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 * Handle to Ego lookup, during #SOCKS5_RESOLVING phase.
488 struct GNUNET_IDENTITY_EgoLookup *el;
491 * Client socket read task
493 struct GNUNET_SCHEDULER_Task * rtask;
496 * Client socket write task
498 struct GNUNET_SCHEDULER_Task * wtask;
503 struct GNUNET_SCHEDULER_Task * timeout_task;
508 char rbuf[SOCKS_BUFFERSIZE];
513 char wbuf[SOCKS_BUFFERSIZE];
516 * Buffer we use for moving data between MHD and curl (in both directions).
518 char io_buf[IO_BUFFERSIZE];
521 * MHD HTTP instance handling this request, NULL for none.
523 struct MhdHttpList *hd;
526 * MHD response object for this request.
528 struct MHD_Response *response;
531 * the domain name to server (only important for SSL)
541 * DNS Legacy Host Name as given by GNS, NULL if not given.
546 * Payload of the (last) DANE record encountered.
561 * HTTP request headers for the curl request.
563 struct curl_slist *headers;
566 * DNS->IP mappings resolved through GNS
568 struct curl_slist *hosts;
571 * HTTP response code to give to MHD for the response.
573 unsigned int response_code;
576 * Number of bytes in @e dane_data.
578 size_t dane_data_len;
581 * Number of bytes already in read buffer
586 * Number of bytes already in write buffer
591 * Number of bytes already in the IO buffer.
596 * Once known, what's the target address for the connection?
598 struct sockaddr_storage destination_address;
603 enum SocksPhase state;
606 * Desired destination port.
611 * Headers from response
613 struct HttpResponseHeader *header_head;
616 * Headers from response
618 struct HttpResponseHeader *header_tail;
621 * SSL Certificate status
628 /* *********************** Globals **************************** */
632 * The port the proxy is running on (default 7777)
634 static unsigned long long port = GNUNET_GNS_PROXY_PORT;
637 * The CA file (pem) to use for the proxy CA
639 static char *cafile_opt;
642 * The listen socket of the proxy for IPv4
644 static struct GNUNET_NETWORK_Handle *lsock4;
647 * The listen socket of the proxy for IPv6
649 static struct GNUNET_NETWORK_Handle *lsock6;
652 * The listen task ID for IPv4
654 static struct GNUNET_SCHEDULER_Task * ltask4;
657 * The listen task ID for IPv6
659 static struct GNUNET_SCHEDULER_Task * ltask6;
662 * The cURL download task (curl multi API).
664 static struct GNUNET_SCHEDULER_Task * curl_download_task;
667 * The cURL multi handle
669 static CURLM *curl_multi;
672 * Handle to the GNS service
674 static struct GNUNET_GNS_Handle *gns_handle;
677 * DLL for http/https daemons
679 static struct MhdHttpList *mhd_httpd_head;
682 * DLL for http/https daemons
684 static struct MhdHttpList *mhd_httpd_tail;
687 * Daemon for HTTP (we have one per SSL certificate, and then one for
688 * all HTTP connections; this is the one for HTTP, not HTTPS).
690 static struct MhdHttpList *httpd;
693 * DLL of active socks requests.
695 static struct Socks5Request *s5r_head;
698 * DLL of active socks requests.
700 static struct Socks5Request *s5r_tail;
703 * The users local GNS master zone
705 static struct GNUNET_CRYPTO_EcdsaPublicKey local_gns_zone;
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 *********************** */
800 curl_download_prepare ();
803 * Callback for MHD response generation. This function is called from
804 * MHD whenever MHD expects to get data back. Copies data from the
805 * io_buf, if available.
807 * @param cls closure with our `struct Socks5Request`
808 * @param pos in buffer
809 * @param buf where to copy data
810 * @param max available space in @a buf
811 * @return number of bytes written to @a buf
814 mhd_content_cb (void *cls,
819 struct Socks5Request *s5r = cls;
820 size_t bytes_to_copy;
822 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
823 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
825 /* we're still not done with the upload, do not yet
826 start the download, the IO buffer is still full
828 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
829 "Pausing MHD download, not yet ready for download\n");
830 return 0; /* not yet ready for data download */
832 bytes_to_copy = GNUNET_MIN (max,
834 if ( (0 == bytes_to_copy) &&
835 (SOCKS5_SOCKET_DOWNLOAD_DONE != s5r->state) )
837 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
838 "Pausing MHD download, no data available\n");
839 if (NULL != s5r->curl)
841 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
842 curl_download_prepare ();
844 return 0; /* more data later */
846 if ( (0 == bytes_to_copy) &&
847 (SOCKS5_SOCKET_DOWNLOAD_DONE == s5r->state) )
849 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
850 "Completed MHD download\n");
851 return MHD_CONTENT_READER_END_OF_STREAM;
853 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
854 "Writing %lu/%lu bytes\n", bytes_to_copy, s5r->io_len);
855 GNUNET_memcpy (buf, s5r->io_buf, bytes_to_copy);
856 memmove (s5r->io_buf,
857 &s5r->io_buf[bytes_to_copy],
858 s5r->io_len - bytes_to_copy);
859 s5r->io_len -= bytes_to_copy;
860 if (NULL != s5r->curl)
861 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
862 return bytes_to_copy;
867 * Check that the website has presented us with a valid SSL certificate.
868 * The certificate must either match the domain name or the LEHO name
869 * (or, if available, the TLSA record).
871 * @param s5r request to check for.
872 * @return #GNUNET_OK if the certificate is valid
875 check_ssl_certificate (struct Socks5Request *s5r)
877 unsigned int cert_list_size;
878 const gnutls_datum_t *chainp;
879 const struct curl_tlssessioninfo *tlsinfo;
880 char certdn[GNUNET_DNSPARSER_MAX_NAME_LENGTH + 3];
882 gnutls_x509_crt_t x509_cert;
886 s5r->ssl_checked = GNUNET_YES;
887 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
888 "Checking SSL certificate\n");
890 curl_easy_getinfo (s5r->curl,
891 CURLINFO_TLS_SESSION,
892 (struct curl_slist **) &tlsinfo))
893 return GNUNET_SYSERR;
894 if (CURLSSLBACKEND_GNUTLS != tlsinfo->backend)
896 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
897 _("Unsupported CURL SSL backend %d\n"),
899 return GNUNET_SYSERR;
901 chainp = gnutls_certificate_get_peers (tlsinfo->internals, &cert_list_size);
902 if ( (! chainp) || (0 == cert_list_size) )
903 return GNUNET_SYSERR;
905 size = sizeof (certdn);
906 /* initialize an X.509 certificate structure. */
907 gnutls_x509_crt_init (&x509_cert);
908 gnutls_x509_crt_import (x509_cert,
910 GNUTLS_X509_FMT_DER);
912 if (0 != (rc = gnutls_x509_crt_get_dn_by_oid (x509_cert,
913 GNUTLS_OID_X520_COMMON_NAME,
914 0, /* the first and only one */
915 0 /* no DER encoding */,
919 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
920 _("Failed to fetch CN from cert: %s\n"),
921 gnutls_strerror(rc));
922 gnutls_x509_crt_deinit (x509_cert);
923 return GNUNET_SYSERR;
925 /* check for TLSA/DANE records */
927 if (NULL != s5r->dane_data)
929 char *dd[] = { s5r->dane_data, NULL };
930 int dlen[] = { s5r->dane_data_len, 0};
931 dane_state_t dane_state;
932 dane_query_t dane_query;
935 /* FIXME: add flags to gnutls to NOT read UNBOUND_ROOT_KEY_FILE here! */
936 if (0 != (rc = dane_state_init (&dane_state,
937 #ifdef DANE_F_IGNORE_DNSSEC
938 DANE_F_IGNORE_DNSSEC |
940 DANE_F_IGNORE_LOCAL_RESOLVER)))
942 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
943 _("Failed to initialize DANE: %s\n"),
945 gnutls_x509_crt_deinit (x509_cert);
946 return GNUNET_SYSERR;
948 if (0 != (rc = dane_raw_tlsa (dane_state,
955 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
956 _("Failed to parse DANE record: %s\n"),
958 dane_state_deinit (dane_state);
959 gnutls_x509_crt_deinit (x509_cert);
960 return GNUNET_SYSERR;
962 if (0 != (rc = dane_verify_crt_raw (dane_state,
965 gnutls_certificate_type_get (tlsinfo->internals),
970 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
971 _("Failed to verify TLS connection using DANE: %s\n"),
973 dane_query_deinit (dane_query);
974 dane_state_deinit (dane_state);
975 gnutls_x509_crt_deinit (x509_cert);
976 return GNUNET_SYSERR;
980 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
981 _("Failed DANE verification failed with GnuTLS verify status code: %u\n"),
983 dane_query_deinit (dane_query);
984 dane_state_deinit (dane_state);
985 gnutls_x509_crt_deinit (x509_cert);
986 return GNUNET_SYSERR;
988 dane_query_deinit (dane_query);
989 dane_state_deinit (dane_state);
995 /* try LEHO or ordinary domain name X509 verification */
997 if (NULL != s5r->leho)
1001 if (0 == (rc = gnutls_x509_crt_check_hostname (x509_cert,
1004 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1005 _("SSL certificate subject name (%s) does not match `%s'\n"),
1008 gnutls_x509_crt_deinit (x509_cert);
1009 return GNUNET_SYSERR;
1014 /* we did not even have the domain name!? */
1016 return GNUNET_SYSERR;
1019 gnutls_x509_crt_deinit (x509_cert);
1025 * We're getting an HTTP response header from cURL. Convert it to the
1026 * MHD response headers. Mostly copies the headers, but makes special
1027 * adjustments to "Set-Cookie" and "Location" headers as those may need
1028 * to be changed from the LEHO to the domain the browser expects.
