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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_SSL_PTR,
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 hdr_val[offset] = '\0';
1234 }
1235
1236 new_location = NULL;
1237 if (0 == strcasecmp (MHD_HTTP_HEADER_TRANSFER_ENCODING,
1238 hdr_type))
1239 {
1240 /* Ignore transfer encoding, set automatically by MHD if required */
1241 goto cleanup;
1242 }
1243 if ((0 == strcasecmp (MHD_HTTP_HEADER_LOCATION,
1244 hdr_type)))
1245 {
1246 char *leho_host;
1247
1248 GNUNET_asprintf (&leho_host,
1249 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1250 ? "http://%s"
1251 : "https://%s",
1252 s5r->leho);
1253 if (0 == strncmp (leho_host,
1254 hdr_val,
1255 strlen (leho_host)))
1256 {
1257 GNUNET_asprintf (&new_location,
1258 "%s%s%s",
1259 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1260 ? "http://"
1261 : "https://",
1262 s5r->domain,
1263 hdr_val + strlen (leho_host));
1264 hdr_val = new_location;
1265 }
1266 GNUNET_free (leho_host);
1267 }
1268 else if (0 == strcasecmp (MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN,
1269 hdr_type))
1270 {
1271 char *leho_host;
1272
1273 GNUNET_asprintf (&leho_host,
1274 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1275 ? "http://%s"
1276 : "https://%s",
1277 s5r->leho);
1278 if (0 == strncmp (leho_host,
1279 hdr_val,
1280 strlen (leho_host)))
1281 {
1282 GNUNET_asprintf (&new_location,
1283 "%s%s",
1284 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1285 ? "http://"
1286 : "https://",
1287 s5r->domain);
1288 hdr_val = new_location;
1289 }
1290 GNUNET_free (leho_host);
1291 }
1292
1293 /* MHD does not allow certain characters in values, remove those */
1294 if (NULL != (tok = strchr (hdr_val, '\n')))
1295 *tok = '\0';
1296 if (NULL != (tok = strchr (hdr_val, '\r')))
1297 *tok = '\0';
1298 if (NULL != (tok = strchr (hdr_val, '\t')))
1299 *tok = '\0';
1300 if (0 != strlen (hdr_val)) /* Rely in MHD to set those */
1301 {
1302 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1303 "Adding header %s: %s to MHD response\n",
1304 hdr_type,
1305 hdr_val);
1306 header = GNUNET_new (struct HttpResponseHeader);
1307 header->type = GNUNET_strdup (hdr_type);
1308 header->value = GNUNET_strdup (hdr_val);
1309 GNUNET_CONTAINER_DLL_insert (s5r->header_head,
1310 s5r->header_tail,
1311 header);
1312 }
1313 cleanup:
1314 GNUNET_free (ndup);
1315 GNUNET_free (new_cookie_hdr);
1316 GNUNET_free (new_location);
1317 return bytes;
1318}
1319
1320
1321/**
1322 * Create an MHD response object in @a s5r matching the
1323 * information we got from curl.
1324 *
1325 * @param s5r the request for which we convert the response
1326 * @return #GNUNET_OK on success, #GNUNET_SYSERR if response was
1327 * already initialized before
1328 */
1329static int
1330create_mhd_response_from_s5r (struct Socks5Request *s5r)
1331{
1332 long resp_code;
1333 double content_length;
1334
1335 if (NULL != s5r->response)
1336 {
1337 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1338 "Response already set!\n");
1339 return GNUNET_SYSERR;
1340 }
1341
1342 GNUNET_break (CURLE_OK ==
1343 curl_easy_getinfo (s5r->curl,
1344 CURLINFO_RESPONSE_CODE,
1345 &resp_code));
1346 GNUNET_break (CURLE_OK ==
1347 curl_easy_getinfo (s5r->curl,
1348 CURLINFO_CONTENT_LENGTH_DOWNLOAD_T,
1349 &content_length));
1350 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1351 "Creating MHD response with code %d and size %d for %s%s\n",
1352 (int) resp_code,
1353 (int) content_length,
1354 s5r->domain,
1355 s5r->url);
1356 s5r->response_code = resp_code;
1357 s5r->response = MHD_create_response_from_callback ((-1 == content_length)
1358 ? MHD_SIZE_UNKNOWN
1359 : content_length,
1360 IO_BUFFERSIZE,
1361 &mhd_content_cb,
1362 s5r,
1363 NULL);
1364 for (struct HttpResponseHeader *header = s5r->header_head;
1365 NULL != header;
1366 header = header->next)
1367 {
1368 if (0 == strcasecmp (header->type,
1369 MHD_HTTP_HEADER_CONTENT_LENGTH))
1370 continue; /* MHD won't let us mess with those, for good reason */
1371 if ((0 == strcasecmp (header->type,
1372 MHD_HTTP_HEADER_TRANSFER_ENCODING)) &&
1373 ((0 == strcasecmp (header->value,
1374 "identity")) ||
1375 (0 == strcasecmp (header->value,
1376 "chunked"))))
1377 continue; /* MHD won't let us mess with those, for good reason */
1378 if (MHD_YES !=
1379 MHD_add_response_header (s5r->response,
1380 header->type,
1381 header->value))
1382 {
1383 GNUNET_break (0);
1384 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1385 "Failed to add header `%s:%s'\n",
1386 header->type,
1387 header->value);
1388 }
1389 }
1390 /* force connection to be closed after each request, as we
1391 do not support HTTP pipelining (yet, FIXME!) */
1392 /*GNUNET_break (MHD_YES ==
1393 MHD_add_response_header (s5r->response,
1394 MHD_HTTP_HEADER_CONNECTION,
1395 "close"));*/
1396 MHD_resume_connection (s5r->con);
1397 s5r->suspended = GNUNET_NO;
1398 return GNUNET_OK;
1399}
1400
1401
1402/**
1403 * Handle response payload data from cURL. Copies it into our `io_buf` to make
1404 * it available to MHD.
1405 *
1406 * @param ptr pointer to the data
1407 * @param size number of blocks of data
1408 * @param nmemb blocksize
1409 * @param ctx our `struct Socks5Request *`
1410 * @return number of bytes handled
1411 */
1412static size_t
1413curl_download_cb (void *ptr,
1414 size_t size,
1415 size_t nmemb,
1416 void*ctx)
1417{
1418 struct Socks5Request *s5r = ctx;
1419 size_t total = size * nmemb;
1420
1421 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1422 "Receiving %ux%u bytes for `%s%s' from cURL to download\n",
1423 (unsigned int) size,
1424 (unsigned int) nmemb,
1425 s5r->domain,
1426 s5r->url);
1427 if (NULL == s5r->response)
1428 GNUNET_assert (GNUNET_OK ==
1429 create_mhd_response_from_s5r (s5r));
1430 if ((SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) &&
1431 (0 == s5r->io_len))
1432 {
1433 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1434 "Previous upload finished... starting DOWNLOAD.\n");
1435 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1436 }
1437 if ((SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
1438 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state))
1439 {
1440 /* we're still not done with the upload, do not yet
1441 start the download, the IO buffer is still full
1442 with upload data. */
1443 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1444 "Pausing CURL download `%s%s', waiting for UPLOAD to finish\n",
1445 s5r->domain,
1446 s5r->url);
1447 s5r->curl_paused = GNUNET_YES;
1448 return CURL_WRITEFUNC_PAUSE; /* not yet ready for data download */
1449 }
1450 if (sizeof(s5r->io_buf) - s5r->io_len < total)
1451 {
1452 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1453 "Pausing CURL `%s%s' download, not enough space %llu %llu %llu\n",
1454 s5r->domain,
1455 s5r->url,
1456 (unsigned long long) sizeof(s5r->io_buf),
1457 (unsigned long long) s5r->io_len,
1458 (unsigned long long) total);
1459 s5r->curl_paused = GNUNET_YES;
1460 return CURL_WRITEFUNC_PAUSE; /* not enough space */
1461 }
1462 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
1463 ptr,
1464 total);
1465 s5r->io_len += total;
1466 if (GNUNET_YES == s5r->suspended)
1467 {
1468 MHD_resume_connection (s5r->con);
1469 s5r->suspended = GNUNET_NO;
1470 }
1471 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1472 "Received %llu bytes of payload via cURL from %s\n",
1473 (unsigned long long) total,
1474 s5r->domain);
1475 if (s5r->io_len == total)
1476 run_mhd_now (s5r->hd);
1477 return total;
1478}
1479
1480
1481/**
1482 * cURL callback for uploaded (PUT/POST) data. Copies it into our `io_buf`
1483 * to make it available to MHD.
1484 *
1485 * @param buf where to write the data
1486 * @param size number of bytes per member
1487 * @param nmemb number of members available in @a buf
1488 * @param cls our `struct Socks5Request` that generated the data
1489 * @return number of bytes copied to @a buf
1490 */
1491static size_t
1492curl_upload_cb (void *buf,
1493 size_t size,
1494 size_t nmemb,
1495 void *cls)
1496{
1497 struct Socks5Request *s5r = cls;
1498 size_t len = size * nmemb;
1499 size_t to_copy;
1500
1501 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1502 "Receiving %ux%u bytes for `%s%s' from cURL to upload\n",
1503 (unsigned int) size,
1504 (unsigned int) nmemb,
1505 s5r->domain,
1506 s5r->url);
1507
1508 if ((0 == s5r->io_len) &&
1509 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state))
1510 {
1511 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1512 "Pausing CURL UPLOAD %s%s, need more data\n",
1513 s5r->domain,
1514 s5r->url);
1515 return CURL_READFUNC_PAUSE;
1516 }
1517 if ((0 == s5r->io_len) &&
1518 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state))
1519 {
1520 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1521 if (GNUNET_YES == s5r->curl_paused)
1522 {
1523 s5r->curl_paused = GNUNET_NO;
1524 curl_easy_pause (s5r->curl,
1525 CURLPAUSE_CONT);
1526 }
1527 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1528 "Completed CURL UPLOAD %s%s\n",
1529 s5r->domain,
1530 s5r->url);
1531 return 0; /* upload finished, can now download */
1532 }
1533 if ((SOCKS5_SOCKET_UPLOAD_STARTED != s5r->state) &&
1534 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state))
1535 {
1536 GNUNET_break (0);
1537 return CURL_READFUNC_ABORT;
1538 }
1539 to_copy = GNUNET_MIN (s5r->io_len,
1540 len);
1541 GNUNET_memcpy (buf,
1542 s5r->io_buf,
1543 to_copy);
1544 memmove (s5r->io_buf,
1545 &s5r->io_buf[to_copy],
1546 s5r->io_len - to_copy);
1547 s5r->io_len -= to_copy;
1548 if (s5r->io_len + to_copy == sizeof(s5r->io_buf))
1549 run_mhd_now (s5r->hd); /* got more space for upload now */
1550 return to_copy;
1551}
1552
1553
1554/* ************************** main loop of cURL interaction ****************** */
1555
1556
1557/**
1558 * Task that is run when we are ready to receive more data
1559 * from curl
1560 *
1561 * @param cls closure
1562 */
1563static void
1564curl_task_download (void *cls);
1565
1566
1567/**
1568 * Ask cURL for the select() sets and schedule cURL operations.
