| 1 | /* vi: set sw=4 ts=4: */
|
|---|
| 2 | /*
|
|---|
| 3 | * Mini syslogd implementation for busybox
|
|---|
| 4 | *
|
|---|
| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
|
|---|
| 6 | *
|
|---|
| 7 | * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
|
|---|
| 8 | *
|
|---|
| 9 | * "circular buffer" Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>
|
|---|
| 10 | *
|
|---|
| 11 | * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
|
|---|
| 12 | *
|
|---|
| 13 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|---|
| 14 | */
|
|---|
| 15 | //config:config SYSLOGD
|
|---|
| 16 | //config: bool "syslogd"
|
|---|
| 17 | //config: default y
|
|---|
| 18 | //config: help
|
|---|
| 19 | //config: The syslogd utility is used to record logs of all the
|
|---|
| 20 | //config: significant events that occur on a system. Every
|
|---|
| 21 | //config: message that is logged records the date and time of the
|
|---|
| 22 | //config: event, and will generally also record the name of the
|
|---|
| 23 | //config: application that generated the message. When used in
|
|---|
| 24 | //config: conjunction with klogd, messages from the Linux kernel
|
|---|
| 25 | //config: can also be recorded. This is terribly useful,
|
|---|
| 26 | //config: especially for finding what happened when something goes
|
|---|
| 27 | //config: wrong. And something almost always will go wrong if
|
|---|
| 28 | //config: you wait long enough....
|
|---|
| 29 | //config:
|
|---|
| 30 | //config:config FEATURE_ROTATE_LOGFILE
|
|---|
| 31 | //config: bool "Rotate message files"
|
|---|
| 32 | //config: default y
|
|---|
| 33 | //config: depends on SYSLOGD
|
|---|
| 34 | //config: help
|
|---|
| 35 | //config: This enables syslogd to rotate the message files
|
|---|
| 36 | //config: on his own. No need to use an external rotate script.
|
|---|
| 37 | //config:
|
|---|
| 38 | //config:config FEATURE_REMOTE_LOG
|
|---|
| 39 | //config: bool "Remote Log support"
|
|---|
| 40 | //config: default y
|
|---|
| 41 | //config: depends on SYSLOGD
|
|---|
| 42 | //config: help
|
|---|
| 43 | //config: When you enable this feature, the syslogd utility can
|
|---|
| 44 | //config: be used to send system log messages to another system
|
|---|
| 45 | //config: connected via a network. This allows the remote
|
|---|
| 46 | //config: machine to log all the system messages, which can be
|
|---|
| 47 | //config: terribly useful for reducing the number of serial
|
|---|
| 48 | //config: cables you use. It can also be a very good security
|
|---|
| 49 | //config: measure to prevent system logs from being tampered with
|
|---|
| 50 | //config: by an intruder.
|
|---|
| 51 | //config:
|
|---|
| 52 | //config:config FEATURE_SYSLOGD_DUP
|
|---|
| 53 | //config: bool "Support -D (drop dups) option"
|
|---|
| 54 | //config: default y
|
|---|
| 55 | //config: depends on SYSLOGD
|
|---|
| 56 | //config: help
|
|---|
| 57 | //config: Option -D instructs syslogd to drop consecutive messages
|
|---|
| 58 | //config: which are totally the same.
|
|---|
| 59 | //config:
|
|---|
| 60 | //config:config FEATURE_SYSLOGD_CFG
|
|---|
| 61 | //config: bool "Support syslog.conf"
|
|---|
| 62 | //config: default y
|
|---|
| 63 | //config: depends on SYSLOGD
|
|---|
| 64 | //config: help
|
|---|
| 65 | //config: Supports restricted syslogd config. See docs/syslog.conf.txt
|
|---|
| 66 | //config:
|
|---|
| 67 | //config:config FEATURE_SYSLOGD_READ_BUFFER_SIZE
|
|---|
| 68 | //config: int "Read buffer size in bytes"
|
|---|
| 69 | //config: default 256
|
|---|
| 70 | //config: range 256 20000
|
|---|
| 71 | //config: depends on SYSLOGD
|
|---|
| 72 | //config: help
|
|---|
| 73 | //config: This option sets the size of the syslog read buffer.
|
|---|
| 74 | //config: Actual memory usage increases around five times the
|
|---|
| 75 | //config: change done here.
|
|---|
| 76 | //config:
|
|---|
| 77 | //config:config FEATURE_IPC_SYSLOG
|
|---|
| 78 | //config: bool "Circular Buffer support"
|
|---|
| 79 | //config: default y
|
|---|
| 80 | //config: depends on SYSLOGD
|
|---|
| 81 | //config: help
|
|---|
| 82 | //config: When you enable this feature, the syslogd utility will
|
|---|
| 83 | //config: use a circular buffer to record system log messages.
|
|---|
| 84 | //config: When the buffer is filled it will continue to overwrite
|
|---|
| 85 | //config: the oldest messages. This can be very useful for
|
|---|
| 86 | //config: systems with little or no permanent storage, since
|
|---|
| 87 | //config: otherwise system logs can eventually fill up your
|
|---|
| 88 | //config: entire filesystem, which may cause your system to
|
|---|
| 89 | //config: break badly.
|
|---|
| 90 | //config:
|
|---|
| 91 | //config:config FEATURE_IPC_SYSLOG_BUFFER_SIZE
|
|---|
| 92 | //config: int "Circular buffer size in Kbytes (minimum 4KB)"
|
|---|
| 93 | //config: default 16
|
|---|
| 94 | //config: range 4 2147483647
|
|---|
| 95 | //config: depends on FEATURE_IPC_SYSLOG
|
|---|
| 96 | //config: help
|
|---|
| 97 | //config: This option sets the size of the circular buffer
|
|---|
| 98 | //config: used to record system log messages.
|
|---|
| 99 | //config:
|
|---|
| 100 | //config:config FEATURE_KMSG_SYSLOG
|
|---|
| 101 | //config: bool "Linux kernel printk buffer support"
|
|---|
| 102 | //config: default y
|
|---|
| 103 | //config: depends on SYSLOGD
|
|---|
| 104 | //config: select PLATFORM_LINUX
|
|---|
| 105 | //config: help
|
|---|
| 106 | //config: When you enable this feature, the syslogd utility will
|
|---|
| 107 | //config: write system log message to the Linux kernel's printk buffer.
|
|---|
| 108 | //config: This can be used as a smaller alternative to the syslogd IPC
|
|---|
| 109 | //config: support, as klogd and logread aren't needed.
|
|---|
| 110 | //config:
|
|---|
| 111 | //config: NOTICE: Syslog facilities in log entries needs kernel 3.5+.
