Added the ability to set sound to use STEREO16 format instead of STEREO_FLOAT32 (defaults to STEREO_FLOAT32);
Moved network-related files to their own subdirectory.
This commit is contained in:
OBattler
268
src/NETWORK/pcap_if.c
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268
src/NETWORK/pcap_if.c
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/*
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* 86Box A hypervisor and IBM PC system emulator that specializes in
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* running old operating systems and software designed for IBM
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* PC systems and compatibles from 1981 through fairly recent
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* system designs based on the PCI bus.
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*
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* This file is part of the 86Box distribution.
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*
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* Simple program to show usage of WinPcap.
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*
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* Based on the "libpcap" examples.
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*
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* Version: @(#)pcap_if.c 1.0.3 2017/06/04
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*
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* Author: Fred N. van Kempen, <decwiz@yahoo.com>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <ctype.h>
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#include <pcap.h>
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#include "plat_dynld.h"
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static void *pcap_handle; /* handle to WinPcap DLL */
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/* Pointers to the real functions. */
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static int (*f_pcap_findalldevs)(pcap_if_t **,char *);
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static void (*f_pcap_freealldevs)(pcap_if_t *);
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static pcap_t *(*f_pcap_open_live)(const char *,int,int,int,char *);
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static int (*f_pcap_next_ex)(pcap_t*,struct pcap_pkthdr**,const unsigned char**);
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static void (*f_pcap_close)(pcap_t *);
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static dllimp_t pcap_imports[] = {
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{ "pcap_findalldevs", &f_pcap_findalldevs },
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{ "pcap_freealldevs", &f_pcap_freealldevs },
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{ "pcap_open_live", &f_pcap_open_live },
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{ "pcap_next_ex", &f_pcap_next_ex },
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{ "pcap_close", &f_pcap_close },
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{ NULL, NULL },
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};
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typedef struct {
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char device[128];
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char description[128];
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} dev_t;
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/* Retrieve an easy-to-use list of devices. */
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static int
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get_devlist(dev_t *list)
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{
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char errbuf[PCAP_ERRBUF_SIZE];
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pcap_if_t *devlist, *dev;
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int i = 0;
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/* Retrieve the device list from the local machine */
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if (f_pcap_findalldevs(&devlist, errbuf) == -1) {
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fprintf(stderr,"Error in pcap_findalldevs_ex: %s\n", errbuf);
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return(-1);
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}
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for (dev=devlist; dev!=NULL; dev=dev->next) {
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strcpy(list->device, dev->name);
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if (dev->description)
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strcpy(list->description, dev->description);
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else
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memset(list->description, '\0', sizeof(list->description));
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list++;
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i++;
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}
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/* Release the memory. */
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f_pcap_freealldevs(devlist);
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return(i);
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}
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/* Simple HEXDUMP routine for raw data. */
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static void
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hex_dump(unsigned char *bufp, int len)
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{
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char asci[20];
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unsigned char c;
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long addr;
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addr = 0;
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while (len-- > 0) {
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c = bufp[addr];
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if ((addr % 16) == 0)
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printf("%04x %02x", addr, c);
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else
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printf(" %02x", c);
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asci[(addr & 15)] = (uint8_t)isprint(c) ? c : '.';
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if ((++addr % 16) == 0) {
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asci[16] = '\0';
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printf(" | %s |\n", asci);
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}
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}
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if (addr % 16) {
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while (addr % 16) {
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printf(" ");
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asci[(addr & 15)] = ' ';
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addr++;
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}
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asci[16] = '\0';
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printf(" | %s |\n", asci);
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}
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}
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/* Print a standard Ethernet MAC address. */
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static void
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eth_praddr(unsigned char *ptr)
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{
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printf("%02x:%02x:%02x:%02x:%02x:%02x",
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ptr[0], ptr[1], ptr[2], ptr[3], ptr[4], ptr[5]);
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}
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/* Print a standard Ethernet header. */
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static int
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eth_prhdr(unsigned char *ptr)
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{
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unsigned short type;
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printf("Ethernet ");
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eth_praddr(ptr+6);
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printf(" > ");
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eth_praddr(ptr);
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type = (ptr[12] << 8) | ptr[13];
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printf(" type %04x\n", type);
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return(14);
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}
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/* Capture packets from the network, and print them. */
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static int
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start_cap(char *dev)
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{
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char temp[PCAP_ERRBUF_SIZE];
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struct pcap_pkthdr *hdr;
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const unsigned char *pkt;
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struct tm *ltime;
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time_t now;
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pcap_t *pcap;
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int rc;
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/* Open the device for reading from it. */
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pcap = f_pcap_open_live(dev,
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1518, /* MTU */
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1, /* promisc mode */
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10, /* timeout */
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temp);
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if (pcap == NULL) {
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fprintf(stderr, "Pcap: open_live(%s): %s\n", dev, temp);
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return(2);
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}
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printf("Listening on '%s'..\n", dev);
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for (;;) {
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rc = f_pcap_next_ex(pcap, &hdr, &pkt);
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if (rc < 0) break;
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/* Did we time out? */
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if (rc == 0) continue;
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/* Convert the timestamp to readable format. */
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now = hdr->ts.tv_sec;
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ltime = localtime(&now);
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strftime(temp, sizeof(temp), "%H:%M:%S", ltime);
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/* Process and print the packet. */
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printf("\n<< %s,%.6d len=%d\n",
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temp, hdr->ts.tv_usec, hdr->len);
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rc = eth_prhdr((unsigned char *)pkt);
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hex_dump((unsigned char *)pkt+rc, hdr->len-rc);
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}
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/* All done, close up. */
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f_pcap_close(pcap);
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return(0);
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}
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/* Show a list of available network interfaces. */
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static void
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show_devs(dev_t *list, int num)
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{
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int i;
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if (num > 0) {
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printf("Available network interfaces:\n\n");
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for (i=0; i<num; i++) {
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printf(" %d - %s\n", i+1, list->device);
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if (list->description[0] != '\0')
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printf(" (%s)\n", list->description);
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else
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printf(" (No description available)\n");
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list++;
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printf("\n");
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}
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} else {
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printf("No interfaces found!\nMake sure WinPcap is installed.\n");
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}
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}
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void
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pclog(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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}
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int
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main(int argc, char **argv)
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{
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dev_t interfaces[32];
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dev_t *dev = interfaces;
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int numdev, i;
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/* Try loading the DLL. */
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pcap_handle = dynld_module("wpcap.dll", pcap_imports);
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if (pcap_handle == NULL) {
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fprintf(stderr, "Unable to load WinPcap DLL !\n");
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return(1);
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}
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/* Get the list. */
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numdev = get_devlist(interfaces);
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if (argc == 1) {
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/* No arguments, just show the list. */
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show_devs(interfaces, numdev);
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dynld_close(pcap_handle);
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return(numdev);
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}
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/* Assume argument to be the interface number to listen on. */
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i = atoi(argv[1]);
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if (i < 0 || i > numdev) {
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fprintf(stderr, "Invalid interface number %d !\n", i);
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dynld_close(pcap_handle);
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return(1);
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}
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/* Looks good, go and listen.. */
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i = start_cap(interfaces[i-1].device);
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dynld_close(pcap_handle);
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return(i);
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}
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