Diff of /trunk/mkinitrd-magellan/busybox/sysklogd/syslogd.c

Parent Directory | Revision Log | Patch

	revision 532 by niro, Sat Sep 1 22:45:15 2007 UTC	revision 816 by niro, Fri Apr 24 18:33:46 2009 UTC
#	Line 13	Line 13
13	* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.	* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
14	*/	*/
15
16	#include "busybox.h"	/*
17		* Done in syslogd_and_logger.c:
18		#include "libbb.h"
19		#define SYSLOG_NAMES
20		#define SYSLOG_NAMES_CONST
21		#include <syslog.h>
22		*/
23
24	#include <paths.h>	#include <paths.h>
25	#include <sys/un.h>	#include <sys/un.h>
	/* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
	#define SYSLOG_NAMES
	#include <sys/syslog.h>
26	#include <sys/uio.h>	#include <sys/uio.h>
27
28		#if ENABLE_FEATURE_REMOTE_LOG
29		#include <netinet/in.h>
30		#endif
31
32		#if ENABLE_FEATURE_IPC_SYSLOG
33		#include <sys/ipc.h>
34		#include <sys/sem.h>
35		#include <sys/shm.h>
36		#endif
37
38
39	#define DEBUG 0	#define DEBUG 0
40
41	/* Path to the unix socket */	/* MARK code is not very useful, is bloat, and broken:
42	static char *dev_log_name;	* can deadlock if alarmed to make MARK while writing to IPC buffer
43		* (semaphores are down but do_mark routine tries to down them again) */
44		#undef SYSLOGD_MARK
45
46	/* Path for the file where all log messages are written */	enum {
47	static const char *logFilePath = "/var/log/messages";	MAX_READ = 256,
48	static int logFD = -1;	DNS_WAIT_SEC = 2 * 60,
49		};
50
51	/* interval between marks in seconds */	/* Semaphore operation structures */
52	static int markInterval = 20 * 60;	struct shbuf_ds {
53		int32_t size;   /* size of data - 1 */
54		int32_t tail;   /* end of message list */
55		char data[1];   /* data/messages */
56		};
57
58	/* level of messages to be locally logged */	/* Allows us to have smaller initializer. Ugly. */
59	static int logLevel = 8;	#define GLOBALS \
60		const char *logFilePath;                \
61		int logFD;                              \
62		/* interval between marks in seconds */ \
63		/*int markInterval;*/                   \
64		/* level of messages to be logged */    \
65		int logLevel;                           \
66		USE_FEATURE_ROTATE_LOGFILE( \
67		/* max size of file before rotation */  \
68		unsigned logFileSize;                   \
69		/* number of rotated message files */   \
70		unsigned logFileRotate;                 \
71		unsigned curFileSize;                   \
72		smallint isRegular;                     \
73		) \
74		USE_FEATURE_REMOTE_LOG( \
75		/* udp socket for remote logging */     \
76		int remoteFD;                           \
77		len_and_sockaddr* remoteAddr;           \
78		) \
79		USE_FEATURE_IPC_SYSLOG( \
80		int shmid; /* ipc shared memory id */   \
81		int s_semid; /* ipc semaphore id */     \
82		int shm_size;                           \
83		struct sembuf SMwup[1];                 \
84		struct sembuf SMwdn[3];                 \
85		)
86
87	/* localhost's name */	struct init_globals {
88	static char localHostName[64];	GLOBALS
89		};
90
91	#if ENABLE_FEATURE_ROTATE_LOGFILE	struct globals {
92	/* max size of message file before being rotated */	GLOBALS
93	static unsigned logFileSize = 200 * 1024;
94	/* number of rotated message files */	#if ENABLE_FEATURE_REMOTE_LOG
95	static unsigned logFileRotate = 1;	unsigned last_dns_resolve;
96	static unsigned curFileSize;	char *remoteAddrStr;
	static smallint isRegular;
97	#endif	#endif
98
99		#if ENABLE_FEATURE_IPC_SYSLOG
100		struct shbuf_ds *shbuf;
101		#endif
102		time_t last_log_time;
103		/* localhost's name. We print only first 64 chars */
104		char *hostname;
105
106		/* We recv into recvbuf... */
107		char recvbuf[MAX_READ * (1 + ENABLE_FEATURE_SYSLOGD_DUP)];
108		/* ...then copy to parsebuf, escaping control chars */
109		/* (can grow x2 max) */
110		char parsebuf[MAX_READ*2];
111		/* ...then sprintf into printbuf, adding timestamp (15 chars),
112		* host (64), fac.prio (20) to the message */
113		/* (growth by: 15 + 64 + 20 + delims = ~110) */
114		char printbuf[MAX_READ*2 + 128];
115		};
116
117		static const struct init_globals init_data = {
118		.logFilePath = "/var/log/messages",
119		.logFD = -1,
120		#ifdef SYSLOGD_MARK
121		.markInterval = 20 * 60,
122		#endif
123		.logLevel = 8,
124		#if ENABLE_FEATURE_ROTATE_LOGFILE
125		.logFileSize = 200 * 1024,
126		.logFileRotate = 1,
127		#endif
128	#if ENABLE_FEATURE_REMOTE_LOG	#if ENABLE_FEATURE_REMOTE_LOG
129	#include <netinet/in.h>	.remoteFD = -1,
130	/* udp socket for logging to remote host */	#endif
131	static int remoteFD = -1;	#if ENABLE_FEATURE_IPC_SYSLOG
132	static len_and_sockaddr* remoteAddr;	.shmid = -1,
133	#endif	.s_semid = -1,
134		.shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), // default shm size
