[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 "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 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;

        STRV_FOREACH(i, arg_prefixes) {
                const char *t;

                t = path_startswith(*i, "/proc/sys/");
                if (!t)
                        t = *i;

                if (path_startswith(p, t))
                        return true;
        }

        return false;
}

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) {
                /* 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. (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 || r == -EROFS || ERRNO_IS_PRIVILEGE(r))
                        log_debug_errno(r, "Couldn't write '%s' to '%s', ignoring: %m", value, key);
                else if (r == -ENOENT)
                        log_info_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_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)) {
                        _cleanup_strv_free_ char **paths = NULL;
                        _cleanup_free_ char *pattern = NULL;

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

                        k = glob_extend(&paths, pattern, GLOB_NOCHECK);
                        if (k < 0) {
                                if (option->ignore_failure || ERRNO_IS_PRIVILEGE(k))
                                        log_debug_errno(k, "Failed to resolve glob '%s', ignoring: %m",
                                                        option->key);
                                else {
                                        log_error_errno(k, "Couldn't resolve glob '%s': %m",
                                                        option->key);
                                        if (r == 0)
                                                r = k;
                                }

                        } else if (strv_isempty(paths))
                                log_debug("No match for glob: %s", 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 (r == 0)
                                        r = k;
                        }

                } else {
                        k = sysctl_write_or_warn(option->key, option->value, option->ignore_failure);
                        if (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;

                if (ordered_hashmap_ensure_allocated(sysctl_options, &option_hash_ops) < 0)
                        return log_oom();

                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_put(*sysctl_options, 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 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,
        };

        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   },
                {}
        };

        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: {
                        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);