|
|---|
| 112 |
|
|---|
| 113 | //applet:IF_SYSLOGD(APPLET(syslogd, BB_DIR_SBIN, BB_SUID_DROP))
|
|---|
| 114 |
|
|---|
| 115 | //kbuild:lib-$(CONFIG_SYSLOGD) += syslogd_and_logger.o
|
|---|
| 116 |
|
|---|
| 117 | //usage:#define syslogd_trivial_usage
|
|---|
| 118 | //usage: "[OPTIONS]"
|
|---|
| 119 | //usage:#define syslogd_full_usage "\n\n"
|
|---|
| 120 | //usage: "System logging utility\n"
|
|---|
| 121 | //usage: IF_NOT_FEATURE_SYSLOGD_CFG(
|
|---|
| 122 | //usage: "(this version of syslogd ignores /etc/syslog.conf)\n"
|
|---|
| 123 | //usage: )
|
|---|
| 124 | //usage: "\n -n Run in foreground"
|
|---|
| 125 | //usage: IF_FEATURE_REMOTE_LOG(
|
|---|
| 126 | //usage: "\n -R HOST[:PORT] Log to HOST:PORT (default PORT:514)"
|
|---|
| 127 | //usage: "\n -L Log locally and via network (default is network only if -R)"
|
|---|
| 128 | //usage: )
|
|---|
| 129 | //usage: IF_FEATURE_IPC_SYSLOG(
|
|---|
| 130 | /* NB: -Csize shouldn't have space (because size is optional) */
|
|---|
| 131 | //usage: "\n -C[size_kb] Log to shared mem buffer (use logread to read it)"
|
|---|
| 132 | //usage: )
|
|---|
| 133 | //usage: IF_FEATURE_KMSG_SYSLOG(
|
|---|
| 134 | //usage: "\n -K Log to kernel printk buffer (use dmesg to read it)"
|
|---|
| 135 | //usage: )
|
|---|
| 136 | //usage: "\n -O FILE Log to FILE (default: /var/log/messages, stdout if -)"
|
|---|
| 137 | //usage: IF_FEATURE_ROTATE_LOGFILE(
|
|---|
| 138 | //usage: "\n -s SIZE Max size (KB) before rotation (default:200KB, 0=off)"
|
|---|
| 139 | //usage: "\n -b N N rotated logs to keep (default:1, max=99, 0=purge)"
|
|---|
| 140 | //usage: )
|
|---|
| 141 | //usage: "\n -l N Log only messages more urgent than prio N (1-8)"
|
|---|
| 142 | //usage: "\n -S Smaller output"
|
|---|
| 143 | //usage: IF_FEATURE_SYSLOGD_DUP(
|
|---|
| 144 | //usage: "\n -D Drop duplicates"
|
|---|
| 145 | //usage: )
|
|---|
| 146 | //usage: IF_FEATURE_SYSLOGD_CFG(
|
|---|
| 147 | //usage: "\n -f FILE Use FILE as config (default:/etc/syslog.conf)"
|
|---|
| 148 | //usage: )
|
|---|
| 149 | /* //usage: "\n -m MIN Minutes between MARK lines (default:20, 0=off)" */
|
|---|
| 150 | //usage:
|
|---|
| 151 | //usage:#define syslogd_example_usage
|
|---|
| 152 | //usage: "$ syslogd -R masterlog:514\n"
|
|---|
| 153 | //usage: "$ syslogd -R 192.168.1.1:601\n"
|
|---|
| 154 |
|
|---|
| 155 | /*
|
|---|
| 156 | * Done in syslogd_and_logger.c:
|
|---|
| 157 | #include "libbb.h"
|
|---|
| 158 | #define SYSLOG_NAMES
|
|---|
| 159 | #define SYSLOG_NAMES_CONST
|
|---|
| 160 | #include <syslog.h>
|
|---|
| 161 | */
|
|---|
| 162 | #ifndef _PATH_LOG
|
|---|
| 163 | #define _PATH_LOG "/dev/log"
|
|---|
| 164 | #endif
|
|---|
| 165 |
|
|---|
| 166 | #include <sys/un.h>
|
|---|
| 167 | #include <sys/uio.h>
|
|---|
| 168 |
|
|---|
| 169 | #if ENABLE_FEATURE_REMOTE_LOG
|
|---|
| 170 | #include <netinet/in.h>
|
|---|
| 171 | #endif
|
|---|
| 172 |
|
|---|
| 173 | #if ENABLE_FEATURE_IPC_SYSLOG
|
|---|
| 174 | #include <sys/ipc.h>
|
|---|
| 175 | #include <sys/sem.h>
|
|---|
| 176 | #include <sys/shm.h>
|
|---|
| 177 | #endif
|
|---|
| 178 |
|
|---|
| 179 |
|
|---|
| 180 | #define DEBUG 0
|
|---|
| 181 |
|
|---|
| 182 | /* MARK code is not very useful, is bloat, and broken:
|
|---|
| 183 | * can deadlock if alarmed to make MARK while writing to IPC buffer
|
|---|
| 184 | * (semaphores are down but do_mark routine tries to down them again) */
|
|---|
| 185 | #undef SYSLOGD_MARK
|
|---|
| 186 |
|
|---|
| 187 | /* Write locking does not seem to be useful either */
|
|---|
| 188 | #undef SYSLOGD_WRLOCK
|
|---|
| 189 |
|
|---|
| 190 | enum {
|
|---|
| 191 | MAX_READ = CONFIG_FEATURE_SYSLOGD_READ_BUFFER_SIZE,
|
|---|
| 192 | DNS_WAIT_SEC = 2 * 60,
|
|---|
| 193 | };
|
|---|
| 194 |
|
|---|
| 195 | /* Semaphore operation structures */
|
|---|
| 196 | struct shbuf_ds {
|
|---|
| 197 | int32_t size; /* size of data - 1 */
|
|---|
| 198 | int32_t tail; /* end of message list */
|
|---|
| 199 | char data[1]; /* data/messages */
|
|---|
| 200 | };
|
|---|
| 201 |
|
|---|
| 202 | #if ENABLE_FEATURE_REMOTE_LOG
|
|---|
| 203 | typedef struct {
|
|---|
| 204 | int remoteFD;
|
|---|
| 205 | unsigned last_dns_resolve;
|
|---|
| 206 | len_and_sockaddr *remoteAddr;
|
|---|
| 207 | const char *remoteHostname;
|
|---|
| 208 | } remoteHost_t;
|
|---|
| 209 | #endif
|
|---|
| 210 |
|
|---|
| 211 | typedef struct logFile_t {
|
|---|
| 212 | const char *path;
|
|---|
| 213 | int fd;
|
|---|
| 214 | time_t last_log_time;
|
|---|
| 215 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
|---|
| 216 | unsigned size;
|
|---|
| 217 | uint8_t isRegular;
|
|---|
| 218 | #endif
|
|---|
| 219 | } logFile_t;
|
|---|
| 220 |
|
|---|
| 221 | #if ENABLE_FEATURE_SYSLOGD_CFG
|
|---|
| 222 | typedef struct logRule_t {
|
|---|
| 223 | uint8_t enabled_facility_priomap[LOG_NFACILITIES];
|
|---|
| 224 | struct logFile_t *file;
|
|---|
| 225 | struct logRule_t *next;
|
|---|
| 226 | } logRule_t;
|
|---|
| 227 | #endif
|
|---|
| 228 |
|
|---|
| 229 | /* Allows us to have smaller initializer. Ugly. */
|
|---|
| 230 | #define GLOBALS \
|
|---|
| 231 | logFile_t logFile; \
|
|---|
| 232 | /* interval between marks in seconds */ \
|
|---|
| 233 | /*int markInterval;*/ \
|
|---|
| 234 | /* level of messages to be logged */ \
|
|---|
| 235 | int logLevel; \
|
|---|
| 236 | IF_FEATURE_ROTATE_LOGFILE( \
|
|---|
| 237 | /* max size of file before rotation */ \
|
|---|
| 238 | unsigned logFileSize; \
|
|---|
| 239 | /* number of rotated message files */ \
|
|---|
| 240 | unsigned logFileRotate; \
|
|---|
| 241 | ) \
|
|---|
| 242 | IF_FEATURE_IPC_SYSLOG( \
|
|---|
| 243 | int shmid; /* ipc shared memory id */ \
|
|---|
| 244 | int s_semid; /* ipc semaphore id */ \
|
|---|
| 245 | int shm_size; \
|
|---|
| 246 | struct sembuf SMwup[1]; \
|
|---|
| 247 | struct sembuf SMwdn[3]; \
|
|---|
| 248 | ) \
|
|---|
| 249 | IF_FEATURE_SYSLOGD_CFG( \
|
|---|
| 250 | logRule_t *log_rules; \
|
|---|
| 251 | ) \
|
|---|
| 252 | IF_FEATURE_KMSG_SYSLOG( \
|
|---|
| 253 | int kmsgfd; \
|
|---|
| 254 | int primask; \
|
|---|
| 255 | )
|
|---|
| 256 |
|
|---|
| 257 | struct init_globals {
|
|---|
| 258 | GLOBALS
|
|---|
| 259 | };
|
|---|
| 260 |
|
|---|
| 261 | struct globals {
|
|---|
| 262 | GLOBALS
|
|---|
| 263 |
|
|---|
| 264 | #if ENABLE_FEATURE_REMOTE_LOG
|
|---|
| 265 | llist_t *remoteHosts;
|
|---|
| 266 | #endif
|
|---|
| 267 | #if ENABLE_FEATURE_IPC_SYSLOG
|
|---|
| 268 | struct shbuf_ds *shbuf;
|
|---|
| 269 | #endif
|
|---|
| 270 | /* localhost's name. We print only first 64 chars */
|
|---|
| 271 | char *hostname;
|
|---|
| 272 |
|
|---|
| 273 | /* We recv into recvbuf... */
|
|---|
| 274 | char recvbuf[MAX_READ * (1 + ENABLE_FEATURE_SYSLOGD_DUP)];
|
|---|
| 275 | /* ...then copy to parsebuf, escaping control chars */
|
|---|
| 276 | /* (can grow x2 max) */
|
|---|
| 277 | char parsebuf[MAX_READ*2];