135	/* We are using bb_common_bufsiz1 for buffering: */	.SMwup = { {1, -1, IPC_NOWAIT} },
136	enum { MAX_READ = (BUFSIZ/6) & ~0xf };	.SMwdn = { {0, 0}, {1, 0}, {1, +1} },
137	/* We recv into RECVBUF... (size: MAX_READ ~== BUFSIZ/6) */	#endif
138	#define RECVBUF  bb_common_bufsiz1	};
139	/* ...then copy to PARSEBUF, escaping control chars */
140	/* (can grow x2 max ~== BUFSIZ/3) */	#define G (*ptr_to_globals)
141	#define PARSEBUF (bb_common_bufsiz1 + MAX_READ)	#define INIT_G() do { \
142	/* ...then sprintf into PRINTBUF, adding timestamp (15 chars),	SET_PTR_TO_GLOBALS(memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data))); \
143	* host (64), fac.prio (20) to the message */	} while (0)
	/* (growth by: 15 + 64 + 20 + delims = ~110) */
	#define PRINTBUF (bb_common_bufsiz1 + 3*MAX_READ)
	/* totals: BUFSIZ == BUFSIZ/6 + BUFSIZ/3 + (BUFSIZ/3+BUFSIZ/6)
	* -- we have BUFSIZ/6 extra at the ent of PRINTBUF
	* which covers needed ~110 extra bytes (and much more) */
144
145
146	/* Options */	/* Options */
#	Line 82  enum {	Line 153  enum {
153	USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize   ,) // -s	USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize   ,) // -s
154	USE_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt  ,) // -b	USE_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt  ,) // -b
155	USE_FEATURE_REMOTE_LOG(    OPTBIT_remote     ,) // -R	USE_FEATURE_REMOTE_LOG(    OPTBIT_remote     ,) // -R
156	USE_FEATURE_REMOTE_LOG(    OPTBIT_localtoo   ,) // -L	USE_FEATURE_REMOTE_LOG(    OPTBIT_locallog   ,) // -L
157	USE_FEATURE_IPC_SYSLOG(    OPTBIT_circularlog,) // -C	USE_FEATURE_IPC_SYSLOG(    OPTBIT_circularlog,) // -C
158		USE_FEATURE_SYSLOGD_DUP(   OPTBIT_dup        ,) // -D
159
160	OPT_mark        = 1 << OPTBIT_mark    ,	OPT_mark        = 1 << OPTBIT_mark    ,
161	OPT_nofork      = 1 << OPTBIT_nofork  ,	OPT_nofork      = 1 << OPTBIT_nofork  ,
#	Line 93  enum {	Line 165  enum {
165	OPT_filesize    = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize   )) + 0,	OPT_filesize    = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize   )) + 0,
166	OPT_rotatecnt   = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt  )) + 0,	OPT_rotatecnt   = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt  )) + 0,
167	OPT_remotelog   = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_remote     )) + 0,	OPT_remotelog   = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_remote     )) + 0,
168	OPT_locallog    = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_localtoo   )) + 0,	OPT_locallog    = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_locallog   )) + 0,
169	OPT_circularlog = USE_FEATURE_IPC_SYSLOG(    (1 << OPTBIT_circularlog)) + 0,	OPT_circularlog = USE_FEATURE_IPC_SYSLOG(    (1 << OPTBIT_circularlog)) + 0,
170		OPT_dup         = USE_FEATURE_SYSLOGD_DUP(   (1 << OPTBIT_dup        )) + 0,
171	};	};
172	#define OPTION_STR "m:nO:l:S" \	#define OPTION_STR "m:nO:l:S" \
173	USE_FEATURE_ROTATE_LOGFILE("s:" ) \	USE_FEATURE_ROTATE_LOGFILE("s:" ) \
174	USE_FEATURE_ROTATE_LOGFILE("b:" ) \	USE_FEATURE_ROTATE_LOGFILE("b:" ) \
175	USE_FEATURE_REMOTE_LOG(    "R:" ) \	USE_FEATURE_REMOTE_LOG(    "R:" ) \
176	USE_FEATURE_REMOTE_LOG(    "L"  ) \	USE_FEATURE_REMOTE_LOG(    "L"  ) \
177	USE_FEATURE_IPC_SYSLOG(    "C::")	USE_FEATURE_IPC_SYSLOG(    "C::") \
178		USE_FEATURE_SYSLOGD_DUP(   "D"  )
179	#define OPTION_DECL *opt_m, *opt_l \	#define OPTION_DECL *opt_m, *opt_l \
180	USE_FEATURE_ROTATE_LOGFILE(,*opt_s) \	USE_FEATURE_ROTATE_LOGFILE(,*opt_s) \
181	USE_FEATURE_ROTATE_LOGFILE(,*opt_b) \	USE_FEATURE_ROTATE_LOGFILE(,*opt_b) \
	USE_FEATURE_REMOTE_LOG(    ,*opt_R) \
182	USE_FEATURE_IPC_SYSLOG(    ,*opt_C = NULL)	USE_FEATURE_IPC_SYSLOG(    ,*opt_C = NULL)
183	#define OPTION_PARAM &opt_m, &logFilePath, &opt_l \	#define OPTION_PARAM &opt_m, &G.logFilePath, &opt_l \
184	USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \	USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \
185	USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \	USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \
186	USE_FEATURE_REMOTE_LOG(    ,&opt_R) \	USE_FEATURE_REMOTE_LOG(    ,&G.remoteAddrStr) \
187	USE_FEATURE_IPC_SYSLOG(    ,&opt_C)	USE_FEATURE_IPC_SYSLOG(    ,&opt_C)
188
189
190	/* circular buffer variables/structures */	/* circular buffer variables/structures */
191	#if ENABLE_FEATURE_IPC_SYSLOG	#if ENABLE_FEATURE_IPC_SYSLOG
192
193	#if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4	#if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
194	#error Sorry, you must set the syslogd buffer size to at least 4KB.	#error Sorry, you must set the syslogd buffer size to at least 4KB.
