1 | /***************************************
2 | $Revision: 1.37 $
3 |
4 | Example code: A server for a client to connect to.
5 |
6 | Status: NOT REVUED, NOT TESTED
7 |
8 | Authors: Chris Ottrey, Joao Damas
9 |
10 | +html+ <DL COMPACT>
11 | +html+ <DT>Online References:
12 | +html+ <DD><UL>
13 | +html+ <LI>Based on <A HREF="http://iii.ripe.net/dbase/coding/new.code/progress/ottrey/code/java/src/DBServer.java">DBServer.java</A>
14 | +html+ </UL>
15 | +html+ </DL>
16 |
17 | ******************/ /******************
18 | Modification History:
19 | ottrey (02/03/1999) Created.
20 | ottrey (08/03/1999) Modified.
21 | joao (22/06/1999) Modified.
22 | ******************/ /******************
23 | Copyright (c) 1999 RIPE NCC
24 |
25 | All Rights Reserved
26 |
27 | Permission to use, copy, modify, and distribute this software and its
28 | documentation for any purpose and without fee is hereby granted,
29 | provided that the above copyright notice appear in all copies and that
30 | both that copyright notice and this permission notice appear in
31 | supporting documentation, and that the name of the author not be
32 | used in advertising or publicity pertaining to distribution of the
33 | software without specific, written prior permission.
34 |
35 | THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
36 | ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS; IN NO EVENT SHALL
37 | AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
38 | DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
39 | AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
40 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
41 | ***************************************/
42 | #include <sys/socket.h>
43 | #include <netinet/in.h>
44 |
45 | #include <sys/wait.h>
46 | #include <ctype.h>
47 |
48 | #include <sys/types.h>
49 | #include <sys/stat.h>
50 |
51 | #include "thread.h"
52 | #include "rxroutines.h"
53 | #include "socket.h"
54 | /*
55 | #include "objects.h"
56 | */
57 | #include "constants.h"
58 |
59 | #include "ca_configFns.h"
60 | #include "ca_dictSyms.h"
61 | #include "ca_macros.h"
62 | #include "ca_srcAttribs.h"
63 |
64 | #include "mysql_driver.h"
65 | #include "access_control.h"
66 | #include "ud.h"
67 | #include "server.h"
68 |
69 | #include "rp.h"
70 | #include "memwrap.h"
71 |
72 | #include "ta.h"
73 |
74 | #define RIPE_REG 17
75 |
76 | /*+ String sizes +*/
77 | #define STR_S 63
78 | #define STR_M 255
79 | #define STR_L 1023
80 | #define STR_XL 4095
81 | #define STR_XXL 16383
82 |
83 |
84 | /* Storage for descriptors of the read side of the pipe */
85 | int sv_lockfd[MAX_LOCKS];
86 |
87 | /* Listening sockets */
88 | int SV_whois_sock;
89 | int SV_config_sock;
90 | int SV_mirror_sock;
91 |
92 | /* each updatable source has its own update thread and its own socket */
93 | #define MAX_SOURCES 100
94 | int SV_update_sock[MAX_SOURCES];
95 |
96 | /*+ Mutex lock. Used for synchronizing changes. +*/
97 | pthread_mutex_t Whois_thread_count_lock;
98 | pthread_mutex_t Config_thread_count_lock;
99 | pthread_mutex_t Mirror_thread_count_lock;
100 |
101 | /*+ The number of threads. +*/
102 | int Whois_thread_count;
103 | int Config_thread_count;
104 | int Mirror_thread_count;
105 |
106 |
107 | /*+ Server starting time +*/
108 | time_t SV_starttime;
109 |
110 | /* pthread_mutex_t radix_initializing_lock; */
111 | /* XXX this is a workaround of a problem with mysql - it prevents the
112 | update/nrtm threads from starting before the radix tree is loaded.
