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 volatile sig_atomic_t slapd_shutdown = 0;
  40 static void     set_shutdown(int sig);
  41 static void     do_nothing  (int sig);
  42
  43 /* we need the server's name for constructing the pid/args file names */
  44 #if defined( SLAPD_PIDFILE ) || defined( SLAPD_ARGSFILE )
  45 extern char  *serverName;
  46 #define DEFAULT_SERVERNAME  "slapd"
  47 #endif
  48
  49 void *
  50 slapd_daemon(
  51     void *port
  52 )
  53 {
  54         Operation               *o;
  55         BerElement              ber;
  56         unsigned long           len, tag, msgid;
  57         int                     i;
  58         int                     tcps, ns;
  59         struct sockaddr_in      addr;
  60         fd_set                  readfds;
  61         fd_set                  writefds;
  62         FILE                    *fp;
  63         int                     on = 1;
  64
  65 #ifdef SLAPD_PIDFILE
  66     char            pidFile[BUFSIZ];
  67 #endif
  68 #ifdef SLAPD_ARGSFILE
  69     char            argsFile[BUFSIZ];
  70 #endif
  71
  72 #ifdef HAVE_SYSCONF
  73         dtblsize = sysconf( _SC_OPEN_MAX );
  74 #elif HAVE_GETDTABLESIZE
  75         dtblsize = getdtablesize();
  76 #else
  77         dtblsize = FD_SETSIZE
  78 #endif
  79
  80 #ifdef FD_SETSIZE
  81         if(dtblsize > FD_SETSIZE) {
  82                 dtblsize = FD_SETSIZE;
  83         }
  84 #endif  /* !FD_SETSIZE */
  85
  86         c = (Connection *) ch_calloc( 1, dtblsize * sizeof(Connection) );
  87
  88         for ( i = 0; i < dtblsize; i++ ) {
  89                 c[i].c_dn = NULL;
  90                 c[i].c_addr = NULL;
  91                 c[i].c_domain = NULL;
  92                 c[i].c_ops = NULL;
  93                 c[i].c_sb.sb_sd = -1;
  94                 c[i].c_sb.sb_options = LBER_NO_READ_AHEAD;
  95                 c[i].c_sb.sb_naddr = 0;
  96                 c[i].c_sb.sb_ber.ber_buf = NULL;
  97                 c[i].c_sb.sb_ber.ber_ptr = NULL;
  98                 c[i].c_sb.sb_ber.ber_end = NULL;
  99                 c[i].c_writewaiter = 0;
 100                 c[i].c_connid = 0;
 101                 pthread_mutex_init( &c[i].c_dnmutex,
 102                     pthread_mutexattr_default );
 103                 pthread_mutex_init( &c[i].c_opsmutex,
 104                     pthread_mutexattr_default );
 105                 pthread_mutex_init( &c[i].c_pdumutex,
 106                     pthread_mutexattr_default );
 107                 pthread_cond_init( &c[i].c_wcv, pthread_condattr_default );
 108         }
 109
 110         if ( (tcps = socket( AF_INET, SOCK_STREAM, 0 )) == -1 ) {
 111                 Debug( LDAP_DEBUG_ANY, "socket() failed errno %d (%s)", errno,
 112                     errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 113                     "unknown", 0 );
 114                 exit( 1 );
 115         }
 116
 117         i = 1;
 118         if ( setsockopt( tcps, SOL_SOCKET, SO_REUSEADDR, (char *) &i,
 119             sizeof(i) ) == -1 ) {
 120                 Debug( LDAP_DEBUG_ANY, "setsockopt() failed errno %d (%s)",
 121                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 122                     "unknown", 0 );
 123         }
 124
 125         (void) memset( (void *) &addr, '\0', sizeof(addr) );
 126         addr.sin_family = AF_INET;
 127         addr.sin_addr.s_addr = INADDR_ANY;
 128         addr.sin_port = htons( (int)port );
 129         if ( bind( tcps, (struct sockaddr *) &addr, sizeof(addr) ) == -1 ) {
 130                 Debug( LDAP_DEBUG_ANY, "bind() failed errno %d (%s)\n",
 131                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 132                     "unknown", 0 );
 133                 exit( 1 );
 134         }
 135
 136         if ( listen( tcps, 5 ) == -1 ) {
