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 |
|
---|
16 | //usage:#define syslogd_trivial_usage
|
---|
17 | //usage: "[OPTIONS]"
|
---|
18 | //usage:#define syslogd_full_usage "\n\n"
|
---|
19 | //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: )
|
---|
23 | //usage: "\n -n Run in foreground"
|
---|
24 | //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"
|
---|
27 | //usage: IF_FEATURE_ROTATE_LOGFILE(
|
---|
28 | //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: )
|
---|
31 | //usage: IF_FEATURE_REMOTE_LOG(
|
---|
32 | //usage: "\n -R HOST[:PORT] Log to IP or hostname on PORT (default PORT=514/UDP)"
|
---|
33 | //usage: "\n -L Log locally and via network (default is network only if -R)"
|
---|
34 | //usage: )
|
---|
35 | //usage: IF_FEATURE_SYSLOGD_DUP(
|
---|
36 | //usage: "\n -D Drop duplicates"
|
---|
37 | //usage: )
|
---|
38 | //usage: IF_FEATURE_IPC_SYSLOG(
|
---|
39 | /* NB: -Csize shouldn't have space (because size is optional) */
|
---|
40 | //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: )
|
---|
45 | /* //usage: "\n -m MIN Minutes between MARK lines (default:20, 0=off)" */
|
---|
46 | //usage: IF_FEATURE_KMSG_SYSLOG(
|
---|
47 | //usage: "\n -K Log to kernel printk buffer (use dmesg to read it)"
|
---|
48 | //usage: )
|
---|
49 | //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 |
|
---|
54 | /*
|
---|
55 | * Done in syslogd_and_logger.c:
|
---|
56 | #include "libbb.h"
|
---|
57 | #define SYSLOG_NAMES
|
---|
58 | #define SYSLOG_NAMES_CONST
|
---|
59 | #include <syslog.h>
|
---|
60 | */
|
---|
61 |
|
---|
62 | #include <sys/un.h>
|
---|
63 | #include <sys/uio.h>
|
---|
64 |
|
---|
65 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
66 | #include <netinet/in.h>
|
---|
67 | #endif
|
---|
68 |
|
---|
69 | #if ENABLE_FEATURE_IPC_SYSLOG
|
---|
70 | #include <sys/ipc.h>
|
---|
71 | #include <sys/sem.h>
|
---|
72 | #include <sys/shm.h>
|
---|
73 | #endif
|
---|
74 |
|
---|
75 |
|
---|
76 | #define DEBUG 0
|
---|
77 |
|
---|
78 | /* 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 |
|
---|
83 | /* Write locking does not seem to be useful either */
|
---|
84 | #undef SYSLOGD_WRLOCK
|
---|
85 |
|
---|
86 | enum {
|
---|
87 | MAX_READ = CONFIG_FEATURE_SYSLOGD_READ_BUFFER_SIZE,
|
---|
88 | DNS_WAIT_SEC = 2 * 60,
|
---|
89 | };
|
---|
90 |
|
---|
91 | /* Semaphore operation structures */
|
---|
92 | struct shbuf_ds {
|
---|
93 | int32_t size; /* size of data - 1 */
|
---|
94 | int32_t tail; /* end of message list */
|
---|
95 | char data[1]; /* data/messages */
|
---|
96 | };
|
---|
97 |
|
---|
98 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
99 | typedef struct {
|
---|
100 | int remoteFD;
|
---|
101 | unsigned last_dns_resolve;
|
---|
102 | len_and_sockaddr *remoteAddr;
|
---|
103 | const char *remoteHostname;
|
---|
104 | } remoteHost_t;
|
---|
105 | #endif
|
---|
106 |
|
---|
107 | typedef 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
|
---|
117 | typedef 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 |
|
---|
124 | /* Allows us to have smaller initializer. Ugly. */
|
---|
125 | #define GLOBALS \
|
---|
126 | logFile_t logFile; \
|
---|
127 | /* interval between marks in seconds */ \
|
---|
128 | /*int markInterval;*/ \
|
---|
129 | /* level of messages to be logged */ \
|
---|
130 | int logLevel; \
|
---|
131 | IF_FEATURE_ROTATE_LOGFILE( \
