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

/* SPDX-License-Identifier: LGPL-2.1+ */

#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) {
        char **i;

        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;
                        char **s;

                        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_info("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;
        unsigned c = 0;
        int r;

        assert(path);

        r = search_and_fopen(path, "re", NULL, (const char**) CONF_PATHS_STRV("sysctl.d"), &f);
        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", path);
        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", path);

                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, path, 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, path, 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("Unhandled option");
                }

        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_service();

        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;
                char **f;

                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) {
                        (void) 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
53e1b683	1	/* SPDX-License-Identifier: LGPL-2.1+ */
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 ZJS	53	static bool test_prefix(const char *p) {
	54	char **i;
	55
	56	if (strv_isempty(arg_prefixes))
	57	return true;
	58
	59	STRV_FOREACH(i, arg_prefixes) {
	60	const char *t;
	61
	62	t = path_startswith(*i, "/proc/sys/");
	63	if (!t)
	64	t = *i;
	65
	66	if (path_startswith(p, t))
	67	return true;
	68	}
	69
	70	return false;
	71	}
	72
dec02d6e LP	73	static Option *option_new(
	74	const char *key,
	75	const char *value,
	76	bool ignore_failure) {
	77
	78	_cleanup_(option_freep) Option *o = NULL;
	79
	80	assert(key);
dec02d6e LP	81
	82	o = new(Option, 1);
	83	if (!o)
	84	return NULL;
	85
	86	*o = (Option) {
	87	.key = strdup(key),
e0f42479	88	.value = value ? strdup(value) : NULL,
dec02d6e LP	89	.ignore_failure = ignore_failure,
	90	};
	91
e0f42479 ZJS	92	if (!o->key)
	93	return NULL;
	94	if (value && !o->value)
dec02d6e LP	95	return NULL;
	96
	97	return TAKE_PTR(o);
	98	}
	99
e0f42479 ZJS	100	static int sysctl_write_or_warn(const char key, const char value, bool ignore_failure) {
	101	int r;
	102
	103	r = sysctl_write(key, value);
	104	if (r < 0) {
	105	/* If the sysctl is not available in the kernel or we are running with reduced privileges and
	106	* cannot write it, then log about the issue, and proceed without failing. (EROFS is treated
	107	* as a permission problem here, since that's how container managers usually protected their
	108	* sysctls.) In all other cases log an error and make the tool fail. */
	109	if (ignore_failure \|\| r == -EROFS \|\| ERRNO_IS_PRIVILEGE(r))
	110	log_debug_errno(r, "Couldn't write '%s' to '%s', ignoring: %m", value, key);
	111	else if (r == -ENOENT)
	112	log_info_errno(r, "Couldn't write '%s' to '%s', ignoring: %m", value, key);
	113	else
	114	return log_error_errno(r, "Couldn't write '%s' to '%s': %m", value, key);
	115	}
	116
	117	return 0;
	118	}
	119
