* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
+/*
+ * Done in syslogd_and_logger.c:
#include "libbb.h"
#define SYSLOG_NAMES
#define SYSLOG_NAMES_CONST
#include <syslog.h>
+*/
-#include <paths.h>
#include <sys/un.h>
#include <sys/uio.h>
* (semaphores are down but do_mark routine tries to down them again) */
#undef SYSLOGD_MARK
+/* Write locking does not seem to be useful either */
+#undef SYSLOGD_WRLOCK
+
enum {
- MAX_READ = 256,
+ MAX_READ = CONFIG_FEATURE_SYSLOGD_READ_BUFFER_SIZE,
DNS_WAIT_SEC = 2 * 60,
};
char data[1]; /* data/messages */
};
+#if ENABLE_FEATURE_REMOTE_LOG
+typedef struct {
+ int remoteFD;
+ unsigned last_dns_resolve;
+ len_and_sockaddr *remoteAddr;
+ const char *remoteHostname;
+} remoteHost_t;
+#endif
+
/* Allows us to have smaller initializer. Ugly. */
#define GLOBALS \
const char *logFilePath; \
/*int markInterval;*/ \
/* level of messages to be logged */ \
int logLevel; \
-USE_FEATURE_ROTATE_LOGFILE( \
+IF_FEATURE_ROTATE_LOGFILE( \
/* max size of file before rotation */ \
unsigned logFileSize; \
/* number of rotated message files */ \
unsigned curFileSize; \
smallint isRegular; \
) \
-USE_FEATURE_REMOTE_LOG( \
- /* udp socket for remote logging */ \
- int remoteFD; \
- len_and_sockaddr* remoteAddr; \
-) \
-USE_FEATURE_IPC_SYSLOG( \
+IF_FEATURE_IPC_SYSLOG( \
int shmid; /* ipc shared memory id */ \
int s_semid; /* ipc semaphore id */ \
int shm_size; \
GLOBALS
#if ENABLE_FEATURE_REMOTE_LOG
- unsigned last_dns_resolve;
- char *remoteAddrStr;
+ llist_t *remoteHosts;
#endif
-
#if ENABLE_FEATURE_IPC_SYSLOG
struct shbuf_ds *shbuf;
#endif
time_t last_log_time;
- /* localhost's name */
- char localHostName[64];
+ /* localhost's name. We print only first 64 chars */
+ char *hostname;
/* We recv into recvbuf... */
- char recvbuf[MAX_READ];
+ char recvbuf[MAX_READ * (1 + ENABLE_FEATURE_SYSLOGD_DUP)];
/* ...then copy to parsebuf, escaping control chars */
/* (can grow x2 max) */
char parsebuf[MAX_READ*2];
.logFileSize = 200 * 1024,
.logFileRotate = 1,
#endif
-#if ENABLE_FEATURE_REMOTE_LOG
- .remoteFD = -1,
-#endif
#if ENABLE_FEATURE_IPC_SYSLOG
.shmid = -1,
.s_semid = -1,
#define G (*ptr_to_globals)
#define INIT_G() do { \
- PTR_TO_GLOBALS = memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data)); \
+ SET_PTR_TO_GLOBALS(memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data))); \
} while (0)
OPTBIT_outfile, // -O
OPTBIT_loglevel, // -l
OPTBIT_small, // -S
- USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s
- USE_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b
- USE_FEATURE_REMOTE_LOG( OPTBIT_remote ,) // -R
- USE_FEATURE_REMOTE_LOG( OPTBIT_locallog ,) // -L
- USE_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C
+ IF_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s
+ IF_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b
+ IF_FEATURE_REMOTE_LOG( OPTBIT_remotelog ,) // -R
+ IF_FEATURE_REMOTE_LOG( OPTBIT_locallog ,) // -L
+ IF_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C
+ IF_FEATURE_SYSLOGD_DUP( OPTBIT_dup ,) // -D
OPT_mark = 1 << OPTBIT_mark ,
