[3320] | 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 GPLv2 or later, see file LICENSE in this source tree.
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| 14 | */
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| 15 |
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| 16 | /*
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| 17 | * Done in syslogd_and_logger.c:
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| 18 | #include "libbb.h"
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| 19 | #define SYSLOG_NAMES
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| 20 | #define SYSLOG_NAMES_CONST
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| 21 | #include <syslog.h>
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| 22 | */
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| 23 |
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| 24 | #include <sys/un.h>
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| 25 | #include <sys/uio.h>
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| 26 |
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| 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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| 30 |
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| 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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| 36 |
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| 37 |
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| 38 | #define DEBUG 0
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| 39 |
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| 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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| 44 |
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| 45 | /* Write locking does not seem to be useful either */
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| 46 | #undef SYSLOGD_WRLOCK
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| 47 |
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| 48 | enum {
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| 49 | MAX_READ = CONFIG_FEATURE_SYSLOGD_READ_BUFFER_SIZE,
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| 50 | DNS_WAIT_SEC = 2 * 60,
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| 51 | };
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| 52 |
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| 53 | /* Semaphore operation structures */
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| 54 | struct shbuf_ds {
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| 55 | int32_t size; /* size of data - 1 */
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| 56 | int32_t tail; /* end of message list */
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| 57 | char data[1]; /* data/messages */
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| 58 | };
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| 59 |
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| 60 | #if ENABLE_FEATURE_REMOTE_LOG
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| 61 | typedef struct {
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| 62 | int remoteFD;
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| 63 | unsigned last_dns_resolve;
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| 64 | len_and_sockaddr *remoteAddr;
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| 65 | const char *remoteHostname;
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| 66 | } remoteHost_t;
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| 67 | #endif
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| 68 |
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| 69 | /* Allows us to have smaller initializer. Ugly. */
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| 70 | #define GLOBALS \
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| 71 | const char *logFilePath; \
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| 72 | int logFD; \
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| 73 | /* interval between marks in seconds */ \
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| 74 | /*int markInterval;*/ \
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| 75 | /* level of messages to be logged */ \
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| 76 | int logLevel; \
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| 77 | IF_FEATURE_ROTATE_LOGFILE( \
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| 78 | /* max size of file before rotation */ \
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| 79 | unsigned logFileSize; \
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| 80 | /* number of rotated message files */ \
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| 81 | unsigned logFileRotate; \
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| 82 | unsigned curFileSize; \
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| 83 | smallint isRegular; \
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| 84 | ) \
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| 85 | IF_FEATURE_IPC_SYSLOG( \
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| 86 | int shmid; /* ipc shared memory id */ \
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| 87 | int s_semid; /* ipc semaphore id */ \
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| 88 | int shm_size; \
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| 89 | struct sembuf SMwup[1]; \
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| 90 | struct sembuf SMwdn[3]; \
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| 91 | )
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| 92 |
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| 93 | struct init_globals {
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| 94 | GLOBALS
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| 95 | };
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| 96 |
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| 97 | struct globals {
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| 98 | GLOBALS
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| 99 |
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| 100 | #if ENABLE_FEATURE_REMOTE_LOG
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| 101 | llist_t *remoteHosts;
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| 102 | #endif
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| 103 | #if ENABLE_FEATURE_IPC_SYSLOG
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| 104 | struct shbuf_ds *shbuf;
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| 105 | #endif
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| 106 | time_t last_log_time;
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| 107 | /* localhost's name. We print only first 64 chars */
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| 108 | char *hostname;
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| 109 |
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| 110 | /* We recv into recvbuf... */
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| 111 | char recvbuf[MAX_READ * (1 + ENABLE_FEATURE_SYSLOGD_DUP)];
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| 112 | /* ...then copy to parsebuf, escaping control chars */
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| 113 | /* (can grow x2 max) */
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| 114 | char parsebuf[MAX_READ*2];
