2 * Mini syslogd implementation for busybox
4 * Copyright (C) 1999 by Lineo, inc.
5 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include <sys/socket.h>
30 #include <sys/types.h>
40 #define ksyslog klogctl
41 extern int ksyslog(int type, char *buf, int len);
44 /* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
46 #include <sys/syslog.h>
48 /* Path for the file where all log messages are written */
49 #define __LOG_FILE "/var/log/messages"
52 static char* logFilePath = __LOG_FILE;
53 /* interval between marks in seconds */
54 static int MarkInterval = 20*60;
55 /* localhost's name */
56 static char LocalHostName[32];
58 static const char syslogd_usage[] =
59 "syslogd [OPTION]...\n\n"
60 "Linux system and kernel (provides klogd) logging utility.\n"
61 "Note that this version of syslogd/klogd ignores /etc/syslog.conf.\n\n"
63 "\t-m\tChange the mark timestamp interval. default=20min. 0=off\n"
64 "\t-n\tDo not fork into the background (for when run by init)\n"
66 "\t-K\tDo not start up the klogd process (by default syslogd spawns klogd).\n"
68 "\t-O\tSpecify an alternate log file. default=/var/log/messages\n";
71 /* print a message to the log file */
72 static void message(char *fmt, ...)
77 if ((fd = device_open(logFilePath, O_WRONLY|O_CREAT|O_NOCTTY|O_APPEND|O_NONBLOCK)) >= 0) {
78 va_start(arguments, fmt);
79 vdprintf(fd, fmt, arguments);
83 /* Always send console messages to /dev/console so people will see them. */
84 if ((fd = device_open(_PATH_CONSOLE, O_WRONLY|O_NOCTTY|O_NONBLOCK)) >= 0) {
85 va_start(arguments, fmt);
86 vdprintf(fd, fmt, arguments);
90 fprintf(stderr, "Bummer, can't print: ");
91 va_start(arguments, fmt);
92 vfprintf(stderr, fmt, arguments);
99 static void logMessage( int pri, char* msg)
106 for (c_fac=facilitynames; c_fac->c_name && !(c_fac->c_val==LOG_FAC(pri)<<3); c_fac++);
107 for (c_pri=prioritynames; c_pri->c_name && !(c_pri->c_val==LOG_PRI(pri)); c_pri++);
108 if (*c_fac->c_name=='\0' || *c_pri->c_name=='\0')
109 snprintf (res, sizeof(res), "<%d>", pri);
111 snprintf (res, sizeof(res), "%s.%s", c_fac->c_name, c_pri->c_name);
113 if (strlen(msg) < 16 || msg[3] != ' ' || msg[6] != ' ' ||
114 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
117 timestamp = ctime(&now) + 4;
118 timestamp[15] = '\0';
121 timestamp[15] = '\0';
125 /* todo: supress duplicates */
127 /* now spew out the message to wherever it is supposed to go */
128 message( "%s %s %s %s\n", timestamp, LocalHostName, res, msg);
131 static void quit_signal(int sig)
133 logMessage(LOG_SYSLOG|LOG_INFO, "System log daemon exiting.");
138 static void restart_signal(int sig)
140 /* pretend to restart */
141 logMessage(LOG_SYSLOG|LOG_INFO, "syslogd restarting");
144 static void domark(int sig)
146 if (MarkInterval > 0) {
147 logMessage(LOG_SYSLOG|LOG_INFO, "-- MARK --");
152 static void doSyslogd(void)
154 struct sockaddr_un sunx;
161 /* Set up sig handlers */
162 signal(SIGINT, quit_signal);
163 signal(SIGTERM, quit_signal);
164 signal(SIGQUIT, quit_signal);
165 signal(SIGHUP, restart_signal);
166 signal(SIGALRM, domark);