1030 * @param buffer curl buffer with a single line of header data; not 0-terminated!
1031 * @param size curl blocksize
1032 * @param nmemb curl blocknumber
1033 * @param cls our `struct Socks5Request *`
1034 * @return size of processed bytes
1037 curl_check_hdr (void *buffer, size_t size, size_t nmemb, void *cls)
1039 struct Socks5Request *s5r = cls;
1040 struct HttpResponseHeader *header;
1041 size_t bytes = size * nmemb;
1043 const char *hdr_type;
1044 const char *cookie_domain;
1046 char *new_cookie_hdr;
1049 size_t delta_cdomain;
1053 /* first, check SSL certificate */
1054 if ((GNUNET_YES != s5r->ssl_checked) &&
1055 (HTTPS_PORT == s5r->port))
1057 if (GNUNET_OK != check_ssl_certificate (s5r))
1061 ndup = GNUNET_strndup (buffer, bytes);
1062 hdr_type = strtok (ndup, ":");
1063 if (NULL == hdr_type)
1068 hdr_val = strtok (NULL, "");
1069 if (NULL == hdr_val)
1074 if (' ' == *hdr_val)
1077 /* custom logic for certain header types */
1078 new_cookie_hdr = NULL;
1079 if ( (NULL != s5r->leho) &&
1080 (0 == strcasecmp (hdr_type,
1081 MHD_HTTP_HEADER_SET_COOKIE)) )
1084 new_cookie_hdr = GNUNET_malloc (strlen (hdr_val) +
1085 strlen (s5r->domain) + 1);
1087 domain_matched = GNUNET_NO; /* make sure we match domain at most once */
1088 for (tok = strtok (hdr_val, ";"); NULL != tok; tok = strtok (NULL, ";"))
1090 if ( (0 == strncasecmp (tok, " domain", strlen (" domain"))) &&
1091 (GNUNET_NO == domain_matched) )
1093 domain_matched = GNUNET_YES;
1094 cookie_domain = tok + strlen (" domain") + 1;
1095 if (strlen (cookie_domain) < strlen (s5r->leho))
1097 delta_cdomain = strlen (s5r->leho) - strlen (cookie_domain);
1098 if (0 == strcasecmp (cookie_domain, s5r->leho + delta_cdomain))
1100 offset += sprintf (new_cookie_hdr + offset,
1107 else if (0 == strcmp (cookie_domain, s5r->leho))
1109 offset += sprintf (new_cookie_hdr + offset,
1115 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1116 _("Cookie domain `%s' supplied by server is invalid\n"),
1119 GNUNET_memcpy (new_cookie_hdr + offset, tok, strlen (tok));
1120 offset += strlen (tok);
1121 new_cookie_hdr[offset++] = ';';
1123 hdr_val = new_cookie_hdr;
1126 new_location = NULL;
1127 if (0 == strcasecmp (MHD_HTTP_HEADER_LOCATION, hdr_type))
1131 GNUNET_asprintf (&leho_host,
1132 (HTTPS_PORT != s5r->port)
1136 if (0 == strncmp (leho_host,
1138 strlen (leho_host)))
1140 GNUNET_asprintf (&new_location,
1142 (HTTPS_PORT != s5r->port)
1147 hdr_val + strlen (leho_host));
1148 hdr_val = new_location;
1150 GNUNET_free (leho_host);
1152 /* MHD does not allow certain characters in values, remove those */
1153 if (NULL != (tok = strchr (hdr_val, '\n')))
1155 if (NULL != (tok = strchr (hdr_val, '\r')))
1157 if (NULL != (tok = strchr (hdr_val, '\t')))
1159 if (0 != strlen (hdr_val)) /* Rely in MHD to set those */
1161 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1162 "Adding header %s: %s to MHD response\n",
1165 header = GNUNET_new (struct HttpResponseHeader);
1166 header->type = GNUNET_strdup (hdr_type);
1167 header->value = GNUNET_strdup (hdr_val);
1168 GNUNET_CONTAINER_DLL_insert (s5r->header_head,
1173 GNUNET_free_non_null (new_cookie_hdr);
1174 GNUNET_free_non_null (new_location);
1179 create_mhd_response_from_s5r (struct Socks5Request *s5r)
1182 double content_length;
1183 struct HttpResponseHeader *header;
1185 if (NULL != s5r->response)
1187 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1188 "Response already set!\n");
1189 return GNUNET_SYSERR;
1192 GNUNET_break (CURLE_OK ==
1193 curl_easy_getinfo (s5r->curl,
1194 CURLINFO_RESPONSE_CODE,
1196 GNUNET_break (CURLE_OK ==
1197 curl_easy_getinfo (s5r->curl,
1198 CURLINFO_CONTENT_LENGTH_DOWNLOAD,
1200 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1201 "Creating MHD response with code %d and size %d\n",
1202 (int) resp_code, (int) content_length);
1203 s5r->response_code = resp_code;
1204 s5r->response = MHD_create_response_from_callback ((-1 == content_length) ? MHD_SIZE_UNKNOWN : content_length,
1209 for (header = s5r->header_head; NULL != header; header = header->next)
1211 GNUNET_break (MHD_YES ==
1212 MHD_add_response_header (s5r->response,
1217 if (NULL != s5r->leho)
1221 GNUNET_asprintf (&cors_hdr,
1222 (HTTPS_PORT == s5r->port)
1227 GNUNET_break (MHD_YES ==
1228 MHD_add_response_header (s5r->response,
1229 MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN,
1231 GNUNET_free (cors_hdr);
1233 /* force connection to be closed after each request, as we
1234 do not support HTTP pipelining (yet, FIXME!) */
1235 /*GNUNET_break (MHD_YES ==
1236 MHD_add_response_header (s5r->response,
1237 MHD_HTTP_HEADER_CONNECTION,
1243 * Handle response payload data from cURL. Copies it into our `io_buf` to make
1244 * it available to MHD.
1246 * @param ptr pointer to the data
1247 * @param size number of blocks of data
1248 * @param nmemb blocksize
1249 * @param ctx our `struct Socks5Request *`
1250 * @return number of bytes handled
1253 curl_download_cb (void *ptr, size_t size, size_t nmemb, void* ctx)
1255 struct Socks5Request *s5r = ctx;
1256 size_t total = size * nmemb;
1258 if (NULL == s5r->response)
1259 GNUNET_assert (GNUNET_OK == create_mhd_response_from_s5r (s5r));
1261 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
1262 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1264 /* we're still not done with the upload, do not yet
1265 start the download, the IO buffer is still full
1266 with upload data. */
1267 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1268 "Pausing CURL download, waiting for UPLOAD to finish\n");
1269 return CURL_WRITEFUNC_PAUSE; /* not yet ready for data download */
1271 if (sizeof (s5r->io_buf) - s5r->io_len < total)
1273 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1274 "Pausing CURL download, not enough space %lu %lu %lu\n", sizeof (s5r->io_buf),
1275 s5r->io_len, total);
1276 return CURL_WRITEFUNC_PAUSE; /* not enough space */
1278 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
1281 s5r->io_len += total;
1282 if (s5r->io_len == total)
1283 run_mhd_now (s5r->hd);
1289 * cURL callback for uploaded (PUT/POST) data. Copies it into our `io_buf`
1290 * to make it available to MHD.
