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 *port
  54 )
  55 {
  56         int                     i;
  57         int                     tcps, ns;
  58         struct sockaddr_in      addr;
  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                 c[i].c_writewaiter = 0;
  87                 c[i].c_connid = 0;
  88                 ldap_pvt_thread_mutex_init( &c[i].c_dnmutex );
  89                 ldap_pvt_thread_mutex_init( &c[i].c_opsmutex );
  90                 ldap_pvt_thread_mutex_init( &c[i].c_pdumutex );
  91                 ldap_pvt_thread_cond_init( &c[i].c_wcv );
  92         }
  93
  94         if ( (tcps = socket( AF_INET, SOCK_STREAM, 0 )) == -1 ) {
  95                 Debug( LDAP_DEBUG_ANY, "socket() failed errno %d (%s)", errno,
  96                     errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
  97                     "unknown", 0 );
  98                 exit( 1 );
  99         }
 100
 101         i = 1;
 102         if ( setsockopt( tcps, SOL_SOCKET, SO_REUSEADDR, (char *) &i,
 103             sizeof(i) ) == -1 ) {
 104                 Debug( LDAP_DEBUG_ANY, "setsockopt() failed errno %d (%s)",
 105                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 106                     "unknown", 0 );
 107         }
 108
 109         (void) memset( (void *) &addr, '\0', sizeof(addr) );
 110         addr.sin_family = AF_INET;
 111         addr.sin_addr.s_addr = INADDR_ANY;
 112         addr.sin_port = htons( (int)port );
 113         if ( bind( tcps, (struct sockaddr *) &addr, sizeof(addr) ) == -1 ) {
 114                 Debug( LDAP_DEBUG_ANY, "bind() failed errno %d (%s)\n",
 115                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 116                     "unknown", 0 );
 117                 exit( 1 );
 118         }
 119
 120         if ( listen( tcps, 5 ) == -1 ) {
 121                 Debug( LDAP_DEBUG_ANY, "listen() failed errno %d (%s)",
 122                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 123                     "unknown", 0 );
 124                 exit( 1 );
 125         }
 126
 127         Debug( LDAP_DEBUG_ANY, "slapd starting\n", 0, 0, 0 );
 128
 129         if (( slapd_pid_file != NULL ) &&
 130                         (( fp = fopen( slapd_pid_file, "w" )) != NULL )) {
 131                 fprintf( fp, "%d\n", (int) getpid() );
 132                 fclose( fp );
 133         }
 134
 135         if (( slapd_args_file != NULL ) &&
 136                         (( fp = fopen( slapd_args_file, "w" )) != NULL )) {
 137                 for ( i = 0; i < g_argc; i++ ) {
 138                         fprintf( fp, "%s ", g_argv[i] );
 139                 }
 140                 fprintf( fp, "\n" );
 141                 fclose( fp );
 142         }
 143
 144         while ( !slapd_shutdown ) {
 145                 struct sockaddr_in      from;
 146                 struct hostent          *hp;
 147                 struct timeval          zero;
 148                 struct timeval          *tvp;
 149                 int                     len;
 150                 int                     data_ready;
 151
 152                 char    *client_name;
 153                 char    *client_addr;
 154
 155                 FD_ZERO( &writefds );
 156                 FD_ZERO( &readfds );
 157                 FD_SET( tcps, &readfds );
 158
 159                 zero.tv_sec = 0;
 160                 zero.tv_usec = 0;
 161
 162                 ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 163                 Debug( LDAP_DEBUG_CONNS,
 164                     "listening for connections on %d, activity on:",
 165                     tcps, 0, 0 );
 166
 167                 data_ready = 0;
 168
 169                 ldap_pvt_thread_mutex_lock( &new_conn_mutex );
 170                 for ( i = 0; i < dtblsize; i++ ) {
 171                         if ( lber_pvt_sb_in_use( &c[i].c_sb )) {
 172                                 FD_SET( lber_pvt_sb_get_desc(&c[i].c_sb),
 173                                         &readfds );
 174                                 if (lber_pvt_sb_data_ready(&c[i].c_sb))
 175                                         data_ready = 1;
 176                                 if ( c[i].c_writewaiter ) {
 177                                         FD_SET( lber_pvt_sb_get_desc(&c[i].c_sb),
