src/ngircd/numeric.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2014 Alexander Barton (alex@barton.de) and Contributors.
   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 <assert.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <time.h>
  24
  25 #include "conn-func.h"
  26 #include "conf.h"
  27 #include "channel.h"
  28 #include "class.h"
  29 #include "irc-write.h"
  30 #include "lists.h"
  31 #include "log.h"
  32 #include "parse.h"
  33
  34 #include "numeric.h"
  35
  36 /**
  37  * Announce a channel and its users in the network.
  38  */
  39 static bool
  40 Announce_Channel(CLIENT *Client, CHANNEL *Chan)
  41 {
  42         CL2CHAN *cl2chan;
  43         CLIENT *cl;
  44         char str[COMMAND_LEN], *ptr;
  45         bool njoin, xop;
  46
  47         /* Check features of remote server */
  48         njoin = Conn_Options(Client_Conn(Client)) & CONN_RFC1459 ? false : true;
  49         xop = Client_HasFlag(Client, 'X') ? true : false;
  50
  51         /* Get all the members of this channel */
  52         cl2chan = Channel_FirstMember(Chan);
  53         snprintf(str, sizeof(str), "NJOIN %s :", Channel_Name(Chan));
  54         while (cl2chan) {
  55                 cl = Channel_GetClient(cl2chan);
  56                 assert(cl != NULL);
  57
  58                 if (njoin) {
  59                         /* RFC 2813: send NJOIN with nicknames and modes
  60                          * (if user is channel operator or has voice) */
  61                         if (str[strlen(str) - 1] != ':')
  62                                 strlcat(str, ",", sizeof(str));
  63
  64                         /* Prepare user prefix (ChanOp, voiced, ...) */
  65                         if (xop && Channel_UserHasMode(Chan, cl, 'q'))
  66                                 strlcat(str, "~", sizeof(str));
  67                         if (xop && Channel_UserHasMode(Chan, cl, 'a'))
  68                                 strlcat(str, "&", sizeof(str));
  69                         if (Channel_UserHasMode(Chan, cl, 'o'))
  70                                 strlcat(str, "@", sizeof(str));
  71                         if (xop && Channel_UserHasMode(Chan, cl, 'h'))
  72                                 strlcat(str, "%", sizeof(str));
  73                         if (Channel_UserHasMode(Chan, cl, 'v'))
  74                                 strlcat(str, "+", sizeof(str));
  75
  76                         strlcat(str, Client_ID(cl), sizeof(str));
  77
  78                         /* Send the data if the buffer is "full" */
  79                         if (strlen(str) > (sizeof(str) - CLIENT_NICK_LEN - 8)) {
  80                                 if (!IRC_WriteStrClient(Client, "%s", str))
  81                                         return DISCONNECTED;
  82                                 snprintf(str, sizeof(str), "NJOIN %s :",
  83                                          Channel_Name(Chan));
  84                         }
  85                 } else {
  86                         /* RFC 1459: no NJOIN, send JOIN and MODE */
  87                         if (!IRC_WriteStrClientPrefix(Client, cl, "JOIN %s",
  88                                                 Channel_Name(Chan)))
  89                                 return DISCONNECTED;
  90                         ptr = Channel_UserModes(Chan, cl);
  91                         while (*ptr) {
  92                                 if (!IRC_WriteStrClientPrefix(Client, cl,
  93                                                    "MODE %s +%c %s",
  94                                                    Channel_Name(Chan), ptr[0],
  95                                                    Client_ID(cl)))
  96                                         return DISCONNECTED;
  97                                 ptr++;
  98                         }
  99                 }
 100
 101                 cl2chan = Channel_NextMember(Chan, cl2chan);
 102         }
 103
 104         /* Data left in the buffer? */
 105         if (str[strlen(str) - 1] != ':') {
 106                 /* Yes, send it ... */
 107                 if (!IRC_WriteStrClient(Client, "%s", str))
 108                         return DISCONNECTED;
 109         }
 110
 111         return CONNECTED;
 112 } /* Announce_Channel */
 113
 114 /**
 115  * Announce new server in the network
 116  * @param Client New server
 117  * @param Server Existing server in the network
 118  */
 119 static bool
 120 Announce_Server(CLIENT * Client, CLIENT * Server)
 121 {
 122         CLIENT *c;
 123
 124         if (Client_Conn(Server) > NONE) {
 125                 /* Announce the new server to the one already registered
 126                  * which is directly connected to the local server */
 127                 if (!IRC_WriteStrClient
 128                     (Server, "SERVER %s %d %d :%s", Client_ID(Client),
 129                      Client_Hops(Client) + 1, Client_MyToken(Client),
 130                      Client_Info(Client)))
 131                         return DISCONNECTED;
 132         }
 133
 134         if (Client_Hops(Server) == 1)
 135                 c = Client_ThisServer();
 136         else
 137                 c = Client_TopServer(Server);
 138
 139         /* Inform new server about the one already registered in the network */
 140         return IRC_WriteStrClientPrefix(Client, c, "SERVER %s %d %d :%s",
 141                 Client_ID(Server), Client_Hops(Server) + 1,
 142                 Client_MyToken(Server), Client_Info(Server));
 143 } /* Announce_Server */
 144
 145 #ifdef IRCPLUS
 146
 147 /**
 148  * Synchronize invite, ban, G- and K-Line lists between servers.
