blob: 3fe3f5348bd9418ac70c198352b2118ee3d19ab6 [file] [log] [blame]
Erik Andersene49d5ec2000-02-08 19:58:47 +00001/* vi: set sw=4 ts=4: */
Eric Andersen3843e961999-11-25 07:30:46 +00002/*
3 * Mini syslogd implementation for busybox
4 *
Eric Andersenc7bda1c2004-03-15 08:29:22 +00005 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
Eric Andersen3843e961999-11-25 07:30:46 +00006 *
Erik Andersenf13df372000-04-18 23:51:51 +00007 * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
8 *
Glenn L McGrath6ed77592002-12-12 10:54:48 +00009 * "circular buffer" Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>
Mark Whitley6317c4b2001-03-12 22:51:50 +000010 *
Glenn L McGrath6ed77592002-12-12 10:54:48 +000011 * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
Mark Whitley6bff9cc2001-03-12 23:41:34 +000012 *
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +020013 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
Eric Andersen3843e961999-11-25 07:30:46 +000014 */
Eric Andersenb99df0f1999-11-24 09:04:33 +000015
Pere Orga5bc8c002011-04-11 03:29:49 +020016//usage:#define syslogd_trivial_usage
17//usage: "[OPTIONS]"
18//usage:#define syslogd_full_usage "\n\n"
Denys Vlasenkoaeab42e2011-05-25 11:58:56 +020019//usage: "System logging utility\n"
20//usage: IF_NOT_FEATURE_SYSLOGD_CFG(
21//usage: "(this version of syslogd ignores /etc/syslog.conf)\n"
22//usage: )
Pere Orga5bc8c002011-04-11 03:29:49 +020023//usage: "\n -n Run in foreground"
Denys Vlasenkoaeab42e2011-05-25 11:58:56 +020024//usage: "\n -O FILE Log to FILE (default:/var/log/messages)"
25//usage: "\n -l N Log only messages more urgent than prio N (1-8)"
26//usage: "\n -S Smaller output"
Pere Orga5bc8c002011-04-11 03:29:49 +020027//usage: IF_FEATURE_ROTATE_LOGFILE(
Denys Vlasenkoaeab42e2011-05-25 11:58:56 +020028//usage: "\n -s SIZE Max size (KB) before rotation (default:200KB, 0=off)"
29//usage: "\n -b N N rotated logs to keep (default:1, max=99, 0=purge)"
30//usage: )
Pere Orga5bc8c002011-04-11 03:29:49 +020031//usage: IF_FEATURE_REMOTE_LOG(
32//usage: "\n -R HOST[:PORT] Log to IP or hostname on PORT (default PORT=514/UDP)"
Denys Vlasenkoaeab42e2011-05-25 11:58:56 +020033//usage: "\n -L Log locally and via network (default is network only if -R)"
34//usage: )
Pere Orga5bc8c002011-04-11 03:29:49 +020035//usage: IF_FEATURE_SYSLOGD_DUP(
Denys Vlasenkoaeab42e2011-05-25 11:58:56 +020036//usage: "\n -D Drop duplicates"
37//usage: )
Pere Orga5bc8c002011-04-11 03:29:49 +020038//usage: IF_FEATURE_IPC_SYSLOG(
Pere Orga5bc8c002011-04-11 03:29:49 +020039/* NB: -Csize shouldn't have space (because size is optional) */
Denys Vlasenkoaeab42e2011-05-25 11:58:56 +020040//usage: "\n -C[size_kb] Log to shared mem buffer (use logread to read it)"
41//usage: )
42//usage: IF_FEATURE_SYSLOGD_CFG(
43//usage: "\n -f FILE Use FILE as config (default:/etc/syslog.conf)"
44//usage: )
Pere Orga5bc8c002011-04-11 03:29:49 +020045/* //usage: "\n -m MIN Minutes between MARK lines (default:20, 0=off)" */
Peter Korsgaardcd776cf2013-01-06 00:07:19 +010046//usage: IF_FEATURE_KMSG_SYSLOG(
47//usage: "\n -K Log to kernel printk buffer (use dmesg to read it)"
48//usage: )
Pere Orga5bc8c002011-04-11 03:29:49 +020049//usage:
50//usage:#define syslogd_example_usage
51//usage: "$ syslogd -R masterlog:514\n"
52//usage: "$ syslogd -R 192.168.1.1:601\n"
53
Denis Vlasenkobd1aeeb2008-06-11 15:43:19 +000054/*
55 * Done in syslogd_and_logger.c:
Denis Vlasenkob6adbf12007-05-26 19:00:18 +000056#include "libbb.h"
Bernhard Reutner-Fischerf4701962008-01-27 12:50:12 +000057#define SYSLOG_NAMES
58#define SYSLOG_NAMES_CONST
59#include <syslog.h>
Denis Vlasenkobd1aeeb2008-06-11 15:43:19 +000060*/
Bernhard Reutner-Fischerf4701962008-01-27 12:50:12 +000061
Erik Andersen983b51b2000-04-04 18:14:25 +000062#include <sys/un.h>
Eric Andersenced2cef2000-07-20 23:41:24 +000063#include <sys/uio.h>
Eric Andersen3843e961999-11-25 07:30:46 +000064
Denis Vlasenko5e892ba2007-03-15 19:50:46 +000065#if ENABLE_FEATURE_REMOTE_LOG
66#include <netinet/in.h>
Denis Vlasenko4998c812007-02-14 20:51:46 +000067#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +000068
Denis Vlasenko5e892ba2007-03-15 19:50:46 +000069#if ENABLE_FEATURE_IPC_SYSLOG
70#include <sys/ipc.h>
71#include <sys/sem.h>
72#include <sys/shm.h>
73#endif
Denis Vlasenko1decd0e2006-09-30 19:17:40 +000074
Denis Vlasenko5e892ba2007-03-15 19:50:46 +000075
76#define DEBUG 0
77
Denis Vlasenko4f93cde2007-03-20 20:03:03 +000078/* MARK code is not very useful, is bloat, and broken:
79 * can deadlock if alarmed to make MARK while writing to IPC buffer
80 * (semaphores are down but do_mark routine tries to down them again) */
81#undef SYSLOGD_MARK
82
Denis Vlasenko0d948202008-12-09 22:53:31 +000083/* Write locking does not seem to be useful either */
84#undef SYSLOGD_WRLOCK
85
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +000086enum {
Janne Kiviluotoc897dfe2010-03-31 15:58:58 +020087 MAX_READ = CONFIG_FEATURE_SYSLOGD_READ_BUFFER_SIZE,
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +000088 DNS_WAIT_SEC = 2 * 60,
89};
Denis Vlasenko4f93cde2007-03-20 20:03:03 +000090
91/* Semaphore operation structures */
Denis Vlasenko5e892ba2007-03-15 19:50:46 +000092struct shbuf_ds {
Denis Vlasenko5f1b1492007-08-12 21:33:06 +000093 int32_t size; /* size of data - 1 */
Denis Vlasenko4f93cde2007-03-20 20:03:03 +000094 int32_t tail; /* end of message list */
95 char data[1]; /* data/messages */
96};
97
Thomas Geuligd2f77792010-02-28 13:01:59 +010098#if ENABLE_FEATURE_REMOTE_LOG
99typedef struct {
100 int remoteFD;
101 unsigned last_dns_resolve;
102 len_and_sockaddr *remoteAddr;
103 const char *remoteHostname;
104} remoteHost_t;
105#endif
106
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200107typedef struct logFile_t {
108 const char *path;
109 int fd;
110#if ENABLE_FEATURE_ROTATE_LOGFILE
111 unsigned size;
112 uint8_t isRegular;
113#endif
114} logFile_t;
115
116#if ENABLE_FEATURE_SYSLOGD_CFG
117typedef struct logRule_t {
118 uint8_t enabled_facility_priomap[LOG_NFACILITIES];
119 struct logFile_t *file;
120 struct logRule_t *next;
121} logRule_t;
122#endif
123
Denis Vlasenko4f93cde2007-03-20 20:03:03 +0000124/* Allows us to have smaller initializer. Ugly. */
125#define GLOBALS \
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200126 logFile_t logFile; \
Denis Vlasenko4f93cde2007-03-20 20:03:03 +0000127 /* interval between marks in seconds */ \
