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

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