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