src/ngircd/numeric.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2008 Alexander Barton (alex@barton.de)
   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  * Handlers for IRC numerics sent to the server
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "defines.h"
  26 #include "conn.h"
  27 #include "conf.h"
  28 #include "conn.h"
  29 #include "conn-func.h"
  30 #include "channel.h"
  31 #include "class.h"
  32 #include "irc-write.h"
  33 #include "lists.h"
  34 #include "log.h"
  35 #include "messages.h"
  36 #include "parse.h"
  37
  38 #include "exp.h"
  39 #include "numeric.h"
  40
  41
  42 /**
  43  * Announce a channel and its users in the network.
  44  */
  45 static bool
  46 Announce_Channel(CLIENT *Client, CHANNEL *Chan)
  47 {
  48         CL2CHAN *cl2chan;
  49         CLIENT *cl;
  50         char str[LINE_LEN], *ptr;
  51         bool njoin, xop;
  52
  53         /* Check features of remote server */
  54         njoin = Conn_Options(Client_Conn(Client)) & CONN_RFC1459 ? false : true;
  55         xop = strchr(Client_Flags(Client), 'X') ? true : false;
  56
  57         /* Get all the members of this channel */
  58         cl2chan = Channel_FirstMember(Chan);
  59         snprintf(str, sizeof(str), "NJOIN %s :", Channel_Name(Chan));
  60         while (cl2chan) {
  61                 cl = Channel_GetClient(cl2chan);
  62                 assert(cl != NULL);
  63
  64                 if (njoin) {
  65                         /* RFC 2813: send NJOIN with nicknames and modes
  66                          * (if user is channel operator or has voice) */
  67                         if (str[strlen(str) - 1] != ':')
  68                                 strlcat(str, ",", sizeof(str));
  69
  70                         /* Prepare user prefix (ChanOp, voiced, ...) */
  71                         if (xop && strchr(Channel_UserModes(Chan, cl), 'q'))
  72                                 strlcat(str, "~", sizeof(str));
  73                         if (xop && strchr(Channel_UserModes(Chan, cl), 'a'))
  74                                 strlcat(str, "&", sizeof(str));
  75                         if (strchr(Channel_UserModes(Chan, cl), 'o'))
  76                                 strlcat(str, "@", sizeof(str));
  77                         if (xop && strchr(Channel_UserModes(Chan, cl), 'h'))
  78                                 strlcat(str, "%", sizeof(str));
  79                         if (strchr(Channel_UserModes(Chan, cl), 'v'))
  80                                 strlcat(str, "+", sizeof(str));
  81
  82                         strlcat(str, Client_ID(cl), sizeof(str));
  83
  84                         /* Send the data if the buffer is "full" */
  85                         if (strlen(str) > (LINE_LEN - CLIENT_NICK_LEN - 8)) {
  86                                 if (!IRC_WriteStrClient(Client, "%s", str))
  87                                         return DISCONNECTED;
  88                                 snprintf(str, sizeof(str), "NJOIN %s :",
  89                                          Channel_Name(Chan));
  90                         }
  91                 } else {
  92                         /* RFC 1459: no NJOIN, send JOIN and MODE */
  93                         if (!IRC_WriteStrClientPrefix(Client, cl, "JOIN %s",
  94                                                 Channel_Name(Chan)))
  95                                 return DISCONNECTED;
  96                         ptr = Channel_UserModes(Chan, cl);
  97                         while (*ptr) {
  98                                 if (!IRC_WriteStrClientPrefix(Client, cl,
  99                                                    "MODE %s +%c %s",
 100                                                    Channel_Name(Chan), ptr[0],
 101                                                    Client_ID(cl)))
 102                                         return DISCONNECTED;
 103                                 ptr++;
 104                         }
 105                 }
 106
 107                 cl2chan = Channel_NextMember(Chan, cl2chan);
 108         }
 109
 110         /* Data left in the buffer? */
 111         if (str[strlen(str) - 1] != ':') {
