[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini syslogd implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
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| 8 | *
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| 9 | * "circular buffer" Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>
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| 10 | *
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| 11 | * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
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| 12 | *
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| 13 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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| 14 | */
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| 15 |
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[1770] | 16 | #include "libbb.h"
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[821] | 17 | #include <paths.h>
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| 18 | #include <sys/un.h>
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| 19 |
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[1770] | 20 | /* SYSLOG_NAMES defined to pull prioritynames[] and facilitynames[]
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| 21 | * from syslog.h. Grrrr - glibc puts those in _rwdata_! :( */
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[821] | 22 | #define SYSLOG_NAMES
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[1770] | 23 | #define SYSLOG_NAMES_CONST /* uclibc is saner :) */
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[821] | 24 | #include <sys/syslog.h>
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| 25 | #include <sys/uio.h>
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| 26 |
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[1770] | 27 | #if ENABLE_FEATURE_REMOTE_LOG
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| 28 | #include <netinet/in.h>
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| 29 | #endif
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[821] | 30 |
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[1770] | 31 | #if ENABLE_FEATURE_IPC_SYSLOG
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| 32 | #include <sys/ipc.h>
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| 33 | #include <sys/sem.h>
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| 34 | #include <sys/shm.h>
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| 35 | #endif
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[821] | 36 |
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| 37 |
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[1770] | 38 | #define DEBUG 0
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[821] | 39 |
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[1770] | 40 | /* MARK code is not very useful, is bloat, and broken:
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| 41 | * can deadlock if alarmed to make MARK while writing to IPC buffer
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| 42 | * (semaphores are down but do_mark routine tries to down them again) */
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| 43 | #undef SYSLOGD_MARK
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[821] | 44 |
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[1770] | 45 | enum { MAX_READ = 256 };
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[821] | 46 |
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[1770] | 47 | /* Semaphore operation structures */
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| 48 | struct shbuf_ds {
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| 49 | int32_t size; /* size of data - 1 */
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| 50 | int32_t tail; /* end of message list */
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| 51 | char data[1]; /* data/messages */
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| 52 | };
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[821] | 53 |
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[1770] | 54 | /* Allows us to have smaller initializer. Ugly. */
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| 55 | #define GLOBALS \
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| 56 | const char *logFilePath; \
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| 57 | int logFD; \
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| 58 | /* interval between marks in seconds */ \
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| 59 | /*int markInterval;*/ \
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| 60 | /* level of messages to be logged */ \
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| 61 | int logLevel; \
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| 62 | USE_FEATURE_ROTATE_LOGFILE( \
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| 63 | /* max size of file before rotation */ \
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| 64 | unsigned logFileSize; \
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| 65 | /* number of rotated message files */ \
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| 66 | unsigned logFileRotate; \
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| 67 | unsigned curFileSize; \
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| 68 | smallint isRegular; \
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| 69 | ) \
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| 70 | USE_FEATURE_REMOTE_LOG( \
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| 71 | /* udp socket for remote logging */ \
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| 72 | int remoteFD; \
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| 73 | len_and_sockaddr* remoteAddr; \
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| 74 | ) \
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| 75 | USE_FEATURE_IPC_SYSLOG( \
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| 76 | int shmid; /* ipc shared memory id */ \
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| 77 | int s_semid; /* ipc semaphore id */ \
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| 78 | int shm_size; \
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| 79 | struct sembuf SMwup[1]; \
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| 80 | struct sembuf SMwdn[3]; \
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| 81 | )
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[821] | 82 |
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[1770] | 83 | struct init_globals {
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| 84 | GLOBALS
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| 85 | };
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[821] | 86 |
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[1770] | 87 | struct globals {
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| 88 | GLOBALS
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| 89 | #if ENABLE_FEATURE_IPC_SYSLOG
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| 90 | struct shbuf_ds *shbuf;
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| 91 | #endif
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| 92 | time_t last_log_time;
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| 93 | /* localhost's name */
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| 94 | char localHostName[64];
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[821] | 95 |
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[1770] | 96 | /* We recv into recvbuf... */
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| 97 | char recvbuf[MAX_READ];
