2 This file is part of GNUnet.
3 (C) 2012-2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
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 certificats to make GNS work
25 * with legacy browsers
28 * - double-check queueing logic
29 * - improve IPv6 support (#3037)
30 * - actually check SSL certificates (#3038)
33 #include <microhttpd.h>
34 #include <curl/curl.h>
35 #include <gnutls/gnutls.h>
36 #include <gnutls/x509.h>
37 #include <gnutls/abstract.h>
38 #include <gnutls/crypto.h>
40 #include "gnunet_util_lib.h"
41 #include "gnunet_gns_service.h"
42 #include "gnunet_identity_service.h"
47 * Default Socks5 listen port.
49 #define GNUNET_GNS_PROXY_PORT 7777
52 * Maximum supported length for a URI.
53 * Should die. @deprecated
55 #define MAX_HTTP_URI_LENGTH 2048
58 * Size of the buffer for the data upload / download. Must be
59 * enough for curl, thus CURL_MAX_WRITE_SIZE is needed here (16k).
61 #define IO_BUFFERSIZE CURL_MAX_WRITE_SIZE
64 * Size of the read/write buffers for Socks. Uses
65 * 256 bytes for the hostname (at most), plus a few
66 * bytes overhead for the messages.
68 #define SOCKS_BUFFERSIZE (256 + 32)
71 * Port for plaintext HTTP.
78 #define HTTPS_PORT 443
81 * Largest allowed size for a PEM certificate.
83 #define MAX_PEM_SIZE (10 * 1024)
86 * After how long do we clean up unused MHD SSL/TLS instances?
88 #define MHD_CACHE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
91 * After how long do we clean up Socks5 handles that failed to show any activity
92 * with their respective MHD instance?
94 #define HTTP_HANDSHAKE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
100 * @param level log level
101 * @param fun name of curl_easy-function that gave the error
102 * @param rc return code from curl
104 #define LOG_CURL_EASY(level,fun,rc) GNUNET_log(level, _("%s failed at %s:%d: `%s'\n"), fun, __FILE__, __LINE__, curl_easy_strerror (rc))
107 /* *************** Socks protocol definitions (move to TUN?) ****************** */
110 * Which SOCKS version do we speak?
112 #define SOCKS_VERSION_5 0x05
115 * Flag to set for 'no authentication'.
117 #define SOCKS_AUTH_NONE 0
121 * Commands in Socks5.
126 * Establish TCP/IP stream.
128 SOCKS5_CMD_TCP_STREAM = 1,
131 * Establish TCP port binding.
133 SOCKS5_CMD_TCP_PORT = 2,
136 * Establish UDP port binding.
138 SOCKS5_CMD_UDP_PORT = 3
143 * Address types in Socks5.
145 enum Socks5AddressType
155 SOCKS5_AT_DOMAINNAME = 3,
166 * Status codes in Socks5 response.
168 enum Socks5StatusCode
170 SOCKS5_STATUS_REQUEST_GRANTED = 0,
171 SOCKS5_STATUS_GENERAL_FAILURE = 1,
172 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE = 2,
173 SOCKS5_STATUS_NETWORK_UNREACHABLE = 3,
174 SOCKS5_STATUS_HOST_UNREACHABLE = 4,
175 SOCKS5_STATUS_CONNECTION_REFUSED_BY_HOST = 5,
176 SOCKS5_STATUS_TTL_EXPIRED = 6,
177 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED = 7,
178 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED = 8
183 * Client hello in Socks5 protocol.
185 struct Socks5ClientHelloMessage
188 * Should be #SOCKS_VERSION_5.
193 * How many authentication methods does the client support.
195 uint8_t num_auth_methods;
197 /* followed by supported authentication methods, 1 byte per method */
203 * Server hello in Socks5 protocol.
205 struct Socks5ServerHelloMessage
208 * Should be #SOCKS_VERSION_5.
213 * Chosen authentication method, for us always #SOCKS_AUTH_NONE,
214 * which skips the authentication step.
221 * Client socks request in Socks5 protocol.
223 struct Socks5ClientRequestMessage
226 * Should be #SOCKS_VERSION_5.
231 * Command code, we only uspport #SOCKS5_CMD_TCP_STREAM.
236 * Reserved, always zero.
241 * Address type, an `enum Socks5AddressType`.
246 * Followed by either an ip4/ipv6 address or a domain name with a
247 * length field (uint8_t) in front (depending on @e addr_type).
248 * followed by port number in network byte order (uint16_t).
254 * Server response to client requests in Socks5 protocol.
256 struct Socks5ServerResponseMessage
259 * Should be #SOCKS_VERSION_5.
264 * Status code, an `enum Socks5StatusCode`
274 * Address type, an `enum Socks5AddressType`.
279 * Followed by either an ip4/ipv6 address or a domain name with a
280 * length field (uint8_t) in front (depending on @e addr_type).
281 * followed by port number in network byte order (uint16_t).
288 /* *********************** Datastructures for HTTP handling ****************** */
291 * A structure for CA cert/key
298 gnutls_x509_crt_t cert;
303 gnutls_x509_privkey_t key;
308 * Structure for GNS certificates
310 struct ProxyGNSCertificate
313 * The certificate as PEM
315 char cert[MAX_PEM_SIZE];
318 * The private key as PEM
320 char key[MAX_PEM_SIZE];
326 * A structure for all running Httpds
333 struct MhdHttpList *prev;
338 struct MhdHttpList *next;
341 * the domain name to server (only important for SSL)
348 struct MHD_Daemon *daemon;
351 * Optional proxy certificate used
353 struct ProxyGNSCertificate *proxy_cert;
358 GNUNET_SCHEDULER_TaskIdentifier httpd_task;
361 * is this an ssl daemon?
368 /* ***************** Datastructures for Socks handling **************** */
377 * We're waiting to get the client hello.
382 * We're waiting to get the initial request.
387 * We are currently resolving the destination.
392 * We're in transfer mode.
394 SOCKS5_DATA_TRANSFER,
397 * Finish writing the write buffer, then clean up.
399 SOCKS5_WRITE_THEN_CLEANUP,
402 * Socket has been passed to MHD, do not close it anymore.
404 SOCKS5_SOCKET_WITH_MHD,
407 * We've finished receiving upload data from MHD.
409 SOCKS5_SOCKET_UPLOAD_STARTED,
412 * We've finished receiving upload data from MHD.
414 SOCKS5_SOCKET_UPLOAD_DONE,
417 * We've finished uploading data via CURL and can now download.
419 SOCKS5_SOCKET_DOWNLOAD_STARTED,
422 * We've finished receiving download data from cURL.
424 SOCKS5_SOCKET_DOWNLOAD_DONE
430 * A structure for socks requests
438 struct Socks5Request *next;
443 struct Socks5Request *prev;
448 struct GNUNET_NETWORK_Handle *sock;
451 * Handle to GNS lookup, during #SOCKS5_RESOLVING phase.
453 struct GNUNET_GNS_LookupRequest *gns_lookup;
456 * Client socket read task
458 GNUNET_SCHEDULER_TaskIdentifier rtask;
461 * Client socket write task
463 GNUNET_SCHEDULER_TaskIdentifier wtask;
468 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
473 char rbuf[SOCKS_BUFFERSIZE];
478 char wbuf[SOCKS_BUFFERSIZE];
481 * Buffer we use for moving data between MHD and curl (in both directions).
483 char io_buf[IO_BUFFERSIZE];
486 * MHD HTTP instance handling this request, NULL for none.
488 struct MhdHttpList *hd;
491 * MHD response object for this request.
493 struct MHD_Response *response;
496 * the domain name to server (only important for SSL)
501 * DNS Legacy Host Name as given by GNS, NULL if not given.
516 * HTTP request headers for the curl request.
518 struct curl_slist *headers;
521 * HTTP response code to give to MHD for the response.
523 unsigned int response_code;
526 * Number of bytes already in read buffer
531 * Number of bytes already in write buffer
536 * Number of bytes already in the IO buffer.
