stunnel: Protocol

SESSIOND PROTOCOL VERSION 1 DESCRIPTION

  1. Request Message Types
    #define CACHE_CMD_NEW     0x00
    #define CACHE_CMD_GET     0x01
    #define CACHE_CMD_REMOVE  0x02
    
  2. Response Message Types
    #define CACHE_RESP_ERR    0x80
    #define CACHE_RESP_OK     0x81
    
  3. Message (UDP Packet) Format Syntax
    typedef struct {
        u_char version, type;
        u_short timeout;
        u_char key[32];
        u_char val[512];
    } CACHE_PACKET;
    
    version : always 1
    type    : message (request/response) type as decribed above
    timeout : SSL session timeout in network byte order
    key     : SSL session ID
    val     : DER encoded session
    
  4. Lengths of Fields

    The length of "key" is always 32 bytes. The value is right-padded with zeros.
    The length of "val" is computed based on the UDP packet size.

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