/*
* Mini syslogd implementation for busybox
*
- * Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen
- * Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
*
*
* Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
-#include <stdio.h>
-#include <stdlib.h>
-#include <ctype.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <netdb.h>
+#include "busybox.h"
#include <paths.h>
-#include <signal.h>
-#include <stdarg.h>
-#include <time.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/socket.h>
-#include <sys/types.h>
#include <sys/un.h>
-#include <sys/param.h>
-#include "busybox.h"
+/* SYSLOG_NAMES defined to pull some extra junk from syslog.h: */
+/* prioritynames[] and facilitynames[]. uclibc pulls those in _rwdata_! :( */
-/* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
#define SYSLOG_NAMES
#include <sys/syslog.h>
#include <sys/uio.h>
-/* Path for the file where all log messages are written */
-#define __LOG_FILE "/var/log/messages"
+#if ENABLE_FEATURE_REMOTE_LOG
+#include <netinet/in.h>
+#endif
-/* Path to the unix socket */
-static char lfile[MAXPATHLEN];
+#if ENABLE_FEATURE_IPC_SYSLOG
+#include <sys/ipc.h>
+#include <sys/sem.h>
+#include <sys/shm.h>
+#endif
-static char *logFilePath = __LOG_FILE;
-/* interval between marks in seconds */
-static int MarkInterval = 20 * 60;
+#define DEBUG 0
-/* localhost's name */
-static char LocalHostName[64];
+// Semaphore operation structures
+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
+}; // shared memory pointer
+
+struct globals {
+
+ const char *logFilePath;
+ int logFD;
+
+ /* This 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) */
+#ifdef SYSLOGD_MARK
+ /* interval between marks in seconds */
+ int markInterval;
+#endif
-#ifdef CONFIG_FEATURE_REMOTE_LOG
-#include <netinet/in.h>
-/* udp socket for logging to remote host */
-static int remotefd = -1;
+ /* level of messages to be locally logged */
+ int logLevel;
-/* where do we log? */
-static char *RemoteHost;
+#if ENABLE_FEATURE_ROTATE_LOGFILE
+ /* max size of message file before being rotated */
+ unsigned logFileSize;
+ /* number of rotated message files */
+ unsigned logFileRotate;
+ unsigned curFileSize;
+ smallint isRegular;
+#endif
-/* what port to log to? */
-static int RemotePort = 514;
+#if ENABLE_FEATURE_REMOTE_LOG
+ /* udp socket for logging to remote host */
+ int remoteFD;
+ len_and_sockaddr* remoteAddr;
+#endif
-/* To remote log or not to remote log, that is the question. */
-static int doRemoteLog = FALSE;
-static int local_logging = FALSE;
+#if ENABLE_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 shbuf_ds *shbuf;
#endif
+ time_t last_log_time;
+ /* localhost's name */
+ char localHostName[64];
+
+}; /* struct globals */
-#define MAXLINE 1024 /* maximum line length */
+static const struct globals init_globals = {
+ .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_REMOTE_LOG
+ .remoteFD = -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
+ // FIXME: hidden tail with lotsa zeroes is here....
+};
+
+#define G (*ptr_to_globals)
+
+
+/* We are using bb_common_bufsiz1 for buffering: */
+enum { MAX_READ = (BUFSIZ/6) & ~0xf };
+/* We recv into RECVBUF... (size: MAX_READ ~== BUFSIZ/6) */
+#define RECVBUF bb_common_bufsiz1
+/* ...then copy to PARSEBUF, escaping control chars */
+/* (can grow x2 max ~== BUFSIZ/3) */
+#define PARSEBUF (bb_common_bufsiz1 + MAX_READ)
+/* ...then sprintf into PRINTBUF, adding timestamp (15 chars),
+ * host (64), fac.prio (20) to the message */
+/* (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) */
+
+
+/* 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
+
+ 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,
+};
+#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::")
+#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, &G.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)
/* circular buffer variables/structures */
-#ifdef CONFIG_FEATURE_IPC_SYSLOG
-#if __GNU_LIBRARY__ < 5
-#error Sorry. Looks like you are using libc5.
-#error libc5 shm support isnt good enough.