128 /*int markInterval;*/ \
129 /* level of messages to be logged */ \
130 int logLevel; \
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000131IF_FEATURE_ROTATE_LOGFILE( \
Denis Vlasenko4f93cde2007-03-20 20:03:03 +0000132 /* max size of file before rotation */ \
133 unsigned logFileSize; \
134 /* number of rotated message files */ \
135 unsigned logFileRotate; \
Denis Vlasenko4f93cde2007-03-20 20:03:03 +0000136) \
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000137IF_FEATURE_IPC_SYSLOG( \
Denis Vlasenko4f93cde2007-03-20 20:03:03 +0000138 int shmid; /* ipc shared memory id */ \
139 int s_semid; /* ipc semaphore id */ \
140 int shm_size; \
141 struct sembuf SMwup[1]; \
142 struct sembuf SMwdn[3]; \
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200143) \
144IF_FEATURE_SYSLOGD_CFG( \
145 logRule_t *log_rules; \
Peter Korsgaardcd776cf2013-01-06 00:07:19 +0100146) \
147IF_FEATURE_KMSG_SYSLOG( \
148 int kmsgfd; \
149 int primask; \
Denis Vlasenko4f93cde2007-03-20 20:03:03 +0000150)
151
152struct init_globals {
153 GLOBALS
154};
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000155
156struct globals {
Denis Vlasenko4f93cde2007-03-20 20:03:03 +0000157 GLOBALS
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +0000158
159#if ENABLE_FEATURE_REMOTE_LOG
Thomas Geuligd2f77792010-02-28 13:01:59 +0100160 llist_t *remoteHosts;
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +0000161#endif
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000162#if ENABLE_FEATURE_IPC_SYSLOG
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000163 struct shbuf_ds *shbuf;
164#endif
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000165 time_t last_log_time;
Denis Vlasenko6f1713f2008-02-25 23:23:58 +0000166 /* localhost's name. We print only first 64 chars */
167 char *hostname;
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000168
Denis Vlasenko4f93cde2007-03-20 20:03:03 +0000169 /* We recv into recvbuf... */
Denis Vlasenkobe048f22008-02-26 20:13:52 +0000170 char recvbuf[MAX_READ * (1 + ENABLE_FEATURE_SYSLOGD_DUP)];
Denis Vlasenko4f93cde2007-03-20 20:03:03 +0000171 /* ...then copy to parsebuf, escaping control chars */
172 /* (can grow x2 max) */
173 char parsebuf[MAX_READ*2];
174 /* ...then sprintf into printbuf, adding timestamp (15 chars),
175 * host (64), fac.prio (20) to the message */
176 /* (growth by: 15 + 64 + 20 + delims = ~110) */
177 char printbuf[MAX_READ*2 + 128];
178};
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000179
Denis Vlasenko4f93cde2007-03-20 20:03:03 +0000180static const struct init_globals init_data = {
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200181 .logFile = {
182 .path = "/var/log/messages",
183 .fd = -1,
184 },
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000185#ifdef SYSLOGD_MARK
186 .markInterval = 20 * 60,
187#endif
188 .logLevel = 8,
189#if ENABLE_FEATURE_ROTATE_LOGFILE
190 .logFileSize = 200 * 1024,
191 .logFileRotate = 1,
192#endif
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000193#if ENABLE_FEATURE_IPC_SYSLOG
194 .shmid = -1,
195 .s_semid = -1,
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200196 .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), /* default shm size */
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000197 .SMwup = { {1, -1, IPC_NOWAIT} },
198 .SMwdn = { {0, 0}, {1, 0}, {1, +1} },
199#endif
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000200};
201
202#define G (*ptr_to_globals)
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +0000203#define INIT_G() do { \
Denis Vlasenko574f2f42008-02-27 18:41:59 +0000204 SET_PTR_TO_GLOBALS(memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data))); \
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +0000205} while (0)
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000206
207
Denis Vlasenkoa0e2a0a2007-01-04 21:22:11 +0000208/* Options */
Denis Vlasenko14c19402006-09-30 19:20:00 +0000209enum {
210 OPTBIT_mark = 0, // -m
211 OPTBIT_nofork, // -n
212 OPTBIT_outfile, // -O
213 OPTBIT_loglevel, // -l
214 OPTBIT_small, // -S
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000215 IF_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s
216 IF_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b
217 IF_FEATURE_REMOTE_LOG( OPTBIT_remotelog ,) // -R
218 IF_FEATURE_REMOTE_LOG( OPTBIT_locallog ,) // -L
219 IF_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C
220 IF_FEATURE_SYSLOGD_DUP( OPTBIT_dup ,) // -D
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200221 IF_FEATURE_SYSLOGD_CFG( OPTBIT_cfg ,) // -f
Peter Korsgaardcd776cf2013-01-06 00:07:19 +0100222 IF_FEATURE_KMSG_SYSLOG( OPTBIT_kmsg ,) // -K
Denis Vlasenko14c19402006-09-30 19:20:00 +0000223
224 OPT_mark = 1 << OPTBIT_mark ,
225 OPT_nofork = 1 << OPTBIT_nofork ,
226 OPT_outfile = 1 << OPTBIT_outfile ,
227 OPT_loglevel = 1 << OPTBIT_loglevel,
228 OPT_small = 1 << OPTBIT_small ,
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000229 OPT_filesize = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0,
230 OPT_rotatecnt = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 0,
231 OPT_remotelog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_remotelog )) + 0,
232 OPT_locallog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_locallog )) + 0,
233 OPT_circularlog = IF_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0,
234 OPT_dup = IF_FEATURE_SYSLOGD_DUP( (1 << OPTBIT_dup )) + 0,
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200235 OPT_cfg = IF_FEATURE_SYSLOGD_CFG( (1 << OPTBIT_cfg )) + 0,
Peter Korsgaardcd776cf2013-01-06 00:07:19 +0100236 OPT_kmsg = IF_FEATURE_KMSG_SYSLOG( (1 << OPTBIT_kmsg )) + 0,
237
Denis Vlasenko14c19402006-09-30 19:20:00 +0000238};
239#define OPTION_STR "m:nO:l:S" \
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000240 IF_FEATURE_ROTATE_LOGFILE("s:" ) \
241 IF_FEATURE_ROTATE_LOGFILE("b:" ) \
242 IF_FEATURE_REMOTE_LOG( "R:" ) \
243 IF_FEATURE_REMOTE_LOG( "L" ) \
244 IF_FEATURE_IPC_SYSLOG( "C::") \
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200245 IF_FEATURE_SYSLOGD_DUP( "D" ) \
Peter Korsgaardcd776cf2013-01-06 00:07:19 +0100246 IF_FEATURE_SYSLOGD_CFG( "f:" ) \
247 IF_FEATURE_KMSG_SYSLOG( "K" )
Denis Vlasenko14c19402006-09-30 19:20:00 +0000248#define OPTION_DECL *opt_m, *opt_l \
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000249 IF_FEATURE_ROTATE_LOGFILE(,*opt_s) \
250 IF_FEATURE_ROTATE_LOGFILE(,*opt_b) \
