1 /* vi: set sw=4 ts=4: */
3 * Mini syslogd implementation for busybox
5 * Copyright (C) 1999,2000 by Lineo, inc.
6 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
8 * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
38 #include <sys/socket.h>
40 #include <sys/types.h>
42 #include <sys/param.h>
43 #include <linux/unistd.h>
46 typedef unsigned int socklen_t;
49 #if __GNU_LIBRARY__ < 5
52 # define __NR_klogctl __NR_syslog
53 static inline _syscall3(int, klogctl, int, type, char *, b, int, len);
55 #define klogctl syslog
59 # include <sys/klog.h>
64 /* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
66 #include <sys/syslog.h>
68 /* Path for the file where all log messages are written */
69 #define __LOG_FILE "/var/log/messages"
71 /* Path to the unix socket */
72 char lfile[BUFSIZ] = "";
74 static char *logFilePath = __LOG_FILE;
76 /* interval between marks in seconds */
77 static int MarkInterval = 20 * 60;
79 /* localhost's name */
80 static char LocalHostName[32];
82 static const char syslogd_usage[] =
83 "syslogd [OPTION]...\n"
84 #ifndef BB_FEATURE_TRIVIAL_HELP
85 "\nLinux system and kernel (provides klogd) logging utility.\n"
86 "Note that this version of syslogd/klogd ignores /etc/syslog.conf.\n\n"
88 "\t-m NUM\t\tInterval between MARK lines (default=20min, 0=off)\n"
89 "\t-n\t\tRun as a foreground process\n"
91 "\t-K\t\tDo not start up the klogd process\n"
93 "\t-O FILE\t\tUse an alternate log file (default=/var/log/messages)\n"
97 /* Note: There is also a function called "message()" in init.c */
98 /* Print a message to the log file. */
99 static void message (char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
100 static void message (char *fmt, ...)
106 fl.l_whence = SEEK_SET;
110 if ((fd = device_open (logFilePath,
111 O_WRONLY | O_CREAT | O_NOCTTY | O_APPEND |
114 fcntl (fd, F_SETLKW, &fl);
115 va_start (arguments, fmt);
116 vdprintf (fd, fmt, arguments);
119 fcntl (fd, F_SETLKW, &fl);
122 /* Always send console messages to /dev/console so people will see them. */
123 if ((fd = device_open (_PATH_CONSOLE,
124 O_WRONLY | O_NOCTTY | O_NONBLOCK)) >= 0) {
125 va_start (arguments, fmt);
126 vdprintf (fd, fmt, arguments);
130 fprintf (stderr, "Bummer, can't print: ");
131 va_start (arguments, fmt);
132 vfprintf (stderr, fmt, arguments);
139 static void logMessage (int pri, char *msg)
143 static char res[20] = "";
147 for (c_fac = facilitynames;
148 c_fac->c_name && !(c_fac->c_val == LOG_FAC(pri) << 3); c_fac++);
149 for (c_pri = prioritynames;
150 c_pri->c_name && !(c_pri->c_val == LOG_PRI(pri)); c_pri++);
151 if (*c_fac->c_name == '\0' || *c_pri->c_name == '\0')
152 snprintf(res, sizeof(res), "<%d>", pri);
154 snprintf(res, sizeof(res), "%s.%s", c_fac->c_name, c_pri->c_name);
157 if (strlen(msg) < 16 || msg[3] != ' ' || msg[6] != ' ' ||
158 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') {
160 timestamp = ctime(&now) + 4;
161 timestamp[15] = '\0';
164 timestamp[15] = '\0';
168 /* todo: supress duplicates */
170 /* now spew out the message to wherever it is supposed to go */
171 message("%s %s %s %s\n", timestamp, LocalHostName, res, msg);
174 static void quit_signal(int sig)
176 logMessage(0, "System log daemon exiting.");
181 static void domark(int sig)
183 if (MarkInterval > 0) {
184 logMessage(LOG_SYSLOG | LOG_INFO, "-- MARK --");
190 static int serveConnection (int conn)
192 char buf[ BUFSIZE + 1 ];
195 while ((n_read = read (conn, buf, BUFSIZE )) > 0) {
197 int pri = (LOG_USER | LOG_NOTICE);
198 char line[ BUFSIZE + 1 ];
201 char *p = buf, *q = line;
203 buf[ n_read - 1 ] = '\0';
205 while (p && (c = *p) && q < &line[ sizeof (line) - 1 ]) {
207 /* Parse the magic priority number. */
209 while (isdigit (*(++p))) {
210 pri = 10 * pri + (*p - '0');
212 if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
213 pri = (LOG_USER | LOG_NOTICE);
214 } else if (c == '\n') {
216 } else if (iscntrl (c) && (c < 0177)) {
