1/*
2 * kmod-modprobe - manage linux kernel modules using libkmod.
3 *
4 * Copyright (C) 2011-2013  ProFUSION embedded systems
5 *
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <assert.h>
21#include <errno.h>
22#include <getopt.h>
23#include <limits.h>
24#include <stdbool.h>
25#include <stdio.h>
26#include <stdlib.h>
27#include <string.h>
28#include <unistd.h>
29#include <sys/stat.h>
30#include <sys/types.h>
31#include <sys/utsname.h>
32#include <sys/wait.h>
33
34#include <shared/array.h>
35#include <shared/macro.h>
36
37#include <libkmod/libkmod.h>
38
39#include "kmod.h"
40
41static int log_priority = LOG_CRIT;
42static int use_syslog = 0;
43#define LOG(...) log_printf(log_priority, __VA_ARGS__)
44
45#define DEFAULT_VERBOSE LOG_WARNING
46static int verbose = DEFAULT_VERBOSE;
47static int do_show = 0;
48static int dry_run = 0;
49static int ignore_loaded = 0;
50static int lookup_only = 0;
51static int first_time = 0;
52static int ignore_commands = 0;
53static int use_blacklist = 0;
54static int force = 0;
55static int strip_modversion = 0;
56static int strip_vermagic = 0;
57static int remove_dependencies = 0;
58static int quiet_inuse = 0;
59
60static const char cmdopts_s[] = "arRibfDcnC:d:S:sqvVh";
61static const struct option cmdopts[] = {
62	{"all", no_argument, 0, 'a'},
63	{"remove", no_argument, 0, 'r'},
64	{"remove-dependencies", no_argument, 0, 5},
65	{"resolve-alias", no_argument, 0, 'R'},
66	{"first-time", no_argument, 0, 3},
67	{"ignore-install", no_argument, 0, 'i'},
68	{"ignore-remove", no_argument, 0, 'i'},
69	{"use-blacklist", no_argument, 0, 'b'},
70	{"force", no_argument, 0, 'f'},
71	{"force-modversion", no_argument, 0, 2},
72	{"force-vermagic", no_argument, 0, 1},
73
74	{"show-depends", no_argument, 0, 'D'},
75	{"showconfig", no_argument, 0, 'c'},
76	{"show-config", no_argument, 0, 'c'},
77	{"show-modversions", no_argument, 0, 4},
78	{"dump-modversions", no_argument, 0, 4},
79
80	{"dry-run", no_argument, 0, 'n'},
81	{"show", no_argument, 0, 'n'},
82
83	{"config", required_argument, 0, 'C'},
84	{"dirname", required_argument, 0, 'd'},
85	{"set-version", required_argument, 0, 'S'},
86
87	{"syslog", no_argument, 0, 's'},
88	{"quiet", no_argument, 0, 'q'},
89	{"verbose", no_argument, 0, 'v'},
90	{"version", no_argument, 0, 'V'},
91	{"help", no_argument, 0, 'h'},
92	{NULL, 0, 0, 0}
93};
94
95static void help(void)
96{
97	printf("Usage:\n"
98		"\t%s [options] [-i] [-b] modulename\n"
99		"\t%s [options] -a [-i] [-b] modulename [modulename...]\n"
100		"\t%s [options] -r [-i] modulename\n"
101		"\t%s [options] -r -a [-i] modulename [modulename...]\n"
102		"\t%s [options] -c\n"
103		"\t%s [options] --dump-modversions filename\n"
104		"Management Options:\n"
105		"\t-a, --all                   Consider every non-argument to\n"
106		"\t                            be a module name to be inserted\n"
107		"\t                            or removed (-r)\n"
108		"\t-r, --remove                Remove modules instead of inserting\n"
109		"\t    --remove-dependencies   Also remove modules depending on it\n"
110		"\t-R, --resolve-alias         Only lookup and print alias and exit\n"
111		"\t    --first-time            Fail if module already inserted or removed\n"
112		"\t-i, --ignore-install        Ignore install commands\n"
113		"\t-i, --ignore-remove         Ignore remove commands\n"
