+/* vi: set sw=4 ts=4: */
/*
* Mini syslogd implementation for busybox
*
- * Copyright (C) 1999 by Lineo, inc.
+ * Copyright (C) 1999,2000 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
*
+ * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
*
*/
-#include "internal.h"
+#include "busybox.h"
#include <stdio.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-#include <unistd.h>
-#include <time.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <signal.h>
+#include <stdlib.h>
#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
#include <netdb.h>
+#include <paths.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <sys/param.h>
+
+#if ! defined __GLIBC__ && ! defined __UCLIBC__
+
+typedef unsigned int socklen_t;
+
+#ifndef __alpha__
+# define __NR_klogctl __NR_syslog
+static inline _syscall3(int, klogctl, int, type, char *, b, int, len);
+#else /* __alpha__ */
+#define klogctl syslog
+#endif
+
+#else
+# include <sys/klog.h>
+#endif
+
/* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
#define SYSLOG_NAMES
#include <sys/syslog.h>
+#include <sys/uio.h>
/* Path for the file where all log messages are written */
-#define __LOG_FILE "/var/log/messages"
-/* Path to the current console device */
-#define __DEV_CONSOLE "/dev/console"
+#define __LOG_FILE "/var/log/messages"
+
+/* Path to the unix socket */
+char lfile[BUFSIZ] = "";
+static char *logFilePath = __LOG_FILE;
-static char* logFilePath = __LOG_FILE;
/* interval between marks in seconds */
-static int MarkInterval = 20*60;
+static int MarkInterval = 20 * 60;
+
/* localhost's name */
static char LocalHostName[32];
-static const char syslogd_usage[] =
- "syslogd [OPTION]...\n\n"
- "Linux system logging utility.\n\n"
- "Options:\n"
- "\t-m\tChange the mark timestamp interval. default=20min. 0=off\n"
- "\t-n\tDo not fork into the background (for when run by init)\n"
- "\t-O\tSpecify an alternate log file. default=/var/log/messages\n";
+#ifdef BB_FEATURE_REMOTE_LOG
+#include <netinet/in.h>
+/* udp socket for logging to remote host */
+static int remotefd = -1;
+/* where do we log? */
+static char *RemoteHost;
+/* what port to log to? */
+static int RemotePort = 514;
+/* To remote log or not to remote log, that is the question. */
+static int doRemoteLog = FALSE;
+#endif
+
+/* Note: There is also a function called "message()" in init.c */
+/* Print a message to the log file. */
+static void message (char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
+static void message (char *fmt, ...)
+{
+ int fd;
+ struct flock fl;
+ va_list arguments;
+
+ fl.l_whence = SEEK_SET;
+ fl.l_start = 0;
+ fl.l_len = 1;
+
+ if ((fd = device_open (logFilePath,
+ O_WRONLY | O_CREAT | O_NOCTTY | O_APPEND |
+ O_NONBLOCK)) >= 0) {
+ fl.l_type = F_WRLCK;
+ fcntl (fd, F_SETLKW, &fl);
+ va_start (arguments, fmt);
+ vdprintf (fd, fmt, arguments);
+ va_end (arguments);
+ fl.l_type = F_UNLCK;
+ fcntl (fd, F_SETLKW, &fl);
+ close (fd);