886cf982	120	static int apply_all(OrderedHashmap *sysctl_options) {
dec02d6e	121	Option *option;
e50b33be	122	int r = 0;
fabe5c0e	123
90e74a66	124	ORDERED_HASHMAP_FOREACH(option, sysctl_options) {
86fc77c4 MS	125	int k;
86fc77c4 MS	126
e0f42479 ZJS	127	/* Ignore "negative match" options, they are there only to exclude stuff from globs. */
	128	if (!option->value)
	129	continue;
e50b33be	130
e0f42479 ZJS	131	if (string_is_glob(option->key)) {
	132	_cleanup_strv_free_ char **paths = NULL;
	133	_cleanup_free_ char *pattern = NULL;
	134	char **s;
86fc77c4	135
e0f42479 ZJS	136	pattern = path_join("/proc/sys", option->key);
	137	if (!pattern)
	138	return log_oom();
9c37b41c	139
544e146b	140	k = glob_extend(&paths, pattern, GLOB_NOCHECK);
e0f42479	141	if (k < 0) {
c53ce14d	142	if (option->ignore_failure \|\| ERRNO_IS_PRIVILEGE(k))
e0f42479 ZJS	143	log_debug_errno(k, "Failed to resolve glob '%s', ignoring: %m",
	144	option->key);
	145	else {
	146	log_error_errno(k, "Couldn't resolve glob '%s': %m",
	147	option->key);
	148	if (r == 0)
	149	r = k;
	150	}
9c37b41c	151
e0f42479 ZJS	152	} else if (strv_isempty(paths))
e0f42479 ZJS	153	log_debug("No match for glob: %s", option->key);
9c37b41c	154
e0f42479 ZJS	155	STRV_FOREACH(s, paths) {
	156	const char *key;
	157
	158	assert_se(key = path_startswith(*s, "/proc/sys"));
	159
	160	if (!test_prefix(key))
	161	continue;
	162
	163	if (ordered_hashmap_contains(sysctl_options, key)) {
	164	log_info("Not setting %s (explicit setting exists).", key);
	165	continue;
	166	}
	167
	168	k = sysctl_write_or_warn(key, option->value, option->ignore_failure);
	169	if (r == 0)
	170	r = k;
	171	}
	172
	173	} else {
	174	k = sysctl_write_or_warn(option->key, option->value, option->ignore_failure);
	175	if (r == 0)
	176	r = k;
	177	}
9c37b41c LP	178	}
9c37b41c LP	179
e0f42479	180	return r;
9c37b41c LP	181	}
9c37b41c LP	182
b2ae4d9e	183	static int parse_file(OrderedHashmap *sysctl_options, const char path, bool ignore_enoent) {
fabe5c0e	184	_cleanup_fclose_ FILE *f = NULL;
98bf5011	185	unsigned c = 0;
fabe5c0e	186	int r;
8e1bd70d LP	187
	188	assert(path);
	189
a826d4f7	190	r = search_and_fopen(path, "re", NULL, (const char**) CONF_PATHS_STRV("sysctl.d"), &f);
fabe5c0e	191	if (r < 0) {
6f6fad96	192	if (ignore_enoent && r == -ENOENT)
c1b664d0 LP	193	return 0;
c1b664d0 LP	194
8d3d7072	195	return log_error_errno(r, "Failed to open file '%s', ignoring: %m", path);
8e1bd70d LP	196	}
8e1bd70d LP	197
924bc14f	198	log_debug("Parsing %s", path);
4f14f2bb	199	for (;;) {
dec02d6e	200	_cleanup_(option_freep) Option *new_option = NULL;
a668bfe8	201	_cleanup_free_ char *l = NULL;
e0f42479	202	bool ignore_failure = false;
dec02d6e LP	203	Option *existing;
dec02d6e LP	204	char p, value;
fabe5c0e	205	int k;
548f6937	206
a668bfe8 TSH	207	k = read_line(f, LONG_LINE_MAX, &l);
	208	if (k == 0)
	209	break;
a668bfe8 TSH	210	if (k < 0)
a668bfe8 TSH	211	return log_error_errno(k, "Failed to read file '%s', ignoring: %m", path);
8e1bd70d	212
98bf5011 LP	213	c++;
98bf5011 LP	214
8e1bd70d	215	p = strstrip(l);
8e1bd70d	216
548f6937 LP	217	if (isempty(p))
548f6937 LP	218	continue;
d3b6d0c2	219	if (strchr(COMMENTS "\n", *p))
8e1bd70d LP	220	continue;
8e1bd70d LP	221
