                         if( *ptr == '+' ) is_voiced = true;
 248                         ptr++;
 249                 }
 250
 251                 c = Client_Search( ptr );
 252                 if( c )
 253                 {
 254                         Channel_Join( c, channame );
 255                         chan = Channel_Search( channame );
 256                         assert( chan != NULL );
 257
 258                         if( is_owner ) Channel_UserModeAdd( chan, c, 'q' );
 259                         if( is_chanadmin ) Channel_UserModeAdd( chan, c, 'a' );
 260                         if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
 261                         if( is_halfop ) Channel_UserModeAdd( chan, c, 'h' );
 262                         if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
 263
 264                         /* announce to channel... */
 265                         IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
 266
 267                         /* set Channel-User-Modes */
 268                         strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
 269                         if( modes[0] )
 270                         {
 271                                 /* send modes to channel */
 272                                 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
 273                         }
 274
 275                         if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
 276                         if( is_owner ) strlcat( nick_out, "~", sizeof( nick_out ));
 277                         if( is_chanadmin ) strlcat( nick_out, "&", sizeof( nick_out ));
 278                         if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
 279                         if( is_halfop ) strlcat( nick_out, "%", sizeof( nick_out ));
 280                         if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
 281                         strlcat( nick_out, ptr, sizeof( nick_out ));
 282                 }
 283                 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
 284
 285                 /* search for next Nick */
 286                 ptr = strtok( NULL, "," );
 287         }
 288
 289         /* forward to other servers */
 290         if( nick_out[0] != '\0' ) IRC_WriteStrServersPrefix( Client, Client_ThisServer( ), "NJOIN %s :%s", Req->argv[0], nick_out );
 291
 292         return CONNECTED;
 293 } /* IRC_NJOIN */
 294
 295
 296 /**
 297  * Handler for the IRC command "SQUIT".
 298  * See RFC 2813 section 4.1.2 and RFC 2812 section 3.1.8.
 299  */
 300 GLOBAL bool
 301 IRC_SQUIT(CLIENT * Client, REQUEST * Req)
 302 {
 303         char msg[COMMAND_LEN], logmsg[COMMAND_LEN];
 304         CLIENT *from, *target;
 305         CONN_ID con;
 306         int loglevel;
 307
 308         assert(Client != NULL);
 309         assert(Req != NULL);
 310
 311         if (Client_Type(Client) != CLIENT_SERVER
 312             && !Client_HasMode(Client, 'o'))
 313                 return Op_NoPrivileges(Client, Req);
 314
 315         /* Bad number of arguments? */
 316         if (Req->argc != 2)
 317                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 318                                           Client_ID(Client), Req->command);
 319
 320         if (Client_Type(Client) == CLIENT_SERVER && Req->prefix) {
 321                 from = Client_Search(Req->prefix);
 322                 if (Client_Type(from) != CLIENT_SERVER
 323                     && !Op_Check(Client, Req))
 324                         return Op_NoPrivileges(Client, Req);
 325         } else
 326                 from = Client;
 327         if (!from)
 328                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 329                                           Client_ID(Client), Req->prefix);
 330
 331         if (Client_Type(Client) == CLIENT_USER)
 332                 loglevel = LOG_NOTICE | LOG_snotice;
 333         else
 334                 loglevel = LOG_DEBUG;
 335         Log(loglevel, "Got SQUIT from %s for \"%s\": \"%s\" ...",
 336             Client_ID(from), Req->argv[0], Req->argv[1]);
 337
 338         target = Client_Search(Req->argv[0]);
 339         if (Client_Type(Client) != CLIENT_SERVER &&
 340             target == Client_ThisServer())
 341                 return Op_NoPrivileges(Client, Req);
 342         if (!target) {
 343                 /* The server is (already) unknown */
 344                 Log(LOG_WARNING,
 345                     "Got SQUIT from %s for unknown server \"%s\"!?",
 346                     Client_ID(Client), Req->argv[0]);
 347                 return CONNECTED;
 348         }
 349
 350         con = Client_Conn(target);
 351
 352         if (Req->argv[1][0])
 353                 if (Client_NextHop(from) != Client || con > NONE)
 354                         snprintf(msg, sizeof(msg), "%s (SQUIT from %s)",
 355                                  Req->argv[1], Client_ID(from));
 356                 else
 357                         strlcpy(msg, Req->argv[1], sizeof(msg));
 358         else
 359                 snprintf(msg, sizeof(msg), "Got SQUIT from %s",
 360                          Client_ID(from));
 361
 362         if (con > NONE) {
 363                 /* We are directly connected to the target server, so we
 364                  * have to tear down the connection and to inform all the
 365                  * other remaining servers in the network */
 366                 IRC_SendWallops(Client_ThisServer(), Client_ThisServer(),
 367                                 "Received SQUIT %s from %s: %s",
 368                                 Req->argv[0], Client_ID(from),
 369                                 Req->argv[1][0] ? Req->argv[1] : "-");
 370                 Conn_Close(con, NULL, msg, true);
 371                 if (con == Client_Conn(Client))
 372                         return DISCONNECTED;
 373         } else {
 374                 /* This server is not directly connected, so the SQUIT must
 375                  * be forwarded ... */
 376                 if (Client_Type(from) != CLIENT_SERVER) {
 377                         /* The origin is not an IRC server, so don't evaluate
 378                          * this SQUIT but simply forward it */
 379                         IRC_WriteStrClientPrefix(Client_NextHop(target),
 380                             from, "SQUIT %s :%s", Req->argv[0], Req->argv[1]);
 381                 } else {
 382                         /* SQUIT has been generated by another server, so
 383                          * remove the target server from the network! */
 384                         logmsg[0] = '\0';
 385                         if (!strchr(msg, '('))
 386                                 snprintf(logmsg, sizeof(logmsg),
 387                                          "%s (SQUIT from %s)", Req->argv[1],
 388                                          Client_ID(from));
 389                         Client_Destroy(target, logmsg[0] ? logmsg : msg,
 390                                        msg, false);
 391                 }
 392         }
 393         return CONNECTED;
 394 } /* IRC_SQUIT */
 395
 396 /* -eof- */