moonbridge
view moonbridge.c @ 211:a3d569d3e85d
Avoid use of asprintf function
| author | jbe |
|---|---|
| date | Mon Jun 22 21:26:33 2015 +0200 (2015-06-22) |
| parents | 05fd82e3cfb7 |
| children | 453b7d1a7944 |
line source
2 /*** Version ***/
3 #define MOONBR_VERSION_STRING "0.4.0"
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 #if defined(__linux__)
21 #define _GNU_SOURCE
22 #endif
23 #include <stdlib.h>
24 #include <stdint.h>
25 #include <string.h>
26 #include <errno.h>
27 #include <unistd.h>
28 #include <signal.h>
29 #include <sys/wait.h>
30 #include <sys/resource.h>
31 #include <poll.h>
32 #include <time.h>
33 #include <sys/time.h>
34 #include <sys/socket.h>
35 #include <sys/un.h>
36 #include <netinet/in.h>
37 #include <netdb.h>
38 #include <arpa/inet.h>
39 #include <getopt.h>
40 #include <sys/file.h>
41 #include <syslog.h>
42 #if defined(__FreeBSD__) || __has_include(<libutil.h>)
43 #include <libutil.h>
44 #endif
45 #if defined(__linux__) || __has_include(<bsd/libutil.h>)
46 #include <bsd/libutil.h>
47 #endif
48 #if defined(__linux__) || __has_include(<bsd/unistd.h>)
49 #include <bsd/unistd.h>
50 #endif
53 /*** Fallback definitions for missing constants on some platforms ***/
55 /* INFTIM is used as timeout parameter for poll() */
56 #ifndef INFTIM
57 #define INFTIM -1
58 #endif
61 /*** Include directives for Lua ***/
63 #include <lua.h>
64 #include <lauxlib.h>
65 #include <lualib.h>
68 /*** Include directive for moonbridge_io library ***/
70 #include "moonbridge_io.h"
73 /*** Constants ***/
75 /* Backlog option for listen() call */
76 #define MOONBR_LISTEN_BACKLOG 1024
78 /* Maximum length of a timestamp used for strftime() */
79 #define MOONBR_LOG_MAXTIMELEN 40
81 /* Maximum length of a log message */
82 #define MOONBR_LOG_MAXMSGLEN 4095
84 /* Exitcodes passed to exit() call */
85 #define MOONBR_EXITCODE_GRACEFUL 0
86 #define MOONBR_EXITCODE_CMDLINEERROR 1
87 #define MOONBR_EXITCODE_ALREADYRUNNING 2
88 #define MOONBR_EXITCODE_STARTUPERROR 3
89 #define MOONBR_EXITCODE_RUNTIMEERROR 4
91 /* Maximum length of a line sent to stderr by child processes */
92 #define MOONBR_MAXERRORLINELEN 1024
94 /* Maximum length of an error string returned by strerror() */
95 #define MOONBR_MAXSTRERRORLEN 80
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);
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];
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 {
1147 pid_t pgrp = getpgrp();
1148 moonbr_log(LOG_INFO, "Sending SIGUSR1 to all processes in group %i", (int)pgrp);
1149 if (killpg(pgrp, SIGUSR1)) {
1150 moonbr_log(LOG_WARNING, "Error while sending SIGUSR1 to own process group: %s", strerror(errno));
1151 }
1152 }
1153 }
1156 /*** Functions to handle previously created 'struct moonbr_worker' structures ***/
1158 #define moonbr_try_destroy_worker_stat(str, field) \
1159 moonbr_log(LOG_INFO, "Resource usage in pool #%i for PID %i: " str " %li", worker->pool->poolnum, (int)worker->pid, (long)childusage.field);
1161 /* Destroys a worker structure if socket connections have been closed and child process has terminated */
1162 static int moonbr_try_destroy_worker(struct moonbr_worker *worker) {
1163 if (worker->controlfd != -1 || worker->errorfd != -1) return MOONBR_DESTROY_NONE;
1164 {
1165 int childstatus;
1166 struct rusage childusage;
1167 {
1168 pid_t waitedpid;
1169 while (
1170 (waitedpid = wait4(worker->pid, &childstatus, WNOHANG, &childusage)) == -1
1171 ) {
1172 if (errno != EINTR) {
1173 moonbr_log(LOG_CRIT, "Error in wait4() call: %s", strerror(errno));
1174 moonbr_terminate_error();
1175 }
1176 }
1177 if (!waitedpid) return 0; /* return 0 if worker couldn't be destroyed */
1178 if (waitedpid != worker->pid) {
1179 moonbr_log(LOG_CRIT, "Wrong PID returned by wait4() call");
1180 moonbr_terminate_error();
1181 }
1182 }
1183 if (WIFEXITED(childstatus)) {
1184 if (WEXITSTATUS(childstatus) || moonbr_stat) {
1185 moonbr_log(
1186 WEXITSTATUS(childstatus) ? LOG_WARNING : LOG_INFO,
1187 "Child process in pool #%i with PID %i returned with exit code %i", worker->pool->poolnum, (int)worker->pid, WEXITSTATUS(childstatus)
1188 );
1189 }
1190 } else if (WIFSIGNALED(childstatus)) {
1191 if (WCOREDUMP(childstatus)) {
1192 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));
1193 } else if (WTERMSIG(childstatus) == SIGALRM) {
1194 moonbr_log(LOG_WARNING, "Child process in pool #%i with PID %i exited prematurely due to timeout", worker->pool->poolnum, (int)worker->pid);
1195 } else {
1196 moonbr_log(LOG_ERR, "Child process in pool #%i with PID %i died from signal %i", worker->pool->poolnum, (int)worker->pid, WTERMSIG(childstatus));
1197 }
1198 } else {
1199 moonbr_log(LOG_CRIT, "Illegal exit status from child process in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
1200 moonbr_terminate_error();
1201 }
1202 if (moonbr_stat) {
1203 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));
1204 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));
1205 moonbr_try_destroy_worker_stat("max resident set size", ru_maxrss);
1206 moonbr_try_destroy_worker_stat("integral shared memory size", ru_ixrss);
1207 moonbr_try_destroy_worker_stat("integral unshared data", ru_idrss);
1208 moonbr_try_destroy_worker_stat("integral unshared stack", ru_isrss);
1209 moonbr_try_destroy_worker_stat("page replaims", ru_minflt);
1210 moonbr_try_destroy_worker_stat("page faults", ru_majflt);
1211 moonbr_try_destroy_worker_stat("swaps", ru_nswap);
1212 moonbr_try_destroy_worker_stat("block input operations", ru_inblock);
1213 moonbr_try_destroy_worker_stat("block output operations", ru_oublock);
1214 moonbr_try_destroy_worker_stat("messages sent", ru_msgsnd);
1215 moonbr_try_destroy_worker_stat("messages received", ru_msgrcv);
1216 moonbr_try_destroy_worker_stat("signals received", ru_nsignals);
1217 moonbr_try_destroy_worker_stat("voluntary context switches", ru_nvcsw);
1218 moonbr_try_destroy_worker_stat("involuntary context switches", ru_nivcsw);
1219 }
1220 }
1221 {
1222 int retval = (
1223 (worker->idle || worker->assigned) ?
