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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 LP |
32 | #include "util.h" |
33 | ||
34 | #define PROC_SYS_PREFIX "/proc/sys/" | |
35 | ||
7a2a0b90 LP |
36 | static const char *arg_prefix = NULL; |
37 | ||
c1b664d0 | 38 | static int apply_sysctl(const char *property, const char *value) { |
8e1bd70d | 39 | char *p, *n; |
c1b664d0 | 40 | int r = 0, k; |
8e1bd70d LP |
41 | |
42 | log_debug("Setting '%s' to '%s'", property, value); | |
43 | ||
7a2a0b90 LP |
44 | p = new(char, sizeof(PROC_SYS_PREFIX) + strlen(property)); |
45 | if (!p) { | |
8e1bd70d | 46 | log_error("Out of memory"); |
c1b664d0 | 47 | return -ENOMEM; |
8e1bd70d LP |
48 | } |
49 | ||
50 | n = stpcpy(p, PROC_SYS_PREFIX); | |
51 | strcpy(n, property); | |
52 | ||
53 | for (; *n; n++) | |
54 | if (*n == '.') | |
55 | *n = '/'; | |
56 | ||
7a2a0b90 LP |
57 | if (arg_prefix && !path_startswith(p, arg_prefix)) { |
58 | log_debug("Skipping %s", p); | |
59 | free(p); | |
60 | return 0; | |
61 | } | |
62 | ||
63 | k = write_one_line_file(p, value); | |
64 | if (k < 0) { | |
5707631e | 65 | |
c1b664d0 LP |
66 | log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING, |
67 | "Failed to write '%s' to '%s': %s", value, p, strerror(-k)); | |
24a35973 | 68 | |
c1b664d0 LP |
69 | if (k != -ENOENT && r == 0) |
70 | r = k; | |
8e1bd70d LP |
71 | } |
72 | ||
73 | free(p); | |
c1b664d0 LP |
74 | |
75 | return r; | |
8e1bd70d LP |
76 | } |
77 | ||
c1b664d0 | 78 | static int apply_file(const char *path, bool ignore_enoent) { |
8e1bd70d | 79 | FILE *f; |
c1b664d0 | 80 | int r = 0; |
8e1bd70d LP |
81 | |
82 | assert(path); | |
83 | ||
84 | if (!(f = fopen(path, "re"))) { | |
c1b664d0 LP |
85 | if (ignore_enoent && errno == ENOENT) |
86 | return 0; | |
87 | ||
8e1bd70d | 88 | log_error("Failed to open file '%s', ignoring: %m", path); |
c1b664d0 | 89 | return -errno; |
8e1bd70d LP |
90 | } |
91 | ||
db1413d7 | 92 | log_debug("apply: %s\n", path); |
8e1bd70d LP |
93 | while (!feof(f)) { |
94 | char l[LINE_MAX], *p, *value; | |
c1b664d0 | 95 | int k; |
8e1bd70d LP |
96 | |
97 | if (!fgets(l, sizeof(l), f)) { | |
98 | if (feof(f)) | |
99 | break; | |
100 | ||
101 | log_error("Failed to read file '%s', ignoring: %m", path); | |
c1b664d0 | 102 | r = -errno; |
8e1bd70d LP |
103 | goto finish; |
104 | } | |
105 | ||
106 | p = strstrip(l); | |
107 | ||
108 | if (!*p) | |
109 | continue; | |
110 | ||
111 | if (strchr(COMMENTS, *p)) | |
112 | continue; | |
113 | ||
114 | if (!(value = strchr(p, '='))) { | |
115 | log_error("Line is not an assignment in file '%s': %s", path, value); | |
c1b664d0 LP |
116 | |
117 | if (r == 0) | |
118 | r = -EINVAL; | |
8e1bd70d LP |
119 | continue; |
120 | } | |
121 | ||
122 | *value = 0; | |
123 | value++; | |
124 | ||
c1b664d0 LP |
125 | if ((k = apply_sysctl(strstrip(p), strstrip(value))) < 0 && r == 0) |
126 | r = k; | |
8e1bd70d LP |
127 | } |
128 | ||
129 | finish: | |
130 | fclose(f); | |
c1b664d0 LP |
131 | |
