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-rw-r--r--src/gns/gnunet-gns-proxy.c3909
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diff --git a/src/gns/gnunet-gns-proxy.c b/src/gns/gnunet-gns-proxy.c
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1/*
2 This file is part of GNUnet.
3 Copyright (C) 2012-2018 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 * @author Martin Schanzenbach
22 * @author Christian Grothoff
23 * @file src/gns/gnunet-gns-proxy.c
24 * @brief HTTP(S) proxy that rewrites URIs and fakes certificates to make GNS work
25 * with legacy browsers
26 *
27 * TODO:
28 * - double-check queueing logic
29 */
30#include "platform.h"
31#include <microhttpd.h>
32/* Just included for the right curl.h */
33#include "gnunet_curl_lib.h"
34#include <gnutls/gnutls.h>
35#include <gnutls/x509.h>
36#include <gnutls/abstract.h>
37#include <gnutls/crypto.h>
38#if HAVE_GNUTLS_DANE
39#include <gnutls/dane.h>
40#endif
41#include <regex.h>
42#include "gnunet_util_lib.h"
43#include "gnunet_gns_service.h"
44#include "gnunet_identity_service.h"
45#include "gns.h"
46#include "gnunet_mhd_compat.h"
47
48/**
49 * Default Socks5 listen port.
50 */
51#define GNUNET_GNS_PROXY_PORT 7777
52
53/**
54 * Maximum supported length for a URI.
55 * Should die. @deprecated
56 */
57#define MAX_HTTP_URI_LENGTH 2048
58
59/**
60 * Maximum number of DANE records we support
61 * per domain name (and port and protocol).
62 */
63#define MAX_DANES 32
64
65/**
66 * Size of the buffer for the data upload / download. Must be
67 * enough for curl, thus CURL_MAX_WRITE_SIZE is needed here (16k).
68 */
69#define IO_BUFFERSIZE CURL_MAX_WRITE_SIZE
70
71/**
72 * Size of the read/write buffers for Socks. Uses
73 * 256 bytes for the hostname (at most), plus a few
74 * bytes overhead for the messages.
75 */
76#define SOCKS_BUFFERSIZE (256 + 32)
77
78/**
79 * Port for plaintext HTTP.
80 */
81#define HTTP_PORT 80
82
83/**
84 * Port for HTTPS.
85 */
86#define HTTPS_PORT 443
87
88/**
89 * Largest allowed size for a PEM certificate.
90 */
91#define MAX_PEM_SIZE (10 * 1024)
92
93/**
94 * After how long do we clean up unused MHD TLS instances?
95 */
96#define MHD_CACHE_TIMEOUT GNUNET_TIME_relative_multiply ( \
97 GNUNET_TIME_UNIT_MINUTES, 5)
98
99/**
100 * After how long do we clean up Socks5 handles that failed to show any activity
101 * with their respective MHD instance?
102 */
103#define HTTP_HANDSHAKE_TIMEOUT GNUNET_TIME_relative_multiply ( \
104 GNUNET_TIME_UNIT_SECONDS, 15)
105
106
107/**
108 * Log curl error.
109 *
110 * @param level log level
111 * @param fun name of curl_easy-function that gave the error
112 * @param rc return code from curl
113 */
114#define LOG_CURL_EASY(level, fun, rc) \
115 GNUNET_log (level, \
116 _ ("%s failed at %s:%d: `%s'\n"), \
117 fun, \
118 __FILE__, \
119 __LINE__, \
120 curl_easy_strerror (rc))
121
122
123/* *************** Socks protocol definitions (move to TUN?) ****************** */
124
125/**
126 * Which SOCKS version do we speak?
127 */
128#define SOCKS_VERSION_5 0x05
129
130/**
131 * Flag to set for 'no authentication'.
132 */
133#define SOCKS_AUTH_NONE 0
134
135
136/**
137 * Commands in Socks5.
138 */
139enum Socks5Commands
140{
141 /**
142 * Establish TCP/IP stream.
143 */
144 SOCKS5_CMD_TCP_STREAM = 1,
145
146 /**
147 * Establish TCP port binding.
148 */
149 SOCKS5_CMD_TCP_PORT = 2,
150
151 /**
152 * Establish UDP port binding.
153 */
154 SOCKS5_CMD_UDP_PORT = 3
155};
156
157
158/**
159 * Address types in Socks5.
160 */
161enum Socks5AddressType
162{
163 /**
164 * IPv4 address.
165 */
166 SOCKS5_AT_IPV4 = 1,
167
168 /**
169 * IPv4 address.
170 */
171 SOCKS5_AT_DOMAINNAME = 3,
172
173 /**
174 * IPv6 address.
175 */
176 SOCKS5_AT_IPV6 = 4
177};
178
179
180/**
181 * Status codes in Socks5 response.
182 */
183enum Socks5StatusCode
184{
185 SOCKS5_STATUS_REQUEST_GRANTED = 0,
186 SOCKS5_STATUS_GENERAL_FAILURE = 1,
187 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE = 2,
188 SOCKS5_STATUS_NETWORK_UNREACHABLE = 3,
189 SOCKS5_STATUS_HOST_UNREACHABLE = 4,
190 SOCKS5_STATUS_CONNECTION_REFUSED_BY_HOST = 5,
191 SOCKS5_STATUS_TTL_EXPIRED = 6,
192 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED = 7,
193 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED = 8
194};
195
196
197/**
198 * Client hello in Socks5 protocol.
199 */
200struct Socks5ClientHelloMessage
201{
202 /**
203 * Should be #SOCKS_VERSION_5.
204 */
205 uint8_t version;
206
207 /**
208 * How many authentication methods does the client support.
209 */
210 uint8_t num_auth_methods;
211
212 /* followed by supported authentication methods, 1 byte per method */
213};
214
215
216/**
217 * Server hello in Socks5 protocol.
218 */
219struct Socks5ServerHelloMessage
220{
221 /**
222 * Should be #SOCKS_VERSION_5.
223 */
224 uint8_t version;
225
226 /**
227 * Chosen authentication method, for us always #SOCKS_AUTH_NONE,
228 * which skips the authentication step.
229 */
230 uint8_t auth_method;
231};
232
233
234/**
235 * Client socks request in Socks5 protocol.
236 */
237struct Socks5ClientRequestMessage
238{
239 /**
240 * Should be #SOCKS_VERSION_5.
241 */
242 uint8_t version;
243
244 /**
245 * Command code, we only uspport #SOCKS5_CMD_TCP_STREAM.
246 */
247 uint8_t command;
248
249 /**
250 * Reserved, always zero.
251 */
252 uint8_t resvd;
253
254 /**
255 * Address type, an `enum Socks5AddressType`.
256 */
257 uint8_t addr_type;
258
259 /*
260 * Followed by either an ip4/ipv6 address or a domain name with a
261 * length field (uint8_t) in front (depending on @e addr_type).
262 * followed by port number in network byte order (uint16_t).
263 */
264};
265
266
267/**
268 * Server response to client requests in Socks5 protocol.
269 */
270struct Socks5ServerResponseMessage
271{
272 /**
273 * Should be #SOCKS_VERSION_5.
274 */
275 uint8_t version;
276
277 /**
278 * Status code, an `enum Socks5StatusCode`
279 */
280 uint8_t reply;
281
282 /**
283 * Always zero.
284 */
285 uint8_t reserved;
286
287 /**
288 * Address type, an `enum Socks5AddressType`.
289 */
290 uint8_t addr_type;
291
292 /*
293 * Followed by either an ip4/ipv6 address or a domain name with a
294 * length field (uint8_t) in front (depending on @e addr_type).
295 * followed by port number in network byte order (uint16_t).
296 */
297};
298
299
300/* *********************** Datastructures for HTTP handling ****************** */
301
302/**
303 * A structure for CA cert/key
304 */
305struct ProxyCA
306{
307 /**
308 * The certificate
309 */
310 gnutls_x509_crt_t cert;
311
312 /**
313 * The private key
314 */
315 gnutls_x509_privkey_t key;
316};
317
318
319/**
320 * Structure for GNS certificates
321 */
322struct ProxyGNSCertificate
323{
324 /**
325 * The certificate as PEM
326 */
327 char cert[MAX_PEM_SIZE];
328
329 /**
330 * The private key as PEM
331 */
332 char key[MAX_PEM_SIZE];
333};
334
335
336/**
337 * A structure for all running Httpds
338 */
339struct MhdHttpList
340{
341 /**
342 * DLL for httpds
343 */
344 struct MhdHttpList *prev;
345
346 /**
347 * DLL for httpds
348 */
349 struct MhdHttpList *next;
350
351 /**
352 * the domain name to server (only important for TLS)
353 */
354 char *domain;
355
356 /**
357 * The daemon handle
358 */
359 struct MHD_Daemon *daemon;
360
361 /**
362 * Optional proxy certificate used
363 */
364 struct ProxyGNSCertificate *proxy_cert;
365
366 /**
367 * The task ID
368 */
369 struct GNUNET_SCHEDULER_Task *httpd_task;
370
371 /**
372 * is this an ssl daemon?
373 */
374 int is_ssl;
375};
376
377
378/* ***************** Datastructures for Socks handling **************** */
379
380
381/**
382 * The socks phases.
383 */
384enum SocksPhase
385{
386 /**
387 * We're waiting to get the client hello.
388 */
389 SOCKS5_INIT,
390
391 /**
392 * We're waiting to get the initial request.
393 */
394 SOCKS5_REQUEST,
395
396 /**
397 * We are currently resolving the destination.
398 */
399 SOCKS5_RESOLVING,
400
401 /**
402 * We're in transfer mode.
403 */
404 SOCKS5_DATA_TRANSFER,
405
406 /**
407 * Finish writing the write buffer, then clean up.
408 */
409 SOCKS5_WRITE_THEN_CLEANUP,
410
411 /**
412 * Socket has been passed to MHD, do not close it anymore.
413 */
414 SOCKS5_SOCKET_WITH_MHD,
415
416 /**
417 * We've started receiving upload data from MHD.
418 */
419 SOCKS5_SOCKET_UPLOAD_STARTED,
420
421 /**
422 * We've finished receiving upload data from MHD.
423 */
424 SOCKS5_SOCKET_UPLOAD_DONE,
425
426 /**
427 * We've finished uploading data via CURL and can now download.
428 */
429 SOCKS5_SOCKET_DOWNLOAD_STARTED,
430
431 /**
432 * We've finished receiving download data from cURL.
433 */
434 SOCKS5_SOCKET_DOWNLOAD_DONE
435};
436
437
438/**
439 * A header list
440 */
441struct HttpResponseHeader
442{
443 /**
444 * DLL
445 */
446 struct HttpResponseHeader *next;
447
448 /**
449 * DLL
450 */
451 struct HttpResponseHeader *prev;
452
453 /**
454 * Header type
455 */
456 char *type;
457
458 /**
459 * Header value
460 */
461 char *value;
462};
463
464/**
465 * A structure for socks requests
466 */
467struct Socks5Request
468{
469 /**
470 * DLL.
471 */
472 struct Socks5Request *next;
473
474 /**
475 * DLL.
476 */
477 struct Socks5Request *prev;
478
479 /**
480 * The client socket
481 */
482 struct GNUNET_NETWORK_Handle *sock;
483
484 /**
485 * Handle to GNS lookup, during #SOCKS5_RESOLVING phase.
486 */
487 struct GNUNET_GNS_LookupWithTldRequest *gns_lookup;
488
489 /**
490 * Client socket read task
491 */
492 struct GNUNET_SCHEDULER_Task *rtask;
493
494 /**
495 * Client socket write task
496 */
497 struct GNUNET_SCHEDULER_Task *wtask;
498
499 /**
500 * Timeout task
501 */
502 struct GNUNET_SCHEDULER_Task *timeout_task;
503
504 /**
505 * Read buffer
506 */
507 char rbuf[SOCKS_BUFFERSIZE];
508
509 /**
510 * Write buffer
511 */
512 char wbuf[SOCKS_BUFFERSIZE];
513
514 /**
515 * Buffer we use for moving data between MHD and curl (in both directions).
516 */
517 char io_buf[IO_BUFFERSIZE];
518
519 /**
520 * MHD HTTP instance handling this request, NULL for none.
521 */
522 struct MhdHttpList *hd;
523
524 /**
525 * MHD connection for this request.
526 */
527 struct MHD_Connection *con;
528
529 /**
530 * MHD response object for this request.
531 */
532 struct MHD_Response *response;
533
534 /**
535 * the domain name to server (only important for TLS)
536 */
537 char *domain;
538
539 /**
540 * DNS Legacy Host Name as given by GNS, NULL if not given.
541 */
542 char *leho;
543
544 /**
545 * Payload of the DANE records encountered.
546 */
547 char *dane_data[MAX_DANES + 1];
548
549 /**
550 * The URL to fetch
551 */
552 char *url;
553
554 /**
555 * Handle to cURL
556 */
557 CURL *curl;
558
559 /**
560 * HTTP request headers for the curl request.
561 */
562 struct curl_slist *headers;
563
564 /**
565 * DNS->IP mappings resolved through GNS
566 */
567 struct curl_slist *hosts;
568
569 /**
570 * HTTP response code to give to MHD for the response.
571 */
572 unsigned int response_code;
573
574 /**
575 * Number of bytes in @e dane_data.
576 */
577 int dane_data_len[MAX_DANES + 1];
578
579 /**
580 * Number of entries used in @e dane_data_len
581 * and @e dane_data.
582 */
583 unsigned int num_danes;
584
585 /**
586 * Number of bytes already in read buffer
587 */
588 size_t rbuf_len;
589
590 /**
591 * Number of bytes already in write buffer
592 */
593 size_t wbuf_len;
594
595 /**
596 * Number of bytes already in the IO buffer.
597 */
598 size_t io_len;
599
600 /**
601 * Once known, what's the target address for the connection?
602 */
603 struct sockaddr_storage destination_address;
604
605 /**
606 * The socks state
607 */
608 enum SocksPhase state;
609
610 /**
611 * Desired destination port.
612 */
613 uint16_t port;
614
615 /**
616 * Headers from response
617 */
618 struct HttpResponseHeader *header_head;
619
620 /**
621 * Headers from response
622 */
623 struct HttpResponseHeader *header_tail;
624
625 /**
626 * X.509 Certificate status
627 */
628 int ssl_checked;
629
630 /**
631 * Was the hostname resolved via GNS?
632 */
633 int is_gns;
634
635 /**
636 * This is (probably) a TLS connection
637 */
638 int is_tls;
639
640 /**
641 * Did we suspend MHD processing?
642 */
643 int suspended;
644
645 /**
646 * Did we pause CURL processing?
