134 lines
5.9 KiB
C
134 lines
5.9 KiB
C
/* packet-rtp.h
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*
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* Routines for RTP dissection
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* RTP = Real time Transport Protocol
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*
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* $Id$
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*
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* Copyright 2000, Philips Electronics N.V.
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* Written by Andreas Sikkema <andreas.sikkema@philips.com>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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struct _rtp_info {
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unsigned int info_version;
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gboolean info_padding_set;
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gboolean info_marker_set;
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unsigned int info_payload_type;
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unsigned int info_padding_count;
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guint16 info_seq_num;
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guint32 info_timestamp;
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guint32 info_sync_src;
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guint info_data_len; /* length of raw rtp data as reported */
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gboolean info_all_data_present; /* FALSE if data is cut off */
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guint info_payload_offset; /* start of payload relative to info_data */
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guint info_payload_len; /* length of payload (incl padding) */
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gboolean info_is_srtp;
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guint32 info_setup_frame_num; /* the frame num of the packet that set this RTP connection */
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const guint8* info_data; /* pointer to raw rtp data */
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gchar *info_payload_type_str;
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/*
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* info_data: pointer to raw rtp data = header + payload incl. padding.
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* That should be safe because the "epan_dissect_t" constructed for the packet
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* has not yet been freed when the taps are called.
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* (destroying the "epan_dissect_t" will end up freeing all the tvbuffs
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* and hence invalidating pointers to their data).
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* See "add_packet_to_packet_list()" for details.
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*/
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};
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/* definitions for SRTP dissection */
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/* Encryption algorithms */
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#define SRTP_ENC_ALG_NULL 0 /* non-encrypted SRTP payload - may still be authenticated */
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#define SRTP_ENC_ALG_AES_CM 1 /* SRTP default algorithm */
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#define SRTP_ENC_ALG_AES_F8 2
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/* Authentication algorithms */
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#define SRTP_AUTH_ALG_NONE 0 /* no auth tag in SRTP/RTP payload */
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#define SRTP_AUTH_ALG_HMAC_SHA1 1 /* SRTP default algorithm */
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#if 0 /* these are only needed once the dissector include the crypto functions to decrypt and/or authenticate */
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struct srtp_key_info
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{
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guint8 *master_key; /* pointer to an se_alloc'ed master key */
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guint8 *master_salt; /* pointer to an se_alloc'ed salt for this master key - NULL if no salt */
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guint8 key_generation_rate; /* encoded as the power of 2, 0..24, or 255 (=zero rate) */
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/* Either the MKI value is used (in which case from=to=0), or the <from,to> values are used (and MKI=0) */
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guint32 from_roc; /* 32 MSBs of a 48 bit value - frame from which this key is valid (roll-over counter part) */
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guint16 from_seq; /* 16 LSBs of a 48 bit value - frame from which this key is valid (sequence number part) */
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guint32 to_roc; /* 32 MSBs of a 48 bit value - frame to which this key is valid (roll-over counter part) */
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guint16 to_seq; /* 16 LSBs of a 48 bit value - frame to which this key is valid (sequence number part) */
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guint32 mki; /* the MKI value associated with this key */
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};
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#endif
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struct srtp_info
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{
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guint encryption_algorithm; /* at present only NULL vs non-NULL matter */
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guint auth_algorithm; /* at present only NULL vs non-NULL matter */
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guint mki_len; /* number of octets used for the MKI in the RTP payload */
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guint auth_tag_len; /* number of octets used for the Auth Tag in the RTP payload */
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#if 0 /* these are only needed once the dissector include the crypto functions to decrypt and/or authenticate */
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struct srtp_key_info **master_keys; /* an array of pointers to master keys and their info, the array and each key struct being se_alloc'ed */
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void *enc_alg_info, /* algorithm-dependent info struct - may be void for default alg with default params */
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void *auth_alg_info /* algorithm-dependent info struct - void for default alg with default params */
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#endif
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};
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/* Info to save in RTP conversation / packet-info */
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#define MAX_RTP_SETUP_METHOD_SIZE 7
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struct _rtp_conversation_info
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{
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gchar method[MAX_RTP_SETUP_METHOD_SIZE + 1];
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guint32 frame_number; /* the frame where this conversation is started */
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GHashTable *rtp_dyn_payload; /* a hash table with the dynamic RTP payload */
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guint32 extended_seqno; /* the sequence number, extended to a 32-bit
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* int to guarantee it increasing monotonically
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*/
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struct _rtp_private_conv_info *rtp_conv_info; /* conversation info private
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* to the rtp dissector */
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struct srtp_info *srtp_info; /* SRTP context */
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};
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/* Add an RTP conversation with the given details */
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void rtp_add_address(packet_info *pinfo,
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address *addr, int port,
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int other_port,
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const gchar *setup_method,
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guint32 setup_frame_number,
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GHashTable *rtp_dyn_payload);
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/* Add an SRTP conversation with the given details */
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void srtp_add_address(packet_info *pinfo,
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address *addr, int port,
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int other_port,
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const gchar *setup_method,
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guint32 setup_frame_number,
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GHashTable *rtp_dyn_payload,
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struct srtp_info *srtp_info);
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/* Free and destroy the dyn_payload hash table */
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void rtp_free_hash_dyn_payload(GHashTable *rtp_dyn_payload);
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