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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 | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
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" |
8e1bd70d LP |
34 | |
35 | #define PROC_SYS_PREFIX "/proc/sys/" | |
36 | ||
f68c5a70 | 37 | static char **arg_prefixes = NULL; |
7a2a0b90 | 38 | |
c1b664d0 | 39 | static int apply_sysctl(const char *property, const char *value) { |
8e1bd70d | 40 | char *p, *n; |
c1b664d0 | 41 | int r = 0, k; |
8e1bd70d LP |
42 | |
43 | log_debug("Setting '%s' to '%s'", property, value); | |
44 | ||
7a2a0b90 LP |
45 | p = new(char, sizeof(PROC_SYS_PREFIX) + strlen(property)); |
46 | if (!p) { | |
8e1bd70d | 47 | log_error("Out of memory"); |
c1b664d0 | 48 | return -ENOMEM; |
8e1bd70d LP |
49 | } |
50 | ||
51 | n = stpcpy(p, PROC_SYS_PREFIX); | |
52 | strcpy(n, property); | |
53 | ||
54 | for (; *n; n++) | |
55 | if (*n == '.') | |
56 | *n = '/'; | |
57 | ||
f68c5a70 LP |
58 | if (!strv_isempty(arg_prefixes)) { |
59 | char **i; | |
60 | bool good = false; | |
61 | ||
62 | STRV_FOREACH(i, arg_prefixes) | |
63 | if (path_startswith(p, *i)) { | |
64 | good = true; | |
65 | break; | |
66 | } | |
67 | ||
68 | if (!good) { | |
69 | log_debug("Skipping %s", p); | |
70 | free(p); | |
71 | return 0; | |
72 | } | |
7a2a0b90 LP |
73 | } |
74 | ||
75 | k = write_one_line_file(p, value); | |
76 | if (k < 0) { | |
5707631e | 77 | |
c1b664d0 LP |
78 | log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING, |
79 | "Failed to write '%s' to '%s': %s", value, p, strerror(-k)); | |
24a35973 | 80 | |
c1b664d0 LP |
81 | if (k != -ENOENT && r == 0) |
82 | r = k; | |
8e1bd70d LP |
83 | } |
84 | ||
85 | free(p); | |
c1b664d0 LP |
86 | |
87 | return r; | |
8e1bd70d LP |
88 | } |
89 | ||
c1b664d0 | 90 | static int apply_file(const char *path, bool ignore_enoent) { |
8e1bd70d | 91 | FILE *f; |
c1b664d0 | 92 | int r = 0; |
8e1bd70d LP |
93 | |
94 | assert(path); | |
95 | ||
96 | if (!(f = fopen(path, "re"))) { | |
c1b664d0 LP |
97 | if (ignore_enoent && errno == ENOENT) |
98 | return 0; | |
99 | ||
8e1bd70d | 100 | log_error("Failed to open file '%s', ignoring: %m", path); |
c1b664d0 | 101 | return -errno; |
8e1bd70d LP |
102 | } |
103 | ||
db1413d7 | 104 | log_debug("apply: %s\n", path); |
8e1bd70d LP |
105 | while (!feof(f)) { |
106 | char l[LINE_MAX], *p, *value; | |
c1b664d0 | 107 | int k; |
8e1bd70d LP |
108 | |
109 | if (!fgets(l, sizeof(l), f)) { | |
110 | if (feof(f)) | |
111 | break; | |
112 | ||
113 | log_error("Failed to read file '%s', ignoring: %m", path); | |
c1b664d0 | 114 | r = -errno; |
8e1bd70d LP |
115 | goto finish; |
116 | } | |
117 | ||
118 | p = strstrip(l); | |
119 | ||
120 | if (!*p) | |
121 | continue; | |
122 | ||
123 | if (strchr(COMMENTS, *p)) | |
124 | continue; | |
125 | ||
126 | if (!(value = strchr(p, '='))) { | |
127 | log_error("Line is not an assignment in file '%s': %s", path, value); | |
c1b664d0 LP |
128 | |
129 | if (r == 0) | |
130 | r = -EINVAL; | |
8e1bd70d LP |
131 | continue; |
132 | } | |
133 | ||
134 | *value = 0; | |
135 | value++; | |
136 | ||
c1b664d0 LP |
137 | if ((k = apply_sysctl(strstrip(p), strstrip(value))) < 0 && r == 0) |
138 | r = k; | |
8e1bd70d LP |
139 | } |
140 | ||
141 | finish: | |
142 | fclose(f); | |
c1b664d0 LP |
143 | |
144 | return r; | |
8e1bd70d LP |
