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