 112                 /* Yes, send it ... */
 113                 if (!IRC_WriteStrClient(Client, "%s", str))
 114                         return DISCONNECTED;
 115         }
 116
 117         return CONNECTED;
 118 } /* Announce_Channel */
 119
 120
 121 /**
 122  * Announce new server in the network
 123  * @param Client New server
 124  * @param Server Existing server in the network
 125  */
 126 static bool
 127 Announce_Server(CLIENT * Client, CLIENT * Server)
 128 {
 129         CLIENT *c;
 130
 131         if (Client_Conn(Server) > NONE) {
 132                 /* Announce the new server to the one already registered
 133                  * which is directly connected to the local server */
 134                 if (!IRC_WriteStrClient
 135                     (Server, "SERVER %s %d %d :%s", Client_ID(Client),
 136                      Client_Hops(Client) + 1, Client_MyToken(Client),
 137                      Client_Info(Client)))
 138                         return DISCONNECTED;
 139         }
 140
 141         if (Client_Hops(Server) == 1)
 142                 c = Client_ThisServer();
 143         else
 144                 c = Client_TopServer(Server);
 145
 146         /* Inform new server about the one already registered in the network */
 147         return IRC_WriteStrClientPrefix(Client, c, "SERVER %s %d %d :%s",
 148                 Client_ID(Server), Client_Hops(Server) + 1,
 149                 Client_MyToken(Server), Client_Info(Server));
 150 } /* Announce_Server */
 151
 152
 153 /**
 154  * Announce existing user to a new server
 155  * @param Client New server
 156  * @param User Existing user in the network
 157  */
 158 static bool
 159 Announce_User(CLIENT * Client, CLIENT * User)
 160 {
 161         CONN_ID conn;
 162         char *modes;
 163
 164         conn = Client_Conn(Client);
 165         if (Conn_Options(conn) & CONN_RFC1459) {
 166                 /* RFC 1459 mode: separate NICK and USER commands */
 167                 if (! Conn_WriteStr(conn, "NICK %s :%d",
 168                                     Client_ID(User), Client_Hops(User) + 1))
 169                         return DISCONNECTED;
 170                 if (! Conn_WriteStr(conn, ":%s USER %s %s %s :%s",
 171                                      Client_ID(User), Client_User(User),
 172                                      Client_Hostname(User),
 173                                      Client_ID(Client_Introducer(User)),
 174                                      Client_Info(User)))
 175                         return DISCONNECTED;
 176                 modes = Client_Modes(User);
 177                 if (modes[0]) {
 178                         return Conn_WriteStr(conn, ":%s MODE %s +%s",
 179                                      Client_ID(User), Client_ID(User),
 180                                      modes);
 181                 }
 182                 return CONNECTED;
 183         } else {
 184                 /* RFC 2813 mode: one combined NICK or SERVICE command */
 185                 if (Client_Type(User) == CLIENT_SERVICE
 186                     && strchr(Client_Flags(Client), 'S'))
 187                         return IRC_WriteStrClient(Client,
 188                                 "SERVICE %s %d * +%s %d :%s", Client_Mask(User),
 189                                 Client_MyToken(Client_Introducer(User)),
 190                                 Client_Modes(User), Client_Hops(User) + 1,
 191                                 Client_Info(User));
 192                 else
 193                         return IRC_WriteStrClient(Client,
 194                                 "NICK %s %d %s %s %d +%s :%s",
 195                                 Client_ID(User), Client_Hops(User) + 1,
 196                                 Client_User(User), Client_Hostname(User),
 197                                 Client_MyToken(Client_Introducer(User)),
 198                                 Client_Modes(User), Client_Info(User));
 199         }
 200 } /* Announce_User */
 201
 202
 203 #ifdef IRCPLUS
 204
 205 /**
 206  * Synchronize invite, ban, G- and K-Line lists between servers.
 207  *
 208  * @param Client New server.
 209  * @return CONNECTED or DISCONNECTED.
