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

   1
   2 /* Revision history
   3  *
   4  * 5-Jun-96     hodges
   5  *      Added locking of new_conn_mutex when traversing the c[] array.
   6  */
   7
   8 #include "portable.h"
   9
  10 #include <stdio.h>
  11
  12 #include <ac/ctype.h>
  13 #include <ac/errno.h>
  14 #include <ac/signal.h>
  15 #include <ac/socket.h>
  16 #include <ac/string.h>
  17 #include <ac/time.h>
  18 #include <ac/unistd.h>
  19
  20 #include "ldapconfig.h"
  21 #include "slap.h"
  22
  23 #ifdef HAVE_SYS_FILIO_H
  24 #include <sys/filio.h>
  25 #elif HAVE_SYS_IOCTL_H
  26 #include <sys/ioctl.h>
  27 #endif
  28
  29 #ifdef LDAP_DEBUG
  30 #include <assert.h>
  31 #else
  32 #define assert( cond )
  33 #endif
  34
  35 #ifdef HAVE_TCPD
  36 #include <tcpd.h>
  37
  38 int allow_severity = LOG_INFO;
  39 int deny_severity = LOG_NOTICE;
  40 #endif /* TCP Wrappers */
  41
  42 int             dtblsize;
  43 Connection      *c;
  44
  45 static volatile sig_atomic_t slapd_shutdown = 0;
  46
  47 /* a link to the slapd.conf configuration parameters */
  48 extern char *slapd_pid_file;
  49 extern char *slapd_args_file;
  50
  51 void *
  52 slapd_daemon(
  53         void *ptr
  54 )
  55 {
  56         struct sockaddr_in *addr = ptr;
  57         int                     i;
  58         int                     tcps, ns;
  59         fd_set                  readfds;
  60         fd_set                  writefds;
  61         FILE                    *fp;
  62
  63 #ifdef HAVE_SYSCONF
  64         dtblsize = sysconf( _SC_OPEN_MAX );
  65 #elif HAVE_GETDTABLESIZE
  66         dtblsize = getdtablesize();
  67 #else
  68         dtblsize = FD_SETSIZE
  69 #endif
  70
  71 #ifdef FD_SETSIZE
  72         if(dtblsize > FD_SETSIZE) {
  73                 dtblsize = FD_SETSIZE;
  74         }
  75 #endif  /* !FD_SETSIZE */
  76
  77         c = (Connection *) ch_calloc( 1, dtblsize * sizeof(Connection) );
  78
  79         for ( i = 0; i < dtblsize; i++ ) {
  80                 c[i].c_dn = NULL;
  81                 c[i].c_cdn = NULL;
  82                 c[i].c_addr = NULL;
  83                 c[i].c_domain = NULL;
  84                 c[i].c_ops = NULL;
  85                 lber_pvt_sb_init( &c[i].c_sb );
  86                 ldap_pvt_thread_mutex_init( &c[i].c_dnmutex );
  87                 ldap_pvt_thread_mutex_init( &c[i].c_opsmutex );
  88                 ldap_pvt_thread_mutex_init( &c[i].c_pdumutex );
  89                 ldap_pvt_thread_cond_init( &c[i].c_wcv );
  90         }
  91
  92         if ( (tcps = socket( AF_INET, SOCK_STREAM, 0 )) == -1 ) {
  93                 Debug( LDAP_DEBUG_ANY, "socket() failed errno %d (%s)", errno,
  94                     errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
  95                     "unknown", 0 );
  96                 exit( 1 );
  97         }
  98
  99         i = 1;
 100         if ( setsockopt( tcps, SOL_SOCKET, SO_REUSEADDR, (char *) &i,
 101             sizeof(i) ) == -1 ) {
 102                 Debug( LDAP_DEBUG_ANY, "setsockopt() failed errno %d (%s)",
 103                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 104                     "unknown", 0 );
 105         }
 106
 107         if ( bind( tcps, (struct sockaddr *) addr, sizeof(*addr) ) == -1 ) {
 108                 Debug( LDAP_DEBUG_ANY, "bind() failed errno %d (%s)\n",
 109                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 110                     "unknown", 0 );
 111                 exit( 1 );
 112         }
 113
 114         if ( listen( tcps, 5 ) == -1 ) {
 115                 Debug( LDAP_DEBUG_ANY, "listen() failed errno %d (%s)",
 116                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 117                     "unknown", 0 );
 118                 exit( 1 );
 119         }
 120
 121         Debug( LDAP_DEBUG_ANY, "slapd starting\n", 0, 0, 0 );
 122
 123         if (( slapd_pid_file != NULL ) &&
 124                         (( fp = fopen( slapd_pid_file, "w" )) != NULL )) {
 125                 fprintf( fp, "%d\n", (int) getpid() );
 126                 fclose( fp );
 127         }
 128
 129         if (( slapd_args_file != NULL ) &&
 130                         (( fp = fopen( slapd_args_file, "w" )) != NULL )) {
 131                 for ( i = 0; i < g_argc; i++ ) {
 132                         fprintf( fp, "%s ", g_argv[i] );
 133                 }
 134                 fprintf( fp, "\n" );
 135                 fclose( fp );