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| 98 | /* ...then copy to parsebuf, escaping control chars */
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| 99 | /* (can grow x2 max) */
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| 100 | char parsebuf[MAX_READ*2];
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| 101 | /* ...then sprintf into printbuf, adding timestamp (15 chars),
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| 102 | * host (64), fac.prio (20) to the message */
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| 103 | /* (growth by: 15 + 64 + 20 + delims = ~110) */
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| 104 | char printbuf[MAX_READ*2 + 128];
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| 105 | };
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| 106 |
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| 107 | static const struct init_globals init_data = {
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| 108 | .logFilePath = "/var/log/messages",
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| 109 | .logFD = -1,
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| 110 | #ifdef SYSLOGD_MARK
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| 111 | .markInterval = 20 * 60,
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[821] | 112 | #endif
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[1770] | 113 | .logLevel = 8,
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| 114 | #if ENABLE_FEATURE_ROTATE_LOGFILE
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| 115 | .logFileSize = 200 * 1024,
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| 116 | .logFileRotate = 1,
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| 117 | #endif
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| 118 | #if ENABLE_FEATURE_REMOTE_LOG
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| 119 | .remoteFD = -1,
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| 120 | #endif
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| 121 | #if ENABLE_FEATURE_IPC_SYSLOG
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| 122 | .shmid = -1,
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| 123 | .s_semid = -1,
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| 124 | .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), // default shm size
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| 125 | .SMwup = { {1, -1, IPC_NOWAIT} },
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| 126 | .SMwdn = { {0, 0}, {1, 0}, {1, +1} },
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| 127 | #endif
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| 128 | };
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[821] | 129 |
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[1770] | 130 | #define G (*ptr_to_globals)
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[821] | 131 |
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| 132 |
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[1770] | 133 | /* Options */
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| 134 | enum {
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| 135 | OPTBIT_mark = 0, // -m
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| 136 | OPTBIT_nofork, // -n
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| 137 | OPTBIT_outfile, // -O
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| 138 | OPTBIT_loglevel, // -l
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| 139 | OPTBIT_small, // -S
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| 140 | USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s
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| 141 | USE_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b
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| 142 | USE_FEATURE_REMOTE_LOG( OPTBIT_remote ,) // -R
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| 143 | USE_FEATURE_REMOTE_LOG( OPTBIT_localtoo ,) // -L
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| 144 | USE_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C
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[821] | 145 |
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[1770] | 146 | OPT_mark = 1 << OPTBIT_mark ,
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| 147 | OPT_nofork = 1 << OPTBIT_nofork ,
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| 148 | OPT_outfile = 1 << OPTBIT_outfile ,
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| 149 | OPT_loglevel = 1 << OPTBIT_loglevel,
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| 150 | OPT_small = 1 << OPTBIT_small ,
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| 151 | OPT_filesize = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0,
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| 152 | OPT_rotatecnt = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 0,
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| 153 | OPT_remotelog = USE_FEATURE_REMOTE_LOG( (1 << OPTBIT_remote )) + 0,
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| 154 | OPT_locallog = USE_FEATURE_REMOTE_LOG( (1 << OPTBIT_localtoo )) + 0,
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| 155 | OPT_circularlog = USE_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0,
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| 156 | };
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| 157 | #define OPTION_STR "m:nO:l:S" \
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| 158 | USE_FEATURE_ROTATE_LOGFILE("s:" ) \
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| 159 | USE_FEATURE_ROTATE_LOGFILE("b:" ) \
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| 160 | USE_FEATURE_REMOTE_LOG( "R:" ) \
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| 161 | USE_FEATURE_REMOTE_LOG( "L" ) \
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| 162 | USE_FEATURE_IPC_SYSLOG( "C::")
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| 163 | #define OPTION_DECL *opt_m, *opt_l \
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| 164 | USE_FEATURE_ROTATE_LOGFILE(,*opt_s) \
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| 165 | USE_FEATURE_ROTATE_LOGFILE(,*opt_b) \
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| 166 | USE_FEATURE_REMOTE_LOG( ,*opt_R) \
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| 167 | USE_FEATURE_IPC_SYSLOG( ,*opt_C = NULL)
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| 168 | #define OPTION_PARAM &opt_m, &G.logFilePath, &opt_l \
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| 169 | USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \
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| 170 | USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \
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| 171 | USE_FEATURE_REMOTE_LOG( ,&opt_R) \
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| 172 | USE_FEATURE_IPC_SYSLOG( ,&opt_C)
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[821] | 173 |
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[1770] | 174 |
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[821] | 175 | /* circular buffer variables/structures */
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[1770] | 176 | #if ENABLE_FEATURE_IPC_SYSLOG
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[821] | 177 |
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| 178 | #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
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| 179 | #error Sorry, you must set the syslogd buffer size to at least 4KB.
