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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
b18453ed | 2 | |
dccca82b | 3 | #include <errno.h> |
b18453ed ZJS |
4 | #include <unistd.h> |
5 | ||
6 | #include "alloc-util.h" | |
b778252b | 7 | #include "escape.h" |
b18453ed | 8 | #include "fd-util.h" |
e6a7ec4b | 9 | #include "io-util.h" |
41b0b127 | 10 | #include "journal-file.h" |
e6a7ec4b | 11 | #include "journal-importer.h" |
1e448731 | 12 | #include "journal-util.h" |
b18453ed ZJS |
13 | #include "parse-util.h" |
14 | #include "string-util.h" | |
f652c62d | 15 | #include "unaligned.h" |
b18453ed ZJS |
16 | |
17 | enum { | |
18 | IMPORTER_STATE_LINE = 0, /* waiting to read, or reading line */ | |
19 | IMPORTER_STATE_DATA_START, /* reading binary data header */ | |
20 | IMPORTER_STATE_DATA, /* reading binary data */ | |
21 | IMPORTER_STATE_DATA_FINISH, /* expecting newline */ | |
22 | IMPORTER_STATE_EOF, /* done */ | |
23 | }; | |
24 | ||
25 | static int iovw_put(struct iovec_wrapper *iovw, void* data, size_t len) { | |
ef4d6abe ZJS |
26 | if (iovw->count >= ENTRY_FIELD_COUNT_MAX) |
27 | return -E2BIG; | |
28 | ||
b18453ed ZJS |
29 | if (!GREEDY_REALLOC(iovw->iovec, iovw->size_bytes, iovw->count + 1)) |
30 | return log_oom(); | |
31 | ||
e6a7ec4b | 32 | iovw->iovec[iovw->count++] = IOVEC_MAKE(data, len); |
b18453ed ZJS |
33 | return 0; |
34 | } | |
35 | ||
36 | static void iovw_free_contents(struct iovec_wrapper *iovw) { | |
37 | iovw->iovec = mfree(iovw->iovec); | |
38 | iovw->size_bytes = iovw->count = 0; | |
39 | } | |
40 | ||
41 | static void iovw_rebase(struct iovec_wrapper *iovw, char *old, char *new) { | |
42 | size_t i; | |
43 | ||
44 | for (i = 0; i < iovw->count; i++) | |
45 | iovw->iovec[i].iov_base = (char*) iovw->iovec[i].iov_base - old + new; | |
46 | } | |
47 | ||
48 | size_t iovw_size(struct iovec_wrapper *iovw) { | |
49 | size_t n = 0, i; | |
50 | ||
51 | for (i = 0; i < iovw->count; i++) | |
52 | n += iovw->iovec[i].iov_len; | |
53 | ||
54 | return n; | |
55 | } | |
56 | ||
57 | void journal_importer_cleanup(JournalImporter *imp) { | |
58 | if (imp->fd >= 0 && !imp->passive_fd) { | |
59 | log_debug("Closing %s (fd=%d)", imp->name ?: "importer", imp->fd); | |
60 | safe_close(imp->fd); | |
61 | } | |
62 | ||
2ddb70d2 | 63 | free(imp->name); |
b18453ed ZJS |
64 | free(imp->buf); |
65 | iovw_free_contents(&imp->iovw); | |
66 | } | |
67 | ||
68 | static char* realloc_buffer(JournalImporter *imp, size_t size) { | |
69 | char *b, *old = imp->buf; | |
70 | ||
71 | b = GREEDY_REALLOC(imp->buf, imp->size, size); | |
72 | if (!b) | |
73 | return NULL; | |
74 | ||
75 | iovw_rebase(&imp->iovw, old, imp->buf); | |
76 | ||
77 | return b; | |
78 | } | |
79 | ||
80 | static int get_line(JournalImporter *imp, char **line, size_t *size) { | |
81 | ssize_t n; | |
82 | char *c = NULL; | |
83 | ||
84 | assert(imp); | |
85 | assert(imp->state == IMPORTER_STATE_LINE); | |
86 | assert(imp->offset <= imp->filled); | |
87 | assert(imp->filled <= imp->size); | |
234519ae | 88 | assert(!imp->buf || imp->size > 0); |
b18453ed ZJS |
89 | assert(imp->fd >= 0); |
90 | ||
91 | for (;;) { | |
92 | if (imp->buf) { | |
93 | size_t start = MAX(imp->scanned, imp->offset); | |
94 | ||