-#error Please disable CONFIG_FEATURE_IPC_SYSLOG
-#endif
+#if ENABLE_FEATURE_IPC_SYSLOG
-#include <sys/ipc.h>
-#include <sys/sem.h>
-#include <sys/shm.h>
+#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
/* our shared key */
-static const long KEY_ID = 0x414e4547; /*"GENA" */
-
-// 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
- char data[1]; // data/messages
-} *buf = 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
-
-static int shmid = -1; // ipc shared memory id
-static int s_semid = -1; // ipc semaphore id
-int data_size = 16000; // data size
-int shm_size = 16000 + sizeof(*buf); // our buffer size
-static int circular_logging = FALSE;
+#define KEY_ID ((long)0x414e4547) /* "GENA" */
-/*
- * sem_up - up()'s a semaphore.
- */
-static inline void sem_up(int semid)
+static void ipcsyslog_cleanup(void)
{
- if (semop(semid, SMwup, 1) == -1) {
- perror_msg_and_die("semop[SMwup]");
+ if (G.shmid != -1) {
+ shmdt(G.shbuf);
}
-}
-
-/*
- * sem_down - down()'s a semaphore
- */
-static inline void sem_down(int semid)
-{
- if (semop(semid, SMwdn, 3) == -1) {
- perror_msg_and_die("semop[SMwdn]");
+ if (G.shmid != -1) {
+ shmctl(G.shmid, IPC_RMID, NULL);
+ }
+ if (G.s_semid != -1) {
+ semctl(G.s_semid, 0, IPC_RMID, 0);
}
}
-
-void ipcsyslog_cleanup(void)
+static void ipcsyslog_init(void)
{
- printf("Exiting Syslogd!\n");
- if (shmid != -1) {
- shmdt(buf);
- }
+ if (DEBUG)
+ printf("shmget(%lx, %d,...)\n", KEY_ID, G.shm_size);
- if (shmid != -1) {
- shmctl(shmid, IPC_RMID, NULL);
+ G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 1023);
+ if (G.shmid == -1) {
+ bb_perror_msg_and_die("shmget");
}
- if (s_semid != -1) {
- semctl(s_semid, 0, IPC_RMID, 0);
- }
-}
-void ipcsyslog_init(void)
-{
- if (buf == NULL) {
- if ((shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023)) == -1) {
- perror_msg_and_die("shmget");
- }
-
- if ((buf = shmat(shmid, NULL, 0)) == NULL) {
- perror_msg_and_die("shmat");
- }
+ G.shbuf = shmat(G.shmid, NULL, 0);
+ if (!G.shbuf) {
+ bb_perror_msg_and_die("shmat");
+ }
- buf->size = data_size;
- buf->head = buf->tail = 0;
+ G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data);
+ G.shbuf->head = G.shbuf->tail = 0;
- // we'll trust the OS to set initial semval to 0 (let's hope)
- if ((s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023)) == -1) {
- if (errno == EEXIST) {
- if ((s_semid = semget(KEY_ID, 2, 0)) == -1) {
- perror_msg_and_die("semget");
- }
- } else {
- perror_msg_and_die("semget");
- }
+ // we'll trust the OS to set initial semval to 0 (let's hope)
+ G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
+ if (G.s_semid == -1) {
+ if (errno == EEXIST) {
+ G.s_semid = semget(KEY_ID, 2, 0);
+ if (G.s_semid != -1)
+ return;
}
- } else {
- printf("Buffer already allocated just grab the semaphore?");
+ bb_perror_msg_and_die("semget");
}
}
-/* write message to buffer */
-void circ_message(const char *msg)
+/* Write message to shared mem buffer */
+static void log_to_shmem(const char *msg, int len)
{
- int l = strlen(msg) + 1; /* count the whole message w/ '\0' included */
+ int old_tail, new_tail;
+ char *c;
- sem_down(s_semid);
+ if (semop(G.s_semid, G.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 threasafe 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 ((buf->tail + l) < buf->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 (buf->tail < buf->head) {
- if ((buf->tail + l) >= buf->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!
