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9b4abc69 ED |
1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2 | ||
3 | /* Copyright © 2019 Oracle and/or its affiliates. */ | |
4 | ||
5 | /* Generally speaking, the pstore contains a small number of files | |
6 | * that in turn contain a small amount of data. */ | |
7 | #include <errno.h> | |
8 | #include <stdio.h> | |
9 | #include <stdio_ext.h> | |
10 | #include <sys/prctl.h> | |
11 | #include <sys/xattr.h> | |
12 | #include <unistd.h> | |
13 | ||
14 | #include "sd-daemon.h" | |
15 | #include "sd-journal.h" | |
16 | #include "sd-login.h" | |
17 | #include "sd-messages.h" | |
18 | ||
19 | #include "acl-util.h" | |
20 | #include "alloc-util.h" | |
21 | #include "capability-util.h" | |
22 | #include "cgroup-util.h" | |
23 | #include "compress.h" | |
24 | #include "conf-parser.h" | |
25 | #include "copy.h" | |
26 | #include "dirent-util.h" | |
27 | #include "escape.h" | |
28 | #include "fd-util.h" | |
29 | #include "fileio.h" | |
30 | #include "fs-util.h" | |
31 | #include "io-util.h" | |
32 | #include "journal-importer.h" | |
33 | #include "log.h" | |
34 | #include "macro.h" | |
35 | #include "main-func.h" | |
36 | #include "missing.h" | |
37 | #include "mkdir.h" | |
38 | #include "parse-util.h" | |
39 | #include "process-util.h" | |
40 | #include "signal-util.h" | |
41 | #include "socket-util.h" | |
42 | #include "special.h" | |
43 | #include "sort-util.h" | |
44 | #include "string-table.h" | |
45 | #include "string-util.h" | |
46 | #include "strv.h" | |
47 | #include "tmpfile-util.h" | |
48 | #include "user-util.h" | |
49 | #include "util.h" | |
50 | ||
51 | /* Command line argument handling */ | |
52 | typedef enum PStoreStorage { | |
53 | PSTORE_STORAGE_NONE, | |
54 | PSTORE_STORAGE_EXTERNAL, | |
55 | PSTORE_STORAGE_JOURNAL, | |
56 | _PSTORE_STORAGE_MAX, | |
57 | _PSTORE_STORAGE_INVALID = -1 | |
58 | } PStoreStorage; | |
59 | ||
60 | static const char* const pstore_storage_table[_PSTORE_STORAGE_MAX] = { | |
61 | [PSTORE_STORAGE_NONE] = "none", | |
62 | [PSTORE_STORAGE_EXTERNAL] = "external", | |
63 | [PSTORE_STORAGE_JOURNAL] = "journal", | |
64 | }; | |
65 | ||
66 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP(pstore_storage, PStoreStorage); | |
67 | static DEFINE_CONFIG_PARSE_ENUM(config_parse_pstore_storage, pstore_storage, PStoreStorage, "Failed to parse storage setting"); | |
68 | ||
69 | static PStoreStorage arg_storage = PSTORE_STORAGE_EXTERNAL; | |
70 | ||
71 | static bool arg_unlink = true; | |
72 | static const char *arg_sourcedir = "/sys/fs/pstore"; | |
73 | static const char *arg_archivedir = "/var/lib/systemd/pstore"; | |
74 | ||
75 | static int parse_config(void) { | |
76 | static const ConfigTableItem items[] = { | |
77 | { "PStore", "Unlink", config_parse_bool, 0, &arg_unlink }, | |
78 | { "PStore", "Storage", config_parse_pstore_storage, 0, &arg_storage }, | |
79 | {} | |
80 | }; | |
81 | ||
82 | return config_parse_many_nulstr(PKGSYSCONFDIR "/pstore.conf", | |
83 | CONF_PATHS_NULSTR("systemd/pstore.conf.d"), | |
84 | "PStore\0", | |
85 | config_item_table_lookup, items, | |
86 | CONFIG_PARSE_WARN, NULL); | |
87 | } | |
88 | ||
89 | /* File list handling - PStoreEntry is the struct and | |
90 | * and PStoreEntry is the type that contains all info | |
91 | * about a pstore entry. */ | |
92 | typedef struct PStoreEntry { | |
93 | struct dirent dirent; | |
94 | bool is_binary; | |
95 | bool handled; | |
96 | char *content; | |
97 | size_t content_size; | |
98 | } PStoreEntry; | |
99 | ||
100 | typedef struct PStoreList { | |
101 | PStoreEntry *entries; | |
102 | size_t n_entries; | |
103 | size_t n_entries_allocated; | |
104 | } PStoreList; | |
105 | ||
