| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini syslogd implementation for busybox |
| * |
| * 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 |
| * (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 <ctype.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <netdb.h> |
| #include <paths.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <sys/klog.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <sys/un.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| #define ksyslog klogctl |
| extern int ksyslog(int type, char *buf, int len); |
| |
| |
| /* 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 unix socket */ |
| char lfile[PATH_MAX] = ""; |
| |
| 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 and kernel (provides klogd) logging utility.\n" |
| "Note that this version of syslogd/klogd ignores /etc/syslog.conf.\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" |
| #ifdef BB_KLOGD |
| "\t-K\tDo not start up the klogd process (by default syslogd spawns klogd).\n" |
| #endif |
| "\t-O\tSpecify an alternate log file. default=/var/log/messages\n"; |
| |
| /* 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); |
| } |
| |
| static void quit_signal(int sig) |
| { |
| logMessage(0, "System log daemon exiting."); |
| unlink(lfile); |
| exit(TRUE); |
| } |
| |
| static void domark(int sig) |
| { |
| if (MarkInterval > 0) { |
| logMessage(LOG_SYSLOG | LOG_INFO, "-- MARK --"); |
| alarm(MarkInterval); |
| } |
| } |
| |
| static void doSyslogd (void) __attribute__ ((noreturn)); |
| static void doSyslogd (void) |
| { |
| struct sockaddr_un sunx; |
| size_t addrLength; |
| |
| int sock_fd; |
| fd_set fds; |
| |
| char lfile[PATH_MAX]; |
| |
| /* Set up signal handlers. */ |
| signal (SIGINT, quit_signal); |
| signal (SIGTERM, quit_signal); |
| signal (SIGQUIT, quit_signal); |
| signal (SIGHUP, SIG_IGN); |
| signal (SIGCLD, SIG_IGN); |
| 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 resolv path to " _PATH_LOG ": %s", 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", 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", strerror (errno)); |
| |
| if (chmod (lfile, 0666) < 0) |
| fatalError ("Could not set permission on " _PATH_LOG ": %s", strerror (errno)); |
| |
| FD_ZERO (&fds); |
| FD_SET (sock_fd, &fds); |
| |
| 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) { |
| |
| # define BUFSIZE 1023 |
| 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); |
| } |
| exit (0); |
| } |
| close (conn); |
| } |
| } |
| } |
| } |
| } |
| |
| #ifdef BB_KLOGD |
| |
| static void klogd_signal(int sig) |
| { |
| ksyslog(7, NULL, 0); |
| ksyslog(0, 0, 0); |
| logMessage(0, "Kernel log daemon exiting."); |
| exit(TRUE); |
| } |
| |
| static void doKlogd (void) __attribute__ ((noreturn)); |
| static void doKlogd (void) |
| { |
| 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); |
| logMessage(0, "klogd started: " |
| "BusyBox v" BB_VER " (" BB_BT ")"); |
| |
| ksyslog(1, NULL, 0); |
| |
| while (1) { |
| /* Use kernel syscalls */ |
| memset(log_buffer, '\0', sizeof(log_buffer)); |
| if (ksyslog(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); |
| } |
| 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); |
| } |
| |
| } |
| |
| #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, klogd_pid; |
| int doFork = TRUE; |
| |
| #ifdef BB_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_KLOGD |
| case 'K': |
| startKlogd = FALSE; |
| break; |
| #endif |
| case 'O': |
| if (--argc == 0) { |
| usage(syslogd_usage); |
| } |
| logFilePath = *(++argv1); |
| stopDoingThat = TRUE; |
| break; |
| default: |
| 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_KLOGD |
| /* Start up the klogd process */ |
| if (startKlogd == TRUE) { |
| klogd_pid = fork(); |
| if (klogd_pid == 0) { |
| daemon_init (argv, "klogd", doKlogd); |
| } |
| } |
| #endif |
| |
| if (doFork == TRUE) { |
| pid = fork(); |
| if (pid < 0) |
| exit(pid); |
| else if (pid == 0) { |
| daemon_init (argv, "syslogd", doSyslogd); |
| } |
| } else { |
| doSyslogd(); |
| } |
| |
| exit(TRUE); |
| } |
| |
| /* |
| Local Variables |
| c-file-style: "linux" |
| c-basic-offset: 4 |
| tab-width: 4 |
| End: |
| */ |