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 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.
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.
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/>.
28 #include "unit-name.h"
30 const char *arg_dest = "/tmp";
32 static bool has_option(const char *haystack, const char *needle) {
33 const char *f = haystack;
43 while ((f = strstr(f, needle))) {
45 if (f > haystack && f[-1] != ',') {
50 if (f[l] != 0 && f[l] != ',') {
61 static int create_disk(
65 const char *options) {
67 char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *from = NULL, *to = NULL, *e = NULL;
75 noauto = has_option(options, "noauto");
76 nofail = has_option(options, "nofail");
78 if (!(n = unit_name_build_escape("cryptsetup", name, ".service"))) {
80 log_error("Failed to allocate unit name.");
84 if (asprintf(&p, "%s/%s", arg_dest, n) < 0) {
86 log_error("Failed to allocate unit file name.");
90 if (!(u = fstab_node_to_udev_node(device))) {
92 log_error("Failed to allocate device node.");
96 if (!(d = unit_name_from_path(u, ".device"))) {
98 log_error("Failed to allocate device name.");
102 if (!(f = fopen(p, "wxe"))) {
104 log_error("Failed to create unit file: %m");
110 "Description=Cryptography Setup for %%I\n"
111 "Conflicts=umount.target\n"
112 "DefaultDependencies=no\n"
113 "BindTo=%s dev-mapper-%%i.device\n"
114 "After=systemd-readahead-collect.service systemd-readahead-replay.service %s\n"
115 "Before=umount.target\n",
120 "Before=cryptsetup.target\n");
122 if (password && (streq(password, "/dev/urandom") ||
123 streq(password, "/dev/random") ||
124 streq(password, "/dev/hw_random")))
126 "After=systemd-random-seed-load.service\n");
129 "Before=local-fs.target\n");
134 "RemainAfterExit=yes\n"
135 "TimeoutSec=0\n" /* the binary handles timeouts anyway */
136 "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n"
137 "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n",
138 name, u, strempty(password), strempty(options),
141 if (has_option(options, "tmp"))
143 "ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n",
146 if (has_option(options, "swap"))
148 "ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n",
155 log_error("Failed to write file: %m");
159 if (asprintf(&from, "../%s", n) < 0) {
166 if (asprintf(&to, "%s/%s.wants/%s", arg_dest, d, n) < 0) {
171 mkdir_parents(to, 0755);
173 if (symlink(from, to) < 0) {
174 log_error("Failed to create symlink '%s' to '%s': %m", from, to);
183 asprintf(&to, "%s/cryptsetup.target.requires/%s", arg_dest, n);
185 asprintf(&to, "%s/cryptsetup.target.wants/%s", arg_dest, n);
192 mkdir_parents(to, 0755);
194 if (symlink(from, to) < 0) {
195 log_error("Failed to create symlink '%s' to '%s': %m", from, to);
204 e = unit_name_escape(name);
205 if (asprintf(&to, "%s/dev-mapper-%s.device.requires/%s", arg_dest, e, n) < 0) {
210 mkdir_parents(to, 0755);
212 if (symlink(from, to) < 0) {
213 log_error("Failed to create symlink '%s' to '%s': %m", from, to);
235 int main(int argc, char *argv[]) {
237 int r = EXIT_SUCCESS;
241 log_error("This program takes one or no arguments.");
248 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
249 log_parse_environment();
254 if (!(f = fopen("/etc/crypttab", "re"))) {
260 log_error("Failed to open /etc/crypttab: %m");
267 char line[LINE_MAX], *l;
268 char *name = NULL, *device = NULL, *password = NULL, *options = NULL;
271 if (!(fgets(line, sizeof(line), f)))
277 if (*l == '#' || *l == 0)
280 if ((k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &password, &options)) < 2 || k > 4) {
281 log_error("Failed to parse /etc/crypttab:%u, ignoring.", n);
286 if (create_disk(name, device, password, options) < 0)