aboutsummaryrefslogtreecommitdiff
path: root/src/librc/librc-misc.c
blob: 2dab1249a2da034ae7e0d53b71b909c746ddc62b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
/*
 * rc-misc.c
 * rc misc functions
*/

/*
 * Copyright (c) 2007-2015 The OpenRC Authors.
 * See the Authors file at the top-level directory of this distribution and
 * https://github.com/OpenRC/openrc/blob/HEAD/AUTHORS
 *
 * This file is part of OpenRC. It is subject to the license terms in
 * the LICENSE file found in the top-level directory of this
 * distribution and at https://github.com/OpenRC/openrc/blob/HEAD/LICENSE
 * This file may not be copied, modified, propagated, or distributed
 *    except according to the terms contained in the LICENSE file.
 */

#include <fnmatch.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/stat.h>

#include "queue.h"
#include "librc.h"
#include "helpers.h"
#include "misc.h"

bool
rc_yesno(const char *value)
{
	if (!value) {
		errno = ENOENT;
		return false;
	}

	if (strcasecmp(value, "yes") == 0 ||
	    strcasecmp(value, "y") == 0 ||
	    strcasecmp(value, "true") == 0 ||
	    strcasecmp(value, "1") == 0)
		return true;

	if (strcasecmp(value, "no") != 0 &&
	    strcasecmp(value, "n") != 0 &&
	    strcasecmp(value, "false") != 0 &&
	    strcasecmp(value, "0") != 0)
		errno = EINVAL;

	return false;
}


/**
 * Read the entire @file into the buffer and set @len to the
 * size of the buffer when finished. For C strings, this will
 * be strlen(buffer) + 1.
 * Don't forget to free the buffer afterwards!
 */
bool
rc_getfile(const char *file, char **buffer, size_t *len)
{
	bool ret = false;
	FILE *fp;
	int fd;
	struct stat st;
	size_t done, left;

	fp = fopen(file, "re");
	if (!fp)
		return false;

	/* assume fileno() never fails */
	fd = fileno(fp);

	if (fstat(fd, &st))
		goto finished;

	left = st.st_size;
	*len = left + 1; /* NUL terminator */
	*buffer = xrealloc(*buffer, *len);
	while (left) {
		done = fread(*buffer, sizeof(*buffer[0]), left, fp);
		if (done == 0 && ferror(fp))
			goto finished;
		left -= done;
	}
	ret = true;

 finished:
	if (!ret) {
		free(*buffer);
		*len = 0;
	} else
		(*buffer)[*len - 1] = '\0';
	fclose(fp);
	return ret;
}

ssize_t
rc_getline(char **line, size_t *len, FILE *fp)
{
	char *p;
	size_t last = 0;

	while (!feof(fp)) {
		if (*line == NULL || last != 0) {
			*len += BUFSIZ;
			*line = xrealloc(*line, *len);
		}
		p = *line + last;
		memset(p, 0, BUFSIZ);
		if (fgets(p, BUFSIZ, fp) == NULL)
			break;
		last += strlen(p);
		if (last && (*line)[last - 1] == '\n') {
			(*line)[last - 1] = '\0';
			break;
		}
	}
	return last;
}

char *
rc_proc_getent(const char *ent RC_UNUSED)
{
#ifdef __linux__
	FILE *fp;
	char *proc, *p, *value = NULL;
	size_t i, len;

	if (!exists("/proc/cmdline"))
		return NULL;

	if (!(fp = fopen("/proc/cmdline", "r")))
		return NULL;

	proc = NULL;
	i = 0;
	if (rc_getline(&proc, &i, fp) == -1 || proc == NULL)
		return NULL;

	if (proc != NULL) {
		len = strlen(ent);

		while ((p = strsep(&proc, " "))) {
			if (strncmp(ent, p, len) == 0 && (p[len] == '\0' || p[len] == ' ' || p[len] == '=')) {
				p += len;

				if (*p == '=')
					p++;

				value = xstrdup(p);
			}
		}
	}

	if (!value)
		errno = ENOENT;

	fclose(fp);
	free(proc);

	return value;
#else
	return NULL;
#endif
}

RC_STRINGLIST *
rc_config_list(const char *file)
{
	FILE *fp;
	char *buffer = NULL;
	size_t len = 0;
	char *p;
	char *token;
	RC_STRINGLIST *list = rc_stringlist_new();

	if (!(fp = fopen(file, "r")))
		return list;

	while ((rc_getline(&buffer, &len, fp))) {
		p = buffer;
		/* Strip leading spaces/tabs */
		while ((*p == ' ') || (*p == '\t'))
			p++;

