671 lines
19 KiB
C
671 lines
19 KiB
C
/*
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* NeoIRCd: NeoStats Group. Based on Hybird7
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* m_server.c: Introduces a server.
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*
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* Copyright (C) 2002 by the past and present ircd coders, and others.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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* $Id: m_server.c,v 1.13 2003/03/06 14:01:48 fishwaldo Exp $
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*/
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#include "stdinc.h"
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#include "tools.h"
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#include "handlers.h" /* m_server prototype */
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#include "client.h" /* client struct */
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#include "common.h" /* TRUE bleah */
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#include "event.h"
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#include "hash.h" /* add_to_client_hash_table */
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#include "irc_string.h"
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#include "ircd.h" /* me */
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#include "list.h" /* make_server */
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#include "numeric.h" /* ERR_xxx */
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#include "s_conf.h" /* struct ConfItem */
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#include "s_log.h" /* log level defines */
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#include "s_serv.h" /* server_estab, check_server, my_name_for_link */
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#include "s_stats.h" /* ServerStats */
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#include "scache.h" /* find_or_add */
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#include "send.h" /* sendto_one */
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#include "motd.h"
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#include "msg.h"
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#include "parse.h"
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#include "modules.h"
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static void mr_server(struct Client*, struct Client*, int, char **);
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static void ms_server(struct Client*, struct Client*, int, char **);
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static int set_server_gecos(struct Client *, char *);
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struct Message server_msgtab = {
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"SERVER", 0, 0, 5, 0, MFLG_SLOW | MFLG_UNREG, 0,
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{mr_server, m_registered, ms_server, m_registered}
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};
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#ifndef STATIC_MODULES
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void
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_modinit(void)
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{
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mod_add_cmd(&server_msgtab);
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}
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void
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_moddeinit(void)
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{
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mod_del_cmd(&server_msgtab);
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}
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const char *_version = "$Revision: 1.13 $";
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#endif
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int bogus_host(char *host);
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struct Client *server_exists(char *);
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/*
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* mr_server - SERVER message handler
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* parv[0] = sender prefix
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* parv[1] = servername
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* parv[2] = hopcount
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* parv[3] = server flags
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* parv[4] = serverinfo
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*/
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static void mr_server(struct Client *client_p, struct Client *source_p,
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int parc, char *parv[])
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{
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char info[REALLEN + 1];
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char *name;
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struct Client *target_p;
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int hop;
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unsigned int srvopt;
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if (parc < 4)
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{
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sendto_one(client_p,"ERROR :No servername");
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exit_client(client_p, client_p, client_p, "Wrong number of args");
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return;
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}
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name = parv[1];
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hop = atoi(parv[2]);
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srvopt = atoi(parv[3]);
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strlcpy(info, parv[4], REALLEN);
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/*
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* Reject a direct nonTS server connection if we're TS_ONLY -orabidoo
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*/
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if (!DoesTS(client_p))
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{
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_ADMIN,"Link %s dropped, non-TS server",
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get_client_name(client_p, HIDE_IP));
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_OPER,"Link %s dropped, non-TS server",
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get_client_name(client_p, MASK_IP));
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exit_client(client_p, client_p, client_p, "Non-TS server");
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return;
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}
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if (bogus_host(name))
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{
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exit_client(client_p, client_p, client_p, "Bogus server name");
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return;
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}
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/* Now we just have to call check_server and everything should be
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* check for us... -A1kmm. */
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switch (check_server(name, client_p, CHECK_SERVER_NOCRYPTLINK))
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{
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case -1:
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if (ConfigFileEntry.warn_no_nline)
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{
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_ADMIN,
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"Unauthorized server connection attempt from %s: No entry for "
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"servername %s", get_client_name(client_p, HIDE_IP), name);
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_OPER,
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"Unauthorized server connection attempt from %s: No entry for "
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"servername %s", get_client_name(client_p, MASK_IP), name);
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}
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exit_client(client_p, client_p, client_p, "Invalid servername.");
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return;
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/* NOT REACHED */
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break;
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case -2:
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_ADMIN,
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"Unauthorized server connection attempt from %s: Bad password "
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"for server %s", get_client_name(client_p, HIDE_IP), name);
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_OPER,
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"Unauthorized server connection attempt from %s: Bad password "
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"for server %s", get_client_name(client_p, MASK_IP), name);
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exit_client(client_p, client_p, client_p, "Invalid password.");
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return;
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/* NOT REACHED */
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break;
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case -3:
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_ADMIN,
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"Unauthorized server connection attempt from %s: Invalid host "
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"for server %s", get_client_name(client_p, HIDE_IP), name);
