2 This file is part of GNUnet.
3 Copyright (C) 2012-2018 GNUnet e.V.
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.
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.
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/>.
18 SPDX-License-Identifier: AGPL3.0-or-later
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
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>
39 #include <gnutls/dane.h>
42 #include "gnunet_util_lib.h"
43 #include "gnunet_gns_service.h"
44 #include "gnunet_identity_service.h"
50 * Default Socks5 listen port.
52 #define GNUNET_GNS_PROXY_PORT 7777
55 * Maximum supported length for a URI.
56 * Should die. @deprecated
58 #define MAX_HTTP_URI_LENGTH 2048
61 * Maximum number of DANE records we support
62 * per domain name (and port and protocol).
67 * Size of the buffer for the data upload / download. Must be
68 * enough for curl, thus CURL_MAX_WRITE_SIZE is needed here (16k).
70 #define IO_BUFFERSIZE CURL_MAX_WRITE_SIZE
73 * Size of the read/write buffers for Socks. Uses
74 * 256 bytes for the hostname (at most), plus a few
75 * bytes overhead for the messages.
77 #define SOCKS_BUFFERSIZE (256 + 32)
80 * Port for plaintext HTTP.
87 #define HTTPS_PORT 443
90 * Largest allowed size for a PEM certificate.
92 #define MAX_PEM_SIZE (10 * 1024)
95 * After how long do we clean up unused MHD TLS instances?
97 #define MHD_CACHE_TIMEOUT GNUNET_TIME_relative_multiply ( \
98 GNUNET_TIME_UNIT_MINUTES, 5)
101 * After how long do we clean up Socks5 handles that failed to show any activity
102 * with their respective MHD instance?
104 #define HTTP_HANDSHAKE_TIMEOUT GNUNET_TIME_relative_multiply ( \
105 GNUNET_TIME_UNIT_SECONDS, 15)
111 * @param level log level
112 * @param fun name of curl_easy-function that gave the error
113 * @param rc return code from curl
115 #define LOG_CURL_EASY(level, fun, rc) \
117 _ ("%s failed at %s:%d: `%s'\n"), \
121 curl_easy_strerror (rc))
124 /* *************** Socks protocol definitions (move to TUN?) ****************** */
127 * Which SOCKS version do we speak?
129 #define SOCKS_VERSION_5 0x05
132 * Flag to set for 'no authentication'.
134 #define SOCKS_AUTH_NONE 0
138 * Commands in Socks5.
143 * Establish TCP/IP stream.
145 SOCKS5_CMD_TCP_STREAM = 1,
148 * Establish TCP port binding.
150 SOCKS5_CMD_TCP_PORT = 2,
153 * Establish UDP port binding.
155 SOCKS5_CMD_UDP_PORT = 3
160 * Address types in Socks5.
162 enum Socks5AddressType
172 SOCKS5_AT_DOMAINNAME = 3,
182 * Status codes in Socks5 response.
184 enum Socks5StatusCode
186 SOCKS5_STATUS_REQUEST_GRANTED = 0,
187 SOCKS5_STATUS_GENERAL_FAILURE = 1,
188 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE = 2,
189 SOCKS5_STATUS_NETWORK_UNREACHABLE = 3,
190 SOCKS5_STATUS_HOST_UNREACHABLE = 4,
191 SOCKS5_STATUS_CONNECTION_REFUSED_BY_HOST = 5,
192 SOCKS5_STATUS_TTL_EXPIRED = 6,
193 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED = 7,
194 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED = 8
199 * Client hello in Socks5 protocol.
201 struct Socks5ClientHelloMessage
204 * Should be #SOCKS_VERSION_5.
209 * How many authentication methods does the client support.
211 uint8_t num_auth_methods;
213 /* followed by supported authentication methods, 1 byte per method */
218 * Server hello in Socks5 protocol.
220 struct Socks5ServerHelloMessage
223 * Should be #SOCKS_VERSION_5.
228 * Chosen authentication method, for us always #SOCKS_AUTH_NONE,
229 * which skips the authentication step.
236 * Client socks request in Socks5 protocol.
238 struct Socks5ClientRequestMessage
241 * Should be #SOCKS_VERSION_5.
246 * Command code, we only uspport #SOCKS5_CMD_TCP_STREAM.
251 * Reserved, always zero.
256 * Address type, an `enum Socks5AddressType`.
261 * Followed by either an ip4/ipv6 address or a domain name with a
262 * length field (uint8_t) in front (depending on @e addr_type).
263 * followed by port number in network byte order (uint16_t).
269 * Server response to client requests in Socks5 protocol.
271 struct Socks5ServerResponseMessage
274 * Should be #SOCKS_VERSION_5.
279 * Status code, an `enum Socks5StatusCode`
289 * Address type, an `enum Socks5AddressType`.
294 * Followed by either an ip4/ipv6 address or a domain name with a
295 * length field (uint8_t) in front (depending on @e addr_type).
296 * followed by port number in network byte order (uint16_t).
302 /* *********************** Datastructures for HTTP handling ****************** */
305 * A structure for CA cert/key
312 gnutls_x509_crt_t cert;
317 gnutls_x509_privkey_t key;
322 * Structure for GNS certificates
324 struct ProxyGNSCertificate
327 * The certificate as PEM
329 char cert[MAX_PEM_SIZE];
332 * The private key as PEM
334 char key[MAX_PEM_SIZE];
340 * A structure for all running Httpds
347 struct MhdHttpList *prev;
352 struct MhdHttpList *next;
355 * the domain name to server (only important for TLS)
362 struct MHD_Daemon *daemon;
365 * Optional proxy certificate used
367 struct ProxyGNSCertificate *proxy_cert;
372 struct GNUNET_SCHEDULER_Task *httpd_task;
375 * is this an ssl daemon?
381 /* ***************** Datastructures for Socks handling **************** */
390 * We're waiting to get the client hello.
395 * We're waiting to get the initial request.
400 * We are currently resolving the destination.
405 * We're in transfer mode.
407 SOCKS5_DATA_TRANSFER,
410 * Finish writing the write buffer, then clean up.
412 SOCKS5_WRITE_THEN_CLEANUP,
415 * Socket has been passed to MHD, do not close it anymore.
417 SOCKS5_SOCKET_WITH_MHD,
420 * We've started receiving upload data from MHD.
422 SOCKS5_SOCKET_UPLOAD_STARTED,
425 * We've finished receiving upload data from MHD.
427 SOCKS5_SOCKET_UPLOAD_DONE,
430 * We've finished uploading data via CURL and can now download.
432 SOCKS5_SOCKET_DOWNLOAD_STARTED,
435 * We've finished receiving download data from cURL.
437 SOCKS5_SOCKET_DOWNLOAD_DONE
444 struct HttpResponseHeader
449 struct HttpResponseHeader *next;
454 struct HttpResponseHeader *prev;
468 * A structure for socks requests
475 struct Socks5Request *next;
480 struct Socks5Request *prev;
485 struct GNUNET_NETWORK_Handle *sock;
488 * Handle to GNS lookup, during #SOCKS5_RESOLVING phase.
490 struct GNUNET_GNS_LookupWithTldRequest *gns_lookup;
493 * Client socket read task
495 struct GNUNET_SCHEDULER_Task *rtask;
498 * Client socket write task
500 struct GNUNET_SCHEDULER_Task *wtask;
505 struct GNUNET_SCHEDULER_Task *timeout_task;
510 char rbuf[SOCKS_BUFFERSIZE];
515 char wbuf[SOCKS_BUFFERSIZE];
518 * Buffer we use for moving data between MHD and curl (in both directions).
520 char io_buf[IO_BUFFERSIZE];
523 * MHD HTTP instance handling this request, NULL for none.
525 struct MhdHttpList *hd;
528 * MHD connection for this request.
530 struct MHD_Connection *con;
533 * MHD response object for this request.
535 struct MHD_Response *response;
538 * the domain name to server (only important for TLS)
543 * DNS Legacy Host Name as given by GNS, NULL if not given.
548 * Payload of the DANE records encountered.
550 char *dane_data[MAX_DANES + 1];
563 * HTTP request headers for the curl request.
565 struct curl_slist *headers;
568 * DNS->IP mappings resolved through GNS
570 struct curl_slist *hosts;
573 * HTTP response code to give to MHD for the response.
575 unsigned int response_code;
578 * Number of bytes in @e dane_data.
580 int dane_data_len[MAX_DANES + 1];
583 * Number of entries used in @e dane_data_len
586 unsigned int num_danes;
589 * Number of bytes already in read buffer
594 * Number of bytes already in write buffer
599 * Number of bytes already in the IO buffer.
604 * Once known, what's the target address for the connection?
606 struct sockaddr_storage destination_address;
611 enum SocksPhase state;
614 * Desired destination port.
619 * Headers from response
621 struct HttpResponseHeader *header_head;
624 * Headers from response
626 struct HttpResponseHeader *header_tail;
629 * X.509 Certificate status
634 * Was the hostname resolved via GNS?
639 * This is (probably) a TLS connection
644 * Did we suspend MHD processing?
649 * Did we pause CURL processing?
656 /* *********************** Globals **************************** */
659 * The address to bind to
661 static in_addr_t address;
664 * The IPv6 address to bind to
666 static struct in6_addr address6;
669 * The port the proxy is running on (default 7777)
671 static uint16_t port = GNUNET_GNS_PROXY_PORT;
674 * The CA file (pem) to use for the proxy CA
676 static char *cafile_opt;
679 * The listen socket of the proxy for IPv4
681 static struct GNUNET_NETWORK_Handle *lsock4;
684 * The listen socket of the proxy for IPv6
686 static struct GNUNET_NETWORK_Handle *lsock6;
689 * The listen task ID for IPv4
691 static struct GNUNET_SCHEDULER_Task *ltask4;
694 * The listen task ID for IPv6
696 static struct GNUNET_SCHEDULER_Task *ltask6;
699 * The cURL download task (curl multi API).
701 static struct GNUNET_SCHEDULER_Task *curl_download_task;
704 * The cURL multi handle
706 static CURLM *curl_multi;
709 * Handle to the GNS service
711 static struct GNUNET_GNS_Handle *gns_handle;
716 static int disable_v6;
719 * DLL for http/https daemons
721 static struct MhdHttpList *mhd_httpd_head;
724 * DLL for http/https daemons
726 static struct MhdHttpList *mhd_httpd_tail;
729 * Daemon for HTTP (we have one per X.509 certificate, and then one for
730 * all HTTP connections; this is the one for HTTP, not HTTPS).
