#include "internal/icmp_internal.h"
#include "internal/icmp_socket.h"
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <string.h>

/* Forward declarations */
static void handle_socket_error(struct icmp_handle *h, int err);
/* -------------------- */

int
socket_create(struct icmp_handle *h)
{
	int fd;

	/* Create raw ICMP socket */
	fd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);

	if (fd < 0)
	{
		handle_socket_error(h, errno);
		return -1;
	}

	/* Store file descriptor in handle */
	h->fd = fd;

	/* Clear error state on success */
	socket_clear_error(h);

	return 0;
}

static void
handle_socket_error(struct icmp_handle *h, int err)
{
	if (EPERM == err)
	{
		socket_set_error(h, ICMP_ERR_PERMISSION,
				"Raw socket requires CAP_NET_RAW or root");
	}
	else
	{
		socket_set_error(h, ICMP_ERR_SOCKET,
				"socket() failed: %s", strerror(err));
	}
}