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| 180 | #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
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| 181 | #endif
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| 182 |
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| 183 | /* our shared key */
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[1770] | 184 | #define KEY_ID ((long)0x414e4547) /* "GENA" */
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[821] | 185 |
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| 186 | static void ipcsyslog_cleanup(void)
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| 187 | {
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[1770] | 188 | if (G.shmid != -1) {
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| 189 | shmdt(G.shbuf);
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[821] | 190 | }
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[1770] | 191 | if (G.shmid != -1) {
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| 192 | shmctl(G.shmid, IPC_RMID, NULL);
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[821] | 193 | }
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[1770] | 194 | if (G.s_semid != -1) {
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| 195 | semctl(G.s_semid, 0, IPC_RMID, 0);
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[821] | 196 | }
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| 197 | }
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| 198 |
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| 199 | static void ipcsyslog_init(void)
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| 200 | {
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[1770] | 201 | if (DEBUG)
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| 202 | printf("shmget(%lx, %d,...)\n", KEY_ID, G.shm_size);
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[821] | 203 |
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[1770] | 204 | G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644);
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| 205 | if (G.shmid == -1) {
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| 206 | bb_perror_msg_and_die("shmget");
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| 207 | }
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[821] | 208 |
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[1770] | 209 | G.shbuf = shmat(G.shmid, NULL, 0);
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| 210 | if (!G.shbuf) {
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| 211 | bb_perror_msg_and_die("shmat");
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| 212 | }
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[821] | 213 |
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[1770] | 214 | memset(G.shbuf, 0, G.shm_size);
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| 215 | G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data) - 1;
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| 216 | /*G.shbuf->tail = 0;*/
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| 217 |
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| 218 | // we'll trust the OS to set initial semval to 0 (let's hope)
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| 219 | G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
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| 220 | if (G.s_semid == -1) {
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| 221 | if (errno == EEXIST) {
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| 222 | G.s_semid = semget(KEY_ID, 2, 0);
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| 223 | if (G.s_semid != -1)
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| 224 | return;
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[821] | 225 | }
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[1770] | 226 | bb_perror_msg_and_die("semget");
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[821] | 227 | }
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| 228 | }
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| 229 |
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[1770] | 230 | /* Write message to shared mem buffer */
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| 231 | static void log_to_shmem(const char *msg, int len)
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[821] | 232 | {
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[1770] | 233 | int old_tail, new_tail;
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[821] | 234 |
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[1770] | 235 | if (semop(G.s_semid, G.SMwdn, 3) == -1) {
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| 236 | bb_perror_msg_and_die("SMwdn");
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| 237 | }
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[821] | 238 |
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[1770] | 239 | /* Circular Buffer Algorithm:
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[821] | 240 | * --------------------------
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[1770] | 241 | * tail == position where to store next syslog message.
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| 242 | * tail's max value is (shbuf->size - 1)
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| 243 | * Last byte of buffer is never used and remains NUL.
