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618 lines
16 KiB
C
618 lines
16 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini syslogd implementation for busybox
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
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*
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* "circular buffer" Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>
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*
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* Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#include "busybox.h"
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#include <paths.h>
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#include <sys/un.h>
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/* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
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#define SYSLOG_NAMES
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#include <sys/syslog.h>
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#include <sys/uio.h>
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#define DEBUG 0
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/* Path for the file where all log messages are written */
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static const char *logFilePath = "/var/log/messages";
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static int logFD = -1;
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/* This is not very useful, is bloat, and broken:
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* can deadlock if alarmed to make MARK while writing to IPC buffer
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* (semaphores are down but do_mark routine tries to down them again) */
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#ifdef SYSLOGD_MARK
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/* interval between marks in seconds */
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static int markInterval = 20 * 60;
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#endif
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/* level of messages to be locally logged */
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static int logLevel = 8;
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/* localhost's name */
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static char localHostName[64];
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#if ENABLE_FEATURE_ROTATE_LOGFILE
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/* max size of message file before being rotated */
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static unsigned logFileSize = 200 * 1024;
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/* number of rotated message files */
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static unsigned logFileRotate = 1;
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static unsigned curFileSize;
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static smallint isRegular;
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#endif
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#if ENABLE_FEATURE_REMOTE_LOG
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#include <netinet/in.h>
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/* udp socket for logging to remote host */
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static int remoteFD = -1;
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static len_and_sockaddr* remoteAddr;
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#endif
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/* We are using bb_common_bufsiz1 for buffering: */
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enum { MAX_READ = (BUFSIZ/6) & ~0xf };
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/* We recv into RECVBUF... (size: MAX_READ ~== BUFSIZ/6) */
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#define RECVBUF bb_common_bufsiz1
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/* ...then copy to PARSEBUF, escaping control chars */
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/* (can grow x2 max ~== BUFSIZ/3) */
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#define PARSEBUF (bb_common_bufsiz1 + MAX_READ)
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/* ...then sprintf into PRINTBUF, adding timestamp (15 chars),
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* host (64), fac.prio (20) to the message */
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/* (growth by: 15 + 64 + 20 + delims = ~110) */
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#define PRINTBUF (bb_common_bufsiz1 + 3*MAX_READ)
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/* totals: BUFSIZ == BUFSIZ/6 + BUFSIZ/3 + (BUFSIZ/3+BUFSIZ/6)
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* -- we have BUFSIZ/6 extra at the ent of PRINTBUF
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* which covers needed ~110 extra bytes (and much more) */
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/* Options */
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enum {
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OPTBIT_mark = 0, // -m
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OPTBIT_nofork, // -n
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OPTBIT_outfile, // -O
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OPTBIT_loglevel, // -l
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OPTBIT_small, // -S
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USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s
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USE_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b
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USE_FEATURE_REMOTE_LOG( OPTBIT_remote ,) // -R
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USE_FEATURE_REMOTE_LOG( OPTBIT_localtoo ,) // -L
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USE_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C
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OPT_mark = 1 << OPTBIT_mark ,
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OPT_nofork = 1 << OPTBIT_nofork ,
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OPT_outfile = 1 << OPTBIT_outfile ,
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OPT_loglevel = 1 << OPTBIT_loglevel,
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OPT_small = 1 << OPTBIT_small ,
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OPT_filesize = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0,
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OPT_rotatecnt = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 0,
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OPT_remotelog = USE_FEATURE_REMOTE_LOG( (1 << OPTBIT_remote )) + 0,
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OPT_locallog = USE_FEATURE_REMOTE_LOG( (1 << OPTBIT_localtoo )) + 0,
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OPT_circularlog = USE_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0,
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};
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#define OPTION_STR "m:nO:l:S" \
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USE_FEATURE_ROTATE_LOGFILE("s:" ) \
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USE_FEATURE_ROTATE_LOGFILE("b:" ) \
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USE_FEATURE_REMOTE_LOG( "R:" ) \
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USE_FEATURE_REMOTE_LOG( "L" ) \
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USE_FEATURE_IPC_SYSLOG( "C::")
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#define OPTION_DECL *opt_m, *opt_l \
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USE_FEATURE_ROTATE_LOGFILE(,*opt_s) \
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USE_FEATURE_ROTATE_LOGFILE(,*opt_b) \
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USE_FEATURE_REMOTE_LOG( ,*opt_R) \
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USE_FEATURE_IPC_SYSLOG( ,*opt_C = NULL)
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#define OPTION_PARAM &opt_m, &logFilePath, &opt_l \
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USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \
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USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \
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USE_FEATURE_REMOTE_LOG( ,&opt_R) \
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USE_FEATURE_IPC_SYSLOG( ,&opt_C)
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/* circular buffer variables/structures */
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#if ENABLE_FEATURE_IPC_SYSLOG
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#if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
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#error Sorry, you must set the syslogd buffer size to at least 4KB.