 136         }
 137
 138         while ( !slapd_shutdown ) {
 139                 struct sockaddr_in      from;
 140                 struct hostent          *hp;
 141                 struct timeval          zero;
 142                 struct timeval          *tvp;
 143                 int                     len;
 144                 int                     data_ready;
 145
 146                 char    *client_name;
 147                 char    *client_addr;
 148
 149                 FD_ZERO( &writefds );
 150                 FD_ZERO( &readfds );
 151                 FD_SET( tcps, &readfds );
 152
 153                 zero.tv_sec = 0;
 154                 zero.tv_usec = 0;
 155
 156                 ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 157                 Debug( LDAP_DEBUG_CONNS,
 158                     "listening for connections on %d, activity on:",
 159                     tcps, 0, 0 );
 160
 161                 data_ready = 0;
 162
 163                 ldap_pvt_thread_mutex_lock( &new_conn_mutex );
 164                 for ( i = 0; i < dtblsize; i++ ) {
 165                         if ( (c[i].c_state != SLAP_C_INACTIVE)
 166                                 && (c[i].c_state != SLAP_C_CLOSING) )
 167                         {
 168 #ifdef LDAP_DEBUG
 169                                 assert(lber_pvt_sb_in_use( &c[i].c_sb ));
 170 #endif
 171                                 FD_SET( lber_pvt_sb_get_desc(&c[i].c_sb),
 172                                         &readfds );
 173                                 if (lber_pvt_sb_data_ready(&c[i].c_sb))
 174                                         data_ready = 1;
 175                                 if ( c[i].c_writewaiter ) {
 176                                         FD_SET( lber_pvt_sb_get_desc(&c[i].c_sb),
 177                                                 &writefds );
 178                                 }
 179                                 Debug( LDAP_DEBUG_CONNS, " %dr%s", i,
 180                                     c[i].c_writewaiter ? "w" : "", 0 );
 181                         }
 182                 }
 183
 184                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 185                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 186
 187                 Debug( LDAP_DEBUG_CONNS, "before select active_threads %d\n",
 188                     active_threads, 0, 0 );
 189 #if defined( HAVE_YIELDING_SELECT ) || defined( NO_THREADS )
 190                 tvp = (data_ready) ? &zero : NULL;
 191 #else
 192                 tvp = (active_threads || data_ready) ? &zero : NULL;
 193 #endif
 194                 ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 195
 196                 switch ( i = select( dtblsize, &readfds, &writefds, 0, tvp ) ) {
 197                 case -1:        /* failure - try again */
 198                         Debug( LDAP_DEBUG_CONNS,
 199                             "select failed errno %d (%s)\n",
 200                             errno, errno > -1 && errno < sys_nerr ?
 201                             sys_errlist[errno] : "unknown", 0 );
 202                         continue;
 203
 204                 case 0:         /* timeout - let threads run */
 205                         Debug( LDAP_DEBUG_CONNS, "select timeout - yielding\n",
 206                             0, 0, 0 );
 207                         if (!data_ready)
 208                                 ldap_pvt_thread_yield();
 209                         continue;
 210
 211                 default:        /* something happened - deal with it */
 212                         Debug( LDAP_DEBUG_CONNS, "select activity on %d descriptors\n", i, 0, 0 );
 213                         ;       /* FALL */
 214                 }
 215                 ldap_pvt_thread_mutex_lock( &currenttime_mutex );
 216                 time( &currenttime );
 217                 ldap_pvt_thread_mutex_unlock( &currenttime_mutex );
 218
 219                 /* new connection */
 220                 ldap_pvt_thread_mutex_lock( &new_conn_mutex );
 221                 if ( FD_ISSET( tcps, &readfds ) ) {
 222                         len = sizeof(from);
 223                         if ( (ns = accept( tcps, (struct sockaddr *) &from,
 224                             &len )) == -1 ) {
 225                                 Debug( LDAP_DEBUG_ANY,
 226                                     "accept() failed errno %d (%s)", errno,
 227                                     errno > -1 && errno < sys_nerr ?
