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 /* a link to the slapd.conf configuration parameters */
  44 extern char *slapd_pid_file;
  45 extern char *slapd_args_file;
  46
  47 void *
  48 slapd_daemon(
  49     void *port
  50 )
  51 {
  52         Operation               *o;
  53         BerElement              ber;
  54         unsigned long           len, tag, msgid;
  55         int                     i;
  56         int                     tcps, ns;
  57         struct sockaddr_in      addr;
  58         fd_set                  readfds;
  59         fd_set                  writefds;
  60         FILE                    *fp;
  61         int                     on = 1;
  62
  63 #ifdef HAVE_SYSCONF
  64         dtblsize = sysconf( _SC_OPEN_MAX );
  65 #elif HAVE_GETDTABLESIZE
  66         dtblsize = getdtablesize();
  67 #else
  68         dtblsize = FD_SETSIZE
  69 #endif
  70
  71 #ifdef FD_SETSIZE
  72         if(dtblsize > FD_SETSIZE) {
  73                 dtblsize = FD_SETSIZE;
  74         }
  75 #endif  /* !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_cdn = NULL;
  82                 c[i].c_addr = NULL;
  83                 c[i].c_domain = NULL;
  84                 c[i].c_ops = NULL;
  85                 c[i].c_sb.sb_sd = -1;
  86                 c[i].c_sb.sb_options = LBER_NO_READ_AHEAD;
  87                 c[i].c_sb.sb_naddr = 0;
  88                 c[i].c_sb.sb_ber.ber_buf = NULL;
  89                 c[i].c_sb.sb_ber.ber_ptr = NULL;
  90                 c[i].c_sb.sb_ber.ber_end = NULL;
  91                 c[i].c_writewaiter = 0;
  92                 c[i].c_connid = 0;
  93                 ldap_pvt_thread_mutex_init( &c[i].c_dnmutex );
  94                 ldap_pvt_thread_mutex_init( &c[i].c_opsmutex );
  95                 ldap_pvt_thread_mutex_init( &c[i].c_pdumutex );
  96                 ldap_pvt_thread_cond_init( &c[i].c_wcv );
  97         }
  98
  99         if ( (tcps = socket( AF_INET, SOCK_STREAM, 0 )) == -1 ) {
 100                 Debug( LDAP_DEBUG_ANY, "socket() failed errno %d (%s)", errno,
 101                     errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 102                     "unknown", 0 );
 103                 exit( 1 );
 104         }
 105
 106         i = 1;
 107         if ( setsockopt( tcps, SOL_SOCKET, SO_REUSEADDR, (char *) &i,
 108             sizeof(i) ) == -1 ) {
 109                 Debug( LDAP_DEBUG_ANY, "setsockopt() failed errno %d (%s)",
 110                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 111                     "unknown", 0 );
 112         }
 113
 114         (void) memset( (void *) &addr, '\0', sizeof(addr) );
 115         addr.sin_family = AF_INET;
 116         addr.sin_addr.s_addr = INADDR_ANY;
 117         addr.sin_port = htons( (int)port );
 118         if ( bind( tcps, (struct sockaddr *) &addr, sizeof(addr) ) == -1 ) {
 119                 Debug( LDAP_DEBUG_ANY, "bind() failed errno %d (%s)\n",
 120                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 121                     "unknown", 0 );
 122                 exit( 1 );
 123         }
 124
 125         if ( listen( tcps, 5 ) == -1 ) {
 126                 Debug( LDAP_DEBUG_ANY, "listen() failed errno %d (%s)",
 127                     errno, errno > -1 && errno < sys_nerr ? sys_errlist[errno] :
 128                     "unknown", 0 );
 129                 exit( 1 );
 130         }
 131
 132         (void) SIGNAL( SIGPIPE, SIG_IGN );
 133         (void) SIGNAL( LDAP_SIGUSR1, do_nothing );
 134         (void) SIGNAL( LDAP_SIGUSR2, set_shutdown );
 135         (void) SIGNAL( SIGTERM, set_shutdown );
 136         (void) SIGNAL( SIGINT, set_shutdown );
 137         (void) SIGNAL( SIGHUP, set_shutdown );
 138
 139         Debug( LDAP_DEBUG_ANY, "slapd starting\n", 0, 0, 0 );
 140
 141         if (( slapd_pid_file != NULL ) &&
 142                         (( fp = fopen( slapd_pid_file, "w" )) != NULL )) {
 143                 fprintf( fp, "%d\n", (int) getpid() );
 144                 fclose( fp );
 145         }
 146
 147         if (( slapd_args_file != NULL ) &&
