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 HAVE_TCPD
  30 #include <tcpd.h>
  31
  32 int allow_severity = LOG_INFO;
  33 int deny_severity = LOG_NOTICE;
  34 #endif /* TCP Wrappers */
  35
  36 int             dtblsize;
  37 Connection      *c;
  38
  39 static int slapd_shutdown = 0;
  40 static void     set_shutdown(int sig);
  41 static void     do_nothing  (int sig);
  42
  43 /* a link to the slapd.conf configuration parameters */
  44 extern char *slapd_pid_file;
  45 extern char *slapd_args_file;
  46
  47 void *
  48 slapd_daemon(
  49     void *port
  50 )
  51 {
  52         Operation               *o;
  53         BerElement              ber;
  54         unsigned long           len, tag, msgid;
  55         int                     i;
  56         int                     tcps, ns;
  57         struct sockaddr_in      addr;
  58         fd_set                  readfds;
  59         fd_set                  writefds;
  60         FILE                    *fp;
  61         int                     on = 1;
  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                 c[i].c_sb.sb_sd = -1;
  86                 c[i].c_sb.sb_options = LBER_NO_READ_AHEAD;
  87                 c[i].c_sb.sb_naddr = 0;
  88                 c[i].c_sb.sb_ber.ber_buf = NULL;
  89                 c[i].c_sb.sb_ber.ber_ptr = NULL;
  90                 c[i].c_sb.sb_ber.ber_end = NULL;
  91                 c[i].c_writewaiter = 0;
  92                 c[i].c_connid = 0;
  93                 pthread_mutex_init( &c[i].c_dnmutex,
  94                     pthread_mutexattr_default );
  95                 pthread_mutex_init( &c[i].c_opsmutex,
  96                     pthread_mutexattr_default );
  97                 pthread_mutex_init( &c[i].c_pdumutex,
  98                     pthread_mutexattr_default );
  99                 pthread_cond_init( &c[i].c_wcv, pthread_condattr_default );
 100         }
 101
 102         if ( (tcps = socket( AF_INET, SOCK_STREAM, 0 )) == -1 ) {
 103                 Debug( LDAP_DEBUG_ANY, "socket() failed errno %d (%s)", errno,
 104                     errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 105                     "unknown", 0 );
 106                 exit( 1 );
 107         }
 108
 109         i = 1;
 110         if ( setsockopt( tcps, SOL_SOCKET, SO_REUSEADDR, (char *) &i,
 111             sizeof(i) ) == -1 ) {
 112                 Debug( LDAP_DEBUG_ANY, "setsockopt() failed errno %d (%s)",
 113                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 114                     "unknown", 0 );
 115         }
 116
 117         (void) memset( (void *) &addr, '\0', sizeof(addr) );
 118         addr.sin_family = AF_INET;
 119         addr.sin_addr.s_addr = INADDR_ANY;
 120         addr.sin_port = htons( (int)port );
 121         if ( bind( tcps, (struct sockaddr *) &addr, sizeof(addr) ) == -1 ) {
 122                 Debug( LDAP_DEBUG_ANY, "bind() failed errno %d (%s)\n",
 123                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 124                     "unknown", 0 );
 125                 exit( 1 );
 126         }
 127
 128         if ( listen( tcps, 5 ) == -1 ) {
 129                 Debug( LDAP_DEBUG_ANY, "listen() failed errno %d (%s)",
 130                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 131                     "unknown", 0 );
 132                 exit( 1 );
 133         }
 134
 135         (void) SIGNAL( SIGPIPE, SIG_IGN );
 136         (void) SIGNAL( LDAP_SIGUSR1, do_nothing );
 137         (void) SIGNAL( LDAP_SIGUSR2, set_shutdown );
 138         (void) SIGNAL( SIGTERM, set_shutdown );
 139         (void) SIGNAL( SIGINT, set_shutdown );
 140         (void) SIGNAL( SIGHUP, set_shutdown );
 141
 142         Debug( LDAP_DEBUG_ANY, "slapd starting\n", 0, 0, 0 );
 143
 144         if (( slapd_pid_file != NULL ) &&
 145                         (( fp = fopen( slapd_pid_file, "w" )) != NULL )) {
 146                 fprintf( fp, "%d\n", (int) getpid() );
 147                 fclose( fp );
 148         }
 149
 150         if (( slapd_args_file != NULL ) &&
