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b5efdb8a LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2014 Zbigniew Jędrzejewski-Szmek | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
eacbb4d3 | 20 | #include <curl/curl.h> |
cf0fbc49 | 21 | #include <stdbool.h> |
eacbb4d3 | 22 | |
b5efdb8a LP |
23 | #include "alloc-util.h" |
24 | #include "journal-upload.h" | |
eacbb4d3 ZJS |
25 | #include "log.h" |
26 | #include "utf8.h" | |
b5efdb8a | 27 | #include "util.h" |
d79ca7a6 | 28 | #include "sd-daemon.h" |
eacbb4d3 ZJS |
29 | |
30 | /** | |
31 | * Write up to size bytes to buf. Return negative on error, and number of | |
32 | * bytes written otherwise. The last case is a kind of an error too. | |
33 | */ | |
34 | static ssize_t write_entry(char *buf, size_t size, Uploader *u) { | |
35 | int r; | |
36 | size_t pos = 0; | |
37 | ||
38 | assert(size <= SSIZE_MAX); | |
39 | ||
57255510 | 40 | for (;;) { |
eacbb4d3 ZJS |
41 | |
42 | switch(u->entry_state) { | |
43 | case ENTRY_CURSOR: { | |
a1e58e8e | 44 | u->current_cursor = mfree(u->current_cursor); |
eacbb4d3 | 45 | |
722b6795 | 46 | r = sd_journal_get_cursor(u->journal, &u->current_cursor); |
eb56eb9b MS |
47 | if (r < 0) |
48 | return log_error_errno(r, "Failed to get cursor: %m"); | |
eacbb4d3 ZJS |
49 | |
50 | r = snprintf(buf + pos, size - pos, | |
722b6795 | 51 | "__CURSOR=%s\n", u->current_cursor); |
eacbb4d3 ZJS |
52 | if (pos + r > size) |
53 | /* not enough space */ | |
54 | return pos; | |
55 | ||
313cefa1 | 56 | u->entry_state++; |
eacbb4d3 ZJS |
57 | |
58 | if (pos + r == size) { | |
59 | /* exactly one character short, but we don't need it */ | |
60 | buf[size - 1] = '\n'; | |
61 | return size; | |
62 | } | |
63 | ||
64 | pos += r; | |
65 | } /* fall through */ | |
66 | ||
67 | case ENTRY_REALTIME: { | |
68 | usec_t realtime; | |
69 | ||
70 | r = sd_journal_get_realtime_usec(u->journal, &realtime); | |
eb56eb9b MS |
71 | if (r < 0) |
72 | return log_error_errno(r, "Failed to get realtime timestamp: %m"); | |
eacbb4d3 ZJS |
73 | |
74 | r = snprintf(buf + pos, size - pos, | |
75 | "__REALTIME_TIMESTAMP="USEC_FMT"\n", realtime); | |
76 | if (r + pos > size) | |
77 | /* not enough space */ | |
78 | return pos; | |
79 | ||
313cefa1 | 80 | u->entry_state++; |
eacbb4d3 ZJS |
81 | |
82 | if (r + pos == size) { | |
83 | /* exactly one character short, but we don't need it */ | |
84 | buf[size - 1] = '\n'; | |
85 | return size; | |
86 | } | |
87 | ||
88 | pos += r; | |
89 | } /* fall through */ | |
90 | ||
91 | case ENTRY_MONOTONIC: { | |
92 | usec_t monotonic; | |
93 | sd_id128_t boot_id; | |
94 | ||
95 | r = sd_journal_get_monotonic_usec(u->journal, &monotonic, &boot_id); | |
eb56eb9b MS |
96 | if (r < 0) |
97 | return log_error_errno(r, "Failed to get monotonic timestamp: %m"); | |
eacbb4d3 ZJS |
98 | |
99 | r = snprintf(buf + pos, size - pos, | |
100 | "__MONOTONIC_TIMESTAMP="USEC_FMT"\n", monotonic); | |
101 | if (r + pos > size) | |
102 | /* not enough space */ | |
103 | return pos; | |
104 | ||
313cefa1 | 105 | u->entry_state++; |
eacbb4d3 ZJS |
106 | |
107 | if (r + pos == size) { | |