 210  */
 211 static bool
 212 Synchronize_Lists(CLIENT * Client)
 213 {
 214         CHANNEL *c;
 215         struct list_head *head;
 216         struct list_elem *elem;
 217
 218         assert(Client != NULL);
 219
 220         /* g-lines */
 221         head = Class_GetList(CLASS_GLINE);
 222         elem = Lists_GetFirst(head);
 223         while (elem) {
 224                 if (!IRC_WriteStrClient(Client, "GLINE %s %ld :%s",
 225                                         Lists_GetMask(elem),
 226                                         Lists_GetValidity(elem) - time(NULL),
 227                                         Lists_GetReason(elem)))
 228                         return DISCONNECTED;
 229                 elem = Lists_GetNext(elem);
 230         }
 231
 232         c = Channel_First();
 233         while (c) {
 234                 /* ban list */
 235                 head = Channel_GetListBans(c);
 236                 elem = Lists_GetFirst(head);
 237                 while (elem) {
 238                         if (!IRC_WriteStrClient(Client, "MODE %s +b %s",
 239                                                 Channel_Name(c),
 240                                                 Lists_GetMask(elem))) {
 241                                 return DISCONNECTED;
 242                         }
 243                         elem = Lists_GetNext(elem);
 244                 }
 245
 246                 /* invite list */
 247                 head = Channel_GetListInvites(c);
 248                 elem = Lists_GetFirst(head);
 249                 while (elem) {
 250                         if (!IRC_WriteStrClient(Client, "MODE %s +I %s",
 251                                                 Channel_Name(c),
 252                                                 Lists_GetMask(elem))) {
 253                                 return DISCONNECTED;
 254                         }
 255                         elem = Lists_GetNext(elem);
 256                 }
 257
 258                 c = Channel_Next(c);
 259         }
 260         return CONNECTED;
 261 }
 262
 263
 264 /**
 265  * Send CHANINFO commands to a new server (inform it about existing channels).
 266  * @param Client New server
 267  * @param Chan Channel
 268  */
 269 static bool
 270 Send_CHANINFO(CLIENT * Client, CHANNEL * Chan)
 271 {
 272         char *modes, *topic;
 273         bool has_k, has_l;
 274
 275 #ifdef DEBUG
 276         Log(LOG_DEBUG, "Sending CHANINFO commands ...");
 277 #endif
 278
 279         modes = Channel_Modes(Chan);
 280         topic = Channel_Topic(Chan);
 281
 282         if (!*modes && !*topic)
 283                 return CONNECTED;
 284
 285         has_k = strchr(modes, 'k') != NULL;
 286         has_l = strchr(modes, 'l') != NULL;
 287
 288         /* send CHANINFO */
 289         if (!has_k && !has_l) {
 290                 if (!*topic) {
 291                         /* "CHANINFO <chan> +<modes>" */
 292                         return IRC_WriteStrClient(Client, "CHANINFO %s +%s",
 293                                                   Channel_Name(Chan), modes);
 294                 }
 295                 /* "CHANINFO <chan> +<modes> :<topic>" */
 296                 return IRC_WriteStrClient(Client, "CHANINFO %s +%s :%s",
 297                                           Channel_Name(Chan), modes, topic);
 298         }
 299         /* "CHANINFO <chan> +<modes> <key> <limit> :<topic>" */
 300         return IRC_WriteStrClient(Client, "CHANINFO %s +%s %s %lu :%s",
 301                                   Channel_Name(Chan), modes,
 302                                   has_k ? Channel_Key(Chan) : "*",
 303                                   has_l ? Channel_MaxUsers(Chan) : 0, topic);
 304 } /* Send_CHANINFO */
 305
 306 #endif /* IRCPLUS */
 307
 308
 309 /**
 310  * Handle ENDOFMOTD (376) numeric and login remote server.
 311  * The peer is either an IRC server (no IRC+ protocol), or we got the
 312  * ENDOFMOTD numeric from an IRC+ server. We have to register the new server.
