git.sur5r.net Git - openldap/blob - servers/slapd/daemon.c

   1 #include "portable.h"
   2
   3 #include <stdio.h>
   4
   5 #include <ac/ctype.h>
   6 #include <ac/errno.h>
   7 #include <ac/signal.h>
   8 #include <ac/socket.h>
   9 #include <ac/string.h>
  10 #include <ac/time.h>
  11 #include <ac/unistd.h>
  12
  13 #include "ldapconfig.h"
  14 #include "slap.h"
  15
  16 #ifdef HAVE_TCPD
  17 #include <tcpd.h>
  18
  19 int allow_severity = LOG_INFO;
  20 int deny_severity = LOG_NOTICE;
  21 #endif /* TCP Wrappers */
  22
  23 /* globals */
  24 int dtblsize;
  25
  26 static ldap_pvt_thread_t        listener_tid;
  27 static volatile sig_atomic_t slapd_shutdown = 0;
  28
  29 struct slap_daemon {
  30         ldap_pvt_thread_mutex_t sd_mutex;
  31
  32         int sd_nactives;
  33
  34 #ifndef HAVE_WINSOCK
  35         /* In winsock, accept() returns values higher than dtblsize
  36                 so don't bother with this optimization */
  37         int sd_nfds;
  38 #endif
  39
  40         fd_set sd_actives;
  41         fd_set sd_readers;
  42         fd_set sd_writers;
  43 } slap_daemon;
  44
  45 /*
  46  * Add a descriptor to daemon control
  47  */
  48 static void slapd_add(int s) {
  49         ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );
  50
  51         assert( !FD_ISSET( s, &slap_daemon.sd_actives ));
  52         assert( !FD_ISSET( s, &slap_daemon.sd_readers ));
  53         assert( !FD_ISSET( s, &slap_daemon.sd_writers ));
  54
  55 #ifndef HAVE_WINSOCK
  56         if (s >= slap_daemon.sd_nfds) {
  57                 slap_daemon.sd_nfds = s + 1;
  58         }
  59 #endif
  60
  61         FD_SET( s, &slap_daemon.sd_actives );
  62         FD_SET( s, &slap_daemon.sd_readers );
  63
  64         Debug( LDAP_DEBUG_CONNS, "daemon: added %d%s%s\n", s,
  65             FD_ISSET(s, &slap_daemon.sd_readers) ? "r" : "",
  66                 FD_ISSET(s, &slap_daemon.sd_writers) ? "w" : "" );
  67
  68         ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );
  69 }
  70
  71 /*
  72  * Remove the descriptor from daemon control
  73  */
  74 void slapd_remove(int s) {
  75         ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );
  76
  77         assert( FD_ISSET( s, &slap_daemon.sd_actives ));
  78
  79         Debug( LDAP_DEBUG_CONNS, "daemon: removing %d%s%s\n", s,
  80             FD_ISSET(s, &slap_daemon.sd_readers) ? "r" : "",
  81                 FD_ISSET(s, &slap_daemon.sd_writers) ? "w" : "" );
  82
  83         FD_CLR( s, &slap_daemon.sd_actives );
  84         FD_CLR( s, &slap_daemon.sd_readers );
  85         FD_CLR( s, &slap_daemon.sd_writers );
  86
  87         ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );
  88 }
  89
  90 void slapd_clr_write(int s, int wake) {
  91         ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );
  92
  93         assert( FD_ISSET( s, &slap_daemon.sd_actives) );
  94         FD_CLR( s, &slap_daemon.sd_writers );
  95
  96         ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );
  97
  98         if( wake ) {
  99                 ldap_pvt_thread_kill( listener_tid, LDAP_SIGUSR1 );
 100         }
 101 }
 102
 103 void slapd_set_write(int s, int wake) {
 104         ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );
 105
 106         assert( FD_ISSET( s, &slap_daemon.sd_actives) );
 107         FD_SET( s, &slap_daemon.sd_writers );
 108
 109         ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );
 110
 111         if( wake ) {
 112                 ldap_pvt_thread_kill( listener_tid, LDAP_SIGUSR1 );
 113         }
 114 }
 115
 116 void slapd_clr_read(int s, int wake) {
 117         ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );
 118
 119         assert( FD_ISSET( s, &slap_daemon.sd_actives) );
 120         FD_CLR( s, &slap_daemon.sd_readers );
 121
 122         ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );
 123
 124         if( wake ) {
 125                 ldap_pvt_thread_kill( listener_tid, LDAP_SIGUSR1 );
 126         }
 127 }
 128
 129 void slapd_set_read(int s, int wake) {
 130         ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );
 131
 132         assert( FD_ISSET( s, &slap_daemon.sd_actives) );