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| 115 | /* ...then sprintf into printbuf, adding timestamp (15 chars),
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| 116 | * host (64), fac.prio (20) to the message */
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| 117 | /* (growth by: 15 + 64 + 20 + delims = ~110) */
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| 118 | char printbuf[MAX_READ*2 + 128];
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| 119 | };
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| 120 |
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| 121 | static const struct init_globals init_data = {
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| 122 | .logFilePath = "/var/log/messages",
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| 123 | .logFD = -1,
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| 124 | #ifdef SYSLOGD_MARK
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| 125 | .markInterval = 20 * 60,
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| 126 | #endif
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| 127 | .logLevel = 8,
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| 128 | #if ENABLE_FEATURE_ROTATE_LOGFILE
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| 129 | .logFileSize = 200 * 1024,
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| 130 | .logFileRotate = 1,
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| 131 | #endif
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| 132 | #if ENABLE_FEATURE_IPC_SYSLOG
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| 133 | .shmid = -1,
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| 134 | .s_semid = -1,
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| 135 | .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), // default shm size
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| 136 | .SMwup = { {1, -1, IPC_NOWAIT} },
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| 137 | .SMwdn = { {0, 0}, {1, 0}, {1, +1} },
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| 138 | #endif
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| 139 | };
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| 140 |
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| 141 | #define G (*ptr_to_globals)
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| 142 | #define INIT_G() do { \
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| 143 | SET_PTR_TO_GLOBALS(memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data))); \
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| 144 | } while (0)
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| 145 |
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| 146 |
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| 147 | /* Options */
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| 148 | enum {
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| 149 | OPTBIT_mark = 0, // -m
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| 150 | OPTBIT_nofork, // -n
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| 151 | OPTBIT_outfile, // -O
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| 152 | OPTBIT_loglevel, // -l
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| 153 | OPTBIT_small, // -S
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| 154 | IF_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s
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| 155 | IF_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b
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| 156 | IF_FEATURE_REMOTE_LOG( OPTBIT_remotelog ,) // -R
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| 157 | IF_FEATURE_REMOTE_LOG( OPTBIT_locallog ,) // -L
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| 158 | IF_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C
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| 159 | IF_FEATURE_SYSLOGD_DUP( OPTBIT_dup ,) // -D
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| 160 |
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| 161 | OPT_mark = 1 << OPTBIT_mark ,
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| 162 | OPT_nofork = 1 << OPTBIT_nofork ,
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| 163 | OPT_outfile = 1 << OPTBIT_outfile ,
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| 164 | OPT_loglevel = 1 << OPTBIT_loglevel,
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| 165 | OPT_small = 1 << OPTBIT_small ,
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| 166 | OPT_filesize = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0,
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| 167 | OPT_rotatecnt = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 0,
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| 168 | OPT_remotelog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_remotelog )) + 0,
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| 169 | OPT_locallog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_locallog )) + 0,
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| 170 | OPT_circularlog = IF_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0,
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| 171 | OPT_dup = IF_FEATURE_SYSLOGD_DUP( (1 << OPTBIT_dup )) + 0,
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| 172 | };
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| 173 | #define OPTION_STR "m:nO:l:S" \
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| 174 | IF_FEATURE_ROTATE_LOGFILE("s:" ) \
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| 175 | IF_FEATURE_ROTATE_LOGFILE("b:" ) \
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| 176 | IF_FEATURE_REMOTE_LOG( "R:" ) \
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| 177 | IF_FEATURE_REMOTE_LOG( "L" ) \
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| 178 | IF_FEATURE_IPC_SYSLOG( "C::") \
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| 179 | IF_FEATURE_SYSLOGD_DUP( "D" )
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| 180 | #define OPTION_DECL *opt_m, *opt_l \
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| 181 | IF_FEATURE_ROTATE_LOGFILE(,*opt_s) \
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| 182 | IF_FEATURE_ROTATE_LOGFILE(,*opt_b) \
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| 183 | IF_FEATURE_IPC_SYSLOG( ,*opt_C = NULL)
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| 184 | #define OPTION_PARAM &opt_m, &G.logFilePath, &opt_l \
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| 185 | IF_FEATURE_ROTATE_LOGFILE(,&opt_s) \
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| 186 | IF_FEATURE_ROTATE_LOGFILE(,&opt_b) \
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| 187 | IF_FEATURE_REMOTE_LOG( ,&remoteAddrList) \
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| 188 | IF_FEATURE_IPC_SYSLOG( ,&opt_C)
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| 189 |
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| 190 |
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| 191 | /* circular buffer variables/structures */
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| 192 | #if ENABLE_FEATURE_IPC_SYSLOG
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| 193 |
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| 194 | #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
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| 195 | #error Sorry, you must set the syslogd buffer size to at least 4KB.