226 logMessage (pri, line);
231 static void doSyslogd (void) __attribute__ ((noreturn));
232 static void doSyslogd (void)
234 struct sockaddr_un sunx;
235 socklen_t addrLength;
243 /* Set up signal handlers. */
244 signal (SIGINT, quit_signal);
245 signal (SIGTERM, quit_signal);
246 signal (SIGQUIT, quit_signal);
247 signal (SIGHUP, SIG_IGN);
248 signal (SIGCLD, SIG_IGN);
249 signal (SIGALRM, domark);
250 alarm (MarkInterval);
252 /* Create the syslog file so realpath() can work. */
253 close (open (_PATH_LOG, O_RDWR | O_CREAT, 0644));
254 if (realpath (_PATH_LOG, lfile) == NULL)
255 fatalError ("Could not resolv path to " _PATH_LOG ": %s\n", strerror (errno));
259 memset (&sunx, 0, sizeof (sunx));
260 sunx.sun_family = AF_UNIX;
261 strncpy (sunx.sun_path, lfile, sizeof (sunx.sun_path));
262 if ((sock_fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
263 fatalError ("Couldn't obtain descriptor for socket " _PATH_LOG ": %s\n", strerror (errno));
265 addrLength = sizeof (sunx.sun_family) + strlen (sunx.sun_path);
266 if ((bind (sock_fd, (struct sockaddr *) &sunx, addrLength)) || (listen (sock_fd, 5)))
267 fatalError ("Could not connect to socket " _PATH_LOG ": %s\n", strerror (errno));
269 if (chmod (lfile, 0666) < 0)
270 fatalError ("Could not set permission on " _PATH_LOG ": %s\n", strerror (errno));
273 FD_SET (sock_fd, &fds);
275 logMessage (0, "syslogd started: BusyBox v" BB_VER " (" BB_BT ")");
283 memcpy (&readfds, &fds, sizeof (fds));
285 if ((n_ready = select (FD_SETSIZE, &readfds, NULL, NULL, NULL)) < 0) {
286 if (errno == EINTR) continue; /* alarm may have happened. */
287 fatalError ("select error: %s\n", strerror (errno));
290 for (fd = 0; (n_ready > 0) && (fd < FD_SETSIZE); fd++) {
291 if (FD_ISSET (fd, &readfds)) {
300 if ((conn = accept (sock_fd, (struct sockaddr *) &sunx, &addrLength)) < 0) {
301 fatalError ("accept error: %s\n", strerror (errno));
307 perror ("syslogd: fork");
313 serveConnection (conn);
323 static void klogd_signal(int sig)
327 logMessage(0, "Kernel log daemon exiting.");
331 static void doKlogd (void) __attribute__ ((noreturn));
332 static void doKlogd (void)
334 int priority = LOG_INFO;
335 char log_buffer[4096];
338 /* Set up sig handlers */
339 signal(SIGINT, klogd_signal);
340 signal(SIGKILL, klogd_signal);
341 signal(SIGTERM, klogd_signal);
342 signal(SIGHUP, SIG_IGN);
343 logMessage(0, "klogd started: "
344 "BusyBox v" BB_VER " (" BB_BT ")");
349 /* Use kernel syscalls */
350 memset(log_buffer, '\0', sizeof(log_buffer));
351 if (klogctl(2, log_buffer, sizeof(log_buffer)) < 0) {
356 snprintf(message, 79, "klogd: Error return from sys_sycall: " \
357 "%d - %s.\n", errno, strerror(errno));
358 logMessage(LOG_SYSLOG | LOG_ERR, message);
362 if (*log_buffer == '<') {
363 switch (*(log_buffer + 1)) {
365 priority = LOG_EMERG;
368 priority = LOG_ALERT;
377 priority = LOG_WARNING;
380 priority = LOG_NOTICE;
387 priority = LOG_DEBUG;
391 logMessage(LOG_KERN | priority, logp);
398 static void daemon_init (char **argv, char *dz, void fn (void))
402 strncpy(argv[0], dz, strlen(argv[0]));
407 extern int syslogd_main(int argc, char **argv)
413 int startKlogd = TRUE;
415 int stopDoingThat = FALSE;
419 while (--argc > 0 && **(++argv1) == '-') {
420 stopDoingThat = FALSE;
421 while (stopDoingThat == FALSE && *(++(*argv1))) {
425 usage(syslogd_usage);
427 MarkInterval = atoi(*(++argv1)) * 60;
439 usage(syslogd_usage);
441 logFilePath = *(++argv1);
442 stopDoingThat = TRUE;
445 usage(syslogd_usage);
451 usage(syslogd_usage);
453 /* Store away localhost's name before the fork */
454 gethostname(LocalHostName, sizeof(LocalHostName));
455 if ((p = strchr(LocalHostName, '.'))) {
462 /* Start up the klogd process */
463 if (startKlogd == TRUE) {
465 if (klogd_pid == 0) {
466 daemon_init (argv, "klogd", doKlogd);
471 if (doFork == TRUE) {
476 daemon_init (argv, "syslogd", doSyslogd);
487 c-file-style: "linux"