95 | c = memchr(imp->buf + start, '\n', | |
96 | imp->filled - start); | |
97 | if (c != NULL) | |
98 | break; | |
99 | } | |
100 | ||
101 | imp->scanned = imp->filled; | |
baaa35ad | 102 | if (imp->scanned >= DATA_SIZE_MAX) |
ef4d6abe | 103 | return log_error_errno(SYNTHETIC_ERRNO(ENOBUFS), |
baaa35ad ZJS |
104 | "Entry is bigger than %u bytes.", |
105 | DATA_SIZE_MAX); | |
b18453ed ZJS |
106 | |
107 | if (imp->passive_fd) | |
108 | /* we have to wait for some data to come to us */ | |
109 | return -EAGAIN; | |
110 | ||
111 | /* We know that imp->filled is at most DATA_SIZE_MAX, so if | |
112 | we reallocate it, we'll increase the size at least a bit. */ | |
113 | assert_cc(DATA_SIZE_MAX < ENTRY_SIZE_MAX); | |
114 | if (imp->size - imp->filled < LINE_CHUNK && | |
115 | !realloc_buffer(imp, MIN(imp->filled + LINE_CHUNK, ENTRY_SIZE_MAX))) | |
116 | return log_oom(); | |
117 | ||
118 | assert(imp->buf); | |
119 | assert(imp->size - imp->filled >= LINE_CHUNK || | |
120 | imp->size == ENTRY_SIZE_MAX); | |
121 | ||
122 | n = read(imp->fd, | |
123 | imp->buf + imp->filled, | |
124 | imp->size - imp->filled); | |
125 | if (n < 0) { | |
126 | if (errno != EAGAIN) | |
127 | log_error_errno(errno, "read(%d, ..., %zu): %m", | |
128 | imp->fd, | |
129 | imp->size - imp->filled); | |
130 | return -errno; | |
131 | } else if (n == 0) | |
132 | return 0; | |
133 | ||
134 | imp->filled += n; | |
135 | } | |
136 | ||
137 | *line = imp->buf + imp->offset; | |
138 | *size = c + 1 - imp->buf - imp->offset; | |
139 | imp->offset += *size; | |
140 | ||
141 | return 1; | |
142 | } | |
143 | ||
144 | static int fill_fixed_size(JournalImporter *imp, void **data, size_t size) { | |
145 | ||
146 | assert(imp); | |
3742095b | 147 | assert(IN_SET(imp->state, IMPORTER_STATE_DATA_START, IMPORTER_STATE_DATA, IMPORTER_STATE_DATA_FINISH)); |
b18453ed ZJS |
148 | assert(size <= DATA_SIZE_MAX); |
149 | assert(imp->offset <= imp->filled); | |
150 | assert(imp->filled <= imp->size); | |
234519ae LP |
151 | assert(imp->buf || imp->size == 0); |
152 | assert(!imp->buf || imp->size > 0); | |
b18453ed ZJS |
153 | assert(imp->fd >= 0); |
154 | assert(data); | |
155 | ||
156 | while (imp->filled - imp->offset < size) { | |
157 | int n; | |
158 | ||
159 | if (imp->passive_fd) | |
160 | /* we have to wait for some data to come to us */ | |
161 | return -EAGAIN; | |
162 | ||
163 | if (!realloc_buffer(imp, imp->offset + size)) | |
164 | return log_oom(); | |
165 | ||
166 | n = read(imp->fd, imp->buf + imp->filled, | |
167 | imp->size - imp->filled); | |
168 | if (n < 0) { | |
169 | if (errno != EAGAIN) | |
170 | log_error_errno(errno, "read(%d, ..., %zu): %m", imp->fd, | |
171 | imp->size - imp->filled); | |
172 | return -errno; | |
173 | } else if (n == 0) | |
174 | return 0; | |
175 | ||
176 | imp->filled += n; | |
177 | } | |
178 | ||
179 | *data = imp->buf + imp->offset; | |
180 | imp->offset += size; | |
181 | ||
182 | return 1; | |
183 | } | |
184 | ||
185 | static int get_data_size(JournalImporter *imp) { | |
186 | int r; | |
187 | void *data; | |
188 | ||
189 | assert(imp); | |
190 | assert(imp->state == IMPORTER_STATE_DATA_START); | |
191 | assert(imp->data_size == 0); | |
192 | ||
193 | r = fill_fixed_size(imp, &data, sizeof(uint64_t)); | |
