mirror of
https://code.semirocket.science/wrapsix
synced 2024-11-10 08:10:59 +02:00
4bc68edce5
Written new mechanism of wrapper from scratch in C * It listens to all ICMPv6 packets (for now) and translates them to ICMPv4 ones * It can compute the checksum of the packet as well
74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
#include "wrapper.h"
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int main(int argc, char **argv)
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{
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char *dev = NULL; /* capture device name */
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char errbuf[PCAP_ERRBUF_SIZE]; /* error buffer */
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pcap_t *handle; /* packet capture handle */
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//char filter_exp[] = "ip6"; /* filter expression */
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char filter_exp[] = "icmp6"; /* filter expression */
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struct bpf_program fp; /* compiled filter program (expression) */
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bpf_u_int32 mask; /* subnet mask */
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bpf_u_int32 net; /* ip */
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int num_packets = 0; /* number of packets to capture */
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/* find a capture device */
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dev = pcap_lookupdev(errbuf);
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if (dev == NULL) {
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fprintf(stderr, "Couldn't find default device: %s\n", errbuf);
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exit(EXIT_FAILURE);
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}
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/* get network number and mask associated with capture device */
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if (pcap_lookupnet(dev, &net, &mask, errbuf) == -1) {
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fprintf(stderr, "Couldn't get netmask for device %s: %s\n", dev, errbuf);
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net = 0;
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mask = 0;
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}
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/* print capture info */
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printf("Device: %s\n", dev);
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printf("Number of packets: %d\n", num_packets);
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printf("Filter expression: %s\n", filter_exp);
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/* open capture device */
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handle = pcap_open_live(dev, SNAP_LEN, 1, 1, errbuf);
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if (handle == NULL) {
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fprintf(stderr, "Couldn't open device %s: %s\n", dev, errbuf);
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exit(EXIT_FAILURE);
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}
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/* make sure we're capturing on an Ethernet device */
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if (pcap_datalink(handle) != DLT_EN10MB) {
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fprintf(stderr, "%s is not an Ethernet\n", dev);
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exit(EXIT_FAILURE);
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}
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/* compile the filter expression */
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if (pcap_compile(handle, &fp, filter_exp, 0, net) == -1) {
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fprintf(stderr, "Couldn't parse filter %s: %s\n",
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filter_exp, pcap_geterr(handle));
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exit(EXIT_FAILURE);
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}
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/* apply the compiled filter */
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if (pcap_setfilter(handle, &fp) == -1) {
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fprintf(stderr, "Couldn't install filter %s: %s\n",
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filter_exp, pcap_geterr(handle));
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exit(EXIT_FAILURE);
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}
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/* now we can set our callback function */
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pcap_loop(handle, num_packets, process_packet6, NULL);
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/* cleanup */
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pcap_freecode(&fp);
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pcap_close(handle);
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printf("\nCapture complete.\n");
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return 0;
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}
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