1224 MOONBR_DESTROY_IDLE_OR_ASSIGNED :
1225 MOONBR_DESTROY_PREPARE
1226 );
1227 if (worker->main) moonbr_initiate_shutdown();
1228 if (worker->prev_worker) worker->prev_worker->next_worker = worker->next_worker;
1229 else worker->pool->first_worker = worker->next_worker;
1230 if (worker->next_worker) worker->next_worker->prev_worker = worker->prev_worker;
1231 else worker->pool->last_worker = worker->prev_worker;
1232 if (worker->idle) {
1233 if (worker->prev_idle_worker) worker->prev_idle_worker->next_idle_worker = worker->next_idle_worker;
1234 else worker->pool->first_idle_worker = worker->next_idle_worker;
1235 if (worker->next_idle_worker) worker->next_idle_worker->prev_idle_worker = worker->prev_idle_worker;
1236 else worker->pool->last_idle_worker = worker->prev_idle_worker;
1237 worker->pool->idle_worker_count--;
1238 }
1239 if (!worker->assigned) worker->pool->unassigned_worker_count--;
1240 worker->pool->total_worker_count--;
1241 worker->pool->worker_count_stat = 1;
1242 if (worker->errorlinebuf) free(worker->errorlinebuf);
1243 free(worker);
1244 return retval;
1245 }
1246 }
1248 /* Marks a worker as idle and stores it in a queue, optionally setting 'idle_expiration' value */
1249 static void moonbr_add_idle_worker(struct moonbr_worker *worker) {
1250 worker->prev_idle_worker = worker->pool->last_idle_worker;
1251 if (worker->prev_idle_worker) worker->prev_idle_worker->next_idle_worker = worker;
1252 else worker->pool->first_idle_worker = worker;
1253 worker->pool->last_idle_worker = worker;
1254 worker->idle = 1;
1255 worker->pool->idle_worker_count++;
1256 if (worker->assigned) {
1257 worker->assigned = 0;
1258 worker->pool->unassigned_worker_count++;
1259 }
1260 worker->pool->worker_count_stat = 1;
1261 if (timerisset(&worker->pool->idle_timeout)) {
1262 struct timeval now;
1263 moonbr_now(&now);
1264 timeradd(&now, &worker->pool->idle_timeout, &worker->idle_expiration);
1265 }
1266 }
1268 /* Pops a worker from the queue of idle workers (idle queue must not be empty) */
1269 static struct moonbr_worker *moonbr_pop_idle_worker(struct moonbr_pool *pool) {
1270 struct moonbr_worker *worker;
1271 worker = pool->first_idle_worker;
1272 pool->first_idle_worker = worker->next_idle_worker;
1273 if (pool->first_idle_worker) pool->first_idle_worker->prev_idle_worker = NULL;
1274 else pool->last_idle_worker = NULL;
1275 worker->next_idle_worker = NULL;
1276 worker->idle = 0;
1277 worker->pool->idle_worker_count--;
1278 worker->assigned = 1;
1279 worker->pool->unassigned_worker_count--;
1280 worker->pool->worker_count_stat = 1;
1281 return worker;
1282 }
1285 /*** Functions to communicate with child processes ***/
1287 /* Tells child process to terminate */
1288 static void moonbr_terminate_idle_worker(struct moonbr_worker *worker) {
1289 moonbr_send_control_message(worker, MOONBR_COMMAND_TERMINATE, -1, NULL);
1290 }
1292 /* Handles status messages from child process */
1293 static void moonbr_read_controlchannel(struct moonbr_worker *worker) {
1294 char controlmsg;
1295 {
1296 ssize_t bytes_read;
1297 while ((bytes_read = read(worker->controlfd, &controlmsg, 1)) <= 0) {
1298 if (bytes_read == 0 || errno == ECONNRESET) {
1299 moonbr_log(LOG_WARNING, "Child process in pool #%i with PID %i unexpectedly closed control socket", worker->pool->poolnum, (int)worker->pid);
1300 if (close(worker->controlfd) && errno != EINTR) {
1301 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));
1302 moonbr_terminate_error();
1303 }
1304 worker->controlfd = -1;
1305 moonbr_poll_refresh_needed = 1;
1306 return;
1307 }
1308 if (errno != EINTR) {
1309 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));
1310 moonbr_terminate_error();
1311 }
1312 }
1313 }
1314 if (worker->idle) {
1315 moonbr_log(LOG_CRIT, "Unexpected data from supposedly idle child process in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
1316 moonbr_terminate_error();
1317 }
1318 if (moonbr_debug) {
1319 moonbr_log(LOG_DEBUG, "Received control message from child in pool #%i with PID %i: \"%c\"", worker->pool->poolnum, (int)worker->pid, (int)controlmsg);
1320 }
1321 switch (controlmsg) {
1322 case MOONBR_STATUS_IDLE:
1323 if (moonbr_stat) {
1324 moonbr_log(LOG_INFO, "Child process in pool #%i with PID %i reports as idle", worker->pool->poolnum, (int)worker->pid);
1325 }
1326 moonbr_add_idle_worker(worker);
1327 break;
1328 case MOONBR_STATUS_GOODBYE:
1329 if (moonbr_stat) {
1330 moonbr_log(LOG_INFO, "Child process in pool #%i with PID %i announced termination", worker->pool->poolnum, (int)worker->pid);
1331 }
1332 if (close(worker->controlfd) && errno != EINTR) {
1333 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));
1334 moonbr_terminate_error();
1335 }
1336 worker->controlfd = -1;
1337 moonbr_poll_refresh_needed = 1;
1338 break;
1339 default:
1340 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);
1341 moonbr_terminate_error();
1342 }
1343 }
1345 /* Handles stderr stream from child process */
1346 static void moonbr_read_errorchannel(struct moonbr_worker *worker) {
1347 char staticbuf[MOONBR_MAXERRORLINELEN+1];
1348 char *buf = worker->errorlinebuf;
1349 if (!buf) buf = staticbuf;
1350 {
1351 ssize_t bytes_read;
1352 while (
1353 (bytes_read = read(
1354 worker->errorfd,
1355 buf + worker->errorlinelen,
1356 MOONBR_MAXERRORLINELEN+1 - worker->errorlinelen
1357 )) <= 0
1358 ) {
1359 if (bytes_read == 0 || errno == ECONNRESET) {
1360 if (moonbr_debug) {
1361 moonbr_log(LOG_DEBUG, "Child process in pool #%i with PID %i closed stderr socket", worker->pool->poolnum, (int)worker->pid);
1362 }
1363 if (close(worker->errorfd) && errno != EINTR) {
1364 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));
1365 moonbr_terminate_error();
1366 }
1367 worker->errorfd = -1;
