diff options
Diffstat (limited to 'src/nat/gnunet-helper-nat-server-windows.c')
-rw-r--r-- | src/nat/gnunet-helper-nat-server-windows.c | 614 |
1 files changed, 0 insertions, 614 deletions
diff --git a/src/nat/gnunet-helper-nat-server-windows.c b/src/nat/gnunet-helper-nat-server-windows.c deleted file mode 100644 index 688dde165..000000000 --- a/src/nat/gnunet-helper-nat-server-windows.c +++ /dev/null | |||
@@ -1,614 +0,0 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet. | ||
3 | Copyright (C) 2010 GNUnet e.V. | ||
4 | |||
5 | GNUnet is free software: you can redistribute it and/or modify it | ||
6 | under the terms of the GNU Affero General Public License as published | ||
7 | by the Free Software Foundation, either version 3 of the License, | ||
8 | or (at your option) any later version. | ||
9 | |||
10 | GNUnet is distributed in the hope that it will be useful, but | ||
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
13 | Affero General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU Affero General Public License | ||
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
17 | |||
18 | SPDX-License-Identifier: AGPL3.0-or-later | ||
19 | */ | ||
20 | |||
21 | /** | ||
22 | * @file src/nat/gnunet-helper-nat-server-windows.c | ||
23 | * @brief Windows tool to help bypass NATs using ICMP method | ||
24 | * This code will work under W32 only | ||
25 | * @author Christian Grothoff | ||
26 | * | ||
27 | * This program will send ONE ICMP message every 500 ms RAW sockets | ||
28 | * to a DUMMY IP address and also listens for ICMP replies. Since | ||
29 | * it uses RAW sockets, it must be run as an administrative user. | ||
30 | * In order to keep the security risk of the resulting binary | ||
31 | * minimal, the program ONLY opens the two RAW sockets with administrative | ||
32 | * privileges, then drops them and only then starts to process | ||
33 | * command line arguments. The code also does not link against | ||
34 | * any shared libraries (except libc) and is strictly minimal | ||
35 | * (except for checking for errors). The following list of people | ||
36 | * have reviewed this code and considered it safe since the last | ||
37 | * modification (if you reviewed it, please have your name added | ||
38 | * to the list): | ||
39 | * | ||
40 | * - Nathan Evans | ||
41 | * - Christian Grothoff | ||
42 | */ | ||
43 | #define _GNU_SOURCE | ||
44 | /* Instead of including gnunet_common.h */ | ||
45 | #define GNUNET_memcpy(dst, src, n) do { if (0 != n) { (void)memcpy(dst, src, n); } } while (0) | ||
46 | |||
47 | #define FD_SETSIZE 1024 | ||
48 | #include <winsock2.h> | ||
49 | #include <ws2tcpip.h> | ||
50 | #include <sys/time.h> | ||
51 | #include <sys/types.h> | ||
52 | #include <unistd.h> | ||
53 | #include <stdio.h> | ||
54 | #include <string.h> | ||
55 | #include <errno.h> | ||
56 | #include <stdlib.h> | ||
57 | #include <stdint.h> | ||
58 | #include <time.h> | ||
59 | |||
60 | /** | ||
61 | * Should we print some debug output? | ||
62 | */ | ||
63 | #define VERBOSE 0 | ||
64 | |||
65 | /** | ||
66 | * Must match IP given in the client. | ||
67 | */ | ||
68 | #define DUMMY_IP "192.0.2.86" | ||
69 | |||
70 | /** | ||
71 | * Default Port | ||
