syslogd: almost rewritten. Had several obvious bugs...

1 files changed, 263 insertions, 327 deletions

diff --git a/sysklogd/syslogd.c b/sysklogd/syslogd.c
index 453cbda35..9e4bc63c2 100644
--- a/sysklogd/syslogd.c
+++ b/sysklogd/syslogd.c
@@ -15,7 +15,6 @@
 
 #include "busybox.h"
 #include <paths.h>
-#include <stdbool.h>
 #include <sys/un.h>
 
 /* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
@@ -24,36 +23,39 @@
 #include <sys/uio.h>
 
 /* Path to the unix socket */
-static char lfile[MAXPATHLEN];
+static char dev_log_name[MAXPATHLEN];
 
 /* Path for the file where all log messages are written */
 static const char *logFilePath = "/var/log/messages";
 
-#ifdef CONFIG_FEATURE_ROTATE_LOGFILE
+#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;
 #endif
 
 /* interval between marks in seconds */
-static int MarkInterval = 20 * 60;
+static int markInterval = 20 * 60;
 
 /* level of messages to be locally logged */
 static int logLevel = 8;
 
 /* localhost's name */
-static char LocalHostName[64];
+static char localHostName[64];
 
-#ifdef CONFIG_FEATURE_REMOTE_LOG
+#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;
-
+static int remoteFD = -1;
+static struct sockaddr_in remoteAddr;
 #endif
 
+
+/* NB: we may need 2x this amount on stack... */
+enum { MAX_READ = 1024 };
+
+
 /* options */
 /* Correct regardless of combination of CONFIG_xxx */
 enum {
@@ -96,10 +98,10 @@ enum {
 	USE_FEATURE_REMOTE_LOG(    ,&opt_R) \
 	USE_FEATURE_IPC_SYSLOG(    ,&opt_C)
 
-#define MAXLINE         1024	/* maximum line length */
 
 /* circular buffer variables/structures */
-#ifdef CONFIG_FEATURE_IPC_SYSLOG
+#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.
@@ -115,14 +117,11 @@ enum {
 
 // Semaphore operation structures
 static struct shbuf_ds {
-	int size;       // size of data written
-	int head;       // start of message list
-	int tail;       // end of message list
+	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 = NULL;        // shared memory pointer
-
-static struct sembuf SMwup[1] = { {1, -1, IPC_NOWAIT} };	// set SMwup
-static struct sembuf SMwdn[3] = { {0, 0}, {1, 0}, {1, +1} };	// set SMwdn
+} *shbuf;               // shared memory pointer
 
 static int shmid = -1;   // ipc shared memory id
 static int s_semid = -1; // ipc semaphore id
@@ -130,11 +129,9 @@ static int shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024);	// default
 
 static void ipcsyslog_cleanup(void)
 {
-	puts("Exiting syslogd!");
 	if (shmid != -1) {
 		shmdt(shbuf);
 	}
-
 	if (shmid != -1) {
 		shmctl(shmid, IPC_RMID, NULL);
 	}
@@ -145,359 +142,299 @@ static void ipcsyslog_cleanup(void)
 
 static void ipcsyslog_init(void)
 {
-	if (shbuf == NULL) {
-		shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023);
-		if (shmid == -1) {
-			bb_perror_msg_and_die("shmget");
-		}
+	shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023);
+	if (shmid == -1) {
+		bb_perror_msg_and_die("shmget");
+	}
 
-		shbuf = shmat(shmid, NULL, 0);
-		if (!shbuf) {
-			bb_perror_msg_and_die("shmat");
-		}
+	shbuf = shmat(shmid, NULL, 0);
+	if (!shbuf) {
+		bb_perror_msg_and_die("shmat");
+	}
 