1368 moonbr_poll_refresh_needed = 1;
1369 break;
1370 }
1371 if (errno != EINTR) {
1372 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));
1373 moonbr_terminate_error();
1374 }
1375 }
1376 worker->errorlinelen += bytes_read;
1377 }
1378 {
1379 int i;
1380 for (i=0; i<worker->errorlinelen; i++) {
1381 if (buf[i] == '\n') buf[i] = 0;
1382 if (!buf[i]) {
1383 if (worker->errorlineovf) {
1384 worker->errorlineovf = 0;
1385 } else {
1386 moonbr_log(LOG_WARNING, "Error log from process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, buf);
1387 }
1388 worker->errorlinelen -= i+1;
1389 memmove(buf, buf+i+1, worker->errorlinelen);
1390 i = -1;
1391 }
1392 }
1393 if (i > MOONBR_MAXERRORLINELEN) {
1394 buf[MOONBR_MAXERRORLINELEN] = 0;
1395 if (!worker->errorlineovf) {
1396 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);
1397 }
1398 worker->errorlinelen = 0;
1399 worker->errorlineovf = 1;
1400 }
1401 }
1402 if (!worker->errorlinebuf && worker->errorlinelen) { /* allocate buffer on heap only if necessary */
1403 worker->errorlinebuf = malloc((MOONBR_MAXERRORLINELEN+1) * sizeof(char));
1404 if (!worker->errorlinebuf) {
1405 moonbr_log(LOG_CRIT, "Memory allocation error");
1406 moonbr_terminate_error();
1407 }
1408 memcpy(worker->errorlinebuf, staticbuf, worker->errorlinelen);
1409 }
1410 }
1413 /*** Handler for incoming connections ***/
1415 /* Accepts one or more incoming connections on listener socket and passes it to worker(s) popped from idle queue */
1416 static void moonbr_connect(struct moonbr_pool *pool) {
1417 struct moonbr_listener *listener = moonbr_pop_connected_listener(pool);
1418 struct moonbr_worker *worker;
1419 if (listener->proto == MOONBR_PROTO_MAIN) {
1420 worker = moonbr_pop_idle_worker(pool);
1421 if (moonbr_stat) {
1422 moonbr_log(LOG_INFO, "Dispatching main thread of pool #%i to PID %i", listener->pool->poolnum, (int)worker->pid);
1423 }
1424 worker->main = 1;
1425 moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, -1, listener);
1426 /* do not push listener to queue of idle listeners */
1427 } else if (listener->proto == MOONBR_PROTO_INTERVAL) {
1428 worker = moonbr_pop_idle_worker(pool);
1429 if (moonbr_stat) {
1430 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);
1431 }
1432 worker->restart_interval_listener = listener;
1433 moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, -1, listener);
1434 /* do not push listener to queue of idle listeners yet */
1435 } else {
1436 int peerfd;
1437 do {
1438 peerfd = accept4(listener->listenfd, NULL, NULL, SOCK_CLOEXEC);
1439 if (peerfd == -1) {
1440 if (errno == EWOULDBLOCK) {
1441 break;
1442 } else if (errno == ECONNABORTED) {
1443 moonbr_log(LOG_WARNING, "Connection aborted before accepting it");
1444 break;
1445 } else if (errno != EINTR) {
1446 moonbr_log(LOG_ERR, "Could not accept socket connection: %s", strerror(errno));
1447 moonbr_terminate_error();
1448 }
1449 } else {
1450 worker = moonbr_pop_idle_worker(pool);
1451 if (moonbr_stat) {
1452 moonbr_log(LOG_INFO, "Dispatching connection for pool #%i to PID %i", listener->pool->poolnum, (int)worker->pid);
1453 }
1454 moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, peerfd, listener);
1455 if (close(peerfd) && errno != EINTR) {
1456 moonbr_log(LOG_ERR, "Could not close incoming socket connection in parent process: %s", strerror(errno));
1457 moonbr_terminate_error();
1458 }
1459 }
1460 } while (pool->first_idle_worker);
1461 moonbr_add_idle_listener(listener);
1462 }
1463 }
1466 /*** Functions to initialize and restart interval timers ***/
1468 /* Initializes all interval timers */
1469 static void moonbr_interval_initialize() {
1470 struct timeval now;
1471 struct moonbr_pool *pool;
1472 moonbr_now(&now);
1473 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1474 int i;
1475 for (i=0; i<pool->listener_count; i++) {
1476 struct moonbr_listener *listener = &pool->listener[i];
1477 if (listener->proto == MOONBR_PROTO_INTERVAL) {
1478 timeradd(
1479 &now,
1480 &listener->type_specific.interval.delay,
1481 &listener->type_specific.interval.wakeup
1482 );
1483 }
1484 }
1485 }
1486 }
1488 /* If necessary, restarts interval timers and queues interval listener as idle after a worker changed status */
1489 static void moonbr_interval_restart(
1490 struct moonbr_worker *worker,
1491 struct timeval *now /* passed to synchronize with moonbr_run() function */
1492 ) {
1493 struct moonbr_listener *listener = worker->restart_interval_listener;
1494 if (listener) {
1495 moonbr_add_idle_listener(listener);
1496 worker->restart_interval_listener = NULL;
1497 if (listener->type_specific.interval.strict) {
1498 timeradd(
1499 &listener->type_specific.interval.wakeup,
1500 &listener->type_specific.interval.delay,
1501 &listener->type_specific.interval.wakeup
1502 );
1503 if (timercmp(&listener->type_specific.interval.wakeup, now, <)) {
1504 listener->type_specific.interval.wakeup = *now;
1505 }
1506 } else {
1507 timeradd(
1508 now,
1509 &listener->type_specific.interval.delay,
1510 &listener->type_specific.interval.wakeup
1511 );
1512 }
1513 }
1514 }
1517 /*** Main loop and helper functions ***/
1519 /* Stores the earliest required wakeup time in 'wait' variable */
1520 static void moonbr_calc_wait(struct timeval *wait, struct timeval *wakeup) {
1521 if (!timerisset(wait) || timercmp(wakeup, wait, <)) *wait = *wakeup;
1522 }
1524 /* Main loop of Moonbridge system (including initialization of signal handlers and polling structures) */
1525 static void moonbr_run(lua_State *L) {
1526 struct timeval now;
1527 struct moonbr_pool *pool;
1528 struct moonbr_worker *worker;
1529 struct moonbr_worker *next_worker; /* needed when worker is removed during iteration of workers */
1530 struct moonbr_listener *listener;