194 | if (r <= 0) | |
195 | return r; | |
196 | ||
f652c62d | 197 | imp->data_size = unaligned_read_le64(data); |
baaa35ad ZJS |
198 | if (imp->data_size > DATA_SIZE_MAX) |
199 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
200 | "Stream declares field with size %zu > DATA_SIZE_MAX = %u", | |
201 | imp->data_size, DATA_SIZE_MAX); | |
b18453ed ZJS |
202 | if (imp->data_size == 0) |
203 | log_warning("Binary field with zero length"); | |
204 | ||
205 | return 1; | |
206 | } | |
207 | ||
208 | static int get_data_data(JournalImporter *imp, void **data) { | |
209 | int r; | |
210 | ||
211 | assert(imp); | |
212 | assert(data); | |
213 | assert(imp->state == IMPORTER_STATE_DATA); | |
214 | ||
215 | r = fill_fixed_size(imp, data, imp->data_size); | |
216 | if (r <= 0) | |
217 | return r; | |
218 | ||
219 | return 1; | |
220 | } | |
221 | ||
222 | static int get_data_newline(JournalImporter *imp) { | |
223 | int r; | |
224 | char *data; | |
225 | ||
226 | assert(imp); | |
227 | assert(imp->state == IMPORTER_STATE_DATA_FINISH); | |
228 | ||
229 | r = fill_fixed_size(imp, (void**) &data, 1); | |
230 | if (r <= 0) | |
231 | return r; | |
232 | ||
233 | assert(data); | |
234 | if (*data != '\n') { | |
b778252b ZJS |
235 | char buf[4]; |
236 | int l; | |
237 | ||
238 | l = cescape_char(*data, buf); | |
baaa35ad ZJS |
239 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
240 | "Expected newline, got '%.*s'", l, buf); | |
b18453ed ZJS |
241 | } |
242 | ||
243 | return 1; | |
244 | } | |
245 | ||
c0b6ada7 ZJS |
246 | static int process_special_field(JournalImporter *imp, char *line) { |
247 | const char *value; | |
cca24fc3 | 248 | char buf[CELLESCAPE_DEFAULT_LENGTH]; |
b18453ed ZJS |
249 | int r; |
250 | ||
251 | assert(line); | |
b18453ed | 252 | |
c0b6ada7 ZJS |
253 | value = startswith(line, "__CURSOR="); |
254 | if (value) | |
b18453ed ZJS |
255 | /* ignore __CURSOR */ |
256 | return 1; | |
257 | ||
c0b6ada7 ZJS |
258 | value = startswith(line, "__REALTIME_TIMESTAMP="); |
259 | if (value) { | |
41b0b127 | 260 | uint64_t x; |
cca24fc3 | 261 | |
c0b6ada7 | 262 | r = safe_atou64(value, &x); |
b18453ed | 263 | if (r < 0) |
cca24fc3 | 264 | return log_warning_errno(r, "Failed to parse __REALTIME_TIMESTAMP '%s': %m", |
c0b6ada7 | 265 | cellescape(buf, sizeof buf, value)); |
41b0b127 ZJS |
266 | else if (!VALID_REALTIME(x)) { |
267 | log_warning("__REALTIME_TIMESTAMP out of range, ignoring: %"PRIu64, x); | |
268 | return -ERANGE; | |
269 | } | |
270 | ||
271 | imp->ts.realtime = x; | |
272 | return 1; | |
b18453ed ZJS |
273 | } |
274 | ||
c0b6ada7 ZJS |
275 | value = startswith(line, "__MONOTONIC_TIMESTAMP="); |
276 | if (value) { | |
41b0b127 | 277 | uint64_t x; |
cca24fc3 | 278 | |
c0b6ada7 | 279 | r = safe_atou64(value, &x); |
b18453ed | 280 | if (r < 0) |
cca24fc3 | 281 | return log_warning_errno(r, "Failed to parse __MONOTONIC_TIMESTAMP '%s': %m", |
c0b6ada7 | 282 | cellescape(buf, sizeof buf, value)); |
41b0b127 ZJS |
283 | else if (!VALID_MONOTONIC(x)) { |
284 | log_warning("__MONOTONIC_TIMESTAMP out of range, ignoring: %"PRIu64, x); | |
285 | return -ERANGE; | |
286 | } | |
287 | ||
288 | imp->ts.monotonic = x; | |
289 | return 1; | |
b18453ed ZJS |
290 | } |
291 | ||
c0b6ada7 ZJS |