113 |
114 | Apparently, even LOCK TABLES doesn't prevent the program from locking up
115 | */
116 |
117 | static void do_watchdog(void *arg);
118 |
119 | /* Logging results */
120 | static void log_print(const char *arg) {
121 |
122 | printf(arg);
123 |
124 | } /* log_print() */
125 |
126 |
127 | void radix_init(void){
128 | int i;
129 | ca_dbSource_t *source_hdl;
130 |
131 | wr_log_set(0);
132 | /* this needs to be done in two loops,
133 | because the trees must be created asap (first loop)
134 | and then locked until they are populated in the second loop
135 | */
136 |
137 | for(i=0; (source_hdl = ca_get_SourceHandleByPosition(i))!=NULL ; i++){
138 | dieif( RP_init_trees( source_hdl ) != RP_OK );
139 | }
140 |
141 | for(i=0; (source_hdl = ca_get_SourceHandleByPosition(i))!=NULL ; i++){
142 | dieif( RP_sql_load_reg( source_hdl ) != RP_OK );
143 | }
144 |
145 | #if 0
146 | {
147 | er_path_t erlogstr;
148 |
149 | erlogstr.fdes = stdout;
150 | erlogstr.asp = 0xfffff000;
151 | erlogstr.fac = 0; /* FAC_SQ; */
152 | erlogstr.sev = ER_SEV_D;
153 | erlogstr.mode = ER_M_SEVCHAR | ER_M_FACSYMB | ER_M_TEXTLONG;
154 |
155 | ER_setpath(& erlogstr);
156 | }
157 | #endif
158 | wr_log_set(0); /* switch on/off the memory leak detector */
159 | /* pthread_mutex_unlock( &radix_initializing_lock ); */
160 |
161 | pthread_exit((void *)0);
162 | }
163 |
164 | /* main_loop() */
165 | /*++++++++++++++++++++++++++++++++++++++
166 |
167 | Waits for an incoming connection on the and spawns a new thread to handle it.
168 |
169 | void *arg Pointer to a struct containing the socket to talk to the client and
170 | the function to call depending on the incoming connection.
171 |
172 | More:
173 | +html+ <PRE>
174 | Author:
175 | ottrey
176 | joao
177 | andrei (do_server)
178 | +html+ </PRE>
179 | ++++++++++++++++++++++++++++++++++++++*/
180 | static void *main_loop(void *arg) {
181 | th_args *args = (th_args *)arg;
182 | int connected_socket;
183 | int do_server;
184 |
185 | while(do_server=CO_get_do_server()) {
186 |
187 | connected_socket = SK_accept_connection(args->sock);
188 | if(connected_socket==-1) break;
189 |
190 |
191 | ER_dbg_va(FAC_TH, ASP_TH_NEW, "Starting a new thread");
192 |
193 | /* Start a new thread. */
194 |
195 |
196 | TH_create((void *(*)(void *))(args->function), (void *)connected_socket);
197 | //
198 | // pthread_attr_init(&attr); /* initialize attr with default attributes */
199 | // pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
200 | // pthread_create(&tid, &attr, (void *(*)(void *))(args->function), (void *)connected_socket);
201 | }
202 |
203 | ER_dbg_va(FAC_TH, ASP_TH_NEW, "Exiting from the main loop");
204 |
205 | } /* main_loop() */
206 |
207 |
208 | /* SV_start() */
209 | /*++++++++++++++++++++++++++++++++++++++
210 |
211 | Start the server.
212 |
213 | More:
214 | +html+ <PRE>
215 | Authors:
216 | ottrey
217 | joao
218 | +html+ </PRE>
219 | +html+ Starts up the server.
220 | +html+ <OL>
221 | +html+ <LI> Create sockets on the necessary ports (whois, config and mirror)
222 | +html+ <LI> Start new threads for each service.
