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  | }