1531 struct moonbr_listener *next_listener; /* needed when listener is removed during iteration of listeners */
1532 int i;
1533 moonbr_poll_init(); /* must be executed before moonbr_signal_init() */
1534 moonbr_signal_init();
1535 moonbr_interval_initialize();
1536 moonbr_pstate = MOONBR_PSTATE_RUNNING;
1537 while (1) {
1538 struct timeval wait = {0, }; /* point in time when premature wakeup of poll() is required */
1539 if (moonbr_cond_interrupt) {
1540 moonbr_log(LOG_WARNING, "Fast shutdown requested");
1541 moonbr_terminate(MOONBR_EXITCODE_GRACEFUL);
1542 }
1543 if (moonbr_cond_terminate) {
1544 moonbr_initiate_shutdown();
1545 moonbr_cond_terminate = 0;
1546 }
1547 moonbr_cond_child = 0; /* must not be reset between moonbr_try_destroy_worker() and poll() */
1548 moonbr_now(&now);
1549 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1550 int terminated_worker_count = 0; /* allows shortcut for new worker creation */
1551 /* terminate idle workers when expired */
1552 if (timerisset(&pool->idle_timeout)) {
1553 while ((worker = pool->first_idle_worker) != NULL) {
1554 if (timercmp(&worker->idle_expiration, &now, >)) break;
1555 moonbr_pop_idle_worker(pool);
1556 moonbr_terminate_idle_worker(worker);
1557 }
1558 }
1559 /* mark listeners as connected when incoming connection is pending */
1560 for (listener=pool->first_idle_listener; listener; listener=next_listener) {
1561 next_listener = listener->next_listener; /* extra variable necessary due to changing list */
1562 if (listener->pollidx != -1) {
1563 if (moonbr_poll_fds[listener->pollidx].revents) {
1564 moonbr_poll_fds[listener->pollidx].revents = 0;
1565 moonbr_remove_idle_listener(listener);
1566 moonbr_add_connected_listener(listener);
1567 }
1568 } else if (
1569 listener->proto != MOONBR_PROTO_INTERVAL ||
1570 !timercmp(&listener->type_specific.interval.wakeup, &now, >)
1571 ) {
1572 moonbr_remove_idle_listener(listener);
1573 moonbr_add_connected_listener(listener);
1574 }
1575 }
1576 /* process input from child processes */
1577 for (i=0; i<moonbr_poll_worker_count; i++) {
1578 if (moonbr_poll_worker_fds[i].revents) {
1579 moonbr_poll_worker_fds[i].revents = 0;
1580 struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[i];
1581 switch (poll_worker->channel) {
1582 case MOONBR_POLL_WORKER_CONTROLCHANNEL:
1583 moonbr_read_controlchannel(poll_worker->worker);
1584 moonbr_interval_restart(poll_worker->worker, &now);
1585 break;
1586 case MOONBR_POLL_WORKER_ERRORCHANNEL:
1587 moonbr_read_errorchannel(poll_worker->worker);
1588 break;
1589 }
1590 }
1591 }
1592 /* collect dead child processes */
1593 for (worker=pool->first_worker; worker; worker=next_worker) {
1594 next_worker = worker->next_worker; /* extra variable necessary due to changing list */
1595 switch (moonbr_try_destroy_worker(worker)) {
1596 case MOONBR_DESTROY_PREPARE:
1597 pool->use_fork_error_wakeup = 1;
1598 break;
1599 case MOONBR_DESTROY_IDLE_OR_ASSIGNED:
1600 terminated_worker_count++;
1601 break;
1602 }
1603 }
1604 if (!moonbr_shutdown_in_progress) {
1605 /* connect listeners with idle workers */
1606 while (pool->first_connected_listener && pool->first_idle_worker) {
1607 moonbr_connect(pool);
1608 }
1609 /* create new worker processes */
1610 while (
1611 pool->total_worker_count < pool->max_fork && (
1612 pool->unassigned_worker_count < pool->pre_fork ||
1613 pool->total_worker_count < pool->min_fork
1614 )
1615 ) {
1616 if (pool->use_fork_error_wakeup) {
1617 if (timercmp(&pool->fork_error_wakeup, &now, >)) {
1618 moonbr_calc_wait(&wait, &pool->fork_error_wakeup);
1619 break;
1620 }
1621 } else {
1622 if (terminated_worker_count) {
1623 terminated_worker_count--;
1624 } else if (timercmp(&pool->fork_wakeup, &now, >)) {
1625 moonbr_calc_wait(&wait, &pool->fork_wakeup);
1626 break;
1627 }
1628 }
1629 if (moonbr_create_worker(pool, L)) {
1630 /* on error, enforce error delay */
1631 timeradd(&now, &pool->fork_error_delay, &pool->fork_error_wakeup);
1632 pool->use_fork_error_wakeup = 1;
1633 moonbr_calc_wait(&wait, &pool->fork_error_wakeup);
1634 break;
1635 } else {
1636 /* normal fork delay on success */
1637 timeradd(&now, &pool->fork_delay, &pool->fork_wakeup);
1638 timeradd(&now, &pool->fork_error_delay, &pool->fork_error_wakeup);
1639 pool->use_fork_error_wakeup = 0; /* gets set later if error occures during preparation */
1640 }
1641 }
1642 /* terminate excessive worker processes */
1643 while (
1644 pool->total_worker_count > pool->min_fork &&
1645 pool->idle_worker_count > pool->pre_fork
1646 ) {
1647 if (timerisset(&pool->exit_wakeup)) {
1648 if (timercmp(&pool->exit_wakeup, &now, >)) {
1649 moonbr_calc_wait(&wait, &pool->exit_wakeup);
1650 break;
1651 }
1652 moonbr_terminate_idle_worker(moonbr_pop_idle_worker(pool));
1653 timeradd(&now, &pool->exit_delay, &pool->exit_wakeup);
1654 } else {
1655 timeradd(&now, &pool->exit_delay, &pool->exit_wakeup);
1656 break;
1657 }
1658 }
1659 if (!(
1660 pool->total_worker_count > pool->min_fork &&
1661 pool->idle_worker_count > pool->pre_fork
1662 )) {
1663 timerclear(&pool->exit_wakeup); /* timer gets restarted later when there are excessive workers */
1664 }
1665 }
1666 /* optionally output worker count stats */
1667 if (moonbr_stat && pool->worker_count_stat) {
1668 pool->worker_count_stat = 0;
1669 moonbr_log(
1670 LOG_INFO,
1671 "Worker count for pool #%i: %i idle, %i assigned, %i total",
1672 pool->poolnum, pool->idle_worker_count,
1673 pool->total_worker_count - pool->unassigned_worker_count,
1674 pool->total_worker_count);
1675 }
1676 /* calculate wakeup time for interval listeners */
1677 for (listener=pool->first_idle_listener; listener; listener=listener->next_listener) {
1678 if (listener->proto == MOONBR_PROTO_INTERVAL) {
1679 moonbr_calc_wait(&wait, &listener->type_specific.interval.wakeup);
