blob: 29ede13db84fe1a1924b2cce72f6e3be5dcc1186 [file] [log] [blame]
Eric Andersen3843e961999-11-25 07:30:46 +00001/*
2 * Mini syslogd implementation for busybox
3 *
4 * Copyright (C) 1999 by Lineo, inc.
5 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
6 *
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.
11 *
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.
16 *
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
20 *
21 */
Eric Andersenb99df0f1999-11-24 09:04:33 +000022
Eric Andersen3843e961999-11-25 07:30:46 +000023#include "internal.h"
Eric Andersenb99df0f1999-11-24 09:04:33 +000024#include <stdio.h>
Eric Andersen14ec6cf1999-12-05 22:17:02 +000025#include <stdarg.h>
Eric Andersenb99df0f1999-11-24 09:04:33 +000026#include <sys/socket.h>
27#include <sys/un.h>
28#include <unistd.h>
Eric Andersen3843e961999-11-25 07:30:46 +000029#include <time.h>
30#include <sys/types.h>
31#include <sys/stat.h>
32#include <fcntl.h>
33#include <signal.h>
34#include <ctype.h>
35#include <netdb.h>
Eric Andersenb186d981999-12-03 09:19:54 +000036#include <sys/klog.h>
37#include <errno.h>
38#include <paths.h>
39
40#define ksyslog klogctl
41extern int ksyslog(int type, char *buf, int len);
Eric Andersenb99df0f1999-11-24 09:04:33 +000042
43
Eric Andersen3843e961999-11-25 07:30:46 +000044/* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
45#define SYSLOG_NAMES
46#include <sys/syslog.h>
47
48/* Path for the file where all log messages are written */
49#define __LOG_FILE "/var/log/messages"
Eric Andersen3843e961999-11-25 07:30:46 +000050
51
52static char* logFilePath = __LOG_FILE;
53/* interval between marks in seconds */
54static int MarkInterval = 20*60;
55/* localhost's name */
56static char LocalHostName[32];
57
58static const char syslogd_usage[] =
59 "syslogd [OPTION]...\n\n"
Eric Andersen0ecb54a1999-12-05 23:24:55 +000060 "Linux system and kernel (provides klogd) logging utility.\n"
61 "Note that this version of syslogd/klogd ignores /etc/syslog.conf.\n\n"
Eric Andersen3843e961999-11-25 07:30:46 +000062 "Options:\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"
Eric Andersen2cb55071999-12-10 08:25:07 +000065#ifdef BB_KLOGD
66 "\t-K\tDo not start up the klogd process (by default syslogd spawns klogd).\n"
67#endif
Eric Andersen3843e961999-11-25 07:30:46 +000068 "\t-O\tSpecify an alternate log file. default=/var/log/messages\n";
69
Eric Andersen3843e961999-11-25 07:30:46 +000070
71/* try to open up the specified device */
72static int device_open(char *device, int mode)
73{
74 int m, f, fd = -1;
75
76 m = mode | O_NONBLOCK;
77
78 /* Retry up to 5 times */
79 for (f = 0; f < 5; f++)
Erik Andersenfac10d72000-02-07 05:29:42 +000080 if ((fd = open(device, m, 0600)) >= 0)
Eric Andersen3843e961999-11-25 07:30:46 +000081 break;
82 if (fd < 0)
83 return fd;
84 /* Reset original flags. */
85 if (m != mode)
86 fcntl(fd, F_SETFL, mode);
87 return fd;
Eric Andersenb99df0f1999-11-24 09:04:33 +000088}
89
Eric Andersen3843e961999-11-25 07:30:46 +000090/* print a message to the log file */
91static void message(char *fmt, ...)