1569 */
1570static void
1571curl_download_prepare ()
1572{
1573 CURLMcode mret;
1574 fd_set rs;
1575 fd_set ws;
1576 fd_set es;
1577 int max;
1578 struct GNUNET_NETWORK_FDSet *grs;
1579 struct GNUNET_NETWORK_FDSet *gws;
1580 long to;
1581 struct GNUNET_TIME_Relative rtime;
1582
1583 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1584 "Scheduling CURL interaction\n");
1585 if (NULL != curl_download_task)
1586 {
1587 GNUNET_SCHEDULER_cancel (curl_download_task);
1588 curl_download_task = NULL;
1589 }
1590 max = -1;
1591 FD_ZERO (&rs);
1592 FD_ZERO (&ws);
1593 FD_ZERO (&es);
1594 if (CURLM_OK != (mret = curl_multi_fdset (curl_multi,
1595 &rs,
1596 &ws,
1597 &es,
1598 &max)))
1599 {
1600 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1601 "%s failed at %s:%d: `%s'\n",
1602 "curl_multi_fdset", __FILE__, __LINE__,
1603 curl_multi_strerror (mret));
1604 return;
1605 }
1606 to = -1;
1607 GNUNET_break (CURLM_OK ==
1608 curl_multi_timeout (curl_multi,
1609 &to));
1610 if (-1 == to)
1611 rtime = GNUNET_TIME_UNIT_FOREVER_REL;
1612 else
1613 rtime = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
1614 to);
1615 if (-1 != max)
1616 {
1617 grs = GNUNET_NETWORK_fdset_create ();
1618 gws = GNUNET_NETWORK_fdset_create ();
1619 GNUNET_NETWORK_fdset_copy_native (grs,
1620 &rs,
1621 max + 1);
1622 GNUNET_NETWORK_fdset_copy_native (gws,
1623 &ws,
1624 max + 1);
1625 curl_download_task = GNUNET_SCHEDULER_add_select (
1626 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1627 rtime,
1628 grs,
1629 gws,
1630 &curl_task_download,
1631 curl_multi);
1632 GNUNET_NETWORK_fdset_destroy (gws);
1633 GNUNET_NETWORK_fdset_destroy (grs);
1634 }
1635 else
1636 {
1637 curl_download_task = GNUNET_SCHEDULER_add_delayed (rtime,
1638 &curl_task_download,
1639 curl_multi);
1640 }
1641}
1642
1643
1644/**
1645 * Task that is run when we are ready to receive more data from curl.
1646 *
1647 * @param cls closure, NULL
1648 */
1649static void
1650curl_task_download (void *cls)
1651{
1652 int running;
1653 int msgnum;
1654 struct CURLMsg *msg;
1655 CURLMcode mret;
1656 struct Socks5Request *s5r;
1657
1658 curl_download_task = NULL;
1659 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1660 "Running CURL interaction\n");
1661 do
1662 {
1663 running = 0;
1664 mret = curl_multi_perform (curl_multi,
1665 &running);
1666 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1667 "Checking CURL multi status: %d\n",
1668 mret);
1669 while (NULL != (msg = curl_multi_info_read (curl_multi,
1670 &msgnum)))
1671 {
1672 GNUNET_break (CURLE_OK ==
1673 curl_easy_getinfo (msg->easy_handle,
1674 CURLINFO_PRIVATE,
1675 (char **) &s5r));
1676 if (NULL == s5r)
1677 {
1678 GNUNET_break (0);
1679 continue;
1680 }
1681 switch (msg->msg)
1682 {
1683 case CURLMSG_NONE:
1684 /* documentation says this is not used */
1685 GNUNET_break (0);
1686 break;
1687
1688 case CURLMSG_DONE:
1689 switch (msg->data.result)
1690 {
1691 case CURLE_OK:
1692 case CURLE_GOT_NOTHING:
1693 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1694 "CURL download %s%s completed.\n",
1695 s5r->domain,
1696 s5r->url);
1697 if (NULL == s5r->response)
1698 {
1699 GNUNET_assert (GNUNET_OK ==
1700 create_mhd_response_from_s5r (s5r));
1701 }
1702 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1703 if (GNUNET_YES == s5r->suspended)
1704 {
1705 MHD_resume_connection (s5r->con);
1706 s5r->suspended = GNUNET_NO;
1707 }
1708 run_mhd_now (s5r->hd);
1709 break;
1710
1711 default:
1712 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1713 "Download curl %s%s failed: %s\n",
1714 s5r->domain,
1715 s5r->url,
1716 curl_easy_strerror (msg->data.result));
1717 /* FIXME: indicate error somehow? close MHD connection badly as well? */
1718 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1719 if (GNUNET_YES == s5r->suspended)
1720 {
1721 MHD_resume_connection (s5r->con);
1722 s5r->suspended = GNUNET_NO;
1723 }
1724 run_mhd_now (s5r->hd);
1725 break;
1726 }
1727 if (NULL == s5r->response)
1728 s5r->response = curl_failure_response;
1729 break;
1730
1731 case CURLMSG_LAST:
1732 /* documentation says this is not used */
1733 GNUNET_break (0);
1734 break;
1735
1736 default:
1737 /* unexpected status code */
1738 GNUNET_break (0);
1739 break;
1740 }
1741 }
1742 ;
1743 }
1744 while (mret == CURLM_CALL_MULTI_PERFORM);
1745 if (CURLM_OK != mret)
1746 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1747 "%s failed at %s:%d: `%s'\n",
1748 "curl_multi_perform", __FILE__, __LINE__,
1749 curl_multi_strerror (mret));
1750 if (0 == running)
1751 {
1752 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1753 "Suspending cURL multi loop, no more events pending\n");
1754 if (NULL != curl_download_task)
1755 {
1756 GNUNET_SCHEDULER_cancel (curl_download_task);
1757 curl_download_task = NULL;
1758 }
1759 return; /* nothing more in progress */
1760 }
1761 curl_download_prepare ();
1762}
1763
1764
1765/* ********************************* MHD response generation ******************* */
1766
1767
1768/**
1769 * Read HTTP request header field from the request. Copies the fields
1770 * over to the 'headers' that will be given to curl. However, 'Host'
1771 * is substituted with the LEHO if present. We also change the
1772 * 'Connection' header value to "close" as the proxy does not support
1773 * pipelining.
1774 *
1775 * @param cls our `struct Socks5Request`
1776 * @param kind value kind
1777 * @param key field key
1778 * @param value field value
1779 * @return #MHD_YES to continue to iterate
1780 */
1781static int
1782con_val_iter (void *cls,
1783 enum MHD_ValueKind kind,
1784 const char *key,
1785 const char *value)
1786{
1787 struct Socks5Request *s5r = cls;
1788 char *hdr;
1789
1790 if ((0 == strcasecmp (MHD_HTTP_HEADER_HOST,
1791 key)) &&
1792 (NULL != s5r->leho))
1793 value = s5r->leho;
1794 GNUNET_asprintf (&hdr,
1795 "%s: %s",
1796 key,
1797 value);
1798 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1799 "Adding HEADER `%s' to HTTP request\n",
1800 hdr);
1801 s5r->headers = curl_slist_append (s5r->headers,
1802 hdr);
1803 GNUNET_free (hdr);
1804 return MHD_YES;
1805}
1806
1807
1808/**
1809 * Main MHD callback for handling requests.
1810 *
1811 * @param cls unused
1812 * @param con MHD connection handle
1813 * @param url the url in the request
1814 * @param meth the HTTP method used ("GET", "PUT", etc.)
1815 * @param ver the HTTP version string ("HTTP/1.1" for version 1.1, etc.)
1816 * @param upload_data the data being uploaded (excluding HEADERS,
1817 * for a POST that fits into memory and that is encoded
1818 * with a supported encoding, the POST data will NOT be
1819 * given in upload_data and is instead available as
1820 * part of MHD_get_connection_values; very large POST
1821 * data *will* be made available incrementally in
1822 * upload_data)
1823 * @param upload_data_size set initially to the size of the
1824 * @a upload_data provided; the method must update this
1825 * value to the number of bytes NOT processed;
1826 * @param con_cls pointer to location where we store the `struct Request`
1827 * @return #MHD_YES if the connection was handled successfully,
1828 * #MHD_NO if the socket must be closed due to a serious
1829 * error while handling the request
1830 */
1831static MHD_RESULT
1832create_response (void *cls,
1833 struct MHD_Connection *con,
1834 const char *url,
1835 const char *meth,
1836 const char *ver,
1837 const char *upload_data,
1838 size_t *upload_data_size,
1839 void **con_cls)
1840{
1841 struct Socks5Request *s5r = *con_cls;
1842 char *curlurl;
1843 char ipstring[INET6_ADDRSTRLEN];
1844 char ipaddr[INET6_ADDRSTRLEN + 2];
1845 char *curl_hosts;
1846 const struct sockaddr *sa;
1847 const struct sockaddr_in *s4;
1848 const struct sockaddr_in6 *s6;
1849 uint16_t port;
1850 size_t left;
1851
1852 if (NULL == s5r)
1853 {
1854 GNUNET_break (0);
1855 return MHD_NO;
1856 }
1857 s5r->con = con;
1858 /* Fresh connection. */
1859 if (SOCKS5_SOCKET_WITH_MHD == s5r->state)
1860 {
1861 /* first time here, initialize curl handle */
1862 if (s5r->is_gns)
1863 {
1864 sa = (const struct sockaddr *) &s5r->destination_address;
1865 switch (sa->sa_family)
1866 {
1867 case AF_INET:
1868 s4 = (const struct sockaddr_in *) &s5r->destination_address;
1869 if (NULL == inet_ntop (AF_INET,
1870 &s4->sin_addr,
1871 ipstring,
1872 sizeof(ipstring)))
1873 {
1874 GNUNET_break (0);
1875 return MHD_NO;
1876 }
1877 GNUNET_snprintf (ipaddr,
1878 sizeof(ipaddr),
1879 "%s",
1880 ipstring);
1881 port = ntohs (s4->sin_port);
1882 break;
1883
1884 case AF_INET6:
1885 s6 = (const struct sockaddr_in6 *) &s5r->destination_address;
1886 if (NULL == inet_ntop (AF_INET6,
1887 &s6->sin6_addr,
1888 ipstring,
1889 sizeof(ipstring)))
1890 {
1891 GNUNET_break (0);
1892 return MHD_NO;
1893 }
1894 GNUNET_snprintf (ipaddr,
1895 sizeof(ipaddr),
1896 "%s",
1897 ipstring);
1898 port = ntohs (s6->sin6_port);
1899 break;
1900
1901 default:
1902 GNUNET_break (0);
1903 return MHD_NO;
1904 }
1905 GNUNET_asprintf (&curl_hosts,
1906 "%s:%d:%s",
1907 s5r->leho,
1908 port,
1909 ipaddr);
1910 s5r->hosts = curl_slist_append (NULL,
1911 curl_hosts);
1912 GNUNET_free (curl_hosts);
1913 }
1914 else
1915 {
1916 port = s5r->port;
1917 }
1918 if (NULL == s5r->curl)
1919 s5r->curl = curl_easy_init ();
1920 if (NULL == s5r->curl)
1921 return MHD_queue_response (con,
1922 MHD_HTTP_INTERNAL_SERVER_ERROR,
1923 curl_failure_response);
1924 curl_easy_setopt (s5r->curl,
1925 CURLOPT_HEADERFUNCTION,
1926 &curl_check_hdr);
1927 curl_easy_setopt (s5r->curl,
1928 CURLOPT_HEADERDATA,
1929 s5r);
1930 curl_easy_setopt (s5r->curl,
1931 CURLOPT_FOLLOWLOCATION,
1932 0);
1933 if (s5r->is_gns)
1934 curl_easy_setopt (s5r->curl,
1935 CURLOPT_IPRESOLVE,
1936 CURL_IPRESOLVE_V4);
1937 curl_easy_setopt (s5r->curl,
1938 CURLOPT_CONNECTTIMEOUT,
1939 600L);
1940 curl_easy_setopt (s5r->curl,
1941 CURLOPT_TIMEOUT,
1942 600L);
1943 curl_easy_setopt (s5r->curl,
1944 CURLOPT_NOSIGNAL,
1945 1L);
1946 curl_easy_setopt (s5r->curl,
1947 CURLOPT_HTTP_CONTENT_DECODING,
1948 0);
1949 curl_easy_setopt (s5r->curl,
1950 CURLOPT_NOSIGNAL,
1951 1L);
1952 curl_easy_setopt (s5r->curl,
1953 CURLOPT_PRIVATE,
1954 s5r);
1955 curl_easy_setopt (s5r->curl,
1956 CURLOPT_VERBOSE,
1957 0L);
1958 /**
1959 * Pre-populate cache to resolve Hostname.