|
|---|
| 278 | /* ...then sprintf into printbuf, adding timestamp (15 chars),
|
|---|
| 279 | * host (64), fac.prio (20) to the message */
|
|---|
| 280 | /* (growth by: 15 + 64 + 20 + delims = ~110) */
|
|---|
| 281 | char printbuf[MAX_READ*2 + 128];
|
|---|
| 282 | };
|
|---|
| 283 |
|
|---|
| 284 | static const struct init_globals init_data = {
|
|---|
| 285 | .logFile = {
|
|---|
| 286 | .path = "/var/log/messages",
|
|---|
| 287 | .fd = -1,
|
|---|
| 288 | },
|
|---|
| 289 | #ifdef SYSLOGD_MARK
|
|---|
| 290 | .markInterval = 20 * 60,
|
|---|
| 291 | #endif
|
|---|
| 292 | .logLevel = 8,
|
|---|
| 293 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
|---|
| 294 | .logFileSize = 200 * 1024,
|
|---|
| 295 | .logFileRotate = 1,
|
|---|
| 296 | #endif
|
|---|
| 297 | #if ENABLE_FEATURE_IPC_SYSLOG
|
|---|
| 298 | .shmid = -1,
|
|---|
| 299 | .s_semid = -1,
|
|---|
| 300 | .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), /* default shm size */
|
|---|
| 301 | .SMwup = { {1, -1, IPC_NOWAIT} },
|
|---|
| 302 | .SMwdn = { {0, 0}, {1, 0}, {1, +1} },
|
|---|
| 303 | #endif
|
|---|
| 304 | };
|
|---|
| 305 |
|
|---|
| 306 | #define G (*ptr_to_globals)
|
|---|
| 307 | #define INIT_G() do { \
|
|---|
| 308 | SET_PTR_TO_GLOBALS(memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data))); \
|
|---|
| 309 | } while (0)
|
|---|
| 310 |
|
|---|
| 311 |
|
|---|
| 312 | /* Options */
|
|---|
| 313 | enum {
|
|---|
| 314 | OPTBIT_mark = 0, // -m
|
|---|
| 315 | OPTBIT_nofork, // -n
|
|---|
| 316 | OPTBIT_outfile, // -O
|
|---|
| 317 | OPTBIT_loglevel, // -l
|
|---|
| 318 | OPTBIT_small, // -S
|
|---|
| 319 | IF_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s
|
|---|
| 320 | IF_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b
|
|---|
| 321 | IF_FEATURE_REMOTE_LOG( OPTBIT_remotelog ,) // -R
|
|---|
| 322 | IF_FEATURE_REMOTE_LOG( OPTBIT_locallog ,) // -L
|
|---|
| 323 | IF_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C
|
|---|
| 324 | IF_FEATURE_SYSLOGD_DUP( OPTBIT_dup ,) // -D
|
|---|
| 325 | IF_FEATURE_SYSLOGD_CFG( OPTBIT_cfg ,) // -f
|
|---|
| 326 | IF_FEATURE_KMSG_SYSLOG( OPTBIT_kmsg ,) // -K
|
|---|
| 327 |
|
|---|
| 328 | OPT_mark = 1 << OPTBIT_mark ,
|
|---|
| 329 | OPT_nofork = 1 << OPTBIT_nofork ,
|
|---|
| 330 | OPT_outfile = 1 << OPTBIT_outfile ,
|
|---|
| 331 | OPT_loglevel = 1 << OPTBIT_loglevel,
|
|---|
| 332 | OPT_small = 1 << OPTBIT_small ,
|
|---|
| 333 | OPT_filesize = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0,
|
|---|
| 334 | OPT_rotatecnt = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 0,
|
|---|
| 335 | OPT_remotelog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_remotelog )) + 0,
|
|---|
| 336 | OPT_locallog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_locallog )) + 0,
|
|---|
| 337 | OPT_circularlog = IF_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0,
|
|---|
| 338 | OPT_dup = IF_FEATURE_SYSLOGD_DUP( (1 << OPTBIT_dup )) + 0,
|
|---|
| 339 | OPT_cfg = IF_FEATURE_SYSLOGD_CFG( (1 << OPTBIT_cfg )) + 0,
|
|---|
| 340 | OPT_kmsg = IF_FEATURE_KMSG_SYSLOG( (1 << OPTBIT_kmsg )) + 0,
|
|---|
| 341 | };
|
|---|
| 342 | #define OPTION_STR "m:nO:l:S" \
|
|---|
| 343 | IF_FEATURE_ROTATE_LOGFILE("s:" ) \
|
|---|
| 344 | IF_FEATURE_ROTATE_LOGFILE("b:" ) \
|
|---|
| 345 | IF_FEATURE_REMOTE_LOG( "R:" ) \
|
|---|
| 346 | IF_FEATURE_REMOTE_LOG( "L" ) \
|
|---|
| 347 | IF_FEATURE_IPC_SYSLOG( "C::") \
|
|---|
| 348 | IF_FEATURE_SYSLOGD_DUP( "D" ) \
|
|---|
| 349 | IF_FEATURE_SYSLOGD_CFG( "f:" ) \
|
|---|
| 350 | IF_FEATURE_KMSG_SYSLOG( "K" )
|
|---|
| 351 | #define OPTION_DECL *opt_m, *opt_l \
|
|---|
| 352 | IF_FEATURE_ROTATE_LOGFILE(,*opt_s) \
|
|---|
| 353 | IF_FEATURE_ROTATE_LOGFILE(,*opt_b) \
|
|---|
| 354 | IF_FEATURE_IPC_SYSLOG( ,*opt_C = NULL) \
|
|---|
| 355 | IF_FEATURE_SYSLOGD_CFG( ,*opt_f = NULL)
|
|---|
| 356 | #define OPTION_PARAM &opt_m, &(G.logFile.path), &opt_l \
|
|---|
| 357 | IF_FEATURE_ROTATE_LOGFILE(,&opt_s) \
|
|---|
| 358 | IF_FEATURE_ROTATE_LOGFILE(,&opt_b) \
|
|---|
| 359 | IF_FEATURE_REMOTE_LOG( ,&remoteAddrList) \
|
|---|
| 360 | IF_FEATURE_IPC_SYSLOG( ,&opt_C) \
|
|---|
| 361 | IF_FEATURE_SYSLOGD_CFG( ,&opt_f)
|
|---|
| 362 |
|
|---|
| 363 |
|
|---|
| 364 | #if ENABLE_FEATURE_SYSLOGD_CFG
|
|---|
| 365 | static const CODE* find_by_name(char *name, const CODE* c_set)
|
|---|
| 366 | {
|
|---|
| 367 | for (; c_set->c_name; c_set++) {
|
|---|
| 368 | if (strcmp(name, c_set->c_name) == 0)
|
|---|
| 369 | return c_set;
|
|---|
| 370 | }
|
|---|
| 371 | return NULL;
|
|---|
| 372 | }
|
|---|
| 373 | #endif
|
|---|
| 374 | static const CODE* find_by_val(int val, const CODE* c_set)
|
|---|
| 375 | {
|
|---|
| 376 | for (; c_set->c_name; c_set++) {
|
|---|
| 377 | if (c_set->c_val == val)
|
|---|
| 378 | return c_set;
|
|---|
| 379 | }
|
|---|
| 380 | return NULL;
|
|---|
| 381 | }
|
|---|
| 382 |
|
|---|
| 383 | #if ENABLE_FEATURE_SYSLOGD_CFG
|
|---|
| 384 | static void parse_syslogdcfg(const char *file)
|
|---|
| 385 | {
|
|---|
| 386 | char *t;
|
|---|
| 387 | logRule_t **pp_rule;
|
|---|
| 388 | /* tok[0] set of selectors */
|
|---|
| 389 | /* tok[1] file name */
|
|---|
| 390 | /* tok[2] has to be NULL */
|
|---|
| 391 | char *tok[3];
|
|---|
| 392 | parser_t *parser;
|
|---|
| 393 |
|
|---|
| 394 | parser = config_open2(file ? file : "/etc/syslog.conf",
|
|---|
| 395 | file ? xfopen_for_read : fopen_for_read);
|
|---|
| 396 | if (!parser)
|
|---|
| 397 | /* didn't find default /etc/syslog.conf */
|
|---|
| 398 | /* proceed as if we built busybox without config support */
|
|---|
| 399 | return;
|
|---|
| 400 |
|
|---|
| 401 | /* use ptr to ptr to avoid checking whether head was initialized */
|
|---|
| 402 | pp_rule = &G.log_rules;
|
|---|
| 403 | /* iterate through lines of config, skipping comments */
|
|---|
| 404 | while (config_read(parser, tok, 3, 2, "# \t", PARSE_NORMAL | PARSE_MIN_DIE)) {
|
|---|
| 405 | char *cur_selector;
|
|---|
| 406 | logRule_t *cur_rule;
|
|---|
| 407 |
|
|---|
| 408 | /* unexpected trailing token? */
|
|---|
| 409 | if (tok[2])
|
|---|
| 410 | goto cfgerr;
|
|---|
| 411 |
|
|---|
| 412 | cur_rule = *pp_rule = xzalloc(sizeof(*cur_rule));
|
|---|
| 413 |
|
|---|
| 414 | cur_selector = tok[0];
|
|---|
| 415 | /* iterate through selectors: "kern.info;kern.!err;..." */
|
|---|
| 416 | do {
|
|---|
| 417 | const CODE *code;
|
|---|
| 418 | char *next_selector;
|
|---|
| 419 | uint8_t negated_prio; /* "kern.!err" */
|
|---|
| 420 | uint8_t single_prio; /* "kern.=err" */
|
|---|
| 421 | uint32_t facmap; /* bitmap of enabled facilities */
|
|---|
| 422 | uint8_t primap; /* bitmap of enabled priorities */
|
|---|
| 423 | unsigned i;
|
|---|
| 424 |
|
|---|
| 425 | next_selector = strchr(cur_selector, ';');
|
|---|
| 426 | if (next_selector)
|
|---|
| 427 | *next_selector++ = '\0';
|
|---|
| 428 |
|
|---|
| 429 | t = strchr(cur_selector, '.');
