src/ngircd/irc-server.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2013 Alexander Barton (alex@barton.de) and Contributors.
   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 "lists.h"
  33 #include "log.h"
  34 #include "messages.h"
  35 #include "parse.h"
  36 #include "numeric.h"
  37 #include "ngircd.h"
  38 #include "irc-info.h"
  39 #include "irc-macros.h"
  40 #include "irc-write.h"
  41 #include "op.h"
  42
  43 #include "exp.h"
  44 #include "irc-server.h"
  45
  46 /**
  47  * Handler for the IRC "SERVER" command.
  48  *
  49  * @param Client The client from which this command has been received.
  50  * @param Req Request structure with prefix and all parameters.
  51  * @return CONNECTED or DISCONNECTED.
  52  */
  53 GLOBAL bool
  54 IRC_SERVER( CLIENT *Client, REQUEST *Req )
  55 {
  56         char str[LINE_LEN];
  57         CLIENT *from, *c;
  58         int i;
  59
  60         assert( Client != NULL );
  61         assert( Req != NULL );
  62
  63         /* Return an error if this is not a local client */
  64         if (Client_Conn(Client) <= NONE)
  65                 return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
  66                                           Client_ID(Client), Req->command);
  67
  68         if (Client_Type(Client) == CLIENT_GOTPASS ||
  69             Client_Type(Client) == CLIENT_GOTPASS_2813) {
  70                 /* We got a PASS command from the peer, and now a SERVER
  71                  * command: the peer tries to register itself as a server. */
  72                 LogDebug("Connection %d: got SERVER command (new server link) ...",
  73                         Client_Conn(Client));
  74
  75                 if (Req->argc != 2 && Req->argc != 3)
  76                         return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  77                                                   Client_ID(Client),
  78                                                   Req->command);
  79
  80                 /* Get configuration index of new remote server ... */
  81                 for (i = 0; i < MAX_SERVERS; i++)
  82                         if (strcasecmp(Req->argv[0], Conf_Server[i].name) == 0)
  83                                 break;
  84
  85                 /* Makre sure the remote server is configured here */
  86                 if (i >= MAX_SERVERS) {
  87                         Log(LOG_ERR,
  88                             "Connection %d: Server \"%s\" not configured here!",
  89                             Client_Conn(Client), Req->argv[0]);
  90                         Conn_Close(Client_Conn(Client), NULL,
  91                                    "Server not configured here", true);
  92                         return DISCONNECTED;
  93                 }
  94
  95                 /* Check server password */
  96                 if (strcmp(Conn_Password(Client_Conn(Client)),
  97                     Conf_Server[i].pwd_in) != 0) {
  98                         Log(LOG_ERR,
  99                             "Connection %d: Got bad password from server \"%s\"!",
 100                             Client_Conn(Client), Req->argv[0]);
 101                         Conn_Close(Client_Conn(Client), NULL,
 102                                    "Bad password", true);
 103                         return DISCONNECTED;
 104                 }
 105
 106                 /* Is there a registered server with this ID? */
 107                 if (!Client_CheckID(Client, Req->argv[0]))
 108                         return DISCONNECTED;
 109
 110                 /* Mark this connection as belonging to an configured server */
 111                 if (!Conf_SetServer(i, Client_Conn(Client)))
 112                         return DISCONNECTED;
 113
 114                 Client_SetID( Client, Req->argv[0] );
 115                 Client_SetHops( Client, 1 );
 116                 Client_SetInfo( Client, Req->argv[Req->argc - 1] );
 117
 118                 /* Is this server registering on our side, or are we connecting to
 119                  * a remote server? */
 120                 if (Client_Token(Client) != TOKEN_OUTBOUND) {
 121                         /* Incoming connection, send user/pass */
 122                         if (!IRC_WriteStrClient(Client, "PASS %s %s",
 123                                                 Conf_Server[i].pwd_out,
 124                                                 NGIRCd_ProtoID)
 125                             || !IRC_WriteStrClient(Client, "SERVER %s 1 :%s",
 126                                                    Conf_ServerName,
 127                                                    Conf_ServerInfo)) {
 128                                     Conn_Close(Client_Conn(Client),
 129                                                "Unexpected server behavior!",
 130                                                NULL, false);
