moonbridge
view moonbridge.c @ 278:d4c82c90d244
Make moonbridge_io.signalsocket(...) return a new socket each time it is called
| author | jbe |
|---|---|
| date | Tue Jun 06 20:01:29 2017 +0200 (2017-06-06) |
| parents | 4f965eda4c2f |
| children | 850f5c8fec37 |
line source
2 /*** Version ***/
3 #define MOONBR_VERSION_STRING "1.0.1"
6 /*** Compile-time configuration ***/
8 #define MOONBR_LUA_PANIC_BUG_WORKAROUND 1
11 /*** C preprocessor macros for portability support ***/
13 #ifndef __has_include
14 #define __has_include(x) 0
15 #endif
18 /*** Include directives for used system libraries ***/
20 #include <stdlib.h>
21 #include <stdint.h>
22 #include <string.h>
23 #include <errno.h>
24 #include <unistd.h>
25 #include <signal.h>
26 #include <sys/wait.h>
27 #include <sys/resource.h>
28 #include <poll.h>
29 #include <time.h>
30 #include <sys/time.h>
31 #include <sys/socket.h>
32 #include <sys/un.h>
33 #include <netinet/in.h>
34 #include <netdb.h>
35 #include <arpa/inet.h>
36 #include <getopt.h>
37 #include <sys/file.h>
38 #include <syslog.h>
39 #if defined(__FreeBSD__) || __has_include(<libutil.h>)
40 #include <libutil.h>
41 #endif
42 #if defined(__linux__) || __has_include(<bsd/libutil.h>)
43 #include <bsd/libutil.h>
44 #endif
45 #if defined(__linux__) || __has_include(<bsd/unistd.h>)
46 #include <bsd/unistd.h>
47 #endif
50 /*** Fallback definitions for missing constants on some platforms ***/
52 /* INFTIM is used as timeout parameter for poll() */
53 #ifndef INFTIM
54 #define INFTIM -1
55 #endif
58 /*** Include directives for Lua ***/
60 #include <lua.h>
61 #include <lauxlib.h>
62 #include <lualib.h>
65 /*** Include directive for moonbridge_io library ***/
67 #include "moonbridge_io.h"
70 /*** Constants ***/
72 /* Backlog option for listen() call */
73 #define MOONBR_LISTEN_BACKLOG 1024
75 /* Maximum length of a timestamp used for strftime() */
76 #define MOONBR_LOG_MAXTIMELEN 40
78 /* Maximum length of a log message */
79 #define MOONBR_LOG_MAXMSGLEN 4095
81 /* Exitcodes passed to exit() call */
82 #define MOONBR_EXITCODE_GRACEFUL 0
83 #define MOONBR_EXITCODE_CMDLINEERROR 1
84 #define MOONBR_EXITCODE_ALREADYRUNNING 2
85 #define MOONBR_EXITCODE_STARTUPERROR 3
86 #define MOONBR_EXITCODE_RUNTIMEERROR 4
88 /* Maximum length of a line sent to stderr by child processes */
89 #define MOONBR_MAXERRORLINELEN 1024
91 /* Maximum length of an error string returned by strerror() */
92 #define MOONBR_MAXSTRERRORLEN 80
94 /* Error message for noncompliant strerror_r() implementation on GNU systems */
95 #define MOONBR_STRERROR_R_MSG "Error detail unavailable due to noncompliant strerror_r() implementation"
97 /* Status bytes exchanged between master and child processes */
98 #define MOONBR_STATUS_IDLE 'I'
99 #define MOONBR_COMMAND_CONNECT 'C'
100 #define MOONBR_COMMAND_TERMINATE 'T'
101 #define MOONBR_STATUS_GOODBYE 'B'
103 /* Constant file descriptors */
104 #define MOONBR_FD_STDERR 2
105 #define MOONBR_FD_CONTROL 3
106 #define MOONBR_FD_END 4
108 /* Return values of moonbr_try_destroy_worker() */
109 #define MOONBR_DESTROY_NONE 0
110 #define MOONBR_DESTROY_PREPARE 1
111 #define MOONBR_DESTROY_IDLE_OR_ASSIGNED 2
114 /*** Types ***/
116 /* Enum for 'moonbr_pstate' */
117 #define MOONBR_PSTATE_STARTUP 0
118 #define MOONBR_PSTATE_RUNNING 1
119 #define MOONBR_PSTATE_FORKED 2
121 /* Enum for 'proto' field of struct moonbr_listener */
122 #define MOONBR_PROTO_INTERVAL 1
123 #define MOONBR_PROTO_LOCAL 2
124 #define MOONBR_PROTO_TCP 3
126 /* Data structure for a pool's listener that can accept incoming connections */
127 struct moonbr_listener {
128 struct moonbr_pool *pool;
129 struct moonbr_listener *prev_listener; /* previous idle or(!) connected listener */
130 struct moonbr_listener *next_listener; /* next idle or(!) connected listener */
131 int proto;
132 union {
133 struct {
134 char *name; /* name of interval passed to 'connect' function as 'interval' field in table */
135 int main; /* nonzero = termination of 'connect' function causes shutdown */
136 int strict; /* nonzero = runtime of 'connect' function does not delay interval */
137 struct timeval delay; /* interval between invocations of 'connect' function */
138 struct timeval wakeup; /* point in time of next invocation */
139 } interval;
140 struct {
141 union {
142 struct sockaddr addr_abstract;
143 struct sockaddr_un addr_un;
144 struct sockaddr_in addr_in;
145 struct sockaddr_in6 addr_in6;
146 } addr;
147 socklen_t addrlen;
148 } socket;
149 } type_specific;
150 union {
151 struct {
152 char ip[INET6_ADDRSTRLEN]; /* IP to listen on */
153 int port; /* port number to listen on (in host endianess) */
154 } tcp;
155 } proto_specific;
156 int listenfd; /* -1 = none */
157 int pollidx; /* -1 = none */
158 };
160 /* Data structure for a child process that is handling incoming connections */
161 struct moonbr_worker {
162 struct moonbr_pool *pool;
163 struct moonbr_worker *prev_worker;
164 struct moonbr_worker *next_worker;
165 struct moonbr_worker *prev_idle_worker;
166 struct moonbr_worker *next_idle_worker;
167 int main; /* nonzero = terminate Moonbridge when this worker dies */
168 int idle; /* nonzero = waiting for command from parent process */
169 int assigned; /* nonzero = currently handling a connection */
170 pid_t pid;
171 int controlfd; /* socket to send/receive control message to/from child process */
172 int errorfd; /* socket to receive error output from child process' stderr */
173 char *errorlinebuf; /* optional buffer for collecting stderr data from child process */
174 int errorlinelen; /* number of bytes stored in 'errorlinebuf' */
175 int errorlineovf; /* nonzero = line length overflow */
176 struct timeval idle_expiration; /* point in time until child process may stay in idle state */
177 struct moonbr_listener *restart_interval_listener; /* set while interval listener is assigned */
178 };
180 /* Data structure for a pool of workers and listeners */
181 struct moonbr_pool {
182 int poolnum; /* number of pool for log output */
183 struct moonbr_pool *next_pool; /* next entry in linked list starting with 'moonbr_first_pool' */
184 struct moonbr_worker *first_worker; /* first worker of pool */
185 struct moonbr_worker *last_worker; /* last worker of pool */
186 struct moonbr_worker *first_idle_worker; /* first idle worker of pool */
187 struct moonbr_worker *last_idle_worker; /* last idle worker of pool */
188 int idle_worker_count;
189 int unassigned_worker_count;
190 int total_worker_count;
191 int worker_count_stat; /* only needed for statistics */
192 int pre_fork; /* desired minimum number of unassigned workers */
193 int min_fork; /* desired minimum number of workers in total */
194 int max_fork; /* maximum number of workers */
195 struct timeval fork_delay; /* delay after each fork() until a fork may happen again */
196 struct timeval fork_wakeup; /* point in time when a fork may happen again (unless a worker terminates before) */
197 struct timeval fork_error_delay; /* delay between fork()s when an error during fork or preparation occurred */
198 struct timeval fork_error_wakeup; /* point in time when fork may happen again if an error in preparation occurred */
199 int use_fork_error_wakeup; /* nonzero = error in preparation occured; gets reset on next fork */
200 struct timeval exit_delay; /* delay for terminating excessive workers (unassigned_worker_count > pre_fork) */
201 struct timeval exit_wakeup; /* point in time when terminating an excessive worker */
202 struct timeval idle_timeout; /* delay before an idle worker is terminated */
203 size_t memory_limit; /* maximum bytes of memory that the Lua machine may allocate */
204 int listener_count; /* total number of listeners of pool (and size of 'listener' array at end of this struct) */
205 struct moonbr_listener *first_idle_listener; /* first listener that is idle (i.e. has no waiting connection) */
206 struct moonbr_listener *last_idle_listener; /* last listener that is idle (i.e. has no waiting connection) */
207 struct moonbr_listener *first_connected_listener; /* first listener that has a pending connection */
208 struct moonbr_listener *last_connected_listener; /* last listener that has a pending connection */
209 struct moonbr_listener listener[1]; /* static array of variable(!) size to contain 'listener' structures */
210 };
212 /* Enum for 'channel' field of struct moonbr_poll_worker */
213 #define MOONBR_POLL_WORKER_CONTROLCHANNEL 1
214 #define MOONBR_POLL_WORKER_ERRORCHANNEL 2
216 /* Structure to refer from 'moonbr_poll_worker_fds' entry to worker structure */
217 struct moonbr_poll_worker {
218 struct moonbr_worker *worker;
219 int channel; /* field indicating whether file descriptor is 'controlfd' or 'errorfd' */
220 };
222 /* Variable indicating that clean shutdown was requested */
223 static int moonbr_shutdown_in_progress = 0;
226 /*** Macros for Lua registry ***/
228 /* Lightuserdata keys for Lua registry to store 'prepare', 'connect', and 'finish' functions */
229 #define moonbr_luakey_prepare_func(pool) ((void *)(intptr_t)(pool) + 0)
230 #define moonbr_luakey_connect_func(pool) ((void *)(intptr_t)(pool) + 1)
231 #define moonbr_luakey_finish_func(pool) ((void *)(intptr_t)(pool) + 2)
234 /*** Global variables ***/
236 /* State of process execution */
237 static int moonbr_pstate = MOONBR_PSTATE_STARTUP;
239 /* Process ID of the main process */
240 static pid_t moonbr_masterpid;
242 /* Condition variables set by the signal handler */
243 static volatile sig_atomic_t moonbr_cond_poll = 0;
244 static volatile sig_atomic_t moonbr_cond_terminate = 0;
245 static volatile sig_atomic_t moonbr_cond_interrupt = 0;
246 static volatile sig_atomic_t moonbr_cond_child = 0;
248 /* Socket pair to denote signal delivery when signal handler was called just before poll() */
249 static int moonbr_poll_signalfds[2];
250 #define moonbr_poll_signalfd_read moonbr_poll_signalfds[0]
251 #define moonbr_poll_signalfd_write moonbr_poll_signalfds[1]
253 /* Global variables for pidfile and logging */
254 static struct pidfh *moonbr_pidfh = NULL;
255 static FILE *moonbr_logfile = NULL;
256 static int moonbr_use_syslog = 0;
258 /* First and last entry of linked list of all created pools during initialization */
259 static struct moonbr_pool *moonbr_first_pool = NULL;
260 static struct moonbr_pool *moonbr_last_pool = NULL;
262 /* Total count of pools */
263 static int moonbr_pool_count = 0;
265 /* Set to a nonzero value if dynamic part of 'moonbr_poll_fds' ('moonbr_poll_worker_fds') needs an update */
266 static int moonbr_poll_refresh_needed = 0;
268 /* Array passed to poll(), consisting of static part and dynamic part ('moonbr_poll_worker_fds') */
269 static struct pollfd *moonbr_poll_fds = NULL; /* the array */
270 static int moonbr_poll_fds_bufsize = 0; /* memory allocated for this number of elements */
271 static int moonbr_poll_fds_count = 0; /* total number of elements */
272 static int moonbr_poll_fds_static_count; /* number of elements in static part */
274 /* Dynamic part of 'moonbr_poll_fds' array */
275 #define moonbr_poll_worker_fds (moonbr_poll_fds+moonbr_poll_fds_static_count)
277 /* Additional information for dynamic part of 'moonbr_poll_fds' array */
278 struct moonbr_poll_worker *moonbr_poll_workers; /* the array */
279 static int moonbr_poll_workers_bufsize = 0; /* memory allocated for this number of elements */
280 static int moonbr_poll_worker_count = 0; /* number of elements in array */
282 /* Variable set to nonzero value to disallow further calls of 'listen' function */
283 static int moonbr_booted = 0;
285 /* Verbosity settings */
286 static int moonbr_debug = 0;
287 static int moonbr_stat = 0;
289 /* Memory consumption by Lua machine */
290 static size_t moonbr_memory_usage = 0;
291 static size_t moonbr_memory_limit = 0;
294 /*** Functions for signal handling ***/
296 /* Signal handler for master and child processes */
297 static void moonbr_signal(int sig) {
298 int errno2 = errno; /* backup errno variable */
299 if (getpid() == moonbr_masterpid) {
300 /* master process */
301 switch (sig) {
302 case SIGHUP:
303 case SIGINT:
304 /* fast shutdown requested */
305 moonbr_cond_interrupt = 1;
306 break;
