src/src/spam.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */
   6 /* License: GPL */
   7
   8 /* Code for calling spamassassin's spamd. Called from acl.c. */
   9
  10 #include "exim.h"
  11 #ifdef WITH_CONTENT_SCAN
  12 #include "spam.h"
  13
  14 uschar spam_score_buffer[16];
  15 uschar spam_score_int_buffer[16];
  16 uschar spam_bar_buffer[128];
  17 uschar spam_action_buffer[32];
  18 uschar spam_report_buffer[32600];
  19 uschar prev_user_name[128] = "";
  20 int spam_ok = 0;
  21 int spam_rc = 0;
  22 uschar *prev_spamd_address_work = NULL;
  23
  24 static const uschar * loglabel = US"spam acl condition:";
  25
  26 static int
  27 spamd_param_init(spamd_address_container *spamd)
  28 {
  29 /* default spamd server weight, time and backup value */
  30 spamd->weight = SPAMD_WEIGHT;
  31 spamd->is_failed = FALSE;
  32 spamd->is_backup = FALSE;
  33 return 0;
  34 }
  35
  36
  37 static int
  38 spamd_param(const uschar *param, spamd_address_container *spamd)
  39 {
  40 static int timesinceday = -1;
  41 uschar buffer[256];
  42
  43 /* check backup parameter */
  44 if (Ustrcmp(param, "backup") == 0)
  45   {
  46   spamd->is_backup = TRUE;
  47   return 0; /* OK */
  48   }
  49
  50 /*XXX more clever parsing could discard embedded spaces? */
  51
  52 /* check weight parameter */
  53 if (sscanf(param, "weight=%u", &spamd->weight))
  54   {
  55   if (spamd->weight == 0) /* this server disabled: skip it */
  56     return 1;
  57   return 0; /* OK */
  58   }
  59
  60 /* check time parameter */
  61 if (sscanf(param, "time=%s", buffer))
  62   {
  63   unsigned int start_h = 0, start_m = 0, start_s = 0;
  64   unsigned int end_h = 24, end_m = 0, end_s = 0;
  65   unsigned int time_start, time_end;
  66   uschar *start_string;
  67   uschar *end_string;
  68   uschar *delimiter;
  69
  70   if ((delimiter = US strchr(CS buffer, '-')))
  71     {
  72     *delimiter   = '\0';
  73     start_string = buffer;
  74     end_string   = delimiter + 1;
  75     if (sscanf(CS end_string, "%u.%u.%u", &end_h, &end_m, &end_s) == 0 ||
  76       sscanf(CS start_string, "%u.%u.%u", &start_h, &start_m, &start_s) == 0)
  77       {
  78       log_write(0, LOG_MAIN,
  79         "%s warning - invalid spamd time value: '%s'", loglabel, buffer);
  80       return -1; /* syntax error */
  81       }
  82     }
  83   else
  84     {
  85     log_write(0, LOG_MAIN,
  86     "%s warning - invalid spamd time value: '%s'", loglabel, buffer);
  87     return -1; /* syntax error */
  88     }
  89
  90   if (timesinceday < 0)
  91     {
  92     time_t now = time(NULL);
  93     struct tm *tmp = localtime(&now);
  94     timesinceday = tmp->tm_hour*3600 + tmp->tm_min*60 + tmp->tm_sec;
  95     }
  96
  97   time_start = start_h*3600 + start_m*60 + start_s;
  98   time_end = end_h*3600 + end_m*60 + end_s;
  99
 100   if (timesinceday < time_start || timesinceday >= time_end)
 101     return 1; /* skip spamd server */
 102
 103   return 0; /* OK */
 104   }
 105
 106 if (Ustrcmp(param, "variant=rspamd") == 0)
 107   {
 108   spamd->is_rspamd = TRUE;
 109   return 0;
 110   }
 111
 112 log_write(0, LOG_MAIN, "%s warning - invalid spamd parameter: '%s'",
 113   loglabel, param);
 114 return -1; /* syntax error */
 115 }
 116
 117
 118 static int
 119 spamd_get_server(spamd_address_container **spamds, int num_servers)
 120 {
 121 unsigned int i;
 122 long rnd, weights = 0;
 123 static BOOL srandomed = 0;
 124 BOOL usebackup = FALSE;
 125
 126 for (;;)
 127   {
 128   /* seedup, if we have only 1 server */
 129   if (num_servers == 1)
 130     return (spamds[0]->is_failed ? -1 : 0);
 131
 132   /* init ranmod */
 133   if (!srandomed)
