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author | Christian Grothoff <christian@grothoff.org> | 2011-07-01 08:46:27 +0000 |
---|---|---|
committer | Christian Grothoff <christian@grothoff.org> | 2011-07-01 08:46:27 +0000 |
commit | 11a2d8cd5b619a0fea63e766585c6ec4687a0707 (patch) | |
tree | 0b18ea0e567fd7bf5ca50b5994df5abe1ba77d95 /src/nat/gnunet-helper-nat-server-windows.c | |
parent | 9b986bcca579585f4f113d22b7c841a2ab28de0c (diff) | |
download | gnunet-11a2d8cd5b619a0fea63e766585c6ec4687a0707.tar.gz gnunet-11a2d8cd5b619a0fea63e766585c6ec4687a0707.zip |
renaming gnunet-nat-server/client for consistency, other minor fixes
Diffstat (limited to 'src/nat/gnunet-helper-nat-server-windows.c')
-rw-r--r-- | src/nat/gnunet-helper-nat-server-windows.c | 653 |
1 files changed, 653 insertions, 0 deletions
diff --git a/src/nat/gnunet-helper-nat-server-windows.c b/src/nat/gnunet-helper-nat-server-windows.c new file mode 100644 index 000000000..7a607c62d --- /dev/null +++ b/src/nat/gnunet-helper-nat-server-windows.c | |||
@@ -0,0 +1,653 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet. | ||
3 | (C) 2010 Christian Grothoff (and other contributing authors) | ||
4 | |||
5 | GNUnet is free software; you can redistribute it and/or modify | ||
6 | it under the terms of the GNU General Public License as published | ||
7 | by the Free Software Foundation; either version 3, or (at your | ||
8 | 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 | General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU General Public License | ||
16 | along with GNUnet; see the file COPYING. If not, write to the | ||
17 | Free Software Foundation, Inc., 59 Temple Place - Suite 330, | ||
18 | Boston, MA 02111-1307, USA. | ||
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 | |||
45 | |||
46 | #include <winsock2.h> | ||
47 | #include <ws2tcpip.h> | ||
48 | #include <sys/time.h> | ||
49 | #include <sys/types.h> | ||
50 | #include <unistd.h> | ||
51 | #include <stdio.h> | ||
52 | #include <string.h> | ||
53 | #include <errno.h> | ||
54 | #include <stdlib.h> | ||
55 | #include <stdint.h> | ||
56 | #include <time.h> | ||
57 | |||
58 | /** | ||
59 | * Should we print some debug output? | ||
60 | */ | ||
61 | #define VERBOSE 0 | ||
62 | |||
63 | /** | ||
64 | * Must match IP given in the client. | ||
65 | */ | ||
66 | #define DUMMY_IP "192.0.2.86" | ||
67 | |||
68 | /** | ||
69 | * Default Port | ||
70 | */ | ||
71 | #define NAT_TRAV_PORT 22225 | ||
72 | |||
73 | /** | ||
74 | * TTL to use for our outgoing messages. | ||
75 | */ | ||
76 | #define IPDEFTTL 64 | ||
77 | |||
78 | #define ICMP_ECHO 8 | ||
79 | |||
80 | #define ICMP_TIME_EXCEEDED 11 | ||
81 | |||
82 | /** | ||
83 | * How often do we send our ICMP messages to receive replies? | ||
84 | */ | ||
85 | #define ICMP_SEND_FREQUENCY_MS 500 | ||
86 | |||
87 | /** | ||
88 | * IPv4 header. | ||
89 | */ | ||
90 | struct ip_header | ||
91 | { | ||
92 | |||
93 | /** | ||
94 | * Version (4 bits) + Internet header length (4 bits) | ||
95 | */ | ||
96 | uint8_t vers_ihl; | ||
97 | |||
