mirror of
https://github.com/sheumann/hush.git
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(add/remove: 0/0 grow/shrink: 12/131 up/down: 91/-727) Total: -636 bytes text data bss dec hex filename 773469 1058 11092 785619 bfcd3 busybox_old 772644 1058 11092 784794 bf99a busybox_unstripped
622 lines
16 KiB
C
622 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 "libbb.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 prioritynames[] and facilitynames[]
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* from syslog.h. Grrrr - glibc puts those in _rwdata_! :( */
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#define SYSLOG_NAMES
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#define SYSLOG_NAMES_CONST /* uclibc is saner :) */
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#include <sys/syslog.h>
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#include <sys/uio.h>
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#if ENABLE_FEATURE_REMOTE_LOG
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#include <netinet/in.h>
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#endif
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#if ENABLE_FEATURE_IPC_SYSLOG
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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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#endif
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#define DEBUG 0
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/* MARK code 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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#undef SYSLOGD_MARK
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enum { MAX_READ = 256 };
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/* Semaphore operation structures */
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struct shbuf_ds {
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int32_t size; /* size of data - 1 */
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int32_t tail; /* end of message list */
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char data[1]; /* data/messages */
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};
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/* Allows us to have smaller initializer. Ugly. */
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#define GLOBALS \
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const char *logFilePath; \
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int logFD; \
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/* interval between marks in seconds */ \
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/*int markInterval;*/ \
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/* level of messages to be logged */ \
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int logLevel; \
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USE_FEATURE_ROTATE_LOGFILE( \
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/* max size of file before rotation */ \
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unsigned logFileSize; \
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/* number of rotated message files */ \
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unsigned logFileRotate; \
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unsigned curFileSize; \
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smallint isRegular; \
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) \
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USE_FEATURE_REMOTE_LOG( \
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/* udp socket for remote logging */ \
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int remoteFD; \
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len_and_sockaddr* remoteAddr; \
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) \
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USE_FEATURE_IPC_SYSLOG( \
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int shmid; /* ipc shared memory id */ \
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int s_semid; /* ipc semaphore id */ \
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int shm_size; \
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struct sembuf SMwup[1]; \
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struct sembuf SMwdn[3]; \
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)
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struct init_globals {
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GLOBALS
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};
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struct globals {
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GLOBALS
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#if ENABLE_FEATURE_IPC_SYSLOG
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struct shbuf_ds *shbuf;
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#endif
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time_t last_log_time;
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/* localhost's name */
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char localHostName[64];
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/* We recv into recvbuf... */
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char recvbuf[MAX_READ];
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/* ...then copy to parsebuf, escaping control chars */
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/* (can grow x2 max) */
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char parsebuf[MAX_READ*2];
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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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char printbuf[MAX_READ*2 + 128];
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};
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static const struct init_globals init_data = {
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.logFilePath = "/var/log/messages",
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.logFD = -1,
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#ifdef SYSLOGD_MARK
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.markInterval = 20 * 60,
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#endif
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.logLevel = 8,
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#if ENABLE_FEATURE_ROTATE_LOGFILE
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.logFileSize = 200 * 1024,
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.logFileRotate = 1,
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#endif
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#if ENABLE_FEATURE_REMOTE_LOG
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.remoteFD = -1,
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#endif
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#if ENABLE_FEATURE_IPC_SYSLOG
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.shmid = -1,
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.s_semid = -1,
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.shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), // default shm size
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.SMwup = { {1, -1, IPC_NOWAIT} },
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.SMwdn = { {0, 0}, {1, 0}, {1, +1} },
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#endif
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};
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#define G (*ptr_to_globals)
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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, &G.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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/* our shared key */
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#define KEY_ID ((long)0x414e4547) /* "GENA" */
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static void ipcsyslog_cleanup(void)
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{
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if (G.shmid != -1) {
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shmdt(G.shbuf);
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}
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if (G.shmid != -1) {
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shmctl(G.shmid, IPC_RMID, NULL);
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}
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if (G.s_semid != -1) {
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semctl(G.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, G.shm_size);
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G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644);
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if (G.shmid == -1) {
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bb_perror_msg_and_die("shmget");
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}
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G.shbuf = shmat(G.shmid, NULL, 0);
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if (!G.shbuf) {
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bb_perror_msg_and_die("shmat");
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}
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memset(G.shbuf, 0, G.shm_size);
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G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data) - 1;
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/*G.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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G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
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if (G.s_semid == -1) {
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if (errno == EEXIST) {
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G.s_semid = semget(KEY_ID, 2, 0);
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if (G.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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int old_tail, new_tail;
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if (semop(G.s_semid, G.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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* tail's max value is (shbuf->size - 1)
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* Last byte of buffer is never used and remains NUL.
