xref: /freebsd/usr.sbin/autofs/defined.c (revision abdd3945643eddffa0f4a9e3c9ef30e0fd8ff69e) 
13914ddf8SEdward Tomasz Napierala /*-
2*abdd3945SEdward Tomasz Napierala  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3*abdd3945SEdward Tomasz Napierala  *
43914ddf8SEdward Tomasz Napierala  * Copyright (c) 2014 The FreeBSD Foundation
53914ddf8SEdward Tomasz Napierala  * All rights reserved.
63914ddf8SEdward Tomasz Napierala  *
73914ddf8SEdward Tomasz Napierala  * This software was developed by Edward Tomasz Napierala under sponsorship
83914ddf8SEdward Tomasz Napierala  * from the FreeBSD Foundation.
93914ddf8SEdward Tomasz Napierala  *
103914ddf8SEdward Tomasz Napierala  * Redistribution and use in source and binary forms, with or without
113914ddf8SEdward Tomasz Napierala  * modification, are permitted provided that the following conditions
123914ddf8SEdward Tomasz Napierala  * are met:
133914ddf8SEdward Tomasz Napierala  * 1. Redistributions of source code must retain the above copyright
143914ddf8SEdward Tomasz Napierala  *    notice, this list of conditions and the following disclaimer.
153914ddf8SEdward Tomasz Napierala  * 2. Redistributions in binary form must reproduce the above copyright
163914ddf8SEdward Tomasz Napierala  *    notice, this list of conditions and the following disclaimer in the
173914ddf8SEdward Tomasz Napierala  *    documentation and/or other materials provided with the distribution.
183914ddf8SEdward Tomasz Napierala  *
193914ddf8SEdward Tomasz Napierala  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
203914ddf8SEdward Tomasz Napierala  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
213914ddf8SEdward Tomasz Napierala  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
223914ddf8SEdward Tomasz Napierala  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
233914ddf8SEdward Tomasz Napierala  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
243914ddf8SEdward Tomasz Napierala  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
253914ddf8SEdward Tomasz Napierala  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
263914ddf8SEdward Tomasz Napierala  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
273914ddf8SEdward Tomasz Napierala  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
283914ddf8SEdward Tomasz Napierala  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
293914ddf8SEdward Tomasz Napierala  * SUCH DAMAGE.
303914ddf8SEdward Tomasz Napierala  *
313914ddf8SEdward Tomasz Napierala  */
323914ddf8SEdward Tomasz Napierala 
333914ddf8SEdward Tomasz Napierala /*
343914ddf8SEdward Tomasz Napierala  * All the "defined" stuff is for handling variables,
353914ddf8SEdward Tomasz Napierala  * such as ${OSNAME}, in maps.
363914ddf8SEdward Tomasz Napierala  */
373914ddf8SEdward Tomasz Napierala 
38925fd945SEdward Tomasz Napierala #include <sys/cdefs.h>
39925fd945SEdward Tomasz Napierala __FBSDID("$FreeBSD$");
40925fd945SEdward Tomasz Napierala 
413914ddf8SEdward Tomasz Napierala #include <sys/types.h>
423914ddf8SEdward Tomasz Napierala #include <sys/time.h>
433914ddf8SEdward Tomasz Napierala #include <sys/ioctl.h>
443914ddf8SEdward Tomasz Napierala #include <sys/param.h>
453914ddf8SEdward Tomasz Napierala #include <sys/linker.h>
463914ddf8SEdward Tomasz Napierala #include <sys/mount.h>
473914ddf8SEdward Tomasz Napierala #include <sys/socket.h>
