File: nmap_rpc.cc

package info (click to toggle)
nmap 6.00-0.3+deb7u1
  • links: PTS, VCS
  • area: main
  • in suites: wheezy
  • size: 55,576 kB
  • sloc: ansic: 108,190; cpp: 60,191; sh: 19,314; python: 16,531; xml: 9,428; makefile: 2,473; perl: 1,980; yacc: 608; lex: 469; asm: 372
file content (691 lines) | stat: -rw-r--r-- 27,283 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691

/***************************************************************************
 * nmap_rpc.cc -- Functions related to the RPCGrind facility of Nmap.      *
 * This includes reading the nmap-rpc services file and sending rpc        *
 * queries and interpreting responses.  The actual scan engine used for    *
 * rpc grinding is pos_scan (which is not in this file)                    *
 *                                                                         *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
 *                                                                         *
 * The Nmap Security Scanner is (C) 1996-2012 Insecure.Com LLC. Nmap is    *
 * also a registered trademark of Insecure.Com LLC.  This program is free  *
 * software; you may redistribute and/or modify it under the terms of the  *
 * GNU General Public License as published by the Free Software            *
 * Foundation; Version 2 with the clarifications and exceptions described  *
 * below.  This guarantees your right to use, modify, and redistribute     *
 * this software under certain conditions.  If you wish to embed Nmap      *
 * technology into proprietary software, we sell alternative licenses      *
 * (contact sales@insecure.com).  Dozens of software vendors already       *
 * license Nmap technology such as host discovery, port scanning, OS       *
 * detection, version detection, and the Nmap Scripting Engine.            *
 *                                                                         *
 * Note that the GPL places important restrictions on "derived works", yet *
 * it does not provide a detailed definition of that term.  To avoid       *
 * misunderstandings, we interpret that term as broadly as copyright law   *
 * allows.  For example, we consider an application to constitute a        *
 * "derivative work" for the purpose of this license if it does any of the *
 * following:                                                              *
 * o Integrates source code from Nmap                                      *
 * o Reads or includes Nmap copyrighted data files, such as                *
 *   nmap-os-db or nmap-service-probes.                                    *
 * o Executes Nmap and parses the results (as opposed to typical shell or  *
 *   execution-menu apps, which simply display raw Nmap output and so are  *
 *   not derivative works.)                                                *
 * o Integrates/includes/aggregates Nmap into a proprietary executable     *
 *   installer, such as those produced by InstallShield.                   *
 * o Links to a library or executes a program that does any of the above   *
 *                                                                         *
 * The term "Nmap" should be taken to also include any portions or derived *
 * works of Nmap, as well as other software we distribute under this       *
 * license such as Zenmap, Ncat, and Nping.  This list is not exclusive,   *
 * but is meant to clarify our interpretation of derived works with some   *
 * common examples.  Our interpretation applies only to Nmap--we don't     *
 * speak for other people's GPL works.                                     *
 *                                                                         *
 * If you have any questions about the GPL licensing restrictions on using *
 * Nmap in non-GPL works, we would be happy to help.  As mentioned above,  *
 * we also offer alternative license to integrate Nmap into proprietary    *
 * applications and appliances.  These contracts have been sold to dozens  *
 * of software vendors, and generally include a perpetual license as well  *
 * as providing for priority support and updates.  They also fund the      *
 * continued development of Nmap.  Please email sales@insecure.com for     *
 * further information.                                                    *
 *                                                                         *
 * As a special exception to the GPL terms, Insecure.Com LLC grants        *
 * permission to link the code of this program with any version of the     *
 * OpenSSL library which is distributed under a license identical to that  *
 * listed in the included docs/licenses/OpenSSL.txt file, and distribute   *
 * linked combinations including the two. You must obey the GNU GPL in all *
 * respects for all of the code used other than OpenSSL.  If you modify    *
 * this file, you may extend this exception to your version of the file,   *
 * but you are not obligated to do so.                                     *
 *                                                                         *
 * If you received these files with a written license agreement or         *
 * contract stating terms other than the terms above, then that            *
 * alternative license agreement takes precedence over these comments.     *
 *                                                                         *
 * Source is provided to this software because we believe users have a     *
 * right to know exactly what a program is going to do before they run it. *
 * This also allows you to audit the software for security holes (none     *
 * have been found so far).                                                *
 *                                                                         *
 * Source code also allows you to port Nmap to new platforms, fix bugs,    *
 * and add new features.  You are highly encouraged to send your changes   *
 * to nmap-dev@insecure.org for possible incorporation into the main       *
 * distribution.  By sending these changes to Fyodor or one of the         *
 * Insecure.Org development mailing lists, or checking them into the Nmap  *
 * source code repository, it is understood (unless you specify otherwise) *
 * that you are offering the Nmap Project (Insecure.Com LLC) the           *
 * unlimited, non-exclusive right to reuse, modify, and relicense the      *
 * code.  Nmap will always be available Open Source, but this is important *
 * because the inability to relicense code has caused devastating problems *
 * for other Free Software projects (such as KDE and NASM).  We also       *
 * occasionally relicense the code to third parties as discussed above.    *
 * If you wish to specify special license conditions of your               *
 * contributions, just say so when you send them.                          *
 *                                                                         *
 * This program is distributed in the hope that it will be useful, but     *
 * WITHOUT ANY WARRANTY; without even the implied warranty of              *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       *
 * General Public License v2.0 for more details at                         *
 * http://www.gnu.org/licenses/gpl-2.0.html , or in the COPYING file       *
 * included with Nmap.                                                     *
 *                                                                         *
 ***************************************************************************/