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[821] | 244 | */
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[1770] | 245 | len++; /* length with NUL included */
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| 246 | again:
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| 247 | old_tail = G.shbuf->tail;
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| 248 | new_tail = old_tail + len;
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| 249 | if (new_tail < G.shbuf->size) {
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| 250 | /* store message, set new tail */
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| 251 | memcpy(G.shbuf->data + old_tail, msg, len);
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| 252 | G.shbuf->tail = new_tail;
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[821] | 253 | } else {
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[1770] | 254 | /* k == available buffer space ahead of old tail */
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| 255 | int k = G.shbuf->size - old_tail;
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| 256 | /* copy what fits to the end of buffer, and repeat */
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| 257 | memcpy(G.shbuf->data + old_tail, msg, k);
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| 258 | msg += k;
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| 259 | len -= k;
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| 260 | G.shbuf->tail = 0;
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| 261 | goto again;
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[821] | 262 | }
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[1770] | 263 | if (semop(G.s_semid, G.SMwup, 1) == -1) {
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| 264 | bb_perror_msg_and_die("SMwup");
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| 265 | }
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| 266 | if (DEBUG)
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| 267 | printf("tail:%d\n", G.shbuf->tail);
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[821] | 268 | }
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[1770] | 269 | #else
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| 270 | void ipcsyslog_cleanup(void);
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| 271 | void ipcsyslog_init(void);
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| 272 | void log_to_shmem(const char *msg);
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| 273 | #endif /* FEATURE_IPC_SYSLOG */
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[821] | 274 |
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[1770] | 275 |
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[821] | 276 | /* Print a message to the log file. */
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[1770] | 277 | static void log_locally(char *msg)
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[821] | 278 | {
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| 279 | struct flock fl;
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[1770] | 280 | int len = strlen(msg);
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[821] | 281 |
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[1770] | 282 | #if ENABLE_FEATURE_IPC_SYSLOG
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| 283 | if ((option_mask32 & OPT_circularlog) && G.shbuf) {
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| 284 | log_to_shmem(msg, len);
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| 285 | return;
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| 286 | }
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| 287 | #endif
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| 288 | if (G.logFD >= 0) {
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| 289 | time_t cur;
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| 290 | time(&cur);
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| 291 | if (G.last_log_time != cur) {
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| 292 | G.last_log_time = cur; /* reopen log file every second */
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| 293 | close(G.logFD);
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| 294 | goto reopen;
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| 295 | }