+ } else {
+ /* Always send console messages to /dev/console so people will see them. */
+ if ((fd = device_open (_PATH_CONSOLE,
+ O_WRONLY | O_NOCTTY | O_NONBLOCK)) >= 0) {
+ va_start (arguments, fmt);
+ vdprintf (fd, fmt, arguments);
+ va_end (arguments);
+ close (fd);
+ } else {
+ fprintf (stderr, "Bummer, can't print: ");
+ va_start (arguments, fmt);
+ vfprintf (stderr, fmt, arguments);
+ fflush (stderr);
+ va_end (arguments);
+ }
+ }
+}
+
+static void logMessage (int pri, char *msg)
+{
+ time_t now;
+ char *timestamp;
+ static char res[20] = "";
+ CODE *c_pri, *c_fac;
+
+ if (pri != 0) {
+ for (c_fac = facilitynames;
+ c_fac->c_name && !(c_fac->c_val == LOG_FAC(pri) << 3); c_fac++);
+ for (c_pri = prioritynames;
+ c_pri->c_name && !(c_pri->c_val == LOG_PRI(pri)); c_pri++);
+ if (*c_fac->c_name == '\0' || *c_pri->c_name == '\0')
+ snprintf(res, sizeof(res), "<%d>", pri);
+ else
+ snprintf(res, sizeof(res), "%s.%s", c_fac->c_name, c_pri->c_name);
+ }
+ if (strlen(msg) < 16 || msg[3] != ' ' || msg[6] != ' ' ||
+ msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') {
+ time(&now);
+ timestamp = ctime(&now) + 4;
+ timestamp[15] = '\0';
+ } else {
+ timestamp = msg;
+ timestamp[15] = '\0';
+ msg += 16;
+ }
+
+ /* todo: supress duplicates */
+
+ /* now spew out the message to wherever it is supposed to go */
+ message("%s %s %s %s\n", timestamp, LocalHostName, res, msg);
+
+#ifdef BB_FEATURE_REMOTE_LOG
+ /* send message to remote logger */
+ if ( -1 != remotefd){
+#define IOV_COUNT 2
+ struct iovec iov[IOV_COUNT];
+ struct iovec *v = iov;
+
+ bzero(&res, sizeof(res));
+ snprintf(res, sizeof(res), "<%d>", pri);
+ v->iov_base = res ;
+ v->iov_len = strlen(res);
+ v++;
+
+ v->iov_base = msg;
+ v->iov_len = strlen(msg);
+
+ if ( -1 == writev(remotefd,iov, IOV_COUNT)){
+ fatalError("syslogd: cannot write to remote file handle on"
+ "%s:%d\n",RemoteHost,RemotePort);
+ }
+ }
+#endif
+}
-/* try to open up the specified device */
-static int device_open(char *device, int mode)
+static void quit_signal(int sig)
{
- int m, f, fd = -1;
-
- m = mode | O_NONBLOCK;
-
- /* Retry up to 5 times */
- for (f = 0; f < 5; f++)
- if ((fd = open(device, m)) >= 0)
- break;
- if (fd < 0)
- return fd;
- /* Reset original flags. */
- if (m != mode)
- fcntl(fd, F_SETFL, mode);
- return fd;
+ logMessage(0, "System log daemon exiting.");
+ unlink(lfile);
+ exit(TRUE);
}
-/* print a message to the log file */
-static void message(char *fmt, ...)
+static void domark(int sig)
{
- int fd;
- va_list arguments;
-
- if ((fd = device_open(logFilePath, O_WRONLY|O_CREAT|O_NOCTTY|O_APPEND|O_NONBLOCK)) >= 0) {
- va_start(arguments, fmt);
- vdprintf(fd, fmt, arguments);
- va_end(arguments);
- close(fd);
- } else {
- /* Always send console messages to /dev/console so people will see them. */
- if ((fd = device_open(__DEV_CONSOLE, O_WRONLY|O_NOCTTY|O_NONBLOCK)) >= 0) {
- va_start(arguments, fmt);
- vdprintf(fd, fmt, arguments);
