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 LDAP_DEBUG
  30 #include <assert.h>
  31 #else
  32 #define assert( cond )
  33 #endif
  34
  35 #ifdef HAVE_TCPD
  36 #include <tcpd.h>
  37
  38 int allow_severity = LOG_INFO;
  39 int deny_severity = LOG_NOTICE;
  40 #endif /* TCP Wrappers */
  41
  42 int             dtblsize;
  43 Connection      *c;
  44
  45 static volatile sig_atomic_t slapd_shutdown = 0;
  46
  47 /* a link to the slapd.conf configuration parameters */
  48 extern char *slapd_pid_file;
  49 extern char *slapd_args_file;
  50
  51 void *
  52 slapd_daemon(
  53     void *port
  54 )
  55 {
  56         Operation               *o;
  57         BerElement              ber;
  58         unsigned long           len, tag, msgid;
  59         int                     i;
  60         int                     tcps, ns;
  61         struct sockaddr_in      addr;
  62         fd_set                  readfds;
  63         fd_set                  writefds;
  64         FILE                    *fp;
  65         int                     on = 1;
  66
  67 #ifdef HAVE_SYSCONF
  68         dtblsize = sysconf( _SC_OPEN_MAX );
  69 #elif HAVE_GETDTABLESIZE
  70         dtblsize = getdtablesize();
  71 #else
  72         dtblsize = FD_SETSIZE
  73 #endif
  74
  75 #ifdef FD_SETSIZE
  76         if(dtblsize > FD_SETSIZE) {
  77                 dtblsize = FD_SETSIZE;
  78         }
  79 #endif  /* !FD_SETSIZE */
  80
  81         c = (Connection *) ch_calloc( 1, dtblsize * sizeof(Connection) );
  82
  83         for ( i = 0; i < dtblsize; i++ ) {
  84                 c[i].c_dn = NULL;
  85                 c[i].c_cdn = NULL;
  86                 c[i].c_addr = NULL;
  87                 c[i].c_domain = NULL;
  88                 c[i].c_ops = NULL;
  89                 lber_pvt_sb_init( &c[i].c_sb );
  90                 c[i].c_writewaiter = 0;
  91                 c[i].c_connid = 0;
  92                 ldap_pvt_thread_mutex_init( &c[i].c_dnmutex );
  93                 ldap_pvt_thread_mutex_init( &c[i].c_opsmutex );
  94                 ldap_pvt_thread_mutex_init( &c[i].c_pdumutex );
  95                 ldap_pvt_thread_cond_init( &c[i].c_wcv );
  96         }
  97
  98         if ( (tcps = socket( AF_INET, SOCK_STREAM, 0 )) == -1 ) {
  99                 Debug( LDAP_DEBUG_ANY, "socket() failed errno %d (%s)", errno,
 100                     errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 101                     "unknown", 0 );
 102                 exit( 1 );
 103         }
 104
 105         i = 1;
 106         if ( setsockopt( tcps, SOL_SOCKET, SO_REUSEADDR, (char *) &i,
 107             sizeof(i) ) == -1 ) {
 108                 Debug( LDAP_DEBUG_ANY, "setsockopt() failed errno %d (%s)",
 109                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 110                     "unknown", 0 );
 111         }
 112
 113         (void) memset( (void *) &addr, '\0', sizeof(addr) );
 114         addr.sin_family = AF_INET;
 115         addr.sin_addr.s_addr = INADDR_ANY;
 116         addr.sin_port = htons( (int)port );
 117         if ( bind( tcps, (struct sockaddr *) &addr, sizeof(addr) ) == -1 ) {
 118                 Debug( LDAP_DEBUG_ANY, "bind() failed errno %d (%s)\n",
 119                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 120                     "unknown", 0 );
 121                 exit( 1 );
 122         }
 123
 124         if ( listen( tcps, 5 ) == -1 ) {
 125                 Debug( LDAP_DEBUG_ANY, "listen() failed errno %d (%s)",
 126                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 127                     "unknown", 0 );
 128                 exit( 1 );
 129         }
 130
 131         Debug( LDAP_DEBUG_ANY, "slapd starting\n", 0, 0, 0 );
 132
 133         if (( slapd_pid_file != NULL ) &&
 134                         (( fp = fopen( slapd_pid_file, "w" )) != NULL )) {
 135                 fprintf( fp, "%d\n", (int) getpid() );
 136                 fclose( fp );
 137         }
 138
 139         if (( slapd_args_file != NULL ) &&
 140                         (( fp = fopen( slapd_args_file, "w" )) != NULL )) {
 141                 for ( i = 0; i < g_argc; i++ ) {
 142                         fprintf( fp, "%s ", g_argv[i] );
 143                 }
 144                 fprintf( fp, "\n" );
 145                 fclose( fp );
 146         }
 147
 148         while ( !slapd_shutdown ) {
 149                 struct sockaddr_in      from;
 150                 struct hostent          *hp;
 151                 struct timeval          zero;
 152                 struct timeval          *tvp;
 153                 int                     len, pid;
 154                 int                     data_ready;
 155
 156                 char    *client_name;
