[thirdparty/systemd.git] / src / sysctl / sysctl.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <errno.h>
#include <getopt.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>

#include "conf-files.h"
#include "creds-util.h"
#include "def.h"
#include "errno-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "glob-util.h"
#include "hashmap.h"
#include "log.h"
#include "main-func.h"
#include "pager.h"
#include "path-util.h"
#include "pretty-print.h"
#include "string-util.h"
#include "strv.h"
#include "sysctl-util.h"

static char **arg_prefixes = NULL;
static bool arg_cat_config = false;
static bool arg_strict = false;
static PagerFlags arg_pager_flags = 0;

STATIC_DESTRUCTOR_REGISTER(arg_prefixes, strv_freep);

typedef struct Option {
        char *key;
        char *value;
        bool ignore_failure;
} Option;

static Option *option_free(Option *o) {
        if (!o)
                return NULL;

        free(o->key);
        free(o->value);

        return mfree(o);
}

DEFINE_TRIVIAL_CLEANUP_FUNC(Option*, option_free);
DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(option_hash_ops, char, string_hash_func, string_compare_func, Option, option_free);

static bool test_prefix(const char *p) {
        if (strv_isempty(arg_prefixes))
                return true;

        return path_startswith_strv(p, arg_prefixes);
}

static Option *option_new(
                const char *key,
                const char *value,
                bool ignore_failure) {

        _cleanup_(option_freep) Option *o = NULL;

        assert(key);

        o = new(Option, 1);
        if (!o)
                return NULL;

        *o = (Option) {
                .key = strdup(key),
                .value = value ? strdup(value) : NULL,
                .ignore_failure = ignore_failure,
        };

        if (!o->key)
                return NULL;
        if (value && !o->value)
                return NULL;

        return TAKE_PTR(o);
}

static int sysctl_write_or_warn(const char *key, const char *value, bool ignore_failure) {
        int r;

        r = sysctl_write(key, value);
        if (r < 0) {
                /* Proceed without failing if ignore_failure is true.
                 * If the sysctl is not available in the kernel or we are running with reduced privileges and
                 * cannot write it, then log about the issue, and proceed without failing. Unless strict mode
                 * (arg_strict = true) is enabled, in which case we should fail. (EROFS is treated as a
                 * permission problem here, since that's how container managers usually protected their
                 * sysctls.)
                 * In all other cases log an error and make the tool fail. */
                if (ignore_failure || (!arg_strict && (r == -EROFS || ERRNO_IS_PRIVILEGE(r))))
                        log_debug_errno(r, "Couldn't write '%s' to '%s', ignoring: %m", value, key);
                else if (!arg_strict && r == -ENOENT)
                        log_warning_errno(r, "Couldn't write '%s' to '%s', ignoring: %m", value, key);
                else
                        return log_error_errno(r, "Couldn't write '%s' to '%s': %m", value, key);
        }

        return 0;
}

static int apply_glob_option(OrderedHashmap *sysctl_options, Option *option) {
        _cleanup_strv_free_ char **paths = NULL;
        _cleanup_free_ char *pattern = NULL;
        int r, k;

        assert(sysctl_options);
        assert(option);

        pattern = path_join("/proc/sys", option->key);
        if (!pattern)
                return log_oom();

        r = glob_extend(&paths, pattern, GLOB_NOCHECK);
        if (r < 0) {
                if (r == -ENOENT) {
                        log_debug("No match for glob: %s", option->key);
                        return 0;
                }
                if (option->ignore_failure || ERRNO_IS_PRIVILEGE(r)) {
                        log_debug_errno(r, "Failed to resolve glob '%s', ignoring: %m", option->key);
                        return 0;
                } else
                        return log_error_errno(r, "Couldn't resolve glob '%s': %m", option->key);
        }