 131                                     return DISCONNECTED;
 132                         }
 133                         Client_SetIntroducer(Client, Client);
 134                         Client_SetToken(Client, 1);
 135                 } else {
 136                         /* outgoing connect, we already sent a SERVER and PASS
 137                          * command to the peer */
 138                         Client_SetToken(Client, atoi(Req->argv[1]));
 139                 }
 140
 141                 /* Check protocol level */
 142                 if (Client_Type(Client) == CLIENT_GOTPASS) {
 143                         /* We got a "simple" PASS command, so the peer is
 144                          * using the protocol as defined in RFC 1459. */
 145                         if (! (Conn_Options(Client_Conn(Client)) & CONN_RFC1459))
 146                                 Log(LOG_INFO,
 147                                     "Switching connection %d (\"%s\") to RFC 1459 compatibility mode.",
 148                                     Client_Conn(Client), Client_ID(Client));
 149                         Conn_SetOption(Client_Conn(Client), CONN_RFC1459);
 150                 }
 151
 152                 Client_SetType(Client, CLIENT_UNKNOWNSERVER);
 153
 154 #ifdef ZLIB
 155                 if (strchr(Client_Flags(Client), 'Z')
 156                     && !Zip_InitConn(Client_Conn(Client))) {
 157                         Conn_Close(Client_Conn(Client),
 158                                    "Can't initialize compression (zlib)!",
 159                                    NULL, false );
 160                         return DISCONNECTED;
 161                 }
 162 #endif
 163
 164 #ifdef IRCPLUS
 165                 if (strchr(Client_Flags(Client), 'H')) {
 166                         LogDebug("Peer supports IRC+ extended server handshake ...");
 167                         if (!IRC_Send_ISUPPORT(Client))
 168                                 return DISCONNECTED;
 169                         return IRC_WriteStrClient(Client, RPL_ENDOFMOTD_MSG,
 170                                                   Client_ID(Client));
 171                 } else {
 172 #endif
 173                         if (Conf_MaxNickLength != CLIENT_NICK_LEN_DEFAULT)
 174                                 Log(LOG_CRIT,
 175                                     "Attention: this server uses a non-standard nick length, but the peer doesn't support the IRC+ extended server handshake!");
 176 #ifdef IRCPLUS
 177                 }
 178 #endif
 179
 180                 return IRC_Num_ENDOFMOTD(Client, Req);
 181         }
 182         else if( Client_Type( Client ) == CLIENT_SERVER )
 183         {
 184                 /* New server is being introduced to the network */
 185
 186                 if( Req->argc != 4 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 187
 188                 /* check for existing server with same ID */
 189                 if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
 190
 191                 from = Client_Search( Req->prefix );
 192                 if( ! from )
 193                 {
 194                         /* Uh, Server, that introduced the new server is unknown?! */
 195                         Log( LOG_ALERT, "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)", Req->prefix, Client_Conn( Client ));
 196                         Conn_Close( Client_Conn( Client ), NULL, "Unknown ID in prefix of SERVER", true);
 197                         return DISCONNECTED;
 198                 }
 199
 200                 c = Client_NewRemoteServer(Client, Req->argv[0], from, atoi(Req->argv[1]), atoi(Req->argv[2]), Req->argv[3], true);
 201                 if (!c) {
 202                         Log( LOG_ALERT, "Can't create client structure for server! (on connection %d)", Client_Conn( Client ));
 203                         Conn_Close( Client_Conn( Client ), NULL, "Can't allocate client structure for remote server", true);
 204                         return DISCONNECTED;
 205                 }
 206
 207                 if(( Client_Hops( c ) > 1 ) && ( Req->prefix[0] )) snprintf( str, sizeof( str ), "connected to %s, ", Client_ID( from ));
 208                 else strcpy( str, "" );
 209                 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": "" );
 210
 211                 /* notify other servers */
 212                 IRC_WriteStrServersPrefix( Client, from, "SERVER %s %d %d :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_MyToken( c ), Client_Info( c ));
 213
 214                 return CONNECTED;
 215         } else
 216                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 217                                           Client_ID(Client), Req->command);
 218 } /* IRC_SERVER */
 219
 220 /*
 221  * Handler for the IRC "NJOIN" command.