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#error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
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#endif
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#include <sys/ipc.h>
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#include <sys/sem.h>
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#include <sys/shm.h>
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/* our shared key */
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#define KEY_ID ((long)0x414e4547) /* "GENA" */
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// Semaphore operation structures
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static struct shbuf_ds {
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int32_t size; // size of data written
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int32_t head; // start of message list
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int32_t tail; // end of message list
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char data[1]; // data/messages
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} *shbuf; // shared memory pointer
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static int shmid = -1; // ipc shared memory id
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static int s_semid = -1; // ipc semaphore id
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static int shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024); // default shm size
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static void ipcsyslog_cleanup(void)
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{
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if (shmid != -1) {
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shmdt(shbuf);
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}
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if (shmid != -1) {
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shmctl(shmid, IPC_RMID, NULL);
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}
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if (s_semid != -1) {
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semctl(s_semid, 0, IPC_RMID, 0);
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}
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}
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static void ipcsyslog_init(void)
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{
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if (DEBUG)
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printf("shmget(%lx, %d,...)\n", KEY_ID, shm_size);
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shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023);
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if (shmid == -1) {
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bb_perror_msg_and_die("shmget");
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}
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shbuf = shmat(shmid, NULL, 0);
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if (!shbuf) {
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bb_perror_msg_and_die("shmat");
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}
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shbuf->size = shm_size - offsetof(struct shbuf_ds, data);
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shbuf->head = shbuf->tail = 0;
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// we'll trust the OS to set initial semval to 0 (let's hope)
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s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
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if (s_semid == -1) {
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if (errno == EEXIST) {
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s_semid = semget(KEY_ID, 2, 0);
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if (s_semid != -1)
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return;
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}
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bb_perror_msg_and_die("semget");
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}
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}
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/* Write message to shared mem buffer */
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static void log_to_shmem(const char *msg, int len)
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{
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/* Why libc insists on these being rw? */
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static struct sembuf SMwup[1] = { {1, -1, IPC_NOWAIT} };
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static struct sembuf SMwdn[3] = { {0, 0}, {1, 0}, {1, +1} };
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int old_tail, new_tail;
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char *c;
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if (semop(s_semid, SMwdn, 3) == -1) {
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bb_perror_msg_and_die("SMwdn");
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}
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/* Circular Buffer Algorithm:
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* --------------------------
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* tail == position where to store next syslog message.
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* head == position of next message to retrieve ("print").
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* if head == tail, there is no "unprinted" messages left.
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* head is typically advanced by separate "reader" program,
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* but if there isn't one, we have to do it ourself.
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* messages are NUL-separated.