-		shbuf->size = shm_size - sizeof(*shbuf);
-		shbuf->head = shbuf->tail = 0;
+	shbuf->size = shm_size - offsetof(struct shbuf_ds, data);
+	shbuf->head = 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) {
-			if (errno == EEXIST) {
-				s_semid = semget(KEY_ID, 2, 0);
-				if (s_semid == -1) {
-					bb_perror_msg_and_die("semget");
-				}
-			} else {
-				bb_perror_msg_and_die("semget");
-			}
+	// 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) {
+		if (errno == EEXIST) {
+			s_semid = semget(KEY_ID, 2, 0);
+			if (s_semid != -1)
+				return;
 		}
-	} else {
-		printf("Buffer already allocated just grab the semaphore?");
+		bb_perror_msg_and_die("semget");
 	}
 }
 
 /* write message to buffer */
-static void circ_message(const char *msg)
+static void log_to_shmem(const char *msg, int len)
 {
-	int l = strlen(msg) + 1;	/* count the whole message w/ '\0' included */
-	const char * const fail_msg = "Can't find the terminator token%s?\n";
+	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) {
 		bb_perror_msg_and_die("SMwdn");
 	}
 
-	/*
-	 * Circular Buffer Algorithm:
+	/* Circular Buffer Algorithm:
 	 * --------------------------
-	 *
-	 * Start-off w/ empty buffer of specific size SHM_SIZ
-	 * Start filling it up w/ messages. I use '\0' as separator to break up messages.
-	 * This is also very handy since we can do printf on message.
-	 *
-	 * Once the buffer is full we need to get rid of the first message in buffer and
-	 * insert the new message. (Note: if the message being added is >1 message then
-	 * we will need to "remove" >1 old message from the buffer). The way this is done
-	 * is the following:
-	 *      When we reach the end of the buffer we set a mark and start from the beginning.
-	 *      Now what about the beginning and end of the buffer? Well we have the "head"
-	 *      index/pointer which is the starting point for the messages and we have "tail"
-	 *      index/pointer which is the ending point for the messages. When we "display" the
-	 *      messages we start from the beginning and continue until we reach "tail". If we
-	 *      reach end of buffer, then we just start from the beginning (offset 0). "head" and
-	 *      "tail" are actually offsets from the beginning of the buffer.
-	 *
-	 * Note: This algorithm uses Linux IPC mechanism w/ shared memory and semaphores to provide
-	 *       a threadsafe way of handling shared memory operations.
+         * 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.
 	 */
-	if ((shbuf->tail + l) < shbuf->size) {
-		/* before we append the message we need to check the HEAD so that we won't
-		   overwrite any of the message that we still need and adjust HEAD to point
-		   to the next message! */
-		if (shbuf->tail < shbuf->head) {
-			if ((shbuf->tail + l) >= shbuf->head) {
-				/* we need to move the HEAD to point to the next message
-				 * Theoretically we have enough room to add the whole message to the
-				 * buffer, because of the first outer IF statement, so we don't have
-				 * to worry about overflows here!
-				 */
-				/* we need to know how many bytes we are overwriting to make enough room */
-				int k = shbuf->tail + l - shbuf->head;
-				char *c =
-					memchr(shbuf->data + shbuf->head + k, '\0',
-						   shbuf->size - (shbuf->head + k));
-				if (c != NULL) { /* do a sanity check just in case! */
-					/* we need to convert pointer to offset + skip the '\0'
-					   since we need to point to the beginning of the next message */
-					shbuf->head = c - shbuf->data + 1;
-					/* Note: HEAD is only used to "retrieve" messages, it's not used
-					   when writing messages into our buffer */
-				} else { /* show an error message to know we messed up? */
-					printf(fail_msg,"");
-					shbuf->head = 0;
-				}
+	len++; /* length with NUL included */
+ again:
+	old_tail = 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;
 			}
 		}
-
-		/* in other cases no overflows have been done yet, so we don't care! */
-		/* we should be ok to append the message now */
-		strncpy(shbuf->data + shbuf->tail, msg, l);	/* append our message */
-		shbuf->tail += l;	/* count full message w/ '\0' terminating char */
+		/* store message, set new tail */
+		memcpy(shbuf->data + old_tail, msg, len);
+		shbuf->tail = new_tail;
 	} else {
-		/* we need to break up the message and "circle" it around */
-		char *c;
-		int k = shbuf->tail + l - shbuf->size;	/* count # of bytes we don't fit */
-
-		/* We need to move HEAD! This is always the case since we are going
-		 * to "circle" the message. */
-		c = memchr(shbuf->data + k, '\0', shbuf->size - k);
-
-		if (c != NULL) {	/* if we don't have '\0'??? weird!!! */
-			/* move head pointer */
-			shbuf->head = c - shbuf->data + 1;
-
-			/* now write the first part of the message */
-			strncpy(shbuf->data + shbuf->tail, msg, l - k - 1);
-
-			/* ALWAYS terminate end of buffer w/ '\0' */
-			shbuf->data[shbuf->size - 1] = '\0';
-
-			/* now write out the rest of the string to the beginning of the buffer */
-			strcpy(shbuf->data, &msg[l - k - 1]);
-
-			/* we need to place the TAIL at the end of the message */
-			shbuf->tail = k + 1;
-		} else {
-			printf(fail_msg, " from the beginning");
-			shbuf->head = shbuf->tail = 0;	/* reset buffer, since it's probably corrupted */
+		/* 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;
+			}
 		}
-
+		/* copy what fits to the end of buffer, and repeat */
+		memcpy(shbuf->data + old_tail, msg, k);
+		msg += k;
+		len -= k;
+		shbuf->tail = 0;
+		goto again;
 	}
 	if (semop(s_semid, SMwup, 1) == -1) {
 		bb_perror_msg_and_die("SMwup");
 	}
-
 }
 #else
 void ipcsyslog_cleanup(void);
 void ipcsyslog_init(void);
-void circ_message(const char *msg);
-#endif							/* CONFIG_FEATURE_IPC_SYSLOG */
+void log_to_shmem(const char *msg);
 