 137                 Debug( LDAP_DEBUG_ANY, "listen() failed errno %d (%s)",
 138                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 139                     "unknown", 0 );
 140                 exit( 1 );
 141         }
 142
 143         (void) SIGNAL( SIGPIPE, SIG_IGN );
 144         (void) SIGNAL( LDAP_SIGUSR1, do_nothing );
 145         (void) SIGNAL( LDAP_SIGUSR2, set_shutdown );
 146         (void) SIGNAL( SIGTERM, set_shutdown );
 147         (void) SIGNAL( SIGINT, set_shutdown );
 148         (void) SIGNAL( SIGHUP, set_shutdown );
 149
 150         Debug( LDAP_DEBUG_ANY, "slapd starting\n", 0, 0, 0 );
 151
 152 #if defined( SLAPD_PIDFILE ) || defined( SLAPD_ARGSFILE )
 153     if ( !serverName ) serverName = DEFAULT_SERVERNAME;
 154 #endif
 155
 156 #ifdef SLAPD_PIDFILE
 157     sprintf( pidFile, "%s%s%s", SLAPD_PIDDIR, serverName, SLAPD_PIDEXT );
 158         if ( (fp = fopen( pidFile, "w" )) != NULL ) {
 159                 fprintf( fp, "%d\n", (int) getpid() );
 160                 fclose( fp );
 161         }
 162 #endif
 163 #ifdef SLAPD_ARGSFILE
 164     sprintf( argsFile, "%s%s%s", SLAPD_ARGSDIR, serverName, SLAPD_ARGSEXT );
 165         if ( (fp = fopen( argsFile, "w" )) != NULL ) {
 166                 for ( i = 0; i < g_argc; i++ ) {
 167                         fprintf( fp, "%s ", g_argv[i] );
 168                 }
 169                 fprintf( fp, "\n" );
 170                 fclose( fp );
 171         }
 172 #endif
 173
 174         while ( !slapd_shutdown ) {
 175                 struct sockaddr_in      from;
 176                 struct hostent          *hp;
 177                 struct timeval          zero;
 178                 struct timeval          *tvp;
 179                 int                     len, pid;
 180
 181                 char    *client_name;
 182                 char    *client_addr;
 183
 184                 FD_ZERO( &writefds );
 185                 FD_ZERO( &readfds );
 186                 FD_SET( tcps, &readfds );
 187
 188                 zero.tv_sec = 0;
 189                 zero.tv_usec = 0;
 190
 191                 pthread_mutex_lock( &active_threads_mutex );
 192                 Debug( LDAP_DEBUG_CONNS,
 193                     "listening for connections on %d, activity on:",
 194                     tcps, 0, 0 );
 195
 196                 pthread_mutex_lock( &new_conn_mutex );
 197                 for ( i = 0; i < dtblsize; i++ ) {
 198                         if ( c[i].c_sb.sb_sd != -1 ) {
 199                                 FD_SET( c[i].c_sb.sb_sd, &readfds );
 200
 201                                 if ( c[i].c_writewaiter ) {
 202                                         FD_SET( c[i].c_sb.sb_sd, &writefds );
 203                                 }
 204                                 Debug( LDAP_DEBUG_CONNS, " %dr%s", i,
 205                                     c[i].c_writewaiter ? "w" : "", 0 );
 206                         }
 207                 }
 208                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 209                 pthread_mutex_unlock( &new_conn_mutex );
 210
 211                 Debug( LDAP_DEBUG_CONNS, "before select active_threads %d\n",
 212                     active_threads, 0, 0 );
 213 #if defined( HAVE_YIELDING_SELECT ) || defined( NO_THREADS )
 214                 tvp = NULL;
 215 #else
 216                 tvp = active_threads ? &zero : NULL;
 217 #endif
 218                 pthread_mutex_unlock( &active_threads_mutex );
 219
 220                 switch ( i = select( dtblsize, &readfds, &writefds, 0, tvp ) ) {
 221                 case -1:        /* failure - try again */
 222                         Debug( LDAP_DEBUG_CONNS,
 223                             "select failed errno %d (%s)\n",
 224                             errno, errno > -1 && errno < sys_nerr ?
