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87d2c1ff LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/epoll.h> | |
23 | #include <sys/socket.h> | |
24 | #include <errno.h> | |
25 | #include <sys/signalfd.h> | |
26 | #include <unistd.h> | |
27 | #include <fcntl.h> | |
f4b47811 LP |
28 | #include <sys/acl.h> |
29 | #include <acl/libacl.h> | |
7f3e6257 LP |
30 | #include <stddef.h> |
31 | #include <sys/ioctl.h> | |
32 | #include <linux/sockios.h> | |
87d2c1ff LP |
33 | |
34 | #include "hashmap.h" | |
cec736d2 | 35 | #include "journal-file.h" |
87d2c1ff LP |
36 | #include "sd-daemon.h" |
37 | #include "socket-util.h" | |
f4b47811 | 38 | #include "acl-util.h" |
69e5d42d | 39 | #include "cgroup-util.h" |
87d2c1ff | 40 | |
cab8ac60 LP |
41 | #define USER_JOURNALS_MAX 1024 |
42 | ||
87d2c1ff | 43 | typedef struct Server { |
87d2c1ff LP |
44 | int epoll_fd; |
45 | int signal_fd; | |
7f3e6257 LP |
46 | int syslog_fd; |
47 | int native_fd; | |
87d2c1ff | 48 | |
f4b47811 | 49 | JournalFile *runtime_journal; |
87d2c1ff LP |
50 | JournalFile *system_journal; |
51 | Hashmap *user_journals; | |
c2373f84 LP |
52 | |
53 | uint64_t seqnum; | |
7f3e6257 LP |
54 | |
55 | char *buffer; | |
56 | size_t buffer_size; | |
bc85bfee LP |
57 | |
58 | JournalMetrics metrics; | |
59 | uint64_t max_use; | |
87d2c1ff LP |
60 | } Server; |
61 | ||
f4b47811 LP |
62 | static void fix_perms(JournalFile *f, uid_t uid) { |
63 | acl_t acl; | |
64 | acl_entry_t entry; | |
65 | acl_permset_t permset; | |
66 | int r; | |
67 | ||
68 | assert(f); | |
69 | ||
70 | r = fchmod_and_fchown(f->fd, 0640, 0, 0); | |
71 | if (r < 0) | |
72 | log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r)); | |
73 | ||
74 | if (uid <= 0) | |
75 | return; | |
76 | ||
77 | acl = acl_get_fd(f->fd); | |
78 | if (!acl) { | |
79 | log_warning("Failed to read ACL on %s, ignoring: %m", f->path); | |
80 | return; | |
81 | } | |
82 | ||
83 | r = acl_find_uid(acl, uid, &entry); | |
84 | if (r <= 0) { | |
85 | ||
86 | if (acl_create_entry(&acl, &entry) < 0 || | |
87 | acl_set_tag_type(entry, ACL_USER) < 0 || | |
88 | acl_set_qualifier(entry, &uid) < 0) { | |
89 | log_warning("Failed to patch ACL on %s, ignoring: %m", f->path); | |
90 | goto finish; | |
91 | } | |
92 | } | |
93 | ||
94 | if (acl_get_permset(entry, &permset) < 0 || | |
95 | acl_add_perm(permset, ACL_READ) < 0 || | |
96 | acl_calc_mask(&acl) < 0) { | |
97 | log_warning("Failed to patch ACL on %s, ignoring: %m", f->path); | |
98 | goto finish; | |
99 | } | |
100 | ||
101 | if (acl_set_fd(f->fd, acl) < 0) | |
102 | log_warning("Failed to set ACL on %s, ignoring: %m", f->path); | |
103 | ||
104 | finish: | |
105 | acl_free(acl); | |
106 | } | |
107 | ||
108 | static JournalFile* find_journal(Server *s, uid_t uid) { | |
109 | char *p; | |
110 | int r; | |
111 | JournalFile *f; | |
3fbf9cbb LP |
112 | char ids[33]; |
113 | sd_id128_t machine; | |
f4b47811 LP |
114 | |
115 | assert(s); | |
116 | ||
117 | /* We split up user logs only on /var, not on /run */ | |
118 | if (!s->system_journal) | |
119 | return s->runtime_journal; | |
120 | ||
121 | if (uid <= 0) | |
122 | return s->system_journal; | |
123 | ||
3fbf9cbb LP |
124 | r = sd_id128_get_machine(&machine); |
125 | if (r < 0) | |
126 | return s->system_journal; | |
127 | ||
f4b47811 LP |
128 | f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid)); |
129 | if (f) | |
130 | return f; | |
131 | ||
3fbf9cbb | 132 | if (asprintf(&p, "/var/log/journal/%s/user-%lu.journal", sd_id128_to_string(machine, ids), (unsigned long) uid) < 0) |
f4b47811 LP |
133 | return s->system_journal; |
134 | ||
cab8ac60 LP |
135 | while (hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) { |
136 | /* Too many open? Then let's close one */ | |