732 static struct MhdHttpList *httpd;
735 * DLL of active socks requests.
737 static struct Socks5Request *s5r_head;
740 * DLL of active socks requests.
742 static struct Socks5Request *s5r_tail;
745 * The CA for X.509 certificate generation
747 static struct ProxyCA proxy_ca;
750 * Response we return on cURL failures.
752 static struct MHD_Response *curl_failure_response;
757 static const struct GNUNET_CONFIGURATION_Handle *cfg;
760 /* ************************* Global helpers ********************* */
764 * Run MHD now, we have extra data ready for the callback.
766 * @param hd the daemon to run now.
769 run_mhd_now (struct MhdHttpList *hd);
773 * Clean up s5r handles.
775 * @param s5r the handle to destroy
778 cleanup_s5r (struct Socks5Request *s5r)
780 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
781 "Cleaning up socks request\n");
782 if (NULL != s5r->curl)
784 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
785 "Cleaning up cURL handle\n");
786 curl_multi_remove_handle (curl_multi,
788 curl_easy_cleanup (s5r->curl);
793 s5r->suspended = GNUNET_NO;
794 MHD_resume_connection (s5r->con);
796 curl_slist_free_all (s5r->headers);
797 if (NULL != s5r->hosts)
799 curl_slist_free_all (s5r->hosts);
801 if ((NULL != s5r->response) &&
802 (curl_failure_response != s5r->response))
804 MHD_destroy_response (s5r->response);
805 s5r->response = NULL;
807 if (NULL != s5r->rtask)
809 GNUNET_SCHEDULER_cancel (s5r->rtask);
812 if (NULL != s5r->timeout_task)
814 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
815 s5r->timeout_task = NULL;
817 if (NULL != s5r->wtask)
819 GNUNET_SCHEDULER_cancel (s5r->wtask);
822 if (NULL != s5r->gns_lookup)
824 GNUNET_GNS_lookup_with_tld_cancel (s5r->gns_lookup);
825 s5r->gns_lookup = NULL;
827 if (NULL != s5r->sock)
829 if (SOCKS5_SOCKET_WITH_MHD <= s5r->state)
830 GNUNET_NETWORK_socket_free_memory_only_ (s5r->sock);
832 GNUNET_NETWORK_socket_close (s5r->sock);
835 GNUNET_CONTAINER_DLL_remove (s5r_head,
838 GNUNET_free_non_null (s5r->domain);
839 GNUNET_free_non_null (s5r->leho);
840 GNUNET_free_non_null (s5r->url);
841 for (unsigned int i = 0; i < s5r->num_danes; i++)
842 GNUNET_free (s5r->dane_data[i]);
847 /* ************************* HTTP handling with cURL *********************** */
850 curl_download_prepare ();
854 * Callback for MHD response generation. This function is called from
855 * MHD whenever MHD expects to get data back. Copies data from the
856 * io_buf, if available.
858 * @param cls closure with our `struct Socks5Request`
859 * @param pos in buffer
860 * @param buf where to copy data
861 * @param max available space in @a buf
862 * @return number of bytes written to @a buf
865 mhd_content_cb (void *cls,
870 struct Socks5Request *s5r = cls;
871 size_t bytes_to_copy;
873 if ((SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
874 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state))
876 /* we're still not done with the upload, do not yet
877 start the download, the IO buffer is still full
879 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
880 "Pausing MHD download %s%s, not yet ready for download\n",
883 return 0; /* not yet ready for data download */
885 bytes_to_copy = GNUNET_MIN (max,
887 if ((0 == bytes_to_copy) &&
888 (SOCKS5_SOCKET_DOWNLOAD_DONE != s5r->state))
890 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
891 "Pausing MHD download %s%s, no data available\n",
894 if (NULL != s5r->curl)
896 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
897 "Continuing CURL interaction for %s%s\n",
900 if (GNUNET_YES == s5r->curl_paused)
902 s5r->curl_paused = GNUNET_NO;
903 curl_easy_pause (s5r->curl,
906 curl_download_prepare ();
908 if (GNUNET_NO == s5r->suspended)
910 MHD_suspend_connection (s5r->con);
911 s5r->suspended = GNUNET_YES;
913 return 0; /* more data later */
915 if ((0 == bytes_to_copy) &&
916 (SOCKS5_SOCKET_DOWNLOAD_DONE == s5r->state))
918 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
919 "Completed MHD download %s%s\n",
922 return MHD_CONTENT_READER_END_OF_STREAM;
924 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
925 "Writing %llu/%llu bytes to %s%s\n",
926 (unsigned long long) bytes_to_copy,
927 (unsigned long long) s5r->io_len,
933 memmove (s5r->io_buf,
934 &s5r->io_buf[bytes_to_copy],
935 s5r->io_len - bytes_to_copy);
936 s5r->io_len -= bytes_to_copy;
937 if ((NULL != s5r->curl) &&
938 (GNUNET_YES == s5r->curl_paused))
940 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
941 "Continuing CURL interaction for %s%s\n",
944 s5r->curl_paused = GNUNET_NO;
945 curl_easy_pause (s5r->curl,
948 return bytes_to_copy;
953 * Check that the website has presented us with a valid X.509 certificate.
954 * The certificate must either match the domain name or the LEHO name
955 * (or, if available, the TLSA record).
957 * @param s5r request to check for.
958 * @return #GNUNET_OK if the certificate is valid
961 check_ssl_certificate (struct Socks5Request *s5r)
963 unsigned int cert_list_size;
964 const gnutls_datum_t *chainp;
965 const struct curl_tlssessioninfo *tlsinfo;
966 char certdn[GNUNET_DNSPARSER_MAX_NAME_LENGTH + 3];
968 gnutls_x509_crt_t x509_cert;
972 s5r->ssl_checked = GNUNET_YES;
973 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
974 "Checking X.509 certificate\n");
976 curl_easy_getinfo (s5r->curl,
977 CURLINFO_TLS_SESSION,
979 return GNUNET_SYSERR;
980 if (CURLSSLBACKEND_GNUTLS != tlsinfo->backend)
982 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
983 _ ("Unsupported CURL TLS backend %d\n"),
985 return GNUNET_SYSERR;
987 chainp = gnutls_certificate_get_peers (tlsinfo->internals,
990 (0 == cert_list_size))
991 return GNUNET_SYSERR;
993 size = sizeof(certdn);
994 /* initialize an X.509 certificate structure. */
995 gnutls_x509_crt_init (&x509_cert);
996 gnutls_x509_crt_import (x509_cert,
998 GNUTLS_X509_FMT_DER);
1000 if (0 != (rc = gnutls_x509_crt_get_dn_by_oid (x509_cert,
1001 GNUTLS_OID_X520_COMMON_NAME,
1002 0, /* the first and only one */
1003 0 /* no DER encoding */,
1007 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1008 _ ("Failed to fetch CN from cert: %s\n"),
1009 gnutls_strerror (rc));
1010 gnutls_x509_crt_deinit (x509_cert);
1011 return GNUNET_SYSERR;
1013 /* check for TLSA/DANE records */
1014 #if HAVE_GNUTLS_DANE
1015 if (0 != s5r->num_danes)
1017 dane_state_t dane_state;
1018 dane_query_t dane_query;
1019 unsigned int verify;
1021 /* FIXME: add flags to gnutls to NOT read UNBOUND_ROOT_KEY_FILE here! */
1022 if (0 != (rc = dane_state_init (&dane_state,
1023 #ifdef DANE_F_IGNORE_DNSSEC
1024 DANE_F_IGNORE_DNSSEC |
1026 DANE_F_IGNORE_LOCAL_RESOLVER)))
1028 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1029 _ ("Failed to initialize DANE: %s\n"),
1030 dane_strerror (rc));
1031 gnutls_x509_crt_deinit (x509_cert);
1032 return GNUNET_SYSERR;
1034 s5r->dane_data[s5r->num_danes] = NULL;
1035 s5r->dane_data_len[s5r->num_danes] = 0;
1036 if (0 != (rc = dane_raw_tlsa (dane_state,
1043 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1044 _ ("Failed to parse DANE record: %s\n"),
1045 dane_strerror (rc));
1046 dane_state_deinit (dane_state);
1047 gnutls_x509_crt_deinit (x509_cert);
1048 return GNUNET_SYSERR;
1050 if (0 != (rc = dane_verify_crt_raw (dane_state,
1053 gnutls_certificate_type_get (
1054 tlsinfo->internals),
1059 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1060 _ ("Failed to verify TLS connection using DANE: %s\n"),
1061 dane_strerror (rc));
1062 dane_query_deinit (dane_query);
1063 dane_state_deinit (dane_state);
1064 gnutls_x509_crt_deinit (x509_cert);
1065 return GNUNET_SYSERR;
1069 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1071 "Failed DANE verification failed with GnuTLS verify status code: %u\n"),
1073 dane_query_deinit (dane_query);
1074 dane_state_deinit (dane_state);
1075 gnutls_x509_crt_deinit (x509_cert);
1076 return GNUNET_SYSERR;
1078 dane_query_deinit (dane_query);
1079 dane_state_deinit (dane_state);
1085 /* try LEHO or ordinary domain name X509 verification */
1087 if (NULL != s5r->leho)
1091 if (0 == (rc = gnutls_x509_crt_check_hostname (x509_cert,
1094 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1096 "TLS certificate subject name (%s) does not match `%s': %d\n"),
1100 gnutls_x509_crt_deinit (x509_cert);
1101 return GNUNET_SYSERR;
1106 /* we did not even have the domain name!? */
1108 return GNUNET_SYSERR;
1111 gnutls_x509_crt_deinit (x509_cert);
1117 * We're getting an HTTP response header from cURL. Convert it to the
1118 * MHD response headers. Mostly copies the headers, but makes special
1119 * adjustments to "Set-Cookie" and "Location" headers as those may need
1120 * to be changed from the LEHO to the domain the browser expects.
1122 * @param buffer curl buffer with a single line of header data; not 0-terminated!