 151                         (( fp = fopen( slapd_args_file, "w" )) != NULL )) {
 152                 for ( i = 0; i < g_argc; i++ ) {
 153                         fprintf( fp, "%s ", g_argv[i] );
 154                 }
 155                 fprintf( fp, "\n" );
 156                 fclose( fp );
 157         }
 158
 159         while ( !slapd_shutdown ) {
 160                 struct sockaddr_in      from;
 161                 struct hostent          *hp;
 162                 struct timeval          zero;
 163                 struct timeval          *tvp;
 164                 int                     len, pid;
 165
 166                 char    *client_name;
 167                 char    *client_addr;
 168
 169                 FD_ZERO( &writefds );
 170                 FD_ZERO( &readfds );
 171                 FD_SET( tcps, &readfds );
 172
 173                 zero.tv_sec = 0;
 174                 zero.tv_usec = 0;
 175
 176                 pthread_mutex_lock( &active_threads_mutex );
 177                 Debug( LDAP_DEBUG_CONNS,
 178                     "listening for connections on %d, activity on:",
 179                     tcps, 0, 0 );
 180
 181                 pthread_mutex_lock( &new_conn_mutex );
 182                 for ( i = 0; i < dtblsize; i++ ) {
 183                         if ( c[i].c_sb.sb_sd != -1 ) {
 184                                 FD_SET( c[i].c_sb.sb_sd, &readfds );
 185
 186                                 if ( c[i].c_writewaiter ) {
 187                                         FD_SET( c[i].c_sb.sb_sd, &writefds );
 188                                 }
 189                                 Debug( LDAP_DEBUG_CONNS, " %dr%s", i,
 190                                     c[i].c_writewaiter ? "w" : "", 0 );
 191                         }
 192                 }
 193                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 194                 pthread_mutex_unlock( &new_conn_mutex );
 195
 196                 Debug( LDAP_DEBUG_CONNS, "before select active_threads %d\n",
 197                     active_threads, 0, 0 );
 198 #if defined( HAVE_YIELDING_SELECT ) || defined( NO_THREADS )
 199                 tvp = NULL;
 200 #else
 201                 tvp = active_threads ? &zero : NULL;
 202 #endif
 203                 pthread_mutex_unlock( &active_threads_mutex );
 204
 205                 switch ( i = select( dtblsize, &readfds, &writefds, 0, tvp ) ) {
 206                 case -1:        /* failure - try again */
 207                         Debug( LDAP_DEBUG_CONNS,
 208                             "select failed errno %d (%s)\n",
 209                             errno, errno > -1 && errno < sys_nerr ?
 210                             sys_errlist[errno] : "unknown", 0 );
 211                         continue;
 212
 213                 case 0:         /* timeout - let threads run */
 214                         Debug( LDAP_DEBUG_CONNS, "select timeout - yielding\n",
 215                             0, 0, 0 );
 216                         pthread_yield();
 217                         continue;
 218
 219                 default:        /* something happened - deal with it */
 220                         Debug( LDAP_DEBUG_CONNS, "select activity on %d descriptors\n", i, 0, 0 );
 221                         ;       /* FALL */
 222                 }
 223                 pthread_mutex_lock( &currenttime_mutex );
 224                 time( &currenttime );
 225                 pthread_mutex_unlock( &currenttime_mutex );
 226
 227                 /* new connection */
 228                 pthread_mutex_lock( &new_conn_mutex );
 229                 if ( FD_ISSET( tcps, &readfds ) ) {
 230                         len = sizeof(from);
 231                         if ( (ns = accept( tcps, (struct sockaddr *) &from,
 232                             &len )) == -1 ) {
 233                                 Debug( LDAP_DEBUG_ANY,
 234                                     "accept() failed errno %d (%s)", errno,
 235                                     errno > -1 && errno < sys_nerr ?