 225                             sys_errlist[errno] : "unknown", 0 );
 226                         continue;
 227
 228                 case 0:         /* timeout - let threads run */
 229                         Debug( LDAP_DEBUG_CONNS, "select timeout - yielding\n",
 230                             0, 0, 0 );
 231                         pthread_yield();
 232                         continue;
 233
 234                 default:        /* something happened - deal with it */
 235                         Debug( LDAP_DEBUG_CONNS, "select activity on %d descriptors\n", i, 0, 0 );
 236                         ;       /* FALL */
 237                 }
 238                 pthread_mutex_lock( &currenttime_mutex );
 239                 time( &currenttime );
 240                 pthread_mutex_unlock( &currenttime_mutex );
 241
 242                 /* new connection */
 243                 pthread_mutex_lock( &new_conn_mutex );
 244                 if ( FD_ISSET( tcps, &readfds ) ) {
 245                         len = sizeof(from);
 246                         if ( (ns = accept( tcps, (struct sockaddr *) &from,
 247                             &len )) == -1 ) {
 248                                 Debug( LDAP_DEBUG_ANY,
 249                                     "accept() failed errno %d (%s)", errno,
 250                                     errno > -1 && errno < sys_nerr ?
 251                                     sys_errlist[errno] : "unknown", 0 );
 252                                 pthread_mutex_unlock( &new_conn_mutex );
 253                                 continue;
 254                         }
 255                         if ( ioctl( ns, FIONBIO, (caddr_t) &on ) == -1 ) {
 256                                 Debug( LDAP_DEBUG_ANY,
 257                                     "FIONBIO ioctl on %d failed\n", ns, 0, 0 );
 258                         }
 259
 260                         c[ns].c_sb.sb_sd = ns;
 261                         Debug( LDAP_DEBUG_CONNS, "new connection on %d\n", ns,
 262                             0, 0 );
 263
 264                         pthread_mutex_lock( &ops_mutex );
 265                         c[ns].c_connid = num_conns++;
 266                         pthread_mutex_unlock( &ops_mutex );
 267
 268                         len = sizeof(from);
 269
 270                         if ( getpeername( ns, (struct sockaddr *) &from, &len )
 271                             == 0 ) {
 272                                 char *s;
 273                                 client_addr = inet_ntoa( from.sin_addr );
 274
 275 #if defined(SLAPD_RLOOKUPS) || defined(HAVE_TCPD)
 276                                 hp = gethostbyaddr( (char *)
 277                                     &(from.sin_addr.s_addr),
 278                                     sizeof(from.sin_addr.s_addr), AF_INET );
 279
 280                                 if(hp) {
 281                                         client_name = hp->h_name;
 282
 283                                         /* normalize the domain */
 284                                         for ( s = client_name; *s; s++ ) {
 285                                                 *s = TOLOWER( *s );
 286                                         }
 287
 288                                 } else {
 289                                         client_name = NULL;
 290                                 }
 291 #else
 292                                 client_name = NULL;
 293 #endif
 294
 295                         } else {
 296                                 client_name = NULL;;
 297                                 client_addr = NULL;
 298                         }
 299
 300 #ifdef HAVE_TCPD
 301                         if(!hosts_ctl("slapd", client_name, client_addr,
 302                                 STRING_UNKNOWN))
 303                         {
 304                                 /* DENY ACCESS */
 305                                 Statslog( LDAP_DEBUG_STATS,
 306                                  "conn=%d fd=%d connection from %s (%s) denied.\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                                 close(ns);
 313                                 pthread_mutex_unlock( &new_conn_mutex );
 314                                 continue;
 315                         }
 316 #endif /* HAVE_TCPD */
 317
 318                         Statslog( LDAP_DEBUG_STATS,
 319                             "conn=%d fd=%d connection from %s (%s) accepted.\n",
 320                                 c[ns].c_connid, ns,
 321                                         client_name == NULL ? "unknown" : client_name,
