1 /* vi: set sw=4 ts=4: */
3 * Mini syslogd implementation for busybox
5 * Copyright (C) 1999 by Lineo, inc.
6 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it 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 * This program is distributed in the hope that it will be useful,
14 * but 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 this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
34 #include <sys/socket.h>
36 #include <sys/types.h>
41 #define ksyslog klogctl
42 extern int ksyslog(int type, char *buf, int len);
45 /* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
47 #include <sys/syslog.h>
49 /* Path for the file where all log messages are written */
50 #define __LOG_FILE "/var/log/messages"
52 /* Path to the unix socket */
53 char lfile[PATH_MAX] = "";
55 static char *logFilePath = __LOG_FILE;
57 /* interval between marks in seconds */
58 static int MarkInterval = 20 * 60;
60 /* localhost's name */
61 static char LocalHostName[32];
63 static const char syslogd_usage[] =
64 "syslogd [OPTION]...\n\n"
65 "Linux system and kernel (provides klogd) logging utility.\n"
66 "Note that this version of syslogd/klogd ignores /etc/syslog.conf.\n\n"
68 "\t-m\tChange the mark timestamp interval. default=20min. 0=off\n"
69 "\t-n\tDo not fork into the background (for when run by init)\n"
71 "\t-K\tDo not start up the klogd process (by default syslogd spawns klogd).\n"
73 "\t-O\tSpecify an alternate log file. default=/var/log/messages\n";
75 /* Note: There is also a function called "message()" in init.c */
76 /* Print a message to the log file. */
77 static void message(char *fmt, ...)
78 __attribute__ ((format (printf, 1, 2)));
79 static void message(char *fmt, ...)
86 device_open(logFilePath,
87 O_WRONLY | O_CREAT | O_NOCTTY | O_APPEND |
89 va_start(arguments, fmt);
90 vdprintf(fd, fmt, arguments);
94 /* Always send console messages to /dev/console so people will see them. */
97 device_open(_PATH_CONSOLE,
98 O_WRONLY | O_NOCTTY | O_NONBLOCK)) >= 0) {
99 va_start(arguments, fmt);
100 vdprintf(fd, fmt, arguments);
104 fprintf(stderr, "Bummer, can't print: ");
105 va_start(arguments, fmt);
106 vfprintf(stderr, fmt, arguments);
113 static void logMessage(int pri, char *msg)
117 static char res[20] = "";
121 for (c_fac = facilitynames;
122 c_fac->c_name && !(c_fac->c_val == LOG_FAC(pri) << 3); c_fac++);
123 for (c_pri = prioritynames;
124 c_pri->c_name && !(c_pri->c_val == LOG_PRI(pri)); c_pri++);
125 if (*c_fac->c_name == '\0' || *c_pri->c_name == '\0')
126 snprintf(res, sizeof(res), "<%d>", pri);
128 snprintf(res, sizeof(res), "%s.%s", c_fac->c_name, c_pri->c_name);
131 if (strlen(msg) < 16 || msg[3] != ' ' || msg[6] != ' ' ||
132 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') {
134 timestamp = ctime(&now) + 4;
135 timestamp[15] = '\0';
138 timestamp[15] = '\0';
142 /* todo: supress duplicates */
144 /* now spew out the message to wherever it is supposed to go */
145 message("%s %s %s %s\n", timestamp, LocalHostName, res, msg);
148 static void quit_signal(int sig)
150 logMessage(0, "System log daemon exiting.");
155 static void domark(int sig)
157 if (MarkInterval > 0) {
158 logMessage(LOG_SYSLOG | LOG_INFO, "-- MARK --");
163 static void doSyslogd (void) __attribute__ ((noreturn));
164 static void doSyslogd (void)
166 struct sockaddr_un sunx;
170 char lfile[PATH_MAX];
171 int t = readlink(_PATH_LOG, lfile, sizeof(lfile) - 1); /* Resolve symlinks */
173 /* Set up sig handlers */
174 signal (SIGINT, quit_signal);
175 signal (SIGTERM, quit_signal);
176 signal (SIGQUIT, quit_signal);
177 signal (SIGHUP, SIG_IGN);
178 signal (SIGALRM, domark);
179 alarm (MarkInterval);