137 | f = hashmap_steal_first(s->user_journals); | |
138 | assert(f); | |
139 | journal_file_close(f); | |
140 | } | |
141 | ||
c2373f84 | 142 | r = journal_file_open(p, O_RDWR|O_CREAT, 0640, s->system_journal, &f); |
f4b47811 LP |
143 | free(p); |
144 | ||
145 | if (r < 0) | |
146 | return s->system_journal; | |
147 | ||
148 | fix_perms(f, uid); | |
149 | ||
150 | r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f); | |
151 | if (r < 0) { | |
152 | journal_file_close(f); | |
153 | return s->system_journal; | |
154 | } | |
155 | ||
156 | return f; | |
157 | } | |
158 | ||
bc85bfee LP |
159 | static void server_vacuum(Server *s) { |
160 | Iterator i; | |
161 | void *k; | |
162 | char *p; | |
163 | char ids[33]; | |
164 | sd_id128_t machine; | |
165 | int r; | |
166 | JournalFile *f; | |
167 | ||
168 | log_info("Rotating..."); | |
169 | ||
170 | if (s->runtime_journal) { | |
171 | r = journal_file_rotate(&s->runtime_journal); | |
172 | if (r < 0) | |
173 | log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r)); | |
174 | } | |
175 | ||
176 | if (s->system_journal) { | |
177 | r = journal_file_rotate(&s->system_journal); | |
178 | if (r < 0) | |
179 | log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r)); | |
180 | } | |
181 | ||
182 | HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) { | |
183 | r = journal_file_rotate(&f); | |
184 | if (r < 0) | |
185 | log_error("Failed to rotate %s: %s", f->path, strerror(-r)); | |
186 | else | |
187 | hashmap_replace(s->user_journals, k, f); | |
188 | } | |
189 | ||
190 | log_info("Vacuuming..."); | |
191 | ||
192 | r = sd_id128_get_machine(&machine); | |
193 | if (r < 0) { | |
194 | log_error("Failed to get machine ID: %s", strerror(-r)); | |
195 | return; | |
196 | } | |
197 | ||
198 | if (asprintf(&p, "/var/log/journal/%s", sd_id128_to_string(machine, ids)) < 0) { | |
199 | log_error("Out of memory."); | |
200 | return; | |
201 | } | |
202 | ||
203 | r = journal_directory_vacuum(p, s->max_use, s->metrics.keep_free); | |
204 | if (r < 0 && r != -ENOENT) | |
205 | log_error("Failed to vacuum %s: %s", p, strerror(-r)); | |
206 | free(p); | |
207 | ||
208 | if (asprintf(&p, "/run/log/journal/%s", ids) < 0) { | |
209 | log_error("Out of memory."); | |
210 | return; | |
211 | } | |
212 | ||
213 | r = journal_directory_vacuum(p, s->max_use, s->metrics.keep_free); | |
214 | if (r < 0 && r != -ENOENT) | |
215 | log_error("Failed to vacuum %s: %s", p, strerror(-r)); | |
216 | free(p); | |
217 | } | |
218 | ||
7f3e6257 LP |
219 | static void dispatch_message(Server *s, struct iovec *iovec, unsigned n, unsigned m, struct ucred *ucred, struct timeval *tv) { |
220 | char *pid = NULL, *uid = NULL, *gid = NULL, | |
87d2c1ff LP |
221 | *source_time = NULL, *boot_id = NULL, *machine_id = NULL, |
222 | *comm = NULL, *cmdline = NULL, *hostname = NULL, | |
223 | *audit_session = NULL, *audit_loginuid = NULL, | |
69e5d42d | 224 | *exe = NULL, *cgroup = NULL; |
7f3e6257 | 225 | |
87d2c1ff LP |
226 | char idbuf[33]; |
227 | sd_id128_t id; | |
228 | int r; | |
229 | char *t; | |
de190aef | 230 | uid_t loginuid = 0, realuid = 0; |
f4b47811 | 231 | JournalFile *f; |
bc85bfee | 232 | bool vacuumed = false; |
87d2c1ff | 233 | |
7f3e6257 LP |
234 | assert(s); |
235 | assert(iovec || n == 0); | |
87d2c1ff | 236 | |
7f3e6257 LP |
237 | if (n == 0) |
238 | return; | |
87d2c1ff | 239 | |
7f3e6257 | 240 | assert(n + 13 <= m); |
87d2c1ff LP |
241 | |
242 | if (ucred) { | |
243 | uint32_t session; | |
69e5d42d | 244 | char *path; |
87d2c1ff | 245 | |
de190aef LP |
246 | realuid = ucred->uid; |
247 | ||
248 | if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0) | |
87d2c1ff LP |
249 | IOVEC_SET_STRING(iovec[n++], pid); |
250 | ||
de190aef | 251 | if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0) |