307 case SIGTERM:
308 /* clean shutdown requested */
309 moonbr_cond_terminate = 1;
310 break;
311 case SIGCHLD:
312 /* child process terminated */
313 moonbr_cond_child = 1;
314 break;
315 }
316 if (moonbr_cond_poll) {
317 /* avoid race condition if signal handler is invoked right before poll() */
318 char buf[1] = {0};
319 write(moonbr_poll_signalfd_write, buf, 1);
320 }
321 } else {
322 /* child process forwards certain signals to parent process */
323 switch (sig) {
324 case SIGHUP:
325 case SIGINT:
326 kill(moonbr_masterpid, sig);
327 }
328 }
329 errno = errno2; /* restore errno from backup */
330 }
332 /* Initialize signal handling */
333 static void moonbr_signal_init(){
334 moonbr_masterpid = getpid();
335 signal(SIGHUP, moonbr_signal);
336 signal(SIGINT, moonbr_signal);
337 signal(SIGTERM, moonbr_signal);
338 signal(SIGCHLD, moonbr_signal);
339 }
342 /*** Functions for logging in master process ***/
344 /* Logs a pre-formatted message with given syslog() priority */
345 static void moonbr_log_msg(int priority, const char *msg) {
346 if (moonbr_logfile) {
347 /* logging to logfile desired (timestamp is prepended in that case) */
348 time_t now_time = 0;
349 struct tm now_tmstruct;
350 char timestr[MOONBR_LOG_MAXTIMELEN+1];
351 time(&now_time);
352 localtime_r(&now_time, &now_tmstruct);
353 if (!strftime(
354 timestr, MOONBR_LOG_MAXTIMELEN+1, "%Y-%m-%d %H:%M:%S %Z: ", &now_tmstruct
355 )) timestr[0] = 0;
356 fprintf(moonbr_logfile, "%s%s\n", timestr, msg);
357 }
358 if (moonbr_use_syslog) {
359 /* logging through syslog desired */
360 syslog(priority, "%s", msg);
361 }
362 }
364 /* Formats a message via vsnprintf() and logs it with given syslog() priority */
365 static void moonbr_log(int priority, const char *message, ...) {
366 char msgbuf[MOONBR_LOG_MAXMSGLEN+1]; /* buffer of static size to store formatted message */
367 int msglen; /* length of full message (may exceed MOONBR_LOG_MAXMSGLEN) */
368 {
369 /* pass variable arguments to vsnprintf() to format message */
370 va_list ap;
371 va_start(ap, message);
372 msglen = vsnprintf(msgbuf, MOONBR_LOG_MAXMSGLEN+1, message, ap);
373 va_end(ap);
374 }
375 {
376 /* split and log message line by line */
377 char *line = msgbuf;
378 while (1) {
379 char *endptr = strchr(line, '\n');
380 if (endptr) {
381 /* terminate string where newline character is found */
382 *endptr = 0;
383 } else if (line != msgbuf && msglen > MOONBR_LOG_MAXMSGLEN) {
384 /* break if line is incomplete and not the first line */
385 break;
386 }
387 moonbr_log_msg(priority, line);
388 if (!endptr) break; /* break if end of formatted message is reached */
389 line = endptr+1; /* otherwise continue with remaining message */
390 }
391 }
392 if (msglen > MOONBR_LOG_MAXMSGLEN) {
393 /* print warning if message was truncated */
394 moonbr_log_msg(priority, "Previous log message has been truncated due to excessive length");
395 }
396 }
399 /*** Termination function ***/
401 /* Kill all child processes, remove PID file (if existent), and exit master process with given exitcode */
402 static void moonbr_terminate(int exitcode) {
403 {
404 struct moonbr_pool *pool;
405 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
406 {
407 struct moonbr_worker *worker;
408 for (worker=pool->first_worker; worker; worker=worker->next_worker) {
409 moonbr_log(LOG_INFO, "Sending SIGKILL to child with PID %i", (int)worker->pid);
410 if (kill(worker->pid, SIGKILL)) {
411 moonbr_log(LOG_ERR, "Error while killing child process: %s", strerror(errno));
412 }
413 }
414 }
415 {
416 int i;
417 for (i=0; i<pool->listener_count; i++) {
418 struct moonbr_listener *listener = &pool->listener[i];
419 if (listener->proto == MOONBR_PROTO_LOCAL) {
420 moonbr_log(LOG_INFO, "Unlinking local socket \"%s\"", listener->type_specific.socket.addr.addr_un.sun_path);
421 if (unlink(listener->type_specific.socket.addr.addr_un.sun_path)) {
422 moonbr_log(LOG_ERR, "Error while unlinking local socket: %s", strerror(errno));
423 }
424 }
425 }
426 }
427 }
428 }
429 moonbr_log(exitcode ? LOG_ERR : LOG_NOTICE, "Terminating with exit code %i", exitcode);
430 if (moonbr_pidfh && pidfile_remove(moonbr_pidfh)) {
431 moonbr_log(LOG_ERR, "Error while removing PID file: %s", strerror(errno));
432 }
433 exit(exitcode);
434 }
436 /* Terminate with either MOONBR_EXITCODE_STARTUPERROR or MOONBR_EXITCODE_RUNTIMEERROR */
437 #define moonbr_terminate_error() \
438 moonbr_terminate( \
439 moonbr_pstate == MOONBR_PSTATE_STARTUP ? \
440 MOONBR_EXITCODE_STARTUPERROR : \
441 MOONBR_EXITCODE_RUNTIMEERROR \
442 )
445 /*** Helper functions ***/
447 /* Fills a 'struct timeval' structure with the current time (using CLOCK_MONOTONIC) */
448 static void moonbr_now(struct timeval *now) {
449 struct timespec ts = {0, };
450 if (clock_gettime(CLOCK_MONOTONIC, &ts)) {
451 moonbr_log(LOG_CRIT, "Error in clock_gettime() call: %s", strerror(errno));
452 moonbr_terminate_error();
453 }
454 *now = (struct timeval){ .tv_sec = ts.tv_sec, .tv_usec = ts.tv_nsec / 1000 };
455 }
457 /* Formats a 'struct timeval' value (not thread-safe) */
458 static char *moonbr_format_timeval(struct timeval *t) {
459 static char buf[32];
460 snprintf(buf, 32, "%ji.%06ji seconds", (intmax_t)t->tv_sec, (intmax_t)t->tv_usec);
461 return buf;
462 }
465 /*** Functions for pool creation and startup ***/
467 /* Creates a 'struct moonbr_pool' structure with a given number of listeners */
468 static struct moonbr_pool *moonbr_create_pool(int listener_count) {
469 struct moonbr_pool *pool;
470 pool = calloc(1,
471 sizeof(struct moonbr_pool) + /* size of 'struct moonbr_pool' with one listener */
472 (listener_count-1) * sizeof(struct moonbr_listener) /* size of extra listeners */
473 );
474 if (!pool) {
475 moonbr_log(LOG_CRIT, "Memory allocation error");
476 moonbr_terminate_error();
477 }
478 pool->listener_count = listener_count;
479 {
480 /* initialization of listeners */
481 int i;
482 for (i=0; i<listener_count; i++) {
483 struct moonbr_listener *listener = &pool->listener[i];
484 listener->pool = pool;
485 listener->listenfd = -1;
486 listener->pollidx = -1;
487 }
488 }
489 return pool;
490 }
492 /* Destroys a 'struct moonbr_pool' structure before it has been started */
493 static void moonbr_destroy_pool(struct moonbr_pool *pool) {
494 int i;
495 for (i=0; i<pool->listener_count; i++) {
496 struct moonbr_listener *listener = &pool->listener[i];
497 if (
498 listener->proto == MOONBR_PROTO_INTERVAL &&
499 listener->type_specific.interval.name
500 ) {
501 free(listener->type_specific.interval.name);
502 }
503 }
504 free(pool);
505 }
507 /* Starts a all listeners in a pool */
508 static int moonbr_start_pool(struct moonbr_pool *pool) {
509 moonbr_log(LOG_INFO, "Creating pool", pool->poolnum);
510 {
511 int i;
512 for (i=0; i<pool->listener_count; i++) {
513 struct moonbr_listener *listener = &pool->listener[i];
514 switch (listener->proto) {
515 case MOONBR_PROTO_INTERVAL:
516 if (listener->type_specific.interval.main) {
517 /* nothing to do here: starting main thread is performed in moonbr_run() function */
518 if (!listener->type_specific.interval.name) {
519 moonbr_log(LOG_INFO, "Adding unnamed main thread");
520 } else {
521 moonbr_log(LOG_INFO, "Adding main thread \"%s\"", listener->type_specific.interval.name);
522 }
523 } else {
524 /* nothing to do here: starting intervals is performed in moonbr_run() function */
525 if (!listener->type_specific.interval.name) {
526 moonbr_log(LOG_INFO, "Adding unnamed interval listener");
527 } else {
528 moonbr_log(LOG_INFO, "Adding interval listener \"%s\"", listener->type_specific.interval.name);
529 }
530 }
531 break;
532 case MOONBR_PROTO_LOCAL:
533 moonbr_log(LOG_INFO, "Adding local socket listener for path \"%s\"", listener->type_specific.socket.addr.addr_un.sun_path);
534 listener->listenfd = socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
535 if (listener->listenfd == -1) goto moonbr_start_pool_error;
536 if (!unlink(listener->type_specific.socket.addr.addr_un.sun_path)) {
537 moonbr_log(LOG_WARNING, "Unlinked named socket \"%s\" prior to listening", listener->type_specific.socket.addr.addr_un.sun_path);
538 } else {
539 if (errno != ENOENT) {
540 moonbr_log(LOG_ERR, "Could not unlink named socket \"%s\" prior to listening: %s", listener->type_specific.socket.addr.addr_un.sun_path, strerror(errno));
541 }
542 }
543 if (
544 bind(listener->listenfd, &listener->type_specific.socket.addr.addr_abstract, listener->type_specific.socket.addrlen)
545 ) goto moonbr_start_pool_error;
546 if (listen(listener->listenfd, MOONBR_LISTEN_BACKLOG)) goto moonbr_start_pool_error;
547 break;
548 case MOONBR_PROTO_TCP:
549 moonbr_log(LOG_INFO, "Adding TCP listener on interface \"%s\", port %i", listener->proto_specific.tcp.ip, listener->proto_specific.tcp.port);
550 listener->listenfd = socket(listener->type_specific.socket.addr.addr_abstract.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); /* NOTE: not correctly using PF_* but AF_* constants here */
551 if (listener->listenfd == -1) goto moonbr_start_pool_error;
552 {
553 /* avoid "Address already in use" error when restarting service */
554 static const int reuseval = 1;
555 if (setsockopt(
556 listener->listenfd, SOL_SOCKET, SO_REUSEADDR, &reuseval, sizeof(reuseval)
557 )) goto moonbr_start_pool_error;
558 }
559 {
560 /* default to send TCP RST when process terminates unexpectedly */
561 static const struct linger lingerval = {
562 .l_onoff = 1,
563 .l_linger = 0
564 };
565 if (setsockopt(
566 listener->listenfd, SOL_SOCKET, SO_LINGER, &lingerval, sizeof(lingerval)
567 )) goto moonbr_start_pool_error;
568 }
569 if (
570 bind(listener->listenfd, &listener->type_specific.socket.addr.addr_abstract, listener->type_specific.socket.addrlen)
571 ) goto moonbr_start_pool_error;
572 if (listen(listener->listenfd, MOONBR_LISTEN_BACKLOG)) goto moonbr_start_pool_error;
573 break;
574 default:
575 moonbr_log(LOG_CRIT, "Internal error (should not happen): Unexpected value in listener.proto field");
576 moonbr_terminate_error();
577 }
578 }
579 goto moonbr_start_pool_ok;
580 moonbr_start_pool_error:
581 {
582 int j = i;
583 int errno2 = errno;
584 for (; i>=0; i--) {
585 struct moonbr_listener *listener = &pool->listener[i];
586 if (listener->listenfd != -1) close(listener->listenfd);
587 }
588 errno = errno2;
589 return j;
590 }
591 }
592 moonbr_start_pool_ok:
593 pool->poolnum = ++moonbr_pool_count;
594 moonbr_log(LOG_INFO, "Pool #%i created", pool->poolnum);
595 if (moonbr_last_pool) moonbr_last_pool->next_pool = pool;
596 else moonbr_first_pool = pool;
597 moonbr_last_pool = pool;
598 return -1;
599 }
602 /*** Function to send data and a file descriptor to child process */
604 /* Sends control message of one bye plus optional file descriptor plus optional pointer to child process */
605 static void moonbr_send_control_message(struct moonbr_worker *worker, char status, int fd, void *ptr) {
606 {
607 struct iovec iovector = { .iov_base = &status, .iov_len = 1 }; /* carrying status byte */
608 char control_message_buffer[CMSG_SPACE(sizeof(int))] = {0, }; /* used to transfer file descriptor */
609 struct msghdr message = { .msg_iov = &iovector, .msg_iovlen = 1 }; /* data structure passed to sendmsg() call */
610 if (moonbr_debug) {
611 if (fd == -1) {
612 moonbr_log(LOG_DEBUG, "Sending control message \"%c\" to child process in pool #%i (PID %i)", (int)status, worker->pool->poolnum, (int)worker->pid);
613 } else {
614 moonbr_log(LOG_DEBUG, "Sending control message \"%c\" with file descriptor #%i to child process in pool #%i (PID %i)", (int)status, fd, worker->pool->poolnum, (int)worker->pid);
615 }
616 }
617 if (fd != -1) {
618 /* attach control message with file descriptor */
619 message.msg_control = control_message_buffer;
620 message.msg_controllen = CMSG_SPACE(sizeof(int));
621 {
622 struct cmsghdr *control_message = CMSG_FIRSTHDR(&message);
623 control_message->cmsg_level = SOL_SOCKET;
624 control_message->cmsg_type = SCM_RIGHTS;
625 control_message->cmsg_len = CMSG_LEN(sizeof(int));
626 memcpy(CMSG_DATA(control_message), &fd, sizeof(int));
627 }
628 }
629 while (sendmsg(worker->controlfd, &message, MSG_NOSIGNAL) < 0) {
630 if (errno == EPIPE) {
