mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-03 04:01:43 +08:00
cd5743fdec
* include/resolv.h: Remove hidden proto declarations for __ns_* functions. Add them for __dn_count_labels and __p_secstodate. * include/arpa/nameser.h: Add a number of hidden proto declarations. Define ns_msg_getflags macro here. * resolv/res_debug.c: Add hidden definition for __dn_count_labels and __p_secstodate. * resolv/Versions: Export functions from <arpa/nameser.h> from libresolv in version GLIBC_2.9. * resolv/ns_name.c: Integrate changes from bind 9.5.0. Add necessary hidden definitions. * resolv/ns_netint.c: Likewise. * resolv/ns_parse.c: Likewise. * resolv/ns_print.c: Likewise. * resolv/ns_samedomain.c: Likewise. * resolv/ns_ttl.c: Likewise. * resolv/arpa/nameser_compat.h: Likewise. * resolv/arpa/nameser.h: Likewise. Remove macros which redirect function calls. * resolv/nss_dns/dns-canon.c (_nss_dns_getcanonname_r): Use __ns_get16 instead of ns_get16. * resolv/nss_dns/dns-host.c (getanswer_r): Use __ns_get16 and __ns_get32 instead of ns_get16 and ns_get32 respectively. (gaih_getanswer_slice): Likewise. * resolv/Makefile (libresolv-routines): Add ns_date. * resolv/ns_date.c: New file.
208 lines
4.8 KiB
C
208 lines
4.8 KiB
C
/*
|
|
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
|
|
* Copyright (c) 1995,1999 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
|
|
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
|
|
* CONSORTIUM 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_samedomain.c,v 8.9 1999/10/15 21:06:51 vixie Exp $";
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
#include <arpa/nameser.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
|
|
/*%
|
|
* Check whether a name belongs to a domain.
|
|
*
|
|
* Inputs:
|
|
*\li a - the domain whose ancestory is being verified
|
|
*\li b - the potential ancestor we're checking against
|
|
*
|
|
* Return:
|
|
*\li boolean - is a at or below b?
|
|
*
|
|
* Notes:
|
|
*\li Trailing dots are first removed from name and domain.
|
|
* Always compare complete subdomains, not only whether the
|
|
* domain name is the trailing string of the given name.
|
|
*
|
|
*\li "host.foobar.top" lies in "foobar.top" and in "top" and in ""
|
|
* but NOT in "bar.top"
|
|
*/
|
|
|
|
int
|
|
ns_samedomain(const char *a, const char *b) {
|
|
size_t la, lb;
|
|
int diff, i, escaped;
|
|
const char *cp;
|
|
|
|
la = strlen(a);
|
|
lb = strlen(b);
|
|
|
|
/* Ignore a trailing label separator (i.e. an unescaped dot) in 'a'. */
|
|
if (la != 0U && a[la - 1] == '.') {
|
|
escaped = 0;
|
|
/* Note this loop doesn't get executed if la==1. */
|
|
for (i = la - 2; i >= 0; i--)
|
|
if (a[i] == '\\') {
|
|
if (escaped)
|
|
escaped = 0;
|
|
else
|
|
escaped = 1;
|
|
} else
|
|
break;
|
|
if (!escaped)
|
|
la--;
|
|
}
|
|
|
|
/* Ignore a trailing label separator (i.e. an unescaped dot) in 'b'. */
|
|
if (lb != 0U && b[lb - 1] == '.') {
|
|
escaped = 0;
|
|
/* note this loop doesn't get executed if lb==1 */
|
|
for (i = lb - 2; i >= 0; i--)
|
|
if (b[i] == '\\') {
|
|
if (escaped)
|
|
escaped = 0;
|
|
else
|
|
escaped = 1;
|
|
} else
|
|
break;
|
|
if (!escaped)
|
|
lb--;
|
|
}
|
|
|
|
/* lb == 0 means 'b' is the root domain, so 'a' must be in 'b'. */
|
|
if (lb == 0U)
|
|
return (1);
|
|
|
|
/* 'b' longer than 'a' means 'a' can't be in 'b'. */
|
|
if (lb > la)
|
|
return (0);
|
|
|
|
/* 'a' and 'b' being equal at this point indicates sameness. */
|
|
if (lb == la)
|
|
return (strncasecmp(a, b, lb) == 0);
|
|
|
|
/* Ok, we know la > lb. */
|
|
|
|
diff = la - lb;
|
|
|
|
/*
|
|
* If 'a' is only 1 character longer than 'b', then it can't be
|
|
* a subdomain of 'b' (because of the need for the '.' label
|
|
* separator).
