8e34ffc66e
Note that this is checked after duplicate server names, so it can only happen if multiple servers have the same SID configured.
718 lines
20 KiB
C
718 lines
20 KiB
C
/*
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* ircd-ratbox: A slightly useful ircd.
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* m_server.c: Introduces a server.
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*
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* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
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* Copyright (C) 1996-2002 Hybrid Development Team
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* Copyright (C) 2002-2005 ircd-ratbox development team
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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 3291 2007-03-28 14:30:10Z jilles $
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*/
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#include "stdinc.h"
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#include "client.h" /* client struct */
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#include "common.h" /* TRUE bleah */
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#include "hash.h" /* add_to_client_hash */
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#include "match.h"
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#include "ircd.h" /* me */
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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_newconf.h"
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#include "logger.h" /* log level defines */
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#include "s_serv.h" /* server_estab, check_server */
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#include "s_stats.h" /* ServerStats */
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#include "scache.h"
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#include "send.h" /* sendto_one */
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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 int mr_server(struct Client *, struct Client *, int, const char **);
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static int ms_server(struct Client *, struct Client *, int, const char **);
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static int ms_sid(struct Client *, struct Client *, int, const char **);
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struct Message server_msgtab = {
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"SERVER", 0, 0, 0, MFLG_SLOW | MFLG_UNREG,
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{{mr_server, 4}, mg_reg, mg_ignore, {ms_server, 4}, mg_ignore, mg_reg}
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};
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struct Message sid_msgtab = {
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"SID", 0, 0, 0, MFLG_SLOW,
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{mg_ignore, mg_reg, mg_ignore, {ms_sid, 5}, mg_ignore, mg_reg}
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};
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mapi_clist_av1 server_clist[] = { &server_msgtab, &sid_msgtab, NULL };
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DECLARE_MODULE_AV1(server, NULL, NULL, server_clist, NULL, NULL, "$Revision: 3291 $");
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int bogus_host(const char *host);
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static int set_server_gecos(struct Client *, const 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] = serverinfo/hopcount
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* parv[3] = serverinfo
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*/
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static int
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mr_server(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
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{
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char info[REALLEN + 1];
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const char *name;
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struct Client *target_p;
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int hop;
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name = parv[1];
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hop = atoi(parv[2]);
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rb_strlcpy(info, parv[3], sizeof(info));
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if (IsHandshake(client_p) && irccmp(client_p->name, name))
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{
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sendto_realops_snomask(SNO_GENERAL, is_remote_connect(client_p) ? L_NETWIDE : L_ALL,
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"Server %s has unexpected name %s",
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client_p->name, name);
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ilog(L_SERVER, "Server %s has unexpected name %s",
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log_client_name(client_p, SHOW_IP), name);
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exit_client(client_p, client_p, client_p, "Server name mismatch");
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return 0;
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}
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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_snomask(SNO_GENERAL, L_ALL, "Link %s dropped, non-TS server",
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client_p->name);
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exit_client(client_p, client_p, client_p, "Non-TS server");
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return 0;
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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 0;
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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))
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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_snomask(SNO_GENERAL, L_ALL,
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"Unauthorised server connection attempt from %s: "
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"No entry for servername %s",
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client_p->name, name);
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ilog(L_SERVER, "Access denied, no connect block for server %s%s",
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EmptyString(client_p->name) ? name : "",
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log_client_name(client_p, SHOW_IP));
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}
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exit_client(client_p, client_p, client_p, "Invalid servername.");
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return 0;
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/* NOT REACHED */
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break;
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case -2:
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sendto_realops_snomask(SNO_GENERAL, is_remote_connect(client_p) ? L_NETWIDE : L_ALL,
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"Unauthorised server connection attempt from %s: "
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"Bad password for server %s",
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client_p->name, name);
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ilog(L_SERVER, "Access denied, invalid password for server %s%s",
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EmptyString(client_p->name) ? name : "",
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log_client_name(client_p, SHOW_IP));
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exit_client(client_p, client_p, client_p, "Invalid password.");
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return 0;
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/* NOT REACHED */
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break;
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case -3:
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Unauthorised server connection attempt from %s: "
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"Invalid host for server %s",
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client_p->name, name);
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ilog(L_SERVER, "Access denied, invalid host for server %s%s",
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EmptyString(client_p->name) ? name : "",
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log_client_name(client_p, SHOW_IP));
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exit_client(client_p, client_p, client_p, "Invalid host.");
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return 0;
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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_snomask(SNO_GENERAL, L_ALL,
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"Invalid servername %s from %s",
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name, client_p->name);
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ilog(L_SERVER, "Access denied, invalid servername from %s",
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log_client_name(client_p, SHOW_IP));
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exit_client(client_p, client_p, client_p, "Invalid servername.");
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return 0;
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/* NOT REACHED */
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break;
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case -5:
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Connection from servername %s requires SSL/TLS but is plaintext",
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name);
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ilog(L_SERVER, "Access denied, requires SSL/TLS but is plaintext from %s",
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log_client_name(client_p, SHOW_IP));
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exit_client(client_p, client_p, client_p, "Access denied, requires SSL/TLS but is plaintext");
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return 0;
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}
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/* require TS6 for direct links */
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if(!IsCapable(client_p, CAP_TS6))
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{
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sendto_realops_snomask(SNO_GENERAL, is_remote_connect(client_p) ? L_NETWIDE : L_ALL,
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"Link %s dropped, TS6 protocol is required", name);
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exit_client(client_p, client_p, client_p, "Incompatible TS version");
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return 0;
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}
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if((target_p = find_server(NULL, 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_snomask(SNO_GENERAL, L_ALL,
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"Attempt to re-introduce server %s from %s",
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name, client_p->name);
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ilog(L_SERVER, "Attempt to re-introduce server %s from %s",
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name, log_client_name(client_p, SHOW_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 0;
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}
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if(has_id(client_p) && (target_p = find_id(client_p->id)) != NULL)
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{
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sendto_realops_snomask(SNO_GENERAL, is_remote_connect(client_p) ? L_NETWIDE : L_ALL,
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"Attempt to re-introduce SID %s from %s%s (already in use by %s)",
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client_p->id,
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EmptyString(client_p->name) ? name : "",
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client_p->name, target_p->name);
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ilog(L_SERVER, "Attempt to re-introduce SID %s from %s%s (already in use by %s)",
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client_p->id,
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EmptyString(client_p->name) ? name : "",
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log_client_name(client_p, SHOW_IP),
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target_p->name);
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sendto_one(client_p, "ERROR :SID already exists.");
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exit_client(client_p, client_p, client_p, "SID Exists");
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return 0;
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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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rb_strlcpy(client_p->name, name, sizeof(client_p->name));
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set_server_gecos(client_p, info);
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client_p->hopcount = hop;
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server_estab(client_p);
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return 0;
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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] = serverinfo/hopcount
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* parv[3] = serverinfo
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*/
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static int
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ms_server(struct Client *client_p, struct Client *source_p, int parc, const 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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const char *name;