92{
93 int fd;
94 va_list arguments;
95
96 if ((fd = device_open(logFilePath, O_WRONLY|O_CREAT|O_NOCTTY|O_APPEND|O_NONBLOCK)) >= 0) {
97 va_start(arguments, fmt);
98 vdprintf(fd, fmt, arguments);
99 va_end(arguments);
100 close(fd);
101 } else {
102 /* Always send console messages to /dev/console so people will see them. */
Eric Andersenb186d981999-12-03 09:19:54 +0000103 if ((fd = device_open(_PATH_CONSOLE, O_WRONLY|O_NOCTTY|O_NONBLOCK)) >= 0) {
Eric Andersen3843e961999-11-25 07:30:46 +0000104 va_start(arguments, fmt);
105 vdprintf(fd, fmt, arguments);
106 va_end(arguments);
107 close(fd);
108 } else {
109 fprintf(stderr, "Bummer, can't print: ");
110 va_start(arguments, fmt);
111 vfprintf(stderr, fmt, arguments);
112 fflush(stderr);
113 va_end(arguments);
114 }
Eric Andersenb99df0f1999-11-24 09:04:33 +0000115 }
Eric Andersenb99df0f1999-11-24 09:04:33 +0000116}
117
Eric Andersen3843e961999-11-25 07:30:46 +0000118static void logMessage( int pri, char* msg)
119{
120 time_t now;
121 char *timestamp;
122 static char res[20];
123 CODE *c_pri, *c_fac;
Eric Andersenb99df0f1999-11-24 09:04:33 +0000124
Eric Andersen3843e961999-11-25 07:30:46 +0000125 for (c_fac=facilitynames; c_fac->c_name && !(c_fac->c_val==LOG_FAC(pri)<<3); c_fac++);
126 for (c_pri=prioritynames; c_pri->c_name && !(c_pri->c_val==LOG_PRI(pri)); c_pri++);
127 if (*c_fac->c_name=='\0' || *c_pri->c_name=='\0')
128 snprintf (res, sizeof(res), "<%d>", pri);
129 else
130 snprintf (res, sizeof(res), "%s.%s", c_fac->c_name, c_pri->c_name);
131
132 if (strlen(msg) < 16 || msg[3] != ' ' || msg[6] != ' ' ||
133 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
134 {
135 time(&now);
136 timestamp = ctime(&now) + 4;
137 timestamp[15] = '\0';
138 } else {
139 timestamp = msg;
140 timestamp[15] = '\0';
141 msg += 16;
142 }
143
144 /* todo: supress duplicates */
145
146 /* now spew out the message to wherever it is supposed to go */
147 message( "%s %s %s %s\n", timestamp, LocalHostName, res, msg);
148}
149
150static void quit_signal(int sig)
151{
Eric Andersen14ec6cf1999-12-05 22:17:02 +0000152 logMessage(LOG_SYSLOG|LOG_INFO, "System log daemon exiting.");
153 unlink( _PATH_LOG);
Eric Andersen3843e961999-11-25 07:30:46 +0000154 exit( TRUE);
155}
156
157static void restart_signal(int sig)
158{
159 /* pretend to restart */
160 logMessage(LOG_SYSLOG|LOG_INFO, "syslogd restarting");
161}
162
163static void domark(int sig)
164{
165 if (MarkInterval > 0) {
166 logMessage(LOG_SYSLOG|LOG_INFO, "-- MARK --");
Eric Andersen3843e961999-11-25 07:30:46 +0000167 alarm(MarkInterval);
168 }
169}
170
171static void doSyslogd(void)
172{
173 struct sockaddr_un sunx;
Eric Andersenb99df0f1999-11-24 09:04:33 +0000174 int fd, conn;
175 size_t addrLength;
Eric Andersen3843e961999-11-25 07:30:46 +0000176 char buf[1024];
177 char *q, *p = buf;
178 int readSize;
Eric Andersenb99df0f1999-11-24 09:04:33 +0000179
