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 | LBER_MAX_INCOMING_SIZE;
  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_sb.sb_max_incoming = 1 << 18;
  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                 int err = errno;
 100                 Debug( LDAP_DEBUG_ANY, "socket() failed errno %d (%s)", err,
 101                     err > -1 && err < sys_nerr ? sys_errlist[err] :
 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                 int err = errno;
 110                 Debug( LDAP_DEBUG_ANY, "setsockopt(reuse) failed errno %d (%s)",
 111                     err, err > -1 && err < sys_nerr ? sys_errlist[err] :
 112                     "unknown", 0 );
 113         }
 114
 115 #ifdef SO_KEEPALIVE
 116         i = 1;
 117         if ( setsockopt( tcps, SOL_SOCKET, SO_KEEPALIVE, (char *) &i,
 118             sizeof(i) ) == -1 ) {
 119                 int err = errno;
 120                 Debug( LDAP_DEBUG_ANY, "setsockopt(keepalive) failed errno %d (%s)",
 121                     err, err > -1 && err < sys_nerr ? sys_errlist[err] :
 122                     "unknown", 0 );
 123         }
 124 #endif
 125
 126 #ifdef TCP_NODELAY
 127         i = 1;
 128         if ( setsockopt( tcps, IPPROTO_TCP, TCP_NODELAY, (char *) &i,
 129             sizeof(i) ) == -1 ) {
 130                 int err = errno;
 131                 Debug( LDAP_DEBUG_ANY, "setsockopt(TCP_NODELAY) failed errno %d (%s)",
 132                     err, err > -1 && err < sys_nerr ? sys_errlist[err] :
 133                     "unknown", 0 );
 134         }
 135 #endif
 136
 137         (void) memset( (void *) &addr, '\0', sizeof(addr) );
 138         addr.sin_family = AF_INET;
 139         addr.sin_addr.s_addr = INADDR_ANY;
 140         addr.sin_port = htons( (int)port );
 141         if ( bind( tcps, (struct sockaddr *) &addr, sizeof(addr) ) == -1 ) {
 142                 int err = errno;
 143                 Debug( LDAP_DEBUG_ANY, "bind() failed errno %d (%s)\n",
 144                     err, err > -1 && err < sys_nerr ? sys_errlist[err] :
 145                     "unknown", 0 );
 146                 exit( 1 );
 147         }
 148
 149         if ( listen( tcps, 5 ) == -1 ) {
 150                 int err = errno;
 151                 Debug( LDAP_DEBUG_ANY, "listen() failed errno %d (%s)",
 152                     err, err > -1 && err < sys_nerr ? sys_errlist[err] :
 153                     "unknown", 0 );
 154                 exit( 1 );
 155         }
 156
 157         Debug( LDAP_DEBUG_ANY, "slapd starting\n", 0, 0, 0 );
 158
 159         if (( slapd_pid_file != NULL ) &&
 160                         (( fp = fopen( slapd_pid_file, "w" )) != NULL )) {
 161                 fprintf( fp, "%d\n", (int) getpid() );
 162                 fclose( fp );
 163         }
 164
 165         if (( slapd_args_file != NULL ) &&
 166                         (( fp = fopen( slapd_args_file, "w" )) != NULL )) {
 167                 for ( i = 0; i < g_argc; i++ ) {
 168                         fprintf( fp, "%s ", g_argv[i] );
 169                 }
 170                 fprintf( fp, "\n" );
 171                 fclose( fp );
 172         }
 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                 ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 192                 Debug( LDAP_DEBUG_CONNS,
 193                     "listening for connections on %d, activity on:",
 194                     tcps, 0, 0 );
 195
 196                 ldap_pvt_thread_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                 ldap_pvt_thread_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                 ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 219
 220                 switch ( i = select( dtblsize, &readfds, &writefds, 0, tvp ) ) {
 221                 case -1:        { /* failure - try again */
 222                         int err = errno;
 223                         Debug( LDAP_DEBUG_CONNS,
 224                             "select failed errno %d (%s)\n",
 225                             err, err > -1 && err < sys_nerr ?