 134     {
 135     struct timeval tv;
 136     gettimeofday(&tv, NULL);
 137     srandom((unsigned int)(tv.tv_usec/1000));
 138     srandomed = TRUE;
 139     }
 140
 141   /* get sum of all weights */
 142   for (i = 0; i < num_servers; i++)
 143     if (!spamds[i]->is_failed && spamds[i]->is_backup == usebackup)
 144       weights += spamds[i]->weight;
 145
 146   if (weights != 0)
 147     break;
 148   if (usebackup)        /* all servers failed (backups too) */
 149     return -1;
 150   usebackup = TRUE;
 151   }
 152
 153 rnd = random() % weights;
 154
 155 for (i = 0; i < num_servers; i++)
 156   if (!spamds[i]->is_failed && spamds[i]->is_backup == usebackup)
 157     if ((rnd -= spamds[i]->weight) < 0)
 158       return i;
 159
 160 log_write(0, LOG_MAIN|LOG_PANIC,
 161   "%s unknown error (memory/cpu corruption?)", loglabel);
 162 return -1;
 163 }
 164
 165
 166 int
 167 spam(uschar **listptr)
 168 {
 169 int sep = 0;
 170 uschar *list = *listptr;
 171 uschar *user_name;
 172 uschar user_name_buffer[128];
 173 unsigned long mbox_size;
 174 FILE *mbox_file;
 175 int spamd_sock = -1;
 176 uschar spamd_buffer[32600];
 177 int i, j, offset, result;
 178 BOOL is_rspamd;
 179 uschar spamd_version[8];
 180 uschar spamd_short_result[8];
 181 uschar spamd_score_char;
 182 double spamd_threshold, spamd_score, spamd_reject_score;
 183 int spamd_report_offset;
 184 uschar *p,*q;
 185 int override = 0;
 186 time_t start;
 187 size_t read, wrote;
 188 struct sockaddr_un server;
 189 #ifndef NO_POLL_H
 190 struct pollfd pollfd;
 191 #else                               /* Patch posted by Erik ? for OS X */
 192 struct timeval select_tv;         /* and applied by PH */
 193 fd_set select_fd;
 194 #endif
 195 uschar *spamd_address_work;
 196
 197 /* stop compiler warning */
 198 result = 0;
 199
 200 /* find the username from the option list */
 201 if ((user_name = string_nextinlist(&list, &sep,
 202                                    user_name_buffer,
 203                                    sizeof(user_name_buffer))) == NULL)
 204   {
 205   /* no username given, this means no scanning should be done */
 206   return FAIL;
 207   }
 208
 209 /* if username is "0" or "false", do not scan */
 210 if ( (Ustrcmp(user_name,"0") == 0) ||
 211      (strcmpic(user_name,US"false") == 0) )
 212   return FAIL;
 213
 214 /* if there is an additional option, check if it is "true" */
 215 if (strcmpic(list,US"true") == 0)
 216   /* in that case, always return true later */
 217   override = 1;
 218
 219 /* expand spamd_address if needed */
 220 if (*spamd_address == '$')
 221   {
 222   spamd_address_work = expand_string(spamd_address);
 223   if (spamd_address_work == NULL)
 224     {
 225     log_write(0, LOG_MAIN|LOG_PANIC,
 226       "%s spamd_address starts with $, but expansion failed: %s",
 227       loglabel, expand_string_message);
 228     return DEFER;
 229     }
 230   }
 231 else
 232   spamd_address_work = spamd_address;
 233
 234 HDEBUG(D_acl) debug_printf("spamd: addrlist '%s'\n", spamd_address_work);
 235
 236 /* check if previous spamd_address was expanded and has changed. dump cached results if so */
 237 if (  spam_ok
 238    && prev_spamd_address_work != NULL
 239    && Ustrcmp(prev_spamd_address_work, spamd_address_work) != 0
 240    )
 241   spam_ok = 0;
 242
 243 /* if we scanned for this username last time, just return */
 244 if (spam_ok && Ustrcmp(prev_user_name, user_name) == 0)
 245   return override ? OK : spam_rc;
 246
 247 /* make sure the eml mbox file is spooled up */
 248 mbox_file = spool_mbox(&mbox_size, NULL);
 249
 250 if (mbox_file == NULL)
 251   {
 252   /* error while spooling */
 253   log_write(0, LOG_MAIN|LOG_PANIC,
