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 <stdio.h>
   9 #include <string.h>
  10 #include <sys/types.h>
  11 #include <sys/socket.h>
  12 #include <errno.h>
  13 #include <sys/time.h>
  14 #include <netinet/in.h>
  15 #include <arpa/inet.h>
  16 #include <netdb.h>
  17 #include <signal.h>
  18 #ifdef _AIX
  19 #include <sys/select.h>
  20 #endif
  21 #include "slap.h"
  22 #include "portable.h"
  23 #include "ldapconfig.h"
  24 #ifdef NEED_FILIO
  25 #include <sys/filio.h>
  26 #else /* NEED_FILIO */
  27 #include <sys/ioctl.h>
  28 #endif /* NEED_FILIO */
  29 #ifdef USE_SYSCONF
  30 #include <unistd.h>
  31 #endif /* USE_SYSCONF */
  32
  33 #ifdef TCP_WRAPPERS
  34 #include <tcpd.h>
  35
  36 int allow_severity = LOG_INFO;
  37 int deny_severity = LOG_NOTICE;
  38 #endif /* TCP_WRAPPERS */
  39
  40 extern Operation        *op_add();
  41
  42 #ifndef SYSERRLIST_IN_STDIO
  43 extern int              sys_nerr;
  44 extern char             *sys_errlist[];
  45 #endif
  46 extern time_t           currenttime;
  47 extern pthread_mutex_t  currenttime_mutex;
  48 extern int              active_threads;
  49 extern pthread_mutex_t  active_threads_mutex;
  50 extern pthread_mutex_t  new_conn_mutex;
  51 extern int              slapd_shutdown;
  52 extern pthread_t        listener_tid;
  53 extern int              num_conns;
  54 extern pthread_mutex_t  ops_mutex;
  55 extern int              g_argc;
  56 extern char             **g_argv;
  57
  58 int             dtblsize;
  59 Connection      *c;
  60
  61 static void     set_shutdown();
  62 static void     do_nothing();
  63
  64 void
  65 slapd_daemon(
  66     int port
  67 )
  68 {
  69         Operation               *o;
  70         BerElement              ber;
  71         unsigned long           len, tag, msgid;
  72         int                     i;
  73         int                     tcps, ns;
  74         struct sockaddr_in      addr;
  75         fd_set                  readfds;
  76         fd_set                  writefds;
  77         FILE                    *fp;
  78         int                     on = 1;
  79
  80 #ifdef USE_SYSCONF
  81         dtblsize = sysconf( _SC_OPEN_MAX );
  82 #else /* USE_SYSCONF */
  83         dtblsize = getdtablesize();
  84 #endif /* USE_SYSCONF */
  85         /*
  86          * Add greg@greg.rim.or.jp
  87          */
  88 #ifdef FD_SETSIZE
  89         if(dtblsize > FD_SETSIZE) {
  90                 dtblsize = FD_SETSIZE;
  91         }
  92 #endif  /* !FD_SETSIZE */
  93
  94         c = (Connection *) ch_calloc( 1, dtblsize * sizeof(Connection) );
  95
  96         for ( i = 0; i < dtblsize; i++ ) {
  97                 c[i].c_dn = NULL;
  98                 c[i].c_addr = NULL;
  99                 c[i].c_domain = NULL;
 100                 c[i].c_ops = NULL;
 101                 c[i].c_sb.sb_sd = -1;
 102                 c[i].c_sb.sb_options = LBER_NO_READ_AHEAD;
 103                 c[i].c_sb.sb_naddr = 0;
 104                 c[i].c_sb.sb_ber.ber_buf = NULL;
 105                 c[i].c_sb.sb_ber.ber_ptr = NULL;
 106                 c[i].c_sb.sb_ber.ber_end = NULL;
 107                 c[i].c_writewaiter = 0;
 108                 c[i].c_connid = 0;
 109                 pthread_mutex_init( &c[i].c_dnmutex,
 110                     pthread_mutexattr_default );
 111                 pthread_mutex_init( &c[i].c_opsmutex,
 112                     pthread_mutexattr_default );
 113                 pthread_mutex_init( &c[i].c_pdumutex,
 114                     pthread_mutexattr_default );
 115                 pthread_cond_init( &c[i].c_wcv, pthread_condattr_default );
 116         }
 117
 118         if ( (tcps = socket( AF_INET, SOCK_STREAM, 0 )) == -1 ) {
 119                 Debug( LDAP_DEBUG_ANY, "socket() failed errno %d (%s)", errno,
 120                     errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 121                     "unknown", 0 );
 122                 exit( 1 );
 123         }
 124
 125         i = 1;
 126         if ( setsockopt( tcps, SOL_SOCKET, SO_REUSEADDR, (char *) &i,
 127             sizeof(i) ) == -1 ) {
 128                 Debug( LDAP_DEBUG_ANY, "setsockopt() failed errno %d (%s)",
 129                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 130                     "unknown", 0 );
 131         }