108 | /* exactly one character short, but we don't need it */ | |
109 | buf[size - 1] = '\n'; | |
110 | return size; | |
111 | } | |
112 | ||
113 | pos += r; | |
114 | } /* fall through */ | |
115 | ||
116 | case ENTRY_BOOT_ID: { | |
117 | sd_id128_t boot_id; | |
118 | char sid[33]; | |
119 | ||
120 | r = sd_journal_get_monotonic_usec(u->journal, NULL, &boot_id); | |
eb56eb9b MS |
121 | if (r < 0) |
122 | return log_error_errno(r, "Failed to get monotonic timestamp: %m"); | |
eacbb4d3 ZJS |
123 | |
124 | r = snprintf(buf + pos, size - pos, | |
125 | "_BOOT_ID=%s\n", sd_id128_to_string(boot_id, sid)); | |
5ffa8c81 | 126 | if (r + pos > size) |
eacbb4d3 ZJS |
127 | /* not enough space */ |
128 | return pos; | |
129 | ||
313cefa1 | 130 | u->entry_state++; |
eacbb4d3 ZJS |
131 | |
132 | if (r + pos == size) { | |
133 | /* exactly one character short, but we don't need it */ | |
134 | buf[size - 1] = '\n'; | |
135 | return size; | |
136 | } | |
137 | ||
138 | pos += r; | |
139 | } /* fall through */ | |
140 | ||
141 | case ENTRY_NEW_FIELD: { | |
142 | u->field_pos = 0; | |
143 | ||
144 | r = sd_journal_enumerate_data(u->journal, | |
145 | &u->field_data, | |
146 | &u->field_length); | |
eb56eb9b MS |
147 | if (r < 0) |
148 | return log_error_errno(r, "Failed to move to next field in entry: %m"); | |
149 | else if (r == 0) { | |
eacbb4d3 ZJS |
150 | u->entry_state = ENTRY_OUTRO; |
151 | continue; | |
152 | } | |
153 | ||
154 | if (!utf8_is_printable_newline(u->field_data, | |
155 | u->field_length, false)) { | |
156 | u->entry_state = ENTRY_BINARY_FIELD_START; | |
157 | continue; | |
158 | } | |
159 | ||
313cefa1 | 160 | u->entry_state++; |
eacbb4d3 ZJS |
161 | } /* fall through */ |
162 | ||
163 | case ENTRY_TEXT_FIELD: | |
164 | case ENTRY_BINARY_FIELD: { | |
165 | bool done; | |
166 | size_t tocopy; | |
167 | ||
168 | done = size - pos > u->field_length - u->field_pos; | |
169 | if (done) | |
170 | tocopy = u->field_length - u->field_pos; | |
171 | else | |
172 | tocopy = size - pos; | |
173 | ||
174 | memcpy(buf + pos, | |
175 | (char*) u->field_data + u->field_pos, | |
176 | tocopy); | |
177 | ||
178 | if (done) { | |
179 | buf[pos + tocopy] = '\n'; | |
180 | pos += tocopy + 1; | |
181 | u->entry_state = ENTRY_NEW_FIELD; | |
182 | continue; | |
183 | } else { | |
184 | u->field_pos += tocopy; | |
185 | return size; | |
186 | } | |
187 | } | |
188 | ||
189 | case ENTRY_BINARY_FIELD_START: { | |
190 | const char *c; | |
191 | size_t len; | |
192 | ||
193 | c = memchr(u->field_data, '=', u->field_length); | |
194 | if (!c || c == u->field_data) { | |
195 | log_error("Invalid field."); | |
196 | return -EINVAL; | |
197 | } | |
198 | ||
199 | len = c - (const char*)u->field_data; | |
200 | ||
201 | /* need space for label + '\n' */ | |
202 | if (size - pos < len + 1) | |
203 | return pos; | |
204 | ||
205 | memcpy(buf + pos, u->field_data, len); | |
206 | buf[pos + len] = '\n'; | |
207 | pos += len + 1; | |
208 | ||
209 | u->field_pos = len + 1; | |
313cefa1 | 210 | u->entry_state++; |
eacbb4d3 ZJS |
211 | } /* fall through */ |
212 | ||
213 | case ENTRY_BINARY_FIELD_SIZE: { | |
214 | uint64_t le64; | |
215 | ||
