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
  41 /* a link to the slapd.conf configuration parameters */
  42 extern char *slapd_pid_file;
  43 extern char *slapd_args_file;
  44
  45 void *
  46 slapd_daemon(
  47     void *port
  48 )
  49 {
  50         Operation               *o;
  51         BerElement              ber;
  52         unsigned long           len, tag, msgid;
  53         int                     i;
  54         int                     tcps, ns;
  55         struct sockaddr_in      addr;
  56         fd_set                  readfds;
  57         fd_set                  writefds;
  58         FILE                    *fp;
  59         int                     on = 1;
  60
  61 #ifdef HAVE_SYSCONF
  62         dtblsize = sysconf( _SC_OPEN_MAX );
  63 #elif HAVE_GETDTABLESIZE
  64         dtblsize = getdtablesize();
  65 #else
  66         dtblsize = FD_SETSIZE
  67 #endif
  68
  69 #ifdef FD_SETSIZE
  70         if(dtblsize > FD_SETSIZE) {
  71                 dtblsize = FD_SETSIZE;
  72         }
  73 #endif  /* !FD_SETSIZE */
  74
  75         c = (Connection *) ch_calloc( 1, dtblsize * sizeof(Connection) );
  76
  77         for ( i = 0; i < dtblsize; i++ ) {
  78                 c[i].c_dn = NULL;
  79                 c[i].c_cdn = NULL;
  80                 c[i].c_addr = NULL;
  81                 c[i].c_domain = NULL;
  82                 c[i].c_ops = NULL;
  83                 c[i].c_sb.sb_sd = -1;
  84                 c[i].c_sb.sb_options = LBER_NO_READ_AHEAD;
  85                 c[i].c_sb.sb_naddr = 0;
  86                 c[i].c_sb.sb_ber.ber_buf = NULL;
  87                 c[i].c_sb.sb_ber.ber_ptr = NULL;
  88                 c[i].c_sb.sb_ber.ber_end = NULL;
  89                 c[i].c_writewaiter = 0;
  90                 c[i].c_connid = 0;
  91                 ldap_pvt_thread_mutex_init( &c[i].c_dnmutex );
  92                 ldap_pvt_thread_mutex_init( &c[i].c_opsmutex );
  93                 ldap_pvt_thread_mutex_init( &c[i].c_pdumutex );
  94                 ldap_pvt_thread_cond_init( &c[i].c_wcv );
  95         }
  96
  97         if ( (tcps = socket( AF_INET, SOCK_STREAM, 0 )) == -1 ) {
  98                 Debug( LDAP_DEBUG_ANY, "socket() failed errno %d (%s)", errno,
  99                     errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 100                     "unknown", 0 );
 101                 exit( 1 );
 102         }
 103
 104         i = 1;
 105         if ( setsockopt( tcps, SOL_SOCKET, SO_REUSEADDR, (char *) &i,
 106             sizeof(i) ) == -1 ) {
 107                 Debug( LDAP_DEBUG_ANY, "setsockopt() failed errno %d (%s)",
 108                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 109                     "unknown", 0 );
 110         }
 111
 112         (void) memset( (void *) &addr, '\0', sizeof(addr) );
 113         addr.sin_family = AF_INET;
 114         addr.sin_addr.s_addr = INADDR_ANY;
 115         addr.sin_port = htons( (int)port );
 116         if ( bind( tcps, (struct sockaddr *) &addr, sizeof(addr) ) == -1 ) {
 117                 Debug( LDAP_DEBUG_ANY, "bind() failed errno %d (%s)\n",
 118                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 119                     "unknown", 0 );
 120                 exit( 1 );
 121         }
 122
 123         if ( listen( tcps, 5 ) == -1 ) {
 124                 Debug( LDAP_DEBUG_ANY, "listen() failed errno %d (%s)",
 125                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 126                     "unknown", 0 );
 127                 exit( 1 );
 128         }
 129
 130         Debug( LDAP_DEBUG_ANY, "slapd starting\n", 0, 0, 0 );
 131
 132         if (( slapd_pid_file != NULL ) &&
 133                         (( fp = fopen( slapd_pid_file, "w" )) != NULL )) {
 134                 fprintf( fp, "%d\n", (int) getpid() );
 135                 fclose( fp );
 136         }
 137
 138         if (( slapd_args_file != NULL ) &&
 139                         (( fp = fopen( slapd_args_file, "w" )) != NULL )) {
 140                 for ( i = 0; i < g_argc; i++ ) {
 141                         fprintf( fp, "%s ", g_argv[i] );
 142                 }
 143                 fprintf( fp, "\n" );
 144                 fclose( fp );
 145         }
 146
 147         while ( !slapd_shutdown ) {
 148                 struct sockaddr_in      from;
 149                 struct hostent          *hp;
 150                 struct timeval          zero;
 151                 struct timeval          *tvp;
 152                 int                     len, pid;
 153
 154                 char    *client_name;
 155                 char    *client_addr;
 156
 157                 FD_ZERO( &writefds );
 158                 FD_ZERO( &readfds );
 159                 FD_SET( tcps, &readfds );
 160
 161                 zero.tv_sec = 0;
 162                 zero.tv_usec = 0;
 163
 164                 ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 165                 Debug( LDAP_DEBUG_CONNS,
 166                     "listening for connections on %d, activity on:",
 167                     tcps, 0, 0 );
 168
 169                 ldap_pvt_thread_mutex_lock( &new_conn_mutex );
 170                 for ( i = 0; i < dtblsize; i++ ) {
 171                         if ( c[i].c_sb.sb_sd != -1 ) {
 172                                 FD_SET( c[i].c_sb.sb_sd, &readfds );
 173
 174                                 if ( c[i].c_writewaiter ) {
