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8e1bd70d LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
8e1bd70d LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
8e1bd70d | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
8e1bd70d LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <stdlib.h> | |
23 | #include <stdbool.h> | |
24 | #include <errno.h> | |
25 | #include <string.h> | |
8e1bd70d LP |
26 | #include <stdio.h> |
27 | #include <limits.h> | |
7a2a0b90 | 28 | #include <getopt.h> |
8e1bd70d LP |
29 | |
30 | #include "log.h" | |
db1413d7 | 31 | #include "strv.h" |
8e1bd70d | 32 | #include "util.h" |
f68c5a70 | 33 | #include "strv.h" |
2c21044f | 34 | #include "conf-files.h" |
8e1bd70d LP |
35 | |
36 | #define PROC_SYS_PREFIX "/proc/sys/" | |
37 | ||
f68c5a70 | 38 | static char **arg_prefixes = NULL; |
7a2a0b90 | 39 | |
c1b664d0 | 40 | static int apply_sysctl(const char *property, const char *value) { |
8e1bd70d | 41 | char *p, *n; |
c1b664d0 | 42 | int r = 0, k; |
8e1bd70d LP |
43 | |
44 | log_debug("Setting '%s' to '%s'", property, value); | |
45 | ||
7a2a0b90 LP |
46 | p = new(char, sizeof(PROC_SYS_PREFIX) + strlen(property)); |
47 | if (!p) { | |
8e1bd70d | 48 | log_error("Out of memory"); |
c1b664d0 | 49 | return -ENOMEM; |
8e1bd70d LP |
50 | } |
51 | ||
52 | n = stpcpy(p, PROC_SYS_PREFIX); | |
53 | strcpy(n, property); | |
54 | ||
55 | for (; *n; n++) | |
56 | if (*n == '.') | |
57 | *n = '/'; | |
58 | ||
f68c5a70 LP |
59 | if (!strv_isempty(arg_prefixes)) { |
60 | char **i; | |
61 | bool good = false; | |
62 | ||
63 | STRV_FOREACH(i, arg_prefixes) | |
64 | if (path_startswith(p, *i)) { | |
65 | good = true; | |
66 | break; | |
67 | } | |
68 | ||
69 | if (!good) { | |
70 | log_debug("Skipping %s", p); | |
71 | free(p); | |
72 | return 0; | |
73 | } | |
7a2a0b90 LP |
74 | } |
75 | ||
76 | k = write_one_line_file(p, value); | |
77 | if (k < 0) { | |
5707631e | 78 | |
c1b664d0 LP |
79 | log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING, |
80 | "Failed to write '%s' to '%s': %s", value, p, strerror(-k)); | |
24a35973 | 81 | |
c1b664d0 LP |
82 | if (k != -ENOENT && r == 0) |
83 | r = k; | |
8e1bd70d LP |
84 | } |
85 | ||
86 | free(p); | |
c1b664d0 LP |
87 | |
88 | return r; | |
8e1bd70d LP |
89 | } |
90 | ||
c1b664d0 | 91 | static int apply_file(const char *path, bool ignore_enoent) { |
8e1bd70d | 92 | FILE *f; |
c1b664d0 | 93 | int r = 0; |
8e1bd70d LP |
94 | |
95 | assert(path); | |
96 | ||
97 | if (!(f = fopen(path, "re"))) { | |
c1b664d0 LP |
98 | if (ignore_enoent && errno == ENOENT) |
99 | return 0; | |
100 | ||
8e1bd70d | 101 | log_error("Failed to open file '%s', ignoring: %m", path); |
c1b664d0 | 102 | return -errno; |
8e1bd70d LP |
103 | } |
104 | ||
db1413d7 | 105 | log_debug("apply: %s\n", path); |
8e1bd70d LP |
106 | while (!feof(f)) { |
107 | char l[LINE_MAX], *p, *value; | |
c1b664d0 | 108 | int k; |
8e1bd70d LP |
109 | |
110 | if (!fgets(l, sizeof(l), f)) { | |
111 | if (feof(f)) | |
112 | break; | |
113 | ||
114 | log_error("Failed to read file '%s', ignoring: %m", path); | |
c1b664d0 | 115 | r = -errno; |
8e1bd70d LP |
116 | goto finish; |
117 | } | |
118 | ||
119 | p = strstrip(l); | |
120 | ||
121 | if (!*p) | |
122 | continue; | |
123 | ||
124 | if (strchr(COMMENTS, *p)) | |
125 | continue; | |
126 | ||
127 | if (!(value = strchr(p, '='))) { | |
128 | log_error("Line is not an assignment in file '%s': %s", path, value); | |
c1b664d0 LP |
129 | |
130 | if (r == 0) | |
131 | r = -EINVAL; | |
8e1bd70d LP |
132 | continue; |
133 | } | |
134 | ||
135 | *value = 0; | |
136 | value++; | |
137 | ||
c1b664d0 LP |
