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e23a0ce8 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 <string.h> | |
23 | #include <errno.h> | |
24 | #include <unistd.h> | |
25 | ||
26 | #include "log.h" | |
27 | #include "util.h" | |
28 | #include "unit-name.h" | |
29 | ||
30 | const char *arg_dest = "/tmp"; | |
31 | ||
32 | static bool has_option(const char *haystack, const char *needle) { | |
33 | const char *f = haystack; | |
34 | size_t l; | |
35 | ||
f653f683 LP |
36 | assert(needle); |
37 | ||
38 | if (!haystack) | |
39 | return false; | |
40 | ||
e23a0ce8 LP |
41 | l = strlen(needle); |
42 | ||
43 | while ((f = strstr(f, needle))) { | |
44 | ||
45 | if (f > haystack && f[-1] != ',') { | |
46 | f++; | |
47 | continue; | |
48 | } | |
49 | ||
aae5220d | 50 | if (f[l] != 0 && f[l] != ',') { |
e23a0ce8 LP |
51 | f++; |
52 | continue; | |
53 | } | |
54 | ||
55 | return true; | |
56 | } | |
57 | ||
58 | return false; | |
59 | } | |
60 | ||
61 | static int create_disk( | |
62 | const char *name, | |
63 | const char *device, | |
64 | const char *password, | |
65 | const char *options) { | |
66 | ||
74715b82 | 67 | char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *from = NULL, *to = NULL, *e = NULL; |
e23a0ce8 LP |
68 | int r; |
69 | FILE *f = NULL; | |
155da457 | 70 | bool noauto, nofail; |
e23a0ce8 LP |
71 | |
72 | assert(name); | |
73 | assert(device); | |
74 | ||
155da457 LP |
75 | noauto = has_option(options, "noauto"); |
76 | nofail = has_option(options, "nofail"); | |
77 | ||
e23a0ce8 LP |
78 | if (!(n = unit_name_build_escape("cryptsetup", name, ".service"))) { |
79 | r = -ENOMEM; | |
80 | log_error("Failed to allocate unit name."); | |
81 | goto fail; | |
82 | } | |
83 | ||
84 | if (asprintf(&p, "%s/%s", arg_dest, n) < 0) { | |
85 | r = -ENOMEM; | |
86 | log_error("Failed to allocate unit file name."); | |
87 | goto fail; | |
88 | } | |
89 | ||
90 | if (!(u = fstab_node_to_udev_node(device))) { | |
91 | r = -ENOMEM; | |
92 | log_error("Failed to allocate device node."); | |
93 | goto fail; | |
94 | } | |
95 | ||
96 | if (!(d = unit_name_from_path(u, ".device"))) { | |
97 | r = -ENOMEM; | |
98 | log_error("Failed to allocate device name."); | |
99 | goto fail; | |
100 | } | |
101 | ||
102 | if (!(f = fopen(p, "wxe"))) { | |
103 | r = -errno; | |
104 | log_error("Failed to create unit file: %m"); | |
105 | goto fail; | |
106 | } | |
107 | ||
108 | fprintf(f, | |
109 | "[Unit]\n" | |
a4477e68 | 110 | "Description=Cryptography Setup for %%I\n" |
155da457 | 111 | "Conflicts=umount.target\n" |
e23a0ce8 | 112 | "DefaultDependencies=no\n" |
49d50c55 | 113 | "BindTo=%s dev-mapper-%%i.device\n" |
e23a0ce8 | 114 | "After=systemd-readahead-collect.service systemd-readahead-replay.service %s\n" |
155da457 | 115 | "Before=umount.target\n", |
e23a0ce8 LP |
116 | d, d); |
117 | ||
155da457 LP |
118 | if (!nofail) |
119 | fprintf(f, | |
120 | "Before=cryptsetup.target\n"); | |
121 | ||
e23a0ce8 LP |
122 | if (password && (streq(password, "/dev/urandom") || |
123 | streq(password, "/dev/random") || | |
124 | streq(password, "/dev/hw_random"))) | |
125 | fprintf(f, | |
126 | "After=systemd-random-seed-load.service\n"); | |
127 | ||
128 | fprintf(f, | |
129 | "\n[Service]\n" | |
130 | "Type=oneshot\n" | |
131 | "RemainAfterExit=yes\n" | |
90724929 | 132 | "TimeoutSec=0\n" /* the binary handles timeouts anyway */ |
260ab287 | 133 | "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n" |
7f4e0805 | 134 | "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n", |
e23a0ce8 LP |
135 | name, u, strempty(password), strempty(options), |
136 | name); | |
137 | ||
f653f683 | 138 | if (has_option(options, "tmp")) |
e23a0ce8 | 139 | fprintf(f, |
50109038 | 140 | "ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n", |
1d3399e6 | 141 | name); |
e23a0ce8 | 142 | |
f653f683 | 143 | if (has_option(options, "swap")) |
e23a0ce8 | 144 | fprintf(f, |
50109038 | 145 | "ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n", |
