Fork of Original Code Base: anongit.freedesktop.org/systemd

This is the initial fork of the code base from freedsktop.org.
The code is provided here as a reference of the initial starting
point and for possible future checkouts after a large portion
of this code is removed.

Merge git://anongit.freedesktop.org/systemd/systemd

1 files changed, 336 insertions, 0 deletions

diff --git a/src/sysctl/sysctl.c b/src/sysctl/sysctl.c
new file mode 100644
index 0000000000..035e0ec321
--- /dev/null
+++ b/src/sysctl/sysctl.c
@@ -0,0 +1,336 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  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 <stdlib.h>
+#include <stdbool.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <limits.h>
+#include <getopt.h>
+
+#include "log.h"
+#include "strv.h"
+#include "util.h"
+#include "strv.h"
+#include "hashmap.h"
+#include "path-util.h"
+#include "conf-files.h"
+
+#define PROC_SYS_PREFIX "/proc/sys/"
+
+static char **arg_prefixes;
+static Hashmap *sysctl_options;
+
+static int apply_sysctl(const char *property, const char *value) {
+        char *p, *n;
+        int r = 0, k;
+
+        log_debug("Setting '%s' to '%s'", property, value);
+
+        p = new(char, sizeof(PROC_SYS_PREFIX) + strlen(property));
+        if (!p)
+                return log_oom();
+
+        n = stpcpy(p, PROC_SYS_PREFIX);
+        strcpy(n, property);
+
+        for (; *n; n++)
+                if (*n == '.')
+                        *n = '/';
+
+        if (!strv_isempty(arg_prefixes)) {
+                char **i;
+                bool good = false;
+
+                STRV_FOREACH(i, arg_prefixes)
+                        if (path_startswith(p, *i)) {
+                                good = true;
+                                break;
+                        }
+
+                if (!good) {
+                        log_debug("Skipping %s", p);
+                        free(p);
+                        return 0;
+                }
+        }
+
+        k = write_one_line_file(p, value);
+        if (k < 0) {
+
+                log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING,
+                         "Failed to write '%s' to '%s': %s", value, p, strerror(-k));
+
+                if (k != -ENOENT && r == 0)
+                        r = k;
+        }
+
+        free(p);
+
+        return r;
+}
+
+static int apply_all(void) {
+        int r = 0;
+        char *property, *value;
+        Iterator i;
+
+        HASHMAP_FOREACH_KEY(value, property, sysctl_options, i) {
+                int k;
+
+                k = apply_sysctl(property, value);
+                if (k < 0 && r == 0)
+                        r = k;
+        }
+        return r;
+}
+
+static int parse_file(const char *path, bool ignore_enoent) {
+        FILE *f;
+        int r = 0;
+
+        assert(path);
+
+        f = fopen(path, "re");
+        if (!f) {
+                if (ignore_enoent && errno == ENOENT)
+                        return 0;
+
+                log_error("Failed to open file '%s', ignoring: %m", path);
+                return -errno;
+        }
+
+        log_debug("parse: %s\n", path);
+        while (!feof(f)) {
+                char l[LINE_MAX], *p, *value, *new_value, *property;
+
+                if (!fgets(l, sizeof(l), f)) {
+                        if (feof(f))
+                                break;
+
+                        log_error("Failed to read file '%s', ignoring: %m", path);
+                        r = -errno;
+                        goto finish;
+                }
+
+                p = strstrip(l);
+
+                if (!*p)
+                        continue;
+
+                if (strchr(COMMENTS, *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++;
+
+                property = strdup(strstrip(p));
+                if (!property) {
+                        r = log_oom();
+                        goto finish;
+                }
+
+                new_value = strdup(strstrip(value));
+                if (!new_value) {
+                        free(property);
+                        r = log_oom();
+                        goto finish;
+                }
+
+                r = hashmap_put(sysctl_options, property, new_value);
+                if (r < 0) {
+                        if (r == -EEXIST) {
+                                /* ignore this "error" to avoid returning it
+                                 * for the function when this is the last key
+                                 * in the file being parsed. */
+                                r = 0;
+                                log_debug("Skipping previously assigned sysctl variable %s", property);
+                        } else
+                                log_error("Failed to add sysctl variable %s to hashmap: %s", property, strerror(-r));
+
+                        free(property);
+                        free(new_value);
+                        if (r != 0)
+                                goto finish;
+                }
+        }
+
+finish:
+        fclose(f);
+
+        return r;
+}
+
+static int help(void) {
+
+        printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
+               "Applies kernel sysctl settings.\n\n"
+               "  -h --help             Show this help\n"
+               "     --prefix=PATH      Only apply rules that apply to paths with the specified prefix\n",
+               program_invocation_short_name);
+
+        return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+        enum {
+                ARG_PREFIX
+        };
+
+        static const struct option options[] = {
+                { "help",      no_argument,       NULL, 'h'           },
+                { "prefix",    required_argument, NULL, ARG_PREFIX    },
+                { NULL,        0,                 NULL, 0             }
+        };
+
+        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_PREFIX: {
+                        char *p;
+                        char **l;
+
+                        for (p = optarg; *p; p++)
+                                if (*p == '.')
+                                        *p = '/';
+
+                        l = strv_append(arg_prefixes, optarg);
+                        if (!l)
+                                return log_oom();
+
+                        strv_free(arg_prefixes);
+                        arg_prefixes = l;
+
+                        break;
+                }
+
+                case '?':
+                        return -EINVAL;
+
+                default:
+                        log_error("Unknown option code %c", c);
+                        return -EINVAL;
+                }
+        }
+
+        return 1;
+}
+
+int main(int argc, char *argv[]) {
+        int r = 0, k;
+        char *property, *value;
+        Iterator it;
+
+        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_func, string_compare_func);
+        if (!sysctl_options) {
+                r = log_oom();
+                goto finish;
+        }
+
+        r = 0;
+
+        if (argc > optind) {
+                int i;
+
+                for (i = optind; i < argc; i++) {
+                        k = parse_file(argv[i], false);
+                        if (k < 0)
+                                r = k;
+                }
+        } else {
+                char **files, **f;
+
+                r = conf_files_list(&files, ".conf",
+                                    "/etc/sysctl.d",
+                                    "/run/sysctl.d",
+                                    "/usr/local/lib/sysctl.d",
+                                    "/usr/lib/sysctl.d",
+#ifdef HAVE_SPLIT_USR
+                                    "/lib/sysctl.d",
+#endif
+                                    NULL);
+                if (r < 0) {
+                        log_error("Failed to enumerate sysctl.d files: %s", strerror(-r));
+                        goto finish;
+                }
+
+                /* We parse the files in decreasing order of precedence.
+                 * parse_file() will skip keys that were already assigned. */
+
+                r = parse_file("/etc/sysctl.conf", true);
+
+                f = files + strv_length(files) - 1;
+                STRV_FOREACH_BACKWARDS(f, files) {
+                        k = parse_file(*f, true);
+                        if (k < 0)
+                                r = k;
+                }
+
+                strv_free(files);
+        }
+
+        k = apply_all();
+        if (k < 0)
+                r = k;
+
+finish:
+        HASHMAP_FOREACH_KEY(value, property, sysctl_options, it) {
+                hashmap_remove(sysctl_options, property);
+                free(property);
+                free(value);
+        }
+        hashmap_free(sysctl_options);
+
+        strv_free(arg_prefixes);
+
+        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}