483914ddf8SEdward Tomasz Napierala #include <sys/stat.h>
493914ddf8SEdward Tomasz Napierala #include <sys/wait.h>
503914ddf8SEdward Tomasz Napierala #include <sys/utsname.h>
513914ddf8SEdward Tomasz Napierala #include <assert.h>
523914ddf8SEdward Tomasz Napierala #include <ctype.h>
533914ddf8SEdward Tomasz Napierala #include <errno.h>
543914ddf8SEdward Tomasz Napierala #include <fcntl.h>
553914ddf8SEdward Tomasz Napierala #include <libgen.h>
56592d6e85SEdward Tomasz Napierala #include <libutil.h>
573914ddf8SEdward Tomasz Napierala #include <netdb.h>
583914ddf8SEdward Tomasz Napierala #include <signal.h>
593914ddf8SEdward Tomasz Napierala #include <stdbool.h>
603914ddf8SEdward Tomasz Napierala #include <stdint.h>
613914ddf8SEdward Tomasz Napierala #include <stdio.h>
623914ddf8SEdward Tomasz Napierala #include <stdlib.h>
633914ddf8SEdward Tomasz Napierala #include <string.h>
643914ddf8SEdward Tomasz Napierala #include <unistd.h>
653914ddf8SEdward Tomasz Napierala 
663914ddf8SEdward Tomasz Napierala #include "common.h"
673914ddf8SEdward Tomasz Napierala 
683914ddf8SEdward Tomasz Napierala static TAILQ_HEAD(, defined_value)	defined_values;
693914ddf8SEdward Tomasz Napierala 
703914ddf8SEdward Tomasz Napierala static const char *
713914ddf8SEdward Tomasz Napierala defined_find(const char *name)
723914ddf8SEdward Tomasz Napierala {
733914ddf8SEdward Tomasz Napierala 	struct defined_value *d;
743914ddf8SEdward Tomasz Napierala 
753914ddf8SEdward Tomasz Napierala 	TAILQ_FOREACH(d, &defined_values, d_next) {
763914ddf8SEdward Tomasz Napierala 		if (strcmp(d->d_name, name) == 0)
773914ddf8SEdward Tomasz Napierala 			return (d->d_value);
783914ddf8SEdward Tomasz Napierala 	}
793914ddf8SEdward Tomasz Napierala 
803914ddf8SEdward Tomasz Napierala 	return (NULL);
813914ddf8SEdward Tomasz Napierala }
823914ddf8SEdward Tomasz Napierala 
833914ddf8SEdward Tomasz Napierala char *
843914ddf8SEdward Tomasz Napierala defined_expand(const char *string)
853914ddf8SEdward Tomasz Napierala {
863914ddf8SEdward Tomasz Napierala 	const char *value;
873914ddf8SEdward Tomasz Napierala 	char c, *expanded, *name;
883914ddf8SEdward Tomasz Napierala 	int i, ret, before_len = 0, name_off = 0, name_len = 0, after_off = 0;
893914ddf8SEdward Tomasz Napierala 	bool backslashed = false, bracketed = false;
903914ddf8SEdward Tomasz Napierala 
913914ddf8SEdward Tomasz Napierala 	expanded = checked_strdup(string);
923914ddf8SEdward Tomasz Napierala 
933914ddf8SEdward Tomasz Napierala 	for (i = 0; string[i] != '\0'; i++) {
943914ddf8SEdward Tomasz Napierala 		c = string[i];
953914ddf8SEdward Tomasz Napierala 		if (c == '\\' && backslashed == false) {
963914ddf8SEdward Tomasz Napierala 			backslashed = true;
973914ddf8SEdward Tomasz Napierala 			continue;
983914ddf8SEdward Tomasz Napierala 		}
993914ddf8SEdward Tomasz Napierala 		if (backslashed) {
1003914ddf8SEdward Tomasz Napierala 			backslashed = false;
1013914ddf8SEdward Tomasz Napierala 			continue;
1023914ddf8SEdward Tomasz Napierala 		}
1033914ddf8SEdward Tomasz Napierala 		backslashed = false;
1043914ddf8SEdward Tomasz Napierala 		if (c != '$')
1053914ddf8SEdward Tomasz Napierala 			continue;
1063914ddf8SEdward Tomasz Napierala 
1073914ddf8SEdward Tomasz Napierala 		/*
1083914ddf8SEdward Tomasz Napierala 		 * The 'before_len' variable contains the number
1093914ddf8SEdward Tomasz Napierala 		 * of characters before the '$'.
