| 1 |
gbeauche |
1.1 |
/*
|
| 2 |
|
|
* router.cpp - ip router
|
| 3 |
|
|
*
|
| 4 |
|
|
* Basilisk II (C) 1997-2001 Christian Bauer
|
| 5 |
|
|
*
|
| 6 |
|
|
* Windows platform specific code copyright (C) Lauri Pesonen
|
| 7 |
|
|
*
|
| 8 |
|
|
* This program is free software; you can redistribute it and/or modify
|
| 9 |
|
|
* it under the terms of the GNU General Public License as published by
|
| 10 |
|
|
* the Free Software Foundation; either version 2 of the License, or
|
| 11 |
|
|
* (at your option) any later version.
|
| 12 |
|
|
*
|
| 13 |
|
|
* This program is distributed in the hope that it will be useful,
|
| 14 |
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 15 |
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
| 16 |
|
|
* GNU General Public License for more details.
|
| 17 |
|
|
*
|
| 18 |
|
|
* You should have received a copy of the GNU General Public License
|
| 19 |
|
|
* along with this program; if not, write to the Free Software
|
| 20 |
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
| 21 |
|
|
*/
|
| 22 |
|
|
|
| 23 |
|
|
/*
|
| 24 |
|
|
* This could be implemented by writing three (9x,nt,2k)
|
| 25 |
|
|
* NDIS filter drivers. No thanks.
|
| 26 |
|
|
* But this is not easy either.
|
| 27 |
|
|
*/
|
| 28 |
|
|
|
| 29 |
|
|
#include "sysdeps.h"
|
| 30 |
|
|
|
| 31 |
|
|
#define WIN32_LEAN_AND_MEAN
|
| 32 |
|
|
#include <windows.h>
|
| 33 |
|
|
#include <process.h>
|
| 34 |
|
|
|
| 35 |
|
|
#include "cpu_emulation.h"
|
| 36 |
|
|
#include "prefs.h"
|
| 37 |
|
|
#include "ether_windows.h"
|
| 38 |
|
|
#include "ether.h"
|
| 39 |
|
|
#include "router.h"
|
| 40 |
|
|
#include "router_types.h"
|
| 41 |
|
|
#include "dynsockets.h"
|
| 42 |
|
|
#include "ipsocket.h"
|
| 43 |
|
|
#include "iphelp.h"
|
| 44 |
|
|
#include "arp.h"
|
| 45 |
|
|
#include "icmp.h"
|
| 46 |
|
|
#include "udp.h"
|
| 47 |
|
|
#include "tcp.h"
|
| 48 |
|
|
#include "ftp.h"
|
| 49 |
|
|
#include "mib/interfaces.h"
|
| 50 |
|
|
#include "dump.h"
|
| 51 |
|
|
|
| 52 |
|
|
|
| 53 |
|
|
#if DEBUG
|
| 54 |
|
|
#pragma optimize("",off)
|
| 55 |
|
|
#endif
|
| 56 |
|
|
|
| 57 |
|
|
#include "debug.h"
|
| 58 |
|
|
|
| 59 |
|
|
|
| 60 |
|
|
uint16 next_ip_ident_number = 1;
|
| 61 |
|
|
uint32 macos_ip_address = 0;
|
| 62 |
|
|
const uint8 router_mac_addr[6] = { '4', '2', '6', '7', '7', '9' };
|
| 63 |
|
|
uint32 router_ip_address = 0;
|
| 64 |
|
|
bool raw_sockets_available = false;
|
| 65 |
|
|
bool m_router_enabled = true;
|
| 66 |
|
|
|
| 67 |
|
|
|
| 68 |
|
|
|
| 69 |
|
|
// Protected data.
|
| 70 |
|
|
CRITICAL_SECTION router_section;
|
| 71 |
|
|
bool is_router_shutting_down = false;
|
| 72 |
|
|
static HANDLE r_handle = 0;
|
| 73 |
|
|
static unsigned int rh_tid = 0;
|
| 74 |
|
|
|
| 75 |
|
|
|
| 76 |
|
|
static void write_ip4( ip_t *ip, int len )
|
| 77 |
|
|
{
|
| 78 |
|
|
if(len < sizeof(ip_t)) {
|
| 79 |
|
|
D(bug("Too small ip packet(%d), dropped\r\n", len));
|
| 80 |
|
|
} else {
|
| 81 |
|
|
uint8 proto = ip->proto;
|
| 82 |
|
|
|
| 83 |
|
|
// This is a router, decrement the hop count
|
| 84 |
|
|
if( --ip->ttl == 0 ) {
|
| 85 |
|
|
// Most likely this is some Mac traceroute app
|
| 86 |
|
|
D(bug("ip packet ttl expired, proto=%d.\r\n", proto));
|
| 87 |
|
|
error_winsock_2_icmp( WSAETTLEXCEEDED, ip, len );
|
| 88 |
|
|
} else {
|
| 89 |
|
|
switch( proto ) {
|
| 90 |
|
|
case ip_proto_icmp:
|
| 91 |
|
|
write_icmp( (icmp_t *)ip, len );
|
| 92 |
|
|
break;
|
| 93 |
|
|
case ip_proto_tcp:
|
| 94 |
|
|
write_tcp( (tcp_t *)ip, len );
|
| 95 |
|
|
break;
|
| 96 |
|
|
case ip_proto_udp:
|
| 97 |
|
|
write_udp( (udp_t *)ip, len );
|
| 98 |
|
|
break;
|
| 99 |
|
|
default:
|
| 100 |
|
|