 322                                         client_addr == NULL ? "unknown" : client_addr,
 323                              0 );
 324
 325                         if ( c[ns].c_addr != NULL ) {
 326                                 free( c[ns].c_addr );
 327                         }
 328                         c[ns].c_addr = ch_strdup( client_addr );
 329
 330                         if ( c[ns].c_domain != NULL ) {
 331                                 free( c[ns].c_domain );
 332                         }
 333
 334                         c[ns].c_domain = ch_strdup( client_name == NULL
 335                                 ? "" : client_name );
 336
 337                         pthread_mutex_lock( &c[ns].c_dnmutex );
 338                         if ( c[ns].c_dn != NULL ) {
 339                                 free( c[ns].c_dn );
 340                                 c[ns].c_dn = NULL;
 341                         }
 342                         pthread_mutex_unlock( &c[ns].c_dnmutex );
 343                         c[ns].c_starttime = currenttime;
 344                         c[ns].c_opsinitiated = 0;
 345                         c[ns].c_opscompleted = 0;
 346                 }
 347                 pthread_mutex_unlock( &new_conn_mutex );
 348
 349                 Debug( LDAP_DEBUG_CONNS, "activity on:", 0, 0, 0 );
 350                 for ( i = 0; i < dtblsize; i++ ) {
 351                         int     r, w;
 352
 353                         r = FD_ISSET( i, &readfds );
 354                         w = FD_ISSET( i, &writefds );
 355                         if ( i != tcps && (r || w) ) {
 356                                 Debug( LDAP_DEBUG_CONNS, " %d%s%s", i,
 357                                     r ? "r" : "", w ? "w" : "" );
 358                         }
 359                 }
 360                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 361
 362                 for ( i = 0; i < dtblsize; i++ ) {
 363                         if ( i == tcps || (! FD_ISSET( i, &readfds ) &&
 364                             ! FD_ISSET( i, &writefds )) ) {
 365                                 continue;
 366                         }
 367
 368                         if ( FD_ISSET( i, &writefds ) ) {
 369                                 Debug( LDAP_DEBUG_CONNS,
 370                                     "signaling write waiter on %d\n", i, 0, 0 );
 371
 372                                 pthread_mutex_lock( &active_threads_mutex );
 373                                 pthread_cond_signal( &c[i].c_wcv );
 374                                 c[i].c_writewaiter = 0;
 375                                 active_threads++;
 376                                 pthread_mutex_unlock( &active_threads_mutex );
 377                         }
 378
 379                         if ( FD_ISSET( i, &readfds ) ) {
 380                                 Debug( LDAP_DEBUG_CONNS,
 381                                     "read activity on %d\n", i, 0, 0 );
 382
 383                                 connection_activity( &c[i] );
 384                         }
 385                 }
 386
 387                 pthread_yield();
 388         }
 389
 390         close( tcps );
 391         pthread_mutex_lock( &active_threads_mutex );
 392         Debug( LDAP_DEBUG_ANY,
 393             "slapd shutting down - waiting for %d threads to terminate\n",
 394             active_threads, 0, 0 );
 395         while ( active_threads > 0 ) {
 396                 pthread_mutex_unlock( &active_threads_mutex );
 397                 pthread_yield();
 398                 pthread_mutex_lock( &active_threads_mutex );
 399         }
 400         pthread_mutex_unlock( &active_threads_mutex );
 401
 402         /* let backends do whatever cleanup they need to do */
 403         Debug( LDAP_DEBUG_TRACE,
 404             "slapd shutting down - waiting for backends to close down\n", 0, 0,
 405             0 );
 406         be_close();
 407         Debug( LDAP_DEBUG_ANY, "slapd stopping\n", 0, 0, 0 );
 408         return NULL;
 409 }
 410
 411 static void
 412 set_shutdown( int sig )
 413 {
 414         Debug( LDAP_DEBUG_ANY, "slapd got shutdown signal %d\n", sig, 0, 0 );
 415         slapd_shutdown = 1;
 416         pthread_kill( listener_tid, LDAP_SIGUSR1 );
 417         (void) SIGNAL( LDAP_SIGUSR2, set_shutdown );
 418         (void) SIGNAL( SIGTERM, set_shutdown );
 419         (void) SIGNAL( SIGINT, set_shutdown );
 420         (void) SIGNAL( SIGHUP, set_shutdown );
 421 }
 422
 423 static void
 424 do_nothing( int sig )
 425 {
 426         Debug( LDAP_DEBUG_TRACE, "slapd got do_nothing signal %d\n", sig, 0, 0 );
 427         (void) SIGNAL( LDAP_SIGUSR1, do_nothing );
 428 }