98 | /** | ||
99 | * Type of service | ||
100 | */ | ||
101 | uint8_t tos; | ||
102 | |||
103 | /** | ||
104 | * Total length | ||
105 | */ | ||
106 | uint16_t pkt_len; | ||
107 | |||
108 | /** | ||
109 | * Identification | ||
110 | */ | ||
111 | uint16_t id; | ||
112 | |||
113 | /** | ||
114 | * Flags (3 bits) + Fragment offset (13 bits) | ||
115 | */ | ||
116 | uint16_t flags_frag_offset; | ||
117 | |||
118 | /** | ||
119 | * Time to live | ||
120 | */ | ||
121 | uint8_t ttl; | ||
122 | |||
123 | /** | ||
124 | * Protocol | ||
125 | */ | ||
126 | uint8_t proto; | ||
127 | |||
128 | /** | ||
129 | * Header checksum | ||
130 | */ | ||
131 | uint16_t checksum; | ||
132 | |||
133 | /** | ||
134 | * Source address | ||
135 | */ | ||
136 | uint32_t src_ip; | ||
137 | |||
138 | /** | ||
139 | * Destination address | ||
140 | */ | ||
141 | uint32_t dst_ip; | ||
142 | }; | ||
143 | |||
144 | /** | ||
145 | * Format of ICMP packet. | ||
146 | */ | ||
147 | struct icmp_ttl_exceeded_header | ||
148 | { | ||
149 | uint8_t type; | ||
150 | |||
151 | uint8_t code; | ||
152 | |||
153 | uint16_t checksum; | ||
154 | |||
155 | uint32_t unused; | ||
156 | |||
157 | /* followed by original payload */ | ||
158 | }; | ||
159 | |||
160 | struct icmp_echo_header | ||
161 | { | ||
162 | uint8_t type; | ||
163 | |||
164 | uint8_t code; | ||
165 | |||
166 | uint16_t checksum; | ||
167 | |||
168 | uint32_t reserved; | ||
169 | }; | ||
170 | |||
171 | /** | ||
172 | * Beginning of UDP packet. | ||
173 | */ | ||
174 | struct udp_header | ||
175 | { | ||
176 | uint16_t src_port; | ||
177 | |||
178 | uint16_t dst_port; | ||
179 | |||
180 | uint16_t length; | ||
181 | |||
182 | uint16_t crc; | ||
183 | }; | ||
184 | |||
185 | /** | ||
186 | * Socket we use to receive "fake" ICMP replies. | ||
187 | */ | ||
188 | static SOCKET icmpsock; | ||
189 | |||
190 | /** | ||
191 | * Socket we use to send our ICMP requests. | ||
192 | */ | ||
193 | static SOCKET rawsock; | ||
194 | |||
195 | /** | ||
196 | * Socket we use to send our UDP requests. | ||
197 | */ | ||
198 | static SOCKET udpsock; | ||
199 | |||
200 | /** | ||
201 | * Target "dummy" address. | ||
202 | */ | ||
203 | static struct in_addr dummy; | ||
204 | |||
205 | |||
206 | /** | ||
207 | * CRC-16 for IP/ICMP headers. | ||
208 | * | ||
209 | * @param data what to calculate the CRC over | ||
210 | * @param bytes number of bytes in data (must be multiple of 2) | ||
211 | * @return the CRC 16. | ||
212 | */ | ||
213 | static uint16_t | ||
214 | calc_checksum(const uint16_t *data, | ||
215 | unsigned int bytes) | ||
216 | { | ||
217 | uint32_t sum; | ||
218 | unsigned int i; | ||
219 | |||
220 | sum = 0; | ||
221 | for (i=0;i<bytes/2;i++) | ||
222 | sum += data[i]; | ||
223 | sum = (sum & 0xffff) + (sum >> 16); | ||
224 | sum = htons(0xffff - sum); | ||
225 | return sum; | ||
226 | } | ||
227 | |||
228 | |||
229 | /** | ||
230 | * Convert IPv4 address from text to binary form. | ||
231 | * | ||
232 | * @param af address family | ||
233 | * @param cp the address to print | ||
234 | * @param buf where to write the address result | ||