292 | /* Just a single underline, but it needs special treatment too. */ |
293 | value = startswith(line, "_BOOT_ID="); | |
294 | if (value) { | |
295 | r = sd_id128_from_string(value, &imp->boot_id); | |
296 | if (r < 0) | |
297 | return log_warning_errno(r, "Failed to parse _BOOT_ID '%s': %m", | |
298 | cellescape(buf, sizeof buf, value)); | |
299 | ||
300 | /* store the field in the usual fashion too */ | |
301 | return 0; | |
302 | } | |
303 | ||
304 | value = startswith(line, "__"); | |
305 | if (value) { | |
306 | log_notice("Unknown dunder line __%s, ignoring.", cellescape(buf, sizeof buf, value)); | |
b18453ed ZJS |
307 | return 1; |
308 | } | |
309 | ||
310 | /* no dunder */ | |
311 | return 0; | |
312 | } | |
313 | ||
314 | int journal_importer_process_data(JournalImporter *imp) { | |
315 | int r; | |
316 | ||
317 | switch(imp->state) { | |
318 | case IMPORTER_STATE_LINE: { | |
319 | char *line, *sep; | |
320 | size_t n = 0; | |
321 | ||
322 | assert(imp->data_size == 0); | |
323 | ||
324 | r = get_line(imp, &line, &n); | |
325 | if (r < 0) | |
326 | return r; | |
327 | if (r == 0) { | |
328 | imp->state = IMPORTER_STATE_EOF; | |
d74dc4f2 | 329 | return 0; |
b18453ed ZJS |
330 | } |
331 | assert(n > 0); | |
332 | assert(line[n-1] == '\n'); | |
333 | ||
334 | if (n == 1) { | |
335 | log_trace("Received empty line, event is ready"); | |
336 | return 1; | |
337 | } | |
338 | ||
b18453ed ZJS |
339 | /* MESSAGE=xxx\n |
340 | or | |
341 | COREDUMP\n | |
342 | LLLLLLLL0011223344...\n | |
343 | */ | |
344 | sep = memchr(line, '=', n); | |
345 | if (sep) { | |
346 | /* chomp newline */ | |
347 | n--; | |
348 | ||
1e448731 ZJS |
349 | if (!journal_field_valid(line, sep - line, true)) { |
350 | char buf[64], *t; | |
351 | ||
352 | t = strndupa(line, sep - line); | |
353 | log_debug("Ignoring invalid field: \"%s\"", | |
c0b6ada7 | 354 | cellescape(buf, sizeof buf, t)); |
1e448731 ZJS |
355 | |
356 | return 0; | |
357 | } | |
358 | ||
bcac9822 | 359 | line[n] = '\0'; |
c0b6ada7 | 360 | r = process_special_field(imp, line); |
bcac9822 ZJS |
361 | if (r != 0) |
362 | return r < 0 ? r : 0; | |
363 | ||
b18453ed ZJS |
364 | r = iovw_put(&imp->iovw, line, n); |
365 | if (r < 0) | |
366 | return r; | |
367 | } else { | |
368 | /* replace \n with = */ | |
369 | line[n-1] = '='; | |
370 | ||
371 | imp->field_len = n; | |
372 | imp->state = IMPORTER_STATE_DATA_START; | |
373 | ||
374 | /* we cannot put the field in iovec until we have all data */ | |
375 | } | |
376 | ||
377 | log_trace("Received: %.*s (%s)", (int) n, line, sep ? "text" : "binary"); | |
378 | ||
379 | return 0; /* continue */ | |
380 | } | |
381 | ||
382 | case IMPORTER_STATE_DATA_START: | |
383 | assert(imp->data_size == 0); | |
384 | ||
385 | r = get_data_size(imp); | |
386 | // log_debug("get_data_size() -> %d", r); | |
387 | if (r < 0) | |
388 | return r; | |
389 | if (r == 0) { | |
390 | imp->state = IMPORTER_STATE_EOF; | |
391 | return 0; | |
392 | } | |
393 | ||
394 | imp->state = imp->data_size > 0 ? | |
395 | IMPORTER_STATE_DATA : IMPORTER_STATE_DATA_FINISH; | |
396 | ||
397 | return 0; /* continue */ | |
398 | ||
399 | case IMPORTER_STATE_DATA: { | |
400 | void *data; | |
401 | char *field; | |
402 | ||
403 | assert(imp->data_size > 0); | |
