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.h"
  35 #include "irc-info.h"
  36 #include "irc-write.h"
  37 #include "op.h"
  38
  39 #include "irc-server.h"
  40
  41 /**
  42  * Handler for the IRC "SERVER" command.
  43  *
  44  * @param Client The client from which this command has been received.
  45  * @param Req Request structure with prefix and all parameters.
  46  * @return CONNECTED or DISCONNECTED.
  47  */
  48 GLOBAL bool
  49 IRC_SERVER( CLIENT *Client, REQUEST *Req )
  50 {
  51         char str[100];
  52         CLIENT *from, *c;
  53         int i;
  54
  55         assert( Client != NULL );
  56         assert( Req != NULL );
  57
  58         /* Return an error if this is not a local client */
  59         if (Client_Conn(Client) <= NONE)
  60                 return IRC_WriteErrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
  61                                           Client_ID(Client), Req->command);
  62
  63         if (Client_Type(Client) == CLIENT_GOTPASS ||
  64             Client_Type(Client) == CLIENT_GOTPASS_2813) {
  65                 /* We got a PASS command from the peer, and now a SERVER
  66                  * command: the peer tries to register itself as a server. */
  67                 LogDebug("Connection %d: got SERVER command (new server link) ...",
  68                         Client_Conn(Client));
  69
  70                 if (Req->argc != 2 && Req->argc != 3)
  71                         return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  72                                                   Client_ID(Client),
  73                                                   Req->command);
  74
  75                 /* Get configuration index of new remote server ... */
  76                 for (i = 0; i < MAX_SERVERS; i++)
  77                         if (strcasecmp(Req->argv[0], Conf_Server[i].name) == 0)
  78                                 break;
  79
  80                 /* Make sure the remote server is configured here */
  81                 if (i >= MAX_SERVERS) {
  82                         Log(LOG_ERR,
  83                             "Connection %d: Server \"%s\" not configured here!",
  84                             Client_Conn(Client), Req->argv[0]);
  85                         Conn_Close(Client_Conn(Client), NULL,
  86                                    "Server not configured here", true);
  87                         return DISCONNECTED;
  88                 }
  89
  90                 /* Check server password */
  91                 if (strcmp(Conn_Password(Client_Conn(Client)),
  92                     Conf_Server[i].pwd_in) != 0) {
  93                         Log(LOG_ERR,
  94                             "Connection %d: Got bad password from server \"%s\"!",
  95                             Client_Conn(Client), Req->argv[0]);
  96                         Conn_Close(Client_Conn(Client), NULL,
  97                                    "Bad password", true);
  98                         return DISCONNECTED;
  99                 }
 100
 101                 /* Is there a registered server with this ID? */
 102                 if (!Client_CheckID(Client, Req->argv[0]))
 103                         return DISCONNECTED;
 104
 105                 /* Mark this connection as belonging to an configured server */
 106                 if (!Conf_SetServer(i, Client_Conn(Client)))
 107                         return DISCONNECTED;
 108
 109                 Client_SetID( Client, Req->argv[0] );
 110                 Client_SetHops( Client, 1 );
 111                 Client_SetInfo( Client, Req->argv[Req->argc - 1] );
 112
 113                 /* Is this server registering on our side, or are we connecting to
 114                  * a remote server? */
 115                 if (Client_Token(Client) != TOKEN_OUTBOUND) {
 116                         /* Incoming connection, send user/pass */
 117                         if (!IRC_WriteStrClient(Client, "PASS %s %s",
 118                                                 Conf_Server[i].pwd_out,
 119                                                 NGIRCd_ProtoID)
 120                             || !IRC_WriteStrClient(Client, "SERVER %s 1 :%s",
 121                                                    Conf_ServerName,
 122                                                    Conf_ServerInfo)) {
 123                                     Conn_Close(Client_Conn(Client),
 124                                                "Unexpected server behavior!",
 125                                                NULL, false);
 126                                     return DISCONNECTED;
 127                         }
 128                         Client_SetIntroducer(Client, Client);
 129                         Client_SetToken(Client, 1);
 130                 } else {
 131                         /* outgoing connect, we already sent a SERVER and PASS
 132                          * command to the peer */
 133                         Client_SetToken(Client, atoi(Req->argv[1]));
 134                 }
 135
 136                 /* Check protocol level */
 137                 if (Client_Type(Client) == CLIENT_GOTPASS) {