 254          "%s error while creating mbox spool file", loglabel);
 255   return DEFER;
 256   }
 257
 258 start = time(NULL);
 259
 260   {
 261   int num_servers = 0;
 262   int current_server;
 263   uschar *address;
 264   uschar *spamd_address_list_ptr = spamd_address_work;
 265   spamd_address_container * spamd_address_vector[32];
 266   spamd_address_container * this_spamd;
 267
 268
 269   /* Check how many spamd servers we have
 270      and register their addresses */
 271   while ((address = string_nextinlist(&spamd_address_list_ptr, &sep,
 272                                       NULL, 0)) != NULL)
 273     {
 274     uschar * sublist;
 275     int sublist_sep = -(int)' ';        /* default space-sep */
 276     unsigned args;
 277     uschar * s;
 278
 279     HDEBUG(D_acl) debug_printf("spamd: addr entry '%s'\n", address);
 280     this_spamd =
 281       (spamd_address_container *)store_get(sizeof(spamd_address_container));
 282
 283     for (sublist = address, args = 0, spamd_param_init(this_spamd);
 284          s = string_nextinlist(&sublist, &sublist_sep, NULL, 0);
 285          args++
 286          )
 287       {
 288         HDEBUG(D_acl) debug_printf("spamd: addr parm '%s'\n", s);
 289         switch (args)
 290         {
 291         case 0:   this_spamd->hostname = s;
 292                   if (*s == '/') args++;        /* local; no port */
 293                   break;
 294         case 1:   this_spamd->tcp_port = atoi(s); break;
 295         default:  spamd_param(s, this_spamd);    break;
 296         }
 297       }
 298     if (args < 2)
 299       {
 300       log_write(0, LOG_MAIN,
 301         "%s warning - invalid spamd address: '%s'", loglabel, address);
 302       continue;
 303       }
 304
 305     spamd_address_vector[num_servers] = this_spamd;
 306     if (++num_servers > 31)
 307       break;
 308     }
 309
 310   /* check if we have at least one server */
 311   if (!num_servers)
 312     {
 313     log_write(0, LOG_MAIN|LOG_PANIC,
 314        "%s no useable spamd server addresses in spamd_address configuration option.",
 315        loglabel);
 316     goto defer;
 317     }
 318
 319   while (1)
 320     {
 321     struct hostent *he;
 322     int i;
 323     BOOL is_local;
 324
 325     current_server = spamd_get_server(spamd_address_vector, num_servers);
 326     this_spamd = spamd_address_vector[current_server];
 327
 328     is_local = *this_spamd->hostname == '/';
 329
 330     debug_printf(is_local
 331                  ? "trying server %s\n" : "trying server %s, port %u\n",
 332                  this_spamd->hostname, this_spamd->tcp_port);
 333
 334     /* contact a spamd */
 335     if (is_local)
 336       {
 337       if ((spamd_sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
 338         {
 339         log_write(0, LOG_MAIN|LOG_PANIC,
 340                   "%s spamd: unable to acquire socket (%s)",
 341                   loglabel,
 342                   strerror(errno));
 343         goto defer;
 344         }
 345
 346       server.sun_family = AF_UNIX;
 347       Ustrcpy(server.sun_path, this_spamd->hostname);
 348
 349       if (connect(spamd_sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) >= 0)
 350         break;                                  /* connection OK */
 351
 352       log_write(0, LOG_MAIN,
 353                 "%s spamd: unable to connect to UNIX socket %s (%s)",
 354                 loglabel, server.sun_path, strerror(errno) );
 355       }
 356     else
 357       {
 358       if ((spamd_sock = ip_socket(SOCK_STREAM, AF_INET)) < 0)
 359         {
 360         log_write(0, LOG_MAIN|LOG_PANIC,