106 | static void pstore_entries_reset(PStoreList *list) { | |
107 | for (size_t i = 0; i < list->n_entries; i++) | |
108 | free(list->entries[i].content); | |
109 | free(list->entries); | |
110 | list->n_entries = 0; | |
111 | } | |
112 | ||
113 | static int compare_pstore_entries(const void *_a, const void *_b) { | |
114 | PStoreEntry *a = (PStoreEntry *)_a, *b = (PStoreEntry *)_b; | |
115 | return strcmp(a->dirent.d_name, b->dirent.d_name); | |
116 | } | |
117 | ||
118 | static int move_file(PStoreEntry *pe, const char *subdir) { | |
119 | _cleanup_free_ char *ifd_path = NULL; | |
120 | _cleanup_free_ char *ofd_path = NULL; | |
121 | int r = 0; | |
122 | struct iovec iovec[2] = {}; | |
123 | int n_iovec = 0; | |
124 | _cleanup_free_ void *field = NULL; | |
125 | const char *suffix = NULL; | |
126 | size_t field_size; | |
127 | ||
128 | if (pe->handled) | |
129 | return 0; | |
130 | ||
131 | ifd_path = path_join(arg_sourcedir, pe->dirent.d_name); | |
132 | if (!ifd_path) | |
133 | return log_oom(); | |
134 | ||
135 | ofd_path = path_join(arg_archivedir, subdir, pe->dirent.d_name); | |
136 | if (!ofd_path) | |
137 | return log_oom(); | |
138 | ||
139 | /* Always log to the journal */ | |
140 | suffix = arg_storage == PSTORE_STORAGE_EXTERNAL ? strjoina(" moved to ", ofd_path) : (char *)"."; | |
141 | field = strjoina("MESSAGE=PStore ", pe->dirent.d_name, suffix); | |
142 | iovec[n_iovec++] = IOVEC_MAKE_STRING(field); | |
143 | ||
144 | field_size = strlen("FILE=") + pe->content_size; | |
145 | field = malloc(field_size); | |
146 | if (!field) | |
147 | return log_oom(); | |
148 | memcpy(stpcpy(field, "FILE="), pe->content, pe->content_size); | |
149 | iovec[n_iovec++] = IOVEC_MAKE(field, field_size); | |
150 | ||
151 | r = sd_journal_sendv(iovec, n_iovec); | |
152 | if (r < 0) | |
153 | return log_error_errno(r, "Failed to log pstore entry: %m"); | |
154 | ||
155 | if (arg_storage == PSTORE_STORAGE_EXTERNAL) { | |
156 | /* Move file from pstore to external storage */ | |
157 | r = mkdir_parents(ofd_path, 0755); | |
158 | if (r < 0) | |
159 | return log_error_errno(r, "Failed to create directoy %s: %m", ofd_path); | |
160 | r = copy_file_atomic(ifd_path, ofd_path, 0600, 0, 0, COPY_REPLACE); | |
161 | if (r < 0) | |
162 | return log_error_errno(r, "Failed to copy_file_atomic: %s to %s", ifd_path, ofd_path); | |
163 | } | |
164 | ||
165 | /* If file copied properly, remove it from pstore */ | |
166 | if (arg_unlink) | |
167 | (void) unlink(ifd_path); | |
168 | ||
169 | pe->handled = true; | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | static int write_dmesg(const char *dmesg, size_t size, const char *id) { | |
175 | _cleanup_(unlink_and_freep) char *ofd_path = NULL; | |
176 | _cleanup_free_ char *tmp_path = NULL; | |
177 | _cleanup_close_ int ofd = -1; | |
178 | ssize_t wr; | |
179 | int r; | |
180 | ||
181 | if (isempty(dmesg) || size == 0) | |
182 | return 0; | |
183 | ||
184 | /* log_info("Record ID %s", id); */ | |
185 | ||
186 | ofd_path = path_join(arg_archivedir, id, "dmesg.txt"); | |
187 | if (!ofd_path) | |
188 | return log_oom(); | |
189 | ||
190 | ofd = open_tmpfile_linkable(ofd_path, O_CLOEXEC|O_CREAT|O_TRUNC|O_WRONLY, &tmp_path); | |
191 | if (ofd < 0) | |
192 | return log_error_errno(ofd, "Failed to open temporary file %s: %m", ofd_path); | |
193 | wr = write(ofd, dmesg, size); | |
194 | if (wr < 0) | |
195 | return log_error_errno(errno, "Failed to store dmesg to %s: %m", ofd_path); | |
196 | if (wr != (ssize_t)size) | |
197 | return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to store dmesg to %s. %zu bytes are lost.", ofd_path, size - wr); | |
198 | r = link_tmpfile(ofd, tmp_path, ofd_path); | |
199 | if (r < 0) | |