1292 * @param buf where to write the data
1293 * @param size number of bytes per member
1294 * @param nmemb number of members available in @a buf
1295 * @param cls our `struct Socks5Request` that generated the data
1296 * @return number of bytes copied to @a buf
1299 curl_upload_cb (void *buf, size_t size, size_t nmemb, void *cls)
1301 struct Socks5Request *s5r = cls;
1302 size_t len = size * nmemb;
1305 if ( (0 == s5r->io_len) &&
1306 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1308 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1309 "Pausing CURL UPLOAD, need more data\n");
1310 return CURL_READFUNC_PAUSE;
1312 if ( (0 == s5r->io_len) &&
1313 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1315 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1316 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1317 "Completed CURL UPLOAD\n");
1318 return 0; /* upload finished, can now download */
1320 if ( (SOCKS5_SOCKET_UPLOAD_STARTED != s5r->state) &&
1321 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1324 return CURL_READFUNC_ABORT;
1326 to_copy = GNUNET_MIN (s5r->io_len,
1328 GNUNET_memcpy (buf, s5r->io_buf, to_copy);
1329 memmove (s5r->io_buf,
1330 &s5r->io_buf[to_copy],
1331 s5r->io_len - to_copy);
1332 s5r->io_len -= to_copy;
1333 if (s5r->io_len + to_copy == sizeof (s5r->io_buf))
1334 run_mhd_now (s5r->hd); /* got more space for upload now */
1339 /* ************************** main loop of cURL interaction ****************** */
1343 * Task that is run when we are ready to receive more data
1346 * @param cls closure
1349 curl_task_download (void *cls);
1353 * Ask cURL for the select() sets and schedule cURL operations.
1356 curl_download_prepare ()
1363 struct GNUNET_NETWORK_FDSet *grs;
1364 struct GNUNET_NETWORK_FDSet *gws;
1366 struct GNUNET_TIME_Relative rtime;
1368 if (NULL != curl_download_task)
1370 GNUNET_SCHEDULER_cancel (curl_download_task);
1371 curl_download_task = NULL;
1377 if (CURLM_OK != (mret = curl_multi_fdset (curl_multi, &rs, &ws, &es, &max)))
1379 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1380 "%s failed at %s:%d: `%s'\n",
1381 "curl_multi_fdset", __FILE__, __LINE__,
1382 curl_multi_strerror (mret));
1386 GNUNET_break (CURLM_OK == curl_multi_timeout (curl_multi, &to));
1388 rtime = GNUNET_TIME_UNIT_FOREVER_REL;
1390 rtime = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, to);
1393 grs = GNUNET_NETWORK_fdset_create ();
1394 gws = GNUNET_NETWORK_fdset_create ();
1395 GNUNET_NETWORK_fdset_copy_native (grs, &rs, max + 1);
1396 GNUNET_NETWORK_fdset_copy_native (gws, &ws, max + 1);
1397 curl_download_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1400 &curl_task_download, curl_multi);
1401 GNUNET_NETWORK_fdset_destroy (gws);
1402 GNUNET_NETWORK_fdset_destroy (grs);
1406 curl_download_task = GNUNET_SCHEDULER_add_delayed (rtime,
1407 &curl_task_download,
1414 * Task that is run when we are ready to receive more data from curl.
1416 * @param cls closure, NULL
1419 curl_task_download (void *cls)
1423 struct CURLMsg *msg;
1425 struct Socks5Request *s5r;
1427 curl_download_task = NULL;
1431 mret = curl_multi_perform (curl_multi, &running);
1432 while (NULL != (msg = curl_multi_info_read (curl_multi, &msgnum)))
1434 GNUNET_break (CURLE_OK ==
1435 curl_easy_getinfo (msg->easy_handle,
1446 /* documentation says this is not used */
1450 switch (msg->data.result)
1453 case CURLE_GOT_NOTHING:
1454 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1455 "CURL download completed.\n");
1456 if (NULL == s5r->response)
1457 GNUNET_assert (GNUNET_OK == create_mhd_response_from_s5r (s5r));
1458 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1459 run_mhd_now (s5r->hd);
1462 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1463 "Download curl failed: %s\n",
1464 curl_easy_strerror (msg->data.result));
1465 /* FIXME: indicate error somehow? close MHD connection badly as well? */
1466 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1467 run_mhd_now (s5r->hd);
1470 if (NULL == s5r->response)
1471 s5r->response = curl_failure_response;
1474 /* documentation says this is not used */
1478 /* unexpected status code */
1483 } while (mret == CURLM_CALL_MULTI_PERFORM);
1484 if (CURLM_OK != mret)
1485 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1486 "%s failed at %s:%d: `%s'\n",
1487 "curl_multi_perform", __FILE__, __LINE__,
1488 curl_multi_strerror (mret));
1491 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1492 "Suspending cURL multi loop, no more events pending\n");
1493 return; /* nothing more in progress */
1495 curl_download_prepare ();
1499 /* ********************************* MHD response generation ******************* */
1503 * Read HTTP request header field from the request. Copies the fields
1504 * over to the 'headers' that will be given to curl. However, 'Host'
1505 * is substituted with the LEHO if present. We also change the
1506 * 'Connection' header value to "close" as the proxy does not support
1509 * @param cls our `struct Socks5Request`
1510 * @param kind value kind
1511 * @param key field key
1512 * @param value field value
1513 * @return MHD_YES to continue to iterate
1516 con_val_iter (void *cls,
1517 enum MHD_ValueKind kind,
1521 struct Socks5Request *s5r = cls;
1524 if ( (0 == strcasecmp (MHD_HTTP_HEADER_HOST, key)) &&
1525 (NULL != s5r->leho) )
1527 if (0 == strcasecmp (MHD_HTTP_HEADER_CONTENT_LENGTH, key))
1529 if (0 == strcasecmp (MHD_HTTP_HEADER_ACCEPT_ENCODING, key))
1531 GNUNET_asprintf (&hdr,
1535 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1536 "Adding HEADER `%s' to HTTP request\n",
1538 s5r->headers = curl_slist_append (s5r->headers,
1546 * Main MHD callback for handling requests.
1549 * @param con MHD connection handle
1550 * @param url the url in the request
1551 * @param meth the HTTP method used ("GET", "PUT", etc.)
1552 * @param ver the HTTP version string (i.e. "HTTP/1.1")
1553 * @param upload_data the data being uploaded (excluding HEADERS,
1554 * for a POST that fits into memory and that is encoded
1555 * with a supported encoding, the POST data will NOT be
1556 * given in upload_data and is instead available as
1557 * part of MHD_get_connection_values; very large POST
1558 * data *will* be made available incrementally in
1560 * @param upload_data_size set initially to the size of the
1561 * @a upload_data provided; the method must update this
1562 * value to the number of bytes NOT processed;
1563 * @param con_cls pointer to location where we store the 'struct Request'
1564 * @return MHD_YES if the connection was handled successfully,
1565 * MHD_NO if the socket must be closed due to a serious
1566 * error while handling the request
1569 create_response (void *cls,
1570 struct MHD_Connection *con,
1574 const char *upload_data,
1575 size_t *upload_data_size,
1578 struct Socks5Request *s5r = *con_cls;
1581 char ipstring[INET6_ADDRSTRLEN];
1582 char ipaddr[INET6_ADDRSTRLEN + 2];
1583 const struct sockaddr *sa;
1584 const struct sockaddr_in *s4;
1585 const struct sockaddr_in6 *s6;
1595 if (SOCKS5_SOCKET_WITH_MHD == s5r->state)
1597 /* first time here, initialize curl handle */
1598 sa = (const struct sockaddr *) &s5r->destination_address;
1599 switch (sa->sa_family)
1602 s4 = (const struct sockaddr_in *) &s5r->destination_address;
1603 if (NULL == inet_ntop (AF_INET,
1611 GNUNET_snprintf (ipaddr,
1615 port = ntohs (s4->sin_port);
1618 s6 = (const struct sockaddr_in6 *) &s5r->destination_address;
1619 if (NULL == inet_ntop (AF_INET6,
1627 GNUNET_snprintf (ipaddr,
1631 port = ntohs (s6->sin6_port);
1637 if (NULL == s5r->curl)
1638 s5r->curl = curl_easy_init ();
1639 if (NULL == s5r->curl)
1640 return MHD_queue_response (con,
1641 MHD_HTTP_INTERNAL_SERVER_ERROR,
1642 curl_failure_response);
1643 curl_easy_setopt (s5r->curl, CURLOPT_HEADERFUNCTION, &curl_check_hdr);
1644 curl_easy_setopt (s5r->curl, CURLOPT_HEADERDATA, s5r);
1645 curl_easy_setopt (s5r->curl, CURLOPT_FOLLOWLOCATION, 0);
1646 curl_easy_setopt (s5r->curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
1647 curl_easy_setopt (s5r->curl, CURLOPT_CONNECTTIMEOUT, 600L);
1648 curl_easy_setopt (s5r->curl, CURLOPT_TIMEOUT, 600L);
1649 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1650 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_CONTENT_DECODING, 0);
1651 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_TRANSFER_DECODING, 0);
1652 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1653 curl_easy_setopt (s5r->curl, CURLOPT_PRIVATE, s5r);
1654 curl_easy_setopt (s5r->curl, CURLOPT_VERBOSE, 0);
1656 * Pre-populate cache to resolve Hostname.
