src/ngircd/irc-server.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2014 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 "conn-func.h"
  26 #include "conn-zip.h"
  27 #include "conf.h"
  28 #include "channel.h"
  29 #include "log.h"
  30 #include "messages.h"
  31 #include "parse.h"
  32 #include "numeric.h"
  33 #include "ngircd.h"
  34 #include "irc-info.h"
  35 #include "irc-write.h"
  36 #include "op.h"
  37
  38 /**
  39  * Handler for the IRC "SERVER" command.
  40  *
  41  * @param Client The client from which this command has been received.
  42  * @param Req Request structure with prefix and all parameters.
  43  * @return CONNECTED or DISCONNECTED.
  44  */
  45 GLOBAL bool
  46 IRC_SERVER( CLIENT *Client, REQUEST *Req )
  47 {
  48         char str[100];
  49         CLIENT *from, *c;
  50         int i;
  51
  52         assert( Client != NULL );
  53         assert( Req != NULL );
  54
  55         /* Return an error if this is not a local client */
  56         if (Client_Conn(Client) <= NONE)
  57                 return IRC_WriteErrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
  58                                           Client_ID(Client), Req->command);
  59
  60         if (Client_Type(Client) == CLIENT_GOTPASS ||
  61             Client_Type(Client) == CLIENT_GOTPASS_2813) {
  62                 /* We got a PASS command from the peer, and now a SERVER
  63                  * command: the peer tries to register itself as a server. */
  64                 LogDebug("Connection %d: got SERVER command (new server link) ...",
  65                         Client_Conn(Client));
  66
  67                 if (Req->argc != 2 && Req->argc != 3)
  68                         return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  69                                                   Client_ID(Client),
  70                                                   Req->command);
  71
  72                 /* Get configuration index of new remote server ... */
  73                 for (i = 0; i < MAX_SERVERS; i++)
  74                         if (strcasecmp(Req->argv[0], Conf_Server[i].name) == 0)
  75                                 break;
  76
  77                 /* Make sure the remote server is configured here */
  78                 if (i >= MAX_SERVERS) {
  79                         Log(LOG_ERR,
  80                             "Connection %d: Server \"%s\" not configured here!",
  81                             Client_Conn(Client), Req->argv[0]);
  82                         Conn_Close(Client_Conn(Client), NULL,
  83                                    "Server not configured here", true);
  84                         return DISCONNECTED;
  85                 }
  86
  87                 /* Check server password */
  88                 if (strcmp(Conn_Password(Client_Conn(Client)),
  89                     Conf_Server[i].pwd_in) != 0) {
  90                         Log(LOG_ERR,
  91                             "Connection %d: Got bad password from server \"%s\"!",
  92                             Client_Conn(Client), Req->argv[0]);
  93                         Conn_Close(Client_Conn(Client), NULL,
  94                                    "Bad password", true);
  95                         return DISCONNECTED;
  96                 }
  97
  98                 /* Is there a registered server with this ID? */
  99                 if (!Client_CheckID(Client, Req->argv[0]))
 100                         return DISCONNECTED;
 101
 102                 /* Mark this connection as belonging to an configured server */
 103                 if (!Conf_SetServer(i, Client_Conn(Client)))
 104                         return DISCONNECTED;
 105
 106                 Client_SetID( Client, Req->argv[0] );
 107                 Client_SetHops( Client, 1 );
 108                 Client_SetInfo( Client, Req->argv[Req->argc - 1] );
 109
 110                 /* Is this server registering on our side, or are we connecting to
 111                  * a remote server? */
 112                 if (Client_Token(Client) != TOKEN_OUTBOUND) {
 113                         /* Incoming connection, send user/pass */
 114                         if (!IRC_WriteStrClient(Client, "PASS %s %s",
 115                                                 Conf_Server[i].pwd_out,
 116                                                 NGIRCd_ProtoID)
 117                             || !IRC_WriteStrClient(Client, "SERVER %s 1 :%s",
 118                                                    Conf_ServerName,
 119                                                    Conf_ServerInfo)) {
 120                                     Conn_Close(Client_Conn(Client),
 121                                                "Unexpected server behavior!",
 122                                                NULL, false);
 123                                     return DISCONNECTED;
 124                         }
 125                         Client_SetIntroducer(Client, Client);
 126                         Client_SetToken(Client, 1);
 127                 } else {
 128                         /* outgoing connect, we already sent a SERVER and PASS
 129                          * command to the peer */
