* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
-#include "busybox.h"
-#include <paths.h>
-#include <sys/un.h>
-
-/* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
+/*
+ * Done in syslogd_and_logger.c:
+#include "libbb.h"
#define SYSLOG_NAMES
-#include <sys/syslog.h>
+#define SYSLOG_NAMES_CONST
+#include <syslog.h>
+*/
+
+#include <sys/un.h>
#include <sys/uio.h>
-#define DEBUG 0
+#if ENABLE_FEATURE_REMOTE_LOG
+#include <netinet/in.h>
+#endif
-/* Path to the unix socket */
-static char *dev_log_name;
+#if ENABLE_FEATURE_IPC_SYSLOG
+#include <sys/ipc.h>
+#include <sys/sem.h>
+#include <sys/shm.h>
+#endif
-/* Path for the file where all log messages are written */
-static const char *logFilePath = "/var/log/messages";
-/* interval between marks in seconds */
-static int markInterval = 20 * 60;
+#define DEBUG 0
-/* level of messages to be locally logged */
-static int logLevel = 8;
+/* MARK code is not very useful, is bloat, and broken:
+ * can deadlock if alarmed to make MARK while writing to IPC buffer
+ * (semaphores are down but do_mark routine tries to down them again) */
+#undef SYSLOGD_MARK
-/* localhost's name */
-static char localHostName[64];
+/* Write locking does not seem to be useful either */
+#undef SYSLOGD_WRLOCK
-#if ENABLE_FEATURE_ROTATE_LOGFILE
-/* max size of message file before being rotated */
-static int logFileSize = 200 * 1024;
-/* number of rotated message files */
-static int logFileRotate = 1;
+enum {
+ MAX_READ = CONFIG_FEATURE_SYSLOGD_READ_BUFFER_SIZE,
+ DNS_WAIT_SEC = 2 * 60,
+};
+
+/* Semaphore operation structures */
+struct shbuf_ds {
+ int32_t size; /* size of data - 1 */
+ int32_t tail; /* end of message list */
+ 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 logFD; \
+ /* interval between marks in seconds */ \
+ /*int markInterval;*/ \
+ /* level of messages to be logged */ \
+ int logLevel; \
+IF_FEATURE_ROTATE_LOGFILE( \
+ /* max size of file before rotation */ \
+ unsigned logFileSize; \
+ /* number of rotated message files */ \
+ unsigned logFileRotate; \
+ unsigned curFileSize; \
+ smallint isRegular; \
+) \
+IF_FEATURE_IPC_SYSLOG( \
+ int shmid; /* ipc shared memory id */ \
+ int s_semid; /* ipc semaphore id */ \
+ int shm_size; \
+ struct sembuf SMwup[1]; \
+ struct sembuf SMwdn[3]; \
+)
+
+struct init_globals {
+ GLOBALS
+};
+
+struct globals {
+ GLOBALS
+
#if ENABLE_FEATURE_REMOTE_LOG
-#include <netinet/in.h>
-/* udp socket for logging to remote host */
-static int remoteFD = -1;
-static struct sockaddr_in remoteAddr;
+ llist_t *remoteHosts;
#endif
+#if ENABLE_FEATURE_IPC_SYSLOG
+ struct shbuf_ds *shbuf;
+#endif
+ time_t last_log_time;
+ /* localhost's name. We print only first 64 chars */
+ char *hostname;
+
+ /* We recv into recvbuf... */
+ 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];
+ /* ...then sprintf into printbuf, adding timestamp (15 chars),
+ * host (64), fac.prio (20) to the message */
+ /* (growth by: 15 + 64 + 20 + delims = ~110) */
+ char printbuf[MAX_READ*2 + 128];
+};
+static const struct init_globals init_data = {
+ .logFilePath = "/var/log/messages",
+ .logFD = -1,
+#ifdef SYSLOGD_MARK
+ .markInterval = 20 * 60,
+#endif
+ .logLevel = 8,
+#if ENABLE_FEATURE_ROTATE_LOGFILE
+ .logFileSize = 200 * 1024,
+ .logFileRotate = 1,
+#endif
+#if ENABLE_FEATURE_IPC_SYSLOG
+ .shmid = -1,
+ .s_semid = -1,
+ .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), // default shm size
+ .SMwup = { {1, -1, IPC_NOWAIT} },
+ .SMwdn = { {0, 0}, {1, 0}, {1, +1} },
+#endif
+};
-/* NB: we may need 2x this amount on stack... */
-enum { MAX_READ = 1024 };
+#define G (*ptr_to_globals)
+#define INIT_G() do { \
+ SET_PTR_TO_GLOBALS(memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data))); \
+} while (0)