1657 * This is necessary as the DNS name in the CURLOPT_URL is used
1658 * for SNI http://de.wikipedia.org/wiki/Server_Name_Indication
1660 if (NULL != s5r->leho)
1662 GNUNET_asprintf (&curl_hosts,
1667 s5r->hosts = curl_slist_append(NULL, curl_hosts);
1668 curl_easy_setopt(s5r->curl, CURLOPT_RESOLVE, s5r->hosts);
1669 GNUNET_free (curl_hosts);
1671 GNUNET_asprintf (&curlurl,
1672 (HTTPS_PORT != s5r->port)
1674 : "https://%s:%d%s",
1680 curl_easy_setopt (s5r->curl,
1683 GNUNET_free (curlurl);
1684 if (0 == strcasecmp (meth, MHD_HTTP_METHOD_PUT))
1686 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1687 curl_easy_setopt (s5r->curl, CURLOPT_UPLOAD, 1);
1688 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1689 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1690 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1691 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1693 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_POST))
1695 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1696 curl_easy_setopt (s5r->curl, CURLOPT_POST, 1L);
1697 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1698 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1699 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1700 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1702 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_HEAD))
1704 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1705 curl_easy_setopt (s5r->curl, CURLOPT_NOBODY, 1);
1707 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_OPTIONS))
1709 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1710 curl_easy_setopt (s5r->curl, CURLOPT_CUSTOMREQUEST, "OPTIONS");
1712 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_GET))
1714 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1715 curl_easy_setopt (s5r->curl, CURLOPT_HTTPGET, 1);
1716 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1717 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1721 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1722 _("Unsupported HTTP method `%s'\n"),
1724 curl_easy_cleanup (s5r->curl);
1729 if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_0))
1731 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
1733 else if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_1))
1735 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
1739 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_NONE);
1742 if (HTTPS_PORT == s5r->port)
1744 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);
1745 if (NULL != s5r->dane_data)
1746 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYPEER, 0L);
1748 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYPEER, 1L);
1749 /* Disable cURL checking the hostname, as we will check ourselves
1750 as only we have the domain name or the LEHO or the DANE record */
1751 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYHOST, 0L);
1755 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_NONE);
1758 if (CURLM_OK != curl_multi_add_handle (curl_multi, s5r->curl))
1761 curl_easy_cleanup (s5r->curl);
1765 MHD_get_connection_values (con,
1767 &con_val_iter, s5r);
1768 curl_easy_setopt (s5r->curl, CURLOPT_HTTPHEADER, s5r->headers);
1769 curl_download_prepare ();
1773 /* continuing to process request */
1774 if (0 != *upload_data_size)
1777 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1778 "Processing %u bytes UPLOAD\n",
1779 (unsigned int) *upload_data_size);
1781 /* FIXME: This must be set or a header with Transfer-Encoding: chunked. Else
1782 * upload callback is not called!
1784 curl_easy_setopt (s5r->curl, CURLOPT_POSTFIELDSIZE, *upload_data_size);
1786 left = GNUNET_MIN (*upload_data_size,
1787 sizeof (s5r->io_buf) - s5r->io_len);
1788 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
1791 s5r->io_len += left;
1792 *upload_data_size -= left;
1793 GNUNET_assert (NULL != s5r->curl);
1794 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
1797 if (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state)
1799 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1800 "Finished processing UPLOAD\n");
1801 s5r->state = SOCKS5_SOCKET_UPLOAD_DONE;
1803 if (NULL == s5r->response)
1805 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1806 "Queueing response with MHD\n");
1807 run_mhd_now (s5r->hd);
1808 return MHD_queue_response (con,
1814 /* ******************** MHD HTTP setup and event loop ******************** */
1818 * Function called when MHD decides that we are done with a request.
1821 * @param connection connection handle
1822 * @param con_cls value as set by the last call to
1823 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
1824 * @param toe reason for request termination (ignored)
1827 mhd_completed_cb (void *cls,
1828 struct MHD_Connection *connection,
1830 enum MHD_RequestTerminationCode toe)
1832 struct Socks5Request *s5r = *con_cls;
1833 struct HttpResponseHeader *header;
1837 if (MHD_REQUEST_TERMINATED_COMPLETED_OK != toe)
1838 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1839 "MHD encountered error handling request: %d\n",
1841 if (NULL != s5r->curl)
1843 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1844 "Resetting cURL handle\n");
1845 curl_multi_remove_handle (curl_multi, s5r->curl);
1846 curl_slist_free_all (s5r->headers);
1847 s5r->headers = NULL;
1848 curl_easy_reset (s5r->curl);
1853 if ( (NULL != s5r->response) &&
1854 (curl_failure_response != s5r->response) )
1855 MHD_destroy_response (s5r->response);
1856 for (header = s5r->header_head; header != NULL; header = s5r->header_head)
1858 GNUNET_CONTAINER_DLL_remove (s5r->header_head,
1861 GNUNET_free (header->type);
1862 GNUNET_free (header->value);
1863 GNUNET_free (header);
1865 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Finished request for %s\n", s5r->url);
1866 GNUNET_free (s5r->url);
1867 s5r->state = SOCKS5_SOCKET_WITH_MHD;
1869 s5r->response = NULL;
1875 * Function called when MHD connection is opened or closed.
1878 * @param connection connection handle
1879 * @param con_cls value as set by the last call to
1880 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
1881 * @param toe connection notification type
1884 mhd_connection_cb (void *cls,
1885 struct MHD_Connection *connection,
1887 enum MHD_ConnectionNotificationCode cnc)
1889 struct Socks5Request *s5r;
1890 const union MHD_ConnectionInfo *ci;
1895 case MHD_CONNECTION_NOTIFY_STARTED:
1896 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection started...\n");
1897 ci = MHD_get_connection_info (connection,
1898 MHD_CONNECTION_INFO_CONNECTION_FD);
1904 sock = ci->connect_fd;
1905 for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
1907 if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
1909 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1910 "Context set...\n");
1911 s5r->ssl_checked = GNUNET_NO;
1917 case MHD_CONNECTION_NOTIFY_CLOSED:
1918 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1919 "Connection closed... cleaning up\n");
1923 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1924 "Connection stale!\n");
1928 curl_download_prepare ();
1937 * Function called when MHD first processes an incoming connection.
1938 * Gives us the respective URI information.
1940 * We use this to associate the `struct MHD_Connection` with our
1941 * internal `struct Socks5Request` data structure (by checking
1942 * for matching sockets).
1944 * @param cls the HTTP server handle (a `struct MhdHttpList`)
1945 * @param url the URL that is being requested
1946 * @param connection MHD connection object for the request
1947 * @return the `struct Socks5Request` that this @a connection is for
1950 mhd_log_callback (void *cls,
1952 struct MHD_Connection *connection)
1954 struct Socks5Request *s5r;
1955 const union MHD_ConnectionInfo *ci;
1957 ci = MHD_get_connection_info (connection,
1958 MHD_CONNECTION_INFO_SOCKET_CONTEXT);
1959 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Processing %s\n", url);
1965 s5r = ci->socket_context;
1966 if (NULL != s5r->url)
1971 s5r->url = GNUNET_strdup (url);
1972 if (NULL != s5r->timeout_task)
1974 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
1975 s5r->timeout_task = NULL;
1977 GNUNET_assert (s5r->state == SOCKS5_SOCKET_WITH_MHD);
1983 * Kill the given MHD daemon.
1985 * @param hd daemon to stop
1988 kill_httpd (struct MhdHttpList *hd)
1990 GNUNET_CONTAINER_DLL_remove (mhd_httpd_head,
1993 GNUNET_free_non_null (hd->domain);
1994 MHD_stop_daemon (hd->daemon);
1995 if (NULL != hd->httpd_task)
1997 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1998 hd->httpd_task = NULL;
2000 GNUNET_free_non_null (hd->proxy_cert);
2008 * Task run whenever HTTP server is idle for too long. Kill it.
