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52ad194e | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2897b343 MP |
2 | |
3 | #include <fcntl.h> | |
4 | #include <stdio.h> | |
5 | #include <getopt.h> | |
6 | ||
7 | #include "architecture.h" | |
8 | #include "dissect-image.h" | |
9 | #include "hexdecoct.h" | |
10 | #include "log.h" | |
11 | #include "loop-util.h" | |
6e866b33 | 12 | #include "main-func.h" |
2897b343 | 13 | #include "string-util.h" |
52ad194e MB |
14 | #include "strv.h" |
15 | #include "user-util.h" | |
2897b343 MP |
16 | #include "util.h" |
17 | ||
18 | static enum { | |
19 | ACTION_DISSECT, | |
20 | ACTION_MOUNT, | |
21 | } arg_action = ACTION_DISSECT; | |
22 | static const char *arg_image = NULL; | |
23 | static const char *arg_path = NULL; | |
24 | static DissectImageFlags arg_flags = DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_DISCARD_ON_LOOP; | |
25 | static void *arg_root_hash = NULL; | |
26 | static size_t arg_root_hash_size = 0; | |
27 | ||
6e866b33 MB |
28 | STATIC_DESTRUCTOR_REGISTER(arg_root_hash, freep); |
29 | ||
2897b343 MP |
30 | static void help(void) { |
31 | printf("%s [OPTIONS...] IMAGE\n" | |
32 | "%s [OPTIONS...] --mount IMAGE PATH\n" | |
33 | "Dissect a file system OS image.\n\n" | |
34 | " -h --help Show this help\n" | |
35 | " --version Show package version\n" | |
36 | " -m --mount Mount the image to the specified directory\n" | |
37 | " -r --read-only Mount read-only\n" | |
38 | " --discard=MODE Choose 'discard' mode (disabled, loop, all, crypto)\n" | |
39 | " --root-hash=HASH Specify root hash for verity\n", | |
40 | program_invocation_short_name, | |
41 | program_invocation_short_name); | |
42 | } | |
43 | ||
44 | static int parse_argv(int argc, char *argv[]) { | |
45 | ||
46 | enum { | |
47 | ARG_VERSION = 0x100, | |
48 | ARG_DISCARD, | |
49 | ARG_ROOT_HASH, | |
50 | }; | |
51 | ||
52 | static const struct option options[] = { | |
53 | { "help", no_argument, NULL, 'h' }, | |
54 | { "version", no_argument, NULL, ARG_VERSION }, | |
55 | { "mount", no_argument, NULL, 'm' }, | |
56 | { "read-only", no_argument, NULL, 'r' }, | |
57 | { "discard", required_argument, NULL, ARG_DISCARD }, | |
58 | { "root-hash", required_argument, NULL, ARG_ROOT_HASH }, | |
59 | {} | |
60 | }; | |
61 | ||
62 | int c, r; | |
63 | ||
64 | assert(argc >= 0); | |
65 | assert(argv); | |
66 | ||
67 | while ((c = getopt_long(argc, argv, "hmr", options, NULL)) >= 0) { | |
68 | ||
69 | switch (c) { | |
70 | ||
71 | case 'h': | |
72 | help(); | |
73 | return 0; | |
74 | ||
75 | case ARG_VERSION: | |
76 | return version(); | |
77 | ||
78 | case 'm': | |
79 | arg_action = ACTION_MOUNT; | |
80 | break; | |
81 | ||
82 | case 'r': | |
83 | arg_flags |= DISSECT_IMAGE_READ_ONLY; | |
84 | break; | |
85 | ||
86 | case ARG_DISCARD: { | |
87 | DissectImageFlags flags; | |
88 | ||
89 | if (streq(optarg, "disabled")) | |
90 | flags = 0; | |
91 | else if (streq(optarg, "loop")) | |
92 | flags = DISSECT_IMAGE_DISCARD_ON_LOOP; | |
93 | else if (streq(optarg, "all")) | |
94 | flags = DISSECT_IMAGE_DISCARD_ON_LOOP | DISSECT_IMAGE_DISCARD; | |