 148                         (( fp = fopen( slapd_args_file, "w" )) != NULL )) {
 149                 for ( i = 0; i < g_argc; i++ ) {
 150                         fprintf( fp, "%s ", g_argv[i] );
 151                 }
 152                 fprintf( fp, "\n" );
 153                 fclose( fp );
 154         }
 155
 156         while ( !slapd_shutdown ) {
 157                 struct sockaddr_in      from;
 158                 struct hostent          *hp;
 159                 struct timeval          zero;
 160                 struct timeval          *tvp;
 161                 int                     len, pid;
 162
 163                 char    *client_name;
 164                 char    *client_addr;
 165
 166                 FD_ZERO( &writefds );
 167                 FD_ZERO( &readfds );
 168                 FD_SET( tcps, &readfds );
 169
 170                 zero.tv_sec = 0;
 171                 zero.tv_usec = 0;
 172
 173                 ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 174                 Debug( LDAP_DEBUG_CONNS,
 175                     "listening for connections on %d, activity on:",
 176                     tcps, 0, 0 );
 177
 178                 ldap_pvt_thread_mutex_lock( &new_conn_mutex );
 179                 for ( i = 0; i < dtblsize; i++ ) {
 180                         if ( c[i].c_sb.sb_sd != -1 ) {
 181                                 FD_SET( c[i].c_sb.sb_sd, &readfds );
 182
 183                                 if ( c[i].c_writewaiter ) {
 184                                         FD_SET( c[i].c_sb.sb_sd, &writefds );
 185                                 }
 186                                 Debug( LDAP_DEBUG_CONNS, " %dr%s", i,
 187                                     c[i].c_writewaiter ? "w" : "", 0 );
 188                         }
 189                 }
 190                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 191                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 192
 193                 Debug( LDAP_DEBUG_CONNS, "before select active_threads %d\n",
 194                     active_threads, 0, 0 );
 195 #if defined( HAVE_YIELDING_SELECT ) || defined( NO_THREADS )
 196                 tvp = NULL;
 197 #else
 198                 tvp = active_threads ? &zero : NULL;
 199 #endif
 200                 ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 201
 202                 switch ( i = select( dtblsize, &readfds, &writefds, 0, tvp ) ) {
 203                 case -1:        /* failure - try again */
 204                         Debug( LDAP_DEBUG_CONNS,
 205                             "select failed errno %d (%s)\n",
 206                             errno, errno > -1 && errno < sys_nerr ?
 207                             sys_errlist[errno] : "unknown", 0 );
 208                         continue;
 209
 210                 case 0:         /* timeout - let threads run */
 211                         Debug( LDAP_DEBUG_CONNS, "select timeout - yielding\n",
 212                             0, 0, 0 );
 213                         ldap_pvt_thread_yield();
 214                         continue;
 215
 216                 default:        /* something happened - deal with it */
 217                         Debug( LDAP_DEBUG_CONNS, "select activity on %d descriptors\n", i, 0, 0 );
 218                         ;       /* FALL */
 219                 }
 220                 ldap_pvt_thread_mutex_lock( &currenttime_mutex );
 221                 time( &currenttime );
 222                 ldap_pvt_thread_mutex_unlock( &currenttime_mutex );
 223
 224                 /* new connection */
 225                 ldap_pvt_thread_mutex_lock( &new_conn_mutex );
 226                 if ( FD_ISSET( tcps, &readfds ) ) {
 227                         len = sizeof(from);
 228                         if ( (ns = accept( tcps, (struct sockaddr *) &from,
 229                             &len )) == -1 ) {
 230                                 Debug( LDAP_DEBUG_ANY,
 231                                     "accept() failed errno %d (%s)", errno,
 232                                     errno > -1 && errno < sys_nerr ?