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_OPER,
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"Unauthorized server connection attempt from %s: Invalid host "
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"for server %s", get_client_name(client_p, MASK_IP), name);
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exit_client(client_p, client_p, client_p, "Invalid host.");
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return;
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/* NOT REACHED */
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break;
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/* servername is > HOSTLEN */
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case -4:
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_ADMIN,
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"Invalid servername %s from %s",
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name, get_client_name(client_p, HIDE_IP));
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_OPER,
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"Invalid servername %s from %s",
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name, get_client_name(client_p, MASK_IP));
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exit_client(client_p, client_p, client_p, "Invalid servername.");
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return;
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/* NOT REACHED */
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break;
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}
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if ((target_p = server_exists(name)))
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{
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/*
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* This link is trying feed me a server that I already have
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* access through another path -- multiple paths not accepted
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* currently, kill this link immediately!!
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*
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* Rather than KILL the link which introduced it, KILL the
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* youngest of the two links. -avalon
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*
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* Definitely don't do that here. This is from an unregistered
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* connect - A1kmm.
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*/
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_ADMIN,
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"Attempt to re-introduce server %s from %s", name,
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get_client_name(client_p, HIDE_IP));
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_OPER,
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"Attempt to re-introduce server %s from %s", name,
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get_client_name(client_p, MASK_IP));
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sendto_one(client_p, "ERROR :Server already exists.");
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exit_client(client_p, client_p, client_p, "Server Exists");
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return;
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}
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if(ServerInfo.hub && IsCapable(client_p, CAP_LL))
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{
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if(IsCapable(client_p, CAP_HUB))
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{
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ClearCap(client_p,CAP_LL);
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_ALL,
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"*** LazyLinks to a hub from a hub, thats a no-no.");
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}
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else
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{
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client_p->localClient->serverMask = nextFreeMask();
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if(!client_p->localClient->serverMask)
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{
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_ALL,
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"serverMask is full!");
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/* try and negotiate a non LL connect */
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ClearCap(client_p,CAP_LL);
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}
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}
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}
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else if (IsCapable(client_p, CAP_LL))
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{
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if(!IsCapable(client_p, CAP_HUB))
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{
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ClearCap(client_p,CAP_LL);
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_ALL,
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"*** LazyLinks to a leaf from a leaf, thats a no-no.");
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}
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}
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/*
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* if we are connecting (Handshake), we already have the name from the
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* C:line in client_p->name
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*/
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strlcpy(client_p->name, name, HOSTLEN+1);
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/* clear the Ulined flag */
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client_p->flags &= ~FLAGS_ULINED;
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if (srvopt & SERVER_HIDDEN) {
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client_p->hidden_server = 1;
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}
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set_server_gecos(client_p, info);
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/* if this server is trying to set itself Ulined, its Not allowed, so exit it */
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if (srvopt & SERVER_ULINED) {
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_ALL, "Server %s trying to U line itself. No Way, Nadda, I dun think so", client_p->name);
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exit_client(client_p, client_p, client_p, "Got a Gline Instead");
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return;
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}
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client_p->hopcount = hop;
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server_estab(client_p);
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}
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/*
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* ms_server - SERVER message handler
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* parv[0] = sender prefix
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* parv[1] = servername
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* parv[2] = hopcount
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* parv[3] = server flags
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* parv[4] = serverinfo
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*/
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static void ms_server(struct Client *client_p, struct Client *source_p,
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int parc, char *parv[])
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{
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char info[REALLEN + 1];
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/* same size as in s_misc.c */
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char* name;
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struct Client* target_p;
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struct Client* bclient_p;
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struct ConfItem* aconf;
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int hop;
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int hlined = 0;
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int llined = 0;
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dlink_node *ptr;
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unsigned int srvopt;
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/* Just to be sure -A1kmm. */
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if (!IsServer(source_p))
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return;
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if (parc < 4)
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{
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sendto_one(client_p,"ERROR :No servername");
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return;
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}
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name = parv[1];
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hop = atoi(parv[2]);
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srvopt = atoi(parv[3]);
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strlcpy(info, parv[4], REALLEN);
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if ((target_p = server_exists(name)))
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{
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/*
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* This link is trying feed me a server that I already have
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* access through another path -- multiple paths not accepted
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* currently, kill this link immediately!!