404 | ||
405 | r = get_data_data(imp, &data); | |
406 | // log_debug("get_data_data() -> %d", r); | |
407 | if (r < 0) | |
408 | return r; | |
409 | if (r == 0) { | |
410 | imp->state = IMPORTER_STATE_EOF; | |
411 | return 0; | |
412 | } | |
413 | ||
414 | assert(data); | |
415 | ||
416 | field = (char*) data - sizeof(uint64_t) - imp->field_len; | |
417 | memmove(field + sizeof(uint64_t), field, imp->field_len); | |
418 | ||
419 | r = iovw_put(&imp->iovw, field + sizeof(uint64_t), imp->field_len + imp->data_size); | |
420 | if (r < 0) | |
421 | return r; | |
422 | ||
423 | imp->state = IMPORTER_STATE_DATA_FINISH; | |
424 | ||
425 | return 0; /* continue */ | |
426 | } | |
427 | ||
428 | case IMPORTER_STATE_DATA_FINISH: | |
429 | r = get_data_newline(imp); | |
430 | // log_debug("get_data_newline() -> %d", r); | |
431 | if (r < 0) | |
432 | return r; | |
433 | if (r == 0) { | |
434 | imp->state = IMPORTER_STATE_EOF; | |
435 | return 0; | |
436 | } | |
437 | ||
438 | imp->data_size = 0; | |
439 | imp->state = IMPORTER_STATE_LINE; | |
440 | ||
441 | return 0; /* continue */ | |
442 | default: | |
443 | assert_not_reached("wtf?"); | |
444 | } | |
445 | } | |
446 | ||
447 | int journal_importer_push_data(JournalImporter *imp, const char *data, size_t size) { | |
448 | assert(imp); | |
449 | assert(imp->state != IMPORTER_STATE_EOF); | |
450 | ||
baaa35ad ZJS |
451 | if (!realloc_buffer(imp, imp->filled + size)) |
452 | return log_error_errno(SYNTHETIC_ERRNO(ENOMEM), | |
453 | "Failed to store received data of size %zu " | |
454 | "(in addition to existing %zu bytes with %zu filled): %s", | |
455 | size, imp->size, imp->filled, | |
456 | strerror(ENOMEM)); | |
b18453ed ZJS |
457 | |
458 | memcpy(imp->buf + imp->filled, data, size); | |
459 | imp->filled += size; | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | void journal_importer_drop_iovw(JournalImporter *imp) { | |
465 | size_t remain, target; | |
466 | ||
467 | /* This function drops processed data that along with the iovw that points at it */ | |
468 | ||
469 | iovw_free_contents(&imp->iovw); | |
470 | ||
471 | /* possibly reset buffer position */ | |
472 | remain = imp->filled - imp->offset; | |
473 | ||
474 | if (remain == 0) /* no brainer */ | |
475 | imp->offset = imp->scanned = imp->filled = 0; | |
476 | else if (imp->offset > imp->size - imp->filled && | |
477 | imp->offset > remain) { | |
478 | memcpy(imp->buf, imp->buf + imp->offset, remain); | |
479 | imp->offset = imp->scanned = 0; | |
480 | imp->filled = remain; | |
481 | } | |
482 | ||
483 | target = imp->size; | |
484 | while (target > 16 * LINE_CHUNK && imp->filled < target / 2) | |
485 | target /= 2; | |
486 | if (target < imp->size) { | |
487 | char *tmp; | |
488 | ||
489 | tmp = realloc(imp->buf, target); | |
490 | if (!tmp) | |
491 | log_warning("Failed to reallocate buffer to (smaller) size %zu", | |
492 | target); | |
493 | else { | |
494 | log_debug("Reallocated buffer from %zu to %zu bytes", | |
495 | imp->size, target); | |
496 | imp->buf = tmp; | |
497 | imp->size = target; | |
498 | } | |
499 | } | |
500 | } | |
501 | ||
502 | bool journal_importer_eof(const JournalImporter *imp) { | |
503 | return imp->state == IMPORTER_STATE_EOF; | |
504 | } |