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[100];
  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                         IRC_SetPenalty(Client, 2);
  77                         return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  78                                                   Client_ID(Client),
  79                                                   Req->command);
  80                 }
  81
  82                 /* Get configuration index of new remote server ... */
  83                 for (i = 0; i < MAX_SERVERS; i++)
  84                         if (strcasecmp(Req->argv[0], Conf_Server[i].name) == 0)
  85                                 break;
  86
  87                 /* Make sure the remote server is configured here */
  88                 if (i >= MAX_SERVERS) {
  89                         Log(LOG_ERR,
  90                             "Connection %d: Server \"%s\" not configured here!",
  91                             Client_Conn(Client), Req->argv[0]);
  92                         Conn_Close(Client_Conn(Client), NULL,
  93                                    "Server not configured here", true);
  94                         return DISCONNECTED;
  95                 }
  96
  97                 /* Check server password */
  98                 if (strcmp(Conn_Password(Client_Conn(Client)),
  99                     Conf_Server[i].pwd_in) != 0) {
 100                         Log(LOG_ERR,
 101                             "Connection %d: Got bad password from server \"%s\"!",
 102                             Client_Conn(Client), Req->argv[0]);
 103                         Conn_Close(Client_Conn(Client), NULL,
 104                                    "Bad password", true);
 105                         return DISCONNECTED;
 106                 }
 107
 108                 /* Is there a registered server with this ID? */
 109                 if (!Client_CheckID(Client, Req->argv[0]))
 110                         return DISCONNECTED;
 111
 112                 /* Mark this connection as belonging to an configured server */
 113                 if (!Conf_SetServer(i, Client_Conn(Client)))
 114                         return DISCONNECTED;
 115
 116                 Client_SetID( Client, Req->argv[0] );
 117                 Client_SetHops( Client, 1 );
 118                 Client_SetInfo( Client, Req->argv[Req->argc - 1] );
 119
 120                 /* Is this server registering on our side, or are we connecting to
 121                  * a remote server? */
 122                 if (Client_Token(Client) != TOKEN_OUTBOUND) {
 123                         /* Incoming connection, send user/pass */
 124                         if (!IRC_WriteStrClient(Client, "PASS %s %s",
 125                                                 Conf_Server[i].pwd_out,
 126                                                 NGIRCd_ProtoID)
 127                             || !IRC_WriteStrClient(Client, "SERVER %s 1 :%s",
 128                                                    Conf_ServerName,
 129                                                    Conf_ServerInfo)) {
 130                                     Conn_Close(Client_Conn(Client),
 131                                                "Unexpected server behavior!",
 132                                                NULL, false);
 133                                     return DISCONNECTED;
 134                         }
 135                         Client_SetIntroducer(Client, Client);
 136                         Client_SetToken(Client, 1);
 137                 } else {
 138                         /* outgoing connect, we already sent a SERVER and PASS
 139                          * command to the peer */
 140                         Client_SetToken(Client, atoi(Req->argv[1]));
 141                 }
 142
 143                 /* Check protocol level */
 144                 if (Client_Type(Client) == CLIENT_GOTPASS) {
 145                         /* We got a "simple" PASS command, so the peer is
 146                          * using the protocol as defined in RFC 1459. */
 147                         if (! (Conn_Options(Client_Conn(Client)) & CONN_RFC1459))
 148                                 Log(LOG_INFO,
 149                                     "Switching connection %d (\"%s\") to RFC 1459 compatibility mode.",
 150                                     Client_Conn(Client), Client_ID(Client));
 151                         Conn_SetOption(Client_Conn(Client), CONN_RFC1459);
 152                 }
 153
 154                 Client_SetType(Client, CLIENT_UNKNOWNSERVER);
 155
 156 #ifdef ZLIB
 157                 if (Client_HasFlag(Client, 'Z')
 158                     && !Zip_InitConn(Client_Conn(Client))) {
 159                         Conn_Close(Client_Conn(Client),
 160                                    "Can't initialize compression (zlib)!",
 161                                    NULL, false );
 162                         return DISCONNECTED;
 163                 }
 164 #endif
 165
 166 #ifdef IRCPLUS
 167                 if (Client_HasFlag(Client, 'H')) {
 168                         LogDebug("Peer supports IRC+ extended server handshake ...");
 169                         if (!IRC_Send_ISUPPORT(Client))
 170                                 return DISCONNECTED;
 171                         return IRC_WriteStrClient(Client, RPL_ENDOFMOTD_MSG,
 172                                                   Client_ID(Client));
 173                 } else {
 174 #endif
 175                         if (Conf_MaxNickLength != CLIENT_NICK_LEN_DEFAULT)
 176                                 Log(LOG_CRIT,
 177                                     "Attention: this server uses a non-standard nick length, but the peer doesn't support the IRC+ extended server handshake!");
 178 #ifdef IRCPLUS
 179                 }
 180 #endif
 181
 182                 return IRC_Num_ENDOFMOTD(Client, Req);
 183         }
 184         else if( Client_Type( Client ) == CLIENT_SERVER )
 185         {
 186                 /* New server is being introduced to the network */
 187
 188                 if (Req->argc != 4) {
 189                         IRC_SetPenalty(Client, 2);
 190                         return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 191                                                   Client_ID(Client), Req->command);
 192                 }
 193
 194                 /* check for existing server with same ID */
 195                 if (!Client_CheckID(Client, Req->argv[0]))