        STRV_FOREACH(s, paths) {
                const char *key;

                assert_se(key = path_startswith(*s, "/proc/sys"));

                if (!test_prefix(key))
                        continue;

                if (ordered_hashmap_contains(sysctl_options, key)) {
                        log_debug("Not setting %s (explicit setting exists).", key);
                        continue;
                }

                k = sysctl_write_or_warn(key, option->value, option->ignore_failure);
                if (k < 0 && r >= 0)
                        r = k;
        }

        return r;
}

static int apply_all(OrderedHashmap *sysctl_options) {
        Option *option;
        int r = 0;

        ORDERED_HASHMAP_FOREACH(option, sysctl_options) {
                int k;

                /* Ignore "negative match" options, they are there only to exclude stuff from globs. */
                if (!option->value)
                        continue;

                if (string_is_glob(option->key))
                        k = apply_glob_option(sysctl_options, option);
                else
                        k = sysctl_write_or_warn(option->key, option->value, option->ignore_failure);
                if (k < 0 && r >= 0)
                        r = k;
        }

        return r;
}

static int parse_file(OrderedHashmap **sysctl_options, const char *path, bool ignore_enoent) {
        _cleanup_fclose_ FILE *f = NULL;
        _cleanup_free_ char *pp = NULL;
        unsigned c = 0;
        int r;

        assert(path);

        r = search_and_fopen(path, "re", NULL, (const char**) CONF_PATHS_STRV("sysctl.d"), &f, &pp);
        if (r < 0) {
                if (ignore_enoent && r == -ENOENT)
                        return 0;

                return log_error_errno(r, "Failed to open file '%s', ignoring: %m", path);
        }

        log_debug("Parsing %s", pp);
        for (;;) {
                _cleanup_(option_freep) Option *new_option = NULL;
                _cleanup_free_ char *l = NULL;
                bool ignore_failure = false;
                Option *existing;
                char *p, *value;
                int k;

                k = read_line(f, LONG_LINE_MAX, &l);
                if (k == 0)
                        break;
                if (k < 0)
                        return log_error_errno(k, "Failed to read file '%s', ignoring: %m", pp);

                c++;

                p = strstrip(l);

                if (isempty(p))
                        continue;
                if (strchr(COMMENTS "\n", *p))
                        continue;

                value = strchr(p, '=');
                if (value) {
                        if (p[0] == '-') {
                                ignore_failure = true;
                                p++;
                        }

                        *value = 0;
                        value++;
                        value = strstrip(value);

                } else {
                        if (p[0] == '-')
                                /* We have a "negative match" option. Let's continue with value==NULL. */
                                p++;
                        else {
                                log_syntax(NULL, LOG_WARNING, pp, c, 0,
                                           "Line is not an assignment, ignoring: %s", p);
                                if (r == 0)
                                        r = -EINVAL;
                                continue;
                        }
                }

                p = strstrip(p);
                p = sysctl_normalize(p);

                /* We can't filter out globs at this point, we'll need to do that later. */
                if (!string_is_glob(p) &&
                    !test_prefix(p))
                        continue;

                existing = ordered_hashmap_get(*sysctl_options, p);
                if (existing) {
                        if (streq_ptr(value, existing->value)) {
                                existing->ignore_failure = existing->ignore_failure || ignore_failure;
                                continue;
                        }

                        log_debug("Overwriting earlier assignment of %s at '%s:%u'.", p, pp, c);
                        option_free(ordered_hashmap_remove(*sysctl_options, p));
                }

                new_option = option_new(p, value, ignore_failure);
                if (!new_option)
                        return log_oom();

                k = ordered_hashmap_ensure_put(sysctl_options, &option_hash_ops, new_option->key, new_option);
                if (k < 0)
                        return log_error_errno(k, "Failed to add sysctl variable %s to hashmap: %m", p);

                TAKE_PTR(new_option);
        }

        return r;
}

static int read_credential_lines(OrderedHashmap **sysctl_options) {
        _cleanup_free_ char *j = NULL;
        const char *d;
        int r;

        r = get_credentials_dir(&d);
        if (r == -ENXIO)
                return 0;
        if (r < 0)
                return log_error_errno(r, "Failed to get credentials directory: %m");

        j = path_join(d, "sysctl.extra");
        if (!j)
                return log_oom();

