moonbridge
view moonbridge.c @ 239:90e6db450677
merge
| author | jbe |
|---|---|
| date | Sat Aug 20 21:56:30 2016 +0200 (2016-08-20) |
| parents | 6d5f241588a0 |
| children | 30a04a6a45db |
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_MAIN 1
123 #define MOONBR_PROTO_INTERVAL 2
124 #define MOONBR_PROTO_LOCAL 3
125 #define MOONBR_PROTO_TCP 4
127 /* Data structure for a pool's listener that can accept incoming connections */
128 struct moonbr_listener {
129 struct moonbr_pool *pool;
130 struct moonbr_listener *prev_listener; /* previous idle or(!) connected listener */
131 struct moonbr_listener *next_listener; /* next idle or(!) connected listener */
132 int proto;
133 union {
134 struct {
135 char *name; /* name of interval passed to 'connect' function as 'interval' field in table */
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 if (getpid() == moonbr_masterpid) {
299 /* master process */
300 switch (sig) {
301 case SIGHUP:
302 case SIGINT:
303 /* fast shutdown requested */
304 moonbr_cond_interrupt = 1;
305 break;
306 case SIGTERM:
307 /* clean shutdown requested */
308 moonbr_cond_terminate = 1;
309 break;
310 case SIGCHLD:
311 /* child process terminated */
312 moonbr_cond_child = 1;
313 break;
314 }
315 if (moonbr_cond_poll) {
316 /* avoid race condition if signal handler is invoked right before poll() */
317 char buf[1] = {0};
318 write(moonbr_poll_signalfd_write, buf, 1);
319 }
320 } else {
321 /* child process forwards certain signals to parent process */
322 switch (sig) {
323 case SIGHUP:
324 case SIGINT:
325 case SIGTERM:
326 kill(moonbr_masterpid, sig);
327 }
328 }
329 }
331 /* Initialize signal handling */
332 static void moonbr_signal_init(){
333 moonbr_masterpid = getpid();
334 signal(SIGHUP, moonbr_signal);
335 signal(SIGINT, moonbr_signal);
336 signal(SIGTERM, moonbr_signal);
337 signal(SIGCHLD, moonbr_signal);
338 /* signal(SIGUSR1, moonbr_signal); */ /* might be used to terminate children gracefully */
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_MAIN:
516 /* nothing to do here: starting main thread is performed in moonbr_run() function */
517 moonbr_log(LOG_INFO, "Adding main thread");
518 break;
519 case MOONBR_PROTO_INTERVAL:
520 /* nothing to do here: starting intervals is performed in moonbr_run() function */
521 if (!listener->type_specific.interval.name) {
522 moonbr_log(LOG_INFO, "Adding unnamed interval listener");
523 } else {
524 moonbr_log(LOG_INFO, "Adding interval listener \"%s\"", listener->type_specific.interval.name);
525 }
526 break;
527 case MOONBR_PROTO_LOCAL:
528 moonbr_log(LOG_INFO, "Adding local socket listener for path \"%s\"", listener->type_specific.socket.addr.addr_un.sun_path);
529 listener->listenfd = socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
530 if (listener->listenfd == -1) goto moonbr_start_pool_error;
531 if (!unlink(listener->type_specific.socket.addr.addr_un.sun_path)) {
532 moonbr_log(LOG_WARNING, "Unlinked named socket \"%s\" prior to listening", listener->type_specific.socket.addr.addr_un.sun_path);
533 } else {
534 if (errno != ENOENT) {
535 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));
536 }
537 }
538 if (
539 bind(listener->listenfd, &listener->type_specific.socket.addr.addr_abstract, listener->type_specific.socket.addrlen)
540 ) goto moonbr_start_pool_error;
541 if (listen(listener->listenfd, MOONBR_LISTEN_BACKLOG)) goto moonbr_start_pool_error;
542 break;
543 case MOONBR_PROTO_TCP:
544 moonbr_log(LOG_INFO, "Adding TCP listener on interface \"%s\", port %i", listener->proto_specific.tcp.ip, listener->proto_specific.tcp.port);
545 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 */
546 if (listener->listenfd == -1) goto moonbr_start_pool_error;
547 {
548 /* avoid "Address already in use" error when restarting service */
549 static const int reuseval = 1;
550 if (setsockopt(
551 listener->listenfd, SOL_SOCKET, SO_REUSEADDR, &reuseval, sizeof(reuseval)
552 )) goto moonbr_start_pool_error;
553 }
554 {
555 /* default to send TCP RST when process terminates unexpectedly */
556 static const struct linger lingerval = {
557 .l_onoff = 1,
558 .l_linger = 0
559 };
560 if (setsockopt(
561 listener->listenfd, SOL_SOCKET, SO_LINGER, &lingerval, sizeof(lingerval)
562 )) goto moonbr_start_pool_error;
563 }
564 if (
565 bind(listener->listenfd, &listener->type_specific.socket.addr.addr_abstract, listener->type_specific.socket.addrlen)
566 ) goto moonbr_start_pool_error;
567 if (listen(listener->listenfd, MOONBR_LISTEN_BACKLOG)) goto moonbr_start_pool_error;
568 break;
569 default:
570 moonbr_log(LOG_CRIT, "Internal error (should not happen): Unexpected value in listener.proto field");
571 moonbr_terminate_error();
572 }
573 }
574 goto moonbr_start_pool_ok;
575 moonbr_start_pool_error:
576 {
577 int j = i;
578 int errno2 = errno;
579 for (; i>=0; i--) {
580 struct moonbr_listener *listener = &pool->listener[i];
581 if (listener->listenfd != -1) close(listener->listenfd);
582 }
583 errno = errno2;
584 return j;
585 }
586 }
587 moonbr_start_pool_ok:
588 pool->poolnum = ++moonbr_pool_count;
589 moonbr_log(LOG_INFO, "Pool #%i created", pool->poolnum);
590 if (moonbr_last_pool) moonbr_last_pool->next_pool = pool;
591 else moonbr_first_pool = pool;
592 moonbr_last_pool = pool;
593 return -1;
594 }
597 /*** Function to send data and a file descriptor to child process */
599 /* Sends control message of one bye plus optional file descriptor plus optional pointer to child process */
600 static void moonbr_send_control_message(struct moonbr_worker *worker, char status, int fd, void *ptr) {
601 {
602 struct iovec iovector = { .iov_base = &status, .iov_len = 1 }; /* carrying status byte */
603 char control_message_buffer[CMSG_SPACE(sizeof(int))] = {0, }; /* used to transfer file descriptor */
604 struct msghdr message = { .msg_iov = &iovector, .msg_iovlen = 1 }; /* data structure passed to sendmsg() call */
605 if (moonbr_debug) {
606 if (fd == -1) {
607 moonbr_log(LOG_DEBUG, "Sending control message \"%c\" to child process in pool #%i (PID %i)", (int)status, worker->pool->poolnum, (int)worker->pid);
608 } else {
609 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);
610 }
611 }
612 if (fd != -1) {
613 /* attach control message with file descriptor */
614 message.msg_control = control_message_buffer;
615 message.msg_controllen = CMSG_SPACE(sizeof(int));
616 {
617 struct cmsghdr *control_message = CMSG_FIRSTHDR(&message);
618 control_message->cmsg_level = SOL_SOCKET;
619 control_message->cmsg_type = SCM_RIGHTS;
620 control_message->cmsg_len = CMSG_LEN(sizeof(int));
621 memcpy(CMSG_DATA(control_message), &fd, sizeof(int));
622 }
623 }
624 while (sendmsg(worker->controlfd, &message, MSG_NOSIGNAL) < 0) {
625 if (errno == EPIPE) {
626 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));
627 return; /* do not close socket; socket is closed when reading from it */
628 }
629 if (errno != EINTR) {
630 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));
631 moonbr_terminate_error();
632 }
633 }
634 }
635 if (ptr) {
636 char buf[sizeof(void *)];
637 char *pos = buf;
638 int len = sizeof(void *);
639 ssize_t written;
640 if (moonbr_debug) {
641 moonbr_log(LOG_DEBUG, "Sending memory pointer to child process in pool #%i (PID %i)", (int)status, worker->pool->poolnum, (int)worker->pid);
642 }
643 memcpy(buf, &ptr, sizeof(void *));
644 while (len) {
645 written = send(worker->controlfd, pos, len, MSG_NOSIGNAL);
646 if (written > 0) {
647 pos += written;
648 len -= written;
649 } else if (errno == EPIPE) {
650 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));
651 return; /* do not close socket; socket is closed when reading from it */
652 } else if (errno != EINTR) {
653 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));
654 moonbr_terminate_error();
655 }
656 }
657 }
658 }
661 /*** Functions running in child process ***/
663 /* Logs an error in child process */
664 static void moonbr_child_log(const char *message) {
665 fprintf(stderr, "%s\n", message);
666 }
668 /* Logs a fatal error in child process and terminates process with error status */
669 static void moonbr_child_log_fatal(const char *message) {
670 moonbr_child_log(message);
671 exit(1);
672 }
674 /* Logs an error in child process while appending error string for global errno variable */
675 static void moonbr_child_log_errno(const char *message) {
676 char errmsg[MOONBR_MAXSTRERRORLEN] = MOONBR_STRERROR_R_MSG;
677 strerror_r(errno, errmsg, MOONBR_MAXSTRERRORLEN); /* use thread-safe call in case child created threads */
678 fprintf(stderr, "%s: %s\n", message, errmsg);
679 }
681 /* Logs a fatal error in child process while appending error string for errno and terminating process */
682 static void moonbr_child_log_errno_fatal(const char *message) {
683 moonbr_child_log_errno(message);
684 exit(1);
685 }
687 /* Receives a control message consisting of one character plus an optional file descriptor from parent process */
688 static void moonbr_child_receive_control_message(int socketfd, char *status, int *fd) {
689 struct iovec iovector = { .iov_base = status, .iov_len = 1 }; /* reference to status byte variable */
690 char control_message_buffer[CMSG_SPACE(sizeof(int))] = {0, }; /* used to receive file descriptor */
691 struct msghdr message = { /* data structure passed to recvmsg() call */
692 .msg_iov = &iovector,
693 .msg_iovlen = 1,
694 .msg_control = control_message_buffer,
695 .msg_controllen = CMSG_SPACE(sizeof(int))
696 };
697 {
698 int received;
699 while ((received = recvmsg(socketfd, &message, MSG_CMSG_CLOEXEC)) < 0) {
700 if (errno != EINTR) {
701 moonbr_child_log_errno_fatal("Error while trying to receive connection socket from parent process");
702 }
703 }
704 if (!received) {
705 moonbr_child_log_fatal("Unexpected EOF while trying to receive connection socket from parent process");
706 }
707 }
708 {
709 struct cmsghdr *control_message = CMSG_FIRSTHDR(&message);
710 if (control_message) {
711 if (control_message->cmsg_level != SOL_SOCKET) {
712 moonbr_child_log_fatal("Received control message with cmsg_level not equal to SOL_SOCKET");