72 | */ | ||
73 | #define NAT_TRAV_PORT 22225 | ||
74 | |||
75 | /** | ||
76 | * Must match packet ID used by gnunet-helper-nat-client.c | ||
77 | */ | ||
78 | #define PACKET_ID 256 | ||
79 | |||
80 | /** | ||
81 | * TTL to use for our outgoing messages. | ||
82 | */ | ||
83 | #define IPDEFTTL 64 | ||
84 | |||
85 | #define ICMP_ECHO 8 | ||
86 | |||
87 | #define ICMP_TIME_EXCEEDED 11 | ||
88 | |||
89 | /** | ||
90 | * How often do we send our ICMP messages to receive replies? | ||
91 | */ | ||
92 | #define ICMP_SEND_FREQUENCY_MS 500 | ||
93 | |||
94 | /** | ||
95 | * IPv4 header. | ||
96 | */ | ||
97 | struct ip_header { | ||
98 | /** | ||
99 | * Version (4 bits) + Internet header length (4 bits) | ||
100 | */ | ||
101 | uint8_t vers_ihl; | ||
102 | |||
103 | /** | ||
104 | * Type of service | ||
105 | */ | ||
106 | uint8_t tos; | ||
107 | |||
108 | /** | ||
109 | * Total length | ||
110 | */ | ||
111 | uint16_t pkt_len; | ||
112 | |||
113 | /** | ||
114 | * Identification | ||
115 | */ | ||
116 | uint16_t id; | ||
117 | |||
118 | /** | ||
119 | * Flags (3 bits) + Fragment offset (13 bits) | ||
120 | */ | ||
121 | uint16_t flags_frag_offset; | ||
122 | |||
123 | /** | ||
124 | * Time to live | ||
125 | */ | ||
126 | uint8_t ttl; | ||
127 | |||
128 | /** | ||
129 | * Protocol | ||
130 | */ | ||
131 | uint8_t proto; | ||
132 | |||
133 | /** | ||
134 | * Header checksum | ||
135 | */ | ||
136 | uint16_t checksum; | ||
137 | |||
138 | /** | ||
139 | * Source address | ||
140 | */ | ||
141 | uint32_t src_ip; | ||
142 | |||
143 | /** | ||
144 | * Destination address | ||
145 | */ | ||
146 | uint32_t dst_ip; | ||
147 | }; | ||
148 | |||
149 | /** | ||
150 | * Format of ICMP packet. | ||
151 | */ | ||
152 | struct icmp_ttl_exceeded_header { | ||
153 | uint8_t type; | ||
154 | |||
155 | uint8_t code; | ||
156 | |||
157 | uint16_t checksum; | ||
158 | |||
159 | uint32_t unused; | ||
160 | |||
161 | /* followed by original payload */ | ||
162 | }; | ||
163 | |||
164 | struct icmp_echo_header { | ||
165 | uint8_t type; | ||
166 | |||
167 | uint8_t code; | ||
168 | |||
169 | uint16_t checksum; | ||
170 | |||
171 | uint32_t reserved; | ||
172 | }; | ||
173 | |||
174 | /** | ||
175 | * Beginning of UDP packet. | ||
176 | */ | ||
177 | struct udp_header { | ||
178 | uint16_t src_port; | ||
179 | |||
180 | uint16_t dst_port; | ||
181 | |||
182 | uint16_t length; | ||
183 | |||
184 | uint16_t crc; | ||
185 | }; | ||
186 | |||
187 | /** | ||
188 | * Will this binary be run in permissions testing mode? | ||
189 | */ | ||
190 | static boolean privilege_testing = FALSE; | ||
191 | |||
192 | /** | ||
193 | * Socket we use to receive "fake" ICMP replies. | ||
194 | */ | ||
195 | static _win_socket icmpsock; | ||
196 | |||
197 | /** | ||
198 | * Socket we use to send our ICMP requests. | ||
199 | */ | ||
200 | static _win_socket rawsock; | ||
201 | |||
202 | /** | ||
203 | * Socket we use to send our UDP requests. | ||
204 | */ | ||
205 | static _win_socket udpsock; | ||
206 | |||
207 | /** | ||
208 | * Target "dummy" address. | ||
209 | */ | ||
210 | static struct in_addr dummy; | ||
211 | |||
212 | |||
213 | /** | ||
214 | * CRC-16 for IP/ICMP headers. | ||
215 | * | ||