-/* 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 = -1;
-	struct flock fl;
-	va_list arguments;
 
-	fl.l_whence = SEEK_SET;
-	fl.l_start = 0;
-	fl.l_len = 1;
+#endif /* FEATURE_IPC_SYSLOG */
 
-#ifdef CONFIG_FEATURE_IPC_SYSLOG
-	if ((option_mask32 & OPT_circularlog) && shbuf) {
-		char b[1024];
 
-		va_start(arguments, fmt);
-		vsnprintf(b, sizeof(b) - 1, fmt, arguments);
-		va_end(arguments);
-		circ_message(b);
+/* Print a message to the log file. */
+static void log_locally(char *msg)
+{
+	int fd, len = strlen(msg);
 
-	} else
+#if ENABLE_FEATURE_IPC_SYSLOG
+	if ((option_mask32 & OPT_circularlog) && shbuf) {
+		log_to_shmem(msg, len);
+		return;
+	}
 #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 CONFIG_FEATURE_ROTATE_LOGFILE
-		if (ENABLE_FEATURE_ROTATE_LOGFILE && logFileSize > 0 ) {
+#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 > 0) {
-					int i = strlen(logFilePath) + 4;
+			 && (lseek(fd, 0, SEEK_END) > logFileSize)
+			) {
+				if (logFileRotate) { /* always 0..99 */
+					int i = strlen(logFilePath) + 3 + 1;
 					char oldFile[i];
 					char newFile[i];
-					for (i=logFileRotate-1; i>0; i--) {
-						sprintf(oldFile, "%s.%d", logFilePath, i-1);
+					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);
 					}
-					sprintf(newFile, "%s.%d", logFilePath, 0);
+					/* newFile == "f.0" now */
+					rename(logFilePath, newFile);
 					fl.l_type = F_UNLCK;
 					fcntl(fd, F_SETLKW, &fl);
 					close(fd);
-					rename(logFilePath, newFile);
-					fd = device_open(logFilePath,
-						   O_WRONLY | O_CREAT | O_NOCTTY | O_APPEND |
-						   O_NONBLOCK);
-					fl.l_type = F_WRLCK;
-					fcntl(fd, F_SETLKW, &fl);
-				} else {
-					ftruncate(fd, 0);
+					goto again;
 				}
+				ftruncate(fd, 0);
 			}
 		}
 #endif
-		va_start(arguments, fmt);
-		vdprintf(fd, fmt, arguments);
-		va_end(arguments);
+		full_write(fd, msg, len);
 		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. */
+		/* cannot open logfile? - print to /dev/console then */
 		fd = device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
-		if (fd >= 0) {
-			va_start(arguments, fmt);
-			vdprintf(fd, fmt, arguments);
-			va_end(arguments);
+		if (fd < 0)
+			fd = 2; /* then stderr, dammit */
+		full_write(fd, msg, len);
+		if (fd != 2)
 			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)
+static void parse_fac_prio_20(int pri, char *res20)
 {
-	time_t now;
-	char *timestamp;
-	char res[20];
 	CODE *c_pri, *c_fac;
 