541 * Once known, what's the target address for the connection?
543 struct sockaddr_storage destination_address;
548 enum SocksPhase state;
551 * Desired destination port.
559 /* *********************** Globals **************************** */
563 * The port the proxy is running on (default 7777)
565 static unsigned long port = GNUNET_GNS_PROXY_PORT;
568 * The CA file (pem) to use for the proxy CA
570 static char *cafile_opt;
573 * The listen socket of the proxy
575 static struct GNUNET_NETWORK_Handle *lsock;
580 static GNUNET_SCHEDULER_TaskIdentifier ltask;
583 * The cURL download task (curl multi API).
585 static GNUNET_SCHEDULER_TaskIdentifier curl_download_task;
588 * The cURL multi handle
590 static CURLM *curl_multi;
593 * Handle to the GNS service
595 static struct GNUNET_GNS_Handle *gns_handle;
598 * DLL for http/https daemons
600 static struct MhdHttpList *mhd_httpd_head;
603 * DLL for http/https daemons
605 static struct MhdHttpList *mhd_httpd_tail;
608 * Daemon for HTTP (we have one per SSL certificate, and then one for
609 * all HTTP connections; this is the one for HTTP, not HTTPS).
611 static struct MhdHttpList *httpd;
614 * DLL of active socks requests.
616 static struct Socks5Request *s5r_head;
619 * DLL of active socks requests.
621 static struct Socks5Request *s5r_tail;
624 * The users local GNS master zone
626 static struct GNUNET_CRYPTO_EccPublicSignKey local_gns_zone;
629 * The users local shorten zone
631 static struct GNUNET_CRYPTO_EccPrivateKey local_shorten_zone;
634 * Is shortening enabled?
636 static int do_shorten;
639 * The CA for SSL certificate generation
641 static struct ProxyCA proxy_ca;
644 * Response we return on cURL failures.
646 static struct MHD_Response *curl_failure_response;
649 * Connection to identity service.
651 static struct GNUNET_IDENTITY_Handle *identity;
654 * Request for our ego.
656 static struct GNUNET_IDENTITY_Operation *id_op;
661 static const struct GNUNET_CONFIGURATION_Handle *cfg;
664 /* ************************* Global helpers ********************* */
668 * Clean up s5r handles.
670 * @param s5r the handle to destroy
673 cleanup_s5r (struct Socks5Request *s5r)
675 if (NULL != s5r->curl)
677 curl_multi_remove_handle (curl_multi, s5r->curl);
678 curl_easy_cleanup (s5r->curl);
681 curl_slist_free_all (s5r->headers);
682 if (NULL != s5r->response)
683 MHD_destroy_response (s5r->response);
684 if (GNUNET_SCHEDULER_NO_TASK != s5r->rtask)
685 GNUNET_SCHEDULER_cancel (s5r->rtask);
686 if (GNUNET_SCHEDULER_NO_TASK != s5r->timeout_task)
687 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
688 if (GNUNET_SCHEDULER_NO_TASK != s5r->wtask)
689 GNUNET_SCHEDULER_cancel (s5r->wtask);
690 if (NULL != s5r->gns_lookup)
691 GNUNET_GNS_lookup_cancel (s5r->gns_lookup);
692 if (NULL != s5r->sock)
694 if (SOCKS5_SOCKET_WITH_MHD == s5r->state)
695 GNUNET_NETWORK_socket_free_memory_only_ (s5r->sock);
697 GNUNET_NETWORK_socket_close (s5r->sock);
699 GNUNET_CONTAINER_DLL_remove (s5r_head,
702 GNUNET_free_non_null (s5r->domain);
703 GNUNET_free_non_null (s5r->leho);
704 GNUNET_free_non_null (s5r->url);
710 * Run MHD now, we have extra data ready for the callback.
712 * @param hd the daemon to run now.
715 run_mhd_now (struct MhdHttpList *hd);
718 /* ************************* HTTP handling with cURL *********************** */
722 * Callback for MHD response generation. This function is called from
723 * MHD whenever MHD expects to get data back. Copies data from the
724 * io_buf, if available.
726 * @param cls closure with our `struct Socks5Request`
727 * @param pos in buffer
728 * @param buf where to copy data
729 * @param max available space in @a buf
730 * @return number of bytes written to @a buf
733 mhd_content_cb (void *cls,
738 struct Socks5Request *s5r = cls;
739 size_t bytes_to_copy;
741 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
742 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
744 /* we're still not done with the upload, do not yet
745 start the download, the IO buffer is still full
747 return 0; /* not yet ready for data download */
749 bytes_to_copy = GNUNET_MIN (max,
751 if ( (0 == bytes_to_copy) &&
752 (SOCKS5_SOCKET_DOWNLOAD_DONE != s5r->state) )
753 return 0; /* more data later */
754 if ( (0 == bytes_to_copy) &&
755 (SOCKS5_SOCKET_DOWNLOAD_DONE == s5r->state) )
756 return MHD_CONTENT_READER_END_OF_STREAM;
757 memcpy (buf, s5r->io_buf, bytes_to_copy);
758 memmove (s5r->io_buf,
759 &s5r->io_buf[bytes_to_copy],
760 s5r->io_len - bytes_to_copy);
761 s5r->io_len -= bytes_to_copy;
762 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
763 return bytes_to_copy;
768 * Check that the website has presented us with a valid SSL certificate.
769 * The certificate must either match the domain name or the LEHO name
770 * (or, if available, the TLSA record).
772 * @param s5r request to check for.
773 * @return #GNUNET_OK if the certificate is valid
776 check_ssl_certificate (struct Socks5Request *s5r)
779 struct curl_slist *to_info;
780 struct curl_certinfo *to_certinfo;
783 struct curl_slist *slist;
787 curl_easy_getinfo (s5r->curl,
790 return GNUNET_SYSERR;
791 /* FIXME: for now, we just output the certs to stderr, we should
792 check them against LEHO / TLSA record information here! (#3038) */
793 if(NULL != ptr.to_info)
795 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
797 ptr.to_certinfo->num_of_certs);
798 for (i = 0; i < ptr.to_certinfo->num_of_certs; i++)
800 for (slist = ptr.to_certinfo->certinfo[i]; NULL != slist; slist = slist->next)
801 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
802 "Certificate #%d: %s\n",
813 * We're getting an HTTP response header from cURL. Convert it to the
814 * MHD response headers. Mostly copies the headers, but makes special
815 * adjustments to "Set-Cookie" and "Location" headers as those may need
816 * to be changed from the LEHO to the domain the browser expects.
818 * @param buffer curl buffer with a single line of header data; not 0-terminated!
