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  * Handlers for IRC numerics sent to the server
  12  */
  13
  14 #include "portab.h"
  15
  16 #include "imp.h"
  17 #include <assert.h>
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21
  22 #include "defines.h"
  23 #include "resolve.h"
  24 #include "conn.h"
  25 #include "conf.h"
  26 #include "conn.h"
  27 #include "conn-func.h"
  28 #include "client.h"
  29 #include "channel.h"
  30 #include "irc-write.h"
  31 #include "lists.h"
  32 #include "log.h"
  33 #include "messages.h"
  34 #include "parse.h"
  35
  36 #include "exp.h"
  37 #include "numeric.h"
  38
  39
  40 /**
  41  * Announce a channel and its users in the network.
  42  */
  43 static bool
  44 Announce_Channel(CLIENT *Client, CHANNEL *Chan)
  45 {
  46         CL2CHAN *cl2chan;
  47         CLIENT *cl;
  48         char str[LINE_LEN], *ptr;
  49         bool njoin;
  50
  51         if (Conn_Options(Client_Conn(Client)) & CONN_RFC1459)
  52                 njoin = false;
  53         else
  54                 njoin = true;
  55
  56         /* Get all the members of this channel */
  57         cl2chan = Channel_FirstMember(Chan);
  58         snprintf(str, sizeof(str), "NJOIN %s :", Channel_Name(Chan));
  59         while (cl2chan) {
  60                 cl = Channel_GetClient(cl2chan);
  61                 assert(cl != NULL);
  62
  63                 if (njoin) {
  64                         /* RFC 2813: send NJOIN with nick names and modes
  65                          * (if user is channel operator or has voice) */
  66                         if (str[strlen(str) - 1] != ':')
  67                                 strlcat(str, ",", sizeof(str));
  68                         if (strchr(Channel_UserModes(Chan, cl), 'v'))
  69                                 strlcat(str, "+", sizeof(str));
  70                         if (strchr(Channel_UserModes(Chan, cl), 'o'))
  71                                 strlcat(str, "@", sizeof(str));
  72                         strlcat(str, Client_ID(cl), sizeof(str));
  73
  74                         /* Send the data if the buffer is "full" */
  75                         if (strlen(str) > (LINE_LEN - CLIENT_NICK_LEN - 8)) {
  76                                 if (!IRC_WriteStrClient(Client, "%s", str))
  77                                         return DISCONNECTED;
  78                                 snprintf(str, sizeof(str), "NJOIN %s :",
  79                                          Channel_Name(Chan));
  80                         }
  81                 } else {
  82                         /* RFC 1459: no NJOIN, send JOIN and MODE */
  83                         if (!IRC_WriteStrClientPrefix(Client, cl, "JOIN %s",
  84                                                 Channel_Name(Chan)))
  85                                 return DISCONNECTED;
  86                         ptr = Channel_UserModes(Chan, cl);
  87                         while (*ptr) {
  88                                 if (!IRC_WriteStrClientPrefix(Client, cl,
  89                                                    "MODE %s +%c %s",
  90                                                    Channel_Name(Chan), ptr[0],
  91                                                    Client_ID(cl)))
  92                                         return DISCONNECTED;
  93                                 ptr++;
  94                         }
  95                 }
  96
  97                 cl2chan = Channel_NextMember(Chan, cl2chan);
  98         }
  99
 100         /* Data left in the buffer? */
 101         if (str[strlen(str) - 1] != ':') {
 102                 /* Yes, send it ... */
 103                 if (!IRC_WriteStrClient(Client, "%s", str))
 104                         return DISCONNECTED;
 105         }
 106
 107         return CONNECTED;
 108 } /* Announce_Channel */
 109
 110
 111 /**
 112  * Announce new server in the network
 113  * @param Client New server
 114  * @param Server Existing server in the network
 115  */
 116 static bool
 117 Announce_Server(CLIENT * Client, CLIENT * Server)
 118 {
 119         CLIENT *c;
 120
 121         if (Client_Conn(Server) > NONE) {
 122                 /* Announce the new server to the one already registered
 123                  * which is directly connected to the local server */
 124                 if (!IRC_WriteStrClient
 125                     (Server, "SERVER %s %d %d :%s", Client_ID(Client),
 126                      Client_Hops(Client) + 1, Client_MyToken(Client),
 127                      Client_Info(Client)))
 128                         return DISCONNECTED;
 129         }
 130
 131         if (Client_Hops(Server) == 1)
 132                 c = Client_ThisServer();
 133         else
 134                 c = Client_Introducer(Server);
 135
 136         /* Inform new server about the one already registered in the network */
 137         return IRC_WriteStrClientPrefix(Client, c, "SERVER %s %d %d :%s",
 138                 Client_ID(Server), Client_Hops(Server) + 1,
 139                 Client_MyToken(Server), Client_Info(Server));
 140 } /* Announce_Server */
 141
 142
 143 /**
 144  * Announce existing user to a new server
 145  * @param Client New server
 146  * @param User Existing user in the network
 147  */
 148 static bool
 149 Announce_User(CLIENT * Client, CLIENT * User)
 150 {
 151         CONN_ID conn;
 152         char *modes;
 153
 154         conn = Client_Conn(Client);
 155         if (Conn_Options(conn) & CONN_RFC1459) {