- va_end(arguments);
- close(fd);
- } else {
- fprintf(stderr, "Bummer, can't print: ");
- va_start(arguments, fmt);
- vfprintf(stderr, fmt, arguments);
- fflush(stderr);
- va_end(arguments);
+ if (MarkInterval > 0) {
+ logMessage(LOG_SYSLOG | LOG_INFO, "-- MARK --");
+ alarm(MarkInterval);
}
- }
}
-static void logMessage( int pri, char* msg)
+#define BUFSIZE 1023
+static int serveConnection (int conn)
{
- time_t now;
- char *timestamp;
- static char res[20];
- CODE *c_pri, *c_fac;
-
- for (c_fac=facilitynames; c_fac->c_name && !(c_fac->c_val==LOG_FAC(pri)<<3); c_fac++);
- for (c_pri=prioritynames; c_pri->c_name && !(c_pri->c_val==LOG_PRI(pri)); c_pri++);
- if (*c_fac->c_name=='\0' || *c_pri->c_name=='\0')
- snprintf (res, sizeof(res), "<%d>", pri);
- else
- snprintf (res, sizeof(res), "%s.%s", c_fac->c_name, c_pri->c_name);
-
- if (strlen(msg) < 16 || msg[3] != ' ' || msg[6] != ' ' ||
- msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
- {
- time(&now);
- timestamp = ctime(&now) + 4;
- timestamp[15] = '\0';
- } else {
- timestamp = msg;
- timestamp[15] = '\0';
- msg += 16;
- }
-
- /* todo: supress duplicates */
-
- /* now spew out the message to wherever it is supposed to go */
- message( "%s %s %s %s\n", timestamp, LocalHostName, res, msg);
+ char buf[ BUFSIZE + 1 ];
+ int n_read;
+
+ while ((n_read = read (conn, buf, BUFSIZE )) > 0) {
+
+ int pri = (LOG_USER | LOG_NOTICE);
+ char line[ BUFSIZE + 1 ];
+ unsigned char c;
+
+ char *p = buf, *q = line;
+
+ buf[ n_read - 1 ] = '\0';
+
+ while (p && (c = *p) && q < &line[ sizeof (line) - 1 ]) {
+ if (c == '<') {
+ /* Parse the magic priority number. */
+ pri = 0;
+ while (isdigit (*(++p))) {
+ pri = 10 * pri + (*p - '0');
+ }
+ if (pri & ~(LOG_FACMASK | LOG_PRIMASK)){
+ pri = (LOG_USER | LOG_NOTICE);
+ }
+ } else if (c == '\n') {
+ *q++ = ' ';
+ } else if (iscntrl (c) && (c < 0177)) {
+ *q++ = '^';
+ *q++ = c ^ 0100;
+ } else {
+ *q++ = c;
+ }
+ p++;
+ }
+ *q = '\0';
+ /* Now log it */
+ logMessage (pri, line);
+ }
+ return (0);
}
-static void quit_signal(int sig)
-{
- logMessage(LOG_SYSLOG|LOG_INFO, "syslogd exiting");
- exit( TRUE);
+
+#ifdef BB_FEATURE_REMOTE_LOG
+static void init_RemoteLog (void){
+
+ struct sockaddr_in remoteaddr;
+ struct hostent *hostinfo;
+ int len = sizeof(remoteaddr);
+
+ bzero(&remoteaddr, len);
+
+ remotefd = socket(AF_INET, SOCK_DGRAM, 0);
+
+ if (remotefd < 0) {
+ fatalError("syslogd: cannot create socket\n");
+ }
+
+ hostinfo = (struct hostent *) gethostbyname(RemoteHost);
+
+ if (!hostinfo) {
+ fatalError("syslogd: cannot resolve remote host name [%s]\n", RemoteHost);
+ }
+
+ remoteaddr.sin_family = AF_INET;
+ remoteaddr.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
+ remoteaddr.sin_port = htons(RemotePort);
+
+ /*
+ Since we are using UDP sockets, connect just sets the default host and port
+ for future operations
+ */
+ if ( 0 != (connect(remotefd, (struct sockaddr *) &remoteaddr, len))){
