/*-------------------------------------------
| Name:start_socketsrv_0
| Description:
| Parameters:
| Return Type:
| Comments:
| See:
---------------------------------------------*/
int start_socketsrv_0(int argc, char* argv[]){
WSADATA wsaData;
clt_sock=0;
if (ip_start(&wsaData)) {
printf("ip_start failed!");
return -1;
}
hsock_event=CreateEvent(NULL,FALSE,FALSE,NULL);
hthr = CreateThread( (LPSECURITY_ATTRIBUTES) NULL,
0,
(LPTHREAD_START_ROUTINE) tcp_srv,
NULL,
0, &thr_id);
if(!hthr)
return -1;
return 0;
}
struct packet *new_udp_packet(int address_family,
enum direction_t direction,
u16 udp_payload_bytes,
char **error)
{
struct packet *packet = NULL; /* the newly-allocated result packet */
struct header *udp_header = NULL; /* the UDP header info */
/* Calculate lengths in bytes of all sections of the packet */
const int ip_option_bytes = 0;
const int ip_header_bytes = (ip_header_min_len(address_family) +
ip_option_bytes);
const int udp_header_bytes = sizeof(struct udp);
const int ip_bytes =
ip_header_bytes + udp_header_bytes + udp_payload_bytes;
/* Sanity-check all the various lengths */
if (ip_option_bytes & 0x3) {
asprintf(error, "IP options are not padded correctly "
"to ensure IP header is a multiple of 4 bytes: "
"%d excess bytes", ip_option_bytes & 0x3);
return NULL;
}
assert((udp_header_bytes & 0x3) == 0);
assert((ip_header_bytes & 0x3) == 0);
if (ip_bytes > MAX_UDP_DATAGRAM_BYTES) {
asprintf(error, "UDP datagram too large");
return NULL;
}
/* Allocate and zero out a packet object of the desired size */
packet = packet_new(ip_bytes);
memset(packet->buffer, 0, ip_bytes);
packet->direction = direction;
packet->flags = 0;
packet->ecn = ECN_NONE;
/* Set IP header fields */
set_packet_ip_header(packet, address_family, ip_bytes,
packet->ecn, IPPROTO_UDP);
udp_header = packet_append_header(packet, HEADER_UDP,
sizeof(struct udp));
udp_header->total_bytes = udp_header_bytes + udp_payload_bytes;
/* Find the start of UDP section of the packet */
packet->udp = (struct udp *) (ip_start(packet) + ip_header_bytes);
/* Set UDP header fields */
packet->udp->src_port = htons(0);
packet->udp->dst_port = htons(0);
packet->udp->len = htons(udp_header_bytes + udp_payload_bytes);
packet->udp->check = 0;
packet->ip_bytes = ip_bytes;
return packet;
}