kopia lustrzana https://github.com/F5OEO/tstools
132 wiersze
2.6 KiB
C
132 wiersze
2.6 KiB
C
/* ipv4.h */
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/*
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* Routines for dissecting IPv4 and UDP packets.
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the MPEG TS, PS and ES tools.
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*
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* The Initial Developer of the Original Code is Amino Communications Ltd.
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* Portions created by the Initial Developer are Copyright (C) 2008
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Richard Watts, Kynesim <rrw@kynesim.co.uk>
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*
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* ***** END LICENSE BLOCK *****
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*/
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#ifndef _ipv4_h
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#define _ipv4_h
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#include "compat.h"
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/*! This is all held in host byte order (including the
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* IP addresses! You have been warned .. )
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*/
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typedef struct ipv4_header_s
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{
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// IP version. Should really be 4 :-)
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uint8_t version;
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// Header length.
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uint8_t hdr_length;
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// Type of service.
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uint8_t serv_type;
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//! Total length
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uint16_t length;
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//! Ident
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uint16_t ident;
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//! Flags
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uint8_t flags;
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//! Frag offset.
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uint16_t frag_offset;
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//! TTL
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uint8_t ttl;
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//! Protocol (typically UDP or TCP)
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uint8_t proto;
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//! Header checksum (we don't check this!)
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uint16_t csum;
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//! Source address.
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uint32_t src_addr;
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//! Destination address.
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uint32_t dest_addr;
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//! We don't track options.
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} ipv4_header_t;
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// Is this header UDP?
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#define IPV4_HDR_IS_UDP(h) ((h)->proto == 17)
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#define IPV4_ERR_PKT_TOO_SHORT (-1)
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/*!
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* Unwrap ipv4.
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*
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* \param out_st OUT Index into data at which IPv4 payload starts.
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* \param out_len OUT Length of the IPv4 payload.
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* \return 0 on success, -1 on failure.
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*/
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int ipv4_from_payload(const uint8_t *data,
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const uint32_t len,
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ipv4_header_t *out_hdr,
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uint32_t *out_st,
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uint32_t *out_len);
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typedef struct ipv4_udp_header_s
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{
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//! Source port.
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uint16_t source_port;
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//! Dest port.
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uint16_t dest_port;
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//! Length (yes, yet another one!)
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uint16_t length;
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//! Checksum
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uint16_t csum;
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} ipv4_udp_header_t;
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/*!
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* Unwrap UDP.
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*
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*/
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int ipv4_udp_from_payload(const uint8_t *data,
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const uint32_t len,
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ipv4_udp_header_t *out_hdr,
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uint32_t *out_st,
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uint32_t *out_len);
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#endif
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/* End file */
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