- */
- int k = buf->tail + l - buf->head; /* we need to know how many bytes
- we are overwriting to make
- enough room */
- char *c =
- memchr(buf->data + buf->head + k, '\0',
- buf->size - (buf->head + k));
- if (c != NULL) { /* do a sanity check just in case! */
- buf->head = c - buf->data + 1; /* we need to convert pointer to
- offset + skip the '\0' since
- we need to point to the beginning
- of the next message */
- /* 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("Weird! Can't find the terminator token??? \n");
- buf->head = 0;
- }
+ len++; /* length with NUL included */
+ again:
+ old_tail = G.shbuf->tail;
+ new_tail = old_tail + len;
+ if (new_tail < G.shbuf->size) {
+ /* No need to move head if shbuf->head <= old_tail,
+ * else... */
+ if (old_tail < G.shbuf->head && G.shbuf->head <= new_tail) {
+ /* ...need to move head forward */
+ c = memchr(G.shbuf->data + new_tail, '\0',
+ G.shbuf->size - new_tail);
+ if (!c) /* no NUL ahead of us, wrap around */
+ c = memchr(G.shbuf->data, '\0', old_tail);
+ if (!c) { /* still nothing? point to this msg... */
+ G.shbuf->head = old_tail;
+ } else {
+ /* convert pointer to offset + skip NUL */
+ G.shbuf->head = c - G.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(buf->data + buf->tail, msg, l); /* append our message */
- buf->tail += l; /* count full message w/ '\0' terminating char */
+ /* store message, set new tail */
+ memcpy(G.shbuf->data + old_tail, msg, len);
+ G.shbuf->tail = new_tail;
} else {
- /* we need to break up the message and "circle" it around */
- char *c;
- int k = buf->tail + l - buf->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(buf->data + k, '\0', buf->size - k);
-
- if (c != NULL) { /* if we don't have '\0'??? weird!!! */
- /* move head pointer */
- buf->head = c - buf->data + 1;
-
- /* now write the first part of the message */
- strncpy(buf->data + buf->tail, msg, l - k - 1);
-
- /* ALWAYS terminate end of buffer w/ '\0' */
- buf->data[buf->size - 1] = '\0';
-
- /* now write out the rest of the string to the beginning of the buffer */
- strcpy(buf->data, &msg[l - k - 1]);
-
- /* we need to place the TAIL at the end of the message */
- buf->tail = k + 1;
- } else {
- printf
- ("Weird! Can't find the terminator token from the beginning??? \n");
- buf->head = buf->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 = G.shbuf->size - old_tail - 1;
+ if (G.shbuf->head > old_tail) {
+ /* we are going to overwrite head, need to
+ * move it out of the way */
+ c = memchr(G.shbuf->data, '\0', old_tail);
+ if (!c) { /* nothing? point to this msg... */
+ G.shbuf->head = old_tail;
+ } else { /* convert pointer to offset + skip NUL */
+ G.shbuf->head = c - G.shbuf->data + 1;
+ }
}
-
+ /* copy what fits to the end of buffer, and repeat */
+ memcpy(G.shbuf->data + old_tail, msg, k);
+ msg += k;
+ len -= k;
+ G.shbuf->tail = 0;
+ goto again;
}
- sem_up(s_semid);
+ if (semop(G.s_semid, G.SMwup, 1) == -1) {
+ bb_perror_msg_and_die("SMwup");
+ }
+ if (DEBUG)
+ printf("head:%d tail:%d\n", G.shbuf->head, G.shbuf->tail);
}
-#endif /* CONFIG_FEATURE_IPC_SYSLOG */
+#else
+void ipcsyslog_cleanup(void);
+void ipcsyslog_init(void);
+void log_to_shmem(const char *msg);
+#endif /* FEATURE_IPC_SYSLOG */
+
-/* 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, ...)