713 }
714 if (control_message->cmsg_type != SCM_RIGHTS) {
715 moonbr_child_log_fatal("Received control message with cmsg_type not equal to SCM_RIGHTS");
716 }
717 memcpy(fd, CMSG_DATA(control_message), sizeof(int));
718 } else {
719 *fd = -1;
720 }
721 }
722 }
724 /* Receives a pointer from parent process */
725 static void *moonbr_child_receive_pointer(int socketfd) {
726 char buf[sizeof(void *)];
727 char *pos = buf;
728 int len = sizeof(void *);
729 ssize_t bytes_read;
730 while (len) {
731 bytes_read = recv(socketfd, pos, len, 0);
732 if (bytes_read > 0) {
733 pos += bytes_read;
734 len -= bytes_read;
735 } else if (!bytes_read) {
736 moonbr_child_log_fatal("Unexpected EOF while trying to receive memory pointer from parent process");
737 } else if (errno != EINTR) {
738 moonbr_child_log_errno_fatal("Error while trying to receive memory pointer from parent process");
739 }
740 }
741 {
742 void *ptr; /* avoid breaking strict-aliasing rules */
743 memcpy(&ptr, buf, sizeof(void *));
744 return ptr;
745 }
746 }
748 /* Main function of child process to be called after fork() and file descriptor rearrangement */
749 void moonbr_child_run(struct moonbr_pool *pool, lua_State *L) {
750 char controlmsg;
751 int fd;
752 struct itimerval notimer = { { 0, }, { 0, } };
753 lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
754 if (lua_isnil(L, -1)) lua_pop(L, 1);
755 else if (lua_pcall(L, 0, 0, 1)) {
756 fprintf(stderr, "Error in \"prepare\" function: %s\n", lua_tostring(L, -1));
757 exit(1);
758 }
759 while (1) {
760 struct moonbr_listener *listener;
761 if (setitimer(ITIMER_REAL, ¬imer, NULL)) {
762 moonbr_child_log_errno_fatal("Could not reset ITIMER_REAL via setitimer()");
763 }
764 controlmsg = MOONBR_STATUS_IDLE;
765 if (write(MOONBR_FD_CONTROL, &controlmsg, 1) <= 0) {
766 moonbr_child_log_errno_fatal("Error while sending ready message to parent process");
767 }
768 moonbr_child_receive_control_message(MOONBR_FD_CONTROL, &controlmsg, &fd);
769 if (!(
770 (controlmsg == MOONBR_COMMAND_TERMINATE && fd == -1) ||
771 (controlmsg == MOONBR_COMMAND_CONNECT)
772 )) {
773 moonbr_child_log_fatal("Received illegal control message from parent process");
774 }
775 if (controlmsg == MOONBR_COMMAND_TERMINATE) break;
776 listener = moonbr_child_receive_pointer(MOONBR_FD_CONTROL);
777 if (
778 listener->proto != MOONBR_PROTO_LOCAL &&
779 listener->proto != MOONBR_PROTO_TCP &&
780 fd >= 0
781 ) {
782 moonbr_child_log_fatal("Received unexpected file descriptor from parent process");
783 } else if (
784 listener->proto != MOONBR_PROTO_MAIN &&
785 listener->proto != MOONBR_PROTO_INTERVAL &&
786 fd < 0
787 ) {
788 moonbr_child_log_fatal("Missing file descriptor from parent process");
789 }
790 if (fd >= 0) moonbr_io_pushhandle(L, fd);
791 lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
792 if (fd < 0) {
793 lua_newtable(L);
794 if (listener->proto == MOONBR_PROTO_MAIN) {
795 lua_pushboolean(L, 1);
796 lua_setfield(L, -2, "main");
797 } else if (listener->proto == MOONBR_PROTO_INTERVAL) {
798 lua_pushstring(L,
799 listener->type_specific.interval.name ?
800 listener->type_specific.interval.name : ""
801 );
802 lua_setfield(L, -2, "interval");
803 }
804 } else {
805 lua_pushvalue(L, -2);
806 }
807 if (lua_pcall(L, 1, 1, 1)) {
808 fprintf(stderr, "Error in \"connect\" function: %s\n", lua_tostring(L, -1));
809 exit(1);
810 }
811 if (fd >= 0) moonbr_io_closehandle(L, -2, 0); /* attemt clean close */
812 if (lua_type(L, -1) != LUA_TBOOLEAN || !lua_toboolean(L, -1)) break;
813 #ifdef MOONBR_LUA_PANIC_BUG_WORKAROUND
814 lua_settop(L, 2);
815 #else
816 lua_settop(L, 1);
817 #endif
818 }
819 controlmsg = MOONBR_STATUS_GOODBYE;
820 if (write(MOONBR_FD_CONTROL, &controlmsg, 1) <= 0) {
821 moonbr_child_log_errno_fatal("Error while sending goodbye message to parent process");
822 }
823 if (close(MOONBR_FD_CONTROL) && errno != EINTR) {
824 moonbr_child_log_errno("Error while closing control socket");
825 }
826 lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
827 if (lua_isnil(L, -1)) lua_pop(L, 1);
828 else if (lua_pcall(L, 0, 0, 1)) {
829 fprintf(stderr, "Error in \"finish\" function: %s\n", lua_tostring(L, -1));
830 exit(1);
831 }
832 lua_close(L);
833 exit(0);
834 }
837 /*** Functions to spawn child process ***/
839 /* Helper function to send an error message to a file descriptor (not needing a file stream) */
840 static void moonbr_child_emergency_print(int fd, char *message) {
841 size_t len = strlen(message);
842 ssize_t written;
843 while (len) {
844 written = write(fd, message, len);
845 if (written > 0) {
846 message += written;
847 len -= written;
848 } else {
849 if (written != -1 || errno != EINTR) break;
850 }
851 }
852 }
854 /* Helper function to send an error message plus a text for errno to a file descriptor and terminate the process */
855 static void moonbr_child_emergency_error(int fd, char *message) {
856 int errno2 = errno;
857 moonbr_child_emergency_print(fd, message);
858 moonbr_child_emergency_print(fd, ": ");
859 moonbr_child_emergency_print(fd, strerror(errno2));
860 moonbr_child_emergency_print(fd, "\n");
861 exit(1);
862 }
864 /* Creates a child process and (in case of success) registers it in the 'struct moonbr_pool' structure */
865 static int moonbr_create_worker(struct moonbr_pool *pool, lua_State *L) {
866 struct moonbr_worker *worker;
867 worker = calloc(1, sizeof(struct moonbr_worker));
868 if (!worker) {
869 moonbr_log(LOG_CRIT, "Memory allocation error");
870 return -1;
871 }
872 worker->pool = pool;
873 {
874 int controlfds[2];
875 int errorfds[2];
876 if (socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, controlfds)) {
877 moonbr_log(LOG_ERR, "Could not create control socket pair for communcation with child process: %s", strerror(errno));
878 free(worker);
879 return -1;
880 }
881 if (socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, errorfds)) {
882 moonbr_log(LOG_ERR, "Could not create socket pair to redirect stderr of child process: %s", strerror(errno));
883 close(controlfds[0]);
884 close(controlfds[1]);
885 free(worker);
886 return -1;
887 }
888 if (moonbr_logfile && fflush(moonbr_logfile)) {
889 moonbr_log(LOG_CRIT, "Could not flush log file prior to forking: %s", strerror(errno));
890 moonbr_terminate_error();
891 }
892 worker->pid = fork();
893 if (worker->pid == -1) {
894 moonbr_log(LOG_ERR, "Could not fork: %s", strerror(errno));
895 close(controlfds[0]);
896 close(controlfds[1]);
897 close(errorfds[0]);
898 close(errorfds[1]);
899 free(worker);
900 return -1;
901 } else if (!worker->pid) {
902 moonbr_pstate = MOONBR_PSTATE_FORKED;
903 #ifdef MOONBR_LUA_PANIC_BUG_WORKAROUND
904 lua_pushliteral(L, "Failed to pass error message due to bug in Lua panic handler (hint: not enough memory?)");
905 #endif
906 moonbr_memory_limit = pool->memory_limit;
907 if (moonbr_pidfh && pidfile_close(moonbr_pidfh)) {
908 moonbr_child_emergency_error(errorfds[1], "Could not close PID file in forked child process");
909 }
910 if (moonbr_logfile && moonbr_logfile != stderr && fclose(moonbr_logfile)) {
911 moonbr_child_emergency_error(errorfds[1], "Could not close log file in forked child process");
912 }
913 if (dup2(errorfds[1], MOONBR_FD_STDERR) == -1) {
914 moonbr_child_emergency_error(errorfds[1], "Could not duplicate socket to stderr file descriptor");
915 }
916 if (dup2(controlfds[1], MOONBR_FD_CONTROL) == -1) {
917 moonbr_child_emergency_error(errorfds[1], "Could not duplicate control socket");
918 }
919 closefrom(MOONBR_FD_END);
920 moonbr_child_run(pool, L);
921 }
922 if (moonbr_stat) {
923 moonbr_log(LOG_INFO, "Created new worker in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
924 }
925 worker->controlfd = controlfds[0];
926 worker->errorfd = errorfds[0];
927 if (close(controlfds[1]) && errno != EINTR) {
928 moonbr_log(LOG_CRIT, "Could not close opposite end of control file descriptor after forking");
929 moonbr_terminate_error();
930 }
931 if (close(errorfds[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 }
936 worker->prev_worker = pool->last_worker;
937 if (worker->prev_worker) worker->prev_worker->next_worker = worker;
938 else pool->first_worker = worker;
939 pool->last_worker = worker;
940 pool->unassigned_worker_count++;
941 pool->total_worker_count++;
942 pool->worker_count_stat = 1;
943 moonbr_poll_refresh_needed = 1;
944 return 0; /* return zero only in case of success */
945 }
948 /*** Functions for queues of 'struct moonbr_listener' ***/
950 /* Appends a 'struct moonbr_listener' to the queue of idle listeners and registers it for poll() */
951 static void moonbr_add_idle_listener(struct moonbr_listener *listener) {
952 listener->prev_listener = listener->pool->last_idle_listener;
953 if (listener->prev_listener) listener->prev_listener->next_listener = listener;
954 else listener->pool->first_idle_listener = listener;
955 listener->pool->last_idle_listener = listener;
956 if (listener->pollidx != -1) moonbr_poll_fds[listener->pollidx].events |= POLLIN;
957 }
959 /* Removes a 'struct moonbr_listener' from the queue of idle listeners and unregisters it from poll() */
960 static void moonbr_remove_idle_listener(struct moonbr_listener *listener) {
961 if (listener->prev_listener) listener->prev_listener->next_listener = listener->next_listener;
962 else listener->pool->first_idle_listener = listener->next_listener;
963 if (listener->next_listener) listener->next_listener->prev_listener = listener->prev_listener;
964 else listener->pool->last_idle_listener = listener->prev_listener;
965 listener->prev_listener = NULL;
966 listener->next_listener = NULL;
967 if (listener->pollidx != -1) moonbr_poll_fds[listener->pollidx].events &= ~POLLIN;
968 }
970 /* Adds a listener to the queue of connected listeners (i.e. waiting to have their incoming connection accepted) */
971 static void moonbr_add_connected_listener(struct moonbr_listener *listener) {
972 listener->prev_listener = listener->pool->last_connected_listener;
973 if (listener->prev_listener) listener->prev_listener->next_listener = listener;
974 else listener->pool->first_connected_listener = listener;