631 moonbr_log(LOG_ERR, "Error while communicating with idle child process in pool #%i (PID %i): %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
632 return; /* do not close socket; socket is closed when reading from it */
633 }
634 if (errno != EINTR) {
635 moonbr_log(LOG_CRIT, "Unexpected error while communicating with idle child process in pool #%i (PID %i): %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
636 moonbr_terminate_error();
637 }
638 }
639 }
640 if (ptr) {
641 char buf[sizeof(void *)];
642 char *pos = buf;
643 int len = sizeof(void *);
644 ssize_t written;
645 if (moonbr_debug) {
646 moonbr_log(LOG_DEBUG, "Sending memory pointer to child process in pool #%i (PID %i)", (int)status, worker->pool->poolnum, (int)worker->pid);
647 }
648 memcpy(buf, &ptr, sizeof(void *));
649 while (len) {
650 written = send(worker->controlfd, pos, len, MSG_NOSIGNAL);
651 if (written > 0) {
652 pos += written;
653 len -= written;
654 } else if (errno == EPIPE) {
655 moonbr_log(LOG_ERR, "Error while communicating with idle child process in pool #%i (PID %i): %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
656 return; /* do not close socket; socket is closed when reading from it */
657 } else if (errno != EINTR) {
658 moonbr_log(LOG_CRIT, "Unexpected error while communicating with idle child process in pool #%i (PID %i): %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
659 moonbr_terminate_error();
660 }
661 }
662 }
663 }
666 /*** Functions running in child process ***/
668 /* Logs an error in child process */
669 static void moonbr_child_log(const char *message) {
670 fprintf(stderr, "%s\n", message);
671 }
673 /* Logs a fatal error in child process and terminates process with error status */
674 static void moonbr_child_log_fatal(const char *message) {
675 moonbr_child_log(message);
676 exit(1);
677 }
679 /* Logs an error in child process while appending error string for global errno variable */
680 static void moonbr_child_log_errno(const char *message) {
681 char errmsg[MOONBR_MAXSTRERRORLEN] = MOONBR_STRERROR_R_MSG;
682 strerror_r(errno, errmsg, MOONBR_MAXSTRERRORLEN); /* use thread-safe call in case child created threads */
683 fprintf(stderr, "%s: %s\n", message, errmsg);
684 }
686 /* Logs a fatal error in child process while appending error string for errno and terminating process */
687 static void moonbr_child_log_errno_fatal(const char *message) {
688 moonbr_child_log_errno(message);
689 exit(1);
690 }
692 /* Receives a control message consisting of one character plus an optional file descriptor from parent process */
693 static void moonbr_child_receive_control_message(int socketfd, char *status, int *fd) {
694 struct iovec iovector = { .iov_base = status, .iov_len = 1 }; /* reference to status byte variable */
695 char control_message_buffer[CMSG_SPACE(sizeof(int))] = {0, }; /* used to receive file descriptor */
696 struct msghdr message = { /* data structure passed to recvmsg() call */
697 .msg_iov = &iovector,
698 .msg_iovlen = 1,
699 .msg_control = control_message_buffer,
700 .msg_controllen = CMSG_SPACE(sizeof(int))
701 };
702 {
703 int received;
704 while ((received = recvmsg(socketfd, &message, MSG_CMSG_CLOEXEC)) < 0) {
705 if (errno != EINTR) {
706 moonbr_child_log_errno_fatal("Error while trying to receive connection socket from parent process");
707 }
708 }
709 if (!received) {
710 moonbr_child_log_fatal("Unexpected EOF while trying to receive connection socket from parent process");
711 }
712 }
713 {
714 struct cmsghdr *control_message = CMSG_FIRSTHDR(&message);
715 if (control_message) {
716 if (control_message->cmsg_level != SOL_SOCKET) {
717 moonbr_child_log_fatal("Received control message with cmsg_level not equal to SOL_SOCKET");
718 }
719 if (control_message->cmsg_type != SCM_RIGHTS) {
720 moonbr_child_log_fatal("Received control message with cmsg_type not equal to SCM_RIGHTS");
721 }
722 memcpy(fd, CMSG_DATA(control_message), sizeof(int));
723 } else {
724 *fd = -1;
725 }
726 }
727 }
729 /* Receives a pointer from parent process */
730 static void *moonbr_child_receive_pointer(int socketfd) {
731 char buf[sizeof(void *)];
732 char *pos = buf;
733 int len = sizeof(void *);
734 ssize_t bytes_read;
735 while (len) {
736 bytes_read = recv(socketfd, pos, len, 0);
737 if (bytes_read > 0) {
738 pos += bytes_read;
739 len -= bytes_read;
740 } else if (!bytes_read) {
741 moonbr_child_log_fatal("Unexpected EOF while trying to receive memory pointer from parent process");
742 } else if (errno != EINTR) {
743 moonbr_child_log_errno_fatal("Error while trying to receive memory pointer from parent process");
744 }
745 }
746 {
747 void *ptr; /* avoid breaking strict-aliasing rules */
748 memcpy(&ptr, buf, sizeof(void *));
749 return ptr;
750 }
751 }
753 /* Main function of child process to be called after fork() and file descriptor rearrangement */
754 void moonbr_child_run(struct moonbr_pool *pool, lua_State *L) {
755 char controlmsg;
756 int fd;
757 struct itimerval notimer = { { 0, }, { 0, } };
758 lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
759 if (lua_isnil(L, -1)) lua_pop(L, 1);
760 else if (lua_pcall(L, 0, 0, 1)) {
761 fprintf(stderr, "Error in \"prepare\" function: %s\n", lua_tostring(L, -1));
762 exit(1);
763 }
764 while (1) {
765 struct moonbr_listener *listener;
766 if (setitimer(ITIMER_REAL, ¬imer, NULL)) {
767 moonbr_child_log_errno_fatal("Could not reset ITIMER_REAL via setitimer()");
768 }
769 controlmsg = MOONBR_STATUS_IDLE;
770 if (write(MOONBR_FD_CONTROL, &controlmsg, 1) <= 0) {
771 moonbr_child_log_errno_fatal("Error while sending ready message to parent process");
772 }
773 moonbr_child_receive_control_message(MOONBR_FD_CONTROL, &controlmsg, &fd);
774 if (!(
775 (controlmsg == MOONBR_COMMAND_TERMINATE && fd == -1) ||
776 (controlmsg == MOONBR_COMMAND_CONNECT)
777 )) {
778 moonbr_child_log_fatal("Received illegal control message from parent process");
779 }
780 if (controlmsg == MOONBR_COMMAND_TERMINATE) break;
781 listener = moonbr_child_receive_pointer(MOONBR_FD_CONTROL);
782 if (
783 listener->proto != MOONBR_PROTO_LOCAL &&
784 listener->proto != MOONBR_PROTO_TCP &&
785 fd >= 0
786 ) {
787 moonbr_child_log_fatal("Received unexpected file descriptor from parent process");
788 } else if (
789 listener->proto != MOONBR_PROTO_INTERVAL && fd < 0
790 ) {
791 moonbr_child_log_fatal("Missing file descriptor from parent process");
792 }
793 if (fd >= 0) moonbr_io_pushhandle(L, fd);
794 lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
795 if (fd < 0) {
796 lua_newtable(L);
797 if (listener->proto == MOONBR_PROTO_INTERVAL) {
798 lua_pushstring(L,
799 listener->type_specific.interval.name ?
800 listener->type_specific.interval.name : ""
801 );
802 if (listener->type_specific.interval.main) {
803 lua_setfield(L, -2, "main");
804 } else {
805 lua_setfield(L, -2, "interval");
806 }
807 }
808 } else {
809 lua_pushvalue(L, -2);
810 }
811 if (lua_pcall(L, 1, 1, 1)) {
812 fprintf(stderr, "Error in \"connect\" function: %s\n", lua_tostring(L, -1));
813 exit(1);
814 }
815 if (fd >= 0) moonbr_io_closehandle(L, -2, 0); /* attemt clean close */
816 if (lua_type(L, -1) != LUA_TBOOLEAN || !lua_toboolean(L, -1)) break;
817 #ifdef MOONBR_LUA_PANIC_BUG_WORKAROUND
818 lua_settop(L, 2);
819 #else
820 lua_settop(L, 1);
821 #endif
822 }
823 controlmsg = MOONBR_STATUS_GOODBYE;
824 if (write(MOONBR_FD_CONTROL, &controlmsg, 1) <= 0) {
825 moonbr_child_log_errno_fatal("Error while sending goodbye message to parent process");
826 }
827 if (close(MOONBR_FD_CONTROL) && errno != EINTR) {
828 moonbr_child_log_errno("Error while closing control socket");
829 }
830 lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
831 if (lua_isnil(L, -1)) lua_pop(L, 1);
832 else if (lua_pcall(L, 0, 0, 1)) {
833 fprintf(stderr, "Error in \"finish\" function: %s\n", lua_tostring(L, -1));
834 exit(1);
835 }
836 lua_close(L);
837 exit(0);
838 }
841 /*** Functions to spawn child process ***/
843 /* Helper function to send an error message to a file descriptor (not needing a file stream) */
844 static void moonbr_child_emergency_print(int fd, char *message) {
845 size_t len = strlen(message);
846 ssize_t written;
847 while (len) {
848 written = write(fd, message, len);
849 if (written > 0) {
850 message += written;
851 len -= written;
852 } else {
853 if (written != -1 || errno != EINTR) break;
854 }
855 }
856 }
858 /* Helper function to send an error message plus a text for errno to a file descriptor and terminate the process */
859 static void moonbr_child_emergency_error(int fd, char *message) {
860 int errno2 = errno;
861 moonbr_child_emergency_print(fd, message);
862 moonbr_child_emergency_print(fd, ": ");
863 moonbr_child_emergency_print(fd, strerror(errno2));
864 moonbr_child_emergency_print(fd, "\n");
865 exit(1);
866 }
868 /* Creates a child process and (in case of success) registers it in the 'struct moonbr_pool' structure */
869 static int moonbr_create_worker(struct moonbr_pool *pool, lua_State *L) {
870 struct moonbr_worker *worker;
871 worker = calloc(1, sizeof(struct moonbr_worker));
872 if (!worker) {
873 moonbr_log(LOG_CRIT, "Memory allocation error");
874 return -1;
875 }
876 worker->pool = pool;
877 {
878 int controlfds[2];
879 int errorfds[2];
880 if (socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, controlfds)) {
881 moonbr_log(LOG_ERR, "Could not create control socket pair for communcation with child process: %s", strerror(errno));
882 free(worker);
883 return -1;
884 }
885 if (socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, errorfds)) {
886 moonbr_log(LOG_ERR, "Could not create socket pair to redirect stderr of child process: %s", strerror(errno));
887 close(controlfds[0]);
888 close(controlfds[1]);
889 free(worker);
890 return -1;
891 }
892 if (moonbr_logfile && fflush(moonbr_logfile)) {
893 moonbr_log(LOG_CRIT, "Could not flush log file prior to forking: %s", strerror(errno));
894 moonbr_terminate_error();
895 }
896 worker->pid = fork();
897 if (worker->pid == -1) {
898 moonbr_log(LOG_ERR, "Could not fork: %s", strerror(errno));
899 close(controlfds[0]);
900 close(controlfds[1]);
901 close(errorfds[0]);
902 close(errorfds[1]);
903 free(worker);
904 return -1;
905 } else if (!worker->pid) {
906 moonbr_pstate = MOONBR_PSTATE_FORKED;
907 #ifdef MOONBR_LUA_PANIC_BUG_WORKAROUND
908 lua_pushliteral(L, "Failed to pass error message due to bug in Lua panic handler (hint: not enough memory?)");
909 #endif
910 moonbr_memory_limit = pool->memory_limit;
911 if (moonbr_pidfh && pidfile_close(moonbr_pidfh)) {
912 moonbr_child_emergency_error(errorfds[1], "Could not close PID file in forked child process");
913 }
914 if (moonbr_logfile && moonbr_logfile != stderr && fclose(moonbr_logfile)) {
915 moonbr_child_emergency_error(errorfds[1], "Could not close log file in forked child process");
916 }
917 if (dup2(errorfds[1], MOONBR_FD_STDERR) == -1) {
918 moonbr_child_emergency_error(errorfds[1], "Could not duplicate socket to stderr file descriptor");
919 }
920 if (dup2(controlfds[1], MOONBR_FD_CONTROL) == -1) {
921 moonbr_child_emergency_error(errorfds[1], "Could not duplicate control socket");
922 }
923 closefrom(MOONBR_FD_END);
924 moonbr_child_run(pool, L);
925 }
926 if (moonbr_stat) {
927 moonbr_log(LOG_INFO, "Created new worker in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
928 }
929 worker->controlfd = controlfds[0];
930 worker->errorfd = errorfds[0];
931 if (close(controlfds[1]) && errno != EINTR) {
932 moonbr_log(LOG_CRIT, "Could not close opposite end of control file descriptor after forking");
933 moonbr_terminate_error();
934 }
935 if (close(errorfds[1]) && errno != EINTR) {
936 moonbr_log(LOG_CRIT, "Could not close opposite end of control file descriptor after forking");
937 moonbr_terminate_error();
938 }
939 }
940 worker->prev_worker = pool->last_worker;
941 if (worker->prev_worker) worker->prev_worker->next_worker = worker;
942 else pool->first_worker = worker;
943 pool->last_worker = worker;
944 pool->unassigned_worker_count++;
945 pool->total_worker_count++;
946 pool->worker_count_stat = 1;
947 moonbr_poll_refresh_needed = 1;
948 return 0; /* return zero only in case of success */
