#ifndef lint
static const char rcsid[] = "$Id: ns_parse.c,v 1.5.18.4 2007/08/27 03:34:24 marka Exp $";
#endif
#include "port_before.h"
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <errno.h>
#include <resolv.h>
#include <string.h>
#include "port_after.h"
static void setsection(ns_msg *msg, ns_sect sect);
#if !defined(SOLARIS2) || defined(__COVERITY__)
#define RETERR(err) do { errno = (err); return (-1); } while (0)
#else
#define RETERR(err) \
do { errno = (err); if (errno == errno) return (-1); } while (0)
#endif
struct _ns_flagdata _ns_flagdata[16] = {
{ 0x8000, 15 },
{ 0x7800, 11 },
{ 0x0400, 10 },
{ 0x0200, 9 },
{ 0x0100, 8 },
{ 0x0080, 7 },
{ 0x0040, 6 },
{ 0x0020, 5 },
{ 0x0010, 4 },
{ 0x000f, 0 },
{ 0x0000, 0 },
{ 0x0000, 0 },
{ 0x0000, 0 },
{ 0x0000, 0 },
{ 0x0000, 0 },
{ 0x0000, 0 },
};
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 + NS_INT16SZ + NS_INT16SZ;
if (section != ns_s_qd) {
if (ptr + NS_INT32SZ + NS_INT16SZ > eom)
RETERR(EMSGSIZE);
ptr += NS_INT32SZ;
NS_GET16(rdlength, ptr);
ptr += rdlength;
}
}
if (ptr > eom)
RETERR(EMSGSIZE);
return (ptr - optr);
}
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);
}
int
ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) {
int b;
int tmp;
tmp = section;
if (tmp < 0 || section >= ns_s_max)
RETERR(ENODEV);
if (section != handle->_sect)
setsection(handle, section);
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;
}
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));
return (0);
}
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];
}
}