/* $Id: nmap_rpc.cc 28519 2012-04-29 23:43:51Z david $ */


#include "nmap_rpc.h"
#include "NmapOps.h"
#include "Target.h"
#include "charpool.h"
#include "timing.h"
#include "nmap_error.h"
#include "utils.h"
#include "nbase.h"

extern NmapOps o;
static struct rpc_info ri;
static int udp_rpc_socket = -1;
static int tcp_rpc_socket = -1;
static unsigned long rpc_xid_base = (unsigned long) -1;
					   /* The XID we send in queries is 
					   this random base number + the 
					   RPC prog number we are scanning
					   for */
static size_t tcp_readlen=0; /* used in get_rpc_results but can be reset in 
			    send_rpc_query */

static void rpc_services_init() {
  static int services_initialized = 0;
  if (services_initialized) return;
  services_initialized = 1;

  char filename[512];
  FILE *fp;
  char *tmpptr, *p;
  char line[1024];
  int lineno = 0;

  ri.num_alloc = 256;
  ri.num_used = 0;
  ri.names = (char **) cp_alloc(ri.num_alloc * sizeof(char *));
  ri.numbers = (unsigned long *) cp_alloc(ri.num_alloc * sizeof(unsigned long));

  if (nmap_fetchfile(filename, sizeof(filename), "nmap-rpc") != 1) {
    error("Unable to find nmap-rpc!  Resorting to /etc/rpc");
    strcpy(filename, "/etc/rpc");
  }

  fp = fopen(filename, "r");
  if (!fp) {
    fatal("Unable to open %s for reading rpc information", filename);
  }
  /* Record where this data file was found. */
  o.loaded_data_files["nmap-rpc"] = filename;

  while(fgets(line, sizeof(line), fp)) {
    lineno++;
    p = line;

    if (ri.num_used == ri.num_alloc) {
      tmpptr = (char *) cp_alloc(ri.num_alloc * 3 * sizeof(char *));
      memcpy(tmpptr, ri.names, ri.num_alloc * sizeof(char *));
      ri.names = (char **) tmpptr;
      tmpptr = (char *) cp_alloc(ri.num_alloc * 3 * sizeof(unsigned long));
      memcpy(tmpptr, ri.numbers, ri.num_alloc * sizeof(char *));
      ri.numbers = (unsigned long *) tmpptr;
      ri.num_alloc *= 3;
    }

    while(*p && *p != '#' && !isalnum((int) (unsigned char) *p)) p++;

    if (!*p || *p == '#') continue;

    tmpptr = strpbrk(p, " \t");
    if (!tmpptr) 
      continue;
    *tmpptr = '\0';
    
    ri.names[ri.num_used] = cp_strdup(p);
    p = tmpptr + 1;

    while(*p && !isdigit((int) (unsigned char) *p)) p++;

    if (!*p)
      continue;

    ri.numbers[ri.num_used] = strtoul(p, NULL, 10);
    ri.num_used++;
  }
  fclose(fp);
  return;
}

char *nmap_getrpcnamebynum(unsigned long num) {
  int i;

  rpc_services_init();

  for(i=0; i < ri.num_used; i++) {
    if (ri.numbers[i] == num)
      return ri.names[i];
  }
  return NULL;
}

int get_rpc_procs(unsigned long **programs, unsigned long *num_programs) {
  rpc_services_init();
  