 196                         return DISCONNECTED;
 197
 198                 from = Client_Search( Req->prefix );
 199                 if (! from) {
 200                         /* Uh, Server, that introduced the new server is unknown?! */
 201                         Log(LOG_ALERT,
 202                             "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)",
 203                             Req->prefix, Client_Conn(Client));
 204                         Conn_Close(Client_Conn(Client), NULL,
 205                                    "Unknown ID in prefix of SERVER", true);
 206                         return DISCONNECTED;
 207                 }
 208
 209                 c = Client_NewRemoteServer(Client, Req->argv[0], from,
 210                                            atoi(Req->argv[1]), atoi(Req->argv[2]),
 211                                            Req->argv[3], true);
 212                 if (!c) {
 213                         Log(LOG_ALERT,
 214                             "Can't create client structure for server! (on connection %d)",
 215                             Client_Conn(Client));
 216                         Conn_Close(Client_Conn(Client), NULL,
 217                                    "Can't allocate client structure for remote server",
 218                                    true);
 219                         return DISCONNECTED;
 220                 }
 221
 222                 if (Client_Hops(c) > 1 && Req->prefix[0])
 223                         snprintf(str, sizeof(str), "connected to %s, ",
 224                                  Client_ID(from));
 225                 else
 226                         strcpy(str, "");
 227                 Log(LOG_NOTICE|LOG_snotice,
 228                     "Server \"%s\" registered (via %s, %s%d hop%s).",
 229                     Client_ID(c), Client_ID(Client), str, Client_Hops(c),
 230                     Client_Hops(c) > 1 ? "s": "" );
 231
 232                 /* notify other servers */
 233                 IRC_WriteStrServersPrefix(Client, from, "SERVER %s %d %d :%s",
 234                                           Client_ID(c), Client_Hops(c) + 1,
 235                                           Client_MyToken(c), Client_Info(c));
 236
 237                 return CONNECTED;
 238         } else {
 239                 IRC_SetPenalty(Client, 2);
 240                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 241                                           Client_ID(Client), Req->command);
 242         }
 243 } /* IRC_SERVER */
 244
 245 /*
 246  * Handler for the IRC "NJOIN" command.
 247  *
 248  * @param Client The client from which this command has been received.
 249  * @param Req Request structure with prefix and all parameters.
 250  * @return CONNECTED or DISCONNECTED.
 251  */
 252 GLOBAL bool
 253 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
 254 {
 255         char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
 256         bool is_owner, is_chanadmin, is_op, is_halfop, is_voiced;
 257         CHANNEL *chan;
 258         CLIENT *c;
 259
 260         assert( Client != NULL );
 261         assert( Req != NULL );
 262
 263         strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
 264         strcpy( nick_out, "" );
 265
 266         channame = Req->argv[0];
 267         ptr = strtok( nick_in, "," );
 268         while( ptr )
 269         {
 270                 is_owner = is_chanadmin = is_op = is_halfop = is_voiced = false;
 271
 272                 /* cut off prefixes */
 273                 while(( *ptr == '~') || ( *ptr == '&' ) || ( *ptr == '@' ) ||
 274                         ( *ptr == '%') || ( *ptr == '+' ))
 275                 {
 276                         if( *ptr == '~' ) is_owner = true;
 277                         if( *ptr == '&' ) is_chanadmin = true;
 278                         if( *ptr == '@' ) is_op = true;
 279                         if( *ptr == 'h' ) is_halfop = true;
 280                         if( *ptr == '+' ) is_voiced = true;
 281                         ptr++;
 282                 }
 283
 284                 c = Client_Search( ptr );
 285                 if( c )
 286                 {
 287                         Channel_Join( c, channame );
 288                         chan = Channel_Search( channame );
 289                         assert( chan != NULL );
 290
 291                         if( is_owner ) Channel_UserModeAdd( chan, c, 'q' );
 292                         if( is_chanadmin ) Channel_UserModeAdd( chan, c, 'a' );
 293                         if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
 294                         if( is_halfop ) Channel_UserModeAdd( chan, c, 'h' );
 295                         if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
 296
 297                         /* announce to channel... */
 298                         IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
 299
 300                         /* set Channel-User-Modes */
 301                         strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
 302                         if( modes[0] )
 303                         {
 304                                 /* send modes to channel */
 305                                 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
 306                         }
 307
 308                         if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
 309                         if( is_owner ) strlcat( nick_out, "~", sizeof( nick_out ));
 310                         if( is_chanadmin ) strlcat( nick_out, "&", sizeof( nick_out ));
 311                         if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
 312                         if( is_halfop ) strlcat( nick_out, "%", sizeof( nick_out ));
 313                         if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
 314                         strlcat( nick_out, ptr, sizeof( nick_out ));
 315                 }
 316                 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
 317
 318                 /* search for next Nick */
 319                 ptr = strtok( NULL, "," );
 320         }
 321
 322         /* forward to other servers */
 323         if (nick_out[0] != '\0')
 324                 IRC_WriteStrServersPrefix(Client, Client_ThisServer(),
 325                                           "NJOIN %s :%s", Req->argv[0], nick_out);
 326
 327         return CONNECTED;
 328 } /* IRC_NJOIN */
 329
 330 /**
 331  * Handler for the IRC "SQUIT" command.
