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