 133         FD_SET( s, &slap_daemon.sd_readers );
 134
 135         ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );
 136
 137         if( wake ) {
 138                 ldap_pvt_thread_kill( listener_tid, LDAP_SIGUSR1 );
 139         }
 140 }
 141
 142 static void slapd_close(int s) {
 143         slapd_remove(s);
 144
 145         Debug( LDAP_DEBUG_CONNS, "daemon: closing %d\n", s, 0, 0 );
 146         tcp_close(s);
 147 }
 148
 149 static void *
 150 slapd_daemon_task(
 151         void *ptr
 152 )
 153 {
 154         struct sockaddr_in *addr = ptr;
 155         int     tcps = -1;
 156
 157 #ifdef HAVE_SYSCONF
 158         dtblsize = sysconf( _SC_OPEN_MAX );
 159 #elif HAVE_GETDTABLESIZE
 160         dtblsize = getdtablesize();
 161 #else
 162         dtblsize = FD_SETSIZE;
 163 #endif
 164
 165 #ifdef FD_SETSIZE
 166         if(dtblsize > FD_SETSIZE) {
 167                 dtblsize = FD_SETSIZE;
 168         }
 169 #endif  /* !FD_SETSIZE */
 170
 171 #ifdef HAVE_WINSOCK
 172         {
 173                 WORD    vers = MAKEWORD( 2, 0);
 174                 int     err;
 175                 WSADATA wsaData;
 176                 err = WSAStartup( vers, &wsaData );
 177         }
 178 #endif
 179
 180         connections_init();
 181
 182         ldap_pvt_thread_mutex_init( &slap_daemon.sd_mutex );
 183         FD_ZERO( &slap_daemon.sd_readers );
 184         FD_ZERO( &slap_daemon.sd_writers );
 185
 186         if( addr != NULL ) {
 187                 int     tmp;
 188
 189                 if ( (tcps = socket( AF_INET, SOCK_STREAM, 0 )) == -1 ) {
 190                         Debug( LDAP_DEBUG_ANY,
 191                                 "daemon: socket() failed errno %d (%s)", errno,
 192                         errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 193                         "unknown", 0 );
 194                         exit( 1 );
 195                 }
 196
 197 #ifndef HAVE_WINSOCK
 198                 if ( tcps >= dtblsize ) {
 199                         Debug( LDAP_DEBUG_ANY,
 200                                 "daemon: listener descriptor %d is too great",
 201                                 tcps, dtblsize, 0 );
 202                         exit( 1 );
 203                 }
 204 #endif
 205
 206                 tmp = 1;
 207                 if ( setsockopt( tcps, SOL_SOCKET, SO_REUSEADDR,
 208                         (char *) &tmp, sizeof(tmp) ) == -1 )
 209                 {
 210                         Debug( LDAP_DEBUG_ANY,
 211                                 "slapd(%d): setsockopt() failed errno %d (%s)",
 212                         tcps, errno,
 213                                 errno > -1 && errno < sys_nerr
 214                                         ? sys_errlist[errno] : "unknown" );
 215
 216                         errno = 0;
 217                 }
 218
 219                 if ( bind( tcps, (struct sockaddr *) addr, sizeof(*addr) ) == -1 ) {
 220                         Debug( LDAP_DEBUG_ANY, "daemon: bind(%d) failed errno %d (%s)\n",
 221                         tcps, errno,
 222                                 errno > -1 && errno < sys_nerr
 223                                         ? sys_errlist[errno] : "unknown" );
 224                         exit( 1 );
 225                 }
 226
 227                 if ( listen( tcps, 5 ) == -1 ) {
 228                         Debug( LDAP_DEBUG_ANY,
 229                                 "daemon: listen(%d, 5) failed errno %d (%s)\n",
 230                             tcps, errno,
 231                                 errno > -1 && errno < sys_nerr
 232                                         ? sys_errlist[errno] : "unknown" );
 233                         exit( 1 );
 234                 }
 235
 236                 slapd_add( tcps );
 237
 238         } else {
 239                 if( connection_init( 0, NULL, NULL ) ) {
 240                         Debug( LDAP_DEBUG_ANY,
 241                                 "connection_init(%d) failed.\n",
 242                                 0, 0, 0 );
 243
 244                         exit( 1 );
 245                 }
 246
 247                 slapd_add( 0 );
