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         char *modes;
  82
  83         conn = Client_Conn(Client);
  84         if (Conn_Options(conn) & CONN_RFC1459) {
  85                 /* RFC 1459 mode: separate NICK and USER commands */
  86                 if (! Conn_WriteStr(conn, "NICK %s :%d",
  87                                     Client_ID(User), Client_Hops(User) + 1))
  88                         return DISCONNECTED;
  89                 if (! Conn_WriteStr(conn, ":%s USER %s %s %s :%s",
  90                                      Client_ID(User), Client_User(User),
  91                                      Client_Hostname(User),
  92                                      Client_ID(Client_Introducer(User)),
  93                                      Client_Info(User)))
  94                         return DISCONNECTED;
  95                 modes = Client_Modes(User);
  96                 if (modes[0]) {
  97                         return Conn_WriteStr(conn, ":%s MODE %s +%s",
  98                                      Client_ID(User), Client_ID(User),
  99                                      modes);
 100                 }
 101                 return CONNECTED;
 102         } else {
 103                 /* RFC 2813 mode: one combined NICK command */
 104                 return IRC_WriteStrClient(Client, "NICK %s %d %s %s %d +%s :%s",
 105                                 Client_ID(User), Client_Hops(User) + 1,
 106                                 Client_User(User), Client_Hostname(User),
 107                                 Client_MyToken(Client_Introducer(User)),
 108                                 Client_Modes(User), Client_Info(User));
 109         }
 110 } /* Announce_User */
 111
 112
 113 #ifdef IRCPLUS
 114
 115 /**
 116  * Synchronize invite and ban lists between servers
 117  * @param Client New server
 118  */
 119 static bool
 120 Synchronize_Lists(CLIENT * Client)
 121 {
 122         CHANNEL *c;
 123         struct list_head *head;
 124         struct list_elem *elem;
 125
 126         assert(Client != NULL);
 127
 128         c = Channel_First();
 129         while (c) {
 130                 /* ban list */
 131                 head = Channel_GetListBans(c);
 132                 elem = Lists_GetFirst(head);
 133                 while (elem) {
 134                         if (!IRC_WriteStrClient(Client, "MODE %s +b %s",
 135                                                 Channel_Name(c),
 136                                                 Lists_GetMask(elem))) {
 137                                 return DISCONNECTED;
 138                         }
 139                         elem = Lists_GetNext(elem);
 140                 }
 141
 142                 /* invite list */
 143                 head = Channel_GetListInvites(c);
 144                 elem = Lists_GetFirst(head);
 145                 while (elem) {
 146                         if (!IRC_WriteStrClient(Client, "MODE %s +I %s",
 147                                                 Channel_Name(c),
 148                                                 Lists_GetMask(elem))) {
 149                                 return DISCONNECTED;
 150                         }
 151                         elem = Lists_GetNext(elem);
 152                 }
 153
 154                 c = Channel_Next(c);
 155         }
 156         return CONNECTED;
 157 }
 158
 159
 160 /**
 161  * Send CHANINFO commands to a new server (inform it about existing channels).
 162  * @param Client New server
 163  * @param Chan Channel
 164  */
 165 static bool
 166 Send_CHANINFO(CLIENT * Client, CHANNEL * Chan)
 167 {
 168         char *modes, *topic;
 169         bool has_k, has_l;
 170
 171 #ifdef DEBUG
 172         Log(LOG_DEBUG, "Sending CHANINFO commands ...");
 173 #endif
 174
 175         modes = Channel_Modes(Chan);
 176         topic = Channel_Topic(Chan);
 177
 178         if (!*modes && !*topic)
 179                 return CONNECTED;
 180
 181         has_k = strchr(modes, 'k') != NULL;
 182         has_l = strchr(modes, 'l') != NULL;
 183
 184         /* send CHANINFO */
 185         if (!has_k && !has_l) {
 186                 if (!*topic) {
 187                         /* "CHANINFO <chan> +<modes>" */
 188                         return IRC_WriteStrClient(Client, "CHANINFO %s +%s",
 189                                                   Channel_Name(Chan), modes);
 190                 }
 191                 /* "CHANINFO <chan> +<modes> :<topic>" */
 192                 return IRC_WriteStrClient(Client, "CHANINFO %s +%s :%s",
 193                                           Channel_Name(Chan), modes, topic);
 194         }
 195         /* "CHANINFO <chan> +<modes> <key> <limit> :<topic>" */
 196         return IRC_WriteStrClient(Client, "CHANINFO %s +%s %s %lu :%s",
 197                                   Channel_Name(Chan), modes,
 198                                   has_k ? Channel_Key(Chan) : "*",
 199                                   has_l ? Channel_MaxUsers(Chan) : 0, topic);
 200 } /* Send_CHANINFO */
 201
 202 #endif /* IRCPLUS */
 203
 204
 205 /**
 206  * Handle ENDOFMOTD (376) numeric and login remote server.
 207  * The peer is either an IRC server (no IRC+ protocol), or we got the
 208  * ENDOFMOTD numeric from an IRC+ server. We have to register the new server.
