/**
* @brief Feed a list packets into an eBPF program.
* @details This is a mock function emulating the behavior of a running
* eBPF program. It takes a list of input packets and iteratively parses them
* using the given imported ebpf_filter function. The output defines whether
* or not the packet is "dropped." If the packet is not dropped, its content is
* copied and appended to an output packet list.
*
* @param pkt_list A list of input packets running through the filter.
* @return The list of packets "surviving" the filter function
*/
pcap_list_t *feed_packets(packet_filter ebpf_filter, pcap_list_t *pkt_list, int debug) {
pcap_list_t *output_pkts = allocate_pkt_list();
uint32_t list_len = get_pkt_list_length(pkt_list);
for (uint32_t i = 0; i < list_len; i++) {
/* Parse each packet in the list and check the result */
struct sk_buff skb;
pcap_pkt *input_pkt = get_packet(pkt_list, i);
skb.data = (void *) input_pkt->data;
skb.len = input_pkt->pcap_hdr.len;
int result = ebpf_filter(&skb);
if (result != 0) {
/* We copy the entire content to emulate an outgoing packet */
pcap_pkt *out_pkt = copy_pkt(input_pkt);
output_pkts = append_packet(output_pkts, out_pkt);
}
if (debug)
printf("Result of the eBPF parsing is: %d\n", result);
}
return output_pkts;
}
static void
on_ssdp_message (G_GNUC_UNUSED GSSDPClient *client,
G_GNUC_UNUSED const gchar *from_ip,
G_GNUC_UNUSED gushort from_port,
_GSSDPMessageType type,
SoupMessageHeaders *headers,
G_GNUC_UNUSED gpointer user_data)
{
time_t arrival_time;
arrival_time = time (NULL);
if (type == _GSSDP_DISCOVERY_REQUEST)
return;
if (ip_filter != NULL && strcmp (ip_filter, from_ip) != 0)
return;
if (!capture_packets)
return;
append_packet (from_ip, arrival_time, type, headers);
}