+static void log_locally(char *msg)
{
- int fd;
struct flock fl;
- va_list arguments;
+ int len = strlen(msg);
+
+#if ENABLE_FEATURE_IPC_SYSLOG
+ if ((option_mask32 & OPT_circularlog) && G.shbuf) {
+ log_to_shmem(msg, len);
+ return;
+ }
+#endif
+ if (G.logFD >= 0) {
+ time_t cur;
+ time(&cur);
+ if (G.last_log_time != cur) {
+ G.last_log_time = cur; /* reopen log file every second */
+ close(G.logFD);
+ goto reopen;
+ }
+ } else {
+ reopen:
+ G.logFD = device_open(G.logFilePath, O_WRONLY | O_CREAT
+ | O_NOCTTY | O_APPEND | O_NONBLOCK);
+ if (G.logFD < 0) {
+ /* cannot open logfile? - print to /dev/console then */
+ int 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);
+ return;
+ }
+#if ENABLE_FEATURE_ROTATE_LOGFILE
+ {
+ struct stat statf;
+
+ G.isRegular = (fstat(G.logFD, &statf) == 0 && (statf.st_mode & S_IFREG));
+ /* bug (mostly harmless): can wrap around if file > 4gb */
+ G.curFileSize = statf.st_size;
+ }
+#endif
+ }
fl.l_whence = SEEK_SET;
fl.l_start = 0;
fl.l_len = 1;
-
-#ifdef CONFIG_FEATURE_IPC_SYSLOG
- if ((circular_logging == TRUE) && (buf != NULL)) {
- char b[1024];
-
- va_start(arguments, fmt);
- vsnprintf(b, sizeof(b) - 1, fmt, arguments);
- va_end(arguments);
- circ_message(b);
-
- } else
-#endif
- if ((fd =
- device_open(logFilePath,
- O_WRONLY | O_CREAT | O_NOCTTY | O_APPEND |
- O_NONBLOCK)) >= 0) {
- fl.l_type = F_WRLCK;
- fcntl(fd, F_SETLKW, &fl);
- va_start(arguments, fmt);
- vdprintf(fd, fmt, arguments);
- va_end(arguments);
- 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. */
- if ((fd =
- device_open(_PATH_CONSOLE,
- O_WRONLY | O_NOCTTY | O_NONBLOCK)) >= 0) {
- va_start(arguments, fmt);
- vdprintf(fd, fmt, arguments);
- va_end(arguments);
- close(fd);
- } else {
- fprintf(stderr, "Bummer, can't print: ");
- va_start(arguments, fmt);
- vfprintf(stderr, fmt, arguments);
- fflush(stderr);
- va_end(arguments);
+ fl.l_type = F_WRLCK;
+ fcntl(G.logFD, F_SETLKW, &fl);
+
+#if ENABLE_FEATURE_ROTATE_LOGFILE
+ 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);
+ rename(oldFile, newFile);
+ }
+ /* newFile == "f.0" now */
+ rename(G.logFilePath, newFile);
+ fl.l_type = F_UNLCK;
+ fcntl(G.logFD, F_SETLKW, &fl);
+ close(G.logFD);
+ goto reopen;
}
+ ftruncate(G.logFD, 0);
}
+ G.curFileSize +=
+#endif
+ full_write(G.logFD, msg, len);
+ fl.l_type = F_UNLCK;
+ fcntl(G.logFD, F_SETLKW, &fl);
}
-static void logMessage(int pri, char *msg)
+static void parse_fac_prio_20(int pri, char *res20)
{
- time_t now;
- char *timestamp;
- static char res[20] = "";
CODE *c_pri, *c_fac;
if (pri != 0) {
- for (c_fac = facilitynames;
- c_fac->c_name && !(c_fac->c_val == LOG_FAC(pri) << 3); c_fac++);
- for (c_pri = prioritynames;
- 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);
+ c_fac = facilitynames;
+ 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)
+{
+ char *timestamp;
+
+ if (len < 16 || msg[3] != ' ' || msg[6] != ' '
+ || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
+ ) {
+ time_t now;
time(&now);
timestamp = ctime(&now) + 4;
- timestamp[15] = '\0';
} else {
timestamp = msg;
- timestamp[15] = '\0';
msg += 16;
}
-
- /* todo: supress duplicates */
-
-#ifdef CONFIG_FEATURE_REMOTE_LOG
- /* send message to remote logger */
- if (-1 != remotefd) {
- static const int IOV_COUNT = 2;
- struct iovec iov[IOV_COUNT];