+ fatalError("syslogd: cannot connect to remote host %s:%d\n", RemoteHost, RemotePort);
+ }
+
}
+#endif
-static void restart_signal(int sig)
+static void doSyslogd (void) __attribute__ ((noreturn));
+static void doSyslogd (void)
{
- /* pretend to restart */
- logMessage(LOG_SYSLOG|LOG_INFO, "syslogd restarting");
+ struct sockaddr_un sunx;
+ socklen_t addrLength;
+
+
+ int sock_fd;
+ fd_set fds;
+
+ char lfile[BUFSIZ];
+
+ /* Set up signal handlers. */
+ signal (SIGINT, quit_signal);
+ signal (SIGTERM, quit_signal);
+ signal (SIGQUIT, quit_signal);
+ signal (SIGHUP, SIG_IGN);
+ signal (SIGCHLD, SIG_IGN);
+#ifdef SIGCLD
+ signal (SIGCLD, SIG_IGN);
+#endif
+ signal (SIGALRM, domark);
+ alarm (MarkInterval);
+
+ /* Create the syslog file so realpath() can work. */
+ close (open (_PATH_LOG, O_RDWR | O_CREAT, 0644));
+ if (realpath (_PATH_LOG, lfile) == NULL)
+ fatalError ("Could not resolve path to " _PATH_LOG ": %s\n", strerror (errno));
+
+ unlink (lfile);
+
+ memset (&sunx, 0, sizeof (sunx));
+ sunx.sun_family = AF_UNIX;
+ strncpy (sunx.sun_path, lfile, sizeof (sunx.sun_path));
+ if ((sock_fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
+ fatalError ("Couldn't obtain descriptor for socket " _PATH_LOG ": %s\n", strerror (errno));
+
+ addrLength = sizeof (sunx.sun_family) + strlen (sunx.sun_path);
+ if ((bind (sock_fd, (struct sockaddr *) &sunx, addrLength)) || (listen (sock_fd, 5)))
+ fatalError ("Could not connect to socket " _PATH_LOG ": %s\n", strerror (errno));
+
+ if (chmod (lfile, 0666) < 0)
+ fatalError ("Could not set permission on " _PATH_LOG ": %s\n", strerror (errno));
+
+ FD_ZERO (&fds);
+ FD_SET (sock_fd, &fds);
+
+ #ifdef BB_FEATURE_REMOTE_LOG
+ if (doRemoteLog == TRUE){
+ init_RemoteLog();
+ }
+ #endif
+
+ logMessage (0, "syslogd started: BusyBox v" BB_VER " (" BB_BT ")");
+
+ for (;;) {
+
+ fd_set readfds;
+ int n_ready;
+ int fd;
+
+ memcpy (&readfds, &fds, sizeof (fds));
+
+ if ((n_ready = select (FD_SETSIZE, &readfds, NULL, NULL, NULL)) < 0) {
+ if (errno == EINTR) continue; /* alarm may have happened. */
+ fatalError ("select error: %s\n", strerror (errno));
+ }
+
+ for (fd = 0; (n_ready > 0) && (fd < FD_SETSIZE); fd++) {
+ if (FD_ISSET (fd, &readfds)) {
+
+ --n_ready;
+
+ if (fd == sock_fd) {
+
+ int conn;
+ pid_t pid;
+
+ if ((conn = accept (sock_fd, (struct sockaddr *) &sunx, &addrLength)) < 0) {
+ fatalError ("accept error: %s\n", strerror (errno));
+ }
+
+ pid = fork();
+
+ if (pid < 0) {
+ perror ("syslogd: fork");
+ close (conn);
+ continue;
+ }
+
+ if (pid == 0) {
+ serveConnection (conn);
+ close (conn);
+ exit( TRUE);
+ }
+ close (conn);
+ }
+ }
+ }
+ }
}
-static void domark(int sig)
+#ifdef BB_FEATURE_KLOGD
+
+static void klogd_signal(int sig)
{
- if (MarkInterval > 0) {
- logMessage(LOG_SYSLOG|LOG_INFO, "-- MARK --");
- signal(SIGALRM, domark);
- alarm(MarkInterval);
- }
+ klogctl(7, NULL, 0);
+ klogctl(0, 0, 0);