1103914ddf8SEdward Tomasz Napierala 		 */
1113914ddf8SEdward Tomasz Napierala 		before_len = i;
1123914ddf8SEdward Tomasz Napierala 		assert(i + 1 < (int)strlen(string));
1133914ddf8SEdward Tomasz Napierala 		if (string[i + 1] == '{')
1143914ddf8SEdward Tomasz Napierala 			bracketed = true;
1153914ddf8SEdward Tomasz Napierala 
1163914ddf8SEdward Tomasz Napierala 		if (string[i + 1] == '\0') {
1173914ddf8SEdward Tomasz Napierala 			log_warnx("truncated variable");
1183914ddf8SEdward Tomasz Napierala 			return (NULL);
1193914ddf8SEdward Tomasz Napierala 		}
1203914ddf8SEdward Tomasz Napierala 
1213914ddf8SEdward Tomasz Napierala 		/*
1223914ddf8SEdward Tomasz Napierala 		 * Skip '$'.
1233914ddf8SEdward Tomasz Napierala 		 */
1243914ddf8SEdward Tomasz Napierala 		i++;
1253914ddf8SEdward Tomasz Napierala 
1263914ddf8SEdward Tomasz Napierala 		if (bracketed) {
1273914ddf8SEdward Tomasz Napierala 			if (string[i + 1] == '\0') {
1283914ddf8SEdward Tomasz Napierala 				log_warnx("truncated variable");
1293914ddf8SEdward Tomasz Napierala 				return (NULL);
1303914ddf8SEdward Tomasz Napierala 			}
1313914ddf8SEdward Tomasz Napierala 
1323914ddf8SEdward Tomasz Napierala 			/*
1333914ddf8SEdward Tomasz Napierala 			 * Skip '{'.
1343914ddf8SEdward Tomasz Napierala 			 */
1353914ddf8SEdward Tomasz Napierala 			i++;
1363914ddf8SEdward Tomasz Napierala 		}
1373914ddf8SEdward Tomasz Napierala 
1383914ddf8SEdward Tomasz Napierala 		/*
1393914ddf8SEdward Tomasz Napierala 		 * The 'name_off' variable contains the number
1403914ddf8SEdward Tomasz Napierala 		 * of characters before the variable name,
1413914ddf8SEdward Tomasz Napierala 		 * including the "$" or "${".
1423914ddf8SEdward Tomasz Napierala 		 */
1433914ddf8SEdward Tomasz Napierala 		name_off = i;
1443914ddf8SEdward Tomasz Napierala 
1453914ddf8SEdward Tomasz Napierala 		for (; string[i] != '\0'; i++) {
1463914ddf8SEdward Tomasz Napierala 			c = string[i];
1473914ddf8SEdward Tomasz Napierala 			/*
1483914ddf8SEdward Tomasz Napierala 			 * XXX: Decide on the set of characters that can be
1493914ddf8SEdward Tomasz Napierala 			 *	used in a variable name.
1503914ddf8SEdward Tomasz Napierala 			 */
1513914ddf8SEdward Tomasz Napierala 			if (isalnum(c) || c == '_')
1523914ddf8SEdward Tomasz Napierala 				continue;
1533914ddf8SEdward Tomasz Napierala 
1543914ddf8SEdward Tomasz Napierala 			/*
1553914ddf8SEdward Tomasz Napierala 			 * End of variable name.
1563914ddf8SEdward Tomasz Napierala 			 */
1573914ddf8SEdward Tomasz Napierala 			if (bracketed) {
1583914ddf8SEdward Tomasz Napierala 				if (c != '}')
1593914ddf8SEdward Tomasz Napierala 					continue;
1603914ddf8SEdward Tomasz Napierala 
1613914ddf8SEdward Tomasz Napierala 				/*
1623914ddf8SEdward Tomasz Napierala 				 * The 'after_off' variable contains the number
1633914ddf8SEdward Tomasz Napierala 				 * of characters before the rest of the string,
1643914ddf8SEdward Tomasz Napierala 				 * i.e. after the variable name.