87d2c1ff LP |
252 | IOVEC_SET_STRING(iovec[n++], uid); |
253 | ||
de190aef | 254 | if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0) |
87d2c1ff LP |
255 | IOVEC_SET_STRING(iovec[n++], gid); |
256 | ||
257 | r = get_process_comm(ucred->pid, &t); | |
258 | if (r >= 0) { | |
de190aef | 259 | comm = strappend("_COMM=", t); |
87d2c1ff LP |
260 | if (comm) |
261 | IOVEC_SET_STRING(iovec[n++], comm); | |
262 | free(t); | |
263 | } | |
264 | ||
265 | r = get_process_exe(ucred->pid, &t); | |
266 | if (r >= 0) { | |
de190aef | 267 | exe = strappend("_EXE=", t); |
87d2c1ff LP |
268 | if (comm) |
269 | IOVEC_SET_STRING(iovec[n++], exe); | |
270 | free(t); | |
271 | } | |
272 | ||
273 | r = get_process_cmdline(ucred->pid, LINE_MAX, false, &t); | |
274 | if (r >= 0) { | |
de190aef | 275 | cmdline = strappend("_CMDLINE=", t); |
87d2c1ff LP |
276 | if (cmdline) |
277 | IOVEC_SET_STRING(iovec[n++], cmdline); | |
278 | free(t); | |
279 | } | |
280 | ||
281 | r = audit_session_from_pid(ucred->pid, &session); | |
282 | if (r >= 0) | |
de190aef | 283 | if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) session) >= 0) |
87d2c1ff LP |
284 | IOVEC_SET_STRING(iovec[n++], audit_session); |
285 | ||
286 | r = audit_loginuid_from_pid(ucred->pid, &loginuid); | |
287 | if (r >= 0) | |
de190aef | 288 | if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0) |
87d2c1ff | 289 | IOVEC_SET_STRING(iovec[n++], audit_loginuid); |
69e5d42d LP |
290 | |
291 | r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, ucred->pid, &path); | |
292 | if (r >= 0) { | |
de190aef | 293 | cgroup = strappend("_SYSTEMD_CGROUP=", path); |
69e5d42d LP |
294 | if (cgroup) |
295 | IOVEC_SET_STRING(iovec[n++], cgroup); | |
296 | free(path); | |
297 | } | |
87d2c1ff LP |
298 | } |
299 | ||
300 | if (tv) { | |
de190aef | 301 | if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu", |
87d2c1ff LP |
302 | (unsigned long long) timeval_load(tv)) >= 0) |
303 | IOVEC_SET_STRING(iovec[n++], source_time); | |
304 | } | |
305 | ||
ed49ef3f LP |
306 | /* Note that strictly speaking storing the boot id here is |
307 | * redundant since the entry includes this in-line | |
308 | * anyway. However, we need this indexed, too. */ | |
87d2c1ff LP |
309 | r = sd_id128_get_boot(&id); |
310 | if (r >= 0) | |
de190aef | 311 | if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0) |
87d2c1ff LP |
312 | IOVEC_SET_STRING(iovec[n++], boot_id); |
313 | ||
314 | r = sd_id128_get_machine(&id); | |
315 | if (r >= 0) | |
de190aef | 316 | if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0) |
87d2c1ff LP |
317 | IOVEC_SET_STRING(iovec[n++], machine_id); |
318 | ||
319 | t = gethostname_malloc(); | |
320 | if (t) { | |
de190aef | 321 | hostname = strappend("_HOSTNAME=", t); |
87d2c1ff LP |
322 | if (hostname) |
323 | IOVEC_SET_STRING(iovec[n++], hostname); | |
324 | free(t); | |
325 | } | |
326 | ||
7f3e6257 LP |
327 | assert(n <= m); |
328 | ||
bc85bfee | 329 | retry: |
de190aef | 330 | f = find_journal(s, realuid == 0 ? 0 : loginuid); |
f4b47811 LP |
331 | if (!f) |
332 | log_warning("Dropping message, as we can't find a place to store the data."); | |
333 | else { | |
c2373f84 | 334 | r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL); |
87d2c1ff | 335 | |
bc85bfee LP |
336 | if (r == -E2BIG && !vacuumed) { |
337 | log_info("Allocation limit reached."); | |
338 | ||
339 | server_vacuum(s); | |
340 | vacuumed = true; | |
341 | ||
342 | log_info("Retrying write."); | |
343 | goto retry; | |
344 | } | |
345 | ||
f4b47811 LP |
346 | if (r < 0) |
347 | log_error("Failed to write entry, ignoring: %s", strerror(-r)); | |
348 | } | |
87d2c1ff | 349 | |
87d2c1ff LP |
350 | free(pid); |
351 | free(uid); | |
352 | free(gid); | |
353 | free(comm); | |