200 | return log_error_errno(r, "Failed to write temporary file %s: %m", ofd_path); | |
201 | ofd_path = mfree(ofd_path); | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | static void process_dmesg_files(PStoreList *list) { | |
207 | /* Move files, reconstruct dmesg.txt */ | |
208 | PStoreEntry *pe; | |
209 | _cleanup_free_ char *dmesg = NULL; | |
210 | size_t dmesg_size = 0; | |
211 | _cleanup_free_ char *dmesg_id = NULL; | |
212 | ||
213 | /* Handle each dmesg file: files processed in reverse | |
214 | * order so as to properly reconstruct original dmesg */ | |
215 | for (size_t n = list->n_entries; n > 0; n--) { | |
216 | bool move_file_and_continue = false; | |
217 | _cleanup_free_ char *pe_id = NULL; | |
218 | char *p; | |
219 | size_t plen; | |
220 | ||
221 | pe = &list->entries[n-1]; | |
222 | ||
223 | if (pe->handled) | |
224 | continue; | |
225 | if (!startswith(pe->dirent.d_name, "dmesg-")) | |
226 | continue; | |
227 | ||
228 | if (endswith(pe->dirent.d_name, ".enc.z")) /* indicates a problem */ | |
229 | move_file_and_continue = true; | |
230 | p = strrchr(pe->dirent.d_name, '-'); | |
231 | if (!p) | |
232 | move_file_and_continue = true; | |
233 | ||
234 | if (move_file_and_continue) { | |
235 | /* A dmesg file on which we do NO additional processing */ | |
236 | (void) move_file(pe, NULL); | |
237 | continue; | |
238 | } | |
239 | ||
240 | /* See if this file is one of a related group of files | |
241 | * in order to reconstruct dmesg */ | |
242 | ||
243 | /* When dmesg is written into pstore, it is done so in | |
244 | * small chunks, whatever the exchange buffer size is | |
245 | * with the underlying pstore backend (ie. EFI may be | |
246 | * ~2KiB), which means an example pstore with approximately | |
247 | * 64KB of storage may have up to roughly 32 dmesg files | |
248 | * that could be related, depending upon the size of the | |
249 | * original dmesg. | |
250 | * | |
251 | * Here we look at the dmesg filename and try to discern | |
252 | * if files are part of a related group, meaning the same | |
253 | * original dmesg. | |
254 | * | |
255 | * The two known pstore backends are EFI and ERST. These | |
256 | * backends store data in the Common Platform Error | |
257 | * Record, CPER, format. The dmesg- filename contains the | |
258 | * CPER record id, a 64bit number (in decimal notation). | |
259 | * In Linux, the record id is encoded with two digits for | |
260 | * the dmesg part (chunk) number and 3 digits for the | |
261 | * count number. So allowing an additional digit to | |
262 | * compensate for advancing time, this code ignores the | |
263 | * last six digits of the filename in determining the | |
264 | * record id. | |
265 | * | |
266 | * For the EFI backend, the record id encodes an id in the | |
267 | * upper 32 bits, and a timestamp in the lower 32-bits. | |
268 | * So ignoring the least significant 6 digits has proven | |
269 | * to generally identify related dmesg entries. */ | |
270 | #define PSTORE_FILENAME_IGNORE 6 | |
271 | ||
272 | /* determine common portion of record id */ | |
273 | ++p; /* move beyond dmesg- */ | |
274 | plen = strlen(p); | |
275 | if (plen > PSTORE_FILENAME_IGNORE) { | |
276 | pe_id = memdup_suffix0(p, plen - PSTORE_FILENAME_IGNORE); | |
277 | if (!pe_id) { | |
278 | log_oom(); | |
279 | return; | |
280 | } | |
281 | } else | |
282 | pe_id = mfree(pe_id); | |
283 | ||
284 | /* Now move file from pstore to archive storage */ | |
285 | move_file(pe, pe_id); | |
286 | ||
287 | /* If the current record id is NOT the same as the | |
288 | * previous record id, then start a new dmesg.txt file */ | |
289 | if (!pe_id || !dmesg_id || !streq(pe_id, dmesg_id)) { | |
290 | /* Encountered a new dmesg group, close out old one, open new one */ | |