 132
 133         (void) memset( (void *) &addr, '\0', sizeof(addr) );
 134         addr.sin_family = AF_INET;
 135         addr.sin_addr.s_addr = INADDR_ANY;
 136         addr.sin_port = htons( port );
 137         if ( bind( tcps, (struct sockaddr *) &addr, sizeof(addr) ) == -1 ) {
 138                 Debug( LDAP_DEBUG_ANY, "bind() failed errno %d (%s)\n",
 139                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 140                     "unknown", 0 );
 141                 exit( 1 );
 142         }
 143
 144         if ( listen( tcps, 5 ) == -1 ) {
 145                 Debug( LDAP_DEBUG_ANY, "listen() failed errno %d (%s)",
 146                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 147                     "unknown", 0 );
 148                 exit( 1 );
 149         }
 150
 151         (void) SIGNAL( SIGPIPE, SIG_IGN );
 152 #ifdef SIGSTKFLT
 153         (void) SIGNAL( SIGSTKFLT, (void *) do_nothing );
 154 #else
 155         (void) SIGNAL( SIGUSR1, (void *) do_nothing );
 156 #endif
 157 #ifdef SIGUNUSED
 158         (void) SIGNAL( SIGUNUSED, (void *) set_shutdown );
 159 #else
 160         (void) SIGNAL( SIGUSR2, (void *) set_shutdown );
 161 #endif
 162         (void) SIGNAL( SIGTERM, (void *) set_shutdown );
 163         (void) SIGNAL( SIGINT, (void *) set_shutdown );
 164         (void) SIGNAL( SIGHUP, (void *) set_shutdown );
 165
 166         Debug( LDAP_DEBUG_ANY, "slapd starting\n", 0, 0, 0 );
 167 #ifdef SLAPD_PIDFILE
 168         if ( (fp = fopen( SLAPD_PIDFILE, "w" )) != NULL ) {
 169                 fprintf( fp, "%d\n", getpid() );
 170                 fclose( fp );
 171         }
 172 #endif
 173 #ifdef SLAPD_ARGSFILE
 174         if ( (fp = fopen( SLAPD_ARGSFILE, "w" )) != NULL ) {
 175                 for ( i = 0; i < g_argc; i++ ) {
 176                         fprintf( fp, "%s ", g_argv[i] );
 177                 }
 178                 fprintf( fp, "\n" );
 179                 fclose( fp );
 180         }
 181 #endif
 182
 183         while ( !slapd_shutdown ) {
 184                 struct sockaddr_in      from;
 185                 struct hostent          *hp;
 186                 struct timeval          zero;
 187                 struct timeval          *tvp;
 188                 int                     len, pid;
 189
 190                 char    *client_name;
 191                 char    *client_addr;
 192
 193                 FD_ZERO( &writefds );
 194                 FD_ZERO( &readfds );
 195                 FD_SET( tcps, &readfds );
 196
 197                 pthread_mutex_lock( &active_threads_mutex );
 198                 Debug( LDAP_DEBUG_CONNS,
 199                     "listening for connections on %d, activity on:",
 200                     tcps, 0, 0 );
 201
 202                 pthread_mutex_lock( &new_conn_mutex );
 203                 for ( i = 0; i < dtblsize; i++ ) {
 204                         if ( c[i].c_sb.sb_sd != -1 ) {
 205                                 FD_SET( c[i].c_sb.sb_sd, &readfds );
 206
 207                                 if ( c[i].c_writewaiter ) {
 208                                         FD_SET( c[i].c_sb.sb_sd, &writefds );
 209                                 }
 210                                 Debug( LDAP_DEBUG_CONNS, " %dr%s", i,
 211                                     c[i].c_writewaiter ? "w" : "", 0 );
 212                         }
 213                 }
 214                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 215                 pthread_mutex_unlock( &new_conn_mutex );
 216
 217                 zero.tv_sec = 0;
 218                 zero.tv_usec = 0;
 219                 Debug( LDAP_DEBUG_CONNS, "before select active_threads %d\n",
 220                     active_threads, 0, 0 );
 221 #ifdef PTHREAD_PREEMPTIVE
 222                 tvp = NULL;
 223 #else
 224                 tvp = active_threads ? &zero : NULL;
 225 #endif
 226                 pthread_mutex_unlock( &active_threads_mutex );
 227
 228                 switch ( i = select( dtblsize, &readfds, &writefds, 0, tvp ) ) {
 229                 case -1:        /* failure - try again */
 230                         Debug( LDAP_DEBUG_CONNS,
 231                             "select failed errno %d (%s)\n",
 232                             errno, errno > -1 && errno < sys_nerr ?