1960 * This is necessary as the DNS name in the CURLOPT_URL is used
1961 * for SNI http://de.wikipedia.org/wiki/Server_Name_Indication
1962 */
1963 if ((NULL != s5r->leho) &&
1964 (NULL != s5r->hosts))
1965 {
1966 curl_easy_setopt (s5r->curl,
1967 CURLOPT_RESOLVE,
1968 s5r->hosts);
1969 }
1970 if (s5r->is_gns)
1971 {
1972 GNUNET_asprintf (&curlurl,
1973 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1974 ? "http://%s:%d%s"
1975 : "https://%s:%d%s",
1976 (NULL != s5r->leho)
1977 ? s5r->leho
1978 : ipaddr,
1979 port,
1980 s5r->url);
1981 }
1982 else
1983 {
1984 GNUNET_asprintf (&curlurl,
1985 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1986 ? "http://%s:%d%s"
1987 : "https://%s:%d%s",
1988 s5r->domain,
1989 port,
1990 s5r->url);
1991 }
1992 curl_easy_setopt (s5r->curl,
1993 CURLOPT_URL,
1994 curlurl);
1995 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1996 "Launching %s CURL interaction, fetching `%s'\n",
1997 (s5r->is_gns) ? "GNS" : "DNS",
1998 curlurl);
1999 GNUNET_free (curlurl);
2000 if (0 == strcasecmp (meth,
2001 MHD_HTTP_METHOD_PUT))
2002 {
2003 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
2004 curl_easy_setopt (s5r->curl,
2005 CURLOPT_UPLOAD,
2006 1L);
2007 curl_easy_setopt (s5r->curl,
2008 CURLOPT_WRITEFUNCTION,
2009 &curl_download_cb);
2010 curl_easy_setopt (s5r->curl,
2011 CURLOPT_WRITEDATA,
2012 s5r);
2013 GNUNET_assert (CURLE_OK ==
2014 curl_easy_setopt (s5r->curl,
2015 CURLOPT_READFUNCTION,
2016 &curl_upload_cb));
2017 curl_easy_setopt (s5r->curl,
2018 CURLOPT_READDATA,
2019 s5r);
2020 {
2021 const char *us;
2022 long upload_size = 0;
2023
2024 us = MHD_lookup_connection_value (con,
2025 MHD_HEADER_KIND,
2026 MHD_HTTP_HEADER_CONTENT_LENGTH);
2027 if ((1 == sscanf (us,
2028 "%ld",
2029 &upload_size)) &&
2030 (upload_size >= 0))
2031 {
2032 curl_easy_setopt (s5r->curl,
2033 CURLOPT_INFILESIZE,
2034 upload_size);
2035 }
2036 }
2037 }
2038 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_POST))
2039 {
2040 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
2041 curl_easy_setopt (s5r->curl,
2042 CURLOPT_POST,
2043 1L);
2044 curl_easy_setopt (s5r->curl,
2045 CURLOPT_WRITEFUNCTION,
2046 &curl_download_cb);
2047 curl_easy_setopt (s5r->curl,
2048 CURLOPT_WRITEDATA,
2049 s5r);
2050 curl_easy_setopt (s5r->curl,
2051 CURLOPT_READFUNCTION,
2052 &curl_upload_cb);
2053 curl_easy_setopt (s5r->curl,
2054 CURLOPT_READDATA,
2055 s5r);
2056 {
2057 const char *us;
2058 long upload_size;
2059
2060 upload_size = 0;
2061 us = MHD_lookup_connection_value (con,
2062 MHD_HEADER_KIND,
2063 MHD_HTTP_HEADER_CONTENT_LENGTH);
2064 if ((NULL != us) &&
2065 (1 == sscanf (us,
2066 "%ld",
2067 &upload_size)) &&
2068 (upload_size >= 0))
2069 {
2070 curl_easy_setopt (s5r->curl,
2071 CURLOPT_INFILESIZE,
2072 upload_size);
2073 }
2074 else
2075 {
2076 curl_easy_setopt (s5r->curl,
2077 CURLOPT_INFILESIZE,
2078 upload_size);
2079 }
2080 }
2081 }
2082 else if (0 == strcasecmp (meth,
2083 MHD_HTTP_METHOD_HEAD))
2084 {
2085 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2086 curl_easy_setopt (s5r->curl,
2087 CURLOPT_NOBODY,
2088 1L);
2089 }
2090 else if (0 == strcasecmp (meth,
2091 MHD_HTTP_METHOD_OPTIONS))
2092 {
2093 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2094 curl_easy_setopt (s5r->curl,
2095 CURLOPT_CUSTOMREQUEST,
2096 "OPTIONS");
2097 curl_easy_setopt (s5r->curl,
2098 CURLOPT_WRITEFUNCTION,
2099 &curl_download_cb);
2100 curl_easy_setopt (s5r->curl,
2101 CURLOPT_WRITEDATA,
2102 s5r);
2103 }
2104 else if (0 == strcasecmp (meth,
2105 MHD_HTTP_METHOD_GET))
2106 {
2107 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2108 curl_easy_setopt (s5r->curl,
2109 CURLOPT_HTTPGET,
2110 1L);
2111 curl_easy_setopt (s5r->curl,
2112 CURLOPT_WRITEFUNCTION,
2113 &curl_download_cb);
2114 curl_easy_setopt (s5r->curl,
2115 CURLOPT_WRITEDATA,
2116 s5r);
2117 }
2118 else if (0 == strcasecmp (meth,
2119 MHD_HTTP_METHOD_DELETE))
2120 {
2121 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2122 curl_easy_setopt (s5r->curl,
2123 CURLOPT_CUSTOMREQUEST,
2124 "DELETE");
2125 curl_easy_setopt (s5r->curl,
2126 CURLOPT_WRITEFUNCTION,
2127 &curl_download_cb);
2128 curl_easy_setopt (s5r->curl,
2129 CURLOPT_WRITEDATA,
2130 s5r);
2131 }
2132 else
2133 {
2134 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2135 _ ("Unsupported HTTP method `%s'\n"),
2136 meth);
2137 curl_easy_cleanup (s5r->curl);
2138 s5r->curl = NULL;
2139 return MHD_NO;
2140 }
2141
2142 if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_0))
2143 {
2144 curl_easy_setopt (s5r->curl,
2145 CURLOPT_HTTP_VERSION,
2146 CURL_HTTP_VERSION_1_0);
2147 }
2148 else if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_1))
2149 {
2150 curl_easy_setopt (s5r->curl,
2151 CURLOPT_HTTP_VERSION,
2152 CURL_HTTP_VERSION_1_1);
2153 }
2154 else
2155 {
2156 curl_easy_setopt (s5r->curl,
2157 CURLOPT_HTTP_VERSION,
2158 CURL_HTTP_VERSION_NONE);
2159 }
2160
2161 if (GNUNET_YES == s5r->is_tls) // (HTTPS_PORT == s5r->port)
2162 {
2163 curl_easy_setopt (s5r->curl,
2164 CURLOPT_USE_SSL,
2165 CURLUSESSL_ALL);
2166 if (0 < s5r->num_danes)
2167 curl_easy_setopt (s5r->curl,
2168 CURLOPT_SSL_VERIFYPEER,
2169 0L);
2170 else
2171 curl_easy_setopt (s5r->curl,
2172 CURLOPT_SSL_VERIFYPEER,
2173 1L);
2174 /* Disable cURL checking the hostname, as we will check ourselves
2175 as only we have the domain name or the LEHO or the DANE record */
2176 curl_easy_setopt (s5r->curl,
2177 CURLOPT_SSL_VERIFYHOST,
2178 0L);
2179 }
2180 else
2181 {
2182 curl_easy_setopt (s5r->curl,
2183 CURLOPT_USE_SSL,
2184 CURLUSESSL_NONE);
2185 }
2186
2187 if (CURLM_OK !=
2188 curl_multi_add_handle (curl_multi,
2189 s5r->curl))
2190 {
2191 GNUNET_break (0);
2192 curl_easy_cleanup (s5r->curl);
2193 s5r->curl = NULL;
2194 return MHD_NO;
2195 }
2196 MHD_get_connection_values (con,
2197 MHD_HEADER_KIND,
2198 (MHD_KeyValueIterator) & con_val_iter,
2199 s5r);
2200 curl_easy_setopt (s5r->curl,
2201 CURLOPT_HTTPHEADER,
2202 s5r->headers);
2203 curl_download_prepare ();
2204 return MHD_YES;
2205 }
2206
2207 /* continuing to process request */
2208 if (0 != *upload_data_size)
2209 {
2210 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2211 "Processing %u bytes UPLOAD\n",
2212 (unsigned int) *upload_data_size);
2213
2214 /* FIXME: This must be set or a header with Transfer-Encoding: chunked. Else
2215 * upload callback is not called!