975 listener->pool->last_connected_listener = listener;
976 }
978 /* Removes and returns the first connected listener in the queue */
979 static struct moonbr_listener *moonbr_pop_connected_listener(struct moonbr_pool *pool) {
980 struct moonbr_listener *listener = pool->first_connected_listener;
981 listener->pool->first_connected_listener = listener->next_listener;
982 if (listener->pool->first_connected_listener) listener->pool->first_connected_listener->prev_listener = NULL;
983 else listener->pool->last_connected_listener = NULL;
984 listener->next_listener = NULL;
985 return listener;
986 }
989 /*** Functions to handle polling ***/
991 /* Returns an index to a new initialized entry in moonbr_poll_fds[] */
992 int moonbr_poll_fds_nextindex() {
993 if (moonbr_poll_fds_count >= moonbr_poll_fds_bufsize) {
994 if (moonbr_poll_fds_bufsize) moonbr_poll_fds_bufsize *= 2;
995 else moonbr_poll_fds_bufsize = 1;
996 moonbr_poll_fds = realloc(
997 moonbr_poll_fds, moonbr_poll_fds_bufsize * sizeof(struct pollfd)
998 );
999 if (!moonbr_poll_fds) {
1000 moonbr_log(LOG_CRIT, "Memory allocation error");
1001 moonbr_terminate_error();
1002 }
1003 }
1004 moonbr_poll_fds[moonbr_poll_fds_count] = (struct pollfd){0, };
1005 return moonbr_poll_fds_count++;
1006 }
1008 /* Returns an index to a new initialized entry in moonbr_poll_workers[] */
1009 int moonbr_poll_workers_nextindex() {
1010 if (moonbr_poll_worker_count >= moonbr_poll_workers_bufsize) {
1011 if (moonbr_poll_workers_bufsize) moonbr_poll_workers_bufsize *= 2;
1012 else moonbr_poll_workers_bufsize = 1;
1013 moonbr_poll_workers = realloc(
1014 moonbr_poll_workers, moonbr_poll_workers_bufsize * sizeof(struct moonbr_poll_worker)
1015 );
1016 if (!moonbr_poll_workers) {
1017 moonbr_log(LOG_CRIT, "Memory allocation error");
1018 moonbr_terminate_error();
1019 }
1020 }
1021 moonbr_poll_workers[moonbr_poll_worker_count] = (struct moonbr_poll_worker){0, };
1022 return moonbr_poll_worker_count++;
1023 }
1025 /* Queues all listeners as idle, and initializes static part of moonbr_poll_fds[], which is passed to poll() */
1026 static void moonbr_poll_init() {
1027 if (socketpair(
1028 PF_LOCAL,
1029 SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
1030 0,
1031 moonbr_poll_signalfds
1032 )) {
1033 moonbr_log(LOG_CRIT, "Could not create socket pair for signal delivery during polling: %s", strerror(errno));
1034 moonbr_terminate_error();
1035 }
1036 {
1037 int j = moonbr_poll_fds_nextindex();
1038 struct pollfd *pollfd = &moonbr_poll_fds[j];
1039 pollfd->fd = moonbr_poll_signalfd_read;
1040 pollfd->events = POLLIN;
1041 }
1042 {
1043 struct moonbr_pool *pool;
1044 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1045 int i;
1046 for (i=0; i<pool->listener_count; i++) {
1047 struct moonbr_listener *listener = &pool->listener[i];
1048 if (listener->listenfd != -1) {
1049 int j = moonbr_poll_fds_nextindex();
1050 listener->pollidx = j;
1051 moonbr_poll_fds[j].fd = listener->listenfd;
1052 }
1053 moonbr_add_idle_listener(listener);
1054 }
1055 }
1056 }
1057 moonbr_poll_fds_static_count = moonbr_poll_fds_count; /* remember size of static part of array */
1058 }
1060 /* Disables polling of all listeners (required for clean shutdown) */
1061 static void moonbr_poll_shutdown() {
1062 int i;
1063 for (i=1; i<moonbr_poll_fds_static_count; i++) {
1064 moonbr_poll_fds[i].fd = -1;
1065 }
1066 }
1068 /* (Re)builds dynamic part of moonbr_poll_fds[] array, and (re)builds moonbr_poll_workers[] array */
1069 static void moonbr_poll_refresh() {
1070 moonbr_poll_refresh_needed = 0;
1071 moonbr_poll_fds_count = moonbr_poll_fds_static_count;
1072 moonbr_poll_worker_count = 0;
1073 {
1074 struct moonbr_pool *pool;
1075 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1076 struct moonbr_worker *worker;
1077 for (worker=pool->first_worker; worker; worker=worker->next_worker) {
1078 if (worker->controlfd != -1) {
1079 int j = moonbr_poll_fds_nextindex();
1080 int k = moonbr_poll_workers_nextindex();
1081 struct pollfd *pollfd = &moonbr_poll_fds[j];
1082 struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[k];
1083 pollfd->fd = worker->controlfd;
1084 pollfd->events = POLLIN;
1085 poll_worker->channel = MOONBR_POLL_WORKER_CONTROLCHANNEL;
1086 poll_worker->worker = worker;
1087 }
1088 if (worker->errorfd != -1) {
1089 int j = moonbr_poll_fds_nextindex();
1090 int k = moonbr_poll_workers_nextindex();
1091 struct pollfd *pollfd = &moonbr_poll_fds[j];
1092 struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[k];
1093 pollfd->fd = worker->errorfd;
1094 pollfd->events = POLLIN;
1095 poll_worker->channel = MOONBR_POLL_WORKER_ERRORCHANNEL;
1096 poll_worker->worker = worker;
1097 }
1098 }
1099 }
1100 }
1101 }
1103 /* resets socket and 'revents' field of moonbr_poll_fds[] for signal delivery just before poll() is called */
1104 static void moonbr_poll_reset_signal() {
1105 ssize_t readcount;
1106 char buf[1];
1107 moonbr_poll_fds[0].revents = 0;
1108 while ((readcount = read(moonbr_poll_signalfd_read, buf, 1)) < 0) {
1109 if (errno == EAGAIN) break;
1110 if (errno != EINTR) {
1111 moonbr_log(LOG_CRIT, "Error while reading from signal delivery socket: %s", strerror(errno));
1112 moonbr_terminate_error();
1113 }
1114 }
1115 if (!readcount) {
1116 moonbr_log(LOG_CRIT, "Unexpected EOF when reading from signal delivery socket: %s", strerror(errno));
1117 moonbr_terminate_error();
1118 }
1119 }
1122 /*** Shutdown initiation ***/
1124 /* Sets global variable 'moonbr_shutdown_in_progress', closes listeners, and demands worker termination */
1125 static void moonbr_initiate_shutdown() {
1126 struct moonbr_pool *pool;
1127 int i;
1128 if (moonbr_shutdown_in_progress) {
1129 moonbr_log(LOG_NOTICE, "Shutdown already in progress");
1130 return;
1131 }
1132 moonbr_shutdown_in_progress = 1;
1133 moonbr_log(LOG_NOTICE, "Initiate shutdown");
1134 for (pool = moonbr_first_pool; pool; pool = pool->next_pool) {
1135 for (i=0; i<pool->listener_count; i++) {
1136 struct moonbr_listener *listener = &pool->listener[i];
1137 if (listener->listenfd != -1) {
1138 if (close(listener->listenfd) && errno != EINTR) {
1139 moonbr_log(LOG_CRIT, "Could not close listening socket: %s", strerror(errno));
1140 moonbr_terminate_error();
1141 }
1142 }
1143 }
1144 }
1145 moonbr_poll_shutdown(); /* avoids loops due to error condition when polling closed listeners */
1146 /* sending SIGUSR1 to children might be used to terminate children gracefully */
1147 /*
1148 {
1149 pid_t pgrp = getpgrp();
1150 moonbr_log(LOG_INFO, "Sending SIGUSR1 to all processes in group %i", (int)pgrp);
1151 if (killpg(pgrp, SIGUSR1)) {
1152 moonbr_log(LOG_WARNING, "Error while sending SIGUSR1 to own process group: %s", strerror(errno));
1153 }
1154 }
1155 */
1156 }
1159 /*** Functions to handle previously created 'struct moonbr_worker' structures ***/
1161 #define moonbr_try_destroy_worker_stat(str, field) \
1162 moonbr_log(LOG_INFO, "Resource usage in pool #%i for PID %i: " str " %li", worker->pool->poolnum, (int)worker->pid, (long)childusage.field);
1164 /* Destroys a worker structure if socket connections have been closed and child process has terminated */
1165 static int moonbr_try_destroy_worker(struct moonbr_worker *worker) {
1166 if (worker->controlfd != -1 || worker->errorfd != -1) return MOONBR_DESTROY_NONE;
1167 {
1168 int childstatus;
1169 struct rusage childusage;
1170 {
1171 pid_t waitedpid;
1172 while (
1173 (waitedpid = wait4(worker->pid, &childstatus, WNOHANG, &childusage)) == -1
1174 ) {
1175 if (errno != EINTR) {
1176 moonbr_log(LOG_CRIT, "Error in wait4() call: %s", strerror(errno));
1177 moonbr_terminate_error();
1178 }
1179 }
1180 if (!waitedpid) return 0; /* return 0 if worker couldn't be destroyed */
1181 if (waitedpid != worker->pid) {
1182 moonbr_log(LOG_CRIT, "Wrong PID returned by wait4() call");
1183 moonbr_terminate_error();
1184 }
1185 }
1186 if (WIFEXITED(childstatus)) {
1187 if (WEXITSTATUS(childstatus) || moonbr_stat) {
1188 moonbr_log(
1189 WEXITSTATUS(childstatus) ? LOG_WARNING : LOG_INFO,
1190 "Child process in pool #%i with PID %i returned with exit code %i", worker->pool->poolnum, (int)worker->pid, WEXITSTATUS(childstatus)
1191 );
1192 }
1193 } else if (WIFSIGNALED(childstatus)) {
1194 if (WCOREDUMP(childstatus)) {
1195 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));
1196 } else if (WTERMSIG(childstatus) == SIGALRM) {
1197 moonbr_log(LOG_WARNING, "Child process in pool #%i with PID %i exited prematurely due to timeout", worker->pool->poolnum, (int)worker->pid);
1198 } else {
1199 moonbr_log(LOG_ERR, "Child process in pool #%i with PID %i died from signal %i", worker->pool->poolnum, (int)worker->pid, WTERMSIG(childstatus));
1200 }
1201 } else {
1202 moonbr_log(LOG_CRIT, "Illegal exit status from child process in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
1203 moonbr_terminate_error();
1204 }
1205 if (moonbr_stat) {
1206 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));
1207 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));
1208 moonbr_try_destroy_worker_stat("max resident set size", ru_maxrss);
1209 moonbr_try_destroy_worker_stat("integral shared memory size", ru_ixrss);
1210 moonbr_try_destroy_worker_stat("integral unshared data", ru_idrss);
1211 moonbr_try_destroy_worker_stat("integral unshared stack", ru_isrss);
1212 moonbr_try_destroy_worker_stat("page replaims", ru_minflt);
1213 moonbr_try_destroy_worker_stat("page faults", ru_majflt);
1214 moonbr_try_destroy_worker_stat("swaps", ru_nswap);
1215 moonbr_try_destroy_worker_stat("block input operations", ru_inblock);
1216 moonbr_try_destroy_worker_stat("block output operations", ru_oublock);
1217 moonbr_try_destroy_worker_stat("messages sent", ru_msgsnd);
1218 moonbr_try_destroy_worker_stat("messages received", ru_msgrcv);
1219 moonbr_try_destroy_worker_stat("signals received", ru_nsignals);
1220 moonbr_try_destroy_worker_stat("voluntary context switches", ru_nvcsw);
1221 moonbr_try_destroy_worker_stat("involuntary context switches", ru_nivcsw);
1222 }
1223 }
1224 {
1225 int retval = (
1226 (worker->idle || worker->assigned) ?