 	if (pri != 0) {
 		c_fac = facilitynames;
-		while (c_fac->c_name && !(c_fac->c_val == LOG_FAC(pri) << 3))
-			c_fac++;
-		c_pri = prioritynames;
-		while (c_pri->c_name && !(c_pri->c_val == LOG_PRI(pri)))
-			c_pri++;
-		if (c_fac->c_name == NULL || c_pri->c_name == NULL) {
-			snprintf(res, sizeof(res), "<%d>", pri);
-		} else {
-			snprintf(res, sizeof(res), "%s.%s", c_fac->c_name, c_pri->c_name);
+		while (c_fac->c_name) {
+			if (c_fac->c_val != (LOG_FAC(pri) << 3)) {
+				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;
+				}
+				snprintf(res20, 20, "%s.%s",
+						c_fac->c_name, c_pri->c_name);
+				return;
+			}
+			/* prio not found, bail out */
+			break;
 		}
+		snprintf(res20, 20, "<%d>", pri);
 	}
+}
 
-	if (strlen(msg) < 16 || msg[3] != ' ' || msg[6] != ' ' ||
-		msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') {
+/* 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 */
+static void timestamp_and_log(int pri, char *msg, int len)
+{
+	time_t now;
+	char *timestamp;
+
+	if (len < 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;
 	}
+	timestamp[15] = '\0';
 
-	/* todo: supress duplicates */
-
-#ifdef CONFIG_FEATURE_REMOTE_LOG
-	if (option_mask32 & OPT_remotelog) {
-		char line[MAXLINE + 1];
-		/* trying connect the socket */
-		if (-1 == remotefd) {
-			remotefd = socket(AF_INET, SOCK_DGRAM, 0);
-		}
-		/* if we have a valid socket, send the message */
-		if (-1 != remotefd) {
-			snprintf(line, sizeof(line), "<%d>%s", pri, msg);
-			/* send message to remote logger, ignore possible error */
-			sendto(remotefd, line, strlen(line), 0,
-					(struct sockaddr *) &remoteaddr, sizeof(remoteaddr));
+	/* 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_locallog)
-#endif
-	{
-		/* now spew out the message to wherever it is supposed to go */
-		if (pri == 0 || LOG_PRI(pri) < logLevel) {
-			if (option_mask32 & OPT_small)
-				message("%s %s\n", timestamp, msg);
-			else
-				message("%s %s %s %s\n", timestamp, LocalHostName, res, msg);
+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;
+		int pri = (LOG_USER | LOG_NOTICE);
+
+		if (*p == '<') {
+			/* Parse the magic priority number. */
+			pri = bb_strtou(p + 1, &p, 10);
+			if (*p == '>') p++;
+			if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) {
+				pri = (LOG_USER | LOG_NOTICE);
+			}
 		}
+
+		while ((c = *p++)) {
+			if (c == '\n')
+				c = ' ';
+			if (!(c & ~0x1f)) {
+				*q++ = '^';
+				c += '@'; /* ^@, ^A, ^B... */
+			}
+			*q++ = c;
+		}
+		*q = '\0';
+		/* now log it */
+		timestamp_and_log(pri, line, q - line);
 	}
 }
 
 static void quit_signal(int sig)
 {
-	logMessage(LOG_SYSLOG | LOG_INFO, "System log daemon exiting.");
-	unlink(lfile);
+	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);
 }
 