                        if (path_startswith(optarg, "/proc/sys"))
                                p = strdup(optarg);
                        else
                                p = path_join("/proc/sys", 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 '?':
                        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 = 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"
a0f29c76	13	#include "def.h"
32458cc9	14	#include "errno-util.h"
3ffd4af2	15	#include "fd-util.h"
a5c32cff	16	#include "fileio.h"
e0f42479	17	#include "glob-util.h"
3f6fd1ba LP	18	#include "hashmap.h"
3f6fd1ba LP	19	#include "log.h"
8eb42d90	20	#include "main-func.h"
dcd5c891	21	#include "pager.h"
3f6fd1ba	22	#include "path-util.h"
294bf0c3	23	#include "pretty-print.h"
07630cea	24	#include "string-util.h"
3f6fd1ba	25	#include "strv.h"
88a60da0	26	#include "sysctl-util.h"
8e1bd70d	27
fabe5c0e	28	static char **arg_prefixes = NULL;
3c51c626	29	static bool arg_cat_config = false;
0221d68a	30	static PagerFlags arg_pager_flags = 0;
8e1bd70d	31
fd8bdbc7 LP	32	STATIC_DESTRUCTOR_REGISTER(arg_prefixes, strv_freep);
fd8bdbc7 LP	33
dec02d6e LP	34	typedef struct Option {
	35	char *key;
	36	char *value;
	37	bool ignore_failure;
	38	} Option;
	39
	40	static Option option_free(Option o) {
	41	if (!o)
	42	return NULL;
	43
	44	free(o->key);
	45	free(o->value);
	46
	47	return mfree(o);
	48	}
	49
	50	DEFINE_TRIVIAL_CLEANUP_FUNC(Option*, option_free);
	51	DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(option_hash_ops, char, string_hash_func, string_compare_func, Option, option_free);
	52
e0f42479	53	static bool test_prefix(const char *p) {
e0f42479 ZJS	54	if (strv_isempty(arg_prefixes))
	55	return true;
	56
	57	STRV_FOREACH(i, arg_prefixes) {
	58	const char *t;
	59
	60	t = path_startswith(*i, "/proc/sys/");
	61	if (!t)
	62	t = *i;
	63
	64	if (path_startswith(p, t))
	65	return true;
	66	}
	67
	68	return false;
	69	}
	70
dec02d6e LP	71	static Option *option_new(
	72	const char *key,
	73	const char *value,
	74	bool ignore_failure) {
	75
	76	_cleanup_(option_freep) Option *o = NULL;
	77
	78	assert(key);
dec02d6e LP	79
	80	o = new(Option, 1);
	81	if (!o)
	82	return NULL;
	83
	84	*o = (Option) {
	85	.key = strdup(key),
e0f42479	86	.value = value ? strdup(value) : NULL,
dec02d6e LP	87	.ignore_failure = ignore_failure,
	88	};
	89
e0f42479 ZJS	90	if (!o->key)
	91	return NULL;
	92	if (value && !o->value)
dec02d6e LP	93	return NULL;
	94
	95	return TAKE_PTR(o);
	96	}
	97
e0f42479 ZJS	98	static int sysctl_write_or_warn(const char key, const char value, bool ignore_failure) {
	99	int r;
	100
	101	r = sysctl_write(key, value);
	102	if (r < 0) {
	103	/* If the sysctl is not available in the kernel or we are running with reduced privileges and
	104	* cannot write it, then log about the issue, and proceed without failing. (EROFS is treated
	105	* as a permission problem here, since that's how container managers usually protected their
	106	* sysctls.) In all other cases log an error and make the tool fail. */
	107	if (ignore_failure \|\| r == -EROFS \|\| ERRNO_IS_PRIVILEGE(r))
	108	log_debug_errno(r, "Couldn't write '%s' to '%s', ignoring: %m", value, key);
	109	else if (r == -ENOENT)
	110	log_info_errno(r, "Couldn't write '%s' to '%s', ignoring: %m", value, key);
	111	else
	112	return log_error_errno(r, "Couldn't write '%s' to '%s': %m", value, key);
	113	}
	114
	115	return 0;
	116	}
	117
886cf982	118	static int apply_all(OrderedHashmap *sysctl_options) {
dec02d6e	119	Option *option;
e50b33be	120	int r = 0;
fabe5c0e	121
90e74a66	122	ORDERED_HASHMAP_FOREACH(option, sysctl_options) {
