-/* userver.c - simple server for Unix domain sockets */
-
-/* Waits for a connection on the ./sample-socket Unix domain
- socket. Once a connection has been established, copy data
- from the socket to stdout until the other end closes the
- connection, and then wait for another connection to the socket. */
+/* vi: set sw=4 ts=4: */
+/*
+ * 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 <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 _PATH_LOG "/dev/log"
+#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;
-/* issue an error message via perror() and terminate the program */
-void die(char * message) {
- perror(message);
- exit(1);
+/* 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, ...)
+{
+ 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(_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);
+ }
+ }
}
-/* Copies data from file descriptor 'from' to file descriptor 'to'
- until nothing is left to be copied. Exits if an error occurs. */
-void copyData(int from, int to) {
- char buf[1024];
- int amount;
-
- while ((amount = read(from, buf, sizeof(buf))) > 0) {
- if (write(to, buf, amount) != amount) {
- die("write");
- return;
- }
- }
- if (amount < 0)
- die("read");
+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 readfds;
+ char lfile[PATH_MAX];
+ int t = readlink(_PATH_LOG, lfile, sizeof(lfile) - 1); /* Resolve symlinks */
+
+ /* Set up sig handlers */
+ signal (SIGINT, quit_signal);
+ signal (SIGTERM, quit_signal);
+ signal (SIGQUIT, quit_signal);
+ signal (SIGHUP, SIG_IGN);
+ signal (SIGALRM, domark);
+ alarm (MarkInterval);
+
+ if (t == -1)
+ strncpy(lfile, _PATH_LOG, sizeof(lfile));
+ else
+ lfile[t] = '\0';
+
+ unlink (lfile);
+
+ memset (&sunx, 0, sizeof(sunx));
-int main(void) {
- struct sockaddr_un address;
- int fd, conn;
- size_t addrLength;
+ sunx.sun_family = AF_UNIX;
+ strncpy (sunx.sun_path, lfile, sizeof(sunx.sun_path));
+ if ((sock_fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
+ perror ("Couldn't obtain descriptor for socket " _PATH_LOG);
+ exit (FALSE);
+ }
- /* Remove any preexisting socket (or other file) */
- unlink(_PATH_LOG);
+ addrLength = sizeof (sunx.sun_family) + strlen (sunx.sun_path);
+ if ((bind (sock_fd, (struct sockaddr *) &sunx, addrLength)) ||
+ (listen (sock_fd, 5))) {
+ perror ("Could not connect to socket " _PATH_LOG);
+ exit (FALSE);
+ }
- memset(&address, 0, sizeof(address));
- address.sun_family = AF_UNIX; /* Unix domain socket */
- strncpy(address.sun_path, _PATH_LOG, sizeof(address.sun_path));
+ if (chmod (lfile, 0666) < 0) {
+ perror ("Could not set permission on " _PATH_LOG);
+ exit (FALSE);
+ }
- if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
- die("socket");
+ FD_ZERO (&readfds);
+ FD_SET (sock_fd, &readfds);
+ logMessage (0, "syslogd started: BusyBox v" BB_VER " (" BB_BT ")");
- /* The total length of the address includes the sun_family
- element */
- addrLength = sizeof(address.sun_family) +
- strlen(address.sun_path);
+ for (;;) {
+ int n_ready;
+ int fd;
- if (bind(fd, (struct sockaddr *) &address, addrLength))
- die("bind");
+ if ((n_ready = select (FD_SETSIZE, &readfds, NULL, NULL, NULL)) < 0) {
+ if (errno == EINTR) continue; /* alarm may have happened. */
+ perror ("select");
+ exit (FALSE);
+ }
- if (chmod(_PATH_LOG, 0666) < 0)
- die("chmod");
+ /* Skip stdin, stdout, stderr */
+ for (fd = 3; fd <= FD_SETSIZE; fd++) {
+ if (FD_ISSET (fd, &readfds)) {
+ if (fd == sock_fd) {
+ int conn;
+ if ((conn = accept(sock_fd, (struct sockaddr *) &sunx,
+ &addrLength)) < 0) {
+ perror ("accept");
+ exit (FALSE); /* #### ??? */
+ }
+ FD_SET (conn, &readfds);
+ }
+ else {
+#define BUFSIZE 1024 + 1
+ char buf[BUFSIZE];
+ char *q, *p;
+ int n_read;
- if (listen(fd, 5))
- die("listen");
+ n_read = read (fd, buf, BUFSIZE);
+ if (n_read < 0) {
+ perror ("read error");
+ goto close_fd;
+ }
+ else if (n_read > 0) {
+ char line[BUFSIZE];
+ unsigned char c;
+ int pri = (LOG_USER | LOG_NOTICE);
- while ((conn = accept(fd, (struct sockaddr *) &address,
- &addrLength)) >= 0) {
- printf("---- getting data\n");
- copyData(conn, fileno(stdout));
- printf("---- done\n");
- close(conn);
- }
+ 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_fd:
+ close (fd);
+ FD_CLR (fd, &readfds);
+ }
+ else { /* EOF */
+ goto close_fd;
+ }
+ }
+ }
+ }
+ }
+}
+
+#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);
+ }
- if (conn < 0)
- die("accept");
-
- close(fd);
- return 0;
}
+#endif
+static void daemon_init (char **argv, char *dz, void fn (void)) __attribute__ ((noreturn));
+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:
+ */
projects / oweals / busybox.git / blobdiff