|
|---|
| 430 | if (!t)
|
|---|
| 431 | goto cfgerr;
|
|---|
| 432 | *t++ = '\0'; /* separate facility from priority */
|
|---|
| 433 |
|
|---|
| 434 | negated_prio = 0;
|
|---|
| 435 | single_prio = 0;
|
|---|
| 436 | if (*t == '!') {
|
|---|
| 437 | negated_prio = 1;
|
|---|
| 438 | ++t;
|
|---|
| 439 | }
|
|---|
| 440 | if (*t == '=') {
|
|---|
| 441 | single_prio = 1;
|
|---|
| 442 | ++t;
|
|---|
| 443 | }
|
|---|
| 444 |
|
|---|
| 445 | /* parse priority */
|
|---|
| 446 | if (*t == '*')
|
|---|
| 447 | primap = 0xff; /* all 8 log levels enabled */
|
|---|
| 448 | else {
|
|---|
| 449 | uint8_t priority;
|
|---|
| 450 | code = find_by_name(t, prioritynames);
|
|---|
| 451 | if (!code)
|
|---|
| 452 | goto cfgerr;
|
|---|
| 453 | primap = 0;
|
|---|
| 454 | priority = code->c_val;
|
|---|
| 455 | if (priority == INTERNAL_NOPRI) {
|
|---|
| 456 | /* ensure we take "enabled_facility_priomap[fac] &= 0" branch below */
|
|---|
| 457 | negated_prio = 1;
|
|---|
| 458 | } else {
|
|---|
| 459 | priority = 1 << priority;
|
|---|
| 460 | do {
|
|---|
| 461 | primap |= priority;
|
|---|
| 462 | if (single_prio)
|
|---|
| 463 | break;
|
|---|
| 464 | priority >>= 1;
|
|---|
| 465 | } while (priority);
|
|---|
| 466 | if (negated_prio)
|
|---|
| 467 | primap = ~primap;
|
|---|
| 468 | }
|
|---|
| 469 | }
|
|---|
| 470 |
|
|---|
| 471 | /* parse facility */
|
|---|
| 472 | if (*cur_selector == '*')
|
|---|
| 473 | facmap = (1<<LOG_NFACILITIES) - 1;
|
|---|
| 474 | else {
|
|---|
| 475 | char *next_facility;
|
|---|
| 476 | facmap = 0;
|
|---|
| 477 | t = cur_selector;
|
|---|
| 478 | /* iterate through facilities: "kern,daemon.<priospec>" */
|
|---|
| 479 | do {
|
|---|
| 480 | next_facility = strchr(t, ',');
|
|---|
| 481 | if (next_facility)
|
|---|
| 482 | *next_facility++ = '\0';
|
|---|
| 483 | code = find_by_name(t, facilitynames);
|
|---|
| 484 | if (!code)
|
|---|
| 485 | goto cfgerr;
|
|---|
| 486 | /* "mark" is not a real facility, skip it */
|
|---|
| 487 | if (code->c_val != INTERNAL_MARK)
|
|---|
| 488 | facmap |= 1<<(LOG_FAC(code->c_val));
|
|---|
| 489 | t = next_facility;
|
|---|
| 490 | } while (t);
|
|---|
| 491 | }
|
|---|
| 492 |
|
|---|
| 493 | /* merge result with previous selectors */
|
|---|
| 494 | for (i = 0; i < LOG_NFACILITIES; ++i) {
|
|---|
| 495 | if (!(facmap & (1<<i)))
|
|---|
| 496 | continue;
|
|---|
| 497 | if (negated_prio)
|
|---|
| 498 | cur_rule->enabled_facility_priomap[i] &= primap;
|
|---|
| 499 | else
|
|---|
| 500 | cur_rule->enabled_facility_priomap[i] |= primap;
|
|---|
| 501 | }
|
|---|
| 502 |
|
|---|
| 503 | cur_selector = next_selector;
|
|---|
| 504 | } while (cur_selector);
|
|---|
| 505 |
|
|---|
| 506 | /* check whether current file name was mentioned in previous rules or
|
|---|
| 507 | * as global logfile (G.logFile).
|
|---|
| 508 | */
|
|---|
| 509 | if (strcmp(G.logFile.path, tok[1]) == 0) {
|
|---|
| 510 | cur_rule->file = &G.logFile;
|
|---|
| 511 | goto found;
|
|---|
| 512 | }
|
|---|
| 513 | /* temporarily use cur_rule as iterator, but *pp_rule still points
|
|---|
| 514 | * to currently processing rule entry.
|
|---|
| 515 | * NOTE: *pp_rule points to the current (and last in the list) rule.
|
|---|
| 516 | */
|
|---|
| 517 | for (cur_rule = G.log_rules; cur_rule != *pp_rule; cur_rule = cur_rule->next) {
|
|---|
| 518 | if (strcmp(cur_rule->file->path, tok[1]) == 0) {
|
|---|
| 519 | /* found - reuse the same file structure */
|
|---|
| 520 | (*pp_rule)->file = cur_rule->file;
|
|---|
| 521 | cur_rule = *pp_rule;
|
|---|
| 522 | goto found;
|
|---|
| 523 | }
|
|---|
| 524 | }
|
|---|
| 525 | cur_rule->file = xzalloc(sizeof(*cur_rule->file));
|
|---|
| 526 | cur_rule->file->fd = -1;
|
|---|
| 527 | cur_rule->file->path = xstrdup(tok[1]);
|
|---|
| 528 | found:
|
|---|
| 529 | pp_rule = &cur_rule->next;
|
|---|
| 530 | }
|
|---|
| 531 | config_close(parser);
|
|---|
| 532 | return;
|
|---|
| 533 |
|
|---|
| 534 | cfgerr:
|
|---|
| 535 | bb_error_msg_and_die("error in '%s' at line %d",
|
|---|
| 536 | file ? file : "/etc/syslog.conf",
|
|---|
| 537 | parser->lineno);
|
|---|
| 538 | }
|
|---|
| 539 | #endif
|
|---|
| 540 |
|
|---|
| 541 | /* circular buffer variables/structures */
|
|---|
| 542 | #if ENABLE_FEATURE_IPC_SYSLOG
|
|---|
| 543 |
|
|---|
| 544 | #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
|
|---|
| 545 | #error Sorry, you must set the syslogd buffer size to at least 4KB.
|
|---|
| 546 | #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
|
|---|
| 547 | #endif
|
|---|
| 548 |
|
|---|
| 549 | /* our shared key (syslogd.c and logread.c must be in sync) */
|
|---|
| 550 | enum { KEY_ID = 0x414e4547 }; /* "GENA" */
|
|---|
| 551 |
|
|---|
| 552 | static void ipcsyslog_cleanup(void)
|
|---|
| 553 | {
|
|---|
| 554 | if (G.shmid != -1) {
|
|---|
| 555 | shmdt(G.shbuf);
|
|---|
| 556 | }
|
|---|
| 557 | if (G.shmid != -1) {
|
|---|
| 558 | shmctl(G.shmid, IPC_RMID, NULL);
|
|---|
| 559 | }
|
|---|
| 560 | if (G.s_semid != -1) {
|
|---|
| 561 | semctl(G.s_semid, 0, IPC_RMID, 0);
|
|---|
| 562 | }
|
|---|
| 563 | }
|
|---|
| 564 |
|
|---|
| 565 | static void ipcsyslog_init(void)
|
|---|
| 566 | {
|
|---|
| 567 | if (DEBUG)
|
|---|
| 568 | printf("shmget(%x, %d,...)\n", (int)KEY_ID, G.shm_size);
|
|---|
| 569 |
|
|---|
| 570 | G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644);
|
|---|
| 571 | if (G.shmid == -1) {
|
|---|
| 572 | bb_perror_msg_and_die("shmget");
|
|---|
| 573 | }
|
|---|
| 574 |
|
|---|
| 575 | G.shbuf = shmat(G.shmid, NULL, 0);
|
|---|
| 576 | if (G.shbuf == (void*) -1L) { /* shmat has bizarre error return */
|
|---|
| 577 | bb_perror_msg_and_die("shmat");
|
|---|
| 578 | }
|
|---|
| 579 |
|
|---|
| 580 | memset(G.shbuf, 0, G.shm_size);
|
|---|
| 581 | G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data) - 1;
|
|---|
| 582 | /*G.shbuf->tail = 0;*/
|
|---|
| 583 |
|
|---|
| 584 | /* we'll trust the OS to set initial semval to 0 (let's hope) */
|
|---|
| 585 | G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
|
|---|
| 586 | if (G.s_semid == -1) {
|
|---|
| 587 | if (errno == EEXIST) {
|
|---|
| 588 | G.s_semid = semget(KEY_ID, 2, 0);
|
|---|
| 589 | if (G.s_semid != -1)
|
|---|
| 590 | return;
|
|---|
| 591 | }
|
|---|
| 592 | bb_perror_msg_and_die("semget");
|
|---|
| 593 | }
|
|---|
| 594 | }
|
|---|
| 595 |
|
|---|
| 596 | /* Write message to shared mem buffer */
|
|---|
| 597 | static void log_to_shmem(const char *msg)
|
|---|
| 598 | {
|
|---|
| 599 | int old_tail, new_tail;
|
|---|
| 600 | int len;
|
|---|
| 601 |
|
|---|
| 602 | if (semop(G.s_semid, G.SMwdn, 3) == -1) {
|
|---|
| 603 | bb_perror_msg_and_die("SMwdn");
|
|---|
| 604 | }
|
|---|
| 605 |
|
|---|
| 606 | /* Circular Buffer Algorithm:
|
|---|
| 607 | * --------------------------
|
|---|
| 608 | * tail == position where to store next syslog message.
