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 extern Operation        *op_add();
  34
  35 #ifndef SYSERRLIST_IN_STDIO
  36 extern int              sys_nerr;
  37 extern char             *sys_errlist[];
  38 #endif
  39 extern time_t           currenttime;
  40 extern pthread_mutex_t  currenttime_mutex;
  41 extern int              active_threads;
  42 extern pthread_mutex_t  active_threads_mutex;
  43 extern pthread_mutex_t  new_conn_mutex;
  44 extern int              slapd_shutdown;
  45 extern pthread_t        listener_tid;
  46 extern int              num_conns;
  47 extern pthread_mutex_t  ops_mutex;
  48 extern int              g_argc;
  49 extern char             **g_argv;
  50
  51 int             dtblsize;
  52 Connection      *c;
  53
  54 static void     set_shutdown();
  55 static void     do_nothing();
  56
  57 void
  58 daemon(
  59     int port
  60 )
  61 {
  62         Operation               *o;
  63         BerElement              ber;
  64         unsigned long           len, tag, msgid;
  65         int                     i;
  66         int                     tcps, ns;
  67         struct sockaddr_in      addr;
  68         fd_set                  readfds;
  69         fd_set                  writefds;
  70         FILE                    *fp;
  71         int                     on = 1;
  72
  73 #ifdef USE_SYSCONF
  74         dtblsize = sysconf( _SC_OPEN_MAX );
  75 #else /* USE_SYSCONF */
  76         dtblsize = getdtablesize();
  77 #endif /* USE_SYSCONF */
  78
  79         c = (Connection *) ch_calloc( 1, dtblsize * sizeof(Connection) );
  80
  81         for ( i = 0; i < dtblsize; i++ ) {
  82                 c[i].c_dn = NULL;
  83                 c[i].c_addr = NULL;
  84                 c[i].c_domain = NULL;
  85                 c[i].c_ops = NULL;
  86                 c[i].c_sb.sb_sd = -1;
  87                 c[i].c_sb.sb_options = LBER_NO_READ_AHEAD;
  88                 c[i].c_sb.sb_naddr = 0;
  89                 c[i].c_sb.sb_ber.ber_buf = NULL;
  90                 c[i].c_sb.sb_ber.ber_ptr = NULL;
  91                 c[i].c_sb.sb_ber.ber_end = NULL;
  92                 c[i].c_writewaiter = 0;
  93                 c[i].c_connid = 0;
  94                 pthread_mutex_init( &c[i].c_dnmutex,
  95                     pthread_mutexattr_default );
  96                 pthread_mutex_init( &c[i].c_opsmutex,
  97                     pthread_mutexattr_default );
  98                 pthread_mutex_init( &c[i].c_pdumutex,
  99                     pthread_mutexattr_default );
 100                 pthread_cond_init( &c[i].c_wcv, pthread_condattr_default );
 101         }
 102
 103         if ( (tcps = socket( AF_INET, SOCK_STREAM, 0 )) == -1 ) {
 104                 Debug( LDAP_DEBUG_ANY, "socket() failed errno %d (%s)", errno,
 105                     errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 106                     "unknown", 0 );
 107                 exit( 1 );
 108         }
 109
 110         i = 1;
 111         if ( setsockopt( tcps, SOL_SOCKET, SO_REUSEADDR, (char *) &i,
 112             sizeof(i) ) == -1 ) {
 113                 Debug( LDAP_DEBUG_ANY, "setsockopt() failed errno %d (%s)",
 114                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 115                     "unknown", 0 );
 116         }
 117
 118         (void) memset( (void *) &addr, '\0', sizeof(addr) );
 119         addr.sin_family = AF_INET;
 120         addr.sin_addr.s_addr = INADDR_ANY;
 121         addr.sin_port = htons( port );
 122         if ( bind( tcps, (struct sockaddr *) &addr, sizeof(addr) ) == -1 ) {
 123                 Debug( LDAP_DEBUG_ANY, "bind() failed errno %d (%s)\n",
 124                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 125                     "unknown", 0 );
 126                 exit( 1 );
 127         }
 128
 129         if ( listen( tcps, 5 ) == -1 ) {
 130                 Debug( LDAP_DEBUG_ANY, "listen() failed errno %d (%s)",
 131                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 132                     "unknown", 0 );
 133                 exit( 1 );
 134         }
 135
 136         (void) SIGNAL( SIGPIPE, SIG_IGN );