216 | /* need space for uint64_t */ | |
217 | if (size - pos < 8) | |
218 | return pos; | |
219 | ||
220 | le64 = htole64(u->field_length - u->field_pos); | |
221 | memcpy(buf + pos, &le64, 8); | |
222 | pos += 8; | |
223 | ||
313cefa1 | 224 | u->entry_state++; |
eacbb4d3 ZJS |
225 | continue; |
226 | } | |
227 | ||
228 | case ENTRY_OUTRO: | |
229 | /* need space for '\n' */ | |
230 | if (size - pos < 1) | |
231 | return pos; | |
232 | ||
233 | buf[pos++] = '\n'; | |
313cefa1 VC |
234 | u->entry_state++; |
235 | u->entries_sent++; | |
eacbb4d3 ZJS |
236 | |
237 | return pos; | |
238 | ||
239 | default: | |
240 | assert_not_reached("WTF?"); | |
241 | } | |
242 | } | |
243 | assert_not_reached("WTF?"); | |
244 | } | |
245 | ||
d79ca7a6 | 246 | static inline void check_update_watchdog(Uploader *u) { |
d79ca7a6 KC |
247 | usec_t after; |
248 | usec_t elapsed_time; | |
249 | ||
0aa176a7 | 250 | if (u->watchdog_usec <= 0) |
d79ca7a6 | 251 | return; |
0aa176a7 ZJS |
252 | |
253 | after = now(CLOCK_MONOTONIC); | |
254 | elapsed_time = usec_sub(after, u->watchdog_timestamp); | |
255 | if (elapsed_time > u->watchdog_usec / 2) { | |
256 | log_debug("Update watchdog timer"); | |
257 | sd_notify(false, "WATCHDOG=1"); | |
258 | u->watchdog_timestamp = after; | |
d79ca7a6 KC |
259 | } |
260 | } | |
261 | ||
eacbb4d3 ZJS |
262 | static size_t journal_input_callback(void *buf, size_t size, size_t nmemb, void *userp) { |
263 | Uploader *u = userp; | |
264 | int r; | |
265 | sd_journal *j; | |
266 | size_t filled = 0; | |
267 | ssize_t w; | |
268 | ||
269 | assert(u); | |
270 | assert(nmemb <= SSIZE_MAX / size); | |
271 | ||
d79ca7a6 KC |
272 | check_update_watchdog(u); |
273 | ||
eacbb4d3 ZJS |
274 | j = u->journal; |
275 | ||
276 | while (j && filled < size * nmemb) { | |
277 | if (u->entry_state == ENTRY_DONE) { | |
278 | r = sd_journal_next(j); | |
279 | if (r < 0) { | |
c33b3297 | 280 | log_error_errno(r, "Failed to move to next entry in journal: %m"); |
eacbb4d3 ZJS |
281 | return CURL_READFUNC_ABORT; |
282 | } else if (r == 0) { | |
283 | if (u->input_event) | |
284 | log_debug("No more entries, waiting for journal."); | |
285 | else { | |
286 | log_info("No more entries, closing journal."); | |
287 | close_journal_input(u); | |
288 | } | |
289 | ||
290 | u->uploading = false; | |
291 | ||
292 | break; | |
293 | } | |
294 | ||
295 | u->entry_state = ENTRY_CURSOR; | |
296 | } | |
297 | ||
298 | w = write_entry((char*)buf + filled, size * nmemb - filled, u); | |
299 | if (w < 0) | |
300 | return CURL_READFUNC_ABORT; | |
301 | filled += w; | |
302 | ||
303 | if (filled == 0) { | |
304 | log_error("Buffer space is too small to write entry."); | |
305 | return CURL_READFUNC_ABORT; | |
306 | } else if (u->entry_state != ENTRY_DONE) | |
307 | /* This means that all available space was used up */ | |
308 | break; | |
309 | ||
310 | log_debug("Entry %zu (%s) has been uploaded.", | |
722b6795 | 311 | u->entries_sent, u->current_cursor); |
eacbb4d3 ZJS |
312 | } |
313 | ||
314 | return filled; | |
315 | } | |
316 | ||
317 | void close_journal_input(Uploader *u) { | |
318 | assert(u); | |
319 | ||
320 | if (u->journal) { | |