1227 MOONBR_DESTROY_IDLE_OR_ASSIGNED :
1228 MOONBR_DESTROY_PREPARE
1229 );
1230 if (worker->main) moonbr_initiate_shutdown();
1231 if (worker->prev_worker) worker->prev_worker->next_worker = worker->next_worker;
1232 else worker->pool->first_worker = worker->next_worker;
1233 if (worker->next_worker) worker->next_worker->prev_worker = worker->prev_worker;
1234 else worker->pool->last_worker = worker->prev_worker;
1235 if (worker->idle) {
1236 if (worker->prev_idle_worker) worker->prev_idle_worker->next_idle_worker = worker->next_idle_worker;
1237 else worker->pool->first_idle_worker = worker->next_idle_worker;
1238 if (worker->next_idle_worker) worker->next_idle_worker->prev_idle_worker = worker->prev_idle_worker;
1239 else worker->pool->last_idle_worker = worker->prev_idle_worker;
1240 worker->pool->idle_worker_count--;
1241 }
1242 if (!worker->assigned) worker->pool->unassigned_worker_count--;
1243 worker->pool->total_worker_count--;
1244 worker->pool->worker_count_stat = 1;
1245 if (worker->errorlinebuf) free(worker->errorlinebuf);
1246 free(worker);
1247 return retval;
1248 }
1249 }
1251 /* Marks a worker as idle and stores it in a queue, optionally setting 'idle_expiration' value */
1252 static void moonbr_add_idle_worker(struct moonbr_worker *worker) {
1253 worker->prev_idle_worker = worker->pool->last_idle_worker;
1254 if (worker->prev_idle_worker) worker->prev_idle_worker->next_idle_worker = worker;
1255 else worker->pool->first_idle_worker = worker;
1256 worker->pool->last_idle_worker = worker;
1257 worker->idle = 1;
1258 worker->pool->idle_worker_count++;
1259 if (worker->assigned) {
1260 worker->assigned = 0;
1261 worker->pool->unassigned_worker_count++;
1262 }
1263 worker->pool->worker_count_stat = 1;
1264 if (timerisset(&worker->pool->idle_timeout)) {
1265 struct timeval now;
1266 moonbr_now(&now);
1267 timeradd(&now, &worker->pool->idle_timeout, &worker->idle_expiration);
1268 }
1269 }
1271 /* Pops a worker from the queue of idle workers (idle queue must not be empty) */
1272 static struct moonbr_worker *moonbr_pop_idle_worker(struct moonbr_pool *pool) {
1273 struct moonbr_worker *worker;
1274 worker = pool->first_idle_worker;
1275 pool->first_idle_worker = worker->next_idle_worker;
1276 if (pool->first_idle_worker) pool->first_idle_worker->prev_idle_worker = NULL;
1277 else pool->last_idle_worker = NULL;
1278 worker->next_idle_worker = NULL;
1279 worker->idle = 0;
1280 worker->pool->idle_worker_count--;
1281 worker->assigned = 1;
1282 worker->pool->unassigned_worker_count--;
1283 worker->pool->worker_count_stat = 1;
1284 return worker;
1285 }
1288 /*** Functions to communicate with child processes ***/
1290 /* Tells child process to terminate */
1291 static void moonbr_terminate_idle_worker(struct moonbr_worker *worker) {
1292 moonbr_send_control_message(worker, MOONBR_COMMAND_TERMINATE, -1, NULL);
1293 }
1295 /* Handles status messages from child process */
1296 static void moonbr_read_controlchannel(struct moonbr_worker *worker) {
1297 char controlmsg;
1298 {
1299 ssize_t bytes_read;
1300 while ((bytes_read = read(worker->controlfd, &controlmsg, 1)) <= 0) {
1301 if (bytes_read == 0 || errno == ECONNRESET) {
1302 moonbr_log(LOG_WARNING, "Child process in pool #%i with PID %i unexpectedly closed control socket", worker->pool->poolnum, (int)worker->pid);
1303 if (close(worker->controlfd) && errno != EINTR) {
1304 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));
1305 moonbr_terminate_error();
1306 }
1307 worker->controlfd = -1;
1308 moonbr_poll_refresh_needed = 1;
1309 return;
1310 }
1311 if (errno != EINTR) {
1312 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));
1313 moonbr_terminate_error();
1314 }
1315 }
1316 }
1317 if (worker->idle) {
1318 moonbr_log(LOG_CRIT, "Unexpected data from supposedly idle child process in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
1319 moonbr_terminate_error();
1320 }
1321 if (moonbr_debug) {
1322 moonbr_log(LOG_DEBUG, "Received control message from child in pool #%i with PID %i: \"%c\"", worker->pool->poolnum, (int)worker->pid, (int)controlmsg);
1323 }
1324 switch (controlmsg) {
1325 case MOONBR_STATUS_IDLE:
1326 if (moonbr_stat) {
1327 moonbr_log(LOG_INFO, "Child process in pool #%i with PID %i reports as idle", worker->pool->poolnum, (int)worker->pid);
1328 }
1329 moonbr_add_idle_worker(worker);
1330 break;
1331 case MOONBR_STATUS_GOODBYE:
1332 if (moonbr_stat) {
1333 moonbr_log(LOG_INFO, "Child process in pool #%i with PID %i announced termination", worker->pool->poolnum, (int)worker->pid);
1334 }
1335 if (close(worker->controlfd) && errno != EINTR) {
1336 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));
1337 moonbr_terminate_error();
1338 }
1339 worker->controlfd = -1;
1340 moonbr_poll_refresh_needed = 1;
1341 break;
1342 default:
1343 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);
1344 moonbr_terminate_error();
1345 }
1346 }
1348 /* Handles stderr stream from child process */
1349 static void moonbr_read_errorchannel(struct moonbr_worker *worker) {
1350 char staticbuf[MOONBR_MAXERRORLINELEN+1];
1351 char *buf = worker->errorlinebuf;
1352 if (!buf) buf = staticbuf;
1353 {
1354 ssize_t bytes_read;
1355 while (
1356 (bytes_read = read(
1357 worker->errorfd,
1358 buf + worker->errorlinelen,
1359 MOONBR_MAXERRORLINELEN+1 - worker->errorlinelen
1360 )) <= 0
1361 ) {
1362 if (bytes_read == 0 || errno == ECONNRESET) {
1363 if (moonbr_debug) {
1364 moonbr_log(LOG_DEBUG, "Child process in pool #%i with PID %i closed stderr socket", worker->pool->poolnum, (int)worker->pid);
1365 }
1366 if (close(worker->errorfd) && errno != EINTR) {
1367 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));
1368 moonbr_terminate_error();
1369 }
1370 worker->errorfd = -1;
1371 moonbr_poll_refresh_needed = 1;
1372 break;
1373 }
1374 if (errno != EINTR) {
1375 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));
1376 moonbr_terminate_error();
1377 }
1378 }
1379 worker->errorlinelen += bytes_read;
1380 }
1381 {
1382 int i;
1383 for (i=0; i<worker->errorlinelen; i++) {
1384 if (buf[i] == '\n') buf[i] = 0;
1385 if (!buf[i]) {
1386 if (worker->errorlineovf) {
1387 worker->errorlineovf = 0;
1388 } else {
1389 moonbr_log(LOG_WARNING, "Error log from process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, buf);
1390 }
1391 worker->errorlinelen -= i+1;
1392 memmove(buf, buf+i+1, worker->errorlinelen);
1393 i = -1;
1394 }
1395 }
1396 if (i > MOONBR_MAXERRORLINELEN) {
1397 buf[MOONBR_MAXERRORLINELEN] = 0;
1398 if (!worker->errorlineovf) {
1399 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);
1400 }
1401 worker->errorlinelen = 0;
1402 worker->errorlineovf = 1;
1403 }
1404 }
1405 if (!worker->errorlinebuf && worker->errorlinelen) { /* allocate buffer on heap only if necessary */
1406 worker->errorlinebuf = malloc((MOONBR_MAXERRORLINELEN+1) * sizeof(char));
1407 if (!worker->errorlinebuf) {
1408 moonbr_log(LOG_CRIT, "Memory allocation error");
1409 moonbr_terminate_error();
1410 }
1411 memcpy(worker->errorlinebuf, staticbuf, worker->errorlinelen);
1412 }
1413 }
1416 /*** Handler for incoming connections ***/
1418 /* Accepts one or more incoming connections on listener socket and passes it to worker(s) popped from idle queue */
1419 static void moonbr_connect(struct moonbr_pool *pool) {
1420 struct moonbr_listener *listener = moonbr_pop_connected_listener(pool);
1421 struct moonbr_worker *worker;
1422 if (listener->proto == MOONBR_PROTO_MAIN) {
1423 worker = moonbr_pop_idle_worker(pool);
1424 if (moonbr_stat) {
1425 moonbr_log(LOG_INFO, "Dispatching main thread of pool #%i to PID %i", listener->pool->poolnum, (int)worker->pid);
1426 }
1427 worker->main = 1;
1428 moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, -1, listener);
1429 /* do not push listener to queue of idle listeners */
1430 } else if (listener->proto == MOONBR_PROTO_INTERVAL) {
1431 worker = moonbr_pop_idle_worker(pool);
1432 if (moonbr_stat) {
1433 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);
1434 }
1435 worker->restart_interval_listener = listener;
1436 moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, -1, listener);