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200251 IF_FEATURE_IPC_SYSLOG( ,*opt_C = NULL) \
252 IF_FEATURE_SYSLOGD_CFG( ,*opt_f = NULL)
253#define OPTION_PARAM &opt_m, &(G.logFile.path), &opt_l \
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000254 IF_FEATURE_ROTATE_LOGFILE(,&opt_s) \
255 IF_FEATURE_ROTATE_LOGFILE(,&opt_b) \
Denys Vlasenko69675782013-01-14 01:34:48 +0100256 IF_FEATURE_REMOTE_LOG( ,&remoteAddrList) \
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200257 IF_FEATURE_IPC_SYSLOG( ,&opt_C) \
258 IF_FEATURE_SYSLOGD_CFG( ,&opt_f)
Eric Andersen871d93c2002-09-17 20:06:29 +0000259
Eric Andersen871d93c2002-09-17 20:06:29 +0000260
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200261#if ENABLE_FEATURE_SYSLOGD_CFG
262static const CODE* find_by_name(char *name, const CODE* c_set)
263{
264 for (; c_set->c_name; c_set++) {
265 if (strcmp(name, c_set->c_name) == 0)
266 return c_set;
267 }
268 return NULL;
269}
270#endif
271static const CODE* find_by_val(int val, const CODE* c_set)
272{
273 for (; c_set->c_name; c_set++) {
274 if (c_set->c_val == val)
275 return c_set;
276 }
277 return NULL;
278}
279
280#if ENABLE_FEATURE_SYSLOGD_CFG
281static void parse_syslogdcfg(const char *file)
282{
283 char *t;
284 logRule_t **pp_rule;
285 /* tok[0] set of selectors */
286 /* tok[1] file name */
287 /* tok[2] has to be NULL */
288 char *tok[3];
289 parser_t *parser;
290
291 parser = config_open2(file ? file : "/etc/syslog.conf",
Denys Vlasenko514cbfc2011-09-16 13:28:52 +0200292 file ? xfopen_for_read : fopen_for_read);
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200293 if (!parser)
294 /* didn't find default /etc/syslog.conf */
295 /* proceed as if we built busybox without config support */
296 return;
297
298 /* use ptr to ptr to avoid checking whether head was initialized */
299 pp_rule = &G.log_rules;
300 /* iterate through lines of config, skipping comments */
301 while (config_read(parser, tok, 3, 2, "# \t", PARSE_NORMAL | PARSE_MIN_DIE)) {
302 char *cur_selector;
303 logRule_t *cur_rule;
304
305 /* unexpected trailing token? */
Denys Vlasenko0288b272011-04-16 20:15:14 +0200306 if (tok[2])
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200307 goto cfgerr;
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200308
309 cur_rule = *pp_rule = xzalloc(sizeof(*cur_rule));
310
311 cur_selector = tok[0];
312 /* iterate through selectors: "kern.info;kern.!err;..." */
313 do {
314 const CODE *code;
315 char *next_selector;
316 uint8_t negated_prio; /* "kern.!err" */
317 uint8_t single_prio; /* "kern.=err" */
318 uint32_t facmap; /* bitmap of enabled facilities */
319 uint8_t primap; /* bitmap of enabled priorities */
320 unsigned i;
321
322 next_selector = strchr(cur_selector, ';');
323 if (next_selector)
324 *next_selector++ = '\0';
325
326 t = strchr(cur_selector, '.');
Denys Vlasenko0288b272011-04-16 20:15:14 +0200327 if (!t)
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200328 goto cfgerr;
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200329 *t++ = '\0'; /* separate facility from priority */
330
331 negated_prio = 0;
332 single_prio = 0;
333 if (*t == '!') {
334 negated_prio = 1;
335 ++t;
336 }
337 if (*t == '=') {
338 single_prio = 1;
339 ++t;
340 }
341
342 /* parse priority */
343 if (*t == '*')
344 primap = 0xff; /* all 8 log levels enabled */
345 else {
346 uint8_t priority;
347 code = find_by_name(t, prioritynames);
348 if (!code)
349 goto cfgerr;
350 primap = 0;
351 priority = code->c_val;
352 if (priority == INTERNAL_NOPRI) {
353 /* ensure we take "enabled_facility_priomap[fac] &= 0" branch below */
354 negated_prio = 1;
355 } else {
356 priority = 1 << priority;
357 do {
358 primap |= priority;
359 if (single_prio)
360 break;
361 priority >>= 1;
362 } while (priority);
363 if (negated_prio)
364 primap = ~primap;
365 }
366 }
367
368 /* parse facility */
369 if (*cur_selector == '*')
370 facmap = (1<<LOG_NFACILITIES) - 1;
371 else {
372 char *next_facility;
373 facmap = 0;
374 t = cur_selector;
375 /* iterate through facilities: "kern,daemon.<priospec>" */
376 do {
377 next_facility = strchr(t, ',');
378 if (next_facility)
379 *next_facility++ = '\0';
380 code = find_by_name(t, facilitynames);
381 if (!code)
382 goto cfgerr;
383 /* "mark" is not a real facility, skip it */
384 if (code->c_val != INTERNAL_MARK)
385 facmap |= 1<<(LOG_FAC(code->c_val));
386 t = next_facility;
387 } while (t);
388 }
389
390 /* merge result with previous selectors */
391 for (i = 0; i < LOG_NFACILITIES; ++i) {
392 if (!(facmap & (1<<i)))
393 continue;
394 if (negated_prio)
395 cur_rule->enabled_facility_priomap[i] &= primap;
396 else
397 cur_rule->enabled_facility_priomap[i] |= primap;
398 }
399
400 cur_selector = next_selector;
401 } while (cur_selector);
402
Sergey Naumove9c8bed2011-04-16 19:36:15 +0200403 /* check whether current file name was mentioned in previous rules or
404 * as global logfile (G.logFile).
405 */
406 if (strcmp(G.logFile.path, tok[1]) == 0) {
407 cur_rule->file = &G.logFile;
408 goto found;
409 }
410 /* temporarily use cur_rule as iterator, but *pp_rule still points
411 * to currently processing rule entry.
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200412 * NOTE: *pp_rule points to the current (and last in the list) rule.
413 */
414 for (cur_rule = G.log_rules; cur_rule != *pp_rule; cur_rule = cur_rule->next) {
415 if (strcmp(cur_rule->file->path, tok[1]) == 0) {
416 /* found - reuse the same file structure */
417 (*pp_rule)->file = cur_rule->file;
418 cur_rule = *pp_rule;
419 goto found;
420 }
421 }
422 cur_rule->file = xzalloc(sizeof(*cur_rule->file));
423 cur_rule->file->fd = -1;
424 cur_rule->file->path = xstrdup(tok[1]);
425 found:
426 pp_rule = &cur_rule->next;
427 }
428 config_close(parser);
429 return;
430
431 cfgerr:
Denys Vlasenko81fa9992013-01-20 16:05:41 +0100432 bb_error_msg_and_die("error in '%s' at line %d",
433 file ? file : "/etc/syslog.conf",
434 parser->lineno);
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200435}
436#endif
437
Mark Whitley6317c4b2001-03-12 22:51:50 +0000438/* circular buffer variables/structures */
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000439#if ENABLE_FEATURE_IPC_SYSLOG
440
Eric Andersend4a5e252003-12-19 11:32:14 +0000441#if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
442#error Sorry, you must set the syslogd buffer size to at least 4KB.