819 * @param size curl blocksize
820 * @param nmemb curl blocknumber
821 * @param cls our `struct Socks5Request *`
822 * @return size of processed bytes
825 curl_check_hdr (void *buffer, size_t size, size_t nmemb, void *cls)
827 struct Socks5Request *s5r = cls;
828 size_t bytes = size * nmemb;
830 const char *hdr_type;
831 const char *cookie_domain;
834 char *new_cookie_hdr;
837 size_t delta_cdomain;
841 if (NULL == s5r->response)
843 /* first, check SSL certificate */
844 if ( (HTTPS_PORT == s5r->port) &&
845 (GNUNET_OK != check_ssl_certificate (s5r)) )
848 GNUNET_break (CURLE_OK ==
849 curl_easy_getinfo (s5r->curl,
850 CURLINFO_RESPONSE_CODE,
852 s5r->response_code = resp_code;
853 s5r->response = MHD_create_response_from_callback (MHD_SIZE_UNKNOWN,
858 if (NULL != s5r->leho)
862 GNUNET_asprintf (&cors_hdr,
863 (HTTPS_PORT == s5r->port)
868 GNUNET_break (MHD_YES ==
869 MHD_add_response_header (s5r->response,
870 MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN,
872 GNUNET_free (cors_hdr);
874 /* force connection to be closed after each request, as we
875 do not support HTTP pipelining */
876 GNUNET_break (MHD_YES ==
877 MHD_add_response_header (s5r->response,
878 MHD_HTTP_HEADER_CONNECTION,
882 ndup = GNUNET_strndup (buffer, bytes);
883 hdr_type = strtok (ndup, ":");
884 if (NULL == hdr_type)
889 hdr_val = strtok (NULL, "");
898 /* custom logic for certain header types */
899 new_cookie_hdr = NULL;
900 if (0 == strcasecmp (hdr_type,
901 MHD_HTTP_HEADER_SET_COOKIE))
903 new_cookie_hdr = GNUNET_malloc (strlen (hdr_val) +
904 strlen (s5r->domain) + 1);
906 domain_matched = GNUNET_NO; /* make sure we match domain at most once */
907 for (tok = strtok (hdr_val, ";"); NULL != tok; tok = strtok (NULL, ";"))
909 if ( (0 == strncasecmp (tok, " domain", strlen (" domain"))) &&
910 (GNUNET_NO == domain_matched) )
912 domain_matched = GNUNET_YES;
913 cookie_domain = tok + strlen (" domain") + 1;
914 if (strlen (cookie_domain) < strlen (s5r->leho))
916 delta_cdomain = strlen (s5r->leho) - strlen (cookie_domain);
917 if (0 == strcasecmp (cookie_domain, s5r->leho + delta_cdomain))
919 offset += sprintf (new_cookie_hdr + offset,
925 else if (0 == strcmp (cookie_domain, s5r->leho))
927 offset += sprintf (new_cookie_hdr + offset,
932 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
933 _("Cookie domain `%s' supplied by server is invalid\n"),
936 memcpy (new_cookie_hdr + offset, tok, strlen (tok));
937 offset += strlen (tok);
938 new_cookie_hdr[offset++] = ';';
940 hdr_val = new_cookie_hdr;
944 if (0 == strcasecmp (MHD_HTTP_HEADER_LOCATION, hdr_type))
948 GNUNET_asprintf (&leho_host,
949 (HTTPS_PORT != s5r->port)
953 if (0 == strncmp (leho_host,
957 GNUNET_asprintf (&new_location,
959 (HTTPS_PORT != s5r->port)
963 hdr_val + strlen (leho_host));
964 hdr_val = new_location;
966 GNUNET_free (leho_host);
968 GNUNET_break (MHD_YES ==
969 MHD_add_response_header (s5r->response,
973 GNUNET_free_non_null (new_cookie_hdr);
974 GNUNET_free_non_null (new_location);
980 * Handle response payload data from cURL. Copies it into our `io_buf` to make
981 * it available to MHD.
983 * @param ptr pointer to the data
984 * @param size number of blocks of data
985 * @param nmemb blocksize
986 * @param ctx our `struct Socks5Request *`
987 * @return number of bytes handled
990 curl_download_cb (void *ptr, size_t size, size_t nmemb, void* ctx)
992 struct Socks5Request *s5r = ctx;
993 size_t total = size * nmemb;
995 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
996 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
998 /* we're still not done with the upload, do not yet
999 start the download, the IO buffer is still full
1000 with upload data. */
1001 return CURL_WRITEFUNC_PAUSE; /* not yet ready for data download */
1003 if (sizeof (s5r->io_buf) - s5r->io_len < total)
1004 return CURL_WRITEFUNC_PAUSE; /* not enough space */
1005 memcpy (&s5r->io_buf[s5r->io_len],
1008 s5r->io_len += total;
1009 if (s5r->io_len == total)
1010 run_mhd_now (s5r->hd);
1016 * cURL callback for uploaded (PUT/POST) data. Copies it into our `io_buf`
1017 * to make it available to MHD.
1019 * @param buf where to write the data
1020 * @param size number of bytes per member
1021 * @param nmemb number of members available in @a buf
1022 * @param cls our `struct Socks5Request` that generated the data
1023 * @return number of bytes copied to @a buf
1026 curl_upload_cb (void *buf, size_t size, size_t nmemb, void *cls)
1028 struct Socks5Request *s5r = cls;
1029 size_t len = size * nmemb;
1032 if ( (0 == s5r->io_len) &&
1033 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1034 return CURL_READFUNC_PAUSE;
1035 if ( (0 == s5r->io_len) &&
1036 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1038 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1039 return 0; /* upload finished, can now download */
1041 if ( (SOCKS5_SOCKET_UPLOAD_STARTED != s5r->state) ||
1042 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1045 return CURL_READFUNC_ABORT;
1047 to_copy = GNUNET_MIN (s5r->io_len,
1049 memcpy (buf, s5r->io_buf, to_copy);
1050 memmove (s5r->io_buf,
1051 &s5r->io_buf[to_copy],
1052 s5r->io_len - to_copy);
1053 s5r->io_len -= to_copy;
1054 if (s5r->io_len + to_copy == sizeof (s5r->io_buf))
1055 run_mhd_now (s5r->hd); /* got more space for upload now */
1060 /* ************************** main loop of cURL interaction ****************** */
1064 * Task that is run when we are ready to receive more data
1067 * @param cls closure
1068 * @param tc task context
1071 curl_task_download (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
1075 * Ask cURL for the select() sets and schedule cURL operations.
1078 curl_download_prepare ()
1085 struct GNUNET_NETWORK_FDSet *grs;
1086 struct GNUNET_NETWORK_FDSet *gws;
1088 struct GNUNET_TIME_Relative rtime;
1090 if (GNUNET_SCHEDULER_NO_TASK != curl_download_task)
1092 GNUNET_SCHEDULER_cancel (curl_download_task);
1093 curl_download_task = GNUNET_SCHEDULER_NO_TASK;
1099 if (CURLM_OK != (mret = curl_multi_fdset (curl_multi, &rs, &ws, &es, &max)))
1101 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1102 "%s failed at %s:%d: `%s'\n",
1103 "curl_multi_fdset", __FILE__, __LINE__,
1104 curl_multi_strerror (mret));
1108 GNUNET_break (CURLM_OK == curl_multi_timeout (curl_multi, &to));
1110 rtime = GNUNET_TIME_UNIT_FOREVER_REL;
1112 rtime = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, to);
1115 grs = GNUNET_NETWORK_fdset_create ();
1116 gws = GNUNET_NETWORK_fdset_create ();
1117 GNUNET_NETWORK_fdset_copy_native (grs, &rs, max + 1);
1118 GNUNET_NETWORK_fdset_copy_native (gws, &ws, max + 1);
1119 curl_download_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1122 &curl_task_download, curl_multi);
1123 GNUNET_NETWORK_fdset_destroy (gws);
1124 GNUNET_NETWORK_fdset_destroy (grs);
1128 curl_download_task = GNUNET_SCHEDULER_add_delayed (rtime,
1129 &curl_task_download,
1136 * Task that is run when we are ready to receive more data from curl.
1138 * @param cls closure, NULL
1139 * @param tc task context
1142 curl_task_download (void *cls,
1143 const struct GNUNET_SCHEDULER_TaskContext *tc)
1147 struct CURLMsg *msg;
1149 struct Socks5Request *s5r;
1151 curl_download_task = GNUNET_SCHEDULER_NO_TASK;
1155 mret = curl_multi_perform (curl_multi, &running);
1156 while (NULL != (msg = curl_multi_info_read (curl_multi, &msgnum)))
1158 GNUNET_break (CURLE_OK ==
1159 curl_easy_getinfo (msg->easy_handle,
1170 /* documentation says this is not used */
1174 switch (msg->data.result)
1177 case CURLE_GOT_NOTHING:
1178 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1179 "CURL download completed.\n");
1180 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1181 run_mhd_now (s5r->hd);
1184 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1185 "Download curl failed: %s\n",
1186 curl_easy_strerror (msg->data.result));
1187 /* FIXME: indicate error somehow? close MHD connection badly as well? */
1188 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1189 run_mhd_now (s5r->hd);
1192 GNUNET_break (NULL != s5r->response);
1193 curl_multi_remove_handle (curl_multi, s5r->curl);
1194 curl_easy_cleanup (s5r->curl);
1198 /* documentation says this is not used */
1202 /* unexpected status code */
1207 } while (mret == CURLM_CALL_MULTI_PERFORM);
1208 if (CURLM_OK != mret)
1209 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1210 "%s failed at %s:%d: `%s'\n",
1211 "curl_multi_perform", __FILE__, __LINE__,
1212 curl_multi_strerror (mret));
1215 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1216 "Suspending cURL multi loop, no more events pending\n");
1217 return; /* nothing more in progress */
1219 curl_download_prepare();
1223 /* ********************************* MHD response generation ******************* */
1227 * Read HTTP request header field from the request. Copies the fields
1228 * over to the 'headers' that will be given to curl. However, 'Host'
1229 * is substituted with the LEHO if present.
