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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" |
9eb977db | 34 | #include "path-util.h" |
2c21044f | 35 | #include "conf-files.h" |
8e1bd70d LP |
36 | |
37 | #define PROC_SYS_PREFIX "/proc/sys/" | |
38 | ||
f68c5a70 | 39 | static char **arg_prefixes = NULL; |
7a2a0b90 | 40 | |
c1b664d0 | 41 | static int apply_sysctl(const char *property, const char *value) { |
8e1bd70d | 42 | char *p, *n; |
c1b664d0 | 43 | int r = 0, k; |
8e1bd70d LP |
44 | |
45 | log_debug("Setting '%s' to '%s'", property, value); | |
46 | ||
7a2a0b90 LP |
47 | p = new(char, sizeof(PROC_SYS_PREFIX) + strlen(property)); |
48 | if (!p) { | |
669241a0 | 49 | log_error("Out of memory."); |
c1b664d0 | 50 | return -ENOMEM; |
8e1bd70d LP |
51 | } |
52 | ||
53 | n = stpcpy(p, PROC_SYS_PREFIX); | |
54 | strcpy(n, property); | |
55 | ||
56 | for (; *n; n++) | |
57 | if (*n == '.') | |
58 | *n = '/'; | |
59 | ||
f68c5a70 LP |
60 | if (!strv_isempty(arg_prefixes)) { |
61 | char **i; | |
62 | bool good = false; | |
63 | ||
64 | STRV_FOREACH(i, arg_prefixes) | |
65 | if (path_startswith(p, *i)) { | |
66 | good = true; | |
67 | break; | |
68 | } | |
69 | ||
70 | if (!good) { | |
71 | log_debug("Skipping %s", p); | |
72 | free(p); | |
73 | return 0; | |
74 | } | |
7a2a0b90 LP |
75 | } |
76 | ||
77 | k = write_one_line_file(p, value); | |
78 | if (k < 0) { | |
5707631e | 79 | |
c1b664d0 LP |
80 | log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING, |
81 | "Failed to write '%s' to '%s': %s", value, p, strerror(-k)); | |
24a35973 | 82 | |
c1b664d0 LP |
83 | if (k != -ENOENT && r == 0) |
84 | r = k; | |
8e1bd70d LP |
85 | } |
86 | ||
87 | free(p); | |
c1b664d0 LP |
88 | |
89 | return r; | |
8e1bd70d LP |
90 | } |
91 | ||
c1b664d0 | 92 | static int apply_file(const char *path, bool ignore_enoent) { |
8e1bd70d | 93 | FILE *f; |
c1b664d0 | 94 | int r = 0; |
8e1bd70d LP |
95 | |
96 | assert(path); | |
97 | ||
98 | if (!(f = fopen(path, "re"))) { | |
c1b664d0 LP |
99 | if (ignore_enoent && errno == ENOENT) |
100 | return 0; | |
101 | ||
8e1bd70d | 102 | log_error("Failed to open file '%s', ignoring: %m", path); |
c1b664d0 | 103 | return -errno; |
8e1bd70d LP |
104 | } |
105 | ||
db1413d7 | 106 | log_debug("apply: %s\n", path); |
8e1bd70d LP |
107 | while (!feof(f)) { |
108 | char l[LINE_MAX], *p, *value; | |
c1b664d0 | 109 | int k; |
8e1bd70d LP |
110 | |
111 | if (!fgets(l, sizeof(l), f)) { | |
112 | if (feof(f)) | |
113 | break; | |
114 | ||
115 | log_error("Failed to read file '%s', ignoring: %m", path); | |
c1b664d0 | 116 | r = -errno; |
8e1bd70d LP |
117 | goto finish; |
118 | } | |
119 | ||
120 | p = strstrip(l); | |
121 | ||
122 | if (!*p) | |
123 | continue; | |
124 | ||
125 | if (strchr(COMMENTS, *p)) | |
126 | continue; | |
127 | ||
128 | if (!(value = strchr(p, '='))) { | |
129 | log_error("Line is not an assignment in file '%s': %s", path, value); | |
c1b664d0 LP |
130 | |
131 | if (r == 0) | |
132 | r = -EINVAL; | |
8e1bd70d LP |
133 | continue; |
134 | } | |
135 | ||
136 | *value = 0; | |
137 | value++; | |
138 | ||
c1b664d0 LP |
139 | if ((k = apply_sysctl(strstrip(p), strstrip(value))) < 0 && r == 0) |
140 | r = k; | |
8e1bd70d LP |
141 | } |
142 | ||
143 | finish: | |
144 | fclose(f); | |
c1b664d0 LP |
145 | |
146 | return r; | |
8e1bd70d LP |
147 | } |
148 | ||
7a2a0b90 LP |
149 | static int help(void) { |
150 | ||