-/* options */
-/* Correct regardless of combination of CONFIG_xxx */
+/* Options */
enum {
OPTBIT_mark = 0, // -m
OPTBIT_nofork, // -n
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_localtoo ,) // -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_localtoo )) + 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_REMOTE_LOG( ,*opt_R) \
- USE_FEATURE_IPC_SYSLOG( ,*opt_C = NULL)
-#define OPTION_PARAM &opt_m, &logFilePath, &opt_l \
- USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \
- USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \
- USE_FEATURE_REMOTE_LOG( ,&opt_R) \
- USE_FEATURE_IPC_SYSLOG( ,&opt_C)
+ 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 \
+ 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 */
#if ENABLE_FEATURE_IPC_SYSLOG
-
#if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
#error Sorry, you must set the syslogd buffer size to at least 4KB.
#error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
#endif
-#include <sys/ipc.h>
-#include <sys/sem.h>
-#include <sys/shm.h>
-
-/* our shared key */
-#define KEY_ID ((long)0x414e4547) /* "GENA" */
-
-// Semaphore operation structures
-static struct shbuf_ds {
- int32_t size; // size of data written
- int32_t head; // start of message list
- int32_t tail; // end of message list
- char data[1]; // data/messages
-} *shbuf; // shared memory pointer
-
-static int shmid = -1; // ipc shared memory id
-static int s_semid = -1; // ipc semaphore id
-static int shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024); // default shm size
+/* our shared key (syslogd.c and logread.c must be in sync) */
+enum { KEY_ID = 0x414e4547 }; /* "GENA" */
static void ipcsyslog_cleanup(void)
{
- if (shmid != -1) {
- shmdt(shbuf);
+ if (G.shmid != -1) {
+ shmdt(G.shbuf);
}
- if (shmid != -1) {
- shmctl(shmid, IPC_RMID, NULL);
+ if (G.shmid != -1) {
+ shmctl(G.shmid, IPC_RMID, NULL);
}
- if (s_semid != -1) {
- semctl(s_semid, 0, IPC_RMID, 0);
+ if (G.s_semid != -1) {
+ semctl(G.s_semid, 0, IPC_RMID, 0);
}
}
static void ipcsyslog_init(void)
{
if (DEBUG)
- printf("shmget(%lx, %d,...)\n", KEY_ID, shm_size);
+ printf("shmget(%x, %d,...)\n", (int)KEY_ID, G.shm_size);
- shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023);
- if (shmid == -1) {
+ G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644);
+ if (G.shmid == -1) {
bb_perror_msg_and_die("shmget");
}
- shbuf = shmat(shmid, NULL, 0);
- if (!shbuf) {
+ G.shbuf = shmat(G.shmid, NULL, 0);
+ if (G.shbuf == (void*) -1L) { /* shmat has bizarre error return */
bb_perror_msg_and_die("shmat");
}
- shbuf->size = shm_size - offsetof(struct shbuf_ds, data);
- shbuf->head = shbuf->tail = 0;
+ memset(G.shbuf, 0, G.shm_size);
+ G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data) - 1;
+ /*G.shbuf->tail = 0;*/
// we'll trust the OS to set initial semval to 0 (let's hope)
- s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
- if (s_semid == -1) {
+ G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
+ if (G.s_semid == -1) {
if (errno == EEXIST) {
- s_semid = semget(KEY_ID, 2, 0);
- if (s_semid != -1)
+ G.s_semid = semget(KEY_ID, 2, 0);
+ if (G.s_semid != -1)
return;
}
bb_perror_msg_and_die("semget");
}
}
-/* write message to buffer */
+/* Write message to shared mem buffer */
static void log_to_shmem(const char *msg, int len)
{
- static /*const*/ struct sembuf SMwup[1] = { {1, -1, IPC_NOWAIT} };
- static /*const*/ struct sembuf SMwdn[3] = { {0, 0}, {1, 0}, {1, +1} };
-
int old_tail, new_tail;
- char *c;
- if (semop(s_semid, SMwdn, 3) == -1) {
+ if (semop(G.s_semid, G.SMwdn, 3) == -1) {
bb_perror_msg_and_die("SMwdn");
}
/* Circular Buffer Algorithm:
* --------------------------
- * tail == position where to store next syslog message.