443#error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
444#endif
445
Denis Vlasenkobd1aeeb2008-06-11 15:43:19 +0000446/* our shared key (syslogd.c and logread.c must be in sync) */
447enum { KEY_ID = 0x414e4547 }; /* "GENA" */
Mark Whitley6317c4b2001-03-12 22:51:50 +0000448
"Vladimir N. Oleynik"e4baaa22005-09-22 12:59:26 +0000449static void ipcsyslog_cleanup(void)
Glenn L McGrath912d8f42002-11-10 22:46:45 +0000450{
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000451 if (G.shmid != -1) {
452 shmdt(G.shbuf);
Glenn L McGrath912d8f42002-11-10 22:46:45 +0000453 }
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000454 if (G.shmid != -1) {
455 shmctl(G.shmid, IPC_RMID, NULL);
Glenn L McGrath912d8f42002-11-10 22:46:45 +0000456 }
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000457 if (G.s_semid != -1) {
458 semctl(G.s_semid, 0, IPC_RMID, 0);
Glenn L McGrath912d8f42002-11-10 22:46:45 +0000459 }
Mark Whitley6317c4b2001-03-12 22:51:50 +0000460}
461
"Vladimir N. Oleynik"e4baaa22005-09-22 12:59:26 +0000462static void ipcsyslog_init(void)
Glenn L McGrath912d8f42002-11-10 22:46:45 +0000463{
Denis Vlasenkoa9b60e92007-01-04 17:59:59 +0000464 if (DEBUG)
Denis Vlasenkobd1aeeb2008-06-11 15:43:19 +0000465 printf("shmget(%x, %d,...)\n", (int)KEY_ID, G.shm_size);
Denis Vlasenkoa9b60e92007-01-04 17:59:59 +0000466
Denis Vlasenkoa1120a82007-08-14 10:27:56 +0000467 G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644);
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000468 if (G.shmid == -1) {
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000469 bb_perror_msg_and_die("shmget");
470 }
Mark Whitley6317c4b2001-03-12 22:51:50 +0000471
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000472 G.shbuf = shmat(G.shmid, NULL, 0);
Denis Vlasenko4e9ca752008-01-07 15:58:02 +0000473 if (G.shbuf == (void*) -1L) { /* shmat has bizarre error return */
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000474 bb_perror_msg_and_die("shmat");
475 }
Mark Whitley6317c4b2001-03-12 22:51:50 +0000476
Denis Vlasenko5f1b1492007-08-12 21:33:06 +0000477 memset(G.shbuf, 0, G.shm_size);
478 G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data) - 1;
479 /*G.shbuf->tail = 0;*/
Mark Whitley6317c4b2001-03-12 22:51:50 +0000480
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200481 /* we'll trust the OS to set initial semval to 0 (let's hope) */
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000482 G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
483 if (G.s_semid == -1) {
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000484 if (errno == EEXIST) {
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000485 G.s_semid = semget(KEY_ID, 2, 0);
486 if (G.s_semid != -1)
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000487 return;
Glenn L McGrath912d8f42002-11-10 22:46:45 +0000488 }
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000489 bb_perror_msg_and_die("semget");
Mark Whitley6317c4b2001-03-12 22:51:50 +0000490 }
491}
492
Denis Vlasenkoa0e2a0a2007-01-04 21:22:11 +0000493/* Write message to shared mem buffer */
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200494static void log_to_shmem(const char *msg)
Glenn L McGrath912d8f42002-11-10 22:46:45 +0000495{
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000496 int old_tail, new_tail;
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200497 int len;
Mark Whitley6317c4b2001-03-12 22:51:50 +0000498
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000499 if (semop(G.s_semid, G.SMwdn, 3) == -1) {
Bernhard Reutner-Fischerd591a362006-08-20 17:35:13 +0000500 bb_perror_msg_and_die("SMwdn");
501 }
Mark Whitley6317c4b2001-03-12 22:51:50 +0000502
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000503 /* Circular Buffer Algorithm:
Mark Whitley6317c4b2001-03-12 22:51:50 +0000504 * --------------------------
Denis Vlasenko150f4022007-01-13 21:06:21 +0000505 * tail == position where to store next syslog message.
Denis Vlasenko5f1b1492007-08-12 21:33:06 +0000506 * tail's max value is (shbuf->size - 1)
507 * Last byte of buffer is never used and remains NUL.
Mark Whitley6317c4b2001-03-12 22:51:50 +0000508 */
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200509 len = strlen(msg) + 1; /* length with NUL included */
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000510 again:
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000511 old_tail = G.shbuf->tail;
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000512 new_tail = old_tail + len;
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000513 if (new_tail < G.shbuf->size) {
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000514 /* store message, set new tail */
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000515 memcpy(G.shbuf->data + old_tail, msg, len);
516 G.shbuf->tail = new_tail;
Glenn L McGrath912d8f42002-11-10 22:46:45 +0000517 } else {
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000518 /* k == available buffer space ahead of old tail */
Denis Vlasenko5f1b1492007-08-12 21:33:06 +0000519 int k = G.shbuf->size - old_tail;
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000520 /* copy what fits to the end of buffer, and repeat */
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000521 memcpy(G.shbuf->data + old_tail, msg, k);
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000522 msg += k;
523 len -= k;
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000524 G.shbuf->tail = 0;
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000525 goto again;
Mark Whitley6317c4b2001-03-12 22:51:50 +0000526 }
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000527 if (semop(G.s_semid, G.SMwup, 1) == -1) {
Bernhard Reutner-Fischerd591a362006-08-20 17:35:13 +0000528 bb_perror_msg_and_die("SMwup");
529 }
Denis Vlasenkoa9b60e92007-01-04 17:59:59 +0000530 if (DEBUG)
Denis Vlasenko5f1b1492007-08-12 21:33:06 +0000531 printf("tail:%d\n", G.shbuf->tail);
Mark Whitley6317c4b2001-03-12 22:51:50 +0000532}
Rob Landley028ba282006-08-28 20:16:42 +0000533#else
Peter Korsgaard99807072013-01-06 13:11:04 +0100534static void ipcsyslog_cleanup(void) {}
535static void ipcsyslog_init(void) {}
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000536void log_to_shmem(const char *msg);
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000537#endif /* FEATURE_IPC_SYSLOG */
538
Peter Korsgaardcd776cf2013-01-06 00:07:19 +0100539#if ENABLE_FEATURE_KMSG_SYSLOG
540static void kmsg_init(void)
541{
542 G.kmsgfd = xopen("/dev/kmsg", O_WRONLY);
543
544 /*
545 * kernel < 3.5 expects single char printk KERN_* priority prefix,
546 * from 3.5 onwards the full syslog facility/priority format is supported
547 */
548 if (get_linux_version_code() < KERNEL_VERSION(3,5,0))
549 G.primask = LOG_PRIMASK;
550 else
551 G.primask = -1;
552}
553
554static void kmsg_cleanup(void)
555{
556 if (ENABLE_FEATURE_CLEAN_UP)
557 close(G.kmsgfd);
558}
559
560/* Write message to /dev/kmsg */
561static void log_to_kmsg(int pri, const char *msg)
562{
563 /*
564 * kernel < 3.5 expects single char printk KERN_* priority prefix,
565 * from 3.5 onwards the full syslog facility/priority format is supported
566 */
567 pri &= G.primask;
568
569 write(G.kmsgfd, G.printbuf, sprintf(G.printbuf, "<%d>%s\n", pri, msg));
570}
571#else
Peter Korsgaard99807072013-01-06 13:11:04 +0100572static void kmsg_init(void) {}
573static void kmsg_cleanup(void) {}
574static void log_to_kmsg(int pri UNUSED_PARAM, const char *msg UNUSED_PARAM) {}
Peter Korsgaardcd776cf2013-01-06 00:07:19 +0100575#endif /* FEATURE_KMSG_SYSLOG */
576
Erik Andersen983b51b2000-04-04 18:14:25 +0000577/* Print a message to the log file. */
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200578static void log_locally(time_t now, char *msg, logFile_t *log_file)
Eric Andersen3843e961999-11-25 07:30:46 +0000579{
Denis Vlasenko0d948202008-12-09 22:53:31 +0000580#ifdef SYSLOGD_WRLOCK
Denis Vlasenkob8934972007-01-04 18:02:32 +0000581 struct flock fl;
Denis Vlasenko0d948202008-12-09 22:53:31 +0000582#endif
Denis Vlasenkob8934972007-01-04 18:02:32 +0000583 int len = strlen(msg);
Eric Andersen3843e961999-11-25 07:30:46 +0000584
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200585 if (log_file->fd >= 0) {
Denis Vlasenkod9415d62009-03-02 14:26:28 +0000586 /* Reopen log file every second. This allows admin
587 * to delete the file and not worry about restarting us.