 209  */
 210 GLOBAL bool
 211 IRC_Num_ENDOFMOTD(CLIENT * Client, UNUSED REQUEST * Req)
 212 {
 213         char str[LINE_LEN];
 214         int max_hops, i;
 215         CLIENT *c, *cl;
 216         CHANNEL *chan;
 217         CL2CHAN *cl2chan;
 218
 219         Client_SetType(Client, CLIENT_SERVER);
 220
 221         Log(LOG_NOTICE | LOG_snotice,
 222             "Server \"%s\" registered (connection %d, 1 hop - direct link).",
 223             Client_ID(Client), Client_Conn(Client));
 224
 225         /* Get highest hop count */
 226         max_hops = 0;
 227         c = Client_First();
 228         while (c) {
 229                 if (Client_Hops(c) > max_hops)
 230                         max_hops = Client_Hops(c);
 231                 c = Client_Next(c);
 232         }
 233
 234         /* Inform the new server about all other servers, and announce the
 235          * new server to all the already registered ones. Important: we have
 236          * to do this "in order" and can't introduce servers of which the
 237          * "toplevel server" isn't known already. */
 238         for (i = 0; i < (max_hops + 1); i++) {
 239                 for (c = Client_First(); c != NULL; c = Client_Next(c)) {
 240                         if (Client_Type(c) != CLIENT_SERVER)
 241                                 continue;       /* not a server */
 242                         if (Client_Hops(c) != i)
 243                                 continue;       /* not actual "nesting level" */
 244                         if (c == Client || c == Client_ThisServer())
 245                                 continue;       /* that's us or the peer! */
 246
 247                         if (!Announce_Server(Client, c))
 248                                 return DISCONNECTED;
 249                 }
 250         }
 251
 252         /* Announce all the users to the new server */
 253         c = Client_First();
 254         while (c) {
 255                 if (Client_Type(c) == CLIENT_USER) {
 256                         if (!Announce_User(Client, c))
 257                                 return DISCONNECTED;
 258                 }
 259                 c = Client_Next(c);
 260         }
 261
 262         /* Announce all channels to the new server */
 263         chan = Channel_First();
 264         while (chan) {
 265 #ifdef IRCPLUS
 266                 /* Send CHANINFO if the peer supports it */
 267                 if (strchr(Client_Flags(Client), 'C')) {
 268                         if (!Send_CHANINFO(Client, chan))
 269                                 return DISCONNECTED;
 270                 }
 271 #endif
 272
 273                 /* Get all the members of this channel */
 274                 cl2chan = Channel_FirstMember(chan);
 275                 snprintf(str, sizeof(str), "NJOIN %s :", Channel_Name(chan));
 276                 while (cl2chan) {
 277                         cl = Channel_GetClient(cl2chan);
 278                         assert(cl != NULL);
 279
 280                         /* Nick name, with modes (if applicable) */
 281                         if (str[strlen(str) - 1] != ':')
 282                                 strlcat(str, ",", sizeof(str));
 283                         if (strchr(Channel_UserModes(chan, cl), 'v'))
 284                                 strlcat(str, "+", sizeof(str));
 285                         if (strchr(Channel_UserModes(chan, cl), 'o'))
 286                                 strlcat(str, "@", sizeof(str));
 287                         strlcat(str, Client_ID(cl), sizeof(str));
 288
 289                         /* Send the data if the buffer is "full" */
 290                         if (strlen(str) > (LINE_LEN - CLIENT_NICK_LEN - 8)) {
 291                                 if (!IRC_WriteStrClient(Client, "%s", str))
 292                                         return DISCONNECTED;
 293                                 snprintf(str, sizeof(str), "NJOIN %s :",
 294                                          Channel_Name(chan));
 295                         }
 296
 297                         cl2chan = Channel_NextMember(chan, cl2chan);
 298                 }
 299
 300                 /* Data left in the buffer? */
 301                 if (str[strlen(str) - 1] != ':') {
 302                         /* Yes, send it ... */
 303                         if (!IRC_WriteStrClient(Client, "%s", str))
 304                                 return DISCONNECTED;
 305                 }
 306
 307                 /* Get next channel ... */
 308                 chan = Channel_Next(chan);
 309         }
 310
 311 #ifdef IRCPLUS
 312         if (strchr(Client_Flags(Client), 'L')) {
 313                 LogDebug("Synchronizing INVITE- and BAN-lists ...");
 314                 if (!Synchronize_Lists(Client))
 315                         return DISCONNECTED;
 316         }
 317 #endif
 318
 319         return CONNECTED;
 320 } /* IRC_Num_ENDOFMOTD */
 321
 322
 323 /**
 324  * Handle ISUPPORT (005) numeric.
 325  */
 326 GLOBAL bool
 327 IRC_Num_ISUPPORT(CLIENT * Client, REQUEST * Req)
 328 {
 329         int i;
 330         char *key, *value;
 331
 332         for (i = 1; i < Req->argc - 1; i++) {
 333                 key = Req->argv[i];
 334                 value = strchr(key, '=');
 335                 if (value)
 336                         *value++ = '\0';
 337                 else
 338                         value = "";
 339
 340                 if (strcmp("NICKLEN", key) == 0) {
 341                         if ((unsigned int)atol(value) == Conf_MaxNickLength - 1)
 342                                 continue;
 343
 344                         /* Nick name length settings are different! */
 345                         Log(LOG_ERR,
 346                             "Peer uses incompatible nick name length (%d/%d)! Disconnecting ...",
 347                             Conf_MaxNickLength - 1, atoi(value));
 348                         Conn_Close(Client_Conn(Client),
 349                                    "Incompatible nick name length",
 350                                    NULL, false);
 351                         return DISCONNECTED;
 352                 }
 353         }
 354
 355         return CONNECTED;
 356 } /* IRC_Num_ISUPPORT */
 357
 358
 359 /* -eof- */