2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
283 lines
7.2 KiB
C
283 lines
7.2 KiB
C
/* $NetBSD: ns_parse.c,v 1.8 2009/04/12 19:43:37 christos Exp $ */
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/*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1996,1999 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#ifdef notdef
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static const char rcsid[] = "Id: ns_parse.c,v 1.10 2009/01/23 19:59:16 each Exp";
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#else
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__RCSID("$NetBSD: ns_parse.c,v 1.8 2009/04/12 19:43:37 christos Exp $");
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#endif
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#endif
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/* Import. */
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#include "port_before.h"
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <errno.h>
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#include <resolv.h>
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#include <string.h>
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#include "port_after.h"
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/* Forward. */
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static void setsection(ns_msg *msg, ns_sect sect);
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/* Macros. */
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#if !defined(SOLARIS2) || defined(__COVERITY__)
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#define RETERR(err) do { errno = (err); return (-1); } while (/*NOTREACHED*//*CONSTCOND*/0)
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#else
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#define RETERR(err) \
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do { errno = (err); if (errno == errno) return (-1); } while (0)
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#endif
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#define PARSE_FMT_PRESO 0 /* Parse using presentation-format names */
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#define PARSE_FMT_WIRE 1 /* Parse using network-format names */
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/* Public. */
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/* These need to be in the same order as the nres.h:ns_flag enum. */
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struct _ns_flagdata _ns_flagdata[16] = {
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{ 0x8000, 15 }, /*%< qr. */
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{ 0x7800, 11 }, /*%< opcode. */
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{ 0x0400, 10 }, /*%< aa. */
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{ 0x0200, 9 }, /*%< tc. */
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{ 0x0100, 8 }, /*%< rd. */
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{ 0x0080, 7 }, /*%< ra. */
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{ 0x0040, 6 }, /*%< z. */
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{ 0x0020, 5 }, /*%< ad. */
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{ 0x0010, 4 }, /*%< cd. */
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{ 0x000f, 0 }, /*%< rcode. */
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{ 0x0000, 0 }, /*%< expansion (1/6). */
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{ 0x0000, 0 }, /*%< expansion (2/6). */
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{ 0x0000, 0 }, /*%< expansion (3/6). */
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{ 0x0000, 0 }, /*%< expansion (4/6). */
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{ 0x0000, 0 }, /*%< expansion (5/6). */
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{ 0x0000, 0 }, /*%< expansion (6/6). */
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};
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int ns_msg_getflag(ns_msg handle, int flag) {
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return((u_int32_t)((handle)._flags & _ns_flagdata[flag].mask) >> _ns_flagdata[flag].shift);
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}
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int
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ns_skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count) {
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const u_char *optr = ptr;
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for (; count > 0; count--) {
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int b, rdlength;
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b = dn_skipname(ptr, eom);
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if (b < 0)
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RETERR(EMSGSIZE);
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ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/;
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if (section != ns_s_qd) {
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if (ptr + NS_INT32SZ + NS_INT16SZ > eom)
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RETERR(EMSGSIZE);
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ptr += NS_INT32SZ/*TTL*/;
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NS_GET16(rdlength, ptr);
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ptr += rdlength/*RData*/;
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}
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}
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if (ptr > eom)
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RETERR(EMSGSIZE);
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return (ptr - optr);
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}
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int
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ns_initparse(const u_char *msg, int msglen, ns_msg *handle) {
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const u_char *eom = msg + msglen;
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int i;
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handle->_msg = msg;
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handle->_eom = eom;
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if (msg + NS_INT16SZ > eom)
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RETERR(EMSGSIZE);
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NS_GET16(handle->_id, msg);
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if (msg + NS_INT16SZ > eom)
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RETERR(EMSGSIZE);
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NS_GET16(handle->_flags, msg);
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for (i = 0; i < ns_s_max; i++) {
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if (msg + NS_INT16SZ > eom)
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RETERR(EMSGSIZE);
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NS_GET16(handle->_counts[i], msg);
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}
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for (i = 0; i < ns_s_max; i++)
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if (handle->_counts[i] == 0)
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handle->_sections[i] = NULL;
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else {
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int b = ns_skiprr(msg, eom, (ns_sect)i,
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handle->_counts[i]);
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if (b < 0)
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return (-1);
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handle->_sections[i] = msg;
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msg += b;
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}
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if (msg != eom)
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RETERR(EMSGSIZE);
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setsection(handle, ns_s_max);
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return (0);
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}
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int
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ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) {
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int b;
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int tmp;
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/* Make section right. */
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tmp = section;
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if (tmp < 0 || section >= ns_s_max)
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RETERR(ENODEV);
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if (section != handle->_sect)
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setsection(handle, section);