69e5d42d | 354 | free(exe); |
87d2c1ff LP |
355 | free(cmdline); |
356 | free(source_time); | |
357 | free(boot_id); | |
358 | free(machine_id); | |
359 | free(hostname); | |
360 | free(audit_session); | |
361 | free(audit_loginuid); | |
7f3e6257 LP |
362 | free(cgroup); |
363 | ||
364 | } | |
365 | ||
366 | static void process_syslog_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv) { | |
367 | char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL; | |
368 | struct iovec iovec[16]; | |
369 | unsigned n = 0; | |
370 | int priority = LOG_USER | LOG_INFO; | |
371 | ||
372 | assert(s); | |
373 | assert(buf); | |
374 | ||
375 | parse_syslog_priority((char**) &buf, &priority); | |
376 | skip_syslog_date((char**) &buf); | |
377 | ||
378 | if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0) | |
379 | IOVEC_SET_STRING(iovec[n++], syslog_priority); | |
380 | ||
381 | if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0) | |
382 | IOVEC_SET_STRING(iovec[n++], syslog_facility); | |
383 | ||
384 | message = strappend("MESSAGE=", buf); | |
385 | if (message) | |
386 | IOVEC_SET_STRING(iovec[n++], message); | |
387 | ||
388 | dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv); | |
389 | ||
390 | free(message); | |
87d2c1ff LP |
391 | free(syslog_facility); |
392 | free(syslog_priority); | |
7f3e6257 LP |
393 | } |
394 | ||
395 | static void process_native_message(Server *s, const void *buffer, size_t buffer_size, struct ucred *ucred, struct timeval *tv) { | |
396 | struct iovec *iovec = NULL; | |
397 | unsigned n = 0, m = 0, j; | |
398 | const char *p; | |
399 | size_t remaining; | |
400 | ||
401 | assert(s); | |
402 | assert(buffer || n == 0); | |
403 | ||
404 | p = buffer; | |
405 | remaining = buffer_size; | |
406 | ||
407 | while (remaining > 0) { | |
408 | const char *e, *q; | |
409 | ||
410 | e = memchr(p, '\n', remaining); | |
411 | ||
412 | if (!e) { | |
413 | /* Trailing noise, let's ignore it, and flush what we collected */ | |
414 | log_debug("Received message with trailing noise, ignoring."); | |
415 | break; | |
416 | } | |
417 | ||
418 | if (e == p) { | |
419 | /* Entry separator */ | |
420 | dispatch_message(s, iovec, n, m, ucred, tv); | |
421 | n = 0; | |
422 | ||
423 | p++; | |
424 | remaining--; | |
425 | continue; | |
426 | } | |
427 | ||
428 | if (*p == '.') { | |
429 | /* Control command, ignore for now */ | |
430 | remaining -= (e - p) + 1; | |
431 | p = e + 1; | |
432 | continue; | |
433 | } | |
434 | ||
435 | /* A property follows */ | |
436 | ||
437 | if (n+13 >= m) { | |
438 | struct iovec *c; | |
439 | unsigned u; | |
440 | ||
441 | u = MAX((n+13U) * 2U, 4U); | |
442 | c = realloc(iovec, u * sizeof(struct iovec)); | |
443 | if (!c) { | |
444 | log_error("Out of memory"); | |
445 | break; | |
446 | } | |
447 | ||
448 | iovec = c; | |
449 | m = u; | |
450 | } | |
451 | ||
452 | q = memchr(p, '=', e - p); | |
453 | if (q) { | |
2b0ba69b LP |
454 | if (p[0] != '_') { |
455 | /* If the field name starts with an | |
456 | * underscore, skip the variable, | |
457 | * since that indidates a trusted | |
458 | * field */ | |
459 | iovec[n].iov_base = (char*) p; | |
460 | iovec[n].iov_len = e - p; | |
461 | n++; | |
462 | } | |
7f3e6257 LP |
463 | |
464 | remaining -= (e - p) + 1; | |
465 | p = e + 1; | |
466 | continue; | |
467 | } else { | |
468 | uint64_t l; | |
469 | char *k; | |
470 | ||
471 | if (remaining < e - p + 1 + sizeof(uint64_t) + 1) { | |
472 | log_debug("Failed to parse message, ignoring."); | |
473 | break; | |
474 | } | |
475 | ||
476 | memcpy(&l, e + 1, sizeof(uint64_t)); | |
477 | l = le64toh(l); | |
478 | ||
479 | if (remaining < e - p + 1 + sizeof(uint64_t) + l + 1 || | |
480 | e[1+sizeof(uint64_t)+l] != '\n') { | |
481 | log_debug("Failed to parse message, ignoring."); | |