195	#error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE	#error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
196	#endif	#endif
197
198	#include <sys/ipc.h>	/* our shared key (syslogd.c and logread.c must be in sync) */
199	#include <sys/sem.h>	enum { KEY_ID = 0x414e4547 }; /* "GENA" */
	#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
200
201	static void ipcsyslog_cleanup(void)	static void ipcsyslog_cleanup(void)
202	{	{
203	if (shmid != -1) {	if (G.shmid != -1) {
204	shmdt(shbuf);	shmdt(G.shbuf);
205	}	}
206	if (shmid != -1) {	if (G.shmid != -1) {
207	shmctl(shmid, IPC_RMID, NULL);	shmctl(G.shmid, IPC_RMID, NULL);
208	}	}
209	if (s_semid != -1) {	if (G.s_semid != -1) {
210	semctl(s_semid, 0, IPC_RMID, 0);	semctl(G.s_semid, 0, IPC_RMID, 0);
211	}	}
212	}	}
213
214	static void ipcsyslog_init(void)	static void ipcsyslog_init(void)
215	{	{
216	if (DEBUG)	if (DEBUG)
217	printf("shmget(%lx, %d,...)\n", KEY_ID, shm_size);	printf("shmget(%x, %d,...)\n", (int)KEY_ID, G.shm_size);
218
219	shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023);	G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644);
220	if (shmid == -1) {	if (G.shmid == -1) {
221	bb_perror_msg_and_die("shmget");	bb_perror_msg_and_die("shmget");
222	}	}
223
224	shbuf = shmat(shmid, NULL, 0);	G.shbuf = shmat(G.shmid, NULL, 0);
225	if (!shbuf) {	if (G.shbuf == (void*) -1L) { /* shmat has bizarre error return */
226	bb_perror_msg_and_die("shmat");	bb_perror_msg_and_die("shmat");
227	}	}
228
229	shbuf->size = shm_size - offsetof(struct shbuf_ds, data);	memset(G.shbuf, 0, G.shm_size);
230	shbuf->head = shbuf->tail = 0;	G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data) - 1;
231		/*G.shbuf->tail = 0;*/
232
233	// we'll trust the OS to set initial semval to 0 (let's hope)	// we'll trust the OS to set initial semval to 0 (let's hope)
234	s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);	G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
235	if (s_semid == -1) {	if (G.s_semid == -1) {
236	if (errno == EEXIST) {	if (errno == EEXIST) {
237	s_semid = semget(KEY_ID, 2, 0);	G.s_semid = semget(KEY_ID, 2, 0);
238	if (s_semid != -1)	if (G.s_semid != -1)
239	return;	return;
240	}	}
241	bb_perror_msg_and_die("semget");	bb_perror_msg_and_die("semget");
#	Line 188  static void ipcsyslog_init(void)	Line 245  static void ipcsyslog_init(void)
245	/* Write message to shared mem buffer */	/* Write message to shared mem buffer */
246	static void log_to_shmem(const char *msg, int len)	static void log_to_shmem(const char *msg, int len)
247	{	{
	/* Why libc insists on these being rw? */
	static struct sembuf SMwup[1] = { {1, -1, IPC_NOWAIT} };
	static struct sembuf SMwdn[3] = { {0, 0}, {1, 0}, {1, +1} };
248	int old_tail, new_tail;	int old_tail, new_tail;
	char *c;
249
250	if (semop(s_semid, SMwdn, 3) == -1) {	if (semop(G.s_semid, G.SMwdn, 3) == -1) {
251	bb_perror_msg_and_die("SMwdn");	bb_perror_msg_and_die("SMwdn");
252	}	}
253
254	/* Circular Buffer Algorithm:	/* Circular Buffer Algorithm:
255	* --------------------------	* --------------------------
256	* tail == position where to store next syslog message.	* tail == position where to store next syslog message.
257	* head == position of next message to retrieve ("print").	* tail's max value is (shbuf->size - 1)
258	* if head == tail, there is no "unprinted" messages left.	* Last byte of buffer is never used and remains NUL.
