diff options
Diffstat (limited to 'src/fake86/packet.c')
| -rwxr-xr-x | src/fake86/packet.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/src/fake86/packet.c b/src/fake86/packet.c new file mode 100755 index 0000000..38ce12e --- /dev/null +++ b/src/fake86/packet.c @@ -0,0 +1,185 @@ +/* + Fake86: A portable, open-source 8086 PC emulator. + Copyright (C)2010-2013 Mike Chambers + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License + as published by the Free Software Foundation; either version 2 + of the License, or (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. +*/ + +/* packet.c: functions to interface with libpcap/winpcap for ethernet emulation. */ + +#include "config.h" + +#ifdef NETWORKING_ENABLED +#define HAVE_REMOTE +#define WPCAP +#include <pcap.h> +#include <stdint.h> +#include <stdlib.h> +#include <memory.h> + +#ifndef _WIN32 +#define PCAP_OPENFLAG_PROMISCUOUS 1 +#endif + +extern uint8_t RAM[0x100000]; +extern uint8_t verbose; +uint8_t ethif, net_enabled = 0; +uint8_t dopktrecv = 0; +uint16_t rcvseg, rcvoff, hdrlen, handpkt; + +pcap_if_t *alldevs; +pcap_if_t *d; +pcap_t *adhandle; +const u_char *pktdata; +struct pcap_pkthdr *hdr; +int inum; +uint16_t curhandle = 0; +char errbuf[PCAP_ERRBUF_SIZE]; +uint8_t maclocal[6] = { 0xDE, 0xAD, 0xBE, 0xEF, 0x13, 0x37 }; + +void initpcap() { + int i=0; + + printf ("\nObtaining NIC list via libpcap...\n"); + + /* Retrieve the device list from the local machine */ +#if defined(_WIN32) + if (pcap_findalldevs_ex (PCAP_SRC_IF_STRING, NULL /* auth is not needed */, &alldevs, errbuf) == -1) +#else + if (pcap_findalldevs (&alldevs, errbuf) == -1) +#endif + { + printf ("Error in pcap_findalldevs_ex: %s\n", errbuf); + exit (1); + } + + /* Print the list */ + for (d= alldevs; d != NULL; d= d->next) { + i++; + if (ethif==255) { + printf ("%d. %s", i, d->name); + if (d->description) { + printf (" (%s)\n", d->description); + } + else { + printf (" (No description available)\n"); + } + } + } + + if (i == 0) { + printf ("\nNo interfaces found! Make sure WinPcap is installed.\n"); + return; + } + + printf ("\n"); + + if (ethif==255) exit (0); + else inum = ethif; + printf ("Using network interface %u.\n", ethif); + + + if (inum < 1 || inum > i) { + printf ("\nInterface number out of range.\n"); + /* Free the device list */ + pcap_freealldevs (alldevs); + return; + } + + /* Jump to the selected adapter */ + for (d=alldevs, i=0; i< inum-1 ; d=d->next, i++); + + /* Open the device */ +#ifdef _WIN32 + if ( (adhandle= pcap_open (d->name, 65536, PCAP_OPENFLAG_PROMISCUOUS, -1, NULL, errbuf) ) == NULL) +#else + if ( (adhandle= pcap_open_live (d->name, 65535, 1, -1, NULL) ) == NULL) +#endif + { + printf ("\nUnable to open the adapter. %s is not supported by WinPcap\n", d->name); + /* Free the device list */ + pcap_freealldevs (alldevs); + return; + } + + printf ("\nEthernet bridge on %s...\n", d->description); + + /* At this point, we don't need any more the device list. Free it */ + pcap_freealldevs (alldevs); + net_enabled = 1; +} + +void setmac() { + memcpy (&RAM[0xE0000], &maclocal[0], 6); +} + +#ifndef NETWORKING_OLDCARD +extern int ne2000_can_receive(); +extern void ne2000_receive (const uint8_t *buf, int size); + +uint8_t newrecv[5000]; + +void dispatch() { + uint16_t i; + + if (pcap_next_ex (adhandle, &hdr, &pktdata) <=0) return; + if (hdr->len==0) return; + if (ne2000_can_receive() ) { + for (i=0; i<hdr->len; i++) { + newrecv[i<<1] = pktdata[i]; + newrecv[ (i<<1) +1] = 0; + } + ne2000_receive (newrecv, hdr->len); + } + return; +} + +void sendpkt (uint8_t *src, uint16_t len) { + uint16_t i; + for (i=0; i<len; i++) { + printf ("%02X ", src[i]); + } + printf ("\n"); + pcap_sendpacket (adhandle, src, len); +} +#else +extern struct netstruct { + uint8_t enabled; + uint8_t canrecv; + uint16_t pktlen; +} net; + +extern void doirq (uint8_t irqnum); + +void dispatch() { + if (pcap_next_ex (adhandle, &hdr, &pktdata) <=0) return; + if (hdr->len==0) return; + + net.canrecv = 0; + memcpy (&RAM[0xD0000], &pktdata[0], hdr->len); + net.pktlen = (uint16_t) hdr->len; + if (verbose) { + printf ("Received packet of %u bytes.\n", net.pktlen); + } + doirq (6); + return; +} + +void sendpkt (uint8_t *src, uint16_t len) { + pcap_sendpacket (adhandle, src, len); +} +#endif + +#endif |