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 <assert.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <strings.h>
  24
  25 #include "defines.h"
  26 #include "conn.h"
  27 #include "conn-func.h"
  28 #include "conn-zip.h"
  29 #include "conf.h"
  30 #include "channel.h"
  31 #include "lists.h"
  32 #include "log.h"
  33 #include "messages.h"
  34 #include "parse.h"
  35 #include "numeric.h"
  36 #include "ngircd.h"
  37 #include "irc-info.h"
  38 #include "irc-macros.h"
  39 #include "irc-write.h"
  40 #include "op.h"
  41
  42 #include "irc-server.h"
  43
  44 /**
  45  * Handler for the IRC "SERVER" command.
  46  *
  47  * @param Client The client from which this command has been received.
  48  * @param Req Request structure with prefix and all parameters.
  49  * @return CONNECTED or DISCONNECTED.
  50  */
  51 GLOBAL bool
  52 IRC_SERVER( CLIENT *Client, REQUEST *Req )
  53 {
  54         char str[100];
  55         CLIENT *from, *c;
  56         int i;
  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_WriteErrClient(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)
  74                         return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  75                                                   Client_ID(Client),
  76                                                   Req->command);
  77
  78                 /* Get configuration index of new remote server ... */
  79                 for (i = 0; i < MAX_SERVERS; i++)
  80                         if (strcasecmp(Req->argv[0], Conf_Server[i].name) == 0)
  81                                 break;
  82
  83                 /* Make sure the remote server is configured here */
  84                 if (i >= MAX_SERVERS) {
  85                         Log(LOG_ERR,
  86                             "Connection %d: Server \"%s\" not configured here!",
  87                             Client_Conn(Client), Req->argv[0]);
  88                         Conn_Close(Client_Conn(Client), NULL,
  89                                    "Server not configured here", true);
  90                         return DISCONNECTED;
  91                 }
  92
  93                 /* Check server password */
  94                 if (strcmp(Conn_Password(Client_Conn(Client)),
  95                     Conf_Server[i].pwd_in) != 0) {
  96                         Log(LOG_ERR,
  97                             "Connection %d: Got bad password from server \"%s\"!",
  98                             Client_Conn(Client), Req->argv[0]);
  99                         Conn_Close(Client_Conn(Client), NULL,
 100                                    "Bad password", true);
 101                         return DISCONNECTED;
 102                 }
 103
 104                 /* Is there a registered server with this ID? */
 105                 if (!Client_CheckID(Client, Req->argv[0]))
 106                         return DISCONNECTED;
 107
 108                 /* Mark this connection as belonging to an configured server */
 109                 if (!Conf_SetServer(i, Client_Conn(Client)))
 110                         return DISCONNECTED;
 111
 112                 Client_SetID( Client, Req->argv[0] );
 113                 Client_SetHops( Client, 1 );
 114                 Client_SetInfo( Client, Req->argv[Req->argc - 1] );
 115
 116                 /* Is this server registering on our side, or are we connecting to
 117                  * a remote server? */
 118                 if (Client_Token(Client) != TOKEN_OUTBOUND) {
 119                         /* Incoming connection, send user/pass */
 120                         if (!IRC_WriteStrClient(Client, "PASS %s %s",
 121                                                 Conf_Server[i].pwd_out,
 122                                                 NGIRCd_ProtoID)
 123                             || !IRC_WriteStrClient(Client, "SERVER %s 1 :%s",
 124                                                    Conf_ServerName,
 125                                                    Conf_ServerInfo)) {
 126                                     Conn_Close(Client_Conn(Client),
 127                                                "Unexpected server behavior!",
 128                                                NULL, false);
 129                                     return DISCONNECTED;
 130                         }
 131                         Client_SetIntroducer(Client, Client);
 132                         Client_SetToken(Client, 1);
 133                 } else {
 134                         /* outgoing connect, we already sent a SERVER and PASS
 135                          * command to the peer */
 136                         Client_SetToken(Client, atoi(Req->argv[1]));
 137                 }
 138
 139                 /* Check protocol level */
 140                 if (Client_Type(Client) == CLIENT_GOTPASS) {
 141                         /* We got a "simple" PASS command, so the peer is