2010 * @param cls the `struct MhdHttpList *`
2013 kill_httpd_task (void *cls)
2015 struct MhdHttpList *hd = cls;
2017 hd->httpd_task = NULL;
2023 * Task run whenever HTTP server operations are pending.
2025 * @param cls the `struct MhdHttpList *` of the daemon that is being run
2028 do_httpd (void *cls);
2032 * Schedule MHD. This function should be called initially when an
2033 * MHD is first getting its client socket, and will then automatically
2034 * always be called later whenever there is work to be done.
2036 * @param hd the daemon to schedule
2039 schedule_httpd (struct MhdHttpList *hd)
2044 struct GNUNET_NETWORK_FDSet *wrs;
2045 struct GNUNET_NETWORK_FDSet *wws;
2048 MHD_UNSIGNED_LONG_LONG timeout;
2049 struct GNUNET_TIME_Relative tv;
2055 if (MHD_YES != MHD_get_fdset (hd->daemon, &rs, &ws, &es, &max))
2060 haveto = MHD_get_timeout (hd->daemon, &timeout);
2061 if (MHD_YES == haveto)
2062 tv.rel_value_us = (uint64_t) timeout * 1000LL;
2064 tv = GNUNET_TIME_UNIT_FOREVER_REL;
2067 wrs = GNUNET_NETWORK_fdset_create ();
2068 wws = GNUNET_NETWORK_fdset_create ();
2069 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
2070 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
2077 if (NULL != hd->httpd_task)
2079 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2080 hd->httpd_task = NULL;
2082 if ( (MHD_YES != haveto) &&
2086 /* daemon is idle, kill after timeout */
2087 hd->httpd_task = GNUNET_SCHEDULER_add_delayed (MHD_CACHE_TIMEOUT,
2094 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2099 GNUNET_NETWORK_fdset_destroy (wrs);
2101 GNUNET_NETWORK_fdset_destroy (wws);
2106 * Task run whenever HTTP server operations are pending.
2108 * @param cls the `struct MhdHttpList` of the daemon that is being run
2111 do_httpd (void *cls)
2113 struct MhdHttpList *hd = cls;
2115 hd->httpd_task = NULL;
2116 MHD_run (hd->daemon);
2117 schedule_httpd (hd);
2122 * Run MHD now, we have extra data ready for the callback.
2124 * @param hd the daemon to run now.
2127 run_mhd_now (struct MhdHttpList *hd)
2129 if (NULL != hd->httpd_task)
2130 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2131 hd->httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd,
2137 * Read file in filename
2139 * @param filename file to read
2140 * @param size pointer where filesize is stored
2141 * @return NULL on error
2144 load_file (const char* filename,
2151 GNUNET_DISK_file_size (filename, &fsize,
2152 GNUNET_YES, GNUNET_YES))
2154 if (fsize > MAX_PEM_SIZE)
2156 *size = (unsigned int) fsize;
2157 buffer = GNUNET_malloc (*size);
2158 if (fsize != GNUNET_DISK_fn_read (filename, buffer, (size_t) fsize))
2160 GNUNET_free (buffer);
2168 * Load PEM key from file
2170 * @param key where to store the data
2171 * @param keyfile path to the PEM file
2172 * @return #GNUNET_OK on success
2175 load_key_from_file (gnutls_x509_privkey_t key,
2176 const char* keyfile)
2178 gnutls_datum_t key_data;
2181 key_data.data = load_file (keyfile, &key_data.size);
2182 if (NULL == key_data.data)
2183 return GNUNET_SYSERR;
2184 ret = gnutls_x509_privkey_import (key, &key_data,
2185 GNUTLS_X509_FMT_PEM);
2186 if (GNUTLS_E_SUCCESS != ret)
2188 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2189 _("Unable to import private key from file `%s'\n"),
2192 GNUNET_free_non_null (key_data.data);
2193 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2198 * Load cert from file
2200 * @param crt struct to store data in
2201 * @param certfile path to pem file
2202 * @return #GNUNET_OK on success
2205 load_cert_from_file (gnutls_x509_crt_t crt,
2206 const char* certfile)
2208 gnutls_datum_t cert_data;
2211 cert_data.data = load_file (certfile, &cert_data.size);
2212 if (NULL == cert_data.data)
2213 return GNUNET_SYSERR;
2214 ret = gnutls_x509_crt_import (crt, &cert_data,
2215 GNUTLS_X509_FMT_PEM);
2216 if (GNUTLS_E_SUCCESS != ret)
2218 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2219 _("Unable to import certificate %s\n"), certfile);
2221 GNUNET_free_non_null (cert_data.data);
2222 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2227 * Generate new certificate for specific name
2229 * @param name the subject name to generate a cert for
2230 * @return a struct holding the PEM data, NULL on error
2232 static struct ProxyGNSCertificate *
2233 generate_gns_certificate (const char *name)
2235 unsigned int serial;
2236 size_t key_buf_size;
2237 size_t cert_buf_size;
2238 gnutls_x509_crt_t request;
2241 struct ProxyGNSCertificate *pgc;
2243 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2244 "Generating TLS/SSL certificate for `%s'\n",
2246 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_init (&request));
2247 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_key (request, proxy_ca.key));
2248 pgc = GNUNET_new (struct ProxyGNSCertificate);
2249 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COUNTRY_NAME,
2251 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_ORGANIZATION_NAME,
2252 0, "GNU Name System", 4);
2253 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COMMON_NAME,
2254 0, name, strlen (name));
2255 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_version (request, 3));
2256 gnutls_rnd (GNUTLS_RND_NONCE, &serial, sizeof (serial));
2257 gnutls_x509_crt_set_serial (request,
2260 etime = time (NULL);
2261 tm_data = localtime (&etime);
2263 etime = mktime(tm_data);
2264 gnutls_x509_crt_set_activation_time (request,
2267 etime = mktime (tm_data);
2268 gnutls_x509_crt_set_expiration_time (request,
2270 gnutls_x509_crt_sign (request,
2273 key_buf_size = sizeof (pgc->key);
2274 cert_buf_size = sizeof (pgc->cert);
2275 gnutls_x509_crt_export (request, GNUTLS_X509_FMT_PEM,
2276 pgc->cert, &cert_buf_size);
2277 gnutls_x509_privkey_export (proxy_ca.key, GNUTLS_X509_FMT_PEM,
2278 pgc->key, &key_buf_size);
2279 gnutls_x509_crt_deinit (request);
2285 * Function called by MHD with errors, suppresses them all.
2287 * @param cls closure
2288 * @param fm format string (`printf()`-style)
2289 * @param ap arguments to @a fm
2292 mhd_error_log_callback (void *cls,
2301 * Lookup (or create) an SSL MHD instance for a particular domain.
2303 * @param domain the domain the SSL daemon has to serve
2304 * @return NULL on error
2306 static struct MhdHttpList *
2307 lookup_ssl_httpd (const char* domain)
2309 struct MhdHttpList *hd;
2310 struct ProxyGNSCertificate *pgc;
2317 for (hd = mhd_httpd_head; NULL != hd; hd = hd->next)
2318 if ( (NULL != hd->domain) &&
2319 (0 == strcmp (hd->domain, domain)) )
2321 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2322 "Starting fresh MHD HTTPS instance for domain `%s'\n",
2324 pgc = generate_gns_certificate (domain);
2325 hd = GNUNET_new (struct MhdHttpList);
2326 hd->is_ssl = GNUNET_YES;
2327 hd->domain = GNUNET_strdup (domain);
2328 hd->proxy_cert = pgc;
2329 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_SSL | MHD_USE_NO_LISTEN_SOCKET,
2332 &create_response, hd,
2333 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
2334 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
2335 MHD_OPTION_NOTIFY_CONNECTION, &mhd_connection_cb, NULL,
2336 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
2337 MHD_OPTION_EXTERNAL_LOGGER, &mhd_error_log_callback, NULL,
2338 MHD_OPTION_HTTPS_MEM_KEY, pgc->key,
2339 MHD_OPTION_HTTPS_MEM_CERT, pgc->cert,
2341 if (NULL == hd->daemon)
2347 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
2355 * Task run when a Socks5Request somehow fails to be associated with
2356 * an MHD connection (i.e. because the client never speaks HTTP after
2357 * the SOCKS5 handshake). Clean up.
2359 * @param cls the `struct Socks5Request *`
2362 timeout_s5r_handshake (void *cls)
2364 struct Socks5Request *s5r = cls;
2366 s5r->timeout_task = NULL;
2372 * We're done with the Socks5 protocol, now we need to pass the
2373 * connection data through to the final destination, either
2374 * direct (if the protocol might not be HTTP), or via MHD
2375 * (if the port looks like it should be HTTP).
