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File: [cvs.NetBSD.org] / src / lib / libc / nameser / ns_parse.c (download)

Revision 1.9, Tue Mar 13 21:13:39 2012 UTC (8 years, 8 months ago) by christos
Branch: MAIN
CVS Tags: yamt-pagecache-base9, yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, yamt-pagecache-base5, yamt-pagecache-base4, tls-maxphys-base, tls-maxphys, tls-earlyentropy-base, tls-earlyentropy, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, phil-wifi-base, phil-wifi-20200421, phil-wifi-20200411, phil-wifi-20200406, phil-wifi-20191119, phil-wifi-20190609, phil-wifi, pgoyette-localcount-base, pgoyette-localcount-20170426, pgoyette-localcount-20170320, pgoyette-localcount-20170107, pgoyette-localcount-20161104, pgoyette-localcount-20160806, pgoyette-localcount-20160726, pgoyette-localcount, pgoyette-compat-merge-20190127, pgoyette-compat-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, netbsd-9-base, netbsd-9-1-RELEASE, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1, netbsd-9, netbsd-8-base, netbsd-8-2-RELEASE, netbsd-8-1-RELEASE, netbsd-8-1-RC1, netbsd-8-0-RELEASE, netbsd-8-0-RC2, netbsd-8-0-RC1, netbsd-8, netbsd-7-nhusb-base-20170116, netbsd-7-nhusb-base, netbsd-7-nhusb, netbsd-7-base, netbsd-7-2-RELEASE, netbsd-7-1-RELEASE, netbsd-7-1-RC2, netbsd-7-1-RC1, netbsd-7-1-2-RELEASE, netbsd-7-1-1-RELEASE, netbsd-7-1, netbsd-7-0-RELEASE, netbsd-7-0-RC3, netbsd-7-0-RC2, netbsd-7-0-RC1, netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE, netbsd-7-0, netbsd-7, matt-nb8-mediatek-base, matt-nb8-mediatek, localcount-20160914, is-mlppp-base, is-mlppp, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan, agc-symver-base, agc-symver, HEAD
Changes since 1.8: +5 -3 lines

PR/45989: Martin Husemann: lint invocation does include -w only on i386

- turn lint -w for all the platforms after fixing the lint warnings.
- add _DIAGASSERTS() for casts that would assign values to types that
  would not fit.
- change types, add casts
- change into ansii prototypes
- turn on _DIAGNOSTIC for libc (during current, to be eliminated for release
  builds)

approved by core@

/*	$NetBSD: ns_parse.c,v 1.9 2012/03/13 21:13:39 christos Exp $	*/

/*
 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
 * Copyright (c) 1996,1999 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/cdefs.h>
#ifndef lint
#ifdef notdef
static const char rcsid[] = "Id: ns_parse.c,v 1.10 2009/01/23 19:59:16 each Exp";
#else
__RCSID("$NetBSD: ns_parse.c,v 1.9 2012/03/13 21:13:39 christos Exp $");
#endif
#endif

/* Import. */

#include "port_before.h"

#include <sys/types.h>

#include <netinet/in.h>
#include <arpa/nameser.h>

#include <assert.h>
#include <errno.h>
#include <resolv.h>
#include <string.h>

#include "port_after.h"

/* Forward. */

static void	setsection(ns_msg *msg, ns_sect sect);

/* Macros. */

#if !defined(SOLARIS2) || defined(__COVERITY__)
#define RETERR(err) do { errno = (err); return (-1); } while (/*NOTREACHED*//*CONSTCOND*/0)
#else
#define RETERR(err) \
	do { errno = (err); if (errno == errno) return (-1); } while (0)
#endif

#define PARSE_FMT_PRESO 0	/* Parse using presentation-format names */
#define PARSE_FMT_WIRE 1	/* Parse using network-format names */

/* Public. */

/* These need to be in the same order as the nres.h:ns_flag enum. */
struct _ns_flagdata _ns_flagdata[16] = {
	{ 0x8000, 15 },		/*%< qr. */
	{ 0x7800, 11 },		/*%< opcode. */
	{ 0x0400, 10 },		/*%< aa. */
	{ 0x0200, 9 },		/*%< tc. */
	{ 0x0100, 8 },		/*%< rd. */
	{ 0x0080, 7 },		/*%< ra. */
	{ 0x0040, 6 },		/*%< z. */
	{ 0x0020, 5 },		/*%< ad. */
	{ 0x0010, 4 },		/*%< cd. */
	{ 0x000f, 0 },		/*%< rcode. */
	{ 0x0000, 0 },		/*%< expansion (1/6). */
	{ 0x0000, 0 },		/*%< expansion (2/6). */
	{ 0x0000, 0 },		/*%< expansion (3/6). */
	{ 0x0000, 0 },		/*%< expansion (4/6). */
	{ 0x0000, 0 },		/*%< expansion (5/6). */
	{ 0x0000, 0 },		/*%< expansion (6/6). */
};

int ns_msg_getflag(ns_msg handle, int flag) {
	return((u_int32_t)((handle)._flags & _ns_flagdata[flag].mask) >> _ns_flagdata[flag].shift);
}

int
ns_skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count) {
	const u_char *optr = ptr;

	for (; count > 0; count--) {
		int b, rdlength;

		b = dn_skipname(ptr, eom);
		if (b < 0)
			RETERR(EMSGSIZE);
		ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/;
		if (section != ns_s_qd) {
			if (ptr + NS_INT32SZ + NS_INT16SZ > eom)
				RETERR(EMSGSIZE);
			ptr += NS_INT32SZ/*TTL*/;
			NS_GET16(rdlength, ptr);
			ptr += rdlength/*RData*/;
		}
	}
	if (ptr > eom)
		RETERR(EMSGSIZE);
	_DIAGASSERT(__type_fit(int, ptr - optr));
	return (int)(ptr - optr);
}