  *programs = ri.numbers;
  *num_programs = ri.num_used;
  if (ri.num_used == 0) fatal("Unable to find any valid rpc procedures in your rpc file!  RPC scanning won't work for you");
  return 0;
}

/* Send an RPC query to the specified host/port on the specified protocol
   looking for the specified RPC program.  We cache our sending sockets
   to avoid recreating and (with TCP) reconnect()'ing them each time */
int send_rpc_query(Target *target_host, unsigned short portno,
		   int ipproto, unsigned long program, int scan_offset, 
		   int trynum) {
  static struct sockaddr_storage last_target;
  struct sockaddr_storage sock;
  size_t socklen;
  static int last_ipproto = -1;
  struct sockaddr_in *sin = NULL, *lastsin = NULL;
#ifdef HAVE_IPV6
  struct sockaddr_in6 *sin6 = NULL, *lastsin6 = NULL;
#endif
  char rpch_buf[256]; 
  struct rpc_hdr *rpch;
  int res, err = 0;

  /* static int numruns = 0;
     if (numruns++ > 2)
     fatal("Done");  */

  rpch = (struct rpc_hdr *) ((char *)rpch_buf + sizeof(u32));
  memset(rpch, 0, sizeof(struct rpc_hdr));


  while(rpc_xid_base == (unsigned long) -1)
    rpc_xid_base = (unsigned long) get_random_uint();
  
  if (o.debugging > 1) {
    log_write(LOG_PLAIN, "Sending RPC probe for program %li to %hu/%s -- scan_offset=%d trynum=%d xid=%lX\n", program, portno, proto2ascii_lowercase(ipproto), scan_offset, trynum, rpc_xid_base + ((portno & 0x3FFF) << 16) + (trynum << 30) +  scan_offset);
  }

  memset(&sock, 0, sizeof(sock));
  target_host->TargetSockAddr(&sock, &socklen);

  if (sock.ss_family == AF_INET) {
    sin = (struct sockaddr_in *) &sock;
    lastsin = (struct sockaddr_in *) &last_target;

    sin->sin_port = htons(portno);
  }
#ifdef HAVE_IPV6
  else {
    sin6 = (struct sockaddr_in6 *) &sock;
    lastsin6 = (struct sockaddr_in6 *) &last_target;

    sin6->sin6_port = htons(portno);
  }
#endif

  /* First we check whether we have to create a new connection -- we 
     need to if we have a new target_host, or a new portno, or the socket
     we want to use is -1 */
  if (ipproto == IPPROTO_TCP) {
    if ((sock.ss_family == AF_INET &&
         memcmp(sin, lastsin, sizeof(struct sockaddr_in)))
#ifdef HAVE_IPV6
     || (sock.ss_family == AF_INET6 &&
         memcmp(sin6, lastsin6, sizeof(struct sockaddr_in6)))
#endif
     || last_ipproto != IPPROTO_TCP) {
      /* New host or port -- kill our old tcp socket */
      if (tcp_rpc_socket != -1) {
        close(tcp_rpc_socket);
        tcp_rpc_socket = -1;
        tcp_readlen = 0;
      }
    }
  }
  
  last_target = sock;
  last_ipproto = ipproto;

  if (ipproto == IPPROTO_TCP && tcp_rpc_socket == -1) {
    if ((tcp_rpc_socket = socket(sock.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1)
      pfatal("Socket troubles in %s", __func__);
    /* I should unblock the socket here and timeout the connect() */
    res = connect(tcp_rpc_socket, (struct sockaddr *) &sock, socklen);
    if (res == -1) {
      if (o.debugging) {
	gh_perror("Failed to connect to port %d of %s in %s",
		  portno, target_host->targetipstr(), __func__);
      }
      close(tcp_rpc_socket);
      tcp_rpc_socket = -1;
      return -1;
    }
    unblock_socket(tcp_rpc_socket);
  } else if (ipproto == IPPROTO_UDP && udp_rpc_socket == -1) {
    if ((udp_rpc_socket = socket(sock.ss_family, SOCK_DGRAM, 0)) == -1)
      pfatal("UDP socket troubles in %s", __func__);
    unblock_socket(udp_rpc_socket);
  }
  