 142                          * using the protocol as defined in RFC 1459. */
 143                         if (! (Conn_Options(Client_Conn(Client)) & CONN_RFC1459))
 144                                 Log(LOG_INFO,
 145                                     "Switching connection %d (\"%s\") to RFC 1459 compatibility mode.",
 146                                     Client_Conn(Client), Client_ID(Client));
 147                         Conn_SetOption(Client_Conn(Client), CONN_RFC1459);
 148                 }
 149
 150                 Client_SetType(Client, CLIENT_UNKNOWNSERVER);
 151
 152 #ifdef ZLIB
 153                 if (Client_HasFlag(Client, 'Z')
 154                     && !Zip_InitConn(Client_Conn(Client))) {
 155                         Conn_Close(Client_Conn(Client),
 156                                    "Can't initialize compression (zlib)!",
 157                                    NULL, false );
 158                         return DISCONNECTED;
 159                 }
 160 #endif
 161
 162 #ifdef IRCPLUS
 163                 if (Client_HasFlag(Client, 'H')) {
 164                         LogDebug("Peer supports IRC+ extended server handshake ...");
 165                         if (!IRC_Send_ISUPPORT(Client))
 166                                 return DISCONNECTED;
 167                         return IRC_WriteStrClient(Client, RPL_ENDOFMOTD_MSG,
 168                                                   Client_ID(Client));
 169                 } else {
 170 #endif
 171                         if (Conf_MaxNickLength != CLIENT_NICK_LEN_DEFAULT)
 172                                 Log(LOG_CRIT,
 173                                     "Attention: this server uses a non-standard nick length, but the peer doesn't support the IRC+ extended server handshake!");
 174 #ifdef IRCPLUS
 175                 }
 176 #endif
 177
 178                 return IRC_Num_ENDOFMOTD(Client, Req);
 179         }
 180         else if( Client_Type( Client ) == CLIENT_SERVER )
 181         {
 182                 /* New server is being introduced to the network */
 183
 184                 if (Req->argc != 4)
 185                         return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 186                                                   Client_ID(Client), Req->command);
 187
 188                 /* check for existing server with same ID */
 189                 if (!Client_CheckID(Client, Req->argv[0]))
 190                         return DISCONNECTED;
 191
 192                 from = Client_Search( Req->prefix );
 193                 if (! from) {
 194                         /* Uh, Server, that introduced the new server is unknown?! */
 195                         Log(LOG_ALERT,
 196                             "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)",
 197                             Req->prefix, Client_Conn(Client));
 198                         Conn_Close(Client_Conn(Client), NULL,
 199                                    "Unknown ID in prefix of SERVER", true);
 200                         return DISCONNECTED;
 201                 }
 202
 203                 c = Client_NewRemoteServer(Client, Req->argv[0], from,
 204                                            atoi(Req->argv[1]), atoi(Req->argv[2]),
 205                                            Req->argv[3], true);
 206                 if (!c) {
 207                         Log(LOG_ALERT,
 208                             "Can't create client structure for server! (on connection %d)",
 209                             Client_Conn(Client));
 210                         Conn_Close(Client_Conn(Client), NULL,
 211                                    "Can't allocate client structure for remote server",
 212                                    true);
 213                         return DISCONNECTED;
 214                 }
 215
 216                 if (Client_Hops(c) > 1 && Req->prefix[0])
 217                         snprintf(str, sizeof(str), "connected to %s, ",
 218                                  Client_ID(from));
 219                 else
 220                         strcpy(str, "");
 221                 Log(LOG_NOTICE|LOG_snotice,
 222                     "Server \"%s\" registered (via %s, %s%d hop%s).",
 223                     Client_ID(c), Client_ID(Client), str, Client_Hops(c),
 224                     Client_Hops(c) > 1 ? "s": "" );
 225
 226                 /* notify other servers */
 227                 IRC_WriteStrServersPrefix(Client, from, "SERVER %s %d %d :%s",
 228                                           Client_ID(c), Client_Hops(c) + 1,
 229                                           Client_MyToken(c), Client_Info(c));
 230
 231                 return CONNECTED;
 232         } else
 233                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 234                                           Client_ID(Client), Req->command);
 235 } /* IRC_SERVER */
 236
 237 /*
 238  * Handler for the IRC "NJOIN" command.