|
---|
132 | /* max size of file before rotation */ \
|
---|
133 | unsigned logFileSize; \
|
---|
134 | /* number of rotated message files */ \
|
---|
135 | unsigned logFileRotate; \
|
---|
136 | ) \
|
---|
137 | IF_FEATURE_IPC_SYSLOG( \
|
---|
138 | 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]; \
|
---|
143 | ) \
|
---|
144 | IF_FEATURE_SYSLOGD_CFG( \
|
---|
145 | logRule_t *log_rules; \
|
---|
146 | ) \
|
---|
147 | IF_FEATURE_KMSG_SYSLOG( \
|
---|
148 | int kmsgfd; \
|
---|
149 | int primask; \
|
---|
150 | )
|
---|
151 |
|
---|
152 | struct init_globals {
|
---|
153 | GLOBALS
|
---|
154 | };
|
---|
155 |
|
---|
156 | struct globals {
|
---|
157 | GLOBALS
|
---|
158 |
|
---|
159 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
160 | llist_t *remoteHosts;
|
---|
161 | #endif
|
---|
162 | #if ENABLE_FEATURE_IPC_SYSLOG
|
---|
163 | struct shbuf_ds *shbuf;
|
---|
164 | #endif
|
---|
165 | time_t last_log_time;
|
---|
166 | /* localhost's name. We print only first 64 chars */
|
---|
167 | char *hostname;
|
---|
168 |
|
---|
169 | /* We recv into recvbuf... */
|
---|
170 | char recvbuf[MAX_READ * (1 + ENABLE_FEATURE_SYSLOGD_DUP)];
|
---|
171 | /* ...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 | };
|
---|
179 |
|
---|
180 | static const struct init_globals init_data = {
|
---|
181 | .logFile = {
|
---|
182 | .path = "/var/log/messages",
|
---|
183 | .fd = -1,
|
---|
184 | },
|
---|
185 | #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
|
---|
193 | #if ENABLE_FEATURE_IPC_SYSLOG
|
---|
194 | .shmid = -1,
|
---|
195 | .s_semid = -1,
|
---|
196 | .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), /* default shm size */
|
---|
197 | .SMwup = { {1, -1, IPC_NOWAIT} },
|
---|
198 | .SMwdn = { {0, 0}, {1, 0}, {1, +1} },
|
---|
199 | #endif
|
---|
200 | };
|
---|
201 |
|
---|
202 | #define G (*ptr_to_globals)
|
---|
203 | #define INIT_G() do { \
|
---|
204 | SET_PTR_TO_GLOBALS(memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data))); \
|
---|
205 | } while (0)
|
---|
206 |
|
---|
207 |
|
---|
208 | /* Options */
|
---|
209 | enum {
|
---|
210 | OPTBIT_mark = 0, // -m
|
---|
211 | OPTBIT_nofork, // -n
|
---|
212 | OPTBIT_outfile, // -O
|
---|
213 | OPTBIT_loglevel, // -l
|
---|
214 | OPTBIT_small, // -S
|
---|
215 | 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
|
---|
221 | IF_FEATURE_SYSLOGD_CFG( OPTBIT_cfg ,) // -f
|
---|
222 | IF_FEATURE_KMSG_SYSLOG( OPTBIT_kmsg ,) // -K
|
---|
223 |
|
---|
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 ,
|
---|
229 | 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,
|
---|
235 | OPT_cfg = IF_FEATURE_SYSLOGD_CFG( (1 << OPTBIT_cfg )) + 0,
|
---|
236 | OPT_kmsg = IF_FEATURE_KMSG_SYSLOG( (1 << OPTBIT_kmsg )) + 0,
|
---|
237 |
|
---|
238 | };
|
---|
239 | #define OPTION_STR "m:nO:l:S" \
|
---|
240 | 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::") \
|
---|
245 | IF_FEATURE_SYSLOGD_DUP( "D" ) \
|
---|
246 | IF_FEATURE_SYSLOGD_CFG( "f:" ) \
|
---|
247 | IF_FEATURE_KMSG_SYSLOG( "K" )
|
---|
248 | #define OPTION_DECL *opt_m, *opt_l \
|
---|
249 | IF_FEATURE_ROTATE_LOGFILE(,*opt_s) \
|
---|
250 | IF_FEATURE_ROTATE_LOGFILE(,*opt_b) \
|
---|
251 | 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 \
|
---|
254 | IF_FEATURE_ROTATE_LOGFILE(,&opt_s) \
|
---|
255 | IF_FEATURE_ROTATE_LOGFILE(,&opt_b) \
|
---|