 149  *
 150  * @param Client New server.
 151  * @return CONNECTED or DISCONNECTED.
 152  */
 153 static bool
 154 Synchronize_Lists(CLIENT * Client)
 155 {
 156         CHANNEL *c;
 157         struct list_head *head;
 158         struct list_elem *elem;
 159
 160         assert(Client != NULL);
 161
 162         /* g-lines */
 163         head = Class_GetList(CLASS_GLINE);
 164         elem = Lists_GetFirst(head);
 165         while (elem) {
 166                 if (!IRC_WriteStrClient(Client, "GLINE %s %ld :%s",
 167                                         Lists_GetMask(elem),
 168                                         Lists_GetValidity(elem) - time(NULL),
 169                                         Lists_GetReason(elem)))
 170                         return DISCONNECTED;
 171                 elem = Lists_GetNext(elem);
 172         }
 173
 174         c = Channel_First();
 175         while (c) {
 176                 /* ban list */
 177                 head = Channel_GetListBans(c);
 178                 elem = Lists_GetFirst(head);
 179                 while (elem) {
 180                         if (!IRC_WriteStrClient(Client, "MODE %s +b %s",
 181                                                 Channel_Name(c),
 182                                                 Lists_GetMask(elem))) {
 183                                 return DISCONNECTED;
 184                         }
 185                         elem = Lists_GetNext(elem);
 186                 }
 187
 188                 /* invite list */
 189                 head = Channel_GetListInvites(c);
 190                 elem = Lists_GetFirst(head);
 191                 while (elem) {
 192                         if (!IRC_WriteStrClient(Client, "MODE %s +I %s",
 193                                                 Channel_Name(c),
 194                                                 Lists_GetMask(elem))) {
 195                                 return DISCONNECTED;
 196                         }
 197                         elem = Lists_GetNext(elem);
 198                 }
 199
 200                 c = Channel_Next(c);
 201         }
 202         return CONNECTED;
 203 }
 204
 205 /**
 206  * Send CHANINFO commands to a new server (inform it about existing channels).
 207  * @param Client New server
 208  * @param Chan Channel
 209  */
 210 static bool
 211 Send_CHANINFO(CLIENT * Client, CHANNEL * Chan)
 212 {
 213         char *modes, *topic;
 214         bool has_k, has_l;
 215
 216 #ifdef DEBUG
 217         Log(LOG_DEBUG, "Sending CHANINFO commands ...");
 218 #endif
 219
 220         modes = Channel_Modes(Chan);
 221         topic = Channel_Topic(Chan);
 222
 223         if (!*modes && !*topic)
 224                 return CONNECTED;
 225
 226         has_k = Channel_HasMode(Chan, 'k');
 227         has_l = Channel_HasMode(Chan, 'l');
 228
 229         /* send CHANINFO */
 230         if (!has_k && !has_l) {
 231                 if (!*topic) {
 232                         /* "CHANINFO <chan> +<modes>" */
 233                         return IRC_WriteStrClient(Client, "CHANINFO %s +%s",
 234                                                   Channel_Name(Chan), modes);
 235                 }
 236                 /* "CHANINFO <chan> +<modes> :<topic>" */
 237                 return IRC_WriteStrClient(Client, "CHANINFO %s +%s :%s",
 238                                           Channel_Name(Chan), modes, topic);
 239         }
 240         /* "CHANINFO <chan> +<modes> <key> <limit> :<topic>" */
 241         return IRC_WriteStrClient(Client, "CHANINFO %s +%s %s %lu :%s",
 242                                   Channel_Name(Chan), modes,
 243                                   has_k ? Channel_Key(Chan) : "*",
 244                                   has_l ? Channel_MaxUsers(Chan) : 0, topic);
 245 } /* Send_CHANINFO */
 246
 247 #endif /* IRCPLUS */
 248
 249 /**
 250  * Handle ENDOFMOTD (376) numeric and login remote server.
 251  * The peer is either an IRC server (no IRC+ protocol), or we got the
 252  * ENDOFMOTD numeric from an IRC+ server. We have to register the new server.