int
ns_initparse(const u_char *msg, int msglen, ns_msg *handle) {
	const u_char *eom = msg + msglen;
	int i;

	handle->_msg = msg;
	handle->_eom = eom;
	if (msg + NS_INT16SZ > eom)
		RETERR(EMSGSIZE);
	NS_GET16(handle->_id, msg);
	if (msg + NS_INT16SZ > eom)
		RETERR(EMSGSIZE);
	NS_GET16(handle->_flags, msg);
	for (i = 0; i < ns_s_max; i++) {
		if (msg + NS_INT16SZ > eom)
			RETERR(EMSGSIZE);
		NS_GET16(handle->_counts[i], msg);
	}
	for (i = 0; i < ns_s_max; i++)
		if (handle->_counts[i] == 0)
			handle->_sections[i] = NULL;
		else {
			int b = ns_skiprr(msg, eom, (ns_sect)i,
					  handle->_counts[i]);

			if (b < 0)
				return (-1);
			handle->_sections[i] = msg;
			msg += b;
		}
	if (msg != eom)
		RETERR(EMSGSIZE);
	setsection(handle, ns_s_max);
	return (0);
}

int
ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) {
	int b;
	int tmp;

	/* Make section right. */
	tmp = section;
	if (tmp < 0 || section >= ns_s_max)
		RETERR(ENODEV);
	if (section != handle->_sect)
		setsection(handle, section);

	/* Make rrnum right. */
	if (rrnum == -1)
		rrnum = handle->_rrnum;
	if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
		RETERR(ENODEV);
	if (rrnum < handle->_rrnum)
		setsection(handle, section);
	if (rrnum > handle->_rrnum) {
		b = ns_skiprr(handle->_msg_ptr, handle->_eom, section,
			      rrnum - handle->_rrnum);

		if (b < 0)
			return (-1);
		handle->_msg_ptr += b;
		handle->_rrnum = rrnum;
	}

	/* Do the parse. */
	b = dn_expand(handle->_msg, handle->_eom,
		      handle->_msg_ptr, rr->name, NS_MAXDNAME);
	if (b < 0)
		return (-1);
	handle->_msg_ptr += b;
	if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
		RETERR(EMSGSIZE);
	NS_GET16(rr->type, handle->_msg_ptr);
	NS_GET16(rr->rr_class, handle->_msg_ptr);
	if (section == ns_s_qd) {
		rr->ttl = 0;
		rr->rdlength = 0;
		rr->rdata = NULL;
	} else {
		if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
			RETERR(EMSGSIZE);
		NS_GET32(rr->ttl, handle->_msg_ptr);
		NS_GET16(rr->rdlength, handle->_msg_ptr);
		if (handle->_msg_ptr + rr->rdlength > handle->_eom)
			RETERR(EMSGSIZE);
		rr->rdata = handle->_msg_ptr;
		handle->_msg_ptr += rr->rdlength;
	}
	if (++handle->_rrnum > handle->_counts[(int)section])
		setsection(handle, (ns_sect)((int)section + 1));

	/* All done. */
	return (0);
}

/*
 * This is identical to the above but uses network-format (uncompressed) names.
 */
int
ns_parserr2(ns_msg *handle, ns_sect section, int rrnum, ns_rr2 *rr) {
	int b;
	int tmp;

	/* Make section right. */
	tmp = section;
	if (tmp < 0 || section >= ns_s_max)
		RETERR(ENODEV);
	if (section != handle->_sect)
		setsection(handle, section);

	/* Make rrnum right. */
	if (rrnum == -1)
		rrnum = handle->_rrnum;
	if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
		RETERR(ENODEV);
	if (rrnum < handle->_rrnum)
		setsection(handle, section);
	if (rrnum > handle->_rrnum) {
		b = ns_skiprr(handle->_msg_ptr, handle->_eom, section,
			      rrnum - handle->_rrnum);

		if (b < 0)
			return (-1);
		handle->_msg_ptr += b;
		handle->_rrnum = rrnum;
	}

	/* Do the parse. */
	b = ns_name_unpack2(handle->_msg, handle->_eom, handle->_msg_ptr,
			    rr->nname, NS_MAXNNAME, &rr->nnamel);
	if (b < 0)
		return (-1);
	handle->_msg_ptr += b;
	if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
		RETERR(EMSGSIZE);
	NS_GET16(rr->type, handle->_msg_ptr);
	NS_GET16(rr->rr_class, handle->_msg_ptr);
	if (section == ns_s_qd) {
		rr->ttl = 0;
		rr->rdlength = 0;
		rr->rdata = NULL;
	} else {
		if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
			RETERR(EMSGSIZE);
		NS_GET32(rr->ttl, handle->_msg_ptr);
		NS_GET16(rr->rdlength, handle->_msg_ptr);
		if (handle->_msg_ptr + rr->rdlength > handle->_eom)
			RETERR(EMSGSIZE);
		rr->rdata = handle->_msg_ptr;
		handle->_msg_ptr += rr->rdlength;
	}
	if (++handle->_rrnum > handle->_counts[(int)section])
		setsection(handle, (ns_sect)((int)section + 1));

	/* All done. */
	return (0);
}

/* Private. */

static void
setsection(ns_msg *msg, ns_sect sect) {
	msg->_sect = sect;
	if (sect == ns_s_max) {
		msg->_rrnum = -1;
		msg->_msg_ptr = NULL;
	} else {
		msg->_rrnum = 0;
		msg->_msg_ptr = msg->_sections[(int)sect];
	}
}

/*! \file */