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| 296 | } else {
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| 297 | reopen:
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| 298 | G.logFD = device_open(G.logFilePath, O_WRONLY | O_CREAT
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| 299 | | O_NOCTTY | O_APPEND | O_NONBLOCK);
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| 300 | if (G.logFD < 0) {
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| 301 | /* cannot open logfile? - print to /dev/console then */
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| 302 | int fd = device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
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| 303 | if (fd < 0)
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| 304 | fd = 2; /* then stderr, dammit */
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| 305 | full_write(fd, msg, len);
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| 306 | if (fd != 2)
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| 307 | close(fd);
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| 308 | return;
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| 309 | }
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| 310 | #if ENABLE_FEATURE_ROTATE_LOGFILE
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| 311 | {
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| 312 | struct stat statf;
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| 313 | G.isRegular = (fstat(G.logFD, &statf) == 0 && S_ISREG(statf.st_mode));
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| 314 | /* bug (mostly harmless): can wrap around if file > 4gb */
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| 315 | G.curFileSize = statf.st_size;
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| 316 | }
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| 317 | #endif
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| 318 | }
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| 319 |
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[821] | 320 | fl.l_whence = SEEK_SET;
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| 321 | fl.l_start = 0;
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| 322 | fl.l_len = 1;
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[1770] | 323 | fl.l_type = F_WRLCK;
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| 324 | fcntl(G.logFD, F_SETLKW, &fl);
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[821] | 325 |
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[1770] | 326 | #if ENABLE_FEATURE_ROTATE_LOGFILE
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| 327 | if (G.logFileSize && G.isRegular && G.curFileSize > G.logFileSize) {
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| 328 | if (G.logFileRotate) { /* always 0..99 */
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| 329 | int i = strlen(G.logFilePath) + 3 + 1;
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| 330 | char oldFile[i];
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| 331 | char newFile[i];
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| 332 | i = G.logFileRotate - 1;
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| 333 | /* rename: f.8 -> f.9; f.7 -> f.8; ... */
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| 334 | while (1) {
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| 335 | sprintf(newFile, "%s.%d", G.logFilePath, i);
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| 336 | if (i == 0) break;
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| 337 | sprintf(oldFile, "%s.%d", G.logFilePath, --i);
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| 338 | rename(oldFile, newFile);
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| 339 | }
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| 340 | /* newFile == "f.0" now */
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| 341 | rename(G.logFilePath, newFile);
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| 342 | fl.l_type = F_UNLCK;
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| 343 | fcntl(G.logFD, F_SETLKW, &fl);
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| 344 | close(G.logFD);
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| 345 | goto reopen;
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| 346 | }