2377 * @param s5r socks request that has reached the final stage
2380 setup_data_transfer (struct Socks5Request *s5r)
2382 struct MhdHttpList *hd;
2384 const struct sockaddr *addr;
2391 GNUNET_asprintf (&domain,
2395 hd = lookup_ssl_httpd (domain);
2398 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2399 _("Failed to start HTTPS server for `%s'\n"),
2402 GNUNET_free (domain);
2408 GNUNET_assert (NULL != httpd);
2412 fd = GNUNET_NETWORK_get_fd (s5r->sock);
2413 addr = GNUNET_NETWORK_get_addr (s5r->sock);
2414 len = GNUNET_NETWORK_get_addrlen (s5r->sock);
2415 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2416 if (MHD_YES != MHD_add_connection (hd->daemon, fd, addr, len))
2418 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2419 _("Failed to pass client to MHD\n"));
2421 GNUNET_free (domain);
2425 schedule_httpd (hd);
2426 s5r->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_HANDSHAKE_TIMEOUT,
2427 &timeout_s5r_handshake,
2429 GNUNET_free (domain);
2433 /* ********************* SOCKS handling ************************* */
2437 * Write data from buffer to socks5 client, then continue with state machine.
2439 * @param cls the closure with the `struct Socks5Request`
2442 do_write (void *cls)
2444 struct Socks5Request *s5r = cls;
2448 len = GNUNET_NETWORK_socket_send (s5r->sock,
2453 /* write error: connection closed, shutdown, etc.; just clean up */
2454 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2461 s5r->wbuf_len - len);
2462 s5r->wbuf_len -= len;
2463 if (s5r->wbuf_len > 0)
2465 /* not done writing */
2467 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2473 /* we're done writing, continue with state machine! */
2480 case SOCKS5_REQUEST:
2481 GNUNET_assert (NULL != s5r->rtask);
2483 case SOCKS5_DATA_TRANSFER:
2484 setup_data_transfer (s5r);
2486 case SOCKS5_WRITE_THEN_CLEANUP:
2497 * Return a server response message indicating a failure to the client.
2499 * @param s5r request to return failure code for
2500 * @param sc status code to return
2503 signal_socks_failure (struct Socks5Request *s5r,
2504 enum Socks5StatusCode sc)
2506 struct Socks5ServerResponseMessage *s_resp;
2508 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2509 memset (s_resp, 0, sizeof (struct Socks5ServerResponseMessage));
2510 s_resp->version = SOCKS_VERSION_5;
2512 s5r->state = SOCKS5_WRITE_THEN_CLEANUP;
2513 if (NULL != s5r->wtask)
2515 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2522 * Return a server response message indicating success.
2524 * @param s5r request to return success status message for
2527 signal_socks_success (struct Socks5Request *s5r)
2529 struct Socks5ServerResponseMessage *s_resp;
2531 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2532 s_resp->version = SOCKS_VERSION_5;
2533 s_resp->reply = SOCKS5_STATUS_REQUEST_GRANTED;
2534 s_resp->reserved = 0;
2535 s_resp->addr_type = SOCKS5_AT_IPV4;
2536 /* zero out IPv4 address and port */
2539 sizeof (struct in_addr) + sizeof (uint16_t));
2540 s5r->wbuf_len += sizeof (struct Socks5ServerResponseMessage) +
2541 sizeof (struct in_addr) + sizeof (uint16_t);
2542 if (NULL == s5r->wtask)
2544 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2551 * Process GNS results for target domain.
2553 * @param cls the `struct Socks5Request *`
2554 * @param rd_count number of records returned
2555 * @param rd record data
2558 handle_gns_result (void *cls,
2560 const struct GNUNET_GNSRECORD_Data *rd)
2562 struct Socks5Request *s5r = cls;
2564 const struct GNUNET_GNSRECORD_Data *r;
2567 s5r->gns_lookup = NULL;
2569 for (i=0;i<rd_count;i++)
2572 switch (r->record_type)
2574 case GNUNET_DNSPARSER_TYPE_A:
2576 struct sockaddr_in *in;
2578 if (sizeof (struct in_addr) != r->data_size)
2580 GNUNET_break_op (0);
2583 if (GNUNET_YES == got_ip)
2586 GNUNET_NETWORK_test_pf (PF_INET))
2588 got_ip = GNUNET_YES;
2589 in = (struct sockaddr_in *) &s5r->destination_address;
2590 in->sin_family = AF_INET;
2591 GNUNET_memcpy (&in->sin_addr,
2594 in->sin_port = htons (s5r->port);
2595 #if HAVE_SOCKADDR_IN_SIN_LEN
2596 in->sin_len = sizeof (*in);
2600 case GNUNET_DNSPARSER_TYPE_AAAA:
2602 struct sockaddr_in6 *in;
2604 if (sizeof (struct in6_addr) != r->data_size)
2606 GNUNET_break_op (0);
2609 if (GNUNET_YES == got_ip)
2612 GNUNET_NETWORK_test_pf (PF_INET))
2614 /* FIXME: allow user to disable IPv6 per configuration option... */
2615 got_ip = GNUNET_YES;
2616 in = (struct sockaddr_in6 *) &s5r->destination_address;
2617 in->sin6_family = AF_INET6;
2618 GNUNET_memcpy (&in->sin6_addr,
2621 in->sin6_port = htons (s5r->port);
2622 #if HAVE_SOCKADDR_IN_SIN_LEN
2623 in->sin6_len = sizeof (*in);
2627 case GNUNET_GNSRECORD_TYPE_VPN:
2628 GNUNET_break (0); /* should have been translated within GNS */
2630 case GNUNET_GNSRECORD_TYPE_LEHO:
2631 GNUNET_free_non_null (s5r->leho);
2632 s5r->leho = GNUNET_strndup (r->data,
2635 case GNUNET_GNSRECORD_TYPE_BOX:
2637 const struct GNUNET_GNSRECORD_BoxRecord *box;
2639 if (r->data_size < sizeof (struct GNUNET_GNSRECORD_BoxRecord))
2641 GNUNET_break_op (0);
2645 if ( (ntohl (box->record_type) != GNUNET_DNSPARSER_TYPE_TLSA) ||
2646 (ntohs (box->protocol) != IPPROTO_TCP) ||
2647 (ntohs (box->service) != s5r->port) )
2648 break; /* BOX record does not apply */
2649 GNUNET_free_non_null (s5r->dane_data);
2650 s5r->dane_data_len = r->data_size - sizeof (struct GNUNET_GNSRECORD_BoxRecord);
2651 s5r->dane_data = GNUNET_malloc (s5r->dane_data_len);
2652 GNUNET_memcpy (s5r->dane_data,
2654 s5r->dane_data_len);
2662 if (GNUNET_YES != got_ip)
2664 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2665 "Name resolution failed to yield useful IP address.\n");
2666 signal_socks_failure (s5r,
2667 SOCKS5_STATUS_GENERAL_FAILURE);
2670 s5r->state = SOCKS5_DATA_TRANSFER;
2671 signal_socks_success (s5r);
2676 * Remove the first @a len bytes from the beginning of the read buffer.
2678 * @param s5r the handle clear the read buffer for
2679 * @param len number of bytes in read buffer to advance
2682 clear_from_s5r_rbuf (struct Socks5Request *s5r,
2685 GNUNET_assert (len <= s5r->rbuf_len);
2688 s5r->rbuf_len - len);
2689 s5r->rbuf_len -= len;
2694 * Method called to with the ego we are to use for the lookup,
2695 * when the ego is determined by a name.
2697 * @param cls closure (NULL, unused)
2698 * @param ego ego handle, NULL if not found
2701 identity_zone_cb (void *cls,
2702 const struct GNUNET_IDENTITY_Ego *ego)
2704 struct Socks5Request *s5r = cls;
2705 struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
2710 signal_socks_failure (s5r,
2711 SOCKS5_STATUS_GENERAL_FAILURE);
2715 GNUNET_IDENTITY_ego_get_public_key (ego,
2717 s5r->gns_lookup = GNUNET_GNS_lookup (gns_handle,
2720 GNUNET_DNSPARSER_TYPE_A,
2721 GNUNET_NO /* only cached */,
2729 * Obtain TLD from @a name
2731 * @param name a name
2732 * @return the part of @a name after the last ".",
2733 * or @a name if @a name does not contain a "."
