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