1123 * @param size curl blocksize
1124 * @param nmemb curl blocknumber
1125 * @param cls our `struct Socks5Request *`
1126 * @return size of processed bytes
1129 curl_check_hdr (void *buffer,
1134 struct Socks5Request *s5r = cls;
1135 struct HttpResponseHeader *header;
1136 size_t bytes = size * nmemb;
1138 const char *hdr_type;
1139 const char *cookie_domain;
1141 char *new_cookie_hdr;
1144 size_t delta_cdomain;
1148 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1149 "Receiving HTTP response header from CURL\n");
1150 /* first, check TLS certificate */
1151 if ((GNUNET_YES != s5r->ssl_checked) &&
1152 (GNUNET_YES == s5r->is_tls))
1153 // (HTTPS_PORT == s5r->port))
1155 if (GNUNET_OK != check_ssl_certificate (s5r))
1158 ndup = GNUNET_strndup (buffer,
1160 hdr_type = strtok (ndup,
1162 if (NULL == hdr_type)
1167 hdr_val = strtok (NULL,
1169 if (NULL == hdr_val)
1174 if (' ' == *hdr_val)
1177 /* custom logic for certain header types */
1178 new_cookie_hdr = NULL;
1179 if ((NULL != s5r->leho) &&
1180 (0 == strcasecmp (hdr_type,
1181 MHD_HTTP_HEADER_SET_COOKIE)))
1184 new_cookie_hdr = GNUNET_malloc (strlen (hdr_val)
1185 + strlen (s5r->domain) + 1);
1187 domain_matched = GNUNET_NO; /* make sure we match domain at most once */
1188 for (tok = strtok (hdr_val, ";"); NULL != tok; tok = strtok (NULL, ";"))
1190 if ((0 == strncasecmp (tok,
1192 strlen (" domain"))) &&
1193 (GNUNET_NO == domain_matched))
1195 domain_matched = GNUNET_YES;
1196 cookie_domain = tok + strlen (" domain") + 1;
1197 if (strlen (cookie_domain) < strlen (s5r->leho))
1199 delta_cdomain = strlen (s5r->leho) - strlen (cookie_domain);
1200 if (0 == strcasecmp (cookie_domain,
1201 s5r->leho + delta_cdomain))
1203 offset += sprintf (new_cookie_hdr + offset,
1209 else if (0 == strcmp (cookie_domain,
1212 offset += sprintf (new_cookie_hdr + offset,
1217 else if (('.' == cookie_domain[0]) &&
1218 (0 == strcmp (&cookie_domain[1],
1221 offset += sprintf (new_cookie_hdr + offset,
1226 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1227 _ ("Cookie domain `%s' supplied by server is invalid\n"),
1230 GNUNET_memcpy (new_cookie_hdr + offset,
1233 offset += strlen (tok);
1234 new_cookie_hdr[offset++] = ';';
1236 hdr_val = new_cookie_hdr;
1239 new_location = NULL;
1240 if (0 == strcasecmp (MHD_HTTP_HEADER_TRANSFER_ENCODING,
1243 /* Ignore transfer encoding, set automatically by MHD if required */
1246 if ((0 == strcasecmp (MHD_HTTP_HEADER_LOCATION,
1251 GNUNET_asprintf (&leho_host,
1252 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1256 if (0 == strncmp (leho_host,
1258 strlen (leho_host)))
1260 GNUNET_asprintf (&new_location,
1262 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1266 hdr_val + strlen (leho_host));
1267 hdr_val = new_location;
1269 GNUNET_free (leho_host);
1271 if (0 == strcasecmp (MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN,
1276 GNUNET_asprintf (&leho_host,
1277 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1281 if (0 == strncmp (leho_host,
1283 strlen (leho_host)))
1285 GNUNET_asprintf (&new_location,
1287 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1291 hdr_val = new_location;
1293 GNUNET_free (leho_host);
1296 /* MHD does not allow certain characters in values, remove those */
1297 if (NULL != (tok = strchr (hdr_val, '\n')))
1299 if (NULL != (tok = strchr (hdr_val, '\r')))
1301 if (NULL != (tok = strchr (hdr_val, '\t')))
1303 if (0 != strlen (hdr_val)) /* Rely in MHD to set those */
1305 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1306 "Adding header %s: %s to MHD response\n",
1309 header = GNUNET_new (struct HttpResponseHeader);
1310 header->type = GNUNET_strdup (hdr_type);
1311 header->value = GNUNET_strdup (hdr_val);
1312 GNUNET_CONTAINER_DLL_insert (s5r->header_head,
1318 GNUNET_free_non_null (new_cookie_hdr);
1319 GNUNET_free_non_null (new_location);
1325 * Create an MHD response object in @a s5r matching the
1326 * information we got from curl.
1328 * @param s5r the request for which we convert the response
1329 * @return #GNUNET_OK on success, #GNUNET_SYSERR if response was
1330 * already initialized before
1333 create_mhd_response_from_s5r (struct Socks5Request *s5r)
1336 double content_length;
1338 if (NULL != s5r->response)
1340 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1341 "Response already set!\n");
1342 return GNUNET_SYSERR;
1345 GNUNET_break (CURLE_OK ==
1346 curl_easy_getinfo (s5r->curl,
1347 CURLINFO_RESPONSE_CODE,
1349 GNUNET_break (CURLE_OK ==
1350 curl_easy_getinfo (s5r->curl,
1351 CURLINFO_CONTENT_LENGTH_DOWNLOAD,
1353 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1354 "Creating MHD response with code %d and size %d for %s%s\n",
1356 (int) content_length,
1359 s5r->response_code = resp_code;
1360 s5r->response = MHD_create_response_from_callback ((-1 == content_length)
1367 for (struct HttpResponseHeader *header = s5r->header_head;
1369 header = header->next)
1371 if (0 == strcasecmp (header->type,
1372 MHD_HTTP_HEADER_CONTENT_LENGTH))
1373 continue; /* MHD won't let us mess with those, for good reason */
1374 if ((0 == strcasecmp (header->type,
1375 MHD_HTTP_HEADER_TRANSFER_ENCODING)) &&
1376 ((0 == strcasecmp (header->value,
1378 (0 == strcasecmp (header->value,
1380 continue; /* MHD won't let us mess with those, for good reason */
1382 MHD_add_response_header (s5r->response,
1387 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1388 "Failed to add header `%s:%s'\n",
1393 /* force connection to be closed after each request, as we
1394 do not support HTTP pipelining (yet, FIXME!) */
1395 /*GNUNET_break (MHD_YES ==
1396 MHD_add_response_header (s5r->response,
1397 MHD_HTTP_HEADER_CONNECTION,
1399 MHD_resume_connection (s5r->con);
1400 s5r->suspended = GNUNET_NO;
1406 * Handle response payload data from cURL. Copies it into our `io_buf` to make
1407 * it available to MHD.
1409 * @param ptr pointer to the data
1410 * @param size number of blocks of data
1411 * @param nmemb blocksize
1412 * @param ctx our `struct Socks5Request *`
1413 * @return number of bytes handled
1416 curl_download_cb (void *ptr,
1421 struct Socks5Request *s5r = ctx;
1422 size_t total = size * nmemb;
1424 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1425 "Receiving %ux%u bytes for `%s%s' from cURL to download\n",
1426 (unsigned int) size,
1427 (unsigned int) nmemb,
1430 if (NULL == s5r->response)
1431 GNUNET_assert (GNUNET_OK ==
1432 create_mhd_response_from_s5r (s5r));
1433 if ((SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) &&
1436 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1437 "Previous upload finished... starting DOWNLOAD.\n");
1438 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1440 if ((SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
1441 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state))
1443 /* we're still not done with the upload, do not yet
1444 start the download, the IO buffer is still full
1445 with upload data. */
1446 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1447 "Pausing CURL download `%s%s', waiting for UPLOAD to finish\n",
1450 s5r->curl_paused = GNUNET_YES;
1451 return CURL_WRITEFUNC_PAUSE; /* not yet ready for data download */
1453 if (sizeof(s5r->io_buf) - s5r->io_len < total)
1455 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1456 "Pausing CURL `%s%s' download, not enough space %llu %llu %llu\n",
1459 (unsigned long long) sizeof(s5r->io_buf),
1460 (unsigned long long) s5r->io_len,
1461 (unsigned long long) total);
1462 s5r->curl_paused = GNUNET_YES;
1463 return CURL_WRITEFUNC_PAUSE; /* not enough space */
1465 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
1468 s5r->io_len += total;
1469 if (GNUNET_YES == s5r->suspended)
1471 MHD_resume_connection (s5r->con);
1472 s5r->suspended = GNUNET_NO;
1474 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1475 "Received %llu bytes of payload via cURL from %s\n",
1476 (unsigned long long) total,
1478 if (s5r->io_len == total)
1479 run_mhd_now (s5r->hd);
1485 * cURL callback for uploaded (PUT/POST) data. Copies it into our `io_buf`
1486 * to make it available to MHD.
1488 * @param buf where to write the data
1489 * @param size number of bytes per member
1490 * @param nmemb number of members available in @a buf
1491 * @param cls our `struct Socks5Request` that generated the data
1492 * @return number of bytes copied to @a buf
1495 curl_upload_cb (void *buf,
1500 struct Socks5Request *s5r = cls;
1501 size_t len = size * nmemb;
1504 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1505 "Receiving %ux%u bytes for `%s%s' from cURL to upload\n",
1506 (unsigned int) size,
1507 (unsigned int) nmemb,
1511 if ((0 == s5r->io_len) &&
1512 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state))
1514 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1515 "Pausing CURL UPLOAD %s%s, need more data\n",
1518 return CURL_READFUNC_PAUSE;
1520 if ((0 == s5r->io_len) &&
1521 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state))
1523 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1524 if (GNUNET_YES == s5r->curl_paused)
1526 s5r->curl_paused = GNUNET_NO;
1527 curl_easy_pause (s5r->curl,
1530 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1531 "Completed CURL UPLOAD %s%s\n",
1534 return 0; /* upload finished, can now download */
1536 if ((SOCKS5_SOCKET_UPLOAD_STARTED != s5r->state) &&
1537 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state))
1540 return CURL_READFUNC_ABORT;
1542 to_copy = GNUNET_MIN (s5r->io_len,
1547 memmove (s5r->io_buf,
1548 &s5r->io_buf[to_copy],
1549 s5r->io_len - to_copy);
1550 s5r->io_len -= to_copy;
1551 if (s5r->io_len + to_copy == sizeof(s5r->io_buf))
1552 run_mhd_now (s5r->hd); /* got more space for upload now */
1557 /* ************************** main loop of cURL interaction ****************** */
1561 * Task that is run when we are ready to receive more data
1564 * @param cls closure
1567 curl_task_download (void *cls);
1571 * Ask cURL for the select() sets and schedule cURL operations.