- * head == position of next message to retrieve ("print").
- * if head == tail, there is no "unprinted" messages left.
- * head is typically advanced by separate "reader" program,
- * but if there isn't one, we have to do it ourself.
- * messages are NUL-separated.
+ * tail == position where to store next syslog message.
+ * tail's max value is (shbuf->size - 1)
+ * Last byte of buffer is never used and remains NUL.
*/
len++; /* length with NUL included */
again:
- old_tail = shbuf->tail;
+ old_tail = G.shbuf->tail;
new_tail = old_tail + len;
- if (new_tail < shbuf->size) {
- /* No need to move head if shbuf->head <= old_tail,
- * else... */
- if (old_tail < shbuf->head && shbuf->head <= new_tail) {
- /* ...need to move head forward */
- c = memchr(shbuf->data + new_tail, '\0',
- shbuf->size - new_tail);
- if (!c) /* no NUL ahead of us, wrap around */
- c = memchr(shbuf->data, '\0', old_tail);
- if (!c) { /* still nothing? point to this msg... */
- shbuf->head = old_tail;
- } else {
- /* convert pointer to offset + skip NUL */
- shbuf->head = c - shbuf->data + 1;
- }
- }
+ if (new_tail < G.shbuf->size) {
/* store message, set new tail */
- memcpy(shbuf->data + old_tail, msg, len);
- shbuf->tail = new_tail;
+ memcpy(G.shbuf->data + old_tail, msg, len);
+ G.shbuf->tail = new_tail;
} else {
- /* we need to break up the message and wrap it around */
/* k == available buffer space ahead of old tail */
- int k = shbuf->size - old_tail - 1;
- if (shbuf->head > old_tail) {
- /* we are going to overwrite head, need to
- * move it out of the way */
- c = memchr(shbuf->data, '\0', old_tail);
- if (!c) { /* nothing? point to this msg... */
- shbuf->head = old_tail;
- } else { /* convert pointer to offset + skip NUL */
- shbuf->head = c - shbuf->data + 1;
- }
- }
+ int k = G.shbuf->size - old_tail;
/* copy what fits to the end of buffer, and repeat */
- memcpy(shbuf->data + old_tail, msg, k);
+ memcpy(G.shbuf->data + old_tail, msg, k);
msg += k;
len -= k;
- shbuf->tail = 0;
+ G.shbuf->tail = 0;
goto again;
}
- if (semop(s_semid, SMwup, 1) == -1) {
+ if (semop(G.s_semid, G.SMwup, 1) == -1) {
bb_perror_msg_and_die("SMwup");
}
if (DEBUG)
- printf("head:%d tail:%d\n", shbuf->head, shbuf->tail);
+ printf("tail:%d\n", G.shbuf->tail);
}
#else
void ipcsyslog_cleanup(void);
void ipcsyslog_init(void);
void log_to_shmem(const char *msg);
-
-
#endif /* FEATURE_IPC_SYSLOG */
/* Print a message to the log file. */
-static void log_locally(char *msg)
+static void log_locally(time_t now, char *msg)
{
- int fd, len = strlen(msg);
+#ifdef SYSLOGD_WRLOCK
+ struct flock fl;
+#endif
+ int len = strlen(msg);
#if ENABLE_FEATURE_IPC_SYSLOG
- if ((option_mask32 & OPT_circularlog) && shbuf) {
+ if ((option_mask32 & OPT_circularlog) && G.shbuf) {
log_to_shmem(msg, len);
return;
}
#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;
+ close(G.logFD);
+ goto reopen;
+ }
+ } else {
