diff options
Diffstat (limited to 'src/grp-initprogs/systemd-sysctl')
| -rw-r--r-- | src/grp-initprogs/systemd-sysctl/50-default.sysctl | 40 | ||||
| -rw-r--r-- | src/grp-initprogs/systemd-sysctl/Makefile | 33 | ||||
| -rw-r--r-- | src/grp-initprogs/systemd-sysctl/sysctl.c | 287 | ||||
| -rw-r--r-- | src/grp-initprogs/systemd-sysctl/systemd-sysctl.service.in | 21 |
4 files changed, 381 insertions, 0 deletions
diff --git a/src/grp-initprogs/systemd-sysctl/50-default.sysctl b/src/grp-initprogs/systemd-sysctl/50-default.sysctl new file mode 100644 index 0000000000..def151bb84 --- /dev/null +++ b/src/grp-initprogs/systemd-sysctl/50-default.sysctl @@ -0,0 +1,40 @@ +# This file is part of systemd. +# +# systemd is free software; you can redistribute it and/or modify it +# under the terms of the GNU Lesser General Public License as published by +# the Free Software Foundation; either version 2.1 of the License, or +# (at your option) any later version. + +# See sysctl.d(5) and core(5) for for documentation. + +# To override settings in this file, create a local file in /etc +# (e.g. /etc/sysctl.d/90-override.conf), and put any assignments +# there. + +# System Request functionality of the kernel (SYNC) +# +# Use kernel.sysrq = 1 to allow all keys. +# See http://fedoraproject.org/wiki/QA/Sysrq for a list of values and keys. +kernel.sysrq = 16 + +# Append the PID to the core filename +kernel.core_uses_pid = 1 + +# Source route verification +net.ipv4.conf.default.rp_filter = 1 +net.ipv4.conf.all.rp_filter = 1 + +# Do not accept source routing +net.ipv4.conf.default.accept_source_route = 0 +net.ipv4.conf.all.accept_source_route = 0 + +# Promote secondary addresses when the primary address is removed +net.ipv4.conf.default.promote_secondaries = 1 +net.ipv4.conf.all.promote_secondaries = 1 + +# Fair Queue CoDel packet scheduler to fight bufferbloat +net.core.default_qdisc = fq_codel + +# Enable hard and soft link protection +fs.protected_hardlinks = 1 +fs.protected_symlinks = 1 diff --git a/src/grp-initprogs/systemd-sysctl/Makefile b/src/grp-initprogs/systemd-sysctl/Makefile new file mode 100644 index 0000000000..3af80e7bef --- /dev/null +++ b/src/grp-initprogs/systemd-sysctl/Makefile @@ -0,0 +1,33 @@ +# -*- Mode: makefile; indent-tabs-mode: t -*- +# +# This file is part of systemd. +# +# Copyright 2010-2012 Lennart Poettering +# Copyright 2010-2012 Kay Sievers +# Copyright 2013 Zbigniew Jędrzejewski-Szmek +# Copyright 2013 David Strauss +# Copyright 2016 Luke Shumaker +# +# systemd is free software; you can redistribute it and/or modify it +# under the terms of the GNU Lesser General Public License as published by +# the Free Software Foundation; either version 2.1 of the License, or +# (at your option) any later version. +# +# systemd is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public License +# along with systemd; If not, see <http://www.gnu.org/licenses/>. +include $(dir $(lastword $(MAKEFILE_LIST)))/../../../config.mk +include $(topsrcdir)/build-aux/Makefile.head.mk + +rootlibexec_PROGRAMS += systemd-sysctl +systemd_sysctl_SOURCES = \ + src/sysctl/sysctl.c + +systemd_sysctl_LDADD = \ + libshared.la + +include $(topsrcdir)/build-aux/Makefile.tail.mk diff --git a/src/grp-initprogs/systemd-sysctl/sysctl.c b/src/grp-initprogs/systemd-sysctl/sysctl.c new file mode 100644 index 0000000000..c44aa0aabb --- /dev/null +++ b/src/grp-initprogs/systemd-sysctl/sysctl.c @@ -0,0 +1,287 @@ +/*** + This file is part of systemd. + + Copyright 2010 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <errno.h> +#include <getopt.h> +#include <limits.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "basic/conf-files.h" +#include "basic/def.h" +#include "basic/fd-util.h" +#include "basic/fileio.h" +#include "basic/hashmap.h" +#include "basic/log.h" +#include "basic/path-util.h" +#include "basic/string-util.h" +#include "basic/strv.h" +#include "basic/util.h" +#include "shared/sysctl-util.h" + +static char **arg_prefixes = NULL; + +static const char conf_file_dirs[] = CONF_PATHS_NULSTR("sysctl.d"); + +static int apply_all(Hashmap *sysctl_options) { + char *property, *value; + Iterator i; + int r = 0; + + HASHMAP_FOREACH_KEY(value, property, sysctl_options, i) { + int k; + + k = sysctl_write(property, value); + if (k < 0) { + log_full_errno(k == -ENOENT ? LOG_INFO : LOG_WARNING, k, + "Couldn't write '%s' to '%s', ignoring: %m", value, property); + + if (r == 0 && k != -ENOENT) + r = k; + } + } + + return r; +} + +static int parse_file(Hashmap *sysctl_options, const char *path, bool ignore_enoent) { + _cleanup_fclose_ FILE *f = NULL; + int r; + + assert(path); + + r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &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); + while (!feof(f)) { + char l[LINE_MAX], *p, *value, *new_value, *property, *existing; + void *v; + int k; + + if (!fgets(l, sizeof(l), f)) { + if (feof(f)) + break; + + return log_error_errno(errno, "Failed to read file '%s', ignoring: %m", path); + } + + p = strstrip(l); + if (!