Eric Andersen3843e961999-11-25 07:30:46 +0000180 /* Set up sig handlers */
181 signal(SIGINT, quit_signal);
182 signal(SIGTERM, quit_signal);
183 signal(SIGQUIT, quit_signal);
184 signal(SIGHUP, restart_signal);
185 signal(SIGALRM, domark);
186 alarm(MarkInterval);
Eric Andersenb99df0f1999-11-24 09:04:33 +0000187
Erik Andersenfac10d72000-02-07 05:29:42 +0000188 /* Remove any preexisting socket/file */
189 unlink(_PATH_LOG);
Eric Andersen14ec6cf1999-12-05 22:17:02 +0000190
Eric Andersen3843e961999-11-25 07:30:46 +0000191 memset(&sunx, 0, sizeof(sunx));
192 sunx.sun_family = AF_UNIX; /* Unix domain socket */
193 strncpy(sunx.sun_path, _PATH_LOG, sizeof(sunx.sun_path));
Eric Andersen14ec6cf1999-12-05 22:17:02 +0000194 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0 ) {
Eric Andersen3843e961999-11-25 07:30:46 +0000195 perror("Couldn't obtain descriptor for socket " _PATH_LOG);
196 exit( FALSE);
197 }
198
199 addrLength = sizeof(sunx.sun_family) + strlen(sunx.sun_path);
200 if ( (bind(fd, (struct sockaddr *) &sunx, addrLength)) ||
Erik Andersenfac10d72000-02-07 05:29:42 +0000201 (listen(fd, 5)) )
Eric Andersen3843e961999-11-25 07:30:46 +0000202 {
203 perror("Could not connect to socket " _PATH_LOG);
204 exit( FALSE);
205 }
206
Erik Andersenfac10d72000-02-07 05:29:42 +0000207 umask(0);
208 if (chmod(_PATH_LOG, 0666) < 0) {
209 perror("Could not set permission on " _PATH_LOG);
210 exit (FALSE);
211 }
Eric Andersen3843e961999-11-25 07:30:46 +0000212
Eric Andersen3843e961999-11-25 07:30:46 +0000213 logMessage(LOG_SYSLOG|LOG_INFO, "syslogd started: "
Eric Andersen14ec6cf1999-12-05 22:17:02 +0000214 "BusyBox v" BB_VER " (" BB_BT ")");
Eric Andersenb99df0f1999-11-24 09:04:33 +0000215
216
Eric Andersen3843e961999-11-25 07:30:46 +0000217 while ((conn = accept(fd, (struct sockaddr *) &sunx,
218 &addrLength)) >= 0)
219 {
220 while ((readSize=read(conn, buf, sizeof(buf))) > 0)
221 {
222 char line[1025];
223 unsigned char c;
224 int pri = (LOG_USER|LOG_NOTICE);
Eric Andersenb99df0f1999-11-24 09:04:33 +0000225
Eric Andersen3843e961999-11-25 07:30:46 +0000226 memset (line, 0, sizeof(line));
227 p = buf;
228 q = line;
229 while ( p && (c = *p) && q < &line[sizeof(line) - 1]) {
230 if (c == '<') {
231 /* Parse the magic priority number */
232 pri = 0;
233 while (isdigit(*(++p))) {
234 pri = 10 * pri + (*p - '0');
235 }
236 if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
237 pri = (LOG_USER|LOG_NOTICE);
238 } else if (c == '\n') {
239 *q++ = ' ';
240 } else if (iscntrl(c)&&(c<0177)) {
241 *q++ = '^';
242 *q++ = c ^ 0100;
243 } else {
244 *q++ = c;
245 }
246 p++;
247 }
248 *q = '\0';
Eric Andersenb99df0f1999-11-24 09:04:33 +0000249
Eric Andersen3843e961999-11-25 07:30:46 +0000250 /* Now log it */
251 logMessage( pri, line);
252 }
Eric Andersenb99df0f1999-11-24 09:04:33 +0000253 close(conn);
254 }
255