  /* OK, now that we have our sockets together, we form and send a
     query ... */
  rpch->type_msg = htonl(RPC_MSG_CALL); /* rpc request                 */
  rpch->version_rpc=htonl(2);           /* portmapper v.2 (hmm, and v3&&4?) */
  /*rpch->prog_proc=0;*/                    /* proc_null() rpc function     */
  /*rpch->authcred_flavor=0;*/              /* AUTH_NULL for credentials    */
  /*rpch->authcred_length=0;*/              /* length of credentials is zero*/
  /*rpch->authveri_flavor=0;*/              /* no verifiers field          */
  /*rpch->authveri_length=0;*/              /* zero length verifier field  */
  
  /* Bits are TTPPPPPPPPPPPPPP BBBBBBBBBBBBBBBB */
  /* Where T are trynum bits, P is the lowest 14 bits of the port number,
     and B is the scan[] offset */
  rpch->xid = htonl(rpc_xid_base + ((portno & 0x3FFF) << 16) + 
		    (trynum << 30) +  scan_offset); 
  rpch->prog_id = htonl(program);
  rpch->prog_ver = htonl(31337 + (rpc_xid_base & 0xFFFFF));
  
  if (ipproto == IPPROTO_UDP) {
    /* Simply send this sucker we have created ... */
    do {  
      if (o.debugging > 1)
	  nmap_hexdump((unsigned char *) rpch, sizeof(struct rpc_hdr));
      res = sendto(udp_rpc_socket, (char *)rpch, sizeof(struct rpc_hdr), 0,
		   (struct sockaddr *) &sock, socklen);
      if (res == -1)
	err = socket_errno();
     } while(res == -1 && (err == EINTR || err == ENOBUFS));


    if (res == -1) {
      if (o.debugging) {
	gh_perror("Sendto in %s", __func__);
      }
      close(udp_rpc_socket);
      udp_rpc_socket = -1;
      return -1;
    }
  } else {
    /* TCP socket */
    /* 0x80000000 means only 1 record marking */
    *(u32 *)rpch_buf = htonl(sizeof(struct rpc_hdr) | 0x80000000);
    res = Send(tcp_rpc_socket, rpch_buf, sizeof(struct rpc_hdr) + sizeof(u32), 0);
    if (res == -1) {
      if (o.debugging) {
	gh_perror("Write in %s", __func__);
      }
      close(tcp_rpc_socket);
      tcp_rpc_socket = -1;
      return -1;
    }
  }
  return 0;
}

static int rpc_are_we_done(char *msg, int msg_len, Target *target, 
		    struct portinfo *scan, struct scanstats *ss, 
		    struct portinfolist *pil, struct rpcscaninfo *rsi) {

  struct rpc_hdr_rcv *rpc_pack;
  unsigned long scan_offset;
  int trynum;
  struct portinfo *current;

  if (rsi->rpc_current_port->state == PORT_OPENFILTERED) {
    /* Received a packet, so this port is actually open */
     target->ports.setPortState(rsi->rpc_current_port->portno, 
			   rsi->rpc_current_port->proto, PORT_OPEN);
  }

  rpc_pack = (struct rpc_hdr_rcv *) msg;     
  if (msg_len < 24 || msg_len > 32 || (msg_len < 32 && rpc_pack->accept_stat == PROG_MISMATCH)) {
    /* This is not a valid reply -- we kill the port 
       (from an RPC perspective) */ 
    if (o.debugging > 1) {
      log_write(LOG_PLAIN, "Port %hu/%s labelled NON_RPC because of invalid sized message (%d)\n", 
		rsi->rpc_current_port->portno, 
		proto2ascii_uppercase(rsi->rpc_current_port->proto), msg_len);
    }
    rsi->rpc_status = RPC_STATUS_NOT_RPC;
    ss->numqueries_outstanding = 0;
    return 1;
  }