 226                             sys_errlist[err] : "unknown", 0 );
 227                         } continue;
 228
 229                 case 0:         /* timeout - let threads run */
 230                         Debug( LDAP_DEBUG_CONNS, "select timeout - yielding\n",
 231                             0, 0, 0 );
 232                         ldap_pvt_thread_yield();
 233                         continue;
 234
 235                 default:        /* something happened - deal with it */
 236                         Debug( LDAP_DEBUG_CONNS, "select activity on %d descriptors\n", i, 0, 0 );
 237                         ;       /* FALL */
 238                 }
 239                 ldap_pvt_thread_mutex_lock( &currenttime_mutex );
 240                 time( &currenttime );
 241                 ldap_pvt_thread_mutex_unlock( &currenttime_mutex );
 242
 243                 /* new connection */
 244                 ldap_pvt_thread_mutex_lock( &new_conn_mutex );
 245                 if ( FD_ISSET( tcps, &readfds ) ) {
 246                         len = sizeof(from);
 247                         if ( (ns = accept( tcps, (struct sockaddr *) &from,
 248                             &len )) == -1 )
 249                         {
 250                                 int err = errno;
 251                                 Debug( LDAP_DEBUG_ANY,
 252                                     "accept() failed errno %d (%s)", err,
 253                                     err > -1 && err < sys_nerr ?
 254                                     sys_errlist[err] : "unknown", 0 );
 255                                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 256                                 continue;
 257                         }
 258                         if ( ioctl( ns, FIONBIO, (caddr_t) &on ) == -1 ) {
 259                                 Debug( LDAP_DEBUG_ANY,
 260                                     "FIONBIO ioctl on %d failed\n", ns, 0, 0 );
 261                         }
 262
 263                         Debug( LDAP_DEBUG_CONNS, "new connection on %d\n", ns,
 264                             0, 0 );
 265
 266                         len = sizeof(from);
 267
 268                         if ( getpeername( ns, (struct sockaddr *) &from, &len )
 269                             == 0 ) {
 270                                 char *s;
 271                                 client_addr = inet_ntoa( from.sin_addr );
 272
 273 #ifdef SLAPD_RLOOKUPS
 274                                 hp = gethostbyaddr( (char *)
 275                                     &(from.sin_addr),
 276                                     sizeof(from.sin_addr), AF_INET );
 277
 278                                 if(hp) {
 279                                         client_name = hp->h_name;
 280
 281                                         /* normalize the domain */
 282                                         for ( s = client_name; *s; s++ ) {
 283                                                 *s = TOLOWER( (unsigned char) *s );
 284                                         }
 285
 286                                 } else {
 287                                         client_name = NULL;
 288                                 }
 289 #else
 290                                 client_name = NULL;
 291 #endif
 292
 293                         } else {
 294                                 client_name = NULL;;
 295                                 client_addr = NULL;
 296                         }
 297
 298 #ifdef HAVE_TCPD
 299                         if(!hosts_ctl("slapd",
 300                                 client_name != NULL ? client_name : STRING_UNKNOWN,
 301                                 client_addr != NULL ? client_addr : STRING_UNKNOWN,
 302                                 STRING_UNKNOWN))
 303                         {
 304                                 /* DENY ACCESS */
 305                                 Statslog( LDAP_DEBUG_ANY,
 306                                  "fd=%d connection from %s (%s) denied.\n",
 307                                         ns,
 308                                                 client_name == NULL ? "unknown" : client_name,
 309                                                 client_addr == NULL ? "unknown" : client_addr,
 310                                   0, 0 );
 311
 312                                 close(ns);
 313                                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 314                                 continue;
 315                         }
 316 #endif /* HAVE_TCPD */
 317
 318                         c[ns].c_sb.sb_sd = ns;
 319                         ldap_pvt_thread_mutex_lock( &ops_mutex );
 320                         c[ns].c_connid = num_conns++;
 321                         ldap_pvt_thread_mutex_unlock( &ops_mutex );
 322
 323                         Statslog( LDAP_DEBUG_STATS,