	* head is typically advanced by separate "reader" program,
	* but if there isn't one, we have to do it ourself.
	* messages are NUL-separated.
259	*/	*/
260	len++; /* length with NUL included */	len++; /* length with NUL included */
261	again:	again:
262	old_tail = shbuf->tail;	old_tail = G.shbuf->tail;
263	new_tail = old_tail + len;	new_tail = old_tail + len;
264	if (new_tail < shbuf->size) {	if (new_tail < G.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;
	}
	}
265	/* store message, set new tail */	/* store message, set new tail */
266	memcpy(shbuf->data + old_tail, msg, len);	memcpy(G.shbuf->data + old_tail, msg, len);
267	shbuf->tail = new_tail;	G.shbuf->tail = new_tail;
268	} else {	} else {
	/* we need to break up the message and wrap it around */
269	/* k == available buffer space ahead of old tail */	/* k == available buffer space ahead of old tail */
270	int k = shbuf->size - old_tail - 1;	int k = G.shbuf->size - old_tail;
	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;
	}
	}
271	/* copy what fits to the end of buffer, and repeat */	/* copy what fits to the end of buffer, and repeat */
272	memcpy(shbuf->data + old_tail, msg, k);	memcpy(G.shbuf->data + old_tail, msg, k);
273	msg += k;	msg += k;
274	len -= k;	len -= k;
275	shbuf->tail = 0;	G.shbuf->tail = 0;
276	goto again;	goto again;
277	}	}
278	if (semop(s_semid, SMwup, 1) == -1) {	if (semop(G.s_semid, G.SMwup, 1) == -1) {
279	bb_perror_msg_and_die("SMwup");	bb_perror_msg_and_die("SMwup");
280	}	}
281	if (DEBUG)	if (DEBUG)
282	printf("head:%d tail:%d\n", shbuf->head, shbuf->tail);	printf("tail:%d\n", G.shbuf->tail);
283	}	}
284	#else	#else
285	void ipcsyslog_cleanup(void);	void ipcsyslog_cleanup(void);
#	Line 266  void log_to_shmem(const char *msg);	Line 289  void log_to_shmem(const char *msg);
289
290
291	/* Print a message to the log file. */	/* Print a message to the log file. */
292	static void log_locally(char *msg)	static void log_locally(time_t now, char *msg)
293	{	{
	static time_t last;
294	struct flock fl;	struct flock fl;
295	int len = strlen(msg);	int len = strlen(msg);
296
297	#if ENABLE_FEATURE_IPC_SYSLOG	#if ENABLE_FEATURE_IPC_SYSLOG
298	if ((option_mask32 & OPT_circularlog) && shbuf) {	if ((option_mask32 & OPT_circularlog) && G.shbuf) {
299	log_to_shmem(msg, len);	log_to_shmem(msg, len);
300	return;	return;
301	}	}
302	#endif	#endif
303	if (logFD >= 0) {	if (G.logFD >= 0) {
304	time_t cur;	/* Reopen log file every second. This allows admin
305	time(&cur);	* to delete the file and not worry about restarting us.
306	if (last != cur) {	* This costs almost nothing since it happens
307	last = cur; /* reopen log file every second */	* _at most_ once a second.
308	close(logFD);	*/
309		if (!now)
310		now = time(NULL);
311		if (G.last_log_time != now) {
312		G.last_log_time = now;
313		close(G.logFD);
314	goto reopen;	goto reopen;
315	}	}
316	} else {	} else {
317	reopen:	reopen:
318	logFD = device_open(logFilePath, O_WRONLY | O_CREAT	G.logFD = open(G.logFilePath, O_WRONLY | O_CREAT
319	| O_NOCTTY | O_APPEND | O_NONBLOCK);	| O_NOCTTY | O_APPEND | O_NONBLOCK,
320	if (logFD < 0) {	0666);
321		if (G.logFD < 0) {
322	/* cannot open logfile? - print to /dev/console then */	/* cannot open logfile? - print to /dev/console then */
323	int fd = device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);	int fd = device_open(DEV_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
324	if (fd < 0)	if (fd < 0)
325	fd = 2; /* then stderr, dammit */	fd = 2; /* then stderr, dammit */
326	full_write(fd, msg, len);	full_write(fd, msg, len);
