2 This file is part of GNUnet.
3 Copyright (C) 2012-2014 GNUnet e.V.
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., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, 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
31 #include <microhttpd.h>
33 #include <curl/curl.h>
34 #elif HAVE_GNURL_CURL_H
35 #include <gnurl/curl.h>
37 #include <gnutls/gnutls.h>
38 #include <gnutls/x509.h>
39 #include <gnutls/abstract.h>
40 #include <gnutls/crypto.h>
42 #include <gnutls/dane.h>
45 #include "gnunet_util_lib.h"
46 #include "gnunet_gns_service.h"
47 #include "gnunet_identity_service.h"
52 * Default Socks5 listen port.
54 #define GNUNET_GNS_PROXY_PORT 7777
57 * Maximum supported length for a URI.
58 * Should die. @deprecated
60 #define MAX_HTTP_URI_LENGTH 2048
63 * Size of the buffer for the data upload / download. Must be
64 * enough for curl, thus CURL_MAX_WRITE_SIZE is needed here (16k).
66 #define IO_BUFFERSIZE CURL_MAX_WRITE_SIZE
69 * Size of the read/write buffers for Socks. Uses
70 * 256 bytes for the hostname (at most), plus a few
71 * bytes overhead for the messages.
73 #define SOCKS_BUFFERSIZE (256 + 32)
76 * Port for plaintext HTTP.
83 #define HTTPS_PORT 443
86 * Largest allowed size for a PEM certificate.
88 #define MAX_PEM_SIZE (10 * 1024)
91 * After how long do we clean up unused MHD SSL/TLS instances?
93 #define MHD_CACHE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
96 * After how long do we clean up Socks5 handles that failed to show any activity
97 * with their respective MHD instance?
99 #define HTTP_HANDSHAKE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
105 * @param level log level
106 * @param fun name of curl_easy-function that gave the error
107 * @param rc return code from curl
109 #define LOG_CURL_EASY(level,fun,rc) GNUNET_log(level, _("%s failed at %s:%d: `%s'\n"), fun, __FILE__, __LINE__, curl_easy_strerror (rc))
112 /* *************** Socks protocol definitions (move to TUN?) ****************** */
115 * Which SOCKS version do we speak?
117 #define SOCKS_VERSION_5 0x05
120 * Flag to set for 'no authentication'.
122 #define SOCKS_AUTH_NONE 0
126 * Commands in Socks5.
131 * Establish TCP/IP stream.
133 SOCKS5_CMD_TCP_STREAM = 1,
136 * Establish TCP port binding.
138 SOCKS5_CMD_TCP_PORT = 2,
141 * Establish UDP port binding.
143 SOCKS5_CMD_UDP_PORT = 3
148 * Address types in Socks5.
150 enum Socks5AddressType
160 SOCKS5_AT_DOMAINNAME = 3,
171 * Status codes in Socks5 response.
173 enum Socks5StatusCode
175 SOCKS5_STATUS_REQUEST_GRANTED = 0,
176 SOCKS5_STATUS_GENERAL_FAILURE = 1,
177 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE = 2,
178 SOCKS5_STATUS_NETWORK_UNREACHABLE = 3,
179 SOCKS5_STATUS_HOST_UNREACHABLE = 4,
180 SOCKS5_STATUS_CONNECTION_REFUSED_BY_HOST = 5,
181 SOCKS5_STATUS_TTL_EXPIRED = 6,
182 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED = 7,
183 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED = 8
188 * Client hello in Socks5 protocol.
190 struct Socks5ClientHelloMessage
193 * Should be #SOCKS_VERSION_5.
198 * How many authentication methods does the client support.
200 uint8_t num_auth_methods;
202 /* followed by supported authentication methods, 1 byte per method */
208 * Server hello in Socks5 protocol.
210 struct Socks5ServerHelloMessage
213 * Should be #SOCKS_VERSION_5.
218 * Chosen authentication method, for us always #SOCKS_AUTH_NONE,
219 * which skips the authentication step.
226 * Client socks request in Socks5 protocol.
228 struct Socks5ClientRequestMessage
231 * Should be #SOCKS_VERSION_5.
236 * Command code, we only uspport #SOCKS5_CMD_TCP_STREAM.
241 * Reserved, always zero.
246 * Address type, an `enum Socks5AddressType`.
251 * Followed by either an ip4/ipv6 address or a domain name with a
252 * length field (uint8_t) in front (depending on @e addr_type).
253 * followed by port number in network byte order (uint16_t).
259 * Server response to client requests in Socks5 protocol.
261 struct Socks5ServerResponseMessage
264 * Should be #SOCKS_VERSION_5.
269 * Status code, an `enum Socks5StatusCode`
279 * Address type, an `enum Socks5AddressType`.
284 * Followed by either an ip4/ipv6 address or a domain name with a
285 * length field (uint8_t) in front (depending on @e addr_type).
286 * followed by port number in network byte order (uint16_t).
293 /* *********************** Datastructures for HTTP handling ****************** */
296 * A structure for CA cert/key
303 gnutls_x509_crt_t cert;
308 gnutls_x509_privkey_t key;
313 * Structure for GNS certificates
315 struct ProxyGNSCertificate
318 * The certificate as PEM
320 char cert[MAX_PEM_SIZE];
323 * The private key as PEM
325 char key[MAX_PEM_SIZE];
331 * A structure for all running Httpds
338 struct MhdHttpList *prev;
343 struct MhdHttpList *next;
346 * the domain name to server (only important for SSL)
353 struct MHD_Daemon *daemon;
356 * Optional proxy certificate used
358 struct ProxyGNSCertificate *proxy_cert;
363 struct GNUNET_SCHEDULER_Task *httpd_task;
366 * is this an ssl daemon?
373 /* ***************** Datastructures for Socks handling **************** */
382 * We're waiting to get the client hello.
387 * We're waiting to get the initial request.
392 * We are currently resolving the destination.
397 * We're in transfer mode.
399 SOCKS5_DATA_TRANSFER,
402 * Finish writing the write buffer, then clean up.
404 SOCKS5_WRITE_THEN_CLEANUP,
407 * Socket has been passed to MHD, do not close it anymore.
409 SOCKS5_SOCKET_WITH_MHD,
412 * We've started receiving upload data from MHD.
414 SOCKS5_SOCKET_UPLOAD_STARTED,
417 * We've finished receiving upload data from MHD.
419 SOCKS5_SOCKET_UPLOAD_DONE,
422 * We've finished uploading data via CURL and can now download.
424 SOCKS5_SOCKET_DOWNLOAD_STARTED,
427 * We've finished receiving download data from cURL.
429 SOCKS5_SOCKET_DOWNLOAD_DONE
436 struct HttpResponseHeader
441 struct HttpResponseHeader *next;
446 struct HttpResponseHeader *prev;
460 * A structure for socks requests
468 struct Socks5Request *next;
473 struct Socks5Request *prev;
478 struct GNUNET_NETWORK_Handle *sock;
481 * Handle to GNS lookup, during #SOCKS5_RESOLVING phase.
483 struct GNUNET_GNS_LookupRequest *gns_lookup;
486 * Client socket read task
488 struct GNUNET_SCHEDULER_Task * rtask;
491 * Client socket write task
493 struct GNUNET_SCHEDULER_Task * wtask;
498 struct GNUNET_SCHEDULER_Task * timeout_task;
503 char rbuf[SOCKS_BUFFERSIZE];
508 char wbuf[SOCKS_BUFFERSIZE];
511 * Buffer we use for moving data between MHD and curl (in both directions).
513 char io_buf[IO_BUFFERSIZE];
516 * MHD HTTP instance handling this request, NULL for none.
518 struct MhdHttpList *hd;
521 * MHD response object for this request.
523 struct MHD_Response *response;
526 * the domain name to server (only important for SSL)
531 * DNS Legacy Host Name as given by GNS, NULL if not given.
536 * Payload of the (last) DANE record encountered.
551 * HTTP request headers for the curl request.
553 struct curl_slist *headers;
556 * DNS->IP mappings resolved through GNS
558 struct curl_slist *hosts;
561 * HTTP response code to give to MHD for the response.
563 unsigned int response_code;
566 * Number of bytes in @e dane_data.
568 size_t dane_data_len;
571 * Number of bytes already in read buffer
576 * Number of bytes already in write buffer
581 * Number of bytes already in the IO buffer.
586 * Once known, what's the target address for the connection?
588 struct sockaddr_storage destination_address;
593 enum SocksPhase state;
596 * Desired destination port.
601 * Headers from response
603 struct HttpResponseHeader *header_head;
606 * Headers from response
608 struct HttpResponseHeader *header_tail;
611 * SSL Certificate status
618 /* *********************** Globals **************************** */
622 * The port the proxy is running on (default 7777)
624 static unsigned long port = GNUNET_GNS_PROXY_PORT;
627 * The CA file (pem) to use for the proxy CA
629 static char *cafile_opt;
632 * The listen socket of the proxy for IPv4
634 static struct GNUNET_NETWORK_Handle *lsock4;
637 * The listen socket of the proxy for IPv6
639 static struct GNUNET_NETWORK_Handle *lsock6;
642 * The listen task ID for IPv4
644 static struct GNUNET_SCHEDULER_Task * ltask4;
647 * The listen task ID for IPv6
649 static struct GNUNET_SCHEDULER_Task * ltask6;
652 * The cURL download task (curl multi API).