151 | printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" | |
152 | "Applies kernel sysctl settings.\n\n" | |
153 | " -h --help Show this help\n" | |
154 | " --prefix=PATH Only apply rules that apply to paths with the specified prefix\n", | |
155 | program_invocation_short_name); | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | static int parse_argv(int argc, char *argv[]) { | |
161 | ||
162 | enum { | |
163 | ARG_PREFIX | |
164 | }; | |
165 | ||
166 | static const struct option options[] = { | |
167 | { "help", no_argument, NULL, 'h' }, | |
168 | { "prefix", required_argument, NULL, ARG_PREFIX }, | |
169 | { NULL, 0, NULL, 0 } | |
170 | }; | |
171 | ||
172 | int c; | |
173 | ||
174 | assert(argc >= 0); | |
175 | assert(argv); | |
176 | ||
177 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) { | |
178 | ||
179 | switch (c) { | |
180 | ||
181 | case 'h': | |
182 | help(); | |
183 | return 0; | |
184 | ||
185 | case ARG_PREFIX: { | |
186 | char *p; | |
f68c5a70 | 187 | char **l; |
7a2a0b90 LP |
188 | |
189 | for (p = optarg; *p; p++) | |
190 | if (*p == '.') | |
191 | *p = '/'; | |
192 | ||
f68c5a70 LP |
193 | l = strv_append(arg_prefixes, optarg); |
194 | if (!l) { | |
669241a0 | 195 | log_error("Out of memory."); |
f68c5a70 LP |
196 | return -ENOMEM; |
197 | } | |
198 | ||
199 | strv_free(arg_prefixes); | |
200 | arg_prefixes = l; | |
7a2a0b90 LP |
201 | |
202 | break; | |
203 | } | |
204 | ||
205 | case '?': | |
206 | return -EINVAL; | |
207 | ||
208 | default: | |
209 | log_error("Unknown option code %c", c); | |
210 | return -EINVAL; | |
211 | } | |
212 | } | |
213 | ||
214 | return 1; | |
215 | } | |
216 | ||
8e1bd70d | 217 | int main(int argc, char *argv[]) { |
c1b664d0 | 218 | int r = 0; |
8e1bd70d | 219 | |
7a2a0b90 LP |
220 | r = parse_argv(argc, argv); |
221 | if (r <= 0) | |
222 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
223 | ||
8e1bd70d LP |
224 | log_set_target(LOG_TARGET_AUTO); |
225 | log_parse_environment(); | |
226 | log_open(); | |
227 | ||
4c12626c LP |
228 | umask(0022); |
229 | ||
de19ece7 LP |
230 | if (argc > optind) { |
231 | int i; | |
232 | ||
233 | for (i = optind; i < argc; i++) { | |
234 | int k; | |
235 | ||
236 | k = apply_file(argv[i], false); | |
237 | if (k < 0 && r == 0) | |
238 | r = k; | |
239 | } | |
240 | } else { | |
db1413d7 | 241 | char **files, **f; |
de19ece7 | 242 | int k; |
c1b664d0 | 243 | |
44143309 | 244 | r = conf_files_list(&files, ".conf", |
44143309 | 245 | "/etc/sysctl.d", |
fc1a2e06 | 246 | "/run/sysctl.d", |
40013ebc | 247 | "/usr/local/lib/sysctl.d", |
44143309 | 248 | "/usr/lib/sysctl.d", |
de19ece7 | 249 | #ifdef HAVE_SPLIT_USR |
223a3558 | 250 | "/lib/sysctl.d", |
de19ece7 | 251 | #endif |
44143309 KS |
252 | NULL); |
253 | if (r < 0) { | |
254 | log_error("Failed to enumerate sysctl.d files: %s", strerror(-r)); | |
255 | goto finish; | |
256 | } | |
db1413d7 KS |
257 | |
258 | STRV_FOREACH(f, files) { | |
db1413d7 KS |
259 | k = apply_file(*f, true); |
260 | if (k < 0 && r == 0) | |
261 | r = k; | |
262 | } | |
263 | ||
de19ece7 LP |
264 | k = apply_file("/etc/sysctl.conf", true); |
265 | if (k < 0 && r == 0) | |
266 | r = k; | |
cb804011 | 267 | |
db1413d7 | 268 | strv_free(files); |
8e1bd70d | 269 | } |
44143309 | 270 | finish: |
f68c5a70 LP |
271 | strv_free(arg_prefixes); |
272 | ||
c1b664d0 | 273 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
8e1bd70d | 274 | } |