 175                                         FD_SET( c[i].c_sb.sb_sd, &writefds );
 176                                 }
 177                                 Debug( LDAP_DEBUG_CONNS, " %dr%s", i,
 178                                     c[i].c_writewaiter ? "w" : "", 0 );
 179                         }
 180                 }
 181                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 182                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 183
 184                 Debug( LDAP_DEBUG_CONNS, "before select active_threads %d\n",
 185                     active_threads, 0, 0 );
 186 #if defined( HAVE_YIELDING_SELECT ) || defined( NO_THREADS )
 187                 tvp = NULL;
 188 #else
 189                 tvp = active_threads ? &zero : NULL;
 190 #endif
 191                 ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 192
 193                 switch ( i = select( dtblsize, &readfds, &writefds, 0, tvp ) ) {
 194                 case -1:        /* failure - try again */
 195                         Debug( LDAP_DEBUG_CONNS,
 196                             "select failed errno %d (%s)\n",
 197                             errno, errno > -1 && errno < sys_nerr ?
 198                             sys_errlist[errno] : "unknown", 0 );
 199                         continue;
 200
 201                 case 0:         /* timeout - let threads run */
 202                         Debug( LDAP_DEBUG_CONNS, "select timeout - yielding\n",
 203                             0, 0, 0 );
 204                         ldap_pvt_thread_yield();
 205                         continue;
 206
 207                 default:        /* something happened - deal with it */
 208                         Debug( LDAP_DEBUG_CONNS, "select activity on %d descriptors\n", i, 0, 0 );
 209                         ;       /* FALL */
 210                 }
 211                 ldap_pvt_thread_mutex_lock( &currenttime_mutex );
 212                 time( &currenttime );
 213                 ldap_pvt_thread_mutex_unlock( &currenttime_mutex );
 214
 215                 /* new connection */
 216                 ldap_pvt_thread_mutex_lock( &new_conn_mutex );
 217                 if ( FD_ISSET( tcps, &readfds ) ) {
 218                         len = sizeof(from);
 219                         if ( (ns = accept( tcps, (struct sockaddr *) &from,
 220                             &len )) == -1 ) {
 221                                 Debug( LDAP_DEBUG_ANY,
 222                                     "accept() failed errno %d (%s)", errno,
 223                                     errno > -1 && errno < sys_nerr ?
 224                                     sys_errlist[errno] : "unknown", 0 );
 225                                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 226                                 continue;
 227                         }
 228                         if ( ioctl( ns, FIONBIO, (caddr_t) &on ) == -1 ) {
 229                                 Debug( LDAP_DEBUG_ANY,
 230                                     "FIONBIO ioctl on %d failed\n", ns, 0, 0 );
 231                         }
 232
 233                         Debug( LDAP_DEBUG_CONNS, "new connection on %d\n", ns,
 234                             0, 0 );
 235
 236                         len = sizeof(from);
 237
 238                         if ( getpeername( ns, (struct sockaddr *) &from, &len )
 239                             == 0 ) {
 240                                 char *s;
 241                                 client_addr = inet_ntoa( from.sin_addr );
 242
 243 #if defined(SLAPD_RLOOKUPS) || defined(HAVE_TCPD)
 244                                 hp = gethostbyaddr( (char *)
 245                                     &(from.sin_addr.s_addr),
 246                                     sizeof(from.sin_addr.s_addr), AF_INET );
 247
 248                                 if(hp) {
 249                                         client_name = hp->h_name;
 250
 251                                         /* normalize the domain */
 252                                         for ( s = client_name; *s; s++ ) {
 253                                                 *s = TOLOWER( (unsigned char) *s );
 254                                         }
 255
 256                                 } else {
 257                                         client_name = NULL;
 258                                 }
 259 #else
 260                                 client_name = NULL;
 261 #endif
 262
 263                         } else {
 264                                 client_name = NULL;;
 265                                 client_addr = NULL;
 266                         }
 267
 268 #ifdef HAVE_TCPD
 269                         if(!hosts_ctl("slapd",
 270                                 client_name != NULL ? client_name : STRING_UNKNOWN,
 271                                 client_addr != NULL ? client_addr : STRING_UNKNOWN,
 272                                 STRING_UNKNOWN))
 273                         {
 274                                 /* DENY ACCESS */
 275                                 Statslog( LDAP_DEBUG_ANY,
 276                                  "fd=%d connection from %s (%s) denied.\n",
 277                                         ns,
 278                                                 client_name == NULL ? "unknown" : client_name,
 279                                                 client_addr == NULL ? "unknown" : client_addr,
 280                                   0, 0 );