654 static struct GNUNET_SCHEDULER_Task * curl_download_task;
657 * The cURL multi handle
659 static CURLM *curl_multi;
662 * Handle to the GNS service
664 static struct GNUNET_GNS_Handle *gns_handle;
667 * DLL for http/https daemons
669 static struct MhdHttpList *mhd_httpd_head;
672 * DLL for http/https daemons
674 static struct MhdHttpList *mhd_httpd_tail;
677 * Daemon for HTTP (we have one per SSL certificate, and then one for
678 * all HTTP connections; this is the one for HTTP, not HTTPS).
680 static struct MhdHttpList *httpd;
683 * DLL of active socks requests.
685 static struct Socks5Request *s5r_head;
688 * DLL of active socks requests.
690 static struct Socks5Request *s5r_tail;
693 * The users local GNS master zone
695 static struct GNUNET_CRYPTO_EcdsaPublicKey local_gns_zone;
698 * The users local shorten zone
700 static struct GNUNET_CRYPTO_EcdsaPrivateKey local_shorten_zone;
703 * Is shortening enabled?
705 static int do_shorten;
708 * The CA for SSL certificate generation
710 static struct ProxyCA proxy_ca;
713 * Response we return on cURL failures.
715 static struct MHD_Response *curl_failure_response;
718 * Connection to identity service.
720 static struct GNUNET_IDENTITY_Handle *identity;
723 * Request for our ego.
725 static struct GNUNET_IDENTITY_Operation *id_op;
730 static const struct GNUNET_CONFIGURATION_Handle *cfg;
733 /* ************************* Global helpers ********************* */
737 * Run MHD now, we have extra data ready for the callback.
739 * @param hd the daemon to run now.
742 run_mhd_now (struct MhdHttpList *hd);
746 * Clean up s5r handles.
748 * @param s5r the handle to destroy
751 cleanup_s5r (struct Socks5Request *s5r)
753 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
754 "Cleaning up socks request\n");
755 if (NULL != s5r->curl)
757 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
758 "Cleaning up cURL handle\n");
759 curl_multi_remove_handle (curl_multi, s5r->curl);
760 curl_easy_cleanup (s5r->curl);
763 curl_slist_free_all (s5r->headers);
764 if (NULL != s5r->hosts)
766 curl_slist_free_all (s5r->hosts);
768 if ( (NULL != s5r->response) &&
769 (curl_failure_response != s5r->response) )
770 MHD_destroy_response (s5r->response);
771 if (NULL != s5r->rtask)
772 GNUNET_SCHEDULER_cancel (s5r->rtask);
773 if (NULL != s5r->timeout_task)
774 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
775 if (NULL != s5r->wtask)
776 GNUNET_SCHEDULER_cancel (s5r->wtask);
777 if (NULL != s5r->gns_lookup)
778 GNUNET_GNS_lookup_cancel (s5r->gns_lookup);
779 if (NULL != s5r->sock)
781 if (SOCKS5_SOCKET_WITH_MHD <= s5r->state)
782 GNUNET_NETWORK_socket_free_memory_only_ (s5r->sock);
784 GNUNET_NETWORK_socket_close (s5r->sock);
786 GNUNET_CONTAINER_DLL_remove (s5r_head,
789 GNUNET_free_non_null (s5r->domain);
790 GNUNET_free_non_null (s5r->leho);
791 GNUNET_free_non_null (s5r->url);
792 GNUNET_free_non_null (s5r->dane_data);
797 /* ************************* HTTP handling with cURL *********************** */
801 * Callback for MHD response generation. This function is called from
802 * MHD whenever MHD expects to get data back. Copies data from the
803 * io_buf, if available.
805 * @param cls closure with our `struct Socks5Request`
806 * @param pos in buffer
807 * @param buf where to copy data
808 * @param max available space in @a buf
809 * @return number of bytes written to @a buf
812 mhd_content_cb (void *cls,
817 struct Socks5Request *s5r = cls;
818 size_t bytes_to_copy;
820 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
821 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
823 /* we're still not done with the upload, do not yet
824 start the download, the IO buffer is still full
826 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
827 "Pausing MHD download, not yet ready for download\n");
828 return 0; /* not yet ready for data download */
830 bytes_to_copy = GNUNET_MIN (max,
832 if ( (0 == bytes_to_copy) &&
833 (SOCKS5_SOCKET_DOWNLOAD_DONE != s5r->state) )
835 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
836 "Pausing MHD download, no data available\n");
837 return 0; /* more data later */
839 if ( (0 == bytes_to_copy) &&
840 (SOCKS5_SOCKET_DOWNLOAD_DONE == s5r->state) )
842 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
843 "Completed MHD download\n");
844 return MHD_CONTENT_READER_END_OF_STREAM;
846 GNUNET_memcpy (buf, s5r->io_buf, bytes_to_copy);
847 memmove (s5r->io_buf,
848 &s5r->io_buf[bytes_to_copy],
849 s5r->io_len - bytes_to_copy);
850 s5r->io_len -= bytes_to_copy;
851 if (NULL != s5r->curl)
852 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
853 return bytes_to_copy;
858 * Check that the website has presented us with a valid SSL certificate.
859 * The certificate must either match the domain name or the LEHO name
860 * (or, if available, the TLSA record).
862 * @param s5r request to check for.
863 * @return #GNUNET_OK if the certificate is valid
866 check_ssl_certificate (struct Socks5Request *s5r)
868 unsigned int cert_list_size;
869 const gnutls_datum_t *chainp;
870 const struct curl_tlssessioninfo *tlsinfo;
871 char certdn[GNUNET_DNSPARSER_MAX_NAME_LENGTH + 3];
873 gnutls_x509_crt_t x509_cert;
877 s5r->ssl_checked = GNUNET_YES;
878 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "XXXXXX\n");
880 curl_easy_getinfo (s5r->curl,
881 CURLINFO_TLS_SESSION,
882 (struct curl_slist **) &tlsinfo))
883 return GNUNET_SYSERR;
884 if (CURLSSLBACKEND_GNUTLS != tlsinfo->backend)
886 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
887 _("Unsupported CURL SSL backend %d\n"),
889 return GNUNET_SYSERR;
891 chainp = gnutls_certificate_get_peers (tlsinfo->internals, &cert_list_size);
892 if ( (! chainp) || (0 == cert_list_size) )
893 return GNUNET_SYSERR;
895 size = sizeof (certdn);
896 /* initialize an X.509 certificate structure. */
897 gnutls_x509_crt_init (&x509_cert);
898 gnutls_x509_crt_import (x509_cert,
900 GNUTLS_X509_FMT_DER);
902 if (0 != (rc = gnutls_x509_crt_get_dn_by_oid (x509_cert,
903 GNUTLS_OID_X520_COMMON_NAME,
904 0, /* the first and only one */
905 0 /* no DER encoding */,
909 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
910 _("Failed to fetch CN from cert: %s\n"),
911 gnutls_strerror(rc));
912 gnutls_x509_crt_deinit (x509_cert);
913 return GNUNET_SYSERR;
915 /* check for TLSA/DANE records */
917 if (NULL != s5r->dane_data)
919 char *dd[] = { s5r->dane_data, NULL };
920 int dlen[] = { s5r->dane_data_len, 0};
921 dane_state_t dane_state;
922 dane_query_t dane_query;
925 /* FIXME: add flags to gnutls to NOT read UNBOUND_ROOT_KEY_FILE here! */
926 if (0 != (rc = dane_state_init (&dane_state,
927 #ifdef DANE_F_IGNORE_DNSSEC
928 DANE_F_IGNORE_DNSSEC |
930 DANE_F_IGNORE_LOCAL_RESOLVER)))
932 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
933 _("Failed to initialize DANE: %s\n"),
935 gnutls_x509_crt_deinit (x509_cert);
936 return GNUNET_SYSERR;
938 if (0 != (rc = dane_raw_tlsa (dane_state,
945 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
946 _("Failed to parse DANE record: %s\n"),
948 dane_state_deinit (dane_state);
949 gnutls_x509_crt_deinit (x509_cert);
950 return GNUNET_SYSERR;
952 if (0 != (rc = dane_verify_crt_raw (dane_state,
955 gnutls_certificate_type_get (tlsinfo->internals),
960 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
961 _("Failed to verify TLS connection using DANE: %s\n"),
963 dane_query_deinit (dane_query);
964 dane_state_deinit (dane_state);
965 gnutls_x509_crt_deinit (x509_cert);
966 return GNUNET_SYSERR;
970 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
971 _("Failed DANE verification failed with GnuTLS verify status code: %u\n"),
973 dane_query_deinit (dane_query);
974 dane_state_deinit (dane_state);
975 gnutls_x509_crt_deinit (x509_cert);
976 return GNUNET_SYSERR;
978 dane_query_deinit (dane_query);
979 dane_state_deinit (dane_state);
985 /* try LEHO or ordinary domain name X509 verification */
987 if (NULL != s5r->leho)
991 if (0 == (rc = gnutls_x509_crt_check_hostname (x509_cert,
994 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
995 _("SSL certificate subject name (%s) does not match `%s'\n"),
998 gnutls_x509_crt_deinit (x509_cert);
999 return GNUNET_SYSERR;
1004 /* we did not even have the domain name!? */
1006 return GNUNET_SYSERR;
1009 gnutls_x509_crt_deinit (x509_cert);
1015 * We're getting an HTTP response header from cURL. Convert it to the
1016 * MHD response headers. Mostly copies the headers, but makes special
1017 * adjustments to "Set-Cookie" and "Location" headers as those may need
1018 * to be changed from the LEHO to the domain the browser expects.
1020 * @param buffer curl buffer with a single line of header data; not 0-terminated!