1231 * @param cls our `struct Socks5Request`
1232 * @param kind value kind
1233 * @param key field key
1234 * @param value field value
1235 * @return #MHD_YES to continue to iterate
1238 con_val_iter (void *cls,
1239 enum MHD_ValueKind kind,
1243 struct Socks5Request *s5r = cls;
1246 if ( (0 == strcasecmp (MHD_HTTP_HEADER_HOST, key)) &&
1247 (NULL != s5r->leho) )
1249 GNUNET_asprintf (&hdr,
1253 s5r->headers = curl_slist_append (s5r->headers,
1261 * Main MHD callback for handling requests.
1264 * @param con MHD connection handle
1265 * @param url the url in the request
1266 * @param meth the HTTP method used ("GET", "PUT", etc.)
1267 * @param ver the HTTP version string (i.e. "HTTP/1.1")
1268 * @param upload_data the data being uploaded (excluding HEADERS,
1269 * for a POST that fits into memory and that is encoded
1270 * with a supported encoding, the POST data will NOT be
1271 * given in upload_data and is instead available as
1272 * part of MHD_get_connection_values; very large POST
1273 * data *will* be made available incrementally in
1275 * @param upload_data_size set initially to the size of the
1276 * @a upload_data provided; the method must update this
1277 * value to the number of bytes NOT processed;
1278 * @param con_cls pointer to location where we store the 'struct Request'
1279 * @return #MHD_YES if the connection was handled successfully,
1280 * #MHD_NO if the socket must be closed due to a serious
1281 * error while handling the request
1284 create_response (void *cls,
1285 struct MHD_Connection *con,
1289 const char *upload_data,
1290 size_t *upload_data_size,
1293 /* struct MhdHttpList* hd = cls; */
1294 struct Socks5Request *s5r = *con_cls;
1296 char ipstring[INET6_ADDRSTRLEN];
1297 char ipaddr[INET6_ADDRSTRLEN + 2];
1298 const struct sockaddr *sa;
1299 const struct sockaddr_in *s4;
1300 const struct sockaddr_in6 *s6;
1309 if (NULL == s5r->curl)
1311 /* first time here, initialize curl handle */
1312 sa = (const struct sockaddr *) &s5r->destination_address;
1313 switch (sa->sa_family)
1316 s4 = (const struct sockaddr_in *) &s5r->destination_address;
1317 if (NULL == inet_ntop (AF_INET,
1325 GNUNET_snprintf (ipaddr,
1329 port = ntohs (s4->sin_port);
1332 s6 = (const struct sockaddr_in6 *) &s5r->destination_address;
1333 if (NULL == inet_ntop (AF_INET6,
1341 GNUNET_snprintf (ipaddr,
1345 port = ntohs (s6->sin6_port);
1351 s5r->curl = curl_easy_init ();
1352 if (NULL == s5r->curl)
1353 return MHD_queue_response (con,
1354 MHD_HTTP_INTERNAL_SERVER_ERROR,
1355 curl_failure_response);
1356 curl_easy_setopt (s5r->curl, CURLOPT_HEADERFUNCTION, &curl_check_hdr);
1357 curl_easy_setopt (s5r->curl, CURLOPT_HEADERDATA, s5r);
1358 curl_easy_setopt (s5r->curl, CURLOPT_FOLLOWLOCATION, 0);
1359 curl_easy_setopt (s5r->curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
1360 curl_easy_setopt (s5r->curl, CURLOPT_FAILONERROR, 1); /* not sure we want this */
1361 curl_easy_setopt (s5r->curl, CURLOPT_CONNECTTIMEOUT, 600L);
1362 curl_easy_setopt (s5r->curl, CURLOPT_TIMEOUT, 600L);
1363 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1364 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_CONTENT_DECODING, 0);
1365 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_TRANSFER_DECODING, 0);
1366 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1367 curl_easy_setopt (s5r->curl, CURLOPT_PRIVATE, s5r);
1368 curl_easy_setopt (s5r->curl, CURLOPT_VERBOSE, 1); // FIXME: remove later
1369 GNUNET_asprintf (&curlurl,
1370 (HTTPS_PORT != s5r->port)
1372 : "https://%s:%d%s",
1376 curl_easy_setopt (s5r->curl,
1379 GNUNET_free (curlurl);
1381 if (0 == strcasecmp (meth, MHD_HTTP_METHOD_PUT))
1383 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1384 curl_easy_setopt (s5r->curl, CURLOPT_UPLOAD, 1);
1385 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1386 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1387 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1388 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1390 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_POST))
1392 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1393 curl_easy_setopt (s5r->curl, CURLOPT_POST, 1);
1394 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1395 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1396 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1397 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1399 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_HEAD))
1401 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1402 curl_easy_setopt (s5r->curl, CURLOPT_NOBODY, 1);
1404 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_GET))
1406 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1407 curl_easy_setopt (s5r->curl, CURLOPT_HTTPGET, 1);
1408 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1409 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1413 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1414 _("Unsupported HTTP method `%s'\n"),
1416 curl_easy_cleanup (s5r->curl);
1421 if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_0))
1423 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
1425 else if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_1))
1427 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
1431 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_NONE);
1434 if (HTTPS_PORT == s5r->port)
1436 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);
1437 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYPEER, 1L);
1438 /* Disable cURL checking the hostname, as we will check ourselves
1439 as only we have the domain name or the LEHO or the DANE record */
1440 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYHOST, 0L);
1444 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_NONE);
1447 if (CURLM_OK != curl_multi_add_handle (curl_multi, s5r->curl))
1450 curl_easy_cleanup (s5r->curl);
1454 MHD_get_connection_values (con,
1456 &con_val_iter, s5r);
1457 curl_easy_setopt (s5r->curl, CURLOPT_HTTPHEADER, s5r->headers);
1458 curl_download_prepare ();
1462 /* continuing to process request */
1463 if (0 != *upload_data_size)
1465 left = GNUNET_MIN (*upload_data_size,
1466 sizeof (s5r->io_buf) - s5r->io_len);
1467 memcpy (&s5r->io_buf[s5r->io_len],
1470 s5r->io_len += left;
1471 *upload_data_size -= left;
1472 if (s5r->io_len == left)
1473 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
1474 curl_download_prepare ();
1477 s5r->state = SOCKS5_SOCKET_UPLOAD_DONE;
1478 if (NULL == s5r->response)
1479 return MHD_YES; /* too early to queue response, did not yet get headers from cURL */
1480 return MHD_queue_response (con,
1486 /* ******************** MHD HTTP setup and event loop ******************** */
1490 * Function called when MHD decides that we are done with a connection.
1493 * @param connection connection handle
1494 * @param con_cls value as set by the last call to
1495 * the #MHD_AccessHandlerCallback, should be our `struct Socks5Request`
1496 * @param toe reason for request termination (ignored)
1499 mhd_completed_cb (void *cls,
1500 struct MHD_Connection *connection,
1502 enum MHD_RequestTerminationCode toe)
1504 struct Socks5Request *s5r = *con_cls;
1514 * Function called when MHD first processes an incoming connection.
1515 * Gives us the respective URI information.