647 */
648 int curl_paused;
649};
650
651
652/* *********************** Globals **************************** */
653
654/**
655 * The address to bind to
656 */
657static in_addr_t address;
658
659/**
660 * The IPv6 address to bind to
661 */
662static struct in6_addr address6;
663
664/**
665 * The port the proxy is running on (default 7777)
666 */
667static uint16_t port = GNUNET_GNS_PROXY_PORT;
668
669/**
670 * The CA file (pem) to use for the proxy CA
671 */
672static char *cafile_opt;
673
674/**
675 * The listen socket of the proxy for IPv4
676 */
677static struct GNUNET_NETWORK_Handle *lsock4;
678
679/**
680 * The listen socket of the proxy for IPv6
681 */
682static struct GNUNET_NETWORK_Handle *lsock6;
683
684/**
685 * The listen task ID for IPv4
686 */
687static struct GNUNET_SCHEDULER_Task *ltask4;
688
689/**
690 * The listen task ID for IPv6
691 */
692static struct GNUNET_SCHEDULER_Task *ltask6;
693
694/**
695 * The cURL download task (curl multi API).
696 */
697static struct GNUNET_SCHEDULER_Task *curl_download_task;
698
699/**
700 * The cURL multi handle
701 */
702static CURLM *curl_multi;
703
704/**
705 * Handle to the GNS service
706 */
707static struct GNUNET_GNS_Handle *gns_handle;
708
709/**
710 * Disable IPv6.
711 */
712static int disable_v6;
713
714/**
715 * DLL for http/https daemons
716 */
717static struct MhdHttpList *mhd_httpd_head;
718
719/**
720 * DLL for http/https daemons
721 */
722static struct MhdHttpList *mhd_httpd_tail;
723
724/**
725 * Daemon for HTTP (we have one per X.509 certificate, and then one for
726 * all HTTP connections; this is the one for HTTP, not HTTPS).
727 */
728static struct MhdHttpList *httpd;
729
730/**
731 * DLL of active socks requests.
732 */
733static struct Socks5Request *s5r_head;
734
735/**
736 * DLL of active socks requests.
737 */
738static struct Socks5Request *s5r_tail;
739
740/**
741 * The CA for X.509 certificate generation
742 */
743static struct ProxyCA proxy_ca;
744
745/**
746 * Response we return on cURL failures.
747 */
748static struct MHD_Response *curl_failure_response;
749
750/**
751 * Our configuration.
752 */
753static const struct GNUNET_CONFIGURATION_Handle *cfg;
754
755
756/* ************************* Global helpers ********************* */
757
758
759/**
760 * Run MHD now, we have extra data ready for the callback.
761 *
762 * @param hd the daemon to run now.
763 */
764static void
765run_mhd_now (struct MhdHttpList *hd);
766
767
768/**
769 * Clean up s5r handles.
770 *
771 * @param s5r the handle to destroy
772 */
773static void
774cleanup_s5r (struct Socks5Request *s5r)
775{
776 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
777 "Cleaning up socks request\n");
778 if (NULL != s5r->curl)
779 {
780 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
781 "Cleaning up cURL handle\n");
782 curl_multi_remove_handle (curl_multi,
783 s5r->curl);
784 curl_easy_cleanup (s5r->curl);
785 s5r->curl = NULL;
786 }
787 if (s5r->suspended)
788 {
789 s5r->suspended = GNUNET_NO;
790 MHD_resume_connection (s5r->con);
791 }
792 curl_slist_free_all (s5r->headers);
793 if (NULL != s5r->hosts)
794 {
795 curl_slist_free_all (s5r->hosts);
796 }
797 if ((NULL != s5r->response) &&
798 (curl_failure_response != s5r->response))
799 {
800 MHD_destroy_response (s5r->response);
801 s5r->response = NULL;
802 }
803 if (NULL != s5r->rtask)
804 {
805 GNUNET_SCHEDULER_cancel (s5r->rtask);
806 s5r->rtask = NULL;
807 }
808 if (NULL != s5r->timeout_task)
809 {
810 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
811 s5r->timeout_task = NULL;
812 }
813 if (NULL != s5r->wtask)
814 {
815 GNUNET_SCHEDULER_cancel (s5r->wtask);
816 s5r->wtask = NULL;
817 }
818 if (NULL != s5r->gns_lookup)
819 {
820 GNUNET_GNS_lookup_with_tld_cancel (s5r->gns_lookup);
821 s5r->gns_lookup = NULL;
822 }
823 if (NULL != s5r->sock)
824 {
825 if (SOCKS5_SOCKET_WITH_MHD <= s5r->state)
826 GNUNET_NETWORK_socket_free_memory_only_ (s5r->sock);
827 else
828 GNUNET_NETWORK_socket_close (s5r->sock);
829 s5r->sock = NULL;
830 }
831 GNUNET_CONTAINER_DLL_remove (s5r_head,
832 s5r_tail,
833 s5r);
834 GNUNET_free (s5r->domain);
835 GNUNET_free (s5r->leho);
836 GNUNET_free (s5r->url);
837 for (unsigned int i = 0; i < s5r->num_danes; i++)
838 GNUNET_free (s5r->dane_data[i]);
839 GNUNET_free (s5r);
840}
841
842
843/* ************************* HTTP handling with cURL *********************** */
844
845static void
846curl_download_prepare ();
847
848
849/**
850 * Callback for MHD response generation. This function is called from
851 * MHD whenever MHD expects to get data back. Copies data from the
852 * io_buf, if available.
853 *
854 * @param cls closure with our `struct Socks5Request`
855 * @param pos in buffer
856 * @param buf where to copy data
857 * @param max available space in @a buf
858 * @return number of bytes written to @a buf
859 */
860static ssize_t
861mhd_content_cb (void *cls,
862 uint64_t pos,
863 char*buf,
864 size_t max)
865{
866 struct Socks5Request *s5r = cls;
867 size_t bytes_to_copy;
868
869 if ((SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
870 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state))
871 {
872 /* we're still not done with the upload, do not yet
873 start the download, the IO buffer is still full
874 with upload data. */
875 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
876 "Pausing MHD download %s%s, not yet ready for download\n",
877 s5r->domain,
878 s5r->url);
879 return 0; /* not yet ready for data download */
880 }
881 bytes_to_copy = GNUNET_MIN (max,
882 s5r->io_len);
883 if ((0 == bytes_to_copy) &&
884 (SOCKS5_SOCKET_DOWNLOAD_DONE != s5r->state))
885 {
886 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
887 "Pausing MHD download %s%s, no data available\n",
888 s5r->domain,
889 s5r->url);
890 if (NULL != s5r->curl)
891 {
892 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
893 "Continuing CURL interaction for %s%s\n",
894 s5r->domain,
895 s5r->url);
896 if (GNUNET_YES == s5r->curl_paused)
897 {
898 s5r->curl_paused = GNUNET_NO;
899 curl_easy_pause (s5r->curl,
900 CURLPAUSE_CONT);
901 }
902 curl_download_prepare ();
903 }
904 if (GNUNET_NO == s5r->suspended)
905 {
906 MHD_suspend_connection (s5r->con);
907 s5r->suspended = GNUNET_YES;
908 }
909 return 0; /* more data later */
910 }
911 if ((0 == bytes_to_copy) &&
912 (SOCKS5_SOCKET_DOWNLOAD_DONE == s5r->state))
913 {
914 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
915 "Completed MHD download %s%s\n",
916 s5r->domain,
917 s5r->url);
918 return MHD_CONTENT_READER_END_OF_STREAM;
919 }
920 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
921 "Writing %llu/%llu bytes to %s%s\n",
922 (unsigned long long) bytes_to_copy,
923 (unsigned long long) s5r->io_len,
924 s5r->domain,
925 s5r->url);
926 GNUNET_memcpy (buf,
927 s5r->io_buf,
928 bytes_to_copy);
929 memmove (s5r->io_buf,
930 &s5r->io_buf[bytes_to_copy],
931 s5r->io_len - bytes_to_copy);
932 s5r->io_len -= bytes_to_copy;
933 if ((NULL != s5r->curl) &&
934 (GNUNET_YES == s5r->curl_paused))
935 {
936 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
937 "Continuing CURL interaction for %s%s\n",
938 s5r->domain,
939 s5r->url);
940 s5r->curl_paused = GNUNET_NO;
941 curl_easy_pause (s5r->curl,
942 CURLPAUSE_CONT);
943 }
944 return bytes_to_copy;
945}
946
947
948/**
949 * Check that the website has presented us with a valid X.509 certificate.
950 * The certificate must either match the domain name or the LEHO name
951 * (or, if available, the TLSA record).
952 *
953 * @param s5r request to check for.
954 * @return #GNUNET_OK if the certificate is valid
955 */
956static int
957check_ssl_certificate (struct Socks5Request *s5r)
958{
959 unsigned int cert_list_size;
960 const gnutls_datum_t *chainp;
961 const struct curl_tlssessioninfo *tlsinfo;
962 char certdn[GNUNET_DNSPARSER_MAX_NAME_LENGTH + 3];
963 size_t size;
964 gnutls_x509_crt_t x509_cert;
965 int rc;
966 const char *name;
967
968 s5r->ssl_checked = GNUNET_YES;
969 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
970 "Checking X.509 certificate\n");
971 if (CURLE_OK !=
972 curl_easy_getinfo (s5r->curl,
973 CURLINFO_TLS_SESSION,
974 &tlsinfo))
975 return GNUNET_SYSERR;
976 if (CURLSSLBACKEND_GNUTLS != tlsinfo->backend)
977 {
978 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
979 _ ("Unsupported CURL TLS backend %d\n"),
980 tlsinfo->backend);
981 return GNUNET_SYSERR;
982 }
983 chainp = gnutls_certificate_get_peers (tlsinfo->internals,
984 &cert_list_size);
985 if ((! chainp) ||
986 (0 == cert_list_size))
987 return GNUNET_SYSERR;
988
989 size = sizeof(certdn);
990 /* initialize an X.509 certificate structure. */
991 gnutls_x509_crt_init (&x509_cert);
992 gnutls_x509_crt_import (x509_cert,
993 chainp,
994 GNUTLS_X509_FMT_DER);
995
996 if (0 != (rc = gnutls_x509_crt_get_dn_by_oid (x509_cert,
997 GNUTLS_OID_X520_COMMON_NAME,
998 0, /* the first and only one */
999 0 /* no DER encoding */,
1000 certdn,
1001 &size)))
1002 {
1003 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1004 _ ("Failed to fetch CN from cert: %s\n"),
1005 gnutls_strerror (rc));
1006 gnutls_x509_crt_deinit (x509_cert);
1007 return GNUNET_SYSERR;
1008 }
1009 /* check for TLSA/DANE records */
1010#if HAVE_GNUTLS_DANE
1011 if (0 != s5r->num_danes)
1012 {
1013 dane_state_t dane_state;
1014 dane_query_t dane_query;
1015 unsigned int verify;
1016
1017 /* FIXME: add flags to gnutls to NOT read UNBOUND_ROOT_KEY_FILE here! */
1018 if (0 != (rc = dane_state_init (&dane_state,
1019#ifdef DANE_F_IGNORE_DNSSEC
1020 DANE_F_IGNORE_DNSSEC |
1021#endif
1022 DANE_F_IGNORE_LOCAL_RESOLVER)))
1023 {
1024 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1025 _ ("Failed to initialize DANE: %s\n"),
1026 dane_strerror (rc));
1027 gnutls_x509_crt_deinit (x509_cert);
1028 return GNUNET_SYSERR;
1029 }
1030 s5r->dane_data[s5r->num_danes] = NULL;
1031 s5r->dane_data_len[s5r->num_danes] = 0;
1032 if (0 != (rc = dane_raw_tlsa (dane_state,
1033 &dane_query,
1034 s5r->dane_data,
1035 s5r->dane_data_len,
1036 GNUNET_YES,
1037 GNUNET_NO)))
1038 {
1039 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1040 _ ("Failed to parse DANE record: %s\n"),
1041 dane_strerror (rc));
1042 dane_state_deinit (dane_state);
1043 gnutls_x509_crt_deinit (x509_cert);
1044 return GNUNET_SYSERR;
1045 }
1046 if (0 != (rc = dane_verify_crt_raw (dane_state,
1047 chainp,
1048 cert_list_size,
1049 gnutls_certificate_type_get (
1050 tlsinfo->internals),
1051 dane_query,
1052 0, 0,
1053 &verify)))
1054 {
1055 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1056 _ ("Failed to verify TLS connection using DANE: %s\n"),
1057 dane_strerror (rc));
1058 dane_query_deinit (dane_query);
1059 dane_state_deinit (dane_state);
1060 gnutls_x509_crt_deinit (x509_cert);
1061 return GNUNET_SYSERR;
1062 }
1063 if (0 != verify)
1064 {
1065 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1066 _ (
1067 "Failed DANE verification failed with GnuTLS verify status code: %u\n"),
1068 verify);
1069 dane_query_deinit (dane_query);
1070 dane_state_deinit (dane_state);
1071 gnutls_x509_crt_deinit (x509_cert);
1072 return GNUNET_SYSERR;
1073 }
1074 dane_query_deinit (dane_query);
1075 dane_state_deinit (dane_state);
1076 /* success! */
1077 }
1078 else
1079#endif
1080 {
1081 /* try LEHO or ordinary domain name X509 verification */
1082 name = s5r->domain;
1083 if (NULL != s5r->leho)
1084 name = s5r->leho;
1085 if (NULL != name)
1086 {
1087 if (0 == (rc = gnutls_x509_crt_check_hostname (x509_cert,
1088 name)))
1089 {
1090 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1091 _ (
1092 "TLS certificate subject name (%s) does not match `%s': %d\n"),
1093 certdn,
1094 name,
1095 rc);
1096 gnutls_x509_crt_deinit (x509_cert);
1097 return GNUNET_SYSERR;
1098 }
1099 }
1100 else
1101 {
1102 /* we did not even have the domain name!? */
1103 GNUNET_break (0);
1104 return GNUNET_SYSERR;
1105 }
1106 }
1107 gnutls_x509_crt_deinit (x509_cert);
1108 return GNUNET_OK;
1109}
1110
1111
1112/**
1113 * We're getting an HTTP response header from cURL. Convert it to the
1114 * MHD response headers. Mostly copies the headers, but makes special
1115 * adjustments to "Set-Cookie" and "Location" headers as those may need
1116 * to be changed from the LEHO to the domain the browser expects.
1117 *
1118 * @param buffer curl buffer with a single line of header data; not 0-terminated!