223 | +html+ </OL>
224 | +html+ <A HREF=".DBrc">.properties</A>
225 |
226 | ++++++++++++++++++++++++++++++++++++++*/
227 | void SV_start() {
228 | /* Make listening sockets global variables */
229 | /* int whois_sock,config_sock,mirror_sock,update_sock; */
230 | /* uint32_t whois_addr,sock_addr,mirror_addr; */
231 | int whois_port = -1;
232 | int config_port = -1;
233 | int mirror_port = -1;
234 | int update_port = -1;
235 | int update_mode = 0;
236 | sigset_t sset;
237 | int fdes[2];
238 | struct timeval tval;
239 | ca_dbSource_t *source_hdl;
240 | char *source_name;
241 | int source;
242 |
243 | /* Store the starting time */
244 | gettimeofday(&tval, NULL);
245 | SV_starttime = tval.tv_sec;/* seconds since Jan. 1, 1970 */
246 |
247 | /* Create interrupt pipe */
248 | /* Writing to this pipe will cause sleeping threads */
249 | /* to wake up */
250 | fprintf(stderr, "Creating an interrupt pipe\n");
251 | if(pipe(fdes)==-1) {
252 | printf("Cannot open interrupt pipe\n");
253 | exit(-1);
254 | }
255 | /* Save the pipe descriptors in sv_lock array */
256 | sv_lockfd[WLOCK_SHTDOWN]=fdes[0];
257 | sv_lockfd[LOCK_SHTDOWN]=fdes[1];
258 |
259 |
260 | /* Initialise the access control list. */
261 | AC_build();
262 | AC_acc_load();
263 | /* explicitly start the decay thread */
264 | TH_create((void *(*)(void *))AC_decay, NULL);
265 |
266 | /* Initialise the radix tree (separate thread[s])
267 | already can allow socket connections, because the trees will
268 | be created locked, and will be unlocked when loaded */
269 |
270 | /* pthread_mutex_lock( &radix_initializing_lock ); */
271 | TH_create((void *(*)(void *))radix_init, NULL);
272 | /* pthread_mutex_lock( &radix_initializing_lock ); */
273 |
274 |
275 | /* XXX I have no idea how this is working!! It's wrong! - ottrey 30/7/99 */
276 | /* Get port information for each service */
277 | whois_port = SK_atoport(CO_get_whois_port(), "tcp");
278 | printf("XXX htons(whois_port)=%d\n", htons(whois_port));
279 | if(whois_port == -1) {
280 | printf("Invalid service/port: %d\n", htons(whois_port));
281 | exit(-1);
282 | }
283 |
284 | /* XXX I have no idea how this is working!! It's wrong! - ottrey 30/7/99 */
285 | config_port = SK_atoport(CO_get_config_port(), "tcp");
286 | printf("XXX htons(config_port)=%d\n", htons(config_port));
287 | if(config_port == -1) {
288 | printf("Invalid service/port: %d\n", htons(config_port));
289 | exit(-1);
290 | }
291 | mirror_port = SK_atoport(CO_get_mirror_port(), "tcp");
292 | printf("XXX htons(mirror_port)=%d\n", htons(mirror_port));
293 | if(mirror_port == -1) {
294 | printf("Invalid service/port: %d\n", mirror_port);
295 | exit(-1);
296 | }
297 |
298 | /* XXX I have no idea how this is working!! It's wrong! - ottrey 30/7/99 */
299 | /* update_port = SK_atoport(CO_get_update_port(), "tcp"); */
300 | /* printf("XXX htons(update_port)=%d\n", htons(update_port)); */
301 | /* if(update_port == -1) { */
302 | /* printf("Invalid service/port: %d\n", htons(update_port)); */
303 | /* exit(-1); */
304 | /* } */
305 |
306 |
307 |
308 | /* 6. Create a socket on the necessary ports/addresses and bind to them. */
309 | /* whois socket */
310 | SV_whois_sock = SK_getsock(SOCK_STREAM, whois_port, INADDR_ANY);
311 | /* Currently binds to INADDR_ANY. Will need to get specific address */
312 | /* SV_whois_sock = SK_getsock(SOCK_STREAM,whois_port,whois_addr); */
313 | /* config interface socket */
314 | SV_config_sock = SK_getsock(SOCK_STREAM, config_port, INADDR_ANY);
315 | /* nrt socket */
316 | SV_mirror_sock = SK_getsock(SOCK_STREAM,mirror_port,INADDR_ANY);
317 |
318 |
319 |
320 | /* update interface socket */
321 | /* we need first to create and bind all of them */
322 | /* so that in case of failure we do not start any */
