[rtems-libbsd commit] nameser/ns_samedomain.c: New file
Joel Sherrill
joel at rtems.org
Wed Sep 12 00:09:49 UTC 2012
Module: rtems-libbsd
Branch: master
Commit: 0d928a036e7b5465ab12dfbab1c9155d230a9fd5
Changeset: http://git.rtems.org/rtems-libbsd/commit/?id=0d928a036e7b5465ab12dfbab1c9155d230a9fd5
Author: Joel Sherrill <joel.sherrill at oarcorp.com>
Date: Tue Sep 11 19:13:52 2012 -0500
nameser/ns_samedomain.c: New file
---
freebsd-userspace/Makefile | 1 +
freebsd-userspace/from-freebsd.sh | 1 +
freebsd-userspace/lib/libc/nameser/ns_samedomain.c | 211 ++++++++++++++++++++
3 files changed, 213 insertions(+), 0 deletions(-)
diff --git a/freebsd-userspace/Makefile b/freebsd-userspace/Makefile
index 0633df7..f5a2518 100644
--- a/freebsd-userspace/Makefile
+++ b/freebsd-userspace/Makefile
@@ -60,6 +60,7 @@ C_FILES += lib/libc/nameser/ns_name.c
C_FILES += lib/libc/nameser/ns_netint.c
C_FILES += lib/libc/nameser/ns_parse.c
C_FILES += lib/libc/nameser/ns_print.c
+C_FILES += lib/libc/nameser/ns_samedomain.c
C_FILES += lib/libc/nameser/ns_ttl.c
C_FILES += lib/libc/net/if_indextoname.c
C_FILES += lib/libc/net/if_nameindex.c
diff --git a/freebsd-userspace/from-freebsd.sh b/freebsd-userspace/from-freebsd.sh
index 93b7199..00799fa 100755
--- a/freebsd-userspace/from-freebsd.sh
+++ b/freebsd-userspace/from-freebsd.sh
@@ -150,6 +150,7 @@ lib/libc/inet/inet_ntoa.c
lib/libc/inet/inet_ntop.c
lib/libc/inet/inet_pton.c
lib/libc/inet/nsap_addr.c
+lib/libc/nameser/ns_samedomain.c
lib/libc/net/netdb_private.h
lib/libc/net/res_config.h
EOF
diff --git a/freebsd-userspace/lib/libc/nameser/ns_samedomain.c b/freebsd-userspace/lib/libc/nameser/ns_samedomain.c
new file mode 100644
index 0000000..9c43c79
--- /dev/null
+++ b/freebsd-userspace/lib/libc/nameser/ns_samedomain.c
@@ -0,0 +1,211 @@
+/*
+ * 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 $";
+#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#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);
+}
+
+#ifndef _LIBC
+/*%
+ * 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));
+}
+#endif
+
+/*%
+ * 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 */
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