- struct iovec *v = iov;
-
- memset(&res, 0, sizeof(res));
- snprintf(res, sizeof(res), "<%d>", pri);
- v->iov_base = res;
- v->iov_len = strlen(res);
- v++;
-
- v->iov_base = msg;
- v->iov_len = strlen(msg);
- writev_retry:
- if ((-1 == writev(remotefd, iov, IOV_COUNT)) && (errno == EINTR)) {
- goto writev_retry;
+ timestamp[15] = '\0';
+
+ /* Log message locally (to file or shared mem) */
+ if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
+ if (LOG_PRI(pri) < G.logLevel) {
+ if (option_mask32 & OPT_small)
+ sprintf(PRINTBUF, "%s %s\n", timestamp, msg);
+ else {
+ char res[20];
+ parse_fac_prio_20(pri, res);
+ sprintf(PRINTBUF, "%s %s %s %s\n", timestamp, G.localHostName, res, msg);
+ }
+ log_locally(PRINTBUF);
}
}
- if (local_logging == TRUE)
-#endif
- /* now spew out the message to wherever it is supposed to go */
- message("%s %s %s %s\n", timestamp, LocalHostName, res, msg);
-}
-
-static void quit_signal(int sig)
-{
- logMessage(LOG_SYSLOG | LOG_INFO, "System log daemon exiting.");
- unlink(lfile);
-#ifdef CONFIG_FEATURE_IPC_SYSLOG
- ipcsyslog_cleanup();
-#endif
-
- exit(TRUE);
-}
-
-static void domark(int sig)
-{
- if (MarkInterval > 0) {
- logMessage(LOG_SYSLOG | LOG_INFO, "-- MARK --");
- alarm(MarkInterval);
- }
}
-/* This must be a #define, since when DODEBUG 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)
+static void split_escape_and_log(char *tmpbuf, int len)
{
char *p = tmpbuf;
- while (p < tmpbuf + n_read) {
-
+ tmpbuf += len;
+ while (p < tmpbuf) {
+ char c;
+ char *q = PARSEBUF;
int pri = (LOG_USER | LOG_NOTICE);
- char line[MAXLINE + 1];
- unsigned char c;
- char *q = line;
+ 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) && q < &line[sizeof(line) - 1]) {
- if (c == '<') {
- /* Parse the magic priority number. */
- pri = 0;
- while (isdigit(*(++p))) {
- pri = 10 * pri + (*p - '0');
- }
- if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) {
- pri = (LOG_USER | LOG_NOTICE);
- }
- } else if (c == '\n') {
- *q++ = ' ';
- } else if (iscntrl(c) && (c < 0177)) {
+ while ((c = *p++)) {
+ if (c == '\n')
+ c = ' ';
+ if (!(c & ~0x1f)) {
*q++ = '^';
- *q++ = c ^ 0100;
- } else {
- *q++ = c;
+ c += '@'; /* ^@, ^A, ^B... */
}
- p++;
+ *q++ = c;
}
*q = '\0';
- p++;
/* Now log it */
- logMessage(pri, line);
+ timestamp_and_log(pri, PARSEBUF, q - PARSEBUF);
}
- return n_read;
}
-
-#ifdef CONFIG_FEATURE_REMOTE_LOG
-static void init_RemoteLog(void)
+static void quit_signal(int sig)
{
+ timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"syslogd exiting", 0);
+ puts("syslogd exiting");
+ if (ENABLE_FEATURE_IPC_SYSLOG)
+ ipcsyslog_cleanup();
+ exit(1);
+}
- struct sockaddr_in remoteaddr;
- struct hostent *hostinfo;
- int len = sizeof(remoteaddr);
-
- memset(&remoteaddr, 0, len);
-
- remotefd = socket(AF_INET, SOCK_DGRAM, 0);
-
- if (remotefd < 0) {
- error_msg_and_die("cannot create socket");
- }
-
- hostinfo = xgethostbyname(RemoteHost);
-
- remoteaddr.sin_family = AF_INET;
- remoteaddr.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
- remoteaddr.sin_port = htons(RemotePort);
-
- /* Since we are using UDP sockets, connect just sets the default host and port
- * for future operations
- */
- if (0 != (connect(remotefd, (struct sockaddr *) &remoteaddr, len))) {