 236                                     sys_errlist[errno] : "unknown", 0 );
 237                                 pthread_mutex_unlock( &new_conn_mutex );
 238                                 continue;
 239                         }
 240                         if ( ioctl( ns, FIONBIO, (caddr_t) &on ) == -1 ) {
 241                                 Debug( LDAP_DEBUG_ANY,
 242                                     "FIONBIO ioctl on %d failed\n", ns, 0, 0 );
 243                         }
 244
 245                         Debug( LDAP_DEBUG_CONNS, "new connection on %d\n", ns,
 246                             0, 0 );
 247
 248                         len = sizeof(from);
 249
 250                         if ( getpeername( ns, (struct sockaddr *) &from, &len )
 251                             == 0 ) {
 252                                 char *s;
 253                                 client_addr = inet_ntoa( from.sin_addr );
 254
 255 #if defined(SLAPD_RLOOKUPS) || defined(HAVE_TCPD)
 256                                 hp = gethostbyaddr( (char *)
 257                                     &(from.sin_addr.s_addr),
 258                                     sizeof(from.sin_addr.s_addr), AF_INET );
 259
 260                                 if(hp) {
 261                                         client_name = hp->h_name;
 262
 263                                         /* normalize the domain */
 264                                         for ( s = client_name; *s; s++ ) {
 265                                                 *s = TOLOWER( *s );
 266                                         }
 267
 268                                 } else {
 269                                         client_name = NULL;
 270                                 }
 271 #else
 272                                 client_name = NULL;
 273 #endif
 274
 275                         } else {
 276                                 client_name = NULL;;
 277                                 client_addr = NULL;
 278                         }
 279
 280 #ifdef HAVE_TCPD
 281                         if(!hosts_ctl("slapd",
 282                                 client_name != NULL ? client_name : STRING_UNKNOWN,
 283                                 client_addr != NULL ? client_addr : STRING_UNKNOWN,
 284                                 STRING_UNKNOWN))
 285                         {
 286                                 /* DENY ACCESS */
 287                                 Statslog( LDAP_DEBUG_ANY,
 288                                  "fd=%d connection from %s (%s) denied.\n",
 289                                         ns,
 290                                                 client_name == NULL ? "unknown" : client_name,
 291                                                 client_addr == NULL ? "unknown" : client_addr,
 292                                   0, 0 );
 293
 294                                 close(ns);
 295                                 pthread_mutex_unlock( &new_conn_mutex );
 296                                 continue;
 297                         }
 298 #endif /* HAVE_TCPD */
 299
 300                         c[ns].c_sb.sb_sd = ns;
 301                         pthread_mutex_lock( &ops_mutex );
 302                         c[ns].c_connid = num_conns++;
 303                         pthread_mutex_unlock( &ops_mutex );
 304
 305                         Statslog( LDAP_DEBUG_STATS,
 306                             "conn=%d fd=%d connection from %s (%s) accepted.\n",
 307                                 c[ns].c_connid, ns,
 308                                         client_name == NULL ? "unknown" : client_name,
 309                                         client_addr == NULL ? "unknown" : client_addr,
 310                              0 );
 311
 312                         if ( c[ns].c_addr != NULL ) {
 313                                 free( c[ns].c_addr );
 314                         }
 315                         c[ns].c_addr = ch_strdup( client_addr );
 316
 317                         if ( c[ns].c_domain != NULL ) {
 318                                 free( c[ns].c_domain );
 319                         }
 320
 321                         c[ns].c_domain = ch_strdup( client_name == NULL