OPT_nofork = 1 << OPTBIT_nofork ,
OPT_outfile = 1 << OPTBIT_outfile ,
OPT_loglevel = 1 << OPTBIT_loglevel,
OPT_small = 1 << OPTBIT_small ,
- OPT_filesize = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0,
- OPT_rotatecnt = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 0,
- OPT_remotelog = USE_FEATURE_REMOTE_LOG( (1 << OPTBIT_remote )) + 0,
- OPT_locallog = USE_FEATURE_REMOTE_LOG( (1 << OPTBIT_locallog )) + 0,
- OPT_circularlog = USE_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0,
+ OPT_filesize = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0,
+ OPT_rotatecnt = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 0,
+ OPT_remotelog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_remotelog )) + 0,
+ OPT_locallog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_locallog )) + 0,
+ OPT_circularlog = IF_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0,
+ OPT_dup = IF_FEATURE_SYSLOGD_DUP( (1 << OPTBIT_dup )) + 0,
};
#define OPTION_STR "m:nO:l:S" \
- USE_FEATURE_ROTATE_LOGFILE("s:" ) \
- USE_FEATURE_ROTATE_LOGFILE("b:" ) \
- USE_FEATURE_REMOTE_LOG( "R:" ) \
- USE_FEATURE_REMOTE_LOG( "L" ) \
- USE_FEATURE_IPC_SYSLOG( "C::")
+ IF_FEATURE_ROTATE_LOGFILE("s:" ) \
+ IF_FEATURE_ROTATE_LOGFILE("b:" ) \
+ IF_FEATURE_REMOTE_LOG( "R:" ) \
+ IF_FEATURE_REMOTE_LOG( "L" ) \
+ IF_FEATURE_IPC_SYSLOG( "C::") \
+ IF_FEATURE_SYSLOGD_DUP( "D" )
#define OPTION_DECL *opt_m, *opt_l \
- USE_FEATURE_ROTATE_LOGFILE(,*opt_s) \
- USE_FEATURE_ROTATE_LOGFILE(,*opt_b) \
- USE_FEATURE_IPC_SYSLOG( ,*opt_C = NULL)
+ IF_FEATURE_ROTATE_LOGFILE(,*opt_s) \
+ IF_FEATURE_ROTATE_LOGFILE(,*opt_b) \
+ IF_FEATURE_IPC_SYSLOG( ,*opt_C = NULL)
#define OPTION_PARAM &opt_m, &G.logFilePath, &opt_l \
- USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \
- USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \
- USE_FEATURE_REMOTE_LOG( ,&G.remoteAddrStr) \
- USE_FEATURE_IPC_SYSLOG( ,&opt_C)
+ IF_FEATURE_ROTATE_LOGFILE(,&opt_s) \
+ IF_FEATURE_ROTATE_LOGFILE(,&opt_b) \
+ IF_FEATURE_REMOTE_LOG( ,&remoteAddrList) \
+ IF_FEATURE_IPC_SYSLOG( ,&opt_C)
/* circular buffer variables/structures */
#error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
#endif
-/* our shared key */
-#define KEY_ID ((long)0x414e4547) /* "GENA" */
+/* our shared key (syslogd.c and logread.c must be in sync) */
+enum { KEY_ID = 0x414e4547 }; /* "GENA" */
static void ipcsyslog_cleanup(void)
{
static void ipcsyslog_init(void)
{
if (DEBUG)
- printf("shmget(%lx, %d,...)\n", KEY_ID, G.shm_size);
+ printf("shmget(%x, %d,...)\n", (int)KEY_ID, G.shm_size);
G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644);
if (G.shmid == -1) {
/* Print a message to the log file. */
static void log_locally(time_t now, char *msg)
{
+#ifdef SYSLOGD_WRLOCK
struct flock fl;
+#endif
int len = strlen(msg);
#if ENABLE_FEATURE_IPC_SYSLOG
}
#endif
if (G.logFD >= 0) {
+ /* Reopen log file every second. This allows admin
+ * to delete the file and not worry about restarting us.
+ * This costs almost nothing since it happens
+ * _at most_ once a second.