256 | IF_FEATURE_REMOTE_LOG( ,&remoteAddrList) \
|
---|
257 | IF_FEATURE_IPC_SYSLOG( ,&opt_C) \
|
---|
258 | IF_FEATURE_SYSLOGD_CFG( ,&opt_f)
|
---|
259 |
|
---|
260 |
|
---|
261 | #if ENABLE_FEATURE_SYSLOGD_CFG
|
---|
262 | static 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
|
---|
271 | static 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
|
---|
281 | static 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",
|
---|
292 | file ? xfopen_for_read : fopen_for_read);
|
---|
293 | 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? */
|
---|
306 | if (tok[2])
|
---|
307 | goto cfgerr;
|
---|
308 |
|
---|
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, '.');
|
---|
327 | if (!t)
|
---|
328 | goto cfgerr;
|
---|
329 | *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 |
|
---|
403 | /* 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.
|
---|
412 | * 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:
|
---|
432 | bb_error_msg_and_die("error in '%s' at line %d",
|
---|
433 | file ? file : "/etc/syslog.conf",
|
---|
434 | parser->lineno);
|
---|
435 | }
|
---|
436 | #endif
|
---|
437 |
|
---|
438 | /* circular buffer variables/structures */
|
---|
439 | #if ENABLE_FEATURE_IPC_SYSLOG
|
---|
440 |
|
---|
441 | #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 |
|
---|
446 | /* our shared key (syslogd.c and logread.c must be in sync) */
|
---|
447 | enum { KEY_ID = 0x414e4547 }; /* "GENA" */
|
---|
448 |
|
---|
449 | static void ipcsyslog_cleanup(void)
|
---|
450 | {
|
---|
451 | if (G.shmid != -1) {
|
---|
452 | shmdt(G.shbuf);
|
---|
453 | }
|
---|
454 | if (G.shmid != -1) {
|
---|
455 | shmctl(G.shmid, IPC_RMID, NULL);
|
---|
456 | }
|
---|
457 | if (G.s_semid != -1) {
|
---|
458 | semctl(G.s_semid, 0, IPC_RMID, 0);
|
---|
459 | }
|
---|
460 | }
|
---|
461 |
|
---|
462 | static void ipcsyslog_init(void)
|
---|
463 | {
|
---|
464 | if (DEBUG)
|
---|
465 | printf("shmget(%x, %d,...)\n", (int)KEY_ID, G.shm_size);
|
---|
466 |
|
---|
467 | G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644);
|
---|
468 | if (G.shmid == -1) {
|
---|
469 | bb_perror_msg_and_die("shmget");
|
---|
470 | }
|
---|
471 |
|
---|
472 | G.shbuf = shmat(G.shmid, NULL, 0);
|
---|
473 | if (G.shbuf == (void*) -1L) { /* shmat has bizarre error return */
|
---|
474 | bb_perror_msg_and_die("shmat");
|
---|
475 | }
|
---|
476 |
|
---|
477 | 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;*/
|
---|
480 |
|
---|
481 | /* we'll trust the OS to set initial semval to 0 (let's hope) */
|
---|
482 | G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
|
---|
483 | if (G.s_semid == -1) {
|
---|
484 | if (errno == EEXIST) {
|
---|
485 | G.s_semid = semget(KEY_ID, 2, 0);
|
---|
486 | if (G.s_semid != -1)
|
---|
487 | return;
|
---|
488 | }
|
---|
489 | bb_perror_msg_and_die("semget");
|
---|
490 | }
|
---|
491 | }
|
---|
492 |
|
---|
493 | /* Write message to shared mem buffer */
|
---|
494 | static void log_to_shmem(const char *msg)
|
---|
495 | {
|
---|
496 | int old_tail, new_tail;
|
---|
497 | int len;
|
---|
498 |
|
---|
499 | if (semop(G.s_semid, G.SMwdn, 3) == -1) {
|
---|
500 | bb_perror_msg_and_die("SMwdn");
|
---|
501 | }
|
---|
502 |
|
---|
503 | /* Circular Buffer Algorithm:
|
---|
504 | * --------------------------
|
---|
505 | * tail == position where to store next syslog message.