235 | * @return 1 on success | ||
236 | */ | ||
237 | static int | ||
238 | inet_pton (int af, | ||
239 | const char *cp, | ||
240 | struct in_addr *buf) | ||
241 | { | ||
242 | buf->s_addr = inet_addr(cp); | ||
243 | if (buf->s_addr == INADDR_NONE) | ||
244 | { | ||
245 | fprintf(stderr, | ||
246 | "Error %d handling address %s", | ||
247 | WSAGetLastError(), | ||
248 | cp); | ||
249 | return 0; | ||
250 | } | ||
251 | return 1; | ||
252 | } | ||
253 | |||
254 | |||
255 | /** | ||
256 | * Send an ICMP message to the dummy IP. | ||
257 | * | ||
258 | * @param my_ip source address (our ip address) | ||
259 | */ | ||
260 | static void | ||
261 | send_icmp_echo (const struct in_addr *my_ip) | ||
262 | { | ||
263 | char packet[sizeof (struct ip_header) + sizeof (struct icmp_echo_header)]; | ||
264 | struct icmp_echo_header icmp_echo; | ||
265 | struct ip_header ip_pkt; | ||
266 | struct sockaddr_in dst; | ||
267 | size_t off; | ||
268 | int err; | ||
269 | |||
270 | off = 0; | ||
271 | ip_pkt.vers_ihl = 0x45; | ||
272 | ip_pkt.tos = 0; | ||
273 | ip_pkt.pkt_len = htons (sizeof (packet)); | ||
274 | ip_pkt.id = htons (256); | ||
275 | ip_pkt.flags_frag_offset = 0; | ||
276 | ip_pkt.ttl = IPDEFTTL; | ||
277 | ip_pkt.proto = IPPROTO_ICMP; | ||
278 | ip_pkt.checksum = 0; | ||
279 | ip_pkt.src_ip = my_ip->s_addr; | ||
280 | ip_pkt.dst_ip = dummy.s_addr; | ||
281 | ip_pkt.checksum = htons(calc_checksum((uint16_t*)&ip_pkt, | ||
282 | sizeof (struct ip_header))); | ||
283 | memcpy (&packet[off], | ||
284 | &ip_pkt, | ||
285 | sizeof (struct ip_header)); | ||
286 | off += sizeof (struct ip_header); | ||
287 | |||
288 | icmp_echo.type = ICMP_ECHO; | ||
289 | icmp_echo.code = 0; | ||
290 | icmp_echo.reserved = 0; | ||
291 | icmp_echo.checksum = 0; | ||
292 | icmp_echo.checksum = htons(calc_checksum((uint16_t*) &icmp_echo, | ||
293 | sizeof (struct icmp_echo_header))); | ||
294 | memcpy (&packet[off], | ||
295 | &icmp_echo, | ||
296 | sizeof (struct icmp_echo_header)); | ||
297 | off += sizeof (struct icmp_echo_header); | ||
298 | |||
299 | memset (&dst, 0, sizeof (dst)); | ||
300 | dst.sin_family = AF_INET; | ||
301 | dst.sin_addr = dummy; | ||
302 | err = sendto(rawsock, | ||
303 | packet, off, 0, | ||
304 | (struct sockaddr*)&dst, | ||
305 | sizeof(dst)); | ||
306 | if (err < 0) | ||
307 | { | ||
308 | #if VERBOSE | ||
309 | fprintf(stderr, | ||
310 | "sendto failed: %s\n", strerror(errno)); | ||
311 | #endif | ||
312 | } | ||
313 | else if (err != off) | ||
314 | { | ||
315 | fprintf(stderr, | ||
316 | "Error: partial send of ICMP message\n"); | ||
317 | } | ||
318 | } | ||
319 | |||
320 | |||
321 | /** | ||
322 | * Send a UDP message to the dummy IP. | ||
323 | */ | ||
324 | static void | ||
325 | send_udp () | ||
326 | { | ||
327 | struct sockaddr_in dst; | ||
328 | ssize_t err; | ||
329 | |||
330 | memset (&dst, 0, sizeof (dst)); | ||
331 | dst.sin_family = AF_INET; | ||
332 | dst.sin_addr = dummy; | ||
333 | dst.sin_port = htons (NAT_TRAV_PORT); | ||
334 | err = sendto(udpsock, | ||
335 | NULL, 0, 0, | ||