86fc77c4 MS	123	int k;
86fc77c4 MS	124
e0f42479 ZJS	125	/* Ignore "negative match" options, they are there only to exclude stuff from globs. */
	126	if (!option->value)
	127	continue;
e50b33be	128
e0f42479 ZJS	129	if (string_is_glob(option->key)) {
	130	_cleanup_strv_free_ char **paths = NULL;
	131	_cleanup_free_ char *pattern = NULL;
86fc77c4	132
e0f42479 ZJS	133	pattern = path_join("/proc/sys", option->key);
	134	if (!pattern)
	135	return log_oom();
9c37b41c	136
544e146b	137	k = glob_extend(&paths, pattern, GLOB_NOCHECK);
e0f42479	138	if (k < 0) {
c53ce14d	139	if (option->ignore_failure \|\| ERRNO_IS_PRIVILEGE(k))
e0f42479 ZJS	140	log_debug_errno(k, "Failed to resolve glob '%s', ignoring: %m",
	141	option->key);
	142	else {
	143	log_error_errno(k, "Couldn't resolve glob '%s': %m",
	144	option->key);
	145	if (r == 0)
	146	r = k;
	147	}
9c37b41c	148
e0f42479 ZJS	149	} else if (strv_isempty(paths))
e0f42479 ZJS	150	log_debug("No match for glob: %s", option->key);
9c37b41c	151
e0f42479 ZJS	152	STRV_FOREACH(s, paths) {
	153	const char *key;
	154
	155	assert_se(key = path_startswith(*s, "/proc/sys"));
	156
	157	if (!test_prefix(key))
	158	continue;
	159
	160	if (ordered_hashmap_contains(sysctl_options, key)) {
42a033f7	161	log_debug("Not setting %s (explicit setting exists).", key);
e0f42479 ZJS	162	continue;
	163	}
	164
	165	k = sysctl_write_or_warn(key, option->value, option->ignore_failure);
	166	if (r == 0)
	167	r = k;
	168	}
	169
	170	} else {
	171	k = sysctl_write_or_warn(option->key, option->value, option->ignore_failure);
	172	if (r == 0)
	173	r = k;
	174	}
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 ZJS	252	if (ordered_hashmap_ensure_allocated(sysctl_options, &option_hash_ops) < 0)
	253	return log_oom();
	254
	255	existing = ordered_hashmap_get(*sysctl_options, p);
fabe5c0e	256	if (existing) {
db99904b	257	if (streq_ptr(value, existing->value)) {
dec02d6e	258	existing->ignore_failure = existing->ignore_failure \|\| ignore_failure;
04bf3c1a	259	continue;
dec02d6e	260	}
fabe5c0e	261
2708160c	262	log_debug("Overwriting earlier assignment of %s at '%s:%u'.", p, pp, c);
b2ae4d9e	263	option_free(ordered_hashmap_remove(*sysctl_options, p));
86fc77c4 MS	264	}
86fc77c4 MS	265
dec02d6e LP	266	new_option = option_new(p, value, ignore_failure);
dec02d6e LP	267	if (!new_option)
fabe5c0e LP	268	return log_oom();
fabe5c0e LP	269
b2ae4d9e	270	k = ordered_hashmap_put(*sysctl_options, new_option->key, new_option);
dec02d6e LP	271	if (k < 0)
dec02d6e LP	272	return log_error_errno(k, "Failed to add sysctl variable %s to hashmap: %m", p);
86fc77c4	273
dec02d6e	274	TAKE_PTR(new_option);
8e1bd70d LP	275	}
8e1bd70d LP	276
c1b664d0	277	return r;
8e1bd70d LP	278	}
8e1bd70d LP	279
37ec0fdd LP	280	static int help(void) {
	281	_cleanup_free_ char *link = NULL;
	282	int r;
	283
	284	r = terminal_urlify_man("systemd-sysctl.service", "8", &link);
	285	if (r < 0)
	286	return log_oom();
	287
7a2a0b90 LP	288	printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
	289	"Applies kernel sysctl settings.\n\n"
	290	" -h --help Show this help\n"
eb9da376	291	" --version Show package version\n"
3c51c626	292	" --cat-config Show configuration files\n"
0e1f5792	293	" --prefix=PATH Only apply rules with the specified prefix\n"
dcd5c891	294	" --no-pager Do not pipe output into a pager\n"
bc556335 DDM	295	"\nSee the %s for details.\n",
	296	program_invocation_short_name,
	297	link);
37ec0fdd LP	298
37ec0fdd LP	299	return 0;
7a2a0b90 LP	300	}
	301
	302	static int parse_argv(int argc, char *argv[]) {
	303
	304	enum {
eb9da376	305	ARG_VERSION = 0x100,
