MFC r270096:

Bring in the new automounter, similar to what's provided in most other
UNIX systems, eg. MacOS X and Solaris.  It uses Sun-compatible map format,
has proper kernel support, and LDAP integration.

There are still a few outstanding problems; they will be fixed shortly.

Reviewed by:	allanjude@, emaste@, kib@, wblock@ (earlier versions)
Phabric:	D523
Relnotes:	yes
Sponsored by:	The FreeBSD Foundation

1 files changed, 270 insertions, 0 deletions

diff --git a/usr.sbin/autofs/defined.c b/usr.sbin/autofs/defined.c
new file mode 100644
index 0000000..7f1fb4b
--- /dev/null
+++ b/usr.sbin/autofs/defined.c
@@ -0,0 +1,270 @@
+/*-
+ * Copyright (c) 2014 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Edward Tomasz Napierala under sponsorship
+ * from the FreeBSD Foundation.
+ *
+ * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * All the "defined" stuff is for handling variables,
+ * such as ${OSNAME}, in maps.
+ */
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/ioctl.h>
+#include <sys/param.h>
+#include <sys/linker.h>
+#include <sys/mount.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <sys/utsname.h>
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <netdb.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <libutil.h>
+
+#include "common.h"
+
+static TAILQ_HEAD(, defined_value)	defined_values;
+
+static const char *
+defined_find(const char *name)
+{
+	struct defined_value *d;
+
+	TAILQ_FOREACH(d, &defined_values, d_next) {
+		if (strcmp(d->d_name, name) == 0)
+			return (d->d_value);
+	}
+
+	return (NULL);
+}
+
+char *
+defined_expand(const char *string)
+{
+	const char *value;
+	char c, *expanded, *name;
+	int i, ret, before_len = 0, name_off = 0, name_len = 0, after_off = 0;
+	bool backslashed = false, bracketed = false;
+
+	expanded = checked_strdup(string);
+
+	for (i = 0; string[i] != '\0'; i++) {
+		c = string[i];
+		if (c == '\\' && backslashed == false) {
+			backslashed = true;
+			continue;
+		}
+		if (backslashed) {
+			backslashed = false;
+			continue;
+		}
+		backslashed = false;
+		if (c != '$')
+			continue;
+
+		/*
+		 * The 'before_len' variable contains the number
+		 * of characters before the '$'.
+		 */
+		before_len = i;
+		assert(i + 1 < (int)strlen(string));
+		if (string[i + 1] == '{')
+			bracketed = true;
+
+		if (string[i + 1] == '\0') {
+			log_warnx("truncated variable");
+			return (NULL);
+		}
+
+		/*
+		 * Skip '$'.
+		 */
+		i++;
+
+		if (bracketed) {
+			if (string[i + 1] == '\0') {
+				log_warnx("truncated variable");
+				return (NULL);
+			}
+
+			/*
+			 * Skip '{'.
+			 */
+			i++;
+		}
+
+		/*
+		 * The 'name_off' variable contains the number
+		 * of characters before the variable name,
+		 * including the "$" or "${".
+		 */
+		name_off = i;
+
+		for (; string[i] != '\0'; i++) {
+			c = string[i];
+			/*
+			 * XXX: Decide on the set of characters that can be
+			 *	used in a variable name.
+			 */
+			if (isalnum(c) || c == '_')
+				continue;
+
+			/*
+			 * End of variable name.
+			 */
+			if (bracketed) {
+				if (c != '}')
+					continue;
+
+				/*
+				 * The 'after_off' variable contains the number
+				 * of characters before the rest of the string,
+				 * i.e. after the variable name.
+				 */
+				after_off = i + 1;
+				assert(i > 1);
+				assert(i - 1 > name_off);
+				name_len = i - name_off;
+				break;
+			}
+
+			after_off = i;
+			assert(i > 1);
+			assert(i > name_off);
+			name_len = i - name_off;
+			break;
+		}
+
+		name = strndup(string + name_off, name_len);
+		if (name == NULL)
+			log_err(1, "strndup");
+		value = defined_find(name);
+		if (value == NULL) {
+			log_warnx("undefined variable ${%s}", name);
+			return (NULL);
+		}
+
+		/*
+		 * Concatenate it back.
+		 */
+		ret = asprintf(&expanded, "%.*s%s%s",
+		    before_len, string, value, string + after_off);
+		if (ret < 0)
+			log_err(1, "asprintf");
+
+		//log_debugx("\"%s\" expanded to \"%s\"", string, expanded);
+		free(name);
+
+		/*
+		 * Figure out where to start searching for next variable.
+		 */
+		string = expanded;
+		i = before_len + strlen(value);
+		backslashed = bracketed = false;
+		before_len = name_off = name_len = after_off = 0;
+		assert(i <= (int)strlen(string));
+	}
+
+	if (before_len != 0 || name_off != 0 || name_len != 0 || after_off != 0) {
+		log_warnx("truncated variable");
+		return (NULL);
+	}
+
+	return (expanded);
+}
+
+static void
+defined_add(const char *name, const char *value)
+{
+	struct defined_value *d;
+	const char *found;
+
+	found = defined_find(name);
+	if (found != NULL)
+		log_errx(1, "variable %s already defined", name);
+
+	log_debugx("defining variable %s=%s", name, value);
+
+	d = calloc(sizeof(*d), 1);
+	if (d == NULL)
+		log_err(1, "calloc");
+	d->d_name = checked_strdup(name);
+	d->d_value = checked_strdup(value);
+
+	TAILQ_INSERT_TAIL(&defined_values, d, d_next);
+}
+
+void
+defined_parse_and_add(char *def)
+{
+	char *name, *value;
+
+	value = def;
+	name = strsep(&value, "=");
+
+	if (value == NULL || value[0] == '\0')
+		log_errx(1, "missing variable value");
+	if (name == NULL || name[0] == '\0')
+		log_errx(1, "missing variable name");
+
+	defined_add(name, value);
+}
+
+void
+defined_init(void)
+{
+	struct utsname name;
+	int error;
+
+	TAILQ_INIT(&defined_values);
+
+	error = uname(&name);
+	if (error != 0)
+		log_err(1, "uname");
+
+	defined_add("ARCH", name.machine);
+	defined_add("CPU", name.machine);
+	defined_add("HOST", name.nodename);
+	defined_add("OSNAME", name.sysname);
+	defined_add("OSREL", name.release);
+	defined_add("OSVERS", name.version);
+}