182 strncpy(lfile, _PATH_LOG, sizeof(lfile));
188 memset (&sunx, 0, sizeof(sunx));
190 sunx.sun_family = AF_UNIX;
191 strncpy (sunx.sun_path, lfile, sizeof(sunx.sun_path));
192 if ((sock_fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
193 perror ("Couldn't obtain descriptor for socket " _PATH_LOG);
197 addrLength = sizeof (sunx.sun_family) + strlen (sunx.sun_path);
198 if ((bind (sock_fd, (struct sockaddr *) &sunx, addrLength)) ||
199 (listen (sock_fd, 5))) {
200 perror ("Could not connect to socket " _PATH_LOG);
204 if (chmod (lfile, 0666) < 0) {
205 perror ("Could not set permission on " _PATH_LOG);
210 FD_SET (sock_fd, &readfds);
212 logMessage (0, "syslogd started: BusyBox v" BB_VER " (" BB_BT ")");
218 if ((n_ready = select (FD_SETSIZE, &readfds, NULL, NULL, NULL)) < 0) {
219 if (errno == EINTR) continue; /* alarm may have happened. */
224 /* Skip stdin, stdout, stderr */
225 for (fd = 3; fd <= FD_SETSIZE; fd++) {
226 if (FD_ISSET (fd, &readfds)) {
229 if ((conn = accept(sock_fd, (struct sockaddr *) &sunx,
232 exit (FALSE); /* #### ??? */
234 FD_SET (conn, &readfds);
237 #define BUFSIZE 1024 + 1
242 n_read = read (fd, buf, BUFSIZE);
245 perror ("read error");
248 else if (n_read > 0) {
251 int pri = (LOG_USER | LOG_NOTICE);
253 memset (line, 0, sizeof(line));
256 while (p && (c = *p) && q < &line[sizeof(line) - 1]) {
258 /* Parse the magic priority number */
260 while (isdigit(*(++p))) {
261 pri = 10 * pri + (*p - '0');
263 if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
264 pri = (LOG_USER | LOG_NOTICE);
265 } else if (c == '\n') {
267 } else if (iscntrl(c) && (c < 0177)) {
278 logMessage(pri, line);
282 FD_CLR (fd, &readfds);
295 static void klogd_signal(int sig)
299 logMessage(0, "Kernel log daemon exiting.");
303 static void doKlogd (void) __attribute__ ((noreturn));
304 static void doKlogd (void)
306 int priority = LOG_INFO;
307 char log_buffer[4096];
310 /* Set up sig handlers */
311 signal(SIGINT, klogd_signal);
312 signal(SIGKILL, klogd_signal);
313 signal(SIGTERM, klogd_signal);
314 signal(SIGHUP, SIG_IGN);
315 logMessage(0, "klogd started: "
316 "BusyBox v" BB_VER " (" BB_BT ")");
321 /* Use kernel syscalls */
322 memset(log_buffer, '\0', sizeof(log_buffer));
323 if (ksyslog(2, log_buffer, sizeof(log_buffer)) < 0) {
328 snprintf(message, 79, "klogd: Error return from sys_sycall: " \
329 "%d - %s.\n", errno, strerror(errno));
330 logMessage(LOG_SYSLOG | LOG_ERR, message);
334 if (*log_buffer == '<') {
335 switch (*(log_buffer + 1)) {
337 priority = LOG_EMERG;
340 priority = LOG_ALERT;
349 priority = LOG_WARNING;
352 priority = LOG_NOTICE;
359 priority = LOG_DEBUG;
363 logMessage(LOG_KERN | priority, logp);
370 static void daemon_init (char **argv, char *dz, void fn (void)) __attribute__ ((noreturn));
371 static void daemon_init (char **argv, char *dz, void fn (void))
375 strncpy(argv[0], dz, strlen(argv[0]));
380 extern int syslogd_main(int argc, char **argv)
386 int startKlogd = TRUE;
388 int stopDoingThat = FALSE;
392 while (--argc > 0 && **(++argv1) == '-') {
393 stopDoingThat = FALSE;
394 while (stopDoingThat == FALSE && *(++(*argv1))) {
398 usage(syslogd_usage);
400 MarkInterval = atoi(*(++argv1)) * 60;
412 usage(syslogd_usage);
414 logFilePath = *(++argv1);
415 stopDoingThat = TRUE;
418 usage(syslogd_usage);
423 /* Store away localhost's name before the fork */
424 gethostname(LocalHostName, sizeof(LocalHostName));
425 if ((p = strchr(LocalHostName, '.'))) {
432 /* Start up the klogd process */
433 if (startKlogd == TRUE) {
435 if (klogd_pid == 0) {
436 daemon_init (argv, "klogd", doKlogd);
441 if (doFork == TRUE) {
446 daemon_init (argv, "syslogd", doSyslogd);
457 * c-file-style: "linux"