114		"\t-b, --use-blacklist         Apply blacklist to resolved alias.\n"
115		"\t-f, --force                 Force module insertion or removal.\n"
116		"\t                            implies --force-modversions and\n"
117		"\t                            --force-vermagic\n"
118		"\t    --force-modversion      Ignore module's version\n"
119		"\t    --force-vermagic        Ignore module's version magic\n"
120		"\n"
121		"Query Options:\n"
122		"\t-D, --show-depends          Only print module dependencies and exit\n"
123		"\t-c, --showconfig            Print out known configuration and exit\n"
124		"\t-c, --show-config           Same as --showconfig\n"
125		"\t    --show-modversions      Dump module symbol version and exit\n"
126		"\t    --dump-modversions      Same as --show-modversions\n"
127		"\n"
128		"General Options:\n"
129		"\t-n, --dry-run               Do not execute operations, just print out\n"
130		"\t-n, --show                  Same as --dry-run\n"
131
132		"\t-C, --config=FILE           Use FILE instead of default search paths\n"
133		"\t-d, --dirname=DIR           Use DIR as filesystem root for /lib/modules\n"
134		"\t-S, --set-version=VERSION   Use VERSION instead of `uname -r`\n"
135
136		"\t-s, --syslog                print to syslog, not stderr\n"
137		"\t-q, --quiet                 disable messages\n"
138		"\t-v, --verbose               enables more messages\n"
139		"\t-V, --version               show version\n"
140		"\t-h, --help                  show this help\n",
141		program_invocation_short_name, program_invocation_short_name,
142		program_invocation_short_name, program_invocation_short_name,
143		program_invocation_short_name, program_invocation_short_name);
144}
145
146_printf_format_(1, 2)
147static inline void _show(const char *fmt, ...)
148{
149	va_list args;
150
151	if (!do_show && verbose <= DEFAULT_VERBOSE)
152		return;
153
154	va_start(args, fmt);
155	vfprintf(stdout, fmt, args);
156	fflush(stdout);
157	va_end(args);
158}
159#define SHOW(...) _show(__VA_ARGS__)
160
161static int show_config(struct kmod_ctx *ctx)
162{
163	struct config_iterators {
164		const char *name;
165		struct kmod_config_iter *(*get_iter)(const struct kmod_ctx *ctx);
166	} ci[] = {
167		{ "blacklist", kmod_config_get_blacklists },
168		{ "install", kmod_config_get_install_commands },
169		{ "remove", kmod_config_get_remove_commands },
170		{ "alias", kmod_config_get_aliases },
171		{ "options", kmod_config_get_options },
172		{ "softdep", kmod_config_get_softdeps },
173	};
174	size_t i;
175
176	for (i = 0;  i < ARRAY_SIZE(ci); i++) {
177		struct kmod_config_iter *iter = ci[i].get_iter(ctx);
178
179		if (iter == NULL)
180			continue;
181
182		while (kmod_config_iter_next(iter)) {
183			const char *val;
184
185			printf("%s %s", ci[i].name,
186					kmod_config_iter_get_key(iter));
187			val = kmod_config_iter_get_value(iter);
188			if (val != NULL) {
189				putchar(' ');
190				puts(val);
191			} else
192				putchar('\n');
193		}
194
195		kmod_config_iter_free_iter(iter);
196	}
197
198	puts("\n# End of configuration files. Dumping indexes now:\n");
199	fflush(stdout);
200
201	kmod_dump_index(ctx, KMOD_INDEX_MODULES_ALIAS, STDOUT_FILENO);
202	kmod_dump_index(ctx, KMOD_INDEX_MODULES_SYMBOL, STDOUT_FILENO);
203
204	return 0;
205}
206
207static int show_modversions(struct kmod_ctx *ctx, const char *filename)
