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[COMMAND_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 = Client_HasFlag(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 && Channel_UserHasMode(Chan, cl, 'q'))
  72                                 strlcat(str, "~", sizeof(str));
  73                         if (xop && Channel_UserHasMode(Chan, cl, 'a'))
  74                                 strlcat(str, "&", sizeof(str));
  75                         if (Channel_UserHasMode(Chan, cl, 'o'))
  76                                 strlcat(str, "@", sizeof(str));
  77                         if (xop && Channel_UserHasMode(Chan, cl, 'h'))
  78                                 strlcat(str, "%", sizeof(str));
  79                         if (Channel_UserHasMode(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) > (sizeof(str) - 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  * 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 #ifdef IRCPLUS
 152
 153 /**
 154  * Synchronize invite, ban, G- and K-Line lists between servers.
 155  *
 156  * @param Client New server.
 157  * @return CONNECTED or DISCONNECTED.
 158  */
 159 static bool
 160 Synchronize_Lists(CLIENT * Client)
 161 {
 162         CHANNEL *c;
 163         struct list_head *head;
 164         struct list_elem *elem;
 165
 166         assert(Client != NULL);
 167
 168         /* g-lines */
 169         head = Class_GetList(CLASS_GLINE);
 170         elem = Lists_GetFirst(head);
 171         while (elem) {
 172                 if (!IRC_WriteStrClient(Client, "GLINE %s %ld :%s",
 173                                         Lists_GetMask(elem),
 174                                         Lists_GetValidity(elem) - time(NULL),
 175                                         Lists_GetReason(elem)))
 176                         return DISCONNECTED;
 177                 elem = Lists_GetNext(elem);
 178         }
 179
 180         c = Channel_First();
 181         while (c) {
 182                 /* ban list */
 183                 head = Channel_GetListBans(c);
 184                 elem = Lists_GetFirst(head);
 185                 while (elem) {
 186                         if (!IRC_WriteStrClient(Client, "MODE %s +b %s",
 187                                                 Channel_Name(c),
 188                                                 Lists_GetMask(elem))) {
 189                                 return DISCONNECTED;
 190                         }
 191                         elem = Lists_GetNext(elem);
 192                 }
 193
 194                 /* invite list */
 195                 head = Channel_GetListInvites(c);
 196                 elem = Lists_GetFirst(head);
 197                 while (elem) {
 198                         if (!IRC_WriteStrClient(Client, "MODE %s +I %s",
 199                                                 Channel_Name(c),
 200                                                 Lists_GetMask(elem))) {
 201                                 return DISCONNECTED;
 202                         }
 203                         elem = Lists_GetNext(elem);
 204                 }
 205
 206                 c = Channel_Next(c);
 207         }
 208         return CONNECTED;
 209 }
 210
 211 /**
 212  * Send CHANINFO commands to a new server (inform it about existing channels).
 213  * @param Client New server
 214  * @param Chan Channel
 215  */
 216 static bool
 217 Send_CHANINFO(CLIENT * Client, CHANNEL * Chan)
 218 {
 219         char *modes, *topic;
 220         bool has_k, has_l;
 221
 222 #ifdef DEBUG
 223         Log(LOG_DEBUG, "Sending CHANINFO commands ...");
 224 #endif
 225
 226         modes = Channel_Modes(Chan);
 227         topic = Channel_Topic(Chan);
 228
 229         if (!*modes && !*topic)
 230                 return CONNECTED;
 231
 232         has_k = Channel_HasMode(Chan, 'k');
 233         has_l = Channel_HasMode(Chan, 'l');
 234
 235         /* send CHANINFO */
 236         if (!has_k && !has_l) {
 237                 if (!*topic) {
 238                         /* "CHANINFO <chan> +<modes>" */
 239                         return IRC_WriteStrClient(Client, "CHANINFO %s +%s",
 240                                                   Channel_Name(Chan), modes);
 241                 }
 242                 /* "CHANINFO <chan> +<modes> :<topic>" */
 243                 return IRC_WriteStrClient(Client, "CHANINFO %s +%s :%s",
 244                                           Channel_Name(Chan), modes, topic);
 245         }
 246         /* "CHANINFO <chan> +<modes> <key> <limit> :<topic>" */
 247         return IRC_WriteStrClient(Client, "CHANINFO %s +%s %s %lu :%s",
 248                                   Channel_Name(Chan), modes,
 249                                   has_k ? Channel_Key(Chan) : "*",
 250                                   has_l ? Channel_MaxUsers(Chan) : 0, topic);
 251 } /* Send_CHANINFO */
 252
 253 #endif /* IRCPLUS */
 254
 255 /**
 256  * Handle ENDOFMOTD (376) numeric and login remote server.