1437 /* do not push listener to queue of idle listeners yet */
1438 } else {
1439 int peerfd;
1440 do {
1441 #if defined(__linux__) && !defined(_GNU_SOURCE)
1442 peerfd = accept(listener->listenfd, NULL, NULL);
1443 if (peerfd != -1) {
1444 if (fcntl(peerfd, F_SETFD, FD_CLOEXEC) == -1) {
1445 moonbr_log(LOG_ERR, "Error in fcntl() call: %s", strerror(errno));
1446 moonbr_terminate_error();
1447 }
1448 }
1449 #else
1450 peerfd = accept4(listener->listenfd, NULL, NULL, SOCK_CLOEXEC);
1451 #endif
1452 if (peerfd == -1) {
1453 if (errno == EWOULDBLOCK) {
1454 break;
1455 } else if (errno == ECONNABORTED) {
1456 moonbr_log(LOG_WARNING, "Connection aborted before accepting it");
1457 break;
1458 } else if (errno != EINTR) {
1459 moonbr_log(LOG_ERR, "Could not accept socket connection: %s", strerror(errno));
1460 moonbr_terminate_error();
1461 }
1462 } else {
1463 worker = moonbr_pop_idle_worker(pool);
1464 if (moonbr_stat) {
1465 moonbr_log(LOG_INFO, "Dispatching connection for pool #%i to PID %i", listener->pool->poolnum, (int)worker->pid);
1466 }
1467 moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, peerfd, listener);
1468 if (close(peerfd) && errno != EINTR) {
1469 moonbr_log(LOG_ERR, "Could not close incoming socket connection in parent process: %s", strerror(errno));
1470 moonbr_terminate_error();
1471 }
1472 }
1473 } while (pool->first_idle_worker);
1474 moonbr_add_idle_listener(listener);
1475 }
1476 }
1479 /*** Functions to initialize and restart interval timers ***/
1481 /* Initializes all interval timers */
1482 static void moonbr_interval_initialize() {
1483 struct timeval now;
1484 struct moonbr_pool *pool;
1485 moonbr_now(&now);
1486 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1487 int i;
1488 for (i=0; i<pool->listener_count; i++) {
1489 struct moonbr_listener *listener = &pool->listener[i];
1490 if (listener->proto == MOONBR_PROTO_INTERVAL) {
1491 timeradd(
1492 &now,
1493 &listener->type_specific.interval.delay,
1494 &listener->type_specific.interval.wakeup
1495 );
1496 }
1497 }
1498 }
1499 }
1501 /* If necessary, restarts interval timers and queues interval listener as idle after a worker changed status */
1502 static void moonbr_interval_restart(
1503 struct moonbr_worker *worker,
1504 struct timeval *now /* passed to synchronize with moonbr_run() function */
1505 ) {
1506 struct moonbr_listener *listener = worker->restart_interval_listener;
1507 if (listener) {
1508 moonbr_add_idle_listener(listener);
1509 worker->restart_interval_listener = NULL;
1510 if (listener->type_specific.interval.strict) {
1511 timeradd(
1512 &listener->type_specific.interval.wakeup,
1513 &listener->type_specific.interval.delay,
1514 &listener->type_specific.interval.wakeup
1515 );
1516 if (timercmp(&listener->type_specific.interval.wakeup, now, <)) {
1517 listener->type_specific.interval.wakeup = *now;
1518 }
1519 } else {
1520 timeradd(
1521 now,
1522 &listener->type_specific.interval.delay,
1523 &listener->type_specific.interval.wakeup
1524 );
1525 }
1526 }
1527 }
1530 /*** Main loop and helper functions ***/
1532 /* Stores the earliest required wakeup time in 'wait' variable */
1533 static void moonbr_calc_wait(struct timeval *wait, struct timeval *wakeup) {
1534 if (!timerisset(wait) || timercmp(wakeup, wait, <)) *wait = *wakeup;
1535 }
1537 /* Main loop of Moonbridge system (including initialization of signal handlers and polling structures) */
1538 static void moonbr_run(lua_State *L) {
1539 struct timeval now;
1540 struct moonbr_pool *pool;
1541 struct moonbr_worker *worker;
1542 struct moonbr_worker *next_worker; /* needed when worker is removed during iteration of workers */
1543 struct moonbr_listener *listener;
1544 struct moonbr_listener *next_listener; /* needed when listener is removed during iteration of listeners */
1545 int i;
1546 moonbr_poll_init(); /* must be executed before moonbr_signal_init() */
1547 moonbr_signal_init();
1548 moonbr_interval_initialize();
1549 moonbr_pstate = MOONBR_PSTATE_RUNNING;
1550 while (1) {
1551 struct timeval wait = {0, }; /* point in time when premature wakeup of poll() is required */
1552 if (moonbr_cond_interrupt) {
1553 moonbr_log(LOG_WARNING, "Fast shutdown requested");
1554 moonbr_terminate(MOONBR_EXITCODE_GRACEFUL);
1555 }
1556 if (moonbr_cond_terminate) {
1557 moonbr_initiate_shutdown();
1558 moonbr_cond_terminate = 0;
1559 }
1560 moonbr_cond_child = 0; /* must not be reset between moonbr_try_destroy_worker() and poll() */
1561 moonbr_now(&now);
1562 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1563 int terminated_worker_count = 0; /* allows shortcut for new worker creation */
1564 /* terminate idle workers when expired */
1565 if (timerisset(&pool->idle_timeout)) {
1566 while ((worker = pool->first_idle_worker) != NULL) {
1567 if (timercmp(&worker->idle_expiration, &now, >)) break;
1568 moonbr_pop_idle_worker(pool);
1569 moonbr_terminate_idle_worker(worker);
1570 }
1571 }
1572 /* mark listeners as connected when incoming connection is pending */
1573 for (listener=pool->first_idle_listener; listener; listener=next_listener) {
1574 next_listener = listener->next_listener; /* extra variable necessary due to changing list */
1575 if (listener->pollidx != -1) {
1576 if (moonbr_poll_fds[listener->pollidx].revents) {
1577 moonbr_poll_fds[listener->pollidx].revents = 0;
1578 moonbr_remove_idle_listener(listener);
1579 moonbr_add_connected_listener(listener);
1580 }
1581 } else if (
1582 listener->proto != MOONBR_PROTO_INTERVAL ||
1583 !timercmp(&listener->type_specific.interval.wakeup, &now, >)
1584 ) {
1585 moonbr_remove_idle_listener(listener);
1586 moonbr_add_connected_listener(listener);
1587 }
1588 }
1589 /* process input from child processes */
1590 for (i=0; i<moonbr_poll_worker_count; i++) {
1591 if (moonbr_poll_worker_fds[i].revents) {
1592 moonbr_poll_worker_fds[i].revents = 0;
1593 struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[i];
1594 switch (poll_worker->channel) {
1595 case MOONBR_POLL_WORKER_CONTROLCHANNEL:
1596 moonbr_read_controlchannel(poll_worker->worker);
1597 moonbr_interval_restart(poll_worker->worker, &now);
1598 break;
1599 case MOONBR_POLL_WORKER_ERRORCHANNEL:
1600 moonbr_read_errorchannel(poll_worker->worker);
1601 break;
1602 }
1603 }
1604 }
1605 /* collect dead child processes */
1606 for (worker=pool->first_worker; worker; worker=next_worker) {
1607 next_worker = worker->next_worker; /* extra variable necessary due to changing list */
1608 switch (moonbr_try_destroy_worker(worker)) {
1609 case MOONBR_DESTROY_PREPARE:
1610 pool->use_fork_error_wakeup = 1;
1611 break;
1612 case MOONBR_DESTROY_IDLE_OR_ASSIGNED:
1613 terminated_worker_count++;
1614 break;
1615 }
1616 }
1617 if (!moonbr_shutdown_in_progress) {
1618 /* connect listeners with idle workers */
1619 while (pool->first_connected_listener && pool->first_idle_worker) {
1620 moonbr_connect(pool);
1621 }
1622 /* create new worker processes */
1623 while (
1624 pool->total_worker_count < pool->max_fork && (
1625 pool->unassigned_worker_count < pool->pre_fork ||
1626 pool->total_worker_count < pool->min_fork
1627 )
1628 ) {
1629 if (pool->use_fork_error_wakeup) {
1630 if (timercmp(&pool->fork_error_wakeup, &now, >)) {
1631 moonbr_calc_wait(&wait, &pool->fork_error_wakeup);
1632 break;
1633 }
1634 } else {
1635 if (terminated_worker_count) {
1636 terminated_worker_count--;
1637 } else if (timercmp(&pool->fork_wakeup, &now, >)) {
1638 moonbr_calc_wait(&wait, &pool->fork_wakeup);
1639 break;
1640 }
1641 }
1642 if (moonbr_create_worker(pool, L)) {
1643 /* on error, enforce error delay */
1644 timeradd(&now, &pool->fork_error_delay, &pool->fork_error_wakeup);
1645 pool->use_fork_error_wakeup = 1;
1646 moonbr_calc_wait(&wait, &pool->fork_error_wakeup);
1647 break;
1648 } else {
1649 /* normal fork delay on success */
1650 timeradd(&now, &pool->fork_delay, &pool->fork_wakeup);
1651 timeradd(&now, &pool->fork_error_delay, &pool->fork_error_wakeup);
1652 pool->use_fork_error_wakeup = 0; /* gets set later if error occures during preparation */
1653 }
1654 }
1655 /* terminate excessive worker processes */
1656 while (
1657 pool->total_worker_count > pool->min_fork &&
