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
36 #include <sys/socket.h>
38 #include <sys/types.h>
40 #include <sys/param.h>
44 #define ksyslog klogctl
45 extern int ksyslog(int type, char *buf, int len);
48 /* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
50 #include <sys/syslog.h>
52 /* Path for the file where all log messages are written */
53 #define __LOG_FILE "/var/log/messages"
55 /* Path to the unix socket */
56 char lfile[PATH_MAX] = "";
58 static char *logFilePath = __LOG_FILE;
60 /* interval between marks in seconds */
61 static int MarkInterval = 20 * 60;
63 /* localhost's name */
64 static char LocalHostName[32];
66 static const char syslogd_usage[] =
67 "syslogd [OPTION]...\n\n"
68 "Linux system and kernel (provides klogd) logging utility.\n"
69 "Note that this version of syslogd/klogd ignores /etc/syslog.conf.\n\n"
71 "\t-m\tChange the mark timestamp interval. default=20min. 0=off\n"
72 "\t-n\tDo not fork into the background (for when run by init)\n"
74 "\t-K\tDo not start up the klogd process (by default syslogd spawns klogd).\n"
76 "\t-O\tSpecify an alternate log file. default=/var/log/messages\n";
78 /* Note: There is also a function called "message()" in init.c */
79 /* Print a message to the log file. */
80 static void message (char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
81 static void message (char *fmt, ...)
87 fl.l_whence = SEEK_SET;
91 if ((fd = device_open (logFilePath,
92 O_WRONLY | O_CREAT | O_NOCTTY | O_APPEND |
95 fcntl (fd, F_SETLKW, &fl);
96 va_start (arguments, fmt);
97 vdprintf (fd, fmt, arguments);
100 fcntl (fd, F_SETLKW, &fl);
103 /* Always send console messages to /dev/console so people will see them. */
104 if ((fd = device_open (_PATH_CONSOLE,
105 O_WRONLY | O_NOCTTY | O_NONBLOCK)) >= 0) {
106 va_start (arguments, fmt);
107 vdprintf (fd, fmt, arguments);
111 fprintf (stderr, "Bummer, can't print: ");
112 va_start (arguments, fmt);
113 vfprintf (stderr, fmt, arguments);
120 static void logMessage (int pri, char *msg)
124 static char res[20] = "";
128 for (c_fac = facilitynames;
129 c_fac->c_name && !(c_fac->c_val == LOG_FAC(pri) << 3); c_fac++);
130 for (c_pri = prioritynames;
131 c_pri->c_name && !(c_pri->c_val == LOG_PRI(pri)); c_pri++);
132 if (*c_fac->c_name == '\0' || *c_pri->c_name == '\0')
133 snprintf(res, sizeof(res), "<%d>", pri);
135 snprintf(res, sizeof(res), "%s.%s", c_fac->c_name, c_pri->c_name);
138 if (strlen(msg) < 16 || msg[3] != ' ' || msg[6] != ' ' ||
139 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') {
141 timestamp = ctime(&now) + 4;
142 timestamp[15] = '\0';
145 timestamp[15] = '\0';
149 /* todo: supress duplicates */
151 /* now spew out the message to wherever it is supposed to go */
152 message("%s %s %s %s\n", timestamp, LocalHostName, res, msg);
155 static void quit_signal(int sig)
157 logMessage(0, "System log daemon exiting.");
162 static void domark(int sig)
164 if (MarkInterval > 0) {
165 logMessage(LOG_SYSLOG | LOG_INFO, "-- MARK --");
170 static void doSyslogd (void) __attribute__ ((noreturn));
171 static void doSyslogd (void)
173 struct sockaddr_un sunx;
179 char lfile[PATH_MAX];
181 /* Set up signal handlers. */
182 signal (SIGINT, quit_signal);
183 signal (SIGTERM, quit_signal);
184 signal (SIGQUIT, quit_signal);
185 signal (SIGHUP, SIG_IGN);
186 signal (SIGCLD, SIG_IGN);
187 signal (SIGALRM, domark);
188 alarm (MarkInterval);
190 /* Create the syslog file so realpath() can work. */
191 close (open (_PATH_LOG, O_RDWR | O_CREAT, 0644));
192 if (realpath (_PATH_LOG, lfile) == NULL)
193 fatalError ("Could not resolv path to " _PATH_LOG ": %s", strerror (errno));
197 memset (&sunx, 0, sizeof (sunx));
198 sunx.sun_family = AF_UNIX;
