Programming Forums - Trying to make a simple packet sniffer

So this is my first time out with libpcap. And sadly this is not compiling:

#include <stdio.h>

#include <pcap.h>



#define NUM_PACKETS 10



void pcap_handler_cb(u_char *user, const struct pcap_pkthdr *pkt_header, const u_char *pkt_data)

{

        printf("Got packet: %d bytes captured:", pkt_header->caplen);

        if (pkt_header->caplen > 2)

                printf("%02X %02X ... \n", pkt_data[0], pkt_data[1]);

        else

                printf("...\n");

}



int main(int argc, char *argv[])

{

        char errbuf[PCAP_ERRBUF_SIZE];

        char *default_device;

        pcap_t* ph;

        default_device = pcap_lookupdev(errbuf);

        if (!default_device)

        {

                fprintf(stderr, "%s\n", errbuf);

                exit(1);

        }

        printf("Opening %s\n", default_device);

        ph = pcap_open_live(default_device, BUFSIZ, 1, 0, errbuf);

        printf("Capturing on %s\n", default_device);

        pcap_loop(ph, NUM_PACKETS, pcap_handler_cb, NULL);

        printf("Done.\n");

        return 0;

}

And when I try to compile it I get this:

Quote:

Originally Posted by my terminal

intimidat0r@gibson:~$ cc simpsniff.c
simpsniff.c: In function �main�:
simpsniff.c:24: warning: incompatible implicit declaration of built-in function �exit�
/tmp/ccCQpoev.o: In function `main':simpsniff.c:(.text+0x89): undefined reference to `pcap_lookupdev'
:simpsniff.c:(.text+0xfe): undefined reference to `pcap_open_live'
:simpsniff.c:(.text+0x137): undefined reference to `pcap_loop'
collect2: ld returned 1 exit status
intimidat0r@gibson:~$

I used to get a lot more errors until I installed libpcap0.8 and libpcap0.8-dev. :)

Now I only get these. Any idea how to fix 'er?

Thanks.