 324                             "conn=%d fd=%d connection from %s (%s) accepted.\n",
 325                                 c[ns].c_connid, ns,
 326                                         client_name == NULL ? "unknown" : client_name,
 327                                         client_addr == NULL ? "unknown" : client_addr,
 328                              0 );
 329
 330                         if ( c[ns].c_addr != NULL ) {
 331                                 free( c[ns].c_addr );
 332                         }
 333
 334                         c[ns].c_addr = ch_strdup( client_addr == NULL
 335                                 ? "" : client_addr );
 336
 337                         if ( c[ns].c_domain != NULL ) {
 338                                 free( c[ns].c_domain );
 339                         }
 340
 341                         c[ns].c_domain = ch_strdup( client_name == NULL
 342                                 ? "" : client_name );
 343
 344                         ldap_pvt_thread_mutex_lock( &c[ns].c_dnmutex );
 345                         if ( c[ns].c_dn != NULL ) {
 346                                 free( c[ns].c_dn );
 347                                 c[ns].c_dn = NULL;
 348                         }
 349                         if ( c[ns].c_cdn != NULL ) {
 350                                 free( c[ns].c_cdn );
 351                                 c[ns].c_cdn = NULL;
 352                         }
 353                         ldap_pvt_thread_mutex_unlock( &c[ns].c_dnmutex );
 354                         c[ns].c_starttime = currenttime;
 355                         c[ns].c_opsinitiated = 0;
 356                         c[ns].c_opscompleted = 0;
 357                 }
 358                 ldap_pvt_thread_mutex_unlock( &new_conn_mutex );
 359
 360                 Debug( LDAP_DEBUG_CONNS, "activity on:", 0, 0, 0 );
 361                 for ( i = 0; i < dtblsize; i++ ) {
 362                         int     r, w;
 363
 364                         r = FD_ISSET( i, &readfds );
 365                         w = FD_ISSET( i, &writefds );
 366                         if ( i != tcps && (r || w) ) {
 367                                 Debug( LDAP_DEBUG_CONNS, " %d%s%s", i,
 368                                     r ? "r" : "", w ? "w" : "" );
 369                         }
 370                 }
 371                 Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
 372
 373                 for ( i = 0; i < dtblsize; i++ ) {
 374                         if ( i == tcps || (! FD_ISSET( i, &readfds ) &&
 375                             ! FD_ISSET( i, &writefds )) ) {
 376                                 continue;
 377                         }
 378
 379                         if ( FD_ISSET( i, &writefds ) ) {
 380                                 Debug( LDAP_DEBUG_CONNS,
 381                                     "signaling write waiter on %d\n", i, 0, 0 );
 382
 383                                 ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 384                                 active_threads++;
 385                                 c[i].c_writewaiter = 0;
 386                                 ldap_pvt_thread_cond_signal( &c[i].c_wcv );
 387                                 ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 388                         }
 389
 390                         if ( FD_ISSET( i, &readfds ) ) {
 391                                 Debug( LDAP_DEBUG_CONNS,
 392                                     "read activity on %d\n", i, 0, 0 );
 393
 394                                 connection_activity( &c[i] );
 395                         }
 396                 }
 397
 398                 ldap_pvt_thread_yield();
 399         }
 400
 401         close( tcps );
 402
 403         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 404         Debug( LDAP_DEBUG_ANY,
 405             "slapd shutting down - waiting for %d threads to terminate\n",
 406             active_threads, 0, 0 );
 407         while ( active_threads > 0 ) {
 408                 ldap_pvt_thread_cond_wait(&active_threads_cond, &active_threads_mutex);
 409         }
 410         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 411
 412         /* let backends do whatever cleanup they need to do */
 413         Debug( LDAP_DEBUG_TRACE,
 414             "slapd shutting down - waiting for backends to close down\n", 0, 0,
 415             0 );
 416         be_close();
 417         Debug( LDAP_DEBUG_ANY, "slapd stopping\n", 0, 0, 0 );
 418
 419         return NULL;
 420 }
 421
 422 void
 423 slap_set_shutdown( int sig )
 424 {
 425         slapd_shutdown = 1;
 426         ldap_pvt_thread_kill( listener_tid, LDAP_SIGUSR1 );
 427
 428         /* reinstall self */
 429         (void) SIGNAL( sig, slap_set_shutdown );
 430 }
 431
 432 void
 433 slap_do_nothing( int sig )
 434 {
 435         /* reinstall self */
 436         (void) SIGNAL( sig, slap_do_nothing );
 437 }