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                 int err = errno;
  99                 Debug( LDAP_DEBUG_ANY, "socket() failed errno %d (%s)", err,
 100                     err > -1 && err < sys_nerr ? sys_errlist[err] :
 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                 int err = errno;
 109                 Debug( LDAP_DEBUG_ANY, "setsockopt(reuse) failed errno %d (%s)",
 110                     err, err > -1 && err < sys_nerr ? sys_errlist[err] :
 111                     "unknown", 0 );
 112         }
 113
 114 #ifdef SO_KEEPALIVE
 115         i = 1;
 116         if ( setsockopt( tcps, SOL_SOCKET, SO_KEEPALIVE, (char *) &i,
 117             sizeof(i) ) == -1 ) {
 118                 int err = errno;
 119                 Debug( LDAP_DEBUG_ANY, "setsockopt(keepalive) failed errno %d (%s)",
 120                     err, err > -1 && err < sys_nerr ? sys_errlist[err] :
 121                     "unknown", 0 );
 122         }
 123 #endif
 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                 int err = errno;
 131                 Debug( LDAP_DEBUG_ANY, "bind() failed errno %d (%s)\n",
 132                     err, err > -1 && err < sys_nerr ? sys_errlist[err] :
 133                     "unknown", 0 );
 134                 exit( 1 );
 135         }
 136
 137         if ( listen( tcps, 5 ) == -1 ) {
 138                 int err = errno;
 139                 Debug( LDAP_DEBUG_ANY, "listen() failed errno %d (%s)",
 140                     err, err > -1 && err < sys_nerr ? sys_errlist[err] :
 141                     "unknown", 0 );
 142                 exit( 1 );
 143         }
 144
 145         Debug( LDAP_DEBUG_ANY, "slapd starting\n", 0, 0, 0 );
 146
 147         if (( slapd_pid_file != NULL ) &&
 148                         (( fp = fopen( slapd_pid_file, "w" )) != NULL )) {
 149                 fprintf( fp, "%d\n", (int) getpid() );
 150                 fclose( fp );
 151         }
 152
 153         if (( slapd_args_file != NULL ) &&
 154                         (( fp = fopen( slapd_args_file, "w" )) != NULL )) {
 155                 for ( i = 0; i < g_argc; i++ ) {
 156                         fprintf( fp, "%s ", g_argv[i] );
 157                 }
 158                 fprintf( fp, "\n" );
 159                 fclose( fp );
 160         }
 161
 162         while ( !slapd_shutdown ) {
 163                 struct sockaddr_in      from;
 164                 struct hostent          *hp;
 165                 struct timeval          zero;
 166                 struct timeval          *tvp;
 167                 int                     len, pid;
 168
 169                 char    *client_name;
 170                 char    *client_addr;
 171
 172                 FD_ZERO( &writefds );
 173                 FD_ZERO( &readfds );
 174                 FD_SET( tcps, &readfds );
 175
 176                 zero.tv_sec = 0;
 177                 zero.tv_usec = 0;
 178
 179                 ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 180                 Debug( LDAP_DEBUG_CONNS,
 181                     "listening for connections on %d, activity on:",
 182                     tcps, 0, 0 );
 183
 184                 ldap_pvt_thread_mutex_lock( &new_conn_mutex );
 185                 for ( i = 0; i < dtblsize; i++ ) {
 186                         if ( c[i].c_sb.sb_sd != -1 ) {
 187                                 FD_SET( c[i].c_sb.sb_sd, &readfds );
 188
 189                                 if ( c[i].c_writewaiter ) {
 190                                         FD_SET( c[i].c_sb.sb_sd, &writefds );
 191                                 }
 192                                 Debug( LDAP_DEBUG_CONNS, " %dr%s", i,
 193                                     c[i].c_writewaiter ? "w" : "", 0 );
 194                         }
 195                 }
 196                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 197                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 198
 199                 Debug( LDAP_DEBUG_CONNS, "before select active_threads %d\n",
 200                     active_threads, 0, 0 );
 201 #if defined( HAVE_YIELDING_SELECT ) || defined( NO_THREADS )
 202                 tvp = NULL;
 203 #else
 204                 tvp = active_threads ? &zero : NULL;
 205 #endif
 206                 ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 207
 208                 switch ( i = select( dtblsize, &readfds, &writefds, 0, tvp ) ) {
 209                 case -1:        { /* failure - try again */
 210                         int err = errno;
 211                         Debug( LDAP_DEBUG_CONNS,
 212                             "select failed errno %d (%s)\n",
 213                             err, err > -1 && err < sys_nerr ?