482 | break; | |
483 | } | |
484 | ||
485 | k = malloc((e - p) + 1 + l); | |
486 | if (!k) { | |
487 | log_error("Out of memory"); | |
488 | break; | |
489 | } | |
490 | ||
491 | memcpy(k, p, e - p); | |
492 | k[e - p] = '='; | |
493 | memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l); | |
494 | ||
2b0ba69b LP |
495 | if (k[0] != '_') { |
496 | iovec[n].iov_base = k; | |
497 | iovec[n].iov_len = (e - p) + 1 + l; | |
498 | n++; | |
499 | } else | |
500 | free(k); | |
7f3e6257 LP |
501 | |
502 | remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1; | |
503 | p = e + 1 + sizeof(uint64_t) + l + 1; | |
504 | } | |
505 | } | |
506 | ||
507 | dispatch_message(s, iovec, n, m, ucred, tv); | |
508 | ||
509 | for (j = 0; j < n; j++) | |
510 | if (iovec[j].iov_base < buffer || | |
511 | (const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size) | |
512 | free(iovec[j].iov_base); | |
87d2c1ff LP |
513 | } |
514 | ||
515 | static int process_event(Server *s, struct epoll_event *ev) { | |
516 | assert(s); | |
517 | ||
518 | if (ev->events != EPOLLIN) { | |
519 | log_info("Got invalid event from epoll."); | |
520 | return -EIO; | |
521 | } | |
522 | ||
523 | if (ev->data.fd == s->signal_fd) { | |
524 | struct signalfd_siginfo sfsi; | |
525 | ssize_t n; | |
526 | ||
527 | n = read(s->signal_fd, &sfsi, sizeof(sfsi)); | |
528 | if (n != sizeof(sfsi)) { | |
529 | ||
530 | if (n >= 0) | |
531 | return -EIO; | |
532 | ||
533 | if (errno == EINTR || errno == EAGAIN) | |
534 | return 0; | |
535 | ||
536 | return -errno; | |
537 | } | |
538 | ||
539 | log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo)); | |
540 | return 0; | |
541 | ||
cec736d2 LP |
542 | } |
543 | ||
7f3e6257 LP |
544 | if (ev->data.fd == s->native_fd || |
545 | ev->data.fd == s->syslog_fd) { | |
87d2c1ff | 546 | for (;;) { |
87d2c1ff LP |
547 | struct msghdr msghdr; |
548 | struct iovec iovec; | |
549 | struct ucred *ucred = NULL; | |
550 | struct timeval *tv = NULL; | |
551 | struct cmsghdr *cmsg; | |
552 | union { | |
553 | struct cmsghdr cmsghdr; | |
554 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) + | |
555 | CMSG_SPACE(sizeof(struct timeval))]; | |
556 | } control; | |
557 | ssize_t n; | |
7f3e6257 LP |
558 | int v; |
559 | ||
560 | if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) { | |
561 | log_error("SIOCINQ failed: %m"); | |
562 | return -errno; | |
563 | } | |
564 | ||
565 | if (v <= 0) | |
566 | return 1; | |
567 | ||
568 | if (s->buffer_size < (size_t) v) { | |
569 | void *b; | |
570 | size_t l; | |
571 | ||
572 | l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2); | |
573 | b = realloc(s->buffer, l+1); | |
574 | ||
575 | if (!b) { | |
576 | log_error("Couldn't increase buffer."); | |
577 | return -ENOMEM; | |
578 | } | |
579 | ||
580 | s->buffer_size = l; | |
581 | s->buffer = b; | |
582 | } | |
87d2c1ff LP |
583 | |
584 | zero(iovec); | |
7f3e6257 LP |
585 | iovec.iov_base = s->buffer; |
586 | iovec.iov_len = s->buffer_size; | |
87d2c1ff LP |
587 | |
588 | zero(control); | |
589 | zero(msghdr); | |
590 | msghdr.msg_iov = &iovec; | |
591 | msghdr.msg_iovlen = 1; | |
592 | msghdr.msg_control = &control; | |
593 | msghdr.msg_controllen = sizeof(control); | |
594 | ||
595 | n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT); | |
596 | if (n < 0) { | |
597 | ||
598 | if (errno == EINTR || errno == EAGAIN) | |
599 | return 1; | |
600 | ||
601 | log_error("recvmsg() failed: %m"); | |
602 | return -errno; | |
603 | } | |
604 | ||
605 | for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) { | |
606 | ||
607 | if (cmsg->cmsg_level == SOL_SOCKET && | |
608 | cmsg->cmsg_type == SCM_CREDENTIALS && | |
609 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) | |
