Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 203 insertions, 0 deletions

diff --git a/REORG.TODO/resolv/ns_samedomain.c b/REORG.TODO/resolv/ns_samedomain.c
new file mode 100644
index 0000000000..5d1bf39fc7
--- /dev/null
+++ b/REORG.TODO/resolv/ns_samedomain.c
@@ -0,0 +1,203 @@
+/*
+ * 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.
+ */
+
+#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 ancestry 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 */