|
---|
506 | * tail's max value is (shbuf->size - 1)
|
---|
507 | * Last byte of buffer is never used and remains NUL.
|
---|
508 | */
|
---|
509 | len = strlen(msg) + 1; /* length with NUL included */
|
---|
510 | again:
|
---|
511 | old_tail = G.shbuf->tail;
|
---|
512 | new_tail = old_tail + len;
|
---|
513 | if (new_tail < G.shbuf->size) {
|
---|
514 | /* store message, set new tail */
|
---|
515 | memcpy(G.shbuf->data + old_tail, msg, len);
|
---|
516 | G.shbuf->tail = new_tail;
|
---|
517 | } else {
|
---|
518 | /* k == available buffer space ahead of old tail */
|
---|
519 | int k = G.shbuf->size - old_tail;
|
---|
520 | /* copy what fits to the end of buffer, and repeat */
|
---|
521 | memcpy(G.shbuf->data + old_tail, msg, k);
|
---|
522 | msg += k;
|
---|
523 | len -= k;
|
---|
524 | G.shbuf->tail = 0;
|
---|
525 | goto again;
|
---|
526 | }
|
---|
527 | if (semop(G.s_semid, G.SMwup, 1) == -1) {
|
---|
528 | bb_perror_msg_and_die("SMwup");
|
---|
529 | }
|
---|
530 | if (DEBUG)
|
---|
531 | printf("tail:%d\n", G.shbuf->tail);
|
---|
532 | }
|
---|
533 | #else
|
---|
534 | static void ipcsyslog_cleanup(void) {}
|
---|
535 | static void ipcsyslog_init(void) {}
|
---|
536 | void log_to_shmem(const char *msg);
|
---|
537 | #endif /* FEATURE_IPC_SYSLOG */
|
---|
538 |
|
---|
539 | #if ENABLE_FEATURE_KMSG_SYSLOG
|
---|
540 | static 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 |
|
---|
554 | static void kmsg_cleanup(void)
|
---|
555 | {
|
---|
556 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
557 | close(G.kmsgfd);
|
---|
558 | }
|
---|
559 |
|
---|
560 | /* Write message to /dev/kmsg */
|
---|
561 | static 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
|
---|
572 | static void kmsg_init(void) {}
|
---|
573 | static void kmsg_cleanup(void) {}
|
---|
574 | static void log_to_kmsg(int pri UNUSED_PARAM, const char *msg UNUSED_PARAM) {}
|
---|
575 | #endif /* FEATURE_KMSG_SYSLOG */
|
---|
576 |
|
---|
577 | /* Print a message to the log file. */
|
---|
578 | static void log_locally(time_t now, char *msg, logFile_t *log_file)
|
---|
579 | {
|
---|
580 | #ifdef SYSLOGD_WRLOCK
|
---|
581 | struct flock fl;
|
---|
582 | #endif
|
---|
583 | int len = strlen(msg);
|
---|
584 |
|
---|
585 | if (log_file->fd >= 0) {
|
---|
586 | /* 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 | */
|
---|
591 | if (!now)
|
---|
592 | now = time(NULL);
|
---|
593 | if (G.last_log_time != now) {
|
---|
594 | G.last_log_time = now;
|
---|
595 | close(log_file->fd);
|
---|
596 | goto reopen;
|
---|
597 | }
|
---|
598 | } else {
|
---|
599 | reopen:
|
---|
600 | log_file->fd = open(log_file->path, O_WRONLY | O_CREAT
|
---|