1680 }
1681 }
1682 /* calculate wakeup time for idle workers (only first idle worker is significant) */
1683 if (timerisset(&pool->idle_timeout) && pool->first_idle_worker) {
1684 moonbr_calc_wait(&wait, &pool->first_idle_worker->idle_expiration);
1685 }
1686 }
1687 /* terminate idle workers in case of shutdown and check if shutdown is complete */
1688 if (moonbr_shutdown_in_progress) {
1689 int remaining = 0;
1690 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1691 while (pool->idle_worker_count) {
1692 moonbr_terminate_idle_worker(moonbr_pop_idle_worker(pool));
1693 }
1694 if (pool->first_worker) remaining = 1;
1695 }
1696 if (!remaining) {
1697 moonbr_log(LOG_INFO, "All worker threads have terminated");
1698 moonbr_terminate(MOONBR_EXITCODE_GRACEFUL);
1699 }
1700 }
1701 if (moonbr_poll_refresh_needed) moonbr_poll_refresh();
1702 moonbr_cond_poll = 1;
1703 if (!moonbr_cond_child && !moonbr_cond_terminate && !moonbr_cond_interrupt) {
1704 int timeout;
1705 if (timerisset(&wait)) {
1706 if (timercmp(&wait, &now, <)) {
1707 moonbr_log(LOG_CRIT, "Internal error (should not happen): Future is in the past");
1708 moonbr_terminate_error();
1709 }
1710 timersub(&wait, &now, &wait);
1711 timeout = wait.tv_sec * 1000 + wait.tv_usec / 1000;
1712 } else {
1713 timeout = INFTIM;
1714 }
1715 if (moonbr_debug) {
1716 moonbr_log(LOG_DEBUG, "Waiting for I/O");
1717 }
1718 poll(moonbr_poll_fds, moonbr_poll_fds_count, timeout);
1719 } else {
1720 if (moonbr_debug) {
1721 moonbr_log(LOG_DEBUG, "Do not wait for I/O");
1722 }
1723 }
1724 moonbr_cond_poll = 0;
1725 moonbr_poll_reset_signal();
1726 }
1727 }
1730 /*** Lua interface ***/
1732 static int moonbr_lua_panic(lua_State *L) {
1733 const char *errmsg;
1734 errmsg = lua_tostring(L, -1);
1735 if (!errmsg) {
1736 if (lua_isnoneornil(L, -1)) errmsg = "(error message is nil)";
1737 else errmsg = "(error message is not a string)";
1738 }
1739 if (moonbr_pstate == MOONBR_PSTATE_FORKED) {
1740 fprintf(stderr, "Uncaught Lua error: %s\n", errmsg);
1741 exit(1);
1742 } else {
1743 moonbr_log(LOG_CRIT, "Uncaught Lua error: %s", errmsg);
1744 moonbr_terminate_error();
1745 }
1746 return 0;
1747 }
1749 static int moonbr_addtraceback(lua_State *L) {
1750 luaL_traceback(L, L, luaL_tolstring(L, 1, NULL), 1);
1751 return 1;
1752 }
1754 /* Memory allocator that allows limiting memory consumption */
1755 static void *moonbr_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
1756 (void)ud; /* not used */
1757 if (nsize == 0) {
1758 if (ptr) {
1759 moonbr_memory_usage -= osize;
1760 free(ptr);
1761 }
1762 return NULL;
1763 } else if (ptr) {
1764 if (
1765 moonbr_memory_limit &&
1766 nsize > osize &&
1767 moonbr_memory_usage + (nsize - osize) > moonbr_memory_limit
1768 ) {
1769 return NULL;
1770 } else {
1771 ptr = realloc(ptr, nsize);
1772 if (ptr) moonbr_memory_usage += nsize - osize;
1773 }
1774 } else {
1775 if (
1776 moonbr_memory_limit &&
1777 moonbr_memory_usage + nsize > moonbr_memory_limit
1778 ) {
1779 return NULL;
1780 } else {
1781 ptr = realloc(ptr, nsize);
1782 if (ptr) moonbr_memory_usage += nsize;
1783 }
1784 }
1785 return ptr;
1786 }
1788 static int moonbr_lua_tonatural(lua_State *L, int idx) {
1789 int isnum;
1790 lua_Number n;
1791 n = lua_tonumberx(L, idx, &isnum);
1792 if (isnum && n>=0 && n<INT_MAX && (lua_Number)(int)n == n) return n;
1793 else return -1;
1794 }
1796 static int moonbr_lua_totimeval(lua_State *L, int idx, struct timeval *value) {
1797 int isnum;
1798 lua_Number n;
1799 n = lua_tonumberx(L, idx, &isnum);
1800 if (isnum && n>=0 && n<=100000000) {
1801 value->tv_sec = n;
1802 value->tv_usec = 1e6 * (n - value->tv_sec);
1803 return 1;
1804 } else {
1805 return 0;
1806 }
1807 }
1809 static int moonbr_timeout(lua_State *L) {
1810 struct itimerval oldval;
1811 if (lua_isnoneornil(L, 1) && lua_isnoneornil(L, 2)) {
1812 getitimer(ITIMER_REAL, &oldval);
1813 } else {
1814 struct itimerval newval = {};
1815 timerclear(&newval.it_interval);
1816 timerclear(&newval.it_value);
1817 if (lua_toboolean(L, 1)) {
1818 luaL_argcheck(
1819 L, moonbr_lua_totimeval(L, 1, &newval.it_value), 1,
1820 "interval in seconds expected"
1821 );
1822 }
1823 if (lua_isnoneornil(L, 2)) {
1824 if (setitimer(ITIMER_REAL, &newval, &oldval)) {
1825 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1826 moonbr_terminate_error();
1827 }
1828 } else {
1829 getitimer(ITIMER_REAL, &oldval);
1830 if (!timerisset(&oldval.it_value)) {
1831 if (setitimer(ITIMER_REAL, &newval, NULL)) {
1832 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1833 moonbr_terminate_error();
1834 }
1835 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
1836 timerclear(&newval.it_value);
1837 if (setitimer(ITIMER_REAL, &newval, NULL)) {
1838 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1839 moonbr_terminate_error();
1840 }
1841 } else if (timercmp(&newval.it_value, &oldval.it_value, <)) {
1842 struct itimerval remval;
1843 if (setitimer(ITIMER_REAL, &newval, NULL)) {
1844 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1845 moonbr_terminate_error();
1846 }
1847 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
1848 getitimer(ITIMER_REAL, &remval);
1849 timersub(&oldval.it_value, &newval.it_value, &newval.it_value);
1850 timeradd(&newval.it_value, &remval.it_value, &newval.it_value);
1851 if (setitimer(ITIMER_REAL, &newval, NULL)) {
1852 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1853 moonbr_terminate_error();
1854 }
1855 } else {
1856 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
1857 }
1858 return lua_gettop(L) - 1;
1859 }
1860 }
1861 lua_pushnumber(L, oldval.it_value.tv_sec + 1e-6 * oldval.it_value.tv_usec);
1862 return 1;
1863 }
1865 #define moonbr_listen_init_pool_forkoption(luaname, cname, defval) { \