132 | return r; | |
8e1bd70d LP |
133 | } |
134 | ||
7a2a0b90 LP |
135 | static int help(void) { |
136 | ||
137 | printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" | |
138 | "Applies kernel sysctl settings.\n\n" | |
139 | " -h --help Show this help\n" | |
140 | " --prefix=PATH Only apply rules that apply to paths with the specified prefix\n", | |
141 | program_invocation_short_name); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | static int parse_argv(int argc, char *argv[]) { | |
147 | ||
148 | enum { | |
149 | ARG_PREFIX | |
150 | }; | |
151 | ||
152 | static const struct option options[] = { | |
153 | { "help", no_argument, NULL, 'h' }, | |
154 | { "prefix", required_argument, NULL, ARG_PREFIX }, | |
155 | { NULL, 0, NULL, 0 } | |
156 | }; | |
157 | ||
158 | int c; | |
159 | ||
160 | assert(argc >= 0); | |
161 | assert(argv); | |
162 | ||
163 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) { | |
164 | ||
165 | switch (c) { | |
166 | ||
167 | case 'h': | |
168 | help(); | |
169 | return 0; | |
170 | ||
171 | case ARG_PREFIX: { | |
172 | char *p; | |
173 | ||
174 | for (p = optarg; *p; p++) | |
175 | if (*p == '.') | |
176 | *p = '/'; | |
177 | ||
178 | arg_prefix = optarg; | |
179 | ||
180 | break; | |
181 | } | |
182 | ||
183 | case '?': | |
184 | return -EINVAL; | |
185 | ||
186 | default: | |
187 | log_error("Unknown option code %c", c); | |
188 | return -EINVAL; | |
189 | } | |
190 | } | |
191 | ||
192 | return 1; | |
193 | } | |
194 | ||
8e1bd70d | 195 | int main(int argc, char *argv[]) { |
c1b664d0 | 196 | int r = 0; |
8e1bd70d | 197 | |
7a2a0b90 LP |
198 | r = parse_argv(argc, argv); |
199 | if (r <= 0) | |
200 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
201 | ||
202 | if (argc-optind > 1) { | |
8e1bd70d LP |
203 | log_error("This program expects one or no arguments."); |
204 | return EXIT_FAILURE; | |
205 | } | |
206 | ||
207 | log_set_target(LOG_TARGET_AUTO); | |
208 | log_parse_environment(); | |
209 | log_open(); | |
210 | ||
7a2a0b90 LP |
211 | if (argc > optind) |
212 | r = apply_file(argv[optind], false); | |
8e1bd70d | 213 | else { |
db1413d7 | 214 | char **files, **f; |
c1b664d0 | 215 | |
44143309 KS |
216 | r = conf_files_list(&files, ".conf", |
217 | "/run/sysctl.d", | |
218 | "/etc/sysctl.d", | |
40013ebc | 219 | "/usr/local/lib/sysctl.d", |
44143309 | 220 | "/usr/lib/sysctl.d", |
223a3558 | 221 | "/lib/sysctl.d", |
44143309 KS |
222 | NULL); |
223 | if (r < 0) { | |
224 | log_error("Failed to enumerate sysctl.d files: %s", strerror(-r)); | |
225 | goto finish; | |
226 | } | |
db1413d7 KS |
227 | |
228 | STRV_FOREACH(f, files) { | |
229 | int k; | |
230 | ||
231 | k = apply_file(*f, true); | |
232 | if (k < 0 && r == 0) | |
233 | r = k; | |
234 | } | |
235 | ||
cb804011 LN |
236 | apply_file("/etc/sysctl.conf", true); |
237 | ||
db1413d7 | 238 | strv_free(files); |
8e1bd70d | 239 | } |
44143309 | 240 | finish: |
c1b664d0 | 241 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
8e1bd70d | 242 | } |