  /* Now it is time to decode the scan offset */
  scan_offset = ntohl(rpc_pack->xid);
  scan_offset -= rpc_xid_base;
  if (((scan_offset >> 16) & 0x3FFF) != (unsigned long) (rsi->rpc_current_port->portno & 0x3FFF)) {
    /* Doh -- this doesn't seem right */
    if (o.debugging > 1) {
      log_write(LOG_PLAIN, "Port %hu/%s labelled NON_RPC because ((scan_offset >> 16) & 0x3FFF) is %li\n", rsi->rpc_current_port->portno, proto2ascii_uppercase(rsi->rpc_current_port->proto), ((scan_offset >> 16) & 0x3FFF));
    }
    rsi->rpc_status = RPC_STATUS_NOT_RPC;
    ss->numqueries_outstanding = 0;
    return 1;
  }
  trynum = scan_offset >> 30;
  scan_offset &= 0xFFFF;
  if (scan_offset >= rsi->rpc_number) {
    error("Invalid scan_offset returned in RPC packet");
    rsi->rpc_status = RPC_STATUS_NOT_RPC;
    ss->numqueries_outstanding = 0;
    return 1;
  }
  if (ntohl(rpc_pack->type_msg) != RPC_MSG_REPLY) {
    error("Strange -- RPC type is %lu should be RPC_MSG_REPLY (1)", (unsigned long) ntohl(rpc_pack->type_msg));
    return 0;
  }
  if (ntohl(rpc_pack->auth_flavor) != 0 /* AUTH_NULL */ ||
      ntohl(rpc_pack->opaque_length != 0)) {
    error("Strange -- auth flavor/opaque_length are %lu/%lu should generally be 0/0",
      (unsigned long) rpc_pack->auth_flavor, (unsigned long) rpc_pack->opaque_length);
    rsi->rpc_status = RPC_STATUS_NOT_RPC;
    ss->numqueries_outstanding = 0;
    return 1;
  }

  /* OK, now that we know what this is a response to, we delete the
      appropriate entry from our scanlist */
  current = &scan[scan_offset];
   
  if (current->state != PORT_TESTING && current->state != PORT_CLOSED &&
      current->state != PORT_FILTERED) {
    error("Supposed scan_offset refers to port in state %s (should be testing, closed, or filtered)", statenum2str(current->state));
    rsi->rpc_status = RPC_STATUS_NOT_RPC;
    ss->numqueries_outstanding = 0;
    return 1;
  }
     
  if (trynum > current->trynum) {
    error("Bogus trynum %d when we are only up to %d in %s", trynum, current->trynum, __func__);
    rsi->rpc_status = RPC_STATUS_NOT_RPC;
    ss->numqueries_outstanding = 0;
    return 1;
  }

  if (current->next > -1) scan[current->next].prev = current->prev;
  if (current->prev > -1) scan[current->prev].next = current->next;
  if (current == pil->testinglist)
    pil->testinglist = (current->next >= 0)?  &scan[current->next] : NULL;
  current->next = -1;
  current->prev = -1;
     
     /* Adjust timeouts ... */
  adjust_timeouts(current->sent[trynum], &(target->to));
     
  /* If a non-zero trynum finds a port that hasn't been discovered, the
	earlier packets(s) were probably dropped.  So we decrease our 
	numqueries_ideal, otherwise we increase it slightly */
  if (trynum == 0) {
    ss->numqueries_ideal = MIN(ss->numqueries_ideal + (ss->packet_incr/ss->numqueries_ideal), ss->max_width);
  } else  {
    if (!ss->alreadydecreasedqueries) {
      ss->alreadydecreasedqueries = 1;
      ss->numqueries_ideal *= ss->fallback_percent;
      if (ss->numqueries_ideal < 1.0) ss->numqueries_ideal = 1.0;
      if (o.debugging) 
	{ 
	  log_write(LOG_STDOUT, "Lost a packet, decreasing window to %d\n", (int) ss->numqueries_ideal);
	}
    }
  }

  if (current->state == PORT_TESTING)
    ss->numqueries_outstanding--;
     
