/* * IRC - Internet Relay Chat, ircd/m_connect.c * Copyright (C) 1990 Jarkko Oikarinen and * University of Oulu, Computing Center * * See file AUTHORS in IRC package for additional names of * the programmers. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 1, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * $Id: m_connect.c,v 1.13.2.1 2002/02/24 19:56:35 kev Exp $ */ /* * m_functions execute protocol messages on this server: * * cptr is always NON-NULL, pointing to a *LOCAL* client * structure (with an open socket connected!). This * identifies the physical socket where the message * originated (or which caused the m_function to be * executed--some m_functions may call others...). * * sptr is the source of the message, defined by the * prefix part of the message if present. If not * or prefix not found, then sptr==cptr. * * (!IsServer(cptr)) => (cptr == sptr), because * prefixes are taken *only* from servers... * * (IsServer(cptr)) * (sptr == cptr) => the message didn't * have the prefix. * * (sptr != cptr && IsServer(sptr) means * the prefix specified servername. (?) * * (sptr != cptr && !IsServer(sptr) means * that message originated from a remote * user (not local). * * combining * * (!IsServer(sptr)) means that, sptr can safely * taken as defining the target structure of the * message in this server. * * *Always* true (if 'parse' and others are working correct): * * 1) sptr->from == cptr (note: cptr->from == cptr) * * 2) MyConnect(sptr) <=> sptr == cptr (e.g. sptr * *cannot* be a local connection, unless it's * actually cptr!). [MyConnect(x) should probably * be defined as (x == x->from) --msa ] * * parc number of variable parameter strings (if zero, * parv is allowed to be NULL) * * parv a NULL terminated list of parameter pointers, * * parv[0], sender (prefix string), if not present * this points to an empty string. * parv[1]...parv[parc-1] * pointers to additional parameters * parv[parc] == NULL, *always* * * note: it is guaranteed that parv[0]..parv[parc-1] are all * non-NULL pointers. */ #include "config.h" #include "client.h" #include "crule.h" #include "hash.h" #include "ircd.h" #include "ircd_features.h" #include "ircd_log.h" #include "ircd_reply.h" #include "ircd_string.h" #include "jupe.h" #include "match.h" #include "msg.h" #include "numeric.h" #include "numnicks.h" #include "s_bsd.h" #include "s_conf.h" #include "s_user.h" #include "send.h" #include #include /* * ms_connect - server message handler * - Added by Jto 11 Feb 1989 * * parv[0] = sender prefix * parv[1] = servername * parv[2] = port number * parv[3] = remote server */ int ms_connect(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) { unsigned short port; unsigned short tmpport; const char* rule; struct ConfItem* aconf; struct Client* acptr; struct Jupe* ajupe; assert(0 != cptr); assert(0 != sptr); if (!IsPrivileged(sptr)) return send_reply(sptr, ERR_NOPRIVILEGES); if (parc < 4) { /* * this is coming from a server which should have already * checked it's args, if we don't have parc == 4, something * isn't right. */ protocol_violation(sptr, "Too few parameters to connect"); return need_more_params(sptr, "CONNECT"); } if (hunt_server_cmd(sptr, CMD_CONNECT, cptr, 1, "%s %s :%C", 3, parc, parv) != HUNTED_ISME) return 0; /* * need to find the conf entry first so we can use the server name from * the conf entry instead of parv[1] to find out if the server is already * present below. --Bleep */ if (0 == (aconf = conf_find_server(parv[1]))) { sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Host %s not listed " "in ircd.conf", sptr, parv[1]); return 0; } /* * use aconf->name to look up the server */ if ((acptr = FindServer(aconf->name))) { sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Server %s already " "exists from %s", sptr, parv[1], cli_name(cli_from(acptr))); return 0; } /* * Evaluate connection rules... If no rules found, allow the * connect. Otherwise stop with the first true rule (ie: rules * are ored together. Oper connects are effected only by D * lines (CRULEALL) not d lines (CRULEAUTO). */ if ((rule = conf_eval_crule(aconf->name, CRULE_ALL))) { sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Disallowed by rule: %s", sptr, rule); return 0; } /* * Check to see if the server is juped; if it is, disallow the connect */ if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe)) { sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Server %s is juped: %s", sptr, JupeServer(ajupe), JupeReason(ajupe)); return 0; } /* * Allow opers to /connect foo.