|
|
*/
|
|
if (diff < 2)
|
|
return (0);
|
|
|
|
/*
|
|
* If the character before the last 'lb' characters of 'b'
|
|
* isn't '.', then it can't be a match (this lets us avoid
|
|
* having "foobar.com" match "bar.com").
|
|
*/
|
|
if (a[diff - 1] != '.')
|
|
return (0);
|
|
|
|
/*
|
|
* We're not sure about that '.', however. It could be escaped
|
|
* and thus not a really a label separator.
|
|
*/
|
|
escaped = 0;
|
|
for (i = diff - 2; i >= 0; i--)
|
|
if (a[i] == '\\') {
|
|
if (escaped)
|
|
escaped = 0;
|
|
else
|
|
escaped = 1;
|
|
} else
|
|
break;
|
|
if (escaped)
|
|
return (0);
|
|
|
|
/* Now compare aligned trailing substring. */
|
|
cp = a + diff;
|
|
return (strncasecmp(cp, b, lb) == 0);
|
|
}
|
|
libresolv_hidden_def (ns_samedomain)
|
|
|
|
/*%
|
|
* is "a" a subdomain of "b"?
|
|
*/
|
|
int
|
|
ns_subdomain(const char *a, const char *b) {
|
|
return (ns_samename(a, b) != 1 && ns_samedomain(a, b));
|
|
}
|
|
|
|
/*%
|
|
* make a canonical copy of domain name "src"
|
|
*
|
|
* notes:
|
|
* \code
|
|
* foo -> foo.
|
|
* foo. -> foo.
|
|
* foo.. -> foo.
|
|
* foo\. -> foo\..
|
|
* foo\\. -> foo\\.
|
|
* \endcode
|
|
*/
|
|
|
|
int
|
|
ns_makecanon(const char *src, char *dst, size_t dstsize) {
|
|
size_t n = strlen(src);
|
|
|
|
if (n + sizeof "." > dstsize) { /*%< Note: sizeof == 2 */
|
|
__set_errno (EMSGSIZE);
|
|
return (-1);
|
|
}
|
|
strcpy(dst, src);
|
|
while (n >= 1U && dst[n - 1] == '.') /*%< Ends in "." */
|
|
if (n >= 2U && dst[n - 2] == '\\' && /*%< Ends in "\." */
|
|
(n < 3U || dst[n - 3] != '\\')) /*%< But not "\\." */
|
|
break;
|
|
else
|
|
dst[--n] = '\0';
|
|
dst[n++] = '.';
|
|
dst[n] = '\0';
|
|
return (0);
|
|
}
|
|
libresolv_hidden_def (ns_makecanon)
|
|
|
|
/*%
|
|
* determine whether domain name "a" is the same as domain name "b"
|
|
*
|
|
* return:
|
|
*\li -1 on error
|
|
*\li 0 if names differ
|
|
*\li 1 if names are the same
|
|
*/
|
|
|
|
int
|
|
ns_samename(const char *a, const char *b) {
|
|
char ta[NS_MAXDNAME], tb[NS_MAXDNAME];
|
|
|
|
if (ns_makecanon(a, ta, sizeof ta) < 0 ||
|
|
ns_makecanon(b, tb, sizeof tb) < 0)
|
|
return (-1);
|
|
if (strcasecmp(ta, tb) == 0)
|
|
return (1);
|
|
else
|
|
return (0);
|
|
}
|
|
libresolv_hidden_def (ns_samename)
|
|
|
|
/*! \file */
|