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/*
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* router.cpp - ip router
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*
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* Basilisk II (C) 1997-2001 Christian Bauer
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*
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* Windows platform specific code copyright (C) Lauri Pesonen
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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 USA
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*/
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/*
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* This could be implemented by writing three (9x,nt,2k)
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* NDIS filter drivers. No thanks.
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* But this is not easy either.
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*/
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#include "sysdeps.h"
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <process.h>
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#include "cpu_emulation.h"
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#include "prefs.h"
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#include "ether_windows.h"
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#include "ether.h"
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#include "router.h"
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#include "router_types.h"
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#include "dynsockets.h"
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#include "ipsocket.h"
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#include "iphelp.h"
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#include "arp.h"
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#include "icmp.h"
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#include "udp.h"
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#include "tcp.h"
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#include "ftp.h"
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#include "mib/interfaces.h"
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#include "dump.h"
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#if DEBUG
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#pragma optimize("",off)
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#endif
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#include "debug.h"
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uint16 next_ip_ident_number = 1;
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uint32 macos_ip_address = 0;
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const uint8 router_mac_addr[6] = { '4', '2', '6', '7', '7', '9' };
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uint32 router_ip_address = 0;
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bool raw_sockets_available = false;
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bool m_router_enabled = true;
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// Protected data.
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CRITICAL_SECTION router_section;
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bool is_router_shutting_down = false;
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static HANDLE r_handle = 0;
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static unsigned int rh_tid = 0;
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static void write_ip4( ip_t *ip, int len )
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{
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if(len < sizeof(ip_t)) {
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D(bug("Too small ip packet(%d), dropped\r\n", len));
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} else {
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uint8 proto = ip->proto;
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// This is a router, decrement the hop count
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if( --ip->ttl == 0 ) {
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// Most likely this is some Mac traceroute app
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D(bug("ip packet ttl expired, proto=%d.\r\n", proto));
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error_winsock_2_icmp( WSAETTLEXCEEDED, ip, len );
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} else {
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switch( proto ) {
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case ip_proto_icmp:
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write_icmp( (icmp_t *)ip, len );
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break;
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case ip_proto_tcp:
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write_tcp( (tcp_t *)ip, len );
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break;
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case ip_proto_udp:
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write_udp( (udp_t *)ip, len );
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break;
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default:
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D(bug("write_ip4() len=%d, proto=%d\r\n", len, proto));
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break;
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}
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}
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}
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}
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bool router_write_packet(uint8 *packet, int len)
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{
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bool result = false;
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if( len >= 14 ) {
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switch( ntohs( ((mac_t *)packet)->type ) ) {
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case mac_type_ip4:
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write_ip4( (ip_t *)packet, len );
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result = true;
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break;
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case mac_type_ip6:
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D(bug("write_ip6() len=%d; unsupported.\r\n", len));
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result = true;
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break;
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case mac_type_arp:
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result = write_arp( (arp_t *)packet, len );
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break;
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}
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}
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return result;
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}
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bool router_read_packet(uint8 *packet, int len)
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{
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bool result = false;
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if( len >= 14 ) {
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switch( ntohs( ((mac_t *)packet)->type ) ) {
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case mac_type_ip4:
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case mac_type_ip6:
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case mac_type_arp:
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result = true;
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break;
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}
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}
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return result;
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}
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/*
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This has nothing to do with TCP TIME_WAITs or CLOSE_WAITs,
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the thread is needed to close down expired udp sockets.
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Arguably an ugly hack, but needed since there is no way to
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listen to all ports w/o writing another ndis filter driver
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*/
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static WINAPI unsigned int router_expire_thread(void *arg)
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{
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while(!is_router_shutting_down) {
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close_old_sockets();
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Sleep(1000);
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}
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return 0;
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}
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void router_init(void)
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{
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InitializeCriticalSection( &router_section );
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m_router_enabled = PrefsFindBool("routerenabled");
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if(m_router_enabled && dynsockets_init()) {
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char me[128];
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if( _gethostname(me, sizeof(me)) == SOCKET_ERROR ) {
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D(bug("gethostname() failed, error = %d\r\n", _WSAGetLastError()));
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} else {
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struct hostent *hent = _gethostbyname(me);
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if( hent == NULL ) {
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D(bug("gethostbyname() failed, error = %d\r\n", _WSAGetLastError()));
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} else {
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struct in_addr *ina = (struct in_addr *) *hent->h_addr_list;
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router_ip_address = ntohl(ina->s_addr);
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D(bug("router protocol address seems to be %s (used only in icmp error messages)\r\n", _inet_ntoa(*ina)));
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}
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}
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is_router_shutting_down = false;
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r_handle = (HANDLE)_beginthreadex( 0, 0, router_expire_thread, 0, 0, &rh_tid );
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init_interfaces();
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init_tcp();
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init_udp();
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init_ftp();
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} else {
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m_router_enabled = false;
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}
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}
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void router_final(void)
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{
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final_interfaces();
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stop_icmp_listen();
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close_all_sockets();
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if(r_handle) {
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is_router_shutting_down = true;
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WaitForSingleObject( r_handle, INFINITE );
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final_tcp();
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final_udp();
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dynsockets_final();
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}
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DeleteCriticalSection( &router_section );
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}
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