601 | | O_NOCTTY | O_APPEND | O_NONBLOCK,
|
---|
602 | 0666);
|
---|
603 | if (log_file->fd < 0) {
|
---|
604 | /* cannot open logfile? - print to /dev/console then */
|
---|
605 | int fd = device_open(DEV_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
|
---|
606 | 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
|
---|
614 | {
|
---|
615 | struct stat statf;
|
---|
616 | log_file->isRegular = (fstat(log_file->fd, &statf) == 0 && S_ISREG(statf.st_mode));
|
---|
617 | /* bug (mostly harmless): can wrap around if file > 4gb */
|
---|
618 | log_file->size = statf.st_size;
|
---|
619 | }
|
---|
620 | #endif
|
---|
621 | }
|
---|
622 |
|
---|
623 | #ifdef SYSLOGD_WRLOCK
|
---|
624 | fl.l_whence = SEEK_SET;
|
---|
625 | fl.l_start = 0;
|
---|
626 | fl.l_len = 1;
|
---|
627 | fl.l_type = F_WRLCK;
|
---|
628 | fcntl(log_file->fd, F_SETLKW, &fl);
|
---|
629 | #endif
|
---|
630 |
|
---|
631 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
---|
632 | if (G.logFileSize && log_file->isRegular && log_file->size > G.logFileSize) {
|
---|
633 | if (G.logFileRotate) { /* always 0..99 */
|
---|
634 | int i = strlen(log_file->path) + 3 + 1;
|
---|
635 | char oldFile[i];
|
---|
636 | char newFile[i];
|
---|
637 | i = G.logFileRotate - 1;
|
---|
638 | /* rename: f.8 -> f.9; f.7 -> f.8; ... */
|
---|
639 | while (1) {
|
---|
640 | sprintf(newFile, "%s.%d", log_file->path, i);
|
---|
641 | if (i == 0) break;
|
---|
642 | sprintf(oldFile, "%s.%d", log_file->path, --i);
|
---|
643 | /* ignore errors - file might be missing */
|
---|
644 | rename(oldFile, newFile);
|
---|
645 | }
|
---|
646 | /* newFile == "f.0" now */
|
---|
647 | rename(log_file->path, newFile);
|
---|
648 | /* 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);
|
---|
656 | #ifdef SYSLOGD_WRLOCK
|
---|
657 | fl.l_type = F_UNLCK;
|
---|
658 | fcntl(log_file->fd, F_SETLKW, &fl);
|
---|
659 | #endif
|
---|
660 | close(log_file->fd);
|
---|
661 | goto reopen;
|
---|
662 | }
|
---|
663 | ftruncate(log_file->fd, 0);
|
---|
664 | }
|
---|
665 | log_file->size +=
|
---|
666 | #endif
|
---|
667 | full_write(log_file->fd, msg, len);
|
---|
668 | #ifdef SYSLOGD_WRLOCK
|
---|
669 | fl.l_type = F_UNLCK;
|
---|
670 | fcntl(log_file->fd, F_SETLKW, &fl);
|
---|
671 | #endif
|
---|
672 | }
|
---|
673 |
|
---|
674 | static void parse_fac_prio_20(int pri, char *res20)
|
---|
675 | {
|
---|
676 | const CODE *c_pri, *c_fac;
|
---|
677 |
|
---|
678 | 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;
|
---|
684 | }
|
---|
685 | }
|
---|
686 | snprintf(res20, 20, "<%d>", pri);
|
---|
687 | }
|
---|
688 |
|
---|
689 | /* len parameter is used only for "is there a timestamp?" check.