1574 curl_download_prepare ()
1581 struct GNUNET_NETWORK_FDSet *grs;
1582 struct GNUNET_NETWORK_FDSet *gws;
1584 struct GNUNET_TIME_Relative rtime;
1586 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1587 "Scheduling CURL interaction\n");
1588 if (NULL != curl_download_task)
1590 GNUNET_SCHEDULER_cancel (curl_download_task);
1591 curl_download_task = NULL;
1597 if (CURLM_OK != (mret = curl_multi_fdset (curl_multi,
1603 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1604 "%s failed at %s:%d: `%s'\n",
1605 "curl_multi_fdset", __FILE__, __LINE__,
1606 curl_multi_strerror (mret));
1610 GNUNET_break (CURLM_OK ==
1611 curl_multi_timeout (curl_multi,
1614 rtime = GNUNET_TIME_UNIT_FOREVER_REL;
1616 rtime = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
1620 grs = GNUNET_NETWORK_fdset_create ();
1621 gws = GNUNET_NETWORK_fdset_create ();
1622 GNUNET_NETWORK_fdset_copy_native (grs,
1625 GNUNET_NETWORK_fdset_copy_native (gws,
1628 curl_download_task = GNUNET_SCHEDULER_add_select (
1629 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1633 &curl_task_download,
1635 GNUNET_NETWORK_fdset_destroy (gws);
1636 GNUNET_NETWORK_fdset_destroy (grs);
1640 curl_download_task = GNUNET_SCHEDULER_add_delayed (rtime,
1641 &curl_task_download,
1648 * Task that is run when we are ready to receive more data from curl.
1650 * @param cls closure, NULL
1653 curl_task_download (void *cls)
1657 struct CURLMsg *msg;
1659 struct Socks5Request *s5r;
1661 curl_download_task = NULL;
1662 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1663 "Running CURL interaction\n");
1667 mret = curl_multi_perform (curl_multi,
1669 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1670 "Checking CURL multi status: %d\n",
1672 while (NULL != (msg = curl_multi_info_read (curl_multi,
1675 GNUNET_break (CURLE_OK ==
1676 curl_easy_getinfo (msg->easy_handle,
1687 /* documentation says this is not used */
1692 switch (msg->data.result)
1695 case CURLE_GOT_NOTHING:
1696 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1697 "CURL download %s%s completed.\n",
1700 if (NULL == s5r->response)
1702 GNUNET_assert (GNUNET_OK ==
1703 create_mhd_response_from_s5r (s5r));
1705 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1706 if (GNUNET_YES == s5r->suspended)
1708 MHD_resume_connection (s5r->con);
1709 s5r->suspended = GNUNET_NO;
1711 run_mhd_now (s5r->hd);
1715 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1716 "Download curl %s%s failed: %s\n",
1719 curl_easy_strerror (msg->data.result));
1720 /* FIXME: indicate error somehow? close MHD connection badly as well? */
1721 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1722 if (GNUNET_YES == s5r->suspended)
1724 MHD_resume_connection (s5r->con);
1725 s5r->suspended = GNUNET_NO;
1727 run_mhd_now (s5r->hd);
1730 if (NULL == s5r->response)
1731 s5r->response = curl_failure_response;
1735 /* documentation says this is not used */
1740 /* unexpected status code */
1747 while (mret == CURLM_CALL_MULTI_PERFORM);
1748 if (CURLM_OK != mret)
1749 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1750 "%s failed at %s:%d: `%s'\n",
1751 "curl_multi_perform", __FILE__, __LINE__,
1752 curl_multi_strerror (mret));
1755 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1756 "Suspending cURL multi loop, no more events pending\n");
1757 if (NULL != curl_download_task)
1759 GNUNET_SCHEDULER_cancel (curl_download_task);
1760 curl_download_task = NULL;
1762 return; /* nothing more in progress */
1764 curl_download_prepare ();
1768 /* ********************************* MHD response generation ******************* */
1772 * Read HTTP request header field from the request. Copies the fields
1773 * over to the 'headers' that will be given to curl. However, 'Host'
1774 * is substituted with the LEHO if present. We also change the
1775 * 'Connection' header value to "close" as the proxy does not support
1778 * @param cls our `struct Socks5Request`
1779 * @param kind value kind
1780 * @param key field key
1781 * @param value field value
1782 * @return #MHD_YES to continue to iterate
1785 con_val_iter (void *cls,
1786 enum MHD_ValueKind kind,
1790 struct Socks5Request *s5r = cls;
1793 if ((0 == strcasecmp (MHD_HTTP_HEADER_HOST,
1795 (NULL != s5r->leho))
1797 GNUNET_asprintf (&hdr,
1801 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1802 "Adding HEADER `%s' to HTTP request\n",
1804 s5r->headers = curl_slist_append (s5r->headers,
1812 * Main MHD callback for handling requests.
1815 * @param con MHD connection handle
1816 * @param url the url in the request
1817 * @param meth the HTTP method used ("GET", "PUT", etc.)
1818 * @param ver the HTTP version string (i.e. "HTTP/1.1")
1819 * @param upload_data the data being uploaded (excluding HEADERS,
1820 * for a POST that fits into memory and that is encoded
1821 * with a supported encoding, the POST data will NOT be
1822 * given in upload_data and is instead available as
1823 * part of MHD_get_connection_values; very large POST
1824 * data *will* be made available incrementally in
1826 * @param upload_data_size set initially to the size of the
1827 * @a upload_data provided; the method must update this
1828 * value to the number of bytes NOT processed;
1829 * @param con_cls pointer to location where we store the `struct Request`
1830 * @return #MHD_YES if the connection was handled successfully,
1831 * #MHD_NO if the socket must be closed due to a serious
1832 * error while handling the request
1835 create_response (void *cls,
1836 struct MHD_Connection *con,
1840 const char *upload_data,
1841 size_t *upload_data_size,
1844 struct Socks5Request *s5r = *con_cls;
1846 char ipstring[INET6_ADDRSTRLEN];
1847 char ipaddr[INET6_ADDRSTRLEN + 2];
1848 const struct sockaddr *sa;
1849 const struct sockaddr_in *s4;
1850 const struct sockaddr_in6 *s6;
1860 /* Fresh connection. */
1861 if (SOCKS5_SOCKET_WITH_MHD == s5r->state)
1863 /* first time here, initialize curl handle */
1866 sa = (const struct sockaddr *) &s5r->destination_address;
1867 switch (sa->sa_family)
1870 s4 = (const struct sockaddr_in *) &s5r->destination_address;
1871 if (NULL == inet_ntop (AF_INET,
1879 GNUNET_snprintf (ipaddr,
1883 port = ntohs (s4->sin_port);
1887 s6 = (const struct sockaddr_in6 *) &s5r->destination_address;
1888 if (NULL == inet_ntop (AF_INET6,
1896 GNUNET_snprintf (ipaddr,
1900 port = ntohs (s6->sin6_port);
1912 if (NULL == s5r->curl)
1913 s5r->curl = curl_easy_init ();
1914 if (NULL == s5r->curl)
1915 return MHD_queue_response (con,
1916 MHD_HTTP_INTERNAL_SERVER_ERROR,
1917 curl_failure_response);
1918 curl_easy_setopt (s5r->curl,
1919 CURLOPT_HEADERFUNCTION,
1921 curl_easy_setopt (s5r->curl,
1924 curl_easy_setopt (s5r->curl,
1925 CURLOPT_FOLLOWLOCATION,
1928 curl_easy_setopt (s5r->curl,
1931 curl_easy_setopt (s5r->curl,
1932 CURLOPT_CONNECTTIMEOUT,
1934 curl_easy_setopt (s5r->curl,
1937 curl_easy_setopt (s5r->curl,
1940 curl_easy_setopt (s5r->curl,
1941 CURLOPT_HTTP_CONTENT_DECODING,
1943 curl_easy_setopt (s5r->curl,
1946 curl_easy_setopt (s5r->curl,
1949 curl_easy_setopt (s5r->curl,
1953 * Pre-populate cache to resolve Hostname.