1658 pool->idle_worker_count > pool->pre_fork
1659 ) {
1660 if (timerisset(&pool->exit_wakeup)) {
1661 if (timercmp(&pool->exit_wakeup, &now, >)) {
1662 moonbr_calc_wait(&wait, &pool->exit_wakeup);
1663 break;
1664 }
1665 moonbr_terminate_idle_worker(moonbr_pop_idle_worker(pool));
1666 timeradd(&now, &pool->exit_delay, &pool->exit_wakeup);
1667 } else {
1668 timeradd(&now, &pool->exit_delay, &pool->exit_wakeup);
1669 break;
1670 }
1671 }
1672 if (!(
1673 pool->total_worker_count > pool->min_fork &&
1674 pool->idle_worker_count > pool->pre_fork
1675 )) {
1676 timerclear(&pool->exit_wakeup); /* timer gets restarted later when there are excessive workers */
1677 }
1678 }
1679 /* optionally output worker count stats */
1680 if (moonbr_stat && pool->worker_count_stat) {
1681 pool->worker_count_stat = 0;
1682 moonbr_log(
1683 LOG_INFO,
1684 "Worker count for pool #%i: %i idle, %i assigned, %i total",
1685 pool->poolnum, pool->idle_worker_count,
1686 pool->total_worker_count - pool->unassigned_worker_count,
1687 pool->total_worker_count);
1688 }
1689 /* calculate wakeup time for interval listeners */
1690 for (listener=pool->first_idle_listener; listener; listener=listener->next_listener) {
1691 if (listener->proto == MOONBR_PROTO_INTERVAL) {
1692 moonbr_calc_wait(&wait, &listener->type_specific.interval.wakeup);
1693 }
1694 }
1695 /* calculate wakeup time for idle workers (only first idle worker is significant) */
1696 if (timerisset(&pool->idle_timeout) && pool->first_idle_worker) {
1697 moonbr_calc_wait(&wait, &pool->first_idle_worker->idle_expiration);
1698 }
1699 }
1700 /* terminate idle workers in case of shutdown and check if shutdown is complete */
1701 if (moonbr_shutdown_in_progress) {
1702 int remaining = 0;
1703 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1704 while (pool->idle_worker_count) {
1705 moonbr_terminate_idle_worker(moonbr_pop_idle_worker(pool));
1706 }
1707 if (pool->first_worker) remaining = 1;
1708 }
1709 if (!remaining) {
1710 moonbr_log(LOG_INFO, "All worker threads have terminated");
1711 moonbr_terminate(MOONBR_EXITCODE_GRACEFUL);
1712 }
1713 }
1714 if (moonbr_poll_refresh_needed) moonbr_poll_refresh();
1715 moonbr_cond_poll = 1;
1716 if (!moonbr_cond_child && !moonbr_cond_terminate && !moonbr_cond_interrupt) {
1717 int timeout;
1718 if (timerisset(&wait)) {
1719 if (timercmp(&wait, &now, <)) {
1720 moonbr_log(LOG_CRIT, "Internal error (should not happen): Future is in the past");
1721 moonbr_terminate_error();
1722 }
1723 timersub(&wait, &now, &wait);
1724 timeout = wait.tv_sec * 1000 + wait.tv_usec / 1000;
1725 } else {
1726 timeout = INFTIM;
1727 }
1728 if (moonbr_debug) {
1729 moonbr_log(LOG_DEBUG, "Waiting for I/O");
1730 }
1731 poll(moonbr_poll_fds, moonbr_poll_fds_count, timeout);
1732 } else {
1733 if (moonbr_debug) {
1734 moonbr_log(LOG_DEBUG, "Do not wait for I/O");
1735 }
1736 }
1737 moonbr_cond_poll = 0;
1738 moonbr_poll_reset_signal();
1739 }
1740 }
1743 /*** Lua interface ***/
1745 static int moonbr_lua_panic(lua_State *L) {
1746 const char *errmsg;
1747 errmsg = lua_tostring(L, -1);
1748 if (!errmsg) {
1749 if (lua_isnoneornil(L, -1)) errmsg = "(error message is nil)";
1750 else errmsg = "(error message is not a string)";
1751 }
1752 if (moonbr_pstate == MOONBR_PSTATE_FORKED) {
1753 fprintf(stderr, "Uncaught Lua error: %s\n", errmsg);
1754 exit(1);
1755 } else {
1756 moonbr_log(LOG_CRIT, "Uncaught Lua error: %s", errmsg);
1757 moonbr_terminate_error();
1758 }
1759 return 0;
1760 }
1762 static int moonbr_addtraceback(lua_State *L) {
1763 luaL_traceback(L, L, luaL_tolstring(L, 1, NULL), 1);
1764 return 1;
1765 }
1767 /* Memory allocator that allows limiting memory consumption */
1768 static void *moonbr_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
1769 (void)ud; /* not used */
1770 if (nsize == 0) {
1771 if (ptr) {
1772 moonbr_memory_usage -= osize;
1773 free(ptr);
1774 }
1775 return NULL;
1776 } else if (ptr) {
1777 if (
1778 moonbr_memory_limit &&
1779 nsize > osize &&
1780 moonbr_memory_usage + (nsize - osize) > moonbr_memory_limit
1781 ) {
1782 return NULL;
1783 } else {
1784 ptr = realloc(ptr, nsize);
1785 if (ptr) moonbr_memory_usage += nsize - osize;
1786 }
1787 } else {
1788 if (
1789 moonbr_memory_limit &&
1790 moonbr_memory_usage + nsize > moonbr_memory_limit
1791 ) {
1792 return NULL;
1793 } else {
1794 ptr = realloc(ptr, nsize);
1795 if (ptr) moonbr_memory_usage += nsize;
1796 }
1797 }
1798 return ptr;
1799 }
1801 static int moonbr_lua_tonatural(lua_State *L, int idx) {
1802 int isnum;
1803 lua_Number n;
1804 n = lua_tonumberx(L, idx, &isnum);
1805 if (isnum && n>=0 && n<INT_MAX && (lua_Number)(int)n == n) return n;
1806 else return -1;
1807 }
1809 static int moonbr_lua_totimeval(lua_State *L, int idx, struct timeval *value) {
1810 int isnum;
1811 lua_Number n;
1812 n = lua_tonumberx(L, idx, &isnum);
1813 if (isnum && n>=0 && n<=100000000) {
1814 value->tv_sec = n;
1815 value->tv_usec = 1e6 * (n - value->tv_sec);
1816 return 1;
1817 } else {
1818 return 0;
1819 }
1820 }
1822 static int moonbr_timeout(lua_State *L) {
1823 struct itimerval oldval;
1824 if (lua_isnoneornil(L, 1) && lua_isnoneornil(L, 2)) {
1825 getitimer(ITIMER_REAL, &oldval);
1826 } else {
1827 struct itimerval newval = {};
1828 timerclear(&newval.it_interval);
1829 timerclear(&newval.it_value);
1830 if (lua_toboolean(L, 1)) {
1831 luaL_argcheck(
1832 L, moonbr_lua_totimeval(L, 1, &newval.it_value), 1,
1833 "interval in seconds expected"
1834 );
1835 }
1836 if (lua_isnoneornil(L, 2)) {
1837 if (setitimer(ITIMER_REAL, &newval, &oldval)) {
1838 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1839 moonbr_terminate_error();
1840 }
1841 } else {
1842 getitimer(ITIMER_REAL, &oldval);
1843 if (!timerisset(&oldval.it_value)) {
1844 if (setitimer(ITIMER_REAL, &newval, NULL)) {
1845 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1846 moonbr_terminate_error();
1847 }
1848 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
1849 timerclear(&newval.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 } else if (timercmp(&newval.it_value, &oldval.it_value, <)) {
1855 struct itimerval remval;
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 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
1861 getitimer(ITIMER_REAL, &remval);
1862 timersub(&oldval.it_value, &newval.it_value, &newval.it_value);
1863 timeradd(&newval.it_value, &remval.it_value, &newval.it_value);
1864 if (setitimer(ITIMER_REAL, &newval, NULL)) {
1865 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1866 moonbr_terminate_error();
1867 }
1868 } else {
1869 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
1870 }
1871 return lua_gettop(L) - 1;
1872 }
1873 }
1874 lua_pushnumber(L, oldval.it_value.tv_sec + 1e-6 * oldval.it_value.tv_usec);
1875 return 1;
1876 }
1878 #define moonbr_listen_init_pool_forkoption(luaname, cname, defval) { \
1879 lua_getfield(L, 2, luaname); \
1880 pool->cname = lua_isnil(L, -1) ? (defval) : moonbr_lua_tonatural(L, -1); \
1881 } while(0)
1883 #define moonbr_listen_init_pool_timeoption(luaname, cname, defval, defvalu) ( \
1884 lua_getfield(L, 2, luaname), \
1885 lua_isnil(L, -1) ? ( \
1886 pool->cname.tv_sec = (defval), pool->cname.tv_usec = (defvalu), \
1887 1 \
1888 ) : ( \
1889 (lua_isboolean(L, -1) && !lua_toboolean(L, -1)) ? ( \
1890 pool->cname.tv_sec = 0, pool->cname.tv_usec = 0, \
1891 1 \
1892 ) : ( \
1893 moonbr_lua_totimeval(L, -1, &pool->cname) \
1894 ) \
1895 ) \
1896 )
1898 static int moonbr_listen_init_pool(lua_State *L) {
1899 struct moonbr_pool *pool;
1900 const char *proto;
1901 int i;
1902 int dynamic = 0; /* nonzero = listeners exist which require dynamic worker creation */
1903 pool = lua_touserdata(L, 1);
1904 for (i=0; i<pool->listener_count; i++) {
1905 struct moonbr_listener *listener = &pool->listener[i];
1906 lua_settop(L, 2);
1907 #if LUA_VERSION_NUM >= 503
1908 lua_geti(L, 2, i+1);
1909 #else
1910 lua_pushinteger(L, i+1);
1911 lua_gettable(L, 2);
1912 #endif
1913 lua_getfield(L, 3, "proto");
1914 proto = lua_tostring(L, -1);
1915 if (proto && !strcmp(proto, "main")) {
1916 listener->proto = MOONBR_PROTO_MAIN;