 138                         /* We got a "simple" PASS command, so the peer is
 139                          * using the protocol as defined in RFC 1459. */
 140                         if (! (Conn_Options(Client_Conn(Client)) & CONN_RFC1459))
 141                                 Log(LOG_INFO,
 142                                     "Switching connection %d (\"%s\") to RFC 1459 compatibility mode.",
 143                                     Client_Conn(Client), Client_ID(Client));
 144                         Conn_SetOption(Client_Conn(Client), CONN_RFC1459);
 145                 }
 146
 147                 Client_SetType(Client, CLIENT_UNKNOWNSERVER);
 148
 149 #ifdef ZLIB
 150                 if (Client_HasFlag(Client, 'Z')
 151                     && !Zip_InitConn(Client_Conn(Client))) {
 152                         Conn_Close(Client_Conn(Client),
 153                                    "Can't initialize compression (zlib)!",
 154                                    NULL, false );
 155                         return DISCONNECTED;
 156                 }
 157 #endif
 158
 159 #ifdef IRCPLUS
 160                 if (Client_HasFlag(Client, 'H')) {
 161                         LogDebug("Peer supports IRC+ extended server handshake ...");
 162                         if (!IRC_Send_ISUPPORT(Client))
 163                                 return DISCONNECTED;
 164                         return IRC_WriteStrClient(Client, RPL_ENDOFMOTD_MSG,
 165                                                   Client_ID(Client));
 166                 } else {
 167 #endif
 168                         if (Conf_MaxNickLength != CLIENT_NICK_LEN_DEFAULT)
 169                                 Log(LOG_CRIT,
 170                                     "Attention: this server uses a non-standard nick length, but the peer doesn't support the IRC+ extended server handshake!");
 171 #ifdef IRCPLUS
 172                 }
 173 #endif
 174
 175                 return IRC_Num_ENDOFMOTD(Client, Req);
 176         }
 177         else if( Client_Type( Client ) == CLIENT_SERVER )
 178         {
 179                 /* New server is being introduced to the network */
 180
 181                 if (Req->argc != 4)
 182                         return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 183                                                   Client_ID(Client), Req->command);
 184
 185                 /* check for existing server with same ID */
 186                 if (!Client_CheckID(Client, Req->argv[0]))
 187                         return DISCONNECTED;
 188
 189                 from = Client_Search( Req->prefix );
 190                 if (! from) {
 191                         /* Uh, Server, that introduced the new server is unknown?! */
 192                         Log(LOG_ALERT,
 193                             "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)",
 194                             Req->prefix, Client_Conn(Client));
 195                         Conn_Close(Client_Conn(Client), NULL,
 196                                    "Unknown ID in prefix of SERVER", true);
 197                         return DISCONNECTED;
 198                 }
 199
 200                 c = Client_NewRemoteServer(Client, Req->argv[0], from,
 201                                            atoi(Req->argv[1]), atoi(Req->argv[2]),
 202                                            Req->argv[3], true);
 203                 if (!c) {
 204                         Log(LOG_ALERT,
 205                             "Can't create client structure for server! (on connection %d)",
 206                             Client_Conn(Client));
 207                         Conn_Close(Client_Conn(Client), NULL,
 208                                    "Can't allocate client structure for remote server",
 209                                    true);
 210                         return DISCONNECTED;
 211                 }
 212
 213                 if (Client_Hops(c) > 1 && Req->prefix[0])
 214                         snprintf(str, sizeof(str), "connected to %s, ",
 215                                  Client_ID(from));
 216                 else
 217                         strcpy(str, "");
 218                 Log(LOG_NOTICE|LOG_snotice,
 219                     "Server \"%s\" registered (via %s, %s%d hop%s).",
 220                     Client_ID(c), Client_ID(Client), str, Client_Hops(c),
 221                     Client_Hops(c) > 1 ? "s": "" );
 222
 223                 /* notify other servers */
 224                 IRC_WriteStrServersPrefix(Client, from, "SERVER %s %d %d :%s",
 225                                           Client_ID(c), Client_Hops(c) + 1,
 226                                           Client_MyToken(c), Client_Info(c));
 227
 228                 return CONNECTED;
 229         } else
 230                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 231                                           Client_ID(Client), Req->command);
 232 } /* IRC_SERVER */
 233
 234 /*
 235  * Handler for the IRC "NJOIN" command.
 236  *
 237  * @param Client The client from which this command has been received.
 238  * @param Req Request structure with prefix and all parameters.