2216 */
2217 curl_easy_setopt (s5r->curl,
2218 CURLOPT_POSTFIELDSIZE,
2219 *upload_data_size);
2220
2221 left = GNUNET_MIN (*upload_data_size,
2222 sizeof(s5r->io_buf) - s5r->io_len);
2223 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
2224 upload_data,
2225 left);
2226 s5r->io_len += left;
2227 *upload_data_size -= left;
2228 GNUNET_assert (NULL != s5r->curl);
2229 if (GNUNET_YES == s5r->curl_paused)
2230 {
2231 s5r->curl_paused = GNUNET_NO;
2232 curl_easy_pause (s5r->curl,
2233 CURLPAUSE_CONT);
2234 }
2235 return MHD_YES;
2236 }
2237 if (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state)
2238 {
2239 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2240 "Finished processing UPLOAD\n");
2241 s5r->state = SOCKS5_SOCKET_UPLOAD_DONE;
2242 }
2243 if (NULL == s5r->response)
2244 {
2245 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2246 "Waiting for HTTP response for %s%s...\n",
2247 s5r->domain,
2248 s5r->url);
2249 MHD_suspend_connection (con);
2250 s5r->suspended = GNUNET_YES;
2251 return MHD_YES;
2252 }
2253 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2254 "Queueing response for %s%s with MHD\n",
2255 s5r->domain,
2256 s5r->url);
2257 run_mhd_now (s5r->hd);
2258 return MHD_queue_response (con,
2259 s5r->response_code,
2260 s5r->response);
2261}
2262
2263
2264/* ******************** MHD HTTP setup and event loop ******************** */
2265
2266
2267/**
2268 * Function called when MHD decides that we are done with a request.
2269 *
2270 * @param cls NULL
2271 * @param connection connection handle
2272 * @param con_cls value as set by the last call to
2273 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
2274 * @param toe reason for request termination (ignored)
2275 */
2276static void
2277mhd_completed_cb (void *cls,
2278 struct MHD_Connection *connection,
2279 void **con_cls,
2280 enum MHD_RequestTerminationCode toe)
2281{
2282 struct Socks5Request *s5r = *con_cls;
2283
2284 if (NULL == s5r)
2285 return;
2286 if (MHD_REQUEST_TERMINATED_COMPLETED_OK != toe)
2287 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2288 "MHD encountered error handling request: %d\n",
2289 toe);
2290 if (NULL != s5r->curl)
2291 {
2292 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2293 "Removing cURL handle (MHD interaction complete)\n");
2294 curl_multi_remove_handle (curl_multi,
2295 s5r->curl);
2296 curl_slist_free_all (s5r->headers);
2297 s5r->headers = NULL;
2298 curl_easy_reset (s5r->curl);
2299 s5r->rbuf_len = 0;
2300 s5r->wbuf_len = 0;
2301 s5r->io_len = 0;
2302 curl_download_prepare ();
2303 }
2304 if ((NULL != s5r->response) &&
2305 (curl_failure_response != s5r->response))
2306 MHD_destroy_response (s5r->response);
2307 for (struct HttpResponseHeader *header = s5r->header_head;
2308 NULL != header;
2309 header = s5r->header_head)
2310 {
2311 GNUNET_CONTAINER_DLL_remove (s5r->header_head,
2312 s5r->header_tail,
2313 header);
2314 GNUNET_free (header->type);
2315 GNUNET_free (header->value);
2316 GNUNET_free (header);
2317 }
2318 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2319 "Finished request for %s\n",
2320 s5r->url);
2321 GNUNET_free (s5r->url);
2322 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2323 s5r->url = NULL;
2324 s5r->response = NULL;
2325 *con_cls = NULL;
2326}
2327
2328
2329/**
2330 * Function called when MHD connection is opened or closed.
2331 *
2332 * @param cls NULL
2333 * @param connection connection handle
2334 * @param con_cls value as set by the last call to
2335 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
2336 * @param toe connection notification type
2337 */
2338static void
2339mhd_connection_cb (void *cls,
2340 struct MHD_Connection *connection,
2341 void **con_cls,
2342 enum MHD_ConnectionNotificationCode cnc)
2343{
2344 struct Socks5Request *s5r;
2345 const union MHD_ConnectionInfo *ci;
2346 int sock;
2347
2348 switch (cnc)
2349 {
2350 case MHD_CONNECTION_NOTIFY_STARTED:
2351 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection started...\n");
2352 ci = MHD_get_connection_info (connection,
2353 MHD_CONNECTION_INFO_CONNECTION_FD);
2354 if (NULL == ci)
2355 {
2356 GNUNET_break (0);
2357 return;
2358 }
2359 sock = ci->connect_fd;
2360 for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
2361 {
2362 if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
2363 {
2364 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2365 "Context set...\n");
2366 s5r->ssl_checked = GNUNET_NO;
2367 *con_cls = s5r;
2368 break;
2369 }
2370 }
2371 break;
2372
2373 case MHD_CONNECTION_NOTIFY_CLOSED:
2374 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2375 "Connection closed... cleaning up\n");
2376 s5r = *con_cls;
2377 if (NULL == s5r)
2378 {
2379 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2380 "Connection stale!\n");
2381 return;
2382 }
2383 cleanup_s5r (s5r);
2384 curl_download_prepare ();
2385 *con_cls = NULL;
2386 break;
2387
2388 default:
2389 GNUNET_break (0);
2390 }
2391}
2392
2393
2394/**
2395 * Function called when MHD first processes an incoming connection.
2396 * Gives us the respective URI information.
2397 *
2398 * We use this to associate the `struct MHD_Connection` with our
2399 * internal `struct Socks5Request` data structure (by checking
2400 * for matching sockets).
2401 *
2402 * @param cls the HTTP server handle (a `struct MhdHttpList`)
2403 * @param url the URL that is being requested
2404 * @param connection MHD connection object for the request
2405 * @return the `struct Socks5Request` that this @a connection is for
2406 */
2407static void *
2408mhd_log_callback (void *cls,
2409 const char *url,
2410 struct MHD_Connection *connection)
2411{
2412 struct Socks5Request *s5r;
2413 const union MHD_ConnectionInfo *ci;
2414
2415 ci = MHD_get_connection_info (connection,
2416 MHD_CONNECTION_INFO_SOCKET_CONTEXT);
2417 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Processing %s\n", url);
2418 if (NULL == ci)
2419 {
2420 GNUNET_break (0);
2421 return NULL;
2422 }
2423 s5r = ci->socket_context;
2424 if (NULL != s5r->url)
2425 {
2426 GNUNET_break (0);
2427 return NULL;
2428 }
2429 s5r->url = GNUNET_strdup (url);
2430 if (NULL != s5r->timeout_task)
2431 {
2432 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
2433 s5r->timeout_task = NULL;
2434 }
2435 GNUNET_assert (s5r->state == SOCKS5_SOCKET_WITH_MHD);
2436 return s5r;
2437}
2438
2439
2440/**
2441 * Kill the given MHD daemon.
2442 *
2443 * @param hd daemon to stop
2444 */
2445static void
2446kill_httpd (struct MhdHttpList *hd)
2447{
2448 GNUNET_CONTAINER_DLL_remove (mhd_httpd_head,
2449 mhd_httpd_tail,
2450 hd);
2451 GNUNET_free (hd->domain);
2452 MHD_stop_daemon (hd->daemon);
2453 if (NULL != hd->httpd_task)
2454 {
2455 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2456 hd->httpd_task = NULL;
2457 }
2458 GNUNET_free (hd->proxy_cert);
2459 if (hd == httpd)
2460 httpd = NULL;
2461 GNUNET_free (hd);
2462}
2463
2464
2465/**
2466 * Task run whenever HTTP server is idle for too long. Kill it.
2467 *
2468 * @param cls the `struct MhdHttpList *`
2469 */
2470static void
2471kill_httpd_task (void *cls)
2472{
2473 struct MhdHttpList *hd = cls;
2474
2475 hd->httpd_task = NULL;
2476 kill_httpd (hd);
2477}
2478
2479
2480/**
2481 * Task run whenever HTTP server operations are pending.
2482 *
2483 * @param cls the `struct MhdHttpList *` of the daemon that is being run
2484 */
2485static void
2486do_httpd (void *cls);
2487
2488
2489/**
2490 * Schedule MHD. This function should be called initially when an
2491 * MHD is first getting its client socket, and will then automatically
2492 * always be called later whenever there is work to be done.
2493 *
2494 * @param hd the daemon to schedule
2495 */
2496static void
2497schedule_httpd (struct MhdHttpList *hd)
2498{
2499 fd_set rs;
2500 fd_set ws;
2501 fd_set es;
2502 struct GNUNET_NETWORK_FDSet *wrs;
2503 struct GNUNET_NETWORK_FDSet *wws;
2504 int max;
2505 int haveto;
2506 MHD_UNSIGNED_LONG_LONG timeout;
2507 struct GNUNET_TIME_Relative tv;
2508
2509 FD_ZERO (&rs);
2510 FD_ZERO (&ws);
2511 FD_ZERO (&es);
2512 max = -1;
2513 if (MHD_YES !=
2514 MHD_get_fdset (hd->daemon,
2515 &rs,
2516 &ws,
2517 &es,
2518 &max))
2519 {
2520 kill_httpd (hd);
2521 return;
2522 }
2523 haveto = MHD_get_timeout (hd->daemon,
2524 &timeout);
2525 if (MHD_YES == haveto)
2526 tv.rel_value_us = (uint64_t) timeout * 1000LL;
2527 else
2528 tv = GNUNET_TIME_UNIT_FOREVER_REL;
2529 if (-1 != max)
2530 {
2531 wrs = GNUNET_NETWORK_fdset_create ();
2532 wws = GNUNET_NETWORK_fdset_create ();
2533 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
2534 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
2535 }
2536 else
2537 {
2538 wrs = NULL;
2539 wws = NULL;
2540 }
2541 if (NULL != hd->httpd_task)
2542 {
2543 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2544 hd->httpd_task = NULL;
2545 }
2546 if ((MHD_YES != haveto) &&
2547 (-1 == max) &&
2548 (hd != httpd))
2549 {
2550 /* daemon is idle, kill after timeout */
2551 hd->httpd_task = GNUNET_SCHEDULER_add_delayed (MHD_CACHE_TIMEOUT,
2552 &kill_httpd_task,
2553 hd);
2554 }
2555 else
2556 {
2557 hd->httpd_task =
2558 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2559 tv, wrs, wws,
2560 &do_httpd, hd);
2561 }
2562 if (NULL != wrs)
2563 GNUNET_NETWORK_fdset_destroy (wrs);
2564 if (NULL != wws)
2565 GNUNET_NETWORK_fdset_destroy (wws);
2566}
2567
2568
2569static void
2570do_httpd (void *cls)
2571{
2572 struct MhdHttpList *hd = cls;
2573
2574 hd->httpd_task = NULL;
2575 MHD_run (hd->daemon);
2576 schedule_httpd (hd);
2577}
2578
2579
2580/**
2581 * Run MHD now, we have extra data ready for the callback.