1954 * This is necessary as the DNS name in the CURLOPT_URL is used
1955 * for SNI http://de.wikipedia.org/wiki/Server_Name_Indication
1957 if (NULL != s5r->leho)
1961 GNUNET_asprintf (&curl_hosts,
1966 s5r->hosts = curl_slist_append (NULL,
1968 curl_easy_setopt (s5r->curl,
1971 GNUNET_free (curl_hosts);
1975 GNUNET_asprintf (&curlurl,
1976 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1978 : "https://%s:%d%s",
1987 GNUNET_asprintf (&curlurl,
1988 (GNUNET_YES != s5r->is_tls) // (HTTPS_PORT != s5r->port)
1990 : "https://%s:%d%s",
1995 curl_easy_setopt (s5r->curl,
1998 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1999 "Launching %s CURL interaction, fetching `%s'\n",
2000 (s5r->is_gns) ? "GNS" : "DNS",
2002 GNUNET_free (curlurl);
2003 if (0 == strcasecmp (meth,
2004 MHD_HTTP_METHOD_PUT))
2006 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
2007 curl_easy_setopt (s5r->curl,
2010 curl_easy_setopt (s5r->curl,
2011 CURLOPT_WRITEFUNCTION,
2013 curl_easy_setopt (s5r->curl,
2016 GNUNET_assert (CURLE_OK ==
2017 curl_easy_setopt (s5r->curl,
2018 CURLOPT_READFUNCTION,
2020 curl_easy_setopt (s5r->curl,
2025 long upload_size = 0;
2027 us = MHD_lookup_connection_value (con,
2029 MHD_HTTP_HEADER_CONTENT_LENGTH);
2030 if ((1 == sscanf (us,
2035 curl_easy_setopt (s5r->curl,
2041 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_POST))
2043 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
2044 curl_easy_setopt (s5r->curl,
2047 curl_easy_setopt (s5r->curl,
2048 CURLOPT_WRITEFUNCTION,
2050 curl_easy_setopt (s5r->curl,
2053 curl_easy_setopt (s5r->curl,
2054 CURLOPT_READFUNCTION,
2056 curl_easy_setopt (s5r->curl,
2064 us = MHD_lookup_connection_value (con,
2066 MHD_HTTP_HEADER_CONTENT_LENGTH);
2073 curl_easy_setopt (s5r->curl,
2079 curl_easy_setopt (s5r->curl,
2085 else if (0 == strcasecmp (meth,
2086 MHD_HTTP_METHOD_HEAD))
2088 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2089 curl_easy_setopt (s5r->curl,
2093 else if (0 == strcasecmp (meth,
2094 MHD_HTTP_METHOD_OPTIONS))
2096 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2097 curl_easy_setopt (s5r->curl,
2098 CURLOPT_CUSTOMREQUEST,
2100 curl_easy_setopt (s5r->curl,
2101 CURLOPT_WRITEFUNCTION,
2103 curl_easy_setopt (s5r->curl,
2107 else if (0 == strcasecmp (meth,
2108 MHD_HTTP_METHOD_GET))
2110 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2111 curl_easy_setopt (s5r->curl,
2114 curl_easy_setopt (s5r->curl,
2115 CURLOPT_WRITEFUNCTION,
2117 curl_easy_setopt (s5r->curl,
2121 else if (0 == strcasecmp (meth,
2122 MHD_HTTP_METHOD_DELETE))
2124 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2125 curl_easy_setopt (s5r->curl,
2126 CURLOPT_CUSTOMREQUEST,
2128 curl_easy_setopt (s5r->curl,
2129 CURLOPT_WRITEFUNCTION,
2131 curl_easy_setopt (s5r->curl,
2137 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2138 _ ("Unsupported HTTP method `%s'\n"),
2140 curl_easy_cleanup (s5r->curl);
2145 if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_0))
2147 curl_easy_setopt (s5r->curl,
2148 CURLOPT_HTTP_VERSION,
2149 CURL_HTTP_VERSION_1_0);
2151 else if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_1))
2153 curl_easy_setopt (s5r->curl,
2154 CURLOPT_HTTP_VERSION,
2155 CURL_HTTP_VERSION_1_1);
2159 curl_easy_setopt (s5r->curl,
2160 CURLOPT_HTTP_VERSION,
2161 CURL_HTTP_VERSION_NONE);
2164 if (GNUNET_YES == s5r->is_tls) // (HTTPS_PORT == s5r->port)
2166 curl_easy_setopt (s5r->curl,
2169 if (0 < s5r->num_danes)
2170 curl_easy_setopt (s5r->curl,
2171 CURLOPT_SSL_VERIFYPEER,
2174 curl_easy_setopt (s5r->curl,
2175 CURLOPT_SSL_VERIFYPEER,
2177 /* Disable cURL checking the hostname, as we will check ourselves
2178 as only we have the domain name or the LEHO or the DANE record */
2179 curl_easy_setopt (s5r->curl,
2180 CURLOPT_SSL_VERIFYHOST,
2185 curl_easy_setopt (s5r->curl,
2191 curl_multi_add_handle (curl_multi,
2195 curl_easy_cleanup (s5r->curl);
2199 MHD_get_connection_values (con,
2201 (MHD_KeyValueIterator) & con_val_iter,
2203 curl_easy_setopt (s5r->curl,
2206 curl_download_prepare ();
2210 /* continuing to process request */
2211 if (0 != *upload_data_size)
2213 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2214 "Processing %u bytes UPLOAD\n",
2215 (unsigned int) *upload_data_size);
2217 /* FIXME: This must be set or a header with Transfer-Encoding: chunked. Else
2218 * upload callback is not called!
2220 curl_easy_setopt (s5r->curl,
2221 CURLOPT_POSTFIELDSIZE,
2224 left = GNUNET_MIN (*upload_data_size,
2225 sizeof(s5r->io_buf) - s5r->io_len);
2226 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
2229 s5r->io_len += left;
2230 *upload_data_size -= left;
2231 GNUNET_assert (NULL != s5r->curl);
2232 if (GNUNET_YES == s5r->curl_paused)
2234 s5r->curl_paused = GNUNET_NO;
2235 curl_easy_pause (s5r->curl,
2240 if (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state)
2242 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2243 "Finished processing UPLOAD\n");
2244 s5r->state = SOCKS5_SOCKET_UPLOAD_DONE;
2246 if (NULL == s5r->response)
2248 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2249 "Waiting for HTTP response for %s%s...\n",
2252 MHD_suspend_connection (con);
2253 s5r->suspended = GNUNET_YES;
2256 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2257 "Queueing response for %s%s with MHD\n",
2260 run_mhd_now (s5r->hd);
2261 return MHD_queue_response (con,
2267 /* ******************** MHD HTTP setup and event loop ******************** */
2271 * Function called when MHD decides that we are done with a request.
2274 * @param connection connection handle
2275 * @param con_cls value as set by the last call to
2276 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
2277 * @param toe reason for request termination (ignored)
2280 mhd_completed_cb (void *cls,
2281 struct MHD_Connection *connection,
2283 enum MHD_RequestTerminationCode toe)
2285 struct Socks5Request *s5r = *con_cls;
2289 if (MHD_REQUEST_TERMINATED_COMPLETED_OK != toe)
2290 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2291 "MHD encountered error handling request: %d\n",
2293 if (NULL != s5r->curl)
2295 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2296 "Removing cURL handle (MHD interaction complete)\n");
2297 curl_multi_remove_handle (curl_multi,
2299 curl_slist_free_all (s5r->headers);
2300 s5r->headers = NULL;
2301 curl_easy_reset (s5r->curl);
2305 curl_download_prepare ();
2307 if ((NULL != s5r->response) &&
2308 (curl_failure_response != s5r->response))
2309 MHD_destroy_response (s5r->response);
2310 for (struct HttpResponseHeader *header = s5r->header_head;
2312 header = s5r->header_head)
2314 GNUNET_CONTAINER_DLL_remove (s5r->header_head,
2317 GNUNET_free (header->type);
2318 GNUNET_free (header->value);
2319 GNUNET_free (header);
2321 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2322 "Finished request for %s\n",
2324 GNUNET_free (s5r->url);
2325 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2327 s5r->response = NULL;
2333 * Function called when MHD connection is opened or closed.
2336 * @param connection connection handle
2337 * @param con_cls value as set by the last call to
2338 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
2339 * @param toe connection notification type
2342 mhd_connection_cb (void *cls,
2343 struct MHD_Connection *connection,
2345 enum MHD_ConnectionNotificationCode cnc)
2347 struct Socks5Request *s5r;
2348 const union MHD_ConnectionInfo *ci;
2353 case MHD_CONNECTION_NOTIFY_STARTED:
2354 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection started...\n");
2355 ci = MHD_get_connection_info (connection,
2356 MHD_CONNECTION_INFO_CONNECTION_FD);
2362 sock = ci->connect_fd;
2363 for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
2365 if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
2367 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2368 "Context set...\n");
2369 s5r->ssl_checked = GNUNET_NO;
2376 case MHD_CONNECTION_NOTIFY_CLOSED:
2377 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2378 "Connection closed... cleaning up\n");
2382 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2383 "Connection stale!\n");
2387 curl_download_prepare ();
2397 * Function called when MHD first processes an incoming connection.
2398 * Gives us the respective URI information.
2400 * We use this to associate the `struct MHD_Connection` with our
2401 * internal `struct Socks5Request` data structure (by checking
2402 * for matching sockets).
2404 * @param cls the HTTP server handle (a `struct MhdHttpList`)
2405 * @param url the URL that is being requested
2406 * @param connection MHD connection object for the request
2407 * @return the `struct Socks5Request` that this @a connection is for
2410 mhd_log_callback (void *cls,
2412 struct MHD_Connection *connection)
2414 struct Socks5Request *s5r;
2415 const union MHD_ConnectionInfo *ci;
2417 ci = MHD_get_connection_info (connection,
2418 MHD_CONNECTION_INFO_SOCKET_CONTEXT);
2419 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Processing %s\n", url);
2425 s5r = ci->socket_context;
2426 if (NULL != s5r->url)
2431 s5r->url = GNUNET_strdup (url);
2432 if (NULL != s5r->timeout_task)
2434 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
2435 s5r->timeout_task = NULL;
2437 GNUNET_assert (s5r->state == SOCKS5_SOCKET_WITH_MHD);
2443 * Kill the given MHD daemon.
2445 * @param hd daemon to stop
2448 kill_httpd (struct MhdHttpList *hd)
2450 GNUNET_CONTAINER_DLL_remove (mhd_httpd_head,
2453 GNUNET_free_non_null (hd->domain);
2454 MHD_stop_daemon (hd->daemon);
2455 if (NULL != hd->httpd_task)
2457 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2458 hd->httpd_task = NULL;
2460 GNUNET_free_non_null (hd->proxy_cert);
2468 * Task run whenever HTTP server is idle for too long. Kill it.
2470 * @param cls the `struct MhdHttpList *`
2473 kill_httpd_task (void *cls)
2475 struct MhdHttpList *hd = cls;
2477 hd->httpd_task = NULL;
2483 * Task run whenever HTTP server operations are pending.
2485 * @param cls the `struct MhdHttpList *` of the daemon that is being run
2488 do_httpd (void *cls);
2492 * Schedule MHD. This function should be called initially when an
2493 * MHD is first getting its client socket, and will then automatically
2494 * always be called later whenever there is work to be done.
2496 * @param hd the daemon to schedule
2499 schedule_httpd (struct MhdHttpList *hd)
2504 struct GNUNET_NETWORK_FDSet *wrs;
2505 struct GNUNET_NETWORK_FDSet *wws;
2508 MHD_UNSIGNED_LONG_LONG timeout;
2509 struct GNUNET_TIME_Relative tv;
2516 MHD_get_fdset (hd->daemon,
2525 haveto = MHD_get_timeout (hd->daemon,
2527 if (MHD_YES == haveto)
2528 tv.rel_value_us = (uint64_t) timeout * 1000LL;
2530 tv = GNUNET_TIME_UNIT_FOREVER_REL;
2533 wrs = GNUNET_NETWORK_fdset_create ();
2534 wws = GNUNET_NETWORK_fdset_create ();
2535 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
2536 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
2543 if (NULL != hd->httpd_task)
2545 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2546 hd->httpd_task = NULL;
2548 if ((MHD_YES != haveto) &&
2552 /* daemon is idle, kill after timeout */
2553 hd->httpd_task = GNUNET_SCHEDULER_add_delayed (MHD_CACHE_TIMEOUT,
2560 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2565 GNUNET_NETWORK_fdset_destroy (wrs);
2567 GNUNET_NETWORK_fdset_destroy (wws);
2572 * Task run whenever HTTP server operations are pending.
