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authorAndreas Schneider <asn@cynapses.org>2010-09-06 14:28:38 +0200
committerAndreas Schneider <asn@cynapses.org>2010-09-06 14:28:38 +0200
commitf7842e3a4b9acea2126ff725f993c299aef0e6db (patch)
tree18239f819a5edbcfc7f2961c48f3f9297314ef22 /src/match.c
parent38421403d2dc45636e597f2a909daa6ae31976de (diff)
downloadlibssh-f7842e3a4b9acea2126ff725f993c299aef0e6db.tar.gz
libssh-f7842e3a4b9acea2126ff725f993c299aef0e6db.tar.xz
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misc: Rename libssh/ to src/
Diffstat (limited to 'src/match.c')
-rw-r--r--src/match.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/src/match.c b/src/match.c
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+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ * Simple pattern matching, with '*' and '?' as wildcards.
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ */
+
+/*
+ * Copyright (c) 2000 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <ctype.h>
+#include <string.h>
+#include <sys/types.h>
+
+#include "libssh/priv.h"
+
+/*
+ * Returns true if the given string matches the pattern (which may contain ?
+ * and * as wildcards), and zero if it does not match.
+ */
+static int match_pattern(const char *s, const char *pattern) {
+ for (;;) {
+ /* If at end of pattern, accept if also at end of string. */
+ if (!*pattern) {
+ return !*s;
+ }
+
+ if (*pattern == '*') {
+ /* Skip the asterisk. */
+ pattern++;
+
+ /* If at end of pattern, accept immediately. */
+ if (!*pattern)
+ return 1;
+
+ /* If next character in pattern is known, optimize. */
+ if (*pattern != '?' && *pattern != '*') {
+ /*
+ * Look instances of the next character in
+ * pattern, and try to match starting from
+ * those.
+ */
+ for (; *s; s++)
+ if (*s == *pattern && match_pattern(s + 1, pattern + 1)) {
+ return 1;
+ }
+ /* Failed. */
+ return 0;
+ }
+ /*
+ * Move ahead one character at a time and try to
+ * match at each position.
+ */
+ for (; *s; s++) {
+ if (match_pattern(s, pattern)) {
+ return 1;
+ }
+ }
+ /* Failed. */
+ return 0;
+ }
+ /*
+ * There must be at least one more character in the string.
+ * If we are at the end, fail.
+ */
+ if (!*s) {
+ return 0;
+ }
+
+ /* Check if the next character of the string is acceptable. */
+ if (*pattern != '?' && *pattern != *s) {
+ return 0;
+ }
+
+ /* Move to the next character, both in string and in pattern. */
+ s++;
+ pattern++;
+ }
+
+ /* NOTREACHED */
+}
+
+/*
+ * Tries to match the string against the comma-separated sequence of subpatterns
+ * (each possibly preceded by ! to indicate negation).
+ * Returns -1 if negation matches, 1 if there is a positive match, 0 if there is
+ * no match at all.
+ */
+static int match_pattern_list(const char *string, const char *pattern,
+ unsigned int len, int dolower) {
+ char sub[1024];
+ int negated;
+ int got_positive;
+ unsigned int i, subi;
+
+ got_positive = 0;
+ for (i = 0; i < len;) {
+ /* Check if the subpattern is negated. */
+ if (pattern[i] == '!') {
+ negated = 1;
+ i++;
+ } else {
+ negated = 0;
+ }
+
+ /*
+ * Extract the subpattern up to a comma or end. Convert the
+ * subpattern to lowercase.
+ */
+ for (subi = 0;
+ i < len && subi < sizeof(sub) - 1 && pattern[i] != ',';
+ subi++, i++) {
+ sub[subi] = dolower && isupper(pattern[i]) ?
+ (char)tolower(pattern[i]) : pattern[i];
+ }
+
+ /* If subpattern too long, return failure (no match). */
+ if (subi >= sizeof(sub) - 1) {
+ return 0;
+ }
+
+ /* If the subpattern was terminated by a comma, skip the comma. */
+ if (i < len && pattern[i] == ',') {
+ i++;
+ }
+
+ /* Null-terminate the subpattern. */
+ sub[subi] = '\0';
+
+ /* Try to match the subpattern against the string. */
+ if (match_pattern(string, sub)) {
+ if (negated) {
+ return -1; /* Negative */
+ } else {
+ got_positive = 1; /* Positive */
+ }
+ }
+ }
+
+ /*
+ * Return success if got a positive match. If there was a negative
+ * match, we have already returned -1 and never get here.
+ */
+ return got_positive;
+}
+
+/*
+ * Tries to match the host name (which must be in all lowercase) against the
+ * comma-separated sequence of subpatterns (each possibly preceded by ! to
+ * indicate negation).
+ * Returns -1 if negation matches, 1 if there is a positive match, 0 if there
+ * is no match at all.
+ */
+int match_hostname(const char *host, const char *pattern, unsigned int len) {
+ return match_pattern_list(host, pattern, len, 1);
+}
+
+/* vim: set ts=2 sw=2 et cindent: */