2582 *
2583 * @param hd the daemon to run now.
2584 */
2585static void
2586run_mhd_now (struct MhdHttpList *hd)
2587{
2588 if (NULL != hd->httpd_task)
2589 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2590 hd->httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd,
2591 hd);
2592}
2593
2594
2595/**
2596 * Read file in filename
2597 *
2598 * @param filename file to read
2599 * @param size pointer where filesize is stored
2600 * @return NULL on error
2601 */
2602static void*
2603load_file (const char*filename,
2604 unsigned int*size)
2605{
2606 void *buffer;
2607 uint64_t fsize;
2608
2609 if (GNUNET_OK !=
2610 GNUNET_DISK_file_size (filename,
2611 &fsize,
2612 GNUNET_YES,
2613 GNUNET_YES))
2614 return NULL;
2615 if (fsize > MAX_PEM_SIZE)
2616 return NULL;
2617 *size = (unsigned int) fsize;
2618 buffer = GNUNET_malloc (*size);
2619 if (fsize !=
2620 GNUNET_DISK_fn_read (filename,
2621 buffer,
2622 (size_t) fsize))
2623 {
2624 GNUNET_free (buffer);
2625 return NULL;
2626 }
2627 return buffer;
2628}
2629
2630
2631/**
2632 * Load PEM key from file
2633 *
2634 * @param key where to store the data
2635 * @param keyfile path to the PEM file
2636 * @return #GNUNET_OK on success
2637 */
2638static int
2639load_key_from_file (gnutls_x509_privkey_t key,
2640 const char*keyfile)
2641{
2642 gnutls_datum_t key_data;
2643 int ret;
2644
2645 key_data.data = load_file (keyfile,
2646 &key_data.size);
2647 if (NULL == key_data.data)
2648 return GNUNET_SYSERR;
2649 ret = gnutls_x509_privkey_import (key, &key_data,
2650 GNUTLS_X509_FMT_PEM);
2651 if (GNUTLS_E_SUCCESS != ret)
2652 {
2653 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2654 _ ("Unable to import private key from file `%s'\n"),
2655 keyfile);
2656 }
2657 GNUNET_free (key_data.data);
2658 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2659}
2660
2661
2662/**
2663 * Load cert from file
2664 *
2665 * @param crt struct to store data in
2666 * @param certfile path to pem file
2667 * @return #GNUNET_OK on success
2668 */
2669static int
2670load_cert_from_file (gnutls_x509_crt_t crt,
2671 const char*certfile)
2672{
2673 gnutls_datum_t cert_data;
2674 int ret;
2675
2676 cert_data.data = load_file (certfile,
2677 &cert_data.size);
2678 if (NULL == cert_data.data)
2679 return GNUNET_SYSERR;
2680 ret = gnutls_x509_crt_import (crt,
2681 &cert_data,
2682 GNUTLS_X509_FMT_PEM);
2683 if (GNUTLS_E_SUCCESS != ret)
2684 {
2685 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2686 _ ("Unable to import certificate from `%s'\n"),
2687 certfile);
2688 }
2689 GNUNET_free (cert_data.data);
2690 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2691}
2692
2693
2694/**
2695 * Generate new certificate for specific name
2696 *
2697 * @param name the subject name to generate a cert for
2698 * @return a struct holding the PEM data, NULL on error
2699 */
2700static struct ProxyGNSCertificate *
2701generate_gns_certificate (const char *name)
2702{
2703 unsigned int serial;
2704 size_t key_buf_size;
2705 size_t cert_buf_size;
2706 gnutls_x509_crt_t request;
2707 time_t etime;
2708 struct tm *tm_data;
2709 struct ProxyGNSCertificate *pgc;
2710
2711 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2712 "Generating x.509 certificate for `%s'\n",
2713 name);
2714 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_init (&request));
2715 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_key (request,
2716 proxy_ca.key));
2717 pgc = GNUNET_new (struct ProxyGNSCertificate);
2718 gnutls_x509_crt_set_dn_by_oid (request,
2719 GNUTLS_OID_X520_COUNTRY_NAME,
2720 0,
2721 "ZZ",
2722 strlen ("ZZ"));
2723 gnutls_x509_crt_set_dn_by_oid (request,
2724 GNUTLS_OID_X520_ORGANIZATION_NAME,
2725 0,
2726 "GNU Name System",
2727 strlen ("GNU Name System"));
2728 gnutls_x509_crt_set_dn_by_oid (request,
2729 GNUTLS_OID_X520_COMMON_NAME,
2730 0,
2731 name,
2732 strlen (name));
2733 gnutls_x509_crt_set_subject_alternative_name (request,
2734 GNUTLS_SAN_DNSNAME,
2735 name);
2736 GNUNET_break (GNUTLS_E_SUCCESS ==
2737 gnutls_x509_crt_set_version (request,
2738 3));
2739 gnutls_rnd (GNUTLS_RND_NONCE,
2740 &serial,
2741 sizeof(serial));
2742 gnutls_x509_crt_set_serial (request,
2743 &serial,
2744 sizeof(serial));
2745 etime = time (NULL);
2746 tm_data = localtime (&etime);
2747 tm_data->tm_hour--;
2748 etime = mktime (tm_data);
2749 gnutls_x509_crt_set_activation_time (request,
2750 etime);
2751 tm_data->tm_year++;
2752 etime = mktime (tm_data);
2753 gnutls_x509_crt_set_expiration_time (request,
2754 etime);
2755 gnutls_x509_crt_sign2 (request,
2756 proxy_ca.cert,
2757 proxy_ca.key,
2758 GNUTLS_DIG_SHA512,
2759 0);
2760 key_buf_size = sizeof(pgc->key);
2761 cert_buf_size = sizeof(pgc->cert);
2762 gnutls_x509_crt_export (request,
2763 GNUTLS_X509_FMT_PEM,
2764 pgc->cert,
2765 &cert_buf_size);
2766 gnutls_x509_privkey_export (proxy_ca.key,
2767 GNUTLS_X509_FMT_PEM,
2768 pgc->key,
2769 &key_buf_size);
2770 gnutls_x509_crt_deinit (request);
2771 return pgc;
2772}
2773
2774
2775/**
2776 * Function called by MHD with errors, suppresses them all.
2777 *
2778 * @param cls closure
2779 * @param fm format string (`printf()`-style)
2780 * @param ap arguments to @a fm
2781 */
2782static void
2783mhd_error_log_callback (void *cls,
2784 const char *fm,
2785 va_list ap)
2786{
2787 /* do nothing */
2788}
2789
2790
2791/**
2792 * Lookup (or create) an TLS MHD instance for a particular domain.
2793 *
2794 * @param domain the domain the TLS daemon has to serve
2795 * @return NULL on error
2796 */
2797static struct MhdHttpList *
2798lookup_ssl_httpd (const char*domain)
2799{
2800 struct MhdHttpList *hd;
2801 struct ProxyGNSCertificate *pgc;
2802
2803 if (NULL == domain)
2804 {
2805 GNUNET_break (0);
2806 return NULL;
2807 }
2808 for (hd = mhd_httpd_head; NULL != hd; hd = hd->next)
2809 if ((NULL != hd->domain) &&
2810 (0 == strcmp (hd->domain, domain)))
2811 return hd;
2812 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2813 "Starting fresh MHD HTTPS instance for domain `%s'\n",
2814 domain);
2815 pgc = generate_gns_certificate (domain);
2816 hd = GNUNET_new (struct MhdHttpList);
2817 hd->is_ssl = GNUNET_YES;
2818 hd->domain = GNUNET_strdup (domain);
2819 hd->proxy_cert = pgc;
2820 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_SSL
2821 | MHD_USE_NO_LISTEN_SOCKET
2822 | MHD_ALLOW_SUSPEND_RESUME,
2823 0,
2824 NULL, NULL,
2825 &create_response, hd,
2826 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned
2827 int) 16,
2828 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb,
2829 NULL,
2830 MHD_OPTION_NOTIFY_CONNECTION,
2831 &mhd_connection_cb, NULL,
2832 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback,
2833 NULL,
2834 MHD_OPTION_EXTERNAL_LOGGER,
2835 &mhd_error_log_callback, NULL,
2836 MHD_OPTION_HTTPS_MEM_KEY, pgc->key,
2837 MHD_OPTION_HTTPS_MEM_CERT, pgc->cert,
2838 MHD_OPTION_END);
2839 if (NULL == hd->daemon)
2840 {
2841 GNUNET_free (pgc);
2842 GNUNET_free (hd);
2843 return NULL;
2844 }
2845 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
2846 mhd_httpd_tail,
2847 hd);
2848 return hd;
2849}
2850
2851
2852/**
2853 * Task run when a Socks5Request somehow fails to be associated with
2854 * an MHD connection (e.g. because the client never speaks HTTP after
2855 * the SOCKS5 handshake). Clean up.
2856 *
2857 * @param cls the `struct Socks5Request *`
2858 */
2859static void
2860timeout_s5r_handshake (void *cls)
2861{
2862 struct Socks5Request *s5r = cls;
2863
2864 s5r->timeout_task = NULL;
2865 cleanup_s5r (s5r);
2866}
2867
2868
2869/**
2870 * We're done with the Socks5 protocol, now we need to pass the
2871 * connection data through to the final destination, either
2872 * direct (if the protocol might not be HTTP), or via MHD
2873 * (if the port looks like it should be HTTP).
2874 *
2875 * @param s5r socks request that has reached the final stage
2876 */
2877static void
2878setup_data_transfer (struct Socks5Request *s5r)
2879{
2880 struct MhdHttpList *hd;
2881 int fd;
2882 const struct sockaddr *addr;
2883 socklen_t len;
2884 char *domain;
2885
2886 if (GNUNET_YES == s5r->is_tls)
2887 {
2888 GNUNET_asprintf (&domain,
2889 "%s",
2890 s5r->domain);
2891 hd = lookup_ssl_httpd (domain);
2892 if (NULL == hd)
2893 {
2894 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2895 _ ("Failed to start HTTPS server for `%s'\n"),
2896 s5r->domain);
2897 cleanup_s5r (s5r);
2898 GNUNET_free (domain);
2899 return;
2900 }
2901 }
2902 else
2903 {
2904 domain = NULL;
2905 GNUNET_assert (NULL != httpd);
2906 hd = httpd;
2907 }
2908 fd = GNUNET_NETWORK_get_fd (s5r->sock);
2909 addr = GNUNET_NETWORK_get_addr (s5r->sock);
2910 len = GNUNET_NETWORK_get_addrlen (s5r->sock);
2911 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2912 if (MHD_YES !=
2913 MHD_add_connection (hd->daemon,
2914 fd,
2915 addr,
2916 len))
2917 {
2918 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2919 _ ("Failed to pass client to MHD\n"));
2920 cleanup_s5r (s5r);
2921 GNUNET_free (domain);
2922 return;
2923 }
2924 s5r->hd = hd;
2925 schedule_httpd (hd);
2926 s5r->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_HANDSHAKE_TIMEOUT,
2927 &timeout_s5r_handshake,
2928 s5r);
2929 GNUNET_free (domain);
2930}
2931
2932
2933/* ********************* SOCKS handling ************************* */
2934
2935
2936/**
2937 * Write data from buffer to socks5 client, then continue with state machine.