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struct Client *target_p;
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struct remote_conf *hub_p;
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hook_data_client hdata;
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int hop;
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int hlined = 0;
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int llined = 0;
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rb_dlink_node *ptr;
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name = parv[1];
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hop = atoi(parv[2]);
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rb_strlcpy(info, parv[3], sizeof(info));
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if((target_p = find_server(NULL, 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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sendto_one(client_p, "ERROR :Server %s already exists", name);
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Link %s cancelled, server %s already exists",
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client_p->name, name);
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ilog(L_SERVER, "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 0;
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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_snomask(SNO_GENERAL, L_ALL,
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"Link %s cancelled: Server/nick collision on %s",
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client_p->name, name);
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ilog(L_SERVER, "Link %s cancelled: Server/nick collision on %s",
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client_p->name, name);
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exit_client(client_p, client_p, client_p, "Nick as Server");
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return 0;
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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 || EmptyString(info))
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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 0;
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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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RB_DLINK_FOREACH(ptr, hubleaf_conf_list.head)
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{
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hub_p = ptr->data;
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if(match(hub_p->server, client_p->name) && match(hub_p->host, name))
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{
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if(hub_p->flags & CONF_HUB)
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hlined++;
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else
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llined++;
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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)
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{
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/* OOOPs nope can't HUB */
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sendto_realops_snomask(SNO_GENERAL, L_ALL, "Non-Hub link %s introduced %s.",
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client_p->name, name);
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ilog(L_SERVER, "Non-Hub link %s introduced %s.",
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client_p->name, name);
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exit_client(NULL, client_p, &me, "No matching hub_mask.");
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return 0;
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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_snomask(SNO_GENERAL, L_ALL,
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"Link %s introduced leafed server %s.",
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client_p->name, name);
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ilog(L_SERVER, "Link %s introduced leafed server %s.",
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client_p->name, name);
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exit_client(NULL, client_p, &me, "Leafed Server.");
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return 0;
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}
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if(strlen(name) > HOSTLEN)
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{
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Link %s introduced server with invalid servername %s",
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client_p->name, name);
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ilog(L_SERVER, "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 0;
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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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rb_strlcpy(target_p->name, name, sizeof(target_p->name));
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set_server_gecos(target_p, info);
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target_p->servptr = source_p;
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SetServer(target_p);
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rb_dlinkAddTail(target_p, &target_p->node, &global_client_list);
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rb_dlinkAddTailAlloc(target_p, &global_serv_list);
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add_to_client_hash(target_p->name, target_p);
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rb_dlinkAdd(target_p, &target_p->lnode, &target_p->servptr->serv->servers);
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target_p->serv->nameinfo = scache_connect(target_p->name, target_p->info, IsHidden(target_p));
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sendto_server(client_p, NULL, NOCAPS, NOCAPS,
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":%s SERVER %s %d :%s%s",
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source_p->name, target_p->name, target_p->hopcount + 1,
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IsHidden(target_p) ? "(H) " : "", target_p->info);
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sendto_realops_snomask(SNO_EXTERNAL, L_ALL,
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"Server %s being introduced by %s", target_p->name, source_p->name);
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/* quick, dirty EOB. you know you love it. */
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sendto_one(target_p, ":%s PING %s %s", get_id(&me, target_p), me.name, target_p->name);
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hdata.client = source_p;
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hdata.target = target_p;
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call_hook(h_server_introduced, &hdata);
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return 0;