949 }
952 /*** Functions for queues of 'struct moonbr_listener' ***/
954 /* Appends a 'struct moonbr_listener' to the queue of idle listeners and registers it for poll() */
955 static void moonbr_add_idle_listener(struct moonbr_listener *listener) {
956 listener->prev_listener = listener->pool->last_idle_listener;
957 if (listener->prev_listener) listener->prev_listener->next_listener = listener;
958 else listener->pool->first_idle_listener = listener;
959 listener->pool->last_idle_listener = listener;
960 if (listener->pollidx != -1) moonbr_poll_fds[listener->pollidx].events |= POLLIN;
961 }
963 /* Removes a 'struct moonbr_listener' from the queue of idle listeners and unregisters it from poll() */
964 static void moonbr_remove_idle_listener(struct moonbr_listener *listener) {
965 if (listener->prev_listener) listener->prev_listener->next_listener = listener->next_listener;
966 else listener->pool->first_idle_listener = listener->next_listener;
967 if (listener->next_listener) listener->next_listener->prev_listener = listener->prev_listener;
968 else listener->pool->last_idle_listener = listener->prev_listener;
969 listener->prev_listener = NULL;
970 listener->next_listener = NULL;
971 if (listener->pollidx != -1) moonbr_poll_fds[listener->pollidx].events &= ~POLLIN;
972 }
974 /* Adds a listener to the queue of connected listeners (i.e. waiting to have their incoming connection accepted) */
975 static void moonbr_add_connected_listener(struct moonbr_listener *listener) {
976 listener->prev_listener = listener->pool->last_connected_listener;
977 if (listener->prev_listener) listener->prev_listener->next_listener = listener;
978 else listener->pool->first_connected_listener = listener;
979 listener->pool->last_connected_listener = listener;
980 }
982 /* Removes and returns the first connected listener in the queue */
983 static struct moonbr_listener *moonbr_pop_connected_listener(struct moonbr_pool *pool) {
984 struct moonbr_listener *listener = pool->first_connected_listener;
985 listener->pool->first_connected_listener = listener->next_listener;
986 if (listener->pool->first_connected_listener) listener->pool->first_connected_listener->prev_listener = NULL;
987 else listener->pool->last_connected_listener = NULL;
988 listener->next_listener = NULL;
989 return listener;
990 }
993 /*** Functions to handle polling ***/
995 /* Returns an index to a new initialized entry in moonbr_poll_fds[] */
996 int moonbr_poll_fds_nextindex() {
997 if (moonbr_poll_fds_count >= moonbr_poll_fds_bufsize) {
998 if (moonbr_poll_fds_bufsize) moonbr_poll_fds_bufsize *= 2;
999 else moonbr_poll_fds_bufsize = 1;
1000 moonbr_poll_fds = realloc(
1001 moonbr_poll_fds, moonbr_poll_fds_bufsize * sizeof(struct pollfd)
1002 );
1003 if (!moonbr_poll_fds) {
1004 moonbr_log(LOG_CRIT, "Memory allocation error");
1005 moonbr_terminate_error();
1006 }
1007 }
1008 moonbr_poll_fds[moonbr_poll_fds_count] = (struct pollfd){0, };
1009 return moonbr_poll_fds_count++;
1010 }
1012 /* Returns an index to a new initialized entry in moonbr_poll_workers[] */
1013 int moonbr_poll_workers_nextindex() {
1014 if (moonbr_poll_worker_count >= moonbr_poll_workers_bufsize) {
1015 if (moonbr_poll_workers_bufsize) moonbr_poll_workers_bufsize *= 2;
1016 else moonbr_poll_workers_bufsize = 1;
1017 moonbr_poll_workers = realloc(
1018 moonbr_poll_workers, moonbr_poll_workers_bufsize * sizeof(struct moonbr_poll_worker)
1019 );
1020 if (!moonbr_poll_workers) {
1021 moonbr_log(LOG_CRIT, "Memory allocation error");
1022 moonbr_terminate_error();
1023 }
1024 }
1025 moonbr_poll_workers[moonbr_poll_worker_count] = (struct moonbr_poll_worker){0, };
1026 return moonbr_poll_worker_count++;
1027 }
1029 /* Queues all listeners as idle, and initializes static part of moonbr_poll_fds[], which is passed to poll() */
1030 static void moonbr_poll_init() {
1031 if (socketpair(
1032 PF_LOCAL,
1033 SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
1034 0,
1035 moonbr_poll_signalfds
1036 )) {
1037 moonbr_log(LOG_CRIT, "Could not create socket pair for signal delivery during polling: %s", strerror(errno));
1038 moonbr_terminate_error();
1039 }
1040 {
1041 int j = moonbr_poll_fds_nextindex();
1042 struct pollfd *pollfd = &moonbr_poll_fds[j];
1043 pollfd->fd = moonbr_poll_signalfd_read;
1044 pollfd->events = POLLIN;
1045 }
1046 {
1047 struct moonbr_pool *pool;
1048 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1049 int i;
1050 for (i=0; i<pool->listener_count; i++) {
1051 struct moonbr_listener *listener = &pool->listener[i];
1052 if (listener->listenfd != -1) {
1053 int j = moonbr_poll_fds_nextindex();
1054 listener->pollidx = j;
1055 moonbr_poll_fds[j].fd = listener->listenfd;
1056 }
1057 moonbr_add_idle_listener(listener);
1058 }
1059 }
1060 }
1061 moonbr_poll_fds_static_count = moonbr_poll_fds_count; /* remember size of static part of array */
1062 }
1064 /* Disables polling of all listeners (required for clean shutdown) */
1065 static void moonbr_poll_shutdown() {
1066 int i;
1067 for (i=1; i<moonbr_poll_fds_static_count; i++) {
1068 moonbr_poll_fds[i].fd = -1;
1069 }
1070 }
1072 /* (Re)builds dynamic part of moonbr_poll_fds[] array, and (re)builds moonbr_poll_workers[] array */
1073 static void moonbr_poll_refresh() {
1074 moonbr_poll_refresh_needed = 0;
1075 moonbr_poll_fds_count = moonbr_poll_fds_static_count;
1076 moonbr_poll_worker_count = 0;
1077 {
1078 struct moonbr_pool *pool;
1079 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1080 struct moonbr_worker *worker;
1081 for (worker=pool->first_worker; worker; worker=worker->next_worker) {
1082 if (worker->controlfd != -1) {
1083 int j = moonbr_poll_fds_nextindex();
1084 int k = moonbr_poll_workers_nextindex();
1085 struct pollfd *pollfd = &moonbr_poll_fds[j];
1086 struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[k];
1087 pollfd->fd = worker->controlfd;
1088 pollfd->events = POLLIN;
1089 poll_worker->channel = MOONBR_POLL_WORKER_CONTROLCHANNEL;
1090 poll_worker->worker = worker;
1091 }
1092 if (worker->errorfd != -1) {
1093 int j = moonbr_poll_fds_nextindex();
1094 int k = moonbr_poll_workers_nextindex();
1095 struct pollfd *pollfd = &moonbr_poll_fds[j];
1096 struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[k];
1097 pollfd->fd = worker->errorfd;
1098 pollfd->events = POLLIN;
1099 poll_worker->channel = MOONBR_POLL_WORKER_ERRORCHANNEL;
1100 poll_worker->worker = worker;
1101 }
1102 }
1103 }
1104 }
1105 }
1107 /* resets socket and 'revents' field of moonbr_poll_fds[] for signal delivery just before poll() is called */
1108 static void moonbr_poll_reset_signal() {
1109 ssize_t readcount;
1110 char buf[1];
1111 moonbr_poll_fds[0].revents = 0;
1112 while ((readcount = read(moonbr_poll_signalfd_read, buf, 1)) < 0) {
1113 if (errno == EAGAIN) break;
1114 if (errno != EINTR) {
1115 moonbr_log(LOG_CRIT, "Error while reading from signal delivery socket: %s", strerror(errno));
1116 moonbr_terminate_error();
1117 }
1118 }
1119 if (!readcount) {
1120 moonbr_log(LOG_CRIT, "Unexpected EOF when reading from signal delivery socket: %s", strerror(errno));
1121 moonbr_terminate_error();
1122 }
1123 }
1126 /*** Shutdown initiation ***/
1128 /* Sets global variable 'moonbr_shutdown_in_progress', closes listeners, and demands worker termination */
1129 static void moonbr_initiate_shutdown() {
1130 struct moonbr_pool *pool;
1131 int i;
1132 static int ignore_once = 0;
1133 if (ignore_once) {
1134 ignore_once = 0;
1135 return;
1136 }
1137 if (moonbr_shutdown_in_progress) {
1138 moonbr_log(LOG_NOTICE, "Shutdown already in progress");
1139 return;
1140 }
1141 moonbr_shutdown_in_progress = 1;
1142 moonbr_log(LOG_NOTICE, "Initiate shutdown");
1143 for (pool = moonbr_first_pool; pool; pool = pool->next_pool) {
1144 for (i=0; i<pool->listener_count; i++) {
1145 struct moonbr_listener *listener = &pool->listener[i];
1146 if (listener->listenfd != -1) {
1147 if (close(listener->listenfd) && errno != EINTR) {
1148 moonbr_log(LOG_CRIT, "Could not close listening socket: %s", strerror(errno));
1149 moonbr_terminate_error();
1150 }
1151 }
1152 }
1153 }
1154 moonbr_poll_shutdown(); /* avoids loops due to error condition when polling closed listeners */
1155 {
1156 pid_t pgrp = getpgrp();
1157 moonbr_log(LOG_INFO, "Sending SIGTERM to all processes in group %i", (int)pgrp);
1158 if (killpg(pgrp, SIGTERM)) {
1159 moonbr_log(LOG_WARNING, "Error while sending SIGTERM to own process group: %s", strerror(errno));
1160 }
1161 ignore_once = 1;
1162 }
1163 }
1166 /*** Functions to handle previously created 'struct moonbr_worker' structures ***/
1168 #define moonbr_try_destroy_worker_stat(str, field) \
1169 moonbr_log(LOG_INFO, "Resource usage in pool #%i for PID %i: " str " %li", worker->pool->poolnum, (int)worker->pid, (long)childusage.field);
1171 /* Destroys a worker structure if socket connections have been closed and child process has terminated */
1172 static int moonbr_try_destroy_worker(struct moonbr_worker *worker) {
1173 if (worker->controlfd != -1 || worker->errorfd != -1) return MOONBR_DESTROY_NONE;
1174 {
1175 int childstatus;
1176 struct rusage childusage;
1177 {
1178 pid_t waitedpid;
1179 while (
1180 (waitedpid = wait4(worker->pid, &childstatus, WNOHANG, &childusage)) == -1
1181 ) {
1182 if (errno != EINTR) {
1183 moonbr_log(LOG_CRIT, "Error in wait4() call: %s", strerror(errno));
1184 moonbr_terminate_error();
1185 }
1186 }
1187 if (!waitedpid) return 0; /* return 0 if worker couldn't be destroyed */
1188 if (waitedpid != worker->pid) {
1189 moonbr_log(LOG_CRIT, "Wrong PID returned by wait4() call");
1190 moonbr_terminate_error();
1191 }
1192 }
1193 if (WIFEXITED(childstatus)) {
1194 if (WEXITSTATUS(childstatus) || moonbr_stat) {
1195 moonbr_log(
1196 WEXITSTATUS(childstatus) ? LOG_WARNING : LOG_INFO,
1197 "Child process in pool #%i with PID %i returned with exit code %i", worker->pool->poolnum, (int)worker->pid, WEXITSTATUS(childstatus)
1198 );
1199 }
1200 } else if (WIFSIGNALED(childstatus)) {
1201 if (WCOREDUMP(childstatus)) {
1202 moonbr_log(LOG_ERR, "Child process in pool #%i with PID %i died from signal %i (core dump was created)", worker->pool->poolnum, (int)worker->pid, WTERMSIG(childstatus));
1203 } else if (WTERMSIG(childstatus) == SIGALRM) {
1204 moonbr_log(LOG_WARNING, "Child process in pool #%i with PID %i exited prematurely due to timeout", worker->pool->poolnum, (int)worker->pid);
1205 } else {
1206 moonbr_log(LOG_ERR, "Child process in pool #%i with PID %i died from signal %i", worker->pool->poolnum, (int)worker->pid, WTERMSIG(childstatus));
1207 }
1208 } else {
1209 moonbr_log(LOG_CRIT, "Illegal exit status from child process in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
1210 moonbr_terminate_error();
1211 }
1212 if (moonbr_stat) {
1213 moonbr_log(LOG_INFO, "Resource usage in pool #%i for PID %i: user time %s", worker->pool->poolnum, (int)worker->pid, moonbr_format_timeval(&childusage.ru_utime));
1214 moonbr_log(LOG_INFO, "Resource usage in pool #%i for PID %i: system time %s", worker->pool->poolnum, (int)worker->pid, moonbr_format_timeval(&childusage.ru_stime));
1215 moonbr_try_destroy_worker_stat("max resident set size", ru_maxrss);
1216 moonbr_try_destroy_worker_stat("integral shared memory size", ru_ixrss);
1217 moonbr_try_destroy_worker_stat("integral unshared data", ru_idrss);
1218 moonbr_try_destroy_worker_stat("integral unshared stack", ru_isrss);
1219 moonbr_try_destroy_worker_stat("page replaims", ru_minflt);
1220 moonbr_try_destroy_worker_stat("page faults", ru_majflt);
1221 moonbr_try_destroy_worker_stat("swaps", ru_nswap);
1222 moonbr_try_destroy_worker_stat("block input operations", ru_inblock);
1223 moonbr_try_destroy_worker_stat("block output operations", ru_oublock);
1224 moonbr_try_destroy_worker_stat("messages sent", ru_msgsnd);
1225 moonbr_try_destroy_worker_stat("messages received", ru_msgrcv);
1226 moonbr_try_destroy_worker_stat("signals received", ru_nsignals);
1227 moonbr_try_destroy_worker_stat("voluntary context switches", ru_nvcsw);
1228 moonbr_try_destroy_worker_stat("involuntary context switches", ru_nivcsw);
1229 }
1230 }
1231 {
1232 int retval = (
1233 (worker->idle || worker->assigned) ?
