glibc/resolv/res_comp.c

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1995-02-18 02:27:10 +01:00
/*
* ++Copyright++ 1985, 1993
* -
* Copyright (c) 1985, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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 DAMAGE.
* -
* Portions Copyright (c) 1993 by Digital Equipment Corporation.
*
* 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, and that
* the name of Digital Equipment Corporation not be used in advertising or
* publicity pertaining to distribution of the document or software without
* specific, written prior permission.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
* CORPORATION 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.
* -
* --Copyright--
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93";
static char rcsid[] = "$Id$";
#endif /* LIBC_SCCS and not lint */
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <stdio.h>
#include <resolv.h>
#include <ctype.h>
#if defined(BSD) && (BSD >= 199103)
# include <unistd.h>
# include <string.h>
#else
# include "../conf/portability.h"
#endif
static int dn_find __P((u_char *exp_dn, u_char *msg,
u_char **dnptrs, u_char **lastdnptr));
/*
* Expand compressed domain name 'comp_dn' to full domain name.
* 'msg' is a pointer to the begining of the message,
* 'eomorig' points to the first location after the message,
* 'exp_dn' is a pointer to a buffer of size 'length' for the result.
* Return size of compressed name or -1 if there was an error.
*/
int
dn_expand(msg, eomorig, comp_dn, exp_dn, length)
const u_char *msg, *eomorig, *comp_dn;
char *exp_dn;
int length;
{
register const u_char *cp;
register char *dn;
register int n, c;
char *eom;
int len = -1, checked = 0;
dn = exp_dn;
cp = comp_dn;
eom = exp_dn + length;
/*
* fetch next label in domain name
*/
while (n = *cp++) {
/*
* Check for indirection
*/
switch (n & INDIR_MASK) {
case 0:
if (dn != exp_dn) {
if (dn >= eom)
return (-1);
*dn++ = '.';
}
if (dn+n >= eom)
return (-1);
checked += n + 1;
while (--n >= 0) {
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if (((c = *cp++) == '.') || (c == '\\')) {
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if (dn + n + 2 >= eom)
return (-1);
*dn++ = '\\';
}
*dn++ = c;
if (cp >= eomorig) /* out of range */
return (-1);
}
break;
case INDIR_MASK:
if (len < 0)
len = cp - comp_dn + 1;
cp = msg + (((n & 0x3f) << 8) | (*cp & 0xff));
if (cp < msg || cp >= eomorig) /* out of range */
return (-1);
checked += 2;
/*
* Check for loops in the compressed name;
* if we've looked at the whole message,
* there must be a loop.
*/
if (checked >= eomorig - msg)
return (-1);
break;
default:
return (-1); /* flag error */
}
}
*dn = '\0';
for (dn = exp_dn; (c = *dn) != '\0'; dn++)
if (isascii(c) && isspace(c))
return (-1);
if (len < 0)
len = cp - comp_dn;
return (len);
}
/*
* Compress domain name 'exp_dn' into 'comp_dn'.
* Return the size of the compressed name or -1.
* 'length' is the size of the array pointed to by 'comp_dn'.
* 'dnptrs' is a list of pointers to previous compressed names. dnptrs[0]
* is a pointer to the beginning of the message. The list ends with NULL.
* 'lastdnptr' is a pointer to the end of the arrary pointed to
* by 'dnptrs'. Side effect is to update the list of pointers for
* labels inserted into the message as we compress the name.
* If 'dnptr' is NULL, we don't try to compress names. If 'lastdnptr'
* is NULL, we don't update the list.
*/
int
dn_comp(exp_dn, comp_dn, length, dnptrs, lastdnptr)
const char *exp_dn;
u_char *comp_dn, **dnptrs, **lastdnptr;
int length;
{
register u_char *cp, *dn;
register int c, l;
u_char **cpp, **lpp, *sp, *eob;
u_char *msg;
dn = (u_char *)exp_dn;
cp = comp_dn;
eob = cp + length;
lpp = cpp = NULL;
if (dnptrs != NULL) {
if ((msg = *dnptrs++) != NULL) {
for (cpp = dnptrs; *cpp != NULL; cpp++)
;
lpp = cpp; /* end of list to search */
}
} else
msg = NULL;
for (c = *dn++; c != '\0'; ) {
/* look to see if we can use pointers */
if (msg != NULL) {
if ((l = dn_find(dn-1, msg, dnptrs, lpp)) >= 0) {
if (cp+1 >= eob)
return (-1);
*cp++ = (l >> 8) | INDIR_MASK;
*cp++ = l % 256;
return (cp - comp_dn);
}
/* not found, save it */
if (lastdnptr != NULL && cpp < lastdnptr-1) {
*cpp++ = cp;
*cpp = NULL;
}
}
sp = cp++; /* save ptr to length byte */
do {
if (c == '.') {
c = *dn++;
break;
}
if (c == '\\') {
if ((c = *dn++) == '\0')
break;
}
if (cp >= eob) {
if (msg != NULL)
*lpp = NULL;
return (-1);
}
*cp++ = c;
} while ((c = *dn++) != '\0');
/* catch trailing '.'s but not '..' */
if ((l = cp - sp - 1) == 0 && c == '\0') {
cp--;
break;
}
if (l <= 0 || l > MAXLABEL) {
if (msg != NULL)
*lpp = NULL;
return (-1);
}
*sp = l;
}
if (cp >= eob) {
if (msg != NULL)
*lpp = NULL;
return (-1);
}
*cp++ = '\0';
return (cp - comp_dn);
}
/*
* Skip over a compressed domain name. Return the size or -1.