 222  *
 223  * @param Client The client from which this command has been received.
 224  * @param Req Request structure with prefix and all parameters.
 225  * @return CONNECTED or DISCONNECTED.
 226  */
 227 GLOBAL bool
 228 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
 229 {
 230         char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
 231         bool is_owner, is_chanadmin, is_op, is_halfop, is_voiced;
 232         CHANNEL *chan;
 233         CLIENT *c;
 234
 235         assert( Client != NULL );
 236         assert( Req != NULL );
 237
 238         _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 2)
 239
 240         strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
 241         strcpy( nick_out, "" );
 242
 243         channame = Req->argv[0];
 244         ptr = strtok( nick_in, "," );
 245         while( ptr )
 246         {
 247                 is_owner = is_chanadmin = is_op = is_halfop = is_voiced = false;
 248
 249                 /* cut off prefixes */
 250                 while(( *ptr == '~') || ( *ptr == '&' ) || ( *ptr == '@' ) ||
 251                         ( *ptr == '%') || ( *ptr == '+' ))
 252                 {
 253                         if( *ptr == '~' ) is_owner = true;
 254                         if( *ptr == '&' ) is_chanadmin = true;
 255                         if( *ptr == '@' ) is_op = true;
 256                         if( *ptr == 'h' ) is_halfop = true;
 257                         if( *ptr == '+' ) is_voiced = true;
 258                         ptr++;
 259                 }
 260
 261                 c = Client_Search( ptr );
 262                 if( c )
 263                 {
 264                         Channel_Join( c, channame );
 265                         chan = Channel_Search( channame );
 266                         assert( chan != NULL );
 267
 268                         if( is_owner ) Channel_UserModeAdd( chan, c, 'q' );
 269                         if( is_chanadmin ) Channel_UserModeAdd( chan, c, 'a' );
 270                         if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
 271                         if( is_halfop ) Channel_UserModeAdd( chan, c, 'h' );
 272                         if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
 273
 274                         /* announce to channel... */
 275                         IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
 276
 277                         /* set Channel-User-Modes */
 278                         strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
 279                         if( modes[0] )
 280                         {
 281                                 /* send modes to channel */
 282                                 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
 283                         }
 284
 285                         if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
 286                         if( is_owner ) strlcat( nick_out, "~", sizeof( nick_out ));
 287                         if( is_chanadmin ) strlcat( nick_out, "&", sizeof( nick_out ));
 288                         if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
 289                         if( is_halfop ) strlcat( nick_out, "%", sizeof( nick_out ));
 290                         if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
 291                         strlcat( nick_out, ptr, sizeof( nick_out ));
 292                 }
 293                 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
 294
 295                 /* search for next Nick */
 296                 ptr = strtok( NULL, "," );
 297         }
 298
 299         /* forward to other servers */
 300         if (nick_out[0] != '\0')
 301                 IRC_WriteStrServersPrefix(Client, Client_ThisServer(),
 302                                           "NJOIN %s :%s", Req->argv[0], nick_out);
 303
 304         return CONNECTED;
 305 } /* IRC_NJOIN */
 306
 307 /**
 308  * Handler for the IRC "SQUIT" command.
 309  *
 310  * @param Client The client from which this command has been received.
 311  * @param Req Request structure with prefix and all parameters.
 312  * @return CONNECTED or DISCONNECTED.