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| 347 | ftruncate(G.logFD, 0);
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| 348 | }
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| 349 | G.curFileSize +=
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| 350 | #endif
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| 351 | full_write(G.logFD, msg, len);
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| 352 | fl.l_type = F_UNLCK;
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| 353 | fcntl(G.logFD, F_SETLKW, &fl);
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| 354 | }
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[821] | 355 |
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[1770] | 356 | static void parse_fac_prio_20(int pri, char *res20)
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| 357 | {
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| 358 | const CODE *c_pri, *c_fac;
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[821] | 359 |
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[1770] | 360 | if (pri != 0) {
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| 361 | c_fac = facilitynames;
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| 362 | while (c_fac->c_name) {
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| 363 | if (c_fac->c_val != (LOG_FAC(pri) << 3)) {
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| 364 | c_fac++; continue;
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| 365 | }
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| 366 | /* facility is found, look for prio */
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| 367 | c_pri = prioritynames;
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| 368 | while (c_pri->c_name) {
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| 369 | if (c_pri->c_val != LOG_PRI(pri)) {
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| 370 | c_pri++; continue;
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[821] | 371 | }
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[1770] | 372 | snprintf(res20, 20, "%s.%s",
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| 373 | c_fac->c_name, c_pri->c_name);
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| 374 | return;
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[821] | 375 | }
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[1770] | 376 | /* prio not found, bail out */
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| 377 | break;
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[821] | 378 | }
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[1770] | 379 | snprintf(res20, 20, "<%d>", pri);
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[821] | 380 | }
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| 381 | }
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| 382 |
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[1770] | 383 | /* len parameter is used only for "is there a timestamp?" check.
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| 384 | * NB: some callers cheat and supply 0 when they know
|
---|
| 385 | * that there is no timestamp, short-cutting the test. */
|
---|
| 386 | static void timestamp_and_log(int pri, char *msg, int len)
|
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[821] | 387 | {
|
---|
| 388 | char *timestamp;
|
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| 389 |
|
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[1770] | 390 | if (len < 16 || msg[3] != ' ' || msg[6] != ' '
|
---|
| 391 | || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
|
---|
| 392 | ) {
|
---|
| 393 | time_t now;
|
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[821] | 394 | time(&now);
|
---|
| 395 | timestamp = ctime(&now) + 4;
|
---|
| 396 | } else {
|
---|
| 397 | timestamp = msg;
|
---|
| 398 | msg += 16;
|
---|
| 399 | }
|
---|
[1770] | 400 | timestamp[15] = '\0';
|
---|
[821] | 401 |
|
---|
[1770] | 402 | /* Log message locally (to file or shared mem) */
|
---|
| 403 | if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
|
---|
| 404 | if (LOG_PRI(pri) < G.logLevel) {
|
---|
| 405 | if (option_mask32 & OPT_small)
|
---|
| 406 | sprintf(G.printbuf, "%s %s\n", timestamp, msg);
|
---|
| 407 | else {
|
---|
| 408 | char res[20];
|
---|
| 409 | parse_fac_prio_20(pri, res);
|
