1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2011 Lennart Poettering
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.
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.
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/>.
22 #include <sys/socket.h>
29 #define SD_JOURNAL_SUPPRESS_LOCATION
31 #include "sd-journal.h"
33 #include "socket-util.h"
35 #define SNDBUF_SIZE (8*1024*1024)
37 /* We open a single fd, and we'll share it with the current process,
38 * all its threads, and all its subprocesses. This means we need to
39 * initialize it atomically, and need to operate on it atomically
40 * never assuming we are the only user */
42 static int journal_fd(void) {
44 static int fd_plus_one = 0;
48 return fd_plus_one - 1;
50 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
54 fd_inc_sndbuf(fd, SNDBUF_SIZE);
56 if (!__sync_bool_compare_and_swap(&fd_plus_one, 0, fd+1)) {
57 close_nointr_nofail(fd);
64 _public_ int sd_journal_print(int priority, const char *format, ...) {
69 r = sd_journal_printv(priority, format, ap);
75 _public_ int sd_journal_printv(int priority, const char *format, va_list ap) {
76 char buffer[8 + LINE_MAX], p[11];
79 if (priority < 0 || priority > 7)
85 snprintf(p, sizeof(p), "PRIORITY=%i", priority & LOG_PRIMASK);
88 memcpy(buffer, "MESSAGE=", 8);
89 vsnprintf(buffer+8, sizeof(buffer) - 8, format, ap);
93 IOVEC_SET_STRING(iov[0], buffer);
94 IOVEC_SET_STRING(iov[1], p);
96 return sd_journal_sendv(iov, 2);
99 static int fill_iovec_sprintf(const char *format, va_list ap, int extra, struct iovec **_iov) {
101 struct iovec *iov = NULL;
108 n = MAX(extra * 2, extra + 4);
109 iov = malloc0(n * sizeof(struct iovec));
125 c = realloc(iov, n * sizeof(struct iovec));
134 if (vasprintf(&buffer, format, ap) < 0) {
139 IOVEC_SET_STRING(iov[i++], buffer);
141 format = va_arg(ap, char *);
150 for (j = 0; j < i; j++)
151 free(iov[j].iov_base);
159 _public_ int sd_journal_send(const char *format, ...) {
162 struct iovec *iov = NULL;
164 va_start(ap, format);
165 i = fill_iovec_sprintf(format, ap, 0, &iov);
168 if (_unlikely_(i < 0)) {
173 r = sd_journal_sendv(iov, i);
176 for (j = 0; j < i; j++)
177 free(iov[j].iov_base);
184 _public_ int sd_journal_sendv(const struct iovec *iov, int n) {
190 struct sockaddr_un sa;
194 struct cmsghdr cmsghdr;
195 uint8_t buf[CMSG_SPACE(sizeof(int))];
197 struct cmsghdr *cmsg;
198 /* We use /dev/shm instead of /tmp here, since we want this to
199 * be a tmpfs, and one that is available from early boot on
200 * and where unprivileged users can create files. */
201 char path[] = "/dev/shm/journal.XXXXXX";
203 if (_unlikely_(!iov))
206 if (_unlikely_(n <= 0))
211 w = alloca(sizeof(struct iovec) * n * 5);
212 l = alloca(sizeof(uint64_t) * n);
214 for (i = 0; i < n; i++) {
217 if (_unlikely_(!iov[i].iov_base || iov[i].iov_len <= 1)) {
222 c = memchr(iov[i].iov_base, '=', iov[i].iov_len);
223 if (_unlikely_(!c || c == iov[i].iov_base)) {
228 nl = memchr(iov[i].iov_base, '\n', iov[i].iov_len);
230 if (_unlikely_(nl < c)) {
235 /* Already includes a newline? Bummer, then
236 * let's write the variable name, then a
237 * newline, then the size (64bit LE), followed
238 * by the data and a final newline */
240 w[j].iov_base = iov[i].iov_base;
241 w[j].iov_len = c - (char*) iov[i].iov_base;
244 IOVEC_SET_STRING(w[j++], "\n");
246 l[i] = htole64(iov[i].iov_len - (c - (char*) iov[i].iov_base) - 1);
247 w[j].iov_base = &l[i];
248 w[j].iov_len = sizeof(uint64_t);
251 w[j].iov_base = c + 1;
252 w[j].iov_len = iov[i].iov_len - (c - (char*) iov[i].iov_base) - 1;
256 /* Nothing special? Then just add the line and
257 * append a newline */
260 IOVEC_SET_STRING(w[j++], "\n");
264 if (_unlikely_(fd < 0)) {
270 sa.sun_family = AF_UNIX;
271 strncpy(sa.sun_path, "/run/systemd/journal/socket", sizeof(sa.sun_path));
275 mh.msg_namelen = offsetof(struct sockaddr_un, sun_path) + strlen(sa.sun_path);