|
|---|
| 609 | * tail's max value is (shbuf->size - 1)
|
|---|
| 610 | * Last byte of buffer is never used and remains NUL.
|
|---|
| 611 | */
|
|---|
| 612 | len = strlen(msg) + 1; /* length with NUL included */
|
|---|
| 613 | again:
|
|---|
| 614 | old_tail = G.shbuf->tail;
|
|---|
| 615 | new_tail = old_tail + len;
|
|---|
| 616 | if (new_tail < G.shbuf->size) {
|
|---|
| 617 | /* store message, set new tail */
|
|---|
| 618 | memcpy(G.shbuf->data + old_tail, msg, len);
|
|---|
| 619 | G.shbuf->tail = new_tail;
|
|---|
| 620 | } else {
|
|---|
| 621 | /* k == available buffer space ahead of old tail */
|
|---|
| 622 | int k = G.shbuf->size - old_tail;
|
|---|
| 623 | /* copy what fits to the end of buffer, and repeat */
|
|---|
| 624 | memcpy(G.shbuf->data + old_tail, msg, k);
|
|---|
| 625 | msg += k;
|
|---|
| 626 | len -= k;
|
|---|
| 627 | G.shbuf->tail = 0;
|
|---|
| 628 | goto again;
|
|---|
| 629 | }
|
|---|
| 630 | if (semop(G.s_semid, G.SMwup, 1) == -1) {
|
|---|
| 631 | bb_perror_msg_and_die("SMwup");
|
|---|
| 632 | }
|
|---|
| 633 | if (DEBUG)
|
|---|
| 634 | printf("tail:%d\n", G.shbuf->tail);
|
|---|
| 635 | }
|
|---|
| 636 | #else
|
|---|
| 637 | static void ipcsyslog_cleanup(void) {}
|
|---|
| 638 | static void ipcsyslog_init(void) {}
|
|---|
| 639 | void log_to_shmem(const char *msg);
|
|---|
| 640 | #endif /* FEATURE_IPC_SYSLOG */
|
|---|
| 641 |
|
|---|
| 642 | #if ENABLE_FEATURE_KMSG_SYSLOG
|
|---|
| 643 | static void kmsg_init(void)
|
|---|
| 644 | {
|
|---|
| 645 | G.kmsgfd = xopen("/dev/kmsg", O_WRONLY);
|
|---|
| 646 |
|
|---|
| 647 | /*
|
|---|
| 648 | * kernel < 3.5 expects single char printk KERN_* priority prefix,
|
|---|
| 649 | * from 3.5 onwards the full syslog facility/priority format is supported
|
|---|
| 650 | */
|
|---|
| 651 | if (get_linux_version_code() < KERNEL_VERSION(3,5,0))
|
|---|
| 652 | G.primask = LOG_PRIMASK;
|
|---|
| 653 | else
|
|---|
| 654 | G.primask = -1;
|
|---|
| 655 | }
|
|---|
| 656 |
|
|---|
| 657 | static void kmsg_cleanup(void)
|
|---|
| 658 | {
|
|---|
| 659 | if (ENABLE_FEATURE_CLEAN_UP)
|
|---|
| 660 | close(G.kmsgfd);
|
|---|
| 661 | }
|
|---|
| 662 |
|
|---|
| 663 | /* Write message to /dev/kmsg */
|
|---|
| 664 | static void log_to_kmsg(int pri, const char *msg)
|
|---|
| 665 | {
|
|---|
| 666 | /*
|
|---|
| 667 | * kernel < 3.5 expects single char printk KERN_* priority prefix,
|
|---|
| 668 | * from 3.5 onwards the full syslog facility/priority format is supported
|
|---|
| 669 | */
|
|---|
| 670 | pri &= G.primask;
|
|---|
| 671 |
|
|---|
| 672 | full_write(G.kmsgfd, G.printbuf, sprintf(G.printbuf, "<%d>%s\n", pri, msg));
|
|---|
| 673 | }
|
|---|
| 674 | #else
|
|---|
| 675 | static void kmsg_init(void) {}
|
|---|
| 676 | static void kmsg_cleanup(void) {}
|
|---|
| 677 | static void log_to_kmsg(int pri UNUSED_PARAM, const char *msg UNUSED_PARAM) {}
|
|---|
| 678 | #endif /* FEATURE_KMSG_SYSLOG */
|
|---|
| 679 |
|
|---|
| 680 | /* Print a message to the log file. */
|
|---|
| 681 | static void log_locally(time_t now, char *msg, logFile_t *log_file)
|
|---|
| 682 | {
|
|---|
| 683 | #ifdef SYSLOGD_WRLOCK
|
|---|
| 684 | struct flock fl;
|
|---|
| 685 | #endif
|
|---|
| 686 | int len = strlen(msg);
|
|---|
| 687 |
|
|---|
| 688 | /* fd can't be 0 (we connect fd 0 to /dev/log socket) */
|
|---|
| 689 | /* fd is 1 if "-O -" is in use */
|
|---|
| 690 | if (log_file->fd > 1) {
|
|---|
| 691 | /* Reopen log files every second. This allows admin
|
|---|
| 692 | * to delete the files and not worry about restarting us.
|
|---|
| 693 | * This costs almost nothing since it happens
|
|---|
| 694 | * _at most_ once a second for each file, and happens
|
|---|
| 695 | * only when each file is actually written.