 233                                     sys_errlist[errno] : "unknown", 0 );
 234                                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 235                                 continue;
 236                         }
 237                         if ( ioctl( ns, FIONBIO, (caddr_t) &on ) == -1 ) {
 238                                 Debug( LDAP_DEBUG_ANY,
 239                                     "FIONBIO ioctl on %d failed\n", ns, 0, 0 );
 240                         }
 241
 242                         Debug( LDAP_DEBUG_CONNS, "new connection on %d\n", ns,
 243                             0, 0 );
 244
 245                         len = sizeof(from);
 246
 247                         if ( getpeername( ns, (struct sockaddr *) &from, &len )
 248                             == 0 ) {
 249                                 char *s;
 250                                 client_addr = inet_ntoa( from.sin_addr );
 251
 252 #if defined(SLAPD_RLOOKUPS) || defined(HAVE_TCPD)
 253                                 hp = gethostbyaddr( (char *)
 254                                     &(from.sin_addr.s_addr),
 255                                     sizeof(from.sin_addr.s_addr), AF_INET );
 256
 257                                 if(hp) {
 258                                         client_name = hp->h_name;
 259
 260                                         /* normalize the domain */
 261                                         for ( s = client_name; *s; s++ ) {
 262                                                 *s = TOLOWER( *s );
 263                                         }
 264
 265                                 } else {
 266                                         client_name = NULL;
 267                                 }
 268 #else
 269                                 client_name = NULL;
 270 #endif
 271
 272                         } else {
 273                                 client_name = NULL;;
 274                                 client_addr = NULL;
 275                         }
 276
 277 #ifdef HAVE_TCPD
 278                         if(!hosts_ctl("slapd",
 279                                 client_name != NULL ? client_name : STRING_UNKNOWN,
 280                                 client_addr != NULL ? client_addr : STRING_UNKNOWN,
 281                                 STRING_UNKNOWN))
 282                         {
 283                                 /* DENY ACCESS */
 284                                 Statslog( LDAP_DEBUG_ANY,
 285                                  "fd=%d connection from %s (%s) denied.\n",
 286                                         ns,
 287                                                 client_name == NULL ? "unknown" : client_name,
 288                                                 client_addr == NULL ? "unknown" : client_addr,
 289                                   0, 0 );
 290
 291                                 close(ns);
 292                                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 293                                 continue;
 294                         }
 295 #endif /* HAVE_TCPD */
 296
 297                         c[ns].c_sb.sb_sd = ns;
 298                         ldap_pvt_thread_mutex_lock( &ops_mutex );
 299                         c[ns].c_connid = num_conns++;
 300                         ldap_pvt_thread_mutex_unlock( &ops_mutex );
 301
 302                         Statslog( LDAP_DEBUG_STATS,
 303                             "conn=%d fd=%d connection from %s (%s) accepted.\n",
 304                                 c[ns].c_connid, ns,
 305                                         client_name == NULL ? "unknown" : client_name,
 306                                         client_addr == NULL ? "unknown" : client_addr,
 307                              0 );
 308
 309                         if ( c[ns].c_addr != NULL ) {
 310                                 free( c[ns].c_addr );
 311                         }
 312                         c[ns].c_addr = ch_strdup( client_addr );
 313
 314                         if ( c[ns].c_domain != NULL ) {
 315                                 free( c[ns].c_domain );
 316                         }
 317
 318                         c[ns].c_domain = ch_strdup( client_name == NULL
 319                                 ? "" : client_name );
 320
 321                         ldap_pvt_thread_mutex_lock( &c[ns].c_dnmutex );