 361            "%s error creating IP socket for spamd", loglabel);
 362         goto defer;
 363         }
 364
 365       /*XXX should we use getaddrinfo? */
 366       if (!(he = gethostbyname(CS this_spamd->hostname)))
 367         log_write(0, LOG_MAIN|LOG_PANIC,
 368           "%s failed to lookup host '%s'", loglabel, this_spamd->hostname);
 369
 370       else
 371         {
 372         struct in_addr in = *(struct in_addr *) he->h_addr_list[0];
 373
 374         if (ip_connect(spamd_sock, AF_INET, US inet_ntoa(in),
 375                        this_spamd->tcp_port, 5) > -1)
 376           break;                                /* connection OK */
 377
 378         log_write(0, LOG_MAIN,
 379            "%s warning - spamd connection to '%s', port %u failed: %s",
 380            loglabel,
 381            this_spamd->hostname, this_spamd->tcp_port, strerror(errno));
 382         }
 383
 384       (void)close(spamd_sock);
 385
 386       this_spamd->is_failed = TRUE;
 387       current_server = spamd_get_server(spamd_address_vector, num_servers);
 388       if (current_server < 0)
 389         {
 390         log_write(0, LOG_MAIN|LOG_PANIC, "%s all spamd servers failed",
 391           loglabel);
 392         goto defer;
 393         }
 394       }
 395     }
 396     is_rspamd = this_spamd->is_rspamd;
 397   }
 398
 399 if (spamd_sock == -1)
 400   {
 401   log_write(0, LOG_MAIN|LOG_PANIC,
 402       "programming fault, spamd_sock unexpectedly unset");
 403   goto defer;
 404   }
 405
 406 (void)fcntl(spamd_sock, F_SETFL, O_NONBLOCK);
 407 /* now we are connected to spamd on spamd_sock */
 408 if (is_rspamd)
 409   {                             /* rspamd variant */
 410   uschar *req_str;
 411   const char *helo;
 412   const char *fcrdns;
 413
 414   req_str = string_sprintf("CHECK RSPAMC/1.3\r\nContent-length: %lu\r\n"
 415     "Queue-Id: %s\r\nFrom: <%s>\r\nRecipient-Number: %d\r\n", mbox_size,
 416     message_id, sender_address, recipients_count);
 417   for (i = 0; i < recipients_count; i ++)
 418     req_str = string_sprintf("%sRcpt: <%s>\r\n", req_str, recipients_list[i].address);
 419   if ((helo = expand_string(US"$sender_helo_name")) != NULL && *helo != '\0')
 420     req_str = string_sprintf("%sHelo: %s\r\n", req_str, helo);
 421   if ((fcrdns = expand_string(US"$sender_host_name")) != NULL && *fcrdns != '\0')
 422     req_str = string_sprintf("%sHostname: %s\r\n", req_str, fcrdns);
 423   if (sender_host_address != NULL)
 424     req_str = string_sprintf("%sIP: %s\r\n", req_str, sender_host_address);
 425   req_str = string_sprintf("%s\r\n", req_str);
 426   wrote = send(spamd_sock, req_str, Ustrlen(req_str), 0);
 427   }
 428   else
 429   {                             /* spamassassin variant */
 430   (void)string_format(spamd_buffer,
 431           sizeof(spamd_buffer),
 432           "REPORT SPAMC/1.2\r\nUser: %s\r\nContent-length: %ld\r\n\r\n",
 433           user_name,
 434           mbox_size);
 435   /* send our request */
 436   wrote = send(spamd_sock, spamd_buffer, Ustrlen(spamd_buffer), 0);
 437   }
 438 if (wrote == -1)
 439   {
 440   (void)close(spamd_sock);
 441   log_write(0, LOG_MAIN|LOG_PANIC,
 442        "%s spamd send failed: %s", loglabel, strerror(errno));
 443   goto defer;
 444   }
 445
 446 /* now send the file */
 447 /* spamd sometimes accepts conections but doesn't read data off
 448  * the connection.  We make the file descriptor non-blocking so
 449  * that the write will only write sufficient data without blocking
 450  * and we poll the desciptor to make sure that we can write without
 451  * blocking.  Short writes are gracefully handled and if the whole
 452  * trasaction takes too long it is aborted.