169 /* Remove any preexisting socket/file */
172 memset(&sunx, 0, sizeof(sunx));
173 sunx.sun_family = AF_UNIX; /* Unix domain socket */
174 strncpy(sunx.sun_path, _PATH_LOG, sizeof(sunx.sun_path));
175 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0 ) {
176 perror("Couldn't obtain descriptor for socket " _PATH_LOG);
180 addrLength = sizeof(sunx.sun_family) + strlen(sunx.sun_path);
181 if ( (bind(fd, (struct sockaddr *) &sunx, addrLength)) ||
184 perror("Could not connect to socket " _PATH_LOG);
189 if (chmod(_PATH_LOG, 0666) < 0) {
190 perror("Could not set permission on " _PATH_LOG);
194 logMessage(LOG_SYSLOG|LOG_INFO, "syslogd started: "
195 "BusyBox v" BB_VER " (" BB_BT ")");
198 while ((conn = accept(fd, (struct sockaddr *) &sunx,
201 while ((readSize=read(conn, buf, sizeof(buf))) > 0)
205 int pri = (LOG_USER|LOG_NOTICE);
207 memset (line, 0, sizeof(line));
210 while ( p && (c = *p) && q < &line[sizeof(line) - 1]) {
212 /* Parse the magic priority number */
214 while (isdigit(*(++p))) {
215 pri = 10 * pri + (*p - '0');
217 if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
218 pri = (LOG_USER|LOG_NOTICE);
219 } else if (c == '\n') {
221 } else if (iscntrl(c)&&(c<0177)) {
232 logMessage( pri, line);
242 static void klogd_signal(int sig)
246 logMessage(LOG_SYSLOG|LOG_INFO, "Kernel log daemon exiting.");
250 static void doKlogd(void)
252 int priority=LOG_INFO;
253 char log_buffer[4096];
256 /* Set up sig handlers */
257 signal(SIGINT, klogd_signal);
258 signal(SIGKILL, klogd_signal);
259 signal(SIGTERM, klogd_signal);
260 signal(SIGHUP, klogd_signal);
261 logMessage(LOG_SYSLOG|LOG_INFO, "klogd started: "
262 "BusyBox v" BB_VER " (" BB_BT ")");
267 /* Use kernel syscalls */
268 memset(log_buffer, '\0', sizeof(log_buffer));
269 if ( ksyslog(2, log_buffer, sizeof(log_buffer)) < 0 ) {
271 if ( errno == EINTR )
273 snprintf(message, 79, "klogd: Error return from sys_sycall: " \
274 "%d - %s.\n", errno, strerror(errno));
275 logMessage(LOG_SYSLOG|LOG_ERR, message);
279 if ( *log_buffer == '<' )
281 switch ( *(log_buffer+1) )
284 priority = LOG_EMERG;
287 priority = LOG_ALERT;
296 priority = LOG_WARNING;
299 priority = LOG_NOTICE;
306 priority = LOG_DEBUG;
310 logMessage(LOG_KERN|priority, logp);
317 extern int syslogd_main(int argc, char **argv)
322 int startKlogd = TRUE;
324 int stopDoingThat = FALSE;
328 while (--argc > 0 && **(++argv1) == '-') {
329 stopDoingThat = FALSE;
330 while (stopDoingThat == FALSE && *(++(*argv1))) {
334 usage(syslogd_usage);
336 MarkInterval = atoi(*(++argv1))*60;
348 usage(syslogd_usage);
350 logFilePath = *(++argv1);
351 stopDoingThat = TRUE;
354 usage(syslogd_usage);
359 /* Store away localhost's name before the fork */
360 gethostname(LocalHostName, sizeof(LocalHostName));
361 if ( (p = strchr(LocalHostName, '.')) ) {
365 if (doFork == TRUE) {
369 else if ( pid == 0 ) {
370 strncpy(argv[0], "syslogd",strlen(argv[0]));
378 /* Start up the klogd process */
379 if (startKlogd == TRUE) {
381 if (klogd_pid == 0 ) {
382 strncpy(argv[0], "klogd", strlen(argv[0]));