 178                                                 &writefds );
 179                                 }
 180                                 Debug( LDAP_DEBUG_CONNS, " %dr%s", i,
 181                                     c[i].c_writewaiter ? "w" : "", 0 );
 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                         lber_pvt_sb_set_desc( &c[ns].c_sb, ns );
 244                         lber_pvt_sb_set_io( &c[ns].c_sb, &lber_pvt_sb_io_tcp, NULL );
 245
 246                         if (lber_pvt_sb_set_nonblock( &c[ns].c_sb, 1)<0) {
 247                                 Debug( LDAP_DEBUG_ANY,
 248                                     "FIONBIO ioctl on %d failed\n", ns, 0, 0 );
 249                         }
 250
 251                         Debug( LDAP_DEBUG_CONNS, "new connection on %d\n", ns,
 252                             0, 0 );
 253
 254                         len = sizeof(from);
 255
 256                         if ( getpeername( ns, (struct sockaddr *) &from, &len )
 257                             == 0 ) {
 258                                 char *s;
 259                                 client_addr = inet_ntoa( from.sin_addr );
 260
 261 #if defined(SLAPD_RLOOKUPS) || defined(HAVE_TCPD)
 262                                 hp = gethostbyaddr( (char *)
 263                                     &(from.sin_addr.s_addr),
 264                                     sizeof(from.sin_addr.s_addr), AF_INET );
 265
 266                                 if(hp) {
 267                                         client_name = hp->h_name;
 268
 269                                         /* normalize the domain */
 270                                         for ( s = client_name; *s; s++ ) {
 271                                                 *s = TOLOWER( (unsigned char) *s );
 272                                         }
 273
 274                                 } else {
 275                                         client_name = NULL;
 276                                 }
 277 #else
 278                                 client_name = NULL;
 279 #endif
 280
 281                         } else {
 282                                 client_name = NULL;;
 283                                 client_addr = NULL;
 284                         }
 285
 286 #ifdef HAVE_TCPD
 287                         if(!hosts_ctl("slapd",
 288                                 client_name != NULL ? client_name : STRING_UNKNOWN,
 289                                 client_addr != NULL ? client_addr : STRING_UNKNOWN,
 290                                 STRING_UNKNOWN))
 291                         {
 292                                 /* DENY ACCESS */
 293                                 Statslog( LDAP_DEBUG_ANY,
 294                                  "fd=%d connection from %s (%s) denied.\n",
 295                                         ns,
 296                                                 client_name == NULL ? "unknown" : client_name,
 297                                                 client_addr == NULL ? "unknown" : client_addr,
 298                                   0, 0 );
 299
 300                                 lber_pvt_sb_close( &c[ns].c_sb );
 301                                 lber_pvt_sb_destroy( &c[ns].c_sb );
 302                                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 303                                 continue;
 304                         }
 305 #endif /* HAVE_TCPD */
 306
 307
 308                         ldap_pvt_thread_mutex_lock( &ops_mutex );
 309                         c[ns].c_connid = num_conns++;
 310                         ldap_pvt_thread_mutex_unlock( &ops_mutex );
 311
 312                         Statslog( LDAP_DEBUG_STATS,
 313                             "conn=%d fd=%d connection from %s (%s) accepted.\n",
 314                                 c[ns].c_connid, ns,
 315                                         client_name == NULL ? "unknown" : client_name,
 316                                         client_addr == NULL ? "unknown" : client_addr,
 317                              0 );
 318
 319                         if ( c[ns].c_addr != NULL ) {
 320                                 free( c[ns].c_addr );
 321                         }
 322                         c[ns].c_addr = ch_strdup( client_addr );
 323