+ logMessage(0, "Kernel log daemon exiting.");
+ exit(TRUE);
}
-static void doSyslogd(void)
+static void doKlogd (void) __attribute__ ((noreturn));
+static void doKlogd (void)
{
- struct sockaddr_un sunx;
- int fd, conn;
- size_t addrLength;
- char buf[1024];
- char *q, *p = buf;
- int readSize;
-
- /* Remove any preexisting socket/file */
- unlink(_PATH_LOG);
-
- /* Set up sig handlers */
- signal(SIGINT, quit_signal);
- signal(SIGTERM, quit_signal);
- signal(SIGQUIT, quit_signal);
- signal(SIGHUP, restart_signal);
- signal(SIGALRM, domark);
- alarm(MarkInterval);
-
- memset(&sunx, 0, sizeof(sunx));
- sunx.sun_family = AF_UNIX; /* Unix domain socket */
- strncpy(sunx.sun_path, _PATH_LOG, sizeof(sunx.sun_path));
- if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0 ) {
- perror("Couldn't obtain descriptor for socket " _PATH_LOG);
- exit( FALSE);
- }
-
- addrLength = sizeof(sunx.sun_family) + strlen(sunx.sun_path);
- if ( (bind(fd, (struct sockaddr *) &sunx, addrLength)) ||
- (chmod(_PATH_LOG, 0666) < 0) ||
- (listen(fd, 5)) )
- {
- perror("Could not connect to socket " _PATH_LOG);
- exit( FALSE);
- }
-
-
- /* Get localhost's name */
- gethostname(LocalHostName, sizeof(LocalHostName));
- if ( (p = strchr(LocalHostName, '.')) ) {
- *p++ = '\0';
- }
-
- logMessage(LOG_SYSLOG|LOG_INFO, "syslogd started: "
- "BusyBox v" BB_VER " (" BB_BT ") multi-call binary");
-
-
- while ((conn = accept(fd, (struct sockaddr *) &sunx,
- &addrLength)) >= 0)
- {
- while ((readSize=read(conn, buf, sizeof(buf))) > 0)
- {
- char line[1025];
- unsigned char c;
- int pri = (LOG_USER|LOG_NOTICE);
-
- memset (line, 0, sizeof(line));
- p = buf;
- q = line;
- while ( p && (c = *p) && q < &line[sizeof(line) - 1]) {
- if (c == '<') {
- /* Parse the magic priority number */
- pri = 0;
- while (isdigit(*(++p))) {
- pri = 10 * pri + (*p - '0');
- }
- if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
- pri = (LOG_USER|LOG_NOTICE);
- } else if (c == '\n') {
- *q++ = ' ';
- } else if (iscntrl(c)&&(c<0177)) {
- *q++ = '^';
- *q++ = c ^ 0100;
- } else {
- *q++ = c;
+ int priority = LOG_INFO;
+ char log_buffer[4096];
+ char *logp;
+
+ /* Set up sig handlers */
+ signal(SIGINT, klogd_signal);
+ signal(SIGKILL, klogd_signal);
+ signal(SIGTERM, klogd_signal);
+ signal(SIGHUP, SIG_IGN);
+
+#ifdef BB_FEATURE_REMOTE_LOG
+ if (doRemoteLog == TRUE){
+ init_RemoteLog();
+ }
+#endif
+
+ logMessage(0, "klogd started: "
+ "BusyBox v" BB_VER " (" BB_BT ")");
+
+ klogctl(1, NULL, 0);
+
+ while (1) {
+ /* Use kernel syscalls */
+ memset(log_buffer, '\0', sizeof(log_buffer));
+ if (klogctl(2, log_buffer, sizeof(log_buffer)) < 0) {
+ char message[80];
+
+ if (errno == EINTR)
+ continue;
+ snprintf(message, 79, "klogd: Error return from sys_sycall: " \
+ "%d - %s.\n", errno, strerror(errno));
+ logMessage(LOG_SYSLOG | LOG_ERR, message);
+ exit(1);
}
- p++;
- }
- *q = '\0';
-
- /* Now log it */
- logMessage( pri, line);
+ logp = log_buffer;