1119 * @param size curl blocksize
1120 * @param nmemb curl blocknumber
1121 * @param cls our `struct Socks5Request *`
1122 * @return size of processed bytes
1123 */
1124static size_t
1125curl_check_hdr (void *buffer,
1126 size_t size,
1127 size_t nmemb,
1128 void *cls)
1129{
1130 struct Socks5Request *s5r = cls;
1131 struct HttpResponseHeader *header;
1132 size_t bytes = size * nmemb;
1133 char *ndup;
1134 const char *hdr_type;
1135 const char *cookie_domain;
1136 char *hdr_val;
1137 char *new_cookie_hdr;
1138 char *new_location;
1139 size_t offset;
1140 size_t delta_cdomain;
1141 int domain_matched;
1142 char *tok;
1143
1144 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1145 "Receiving HTTP response header from CURL\n");
1146 /* first, check TLS certificate */
1147 if ((GNUNET_YES != s5r->ssl_checked) &&
1148 (GNUNET_YES == s5r->is_tls))
1149 // (HTTPS_PORT == s5r->port))
1150 {
1151 if (GNUNET_OK != check_ssl_certificate (s5r))
1152 return 0;
1153 }
1154 ndup = GNUNET_strndup (buffer,
1155 bytes);
1156 hdr_type = strtok (ndup,
1157 ":");
1158 if (NULL == hdr_type)
1159 {
1160 GNUNET_free (ndup);
1161 return bytes;
1162 }
1163 hdr_val = strtok (NULL,
1164 "");
1165 if (NULL == hdr_val)
1166 {
1167 GNUNET_free (ndup);
1168 return bytes;
1169 }
1170 if (' ' == *hdr_val)
1171 hdr_val++;
1172
1173 /* custom logic for certain header types */
1174 new_cookie_hdr = NULL;
1175 if ((NULL != s5r->leho) &&
1176 (0 == strcasecmp (hdr_type,
1177 MHD_HTTP_HEADER_SET_COOKIE)))
1178
1179 {
1180 new_cookie_hdr = GNUNET_malloc (strlen (hdr_val)
1181 + strlen (s5r->domain) + 1);
1182 offset = 0;
1183 domain_matched = GNUNET_NO; /* make sure we match domain at most once */
1184 for (tok = strtok (hdr_val, ";"); NULL != tok; tok = strtok (NULL, ";"))
1185 {
1186 if ((0 == strncasecmp (tok,
1187 " domain",
1188 strlen (" domain"))) &&
1189 (GNUNET_NO == domain_matched))
1190 {
1191 domain_matched = GNUNET_YES;
1192 cookie_domain = tok + strlen (" domain") + 1;
1193 if (strlen (cookie_domain) < strlen (s5r->leho))
1194 {
1195 delta_cdomain = strlen (s5r->leho) - strlen (cookie_domain);
1196 if (0 == strcasecmp (cookie_domain,
1197 s5r->leho + delta_cdomain))
1198 {
1199 offset += sprintf (new_cookie_hdr + offset,
1200 " domain=%s;",
1201 s5r->domain);
1202 continue;
1203 }
1204 }
1205 else if (0 == strcmp (cookie_domain,
1206 s5r->leho))
1207 {
1208 offset += sprintf (new_cookie_hdr + offset,
1209 " domain=%s;",
1210 s5r->domain);
1211 continue;
1212 }
1213 else if (('.' == cookie_domain[0]) &&
1214 (0 == strcmp (&cookie_domain[1],
1215 s5r->leho)))
1216 {
1217 offset += sprintf (new_cookie_hdr + offset,
1218 " domain=.%s;",
1219 s5r->domain);
1220 continue;
1221 }
1222 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1223 _ ("Cookie domain `%s' supplied by server is invalid\n"),
1224 tok);
1225 }
1226 GNUNET_memcpy (new_cookie_hdr + offset,
1227 tok,
1228 strlen (tok));
1229 offset += strlen (tok);
1230 new_cookie_hdr[offset++] = ';';
1231 }
1232 hdr_val = new_cookie_hdr;
1233 }
1234
1235 new_location = NULL;
1236 if (0 == strcasecmp (MHD_HTTP_HEADER_TRANSFER_ENCODING,
1237 hdr_type))
1238 {
1239 /* Ignore transfer encoding, set automatically by MHD if required */
1240 goto cleanup;
1241 }
1242 if ((0 == strcasecmp (MHD_HTTP_HEADER_LOCATION,
1243 hdr_type)))
1244 {
1245 char *leho_host;
1246
1247 GNUNET_asprintf (&leho_host,
1248 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1249 ? "http://%s"
1250 : "https://%s",
1251 s5r->leho);
1252 if (0 == strncmp (leho_host,
1253 hdr_val,
1254 strlen (leho_host)))
1255 {
1256 GNUNET_asprintf (&new_location,
1257 "%s%s%s",
1258 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1259 ? "http://"
1260 : "https://",
1261 s5r->domain,
1262 hdr_val + strlen (leho_host));
1263 hdr_val = new_location;
1264 }
1265 GNUNET_free (leho_host);
1266 }
1267 else if (0 == strcasecmp (MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN,
1268 hdr_type))
1269 {
1270 char *leho_host;
1271
1272 GNUNET_asprintf (&leho_host,
1273 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1274 ? "http://%s"
1275 : "https://%s",
1276 s5r->leho);
1277 if (0 == strncmp (leho_host,
1278 hdr_val,
1279 strlen (leho_host)))
1280 {
1281 GNUNET_asprintf (&new_location,
1282 "%s%s",
1283 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1284 ? "http://"
1285 : "https://",
1286 s5r->domain);
1287 hdr_val = new_location;
1288 }
1289 GNUNET_free (leho_host);
1290 }
1291
1292 /* MHD does not allow certain characters in values, remove those */
1293 if (NULL != (tok = strchr (hdr_val, '\n')))
1294 *tok = '\0';
1295 if (NULL != (tok = strchr (hdr_val, '\r')))
1296 *tok = '\0';
1297 if (NULL != (tok = strchr (hdr_val, '\t')))
1298 *tok = '\0';
1299 if (0 != strlen (hdr_val)) /* Rely in MHD to set those */
1300 {
1301 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1302 "Adding header %s: %s to MHD response\n",
1303 hdr_type,
1304 hdr_val);
1305 header = GNUNET_new (struct HttpResponseHeader);
1306 header->type = GNUNET_strdup (hdr_type);
1307 header->value = GNUNET_strdup (hdr_val);
1308 GNUNET_CONTAINER_DLL_insert (s5r->header_head,
1309 s5r->header_tail,
1310 header);
1311 }
1312cleanup:
1313 GNUNET_free (ndup);
1314 GNUNET_free (new_cookie_hdr);
1315 GNUNET_free (new_location);
1316 return bytes;
1317}
1318
1319
1320/**
1321 * Create an MHD response object in @a s5r matching the
1322 * information we got from curl.
1323 *
1324 * @param s5r the request for which we convert the response
1325 * @return #GNUNET_OK on success, #GNUNET_SYSERR if response was
1326 * already initialized before
1327 */
1328static int
1329create_mhd_response_from_s5r (struct Socks5Request *s5r)
1330{
1331 long resp_code;
1332 double content_length;
1333
1334 if (NULL != s5r->response)
1335 {
1336 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1337 "Response already set!\n");
1338 return GNUNET_SYSERR;
1339 }
1340
1341 GNUNET_break (CURLE_OK ==
1342 curl_easy_getinfo (s5r->curl,
1343 CURLINFO_RESPONSE_CODE,
1344 &resp_code));
1345 GNUNET_break (CURLE_OK ==
1346 curl_easy_getinfo (s5r->curl,
1347 CURLINFO_CONTENT_LENGTH_DOWNLOAD,
1348 &content_length));
1349 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1350 "Creating MHD response with code %d and size %d for %s%s\n",
1351 (int) resp_code,
1352 (int) content_length,
1353 s5r->domain,
1354 s5r->url);
1355 s5r->response_code = resp_code;
1356 s5r->response = MHD_create_response_from_callback ((-1 == content_length)
1357 ? MHD_SIZE_UNKNOWN
1358 : content_length,
1359 IO_BUFFERSIZE,
1360 &mhd_content_cb,
1361 s5r,
1362 NULL);
1363 for (struct HttpResponseHeader *header = s5r->header_head;
1364 NULL != header;
1365 header = header->next)
1366 {
1367 if (0 == strcasecmp (header->type,
1368 MHD_HTTP_HEADER_CONTENT_LENGTH))
1369 continue; /* MHD won't let us mess with those, for good reason */
1370 if ((0 == strcasecmp (header->type,
1371 MHD_HTTP_HEADER_TRANSFER_ENCODING)) &&
1372 ((0 == strcasecmp (header->value,
1373 "identity")) ||
1374 (0 == strcasecmp (header->value,
1375 "chunked"))))
1376 continue; /* MHD won't let us mess with those, for good reason */
1377 if (MHD_YES !=
1378 MHD_add_response_header (s5r->response,
1379 header->type,
1380 header->value))
1381 {
1382 GNUNET_break (0);
1383 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1384 "Failed to add header `%s:%s'\n",
1385 header->type,
1386 header->value);
1387 }
1388 }
1389 /* force connection to be closed after each request, as we
1390 do not support HTTP pipelining (yet, FIXME!) */
1391 /*GNUNET_break (MHD_YES ==
1392 MHD_add_response_header (s5r->response,
1393 MHD_HTTP_HEADER_CONNECTION,
1394 "close"));*/
1395 MHD_resume_connection (s5r->con);
1396 s5r->suspended = GNUNET_NO;
1397 return GNUNET_OK;
1398}
1399
1400
1401/**
1402 * Handle response payload data from cURL. Copies it into our `io_buf` to make
1403 * it available to MHD.
1404 *
1405 * @param ptr pointer to the data
1406 * @param size number of blocks of data
1407 * @param nmemb blocksize
1408 * @param ctx our `struct Socks5Request *`
1409 * @return number of bytes handled
1410 */
1411static size_t
1412curl_download_cb (void *ptr,
1413 size_t size,
1414 size_t nmemb,
1415 void*ctx)
1416{
1417 struct Socks5Request *s5r = ctx;
1418 size_t total = size * nmemb;
1419
1420 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1421 "Receiving %ux%u bytes for `%s%s' from cURL to download\n",
1422 (unsigned int) size,
1423 (unsigned int) nmemb,
1424 s5r->domain,
1425 s5r->url);
1426 if (NULL == s5r->response)
1427 GNUNET_assert (GNUNET_OK ==
1428 create_mhd_response_from_s5r (s5r));
1429 if ((SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) &&
1430 (0 == s5r->io_len))
1431 {
1432 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1433 "Previous upload finished... starting DOWNLOAD.\n");
1434 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1435 }
1436 if ((SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
1437 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state))
1438 {
1439 /* we're still not done with the upload, do not yet
1440 start the download, the IO buffer is still full
1441 with upload data. */
1442 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1443 "Pausing CURL download `%s%s', waiting for UPLOAD to finish\n",
1444 s5r->domain,
1445 s5r->url);
1446 s5r->curl_paused = GNUNET_YES;
1447 return CURL_WRITEFUNC_PAUSE; /* not yet ready for data download */
1448 }
1449 if (sizeof(s5r->io_buf) - s5r->io_len < total)
1450 {
1451 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1452 "Pausing CURL `%s%s' download, not enough space %llu %llu %llu\n",
1453 s5r->domain,
1454 s5r->url,
1455 (unsigned long long) sizeof(s5r->io_buf),
1456 (unsigned long long) s5r->io_len,
1457 (unsigned long long) total);
1458 s5r->curl_paused = GNUNET_YES;
1459 return CURL_WRITEFUNC_PAUSE; /* not enough space */
1460 }
1461 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
1462 ptr,
1463 total);
1464 s5r->io_len += total;
1465 if (GNUNET_YES == s5r->suspended)
1466 {
1467 MHD_resume_connection (s5r->con);
1468 s5r->suspended = GNUNET_NO;
1469 }
1470 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1471 "Received %llu bytes of payload via cURL from %s\n",
1472 (unsigned long long) total,
1473 s5r->domain);
1474 if (s5r->io_len == total)
1475 run_mhd_now (s5r->hd);
1476 return total;
1477}
1478
1479
1480/**
1481 * cURL callback for uploaded (PUT/POST) data. Copies it into our `io_buf`
1482 * to make it available to MHD.
1483 *
1484 * @param buf where to write the data
1485 * @param size number of bytes per member
1486 * @param nmemb number of members available in @a buf
1487 * @param cls our `struct Socks5Request` that generated the data
1488 * @return number of bytes copied to @a buf
1489 */
1490static size_t
1491curl_upload_cb (void *buf,
1492 size_t size,
1493 size_t nmemb,
1494 void *cls)
1495{
1496 struct Socks5Request *s5r = cls;
1497 size_t len = size * nmemb;
1498 size_t to_copy;
1499
1500 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1501 "Receiving %ux%u bytes for `%s%s' from cURL to upload\n",
1502 (unsigned int) size,
1503 (unsigned int) nmemb,
1504 s5r->domain,
1505 s5r->url);
1506
1507 if ((0 == s5r->io_len) &&
1508 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state))
1509 {
1510 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1511 "Pausing CURL UPLOAD %s%s, need more data\n",
1512 s5r->domain,
1513 s5r->url);
1514 return CURL_READFUNC_PAUSE;
1515 }
1516 if ((0 == s5r->io_len) &&
1517 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state))
1518 {
1519 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1520 if (GNUNET_YES == s5r->curl_paused)
1521 {
1522 s5r->curl_paused = GNUNET_NO;
1523 curl_easy_pause (s5r->curl,
1524 CURLPAUSE_CONT);
1525 }
1526 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1527 "Completed CURL UPLOAD %s%s\n",
1528 s5r->domain,
1529 s5r->url);
1530 return 0; /* upload finished, can now download */
1531 }
1532 if ((SOCKS5_SOCKET_UPLOAD_STARTED != s5r->state) &&
1533 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state))
1534 {
1535 GNUNET_break (0);
1536 return CURL_READFUNC_ABORT;
1537 }
1538 to_copy = GNUNET_MIN (s5r->io_len,
1539 len);
1540 GNUNET_memcpy (buf,
1541 s5r->io_buf,
1542 to_copy);
1543 memmove (s5r->io_buf,
1544 &s5r->io_buf[to_copy],
1545 s5r->io_len - to_copy);
1546 s5r->io_len -= to_copy;
1547 if (s5r->io_len + to_copy == sizeof(s5r->io_buf))
1548 run_mhd_now (s5r->hd); /* got more space for upload now */
1549 return to_copy;
1550}
1551
1552
1553/* ************************** main loop of cURL interaction ****************** */
1554
1555
1556/**
1557 * Task that is run when we are ready to receive more data
1558 * from curl
1559 *
1560 * @param cls closure
1561 */
1562static void
1563curl_task_download (void *cls);
1564
1565
1566/**
1567 * Ask cURL for the select() sets and schedule cURL operations.