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| 196 | #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
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| 197 | #endif
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| 198 |
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| 199 | /* our shared key (syslogd.c and logread.c must be in sync) */
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| 200 | enum { KEY_ID = 0x414e4547 }; /* "GENA" */
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| 201 |
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| 202 | static void ipcsyslog_cleanup(void)
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| 203 | {
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| 204 | if (G.shmid != -1) {
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| 205 | shmdt(G.shbuf);
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| 206 | }
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| 207 | if (G.shmid != -1) {
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| 208 | shmctl(G.shmid, IPC_RMID, NULL);
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| 209 | }
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| 210 | if (G.s_semid != -1) {
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| 211 | semctl(G.s_semid, 0, IPC_RMID, 0);
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| 212 | }
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| 213 | }
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| 214 |
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| 215 | static void ipcsyslog_init(void)
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| 216 | {
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| 217 | if (DEBUG)
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| 218 | printf("shmget(%x, %d,...)\n", (int)KEY_ID, G.shm_size);
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| 219 |
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| 220 | G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644);
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| 221 | if (G.shmid == -1) {
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| 222 | bb_perror_msg_and_die("shmget");
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| 223 | }
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| 224 |
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| 225 | G.shbuf = shmat(G.shmid, NULL, 0);
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| 226 | if (G.shbuf == (void*) -1L) { /* shmat has bizarre error return */
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| 227 | bb_perror_msg_and_die("shmat");
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| 228 | }
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| 229 |
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| 230 | memset(G.shbuf, 0, G.shm_size);
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| 231 | G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data) - 1;
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| 232 | /*G.shbuf->tail = 0;*/
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| 233 |
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| 234 | // we'll trust the OS to set initial semval to 0 (let's hope)
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| 235 | G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
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| 236 | if (G.s_semid == -1) {
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| 237 | if (errno == EEXIST) {
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| 238 | G.s_semid = semget(KEY_ID, 2, 0);
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| 239 | if (G.s_semid != -1)
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| 240 | return;
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| 241 | }
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| 242 | bb_perror_msg_and_die("semget");
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| 243 | }
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| 244 | }
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| 245 |
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| 246 | /* Write message to shared mem buffer */
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| 247 | static void log_to_shmem(const char *msg, int len)
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| 248 | {
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| 249 | int old_tail, new_tail;
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| 250 |
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| 251 | if (semop(G.s_semid, G.SMwdn, 3) == -1) {
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| 252 | bb_perror_msg_and_die("SMwdn");
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| 253 | }
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| 254 |
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| 255 | /* Circular Buffer Algorithm:
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| 256 | * --------------------------
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| 257 | * tail == position where to store next syslog message.
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| 258 | * tail's max value is (shbuf->size - 1)
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| 259 | * Last byte of buffer is never used and remains NUL.
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| 260 | */
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| 261 | len++; /* length with NUL included */
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| 262 | again:
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| 263 | old_tail = G.shbuf->tail;
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| 264 | new_tail = old_tail + len;
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| 265 | if (new_tail < G.shbuf->size) {
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| 266 | /* store message, set new tail */
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| 267 | memcpy(G.shbuf->data + old_tail, msg, len);
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| 268 | G.shbuf->tail = new_tail;
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| 269 | } else {
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| 270 | /* k == available buffer space ahead of old tail */
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| 271 | int k = G.shbuf->size - old_tail;
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| 272 | /* copy what fits to the end of buffer, and repeat */
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| 273 | memcpy(G.shbuf->data + old_tail, msg, k);
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| 274 | msg += k;
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| 275 | len -= k;
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| 276 | G.shbuf->tail = 0;
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| 277 | goto again;
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| 278 | }
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| 279 | if (semop(G.s_semid, G.SMwup, 1) == -1) {
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| 280 | bb_perror_msg_and_die("SMwup");
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| 281 | }
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| 282 | if (DEBUG)
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| 283 | printf("tail:%d\n", G.shbuf->tail);
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| 284 | }
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| 285 | #else
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| 286 | void ipcsyslog_cleanup(void);
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| 287 | void ipcsyslog_init(void);
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| 288 | void log_to_shmem(const char *msg);
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| 289 | #endif /* FEATURE_IPC_SYSLOG */
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| 290 |
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| 291 |
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| 292 | /* Print a message to the log file. */
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| 293 | static void log_locally(time_t now, char *msg)
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| 294 | {
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| 295 | #ifdef SYSLOGD_WRLOCK
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| 296 | struct flock fl;
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| 297 | #endif
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| 298 | int len = strlen(msg);
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| 299 |
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| 300 | #if ENABLE_FEATURE_IPC_SYSLOG
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| 301 | if ((option_mask32 & OPT_circularlog) && G.shbuf) {
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| 302 | log_to_shmem(msg, len);
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| 303 | return;
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| 304 | }
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| 305 | #endif
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| 306 | if (G.logFD >= 0) {
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| 307 | /* Reopen log file every second. This allows admin
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| 308 | * to delete the file and not worry about restarting us.