*/
int
__dn_skipname(comp_dn, eom)
const u_char *comp_dn, *eom;
{
register const u_char *cp;
register int n;
cp = comp_dn;
while (cp < eom && (n = *cp++)) {
/*
* check for indirection
*/
switch (n & INDIR_MASK) {
case 0: /* normal case, n == len */
cp += n;
continue;
case INDIR_MASK: /* indirection */
cp++;
break;
default: /* illegal type */
return (-1);
}
break;
}
if (cp > eom)
return (-1);
return (cp - comp_dn);
}
static int
mklower(ch)
register int ch;
{
if (isascii(ch) && isupper(ch))
return (tolower(ch));
return (ch);
}
/*
* Search for expanded name from a list of previously compressed names.
* Return the offset from msg if found or -1.
* dnptrs is the pointer to the first name on the list,
* not the pointer to the start of the message.
*/
static int
dn_find(exp_dn, msg, dnptrs, lastdnptr)
u_char *exp_dn, *msg;
u_char **dnptrs, **lastdnptr;
{
register u_char *dn, *cp, **cpp;
register int n;
u_char *sp;
for (cpp = dnptrs; cpp < lastdnptr; cpp++) {
dn = exp_dn;
sp = cp = *cpp;
while (n = *cp++) {
/*
* check for indirection
*/
switch (n & INDIR_MASK) {
case 0: /* normal case, n == len */
while (--n >= 0) {
if (*dn == '.')
goto next;
if (*dn == '\\')
dn++;
if (mklower(*dn++) != mklower(*cp++))
goto next;
}
if ((n = *dn++) == '\0' && *cp == '\0')
return (sp - msg);
if (n == '.')
continue;
goto next;
case INDIR_MASK: /* indirection */
cp = msg + (((n & 0x3f) << 8) | *cp);
break;
default: /* illegal type */
return (-1);
}
}
if (*dn == '\0')
return (sp - msg);
next: ;
}
return (-1);
}
/*
* Routines to insert/extract short/long's.
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*/
u_int16_t
_getshort(msgp)
register const u_char *msgp;
{
register u_int16_t u;
GETSHORT(u, msgp);
return (u);
}
#ifdef NeXT
/*
* nExt machines have some funky library conventions, which we must maintain.
*/
u_int16_t
res_getshort(msgp)
register const u_char *msgp;
{
return (_getshort(msgp));
}
#endif
u_int32_t
_getlong(msgp)
register const u_char *msgp;
{
register u_int32_t u;
GETLONG(u, msgp);
return (u);
}
void
#if defined(__STDC__) || defined(__cplusplus)
__putshort(register u_int16_t s, register u_char *msgp) /* must match proto */
#else
__putshort(s, msgp)
register u_int16_t s;
register u_char *msgp;
#endif
{
PUTSHORT(s, msgp);
}
void
__putlong(l, msgp)
register u_int32_t l;
register u_char *msgp;
{
PUTLONG(l, msgp);
}
#ifdef ultrix
/* ultrix 4.0 had some icky packaging in its libc.a. alias for it here.
* there is more gunk of this kind over in res_debug.c.
*/
#undef putshort
void
#if defined(__STDC__) || defined(__cplusplus)
putshort(register u_short s, register u_char *msgp)
#else
putshort(s, msgp)
register u_short s;
register u_char *msgp;
#endif
{
__putshort(s, msgp);
}
#undef putlong
void
putlong(l, msgp)
register u_int32_t l;
register u_char *msgp;
{
__putlong(l, msgp);
}
#undef dn_skipname
dn_skipname(comp_dn, eom)
const u_char *comp_dn, *eom;
{
return (__dn_skipname(comp_dn, eom));
}
#endif /* Ultrix 4.0 hackery */