 239  *
 240  * @param Client The client from which this command has been received.
 241  * @param Req Request structure with prefix and all parameters.
 242  * @return CONNECTED or DISCONNECTED.
 243  */
 244 GLOBAL bool
 245 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
 246 {
 247         char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
 248         bool is_owner, is_chanadmin, is_op, is_halfop, is_voiced;
 249         CHANNEL *chan;
 250         CLIENT *c;
 251
 252         assert( Client != NULL );
 253         assert( Req != NULL );
 254
 255         strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
 256         strcpy( nick_out, "" );
 257
 258         channame = Req->argv[0];
 259         ptr = strtok( nick_in, "," );
 260         while( ptr )
 261         {
 262                 is_owner = is_chanadmin = is_op = is_halfop = is_voiced = false;
 263
 264                 /* cut off prefixes */
 265                 while(( *ptr == '~') || ( *ptr == '&' ) || ( *ptr == '@' ) ||
 266                         ( *ptr == '%') || ( *ptr == '+' ))
 267                 {
 268                         if( *ptr == '~' ) is_owner = true;
 269                         if( *ptr == '&' ) is_chanadmin = true;
 270                         if( *ptr == '@' ) is_op = true;
 271                         if( *ptr == 'h' ) is_halfop = true;
 272                         if( *ptr == '+' ) is_voiced = true;
 273                         ptr++;
 274                 }
 275
 276                 c = Client_Search( ptr );
 277                 if( c )
 278                 {
 279                         Channel_Join( c, channame );
 280                         chan = Channel_Search( channame );
 281                         assert( chan != NULL );
 282
 283                         if( is_owner ) Channel_UserModeAdd( chan, c, 'q' );
 284                         if( is_chanadmin ) Channel_UserModeAdd( chan, c, 'a' );
 285                         if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
 286                         if( is_halfop ) Channel_UserModeAdd( chan, c, 'h' );
 287                         if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
 288
 289                         /* announce to channel... */
 290                         IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
 291
 292                         /* set Channel-User-Modes */
 293                         strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
 294                         if( modes[0] )
 295                         {
 296                                 /* send modes to channel */
 297                                 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
 298                         }
 299
 300                         if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
 301                         if( is_owner ) strlcat( nick_out, "~", sizeof( nick_out ));
 302                         if( is_chanadmin ) strlcat( nick_out, "&", sizeof( nick_out ));
 303                         if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
 304                         if( is_halfop ) strlcat( nick_out, "%", sizeof( nick_out ));
 305                         if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
 306                         strlcat( nick_out, ptr, sizeof( nick_out ));
 307                 }
 308                 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
 309
 310                 /* search for next Nick */
 311                 ptr = strtok( NULL, "," );
 312         }
 313
 314         /* forward to other servers */
 315         if (nick_out[0] != '\0')
 316                 IRC_WriteStrServersPrefix(Client, Client_ThisServer(),
 317                                           "NJOIN %s :%s", Req->argv[0], nick_out);
 318
 319         return CONNECTED;
 320 } /* IRC_NJOIN */
 321
 322 /**
 323  * Handler for the IRC "SQUIT" command.
 324  *
 325  * @param Client The client from which this command has been received.
 326  * @param Req Request structure with prefix and all parameters.
 327  * @return CONNECTED or DISCONNECTED.
