1 /*
2  * Copyright (c)2004 The DragonFly Project.  All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  *
8  *   Redistributions of source code must retain the above copyright
9  *   notice, this list of conditions and the following disclaimer.
10  *
11  *   Redistributions in binary form must reproduce the above copyright
12  *   notice, this list of conditions and the following disclaimer in
13  *   the documentation and/or other materials provided with the
14  *   distribution.
15  *
16  *   Neither the name of the DragonFly Project nor the names of its
17  *   contributors may be used to endorse or promote products derived
18  *   from this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
26  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
27  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
29  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
31  * OF THE POSSIBILITY OF SUCH DAMAGE.
32  */
33 
34 /*
35  * confed.c
36  * Functions for working with configuration files.
37  * Inspired by (but not derived from) sysinstall's variable.c
38  * $Id: confed.c,v 1.16 2005/02/06 21:05:18 cpressey Exp $
39  */
40 
41 #include <sys/stat.h>
42 
43 #include <ctype.h>
44 #include <stdarg.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <string.h>
48 #include <time.h>
49 #include <unistd.h>
50 
51 #include "libaura/mem.h"
52 #include "libaura/dict.h"
53 #include "libdfui/system.h"
54 
55 #include "confed.h"
56 #include "commands.h"
57 #include "functions.h"
58 
59 /*
60  * Create a new, empty set of in-memory config variable settings.
61  */
62 struct config_vars *
63 config_vars_new(void)
64 {
65 	struct config_vars *cvs;
66 
67 	AURA_MALLOC(cvs, config_vars);
68 
69 	cvs->d = aura_dict_new(1, AURA_DICT_SORTED_LIST);
70 
71 	return(cvs);
72 }
73 
74 /*
75  * Deallocate the memory used by a set of config variable settings.
76  */
77 void
78 config_vars_free(struct config_vars *cvs)
79 {
80 	if (cvs == NULL)
81 		return;
82 
83 	aura_dict_free(cvs->d);
84 
85 	AURA_FREE(cvs, config_vars);
86 }
87 
88 /*
89  * Get the value of a configuration variable in a set of settings
90  * and return it, or a (constant) 0-length string if not found.
91  */
92 const char *
93 config_var_get(const struct config_vars *cvs, const char *name)
94 {
95 	void *rv;
96 	size_t rv_len;
97 
98 	aura_dict_fetch(cvs->d, name, strlen(name) + 1, &rv, &rv_len);
99 	if (rv == NULL)
100 		return("");
101 	else
102 		return(rv);
103 }
104 
105 /*
106  * Set the value of a configuration variable.  If the named variable
107  * does not exist within the given set, a new one is created.
108  */
109 int
110 config_var_set(struct config_vars *cvs, const char *name, const char *value)
111 {
112 	aura_dict_store(cvs->d,
113 	    name, strlen(name) + 1,
114 	    value, strlen(value) + 1);
115 	return(1);
116 }
117 
118 /*
119  * Write a set of configuration variable settings to a file.
120  */
121 int
122 config_vars_write(const struct config_vars *cvs, int config_type,
123     const char *fmt, ...)
124 {
125 	FILE *f;
126 	va_list args;
127 	char *filename;
128 	void *rk, *rv;
129 	size_t rk_len, rv_len;
130 
131 	va_start(args, fmt);
132 	vasprintf(&filename, fmt, args);
133 	va_end(args);
134 
135 	if ((f = fopen(filename, "a")) == NULL)
136 		return(0);
137 
138 	switch (config_type) {
139 	case CONFIG_TYPE_SH:
140 
141 		aura_dict_rewind(cvs->d);
142 		while (!aura_dict_eof(cvs->d)) {
143 			aura_dict_get_current_key(cvs->d, &rk, &rk_len),
144 			aura_dict_fetch(cvs->d, rk, rk_len, &rv, &rv_len);
145 			fprintf(f, "%s=\"%s\"\t# via installer configuration\n",
146 			    (char *)rk, (char *)rv);
147 			aura_dict_next(cvs->d);
148 		}
149 		break;
150 	case CONFIG_TYPE_RESOLV:
151 		aura_dict_rewind(cvs->d);
152 		while (!aura_dict_eof(cvs->d)) {
153 			aura_dict_get_current_key(cvs->d, &rk, &rk_len),
154 			aura_dict_fetch(cvs->d, rk, rk_len, &rv, &rv_len);
155 			fprintf(f, "%s\t\t%s\n", (char *)rk, (char *)rv);
156 			aura_dict_next(cvs->d);
157 		}
158 		break;
159 	default:
160 		fclose(f);
161 		return(0);
162 	}
163 
164 	fclose(f);
165 	return(1);
166 }
167 
168 /*
169  * Read variables from a file.
