mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 13:00:06 +00:00
2fbe5860d3
This reflects what the remaining functions in the file do. The __res_dnok, __res_hnok, __res_mailok, __res_ownok were moved with the script, using --no-new-version, and turned into compat symbols. __libc_res_dnok@@GLIBC_PRIVATE and __libc_res_hnok@@GLIBC_PRIVATE are added for internal use, to avoid accidentally binding to compatibility symbols. The new public symbols res_dnok, res_hnok, res_mailok, res_ownok were added using make update-all-abi. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
221 lines
8.1 KiB
C
221 lines
8.1 KiB
C
/* Syntax checking for DNS domain names.
|
|
Copyright (C) 1995-2021 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
/*
|
|
* 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.
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* Portions 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 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.
|
|
*/
|
|
|
|
#include <arpa/nameser.h>
|
|
#include <resolv.h>
|
|
#include <shlib-compat.h>
|
|
|
|
/* Return true if the string consists of printable ASCII characters
|
|
only. */
|
|
static bool
|
|
printable_string (const char *dn)
|
|
{
|
|
while (true)
|
|
{
|
|
char ch = *dn;
|
|
if (ch == '\0')
|
|
return true;
|
|
if (ch <= ' ' || ch > '~')
|
|
return false;
|
|
++dn;
|
|
}
|
|
}
|
|
|
|
/* Return true if DN points to a name consisting only of [0-9a-zA-Z_-]
|
|
characters. DN must be in DNS wire format, without
|
|
compression. */
|
|
static bool
|
|
binary_hnok (const unsigned char *dn)
|
|
{
|
|
while (true)
|
|
{
|
|
size_t label_length = *dn;
|
|
if (label_length == 0)
|
|
break;
|
|
++dn;
|
|
const unsigned char *label_end = dn + label_length;
|
|
do
|
|
{
|
|
unsigned char ch = *dn;
|
|
if (!(('0' <= ch && ch <= '9')
|
|
|| ('A' <= ch && ch <= 'Z')
|
|
|| ('a' <= ch && ch <= 'z')
|
|
|| ch == '-' || ch == '_'))
|
|
return false;
|
|
++dn;
|
|
}
|
|
while (dn < label_end);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* Return true if the binary domain name has a first labels which
|
|
starts with '-'. */
|
|
static inline bool
|
|
binary_leading_dash (const unsigned char *dn)
|
|
{
|
|
return dn[0] > 0 && dn[1] == '-';
|
|
}
|
|
|
|
/* Return 1 if res_hnok is a valid host name. Labels must only
|
|
contain [0-9a-zA-Z_-] characters, and the name must not start with
|
|
a '-'. The latter is to avoid confusion with program options. */
|
|
int
|
|
___res_hnok (const char *dn)
|
|
{
|
|
unsigned char buf[NS_MAXCDNAME];
|
|
if (!printable_string (dn)
|
|
|| __ns_name_pton (dn, buf, sizeof (buf)) < 0
|
|
|| binary_leading_dash (buf))
|
|
return 0;
|
|
return binary_hnok (buf);
|
|
}
|
|
versioned_symbol (libc, ___res_hnok, res_hnok, GLIBC_2_34);
|
|
versioned_symbol (libc, ___res_hnok, __libc_res_hnok, GLIBC_PRIVATE);
|
|
libc_hidden_ver (___res_hnok, __libc_res_hnok)
|
|
#if OTHER_SHLIB_COMPAT (libresolv, GLIBC_2_0, GLIBC_2_34)
|
|
compat_symbol (libresolv, ___res_hnok, __res_hnok, GLIBC_2_0);
|
|
#endif
|
|
|
|
/* Hostname-like (A, MX, WKS) owners can have "*" as their first label
|
|
but must otherwise be as a host name. */
|
|
int
|
|
___res_ownok (const char *dn)
|
|
{
|
|
unsigned char buf[NS_MAXCDNAME];
|
|
if (!printable_string (dn)
|
|
|| __ns_name_pton (dn, buf, sizeof (buf)) < 0
|
|
|| binary_leading_dash (buf))
|
|
return 0;
|
|
if (buf[0] == 1 && buf [1] == '*')
|
|
/* Skip over the leading "*." part. */
|
|
return binary_hnok (buf + 2);
|
|
else
|
|
return binary_hnok (buf);
|
|
}
|
|
versioned_symbol (libc, ___res_ownok, res_ownok, GLIBC_2_34);
|
|
#if OTHER_SHLIB_COMPAT (libresolv, GLIBC_2_0, GLIBC_2_34)
|
|
compat_symbol (libresolv, ___res_ownok, __res_ownok, GLIBC_2_0);
|
|
#endif
|
|
|
|
/* SOA RNAMEs and RP RNAMEs can have any byte in their first label,
|
|
but the rest of the name has to look like a host name. */
|
|
int
|
|
___res_mailok (const char *dn)
|
|
{
|
|
unsigned char buf[NS_MAXCDNAME];
|
|
if (!printable_string (dn)
|
|
|| __ns_name_pton (dn, buf, sizeof (buf)) < 0)
|
|
return 0;
|
|
unsigned char label_length = buf[0];
|
|
/* "." is a valid missing representation */
|
|
if (label_length == 0)
|
|
return 1;
|
|
/* Skip over the first label. */
|
|
unsigned char *tail = buf + 1 + label_length;
|
|
if (*tail == 0)
|
|
/* More than one label is required (except for "."). */
|
|
return 0;
|
|
return binary_hnok (tail);
|
|
}
|
|
versioned_symbol (libc, ___res_mailok, res_mailok, GLIBC_2_34);
|
|
#if OTHER_SHLIB_COMPAT (libresolv, GLIBC_2_0, GLIBC_2_34)
|
|
compat_symbol (libresolv, ___res_mailok, __res_mailok, GLIBC_2_0);
|
|
#endif
|
|
|
|
/* Return 1 if DN is a syntactically valid domain name. Empty names
|
|
are accepted. */
|
|
int
|
|
___res_dnok (const char *dn)
|
|
{
|
|
unsigned char buf[NS_MAXCDNAME];
|
|
return printable_string (dn) && __ns_name_pton (dn, buf, sizeof (buf)) >= 0;
|
|
}
|
|
versioned_symbol (libc, ___res_dnok, res_dnok, GLIBC_2_34);
|
|
versioned_symbol (libc, ___res_dnok, __libc_res_dnok, GLIBC_PRIVATE);
|
|
libc_hidden_ver (___res_dnok, __libc_res_dnok)
|
|
#if OTHER_SHLIB_COMPAT (libresolv, GLIBC_2_0, GLIBC_2_34)
|
|
compat_symbol (libresolv, ___res_dnok, __res_dnok, GLIBC_2_0);
|
|
#endif
|