323 | /* update thread */
324 | for(source=0; (source_hdl = ca_get_SourceHandleByPosition(source))!=NULL ; source++){
325 | update_mode = ca_get_srcmode(source_hdl);
326 | if(IS_UPDATE(update_mode)) {
327 | /* update_port = SK_atoport(CO_get_update_port(), "tcp"); */
328 | update_port = htons(ca_get_srcupdateport(source_hdl));
329 | printf("XXX htons(update_port)=%d\n", htons(update_port));
330 | /* XXX ask AMRM to change the name of the function */
331 |
332 | SV_update_sock[source] = SK_getsock(SOCK_STREAM, update_port, INADDR_ANY);
333 | }
334 | else SV_update_sock[source] = 0;
335 | }
336 | SV_update_sock[source+1]=-1; /* end of socket array */
337 |
338 | /* Now.... accept() calls block until they get a connection
339 | so to listen on more than one port we need more
340 | than one thread */
341 |
342 | /* Create master thread for whois threads */
343 | SV_concurrent_server(SV_whois_sock, SV_do_whois);
344 |
345 | /* Create master thread for config threads */
346 | SV_concurrent_server(SV_config_sock, SV_do_config);
347 | /* Create master thread for mirror threads */
348 | SV_concurrent_server(SV_mirror_sock, SV_do_mirror);
349 |
350 | /* Walk through the sources and */
351 | /* run update thread for every source with CANUPD == 'y' */
352 |
353 | for(source=0; (source_hdl = ca_get_SourceHandleByPosition(source))!=NULL ; source++){
354 | update_mode = ca_get_srcmode(source_hdl);
355 | source_name= ca_get_srcname(source_hdl);
356 |
357 | if(IS_UPDATE(update_mode)) {
358 | /* run RIPupdate thread */
359 | fprintf(stderr,"Source [%s] Mode UPDATE\n", source_name);
360 | TH_create((void *(*)(void *))UD_do_updates, (void *)source);
361 | }
362 | else {
363 | /* start NRTM client */
364 | fprintf(stderr,"Source [%s] Mode NRTM\n", source_name);
365 | TH_create((void *(*)(void *))UD_do_nrtm, (void *)source);
366 | }
367 | free(source_name); /* because ca_* functions return copies */
368 | }
369 |
370 |
371 |
372 | /* XXX Is this needed? */
373 | pthread_exit(NULL);
374 |
375 | } /* SV_start() */
376 |
377 | /* SV_shutdown() */
378 | /*++++++++++++++++++++++++++++++++++++++
379 |
380 | Shutdown the server.
381 |
382 | More:
383 | +html+ <PRE>
384 | Authors:
385 | andrei
386 | +html+ </PRE>
387 | +html+ Stops the server.
388 | +html+ <OL>
389 | +html+ <LI> Close listening sockets (whois, config, mirror and updates)
390 | +html+ <LI> Stop all threads by triggering do_server variable.
391 | +html+ </OL>
392 | +html+ <A HREF=".DBrc">.properties</A>
393 |
394 | ++++++++++++++++++++++++++++++++++++++*/
395 | void SV_shutdown() {
396 | char print_buf[STR_M];
397 | int source;
398 |
399 | sprintf(print_buf, "%d", 0);
400 | /* Stop updates */
401 | CO_set_const("UD.do_update", print_buf);
402 | /* Stop all servers */
403 | CO_set_const("SV.do_server", print_buf);
404 | sprintf(print_buf, "Stopping all servers\n");
405 | fprintf(stderr, print_buf);
406 | /*log_print(print_buf); */
407 | strcpy(print_buf, "");
408 |
409 | /* Wake up all sleeping threads */
410 | fprintf(stderr, "Going to wake sleeping threads up\n");
411 | write(sv_lockfd[WLOCK_SHTDOWN], " ", 1);
412 |
413 | /* CLose all listening sockets, so accept call exits */
414 | close(SV_whois_sock);
415 | close(SV_config_sock);
416 | close(SV_mirror_sock);
417 | for (source=0; SV_update_sock[source]!=-1; source++)
418 | if(SV_update_sock[source]!=0)close(SV_update_sock[source]);
419 |
420 |
421 | } /* SV_shutdown() */
422 |
423 |
424 | /* SV_sleep() */
425 | /*++++++++++++++++++++++++++++++++++++++
426 |
427 | Sleep and wake up on special events.
428 |
429 | More:
430 | +html+ <PRE>
431 | Authors:
432 | andrei
433 | +html+ </PRE>
434 | +html+ Sleeps timeout but wakes up when an envent occures.