Eric Andersenb99df0f1999-11-24 09:04:33 +0000256 close(fd);
Eric Andersenb99df0f1999-11-24 09:04:33 +0000257}
258
Eric Andersen2cb55071999-12-10 08:25:07 +0000259#ifdef BB_KLOGD
260
Eric Andersenb186d981999-12-03 09:19:54 +0000261static void klogd_signal(int sig)
262{
Eric Andersen0ecb54a1999-12-05 23:24:55 +0000263 ksyslog(7, NULL, 0);
264 ksyslog(0, 0, 0);
Eric Andersen14ec6cf1999-12-05 22:17:02 +0000265 logMessage(LOG_SYSLOG|LOG_INFO, "Kernel log daemon exiting.");
Eric Andersenb186d981999-12-03 09:19:54 +0000266 exit( TRUE);
267}
268
Eric Andersenb186d981999-12-03 09:19:54 +0000269static void doKlogd(void)
270{
271 int priority=LOG_INFO;
Eric Andersenb186d981999-12-03 09:19:54 +0000272 char log_buffer[4096];
Eric Andersen14ec6cf1999-12-05 22:17:02 +0000273 char *logp;
Eric Andersenb186d981999-12-03 09:19:54 +0000274
275 /* Set up sig handlers */
276 signal(SIGINT, klogd_signal);
277 signal(SIGKILL, klogd_signal);
278 signal(SIGTERM, klogd_signal);
279 signal(SIGHUP, klogd_signal);
280 logMessage(LOG_SYSLOG|LOG_INFO, "klogd started: "
Eric Andersen14ec6cf1999-12-05 22:17:02 +0000281 "BusyBox v" BB_VER " (" BB_BT ")");
Eric Andersenb186d981999-12-03 09:19:54 +0000282
Eric Andersen14ec6cf1999-12-05 22:17:02 +0000283 ksyslog(1, NULL, 0);
Eric Andersen0ecb54a1999-12-05 23:24:55 +0000284
Eric Andersenb186d981999-12-03 09:19:54 +0000285 while (1) {
Eric Andersen0ecb54a1999-12-05 23:24:55 +0000286 /* Use kernel syscalls */
Eric Andersenb186d981999-12-03 09:19:54 +0000287 memset(log_buffer, '\0', sizeof(log_buffer));
Eric Andersenb186d981999-12-03 09:19:54 +0000288 if ( ksyslog(2, log_buffer, sizeof(log_buffer)) < 0 ) {
289 char message[80];
290 if ( errno == EINTR )
291 continue;
292 snprintf(message, 79, "klogd: Error return from sys_sycall: " \
293 "%d - %s.\n", errno, strerror(errno));
294 logMessage(LOG_SYSLOG|LOG_ERR, message);
295 exit(1);
296 }
Eric Andersen14ec6cf1999-12-05 22:17:02 +0000297 logp=log_buffer;
Eric Andersenb186d981999-12-03 09:19:54 +0000298 if ( *log_buffer == '<' )
299 {
300 switch ( *(log_buffer+1) )
301 {
302 case '0':
303 priority = LOG_EMERG;
304 break;
305 case '1':
306 priority = LOG_ALERT;
307 break;
308 case '2':
309 priority = LOG_CRIT;
310 break;
311 case '3':
312 priority = LOG_ERR;
313 break;
314 case '4':
315 priority = LOG_WARNING;
316 break;
317 case '5':
318 priority = LOG_NOTICE;
319 break;
320 case '6':
321 priority = LOG_INFO;
322 break;
323 case '7':
324 default:
325 priority = LOG_DEBUG;
326 }
Eric Andersen14ec6cf1999-12-05 22:17:02 +0000327 logp+=3;
Eric Andersenb186d981999-12-03 09:19:54 +0000328 }
Eric Andersen14ec6cf1999-12-05 22:17:02 +0000329 logMessage(LOG_KERN|priority, logp);
Eric Andersenb186d981999-12-03 09:19:54 +0000330 }
331
332}
333
Eric Andersen2cb55071999-12-10 08:25:07 +0000334#endif
Eric Andersenb99df0f1999-11-24 09:04:33 +0000335