 324                         if ( c[ns].c_domain != NULL ) {
 325                                 free( c[ns].c_domain );
 326                         }
 327
 328                         c[ns].c_domain = ch_strdup( client_name == NULL
 329                                 ? "" : client_name );
 330
 331                         ldap_pvt_thread_mutex_lock( &c[ns].c_dnmutex );
 332                         if ( c[ns].c_dn != NULL ) {
 333                                 free( c[ns].c_dn );
 334                                 c[ns].c_dn = NULL;
 335                         }
 336                         if ( c[ns].c_cdn != NULL ) {
 337                                 free( c[ns].c_cdn );
 338                                 c[ns].c_cdn = NULL;
 339                         }
 340                         ldap_pvt_thread_mutex_unlock( &c[ns].c_dnmutex );
 341                         c[ns].c_starttime = currenttime;
 342                         c[ns].c_opsinitiated = 0;
 343                         c[ns].c_opscompleted = 0;
 344                 }
 345                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 346
 347                 Debug( LDAP_DEBUG_CONNS, "activity on:", 0, 0, 0 );
 348                 for ( i = 0; i < dtblsize; i++ ) {
 349                         int     r, w;
 350
 351                         r = FD_ISSET( i, &readfds );
 352                         w = FD_ISSET( i, &writefds );
 353                         if ( i != tcps && (r || w) ) {
 354                                 Debug( LDAP_DEBUG_CONNS, " %d%s%s", i,
 355                                     r ? "r" : "", w ? "w" : "" );
 356                         }
 357                 }
 358                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 359
 360                 for ( i = 0; i < dtblsize; i++ ) {
 361                         if ( i == tcps || (! FD_ISSET( i, &readfds ) &&
 362                             ! FD_ISSET( i, &writefds )) ) {
 363                                 continue;
 364                         }
 365
 366                         if ( FD_ISSET( i, &writefds ) ) {
 367                                 Debug( LDAP_DEBUG_CONNS,
 368                                     "signaling write waiter on %d\n", i, 0, 0 );
 369
 370                                 ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 371                                 active_threads++;
 372                                 c[i].c_writewaiter = 0;
 373                                 ldap_pvt_thread_cond_signal( &c[i].c_wcv );
 374                                 ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 375                         }
 376
 377                         if ( FD_ISSET( i, &readfds ) ||
 378                                 lber_pvt_sb_data_ready( &c[i].c_sb ) ) {
 379                                 Debug( LDAP_DEBUG_CONNS,
 380                                     "read activity on %d\n", i, 0, 0 );
 381
 382                                 connection_activity( &c[i] );
 383                         }
 384                 }
 385
 386                 ldap_pvt_thread_yield();
 387         }
 388
 389         Debug( LDAP_DEBUG_TRACE,
 390             "slapd shutdown: shutdown initiated.\n",
 391             0, 0, 0 );
 392
 393         close( tcps );
 394
 395         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 396         Debug( LDAP_DEBUG_ANY,
 397             "slapd shutdown: waiting for %d threads to terminate\n",
 398             active_threads, 0, 0 );
 399         while ( active_threads > 0 ) {
 400                 ldap_pvt_thread_cond_wait(&active_threads_cond, &active_threads_mutex);
 401         }
 402         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 403
 404         return NULL;
 405 }
 406
 407 void
 408 slap_set_shutdown( int sig )
 409 {
 410         Debug( LDAP_DEBUG_ANY, "slapd got shutdown signal %d\n", sig, 0, 0 );
 411         slapd_shutdown = 1;
 412         ldap_pvt_thread_kill( listener_tid, LDAP_SIGUSR1 );
 413
 414         /* reinstall self */
 415         (void) SIGNAL( sig, slap_set_shutdown );
 416 }
 417
 418 void
 419 slap_do_nothing( int sig )
 420 {
 421         Debug( LDAP_DEBUG_TRACE, "slapd got do_nothing signal %d\n", sig, 0, 0 );
 422
 423         /* reinstall self */
 424         (void) SIGNAL( sig, slap_do_nothing );
 425 }