#	Line 302  static void log_locally(char *msg)	Line 330  static void log_locally(char *msg)
330	}	}
331	#if ENABLE_FEATURE_ROTATE_LOGFILE	#if ENABLE_FEATURE_ROTATE_LOGFILE
332	{	{
333	struct stat statf;	struct stat statf;
334		G.isRegular = (fstat(G.logFD, &statf) == 0 && S_ISREG(statf.st_mode));
335	isRegular = (fstat(logFD, &statf) == 0 && (statf.st_mode & S_IFREG));	/* bug (mostly harmless): can wrap around if file > 4gb */
336	/* bug (mostly harmless): can wrap around if file > 4gb */	G.curFileSize = statf.st_size;
	curFileSize = statf.st_size;
337	}	}
338	#endif	#endif
339	}	}
#	Line 315  static void log_locally(char *msg)	Line 342  static void log_locally(char *msg)
342	fl.l_start = 0;	fl.l_start = 0;
343	fl.l_len = 1;	fl.l_len = 1;
344	fl.l_type = F_WRLCK;	fl.l_type = F_WRLCK;
345	fcntl(logFD, F_SETLKW, &fl);	fcntl(G.logFD, F_SETLKW, &fl);
346
347	#if ENABLE_FEATURE_ROTATE_LOGFILE	#if ENABLE_FEATURE_ROTATE_LOGFILE
348	if (logFileSize && isRegular && curFileSize > logFileSize) {	if (G.logFileSize && G.isRegular && G.curFileSize > G.logFileSize) {
349	if (logFileRotate) { /* always 0..99 */	if (G.logFileRotate) { /* always 0..99 */
350	int i = strlen(logFilePath) + 3 + 1;	int i = strlen(G.logFilePath) + 3 + 1;
351	char oldFile[i];	char oldFile[i];
352	char newFile[i];	char newFile[i];
353	i = logFileRotate - 1;	i = G.logFileRotate - 1;
354	/* rename: f.8 -> f.9; f.7 -> f.8; ... */	/* rename: f.8 -> f.9; f.7 -> f.8; ... */
355	while (1) {	while (1) {
356	sprintf(newFile, "%s.%d", logFilePath, i);	sprintf(newFile, "%s.%d", G.logFilePath, i);
357	if (i == 0) break;	if (i == 0) break;
358	sprintf(oldFile, "%s.%d", logFilePath, --i);	sprintf(oldFile, "%s.%d", G.logFilePath, --i);
359		/* ignore errors - file might be missing */
360	rename(oldFile, newFile);	rename(oldFile, newFile);
361	}	}
362	/* newFile == "f.0" now */	/* newFile == "f.0" now */
363	rename(logFilePath, newFile);	rename(G.logFilePath, newFile);
364	fl.l_type = F_UNLCK;	fl.l_type = F_UNLCK;
365	fcntl(logFD, F_SETLKW, &fl);	fcntl(G.logFD, F_SETLKW, &fl);
366	close(logFD);	close(G.logFD);
367	goto reopen;	goto reopen;
368	}	}
369	ftruncate(logFD, 0);	ftruncate(G.logFD, 0);
370	}	}
371	curFileSize +=	G.curFileSize +=
372	#endif	#endif
373	full_write(logFD, msg, len);	full_write(G.logFD, msg, len);
374	fl.l_type = F_UNLCK;	fl.l_type = F_UNLCK;
375	fcntl(logFD, F_SETLKW, &fl);	fcntl(G.logFD, F_SETLKW, &fl);
376	}	}
377
378	static void parse_fac_prio_20(int pri, char *res20)	static void parse_fac_prio_20(int pri, char *res20)
379	{	{
380	CODE *c_pri, *c_fac;	const CODE *c_pri, *c_fac;
381
382	if (pri != 0) {	if (pri != 0) {
383	c_fac = facilitynames;	c_fac = facilitynames;
384	while (c_fac->c_name) {	while (c_fac->c_name) {
385	if (c_fac->c_val != (LOG_FAC(pri) << 3)) {	if (c_fac->c_val != (LOG_FAC(pri) << 3)) {
386	c_fac++; continue;	c_fac++;
387		continue;
388	}	}
389	/* facility is found, look for prio */	/* facility is found, look for prio */
390	c_pri = prioritynames;	c_pri = prioritynames;
391	while (c_pri->c_name) {	while (c_pri->c_name) {
392	if (c_pri->c_val != LOG_PRI(pri)) {	if (c_pri->c_val != LOG_PRI(pri)) {
393	c_pri++; continue;	c_pri++;
394		continue;
395	}	}
396	snprintf(res20, 20, "%s.%s",	snprintf(res20, 20, "%s.%s",
397	c_fac->c_name, c_pri->c_name);	c_fac->c_name, c_pri->c_name);
#	Line 375  static void parse_fac_prio_20(int pri, c	Line 405  static void parse_fac_prio_20(int pri, c
405	}	}
406
407	/* len parameter is used only for "is there a timestamp?" check.	/* len parameter is used only for "is there a timestamp?" check.