1866 lua_getfield(L, 2, luaname); \
1867 pool->cname = lua_isnil(L, -1) ? (defval) : moonbr_lua_tonatural(L, -1); \
1868 } while(0)
1870 #define moonbr_listen_init_pool_timeoption(luaname, cname, defval, defvalu) ( \
1871 lua_getfield(L, 2, luaname), \
1872 lua_isnil(L, -1) ? ( \
1873 pool->cname.tv_sec = (defval), pool->cname.tv_usec = (defvalu), \
1874 1 \
1875 ) : ( \
1876 (lua_isboolean(L, -1) && !lua_toboolean(L, -1)) ? ( \
1877 pool->cname.tv_sec = 0, pool->cname.tv_usec = 0, \
1878 1 \
1879 ) : ( \
1880 moonbr_lua_totimeval(L, -1, &pool->cname) \
1881 ) \
1882 ) \
1883 )
1885 static int moonbr_listen_init_pool(lua_State *L) {
1886 struct moonbr_pool *pool;
1887 const char *proto;
1888 int i;
1889 int dynamic = 0; /* nonzero = listeners exist which require dynamic worker creation */
1890 pool = lua_touserdata(L, 1);
1891 for (i=0; i<pool->listener_count; i++) {
1892 struct moonbr_listener *listener = &pool->listener[i];
1893 lua_settop(L, 2);
1894 #if LUA_VERSION_NUM >= 503
1895 lua_geti(L, 2, i+1);
1896 #else
1897 lua_pushinteger(L, i+1);
1898 lua_gettable(L, 2);
1899 #endif
1900 lua_getfield(L, 3, "proto");
1901 proto = lua_tostring(L, -1);
1902 if (proto && !strcmp(proto, "main")) {
1903 listener->proto = MOONBR_PROTO_MAIN;
1904 } else if (proto && !strcmp(proto, "interval")) {
1905 dynamic = 1;
1906 listener->proto = MOONBR_PROTO_INTERVAL;
1907 lua_getfield(L, 3, "name");
1908 {
1909 const char *name = lua_tostring(L, -1);
1910 if (name) {
1911 char *name_dup = strdup(name);
1912 if (!name_dup) {
1913 moonbr_log(LOG_CRIT, "Memory allocation_error");
1914 moonbr_terminate_error();
1915 }
1916 listener->type_specific.interval.name = name_dup;
1917 }
1918 }
1919 lua_getfield(L, 3, "delay");
1920 if (
1921 !moonbr_lua_totimeval(L, -1, &listener->type_specific.interval.delay) ||
1922 !timerisset(&listener->type_specific.interval.delay)
1923 ) {
1924 luaL_error(L, "No valid interval delay specified; use listen{{proto=\"interval\", delay=...}, ...}");
1925 }
1926 lua_getfield(L, 3, "strict");
1927 if (!lua_isnil(L, -1)) {
1928 if (lua_isboolean(L, -1)) {
1929 if (lua_toboolean(L, -1)) listener->type_specific.interval.strict = 1;
1930 } else {
1931 luaL_error(L, "Option \"strict\" must be a boolean if set; use listen{{proto=\"interval\", strict=true, ...}, ...}");
1932 }
1933 }
1934 } else if (proto && !strcmp(proto, "local")) {
1935 const char *path;
1936 const int path_maxlen = (
1937 sizeof(listener->type_specific.socket.addr.addr_un) -
1938 ((void *)listener->type_specific.socket.addr.addr_un.sun_path - (void *)&listener->type_specific.socket.addr.addr_un)
1939 ) - 1; /* one byte for termination */
1940 dynamic = 1;
1941 listener->proto = MOONBR_PROTO_LOCAL;
1942 lua_getfield(L, 3, "path");
1943 path = lua_tostring(L, -1);
1944 if (!path) {
1945 luaL_error(L, "No valid path specified for local socket; use listen{{proto=\"local\", path=...}, ...}");
1946 }
1947 if (strlen(path) > path_maxlen) {
1948 luaL_error(L, "Path name for local socket exceeded maximum length of %i characters", path_maxlen);
1949 }
1950 strcpy(listener->type_specific.socket.addr.addr_un.sun_path, path);
1951 } else if (proto && !strcmp(proto, "tcp")) {
1952 const char *host, *port;
1953 struct addrinfo hints = { 0, };
1954 struct addrinfo *res, *addrinfo;
1955 int errcode;
1956 const char *ip;
1957 dynamic = 1;
1958 lua_getfield(L, 3, "host");
1959 host = lua_isnil(L, -1) ? "::" : lua_tostring(L, -1);
1960 if (!host) {
1961 luaL_error(L, "No host specified; use listen{{proto=\"tcp\", host=...}, ...}");
1962 }
1963 lua_getfield(L, 3, "port");
1964 port = lua_tostring(L, -1);
1965 if (!port) {
1966 luaL_error(L, "No port specified; use listen{{proto=\"tcp\", host=...}, ...}");
1967 }
1968 hints.ai_family = AF_UNSPEC;
1969 hints.ai_socktype = SOCK_STREAM;
1970 hints.ai_protocol = IPPROTO_TCP;
1971 hints.ai_flags = AI_ADDRCONFIG | AI_PASSIVE;
1972 errcode = getaddrinfo(host, port, &hints, &res);
1973 if (errcode) {
1974 freeaddrinfo(res);
1975 if (errcode == EAI_SYSTEM) {
1976 char errmsg[MOONBR_MAXSTRERRORLEN];
1977 strerror_r(errno, errmsg, MOONBR_MAXSTRERRORLEN); /* use thread-safe call in case child created threads */
1978 luaL_error(L, "Could not resolve host: %s: %s", gai_strerror(errcode), errmsg);
1979 } else {
1980 luaL_error(L, "Could not resolve host: %s", gai_strerror(errcode));
1981 }
1982 }
1983 for (addrinfo=res; addrinfo; addrinfo=addrinfo->ai_next) {
1984 if (addrinfo->ai_family == AF_INET6) goto moonbr_listen_init_pool_found;
1985 }
1986 for (addrinfo=res; addrinfo; addrinfo=addrinfo->ai_next) {
1987 if (addrinfo->ai_family == AF_INET) goto moonbr_listen_init_pool_found;
1988 }
1989 addrinfo = res;
1990 moonbr_listen_init_pool_found:
1991 if (addrinfo->ai_addrlen > sizeof(listener->type_specific.socket.addr)) {
1992 moonbr_log(LOG_CRIT, "Size of ai_addrlen is unexpectedly big (should not happen)");
1993 moonbr_terminate_error();
1994 }
1995 memcpy(&listener->type_specific.socket.addr, addrinfo->ai_addr, addrinfo->ai_addrlen);
1996 listener->type_specific.socket.addrlen = addrinfo->ai_addrlen;
1997 switch (addrinfo->ai_family) {
1998 case AF_INET6:
1999 ip = inet_ntop(
2000 addrinfo->ai_family,
2001 &((struct sockaddr_in6 *)addrinfo->ai_addr)->sin6_addr,
2002 listener->proto_specific.tcp.ip,
2003 INET6_ADDRSTRLEN
2004 );
2005 if (!ip) {
2006 moonbr_log(LOG_CRIT, "System error in inet_ntop call: %s", strerror(errno));
2007 moonbr_terminate_error();
2008 }
2009 listener->proto_specific.tcp.port = ntohs(((struct sockaddr_in6 *)addrinfo->ai_addr)->sin6_port);
2010 break;
2011 case AF_INET:
2012 ip = inet_ntop(
2013 addrinfo->ai_family,
2014 &((struct sockaddr_in *)addrinfo->ai_addr)->sin_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_in *)addrinfo->ai_addr)->sin_port);