 239  * @return CONNECTED or DISCONNECTED.
 240  */
 241 GLOBAL bool
 242 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
 243 {
 244         char nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
 245         bool is_owner, is_chanadmin, is_op, is_halfop, is_voiced;
 246         CHANNEL *chan;
 247         CLIENT *c;
 248
 249         assert(Client != NULL);
 250         assert(Req != NULL);
 251
 252         strlcpy(nick_in, Req->argv[1], sizeof(nick_in));
 253         strcpy(nick_out, "");
 254
 255         channame = Req->argv[0];
 256
 257         ptr = strtok(nick_in, ",");
 258         while (ptr) {
 259                 is_owner = is_chanadmin = is_op = is_halfop = is_voiced = false;
 260
 261                 /* cut off prefixes */
 262                 while ((*ptr == '~') || (*ptr == '&') || (*ptr == '@') ||
 263                        (*ptr == '%') || (*ptr == '+')) {
 264                         if (*ptr == '~')
 265                                 is_owner = true;
 266                         if (*ptr == '&')
 267                                 is_chanadmin = true;
 268                         if (*ptr == '@')
 269                                 is_op = true;
 270                         if (*ptr == '%')
 271                                 is_halfop = true;
 272                         if (*ptr == '+')
 273                                 is_voiced = true;
 274                         ptr++;
 275                 }
 276
 277                 c = Client_Search(ptr);
 278                 if (!c) {
 279                         /* Client not found? */
 280                         Log(LOG_ERR,
 281                             "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!",
 282                             ptr, channame);
 283                         goto skip_njoin;
 284                 }
 285
 286                 if (!Channel_Join(c, channame)) {
 287                         /* Failed to join channel. Ooops!? */
 288                         Log(LOG_ALERT,
 289                             "Failed to join client \"%s\" to channel \"%s\" (NJOIN): killing it!",
 290                             ptr, channame);
 291                         IRC_KillClient(NULL, NULL, ptr, "Internal NJOIN error!");
 292                         Log(LOG_DEBUG, "... done.");
 293                         goto skip_njoin;
 294                 }
 295
 296                 chan = Channel_Search(channame);
 297                 assert(chan != NULL);
 298
 299                 if (is_owner)
 300                         Channel_UserModeAdd(chan, c, 'q');
 301                 if (is_chanadmin)
 302                         Channel_UserModeAdd(chan, c, 'a');
 303                 if (is_op)
 304                         Channel_UserModeAdd(chan, c, 'o');
 305                 if (is_halfop)
 306                         Channel_UserModeAdd(chan, c, 'h');
 307                 if (is_voiced)
 308                         Channel_UserModeAdd(chan, c, 'v');
 309
 310                 /* Announce client to the channel */
 311                 IRC_WriteStrChannelPrefix(Client, chan, c, false,
 312                                           "JOIN :%s", channame);
 313
 314                 /* Announce "channel user modes" to the channel, if any */
 315                 strlcpy(modes, Channel_UserModes(chan, c), sizeof(modes));
 316                 if (modes[0])
 317                         IRC_WriteStrChannelPrefix(Client, chan, Client, false,
 318                                                   "MODE %s +%s %s", channame,
 319                                                   modes, Client_ID(c));
 320
 321                 /* Build nick list for forwarding command */
 322                 if (nick_out[0] != '\0')
 323                         strlcat(nick_out, ",", sizeof(nick_out));
 324                 if (is_owner)
 325                         strlcat(nick_out, "~", sizeof(nick_out));
 326                 if (is_chanadmin)
 327                         strlcat(nick_out, "&", sizeof(nick_out));
 328                 if (is_op)
 329                         strlcat(nick_out, "@", sizeof(nick_out));
 330                 if (is_halfop)
 331                         strlcat(nick_out, "%", sizeof(nick_out));
 332                 if (is_voiced)
 333                         strlcat(nick_out, "+", sizeof(nick_out));
 334                 strlcat(nick_out, ptr, sizeof(nick_out));
 335
 336               skip_njoin:
 337                 /* Get next nick, if any ... */
 338                 ptr = strtok(NULL, ",");
 339         }
 340
 341         /* forward to other servers */
 342         if (nick_out[0] != '\0')
 343                 IRC_WriteStrServersPrefix(Client, Client_ThisServer(),
 344                                           "NJOIN %s :%s", Req->argv[0], nick_out);
 345
 346         return CONNECTED;
 347 } /* IRC_NJOIN */
 348
 349 /**
 350  * Handler for the IRC "SQUIT" command.