+ */
if (!now)
now = time(NULL);
if (G.last_log_time != now) {
- G.last_log_time = now; /* reopen log file every second */
+ G.last_log_time = now;
close(G.logFD);
goto reopen;
}
} else {
reopen:
- G.logFD = device_open(G.logFilePath, O_WRONLY | O_CREAT
- | O_NOCTTY | O_APPEND | O_NONBLOCK);
+ G.logFD = open(G.logFilePath, O_WRONLY | O_CREAT
+ | O_NOCTTY | O_APPEND | O_NONBLOCK,
+ 0666);
if (G.logFD < 0) {
/* cannot open logfile? - print to /dev/console then */
int fd = device_open(DEV_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
#endif
}
+#ifdef SYSLOGD_WRLOCK
fl.l_whence = SEEK_SET;
fl.l_start = 0;
fl.l_len = 1;
fl.l_type = F_WRLCK;
fcntl(G.logFD, F_SETLKW, &fl);
+#endif
#if ENABLE_FEATURE_ROTATE_LOGFILE
if (G.logFileSize && G.isRegular && G.curFileSize > G.logFileSize) {
sprintf(newFile, "%s.%d", G.logFilePath, i);
if (i == 0) break;
sprintf(oldFile, "%s.%d", G.logFilePath, --i);
+ /* ignore errors - file might be missing */
rename(oldFile, newFile);
}
/* newFile == "f.0" now */
rename(G.logFilePath, newFile);
+#ifdef SYSLOGD_WRLOCK
fl.l_type = F_UNLCK;
fcntl(G.logFD, F_SETLKW, &fl);
+#endif
close(G.logFD);
goto reopen;
}
}
G.curFileSize +=
#endif
- full_write(G.logFD, msg, len);
+ full_write(G.logFD, msg, len);
+#ifdef SYSLOGD_WRLOCK
fl.l_type = F_UNLCK;
fcntl(G.logFD, F_SETLKW, &fl);
+#endif
}
static void parse_fac_prio_20(int pri, char *res20)
char *timestamp;
time_t now;
+ /* Jan 18 00:11:22 msg... */
+ /* 01234567890123456 */
if (len < 16 || msg[3] != ' ' || msg[6] != ' '
|| msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
) {
else {
char res[20];
parse_fac_prio_20(pri, res);
- sprintf(G.printbuf, "%s %s %s %s\n", timestamp, G.localHostName, res, msg);
+ sprintf(G.printbuf, "%s %.64s %s %s\n", timestamp, G.hostname, res, msg);
}
/* Log message locally (to file or shared mem) */
static void timestamp_and_log_internal(const char *msg)
{
+ /* -L, or no -R */
if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog))
return;
timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)msg, 0);
}
}
-static void quit_signal(int sig)
-{
- timestamp_and_log_internal("syslogd exiting");
- puts("syslogd exiting");
- if (ENABLE_FEATURE_IPC_SYSLOG)
- ipcsyslog_cleanup();
- exit(1);
-}
-
#ifdef SYSLOGD_MARK
static void do_mark(int sig)
{
}
#if ENABLE_FEATURE_REMOTE_LOG
-static int try_to_resolve_remote(void)
+static int try_to_resolve_remote(remoteHost_t *rh)
{
- if (!G.remoteAddr) {
+ if (!rh->remoteAddr) {
unsigned now = monotonic_sec();
/* Don't resolve name too often - DNS timeouts can be big */
- if ((now - G.last_dns_resolve) < DNS_WAIT_SEC)
+ if ((now - rh->last_dns_resolve) < DNS_WAIT_SEC)
return -1;
- G.last_dns_resolve = now;
- G.remoteAddr = host2sockaddr(G.remoteAddrStr, 514);
- if (!G.remoteAddr)
+ rh->last_dns_resolve = now;
+ rh->remoteAddr = host2sockaddr(rh->remoteHostname, 514);