 214                             sys_errlist[err] : "unknown", 0 );
 215                         } continue;
 216
 217                 case 0:         /* timeout - let threads run */
 218                         Debug( LDAP_DEBUG_CONNS, "select timeout - yielding\n",
 219                             0, 0, 0 );
 220                         ldap_pvt_thread_yield();
 221                         continue;
 222
 223                 default:        /* something happened - deal with it */
 224                         Debug( LDAP_DEBUG_CONNS, "select activity on %d descriptors\n", i, 0, 0 );
 225                         ;       /* FALL */
 226                 }
 227                 ldap_pvt_thread_mutex_lock( &currenttime_mutex );
 228                 time( &currenttime );
 229                 ldap_pvt_thread_mutex_unlock( &currenttime_mutex );
 230
 231                 /* new connection */
 232                 ldap_pvt_thread_mutex_lock( &new_conn_mutex );
 233                 if ( FD_ISSET( tcps, &readfds ) ) {
 234                         len = sizeof(from);
 235                         if ( (ns = accept( tcps, (struct sockaddr *) &from,
 236                             &len )) == -1 )
 237                         {
 238                                 int err = errno;
 239                                 Debug( LDAP_DEBUG_ANY,
 240                                     "accept() failed errno %d (%s)", err,
 241                                     err > -1 && err < sys_nerr ?
 242                                     sys_errlist[err] : "unknown", 0 );
 243                                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 244                                 continue;
 245                         }
 246                         if ( ioctl( ns, FIONBIO, (caddr_t) &on ) == -1 ) {
 247                                 Debug( LDAP_DEBUG_ANY,
 248                                     "FIONBIO ioctl on %d failed\n", ns, 0, 0 );
 249                         }
 250
 251                         Debug( LDAP_DEBUG_CONNS, "new connection on %d\n", ns,
 252                             0, 0 );
 253
 254                         len = sizeof(from);
 255
 256                         if ( getpeername( ns, (struct sockaddr *) &from, &len )
 257                             == 0 ) {
 258                                 char *s;
 259                                 client_addr = inet_ntoa( from.sin_addr );
 260
 261 #if defined(SLAPD_RLOOKUPS) || defined(HAVE_TCPD)
 262                                 hp = gethostbyaddr( (char *)
 263                                     &(from.sin_addr.s_addr),
 264                                     sizeof(from.sin_addr.s_addr), AF_INET );
 265
 266                                 if(hp) {
 267                                         client_name = hp->h_name;
 268
 269                                         /* normalize the domain */
 270                                         for ( s = client_name; *s; s++ ) {
 271                                                 *s = TOLOWER( (unsigned char) *s );
 272                                         }
 273
 274                                 } else {
 275                                         client_name = NULL;
 276                                 }
 277 #else
 278                                 client_name = NULL;
 279 #endif
 280
 281                         } else {
 282                                 client_name = NULL;;
 283                                 client_addr = NULL;
 284                         }
 285
 286 #ifdef HAVE_TCPD
 287                         if(!hosts_ctl("slapd",
 288                                 client_name != NULL ? client_name : STRING_UNKNOWN,
 289                                 client_addr != NULL ? client_addr : STRING_UNKNOWN,
 290                                 STRING_UNKNOWN))
 291                         {
 292                                 /* DENY ACCESS */
 293                                 Statslog( LDAP_DEBUG_ANY,
 294                                  "fd=%d connection from %s (%s) denied.\n",
 295                                         ns,
 296                                                 client_name == NULL ? "unknown" : client_name,
 297                                                 client_addr == NULL ? "unknown" : client_addr,
 298                                   0, 0 );
 299
 300                                 close(ns);
 301                                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 302                                 continue;
 303                         }
 304 #endif /* HAVE_TCPD */
 305
 306                         c[ns].c_sb.sb_sd = ns;
 307                         ldap_pvt_thread_mutex_lock( &ops_mutex );
 308                         c[ns].c_connid = num_conns++;