- error_msg_and_die("cannot connect to remote host %s:%d", RemoteHost,
- RemotePort);
+#ifdef SYSLOGD_MARK
+static void do_mark(int sig)
+{
+ if (G.markInterval) {
+ timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"-- MARK --", 0);
+ alarm(G.markInterval);
}
-
}
#endif
-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;
+ char *dev_log_name;
- /* Set up signal handlers. */
+ /* Set up signal handlers */
signal(SIGINT, quit_signal);
signal(SIGTERM, quit_signal);
signal(SIGQUIT, quit_signal);
#ifdef SIGCLD
signal(SIGCLD, SIG_IGN);
#endif
- signal(SIGALRM, domark);
- alarm(MarkInterval);
-
- /* Create the syslog file so realpath() can work. */
- if (realpath(_PATH_LOG, lfile) != NULL) {
- unlink(lfile);
- }
+#ifdef SYSLOGD_MARK
+ signal(SIGALRM, do_mark);
+ alarm(G.markInterval);
+#endif
memset(&sunx, 0, sizeof(sunx));
sunx.sun_family = AF_UNIX;
- strncpy(sunx.sun_path, lfile, sizeof(sunx.sun_path));
- if ((sock_fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) {
- perror_msg_and_die("Couldn't get file descriptor for socket "
- _PATH_LOG);
+ strcpy(sunx.sun_path, "/dev/log");
+
+ /* Unlink old /dev/log or object it points to. */
+ /* (if it exists, bind will fail) */
+ logmode = LOGMODE_NONE;
+ dev_log_name = xmalloc_readlink_or_warn("/dev/log");
+ logmode = LOGMODE_STDIO;
+ if (dev_log_name) {
+ int fd = xopen(".", O_NONBLOCK);
+ xchdir("/dev");
+ /* we do not check whether this is a link also */
+ unlink(dev_log_name);
+ fchdir(fd);
+ close(fd);
+ safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
+ free(dev_log_name);
+ } else {
+ unlink("/dev/log");
}
- addrLength = sizeof(sunx.sun_family) + strlen(sunx.sun_path);
- if (bind(sock_fd, (struct sockaddr *) &sunx, addrLength) < 0) {
- perror_msg_and_die("Could not connect to socket " _PATH_LOG);
- }
+ sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
+ xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
- if (chmod(lfile, 0666) < 0) {
- perror_msg_and_die("Could not set permission on " _PATH_LOG);
+ if (chmod("/dev/log", 0666) < 0) {
+ bb_perror_msg_and_die("cannot set permission on /dev/log");
}
-#ifdef CONFIG_FEATURE_IPC_SYSLOG
- if (circular_logging == TRUE) {
+ if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) {
ipcsyslog_init();
}
-#endif
-
-#ifdef CONFIG_FEATURE_REMOTE_LOG
- if (doRemoteLog == TRUE) {
- init_RemoteLog();
- }
-#endif
- logMessage(LOG_SYSLOG | LOG_INFO, "syslogd started: " BB_BANNER);
+ timestamp_and_log(LOG_SYSLOG | LOG_INFO,
+ (char*)"syslogd started: BusyBox v" BB_VER, 0);
for (;;) {
-
FD_ZERO(&fds);
FD_SET(sock_fd, &fds);
if (select(sock_fd + 1, &fds, NULL, NULL, NULL) < 0) {
if (errno == EINTR) {
- /* alarm may have happened. */
+ /* alarm may have happened */
continue;
}
- perror_msg_and_die("select error");
+ bb_perror_msg_and_die("select");
}
if (FD_ISSET(sock_fd, &fds)) {
int i;
-
- RESERVE_CONFIG_BUFFER(tmpbuf, BUFSIZ + 1);
-
- memset(tmpbuf, '\0', BUFSIZ + 1);
- if ((i = recv(sock_fd, tmpbuf, BUFSIZ, 0)) > 0) {
- serveConnection(tmpbuf, i);
- } else {
- perror_msg_and_die("UNIX socket error");
+ i = recv(sock_fd, RECVBUF, MAX_READ - 1, 0);
+ if (i <= 0)
+ bb_perror_msg_and_die("UNIX socket error");
+ /* TODO: maybe suppress 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 (G.remoteAddr) {
+ if (-1 == G.remoteFD) {