279 k = sendmsg(fd, &mh, MSG_NOSIGNAL);
285 if (errno != EMSGSIZE && errno != ENOBUFS) {
290 /* Message doesn't fit... Let's dump the data in a temporary
291 * file and just pass a file descriptor of it to the other
294 buffer_fd = mkostemp(path, O_CLOEXEC|O_RDWR);
300 if (unlink(path) < 0) {
301 close_nointr_nofail(buffer_fd);
306 n = writev(buffer_fd, w, j);
308 close_nointr_nofail(buffer_fd);
317 mh.msg_control = &control;
318 mh.msg_controllen = sizeof(control);
320 cmsg = CMSG_FIRSTHDR(&mh);
321 cmsg->cmsg_level = SOL_SOCKET;
322 cmsg->cmsg_type = SCM_RIGHTS;
323 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
324 memcpy(CMSG_DATA(cmsg), &buffer_fd, sizeof(int));
326 mh.msg_controllen = cmsg->cmsg_len;
328 k = sendmsg(fd, &mh, MSG_NOSIGNAL);
329 close_nointr_nofail(buffer_fd);
344 _public_ int sd_journal_stream_fd(const char *identifier, int priority, int level_prefix) {
345 union sockaddr_union sa;
351 if (priority < 0 || priority > 7)
354 fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
359 sa.un.sun_family = AF_UNIX;
360 strncpy(sa.un.sun_path, "/run/systemd/journal/stdout", sizeof(sa.un.sun_path));
362 r = connect(fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
364 close_nointr_nofail(fd);
368 if (shutdown(fd, SHUT_RD) < 0) {
369 close_nointr_nofail(fd);
373 fd_inc_sndbuf(fd, SNDBUF_SIZE);
378 l = strlen(identifier);
379 header = alloca(l + 1 + 2 + 2 + 2 + 2 + 2);
381 memcpy(header, identifier, l);
383 header[l++] = '0' + priority;
385 header[l++] = '0' + !!level_prefix;
394 r = loop_write(fd, header, l, false);
396 close_nointr_nofail(fd);
400 if ((size_t) r != l) {
401 close_nointr_nofail(fd);
408 _public_ int sd_journal_print_with_location(int priority, const char *file, const char *line, const char *func, const char *format, ...) {
412 va_start(ap, format);
413 r = sd_journal_printv_with_location(priority, file, line, func, format, ap);
419 _public_ int sd_journal_printv_with_location(int priority, const char *file, const char *line, const char *func, const char *format, va_list ap) {
420 char buffer[8 + LINE_MAX], p[11];
425 if (priority < 0 || priority > 7)
428 if (_unlikely_(!format))
431 snprintf(p, sizeof(p), "PRIORITY=%i", priority & LOG_PRIMASK);
434 memcpy(buffer, "MESSAGE=", 8);
435 vsnprintf(buffer+8, sizeof(buffer) - 8, format, ap);
436 char_array_0(buffer);
438 /* func is initialized from __func__ which is not a macro, but
439 * a static const char[], hence cannot easily be prefixed with
440 * CODE_FUNC=, hence let's do it manually here. */
443 memcpy(f, "CODE_FUNC=", 10);
444 memcpy(f + 10, func, fl + 1);
447 IOVEC_SET_STRING(iov[0], buffer);
448 IOVEC_SET_STRING(iov[1], p);
449 IOVEC_SET_STRING(iov[2], file);
450 IOVEC_SET_STRING(iov[3], line);
451 IOVEC_SET_STRING(iov[4], f);
453 return sd_journal_sendv(iov, ELEMENTSOF(iov));
456 _public_ int sd_journal_send_with_location(const char *file, const char *line, const char *func, const char *format, ...) {
459 struct iovec *iov = NULL;
463 va_start(ap, format);
464 i = fill_iovec_sprintf(format, ap, 3, &iov);
467 if (_unlikely_(i < 0)) {
474 memcpy(f, "CODE_FUNC=", 10);
475 memcpy(f + 10, func, fl + 1);
477 IOVEC_SET_STRING(iov[0], file);
478 IOVEC_SET_STRING(iov[1], line);
479 IOVEC_SET_STRING(iov[2], f);
481 r = sd_journal_sendv(iov, i);
484 for (j = 3; j < i; j++)
485 free(iov[j].iov_base);
492 _public_ int sd_journal_sendv_with_location(const char *file, const char *line, const char *func, const struct iovec *iov, int n) {
497 if (_unlikely_(!iov))
500 if (_unlikely_(n <= 0))
503 niov = alloca(sizeof(struct iovec) * (n + 3));
504 memcpy(niov, iov, sizeof(struct iovec) * n);
508 memcpy(f, "CODE_FUNC=", 10);
509 memcpy(f + 10, func, fl + 1);
511 IOVEC_SET_STRING(niov[n++], file);
512 IOVEC_SET_STRING(niov[n++], line);
513 IOVEC_SET_STRING(niov[n++], f);
515 return sd_journal_sendv(niov, n);