* 0 bah.* to connect foo and bah * using the conf's configured port */ port = atoi(parv[2]); /* * save the old port */ tmpport = aconf->port; if (port) { aconf->port = port; } else { port = aconf->port; } /* * Notify all operators about remote connect requests */ sendwallto_group_butone(&me, WALL_WALLOPS, 0, "Remote CONNECT %s %s from %s", parv[1], parv[2] ? parv[2] : "", get_client_name(sptr, HIDE_IP)); log_write(LS_NETWORK, L_INFO, 0, "CONNECT From %C : %s %s", sptr, parv[1], parv[2] ? parv[2] : ""); if (connect_server(aconf, sptr, 0)) { sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Connecting to %s.", sptr, aconf->name); } else { sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Connection to %s failed", sptr, aconf->name); } aconf->port = tmpport; return 0; } /* * mo_connect - oper message handler * - Added by Jto 11 Feb 1989 * * parv[0] = sender prefix * parv[1] = servername * parv[2] = port number * parv[3] = remote server */ int mo_connect(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) { unsigned short port; unsigned short tmpport; const char* rule; struct ConfItem* aconf; struct Client* acptr; struct Jupe* ajupe; assert(0 != cptr); assert(cptr == sptr); assert(IsAnOper(sptr)); if (parc < 2) return need_more_params(sptr, "CONNECT"); if (parc > 3) { /* * if parc > 3, we are trying to connect two remote * servers to each other */ if (IsLocOp(sptr)) { /* * Only allow LocOps to make local CONNECTS --SRB */ return 0; } else { struct Client* acptr2; struct Client* acptr3; if (!(acptr3 = find_match_server(parv[3]))) { send_reply(sptr, ERR_NOSUCHSERVER, parv[3]); return 0; } /* * Look for closest matching server * needed for "/connect blah 4400 *"? */ for (acptr2 = acptr3; acptr2 != &me; acptr2 = cli_serv(acptr2)->up) { if (!match(parv[3], cli_name(acptr2))) acptr3 = acptr2; } parv[3] = cli_name(acptr3); if (hunt_server_cmd(sptr, CMD_CONNECT, cptr, 1, "%s %s :%C", 3, parc, parv) != HUNTED_ISME) return 0; } } /* * need to find the conf entry first so we can use the server name from * the conf entry instead of parv[1] to find out if the server is already * present below. --Bleep */ if (0 == (aconf = conf_find_server(parv[1]))) { sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Host %s not listed " "in ircd.conf", sptr, parv[1]); return 0; } /* * use aconf->name to look up the server, see above */ if ((acptr = FindServer(aconf->name))) { sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Server %s already " "exists from %s", sptr, parv[1], cli_name(cli_from(acptr))); return 0; } /* * Evaluate connection rules... If no rules found, allow the * connect. Otherwise stop with the first true rule (ie: rules * are ored together. Oper connects are effected only by D * lines (CRULEALL) not d lines (CRULEAUTO). */ if ((rule = conf_eval_crule(aconf->name, CRULE_ALL))) { sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Disallowed by rule: %s", sptr, rule); return 0; } /* * Check to see if the server is juped; if it is, disallow the connect */ if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe)) { sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Server %s is juped: %s", sptr, JupeServer(ajupe), JupeReason(ajupe)); return 0; } /* * Get port number from user, if given. If not specified, * use the default from configuration structure. If missing * from there, then use the precompiled default. */ port = aconf->port; if (parc > 2) { assert(0 != parv[2]); if (0 == (port = atoi(parv[2]))) { sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Invalid port number", sptr); return 0; } } if (0 == port && 0 == (port = feature_int(FEAT_SERVER_PORT))) { sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: missing port number", sptr); return 0; } tmpport = aconf->port; aconf->port = port; if (connect_server(aconf, sptr, 0)) { sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Connecting to %s.", sptr, aconf->name); } else { sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Connection to %s failed", sptr, aconf->name); } aconf->port = tmpport; return 0; }