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| 309 | * This costs almost nothing since it happens
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| 310 | * _at most_ once a second.
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| 311 | */
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| 312 | if (!now)
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| 313 | now = time(NULL);
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| 314 | if (G.last_log_time != now) {
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| 315 | G.last_log_time = now;
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| 316 | close(G.logFD);
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| 317 | goto reopen;
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| 318 | }
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| 319 | } else {
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| 320 | reopen:
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| 321 | G.logFD = open(G.logFilePath, O_WRONLY | O_CREAT
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| 322 | | O_NOCTTY | O_APPEND | O_NONBLOCK,
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| 323 | 0666);
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| 324 | if (G.logFD < 0) {
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| 325 | /* cannot open logfile? - print to /dev/console then */
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| 326 | int fd = device_open(DEV_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
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| 327 | if (fd < 0)
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| 328 | fd = 2; /* then stderr, dammit */
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| 329 | full_write(fd, msg, len);
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| 330 | if (fd != 2)
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| 331 | close(fd);
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| 332 | return;
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| 333 | }
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| 334 | #if ENABLE_FEATURE_ROTATE_LOGFILE
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| 335 | {
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| 336 | struct stat statf;
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| 337 | G.isRegular = (fstat(G.logFD, &statf) == 0 && S_ISREG(statf.st_mode));
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| 338 | /* bug (mostly harmless): can wrap around if file > 4gb */
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| 339 | G.curFileSize = statf.st_size;
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| 340 | }
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| 341 | #endif
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| 342 | }
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| 343 |
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| 344 | #ifdef SYSLOGD_WRLOCK
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| 345 | fl.l_whence = SEEK_SET;
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| 346 | fl.l_start = 0;
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| 347 | fl.l_len = 1;
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| 348 | fl.l_type = F_WRLCK;
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| 349 | fcntl(G.logFD, F_SETLKW, &fl);
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| 350 | #endif
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| 351 |
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| 352 | #if ENABLE_FEATURE_ROTATE_LOGFILE
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| 353 | if (G.logFileSize && G.isRegular && G.curFileSize > G.logFileSize) {
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| 354 | if (G.logFileRotate) { /* always 0..99 */
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| 355 | int i = strlen(G.logFilePath) + 3 + 1;
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| 356 | char oldFile[i];
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| 357 | char newFile[i];
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| 358 | i = G.logFileRotate - 1;
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| 359 | /* rename: f.8 -> f.9; f.7 -> f.8; ... */
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| 360 | while (1) {
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| 361 | sprintf(newFile, "%s.%d", G.logFilePath, i);
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| 362 | if (i == 0) break;
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| 363 | sprintf(oldFile, "%s.%d", G.logFilePath, --i);
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| 364 | /* ignore errors - file might be missing */
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| 365 | rename(oldFile, newFile);
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| 366 | }
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| 367 | /* newFile == "f.0" now */
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| 368 | rename(G.logFilePath, newFile);
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| 369 | #ifdef SYSLOGD_WRLOCK
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| 370 | fl.l_type = F_UNLCK;
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| 371 | fcntl(G.logFD, F_SETLKW, &fl);
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| 372 | #endif
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| 373 | close(G.logFD);
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| 374 | goto reopen;
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| 375 | }
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| 376 | ftruncate(G.logFD, 0);
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| 377 | }
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| 378 | G.curFileSize +=
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| 379 | #endif
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| 380 | full_write(G.logFD, msg, len);
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| 381 | #ifdef SYSLOGD_WRLOCK
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| 382 | fl.l_type = F_UNLCK;
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| 383 | fcntl(G.logFD, F_SETLKW, &fl);
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| 384 | #endif
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| 385 | }
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| 386 |
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| 387 | static void parse_fac_prio_20(int pri, char *res20)
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| 388 | {
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| 389 | const CODE *c_pri, *c_fac;
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| 390 |
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| 391 | if (pri != 0) {
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| 392 | c_fac = facilitynames;
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| 393 | while (c_fac->c_name) {
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| 394 | if (c_fac->c_val != (LOG_FAC(pri) << 3)) {
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| 395 | c_fac++;
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| 396 | continue;
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| 397 | }
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| 398 | /* facility is found, look for prio */
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| 399 | c_pri = prioritynames;
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| 400 | while (c_pri->c_name) {
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| 401 | if (c_pri->c_val != LOG_PRI(pri)) {
|
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| 402 | c_pri++;
|
---|
| 403 | continue;
|
---|
| 404 | }
|
---|
| 405 | snprintf(res20, 20, "%s.%s",
|
---|
| 406 | c_fac->c_name, c_pri->c_name);
|
---|
| 407 | return;
|
---|
| 408 | }
|
---|
| 409 | /* prio not found, bail out */
|
---|
| 410 | break;
|
---|
| 411 | }
|
---|
| 412 | snprintf(res20, 20, "<%d>", pri);
|
---|
| 413 | }
|
---|
| 414 | }
|
---|
| 415 |
|
---|
| 416 | /* len parameter is used only for "is there a timestamp?" check.