86fc77c4	222	value = strchr(p, '=');
e0f42479 ZJS	223	if (value) {
	224	if (p[0] == '-') {
	225	ignore_failure = true;
	226	p++;
	227	}
8e1bd70d	228
e0f42479 ZJS	229	*value = 0;
	230	value++;
	231	value = strstrip(value);
8e1bd70d	232
e0f42479 ZJS	233	} else {
	234	if (p[0] == '-')
	235	/* We have a "negative match" option. Let's continue with value==NULL. */
	236	p++;
	237	else {
	238	log_syntax(NULL, LOG_WARNING, path, c, 0,
	239	"Line is not an assignment, ignoring: %s", p);
	240	if (r == 0)
	241	r = -EINVAL;
	242	continue;
	243	}
	244	}
dec02d6e	245
e0f42479	246	p = strstrip(p);
dec02d6e	247	p = sysctl_normalize(p);
fabe5c0e	248
e0f42479 ZJS	249	/* We can't filter out globs at this point, we'll need to do that later. */
	250	if (!string_is_glob(p) &&
	251	!test_prefix(p))
b99802f7	252	continue;
b99802f7	253
b2ae4d9e ZJS	254	if (ordered_hashmap_ensure_allocated(sysctl_options, &option_hash_ops) < 0)
	255	return log_oom();
	256
	257	existing = ordered_hashmap_get(*sysctl_options, p);
fabe5c0e	258	if (existing) {
db99904b	259	if (streq_ptr(value, existing->value)) {
dec02d6e	260	existing->ignore_failure = existing->ignore_failure \|\| ignore_failure;
04bf3c1a	261	continue;
dec02d6e	262	}
fabe5c0e	263
98bf5011	264	log_debug("Overwriting earlier assignment of %s at '%s:%u'.", p, path, c);
b2ae4d9e	265	option_free(ordered_hashmap_remove(*sysctl_options, p));
86fc77c4 MS	266	}
86fc77c4 MS	267
dec02d6e LP	268	new_option = option_new(p, value, ignore_failure);
dec02d6e LP	269	if (!new_option)
fabe5c0e LP	270	return log_oom();
fabe5c0e LP	271
b2ae4d9e	272	k = ordered_hashmap_put(*sysctl_options, new_option->key, new_option);
dec02d6e LP	273	if (k < 0)
dec02d6e LP	274	return log_error_errno(k, "Failed to add sysctl variable %s to hashmap: %m", p);
86fc77c4	275
dec02d6e	276	TAKE_PTR(new_option);
8e1bd70d LP	277	}
8e1bd70d LP	278
c1b664d0	279	return r;
8e1bd70d LP	280	}
8e1bd70d LP	281
37ec0fdd LP	282	static int help(void) {
	283	_cleanup_free_ char *link = NULL;
	284	int r;
	285
	286	r = terminal_urlify_man("systemd-sysctl.service", "8", &link);
	287	if (r < 0)
	288	return log_oom();
	289
7a2a0b90 LP	290	printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
	291	"Applies kernel sysctl settings.\n\n"
	292	" -h --help Show this help\n"
eb9da376	293	" --version Show package version\n"
3c51c626	294	" --cat-config Show configuration files\n"
0e1f5792	295	" --prefix=PATH Only apply rules with the specified prefix\n"
dcd5c891	296	" --no-pager Do not pipe output into a pager\n"
37ec0fdd LP	297	"\nSee the %s for details.\n"
	298	, program_invocation_short_name
	299	, link
	300	);
	301
	302	return 0;
7a2a0b90 LP	303	}
	304
	305	static int parse_argv(int argc, char *argv[]) {
	306
	307	enum {
eb9da376	308	ARG_VERSION = 0x100,
3c51c626 ZJS	309	ARG_CAT_CONFIG,
3c51c626 ZJS	310	ARG_PREFIX,
dcd5c891	311	ARG_NO_PAGER,
7a2a0b90 LP	312	};
	313
	314	static const struct option options[] = {
3c51c626 ZJS	315	{ "help", no_argument, NULL, 'h' },
	316	{ "version", no_argument, NULL, ARG_VERSION },
	317	{ "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
	318	{ "prefix", required_argument, NULL, ARG_PREFIX },
dcd5c891	319	{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