1653914ddf8SEdward Tomasz Napierala 				 */
1663914ddf8SEdward Tomasz Napierala 				after_off = i + 1;
1673914ddf8SEdward Tomasz Napierala 				assert(i > 1);
1683914ddf8SEdward Tomasz Napierala 				assert(i - 1 > name_off);
1693914ddf8SEdward Tomasz Napierala 				name_len = i - name_off;
1703914ddf8SEdward Tomasz Napierala 				break;
1713914ddf8SEdward Tomasz Napierala 			}
1723914ddf8SEdward Tomasz Napierala 
1733914ddf8SEdward Tomasz Napierala 			after_off = i;
1743914ddf8SEdward Tomasz Napierala 			assert(i > 1);
1753914ddf8SEdward Tomasz Napierala 			assert(i > name_off);
1763914ddf8SEdward Tomasz Napierala 			name_len = i - name_off;
1773914ddf8SEdward Tomasz Napierala 			break;
1783914ddf8SEdward Tomasz Napierala 		}
1793914ddf8SEdward Tomasz Napierala 
1803914ddf8SEdward Tomasz Napierala 		name = strndup(string + name_off, name_len);
1813914ddf8SEdward Tomasz Napierala 		if (name == NULL)
1823914ddf8SEdward Tomasz Napierala 			log_err(1, "strndup");
1833914ddf8SEdward Tomasz Napierala 		value = defined_find(name);
1843914ddf8SEdward Tomasz Napierala 		if (value == NULL) {
1853914ddf8SEdward Tomasz Napierala 			log_warnx("undefined variable ${%s}", name);
1863914ddf8SEdward Tomasz Napierala 			return (NULL);
1873914ddf8SEdward Tomasz Napierala 		}
1883914ddf8SEdward Tomasz Napierala 
1893914ddf8SEdward Tomasz Napierala 		/*
1903914ddf8SEdward Tomasz Napierala 		 * Concatenate it back.
1913914ddf8SEdward Tomasz Napierala 		 */
1923914ddf8SEdward Tomasz Napierala 		ret = asprintf(&expanded, "%.*s%s%s",
1933914ddf8SEdward Tomasz Napierala 		    before_len, string, value, string + after_off);
1943914ddf8SEdward Tomasz Napierala 		if (ret < 0)
1953914ddf8SEdward Tomasz Napierala 			log_err(1, "asprintf");
1963914ddf8SEdward Tomasz Napierala 
1973914ddf8SEdward Tomasz Napierala 		//log_debugx("\"%s\" expanded to \"%s\"", string, expanded);
1983914ddf8SEdward Tomasz Napierala 		free(name);
1993914ddf8SEdward Tomasz Napierala 
2003914ddf8SEdward Tomasz Napierala 		/*
2013914ddf8SEdward Tomasz Napierala 		 * Figure out where to start searching for next variable.
2023914ddf8SEdward Tomasz Napierala 		 */
2033914ddf8SEdward Tomasz Napierala 		string = expanded;
2043914ddf8SEdward Tomasz Napierala 		i = before_len + strlen(value);
2053914ddf8SEdward Tomasz Napierala 		backslashed = bracketed = false;
2063914ddf8SEdward Tomasz Napierala 		before_len = name_off = name_len = after_off = 0;
2073914ddf8SEdward Tomasz Napierala 		assert(i <= (int)strlen(string));
2083914ddf8SEdward Tomasz Napierala 	}
2093914ddf8SEdward Tomasz Napierala 
2103914ddf8SEdward Tomasz Napierala 	if (before_len != 0 || name_off != 0 || name_len != 0 || after_off != 0) {
2113914ddf8SEdward Tomasz Napierala 		log_warnx("truncated variable");
2123914ddf8SEdward Tomasz Napierala 		return (NULL);
2133914ddf8SEdward Tomasz Napierala 	}
2143914ddf8SEdward Tomasz Napierala 
2153914ddf8SEdward Tomasz Napierala 	return (expanded);
2163914ddf8SEdward Tomasz Napierala }
2173914ddf8SEdward Tomasz Napierala 
2183914ddf8SEdward Tomasz Napierala static void