 281
 282                                 close(ns);
 283                                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 284                                 continue;
 285                         }
 286 #endif /* HAVE_TCPD */
 287
 288                         c[ns].c_sb.sb_sd = ns;
 289                         ldap_pvt_thread_mutex_lock( &ops_mutex );
 290                         c[ns].c_connid = num_conns++;
 291                         ldap_pvt_thread_mutex_unlock( &ops_mutex );
 292
 293                         Statslog( LDAP_DEBUG_STATS,
 294                             "conn=%d fd=%d connection from %s (%s) accepted.\n",
 295                                 c[ns].c_connid, ns,
 296                                         client_name == NULL ? "unknown" : client_name,
 297                                         client_addr == NULL ? "unknown" : client_addr,
 298                              0 );
 299
 300                         if ( c[ns].c_addr != NULL ) {
 301                                 free( c[ns].c_addr );
 302                         }
 303                         c[ns].c_addr = ch_strdup( client_addr );
 304
 305                         if ( c[ns].c_domain != NULL ) {
 306                                 free( c[ns].c_domain );
 307                         }
 308
 309                         c[ns].c_domain = ch_strdup( client_name == NULL
 310                                 ? "" : client_name );
 311
 312                         ldap_pvt_thread_mutex_lock( &c[ns].c_dnmutex );
 313                         if ( c[ns].c_dn != NULL ) {
 314                                 free( c[ns].c_dn );
 315                                 c[ns].c_dn = NULL;
 316                         }
 317                         if ( c[ns].c_cdn != NULL ) {
 318                                 free( c[ns].c_cdn );
 319                                 c[ns].c_cdn = NULL;
 320                         }
 321                         ldap_pvt_thread_mutex_unlock( &c[ns].c_dnmutex );
 322                         c[ns].c_starttime = currenttime;
 323                         c[ns].c_opsinitiated = 0;
 324                         c[ns].c_opscompleted = 0;
 325                 }
 326                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 327
 328                 Debug( LDAP_DEBUG_CONNS, "activity on:", 0, 0, 0 );
 329                 for ( i = 0; i < dtblsize; i++ ) {
 330                         int     r, w;
 331
 332                         r = FD_ISSET( i, &readfds );
 333                         w = FD_ISSET( i, &writefds );
 334                         if ( i != tcps && (r || w) ) {
 335                                 Debug( LDAP_DEBUG_CONNS, " %d%s%s", i,
 336                                     r ? "r" : "", w ? "w" : "" );
 337                         }
 338                 }
 339                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 340
 341                 for ( i = 0; i < dtblsize; i++ ) {
 342                         if ( i == tcps || (! FD_ISSET( i, &readfds ) &&
 343                             ! FD_ISSET( i, &writefds )) ) {
 344                                 continue;
 345                         }
 346
 347                         if ( FD_ISSET( i, &writefds ) ) {
 348                                 Debug( LDAP_DEBUG_CONNS,
 349                                     "signaling write waiter on %d\n", i, 0, 0 );
 350
 351                                 ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 352                                 active_threads++;
 353                                 c[i].c_writewaiter = 0;
 354                                 ldap_pvt_thread_cond_signal( &c[i].c_wcv );
 355                                 ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 356                         }
 357
 358                         if ( FD_ISSET( i, &readfds ) ) {
 359                                 Debug( LDAP_DEBUG_CONNS,
 360                                     "read activity on %d\n", i, 0, 0 );
 361
 362                                 connection_activity( &c[i] );
 363                         }
 364                 }
 365
 366                 ldap_pvt_thread_yield();
 367         }
 368
 369         close( tcps );
 370
 371         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 372         Debug( LDAP_DEBUG_ANY,
 373             "slapd shutting down - waiting for %d threads to terminate\n",
 374             active_threads, 0, 0 );
 375         while ( active_threads > 0 ) {
 376                 ldap_pvt_thread_cond_wait(&active_threads_cond, &active_threads_mutex);
 377         }
 378         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 379
 380         /* let backends do whatever cleanup they need to do */
 381         Debug( LDAP_DEBUG_TRACE,
 382             "slapd shutting down - waiting for backends to close down\n", 0, 0,
 383             0 );
 384         be_close();
 385         Debug( LDAP_DEBUG_ANY, "slapd stopping\n", 0, 0, 0 );
 386
 387         return NULL;
 388 }
 389
 390 void
 391 slap_set_shutdown( int sig )
 392 {
 393         slapd_shutdown = 1;
 394         ldap_pvt_thread_kill( listener_tid, LDAP_SIGUSR1 );
 395
 396         /* reinstall self */
 397         (void) SIGNAL( sig, slap_set_shutdown );
 398 }
 399
 400 void
 401 slap_do_nothing( int sig )
 402 {
 403         /* reinstall self */
 404         (void) SIGNAL( sig, slap_do_nothing );
 405 }