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}
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static int
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ms_sid(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
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{
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struct Client *target_p;
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struct remote_conf *hub_p;
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hook_data_client hdata;
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rb_dlink_node *ptr;
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int hop;
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int hlined = 0;
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int llined = 0;
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char squitreason[160];
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hop = atoi(parv[2]);
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/* collision on the name? */
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if((target_p = find_server(NULL, parv[1])) != NULL)
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{
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sendto_one(client_p, "ERROR :Server %s already exists", parv[1]);
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Link %s cancelled, server %s already exists",
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client_p->name, parv[1]);
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ilog(L_SERVER, "Link %s cancelled, server %s already exists",
|
|
client_p->name, parv[1]);
|
|
|
|
exit_client(NULL, client_p, &me, "Server Exists");
|
|
return 0;
|
|
}
|
|
|
|
/* collision on the SID? */
|
|
if((target_p = find_id(parv[3])) != NULL)
|
|
{
|
|
sendto_wallops_flags(UMODE_WALLOP, &me,
|
|
"Link %s cancelled, SID %s for server %s already in use by %s",
|
|
client_p->name, parv[3], parv[1], target_p->name);
|
|
sendto_server(NULL, NULL, CAP_TS6, NOCAPS,
|
|
":%s WALLOPS :Link %s cancelled, SID %s for server %s already in use by %s",
|
|
me.id, client_p->name, parv[3], parv[1], target_p->name);
|
|
ilog(L_SERVER, "Link %s cancelled, SID %s for server %s already in use by %s",
|
|
client_p->name, parv[3], parv[1], target_p->name);
|
|
|
|
snprintf(squitreason, sizeof squitreason,
|
|
"SID %s for %s already in use by %s",
|
|
parv[3], parv[1], target_p->name);
|
|
exit_client(NULL, client_p, &me, squitreason);
|
|
return 0;
|
|
}
|
|
|
|
if(bogus_host(parv[1]) || strlen(parv[1]) > HOSTLEN)
|
|
{
|
|
sendto_one(client_p, "ERROR :Invalid servername");
|
|
sendto_realops_snomask(SNO_GENERAL, L_ALL,
|
|
"Link %s cancelled, servername %s invalid",
|
|
client_p->name, parv[1]);
|
|
ilog(L_SERVER, "Link %s cancelled, servername %s invalid",
|
|
client_p->name, parv[1]);
|
|
|
|
exit_client(NULL, client_p, &me, "Bogus server name");
|
|
return 0;
|
|
}
|
|
|
|
if(!IsDigit(parv[3][0]) || !IsIdChar(parv[3][1]) ||
|
|
!IsIdChar(parv[3][2]) || parv[3][3] != '\0')
|
|
{
|
|
sendto_one(client_p, "ERROR :Invalid SID");
|
|
sendto_realops_snomask(SNO_GENERAL, L_ALL,
|
|
"Link %s cancelled, SID %s invalid",
|
|
client_p->name, parv[3]);
|
|
ilog(L_SERVER, "Link %s cancelled, SID %s invalid",
|
|
client_p->name, parv[3]);
|
|
|
|
exit_client(NULL, client_p, &me, "Bogus SID");
|
|
return 0;
|
|
}
|
|
|
|
/* for the directly connected server:
|
|
* H: allows it to introduce a server matching that mask
|
|
* L: disallows it introducing a server matching that mask
|
|
*/
|
|
RB_DLINK_FOREACH(ptr, hubleaf_conf_list.head)
|
|
{
|
|
hub_p = ptr->data;
|
|
|
|
if(match(hub_p->server, client_p->name) && match(hub_p->host, parv[1]))
|
|
{
|
|
if(hub_p->flags & CONF_HUB)
|
|
hlined++;
|
|
else
|
|
llined++;
|
|
}
|
|
}
|
|
|
|
/* no matching hub_mask */
|
|
if(!hlined)
|
|
{
|
|
sendto_one(client_p, "ERROR :No matching hub_mask");
|
|
sendto_realops_snomask(SNO_GENERAL, L_ALL,
|
|
"Non-Hub link %s introduced %s.",
|
|
client_p->name, parv[1]);
|
|
ilog(L_SERVER, "Non-Hub link %s introduced %s.",
|
|
client_p->name, parv[1]);
|
|
exit_client(NULL, client_p, &me, "No matching hub_mask.");
|
|
return 0;
|
|
}
|
|
|
|
/* matching leaf_mask */
|
|
if(llined)
|
|
{
|
|
sendto_one(client_p, "ERROR :Matching leaf_mask");
|
|
sendto_realops_snomask(SNO_GENERAL, L_ALL,
|
|
"Link %s introduced leafed server %s.",
|
|
client_p->name, parv[1]);
|
|
ilog(L_SERVER, "Link %s introduced leafed server %s.",
|
|
client_p->name, parv[1]);
|
|
exit_client(NULL, client_p, &me, "Leafed Server.");
|
|
return 0;
|
|
}
|
|
|
|
/* ok, alls good */
|
|
target_p = make_client(client_p);
|
|
make_server(target_p);
|
|
|
|
rb_strlcpy(target_p->name, parv[1], sizeof(target_p->name));
|
|
target_p->hopcount = atoi(parv[2]);
|
|
strcpy(target_p->id, parv[3]);
|
|
set_server_gecos(target_p, parv[4]);
|
|
|
|
target_p->servptr = source_p;
|
|
SetServer(target_p);
|
|
|
|
rb_dlinkAddTail(target_p, &target_p->node, &global_client_list);
|
|
rb_dlinkAddTailAlloc(target_p, &global_serv_list);
|
|
add_to_client_hash(target_p->name, target_p);
|
|
add_to_id_hash(target_p->id, target_p);
|
|
rb_dlinkAdd(target_p, &target_p->lnode, &target_p->servptr->serv->servers);
|
|
|
|
target_p->serv->nameinfo = scache_connect(target_p->name, target_p->info, IsHidden(target_p));
|
|
|
|
sendto_server(client_p, NULL, CAP_TS6, NOCAPS,
|
|
":%s SID %s %d %s :%s%s",
|
|
source_p->id, target_p->name, target_p->hopcount + 1,
|
|
target_p->id, IsHidden(target_p) ? "(H) " : "", target_p->info);
|
|
|
|
sendto_realops_snomask(SNO_EXTERNAL, L_ALL,
|
|
"Server %s being introduced by %s", target_p->name, source_p->name);
|
|
|
|
/* quick, dirty EOB. you know you love it. */
|
|
sendto_one(target_p, ":%s PING %s %s",
|
|
get_id(&me, target_p), me.name, get_id(target_p, target_p));
|
|
|
|
hdata.client = source_p;
|
|
hdata.target = target_p;
|
|
call_hook(h_server_introduced, &hdata);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* 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, const char *info)
|
|
{
|
|
/* check the info for [IP] */
|
|
if(info[0])
|
|
{
|
|
char *p;
|
|
char *s;
|
|
char *t;
|
|
|
|
s = LOCAL_COPY(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'))
|
|
{
|
|
/* a space? if not (H) could be the last part of info.. */
|
|
if((p = strchr(s, ' ')))
|
|
*p = '\0';
|
|
|
|
/* check for (H) which is a hidden server */
|
|
if(!strcmp(s, "(H)"))
|
|
{
|
|
SetHidden(client_p);
|
|
|
|
/* if there was no space.. theres nothing to set info to */
|
|
if(p)
|
|
s = ++p;
|
|
else
|
|
s = NULL;
|
|
}
|
|
else if(p)
|
|
*p = ' ';
|
|
|
|
/* if there was a trailing space, s could point to \0, so check */
|
|
if(s && (*s != '\0'))
|
|
{
|
|
rb_strlcpy(client_p->info, s, sizeof(client_p->info));
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
rb_strlcpy(client_p->info, "(Unknown Location)", sizeof(client_p->info));
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* bogus_host
|
|
*
|
|
* inputs - hostname
|
|
* output - 1 if a bogus hostname input, 0 if its valid
|
|
* side effects - none
|
|
*/
|
|
int
|
|
bogus_host(const char *host)
|
|
{
|
|
int bogus_server = 0;
|
|
const 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;
|
|
}
|