588 * This costs almost nothing since it happens
589 * _at most_ once a second.
590 */
Denis Vlasenko4dada742008-01-03 12:13:42 +0000591 if (!now)
592 now = time(NULL);
593 if (G.last_log_time != now) {
Denis Vlasenkod9415d62009-03-02 14:26:28 +0000594 G.last_log_time = now;
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200595 close(log_file->fd);
Denis Vlasenkob8934972007-01-04 18:02:32 +0000596 goto reopen;
597 }
598 } else {
Denis Vlasenkob8934972007-01-04 18:02:32 +0000599 reopen:
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200600 log_file->fd = open(log_file->path, O_WRONLY | O_CREAT
Denis Vlasenkod9415d62009-03-02 14:26:28 +0000601 | O_NOCTTY | O_APPEND | O_NONBLOCK,
602 0666);
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200603 if (log_file->fd < 0) {
Denis Vlasenkob8934972007-01-04 18:02:32 +0000604 /* cannot open logfile? - print to /dev/console then */
Denis Vlasenko70ab28f2007-11-18 05:43:05 +0000605 int fd = device_open(DEV_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
Denis Vlasenkob8934972007-01-04 18:02:32 +0000606 if (fd < 0)
607 fd = 2; /* then stderr, dammit */
608 full_write(fd, msg, len);
609 if (fd != 2)
610 close(fd);
611 return;
612 }
613#if ENABLE_FEATURE_ROTATE_LOGFILE
Denis Vlasenkobae79482007-01-09 23:42:43 +0000614 {
Denis Vlasenko5f1b1492007-08-12 21:33:06 +0000615 struct stat statf;
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200616 log_file->isRegular = (fstat(log_file->fd, &statf) == 0 && S_ISREG(statf.st_mode));
Denis Vlasenko5f1b1492007-08-12 21:33:06 +0000617 /* bug (mostly harmless): can wrap around if file > 4gb */
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200618 log_file->size = statf.st_size;
Denis Vlasenkobae79482007-01-09 23:42:43 +0000619 }
Denis Vlasenkob8934972007-01-04 18:02:32 +0000620#endif
621 }
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000622
Denis Vlasenko0d948202008-12-09 22:53:31 +0000623#ifdef SYSLOGD_WRLOCK
Denis Vlasenkob8934972007-01-04 18:02:32 +0000624 fl.l_whence = SEEK_SET;
625 fl.l_start = 0;
626 fl.l_len = 1;
627 fl.l_type = F_WRLCK;
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200628 fcntl(log_file->fd, F_SETLKW, &fl);
Denis Vlasenko0d948202008-12-09 22:53:31 +0000629#endif
Bernhard Reutner-Fischerd591a362006-08-20 17:35:13 +0000630
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000631#if ENABLE_FEATURE_ROTATE_LOGFILE
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200632 if (G.logFileSize && log_file->isRegular && log_file->size > G.logFileSize) {
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000633 if (G.logFileRotate) { /* always 0..99 */
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200634 int i = strlen(log_file->path) + 3 + 1;
Denis Vlasenkob8934972007-01-04 18:02:32 +0000635 char oldFile[i];
636 char newFile[i];
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000637 i = G.logFileRotate - 1;
Denis Vlasenkob8934972007-01-04 18:02:32 +0000638 /* rename: f.8 -> f.9; f.7 -> f.8; ... */
639 while (1) {
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200640 sprintf(newFile, "%s.%d", log_file->path, i);
Denis Vlasenkob8934972007-01-04 18:02:32 +0000641 if (i == 0) break;
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200642 sprintf(oldFile, "%s.%d", log_file->path, --i);
Denis Vlasenko69dc3252008-05-24 21:03:53 +0000643 /* ignore errors - file might be missing */
644 rename(oldFile, newFile);
Eric Andersen29c77f72003-10-09 09:43:18 +0000645 }
Denis Vlasenkob8934972007-01-04 18:02:32 +0000646 /* newFile == "f.0" now */
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200647 rename(log_file->path, newFile);
Christian Engelmayer8de2e422011-10-28 18:12:42 +0200648 /* Incredibly, if F and F.0 are hardlinks, POSIX
649 * _demands_ that rename returns 0 but does not
650 * remove F!!!
651 * (hardlinked F/F.0 pair was observed after
652 * power failure during rename()).
653 * Ensure old file is gone:
654 */
655 unlink(log_file->path);
Denis Vlasenko0d948202008-12-09 22:53:31 +0000656#ifdef SYSLOGD_WRLOCK
Denis Vlasenkob8934972007-01-04 18:02:32 +0000657 fl.l_type = F_UNLCK;
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200658 fcntl(log_file->fd, F_SETLKW, &fl);
Denis Vlasenko0d948202008-12-09 22:53:31 +0000659#endif
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200660 close(log_file->fd);
Denis Vlasenkob8934972007-01-04 18:02:32 +0000661 goto reopen;
Eric Andersen29c77f72003-10-09 09:43:18 +0000662 }
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200663 ftruncate(log_file->fd, 0);
Eric Andersen3843e961999-11-25 07:30:46 +0000664 }
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200665 log_file->size +=
Denis Vlasenkob8934972007-01-04 18:02:32 +0000666#endif
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200667 full_write(log_file->fd, msg, len);
Denis Vlasenko0d948202008-12-09 22:53:31 +0000668#ifdef SYSLOGD_WRLOCK
Denis Vlasenkob8934972007-01-04 18:02:32 +0000669 fl.l_type = F_UNLCK;
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200670 fcntl(log_file->fd, F_SETLKW, &fl);
Denis Vlasenko0d948202008-12-09 22:53:31 +0000671#endif
Eric Andersenb99df0f1999-11-24 09:04:33 +0000672}
673
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000674static void parse_fac_prio_20(int pri, char *res20)
Eric Andersen3843e961999-11-25 07:30:46 +0000675{
Denis Vlasenko3c8b5ba2007-06-04 18:23:59 +0000676 const CODE *c_pri, *c_fac;
Eric Andersenb99df0f1999-11-24 09:04:33 +0000677
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200678 c_fac = find_by_val(LOG_FAC(pri) << 3, facilitynames);
679 if (c_fac) {
680 c_pri = find_by_val(LOG_PRI(pri), prioritynames);
681 if (c_pri) {
682 snprintf(res20, 20, "%s.%s", c_fac->c_name, c_pri->c_name);
683 return;
Glenn L McGrath912d8f42002-11-10 22:46:45 +0000684 }
Erik Andersen9ffdaa62000-02-11 21:55:04 +0000685 }
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200686 snprintf(res20, 20, "<%d>", pri);
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000687}
Eric Andersen3843e961999-11-25 07:30:46 +0000688
Denis Vlasenkoa0e2a0a2007-01-04 21:22:11 +0000689/* len parameter is used only for "is there a timestamp?" check.