 228                                     sys_errlist[errno] : "unknown", 0 );
 229                                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 230                                 continue;
 231                         }
 232
 233                         /* make sure descriptor number isn't too great */
 234                         if ( ns >= dtblsize ) {
 235                                 Debug( LDAP_DEBUG_ANY,
 236                                         "new connection on %d beyond descriptor table size %d\n",
 237                                         ns, dtblsize, 0 );
 238                                 close(ns);
 239                                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 240                                 continue;
 241                         }
 242
 243                         Debug( LDAP_DEBUG_CONNS, "new connection on %d\n", ns,
 244                             0, 0 );
 245
 246                         len = sizeof(from);
 247
 248                         if ( getpeername( ns, (struct sockaddr *) &from, &len )
 249                             == 0 ) {
 250                                 char *s;
 251                                 client_addr = inet_ntoa( from.sin_addr );
 252
 253 #if defined(SLAPD_RLOOKUPS) || defined(HAVE_TCPD)
 254                                 hp = gethostbyaddr( (char *)
 255                                     &(from.sin_addr.s_addr),
 256                                     sizeof(from.sin_addr.s_addr), AF_INET );
 257
 258                                 if(hp) {
 259                                         client_name = hp->h_name;
 260
 261                                         /* normalize the domain */
 262                                         for ( s = client_name; *s; s++ ) {
 263                                                 *s = TOLOWER( (unsigned char) *s );
 264                                         }
 265
 266                                 } else {
 267                                         client_name = NULL;
 268                                 }
 269 #else
 270                                 client_name = NULL;
 271 #endif
 272
 273                         } else {
 274                                 client_name = NULL;;
 275                                 client_addr = NULL;
 276                         }
 277
 278 #ifdef HAVE_TCPD
 279                         if(!hosts_ctl("slapd",
 280                                 client_name != NULL ? client_name : STRING_UNKNOWN,
 281                                 client_addr != NULL ? client_addr : STRING_UNKNOWN,
 282                                 STRING_UNKNOWN))
 283                         {
 284                                 /* DENY ACCESS */
 285                                 Statslog( LDAP_DEBUG_ANY,
 286                                  "fd=%d connection from %s (%s) denied.\n",
 287                                         ns,
 288                                                 client_name == NULL ? "unknown" : client_name,
 289                                                 client_addr == NULL ? "unknown" : client_addr,
 290                                   0, 0 );
 291
 292                                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 293                                 continue;
 294                         }
 295 #endif /* HAVE_TCPD */
 296
 297
 298                         ldap_pvt_thread_mutex_lock( &ops_mutex );
 299                         c[ns].c_connid = num_conns++;
 300                         ldap_pvt_thread_mutex_unlock( &ops_mutex );
 301
 302                         Statslog( LDAP_DEBUG_STATS,
 303                             "conn=%d fd=%d connection from %s (%s) accepted.\n",
 304                                 c[ns].c_connid, ns,
 305                                         client_name == NULL ? "unknown" : client_name,
 306                                         client_addr == NULL ? "unknown" : client_addr,
 307                              0 );
 308
 309                         if ( c[ns].c_addr != NULL ) {
 310                                 free( c[ns].c_addr );
 311                         }
 312                         c[ns].c_addr = ch_strdup( client_addr );
 313
 314                         if ( c[ns].c_domain != NULL ) {
 315                                 free( c[ns].c_domain );
 316                         }
 317
 318                         c[ns].c_domain = ch_strdup( client_name == NULL
 319                                 ? "" : client_name );
 320
 321                         ldap_pvt_thread_mutex_lock( &c[ns].c_dnmutex );