170  * Returns 1 if the variables could be read successfully, 0 if not.
171  */
172 int
173 config_vars_read(struct i_fn_args *a, struct config_vars *cvs,
174 		 int config_type __unused, const char *fmt, ...)
175 {
176 	struct commands *cmds;
177 	char *filename, *tmp_filename, line[1024], *value;
178 	FILE *f, *script;
179 	va_list args;
180 
181 	va_start(args, fmt);
182 	vasprintf(&filename, fmt, args);
183 	va_end(args);
184 
185 	asprintf(&tmp_filename, "%sextract_vars", a->tmp);
186 	script = fopen(tmp_filename, "w");
187 	free(tmp_filename);
188 	if (script == NULL)
189 		return(0);
190 
191 	fprintf(script, "set | %susr/bin/sort >%senv.before\n", a->os_root, a->tmp);
192 	fprintf(script, ". %s%s\n", a->os_root, filename);
193 	fprintf(script, "set | %susr/bin/sort >%senv.after\n", a->os_root, a->tmp);
194 	fprintf(script, "%susr/bin/comm -1 -3 %senv.before %senv.after | \\\n",
195 	    a->os_root, a->tmp, a->tmp);
196 	fprintf(script, "    %susr/bin/awk -F= '{ print $1 }' | \\\n", a->os_root);
197 	fprintf(script, "    while read __VARNAME; do\n");
198 	fprintf(script, "        echo -n ${__VARNAME}=\n");
199 	fprintf(script, "        eval echo ' $'${__VARNAME}\n");
200 	fprintf(script, "    done\n");
201 	fprintf(script, "%sbin/rm -f %senv.before %senv.after\n",
202 	    a->os_root, a->tmp, a->tmp);
203 	fclose(script);
204 
205 	cmds = commands_new();
206 	command_add(cmds, "%sbin/sh %sextract_vars >%sextracted_vars.txt",
207 	    a->os_root, a->tmp, a->tmp);
208 	temp_file_add(a, "extracted_vars.txt");
209 	if (!commands_execute(a, cmds)) {
210 		commands_free(cmds);
211 		return(0);
212 	}
213 	commands_free(cmds);
214 
215 	/*
216 	 * Delete the script immediately.
217 	 */
218 	asprintf(&tmp_filename, "%sextract_vars", a->tmp);
219 	(void)unlink(tmp_filename);	/* not much we can do if it fails */
220 	free(tmp_filename);
221 
222 	asprintf(&tmp_filename, "%sextracted_vars.txt", a->tmp);
223 	f = fopen(tmp_filename, "r");
224 	free(tmp_filename);
225 	if (f == NULL)
226 		return(0);
227 	while (fgets(line, 1024, f) != NULL) {
228 		if (strlen(line) > 0)
229 			line[strlen(line) - 1] = '\0';
230 		/* split line at first = */
231 		for (value = line; *value != '=' && *value != '\0'; value++)
232 			;
233 		if (*value == '\0')
234 			break;
235 		*value = '\0';
236 		value++;
237 		config_var_set(cvs, line, value);
238 	}
239 	fclose(f);
240 
241 	return(1);
242 }
243