1568 */
1569static void
1570curl_download_prepare ()
1571{
1572 CURLMcode mret;
1573 fd_set rs;
1574 fd_set ws;
1575 fd_set es;
1576 int max;
1577 struct GNUNET_NETWORK_FDSet *grs;
1578 struct GNUNET_NETWORK_FDSet *gws;
1579 long to;
1580 struct GNUNET_TIME_Relative rtime;
1581
1582 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1583 "Scheduling CURL interaction\n");
1584 if (NULL != curl_download_task)
1585 {
1586 GNUNET_SCHEDULER_cancel (curl_download_task);
1587 curl_download_task = NULL;
1588 }
1589 max = -1;
1590 FD_ZERO (&rs);
1591 FD_ZERO (&ws);
1592 FD_ZERO (&es);
1593 if (CURLM_OK != (mret = curl_multi_fdset (curl_multi,
1594 &rs,
1595 &ws,
1596 &es,
1597 &max)))
1598 {
1599 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1600 "%s failed at %s:%d: `%s'\n",
1601 "curl_multi_fdset", __FILE__, __LINE__,
1602 curl_multi_strerror (mret));
1603 return;
1604 }
1605 to = -1;
1606 GNUNET_break (CURLM_OK ==
1607 curl_multi_timeout (curl_multi,
1608 &to));
1609 if (-1 == to)
1610 rtime = GNUNET_TIME_UNIT_FOREVER_REL;
1611 else
1612 rtime = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
1613 to);
1614 if (-1 != max)
1615 {
1616 grs = GNUNET_NETWORK_fdset_create ();
1617 gws = GNUNET_NETWORK_fdset_create ();
1618 GNUNET_NETWORK_fdset_copy_native (grs,
1619 &rs,
1620 max + 1);
1621 GNUNET_NETWORK_fdset_copy_native (gws,
1622 &ws,
1623 max + 1);
1624 curl_download_task = GNUNET_SCHEDULER_add_select (
1625 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1626 rtime,
1627 grs,
1628 gws,
1629 &curl_task_download,
1630 curl_multi);
1631 GNUNET_NETWORK_fdset_destroy (gws);
1632 GNUNET_NETWORK_fdset_destroy (grs);
1633 }
1634 else
1635 {
1636 curl_download_task = GNUNET_SCHEDULER_add_delayed (rtime,
1637 &curl_task_download,
1638 curl_multi);
1639 }
1640}
1641
1642
1643/**
1644 * Task that is run when we are ready to receive more data from curl.
1645 *
1646 * @param cls closure, NULL
1647 */
1648static void
1649curl_task_download (void *cls)
1650{
1651 int running;
1652 int msgnum;
1653 struct CURLMsg *msg;
1654 CURLMcode mret;
1655 struct Socks5Request *s5r;
1656
1657 curl_download_task = NULL;
1658 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1659 "Running CURL interaction\n");
1660 do
1661 {
1662 running = 0;
1663 mret = curl_multi_perform (curl_multi,
1664 &running);
1665 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1666 "Checking CURL multi status: %d\n",
1667 mret);
1668 while (NULL != (msg = curl_multi_info_read (curl_multi,
1669 &msgnum)))
1670 {
1671 GNUNET_break (CURLE_OK ==
1672 curl_easy_getinfo (msg->easy_handle,
1673 CURLINFO_PRIVATE,
1674 (char **) &s5r));
1675 if (NULL == s5r)
1676 {
1677 GNUNET_break (0);
1678 continue;
1679 }
1680 switch (msg->msg)
1681 {
1682 case CURLMSG_NONE:
1683 /* documentation says this is not used */
1684 GNUNET_break (0);
1685 break;
1686
1687 case CURLMSG_DONE:
1688 switch (msg->data.result)
1689 {
1690 case CURLE_OK:
1691 case CURLE_GOT_NOTHING:
1692 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1693 "CURL download %s%s completed.\n",
1694 s5r->domain,
1695 s5r->url);
1696 if (NULL == s5r->response)
1697 {
1698 GNUNET_assert (GNUNET_OK ==
1699 create_mhd_response_from_s5r (s5r));
1700 }
1701 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1702 if (GNUNET_YES == s5r->suspended)
1703 {
1704 MHD_resume_connection (s5r->con);
1705 s5r->suspended = GNUNET_NO;
1706 }
1707 run_mhd_now (s5r->hd);
1708 break;
1709
1710 default:
1711 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1712 "Download curl %s%s failed: %s\n",
1713 s5r->domain,
1714 s5r->url,
1715 curl_easy_strerror (msg->data.result));
1716 /* FIXME: indicate error somehow? close MHD connection badly as well? */
1717 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1718 if (GNUNET_YES == s5r->suspended)
1719 {
1720 MHD_resume_connection (s5r->con);
1721 s5r->suspended = GNUNET_NO;
1722 }
1723 run_mhd_now (s5r->hd);
1724 break;
1725 }
1726 if (NULL == s5r->response)
1727 s5r->response = curl_failure_response;
1728 break;
1729
1730 case CURLMSG_LAST:
1731 /* documentation says this is not used */
1732 GNUNET_break (0);
1733 break;
1734
1735 default:
1736 /* unexpected status code */
1737 GNUNET_break (0);
1738 break;
1739 }
1740 }
1741 ;
1742 }
1743 while (mret == CURLM_CALL_MULTI_PERFORM);
1744 if (CURLM_OK != mret)
1745 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1746 "%s failed at %s:%d: `%s'\n",
1747 "curl_multi_perform", __FILE__, __LINE__,
1748 curl_multi_strerror (mret));
1749 if (0 == running)
1750 {
1751 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1752 "Suspending cURL multi loop, no more events pending\n");
1753 if (NULL != curl_download_task)
1754 {
1755 GNUNET_SCHEDULER_cancel (curl_download_task);
1756 curl_download_task = NULL;
1757 }
1758 return; /* nothing more in progress */
1759 }
1760 curl_download_prepare ();
1761}
1762
1763
1764/* ********************************* MHD response generation ******************* */
1765
1766
1767/**
1768 * Read HTTP request header field from the request. Copies the fields
1769 * over to the 'headers' that will be given to curl. However, 'Host'
1770 * is substituted with the LEHO if present. We also change the
1771 * 'Connection' header value to "close" as the proxy does not support
1772 * pipelining.
1773 *
1774 * @param cls our `struct Socks5Request`
1775 * @param kind value kind
1776 * @param key field key
1777 * @param value field value
1778 * @return #MHD_YES to continue to iterate
1779 */
1780static int
1781con_val_iter (void *cls,
1782 enum MHD_ValueKind kind,
1783 const char *key,
1784 const char *value)
1785{
1786 struct Socks5Request *s5r = cls;
1787 char *hdr;
1788
1789 if ((0 == strcasecmp (MHD_HTTP_HEADER_HOST,
1790 key)) &&
1791 (NULL != s5r->leho))
1792 value = s5r->leho;
1793 GNUNET_asprintf (&hdr,
1794 "%s: %s",
1795 key,
1796 value);
1797 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1798 "Adding HEADER `%s' to HTTP request\n",
1799 hdr);
1800 s5r->headers = curl_slist_append (s5r->headers,
1801 hdr);
1802 GNUNET_free (hdr);
1803 return MHD_YES;
1804}
1805
1806
1807/**
1808 * Main MHD callback for handling requests.
1809 *
1810 * @param cls unused
1811 * @param con MHD connection handle
1812 * @param url the url in the request
1813 * @param meth the HTTP method used ("GET", "PUT", etc.)
1814 * @param ver the HTTP version string ("HTTP/1.1" for version 1.1, etc.)
1815 * @param upload_data the data being uploaded (excluding HEADERS,
1816 * for a POST that fits into memory and that is encoded
1817 * with a supported encoding, the POST data will NOT be
1818 * given in upload_data and is instead available as
1819 * part of MHD_get_connection_values; very large POST
1820 * data *will* be made available incrementally in
1821 * upload_data)
1822 * @param upload_data_size set initially to the size of the
1823 * @a upload_data provided; the method must update this
1824 * value to the number of bytes NOT processed;
1825 * @param con_cls pointer to location where we store the `struct Request`
1826 * @return #MHD_YES if the connection was handled successfully,
1827 * #MHD_NO if the socket must be closed due to a serious
1828 * error while handling the request
1829 */
1830static MHD_RESULT
1831create_response (void *cls,
1832 struct MHD_Connection *con,
1833 const char *url,
1834 const char *meth,
1835 const char *ver,
1836 const char *upload_data,
1837 size_t *upload_data_size,
1838 void **con_cls)
1839{
1840 struct Socks5Request *s5r = *con_cls;
1841 char *curlurl;
1842 char ipstring[INET6_ADDRSTRLEN];
1843 char ipaddr[INET6_ADDRSTRLEN + 2];
1844 char *curl_hosts;
1845 const struct sockaddr *sa;
1846 const struct sockaddr_in *s4;
1847 const struct sockaddr_in6 *s6;
1848 uint16_t port;
1849 size_t left;
1850
1851 if (NULL == s5r)
1852 {
1853 GNUNET_break (0);
1854 return MHD_NO;
1855 }
1856 s5r->con = con;
1857 /* Fresh connection. */
1858 if (SOCKS5_SOCKET_WITH_MHD == s5r->state)
1859 {
1860 /* first time here, initialize curl handle */
1861 if (s5r->is_gns)
1862 {
1863 sa = (const struct sockaddr *) &s5r->destination_address;
1864 switch (sa->sa_family)
1865 {
1866 case AF_INET:
1867 s4 = (const struct sockaddr_in *) &s5r->destination_address;
1868 if (NULL == inet_ntop (AF_INET,
1869 &s4->sin_addr,
1870 ipstring,
1871 sizeof(ipstring)))
1872 {
1873 GNUNET_break (0);
1874 return MHD_NO;
1875 }
1876 GNUNET_snprintf (ipaddr,
1877 sizeof(ipaddr),
1878 "%s",
1879 ipstring);
1880 port = ntohs (s4->sin_port);
1881 break;
1882
1883 case AF_INET6:
1884 s6 = (const struct sockaddr_in6 *) &s5r->destination_address;
1885 if (NULL == inet_ntop (AF_INET6,
1886 &s6->sin6_addr,
1887 ipstring,
1888 sizeof(ipstring)))
1889 {
1890 GNUNET_break (0);
1891 return MHD_NO;
1892 }
1893 GNUNET_snprintf (ipaddr,
1894 sizeof(ipaddr),
1895 "%s",
1896 ipstring);
1897 port = ntohs (s6->sin6_port);
1898 break;
1899
1900 default:
1901 GNUNET_break (0);
1902 return MHD_NO;
1903 }
1904 GNUNET_asprintf (&curl_hosts,
1905 "%s:%d:%s",
1906 s5r->leho,
1907 port,
1908 ipaddr);
1909 s5r->hosts = curl_slist_append (NULL,
1910 curl_hosts);
1911 GNUNET_free (curl_hosts);
1912 }
1913 else
1914 {
1915 port = s5r->port;
1916 }
1917 if (NULL == s5r->curl)
1918 s5r->curl = curl_easy_init ();
1919 if (NULL == s5r->curl)
1920 return MHD_queue_response (con,
1921 MHD_HTTP_INTERNAL_SERVER_ERROR,
1922 curl_failure_response);
1923 curl_easy_setopt (s5r->curl,
1924 CURLOPT_HEADERFUNCTION,
1925 &curl_check_hdr);
1926 curl_easy_setopt (s5r->curl,
1927 CURLOPT_HEADERDATA,
1928 s5r);
1929 curl_easy_setopt (s5r->curl,
1930 CURLOPT_FOLLOWLOCATION,
1931 0);
1932 if (s5r->is_gns)
1933 curl_easy_setopt (s5r->curl,
1934 CURLOPT_IPRESOLVE,
1935 CURL_IPRESOLVE_V4);
1936 curl_easy_setopt (s5r->curl,
1937 CURLOPT_CONNECTTIMEOUT,
1938 600L);
1939 curl_easy_setopt (s5r->curl,
1940 CURLOPT_TIMEOUT,
1941 600L);
1942 curl_easy_setopt (s5r->curl,
1943 CURLOPT_NOSIGNAL,
1944 1L);
1945 curl_easy_setopt (s5r->curl,
1946 CURLOPT_HTTP_CONTENT_DECODING,
1947 0);
1948 curl_easy_setopt (s5r->curl,
1949 CURLOPT_NOSIGNAL,
1950 1L);
1951 curl_easy_setopt (s5r->curl,
1952 CURLOPT_PRIVATE,
1953 s5r);
1954 curl_easy_setopt (s5r->curl,
1955 CURLOPT_VERBOSE,
1956 0L);
1957 /**
1958 * Pre-populate cache to resolve Hostname.