291 | if (dmesg) { | |
292 | (void) write_dmesg(dmesg, dmesg_size, dmesg_id); | |
293 | dmesg = mfree(dmesg); | |
294 | dmesg_size = 0; | |
295 | } | |
296 | ||
297 | /* now point dmesg_id to storage of pe_id */ | |
298 | free_and_replace(dmesg_id, pe_id); | |
299 | } | |
300 | ||
301 | /* Reconstruction of dmesg is done as a useful courtesy, do not log errors */ | |
302 | dmesg = realloc(dmesg, dmesg_size + strlen(pe->dirent.d_name) + strlen(":\n") + pe->content_size + 1); | |
303 | if (dmesg) { | |
304 | dmesg_size += sprintf(&dmesg[dmesg_size], "%s:\n", pe->dirent.d_name); | |
305 | if (pe->content) { | |
306 | memcpy(&dmesg[dmesg_size], pe->content, pe->content_size); | |
307 | dmesg_size += pe->content_size; | |
308 | } | |
309 | } | |
310 | ||
311 | pe_id = mfree(pe_id); | |
312 | } | |
313 | if (dmesg) | |
314 | (void) write_dmesg(dmesg, dmesg_size, dmesg_id); | |
315 | } | |
316 | ||
317 | static int list_files(PStoreList *list, const char *sourcepath) { | |
318 | _cleanup_(closedirp) DIR *dirp = NULL; | |
319 | struct dirent *de; | |
320 | int r = 0; | |
321 | ||
322 | dirp = opendir(sourcepath); | |
323 | if (!dirp) | |
324 | return log_error_errno(errno, "Failed to opendir %s: %m", sourcepath); | |
325 | ||
326 | FOREACH_DIRENT(de, dirp, return log_error_errno(errno, "Failed to iterate through %s: %m", sourcepath)) { | |
327 | _cleanup_free_ char *ifd_path = NULL; | |
328 | ||
329 | ifd_path = path_join(sourcepath, de->d_name); | |
330 | if (!ifd_path) | |
331 | return log_oom(); | |
332 | ||
333 | _cleanup_free_ char *buf = NULL; | |
334 | size_t buf_size; | |
335 | ||
336 | /* Now read contents of pstore file */ | |
337 | r = read_full_file(ifd_path, &buf, &buf_size); | |
338 | if (r < 0) { | |
339 | log_warning_errno(r, "Failed to read file %s: %m", ifd_path); | |
340 | continue; | |
341 | } | |
342 | ||
343 | if (!GREEDY_REALLOC(list->entries, list->n_entries_allocated, list->n_entries + 1)) | |
344 | return log_oom(); | |
345 | ||
346 | list->entries[list->n_entries++] = (PStoreEntry) { | |
347 | .dirent = *de, | |
348 | .content = TAKE_PTR(buf), | |
349 | .content_size = buf_size, | |
350 | .is_binary = true, | |
351 | .handled = false, | |
352 | }; | |
353 | } | |
354 | ||
355 | return r; | |
356 | } | |
357 | ||
358 | static int run(int argc, char *argv[]) { | |
359 | _cleanup_(pstore_entries_reset) PStoreList list = {}; | |
360 | int r; | |
361 | ||
362 | log_open(); | |
363 | ||
22d6bea8 ZJS |
364 | if (argc > 1) |
365 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
366 | "This program takes no arguments."); | |
367 | ||
9b4abc69 ED |
368 | /* Ignore all parse errors */ |
369 | (void) parse_config(); | |
370 | ||
371 | log_debug("Selected storage '%s'.", pstore_storage_to_string(arg_storage)); | |
372 | log_debug("Selected Unlink '%d'.", arg_unlink); | |
373 | ||
374 | if (arg_storage == PSTORE_STORAGE_NONE) | |
375 | /* Do nothing, intentionally, leaving pstore untouched */ | |
376 | return 0; | |
377 | ||
378 | /* Obtain list of files in pstore */ | |
379 | r = list_files(&list, arg_sourcedir); | |
380 | if (r < 0) | |
381 | return r; | |
382 | ||
383 | /* Handle each pstore file */ | |
384 | /* Sort files lexigraphically ascending, generally needed by all */ | |
385 | qsort_safe(list.entries, list.n_entries, sizeof(PStoreEntry), compare_pstore_entries); | |
386 | ||
387 | /* Process known file types */ | |
388 | process_dmesg_files(&list); | |
389 | ||
390 | /* Move left over files out of pstore */ | |
391 | for (size_t n = 0; n < list.n_entries; n++) | |
392 | move_file(&list.entries[n], NULL); | |
393 | ||
394 | return 0; | |
395 | } | |
396 | ||
397 | DEFINE_MAIN_FUNCTION(run); |