|
---|
| 417 | * NB: some callers cheat and supply len==0 when they know
|
---|
| 418 | * that there is no timestamp, short-circuiting the test. */
|
---|
| 419 | static void timestamp_and_log(int pri, char *msg, int len)
|
---|
| 420 | {
|
---|
| 421 | char *timestamp;
|
---|
| 422 | time_t now;
|
---|
| 423 |
|
---|
| 424 | /* Jan 18 00:11:22 msg... */
|
---|
| 425 | /* 01234567890123456 */
|
---|
| 426 | if (len < 16 || msg[3] != ' ' || msg[6] != ' '
|
---|
| 427 | || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
|
---|
| 428 | ) {
|
---|
| 429 | time(&now);
|
---|
| 430 | timestamp = ctime(&now) + 4; /* skip day of week */
|
---|
| 431 | } else {
|
---|
| 432 | now = 0;
|
---|
| 433 | timestamp = msg;
|
---|
| 434 | msg += 16;
|
---|
| 435 | }
|
---|
| 436 | timestamp[15] = '\0';
|
---|
| 437 |
|
---|
| 438 | if (option_mask32 & OPT_small)
|
---|
| 439 | sprintf(G.printbuf, "%s %s\n", timestamp, msg);
|
---|
| 440 | else {
|
---|
| 441 | char res[20];
|
---|
| 442 | parse_fac_prio_20(pri, res);
|
---|
| 443 | sprintf(G.printbuf, "%s %.64s %s %s\n", timestamp, G.hostname, res, msg);
|
---|
| 444 | }
|
---|
| 445 |
|
---|
| 446 | /* Log message locally (to file or shared mem) */
|
---|
| 447 | log_locally(now, G.printbuf);
|
---|
| 448 | }
|
---|
| 449 |
|
---|
| 450 | static void timestamp_and_log_internal(const char *msg)
|
---|
| 451 | {
|
---|
| 452 | /* -L, or no -R */
|
---|
| 453 | if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog))
|
---|
| 454 | return;
|
---|
| 455 | timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)msg, 0);
|
---|
| 456 | }
|
---|
| 457 |
|
---|
| 458 | /* tmpbuf[len] is a NUL byte (set by caller), but there can be other,
|
---|
| 459 | * embedded NULs. Split messages on each of these NULs, parse prio,
|
---|
| 460 | * escape control chars and log each locally. */
|
---|
| 461 | static void split_escape_and_log(char *tmpbuf, int len)
|
---|
| 462 | {
|
---|
| 463 | char *p = tmpbuf;
|
---|
| 464 |
|
---|
| 465 | tmpbuf += len;
|
---|
| 466 | while (p < tmpbuf) {
|
---|
| 467 | char c;
|
---|
| 468 | char *q = G.parsebuf;
|
---|
| 469 | int pri = (LOG_USER | LOG_NOTICE);
|
---|
| 470 |
|
---|
| 471 | if (*p == '<') {
|
---|
| 472 | /* Parse the magic priority number */
|
---|
| 473 | pri = bb_strtou(p + 1, &p, 10);
|
---|
| 474 | if (*p == '>')
|
---|
| 475 | p++;
|
---|
| 476 | if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
|
---|
| 477 | pri = (LOG_USER | LOG_NOTICE);
|
---|
| 478 | }
|
---|
| 479 |
|
---|
| 480 | while ((c = *p++)) {
|
---|
| 481 | if (c == '\n')
|
---|
| 482 | c = ' ';
|
---|
| 483 | if (!(c & ~0x1f) && c != '\t') {
|
---|
| 484 | *q++ = '^';
|
---|
| 485 | c += '@'; /* ^@, ^A, ^B... */
|
---|
| 486 | }
|
---|
| 487 | *q++ = c;
|
---|
| 488 | }
|
---|
| 489 | *q = '\0';
|
---|
| 490 |
|
---|
| 491 | /* Now log it */
|
---|
| 492 | if (LOG_PRI(pri) < G.logLevel)
|
---|
| 493 | timestamp_and_log(pri, G.parsebuf, q - G.parsebuf);