+ if (*log_buffer == '<') {
+ switch (*(log_buffer + 1)) {
+ case '0':
+ priority = LOG_EMERG;
+ break;
+ case '1':
+ priority = LOG_ALERT;
+ break;
+ case '2':
+ priority = LOG_CRIT;
+ break;
+ case '3':
+ priority = LOG_ERR;
+ break;
+ case '4':
+ priority = LOG_WARNING;
+ break;
+ case '5':
+ priority = LOG_NOTICE;
+ break;
+ case '6':
+ priority = LOG_INFO;
+ break;
+ case '7':
+ default:
+ priority = LOG_DEBUG;
+ }
+ logp += 3;
+ }
+ logMessage(LOG_KERN | priority, logp);
}
- close(conn);
- }
- close(fd);
}
+#endif
+
+static void daemon_init (char **argv, char *dz, void fn (void))
+{
+ setsid();
+ chdir ("/");
+ strncpy(argv[0], dz, strlen(argv[0]));
+ fn();
+ exit(0);
+}
extern int syslogd_main(int argc, char **argv)
{
- int pid;
- int doFork = TRUE;
-
- while (--argc > 0 && **(++argv) == '-') {
- while (*(++(*argv))) {
- switch (**argv) {
- case 'm':
- if (--argc == 0) {
- usage(syslogd_usage);
- }
- MarkInterval = atoi(*(++argv))*60;
- break;
- case 'n':
- doFork = FALSE;
- break;
- case 'O':
- if (--argc == 0) {
- usage(syslogd_usage);
+ int pid, klogd_pid;
+ int doFork = TRUE;
+
+#ifdef BB_FEATURE_KLOGD
+ int startKlogd = TRUE;
+#endif
+ int stopDoingThat = FALSE;
+ char *p;
+ char **argv1 = argv;
+
+ while (--argc > 0 && **(++argv1) == '-') {
+ stopDoingThat = FALSE;
+ while (stopDoingThat == FALSE && *(++(*argv1))) {
+ switch (**argv1) {
+ case 'm':
+ if (--argc == 0) {
+ usage(syslogd_usage);
+ }
+ MarkInterval = atoi(*(++argv1)) * 60;
+ break;
+ case 'n':
+ doFork = FALSE;
+ break;
+#ifdef BB_FEATURE_KLOGD
+ case 'K':
+ startKlogd = FALSE;
+ break;
+#endif
+ case 'O':
+ if (--argc == 0) {
+ usage(syslogd_usage);
+ }
+ logFilePath = *(++argv1);
+ stopDoingThat = TRUE;
+ break;
+#ifdef BB_FEATURE_REMOTE_LOG
+ case 'R':
+ if (--argc == 0) {
+ usage(syslogd_usage);
+ }
+ RemoteHost = *(++argv1);
+ if ( (p = strchr(RemoteHost, ':'))){
+ RemotePort = atoi(p+1);
+ *p = '\0';
+ }
+ doRemoteLog = TRUE;
+ stopDoingThat = TRUE;
+ break;
+#endif
+ default:
+ usage(syslogd_usage);
+ }
}
- logFilePath = *(++argv);
- break;
- default:
+ }
+
+ if (argc > 0)
usage(syslogd_usage);
- }
+
+ /* Store away localhost's name before the fork */
+ gethostname(LocalHostName, sizeof(LocalHostName));
+ if ((p = strchr(LocalHostName, '.'))) {
+ *p++ = '\0';
+ }
+
+ umask(0);
+
+#ifdef BB_FEATURE_KLOGD
+ /* Start up the klogd process */
+ if (startKlogd == TRUE) {
+ klogd_pid = fork();
+ if (klogd_pid == 0) {
+ daemon_init (argv, "klogd", doKlogd);
+ }
}
- }
-
- if (doFork == TRUE) {
- pid = fork();
- if ( pid < 0 )
- exit( pid);
- else if ( pid == 0 ) {
- doSyslogd();
+#endif
+
+ if (doFork == TRUE) {
+ pid = fork();
+ if (pid < 0)
+ exit(pid);
+ else if (pid == 0) {
+ daemon_init (argv, "syslogd", doSyslogd);
+ }
+ } else {
+ doSyslogd();
}
- } else {
- doSyslogd();
- }
- exit( TRUE);
-}
+ return(TRUE);
+}
+/*
+Local Variables
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/