|
|---|
| 696 | */
|
|---|
| 697 | if (!now)
|
|---|
| 698 | now = time(NULL);
|
|---|
| 699 | if (log_file->last_log_time != now) {
|
|---|
| 700 | log_file->last_log_time = now;
|
|---|
| 701 | close(log_file->fd);
|
|---|
| 702 | goto reopen;
|
|---|
| 703 | }
|
|---|
| 704 | }
|
|---|
| 705 | else if (log_file->fd == 1) {
|
|---|
| 706 | /* We are logging to stdout: do nothing */
|
|---|
| 707 | }
|
|---|
| 708 | else {
|
|---|
| 709 | if (LONE_DASH(log_file->path)) {
|
|---|
| 710 | log_file->fd = 1;
|
|---|
| 711 | /* log_file->isRegular = 0; - already is */
|
|---|
| 712 | } else {
|
|---|
| 713 | reopen:
|
|---|
| 714 | log_file->fd = open(log_file->path, O_WRONLY | O_CREAT
|
|---|
| 715 | | O_NOCTTY | O_APPEND | O_NONBLOCK,
|
|---|
| 716 | 0666);
|
|---|
| 717 | if (log_file->fd < 0) {
|
|---|
| 718 | /* cannot open logfile? - print to /dev/console then */
|
|---|
| 719 | int fd = device_open(DEV_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
|
|---|
| 720 | if (fd < 0)
|
|---|
| 721 | fd = 2; /* then stderr, dammit */
|
|---|
| 722 | full_write(fd, msg, len);
|
|---|
| 723 | if (fd != 2)
|
|---|
| 724 | close(fd);
|
|---|
| 725 | return;
|
|---|
| 726 | }
|
|---|
| 727 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
|---|
| 728 | {
|
|---|
| 729 | struct stat statf;
|
|---|
| 730 | log_file->isRegular = (fstat(log_file->fd, &statf) == 0 && S_ISREG(statf.st_mode));
|
|---|
| 731 | /* bug (mostly harmless): can wrap around if file > 4gb */
|
|---|
| 732 | log_file->size = statf.st_size;
|
|---|
| 733 | }
|
|---|
| 734 | #endif
|
|---|
| 735 | }
|
|---|
| 736 | }
|
|---|
| 737 |
|
|---|
| 738 | #ifdef SYSLOGD_WRLOCK
|
|---|
| 739 | fl.l_whence = SEEK_SET;
|
|---|
| 740 | fl.l_start = 0;
|
|---|
| 741 | fl.l_len = 1;
|
|---|
| 742 | fl.l_type = F_WRLCK;
|
|---|
| 743 | fcntl(log_file->fd, F_SETLKW, &fl);
|
|---|
| 744 | #endif
|
|---|
| 745 |
|
|---|
| 746 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
|---|
| 747 | if (G.logFileSize && log_file->isRegular && log_file->size > G.logFileSize) {
|
|---|
| 748 | if (G.logFileRotate) { /* always 0..99 */
|
|---|
| 749 | int i = strlen(log_file->path) + 3 + 1;
|
|---|
| 750 | char oldFile[i];
|
|---|
| 751 | char newFile[i];
|
|---|
| 752 | i = G.logFileRotate - 1;
|
|---|
| 753 | /* rename: f.8 -> f.9; f.7 -> f.8; ... */
|
|---|
| 754 | while (1) {
|
|---|
| 755 | sprintf(newFile, "%s.%d", log_file->path, i);
|
|---|
| 756 | if (i == 0) break;
|
|---|
| 757 | sprintf(oldFile, "%s.%d", log_file->path, --i);
|
|---|
| 758 | /* ignore errors - file might be missing */
|
|---|
| 759 | rename(oldFile, newFile);
|
|---|
| 760 | }
|
|---|
| 761 | /* newFile == "f.0" now */
|
|---|
| 762 | rename(log_file->path, newFile);
|
|---|
| 763 | }
|
|---|
| 764 |
|
|---|
| 765 | /* We may or may not have just renamed the file away;
|
|---|
| 766 | * if we didn't rename because we aren't keeping any backlog,
|
|---|
| 767 | * then it's time to clobber the file. If we did rename it...,
|
|---|
| 768 | * incredibly, if F and F.0 are hardlinks, POSIX _demands_
|
|---|
| 769 | * that rename returns 0 but does not remove F!!!
|
|---|
| 770 | * (hardlinked F/F.0 pair was observed after
|
|---|
| 771 | * power failure during rename()).
|
|---|
| 772 | * So ensure old file is gone in any case:
|
|---|
| 773 | */
|
|---|
| 774 | unlink(log_file->path);
|
|---|
| 775 | #ifdef SYSLOGD_WRLOCK
|
|---|
| 776 | fl.l_type = F_UNLCK;
|
|---|
| 777 | fcntl(log_file->fd, F_SETLKW, &fl);
|
|---|
| 778 | #endif
|
|---|
| 779 | close(log_file->fd);
|
|---|
| 780 | goto reopen;
|
|---|
| 781 | }
|
|---|
| 782 | /* TODO: what to do on write errors ("disk full")? */
|
|---|
| 783 | len = full_write(log_file->fd, msg, len);
|
|---|
| 784 | if (len > 0)
|
|---|
| 785 | log_file->size += len;
|
|---|
| 786 | #else
|
|---|
| 787 | full_write(log_file->fd, msg, len);
|
|---|
| 788 | #endif
|
|---|
| 789 |
|
|---|
| 790 | #ifdef SYSLOGD_WRLOCK
|
|---|
| 791 | fl.l_type = F_UNLCK;
|
|---|
| 792 | fcntl(log_file->fd, F_SETLKW, &fl);
|
|---|
| 793 | #endif
|
|---|
| 794 | }
|
|---|
| 795 |
|
|---|
| 796 | static void parse_fac_prio_20(int pri, char *res20)
|
|---|
| 797 | {
|
|---|
| 798 | const CODE *c_pri, *c_fac;
|
|---|
| 799 |
|
|---|
| 800 | c_fac = find_by_val(LOG_FAC(pri) << 3, facilitynames);
|
|---|
| 801 | if (c_fac) {
|
|---|
| 802 | c_pri = find_by_val(LOG_PRI(pri), prioritynames);
|
|---|
| 803 | if (c_pri) {
|
|---|
| 804 | snprintf(res20, 20, "%s.%s", c_fac->c_name, c_pri->c_name);
|
|---|
| 805 | return;
|
|---|
| 806 | }
|
|---|
| 807 | }
|
|---|
| 808 | snprintf(res20, 20, "<%d>", pri);
|
|---|
| 809 | }
|
|---|
| 810 |
|
|---|
| 811 | /* len parameter is used only for "is there a timestamp?" check.
|
|---|
| 812 | * NB: some callers cheat and supply len==0 when they know
|
|---|
| 813 | * that there is no timestamp, short-circuiting the test. */
|
|---|
| 814 | static void timestamp_and_log(int pri, char *msg, int len)
|
|---|
| 815 | {
|
|---|
| 816 | char *timestamp;
|
|---|
| 817 | time_t now;
|
|---|
| 818 |
|
|---|
| 819 | /* Jan 18 00:11:22 msg... */
|
|---|
| 820 | /* 01234567890123456 */
|
|---|
| 821 | if (len < 16 || msg[3] != ' ' || msg[6] != ' '
|
|---|
| 822 | || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
|
|---|
| 823 | ) {
|
|---|
| 824 | time(&now);
|
|---|
| 825 | timestamp = ctime(&now) + 4; /* skip day of week */
|
|---|
| 826 | } else {
|
|---|
| 827 | now = 0;
|
|---|
| 828 | timestamp = msg;
|
|---|
| 829 | msg += 16;
|
|---|
| 830 | }
|
|---|
| 831 | timestamp[15] = '\0';
|
|---|
| 832 |
|
|---|
| 833 | if (option_mask32 & OPT_kmsg) {
|
|---|
| 834 | log_to_kmsg(pri, msg);
|
|---|
| 835 | return;
|
|---|
| 836 | }
|
|---|
| 837 |
|
|---|
| 838 | if (option_mask32 & OPT_small)
|
|---|
| 839 | sprintf(G.printbuf, "%s %s\n", timestamp, msg);
|
|---|
| 840 | else {
|
|---|
| 841 | char res[20];
|
|---|
| 842 | parse_fac_prio_20(pri, res);
|
|---|
| 843 | sprintf(G.printbuf, "%s %.64s %s %s\n", timestamp, G.hostname, res, msg);
|
|---|
| 844 | }
|
|---|
| 845 |
|
|---|
| 846 | /* Log message locally (to file or shared mem) */
|
|---|
| 847 | #if ENABLE_FEATURE_SYSLOGD_CFG
|
|---|
| 848 | {
|
|---|
| 849 | bool match = 0;
|
|---|
| 850 | logRule_t *rule;
|
|---|
| 851 | uint8_t facility = LOG_FAC(pri);
|
|---|
| 852 | uint8_t prio_bit = 1 << LOG_PRI(pri);
|
|---|
| 853 |
|
|---|
| 854 | for (rule = G.log_rules; rule; rule = rule->next) {
|
|---|
| 855 | if (rule->enabled_facility_priomap[facility] & prio_bit) {
|
|---|
| 856 | log_locally(now, G.printbuf, rule->file);
|
|---|
| 857 | match = 1;
|
|---|
| 858 | }
|
|---|
| 859 | }
|
|---|
| 860 | if (match)
|
|---|
| 861 | return;
|
|---|
| 862 | }
|
|---|