336 | (struct sockaddr*)&dst, | ||
337 | sizeof(dst)); | ||
338 | if (err < 0) | ||
339 | { | ||
340 | #if VERBOSE | ||
341 | fprintf(stderr, | ||
342 | "sendto failed: %s\n", strerror(errno)); | ||
343 | #endif | ||
344 | } | ||
345 | else if (0 != err) | ||
346 | { | ||
347 | fprintf(stderr, | ||
348 | "Error: partial send of ICMP message\n"); | ||
349 | } | ||
350 | } | ||
351 | |||
352 | |||
353 | /** | ||
354 | * We've received an ICMP response. Process it. | ||
355 | */ | ||
356 | static void | ||
357 | process_icmp_response () | ||
358 | { | ||
359 | char buf[65536]; | ||
360 | ssize_t have; | ||
361 | struct in_addr source_ip; | ||
362 | struct ip_header ip_pkt; | ||
363 | struct icmp_ttl_exceeded_header icmp_ttl; | ||
364 | struct icmp_echo_header icmp_echo; | ||
365 | struct udp_header udp_pkt; | ||
366 | size_t off; | ||
367 | uint16_t port; | ||
368 | DWORD ssize; | ||
369 | |||
370 | have = read (icmpsock, buf, sizeof (buf)); | ||
371 | if (have == -1) | ||
372 | { | ||
373 | fprintf (stderr, | ||
374 | "Error reading raw socket: %s\n", | ||
375 | strerror (errno)); | ||
376 | return; | ||
377 | } | ||
378 | #if VERBOSE | ||
379 | fprintf (stderr, | ||
380 | "Received message of %u bytes\n", | ||
381 | (unsigned int) have); | ||
382 | #endif | ||
383 | if (have < (ssize_t) (sizeof (struct ip_header) + sizeof (struct icmp_ttl_exceeded_header) + sizeof (struct ip_header))) | ||
384 | { | ||
385 | /* malformed */ | ||
386 | return; | ||
387 | } | ||
388 | off = 0; | ||
389 | memcpy (&ip_pkt, | ||
390 | &buf[off], | ||
391 | sizeof (struct ip_header)); | ||
392 | off += sizeof (struct ip_header); | ||
393 | memcpy(&source_ip, | ||
394 | &ip_pkt.src_ip, | ||
395 | sizeof (source_ip)); | ||
396 | memcpy (&icmp_ttl, | ||
397 | &buf[off], | ||
398 | sizeof (struct icmp_ttl_exceeded_header)); | ||
399 | off += sizeof (struct icmp_ttl_exceeded_header); | ||
400 | if ( (ICMP_TIME_EXCEEDED != icmp_ttl.type) || | ||
401 | (0 != icmp_ttl.code) ) | ||
402 | { | ||
403 | /* different type than what we want */ | ||
404 | return; | ||
405 | } | ||
406 | /* skip 2nd IP header */ | ||
407 | memcpy (&ip_pkt, | ||
408 | &buf[off], | ||
409 | sizeof (struct ip_header)); | ||
410 | off += sizeof (struct ip_header); | ||
411 | |||
412 | switch (ip_pkt.proto) | ||
413 | { | ||
414 | case IPPROTO_ICMP: | ||
415 | if (have != (sizeof (struct ip_header) * 2 + | ||
416 | sizeof (struct icmp_ttl_exceeded_header) + | ||
417 | sizeof (struct icmp_echo_header)) ) | ||
418 | { | ||
419 | /* malformed */ | ||
420 | return; | ||
421 | } | ||
422 | /* grab ICMP ECHO content */ | ||
423 | memcpy (&icmp_echo, | ||
424 | &buf[off], | ||
425 | sizeof (struct icmp_echo_header)); | ||
426 | port = (uint16_t) ntohl (icmp_echo.reserved); | ||
427 | break; | ||
428 | case IPPROTO_UDP: | ||
429 | if (have != (sizeof (struct ip_header) * 2 + | ||
430 | sizeof (struct icmp_ttl_exceeded_header) + | ||
431 | sizeof (struct udp_header)) ) | ||
432 | { | ||
433 | /* malformed */ | ||
434 | return; | ||
435 | } | ||
436 | /* grab UDP content */ | ||
437 | memcpy (&udp_pkt, | ||
