mirror of
https://github.com/sheumann/hush.git
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405 lines
9.3 KiB
C
405 lines
9.3 KiB
C
/*
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* Mini syslogd implementation for busybox
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*
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* Copyright (C) 1999 by Lineo, inc.
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* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "internal.h"
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#include <stdio.h>
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#include <stdarg.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <ctype.h>
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#include <netdb.h>
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#include <sys/klog.h>
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#include <errno.h>
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#include <paths.h>
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#define ksyslog klogctl
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extern int ksyslog(int type, char *buf, int len);
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/* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
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#define SYSLOG_NAMES
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#include <sys/syslog.h>
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/* Path for the file where all log messages are written */
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#define __LOG_FILE "/var/log/messages"
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static char* logFilePath = __LOG_FILE;
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/* interval between marks in seconds */
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static int MarkInterval = 20*60;
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/* localhost's name */
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static char LocalHostName[32];
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static const char syslogd_usage[] =
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"syslogd [OPTION]...\n\n"
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"Linux system and kernel (provides klogd) logging utility.\n"
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"Note that this version of syslogd/klogd ignores /etc/syslog.conf.\n\n"
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"Options:\n"
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"\t-m\tChange the mark timestamp interval. default=20min. 0=off\n"
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"\t-n\tDo not fork into the background (for when run by init)\n"
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#ifdef BB_KLOGD
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"\t-K\tDo not start up the klogd process (by default syslogd spawns klogd).\n"
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#endif
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"\t-O\tSpecify an alternate log file. default=/var/log/messages\n";
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/* try to open up the specified device */
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static int device_open(char *device, int mode)
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{
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int m, f, fd = -1;
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m = mode | O_NONBLOCK;
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/* Retry up to 5 times */
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for (f = 0; f < 5; f++)
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if ((fd = open(device, m)) >= 0)
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break;
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if (fd < 0)
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return fd;
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/* Reset original flags. */
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if (m != mode)
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fcntl(fd, F_SETFL, mode);
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return fd;
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}
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/* print a message to the log file */
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static void message(char *fmt, ...)
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{
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int fd;
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va_list arguments;
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if ((fd = device_open(logFilePath, O_WRONLY|O_CREAT|O_NOCTTY|O_APPEND|O_NONBLOCK)) >= 0) {
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va_start(arguments, fmt);
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vdprintf(fd, fmt, arguments);
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va_end(arguments);
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close(fd);
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} else {
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/* Always send console messages to /dev/console so people will see them. */
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if ((fd = device_open(_PATH_CONSOLE, O_WRONLY|O_NOCTTY|O_NONBLOCK)) >= 0) {
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va_start(arguments, fmt);
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vdprintf(fd, fmt, arguments);
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va_end(arguments);
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close(fd);
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} else {
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fprintf(stderr, "Bummer, can't print: ");
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va_start(arguments, fmt);
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vfprintf(stderr, fmt, arguments);
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fflush(stderr);
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va_end(arguments);
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}
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}
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}
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static void logMessage( int pri, char* msg)
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{
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time_t now;
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char *timestamp;
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static char res[20];
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CODE *c_pri, *c_fac;
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for (c_fac=facilitynames; c_fac->c_name && !(c_fac->c_val==LOG_FAC(pri)<<3); c_fac++);
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for (c_pri=prioritynames; c_pri->c_name && !(c_pri->c_val==LOG_PRI(pri)); c_pri++);
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if (*c_fac->c_name=='\0' || *c_pri->c_name=='\0')
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snprintf (res, sizeof(res), "<%d>", pri);
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else
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snprintf (res, sizeof(res), "%s.%s", c_fac->c_name, c_pri->c_name);
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if (strlen(msg) < 16 || msg[3] != ' ' || msg[6] != ' ' ||
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msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
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{
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time(&now);
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timestamp = ctime(&now) + 4;
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timestamp[15] = '\0';
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} else {
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timestamp = msg;
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timestamp[15] = '\0';
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msg += 16;
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}
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/* todo: supress duplicates */
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/* now spew out the message to wherever it is supposed to go */
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message( "%s %s %s %s\n", timestamp, LocalHostName, res, msg);
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}
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static void quit_signal(int sig)
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{
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logMessage(LOG_SYSLOG|LOG_INFO, "System log daemon exiting.");
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unlink( _PATH_LOG);
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exit( TRUE);
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}
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static void restart_signal(int sig)
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{
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/* pretend to restart */
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logMessage(LOG_SYSLOG|LOG_INFO, "syslogd restarting");
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}
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static void domark(int sig)
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{
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if (MarkInterval > 0) {
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logMessage(LOG_SYSLOG|LOG_INFO, "-- MARK --");
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alarm(MarkInterval);
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}
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}
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static void doSyslogd(void)
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{
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struct sockaddr_un sunx;
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int fd, conn;
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size_t addrLength;
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char buf[1024];
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char *q, *p = buf;
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int readSize;
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/* Remove any preexisting socket/file */
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unlink(_PATH_LOG);
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/* Set up sig handlers */
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signal(SIGINT, quit_signal);
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signal(SIGTERM, quit_signal);
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signal(SIGQUIT, quit_signal);
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signal(SIGHUP, restart_signal);
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signal(SIGALRM, domark);
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alarm(MarkInterval);
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unlink( _PATH_LOG);
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memset(&sunx, 0, sizeof(sunx));
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sunx.sun_family = AF_UNIX; /* Unix domain socket */
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strncpy(sunx.sun_path, _PATH_LOG, sizeof(sunx.sun_path));
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if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0 ) {
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perror("Couldn't obtain descriptor for socket " _PATH_LOG);
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exit( FALSE);
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}
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addrLength = sizeof(sunx.sun_family) + strlen(sunx.sun_path);
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if ( (bind(fd, (struct sockaddr *) &sunx, addrLength)) ||
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(fchmod(fd, 0666) < 0) || (listen(fd, 5)) )
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{
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perror("Could not connect to socket " _PATH_LOG);
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exit( FALSE);