		/* Get entry - we do not want comments */
		token = strsep(&p, "#");
		if (token && (strlen(token) > 1)) {
			/* If not variable assignment then skip */
			if (strchr(token, '=')) {
				/* Strip the newline if present */
				if (token[strlen(token) - 1] == '\n')
					token[strlen(token) - 1] = 0;

				rc_stringlist_add(list, token);
			}
		}
	}
	fclose(fp);
	free(buffer);

	return list;
}

static void rc_config_set_value(RC_STRINGLIST *config, char *value)
{
	RC_STRING *cline;
	char *entry;
	size_t i = 0;
	char *newline;
	char *p = value;
	bool replaced;
	char *token;

	if (!p)
		return;
	if (strncmp(p, "export ", 7) == 0)
		p += 7;
	if (!(token = strsep(&p, "=")))
		return;

	entry = xstrdup(token);
	/* Preserve shell coloring */
	if (*p == '$')
		token = value;
	else
		do {
			/* Bash variables are usually quoted */
			token = strsep(&p, "\"\'");
		} while (token && *token == '\0');

	/* Drop a newline if that's all we have */
	if (token) {
		i = strlen(token) - 1;
		if (token[i] == '\n')
			token[i] = 0;

		xasprintf(&newline, "%s=%s", entry, token);
	} else {
		xasprintf(&newline, "%s=", entry);
	}

	replaced = false;
	/* In shells the last item takes precedence, so we need to remove
	   any prior values we may already have */
	TAILQ_FOREACH(cline, config, entries) {
		i = strlen(entry);
		if (strncmp(entry, cline->value, i) == 0 && cline->value[i] == '=') {
			/* We have a match now - to save time we directly replace it */
			free(cline->value);
			cline->value = newline;
			replaced = true;
			break;
		}
	}

	if (!replaced) {
		rc_stringlist_add(config, newline);
		free(newline);
	}
	free(entry);
}

/*
 * Override some specific rc.conf options on the kernel command line.
 * I only know how to do this in Linux, so if someone wants to supply
 * a patch for this on *BSD or tell me how to write the code to do this,
 * any suggestions are welcome.
 */
static RC_STRINGLIST *rc_config_kcl(RC_STRINGLIST *config)
{
#ifdef __linux__
	RC_STRINGLIST *overrides;
	RC_STRING *cline, *override, *config_np;
	char *tmp = NULL;
	char *value = NULL;
	size_t varlen = 0;

	overrides = rc_stringlist_new();

	/* A list of variables which may be overridden on the kernel command line */
	rc_stringlist_add(overrides, "rc_interactive");
	rc_stringlist_add(overrides, "rc_parallel");

	TAILQ_FOREACH(override, overrides, entries) {
		varlen = strlen(override->value);
		value = rc_proc_getent(override->value);

		/* No need to continue if there's nothing to override */
		if (!value) {
			free(value);
			continue;
		}

		if (value != NULL) {
			xasprintf(&tmp, "%s=%s", override->value, value);
		}

		/*
		 * Whenever necessary remove the old config entry first to prevent
		 * duplicates
		 */
		TAILQ_FOREACH_SAFE(cline, config, entries, config_np) {
			if (strncmp(override->value, cline->value, varlen) == 0
				&& cline->value[varlen] == '=') {
				rc_stringlist_delete(config, cline->value);
				break;
			}
		}

		/* Add the option (var/value) to the current config */
		rc_stringlist_add(config, tmp);

		free(tmp);
		free(value);
	}

	rc_stringlist_free(overrides);
#endif
	return config;
}

static RC_STRINGLIST * rc_config_directory(RC_STRINGLIST *config)
{
	DIR *dp;
	struct dirent *d;
	RC_STRINGLIST *rc_conf_d_files = rc_stringlist_new();
	RC_STRING *fname;
	RC_STRINGLIST *rc_conf_d_list;
	char path[PATH_MAX];
	RC_STRING *line;

	if ((dp = opendir(RC_CONF_D)) != NULL) {
		while ((d = readdir(dp)) != NULL) {
			if (fnmatch("*.conf", d->d_name, FNM_PATHNAME) == 0) {
				rc_stringlist_addu(rc_conf_d_files, d->d_name);
			}
		}
		closedir(dp);

		if (rc_conf_d_files) {
			rc_stringlist_sort(&rc_conf_d_files);
			TAILQ_FOREACH(fname, rc_conf_d_files, entries) {
				if (!fname->value)
					continue;
				sprintf(path, "%s/%s", RC_CONF_D, fname->value);
				rc_conf_d_list = rc_config_list(path);
				TAILQ_FOREACH(line, rc_conf_d_list, entries)
					if (line->value)
						rc_config_set_value(config, line->value);
				rc_stringlist_free(rc_conf_d_list);
			}
			rc_stringlist_free(rc_conf_d_files);
		}
	}
	return config;
}