 248         }
 249
 250         while ( !slapd_shutdown ) {
 251                 int i, ns, nfds;
 252
 253                 fd_set                  readfds;
 254                 fd_set                  writefds;
 255
 256                 struct sockaddr_in      from;
 257                 struct hostent          *hp;
 258                 struct timeval          zero;
 259                 struct timeval          *tvp;
 260
 261                 char    *client_name;
 262                 char    *client_addr;
 263
 264                 FD_ZERO( &writefds );
 265                 FD_ZERO( &readfds );
 266
 267                 zero.tv_sec = 0;
 268                 zero.tv_usec = 0;
 269
 270                 ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );
 271
 272 #ifdef FD_SET_MANUAL_COPY
 273                 for( s = 0; s < nfds; s++ ) {
 274                         if(FD_ISSET( &slap_sd_writers, s )) {
 275                                 FD_SET( &writefds, s );
 276                         }
 277                         if(FD_ISSET( &slap_sd_writers, s )) {
 278                                 FD_SET( &writefds, s );
 279                         }
 280                 }
 281 #else
 282                 memcpy( &readfds, &slap_daemon.sd_readers, sizeof(fd_set) );
 283                 memcpy( &writefds, &slap_daemon.sd_writers, sizeof(fd_set) );
 284 #endif
 285
 286                 FD_SET( tcps, &readfds );
 287
 288 #ifndef HAVE_WINSOCK
 289                 nfds = slap_daemon.sd_nfds;
 290 #else
 291                 nfds = dtblsize;
 292 #endif
 293
 294                 ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );
 295
 296                 ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 297 #if defined( HAVE_YIELDING_SELECT ) || defined( NO_THREADS )
 298                 tvp = NULL;
 299 #else
 300                 tvp = active_threads ? &zero : NULL;
 301 #endif
 302
 303                 Debug( LDAP_DEBUG_CONNS,
 304                         "daemon: select: tcps=%d active_threads=%d tvp=%s\n",
 305                     tcps, active_threads,
 306                         tvp == NULL ? "NULL" : "zero" );
 307
 308
 309                 ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 310
 311                 switch(ns = select( nfds, &readfds, &writefds, 0, tvp )) {
 312                 case -1:        /* failure - try again */
 313                         if( errno != EINTR ) {
 314                                 Debug( LDAP_DEBUG_CONNS,
 315                                         "daemon: select failed (%d): %s\n",
 316                                         errno,
 317                                         errno >= 0 && errno < sys_nerr
 318                                                 ? sys_errlist[errno] : "unknown",
 319                                         0 );
 320
 321                                 slapd_shutdown = -1;
 322                         }
 323                         errno = 0;
 324                         continue;
 325
 326                 case 0:         /* timeout - let threads run */
 327                         Debug( LDAP_DEBUG_CONNS, "daemon: select timeout - yielding\n",
 328                             0, 0, 0 );
 329                 ldap_pvt_thread_yield();
 330                         continue;
 331
 332                 default:        /* something happened - deal with it */
 333                         Debug( LDAP_DEBUG_CONNS, "daemon: activity on %d descriptors\n",
 334                                 ns, 0, 0 );
 335                         /* FALL THRU */
 336                 }
 337
 338                 if ( FD_ISSET( tcps, &readfds ) ) {
 339                         int s;
 340                         int len = sizeof(from);
 341                         long id;
 342
 343                         if ( (s = accept( tcps,
 344                                 (struct sockaddr *) &from, &len )) == -1 )
 345                         {
 346                                 Debug( LDAP_DEBUG_ANY,
 347                                     "daemon: accept(%d) failed errno %d (%s)", errno,
 348                                     tcps, errno >= 0 && errno < sys_nerr ?