 137         (void) SIGNAL( SIGUSR1, (void *) do_nothing );
 138         (void) SIGNAL( SIGUSR2, (void *) set_shutdown );
 139         (void) SIGNAL( SIGTERM, (void *) set_shutdown );
 140         (void) SIGNAL( SIGHUP, (void *) set_shutdown );
 141
 142         Debug( LDAP_DEBUG_ANY, "slapd starting\n", 0, 0, 0 );
 143 #ifdef SLAPD_PIDFILE
 144         if ( (fp = fopen( SLAPD_PIDFILE, "w" )) != NULL ) {
 145                 fprintf( fp, "%d\n", getpid() );
 146                 fclose( fp );
 147         }
 148 #endif
 149 #ifdef SLAPD_ARGSFILE
 150         if ( (fp = fopen( SLAPD_ARGSFILE, "w" )) != NULL ) {
 151                 for ( i = 0; i < g_argc; i++ ) {
 152                         fprintf( fp, "%s ", g_argv[i] );
 153                 }
 154                 fprintf( fp, "\n" );
 155                 fclose( fp );
 156         }
 157 #endif
 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                 FD_ZERO( &writefds );
 167                 FD_ZERO( &readfds );
 168                 FD_SET( tcps, &readfds );
 169
 170                 pthread_mutex_lock( &active_threads_mutex );
 171                 Debug( LDAP_DEBUG_CONNS,
 172                     "listening for connections on %d, activity on:",
 173                     tcps, 0, 0 );
 174
 175                 pthread_mutex_lock( &new_conn_mutex );
 176                 for ( i = 0; i < dtblsize; i++ ) {
 177                         if ( c[i].c_sb.sb_sd != -1 ) {
 178                                 FD_SET( c[i].c_sb.sb_sd, &readfds );
 179
 180                                 if ( c[i].c_writewaiter ) {
 181                                         FD_SET( c[i].c_sb.sb_sd, &writefds );
 182                                 }
 183                                 Debug( LDAP_DEBUG_CONNS, " %dr%s", i,
 184                                     c[i].c_writewaiter ? "w" : "", 0 );
 185                         }
 186                 }
 187                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 188                 pthread_mutex_unlock( &new_conn_mutex );
 189
 190                 zero.tv_sec = 0;
 191                 zero.tv_usec = 0;
 192                 Debug( LDAP_DEBUG_CONNS, "before select active_threads %d\n",
 193                     active_threads, 0, 0 );
 194 #ifdef PTHREAD_PREEMPTIVE
 195                 tvp = NULL;
 196 #else
 197                 tvp = active_threads ? &zero : NULL;
 198 #endif
 199                 pthread_mutex_unlock( &active_threads_mutex );
 200
 201                 switch ( select( dtblsize, &readfds, &writefds, 0, tvp ) ) {
 202                 case -1:        /* failure - try again */
 203                         Debug( LDAP_DEBUG_CONNS,
 204                             "select failed errno %d (%s)\n",
 205                             errno, errno > -1 && errno < sys_nerr ?
 206                             sys_errlist[errno] : "unknown", 0 );
 207                         continue;
 208
 209                 case 0:         /* timeout - let threads run */
 210                         Debug( LDAP_DEBUG_CONNS, "select timeout - yielding\n",
 211                             0, 0, 0 );
 212                         pthread_yield();
 213                         continue;
 214
 215                 default:        /* something happened - deal with it */
 216                         Debug( LDAP_DEBUG_CONNS, "select activity\n", 0, 0, 0 );
 217                         ;       /* FALL */
 218                 }
 219                 pthread_mutex_lock( &currenttime_mutex );
 220                 time( &currenttime );
 221                 pthread_mutex_unlock( &currenttime_mutex );
 222
 223                 /* new connection */
 224                 pthread_mutex_lock( &new_conn_mutex );
 225                 if ( FD_ISSET( tcps, &readfds ) ) {
 226                         len = sizeof(from);
 227                         if ( (ns = accept( tcps, (struct sockaddr *) &from,
 228                             &len )) == -1 ) {
 229                                 Debug( LDAP_DEBUG_ANY,
 230                                     "accept() failed errno %d (%s)", errno,
 231                                     errno > -1 && errno < sys_nerr ?
