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