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*
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* Rather than KILL the link which introduced it, KILL the
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* youngest of the two links. -avalon
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*
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* I think that we should exit the link itself, not the introducer,
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* and we should always exit the most recently received(i.e. the
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* one we are receiving this SERVER for. -A1kmm
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*
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* You *cant* do this, if you link somewhere, it bursts you a server
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* that already exists, then sends you a client burst, you squit the
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* server, but you keep getting the burst of clients on a server that
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* doesnt exist, although ircd can handle it, its not a realistic
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* solution.. --fl_
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*/
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/* It is behind a host-masked server. Completely ignore the
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* server message(don't propagate or we will delink from whoever
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* we propagate to). -A1kmm */
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if (irccmp(target_p->name, name) && target_p->from==client_p)
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return;
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sendto_one(client_p, "ERROR :Server %s already exists", name);
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_ADMIN,
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"Link %s cancelled, server %s already exists",
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get_client_name(client_p, SHOW_IP), name);
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_OPER,
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"Link %s cancelled, server %s already exists",
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client_p->name, name);
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exit_client(client_p, client_p, &me, "Server Exists");
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return;
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}
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/*
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* User nicks never have '.' in them and server names
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* must always have '.' in them.
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*/
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if (strchr(name,'.') == NULL)
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{
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/*
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* Server trying to use the same name as a person. Would
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* cause a fair bit of confusion. Enough to make it hellish
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* for a while and servers to send stuff to the wrong place.
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*/
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sendto_one(client_p,"ERROR :Nickname %s already exists!", name);
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_ADMIN,
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"Link %s cancelled: Server/nick collision on %s",
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/* inpath */ get_client_name(client_p, HIDE_IP), name);
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_OPER,
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"Link %s cancelled: Server/nick collision on %s",
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get_client_name(client_p, MASK_IP), name);
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exit_client(client_p, client_p, client_p, "Nick as Server");
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return;
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}
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/*
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* Server is informing about a new server behind
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* this link. Create REMOTE server structure,
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* add it to list and propagate word to my other
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* server links...
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*/
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if (parc == 1 || info[0] == '\0')
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{
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sendto_one(client_p, "ERROR :No server info specified for %s", name);
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return;
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}
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/*
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* See if the newly found server is behind a guaranteed
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* leaf. If so, close the link.
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*
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*/
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for (aconf = ConfigItemList; aconf; aconf=aconf->next)
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{
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if ((aconf->status & (CONF_LEAF|CONF_HUB)) == 0)
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continue;
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if (match(aconf->name, client_p->name))
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{
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if (aconf->status == CONF_HUB)
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{
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if(match(aconf->host, name))
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hlined++;
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}
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else if (aconf->status == CONF_LEAF)
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{
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if(match(aconf->host, name))
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llined++;
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}
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}
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}
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/* Ok, this way this works is
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*
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* A server can have a CONF_HUB allowing it to introduce servers
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* behind it.
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*
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* connect {
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* name = "irc.bighub.net";
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* hub_mask="*";
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* ...
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*
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* That would allow "irc.bighub.net" to introduce anything it wanted..