2736 get_tld (const char *name)
2740 tld = strrchr (name,
2741 (unsigned char) '.');
2745 tld++; /* skip the '.' */
2750 * Eat the TLD of the given @a name.
2752 * @param name a name
2755 eat_tld (char *name)
2759 GNUNET_assert (0 < strlen (name));
2760 tld = strrchr (name,
2761 (unsigned char) '.');
2764 GNUNET_GNS_MASTERZONE_STR);
2770 * Read data from incoming Socks5 connection
2772 * @param cls the closure with the `struct Socks5Request`
2775 do_s5r_read (void *cls)
2777 struct Socks5Request *s5r = cls;
2778 const struct Socks5ClientHelloMessage *c_hello;
2779 struct Socks5ServerHelloMessage *s_hello;
2780 const struct Socks5ClientRequestMessage *c_req;
2783 const struct GNUNET_SCHEDULER_TaskContext *tc;
2786 struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
2789 tc = GNUNET_SCHEDULER_get_task_context ();
2790 if ( (NULL != tc->read_ready) &&
2791 (GNUNET_NETWORK_fdset_isset (tc->read_ready, s5r->sock)) )
2793 rlen = GNUNET_NETWORK_socket_recv (s5r->sock,
2794 &s5r->rbuf[s5r->rbuf_len],
2795 sizeof (s5r->rbuf) - s5r->rbuf_len);
2798 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2799 "socks5 client disconnected.\n");
2803 s5r->rbuf_len += rlen;
2805 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2808 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2809 "Processing %zu bytes of socks data in state %d\n",
2815 c_hello = (const struct Socks5ClientHelloMessage*) &s5r->rbuf;
2816 if ( (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage)) ||
2817 (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods) )
2818 return; /* need more data */
2819 if (SOCKS_VERSION_5 != c_hello->version)
2821 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2822 _("Unsupported socks version %d\n"),
2823 (int) c_hello->version);
2827 clear_from_s5r_rbuf (s5r,
2828 sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods);
2829 GNUNET_assert (0 == s5r->wbuf_len);
2830 s_hello = (struct Socks5ServerHelloMessage *) &s5r->wbuf;
2831 s5r->wbuf_len = sizeof (struct Socks5ServerHelloMessage);
2832 s_hello->version = SOCKS_VERSION_5;
2833 s_hello->auth_method = SOCKS_AUTH_NONE;
2834 GNUNET_assert (NULL == s5r->wtask);
2835 s5r->wtask = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2838 s5r->state = SOCKS5_REQUEST;
2840 case SOCKS5_REQUEST:
2841 c_req = (const struct Socks5ClientRequestMessage *) &s5r->rbuf;
2842 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage))
2844 switch (c_req->command)
2846 case SOCKS5_CMD_TCP_STREAM:
2850 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2851 _("Unsupported socks command %d\n"),
2852 (int) c_req->command);
2853 signal_socks_failure (s5r,
2854 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED);
2857 switch (c_req->addr_type)
2859 case SOCKS5_AT_IPV4:
2861 const struct in_addr *v4 = (const struct in_addr *) &c_req[1];
2862 const uint16_t *port = (const uint16_t *) &v4[1];
2863 struct sockaddr_in *in;
2865 s5r->port = ntohs (*port);
2866 if (HTTPS_PORT == s5r->port)
2868 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2869 _("SSL connection to plain IPv4 address requested\n"));
2870 signal_socks_failure (s5r,
2871 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE);
2874 alen = sizeof (struct in_addr);
2875 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2876 alen + sizeof (uint16_t))
2877 return; /* need more data */
2878 in = (struct sockaddr_in *) &s5r->destination_address;
2879 in->sin_family = AF_INET;
2881 in->sin_port = *port;
2882 #if HAVE_SOCKADDR_IN_SIN_LEN
2883 in->sin_len = sizeof (*in);
2885 s5r->state = SOCKS5_DATA_TRANSFER;
2888 case SOCKS5_AT_IPV6:
2890 const struct in6_addr *v6 = (const struct in6_addr *) &c_req[1];
2891 const uint16_t *port = (const uint16_t *) &v6[1];
2892 struct sockaddr_in6 *in;
2894 s5r->port = ntohs (*port);
2895 if (HTTPS_PORT == s5r->port)
2897 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2898 _("SSL connection to plain IPv4 address requested\n"));
2899 signal_socks_failure (s5r,
2900 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE);
2903 alen = sizeof (struct in6_addr);
2904 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2905 alen + sizeof (uint16_t))
2906 return; /* need more data */
2907 in = (struct sockaddr_in6 *) &s5r->destination_address;
2908 in->sin6_family = AF_INET6;
2909 in->sin6_addr = *v6;
2910 in->sin6_port = *port;
2911 #if HAVE_SOCKADDR_IN_SIN_LEN
2912 in->sin6_len = sizeof (*in);
2914 s5r->state = SOCKS5_DATA_TRANSFER;
2917 case SOCKS5_AT_DOMAINNAME:
2919 const uint8_t *dom_len;
2920 const char *dom_name;
2921 const uint16_t *port;
2923 dom_len = (const uint8_t *) &c_req[1];
2924 alen = *dom_len + 1;
2925 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2926 alen + sizeof (uint16_t))
2927 return; /* need more data */
2928 dom_name = (const char *) &dom_len[1];
2929 port = (const uint16_t*) &dom_name[*dom_len];
2930 s5r->domain = GNUNET_strndup (dom_name, *dom_len);
2931 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2932 "Requested connection is to %s:%d\n",
2935 s5r->state = SOCKS5_RESOLVING;
2936 s5r->port = ntohs (*port);
2938 s5r->tld = get_tld (s5r->domain);
2940 GNUNET_CRYPTO_ecdsa_public_key_from_string (s5r->tld,
2944 eat_tld (s5r->domain);
2945 s5r->gns_lookup = GNUNET_GNS_lookup (gns_handle,
2948 GNUNET_DNSPARSER_TYPE_A,
2949 GNUNET_NO /* only cached */,
2955 /* TLD is mapped in our config */
2956 GNUNET_asprintf (&dot_tld,
2960 GNUNET_CONFIGURATION_get_value_string (cfg,
2966 GNUNET_CRYPTO_ecdsa_public_key_from_string (zonestr,
2970 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2973 _("Expected a base32-encoded public zone key\n"));
2974 GNUNET_free (zonestr);
2975 GNUNET_free (dot_tld);
2976 signal_socks_failure (s5r,
2977 SOCKS5_STATUS_GENERAL_FAILURE);
2981 GNUNET_free (zonestr);
2982 GNUNET_free (dot_tld);
2983 eat_tld (s5r->domain);
2984 s5r->gns_lookup = GNUNET_GNS_lookup (gns_handle,
2987 GNUNET_DNSPARSER_TYPE_A,
2988 GNUNET_NO /* only cached */,
2994 /* TLD matches against ego */
2995 eat_tld (s5r->domain);
2997 s5r->el = GNUNET_IDENTITY_ego_lookup (cfg,
3004 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3005 _("Unsupported socks address type %d\n"),
3006 (int) c_req->addr_type);
3007 signal_socks_failure (s5r,
3008 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED);
3011 clear_from_s5r_rbuf (s5r,
3012 sizeof (struct Socks5ClientRequestMessage) +
3013 alen + sizeof (uint16_t));
3014 if (0 != s5r->rbuf_len)
3016 /* read more bytes than healthy, why did the client send more!? */
3017 GNUNET_break_op (0);
3018 signal_socks_failure (s5r,
3019 SOCKS5_STATUS_GENERAL_FAILURE);
3022 if (SOCKS5_DATA_TRANSFER == s5r->state)
3024 /* if we are not waiting for GNS resolution, signal success */
3025 signal_socks_success (s5r);
3027 /* We are done reading right now */
3028 GNUNET_SCHEDULER_cancel (s5r->rtask);
3031 case SOCKS5_RESOLVING:
3034 case SOCKS5_DATA_TRANSFER:
3045 * Accept new incoming connections
3047 * @param cls the closure with the lsock4 or lsock6
3048 * @param tc the scheduler context
3051 do_accept (void *cls)
3053 struct GNUNET_NETWORK_Handle *lsock = cls;
3054 struct GNUNET_NETWORK_Handle *s;
3055 struct Socks5Request *s5r;
3057 GNUNET_assert (NULL != lsock);
3058 if (lsock == lsock4)
3059 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3062 else if (lsock == lsock6)
3063 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3068 s = GNUNET_NETWORK_socket_accept (lsock, NULL, NULL);
3071 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "accept");
3074 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3075 "Got an inbound connection, waiting for data\n");
3076 s5r = GNUNET_new (struct Socks5Request);
3077 GNUNET_CONTAINER_DLL_insert (s5r_head,
3081 s5r->state = SOCKS5_INIT;
3082 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3088 /* ******************* General / main code ********************* */
3092 * Task run on shutdown
3094 * @param cls closure
3097 do_shutdown (void *cls)
3099 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3100 "Shutting down...\n");
3101 while (NULL != mhd_httpd_head)
3102 kill_httpd (mhd_httpd_head);
3103 while (NULL != s5r_head)
3104 cleanup_s5r (s5r_head);
3107 GNUNET_NETWORK_socket_close (lsock4);
3112 GNUNET_NETWORK_socket_close (lsock6);
3117 GNUNET_IDENTITY_cancel (id_op);
3120 if (NULL != identity)
3122 GNUNET_IDENTITY_disconnect (identity);
3125 if (NULL != curl_multi)
3127 curl_multi_cleanup (curl_multi);
3130 if (NULL != gns_handle)
3132 GNUNET_GNS_disconnect (gns_handle);
3135 if (NULL != curl_download_task)
3137 GNUNET_SCHEDULER_cancel (curl_download_task);
3138 curl_download_task = NULL;
3142 GNUNET_SCHEDULER_cancel (ltask4);
3147 GNUNET_SCHEDULER_cancel (ltask6);
3150 gnutls_x509_crt_deinit (proxy_ca.cert);
3151 gnutls_x509_privkey_deinit (proxy_ca.key);
3152 gnutls_global_deinit ();
3157 * Create an IPv4 listen socket bound to our port.