321 | log_debug("Closing journal input."); | |
322 | ||
323 | sd_journal_close(u->journal); | |
324 | u->journal = NULL; | |
325 | } | |
326 | u->timeout = 0; | |
327 | } | |
328 | ||
329 | static int process_journal_input(Uploader *u, int skip) { | |
330 | int r; | |
331 | ||
8a3db16d KC |
332 | if (u->uploading) |
333 | return 0; | |
334 | ||
eacbb4d3 | 335 | r = sd_journal_next_skip(u->journal, skip); |
eb56eb9b MS |
336 | if (r < 0) |
337 | return log_error_errno(r, "Failed to skip to next entry: %m"); | |
338 | else if (r < skip) | |
eacbb4d3 ZJS |
339 | return 0; |
340 | ||
341 | /* have data */ | |
342 | u->entry_state = ENTRY_CURSOR; | |
343 | return start_upload(u, journal_input_callback, u); | |
344 | } | |
345 | ||
346 | int check_journal_input(Uploader *u) { | |
347 | if (u->input_event) { | |
348 | int r; | |
349 | ||
350 | r = sd_journal_process(u->journal); | |
351 | if (r < 0) { | |
da927ba9 | 352 | log_error_errno(r, "Failed to process journal: %m"); |
eacbb4d3 ZJS |
353 | close_journal_input(u); |
354 | return r; | |
355 | } | |
356 | ||
357 | if (r == SD_JOURNAL_NOP) | |
358 | return 0; | |
359 | } | |
360 | ||
361 | return process_journal_input(u, 1); | |
362 | } | |
363 | ||
364 | static int dispatch_journal_input(sd_event_source *event, | |
365 | int fd, | |
366 | uint32_t revents, | |
367 | void *userp) { | |
368 | Uploader *u = userp; | |
369 | ||
370 | assert(u); | |
371 | ||
8a3db16d | 372 | if (u->uploading) |
eacbb4d3 | 373 | return 0; |
eacbb4d3 ZJS |
374 | |
375 | log_debug("Detected journal input, checking for new data."); | |
376 | return check_journal_input(u); | |
377 | } | |
378 | ||
379 | int open_journal_for_upload(Uploader *u, | |
380 | sd_journal *j, | |
381 | const char *cursor, | |
382 | bool after_cursor, | |
383 | bool follow) { | |
384 | int fd, r, events; | |
385 | ||
386 | u->journal = j; | |
387 | ||
388 | sd_journal_set_data_threshold(j, 0); | |
389 | ||
390 | if (follow) { | |
391 | fd = sd_journal_get_fd(j); | |
eb56eb9b MS |
392 | if (fd < 0) |
393 | return log_error_errno(fd, "sd_journal_get_fd failed: %m"); | |
eacbb4d3 ZJS |
394 | |
395 | events = sd_journal_get_events(j); | |
396 | ||
397 | r = sd_journal_reliable_fd(j); | |
398 | assert(r >= 0); | |
399 | if (r > 0) | |
400 | u->timeout = -1; | |
401 | else | |
402 | u->timeout = JOURNAL_UPLOAD_POLL_TIMEOUT; | |
403 | ||
404 | r = sd_event_add_io(u->events, &u->input_event, | |
405 | fd, events, dispatch_journal_input, u); | |
eb56eb9b MS |
406 | if (r < 0) |
407 | return log_error_errno(r, "Failed to register input event: %m"); | |
eacbb4d3 ZJS |
408 | |
409 | log_debug("Listening for journal events on fd:%d, timeout %d", | |
410 | fd, u->timeout == (uint64_t) -1 ? -1 : (int) u->timeout); | |
411 | } else | |
412 | log_debug("Not listening for journal events."); | |
413 | ||
414 | if (cursor) { | |
415 | r = sd_journal_seek_cursor(j, cursor); | |
ece174c5 | 416 | if (r < 0) |
eb56eb9b MS |
417 | return log_error_errno(r, "Failed to seek to cursor %s: %m", |
418 | cursor); | |
eacbb4d3 ZJS |
419 | } |
420 | ||
421 | return process_journal_input(u, 1 + !!after_cursor); | |
422 | } |