1021 * @param size curl blocksize
1022 * @param nmemb curl blocknumber
1023 * @param cls our `struct Socks5Request *`
1024 * @return size of processed bytes
1027 curl_check_hdr (void *buffer, size_t size, size_t nmemb, void *cls)
1029 struct Socks5Request *s5r = cls;
1030 struct HttpResponseHeader *header;
1031 size_t bytes = size * nmemb;
1033 const char *hdr_type;
1034 const char *cookie_domain;
1036 char *new_cookie_hdr;
1039 size_t delta_cdomain;
1043 /* first, check SSL certificate */
1044 if ((GNUNET_YES != s5r->ssl_checked) &&
1045 (HTTPS_PORT == s5r->port))
1047 if (GNUNET_OK != check_ssl_certificate (s5r))
1051 ndup = GNUNET_strndup (buffer, bytes);
1052 hdr_type = strtok (ndup, ":");
1053 if (NULL == hdr_type)
1058 hdr_val = strtok (NULL, "");
1059 if (NULL == hdr_val)
1064 if (' ' == *hdr_val)
1067 /* custom logic for certain header types */
1068 new_cookie_hdr = NULL;
1069 if ( (NULL != s5r->leho) &&
1070 (0 == strcasecmp (hdr_type,
1071 MHD_HTTP_HEADER_SET_COOKIE)) )
1074 new_cookie_hdr = GNUNET_malloc (strlen (hdr_val) +
1075 strlen (s5r->domain) + 1);
1077 domain_matched = GNUNET_NO; /* make sure we match domain at most once */
1078 for (tok = strtok (hdr_val, ";"); NULL != tok; tok = strtok (NULL, ";"))
1080 if ( (0 == strncasecmp (tok, " domain", strlen (" domain"))) &&
1081 (GNUNET_NO == domain_matched) )
1083 domain_matched = GNUNET_YES;
1084 cookie_domain = tok + strlen (" domain") + 1;
1085 if (strlen (cookie_domain) < strlen (s5r->leho))
1087 delta_cdomain = strlen (s5r->leho) - strlen (cookie_domain);
1088 if (0 == strcasecmp (cookie_domain, s5r->leho + delta_cdomain))
1090 offset += sprintf (new_cookie_hdr + offset,
1096 else if (0 == strcmp (cookie_domain, s5r->leho))
1098 offset += sprintf (new_cookie_hdr + offset,
1103 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1104 _("Cookie domain `%s' supplied by server is invalid\n"),
1107 GNUNET_memcpy (new_cookie_hdr + offset, tok, strlen (tok));
1108 offset += strlen (tok);
1109 new_cookie_hdr[offset++] = ';';
1111 hdr_val = new_cookie_hdr;
1114 new_location = NULL;
1115 if (0 == strcasecmp (MHD_HTTP_HEADER_LOCATION, hdr_type))
1119 GNUNET_asprintf (&leho_host,
1120 (HTTPS_PORT != s5r->port)
1124 if (0 == strncmp (leho_host,
1126 strlen (leho_host)))
1128 GNUNET_asprintf (&new_location,
1130 (HTTPS_PORT != s5r->port)
1134 hdr_val + strlen (leho_host));
1135 hdr_val = new_location;
1137 GNUNET_free (leho_host);
1139 /* MHD does not allow certain characters in values, remove those */
1140 if (NULL != (tok = strchr (hdr_val, '\n')))
1142 if (NULL != (tok = strchr (hdr_val, '\r')))
1144 if (NULL != (tok = strchr (hdr_val, '\t')))
1146 if (0 != strlen (hdr_val)) /* Rely in MHD to set those */
1148 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1149 "Adding header %s: %s to MHD response\n",
1152 header = GNUNET_new (struct HttpResponseHeader);
1153 header->type = GNUNET_strndup (hdr_type, strlen (hdr_type));
1154 header->value = GNUNET_strndup (hdr_val, strlen (hdr_val));
1155 GNUNET_CONTAINER_DLL_insert (s5r->header_head,
1160 GNUNET_free_non_null (new_cookie_hdr);
1161 GNUNET_free_non_null (new_location);
1166 create_mhd_response_from_s5r (struct Socks5Request *s5r)
1169 double content_length;
1170 struct HttpResponseHeader *header;
1172 if (NULL != s5r->response)
1174 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1175 "Response already set!\n");
1176 return GNUNET_SYSERR;
1179 GNUNET_break (CURLE_OK ==
1180 curl_easy_getinfo (s5r->curl,
1181 CURLINFO_RESPONSE_CODE,
1183 GNUNET_break (CURLE_OK ==
1184 curl_easy_getinfo (s5r->curl,
1185 CURLINFO_CONTENT_LENGTH_DOWNLOAD,
1187 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1188 "Creating MHD response with code %d and size %d\n",
1189 (int) resp_code, (int) content_length);
1190 s5r->response_code = resp_code;
1191 s5r->response = MHD_create_response_from_callback ((-1 == content_length) ? MHD_SIZE_UNKNOWN : content_length,
1196 for (header = s5r->header_head; NULL != header; header = header->next)
1198 GNUNET_break (MHD_YES ==
1199 MHD_add_response_header (s5r->response,
1204 if (NULL != s5r->leho)
1208 GNUNET_asprintf (&cors_hdr,
1209 (HTTPS_PORT == s5r->port)
1214 GNUNET_break (MHD_YES ==
1215 MHD_add_response_header (s5r->response,
1216 MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN,
1218 GNUNET_free (cors_hdr);
1220 /* force connection to be closed after each request, as we
1221 do not support HTTP pipelining (yet, FIXME!) */
1222 /*GNUNET_break (MHD_YES ==
1223 MHD_add_response_header (s5r->response,
1224 MHD_HTTP_HEADER_CONNECTION,
1230 * Handle response payload data from cURL. Copies it into our `io_buf` to make
1231 * it available to MHD.
1233 * @param ptr pointer to the data
1234 * @param size number of blocks of data
1235 * @param nmemb blocksize
1236 * @param ctx our `struct Socks5Request *`
1237 * @return number of bytes handled
1240 curl_download_cb (void *ptr, size_t size, size_t nmemb, void* ctx)
1242 struct Socks5Request *s5r = ctx;
1243 size_t total = size * nmemb;
1245 if (NULL == s5r->response)
1246 GNUNET_assert (GNUNET_OK == create_mhd_response_from_s5r (s5r));
1248 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
1249 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1251 /* we're still not done with the upload, do not yet
1252 start the download, the IO buffer is still full
1253 with upload data. */
1254 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1255 "Pausing CURL download, waiting for UPLOAD to finish\n");
1256 return CURL_WRITEFUNC_PAUSE; /* not yet ready for data download */
1258 if (sizeof (s5r->io_buf) - s5r->io_len < total)
1260 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1261 "Pausing CURL download, not enough space\n");
1262 return CURL_WRITEFUNC_PAUSE; /* not enough space */
1264 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
1267 s5r->io_len += total;
1268 if (s5r->io_len == total)
1269 run_mhd_now (s5r->hd);
1275 * cURL callback for uploaded (PUT/POST) data. Copies it into our `io_buf`
1276 * to make it available to MHD.
1278 * @param buf where to write the data
1279 * @param size number of bytes per member
1280 * @param nmemb number of members available in @a buf
1281 * @param cls our `struct Socks5Request` that generated the data
1282 * @return number of bytes copied to @a buf
1285 curl_upload_cb (void *buf, size_t size, size_t nmemb, void *cls)
1287 struct Socks5Request *s5r = cls;
1288 size_t len = size * nmemb;
1291 if ( (0 == s5r->io_len) &&
1292 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1294 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1295 "Pausing CURL UPLOAD, need more data\n");
1296 return CURL_READFUNC_PAUSE;
1298 if ( (0 == s5r->io_len) &&
1299 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1301 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1302 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1303 "Completed CURL UPLOAD\n");
1304 return 0; /* upload finished, can now download */
1306 if ( (SOCKS5_SOCKET_UPLOAD_STARTED != s5r->state) &&
1307 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1310 return CURL_READFUNC_ABORT;
1312 to_copy = GNUNET_MIN (s5r->io_len,
1314 GNUNET_memcpy (buf, s5r->io_buf, to_copy);
1315 memmove (s5r->io_buf,
1316 &s5r->io_buf[to_copy],
1317 s5r->io_len - to_copy);
1318 s5r->io_len -= to_copy;
1319 if (s5r->io_len + to_copy == sizeof (s5r->io_buf))
1320 run_mhd_now (s5r->hd); /* got more space for upload now */
1325 /* ************************** main loop of cURL interaction ****************** */
1329 * Task that is run when we are ready to receive more data
1332 * @param cls closure
1335 curl_task_download (void *cls);
1339 * Ask cURL for the select() sets and schedule cURL operations.