435 |
436 | ++++++++++++++++++++++++++++++++++++++*/
437 | int SV_sleep(int lock, int sleeptime) {
438 | struct timeval timeout;
439 | struct stat st;
440 | fd_set set;
441 |
442 | if (fstat(sv_lockfd[lock], &st) ==-1) {
443 | fprintf(stderr, "Error stat-ing the lock file\n");
444 | return(-1);
445 | }
446 |
447 | timeout.tv_sec=sleeptime;
448 | timeout.tv_usec=0;
449 |
450 | FD_ZERO(&set);
451 | FD_SET(sv_lockfd[lock], &set);
452 |
453 | fprintf(stderr, "Going to sleep\n");
454 | select(sv_lockfd[lock]+1, &set, NULL, NULL, &timeout);
455 |
456 | fprintf(stderr, "Select returned\n");
457 |
458 | return(0);
459 | }
460 |
461 | /*++++++++++++++++++++++++++++++++++++++
462 |
463 | Handle signals.
464 |
465 | Changes the flags:
466 | do_nrtm
467 | do_update
468 | do_whoisd
469 |
470 | More:
471 | +html+ <PRE>
472 | Author:
473 | andrei
474 | +html+ </PRE>
475 | ++++++++++++++++++++++++++++++++++++++*/
476 | void *SV_signal_thread() {
477 | char print_buf[STR_M];
478 | sigset_t sset;
479 | int sigReceived;
480 | int do_update;
481 |
482 | sigemptyset(&sset);
483 | sigaddset(&sset, SIGTERM);
484 | sigaddset(&sset, SIGINT);
485 | sigaddset(&sset, SIGUSR1);
486 | /* This is a bit confusing, but is needed */
487 | /* For more information on signal handling in */
488 | /* threads see for example "Multithreading Programming */
489 | /* Techniques" by Shashi Prasad, ISBN 0-07-912250-7, pp. 94-101 */
490 | pthread_sigmask(SIG_BLOCK, &sset, NULL);
491 | /* fprintf(stderr, "Signal handler installed\n");*/
492 |
493 | for(;;)
494 | {
495 | sigwait(&sset, &sigReceived);
496 | sprintf(print_buf, "Signal received [%d]\n", sigReceived);
497 | log_print(print_buf); strcpy(print_buf, "");
498 | /* fprintf(stderr, "Signal received [%d]\n", sigReceived); */
499 | switch (sigReceived)
500 | {
501 | case SIGINT:
502 | /* SIGINT stops all servers */
503 | SV_shutdown();
504 | pthread_exit((void *)0);
505 | break;
506 |
507 | case SIGTERM:
508 | /* SIGTERM will switch the updates on and off */
509 | do_update=CO_get_do_update();
510 | if(do_update)do_update=0; else do_update=1;
511 | sprintf(print_buf, "%d", do_update);
512 | CO_set_const("UD.do_update", print_buf);
513 | if(do_update)
514 | sprintf(print_buf, "Starting updates\n");
515 | else
516 | sprintf(print_buf, "Stopping updates\n");
517 | log_print(print_buf); strcpy(print_buf, "");
518 | /* fprintf(stderr, "Stopping updates (SIGTERM received)\n"); */
519 | break;
520 | }
521 | }
522 | } /* SV_signal_thread() */
523 |
524 | /* SV_concurrent_server() */
525 | /*++++++++++++++++++++++++++++++++++++++
526 |
527 | This is the routine that creates the main threads.
528 |
529 | int sock The socket to connect to.
530 | void * do_function The function to call for each type of service
531 |
532 | More:
533 | +html+ <PRE>
534 | Author:
535 | ottrey
536 | joao
537 | +html+ </PRE>
538 | ++++++++++++++++++++++++++++++++++++++*/
539 | void SV_concurrent_server(int sock, void *do_function(void *)) {
540 | th_args *args;
541 | pthread_t tid;
542 | pthread_attr_t attr;
543 |
544 | dieif( wr_calloc((void **)&args,1,sizeof(th_args)) != UT_OK);
545 |
546 | args->function=(void *)do_function;
547 | args->sock=sock;
548 |
549 | /* pthread_mutex_init(&Whois_thread_count_lock,NULL); */
550 |
551 | /* Start a new thread. */
552 |
553 | TH_create(main_loop, (void *)args);
554 |
555 |
556 | /* Start a new thread. */
557 | // pthread_attr_init(&attr); /* initialize attr with default attributes */
558 | // pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
559 | // pthread_create(&tid, &attr, main_thread, (void *)args);
560 |
561 | } /* TH_run() */
562 |
563 | /* SV_do_whois() */
564 | /*++++++++++++++++++++++++++++++++++++++
565 |
566 | Handle whois connections.