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*
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* However
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*
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* connect {
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* name = "irc.somehub.fi";
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* hub_mask="*";
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* leaf_mask="*.edu";
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*...
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* Would allow this server in finland to hub anything but
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* .edu's
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*/
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/* Ok, check client_p can hub the new server, and make sure it's not a LL */
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if (!hlined || (IsCapable(client_p, CAP_LL) && !IsCapable(client_p, CAP_HUB)))
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{
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/* OOOPs nope can't HUB */
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_ADMIN, "Non-Hub link %s introduced %s.",
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get_client_name(client_p, HIDE_IP), name);
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_OPER,
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"Non-Hub link %s introduced %s.",
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get_client_name(client_p, MASK_IP), name);
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exit_client(NULL, source_p, &me, "No matching hub_mask.");
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return;
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}
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/* Check for the new server being leafed behind this HUB */
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if (llined)
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{
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/* OOOPs nope can't HUB this leaf */
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_ADMIN,
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"Link %s introduced leafed server %s.",
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get_client_name(client_p, HIDE_IP), name);
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_OPER,
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"Link %s introduced leafed server %s.",
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client_p->name, name);
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/* If it is new, we are probably misconfigured, so split the
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* non-hub server introducing this. Otherwise, split the new
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* server. -A1kmm.
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*/
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/* wastes too much bandwidth, generates too many errors on
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* larger networks, dont bother. --fl_
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*/
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#if 0
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if ((CurrentTime - source_p->firsttime) < 20)
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{
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exit_client(NULL, source_p, &me, "Leafed Server.");
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return;
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}
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else
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{
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sendto_one(source_p, ":%s SQUIT %s :Sorry, Leafed server.",
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me.name, name);
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return;
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}
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#endif
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exit_client(NULL, client_p, &me, "Leafed Server.");
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return;
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}
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if(strlen(name) > HOSTLEN)
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{
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_ADMIN,
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"Link %s introduced server with invalid servername %s",
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get_client_name(client_p, HIDE_IP), name);
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sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_OPER,