 322                         if ( c[ns].c_dn != NULL ) {
 323                                 free( c[ns].c_dn );
 324                                 c[ns].c_dn = NULL;
 325                         }
 326                         if ( c[ns].c_cdn != NULL ) {
 327                                 free( c[ns].c_cdn );
 328                                 c[ns].c_cdn = NULL;
 329                         }
 330                         ldap_pvt_thread_mutex_unlock( &c[ns].c_dnmutex );
 331                         c[ns].c_starttime = currenttime;
 332                         c[ns].c_opsinitiated = 0;
 333                         c[ns].c_opscompleted = 0;
 334                 }
 335                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 336
 337                 Debug( LDAP_DEBUG_CONNS, "activity on:", 0, 0, 0 );
 338                 for ( i = 0; i < dtblsize; i++ ) {
 339                         int     r, w;
 340
 341                         r = FD_ISSET( i, &readfds );
 342                         w = FD_ISSET( i, &writefds );
 343                         if ( i != tcps && (r || w) ) {
 344                                 Debug( LDAP_DEBUG_CONNS, " %d%s%s", i,
 345                                     r ? "r" : "", w ? "w" : "" );
 346                         }
 347                 }
 348                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 349
 350                 for ( i = 0; i < dtblsize; i++ ) {
 351                         if ( i == tcps || (! FD_ISSET( i, &readfds ) &&
 352                             ! FD_ISSET( i, &writefds )) ) {
 353                                 continue;
 354                         }
 355
 356                         if ( FD_ISSET( i, &writefds ) ) {
 357                                 Debug( LDAP_DEBUG_CONNS,
 358                                     "signaling write waiter on %d\n", i, 0, 0 );
 359
 360                                 ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 361                                 active_threads++;
 362                                 c[i].c_writewaiter = 0;
 363                                 ldap_pvt_thread_cond_signal( &c[i].c_wcv );
 364                                 ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 365                         }
 366
 367                         if ( FD_ISSET( i, &readfds ) ) {
 368                                 Debug( LDAP_DEBUG_CONNS,
 369                                     "read activity on %d\n", i, 0, 0 );
 370
 371                                 connection_activity( &c[i] );
 372                         }
 373                 }
 374
 375                 ldap_pvt_thread_yield();
 376         }
 377
 378         Debug( LDAP_DEBUG_TRACE,
 379             "slapd shutdown: shutdown initiated.\n",
 380             0, 0, 0 );
 381
 382         close( tcps );
 383
 384         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 385         Debug( LDAP_DEBUG_ANY,
 386             "slapd shutdown: waiting for %d threads to terminate\n",
 387             active_threads, 0, 0 );
 388         while ( active_threads > 0 ) {
 389                 ldap_pvt_thread_cond_wait(&active_threads_cond, &active_threads_mutex);
 390         }
 391         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 392
 393         /* let backends do whatever cleanup they need to do */
 394         Debug( LDAP_DEBUG_TRACE,
 395             "slapd shutdown: closing each backends.\n",
 396             0, 0, 0 );
 397         be_close();
 398
 399         Debug( LDAP_DEBUG_TRACE,
 400             "slapd shutdown: shutdown backends.\n",
 401             0, 0, 0 );
 402         be_shutdown();
 403         Debug( LDAP_DEBUG_ANY, "slapd: stopped\n", 0, 0, 0 );
 404
 405         return NULL;
 406 }
 407
 408 static void
 409 set_shutdown( int sig )
 410 {
 411         Debug( LDAP_DEBUG_ANY, "slapd got shutdown signal %d\n", sig, 0, 0 );
 412         slapd_shutdown = 1;
 413         ldap_pvt_thread_kill( listener_tid, LDAP_SIGUSR1 );
 414         (void) SIGNAL( LDAP_SIGUSR2, set_shutdown );
 415         (void) SIGNAL( SIGTERM, set_shutdown );
 416         (void) SIGNAL( SIGINT, set_shutdown );
 417         (void) SIGNAL( SIGHUP, set_shutdown );
 418 }
 419
 420 static void
 421 do_nothing( int sig )
 422 {
 423         Debug( LDAP_DEBUG_TRACE, "slapd got do_nothing signal %d\n", sig, 0, 0 );
 424         (void) SIGNAL( LDAP_SIGUSR1, do_nothing );
 425 }