 130                         Client_SetToken(Client, atoi(Req->argv[1]));
 131                 }
 132
 133                 /* Check protocol level */
 134                 if (Client_Type(Client) == CLIENT_GOTPASS) {
 135                         /* We got a "simple" PASS command, so the peer is
 136                          * using the protocol as defined in RFC 1459. */
 137                         if (! (Conn_Options(Client_Conn(Client)) & CONN_RFC1459))
 138                                 Log(LOG_INFO,
 139                                     "Switching connection %d (\"%s\") to RFC 1459 compatibility mode.",
 140                                     Client_Conn(Client), Client_ID(Client));
 141                         Conn_SetOption(Client_Conn(Client), CONN_RFC1459);
 142                 }
 143
 144                 Client_SetType(Client, CLIENT_UNKNOWNSERVER);
 145
 146 #ifdef ZLIB
 147                 if (Client_HasFlag(Client, 'Z')
 148                     && !Zip_InitConn(Client_Conn(Client))) {
 149                         Conn_Close(Client_Conn(Client),
 150                                    "Can't initialize compression (zlib)!",
 151                                    NULL, false );
 152                         return DISCONNECTED;
 153                 }
 154 #endif
 155
 156 #ifdef IRCPLUS
 157                 if (Client_HasFlag(Client, 'H')) {
 158                         LogDebug("Peer supports IRC+ extended server handshake ...");
 159                         if (!IRC_Send_ISUPPORT(Client))
 160                                 return DISCONNECTED;
 161                         return IRC_WriteStrClient(Client, RPL_ENDOFMOTD_MSG,
 162                                                   Client_ID(Client));
 163                 } else {
 164 #endif
 165                         if (Conf_MaxNickLength != CLIENT_NICK_LEN_DEFAULT)
 166                                 Log(LOG_CRIT,
 167                                     "Attention: this server uses a non-standard nick length, but the peer doesn't support the IRC+ extended server handshake!");
 168 #ifdef IRCPLUS
 169                 }
 170 #endif
 171
 172                 return IRC_Num_ENDOFMOTD(Client, Req);
 173         }
 174         else if( Client_Type( Client ) == CLIENT_SERVER )
 175         {
 176                 /* New server is being introduced to the network */
 177
 178                 if (Req->argc != 4)
 179                         return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 180                                                   Client_ID(Client), Req->command);
 181
 182                 /* check for existing server with same ID */
 183                 if (!Client_CheckID(Client, Req->argv[0]))
 184                         return DISCONNECTED;
 185
 186                 from = Client_Search( Req->prefix );
 187                 if (! from) {
 188                         /* Uh, Server, that introduced the new server is unknown?! */
 189                         Log(LOG_ALERT,
 190                             "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)",
 191                             Req->prefix, Client_Conn(Client));
 192                         Conn_Close(Client_Conn(Client), NULL,
 193                                    "Unknown ID in prefix of SERVER", true);
 194                         return DISCONNECTED;
 195                 }
 196
 197                 c = Client_NewRemoteServer(Client, Req->argv[0], from,
 198                                            atoi(Req->argv[1]), atoi(Req->argv[2]),
 199                                            Req->argv[3], true);
 200                 if (!c) {
 201                         Log(LOG_ALERT,
 202                             "Can't create client structure for server! (on connection %d)",
 203                             Client_Conn(Client));
 204                         Conn_Close(Client_Conn(Client), NULL,
 205                                    "Can't allocate client structure for remote server",
 206                                    true);
 207                         return DISCONNECTED;
 208                 }
 209
 210                 if (Client_Hops(c) > 1 && Req->prefix[0])
 211                         snprintf(str, sizeof(str), "connected to %s, ",
 212                                  Client_ID(from));
 213                 else
 214                         strcpy(str, "");
 215                 Log(LOG_NOTICE|LOG_snotice,
 216                     "Server \"%s\" registered (via %s, %s%d hop%s).",
 217                     Client_ID(c), Client_ID(Client), str, Client_Hops(c),
 218                     Client_Hops(c) > 1 ? "s": "" );
 219
 220                 /* notify other servers */
 221                 IRC_WriteStrServersPrefix(Client, from, "SERVER %s %d %d :%s",
 222                                           Client_ID(c), Client_Hops(c) + 1,
 223                                           Client_MyToken(c), Client_Info(c));
 224
 225                 return CONNECTED;
 226         } else
 227                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 228                                           Client_ID(Client), Req->command);
 229 } /* IRC_SERVER */
 230
 231 /*
 232  * Handler for the IRC "NJOIN" command.