610 | ucred = (struct ucred*) CMSG_DATA(cmsg); | |
611 | else if (cmsg->cmsg_level == SOL_SOCKET && | |
612 | cmsg->cmsg_type == SO_TIMESTAMP && | |
613 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval))) | |
614 | tv = (struct timeval*) CMSG_DATA(cmsg); | |
615 | } | |
616 | ||
7f3e6257 LP |
617 | if (ev->data.fd == s->syslog_fd) { |
618 | char *e; | |
619 | ||
620 | e = memchr(s->buffer, '\n', n); | |
621 | if (e) | |
622 | *e = 0; | |
623 | else | |
624 | s->buffer[n] = 0; | |
87d2c1ff | 625 | |
7f3e6257 LP |
626 | process_syslog_message(s, strstrip(s->buffer), ucred, tv); |
627 | } else | |
628 | process_native_message(s, s->buffer, n, ucred, tv); | |
87d2c1ff | 629 | } |
cec736d2 LP |
630 | |
631 | return 1; | |
87d2c1ff LP |
632 | } |
633 | ||
cec736d2 LP |
634 | log_error("Unknown event."); |
635 | return 0; | |
87d2c1ff LP |
636 | } |
637 | ||
ed49ef3f LP |
638 | static int system_journal_open(Server *s) { |
639 | int r; | |
640 | char *fn; | |
641 | sd_id128_t machine; | |
642 | char ids[33]; | |
643 | ||
644 | r = sd_id128_get_machine(&machine); | |
645 | if (r < 0) | |
646 | return r; | |
647 | ||
648 | /* First try to create the machine path, but not the prefix */ | |
250d54b5 | 649 | fn = strappend("/var/log/journal/", sd_id128_to_string(machine, ids)); |
ed49ef3f LP |
650 | if (!fn) |
651 | return -ENOMEM; | |
652 | (void) mkdir(fn, 0755); | |
653 | free(fn); | |
654 | ||
655 | /* The create the system journal file */ | |
656 | fn = join("/var/log/journal/", ids, "/system.journal", NULL); | |
657 | if (!fn) | |
658 | return -ENOMEM; | |
659 | ||
0ac38b70 | 660 | r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->system_journal); |
ed49ef3f LP |
661 | free(fn); |
662 | ||
250d54b5 | 663 | if (r >= 0) { |
ed49ef3f | 664 | fix_perms(s->system_journal, 0); |
250d54b5 | 665 | return r; |
ed49ef3f LP |
666 | } |
667 | ||
668 | if (r < 0 && r != -ENOENT) { | |
250d54b5 | 669 | log_error("Failed to open system journal: %s", strerror(-r)); |
ed49ef3f LP |
670 | return r; |
671 | } | |
672 | ||
250d54b5 LP |
673 | /* /var didn't work, so try /run, but this time we |
674 | * create the prefix too */ | |
250d54b5 LP |
675 | fn = join("/run/log/journal/", ids, "/system.journal", NULL); |
676 | if (!fn) | |
677 | return -ENOMEM; | |
3fbf9cbb LP |
678 | |
679 | (void) mkdir_parents(fn, 0755); | |
0ac38b70 | 680 | r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->runtime_journal); |
250d54b5 LP |
681 | free(fn); |
682 | ||
683 | if (r < 0) { | |
684 | log_error("Failed to open runtime journal: %s", strerror(-r)); | |
685 | return r; | |
686 | } | |
687 | ||
688 | fix_perms(s->runtime_journal, 0); | |
689 | return r; | |
ed49ef3f LP |
690 | } |
691 | ||
7f3e6257 LP |
692 | static int open_syslog_socket(Server *s) { |
693 | union sockaddr_union sa; | |
694 | int one, r; | |
87d2c1ff LP |
695 | |
696 | assert(s); | |
697 | ||
7f3e6257 | 698 | if (s->syslog_fd < 0) { |
87d2c1ff | 699 | |
7f3e6257 LP |
700 | s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0); |
701 | if (s->syslog_fd < 0) { | |
702 | log_error("socket() failed: %m"); | |
703 | return -errno; | |
704 | } | |
705 | ||
706 | zero(sa); | |
707 | sa.un.sun_family = AF_UNIX; | |
708 | strncpy(sa.un.sun_path, "/run/systemd/syslog", sizeof(sa.un.sun_path)); | |
709 | ||
710 | unlink(sa.un.sun_path); | |
711 | ||
712 | r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path)); | |
713 | if (r < 0) { | |
714 | log_error("bind() failed: %m"); | |
715 | return -errno; | |
716 | } | |
717 | ||
718 | chmod(sa.un.sun_path, 0666); | |
87d2c1ff LP |
719 | } |
720 | ||
7f3e6257 LP |
721 | one = 1; |
722 | r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); | |
723 | if (r < 0) { | |
724 | log_error("SO_PASSCRED failed: %m"); | |
