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/////////////////////////////////////////////////////////////////////////
// $Id: eth_arpback.cc,v 1.18 2005/12/10 18:37:35 vruppert Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001 MandrakeSoft S.A.
//
// MandrakeSoft S.A.
// 43, rue d'Aboukir
// 75002 Paris - France
// http://www.linux-mandrake.com/
// http://www.mandrakesoft.com/
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// eth_arpback.cc - basic ethernet packetmover, only responds to ARP
// Various networking docs:
// http://www.graphcomp.com/info/rfc/
// rfc0826: arp
// rfc0903: rarp
// Define BX_PLUGGABLE in files that can be compiled into plugins. For
// platforms that require a special tag on exported symbols, BX_PLUGGABLE
// is used to know when we are exporting symbols and when we are importing.
#define BX_PLUGGABLE
#define NO_DEVICE_INCLUDES
#include "iodev.h"
#if BX_NETWORKING && defined(ETH_ARPBACK)
#include "eth.h"
#include "crc32.h"
#include "eth_packetmaker.h"
#define LOG_THIS bx_devices.pluginNE2kDevice->
//static const Bit8u external_mac[]={0xB0, 0xC4, 0x20, 0x20, 0x00, 0x00, 0x00};
//static const Bit8u internal_mac[]={0xB0, 0xC4, 0x20, 0x00, 0x00, 0x00, 0x00};
//static const Bit8u external_ip[]={ 192, 168, 0, 2, 0x00 };
//static const Bit8u ethtype_arp[]={0x08, 0x06, 0x00};
//
// Define the class. This is private to this module
//
class bx_arpback_pktmover_c : public eth_pktmover_c {
public:
bx_arpback_pktmover_c(const char *netif, const char *macaddr,
eth_rx_handler_t rxh,
void *rxarg);
void sendpkt(void *buf, unsigned io_len);
private:
int rx_timer_index;
static void rx_timer_handler(void *);
void rx_timer(void);
FILE *txlog, *txlog_txt;
//Bit8u arpbuf[MAX_FRAME_SIZE];
//Bit32u buflen;
//bx_bool bufvalid;
//CRC_Generator mycrc;
eth_ETHmaker packetmaker;
};
//
// Define the static class that registers the derived pktmover class,
// and allocates one on request.
//
class bx_arpback_locator_c : public eth_locator_c {
public:
bx_arpback_locator_c(void) : eth_locator_c("arpback") {}
protected:
eth_pktmover_c *allocate(const char *netif, const char *macaddr,
eth_rx_handler_t rxh,
void *rxarg, char *script) {
return (new bx_arpback_pktmover_c(netif, macaddr, rxh, rxarg, script));
}
} bx_arpback_match;
//
// Define the methods for the bx_arpback_pktmover derived class
//
// the constructor
bx_arpback_pktmover_c::bx_arpback_pktmover_c(const char *netif,
const char *macaddr,
eth_rx_handler_t rxh,
void *rxarg,
char *script)
{
this->rx_timer_index =
bx_pc_system.register_timer(this, this->rx_timer_handler, 1000,
1, 1, "eth_arpback"); // continuous, active
this->rxh = rxh;
this->rxarg = rxarg;
//bufvalid=0;
packetmaker.init();
#if BX_ETH_NULL_LOGGING
// Start the rx poll
// eventually Bryce wants txlog to dump in pcap format so that
// tcpdump -r FILE can read it and interpret packets.
txlog = fopen ("ne2k-tx.log", "wb");
if (!txlog) BX_PANIC (("open ne2k-tx.log failed"));
txlog_txt = fopen ("ne2k-txdump.txt", "wb");
if (!txlog_txt) BX_PANIC (("open ne2k-txdump.txt failed"));
fprintf (txlog_txt, "arpback packetmover readable log file\n");
fprintf (txlog_txt, "net IF = %s\n", netif);
fprintf (txlog_txt, "MAC address = ");
for (int i=0; i<6; i++)
fprintf (txlog_txt, "%02x%s", 0xff & macaddr[i], i<5?":" : "");
fprintf (txlog_txt, "\n--\n");
fflush (txlog_txt);
#endif
}
void
bx_arpback_pktmover_c::sendpkt(void *buf, unsigned io_len)
{
if(io_len<BX_PACKET_BUFSIZE) {
eth_packet barney;
memcpy(barney.buf,buf,io_len);
barney.len=io_len;
if(packetmaker.ishandler(barney)) {
packetmaker.sendpacket(barney);
}
/*
if(( (!memcmp(buf, external_mac, 6)) || (!memcmp(buf, broadcast_macaddr, 6)) )
&& (!memcmp(((Bit8u *)buf)+12, ethtype_arp, 2)) ) {
Bit32u tempcrc;
memcpy(arpbuf,buf,io_len); //move to temporary buffer
memcpy(arpbuf, arpbuf+6, 6); //set destination to sender
memcpy(arpbuf+6, external_mac, 6); //set sender to us
memcpy(arpbuf+32, arpbuf+22, 10); //move destination to sender
memcpy(arpbuf+22, external_mac, 6); //set sender to us
memcpy(arpbuf+28, external_ip, 4); //set sender to us
arpbuf[21]=2; //make this a reply and not a request
tempcrc=mycrc.get_CRC(arpbuf,io_len);
memcpy(arpbuf+io_len, &tempcrc, 4);
buflen=io_len;//+4
bufvalid=1;
}
*/
}
#if BX_ETH_NULL_LOGGING
BX_DEBUG (("sendpkt length %u", io_len));
// dump raw bytes to a file, eventually dump in pcap format so that
// tcpdump -r FILE can interpret them for us.
int n = fwrite (buf, io_len, 1, txlog);
if (n != 1) BX_ERROR (("fwrite to txlog failed, length %u", io_len));
// dump packet in hex into an ascii log file
fprintf (txlog_txt, "NE2K transmitting a packet, length %u\n", io_len);
Bit8u *charbuf = (Bit8u *)buf;
for (n=0; n<(int)io_len; n++) {
if (((n % 16) == 0) && n>0)
fprintf (txlog_txt, "\n");
fprintf (txlog_txt, "%02x ", charbuf[n]);
}
fprintf (txlog_txt, "\n--\n");
// flush log so that we see the packets as they arrive w/o buffering
fflush (txlog);
fflush (txlog_txt);
#endif
}
void bx_arpback_pktmover_c::rx_timer_handler (void * this_ptr)
{
#if BX_ETH_NULL_LOGGING
BX_DEBUG (("rx_timer_handler"));
#endif
bx_arpback_pktmover_c *class_ptr = ((bx_arpback_pktmover_c *)this_ptr);
class_ptr->rx_timer();
}
void bx_arpback_pktmover_c::rx_timer (void)
{
//int nbytes = 0;
//struct bpf_hdr *bhdr;
eth_packet rubble;
if(packetmaker.getpacket(rubble)) {
//bufvalid=0;
void * buf=rubble.buf;
unsigned io_len=rubble.len;
Bit32u n;
fprintf (txlog_txt, "NE2K receiving a packet, length %u\n", io_len);
Bit8u *charbuf = (Bit8u *)buf;
for (n=0; n<io_len; n++) {
if (((n % 16) == 0) && n>0)
fprintf (txlog_txt, "\n");
fprintf (txlog_txt, "%02x ", charbuf[n]);
}
fprintf (txlog_txt, "\n--\n");
fflush (txlog_txt);
(*rxh)(rxarg, buf, io_len);
}
}
#endif /* if BX_NETWORKING && defined(ETH_ARPBACK) */
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