208{
209	struct kmod_list *l, *list = NULL;
210	struct kmod_module *mod;
211	int err = kmod_module_new_from_path(ctx, filename, &mod);
212	if (err < 0) {
213		LOG("Module %s not found.\n", filename);
214		return err;
215	}
216
217	err = kmod_module_get_versions(mod, &list);
218	if (err < 0) {
219		LOG("could not get modversions of %s: %s\n",
220			filename, strerror(-err));
221		kmod_module_unref(mod);
222		return err;
223	}
224
225	kmod_list_foreach(l, list) {
226		const char *symbol = kmod_module_version_get_symbol(l);
227		uint64_t crc = kmod_module_version_get_crc(l);
228		printf("0x%08"PRIx64"\t%s\n", crc, symbol);
229	}
230	kmod_module_versions_free_list(list);
231	kmod_module_unref(mod);
232	return 0;
233}
234
235static int command_do(struct kmod_module *module, const char *type,
236				const char *command, const char *cmdline_opts)
237{
238	const char *modname = kmod_module_get_name(module);
239	char *p, *cmd = NULL;
240	size_t cmdlen, cmdline_opts_len, varlen;
241	int ret = 0;
242
243	if (cmdline_opts == NULL)
244		cmdline_opts = "";
245	cmdline_opts_len = strlen(cmdline_opts);
246
247	cmd = strdup(command);
248	if (cmd == NULL)
249		return -ENOMEM;
250	cmdlen = strlen(cmd);
251	varlen = sizeof("$CMDLINE_OPTS") - 1;
252	while ((p = strstr(cmd, "$CMDLINE_OPTS")) != NULL) {
253		size_t prefixlen = p - cmd;
254		size_t suffixlen = cmdlen - prefixlen - varlen;
255		size_t slen = cmdlen - varlen + cmdline_opts_len;
256		char *suffix = p + varlen;
257		char *s = malloc(slen + 1);
258		if (s == NULL) {
259			free(cmd);
260			return -ENOMEM;
261		}
262		memcpy(s, cmd, p - cmd);
263		memcpy(s + prefixlen, cmdline_opts, cmdline_opts_len);
264		memcpy(s + prefixlen + cmdline_opts_len, suffix, suffixlen);
265		s[slen] = '\0';
266
267		free(cmd);
268		cmd = s;
269		cmdlen = slen;
270	}
271
272	SHOW("%s %s\n", type, cmd);
273	if (dry_run)
274		goto end;
275
276	setenv("MODPROBE_MODULE", modname, 1);
277	ret = system(cmd);
278	unsetenv("MODPROBE_MODULE");
279	if (ret == -1 || WEXITSTATUS(ret)) {
280		LOG("Error running %s command for %s\n", type, modname);
281		if (ret != -1)
282			ret = -WEXITSTATUS(ret);
283	}
284
285end:
286	free(cmd);
287	return ret;
288}
289
290static int rmmod_do_remove_module(struct kmod_module *mod)
291{
292	const char *modname = kmod_module_get_name(mod);
293	struct kmod_list *deps, *itr;
294	int flags = 0, err;
295
296	SHOW("rmmod %s\n", kmod_module_get_name(mod));
297
298	if (dry_run)
299		return 0;
300
301	if (force)
302		flags |= KMOD_REMOVE_FORCE;
303
304	err = kmod_module_remove_module(mod, flags);
305	if (err == -EEXIST) {
306		if (!first_time)
307			err = 0;
308		else
309			LOG("Module %s is not in kernel.\n", modname);
310	}
311
312	deps = kmod_module_get_dependencies(mod);
313	if (deps != NULL) {
314		kmod_list_foreach(itr, deps) {
315			struct kmod_module *dep = kmod_module_get_module(itr);
316			if (kmod_module_get_refcnt(dep) == 0)
317				rmmod_do_remove_module(dep);
318			kmod_module_unref(dep);
319		}
320		kmod_module_unref_list(deps);
321	}
322
323	return err;
324}
325
326static int rmmod_do_module(struct kmod_module *mod, bool do_dependencies);
327
328static int rmmod_do_deps_list(struct kmod_list *list, bool stop_on_errors)
329{
330	struct kmod_list *l;
331
332	kmod_list_foreach_reverse(l, list) {
333		struct kmod_module *m = kmod_module_get_module(l);