3159 * @return NULL on error
3161 static struct GNUNET_NETWORK_Handle *
3164 struct GNUNET_NETWORK_Handle *ls;
3165 struct sockaddr_in sa4;
3168 memset (&sa4, 0, sizeof (sa4));
3169 sa4.sin_family = AF_INET;
3170 sa4.sin_port = htons (port);
3171 #if HAVE_SOCKADDR_IN_SIN_LEN
3172 sa4.sin_len = sizeof (sa4);
3174 ls = GNUNET_NETWORK_socket_create (AF_INET,
3180 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa4,
3184 GNUNET_NETWORK_socket_close (ls);
3193 * Create an IPv6 listen socket bound to our port.
3195 * @return NULL on error
3197 static struct GNUNET_NETWORK_Handle *
3200 struct GNUNET_NETWORK_Handle *ls;
3201 struct sockaddr_in6 sa6;
3204 memset (&sa6, 0, sizeof (sa6));
3205 sa6.sin6_family = AF_INET6;
3206 sa6.sin6_port = htons (port);
3207 #if HAVE_SOCKADDR_IN_SIN_LEN
3208 sa6.sin6_len = sizeof (sa6);
3210 ls = GNUNET_NETWORK_socket_create (AF_INET6,
3216 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa6,
3220 GNUNET_NETWORK_socket_close (ls);
3229 * Continue initialization after we have our zone information.
3234 struct MhdHttpList *hd;
3236 /* Open listen socket for socks proxy */
3237 lsock6 = bind_v6 ();
3239 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
3242 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock6, 5))
3244 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
3245 GNUNET_NETWORK_socket_close (lsock6);
3250 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3251 lsock6, &do_accept, lsock6);
3254 lsock4 = bind_v4 ();
3256 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
3259 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock4, 5))
3261 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
3262 GNUNET_NETWORK_socket_close (lsock4);
3267 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3268 lsock4, &do_accept, lsock4);
3271 if ( (NULL == lsock4) &&
3274 GNUNET_SCHEDULER_shutdown ();
3277 if (0 != curl_global_init (CURL_GLOBAL_WIN32))
3279 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3280 "cURL global init failed!\n");
3281 GNUNET_SCHEDULER_shutdown ();
3284 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3285 "Proxy listens on port %llu\n",
3288 /* start MHD daemon for HTTP */
3289 hd = GNUNET_new (struct MhdHttpList);
3290 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_NO_LISTEN_SOCKET,
3293 &create_response, hd,
3294 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
3295 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
3296 MHD_OPTION_NOTIFY_CONNECTION, &mhd_connection_cb, NULL,
3297 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
3299 if (NULL == hd->daemon)
3302 GNUNET_SCHEDULER_shutdown ();
3306 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head, mhd_httpd_tail, hd);
3311 * Method called to inform about the egos of the master zone of this peer.
3313 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
3314 * this function is only called ONCE, and 'NULL' being passed in
3315 * @a ego does indicate an error (i.e. name is taken or no default
3316 * value is known). If @a ego is non-NULL and if '*ctx'
3317 * is set in those callbacks, the value WILL be passed to a subsequent
3318 * call to the identity callback of #GNUNET_IDENTITY_connect (if
3319 * that one was not NULL).
3321 * @param cls closure, NULL
3322 * @param ego ego handle
3323 * @param ctx context for application to store data for this ego
3324 * (during the lifetime of this process, initially NULL)
3325 * @param name name assigned by the user for this ego,
3326 * NULL if the user just deleted the ego and it
3327 * must thus no longer be used
3330 identity_master_cb (void *cls,
3331 struct GNUNET_IDENTITY_Ego *ego,
3338 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3339 _("No ego configured for `%s`\n"),
3341 GNUNET_SCHEDULER_shutdown ();
3344 GNUNET_IDENTITY_ego_get_public_key (ego,
3351 * Main function that will be run
3353 * @param cls closure
3354 * @param args remaining command-line arguments
3355 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
3356 * @param c configuration
3361 const char *cfgfile,
3362 const struct GNUNET_CONFIGURATION_Handle *c)
3364 char* cafile_cfg = NULL;
3369 if (NULL == (curl_multi = curl_multi_init ()))
3371 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3372 "Failed to create cURL multi handle!\n");
3375 cafile = cafile_opt;
3378 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "gns-proxy",
3382 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
3387 cafile = cafile_cfg;
3389 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3390 "Using %s as CA\n", cafile);
3392 gnutls_global_init ();
3393 gnutls_x509_crt_init (&proxy_ca.cert);
3394 gnutls_x509_privkey_init (&proxy_ca.key);
3396 if ( (GNUNET_OK != load_cert_from_file (proxy_ca.cert, cafile)) ||
3397 (GNUNET_OK != load_key_from_file (proxy_ca.key, cafile)) )
3399 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3400 _("Failed to load SSL/TLS key and certificate from `%s'\n"),
3402 gnutls_x509_crt_deinit (proxy_ca.cert);
3403 gnutls_x509_privkey_deinit (proxy_ca.key);
3404 gnutls_global_deinit ();
3405 GNUNET_free_non_null (cafile_cfg);
3408 GNUNET_free_non_null (cafile_cfg);
3409 if (NULL == (gns_handle = GNUNET_GNS_connect (cfg)))
3411 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3412 "Unable to connect to GNS!\n");
3413 gnutls_x509_crt_deinit (proxy_ca.cert);
3414 gnutls_x509_privkey_deinit (proxy_ca.key);
3415 gnutls_global_deinit ();
3418 identity = GNUNET_IDENTITY_connect (cfg,
3420 id_op = GNUNET_IDENTITY_get (identity,
3422 &identity_master_cb,
3424 GNUNET_SCHEDULER_add_shutdown (&do_shutdown, NULL);
3429 * The main function for gnunet-gns-proxy.
3431 * @param argc number of arguments from the command line
3432 * @param argv command line arguments
3433 * @return 0 ok, 1 on error
3436 main (int argc, char *const *argv)
3438 struct GNUNET_GETOPT_CommandLineOption options[] = {
3440 GNUNET_GETOPT_option_ulong ('p',
3443 gettext_noop ("listen on specified port (default: 7777)"),
3446 GNUNET_GETOPT_option_string ('a',
3449 gettext_noop ("pem file to use as CA"),
3452 GNUNET_GETOPT_OPTION_END
3454 static const char* page =
3455 "<html><head><title>gnunet-gns-proxy</title>"
3456 "</head><body>cURL fail</body></html>";
3459 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv,
3462 GNUNET_log_setup ("gnunet-gns-proxy",
3465 curl_failure_response
3466 = MHD_create_response_from_buffer (strlen (page),
3468 MHD_RESPMEM_PERSISTENT);
3472 GNUNET_PROGRAM_run (argc, argv,
3474 _("GNUnet GNS proxy"),
3476 &run, NULL)) ? 0 : 1;
3477 MHD_destroy_response (curl_failure_response);
3478 GNUNET_free_non_null ((char *) argv);
3482 /* end of gnunet-gns-proxy.c */