138 | if ((k = apply_sysctl(strstrip(p), strstrip(value))) < 0 && r == 0) |
139 | r = k; | |
8e1bd70d LP |
140 | } |
141 | ||
142 | finish: | |
143 | fclose(f); | |
c1b664d0 LP |
144 | |
145 | return r; | |
8e1bd70d LP |
146 | } |
147 | ||
7a2a0b90 LP |
148 | static int help(void) { |
149 | ||
150 | printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" | |
151 | "Applies kernel sysctl settings.\n\n" | |
152 | " -h --help Show this help\n" | |
153 | " --prefix=PATH Only apply rules that apply to paths with the specified prefix\n", | |
154 | program_invocation_short_name); | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
159 | static int parse_argv(int argc, char *argv[]) { | |
160 | ||
161 | enum { | |
162 | ARG_PREFIX | |
163 | }; | |
164 | ||
165 | static const struct option options[] = { | |
166 | { "help", no_argument, NULL, 'h' }, | |
167 | { "prefix", required_argument, NULL, ARG_PREFIX }, | |
168 | { NULL, 0, NULL, 0 } | |
169 | }; | |
170 | ||
171 | int c; | |
172 | ||
173 | assert(argc >= 0); | |
174 | assert(argv); | |
175 | ||
176 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) { | |
177 | ||
178 | switch (c) { | |
179 | ||
180 | case 'h': | |
181 | help(); | |
182 | return 0; | |
183 | ||
184 | case ARG_PREFIX: { | |
185 | char *p; | |
f68c5a70 | 186 | char **l; |
7a2a0b90 LP |
187 | |
188 | for (p = optarg; *p; p++) | |
189 | if (*p == '.') | |
190 | *p = '/'; | |
191 | ||
f68c5a70 LP |
192 | l = strv_append(arg_prefixes, optarg); |
193 | if (!l) { | |
194 | log_error("Out of memory"); | |
195 | return -ENOMEM; | |
196 | } | |
197 | ||
198 | strv_free(arg_prefixes); | |
199 | arg_prefixes = l; | |
7a2a0b90 LP |
200 | |
201 | break; | |
202 | } | |
203 | ||
204 | case '?': | |
205 | return -EINVAL; | |
206 | ||
207 | default: | |
208 | log_error("Unknown option code %c", c); | |
209 | return -EINVAL; | |
210 | } | |
211 | } | |
212 | ||
213 | return 1; | |
214 | } | |
215 | ||
8e1bd70d | 216 | int main(int argc, char *argv[]) { |
c1b664d0 | 217 | int r = 0; |
8e1bd70d | 218 | |
7a2a0b90 LP |
219 | r = parse_argv(argc, argv); |
220 | if (r <= 0) | |
221 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
222 | ||
8e1bd70d LP |
223 | log_set_target(LOG_TARGET_AUTO); |
224 | log_parse_environment(); | |
225 | log_open(); | |
226 | ||
4c12626c LP |
227 | umask(0022); |
228 | ||
de19ece7 LP |
229 | if (argc > optind) { |
230 | int i; | |
231 | ||
232 | for (i = optind; i < argc; i++) { | |
233 | int k; | |
234 | ||
235 | k = apply_file(argv[i], false); | |
236 | if (k < 0 && r == 0) | |
237 | r = k; | |
238 | } | |
239 | } else { | |
db1413d7 | 240 | char **files, **f; |
de19ece7 | 241 | int k; |
c1b664d0 | 242 | |
44143309 | 243 | r = conf_files_list(&files, ".conf", |
44143309 | 244 | "/etc/sysctl.d", |
fc1a2e06 | 245 | "/run/sysctl.d", |
40013ebc | 246 | "/usr/local/lib/sysctl.d", |
44143309 | 247 | "/usr/lib/sysctl.d", |
de19ece7 | 248 | #ifdef HAVE_SPLIT_USR |
223a3558 | 249 | "/lib/sysctl.d", |
de19ece7 | 250 | #endif |
44143309 KS |
251 | NULL); |
252 | if (r < 0) { | |
253 | log_error("Failed to enumerate sysctl.d files: %s", strerror(-r)); | |
254 | goto finish; | |
255 | } | |
db1413d7 KS |
256 | |
257 | STRV_FOREACH(f, files) { | |
db1413d7 KS |
258 | k = apply_file(*f, true); |
259 | if (k < 0 && r == 0) | |
260 | r = k; | |
261 | } | |
262 | ||
de19ece7 LP |
263 | k = apply_file("/etc/sysctl.conf", true); |
264 | if (k < 0 && r == 0) | |
265 | r = k; | |
cb804011 | 266 | |
db1413d7 | 267 | strv_free(files); |
8e1bd70d | 268 | } |
44143309 | 269 | finish: |
f68c5a70 LP |
270 | strv_free(arg_prefixes); |
271 | ||
c1b664d0 | 272 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
8e1bd70d | 273 | } |