 328  */
 329 GLOBAL bool
 330 IRC_SQUIT(CLIENT * Client, REQUEST * Req)
 331 {
 332         char msg[COMMAND_LEN], logmsg[COMMAND_LEN];
 333         CLIENT *from, *target;
 334         CONN_ID con;
 335         int loglevel;
 336
 337         assert(Client != NULL);
 338         assert(Req != NULL);
 339
 340         if (Client_Type(Client) != CLIENT_SERVER
 341             && !Client_HasMode(Client, 'o'))
 342                 return Op_NoPrivileges(Client, Req);
 343
 344         if (Client_Type(Client) == CLIENT_SERVER && Req->prefix) {
 345                 from = Client_Search(Req->prefix);
 346                 if (Client_Type(from) != CLIENT_SERVER
 347                     && !Op_Check(Client, Req))
 348                         return Op_NoPrivileges(Client, Req);
 349         } else
 350                 from = Client;
 351         if (!from)
 352                 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 353                                           Client_ID(Client), Req->prefix);
 354
 355         if (Client_Type(Client) == CLIENT_USER)
 356                 loglevel = LOG_NOTICE | LOG_snotice;
 357         else
 358                 loglevel = LOG_DEBUG;
 359         Log(loglevel, "Got SQUIT from %s for \"%s\": \"%s\" ...",
 360             Client_ID(from), Req->argv[0], Req->argv[1]);
 361
 362         target = Client_Search(Req->argv[0]);
 363         if (Client_Type(Client) != CLIENT_SERVER &&
 364             target == Client_ThisServer())
 365                 return Op_NoPrivileges(Client, Req);
 366         if (!target) {
 367                 /* The server is (already) unknown */
 368                 Log(LOG_WARNING,
 369                     "Got SQUIT from %s for unknown server \"%s\"!?",
 370                     Client_ID(Client), Req->argv[0]);
 371                 return CONNECTED;
 372         }
 373
 374         con = Client_Conn(target);
 375
 376         if (Req->argv[1][0])
 377                 if (Client_NextHop(from) != Client || con > NONE)
 378                         snprintf(msg, sizeof(msg), "\"%s\" (SQUIT from %s)",
 379                                  Req->argv[1], Client_ID(from));
 380                 else
 381                         strlcpy(msg, Req->argv[1], sizeof(msg));
 382         else
 383                 snprintf(msg, sizeof(msg), "Got SQUIT from %s",
 384                          Client_ID(from));
 385
 386         if (con > NONE) {
 387                 /* We are directly connected to the target server, so we
 388                  * have to tear down the connection and to inform all the
 389                  * other remaining servers in the network */
 390                 IRC_SendWallops(Client_ThisServer(), Client_ThisServer(),
 391                                 "Received SQUIT %s from %s: %s",
 392                                 Req->argv[0], Client_ID(from),
 393                                 Req->argv[1][0] ? Req->argv[1] : "-");
 394                 Conn_Close(con, NULL, msg, true);
 395                 if (con == Client_Conn(Client))
 396                         return DISCONNECTED;
 397         } else {
 398                 /* This server is not directly connected, so the SQUIT must
 399                  * be forwarded ... */
 400                 if (Client_Type(from) != CLIENT_SERVER) {
 401                         /* The origin is not an IRC server, so don't evaluate
 402                          * this SQUIT but simply forward it */
 403                         IRC_WriteStrClientPrefix(Client_NextHop(target),
 404                             from, "SQUIT %s :%s", Req->argv[0], Req->argv[1]);
 405                 } else {
 406                         /* SQUIT has been generated by another server, so
 407                          * remove the target server from the network! */
 408                         logmsg[0] = '\0';
 409                         if (!strchr(msg, '('))
 410                                 snprintf(logmsg, sizeof(logmsg),
 411                                          "\"%s\" (SQUIT from %s)", Req->argv[1],
 412                                          Client_ID(from));
 413                         Client_Destroy(target, logmsg[0] ? logmsg : msg,
 414                                        msg, false);
 415                 }
 416         }
 417         return CONNECTED;
 418 } /* IRC_SQUIT */
 419
 420 /* -eof- */