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gbeauche |
1.1 |
/*
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* icmp.cpp - ip router
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*
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gbeauche |
1.2 |
* Basilisk II (C) 1997-2005 Christian Bauer
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gbeauche |
1.1 |
*
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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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#include "sysdeps.h"
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#include "cpu_emulation.h"
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#include "ws2tcpip.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 "icmp.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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// Saved for cleanup.
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static socket_t *icmp_incoming_s = 0;
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void stop_icmp_listen()
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{
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if(icmp_incoming_s) {
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delete icmp_incoming_s;
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icmp_incoming_s = 0;
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}
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}
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void start_icmp_listen()
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{
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if(!icmp_incoming_s) {
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icmp_incoming_s = new socket_t(IPPROTO_ICMP);
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icmp_incoming_s->permanent = TRUE;
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icmp_incoming_s->s = _socket( AF_INET, SOCK_RAW, IPPROTO_ICMP );
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memset( &icmp_incoming_s->from, 0, icmp_incoming_s->from_len );
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icmp_incoming_s->from.sin_family = AF_INET;
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if(icmp_incoming_s->s == INVALID_SOCKET) {
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D(bug("Failed to create icmp listening socket (NT/no admin?)\r\n" ));
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delete icmp_incoming_s;
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icmp_incoming_s = 0;
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} else {
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D(bug("icmp listening socket created\r\n" ));
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raw_sockets_available = true;
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struct sockaddr_in to;
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memset( &to, 0, sizeof(to) );
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to.sin_family = AF_INET;
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if( _bind ( icmp_incoming_s->s, (const struct sockaddr *)&to, sizeof(to) ) == SOCKET_ERROR ) {
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D(bug("Listening to inbound icmp failed, error code = %d\r\n", _WSAGetLastError() ));
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_closesocket( icmp_incoming_s->s );
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delete icmp_incoming_s;
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icmp_incoming_s = 0;
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} else {
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D(bug("icmp listening socket bound\r\n" ));
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if(!icmp_incoming_s->b_recfrom()) {
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D(bug("b_recfrom() from inbound icmp failed, error code = %d\r\n", _WSAGetLastError() ));
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// _closesocket( icmp_incoming_s->s );
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// delete icmp_incoming_s;
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// icmp_incoming_s = 0;
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}
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}
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}
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}
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}
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void CALLBACK icmp_read_completion(
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DWORD error,
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DWORD bytes_read,
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LPWSAOVERLAPPED lpOverlapped,
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DWORD flags
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)
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{
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D(bug("icmp_read_completion(error=0x%x, bytes_read=%d, flags=0x%x)\r\n", error, bytes_read, flags));
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socket_t *cmpl = (socket_t *)lpOverlapped->hEvent;
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if(error == 0 && macos_ip_address != 0) {
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if(bytes_read > 1460) {
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D(bug("discarding oversized icmp packet, size = \r\n", bytes_read));
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} else {
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int icmp_size = sizeof(mac_t) + bytes_read;
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icmp_t *icmp = (icmp_t *)malloc( icmp_size );
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if(icmp) {
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mac_t *mac = (mac_t *)icmp;
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ip_t *ip = (ip_t *)icmp;
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memcpy( mac->dest, ether_addr, 6 );
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memcpy( mac->src, router_mac_addr, 6 );
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mac->type = htons(mac_type_ip4);
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// Copy payload (used by ICMP checksum)
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memcpy( (char *)icmp + sizeof(mac_t), cmpl->buffers[0].buf, bytes_read );
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switch( icmp->type ) {
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// May need to patch the returned ip header.
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case icmp_Destination_unreachable:
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case icmp_Source_quench:
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case icmp_Redirect:
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case icmp_Time_exceeded:
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case icmp_Parameter_problem:
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ip_t *ip_if = (ip_t *)( (char *)icmp + sizeof(icmp_t) + sizeof(uint32) - sizeof(mac_t) );
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// This would be needed (traceroute)
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// ip_if->ident = ??;
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// Cannot fix some fields, this should be enough:
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ip_if->src = htonl(macos_ip_address);
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if(ip_if->proto == ip_proto_udp) {
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udp_t *udp_if = (udp_t *)ip_if;
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// udp_if->src_port = ... don't know!;
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} else if(ip_if->proto == ip_proto_tcp) {
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tcp_t *tcp_if = (tcp_t *)ip_if;
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// tcp_if->src_port = ... don't know!;
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}
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break;
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}
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make_icmp_checksum( icmp, icmp_size );
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// Replace the target ip address
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ip->dest = htonl(macos_ip_address);
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ip->ttl--;
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make_ip4_checksum( ip );
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dump_bytes( (uint8 *)icmp, icmp_size );
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if( ip->ttl == 0 ) {
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D(bug("icmp packet ttl expired\r\n"));
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} else {
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enqueue_packet( (uint8 *)icmp, icmp_size );
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}
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free(icmp);
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}
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}
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}
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memset( &cmpl->from, 0, cmpl->from_len );
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if(is_router_shutting_down) {
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delete cmpl;
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} else if(cmpl->s == INVALID_SOCKET || !cmpl->b_recfrom()) {
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// delete cmpl;
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}
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}
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void write_icmp( icmp_t *icmp, int len )
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{
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struct in_addr ia;
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ia.s_addr = icmp->ip.dest;
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D(bug("write_icmp(%s)\r\n", _inet_ntoa(ia) ));
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if(!raw_sockets_available) {
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D(bug("write_icmp() cannot proceed, raw sockets not available\r\n" ));
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return;
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}
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if(len < sizeof(icmp_t)) {
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D(bug("Too small icmp packet(%d), dropped\r\n", len));
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return;
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}
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// must be updated, ttl changed
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make_icmp_checksum( icmp, len );
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SOCKET s = _socket( AF_INET, SOCK_RAW, IPPROTO_ICMP );
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if(s != INVALID_SOCKET) {
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struct sockaddr_in to;
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memset( &to, 0, sizeof(to) );
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to.sin_family = AF_INET;
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to.sin_addr.s_addr = icmp->ip.dest;
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char *data = (char *)icmp + sizeof(ip_t);
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int dlen = len - sizeof(ip_t);
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int ttl = icmp->ip.ttl;
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if(_setsockopt( s, IPPROTO_IP, IP_TTL, (const char *)&ttl, sizeof(int) ) == SOCKET_ERROR ) {
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D(bug("could not set ttl to %d.\r\n", ttl));
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} else {
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D(bug("ttl set to %d.\r\n", ttl));
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}
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if(SOCKET_ERROR == _sendto( s, data, dlen, 0, (struct sockaddr *)&to, sizeof(to) )) {
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D(bug("Failed to send icmp via raw socket\r\n" ));
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}
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_closesocket(s);
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} else {
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D(bug("Could not create raw socket for icmp\r\n" ));
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}
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}
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