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 CA for SSL certificate generation
700 static struct ProxyCA proxy_ca;
703 * Response we return on cURL failures.
705 static struct MHD_Response *curl_failure_response;
708 * Connection to identity service.
710 static struct GNUNET_IDENTITY_Handle *identity;
713 * Request for our ego.
715 static struct GNUNET_IDENTITY_Operation *id_op;
720 static const struct GNUNET_CONFIGURATION_Handle *cfg;
723 /* ************************* Global helpers ********************* */
727 * Run MHD now, we have extra data ready for the callback.
729 * @param hd the daemon to run now.
732 run_mhd_now (struct MhdHttpList *hd);
736 * Clean up s5r handles.
738 * @param s5r the handle to destroy
741 cleanup_s5r (struct Socks5Request *s5r)
743 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
744 "Cleaning up socks request\n");
745 if (NULL != s5r->curl)
747 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
748 "Cleaning up cURL handle\n");
749 curl_multi_remove_handle (curl_multi, s5r->curl);
750 curl_easy_cleanup (s5r->curl);
753 curl_slist_free_all (s5r->headers);
754 if (NULL != s5r->hosts)
756 curl_slist_free_all (s5r->hosts);
758 if ( (NULL != s5r->response) &&
759 (curl_failure_response != s5r->response) )
760 MHD_destroy_response (s5r->response);
761 if (NULL != s5r->rtask)
762 GNUNET_SCHEDULER_cancel (s5r->rtask);
763 if (NULL != s5r->timeout_task)
764 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
765 if (NULL != s5r->wtask)
766 GNUNET_SCHEDULER_cancel (s5r->wtask);
767 if (NULL != s5r->gns_lookup)
768 GNUNET_GNS_lookup_cancel (s5r->gns_lookup);
769 if (NULL != s5r->sock)
771 if (SOCKS5_SOCKET_WITH_MHD <= s5r->state)
772 GNUNET_NETWORK_socket_free_memory_only_ (s5r->sock);
774 GNUNET_NETWORK_socket_close (s5r->sock);
776 GNUNET_CONTAINER_DLL_remove (s5r_head,
779 GNUNET_free_non_null (s5r->domain);
780 GNUNET_free_non_null (s5r->leho);
781 GNUNET_free_non_null (s5r->url);
782 GNUNET_free_non_null (s5r->dane_data);
787 /* ************************* HTTP handling with cURL *********************** */
791 * Callback for MHD response generation. This function is called from
792 * MHD whenever MHD expects to get data back. Copies data from the
793 * io_buf, if available.
795 * @param cls closure with our `struct Socks5Request`
796 * @param pos in buffer
797 * @param buf where to copy data
798 * @param max available space in @a buf
799 * @return number of bytes written to @a buf
802 mhd_content_cb (void *cls,
807 struct Socks5Request *s5r = cls;
808 size_t bytes_to_copy;
810 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
811 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
813 /* we're still not done with the upload, do not yet
814 start the download, the IO buffer is still full
816 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
817 "Pausing MHD download, not yet ready for download\n");
818 return 0; /* not yet ready for data download */
820 bytes_to_copy = GNUNET_MIN (max,
822 if ( (0 == bytes_to_copy) &&
823 (SOCKS5_SOCKET_DOWNLOAD_DONE != s5r->state) )
825 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
826 "Pausing MHD download, no data available\n");
827 return 0; /* more data later */
829 if ( (0 == bytes_to_copy) &&
830 (SOCKS5_SOCKET_DOWNLOAD_DONE == s5r->state) )
832 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
833 "Completed MHD download\n");
834 return MHD_CONTENT_READER_END_OF_STREAM;
836 GNUNET_memcpy (buf, s5r->io_buf, bytes_to_copy);
837 memmove (s5r->io_buf,
838 &s5r->io_buf[bytes_to_copy],
839 s5r->io_len - bytes_to_copy);
840 s5r->io_len -= bytes_to_copy;
841 if (NULL != s5r->curl)
842 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
843 return bytes_to_copy;
848 * Check that the website has presented us with a valid SSL certificate.