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*/
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len++; /* length with NUL included */
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again:
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old_tail = G.shbuf->tail;
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new_tail = old_tail + len;
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if (new_tail < G.shbuf->size) {
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/* store message, set new tail */
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memcpy(G.shbuf->data + old_tail, msg, len);
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G.shbuf->tail = new_tail;
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} else {
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/* k == available buffer space ahead of old tail */
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int k = G.shbuf->size - old_tail;
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/* copy what fits to the end of buffer, and repeat */
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memcpy(G.shbuf->data + old_tail, msg, k);
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msg += k;
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len -= k;
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G.shbuf->tail = 0;
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goto again;
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}
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if (semop(G.s_semid, G.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("tail:%d\n", G.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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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) && G.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 (G.logFD >= 0) {
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time_t cur;
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time(&cur);
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if (G.last_log_time != cur) {
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G.last_log_time = cur; /* reopen log file every second */
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close(G.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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G.logFD = device_open(G.logFilePath, O_WRONLY | O_CREAT
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| O_NOCTTY | O_APPEND | O_NONBLOCK);
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if (G.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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G.isRegular = (fstat(G.logFD, &statf) == 0 && S_ISREG(statf.st_mode));
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/* bug (mostly harmless): can wrap around if file > 4gb */
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G.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(G.logFD, F_SETLKW, &fl);
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#if ENABLE_FEATURE_ROTATE_LOGFILE
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if (G.logFileSize && G.isRegular && G.curFileSize > G.logFileSize) {
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if (G.logFileRotate) { /* always 0..99 */
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int i = strlen(G.logFilePath) + 3 + 1;
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char oldFile[i];
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char newFile[i];
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i = G.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", G.logFilePath, i);
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if (i == 0) break;
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sprintf(oldFile, "%s.%d", G.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(G.logFilePath, newFile);
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fl.l_type = F_UNLCK;
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fcntl(G.logFD, F_SETLKW, &fl);
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close(G.logFD);
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goto reopen;
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}
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ftruncate(G.logFD, 0);
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}
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G.curFileSize +=
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#endif
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full_write(G.logFD, msg, len);
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fl.l_type = F_UNLCK;
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fcntl(G.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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const 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) < G.logLevel) {
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if (option_mask32 & OPT_small)
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sprintf(G.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(G.printbuf, "%s %s %s %s\n", timestamp, G.localHostName, res, msg);
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}
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log_locally(G.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 = G.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) && c != '\t') {
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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, G.parsebuf, q - G.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 (G.markInterval) {
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timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"-- MARK --", 0);
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alarm(G.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);
|
|
signal(SIGQUIT, quit_signal);
|
|
signal(SIGHUP, SIG_IGN);
|
|
signal(SIGCHLD, SIG_IGN);
|
|
#ifdef SIGCLD
|
|
signal(SIGCLD, SIG_IGN);
|
|
#endif
|
|
#ifdef SYSLOGD_MARK
|
|
signal(SIGALRM, do_mark);
|
|
alarm(G.markInterval);
|
|
#endif
|
|
remove_pidfile("/var/run/syslogd.pid");
|
|
|
|
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, G.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, G.recvbuf, i, MSG_DONTWAIT,
|
|
&G.remoteAddr->sa, G.remoteAddr->len);
|
|
}
|
|
}
|
|
#endif
|
|
G.recvbuf[i] = '\0';
|
|
split_escape_and_log(G.recvbuf, i);
|
|
} /* FD_ISSET() */
|
|
} /* for */
|
|
}
|
|
|
|
int syslogd_main(int argc, char **argv);
|
|
int syslogd_main(int argc, char **argv)
|
|
{
|
|
char OPTION_DECL;
|
|
char *p;
|
|
|
|
PTR_TO_GLOBALS = memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data));
|
|
|
|
/* do normal option parsing */
|
|
opt_complementary = "=0"; /* no non-option params */
|
|
getopt32(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
|
|
//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
|
|
#if ENABLE_FEATURE_REMOTE_LOG
|
|
if (option_mask32 & OPT_remotelog) { // -R
|
|
G.remoteAddr = xhost2sockaddr(opt_R, 514);
|
|
}
|
|
//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(G.localHostName, sizeof(G.localHostName));
|
|
p = strchr(G.localHostName, '.');
|
|
if (p) {
|
|
*p = '\0';
|
|
}
|
|
|
|
if (!(option_mask32 & OPT_nofork)) {
|
|
bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
|
|
}
|
|
umask(0);
|
|
write_pidfile("/var/run/syslogd.pid");
|
|
do_syslogd();
|
|
/* return EXIT_SUCCESS; */
|
|
}
|