The Tor Browser: comparison other-licenses/android/ns

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+:a7b52db3df74
+/*	$NetBSD: ns_samedomain.c,v 1.2 2004/05/20 20:35:05 christos Exp $	*/
+/*
+* 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.
+*/
+/*
+* This version of this file is derived from Android 2.3 "Gingerbread",
+* which contains uncredited changes by Android/Google developers.  It has
+* been modified in 2011 for use in the Android build of Mozilla Firefox by
+* Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>,
+* and Steve Workman <sjhworkman@gmail.com>).
+* These changes are offered under the same license as the original NetBSD
+* file, whose copyright and license are unchanged above.
+*/
+#define ANDROID_CHANGES 1
+#define MOZILLA_NECKO_EXCLUDE_CODE 1
+#include <sys/cdefs.h>
+#ifndef lint
+#ifdef notdef
+static const char rcsid[] = "Id: ns_samedomain.c,v 1.1.2.2.4.2 2004/03/16 12:34:17 marka Exp";
+#else
+__RCSID("$NetBSD: ns_samedomain.c,v 1.2 2004/05/20 20:35:05 christos Exp $");
+#endif
+#endif
+#include <sys/types.h>
+#include "arpa_nameser.h"
+#include <errno.h>
+#include <string.h>
+#ifndef MOZILLA_NECKO_EXCLUDE_CODE
+#ifndef _LIBC
+/*
+* 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) {
+	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);
+}
+/*
+* int
+* ns_subdomain(a, b)
+*	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
+#endif
+/*
+* 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
+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);
+}
+/*
+* 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) {
+	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);
+}

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comparison: other-licenses/android/ns_samedomain.c

other-licenses/android/ns_samedomain.c