408	* NB: some callers cheat and supply 0 when they know	* NB: some callers cheat and supply len==0 when they know
409	* that there is no timestamp, short-cutting the test. */	* that there is no timestamp, short-circuiting the test. */
410	static void timestamp_and_log(int pri, char *msg, int len)	static void timestamp_and_log(int pri, char *msg, int len)
411	{	{
412	char *timestamp;	char *timestamp;
413		time_t now;
414
415	if (len < 16 || msg[3] != ' ' || msg[6] != ' '	if (len < 16 || msg[3] != ' ' || msg[6] != ' '
416	|| msg[9] != ':' || msg[12] != ':' || msg[15] != ' '	|| msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
417	) {	) {
	time_t now;
418	time(&now);	time(&now);
419	timestamp = ctime(&now) + 4;	timestamp = ctime(&now) + 4; /* skip day of week */
420	} else {	} else {
421		now = 0;
422	timestamp = msg;	timestamp = msg;
423	msg += 16;	msg += 16;
424	}	}
425	timestamp[15] = '\0';	timestamp[15] = '\0';
426
427	/* Log message locally (to file or shared mem) */	if (option_mask32 & OPT_small)
428	if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {	sprintf(G.printbuf, "%s %s\n", timestamp, msg);
429	if (LOG_PRI(pri) < logLevel) {	else {
430	if (option_mask32 & OPT_small)	char res[20];
431	sprintf(PRINTBUF, "%s %s\n", timestamp, msg);	parse_fac_prio_20(pri, res);
432	else {	sprintf(G.printbuf, "%s %.64s %s %s\n", timestamp, G.hostname, res, msg);
	char res[20];
	parse_fac_prio_20(pri, res);
	sprintf(PRINTBUF, "%s %s %s %s\n", timestamp, localHostName, res, msg);
	}
	log_locally(PRINTBUF);
	}
433	}	}
434
435		/* Log message locally (to file or shared mem) */
436		log_locally(now, G.printbuf);
437	}	}
438
439		static void timestamp_and_log_internal(const char *msg)
440		{
441		if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog))
442		return;
443		timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)msg, 0);
444		}
445
446		/* tmpbuf[len] is a NUL byte (set by caller), but there can be other,
447		* embedded NULs. Split messages on each of these NULs, parse prio,
448		* escape control chars and log each locally. */
449	static void split_escape_and_log(char *tmpbuf, int len)	static void split_escape_and_log(char *tmpbuf, int len)
450	{	{
451	char *p = tmpbuf;	char *p = tmpbuf;
#	Line 415  static void split_escape_and_log(char *t	Line 453  static void split_escape_and_log(char *t
453	tmpbuf += len;	tmpbuf += len;
454	while (p < tmpbuf) {	while (p < tmpbuf) {
455	char c;	char c;
456	char *q = PARSEBUF;	char *q = G.parsebuf;
457	int pri = (LOG_USER | LOG_NOTICE);	int pri = (LOG_USER | LOG_NOTICE);
458
459	if (*p == '<') {	if (*p == '<') {
460	/* Parse the magic priority number */	/* Parse the magic priority number */
461	pri = bb_strtou(p + 1, &p, 10);	pri = bb_strtou(p + 1, &p, 10);
462	if (*p == '>') p++;	if (*p == '>')
463	if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) {	p++;
464		if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
465	pri = (LOG_USER | LOG_NOTICE);	pri = (LOG_USER | LOG_NOTICE);
	}
466	}	}
467
468	while ((c = *p++)) {	while ((c = *p++)) {
469	if (c == '\n')	if (c == '\n')
470	c = ' ';	c = ' ';
471	if (!(c & ~0x1f)) {	if (!(c & ~0x1f) && c != '\t') {
472	*q++ = '^';	*q++ = '^';
473	c += '@'; /* ^@, ^A, ^B... */	c += '@'; /* ^@, ^A, ^B... */
474	}	}
475	*q++ = c;	*q++ = c;
476	}	}
477	*q = '\0';	*q = '\0';
478
479	/* Now log it */	/* Now log it */
480	timestamp_and_log(pri, PARSEBUF, q - PARSEBUF);	if (LOG_PRI(pri) < G.logLevel)
481		timestamp_and_log(pri, G.parsebuf, q - G.parsebuf);
482	}	}
483	}	}
484
485	static void quit_signal(int sig)	static void quit_signal(int sig)
486	{	{
487	timestamp_and_log(LOG_SYSLOG | LOG_INFO, "syslogd exiting", 0);	timestamp_and_log_internal("syslogd exiting");
488	puts("syslogd exiting");	puts("syslogd exiting");
	unlink(dev_log_name);
489	if (ENABLE_FEATURE_IPC_SYSLOG)	if (ENABLE_FEATURE_IPC_SYSLOG)
490	ipcsyslog_cleanup();	ipcsyslog_cleanup();
491	exit(1);	kill_myself_with_sig(sig);
492	}	}
493
494		#ifdef SYSLOGD_MARK
495	static void do_mark(int sig)	static void do_mark(int sig)
496	{	{
497	if (markInterval) {	if (G.markInterval) {
498	timestamp_and_log(LOG_SYSLOG | LOG_INFO, "-- MARK --", 0);	timestamp_and_log_internal("-- MARK --");
499	alarm(markInterval);	alarm(G.markInterval);
500	}	}
501	}	}
502		#endif
503
504	static void do_syslogd(void) ATTRIBUTE_NORETURN;	/* Don't inline: prevent struct sockaddr_un to take up space on stack
505	static void do_syslogd(void)	* permanently */
506		static NOINLINE int create_socket(void)
507	{	{
508	struct sockaddr_un sunx;	struct sockaddr_un sunx;