1342 curl_download_prepare ()
1349 struct GNUNET_NETWORK_FDSet *grs;
1350 struct GNUNET_NETWORK_FDSet *gws;
1352 struct GNUNET_TIME_Relative rtime;
1354 if (NULL != curl_download_task)
1356 GNUNET_SCHEDULER_cancel (curl_download_task);
1357 curl_download_task = NULL;
1363 if (CURLM_OK != (mret = curl_multi_fdset (curl_multi, &rs, &ws, &es, &max)))
1365 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1366 "%s failed at %s:%d: `%s'\n",
1367 "curl_multi_fdset", __FILE__, __LINE__,
1368 curl_multi_strerror (mret));
1372 GNUNET_break (CURLM_OK == curl_multi_timeout (curl_multi, &to));
1374 rtime = GNUNET_TIME_UNIT_FOREVER_REL;
1376 rtime = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, to);
1379 grs = GNUNET_NETWORK_fdset_create ();
1380 gws = GNUNET_NETWORK_fdset_create ();
1381 GNUNET_NETWORK_fdset_copy_native (grs, &rs, max + 1);
1382 GNUNET_NETWORK_fdset_copy_native (gws, &ws, max + 1);
1383 curl_download_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1386 &curl_task_download, curl_multi);
1387 GNUNET_NETWORK_fdset_destroy (gws);
1388 GNUNET_NETWORK_fdset_destroy (grs);
1392 curl_download_task = GNUNET_SCHEDULER_add_delayed (rtime,
1393 &curl_task_download,
1400 * Task that is run when we are ready to receive more data from curl.
1402 * @param cls closure, NULL
1405 curl_task_download (void *cls)
1409 struct CURLMsg *msg;
1411 struct Socks5Request *s5r;
1413 curl_download_task = NULL;
1417 mret = curl_multi_perform (curl_multi, &running);
1418 while (NULL != (msg = curl_multi_info_read (curl_multi, &msgnum)))
1420 GNUNET_break (CURLE_OK ==
1421 curl_easy_getinfo (msg->easy_handle,
1432 /* documentation says this is not used */
1436 switch (msg->data.result)
1439 case CURLE_GOT_NOTHING:
1440 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1441 "CURL download completed.\n");
1442 if (NULL == s5r->response)
1443 GNUNET_assert (GNUNET_OK == create_mhd_response_from_s5r (s5r));
1444 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1445 run_mhd_now (s5r->hd);
1448 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1449 "Download curl failed: %s\n",
1450 curl_easy_strerror (msg->data.result));
1451 /* FIXME: indicate error somehow? close MHD connection badly as well? */
1452 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1453 run_mhd_now (s5r->hd);
1456 if (NULL == s5r->response)
1457 s5r->response = curl_failure_response;
1460 /* documentation says this is not used */
1464 /* unexpected status code */
1469 } while (mret == CURLM_CALL_MULTI_PERFORM);
1470 if (CURLM_OK != mret)
1471 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1472 "%s failed at %s:%d: `%s'\n",
1473 "curl_multi_perform", __FILE__, __LINE__,
1474 curl_multi_strerror (mret));
1477 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1478 "Suspending cURL multi loop, no more events pending\n");
1479 return; /* nothing more in progress */
1481 curl_download_prepare ();
1485 /* ********************************* MHD response generation ******************* */
1489 * Read HTTP request header field from the request. Copies the fields
1490 * over to the 'headers' that will be given to curl. However, 'Host'
1491 * is substituted with the LEHO if present. We also change the
1492 * 'Connection' header value to "close" as the proxy does not support
1495 * @param cls our `struct Socks5Request`
1496 * @param kind value kind
1497 * @param key field key
1498 * @param value field value
1499 * @return MHD_YES to continue to iterate
1502 con_val_iter (void *cls,
1503 enum MHD_ValueKind kind,
1507 struct Socks5Request *s5r = cls;
1510 if ( (0 == strcasecmp (MHD_HTTP_HEADER_HOST, key)) &&
1511 (NULL != s5r->leho) )
1513 if (0 == strcasecmp (MHD_HTTP_HEADER_CONTENT_LENGTH, key))
1515 if (0 == strcasecmp (MHD_HTTP_HEADER_ACCEPT_ENCODING, key))
1517 GNUNET_asprintf (&hdr,
1521 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1522 "Adding HEADER `%s' to HTTP request\n",
1524 s5r->headers = curl_slist_append (s5r->headers,
1532 * Main MHD callback for handling requests.
1535 * @param con MHD connection handle
1536 * @param url the url in the request
1537 * @param meth the HTTP method used ("GET", "PUT", etc.)
1538 * @param ver the HTTP version string (i.e. "HTTP/1.1")
1539 * @param upload_data the data being uploaded (excluding HEADERS,
1540 * for a POST that fits into memory and that is encoded
1541 * with a supported encoding, the POST data will NOT be
1542 * given in upload_data and is instead available as
1543 * part of MHD_get_connection_values; very large POST
1544 * data *will* be made available incrementally in
1546 * @param upload_data_size set initially to the size of the
1547 * @a upload_data provided; the method must update this
1548 * value to the number of bytes NOT processed;
1549 * @param con_cls pointer to location where we store the 'struct Request'
1550 * @return MHD_YES if the connection was handled successfully,
1551 * MHD_NO if the socket must be closed due to a serious
1552 * error while handling the request
1555 create_response (void *cls,
1556 struct MHD_Connection *con,
1560 const char *upload_data,
1561 size_t *upload_data_size,
1564 struct Socks5Request *s5r = *con_cls;
1567 char ipstring[INET6_ADDRSTRLEN];
1568 char ipaddr[INET6_ADDRSTRLEN + 2];
1569 const struct sockaddr *sa;
1570 const struct sockaddr_in *s4;
1571 const struct sockaddr_in6 *s6;
1581 if (SOCKS5_SOCKET_WITH_MHD == s5r->state)
1583 /* first time here, initialize curl handle */
1584 sa = (const struct sockaddr *) &s5r->destination_address;
1585 switch (sa->sa_family)
1588 s4 = (const struct sockaddr_in *) &s5r->destination_address;
1589 if (NULL == inet_ntop (AF_INET,
1597 GNUNET_snprintf (ipaddr,
1601 port = ntohs (s4->sin_port);
1604 s6 = (const struct sockaddr_in6 *) &s5r->destination_address;
1605 if (NULL == inet_ntop (AF_INET6,
1613 GNUNET_snprintf (ipaddr,
1617 port = ntohs (s6->sin6_port);
1623 if (NULL == s5r->curl)
1624 s5r->curl = curl_easy_init ();
1625 if (NULL == s5r->curl)
1626 return MHD_queue_response (con,
1627 MHD_HTTP_INTERNAL_SERVER_ERROR,
1628 curl_failure_response);
1629 curl_easy_setopt (s5r->curl, CURLOPT_HEADERFUNCTION, &curl_check_hdr);
1630 curl_easy_setopt (s5r->curl, CURLOPT_HEADERDATA, s5r);
1631 curl_easy_setopt (s5r->curl, CURLOPT_FOLLOWLOCATION, 0);
1632 curl_easy_setopt (s5r->curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
1633 curl_easy_setopt (s5r->curl, CURLOPT_CONNECTTIMEOUT, 600L);
1634 curl_easy_setopt (s5r->curl, CURLOPT_TIMEOUT, 600L);
1635 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1636 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_CONTENT_DECODING, 0);
1637 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_TRANSFER_DECODING, 0);
1638 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1639 curl_easy_setopt (s5r->curl, CURLOPT_PRIVATE, s5r);
1640 curl_easy_setopt (s5r->curl, CURLOPT_VERBOSE, 0);
1642 * Pre-populate cache to resolve Hostname.
1643 * This is necessary as the DNS name in the CURLOPT_URL is used
1644 * for SNI http://de.wikipedia.org/wiki/Server_Name_Indication
1646 if (NULL != s5r->leho)
1648 GNUNET_asprintf (&curl_hosts,
1653 s5r->hosts = curl_slist_append(NULL, curl_hosts);
1654 curl_easy_setopt(s5r->curl, CURLOPT_RESOLVE, s5r->hosts);
1655 GNUNET_free (curl_hosts);
1657 GNUNET_asprintf (&curlurl,
1658 (HTTPS_PORT != s5r->port)
1660 : "https://%s:%d%s",
1666 curl_easy_setopt (s5r->curl,
1669 GNUNET_free (curlurl);
1670 if (0 == strcasecmp (meth, MHD_HTTP_METHOD_PUT))
1672 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1673 curl_easy_setopt (s5r->curl, CURLOPT_UPLOAD, 1);
1674 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1675 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1676 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1677 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1679 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_POST))
1681 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1682 curl_easy_setopt (s5r->curl, CURLOPT_POST, 1L);
1683 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1684 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1685 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1686 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1688 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_HEAD))
1690 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1691 curl_easy_setopt (s5r->curl, CURLOPT_NOBODY, 1);
1693 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_OPTIONS))
1695 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1696 curl_easy_setopt (s5r->curl, CURLOPT_CUSTOMREQUEST, "OPTIONS");
1698 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_GET))
1700 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1701 curl_easy_setopt (s5r->curl, CURLOPT_HTTPGET, 1);
1702 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1703 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1707 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1708 _("Unsupported HTTP method `%s'\n"),
1710 curl_easy_cleanup (s5r->curl);
1715 if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_0))
1717 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
1719 else if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_1))
1721 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
1725 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_NONE);
1728 if (HTTPS_PORT == s5r->port)
1730 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);
1731 if (NULL != s5r->dane_data)
1732 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYPEER, 0L);
1734 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYPEER, 1L);
1735 /* Disable cURL checking the hostname, as we will check ourselves
1736 as only we have the domain name or the LEHO or the DANE record */
1737 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYHOST, 0L);
1741 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_NONE);
1744 if (CURLM_OK != curl_multi_add_handle (curl_multi, s5r->curl))
1747 curl_easy_cleanup (s5r->curl);
1751 MHD_get_connection_values (con,
1753 &con_val_iter, s5r);
1754 curl_easy_setopt (s5r->curl, CURLOPT_HTTPHEADER, s5r->headers);
1755 curl_download_prepare ();
1759 /* continuing to process request */
1760 if (0 != *upload_data_size)
1763 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1764 "Processing %u bytes UPLOAD\n",
1765 (unsigned int) *upload_data_size);
1767 /* FIXME: This must be set or a header with Transfer-Encoding: chunked. Else
1768 * upload callback is not called!