199 strncpy (sunx.sun_path, lfile, sizeof (sunx.sun_path));
200 if ((sock_fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
201 fatalError ("Couldn't obtain descriptor for socket " _PATH_LOG ": %s", strerror (errno));
203 addrLength = sizeof (sunx.sun_family) + strlen (sunx.sun_path);
204 if ((bind (sock_fd, (struct sockaddr *) &sunx, addrLength)) || (listen (sock_fd, 5)))
205 fatalError ("Could not connect to socket " _PATH_LOG ": %s", strerror (errno));
207 if (chmod (lfile, 0666) < 0)
208 fatalError ("Could not set permission on " _PATH_LOG ": %s", strerror (errno));
211 FD_SET (sock_fd, &fds);
213 logMessage (0, "syslogd started: BusyBox v" BB_VER " (" BB_BT ")");
221 memcpy (&readfds, &fds, sizeof (fds));
223 if ((n_ready = select (FD_SETSIZE, &readfds, NULL, NULL, NULL)) < 0) {
224 if (errno == EINTR) continue; /* alarm may have happened. */
225 fatalError ("select error: %s\n", strerror (errno));
228 for (fd = 0; (n_ready > 0) && (fd < FD_SETSIZE); fd++) {
229 if (FD_ISSET (fd, &readfds)) {
238 if ((conn = accept (sock_fd, (struct sockaddr *) &sunx, &addrLength)) < 0) {
239 fatalError ("accept error: %s\n", strerror (errno));
245 perror ("syslogd: fork");
252 # define BUFSIZE 1023
253 char buf[ BUFSIZE + 1 ];
256 while ((n_read = read (conn, buf, BUFSIZE )) > 0) {
258 int pri = (LOG_USER | LOG_NOTICE);
259 char line[ BUFSIZE + 1 ];
262 char *p = buf, *q = line;
264 buf[ n_read - 1 ] = '\0';
266 while (p && (c = *p) && q < &line[ sizeof (line) - 1 ]) {
268 /* Parse the magic priority number. */
270 while (isdigit (*(++p))) {
271 pri = 10 * pri + (*p - '0');
273 if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
274 pri = (LOG_USER | LOG_NOTICE);
275 } else if (c == '\n') {
277 } else if (iscntrl (c) && (c < 0177)) {
287 logMessage (pri, line);
300 static void klogd_signal(int sig)
304 logMessage(0, "Kernel log daemon exiting.");
308 static void doKlogd (void) __attribute__ ((noreturn));
309 static void doKlogd (void)
311 int priority = LOG_INFO;
312 char log_buffer[4096];
315 /* Set up sig handlers */
316 signal(SIGINT, klogd_signal);
317 signal(SIGKILL, klogd_signal);
318 signal(SIGTERM, klogd_signal);
319 signal(SIGHUP, SIG_IGN);
320 logMessage(0, "klogd started: "
321 "BusyBox v" BB_VER " (" BB_BT ")");
326 /* Use kernel syscalls */
327 memset(log_buffer, '\0', sizeof(log_buffer));
328 if (ksyslog(2, log_buffer, sizeof(log_buffer)) < 0) {
333 snprintf(message, 79, "klogd: Error return from sys_sycall: " \
334 "%d - %s.\n", errno, strerror(errno));
335 logMessage(LOG_SYSLOG | LOG_ERR, message);
339 if (*log_buffer == '<') {
340 switch (*(log_buffer + 1)) {
342 priority = LOG_EMERG;
345 priority = LOG_ALERT;
354 priority = LOG_WARNING;
357 priority = LOG_NOTICE;
364 priority = LOG_DEBUG;
368 logMessage(LOG_KERN | priority, logp);
375 static void daemon_init (char **argv, char *dz, void fn (void))
379 strncpy(argv[0], dz, strlen(argv[0]));
384 extern int syslogd_main(int argc, char **argv)
390 int startKlogd = TRUE;
392 int stopDoingThat = FALSE;
396 while (--argc > 0 && **(++argv1) == '-') {
397 stopDoingThat = FALSE;
398 while (stopDoingThat == FALSE && *(++(*argv1))) {
402 usage(syslogd_usage);
404 MarkInterval = atoi(*(++argv1)) * 60;
416 usage(syslogd_usage);
418 logFilePath = *(++argv1);
419 stopDoingThat = TRUE;
422 usage(syslogd_usage);
427 /* Store away localhost's name before the fork */
428 gethostname(LocalHostName, sizeof(LocalHostName));
429 if ((p = strchr(LocalHostName, '.'))) {
436 /* Start up the klogd process */
437 if (startKlogd == TRUE) {
439 if (klogd_pid == 0) {
440 daemon_init (argv, "klogd", doKlogd);
445 if (doFork == TRUE) {
450 daemon_init (argv, "syslogd", doSyslogd);
461 c-file-style: "linux"