1959 * This is necessary as the DNS name in the CURLOPT_URL is used
1960 * for SNI http://de.wikipedia.org/wiki/Server_Name_Indication
1961 */
1962 if ((NULL != s5r->leho) &&
1963 (NULL != s5r->hosts))
1964 {
1965 curl_easy_setopt (s5r->curl,
1966 CURLOPT_RESOLVE,
1967 s5r->hosts);
1968 }
1969 if (s5r->is_gns)
1970 {
1971 GNUNET_asprintf (&curlurl,
1972 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1973 ? "http://%s:%d%s"
1974 : "https://%s:%d%s",
1975 (NULL != s5r->leho)
1976 ? s5r->leho
1977 : ipaddr,
1978 port,
1979 s5r->url);
1980 }
1981 else
1982 {
1983 GNUNET_asprintf (&curlurl,
1984 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1985 ? "http://%s:%d%s"
1986 : "https://%s:%d%s",
1987 s5r->domain,
1988 port,
1989 s5r->url);
1990 }
1991 curl_easy_setopt (s5r->curl,
1992 CURLOPT_URL,
1993 curlurl);
1994 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1995 "Launching %s CURL interaction, fetching `%s'\n",
1996 (s5r->is_gns) ? "GNS" : "DNS",
1997 curlurl);
1998 GNUNET_free (curlurl);
1999 if (0 == strcasecmp (meth,
2000 MHD_HTTP_METHOD_PUT))
2001 {
2002 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
2003 curl_easy_setopt (s5r->curl,
2004 CURLOPT_UPLOAD,
2005 1L);
2006 curl_easy_setopt (s5r->curl,
2007 CURLOPT_WRITEFUNCTION,
2008 &curl_download_cb);
2009 curl_easy_setopt (s5r->curl,
2010 CURLOPT_WRITEDATA,
2011 s5r);
2012 GNUNET_assert (CURLE_OK ==
2013 curl_easy_setopt (s5r->curl,
2014 CURLOPT_READFUNCTION,
2015 &curl_upload_cb));
2016 curl_easy_setopt (s5r->curl,
2017 CURLOPT_READDATA,
2018 s5r);
2019 {
2020 const char *us;
2021 long upload_size = 0;
2022
2023 us = MHD_lookup_connection_value (con,
2024 MHD_HEADER_KIND,
2025 MHD_HTTP_HEADER_CONTENT_LENGTH);
2026 if ((1 == sscanf (us,
2027 "%ld",
2028 &upload_size)) &&
2029 (upload_size >= 0))
2030 {
2031 curl_easy_setopt (s5r->curl,
2032 CURLOPT_INFILESIZE,
2033 upload_size);
2034 }
2035 }
2036 }
2037 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_POST))
2038 {
2039 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
2040 curl_easy_setopt (s5r->curl,
2041 CURLOPT_POST,
2042 1L);
2043 curl_easy_setopt (s5r->curl,
2044 CURLOPT_WRITEFUNCTION,
2045 &curl_download_cb);
2046 curl_easy_setopt (s5r->curl,
2047 CURLOPT_WRITEDATA,
2048 s5r);
2049 curl_easy_setopt (s5r->curl,
2050 CURLOPT_READFUNCTION,
2051 &curl_upload_cb);
2052 curl_easy_setopt (s5r->curl,
2053 CURLOPT_READDATA,
2054 s5r);
2055 {
2056 const char *us;
2057 long upload_size;
2058
2059 upload_size = 0;
2060 us = MHD_lookup_connection_value (con,
2061 MHD_HEADER_KIND,
2062 MHD_HTTP_HEADER_CONTENT_LENGTH);
2063 if ((NULL != us) &&
2064 (1 == sscanf (us,
2065 "%ld",
2066 &upload_size)) &&
2067 (upload_size >= 0))
2068 {
2069 curl_easy_setopt (s5r->curl,
2070 CURLOPT_INFILESIZE,
2071 upload_size);
2072 }
2073 else
2074 {
2075 curl_easy_setopt (s5r->curl,
2076 CURLOPT_INFILESIZE,
2077 upload_size);
2078 }
2079 }
2080 }
2081 else if (0 == strcasecmp (meth,
2082 MHD_HTTP_METHOD_HEAD))
2083 {
2084 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2085 curl_easy_setopt (s5r->curl,
2086 CURLOPT_NOBODY,
2087 1L);
2088 }
2089 else if (0 == strcasecmp (meth,
2090 MHD_HTTP_METHOD_OPTIONS))
2091 {
2092 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2093 curl_easy_setopt (s5r->curl,
2094 CURLOPT_CUSTOMREQUEST,
2095 "OPTIONS");
2096 curl_easy_setopt (s5r->curl,
2097 CURLOPT_WRITEFUNCTION,
2098 &curl_download_cb);
2099 curl_easy_setopt (s5r->curl,
2100 CURLOPT_WRITEDATA,
2101 s5r);
2102 }
2103 else if (0 == strcasecmp (meth,
2104 MHD_HTTP_METHOD_GET))
2105 {
2106 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2107 curl_easy_setopt (s5r->curl,
2108 CURLOPT_HTTPGET,
2109 1L);
2110 curl_easy_setopt (s5r->curl,
2111 CURLOPT_WRITEFUNCTION,
2112 &curl_download_cb);
2113 curl_easy_setopt (s5r->curl,
2114 CURLOPT_WRITEDATA,
2115 s5r);
2116 }
2117 else if (0 == strcasecmp (meth,
2118 MHD_HTTP_METHOD_DELETE))
2119 {
2120 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2121 curl_easy_setopt (s5r->curl,
2122 CURLOPT_CUSTOMREQUEST,
2123 "DELETE");
2124 curl_easy_setopt (s5r->curl,
2125 CURLOPT_WRITEFUNCTION,
2126 &curl_download_cb);
2127 curl_easy_setopt (s5r->curl,
2128 CURLOPT_WRITEDATA,
2129 s5r);
2130 }
2131 else
2132 {
2133 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2134 _ ("Unsupported HTTP method `%s'\n"),
2135 meth);
2136 curl_easy_cleanup (s5r->curl);
2137 s5r->curl = NULL;
2138 return MHD_NO;
2139 }
2140
2141 if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_0))
2142 {
2143 curl_easy_setopt (s5r->curl,
2144 CURLOPT_HTTP_VERSION,
2145 CURL_HTTP_VERSION_1_0);
2146 }
2147 else if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_1))
2148 {
2149 curl_easy_setopt (s5r->curl,
2150 CURLOPT_HTTP_VERSION,
2151 CURL_HTTP_VERSION_1_1);
2152 }
2153 else
2154 {
2155 curl_easy_setopt (s5r->curl,
2156 CURLOPT_HTTP_VERSION,
2157 CURL_HTTP_VERSION_NONE);
2158 }
2159
2160 if (GNUNET_YES == s5r->is_tls) // (HTTPS_PORT == s5r->port)
2161 {
2162 curl_easy_setopt (s5r->curl,
2163 CURLOPT_USE_SSL,
2164 CURLUSESSL_ALL);
2165 if (0 < s5r->num_danes)
2166 curl_easy_setopt (s5r->curl,
2167 CURLOPT_SSL_VERIFYPEER,
2168 0L);
2169 else
2170 curl_easy_setopt (s5r->curl,
2171 CURLOPT_SSL_VERIFYPEER,
2172 1L);
2173 /* Disable cURL checking the hostname, as we will check ourselves
2174 as only we have the domain name or the LEHO or the DANE record */
2175 curl_easy_setopt (s5r->curl,
2176 CURLOPT_SSL_VERIFYHOST,
2177 0L);
2178 }
2179 else
2180 {
2181 curl_easy_setopt (s5r->curl,
2182 CURLOPT_USE_SSL,
2183 CURLUSESSL_NONE);
2184 }
2185
2186 if (CURLM_OK !=
2187 curl_multi_add_handle (curl_multi,
2188 s5r->curl))
2189 {
2190 GNUNET_break (0);
2191 curl_easy_cleanup (s5r->curl);
2192 s5r->curl = NULL;
2193 return MHD_NO;
2194 }
2195 MHD_get_connection_values (con,
2196 MHD_HEADER_KIND,
2197 (MHD_KeyValueIterator) & con_val_iter,
2198 s5r);
2199 curl_easy_setopt (s5r->curl,
2200 CURLOPT_HTTPHEADER,
2201 s5r->headers);
2202 curl_download_prepare ();
2203 return MHD_YES;
2204 }
2205
2206 /* continuing to process request */
2207 if (0 != *upload_data_size)
2208 {
2209 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2210 "Processing %u bytes UPLOAD\n",
2211 (unsigned int) *upload_data_size);
2212
2213 /* FIXME: This must be set or a header with Transfer-Encoding: chunked. Else
2214 * upload callback is not called!
2215 */
2216 curl_easy_setopt (s5r->curl,
2217 CURLOPT_POSTFIELDSIZE,
2218 *upload_data_size);
2219
2220 left = GNUNET_MIN (*upload_data_size,
2221 sizeof(s5r->io_buf) - s5r->io_len);
2222 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
2223 upload_data,
2224 left);
2225 s5r->io_len += left;
2226 *upload_data_size -= left;
2227 GNUNET_assert (NULL != s5r->curl);
2228 if (GNUNET_YES == s5r->curl_paused)
2229 {
2230 s5r->curl_paused = GNUNET_NO;
2231 curl_easy_pause (s5r->curl,
2232 CURLPAUSE_CONT);
2233 }
2234 return MHD_YES;
2235 }
2236 if (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state)
2237 {
2238 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2239 "Finished processing UPLOAD\n");
2240 s5r->state = SOCKS5_SOCKET_UPLOAD_DONE;
2241 }
2242 if (NULL == s5r->response)
2243 {
2244 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2245 "Waiting for HTTP response for %s%s...\n",
2246 s5r->domain,
2247 s5r->url);
2248 MHD_suspend_connection (con);
2249 s5r->suspended = GNUNET_YES;
2250 return MHD_YES;
2251 }
2252 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2253 "Queueing response for %s%s with MHD\n",
2254 s5r->domain,
2255 s5r->url);
2256 run_mhd_now (s5r->hd);
2257 return MHD_queue_response (con,
2258 s5r->response_code,
2259 s5r->response);
2260}
2261
2262
2263/* ******************** MHD HTTP setup and event loop ******************** */
2264
2265
2266/**
2267 * Function called when MHD decides that we are done with a request.
2268 *
2269 * @param cls NULL
2270 * @param connection connection handle
2271 * @param con_cls value as set by the last call to
2272 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
2273 * @param toe reason for request termination (ignored)
2274 */
2275static void
2276mhd_completed_cb (void *cls,
2277 struct MHD_Connection *connection,
2278 void **con_cls,
2279 enum MHD_RequestTerminationCode toe)
2280{
2281 struct Socks5Request *s5r = *con_cls;
2282
2283 if (NULL == s5r)
2284 return;
2285 if (MHD_REQUEST_TERMINATED_COMPLETED_OK != toe)
2286 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2287 "MHD encountered error handling request: %d\n",
2288 toe);
2289 if (NULL != s5r->curl)
2290 {
2291 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2292 "Removing cURL handle (MHD interaction complete)\n");
2293 curl_multi_remove_handle (curl_multi,
2294 s5r->curl);
2295 curl_slist_free_all (s5r->headers);
2296 s5r->headers = NULL;
2297 curl_easy_reset (s5r->curl);
2298 s5r->rbuf_len = 0;
2299 s5r->wbuf_len = 0;
2300 s5r->io_len = 0;
2301 curl_download_prepare ();
2302 }
2303 if ((NULL != s5r->response) &&
2304 (curl_failure_response != s5r->response))
2305 MHD_destroy_response (s5r->response);
2306 for (struct HttpResponseHeader *header = s5r->header_head;
2307 NULL != header;
2308 header = s5r->header_head)
2309 {
2310 GNUNET_CONTAINER_DLL_remove (s5r->header_head,
2311 s5r->header_tail,
2312 header);
2313 GNUNET_free (header->type);
2314 GNUNET_free (header->value);
2315 GNUNET_free (header);
2316 }
2317 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2318 "Finished request for %s\n",
2319 s5r->url);
2320 GNUNET_free (s5r->url);
2321 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2322 s5r->url = NULL;
2323 s5r->response = NULL;
2324 *con_cls = NULL;
2325}
2326
2327
2328/**
2329 * Function called when MHD connection is opened or closed.
2330 *
2331 * @param cls NULL
2332 * @param connection connection handle
2333 * @param con_cls value as set by the last call to
2334 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
2335 * @param toe connection notification type
2336 */
2337static void
2338mhd_connection_cb (void *cls,
2339 struct MHD_Connection *connection,
2340 void **con_cls,
2341 enum MHD_ConnectionNotificationCode cnc)
2342{
2343 struct Socks5Request *s5r;
2344 const union MHD_ConnectionInfo *ci;
2345 int sock;
2346
2347 switch (cnc)
2348 {
2349 case MHD_CONNECTION_NOTIFY_STARTED:
2350 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection started...\n");
2351 ci = MHD_get_connection_info (connection,
2352 MHD_CONNECTION_INFO_CONNECTION_FD);
2353 if (NULL == ci)
2354 {
2355 GNUNET_break (0);
2356 return;
2357 }
2358 sock = ci->connect_fd;
2359 for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
2360 {
2361 if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
2362 {
2363 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2364 "Context set...\n");
2365 s5r->ssl_checked = GNUNET_NO;
2366 *con_cls = s5r;
2367 break;
2368 }
2369 }
2370 break;
2371
2372 case MHD_CONNECTION_NOTIFY_CLOSED:
2373 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2374 "Connection closed... cleaning up\n");
2375 s5r = *con_cls;
2376 if (NULL == s5r)
2377 {
2378 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2379 "Connection stale!\n");
2380 return;
2381 }
2382 cleanup_s5r (s5r);
2383 curl_download_prepare ();
2384 *con_cls = NULL;
2385 break;
2386
2387 default:
2388 GNUNET_break (0);
2389 }
2390}
2391
2392
2393/**
2394 * Function called when MHD first processes an incoming connection.
2395 * Gives us the respective URI information.
2396 *
2397 * We use this to associate the `struct MHD_Connection` with our
2398 * internal `struct Socks5Request` data structure (by checking
2399 * for matching sockets).
2400 *
2401 * @param cls the HTTP server handle (a `struct MhdHttpList`)
2402 * @param url the URL that is being requested
2403 * @param connection MHD connection object for the request
2404 * @return the `struct Socks5Request` that this @a connection is for
2405 */
2406static void *
2407mhd_log_callback (void *cls,
2408 const char *url,
2409 struct MHD_Connection *connection)
2410{
2411 struct Socks5Request *s5r;
2412 const union MHD_ConnectionInfo *ci;
2413
2414 ci = MHD_get_connection_info (connection,
2415 MHD_CONNECTION_INFO_SOCKET_CONTEXT);
2416 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Processing %s\n", url);
2417 if (NULL == ci)
2418 {
2419 GNUNET_break (0);
2420 return NULL;
2421 }
2422 s5r = ci->socket_context;
2423 if (NULL != s5r->url)
2424 {
2425 GNUNET_break (0);
2426 return NULL;
2427 }
2428 s5r->url = GNUNET_strdup (url);
2429 if (NULL != s5r->timeout_task)
2430 {
2431 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
2432 s5r->timeout_task = NULL;
2433 }
2434 GNUNET_assert (s5r->state == SOCKS5_SOCKET_WITH_MHD);
2435 return s5r;
2436}
2437
2438
2439/**
2440 * Kill the given MHD daemon.
2441 *
2442 * @param hd daemon to stop
2443 */
2444static void
2445kill_httpd (struct MhdHttpList *hd)
2446{
2447 GNUNET_CONTAINER_DLL_remove (mhd_httpd_head,
2448 mhd_httpd_tail,
2449 hd);
2450 GNUNET_free (hd->domain);
2451 MHD_stop_daemon (hd->daemon);
2452 if (NULL != hd->httpd_task)
2453 {
2454 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2455 hd->httpd_task = NULL;
2456 }
2457 GNUNET_free (hd->proxy_cert);
2458 if (hd == httpd)
2459 httpd = NULL;
2460 GNUNET_free (hd);
2461}
2462
2463
2464/**
2465 * Task run whenever HTTP server is idle for too long. Kill it.
2466 *
2467 * @param cls the `struct MhdHttpList *`
2468 */
2469static void
2470kill_httpd_task (void *cls)
2471{
2472 struct MhdHttpList *hd = cls;
2473
2474 hd->httpd_task = NULL;
2475 kill_httpd (hd);
2476}
2477
2478
2479/**
2480 * Task run whenever HTTP server operations are pending.
2481 *
2482 * @param cls the `struct MhdHttpList *` of the daemon that is being run
2483 */
2484static void
2485do_httpd (void *cls);
2486
2487
2488/**
2489 * Schedule MHD. This function should be called initially when an
2490 * MHD is first getting its client socket, and will then automatically
2491 * always be called later whenever there is work to be done.
