rtsp.h

/**
   RTSP dissector

   decoder: parsing and classification of traffic
   Copyright (C) 2016-2019 Michele Campus <michelecampus5@gmail.com>

   Based on code from https://github.com/moonlight-stream/moonlight-common-c/blob/master/src/RtspParser.c

   This file is part of decoder.

   decoder is free software: you can redistribute it and/or modify it under the
   terms of the GNU General Public License as published by the Free Software
   Foundation, either version 3 of the License, or (at your option) any later
   version.

   decoder is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE. See the GNU General Public License for more details.

   You should have received a copy of the GNU General Public License along with
   decoder. If not, see <http://www.gnu.org/licenses/>.
**/
#ifndef RTSP_H
#define RTSP_H

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define RTSP_SUCCESS          0
#define RTSP_ERROR_NO_MEMORY -1
#define RTSP_ERROR_MALFORMED -2

#define MAGIC 0x24

/**
   :: RTSP message type ::
   There are two types of message:
   - Request (from Client to Server)
   - Response (from Server to Client)
**/
#define REQUEST  0
#define RESPONSE 1

/**
   :: Command definition::
   The command token indicates the method to be performed on the resource
   identified by the Request-URI
**/
/*
  command           direction        object     requirement
  DESCRIBE          C->S             P,S        recommended
  ANNOUNCE          C->S, S->C       P,S        optional
  GET_PARAMETER     C->S, S->C       P,S        optional
  OPTIONS           C->S, S->C       P,S        required (S->C: optional)
  PAUSE             C->S             P,S        recommended
  PLAY              C->S             P,S        required
  RECORD            C->S             P,S        optional
  REDIRECT          S->C             P,S        optional
  SETUP             C->S             S          required
  SET_PARAMETER     C->S, S->C       P,S        optional
  TEARDOWN          C->S             P,S        required
*/

/**
   :: Header Field Definitions ::
   Summary of the header fields used by RTSP (RFC 2326 RTSP 1.0)
   - type "g" designates general request headers to be found in both requests and responses
   - type "R" designates request headers
   - type "r" designates response headers
   - type "e" designates entity header fields
**/
/*
   Header               type   support   methods
   Accept               R      opt.      entity
   Accept-Encoding      R      opt.      entity
   Accept-Language      R      opt.      all
   Allow                r      opt.      all
   Authorization        R      opt.      all
   Bandwidth            R      opt.      all
   Blocksize            R      opt.      all but OPTIONS, TEARDOWN
   Cache-Control        g      opt.      SETUP
   Conference           R      opt.      SETUP
   Connection           g      req.      all
   Content-Base         e      opt.      entity
   Content-Encoding     e      req.      SET_PARAMETER
   Content-Encoding     e      req.      DESCRIBE, ANNOUNCE
   Content-Language     e      req.      DESCRIBE, ANNOUNCE
   Content-Length       e      req.      SET_PARAMETER, ANNOUNCE
   Content-Length       e      req.      entity
   Content-Location     e      opt.      entity
   Content-Type         e      req.      SET_PARAMETER, ANNOUNCE
   Content-Type         r      req.      entity
   CSeq                 g      req.      all
   Date                 g      opt.      all
   Expires              e      opt.      DESCRIBE, ANNOUNCE
   From                 R      opt.      all
   If-Modified-Since    R      opt.      DESCRIBE, SETUP
   Last-Modified        e      opt.      entity
   Proxy-Authenticate
   Proxy-Require        R      req.      all
   Public               r      opt.      all
   Range                R      opt.      PLAY, PAUSE, RECORD
   Range                r      opt.      PLAY, PAUSE, RECORD
   Referer              R      opt.      all
   Require              R      req.      all
   Retry-After          r      opt.      all
   RTP-Info             r      req.      PLAY
   Scale                Rr     opt.      PLAY, RECORD
   Session              Rr     req.      all but SETUP, OPTIONS
   Server               r      opt.      all
   Speed                Rr     opt.      PLAY
   Transport            Rr     req.      SETUP
   Unsupported          r      req.      all
   User-Agent           R      opt.      all
   Via                  g      opt.      all
   WWW-Authenticate     r      opt.      all
*/


typedef struct _RTSP_MESSAGE {
    char *cache_control; //
    char *content_base; //
    char *content_len; //
    char *content_type; //
    char *command; //
    char *last_mod;
    char *range;
    char *protocol;
    char *seq_num; //
    char *server; //
    char *session; //
    char *status_code; //
    char *transport; //
    char *ua; //
    char *uri; //
    char msg_type;
    /* list not complete: add new in needed */
    char *sdp;
} rtsp_message;


/* Prototype of functions */
int rtsp_parser(const u_char *packet, int size_payload, char *json_buffer, int buffer_len);
int rtsp_message_parser(rtsp_message *msg, char *rtspMessage, int length);
void create_rtsp_message(rtsp_message *msg, char *protocol, char *uri, char *command, char *seq_num,
                         char *status_code, char *server, char *ua, char *cache_control, char *content_len,
                         char *content_type, char *content_base, char *last_mod, char *range, char *session,
                         char *transport, char msg_type, char *sdp);

#endif