216 | * @param data what to calculate the CRC over | ||
217 | * @param bytes number of bytes in data (must be multiple of 2) | ||
218 | * @return the CRC 16. | ||
219 | */ | ||
220 | static uint16_t | ||
221 | calc_checksum(const uint16_t * data, unsigned int bytes) | ||
222 | { | ||
223 | uint32_t sum; | ||
224 | unsigned int i; | ||
225 | |||
226 | sum = 0; | ||
227 | for (i = 0; i < bytes / 2; i++) | ||
228 | sum += data[i]; | ||
229 | sum = (sum & 0xffff) + (sum >> 16); | ||
230 | sum = htons(0xffff - sum); | ||
231 | return sum; | ||
232 | } | ||
233 | |||
234 | |||
235 | /** | ||
236 | * Convert IPv4 address from text to binary form. | ||
237 | * | ||
238 | * @param af address family | ||
239 | * @param cp the address to print | ||
240 | * @param buf where to write the address result | ||
241 | * @return 1 on success | ||
242 | */ | ||
243 | static int | ||
244 | inet_pton(int af, const char *cp, struct in_addr *buf) | ||
245 | { | ||
246 | buf->s_addr = inet_addr(cp); | ||
247 | if (buf->s_addr == INADDR_NONE) | ||
248 | { | ||
249 | fprintf(stderr, "Error %d handling address %s", WSAGetLastError(), cp); | ||
250 | return 0; | ||
251 | } | ||
252 | return 1; | ||
253 | } | ||
254 | |||
255 | |||
256 | /** | ||
257 | * Send an ICMP message to the dummy IP. | ||
258 | * | ||
259 | * @param my_ip source address (our ip address) | ||
260 | */ | ||
261 | static void | ||
262 | send_icmp_echo(const struct in_addr *my_ip) | ||
263 | { | ||
264 | char packet[sizeof(struct ip_header) + sizeof(struct icmp_echo_header)]; | ||
265 | struct icmp_echo_header icmp_echo; | ||
266 | struct ip_header ip_pkt; | ||
267 | struct sockaddr_in dst; | ||
268 | size_t off; | ||
269 | int err; | ||
270 | |||
271 | off = 0; | ||
272 | ip_pkt.vers_ihl = 0x45; | ||
273 | ip_pkt.tos = 0; | ||
274 | ip_pkt.pkt_len = htons(sizeof(packet)); | ||
275 | ip_pkt.id = htons(PACKET_ID); | ||
276 | ip_pkt.flags_frag_offset = 0; | ||
277 | ip_pkt.ttl = IPDEFTTL; | ||
278 | ip_pkt.proto = IPPROTO_ICMP; | ||
279 | ip_pkt.checksum = 0; | ||
280 | ip_pkt.src_ip = my_ip->s_addr; | ||
281 | ip_pkt.dst_ip = dummy.s_addr; | ||
282 | ip_pkt.checksum = | ||
283 | htons(calc_checksum((uint16_t *)&ip_pkt, sizeof(struct ip_header))); | ||
284 | GNUNET_memcpy(&packet[off], &ip_pkt, sizeof(struct ip_header)); | ||
285 | off += sizeof(struct ip_header); | ||
286 | |||
287 | icmp_echo.type = ICMP_ECHO; | ||
288 | icmp_echo.code = 0; | ||
289 | icmp_echo.reserved = 0; | ||
290 | icmp_echo.checksum = 0; | ||
291 | icmp_echo.checksum = | ||
292 | htons(calc_checksum | ||
293 | ((uint16_t *)&icmp_echo, sizeof(struct icmp_echo_header))); | ||
294 | GNUNET_memcpy(&packet[off], &icmp_echo, sizeof(struct icmp_echo_header)); | ||
295 | off += sizeof(struct icmp_echo_header); | ||
296 | |||
297 | memset(&dst, 0, sizeof(dst)); | ||
298 | dst.sin_family = AF_INET; | ||
299 | dst.sin_addr = dummy; | ||
300 | err = | ||
301 | sendto(rawsock, packet, off, 0, (struct sockaddr *)&dst, sizeof(dst)); | ||
302 | if (err < 0) | ||
303 | { | ||
304 | #if VERBOSE | ||
305 | fprintf(stderr, "sendto failed: %s\n", strerror(errno)); | ||
306 | #endif | ||
307 | } | ||
308 | else if (err != off) | ||
309 | { | ||
