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git.ipfire.org Git - thirdparty/systemd.git/blob - src/cryptsetup/cryptsetup-generator.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
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
11 (at your option) any later version.
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 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
28 #include "unit-name.h"
33 static const char *arg_dest
= "/tmp";
34 static bool arg_enabled
= true;
35 static bool arg_read_crypttab
= true;
36 static char **arg_proc_cmdline_disks
= NULL
;
38 static bool has_option(const char *haystack
, const char *needle
) {
39 const char *f
= haystack
;
49 while ((f
= strstr(f
, needle
))) {
51 if (f
> haystack
&& f
[-1] != ',') {
56 if (f
[l
] != 0 && f
[l
] != ',') {
67 static int create_disk(
71 const char *options
) {
73 char *p
= NULL
, *n
= NULL
, *d
= NULL
, *u
= NULL
, *from
= NULL
, *to
= NULL
, *e
= NULL
;
81 noauto
= has_option(options
, "noauto");
82 nofail
= has_option(options
, "nofail");
84 n
= unit_name_from_path_instance("systemd-cryptsetup", name
, ".service");
87 log_error("Failed to allocate unit name.");
91 p
= strjoin(arg_dest
, "/", n
, NULL
);
94 log_error("Failed to allocate unit file name.");
98 u
= fstab_node_to_udev_node(device
);
101 log_error("Failed to allocate device node.");
105 d
= unit_name_from_path(u
, ".device");
108 log_error("Failed to allocate device name.");
115 log_error("Failed to create unit file: %m");
120 "# Automatically generated by systemd-cryptsetup-generator\n\n"
122 "Description=Cryptography Setup for %%I\n"
123 "Documentation=man:systemd-cryptsetup@.service(8) man:crypttab(5)\n"
124 "SourcePath=/etc/crypttab\n"
125 "Conflicts=umount.target\n"
126 "DefaultDependencies=no\n"
127 "BindsTo=%s dev-mapper-%%i.device\n"
128 "After=systemd-readahead-collect.service systemd-readahead-replay.service %s\n"
129 "Before=umount.target\n",
134 "Before=cryptsetup.target\n");
136 if (password
&& (streq(password
, "/dev/urandom") ||
137 streq(password
, "/dev/random") ||
138 streq(password
, "/dev/hw_random")))
139 fputs("After=systemd-random-seed-load.service\n", f
);
141 fputs("Before=local-fs.target\n", f
);
146 "RemainAfterExit=yes\n"
147 "TimeoutSec=0\n" /* the binary handles timeouts anyway */
148 "ExecStart=" SYSTEMD_CRYPTSETUP_PATH
" attach '%s' '%s' '%s' '%s'\n"
149 "ExecStop=" SYSTEMD_CRYPTSETUP_PATH
" detach '%s'\n",
150 name
, u
, strempty(password
), strempty(options
),
153 if (has_option(options
, "tmp"))
155 "ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n",
158 if (has_option(options
, "swap"))
160 "ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n",
167 log_error("Failed to write file: %m");
171 if (asprintf(&from
, "../%s", n
) < 0) {
178 to
= strjoin(arg_dest
, "/", d
, ".wants/", n
, NULL
);
184 mkdir_parents_label(to
, 0755);
185 if (symlink(from
, to
) < 0) {
186 log_error("Failed to create symlink '%s' to '%s': %m", from
, to
);
194 to
= strjoin(arg_dest
, "/cryptsetup.target.requires/", n
, NULL
);
196 to
= strjoin(arg_dest
, "/cryptsetup.target.wants/", n
, NULL
);
202 mkdir_parents_label(to
, 0755);
203 if (symlink(from
, to
) < 0) {
204 log_error("Failed to create symlink '%s' to '%s': %m", from
, to
);
213 e
= unit_name_escape(name
);
214 to
= strjoin(arg_dest
, "/dev-mapper-", e
, ".device.requires/", n
, NULL
);
220 mkdir_parents_label(to
, 0755);
221 if (symlink(from
, to
) < 0) {
222 log_error("Failed to create symlink '%s' to '%s': %m", from
, to
);
244 static int parse_proc_cmdline(void) {
245 char *line
, *w
, *state
;
249 if (detect_container(NULL
) > 0)
252 r
= read_one_line_file("/proc/cmdline", &line
);
254 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r
));
258 FOREACH_WORD_QUOTED(w
, l
, line
, state
) {
261 word
= strndup(w
, l
);
267 if (startswith(word
, "luks=")) {
268 r
= parse_boolean(word
+ 5);
270 log_warning("Failed to parse luks switch %s. Ignoring.", word
+ 5);
274 } else if (startswith(word
, "rd.luks=")) {
277 r
= parse_boolean(word
+ 8);
279 log_warning("Failed to parse luks switch %s. Ignoring.", word
+ 8);
284 } else if (startswith(word
, "luks.crypttab=")) {
285 r
= parse_boolean(word
+ 14);
287 log_warning("Failed to parse luks crypttab switch %s. Ignoring.", word
+ 14);
289 arg_read_crypttab
= r
;
291 } else if (startswith(word
, "rd.luks.crypttab=")) {
294 r
= parse_boolean(word
+ 17);
296 log_warning("Failed to parse luks crypttab switch %s. Ignoring.", word
+ 17);
298 arg_read_crypttab
= r
;
301 } else if (startswith(word
, "luks.uuid=")) {
304 t
= strv_append(arg_proc_cmdline_disks
, word
+ 10);
309 strv_free(arg_proc_cmdline_disks
);
310 arg_proc_cmdline_disks
= t
;
312 } else if (startswith(word
, "rd.luks.uuid=")) {
317 t
= strv_append(arg_proc_cmdline_disks
, word
+ 13);
322 strv_free(arg_proc_cmdline_disks
);
323 arg_proc_cmdline_disks
= t
;
326 } else if (startswith(word
, "luks.") ||
327 (in_initrd() && startswith(word
, "rd.luks."))) {
329 log_warning("Unknown kernel switch %s. Ignoring.", word
);
342 int main(int argc
, char *argv
[]) {
344 int r
= EXIT_SUCCESS
;
348 if (argc
> 1 && argc
!= 4) {
349 log_error("This program takes three or no arguments.");
356 log_set_target(LOG_TARGET_SAFE
);
357 log_parse_environment();
362 if (parse_proc_cmdline() < 0)
370 STRV_FOREACH(i
, arg_proc_cmdline_disks
) {
374 if (startswith(p
, "luks-"))
377 name
= strappend("luks-", *i
);
378 device
= strappend("UUID=", *i
);
380 if (!name
|| !device
) {
388 if (create_disk(name
, device
, NULL
, NULL
) < 0)
395 if (!arg_read_crypttab
)
398 f
= fopen("/etc/crypttab", "re");
405 log_error("Failed to open /etc/crypttab: %m");
412 char line
[LINE_MAX
], *l
;
413 char *name
= NULL
, *device
= NULL
, *password
= NULL
, *options
= NULL
;
416 if (!fgets(line
, sizeof(line
), f
))
422 if (*l
== '#' || *l
== 0)
425 k
= sscanf(l
, "%ms %ms %ms %ms", &name
, &device
, &password
, &options
);
426 if (k
< 2 || k
> 4) {
427 log_error("Failed to parse /etc/crypttab:%u, ignoring.", n
);
432 if (create_disk(name
, device
, password
, options
) < 0)
446 strv_free(arg_proc_cmdline_disks
);