725 | return -errno; | |
87d2c1ff LP |
726 | } |
727 | ||
7f3e6257 LP |
728 | one = 1; |
729 | r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one)); | |
730 | if (r < 0) { | |
731 | log_error("SO_TIMESTAMP failed: %m"); | |
732 | return -errno; | |
87d2c1ff LP |
733 | } |
734 | ||
7f3e6257 LP |
735 | return 0; |
736 | } | |
87d2c1ff | 737 | |
7f3e6257 LP |
738 | static int open_native_socket(Server*s) { |
739 | union sockaddr_union sa; | |
740 | int one, r; | |
741 | ||
742 | assert(s); | |
743 | ||
744 | if (s->native_fd < 0) { | |
745 | ||
746 | s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0); | |
747 | if (s->native_fd < 0) { | |
87d2c1ff LP |
748 | log_error("socket() failed: %m"); |
749 | return -errno; | |
750 | } | |
751 | ||
752 | zero(sa); | |
753 | sa.un.sun_family = AF_UNIX; | |
7f3e6257 | 754 | strncpy(sa.un.sun_path, "/run/systemd/journal", sizeof(sa.un.sun_path)); |
87d2c1ff LP |
755 | |
756 | unlink(sa.un.sun_path); | |
757 | ||
7f3e6257 | 758 | r = bind(s->native_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path)); |
87d2c1ff LP |
759 | if (r < 0) { |
760 | log_error("bind() failed: %m"); | |
761 | return -errno; | |
762 | } | |
763 | ||
764 | chmod(sa.un.sun_path, 0666); | |
765 | } | |
766 | ||
767 | one = 1; | |
7f3e6257 | 768 | r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); |
87d2c1ff LP |
769 | if (r < 0) { |
770 | log_error("SO_PASSCRED failed: %m"); | |
771 | return -errno; | |
772 | } | |
773 | ||
774 | one = 1; | |
7f3e6257 | 775 | r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one)); |
87d2c1ff LP |
776 | if (r < 0) { |
777 | log_error("SO_TIMESTAMP failed: %m"); | |
778 | return -errno; | |
779 | } | |
780 | ||
7f3e6257 LP |
781 | return 0; |
782 | } | |
783 | ||
784 | static int server_init(Server *s) { | |
785 | int n, r, fd; | |
786 | struct epoll_event ev; | |
787 | sigset_t mask; | |
788 | ||
789 | assert(s); | |
790 | ||
791 | zero(*s); | |
792 | s->syslog_fd = s->native_fd = s->signal_fd = -1; | |
bc85bfee LP |
793 | s->metrics.max_size = DEFAULT_MAX_SIZE; |
794 | s->metrics.min_size = DEFAULT_MIN_SIZE; | |
795 | s->metrics.keep_free = DEFAULT_KEEP_FREE; | |
796 | s->max_use = DEFAULT_MAX_USE; | |
7f3e6257 LP |
797 | |
798 | s->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
799 | if (s->epoll_fd < 0) { | |
800 | log_error("Failed to create epoll object: %m"); | |
801 | return -errno; | |
802 | } | |
803 | ||
804 | n = sd_listen_fds(true); | |
805 | if (n < 0) { | |
806 | log_error("Failed to read listening file descriptors from environment: %s", strerror(-n)); | |
807 | return n; | |
808 | } | |
809 | ||
810 | for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) { | |
811 | ||
812 | if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) { | |
813 | ||
814 | if (s->syslog_fd >= 0) { | |
815 | log_error("Too many /dev/log sockets passed."); | |
816 | return -EINVAL; | |
817 | } | |
818 | ||
819 | s->syslog_fd = fd; | |
820 | ||
821 | } else if (sd_is_socket(fd, AF_UNIX, SOCK_DGRAM, -1) > 0) { | |
822 | ||
823 | if (s->native_fd >= 0) { | |
824 | log_error("Too many native sockets passed."); | |
825 | return -EINVAL; | |
826 | } | |
827 | ||
828 | s->native_fd = fd; | |
829 | } else { | |
830 | log_error("Unknown socket passed."); | |
831 | return -EINVAL; | |
832 | } | |
833 | } | |
834 | ||
835 | r = open_syslog_socket(s); | |
836 | if (r < 0) | |
837 | return r; | |
838 | ||
87d2c1ff LP |
839 | zero(ev); |
840 | ev.events = EPOLLIN; | |
841 | ev.data.fd = s->syslog_fd; | |
842 | if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) { | |
7f3e6257 LP |
843 | log_error("Failed to add syslog server fd to epoll object: %m"); |
844 | return -errno; | |
845 | } | |
846 | ||
847 | r = open_native_socket(s); | |
848 | if (r < 0) | |