 351  *
 352  * @param Client The client from which this command has been received.
 353  * @param Req Request structure with prefix and all parameters.
 354  * @return CONNECTED or DISCONNECTED.
 355  */
 356 GLOBAL bool
 357 IRC_SQUIT(CLIENT * Client, REQUEST * Req)
 358 {
 359         char msg[COMMAND_LEN], logmsg[COMMAND_LEN];
 360         CLIENT *from, *target;
 361         CONN_ID con;
 362         int loglevel;
 363
 364         assert(Client != NULL);
 365         assert(Req != NULL);
 366
 367         if (Client_Type(Client) != CLIENT_SERVER
 368             && !Client_HasMode(Client, 'o'))
 369                 return Op_NoPrivileges(Client, Req);
 370
 371         if (Client_Type(Client) == CLIENT_SERVER && Req->prefix) {
 372                 from = Client_Search(Req->prefix);
 373                 if (Client_Type(from) != CLIENT_SERVER
 374                     && !Op_Check(Client, Req))
 375                         return Op_NoPrivileges(Client, Req);
 376         } else
 377                 from = Client;
 378         if (!from)
 379                 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 380                                           Client_ID(Client), Req->prefix);
 381
 382         if (Client_Type(Client) == CLIENT_USER)
 383                 loglevel = LOG_NOTICE | LOG_snotice;
 384         else
 385                 loglevel = LOG_DEBUG;
 386         Log(loglevel, "Got SQUIT from %s for \"%s\": \"%s\" ...",
 387             Client_ID(from), Req->argv[0], Req->argv[1]);
 388
 389         target = Client_Search(Req->argv[0]);
 390         if (Client_Type(Client) != CLIENT_SERVER &&
 391             target == Client_ThisServer())
 392                 return Op_NoPrivileges(Client, Req);
 393         if (!target) {
 394                 /* The server is (already) unknown */
 395                 Log(LOG_WARNING,
 396                     "Got SQUIT from %s for unknown server \"%s\"!?",
 397                     Client_ID(Client), Req->argv[0]);
 398                 return CONNECTED;
 399         }
 400
 401         con = Client_Conn(target);
 402
 403         if (Req->argv[1][0])
 404                 if (Client_NextHop(from) != Client || con > NONE)
 405                         snprintf(msg, sizeof(msg), "\"%s\" (SQUIT from %s)",
 406                                  Req->argv[1], Client_ID(from));
 407                 else
 408                         strlcpy(msg, Req->argv[1], sizeof(msg));
 409         else
 410                 snprintf(msg, sizeof(msg), "Got SQUIT from %s",
 411                          Client_ID(from));
 412
 413         if (con > NONE) {
 414                 /* We are directly connected to the target server, so we
 415                  * have to tear down the connection and to inform all the
 416                  * other remaining servers in the network */
 417                 IRC_SendWallops(Client_ThisServer(), Client_ThisServer(),
 418                                 "Received SQUIT %s from %s: %s",
 419                                 Req->argv[0], Client_ID(from),
 420                                 Req->argv[1][0] ? Req->argv[1] : "-");
 421                 Conn_Close(con, NULL, msg, true);
 422                 if (con == Client_Conn(Client))
 423                         return DISCONNECTED;
 424         } else {
 425                 /* This server is not directly connected, so the SQUIT must
 426                  * be forwarded ... */
 427                 if (Client_Type(from) != CLIENT_SERVER) {
 428                         /* The origin is not an IRC server, so don't evaluate
 429                          * this SQUIT but simply forward it */
 430                         IRC_WriteStrClientPrefix(Client_NextHop(target),
 431                             from, "SQUIT %s :%s", Req->argv[0], Req->argv[1]);
 432                 } else {
 433                         /* SQUIT has been generated by another server, so
 434                          * remove the target server from the network! */
 435                         logmsg[0] = '\0';
 436                         if (!strchr(msg, '('))
 437                                 snprintf(logmsg, sizeof(logmsg),
 438                                          "\"%s\" (SQUIT from %s)", Req->argv[1],
 439                                          Client_ID(from));
 440                         Client_Destroy(target, logmsg[0] ? logmsg : msg,
 441                                        msg, false);
 442                 }
 443         }
 444         return CONNECTED;
 445 } /* IRC_SQUIT */
 446
 447 /* -eof- */