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*/
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len++; /* length with NUL included */
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again:
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old_tail = shbuf->tail;
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new_tail = old_tail + len;
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if (new_tail < shbuf->size) {
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/* No need to move head if shbuf->head <= old_tail,
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* else... */
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if (old_tail < shbuf->head && shbuf->head <= new_tail) {
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/* ...need to move head forward */
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c = memchr(shbuf->data + new_tail, '\0',
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shbuf->size - new_tail);
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if (!c) /* no NUL ahead of us, wrap around */
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c = memchr(shbuf->data, '\0', old_tail);
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if (!c) { /* still nothing? point to this msg... */
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shbuf->head = old_tail;
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} else {
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/* convert pointer to offset + skip NUL */
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shbuf->head = c - shbuf->data + 1;
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}
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}
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/* store message, set new tail */
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memcpy(shbuf->data + old_tail, msg, len);
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shbuf->tail = new_tail;
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} else {
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/* we need to break up the message and wrap it around */
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/* k == available buffer space ahead of old tail */
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int k = shbuf->size - old_tail - 1;
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if (shbuf->head > old_tail) {
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/* we are going to overwrite head, need to
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* move it out of the way */
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c = memchr(shbuf->data, '\0', old_tail);
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if (!c) { /* nothing? point to this msg... */
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shbuf->head = old_tail;
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} else { /* convert pointer to offset + skip NUL */
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shbuf->head = c - shbuf->data + 1;
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}
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}
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/* copy what fits to the end of buffer, and repeat */
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memcpy(shbuf->data + old_tail, msg, k);
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msg += k;
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len -= k;
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shbuf->tail = 0;
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goto again;
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}
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if (semop(s_semid, SMwup, 1) == -1) {
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bb_perror_msg_and_die("SMwup");
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}
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if (DEBUG)
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printf("head:%d tail:%d\n", shbuf->head, shbuf->tail);
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}
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#else
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void ipcsyslog_cleanup(void);
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void ipcsyslog_init(void);
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void log_to_shmem(const char *msg);
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#endif /* FEATURE_IPC_SYSLOG */
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/* Print a message to the log file. */
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static void log_locally(char *msg)
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{
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static time_t last;
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struct flock fl;
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int len = strlen(msg);
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#if ENABLE_FEATURE_IPC_SYSLOG
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if ((option_mask32 & OPT_circularlog) && shbuf) {
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log_to_shmem(msg, len);
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return;
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}
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#endif
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if (logFD >= 0) {
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time_t cur;
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time(&cur);
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if (last != cur) {
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last = cur; /* reopen log file every second */
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close(logFD);
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goto reopen;
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}
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} else {
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reopen:
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logFD = device_open(logFilePath, O_WRONLY | O_CREAT
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| O_NOCTTY | O_APPEND | O_NONBLOCK);
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if (logFD < 0) {
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/* cannot open logfile? - print to /dev/console then */
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int fd = device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
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if (fd < 0)
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fd = 2; /* then stderr, dammit */
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full_write(fd, msg, len);
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if (fd != 2)
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close(fd);
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return;
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}
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#if ENABLE_FEATURE_ROTATE_LOGFILE
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{
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struct stat statf;