 309                         ldap_pvt_thread_mutex_unlock( &ops_mutex );
 310
 311                         Statslog( LDAP_DEBUG_STATS,
 312                             "conn=%d fd=%d connection from %s (%s) accepted.\n",
 313                                 c[ns].c_connid, ns,
 314                                         client_name == NULL ? "unknown" : client_name,
 315                                         client_addr == NULL ? "unknown" : client_addr,
 316                              0 );
 317
 318                         if ( c[ns].c_addr != NULL ) {
 319                                 free( c[ns].c_addr );
 320                         }
 321                         c[ns].c_addr = ch_strdup( client_addr );
 322
 323                         if ( c[ns].c_domain != NULL ) {
 324                                 free( c[ns].c_domain );
 325                         }
 326
 327                         c[ns].c_domain = ch_strdup( client_name == NULL
 328                                 ? "" : client_name );
 329
 330                         ldap_pvt_thread_mutex_lock( &c[ns].c_dnmutex );
 331                         if ( c[ns].c_dn != NULL ) {
 332                                 free( c[ns].c_dn );
 333                                 c[ns].c_dn = NULL;
 334                         }
 335                         if ( c[ns].c_cdn != NULL ) {
 336                                 free( c[ns].c_cdn );
 337                                 c[ns].c_cdn = NULL;
 338                         }
 339                         ldap_pvt_thread_mutex_unlock( &c[ns].c_dnmutex );
 340                         c[ns].c_starttime = currenttime;
 341                         c[ns].c_opsinitiated = 0;
 342                         c[ns].c_opscompleted = 0;
 343                 }
 344                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 345
 346                 Debug( LDAP_DEBUG_CONNS, "activity on:", 0, 0, 0 );
 347                 for ( i = 0; i < dtblsize; i++ ) {
 348                         int     r, w;
 349
 350                         r = FD_ISSET( i, &readfds );
 351                         w = FD_ISSET( i, &writefds );
 352                         if ( i != tcps && (r || w) ) {
 353                                 Debug( LDAP_DEBUG_CONNS, " %d%s%s", i,
 354                                     r ? "r" : "", w ? "w" : "" );
 355                         }
 356                 }
 357                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 358
 359                 for ( i = 0; i < dtblsize; i++ ) {
 360                         if ( i == tcps || (! FD_ISSET( i, &readfds ) &&
 361                             ! FD_ISSET( i, &writefds )) ) {
 362                                 continue;
 363                         }
 364
 365                         if ( FD_ISSET( i, &writefds ) ) {
 366                                 Debug( LDAP_DEBUG_CONNS,
 367                                     "signaling write waiter on %d\n", i, 0, 0 );
 368
 369                                 ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 370                                 active_threads++;
 371                                 c[i].c_writewaiter = 0;
 372                                 ldap_pvt_thread_cond_signal( &c[i].c_wcv );
 373                                 ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 374                         }
 375
 376                         if ( FD_ISSET( i, &readfds ) ) {
 377                                 Debug( LDAP_DEBUG_CONNS,
 378                                     "read activity on %d\n", i, 0, 0 );
 379
 380                                 connection_activity( &c[i] );
 381                         }
 382                 }
 383
 384                 ldap_pvt_thread_yield();
 385         }
 386
 387         close( tcps );
 388
 389         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 390         Debug( LDAP_DEBUG_ANY,
 391             "slapd shutting down - 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         /* let backends do whatever cleanup they need to do */
 399         Debug( LDAP_DEBUG_TRACE,
 400             "slapd shutting down - waiting for backends to close down\n", 0, 0,
 401             0 );
 402         be_close();
 403         Debug( LDAP_DEBUG_ANY, "slapd stopping\n", 0, 0, 0 );
 404
 405         return NULL;
 406 }
 407
 408 void
 409 slap_set_shutdown( int sig )
 410 {
 411         slapd_shutdown = 1;
 412         ldap_pvt_thread_kill( listener_tid, LDAP_SIGUSR1 );
 413
 414         /* reinstall self */
 415         (void) SIGNAL( sig, slap_set_shutdown );
 416 }
 417
 418 void
 419 slap_do_nothing( int sig )
 420 {
 421         /* reinstall self */
 422         (void) SIGNAL( sig, slap_do_nothing );
 423 }