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2003-10-26  Ulrich Drepper  <drepper@redhat.com>

	* resolv/nss_dns/dns-host.c (_nss_dns_gethostbyaddr_r): Default
	reverse lookup format for IPv6 addresses is using bitfields and
	.ip6.arpa suffix.
	* resolv/ns_name.c: Implement encoding and decoding bitfields in
	hex format.
This commit is contained in:
Ulrich Drepper 2003-10-26 08:34:38 +00:00
parent 4d54786a9b
commit 5ae19a5023
3 changed files with 109 additions and 13 deletions
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8
ChangeLog
View File

@ -1,3 +1,11 @@
2003-10-26 Ulrich Drepper <drepper@redhat.com>
* resolv/nss_dns/dns-host.c (_nss_dns_gethostbyaddr_r): Default
reverse lookup format for IPv6 addresses is using bitfields and
.ip6.arpa suffix.
* resolv/ns_name.c: Implement encoding and decoding bitfields in
hex format.
2003-10-23 Jakub Jelinek <jakub@redhat.com>
* locale/programs/locale.c (show_info): Fix printing word values on

99
resolv/ns_name.c
View File

@ -24,6 +24,7 @@ static const char rcsid[] = "$BINDId: ns_name.c,v 8.15 2000/03/30 22:53:46 vixie
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <ctype.h>
#include <errno.h>
#include <resolv.h>
#include <string.h>
@ -64,7 +65,7 @@ ns_name_ntop(const u_char *src, char *dst, size_t dstsiz) {
eom = dst + dstsiz;
while ((n = *cp++) != 0) {
if ((n & NS_CMPRSFLGS) != 0) {
if ((n & NS_CMPRSFLGS) != 0 && n != 0x41) {
/* Some kind of compression pointer. */
__set_errno (EMSGSIZE);
return (-1);
@ -76,6 +77,29 @@ ns_name_ntop(const u_char *src, char *dst, size_t dstsiz) {
}
*dn++ = '.';
}
if (n == 0x41) {
n = *cp++ / 8;
if (dn + n * 2 + 4 >= eom) {
__set_errno (EMSGSIZE);
return (-1);
}
*dn++ = '\\';
*dn++ = '[';
*dn++ = 'x';
while (n-- > 0) {
c = *cp++;
unsigned u = c >> 4;
*dn++ = u > 9 ? 'a' + u - 10 : '0' + u;
u = c & 0xf;
*dn++ = u > 9 ? 'a' + u - 10 : '0' + u;
}
*dn++ = ']';
continue;
}
if (dn + n >= eom) {
__set_errno (EMSGSIZE);
return (-1);
@ -165,6 +189,43 @@ ns_name_pton(const char *src, u_char *dst, size_t dstsiz) {
return (-1);
}
c = n;
} else if (c == '[' && label == bp - 1 && *src == 'x') {
/* Theoretically we would have to handle \[o
as well but we do not since we do not need
it internally. */
*label = 0x41;
label = bp++;
/* Another simplification: always assume
128 bit number. */
if (bp + 16 >= eom) {
__set_errno (EMSGSIZE);
return (-1);
}
++src;
while (isxdigit (*src)) {
n = *src > '9' ? *src - 'a' + 10 : *src - '0';
++src;
if (! isxdigit(*src)) {
__set_errno (EMSGSIZE);
return (-1);
}
n <<= 4;
n += *src > '9' ? *src - 'a' + 10 : *src - '0';
*bp++ = n;
++src;
}
*label = (bp - label - 1) * 8;
if (*src++ != ']' || *src++ != '.') {
__set_errno (EMSGSIZE);
return (-1);
}
escaped = 0;
label = bp++;
if (bp >= eom) {
__set_errno (EMSGSIZE);
return (-1);
}
continue;
}
escaped = 0;
} else if (c == '\\') {
@ -303,6 +364,20 @@ ns_name_unpack(const u_char *msg, const u_char *eom, const u_char *src,
while ((n = *srcp++) != 0) {
/* Check for indirection. */
switch (n & NS_CMPRSFLGS) {
case 0x40:
if (n == 0x41) {
if (dstp + 1 >= dstlim) {
__set_errno (EMSGSIZE);
return (-1);
}
*dstp++ = 0x41;
n = *srcp++ / 8;
++checked;
} else {
__set_errno (EMSGSIZE);
return (-1); /* flag error */
}
/* FALLTHROUGH */
case 0:
/* Limit checks. */
if (dstp + n + 1 >= dstlim || srcp + n >= eom) {
@ -310,9 +385,7 @@ ns_name_unpack(const u_char *msg, const u_char *eom, const u_char *src,
return (-1);
}
checked += n + 1;
*dstp++ = n;
memcpy(dstp, srcp, n);
dstp += n;
dstp = mempcpy(dstp, srcp - 1, n + 1);
srcp += n;
break;
@ -394,10 +467,12 @@ ns_name_pack(const u_char *src, u_char *dst, int dstsiz,
l = 0;
do {
n = *srcp;
if ((n & NS_CMPRSFLGS) != 0) {
if ((n & NS_CMPRSFLGS) != 0 && n != 0x41) {
__set_errno (EMSGSIZE);
return (-1);
}
if (n == 0x41)
n = *++srcp / 8;
l += n + 1;
if (l > MAXCDNAME) {
__set_errno (EMSGSIZE);
@ -411,7 +486,7 @@ ns_name_pack(const u_char *src, u_char *dst, int dstsiz,
do {
/* Look to see if we can use pointers. */
n = *srcp;
if (n != 0 && msg != NULL) {
if (n != 0 && n != 0x41 && msg != NULL) {
l = dn_find(srcp, msg, (const u_char * const *)dnptrs,
(const u_char * const *)lpp);
if (l >= 0) {
@ -431,9 +506,15 @@ ns_name_pack(const u_char *src, u_char *dst, int dstsiz,
}
}
/* copy label to buffer */
if (n & NS_CMPRSFLGS) { /* Should not happen. */
if ((n & NS_CMPRSFLGS) != 0 && n != 0x41) { /* Should not happen. */
goto cleanup;
}
if (n == 0x41) {
n = *++srcp / 8;
if (dstp + 1 >= eob)
goto cleanup;
*dstp++ = 0x41;
}
if (dstp + 1 + n >= eob) {
goto cleanup;
}
@ -448,7 +529,7 @@ cleanup:
*lpp = NULL;
__set_errno (EMSGSIZE);
return (-1);
}
}
return (dstp - dst);
}
@ -466,7 +547,7 @@ ns_name_uncompress(const u_char *msg, const u_char *eom, const u_char *src,
{
u_char tmp[NS_MAXCDNAME];
int n;
if ((n = ns_name_unpack(msg, eom, src, tmp, sizeof tmp)) == -1)
return (-1);
if (ns_name_ntop(tmp, dst, dstsiz) == -1)