2938 *
2939 * @param cls the closure with the `struct Socks5Request`
2940 */
2941static void
2942do_write (void *cls)
2943{
2944 struct Socks5Request *s5r = cls;
2945 ssize_t len;
2946
2947 s5r->wtask = NULL;
2948 len = GNUNET_NETWORK_socket_send (s5r->sock,
2949 s5r->wbuf,
2950 s5r->wbuf_len);
2951 if (len <= 0)
2952 {
2953 /* write error: connection closed, shutdown, etc.; just clean up */
2954 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2955 "Write Error\n");
2956 cleanup_s5r (s5r);
2957 return;
2958 }
2959 memmove (s5r->wbuf,
2960 &s5r->wbuf[len],
2961 s5r->wbuf_len - len);
2962 s5r->wbuf_len -= len;
2963 if (s5r->wbuf_len > 0)
2964 {
2965 /* not done writing */
2966 s5r->wtask =
2967 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2968 s5r->sock,
2969 &do_write, s5r);
2970 return;
2971 }
2972
2973 /* we're done writing, continue with state machine! */
2974
2975 switch (s5r->state)
2976 {
2977 case SOCKS5_INIT:
2978 GNUNET_assert (0);
2979 break;
2980
2981 case SOCKS5_REQUEST:
2982 GNUNET_assert (NULL != s5r->rtask);
2983 break;
2984
2985 case SOCKS5_DATA_TRANSFER:
2986 setup_data_transfer (s5r);
2987 return;
2988
2989 case SOCKS5_WRITE_THEN_CLEANUP:
2990 cleanup_s5r (s5r);
2991 return;
2992
2993 default:
2994 GNUNET_break (0);
2995 break;
2996 }
2997}
2998
2999
3000/**
3001 * Return a server response message indicating a failure to the client.
3002 *
3003 * @param s5r request to return failure code for
3004 * @param sc status code to return
3005 */
3006static void
3007signal_socks_failure (struct Socks5Request *s5r,
3008 enum Socks5StatusCode sc)
3009{
3010 struct Socks5ServerResponseMessage *s_resp;
3011
3012 GNUNET_break (0 == s5r->wbuf_len); /* Should happen first in any transmission, right? */
3013 GNUNET_assert (SOCKS_BUFFERSIZE - s5r->wbuf_len >=
3014 sizeof(struct Socks5ServerResponseMessage));
3015 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
3016 memset (s_resp, 0, sizeof(struct Socks5ServerResponseMessage));
3017 s_resp->version = SOCKS_VERSION_5;
3018 s_resp->reply = sc;
3019 s5r->state = SOCKS5_WRITE_THEN_CLEANUP;
3020 if (NULL != s5r->wtask)
3021 s5r->wtask =
3022 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
3023 s5r->sock,
3024 &do_write, s5r);
3025}
3026
3027
3028/**
3029 * Return a server response message indicating success.
3030 *
3031 * @param s5r request to return success status message for
3032 */
3033static void
3034signal_socks_success (struct Socks5Request *s5r)
3035{
3036 struct Socks5ServerResponseMessage *s_resp;
3037
3038 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
3039 s_resp->version = SOCKS_VERSION_5;
3040 s_resp->reply = SOCKS5_STATUS_REQUEST_GRANTED;
3041 s_resp->reserved = 0;
3042 s_resp->addr_type = SOCKS5_AT_IPV4;
3043 /* zero out IPv4 address and port */
3044 memset (&s_resp[1],
3045 0,
3046 sizeof(struct in_addr) + sizeof(uint16_t));
3047 s5r->wbuf_len += sizeof(struct Socks5ServerResponseMessage)
3048 + sizeof(struct in_addr) + sizeof(uint16_t);
3049 if (NULL == s5r->wtask)
3050 s5r->wtask =
3051 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
3052 s5r->sock,
3053 &do_write, s5r);
3054}
3055
3056
3057/**
3058 * Process GNS results for target domain.
3059 *
3060 * @param cls the `struct Socks5Request *`
3061 * @param tld #GNUNET_YES if this was a GNS TLD.
3062 * @param rd_count number of records returned
3063 * @param rd record data
3064 */
3065static void
3066handle_gns_result (void *cls,
3067 int tld,
3068 uint32_t rd_count,
3069 const struct GNUNET_GNSRECORD_Data *rd)
3070{
3071 struct Socks5Request *s5r = cls;
3072 const struct GNUNET_GNSRECORD_Data *r;
3073 int got_ip;
3074
3075 s5r->gns_lookup = NULL;
3076 s5r->is_gns = tld;
3077 got_ip = GNUNET_NO;
3078 for (uint32_t i = 0; i < rd_count; i++)
3079 {
3080 r = &rd[i];
3081 switch (r->record_type)
3082 {
3083 case GNUNET_DNSPARSER_TYPE_A:
3084 {
3085 struct sockaddr_in *in;
3086
3087 if (sizeof(struct in_addr) != r->data_size)
3088 {
3089 GNUNET_break_op (0);
3090 break;
3091 }
3092 if (GNUNET_YES == got_ip)
3093 break;
3094 if (GNUNET_OK !=
3095 GNUNET_NETWORK_test_pf (PF_INET))
3096 break;
3097 got_ip = GNUNET_YES;
3098 in = (struct sockaddr_in *) &s5r->destination_address;
3099 in->sin_family = AF_INET;
3100 GNUNET_memcpy (&in->sin_addr,
3101 r->data,
3102 r->data_size);
3103 in->sin_port = htons (s5r->port);
3104#if HAVE_SOCKADDR_IN_SIN_LEN
3105 in->sin_len = sizeof(*in);
3106#endif
3107 }
3108 break;
3109
3110 case GNUNET_DNSPARSER_TYPE_AAAA:
3111 {
3112 struct sockaddr_in6 *in;
3113
3114 if (sizeof(struct in6_addr) != r->data_size)
3115 {
3116 GNUNET_break_op (0);
3117 break;
3118 }
3119 if (GNUNET_YES == got_ip)
3120 break;
3121 if (GNUNET_YES == disable_v6)
3122 break;
3123 if (GNUNET_OK !=
3124 GNUNET_NETWORK_test_pf (PF_INET6))
3125 break;
3126 /* FIXME: allow user to disable IPv6 per configuration option... */
3127 got_ip = GNUNET_YES;
3128 in = (struct sockaddr_in6 *) &s5r->destination_address;
3129 in->sin6_family = AF_INET6;
3130 GNUNET_memcpy (&in->sin6_addr,
3131 r->data,
3132 r->data_size);
3133 in->sin6_port = htons (s5r->port);
3134#if HAVE_SOCKADDR_IN_SIN_LEN
3135 in->sin6_len = sizeof(*in);
3136#endif
3137 }
3138 break;
3139
3140 case GNUNET_GNSRECORD_TYPE_VPN:
3141 GNUNET_break (0); /* should have been translated within GNS */
3142 break;
3143
3144 case GNUNET_GNSRECORD_TYPE_LEHO:
3145 GNUNET_free (s5r->leho);
3146 s5r->leho = GNUNET_strndup (r->data,
3147 r->data_size);
3148 break;
3149
3150 case GNUNET_GNSRECORD_TYPE_BOX:
3151 {
3152 const struct GNUNET_GNSRECORD_BoxRecord *box;
3153
3154 if (r->data_size < sizeof(struct GNUNET_GNSRECORD_BoxRecord))
3155 {
3156 GNUNET_break_op (0);
3157 break;
3158 }
3159 box = r->data;
3160 if ((ntohl (box->record_type) != GNUNET_DNSPARSER_TYPE_TLSA) ||
3161 (ntohs (box->protocol) != IPPROTO_TCP) ||
3162 (ntohs (box->service) != s5r->port))
3163 break; /* BOX record does not apply */
3164 if (s5r->num_danes >= MAX_DANES)
3165 {
3166 GNUNET_break (0); /* MAX_DANES too small */
3167 break;
3168 }
3169 s5r->is_tls = GNUNET_YES; /* This should be TLS */
3170 s5r->dane_data_len[s5r->num_danes]
3171 = r->data_size - sizeof(struct GNUNET_GNSRECORD_BoxRecord);
3172 s5r->dane_data[s5r->num_danes]
3173 = GNUNET_memdup (&box[1],
3174 s5r->dane_data_len[s5r->num_danes]);
3175 s5r->num_danes++;
3176 break;
3177 }
3178
3179 default:
3180 /* don't care */
3181 break;
3182 }
3183 }
3184 if ((GNUNET_YES != got_ip) &&
3185 (GNUNET_YES == tld))
3186 {
3187 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3188 "Name resolution failed to yield useful IP address.\n");
3189 signal_socks_failure (s5r,
3190 SOCKS5_STATUS_GENERAL_FAILURE);
3191 return;
3192 }
3193 s5r->state = SOCKS5_DATA_TRANSFER;
3194 signal_socks_success (s5r);
3195}
3196
3197
3198/**
3199 * Remove the first @a len bytes from the beginning of the read buffer.