567 |
568 | void *arg The socket to connect to. (It has to be passed in this way for this thread routine.)
569 |
570 | More:
571 | +html+ <PRE>
572 | Author:
573 | joao
574 | +html+ </PRE>
575 | ++++++++++++++++++++++++++++++++++++++*/
576 | void *SV_do_whois(void *arg) {
577 | int sock = (int)arg;
578 |
579 | ER_dbg_va(FAC_TH, ASP_TH_NEW,
580 | "Whois: Child thread [%d]: Socket number = %d",
581 | pthread_self(), sock);
582 |
583 | /* Use a mutex to update the global whois thread counter. */
584 | pthread_mutex_lock(&Whois_thread_count_lock);
585 | Whois_thread_count++;
586 | ER_dbg_va(FAC_TH, ASP_TH_NEW,
587 | "Whois_thread_count++=%d", Whois_thread_count);
588 |
589 | pthread_mutex_unlock(&Whois_thread_count_lock);
590 |
591 | TA_add(sock, "whois");
592 | PW_interact(sock);
593 | TA_delete();
594 |
595 | /* Use a mutex to update the global whois thread counter. */
596 | pthread_mutex_lock(&Whois_thread_count_lock);
597 | Whois_thread_count--;
598 | ER_dbg_va(FAC_TH, ASP_TH_NEW,
599 | "Whois_thread_count--=%d", Whois_thread_count);
600 | pthread_mutex_unlock(&Whois_thread_count_lock);
601 |
602 | pthread_exit((void *)0);
603 |
604 | } /* SV_do_whois() */
605 |
606 | /* SV_do_mirror() */
607 | /*++++++++++++++++++++++++++++++++++++++
608 |
609 | Handle NRTM connections.
610 |
611 | void *arg The socket to connect to. (It has to be passed in this way for this thread routine.)
612 |
613 | More:
614 | +html+ <PRE>
615 | Author:
616 | joao
617 | +html+ </PRE>
618 | ++++++++++++++++++++++++++++++++++++++*/
619 | void *SV_do_mirror(void *arg) {
620 | int sock = (int)arg;
621 | char print_buf[STR_M];
622 |
623 | sprintf(print_buf, "NRTM: Child thread [%d]: Socket number = %d\n", pthread_self(), sock); log_print(print_buf); strcpy(print_buf, "");
624 |
625 | /* Use a mutex to update the global mirror thread counter. */
626 | pthread_mutex_lock(&Mirror_thread_count_lock);
627 | Mirror_thread_count++;
628 | sprintf(print_buf, "Mirror_thread_count++=%d\n", Mirror_thread_count); log_print(print_buf); strcpy(print_buf, "");
629 | pthread_mutex_unlock(&Mirror_thread_count_lock);
630 |
631 | TA_add(sock, "mirror");
632 | PM_interact(sock);
633 | TA_delete();
634 |
635 | /* Use a mutex to update the global mirror thread counter. */
636 | pthread_mutex_lock(&Mirror_thread_count_lock);
637 | Mirror_thread_count--;
638 | sprintf(print_buf, "Mirror_thread_count--=%d\n", Mirror_thread_count); log_print(print_buf); strcpy(print_buf, "");
639 | pthread_mutex_unlock(&Mirror_thread_count_lock);
640 |
641 | pthread_exit((void *)0);
642 |
643 | } /* SV_do_mirror() */
644 |
645 | /* SV_do_config() */
646 | /*++++++++++++++++++++++++++++++++++++++
647 |
648 | Handle config connections.
649 |
650 | void *arg The socket to connect to. (It has to be passed in this way for this
651 | thread routine.)