 233  *
 234  * @param Client The client from which this command has been received.
 235  * @param Req Request structure with prefix and all parameters.
 236  * @return CONNECTED or DISCONNECTED.
 237  */
 238 GLOBAL bool
 239 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
 240 {
 241         char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
 242         bool is_owner, is_chanadmin, is_op, is_halfop, is_voiced;
 243         CHANNEL *chan;
 244         CLIENT *c;
 245
 246         assert( Client != NULL );
 247         assert( Req != NULL );
 248
 249         strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
 250         strcpy( nick_out, "" );
 251
 252         channame = Req->argv[0];
 253         ptr = strtok( nick_in, "," );
 254         while( ptr )
 255         {
 256                 is_owner = is_chanadmin = is_op = is_halfop = is_voiced = false;
 257
 258                 /* cut off prefixes */
 259                 while(( *ptr == '~') || ( *ptr == '&' ) || ( *ptr == '@' ) ||
 260                         ( *ptr == '%') || ( *ptr == '+' ))
 261                 {
 262                         if( *ptr == '~' ) is_owner = true;
 263                         if( *ptr == '&' ) is_chanadmin = true;
 264                         if( *ptr == '@' ) is_op = true;
 265                         if( *ptr == 'h' ) is_halfop = true;
 266                         if( *ptr == '+' ) is_voiced = true;
 267                         ptr++;
 268                 }
 269
 270                 c = Client_Search( ptr );
 271                 if( c )
 272                 {
 273                         Channel_Join( c, channame );
 274                         chan = Channel_Search( channame );
 275                         assert( chan != NULL );
 276
 277                         if( is_owner ) Channel_UserModeAdd( chan, c, 'q' );
 278                         if( is_chanadmin ) Channel_UserModeAdd( chan, c, 'a' );
 279                         if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
 280                         if( is_halfop ) Channel_UserModeAdd( chan, c, 'h' );
 281                         if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
 282
 283                         /* announce to channel... */
 284                         IRC_WriteStrChannelPrefix( Client, chan, c, false, "JOIN :%s", channame );
 285
 286                         /* set Channel-User-Modes */
 287                         strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
 288                         if( modes[0] )
 289                         {
 290                                 /* send modes to channel */
 291                                 IRC_WriteStrChannelPrefix( Client, chan, Client, false, "MODE %s +%s %s", channame, modes, Client_ID( c ));
 292                         }
 293
 294                         if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
 295                         if( is_owner ) strlcat( nick_out, "~", sizeof( nick_out ));
 296                         if( is_chanadmin ) strlcat( nick_out, "&", sizeof( nick_out ));
 297                         if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
 298                         if( is_halfop ) strlcat( nick_out, "%", sizeof( nick_out ));
 299                         if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
 300                         strlcat( nick_out, ptr, sizeof( nick_out ));
 301                 }
 302                 else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
 303
 304                 /* search for next Nick */
 305                 ptr = strtok( NULL, "," );
 306         }
 307
 308         /* forward to other servers */
 309         if (nick_out[0] != '\0')
 310                 IRC_WriteStrServersPrefix(Client, Client_ThisServer(),
 311                                           "NJOIN %s :%s", Req->argv[0], nick_out);
 312
 313         return CONNECTED;
 314 } /* IRC_NJOIN */
 315
 316 /**
 317  * Handler for the IRC "SQUIT" command.
 318  *
 319  * @param Client The client from which this command has been received.
 320  * @param Req Request structure with prefix and all parameters.