Denis Vlasenko018b1552007-11-06 01:38:46 +0000690 * NB: some callers cheat and supply len==0 when they know
691 * that there is no timestamp, short-circuiting the test. */
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000692static void timestamp_and_log(int pri, char *msg, int len)
693{
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000694 char *timestamp;
Denis Vlasenko4dada742008-01-03 12:13:42 +0000695 time_t now;
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +0000696
Denis Vlasenko574c3162009-04-22 02:53:02 +0000697 /* Jan 18 00:11:22 msg... */
698 /* 01234567890123456 */
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000699 if (len < 16 || msg[3] != ' ' || msg[6] != ' '
700 || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
701 ) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000702 time(&now);
Denis Vlasenko4dada742008-01-03 12:13:42 +0000703 timestamp = ctime(&now) + 4; /* skip day of week */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000704 } else {
Denis Vlasenko4dada742008-01-03 12:13:42 +0000705 now = 0;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000706 timestamp = msg;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000707 msg += 16;
708 }
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000709 timestamp[15] = '\0';
Eric Andersen3843e961999-11-25 07:30:46 +0000710
Peter Korsgaard99807072013-01-06 13:11:04 +0100711 if (option_mask32 & OPT_kmsg) {
Peter Korsgaardcd776cf2013-01-06 00:07:19 +0100712 log_to_kmsg(pri, msg);
713 return;
714 }
715
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +0000716 if (option_mask32 & OPT_small)
717 sprintf(G.printbuf, "%s %s\n", timestamp, msg);
718 else {
719 char res[20];
720 parse_fac_prio_20(pri, res);
Denis Vlasenko6f1713f2008-02-25 23:23:58 +0000721 sprintf(G.printbuf, "%s %.64s %s %s\n", timestamp, G.hostname, res, msg);
Eric Andersenbf2b8ae2000-12-08 19:52:01 +0000722 }
Denis Vlasenko4dada742008-01-03 12:13:42 +0000723
724 /* Log message locally (to file or shared mem) */
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200725#if ENABLE_FEATURE_SYSLOGD_CFG
726 {
727 bool match = 0;
728 logRule_t *rule;
729 uint8_t facility = LOG_FAC(pri);
730 uint8_t prio_bit = 1 << LOG_PRI(pri);
731
732 for (rule = G.log_rules; rule; rule = rule->next) {
733 if (rule->enabled_facility_priomap[facility] & prio_bit) {
734 log_locally(now, G.printbuf, rule->file);
735 match = 1;
736 }
737 }
738 if (match)
739 return;
740 }
741#endif
742 if (LOG_PRI(pri) < G.logLevel) {
743#if ENABLE_FEATURE_IPC_SYSLOG
744 if ((option_mask32 & OPT_circularlog) && G.shbuf) {
Denys Vlasenko514cbfc2011-09-16 13:28:52 +0200745 log_to_shmem(G.printbuf);
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200746 return;
747 }
748#endif
749 log_locally(now, G.printbuf, &G.logFile);
750 }
Denis Vlasenko4dada742008-01-03 12:13:42 +0000751}
752
753static void timestamp_and_log_internal(const char *msg)
754{
Denis Vlasenko0d948202008-12-09 22:53:31 +0000755 /* -L, or no -R */
Denis Vlasenko4dada742008-01-03 12:13:42 +0000756 if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog))
757 return;
758 timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)msg, 0);
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000759}
Glenn L McGrath73ebb882004-09-14 18:12:13 +0000760
Denis Vlasenko75cddd82008-02-13 09:19:14 +0000761/* tmpbuf[len] is a NUL byte (set by caller), but there can be other,
762 * embedded NULs. Split messages on each of these NULs, parse prio,
763 * escape control chars and log each locally. */
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000764static void split_escape_and_log(char *tmpbuf, int len)
765{
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000766 char *p = tmpbuf;
767
768 tmpbuf += len;
769 while (p < tmpbuf) {
770 char c;
Denis Vlasenko4f93cde2007-03-20 20:03:03 +0000771 char *q = G.parsebuf;
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000772 int pri = (LOG_USER | LOG_NOTICE);
773
774 if (*p == '<') {
Denis Vlasenkoa0e2a0a2007-01-04 21:22:11 +0000775 /* Parse the magic priority number */
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000776 pri = bb_strtou(p + 1, &p, 10);
Denis Vlasenko018b1552007-11-06 01:38:46 +0000777 if (*p == '>')
778 p++;
779 if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000780 pri = (LOG_USER | LOG_NOTICE);
Denis Vlasenko1decd0e2006-09-30 19:17:40 +0000781 }
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000782
783 while ((c = *p++)) {
784 if (c == '\n')
785 c = ' ';
Denis Vlasenko2ee028d2007-06-21 13:44:53 +0000786 if (!(c & ~0x1f) && c != '\t') {
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000787 *q++ = '^';
788 c += '@'; /* ^@, ^A, ^B... */
789 }
790 *q++ = c;
791 }
792 *q = '\0';
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +0000793
Denis Vlasenkoa0e2a0a2007-01-04 21:22:11 +0000794 /* Now log it */
Sergey Naumov73ef15c2011-04-10 07:34:27 +0200795 timestamp_and_log(pri, G.parsebuf, q - G.parsebuf);
Eric Andersen7f94a5c2004-06-22 10:12:59 +0000796 }
Eric Andersen3843e961999-11-25 07:30:46 +0000797}
798
Denis Vlasenko4998c812007-02-14 20:51:46 +0000799#ifdef SYSLOGD_MARK
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000800static void do_mark(int sig)
Eric Andersen3843e961999-11-25 07:30:46 +0000801{
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000802 if (G.markInterval) {
Denis Vlasenko4dada742008-01-03 12:13:42 +0000803 timestamp_and_log_internal("-- MARK --");
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000804 alarm(G.markInterval);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000805 }
Eric Andersen3843e961999-11-25 07:30:46 +0000806}
Denis Vlasenko4998c812007-02-14 20:51:46 +0000807#endif
Eric Andersen3843e961999-11-25 07:30:46 +0000808
Denis Vlasenkod031b202007-11-10 01:28:19 +0000809/* Don't inline: prevent struct sockaddr_un to take up space on stack
810 * permanently */
811static NOINLINE int create_socket(void)
Eric Andersen3843e961999-11-25 07:30:46 +0000812{
Erik Andersene49d5ec2000-02-08 19:58:47 +0000813 struct sockaddr_un sunx;
Denis Vlasenkod7ecd862007-09-07 13:53:32 +0000814 int sock_fd;
Denis Vlasenko6ca04442007-02-11 16:19:28 +0000815 char *dev_log_name;
Erik Andersenf13df372000-04-18 23:51:51 +0000816
Davide Cavalca9b3b9792011-01-25 02:26:03 +0100817#if ENABLE_FEATURE_SYSTEMD
818 if (sd_listen_fds() == 1)
