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/*
* rtp_decoder.h
*
* decoder structures and functions for SRTP pcap decoder
*
* Bernardo Torres <bernardo@torresautomacao.com.br>
*
* Some structure and code from https://github.com/gteissier/srtp-decrypt
*
*/
/*
*
* Copyright (c) 2001-2017 Cisco Systems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* Neither the name of the Cisco Systems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef RTP_DECODER_H
#define RTP_DECODER_H
#include "srtp_priv.h"
#include "rtp.h"
#define DEFAULT_RTP_OFFSET 42
typedef struct rtp_decoder_ctx_t {
srtp_policy_t policy;
srtp_ctx_t *srtp_ctx;
int rtp_offset;
struct timeval start_tv;
int frame_nr;
rtp_msg_t message;
} rtp_decoder_ctx_t;
typedef struct rtp_decoder_ctx_t *rtp_decoder_t;
/*
* error to string
*/
void rtp_print_error(srtp_err_status_t status, char *message);
/*
* prints the output of a random buffer in hexadecimal
*/
void hexdump(const void *ptr, size_t size);
/*
* the function usage() prints an error message describing how this
* program should be called, then calls exit()
*/
void usage(char *prog_name);
/*
* transforms base64 key into octet
*/
char *decode_sdes(char *in, char *out);
/*
* pcap handling
*/
void rtp_decoder_handle_pkt(u_char *arg,
const struct pcap_pkthdr *hdr,
const u_char *bytes);
rtp_decoder_t rtp_decoder_alloc(void);
void rtp_decoder_dealloc(rtp_decoder_t rtp_ctx);
int rtp_decoder_init(rtp_decoder_t dcdr, srtp_policy_t policy);
srtp_err_status_t rtp_decoder_init_srtp(rtp_decoder_t decoder,
unsigned int ssrc);
int rtp_decoder_deinit_srtp(rtp_decoder_t decoder);
#endif /* RTP_DECODER_H */
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