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-rw-r--r--sysklogd/syslogd.c238
1 files changed, 152 insertions, 86 deletions
diff --git a/sysklogd/syslogd.c b/sysklogd/syslogd.c
index 4bc1d3d..464d784 100644
--- a/sysklogd/syslogd.c
+++ b/sysklogd/syslogd.c
@@ -22,21 +22,21 @@
*/
#include "internal.h"
-#include <stdio.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 <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>
-#include <sys/klog.h>
-#include <errno.h>
-#include <paths.h>
+#include <unistd.h>
#define ksyslog klogctl
extern int ksyslog(int type, char *buf, int len);
@@ -47,8 +47,10 @@ extern int ksyslog(int type, char *buf, int len);
#include <sys/syslog.h>
/* Path for the file where all log messages are written */
-#define __LOG_FILE "/var/log/messages"
+#define __LOG_FILE "/var/log/messages"
+/* Path to the unix socket */
+char lfile[PATH_MAX] = "";
static char *logFilePath = __LOG_FILE;
@@ -70,9 +72,8 @@ static const char syslogd_usage[] =
#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 */
+/* Print a message to the log file. */
static void message(char *fmt, ...)
{
int fd;
@@ -145,7 +146,7 @@ static void logMessage(int pri, char *msg)
static void quit_signal(int sig)
{
logMessage(0, "System log daemon exiting.");
- unlink(_PATH_LOG);
+ unlink(lfile);
exit(TRUE);
}
@@ -157,88 +158,134 @@ static void domark(int sig)
}
}
-static void doSyslogd(void)
+static void doSyslogd (void) __attribute__ ((noreturn));
+static void doSyslogd (void)
{
struct sockaddr_un sunx;
- int fd, conn;
size_t addrLength;
- char buf[1024];
- char *q, *p = buf;
- int readSize;
+ 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(SIGALRM, domark);
- signal(SIGHUP, SIG_IGN);
- alarm(MarkInterval);
-
- /* Remove any preexisting socket/file */
- unlink(_PATH_LOG);
-
- 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(AF_UNIX, SOCK_STREAM, 0)) < 0) {
- perror("Couldn't obtain descriptor for socket " _PATH_LOG);
- exit(FALSE);
+ 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));
+
+ 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);
}
- addrLength = sizeof(sunx.sun_family) + strlen(sunx.sun_path);
- if ((bind(fd, (struct sockaddr *) &sunx, addrLength)) ||
- (listen(fd, 5))) {
- perror("Could not connect to socket " _PATH_LOG);
- exit(FALSE);
+ 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);
}
- umask(0);
- if (chmod(_PATH_LOG, 0666) < 0) {
- perror("Could not set permission on " _PATH_LOG);
- exit(FALSE);
+ if (chmod (lfile, 0666) < 0) {
+ perror ("Could not set permission on " _PATH_LOG);
+ exit (FALSE);
}
- logMessage(0, "syslogd started: BusyBox v" BB_VER " (" BB_BT ")");
-
-
- 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');
+ FD_ZERO (&readfds);
+ FD_SET (sock_fd, &readfds);
+
+ logMessage (0, "syslogd started: BusyBox v" BB_VER " (" BB_BT ")");
+
+ for (;;) {
+ int n_ready;
+ int fd;
+
+ if ((n_ready = select (FD_SETSIZE, &readfds, NULL, NULL, NULL)) < 0) {
+ if (errno == EINTR) continue; /* alarm may have happened. */
+ perror ("select");
+ exit (FALSE);
+ }
+
+ /* 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); /* #### ??? */
}
- 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;
+ FD_SET (conn, &readfds);
}
- p++;
- }
- *q = '\0';
+ else {
+#define BUFSIZE 1024 + 1
+ char buf[BUFSIZE];
+ char *q, *p;
+ int n_read;
- /* Now log it */
- logMessage(pri, line);
+ 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);
+
+ 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;
+ }
+ }
+ }
}
- close(conn);
}
-
- close(fd);
}
#ifdef BB_KLOGD
@@ -251,7 +298,8 @@ static void klogd_signal(int sig)
exit(TRUE);
}
-static void doKlogd(void)
+static void doKlogd (void) __attribute__ ((noreturn));
+static void doKlogd (void)
{
int priority = LOG_INFO;
char log_buffer[4096];
@@ -317,6 +365,16 @@ static void doKlogd(void)
#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;
@@ -366,13 +424,14 @@ extern int syslogd_main(int argc, char **argv)
*p++ = '\0';
}
+ umask(0);
+
#ifdef BB_KLOGD
/* Start up the klogd process */
if (startKlogd == TRUE) {
klogd_pid = fork();
if (klogd_pid == 0) {
- strncpy(argv[0], "klogd", strlen(argv[0]));
- doKlogd();
+ daemon_init (argv, "klogd", doKlogd);
}
}
#endif
@@ -382,8 +441,7 @@ extern int syslogd_main(int argc, char **argv)
if (pid < 0)
exit(pid);
else if (pid == 0) {
- strncpy(argv[0], "syslogd", strlen(argv[0]));
- doSyslogd();
+ daemon_init (argv, "syslogd", doSyslogd);
}
} else {
doSyslogd();
@@ -391,3 +449,11 @@ extern int syslogd_main(int argc, char **argv)
exit(TRUE);
}
+
+/*
+ * Local Variables
+ * c-file-style: "linux"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * End:
+ */
generated by cgit v1.1 at 2024-12-26 03:23:01 +0000