1234 MOONBR_DESTROY_IDLE_OR_ASSIGNED :
1235 MOONBR_DESTROY_PREPARE
1236 );
1237 if (worker->main) moonbr_initiate_shutdown();
1238 if (worker->prev_worker) worker->prev_worker->next_worker = worker->next_worker;
1239 else worker->pool->first_worker = worker->next_worker;
1240 if (worker->next_worker) worker->next_worker->prev_worker = worker->prev_worker;
1241 else worker->pool->last_worker = worker->prev_worker;
1242 if (worker->idle) {
1243 if (worker->prev_idle_worker) worker->prev_idle_worker->next_idle_worker = worker->next_idle_worker;
1244 else worker->pool->first_idle_worker = worker->next_idle_worker;
1245 if (worker->next_idle_worker) worker->next_idle_worker->prev_idle_worker = worker->prev_idle_worker;
1246 else worker->pool->last_idle_worker = worker->prev_idle_worker;
1247 worker->pool->idle_worker_count--;
1248 }
1249 if (!worker->assigned) worker->pool->unassigned_worker_count--;
1250 worker->pool->total_worker_count--;
1251 worker->pool->worker_count_stat = 1;
1252 if (worker->errorlinebuf) free(worker->errorlinebuf);
1253 free(worker);
1254 return retval;
1255 }
1256 }
1258 /* Marks a worker as idle and stores it in a queue, optionally setting 'idle_expiration' value */
1259 static void moonbr_add_idle_worker(struct moonbr_worker *worker) {
1260 worker->prev_idle_worker = worker->pool->last_idle_worker;
1261 if (worker->prev_idle_worker) worker->prev_idle_worker->next_idle_worker = worker;
1262 else worker->pool->first_idle_worker = worker;
1263 worker->pool->last_idle_worker = worker;
1264 worker->idle = 1;
1265 worker->pool->idle_worker_count++;
1266 if (worker->assigned) {
1267 worker->assigned = 0;
1268 worker->pool->unassigned_worker_count++;
1269 }
1270 worker->pool->worker_count_stat = 1;
1271 if (timerisset(&worker->pool->idle_timeout)) {
1272 struct timeval now;
1273 moonbr_now(&now);
1274 timeradd(&now, &worker->pool->idle_timeout, &worker->idle_expiration);
1275 }
1276 }
1278 /* Pops a worker from the queue of idle workers (idle queue must not be empty) */
1279 static struct moonbr_worker *moonbr_pop_idle_worker(struct moonbr_pool *pool) {
1280 struct moonbr_worker *worker;
1281 worker = pool->first_idle_worker;
1282 pool->first_idle_worker = worker->next_idle_worker;
1283 if (pool->first_idle_worker) pool->first_idle_worker->prev_idle_worker = NULL;
1284 else pool->last_idle_worker = NULL;
1285 worker->next_idle_worker = NULL;
1286 worker->idle = 0;
1287 worker->pool->idle_worker_count--;
1288 worker->assigned = 1;
1289 worker->pool->unassigned_worker_count--;
1290 worker->pool->worker_count_stat = 1;
1291 return worker;
1292 }
1295 /*** Functions to communicate with child processes ***/
1297 /* Tells child process to terminate */
1298 static void moonbr_terminate_idle_worker(struct moonbr_worker *worker) {
1299 moonbr_send_control_message(worker, MOONBR_COMMAND_TERMINATE, -1, NULL);
1300 }
1302 /* Handles status messages from child process */
1303 static void moonbr_read_controlchannel(struct moonbr_worker *worker) {
1304 char controlmsg;
1305 {
1306 ssize_t bytes_read;
1307 while ((bytes_read = read(worker->controlfd, &controlmsg, 1)) <= 0) {
1308 if (bytes_read == 0 || errno == ECONNRESET) {
1309 moonbr_log(LOG_WARNING, "Child process in pool #%i with PID %i unexpectedly closed control socket", worker->pool->poolnum, (int)worker->pid);
1310 if (close(worker->controlfd) && errno != EINTR) {
1311 moonbr_log(LOG_CRIT, "Error while closing control socket to child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
1312 moonbr_terminate_error();
1313 }
1314 worker->controlfd = -1;
1315 moonbr_poll_refresh_needed = 1;
1316 return;
1317 }
1318 if (errno != EINTR) {
1319 moonbr_log(LOG_CRIT, "Unexpected error while reading control socket from child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
1320 moonbr_terminate_error();
1321 }
1322 }
1323 }
1324 if (worker->idle) {
1325 moonbr_log(LOG_CRIT, "Unexpected data from supposedly idle child process in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
1326 moonbr_terminate_error();
1327 }
1328 if (moonbr_debug) {
1329 moonbr_log(LOG_DEBUG, "Received control message from child in pool #%i with PID %i: \"%c\"", worker->pool->poolnum, (int)worker->pid, (int)controlmsg);
1330 }
1331 switch (controlmsg) {
1332 case MOONBR_STATUS_IDLE:
1333 if (moonbr_stat) {
1334 moonbr_log(LOG_INFO, "Child process in pool #%i with PID %i reports as idle", worker->pool->poolnum, (int)worker->pid);
1335 }
1336 moonbr_add_idle_worker(worker);
1337 break;
1338 case MOONBR_STATUS_GOODBYE:
1339 if (moonbr_stat) {
1340 moonbr_log(LOG_INFO, "Child process in pool #%i with PID %i announced termination", worker->pool->poolnum, (int)worker->pid);
1341 }
1342 if (close(worker->controlfd) && errno != EINTR) {
1343 moonbr_log(LOG_CRIT, "Error while closing control socket to child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
1344 moonbr_terminate_error();
1345 }
1346 worker->controlfd = -1;
1347 moonbr_poll_refresh_needed = 1;
1348 break;
1349 default:
1350 moonbr_log(LOG_CRIT, "Received illegal data (\"%c\") while reading control socket from child process in pool #%i with PID %i", (int)controlmsg, worker->pool->poolnum, (int)worker->pid);
1351 moonbr_terminate_error();
1352 }
1353 }
1355 /* Handles stderr stream from child process */
1356 static void moonbr_read_errorchannel(struct moonbr_worker *worker) {
1357 char staticbuf[MOONBR_MAXERRORLINELEN+1];
1358 char *buf = worker->errorlinebuf;
1359 if (!buf) buf = staticbuf;
1360 {
1361 ssize_t bytes_read;
1362 while (
1363 (bytes_read = read(
1364 worker->errorfd,
1365 buf + worker->errorlinelen,
1366 MOONBR_MAXERRORLINELEN+1 - worker->errorlinelen
1367 )) <= 0
1368 ) {
1369 if (bytes_read == 0 || errno == ECONNRESET) {
1370 if (moonbr_debug) {
1371 moonbr_log(LOG_DEBUG, "Child process in pool #%i with PID %i closed stderr socket", worker->pool->poolnum, (int)worker->pid);
1372 }
1373 if (close(worker->errorfd) && errno != EINTR) {
1374 moonbr_log(LOG_CRIT, "Error while closing stderr socket to child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
1375 moonbr_terminate_error();
1376 }
1377 worker->errorfd = -1;
1378 moonbr_poll_refresh_needed = 1;
1379 break;
1380 }
1381 if (errno != EINTR) {
1382 moonbr_log(LOG_CRIT, "Unexpected error while reading stderr from child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
1383 moonbr_terminate_error();
1384 }
1385 }
1386 worker->errorlinelen += bytes_read;
1387 }
1388 {
1389 int i;
1390 for (i=0; i<worker->errorlinelen; i++) {
1391 if (buf[i] == '\n') buf[i] = 0;
1392 if (!buf[i]) {
1393 if (worker->errorlineovf) {
1394 worker->errorlineovf = 0;
1395 } else {
1396 moonbr_log(LOG_WARNING, "Error log from process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, buf);
1397 }
1398 worker->errorlinelen -= i+1;
1399 memmove(buf, buf+i+1, worker->errorlinelen);
1400 i = -1;
1401 }
1402 }
1403 if (i > MOONBR_MAXERRORLINELEN) {
1404 buf[MOONBR_MAXERRORLINELEN] = 0;
1405 if (!worker->errorlineovf) {
1406 moonbr_log(LOG_WARNING, "Error log from process in pool #%i with PID %i (line has been truncated): %s", worker->pool->poolnum, (int)worker->pid, buf);
1407 }
1408 worker->errorlinelen = 0;
1409 worker->errorlineovf = 1;
1410 }
1411 }
1412 if (!worker->errorlinebuf && worker->errorlinelen) { /* allocate buffer on heap only if necessary */
1413 worker->errorlinebuf = malloc((MOONBR_MAXERRORLINELEN+1) * sizeof(char));
1414 if (!worker->errorlinebuf) {
1415 moonbr_log(LOG_CRIT, "Memory allocation error");
1416 moonbr_terminate_error();
1417 }
1418 memcpy(worker->errorlinebuf, staticbuf, worker->errorlinelen);
1419 }
1420 }
1423 /*** Handler for incoming connections ***/
1425 /* Accepts one or more incoming connections on listener socket and passes it to worker(s) popped from idle queue */
1426 static void moonbr_connect(struct moonbr_pool *pool) {
1427 struct moonbr_listener *listener = moonbr_pop_connected_listener(pool);
1428 struct moonbr_worker *worker;
1429 if (listener->proto == MOONBR_PROTO_INTERVAL) {
1430 worker = moonbr_pop_idle_worker(pool);
1431 if (listener->type_specific.interval.main) {
1432 if (moonbr_stat) {
1433 moonbr_log(LOG_INFO, "Dispatching main thread \"%s\" of pool #%i to PID %i", listener->type_specific.interval.name, listener->pool->poolnum, (int)worker->pid);
1434 }
1435 worker->main = 1;
1436 } else {
1437 if (moonbr_stat) {
1438 moonbr_log(LOG_INFO, "Dispatching interval timer \"%s\" of pool #%i to PID %i", listener->type_specific.interval.name, listener->pool->poolnum, (int)worker->pid);
1439 }
1440 worker->restart_interval_listener = listener;
1441 }
1442 moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, -1, listener);
1443 /* do not push listener to queue of idle listeners (yet) */
1444 } else {
1445 int peerfd;
1446 do {
1447 #if defined(__linux__) && !defined(_GNU_SOURCE)
1448 peerfd = accept(listener->listenfd, NULL, NULL);
1449 if (peerfd != -1) {
1450 if (fcntl(peerfd, F_SETFD, FD_CLOEXEC) == -1) {
1451 moonbr_log(LOG_ERR, "Error in fcntl() call: %s", strerror(errno));
1452 moonbr_terminate_error();
1453 }
1454 }
1455 #else
1456 peerfd = accept4(listener->listenfd, NULL, NULL, SOCK_CLOEXEC);
1457 #endif
1458 if (peerfd == -1) {
1459 if (errno == EWOULDBLOCK) {
1460 break;
1461 } else if (errno == ECONNABORTED) {
1462 moonbr_log(LOG_WARNING, "Connection aborted before accepting it");
1463 break;
1464 } else if (errno != EINTR) {
1465 moonbr_log(LOG_ERR, "Could not accept socket connection: %s", strerror(errno));
1466 moonbr_terminate_error();
1467 }
1468 } else {
1469 worker = moonbr_pop_idle_worker(pool);
1470 if (moonbr_stat) {
1471 moonbr_log(LOG_INFO, "Dispatching connection for pool #%i to PID %i", listener->pool->poolnum, (int)worker->pid);
1472 }
1473 moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, peerfd, listener);
1474 if (close(peerfd) && errno != EINTR) {
1475 moonbr_log(LOG_ERR, "Could not close incoming socket connection in parent process: %s", strerror(errno));
1476 moonbr_terminate_error();
1477 }
1478 }
1479 } while (pool->first_idle_worker);
1480 moonbr_add_idle_listener(listener);
1481 }
1482 }
1485 /*** Functions to initialize and restart interval timers ***/
1487 /* Initializes all interval timers */
1488 static void moonbr_interval_initialize() {
1489 struct timeval now;
1490 struct moonbr_pool *pool;
1491 moonbr_now(&now);
1492 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1493 int i;
