4 Copyright (C) Andrew Tridgell 2008
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, see <http://www.gnu.org/licenses/>.
21 #include "lib/events/events.h"
22 #include "../include/ctdb.h"
23 #include "../include/ctdb_private.h"
24 #include "system/syslog.h"
25 #include "system/time.h"
26 #include "system/filesys.h"
28 struct syslog_message {
35 struct ctdb_syslog_state {
40 static int syslogd_is_started = 0;
43 /* called when child is finished
44 * this is for the syslog daemon, we can not use DEBUG here
46 static void ctdb_syslog_handler(struct event_context *ev, struct fd_event *fde,
47 uint16_t flags, void *p)
49 struct ctdb_syslog_state *state = talloc_get_type(p, struct ctdb_syslog_state);
53 struct syslog_message *msg;
59 count = recv(state->syslog_fd, str, sizeof(str), 0);
60 if (count < sizeof(struct syslog_message)) {
63 msg = (struct syslog_message *)str;
65 syslog(msg->level, "%s", msg->message);
69 /* called when the pipd from the main daemon has closed
70 * this is for the syslog daemon, we can not use DEBUG here
72 static void ctdb_syslog_terminate_handler(struct event_context *ev, struct fd_event *fde,
73 uint16_t flags, void *p)
75 syslog(LOG_ERR, "Shutting down SYSLOG daemon with pid:%d", (int)getpid());
82 * this is for the syslog daemon, we can not use DEBUG here
84 int start_syslog_daemon(struct ctdb_context *ctdb)
86 struct sockaddr_in syslog_sin;
87 struct ctdb_syslog_state *state;
89 state = talloc(ctdb, struct ctdb_syslog_state);
90 CTDB_NO_MEMORY(ctdb, state);
92 if (pipe(state->fd) != 0) {
93 printf("Failed to create syslog pipe\n");
98 ctdb->syslogd_pid = fork();
99 if (ctdb->syslogd_pid == (pid_t)-1) {
100 printf("Failed to create syslog child process\n");
107 syslogd_is_started = 1;
109 if (ctdb->syslogd_pid != 0) {
110 DEBUG(DEBUG_ERR,("Starting SYSLOG child process with pid:%d\n", (int)ctdb->syslogd_pid));
113 set_close_on_exec(state->fd[0]);
118 talloc_free(ctdb->ev);
119 ctdb->ev = event_context_init(NULL);
121 syslog(LOG_ERR, "Starting SYSLOG daemon with pid:%d", (int)getpid());
124 set_close_on_exec(state->fd[1]);
125 event_add_fd(ctdb->ev, state, state->fd[1], EVENT_FD_READ|EVENT_FD_AUTOCLOSE,
126 ctdb_syslog_terminate_handler, state);
128 state->syslog_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
129 if (state->syslog_fd == -1) {
130 printf("Failed to create syslog socket\n");
134 set_close_on_exec(state->syslog_fd);
136 syslog_sin.sin_family = AF_INET;
137 syslog_sin.sin_port = htons(CTDB_PORT);
138 syslog_sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
140 if (bind(state->syslog_fd, &syslog_sin, sizeof(syslog_sin)) == -1) {
141 if (errno == EADDRINUSE) {
142 /* this is ok, we already have a syslog daemon */
145 printf("syslog daemon failed to bind to socket. errno:%d(%s)\n", errno, strerror(errno));
150 event_add_fd(ctdb->ev, state, state->syslog_fd, EVENT_FD_READ|EVENT_FD_AUTOCLOSE,
151 ctdb_syslog_handler, state);
153 event_loop_wait(ctdb->ev);
155 /* this should not happen */
159 struct ctdb_log_state {
160 struct ctdb_context *ctdb;
165 void (*logfn)(const char *, uint16_t, void *);