2574 * @param cls the `struct MhdHttpList` of the daemon that is being run
2577 do_httpd (void *cls)
2579 struct MhdHttpList *hd = cls;
2581 hd->httpd_task = NULL;
2582 MHD_run (hd->daemon);
2583 schedule_httpd (hd);
2588 * Run MHD now, we have extra data ready for the callback.
2590 * @param hd the daemon to run now.
2593 run_mhd_now (struct MhdHttpList *hd)
2595 if (NULL != hd->httpd_task)
2596 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2597 hd->httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd,
2603 * Read file in filename
2605 * @param filename file to read
2606 * @param size pointer where filesize is stored
2607 * @return NULL on error
2610 load_file (const char*filename,
2617 GNUNET_DISK_file_size (filename,
2622 if (fsize > MAX_PEM_SIZE)
2624 *size = (unsigned int) fsize;
2625 buffer = GNUNET_malloc (*size);
2627 GNUNET_DISK_fn_read (filename,
2631 GNUNET_free (buffer);
2639 * Load PEM key from file
2641 * @param key where to store the data
2642 * @param keyfile path to the PEM file
2643 * @return #GNUNET_OK on success
2646 load_key_from_file (gnutls_x509_privkey_t key,
2649 gnutls_datum_t key_data;
2652 key_data.data = load_file (keyfile,
2654 if (NULL == key_data.data)
2655 return GNUNET_SYSERR;
2656 ret = gnutls_x509_privkey_import (key, &key_data,
2657 GNUTLS_X509_FMT_PEM);
2658 if (GNUTLS_E_SUCCESS != ret)
2660 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2661 _ ("Unable to import private key from file `%s'\n"),
2664 GNUNET_free_non_null (key_data.data);
2665 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2670 * Load cert from file
2672 * @param crt struct to store data in
2673 * @param certfile path to pem file
2674 * @return #GNUNET_OK on success
2677 load_cert_from_file (gnutls_x509_crt_t crt,
2678 const char*certfile)
2680 gnutls_datum_t cert_data;
2683 cert_data.data = load_file (certfile,
2685 if (NULL == cert_data.data)
2686 return GNUNET_SYSERR;
2687 ret = gnutls_x509_crt_import (crt,
2689 GNUTLS_X509_FMT_PEM);
2690 if (GNUTLS_E_SUCCESS != ret)
2692 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2693 _ ("Unable to import certificate from `%s'\n"),
2696 GNUNET_free_non_null (cert_data.data);
2697 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2702 * Generate new certificate for specific name
2704 * @param name the subject name to generate a cert for
2705 * @return a struct holding the PEM data, NULL on error
2707 static struct ProxyGNSCertificate *
2708 generate_gns_certificate (const char *name)
2710 unsigned int serial;
2711 size_t key_buf_size;
2712 size_t cert_buf_size;
2713 gnutls_x509_crt_t request;
2716 struct ProxyGNSCertificate *pgc;
2718 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2719 "Generating x.509 certificate for `%s'\n",
2721 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_init (&request));
2722 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_key (request,
2724 pgc = GNUNET_new (struct ProxyGNSCertificate);
2725 gnutls_x509_crt_set_dn_by_oid (request,
2726 GNUTLS_OID_X520_COUNTRY_NAME,
2730 gnutls_x509_crt_set_dn_by_oid (request,
2731 GNUTLS_OID_X520_ORGANIZATION_NAME,
2734 strlen ("GNU Name System"));
2735 gnutls_x509_crt_set_dn_by_oid (request,
2736 GNUTLS_OID_X520_COMMON_NAME,
2740 gnutls_x509_crt_set_subject_alternative_name (request,
2743 GNUNET_break (GNUTLS_E_SUCCESS ==
2744 gnutls_x509_crt_set_version (request,
2746 gnutls_rnd (GNUTLS_RND_NONCE,
2749 gnutls_x509_crt_set_serial (request,
2752 etime = time (NULL);
2753 tm_data = localtime (&etime);
2755 etime = mktime (tm_data);
2756 gnutls_x509_crt_set_activation_time (request,
2759 etime = mktime (tm_data);
2760 gnutls_x509_crt_set_expiration_time (request,
2762 gnutls_x509_crt_sign2 (request,
2767 key_buf_size = sizeof(pgc->key);
2768 cert_buf_size = sizeof(pgc->cert);
2769 gnutls_x509_crt_export (request,
2770 GNUTLS_X509_FMT_PEM,
2773 gnutls_x509_privkey_export (proxy_ca.key,
2774 GNUTLS_X509_FMT_PEM,
2777 gnutls_x509_crt_deinit (request);
2783 * Function called by MHD with errors, suppresses them all.
2785 * @param cls closure
2786 * @param fm format string (`printf()`-style)
2787 * @param ap arguments to @a fm
2790 mhd_error_log_callback (void *cls,
2799 * Lookup (or create) an TLS MHD instance for a particular domain.
2801 * @param domain the domain the TLS daemon has to serve
2802 * @return NULL on error
2804 static struct MhdHttpList *
2805 lookup_ssl_httpd (const char*domain)
2807 struct MhdHttpList *hd;
2808 struct ProxyGNSCertificate *pgc;
2815 for (hd = mhd_httpd_head; NULL != hd; hd = hd->next)
2816 if ((NULL != hd->domain) &&
2817 (0 == strcmp (hd->domain, domain)))
2819 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2820 "Starting fresh MHD HTTPS instance for domain `%s'\n",
2822 pgc = generate_gns_certificate (domain);
2823 hd = GNUNET_new (struct MhdHttpList);
2824 hd->is_ssl = GNUNET_YES;
2825 hd->domain = GNUNET_strdup (domain);
2826 hd->proxy_cert = pgc;
2827 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_SSL
2828 | MHD_USE_NO_LISTEN_SOCKET
2829 | MHD_ALLOW_SUSPEND_RESUME,
2832 &create_response, hd,
2833 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned
2835 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb,
2837 MHD_OPTION_NOTIFY_CONNECTION,
2838 &mhd_connection_cb, NULL,
2839 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback,
2841 MHD_OPTION_EXTERNAL_LOGGER,
2842 &mhd_error_log_callback, NULL,
2843 MHD_OPTION_HTTPS_MEM_KEY, pgc->key,
2844 MHD_OPTION_HTTPS_MEM_CERT, pgc->cert,
2846 if (NULL == hd->daemon)
2852 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
2860 * Task run when a Socks5Request somehow fails to be associated with
2861 * an MHD connection (i.e. because the client never speaks HTTP after
2862 * the SOCKS5 handshake). Clean up.
2864 * @param cls the `struct Socks5Request *`
2867 timeout_s5r_handshake (void *cls)
2869 struct Socks5Request *s5r = cls;
2871 s5r->timeout_task = NULL;
2877 * We're done with the Socks5 protocol, now we need to pass the
2878 * connection data through to the final destination, either
2879 * direct (if the protocol might not be HTTP), or via MHD
2880 * (if the port looks like it should be HTTP).
2882 * @param s5r socks request that has reached the final stage
2885 setup_data_transfer (struct Socks5Request *s5r)
2887 struct MhdHttpList *hd;
2889 const struct sockaddr *addr;
2893 if (GNUNET_YES == s5r->is_tls)
2895 GNUNET_asprintf (&domain,
2898 hd = lookup_ssl_httpd (domain);
2901 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2902 _ ("Failed to start HTTPS server for `%s'\n"),
2905 GNUNET_free (domain);
2912 GNUNET_assert (NULL != httpd);
2915 fd = GNUNET_NETWORK_get_fd (s5r->sock);
2916 addr = GNUNET_NETWORK_get_addr (s5r->sock);
2917 len = GNUNET_NETWORK_get_addrlen (s5r->sock);
2918 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2920 MHD_add_connection (hd->daemon,
2925 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2926 _ ("Failed to pass client to MHD\n"));
2928 GNUNET_free_non_null (domain);
2932 schedule_httpd (hd);
2933 s5r->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_HANDSHAKE_TIMEOUT,
2934 &timeout_s5r_handshake,
2936 GNUNET_free_non_null (domain);
2940 /* ********************* SOCKS handling ************************* */
2944 * Write data from buffer to socks5 client, then continue with state machine.
2946 * @param cls the closure with the `struct Socks5Request`
2949 do_write (void *cls)
2951 struct Socks5Request *s5r = cls;
2955 len = GNUNET_NETWORK_socket_send (s5r->sock,
2960 /* write error: connection closed, shutdown, etc.; just clean up */
2961 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2968 s5r->wbuf_len - len);
2969 s5r->wbuf_len -= len;
2970 if (s5r->wbuf_len > 0)
2972 /* not done writing */
2974 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2980 /* we're done writing, continue with state machine! */
2988 case SOCKS5_REQUEST:
2989 GNUNET_assert (NULL != s5r->rtask);
2992 case SOCKS5_DATA_TRANSFER:
2993 setup_data_transfer (s5r);
2996 case SOCKS5_WRITE_THEN_CLEANUP:
3008 * Return a server response message indicating a failure to the client.
3010 * @param s5r request to return failure code for
3011 * @param sc status code to return
3014 signal_socks_failure (struct Socks5Request *s5r,
3015 enum Socks5StatusCode sc)
3017 struct Socks5ServerResponseMessage *s_resp;
3019 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
3020 memset (s_resp, 0, sizeof(struct Socks5ServerResponseMessage));
3021 s_resp->version = SOCKS_VERSION_5;
3023 s5r->state = SOCKS5_WRITE_THEN_CLEANUP;
3024 if (NULL != s5r->wtask)
3026 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
3033 * Return a server response message indicating success.
3035 * @param s5r request to return success status message for
3038 signal_socks_success (struct Socks5Request *s5r)
3040 struct Socks5ServerResponseMessage *s_resp;
3042 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
3043 s_resp->version = SOCKS_VERSION_5;
3044 s_resp->reply = SOCKS5_STATUS_REQUEST_GRANTED;
3045 s_resp->reserved = 0;
3046 s_resp->addr_type = SOCKS5_AT_IPV4;
3047 /* zero out IPv4 address and port */
3050 sizeof(struct in_addr) + sizeof(uint16_t));
3051 s5r->wbuf_len += sizeof(struct Socks5ServerResponseMessage)
3052 + sizeof(struct in_addr) + sizeof(uint16_t);
3053 if (NULL == s5r->wtask)
3055 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
3062 * Process GNS results for target domain.