 157                 char    *client_addr;
 158
 159                 FD_ZERO( &writefds );
 160                 FD_ZERO( &readfds );
 161                 FD_SET( tcps, &readfds );
 162
 163                 zero.tv_sec = 0;
 164                 zero.tv_usec = 0;
 165
 166                 ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 167                 Debug( LDAP_DEBUG_CONNS,
 168                     "listening for connections on %d, activity on:",
 169                     tcps, 0, 0 );
 170
 171                 data_ready = 0;
 172
 173                 ldap_pvt_thread_mutex_lock( &new_conn_mutex );
 174                 for ( i = 0; i < dtblsize; i++ ) {
 175                         if ( lber_pvt_sb_in_use( &c[i].c_sb )) {
 176                                 FD_SET( lber_pvt_sb_get_desc(&c[i].c_sb),
 177                                         &readfds );
 178                                 if (lber_pvt_sb_data_ready(&c[i].c_sb))
 179                                         data_ready = 1;
 180                                 if ( c[i].c_writewaiter ) {
 181                                         FD_SET( lber_pvt_sb_get_desc(&c[i].c_sb),
 182                                                 &writefds );
 183                                 }
 184                                 Debug( LDAP_DEBUG_CONNS, " %dr%s", i,
 185                                     c[i].c_writewaiter ? "w" : "", 0 );
 186                         }
 187                 }
 188                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 189                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 190
 191                 Debug( LDAP_DEBUG_CONNS, "before select active_threads %d\n",
 192                     active_threads, 0, 0 );
 193 #if defined( HAVE_YIELDING_SELECT ) || defined( NO_THREADS )
 194                 tvp = (data_ready) ? &zero : NULL;
 195 #else
 196                 tvp = (active_threads || data_ready) ? &zero : NULL;
 197 #endif
 198                 ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 199
 200                 switch ( i = select( dtblsize, &readfds, &writefds, 0, tvp ) ) {
 201                 case -1:        /* failure - try again */
 202                         Debug( LDAP_DEBUG_CONNS,
 203                             "select failed errno %d (%s)\n",
 204                             errno, errno > -1 && errno < sys_nerr ?
 205                             sys_errlist[errno] : "unknown", 0 );
 206                         continue;
 207
 208                 case 0:         /* timeout - let threads run */
 209                         Debug( LDAP_DEBUG_CONNS, "select timeout - yielding\n",
 210                             0, 0, 0 );
 211                         if (!data_ready)
 212                                 ldap_pvt_thread_yield();
 213                         continue;
 214
 215                 default:        /* something happened - deal with it */
 216                         Debug( LDAP_DEBUG_CONNS, "select activity on %d descriptors\n", i, 0, 0 );
 217                         ;       /* FALL */
 218                 }
 219                 ldap_pvt_thread_mutex_lock( &currenttime_mutex );
 220                 time( &currenttime );
 221                 ldap_pvt_thread_mutex_unlock( &currenttime_mutex );
 222
 223                 /* new connection */
 224                 ldap_pvt_thread_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                                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 234                                 continue;
 235                         }
 236
 237                         lber_pvt_sb_set_desc( &c[ns].c_sb, ns );
 238                         lber_pvt_sb_set_io( &c[ns].c_sb, &lber_pvt_sb_io_tcp, NULL );
 239
 240                         if (lber_pvt_sb_set_nonblock( &c[ns].c_sb, 1)<0) {
 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( (unsigned char) *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                                 lber_pvt_sb_close( &c[ns].c_sb );
 295                                 lber_pvt_sb_destroy( &c[ns].c_sb );
 296                                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 297                                 continue;
 298                         }
 299 #endif /* HAVE_TCPD */
 300
 301
 302                         ldap_pvt_thread_mutex_lock( &ops_mutex );
 303                         c[ns].c_connid = num_conns++;
 304                         ldap_pvt_thread_mutex_unlock( &ops_mutex );
 305
 306                         Statslog( LDAP_DEBUG_STATS,
 307                             "conn=%d fd=%d connection from %s (%s) accepted.\n",
 308                                 c[ns].c_connid, ns,