 313  */
 314 GLOBAL bool
 315 IRC_SQUIT(CLIENT * Client, REQUEST * Req)
 316 {
 317         char msg[COMMAND_LEN], logmsg[COMMAND_LEN];
 318         CLIENT *from, *target;
 319         CONN_ID con;
 320         int loglevel;
 321
 322         assert(Client != NULL);
 323         assert(Req != NULL);
 324
 325         if (Client_Type(Client) != CLIENT_SERVER
 326             && !Client_HasMode(Client, 'o'))
 327                 return Op_NoPrivileges(Client, Req);
 328
 329         _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 2)
 330
 331         if (Client_Type(Client) == CLIENT_SERVER && Req->prefix) {
 332                 from = Client_Search(Req->prefix);
 333                 if (Client_Type(from) != CLIENT_SERVER
 334                     && !Op_Check(Client, Req))
 335                         return Op_NoPrivileges(Client, Req);
 336         } else
 337                 from = Client;
 338         if (!from)
 339                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 340                                           Client_ID(Client), Req->prefix);
 341
 342         if (Client_Type(Client) == CLIENT_USER)
 343                 loglevel = LOG_NOTICE | LOG_snotice;
 344         else
 345                 loglevel = LOG_DEBUG;
 346         Log(loglevel, "Got SQUIT from %s for \"%s\": \"%s\" ...",
 347             Client_ID(from), Req->argv[0], Req->argv[1]);
 348
 349         target = Client_Search(Req->argv[0]);
 350         if (Client_Type(Client) != CLIENT_SERVER &&
 351             target == Client_ThisServer())
 352                 return Op_NoPrivileges(Client, Req);
 353         if (!target) {
 354                 /* The server is (already) unknown */
 355                 Log(LOG_WARNING,
 356                     "Got SQUIT from %s for unknown server \"%s\"!?",
 357                     Client_ID(Client), Req->argv[0]);
 358                 return CONNECTED;
 359         }
 360
 361         con = Client_Conn(target);
 362
 363         if (Req->argv[1][0])
 364                 if (Client_NextHop(from) != Client || con > NONE)
 365                         snprintf(msg, sizeof(msg), "\"%s\" (SQUIT from %s)",
 366                                  Req->argv[1], Client_ID(from));
 367                 else
 368                         strlcpy(msg, Req->argv[1], sizeof(msg));
 369         else
 370                 snprintf(msg, sizeof(msg), "Got SQUIT from %s",
 371                          Client_ID(from));
 372
 373         if (con > NONE) {
 374                 /* We are directly connected to the target server, so we
 375                  * have to tear down the connection and to inform all the
 376                  * other remaining servers in the network */
 377                 IRC_SendWallops(Client_ThisServer(), Client_ThisServer(),
 378                                 "Received SQUIT %s from %s: %s",
 379                                 Req->argv[0], Client_ID(from),
 380                                 Req->argv[1][0] ? Req->argv[1] : "-");
 381                 Conn_Close(con, NULL, msg, true);
 382                 if (con == Client_Conn(Client))
 383                         return DISCONNECTED;
 384         } else {
 385                 /* This server is not directly connected, so the SQUIT must
 386                  * be forwarded ... */
 387                 if (Client_Type(from) != CLIENT_SERVER) {
 388                         /* The origin is not an IRC server, so don't evaluate
 389                          * this SQUIT but simply forward it */
 390                         IRC_WriteStrClientPrefix(Client_NextHop(target),
 391                             from, "SQUIT %s :%s", Req->argv[0], Req->argv[1]);
 392                 } else {
 393                         /* SQUIT has been generated by another server, so
 394                          * remove the target server from the network! */
 395                         logmsg[0] = '\0';
 396                         if (!strchr(msg, '('))
 397                                 snprintf(logmsg, sizeof(logmsg),
 398                                          "\"%s\" (SQUIT from %s)", Req->argv[1],
 399                                          Client_ID(from));
 400                         Client_Destroy(target, logmsg[0] ? logmsg : msg,
 401                                        msg, false);
 402                 }
 403         }
 404         return CONNECTED;
 405 } /* IRC_SQUIT */
 406
 407 /* -eof- */