310 | fprintf(stderr, "Error: partial send of ICMP message\n"); | ||
311 | } | ||
312 | } | ||
313 | |||
314 | |||
315 | /** | ||
316 | * Send a UDP message to the dummy IP. | ||
317 | */ | ||
318 | static void | ||
319 | send_udp() | ||
320 | { | ||
321 | struct sockaddr_in dst; | ||
322 | ssize_t err; | ||
323 | |||
324 | memset(&dst, 0, sizeof(dst)); | ||
325 | dst.sin_family = AF_INET; | ||
326 | dst.sin_addr = dummy; | ||
327 | dst.sin_port = htons(NAT_TRAV_PORT); | ||
328 | err = sendto(udpsock, NULL, 0, 0, (struct sockaddr *)&dst, sizeof(dst)); | ||
329 | if (err < 0) | ||
330 | { | ||
331 | #if VERBOSE | ||
332 | fprintf(stderr, "sendto failed: %s\n", strerror(errno)); | ||
333 | #endif | ||
334 | } | ||
335 | else if (0 != err) | ||
336 | { | ||
337 | fprintf(stderr, "Error: partial send of ICMP message\n"); | ||
338 | } | ||
339 | } | ||
340 | |||
341 | |||
342 | /** | ||
343 | * We've received an ICMP response. Process it. | ||
344 | */ | ||
345 | static void | ||
346 | process_icmp_response() | ||
347 | { | ||
348 | char buf[65536]; | ||
349 | ssize_t have; | ||
350 | struct in_addr source_ip; | ||
351 | struct ip_header ip_pkt; | ||
352 | struct icmp_ttl_exceeded_header icmp_ttl; | ||
353 | struct icmp_echo_header icmp_echo; | ||
354 | struct udp_header udp_pkt; | ||
355 | size_t off; | ||
356 | uint16_t port; | ||
357 | DWORD ssize; | ||
358 | |||
359 | have = read(icmpsock, buf, sizeof(buf)); | ||
360 | if (have == -1) | ||
361 | { | ||
362 | fprintf(stderr, "Error reading raw socket: %s\n", strerror(errno)); | ||
363 | return; | ||
364 | } | ||
365 | #if VERBOSE | ||
366 | fprintf(stderr, "Received message of %u bytes\n", (unsigned int)have); | ||
367 | #endif | ||
368 | if (have < | ||
369 | (ssize_t)(sizeof(struct ip_header) + | ||
370 | sizeof(struct icmp_ttl_exceeded_header) + | ||
371 | sizeof(struct ip_header))) | ||
372 | { | ||
373 | /* malformed */ | ||
374 | return; | ||
375 | } | ||
376 | off = 0; | ||
377 | GNUNET_memcpy(&ip_pkt, &buf[off], sizeof(struct ip_header)); | ||
378 | off += sizeof(struct ip_header); | ||
379 | GNUNET_memcpy(&source_ip, &ip_pkt.src_ip, sizeof(source_ip)); | ||
380 | GNUNET_memcpy(&icmp_ttl, &buf[off], sizeof(struct icmp_ttl_exceeded_header)); | ||
381 | off += sizeof(struct icmp_ttl_exceeded_header); | ||
382 | if ((ICMP_TIME_EXCEEDED != icmp_ttl.type) || (0 != icmp_ttl.code)) | ||
383 | { | ||
384 | /* different type than what we want */ | ||
385 | return; | ||
386 | } | ||
387 | /* skip 2nd IP header */ | ||
388 | GNUNET_memcpy(&ip_pkt, &buf[off], sizeof(struct ip_header)); | ||
389 | off += sizeof(struct ip_header); | ||
390 | |||
391 | switch (ip_pkt.proto) | ||
392 | { | ||
393 | case IPPROTO_ICMP: | ||
394 | if (have != | ||
395 | (sizeof(struct ip_header) * 2 + | ||
396 | sizeof(struct icmp_ttl_exceeded_header) + | ||
397 | sizeof(struct icmp_echo_header))) | ||
398 | { | ||
399 | /* malformed */ | ||
400 | return; | ||
401 | } | ||
402 | /* grab ICMP ECHO content */ | ||
403 | GNUNET_memcpy(&icmp_echo, &buf[off], sizeof(struct icmp_echo_header)); | ||
404 | port = (uint16_t)ntohl(icmp_echo.reserved); | ||
405 | break; | ||
406 | |||
407 | case IPPROTO_UDP: | ||
408 | if (have != | ||