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}
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logMessage(LOG_SYSLOG|LOG_INFO, "syslogd started: "
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"BusyBox v" BB_VER " (" BB_BT ")");
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while ((conn = accept(fd, (struct sockaddr *) &sunx,
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&addrLength)) >= 0)
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{
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while ((readSize=read(conn, buf, sizeof(buf))) > 0)
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{
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char line[1025];
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unsigned char c;
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int pri = (LOG_USER|LOG_NOTICE);
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memset (line, 0, sizeof(line));
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p = buf;
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q = line;
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while ( p && (c = *p) && q < &line[sizeof(line) - 1]) {
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if (c == '<') {
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/* Parse the magic priority number */
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pri = 0;
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while (isdigit(*(++p))) {
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pri = 10 * pri + (*p - '0');
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}
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if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
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pri = (LOG_USER|LOG_NOTICE);
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} else if (c == '\n') {
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*q++ = ' ';
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} else if (iscntrl(c)&&(c<0177)) {
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*q++ = '^';
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*q++ = c ^ 0100;
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} else {
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*q++ = c;
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}
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p++;
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}
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*q = '\0';
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/* Now log it */
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logMessage( pri, line);
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}
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close(conn);
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}
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close(fd);
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}
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#ifdef BB_KLOGD
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static void klogd_signal(int sig)
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{
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ksyslog(7, NULL, 0);
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ksyslog(0, 0, 0);
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logMessage(LOG_SYSLOG|LOG_INFO, "Kernel log daemon exiting.");
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exit( TRUE);
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}
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static void doKlogd(void)
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{
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int priority=LOG_INFO;
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char log_buffer[4096];
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char *logp;
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/* Set up sig handlers */
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signal(SIGINT, klogd_signal);
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signal(SIGKILL, klogd_signal);
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signal(SIGTERM, klogd_signal);
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signal(SIGHUP, klogd_signal);
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logMessage(LOG_SYSLOG|LOG_INFO, "klogd started: "
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"BusyBox v" BB_VER " (" BB_BT ")");
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ksyslog(1, NULL, 0);
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while (1) {
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/* Use kernel syscalls */
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memset(log_buffer, '\0', sizeof(log_buffer));
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if ( ksyslog(2, log_buffer, sizeof(log_buffer)) < 0 ) {
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char message[80];
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if ( errno == EINTR )
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continue;
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snprintf(message, 79, "klogd: Error return from sys_sycall: " \
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"%d - %s.\n", errno, strerror(errno));
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logMessage(LOG_SYSLOG|LOG_ERR, message);
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exit(1);
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}
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logp=log_buffer;
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if ( *log_buffer == '<' )
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{
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switch ( *(log_buffer+1) )
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{
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case '0':
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priority = LOG_EMERG;
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break;
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case '1':
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priority = LOG_ALERT;
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break;
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case '2':
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priority = LOG_CRIT;
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break;
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case '3':
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priority = LOG_ERR;
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break;
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case '4':
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priority = LOG_WARNING;
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break;
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case '5':
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priority = LOG_NOTICE;
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break;
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case '6':
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priority = LOG_INFO;
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break;
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case '7':
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default:
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priority = LOG_DEBUG;
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}
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logp+=3;
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}
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logMessage(LOG_KERN|priority, logp);
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}
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}
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#endif
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extern int syslogd_main(int argc, char **argv)
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{
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int pid, klogd_pid;
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int doFork = TRUE;
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#ifdef BB_KLOGD
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int startKlogd = TRUE;
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#endif
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char *p;
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char **argv1=argv;
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while (--argc > 0 && **(++argv1) == '-') {
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while (*(++(*argv1))) {
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switch (**argv1) {
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case 'm':
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if (--argc == 0) {
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usage(syslogd_usage);
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}
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MarkInterval = atoi(*(++argv1))*60;
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break;
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case 'n':
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doFork = FALSE;
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break;
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#ifdef BB_KLOGD
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case 'K':
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startKlogd = FALSE;
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break;
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#endif
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case 'O':
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if (--argc == 0) {
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usage(syslogd_usage);
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}
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logFilePath = *(++argv1);
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break;
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default:
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usage(syslogd_usage);
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}
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}
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}
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/* Store away localhost's name before the fork */
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gethostname(LocalHostName, sizeof(LocalHostName));
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if ( (p = strchr(LocalHostName, '.')) ) {
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*p++ = '\0';
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}
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if (doFork == TRUE) {
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pid = fork();
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if ( pid < 0 )
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exit( pid);
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else if ( pid == 0 ) {
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strncpy(argv[0], "syslogd",strlen(argv[0]));
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doSyslogd();
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}
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} else {
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doSyslogd();
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}
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#ifdef BB_KLOGD
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/* Start up the klogd process */
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if (startKlogd == TRUE) {
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klogd_pid = fork();
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if (klogd_pid == 0 ) {
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strncpy(argv[0], "klogd", strlen(argv[0]));
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doKlogd();
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}
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}
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#endif
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exit( TRUE);
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}
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