438 | &buf[off], | ||
439 | sizeof (struct udp_header)); | ||
440 | port = ntohs (udp_pkt.length); | ||
441 | break; | ||
442 | default: | ||
443 | /* different type than what we want */ | ||
444 | return; | ||
445 | } | ||
446 | |||
447 | ssize = sizeof(buf); | ||
448 | WSAAddressToString((LPSOCKADDR)&source_ip, | ||
449 | sizeof(source_ip), | ||
450 | NULL, | ||
451 | buf, | ||
452 | &ssize); | ||
453 | if (port == 0) | ||
454 | fprintf (stdout, | ||
455 | "%s\n", | ||
456 | buf); | ||
457 | else | ||
458 | fprintf (stdout, | ||
459 | "%s:%u\n", | ||
460 | buf, | ||
461 | (unsigned int) port); | ||
462 | fflush (stdout); | ||
463 | } | ||
464 | |||
465 | |||
466 | /** | ||
467 | * Create an ICMP raw socket for reading. | ||
468 | * | ||
469 | * @return INVALID_SOCKET on error | ||
470 | */ | ||
471 | static SOCKET | ||
472 | make_icmp_socket () | ||
473 | { | ||
474 | SOCKET ret; | ||
475 | |||
476 | ret = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP); | ||
477 | if (INVALID_SOCKET == ret) | ||
478 | { | ||
479 | fprintf (stderr, | ||
480 | "Error opening RAW socket: %s\n", | ||
481 | strerror (errno)); | ||
482 | return INVALID_SOCKET; | ||
483 | } | ||
484 | return ret; | ||
485 | } | ||
486 | |||
487 | |||
488 | /** | ||
489 | * Create an ICMP raw socket for writing. | ||
490 | * | ||
491 | * @return INVALID_SOCKET on error | ||
492 | */ | ||
493 | static SOCKET | ||
494 | make_raw_socket () | ||
495 | { | ||
496 | DWORD bOptVal = TRUE; | ||
497 | int bOptLen = sizeof(bOptVal); | ||
498 | |||
499 | rawsock = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP); | ||
500 | if (INVALID_SOCKET == rawsock) | ||
501 | { | ||
502 | fprintf (stderr, | ||
503 | "Error opening RAW socket: %s\n", | ||
504 | strerror (errno)); | ||
505 | return INVALID_SOCKET; | ||
506 | } | ||
507 | |||
508 | if (0 != setsockopt(rawsock, | ||
509 | SOL_SOCKET, | ||
510 | SO_BROADCAST, | ||
511 | (char*)&bOptVal, bOptLen)) | ||
512 | { | ||
513 | fprintf(stderr, | ||
514 | "Error setting SO_BROADCAST to ON: %s\n", | ||
515 | strerror (errno)); | ||
516 | closesocket(rawsock); | ||
517 | return INVALID_SOCKET; | ||
518 | } | ||
519 | if (0 != setsockopt(rawsock, | ||
520 | IPPROTO_IP, | ||
521 | IP_HDRINCL, | ||
522 | (char*)&bOptVal, bOptLen)) | ||
523 | { | ||
524 | fprintf(stderr, | ||
525 | "Error setting IP_HDRINCL to ON: %s\n", | ||
526 | strerror (errno)); | ||
527 | closesocket(rawsock); | ||
528 | return INVALID_SOCKET; | ||
529 | } | ||
530 | return rawsock; | ||
531 | } | ||
532 | |||
533 | |||
534 | /** | ||
535 | * Create a UDP socket for writing. | ||
536 | * | ||
537 | * @param my_ip source address (our ip address) | ||
538 | * @return INVALID_SOCKET on error | ||
539 | */ | ||
540 | static SOCKET | ||
541 | make_udp_socket (const struct in_addr *my_ip) | ||
542 | { | ||
543 | SOCKET ret; | ||
544 | struct sockaddr_in addr; | ||
545 | |||
546 | ret = socket (AF_INET, SOCK_DGRAM, 0); | ||
547 | if (INVALID_SOCKET == ret) | ||
548 | { | ||
549 | fprintf (stderr, | ||
550 | "Error opening UDP socket: %s\n", | ||
