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122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
/*
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* rtp_decoder.h
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*
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* decoder structures and functions for SRTP pcap decoder
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*
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* Bernardo Torres <bernardo@torresautomacao.com.br>
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*
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* Some structure and code from https://github.com/gteissier/srtp-decrypt
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*
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*/
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/*
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*
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* Copyright (c) 2001-2017 Cisco Systems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef RTP_DECODER_H
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#define RTP_DECODER_H
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#include "srtp_priv.h"
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#include "rtp.h"
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#define DEFAULT_RTP_OFFSET 42
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typedef enum {
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mode_rtp = 0,
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mode_rtcp,
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mode_rtcp_mux,
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} rtp_decoder_mode_t;
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typedef struct rtp_decoder_ctx_t {
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srtp_policy_t policy;
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srtp_ctx_t *srtp_ctx;
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rtp_decoder_mode_t mode;
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int rtp_offset;
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struct timeval start_tv;
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int frame_nr;
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int error_cnt;
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int rtp_cnt;
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int rtcp_cnt;
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} rtp_decoder_ctx_t;
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typedef struct rtp_decoder_ctx_t *rtp_decoder_t;
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/*
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* error to string
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*/
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void rtp_print_error(srtp_err_status_t status, char *message);
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/*
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* prints the output of a random buffer in hexadecimal
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*/
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void hexdump(const void *ptr, size_t size);
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/*
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* the function usage() prints an error message describing how this
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* program should be called, then calls exit()
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*/
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void usage(char *prog_name);
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/*
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* transforms base64 key into octet
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*/
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char *decode_sdes(char *in, char *out);
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/*
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* pcap handling
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*/
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void rtp_decoder_handle_pkt(u_char *arg,
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const struct pcap_pkthdr *hdr,
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const u_char *bytes);
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rtp_decoder_t rtp_decoder_alloc(void);
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void rtp_decoder_dealloc(rtp_decoder_t rtp_ctx);
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int rtp_decoder_init(rtp_decoder_t dcdr,
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srtp_policy_t policy,
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rtp_decoder_mode_t mode,
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int rtp_packet_offset);
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int rtp_decoder_deinit(rtp_decoder_t decoder);
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void rtp_decoder_srtp_log_handler(srtp_log_level_t level,
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const char *msg,
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void *data);
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void rtp_decoder_srtp_log_handler(srtp_log_level_t level,
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const char *msg,
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void *data);
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#endif /* RTP_DECODER_H */
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