3064 * @param cls the `struct Socks5Request *`
3065 * @param tld #GNUNET_YES if this was a GNS TLD.
3066 * @param rd_count number of records returned
3067 * @param rd record data
3070 handle_gns_result (void *cls,
3073 const struct GNUNET_GNSRECORD_Data *rd)
3075 struct Socks5Request *s5r = cls;
3076 const struct GNUNET_GNSRECORD_Data *r;
3079 s5r->gns_lookup = NULL;
3082 for (uint32_t i = 0; i < rd_count; i++)
3085 switch (r->record_type)
3087 case GNUNET_DNSPARSER_TYPE_A:
3089 struct sockaddr_in *in;
3091 if (sizeof(struct in_addr) != r->data_size)
3093 GNUNET_break_op (0);
3096 if (GNUNET_YES == got_ip)
3099 GNUNET_NETWORK_test_pf (PF_INET))
3101 got_ip = GNUNET_YES;
3102 in = (struct sockaddr_in *) &s5r->destination_address;
3103 in->sin_family = AF_INET;
3104 GNUNET_memcpy (&in->sin_addr,
3107 in->sin_port = htons (s5r->port);
3108 #if HAVE_SOCKADDR_IN_SIN_LEN
3109 in->sin_len = sizeof(*in);
3114 case GNUNET_DNSPARSER_TYPE_AAAA:
3116 struct sockaddr_in6 *in;
3118 if (sizeof(struct in6_addr) != r->data_size)
3120 GNUNET_break_op (0);
3123 if (GNUNET_YES == got_ip)
3125 if (GNUNET_YES == disable_v6)
3128 GNUNET_NETWORK_test_pf (PF_INET6))
3130 /* FIXME: allow user to disable IPv6 per configuration option... */
3131 got_ip = GNUNET_YES;
3132 in = (struct sockaddr_in6 *) &s5r->destination_address;
3133 in->sin6_family = AF_INET6;
3134 GNUNET_memcpy (&in->sin6_addr,
3137 in->sin6_port = htons (s5r->port);
3138 #if HAVE_SOCKADDR_IN_SIN_LEN
3139 in->sin6_len = sizeof(*in);
3144 case GNUNET_GNSRECORD_TYPE_VPN:
3145 GNUNET_break (0); /* should have been translated within GNS */
3148 case GNUNET_GNSRECORD_TYPE_LEHO:
3149 GNUNET_free_non_null (s5r->leho);
3150 s5r->leho = GNUNET_strndup (r->data,
3154 case GNUNET_GNSRECORD_TYPE_BOX:
3156 const struct GNUNET_GNSRECORD_BoxRecord *box;
3158 if (r->data_size < sizeof(struct GNUNET_GNSRECORD_BoxRecord))
3160 GNUNET_break_op (0);
3164 if ((ntohl (box->record_type) != GNUNET_DNSPARSER_TYPE_TLSA) ||
3165 (ntohs (box->protocol) != IPPROTO_TCP) ||
3166 (ntohs (box->service) != s5r->port))
3167 break; /* BOX record does not apply */
3168 if (s5r->num_danes >= MAX_DANES)
3170 GNUNET_break (0); /* MAX_DANES too small */
3173 s5r->is_tls = GNUNET_YES; /* This should be TLS */
3174 s5r->dane_data_len[s5r->num_danes]
3175 = r->data_size - sizeof(struct GNUNET_GNSRECORD_BoxRecord);
3176 s5r->dane_data[s5r->num_danes]
3177 = GNUNET_memdup (&box[1],
3178 s5r->dane_data_len[s5r->num_danes]);
3188 if ((GNUNET_YES != got_ip) &&
3189 (GNUNET_YES == tld))
3191 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3192 "Name resolution failed to yield useful IP address.\n");
3193 signal_socks_failure (s5r,
3194 SOCKS5_STATUS_GENERAL_FAILURE);
3197 s5r->state = SOCKS5_DATA_TRANSFER;
3198 signal_socks_success (s5r);
3203 * Remove the first @a len bytes from the beginning of the read buffer.
3205 * @param s5r the handle clear the read buffer for
3206 * @param len number of bytes in read buffer to advance
3209 clear_from_s5r_rbuf (struct Socks5Request *s5r,
3212 GNUNET_assert (len <= s5r->rbuf_len);
3215 s5r->rbuf_len - len);
3216 s5r->rbuf_len -= len;
3221 * Read data from incoming Socks5 connection
3223 * @param cls the closure with the `struct Socks5Request`
3226 do_s5r_read (void *cls)
3228 struct Socks5Request *s5r = cls;
3229 const struct Socks5ClientHelloMessage *c_hello;
3230 struct Socks5ServerHelloMessage *s_hello;
3231 const struct Socks5ClientRequestMessage *c_req;
3234 const struct GNUNET_SCHEDULER_TaskContext *tc;
3237 tc = GNUNET_SCHEDULER_get_task_context ();
3238 if ((NULL != tc->read_ready) &&
3239 (GNUNET_NETWORK_fdset_isset (tc->read_ready,
3242 rlen = GNUNET_NETWORK_socket_recv (s5r->sock,
3243 &s5r->rbuf[s5r->rbuf_len],
3244 sizeof(s5r->rbuf) - s5r->rbuf_len);
3247 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3248 "socks5 client disconnected.\n");
3252 s5r->rbuf_len += rlen;
3254 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3258 "Processing %zu bytes of socks data in state %d\n",
3264 c_hello = (const struct Socks5ClientHelloMessage*) &s5r->rbuf;
3265 if ((s5r->rbuf_len < sizeof(struct Socks5ClientHelloMessage)) ||
3266 (s5r->rbuf_len < sizeof(struct Socks5ClientHelloMessage)
3267 + c_hello->num_auth_methods))
3268 return; /* need more data */
3269 if (SOCKS_VERSION_5 != c_hello->version)
3271 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3272 _ ("Unsupported socks version %d\n"),
3273 (int) c_hello->version);
3277 clear_from_s5r_rbuf (s5r,
3278 sizeof(struct Socks5ClientHelloMessage)
3279 + c_hello->num_auth_methods);
3280 GNUNET_assert (0 == s5r->wbuf_len);
3281 s_hello = (struct Socks5ServerHelloMessage *) &s5r->wbuf;
3282 s5r->wbuf_len = sizeof(struct Socks5ServerHelloMessage);
3283 s_hello->version = SOCKS_VERSION_5;
3284 s_hello->auth_method = SOCKS_AUTH_NONE;
3285 GNUNET_assert (NULL == s5r->wtask);
3286 s5r->wtask = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
3289 s5r->state = SOCKS5_REQUEST;
3292 case SOCKS5_REQUEST:
3293 c_req = (const struct Socks5ClientRequestMessage *) &s5r->rbuf;
3294 if (s5r->rbuf_len < sizeof(struct Socks5ClientRequestMessage))
3296 switch (c_req->command)
3298 case SOCKS5_CMD_TCP_STREAM:
3303 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3304 _ ("Unsupported socks command %d\n"),
3305 (int) c_req->command);
3306 signal_socks_failure (s5r,
3307 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED);
3310 switch (c_req->addr_type)
3312 case SOCKS5_AT_IPV4:
3314 const struct in_addr *v4 = (const struct in_addr *) &c_req[1];
3315 const uint16_t *port = (const uint16_t *) &v4[1];
3316 struct sockaddr_in *in;
3318 s5r->port = ntohs (*port);
3319 alen = sizeof(struct in_addr);
3320 if (s5r->rbuf_len < sizeof(struct Socks5ClientRequestMessage)
3321 + alen + sizeof(uint16_t))
3322 return; /* need more data */
3323 in = (struct sockaddr_in *) &s5r->destination_address;
3324 in->sin_family = AF_INET;
3326 in->sin_port = *port;
3327 #if HAVE_SOCKADDR_IN_SIN_LEN
3328 in->sin_len = sizeof(*in);
3330 s5r->state = SOCKS5_DATA_TRANSFER;
3334 case SOCKS5_AT_IPV6:
3336 const struct in6_addr *v6 = (const struct in6_addr *) &c_req[1];
3337 const uint16_t *port = (const uint16_t *) &v6[1];
3338 struct sockaddr_in6 *in;
3340 s5r->port = ntohs (*port);
3341 alen = sizeof(struct in6_addr);
3342 if (s5r->rbuf_len < sizeof(struct Socks5ClientRequestMessage)
3343 + alen + sizeof(uint16_t))
3344 return; /* need more data */
3345 in = (struct sockaddr_in6 *) &s5r->destination_address;
3346 in->sin6_family = AF_INET6;
3347 in->sin6_addr = *v6;
3348 in->sin6_port = *port;
3349 #if HAVE_SOCKADDR_IN_SIN_LEN
3350 in->sin6_len = sizeof(*in);
3352 s5r->state = SOCKS5_DATA_TRANSFER;
3356 case SOCKS5_AT_DOMAINNAME:
3358 const uint8_t *dom_len;
3359 const char *dom_name;
3360 const uint16_t *port;
3362 dom_len = (const uint8_t *) &c_req[1];
3363 alen = *dom_len + 1;
3364 if (s5r->rbuf_len < sizeof(struct Socks5ClientRequestMessage)
3365 + alen + sizeof(uint16_t))
3366 return; /* need more data */
3367 dom_name = (const char *) &dom_len[1];
3368 port = (const uint16_t*) &dom_name[*dom_len];
3369 s5r->domain = GNUNET_strndup (dom_name,
3371 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3372 "Requested connection is to %s:%d\n",
3373 // (HTTPS_PORT == s5r->port) ? "s" : "",
3376 s5r->state = SOCKS5_RESOLVING;
3377 s5r->port = ntohs (*port);
3378 s5r->is_tls = (HTTPS_PORT == s5r->port) ? GNUNET_YES : GNUNET_NO;
3379 s5r->gns_lookup = GNUNET_GNS_lookup_with_tld (gns_handle,
3381 GNUNET_DNSPARSER_TYPE_A,
3382 GNUNET_NO /* only cached */,
3389 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3390 _ ("Unsupported socks address type %d\n"),
3391 (int) c_req->addr_type);
3392 signal_socks_failure (s5r,
3393 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED);
3396 clear_from_s5r_rbuf (s5r,
3397 sizeof(struct Socks5ClientRequestMessage)
3398 + alen + sizeof(uint16_t));
3399 if (0 != s5r->rbuf_len)
3401 /* read more bytes than healthy, why did the client send more!? */
3402 GNUNET_break_op (0);
3403 signal_socks_failure (s5r,
3404 SOCKS5_STATUS_GENERAL_FAILURE);
3407 if (SOCKS5_DATA_TRANSFER == s5r->state)
3409 /* if we are not waiting for GNS resolution, signal success */
3410 signal_socks_success (s5r);
3412 /* We are done reading right now */
3413 GNUNET_SCHEDULER_cancel (s5r->rtask);
3417 case SOCKS5_RESOLVING:
3421 case SOCKS5_DATA_TRANSFER:
3433 * Accept new incoming connections
3435 * @param cls the closure with the lsock4 or lsock6
3436 * @param tc the scheduler context
3439 do_accept (void *cls)
3441 struct GNUNET_NETWORK_Handle *lsock = cls;
3442 struct GNUNET_NETWORK_Handle *s;
3443 struct Socks5Request *s5r;
3445 GNUNET_assert (NULL != lsock);
3446 if (lsock == lsock4)
3447 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3451 else if (lsock == lsock6)
3452 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3458 s = GNUNET_NETWORK_socket_accept (lsock,
3463 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3468 "Got an inbound connection, waiting for data\n");
3469 s5r = GNUNET_new (struct Socks5Request);
3470 GNUNET_CONTAINER_DLL_insert (s5r_head,
3474 s5r->state = SOCKS5_INIT;
3475 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3482 /* ******************* General / main code ********************* */
3486 * Task run on shutdown
3488 * @param cls closure
3491 do_shutdown (void *cls)
3493 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3494 "Shutting down...\n");
3495 /* MHD requires resuming before destroying the daemons */
3496 for (struct Socks5Request *s5r = s5r_head;
3502 s5r->suspended = GNUNET_NO;
3503 MHD_resume_connection (s5r->con);
3506 while (NULL != mhd_httpd_head)
3507 kill_httpd (mhd_httpd_head);
3508 while (NULL != s5r_head)
3509 cleanup_s5r (s5r_head);
3512 GNUNET_NETWORK_socket_close (lsock4);
3517 GNUNET_NETWORK_socket_close (lsock6);
3520 if (NULL != curl_multi)
3522 curl_multi_cleanup (curl_multi);
3525 if (NULL != gns_handle)
3527 GNUNET_GNS_disconnect (gns_handle);
3530 if (NULL != curl_download_task)
3532 GNUNET_SCHEDULER_cancel (curl_download_task);
3533 curl_download_task = NULL;
3537 GNUNET_SCHEDULER_cancel (ltask4);
3542 GNUNET_SCHEDULER_cancel (ltask6);
3545 gnutls_x509_crt_deinit (proxy_ca.cert);
3546 gnutls_x509_privkey_deinit (proxy_ca.key);
3547 gnutls_global_deinit ();
3552 * Create an IPv4 listen socket bound to our port.
3554 * @return NULL on error
3556 static struct GNUNET_NETWORK_Handle *
3559 struct GNUNET_NETWORK_Handle *ls;
3560 struct sockaddr_in sa4;
3563 memset (&sa4, 0, sizeof(sa4));
3564 sa4.sin_family = AF_INET;
3565 sa4.sin_port = htons (port);
3566 sa4.sin_addr.s_addr = address;
3567 #if HAVE_SOCKADDR_IN_SIN_LEN
3568 sa4.sin_len = sizeof(sa4);
3570 ls = GNUNET_NETWORK_socket_create (AF_INET,
3576 GNUNET_NETWORK_socket_bind (ls,
3577 (const struct sockaddr *) &sa4,
3581 GNUNET_NETWORK_socket_close (ls);
3590 * Create an IPv6 listen socket bound to our port.
3592 * @return NULL on error
3594 static struct GNUNET_NETWORK_Handle *
3597 struct GNUNET_NETWORK_Handle *ls;
3598 struct sockaddr_in6 sa6;
3601 memset (&sa6, 0, sizeof(sa6));
3602 sa6.sin6_family = AF_INET6;
3603 sa6.sin6_port = htons (port);
3604 sa6.sin6_addr = address6;
3605 #if HAVE_SOCKADDR_IN_SIN_LEN
3606 sa6.sin6_len = sizeof(sa6);
3608 ls = GNUNET_NETWORK_socket_create (AF_INET6,
3614 GNUNET_NETWORK_socket_bind (ls,
3615 (const struct sockaddr *) &sa6,
3619 GNUNET_NETWORK_socket_close (ls);
3628 * Main function that will be run
3630 * @param cls closure
3631 * @param args remaining command-line arguments
3632 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
3633 * @param c configuration
3638 const char *cfgfile,
3639 const struct GNUNET_CONFIGURATION_Handle *c)
3641 char*cafile_cfg = NULL;
3644 struct MhdHttpList *hd;
3648 /* Get address to bind to */
3649 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg, "gns-proxy",
3653 // No address specified
3654 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3655 "Don't know what to bind to...\n");
3656 GNUNET_free (addr_str);
3657 GNUNET_SCHEDULER_shutdown ();
3660 if (1 != inet_pton (AF_INET, addr_str, &address))
3662 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3663 "Unable to parse address %s\n",
3665 GNUNET_free (addr_str);
3666 GNUNET_SCHEDULER_shutdown ();
3669 GNUNET_free (addr_str);
3670 /* Get address to bind to */
3671 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg, "gns-proxy",
3675 // No address specified
3676 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3677 "Don't know what to bind6 to...\n");
3678 GNUNET_free (addr_str);
3679 GNUNET_SCHEDULER_shutdown ();
3682 if (1 != inet_pton (AF_INET6, addr_str, &address6))
3684 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3685 "Unable to parse IPv6 address %s\n",
3687 GNUNET_free (addr_str);
3688 GNUNET_SCHEDULER_shutdown ();
3691 GNUNET_free (addr_str);
3693 if (NULL == (curl_multi = curl_multi_init ()))
3695 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3696 "Failed to create cURL multi handle!\n");
3699 cafile = cafile_opt;
3703 GNUNET_CONFIGURATION_get_value_filename (cfg,
3708 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
3713 cafile = cafile_cfg;
3715 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3716 "Using `%s' as CA\n",
3719 gnutls_global_init ();
3720 gnutls_x509_crt_init (&proxy_ca.cert);
3721 gnutls_x509_privkey_init (&proxy_ca.key);
3724 load_cert_from_file (proxy_ca.cert,
3727 load_key_from_file (proxy_ca.key,
3730 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3731 _ ("Failed to load X.509 key and certificate from `%s'\n"),
3733 gnutls_x509_crt_deinit (proxy_ca.cert);
3734 gnutls_x509_privkey_deinit (proxy_ca.key);
3735 gnutls_global_deinit ();
3736 GNUNET_free_non_null (cafile_cfg);
3739 GNUNET_free_non_null (cafile_cfg);
3740 if (NULL == (gns_handle = GNUNET_GNS_connect (cfg)))
3742 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3743 "Unable to connect to GNS!\n");
3744 gnutls_x509_crt_deinit (proxy_ca.cert);
3745 gnutls_x509_privkey_deinit (proxy_ca.key);
3746 gnutls_global_deinit ();
3749 GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
3752 /* Open listen socket for socks proxy */
3753 lsock6 = bind_v6 ();
3756 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3762 GNUNET_NETWORK_socket_listen (lsock6,
3765 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3767 GNUNET_NETWORK_socket_close (lsock6);
3772 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3778 lsock4 = bind_v4 ();
3781 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3787 GNUNET_NETWORK_socket_listen (lsock4,
3790 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3792 GNUNET_NETWORK_socket_close (lsock4);
3797 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3803 if ((NULL == lsock4) &&
3806 GNUNET_SCHEDULER_shutdown ();
3809 if (0 != curl_global_init (CURL_GLOBAL_WIN32))
3811 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3812 "cURL global init failed!\n");
3813 GNUNET_SCHEDULER_shutdown ();
3816 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3817 "Proxy listens on port %u\n",
3818 (unsigned int) port);
3820 /* start MHD daemon for HTTP */
3821 hd = GNUNET_new (struct MhdHttpList);
3822 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_NO_LISTEN_SOCKET
3823 | MHD_ALLOW_SUSPEND_RESUME,
3826 &create_response, hd,
3827 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned
3829 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb,
3831 MHD_OPTION_NOTIFY_CONNECTION,
3832 &mhd_connection_cb, NULL,
3833 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback,
3836 if (NULL == hd->daemon)
3839 GNUNET_SCHEDULER_shutdown ();
3843 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
3850 * The main function for gnunet-gns-proxy.
3852 * @param argc number of arguments from the command line
3853 * @param argv command line arguments
3854 * @return 0 ok, 1 on error
3860 struct GNUNET_GETOPT_CommandLineOption options[] = {
3861 GNUNET_GETOPT_option_uint16 ('p',
3865 "listen on specified port (default: 7777)"),
3867 GNUNET_GETOPT_option_string ('a',
3870 gettext_noop ("pem file to use as CA"),
3872 GNUNET_GETOPT_option_flag ('6',
3874 gettext_noop ("disable use of IPv6"),
3877 GNUNET_GETOPT_OPTION_END
3879 static const char*page =
3880 "<html><head><title>gnunet-gns-proxy</title>"
3881 "</head><body>cURL fail</body></html>";
3885 GNUNET_STRINGS_get_utf8_args (argc, argv,
3888 GNUNET_log_setup ("gnunet-gns-proxy",
3891 curl_failure_response
3892 = MHD_create_response_from_buffer (strlen (page),
3894 MHD_RESPMEM_PERSISTENT);
3898 GNUNET_PROGRAM_run (argc, argv,
3900 _ ("GNUnet GNS proxy"),
3902 &run, NULL)) ? 0 : 1;
3903 MHD_destroy_response (curl_failure_response);
3904 GNUNET_free_non_null ((char *) argv);
3908 /* end of gnunet-gns-proxy.c */