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/* Make rrnum right. */
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if (rrnum == -1)
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rrnum = handle->_rrnum;
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if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
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RETERR(ENODEV);
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if (rrnum < handle->_rrnum)
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setsection(handle, section);
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if (rrnum > handle->_rrnum) {
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b = ns_skiprr(handle->_msg_ptr, handle->_eom, section,
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rrnum - handle->_rrnum);
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if (b < 0)
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return (-1);
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handle->_msg_ptr += b;
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handle->_rrnum = rrnum;
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}
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/* Do the parse. */
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b = dn_expand(handle->_msg, handle->_eom,
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handle->_msg_ptr, rr->name, NS_MAXDNAME);
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if (b < 0)
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return (-1);
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handle->_msg_ptr += b;
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if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
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RETERR(EMSGSIZE);
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NS_GET16(rr->type, handle->_msg_ptr);
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NS_GET16(rr->rr_class, handle->_msg_ptr);
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if (section == ns_s_qd) {
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rr->ttl = 0;
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rr->rdlength = 0;
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rr->rdata = NULL;
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} else {
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if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
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RETERR(EMSGSIZE);
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NS_GET32(rr->ttl, handle->_msg_ptr);
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NS_GET16(rr->rdlength, handle->_msg_ptr);
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if (handle->_msg_ptr + rr->rdlength > handle->_eom)
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RETERR(EMSGSIZE);
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rr->rdata = handle->_msg_ptr;
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handle->_msg_ptr += rr->rdlength;
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}
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if (++handle->_rrnum > handle->_counts[(int)section])
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setsection(handle, (ns_sect)((int)section + 1));
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/* All done. */
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return (0);
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}
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/*
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* This is identical to the above but uses network-format (uncompressed) names.
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*/
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int
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ns_parserr2(ns_msg *handle, ns_sect section, int rrnum, ns_rr2 *rr) {
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int b;
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int tmp;
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/* Make section right. */
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tmp = section;
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if (tmp < 0 || section >= ns_s_max)
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RETERR(ENODEV);
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if (section != handle->_sect)
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setsection(handle, section);
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/* Make rrnum right. */
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if (rrnum == -1)
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rrnum = handle->_rrnum;
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if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
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RETERR(ENODEV);
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if (rrnum < handle->_rrnum)
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setsection(handle, section);
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if (rrnum > handle->_rrnum) {
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b = ns_skiprr(handle->_msg_ptr, handle->_eom, section,
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rrnum - handle->_rrnum);
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if (b < 0)
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return (-1);
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handle->_msg_ptr += b;
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handle->_rrnum = rrnum;
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}
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/* Do the parse. */
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b = ns_name_unpack2(handle->_msg, handle->_eom, handle->_msg_ptr,
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rr->nname, NS_MAXNNAME, &rr->nnamel);
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if (b < 0)
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return (-1);
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handle->_msg_ptr += b;
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if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
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RETERR(EMSGSIZE);
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NS_GET16(rr->type, handle->_msg_ptr);
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NS_GET16(rr->rr_class, handle->_msg_ptr);
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if (section == ns_s_qd) {
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rr->ttl = 0;
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rr->rdlength = 0;
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rr->rdata = NULL;
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} else {
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if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
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RETERR(EMSGSIZE);
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NS_GET32(rr->ttl, handle->_msg_ptr);
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NS_GET16(rr->rdlength, handle->_msg_ptr);
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if (handle->_msg_ptr + rr->rdlength > handle->_eom)
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RETERR(EMSGSIZE);
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rr->rdata = handle->_msg_ptr;
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handle->_msg_ptr += rr->rdlength;
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}
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if (++handle->_rrnum > handle->_counts[(int)section])
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setsection(handle, (ns_sect)((int)section + 1));
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/* All done. */
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return (0);
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}
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/* Private. */
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static void
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setsection(ns_msg *msg, ns_sect sect) {
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msg->_sect = sect;
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if (sect == ns_s_max) {
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msg->_rrnum = -1;
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msg->_msg_ptr = NULL;
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} else {
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msg->_rrnum = 0;
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msg->_msg_ptr = msg->_sections[(int)sect];
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}
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}
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/*! \file */
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