145 | } |
146 | ||
7a2a0b90 LP |
147 | static int help(void) { |
148 | ||
149 | printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" | |
150 | "Applies kernel sysctl settings.\n\n" | |
151 | " -h --help Show this help\n" | |
152 | " --prefix=PATH Only apply rules that apply to paths with the specified prefix\n", | |
153 | program_invocation_short_name); | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | static int parse_argv(int argc, char *argv[]) { | |
159 | ||
160 | enum { | |
161 | ARG_PREFIX | |
162 | }; | |
163 | ||
164 | static const struct option options[] = { | |
165 | { "help", no_argument, NULL, 'h' }, | |
166 | { "prefix", required_argument, NULL, ARG_PREFIX }, | |
167 | { NULL, 0, NULL, 0 } | |
168 | }; | |
169 | ||
170 | int c; | |
171 | ||
172 | assert(argc >= 0); | |
173 | assert(argv); | |
174 | ||
175 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) { | |
176 | ||
177 | switch (c) { | |
178 | ||
179 | case 'h': | |
180 | help(); | |
181 | return 0; | |
182 | ||
183 | case ARG_PREFIX: { | |
184 | char *p; | |
f68c5a70 | 185 | char **l; |
7a2a0b90 LP |
186 | |
187 | for (p = optarg; *p; p++) | |
188 | if (*p == '.') | |
189 | *p = '/'; | |
190 | ||
f68c5a70 LP |
191 | l = strv_append(arg_prefixes, optarg); |
192 | if (!l) { | |
193 | log_error("Out of memory"); | |
194 | return -ENOMEM; | |
195 | } | |
196 | ||
197 | strv_free(arg_prefixes); | |
198 | arg_prefixes = l; | |
7a2a0b90 LP |
199 | |
200 | break; | |
201 | } | |
202 | ||
203 | case '?': | |
204 | return -EINVAL; | |
205 | ||
206 | default: | |
207 | log_error("Unknown option code %c", c); | |
208 | return -EINVAL; | |
209 | } | |
210 | } | |
211 | ||
212 | return 1; | |
213 | } | |
214 | ||
8e1bd70d | 215 | int main(int argc, char *argv[]) { |
c1b664d0 | 216 | int r = 0; |
8e1bd70d | 217 | |
7a2a0b90 LP |
218 | r = parse_argv(argc, argv); |
219 | if (r <= 0) | |
220 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
221 | ||
222 | if (argc-optind > 1) { | |
8e1bd70d LP |
223 | log_error("This program expects one or no arguments."); |
224 | return EXIT_FAILURE; | |
225 | } | |
226 | ||
227 | log_set_target(LOG_TARGET_AUTO); | |
228 | log_parse_environment(); | |
229 | log_open(); | |
230 | ||
4c12626c LP |
231 | umask(0022); |
232 | ||
7a2a0b90 LP |
233 | if (argc > optind) |
234 | r = apply_file(argv[optind], false); | |
8e1bd70d | 235 | else { |
db1413d7 | 236 | char **files, **f; |
c1b664d0 | 237 | |
44143309 | 238 | r = conf_files_list(&files, ".conf", |
44143309 | 239 | "/etc/sysctl.d", |
fc1a2e06 | 240 | "/run/sysctl.d", |
40013ebc | 241 | "/usr/local/lib/sysctl.d", |
44143309 | 242 | "/usr/lib/sysctl.d", |
223a3558 | 243 | "/lib/sysctl.d", |
44143309 KS |
244 | NULL); |
245 | if (r < 0) { | |
246 | log_error("Failed to enumerate sysctl.d files: %s", strerror(-r)); | |
247 | goto finish; | |
248 | } | |
db1413d7 KS |
249 | |
250 | STRV_FOREACH(f, files) { | |
251 | int k; | |
252 | ||
253 | k = apply_file(*f, true); | |
254 | if (k < 0 && r == 0) | |
255 | r = k; | |
256 | } | |
257 | ||
cb804011 LN |
258 | apply_file("/etc/sysctl.conf", true); |
259 | ||
db1413d7 | 260 | strv_free(files); |
8e1bd70d | 261 | } |
44143309 | 262 | finish: |
f68c5a70 LP |
263 | strv_free(arg_prefixes); |
264 | ||
c1b664d0 | 265 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
8e1bd70d | 266 | } |