409 | (sizeof(struct ip_header) * 2 + | ||
410 | sizeof(struct icmp_ttl_exceeded_header) + sizeof(struct udp_header))) | ||
411 | { | ||
412 | /* malformed */ | ||
413 | return; | ||
414 | } | ||
415 | /* grab UDP content */ | ||
416 | GNUNET_memcpy(&udp_pkt, &buf[off], sizeof(struct udp_header)); | ||
417 | port = ntohs(udp_pkt.length); | ||
418 | break; | ||
419 | |||
420 | default: | ||
421 | /* different type than what we want */ | ||
422 | return; | ||
423 | } | ||
424 | |||
425 | ssize = sizeof(buf); | ||
426 | WSAAddressToString((LPSOCKADDR)&source_ip, sizeof(source_ip), NULL, buf, | ||
427 | &ssize); | ||
428 | if (port == 0) | ||
429 | fprintf(stdout, "%s\n", buf); | ||
430 | else | ||
431 | fprintf(stdout, "%s:%u\n", buf, (unsigned int)port); | ||
432 | fflush(stdout); | ||
433 | } | ||
434 | |||
435 | |||
436 | /** | ||
437 | * Create an ICMP raw socket for reading. | ||
438 | * | ||
439 | * @return INVALID_SOCKET on error | ||
440 | */ | ||
441 | static _win_socket | ||
442 | make_icmp_socket() | ||
443 | { | ||
444 | _win_socket ret; | ||
445 | |||
446 | ret = _win_socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); | ||
447 | if (INVALID_SOCKET == ret) | ||
448 | { | ||
449 | fprintf(stderr, "Error opening RAW socket: %s\n", strerror(errno)); | ||
450 | return INVALID_SOCKET; | ||
451 | } | ||
452 | return ret; | ||
453 | } | ||
454 | |||
455 | |||
456 | /** | ||
457 | * Create an ICMP raw socket for writing. | ||
458 | * | ||
459 | * @return INVALID_SOCKET on error | ||
460 | */ | ||
461 | static _win_socket | ||
462 | make_raw_socket() | ||
463 | { | ||
464 | DWORD bOptVal = TRUE; | ||
465 | int bOptLen = sizeof(bOptVal); | ||
466 | |||
467 | rawsock = _win_socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); | ||
468 | if (INVALID_SOCKET == rawsock) | ||
469 | { | ||
470 | fprintf(stderr, "Error opening RAW socket: %s\n", strerror(errno)); | ||
471 | return INVALID_SOCKET; | ||
472 | } | ||
473 | |||
474 | if (0 != | ||
475 | _win_setsockopt(rawsock, SOL_SOCKET, SO_BROADCAST, (char *)&bOptVal, | ||
476 | bOptLen)) | ||
477 | { | ||
478 | fprintf(stderr, "Error setting SO_BROADCAST to ON: %s\n", | ||
479 | strerror(errno)); | ||
480 | closesocket(rawsock); | ||
481 | return INVALID_SOCKET; | ||
482 | } | ||
483 | if (0 != | ||
484 | _win_setsockopt(rawsock, IPPROTO_IP, IP_HDRINCL, (char *)&bOptVal, bOptLen)) | ||
485 | { | ||
486 | fprintf(stderr, "Error setting IP_HDRINCL to ON: %s\n", strerror(errno)); | ||
487 | closesocket(rawsock); | ||
488 | return INVALID_SOCKET; | ||
489 | } | ||
490 | return rawsock; | ||
491 | } | ||
492 | |||
493 | |||
494 | /** | ||
495 | * Create a UDP socket for writing. | ||
496 | * | ||
497 | * @param my_ip source address (our ip address) | ||
498 | * @return INVALID_SOCKET on error | ||
499 | */ | ||
500 | static _win_socket | ||
501 | make_udp_socket(const struct in_addr *my_ip) | ||
502 | { | ||
503 | _win_socket ret; | ||
504 | struct sockaddr_in addr; | ||
505 | |||
506 | ret = _win_socket(AF_INET, SOCK_DGRAM, 0); | ||
507 | if (INVALID_SOCKET == ret) | ||
508 | { | ||
509 | fprintf(stderr, "Error opening UDP socket: %s\n", strerror(errno)); | ||
510 | return INVALID_SOCKET; | ||
511 | } | ||
