mirror of
https://github.com/sheumann/hush.git
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489 lines
11 KiB
C
489 lines
11 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini syslogd implementation for busybox
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*
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* Copyright (C) 1999,2000 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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* Copyright (C) 2000 by Karl M. Hegbloom <karlheg@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 <stdlib.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <sys/param.h>
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#if ! defined __GLIBC__ && ! defined __UCLIBC__
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typedef unsigned int socklen_t;
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#ifndef __alpha__
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# define __NR_klogctl __NR_syslog
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static inline _syscall3(int, klogctl, int, type, char *, b, int, len);
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#else /* __alpha__ */
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#define klogctl syslog
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#endif
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#else
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# include <sys/klog.h>
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#endif
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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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/* Path to the unix socket */
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char lfile[BUFSIZ] = "";
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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"
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#ifndef BB_FEATURE_TRIVIAL_HELP
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"\nLinux 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 NUM\t\tInterval between MARK lines (default=20min, 0=off)\n"
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"\t-n\t\tRun as a foreground process\n"
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#ifdef BB_FEATURE_KLOGD
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"\t-K\t\tDo not start up the klogd process\n"
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#endif
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"\t-O FILE\t\tUse an alternate log file (default=/var/log/messages)\n"
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#endif
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;
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/* Note: There is also a function called "message()" in init.c */
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/* Print a message to the log file. */
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static void message (char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
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static void message (char *fmt, ...)
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{
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int fd;
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struct flock fl;
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va_list arguments;
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fl.l_whence = SEEK_SET;
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fl.l_start = 0;
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fl.l_len = 1;
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if ((fd = device_open (logFilePath,
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O_WRONLY | O_CREAT | O_NOCTTY | O_APPEND |
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O_NONBLOCK)) >= 0) {
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fl.l_type = F_WRLCK;
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fcntl (fd, F_SETLKW, &fl);
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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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fl.l_type = F_UNLCK;
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fcntl (fd, F_SETLKW, &fl);
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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,
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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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if (pri != 0) {
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for (c_fac = facilitynames;
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c_fac->c_name && !(c_fac->c_val == LOG_FAC(pri) << 3); c_fac++);
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for (c_pri = prioritynames;
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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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}
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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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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(0, "System log daemon exiting.");
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unlink(lfile);
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exit(TRUE);
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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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#define BUFSIZE 1023
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static int serveConnection (int conn)
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{
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char buf[ BUFSIZE + 1 ];
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int n_read;
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while ((n_read = read (conn, buf, BUFSIZE )) > 0) {
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int pri = (LOG_USER | LOG_NOTICE);
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char line[ BUFSIZE + 1 ];
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unsigned char c;
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char *p = buf, *q = line;
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buf[ n_read - 1 ] = '\0';
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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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return (0);
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}
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static void doSyslogd (void) __attribute__ ((noreturn));
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static void doSyslogd (void)
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{
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struct sockaddr_un sunx;
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socklen_t addrLength;
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int sock_fd;
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fd_set fds;
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char lfile[BUFSIZ];
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/* Set up signal 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, SIG_IGN);
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signal (SIGCLD, SIG_IGN);
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signal (SIGALRM, domark);
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alarm (MarkInterval);
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/* Create the syslog file so realpath() can work. */
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close (open (_PATH_LOG, O_RDWR | O_CREAT, 0644));
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if (realpath (_PATH_LOG, lfile) == NULL)
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fatalError ("Could not resolv path to " _PATH_LOG ": %s\n", strerror (errno));
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unlink (lfile);
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memset (&sunx, 0, sizeof (sunx));
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sunx.sun_family = AF_UNIX;
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strncpy (sunx.sun_path, lfile, sizeof (sunx.sun_path));
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if ((sock_fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
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fatalError ("Couldn't obtain descriptor for socket " _PATH_LOG ": %s\n", strerror (errno));
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addrLength = sizeof (sunx.sun_family) + strlen (sunx.sun_path);
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if ((bind (sock_fd, (struct sockaddr *) &sunx, addrLength)) || (listen (sock_fd, 5)))
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fatalError ("Could not connect to socket " _PATH_LOG ": %s\n", strerror (errno));
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if (chmod (lfile, 0666) < 0)
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fatalError ("Could not set permission on " _PATH_LOG ": %s\n", strerror (errno));
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FD_ZERO (&fds);
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FD_SET (sock_fd, &fds);
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logMessage (0, "syslogd started: BusyBox v" BB_VER " (" BB_BT ")");
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for (;;) {
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fd_set readfds;
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int n_ready;
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int fd;
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memcpy (&readfds, &fds, sizeof (fds));
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if ((n_ready = select (FD_SETSIZE, &readfds, NULL, NULL, NULL)) < 0) {
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if (errno == EINTR) continue; /* alarm may have happened. */
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fatalError ("select error: %s\n", strerror (errno));
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}
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for (fd = 0; (n_ready > 0) && (fd < FD_SETSIZE); fd++) {
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if (FD_ISSET (fd, &readfds)) {
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--n_ready;
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if (fd == sock_fd) {
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int conn;
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pid_t pid;
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if ((conn = accept (sock_fd, (struct sockaddr *) &sunx, &addrLength)) < 0) {
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fatalError ("accept error: %s\n", strerror (errno));
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}
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pid = fork();
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if (pid < 0) {
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perror ("syslogd: fork");
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close (conn);
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continue;
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}
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if (pid == 0)
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serveConnection (conn);
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close (conn);
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}
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}
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}
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}
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}
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#ifdef BB_FEATURE_KLOGD
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static void klogd_signal(int sig)
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{
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klogctl(7, NULL, 0);
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klogctl(0, 0, 0);
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logMessage(0, "Kernel log daemon exiting.");
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exit(TRUE);
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}
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static void doKlogd (void) __attribute__ ((noreturn));
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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, SIG_IGN);
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logMessage(0, "klogd started: "
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"BusyBox v" BB_VER " (" BB_BT ")");
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klogctl(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 (klogctl(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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switch (*(log_buffer + 1)) {
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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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static void daemon_init (char **argv, char *dz, void fn (void))
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{
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setsid();
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chdir ("/");
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strncpy(argv[0], dz, strlen(argv[0]));
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fn();
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exit(0);
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}
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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_FEATURE_KLOGD
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int startKlogd = TRUE;
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#endif
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int stopDoingThat = FALSE;
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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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stopDoingThat = FALSE;
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while (stopDoingThat == FALSE && *(++(*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_FEATURE_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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stopDoingThat = TRUE;
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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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if (argc > 0)
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usage(syslogd_usage);
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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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umask(0);
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#ifdef BB_FEATURE_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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daemon_init (argv, "klogd", doKlogd);
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}
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}
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#endif
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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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daemon_init (argv, "syslogd", doSyslogd);
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}
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} else {
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doSyslogd();
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}
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return(TRUE);
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}
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/*
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Local Variables
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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