|
---|
690 | * NB: some callers cheat and supply len==0 when they know
|
---|
691 | * that there is no timestamp, short-circuiting the test. */
|
---|
692 | static void timestamp_and_log(int pri, char *msg, int len)
|
---|
693 | {
|
---|
694 | char *timestamp;
|
---|
695 | time_t now;
|
---|
696 |
|
---|
697 | /* Jan 18 00:11:22 msg... */
|
---|
698 | /* 01234567890123456 */
|
---|
699 | if (len < 16 || msg[3] != ' ' || msg[6] != ' '
|
---|
700 | || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
|
---|
701 | ) {
|
---|
702 | time(&now);
|
---|
703 | timestamp = ctime(&now) + 4; /* skip day of week */
|
---|
704 | } else {
|
---|
705 | now = 0;
|
---|
706 | timestamp = msg;
|
---|
707 | msg += 16;
|
---|
708 | }
|
---|
709 | timestamp[15] = '\0';
|
---|
710 |
|
---|
711 | if (option_mask32 & OPT_kmsg) {
|
---|
712 | log_to_kmsg(pri, msg);
|
---|
713 | return;
|
---|
714 | }
|
---|
715 |
|
---|
716 | 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);
|
---|
721 | sprintf(G.printbuf, "%s %.64s %s %s\n", timestamp, G.hostname, res, msg);
|
---|
722 | }
|
---|
723 |
|
---|
724 | /* Log message locally (to file or shared mem) */
|
---|
725 | #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) {
|
---|
745 | log_to_shmem(G.printbuf);
|
---|
746 | return;
|
---|
747 | }
|
---|
748 | #endif
|
---|
749 | log_locally(now, G.printbuf, &G.logFile);
|
---|
750 | }
|
---|
751 | }
|
---|
752 |
|
---|
753 | static void timestamp_and_log_internal(const char *msg)
|
---|
754 | {
|
---|
755 | /* -L, or no -R */
|
---|
756 | if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog))
|
---|
757 | return;
|
---|
758 | timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)msg, 0);
|
---|
759 | }
|
---|
760 |
|
---|
761 | /* 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. */
|
---|
764 | static void split_escape_and_log(char *tmpbuf, int len)
|
---|
765 | {
|
---|
766 | char *p = tmpbuf;
|
---|
767 |
|
---|
768 | tmpbuf += len;
|
---|
769 | while (p < tmpbuf) {
|
---|
770 | char c;
|
---|
771 | char *q = G.parsebuf;
|
---|
772 | int pri = (LOG_USER | LOG_NOTICE);
|
---|
773 |
|
---|
774 | if (*p == '<') {
|
---|
775 | /* Parse the magic priority number */
|
---|
776 | pri = bb_strtou(p + 1, &p, 10);
|
---|
777 | if (*p == '>')
|
---|
778 | p++;
|
---|
779 | if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
|
---|
780 | pri = (LOG_USER | LOG_NOTICE);
|
---|
781 | }
|
---|
782 |
|
---|
783 | while ((c = *p++)) {
|
---|
784 | if (c == '\n')
|
---|
785 | c = ' ';
|
---|
786 | if (!(c & ~0x1f) && c != '\t') {
|
---|
787 | *q++ = '^';
|
---|
788 | c += '@'; /* ^@, ^A, ^B... */
|
---|
789 | }
|
---|
790 | *q++ = c;
|
---|
791 | }
|
---|
792 | *q = '\0';
|
---|
793 |
|
---|
794 | /* Now log it */
|
---|
795 | timestamp_and_log(pri, G.parsebuf, q - G.parsebuf);
|
---|
796 | }
|
---|
797 | }
|
---|
798 |
|
---|
799 | #ifdef SYSLOGD_MARK
|
---|