1494 for (i=0; i<pool->listener_count; i++) {
1495 struct moonbr_listener *listener = &pool->listener[i];
1496 if (listener->proto == MOONBR_PROTO_INTERVAL) {
1497 timeradd(
1498 &now,
1499 &listener->type_specific.interval.delay,
1500 &listener->type_specific.interval.wakeup
1501 );
1502 }
1503 }
1504 }
1505 }
1507 /* If necessary, restarts interval timers and queues interval listener as idle after a worker changed status */
1508 static void moonbr_interval_restart(
1509 struct moonbr_worker *worker,
1510 struct timeval *now /* passed to synchronize with moonbr_run() function */
1511 ) {
1512 struct moonbr_listener *listener = worker->restart_interval_listener;
1513 if (listener) {
1514 moonbr_add_idle_listener(listener);
1515 worker->restart_interval_listener = NULL;
1516 if (listener->type_specific.interval.strict) {
1517 timeradd(
1518 &listener->type_specific.interval.wakeup,
1519 &listener->type_specific.interval.delay,
1520 &listener->type_specific.interval.wakeup
1521 );
1522 if (timercmp(&listener->type_specific.interval.wakeup, now, <)) {
1523 listener->type_specific.interval.wakeup = *now;
1524 }
1525 } else {
1526 timeradd(
1527 now,
1528 &listener->type_specific.interval.delay,
1529 &listener->type_specific.interval.wakeup
1530 );
1531 }
1532 }
1533 }
1536 /*** Main loop and helper functions ***/
1538 /* Stores the earliest required wakeup time in 'wait' variable */
1539 static void moonbr_calc_wait(struct timeval *wait, struct timeval *wakeup) {
1540 if (!timerisset(wait) || timercmp(wakeup, wait, <)) *wait = *wakeup;
1541 }
1543 /* Main loop of Moonbridge system (including initialization of signal handlers and polling structures) */
1544 static void moonbr_run(lua_State *L) {
1545 struct timeval now;
1546 struct moonbr_pool *pool;
1547 struct moonbr_worker *worker;
1548 struct moonbr_worker *next_worker; /* needed when worker is removed during iteration of workers */
1549 struct moonbr_listener *listener;
1550 struct moonbr_listener *next_listener; /* needed when listener is removed during iteration of listeners */
1551 int i;
1552 moonbr_poll_init(); /* must be executed before moonbr_signal_init() */
1553 moonbr_signal_init();
1554 moonbr_interval_initialize();
1555 moonbr_pstate = MOONBR_PSTATE_RUNNING;
1556 while (1) {
1557 struct timeval wait = {0, }; /* point in time when premature wakeup of poll() is required */
1558 if (moonbr_cond_interrupt) {
1559 moonbr_log(LOG_WARNING, "Fast shutdown requested");
1560 moonbr_terminate(MOONBR_EXITCODE_GRACEFUL);
1561 }
1562 if (moonbr_cond_terminate) {
1563 moonbr_initiate_shutdown();
1564 moonbr_cond_terminate = 0;
1565 }
1566 moonbr_cond_child = 0; /* must not be reset between moonbr_try_destroy_worker() and poll() */
1567 moonbr_now(&now);
1568 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1569 int terminated_worker_count = 0; /* allows shortcut for new worker creation */
1570 /* terminate idle workers when expired */
1571 if (timerisset(&pool->idle_timeout)) {
1572 while ((worker = pool->first_idle_worker) != NULL) {
1573 if (timercmp(&worker->idle_expiration, &now, >)) break;
1574 moonbr_pop_idle_worker(pool);
1575 moonbr_terminate_idle_worker(worker);
1576 }
1577 }
1578 /* mark listeners as connected when incoming connection is pending */
1579 for (listener=pool->first_idle_listener; listener; listener=next_listener) {
1580 next_listener = listener->next_listener; /* extra variable necessary due to changing list */
1581 if (listener->pollidx != -1) {
1582 if (moonbr_poll_fds[listener->pollidx].revents) {
1583 moonbr_poll_fds[listener->pollidx].revents = 0;
1584 moonbr_remove_idle_listener(listener);
1585 moonbr_add_connected_listener(listener);
1586 }
1587 } else if (
1588 listener->proto != MOONBR_PROTO_INTERVAL ||
1589 !timercmp(&listener->type_specific.interval.wakeup, &now, >)
1590 ) {
1591 moonbr_remove_idle_listener(listener);
1592 moonbr_add_connected_listener(listener);
1593 }
1594 }
1595 /* process input from child processes */
1596 for (i=0; i<moonbr_poll_worker_count; i++) {
1597 if (moonbr_poll_worker_fds[i].revents) {
1598 moonbr_poll_worker_fds[i].revents = 0;
1599 struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[i];
1600 switch (poll_worker->channel) {
1601 case MOONBR_POLL_WORKER_CONTROLCHANNEL:
1602 moonbr_read_controlchannel(poll_worker->worker);
1603 moonbr_interval_restart(poll_worker->worker, &now);
1604 break;
1605 case MOONBR_POLL_WORKER_ERRORCHANNEL:
1606 moonbr_read_errorchannel(poll_worker->worker);
1607 break;
1608 }
1609 }
1610 }
1611 /* collect dead child processes */
1612 for (worker=pool->first_worker; worker; worker=next_worker) {
1613 next_worker = worker->next_worker; /* extra variable necessary due to changing list */
1614 switch (moonbr_try_destroy_worker(worker)) {
1615 case MOONBR_DESTROY_PREPARE:
1616 pool->use_fork_error_wakeup = 1;
1617 break;
1618 case MOONBR_DESTROY_IDLE_OR_ASSIGNED:
1619 terminated_worker_count++;
1620 break;
1621 }
1622 }
1623 if (!moonbr_shutdown_in_progress) {
1624 /* connect listeners with idle workers */
1625 while (pool->first_connected_listener && pool->first_idle_worker) {
1626 moonbr_connect(pool);
1627 }
1628 /* create new worker processes */
1629 while (
1630 pool->total_worker_count < pool->max_fork && (
1631 pool->unassigned_worker_count < pool->pre_fork ||
1632 pool->total_worker_count < pool->min_fork
1633 )
1634 ) {
1635 if (pool->use_fork_error_wakeup) {
1636 if (timercmp(&pool->fork_error_wakeup, &now, >)) {
1637 moonbr_calc_wait(&wait, &pool->fork_error_wakeup);
1638 break;
1639 }
1640 } else {
1641 if (terminated_worker_count) {
1642 terminated_worker_count--;
1643 } else if (timercmp(&pool->fork_wakeup, &now, >)) {
1644 moonbr_calc_wait(&wait, &pool->fork_wakeup);
1645 break;
1646 }
1647 }
1648 if (moonbr_create_worker(pool, L)) {
1649 /* on error, enforce error delay */
1650 timeradd(&now, &pool->fork_error_delay, &pool->fork_error_wakeup);
1651 pool->use_fork_error_wakeup = 1;
1652 moonbr_calc_wait(&wait, &pool->fork_error_wakeup);
1653 break;
1654 } else {
1655 /* normal fork delay on success */
1656 timeradd(&now, &pool->fork_delay, &pool->fork_wakeup);
1657 timeradd(&now, &pool->fork_error_delay, &pool->fork_error_wakeup);
1658 pool->use_fork_error_wakeup = 0; /* gets set later if error occures during preparation */
1659 }
1660 }
1661 /* terminate excessive worker processes */
1662 while (
1663 pool->total_worker_count > pool->min_fork &&
1664 pool->idle_worker_count > pool->pre_fork
1665 ) {
1666 if (timerisset(&pool->exit_wakeup)) {
1667 if (timercmp(&pool->exit_wakeup, &now, >)) {
1668 moonbr_calc_wait(&wait, &pool->exit_wakeup);
1669 break;
1670 }
1671 moonbr_terminate_idle_worker(moonbr_pop_idle_worker(pool));
1672 timeradd(&now, &pool->exit_delay, &pool->exit_wakeup);
1673 } else {
1674 timeradd(&now, &pool->exit_delay, &pool->exit_wakeup);
1675 break;
1676 }
1677 }
1678 if (!(
1679 pool->total_worker_count > pool->min_fork &&
1680 pool->idle_worker_count > pool->pre_fork
1681 )) {
1682 timerclear(&pool->exit_wakeup); /* timer gets restarted later when there are excessive workers */
1683 }
1684 }
1685 /* optionally output worker count stats */
1686 if (moonbr_stat && pool->worker_count_stat) {
1687 pool->worker_count_stat = 0;
1688 moonbr_log(
1689 LOG_INFO,
1690 "Worker count for pool #%i: %i idle, %i assigned, %i total",
1691 pool->poolnum, pool->idle_worker_count,
1692 pool->total_worker_count - pool->unassigned_worker_count,
1693 pool->total_worker_count);
1694 }
1695 /* calculate wakeup time for interval listeners */
1696 for (listener=pool->first_idle_listener; listener; listener=listener->next_listener) {
1697 if (listener->proto == MOONBR_PROTO_INTERVAL) {
1698 moonbr_calc_wait(&wait, &listener->type_specific.interval.wakeup);
1699 }
1700 }
1701 /* calculate wakeup time for idle workers (only first idle worker is significant) */
1702 if (timerisset(&pool->idle_timeout) && pool->first_idle_worker) {
1703 moonbr_calc_wait(&wait, &pool->first_idle_worker->idle_expiration);
1704 }
1705 }
1706 /* terminate idle workers in case of shutdown and check if shutdown is complete */
1707 if (moonbr_shutdown_in_progress) {
1708 int remaining = 0;
1709 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1710 while (pool->idle_worker_count) {
1711 moonbr_terminate_idle_worker(moonbr_pop_idle_worker(pool));
1712 }
1713 if (pool->first_worker) remaining = 1;
1714 }
1715 if (!remaining) {
1716 moonbr_log(LOG_INFO, "All worker threads have terminated");
1717 moonbr_terminate(MOONBR_EXITCODE_GRACEFUL);
1718 }
1719 }
1720 if (moonbr_poll_refresh_needed) moonbr_poll_refresh();
1721 moonbr_cond_poll = 1;
1722 if (!moonbr_cond_child && !moonbr_cond_terminate && !moonbr_cond_interrupt) {
1723 int timeout;
1724 if (timerisset(&wait)) {
1725 if (timercmp(&wait, &now, <)) {
1726 moonbr_log(LOG_CRIT, "Internal error (should not happen): Future is in the past");
1727 moonbr_terminate_error();
1728 }
1729 timersub(&wait, &now, &wait);
1730 timeout = wait.tv_sec * 1000 + wait.tv_usec / 1000;
1731 } else {
1732 timeout = INFTIM;
1733 }
1734 if (moonbr_debug) {
1735 moonbr_log(LOG_DEBUG, "Waiting for I/O");
1736 }
1737 poll(moonbr_poll_fds, moonbr_poll_fds_count, timeout);
1738 } else {
1739 if (moonbr_debug) {
1740 moonbr_log(LOG_DEBUG, "Do not wait for I/O");
1741 }
1742 }
1743 moonbr_cond_poll = 0;
1744 moonbr_poll_reset_signal();
1745 }
1746 }
1749 /*** Lua interface ***/
1751 static int moonbr_lua_panic(lua_State *L) {
1752 const char *errmsg;
1753 errmsg = lua_tostring(L, -1);
1754 if (!errmsg) {
1755 if (lua_isnoneornil(L, -1)) errmsg = "(error message is nil)";
1756 else errmsg = "(error message is not a string)";
1757 }
1758 if (moonbr_pstate == MOONBR_PSTATE_FORKED) {
1759 fprintf(stderr, "Uncaught Lua error: %s\n", errmsg);
1760 exit(1);
1761 } else {
1762 moonbr_log(LOG_CRIT, "Uncaught Lua error: %s", errmsg);
1763 moonbr_terminate_error();
1764 }
1765 return 0;
1766 }
1768 static int moonbr_addtraceback(lua_State *L) {
1769 luaL_traceback(L, L, luaL_tolstring(L, 1, NULL), 1);
1770 return 1;
1771 }
1773 /* Memory allocator that allows limiting memory consumption */
1774 static void *moonbr_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
1775 (void)ud; /* not used */
1776 if (nsize == 0) {
1777 if (ptr) {
1778 moonbr_memory_usage -= osize;
1779 free(ptr);
1780 }
1781 return NULL;
1782 } else if (ptr) {
1783 if (