        (void) parse_file(sysctl_options, j, /* ignore_enoent= */ true);
        return 0;
}

static int help(void) {
        _cleanup_free_ char *link = NULL;
        int r;

        r = terminal_urlify_man("systemd-sysctl.service", "8", &link);
        if (r < 0)
                return log_oom();

        printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
               "Applies kernel sysctl settings.\n\n"
               "  -h --help             Show this help\n"
               "     --version          Show package version\n"
               "     --cat-config       Show configuration files\n"
               "     --prefix=PATH      Only apply rules with the specified prefix\n"
               "     --no-pager         Do not pipe output into a pager\n"
               "\nSee the %s for details.\n",
               program_invocation_short_name,
               link);

        return 0;
}

static int parse_argv(int argc, char *argv[]) {

        enum {
                ARG_VERSION = 0x100,
                ARG_CAT_CONFIG,
                ARG_PREFIX,
                ARG_NO_PAGER,
                ARG_STRICT,
        };

        static const struct option options[] = {
                { "help",       no_argument,       NULL, 'h'            },
                { "version",    no_argument,       NULL, ARG_VERSION    },
                { "cat-config", no_argument,       NULL, ARG_CAT_CONFIG },
                { "prefix",     required_argument, NULL, ARG_PREFIX     },
                { "no-pager",   no_argument,       NULL, ARG_NO_PAGER   },
                { "strict",     no_argument,       NULL, ARG_STRICT     },
                {}
        };

        int c;

        assert(argc >= 0);
        assert(argv);

        while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)

                switch (c) {

                case 'h':
                        return help();

                case ARG_VERSION:
                        return version();

                case ARG_CAT_CONFIG:
                        arg_cat_config = true;
                        break;

                case ARG_PREFIX: {
                        const char *s;
                        char *p;

                        /* We used to require people to specify absolute paths
                         * in /proc/sys in the past. This is kinda useless, but
                         * we need to keep compatibility. We now support any
                         * sysctl name available. */
                        sysctl_normalize(optarg);

                        s = path_startswith(optarg, "/proc/sys");
                        p = strdup(s ?: optarg);
                        if (!p)
                                return log_oom();

                        if (strv_consume(&arg_prefixes, p) < 0)
                                return log_oom();

                        break;
                }

                case ARG_NO_PAGER:
                        arg_pager_flags |= PAGER_DISABLE;
                        break;

                case ARG_STRICT:
                        arg_strict = true;
                        break;

                case '?':
                        return -EINVAL;

                default:
                        assert_not_reached();
                }

        if (arg_cat_config && argc > optind)
                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
                                       "Positional arguments are not allowed with --cat-config");

        return 1;
}

static int run(int argc, char *argv[]) {
        _cleanup_(ordered_hashmap_freep) OrderedHashmap *sysctl_options = NULL;
        int r, k;

        r = parse_argv(argc, argv);
        if (r <= 0)
                return r;

        log_setup();

        umask(0022);

        if (argc > optind) {
                int i;

                r = 0;

                for (i = optind; i < argc; i++) {
                        k = parse_file(&sysctl_options, argv[i], false);
                        if (k < 0 && r == 0)
                                r = k;
                }
        } else {
                _cleanup_strv_free_ char **files = NULL;

                r = conf_files_list_strv(&files, ".conf", NULL, 0, (const char**) CONF_PATHS_STRV("sysctl.d"));
                if (r < 0)
                        return log_error_errno(r, "Failed to enumerate sysctl.d files: %m");

                if (arg_cat_config) {
                        pager_open(arg_pager_flags);