-static void domark(int sig)
+static void do_mark(int sig)
 {
-	if (MarkInterval > 0) {
-		logMessage(LOG_SYSLOG | LOG_INFO, "-- MARK --");
-		alarm(MarkInterval);
+	if (markInterval) {
+		timestamp_and_log(LOG_SYSLOG | LOG_INFO, "-- MARK --", 0);
+		alarm(markInterval);
 	}
 }
 
-/* This must be a #define, since when CONFIG_DEBUG and BUFFERS_GO_IN_BSS are
- * enabled, we otherwise get a "storage size isn't constant error. */
-static int serveConnection(char *tmpbuf, int n_read)
-{
-	char *p = tmpbuf;
-
-	while (p < tmpbuf + n_read) {
-
-		int pri = (LOG_USER | LOG_NOTICE);
-		int num_lt = 0;
-		char line[MAXLINE + 1];
-		unsigned char c;
-		char *q = line;
-
-		while ((c = *p) && q < &line[sizeof(line) - 1]) {
-			if (c == '<' && num_lt == 0) {
-				/* Parse the magic priority number. */
-				num_lt++;
-				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';
-		p++;
-		/* Now log it */
-		logMessage(pri, line);
-	}
-	return n_read;
-}
-
-static void doSyslogd(void) ATTRIBUTE_NORETURN;
-static void doSyslogd(void)
+static void do_syslogd(void) ATTRIBUTE_NORETURN;
+static void do_syslogd(void)
 {
 	struct sockaddr_un sunx;
 	socklen_t addrLength;
-
 	int sock_fd;
 	fd_set fds;
 
@@ -510,31 +447,31 @@ static void doSyslogd(void)
 #ifdef SIGCLD
 	signal(SIGCLD, SIG_IGN);
 #endif
-	signal(SIGALRM, domark);
-	alarm(MarkInterval);
+	signal(SIGALRM, do_mark);
+	alarm(markInterval);
 
-	/* Create the syslog file so realpath() can work. */
-	if (realpath(_PATH_LOG, lfile) != NULL) {
-		unlink(lfile);
+	/* Unlink old /dev/log (or object it points to) */
+	if (realpath(_PATH_LOG, dev_log_name) != NULL) {
+		unlink(dev_log_name);
 	}
 
 	memset(&sunx, 0, sizeof(sunx));
 	sunx.sun_family = AF_UNIX;
-	strncpy(sunx.sun_path, lfile, sizeof(sunx.sun_path));
+	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", lfile);
+		bb_perror_msg_and_die("cannot connect to socket %s", dev_log_name);
 	}
 
-	if (chmod(lfile, 0666) < 0) {
-		bb_perror_msg_and_die("cannot set permission on %s", lfile);
+	if (chmod(dev_log_name, 0666) < 0) {
+		bb_perror_msg_and_die("cannot set permission on %s", dev_log_name);
 	}
 	if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) {
 		ipcsyslog_init();
 	}
 
-	logMessage(LOG_SYSLOG | LOG_INFO, "syslogd started: " "BusyBox v" BB_VER );
+	timestamp_and_log(LOG_SYSLOG | LOG_INFO, "syslogd started: BusyBox v" BB_VER, 0);
 
 	for (;;) {
 		FD_ZERO(&fds);
@@ -550,24 +487,33 @@ static void doSyslogd(void)
 