1784 moonbr_memory_limit &&
1785 nsize > osize &&
1786 moonbr_memory_usage + (nsize - osize) > moonbr_memory_limit
1787 ) {
1788 return NULL;
1789 } else {
1790 ptr = realloc(ptr, nsize);
1791 if (ptr) moonbr_memory_usage += nsize - osize;
1792 }
1793 } else {
1794 if (
1795 moonbr_memory_limit &&
1796 moonbr_memory_usage + nsize > moonbr_memory_limit
1797 ) {
1798 return NULL;
1799 } else {
1800 ptr = realloc(ptr, nsize);
1801 if (ptr) moonbr_memory_usage += nsize;
1802 }
1803 }
1804 return ptr;
1805 }
1807 static int moonbr_lua_tonatural(lua_State *L, int idx) {
1808 int isnum;
1809 lua_Number n;
1810 n = lua_tonumberx(L, idx, &isnum);
1811 if (isnum && n>=0 && n<INT_MAX && (lua_Number)(int)n == n) return n;
1812 else return -1;
1813 }
1815 static int moonbr_lua_totimeval(lua_State *L, int idx, struct timeval *value) {
1816 int isnum;
1817 lua_Number n;
1818 n = lua_tonumberx(L, idx, &isnum);
1819 if (isnum && n>=0 && n<=100000000) {
1820 value->tv_sec = n;
1821 value->tv_usec = 1e6 * (n - value->tv_sec);
1822 return 1;
1823 } else {
1824 return 0;
1825 }
1826 }
1828 static int moonbr_timeout(lua_State *L) {
1829 struct itimerval oldval;
1830 if (lua_isnoneornil(L, 1) && lua_isnoneornil(L, 2)) {
1831 getitimer(ITIMER_REAL, &oldval);
1832 } else {
1833 struct itimerval newval = {};
1834 timerclear(&newval.it_interval);
1835 timerclear(&newval.it_value);
1836 if (lua_toboolean(L, 1)) {
1837 luaL_argcheck(
1838 L, moonbr_lua_totimeval(L, 1, &newval.it_value), 1,
1839 "interval in seconds expected"
1840 );
1841 }
1842 if (lua_isnoneornil(L, 2)) {
1843 if (setitimer(ITIMER_REAL, &newval, &oldval)) {
1844 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1845 moonbr_terminate_error();
1846 }
1847 } else {
1848 getitimer(ITIMER_REAL, &oldval);
1849 if (!timerisset(&oldval.it_value)) {
1850 if (setitimer(ITIMER_REAL, &newval, NULL)) {
1851 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1852 moonbr_terminate_error();
1853 }
1854 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
1855 timerclear(&newval.it_value);
1856 if (setitimer(ITIMER_REAL, &newval, NULL)) {
1857 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1858 moonbr_terminate_error();
1859 }
1860 } else if (timercmp(&newval.it_value, &oldval.it_value, <)) {
1861 struct itimerval remval;
1862 if (setitimer(ITIMER_REAL, &newval, NULL)) {
1863 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1864 moonbr_terminate_error();
1865 }
1866 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
1867 getitimer(ITIMER_REAL, &remval);
1868 timersub(&oldval.it_value, &newval.it_value, &newval.it_value);
1869 timeradd(&newval.it_value, &remval.it_value, &newval.it_value);
1870 if (setitimer(ITIMER_REAL, &newval, NULL)) {
1871 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1872 moonbr_terminate_error();
1873 }
1874 } else {
1875 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
1876 }
1877 return lua_gettop(L) - 1;
1878 }
1879 }
1880 lua_pushnumber(L, oldval.it_value.tv_sec + 1e-6 * oldval.it_value.tv_usec);
1881 return 1;
1882 }
1884 #define moonbr_listen_init_pool_forkoption(luaname, cname, defval) do { \
1885 lua_getfield(L, 2, luaname); \
1886 pool->cname = lua_isnil(L, -1) ? (defval) : moonbr_lua_tonatural(L, -1); \
1887 } while(0)
1889 #define moonbr_listen_init_pool_timeoption(luaname, cname, defval, defvalu) ( \
1890 lua_getfield(L, 2, luaname), \
1891 lua_isnil(L, -1) ? ( \
1892 pool->cname.tv_sec = (defval), pool->cname.tv_usec = (defvalu), \
1893 1 \
1894 ) : ( \
1895 (lua_isboolean(L, -1) && !lua_toboolean(L, -1)) ? ( \
1896 pool->cname.tv_sec = 0, pool->cname.tv_usec = 0, \
1897 1 \
1898 ) : ( \
1899 moonbr_lua_totimeval(L, -1, &pool->cname) \
1900 ) \
1901 ) \
1902 )
1904 static int moonbr_listen_init_pool(lua_State *L) {
1905 struct moonbr_pool *pool;
1906 const char *proto;
1907 int is_main;
1908 int i;
1909 int dynamic = 0; /* nonzero = listeners exist which require dynamic worker creation */
1910 pool = lua_touserdata(L, 1);
1911 for (i=0; i<pool->listener_count; i++) {
1912 struct moonbr_listener *listener = &pool->listener[i];
1913 lua_settop(L, 2);
1914 #if LUA_VERSION_NUM >= 503
1915 lua_geti(L, 2, i+1);
1916 #else
1917 lua_pushinteger(L, i+1);
1918 lua_gettable(L, 2);
1919 #endif
1920 lua_getfield(L, 3, "proto");
1921 proto = lua_tostring(L, -1);
1922 is_main = !strcmp(proto, "main");
1923 if (proto && (is_main || !strcmp(proto, "interval"))) {
1924 listener->proto = MOONBR_PROTO_INTERVAL;
1925 lua_getfield(L, 3, "name");
1926 {
1927 const char *name = lua_tostring(L, -1);
1928 if (name) {
1929 char *name_dup = strdup(name);
1930 if (!name_dup) {
1931 moonbr_log(LOG_CRIT, "Memory allocation_error");
1932 moonbr_terminate_error();
1933 }
1934 listener->type_specific.interval.name = name_dup;
1935 }
1936 }
1937 if (is_main) {
1938 listener->type_specific.interval.main = 1;
1939 } else {
1940 listener->type_specific.interval.main = 0;
1941 dynamic = 1;
1942 lua_getfield(L, 3, "delay");
1943 if (
1944 !moonbr_lua_totimeval(L, -1, &listener->type_specific.interval.delay) ||
1945 !timerisset(&listener->type_specific.interval.delay)
1946 ) {
1947 luaL_error(L, "No valid interval delay specified; use listen{{proto=\"interval\", delay=...}, ...}");
1948 }
1949 lua_getfield(L, 3, "strict");
1950 if (!lua_isnil(L, -1)) {
1951 if (lua_isboolean(L, -1)) {
1952 if (lua_toboolean(L, -1)) listener->type_specific.interval.strict = 1;
1953 } else {
1954 luaL_error(L, "Option \"strict\" must be a boolean if set; use listen{{proto=\"interval\", strict=true, ...}, ...}");
1955 }
1956 }
1957 }
1958 } else if (proto && !strcmp(proto, "local")) {
1959 const char *path;
1960 const int path_maxlen = (
1961 sizeof(listener->type_specific.socket.addr.addr_un) -
1962 ((void *)listener->type_specific.socket.addr.addr_un.sun_path - (void *)&listener->type_specific.socket.addr.addr_un)
1963 ) - 1; /* one byte for termination */
1964 dynamic = 1;
1965 listener->proto = MOONBR_PROTO_LOCAL;
1966 lua_getfield(L, 3, "path");
1967 path = lua_tostring(L, -1);
1968 if (!path) {
1969 luaL_error(L, "No valid path specified for local socket; use listen{{proto=\"local\", path=...}, ...}");
1970 }
1971 if (strlen(path) > path_maxlen) {
1972 luaL_error(L, "Path name for local socket exceeded maximum length of %i characters", path_maxlen);
1973 }
1974 strcpy(listener->type_specific.socket.addr.addr_un.sun_path, path);
1975 } else if (proto && !strcmp(proto, "tcp")) {
1976 const char *host, *port;
1977 struct addrinfo hints = { 0, };
1978 struct addrinfo *res, *addrinfo;
1979 int errcode;
1980 const char *ip;
1981 dynamic = 1;
1982 lua_getfield(L, 3, "host");
1983 host = lua_isnil(L, -1) ? "::" : lua_tostring(L, -1);
1984 if (!host) {
1985 luaL_error(L, "No host specified; use listen{{proto=\"tcp\", host=...}, ...}");
1986 }
1987 lua_getfield(L, 3, "port");
1988 port = lua_tostring(L, -1);
1989 if (!port) {
1990 luaL_error(L, "No port specified; use listen{{proto=\"tcp\", host=...}, ...}");
1991 }
1992 hints.ai_family = AF_UNSPEC;
1993 hints.ai_socktype = SOCK_STREAM;
1994 hints.ai_protocol = IPPROTO_TCP;
1995 hints.ai_flags = AI_ADDRCONFIG | AI_PASSIVE;
1996 errcode = getaddrinfo(host, port, &hints, &res);
1997 if (errcode) {
1998 freeaddrinfo(res);
1999 if (errcode == EAI_SYSTEM) {
2000 char errmsg[MOONBR_MAXSTRERRORLEN] = MOONBR_STRERROR_R_MSG;
2001 strerror_r(errno, errmsg, MOONBR_MAXSTRERRORLEN); /* use thread-safe call in case child created threads */
2002 luaL_error(L, "Could not resolve host: %s: %s", gai_strerror(errcode), errmsg);
2003 } else {
2004 luaL_error(L, "Could not resolve host: %s", gai_strerror(errcode));
2005 }
2006 }
2007 for (addrinfo=res; addrinfo; addrinfo=addrinfo->ai_next) {
2008 if (addrinfo->ai_family == AF_INET6) goto moonbr_listen_init_pool_found;
2009 }
2010 for (addrinfo=res; addrinfo; addrinfo=addrinfo->ai_next) {
2011 if (addrinfo->ai_family == AF_INET) goto moonbr_listen_init_pool_found;
2012 }
2013 addrinfo = res;
2014 moonbr_listen_init_pool_found:
2015 if (addrinfo->ai_addrlen > sizeof(listener->type_specific.socket.addr)) {
2016 moonbr_log(LOG_CRIT, "Size of ai_addrlen is unexpectedly big (should not happen)");
2017 moonbr_terminate_error();
2018 }
2019 memcpy(&listener->type_specific.socket.addr, addrinfo->ai_addr, addrinfo->ai_addrlen);
2020 listener->type_specific.socket.addrlen = addrinfo->ai_addrlen;
2021 switch (addrinfo->ai_family) {
2022 case AF_INET6:
2023 ip = inet_ntop(
2024 addrinfo->ai_family,
2025 &((struct sockaddr_in6 *)addrinfo->ai_addr)->sin6_addr,
2026 listener->proto_specific.tcp.ip,
2027 INET6_ADDRSTRLEN
2028 );
2029 if (!ip) {
2030 moonbr_log(LOG_CRIT, "System error in inet_ntop call: %s", strerror(errno));
2031 moonbr_terminate_error();
2032 }
2033 listener->proto_specific.tcp.port = ntohs(((struct sockaddr_in6 *)addrinfo->ai_addr)->sin6_port);
2034 break;
2035 case AF_INET:
2036 ip = inet_ntop(
2037 addrinfo->ai_family,
2038 &((struct sockaddr_in *)addrinfo->ai_addr)->sin_addr,
2039 listener->proto_specific.tcp.ip,
2040 INET6_ADDRSTRLEN
2041 );
2042 if (!ip) {
2043 moonbr_log(LOG_CRIT, "System error in inet_ntop call: %s", strerror(errno));
2044 moonbr_terminate_error();
2045 }
2046 listener->proto_specific.tcp.port = ntohs(((struct sockaddr_in *)addrinfo->ai_addr)->sin_port);
2047 break;
2048 default:
2049 strcpy(listener->proto_specific.tcp.ip, "unknown");
2050 listener->proto_specific.tcp.port = 0;
2051 }
2052 listener->proto = MOONBR_PROTO_TCP;
2053 } else if (proto) {
2054 luaL_error(L, "Unknown protocol \"%s\"", proto);
2055 } else {
2056 luaL_error(L, "No valid protocol specified; use listen{{proto=..., ...}, ...}");
2057 }
2058 }
2059 lua_settop(L, 2);
2060 if (dynamic) {
2061 moonbr_listen_init_pool_forkoption("pre_fork", pre_fork, 1);
2062 moonbr_listen_init_pool_forkoption("min_fork", min_fork, pool->pre_fork > 2 ? pool->pre_fork : 2);
2063 moonbr_listen_init_pool_forkoption("max_fork", max_fork, pool->min_fork > 16 ? pool->min_fork : 16);
2064 if (!moonbr_listen_init_pool_timeoption("fork_delay", fork_delay, 0, 250000)) {
2065 luaL_error(L, "Option \"fork_delay\" is expected to be a non-negative number");
2066 }
2067 if (!moonbr_listen_init_pool_timeoption("fork_error_delay", fork_error_delay, 2, 0)) {
2068 luaL_error(L, "Option \"fork_error_delay\" is expected to be a non-negative number");
2069 }
2070 if (!moonbr_listen_init_pool_timeoption("exit_delay", exit_delay, 60, 0)) {