 233                             sys_errlist[errno] : "unknown", 0 );
 234                         continue;
 235
 236                 case 0:         /* timeout - let threads run */
 237                         Debug( LDAP_DEBUG_CONNS, "select timeout - yielding\n",
 238                             0, 0, 0 );
 239                         pthread_yield();
 240                         continue;
 241
 242                 default:        /* something happened - deal with it */
 243                         Debug( LDAP_DEBUG_CONNS, "select activity on %d descriptors\n", i, 0, 0 );
 244                         ;       /* FALL */
 245                 }
 246                 pthread_mutex_lock( &currenttime_mutex );
 247                 time( &currenttime );
 248                 pthread_mutex_unlock( &currenttime_mutex );
 249
 250                 /* new connection */
 251                 pthread_mutex_lock( &new_conn_mutex );
 252                 if ( FD_ISSET( tcps, &readfds ) ) {
 253                         len = sizeof(from);
 254                         if ( (ns = accept( tcps, (struct sockaddr *) &from,
 255                             &len )) == -1 ) {
 256                                 Debug( LDAP_DEBUG_ANY,
 257                                     "accept() failed errno %d (%s)", errno,
 258                                     errno > -1 && errno < sys_nerr ?
 259                                     sys_errlist[errno] : "unknown", 0 );
 260                                 pthread_mutex_unlock( &new_conn_mutex );
 261                                 continue;
 262                         }
 263                         if ( ioctl( ns, FIONBIO, (caddr_t) &on ) == -1 ) {
 264                                 Debug( LDAP_DEBUG_ANY,
 265                                     "FIONBIO ioctl on %d failed\n", ns, 0, 0 );
 266                         }
 267
 268                         c[ns].c_sb.sb_sd = ns;
 269                         Debug( LDAP_DEBUG_CONNS, "new connection on %d\n", ns,
 270                             0, 0 );
 271
 272                         pthread_mutex_lock( &ops_mutex );
 273                         c[ns].c_connid = num_conns++;
 274                         pthread_mutex_unlock( &ops_mutex );
 275
 276                         len = sizeof(from);
 277
 278                         if ( getpeername( ns, (struct sockaddr *) &from, &len )
 279                             == 0 ) {
 280                                 char *s;
 281                                 client_addr = inet_ntoa( from.sin_addr );
 282
 283 #if defined(REVERSE_LOOKUP) || defined(TCP_WRAPPERS)
 284                                 hp = gethostbyaddr( (char *)
 285                                     &(from.sin_addr.s_addr),
 286                                     sizeof(from.sin_addr.s_addr), AF_INET );
 287
 288                                 if(hp) {
 289                                         client_name = hp->h_name;
 290
 291                                         /* normalize the domain */
 292                                         for ( s = client_name; *s; s++ ) {
 293                                                 *s = TOLOWER( *s );
 294                                         }
 295
 296                                 } else {
 297                                         client_name = NULL;
 298                                 }
 299 #else
 300                                 client_name = NULL;
 301 #endif
 302
 303                         } else {
 304                                 client_name = NULL;;
 305                                 client_addr = NULL;
 306                         }
 307
 308 #ifdef TCP_WRAPPERS
 309                         if(!hosts_ctl("slapd", client_name, client_addr,
 310                                 STRING_UNKNOWN))
 311                         {
 312                                 /* DENY ACCESS */
 313                                 Statslog( LDAP_DEBUG_STATS,
 314                                  "conn=%d fd=%d connection from %s (%s) denied.\n",
 315                                         c[ns].c_connid, ns,
 316                                                 client_name == NULL ? "unknown" : client_name,
 317                                                 client_addr == NULL ? "unknown" : client_addr,
 318                                   0 );
 319
 320                                 close(ns);
 321                                 pthread_mutex_unlock( &new_conn_mutex );
 322                                 continue;
 323                         }
 324 #endif /* TCP_WRAPPERS */
 325
 326                         Statslog( LDAP_DEBUG_STATS,
 327                             "conn=%d fd=%d connection from %s (%s) accepted.\n",
 328                                 c[ns].c_connid, ns,
 329                                         client_name == NULL ? "unknown" : client_name,