1517 * We use this to associate the `struct MHD_Connection` with our
1518 * internal `struct Socks5Request` data structure (by checking
1519 * for matching sockets).
1521 * @param cls the HTTP server handle (a `struct MhdHttpList`)
1522 * @param url the URL that is being requested
1523 * @param connection MHD connection object for the request
1524 * @return the `struct Socks5Request` that this @a connection is for
1527 mhd_log_callback (void *cls,
1529 struct MHD_Connection *connection)
1531 struct Socks5Request *s5r;
1532 const union MHD_ConnectionInfo *ci;
1535 ci = MHD_get_connection_info (connection,
1536 MHD_CONNECTION_INFO_CONNECTION_FD);
1542 sock = ci->connect_fd;
1543 for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
1545 if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
1547 if (NULL != s5r->url)
1552 s5r->url = GNUNET_strdup (url);
1561 * Kill the given MHD daemon.
1563 * @param hd daemon to stop
1566 kill_httpd (struct MhdHttpList *hd)
1568 GNUNET_CONTAINER_DLL_remove (mhd_httpd_head,
1571 GNUNET_free_non_null (hd->domain);
1572 MHD_stop_daemon (hd->daemon);
1573 if (GNUNET_SCHEDULER_NO_TASK != hd->httpd_task)
1574 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1575 GNUNET_free_non_null (hd->proxy_cert);
1583 * Task run whenever HTTP server is idle for too long. Kill it.
1585 * @param cls the `struct MhdHttpList *`
1586 * @param tc sched context
1589 kill_httpd_task (void *cls,
1590 const struct GNUNET_SCHEDULER_TaskContext *tc)
1592 struct MhdHttpList *hd = cls;
1599 * Task run whenever HTTP server operations are pending.
1601 * @param cls the `struct MhdHttpList *` of the daemon that is being run
1602 * @param tc sched context
1605 do_httpd (void *cls,
1606 const struct GNUNET_SCHEDULER_TaskContext *tc);
1610 * Schedule MHD. This function should be called initially when an
1611 * MHD is first getting its client socket, and will then automatically
1612 * always be called later whenever there is work to be done.
1614 * @param hd the daemon to schedule
1617 schedule_httpd (struct MhdHttpList *hd)
1622 struct GNUNET_NETWORK_FDSet *wrs;
1623 struct GNUNET_NETWORK_FDSet *wws;
1626 MHD_UNSIGNED_LONG_LONG timeout;
1627 struct GNUNET_TIME_Relative tv;
1633 if (MHD_YES != MHD_get_fdset (hd->daemon, &rs, &ws, &es, &max))
1638 haveto = MHD_get_timeout (hd->daemon, &timeout);
1639 if (MHD_YES == haveto)
1640 tv.rel_value_us = (uint64_t) timeout * 1000LL;
1642 tv = GNUNET_TIME_UNIT_FOREVER_REL;
1645 wrs = GNUNET_NETWORK_fdset_create ();
1646 wws = GNUNET_NETWORK_fdset_create ();
1647 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
1648 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
1655 if (GNUNET_SCHEDULER_NO_TASK != hd->httpd_task)
1656 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1657 if ( (MHD_YES != haveto) &&
1661 /* daemon is idle, kill after timeout */
1662 hd->httpd_task = GNUNET_SCHEDULER_add_delayed (MHD_CACHE_TIMEOUT,
1669 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1674 GNUNET_NETWORK_fdset_destroy (wrs);
1676 GNUNET_NETWORK_fdset_destroy (wws);
1681 * Task run whenever HTTP server operations are pending.
1683 * @param cls the `struct MhdHttpList` of the daemon that is being run
1684 * @param tc scheduler context
1687 do_httpd (void *cls,
1688 const struct GNUNET_SCHEDULER_TaskContext *tc)
1690 struct MhdHttpList *hd = cls;
1692 hd->httpd_task = GNUNET_SCHEDULER_NO_TASK;
1693 MHD_run (hd->daemon);
1694 schedule_httpd (hd);
1699 * Run MHD now, we have extra data ready for the callback.
1701 * @param hd the daemon to run now.
1704 run_mhd_now (struct MhdHttpList *hd)
1706 if (GNUNET_SCHEDULER_NO_TASK !=
1708 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1709 hd->httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd,
1715 * Read file in filename
1717 * @param filename file to read
1718 * @param size pointer where filesize is stored
1719 * @return NULL on error
1722 load_file (const char* filename,
1729 GNUNET_DISK_file_size (filename, &fsize,
1730 GNUNET_YES, GNUNET_YES))
1732 if (fsize > MAX_PEM_SIZE)
1734 *size = (unsigned int) fsize;
1735 buffer = GNUNET_malloc (*size);
1736 if (fsize != GNUNET_DISK_fn_read (filename, buffer, (size_t) fsize))
1738 GNUNET_free (buffer);
1746 * Load PEM key from file
1748 * @param key where to store the data
1749 * @param keyfile path to the PEM file
1750 * @return #GNUNET_OK on success
1753 load_key_from_file (gnutls_x509_privkey_t key,
1754 const char* keyfile)
1756 gnutls_datum_t key_data;
1759 key_data.data = load_file (keyfile, &key_data.size);
1760 ret = gnutls_x509_privkey_import (key, &key_data,
1761 GNUTLS_X509_FMT_PEM);
1762 if (GNUTLS_E_SUCCESS != ret)
1764 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1765 _("Unable to import private key from file `%s'\n"),
1768 GNUNET_free_non_null (key_data.data);
1769 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
1774 * Load cert from file
1776 * @param crt struct to store data in
1777 * @param certfile path to pem file
1778 * @return #GNUNET_OK on success
1781 load_cert_from_file (gnutls_x509_crt_t crt,
1782 const char* certfile)
1784 gnutls_datum_t cert_data;
1787 cert_data.data = load_file (certfile, &cert_data.size);
1788 ret = gnutls_x509_crt_import (crt, &cert_data,
1789 GNUTLS_X509_FMT_PEM);
1790 if (GNUTLS_E_SUCCESS != ret)
1792 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1793 _("Unable to import certificate %s\n"), certfile);
1795 GNUNET_free_non_null (cert_data.data);
1796 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
1801 * Generate new certificate for specific name
1803 * @param name the subject name to generate a cert for
1804 * @return a struct holding the PEM data, NULL on error
1806 static struct ProxyGNSCertificate *
1807 generate_gns_certificate (const char *name)
1809 unsigned int serial;
1810 size_t key_buf_size;
1811 size_t cert_buf_size;
1812 gnutls_x509_crt_t request;
1815 struct ProxyGNSCertificate *pgc;
1817 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1818 "Generating TLS/SSL certificate for `%s'\n",
1820 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_init (&request));
1821 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_key (request, proxy_ca.key));
1822 pgc = GNUNET_new (struct ProxyGNSCertificate);
1823 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COUNTRY_NAME,
1825 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_ORGANIZATION_NAME,
1826 0, "GNU Name System", 4);
1827 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COMMON_NAME,
1828 0, name, strlen (name));
1829 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_version (request, 3));
1830 gnutls_rnd (GNUTLS_RND_NONCE, &serial, sizeof (serial));
1831 gnutls_x509_crt_set_serial (request,
1834 etime = time (NULL);
1835 tm_data = localtime (&etime);
1836 gnutls_x509_crt_set_activation_time (request,
1839 etime = mktime (tm_data);
1840 gnutls_x509_crt_set_expiration_time (request,
1842 gnutls_x509_crt_sign (request,
1845 key_buf_size = sizeof (pgc->key);
1846 cert_buf_size = sizeof (pgc->cert);
1847 gnutls_x509_crt_export (request, GNUTLS_X509_FMT_PEM,
1848 pgc->cert, &cert_buf_size);
1849 gnutls_x509_privkey_export (proxy_ca.key, GNUTLS_X509_FMT_PEM,
1850 pgc->key, &key_buf_size);
1851 gnutls_x509_crt_deinit (request);
1857 * Lookup (or create) an SSL MHD instance for a particular domain.
