stun.h

   1 #ifndef __UNETD_STUN_H
   2 #define __UNETD_STUN_H
   3
   4 #include <stdint.h>
   5 #include <stdbool.h>
   6
   7 #define STUN_MSGTYPE_BINDING_REQUEST            0x0001
   8 #define STUN_MSGTYPE_BINDING_RESPONSE           0x0101
   9 #define STUN_MSGTYPE_BINDING_ERROR              0x0111
  10 #define STUN_MSGTYPE_BINDING_INDICATION         0x0011
  11
  12 #define STUN_MSGTYPE_SHARED_SECRET_REQUEST      0x0002
  13 #define STUN_MSGTYPE_SHARED_SECRET_RESPONSE     0x0102
  14 #define STUN_MSGTYPE_SHARED_SECRET_ERROR        0x0112
  15
  16 #define STUN_MAGIC                              0x2112a442
  17
  18 enum tlv_type {
  19         STUN_TLV_MAPPED_ADDRESS =               0x01,
  20         STUN_TLV_RESPONSE_ADDRESS =             0x02,
  21         STUN_TLV_CHANGE_REQUEST =               0x03,
  22         STUN_TLV_SOURCE_ADDRESS =               0x04,
  23         STUN_TLV_CHANGED_ADDRESS =              0x05,
  24         STUN_TLV_XOR_MAPPED_ADDRESS =           0x20,
  25         STUN_TLV_RESPONSE_PORT =                0x27,
  26 };
  27
  28 struct stun_msg_hdr {
  29         uint16_t msg_type;
  30         uint16_t msg_len;
  31         uint32_t magic;
  32         uint8_t transaction[12];
  33 };
  34
  35 struct stun_msg_tlv {
  36         uint16_t type;
  37         uint16_t len;
  38 };
  39
  40 struct stun_tlv_policy {
  41         uint16_t type;
  42         uint16_t min_len;
  43 };
  44
  45 struct stun_request {
  46         uint8_t transaction[12];
  47         uint16_t port;
  48         bool pending;
  49 };
  50
  51 bool stun_msg_is_valid(const void *data, size_t len);
  52 const void *stun_msg_request_prepare(struct stun_request *req, size_t *len,
  53                                      uint16_t response_port);
  54 bool stun_msg_request_complete(struct stun_request *req, const void *data,
  55                                size_t len);
  56
  57 #endif