1917 } else if (proto && !strcmp(proto, "interval")) {
1918 dynamic = 1;
1919 listener->proto = MOONBR_PROTO_INTERVAL;
1920 lua_getfield(L, 3, "name");
1921 {
1922 const char *name = lua_tostring(L, -1);
1923 if (name) {
1924 char *name_dup = strdup(name);
1925 if (!name_dup) {
1926 moonbr_log(LOG_CRIT, "Memory allocation_error");
1927 moonbr_terminate_error();
1928 }
1929 listener->type_specific.interval.name = name_dup;
1930 }
1931 }
1932 lua_getfield(L, 3, "delay");
1933 if (
1934 !moonbr_lua_totimeval(L, -1, &listener->type_specific.interval.delay) ||
1935 !timerisset(&listener->type_specific.interval.delay)
1936 ) {
1937 luaL_error(L, "No valid interval delay specified; use listen{{proto=\"interval\", delay=...}, ...}");
1938 }
1939 lua_getfield(L, 3, "strict");
1940 if (!lua_isnil(L, -1)) {
1941 if (lua_isboolean(L, -1)) {
1942 if (lua_toboolean(L, -1)) listener->type_specific.interval.strict = 1;
1943 } else {
1944 luaL_error(L, "Option \"strict\" must be a boolean if set; use listen{{proto=\"interval\", strict=true, ...}, ...}");
1945 }
1946 }
1947 } else if (proto && !strcmp(proto, "local")) {
1948 const char *path;
1949 const int path_maxlen = (
1950 sizeof(listener->type_specific.socket.addr.addr_un) -
1951 ((void *)listener->type_specific.socket.addr.addr_un.sun_path - (void *)&listener->type_specific.socket.addr.addr_un)
1952 ) - 1; /* one byte for termination */
1953 dynamic = 1;
1954 listener->proto = MOONBR_PROTO_LOCAL;
1955 lua_getfield(L, 3, "path");
1956 path = lua_tostring(L, -1);
1957 if (!path) {
1958 luaL_error(L, "No valid path specified for local socket; use listen{{proto=\"local\", path=...}, ...}");
1959 }
1960 if (strlen(path) > path_maxlen) {
1961 luaL_error(L, "Path name for local socket exceeded maximum length of %i characters", path_maxlen);
1962 }
1963 strcpy(listener->type_specific.socket.addr.addr_un.sun_path, path);
1964 } else if (proto && !strcmp(proto, "tcp")) {
1965 const char *host, *port;
1966 struct addrinfo hints = { 0, };
1967 struct addrinfo *res, *addrinfo;
1968 int errcode;
1969 const char *ip;
1970 dynamic = 1;
1971 lua_getfield(L, 3, "host");
1972 host = lua_isnil(L, -1) ? "::" : lua_tostring(L, -1);
1973 if (!host) {
1974 luaL_error(L, "No host specified; use listen{{proto=\"tcp\", host=...}, ...}");
1975 }
1976 lua_getfield(L, 3, "port");
1977 port = lua_tostring(L, -1);
1978 if (!port) {
1979 luaL_error(L, "No port specified; use listen{{proto=\"tcp\", host=...}, ...}");
1980 }
1981 hints.ai_family = AF_UNSPEC;
1982 hints.ai_socktype = SOCK_STREAM;
1983 hints.ai_protocol = IPPROTO_TCP;
1984 hints.ai_flags = AI_ADDRCONFIG | AI_PASSIVE;
1985 errcode = getaddrinfo(host, port, &hints, &res);
1986 if (errcode) {
1987 freeaddrinfo(res);
1988 if (errcode == EAI_SYSTEM) {
1989 char errmsg[MOONBR_MAXSTRERRORLEN] = MOONBR_STRERROR_R_MSG;
1990 strerror_r(errno, errmsg, MOONBR_MAXSTRERRORLEN); /* use thread-safe call in case child created threads */
1991 luaL_error(L, "Could not resolve host: %s: %s", gai_strerror(errcode), errmsg);
1992 } else {
1993 luaL_error(L, "Could not resolve host: %s", gai_strerror(errcode));
1994 }
1995 }
1996 for (addrinfo=res; addrinfo; addrinfo=addrinfo->ai_next) {
1997 if (addrinfo->ai_family == AF_INET6) goto moonbr_listen_init_pool_found;
1998 }
1999 for (addrinfo=res; addrinfo; addrinfo=addrinfo->ai_next) {
2000 if (addrinfo->ai_family == AF_INET) goto moonbr_listen_init_pool_found;
2001 }
2002 addrinfo = res;
2003 moonbr_listen_init_pool_found:
2004 if (addrinfo->ai_addrlen > sizeof(listener->type_specific.socket.addr)) {
2005 moonbr_log(LOG_CRIT, "Size of ai_addrlen is unexpectedly big (should not happen)");
2006 moonbr_terminate_error();
2007 }
2008 memcpy(&listener->type_specific.socket.addr, addrinfo->ai_addr, addrinfo->ai_addrlen);
2009 listener->type_specific.socket.addrlen = addrinfo->ai_addrlen;
2010 switch (addrinfo->ai_family) {
2011 case AF_INET6:
2012 ip = inet_ntop(
2013 addrinfo->ai_family,
2014 &((struct sockaddr_in6 *)addrinfo->ai_addr)->sin6_addr,
2015 listener->proto_specific.tcp.ip,
2016 INET6_ADDRSTRLEN
2017 );
2018 if (!ip) {
2019 moonbr_log(LOG_CRIT, "System error in inet_ntop call: %s", strerror(errno));
2020 moonbr_terminate_error();
2021 }
2022 listener->proto_specific.tcp.port = ntohs(((struct sockaddr_in6 *)addrinfo->ai_addr)->sin6_port);
2023 break;
2024 case AF_INET:
2025 ip = inet_ntop(
2026 addrinfo->ai_family,
2027 &((struct sockaddr_in *)addrinfo->ai_addr)->sin_addr,
2028 listener->proto_specific.tcp.ip,
2029 INET6_ADDRSTRLEN
2030 );
2031 if (!ip) {
2032 moonbr_log(LOG_CRIT, "System error in inet_ntop call: %s", strerror(errno));
2033 moonbr_terminate_error();
2034 }
2035 listener->proto_specific.tcp.port = ntohs(((struct sockaddr_in *)addrinfo->ai_addr)->sin_port);
2036 break;
2037 default:
2038 strcpy(listener->proto_specific.tcp.ip, "unknown");
2039 listener->proto_specific.tcp.port = 0;
2040 }
2041 listener->proto = MOONBR_PROTO_TCP;
2042 } else if (proto) {
2043 luaL_error(L, "Unknown protocol \"%s\"", proto);
2044 } else {
2045 luaL_error(L, "No valid protocol specified; use listen{{proto=..., ...}, ...}");
2046 }
2047 }
2048 lua_settop(L, 2);
2049 if (dynamic) {
2050 moonbr_listen_init_pool_forkoption("pre_fork", pre_fork, 1);
2051 moonbr_listen_init_pool_forkoption("min_fork", min_fork, pool->pre_fork > 2 ? pool->pre_fork : 2);
2052 moonbr_listen_init_pool_forkoption("max_fork", max_fork, pool->min_fork > 16 ? pool->min_fork : 16);
2053 if (!moonbr_listen_init_pool_timeoption("fork_delay", fork_delay, 0, 250000)) {
2054 luaL_error(L, "Option \"fork_delay\" is expected to be a non-negative number");
2055 }
2056 if (!moonbr_listen_init_pool_timeoption("fork_error_delay", fork_error_delay, 2, 0)) {
2057 luaL_error(L, "Option \"fork_error_delay\" is expected to be a non-negative number");
2058 }
2059 if (!moonbr_listen_init_pool_timeoption("exit_delay", exit_delay, 60, 0)) {
2060 luaL_error(L, "Option \"exit_delay\" is expected to be a non-negative number");
2061 }
2062 if (timercmp(&pool->fork_error_delay, &pool->fork_delay, <)) {
2063 pool->fork_error_delay = pool->fork_delay;
2064 }
2065 if (!moonbr_listen_init_pool_timeoption("idle_timeout", idle_timeout, 0, 0)) {
2066 luaL_error(L, "Option \"idle_timeout\" is expected to be a non-negative number");
2067 }
2068 } else {
2069 pool->pre_fork = 0;
2070 pool->min_fork = pool->listener_count;
2071 pool->max_fork = pool->listener_count;
2072 }
2073 lua_getfield(L, 2, "memory_limit");
2074 if (!lua_isnil(L, -1)) {
2075 int isnum;
2076 lua_Number n;
2077 n = lua_tonumberx(L, -1, &isnum);
2078 if (n < 0 || !isnum) {
2079 luaL_error(L, "Option \"memory_limit\" is expected to be a non-negative number");
2080 }
2081 pool->memory_limit = n;
2082 }
2083 lua_settop(L, 2);
2084 lua_getfield(L, 2, "prepare");
2085 if (!lua_isnil(L, -1) && !lua_isfunction(L, -1)) {
2086 luaL_error(L, "Option \"prepare\" must be nil or a function");
2087 }
2088 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
2089 lua_getfield(L, 2, "connect");
2090 if (!lua_isfunction(L, -1)) {
2091 luaL_error(L, "Option \"connect\" must be a function; use listen{{...}, {...}, connect=function(socket) ... end, ...}");
2092 }
2093 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
2094 lua_getfield(L, 2, "finish");
2095 if (!lua_isnil(L, -1) && !lua_isfunction(L, -1)) {
2096 luaL_error(L, "Option \"finish\" must be nil or a function");
2097 }
2098 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
2099 return 0;
2100 }
2102 static int moonbr_listen(lua_State *L) {
2103 struct moonbr_pool *pool;
2104 lua_Integer listener_count;
2105 if (moonbr_booted) luaL_error(L, "Moonbridge bootup is already complete");
2106 luaL_checktype(L, 1, LUA_TTABLE);
2107 listener_count = luaL_len(L, 1);
2108 if (!listener_count) luaL_error(L, "No listen ports specified; use listen{{proto=..., port=...},...}");
2109 if (listener_count > 100) luaL_error(L, "Too many listeners");
2110 pool = moonbr_create_pool(listener_count);
2111 lua_pushcfunction(L, moonbr_listen_init_pool);
2112 lua_pushlightuserdata(L, pool);
2113 lua_pushvalue(L, 1);
2114 if (lua_pcall(L, 2, 0, 0)) goto moonbr_listen_error;
2115 {
2116 int i;