 253  */
 254 GLOBAL bool
 255 IRC_Num_ENDOFMOTD(CLIENT * Client, UNUSED REQUEST * Req)
 256 {
 257         int max_hops, i;
 258         CLIENT *c;
 259         CHANNEL *chan;
 260
 261         Client_SetType(Client, CLIENT_SERVER);
 262
 263         Log(LOG_NOTICE | LOG_snotice,
 264             "Server \"%s\" registered (connection %d, 1 hop - direct link).",
 265             Client_ID(Client), Client_Conn(Client));
 266
 267         /* Get highest hop count */
 268         max_hops = 0;
 269         c = Client_First();
 270         while (c) {
 271                 if (Client_Hops(c) > max_hops)
 272                         max_hops = Client_Hops(c);
 273                 c = Client_Next(c);
 274         }
 275
 276         /* Inform the new server about all other servers, and announce the
 277          * new server to all the already registered ones. Important: we have
 278          * to do this "in order" and can't introduce servers of which the
 279          * "toplevel server" isn't known already. */
 280         for (i = 0; i < (max_hops + 1); i++) {
 281                 for (c = Client_First(); c != NULL; c = Client_Next(c)) {
 282                         if (Client_Type(c) != CLIENT_SERVER)
 283                                 continue;       /* not a server */
 284                         if (Client_Hops(c) != i)
 285                                 continue;       /* not actual "nesting level" */
 286                         if (c == Client || c == Client_ThisServer())
 287                                 continue;       /* that's us or the peer! */
 288
 289                         if (!Announce_Server(Client, c))
 290                                 return DISCONNECTED;
 291                 }
 292         }
 293
 294         /* Announce all the users to the new server */
 295         c = Client_First();
 296         while (c) {
 297                 if (Client_Type(c) == CLIENT_USER ||
 298                     Client_Type(c) == CLIENT_SERVICE) {
 299                         if (!Client_Announce(Client, Client_ThisServer(), c))
 300                                 return DISCONNECTED;
 301                 }
 302                 c = Client_Next(c);
 303         }
 304
 305         /* Announce all channels to the new server */
 306         chan = Channel_First();
 307         while (chan) {
 308                 if (Channel_IsLocal(chan)) {
 309                         chan = Channel_Next(chan);
 310                         continue;
 311                 }
 312 #ifdef IRCPLUS
 313                 /* Send CHANINFO if the peer supports it */
 314                 if (Client_HasFlag(Client, 'C')) {
 315                         if (!Send_CHANINFO(Client, chan))
 316                                 return DISCONNECTED;
 317                 }
 318 #endif
 319
 320                 if (!Announce_Channel(Client, chan))
 321                         return DISCONNECTED;
 322
 323                 /* Get next channel ... */
 324                 chan = Channel_Next(chan);
 325         }
 326
 327 #ifdef IRCPLUS
 328         if (Client_HasFlag(Client, 'L')) {
 329                 LogDebug("Synchronizing INVITE- and BAN-lists ...");
 330                 if (!Synchronize_Lists(Client))
 331                         return DISCONNECTED;
 332         }
 333 #endif
 334
 335         if (!IRC_WriteStrClient(Client, "PING :%s",
 336             Client_ID(Client_ThisServer())))
 337                 return DISCONNECTED;
 338
 339         return CONNECTED;
 340 } /* IRC_Num_ENDOFMOTD */
 341
 342 /**
 343  * Handle ISUPPORT (005) numeric.
 344  */
 345 GLOBAL bool
 346 IRC_Num_ISUPPORT(CLIENT * Client, REQUEST * Req)
 347 {
 348         int i;
 349         char *key, *value;
 350
 351         for (i = 1; i < Req->argc - 1; i++) {
 352                 key = Req->argv[i];
 353                 value = strchr(key, '=');
 354                 if (value)
 355                         *value++ = '\0';
 356                 else
 357                         value = "";
 358
 359                 if (strcmp("NICKLEN", key) == 0) {
 360                         if ((unsigned int)atol(value) == Conf_MaxNickLength - 1)
 361                                 continue;
 362
 363                         /* Nickname length settings are different! */
 364                         Log(LOG_ERR,
 365                             "Peer uses incompatible nickname length (%d/%d)! Disconnecting ...",
 366                             Conf_MaxNickLength - 1, atoi(value));
 367                         Conn_Close(Client_Conn(Client),
 368                                    "Incompatible nickname length",
 369                                    NULL, false);
 370                         return DISCONNECTED;
 371                 }
 372         }
 373
 374         return CONNECTED;
 375 } /* IRC_Num_ISUPPORT */
 376
 377 /* -eof- */