+ if (!rh->remoteAddr)
return -1;
}
- return socket(G.remoteAddr->u.sa.sa_family, SOCK_DGRAM, 0);
+ return xsocket(rh->remoteAddr->u.sa.sa_family, SOCK_DGRAM, 0);
}
#endif
-static void do_syslogd(void) ATTRIBUTE_NORETURN;
+static void do_syslogd(void) NORETURN;
static void do_syslogd(void)
{
int sock_fd;
+#if ENABLE_FEATURE_REMOTE_LOG
+ llist_t *item;
+#endif
+#if ENABLE_FEATURE_SYSLOGD_DUP
+ int last_sz = -1;
+ char *last_buf;
+ char *recvbuf = G.recvbuf;
+#else
+#define recvbuf (G.recvbuf)
+#endif
- /* Set up signal handlers */
- signal(SIGINT, quit_signal);
- signal(SIGTERM, quit_signal);
- signal(SIGQUIT, quit_signal);
+ /* Set up signal handlers (so that they interrupt read()) */
+ signal_no_SA_RESTART_empty_mask(SIGTERM, record_signo);
+ signal_no_SA_RESTART_empty_mask(SIGINT, record_signo);
+ //signal_no_SA_RESTART_empty_mask(SIGQUIT, record_signo);
signal(SIGHUP, SIG_IGN);
- /* signal(SIGCHLD, SIG_IGN); - why? */
#ifdef SYSLOGD_MARK
signal(SIGALRM, do_mark);
alarm(G.markInterval);
timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER);
- for (;;) {
- size_t sz;
+ while (!bb_got_signal) {
+ ssize_t sz;
+
+#if ENABLE_FEATURE_SYSLOGD_DUP
+ last_buf = recvbuf;
+ if (recvbuf == G.recvbuf)
+ recvbuf = G.recvbuf + MAX_READ;
+ else
+ recvbuf = G.recvbuf;
+#endif
read_again:
- sz = safe_read(sock_fd, G.recvbuf, MAX_READ - 1);
- if (sz < 0)
- bb_perror_msg_and_die("read from /dev/log");
+ sz = read(sock_fd, recvbuf, MAX_READ - 1);
+ if (sz < 0) {
+ if (!bb_got_signal)
+ bb_perror_msg("read from /dev/log");
+ break;
+ }
/* Drop trailing '\n' and NULs (typically there is one NUL) */
while (1) {
* IOW: newline is passed verbatim!
* I take it to mean that it's syslogd's job
* to make those look identical in the log files. */
- if (G.recvbuf[sz-1] != '\0' && G.recvbuf[sz-1] != '\n')
+ if (recvbuf[sz-1] != '\0' && recvbuf[sz-1] != '\n')
break;
sz--;
}
- /* TODO: maybe suppress duplicates? */
+#if ENABLE_FEATURE_SYSLOGD_DUP
+ if ((option_mask32 & OPT_dup) && (sz == last_sz))
+ if (memcmp(last_buf, recvbuf, sz) == 0)
+ continue;
+ last_sz = sz;
+#endif
#if ENABLE_FEATURE_REMOTE_LOG
+ /* Stock syslogd sends it '\n'-terminated
+ * over network, mimic that */
+ recvbuf[sz] = '\n';
+
/* We are not modifying log messages in any way before send */
/* Remote site cannot trust _us_ anyway and need to do validation again */
- if (G.remoteAddrStr) {
- if (-1 == G.remoteFD) {
- G.remoteFD = try_to_resolve_remote();
- if (-1 == G.remoteFD)
- goto no_luck;
+ for (item = G.remoteHosts; item != NULL; item = item->link) {
+ remoteHost_t *rh = (remoteHost_t *)item->data;
+
+ if (rh->remoteFD == -1) {
+ rh->remoteFD = try_to_resolve_remote(rh);
+ if (rh->remoteFD == -1)
+ continue;
+ }
+
+ /* Send message to remote logger.
+ * On some errors, close and set remoteFD to -1
+ * so that DNS resolution is retried.