  if (ntohl(rpc_pack->accept_stat) == PROG_UNAVAIL) {
    current->state = PORT_CLOSED;
    if (o.debugging > 1) {
      error("Port %hu/%s claims that it is not RPC service %li", 
	    rsi->rpc_current_port->portno, 
	    proto2ascii_uppercase(rsi->rpc_current_port->proto),  current->portno);
    }
    rsi->valid_responses_this_port++;
    return 0;
  } else if (ntohl(rpc_pack->accept_stat) == PROG_MISMATCH) {
    if (o.debugging > 1) {
      error("Port %hu/%s claims IT IS RPC service %li", rsi->rpc_current_port->portno, proto2ascii_uppercase(rsi->rpc_current_port->proto),  current->portno);
    }
    current->state = PORT_OPEN;
    rsi->rpc_status = RPC_STATUS_GOOD_PROG;
    rsi->rpc_program = current->portno;
    rsi->rpc_lowver = ntohl(rpc_pack->low_version);
    rsi->rpc_highver = ntohl(rpc_pack->high_version);
    rsi->valid_responses_this_port++;
    ss->numqueries_outstanding = 0;
    return 1;
  } else if (ntohl(rpc_pack->accept_stat) == SUCCESS) {
    error("Umm -- RPC returned success for bogus version -- thats OK I guess");
    rsi->rpc_status = RPC_STATUS_GOOD_PROG;
    rsi->rpc_program = current->portno;
    rsi->rpc_lowver = rsi->rpc_highver = 0;
    rsi->valid_responses_this_port++;
    ss->numqueries_outstanding = 0;
    return 1;
  } else {
    fatal("Illegal rpc accept_stat");
  }
  return 0;
}

static unsigned short sockaddr_port(const struct sockaddr_storage *ss) {
  unsigned short port;

  if (ss->ss_family == AF_INET)
    port = ((struct sockaddr_in *) ss)->sin_port;
  else if (ss->ss_family == AF_INET6)
    port = ((struct sockaddr_in6 *) ss)->sin6_port;
  else
    port = 0;

  return ntohs(port);
}

void get_rpc_results(Target *target, struct portinfo *scan,
		     struct scanstats *ss, struct portinfolist *pil, 
                     struct rpcscaninfo *rsi) {
  int max_sd = -1;
  fd_set fds_r; 
  int sres;
  struct timeval tv;
  int res;
  static char readbuf[512];
  char *current_msg;
  unsigned long current_msg_len;

  if ((udp_rpc_socket == -1 && tcp_rpc_socket == -1) || ss->numqueries_outstanding <= 0)
    return;

  FD_ZERO(&fds_r);

  if (udp_rpc_socket >= 0 && rsi->rpc_current_port->proto == IPPROTO_UDP) {
    FD_SET(udp_rpc_socket, &fds_r);
    max_sd = udp_rpc_socket;
  } else if (tcp_rpc_socket >= 0 && rsi->rpc_current_port->proto == IPPROTO_TCP) {
    FD_SET(tcp_rpc_socket, &fds_r);
    max_sd = tcp_rpc_socket;
  } else {
    error("Unable to find listening socket in %s", __func__);
    return;
  }


  while (ss->numqueries_outstanding > 0) {
    /* Insure there is no timeout ... */
    gettimeofday(&tv, NULL);
    if (target->timedOut(&tv))
      return;

    tv.tv_sec = target->to.timeout / 1000000;
    tv.tv_usec = target->to.timeout % 1000000;
    sres = select(max_sd + 1, &fds_r, NULL, NULL, &tv);
    if (!sres)
      break;
    if (sres == -1 && socket_errno() == EINTR)
      continue;
    if (udp_rpc_socket >= 0 && FD_ISSET(udp_rpc_socket, &fds_r)) {
      struct sockaddr_storage from;
      recvfrom6_t fromlen = sizeof(from);
      unsigned short fromport;

      res = recvfrom(udp_rpc_socket, readbuf, sizeof(readbuf), 0, (struct sockaddr *) &from, &fromlen);

      if (res < 0) {
        /* Doh! */
        if (o.debugging || o.verbose)
          gh_perror("recvfrom in %s", __func__);
        ss->numqueries_outstanding = 0;
        rsi->rpc_status = RPC_STATUS_NOT_RPC;
        return;
      }
      fromport = sockaddr_port(&from);
      if (o.debugging > 1)
        log_write(LOG_PLAIN, "Received %d byte UDP packet\n", res);
      /* Now we check that the response is from the expected host/port */
      if (!sockaddr_storage_equal(&from, target->TargetSockAddr()) ||
          fromport != rsi->rpc_current_port->portno) {
        if (o.debugging > 1) {
          log_write(LOG_PLAIN, "Received UDP packet from %s/%hu", inet_ntop_ez(&from, fromlen), fromport);
          log_write(LOG_PLAIN, " when expecting packet from %s/%hu\n", target->targetipstr(), rsi->rpc_current_port->portno);
        }
        continue;
      }