819 return SD_LISTEN_FDS_START;
820#endif
821
Denis Vlasenkod031b202007-11-10 01:28:19 +0000822 memset(&sunx, 0, sizeof(sunx));
823 sunx.sun_family = AF_UNIX;
824
825 /* Unlink old /dev/log or object it points to. */
826 /* (if it exists, bind will fail) */
827 strcpy(sunx.sun_path, "/dev/log");
828 dev_log_name = xmalloc_follow_symlinks("/dev/log");
829 if (dev_log_name) {
830 safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
831 free(dev_log_name);
832 }
833 unlink(sunx.sun_path);
834
835 sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
836 xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
837 chmod("/dev/log", 0666);
838
839 return sock_fd;
840}
841
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +0000842#if ENABLE_FEATURE_REMOTE_LOG
Thomas Geuligd2f77792010-02-28 13:01:59 +0100843static int try_to_resolve_remote(remoteHost_t *rh)
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +0000844{
Thomas Geuligd2f77792010-02-28 13:01:59 +0100845 if (!rh->remoteAddr) {
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +0000846 unsigned now = monotonic_sec();
847
848 /* Don't resolve name too often - DNS timeouts can be big */
Thomas Geuligd2f77792010-02-28 13:01:59 +0100849 if ((now - rh->last_dns_resolve) < DNS_WAIT_SEC)
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +0000850 return -1;
Thomas Geuligd2f77792010-02-28 13:01:59 +0100851 rh->last_dns_resolve = now;
852 rh->remoteAddr = host2sockaddr(rh->remoteHostname, 514);
853 if (!rh->remoteAddr)
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +0000854 return -1;
855 }
Daniel Dickinsone74d7982010-08-03 04:26:20 +0200856 return xsocket(rh->remoteAddr->u.sa.sa_family, SOCK_DGRAM, 0);
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +0000857}
858#endif
859
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +0000860static void do_syslogd(void) NORETURN;
Denis Vlasenkod031b202007-11-10 01:28:19 +0000861static void do_syslogd(void)
862{
863 int sock_fd;
Thomas Geuligd2f77792010-02-28 13:01:59 +0100864#if ENABLE_FEATURE_REMOTE_LOG
865 llist_t *item;
866#endif
Denis Vlasenkobe048f22008-02-26 20:13:52 +0000867#if ENABLE_FEATURE_SYSLOGD_DUP
868 int last_sz = -1;
869 char *last_buf;
870 char *recvbuf = G.recvbuf;
871#else
872#define recvbuf (G.recvbuf)
873#endif
Denis Vlasenkod031b202007-11-10 01:28:19 +0000874
Denis Vlasenko0d948202008-12-09 22:53:31 +0000875 /* Set up signal handlers (so that they interrupt read()) */
876 signal_no_SA_RESTART_empty_mask(SIGTERM, record_signo);
877 signal_no_SA_RESTART_empty_mask(SIGINT, record_signo);
878 //signal_no_SA_RESTART_empty_mask(SIGQUIT, record_signo);
Glenn L McGrath912d8f42002-11-10 22:46:45 +0000879 signal(SIGHUP, SIG_IGN);
Denis Vlasenko4998c812007-02-14 20:51:46 +0000880#ifdef SYSLOGD_MARK
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000881 signal(SIGALRM, do_mark);
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000882 alarm(G.markInterval);
Denis Vlasenko4998c812007-02-14 20:51:46 +0000883#endif
Denis Vlasenkod031b202007-11-10 01:28:19 +0000884 sock_fd = create_socket();
Eric Andersenb99df0f1999-11-24 09:04:33 +0000885
Peter Korsgaard99807072013-01-06 13:11:04 +0100886 if (option_mask32 & OPT_circularlog)
Glenn L McGrath912d8f42002-11-10 22:46:45 +0000887 ipcsyslog_init();
Eric Andersenea906502001-04-05 20:55:17 +0000888
Peter Korsgaard99807072013-01-06 13:11:04 +0100889 if (option_mask32 & OPT_kmsg)
Peter Korsgaardcd776cf2013-01-06 00:07:19 +0100890 kmsg_init();
891
Denis Vlasenko4dada742008-01-03 12:13:42 +0000892 timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000893
Denis Vlasenko0d948202008-12-09 22:53:31 +0000894 while (!bb_got_signal) {
Denis Vlasenko6b06cb82008-05-15 21:30:45 +0000895 ssize_t sz;
Denis Vlasenkobe048f22008-02-26 20:13:52 +0000896
897#if ENABLE_FEATURE_SYSLOGD_DUP
898 last_buf = recvbuf;
899 if (recvbuf == G.recvbuf)
900 recvbuf = G.recvbuf + MAX_READ;
901 else
902 recvbuf = G.recvbuf;
903#endif
Denis Vlasenko018b1552007-11-06 01:38:46 +0000904 read_again:
Denis Vlasenko0d948202008-12-09 22:53:31 +0000905 sz = read(sock_fd, recvbuf, MAX_READ - 1);
906 if (sz < 0) {
907 if (!bb_got_signal)
908 bb_perror_msg("read from /dev/log");
909 break;
910 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000911
Denis Vlasenko75cddd82008-02-13 09:19:14 +0000912 /* Drop trailing '\n' and NULs (typically there is one NUL) */
Denis Vlasenko018b1552007-11-06 01:38:46 +0000913 while (1) {
914 if (sz == 0)
915 goto read_again;
Denis Vlasenkocb12cb22007-11-06 11:34:03 +0000916 /* man 3 syslog says: "A trailing newline is added when needed".
917 * However, neither glibc nor uclibc do this:
918 * syslog(prio, "test") sends "test\0" to /dev/log,
Denis Vlasenko75cddd82008-02-13 09:19:14 +0000919 * syslog(prio, "test\n") sends "test\n\0".
Denis Vlasenkocb12cb22007-11-06 11:34:03 +0000920 * IOW: newline is passed verbatim!
921 * I take it to mean that it's syslogd's job
Denis Vlasenko75cddd82008-02-13 09:19:14 +0000922 * to make those look identical in the log files. */
Denis Vlasenkobe048f22008-02-26 20:13:52 +0000923 if (recvbuf[sz-1] != '\0' && recvbuf[sz-1] != '\n')
Denis Vlasenko018b1552007-11-06 01:38:46 +0000924 break;
925 sz--;
926 }
Denis Vlasenkobe048f22008-02-26 20:13:52 +0000927#if ENABLE_FEATURE_SYSLOGD_DUP
928 if ((option_mask32 & OPT_dup) && (sz == last_sz))
929 if (memcmp(last_buf, recvbuf, sz) == 0)
930 continue;
931 last_sz = sz;
932#endif
Denis Vlasenkoceab8702007-01-04 17:57:54 +0000933#if ENABLE_FEATURE_REMOTE_LOG
Thomas Geuligd2f77792010-02-28 13:01:59 +0100934 /* Stock syslogd sends it '\n'-terminated
935 * over network, mimic that */
936 recvbuf[sz] = '\n';
937
Denis Vlasenkod7ecd862007-09-07 13:53:32 +0000938 /* We are not modifying log messages in any way before send */
939 /* Remote site cannot trust _us_ anyway and need to do validation again */
Thomas Geuligd2f77792010-02-28 13:01:59 +0100940 for (item = G.remoteHosts; item != NULL; item = item->link) {
941 remoteHost_t *rh = (remoteHost_t *)item->data;
942
943 if (rh->remoteFD == -1) {
944 rh->remoteFD = try_to_resolve_remote(rh);
945 if (rh->remoteFD == -1)
946 continue;
Glenn L McGrath912d8f42002-11-10 22:46:45 +0000947 }
Daniel Dickinsone74d7982010-08-03 04:26:20 +0200948
949 /* Send message to remote logger.
950 * On some errors, close and set remoteFD to -1
951 * so that DNS resolution is retried.