2071 luaL_error(L, "Option \"exit_delay\" is expected to be a non-negative number");
2072 }
2073 if (timercmp(&pool->fork_error_delay, &pool->fork_delay, <)) {
2074 pool->fork_error_delay = pool->fork_delay;
2075 }
2076 if (!moonbr_listen_init_pool_timeoption("idle_timeout", idle_timeout, 0, 0)) {
2077 luaL_error(L, "Option \"idle_timeout\" is expected to be a non-negative number");
2078 }
2079 } else {
2080 pool->pre_fork = 0;
2081 pool->min_fork = pool->listener_count;
2082 pool->max_fork = pool->listener_count;
2083 }
2084 lua_getfield(L, 2, "memory_limit");
2085 if (!lua_isnil(L, -1)) {
2086 int isnum;
2087 lua_Number n;
2088 n = lua_tonumberx(L, -1, &isnum);
2089 if (n < 0 || !isnum) {
2090 luaL_error(L, "Option \"memory_limit\" is expected to be a non-negative number");
2091 }
2092 pool->memory_limit = n;
2093 }
2094 lua_settop(L, 2);
2095 lua_getfield(L, 2, "prepare");
2096 if (!lua_isnil(L, -1) && !lua_isfunction(L, -1)) {
2097 luaL_error(L, "Option \"prepare\" must be nil or a function");
2098 }
2099 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
2100 lua_getfield(L, 2, "connect");
2101 if (!lua_isfunction(L, -1)) {
2102 luaL_error(L, "Option \"connect\" must be a function; use listen{{...}, {...}, connect=function(socket) ... end, ...}");
2103 }
2104 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
2105 lua_getfield(L, 2, "finish");
2106 if (!lua_isnil(L, -1) && !lua_isfunction(L, -1)) {
2107 luaL_error(L, "Option \"finish\" must be nil or a function");
2108 }
2109 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
2110 return 0;
2111 }
2113 static int moonbr_listen(lua_State *L) {
2114 struct moonbr_pool *pool;
2115 lua_Integer listener_count;
2116 if (moonbr_booted) luaL_error(L, "Moonbridge bootup is already complete");
2117 luaL_checktype(L, 1, LUA_TTABLE);
2118 listener_count = luaL_len(L, 1);
2119 if (!listener_count) luaL_error(L, "No listen ports specified; use listen{{proto=..., port=...},...}");
2120 if (listener_count > 100) luaL_error(L, "Too many listeners");
2121 pool = moonbr_create_pool(listener_count);
2122 lua_pushcfunction(L, moonbr_listen_init_pool);
2123 lua_pushlightuserdata(L, pool);
2124 lua_pushvalue(L, 1);
2125 if (lua_pcall(L, 2, 0, 0)) goto moonbr_listen_error;
2126 {
2127 int i;
2128 i = moonbr_start_pool(pool);
2129 if (i >= 0) {
2130 lua_pushfstring(L, "Could not initialize listener #%d: %s", i+1, strerror(errno));
2131 moonbr_listen_error:
2132 moonbr_destroy_pool(pool);
2133 lua_pushnil(L);
2134 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
2135 lua_pushnil(L);
2136 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
2137 lua_pushnil(L);
2138 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
2139 lua_error(L);
2140 }
2141 }
2142 return 0;
2143 }
2146 /*** Function to modify Lua's library path and/or cpath ***/
2148 #if defined(MOONBR_LUA_PATH) || defined(MOONBR_LUA_CPATH)
2149 static void moonbr_modify_path(lua_State *L, char *key, char *value) {
2150 int stackbase;
2151 stackbase = lua_gettop(L);
2152 lua_getglobal(L, "package");
2153 lua_getfield(L, stackbase+1, key);
2154 {
2155 const char *current_str;
2156 size_t current_strlen;
2157 luaL_Buffer buf;
2158 current_str = lua_tolstring(L, stackbase+2, ¤t_strlen);
2159 luaL_buffinit(L, &buf);
2160 if (current_str) {
2161 lua_pushvalue(L, stackbase+2);
2162 luaL_addvalue(&buf);
2163 if (current_strlen && current_str[current_strlen-1] != ';') {
2164 luaL_addchar(&buf, ';');
2165 }
2166 }
2167 luaL_addstring(&buf, value);
2168 luaL_pushresult(&buf);
2169 }
2170 lua_setfield(L, stackbase+1, key);
2171 lua_settop(L, stackbase);
2172 }
2173 #endif
2176 /*** Main function and command line invokation ***/
2178 static void moonbr_usage(int err, const char *cmd) {
2179 FILE *out;
2180 out = err ? stderr : stdout;
2181 if (!cmd) cmd = "moonbridge";
2182 fprintf(out, "Get this help message: %s {-h|--help}\n", cmd);
2183 fprintf(out, "Usage: %s \\\n", cmd);
2184 fprintf(out, " [-b|--background] \\\n");
2185 fprintf(out, " [-d|--debug] \\\n");
2186 fprintf(out, " [-f|--logfacility {DAEMON|USER|0|1|...|7}] \\\n");
2187 fprintf(out, " [-i|--logident <syslog ident> \\\n");
2188 fprintf(out, " [-l|--logfile <logfile>] \\\n");
2189 fprintf(out, " [-p|--pidfile <pidfile>] \\\n");
2190 fprintf(out, " [-s|--stats] \\\n");
2191 fprintf(out, " -- <Lua script> [<cmdline options for Lua script>]\n");
2192 exit(err);
2193 }
2195 #define moonbr_usage_error() moonbr_usage(MOONBR_EXITCODE_CMDLINEERROR, argc ? argv[0] : NULL)
2197 int main(int argc, char **argv) {
2198 {
2199 int daemonize = 0;
2200 int log_facility = LOG_USER;
2201 const char *log_ident = "moonbridge";
2202 const char *log_filename = NULL;
2203 const char *pid_filename = NULL;
2204 int option;
2205 struct option longopts[] = {
2206 { "background", no_argument, NULL, 'b' },
2207 { "debug", no_argument, NULL, 'd' },
2208 { "logfacility", required_argument, NULL, 'f' },
2209 { "help", no_argument, NULL, 'h' },
2210 { "logident", required_argument, NULL, 'i' },
2211 { "logfile", required_argument, NULL, 'l' },
2212 { "pidfile", required_argument, NULL, 'p' },
2213 { "stats", no_argument, NULL, 's' },
2214 { NULL, 0, NULL, 0 }
2215 };
2216 while ((option = getopt_long(argc, argv, "bdf:hi:l:p:s", longopts, NULL)) != -1) {
2217 switch (option) {
2218 case 'b':
2219 daemonize = 1;
2220 break;
2221 case 'd':
2222 moonbr_debug = 1;
2223 moonbr_stat = 1;
2224 break;
2225 case 'f':
2226 if (!strcmp(optarg, "DAEMON")) {
2227 log_facility = LOG_DAEMON;
2228 } else if (!strcmp(optarg, "USER")) {
2229 log_facility = LOG_USER;
2230 } else if (!strcmp(optarg, "0")) {
2231 log_facility = LOG_LOCAL0;
2232 } else if (!strcmp(optarg, "1")) {
2233 log_facility = LOG_LOCAL1;
2234 } else if (!strcmp(optarg, "2")) {
2235 log_facility = LOG_LOCAL2;
2236 } else if (!strcmp(optarg, "3")) {
2237 log_facility = LOG_LOCAL3;
2238 } else if (!strcmp(optarg, "4")) {
2239 log_facility = LOG_LOCAL4;
2240 } else if (!strcmp(optarg, "5")) {
2241 log_facility = LOG_LOCAL5;
2242 } else if (!strcmp(optarg, "6")) {
2243 log_facility = LOG_LOCAL6;
2244 } else if (!strcmp(optarg, "7")) {
2245 log_facility = LOG_LOCAL7;
2246 } else {
2247 moonbr_usage_error();
2248 }
2249 moonbr_use_syslog = 1;
2250 break;
2251 case 'h':
2252 moonbr_usage(MOONBR_EXITCODE_GRACEFUL, argv[0]);
2253 break;
2254 case 'i':
2255 log_ident = optarg;
2256 moonbr_use_syslog = 1;
2257 break;
2258 case 'l':
2259 log_filename = optarg;
2260 break;
2261 case 'p':
2262 pid_filename = optarg;
2263 break;
2264 case 's':
2265 moonbr_stat = 1;
2266 break;
2267 default:
2268 moonbr_usage_error();
2269 }
2270 }
2271 if (argc - optind < 1) moonbr_usage_error();
2272 if (pid_filename) {
2273 pid_t otherpid;
2274 while ((moonbr_pidfh = pidfile_open(pid_filename, 0644, &otherpid)) == NULL) {
2275 if (errno == EEXIST) {
2276 if (otherpid == -1) {
2277 fprintf(stderr, "PID file \"%s\" is already locked\n", pid_filename);
2278 } else {
2279 fprintf(stderr, "PID file \"%s\" is already locked by process with PID: %i\n", pid_filename, (int)otherpid);
2280 }
2281 exit(MOONBR_EXITCODE_ALREADYRUNNING);
2282 } else if (errno != EINTR) {
2283 fprintf(stderr, "Could not write PID file \"%s\": %s\n", pid_filename, strerror(errno));
2284 exit(MOONBR_EXITCODE_STARTUPERROR);
2285 }
2286 }
2287 }
2288 if (log_filename) {
2289 int logfd;
2290 while (
2291 ( logfd = flopen(
2292 log_filename,
2293 O_WRONLY|O_NONBLOCK|O_CREAT|O_APPEND|O_CLOEXEC,
2294 0640
2295 )
2296 ) < 0
2297 ) {
2298 if (errno == EWOULDBLOCK) {
2299 fprintf(stderr, "Logfile \"%s\" is locked\n", log_filename);
2300 exit(MOONBR_EXITCODE_ALREADYRUNNING);
2301 } else if (errno != EINTR) {
2302 fprintf(stderr, "Could not open logfile \"%s\": %s\n", log_filename, strerror(errno));
2303 exit(MOONBR_EXITCODE_STARTUPERROR);
2304 }
2305 }
2306 moonbr_logfile = fdopen(logfd, "a");
2307 if (!moonbr_logfile) {
2308 fprintf(stderr, "Could not open write stream to logfile \"%s\": %s\n", log_filename, strerror(errno));
2309 exit(MOONBR_EXITCODE_STARTUPERROR);
2310 }
2311 }
2312 if (daemonize == 0 && !moonbr_logfile) moonbr_logfile = stderr;
2313 if (moonbr_logfile) setlinebuf(moonbr_logfile);
2314 else moonbr_use_syslog = 1;
2315 if (moonbr_use_syslog) openlog(log_ident, LOG_NDELAY | LOG_PID, log_facility);
2316 if (daemonize) {
2317 if (daemon(1, 0)) {
2318 moonbr_log(LOG_ERR, "Could not daemonize moonbridge process");
2319 moonbr_terminate_error();
2320 }
2321 }
2322 }
2323 moonbr_log(LOG_NOTICE, "Starting moonbridge server");
2324 if (moonbr_pidfh && pidfile_write(moonbr_pidfh)) {
2325 moonbr_log(LOG_ERR, "Could not write pidfile (after locking)");
2326 }
2327 {
2328 lua_State *L;
2329 L = lua_newstate(moonbr_alloc, NULL);
2330 if (!L) {
2331 moonbr_log(LOG_CRIT, "Could not initialize Lua state");
2332 moonbr_terminate_error();
2333 }
2334 lua_atpanic(L, moonbr_lua_panic);
2335 lua_pushliteral(L, MOONBR_VERSION_STRING);
2336 lua_setglobal(L, "_MOONBRIDGE_VERSION");
2337 luaL_openlibs(L);
2338 luaL_requiref(L, "moonbridge_io", luaopen_moonbridge_io, 1);
2339 lua_pop(L, 1);
2340 #ifdef MOONBR_LUA_PATH
2341 moonbr_modify_path(L, "path", MOONBR_LUA_PATH);
2342 #endif
2343 #ifdef MOONBR_LUA_CPATH
2344 moonbr_modify_path(L, "cpath", MOONBR_LUA_CPATH);
2345 #endif
2346 lua_pushcfunction(L, moonbr_timeout);
2347 lua_setglobal(L, "timeout");
2348 lua_pushcfunction(L, moonbr_listen);
2349 lua_setglobal(L, "listen");
2350 lua_pushcfunction(L, moonbr_addtraceback); /* on stack position 1 */
2351 moonbr_log(LOG_INFO, "Loading \"%s\"", argv[optind]);
2352 if (luaL_loadfile(L, argv[optind])) {
2353 moonbr_log(LOG_ERR, "Error while loading \"%s\": %s", argv[optind], lua_tostring(L, -1));
2354 moonbr_terminate_error();
2355 }
2356 { int i; for (i=optind+1; i<argc; i++) lua_pushstring(L, argv[i]); }
2357 if (lua_pcall(L, argc-(optind+1), 0, 1)) {
2358 moonbr_log(LOG_ERR, "Error while executing \"%s\": %s", argv[optind], lua_tostring(L, -1));
2359 moonbr_terminate_error();
2360 }
2361 if (!moonbr_first_pool) {
2362 moonbr_log(LOG_WARNING, "No listener initialized.");
2363 moonbr_terminate_error();
2364 }
2365 lua_getglobal(L, "listen");
2366 lua_pushcfunction(L, moonbr_listen);
2367 if (lua_compare(L, -2, -1, LUA_OPEQ)) {
2368 lua_pushnil(L);
2369 lua_setglobal(L, "listen");
2370 }
2371 lua_settop(L, 1);
2372 lua_gc(L, LUA_GCCOLLECT, 0); /* collect garbage before forking later */
2373 moonbr_run(L);
2374 }
2375 return 0;
2376 }