1859 * @param domain the domain the SSL daemon has to serve
1860 * @return NULL on errro
1862 static struct MhdHttpList *
1863 lookup_ssl_httpd (const char* domain)
1865 struct MhdHttpList *hd;
1866 struct ProxyGNSCertificate *pgc;
1868 for (hd = mhd_httpd_head; NULL != hd; hd = hd->next)
1869 if (0 == strcmp (hd->domain, domain))
1871 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1872 "Starting fresh MHD HTTPS instance for domain `%s'\n",
1874 pgc = generate_gns_certificate (domain);
1875 hd = GNUNET_new (struct MhdHttpList);
1876 hd->is_ssl = GNUNET_YES;
1877 hd->domain = GNUNET_strdup (domain);
1878 hd->proxy_cert = pgc;
1879 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_SSL | MHD_USE_NO_LISTEN_SOCKET,
1882 &create_response, hd,
1883 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
1884 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
1885 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
1886 MHD_OPTION_HTTPS_MEM_KEY, pgc->key,
1887 MHD_OPTION_HTTPS_MEM_CERT, pgc->cert,
1889 if (NULL == hd->daemon)
1895 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
1903 * Task run when a Socks5Request somehow fails to be associated with
1904 * an MHD connection (i.e. because the client never speaks HTTP after
1905 * the SOCKS5 handshake). Clean up.
1907 * @param cls the `struct Socks5Request *`
1908 * @param tc sched context
1911 timeout_s5r_handshake (void *cls,
1912 const struct GNUNET_SCHEDULER_TaskContext *tc)
1914 struct Socks5Request *s5r = cls;
1916 s5r->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1922 * We're done with the Socks5 protocol, now we need to pass the
1923 * connection data through to the final destination, either
1924 * direct (if the protocol might not be HTTP), or via MHD
1925 * (if the port looks like it should be HTTP).
1927 * @param s5r socks request that has reached the final stage
1930 setup_data_transfer (struct Socks5Request *s5r)
1932 struct MhdHttpList *hd;
1934 const struct sockaddr *addr;
1940 hd = lookup_ssl_httpd (s5r->domain);
1943 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1944 _("Failed to start HTTPS server for `%s'\n"),
1952 GNUNET_assert (NULL == httpd);
1956 fd = GNUNET_NETWORK_get_fd (s5r->sock);
1957 addr = GNUNET_NETWORK_get_addr (s5r->sock);
1958 len = GNUNET_NETWORK_get_addrlen (s5r->sock);
1959 s5r->state = SOCKS5_SOCKET_WITH_MHD;
1960 if (MHD_YES != MHD_add_connection (hd->daemon, fd, addr, len))
1962 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1963 _("Failed to pass client to MHD\n"));
1968 schedule_httpd (hd);
1969 s5r->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_HANDSHAKE_TIMEOUT,
1970 &timeout_s5r_handshake,
1975 /* ********************* SOCKS handling ************************* */
1979 * Write data from buffer to socks5 client, then continue with state machine.
1981 * @param cls the closure with the `struct Socks5Request`
1982 * @param tc scheduler context
1985 do_write (void *cls,
1986 const struct GNUNET_SCHEDULER_TaskContext *tc)
1988 struct Socks5Request *s5r = cls;
1991 s5r->wtask = GNUNET_SCHEDULER_NO_TASK;
1992 len = GNUNET_NETWORK_socket_send (s5r->sock,
1997 /* write error: connection closed, shutdown, etc.; just clean up */
2003 s5r->wbuf_len - len);
2004 s5r->wbuf_len -= len;
2005 if (s5r->wbuf_len > 0)
2007 /* not done writing */
2009 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2015 /* we're done writing, continue with state machine! */
2022 case SOCKS5_REQUEST:
2023 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != s5r->rtask);
2025 case SOCKS5_DATA_TRANSFER:
2026 setup_data_transfer (s5r);
2028 case SOCKS5_WRITE_THEN_CLEANUP:
2039 * Return a server response message indicating a failure to the client.
2041 * @param s5r request to return failure code for
2042 * @param sc status code to return
2045 signal_socks_failure (struct Socks5Request *s5r,
2046 enum Socks5StatusCode sc)
2048 struct Socks5ServerResponseMessage *s_resp;
2050 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2051 memset (s_resp, 0, sizeof (struct Socks5ServerResponseMessage));
2052 s_resp->version = SOCKS_VERSION_5;
2054 s5r->state = SOCKS5_WRITE_THEN_CLEANUP;
2055 if (GNUNET_SCHEDULER_NO_TASK != s5r->wtask)
2057 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2064 * Return a server response message indicating success.
2066 * @param s5r request to return success status message for
2069 signal_socks_success (struct Socks5Request *s5r)
2071 struct Socks5ServerResponseMessage *s_resp;
2073 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2074 s_resp->version = SOCKS_VERSION_5;
2075 s_resp->reply = SOCKS5_STATUS_REQUEST_GRANTED;
2076 s_resp->reserved = 0;
2077 s_resp->addr_type = SOCKS5_AT_IPV4;
2078 /* zero out IPv4 address and port */
2081 sizeof (struct in_addr) + sizeof (uint16_t));
2082 s5r->wbuf_len += sizeof (struct Socks5ServerResponseMessage) +
2083 sizeof (struct in_addr) + sizeof (uint16_t);
2084 if (GNUNET_SCHEDULER_NO_TASK == s5r->wtask)
2086 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2093 * Process GNS results for target domain.
2095 * @param cls the `struct Socks5Request`
2096 * @param rd_count number of records returned
2097 * @param rd record data
2100 handle_gns_result (void *cls,
2102 const struct GNUNET_NAMESTORE_RecordData *rd)
2104 struct Socks5Request *s5r = cls;
2106 const struct GNUNET_NAMESTORE_RecordData *r;
2109 s5r->gns_lookup = NULL;
2111 for (i=0;i<rd_count;i++)
2114 switch (r->record_type)
2116 case GNUNET_DNSPARSER_TYPE_A:
2118 struct sockaddr_in *in;
2120 if (sizeof (struct in_addr) != r->data_size)
2122 GNUNET_break_op (0);
2125 if (GNUNET_YES == got_ip)
2128 GNUNET_NETWORK_test_pf (PF_INET))
2130 got_ip = GNUNET_YES;
2131 in = (struct sockaddr_in *) &s5r->destination_address;
2132 in->sin_family = AF_INET;
2133 memcpy (&in->sin_addr,
2136 in->sin_port = htons (s5r->port);
2137 #if HAVE_SOCKADDR_IN_SIN_LEN
2138 in->sin_len = sizeof (*in);
2142 case GNUNET_DNSPARSER_TYPE_AAAA:
2144 struct sockaddr_in6 *in;
2146 if (sizeof (struct in6_addr) != r->data_size)
2148 GNUNET_break_op (0);
2151 if (GNUNET_YES == got_ip)
2154 GNUNET_NETWORK_test_pf (PF_INET))
2156 /* FIXME: allow user to disable IPv6 per configuration option... */
2157 got_ip = GNUNET_YES;
2158 in = (struct sockaddr_in6 *) &s5r->destination_address;
2159 in->sin6_family = AF_INET6;
2160 memcpy (&in->sin6_addr,
2163 in->sin6_port = htons (s5r->port);
2164 #if HAVE_SOCKADDR_IN_SIN_LEN
2165 in->sin6_len = sizeof (*in);
2169 case GNUNET_NAMESTORE_TYPE_VPN:
2170 GNUNET_break (0); /* should have been translated within GNS */
2172 case GNUNET_NAMESTORE_TYPE_LEHO:
2173 GNUNET_free_non_null (s5r->leho);
2174 s5r->leho = GNUNET_strndup (r->data,
2182 if (GNUNET_YES != got_ip)
2184 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2185 "Name resolution failed to yield useful IP address.\n");
2186 signal_socks_failure (s5r,
2187 SOCKS5_STATUS_GENERAL_FAILURE);
2190 s5r->state = SOCKS5_DATA_TRANSFER;
2191 signal_socks_success (s5r);
2196 * Remove the first @a len bytes from the beginning of the read buffer.