2023 break;
2024 default:
2025 strcpy(listener->proto_specific.tcp.ip, "unknown");
2026 listener->proto_specific.tcp.port = 0;
2027 }
2028 listener->proto = MOONBR_PROTO_TCP;
2029 } else if (proto) {
2030 luaL_error(L, "Unknown protocol \"%s\"", proto);
2031 } else {
2032 luaL_error(L, "No valid protocol specified; use listen{{proto=..., ...}, ...}");
2033 }
2034 }
2035 lua_settop(L, 2);
2036 if (dynamic) {
2037 moonbr_listen_init_pool_forkoption("pre_fork", pre_fork, 1);
2038 moonbr_listen_init_pool_forkoption("min_fork", min_fork, pool->pre_fork > 2 ? pool->pre_fork : 2);
2039 moonbr_listen_init_pool_forkoption("max_fork", max_fork, pool->min_fork > 16 ? pool->min_fork : 16);
2040 if (!moonbr_listen_init_pool_timeoption("fork_delay", fork_delay, 0, 250000)) {
2041 luaL_error(L, "Option \"fork_delay\" is expected to be a non-negative number");
2042 }
2043 if (!moonbr_listen_init_pool_timeoption("fork_error_delay", fork_error_delay, 2, 0)) {
2044 luaL_error(L, "Option \"fork_error_delay\" is expected to be a non-negative number");
2045 }
2046 if (!moonbr_listen_init_pool_timeoption("exit_delay", exit_delay, 60, 0)) {
2047 luaL_error(L, "Option \"exit_delay\" is expected to be a non-negative number");
2048 }
2049 if (timercmp(&pool->fork_error_delay, &pool->fork_delay, <)) {
2050 pool->fork_error_delay = pool->fork_delay;
2051 }
2052 if (!moonbr_listen_init_pool_timeoption("idle_timeout", idle_timeout, 0, 0)) {
2053 luaL_error(L, "Option \"idle_timeout\" is expected to be a non-negative number");
2054 }
2055 } else {
2056 pool->pre_fork = 0;
2057 pool->min_fork = pool->listener_count;
2058 pool->max_fork = pool->listener_count;
2059 }
2060 lua_getfield(L, 2, "memory_limit");
2061 if (!lua_isnil(L, -1)) {
2062 int isnum;
2063 lua_Number n;
2064 n = lua_tonumberx(L, -1, &isnum);
2065 if (n < 0 || !isnum) {
2066 luaL_error(L, "Option \"memory_limit\" is expected to be a non-negative number");
2067 }
2068 pool->memory_limit = n;
2069 }
2070 lua_settop(L, 2);
2071 lua_getfield(L, 2, "prepare");
2072 if (!lua_isnil(L, -1) && !lua_isfunction(L, -1)) {
2073 luaL_error(L, "Option \"prepare\" must be nil or a function");
2074 }
2075 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
2076 lua_getfield(L, 2, "connect");
2077 if (!lua_isfunction(L, -1)) {
2078 luaL_error(L, "Option \"connect\" must be a function; use listen{{...}, {...}, connect=function(socket) ... end, ...}");
2079 }
2080 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
2081 lua_getfield(L, 2, "finish");
2082 if (!lua_isnil(L, -1) && !lua_isfunction(L, -1)) {
2083 luaL_error(L, "Option \"finish\" must be nil or a function");
2084 }
2085 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
2086 return 0;
2087 }
2089 static int moonbr_listen(lua_State *L) {
2090 struct moonbr_pool *pool;
2091 lua_Integer listener_count;
2092 if (moonbr_booted) luaL_error(L, "Moonbridge bootup is already complete");
2093 luaL_checktype(L, 1, LUA_TTABLE);
2094 listener_count = luaL_len(L, 1);
2095 if (!listener_count) luaL_error(L, "No listen ports specified; use listen{{proto=..., port=...},...}");
2096 if (listener_count > 100) luaL_error(L, "Too many listeners");
2097 pool = moonbr_create_pool(listener_count);
2098 lua_pushcfunction(L, moonbr_listen_init_pool);
2099 lua_pushlightuserdata(L, pool);
2100 lua_pushvalue(L, 1);
2101 if (lua_pcall(L, 2, 0, 0)) goto moonbr_listen_error;
2102 {
2103 int i;
2104 i = moonbr_start_pool(pool);
2105 if (i >= 0) {
2106 lua_pushfstring(L, "Could not initialize listener #%d: %s", i+1, strerror(errno));
2107 moonbr_listen_error:
2108 moonbr_destroy_pool(pool);
2109 lua_pushnil(L);
2110 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
2111 lua_pushnil(L);
2112 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
2113 lua_pushnil(L);
2114 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
2115 lua_error(L);
2116 }
2117 }
2118 return 0;
2119 }
2122 /*** Function to modify Lua's library path and/or cpath ***/
2124 #if defined(MOONBR_LUA_PATH) || defined(MOONBR_LUA_CPATH)
2125 static void moonbr_modify_path(lua_State *L, char *key, char *value) {
2126 int stackbase;
2127 stackbase = lua_gettop(L);
2128 lua_getglobal(L, "package");
2129 lua_getfield(L, stackbase+1, key);
2130 {
2131 const char *current_str;
2132 size_t current_strlen;
2133 luaL_Buffer buf;
2134 current_str = lua_tolstring(L, stackbase+2, ¤t_strlen);
2135 luaL_buffinit(L, &buf);
2136 if (current_str) {
2137 lua_pushvalue(L, stackbase+2);
2138 luaL_addvalue(&buf);
2139 if (current_strlen && current_str[current_strlen-1] != ';') {
2140 luaL_addchar(&buf, ';');
2141 }
2142 }
2143 luaL_addstring(&buf, value);
2144 luaL_pushresult(&buf);
2145 }
2146 lua_setfield(L, stackbase+1, key);
2147 lua_settop(L, stackbase);
2148 }
2149 #endif
2152 /*** Main function and command line invokation ***/
2154 static void moonbr_usage(int err, const char *cmd) {
2155 FILE *out;
2156 out = err ? stderr : stdout;
2157 if (!cmd) cmd = "moonbridge";
2158 fprintf(out, "Get this help message: %s {-h|--help}\n", cmd);
2159 fprintf(out, "Usage: %s \\\n", cmd);
2160 fprintf(out, " [-b|--background] \\\n");
2161 fprintf(out, " [-d|--debug] \\\n");
2162 fprintf(out, " [-f|--logfacility {DAEMON|USER|0|1|...|7}] \\\n");
2163 fprintf(out, " [-i|--logident <syslog ident> \\\n");
2164 fprintf(out, " [-l|--logfile <logfile>] \\\n");
2165 fprintf(out, " [-p|--pidfile <pidfile>] \\\n");
2166 fprintf(out, " [-s|--stats] \\\n");
2167 fprintf(out, " -- <Lua script> [<cmdline options for Lua script>]\n");
2168 exit(err);
2169 }
2171 #define moonbr_usage_error() moonbr_usage(MOONBR_EXITCODE_CMDLINEERROR, argc ? argv[0] : NULL)
2173 int main(int argc, char **argv) {
2174 {
2175 int daemonize = 0;
2176 int log_facility = LOG_USER;