 309                                         client_name == NULL ? "unknown" : client_name,
 310                                         client_addr == NULL ? "unknown" : client_addr,
 311                              0 );
 312
 313                         if ( c[ns].c_addr != NULL ) {
 314                                 free( c[ns].c_addr );
 315                         }
 316                         c[ns].c_addr = ch_strdup( client_addr );
 317
 318                         if ( c[ns].c_domain != NULL ) {
 319                                 free( c[ns].c_domain );
 320                         }
 321
 322                         c[ns].c_domain = ch_strdup( client_name == NULL
 323                                 ? "" : client_name );
 324
 325                         ldap_pvt_thread_mutex_lock( &c[ns].c_dnmutex );
 326                         if ( c[ns].c_dn != NULL ) {
 327                                 free( c[ns].c_dn );
 328                                 c[ns].c_dn = NULL;
 329                         }
 330                         if ( c[ns].c_cdn != NULL ) {
 331                                 free( c[ns].c_cdn );
 332                                 c[ns].c_cdn = NULL;
 333                         }
 334                         ldap_pvt_thread_mutex_unlock( &c[ns].c_dnmutex );
 335                         c[ns].c_starttime = currenttime;
 336                         c[ns].c_opsinitiated = 0;
 337                         c[ns].c_opscompleted = 0;
 338                 }
 339                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 340
 341                 Debug( LDAP_DEBUG_CONNS, "activity on:", 0, 0, 0 );
 342                 for ( i = 0; i < dtblsize; i++ ) {
 343                         int     r, w;
 344
 345                         r = FD_ISSET( i, &readfds );
 346                         w = FD_ISSET( i, &writefds );
 347                         if ( i != tcps && (r || w) ) {
 348                                 Debug( LDAP_DEBUG_CONNS, " %d%s%s", i,
 349                                     r ? "r" : "", w ? "w" : "" );
 350                         }
 351                 }
 352                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 353
 354                 for ( i = 0; i < dtblsize; i++ ) {
 355                         if ( i == tcps || (! FD_ISSET( i, &readfds ) &&
 356                             ! FD_ISSET( i, &writefds )) ) {
 357                                 continue;
 358                         }
 359
 360                         if ( FD_ISSET( i, &writefds ) ) {
 361                                 Debug( LDAP_DEBUG_CONNS,
 362                                     "signaling write waiter on %d\n", i, 0, 0 );
 363
 364                                 ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 365                                 active_threads++;
 366                                 c[i].c_writewaiter = 0;
 367                                 ldap_pvt_thread_cond_signal( &c[i].c_wcv );
 368                                 ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 369                         }
 370
 371                         if ( FD_ISSET( i, &readfds ) ||
 372                                 lber_pvt_sb_data_ready( &c[i].c_sb ) ) {
 373                                 Debug( LDAP_DEBUG_CONNS,
 374                                     "read activity on %d\n", i, 0, 0 );
 375
 376                                 connection_activity( &c[i] );
 377                         }
 378                 }
 379
 380                 ldap_pvt_thread_yield();
 381         }
 382
 383         Debug( LDAP_DEBUG_TRACE,
 384             "slapd shutdown: shutdown initiated.\n",
 385             0, 0, 0 );
 386
 387         close( tcps );
 388
 389         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 390         Debug( LDAP_DEBUG_ANY,
 391             "slapd shutdown: waiting for %d threads to terminate\n",
 392             active_threads, 0, 0 );
 393         while ( active_threads > 0 ) {
 394                 ldap_pvt_thread_cond_wait(&active_threads_cond, &active_threads_mutex);
 395         }
 396         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 397
 398         return NULL;
 399 }
 400
 401 void
 402 slap_set_shutdown( int sig )
 403 {
 404         Debug( LDAP_DEBUG_ANY, "slapd got shutdown signal %d\n", sig, 0, 0 );
 405         slapd_shutdown = 1;
 406         ldap_pvt_thread_kill( listener_tid, LDAP_SIGUSR1 );
 407
 408         /* reinstall self */
 409         (void) SIGNAL( sig, slap_set_shutdown );
 410 }
 411
 412 void
 413 slap_do_nothing( int sig )
 414 {
 415         Debug( LDAP_DEBUG_TRACE, "slapd got do_nothing signal %d\n", sig, 0, 0 );
 416
 417         /* reinstall self */
 418         (void) SIGNAL( sig, slap_do_nothing );
 419 }