334		int r = rmmod_do_module(m, false);
335		kmod_module_unref(m);
336
337		if (r < 0 && stop_on_errors)
338			return r;
339	}
340
341	return 0;
342}
343
344static int rmmod_do_module(struct kmod_module *mod, bool do_dependencies)
345{
346	const char *modname = kmod_module_get_name(mod);
347	struct kmod_list *pre = NULL, *post = NULL;
348	const char *cmd = NULL;
349	int err;
350
351	if (!ignore_commands) {
352		err = kmod_module_get_softdeps(mod, &pre, &post);
353		if (err < 0) {
354			WRN("could not get softdeps of '%s': %s\n",
355						modname, strerror(-err));
356			return err;
357		}
358
359		cmd = kmod_module_get_remove_commands(mod);
360	}
361
362	if (cmd == NULL && !ignore_loaded) {
363		int state = kmod_module_get_initstate(mod);
364
365		if (state < 0) {
366			if (first_time) {
367				LOG("Module %s is not in kernel.\n", modname);
368				err = -ENOENT;
369			} else {
370				err = 0;
371			}
372			goto error;
373		} else if (state == KMOD_MODULE_BUILTIN) {
374			LOG("Module %s is builtin.\n", modname);
375			err = -ENOENT;
376			goto error;
377		}
378	}
379
380	rmmod_do_deps_list(post, false);
381
382	if (do_dependencies && remove_dependencies) {
383		struct kmod_list *deps = kmod_module_get_dependencies(mod);
384
385		err = rmmod_do_deps_list(deps, true);
386		if (err < 0)
387			goto error;
388	}
389
390	if (!ignore_loaded && !cmd) {
391		int usage = kmod_module_get_refcnt(mod);
392
393		if (usage > 0) {
394			if (!quiet_inuse)
395				LOG("Module %s is in use.\n", modname);
396
397			err = -EBUSY;
398			goto error;
399		}
400	}
401
402	if (cmd == NULL)
403		err = rmmod_do_remove_module(mod);
404	else
405		err = command_do(mod, "remove", cmd, NULL);
406
407	if (err < 0)
408		goto error;
409
410	rmmod_do_deps_list(pre, false);
411
412error:
413	kmod_module_unref_list(pre);
414	kmod_module_unref_list(post);
415
416	return err;
417}
418
419static int rmmod(struct kmod_ctx *ctx, const char *alias)
420{
421	struct kmod_list *l, *list = NULL;
422	int err;
423
424	err = kmod_module_new_from_lookup(ctx, alias, &list);
425	if (err < 0)
426		return err;
427
428	if (list == NULL) {
429		LOG("Module %s not found.\n", alias);
430		err = -ENOENT;
431	}
432
433	kmod_list_foreach(l, list) {
434		struct kmod_module *mod = kmod_module_get_module(l);
435		err = rmmod_do_module(mod, true);
436		kmod_module_unref(mod);
437		if (err < 0)
438			break;
439	}
440
441	kmod_module_unref_list(list);
442	return err;
443}
444
445static int rmmod_all(struct kmod_ctx *ctx, char **args, int nargs)
446{
447	int i, err = 0;
448
449	for (i = 0; i < nargs; i++) {
450		int r = rmmod(ctx, args[i]);
451		if (r < 0)
452			err = r;
453	}
454
455	return err;
456}
457
458static void print_action(struct kmod_module *m, bool install,
459							const char *options)
460{
461	const char *path;
462
463	if (install) {
464		printf("install %s %s\n", kmod_module_get_install_commands(m),
465								options);
466		return;
467	}
468
469	path = kmod_module_get_path(m);
470
471	if (path == NULL) {
472		/*
473		 * Either a builtin module, or an alias, print only for
474		 * builtin
475		 */
476		if (kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN)
477			printf("builtin %s\n", kmod_module_get_name(m));
478	} else
479		printf("insmod %s %s\n", kmod_module_get_path(m), options);
480}
481
482static int insmod(struct kmod_ctx *ctx, const char *alias,