3c51c626 ZJS	306	ARG_CAT_CONFIG,
3c51c626 ZJS	307	ARG_PREFIX,
dcd5c891	308	ARG_NO_PAGER,
7a2a0b90 LP	309	};
	310
	311	static const struct option options[] = {
3c51c626 ZJS	312	{ "help", no_argument, NULL, 'h' },
	313	{ "version", no_argument, NULL, ARG_VERSION },
	314	{ "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
	315	{ "prefix", required_argument, NULL, ARG_PREFIX },
dcd5c891	316	{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
eb9da376	317	{}
7a2a0b90 LP	318	};
	319
	320	int c;
	321
	322	assert(argc >= 0);
	323	assert(argv);
	324
601185b4	325	while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
7a2a0b90 LP	326
	327	switch (c) {
	328
	329	case 'h':
37ec0fdd	330	return help();
eb9da376 LP	331
eb9da376 LP	332	case ARG_VERSION:
3f6fd1ba	333	return version();
7a2a0b90	334
3c51c626 ZJS	335	case ARG_CAT_CONFIG:
	336	arg_cat_config = true;
	337	break;
	338
7a2a0b90 LP	339	case ARG_PREFIX: {
	340	char *p;
	341
0e1f5792 DH	342	/* We used to require people to specify absolute paths
	343	* in /proc/sys in the past. This is kinda useless, but
	344	* we need to keep compatibility. We now support any
	345	* sysctl name available. */
88a60da0	346	sysctl_normalize(optarg);
e50b33be	347
27458ed6	348	if (path_startswith(optarg, "/proc/sys"))
0e1f5792 DH	349	p = strdup(optarg);
0e1f5792 DH	350	else
b910cc72	351	p = path_join("/proc/sys", optarg);
0e1f5792 DH	352	if (!p)
0e1f5792 DH	353	return log_oom();
e50b33be	354
0e1f5792	355	if (strv_consume(&arg_prefixes, p) < 0)
0d0f0c50	356	return log_oom();
f68c5a70	357
7a2a0b90 LP	358	break;
	359	}
	360
dcd5c891	361	case ARG_NO_PAGER:
0221d68a	362	arg_pager_flags \|= PAGER_DISABLE;
dcd5c891 LP	363	break;
dcd5c891 LP	364
7a2a0b90 LP	365	case '?':
	366	return -EINVAL;
	367
	368	default:
04499a70	369	assert_not_reached();
7a2a0b90	370	}
7a2a0b90	371
baaa35ad ZJS	372	if (arg_cat_config && argc > optind)
	373	return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
	374	"Positional arguments are not allowed with --cat-config");
3c51c626	375
7a2a0b90 LP	376	return 1;
	377	}
	378
8eb42d90	379	static int run(int argc, char *argv[]) {
dec02d6e	380	_cleanup_(ordered_hashmap_freep) OrderedHashmap *sysctl_options = NULL;
a34c79d0	381	int r, k;
8e1bd70d	382
7a2a0b90 LP	383	r = parse_argv(argc, argv);
7a2a0b90 LP	384	if (r <= 0)
a34c79d0	385	return r;
7a2a0b90	386
d2acb93d	387	log_setup();
8e1bd70d	388
4c12626c LP	389	umask(0022);
4c12626c LP	390
de19ece7 LP	391	if (argc > optind) {
	392	int i;
	393
2de30233 LP	394	r = 0;
2de30233 LP	395
de19ece7	396	for (i = optind; i < argc; i++) {
b2ae4d9e	397	k = parse_file(&sysctl_options, argv[i], false);
fabe5c0e	398	if (k < 0 && r == 0)
de19ece7 LP	399	r = k;
	400	}
	401	} else {
fabe5c0e	402	_cleanup_strv_free_ char **files = NULL;
c1b664d0	403
a826d4f7	404	r = conf_files_list_strv(&files, ".conf", NULL, 0, (const char**) CONF_PATHS_STRV("sysctl.d"));
a34c79d0 ZJS	405	if (r < 0)
a34c79d0 ZJS	406	return log_error_errno(r, "Failed to enumerate sysctl.d files: %m");
db1413d7	407
3c51c626	408	if (arg_cat_config) {
384c2c32	409	pager_open(arg_pager_flags);
dcd5c891	410
a34c79d0	411	return cat_files(NULL, files, 0);
3c51c626 ZJS	412	}
3c51c626 ZJS	413
fabe5c0e	414	STRV_FOREACH(f, files) {
b2ae4d9e	415	k = parse_file(&sysctl_options, *f, true);
fabe5c0e	416	if (k < 0 && r == 0)
db1413d7 KS	417	r = k;
db1413d7 KS	418	}
8e1bd70d	419	}
86fc77c4	420
fabe5c0e LP	421	k = apply_all(sysctl_options);
fabe5c0e LP	422	if (k < 0 && r == 0)
0187f62b LP	423	r = k;
0187f62b LP	424
8eb42d90	425	return r;
8e1bd70d	426	}
8eb42d90 LP	427
8eb42d90 LP	428	DEFINE_MAIN_FUNCTION(run);