1770 curl_easy_setopt (s5r->curl, CURLOPT_POSTFIELDSIZE, *upload_data_size);
1772 left = GNUNET_MIN (*upload_data_size,
1773 sizeof (s5r->io_buf) - s5r->io_len);
1774 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
1777 s5r->io_len += left;
1778 *upload_data_size -= left;
1779 GNUNET_assert (NULL != s5r->curl);
1780 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
1783 if (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state)
1785 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1786 "Finished processing UPLOAD\n");
1787 s5r->state = SOCKS5_SOCKET_UPLOAD_DONE;
1789 if (NULL == s5r->response)
1791 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1792 "Queueing response with MHD\n");
1793 run_mhd_now (s5r->hd);
1794 return MHD_queue_response (con,
1800 /* ******************** MHD HTTP setup and event loop ******************** */
1804 * Function called when MHD decides that we are done with a request.
1807 * @param connection connection handle
1808 * @param con_cls value as set by the last call to
1809 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
1810 * @param toe reason for request termination (ignored)
1813 mhd_completed_cb (void *cls,
1814 struct MHD_Connection *connection,
1816 enum MHD_RequestTerminationCode toe)
1818 struct Socks5Request *s5r = *con_cls;
1819 struct HttpResponseHeader *header;
1823 if (MHD_REQUEST_TERMINATED_COMPLETED_OK != toe)
1824 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1825 "MHD encountered error handling request: %d\n",
1827 if (NULL != s5r->curl)
1829 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1830 "Resetting cURL handle\n");
1831 curl_multi_remove_handle (curl_multi, s5r->curl);
1832 curl_slist_free_all (s5r->headers);
1833 s5r->headers = NULL;
1834 curl_easy_reset (s5r->curl);
1839 if ( (NULL != s5r->response) &&
1840 (curl_failure_response != s5r->response) )
1841 MHD_destroy_response (s5r->response);
1842 for (header = s5r->header_head; header != NULL; header = s5r->header_head)
1844 GNUNET_CONTAINER_DLL_remove (s5r->header_head,
1847 GNUNET_free (header->type);
1848 GNUNET_free (header->value);
1849 GNUNET_free (header);
1851 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Finished request for %s\n", s5r->url);
1852 GNUNET_free (s5r->url);
1853 s5r->state = SOCKS5_SOCKET_WITH_MHD;
1855 s5r->response = NULL;
1861 * Function called when MHD connection is opened or closed.
1864 * @param connection connection handle
1865 * @param con_cls value as set by the last call to
1866 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
1867 * @param toe connection notification type
1870 mhd_connection_cb (void *cls,
1871 struct MHD_Connection *connection,
1873 enum MHD_ConnectionNotificationCode cnc)
1875 struct Socks5Request *s5r;
1876 const union MHD_ConnectionInfo *ci;
1881 case MHD_CONNECTION_NOTIFY_STARTED:
1882 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection started...\n");
1883 ci = MHD_get_connection_info (connection,
1884 MHD_CONNECTION_INFO_CONNECTION_FD);
1890 sock = ci->connect_fd;
1891 for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
1893 if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
1895 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Context set...\n");
1900 s5r->ssl_checked = GNUNET_NO;
1902 case MHD_CONNECTION_NOTIFY_CLOSED:
1903 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection closed... cleaning up\n");
1907 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Connection stale!\n");
1911 curl_download_prepare ();
1920 * Function called when MHD first processes an incoming connection.
1921 * Gives us the respective URI information.
1923 * We use this to associate the `struct MHD_Connection` with our
1924 * internal `struct Socks5Request` data structure (by checking
1925 * for matching sockets).
1927 * @param cls the HTTP server handle (a `struct MhdHttpList`)
1928 * @param url the URL that is being requested
1929 * @param connection MHD connection object for the request
1930 * @return the `struct Socks5Request` that this @a connection is for
1933 mhd_log_callback (void *cls,
1935 struct MHD_Connection *connection)
1937 struct Socks5Request *s5r;
1938 const union MHD_ConnectionInfo *ci;
1940 ci = MHD_get_connection_info (connection,
1941 MHD_CONNECTION_INFO_SOCKET_CONTEXT);
1942 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Processing %s\n", url);
1948 s5r = ci->socket_context;
1949 if (NULL != s5r->url)
1954 s5r->url = GNUNET_strdup (url);
1955 if (NULL != s5r->timeout_task)
1956 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
1957 s5r->timeout_task = NULL;
1958 GNUNET_assert (s5r->state == SOCKS5_SOCKET_WITH_MHD);
1964 * Kill the given MHD daemon.
1966 * @param hd daemon to stop
1969 kill_httpd (struct MhdHttpList *hd)
1971 GNUNET_CONTAINER_DLL_remove (mhd_httpd_head,
1974 GNUNET_free_non_null (hd->domain);
1975 MHD_stop_daemon (hd->daemon);
1976 if (NULL != hd->httpd_task)
1978 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1979 hd->httpd_task = NULL;
1981 GNUNET_free_non_null (hd->proxy_cert);
1989 * Task run whenever HTTP server is idle for too long. Kill it.
1991 * @param cls the `struct MhdHttpList *`
1994 kill_httpd_task (void *cls)
1996 struct MhdHttpList *hd = cls;
1998 hd->httpd_task = NULL;
2004 * Task run whenever HTTP server operations are pending.
2006 * @param cls the `struct MhdHttpList *` of the daemon that is being run
2009 do_httpd (void *cls);
2013 * Schedule MHD. This function should be called initially when an
2014 * MHD is first getting its client socket, and will then automatically
2015 * always be called later whenever there is work to be done.
2017 * @param hd the daemon to schedule
2020 schedule_httpd (struct MhdHttpList *hd)
2025 struct GNUNET_NETWORK_FDSet *wrs;
2026 struct GNUNET_NETWORK_FDSet *wws;
2029 MHD_UNSIGNED_LONG_LONG timeout;
2030 struct GNUNET_TIME_Relative tv;
2036 if (MHD_YES != MHD_get_fdset (hd->daemon, &rs, &ws, &es, &max))
2041 haveto = MHD_get_timeout (hd->daemon, &timeout);
2042 if (MHD_YES == haveto)
2043 tv.rel_value_us = (uint64_t) timeout * 1000LL;
2045 tv = GNUNET_TIME_UNIT_FOREVER_REL;
2048 wrs = GNUNET_NETWORK_fdset_create ();
2049 wws = GNUNET_NETWORK_fdset_create ();
2050 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
2051 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
2058 if (NULL != hd->httpd_task)
2059 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2060 if ( (MHD_YES != haveto) &&
2064 /* daemon is idle, kill after timeout */
2065 hd->httpd_task = GNUNET_SCHEDULER_add_delayed (MHD_CACHE_TIMEOUT,
2072 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2077 GNUNET_NETWORK_fdset_destroy (wrs);
2079 GNUNET_NETWORK_fdset_destroy (wws);
2084 * Task run whenever HTTP server operations are pending.
2086 * @param cls the `struct MhdHttpList` of the daemon that is being run
2089 do_httpd (void *cls)
2091 struct MhdHttpList *hd = cls;
2093 hd->httpd_task = NULL;
2094 MHD_run (hd->daemon);
2095 schedule_httpd (hd);
2100 * Run MHD now, we have extra data ready for the callback.
2102 * @param hd the daemon to run now.