15
resolv/nss_dns/dns-host.c
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1996-2000, 2001, 2002 Free Software Foundation, Inc.
/* Copyright (C) 1996-2000, 2001, 2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Extended from original form by Ulrich Drepper <drepper@cygnus.com>, 1996.
@ -305,10 +305,14 @@ _nss_dns_gethostbyaddr_r (const void *addr, socklen_t len, int af,
(uaddr[2] & 0xff), (uaddr[1] & 0xff), (uaddr[0] & 0xff));
break;
case AF_INET6:
/* XXX Maybe we need an option to select whether to use the nibble
or the bitfield form. The RFC requires the bitfield form so
we use it. */
qp = qbuf;
for (n = IN6ADDRSZ - 1; n >= 0; n--)
qp += sprintf (qp, "%x.%x.", uaddr[n] & 0xf, (uaddr[n] >> 4) & 0xf);
strcpy (qp, "ip6.arpa");
qp = stpcpy (qbuf, "\\[x");
for (n = 0; n < IN6ADDRSZ; ++n)
qp += sprintf (qp, "%02hhx", uaddr[n]);
strcpy (qp, "].ip6.arpa");
break;
default:
/* Cannot happen. */
@ -321,6 +325,9 @@ _nss_dns_gethostbyaddr_r (const void *addr, socklen_t len, int af,
1024, &host_buffer.ptr);
if (n < 0 && af == AF_INET6)
{
qp = qbuf;
for (n = IN6ADDRSZ - 1; n >= 0; n--)
qp += sprintf (qp, "%x.%x.", uaddr[n] & 0xf, (uaddr[n] >> 4) & 0xf);
strcpy (qp, "ip6.int");
n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, host_buffer.buf->buf,
host_buffer.buf != orig_host_buffer