 232                                     sys_errlist[errno] : "unknown", 0 );
 233                                 pthread_mutex_unlock( &new_conn_mutex );
 234                                 continue;
 235                         }
 236                         if ( ioctl( ns, FIONBIO, (caddr_t) &on ) == -1 ) {
 237                                 Debug( LDAP_DEBUG_ANY,
 238                                     "FIONBIO ioctl on %d faled\n", ns, 0, 0 );
 239                         }
 240                         c[ns].c_sb.sb_sd = ns;
 241                         Debug( LDAP_DEBUG_CONNS, "new connection on %d\n", ns,
 242                             0, 0 );
 243
 244                         pthread_mutex_lock( &ops_mutex );
 245                         c[ns].c_connid = num_conns++;
 246                         pthread_mutex_unlock( &ops_mutex );
 247                         len = sizeof(from);
 248                         if ( getpeername( ns, (struct sockaddr *) &from, &len )
 249                             == 0 ) {
 250                                 char    *s;
 251 #ifdef REVERSE_LOOKUP
 252                                 hp = gethostbyaddr( (char *)
 253                                     &(from.sin_addr.s_addr),
 254                                     sizeof(from.sin_addr.s_addr), AF_INET );
 255 #else
 256                                 hp = NULL;
 257 #endif
 258
 259                                 Statslog( LDAP_DEBUG_STATS,
 260                                     "conn=%d fd=%d connection from %s (%s)\n",
 261                                     c[ns].c_connid, ns, hp == NULL ? "unknown"
 262                                     : hp->h_name, inet_ntoa( from.sin_addr ),
 263                                     0 );
 264
 265                                 if ( c[ns].c_addr != NULL ) {
 266                                         free( c[ns].c_addr );
 267                                 }
 268                                 c[ns].c_addr = strdup( inet_ntoa(
 269                                     from.sin_addr ) );
 270                                 if ( c[ns].c_domain != NULL ) {
 271                                         free( c[ns].c_domain );
 272                                 }
 273                                 c[ns].c_domain = strdup( hp == NULL ? "" :
 274                                     hp->h_name );
 275                                 /* normalize the domain */
 276                                 for ( s = c[ns].c_domain; *s; s++ ) {
 277                                         *s = TOLOWER( *s );
 278                                 }
 279                         } else {
 280                                 Statslog( LDAP_DEBUG_STATS,
 281                                     "conn=%d fd=%d connection from unknown\n",
 282                                     c[ns].c_connid, ns, 0, 0, 0 );
 283                         }
 284                         pthread_mutex_lock( &c[ns].c_dnmutex );
 285                         if ( c[ns].c_dn != NULL ) {
 286                                 free( c[ns].c_dn );
 287                                 c[ns].c_dn = NULL;
 288                         }
 289                         pthread_mutex_unlock( &c[ns].c_dnmutex );
 290                         c[ns].c_starttime = currenttime;
 291                         c[ns].c_opsinitiated = 0;
 292                         c[ns].c_opscompleted = 0;
 293                 }
 294                 pthread_mutex_unlock( &new_conn_mutex );
 295
 296                 Debug( LDAP_DEBUG_CONNS, "activity on:", 0, 0, 0 );
 297                 for ( i = 0; i < dtblsize; i++ ) {
 298                         int     r, w;
 299
 300                         r = FD_ISSET( i, &readfds );
 301                         w = FD_ISSET( i, &writefds );
 302                         if ( i != tcps && (r || w) ) {
 303                                 Debug( LDAP_DEBUG_CONNS, " %d%s%s", i,
 304                                     r ? "r" : "", w ? "w" : "" );
 305                         }
 306                 }
 307                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 308
 309                 for ( i = 0; i < dtblsize; i++ ) {
 310                         if ( i == tcps || (! FD_ISSET( i, &readfds ) &&
 311                             ! FD_ISSET( i, &writefds )) ) {
 312                                 continue;
 313                         }
 314
 315                         if ( FD_ISSET( i, &writefds ) ) {
 316                                 Debug( LDAP_DEBUG_CONNS,
 317                                     "signaling write waiter on %d\n", i, 0, 0 );
 318
 319                                 pthread_mutex_lock( &active_threads_mutex );
 320                                 pthread_cond_signal( &c[i].c_wcv );
 321                                 c[i].c_writewaiter = 0;
 322                                 active_threads++;
 323                                 pthread_mutex_unlock( &active_threads_mutex );
 324                         }
 325
 326                         if ( FD_ISSET( i, &readfds ) ) {
 327                                 Debug( LDAP_DEBUG_CONNS,
 328                                     "read activity on %d\n", i, 0, 0 );
 329
 330                                 connection_activity( &c[i] );
 331                         }
 332                 }
 333
 334                 pthread_yield();
 335         }
 336
 337         close( tcps );
 338         pthread_mutex_lock( &active_threads_mutex );
 339         Debug( LDAP_DEBUG_ANY,
 340             "slapd shutting down - waiting for %d threads to terminate\n",
 341             active_threads, 0, 0 );
 342         while ( active_threads > 0 ) {
 343                 pthread_mutex_unlock( &active_threads_mutex );
 344                 pthread_yield();
 345                 pthread_mutex_lock( &active_threads_mutex );
 346         }
 347         pthread_mutex_unlock( &active_threads_mutex );
 348
 349         /* let backends do whatever cleanup they need to do */
 350         Debug( LDAP_DEBUG_TRACE,
 351             "slapd shutting down - waiting for backends to close down\n", 0, 0,
 352             0 );
 353         be_close();
 354         Debug( LDAP_DEBUG_ANY, "slapd stopping\n", 0, 0, 0 );
 355 }
 356
 357 static void
 358 set_shutdown()
 359 {
 360         Debug( LDAP_DEBUG_ANY, "slapd got shutdown signal\n", 0, 0, 0 );
 361         slapd_shutdown = 1;
 362         pthread_kill( listener_tid, SIGUSR1 );
 363         (void) SIGNAL( SIGUSR2, (void *) set_shutdown );
 364         (void) SIGNAL( SIGTERM, (void *) set_shutdown );
 365         (void) SIGNAL( SIGHUP, (void *) set_shutdown );
 366 }
 367
 368 static void
 369 do_nothing()
 370 {
 371         Debug( LDAP_DEBUG_TRACE, "slapd got SIGUSR1\n", 0, 0, 0 );
 372         (void) SIGNAL( SIGUSR1, (void *) do_nothing );
 373 }