483						const char *extra_options)
484{
485	struct kmod_list *l, *list = NULL;
486	int err, flags = 0;
487
488	void (*show)(struct kmod_module *m, bool install,
489						const char *options) = NULL;
490
491	err = kmod_module_new_from_lookup(ctx, alias, &list);
492
493	if (list == NULL || err < 0) {
494		LOG("Module %s not found in directory %s\n", alias,
495			ctx ? kmod_get_dirname(ctx) : "(missing)");
496		return -ENOENT;
497	}
498
499	if (strip_modversion || force)
500		flags |= KMOD_PROBE_FORCE_MODVERSION;
501	if (strip_vermagic || force)
502		flags |= KMOD_PROBE_FORCE_VERMAGIC;
503	if (ignore_commands)
504		flags |= KMOD_PROBE_IGNORE_COMMAND;
505	if (ignore_loaded)
506		flags |= KMOD_PROBE_IGNORE_LOADED;
507	if (dry_run)
508		flags |= KMOD_PROBE_DRY_RUN;
509	if (do_show || verbose > DEFAULT_VERBOSE)
510		show = &print_action;
511
512	flags |= KMOD_PROBE_APPLY_BLACKLIST_ALIAS_ONLY;
513
514	if (use_blacklist)
515		flags |= KMOD_PROBE_APPLY_BLACKLIST;
516	if (first_time)
517		flags |= KMOD_PROBE_FAIL_ON_LOADED;
518
519	kmod_list_foreach(l, list) {
520		struct kmod_module *mod = kmod_module_get_module(l);
521
522		if (lookup_only)
523			printf("%s\n", kmod_module_get_name(mod));
524		else {
525			err = kmod_module_probe_insert_module(mod, flags,
526					extra_options, NULL, NULL, show);
527		}
528
529		if (err >= 0)
530			/* ignore flag return values such as a mod being blacklisted */
531			err = 0;
532		else {
533			switch (err) {
534			case -EEXIST:
535				ERR("could not insert '%s': Module already in kernel\n",
536							kmod_module_get_name(mod));
537				break;
538			case -ENOENT:
539				ERR("could not insert '%s': Unknown symbol in module, "
540						"or unknown parameter (see dmesg)\n",
541						kmod_module_get_name(mod));
542				break;
543			default:
544				ERR("could not insert '%s': %s\n",
545						kmod_module_get_name(mod),
546						strerror(-err));
547				break;
548			}
549		}
550
551		kmod_module_unref(mod);
552	}
553
554	kmod_module_unref_list(list);
555	return err;
556}
557
558static int insmod_all(struct kmod_ctx *ctx, char **args, int nargs)
559{
560	int i, err = 0;
561
562	for (i = 0; i < nargs; i++) {
563		int r = insmod(ctx, args[i], NULL);
564		if (r < 0)
565			err = r;
566	}
567
568	return err;
569}
570
571static void env_modprobe_options_append(const char *value)
572{
573	const char *old = getenv("MODPROBE_OPTIONS");
574	char *env;
575
576	if (old == NULL) {
577		setenv("MODPROBE_OPTIONS", value, 1);
578		return;
579	}
580
581	if (asprintf(&env, "%s %s", old, value) < 0) {
582		ERR("could not append value to $MODPROBE_OPTIONS\n");
583		return;
584	}
585
586	if (setenv("MODPROBE_OPTIONS", env, 1) < 0)
587		ERR("could not setenv(MODPROBE_OPTIONS, \"%s\")\n", env);
588	free(env);
589}
590
591static int options_from_array(char **args, int nargs, char **output)
592{
593	char *opts = NULL;
594	size_t optslen = 0;
595	int i, err = 0;
596
597	for (i = 1; i < nargs; i++) {
598		size_t len = strlen(args[i]);
599		size_t qlen = 0;
600		const char *value;
601		void *tmp;
602
603		value = strchr(args[i], '=');
604		if (value) {
605			value++;
606			if (*value != '"' && *value != '\'') {
607				if (strchr(value, ' '))
608					qlen = 2;
609			}
610		}
611
612		tmp = realloc(opts, optslen + len + qlen + 2);
613		if (!tmp) {
614			err = -errno;
615			free(opts);