952 */
953 if (sendto(rh->remoteFD, recvbuf, sz+1,
954 MSG_DONTWAIT | MSG_NOSIGNAL,
955 &(rh->remoteAddr->u.sa), rh->remoteAddr->len) == -1
956 ) {
957 switch (errno) {
958 case ECONNRESET:
959 case ENOTCONN: /* paranoia */
960 case EPIPE:
961 close(rh->remoteFD);
962 rh->remoteFD = -1;
963 free(rh->remoteAddr);
964 rh->remoteAddr = NULL;
965 }
966 }
Denis Vlasenko87f3b262007-09-07 13:43:28 +0000967 }
Denis Vlasenkod7ecd862007-09-07 13:53:32 +0000968#endif
Denis Vlasenko75cddd82008-02-13 09:19:14 +0000969 if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
Denis Vlasenkobe048f22008-02-26 20:13:52 +0000970 recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */
971 split_escape_and_log(recvbuf, sz);
Denis Vlasenko75cddd82008-02-13 09:19:14 +0000972 }
Denis Vlasenko0d948202008-12-09 22:53:31 +0000973 } /* while (!bb_got_signal) */
974
975 timestamp_and_log_internal("syslogd exiting");
976 puts("syslogd exiting");
Anthony G. Basile12677ac2012-12-10 14:49:39 -0500977 remove_pidfile(CONFIG_PID_FILE_PATH "/syslogd.pid");
Peter Korsgaard99807072013-01-06 13:11:04 +0100978 ipcsyslog_cleanup();
979 if (option_mask32 & OPT_kmsg)
Peter Korsgaardcd776cf2013-01-06 00:07:19 +0100980 kmsg_cleanup();
Denis Vlasenko0d948202008-12-09 22:53:31 +0000981 kill_myself_with_sig(bb_got_signal);
Denis Vlasenkobd1aeeb2008-06-11 15:43:19 +0000982#undef recvbuf
Eric Andersenb99df0f1999-11-24 09:04:33 +0000983}
984
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +0000985int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +0000986int syslogd_main(int argc UNUSED_PARAM, char **argv)
Eric Andersen3843e961999-11-25 07:30:46 +0000987{
Denis Vlasenko0d948202008-12-09 22:53:31 +0000988 int opts;
Thomas Geuligd2f77792010-02-28 13:01:59 +0100989 char OPTION_DECL;
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +0000990#if ENABLE_FEATURE_REMOTE_LOG
Thomas Geuligd2f77792010-02-28 13:01:59 +0100991 llist_t *remoteAddrList = NULL;
Denis Vlasenko4f2e8bc2008-01-03 12:12:27 +0000992#endif
Denis Vlasenko5e892ba2007-03-15 19:50:46 +0000993
Thomas Geuligd2f77792010-02-28 13:01:59 +0100994 INIT_G();
995
996 /* No non-option params, -R can occur multiple times */
997 opt_complementary = "=0" IF_FEATURE_REMOTE_LOG(":R::");
Denis Vlasenko0d948202008-12-09 22:53:31 +0000998 opts = getopt32(argv, OPTION_STR, OPTION_PARAM);
Thomas Geuligd2f77792010-02-28 13:01:59 +0100999#if ENABLE_FEATURE_REMOTE_LOG
1000 while (remoteAddrList) {
1001 remoteHost_t *rh = xzalloc(sizeof(*rh));
1002 rh->remoteHostname = llist_pop(&remoteAddrList);
1003 rh->remoteFD = -1;
1004 rh->last_dns_resolve = monotonic_sec() - DNS_WAIT_SEC - 1;
1005 llist_add_to(&G.remoteHosts, rh);
1006 }
1007#endif
1008
Denis Vlasenko4998c812007-02-14 20:51:46 +00001009#ifdef SYSLOGD_MARK
Denis Vlasenko0d948202008-12-09 22:53:31 +00001010 if (opts & OPT_mark) // -m
Denis Vlasenko5e892ba2007-03-15 19:50:46 +00001011 G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
Denis Vlasenko4998c812007-02-14 20:51:46 +00001012#endif
Denis Vlasenko0d948202008-12-09 22:53:31 +00001013 //if (opts & OPT_nofork) // -n
1014 //if (opts & OPT_outfile) // -O
1015 if (opts & OPT_loglevel) // -l
Denis Vlasenko5e892ba2007-03-15 19:50:46 +00001016 G.logLevel = xatou_range(opt_l, 1, 8);
Denis Vlasenko0d948202008-12-09 22:53:31 +00001017 //if (opts & OPT_small) // -S
Denis Vlasenko14c19402006-09-30 19:20:00 +00001018#if ENABLE_FEATURE_ROTATE_LOGFILE
Denis Vlasenko0d948202008-12-09 22:53:31 +00001019 if (opts & OPT_filesize) // -s
Denis Vlasenko5e892ba2007-03-15 19:50:46 +00001020 G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
Denis Vlasenko0d948202008-12-09 22:53:31 +00001021 if (opts & OPT_rotatecnt) // -b
Denis Vlasenko5e892ba2007-03-15 19:50:46 +00001022 G.logFileRotate = xatou_range(opt_b, 0, 99);
Denis Vlasenko14c19402006-09-30 19:20:00 +00001023#endif
Denis Vlasenko14c19402006-09-30 19:20:00 +00001024#if ENABLE_FEATURE_IPC_SYSLOG
Denis Vlasenko218f2f42007-01-24 22:02:01 +00001025 if (opt_C) // -Cn
Denis Vlasenko5e892ba2007-03-15 19:50:46 +00001026 G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
Denis Vlasenko14c19402006-09-30 19:20:00 +00001027#endif
Eric Andersen4ed17822000-12-11 19:28:29 +00001028 /* If they have not specified remote logging, then log locally */
Denis Vlasenko0d948202008-12-09 22:53:31 +00001029 if (ENABLE_FEATURE_REMOTE_LOG && !(opts & OPT_remotelog)) // -R
Denis Vlasenkoc12f5302006-10-06 09:49:47 +00001030 option_mask32 |= OPT_locallog;
Sergey Naumov73ef15c2011-04-10 07:34:27 +02001031#if ENABLE_FEATURE_SYSLOGD_CFG
1032 parse_syslogdcfg(opt_f);
1033#endif
Mark Whitley6317c4b2001-03-12 22:51:50 +00001034
Erik Andersene49d5ec2000-02-08 19:58:47 +00001035 /* Store away localhost's name before the fork */
Denis Vlasenko6f1713f2008-02-25 23:23:58 +00001036 G.hostname = safe_gethostname();
1037 *strchrnul(G.hostname, '.') = '\0';
Erik Andersene49d5ec2000-02-08 19:58:47 +00001038
Denis Vlasenko0d948202008-12-09 22:53:31 +00001039 if (!(opts & OPT_nofork)) {
Denis Vlasenko5a142022007-03-26 13:20:54 +00001040 bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
Eric Andersen35e643b2003-07-28 07:40:39 +00001041 }
Anthony G. Basile12677ac2012-12-10 14:49:39 -05001042
Denys Vlasenkoa4252422010-01-29 16:44:48 +01001043 //umask(0); - why??
Anthony G. Basile12677ac2012-12-10 14:49:39 -05001044 write_pidfile(CONFIG_PID_FILE_PATH "/syslogd.pid");
1045
Denis Vlasenkoceab8702007-01-04 17:57:54 +00001046 do_syslogd();
Denis Vlasenko8a820b22007-01-06 22:08:53 +00001047 /* return EXIT_SUCCESS; */
Eric Andersen3843e961999-11-25 07:30:46 +00001048}
Denis Vlasenkobd1aeeb2008-06-11 15:43:19 +00001049
1050/* Clean up. Needed because we are included from syslogd_and_logger.c */
Denis Vlasenko0d948202008-12-09 22:53:31 +00001051#undef DEBUG
1052#undef SYSLOGD_MARK
1053#undef SYSLOGD_WRLOCK
Denis Vlasenkobd1aeeb2008-06-11 15:43:19 +00001054#undef G
1055#undef GLOBALS
1056#undef INIT_G
1057#undef OPTION_STR
1058#undef OPTION_DECL
1059#undef OPTION_PARAM