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, 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 && strchr(Channel_UserModes(Chan, cl), 'q'))
  72                                 strlcat(str, "~", sizeof(str));
  73                         if (xop && strchr(Channel_UserModes(Chan, cl), 'a'))
  74                                 strlcat(str, "&", sizeof(str));
  75                         if (strchr(Channel_UserModes(Chan, cl), 'o'))
  76                                 strlcat(str, "@", sizeof(str));
  77                         if (xop && strchr(Channel_UserModes(Chan, cl), 'h'))
  78                                 strlcat(str, "%", sizeof(str));
  79                         if (strchr(Channel_UserModes(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) > (LINE_LEN - 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 /**
 122  * Announce new server in the network
 123  * @param Client New server
 124  * @param Server Existing server in the network
 125  */
 126 static bool
 127 Announce_Server(CLIENT * Client, CLIENT * Server)
 128 {
 129         CLIENT *c;
 130
 131         if (Client_Conn(Server) > NONE) {
 132                 /* Announce the new server to the one already registered
 133                  * which is directly connected to the local server */
 134                 if (!IRC_WriteStrClient
 135                     (Server, "SERVER %s %d %d :%s", Client_ID(Client),
 136                      Client_Hops(Client) + 1, Client_MyToken(Client),
 137                      Client_Info(Client)))
 138                         return DISCONNECTED;
 139         }
 140
 141         if (Client_Hops(Server) == 1)
 142                 c = Client_ThisServer();
 143         else
 144                 c = Client_TopServer(Server);
 145
 146         /* Inform new server about the one already registered in the network */
 147         return IRC_WriteStrClientPrefix(Client, c, "SERVER %s %d %d :%s",
 148                 Client_ID(Server), Client_Hops(Server) + 1,
 149                 Client_MyToken(Server), Client_Info(Server));
 150 } /* Announce_Server */
 151
 152
 153 #ifdef IRCPLUS
 154
 155 /**
 156  * Synchronize invite, ban, G- and K-Line lists between servers.
 157  *
 158  * @param Client New server.
 159  * @return CONNECTED or DISCONNECTED.
 160  */
 161 static bool
 162 Synchronize_Lists(CLIENT * Client)
 163 {
 164         CHANNEL *c;
 165         struct list_head *head;
 166         struct list_elem *elem;
 167
 168         assert(Client != NULL);
 169
 170         /* g-lines */
 171         head = Class_GetList(CLASS_GLINE);
 172         elem = Lists_GetFirst(head);
 173         while (elem) {
 174                 if (!IRC_WriteStrClient(Client, "GLINE %s %ld :%s",
 175                                         Lists_GetMask(elem),
 176                                         Lists_GetValidity(elem) - time(NULL),
 177                                         Lists_GetReason(elem)))
 178                         return DISCONNECTED;
 179                 elem = Lists_GetNext(elem);
 180         }
 181
 182         c = Channel_First();
 183         while (c) {
 184                 /* ban list */
 185                 head = Channel_GetListBans(c);
 186                 elem = Lists_GetFirst(head);
 187                 while (elem) {
 188                         if (!IRC_WriteStrClient(Client, "MODE %s +b %s",
 189                                                 Channel_Name(c),
 190                                                 Lists_GetMask(elem))) {
 191                                 return DISCONNECTED;
 192                         }
 193                         elem = Lists_GetNext(elem);
 194                 }
 195
 196                 /* invite list */
 197                 head = Channel_GetListInvites(c);
 198                 elem = Lists_GetFirst(head);
 199                 while (elem) {
 200                         if (!IRC_WriteStrClient(Client, "MODE %s +I %s",
 201                                                 Channel_Name(c),
 202                                                 Lists_GetMask(elem))) {
 203                                 return DISCONNECTED;
 204                         }
 205                         elem = Lists_GetNext(elem);
 206                 }
 207
 208                 c = Channel_Next(c);
 209         }
 210         return CONNECTED;
 211 }
 212
 213
 214 /**
 215  * Send CHANINFO commands to a new server (inform it about existing channels).
 216  * @param Client New server
 217  * @param Chan Channel
 218  */
 219 static bool
 220 Send_CHANINFO(CLIENT * Client, CHANNEL * Chan)
 221 {
 222         char *modes, *topic;
 223         bool has_k, has_l;
 224
 225 #ifdef DEBUG
 226         Log(LOG_DEBUG, "Sending CHANINFO commands ...");
 227 #endif
 228
 229         modes = Channel_Modes(Chan);
 230         topic = Channel_Topic(Chan);
 231
 232         if (!*modes && !*topic)
 233                 return CONNECTED;
 234
 235         has_k = strchr(modes, 'k') != NULL;
 236         has_l = strchr(modes, 'l') != NULL;
 237
 238         /* send CHANINFO */
 239         if (!has_k && !has_l) {
 240                 if (!*topic) {
 241                         /* "CHANINFO <chan> +<modes>" */
 242                         return IRC_WriteStrClient(Client, "CHANINFO %s +%s",
 243                                                   Channel_Name(Chan), modes);
 244                 }
 245                 /* "CHANINFO <chan> +<modes> :<topic>" */
 246                 return IRC_WriteStrClient(Client, "CHANINFO %s +%s :%s",
 247                                           Channel_Name(Chan), modes, topic);
 248         }
 249         /* "CHANINFO <chan> +<modes> <key> <limit> :<topic>" */
 250         return IRC_WriteStrClient(Client, "CHANINFO %s +%s %s %lu :%s",
 251                                   Channel_Name(Chan), modes,
 252                                   has_k ? Channel_Key(Chan) : "*",
 253                                   has_l ? Channel_MaxUsers(Chan) : 0, topic);
 254 } /* Send_CHANINFO */
 255
 256 #endif /* IRCPLUS */
 257
 258
 259 /**
 260  * Handle ENDOFMOTD (376) numeric and login remote server.