2177 const char *log_ident = "moonbridge";
2178 const char *log_filename = NULL;
2179 const char *pid_filename = NULL;
2180 int option;
2181 struct option longopts[] = {
2182 { "background", no_argument, NULL, 'b' },
2183 { "debug", no_argument, NULL, 'd' },
2184 { "logfacility", required_argument, NULL, 'f' },
2185 { "help", no_argument, NULL, 'h' },
2186 { "logident", required_argument, NULL, 'i' },
2187 { "logfile", required_argument, NULL, 'l' },
2188 { "pidfile", required_argument, NULL, 'p' },
2189 { "stats", no_argument, NULL, 's' }
2190 };
2191 while ((option = getopt_long(argc, argv, "bdf:hi:l:p:s", longopts, NULL)) != -1) {
2192 switch (option) {
2193 case 'b':
2194 daemonize = 1;
2195 break;
2196 case 'd':
2197 moonbr_debug = 1;
2198 moonbr_stat = 1;
2199 break;
2200 case 'f':
2201 if (!strcmp(optarg, "DAEMON")) {
2202 log_facility = LOG_DAEMON;
2203 } else if (!strcmp(optarg, "USER")) {
2204 log_facility = LOG_USER;
2205 } else if (!strcmp(optarg, "0")) {
2206 log_facility = LOG_LOCAL0;
2207 } else if (!strcmp(optarg, "1")) {
2208 log_facility = LOG_LOCAL1;
2209 } else if (!strcmp(optarg, "2")) {
2210 log_facility = LOG_LOCAL2;
2211 } else if (!strcmp(optarg, "3")) {
2212 log_facility = LOG_LOCAL3;
2213 } else if (!strcmp(optarg, "4")) {
2214 log_facility = LOG_LOCAL4;
2215 } else if (!strcmp(optarg, "5")) {
2216 log_facility = LOG_LOCAL5;
2217 } else if (!strcmp(optarg, "6")) {
2218 log_facility = LOG_LOCAL6;
2219 } else if (!strcmp(optarg, "7")) {
2220 log_facility = LOG_LOCAL7;
2221 } else {
2222 moonbr_usage_error();
2223 }
2224 moonbr_use_syslog = 1;
2225 break;
2226 case 'h':
2227 moonbr_usage(MOONBR_EXITCODE_GRACEFUL, argv[0]);
2228 break;
2229 case 'i':
2230 log_ident = optarg;
2231 moonbr_use_syslog = 1;
2232 break;
2233 case 'l':
2234 log_filename = optarg;
2235 break;
2236 case 'p':
2237 pid_filename = optarg;
2238 break;
2239 case 's':
2240 moonbr_stat = 1;
2241 break;
2242 default:
2243 moonbr_usage_error();
2244 }
2245 }
2246 if (argc - optind < 1) moonbr_usage_error();
2247 if (pid_filename) {
2248 pid_t otherpid;
2249 while ((moonbr_pidfh = pidfile_open(pid_filename, 0644, &otherpid)) == NULL) {
2250 if (errno == EEXIST) {
2251 if (otherpid == -1) {
2252 fprintf(stderr, "PID file \"%s\" is already locked\n", pid_filename);
2253 } else {
2254 fprintf(stderr, "PID file \"%s\" is already locked by process with PID: %i\n", pid_filename, (int)otherpid);
2255 }
2256 exit(MOONBR_EXITCODE_ALREADYRUNNING);
2257 } else if (errno != EINTR) {
2258 fprintf(stderr, "Could not write PID file \"%s\": %s\n", pid_filename, strerror(errno));
2259 exit(MOONBR_EXITCODE_STARTUPERROR);
2260 }
2261 }
2262 }
2263 if (log_filename) {
2264 int logfd;
2265 while (
2266 ( logfd = flopen(
2267 log_filename,
2268 O_WRONLY|O_NONBLOCK|O_CREAT|O_APPEND|O_CLOEXEC,
2269 0640
2270 )
2271 ) < 0
2272 ) {
2273 if (errno == EWOULDBLOCK) {
2274 fprintf(stderr, "Logfile \"%s\" is locked\n", log_filename);
2275 exit(MOONBR_EXITCODE_ALREADYRUNNING);
2276 } else if (errno != EINTR) {
2277 fprintf(stderr, "Could not open logfile \"%s\": %s\n", log_filename, strerror(errno));
2278 exit(MOONBR_EXITCODE_STARTUPERROR);
2279 }
2280 }
2281 moonbr_logfile = fdopen(logfd, "a");
2282 if (!moonbr_logfile) {
2283 fprintf(stderr, "Could not open write stream to logfile \"%s\": %s\n", log_filename, strerror(errno));
2284 exit(MOONBR_EXITCODE_STARTUPERROR);
2285 }
2286 }
2287 if (daemonize == 0 && !moonbr_logfile) moonbr_logfile = stderr;
2288 if (moonbr_logfile) setlinebuf(moonbr_logfile);
2289 else moonbr_use_syslog = 1;
2290 if (moonbr_use_syslog) openlog(log_ident, LOG_NDELAY | LOG_PID, log_facility);
2291 if (daemonize) {
2292 if (daemon(1, 0)) {
2293 moonbr_log(LOG_ERR, "Could not daemonize moonbridge process");
2294 moonbr_terminate_error();
2295 }
2296 }
2297 }
2298 moonbr_log(LOG_NOTICE, "Starting moonbridge server");
2299 if (moonbr_pidfh && pidfile_write(moonbr_pidfh)) {
2300 moonbr_log(LOG_ERR, "Could not write pidfile (after locking)");
2301 }
2302 {
2303 lua_State *L;
2304 L = lua_newstate(moonbr_alloc, NULL);
2305 if (!L) {
2306 moonbr_log(LOG_CRIT, "Could not initialize Lua state");
2307 moonbr_terminate_error();
2308 }
2309 lua_atpanic(L, moonbr_lua_panic);
2310 lua_pushliteral(L, MOONBR_VERSION_STRING);
2311 lua_setglobal(L, "_MOONBRIDGE_VERSION");
2312 luaL_openlibs(L);
2313 luaL_requiref(L, "moonbridge_io", luaopen_moonbridge_io, 1);
2314 lua_pop(L, 1);
2315 #ifdef MOONBR_LUA_PATH
2316 moonbr_modify_path(L, "path", MOONBR_LUA_PATH);
2317 #endif
2318 #ifdef MOONBR_LUA_CPATH
2319 moonbr_modify_path(L, "cpath", MOONBR_LUA_CPATH);
2320 #endif
2321 lua_pushcfunction(L, moonbr_timeout);
2322 lua_setglobal(L, "timeout");
2323 lua_pushcfunction(L, moonbr_listen);
2324 lua_setglobal(L, "listen");
2325 lua_pushcfunction(L, moonbr_addtraceback); /* on stack position 1 */
2326 moonbr_log(LOG_INFO, "Loading \"%s\"", argv[optind]);
2327 if (luaL_loadfile(L, argv[optind])) {
2328 moonbr_log(LOG_ERR, "Error while loading \"%s\": %s", argv[optind], lua_tostring(L, -1));
2329 moonbr_terminate_error();
2330 }
2331 { int i; for (i=optind+1; i<argc; i++) lua_pushstring(L, argv[i]); }
2332 if (lua_pcall(L, argc-(optind+1), 0, 1)) {
2333 moonbr_log(LOG_ERR, "Error while executing \"%s\": %s", argv[optind], lua_tostring(L, -1));
2334 moonbr_terminate_error();
2335 }
2336 if (!moonbr_first_pool) {
2337 moonbr_log(LOG_WARNING, "No listener initialized.");
2338 moonbr_terminate_error();
2339 }
2340 lua_getglobal(L, "listen");
2341 lua_pushcfunction(L, moonbr_listen);
2342 if (lua_compare(L, -2, -1, LUA_OPEQ)) {
2343 lua_pushnil(L);
2344 lua_setglobal(L, "listen");
2345 }
2346 lua_settop(L, 1);
2347 lua_gc(L, LUA_GCCOLLECT, 0); // collect garbage before forking later
2348 moonbr_run(L);
2349 }
2350 return 0;
2351 }