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| 410 | sprintf(G.printbuf, "%s %s %s %s\n", timestamp, G.localHostName, res, msg);
|
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[821] | 411 | }
|
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[1770] | 412 | log_locally(G.printbuf);
|
---|
[821] | 413 | }
|
---|
| 414 | }
|
---|
| 415 | }
|
---|
| 416 |
|
---|
[1770] | 417 | static void split_escape_and_log(char *tmpbuf, int len)
|
---|
[821] | 418 | {
|
---|
| 419 | char *p = tmpbuf;
|
---|
| 420 |
|
---|
[1770] | 421 | tmpbuf += len;
|
---|
| 422 | while (p < tmpbuf) {
|
---|
| 423 | char c;
|
---|
| 424 | char *q = G.parsebuf;
|
---|
[821] | 425 | int pri = (LOG_USER | LOG_NOTICE);
|
---|
| 426 |
|
---|
[1770] | 427 | if (*p == '<') {
|
---|
| 428 | /* Parse the magic priority number */
|
---|
| 429 | pri = bb_strtou(p + 1, &p, 10);
|
---|
| 430 | if (*p == '>') p++;
|
---|
| 431 | if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) {
|
---|
| 432 | pri = (LOG_USER | LOG_NOTICE);
|
---|
| 433 | }
|
---|
| 434 | }
|
---|
| 435 |
|
---|
| 436 | while ((c = *p++)) {
|
---|
| 437 | if (c == '\n')
|
---|
| 438 | c = ' ';
|
---|
| 439 | if (!(c & ~0x1f) && c != '\t') {
|
---|
[821] | 440 | *q++ = '^';
|
---|
[1770] | 441 | c += '@'; /* ^@, ^A, ^B... */
|
---|
[821] | 442 | }
|
---|
[1770] | 443 | *q++ = c;
|
---|
[821] | 444 | }
|
---|
| 445 | *q = '\0';
|
---|
| 446 | /* Now log it */
|
---|
[1770] | 447 | timestamp_and_log(pri, G.parsebuf, q - G.parsebuf);
|
---|
[821] | 448 | }
|
---|
| 449 | }
|
---|
| 450 |
|
---|
[1770] | 451 | static void quit_signal(int sig)
|
---|
[821] | 452 | {
|
---|
[1770] | 453 | timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"syslogd exiting", 0);
|
---|
| 454 | puts("syslogd exiting");
|
---|
| 455 | if (ENABLE_FEATURE_IPC_SYSLOG)
|
---|
| 456 | ipcsyslog_cleanup();
|
---|
| 457 | exit(1);
|
---|
| 458 | }
|
---|
| 459 |
|
---|
| 460 | #ifdef SYSLOGD_MARK
|
---|
| 461 | static void do_mark(int sig)
|
---|
| 462 | {
|
---|
| 463 | if (G.markInterval) {
|
---|
| 464 | timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"-- MARK --", 0);
|
---|
| 465 | alarm(G.markInterval);
|
---|
| 466 | }
|
---|
| 467 | }
|
---|
| 468 | #endif
|
---|
| 469 |
|
---|
| 470 | static void do_syslogd(void) ATTRIBUTE_NORETURN;
|
---|
| 471 | static void do_syslogd(void)
|
---|
| 472 | {
|
---|
[821] | 473 | struct sockaddr_un sunx;
|
---|
| 474 | int sock_fd;
|
---|
| 475 | fd_set fds;
|
---|
[1770] | 476 | char *dev_log_name;
|
---|
[821] | 477 |
|
---|
[1770] | 478 | /* Set up signal handlers */
|
---|
[821] | 479 | signal(SIGINT, quit_signal);
|
---|
| 480 | signal(SIGTERM, quit_signal);
|
---|
| 481 | signal(SIGQUIT, quit_signal);
|
---|
| 482 | signal(SIGHUP, SIG_IGN);
|
---|
| 483 | signal(SIGCHLD, SIG_IGN);
|
---|
| 484 | #ifdef SIGCLD
|
---|
| 485 | signal(SIGCLD, SIG_IGN);
|
---|
| 486 | #endif
|
---|
[1770] | 487 | #ifdef SYSLOGD_MARK
|
---|
| 488 | signal(SIGALRM, do_mark);
|
---|
| 489 | alarm(G.markInterval);
|
---|
| 490 | #endif
|
---|
| 491 | remove_pidfile("/var/run/syslogd.pid");
|
---|
[821] | 492 |
|
---|
| 493 | memset(&sunx, 0, sizeof(sunx));
|
---|
| 494 | sunx.sun_family = AF_UNIX;
|
---|
[1770] | 495 | strcpy(sunx.sun_path, "/dev/log");
|
---|
| 496 |
|
---|
| 497 | /* Unlink old /dev/log or object it points to. */
|
---|
| 498 | /* (if it exists, bind will fail) */
|
---|
| 499 | logmode = LOGMODE_NONE;
|
---|
| 500 | dev_log_name = xmalloc_readlink_or_warn("/dev/log");
|
---|
| 501 | logmode = LOGMODE_STDIO;
|
---|
| 502 | if (dev_log_name) {
|
---|
| 503 | int fd = xopen(".", O_NONBLOCK);
|
---|
| 504 | xchdir("/dev");
|
---|
| 505 | /* we do not check whether this is a link also */
|
---|
| 506 | unlink(dev_log_name);
|
---|
| 507 | fchdir(fd);
|
---|
| 508 | close(fd);
|
---|
| 509 | safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
|
---|
| 510 | free(dev_log_name);
|
---|
| 511 | } else {
|
---|
| 512 | unlink("/dev/log");
|
---|
[821] | 513 | }
|
---|
| 514 |
|
---|
[1770] | 515 | sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
|
---|
| 516 | xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
|
---|
| 517 |
|
---|
| 518 | if (chmod("/dev/log", 0666) < 0) {
|
---|
| 519 | bb_perror_msg_and_die("cannot set permission on /dev/log");
|
---|
[821] | 520 | }
|
---|
[1770] | 521 | if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) {
|
---|
[821] | 522 | ipcsyslog_init();
|
---|