 156                 /* RFC 1459 mode: separate NICK and USER commands */
 157                 if (! Conn_WriteStr(conn, "NICK %s :%d",
 158                                     Client_ID(User), Client_Hops(User) + 1))
 159                         return DISCONNECTED;
 160                 if (! Conn_WriteStr(conn, ":%s USER %s %s %s :%s",
 161                                      Client_ID(User), Client_User(User),
 162                                      Client_Hostname(User),
 163                                      Client_ID(Client_Introducer(User)),
 164                                      Client_Info(User)))
 165                         return DISCONNECTED;
 166                 modes = Client_Modes(User);
 167                 if (modes[0]) {
 168                         return Conn_WriteStr(conn, ":%s MODE %s +%s",
 169                                      Client_ID(User), Client_ID(User),
 170                                      modes);
 171                 }
 172                 return CONNECTED;
 173         } else {
 174                 /* RFC 2813 mode: one combined NICK or SERVICE command */
 175                 if (Client_Type(User) == CLIENT_SERVICE
 176                     && strchr(Client_Flags(Client), 'S'))
 177                         return IRC_WriteStrClient(Client,
 178                                 "SERVICE %s %d * +%s %d :%s", Client_Mask(User),
 179                                 Client_MyToken(Client_Introducer(User)),
 180                                 Client_Modes(User), Client_Hops(User) + 1,
 181                                 Client_Info(User));
 182                 else
 183                         return IRC_WriteStrClient(Client,
 184                                 "NICK %s %d %s %s %d +%s :%s",
 185                                 Client_ID(User), Client_Hops(User) + 1,
 186                                 Client_User(User), Client_Hostname(User),
 187                                 Client_MyToken(Client_Introducer(User)),
 188                                 Client_Modes(User), Client_Info(User));
 189         }
 190 } /* Announce_User */
 191
 192
 193 #ifdef IRCPLUS
 194
 195 /**
 196  * Synchronize invite and ban lists between servers
 197  * @param Client New server
 198  */
 199 static bool
 200 Synchronize_Lists(CLIENT * Client)
 201 {
 202         CHANNEL *c;
 203         struct list_head *head;
 204         struct list_elem *elem;
 205
 206         assert(Client != NULL);
 207
 208         c = Channel_First();
 209         while (c) {
 210                 /* ban list */
 211                 head = Channel_GetListBans(c);
 212                 elem = Lists_GetFirst(head);
 213                 while (elem) {
 214                         if (!IRC_WriteStrClient(Client, "MODE %s +b %s",
 215                                                 Channel_Name(c),
 216                                                 Lists_GetMask(elem))) {
 217                                 return DISCONNECTED;
 218                         }
 219                         elem = Lists_GetNext(elem);
 220                 }
 221
 222                 /* invite list */
 223                 head = Channel_GetListInvites(c);
 224                 elem = Lists_GetFirst(head);
 225                 while (elem) {
 226                         if (!IRC_WriteStrClient(Client, "MODE %s +I %s",
 227                                                 Channel_Name(c),
 228                                                 Lists_GetMask(elem))) {
 229                                 return DISCONNECTED;
 230                         }
 231                         elem = Lists_GetNext(elem);
 232                 }
 233
 234                 c = Channel_Next(c);
 235         }
 236         return CONNECTED;
 237 }
 238
 239
 240 /**
 241  * Send CHANINFO commands to a new server (inform it about existing channels).
 242  * @param Client New server
 243  * @param Chan Channel
 244  */
 245 static bool
 246 Send_CHANINFO(CLIENT * Client, CHANNEL * Chan)
 247 {
 248         char *modes, *topic;
 249         bool has_k, has_l;
 250
 251 #ifdef DEBUG
 252         Log(LOG_DEBUG, "Sending CHANINFO commands ...");
 253 #endif
 254
 255         modes = Channel_Modes(Chan);
 256         topic = Channel_Topic(Chan);
 257
 258         if (!*modes && !*topic)
 259                 return CONNECTED;
 260
 261         has_k = strchr(modes, 'k') != NULL;
 262         has_l = strchr(modes, 'l') != NULL;
 263
 264         /* send CHANINFO */
 265         if (!has_k && !has_l) {
 266                 if (!*topic) {
 267                         /* "CHANINFO <chan> +<modes>" */
 268                         return IRC_WriteStrClient(Client, "CHANINFO %s +%s",
 269                                                   Channel_Name(Chan), modes);
 270                 }
 271                 /* "CHANINFO <chan> +<modes> :<topic>" */
 272                 return IRC_WriteStrClient(Client, "CHANINFO %s +%s :%s",
 273                                           Channel_Name(Chan), modes, topic);
 274         }
 275         /* "CHANINFO <chan> +<modes> <key> <limit> :<topic>" */
 276         return IRC_WriteStrClient(Client, "CHANINFO %s +%s %s %lu :%s",
 277                                   Channel_Name(Chan), modes,
 278                                   has_k ? Channel_Key(Chan) : "*",
 279                                   has_l ? Channel_MaxUsers(Chan) : 0, topic);
 280 } /* Send_CHANINFO */
 281
 282 #endif /* IRCPLUS */
 283
 284
 285 /**
 286  * Handle ENDOFMOTD (376) numeric and login remote server.
