Function NgSendData

tools/libnetgraph/sock.c:281–312

* Write a packet to a data socket. The packet will be sent * out the corresponding node on the specified hook. * Returns -1 if error and sets errno. */

 * Returns -1 if error and sets errno.
 */
int
NgSendData(int ds, const char *hook, const u_char * buf, size_t len)
{
	u_char sgbuf[NG_HOOKSIZ + NGSA_OVERHEAD];
	struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
	int errnosv;

	/* Set up destination hook */
	sg->sg_family = AF_NETGRAPH;
	strlcpy(sg->sg_data, hook, NG_HOOKSIZ);
	sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;

	/* Debugging */
	if (_gNgDebugLevel >= 2) {
		NGLOGX("WRITE PACKET to hook \"%s\" (%d bytes)", hook, len);
		_NgDebugSockaddr(sg);
		if (_gNgDebugLevel >= 3)
			_NgDebugBytes(buf, len);
	}

	/* Send packet */
	if (sendto(ds, buf, len, 0, (struct sockaddr *) sg, sg->sg_len) < 0) {
		errnosv = errno;
		if (_gNgDebugLevel >= 1)
			NGLOG("sendto(%s)", sg->sg_data);
		errno = errnosv;
		return (-1);
	}

	/* Done */
	return (0);
}