 		if (FD_ISSET(sock_fd, &fds)) {
 			int i;
-#if MAXLINE > BUFSIZ
-# define TMP_BUF_SZ BUFSIZ
-#else
-# define TMP_BUF_SZ MAXLINE
-#endif
 #define tmpbuf bb_common_bufsiz1
-
-			if ((i = recv(sock_fd, tmpbuf, TMP_BUF_SZ, 0)) > 0) {
-				tmpbuf[i] = '\0';
-				serveConnection(tmpbuf, i);
-			} else {
+			i = recv(sock_fd, tmpbuf, MAX_READ, 0);
+			if (i <= 0)
 				bb_perror_msg_and_die("UNIX socket error");
+			/* TODO: maybe supress duplicates? */
+#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));
+				}
 			}
-		}				/* FD_ISSET() */
-	}					/* for main loop */
+#endif
+			tmpbuf[i] = '\0';
+			split_escape_and_log(tmpbuf, i);
+#undef tmpbuf
+		} /* FD_ISSET() */
+	} /* for */
 }
 
-
 int syslogd_main(int argc, char **argv)
 {
 	char OPTION_DECL;
@@ -575,46 +521,37 @@ int syslogd_main(int argc, char **argv)
 
 	/* do normal option parsing */
 	getopt32(argc, argv, OPTION_STR, OPTION_PARAM);
-	if (option_mask32 & OPT_mark) MarkInterval = xatoul_range(opt_m, 0, INT_MAX/60) * 60; // -m
+	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 = xatoi_u(opt_l);
-		/* Valid levels are between 1 and 8 */
-		if (logLevel < 1 || logLevel > 8)
-			bb_show_usage();
-	}
+	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) logFileSize = xatoul_range(opt_s, 0, INT_MAX/1024) * 1024; // -s
-	if (option_mask32 & OPT_rotatecnt) { // -b
-		logFileRotate = xatoi_u(opt_b);
-		if (logFileRotate > 99) logFileRotate = 99; 
-	}
+	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);
 #endif
 #if ENABLE_FEATURE_REMOTE_LOG
 	if (option_mask32 & OPT_remotelog) { // -R
 		int port = 514;
-		char *host = xstrdup(opt_R);
-		p = strchr(host, ':');
+		p = strchr(opt_R, ':');
 		if (p) {
-			port = xatou16(p + 1);
-			*p = '\0';
+			*p++ = '\0';
+			port = xatou16(p);
 		}
-		remoteaddr.sin_family = AF_INET;
+		remoteAddr.sin_family = AF_INET;
 		/* FIXME: looks ip4-specific. need to do better */
-		remoteaddr.sin_addr = *(struct in_addr *) *(xgethostbyname(host)->h_addr_list);
-		remoteaddr.sin_port = htons(port);
-		free(host);
+		remoteAddr.sin_addr = *(struct in_addr *) *(xgethostbyname(opt_R)->h_addr_list);
+		remoteAddr.sin_port = htons(port);
 	}
 	//if (option_mask32 & OPT_locallog) // -L
 #endif
 #if ENABLE_FEATURE_IPC_SYSLOG
-	if (option_mask32 & OPT_circularlog) { // -C
-		if (opt_C) {
-			shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
-		}
-	}
+	if ((option_mask32 & OPT_circularlog) && opt_C) // -C
+		shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
 #endif
 
 	/* If they have not specified remote logging, then log locally */
@@ -622,14 +559,12 @@ int syslogd_main(int argc, char **argv)
 		option_mask32 |= OPT_locallog;
 
 	/* Store away localhost's name before the fork */
-	gethostname(LocalHostName, sizeof(LocalHostName));
-	p = strchr(LocalHostName, '.');
+	gethostname(localHostName, sizeof(localHostName));
+	p = strchr(localHostName, '.');
 	if (p) {
 		*p = '\0';
 	}
 
-	umask(0);
-
 	if (!(option_mask32 & OPT_nofork)) {
 #ifdef BB_NOMMU
 		vfork_daemon_rexec(0, 1, argc, argv, "-n");
@@ -637,7 +572,8 @@ int syslogd_main(int argc, char **argv)
 		xdaemon(0, 1);
 #endif
 	}
-	doSyslogd();
+	umask(0);
+	do_syslogd();
 
 	return EXIT_SUCCESS;
 }