+ reopen:
+ 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);
+ if (fd < 0)
+ fd = 2; /* then stderr, dammit */
+ full_write(fd, msg, len);
+ if (fd != 2)
+ close(fd);
+ return;
+ }
+#if ENABLE_FEATURE_ROTATE_LOGFILE
+ {
+ struct stat statf;
+ G.isRegular = (fstat(G.logFD, &statf) == 0 && S_ISREG(statf.st_mode));
+ /* bug (mostly harmless): can wrap around if file > 4gb */
+ G.curFileSize = statf.st_size;
+ }
+#endif
+ }
- again:
- fd = device_open(logFilePath, O_WRONLY | O_CREAT
- | O_NOCTTY | O_APPEND | O_NONBLOCK);
- if (fd >= 0) {
- struct flock fl;
-
- fl.l_whence = SEEK_SET;
- fl.l_start = 0;
- fl.l_len = 1;
- fl.l_type = F_WRLCK;
- fcntl(fd, F_SETLKW, &fl);
+#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 (logFileSize) {
- struct stat statf;
- int r = fstat(fd, &statf);
- if (!r && (statf.st_mode & S_IFREG)
- && (lseek(fd, 0, SEEK_END) > logFileSize)
- ) {
- if (logFileRotate) { /* always 0..99 */
- int i = strlen(logFilePath) + 3 + 1;
- char oldFile[i];
- char newFile[i];
- i = logFileRotate - 1;
- /* rename: f.8 -> f.9; f.7 -> f.8; ... */
- while (1) {
- sprintf(newFile, "%s.%d", logFilePath, i);
- if (i == 0) break;
- sprintf(oldFile, "%s.%d", logFilePath, --i);
- rename(oldFile, newFile);
- }
- /* newFile == "f.0" now */
- rename(logFilePath, newFile);
- fl.l_type = F_UNLCK;
- fcntl(fd, F_SETLKW, &fl);
- close(fd);
- goto again;
- }
- ftruncate(fd, 0);
+ if (G.logFileSize && G.isRegular && G.curFileSize > G.logFileSize) {
+ if (G.logFileRotate) { /* always 0..99 */
+ int i = strlen(G.logFilePath) + 3 + 1;
+ char oldFile[i];
+ char newFile[i];
+ i = G.logFileRotate - 1;
+ /* rename: f.8 -> f.9; f.7 -> f.8; ... */
+ while (1) {
+ 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
- full_write(fd, msg, len);
- fl.l_type = F_UNLCK;
- fcntl(fd, F_SETLKW, &fl);
- close(fd);
- } else {
- /* cannot open logfile? - print to /dev/console then */
- fd = device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
- if (fd < 0)
- fd = 2; /* then stderr, dammit */
- full_write(fd, msg, len);
- if (fd != 2)
- close(fd);
+ close(G.logFD);
+ goto reopen;
+ }
+ ftruncate(G.logFD, 0);
}
+ G.curFileSize +=
+#endif
+ 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)
{
- CODE *c_pri, *c_fac;
+ const CODE *c_pri, *c_fac;
if (pri != 0) {
c_fac = facilitynames;
while (c_fac->c_name) {
if (c_fac->c_val != (LOG_FAC(pri) << 3)) {
- c_fac++; continue;
+ c_fac++;
+ continue;
}
/* facility is found, look for prio */
c_pri = prioritynames;
while (c_pri->c_name) {
if (c_pri->c_val != LOG_PRI(pri)) {
- c_pri++; continue;
+ c_pri++;
+ continue;
}
snprintf(res20, 20, "%s.%s",
c_fac->c_name, c_pri->c_name);
}
}
-/* len parameter is used only for "is there a timestamp?" check
- * NB: some callers cheat and supply 0 when they know
- * that there is no timestamp, short-cutting the test */
+/* len parameter is used only for "is there a timestamp?" check.