2105 run_mhd_now (struct MhdHttpList *hd)
2109 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2110 hd->httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd,
2116 * Read file in filename
2118 * @param filename file to read
2119 * @param size pointer where filesize is stored
2120 * @return NULL on error
2123 load_file (const char* filename,
2130 GNUNET_DISK_file_size (filename, &fsize,
2131 GNUNET_YES, GNUNET_YES))
2133 if (fsize > MAX_PEM_SIZE)
2135 *size = (unsigned int) fsize;
2136 buffer = GNUNET_malloc (*size);
2137 if (fsize != GNUNET_DISK_fn_read (filename, buffer, (size_t) fsize))
2139 GNUNET_free (buffer);
2147 * Load PEM key from file
2149 * @param key where to store the data
2150 * @param keyfile path to the PEM file
2151 * @return #GNUNET_OK on success
2154 load_key_from_file (gnutls_x509_privkey_t key,
2155 const char* keyfile)
2157 gnutls_datum_t key_data;
2160 key_data.data = load_file (keyfile, &key_data.size);
2161 if (NULL == key_data.data)
2162 return GNUNET_SYSERR;
2163 ret = gnutls_x509_privkey_import (key, &key_data,
2164 GNUTLS_X509_FMT_PEM);
2165 if (GNUTLS_E_SUCCESS != ret)
2167 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2168 _("Unable to import private key from file `%s'\n"),
2171 GNUNET_free_non_null (key_data.data);
2172 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2177 * Load cert from file
2179 * @param crt struct to store data in
2180 * @param certfile path to pem file
2181 * @return #GNUNET_OK on success
2184 load_cert_from_file (gnutls_x509_crt_t crt,
2185 const char* certfile)
2187 gnutls_datum_t cert_data;
2190 cert_data.data = load_file (certfile, &cert_data.size);
2191 if (NULL == cert_data.data)
2192 return GNUNET_SYSERR;
2193 ret = gnutls_x509_crt_import (crt, &cert_data,
2194 GNUTLS_X509_FMT_PEM);
2195 if (GNUTLS_E_SUCCESS != ret)
2197 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2198 _("Unable to import certificate %s\n"), certfile);
2200 GNUNET_free_non_null (cert_data.data);
2201 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2206 * Generate new certificate for specific name
2208 * @param name the subject name to generate a cert for
2209 * @return a struct holding the PEM data, NULL on error
2211 static struct ProxyGNSCertificate *
2212 generate_gns_certificate (const char *name)
2214 unsigned int serial;
2215 size_t key_buf_size;
2216 size_t cert_buf_size;
2217 gnutls_x509_crt_t request;
2220 struct ProxyGNSCertificate *pgc;
2222 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2223 "Generating TLS/SSL certificate for `%s'\n",
2225 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_init (&request));
2226 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_key (request, proxy_ca.key));
2227 pgc = GNUNET_new (struct ProxyGNSCertificate);
2228 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COUNTRY_NAME,
2230 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_ORGANIZATION_NAME,
2231 0, "GNU Name System", 4);
2232 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COMMON_NAME,
2233 0, name, strlen (name));
2234 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_version (request, 3));
2235 gnutls_rnd (GNUTLS_RND_NONCE, &serial, sizeof (serial));
2236 gnutls_x509_crt_set_serial (request,
2239 etime = time (NULL);
2240 tm_data = localtime (&etime);
2241 gnutls_x509_crt_set_activation_time (request,
2244 etime = mktime (tm_data);
2245 gnutls_x509_crt_set_expiration_time (request,
2247 gnutls_x509_crt_sign (request,
2250 key_buf_size = sizeof (pgc->key);
2251 cert_buf_size = sizeof (pgc->cert);
2252 gnutls_x509_crt_export (request, GNUTLS_X509_FMT_PEM,
2253 pgc->cert, &cert_buf_size);
2254 gnutls_x509_privkey_export (proxy_ca.key, GNUTLS_X509_FMT_PEM,
2255 pgc->key, &key_buf_size);
2256 gnutls_x509_crt_deinit (request);
2262 * Function called by MHD with errors, suppresses them all.
2264 * @param cls closure
2265 * @param fm format string (`printf()`-style)
2266 * @param ap arguments to @a fm
2269 mhd_error_log_callback (void *cls,
2278 * Lookup (or create) an SSL MHD instance for a particular domain.
2280 * @param domain the domain the SSL daemon has to serve
2281 * @return NULL on error
2283 static struct MhdHttpList *
2284 lookup_ssl_httpd (const char* domain)
2286 struct MhdHttpList *hd;
2287 struct ProxyGNSCertificate *pgc;
2294 for (hd = mhd_httpd_head; NULL != hd; hd = hd->next)
2295 if ( (NULL != hd->domain) &&
2296 (0 == strcmp (hd->domain, domain)) )
2298 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2299 "Starting fresh MHD HTTPS instance for domain `%s'\n",
2301 pgc = generate_gns_certificate (domain);
2302 hd = GNUNET_new (struct MhdHttpList);
2303 hd->is_ssl = GNUNET_YES;
2304 hd->domain = GNUNET_strdup (domain);
2305 hd->proxy_cert = pgc;
2306 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_SSL | MHD_USE_NO_LISTEN_SOCKET,
2309 &create_response, hd,
2310 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
2311 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
2312 MHD_OPTION_NOTIFY_CONNECTION, &mhd_connection_cb, NULL,
2313 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
2314 MHD_OPTION_EXTERNAL_LOGGER, &mhd_error_log_callback, NULL,
2315 MHD_OPTION_HTTPS_MEM_KEY, pgc->key,
2316 MHD_OPTION_HTTPS_MEM_CERT, pgc->cert,
2318 if (NULL == hd->daemon)
2324 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
2332 * Task run when a Socks5Request somehow fails to be associated with
2333 * an MHD connection (i.e. because the client never speaks HTTP after
2334 * the SOCKS5 handshake). Clean up.
2336 * @param cls the `struct Socks5Request *`
2339 timeout_s5r_handshake (void *cls)
2341 struct Socks5Request *s5r = cls;
2343 s5r->timeout_task = NULL;
2349 * We're done with the Socks5 protocol, now we need to pass the
2350 * connection data through to the final destination, either
2351 * direct (if the protocol might not be HTTP), or via MHD
2352 * (if the port looks like it should be HTTP).
2354 * @param s5r socks request that has reached the final stage
2357 setup_data_transfer (struct Socks5Request *s5r)
2359 struct MhdHttpList *hd;
2361 const struct sockaddr *addr;
2367 hd = lookup_ssl_httpd (s5r->domain);
2370 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2371 _("Failed to start HTTPS server for `%s'\n"),
2379 GNUNET_assert (NULL != httpd);
2383 fd = GNUNET_NETWORK_get_fd (s5r->sock);
2384 addr = GNUNET_NETWORK_get_addr (s5r->sock);
2385 len = GNUNET_NETWORK_get_addrlen (s5r->sock);
2386 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2387 if (MHD_YES != MHD_add_connection (hd->daemon, fd, addr, len))
2389 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2390 _("Failed to pass client to MHD\n"));
2395 schedule_httpd (hd);
2396 s5r->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_HANDSHAKE_TIMEOUT,
2397 &timeout_s5r_handshake,
2402 /* ********************* SOCKS handling ************************* */
2406 * Write data from buffer to socks5 client, then continue with state machine.
2408 * @param cls the closure with the `struct Socks5Request`
2411 do_write (void *cls)
2413 struct Socks5Request *s5r = cls;
2417 len = GNUNET_NETWORK_socket_send (s5r->sock,
2422 /* write error: connection closed, shutdown, etc.; just clean up */
2428 s5r->wbuf_len - len);
2429 s5r->wbuf_len -= len;
2430 if (s5r->wbuf_len > 0)
2432 /* not done writing */
2434 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2440 /* we're done writing, continue with state machine! */
2447 case SOCKS5_REQUEST:
2448 GNUNET_assert (NULL != s5r->rtask);
2450 case SOCKS5_DATA_TRANSFER:
2451 setup_data_transfer (s5r);
2453 case SOCKS5_WRITE_THEN_CLEANUP:
2464 * Return a server response message indicating a failure to the client.
2466 * @param s5r request to return failure code for
2467 * @param sc status code to return
2470 signal_socks_failure (struct Socks5Request *s5r,
2471 enum Socks5StatusCode sc)
2473 struct Socks5ServerResponseMessage *s_resp;
2475 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2476 memset (s_resp, 0, sizeof (struct Socks5ServerResponseMessage));
2477 s_resp->version = SOCKS_VERSION_5;
2479 s5r->state = SOCKS5_WRITE_THEN_CLEANUP;
2480 if (NULL != s5r->wtask)
2482 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2489 * Return a server response message indicating success.
2491 * @param s5r request to return success status message for
2494 signal_socks_success (struct Socks5Request *s5r)
2496 struct Socks5ServerResponseMessage *s_resp;
2498 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2499 s_resp->version = SOCKS_VERSION_5;
2500 s_resp->reply = SOCKS5_STATUS_REQUEST_GRANTED;
2501 s_resp->reserved = 0;
2502 s_resp->addr_type = SOCKS5_AT_IPV4;
2503 /* zero out IPv4 address and port */
2506 sizeof (struct in_addr) + sizeof (uint16_t));
2507 s5r->wbuf_len += sizeof (struct Socks5ServerResponseMessage) +
2508 sizeof (struct in_addr) + sizeof (uint16_t);
2509 if (NULL == s5r->wtask)
2511 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2518 * Process GNS results for target domain.
2520 * @param cls the `struct Socks5Request *`
2521 * @param rd_count number of records returned
2522 * @param rd record data
2525 handle_gns_result (void *cls,
2527 const struct GNUNET_GNSRECORD_Data *rd)
2529 struct Socks5Request *s5r = cls;
2531 const struct GNUNET_GNSRECORD_Data *r;
2534 s5r->gns_lookup = NULL;
2536 for (i=0;i<rd_count;i++)
2539 switch (r->record_type)
2541 case GNUNET_DNSPARSER_TYPE_A:
2543 struct sockaddr_in *in;
2545 if (sizeof (struct in_addr) != r->data_size)
2547 GNUNET_break_op (0);
2550 if (GNUNET_YES == got_ip)
2553 GNUNET_NETWORK_test_pf (PF_INET))
2555 got_ip = GNUNET_YES;
2556 in = (struct sockaddr_in *) &s5r->destination_address;
2557 in->sin_family = AF_INET;
2558 GNUNET_memcpy (&in->sin_addr,
2561 in->sin_port = htons (s5r->port);
2562 #if HAVE_SOCKADDR_IN_SIN_LEN
2563 in->sin_len = sizeof (*in);
2567 case GNUNET_DNSPARSER_TYPE_AAAA:
2569 struct sockaddr_in6 *in;
2571 if (sizeof (struct in6_addr) != r->data_size)
2573 GNUNET_break_op (0);
2576 if (GNUNET_YES == got_ip)
2579 GNUNET_NETWORK_test_pf (PF_INET))
2581 /* FIXME: allow user to disable IPv6 per configuration option... */
2582 got_ip = GNUNET_YES;
2583 in = (struct sockaddr_in6 *) &s5r->destination_address;
2584 in->sin6_family = AF_INET6;
2585 GNUNET_memcpy (&in->sin6_addr,
2588 in->sin6_port = htons (s5r->port);
2589 #if HAVE_SOCKADDR_IN_SIN_LEN
2590 in->sin6_len = sizeof (*in);
2594 case GNUNET_GNSRECORD_TYPE_VPN:
2595 GNUNET_break (0); /* should have been translated within GNS */
2597 case GNUNET_GNSRECORD_TYPE_LEHO:
2598 GNUNET_free_non_null (s5r->leho);
2599 s5r->leho = GNUNET_strndup (r->data,
2602 case GNUNET_GNSRECORD_TYPE_BOX:
2604 const struct GNUNET_GNSRECORD_BoxRecord *box;
2606 if (r->data_size < sizeof (struct GNUNET_GNSRECORD_BoxRecord))
2608 GNUNET_break_op (0);
2612 if ( (ntohl (box->record_type) != GNUNET_DNSPARSER_TYPE_TLSA) ||
2613 (ntohs (box->protocol) != IPPROTO_TCP) ||
2614 (ntohs (box->service) != s5r->port) )
2615 break; /* BOX record does not apply */
2616 GNUNET_free_non_null (s5r->dane_data);
2617 s5r->dane_data_len = r->data_size - sizeof (struct GNUNET_GNSRECORD_BoxRecord);
2618 s5r->dane_data = GNUNET_malloc (s5r->dane_data_len);
2619 GNUNET_memcpy (s5r->dane_data,
2621 s5r->dane_data_len);
2629 if (GNUNET_YES != got_ip)
2631 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2632 "Name resolution failed to yield useful IP address.\n");
2633 signal_socks_failure (s5r,
2634 SOCKS5_STATUS_GENERAL_FAILURE);
2637 s5r->state = SOCKS5_DATA_TRANSFER;
2638 signal_socks_success (s5r);
2643 * Remove the first @a len bytes from the beginning of the read buffer.