2492 *
2493 * @param hd the daemon to schedule
2494 */
2495static void
2496schedule_httpd (struct MhdHttpList *hd)
2497{
2498 fd_set rs;
2499 fd_set ws;
2500 fd_set es;
2501 struct GNUNET_NETWORK_FDSet *wrs;
2502 struct GNUNET_NETWORK_FDSet *wws;
2503 int max;
2504 int haveto;
2505 MHD_UNSIGNED_LONG_LONG timeout;
2506 struct GNUNET_TIME_Relative tv;
2507
2508 FD_ZERO (&rs);
2509 FD_ZERO (&ws);
2510 FD_ZERO (&es);
2511 max = -1;
2512 if (MHD_YES !=
2513 MHD_get_fdset (hd->daemon,
2514 &rs,
2515 &ws,
2516 &es,
2517 &max))
2518 {
2519 kill_httpd (hd);
2520 return;
2521 }
2522 haveto = MHD_get_timeout (hd->daemon,
2523 &timeout);
2524 if (MHD_YES == haveto)
2525 tv.rel_value_us = (uint64_t) timeout * 1000LL;
2526 else
2527 tv = GNUNET_TIME_UNIT_FOREVER_REL;
2528 if (-1 != max)
2529 {
2530 wrs = GNUNET_NETWORK_fdset_create ();
2531 wws = GNUNET_NETWORK_fdset_create ();
2532 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
2533 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
2534 }
2535 else
2536 {
2537 wrs = NULL;
2538 wws = NULL;
2539 }
2540 if (NULL != hd->httpd_task)
2541 {
2542 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2543 hd->httpd_task = NULL;
2544 }
2545 if ((MHD_YES != haveto) &&
2546 (-1 == max) &&
2547 (hd != httpd))
2548 {
2549 /* daemon is idle, kill after timeout */
2550 hd->httpd_task = GNUNET_SCHEDULER_add_delayed (MHD_CACHE_TIMEOUT,
2551 &kill_httpd_task,
2552 hd);
2553 }
2554 else
2555 {
2556 hd->httpd_task =
2557 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2558 tv, wrs, wws,
2559 &do_httpd, hd);
2560 }
2561 if (NULL != wrs)
2562 GNUNET_NETWORK_fdset_destroy (wrs);
2563 if (NULL != wws)
2564 GNUNET_NETWORK_fdset_destroy (wws);
2565}
2566
2567
2568/**
2569 * Task run whenever HTTP server operations are pending.
2570 *
2571 * @param cls the `struct MhdHttpList` of the daemon that is being run
2572 */
2573static void
2574do_httpd (void *cls)
2575{
2576 struct MhdHttpList *hd = cls;
2577
2578 hd->httpd_task = NULL;
2579 MHD_run (hd->daemon);
2580 schedule_httpd (hd);
2581}
2582
2583
2584/**
2585 * Run MHD now, we have extra data ready for the callback.
2586 *
2587 * @param hd the daemon to run now.
2588 */
2589static void
2590run_mhd_now (struct MhdHttpList *hd)
2591{
2592 if (NULL != hd->httpd_task)
2593 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2594 hd->httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd,
2595 hd);
2596}
2597
2598
2599/**
2600 * Read file in filename
2601 *
2602 * @param filename file to read
2603 * @param size pointer where filesize is stored
2604 * @return NULL on error
2605 */
2606static void*
2607load_file (const char*filename,
2608 unsigned int*size)
2609{
2610 void *buffer;
2611 uint64_t fsize;
2612
2613 if (GNUNET_OK !=
2614 GNUNET_DISK_file_size (filename,
2615 &fsize,
2616 GNUNET_YES,
2617 GNUNET_YES))
2618 return NULL;
2619 if (fsize > MAX_PEM_SIZE)
2620 return NULL;
2621 *size = (unsigned int) fsize;
2622 buffer = GNUNET_malloc (*size);
2623 if (fsize !=
2624 GNUNET_DISK_fn_read (filename,
2625 buffer,
2626 (size_t) fsize))
2627 {
2628 GNUNET_free (buffer);
2629 return NULL;
2630 }
2631 return buffer;
2632}
2633
2634
2635/**
2636 * Load PEM key from file
2637 *
2638 * @param key where to store the data
2639 * @param keyfile path to the PEM file
2640 * @return #GNUNET_OK on success
2641 */
2642static int
2643load_key_from_file (gnutls_x509_privkey_t key,
2644 const char*keyfile)
2645{
2646 gnutls_datum_t key_data;
2647 int ret;
2648
2649 key_data.data = load_file (keyfile,
2650 &key_data.size);
2651 if (NULL == key_data.data)
2652 return GNUNET_SYSERR;
2653 ret = gnutls_x509_privkey_import (key, &key_data,
2654 GNUTLS_X509_FMT_PEM);
2655 if (GNUTLS_E_SUCCESS != ret)
2656 {
2657 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2658 _ ("Unable to import private key from file `%s'\n"),
2659 keyfile);
2660 }
2661 GNUNET_free (key_data.data);
2662 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2663}
2664
2665
2666/**
2667 * Load cert from file
2668 *
2669 * @param crt struct to store data in
2670 * @param certfile path to pem file
2671 * @return #GNUNET_OK on success
2672 */
2673static int
2674load_cert_from_file (gnutls_x509_crt_t crt,
2675 const char*certfile)
2676{
2677 gnutls_datum_t cert_data;
2678 int ret;
2679
2680 cert_data.data = load_file (certfile,
2681 &cert_data.size);
2682 if (NULL == cert_data.data)
2683 return GNUNET_SYSERR;
2684 ret = gnutls_x509_crt_import (crt,
2685 &cert_data,
2686 GNUTLS_X509_FMT_PEM);
2687 if (GNUTLS_E_SUCCESS != ret)
2688 {
2689 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2690 _ ("Unable to import certificate from `%s'\n"),
2691 certfile);
2692 }
2693 GNUNET_free (cert_data.data);
2694 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2695}
2696
2697
2698/**
2699 * Generate new certificate for specific name
2700 *
2701 * @param name the subject name to generate a cert for
2702 * @return a struct holding the PEM data, NULL on error
2703 */
2704static struct ProxyGNSCertificate *
2705generate_gns_certificate (const char *name)
2706{
2707 unsigned int serial;
2708 size_t key_buf_size;
2709 size_t cert_buf_size;
2710 gnutls_x509_crt_t request;
2711 time_t etime;
2712 struct tm *tm_data;
2713 struct ProxyGNSCertificate *pgc;
2714
2715 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2716 "Generating x.509 certificate for `%s'\n",
2717 name);
2718 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_init (&request));
2719 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_key (request,
2720 proxy_ca.key));
2721 pgc = GNUNET_new (struct ProxyGNSCertificate);
2722 gnutls_x509_crt_set_dn_by_oid (request,
2723 GNUTLS_OID_X520_COUNTRY_NAME,
2724 0,
2725 "ZZ",
2726 strlen ("ZZ"));
2727 gnutls_x509_crt_set_dn_by_oid (request,
2728 GNUTLS_OID_X520_ORGANIZATION_NAME,
2729 0,
2730 "GNU Name System",
2731 strlen ("GNU Name System"));
2732 gnutls_x509_crt_set_dn_by_oid (request,
2733 GNUTLS_OID_X520_COMMON_NAME,
2734 0,
2735 name,
2736 strlen (name));
2737 gnutls_x509_crt_set_subject_alternative_name (request,
2738 GNUTLS_SAN_DNSNAME,
2739 name);
2740 GNUNET_break (GNUTLS_E_SUCCESS ==
2741 gnutls_x509_crt_set_version (request,
2742 3));
2743 gnutls_rnd (GNUTLS_RND_NONCE,
2744 &serial,
2745 sizeof(serial));
2746 gnutls_x509_crt_set_serial (request,
2747 &serial,
2748 sizeof(serial));
2749 etime = time (NULL);
2750 tm_data = localtime (&etime);
2751 tm_data->tm_hour--;
2752 etime = mktime (tm_data);
2753 gnutls_x509_crt_set_activation_time (request,
2754 etime);
2755 tm_data->tm_year++;
2756 etime = mktime (tm_data);
2757 gnutls_x509_crt_set_expiration_time (request,
2758 etime);
2759 gnutls_x509_crt_sign2 (request,
2760 proxy_ca.cert,
2761 proxy_ca.key,
2762 GNUTLS_DIG_SHA512,
2763 0);
2764 key_buf_size = sizeof(pgc->key);
2765 cert_buf_size = sizeof(pgc->cert);
2766 gnutls_x509_crt_export (request,
2767 GNUTLS_X509_FMT_PEM,
2768 pgc->cert,
2769 &cert_buf_size);
2770 gnutls_x509_privkey_export (proxy_ca.key,
2771 GNUTLS_X509_FMT_PEM,
2772 pgc->key,
2773 &key_buf_size);
2774 gnutls_x509_crt_deinit (request);
2775 return pgc;
2776}
2777
2778
2779/**
2780 * Function called by MHD with errors, suppresses them all.
2781 *
2782 * @param cls closure
2783 * @param fm format string (`printf()`-style)
2784 * @param ap arguments to @a fm
2785 */
2786static void
2787mhd_error_log_callback (void *cls,
2788 const char *fm,
2789 va_list ap)
2790{
2791 /* do nothing */
2792}
2793
2794
2795/**
2796 * Lookup (or create) an TLS MHD instance for a particular domain.
2797 *
2798 * @param domain the domain the TLS daemon has to serve
2799 * @return NULL on error
2800 */
2801static struct MhdHttpList *
2802lookup_ssl_httpd (const char*domain)
2803{
2804 struct MhdHttpList *hd;
2805 struct ProxyGNSCertificate *pgc;
2806
2807 if (NULL == domain)
2808 {
2809 GNUNET_break (0);
2810 return NULL;
2811 }
2812 for (hd = mhd_httpd_head; NULL != hd; hd = hd->next)
2813 if ((NULL != hd->domain) &&
2814 (0 == strcmp (hd->domain, domain)))
2815 return hd;
2816 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2817 "Starting fresh MHD HTTPS instance for domain `%s'\n",
2818 domain);
2819 pgc = generate_gns_certificate (domain);
2820 hd = GNUNET_new (struct MhdHttpList);
2821 hd->is_ssl = GNUNET_YES;
2822 hd->domain = GNUNET_strdup (domain);
2823 hd->proxy_cert = pgc;
2824 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_SSL
2825 | MHD_USE_NO_LISTEN_SOCKET
2826 | MHD_ALLOW_SUSPEND_RESUME,
2827 0,
2828 NULL, NULL,
2829 &create_response, hd,
2830 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned
2831 int) 16,
2832 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb,
2833 NULL,
2834 MHD_OPTION_NOTIFY_CONNECTION,
2835 &mhd_connection_cb, NULL,
2836 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback,
2837 NULL,
2838 MHD_OPTION_EXTERNAL_LOGGER,
2839 &mhd_error_log_callback, NULL,
2840 MHD_OPTION_HTTPS_MEM_KEY, pgc->key,
2841 MHD_OPTION_HTTPS_MEM_CERT, pgc->cert,
2842 MHD_OPTION_END);
2843 if (NULL == hd->daemon)
2844 {
2845 GNUNET_free (pgc);
2846 GNUNET_free (hd);
2847 return NULL;
2848 }
2849 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
2850 mhd_httpd_tail,
2851 hd);
2852 return hd;
2853}
2854
2855
2856/**
2857 * Task run when a Socks5Request somehow fails to be associated with
2858 * an MHD connection (e.g. because the client never speaks HTTP after
2859 * the SOCKS5 handshake). Clean up.
2860 *
2861 * @param cls the `struct Socks5Request *`
2862 */
2863static void
2864timeout_s5r_handshake (void *cls)
2865{
2866 struct Socks5Request *s5r = cls;
2867
2868 s5r->timeout_task = NULL;
2869 cleanup_s5r (s5r);
2870}
2871
2872
2873/**
2874 * We're done with the Socks5 protocol, now we need to pass the
2875 * connection data through to the final destination, either
2876 * direct (if the protocol might not be HTTP), or via MHD
2877 * (if the port looks like it should be HTTP).
2878 *
2879 * @param s5r socks request that has reached the final stage
2880 */
2881static void
2882setup_data_transfer (struct Socks5Request *s5r)
2883{
2884 struct MhdHttpList *hd;
2885 int fd;
2886 const struct sockaddr *addr;
2887 socklen_t len;
2888 char *domain;
2889
2890 if (GNUNET_YES == s5r->is_tls)
2891 {
2892 GNUNET_asprintf (&domain,
2893 "%s",
2894 s5r->domain);
2895 hd = lookup_ssl_httpd (domain);
2896 if (NULL == hd)
2897 {
2898 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2899 _ ("Failed to start HTTPS server for `%s'\n"),
2900 s5r->domain);
2901 cleanup_s5r (s5r);
2902 GNUNET_free (domain);
2903 return;
2904 }
2905 }
2906 else
2907 {
2908 domain = NULL;
2909 GNUNET_assert (NULL != httpd);
2910 hd = httpd;
2911 }
2912 fd = GNUNET_NETWORK_get_fd (s5r->sock);
2913 addr = GNUNET_NETWORK_get_addr (s5r->sock);
2914 len = GNUNET_NETWORK_get_addrlen (s5r->sock);
2915 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2916 if (MHD_YES !=
2917 MHD_add_connection (hd->daemon,
2918 fd,
2919 addr,
2920 len))
2921 {
2922 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2923 _ ("Failed to pass client to MHD\n"));
2924 cleanup_s5r (s5r);
2925 GNUNET_free (domain);
2926 return;
2927 }
2928 s5r->hd = hd;
2929 schedule_httpd (hd);
2930 s5r->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_HANDSHAKE_TIMEOUT,
2931 &timeout_s5r_handshake,
2932 s5r);
2933 GNUNET_free (domain);
2934}
2935
2936
2937/* ********************* SOCKS handling ************************* */
2938
2939
2940/**
2941 * Write data from buffer to socks5 client, then continue with state machine.
2942 *
2943 * @param cls the closure with the `struct Socks5Request`
2944 */
2945static void
2946do_write (void *cls)
2947{
2948 struct Socks5Request *s5r = cls;
2949 ssize_t len;
2950
2951 s5r->wtask = NULL;
2952 len = GNUNET_NETWORK_socket_send (s5r->sock,
2953 s5r->wbuf,
2954 s5r->wbuf_len);
2955 if (len <= 0)
2956 {
2957 /* write error: connection closed, shutdown, etc.; just clean up */
2958 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2959 "Write Error\n");
2960 cleanup_s5r (s5r);
2961 return;
2962 }
2963 memmove (s5r->wbuf,
2964 &s5r->wbuf[len],
2965 s5r->wbuf_len - len);
2966 s5r->wbuf_len -= len;
2967 if (s5r->wbuf_len > 0)
2968 {
2969 /* not done writing */
2970 s5r->wtask =
2971 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2972 s5r->sock,
2973 &do_write, s5r);
2974 return;
2975 }
2976
2977 /* we're done writing, continue with state machine! */
2978
2979 switch (s5r->state)
2980 {
2981 case SOCKS5_INIT:
2982 GNUNET_assert (0);
2983 break;
2984
2985 case SOCKS5_REQUEST:
2986 GNUNET_assert (NULL != s5r->rtask);
2987 break;
2988
2989 case SOCKS5_DATA_TRANSFER:
2990 setup_data_transfer (s5r);
2991 return;
2992
2993 case SOCKS5_WRITE_THEN_CLEANUP:
2994 cleanup_s5r (s5r);
2995 return;
2996
2997 default:
2998 GNUNET_break (0);
2999 break;
3000 }
3001}
3002
3003
3004/**
3005 * Return a server response message indicating a failure to the client.