2193914ddf8SEdward Tomasz Napierala defined_add(const char *name, const char *value)
2203914ddf8SEdward Tomasz Napierala {
2213914ddf8SEdward Tomasz Napierala 	struct defined_value *d;
2223914ddf8SEdward Tomasz Napierala 	const char *found;
2233914ddf8SEdward Tomasz Napierala 
2243914ddf8SEdward Tomasz Napierala 	found = defined_find(name);
2253914ddf8SEdward Tomasz Napierala 	if (found != NULL)
2263914ddf8SEdward Tomasz Napierala 		log_errx(1, "variable %s already defined", name);
2273914ddf8SEdward Tomasz Napierala 
2283914ddf8SEdward Tomasz Napierala 	log_debugx("defining variable %s=%s", name, value);
2293914ddf8SEdward Tomasz Napierala 
23027525377SEdward Tomasz Napierala 	d = calloc(1, sizeof(*d));
2313914ddf8SEdward Tomasz Napierala 	if (d == NULL)
2323914ddf8SEdward Tomasz Napierala 		log_err(1, "calloc");
2333914ddf8SEdward Tomasz Napierala 	d->d_name = checked_strdup(name);
2343914ddf8SEdward Tomasz Napierala 	d->d_value = checked_strdup(value);
2353914ddf8SEdward Tomasz Napierala 
2363914ddf8SEdward Tomasz Napierala 	TAILQ_INSERT_TAIL(&defined_values, d, d_next);
2373914ddf8SEdward Tomasz Napierala }
2383914ddf8SEdward Tomasz Napierala 
2393914ddf8SEdward Tomasz Napierala void
2403914ddf8SEdward Tomasz Napierala defined_parse_and_add(char *def)
2413914ddf8SEdward Tomasz Napierala {
2423914ddf8SEdward Tomasz Napierala 	char *name, *value;
2433914ddf8SEdward Tomasz Napierala 
2443914ddf8SEdward Tomasz Napierala 	value = def;
2453914ddf8SEdward Tomasz Napierala 	name = strsep(&value, "=");
2463914ddf8SEdward Tomasz Napierala 
2473914ddf8SEdward Tomasz Napierala 	if (value == NULL || value[0] == '\0')
2483914ddf8SEdward Tomasz Napierala 		log_errx(1, "missing variable value");
2493914ddf8SEdward Tomasz Napierala 	if (name == NULL || name[0] == '\0')
2503914ddf8SEdward Tomasz Napierala 		log_errx(1, "missing variable name");
2513914ddf8SEdward Tomasz Napierala 
2523914ddf8SEdward Tomasz Napierala 	defined_add(name, value);
2533914ddf8SEdward Tomasz Napierala }
2543914ddf8SEdward Tomasz Napierala 
2553914ddf8SEdward Tomasz Napierala void
2563914ddf8SEdward Tomasz Napierala defined_init(void)
2573914ddf8SEdward Tomasz Napierala {
2583914ddf8SEdward Tomasz Napierala 	struct utsname name;
2593914ddf8SEdward Tomasz Napierala 	int error;
2603914ddf8SEdward Tomasz Napierala 
2613914ddf8SEdward Tomasz Napierala 	TAILQ_INIT(&defined_values);
2623914ddf8SEdward Tomasz Napierala 
2633914ddf8SEdward Tomasz Napierala 	error = uname(&name);
2643914ddf8SEdward Tomasz Napierala 	if (error != 0)
2653914ddf8SEdward Tomasz Napierala 		log_err(1, "uname");
2663914ddf8SEdward Tomasz Napierala 
2673914ddf8SEdward Tomasz Napierala 	defined_add("ARCH", name.machine);
2683914ddf8SEdward Tomasz Napierala 	defined_add("CPU", name.machine);
2693914ddf8SEdward Tomasz Napierala 	defined_add("HOST", name.nodename);
2703914ddf8SEdward Tomasz Napierala 	defined_add("OSNAME", name.sysname);
2713914ddf8SEdward Tomasz Napierala 	defined_add("OSREL", name.release);
2723914ddf8SEdward Tomasz Napierala 	defined_add("OSVERS", name.version);
2733914ddf8SEdward Tomasz Napierala }
274