0c69794138
These lines are generally out-of-date, incomplete and unnecessary. With SPDX and git repository much more accurate and fine grained information about licensing and authorship is available, hence let's drop the per-file copyright notice. Of course, removing copyright lines of others is problematic, hence this commit only removes my own lines and leaves all others untouched. It might be nicer if sooner or later those could go away too, making git the only and accurate source of authorship information.
319 lines
9.7 KiB
C
319 lines
9.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <getopt.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "conf-files.h"
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#include "def.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "hashmap.h"
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#include "log.h"
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#include "pager.h"
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#include "path-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "sysctl-util.h"
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#include "terminal-util.h"
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#include "util.h"
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static char **arg_prefixes = NULL;
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static bool arg_cat_config = false;
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static bool arg_no_pager = false;
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static int apply_all(OrderedHashmap *sysctl_options) {
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char *property, *value;
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Iterator i;
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int r = 0;
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ORDERED_HASHMAP_FOREACH_KEY(value, property, sysctl_options, i) {
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int k;
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k = sysctl_write(property, value);
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if (k < 0) {
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/* If the sysctl is not available in the kernel or we are running with reduced privileges and
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* cannot write it, then log about the issue at LOG_NOTICE level, and proceed without
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* failing. (EROFS is treated as a permission problem here, since that's how container managers
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* usually protected their sysctls.) In all other cases log an error and make the tool fail. */
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if (IN_SET(k, -EPERM, -EACCES, -EROFS, -ENOENT))
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log_notice_errno(k, "Couldn't write '%s' to '%s', ignoring: %m", value, property);
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else {
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log_error_errno(k, "Couldn't write '%s' to '%s': %m", value, property);
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if (r == 0)
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r = k;
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}
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}
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}
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return r;
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}
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static bool test_prefix(const char *p) {
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char **i;
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if (strv_isempty(arg_prefixes))
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return true;
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STRV_FOREACH(i, arg_prefixes) {
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const char *t;
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t = path_startswith(*i, "/proc/sys/");
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if (!t)
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t = *i;
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if (path_startswith(p, t))
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return true;
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}
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return false;
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}
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static int parse_file(OrderedHashmap *sysctl_options, const char *path, bool ignore_enoent) {
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_cleanup_fclose_ FILE *f = NULL;
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unsigned c = 0;
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int r;
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assert(path);
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r = search_and_fopen(path, "re", NULL, (const char**) CONF_PATHS_STRV("sysctl.d"), &f);
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if (r < 0) {
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if (ignore_enoent && r == -ENOENT)
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return 0;
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return log_error_errno(r, "Failed to open file '%s', ignoring: %m", path);
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}
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log_debug("Parsing %s", path);
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for (;;) {
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char *p, *value, *new_value, *property, *existing;
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_cleanup_free_ char *l = NULL;
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void *v;
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int k;
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k = read_line(f, LONG_LINE_MAX, &l);
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if (k == 0)
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break;
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if (k < 0)
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return log_error_errno(k, "Failed to read file '%s', ignoring: %m", path);
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c++;
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p = strstrip(l);
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if (isempty(p))
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continue;
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if (strchr(COMMENTS "\n", *p))
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continue;
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value = strchr(p, '=');
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if (!value) {
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log_error("Line is not an assignment at '%s:%u': %s", path, c, value);
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if (r == 0)
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r = -EINVAL;
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continue;
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}
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*value = 0;
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value++;
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p = sysctl_normalize(strstrip(p));
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value = strstrip(value);
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if (!test_prefix(p))
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continue;
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existing = ordered_hashmap_get2(sysctl_options, p, &v);
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if (existing) {
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if (streq(value, existing))
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continue;
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log_debug("Overwriting earlier assignment of %s at '%s:%u'.", p, path, c);
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free(ordered_hashmap_remove(sysctl_options, p));
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free(v);
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}
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property = strdup(p);
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if (!property)
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return log_oom();
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new_value = strdup(value);
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if (!new_value) {
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free(property);
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return log_oom();
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}
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k = ordered_hashmap_put(sysctl_options, property, new_value);
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if (k < 0) {
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log_error_errno(k, "Failed to add sysctl variable %s to hashmap: %m", property);
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free(property);
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free(new_value);
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return k;
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}
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}
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return r;
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}
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static void help(void) {
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printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
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"Applies kernel sysctl settings.\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n"
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" --cat-config Show configuration files\n"
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" --prefix=PATH Only apply rules with the specified prefix\n"
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" --no-pager Do not pipe output into a pager\n"
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, program_invocation_short_name);
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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ARG_CAT_CONFIG,
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ARG_PREFIX,
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ARG_NO_PAGER,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
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{ "prefix", required_argument, NULL, ARG_PREFIX },
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{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
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{}
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};
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int c;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
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switch (c) {
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case 'h':
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help();
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return 0;
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case ARG_VERSION:
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return version();
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case ARG_CAT_CONFIG:
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arg_cat_config = true;
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break;
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case ARG_PREFIX: {
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char *p;
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/* We used to require people to specify absolute paths
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* in /proc/sys in the past. This is kinda useless, but
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* we need to keep compatibility. We now support any
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* sysctl name available. */
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sysctl_normalize(optarg);
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if (path_startswith(optarg, "/proc/sys"))
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p = strdup(optarg);
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else
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p = strappend("/proc/sys/", optarg);
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if (!p)
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return log_oom();
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if (strv_consume(&arg_prefixes, p) < 0)
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return log_oom();
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break;
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}
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case ARG_NO_PAGER:
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arg_no_pager = true;
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break;
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unhandled option");
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}
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if (arg_cat_config && argc > optind) {
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log_error("Positional arguments are not allowed with --cat-config");
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return -EINVAL;
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}
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return 1;
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}
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int main(int argc, char *argv[]) {
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OrderedHashmap *sysctl_options = NULL;
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int r = 0, k;
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r = parse_argv(argc, argv);
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if (r <= 0)
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goto finish;
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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umask(0022);
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sysctl_options = ordered_hashmap_new(&path_hash_ops);
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if (!sysctl_options) {
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r = log_oom();
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goto finish;
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}
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r = 0;
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if (argc > optind) {
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int i;
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for (i = optind; i < argc; i++) {
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k = parse_file(sysctl_options, argv[i], false);
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if (k < 0 && r == 0)
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r = k;
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}
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} else {
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_cleanup_strv_free_ char **files = NULL;
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char **f;
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r = conf_files_list_strv(&files, ".conf", NULL, 0, (const char**) CONF_PATHS_STRV("sysctl.d"));
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if (r < 0) {
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log_error_errno(r, "Failed to enumerate sysctl.d files: %m");
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goto finish;
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}
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if (arg_cat_config) {
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(void) pager_open(arg_no_pager, false);
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r = cat_files(NULL, files, 0);
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goto finish;
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}
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STRV_FOREACH(f, files) {
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k = parse_file(sysctl_options, *f, true);
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if (k < 0 && r == 0)
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r = k;
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}
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}
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k = apply_all(sysctl_options);
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if (k < 0 && r == 0)
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r = k;
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finish:
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pager_close();
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ordered_hashmap_free_free_free(sysctl_options);
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strv_free(arg_prefixes);
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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