                        return cat_files(NULL, files, 0);
                }

                STRV_FOREACH(f, files) {
                        k = parse_file(&sysctl_options, *f, true);
                        if (k < 0 && r == 0)
                                r = k;
                }

                k = read_credential_lines(&sysctl_options);
                if (k < 0 && r == 0)
                        r = k;
        }

        k = apply_all(sysctl_options);
        if (k < 0 && r == 0)
                r = k;

        return r;
}

DEFINE_MAIN_FUNCTION(run);
Commit	Line	Data
db9ecf05	1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
8e1bd70d	2
8e1bd70d	3	#include <errno.h>
7a2a0b90	4	#include <getopt.h>
3f6fd1ba LP	5	#include <limits.h>
	6	#include <stdbool.h>
	7	#include <stdio.h>
	8	#include <stdlib.h>
ca78ad1d ZJS	9	#include <sys/stat.h>
ca78ad1d ZJS	10	#include <sys/types.h>
8e1bd70d	11
2c21044f	12	#include "conf-files.h"
39f0d1d2	13	#include "creds-util.h"
a0f29c76	14	#include "def.h"
32458cc9	15	#include "errno-util.h"
3ffd4af2	16	#include "fd-util.h"
a5c32cff	17	#include "fileio.h"
e0f42479	18	#include "glob-util.h"
3f6fd1ba LP	19	#include "hashmap.h"
3f6fd1ba LP	20	#include "log.h"
8eb42d90	21	#include "main-func.h"
dcd5c891	22	#include "pager.h"
3f6fd1ba	23	#include "path-util.h"
294bf0c3	24	#include "pretty-print.h"
07630cea	25	#include "string-util.h"
3f6fd1ba	26	#include "strv.h"
88a60da0	27	#include "sysctl-util.h"
8e1bd70d	28
fabe5c0e	29	static char **arg_prefixes = NULL;
3c51c626	30	static bool arg_cat_config = false;
e88748c1	31	static bool arg_strict = false;
0221d68a	32	static PagerFlags arg_pager_flags = 0;
8e1bd70d	33
fd8bdbc7 LP	34	STATIC_DESTRUCTOR_REGISTER(arg_prefixes, strv_freep);
fd8bdbc7 LP	35
dec02d6e LP	36	typedef struct Option {
	37	char *key;
	38	char *value;
	39	bool ignore_failure;
	40	} Option;
	41
	42	static Option option_free(Option o) {
	43	if (!o)
	44	return NULL;
	45
	46	free(o->key);
	47	free(o->value);
	48
	49	return mfree(o);
	50	}
	51
	52	DEFINE_TRIVIAL_CLEANUP_FUNC(Option*, option_free);
	53	DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(option_hash_ops, char, string_hash_func, string_compare_func, Option, option_free);
	54
e0f42479	55	static bool test_prefix(const char *p) {
e0f42479 ZJS	56	if (strv_isempty(arg_prefixes))
	57	return true;
	58
c01404fd	59	return path_startswith_strv(p, arg_prefixes);
e0f42479 ZJS	60	}
e0f42479 ZJS	61
dec02d6e LP	62	static Option *option_new(
	63	const char *key,
	64	const char *value,
	65	bool ignore_failure) {
	66
	67	_cleanup_(option_freep) Option *o = NULL;
	68
	69	assert(key);
dec02d6e LP	70
	71	o = new(Option, 1);
	72	if (!o)
	73	return NULL;
	74
	75	*o = (Option) {
	76	.key = strdup(key),
e0f42479	77	.value = value ? strdup(value) : NULL,
dec02d6e LP	78	.ignore_failure = ignore_failure,
	79	};
	80
e0f42479 ZJS	81	if (!o->key)
	82	return NULL;
	83	if (value && !o->value)
dec02d6e LP	84	return NULL;