|
---|
| 494 | }
|
---|
| 495 | }
|
---|
| 496 |
|
---|
| 497 | #ifdef SYSLOGD_MARK
|
---|
| 498 | static void do_mark(int sig)
|
---|
| 499 | {
|
---|
| 500 | if (G.markInterval) {
|
---|
| 501 | timestamp_and_log_internal("-- MARK --");
|
---|
| 502 | alarm(G.markInterval);
|
---|
| 503 | }
|
---|
| 504 | }
|
---|
| 505 | #endif
|
---|
| 506 |
|
---|
| 507 | /* Don't inline: prevent struct sockaddr_un to take up space on stack
|
---|
| 508 | * permanently */
|
---|
| 509 | static NOINLINE int create_socket(void)
|
---|
| 510 | {
|
---|
| 511 | struct sockaddr_un sunx;
|
---|
| 512 | int sock_fd;
|
---|
| 513 | char *dev_log_name;
|
---|
| 514 |
|
---|
| 515 | memset(&sunx, 0, sizeof(sunx));
|
---|
| 516 | sunx.sun_family = AF_UNIX;
|
---|
| 517 |
|
---|
| 518 | /* Unlink old /dev/log or object it points to. */
|
---|
| 519 | /* (if it exists, bind will fail) */
|
---|
| 520 | strcpy(sunx.sun_path, "/dev/log");
|
---|
| 521 | dev_log_name = xmalloc_follow_symlinks("/dev/log");
|
---|
| 522 | if (dev_log_name) {
|
---|
| 523 | safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
|
---|
| 524 | free(dev_log_name);
|
---|
| 525 | }
|
---|
| 526 | unlink(sunx.sun_path);
|
---|
| 527 |
|
---|
| 528 | sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
|
---|
| 529 | xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
|
---|
| 530 | chmod("/dev/log", 0666);
|
---|
| 531 |
|
---|
| 532 | return sock_fd;
|
---|
| 533 | }
|
---|
| 534 |
|
---|
| 535 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
| 536 | static int try_to_resolve_remote(remoteHost_t *rh)
|
---|
| 537 | {
|
---|
| 538 | if (!rh->remoteAddr) {
|
---|
| 539 | unsigned now = monotonic_sec();
|
---|
| 540 |
|
---|
| 541 | /* Don't resolve name too often - DNS timeouts can be big */
|
---|
| 542 | if ((now - rh->last_dns_resolve) < DNS_WAIT_SEC)
|
---|
| 543 | return -1;
|
---|
| 544 | rh->last_dns_resolve = now;
|
---|
| 545 | rh->remoteAddr = host2sockaddr(rh->remoteHostname, 514);
|
---|
| 546 | if (!rh->remoteAddr)
|
---|
| 547 | return -1;
|
---|
| 548 | }
|
---|
| 549 | return xsocket(rh->remoteAddr->u.sa.sa_family, SOCK_DGRAM, 0);
|
---|
| 550 | }
|
---|
| 551 | #endif
|
---|
| 552 |
|
---|
| 553 | static void do_syslogd(void) NORETURN;
|
---|
| 554 | static void do_syslogd(void)
|
---|
| 555 | {
|
---|
| 556 | int sock_fd;
|
---|
| 557 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
| 558 | llist_t *item;
|
---|
| 559 | #endif
|
---|
| 560 | #if ENABLE_FEATURE_SYSLOGD_DUP
|
---|
| 561 | int last_sz = -1;
|
---|
| 562 | char *last_buf;
|
---|
| 563 | char *recvbuf = G.recvbuf;
|
---|
| 564 | #else
|
---|
| 565 | #define recvbuf (G.recvbuf)
|
---|
| 566 | #endif
|
---|
| 567 |
|
---|
| 568 | /* Set up signal handlers (so that they interrupt read()) */
|
---|
| 569 | signal_no_SA_RESTART_empty_mask(SIGTERM, record_signo);
|
---|
| 570 | signal_no_SA_RESTART_empty_mask(SIGINT, record_signo);
|
---|