3200 *
3201 * @param s5r the handle clear the read buffer for
3202 * @param len number of bytes in read buffer to advance
3203 */
3204static void
3205clear_from_s5r_rbuf (struct Socks5Request *s5r,
3206 size_t len)
3207{
3208 GNUNET_assert (len <= s5r->rbuf_len);
3209 memmove (s5r->rbuf,
3210 &s5r->rbuf[len],
3211 s5r->rbuf_len - len);
3212 s5r->rbuf_len -= len;
3213}
3214
3215
3216/**
3217 * Read data from incoming Socks5 connection
3218 *
3219 * @param cls the closure with the `struct Socks5Request`
3220 */
3221static void
3222do_s5r_read (void *cls)
3223{
3224 struct Socks5Request *s5r = cls;
3225 const struct Socks5ClientHelloMessage *c_hello;
3226 struct Socks5ServerHelloMessage *s_hello;
3227 const struct Socks5ClientRequestMessage *c_req;
3228 ssize_t rlen;
3229 size_t alen;
3230 const struct GNUNET_SCHEDULER_TaskContext *tc;
3231
3232 s5r->rtask = NULL;
3233 tc = GNUNET_SCHEDULER_get_task_context ();
3234 if ((NULL != tc->read_ready) &&
3235 (GNUNET_NETWORK_fdset_isset (tc->read_ready,
3236 s5r->sock)))
3237 {
3238 rlen = GNUNET_NETWORK_socket_recv (s5r->sock,
3239 &s5r->rbuf[s5r->rbuf_len],
3240 sizeof(s5r->rbuf) - s5r->rbuf_len);
3241 if (rlen <= 0)
3242 {
3243 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3244 "socks5 client disconnected.\n");
3245 cleanup_s5r (s5r);
3246 return;
3247 }
3248 s5r->rbuf_len += rlen;
3249 }
3250 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3251 s5r->sock,
3252 &do_s5r_read, s5r);
3253 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3254 "Processing %zu bytes of socks data in state %d\n",
3255 s5r->rbuf_len,
3256 s5r->state);
3257 switch (s5r->state)
3258 {
3259 case SOCKS5_INIT:
3260 c_hello = (const struct Socks5ClientHelloMessage*) &s5r->rbuf;
3261 if ((s5r->rbuf_len < sizeof(struct Socks5ClientHelloMessage)) ||
3262 (s5r->rbuf_len < sizeof(struct Socks5ClientHelloMessage)
3263 + c_hello->num_auth_methods))
3264 return; /* need more data */
3265 if (SOCKS_VERSION_5 != c_hello->version)
3266 {
3267 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3268 _ ("Unsupported socks version %d\n"),
3269 (int) c_hello->version);
3270 cleanup_s5r (s5r);
3271 return;
3272 }
3273 clear_from_s5r_rbuf (s5r,
3274 sizeof(struct Socks5ClientHelloMessage)
3275 + c_hello->num_auth_methods);
3276 GNUNET_assert (0 == s5r->wbuf_len);
3277 s_hello = (struct Socks5ServerHelloMessage *) &s5r->wbuf;
3278 s5r->wbuf_len = sizeof(struct Socks5ServerHelloMessage);
3279 s_hello->version = SOCKS_VERSION_5;
3280 s_hello->auth_method = SOCKS_AUTH_NONE;
3281 GNUNET_assert (NULL == s5r->wtask);
3282 s5r->wtask = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
3283 s5r->sock,
3284 &do_write, s5r);
3285 s5r->state = SOCKS5_REQUEST;
3286 return;
3287
3288 case SOCKS5_REQUEST:
3289 c_req = (const struct Socks5ClientRequestMessage *) &s5r->rbuf;
3290 if (s5r->rbuf_len < sizeof(struct Socks5ClientRequestMessage))
3291 return;
3292 switch (c_req->command)
3293 {
3294 case SOCKS5_CMD_TCP_STREAM:
3295 /* handled below */
3296 break;
3297
3298 default:
3299 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3300 _ ("Unsupported socks command %d\n"),
3301 (int) c_req->command);
3302 signal_socks_failure (s5r,
3303 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED);
3304 return;
3305 }
3306 switch (c_req->addr_type)
3307 {
3308 case SOCKS5_AT_IPV4:
3309 {
3310 const struct in_addr *v4 = (const struct in_addr *) &c_req[1];
3311 const uint16_t *port = (const uint16_t *) &v4[1];
3312 struct sockaddr_in *in;
3313
3314 s5r->port = ntohs (*port);
3315 alen = sizeof(struct in_addr);
3316 if (s5r->rbuf_len < sizeof(struct Socks5ClientRequestMessage)
3317 + alen + sizeof(uint16_t))
3318 return; /* need more data */
3319 in = (struct sockaddr_in *) &s5r->destination_address;
3320 in->sin_family = AF_INET;
3321 in->sin_addr = *v4;
3322 in->sin_port = *port;
3323#if HAVE_SOCKADDR_IN_SIN_LEN
3324 in->sin_len = sizeof(*in);
3325#endif
3326 s5r->state = SOCKS5_DATA_TRANSFER;
3327 }
3328 break;
3329
3330 case SOCKS5_AT_IPV6:
3331 {
3332 const struct in6_addr *v6 = (const struct in6_addr *) &c_req[1];
3333 const uint16_t *port = (const uint16_t *) &v6[1];
3334 struct sockaddr_in6 *in;
3335
3336 s5r->port = ntohs (*port);
3337 alen = sizeof(struct in6_addr);
3338 if (s5r->rbuf_len < sizeof(struct Socks5ClientRequestMessage)
3339 + alen + sizeof(uint16_t))
3340 return; /* need more data */
3341 in = (struct sockaddr_in6 *) &s5r->destination_address;
3342 in->sin6_family = AF_INET6;
3343 in->sin6_addr = *v6;
3344 in->sin6_port = *port;
3345#if HAVE_SOCKADDR_IN_SIN_LEN
3346 in->sin6_len = sizeof(*in);
3347#endif
3348 s5r->state = SOCKS5_DATA_TRANSFER;
3349 }
3350 break;
3351
3352 case SOCKS5_AT_DOMAINNAME:
3353 {
3354 const uint8_t *dom_len;
3355 const char *dom_name;
3356 const uint16_t *port;
3357
3358 dom_len = (const uint8_t *) &c_req[1];
3359 alen = *dom_len + 1;
3360 if (s5r->rbuf_len < sizeof(struct Socks5ClientRequestMessage)
3361 + alen + sizeof(uint16_t))
3362 return; /* need more data */
3363 dom_name = (const char *) &dom_len[1];
3364 port = (const uint16_t *) &dom_name[*dom_len];
3365 s5r->domain = GNUNET_strndup (dom_name,
3366 *dom_len);
3367 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3368 "Requested connection is to %s:%d\n",
3369 // (HTTPS_PORT == s5r->port) ? "s" : "",
3370 s5r->domain,
3371 ntohs (*port));
3372 s5r->state = SOCKS5_RESOLVING;
3373 s5r->port = ntohs (*port);
3374 s5r->is_tls = (HTTPS_PORT == s5r->port) ? GNUNET_YES : GNUNET_NO;
3375 s5r->gns_lookup = GNUNET_GNS_lookup_with_tld (gns_handle,
3376 s5r->domain,
3377 GNUNET_DNSPARSER_TYPE_A,
3378 GNUNET_GNS_LO_LOCAL_MASTER /* only cached */,
3379 &handle_gns_result,
3380 s5r);
3381 break;
3382 }
3383
3384 default:
3385 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3386 _ ("Unsupported socks address type %d\n"),
3387 (int) c_req->addr_type);
3388 signal_socks_failure (s5r,
3389 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED);
3390 return;
3391 }
3392 clear_from_s5r_rbuf (s5r,
3393 sizeof(struct Socks5ClientRequestMessage)
3394 + alen + sizeof(uint16_t));
3395 if (0 != s5r->rbuf_len)
3396 {
3397 /* read more bytes than healthy, why did the client send more!? */
3398 GNUNET_break_op (0);
3399 signal_socks_failure (s5r,
3400 SOCKS5_STATUS_GENERAL_FAILURE);
3401 return;
3402 }
3403 if (SOCKS5_DATA_TRANSFER == s5r->state)
3404 {
3405 /* if we are not waiting for GNS resolution, signal success */
3406 signal_socks_success (s5r);
3407 }
3408 /* We are done reading right now */
3409 GNUNET_SCHEDULER_cancel (s5r->rtask);
3410 s5r->rtask = NULL;
3411 return;
3412
3413 case SOCKS5_RESOLVING:
3414 GNUNET_assert (0);
3415 return;
3416
3417 case SOCKS5_DATA_TRANSFER:
3418 GNUNET_assert (0);
3419 return;
3420
3421 default:
3422 GNUNET_assert (0);
3423 return;
3424 }
3425}
3426
3427
3428/**
3429 * Accept new incoming connections
3430 *
3431 * @param cls the closure with the lsock4 or lsock6
3432 */
3433static void
3434do_accept (void *cls)
3435{
3436 struct GNUNET_NETWORK_Handle *lsock = cls;
3437 struct GNUNET_NETWORK_Handle *s;
3438 struct Socks5Request *s5r;
3439
3440 GNUNET_assert (NULL != lsock);
3441 if (lsock == lsock4)
3442 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3443 lsock,
3444 &do_accept,
3445 lsock);
3446 else if (lsock == lsock6)
3447 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3448 lsock,
3449 &do_accept,
3450 lsock);
3451 else
3452 GNUNET_assert (0);
3453 s = GNUNET_NETWORK_socket_accept (lsock,
3454 NULL,
3455 NULL);
3456 if (NULL == s)
3457 {
3458 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3459 "accept");
3460 return;
3461 }
3462 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3463 "Got an inbound connection, waiting for data\n");
3464 s5r = GNUNET_new (struct Socks5Request);
3465 GNUNET_CONTAINER_DLL_insert (s5r_head,
3466 s5r_tail,
3467 s5r);
3468 s5r->sock = s;
3469 s5r->state = SOCKS5_INIT;
3470 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3471 s5r->sock,
3472 &do_s5r_read,
3473 s5r);
3474}
3475
3476
3477/* ******************* General / main code ********************* */
3478
3479
3480/**
3481 * Task run on shutdown
3482 *
3483 * @param cls closure
3484 */
3485static void
3486do_shutdown (void *cls)
3487{
3488 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3489 "Shutting down...\n");
3490 /* MHD requires resuming before destroying the daemons */
3491 for (struct Socks5Request *s5r = s5r_head;
3492 NULL != s5r;
3493 s5r = s5r->next)
3494 {
3495 if (s5r->suspended)
3496 {
3497 s5r->suspended = GNUNET_NO;
3498 MHD_resume_connection (s5r->con);
3499 }
3500 }
3501 while (NULL != mhd_httpd_head)
3502 kill_httpd (mhd_httpd_head);
3503 while (NULL != s5r_head)
3504 cleanup_s5r (s5r_head);
3505 if (NULL != lsock4)
3506 {
3507 GNUNET_NETWORK_socket_close (lsock4);
3508 lsock4 = NULL;
3509 }
3510 if (NULL != lsock6)
3511 {
3512 GNUNET_NETWORK_socket_close (lsock6);
3513 lsock6 = NULL;
3514 }
3515 if (NULL != curl_multi)
3516 {
3517 curl_multi_cleanup (curl_multi);
3518 curl_multi = NULL;
3519 }
3520 if (NULL != gns_handle)
3521 {
3522 GNUNET_GNS_disconnect (gns_handle);
3523 gns_handle = NULL;
3524 }
3525 if (NULL != curl_download_task)
3526 {
3527 GNUNET_SCHEDULER_cancel (curl_download_task);
3528 curl_download_task = NULL;
3529 }
3530 if (NULL != ltask4)
3531 {
3532 GNUNET_SCHEDULER_cancel (ltask4);
3533 ltask4 = NULL;
3534 }
3535 if (NULL != ltask6)
3536 {
3537 GNUNET_SCHEDULER_cancel (ltask6);
3538 ltask6 = NULL;
3539 }
3540 gnutls_x509_crt_deinit (proxy_ca.cert);
3541 gnutls_x509_privkey_deinit (proxy_ca.key);
3542 gnutls_global_deinit ();
3543}
3544
3545
3546/**
3547 * Create an IPv4 listen socket bound to our port.
