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Test filtering created - made for testing filtering as per tutorial.

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Alex Huddleston 2018-01-31 15:27:44 -06:00
parent b41e84e259
commit a16f7f73a1
1 changed files with 50 additions and 0 deletions
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test_filtering.cpp Normal file
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#include <stdio.h>
#include <iostream>
#include <pcap.h>
// Initalize variables.
using namespace std;
pcap_t *handle; /* Session handle */
string dev; /* Device to sniff on */
char errbuf[PCAP_ERRBUF_SIZE]; /* Error string */
struct bpf_program fp; /* The compiled filter expression */
char filter_exp[] = "port 23"; /* The filter expression */
bpf_u_int32 mask; /* The netmask of our sniffing device */
bpf_u_int32 net; /* The IP of our sniffing device */
int main()
{
char *dev, errbuf[PCAP_ERRBUF_SIZE];
dev = pcap_lookupdev(errbuf);
if (dev == NULL) {
fprintf(stderr, "Couldn't find default device: %s\n", errbuf);
return(2);
}
if(pcap_lookupnet(dev, &net, &mask, errbuf) == -1) {
fprintf(stderr, "Can't get netmask for device %s\n", dev);
net = 0;
mask = 0;
}
handle = pcap_open_live(dev, BUFSIZ, 1, 1000, errbuf);
if(handle == NULL) {
fprintf(stderr, "Couldn't open device %s: %s\n", dev, errbuf);
return(2);
}
if(pcap_compile(handle, &fp, filter_exp, 0, net) == -1) {
fprintf(stderr, "Couldn't parse filter %s: %s\n", filter_exp, pcap_geterr(handle));
return(2);
}
if(pcap_setfilter(handle, &fp) == -1) {
fprintf(stderr, "Couldn't install filter %s: %s\n", filter_exp, pcap_geterr(handle));
return(2);
}
}