800 | static void do_mark(int sig)
|
---|
801 | {
|
---|
802 | if (G.markInterval) {
|
---|
803 | timestamp_and_log_internal("-- MARK --");
|
---|
804 | alarm(G.markInterval);
|
---|
805 | }
|
---|
806 | }
|
---|
807 | #endif
|
---|
808 |
|
---|
809 | /* Don't inline: prevent struct sockaddr_un to take up space on stack
|
---|
810 | * permanently */
|
---|
811 | static NOINLINE int create_socket(void)
|
---|
812 | {
|
---|
813 | struct sockaddr_un sunx;
|
---|
814 | int sock_fd;
|
---|
815 | char *dev_log_name;
|
---|
816 |
|
---|
817 | #if ENABLE_FEATURE_SYSTEMD
|
---|
818 | if (sd_listen_fds() == 1)
|
---|
819 | return SD_LISTEN_FDS_START;
|
---|
820 | #endif
|
---|
821 |
|
---|
822 | 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 |
|
---|
842 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
843 | static int try_to_resolve_remote(remoteHost_t *rh)
|
---|
844 | {
|
---|
845 | if (!rh->remoteAddr) {
|
---|
846 | unsigned now = monotonic_sec();
|
---|
847 |
|
---|
848 | /* Don't resolve name too often - DNS timeouts can be big */
|
---|
849 | if ((now - rh->last_dns_resolve) < DNS_WAIT_SEC)
|
---|
850 | return -1;
|
---|
851 | rh->last_dns_resolve = now;
|
---|
852 | rh->remoteAddr = host2sockaddr(rh->remoteHostname, 514);
|
---|
853 | if (!rh->remoteAddr)
|
---|
854 | return -1;
|
---|
855 | }
|
---|
856 | return xsocket(rh->remoteAddr->u.sa.sa_family, SOCK_DGRAM, 0);
|
---|
857 | }
|
---|
858 | #endif
|
---|
859 |
|
---|
860 | static void do_syslogd(void) NORETURN;
|
---|
861 | static void do_syslogd(void)
|
---|
862 | {
|
---|
863 | int sock_fd;
|
---|
864 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
865 | llist_t *item;
|
---|
866 | #endif
|
---|
867 | #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
|
---|
874 |
|
---|
875 | /* 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);
|
---|
879 | signal(SIGHUP, SIG_IGN);
|
---|
880 | #ifdef SYSLOGD_MARK
|
---|
881 | signal(SIGALRM, do_mark);
|
---|
882 | alarm(G.markInterval);
|
---|
883 | #endif
|
---|
884 | sock_fd = create_socket();
|
---|
885 |
|
---|
886 | if (option_mask32 & OPT_circularlog)
|
---|
887 | ipcsyslog_init();
|
---|
888 |
|
---|
889 | if (option_mask32 & OPT_kmsg)
|
---|
890 | kmsg_init();
|
---|
891 |
|
---|
892 | timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER);
|
---|
893 |
|
---|
894 | while (!bb_got_signal) {
|
---|
895 | ssize_t sz;
|
---|
896 |
|
---|
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
|
---|
904 | read_again:
|
---|
905 | 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 | }
|
---|
911 |
|
---|
912 | /* Drop trailing '\n' and NULs (typically there is one NUL) */
|
---|
913 | while (1) {
|
---|
914 | if (sz == 0)
|
---|
915 | goto read_again;
|
---|
916 | /* 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,
|
---|
919 | * syslog(prio, "test\n") sends "test\n\0".
|
---|
920 | * IOW: newline is passed verbatim!
