diff options
Diffstat (limited to 'lib/bind/nameser/ns_samedomain.c')
| -rw-r--r-- | lib/bind/nameser/ns_samedomain.c | 207 |
1 files changed, 0 insertions, 207 deletions
diff --git a/lib/bind/nameser/ns_samedomain.c b/lib/bind/nameser/ns_samedomain.c deleted file mode 100644 index a720f6a..0000000 --- a/lib/bind/nameser/ns_samedomain.c +++ /dev/null @@ -1,207 +0,0 @@ -/* - * 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 ISC DISCLAIMS ALL WARRANTIES - * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC 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 1.5.18.1 2005/04/27 05:01:09 sra Exp $"; -#endif - -#include "port_before.h" - -#include <sys/types.h> -#include <arpa/nameser.h> -#include <errno.h> -#include <string.h> - -#include "port_after.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); -} - -/*% - * 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 */ - 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); -} - -/*% - * 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); -} - -/*! \file */ |