| 863 | #endif
|
|---|
| 864 | if (LOG_PRI(pri) < G.logLevel) {
|
|---|
| 865 | #if ENABLE_FEATURE_IPC_SYSLOG
|
|---|
| 866 | if ((option_mask32 & OPT_circularlog) && G.shbuf) {
|
|---|
| 867 | log_to_shmem(G.printbuf);
|
|---|
| 868 | return;
|
|---|
| 869 | }
|
|---|
| 870 | #endif
|
|---|
| 871 | log_locally(now, G.printbuf, &G.logFile);
|
|---|
| 872 | }
|
|---|
| 873 | }
|
|---|
| 874 |
|
|---|
| 875 | static void timestamp_and_log_internal(const char *msg)
|
|---|
| 876 | {
|
|---|
| 877 | /* -L, or no -R */
|
|---|
| 878 | if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog))
|
|---|
| 879 | return;
|
|---|
| 880 | timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)msg, 0);
|
|---|
| 881 | }
|
|---|
| 882 |
|
|---|
| 883 | /* tmpbuf[len] is a NUL byte (set by caller), but there can be other,
|
|---|
| 884 | * embedded NULs. Split messages on each of these NULs, parse prio,
|
|---|
| 885 | * escape control chars and log each locally. */
|
|---|
| 886 | static void split_escape_and_log(char *tmpbuf, int len)
|
|---|
| 887 | {
|
|---|
| 888 | char *p = tmpbuf;
|
|---|
| 889 |
|
|---|
| 890 | tmpbuf += len;
|
|---|
| 891 | while (p < tmpbuf) {
|
|---|
| 892 | char c;
|
|---|
| 893 | char *q = G.parsebuf;
|
|---|
| 894 | int pri = (LOG_USER | LOG_NOTICE);
|
|---|
| 895 |
|
|---|
| 896 | if (*p == '<') {
|
|---|
| 897 | /* Parse the magic priority number */
|
|---|
| 898 | pri = bb_strtou(p + 1, &p, 10);
|
|---|
| 899 | if (*p == '>')
|
|---|
| 900 | p++;
|
|---|
| 901 | if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
|
|---|
| 902 | pri = (LOG_USER | LOG_NOTICE);
|
|---|
| 903 | }
|
|---|
| 904 |
|
|---|
| 905 | while ((c = *p++)) {
|
|---|
| 906 | if (c == '\n')
|
|---|
| 907 | c = ' ';
|
|---|
| 908 | if (!(c & ~0x1f) && c != '\t') {
|
|---|
| 909 | *q++ = '^';
|
|---|
| 910 | c += '@'; /* ^@, ^A, ^B... */
|
|---|
| 911 | }
|
|---|
| 912 | *q++ = c;
|
|---|
| 913 | }
|
|---|
| 914 | *q = '\0';
|
|---|
| 915 |
|
|---|
| 916 | /* Now log it */
|
|---|
| 917 | timestamp_and_log(pri, G.parsebuf, q - G.parsebuf);
|
|---|
| 918 | }
|
|---|
| 919 | }
|
|---|
| 920 |
|
|---|
| 921 | #ifdef SYSLOGD_MARK
|
|---|
| 922 | static void do_mark(int sig)
|
|---|
| 923 | {
|
|---|
| 924 | if (G.markInterval) {
|
|---|
| 925 | timestamp_and_log_internal("-- MARK --");
|
|---|
| 926 | alarm(G.markInterval);
|
|---|
| 927 | }
|
|---|
| 928 | }
|
|---|
| 929 | #endif
|
|---|
| 930 |
|
|---|
| 931 | /* Don't inline: prevent struct sockaddr_un to take up space on stack
|
|---|
| 932 | * permanently */
|
|---|
| 933 | static NOINLINE int create_socket(void)
|
|---|
| 934 | {
|
|---|
| 935 | struct sockaddr_un sunx;
|
|---|
| 936 | int sock_fd;
|
|---|
| 937 | char *dev_log_name;
|
|---|
| 938 |
|
|---|
| 939 | memset(&sunx, 0, sizeof(sunx));
|
|---|
| 940 | sunx.sun_family = AF_UNIX;
|
|---|
| 941 |
|
|---|
| 942 | /* Unlink old /dev/log or object it points to. */
|
|---|
| 943 | /* (if it exists, bind will fail) */
|
|---|
| 944 | strcpy(sunx.sun_path, _PATH_LOG);
|
|---|
| 945 | dev_log_name = xmalloc_follow_symlinks(_PATH_LOG);
|
|---|
| 946 | if (dev_log_name) {
|
|---|
| 947 | safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
|
|---|
| 948 | free(dev_log_name);
|
|---|
| 949 | }
|
|---|
| 950 | unlink(sunx.sun_path);
|
|---|
| 951 |
|
|---|
| 952 | sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
|
|---|
| 953 | xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
|
|---|
| 954 | chmod(_PATH_LOG, 0666);
|
|---|
| 955 |
|
|---|
| 956 | return sock_fd;
|
|---|
| 957 | }
|
|---|
| 958 |
|
|---|
| 959 | #if ENABLE_FEATURE_REMOTE_LOG
|
|---|
| 960 | static int try_to_resolve_remote(remoteHost_t *rh)
|
|---|
| 961 | {
|
|---|
| 962 | if (!rh->remoteAddr) {
|
|---|
| 963 | unsigned now = monotonic_sec();
|
|---|
| 964 |
|
|---|
| 965 | /* Don't resolve name too often - DNS timeouts can be big */
|
|---|
| 966 | if ((now - rh->last_dns_resolve) < DNS_WAIT_SEC)
|
|---|
| 967 | return -1;
|
|---|
| 968 | rh->last_dns_resolve = now;
|
|---|
| 969 | rh->remoteAddr = host2sockaddr(rh->remoteHostname, 514);
|
|---|
| 970 | if (!rh->remoteAddr)
|
|---|
| 971 | return -1;
|
|---|
| 972 | }
|
|---|
| 973 | return xsocket(rh->remoteAddr->u.sa.sa_family, SOCK_DGRAM, 0);
|
|---|
| 974 | }
|
|---|
| 975 | #endif
|
|---|
| 976 |
|
|---|
| 977 | static void do_syslogd(void) NORETURN;
|
|---|
| 978 | static void do_syslogd(void)
|
|---|
| 979 | {
|
|---|
| 980 | #if ENABLE_FEATURE_REMOTE_LOG
|
|---|
| 981 | llist_t *item;
|
|---|
| 982 | #endif
|
|---|
| 983 | #if ENABLE_FEATURE_SYSLOGD_DUP
|
|---|
| 984 | int last_sz = -1;
|
|---|
| 985 | char *last_buf;
|
|---|
| 986 | char *recvbuf = G.recvbuf;
|
|---|
| 987 | #else
|
|---|
| 988 | #define recvbuf (G.recvbuf)
|
|---|
| 989 | #endif
|
|---|
| 990 |
|
|---|
| 991 | /* Set up signal handlers (so that they interrupt read()) */
|
|---|
| 992 | signal_no_SA_RESTART_empty_mask(SIGTERM, record_signo);
|
|---|
| 993 | signal_no_SA_RESTART_empty_mask(SIGINT, record_signo);
|
|---|
| 994 | //signal_no_SA_RESTART_empty_mask(SIGQUIT, record_signo);
|
|---|
| 995 | signal(SIGHUP, SIG_IGN);
|
|---|
| 996 | #ifdef SYSLOGD_MARK
|
|---|
| 997 | signal(SIGALRM, do_mark);
|
|---|
| 998 | alarm(G.markInterval);
|
|---|
| 999 | #endif
|
|---|
| 1000 | xmove_fd(create_socket(), STDIN_FILENO);
|
|---|
| 1001 |
|
|---|
| 1002 | if (option_mask32 & OPT_circularlog)
|
|---|
| 1003 | ipcsyslog_init();
|
|---|
| 1004 |
|
|---|
| 1005 | if (option_mask32 & OPT_kmsg)
|
|---|
| 1006 | kmsg_init();
|
|---|
| 1007 |
|
|---|
| 1008 | timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER);
|
|---|
| 1009 |
|
|---|
| 1010 | while (!bb_got_signal) {
|
|---|
| 1011 | ssize_t sz;
|
|---|
| 1012 |
|
|---|
| 1013 | #if ENABLE_FEATURE_SYSLOGD_DUP
|
|---|
| 1014 | last_buf = recvbuf;
|
|---|
| 1015 | if (recvbuf == G.recvbuf)
|
|---|
| 1016 | recvbuf = G.recvbuf + MAX_READ;
|
|---|
| 1017 | else
|
|---|
| 1018 | recvbuf = G.recvbuf;
|
|---|
| 1019 | #endif
|
|---|
| 1020 | read_again:
|
|---|
| 1021 | sz = read(STDIN_FILENO, recvbuf, MAX_READ - 1);
|
|---|
| 1022 | if (sz < 0) {
|
|---|
| 1023 | if (!bb_got_signal)
|
|---|
| 1024 | bb_perror_msg("read from %s", _PATH_LOG);
|
|---|
| 1025 | break;
|
|---|
| 1026 | }
|
|---|
| 1027 |
|
|---|
| 1028 | /* Drop trailing '\n' and NULs (typically there is one NUL) */
|
|---|
| 1029 | while (1) {
|
|---|
| 1030 | if (sz == 0)
|
|---|
| 1031 | goto read_again;
|
|---|
| 1032 | /* man 3 syslog says: "A trailing newline is added when needed".
|
|---|
| 1033 | * However, neither glibc nor uclibc do this:
|
|---|
| 1034 | * syslog(prio, "test") sends "test\0" to /dev/log,
|
|---|
| 1035 | * syslog(prio, "test\n") sends "test\n\0".
