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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 | ||
36 | l = strlen(needle); | |
37 | ||
38 | while ((f = strstr(f, needle))) { | |
39 | ||
40 | if (f > haystack && f[-1] != ',') { | |
41 | f++; | |
42 | continue; | |
43 | } | |
44 | ||
45 | if (f[l] != 0 && f[l] == ',') { | |
46 | f++; | |
47 | continue; | |
48 | } | |
49 | ||
50 | return true; | |
51 | } | |
52 | ||
53 | return false; | |
54 | } | |
55 | ||
56 | static int create_disk( | |
57 | const char *name, | |
58 | const char *device, | |
59 | const char *password, | |
60 | const char *options) { | |
61 | ||
62 | char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *from = NULL, *to = NULL; | |
63 | int r; | |
64 | FILE *f = NULL; | |
65 | ||
66 | assert(name); | |
67 | assert(device); | |
68 | ||
69 | if (!(n = unit_name_build_escape("cryptsetup", name, ".service"))) { | |
70 | r = -ENOMEM; | |
71 | log_error("Failed to allocate unit name."); | |
72 | goto fail; | |
73 | } | |
74 | ||
75 | if (asprintf(&p, "%s/%s", arg_dest, n) < 0) { | |
76 | r = -ENOMEM; | |
77 | log_error("Failed to allocate unit file name."); | |
78 | goto fail; | |
79 | } | |
80 | ||
81 | if (!(u = fstab_node_to_udev_node(device))) { | |
82 | r = -ENOMEM; | |
83 | log_error("Failed to allocate device node."); | |
84 | goto fail; | |
85 | } | |
86 | ||
87 | if (!(d = unit_name_from_path(u, ".device"))) { | |
88 | r = -ENOMEM; | |
89 | log_error("Failed to allocate device name."); | |
90 | goto fail; | |
91 | } | |
92 | ||
93 | if (!(f = fopen(p, "wxe"))) { | |
94 | r = -errno; | |
95 | log_error("Failed to create unit file: %m"); | |
96 | goto fail; | |
97 | } | |
98 | ||
99 | fprintf(f, | |
100 | "[Unit]\n" | |
101 | "Description=Cryptography Setup for %%f\n" | |
102 | "DefaultDependencies=no\n" | |
103 | "BindTo=%s\n" | |
104 | "After=systemd-readahead-collect.service systemd-readahead-replay.service %s\n" | |
105 | "Before=dev-mapper-%%f.device shutdown.target\n", | |
106 | d, d); | |
107 | ||
108 | if (password && (streq(password, "/dev/urandom") || | |
109 | streq(password, "/dev/random") || | |
110 | streq(password, "/dev/hw_random"))) | |
111 | fprintf(f, | |
112 | "After=systemd-random-seed-load.service\n"); | |
113 | ||
114 | fprintf(f, | |
115 | "\n[Service]\n" | |
116 | "Type=oneshot\n" | |
117 | "RemainAfterExit=yes\n" | |
118 | "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " %s '%s' '%s' '%s' '%s'\n" | |
119 | "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " remove '%s'\n", | |
120 | options && has_option(options, "swap") ? "format" : "create", | |
121 | name, u, strempty(password), strempty(options), | |
122 | name); | |
123 | ||
124 | if (options && has_option(options, "tmp")) | |
125 | fprintf(f, | |
126 | "ExecStartPost=/sbin/mke2fs '%s'", | |
127 | u); | |
128 | ||
129 | if (options && has_option(options, "swap")) | |
130 | fprintf(f, | |
131 | "ExecStartPost=/sbin/mkswap '%s'", | |
132 | u); | |
133 | ||
134 | fflush(f); | |
135 | ||
136 | if (ferror(f)) { | |
137 | r = -errno; | |
138 | log_error("Failed to write file: %m"); | |
139 | goto fail; | |
140 | } | |
141 | ||
142 | if (!options || !has_option(options, "noauto")) { | |
143 | ||
144 | if (asprintf(&to, "%s/%s.wants/%s", arg_dest, d, n) < 0) { | |
145 | r = -ENOMEM; | |
146 | goto fail; | |
147 | } | |
148 | ||
149 | if (asprintf(&from, "../%s", n) < 0) { | |
150 | r = -ENOMEM; | |
151 | goto fail; | |
152 | } | |
153 | ||
154 | mkdir_parents(to, 0755); | |
155 | ||
156 | if (symlink(from, to) < 0) { | |
157 | log_error("Failed to create symlink '%s' to '%s': %m", from, to); | |
158 | r = -errno; | |
159 | goto fail; | |
160 | } | |
161 | } | |
162 | ||
163 | r = 0; | |
164 | ||
165 | fail: | |
166 | free(p); | |
167 | free(n); | |
168 | free(d); | |
169 | ||
170 | free(from); | |
171 | free(to); | |
172 | ||
173 | if (f) | |
174 | fclose(f); | |
175 | ||
176 | return r; | |
177 | } | |
178 | ||
179 | int main(int argc, char *argv[]) { | |
180 | FILE *f; | |
181 | int r = EXIT_SUCCESS; | |
182 | unsigned n = 0; | |
183 | ||
184 | if (argc > 2) { | |
185 | log_error("This program takes one or no arguments."); | |
186 | return EXIT_FAILURE; | |
187 | } | |
188 | ||
189 | arg_dest = argv[1]; | |
190 | ||
191 | log_set_target(LOG_TARGET_SYSLOG_OR_KMSG); | |
192 | log_parse_environment(); | |
193 | log_open(); | |
194 | ||
195 | if (!(f = fopen("/etc/crypttab", "re"))) { | |
196 | ||
197 | if (errno == ENOENT) | |
198 | r = EXIT_SUCCESS; | |
199 | else { | |
200 | r = EXIT_FAILURE; | |
201 | log_error("Failed to open /etc/crypttab: %m"); | |
202 | } | |
203 | ||
204 | goto finish; | |
205 | } | |
206 | ||
207 | for (;;) { | |
208 | char line[LINE_MAX], *l; | |
209 | char *name = NULL, *device = NULL, *password = NULL, *options = NULL; | |
210 | int k; | |
211 | ||
212 | if (!(fgets(line, sizeof(line), f))) | |
213 | break; | |
214 | ||
215 | n++; | |
216 | ||
217 | l = strstrip(line); | |
218 | if (*l == '#' || *l == 0) | |
219 | continue; | |
220 | ||
221 | if ((k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &password, &options)) < 2 || k > 4) { | |
222 | log_error("Failed to parse /etc/crypttab:%u, ignoring.", n); | |
223 | r = EXIT_FAILURE; | |
224 | goto next; | |
225 | } | |
226 | ||
227 | if (create_disk(name, device, password, options) < 0) | |
228 | r = EXIT_FAILURE; | |
229 | ||
230 | next: | |
231 | free(name); | |
232 | free(device); | |
233 | free(password); | |
234 | free(options); | |
235 | } | |
236 | ||
237 | finish: | |
238 | return r; | |
239 | } |