849 | return r; | |
850 | ||
851 | zero(ev); | |
852 | ev.events = EPOLLIN; | |
853 | ev.data.fd = s->native_fd; | |
854 | if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->native_fd, &ev) < 0) { | |
855 | log_error("Failed to add native server fd to epoll object: %m"); | |
87d2c1ff LP |
856 | return -errno; |
857 | } | |
858 | ||
859 | s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func); | |
860 | if (!s->user_journals) { | |
861 | log_error("Out of memory."); | |
862 | return -ENOMEM; | |
863 | } | |
864 | ||
ed49ef3f LP |
865 | r = system_journal_open(s); |
866 | if (r < 0) | |
87d2c1ff | 867 | return r; |
87d2c1ff LP |
868 | |
869 | assert_se(sigemptyset(&mask) == 0); | |
870 | sigset_add_many(&mask, SIGINT, SIGTERM, -1); | |
871 | assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0); | |
872 | ||
873 | s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); | |
874 | if (s->signal_fd < 0) { | |
875 | log_error("signalfd(): %m"); | |
876 | return -errno; | |
877 | } | |
878 | ||
879 | zero(ev); | |
880 | ev.events = EPOLLIN; | |
881 | ev.data.fd = s->signal_fd; | |
882 | ||
883 | if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) { | |
884 | log_error("epoll_ctl(): %m"); | |
885 | return -errno; | |
886 | } | |
887 | ||
888 | return 0; | |
889 | } | |
890 | ||
891 | static void server_done(Server *s) { | |
892 | JournalFile *f; | |
893 | assert(s); | |
894 | ||
895 | if (s->system_journal) | |
896 | journal_file_close(s->system_journal); | |
897 | ||
f4b47811 LP |
898 | if (s->runtime_journal) |
899 | journal_file_close(s->runtime_journal); | |
900 | ||
87d2c1ff LP |
901 | while ((f = hashmap_steal_first(s->user_journals))) |
902 | journal_file_close(f); | |
903 | ||
904 | hashmap_free(s->user_journals); | |
905 | ||
906 | if (s->epoll_fd >= 0) | |
907 | close_nointr_nofail(s->epoll_fd); | |
908 | ||
909 | if (s->signal_fd >= 0) | |
910 | close_nointr_nofail(s->signal_fd); | |
911 | ||
912 | if (s->syslog_fd >= 0) | |
913 | close_nointr_nofail(s->syslog_fd); | |
7f3e6257 LP |
914 | |
915 | if (s->native_fd >= 0) | |
916 | close_nointr_nofail(s->native_fd); | |
87d2c1ff LP |
917 | } |
918 | ||
919 | int main(int argc, char *argv[]) { | |
920 | Server server; | |
921 | int r; | |
922 | ||
923 | /* if (getppid() != 1) { */ | |
924 | /* log_error("This program should be invoked by init only."); */ | |
925 | /* return EXIT_FAILURE; */ | |
926 | /* } */ | |
927 | ||
928 | if (argc > 1) { | |
929 | log_error("This program does not take arguments."); | |
930 | return EXIT_FAILURE; | |
931 | } | |
932 | ||
f4b47811 | 933 | log_set_target(LOG_TARGET_CONSOLE); |
87d2c1ff LP |
934 | log_parse_environment(); |
935 | log_open(); | |
936 | ||
937 | umask(0022); | |
938 | ||
939 | r = server_init(&server); | |
940 | if (r < 0) | |
941 | goto finish; | |
942 | ||
943 | log_debug("systemd-journald running as pid %lu", (unsigned long) getpid()); | |
944 | ||
945 | sd_notify(false, | |
946 | "READY=1\n" | |
947 | "STATUS=Processing messages..."); | |
50f20cfd | 948 | |
87d2c1ff LP |
949 | for (;;) { |
950 | struct epoll_event event; | |
951 | ||
952 | r = epoll_wait(server.epoll_fd, &event, 1, -1); | |
953 | if (r < 0) { | |
954 | ||
955 | if (errno == EINTR) | |
956 | continue; | |
957 | ||
958 | log_error("epoll_wait() failed: %m"); | |
959 | r = -errno; | |
960 | goto finish; | |
961 | } else if (r == 0) | |
962 | break; | |
963 | ||
964 | r = process_event(&server, &event); | |
965 | if (r < 0) | |
966 | goto finish; | |
967 | else if (r == 0) | |
968 | break; | |
969 | } | |
970 | ||
971 | finish: | |
972 | sd_notify(false, | |
973 | "STATUS=Shutting down..."); | |
974 | ||
975 | server_done(&server); | |
976 | ||
977 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
978 | } |