 313  */
 314 GLOBAL bool
 315 IRC_Num_ENDOFMOTD(CLIENT * Client, UNUSED REQUEST * Req)
 316 {
 317         int max_hops, i;
 318         CLIENT *c;
 319         CHANNEL *chan;
 320
 321         Client_SetType(Client, CLIENT_SERVER);
 322
 323         Log(LOG_NOTICE | LOG_snotice,
 324             "Server \"%s\" registered (connection %d, 1 hop - direct link).",
 325             Client_ID(Client), Client_Conn(Client));
 326
 327         /* Get highest hop count */
 328         max_hops = 0;
 329         c = Client_First();
 330         while (c) {
 331                 if (Client_Hops(c) > max_hops)
 332                         max_hops = Client_Hops(c);
 333                 c = Client_Next(c);
 334         }
 335
 336         /* Inform the new server about all other servers, and announce the
 337          * new server to all the already registered ones. Important: we have
 338          * to do this "in order" and can't introduce servers of which the
 339          * "toplevel server" isn't known already. */
 340         for (i = 0; i < (max_hops + 1); i++) {
 341                 for (c = Client_First(); c != NULL; c = Client_Next(c)) {
 342                         if (Client_Type(c) != CLIENT_SERVER)
 343                                 continue;       /* not a server */
 344                         if (Client_Hops(c) != i)
 345                                 continue;       /* not actual "nesting level" */
 346                         if (c == Client || c == Client_ThisServer())
 347                                 continue;       /* that's us or the peer! */
 348
 349                         if (!Announce_Server(Client, c))
 350                                 return DISCONNECTED;
 351                 }
 352         }
 353
 354         /* Announce all the users to the new server */
 355         c = Client_First();
 356         while (c) {
 357                 if (Client_Type(c) == CLIENT_USER ||
 358                     Client_Type(c) == CLIENT_SERVICE) {
 359                         if (!Announce_User(Client, c))
 360                                 return DISCONNECTED;
 361                 }
 362                 c = Client_Next(c);
 363         }
 364
 365         /* Announce all channels to the new server */
 366         chan = Channel_First();
 367         while (chan) {
 368                 if (Channel_IsLocal(chan)) {
 369                         chan = Channel_Next(chan);
 370                         continue;
 371                 }
 372 #ifdef IRCPLUS
 373                 /* Send CHANINFO if the peer supports it */
 374                 if (strchr(Client_Flags(Client), 'C')) {
 375                         if (!Send_CHANINFO(Client, chan))
 376                                 return DISCONNECTED;
 377                 }
 378 #endif
 379
 380                 if (!Announce_Channel(Client, chan))
 381                         return DISCONNECTED;
 382
 383                 /* Get next channel ... */
 384                 chan = Channel_Next(chan);
 385         }
 386
 387 #ifdef IRCPLUS
 388         if (strchr(Client_Flags(Client), 'L')) {
 389                 LogDebug("Synchronizing INVITE- and BAN-lists ...");
 390                 if (!Synchronize_Lists(Client))
 391                         return DISCONNECTED;
 392         }
 393 #endif
 394
 395         if (!IRC_WriteStrClient(Client, "PING :%s",
 396             Client_ID(Client_ThisServer())))
 397                 return DISCONNECTED;
 398
 399         return CONNECTED;
 400 } /* IRC_Num_ENDOFMOTD */
 401
 402
 403 /**
 404  * Handle ISUPPORT (005) numeric.
 405  */
 406 GLOBAL bool
 407 IRC_Num_ISUPPORT(CLIENT * Client, REQUEST * Req)
 408 {
 409         int i;
 410         char *key, *value;
 411
 412         for (i = 1; i < Req->argc - 1; i++) {
 413                 key = Req->argv[i];
 414                 value = strchr(key, '=');
 415                 if (value)
 416                         *value++ = '\0';
 417                 else
 418                         value = "";
 419
 420                 if (strcmp("NICKLEN", key) == 0) {
 421                         if ((unsigned int)atol(value) == Conf_MaxNickLength - 1)
 422                                 continue;
 423
 424                         /* Nickname length settings are different! */
 425                         Log(LOG_ERR,
 426                             "Peer uses incompatible nickname length (%d/%d)! Disconnecting ...",
 427                             Conf_MaxNickLength - 1, atoi(value));
 428                         Conn_Close(Client_Conn(Client),
 429                                    "Incompatible nickname length",
 430                                    NULL, false);
 431                         return DISCONNECTED;
 432                 }
 433         }
 434
 435         return CONNECTED;
 436 } /* IRC_Num_ISUPPORT */
 437
 438
 439 /* -eof- */