	85
	86	return TAKE_PTR(o);
	87	}
	88
e0f42479 ZJS	89	static int sysctl_write_or_warn(const char key, const char value, bool ignore_failure) {
	90	int r;
	91
	92	r = sysctl_write(key, value);
	93	if (r < 0) {
e88748c1 QD	94	/* Proceed without failing if ignore_failure is true.
	95	* If the sysctl is not available in the kernel or we are running with reduced privileges and
	96	* cannot write it, then log about the issue, and proceed without failing. Unless strict mode
	97	* (arg_strict = true) is enabled, in which case we should fail. (EROFS is treated as a
	98	* permission problem here, since that's how container managers usually protected their
	99	* sysctls.)
	100	* In all other cases log an error and make the tool fail. */
	101	if (ignore_failure \|\| (!arg_strict && (r == -EROFS \|\| ERRNO_IS_PRIVILEGE(r))))
e0f42479	102	log_debug_errno(r, "Couldn't write '%s' to '%s', ignoring: %m", value, key);
e88748c1	103	else if (!arg_strict && r == -ENOENT)
1805fbcf	104	log_warning_errno(r, "Couldn't write '%s' to '%s', ignoring: %m", value, key);
e0f42479 ZJS	105	else
	106	return log_error_errno(r, "Couldn't write '%s' to '%s': %m", value, key);
	107	}
	108
	109	return 0;
	110	}
	111
7177ac45 YW	112	static int apply_glob_option(OrderedHashmap sysctl_options, Option option) {
	113	_cleanup_strv_free_ char **paths = NULL;
	114	_cleanup_free_ char *pattern = NULL;
	115	int r, k;
fabe5c0e	116
7177ac45 YW	117	assert(sysctl_options);
7177ac45 YW	118	assert(option);
86fc77c4	119
7177ac45 YW	120	pattern = path_join("/proc/sys", option->key);
	121	if (!pattern)
	122	return log_oom();
e50b33be	123
7177ac45 YW	124	r = glob_extend(&paths, pattern, GLOB_NOCHECK);
	125	if (r < 0) {
	126	if (r == -ENOENT) {
	127	log_debug("No match for glob: %s", option->key);
	128	return 0;
	129	}
	130	if (option->ignore_failure \|\| ERRNO_IS_PRIVILEGE(r)) {
	131	log_debug_errno(r, "Failed to resolve glob '%s', ignoring: %m", option->key);
	132	return 0;
	133	} else
	134	return log_error_errno(r, "Couldn't resolve glob '%s': %m", option->key);
	135	}
	136
	137	STRV_FOREACH(s, paths) {
	138	const char *key;
86fc77c4	139
7177ac45	140	assert_se(key = path_startswith(*s, "/proc/sys"));
9c37b41c	141
7177ac45 YW	142	if (!test_prefix(key))
7177ac45 YW	143	continue;
9c37b41c	144
7177ac45 YW	145	if (ordered_hashmap_contains(sysctl_options, key)) {
	146	log_debug("Not setting %s (explicit setting exists).", key);
	147	continue;
	148	}
9c37b41c	149
7177ac45 YW	150	k = sysctl_write_or_warn(key, option->value, option->ignore_failure);
	151	if (k < 0 && r >= 0)
	152	r = k;
	153	}
e0f42479	154
7177ac45 YW	155	return r;
7177ac45 YW	156	}
e0f42479	157
7177ac45 YW	158	static int apply_all(OrderedHashmap *sysctl_options) {
	159	Option *option;
	160	int r = 0;
e0f42479	161
7177ac45 YW	162	ORDERED_HASHMAP_FOREACH(option, sysctl_options) {
7177ac45 YW	163	int k;
e0f42479	164
7177ac45 YW	165	/* Ignore "negative match" options, they are there only to exclude stuff from globs. */