| 571 | //signal_no_SA_RESTART_empty_mask(SIGQUIT, record_signo);
|
---|
| 572 | signal(SIGHUP, SIG_IGN);
|
---|
| 573 | #ifdef SYSLOGD_MARK
|
---|
| 574 | signal(SIGALRM, do_mark);
|
---|
| 575 | alarm(G.markInterval);
|
---|
| 576 | #endif
|
---|
| 577 | sock_fd = create_socket();
|
---|
| 578 |
|
---|
| 579 | if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) {
|
---|
| 580 | ipcsyslog_init();
|
---|
| 581 | }
|
---|
| 582 |
|
---|
| 583 | timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER);
|
---|
| 584 |
|
---|
| 585 | while (!bb_got_signal) {
|
---|
| 586 | ssize_t sz;
|
---|
| 587 |
|
---|
| 588 | #if ENABLE_FEATURE_SYSLOGD_DUP
|
---|
| 589 | last_buf = recvbuf;
|
---|
| 590 | if (recvbuf == G.recvbuf)
|
---|
| 591 | recvbuf = G.recvbuf + MAX_READ;
|
---|
| 592 | else
|
---|
| 593 | recvbuf = G.recvbuf;
|
---|
| 594 | #endif
|
---|
| 595 | read_again:
|
---|
| 596 | sz = read(sock_fd, recvbuf, MAX_READ - 1);
|
---|
| 597 | if (sz < 0) {
|
---|
| 598 | if (!bb_got_signal)
|
---|
| 599 | bb_perror_msg("read from /dev/log");
|
---|
| 600 | break;
|
---|
| 601 | }
|
---|
| 602 |
|
---|
| 603 | /* Drop trailing '\n' and NULs (typically there is one NUL) */
|
---|
| 604 | while (1) {
|
---|
| 605 | if (sz == 0)
|
---|
| 606 | goto read_again;
|
---|
| 607 | /* man 3 syslog says: "A trailing newline is added when needed".
|
---|
| 608 | * However, neither glibc nor uclibc do this:
|
---|
| 609 | * syslog(prio, "test") sends "test\0" to /dev/log,
|
---|
| 610 | * syslog(prio, "test\n") sends "test\n\0".
|
---|
| 611 | * IOW: newline is passed verbatim!
|
---|
| 612 | * I take it to mean that it's syslogd's job
|
---|
| 613 | * to make those look identical in the log files. */
|
---|
| 614 | if (recvbuf[sz-1] != '\0' && recvbuf[sz-1] != '\n')
|
---|
| 615 | break;
|
---|
| 616 | sz--;
|
---|
| 617 | }
|
---|
| 618 | #if ENABLE_FEATURE_SYSLOGD_DUP
|
---|
| 619 | if ((option_mask32 & OPT_dup) && (sz == last_sz))
|
---|
| 620 | if (memcmp(last_buf, recvbuf, sz) == 0)
|
---|
| 621 | continue;
|
---|
| 622 | last_sz = sz;
|
---|
| 623 | #endif
|
---|
| 624 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
| 625 | /* Stock syslogd sends it '\n'-terminated
|
---|
| 626 | * over network, mimic that */
|
---|
| 627 | recvbuf[sz] = '\n';
|
---|
| 628 |
|
---|
| 629 | /* We are not modifying log messages in any way before send */
|
---|
| 630 | /* Remote site cannot trust _us_ anyway and need to do validation again */
|
---|
| 631 | for (item = G.remoteHosts; item != NULL; item = item->link) {
|
---|
| 632 | remoteHost_t *rh = (remoteHost_t *)item->data;
|
---|
| 633 |
|
---|
| 634 | if (rh->remoteFD == -1) {
|
---|
| 635 | rh->remoteFD = try_to_resolve_remote(rh);
|
---|
| 636 | if (rh->remoteFD == -1)
|
---|
| 637 | continue;
|
---|
| 638 | }
|
---|
| 639 |
|
---|
| 640 | /* Send message to remote logger.
|
---|
| 641 | * On some errors, close and set remoteFD to -1
|
---|
| 642 | * so that DNS resolution is retried.