 287  * The peer is either an IRC server (no IRC+ protocol), or we got the
 288  * ENDOFMOTD numeric from an IRC+ server. We have to register the new server.
 289  */
 290 GLOBAL bool
 291 IRC_Num_ENDOFMOTD(CLIENT * Client, UNUSED REQUEST * Req)
 292 {
 293         int max_hops, i;
 294         CLIENT *c;
 295         CHANNEL *chan;
 296
 297         Client_SetType(Client, CLIENT_SERVER);
 298
 299         Log(LOG_NOTICE | LOG_snotice,
 300             "Server \"%s\" registered (connection %d, 1 hop - direct link).",
 301             Client_ID(Client), Client_Conn(Client));
 302
 303         /* Get highest hop count */
 304         max_hops = 0;
 305         c = Client_First();
 306         while (c) {
 307                 if (Client_Hops(c) > max_hops)
 308                         max_hops = Client_Hops(c);
 309                 c = Client_Next(c);
 310         }
 311
 312         /* Inform the new server about all other servers, and announce the
 313          * new server to all the already registered ones. Important: we have
 314          * to do this "in order" and can't introduce servers of which the
 315          * "toplevel server" isn't known already. */
 316         for (i = 0; i < (max_hops + 1); i++) {
 317                 for (c = Client_First(); c != NULL; c = Client_Next(c)) {
 318                         if (Client_Type(c) != CLIENT_SERVER)
 319                                 continue;       /* not a server */
 320                         if (Client_Hops(c) != i)
 321                                 continue;       /* not actual "nesting level" */
 322                         if (c == Client || c == Client_ThisServer())
 323                                 continue;       /* that's us or the peer! */
 324
 325                         if (!Announce_Server(Client, c))
 326                                 return DISCONNECTED;
 327                 }
 328         }
 329
 330         /* Announce all the users to the new server */
 331         c = Client_First();
 332         while (c) {
 333                 if (Client_Type(c) == CLIENT_USER ||
 334                     Client_Type(c) == CLIENT_SERVICE) {
 335                         if (!Announce_User(Client, c))
 336                                 return DISCONNECTED;
 337                 }
 338                 c = Client_Next(c);
 339         }
 340
 341         /* Announce all channels to the new server */
 342         chan = Channel_First();
 343         while (chan) {
 344 #ifdef IRCPLUS
 345                 /* Send CHANINFO if the peer supports it */
 346                 if (strchr(Client_Flags(Client), 'C')) {
 347                         if (!Send_CHANINFO(Client, chan))
 348                                 return DISCONNECTED;
 349                 }
 350 #endif
 351
 352                 if (!Announce_Channel(Client, chan))
 353                         return DISCONNECTED;
 354
 355                 /* Get next channel ... */
 356                 chan = Channel_Next(chan);
 357         }
 358
 359 #ifdef IRCPLUS
 360         if (strchr(Client_Flags(Client), 'L')) {
 361                 LogDebug("Synchronizing INVITE- and BAN-lists ...");
 362                 if (!Synchronize_Lists(Client))
 363                         return DISCONNECTED;
 364         }
 365 #endif
 366
 367         return CONNECTED;
 368 } /* IRC_Num_ENDOFMOTD */
 369
 370
 371 /**
 372  * Handle ISUPPORT (005) numeric.
 373  */
 374 GLOBAL bool
 375 IRC_Num_ISUPPORT(CLIENT * Client, REQUEST * Req)
 376 {
 377         int i;
 378         char *key, *value;
 379
 380         for (i = 1; i < Req->argc - 1; i++) {
 381                 key = Req->argv[i];
 382                 value = strchr(key, '=');
 383                 if (value)
 384                         *value++ = '\0';
 385                 else
 386                         value = "";
 387
 388                 if (strcmp("NICKLEN", key) == 0) {
 389                         if ((unsigned int)atol(value) == Conf_MaxNickLength - 1)
 390                                 continue;
 391
 392                         /* Nick name length settings are different! */
 393                         Log(LOG_ERR,
 394                             "Peer uses incompatible nick name length (%d/%d)! Disconnecting ...",
 395                             Conf_MaxNickLength - 1, atoi(value));
 396                         Conn_Close(Client_Conn(Client),
 397                                    "Incompatible nick name length",
 398                                    NULL, false);
 399                         return DISCONNECTED;
 400                 }
 401         }
 402
 403         return CONNECTED;
 404 } /* IRC_Num_ISUPPORT */
 405
 406
 407 /* -eof- */