| 523 | }
|
---|
| 524 |
|
---|
[1770] | 525 | timestamp_and_log(LOG_SYSLOG | LOG_INFO,
|
---|
| 526 | (char*)"syslogd started: BusyBox v" BB_VER, 0);
|
---|
[821] | 527 |
|
---|
| 528 | for (;;) {
|
---|
| 529 | FD_ZERO(&fds);
|
---|
| 530 | FD_SET(sock_fd, &fds);
|
---|
| 531 |
|
---|
| 532 | if (select(sock_fd + 1, &fds, NULL, NULL, NULL) < 0) {
|
---|
| 533 | if (errno == EINTR) {
|
---|
[1770] | 534 | /* alarm may have happened */
|
---|
[821] | 535 | continue;
|
---|
| 536 | }
|
---|
[1770] | 537 | bb_perror_msg_and_die("select");
|
---|
[821] | 538 | }
|
---|
| 539 |
|
---|
| 540 | if (FD_ISSET(sock_fd, &fds)) {
|
---|
| 541 | int i;
|
---|
[1770] | 542 | i = recv(sock_fd, G.recvbuf, MAX_READ - 1, 0);
|
---|
| 543 | if (i <= 0)
|
---|
[821] | 544 | bb_perror_msg_and_die("UNIX socket error");
|
---|
[1770] | 545 | /* TODO: maybe suppress duplicates? */
|
---|
| 546 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
| 547 | /* We are not modifying log messages in any way before send */
|
---|
| 548 | /* Remote site cannot trust _us_ anyway and need to do validation again */
|
---|
| 549 | if (G.remoteAddr) {
|
---|
| 550 | if (-1 == G.remoteFD) {
|
---|
| 551 | G.remoteFD = socket(G.remoteAddr->sa.sa_family, SOCK_DGRAM, 0);
|
---|
| 552 | }
|
---|
| 553 | if (-1 != G.remoteFD) {
|
---|
| 554 | /* send message to remote logger, ignore possible error */
|
---|
| 555 | sendto(G.remoteFD, G.recvbuf, i, MSG_DONTWAIT,
|
---|
| 556 | &G.remoteAddr->sa, G.remoteAddr->len);
|
---|
| 557 | }
|
---|
[821] | 558 | }
|
---|
[1770] | 559 | #endif
|
---|
| 560 | G.recvbuf[i] = '\0';
|
---|
| 561 | split_escape_and_log(G.recvbuf, i);
|
---|
| 562 | } /* FD_ISSET() */
|
---|
| 563 | } /* for */
|
---|
[821] | 564 | }
|
---|
| 565 |
|
---|
[1770] | 566 | int syslogd_main(int argc, char **argv);
|
---|
[821] | 567 | int syslogd_main(int argc, char **argv)
|
---|
| 568 | {
|
---|
[1770] | 569 | char OPTION_DECL;
|
---|
| 570 | char *p;
|
---|
[821] | 571 |
|
---|
[1770] | 572 | PTR_TO_GLOBALS = memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data));
|
---|
[821] | 573 |
|
---|
| 574 | /* do normal option parsing */
|
---|
[1770] | 575 | opt_complementary = "=0"; /* no non-option params */
|
---|
| 576 | getopt32(argv, OPTION_STR, OPTION_PARAM);
|
---|
| 577 | #ifdef SYSLOGD_MARK
|
---|
| 578 | if (option_mask32 & OPT_mark) // -m
|
---|
| 579 | G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
|
---|
[821] | 580 | #endif
|
---|
[1770] | 581 | //if (option_mask32 & OPT_nofork) // -n
|
---|
| 582 | //if (option_mask32 & OPT_outfile) // -O
|
---|
| 583 | if (option_mask32 & OPT_loglevel) // -l
|
---|
| 584 | G.logLevel = xatou_range(opt_l, 1, 8);
|
---|
| 585 | //if (option_mask32 & OPT_small) // -S
|
---|
| 586 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
---|
| 587 | if (option_mask32 & OPT_filesize) // -s
|
---|
| 588 | G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
|
---|
| 589 | if (option_mask32 & OPT_rotatecnt) // -b
|
---|
| 590 | G.logFileRotate = xatou_range(opt_b, 0, 99);
|
---|
[821] | 591 | #endif
|
---|
[1770] | 592 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
| 593 | if (option_mask32 & OPT_remotelog) { // -R
|
---|
| 594 | G.remoteAddr = xhost2sockaddr(opt_R, 514);
|
---|
| 595 | }
|
---|
| 596 | //if (option_mask32 & OPT_locallog) // -L
|
---|
[821] | 597 | #endif
|
---|
[1770] | 598 | #if ENABLE_FEATURE_IPC_SYSLOG
|
---|
| 599 | if (opt_C) // -Cn
|
---|
| 600 | G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
|
---|
| 601 | #endif
|
---|
[821] | 602 |
|
---|
| 603 | /* If they have not specified remote logging, then log locally */
|
---|
[1770] | 604 | if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_remotelog))
|
---|
| 605 | option_mask32 |= OPT_locallog;
|
---|
[821] | 606 |
|
---|
| 607 | /* Store away localhost's name before the fork */
|
---|
[1770] | 608 | gethostname(G.localHostName, sizeof(G.localHostName));
|
---|
| 609 | p = strchr(G.localHostName, '.');
|
---|
| 610 | if (p) {
|
---|
[821] | 611 | *p = '\0';
|
---|
| 612 | }
|
---|
| 613 |
|
---|
[1770] | 614 | if (!(option_mask32 & OPT_nofork)) {
|
---|
| 615 | bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
|
---|
| 616 | }
|
---|
[821] | 617 | umask(0);
|
---|
[1770] | 618 | write_pidfile("/var/run/syslogd.pid");
|
---|
| 619 | do_syslogd();
|
---|
| 620 | /* return EXIT_SUCCESS; */
|
---|
[821] | 621 | }
|
---|