1d3399e6 | 146 | name); |
e23a0ce8 LP |
147 | |
148 | fflush(f); | |
149 | ||
150 | if (ferror(f)) { | |
151 | r = -errno; | |
152 | log_error("Failed to write file: %m"); | |
153 | goto fail; | |
154 | } | |
155 | ||
74715b82 LP |
156 | if (asprintf(&from, "../%s", n) < 0) { |
157 | r = -ENOMEM; | |
158 | goto fail; | |
159 | } | |
160 | ||
155da457 | 161 | if (!noauto) { |
e23a0ce8 LP |
162 | |
163 | if (asprintf(&to, "%s/%s.wants/%s", arg_dest, d, n) < 0) { | |
164 | r = -ENOMEM; | |
165 | goto fail; | |
166 | } | |
167 | ||
e23a0ce8 LP |
168 | mkdir_parents(to, 0755); |
169 | ||
170 | if (symlink(from, to) < 0) { | |
171 | log_error("Failed to create symlink '%s' to '%s': %m", from, to); | |
172 | r = -errno; | |
173 | goto fail; | |
174 | } | |
2f8cd170 LP |
175 | |
176 | free(to); | |
177 | to = NULL; | |
178 | ||
155da457 LP |
179 | if (!nofail) |
180 | asprintf(&to, "%s/cryptsetup.target.requires/%s", arg_dest, n); | |
181 | else | |
182 | asprintf(&to, "%s/cryptsetup.target.wants/%s", arg_dest, n); | |
2f8cd170 | 183 | |
155da457 LP |
184 | if (!to) { |
185 | r = -ENOMEM; | |
186 | goto fail; | |
187 | } | |
2f8cd170 | 188 | |
155da457 | 189 | mkdir_parents(to, 0755); |
2f8cd170 | 190 | |
155da457 LP |
191 | if (symlink(from, to) < 0) { |
192 | log_error("Failed to create symlink '%s' to '%s': %m", from, to); | |
193 | r = -errno; | |
194 | goto fail; | |
2f8cd170 | 195 | } |
e23a0ce8 LP |
196 | } |
197 | ||
74715b82 LP |
198 | free(to); |
199 | to = NULL; | |
200 | ||
201 | e = unit_name_escape(name); | |
8c4dd542 | 202 | if (asprintf(&to, "%s/dev-mapper-%s.device.requires/%s", arg_dest, e, n) < 0) { |
74715b82 LP |
203 | r = -ENOMEM; |
204 | goto fail; | |
205 | } | |
206 | ||
207 | mkdir_parents(to, 0755); | |
208 | ||
209 | if (symlink(from, to) < 0) { | |
210 | log_error("Failed to create symlink '%s' to '%s': %m", from, to); | |
211 | r = -errno; | |
212 | goto fail; | |
213 | } | |
214 | ||
e23a0ce8 LP |
215 | r = 0; |
216 | ||
217 | fail: | |
218 | free(p); | |
219 | free(n); | |
220 | free(d); | |
74715b82 | 221 | free(e); |
e23a0ce8 LP |
222 | |
223 | free(from); | |
224 | free(to); | |
225 | ||
226 | if (f) | |
227 | fclose(f); | |
228 | ||
229 | return r; | |
230 | } | |
231 | ||
232 | int main(int argc, char *argv[]) { | |
233 | FILE *f; | |
234 | int r = EXIT_SUCCESS; | |
235 | unsigned n = 0; | |
236 | ||
237 | if (argc > 2) { | |
238 | log_error("This program takes one or no arguments."); | |
239 | return EXIT_FAILURE; | |
240 | } | |
241 | ||
2a796654 LP |
242 | if (argc > 1) |
243 | arg_dest = argv[1]; | |
e23a0ce8 LP |
244 | |
245 | log_set_target(LOG_TARGET_SYSLOG_OR_KMSG); | |
246 | log_parse_environment(); | |
247 | log_open(); | |
248 | ||
4c12626c LP |
249 | umask(0022); |
250 | ||
e23a0ce8 LP |
251 | if (!(f = fopen("/etc/crypttab", "re"))) { |
252 | ||
253 | if (errno == ENOENT) | |
254 | r = EXIT_SUCCESS; | |
255 | else { | |
256 | r = EXIT_FAILURE; | |
257 | log_error("Failed to open /etc/crypttab: %m"); | |
258 | } | |
259 | ||
260 | goto finish; | |
261 | } | |
262 | ||
263 | for (;;) { | |
264 | char line[LINE_MAX], *l; | |
265 | char *name = NULL, *device = NULL, *password = NULL, *options = NULL; | |
266 | int k; | |
267 | ||
268 | if (!(fgets(line, sizeof(line), f))) | |
269 | break; | |
270 | ||
271 | n++; | |
272 | ||
273 | l = strstrip(line); | |
274 | if (*l == '#' || *l == 0) | |
275 | continue; | |
276 | ||
277 | if ((k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &password, &options)) < 2 || k > 4) { | |
278 | log_error("Failed to parse /etc/crypttab:%u, ignoring.", n); | |
279 | r = EXIT_FAILURE; | |
280 | goto next; | |
281 | } | |
282 | ||
283 | if (create_disk(name, device, password, options) < 0) | |
284 | r = EXIT_FAILURE; | |
285 | ||
286 | next: | |
287 | free(name); | |
288 | free(device); | |
289 | free(password); | |
290 | free(options); | |
291 | } | |
292 | ||
293 | finish: | |
294 | return r; | |
295 | } |