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/* $Id: msgheader.h,v 1.8 2001/10/31 08:51:28 m-kasahr Exp $ */
/*
* Copyright (c) 2000 Japan Network Information Center. All rights reserved.
*
* By using this file, you agree to the terms and conditions set forth bellow.
*
* LICENSE TERMS AND CONDITIONS
*
* The following License Terms and Conditions apply, unless a different
* license is obtained from Japan Network Information Center ("JPNIC"),
* a Japanese association, Kokusai-Kougyou-Kanda Bldg 6F, 2-3-4 Uchi-Kanda,
* Chiyoda-ku, Tokyo 101-0047, Japan.
*
* 1. Use, Modification and Redistribution (including distribution of any
* modified or derived work) in source and/or binary forms is permitted
* under this License Terms and Conditions.
*
* 2. Redistribution of source code must retain the copyright notices as they
* appear in each source code file, this License Terms and Conditions.
*
* 3. Redistribution in binary form must reproduce the Copyright Notice,
* this License Terms and Conditions, in the documentation and/or other
* materials provided with the distribution. For the purposes of binary
* distribution the "Copyright Notice" refers to the following language:
* "Copyright (c) Japan Network Information Center. All rights reserved."
*
* 4. Neither the name of JPNIC may be used to endorse or promote products
* derived from this Software without specific prior written approval of
* JPNIC.
*
* 5. Disclaimer/Limitation of Liability: THIS SOFTWARE IS PROVIDED BY JPNIC
* "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 JPNIC 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 DAMAGES.
*
* 6. Indemnification by Licensee
* Any person or entities using and/or redistributing this Software under
* this License Terms and Conditions shall defend indemnify and hold
* harmless JPNIC from and against any and all judgements damages,
* expenses, settlement liabilities, cost and other liabilities of any
* kind as a result of use and redistribution of this Software or any
* claim, suite, action, litigation or proceeding by any third party
* arising out of or relates to this License Terms and Conditions.
*
* 7. Governing Law, Jurisdiction and Venue
* This License Terms and Conditions shall be governed by and and
* construed in accordance with the law of Japan. Any person or entities
* using and/or redistributing this Software under this License Terms and
* Conditions hereby agrees and consent to the personal and exclusive
* jurisdiction and venue of Tokyo District Court of Japan.
*/
#ifndef MDN_MSGHEADER_H
#define MDN_MSGHEADER_H 1
/*
* DNS message header parsing/construction.
*/
#include <mdn/result.h>
/*
* Parsed DNS message header.
*/
typedef struct mdn_msgheader {
unsigned int id;
int qr;
int opcode;
int flags;
int rcode;
unsigned int qdcount;
unsigned int ancount;
unsigned int nscount;
unsigned int arcount;
} mdn_msgheader_t;
/*
* Parse DNS message header into mdn_msgheader_t type.
*
* Returns:
* mdn_success -- ok.
* mdn_invalid_message -- message is too short.
*/
extern mdn_result_t
mdn_msgheader_parse(const char *msg, size_t msglen, mdn_msgheader_t *parsed);
/*
* Pack mdn_msgheader_t data.
*
* Returns:
* mdn_success -- ok.
* mdn_buffer_overflow -- output buffer is too small.
*/
extern mdn_result_t
mdn_msgheader_unparse(mdn_msgheader_t *parsed, char *msg, size_t msglen);
/*
* Convenient functions.
*
* They do not check the length of the message. Caller must make sure
* the message is not smaller than the header size (12 octets).
*/
extern unsigned int mdn_msgheader_getid(const char *msg);
extern void mdn_msgheader_setid(char *msg, unsigned int id);
#endif /* MDN_MSGHEADER_H */
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