 322                                 ? "" : client_name );
 323
 324                         pthread_mutex_lock( &c[ns].c_dnmutex );
 325                         if ( c[ns].c_dn != NULL ) {
 326                                 free( c[ns].c_dn );
 327                                 c[ns].c_dn = NULL;
 328                         }
 329                         if ( c[ns].c_cdn != NULL ) {
 330                                 free( c[ns].c_cdn );
 331                                 c[ns].c_cdn = NULL;
 332                         }
 333                         pthread_mutex_unlock( &c[ns].c_dnmutex );
 334                         c[ns].c_starttime = currenttime;
 335                         c[ns].c_opsinitiated = 0;
 336                         c[ns].c_opscompleted = 0;
 337                 }
 338                 pthread_mutex_unlock( &new_conn_mutex );
 339
 340                 Debug( LDAP_DEBUG_CONNS, "activity on:", 0, 0, 0 );
 341                 for ( i = 0; i < dtblsize; i++ ) {
 342                         int     r, w;
 343
 344                         r = FD_ISSET( i, &readfds );
 345                         w = FD_ISSET( i, &writefds );
 346                         if ( i != tcps && (r || w) ) {
 347                                 Debug( LDAP_DEBUG_CONNS, " %d%s%s", i,
 348                                     r ? "r" : "", w ? "w" : "" );
 349                         }
 350                 }
 351                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 352
 353                 for ( i = 0; i < dtblsize; i++ ) {
 354                         if ( i == tcps || (! FD_ISSET( i, &readfds ) &&
 355                             ! FD_ISSET( i, &writefds )) ) {
 356                                 continue;
 357                         }
 358
 359                         if ( FD_ISSET( i, &writefds ) ) {
 360                                 Debug( LDAP_DEBUG_CONNS,
 361                                     "signaling write waiter on %d\n", i, 0, 0 );
 362
 363                                 pthread_mutex_lock( &active_threads_mutex );
 364                                 pthread_cond_signal( &c[i].c_wcv );
 365                                 c[i].c_writewaiter = 0;
 366                                 active_threads++;
 367                                 pthread_mutex_unlock( &active_threads_mutex );
 368                         }
 369
 370                         if ( FD_ISSET( i, &readfds ) ) {
 371                                 Debug( LDAP_DEBUG_CONNS,
 372                                     "read activity on %d\n", i, 0, 0 );
 373
 374                                 connection_activity( &c[i] );
 375                         }
 376                 }
 377
 378                 pthread_yield();
 379         }
 380
 381         close( tcps );
 382
 383         pthread_mutex_lock( &active_threads_mutex );
 384         Debug( LDAP_DEBUG_ANY,
 385             "slapd shutting down - waiting for %d threads to terminate\n",
 386             active_threads, 0, 0 );
 387         while ( active_threads > 0 ) {
 388                 pthread_cond_wait(&active_threads_cond, &active_threads_mutex);
 389         }
 390         pthread_mutex_unlock( &active_threads_mutex );
 391
 392         /* let backends do whatever cleanup they need to do */
 393         Debug( LDAP_DEBUG_TRACE,
 394             "slapd shutting down - waiting for backends to close down\n", 0, 0,
 395             0 );
 396         be_close();
 397         Debug( LDAP_DEBUG_ANY, "slapd stopping\n", 0, 0, 0 );
 398         return NULL;
 399 }
 400
 401 static void
 402 set_shutdown( int sig )
 403 {
 404         Debug( LDAP_DEBUG_ANY, "slapd got shutdown signal %d\n", sig, 0, 0 );
 405         slapd_shutdown = 1;
 406         pthread_kill( listener_tid, LDAP_SIGUSR1 );
 407         (void) SIGNAL( LDAP_SIGUSR2, set_shutdown );
 408         (void) SIGNAL( SIGTERM, set_shutdown );
 409         (void) SIGNAL( SIGINT, set_shutdown );
 410         (void) SIGNAL( SIGHUP, set_shutdown );
 411 }
 412
 413 static void
 414 do_nothing( int sig )
 415 {
 416         Debug( LDAP_DEBUG_TRACE, "slapd got do_nothing signal %d\n", sig, 0, 0 );
 417         (void) SIGNAL( LDAP_SIGUSR1, do_nothing );
 418 }