2198 * @param s5r the handle clear the read buffer for
2199 * @param len number of bytes in read buffer to advance
2202 clear_from_s5r_rbuf (struct Socks5Request *s5r,
2205 GNUNET_assert (len <= s5r->rbuf_len);
2208 s5r->rbuf_len - len);
2209 s5r->rbuf_len -= len;
2214 * Read data from incoming Socks5 connection
2216 * @param cls the closure with the `struct Socks5Request`
2217 * @param tc the scheduler context
2220 do_s5r_read (void *cls,
2221 const struct GNUNET_SCHEDULER_TaskContext *tc)
2223 struct Socks5Request *s5r = cls;
2224 const struct Socks5ClientHelloMessage *c_hello;
2225 struct Socks5ServerHelloMessage *s_hello;
2226 const struct Socks5ClientRequestMessage *c_req;
2230 s5r->rtask = GNUNET_SCHEDULER_NO_TASK;
2231 if ( (NULL != tc->read_ready) &&
2232 (GNUNET_NETWORK_fdset_isset (tc->read_ready, s5r->sock)) )
2234 rlen = GNUNET_NETWORK_socket_recv (s5r->sock,
2235 &s5r->rbuf[s5r->rbuf_len],
2236 sizeof (s5r->rbuf) - s5r->rbuf_len);
2239 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2240 "socks5 client disconnected.\n");
2244 s5r->rbuf_len += rlen;
2246 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2249 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2250 "Processing %u bytes of socks data in state %d\n",
2256 c_hello = (const struct Socks5ClientHelloMessage*) &s5r->rbuf;
2257 if ( (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage)) ||
2258 (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods) )
2259 return; /* need more data */
2260 if (SOCKS_VERSION_5 != c_hello->version)
2262 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2263 _("Unsupported socks version %d\n"),
2264 (int) c_hello->version);
2268 clear_from_s5r_rbuf (s5r,
2269 sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods);
2270 GNUNET_assert (0 == s5r->wbuf_len);
2271 s_hello = (struct Socks5ServerHelloMessage *) &s5r->wbuf;
2272 s5r->wbuf_len = sizeof (struct Socks5ServerHelloMessage);
2273 s_hello->version = SOCKS_VERSION_5;
2274 s_hello->auth_method = SOCKS_AUTH_NONE;
2275 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == s5r->wtask);
2276 s5r->wtask = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2279 s5r->state = SOCKS5_REQUEST;
2281 case SOCKS5_REQUEST:
2282 c_req = (const struct Socks5ClientRequestMessage *) &s5r->rbuf;
2283 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage))
2285 switch (c_req->command)
2287 case SOCKS5_CMD_TCP_STREAM:
2291 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2292 _("Unsupported socks command %d\n"),
2293 (int) c_req->command);
2294 signal_socks_failure (s5r,
2295 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED);
2298 switch (c_req->addr_type)
2300 case SOCKS5_AT_IPV4:
2302 const struct in_addr *v4 = (const struct in_addr *) &c_req[1];
2303 const uint16_t *port = (const uint16_t *) &v4[1];
2304 struct sockaddr_in *in;
2306 s5r->port = ntohs (*port);
2307 alen = sizeof (struct in_addr);
2308 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2309 alen + sizeof (uint16_t))
2310 return; /* need more data */
2311 in = (struct sockaddr_in *) &s5r->destination_address;
2312 in->sin_family = AF_INET;
2314 in->sin_port = *port;
2315 #if HAVE_SOCKADDR_IN_SIN_LEN
2316 in->sin_len = sizeof (*in);
2318 s5r->state = SOCKS5_DATA_TRANSFER;
2321 case SOCKS5_AT_IPV6:
2323 const struct in6_addr *v6 = (const struct in6_addr *) &c_req[1];
2324 const uint16_t *port = (const uint16_t *) &v6[1];
2325 struct sockaddr_in6 *in;
2327 s5r->port = ntohs (*port);
2328 alen = sizeof (struct in6_addr);
2329 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2330 alen + sizeof (uint16_t))
2331 return; /* need more data */
2332 in = (struct sockaddr_in6 *) &s5r->destination_address;
2333 in->sin6_family = AF_INET6;
2334 in->sin6_addr = *v6;
2335 in->sin6_port = *port;
2336 #if HAVE_SOCKADDR_IN_SIN_LEN
2337 in->sin6_len = sizeof (*in);
2339 s5r->state = SOCKS5_DATA_TRANSFER;
2342 case SOCKS5_AT_DOMAINNAME:
2344 const uint8_t *dom_len;
2345 const char *dom_name;
2346 const uint16_t *port;
2348 dom_len = (const uint8_t *) &c_req[1];
2349 alen = *dom_len + 1;
2350 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2351 alen + sizeof (uint16_t))
2352 return; /* need more data */
2353 dom_name = (const char *) &dom_len[1];
2354 port = (const uint16_t*) &dom_name[*dom_len];
2355 s5r->domain = GNUNET_strndup (dom_name, *dom_len);
2356 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2357 "Requested connection is to %s:%d\n",
2360 s5r->state = SOCKS5_RESOLVING;
2361 s5r->port = ntohs (*port);
2362 s5r->gns_lookup = GNUNET_GNS_lookup (gns_handle,
2365 GNUNET_DNSPARSER_TYPE_A,
2366 GNUNET_NO /* only cached */,
2367 (GNUNET_YES == do_shorten) ? &local_shorten_zone : NULL,
2373 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2374 _("Unsupported socks address type %d\n"),
2375 (int) c_req->addr_type);
2376 signal_socks_failure (s5r,
2377 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED);
2380 clear_from_s5r_rbuf (s5r,
2381 sizeof (struct Socks5ClientRequestMessage) +
2382 alen + sizeof (uint16_t));
2383 if (0 != s5r->rbuf_len)
2385 /* read more bytes than healthy, why did the client send more!? */
2386 GNUNET_break_op (0);
2387 signal_socks_failure (s5r,
2388 SOCKS5_STATUS_GENERAL_FAILURE);
2391 if (SOCKS5_DATA_TRANSFER == s5r->state)
2393 /* if we are not waiting for GNS resolution, signal success */
2394 signal_socks_success (s5r);
2396 /* We are done reading right now */
2397 GNUNET_SCHEDULER_cancel (s5r->rtask);
2398 s5r->rtask = GNUNET_SCHEDULER_NO_TASK;
2400 case SOCKS5_RESOLVING:
2403 case SOCKS5_DATA_TRANSFER:
2414 * Accept new incoming connections
2416 * @param cls the closure
2417 * @param tc the scheduler context
2420 do_accept (void *cls,
2421 const struct GNUNET_SCHEDULER_TaskContext *tc)
2423 struct GNUNET_NETWORK_Handle *s;
2424 struct Socks5Request *s5r;
2426 ltask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2429 s = GNUNET_NETWORK_socket_accept (lsock, NULL, NULL);
2432 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "accept");
2435 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2436 "Got an inbound connection, waiting for data\n");
2437 s5r = GNUNET_new (struct Socks5Request);
2438 GNUNET_CONTAINER_DLL_insert (s5r_head,
2442 s5r->state = SOCKS5_INIT;
2443 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2449 /* ******************* General / main code ********************* */
2453 * Task run on shutdown
2455 * @param cls closure
2456 * @param tc task context
2459 do_shutdown (void *cls,
2460 const struct GNUNET_SCHEDULER_TaskContext *tc)
2462 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2463 "Shutting down...\n");
2464 while (NULL != mhd_httpd_head)
2465 kill_httpd (mhd_httpd_head);
2468 GNUNET_NETWORK_socket_close (lsock);
2473 GNUNET_IDENTITY_cancel (id_op);
2476 if (NULL != identity)
2478 GNUNET_IDENTITY_disconnect (identity);
2481 if (NULL != curl_multi)
2483 curl_multi_cleanup (curl_multi);
2486 if (NULL != gns_handle)
2488 GNUNET_GNS_disconnect (gns_handle);
2491 if (GNUNET_SCHEDULER_NO_TASK != curl_download_task)
2493 GNUNET_SCHEDULER_cancel (curl_download_task);
2494 curl_download_task = GNUNET_SCHEDULER_NO_TASK;
2496 if (GNUNET_SCHEDULER_NO_TASK != ltask)
2498 GNUNET_SCHEDULER_cancel (ltask);
2499 ltask = GNUNET_SCHEDULER_NO_TASK;
2501 gnutls_x509_crt_deinit (proxy_ca.cert);
2502 gnutls_x509_privkey_deinit (proxy_ca.key);
2503 gnutls_global_deinit ();
2508 * Continue initialization after we have our zone information.
