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_WriteErrClient(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_WriteErrClient(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                 /* Make 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 (Client_HasFlag(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 (Client_HasFlag(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)
 187                         return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 188                                                   Client_ID(Client), Req->command);
 189
 190                 /* check for existing server with same ID */
 191                 if (!Client_CheckID(Client, Req->argv[0]))
 192                         return DISCONNECTED;
 193
 194                 from = Client_Search( Req->prefix );
 195                 if (! from) {
 196                         /* Uh, Server, that introduced the new server is unknown?! */
 197                         Log(LOG_ALERT,
 198                             "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)",
 199                             Req->prefix, Client_Conn(Client));
 200                         Conn_Close(Client_Conn(Client), NULL,
 201                                    "Unknown ID in prefix of SERVER", true);
 202                         return DISCONNECTED;
 203                 }
 204
 205                 c = Client_NewRemoteServer(Client, Req->argv[0], from,
 206                                            atoi(Req->argv[1]), atoi(Req->argv[2]),
 207                                            Req->argv[3], true);
 208                 if (!c) {
 209                         Log(LOG_ALERT,
 210                             "Can't create client structure for server! (on connection %d)",
 211                             Client_Conn(Client));
 212                         Conn_Close(Client_Conn(Client), NULL,
 213                                    "Can't allocate client structure for remote server",
 214                                    true);
 215                         return DISCONNECTED;
 216                 }
 217
 218                 if (Client_Hops(c) > 1 && Req->prefix[0])
 219                         snprintf(str, sizeof(str), "connected to %s, ",
 220                                  Client_ID(from));
 221                 else
 222                         strcpy(str, "");
 223                 Log(LOG_NOTICE|LOG_snotice,
 224                     "Server \"%s\" registered (via %s, %s%d hop%s).",
 225                     Client_ID(c), Client_ID(Client), str, Client_Hops(c),
 226                     Client_Hops(c) > 1 ? "s": "" );
 227
 228                 /* notify other servers */
 229                 IRC_WriteStrServersPrefix(Client, from, "SERVER %s %d %d :%s",
 230                                           Client_ID(c), Client_Hops(c) + 1,
 231                                           Client_MyToken(c), Client_Info(c));
 232
 233                 return CONNECTED;
 234         } else
 235                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 236                                           Client_ID(Client), Req->command);
 237 } /* IRC_SERVER */
 238
 239 /*
 240  * Handler for the IRC "NJOIN" command.
 241  *
 242  * @param Client The client from which this command has been received.
 243  * @param Req Request structure with prefix and all parameters.
 244  * @return CONNECTED or DISCONNECTED.
 245  */
 246 GLOBAL bool
 247 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
 248 {
 249         char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
 250         bool is_owner, is_chanadmin, is_op, is_halfop, is_voiced;
 251         CHANNEL *chan;
 252         CLIENT *c;
 253
 254         assert( Client != NULL );
 255         assert( Req != NULL );
 256
 257         _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 2)
 258
 259         strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
 260         strcpy( nick_out, "" );
 261
 262         channame = Req->argv[0];
 263         ptr = strtok( nick_in, "," );
 264         while( ptr )
 265         {
 266                 is_owner = is_chanadmin = is_op = is_halfop = is_voiced = false;
 267
 268                 /* cut off prefixes */
 269                 while(( *ptr == '~') || ( *ptr == '&' ) || ( *ptr == '@' ) ||
 270                         ( *ptr == '%') || ( *ptr == '+' ))
 271                 {
 272                         if( *ptr == '~' ) is_owner = true;
 273                         if( *ptr == '&' ) is_chanadmin = true;
 274                         if( *ptr == '@' ) is_op = true;
 275                         if( *ptr == 'h' ) is_halfop = true;
 276                         if( *ptr == '+' ) is_voiced = true;
 277                         ptr++;
 278                 }
 279
 280                 c = Client_Search( ptr );
 281                 if( c )
 282                 {
 283                         Channel_Join( c, channame );
 284                         chan = Channel_Search( channame );
 285                         assert( chan != NULL );
 286
 287                         if( is_owner ) Channel_UserModeAdd( chan, c, 'q' );
 288                         if( is_chanadmin ) Channel_UserModeAdd( chan, c, 'a' );
 289                         if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
 290                         if( is_halfop ) Channel_UserModeAdd( chan, c, 'h' );
 291                         if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
 292
 293                         /* announce to channel... */
 294                         IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
 295
 296                         /* set Channel-User-Modes */
 297                         strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
 298                         if( modes[0] )
 299                         {
 300                                 /* send modes to channel */
 301                                 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
 302                         }
 303
 304                         if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
 305                         if( is_owner ) strlcat( nick_out, "~", sizeof( nick_out ));
 306                         if( is_chanadmin ) strlcat( nick_out, "&", sizeof( nick_out ));
 307                         if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
 308                         if( is_halfop ) strlcat( nick_out, "%", sizeof( nick_out ));
 309                         if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
 310                         strlcat( nick_out, ptr, sizeof( nick_out ));
 311                 }
 312                 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
 313
 314                 /* search for next Nick */
 315                 ptr = strtok( NULL, "," );
 316         }
 317
 318         /* forward to other servers */
 319         if (nick_out[0] != '\0')
 320                 IRC_WriteStrServersPrefix(Client, Client_ThisServer(),
 321                                           "NJOIN %s :%s", Req->argv[0], nick_out);
 322
 323         return CONNECTED;
 324 } /* IRC_NJOIN */
 325
 326 /**
 327  * Handler for the IRC "SQUIT" command.