D(bug("write_ip4() len=%d, proto=%d\r\n", len, proto));
|
| 101 |
|
|
break;
|
| 102 |
|
|
}
|
| 103 |
|
|
}
|
| 104 |
|
|
}
|
| 105 |
|
|
}
|
| 106 |
|
|
|
| 107 |
|
|
bool router_write_packet(uint8 *packet, int len)
|
| 108 |
|
|
{
|
| 109 |
|
|
bool result = false;
|
| 110 |
|
|
|
| 111 |
|
|
if( len >= 14 ) {
|
| 112 |
|
|
switch( ntohs( ((mac_t *)packet)->type ) ) {
|
| 113 |
|
|
case mac_type_ip4:
|
| 114 |
|
|
write_ip4( (ip_t *)packet, len );
|
| 115 |
|
|
result = true;
|
| 116 |
|
|
break;
|
| 117 |
|
|
case mac_type_ip6:
|
| 118 |
|
|
D(bug("write_ip6() len=%d; unsupported.\r\n", len));
|
| 119 |
|
|
result = true;
|
| 120 |
|
|
break;
|
| 121 |
|
|
case mac_type_arp:
|
| 122 |
|
|
result = write_arp( (arp_t *)packet, len );
|
| 123 |
|
|
break;
|
| 124 |
|
|
}
|
| 125 |
|
|
}
|
| 126 |
|
|
return result;
|
| 127 |
|
|
}
|
| 128 |
|
|
|
| 129 |
|
|
bool router_read_packet(uint8 *packet, int len)
|
| 130 |
|
|
{
|
| 131 |
|
|
bool result = false;
|
| 132 |
|
|
|
| 133 |
|
|
if( len >= 14 ) {
|
| 134 |
|
|
switch( ntohs( ((mac_t *)packet)->type ) ) {
|
| 135 |
|
|
case mac_type_ip4:
|
| 136 |
|
|
case mac_type_ip6:
|
| 137 |
|
|
case mac_type_arp:
|
| 138 |
|
|
result = true;
|
| 139 |
|
|
break;
|
| 140 |
|
|
}
|
| 141 |
|
|
}
|
| 142 |
|
|
return result;
|
| 143 |
|
|
}
|
| 144 |
|
|
|
| 145 |
|
|
/*
|
| 146 |
|
|
This has nothing to do with TCP TIME_WAITs or CLOSE_WAITs,
|
| 147 |
|
|
the thread is needed to close down expired udp sockets.
|
| 148 |
|
|
Arguably an ugly hack, but needed since there is no way to
|
| 149 |
|
|
listen to all ports w/o writing another ndis filter driver
|
| 150 |
|
|
*/
|
| 151 |
|
|
static WINAPI unsigned int router_expire_thread(void *arg)
|
| 152 |
|
|
{
|
| 153 |
|
|
while(!is_router_shutting_down) {
|
| 154 |
|
|
close_old_sockets();
|
| 155 |
|
|
Sleep(1000);
|
| 156 |
|
|
}
|
| 157 |
|
|
return 0;
|
| 158 |
|
|
}
|
| 159 |
|
|
|
| 160 |
|
|
void router_init(void)
|
| 161 |
|
|
{
|
| 162 |
|
|
InitializeCriticalSection( &router_section );
|
| 163 |
|
|
|
| 164 |
|
|
m_router_enabled = PrefsFindBool("routerenabled");
|
| 165 |
|
|
|
| 166 |
|
|
if(m_router_enabled && dynsockets_init()) {
|
| 167 |
|
|
char me[128];
|
| 168 |
|
|
if( _gethostname(me, sizeof(me)) == SOCKET_ERROR ) {
|
| 169 |
|
|
D(bug("gethostname() failed, error = %d\r\n", _WSAGetLastError()));
|
| 170 |
|
|
} else {
|
| 171 |
|
|
struct hostent *hent = _gethostbyname(me);
|
| 172 |
|
|
if( hent == NULL ) {
|
| 173 |
|
|
D(bug("gethostbyname() failed, error = %d\r\n", _WSAGetLastError()));
|
| 174 |
|
|
} else {
|
| 175 |
|
|
struct in_addr *ina = (struct in_addr *) *hent->h_addr_list;
|
| 176 |
|
|
router_ip_address = ntohl(ina->s_addr);
|
| 177 |
|
|
D(bug("router protocol address seems to be %s (used only in icmp error messages)\r\n", _inet_ntoa(*ina)));
|
| 178 |
|
|
}
|
| 179 |
|
|
}
|
| 180 |
|
|
is_router_shutting_down = false;
|
| 181 |
|
|
r_handle = (HANDLE)_beginthreadex( 0, 0, router_expire_thread, 0, 0, &rh_tid );
|
| 182 |
|
|
init_interfaces();
|
| 183 |
|
|
init_tcp();
|
| 184 |
|
|
init_udp();
|
| 185 |
|
|
init_ftp();
|
| 186 |
|
|
} else {
|
| 187 |
|
|
m_router_enabled = false;
|
| 188 |
|
|
}
|
| 189 |
|
|
}
|
| 190 |
|
|
|
| 191 |
|
|
void router_final(void)
|
| 192 |
|
|
{
|
| 193 |
|
|
final_interfaces();
|
| 194 |
|
|
stop_icmp_listen();
|
| 195 |
|
|
close_all_sockets();
|
| 196 |
|
|
if(r_handle) {
|
| 197 |
|
|
is_router_shutting_down = true;
|
| 198 |
|
|
WaitForSingleObject( r_handle, INFINITE );
|
| 199 |
|
|
final_tcp();
|
| 200 |
|
|
final_udp();
|
| 201 |
|
|
dynsockets_final();
|
| 202 |
|
|
}
|
| 203 |
|
|
DeleteCriticalSection( &router_section );
|
| 204 |
|
|
}
|
