RuhNetConsulting
/
rtpengine
mirror of https://github.com/sipwise/rtpengine


								#include "stun.h"

								#include <sys/types.h>


								struct stun {

									u_int16_t msg_type;

									u_int16_t msg_len;

									u_int32_t cookie;

									unsigned char transaction[12];

								} __attribute__ ((packed));


								int stun(const char *buf, int len) {

									const struct stun *s = (const void *) buf;

									int msglen, method, class;


									msglen = ntohs(s->msg_len);

									class = method = ntohl(s->msg_type);

									class = ((class & 0x10) >> 4) | ((class & 0x100) >> 7);

									method = (method & 0xf) | ((method & 0xe0) >> 1) | ((method & 0x3e00) >> 2);

									if (method != 0x1) /* binding */

										return -1;


									return 0;

								}