 349                                     sys_errlist[errno] : "unknown");
 350                                 continue;
 351                         }
 352
 353                         assert( !FD_ISSET( 0, &slap_daemon.sd_actives) );
 354                         assert( !FD_ISSET( 0, &slap_daemon.sd_readers) );
 355                         assert( !FD_ISSET( 0, &slap_daemon.sd_writers) );
 356
 357 #ifndef HAVE_WINSOCK
 358                         /* make sure descriptor number isn't too great */
 359                         if ( s >= dtblsize ) {
 360                                 Debug( LDAP_DEBUG_ANY,
 361                                         "daemon: %d beyond descriptor table size %d\n",
 362                                         s, dtblsize, 0 );
 363                                 tcp_close(s);
 364                                 continue;
 365                         }
 366 #endif
 367
 368                         Debug( LDAP_DEBUG_CONNS, "daemon: new connection on %d\n",
 369                                 s, 0, 0 );
 370
 371                         len = sizeof(from);
 372                         if ( getpeername( s, (struct sockaddr *) &from, &len ) == 0 ) {
 373                                 client_addr = inet_ntoa( from.sin_addr );
 374
 375 #if defined(SLAPD_RLOOKUPS) || defined(HAVE_TCPD)
 376                                 hp = gethostbyaddr( (char *)
 377                                     &(from.sin_addr.s_addr),
 378                                     sizeof(from.sin_addr.s_addr), AF_INET );
 379
 380                                 if(hp) {
 381                                         char *p;
 382                                         client_name = hp->h_name;
 383
 384                                         /* normalize the domain */
 385                                         for ( p = client_name; *p; p++ ) {
 386                                                 *p = TOLOWER( (unsigned char) *p );
 387                                         }
 388
 389                                 } else {
 390                                         client_name = NULL;
 391                                 }
 392 #else
 393                                 client_name = NULL;
 394 #endif
 395
 396                         } else {
 397                                 client_name = NULL;;
 398                                 client_addr = NULL;
 399                         }
 400
 401 #ifdef HAVE_TCPD
 402                         if(!hosts_ctl("slapd",
 403                                 client_name != NULL ? client_name : STRING_UNKNOWN,
 404                                 client_addr != NULL ? client_addr : STRING_UNKNOWN,
 405                                 STRING_UNKNOWN))
 406                         {
 407                                 /* DENY ACCESS */
 408                                 Statslog( LDAP_DEBUG_ANY,
 409                                  "fd=%d connection from %s (%s) denied.\n",
 410                                         s,
 411                                         client_name == NULL ? "unknown" : client_name,
 412                                         client_addr == NULL ? "unknown" : client_addr,
 413                                   0, 0 );
 414
 415                                 tcp_close(s);
 416                                 continue;
 417                         }
 418 #endif /* HAVE_TCPD */
 419
 420                         if( (id = connection_init(s, client_name, client_addr)) < 0 ) {
 421                                 Debug( LDAP_DEBUG_ANY,
 422                                         "daemon: connection_init(%d, %s, %s) failed.\n",
 423                                         s,
 424                                         client_name == NULL ? "unknown" : client_name,
 425                                         client_addr == NULL ? "unknown" : client_addr);
 426                                 tcp_close(s);
 427                                 continue;
 428                         }
 429
 430                         Statslog( LDAP_DEBUG_STATS,
 431                                 "daemon: conn=%d fd=%d connection from %s (%s) accepted.\n",
 432                                 id, s,
 433                                 client_name == NULL ? "unknown" : client_name,
 434                                 client_addr == NULL ? "unknown" : client_addr,
 435                                 0 );
 436
 437                         slapd_add( s );
 438                         continue;
 439                 }
 440
 441 #ifdef LDAP_DEBUG
 442                 Debug( LDAP_DEBUG_CONNS, "daemon: activity on:", 0, 0, 0 );
 443 #ifdef HAVE_WINSOCK
 444                 for ( i = 0; i < readfds.fd_count; i++ )
 445                 {
 446                         Debug( LDAP_DEBUG_CONNS, " %d%s", readfds.fd_array[i], "r" );
 447                 }
 448                 for ( i = 0; i < writefds.fd_count; i++ )
 449                 {
 450                         Debug( LDAP_DEBUG_CONNS, " %d%s", writefds.fd_array[i], "w" );
 451                 }
 452 #else
 453                 for ( i = 0; i < nfds; i++ ) {
 454                         int     a, r, w;
 455
 456                         r = FD_ISSET( i, &readfds );
 457                         w = FD_ISSET( i, &writefds );
 458                         if ( i != tcps && (r || w) ) {
 459                                 Debug( LDAP_DEBUG_CONNS, " %d%s%s", i,
 460                                     r ? "r" : "", w ? "w" : "" );
 461                         }
 462                 }
 463 #endif