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isRegular = (fstat(logFD, &statf) == 0 && (statf.st_mode & S_IFREG));
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/* bug (mostly harmless): can wrap around if file > 4gb */
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curFileSize = statf.st_size;
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}
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#endif
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}
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fl.l_whence = SEEK_SET;
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fl.l_start = 0;
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fl.l_len = 1;
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fl.l_type = F_WRLCK;
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fcntl(logFD, F_SETLKW, &fl);
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#if ENABLE_FEATURE_ROTATE_LOGFILE
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if (logFileSize && isRegular && curFileSize > logFileSize) {
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if (logFileRotate) { /* always 0..99 */
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int i = strlen(logFilePath) + 3 + 1;
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char oldFile[i];
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char newFile[i];
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i = logFileRotate - 1;
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/* rename: f.8 -> f.9; f.7 -> f.8; ... */
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while (1) {
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sprintf(newFile, "%s.%d", logFilePath, i);
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if (i == 0) break;
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sprintf(oldFile, "%s.%d", logFilePath, --i);
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rename(oldFile, newFile);
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}
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/* newFile == "f.0" now */
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rename(logFilePath, newFile);
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fl.l_type = F_UNLCK;
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fcntl(logFD, F_SETLKW, &fl);
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close(logFD);
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goto reopen;
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}
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ftruncate(logFD, 0);
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}
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curFileSize +=
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#endif
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full_write(logFD, msg, len);
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fl.l_type = F_UNLCK;
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fcntl(logFD, F_SETLKW, &fl);
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}
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static void parse_fac_prio_20(int pri, char *res20)
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{
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CODE *c_pri, *c_fac;
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if (pri != 0) {
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c_fac = facilitynames;
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while (c_fac->c_name) {
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if (c_fac->c_val != (LOG_FAC(pri) << 3)) {
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c_fac++; continue;
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}
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/* facility is found, look for prio */
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c_pri = prioritynames;
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while (c_pri->c_name) {
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if (c_pri->c_val != LOG_PRI(pri)) {
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c_pri++; continue;
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}
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snprintf(res20, 20, "%s.%s",
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c_fac->c_name, c_pri->c_name);
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return;
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}
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/* prio not found, bail out */
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break;
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}
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snprintf(res20, 20, "<%d>", pri);
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}
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}
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/* len parameter is used only for "is there a timestamp?" check.
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* NB: some callers cheat and supply 0 when they know
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* that there is no timestamp, short-cutting the test. */
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static void timestamp_and_log(int pri, char *msg, int len)
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{
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char *timestamp;
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if (len < 16 || msg[3] != ' ' || msg[6] != ' '
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|| msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
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) {
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time_t now;
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time(&now);
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timestamp = ctime(&now) + 4;
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} else {
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timestamp = msg;
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msg += 16;
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}
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timestamp[15] = '\0';
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/* Log message locally (to file or shared mem) */
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if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
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if (LOG_PRI(pri) < logLevel) {
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if (option_mask32 & OPT_small)
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sprintf(PRINTBUF, "%s %s\n", timestamp, msg);
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else {
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char res[20];
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parse_fac_prio_20(pri, res);
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sprintf(PRINTBUF, "%s %s %s %s\n", timestamp, localHostName, res, msg);
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}
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log_locally(PRINTBUF);
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}
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}