2645 * @param s5r the handle clear the read buffer for
2646 * @param len number of bytes in read buffer to advance
2649 clear_from_s5r_rbuf (struct Socks5Request *s5r,
2652 GNUNET_assert (len <= s5r->rbuf_len);
2655 s5r->rbuf_len - len);
2656 s5r->rbuf_len -= len;
2661 * Read data from incoming Socks5 connection
2663 * @param cls the closure with the `struct Socks5Request`
2666 do_s5r_read (void *cls)
2668 struct Socks5Request *s5r = cls;
2669 const struct Socks5ClientHelloMessage *c_hello;
2670 struct Socks5ServerHelloMessage *s_hello;
2671 const struct Socks5ClientRequestMessage *c_req;
2674 const struct GNUNET_SCHEDULER_TaskContext *tc;
2677 tc = GNUNET_SCHEDULER_get_task_context ();
2678 if ( (NULL != tc->read_ready) &&
2679 (GNUNET_NETWORK_fdset_isset (tc->read_ready, s5r->sock)) )
2681 rlen = GNUNET_NETWORK_socket_recv (s5r->sock,
2682 &s5r->rbuf[s5r->rbuf_len],
2683 sizeof (s5r->rbuf) - s5r->rbuf_len);
2686 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2687 "socks5 client disconnected.\n");
2691 s5r->rbuf_len += rlen;
2693 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2696 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2697 "Processing %zu bytes of socks data in state %d\n",
2703 c_hello = (const struct Socks5ClientHelloMessage*) &s5r->rbuf;
2704 if ( (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage)) ||
2705 (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods) )
2706 return; /* need more data */
2707 if (SOCKS_VERSION_5 != c_hello->version)
2709 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2710 _("Unsupported socks version %d\n"),
2711 (int) c_hello->version);
2715 clear_from_s5r_rbuf (s5r,
2716 sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods);
2717 GNUNET_assert (0 == s5r->wbuf_len);
2718 s_hello = (struct Socks5ServerHelloMessage *) &s5r->wbuf;
2719 s5r->wbuf_len = sizeof (struct Socks5ServerHelloMessage);
2720 s_hello->version = SOCKS_VERSION_5;
2721 s_hello->auth_method = SOCKS_AUTH_NONE;
2722 GNUNET_assert (NULL == s5r->wtask);
2723 s5r->wtask = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2726 s5r->state = SOCKS5_REQUEST;
2728 case SOCKS5_REQUEST:
2729 c_req = (const struct Socks5ClientRequestMessage *) &s5r->rbuf;
2730 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage))
2732 switch (c_req->command)
2734 case SOCKS5_CMD_TCP_STREAM:
2738 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2739 _("Unsupported socks command %d\n"),
2740 (int) c_req->command);
2741 signal_socks_failure (s5r,
2742 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED);
2745 switch (c_req->addr_type)
2747 case SOCKS5_AT_IPV4:
2749 const struct in_addr *v4 = (const struct in_addr *) &c_req[1];
2750 const uint16_t *port = (const uint16_t *) &v4[1];
2751 struct sockaddr_in *in;
2753 s5r->port = ntohs (*port);
2754 if (HTTPS_PORT == s5r->port)
2756 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2757 _("SSL connection to plain IPv4 address requested\n"));
2758 signal_socks_failure (s5r,
2759 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE);
2762 alen = sizeof (struct in_addr);
2763 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2764 alen + sizeof (uint16_t))
2765 return; /* need more data */
2766 in = (struct sockaddr_in *) &s5r->destination_address;
2767 in->sin_family = AF_INET;
2769 in->sin_port = *port;
2770 #if HAVE_SOCKADDR_IN_SIN_LEN
2771 in->sin_len = sizeof (*in);
2773 s5r->state = SOCKS5_DATA_TRANSFER;
2776 case SOCKS5_AT_IPV6:
2778 const struct in6_addr *v6 = (const struct in6_addr *) &c_req[1];
2779 const uint16_t *port = (const uint16_t *) &v6[1];
2780 struct sockaddr_in6 *in;
2782 s5r->port = ntohs (*port);
2783 if (HTTPS_PORT == s5r->port)
2785 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2786 _("SSL connection to plain IPv4 address requested\n"));
2787 signal_socks_failure (s5r,
2788 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE);
2791 alen = sizeof (struct in6_addr);
2792 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2793 alen + sizeof (uint16_t))
2794 return; /* need more data */
2795 in = (struct sockaddr_in6 *) &s5r->destination_address;
2796 in->sin6_family = AF_INET6;
2797 in->sin6_addr = *v6;
2798 in->sin6_port = *port;
2799 #if HAVE_SOCKADDR_IN_SIN_LEN
2800 in->sin6_len = sizeof (*in);
2802 s5r->state = SOCKS5_DATA_TRANSFER;
2805 case SOCKS5_AT_DOMAINNAME:
2807 const uint8_t *dom_len;
2808 const char *dom_name;
2809 const uint16_t *port;
2811 dom_len = (const uint8_t *) &c_req[1];
2812 alen = *dom_len + 1;
2813 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2814 alen + sizeof (uint16_t))
2815 return; /* need more data */
2816 dom_name = (const char *) &dom_len[1];
2817 port = (const uint16_t*) &dom_name[*dom_len];
2818 s5r->domain = GNUNET_strndup (dom_name, *dom_len);
2819 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2820 "Requested connection is to %s:%d\n",
2823 s5r->state = SOCKS5_RESOLVING;
2824 s5r->port = ntohs (*port);
2825 s5r->gns_lookup = GNUNET_GNS_lookup (gns_handle,
2828 GNUNET_DNSPARSER_TYPE_A,
2829 GNUNET_NO /* only cached */,
2830 (GNUNET_YES == do_shorten) ? &local_shorten_zone : NULL,
2836 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2837 _("Unsupported socks address type %d\n"),
2838 (int) c_req->addr_type);
2839 signal_socks_failure (s5r,
2840 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED);
2843 clear_from_s5r_rbuf (s5r,
2844 sizeof (struct Socks5ClientRequestMessage) +
2845 alen + sizeof (uint16_t));
2846 if (0 != s5r->rbuf_len)
2848 /* read more bytes than healthy, why did the client send more!? */
2849 GNUNET_break_op (0);
2850 signal_socks_failure (s5r,
2851 SOCKS5_STATUS_GENERAL_FAILURE);
2854 if (SOCKS5_DATA_TRANSFER == s5r->state)
2856 /* if we are not waiting for GNS resolution, signal success */
2857 signal_socks_success (s5r);
2859 /* We are done reading right now */
2860 GNUNET_SCHEDULER_cancel (s5r->rtask);
2863 case SOCKS5_RESOLVING:
2866 case SOCKS5_DATA_TRANSFER:
2877 * Accept new incoming connections
2879 * @param cls the closure with the lsock4 or lsock6
2880 * @param tc the scheduler context
2883 do_accept (void *cls)
2885 struct GNUNET_NETWORK_Handle *lsock = cls;
2886 struct GNUNET_NETWORK_Handle *s;
2887 struct Socks5Request *s5r;
2889 if (lsock == lsock4)
2893 if (lsock == lsock4)
2894 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2898 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2901 s = GNUNET_NETWORK_socket_accept (lsock, NULL, NULL);
2904 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "accept");
2907 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2908 "Got an inbound connection, waiting for data\n");
2909 s5r = GNUNET_new (struct Socks5Request);
2910 GNUNET_CONTAINER_DLL_insert (s5r_head,
2914 s5r->state = SOCKS5_INIT;
2915 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2921 /* ******************* General / main code ********************* */
2925 * Task run on shutdown
2927 * @param cls closure
2930 do_shutdown (void *cls)
2932 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2933 "Shutting down...\n");
2934 while (NULL != mhd_httpd_head)
2935 kill_httpd (mhd_httpd_head);
2936 while (NULL != s5r_head)
2937 cleanup_s5r (s5r_head);
2940 GNUNET_NETWORK_socket_close (lsock4);
2945 GNUNET_NETWORK_socket_close (lsock6);
2950 GNUNET_IDENTITY_cancel (id_op);
2953 if (NULL != identity)
2955 GNUNET_IDENTITY_disconnect (identity);
2958 if (NULL != curl_multi)
2960 curl_multi_cleanup (curl_multi);
2963 if (NULL != gns_handle)
2965 GNUNET_GNS_disconnect (gns_handle);
2968 if (NULL != curl_download_task)
2970 GNUNET_SCHEDULER_cancel (curl_download_task);
2971 curl_download_task = NULL;
2975 GNUNET_SCHEDULER_cancel (ltask4);
2980 GNUNET_SCHEDULER_cancel (ltask6);
2983 gnutls_x509_crt_deinit (proxy_ca.cert);
2984 gnutls_x509_privkey_deinit (proxy_ca.key);
2985 gnutls_global_deinit ();
2990 * Create an IPv4 listen socket bound to our port.