 464                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 465 #endif
 466
 467                 /* loop through the writers */
 468 #ifdef HAVE_WINSOCK
 469                 for ( i = 0; i < writefds.fd_count; i++ ) {
 470                         if ( writefds.fd_array[i] == tcps ) {
 471                                 continue;
 472                         }
 473                         Debug( LDAP_DEBUG_CONNS,
 474                                 "daemon: signalling write waiter on %d\n",
 475                                 writefds.fd_array[i], 0, 0 );
 476                         assert( FD_ISSET( 0, &slap_daemon.sd_actives) );
 477
 478                         slapd_clr_write( writefds.fd_array[i], 0 );
 479                         if ( connection_write( writefds.fd_array[i] ) < 0 ) {
 480                                 FD_CLR( writefds.fd_array[i], &readfds );
 481                                 slapd_close( writefds.fd_array[i] );
 482                         }
 483 #else
 484                 for ( i = 0; i < nfds; i++ ) {
 485                         if ( i == tcps ) {
 486                                 continue;
 487                         }
 488                         if ( FD_ISSET( i, &writefds ) ) {
 489                                 Debug( LDAP_DEBUG_CONNS,
 490                                     "daemon: signaling write waiter on %d\n", i, 0, 0 );
 491
 492                                 assert( FD_ISSET( 0, &slap_daemon.sd_actives) );
 493
 494                                 /* clear the write flag */
 495                                 slapd_clr_write( i, 0 );
 496
 497                                 if( connection_write( i ) < 0 ) {
 498                                         FD_CLR( i, &readfds );
 499                                         slapd_close( i );
 500                                 }
 501                         }
 502 #endif
 503
 504                 }
 505 #ifdef HAVE_WINSOCK
 506                 for ( i = 0; i < readfds.fd_count; i++ ) {
 507                         if ( readfds.fd_array[i] == tcps ) {
 508                                 continue;
 509                         }
 510                         Debug ( LDAP_DEBUG_CONNS,
 511                                 "daemon: read activity on %d\n", readfds.fd_array[i], 0, 0 );
 512                         assert( FD_ISSET( readfds.fd_array[i], &slap_daemon.sd_actives) );
 513
 514                         if ( connection_read( readfds.fd_array[i] ) < 0 ) {
 515                                 slapd_close( i );
 516                         }
 517                 }
 518 #else
 519                 for ( i = 0; i < nfds; i++ ) {
 520                         if ( i == tcps ) {
 521                                 continue;
 522                         }
 523
 524                         if ( FD_ISSET( i, &readfds ) ) {
 525                                 Debug( LDAP_DEBUG_CONNS,
 526                                     "daemon: read activity on %d\n", i, 0, 0 );
 527
 528                                 assert( FD_ISSET( i, &slap_daemon.sd_actives) );
 529
 530                                 if( connection_read( i ) < 0) {
 531                                         slapd_close( i );
 532                                 }
 533                         }
 534                 }
 535 #endif
 536                 ldap_pvt_thread_yield();
 537         }
 538
 539         if( slapd_shutdown > 0 ) {
 540                 Debug( LDAP_DEBUG_TRACE,
 541                         "daemon: shutdown requested and initiated.\n",
 542                         0, 0, 0 );
 543
 544         } else if ( slapd_shutdown < 0 ) {
 545                 Debug( LDAP_DEBUG_TRACE,
 546                         "daemon: abnormal condition, shutdown initiated.\n",
 547                         0, 0, 0 );
 548         } else {
 549                 Debug( LDAP_DEBUG_TRACE,
 550                         "daemon: no active streams, shutdown initiated.\n",
 551                         0, 0, 0 );
 552         }
 553
 554         if( tcps >= 0 ) {
 555                 tcp_close( tcps );
 556         }
 557
 558         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 559         Debug( LDAP_DEBUG_ANY,
 560             "slapd shutdown: waiting for %d threads to terminate\n",
 561             active_threads, 0, 0 );
 562         while ( active_threads > 0 ) {
 563                 ldap_pvt_thread_cond_wait(&active_threads_cond, &active_threads_mutex);
 564         }
 565         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 566
 567         return NULL;
 568 }
 569
 570 int slapd_daemon( struct sockaddr_in *addr )
 571 {
 572         int status;
 573
 574         status = ldap_pvt_thread_create( &listener_tid, 0,
 575                  slapd_daemon_task, addr );
 576
 577         if ( status != 0 ) {
 578                 Debug( LDAP_DEBUG_ANY,
 579                     "listener ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
 580                 return -1;
 581         } else {
 582                 /* wait for the listener thread to complete */
 583                 ldap_pvt_thread_join( listener_tid, (void *) NULL );
 584         }
 585
 586         return 0;
 587 }
 588
 589 void
 590 slap_set_shutdown( int sig )
 591 {
 592         slapd_shutdown = 1;
 593         ldap_pvt_thread_kill( listener_tid, LDAP_SIGUSR1 );
 594
 595         /* reinstall self */
 596         (void) SIGNAL( sig, slap_set_shutdown );
 597 }
 598
 599 void
 600 slap_do_nothing( int sig )
 601 {
 602         /* reinstall self */
 603         (void) SIGNAL( sig, slap_do_nothing );
 604 }