ns_samedomain.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* 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.
*/
#ifndef lint
static const char rcsid[] = "$Id: ns_samedomain.c,v 8.11 2003/04/14 14:52:48 vixie Exp $";
#endif
#include "port_before.h"
#include <errno.h>
#include <string.h>
#include "port_after.h"
/*
* int
* ns_samedomain(a, b)
* Check whether a name belongs to a domain.
* Inputs:
* a - the domain whose ancestory is being verified
* b - the potential ancestor we're checking against
* Return:
* boolean - is a at or below b?
* Notes:
* 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.
*
* "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) {
const char *cp;
/* Ignore a trailing label separator (i.e. an unescaped dot) in 'a'. */
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'. */
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 == 0)
return (1);
/* 'b' longer than 'a' means 'a' can't be in 'b'. */
return (0);
/* 'a' and 'b' being equal at this point indicates sameness. */
return (strncasecmp(a, b, lb) == 0);
/* Ok, we know 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
*/
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. */
}
/*
* int
* ns_subdomain(a, b)
* is "a" a subdomain of "b"?
*/
int
ns_subdomain(const char *a, const char *b) {
}
/*
* int
* ns_makecanon(src, dst, dstsize)
* make a canonical copy of domain name "src"
* notes:
* foo -> foo.
* foo. -> foo.
* foo.. -> foo.
* foo\. -> foo\..
* foo\\. -> foo\\.
*/
int
return (-1);
}
break;
else
dst[--n] = '\0';
dst[n++] = '.';
dst[n] = '\0';
return (0);
}
/*
* int
* ns_samename(a, b)
* determine whether domain name "a" is the same as domain name "b"
* return:
* -1 on error
* 0 if names differ
* 1 if names are the same
*/
int
ns_samename(const char *a, const char *b) {
return (-1);
return (1);
else
return (0);
}