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}
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static void split_escape_and_log(char *tmpbuf, int len)
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{
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char *p = tmpbuf;
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tmpbuf += len;
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while (p < tmpbuf) {
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char c;
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char *q = PARSEBUF;
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int pri = (LOG_USER | LOG_NOTICE);
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if (*p == '<') {
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/* Parse the magic priority number */
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pri = bb_strtou(p + 1, &p, 10);
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if (*p == '>') p++;
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if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) {
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pri = (LOG_USER | LOG_NOTICE);
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}
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}
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while ((c = *p++)) {
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if (c == '\n')
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c = ' ';
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if (!(c & ~0x1f)) {
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*q++ = '^';
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c += '@'; /* ^@, ^A, ^B... */
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}
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*q++ = c;
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}
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*q = '\0';
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/* Now log it */
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timestamp_and_log(pri, PARSEBUF, q - PARSEBUF);
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}
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}
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static void quit_signal(int sig)
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{
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timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"syslogd exiting", 0);
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puts("syslogd exiting");
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if (ENABLE_FEATURE_IPC_SYSLOG)
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ipcsyslog_cleanup();
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exit(1);
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}
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#ifdef SYSLOGD_MARK
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static void do_mark(int sig)
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{
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if (markInterval) {
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timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"-- MARK --", 0);
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alarm(markInterval);
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}
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}
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#endif
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static void do_syslogd(void) ATTRIBUTE_NORETURN;
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static void do_syslogd(void)
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{
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struct sockaddr_un sunx;
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int sock_fd;
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fd_set fds;
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char *dev_log_name;
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/* Set up signal handlers */
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signal(SIGINT, quit_signal);
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signal(SIGTERM, quit_signal);
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signal(SIGQUIT, quit_signal);
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signal(SIGHUP, SIG_IGN);
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signal(SIGCHLD, SIG_IGN);
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#ifdef SIGCLD
|
|
signal(SIGCLD, SIG_IGN);
|
|
#endif
|
|
#ifdef SYSLOGD_MARK
|
|
signal(SIGALRM, do_mark);
|
|
alarm(markInterval);
|
|
#endif
|
|
|
|
memset(&sunx, 0, sizeof(sunx));
|
|
sunx.sun_family = AF_UNIX;
|
|
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");
|
|
}
|
|
|
|
sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
|
|
xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
|
|
|
|
if (chmod("/dev/log", 0666) < 0) {
|
|
bb_perror_msg_and_die("cannot set permission on /dev/log");
|
|
}
|
|
if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) {
|
|
ipcsyslog_init();
|
|
}
|
|
|
|
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 */
|
|
continue;
|
|
}
|
|
bb_perror_msg_and_die("select");
|
|
}
|
|
|
|
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? */
|
|
#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 (remoteAddr) {
|
|
if (-1 == remoteFD) {
|
|
remoteFD = socket(remoteAddr->sa.sa_family, SOCK_DGRAM, 0);
|
|
}
|
|
if (-1 != remoteFD) {
|
|
/* send message to remote logger, ignore possible error */
|
|
sendto(remoteFD, RECVBUF, i, MSG_DONTWAIT,
|
|
&remoteAddr->sa, remoteAddr->len);
|
|
}
|
|
}
|
|
#endif
|
|
RECVBUF[i] = '\0';
|
|
split_escape_and_log(RECVBUF, i);
|
|
} /* FD_ISSET() */
|
|
} /* for */
|
|
}
|
|
|
|
int syslogd_main(int argc, char **argv);
|
|
int syslogd_main(int argc, char **argv)
|
|
{
|
|
char OPTION_DECL;
|
|
char *p;
|
|
|
|
/* do normal option parsing */
|
|
opt_complementary = "=0"; /* no non-option params */
|
|
getopt32(argc, argv, OPTION_STR, OPTION_PARAM);
|
|
#ifdef SYSLOGD_MARK
|
|
if (option_mask32 & OPT_mark) // -m
|
|
markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
|
|
#endif
|
|
//if (option_mask32 & OPT_nofork) // -n
|
|
//if (option_mask32 & OPT_outfile) // -O
|
|
if (option_mask32 & OPT_loglevel) // -l
|
|
logLevel = xatou_range(opt_l, 1, 8);
|
|
//if (option_mask32 & OPT_small) // -S
|
|
#if ENABLE_FEATURE_ROTATE_LOGFILE
|
|
if (option_mask32 & OPT_filesize) // -s
|
|
logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
|
|
if (option_mask32 & OPT_rotatecnt) // -b
|
|
logFileRotate = xatou_range(opt_b, 0, 99);
|
|
#endif
|
|
#if ENABLE_FEATURE_REMOTE_LOG
|
|
if (option_mask32 & OPT_remotelog) { // -R
|
|
remoteAddr = xhost2sockaddr(opt_R, 514);
|
|
}
|
|
//if (option_mask32 & OPT_locallog) // -L
|
|
#endif
|
|
#if ENABLE_FEATURE_IPC_SYSLOG
|
|
if (opt_C) // -Cn
|
|
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));
|
|
p = strchr(localHostName, '.');
|
|
if (p) {
|
|
*p = '\0';
|
|
}
|
|
|
|
if (!(option_mask32 & OPT_nofork)) {
|
|
#ifdef BB_NOMMU
|
|
vfork_daemon_rexec(0, 1, argc, argv, "-n");
|
|
#else
|
|
bb_daemonize();
|
|
#endif
|
|
}
|
|
umask(0);
|
|
do_syslogd();
|
|
/* return EXIT_SUCCESS; */
|
|
}
|