95 | else if (streq(optarg, "crypt")) | |
96 | flags = DISSECT_IMAGE_DISCARD_ANY; | |
6e866b33 MB |
97 | else |
98 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
99 | "Unknown --discard= parameter: %s", | |
100 | optarg); | |
2897b343 MP |
101 | arg_flags = (arg_flags & ~DISSECT_IMAGE_DISCARD_ANY) | flags; |
102 | ||
103 | break; | |
104 | } | |
105 | ||
106 | case ARG_ROOT_HASH: { | |
107 | void *p; | |
108 | size_t l; | |
109 | ||
110 | r = unhexmem(optarg, strlen(optarg), &p, &l); | |
111 | if (r < 0) | |
6e866b33 | 112 | return log_error_errno(r, "Failed to parse root hash '%s': %m", optarg); |
2897b343 MP |
113 | if (l < sizeof(sd_id128_t)) { |
114 | log_error("Root hash must be at least 128bit long: %s", optarg); | |
115 | free(p); | |
116 | return -EINVAL; | |
117 | } | |
118 | ||
119 | free(arg_root_hash); | |
120 | arg_root_hash = p; | |
121 | arg_root_hash_size = l; | |
122 | break; | |
123 | } | |
124 | ||
125 | case '?': | |
126 | return -EINVAL; | |
127 | ||
128 | default: | |
129 | assert_not_reached("Unhandled option"); | |
130 | } | |
131 | ||
132 | } | |
133 | ||
134 | switch (arg_action) { | |
135 | ||
136 | case ACTION_DISSECT: | |
6e866b33 MB |
137 | if (optind + 1 != argc) |
138 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
139 | "Expected a file path as only argument."); | |
2897b343 MP |
140 | |
141 | arg_image = argv[optind]; | |
142 | arg_flags |= DISSECT_IMAGE_READ_ONLY; | |
143 | break; | |
144 | ||
145 | case ACTION_MOUNT: | |
6e866b33 MB |
146 | if (optind + 2 != argc) |
147 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
148 | "Expected a file path and mount point path as only arguments."); | |
2897b343 MP |
149 | |
150 | arg_image = argv[optind]; | |
151 | arg_path = argv[optind + 1]; | |
152 | break; | |
153 | ||
154 | default: | |
155 | assert_not_reached("Unknown action."); | |
156 | } | |
157 | ||
158 | return 1; | |
159 | } | |
160 | ||
6e866b33 | 161 | static int run(int argc, char *argv[]) { |
2897b343 MP |
162 | _cleanup_(loop_device_unrefp) LoopDevice *d = NULL; |
163 | _cleanup_(decrypted_image_unrefp) DecryptedImage *di = NULL; | |
164 | _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; | |
165 | int r; | |
166 | ||
167 | log_parse_environment(); | |
168 | log_open(); | |
169 | ||
170 | r = parse_argv(argc, argv); | |
171 | if (r <= 0) | |
6e866b33 | 172 | return r; |
2897b343 MP |
173 | |
174 | r = loop_device_make_by_path(arg_image, (arg_flags & DISSECT_IMAGE_READ_ONLY) ? O_RDONLY : O_RDWR, &d); | |
6e866b33 MB |
175 | if (r < 0) |
176 | return log_error_errno(r, "Failed to set up loopback device: %m"); | |
2897b343 MP |
177 | |
178 | if (!arg_root_hash) { | |
179 | r = root_hash_load(arg_image, &arg_root_hash, &arg_root_hash_size); | |
6e866b33 MB |
180 | if (r < 0) |
181 | return log_error_errno(r, "Failed to read root hash file for %s: %m", arg_image); | |
2897b343 MP |
182 | } |
183 | ||
b012e921 MB |
184 | r = dissect_image_and_warn(d->fd, arg_image, arg_root_hash, arg_root_hash_size, arg_flags, &m); |
185 | if (r < 0) | |