2992 * @return NULL on error
2994 static struct GNUNET_NETWORK_Handle *
2997 struct GNUNET_NETWORK_Handle *ls;
2998 struct sockaddr_in sa4;
3001 memset (&sa4, 0, sizeof (sa4));
3002 sa4.sin_family = AF_INET;
3003 sa4.sin_port = htons (port);
3004 #if HAVE_SOCKADDR_IN_SIN_LEN
3005 sa4.sin_len = sizeof (sa4);
3007 ls = GNUNET_NETWORK_socket_create (AF_INET,
3013 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa4,
3017 GNUNET_NETWORK_socket_close (ls);
3026 * Create an IPv6 listen socket bound to our port.
3028 * @return NULL on error
3030 static struct GNUNET_NETWORK_Handle *
3033 struct GNUNET_NETWORK_Handle *ls;
3034 struct sockaddr_in6 sa6;
3037 memset (&sa6, 0, sizeof (sa6));
3038 sa6.sin6_family = AF_INET6;
3039 sa6.sin6_port = htons (port);
3040 #if HAVE_SOCKADDR_IN_SIN_LEN
3041 sa6.sin6_len = sizeof (sa6);
3043 ls = GNUNET_NETWORK_socket_create (AF_INET6,
3049 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa6,
3053 GNUNET_NETWORK_socket_close (ls);
3062 * Continue initialization after we have our zone information.
3067 struct MhdHttpList *hd;
3069 /* Open listen socket for socks proxy */
3070 lsock6 = bind_v6 ();
3072 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
3075 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock6, 5))
3077 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
3078 GNUNET_NETWORK_socket_close (lsock6);
3083 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3084 lsock6, &do_accept, lsock6);
3087 lsock4 = bind_v4 ();
3089 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
3092 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock4, 5))
3094 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
3095 GNUNET_NETWORK_socket_close (lsock4);
3100 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3101 lsock4, &do_accept, lsock4);
3104 if ( (NULL == lsock4) &&
3107 GNUNET_SCHEDULER_shutdown ();
3110 if (0 != curl_global_init (CURL_GLOBAL_WIN32))
3112 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3113 "cURL global init failed!\n");
3114 GNUNET_SCHEDULER_shutdown ();
3117 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3118 "Proxy listens on port %lu\n",
3121 /* start MHD daemon for HTTP */
3122 hd = GNUNET_new (struct MhdHttpList);
3123 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_NO_LISTEN_SOCKET,
3126 &create_response, hd,
3127 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
3128 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
3129 MHD_OPTION_NOTIFY_CONNECTION, &mhd_connection_cb, NULL,
3130 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
3132 if (NULL == hd->daemon)
3135 GNUNET_SCHEDULER_shutdown ();
3139 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head, mhd_httpd_tail, hd);
3144 * Method called to inform about the egos of the shorten zone of this peer.
3146 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
3147 * this function is only called ONCE, and 'NULL' being passed in
3148 * @a ego does indicate an error (i.e. name is taken or no default
3149 * value is known). If @a ego is non-NULL and if '*ctx'
3150 * is set in those callbacks, the value WILL be passed to a subsequent
3151 * call to the identity callback of #GNUNET_IDENTITY_connect (if
3152 * that one was not NULL).
3154 * @param cls closure, NULL
3155 * @param ego ego handle
3156 * @param ctx context for application to store data for this ego
3157 * (during the lifetime of this process, initially NULL)
3158 * @param name name assigned by the user for this ego,
3159 * NULL if the user just deleted the ego and it
3160 * must thus no longer be used
3163 identity_shorten_cb (void *cls,
3164 struct GNUNET_IDENTITY_Ego *ego,
3171 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3172 _("No ego configured for `shorten-zone`\n"));
3176 local_shorten_zone = *GNUNET_IDENTITY_ego_get_private_key (ego);
3177 do_shorten = GNUNET_YES;
3184 * Method called to inform about the egos of the master zone of this peer.
3186 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
3187 * this function is only called ONCE, and 'NULL' being passed in
3188 * @a ego does indicate an error (i.e. name is taken or no default
3189 * value is known). If @a ego is non-NULL and if '*ctx'
3190 * is set in those callbacks, the value WILL be passed to a subsequent
3191 * call to the identity callback of #GNUNET_IDENTITY_connect (if
3192 * that one was not NULL).
3194 * @param cls closure, NULL
3195 * @param ego ego handle
3196 * @param ctx context for application to store data for this ego
3197 * (during the lifetime of this process, initially NULL)
3198 * @param name name assigned by the user for this ego,
3199 * NULL if the user just deleted the ego and it
3200 * must thus no longer be used
3203 identity_master_cb (void *cls,
3204 struct GNUNET_IDENTITY_Ego *ego,
3211 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3212 _("No ego configured for `%s`\n"),
3214 GNUNET_SCHEDULER_shutdown ();
3217 GNUNET_IDENTITY_ego_get_public_key (ego,
3219 id_op = GNUNET_IDENTITY_get (identity,
3221 &identity_shorten_cb,
3227 * Main function that will be run
3229 * @param cls closure
3230 * @param args remaining command-line arguments
3231 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
3232 * @param c configuration
3235 run (void *cls, char *const *args, const char *cfgfile,
3236 const struct GNUNET_CONFIGURATION_Handle *c)
3238 char* cafile_cfg = NULL;
3243 if (NULL == (curl_multi = curl_multi_init ()))
3245 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3246 "Failed to create cURL multi handle!\n");
3249 cafile = cafile_opt;
3252 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "gns-proxy",
3256 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
3261 cafile = cafile_cfg;
3263 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3264 "Using %s as CA\n", cafile);
3266 gnutls_global_init ();
3267 gnutls_x509_crt_init (&proxy_ca.cert);
3268 gnutls_x509_privkey_init (&proxy_ca.key);
3270 if ( (GNUNET_OK != load_cert_from_file (proxy_ca.cert, cafile)) ||
3271 (GNUNET_OK != load_key_from_file (proxy_ca.key, cafile)) )
3273 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3274 _("Failed to load SSL/TLS key and certificate from `%s'\n"),
3276 gnutls_x509_crt_deinit (proxy_ca.cert);
3277 gnutls_x509_privkey_deinit (proxy_ca.key);
3278 gnutls_global_deinit ();
3279 GNUNET_free_non_null (cafile_cfg);
3282 GNUNET_free_non_null (cafile_cfg);
3283 if (NULL == (gns_handle = GNUNET_GNS_connect (cfg)))
3285 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3286 "Unable to connect to GNS!\n");
3287 gnutls_x509_crt_deinit (proxy_ca.cert);
3288 gnutls_x509_privkey_deinit (proxy_ca.key);
3289 gnutls_global_deinit ();
3292 identity = GNUNET_IDENTITY_connect (cfg,
3294 id_op = GNUNET_IDENTITY_get (identity,
3296 &identity_master_cb,
3298 GNUNET_SCHEDULER_add_shutdown (&do_shutdown, NULL);
3303 * The main function for gnunet-gns-proxy.
3305 * @param argc number of arguments from the command line
3306 * @param argv command line arguments
3307 * @return 0 ok, 1 on error
3310 main (int argc, char *const *argv)
3312 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
3314 gettext_noop ("listen on specified port (default: 7777)"), 1,
3315 &GNUNET_GETOPT_set_ulong, &port},
3316 {'a', "authority", NULL,
3317 gettext_noop ("pem file to use as CA"), 1,
3318 &GNUNET_GETOPT_set_string, &cafile_opt},
3319 GNUNET_GETOPT_OPTION_END
3321 static const char* page =
3322 "<html><head><title>gnunet-gns-proxy</title>"
3323 "</head><body>cURL fail</body></html>";
3326 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
3328 GNUNET_log_setup ("gnunet-gns-proxy", "WARNING", NULL);
3329 curl_failure_response = MHD_create_response_from_buffer (strlen (page),
3331 MHD_RESPMEM_PERSISTENT);
3335 GNUNET_PROGRAM_run (argc, argv, "gnunet-gns-proxy",
3336 _("GNUnet GNS proxy"),
3338 &run, NULL)) ? 0 : 1;
3339 MHD_destroy_response (curl_failure_response);
3340 GNUNET_free_non_null ((char *) argv);
3341 GNUNET_CRYPTO_ecdsa_key_clear (&local_shorten_zone);
3345 /* end of gnunet-gns-proxy.c */