#ifdef RC_USER_SERVICES
static RC_STRINGLIST * rc_user_config_directory(RC_STRINGLIST *config)
{
	DIR *dp;
	struct dirent *d;
	RC_STRINGLIST *rc_conf_d_files = rc_stringlist_new();
	RC_STRING *fname;
	RC_STRINGLIST *rc_conf_d_list;
	char path[PATH_MAX];
	RC_STRING *line;
	char *sysconf = rc_user_sysconfdir();
	char *user_conf_d;

	xasprintf(&user_conf_d, "%s/%s", sysconf, RC_USER_CONF_D);

	if ((dp = opendir(user_conf_d)) != NULL) {
		while ((d = readdir(dp)) != NULL) {
			if (fnmatch("*.conf", d->d_name, FNM_PATHNAME) == 0) {
				rc_stringlist_addu(rc_conf_d_files, d->d_name);
			}
		}
		closedir(dp);

		if (rc_conf_d_files) {
			rc_stringlist_sort(&rc_conf_d_files);
			TAILQ_FOREACH(fname, rc_conf_d_files, entries) {
				if (!fname->value)
					continue;
				sprintf(path, "%s/%s", user_conf_d, fname->value);
				rc_conf_d_list = rc_config_list(path);
				TAILQ_FOREACH(line, rc_conf_d_list, entries)
					if (line->value)
						rc_config_set_value(config, line->value);
				rc_stringlist_free(rc_conf_d_list);
			}
			rc_stringlist_free(rc_conf_d_files);
		}
	}

	free(sysconf);
	free(user_conf_d);
	return config;
}

#endif

RC_STRINGLIST *
rc_config_load(const char *file)
{
	RC_STRINGLIST *list;
	RC_STRINGLIST *config;
	RC_STRING *line;

	list = rc_config_list(file);
	config = rc_stringlist_new();
	TAILQ_FOREACH(line, list, entries) {
		rc_config_set_value(config, line->value);
	}
	rc_stringlist_free(list);

	return config;
}

char *
rc_config_value(RC_STRINGLIST *list, const char *entry)
{
	RC_STRING *line;
	char *p;
	size_t len;

	len = strlen(entry);
	TAILQ_FOREACH(line, list, entries) {
		p = strchr(line->value, '=');
		if (p != NULL) {
			if (strncmp(entry, line->value, len) == 0 && line->value[len] == '=')
				return ++p;
		}
	}
	return NULL;
}

/* Global for caching the strings loaded from rc.conf to avoid reparsing for
 * each rc_conf_value call */
static RC_STRINGLIST *rc_conf = NULL;

static void
_free_rc_conf(void)
{
	rc_stringlist_free(rc_conf);
}

char *
rc_conf_value(const char *setting)
{
	RC_STRINGLIST *system, *old;
	RC_STRING *s;
	char *p;
#ifdef RC_USER_SERVICES
	RC_STRINGLIST *user;
	char *userconf, *user_sysconf;
#endif

	if (!rc_conf) {
		rc_conf = rc_stringlist_new();

#ifdef RC_USER_SERVICES
		if (rc_is_user()) {
			user_sysconf = rc_user_sysconfdir();
			xasprintf(&userconf, "%s/%s", user_sysconf, RC_USER_CONF);

			user = rc_config_load(userconf);
			TAILQ_CONCAT(rc_conf, user, entries);
			rc_stringlist_free(user);

			free(userconf);
			free(user_sysconf);

			rc_user_config_directory(rc_conf);
		}
#endif

		system = rc_config_load(RC_CONF);
		TAILQ_CONCAT(rc_conf, system, entries);
		rc_stringlist_free(system);

		atexit(_free_rc_conf);

		/* Support old configs. */
		if (exists(RC_CONF_OLD)) {
			old = rc_config_load(RC_CONF_OLD);
			TAILQ_CONCAT(rc_conf, old, entries);
			rc_stringlist_free(old);
		}

		rc_conf = rc_config_directory(rc_conf);
		rc_conf = rc_config_kcl(rc_conf);

		/* Convert old uppercase to lowercase */
		TAILQ_FOREACH(s, rc_conf, entries) {
			p = s->value;
			while (p && *p && *p != '=') {
				if (isupper((unsigned char)*p))
					*p = tolower((unsigned char)*p);
				p++;
			}
		}
	}

	return rc_config_value(rc_conf, setting);
}