#include <unistd.h>
#include <pcap/pcap.h>
#include "packet_priv.h"

static void packet_handler(u_char *user, const struct pcap_pkthdr *h, const u_char *bytes)
{
    struct packet pkt;
    packet_parse(&pkt, (const char *)bytes, h->caplen);
    packet_print_table(&pkt);
}

static void usage(char *cmd)
{
    printf("Usage: %s\n", cmd);
    printf("Options:\n");
    printf("  -f <pcap file>    pcap file\n");
    printf("  -h                print help\n");
    printf("\n");
}

int main(int argc, char **argv)
{
    int opt = 0;
    char *file = NULL;
    while ((opt = getopt(argc, argv, "f:h")) != -1)
    {
        switch (opt)
        {
        case 'f':
            file = optarg;
            break;
        case 'h':
            usage(argv[0]);
            return 0;
        default:
            usage(argv[0]);
            return -1;
        }
    }

    if (file == NULL)
    {
        usage(argv[0]);
        return -1;
    }

    pcap_t *pcap = pcap_open_offline(file, NULL);
    if (pcap == NULL)
    {
        printf("pcap_open_offline() failed\n");
        return -1;
    }
    pcap_loop(pcap, -1, packet_handler, NULL);
    pcap_close(pcap);

    return 0;
}