 332  *
 333  * @param Client The client from which this command has been received.
 334  * @param Req Request structure with prefix and all parameters.
 335  * @return CONNECTED or DISCONNECTED.
 336  */
 337 GLOBAL bool
 338 IRC_SQUIT(CLIENT * Client, REQUEST * Req)
 339 {
 340         char msg[COMMAND_LEN], logmsg[COMMAND_LEN];
 341         CLIENT *from, *target;
 342         CONN_ID con;
 343         int loglevel;
 344
 345         assert(Client != NULL);
 346         assert(Req != NULL);
 347
 348         if (Client_Type(Client) != CLIENT_SERVER
 349             && !Client_HasMode(Client, 'o'))
 350                 return Op_NoPrivileges(Client, Req);
 351
 352         if (Client_Type(Client) == CLIENT_SERVER && Req->prefix) {
 353                 from = Client_Search(Req->prefix);
 354                 if (Client_Type(from) != CLIENT_SERVER
 355                     && !Op_Check(Client, Req))
 356                         return Op_NoPrivileges(Client, Req);
 357         } else
 358                 from = Client;
 359         if (!from)
 360                 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 361                                           Client_ID(Client), Req->prefix);
 362
 363         if (Client_Type(Client) == CLIENT_USER)
 364                 loglevel = LOG_NOTICE | LOG_snotice;
 365         else
 366                 loglevel = LOG_DEBUG;
 367         Log(loglevel, "Got SQUIT from %s for \"%s\": \"%s\" ...",
 368             Client_ID(from), Req->argv[0], Req->argv[1]);
 369
 370         target = Client_Search(Req->argv[0]);
 371         if (Client_Type(Client) != CLIENT_SERVER &&
 372             target == Client_ThisServer())
 373                 return Op_NoPrivileges(Client, Req);
 374         if (!target) {
 375                 /* The server is (already) unknown */
 376                 Log(LOG_WARNING,
 377                     "Got SQUIT from %s for unknown server \"%s\"!?",
 378                     Client_ID(Client), Req->argv[0]);
 379                 return CONNECTED;
 380         }
 381
 382         con = Client_Conn(target);
 383
 384         if (Req->argv[1][0])
 385                 if (Client_NextHop(from) != Client || con > NONE)
 386                         snprintf(msg, sizeof(msg), "\"%s\" (SQUIT from %s)",
 387                                  Req->argv[1], Client_ID(from));
 388                 else
 389                         strlcpy(msg, Req->argv[1], sizeof(msg));
 390         else
 391                 snprintf(msg, sizeof(msg), "Got SQUIT from %s",
 392                          Client_ID(from));
 393
 394         if (con > NONE) {
 395                 /* We are directly connected to the target server, so we
 396                  * have to tear down the connection and to inform all the
 397                  * other remaining servers in the network */
 398                 IRC_SendWallops(Client_ThisServer(), Client_ThisServer(),
 399                                 "Received SQUIT %s from %s: %s",
 400                                 Req->argv[0], Client_ID(from),
 401                                 Req->argv[1][0] ? Req->argv[1] : "-");
 402                 Conn_Close(con, NULL, msg, true);
 403                 if (con == Client_Conn(Client))
 404                         return DISCONNECTED;
 405         } else {
 406                 /* This server is not directly connected, so the SQUIT must
 407                  * be forwarded ... */
 408                 if (Client_Type(from) != CLIENT_SERVER) {
 409                         /* The origin is not an IRC server, so don't evaluate
 410                          * this SQUIT but simply forward it */
 411                         IRC_WriteStrClientPrefix(Client_NextHop(target),
 412                             from, "SQUIT %s :%s", Req->argv[0], Req->argv[1]);
 413                 } else {
 414                         /* SQUIT has been generated by another server, so
 415                          * remove the target server from the network! */
 416                         logmsg[0] = '\0';
 417                         if (!strchr(msg, '('))
 418                                 snprintf(logmsg, sizeof(logmsg),
 419                                          "\"%s\" (SQUIT from %s)", Req->argv[1],
 420                                          Client_ID(from));
 421                         Client_Destroy(target, logmsg[0] ? logmsg : msg,
 422                                        msg, false);
 423                 }
 424         }
 425         return CONNECTED;
 426 } /* IRC_SQUIT */
 427
 428 /* -eof- */