2117 i = moonbr_start_pool(pool);
2118 if (i >= 0) {
2119 lua_pushfstring(L, "Could not initialize listener #%d: %s", i+1, strerror(errno));
2120 moonbr_listen_error:
2121 moonbr_destroy_pool(pool);
2122 lua_pushnil(L);
2123 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
2124 lua_pushnil(L);
2125 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
2126 lua_pushnil(L);
2127 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
2128 lua_error(L);
2129 }
2130 }
2131 return 0;
2132 }
2135 /*** Function to modify Lua's library path and/or cpath ***/
2137 #if defined(MOONBR_LUA_PATH) || defined(MOONBR_LUA_CPATH)
2138 static void moonbr_modify_path(lua_State *L, char *key, char *value) {
2139 int stackbase;
2140 stackbase = lua_gettop(L);
2141 lua_getglobal(L, "package");
2142 lua_getfield(L, stackbase+1, key);
2143 {
2144 const char *current_str;
2145 size_t current_strlen;
2146 luaL_Buffer buf;
2147 current_str = lua_tolstring(L, stackbase+2, ¤t_strlen);
2148 luaL_buffinit(L, &buf);
2149 if (current_str) {
2150 lua_pushvalue(L, stackbase+2);
2151 luaL_addvalue(&buf);
2152 if (current_strlen && current_str[current_strlen-1] != ';') {
2153 luaL_addchar(&buf, ';');
2154 }
2155 }
2156 luaL_addstring(&buf, value);
2157 luaL_pushresult(&buf);
2158 }
2159 lua_setfield(L, stackbase+1, key);
2160 lua_settop(L, stackbase);
2161 }
2162 #endif
2165 /*** Main function and command line invokation ***/
2167 static void moonbr_usage(int err, const char *cmd) {
2168 FILE *out;
2169 out = err ? stderr : stdout;
2170 if (!cmd) cmd = "moonbridge";
2171 fprintf(out, "Get this help message: %s {-h|--help}\n", cmd);
2172 fprintf(out, "Usage: %s \\\n", cmd);
2173 fprintf(out, " [-b|--background] \\\n");
2174 fprintf(out, " [-d|--debug] \\\n");
2175 fprintf(out, " [-f|--logfacility {DAEMON|USER|0|1|...|7}] \\\n");
2176 fprintf(out, " [-i|--logident <syslog ident> \\\n");
2177 fprintf(out, " [-l|--logfile <logfile>] \\\n");
2178 fprintf(out, " [-p|--pidfile <pidfile>] \\\n");
2179 fprintf(out, " [-s|--stats] \\\n");
2180 fprintf(out, " -- <Lua script> [<cmdline options for Lua script>]\n");
2181 exit(err);
2182 }
2184 #define moonbr_usage_error() moonbr_usage(MOONBR_EXITCODE_CMDLINEERROR, argc ? argv[0] : NULL)
2186 int main(int argc, char **argv) {
2187 {
2188 int daemonize = 0;
2189 int log_facility = LOG_USER;
2190 const char *log_ident = "moonbridge";
2191 const char *log_filename = NULL;
2192 const char *pid_filename = NULL;
2193 int option;
2194 struct option longopts[] = {
2195 { "background", no_argument, NULL, 'b' },
2196 { "debug", no_argument, NULL, 'd' },
2197 { "logfacility", required_argument, NULL, 'f' },
2198 { "help", no_argument, NULL, 'h' },
2199 { "logident", required_argument, NULL, 'i' },
2200 { "logfile", required_argument, NULL, 'l' },
2201 { "pidfile", required_argument, NULL, 'p' },
2202 { "stats", no_argument, NULL, 's' },
2203 { NULL, 0, NULL, 0 }
2204 };
2205 while ((option = getopt_long(argc, argv, "bdf:hi:l:p:s", longopts, NULL)) != -1) {
2206 switch (option) {
2207 case 'b':
2208 daemonize = 1;
2209 break;
2210 case 'd':
2211 moonbr_debug = 1;
2212 moonbr_stat = 1;
2213 break;
2214 case 'f':
2215 if (!strcmp(optarg, "DAEMON")) {
2216 log_facility = LOG_DAEMON;
2217 } else if (!strcmp(optarg, "USER")) {
2218 log_facility = LOG_USER;
2219 } else if (!strcmp(optarg, "0")) {
2220 log_facility = LOG_LOCAL0;
2221 } else if (!strcmp(optarg, "1")) {
2222 log_facility = LOG_LOCAL1;
2223 } else if (!strcmp(optarg, "2")) {
2224 log_facility = LOG_LOCAL2;
2225 } else if (!strcmp(optarg, "3")) {
2226 log_facility = LOG_LOCAL3;
2227 } else if (!strcmp(optarg, "4")) {
2228 log_facility = LOG_LOCAL4;
2229 } else if (!strcmp(optarg, "5")) {
2230 log_facility = LOG_LOCAL5;
2231 } else if (!strcmp(optarg, "6")) {
2232 log_facility = LOG_LOCAL6;
2233 } else if (!strcmp(optarg, "7")) {
2234 log_facility = LOG_LOCAL7;
2235 } else {
2236 moonbr_usage_error();
2237 }
2238 moonbr_use_syslog = 1;
2239 break;
2240 case 'h':
2241 moonbr_usage(MOONBR_EXITCODE_GRACEFUL, argv[0]);
2242 break;
2243 case 'i':
2244 log_ident = optarg;
2245 moonbr_use_syslog = 1;
2246 break;
2247 case 'l':
2248 log_filename = optarg;
2249 break;
2250 case 'p':
2251 pid_filename = optarg;
2252 break;
2253 case 's':
2254 moonbr_stat = 1;
2255 break;
2256 default:
2257 moonbr_usage_error();
2258 }
2259 }
2260 if (argc - optind < 1) moonbr_usage_error();
2261 if (pid_filename) {
2262 pid_t otherpid;
2263 while ((moonbr_pidfh = pidfile_open(pid_filename, 0644, &otherpid)) == NULL) {
2264 if (errno == EEXIST) {
2265 if (otherpid == -1) {
2266 fprintf(stderr, "PID file \"%s\" is already locked\n", pid_filename);
2267 } else {
2268 fprintf(stderr, "PID file \"%s\" is already locked by process with PID: %i\n", pid_filename, (int)otherpid);
2269 }
2270 exit(MOONBR_EXITCODE_ALREADYRUNNING);
2271 } else if (errno != EINTR) {
2272 fprintf(stderr, "Could not write PID file \"%s\": %s\n", pid_filename, strerror(errno));
2273 exit(MOONBR_EXITCODE_STARTUPERROR);
2274 }
2275 }
2276 }
2277 if (log_filename) {
2278 int logfd;
2279 while (
2280 ( logfd = flopen(
2281 log_filename,
2282 O_WRONLY|O_NONBLOCK|O_CREAT|O_APPEND|O_CLOEXEC,
2283 0640
2284 )
2285 ) < 0
2286 ) {
2287 if (errno == EWOULDBLOCK) {
2288 fprintf(stderr, "Logfile \"%s\" is locked\n", log_filename);
2289 exit(MOONBR_EXITCODE_ALREADYRUNNING);
2290 } else if (errno != EINTR) {
2291 fprintf(stderr, "Could not open logfile \"%s\": %s\n", log_filename, strerror(errno));
2292 exit(MOONBR_EXITCODE_STARTUPERROR);
2293 }
2294 }
2295 moonbr_logfile = fdopen(logfd, "a");
2296 if (!moonbr_logfile) {
2297 fprintf(stderr, "Could not open write stream to logfile \"%s\": %s\n", log_filename, strerror(errno));
2298 exit(MOONBR_EXITCODE_STARTUPERROR);
2299 }
2300 }
2301 if (daemonize == 0 && !moonbr_logfile) moonbr_logfile = stderr;
2302 if (moonbr_logfile) setlinebuf(moonbr_logfile);
2303 else moonbr_use_syslog = 1;
2304 if (moonbr_use_syslog) openlog(log_ident, LOG_NDELAY | LOG_PID, log_facility);
2305 if (daemonize) {
2306 if (daemon(1, 0)) {
2307 moonbr_log(LOG_ERR, "Could not daemonize moonbridge process");
2308 moonbr_terminate_error();
2309 }
2310 }
2311 }
2312 moonbr_log(LOG_NOTICE, "Starting moonbridge server");
2313 if (moonbr_pidfh && pidfile_write(moonbr_pidfh)) {
2314 moonbr_log(LOG_ERR, "Could not write pidfile (after locking)");
2315 }
2316 {
2317 lua_State *L;
2318 L = lua_newstate(moonbr_alloc, NULL);
2319 if (!L) {
2320 moonbr_log(LOG_CRIT, "Could not initialize Lua state");
2321 moonbr_terminate_error();
2322 }
2323 lua_atpanic(L, moonbr_lua_panic);
2324 lua_pushliteral(L, MOONBR_VERSION_STRING);
2325 lua_setglobal(L, "_MOONBRIDGE_VERSION");
2326 luaL_openlibs(L);
2327 luaL_requiref(L, "moonbridge_io", luaopen_moonbridge_io, 1);
2328 lua_pop(L, 1);
2329 #ifdef MOONBR_LUA_PATH
2330 moonbr_modify_path(L, "path", MOONBR_LUA_PATH);
2331 #endif
2332 #ifdef MOONBR_LUA_CPATH
2333 moonbr_modify_path(L, "cpath", MOONBR_LUA_CPATH);
2334 #endif
2335 lua_pushcfunction(L, moonbr_timeout);
2336 lua_setglobal(L, "timeout");
2337 lua_pushcfunction(L, moonbr_listen);
2338 lua_setglobal(L, "listen");
2339 lua_pushcfunction(L, moonbr_addtraceback); /* on stack position 1 */
2340 moonbr_log(LOG_INFO, "Loading \"%s\"", argv[optind]);
2341 if (luaL_loadfile(L, argv[optind])) {
2342 moonbr_log(LOG_ERR, "Error while loading \"%s\": %s", argv[optind], lua_tostring(L, -1));
2343 moonbr_terminate_error();
2344 }
2345 { int i; for (i=optind+1; i<argc; i++) lua_pushstring(L, argv[i]); }
2346 if (lua_pcall(L, argc-(optind+1), 0, 1)) {
2347 moonbr_log(LOG_ERR, "Error while executing \"%s\": %s", argv[optind], lua_tostring(L, -1));
2348 moonbr_terminate_error();
2349 }
2350 if (!moonbr_first_pool) {
2351 moonbr_log(LOG_WARNING, "No listener initialized.");
2352 moonbr_terminate_error();
2353 }
2354 lua_getglobal(L, "listen");
2355 lua_pushcfunction(L, moonbr_listen);
2356 if (lua_compare(L, -2, -1, LUA_OPEQ)) {
2357 lua_pushnil(L);
2358 lua_setglobal(L, "listen");
2359 }
2360 lua_settop(L, 1);
2361 lua_gc(L, LUA_GCCOLLECT, 0); /* collect garbage before forking later */
2362 moonbr_run(L);
2363 }
2364 return 0;
2365 }