3548 *
3549 * @return NULL on error
3550 */
3551static struct GNUNET_NETWORK_Handle *
3552bind_v4 ()
3553{
3554 struct GNUNET_NETWORK_Handle *ls;
3555 struct sockaddr_in sa4;
3556 int eno;
3557
3558 memset (&sa4, 0, sizeof(sa4));
3559 sa4.sin_family = AF_INET;
3560 sa4.sin_port = htons (port);
3561 sa4.sin_addr.s_addr = address;
3562#if HAVE_SOCKADDR_IN_SIN_LEN
3563 sa4.sin_len = sizeof(sa4);
3564#endif
3565 ls = GNUNET_NETWORK_socket_create (AF_INET,
3566 SOCK_STREAM,
3567 0);
3568 if (NULL == ls)
3569 return NULL;
3570 if (GNUNET_OK !=
3571 GNUNET_NETWORK_socket_bind (ls,
3572 (const struct sockaddr *) &sa4,
3573 sizeof(sa4)))
3574 {
3575 eno = errno;
3576 GNUNET_NETWORK_socket_close (ls);
3577 errno = eno;
3578 return NULL;
3579 }
3580 return ls;
3581}
3582
3583
3584/**
3585 * Create an IPv6 listen socket bound to our port.
3586 *
3587 * @return NULL on error
3588 */
3589static struct GNUNET_NETWORK_Handle *
3590bind_v6 ()
3591{
3592 struct GNUNET_NETWORK_Handle *ls;
3593 struct sockaddr_in6 sa6;
3594 int eno;
3595
3596 memset (&sa6, 0, sizeof(sa6));
3597 sa6.sin6_family = AF_INET6;
3598 sa6.sin6_port = htons (port);
3599 sa6.sin6_addr = address6;
3600#if HAVE_SOCKADDR_IN_SIN_LEN
3601 sa6.sin6_len = sizeof(sa6);
3602#endif
3603 ls = GNUNET_NETWORK_socket_create (AF_INET6,
3604 SOCK_STREAM,
3605 0);
3606 if (NULL == ls)
3607 return NULL;
3608 if (GNUNET_OK !=
3609 GNUNET_NETWORK_socket_bind (ls,
3610 (const struct sockaddr *) &sa6,
3611 sizeof(sa6)))
3612 {
3613 eno = errno;
3614 GNUNET_NETWORK_socket_close (ls);
3615 errno = eno;
3616 return NULL;
3617 }
3618 return ls;
3619}
3620
3621
3622/**
3623 * Main function that will be run
3624 *
3625 * @param cls closure
3626 * @param args remaining command-line arguments
3627 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
3628 * @param c configuration
3629 */
3630static void
3631run (void *cls,
3632 char *const *args,
3633 const char *cfgfile,
3634 const struct GNUNET_CONFIGURATION_Handle *c)
3635{
3636 char*cafile_cfg = NULL;
3637 char*cafile;
3638 char*addr_str;
3639 struct MhdHttpList *hd;
3640
3641 cfg = c;
3642
3643 /* Get address to bind to */
3644 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg, "gns-proxy",
3645 "BIND_TO",
3646 &addr_str))
3647 {
3648 // No address specified
3649 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3650 "Don't know what to bind to...\n");
3651 GNUNET_free (addr_str);
3652 GNUNET_SCHEDULER_shutdown ();
3653 return;
3654 }
3655 if (1 != inet_pton (AF_INET, addr_str, &address))
3656 {
3657 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3658 "Unable to parse address %s\n",
3659 addr_str);
3660 GNUNET_free (addr_str);
3661 GNUNET_SCHEDULER_shutdown ();
3662 return;
3663 }
3664 GNUNET_free (addr_str);
3665 /* Get address to bind to */
3666 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg, "gns-proxy",
3667 "BIND_TO6",
3668 &addr_str))
3669 {
3670 // No address specified
3671 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3672 "Don't know what to bind6 to...\n");
3673 GNUNET_free (addr_str);
3674 GNUNET_SCHEDULER_shutdown ();
3675 return;
3676 }
3677 if (1 != inet_pton (AF_INET6, addr_str, &address6))
3678 {
3679 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3680 "Unable to parse IPv6 address %s\n",
3681 addr_str);
3682 GNUNET_free (addr_str);
3683 GNUNET_SCHEDULER_shutdown ();
3684 return;
3685 }
3686 GNUNET_free (addr_str);
3687
3688 if (NULL == (curl_multi = curl_multi_init ()))
3689 {
3690 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3691 "Failed to create cURL multi handle!\n");
3692 return;
3693 }
3694 cafile = cafile_opt;
3695 if (NULL == cafile)
3696 {
3697 if (GNUNET_OK !=
3698 GNUNET_CONFIGURATION_get_value_filename (cfg,
3699 "gns-proxy",
3700 "PROXY_CACERT",
3701 &cafile_cfg))
3702 {
3703 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
3704 "gns-proxy",
3705 "PROXY_CACERT");
3706 return;
3707 }
3708 cafile = cafile_cfg;
3709 }
3710 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3711 "Using `%s' as CA\n",
3712 cafile);
3713
3714 gnutls_global_init ();
3715 gnutls_x509_crt_init (&proxy_ca.cert);
3716 gnutls_x509_privkey_init (&proxy_ca.key);
3717
3718 if ((GNUNET_OK !=
3719 load_cert_from_file (proxy_ca.cert,
3720 cafile)) ||
3721 (GNUNET_OK !=
3722 load_key_from_file (proxy_ca.key,
3723 cafile)))
3724 {
3725 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3726 _ ("Failed to load X.509 key and certificate from `%s'\n"),
3727 cafile);
3728 gnutls_x509_crt_deinit (proxy_ca.cert);
3729 gnutls_x509_privkey_deinit (proxy_ca.key);
3730 gnutls_global_deinit ();
3731 GNUNET_free (cafile_cfg);
3732 return;
3733 }
3734 GNUNET_free (cafile_cfg);
3735 if (NULL == (gns_handle = GNUNET_GNS_connect (cfg)))
3736 {
3737 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3738 "Unable to connect to GNS!\n");
3739 gnutls_x509_crt_deinit (proxy_ca.cert);
3740 gnutls_x509_privkey_deinit (proxy_ca.key);
3741 gnutls_global_deinit ();
3742 return;
3743 }
3744 GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
3745 NULL);
3746
3747 /* Open listen socket for socks proxy */
3748 lsock6 = bind_v6 ();
3749 if (NULL == lsock6)
3750 {
3751 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3752 "bind");
3753 }
3754 else
3755 {
3756 if (GNUNET_OK !=
3757 GNUNET_NETWORK_socket_listen (lsock6,
3758 5))
3759 {
3760 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3761 "listen");
3762 GNUNET_NETWORK_socket_close (lsock6);
3763 lsock6 = NULL;
3764 }
3765 else
3766 {
3767 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3768 lsock6,
3769 &do_accept,
3770 lsock6);
3771 }
3772 }
3773 lsock4 = bind_v4 ();
3774 if (NULL == lsock4)
3775 {
3776 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3777 "bind");
3778 }
3779 else
3780 {
3781 if (GNUNET_OK !=
3782 GNUNET_NETWORK_socket_listen (lsock4,
3783 5))
3784 {
3785 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3786 "listen");
3787 GNUNET_NETWORK_socket_close (lsock4);
3788 lsock4 = NULL;
3789 }
3790 else
3791 {
3792 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3793 lsock4,
3794 &do_accept,
3795 lsock4);
3796 }
3797 }
3798 if ((NULL == lsock4) &&
3799 (NULL == lsock6))
3800 {
3801 GNUNET_SCHEDULER_shutdown ();
3802 return;
3803 }
3804 if (CURLSSLSET_OK != curl_global_sslset (CURLSSLBACKEND_GNUTLS,
3805 NULL,
3806 NULL))
3807 {
3808 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3809 "cURL does not support the GnuTLS backend\n");
3810
3811 }
3812 if (0 != curl_global_init (CURL_GLOBAL_WIN32))
3813 {
3814 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3815 "cURL global init failed!\n");
3816 GNUNET_SCHEDULER_shutdown ();
3817 return;
3818 }
3819 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3820 "Proxy listens on port %u\n",
3821 (unsigned int) port);
3822
3823 /* start MHD daemon for HTTP */
3824 hd = GNUNET_new (struct MhdHttpList);
3825 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_NO_LISTEN_SOCKET
3826 | MHD_ALLOW_SUSPEND_RESUME,
3827 0,
3828 NULL, NULL,
3829 &create_response, hd,
3830 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned
3831 int) 16,
3832 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb,
3833 NULL,
3834 MHD_OPTION_NOTIFY_CONNECTION,
3835 &mhd_connection_cb, NULL,
3836 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback,
3837 NULL,
3838 MHD_OPTION_END);
3839 if (NULL == hd->daemon)
3840 {
3841 GNUNET_free (hd);
3842 GNUNET_SCHEDULER_shutdown ();
3843 return;
3844 }
3845 httpd = hd;
3846 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
3847 mhd_httpd_tail,
3848 hd);
3849}
3850
3851
3852/**
3853 * The main function for gnunet-gns-proxy.
3854 *
3855 * @param argc number of arguments from the command line
3856 * @param argv command line arguments
3857 * @return 0 ok, 1 on error
3858 */
3859int
3860main (int argc,
3861 char *const *argv)
3862{
3863 struct GNUNET_GETOPT_CommandLineOption options[] = {
3864 GNUNET_GETOPT_option_uint16 ('p',
3865 "port",
3866 NULL,
3867 gettext_noop (
3868 "listen on specified port (default: 7777)"),
3869 &port),
3870 GNUNET_GETOPT_option_string ('a',
3871 "authority",
3872 NULL,
3873 gettext_noop ("pem file to use as CA"),
3874 &cafile_opt),
3875 GNUNET_GETOPT_option_flag ('6',
3876 "disable-ivp6",
3877 gettext_noop ("disable use of IPv6"),
3878 &disable_v6),
3879
3880 GNUNET_GETOPT_OPTION_END
3881 };
3882 static const char*page =
3883 "<html><head><title>gnunet-gns-proxy</title>"
3884 "</head><body>cURL fail</body></html>";
3885 int ret;
3886
3887 if (GNUNET_OK !=
3888 GNUNET_STRINGS_get_utf8_args (argc, argv,
3889 &argc, &argv))
3890 return 2;
3891 GNUNET_log_setup ("gnunet-gns-proxy",
3892 "WARNING",
3893 NULL);
3894 curl_failure_response
3895 = MHD_create_response_from_buffer (strlen (page),
3896 (void *) page,
3897 MHD_RESPMEM_PERSISTENT);
3898
3899 ret =
3900 (GNUNET_OK ==
3901 GNUNET_PROGRAM_run (argc, argv,
3902 "gnunet-gns-proxy",
3903 _ ("GNUnet GNS proxy"),
3904 options,
3905 &run, NULL)) ? 0 : 1;
3906 MHD_destroy_response (curl_failure_response);
3907 GNUNET_free_nz ((char *) argv);
3908 return ret;
3909}
3910
3911
3912/* end of gnunet-gns-proxy.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-02 23:21:04 +0000