+ * NB: some callers cheat and supply len==0 when they know
+ * that there is no timestamp, short-circuiting the test. */
static void timestamp_and_log(int pri, char *msg, int len)
{
- time_t now;
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] != ' '
) {
time(&now);
- timestamp = ctime(&now) + 4;
+ timestamp = ctime(&now) + 4; /* skip day of week */
} else {
+ now = 0;
timestamp = msg;
msg += 16;
}
timestamp[15] = '\0';
- /* Log message locally (to file or shared mem) */
- if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
- if (LOG_PRI(pri) < logLevel) {
- if (option_mask32 & OPT_small)
- msg = xasprintf("%s %s\n", timestamp, msg);
- else {
- char res[20];
- parse_fac_prio_20(pri, res);
- msg = xasprintf("%s %s %s %s\n", timestamp, localHostName, res, msg);
- }
- log_locally(msg);
- free(msg);
- }
+ if (option_mask32 & OPT_small)
+ sprintf(G.printbuf, "%s %s\n", timestamp, msg);
+ else {
+ char res[20];
+ parse_fac_prio_20(pri, res);
+ sprintf(G.printbuf, "%s %.64s %s %s\n", timestamp, G.hostname, res, msg);
}
+
+ /* Log message locally (to file or shared mem) */
+ log_locally(now, G.printbuf);
+}
+
+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);
}
+/* tmpbuf[len] is a NUL byte (set by caller), but there can be other,
+ * embedded NULs. Split messages on each of these NULs, parse prio,
+ * escape control chars and log each locally. */
static void split_escape_and_log(char *tmpbuf, int len)
{
- char line[len * 2 + 1]; /* gcc' cheap alloca */
char *p = tmpbuf;
tmpbuf += len;
while (p < tmpbuf) {
char c;
- char *q = line;
+ char *q = G.parsebuf;
int pri = (LOG_USER | LOG_NOTICE);
if (*p == '<') {
- /* Parse the magic priority number. */
+ /* Parse the magic priority number */
pri = bb_strtou(p + 1, &p, 10);
- if (*p == '>') p++;
- if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) {
+ if (*p == '>')
+ p++;
+ if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
pri = (LOG_USER | LOG_NOTICE);
- }
}
while ((c = *p++)) {
if (c == '\n')
c = ' ';
- if (!(c & ~0x1f)) {
+ if (!(c & ~0x1f) && c != '\t') {
*q++ = '^';
c += '@'; /* ^@, ^A, ^B... */
}
*q++ = c;
}
*q = '\0';
- /* now log it */
- timestamp_and_log(pri, line, q - line);
- }
-}
-static void quit_signal(int sig)
-{
- timestamp_and_log(LOG_SYSLOG | LOG_INFO, "System log daemon exiting", 0);
- puts("System log daemon exiting");
- unlink(dev_log_name);
- if (ENABLE_FEATURE_IPC_SYSLOG)
- ipcsyslog_cleanup();
- exit(1);
+ /* Now log it */
+ if (LOG_PRI(pri) < G.logLevel)
+ timestamp_and_log(pri, G.parsebuf, q - G.parsebuf);
+ }
}
+#ifdef SYSLOGD_MARK
static void do_mark(int sig)
{
- if (markInterval) {
- timestamp_and_log(LOG_SYSLOG | LOG_INFO, "-- MARK --", 0);
- alarm(markInterval);
+ if (G.markInterval) {
+ timestamp_and_log_internal("-- MARK --");
+ alarm(G.markInterval);
}
}
+#endif
-static void do_syslogd(void) ATTRIBUTE_NORETURN;
-static void do_syslogd(void)
+/* Don't inline: prevent struct sockaddr_un to take up space on stack
+ * permanently */
+static NOINLINE int create_socket(void)
{
struct sockaddr_un sunx;
- socklen_t addrLength;
int sock_fd;
- fd_set fds;
-
- /* Set up signal handlers. */
- signal(SIGINT, quit_signal);