	socklen_t addr_len;
509	int sock_fd;	int sock_fd;
510	fd_set fds;	char *dev_log_name;
	/* 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);
511
512	memset(&sunx, 0, sizeof(sunx));	memset(&sunx, 0, sizeof(sunx));
513	sunx.sun_family = AF_UNIX;	sunx.sun_family = AF_UNIX;
514	strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
515		/* Unlink old /dev/log or object it points to. */
516		/* (if it exists, bind will fail) */
517		strcpy(sunx.sun_path, "/dev/log");
518		dev_log_name = xmalloc_follow_symlinks("/dev/log");
519		if (dev_log_name) {
520		safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
521		free(dev_log_name);
522		}
523		unlink(sunx.sun_path);
524
525	sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);	sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
526	addr_len = sizeof(sunx.sun_family) + strlen(sunx.sun_path);	xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
527	xbind(sock_fd, (struct sockaddr *) &sunx, addr_len);	chmod("/dev/log", 0666);
528
529		return sock_fd;
530		}
531
532		#if ENABLE_FEATURE_REMOTE_LOG
533		static int try_to_resolve_remote(void)
534		{
535		if (!G.remoteAddr) {
536		unsigned now = monotonic_sec();
537
538	if (chmod(dev_log_name, 0666) < 0) {	/* Don't resolve name too often - DNS timeouts can be big */
539	bb_perror_msg_and_die("cannot set permission on %s", dev_log_name);	if ((now - G.last_dns_resolve) < DNS_WAIT_SEC)
540		return -1;
541		G.last_dns_resolve = now;
542		G.remoteAddr = host2sockaddr(G.remoteAddrStr, 514);
543		if (!G.remoteAddr)
544		return -1;
545	}	}
546		return socket(G.remoteAddr->u.sa.sa_family, SOCK_DGRAM, 0);
547		}
548		#endif
549
550		static void do_syslogd(void) NORETURN;
551		static void do_syslogd(void)
552		{
553		int sock_fd;
554		#if ENABLE_FEATURE_SYSLOGD_DUP
555		int last_sz = -1;
556		char *last_buf;
557		char *recvbuf = G.recvbuf;
558		#else
559		#define recvbuf (G.recvbuf)
560		#endif
561
562		/* Set up signal handlers */
563		bb_signals(0
564		+ (1 << SIGINT)
565		+ (1 << SIGTERM)
566		+ (1 << SIGQUIT)
567		, quit_signal);
568		signal(SIGHUP, SIG_IGN);
569		/* signal(SIGCHLD, SIG_IGN); - why? */
570		#ifdef SYSLOGD_MARK
571		signal(SIGALRM, do_mark);
572		alarm(G.markInterval);
573		#endif
574		sock_fd = create_socket();
575
576	if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) {	if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) {
577	ipcsyslog_init();	ipcsyslog_init();
578	}	}
579
580	timestamp_and_log(LOG_SYSLOG | LOG_INFO, "syslogd started: BusyBox v" BB_VER, 0);	timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER);
581
582	for (;;) {	for (;;) {
583	FD_ZERO(&fds);	ssize_t sz;
	FD_SET(sock_fd, &fds);
584
585	if (select(sock_fd + 1, &fds, NULL, NULL, NULL) < 0) {	#if ENABLE_FEATURE_SYSLOGD_DUP
586	if (errno == EINTR) {	last_buf = recvbuf;
587	/* alarm may have happened */	if (recvbuf == G.recvbuf)
588		recvbuf = G.recvbuf + MAX_READ;
589		else
590		recvbuf = G.recvbuf;
591		#endif
592		read_again:
593		sz = safe_read(sock_fd, recvbuf, MAX_READ - 1);
594		if (sz < 0)
595		bb_perror_msg_and_die("read from /dev/log");
596
597		/* Drop trailing '\n' and NULs (typically there is one NUL) */
598		while (1) {
599		if (sz == 0)
600		goto read_again;
601		/* man 3 syslog says: "A trailing newline is added when needed".
602		* However, neither glibc nor uclibc do this:
603		* syslog(prio, "test")   sends "test\0" to /dev/log,
604		* syslog(prio, "test\n") sends "test\n\0".
605		* IOW: newline is passed verbatim!
606		* I take it to mean that it's syslogd's job
607		* to make those look identical in the log files. */
608		if (recvbuf[sz-1] != '\0' && recvbuf[sz-1] != '\n')
609		break;
610		sz--;
611		}
612		#if ENABLE_FEATURE_SYSLOGD_DUP
613		if ((option_mask32 & OPT_dup) && (sz == last_sz))
614		if (memcmp(last_buf, recvbuf, sz) == 0)
615	continue;	continue;
616	}	last_sz = sz;
617	bb_perror_msg_and_die("select");	#endif
	}
	if (FD_ISSET(sock_fd, &fds)) {
	int i;
	i = recv(sock_fd, RECVBUF, MAX_READ - 1, 0);
	if (i <= 0)
	bb_perror_msg_and_die("UNIX socket error");
	/* TODO: maybe suppress duplicates? */
618	#if ENABLE_FEATURE_REMOTE_LOG	#if ENABLE_FEATURE_REMOTE_LOG
619	/* We are not modifying log messages in any way before send */	/* We are not modifying log messages in any way before send */
620	/* Remote site cannot trust _us_ anyway and need to do validation again */	/* Remote site cannot trust _us_ anyway and need to do validation again */
621	if (remoteAddr) {	if (G.remoteAddrStr) {
622	if (-1 == remoteFD) {	if (-1 == G.remoteFD) {