169 /* we need this global to keep the DEBUG() syntax */
170 static struct ctdb_log_state *log_state;
173 syslog logging function
175 static void ctdb_syslog_log(const char *format, va_list ap)
177 struct syslog_message *msg;
178 int level = LOG_DEBUG;
182 struct sockaddr_in syslog_sin;
184 ret = vasprintf(&s, format, ap);
189 switch (this_log_level) {
216 len = offsetof(struct syslog_message, message) + strlen(s) + 1;
223 msg->len = strlen(s);
224 strcpy(msg->message, s);
226 if (syslogd_is_started == 0) {
227 syslog(msg->level, "%s", msg->message);
229 syslog_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
230 if (syslog_fd == -1) {
231 printf("Failed to create syslog socket\n");
237 syslog_sin.sin_family = AF_INET;
238 syslog_sin.sin_port = htons(CTDB_PORT);
239 syslog_sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
242 ret = sendto(syslog_fd, msg, len, 0, &syslog_sin, sizeof(syslog_sin));
243 /* no point in checking here since we cant log an error */
254 log file logging function
256 static void ctdb_logfile_log(const char *format, va_list ap)
265 ret = vasprintf(&s, format, ap);
267 const char *errstr = "vasprintf failed\n";
269 write(log_state->fd, errstr, strlen(errstr));
273 t = timeval_current();
274 tm = localtime(&t.tv_sec);
276 strftime(tbuf,sizeof(tbuf)-1,"%Y/%m/%d %H:%M:%S", tm);
278 ret = asprintf(&s2, "%s.%06u [%5u]: %s",
279 tbuf, (unsigned)t.tv_usec, (unsigned)getpid(), s);
282 const char *errstr = "asprintf failed\n";
283 write(log_state->fd, errstr, strlen(errstr));
287 write(log_state->fd, s2, strlen(s2));
292 static void ctdb_logfile_log_add(const char *format, va_list ap)
297 ret = vasprintf(&s, format, ap);
299 const char *errstr = "vasprintf failed\n";
301 write(log_state->fd, errstr, strlen(errstr));
306 write(log_state->fd, s, strlen(s));
314 choose the logfile location
316 int ctdb_set_logfile(struct ctdb_context *ctdb, const char *logfile, bool use_syslog)
320 ctdb->log = talloc_zero(ctdb, struct ctdb_log_state);
321 if (ctdb->log == NULL) {
322 printf("talloc_zero failed\n");
326 ctdb->log->ctdb = ctdb;
327 log_state = ctdb->log;
330 do_debug_v = ctdb_syslog_log;
331 do_debug_add_v = ctdb_syslog_log;
332 ctdb->log->use_syslog = true;
333 } else if (logfile == NULL || strcmp(logfile, "-") == 0) {
334 do_debug_v = ctdb_logfile_log;
335 do_debug_add_v = ctdb_logfile_log_add;
337 /* also catch stderr of subcommands to stdout */
340 printf("dup2 failed: %s\n", strerror(errno));
344 do_debug_v = ctdb_logfile_log;
345 do_debug_add_v = ctdb_logfile_log_add;
347 ctdb->log->fd = open(logfile, O_WRONLY|O_APPEND|O_CREAT, 0666);
348 if (ctdb->log->fd == -1) {
349 printf("Failed to open logfile %s\n", logfile);
357 /* Note that do_debug always uses the global log state. */
358 static void write_to_log(struct ctdb_log_state *log,
359 const char *buf, unsigned int len)
361 if (script_log_level <= LogLevel) {
362 do_debug("%*.*s\n", len, len, buf);
363 /* log it in the eventsystem as well */
365 log->logfn(log->buf, len, log->logfn_private);
370 called when log data comes in from a child process