616			opts = NULL;
617			ERR("could not gather module options: out-of-memory\n");
618			break;
619		}
620		opts = tmp;
621		if (optslen > 0) {
622			opts[optslen] = ' ';
623			optslen++;
624		}
625		if (qlen == 0) {
626			memcpy(opts + optslen, args[i], len + 1);
627			optslen += len;
628		} else {
629			size_t keylen = value - args[i];
630			size_t valuelen = len - keylen;
631			memcpy(opts + optslen, args[i], keylen);
632			optslen += keylen;
633			opts[optslen] = '"';
634			optslen++;
635			memcpy(opts + optslen, value, valuelen);
636			optslen += valuelen;
637			opts[optslen] = '"';
638			optslen++;
639			opts[optslen] = '\0';
640		}
641	}
642
643	*output = opts;
644	return err;
645}
646
647static char **prepend_options_from_env(int *p_argc, char **orig_argv)
648{
649	const char *p, *env = getenv("MODPROBE_OPTIONS");
650	char **new_argv, *str_start, *str_end, *str, *s, *quote;
651	int i, argc = *p_argc;
652	size_t envlen, space_count = 0;
653
654	if (env == NULL)
655		return orig_argv;
656
657	for (p = env; *p != '\0'; p++) {
658		if (*p == ' ')
659			space_count++;
660	}
661
662	envlen = p - env;
663	new_argv = malloc(sizeof(char *) * (argc + space_count + 3 + envlen));
664	if (new_argv == NULL)
665		return NULL;
666
667	new_argv[0] = orig_argv[0];
668	str_start = str = (char *) (new_argv + argc + space_count + 3);
669	memcpy(str, env, envlen + 1);
670
671	str_end = str_start + envlen;
672
673	quote = NULL;
674	for (i = 1, s = str; *s != '\0'; s++) {
675		if (quote == NULL) {
676			if (*s == ' ') {
677				new_argv[i] = str;
678				i++;
679				*s = '\0';
680				str = s + 1;
681			} else if (*s == '"' || *s == '\'')
682				quote = s;
683		} else {
684			if (*s == *quote) {
685				if (quote == str) {
686					new_argv[i] = str + 1;
687					i++;
688					*s = '\0';
689					str = s + 1;
690				} else {
691					char *it;
692					for (it = quote; it < s - 1; it++)
693						it[0] = it[1];
694					for (it = s - 1; it < str_end - 2; it++)
695						it[0] = it[2];
696					str_end -= 2;
697					*str_end = '\0';
698					s -= 2;
699				}
700				quote = NULL;
701			}
702		}
703	}
704	if (str < s) {
705		new_argv[i] = str;
706		i++;
707	}
708
709	memcpy(new_argv + i, orig_argv + 1, sizeof(char *) * (argc - 1));
710	new_argv[i + argc] = NULL;
711	*p_argc = i + argc - 1;
712
713	return new_argv;
714}
715
716static int do_modprobe(int argc, char **orig_argv)
717{
718	struct kmod_ctx *ctx;
719	char **args = NULL, **argv;
720	const char **config_paths = NULL;
721	int nargs = 0, n_config_paths = 0;
722	char dirname_buf[PATH_MAX];
723	const char *dirname = NULL;
724	const char *root = NULL;
725	const char *kversion = NULL;
726	int use_all = 0;
727	int do_remove = 0;
728	int do_show_config = 0;
729	int do_show_modversions = 0;
730	int err;
731
732	argv = prepend_options_from_env(&argc, orig_argv);
733	if (argv == NULL) {
734		ERR("Could not prepend options from command line\n");
735		return EXIT_FAILURE;
736	}
737
738	for (;;) {
739		int c, idx = 0;
740		c = getopt_long(argc, argv, cmdopts_s, cmdopts, &idx);
741		if (c == -1)
742			break;
743		switch (c) {
744		case 'a':
745			log_priority = LOG_WARNING;
746			use_all = 1;
747			break;
748		case 'r':
749			do_remove = 1;
750			break;
751		case 5:
752			remove_dependencies = 1;
753			break;
754		case 'R':
755			lookup_only = 1;
756			break;
757		case 3:
758			first_time = 1;
759			break;
760		case 'i':
761			ignore_commands = 1;
762			break;
763		case 'b':
764			use_blacklist = 1;
765			break;
766		case 'f':
767			force = 1;
768			break;
769		case 2:
770			strip_modversion = 1;
771			break;
772		case 1:
773			strip_vermagic = 1;
774			break;
775		case 'D':
776			ignore_loaded = 1;
777			dry_run = 1;
778			do_show = 1;
779			break;
780		case 'c':
781			do_show_config = 1;
782			break;
783		case 4:
784			do_show_modversions = 1;
785			break;
786		case 'n':
787			dry_run = 1;
788			break;
789		case 'C': {
790			size_t bytes = sizeof(char *) * (n_config_paths + 2);
791			void *tmp = realloc(config_paths, bytes);
792			if (!tmp) {
793				ERR("out-of-memory\n");
794				err = -1;
795				goto done;
796			}
797			config_paths = tmp;
798			config_paths[n_config_paths] = optarg;
799			n_config_paths++;
800			config_paths[n_config_paths] = NULL;
801
802			env_modprobe_options_append("-C");
803			env_modprobe_options_append(optarg);
804			break;
805		}
806		case 'd':
807			root = optarg;
808			break;
809		case 'S':
810			kversion = optarg;
811			break;
812		case 's':
813			env_modprobe_options_append("-s");
814			use_syslog = 1;
815			break;
816		case 'q':
817			env_modprobe_options_append("-q");
818			verbose = LOG_EMERG;
819			break;
820		case 'v':
821			env_modprobe_options_append("-v");
822			verbose++;
823			break;
824		case 'V':
825			puts(PACKAGE " version " VERSION);
826			puts(KMOD_FEATURES);
827			err = 0;
828			goto done;
829		case 'h':
830			help();
831			err = 0;
832			goto done;
833		case '?':
834			err = -1;
835			goto done;
836		default:
837			ERR("unexpected getopt_long() value '%c'.\n", c);
838			err = -1;
839			goto done;
840		}
841	}
842
843	args = argv + optind;
844	nargs = argc - optind;
845
846	log_open(use_syslog);
847
848	if (!do_show_config) {
849		if (nargs == 0) {
850			ERR("missing parameters. See -h.\n");
851			err = -1;
852			goto done;
853		}
854	}
855
856	if (root != NULL || kversion != NULL) {
857		struct utsname u;
858		if (root == NULL)
859			root = "";
860		if (kversion == NULL) {
861			if (uname(&u) < 0) {
862				ERR("uname() failed: %m\n");
863				err = -1;
864				goto done;
865			}
866			kversion = u.release;
867		}
868		snprintf(dirname_buf, sizeof(dirname_buf),
869				"%s/lib/modules/%s", root,
870				kversion);
871		dirname = dirname_buf;
872	}
873
874	ctx = kmod_new(dirname, config_paths);
875	if (!ctx) {
876		ERR("kmod_new() failed!\n");
877		err = -1;
878		goto done;
879	}
880
881	log_setup_kmod_log(ctx, verbose);
882
883	kmod_load_resources(ctx);
884
885	if (do_show_config)
886		err = show_config(ctx);
887	else if (do_show_modversions)
888		err = show_modversions(ctx, args[0]);
889	else if (do_remove)
890		err = rmmod_all(ctx, args, nargs);
891	else if (use_all)
892		err = insmod_all(ctx, args, nargs);
893	else {
894		char *opts;
895		err = options_from_array(args, nargs, &opts);
896		if (err == 0) {
897			err = insmod(ctx, args[0], opts);
898			free(opts);
899		}
900	}
901
902	kmod_unref(ctx);
903
904done:
905	log_close();
906
907	if (argv != orig_argv)
908		free(argv);
909
910	free(config_paths);
911
912	return err >= 0 ? EXIT_SUCCESS : EXIT_FAILURE;
913}
914
915const struct kmod_cmd kmod_cmd_compat_modprobe = {
916	.name = "modprobe",
917	.cmd = do_modprobe,
918	.help = "compat modprobe command",
919};
920