- signal(SIGTERM, quit_signal);
- signal(SIGQUIT, quit_signal);
- signal(SIGHUP, SIG_IGN);
- signal(SIGCHLD, SIG_IGN);
-#ifdef SIGCLD
- signal(SIGCLD, SIG_IGN);
-#endif
- signal(SIGALRM, do_mark);
- alarm(markInterval);
-
- dev_log_name = xmalloc_realpath(_PATH_LOG);
- if (!dev_log_name)
- dev_log_name = _PATH_LOG;
-
- /* Unlink old /dev/log (or object it points to) */
- unlink(dev_log_name);
+ char *dev_log_name;
memset(&sunx, 0, sizeof(sunx));
sunx.sun_family = AF_UNIX;
- strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
- sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
- addrLength = sizeof(sunx.sun_family) + strlen(sunx.sun_path);
- if (bind(sock_fd, (struct sockaddr *) &sunx, addrLength) < 0) {
- bb_perror_msg_and_die("cannot connect to socket %s", dev_log_name);
+
+ /* Unlink old /dev/log or object it points to. */
+ /* (if it exists, bind will fail) */
+ strcpy(sunx.sun_path, "/dev/log");
+ dev_log_name = xmalloc_follow_symlinks("/dev/log");
+ if (dev_log_name) {
+ safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
+ free(dev_log_name);
}
+ unlink(sunx.sun_path);
- if (chmod(dev_log_name, 0666) < 0) {
- bb_perror_msg_and_die("cannot set permission on %s", dev_log_name);
+ sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
+ xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
+ chmod("/dev/log", 0666);
+
+ return sock_fd;
+}
+
+#if ENABLE_FEATURE_REMOTE_LOG
+static int try_to_resolve_remote(remoteHost_t *rh)
+{
+ if (!rh->remoteAddr) {
+ unsigned now = monotonic_sec();
+
+ /* Don't resolve name too often - DNS timeouts can be big */
+ if ((now - rh->last_dns_resolve) < DNS_WAIT_SEC)
+ return -1;
+ rh->last_dns_resolve = now;
+ rh->remoteAddr = host2sockaddr(rh->remoteHostname, 514);
+ if (!rh->remoteAddr)
+ return -1;
}
+ return xsocket(rh->remoteAddr->u.sa.sa_family, SOCK_DGRAM, 0);
+}
+#endif
+
+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 (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);
+#ifdef SYSLOGD_MARK
+ signal(SIGALRM, do_mark);
+ alarm(G.markInterval);
+#endif
+ sock_fd = create_socket();
+
if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) {
ipcsyslog_init();
}
- timestamp_and_log(LOG_SYSLOG | LOG_INFO, "syslogd started: BusyBox v" BB_VER, 0);
+ timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER);
- for (;;) {
- FD_ZERO(&fds);
- FD_SET(sock_fd, &fds);
+ while (!bb_got_signal) {
+ ssize_t sz;
- if (select(sock_fd + 1, &fds, NULL, NULL, NULL) < 0) {
- if (errno == EINTR) {
- /* alarm may have happened. */
- continue;
- }
- bb_perror_msg_and_die("select");
+#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 = read(sock_fd, recvbuf, MAX_READ - 1);
+ if (sz < 0) {
+ if (!bb_got_signal)
+ bb_perror_msg("read from /dev/log");
+ break;
}
- if (FD_ISSET(sock_fd, &fds)) {
- int i;
-#define tmpbuf bb_common_bufsiz1
- i = recv(sock_fd, tmpbuf, MAX_READ, 0);
- if (i <= 0)
- bb_perror_msg_and_die("UNIX socket error");
- /* TODO: maybe supress duplicates? */
+ /* Drop trailing '\n' and NULs (typically there is one NUL) */
+ while (1) {
+ if (sz == 0)
+ goto read_again;
+ /* man 3 syslog says: "A trailing newline is added when needed".
