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Viewing changes to src/Windows/router/router.cpp

  • Committer: Bazaar Package Importer
  • Author(s): Jonas Smedegaard
  • Date: 2008-03-06 19:33:01 UTC
  • mfrom: (2.1.4 gutsy)
  • Revision ID: james.westby@ubuntu.com-20080306193301-cc2ofn705nfsq3y0
Tags: 0.9.20070407-4
* Update copyright-check cdbs snippet to parse licensecheck using perl:
  + No longer randomly drops newlines
  + More compact hint file (and ordered more like wiki-proposed new copyright
    syntax).
  + No longer ignore files without copyright.
* Update copyright_hints.

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src/Windows/router/router.cpp
 
1
/*
 
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 *  router.cpp - ip router
 
3
 *
 
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 *  Basilisk II (C) 1997-2001 Christian Bauer
 
5
 *
 
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 *  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,
 
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 *  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
/*
 
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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.
 
27
 */
 
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#include "sysdeps.h"
 
30
 
 
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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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52
 
 
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#if DEBUG
 
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#pragma optimize("",off)
 
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#endif
 
56
 
 
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#include "debug.h"
 
58
 
 
59
 
 
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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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// 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;
 
123
                }
 
124
        }
 
125
        return result;
 
126
}
 
127
 
 
128
bool router_read_packet(uint8 *packet, int len)
 
129
{
 
130
        bool result = false;
 
131
 
 
132
        if( len >= 14 ) {
 
133
                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;
 
139
                }
 
140
        }
 
141
        return result;
 
142
}
 
143
 
 
144
/*
 
145
        This has nothing to do with TCP TIME_WAITs or CLOSE_WAITs,
 
146
        the thread is needed to close down expired udp sockets.
 
147
        Arguably an ugly hack, but needed since there is no way to
 
148
        listen to all ports w/o writing another ndis filter driver
 
149
*/
 
150
static WINAPI unsigned int router_expire_thread(void *arg)
 
151
{
 
152
        while(!is_router_shutting_down) {
 
153
                close_old_sockets();
 
154
                Sleep(1000);
 
155
        }
 
156
        return 0;
 
157
}
 
158
 
 
159
bool router_init(void)
 
160
{
 
161
        InitializeCriticalSection( &router_section );
 
162
 
 
163
        if(dynsockets_init()) {
 
164
                char me[128];
 
165
                if( _gethostname(me, sizeof(me)) == SOCKET_ERROR ) {
 
166
                        D(bug("gethostname() failed, error = %d\r\n", _WSAGetLastError()));
 
167
                } else {
 
168
                        struct hostent *hent = _gethostbyname(me);
 
169
                        if( hent == NULL ) {
 
170
                                D(bug("gethostbyname() failed, error = %d\r\n", _WSAGetLastError()));
 
171
                        } else {
 
172
                                struct in_addr *ina = (struct in_addr *) *hent->h_addr_list;
 
173
                                router_ip_address = ntohl(ina->s_addr);
 
174
                          D(bug("router protocol address seems to be %s (used only in icmp error messages)\r\n", _inet_ntoa(*ina)));
 
175
                        } 
 
176
                }
 
177
                is_router_shutting_down = false;
 
178
                r_handle = (HANDLE)_beginthreadex( 0, 0, router_expire_thread, 0, 0, &rh_tid );
 
179
                init_interfaces();
 
180
                init_tcp();
 
181
                init_udp();
 
182
                init_ftp();
 
183
                return true;
 
184
        }
 
185
 
 
186
        return false;
 
187
}
 
188
 
 
189
void router_final(void)
 
190
{
 
191
        final_interfaces();
 
192
        stop_icmp_listen();
 
193
        close_all_sockets();
 
194
        if(r_handle) {
 
195
                is_router_shutting_down = true;
 
196
                WaitForSingleObject( r_handle, INFINITE );
 
197
                final_tcp();
 
198
                final_udp();
 
199
                dynsockets_final();
 
200
        }
 
201
        DeleteCriticalSection( &router_section );
 
202
}