|
---|
921 | * I take it to mean that it's syslogd's job
|
---|
922 | * to make those look identical in the log files. */
|
---|
923 | if (recvbuf[sz-1] != '\0' && recvbuf[sz-1] != '\n')
|
---|
924 | break;
|
---|
925 | sz--;
|
---|
926 | }
|
---|
927 | #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
|
---|
933 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
934 | /* Stock syslogd sends it '\n'-terminated
|
---|
935 | * over network, mimic that */
|
---|
936 | recvbuf[sz] = '\n';
|
---|
937 |
|
---|
938 | /* We are not modifying log messages in any way before send */
|
---|
939 | /* Remote site cannot trust _us_ anyway and need to do validation again */
|
---|
940 | 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;
|
---|
947 | }
|
---|
948 |
|
---|
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 | }
|
---|
967 | }
|
---|
968 | #endif
|
---|
969 | if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
|
---|
970 | recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */
|
---|
971 | split_escape_and_log(recvbuf, sz);
|
---|
972 | }
|
---|
973 | } /* while (!bb_got_signal) */
|
---|
974 |
|
---|
975 | timestamp_and_log_internal("syslogd exiting");
|
---|
976 | puts("syslogd exiting");
|
---|
977 | remove_pidfile(CONFIG_PID_FILE_PATH "/syslogd.pid");
|
---|
978 | ipcsyslog_cleanup();
|
---|
979 | if (option_mask32 & OPT_kmsg)
|
---|
980 | kmsg_cleanup();
|
---|
981 | kill_myself_with_sig(bb_got_signal);
|
---|
982 | #undef recvbuf
|
---|
983 | }
|
---|
984 |
|
---|
985 | int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
986 | int syslogd_main(int argc UNUSED_PARAM, char **argv)
|
---|
987 | {
|
---|
988 | int opts;
|
---|
989 | char OPTION_DECL;
|
---|
990 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
991 | llist_t *remoteAddrList = NULL;
|
---|
992 | #endif
|
---|
993 |
|
---|
994 | INIT_G();
|
---|
995 |
|
---|
996 | /* No non-option params, -R can occur multiple times */
|
---|
997 | opt_complementary = "=0" IF_FEATURE_REMOTE_LOG(":R::");
|
---|
998 | opts = getopt32(argv, OPTION_STR, OPTION_PARAM);
|
---|
999 | #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 |
|
---|
1009 | #ifdef SYSLOGD_MARK
|
---|
1010 | if (opts & OPT_mark) // -m
|
---|
1011 | G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
|
---|
1012 | #endif
|
---|
1013 | //if (opts & OPT_nofork) // -n
|
---|
1014 | //if (opts & OPT_outfile) // -O
|
---|
1015 | if (opts & OPT_loglevel) // -l
|
---|
1016 | G.logLevel = xatou_range(opt_l, 1, 8);
|
---|
1017 | //if (opts & OPT_small) // -S
|
---|
1018 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
---|
1019 | if (opts & OPT_filesize) // -s
|
---|
1020 | G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
|
---|
1021 | if (opts & OPT_rotatecnt) // -b
|
---|
1022 | G.logFileRotate = xatou_range(opt_b, 0, 99);
|
---|
1023 | #endif
|
---|
1024 | #if ENABLE_FEATURE_IPC_SYSLOG
|
---|
1025 | if (opt_C) // -Cn
|
---|
1026 | G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
|
---|
1027 | #endif
|
---|
1028 | /* If they have not specified remote logging, then log locally */
|
---|
1029 | if (ENABLE_FEATURE_REMOTE_LOG && !(opts & OPT_remotelog)) // -R
|
---|
1030 | option_mask32 |= OPT_locallog;
|
---|
1031 | #if ENABLE_FEATURE_SYSLOGD_CFG
|
---|
1032 | parse_syslogdcfg(opt_f);
|
---|
1033 | #endif
|
---|
1034 |
|
---|
1035 | /* Store away localhost's name before the fork */
|
---|
1036 | G.hostname = safe_gethostname();
|
---|
1037 | *strchrnul(G.hostname, '.') = '\0';
|
---|
1038 |
|
---|
1039 | if (!(opts & OPT_nofork)) {
|
---|
1040 | bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
|
---|
1041 | }
|
---|
1042 |
|
---|
1043 | //umask(0); - why??
|
---|
1044 | write_pidfile(CONFIG_PID_FILE_PATH "/syslogd.pid");
|
---|
1045 |
|
---|
1046 | do_syslogd();
|
---|
1047 | /* return EXIT_SUCCESS; */
|
---|
1048 | }
|
---|
1049 |
|
---|
1050 | /* Clean up. Needed because we are included from syslogd_and_logger.c */
|
---|
1051 | #undef DEBUG
|
---|
1052 | #undef SYSLOGD_MARK
|
---|
1053 | #undef SYSLOGD_WRLOCK
|
---|
1054 | #undef G
|
---|
1055 | #undef GLOBALS
|
---|
1056 | #undef INIT_G
|
---|
1057 | #undef OPTION_STR
|
---|
1058 | #undef OPTION_DECL
|
---|
1059 | #undef OPTION_PARAM
|
---|