+ */
+ if (sendto(rh->remoteFD, recvbuf, sz+1,
+ MSG_DONTWAIT | MSG_NOSIGNAL,
+ &(rh->remoteAddr->u.sa), rh->remoteAddr->len) == -1
+ ) {
+ switch (errno) {
+ case ECONNRESET:
+ case ENOTCONN: /* paranoia */
+ case EPIPE:
+ close(rh->remoteFD);
+ rh->remoteFD = -1;
+ free(rh->remoteAddr);
+ rh->remoteAddr = NULL;
+ }
}
- /* Stock syslogd sends it '\n'-terminated
- * over network, mimic that */
- G.recvbuf[sz] = '\n';
- /* send message to remote logger, ignore possible error */
- /* TODO: on some errors, close and set G.remoteFD to -1
- * so that DNS resolution and connect is retried? */
- sendto(G.remoteFD, G.recvbuf, sz+1, MSG_DONTWAIT,
- &G.remoteAddr->u.sa, G.remoteAddr->len);
- no_luck: ;
}
#endif
if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
- G.recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */
- split_escape_and_log(G.recvbuf, sz);
+ recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */
+ split_escape_and_log(recvbuf, sz);
}
- } /* for (;;) */
+ } /* while (!bb_got_signal) */
+
+ timestamp_and_log_internal("syslogd exiting");
+ puts("syslogd exiting");
+ if (ENABLE_FEATURE_IPC_SYSLOG)
+ ipcsyslog_cleanup();
+ kill_myself_with_sig(bb_got_signal);
+#undef recvbuf
}
int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int syslogd_main(int argc, char **argv)
+int syslogd_main(int argc UNUSED_PARAM, char **argv)
{
+ int opts;
char OPTION_DECL;
- char *p;
+#if ENABLE_FEATURE_REMOTE_LOG
+ llist_t *remoteAddrList = NULL;
+#endif
INIT_G();
+
+ /* No non-option params, -R can occur multiple times */
+ opt_complementary = "=0" IF_FEATURE_REMOTE_LOG(":R::");
+ opts = getopt32(argv, OPTION_STR, OPTION_PARAM);
#if ENABLE_FEATURE_REMOTE_LOG
- G.last_dns_resolve = monotonic_sec() - DNS_WAIT_SEC - 1;
+ while (remoteAddrList) {
+ remoteHost_t *rh = xzalloc(sizeof(*rh));
+ rh->remoteHostname = llist_pop(&remoteAddrList);
+ rh->remoteFD = -1;
+ rh->last_dns_resolve = monotonic_sec() - DNS_WAIT_SEC - 1;
+ llist_add_to(&G.remoteHosts, rh);
+ }
#endif
- /* do normal option parsing */
- opt_complementary = "=0"; /* no non-option params */
- getopt32(argv, OPTION_STR, OPTION_PARAM);
#ifdef SYSLOGD_MARK
- if (option_mask32 & OPT_mark) // -m
+ if (opts & OPT_mark) // -m
G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
#endif
- //if (option_mask32 & OPT_nofork) // -n
- //if (option_mask32 & OPT_outfile) // -O
- if (option_mask32 & OPT_loglevel) // -l
+ //if (opts & OPT_nofork) // -n
+ //if (opts & OPT_outfile) // -O
+ if (opts & OPT_loglevel) // -l
G.logLevel = xatou_range(opt_l, 1, 8);
- //if (option_mask32 & OPT_small) // -S
+ //if (opts & OPT_small) // -S
#if ENABLE_FEATURE_ROTATE_LOGFILE
- if (option_mask32 & OPT_filesize) // -s
+ if (opts & OPT_filesize) // -s
G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
- if (option_mask32 & OPT_rotatecnt) // -b
+ if (opts & OPT_rotatecnt) // -b
G.logFileRotate = xatou_range(opt_b, 0, 99);
#endif
#if ENABLE_FEATURE_IPC_SYSLOG
#endif
/* If they have not specified remote logging, then log locally */
- if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_remotelog))
+ if (ENABLE_FEATURE_REMOTE_LOG && !(opts & OPT_remotelog)) // -R
option_mask32 |= OPT_locallog;
/* Store away localhost's name before the fork */
- gethostname(G.localHostName, sizeof(G.localHostName));
- p = strchr(G.localHostName, '.');
- if (p) {
- *p = '\0';
- }
+ G.hostname = safe_gethostname();
+ *strchrnul(G.hostname, '.') = '\0';
- if (!(option_mask32 & OPT_nofork)) {
+ if (!(opts & OPT_nofork)) {
bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
}
- umask(0);
+ //umask(0); - why??
write_pidfile("/var/run/syslogd.pid");
do_syslogd();
/* return EXIT_SUCCESS; */
}
+
+/* Clean up. Needed because we are included from syslogd_and_logger.c */
+#undef DEBUG
+#undef SYSLOGD_MARK
+#undef SYSLOGD_WRLOCK
+#undef G
+#undef GLOBALS
+#undef INIT_G
+#undef OPTION_STR
+#undef OPTION_DECL
+#undef OPTION_PARAM
projects / oweals / busybox.git / blobdiff