 453  * Note: poll() is not supported in OSX 10.2 and is reported to be
 454  *       broken in more recent versions (up to 10.4).
 455  */
 456 #ifndef NO_POLL_H
 457 pollfd.fd = spamd_sock;
 458 pollfd.events = POLLOUT;
 459 #endif
 460 (void)fcntl(spamd_sock, F_SETFL, O_NONBLOCK);
 461 do
 462   {
 463   read = fread(spamd_buffer,1,sizeof(spamd_buffer),mbox_file);
 464   if (read > 0)
 465     {
 466     offset = 0;
 467 again:
 468 #ifndef NO_POLL_H
 469     result = poll(&pollfd, 1, 1000);
 470
 471 /* Patch posted by Erik ? for OS X and applied by PH */
 472 #else
 473     select_tv.tv_sec = 1;
 474     select_tv.tv_usec = 0;
 475     FD_ZERO(&select_fd);
 476     FD_SET(spamd_sock, &select_fd);
 477     result = select(spamd_sock+1, NULL, &select_fd, NULL, &select_tv);
 478 #endif
 479 /* End Erik's patch */
 480
 481     if (result == -1 && errno == EINTR)
 482       goto again;
 483     else if (result < 1)
 484       {
 485       if (result == -1)
 486         log_write(0, LOG_MAIN|LOG_PANIC,
 487           "%s %s on spamd socket", loglabel, strerror(errno));
 488       else
 489         {
 490         if (time(NULL) - start < SPAMD_TIMEOUT)
 491           goto again;
 492         log_write(0, LOG_MAIN|LOG_PANIC,
 493           "%s timed out writing spamd socket", loglabel);
 494         }
 495       (void)close(spamd_sock);
 496       goto defer;
 497       }
 498
 499     wrote = send(spamd_sock,spamd_buffer + offset,read - offset,0);
 500     if (wrote == -1)
 501       {
 502       log_write(0, LOG_MAIN|LOG_PANIC,
 503           "%s %s on spamd socket", loglabel, strerror(errno));
 504       (void)close(spamd_sock);
 505       goto defer;
 506       }
 507     if (offset + wrote != read)
 508       {
 509       offset += wrote;
 510       goto again;
 511       }
 512     }
 513   }
 514 while (!feof(mbox_file) && !ferror(mbox_file));
 515
 516 if (ferror(mbox_file))
 517   {
 518   log_write(0, LOG_MAIN|LOG_PANIC,
 519     "%s error reading spool file: %s", loglabel, strerror(errno));
 520   (void)close(spamd_sock);
 521   goto defer;
 522   }
 523
 524 (void)fclose(mbox_file);
 525
 526 /* we're done sending, close socket for writing */
 527 shutdown(spamd_sock,SHUT_WR);
 528
 529 /* read spamd response using what's left of the timeout.  */
 530 memset(spamd_buffer, 0, sizeof(spamd_buffer));
 531 offset = 0;
 532 while ((i = ip_recv(spamd_sock,
 533                    spamd_buffer + offset,
 534                    sizeof(spamd_buffer) - offset - 1,
 535                    SPAMD_TIMEOUT - time(NULL) + start)) > 0 )
 536   offset += i;
 537
 538 /* error handling */
 539 if (i <= 0 && errno != 0)
 540   {
 541   log_write(0, LOG_MAIN|LOG_PANIC,
 542        "%s error reading from spamd socket: %s", loglabel, strerror(errno));
 543   (void)close(spamd_sock);
 544   return DEFER;
 545   }
 546
 547 /* reading done */
 548 (void)close(spamd_sock);
 549
 550 if (is_rspamd)
 551   {                             /* rspamd variant of reply */
 552   int r;
 553   if ((r = sscanf(CS spamd_buffer,
 554           "RSPAMD/%7s 0 EX_OK\r\nMetric: default; %7s %lf / %lf / %lf\r\n%n",
 555           spamd_version, spamd_short_result, &spamd_score, &spamd_threshold,
 556           &spamd_reject_score, &spamd_report_offset)) != 5)
 557     {
 558       log_write(0, LOG_MAIN|LOG_PANIC,
 559                 "%s cannot parse spamd output: %d", loglabel, r);
 560       return DEFER;
 561     }
 562   /* now parse action */