	166	if (!option->value)
	167	continue;
e0f42479	168
7177ac45 YW	169	if (string_is_glob(option->key))
	170	k = apply_glob_option(sysctl_options, option);
	171	else
e0f42479	172	k = sysctl_write_or_warn(option->key, option->value, option->ignore_failure);
7177ac45 YW	173	if (k < 0 && r >= 0)
7177ac45 YW	174	r = k;
9c37b41c LP	175	}
9c37b41c LP	176
e0f42479	177	return r;
9c37b41c LP	178	}
9c37b41c LP	179
b2ae4d9e	180	static int parse_file(OrderedHashmap *sysctl_options, const char path, bool ignore_enoent) {
fabe5c0e	181	_cleanup_fclose_ FILE *f = NULL;
2708160c	182	_cleanup_free_ char *pp = NULL;
98bf5011	183	unsigned c = 0;
fabe5c0e	184	int r;
8e1bd70d LP	185
	186	assert(path);
	187
2708160c	188	r = search_and_fopen(path, "re", NULL, (const char**) CONF_PATHS_STRV("sysctl.d"), &f, &pp);
fabe5c0e	189	if (r < 0) {
6f6fad96	190	if (ignore_enoent && r == -ENOENT)
c1b664d0 LP	191	return 0;
c1b664d0 LP	192
8d3d7072	193	return log_error_errno(r, "Failed to open file '%s', ignoring: %m", path);
8e1bd70d LP	194	}
8e1bd70d LP	195
2708160c	196	log_debug("Parsing %s", pp);
4f14f2bb	197	for (;;) {
dec02d6e	198	_cleanup_(option_freep) Option *new_option = NULL;
a668bfe8	199	_cleanup_free_ char *l = NULL;
e0f42479	200	bool ignore_failure = false;
dec02d6e LP	201	Option *existing;
dec02d6e LP	202	char p, value;
fabe5c0e	203	int k;
548f6937	204
a668bfe8 TSH	205	k = read_line(f, LONG_LINE_MAX, &l);
	206	if (k == 0)
	207	break;
a668bfe8	208	if (k < 0)
2708160c	209	return log_error_errno(k, "Failed to read file '%s', ignoring: %m", pp);
8e1bd70d	210
98bf5011 LP	211	c++;
98bf5011 LP	212
8e1bd70d	213	p = strstrip(l);
8e1bd70d	214
548f6937 LP	215	if (isempty(p))
548f6937 LP	216	continue;
d3b6d0c2	217	if (strchr(COMMENTS "\n", *p))
8e1bd70d LP	218	continue;
8e1bd70d LP	219
86fc77c4	220	value = strchr(p, '=');
e0f42479 ZJS	221	if (value) {
	222	if (p[0] == '-') {
	223	ignore_failure = true;
	224	p++;
	225	}
8e1bd70d	226
e0f42479 ZJS	227	*value = 0;
	228	value++;
	229	value = strstrip(value);
8e1bd70d	230
e0f42479 ZJS	231	} else {
	232	if (p[0] == '-')
	233	/* We have a "negative match" option. Let's continue with value==NULL. */
	234	p++;
	235	else {
2708160c	236	log_syntax(NULL, LOG_WARNING, pp, c, 0,
e0f42479 ZJS	237	"Line is not an assignment, ignoring: %s", p);
	238	if (r == 0)
	239	r = -EINVAL;
	240	continue;
	241	}
	242	}
dec02d6e	243
e0f42479	244	p = strstrip(p);
dec02d6e	245	p = sysctl_normalize(p);
fabe5c0e	246
e0f42479 ZJS	247	/* We can't filter out globs at this point, we'll need to do that later. */
	248	if (!string_is_glob(p) &&
	249	!test_prefix(p))
b99802f7	250	continue;
b99802f7	251
b2ae4d9e	252	existing = ordered_hashmap_get(*sysctl_options, p);
fabe5c0e	253	if (existing) {
db99904b	254	if (streq_ptr(value, existing->value)) {
dec02d6e	255	existing->ignore_failure = existing->ignore_failure \|\| ignore_failure;
04bf3c1a	256	continue;
dec02d6e	257	}
fabe5c0e	258