623	remoteFD = socket(remoteAddr->sa.sa_family, SOCK_DGRAM, 0);	G.remoteFD = try_to_resolve_remote();
624	}	if (-1 == G.remoteFD)
625	if (-1 != remoteFD) {	goto no_luck;
	/* send message to remote logger, ignore possible error */
	sendto(remoteFD, RECVBUF, i, MSG_DONTWAIT,
	&remoteAddr->sa, remoteAddr->len);
	}
626	}	}
627	#endif	/* Stock syslogd sends it '\n'-terminated
628	RECVBUF[i] = '\0';	* over network, mimic that */
629	split_escape_and_log(RECVBUF, i);	recvbuf[sz] = '\n';
630	} /* FD_ISSET() */	/* send message to remote logger, ignore possible error */
631	} /* for */	/* TODO: on some errors, close and set G.remoteFD to -1
632		* so that DNS resolution and connect is retried? */
633		sendto(G.remoteFD, recvbuf, sz+1, MSG_DONTWAIT,
634		&G.remoteAddr->u.sa, G.remoteAddr->len);
635		no_luck: ;
636		}
637		#endif
638		if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
639		recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */
640		split_escape_and_log(recvbuf, sz);
641		}
642		} /* for (;;) */
643		#undef recvbuf
644	}	}
645
646	int syslogd_main(int argc, char **argv)	int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
647		int syslogd_main(int argc UNUSED_PARAM, char **argv)
648	{	{
649	char OPTION_DECL;	char OPTION_DECL;
650	char *p;
651		INIT_G();
652		#if ENABLE_FEATURE_REMOTE_LOG
653		G.last_dns_resolve = monotonic_sec() - DNS_WAIT_SEC - 1;
654		#endif
655
656	/* do normal option parsing */	/* do normal option parsing */
657	opt_complementary = "=0"; /* no non-option params */	opt_complementary = "=0"; /* no non-option params */
658	getopt32(argc, argv, OPTION_STR, OPTION_PARAM);	getopt32(argv, OPTION_STR, OPTION_PARAM);
659		#ifdef SYSLOGD_MARK
660	if (option_mask32 & OPT_mark) // -m	if (option_mask32 & OPT_mark) // -m
661	markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;	G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
662		#endif
663	//if (option_mask32 & OPT_nofork) // -n	//if (option_mask32 & OPT_nofork) // -n
664	//if (option_mask32 & OPT_outfile) // -O	//if (option_mask32 & OPT_outfile) // -O
665	if (option_mask32 & OPT_loglevel) // -l	if (option_mask32 & OPT_loglevel) // -l
666	logLevel = xatou_range(opt_l, 1, 8);	G.logLevel = xatou_range(opt_l, 1, 8);
667	//if (option_mask32 & OPT_small) // -S	//if (option_mask32 & OPT_small) // -S
668	#if ENABLE_FEATURE_ROTATE_LOGFILE	#if ENABLE_FEATURE_ROTATE_LOGFILE
669	if (option_mask32 & OPT_filesize) // -s	if (option_mask32 & OPT_filesize) // -s
670	logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;	G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
671	if (option_mask32 & OPT_rotatecnt) // -b	if (option_mask32 & OPT_rotatecnt) // -b
672	logFileRotate = xatou_range(opt_b, 0, 99);	G.logFileRotate = xatou_range(opt_b, 0, 99);
	#endif
	#if ENABLE_FEATURE_REMOTE_LOG
	if (option_mask32 & OPT_remotelog) { // -R
	remoteAddr = host2sockaddr(opt_R, 514);
	}
	//if (option_mask32 & OPT_locallog) // -L
673	#endif	#endif
674	#if ENABLE_FEATURE_IPC_SYSLOG	#if ENABLE_FEATURE_IPC_SYSLOG
675	if (opt_C) // -Cn	if (opt_C) // -Cn
676	shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;	G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
677	#endif	#endif
678
679	/* If they have not specified remote logging, then log locally */	/* If they have not specified remote logging, then log locally */
#	Line 578  int syslogd_main(int argc, char **argv)	Line 681  int syslogd_main(int argc, char **argv)
681	option_mask32 |= OPT_locallog;	option_mask32 |= OPT_locallog;
682
683	/* Store away localhost's name before the fork */	/* Store away localhost's name before the fork */
684	gethostname(localHostName, sizeof(localHostName));	G.hostname = safe_gethostname();
685	p = strchr(localHostName, '.');	*strchrnul(G.hostname, '.') = '\0';
	if (p) {
	*p = '\0';
	}
686
687	if (!(option_mask32 & OPT_nofork)) {	if (!(option_mask32 & OPT_nofork)) {
688	#ifdef BB_NOMMU	bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
	vfork_daemon_rexec(0, 1, argc, argv, "-n");
	#else
	bb_daemonize();
	#endif
689	}	}
690	umask(0);	umask(0);
691		write_pidfile("/var/run/syslogd.pid");
692	do_syslogd();	do_syslogd();
693	/* return EXIT_SUCCESS; */	/* return EXIT_SUCCESS; */
694	}	}
695
696		/* Clean up. Needed because we are included from syslogd_and_logger.c */
697		#undef G
698		#undef GLOBALS
699		#undef INIT_G
700		#undef OPTION_STR
701		#undef OPTION_DECL
702		#undef OPTION_PARAM

---

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Legend: Removed from v.532   changed lines   Added in v.816