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"Link %s introduced server with invalid servername %s",
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client_p->name, name);
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exit_client(NULL, client_p, &me, "Invalid servername introduced.");
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return;
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}
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target_p = make_client(client_p);
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make_server(target_p);
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target_p->hopcount = hop;
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|
|
|
strlcpy(target_p->name, name, HOSTLEN+1);
|
|
|
|
/* clear the Ulined flag before we look at info for (U) */
|
|
|
|
target_p->flags &= ~FLAGS_ULINED;
|
|
if (srvopt & SERVER_ULINED) target_p->flags |= FLAGS_ULINED;
|
|
if (srvopt & SERVER_HIDDEN) {
|
|
target_p->hidden_server = 1;
|
|
}
|
|
|
|
set_server_gecos(target_p, info);
|
|
|
|
if (IsUlined(target_p)) sendto_realops_flags(FLAGS_ALL, L_ALL, "Link %s introduced a dynamic Ulined server %s", client_p->name, target_p->name);
|
|
|
|
target_p->serv->up = find_or_add(parv[0]);
|
|
target_p->servptr = source_p;
|
|
|
|
SetServer(target_p);
|
|
|
|
Count.server++;
|
|
|
|
add_client_to_list(target_p);
|
|
add_server_to_list(target_p);
|
|
add_to_client_hash_table(target_p->name, target_p);
|
|
add_client_to_llist(&(target_p->servptr->serv->servers), target_p);
|
|
|
|
|
|
/*
|
|
* Old sendto_serv_but_one() call removed because we now
|
|
* need to send different names to different servers
|
|
* (domain name matching)
|
|
*/
|
|
for (ptr = serv_list.head; ptr; ptr = ptr->next)
|
|
{
|
|
bclient_p = ptr->data;
|
|
|
|
if (bclient_p == client_p)
|
|
continue;
|
|
if (!(aconf = bclient_p->serv->sconf))
|
|
{
|
|
sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_ADMIN,
|
|
"Lost N-line for %s on %s. Closing",
|
|
get_client_name(client_p, HIDE_IP), name);
|
|
sendto_realops_flags(FLAGS_ALL|FLAGS_REMOTE, L_OPER,
|
|
"Lost N-line for %s on %s. Closing",
|
|
get_client_name(client_p, MASK_IP), name);
|
|
exit_client(client_p, client_p, client_p, "Lost N line");
|
|
return;
|
|
}
|
|
if (match(my_name_for_link(me.name, aconf), target_p->name))
|
|
continue;
|
|
srvopt = 0;
|
|
if (IsUlined(target_p)) srvopt |= SERVER_ULINED;
|
|
if (target_p->hidden_server) srvopt |= SERVER_HIDDEN;
|
|
sendto_one(bclient_p, ":%s SERVER %s %d %d :%s",
|
|
parv[0], target_p->name, hop + 1,
|
|
srvopt,
|
|
target_p->info);
|
|
}
|
|
|
|
sendto_realops_flags(FLAGS_EXTERNAL, L_ALL,
|
|
"Server %s being introduced by %s",
|
|
target_p->name, source_p->name);
|
|
|
|
}
|
|
|
|
/* set_server_gecos()
|
|
*
|
|
* input - pointer to client
|
|
* output - none
|
|
* side effects - servers gecos field is set
|
|
*/
|
|
static int set_server_gecos(struct Client *client_p, char *info)
|
|
{
|
|
/* check the info for [IP] */
|
|
if(info[0])
|
|
{
|
|
char *p;
|
|
char *s;
|
|
char *t;
|
|
|
|
s = info;
|
|
|
|
/* we should only check the first word for an ip */
|
|
if((p = strchr(s, ' ')))
|
|
*p = '\0';
|
|
|
|
/* check for a ] which would symbolise an [IP] */
|
|
if((t = strchr(s, ']')))
|
|
{
|
|
/* set s to after the first space */
|
|
if(p)
|
|
s = ++p;
|
|
else
|
|
s = NULL;
|
|
}
|
|
/* no ], put the space back */
|
|
else if(p)
|
|
*p = ' ';
|
|
|
|
/* p may have been set to a trailing space, so check s exists and that
|
|
* it isnt \0 */
|
|
if(s && (*s != '\0'))
|
|
{
|
|
|
|
/* if there was a trailing space, s could point to \0, so check */
|
|
if(s && (*s != '\0'))
|
|
strlcpy(client_p->info, s, REALLEN);
|
|
else
|
|
strlcpy(client_p->info, "(Unknown Location)", REALLEN);
|
|
}
|
|
else
|
|
strlcpy(client_p->info, "(Unknown Location)", REALLEN);
|
|
}
|
|
else
|
|
strlcpy(client_p->info, "(Unknown Location)", REALLEN);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* bogus_host
|
|
*
|
|
* inputs - hostname
|
|
* output - 1 if a bogus hostname input, 0 if its valid
|
|
* side effects - none
|
|
*/
|
|
int bogus_host(char *host)
|
|
{
|
|
int bogus_server = 0;
|
|
char *s;
|
|
int dots = 0;
|
|
|
|
for( s = host; *s; s++ )
|
|
{
|
|
if (!IsServChar(*s))
|
|
{
|
|
bogus_server = 1;
|
|
break;
|
|
}
|
|
if ('.' == *s)
|
|
++dots;
|
|
}
|
|
|
|
if (!dots || bogus_server )
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* server_exists()
|
|
*
|
|
* inputs - servername
|
|
* output - 1 if server exists, 0 if doesnt exist
|
|
*/
|
|
struct Client *server_exists(char *servername)
|
|
{
|
|
struct Client *target_p;
|
|
dlink_node *ptr;
|
|
|
|
for(ptr = global_serv_list.head; ptr; ptr = ptr->next)
|
|
{
|
|
target_p = ptr->data;
|
|
|
|
if(match(target_p->name, servername) ||
|
|
match(servername, target_p->name))
|
|
return target_p;
|
|
}
|
|
|
|
return NULL;
|
|
}
|