2708160c	259	log_debug("Overwriting earlier assignment of %s at '%s:%u'.", p, pp, c);
b2ae4d9e	260	option_free(ordered_hashmap_remove(*sysctl_options, p));
86fc77c4 MS	261	}
86fc77c4 MS	262
dec02d6e LP	263	new_option = option_new(p, value, ignore_failure);
dec02d6e LP	264	if (!new_option)
fabe5c0e LP	265	return log_oom();
fabe5c0e LP	266
350ffa97	267	k = ordered_hashmap_ensure_put(sysctl_options, &option_hash_ops, new_option->key, new_option);
dec02d6e LP	268	if (k < 0)
dec02d6e LP	269	return log_error_errno(k, "Failed to add sysctl variable %s to hashmap: %m", p);
86fc77c4	270
dec02d6e	271	TAKE_PTR(new_option);
8e1bd70d LP	272	}
8e1bd70d LP	273
c1b664d0	274	return r;
8e1bd70d LP	275	}
8e1bd70d LP	276
39f0d1d2 LP	277	static int read_credential_lines(OrderedHashmap **sysctl_options) {
	278	_cleanup_free_ char *j = NULL;
	279	const char *d;
	280	int r;
	281
	282	r = get_credentials_dir(&d);
	283	if (r == -ENXIO)
	284	return 0;
	285	if (r < 0)
	286	return log_error_errno(r, "Failed to get credentials directory: %m");
	287
	288	j = path_join(d, "sysctl.extra");
	289	if (!j)
	290	return log_oom();
	291
	292	(void) parse_file(sysctl_options, j, /* ignore_enoent= */ true);
	293	return 0;
	294	}
	295
37ec0fdd LP	296	static int help(void) {
	297	_cleanup_free_ char *link = NULL;
	298	int r;
	299
	300	r = terminal_urlify_man("systemd-sysctl.service", "8", &link);
	301	if (r < 0)
	302	return log_oom();
	303
7a2a0b90 LP	304	printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
	305	"Applies kernel sysctl settings.\n\n"
	306	" -h --help Show this help\n"
eb9da376	307	" --version Show package version\n"
3c51c626	308	" --cat-config Show configuration files\n"
0e1f5792	309	" --prefix=PATH Only apply rules with the specified prefix\n"
dcd5c891	310	" --no-pager Do not pipe output into a pager\n"
bc556335 DDM	311	"\nSee the %s for details.\n",
	312	program_invocation_short_name,
	313	link);
37ec0fdd LP	314
37ec0fdd LP	315	return 0;
7a2a0b90 LP	316	}
	317
	318	static int parse_argv(int argc, char *argv[]) {
	319
	320	enum {
eb9da376	321	ARG_VERSION = 0x100,
3c51c626 ZJS	322	ARG_CAT_CONFIG,
3c51c626 ZJS	323	ARG_PREFIX,
dcd5c891	324	ARG_NO_PAGER,
e88748c1	325	ARG_STRICT,
7a2a0b90 LP	326	};
	327
	328	static const struct option options[] = {
3c51c626 ZJS	329	{ "help", no_argument, NULL, 'h' },
	330	{ "version", no_argument, NULL, ARG_VERSION },
	331	{ "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
	332	{ "prefix", required_argument, NULL, ARG_PREFIX },
dcd5c891	333	{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
e88748c1	334	{ "strict", no_argument, NULL, ARG_STRICT },
eb9da376	335	{}
7a2a0b90 LP	336	};
	337
	338	int c;
	339
	340	assert(argc >= 0);
	341	assert(argv);
	342
601185b4	343	while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
7a2a0b90 LP	344
	345	switch (c) {
	346
	347	case 'h':
37ec0fdd	348	return help();
eb9da376 LP	349
eb9da376 LP	350	case ARG_VERSION:
3f6fd1ba	351	return version();
7a2a0b90	352