 322                         if ( c[ns].c_dn != NULL ) {
 323                                 free( c[ns].c_dn );
 324                                 c[ns].c_dn = NULL;
 325                         }
 326                         if ( c[ns].c_cdn != NULL ) {
 327                                 free( c[ns].c_cdn );
 328                                 c[ns].c_cdn = NULL;
 329                         }
 330                         ldap_pvt_thread_mutex_unlock( &c[ns].c_dnmutex );
 331
 332                         c[ns].c_starttime = currenttime;
 333                         c[ns].c_ops_received = 0;
 334                         c[ns].c_ops_executing = 0;
 335                         c[ns].c_ops_pending = 0;
 336                         c[ns].c_ops_completed = 0;
 337
 338                         lber_pvt_sb_set_desc( &c[ns].c_sb, ns );
 339                         lber_pvt_sb_set_io( &c[ns].c_sb, &lber_pvt_sb_io_tcp, NULL );
 340
 341                         if (lber_pvt_sb_set_nonblock( &c[ns].c_sb, 1)<0) {
 342                                 Debug( LDAP_DEBUG_ANY,
 343                                     "FIONBIO ioctl on %d failed\n", ns, 0, 0 );
 344                         }
 345
 346                         c[ns].c_state = SLAP_C_ACTIVE;
 347                 }
 348                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 349
 350                 Debug( LDAP_DEBUG_CONNS, "activity on:", 0, 0, 0 );
 351                 for ( i = 0; i < dtblsize; i++ ) {
 352                         int     r, w;
 353
 354                         r = FD_ISSET( i, &readfds );
 355                         w = FD_ISSET( i, &writefds );
 356                         if ( i != tcps && (r || w) ) {
 357                                 Debug( LDAP_DEBUG_CONNS, " %d%s%s", i,
 358                                     r ? "r" : "", w ? "w" : "" );
 359                         }
 360                 }
 361                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 362
 363                 for ( i = 0; i < dtblsize; i++ ) {
 364                         if ( i == tcps || (! FD_ISSET( i, &readfds ) &&
 365                             ! FD_ISSET( i, &writefds )) ) {
 366                                 continue;
 367                         }
 368
 369                         if ( FD_ISSET( i, &writefds ) ) {
 370                                 Debug( LDAP_DEBUG_CONNS,
 371                                     "signaling write waiter on %d\n", i, 0, 0 );
 372
 373                                 ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 374                                 active_threads++;
 375                                 c[i].c_writewaiter = 0;
 376                                 ldap_pvt_thread_cond_signal( &c[i].c_wcv );
 377                                 ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 378                         }
 379
 380                         if ( FD_ISSET( i, &readfds ) ||
 381                                 lber_pvt_sb_data_ready( &c[i].c_sb ) ) {
 382                                 Debug( LDAP_DEBUG_CONNS,
 383                                     "read activity on %d\n", i, 0, 0 );
 384
 385                                 connection_activity( &c[i] );
 386                         }
 387                 }
 388
 389                 ldap_pvt_thread_yield();
 390         }
 391
 392         Debug( LDAP_DEBUG_TRACE,
 393             "slapd shutdown: shutdown initiated.\n",
 394             0, 0, 0 );
 395
 396         close( tcps );
 397
 398         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 399         Debug( LDAP_DEBUG_ANY,
 400             "slapd shutdown: waiting for %d threads to terminate\n",
 401             active_threads, 0, 0 );
 402         while ( active_threads > 0 ) {
 403                 ldap_pvt_thread_cond_wait(&active_threads_cond, &active_threads_mutex);
 404         }
 405         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 406
 407         return NULL;
 408 }
 409
 410 void
 411 slap_set_shutdown( int sig )
 412 {
 413         Debug( LDAP_DEBUG_ANY, "slapd got shutdown signal %d\n", sig, 0, 0 );
 414         slapd_shutdown = 1;
 415         ldap_pvt_thread_kill( listener_tid, LDAP_SIGUSR1 );
 416
 417         /* reinstall self */
 418         (void) SIGNAL( sig, slap_set_shutdown );
 419 }
 420
 421 void
 422 slap_do_nothing( int sig )
 423 {
 424         Debug( LDAP_DEBUG_TRACE, "slapd got do_nothing signal %d\n", sig, 0, 0 );
 425
 426         /* reinstall self */
 427         (void) SIGNAL( sig, slap_do_nothing );
 428 }