512 | memset(&addr, 0, sizeof(addr)); | ||
513 | addr.sin_family = AF_INET; | ||
514 | addr.sin_addr = *my_ip; | ||
515 | addr.sin_port = htons(NAT_TRAV_PORT); | ||
516 | if (0 != bind(ret, (struct sockaddr *)&addr, sizeof(addr))) | ||
517 | { | ||
518 | fprintf(stderr, "Error binding UDP socket to port %u: %s\n", NAT_TRAV_PORT, | ||
519 | strerror(errno)); | ||
520 | /* likely problematic, but not certain, try to continue */ | ||
521 | } | ||
522 | return ret; | ||
523 | } | ||
524 | |||
525 | |||
526 | int | ||
527 | main(int argc, char *const *argv) | ||
528 | { | ||
529 | struct in_addr external; | ||
530 | fd_set rs; | ||
531 | struct timeval tv; | ||
532 | WSADATA wsaData; | ||
533 | unsigned int alt = 0; | ||
534 | |||
535 | if ((argc > 1) && (0 != strcmp(argv[1], "-d"))) | ||
536 | { | ||
537 | privilege_testing = TRUE; | ||
538 | fprintf(stderr, | ||
539 | "%s", | ||
540 | "DEBUG: Running binary in privilege testing mode."); | ||
541 | argv++; | ||
542 | argc--; | ||
543 | } | ||
544 | |||
545 | if (2 != argc) | ||
546 | { | ||
547 | fprintf(stderr, | ||
548 | "This program must be started with our (internal NAT) IP as the only argument.\n"); | ||
549 | return 1; | ||
550 | } | ||
551 | if (1 != inet_pton(AF_INET, argv[1], &external)) | ||
552 | { | ||
553 | fprintf(stderr, "Error parsing IPv4 address: %s, error %s\n", argv[1], | ||
554 | strerror(errno)); | ||
555 | return 1; | ||
556 | } | ||
557 | if (1 != inet_pton(AF_INET, DUMMY_IP, &dummy)) | ||
558 | { | ||
559 | fprintf(stderr, "Internal error converting dummy IP to binary.\n"); | ||
560 | return 2; | ||
561 | } | ||
562 | if (WSAStartup(MAKEWORD(2, 1), &wsaData) != 0) | ||
563 | { | ||
564 | fprintf(stderr, "Failed to find Winsock 2.1 or better.\n"); | ||
565 | return 2; | ||
566 | } | ||
567 | if (INVALID_SOCKET == (icmpsock = make_icmp_socket())) | ||
568 | { | ||
569 | return 3; | ||
570 | } | ||
571 | if (INVALID_SOCKET == (make_raw_socket())) | ||
572 | { | ||
573 | closesocket(icmpsock); | ||
574 | return 3; | ||
575 | } | ||
576 | if (INVALID_SOCKET == (udpsock = make_udp_socket(&external))) | ||
577 | { | ||
578 | closesocket(icmpsock); | ||
579 | closesocket(rawsock); | ||
580 | return 3; | ||
581 | } | ||
582 | |||
583 | while (!privilege_testing) | ||
584 | { | ||
585 | FD_ZERO(&rs); | ||
586 | FD_SET(icmpsock, &rs); | ||
587 | tv.tv_sec = 0; | ||
588 | tv.tv_usec = ICMP_SEND_FREQUENCY_MS * 1000; | ||
589 | if (-1 == select(icmpsock + 1, &rs, NULL, NULL, &tv)) | ||
590 | { | ||
591 | if (errno == EINTR) | ||
592 | continue; | ||
593 | fprintf(stderr, "select failed: %s\n", strerror(errno)); | ||
594 | break; | ||
595 | } | ||
596 | if (FD_ISSET(icmpsock, &rs)) | ||
597 | process_icmp_response(); | ||
598 | if (0 == (++alt % 2)) | ||
599 | send_icmp_echo(&external); | ||
600 | else | ||
601 | send_udp(); | ||
602 | } | ||
603 | /* select failed (internal error or OS out of resources) */ | ||
604 | closesocket(icmpsock); | ||
605 | closesocket(rawsock); | ||
606 | closesocket(udpsock); | ||
607 | WSACleanup(); | ||
608 | if (privilege_testing) | ||
609 | return 0; | ||
610 | return 4; | ||
611 | } | ||
612 | |||
613 | |||
614 | /* end of gnunet-helper-nat-server-windows.c */ | ||