+ G.remoteFD = socket(G.remoteAddr->sa.sa_family, SOCK_DGRAM, 0);
+ }
+ if (-1 != G.remoteFD) {
+ /* send message to remote logger, ignore possible error */
+ sendto(G.remoteFD, RECVBUF, i, MSG_DONTWAIT,
+ &G.remoteAddr->sa, G.remoteAddr->len);
+ }
}
- RELEASE_CONFIG_BUFFER(tmpbuf);
- } /* FD_ISSET() */
- } /* for main loop */
+#endif
+ RECVBUF[i] = '\0';
+ split_escape_and_log(RECVBUF, i);
+ } /* FD_ISSET() */
+ } /* for */
}
-extern int syslogd_main(int argc, char **argv)
+int syslogd_main(int argc, char **argv);
+int syslogd_main(int argc, char **argv)
{
- int opt;
-
-#if ! defined(__uClinux__)
- int doFork = TRUE;
-#endif
-
+ char OPTION_DECL;
char *p;
+ PTR_TO_GLOBALS = xzalloc(sizeof(G));
+ memcpy(ptr_to_globals, &init_globals, sizeof(init_globals));
+
/* do normal option parsing */
- while ((opt = getopt(argc, argv, "m:nO:R:LC")) > 0) {
- switch (opt) {
- case 'm':
- MarkInterval = atoi(optarg) * 60;
- break;
-#if ! defined(__uClinux__)
- case 'n':
- doFork = FALSE;
- break;
+ opt_complementary = "=0"; /* no non-option params */
+ getopt32(argc, argv, OPTION_STR, OPTION_PARAM);
+#ifdef SYSLOGD_MARK
+ if (option_mask32 & OPT_mark) // -m
+ G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
#endif
- case 'O':
- logFilePath = xstrdup(optarg);
- break;
-#ifdef CONFIG_FEATURE_REMOTE_LOG
- case 'R':
- RemoteHost = xstrdup(optarg);
- if ((p = strchr(RemoteHost, ':'))) {
- RemotePort = atoi(p + 1);
- *p = '\0';
- }
- doRemoteLog = TRUE;
- break;
- case 'L':
- local_logging = TRUE;
- break;
-#endif
-#ifdef CONFIG_FEATURE_IPC_SYSLOG
- case 'C':
- circular_logging = TRUE;
- break;
+ //if (option_mask32 & OPT_nofork) // -n
+ //if (option_mask32 & OPT_outfile) // -O
+ if (option_mask32 & OPT_loglevel) // -l
+ G.logLevel = xatou_range(opt_l, 1, 8);
+ //if (option_mask32 & OPT_small) // -S
+#if ENABLE_FEATURE_ROTATE_LOGFILE
+ if (option_mask32 & OPT_filesize) // -s
+ G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
+ if (option_mask32 & OPT_rotatecnt) // -b
+ G.logFileRotate = xatou_range(opt_b, 0, 99);
#endif
- default:
- show_usage();
- }
+#if ENABLE_FEATURE_REMOTE_LOG
+ if (option_mask32 & OPT_remotelog) { // -R
+ G.remoteAddr = xhost2sockaddr(opt_R, 514);
}
-
-#ifdef CONFIG_FEATURE_REMOTE_LOG
- /* If they have not specified remote logging, then log locally */
- if (doRemoteLog == FALSE)
- local_logging = TRUE;
+ //if (option_mask32 & OPT_locallog) // -L
+#endif
+#if ENABLE_FEATURE_IPC_SYSLOG
+ 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))
+ option_mask32 |= OPT_locallog;
/* Store away localhost's name before the fork */
- gethostname(LocalHostName, sizeof(LocalHostName));
- if ((p = strchr(LocalHostName, '.'))) {
- *p++ = '\0';
+ gethostname(G.localHostName, sizeof(G.localHostName));
+ p = strchr(G.localHostName, '.');
+ if (p) {
+ *p = '\0';
}
- umask(0);
-
-#if ! defined(__uClinux__)
- if ((doFork == TRUE) && (daemon(0, 1) < 0)) {
- perror_msg_and_die("daemon");
- }
+ if (!(option_mask32 & OPT_nofork)) {
+#ifdef BB_NOMMU
+ vfork_daemon_rexec(0, 1, argc, argv, "-n");
+#else
+ bb_daemonize();
#endif
- doSyslogd();
-
- return EXIT_SUCCESS;
+ }
+ umask(0);
+ do_syslogd();
+ /* return EXIT_SUCCESS; */
}
-
-/*
-Local Variables
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
projects / oweals / busybox.git / blobdiff