|
|---|
| 1036 | * IOW: newline is passed verbatim!
|
|---|
| 1037 | * I take it to mean that it's syslogd's job
|
|---|
| 1038 | * to make those look identical in the log files. */
|
|---|
| 1039 | if (recvbuf[sz-1] != '\0' && recvbuf[sz-1] != '\n')
|
|---|
| 1040 | break;
|
|---|
| 1041 | sz--;
|
|---|
| 1042 | }
|
|---|
| 1043 | #if ENABLE_FEATURE_SYSLOGD_DUP
|
|---|
| 1044 | if ((option_mask32 & OPT_dup) && (sz == last_sz))
|
|---|
| 1045 | if (memcmp(last_buf, recvbuf, sz) == 0)
|
|---|
| 1046 | continue;
|
|---|
| 1047 | last_sz = sz;
|
|---|
| 1048 | #endif
|
|---|
| 1049 | #if ENABLE_FEATURE_REMOTE_LOG
|
|---|
| 1050 | /* Stock syslogd sends it '\n'-terminated
|
|---|
| 1051 | * over network, mimic that */
|
|---|
| 1052 | recvbuf[sz] = '\n';
|
|---|
| 1053 |
|
|---|
| 1054 | /* We are not modifying log messages in any way before send */
|
|---|
| 1055 | /* Remote site cannot trust _us_ anyway and need to do validation again */
|
|---|
| 1056 | for (item = G.remoteHosts; item != NULL; item = item->link) {
|
|---|
| 1057 | remoteHost_t *rh = (remoteHost_t *)item->data;
|
|---|
| 1058 |
|
|---|
| 1059 | if (rh->remoteFD == -1) {
|
|---|
| 1060 | rh->remoteFD = try_to_resolve_remote(rh);
|
|---|
| 1061 | if (rh->remoteFD == -1)
|
|---|
| 1062 | continue;
|
|---|
| 1063 | }
|
|---|
| 1064 |
|
|---|
| 1065 | /* Send message to remote logger.
|
|---|
| 1066 | * On some errors, close and set remoteFD to -1
|
|---|
| 1067 | * so that DNS resolution is retried.
|
|---|
| 1068 | */
|
|---|
| 1069 | if (sendto(rh->remoteFD, recvbuf, sz+1,
|
|---|
| 1070 | MSG_DONTWAIT | MSG_NOSIGNAL,
|
|---|
| 1071 | &(rh->remoteAddr->u.sa), rh->remoteAddr->len) == -1
|
|---|
| 1072 | ) {
|
|---|
| 1073 | switch (errno) {
|
|---|
| 1074 | case ECONNRESET:
|
|---|
| 1075 | case ENOTCONN: /* paranoia */
|
|---|
| 1076 | case EPIPE:
|
|---|
| 1077 | close(rh->remoteFD);
|
|---|
| 1078 | rh->remoteFD = -1;
|
|---|
| 1079 | free(rh->remoteAddr);
|
|---|
| 1080 | rh->remoteAddr = NULL;
|
|---|
| 1081 | }
|
|---|
| 1082 | }
|
|---|
| 1083 | }
|
|---|
| 1084 | #endif
|
|---|
| 1085 | if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
|
|---|
| 1086 | recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */
|
|---|
| 1087 | split_escape_and_log(recvbuf, sz);
|
|---|
| 1088 | }
|
|---|
| 1089 | } /* while (!bb_got_signal) */
|
|---|
| 1090 |
|
|---|
| 1091 | timestamp_and_log_internal("syslogd exiting");
|
|---|
| 1092 | remove_pidfile(CONFIG_PID_FILE_PATH "/syslogd.pid");
|
|---|
| 1093 | ipcsyslog_cleanup();
|
|---|
| 1094 | if (option_mask32 & OPT_kmsg)
|
|---|
| 1095 | kmsg_cleanup();
|
|---|
| 1096 | kill_myself_with_sig(bb_got_signal);
|
|---|
| 1097 | #undef recvbuf
|
|---|
| 1098 | }
|
|---|
| 1099 |
|
|---|
| 1100 | int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|---|
| 1101 | int syslogd_main(int argc UNUSED_PARAM, char **argv)
|
|---|
| 1102 | {
|
|---|
| 1103 | int opts;
|
|---|
| 1104 | char OPTION_DECL;
|
|---|
| 1105 | #if ENABLE_FEATURE_REMOTE_LOG
|
|---|
| 1106 | llist_t *remoteAddrList = NULL;
|
|---|
| 1107 | #endif
|
|---|
| 1108 |
|
|---|
| 1109 | INIT_G();
|
|---|
| 1110 |
|
|---|
| 1111 | /* No non-option params, -R can occur multiple times */
|
|---|
| 1112 | opt_complementary = "=0" IF_FEATURE_REMOTE_LOG(":R::");
|
|---|
| 1113 | opts = getopt32(argv, OPTION_STR, OPTION_PARAM);
|
|---|
| 1114 | #if ENABLE_FEATURE_REMOTE_LOG
|
|---|
| 1115 | while (remoteAddrList) {
|
|---|
| 1116 | remoteHost_t *rh = xzalloc(sizeof(*rh));
|
|---|
| 1117 | rh->remoteHostname = llist_pop(&remoteAddrList);
|
|---|
| 1118 | rh->remoteFD = -1;
|
|---|
| 1119 | rh->last_dns_resolve = monotonic_sec() - DNS_WAIT_SEC - 1;
|
|---|
| 1120 | llist_add_to(&G.remoteHosts, rh);
|
|---|
| 1121 | }
|
|---|
| 1122 | #endif
|
|---|
| 1123 |
|
|---|
| 1124 | #ifdef SYSLOGD_MARK
|
|---|
| 1125 | if (opts & OPT_mark) // -m
|
|---|
| 1126 | G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
|
|---|
| 1127 | #endif
|
|---|
| 1128 | //if (opts & OPT_nofork) // -n
|
|---|
| 1129 | //if (opts & OPT_outfile) // -O
|
|---|
| 1130 | if (opts & OPT_loglevel) // -l
|
|---|
| 1131 | G.logLevel = xatou_range(opt_l, 1, 8);
|
|---|
| 1132 | //if (opts & OPT_small) // -S
|
|---|
| 1133 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
|---|
| 1134 | if (opts & OPT_filesize) // -s
|
|---|
| 1135 | G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
|
|---|
| 1136 | if (opts & OPT_rotatecnt) // -b
|
|---|
| 1137 | G.logFileRotate = xatou_range(opt_b, 0, 99);
|
|---|
| 1138 | #endif
|
|---|
| 1139 | #if ENABLE_FEATURE_IPC_SYSLOG
|
|---|
| 1140 | if (opt_C) // -Cn
|
|---|
| 1141 | G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
|
|---|
| 1142 | #endif
|
|---|
| 1143 | /* If they have not specified remote logging, then log locally */
|
|---|
| 1144 | if (ENABLE_FEATURE_REMOTE_LOG && !(opts & OPT_remotelog)) // -R
|
|---|
| 1145 | option_mask32 |= OPT_locallog;
|
|---|
| 1146 | #if ENABLE_FEATURE_SYSLOGD_CFG
|
|---|
| 1147 | parse_syslogdcfg(opt_f);
|
|---|
| 1148 | #endif
|
|---|
| 1149 |
|
|---|
| 1150 | /* Store away localhost's name before the fork */
|
|---|
| 1151 | G.hostname = safe_gethostname();
|
|---|
| 1152 | *strchrnul(G.hostname, '.') = '\0';
|
|---|
| 1153 |
|
|---|
| 1154 | if (!(opts & OPT_nofork)) {
|
|---|
| 1155 | bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
|
|---|
| 1156 | }
|
|---|
| 1157 |
|
|---|
| 1158 | //umask(0); - why??
|
|---|
| 1159 | write_pidfile(CONFIG_PID_FILE_PATH "/syslogd.pid");
|
|---|
| 1160 |
|
|---|
| 1161 | do_syslogd();
|
|---|
| 1162 | /* return EXIT_SUCCESS; */
|
|---|
| 1163 | }
|
|---|
| 1164 |
|
|---|
| 1165 | /* Clean up. Needed because we are included from syslogd_and_logger.c */
|
|---|
| 1166 | #undef DEBUG
|
|---|
| 1167 | #undef SYSLOGD_MARK
|
|---|
| 1168 | #undef SYSLOGD_WRLOCK
|
|---|
| 1169 | #undef G
|
|---|
| 1170 | #undef GLOBALS
|
|---|
| 1171 | #undef INIT_G
|
|---|
| 1172 | #undef OPTION_STR
|
|---|
| 1173 | #undef OPTION_DECL
|
|---|
| 1174 | #undef OPTION_PARAM
|
|---|