 563   p = &spamd_buffer[spamd_report_offset];
 564
 565   if (Ustrncmp(p, "Action: ", sizeof("Action: ") - 1) == 0)
 566     {
 567     p += sizeof("Action: ") - 1;
 568     q = &spam_action_buffer[0];
 569     while (*p && *p != '\r' && (q - spam_action_buffer) < sizeof(spam_action_buffer) - 1)
 570       *q++ = *p++;
 571     *q = '\0';
 572     }
 573   }
 574 else
 575   {                             /* spamassassin */
 576   /* dig in the spamd output and put the report in a multiline header,
 577   if requested */
 578   if (sscanf(CS spamd_buffer,
 579        "SPAMD/%7s 0 EX_OK\r\nContent-length: %*u\r\n\r\n%lf/%lf\r\n%n",
 580        spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3)
 581     {
 582       /* try to fall back to pre-2.50 spamd output */
 583       if (sscanf(CS spamd_buffer,
 584            "SPAMD/%7s 0 EX_OK\r\nSpam: %*s ; %lf / %lf\r\n\r\n%n",
 585            spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3)
 586         {
 587         log_write(0, LOG_MAIN|LOG_PANIC,
 588                   "%s cannot parse spamd output", loglabel);
 589         return DEFER;
 590         }
 591     }
 592
 593   Ustrcpy(spam_action_buffer,
 594     spamd_score >= spamd_threshold ? "reject" : "no action");
 595   }
 596
 597 /* Create report. Since this is a multiline string,
 598 we must hack it into shape first */
 599 p = &spamd_buffer[spamd_report_offset];
 600 q = spam_report_buffer;
 601 while (*p != '\0')
 602   {
 603   /* skip \r */
 604   if (*p == '\r')
 605     {
 606     p++;
 607     continue;
 608     }
 609   *q++ = *p;
 610   if (*p++ == '\n')
 611     {
 612     /* add an extra space after the newline to ensure
 613     that it is treated as a header continuation line */
 614     *q++ = ' ';
 615     }
 616   }
 617 /* NULL-terminate */
 618 *q-- = '\0';
 619 /* cut off trailing leftovers */
 620 while (*q <= ' ')
 621   *q-- = '\0';
 622
 623 spam_report = spam_report_buffer;
 624 spam_action = spam_action_buffer;
 625
 626 /* create spam bar */
 627 spamd_score_char = spamd_score > 0 ? '+' : '-';
 628 j = abs((int)(spamd_score));
 629 i = 0;
 630 if (j != 0)
 631   while ((i < j) && (i <= MAX_SPAM_BAR_CHARS))
 632      spam_bar_buffer[i++] = spamd_score_char;
 633 else
 634   {
 635   spam_bar_buffer[0] = '/';
 636   i = 1;
 637   }
 638 spam_bar_buffer[i] = '\0';
 639 spam_bar = spam_bar_buffer;
 640
 641 /* create "float" spam score */
 642 (void)string_format(spam_score_buffer, sizeof(spam_score_buffer),
 643         "%.1f", spamd_score);
 644 spam_score = spam_score_buffer;
 645
 646 /* create "int" spam score */
 647 j = (int)((spamd_score + 0.001)*10);
 648 (void)string_format(spam_score_int_buffer, sizeof(spam_score_int_buffer),
 649         "%d", j);
 650 spam_score_int = spam_score_int_buffer;
 651
 652 /* compare threshold against score */
 653 spam_rc = spamd_score >= spamd_threshold
 654   ? OK  /* spam as determined by user's threshold */
 655   : FAIL;       /* not spam */
 656
 657 /* remember expanded spamd_address if needed */
 658 if (spamd_address_work != spamd_address)
 659   prev_spamd_address_work = string_copy(spamd_address_work);
 660
 661 /* remember user name and "been here" for it */
 662 Ustrcpy(prev_user_name, user_name);
 663 spam_ok = 1;
 664
 665 return override
 666   ? OK          /* always return OK, no matter what the score */
 667   : spam_rc;
 668
 669 defer:
 670   (void)fclose(mbox_file);
 671   return DEFER;
 672 }
 673
 674 #endif