3006 *
3007 * @param s5r request to return failure code for
3008 * @param sc status code to return
3009 */
3010static void
3011signal_socks_failure (struct Socks5Request *s5r,
3012 enum Socks5StatusCode sc)
3013{
3014 struct Socks5ServerResponseMessage *s_resp;
3015
3016 GNUNET_break (0 == s5r->wbuf_len); /* Should happen first in any transmission, right? */
3017 GNUNET_assert (SOCKS_BUFFERSIZE - s5r->wbuf_len >=
3018 sizeof(struct Socks5ServerResponseMessage));
3019 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
3020 memset (s_resp, 0, sizeof(struct Socks5ServerResponseMessage));
3021 s_resp->version = SOCKS_VERSION_5;
3022 s_resp->reply = sc;
3023 s5r->state = SOCKS5_WRITE_THEN_CLEANUP;
3024 if (NULL != s5r->wtask)
3025 s5r->wtask =
3026 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
3027 s5r->sock,
3028 &do_write, s5r);
3029}
3030
3031
3032/**
3033 * Return a server response message indicating success.
3034 *
3035 * @param s5r request to return success status message for
3036 */
3037static void
3038signal_socks_success (struct Socks5Request *s5r)
3039{
3040 struct Socks5ServerResponseMessage *s_resp;
3041
3042 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
3043 s_resp->version = SOCKS_VERSION_5;
3044 s_resp->reply = SOCKS5_STATUS_REQUEST_GRANTED;
3045 s_resp->reserved = 0;
3046 s_resp->addr_type = SOCKS5_AT_IPV4;
3047 /* zero out IPv4 address and port */
3048 memset (&s_resp[1],
3049 0,
3050 sizeof(struct in_addr) + sizeof(uint16_t));
3051 s5r->wbuf_len += sizeof(struct Socks5ServerResponseMessage)
3052 + sizeof(struct in_addr) + sizeof(uint16_t);
3053 if (NULL == s5r->wtask)
3054 s5r->wtask =
3055 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
3056 s5r->sock,
3057 &do_write, s5r);
3058}
3059
3060
3061/**
3062 * Process GNS results for target domain.
3063 *
3064 * @param cls the `struct Socks5Request *`
3065 * @param tld #GNUNET_YES if this was a GNS TLD.
3066 * @param rd_count number of records returned
3067 * @param rd record data
3068 */
3069static void
3070handle_gns_result (void *cls,
3071 int tld,
3072 uint32_t rd_count,
3073 const struct GNUNET_GNSRECORD_Data *rd)
3074{
3075 struct Socks5Request *s5r = cls;
3076 const struct GNUNET_GNSRECORD_Data *r;
3077 int got_ip;
3078
3079 s5r->gns_lookup = NULL;
3080 s5r->is_gns = tld;
3081 got_ip = GNUNET_NO;
3082 for (uint32_t i = 0; i < rd_count; i++)
3083 {
3084 r = &rd[i];
3085 switch (r->record_type)
3086 {
3087 case GNUNET_DNSPARSER_TYPE_A:
3088 {
3089 struct sockaddr_in *in;
3090
3091 if (sizeof(struct in_addr) != r->data_size)
3092 {
3093 GNUNET_break_op (0);
3094 break;
3095 }
3096 if (GNUNET_YES == got_ip)
3097 break;
3098 if (GNUNET_OK !=
3099 GNUNET_NETWORK_test_pf (PF_INET))
3100 break;
3101 got_ip = GNUNET_YES;
3102 in = (struct sockaddr_in *) &s5r->destination_address;
3103 in->sin_family = AF_INET;
3104 GNUNET_memcpy (&in->sin_addr,
3105 r->data,
3106 r->data_size);
3107 in->sin_port = htons (s5r->port);
3108#if HAVE_SOCKADDR_IN_SIN_LEN
3109 in->sin_len = sizeof(*in);
3110#endif
3111 }
3112 break;
3113
3114 case GNUNET_DNSPARSER_TYPE_AAAA:
3115 {
3116 struct sockaddr_in6 *in;
3117
3118 if (sizeof(struct in6_addr) != r->data_size)
3119 {
3120 GNUNET_break_op (0);
3121 break;
3122 }
3123 if (GNUNET_YES == got_ip)
3124 break;
3125 if (GNUNET_YES == disable_v6)
3126 break;
3127 if (GNUNET_OK !=
3128 GNUNET_NETWORK_test_pf (PF_INET6))
3129 break;
3130 /* FIXME: allow user to disable IPv6 per configuration option... */
3131 got_ip = GNUNET_YES;
3132 in = (struct sockaddr_in6 *) &s5r->destination_address;
3133 in->sin6_family = AF_INET6;
3134 GNUNET_memcpy (&in->sin6_addr,
3135 r->data,
3136 r->data_size);
3137 in->sin6_port = htons (s5r->port);
3138#if HAVE_SOCKADDR_IN_SIN_LEN
3139 in->sin6_len = sizeof(*in);
3140#endif
3141 }
3142 break;
3143
3144 case GNUNET_GNSRECORD_TYPE_VPN:
3145 GNUNET_break (0); /* should have been translated within GNS */
3146 break;
3147
3148 case GNUNET_GNSRECORD_TYPE_LEHO:
3149 GNUNET_free (s5r->leho);
3150 s5r->leho = GNUNET_strndup (r->data,
3151 r->data_size);
3152 break;
3153
3154 case GNUNET_GNSRECORD_TYPE_BOX:
3155 {
3156 const struct GNUNET_GNSRECORD_BoxRecord *box;
3157
3158 if (r->data_size < sizeof(struct GNUNET_GNSRECORD_BoxRecord))
3159 {
3160 GNUNET_break_op (0);
3161 break;
3162 }
3163 box = r->data;
3164 if ((ntohl (box->record_type) != GNUNET_DNSPARSER_TYPE_TLSA) ||
3165 (ntohs (box->protocol) != IPPROTO_TCP) ||
3166 (ntohs (box->service) != s5r->port))
3167 break; /* BOX record does not apply */
3168 if (s5r->num_danes >= MAX_DANES)
3169 {
3170 GNUNET_break (0); /* MAX_DANES too small */
3171 break;
3172 }
3173 s5r->is_tls = GNUNET_YES; /* This should be TLS */
3174 s5r->dane_data_len[s5r->num_danes]
3175 = r->data_size - sizeof(struct GNUNET_GNSRECORD_BoxRecord);
3176 s5r->dane_data[s5r->num_danes]
3177 = GNUNET_memdup (&box[1],
3178 s5r->dane_data_len[s5r->num_danes]);
3179 s5r->num_danes++;
3180 break;
3181 }
3182
3183 default:
3184 /* don't care */
3185 break;
3186 }
3187 }
3188 if ((GNUNET_YES != got_ip) &&
3189 (GNUNET_YES == tld))
3190 {
3191 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3192 "Name resolution failed to yield useful IP address.\n");
3193 signal_socks_failure (s5r,
3194 SOCKS5_STATUS_GENERAL_FAILURE);
3195 return;
3196 }
3197 s5r->state = SOCKS5_DATA_TRANSFER;
3198 signal_socks_success (s5r);
3199}
3200
3201
3202/**
3203 * Remove the first @a len bytes from the beginning of the read buffer.
3204 *
3205 * @param s5r the handle clear the read buffer for
3206 * @param len number of bytes in read buffer to advance
3207 */
3208static void
3209clear_from_s5r_rbuf (struct Socks5Request *s5r,
3210 size_t len)
3211{
3212 GNUNET_assert (len <= s5r->rbuf_len);
3213 memmove (s5r->rbuf,
3214 &s5r->rbuf[len],
3215 s5r->rbuf_len - len);
3216 s5r->rbuf_len -= len;
3217}
3218
3219
3220/**
3221 * Read data from incoming Socks5 connection
3222 *
3223 * @param cls the closure with the `struct Socks5Request`
3224 */
3225static void
3226do_s5r_read (void *cls)
3227{
3228 struct Socks5Request *s5r = cls;
3229 const struct Socks5ClientHelloMessage *c_hello;
3230 struct Socks5ServerHelloMessage *s_hello;
3231 const struct Socks5ClientRequestMessage *c_req;
3232 ssize_t rlen;
3233 size_t alen;
3234 const struct GNUNET_SCHEDULER_TaskContext *tc;
3235
3236 s5r->rtask = NULL;
3237 tc = GNUNET_SCHEDULER_get_task_context ();
3238 if ((NULL != tc->read_ready) &&
3239 (GNUNET_NETWORK_fdset_isset (tc->read_ready,
3240 s5r->sock)))
3241 {
3242 rlen = GNUNET_NETWORK_socket_recv (s5r->sock,
3243 &s5r->rbuf[s5r->rbuf_len],
3244 sizeof(s5r->rbuf) - s5r->rbuf_len);
3245 if (rlen <= 0)
3246 {
3247 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3248 "socks5 client disconnected.\n");
3249 cleanup_s5r (s5r);
3250 return;
3251 }
3252 s5r->rbuf_len += rlen;
3253 }
3254 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3255 s5r->sock,
3256 &do_s5r_read, s5r);
3257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3258 "Processing %zu bytes of socks data in state %d\n",
3259 s5r->rbuf_len,
3260 s5r->state);
3261 switch (s5r->state)
3262 {
3263 case SOCKS5_INIT:
3264 c_hello = (const struct Socks5ClientHelloMessage*) &s5r->rbuf;
3265 if ((s5r->rbuf_len < sizeof(struct Socks5ClientHelloMessage)) ||
3266 (s5r->rbuf_len < sizeof(struct Socks5ClientHelloMessage)
3267 + c_hello->num_auth_methods))
3268 return; /* need more data */
3269 if (SOCKS_VERSION_5 != c_hello->version)
3270 {
3271 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3272 _ ("Unsupported socks version %d\n"),
3273 (int) c_hello->version);
3274 cleanup_s5r (s5r);
3275 return;
3276 }
3277 clear_from_s5r_rbuf (s5r,
3278 sizeof(struct Socks5ClientHelloMessage)
3279 + c_hello->num_auth_methods);
3280 GNUNET_assert (0 == s5r->wbuf_len);
3281 s_hello = (struct Socks5ServerHelloMessage *) &s5r->wbuf;
3282 s5r->wbuf_len = sizeof(struct Socks5ServerHelloMessage);
3283 s_hello->version = SOCKS_VERSION_5;
3284 s_hello->auth_method = SOCKS_AUTH_NONE;
3285 GNUNET_assert (NULL == s5r->wtask);
3286 s5r->wtask = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
3287 s5r->sock,
3288 &do_write, s5r);
3289 s5r->state = SOCKS5_REQUEST;
3290 return;
3291
3292 case SOCKS5_REQUEST:
3293 c_req = (const struct Socks5ClientRequestMessage *) &s5r->rbuf;
3294 if (s5r->rbuf_len < sizeof(struct Socks5ClientRequestMessage))
3295 return;
3296 switch (c_req->command)
3297 {
3298 case SOCKS5_CMD_TCP_STREAM:
3299 /* handled below */
3300 break;
3301
3302 default:
3303 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3304 _ ("Unsupported socks command %d\n"),
3305 (int) c_req->command);
3306 signal_socks_failure (s5r,
3307 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED);
3308 return;
3309 }
3310 switch (c_req->addr_type)
3311 {
3312 case SOCKS5_AT_IPV4:
3313 {
3314 const struct in_addr *v4 = (const struct in_addr *) &c_req[1];
3315 const uint16_t *port = (const uint16_t *) &v4[1];
3316 struct sockaddr_in *in;
3317
3318 s5r->port = ntohs (*port);
3319 alen = sizeof(struct in_addr);
3320 if (s5r->rbuf_len < sizeof(struct Socks5ClientRequestMessage)
3321 + alen + sizeof(uint16_t))
3322 return; /* need more data */
3323 in = (struct sockaddr_in *) &s5r->destination_address;
3324 in->sin_family = AF_INET;
3325 in->sin_addr = *v4;
3326 in->sin_port = *port;
3327#if HAVE_SOCKADDR_IN_SIN_LEN
3328 in->sin_len = sizeof(*in);
3329#endif
3330 s5r->state = SOCKS5_DATA_TRANSFER;
3331 }
3332 break;
3333
3334 case SOCKS5_AT_IPV6:
3335 {
3336 const struct in6_addr *v6 = (const struct in6_addr *) &c_req[1];
3337 const uint16_t *port = (const uint16_t *) &v6[1];
3338 struct sockaddr_in6 *in;
3339
3340 s5r->port = ntohs (*port);
3341 alen = sizeof(struct in6_addr);
3342 if (s5r->rbuf_len < sizeof(struct Socks5ClientRequestMessage)
3343 + alen + sizeof(uint16_t))
3344 return; /* need more data */
3345 in = (struct sockaddr_in6 *) &s5r->destination_address;
3346 in->sin6_family = AF_INET6;
3347 in->sin6_addr = *v6;
3348 in->sin6_port = *port;
3349#if HAVE_SOCKADDR_IN_SIN_LEN
3350 in->sin6_len = sizeof(*in);
3351#endif
3352 s5r->state = SOCKS5_DATA_TRANSFER;
3353 }
3354 break;
3355
3356 case SOCKS5_AT_DOMAINNAME:
3357 {
3358 const uint8_t *dom_len;
3359 const char *dom_name;
3360 const uint16_t *port;
3361
3362 dom_len = (const uint8_t *) &c_req[1];
3363 alen = *dom_len + 1;
3364 if (s5r->rbuf_len < sizeof(struct Socks5ClientRequestMessage)
3365 + alen + sizeof(uint16_t))
3366 return; /* need more data */
3367 dom_name = (const char *) &dom_len[1];
3368 port = (const uint16_t *) &dom_name[*dom_len];
3369 s5r->domain = GNUNET_strndup (dom_name,
3370 *dom_len);
3371 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3372 "Requested connection is to %s:%d\n",
3373 // (HTTPS_PORT == s5r->port) ? "s" : "",
3374 s5r->domain,
3375 ntohs (*port));
3376 s5r->state = SOCKS5_RESOLVING;
3377 s5r->port = ntohs (*port);
3378 s5r->is_tls = (HTTPS_PORT == s5r->port) ? GNUNET_YES : GNUNET_NO;
3379 s5r->gns_lookup = GNUNET_GNS_lookup_with_tld (gns_handle,
3380 s5r->domain,
3381 GNUNET_DNSPARSER_TYPE_A,
3382 GNUNET_GNS_LO_LOCAL_MASTER /* only cached */,
3383 &handle_gns_result,
3384 s5r);
3385 break;
3386 }
3387
3388 default:
3389 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3390 _ ("Unsupported socks address type %d\n"),
3391 (int) c_req->addr_type);
3392 signal_socks_failure (s5r,
3393 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED);
3394 return;
3395 }
3396 clear_from_s5r_rbuf (s5r,
3397 sizeof(struct Socks5ClientRequestMessage)
3398 + alen + sizeof(uint16_t));
3399 if (0 != s5r->rbuf_len)
3400 {
3401 /* read more bytes than healthy, why did the client send more!? */
3402 GNUNET_break_op (0);
3403 signal_socks_failure (s5r,
3404 SOCKS5_STATUS_GENERAL_FAILURE);
3405 return;
3406 }
3407 if (SOCKS5_DATA_TRANSFER == s5r->state)
3408 {
3409 /* if we are not waiting for GNS resolution, signal success */
3410 signal_socks_success (s5r);
3411 }
3412 /* We are done reading right now */
3413 GNUNET_SCHEDULER_cancel (s5r->rtask);
3414 s5r->rtask = NULL;
3415 return;
3416
3417 case SOCKS5_RESOLVING:
3418 GNUNET_assert (0);
3419 return;
3420
3421 case SOCKS5_DATA_TRANSFER:
3422 GNUNET_assert (0);
3423 return;
3424
3425 default:
3426 GNUNET_assert (0);
3427 return;
3428 }
3429}
3430
3431
3432/**
3433 * Accept new incoming connections
3434 *
3435 * @param cls the closure with the lsock4 or lsock6
3436 * @param tc the scheduler context
3437 */
3438static void
3439do_accept (void *cls)
3440{
3441 struct GNUNET_NETWORK_Handle *lsock = cls;
3442 struct GNUNET_NETWORK_Handle *s;
3443 struct Socks5Request *s5r;
3444
3445 GNUNET_assert (NULL != lsock);
3446 if (lsock == lsock4)
3447 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3448 lsock,
3449 &do_accept,
3450 lsock);
3451 else if (lsock == lsock6)
3452 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3453 lsock,
3454 &do_accept,
3455 lsock);
3456 else
3457 GNUNET_assert (0);
3458 s = GNUNET_NETWORK_socket_accept (lsock,
3459 NULL,
3460 NULL);
3461 if (NULL == s)
3462 {
3463 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3464 "accept");
3465 return;
3466 }
3467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3468 "Got an inbound connection, waiting for data\n");
3469 s5r = GNUNET_new (struct Socks5Request);
3470 GNUNET_CONTAINER_DLL_insert (s5r_head,
3471 s5r_tail,
3472 s5r);
3473 s5r->sock = s;
3474 s5r->state = SOCKS5_INIT;
3475 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3476 s5r->sock,
3477 &do_s5r_read,
3478 s5r);
3479}
3480
3481
3482/* ******************* General / main code ********************* */
3483
3484
3485/**
3486 * Task run on shutdown
3487 *
3488 * @param cls closure
3489 */
3490static void
3491do_shutdown (void *cls)
3492{
3493 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3494 "Shutting down...\n");
3495 /* MHD requires resuming before destroying the daemons */
3496 for (struct Socks5Request *s5r = s5r_head;
3497 NULL != s5r;
3498 s5r = s5r->next)
3499 {
3500 if (s5r->suspended)
3501 {
3502 s5r->suspended = GNUNET_NO;
3503 MHD_resume_connection (s5r->con);
3504 }
3505 }
3506 while (NULL != mhd_httpd_head)
3507 kill_httpd (mhd_httpd_head);
3508 while (NULL != s5r_head)
3509 cleanup_s5r (s5r_head);
3510 if (NULL != lsock4)
3511 {
3512 GNUNET_NETWORK_socket_close (lsock4);
3513 lsock4 = NULL;
3514 }
3515 if (NULL != lsock6)
3516 {
3517 GNUNET_NETWORK_socket_close (lsock6);
3518 lsock6 = NULL;
3519 }
3520 if (NULL != curl_multi)
3521 {
3522 curl_multi_cleanup (curl_multi);
3523 curl_multi = NULL;
3524 }
3525 if (NULL != gns_handle)
3526 {
3527 GNUNET_GNS_disconnect (gns_handle);
3528 gns_handle = NULL;
3529 }
3530 if (NULL != curl_download_task)
3531 {
3532 GNUNET_SCHEDULER_cancel (curl_download_task);
3533 curl_download_task = NULL;
3534 }
3535 if (NULL != ltask4)
3536 {
3537 GNUNET_SCHEDULER_cancel (ltask4);
3538 ltask4 = NULL;
3539 }
3540 if (NULL != ltask6)
3541 {
3542 GNUNET_SCHEDULER_cancel (ltask6);
3543 ltask6 = NULL;
3544 }
3545 gnutls_x509_crt_deinit (proxy_ca.cert);
3546 gnutls_x509_privkey_deinit (proxy_ca.key);
3547 gnutls_global_deinit ();
3548}
3549
3550
3551/**
3552 * Create an IPv4 listen socket bound to our port.