Eric Andersen3843e961999-11-25 07:30:46 +0000336extern int syslogd_main(int argc, char **argv)
337{
Eric Andersenb186d981999-12-03 09:19:54 +0000338 int pid, klogd_pid;
Eric Andersen3843e961999-11-25 07:30:46 +0000339 int doFork = TRUE;
Eric Andersen2cb55071999-12-10 08:25:07 +0000340#ifdef BB_KLOGD
341 int startKlogd = TRUE;
342#endif
Erik Andersen05df2392000-01-13 04:43:48 +0000343 int stopDoingThat = FALSE;
Eric Andersen14ec6cf1999-12-05 22:17:02 +0000344 char *p;
Eric Andersenb186d981999-12-03 09:19:54 +0000345 char **argv1=argv;
Eric Andersen14ec6cf1999-12-05 22:17:02 +0000346
Eric Andersenb186d981999-12-03 09:19:54 +0000347 while (--argc > 0 && **(++argv1) == '-') {
Erik Andersen05df2392000-01-13 04:43:48 +0000348 stopDoingThat = FALSE;
349 while (stopDoingThat == FALSE && *(++(*argv1))) {
Eric Andersenb186d981999-12-03 09:19:54 +0000350 switch (**argv1) {
Eric Andersen3843e961999-11-25 07:30:46 +0000351 case 'm':
352 if (--argc == 0) {
353 usage(syslogd_usage);
354 }
Eric Andersenb186d981999-12-03 09:19:54 +0000355 MarkInterval = atoi(*(++argv1))*60;
Eric Andersen3843e961999-11-25 07:30:46 +0000356 break;
357 case 'n':
358 doFork = FALSE;
359 break;
Eric Andersen2cb55071999-12-10 08:25:07 +0000360#ifdef BB_KLOGD
361 case 'K':
362 startKlogd = FALSE;
363 break;
364#endif
Eric Andersen3843e961999-11-25 07:30:46 +0000365 case 'O':
366 if (--argc == 0) {
367 usage(syslogd_usage);
368 }
Eric Andersenb186d981999-12-03 09:19:54 +0000369 logFilePath = *(++argv1);
Erik Andersen05df2392000-01-13 04:43:48 +0000370 stopDoingThat = TRUE;
Eric Andersen3843e961999-11-25 07:30:46 +0000371 break;
372 default:
373 usage(syslogd_usage);
374 }
375 }
376 }
Eric Andersen14ec6cf1999-12-05 22:17:02 +0000377
378 /* Store away localhost's name before the fork */
379 gethostname(LocalHostName, sizeof(LocalHostName));
380 if ( (p = strchr(LocalHostName, '.')) ) {
381 *p++ = '\0';
382 }
Eric Andersen3843e961999-11-25 07:30:46 +0000383
384 if (doFork == TRUE) {
385 pid = fork();
386 if ( pid < 0 )
387 exit( pid);
388 else if ( pid == 0 ) {
Eric Andersenb186d981999-12-03 09:19:54 +0000389 strncpy(argv[0], "syslogd",strlen(argv[0]));
Eric Andersen3843e961999-11-25 07:30:46 +0000390 doSyslogd();
391 }
392 } else {
393 doSyslogd();
394 }
Eric Andersenb186d981999-12-03 09:19:54 +0000395
Eric Andersen2cb55071999-12-10 08:25:07 +0000396#ifdef BB_KLOGD
Eric Andersen14ec6cf1999-12-05 22:17:02 +0000397 /* Start up the klogd process */
Eric Andersen2cb55071999-12-10 08:25:07 +0000398 if (startKlogd == TRUE) {
399 klogd_pid = fork();
400 if (klogd_pid == 0 ) {
401 strncpy(argv[0], "klogd", strlen(argv[0]));
402 doKlogd();
403 }
Eric Andersenb186d981999-12-03 09:19:54 +0000404 }
Eric Andersen2cb55071999-12-10 08:25:07 +0000405#endif
Eric Andersenb186d981999-12-03 09:19:54 +0000406
Eric Andersen3843e961999-11-25 07:30:46 +0000407 exit( TRUE);
408}
409
Eric Andersenb99df0f1999-11-24 09:04:33 +0000410