 330                                         client_addr == NULL ? "unknown" : client_addr,
 331                              0 );
 332
 333                         if ( c[ns].c_addr != NULL ) {
 334                                 free( c[ns].c_addr );
 335                         }
 336                         c[ns].c_addr = strdup( client_addr );
 337
 338                         if ( c[ns].c_domain != NULL ) {
 339                                 free( c[ns].c_domain );
 340                         }
 341
 342                         c[ns].c_domain = strdup( client_name == NULL
 343                                 ? "" : client_name );
 344
 345                         pthread_mutex_lock( &c[ns].c_dnmutex );
 346                         if ( c[ns].c_dn != NULL ) {
 347                                 free( c[ns].c_dn );
 348                                 c[ns].c_dn = NULL;
 349                         }
 350                         pthread_mutex_unlock( &c[ns].c_dnmutex );
 351                         c[ns].c_starttime = currenttime;
 352                         c[ns].c_opsinitiated = 0;
 353                         c[ns].c_opscompleted = 0;
 354                 }
 355                 pthread_mutex_unlock( &new_conn_mutex );
 356
 357                 Debug( LDAP_DEBUG_CONNS, "activity on:", 0, 0, 0 );
 358                 for ( i = 0; i < dtblsize; i++ ) {
 359                         int     r, w;
 360
 361                         r = FD_ISSET( i, &readfds );
 362                         w = FD_ISSET( i, &writefds );
 363                         if ( i != tcps && (r || w) ) {
 364                                 Debug( LDAP_DEBUG_CONNS, " %d%s%s", i,
 365                                     r ? "r" : "", w ? "w" : "" );
 366                         }
 367                 }
 368                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 369
 370                 for ( i = 0; i < dtblsize; i++ ) {
 371                         if ( i == tcps || (! FD_ISSET( i, &readfds ) &&
 372                             ! FD_ISSET( i, &writefds )) ) {
 373                                 continue;
 374                         }
 375
 376                         if ( FD_ISSET( i, &writefds ) ) {
 377                                 Debug( LDAP_DEBUG_CONNS,
 378                                     "signaling write waiter on %d\n", i, 0, 0 );
 379
 380                                 pthread_mutex_lock( &active_threads_mutex );
 381                                 pthread_cond_signal( &c[i].c_wcv );
 382                                 c[i].c_writewaiter = 0;
 383                                 active_threads++;
 384                                 pthread_mutex_unlock( &active_threads_mutex );
 385                         }
 386
 387                         if ( FD_ISSET( i, &readfds ) ) {
 388                                 Debug( LDAP_DEBUG_CONNS,
 389                                     "read activity on %d\n", i, 0, 0 );
 390
 391                                 connection_activity( &c[i] );
 392                         }
 393                 }
 394
 395                 pthread_yield();
 396         }
 397
 398         close( tcps );
 399         pthread_mutex_lock( &active_threads_mutex );
 400         Debug( LDAP_DEBUG_ANY,
 401             "slapd shutting down - waiting for %d threads to terminate\n",
 402             active_threads, 0, 0 );
 403         while ( active_threads > 0 ) {
 404                 pthread_mutex_unlock( &active_threads_mutex );
 405                 pthread_yield();
 406                 pthread_mutex_lock( &active_threads_mutex );
 407         }
 408         pthread_mutex_unlock( &active_threads_mutex );
 409
 410         /* let backends do whatever cleanup they need to do */
 411         Debug( LDAP_DEBUG_TRACE,
 412             "slapd shutting down - waiting for backends to close down\n", 0, 0,
 413             0 );
 414         be_close();
 415         Debug( LDAP_DEBUG_ANY, "slapd stopping\n", 0, 0, 0 );
 416 }
 417
 418 static void
 419 set_shutdown()
 420 {
 421         Debug( LDAP_DEBUG_ANY, "slapd got shutdown signal\n", 0, 0, 0 );
 422         slapd_shutdown = 1;
 423 #ifdef SIGSTKFLT
 424         pthread_kill( listener_tid, SIGSTKFLT );
 425 #else
 426         pthread_kill( listener_tid, SIGUSR1 );
 427 #endif
 428 #ifdef SIGUNUSED
 429         (void) SIGNAL( SIGUNUSED, (void *) set_shutdown );
 430 #else
 431         (void) SIGNAL( SIGUSR2, (void *) set_shutdown );
 432 #endif
 433         (void) SIGNAL( SIGTERM, (void *) set_shutdown );
 434         (void) SIGNAL( SIGINT, (void *) set_shutdown );
 435         (void) SIGNAL( SIGHUP, (void *) set_shutdown );
 436 }
 437
 438 static void
 439 do_nothing()
 440 {
 441         Debug( LDAP_DEBUG_TRACE, "slapd got do_nothing signal\n", 0, 0, 0 );
 442 #ifdef SIGSTKFLT
 443         (void) SIGNAL( SIGSTKFLT, (void *) do_nothing );
 444 #else
 445         (void) SIGNAL( SIGUSR1, (void *) do_nothing );
 446 #endif
 447 }