652 |
653 | More:
654 | +html+ <PRE>
655 | Author:
656 | joao
657 | +html+ </PRE>
658 | ++++++++++++++++++++++++++++++++++++++*/
659 | void *SV_do_config(void *arg) {
660 | int sock = (int)arg;
661 | char print_buf[STR_M];
662 |
663 | sprintf(print_buf, "Config: Child thread [%d]: Socket number = %d\n", pthread_self(), sock); log_print(print_buf); strcpy(print_buf, "");
664 |
665 | /*
666 | printf("Hi there, there is nothing to configure yet\nBye..... :-)\n");
667 | fflush(NULL);
668 |
669 | SK_close(sock);
670 | */
671 | TA_add(sock, "config");
672 | PC_interact(sock);
673 | TA_delete();
674 |
675 | pthread_exit((void *)0);
676 |
677 | } /* SV_do_config() */
678 |
679 |
680 | /*++++++++++++++++++++++++++++++++++++++
681 |
682 | This is the routine that creates a watchdog thread.
683 |
684 | The watchdog will cancel (pthread_cancel()) the calling thread in case the
685 | socket is closed by the client (its read-half is closed). The calling
686 | thread should make necessaruy preparations when calling the watchdog:
687 |
688 | - the socket should be connected
689 | - cancellation points and cleanup routines should be defined
690 |
691 | In case the connection is closed by the calling thread itself, the
692 | watchdog just exits and no action against the calling thread is performed.
693 |
694 | wd_args - a pointer to wd_args_t structure containing
695 | data about socket and thread ID
696 |
697 | More:
698 | +html+ <PRE>
699 | Author:
700 | ottrey
701 | joao
702 | andrei
703 | +html+ </PRE>
704 | ++++++++++++++++++++++++++++++++++++++*/
705 |
706 | void SV_watchdog(wd_args_t *wd_args) {
707 | pthread_t tid;
708 | pthread_attr_t attr;
709 |
710 | /* Start a new thread. */
711 | TH_create((void *(*)(void *))do_watchdog, (void *)wd_args);
712 |
713 | // pthread_attr_init(&attr); /* initialize attr with default attributes */
714 | // pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
715 | // pthread_create(&tid, &attr, (void *(*)(void *))do_watchdog, (void *)wd_args);
716 |
717 | }
718 |
719 |
720 | /*++++++++++++++++++++++++++++++++++++++
721 |
722 | The watchdog thread itself
723 |
724 | The watchdog thread makes select() on the connected socket waiting until it
725 | becomes readable. If this happens as a result of some input, it'll simply
726 | dump it. Otherwise, this indicates that the client has closed the
727 | connection. In this case watchdog will cancel (pthread_cancel()) the whois
728 | thread (which in its turn will kill (mysql_kill()) mysql thread as part of
729 | its cleanup routine).
730 |
731 | More:
732 | +html+ <PRE>
733 | Author:
734 | andrei
735 | +html+ </PRE>
736 | ++++++++++++++++++++++++++++++++++++++*/
737 | static void do_watchdog(void *arg) {
738 | wd_args_t *wd_args = (wd_args_t *)arg;
739 | int socket;
740 | pthread_t tid;
741 | int nready;
742 | int n;
743 | fd_set rset;
744 | char buff[STR_S];
745 |
746 | socket = wd_args->connected_socket;
747 | tid = wd_args->tid;
748 |
749 |
750 | FD_ZERO(&rset);
751 | FD_SET(socket, &rset);
752 |
753 | while ((nready=select(socket+1, &rset, NULL, NULL, NULL))!=-1) {
754 |
755 | /* There was some input or client half of connection was closed */
756 | /* Check for the latter */
757 | if (( n=read(socket, buff, sizeof(buff))) == 0) {
758 | /* Connection was closed by client */
759 | /* Now send a cancellation request to the whois thread. */
760 | /* mysql thread will be terminated by thread cleanup routine */
761 |
762 | /* The only possible error is ESRCH, so we do not care about */
763 | pthread_cancel(tid);
764 |
765 | /* Exit the watchdog thread, passing NULL as we don't expect pthread_join() */
766 | pthread_exit(NULL);
767 | }
768 |
769 | /* Otherwise dump input and continue */
770 | }
771 |
772 | /* the only reason that we are here is that the socket has been */
773 | /* closed by the whois thread and not valid. Just exit the watchdog, */
774 | /* passing NULL as we don't expect pthread_join() */
775 | pthread_exit(NULL);
776 |
777 | }