+ * However, neither glibc nor uclibc do this:
+ * syslog(prio, "test") sends "test\0" to /dev/log,
+ * syslog(prio, "test\n") sends "test\n\0".
+ * 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 (recvbuf[sz-1] != '\0' && recvbuf[sz-1] != '\n')
+ break;
+ sz--;
+ }
+#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
- /* We are not modifying log messages in any way before send */
- /* Remote site cannot trust _us_ anyway and need to do validation again */
- if (option_mask32 & OPT_remotelog) {
- if (-1 == remoteFD) {
- remoteFD = socket(AF_INET, SOCK_DGRAM, 0);
- }
- if (-1 != remoteFD) {
- /* send message to remote logger, ignore possible error */
- sendto(remoteFD, tmpbuf, i, MSG_DONTWAIT,
- (struct sockaddr *) &remoteAddr,
- sizeof(remoteAddr));
+ /* 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 */
+ 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;
}
}
+ }
#endif
- tmpbuf[i] = '\0';
- split_escape_and_log(tmpbuf, i);
-#undef tmpbuf
- } /* FD_ISSET() */
- } /* for */
+ if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
+ recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */
+ split_escape_and_log(recvbuf, sz);
+ }
+ } /* 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)
+int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int syslogd_main(int argc UNUSED_PARAM, char **argv)
{
+ int opts;
char OPTION_DECL;
- char *p;
-
- /* do normal option parsing */
- opt_complementary = "=0"; /* no non-option params */
- getopt32(argc, argv, OPTION_STR, OPTION_PARAM);
- if (option_mask32 & OPT_mark) // -m
- markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
- //if (option_mask32 & OPT_nofork) // -n
- //if (option_mask32 & OPT_outfile) // -O
- if (option_mask32 & OPT_loglevel) // -l
- logLevel = xatou_range(opt_l, 1, 8);
- //if (option_mask32 & OPT_small) // -S
-#if ENABLE_FEATURE_ROTATE_LOGFILE
- if (option_mask32 & OPT_filesize) // -s
- logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
- if (option_mask32 & OPT_rotatecnt) // -b
- logFileRotate = xatou_range(opt_b, 0, 99);
+#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
- if (option_mask32 & OPT_remotelog) { // -R
- int port = 514;
- p = strchr(opt_R, ':');
- if (p) {
- *p++ = '\0';
- port = xatou16(p);
- }
- remoteAddr.sin_family = AF_INET;
- /* FIXME: looks ip4-specific. need to do better */
- remoteAddr.sin_addr = *(struct in_addr *) *(xgethostbyname(opt_R)->h_addr_list);
- remoteAddr.sin_port = htons(port);
+ 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);
}
- //if (option_mask32 & OPT_locallog) // -L
+#endif
+
+#ifdef SYSLOGD_MARK
+ if (opts & OPT_mark) // -m
+ G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
+#endif
+ //if (opts & OPT_nofork) // -n
+ //if (opts & OPT_outfile) // -O
+ if (opts & OPT_loglevel) // -l
+ G.logLevel = xatou_range(opt_l, 1, 8);
+ //if (opts & OPT_small) // -S
+#if ENABLE_FEATURE_ROTATE_LOGFILE
+ if (opts & OPT_filesize) // -s
+ G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
+ if (opts & OPT_rotatecnt) // -b
+ G.logFileRotate = xatou_range(opt_b, 0, 99);
#endif
#if ENABLE_FEATURE_IPC_SYSLOG
- if ((option_mask32 & OPT_circularlog) && opt_C) // -C
- shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
+ if (opt_C) // -Cn
+ G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
#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(localHostName, sizeof(localHostName));
- p = strchr(localHostName, '.');
- if (p) {
- *p = '\0';
- }
+ G.hostname = safe_gethostname();
+ *strchrnul(G.hostname, '.') = '\0';
- if (!(option_mask32 & OPT_nofork)) {
-#ifdef BB_NOMMU
- vfork_daemon_rexec(0, 1, argc, argv, "-n");
-#else
- xdaemon(0, 1);
-#endif
+ 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;
+ /* 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