 261  * The peer is either an IRC server (no IRC+ protocol), or we got the
 262  * ENDOFMOTD numeric from an IRC+ server. We have to register the new server.
 263  */
 264 GLOBAL bool
 265 IRC_Num_ENDOFMOTD(CLIENT * Client, UNUSED REQUEST * Req)
 266 {
 267         int max_hops, i;
 268         CLIENT *c;
 269         CHANNEL *chan;
 270
 271         Client_SetType(Client, CLIENT_SERVER);
 272
 273         Log(LOG_NOTICE | LOG_snotice,
 274             "Server \"%s\" registered (connection %d, 1 hop - direct link).",
 275             Client_ID(Client), Client_Conn(Client));
 276
 277         /* Get highest hop count */
 278         max_hops = 0;
 279         c = Client_First();
 280         while (c) {
 281                 if (Client_Hops(c) > max_hops)
 282                         max_hops = Client_Hops(c);
 283                 c = Client_Next(c);
 284         }
 285
 286         /* Inform the new server about all other servers, and announce the
 287          * new server to all the already registered ones. Important: we have
 288          * to do this "in order" and can't introduce servers of which the
 289          * "toplevel server" isn't known already. */
 290         for (i = 0; i < (max_hops + 1); i++) {
 291                 for (c = Client_First(); c != NULL; c = Client_Next(c)) {
 292                         if (Client_Type(c) != CLIENT_SERVER)
 293                                 continue;       /* not a server */
 294                         if (Client_Hops(c) != i)
 295                                 continue;       /* not actual "nesting level" */
 296                         if (c == Client || c == Client_ThisServer())
 297                                 continue;       /* that's us or the peer! */
 298
 299                         if (!Announce_Server(Client, c))
 300                                 return DISCONNECTED;
 301                 }
 302         }
 303
 304         /* Announce all the users to the new server */
 305         c = Client_First();
 306         while (c) {
 307                 if (Client_Type(c) == CLIENT_USER ||
 308                     Client_Type(c) == CLIENT_SERVICE) {
 309                         if (!Client_Announce(Client, Client_ThisServer(), c))
 310                                 return DISCONNECTED;
 311                 }
 312                 c = Client_Next(c);
 313         }
 314
 315         /* Announce all channels to the new server */
 316         chan = Channel_First();
 317         while (chan) {
 318                 if (Channel_IsLocal(chan)) {
 319                         chan = Channel_Next(chan);
 320                         continue;
 321                 }
 322 #ifdef IRCPLUS
 323                 /* Send CHANINFO if the peer supports it */
 324                 if (Client_HasFlag(Client, 'C')) {
 325                         if (!Send_CHANINFO(Client, chan))
 326                                 return DISCONNECTED;
 327                 }
 328 #endif
 329
 330                 if (!Announce_Channel(Client, chan))
 331                         return DISCONNECTED;
 332
 333                 /* Get next channel ... */
 334                 chan = Channel_Next(chan);
 335         }
 336
 337 #ifdef IRCPLUS
 338         if (Client_HasFlag(Client, 'L')) {
 339                 LogDebug("Synchronizing INVITE- and BAN-lists ...");
 340                 if (!Synchronize_Lists(Client))
 341                         return DISCONNECTED;
 342         }
 343 #endif
 344
 345         if (!IRC_WriteStrClient(Client, "PING :%s",
 346             Client_ID(Client_ThisServer())))
 347                 return DISCONNECTED;
 348
 349         return CONNECTED;
 350 } /* IRC_Num_ENDOFMOTD */
 351
 352
 353 /**
 354  * Handle ISUPPORT (005) numeric.
 355  */
 356 GLOBAL bool
 357 IRC_Num_ISUPPORT(CLIENT * Client, REQUEST * Req)
 358 {
 359         int i;
 360         char *key, *value;
 361
 362         for (i = 1; i < Req->argc - 1; i++) {
 363                 key = Req->argv[i];
 364                 value = strchr(key, '=');
 365                 if (value)
 366                         *value++ = '\0';
 367                 else
 368                         value = "";
 369
 370                 if (strcmp("NICKLEN", key) == 0) {
 371                         if ((unsigned int)atol(value) == Conf_MaxNickLength - 1)
 372                                 continue;
 373
 374                         /* Nickname length settings are different! */
 375                         Log(LOG_ERR,
 376                             "Peer uses incompatible nickname length (%d/%d)! Disconnecting ...",
 377                             Conf_MaxNickLength - 1, atoi(value));
 378                         Conn_Close(Client_Conn(Client),
 379                                    "Incompatible nickname length",
 380                                    NULL, false);
 381                         return DISCONNECTED;
 382                 }
 383         }
 384
 385         return CONNECTED;
 386 } /* IRC_Num_ISUPPORT */
 387
 388
 389 /* -eof- */