 328  *
 329  * @param Client The client from which this command has been received.
 330  * @param Req Request structure with prefix and all parameters.
 331  * @return CONNECTED or DISCONNECTED.
 332  */
 333 GLOBAL bool
 334 IRC_SQUIT(CLIENT * Client, REQUEST * Req)
 335 {
 336         char msg[COMMAND_LEN], logmsg[COMMAND_LEN];
 337         CLIENT *from, *target;
 338         CONN_ID con;
 339         int loglevel;
 340
 341         assert(Client != NULL);
 342         assert(Req != NULL);
 343
 344         if (Client_Type(Client) != CLIENT_SERVER
 345             && !Client_HasMode(Client, 'o'))
 346                 return Op_NoPrivileges(Client, Req);
 347
 348         _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 2)
 349
 350         if (Client_Type(Client) == CLIENT_SERVER && Req->prefix) {
 351                 from = Client_Search(Req->prefix);
 352                 if (Client_Type(from) != CLIENT_SERVER
 353                     && !Op_Check(Client, Req))
 354                         return Op_NoPrivileges(Client, Req);
 355         } else
 356                 from = Client;
 357         if (!from)
 358                 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 359                                           Client_ID(Client), Req->prefix);
 360
 361         if (Client_Type(Client) == CLIENT_USER)
 362                 loglevel = LOG_NOTICE | LOG_snotice;
 363         else
 364                 loglevel = LOG_DEBUG;
 365         Log(loglevel, "Got SQUIT from %s for \"%s\": \"%s\" ...",
 366             Client_ID(from), Req->argv[0], Req->argv[1]);
 367
 368         target = Client_Search(Req->argv[0]);
 369         if (Client_Type(Client) != CLIENT_SERVER &&
 370             target == Client_ThisServer())
 371                 return Op_NoPrivileges(Client, Req);
 372         if (!target) {
 373                 /* The server is (already) unknown */
 374                 Log(LOG_WARNING,
 375                     "Got SQUIT from %s for unknown server \"%s\"!?",
 376                     Client_ID(Client), Req->argv[0]);
 377                 return CONNECTED;
 378         }
 379
 380         con = Client_Conn(target);
 381
 382         if (Req->argv[1][0])
 383                 if (Client_NextHop(from) != Client || con > NONE)
 384                         snprintf(msg, sizeof(msg), "\"%s\" (SQUIT from %s)",
 385                                  Req->argv[1], Client_ID(from));
 386                 else
 387                         strlcpy(msg, Req->argv[1], sizeof(msg));
 388         else
 389                 snprintf(msg, sizeof(msg), "Got SQUIT from %s",
 390                          Client_ID(from));
 391
 392         if (con > NONE) {
 393                 /* We are directly connected to the target server, so we
 394                  * have to tear down the connection and to inform all the
 395                  * other remaining servers in the network */
 396                 IRC_SendWallops(Client_ThisServer(), Client_ThisServer(),
 397                                 "Received SQUIT %s from %s: %s",
 398                                 Req->argv[0], Client_ID(from),
 399                                 Req->argv[1][0] ? Req->argv[1] : "-");
 400                 Conn_Close(con, NULL, msg, true);
 401                 if (con == Client_Conn(Client))
 402                         return DISCONNECTED;
 403         } else {
 404                 /* This server is not directly connected, so the SQUIT must
 405                  * be forwarded ... */
 406                 if (Client_Type(from) != CLIENT_SERVER) {
 407                         /* The origin is not an IRC server, so don't evaluate
 408                          * this SQUIT but simply forward it */
 409                         IRC_WriteStrClientPrefix(Client_NextHop(target),
 410                             from, "SQUIT %s :%s", Req->argv[0], Req->argv[1]);
 411                 } else {
 412                         /* SQUIT has been generated by another server, so
 413                          * remove the target server from the network! */
 414                         logmsg[0] = '\0';
 415                         if (!strchr(msg, '('))
 416                                 snprintf(logmsg, sizeof(logmsg),
 417                                          "\"%s\" (SQUIT from %s)", Req->argv[1],
 418                                          Client_ID(from));
 419                         Client_Destroy(target, logmsg[0] ? logmsg : msg,
 420                                        msg, false);
 421                 }
 422         }
 423         return CONNECTED;
 424 } /* IRC_SQUIT */
 425
 426 /* -eof- */