eb9da376	320	{}
7a2a0b90 LP	321	};
	322
	323	int c;
	324
	325	assert(argc >= 0);
	326	assert(argv);
	327
601185b4	328	while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
7a2a0b90 LP	329
	330	switch (c) {
	331
	332	case 'h':
37ec0fdd	333	return help();
eb9da376 LP	334
eb9da376 LP	335	case ARG_VERSION:
3f6fd1ba	336	return version();
7a2a0b90	337
3c51c626 ZJS	338	case ARG_CAT_CONFIG:
	339	arg_cat_config = true;
	340	break;
	341
7a2a0b90 LP	342	case ARG_PREFIX: {
	343	char *p;
	344
0e1f5792 DH	345	/* We used to require people to specify absolute paths
	346	* in /proc/sys in the past. This is kinda useless, but
	347	* we need to keep compatibility. We now support any
	348	* sysctl name available. */
88a60da0	349	sysctl_normalize(optarg);
e50b33be	350
27458ed6	351	if (path_startswith(optarg, "/proc/sys"))
0e1f5792 DH	352	p = strdup(optarg);
0e1f5792 DH	353	else
b910cc72	354	p = path_join("/proc/sys", optarg);
0e1f5792 DH	355	if (!p)
0e1f5792 DH	356	return log_oom();
e50b33be	357
0e1f5792	358	if (strv_consume(&arg_prefixes, p) < 0)
0d0f0c50	359	return log_oom();
f68c5a70	360
7a2a0b90 LP	361	break;
	362	}
	363
dcd5c891	364	case ARG_NO_PAGER:
0221d68a	365	arg_pager_flags \|= PAGER_DISABLE;
dcd5c891 LP	366	break;
dcd5c891 LP	367
7a2a0b90 LP	368	case '?':
	369	return -EINVAL;
	370
	371	default:
eb9da376	372	assert_not_reached("Unhandled option");
7a2a0b90	373	}
7a2a0b90	374
baaa35ad ZJS	375	if (arg_cat_config && argc > optind)
	376	return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
	377	"Positional arguments are not allowed with --cat-config");
3c51c626	378
7a2a0b90 LP	379	return 1;
	380	}
	381
8eb42d90	382	static int run(int argc, char *argv[]) {
dec02d6e	383	_cleanup_(ordered_hashmap_freep) OrderedHashmap *sysctl_options = NULL;
a34c79d0	384	int r, k;
8e1bd70d	385
7a2a0b90 LP	386	r = parse_argv(argc, argv);
7a2a0b90 LP	387	if (r <= 0)
a34c79d0	388	return r;
7a2a0b90	389
6bf3c61c	390	log_setup_service();
8e1bd70d	391
4c12626c LP	392	umask(0022);
4c12626c LP	393
de19ece7 LP	394	if (argc > optind) {
	395	int i;
	396
2de30233 LP	397	r = 0;
2de30233 LP	398
de19ece7	399	for (i = optind; i < argc; i++) {
b2ae4d9e	400	k = parse_file(&sysctl_options, argv[i], false);
fabe5c0e	401	if (k < 0 && r == 0)
de19ece7 LP	402	r = k;
	403	}
	404	} else {
fabe5c0e LP	405	_cleanup_strv_free_ char **files = NULL;
fabe5c0e LP	406	char **f;
c1b664d0	407
a826d4f7	408	r = conf_files_list_strv(&files, ".conf", NULL, 0, (const char**) CONF_PATHS_STRV("sysctl.d"));
a34c79d0 ZJS	409	if (r < 0)
a34c79d0 ZJS	410	return log_error_errno(r, "Failed to enumerate sysctl.d files: %m");
db1413d7	411
3c51c626	412	if (arg_cat_config) {
0221d68a	413	(void) pager_open(arg_pager_flags);
dcd5c891	414
a34c79d0	415	return cat_files(NULL, files, 0);
3c51c626 ZJS	416	}
3c51c626 ZJS	417
fabe5c0e	418	STRV_FOREACH(f, files) {
b2ae4d9e	419	k = parse_file(&sysctl_options, *f, true);
fabe5c0e	420	if (k < 0 && r == 0)
db1413d7 KS	421	r = k;
db1413d7 KS	422	}
8e1bd70d	423	}
86fc77c4	424
fabe5c0e LP	425	k = apply_all(sysctl_options);
fabe5c0e LP	426	if (k < 0 && r == 0)
0187f62b LP	427	r = k;
0187f62b LP	428
8eb42d90	429	return r;
8e1bd70d	430	}
8eb42d90 LP	431
8eb42d90 LP	432	DEFINE_MAIN_FUNCTION(run);