## STUN Constants STUN Constants — STUN constants |

## Stability Level

Stable, unless otherwise indicated

## Types and Values

#define | STUN_AGENT_MAX_SAVED_IDS
#define | STUN_AGENT_MAX_UNKNOWN_ATTRIBUTES
#define | STUN_ATTRIBUTE_HEADER_LENGTH
#define | STUN_ATTRIBUTE_LENGTH_LEN
#define | STUN_ATTRIBUTE_LENGTH_POS
#define | STUN_ATTRIBUTE_TYPE_LEN
#define | STUN_ATTRIBUTE_TYPE_POS
#define | STUN_ATTRIBUTE_VALUE_POS
#define | STUN_ID_LEN
#define | STUN_MAGIC_COOKIE
#define | STUN_MAX_MESSAGE_SIZE
#define | STUN_MAX_MESSAGE_SIZE_IPV4
#define | STUN_MAX_MESSAGE_SIZE_IPV6
#define | STUN_MESSAGE_ATTRIBUTES_POS
#define | STUN_MESSAGE_HEADER_LENGTH
#define | STUN_MESSAGE_LENGTH_LEN
#define | STUN_MESSAGE_LENGTH_POS
#define | STUN_MESSAGE_TRANS_ID_LEN
#define | STUN_MESSAGE_TRANS_ID_POS
#define | STUN_MESSAGE_TYPE_LEN
#define | STUN_MESSAGE_TYPE_POS
#define | TURN_MAGIC_COOKIE

## Includes

    #include <stun/constants.h>

## Description

Various constants defining parts of the STUN and TURN protocols and on-the-wire packet formats.

## Functions

## Types and Values

### STUN_AGENT_MAX_SAVED_IDS

    #define STUN_AGENT_MAX_SAVED_IDS 200

Maximum number of simultaneously ongoing STUN transactions.

### STUN_AGENT_MAX_UNKNOWN_ATTRIBUTES

    #define STUN_AGENT_MAX_UNKNOWN_ATTRIBUTES 256

Maximum number of unknown attribute which can be handled in a single STUN message.

### STUN_ATTRIBUTE_HEADER_LENGTH

    #define STUN_ATTRIBUTE_HEADER_LENGTH STUN_ATTRIBUTE_VALUE_POS

Length of a single STUN attribute header (in bytes).

### STUN_ATTRIBUTE_LENGTH_LEN

    #define STUN_ATTRIBUTE_LENGTH_LEN 2

Length of the length field of a STUN attribute (in bytes).

### STUN_ATTRIBUTE_LENGTH_POS

    #define             STUN_ATTRIBUTE_LENGTH_POS

Offset of the length field of a STUN attribute (in bytes).

### STUN_ATTRIBUTE_TYPE_LEN

    #define STUN_ATTRIBUTE_TYPE_LEN 2

Length of the type field of a STUN attribute (in bytes).

### STUN_ATTRIBUTE_TYPE_POS

    #define STUN_ATTRIBUTE_TYPE_POS 0

Offset of the type field of a STUN attribute (in bytes).

### STUN_ATTRIBUTE_VALUE_POS

    #define             STUN_ATTRIBUTE_VALUE_POS

Offset of the value field of a STUN attribute (in bytes).

### STUN_ID_LEN

    #define STUN_ID_LEN 16

Length of the ID field of a STUN message (in bytes).

### STUN_MAGIC_COOKIE

    #define STUN_MAGIC_COOKIE 0x2112A442

Magic cookie value used to identify STUN messages.

### STUN_MAX_MESSAGE_SIZE

    #define STUN_MAX_MESSAGE_SIZE 65552

The Maximum size of a STUN message

### STUN_MAX_MESSAGE_SIZE_IPV4

    #define STUN_MAX_MESSAGE_SIZE_IPV4 576

Maximum size of a STUN message sent over IPv4 (in bytes).

### STUN_MAX_MESSAGE_SIZE_IPV6

    #define STUN_MAX_MESSAGE_SIZE_IPV6 1280

Maximum size of a STUN message sent over IPv6 (in bytes).

### STUN_MESSAGE_ATTRIBUTES_POS

    #define             STUN_MESSAGE_ATTRIBUTES_POS

Offset of the attributes of a STUN message (in bytes).

### STUN_MESSAGE_HEADER_LENGTH

    #define STUN_MESSAGE_HEADER_LENGTH STUN_MESSAGE_ATTRIBUTES_POS

Total length of a STUN message header (in bytes).

### STUN_MESSAGE_LENGTH_LEN

    #define STUN_MESSAGE_LENGTH_LEN 2

Length of the length field of a STUN message (in bytes).

### STUN_MESSAGE_LENGTH_POS

    #define             STUN_MESSAGE_LENGTH_POS

Offset of the length field of a STUN message (in bytes).

### STUN_MESSAGE_TRANS_ID_LEN

    #define STUN_MESSAGE_TRANS_ID_LEN 16

Length of the transaction ID field of a STUN message (in bytes).

### STUN_MESSAGE_TRANS_ID_POS

    #define             STUN_MESSAGE_TRANS_ID_POS

Offset of the transaction ID field of a STUN message (in bytes).

### STUN_MESSAGE_TYPE_LEN

    #define STUN_MESSAGE_TYPE_LEN 2

Length of the type field of a STUN message (in bytes).

### STUN_MESSAGE_TYPE_POS

    #define STUN_MESSAGE_TYPE_POS 0

Offset of the type field of a STUN message (in bytes).

### TURN_MAGIC_COOKIE

    #define TURN_MAGIC_COOKIE 0x72c64bc6

Magic cookie value used to identify TURN messages.