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glibc/resolv/ns_parse.c
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/* | |
* 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. | |
*/ | |
#if !defined(_LIBC) && !defined(lint) | |
static const char rcsid[] = "$BINDId: ns_parse.c,v 8.13 1999/10/13 16:39:35 vixie Exp $"; | |
#endif | |
/* Import. */ | |
#include <sys/types.h> | |
#include <netinet/in.h> | |
#include <arpa/nameser.h> | |
#include <errno.h> | |
#include <resolv.h> | |
#include <string.h> | |
/* Forward. */ | |
static void setsection(ns_msg *msg, ns_sect sect); | |
/* Macros. */ | |
#define RETERR(err) do { __set_errno (err); return (-1); } while (0) | |
/* Public. */ | |
/* These need to be in the same order as the nres.h:ns_flag enum. */ | |
const 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). */ | |
}; | |
#undef ns_msg_getflag | |
int ns_msg_getflag(ns_msg handle, int flag) { | |
return(((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 ((void)NULL; 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); | |
return (ptr - optr); | |
} | |
libresolv_hidden_def (ns_skiprr) | |
int | |
ns_initparse(const u_char *msg, int msglen, ns_msg *handle) { | |
const u_char *eom = msg + msglen; | |
int i; | |
memset(handle, 0x5e, sizeof *handle); | |
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); | |
} | |
libresolv_hidden_def (ns_initparse) | |
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); | |
} | |
libresolv_hidden_def (ns_parserr) | |
/* 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 */ |