3553 *
3554 * @return NULL on error
3555 */
3556static struct GNUNET_NETWORK_Handle *
3557bind_v4 ()
3558{
3559 struct GNUNET_NETWORK_Handle *ls;
3560 struct sockaddr_in sa4;
3561 int eno;
3562
3563 memset (&sa4, 0, sizeof(sa4));
3564 sa4.sin_family = AF_INET;
3565 sa4.sin_port = htons (port);
3566 sa4.sin_addr.s_addr = address;
3567#if HAVE_SOCKADDR_IN_SIN_LEN
3568 sa4.sin_len = sizeof(sa4);
3569#endif
3570 ls = GNUNET_NETWORK_socket_create (AF_INET,
3571 SOCK_STREAM,
3572 0);
3573 if (NULL == ls)
3574 return NULL;
3575 if (GNUNET_OK !=
3576 GNUNET_NETWORK_socket_bind (ls,
3577 (const struct sockaddr *) &sa4,
3578 sizeof(sa4)))
3579 {
3580 eno = errno;
3581 GNUNET_NETWORK_socket_close (ls);
3582 errno = eno;
3583 return NULL;
3584 }
3585 return ls;
3586}
3587
3588
3589/**
3590 * Create an IPv6 listen socket bound to our port.
3591 *
3592 * @return NULL on error
3593 */
3594static struct GNUNET_NETWORK_Handle *
3595bind_v6 ()
3596{
3597 struct GNUNET_NETWORK_Handle *ls;
3598 struct sockaddr_in6 sa6;
3599 int eno;
3600
3601 memset (&sa6, 0, sizeof(sa6));
3602 sa6.sin6_family = AF_INET6;
3603 sa6.sin6_port = htons (port);
3604 sa6.sin6_addr = address6;
3605#if HAVE_SOCKADDR_IN_SIN_LEN
3606 sa6.sin6_len = sizeof(sa6);
3607#endif
3608 ls = GNUNET_NETWORK_socket_create (AF_INET6,
3609 SOCK_STREAM,
3610 0);
3611 if (NULL == ls)
3612 return NULL;
3613 if (GNUNET_OK !=
3614 GNUNET_NETWORK_socket_bind (ls,
3615 (const struct sockaddr *) &sa6,
3616 sizeof(sa6)))
3617 {
3618 eno = errno;
3619 GNUNET_NETWORK_socket_close (ls);
3620 errno = eno;
3621 return NULL;
3622 }
3623 return ls;
3624}
3625
3626
3627/**
3628 * Main function that will be run
3629 *
3630 * @param cls closure
3631 * @param args remaining command-line arguments
3632 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
3633 * @param c configuration
3634 */
3635static void
3636run (void *cls,
3637 char *const *args,
3638 const char *cfgfile,
3639 const struct GNUNET_CONFIGURATION_Handle *c)
3640{
3641 char*cafile_cfg = NULL;
3642 char*cafile;
3643 char*addr_str;
3644 struct MhdHttpList *hd;
3645
3646 cfg = c;
3647
3648 /* Get address to bind to */
3649 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg, "gns-proxy",
3650 "BIND_TO",
3651 &addr_str))
3652 {
3653 // No address specified
3654 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3655 "Don't know what to bind to...\n");
3656 GNUNET_free (addr_str);
3657 GNUNET_SCHEDULER_shutdown ();
3658 return;
3659 }
3660 if (1 != inet_pton (AF_INET, addr_str, &address))
3661 {
3662 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3663 "Unable to parse address %s\n",
3664 addr_str);
3665 GNUNET_free (addr_str);
3666 GNUNET_SCHEDULER_shutdown ();
3667 return;
3668 }
3669 GNUNET_free (addr_str);
3670 /* Get address to bind to */
3671 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg, "gns-proxy",
3672 "BIND_TO6",
3673 &addr_str))
3674 {
3675 // No address specified
3676 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3677 "Don't know what to bind6 to...\n");
3678 GNUNET_free (addr_str);
3679 GNUNET_SCHEDULER_shutdown ();
3680 return;
3681 }
3682 if (1 != inet_pton (AF_INET6, addr_str, &address6))
3683 {
3684 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3685 "Unable to parse IPv6 address %s\n",
3686 addr_str);
3687 GNUNET_free (addr_str);
3688 GNUNET_SCHEDULER_shutdown ();
3689 return;
3690 }
3691 GNUNET_free (addr_str);
3692
3693 if (NULL == (curl_multi = curl_multi_init ()))
3694 {
3695 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3696 "Failed to create cURL multi handle!\n");
3697 return;
3698 }
3699 cafile = cafile_opt;
3700 if (NULL == cafile)
3701 {
3702 if (GNUNET_OK !=
3703 GNUNET_CONFIGURATION_get_value_filename (cfg,
3704 "gns-proxy",
3705 "PROXY_CACERT",
3706 &cafile_cfg))
3707 {
3708 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
3709 "gns-proxy",
3710 "PROXY_CACERT");
3711 return;
3712 }
3713 cafile = cafile_cfg;
3714 }
3715 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3716 "Using `%s' as CA\n",
3717 cafile);
3718
3719 gnutls_global_init ();
3720 gnutls_x509_crt_init (&proxy_ca.cert);
3721 gnutls_x509_privkey_init (&proxy_ca.key);
3722
3723 if ((GNUNET_OK !=
3724 load_cert_from_file (proxy_ca.cert,
3725 cafile)) ||
3726 (GNUNET_OK !=
3727 load_key_from_file (proxy_ca.key,
3728 cafile)))
3729 {
3730 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3731 _ ("Failed to load X.509 key and certificate from `%s'\n"),
3732 cafile);
3733 gnutls_x509_crt_deinit (proxy_ca.cert);
3734 gnutls_x509_privkey_deinit (proxy_ca.key);
3735 gnutls_global_deinit ();
3736 GNUNET_free (cafile_cfg);
3737 return;
3738 }
3739 GNUNET_free (cafile_cfg);
3740 if (NULL == (gns_handle = GNUNET_GNS_connect (cfg)))
3741 {
3742 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3743 "Unable to connect to GNS!\n");
3744 gnutls_x509_crt_deinit (proxy_ca.cert);
3745 gnutls_x509_privkey_deinit (proxy_ca.key);
3746 gnutls_global_deinit ();
3747 return;
3748 }
3749 GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
3750 NULL);
3751
3752 /* Open listen socket for socks proxy */
3753 lsock6 = bind_v6 ();
3754 if (NULL == lsock6)
3755 {
3756 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3757 "bind");
3758 }
3759 else
3760 {
3761 if (GNUNET_OK !=
3762 GNUNET_NETWORK_socket_listen (lsock6,
3763 5))
3764 {
3765 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3766 "listen");
3767 GNUNET_NETWORK_socket_close (lsock6);
3768 lsock6 = NULL;
3769 }
3770 else
3771 {
3772 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3773 lsock6,
3774 &do_accept,
3775 lsock6);
3776 }
3777 }
3778 lsock4 = bind_v4 ();
3779 if (NULL == lsock4)
3780 {
3781 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3782 "bind");
3783 }
3784 else
3785 {
3786 if (GNUNET_OK !=
3787 GNUNET_NETWORK_socket_listen (lsock4,
3788 5))
3789 {
3790 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3791 "listen");
3792 GNUNET_NETWORK_socket_close (lsock4);
3793 lsock4 = NULL;
3794 }
3795 else
3796 {
3797 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3798 lsock4,
3799 &do_accept,
3800 lsock4);
3801 }
3802 }
3803 if ((NULL == lsock4) &&
3804 (NULL == lsock6))
3805 {
3806 GNUNET_SCHEDULER_shutdown ();
3807 return;
3808 }
3809 if (0 != curl_global_init (CURL_GLOBAL_WIN32))
3810 {
3811 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3812 "cURL global init failed!\n");
3813 GNUNET_SCHEDULER_shutdown ();
3814 return;
3815 }
3816 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3817 "Proxy listens on port %u\n",
3818 (unsigned int) port);
3819
3820 /* start MHD daemon for HTTP */
3821 hd = GNUNET_new (struct MhdHttpList);
3822 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_NO_LISTEN_SOCKET
3823 | MHD_ALLOW_SUSPEND_RESUME,
3824 0,
3825 NULL, NULL,
3826 &create_response, hd,
3827 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned
3828 int) 16,
3829 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb,
3830 NULL,
3831 MHD_OPTION_NOTIFY_CONNECTION,
3832 &mhd_connection_cb, NULL,
3833 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback,
3834 NULL,
3835 MHD_OPTION_END);
3836 if (NULL == hd->daemon)
3837 {
3838 GNUNET_free (hd);
3839 GNUNET_SCHEDULER_shutdown ();
3840 return;
3841 }
3842 httpd = hd;
3843 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
3844 mhd_httpd_tail,
3845 hd);
3846}
3847
3848
3849/**
3850 * The main function for gnunet-gns-proxy.
3851 *
3852 * @param argc number of arguments from the command line
3853 * @param argv command line arguments
3854 * @return 0 ok, 1 on error
3855 */
3856int
3857main (int argc,
3858 char *const *argv)
3859{
3860 struct GNUNET_GETOPT_CommandLineOption options[] = {
3861 GNUNET_GETOPT_option_uint16 ('p',
3862 "port",
3863 NULL,
3864 gettext_noop (
3865 "listen on specified port (default: 7777)"),
3866 &port),
3867 GNUNET_GETOPT_option_string ('a',
3868 "authority",
3869 NULL,
3870 gettext_noop ("pem file to use as CA"),
3871 &cafile_opt),
3872 GNUNET_GETOPT_option_flag ('6',
3873 "disable-ivp6",
3874 gettext_noop ("disable use of IPv6"),
3875 &disable_v6),
3876
3877 GNUNET_GETOPT_OPTION_END
3878 };
3879 static const char*page =
3880 "<html><head><title>gnunet-gns-proxy</title>"
3881 "</head><body>cURL fail</body></html>";
3882 int ret;
3883
3884 if (GNUNET_OK !=
3885 GNUNET_STRINGS_get_utf8_args (argc, argv,
3886 &argc, &argv))
3887 return 2;
3888 GNUNET_log_setup ("gnunet-gns-proxy",
3889 "WARNING",
3890 NULL);
3891 curl_failure_response
3892 = MHD_create_response_from_buffer (strlen (page),
3893 (void *) page,
3894 MHD_RESPMEM_PERSISTENT);
3895
3896 ret =
3897 (GNUNET_OK ==
3898 GNUNET_PROGRAM_run (argc, argv,
3899 "gnunet-gns-proxy",
3900 _ ("GNUnet GNS proxy"),
3901 options,
3902 &run, NULL)) ? 0 : 1;
3903 MHD_destroy_response (curl_failure_response);
3904 GNUNET_free_nz ((char *) argv);
3905 return ret;
3906}
3907
3908
3909/* end of gnunet-gns-proxy.c */