6e866b33 | 186 | return r; |
2897b343 MP |
187 | |
188 | switch (arg_action) { | |
189 | ||
190 | case ACTION_DISSECT: { | |
191 | unsigned i; | |
192 | ||
193 | for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) { | |
194 | DissectedPartition *p = m->partitions + i; | |
195 | int k; | |
196 | ||
197 | if (!p->found) | |
198 | continue; | |
199 | ||
200 | printf("Found %s '%s' partition", | |
201 | p->rw ? "writable" : "read-only", | |
202 | partition_designator_to_string(i)); | |
203 | ||
204 | if (!sd_id128_is_null(p->uuid)) | |
205 | printf(" (UUID " SD_ID128_FORMAT_STR ")", SD_ID128_FORMAT_VAL(p->uuid)); | |
206 | ||
207 | if (p->fstype) | |
208 | printf(" of type %s", p->fstype); | |
209 | ||
210 | if (p->architecture != _ARCHITECTURE_INVALID) | |
211 | printf(" for %s", architecture_to_string(p->architecture)); | |
212 | ||
213 | k = PARTITION_VERITY_OF(i); | |
214 | if (k >= 0) | |
215 | printf(" %s verity", m->partitions[k].found ? "with" : "without"); | |
216 | ||
217 | if (p->partno >= 0) | |
218 | printf(" on partition #%i", p->partno); | |
219 | ||
220 | if (p->node) | |
221 | printf(" (%s)", p->node); | |
222 | ||
223 | putchar('\n'); | |
224 | } | |
225 | ||
52ad194e | 226 | r = dissected_image_acquire_metadata(m); |
6e866b33 MB |
227 | if (r < 0) |
228 | return log_error_errno(r, "Failed to acquire image metadata: %m"); | |
52ad194e MB |
229 | |
230 | if (m->hostname) | |
231 | printf(" Hostname: %s\n", m->hostname); | |
232 | ||
233 | if (!sd_id128_is_null(m->machine_id)) | |
234 | printf("Machine ID: " SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(m->machine_id)); | |
235 | ||
236 | if (!strv_isempty(m->machine_info)) { | |
237 | char **p, **q; | |
238 | ||
239 | STRV_FOREACH_PAIR(p, q, m->machine_info) | |
240 | printf("%s %s=%s\n", | |
241 | p == m->machine_info ? "Mach. Info:" : " ", | |
242 | *p, *q); | |
243 | } | |
244 | ||
245 | if (!strv_isempty(m->os_release)) { | |
246 | char **p, **q; | |
247 | ||
248 | STRV_FOREACH_PAIR(p, q, m->os_release) | |
249 | printf("%s %s=%s\n", | |
250 | p == m->os_release ? "OS Release:" : " ", | |
251 | *p, *q); | |
252 | } | |
253 | ||
2897b343 MP |
254 | break; |
255 | } | |
256 | ||
257 | case ACTION_MOUNT: | |
258 | r = dissected_image_decrypt_interactively(m, NULL, arg_root_hash, arg_root_hash_size, arg_flags, &di); | |
259 | if (r < 0) | |
6e866b33 | 260 | return r; |
2897b343 | 261 | |
52ad194e | 262 | r = dissected_image_mount(m, arg_path, UID_INVALID, arg_flags); |
6e866b33 MB |
263 | if (r < 0) |
264 | return log_error_errno(r, "Failed to mount image: %m"); | |
2897b343 MP |
265 | |
266 | if (di) { | |
267 | r = decrypted_image_relinquish(di); | |
6e866b33 MB |
268 | if (r < 0) |
269 | return log_error_errno(r, "Failed to relinquish DM devices: %m"); | |
2897b343 MP |
270 | } |
271 | ||
272 | loop_device_relinquish(d); | |
273 | break; | |
274 | ||
275 | default: | |
276 | assert_not_reached("Unknown action."); | |
277 | } | |
278 | ||
6e866b33 | 279 | return 0; |
2897b343 | 280 | } |
6e866b33 MB |
281 | |
282 | DEFINE_MAIN_FUNCTION(run); |