3c51c626 ZJS	353	case ARG_CAT_CONFIG:
	354	arg_cat_config = true;
	355	break;
	356
7a2a0b90	357	case ARG_PREFIX: {
c01404fd	358	const char *s;
7a2a0b90 LP	359	char *p;
7a2a0b90 LP	360
0e1f5792 DH	361	/* We used to require people to specify absolute paths
	362	* in /proc/sys in the past. This is kinda useless, but
	363	* we need to keep compatibility. We now support any
	364	* sysctl name available. */
88a60da0	365	sysctl_normalize(optarg);
e50b33be	366
c01404fd YW	367	s = path_startswith(optarg, "/proc/sys");
c01404fd YW	368	p = strdup(s ?: optarg);
0e1f5792 DH	369	if (!p)
0e1f5792 DH	370	return log_oom();
e50b33be	371
0e1f5792	372	if (strv_consume(&arg_prefixes, p) < 0)
0d0f0c50	373	return log_oom();
f68c5a70	374
7a2a0b90 LP	375	break;
	376	}
	377
dcd5c891	378	case ARG_NO_PAGER:
0221d68a	379	arg_pager_flags \|= PAGER_DISABLE;
dcd5c891 LP	380	break;
dcd5c891 LP	381
e88748c1 QD	382	case ARG_STRICT:
	383	arg_strict = true;
	384	break;
	385
7a2a0b90 LP	386	case '?':
	387	return -EINVAL;
	388
	389	default:
04499a70	390	assert_not_reached();
7a2a0b90	391	}
7a2a0b90	392
baaa35ad ZJS	393	if (arg_cat_config && argc > optind)
	394	return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
	395	"Positional arguments are not allowed with --cat-config");
3c51c626	396
7a2a0b90 LP	397	return 1;
	398	}
	399
8eb42d90	400	static int run(int argc, char *argv[]) {
dec02d6e	401	_cleanup_(ordered_hashmap_freep) OrderedHashmap *sysctl_options = NULL;
a34c79d0	402	int r, k;
8e1bd70d	403
7a2a0b90 LP	404	r = parse_argv(argc, argv);
7a2a0b90 LP	405	if (r <= 0)
a34c79d0	406	return r;
7a2a0b90	407
d2acb93d	408	log_setup();
8e1bd70d	409
4c12626c LP	410	umask(0022);
4c12626c LP	411
de19ece7 LP	412	if (argc > optind) {
	413	int i;
	414
2de30233 LP	415	r = 0;
2de30233 LP	416
de19ece7	417	for (i = optind; i < argc; i++) {
b2ae4d9e	418	k = parse_file(&sysctl_options, argv[i], false);
fabe5c0e	419	if (k < 0 && r == 0)
de19ece7 LP	420	r = k;
	421	}
	422	} else {
fabe5c0e	423	_cleanup_strv_free_ char **files = NULL;
c1b664d0	424
a826d4f7	425	r = conf_files_list_strv(&files, ".conf", NULL, 0, (const char**) CONF_PATHS_STRV("sysctl.d"));
a34c79d0 ZJS	426	if (r < 0)
a34c79d0 ZJS	427	return log_error_errno(r, "Failed to enumerate sysctl.d files: %m");
db1413d7	428
3c51c626	429	if (arg_cat_config) {
384c2c32	430	pager_open(arg_pager_flags);
dcd5c891	431
a34c79d0	432	return cat_files(NULL, files, 0);
3c51c626 ZJS	433	}
3c51c626 ZJS	434
fabe5c0e	435	STRV_FOREACH(f, files) {
b2ae4d9e	436	k = parse_file(&sysctl_options, *f, true);
fabe5c0e	437	if (k < 0 && r == 0)
db1413d7 KS	438	r = k;
db1413d7 KS	439	}
39f0d1d2 LP	440
	441	k = read_credential_lines(&sysctl_options);
	442	if (k < 0 && r == 0)
	443	r = k;
8e1bd70d	444	}
86fc77c4	445
fabe5c0e LP	446	k = apply_all(sysctl_options);
fabe5c0e LP	447	if (k < 0 && r == 0)
0187f62b LP	448	r = k;
0187f62b LP	449
8eb42d90	450	return r;
8e1bd70d	451	}
8eb42d90 LP	452
8eb42d90 LP	453	DEFINE_MAIN_FUNCTION(run);