2513 struct MhdHttpList *hd;
2514 struct sockaddr_in sa;
2516 /* Open listen socket for socks proxy */
2517 /* FIXME: support IPv6! */
2518 memset (&sa, 0, sizeof (sa));
2519 sa.sin_family = AF_INET;
2520 sa.sin_port = htons (port);
2521 #if HAVE_SOCKADDR_IN_SIN_LEN
2522 sa.sin_len = sizeof (sa);
2524 lsock = GNUNET_NETWORK_socket_create (AF_INET,
2529 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket");
2530 GNUNET_SCHEDULER_shutdown ();
2534 GNUNET_NETWORK_socket_bind (lsock, (const struct sockaddr *) &sa,
2537 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
2538 GNUNET_SCHEDULER_shutdown ();
2541 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock, 5))
2543 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
2546 ltask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2547 lsock, &do_accept, NULL);
2549 if (0 != curl_global_init (CURL_GLOBAL_WIN32))
2551 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2552 "cURL global init failed!\n");
2553 GNUNET_SCHEDULER_shutdown ();
2556 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2557 "Proxy listens on port %u\n",
2560 /* start MHD daemon for HTTP */
2561 hd = GNUNET_new (struct MhdHttpList);
2562 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_NO_LISTEN_SOCKET,
2565 &create_response, hd,
2566 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
2567 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
2568 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
2570 if (NULL == hd->daemon)
2573 GNUNET_SCHEDULER_shutdown ();
2577 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head, mhd_httpd_tail, hd);
2582 * Method called to inform about the egos of the shorten zone of this peer.
2584 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
2585 * this function is only called ONCE, and 'NULL' being passed in
2586 * @a ego does indicate an error (i.e. name is taken or no default
2587 * value is known). If @a ego is non-NULL and if '*ctx'
2588 * is set in those callbacks, the value WILL be passed to a subsequent
2589 * call to the identity callback of #GNUNET_IDENTITY_connect (if
2590 * that one was not NULL).
2592 * @param cls closure, NULL
2593 * @param ego ego handle
2594 * @param ctx context for application to store data for this ego
2595 * (during the lifetime of this process, initially NULL)
2596 * @param name name assigned by the user for this ego,
2597 * NULL if the user just deleted the ego and it
2598 * must thus no longer be used
2601 identity_shorten_cb (void *cls,
2602 struct GNUNET_IDENTITY_Ego *ego,
2609 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2610 _("No ego configured for `shorten-zone`\n"));
2614 local_shorten_zone = *GNUNET_IDENTITY_ego_get_private_key (ego);
2615 do_shorten = GNUNET_YES;
2622 * Method called to inform about the egos of the master zone of this peer.
2624 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
2625 * this function is only called ONCE, and 'NULL' being passed in
2626 * @a ego does indicate an error (i.e. name is taken or no default
2627 * value is known). If @a ego is non-NULL and if '*ctx'
2628 * is set in those callbacks, the value WILL be passed to a subsequent
2629 * call to the identity callback of #GNUNET_IDENTITY_connect (if
2630 * that one was not NULL).
2632 * @param cls closure, NULL
2633 * @param ego ego handle
2634 * @param ctx context for application to store data for this ego
2635 * (during the lifetime of this process, initially NULL)
2636 * @param name name assigned by the user for this ego,
2637 * NULL if the user just deleted the ego and it
2638 * must thus no longer be used
2641 identity_master_cb (void *cls,
2642 struct GNUNET_IDENTITY_Ego *ego,
2649 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2650 _("No ego configured for `%s`\n"),
2652 GNUNET_SCHEDULER_shutdown ();
2655 GNUNET_IDENTITY_ego_get_public_key (ego,
2657 id_op = GNUNET_IDENTITY_get (identity,
2659 &identity_shorten_cb,
2665 * Main function that will be run
2667 * @param cls closure
2668 * @param args remaining command-line arguments
2669 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
2670 * @param c configuration
2673 run (void *cls, char *const *args, const char *cfgfile,
2674 const struct GNUNET_CONFIGURATION_Handle *c)
2676 char* cafile_cfg = NULL;
2680 if (NULL == (curl_multi = curl_multi_init ()))
2682 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2683 "Failed to create cURL multi handle!\n");
2686 cafile = cafile_opt;
2689 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "gns-proxy",
2693 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
2698 cafile = cafile_cfg;
2700 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2701 "Using %s as CA\n", cafile);
2703 gnutls_global_init ();
2704 gnutls_x509_crt_init (&proxy_ca.cert);
2705 gnutls_x509_privkey_init (&proxy_ca.key);
2707 if ( (GNUNET_OK != load_cert_from_file (proxy_ca.cert, cafile)) ||
2708 (GNUNET_OK != load_key_from_file (proxy_ca.key, cafile)) )
2710 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2711 _("Failed to load SSL/TLS key and certificate from `%s'\n"),
2713 gnutls_x509_crt_deinit (proxy_ca.cert);
2714 gnutls_x509_privkey_deinit (proxy_ca.key);
2715 gnutls_global_deinit ();
2716 GNUNET_free_non_null (cafile_cfg);
2719 GNUNET_free_non_null (cafile_cfg);
2720 if (NULL == (gns_handle = GNUNET_GNS_connect (cfg)))
2722 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2723 "Unable to connect to GNS!\n");
2724 gnutls_x509_crt_deinit (proxy_ca.cert);
2725 gnutls_x509_privkey_deinit (proxy_ca.key);
2726 gnutls_global_deinit ();
2729 identity = GNUNET_IDENTITY_connect (cfg,
2731 id_op = GNUNET_IDENTITY_get (identity,
2733 &identity_master_cb,
2735 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
2736 &do_shutdown, NULL);
2741 * The main function for gnunet-gns-proxy.
2743 * @param argc number of arguments from the command line
2744 * @param argv command line arguments
2745 * @return 0 ok, 1 on error
2748 main (int argc, char *const *argv)
2750 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
2752 gettext_noop ("listen on specified port (default: 7777)"), 1,
2753 &GNUNET_GETOPT_set_ulong, &port},
2754 {'a', "authority", NULL,
2755 gettext_noop ("pem file to use as CA"), 1,
2756 &GNUNET_GETOPT_set_string, &cafile_opt},
2757 GNUNET_GETOPT_OPTION_END
2759 static const char* page =
2760 "<html><head><title>gnunet-gns-proxy</title>"
2761 "</head><body>cURL fail</body></html>";
2764 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
2766 GNUNET_log_setup ("gnunet-gns-proxy", "WARNING", NULL);
2767 curl_failure_response = MHD_create_response_from_buffer (strlen (page),
2769 MHD_RESPMEM_PERSISTENT);
2773 GNUNET_PROGRAM_run (argc, argv, "gnunet-gns-proxy",
2774 _("GNUnet GNS proxy"),
2776 &run, NULL)) ? 0 : 1;
2777 MHD_destroy_response (curl_failure_response);
2778 GNUNET_free_non_null ((char *) argv);
2782 /* end of gnunet-gns-proxy.c */