*p) + continue; + + if (strchr(COMMENTS "\n", *p)) + continue; + + value = strchr(p, '='); + if (!value) { + log_error("Line is not an assignment in file '%s': %s", path, value); + + if (r == 0) + r = -EINVAL; + continue; + } + + *value = 0; + value++; + + p = sysctl_normalize(strstrip(p)); + value = strstrip(value); + + if (!strv_isempty(arg_prefixes)) { + char **i, *t; + STRV_FOREACH(i, arg_prefixes) { + t = path_startswith(*i, "/proc/sys/"); + if (t == NULL) + t = *i; + if (path_startswith(p, t)) + goto found; + } + /* not found */ + continue; + } + +found: + existing = hashmap_get2(sysctl_options, p, &v); + if (existing) { + if (streq(value, existing)) + continue; + + log_debug("Overwriting earlier assignment of %s in file '%s'.", p, path); + free(hashmap_remove(sysctl_options, p)); + free(v); + } + + property = strdup(p); + if (!property) + return log_oom(); + + new_value = strdup(value); + if (!new_value) { + free(property); + return log_oom(); + } + + k = hashmap_put(sysctl_options, property, new_value); + if (k < 0) { + log_error_errno(k, "Failed to add sysctl variable %s to hashmap: %m", property); + free(property); + free(new_value); + return k; + } + } + + return r; +} + +static void help(void) { + printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" + "Applies kernel sysctl settings.\n\n" + " -h --help Show this help\n" + " --version Show package version\n" + " --prefix=PATH Only apply rules with the specified prefix\n" + , program_invocation_short_name); +} + +static int parse_argv(int argc, char *argv[]) { + + enum { + ARG_VERSION = 0x100, + ARG_PREFIX + }; + + static const struct option options[] = { + { "help", no_argument, NULL, 'h' }, + { "version", no_argument, NULL, ARG_VERSION }, + { "prefix", required_argument, NULL, ARG_PREFIX }, + {} + }; + + int c; + + assert(argc >= 0); + assert(argv); + + while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) + + switch (c) { + + case 'h': + help(); + return 0; + + case ARG_VERSION: + return version(); + + 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 (startswith(optarg, "/proc/sys")) + p = strdup(optarg); + else + p = strappend("/proc/sys/", optarg); + if (!p) + return log_oom(); + + if (strv_consume(&arg_prefixes, p) < 0) + return log_oom(); + + break; + } + + case '?': + return -EINVAL; + + default: + assert_not_reached("Unhandled option"); + } + + return 1; +} + +int main(int argc, char *argv[]) { + int r = 0, k; + Hashmap *sysctl_options; + + r = parse_argv(argc, argv); + if (r <= 0) + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; + + log_set_target(LOG_TARGET_AUTO); + log_parse_environment(); + log_open(); + + umask(0022); + + sysctl_options = hashmap_new(&string_hash_ops); + if (!sysctl_options) { + r = log_oom(); + goto finish; + } + + r = 0; + + if (argc > optind) { + int i; + + 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_nulstr(&files, ".conf", NULL, conf_file_dirs); + if (r < 0) { + log_error_errno(r, "Failed to enumerate sysctl.d files: %m"); + goto finish; + } + + 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; + +finish: + hashmap_free_free_free(sysctl_options); + strv_free(arg_prefixes); + + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; +} diff --git a/src/grp-initprogs/systemd-sysctl/systemd-sysctl.service.in b/src/grp-initprogs/systemd-sysctl/systemd-sysctl.service.in new file mode 100644 index 0000000000..d784c6426d --- /dev/null +++ b/src/grp-initprogs/systemd-sysctl/systemd-sysctl.service.in @@ -0,0 +1,21 @@ +# This file is part of systemd. +# +# systemd is free software; you can redistribute it and/or modify it +# under the terms of the GNU Lesser General Public License as published by +# the Free Software Foundation; either version 2.1 of the License, or +# (at your option) any later version. + +[Unit] +Description=Apply Kernel Variables +Documentation=man:systemd-sysctl.service(8) man:sysctl.d(5) +DefaultDependencies=no +Conflicts=shutdown.target +After=systemd-modules-load.service +Before=sysinit.target shutdown.target +ConditionPathIsReadWrite=/proc/sys/ + +[Service] +Type=oneshot +RemainAfterExit=yes +ExecStart=@rootlibexecdir@/systemd-sysctl +TimeoutSec=90s |