372 static void ctdb_log_handler(struct event_context *ev, struct fd_event *fde,
373 uint16_t flags, void *private)
375 struct ctdb_log_state *log = talloc_get_type(private, struct ctdb_log_state);
379 if (!(flags & EVENT_FD_READ)) {
383 n = read(log->pfd, &log->buf[log->buf_used],
384 sizeof(log->buf) - log->buf_used);
388 if (log != log_state) {
394 this_log_level = script_log_level;
396 while (log->buf_used > 0 &&
397 (p = memchr(log->buf, '\n', log->buf_used)) != NULL) {
398 int n1 = (p - log->buf)+1;
400 /* swallow \r from child processes */
401 if (n2 > 0 && log->buf[n2-1] == '\r') {
404 write_to_log(log, log->buf, n2);
405 memmove(log->buf, p+1, sizeof(log->buf) - n1);
409 /* the buffer could have completely filled - unfortunately we have
410 no choice but to dump it out straight away */
411 if (log->buf_used == sizeof(log->buf)) {
412 write_to_log(log, log->buf, log->buf_used);
417 static int log_context_destructor(struct ctdb_log_state *log)
419 /* Flush buffer in case it wasn't \n-terminated. */
420 if (log->buf_used > 0) {
421 this_log_level = script_log_level;
422 write_to_log(log, log->buf, log->buf_used);
428 fork(), redirecting child output to logging and specified callback.
430 struct ctdb_log_state *ctdb_fork_with_logging(TALLOC_CTX *mem_ctx,
431 struct ctdb_context *ctdb,
432 void (*logfn)(const char *, uint16_t, void *),
433 void *logfn_private, pid_t *pid)
436 struct ctdb_log_state *log;
438 log = talloc_zero(mem_ctx, struct ctdb_log_state);
439 CTDB_NO_MEMORY_NULL(ctdb, log);
442 log->logfn_private = (void *)logfn_private;
445 DEBUG(DEBUG_ERR,(__location__ " Failed to setup for child logging pipe\n"));
453 close(STDOUT_FILENO);
454 close(STDERR_FILENO);
455 dup2(p[1], STDOUT_FILENO);
456 dup2(p[1], STDERR_FILENO);
465 DEBUG(DEBUG_ERR, (__location__ " fork failed for child process\n"));
471 set_close_on_exec(log->pfd);
472 talloc_set_destructor(log, log_context_destructor);
473 event_add_fd(ctdb->ev, log, log->pfd,
474 EVENT_FD_READ | EVENT_FD_AUTOCLOSE,
475 ctdb_log_handler, log);
484 setup for logging of child process stdout
486 int ctdb_set_child_logging(struct ctdb_context *ctdb)
489 int old_stdout, old_stderr;
491 if (ctdb->log->fd == STDOUT_FILENO) {
492 /* not needed for stdout logging */
496 /* setup a pipe to catch IO from subprocesses */
498 DEBUG(DEBUG_ERR,(__location__ " Failed to setup for child logging pipe\n"));
502 /* We'll fail if stderr/stdout not already open; it's simpler. */
503 old_stdout = dup(STDOUT_FILENO);
504 old_stderr = dup(STDERR_FILENO);
505 if (dup2(p[1], STDOUT_FILENO) < 0 || dup2(p[1], STDERR_FILENO) < 0) {
506 int saved_errno = errno;
507 dup2(old_stdout, STDOUT_FILENO);
508 dup2(old_stderr, STDERR_FILENO);
515 printf(__location__ " dup2 failed: %s\n",
523 /* Is this correct for STDOUT and STDERR ? */
524 set_close_on_exec(STDOUT_FILENO);
525 set_close_on_exec(STDERR_FILENO);
526 set_close_on_exec(p[0]);
528 event_add_fd(ctdb->ev, ctdb->log, p[0],
529 EVENT_FD_READ | EVENT_FD_AUTOCLOSE,
530 ctdb_log_handler, ctdb->log);
531 ctdb->log->pfd = p[0];
533 DEBUG(DEBUG_DEBUG, (__location__ " Created PIPE FD:%d for logging\n", p[0]));