551 | strerror (errno)); | ||
552 | return INVALID_SOCKET; | ||
553 | } | ||
554 | memset (&addr, 0, sizeof (addr)); | ||
555 | addr.sin_family = AF_INET; | ||
556 | addr.sin_addr = *my_ip; | ||
557 | addr.sin_port = htons (NAT_TRAV_PORT); | ||
558 | if (0 != bind (ret, | ||
559 | (struct sockaddr *)&addr, | ||
560 | sizeof(addr))) | ||
561 | { | ||
562 | fprintf (stderr, | ||
563 | "Error binding UDP socket to port %u: %s\n", | ||
564 | NAT_TRAV_PORT, | ||
565 | strerror (errno)); | ||
566 | /* likely problematic, but not certain, try to continue */ | ||
567 | } | ||
568 | return ret; | ||
569 | } | ||
570 | |||
571 | |||
572 | int | ||
573 | main (int argc, | ||
574 | char *const *argv) | ||
575 | { | ||
576 | struct in_addr external; | ||
577 | fd_set rs; | ||
578 | struct timeval tv; | ||
579 | WSADATA wsaData; | ||
580 | unsigned int alt; | ||
581 | |||
582 | alt = 0; | ||
583 | if (2 != argc) | ||
584 | { | ||
585 | fprintf (stderr, | ||
586 | "This program must be started with our (internal NAT) IP as the only argument.\n"); | ||
587 | return 1; | ||
588 | } | ||
589 | if (1 != inet_pton (AF_INET, argv[1], &external)) | ||
590 | { | ||
591 | fprintf (stderr, | ||
592 | "Error parsing IPv4 address: %s, error %s\n", | ||
593 | argv[1], strerror (errno)); | ||
594 | return 1; | ||
595 | } | ||
596 | if (1 != inet_pton (AF_INET, DUMMY_IP, &dummy)) | ||
597 | { | ||
598 | fprintf (stderr, | ||
599 | "Internal error converting dummy IP to binary.\n"); | ||
600 | return 2; | ||
601 | } | ||
602 | if (WSAStartup (MAKEWORD (2, 1), &wsaData) != 0) | ||
603 | { | ||
604 | fprintf (stderr, "Failed to find Winsock 2.1 or better.\n"); | ||
605 | return 2; | ||
606 | } | ||
607 | if (INVALID_SOCKET == (icmpsock = make_icmp_socket())) | ||
608 | { | ||
609 | return 3; | ||
610 | } | ||
611 | if (INVALID_SOCKET == (make_raw_socket())) | ||
612 | { | ||
613 | closesocket (icmpsock); | ||
614 | return 3; | ||
615 | } | ||
616 | if (INVALID_SOCKET == (udpsock = make_udp_socket(&external))) | ||
617 | { | ||
618 | closesocket (icmpsock); | ||
619 | closesocket (rawsock); | ||
620 | return 3; | ||
621 | } | ||
622 | while (1) | ||
623 | { | ||
624 | FD_ZERO (&rs); | ||
625 | FD_SET (icmpsock, &rs); | ||
626 | tv.tv_sec = 0; | ||
627 | tv.tv_usec = ICMP_SEND_FREQUENCY_MS * 1000; | ||
628 | if (-1 == select (icmpsock + 1, &rs, NULL, NULL, &tv)) | ||
629 | { | ||
630 | if (errno == EINTR) | ||
631 | continue; | ||
632 | fprintf (stderr, | ||
633 | "select failed: %s\n", | ||
634 | strerror (errno)); | ||
635 | break; | ||
636 | } | ||
637 | if (FD_ISSET (icmpsock, &rs)) | ||
638 | process_icmp_response (); | ||
639 | if (0 == (++alt % 2)) | ||
640 | send_icmp_echo (&external); | ||
641 | else | ||
642 | send_udp (); | ||
643 | } | ||
644 | /* select failed (internal error or OS out of resources) */ | ||
645 | closesocket(icmpsock); | ||
646 | closesocket(rawsock); | ||
647 | closesocket(udpsock); | ||
648 | WSACleanup (); | ||
649 | return 4; | ||
650 | } | ||
651 | |||
652 | |||
653 | /* end of gnunet-helper-nat-server-windows.c */ | ||