|
---|
| 643 | */
|
---|
| 644 | if (sendto(rh->remoteFD, recvbuf, sz+1,
|
---|
| 645 | MSG_DONTWAIT | MSG_NOSIGNAL,
|
---|
| 646 | &(rh->remoteAddr->u.sa), rh->remoteAddr->len) == -1
|
---|
| 647 | ) {
|
---|
| 648 | switch (errno) {
|
---|
| 649 | case ECONNRESET:
|
---|
| 650 | case ENOTCONN: /* paranoia */
|
---|
| 651 | case EPIPE:
|
---|
| 652 | close(rh->remoteFD);
|
---|
| 653 | rh->remoteFD = -1;
|
---|
| 654 | free(rh->remoteAddr);
|
---|
| 655 | rh->remoteAddr = NULL;
|
---|
| 656 | }
|
---|
| 657 | }
|
---|
| 658 | }
|
---|
| 659 | #endif
|
---|
| 660 | if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
|
---|
| 661 | recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */
|
---|
| 662 | split_escape_and_log(recvbuf, sz);
|
---|
| 663 | }
|
---|
| 664 | } /* while (!bb_got_signal) */
|
---|
| 665 |
|
---|
| 666 | timestamp_and_log_internal("syslogd exiting");
|
---|
| 667 | puts("syslogd exiting");
|
---|
| 668 | if (ENABLE_FEATURE_IPC_SYSLOG)
|
---|
| 669 | ipcsyslog_cleanup();
|
---|
| 670 | kill_myself_with_sig(bb_got_signal);
|
---|
| 671 | #undef recvbuf
|
---|
| 672 | }
|
---|
| 673 |
|
---|
| 674 | int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 675 | int syslogd_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 676 | {
|
---|
| 677 | int opts;
|
---|
| 678 | char OPTION_DECL;
|
---|
| 679 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
| 680 | llist_t *remoteAddrList = NULL;
|
---|
| 681 | #endif
|
---|
| 682 |
|
---|
| 683 | INIT_G();
|
---|
| 684 |
|
---|
| 685 | /* No non-option params, -R can occur multiple times */
|
---|
| 686 | opt_complementary = "=0" IF_FEATURE_REMOTE_LOG(":R::");
|
---|
| 687 | opts = getopt32(argv, OPTION_STR, OPTION_PARAM);
|
---|
| 688 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
| 689 | while (remoteAddrList) {
|
---|
| 690 | remoteHost_t *rh = xzalloc(sizeof(*rh));
|
---|
| 691 | rh->remoteHostname = llist_pop(&remoteAddrList);
|
---|
| 692 | rh->remoteFD = -1;
|
---|
| 693 | rh->last_dns_resolve = monotonic_sec() - DNS_WAIT_SEC - 1;
|
---|
| 694 | llist_add_to(&G.remoteHosts, rh);
|
---|
| 695 | }
|
---|
| 696 | #endif
|
---|
| 697 |
|
---|
| 698 | #ifdef SYSLOGD_MARK
|
---|
| 699 | if (opts & OPT_mark) // -m
|
---|
| 700 | G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
|
---|
| 701 | #endif
|
---|
| 702 | //if (opts & OPT_nofork) // -n
|
---|
| 703 | //if (opts & OPT_outfile) // -O
|
---|
| 704 | if (opts & OPT_loglevel) // -l
|
---|
| 705 | G.logLevel = xatou_range(opt_l, 1, 8);
|
---|
| 706 | //if (opts & OPT_small) // -S
|
---|
| 707 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
---|
| 708 | if (opts & OPT_filesize) // -s
|
---|
| 709 | G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
|
---|
| 710 | if (opts & OPT_rotatecnt) // -b
|
---|
| 711 | G.logFileRotate = xatou_range(opt_b, 0, 99);
|
---|
| 712 | #endif
|
---|
| 713 | #if ENABLE_FEATURE_IPC_SYSLOG
|
---|
| 714 | if (opt_C) // -Cn
|
---|
| 715 | G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
|
---|
| 716 | #endif
|
---|
| 717 |
|
---|
| 718 | /* If they have not specified remote logging, then log locally */
|
---|
| 719 | if (ENABLE_FEATURE_REMOTE_LOG && !(opts & OPT_remotelog)) // -R
|
---|
| 720 | option_mask32 |= OPT_locallog;
|
---|
| 721 |
|
---|
| 722 | /* Store away localhost's name before the fork */
|
---|
| 723 | G.hostname = safe_gethostname();
|
---|
| 724 | *strchrnul(G.hostname, '.') = '\0';
|
---|
| 725 |
|
---|
| 726 | if (!(opts & OPT_nofork)) {
|
---|
| 727 | bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
|
---|
| 728 | }
|
---|
| 729 | //umask(0); - why??
|
---|
| 730 | write_pidfile("/var/run/syslogd.pid");
|
---|
| 731 | do_syslogd();
|
---|
| 732 | /* return EXIT_SUCCESS; */
|
---|
| 733 | }
|
---|
| 734 |
|
---|
| 735 | /* Clean up. Needed because we are included from syslogd_and_logger.c */
|
---|
| 736 | #undef DEBUG
|
---|
| 737 | #undef SYSLOGD_MARK
|
---|
| 738 | #undef SYSLOGD_WRLOCK
|
---|
| 739 | #undef G
|
---|
| 740 | #undef GLOBALS
|
---|
| 741 | #undef INIT_G
|
---|
| 742 | #undef OPTION_STR
|
---|
| 743 | #undef OPTION_DECL
|
---|
| 744 | #undef OPTION_PARAM
|
---|