 321  * @return CONNECTED or DISCONNECTED.
 322  */
 323 GLOBAL bool
 324 IRC_SQUIT(CLIENT * Client, REQUEST * Req)
 325 {
 326         char msg[COMMAND_LEN], logmsg[COMMAND_LEN];
 327         CLIENT *from, *target;
 328         CONN_ID con;
 329         int loglevel;
 330
 331         assert(Client != NULL);
 332         assert(Req != NULL);
 333
 334         if (Client_Type(Client) != CLIENT_SERVER
 335             && !Client_HasMode(Client, 'o'))
 336                 return Op_NoPrivileges(Client, Req);
 337
 338         if (Client_Type(Client) == CLIENT_SERVER && Req->prefix) {
 339                 from = Client_Search(Req->prefix);
 340                 if (Client_Type(from) != CLIENT_SERVER
 341                     && !Op_Check(Client, Req))
 342                         return Op_NoPrivileges(Client, Req);
 343         } else
 344                 from = Client;
 345         if (!from)
 346                 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 347                                           Client_ID(Client), Req->prefix);
 348
 349         if (Client_Type(Client) == CLIENT_USER)
 350                 loglevel = LOG_NOTICE | LOG_snotice;
 351         else
 352                 loglevel = LOG_DEBUG;
 353         Log(loglevel, "Got SQUIT from %s for \"%s\": \"%s\" ...",
 354             Client_ID(from), Req->argv[0], Req->argv[1]);
 355
 356         target = Client_Search(Req->argv[0]);
 357         if (Client_Type(Client) != CLIENT_SERVER &&
 358             target == Client_ThisServer())
 359                 return Op_NoPrivileges(Client, Req);
 360         if (!target) {
 361                 /* The server is (already) unknown */
 362                 Log(LOG_WARNING,
 363                     "Got SQUIT from %s for unknown server \"%s\"!?",
 364                     Client_ID(Client), Req->argv[0]);
 365                 return CONNECTED;
 366         }
 367
 368         con = Client_Conn(target);
 369
 370         if (Req->argv[1][0])
 371                 if (Client_NextHop(from) != Client || con > NONE)
 372                         snprintf(msg, sizeof(msg), "\"%s\" (SQUIT from %s)",
 373                                  Req->argv[1], Client_ID(from));
 374                 else
 375                         strlcpy(msg, Req->argv[1], sizeof(msg));
 376         else
 377                 snprintf(msg, sizeof(msg), "Got SQUIT from %s",
 378                          Client_ID(from));
 379
 380         if (con > NONE) {
 381                 /* We are directly connected to the target server, so we
 382                  * have to tear down the connection and to inform all the
 383                  * other remaining servers in the network */
 384                 IRC_SendWallops(Client_ThisServer(), Client_ThisServer(),
 385                                 "Received SQUIT %s from %s: %s",
 386                                 Req->argv[0], Client_ID(from),
 387                                 Req->argv[1][0] ? Req->argv[1] : "-");
 388                 Conn_Close(con, NULL, msg, true);
 389                 if (con == Client_Conn(Client))
 390                         return DISCONNECTED;
 391         } else {
 392                 /* This server is not directly connected, so the SQUIT must
 393                  * be forwarded ... */
 394                 if (Client_Type(from) != CLIENT_SERVER) {
 395                         /* The origin is not an IRC server, so don't evaluate
 396                          * this SQUIT but simply forward it */
 397                         IRC_WriteStrClientPrefix(Client_NextHop(target),
 398                             from, "SQUIT %s :%s", Req->argv[0], Req->argv[1]);
 399                 } else {
 400                         /* SQUIT has been generated by another server, so
 401                          * remove the target server from the network! */
 402                         logmsg[0] = '\0';
 403                         if (!strchr(msg, '('))
 404                                 snprintf(logmsg, sizeof(logmsg),
 405                                          "\"%s\" (SQUIT from %s)", Req->argv[1],
 406                                          Client_ID(from));
 407                         Client_Destroy(target, logmsg[0] ? logmsg : msg,
 408                                        msg, false);
 409                 }
 410         }
 411         return CONNECTED;
 412 } /* IRC_SQUIT */
 413
 414 /* -eof- */