      if (rpc_are_we_done(readbuf, res, target, scan, ss, pil, rsi) != 0) {
        return;
      }
    } else if (tcp_rpc_socket >= 0 && FD_ISSET(tcp_rpc_socket, &fds_r)) {
      do {     
        res = recv(tcp_rpc_socket, readbuf + tcp_readlen, sizeof(readbuf) - tcp_readlen, 0);
      } while(res == -1 && socket_errno() == EINTR);
      if (res <= 0) {
        if (o.debugging) {
          if (res == -1)
            gh_perror("Failed to read() from tcp rpc socket in %s", __func__);
          else {
            error("Lamer on port %u closed RPC socket on me in %s", rsi->rpc_current_port->portno, __func__);
          }
        }
        ss->numqueries_outstanding = 0;
        rsi->rpc_status = RPC_STATUS_NOT_RPC;
        return;
      }

      tcp_readlen += res;

      if (tcp_readlen < 28) {
        /* This is suspiciously small -- I'm assuming this is not the first
           part of a valid RPC packet */
        if (o.debugging > 1) {
          log_write(LOG_PLAIN, "Port %hu/%s labelled NON_RPC because tcp_readlen is %d (should be at least 28)\n", 
              rsi->rpc_current_port->portno, 
              proto2ascii_uppercase(rsi->rpc_current_port->proto), 
              (int) tcp_readlen);
        }
        ss->numqueries_outstanding = 0;
        rsi->rpc_status = RPC_STATUS_NOT_RPC;
        return;
      }
      /* I'm ignoring the multiple msg fragment possibility for now */
      current_msg_len = ntohl((*(unsigned long *)readbuf)) & 0x7FFFFFFF;

      if (current_msg_len > tcp_readlen - 4) {
        if (o.debugging > 1) {
          log_write(LOG_PLAIN, "Port %hu/%s labelled NON_RPC because current_msg_len is %li while tcp_readlen is %d\n",
              rsi->rpc_current_port->portno, 
              proto2ascii_uppercase(rsi->rpc_current_port->proto), 
              current_msg_len, (int) tcp_readlen);
        }
        ss->numqueries_outstanding = 0;
        rsi->rpc_status = RPC_STATUS_NOT_RPC;
        return;
      }
      current_msg = readbuf + 4;

      do {
        if (rpc_are_we_done(current_msg, current_msg_len, target, scan, ss, 
              pil, rsi) != 0) 
          return;

        current_msg += current_msg_len;
        if ((current_msg - readbuf) + 4UL < tcp_readlen) {       
          current_msg_len = ntohl(*(unsigned long *) current_msg) & 0x7FFFFFFF;
          current_msg += 4;
        } else {
          if ((unsigned long) (current_msg - readbuf) < tcp_readlen) {
            tcp_readlen -= current_msg - readbuf;
            memmove(readbuf, current_msg, tcp_readlen);
          } else tcp_readlen = 0;
          break;	   
        }

        if (current_msg_len < 24 || current_msg_len > 32) {
          ss->numqueries_outstanding = 0;
          if (o.debugging > 1) {
            log_write(LOG_PLAIN, "Port %hu/%s labelled NON_RPC because current_msg_len is %li\n", 
                rsi->rpc_current_port->portno, 
                proto2ascii_uppercase(rsi->rpc_current_port->proto), 
                current_msg_len);
          }
          rsi->rpc_status = RPC_STATUS_NOT_RPC;
          return;
        }

        if ((current_msg - readbuf) + current_msg_len > tcp_readlen) {
          tcp_readlen -= current_msg - readbuf;
          memmove(readbuf +4 , current_msg, tcp_readlen);
          *(unsigned long *)&readbuf = htonl(current_msg_len);
          tcp_readlen += 4;
          break;
        }
      } while(1);
    }
  }
  return;
}


void close_rpc_query_sockets() {
  if (udp_rpc_socket != -1) {
    close(udp_rpc_socket);
    udp_rpc_socket = -1;
  }

  if (tcp_rpc_socket != -1) {
    close(tcp_rpc_socket);
    tcp_rpc_socket = -1;
  }
}