| /* |
| * Mini syslogd implementation for busybox |
| * |
| * Copyright (C) 1999 by Lineo, inc. |
| * Written by Erik Andersen <andersen@lineo.com>, <andersee@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 |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include "internal.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 <ctype.h> |
| #include <netdb.h> |
| |
| |
| /* SYSLOG_NAMES defined to pull some extra junk from syslog.h */ |
| #define SYSLOG_NAMES |
| #include <sys/syslog.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" |
| |
| |
| static char* logFilePath = __LOG_FILE; |
| /* interval between marks in seconds */ |
| 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"; |
| |
| |
| |
| /* try to open up the specified device */ |
| static int device_open(char *device, int mode) |
| { |
| 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; |
| } |
| |
| /* print a message to the log file */ |
| static void message(char *fmt, ...) |
| { |
| 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); |
| } |
| } |
| } |
| |
| static void logMessage( int pri, char* msg) |
| { |
| 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); |
| } |
| |
| static void quit_signal(int sig) |
| { |
| logMessage(LOG_SYSLOG|LOG_INFO, "syslogd exiting"); |
| exit( TRUE); |
| } |
| |
| static void restart_signal(int sig) |
| { |
| /* pretend to restart */ |
| logMessage(LOG_SYSLOG|LOG_INFO, "syslogd restarting"); |
| } |
| |
| static void domark(int sig) |
| { |
| if (MarkInterval > 0) { |
| logMessage(LOG_SYSLOG|LOG_INFO, "-- MARK --"); |
| signal(SIGALRM, domark); |
| alarm(MarkInterval); |
| } |
| } |
| |
| static void doSyslogd(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; |
| } |
| p++; |
| } |
| *q = '\0'; |
| |
| /* Now log it */ |
| logMessage( pri, line); |
| } |
| close(conn); |
| } |
| |
| close(fd); |
| } |
| |
| |
| 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); |
| } |
| logFilePath = *(++argv); |
| break; |
| default: |
| usage(syslogd_usage); |
| } |
| } |
| } |
| |
| if (doFork == TRUE) { |
| pid = fork(); |
| if ( pid < 0 ) |
| exit( pid); |
| else if ( pid == 0 ) { |
| doSyslogd(); |
| } |
| } else { |
| doSyslogd(); |
| } |
| exit( TRUE); |
| } |
| |
| |