 257  * The peer is either an IRC server (no IRC+ protocol), or we got the
 258  * ENDOFMOTD numeric from an IRC+ server. We have to register the new server.
 259  */
 260 GLOBAL bool
 261 IRC_Num_ENDOFMOTD(CLIENT * Client, UNUSED REQUEST * Req)
 262 {
 263         int max_hops, i;
 264         CLIENT *c;
 265         CHANNEL *chan;
 266
 267         Client_SetType(Client, CLIENT_SERVER);
 268
 269         Log(LOG_NOTICE | LOG_snotice,
 270             "Server \"%s\" registered (connection %d, 1 hop - direct link).",
 271             Client_ID(Client), Client_Conn(Client));
 272
 273         /* Get highest hop count */
 274         max_hops = 0;
 275         c = Client_First();
 276         while (c) {
 277                 if (Client_Hops(c) > max_hops)
 278                         max_hops = Client_Hops(c);
 279                 c = Client_Next(c);
 280         }
 281
 282         /* Inform the new server about all other servers, and announce the
 283          * new server to all the already registered ones. Important: we have
 284          * to do this "in order" and can't introduce servers of which the
 285          * "toplevel server" isn't known already. */
 286         for (i = 0; i < (max_hops + 1); i++) {
 287                 for (c = Client_First(); c != NULL; c = Client_Next(c)) {
 288                         if (Client_Type(c) != CLIENT_SERVER)
 289                                 continue;       /* not a server */
 290                         if (Client_Hops(c) != i)
 291                                 continue;       /* not actual "nesting level" */
 292                         if (c == Client || c == Client_ThisServer())
 293                                 continue;       /* that's us or the peer! */
 294
 295                         if (!Announce_Server(Client, c))
 296                                 return DISCONNECTED;
 297                 }
 298         }
 299
 300         /* Announce all the users to the new server */
 301         c = Client_First();
 302         while (c) {
 303                 if (Client_Type(c) == CLIENT_USER ||
 304                     Client_Type(c) == CLIENT_SERVICE) {
 305                         if (!Client_Announce(Client, Client_ThisServer(), c))
 306                                 return DISCONNECTED;
 307                 }
 308                 c = Client_Next(c);
 309         }
 310
 311         /* Announce all channels to the new server */
 312         chan = Channel_First();
 313         while (chan) {
 314                 if (Channel_IsLocal(chan)) {
 315                         chan = Channel_Next(chan);
 316                         continue;
 317                 }
 318 #ifdef IRCPLUS
 319                 /* Send CHANINFO if the peer supports it */
 320                 if (Client_HasFlag(Client, 'C')) {
 321                         if (!Send_CHANINFO(Client, chan))
 322                                 return DISCONNECTED;
 323                 }
 324 #endif
 325
 326                 if (!Announce_Channel(Client, chan))
 327                         return DISCONNECTED;
 328
 329                 /* Get next channel ... */
 330                 chan = Channel_Next(chan);
 331         }
 332
 333 #ifdef IRCPLUS
 334         if (Client_HasFlag(Client, 'L')) {
 335                 LogDebug("Synchronizing INVITE- and BAN-lists ...");
 336                 if (!Synchronize_Lists(Client))
 337                         return DISCONNECTED;
 338         }
 339 #endif
 340
 341         if (!IRC_WriteStrClient(Client, "PING :%s",
 342             Client_ID(Client_ThisServer())))
 343                 return DISCONNECTED;
 344
 345         return CONNECTED;
 346 } /* IRC_Num_ENDOFMOTD */
 347
 348 /**
 349  * Handle ISUPPORT (005) numeric.
 350  */
 351 GLOBAL bool
 352 IRC_Num_ISUPPORT(CLIENT * Client, REQUEST * Req)
 353 {
 354         int i;
 355         char *key, *value;
 356
 357         for (i = 1; i < Req->argc - 1; i++) {
 358                 key = Req->argv[i];
 359                 value = strchr(key, '=');
 360                 if (value)
 361                         *value++ = '\0';
 362                 else
 363                         value = "";
 364
 365                 if (strcmp("NICKLEN", key) == 0) {
 366                         if ((unsigned int)atol(value) == Conf_MaxNickLength - 1)
 367                                 continue;
 368
 369                         /* Nickname length settings are different! */
 370                         Log(LOG_ERR,
 371                             "Peer uses incompatible nickname length (%d/%d)! Disconnecting ...",
 372                             Conf_MaxNickLength - 1, atoi(value));
 373                         Conn_Close(Client_Conn(Client),
 374                                    "Incompatible nickname length",
 375                                    NULL, false);
 376                         return DISCONNECTED;
 377                 }
 378         }
 379
 380         return CONNECTED;
 381 } /* IRC_Num_ISUPPORT */
 382
 383 /* -eof- */