849 * The certificate must either match the domain name or the LEHO name
850 * (or, if available, the TLSA record).
852 * @param s5r request to check for.
853 * @return #GNUNET_OK if the certificate is valid
856 check_ssl_certificate (struct Socks5Request *s5r)
858 unsigned int cert_list_size;
859 const gnutls_datum_t *chainp;
860 const struct curl_tlssessioninfo *tlsinfo;
861 char certdn[GNUNET_DNSPARSER_MAX_NAME_LENGTH + 3];
863 gnutls_x509_crt_t x509_cert;
867 s5r->ssl_checked = GNUNET_YES;
868 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "XXXXXX\n");
870 curl_easy_getinfo (s5r->curl,
871 CURLINFO_TLS_SESSION,
872 (struct curl_slist **) &tlsinfo))
873 return GNUNET_SYSERR;
874 if (CURLSSLBACKEND_GNUTLS != tlsinfo->backend)
876 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
877 _("Unsupported CURL SSL backend %d\n"),
879 return GNUNET_SYSERR;
881 chainp = gnutls_certificate_get_peers (tlsinfo->internals, &cert_list_size);
882 if ( (! chainp) || (0 == cert_list_size) )
883 return GNUNET_SYSERR;
885 size = sizeof (certdn);
886 /* initialize an X.509 certificate structure. */
887 gnutls_x509_crt_init (&x509_cert);
888 gnutls_x509_crt_import (x509_cert,
890 GNUTLS_X509_FMT_DER);
892 if (0 != (rc = gnutls_x509_crt_get_dn_by_oid (x509_cert,
893 GNUTLS_OID_X520_COMMON_NAME,
894 0, /* the first and only one */
895 0 /* no DER encoding */,
899 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
900 _("Failed to fetch CN from cert: %s\n"),
901 gnutls_strerror(rc));
902 gnutls_x509_crt_deinit (x509_cert);
903 return GNUNET_SYSERR;
905 /* check for TLSA/DANE records */
907 if (NULL != s5r->dane_data)
909 char *dd[] = { s5r->dane_data, NULL };
910 int dlen[] = { s5r->dane_data_len, 0};
911 dane_state_t dane_state;
912 dane_query_t dane_query;
915 /* FIXME: add flags to gnutls to NOT read UNBOUND_ROOT_KEY_FILE here! */
916 if (0 != (rc = dane_state_init (&dane_state,
917 #ifdef DANE_F_IGNORE_DNSSEC
918 DANE_F_IGNORE_DNSSEC |
920 DANE_F_IGNORE_LOCAL_RESOLVER)))
922 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
923 _("Failed to initialize DANE: %s\n"),
925 gnutls_x509_crt_deinit (x509_cert);
926 return GNUNET_SYSERR;
928 if (0 != (rc = dane_raw_tlsa (dane_state,
935 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
936 _("Failed to parse DANE record: %s\n"),
938 dane_state_deinit (dane_state);
939 gnutls_x509_crt_deinit (x509_cert);
940 return GNUNET_SYSERR;
942 if (0 != (rc = dane_verify_crt_raw (dane_state,
945 gnutls_certificate_type_get (tlsinfo->internals),
950 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
951 _("Failed to verify TLS connection using DANE: %s\n"),
953 dane_query_deinit (dane_query);
954 dane_state_deinit (dane_state);
955 gnutls_x509_crt_deinit (x509_cert);
956 return GNUNET_SYSERR;
960 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
961 _("Failed DANE verification failed with GnuTLS verify status code: %u\n"),
963 dane_query_deinit (dane_query);
964 dane_state_deinit (dane_state);
965 gnutls_x509_crt_deinit (x509_cert);
966 return GNUNET_SYSERR;
968 dane_query_deinit (dane_query);
969 dane_state_deinit (dane_state);
975 /* try LEHO or ordinary domain name X509 verification */
977 if (NULL != s5r->leho)
981 if (0 == (rc = gnutls_x509_crt_check_hostname (x509_cert,
984 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
985 _("SSL certificate subject name (%s) does not match `%s'\n"),
988 gnutls_x509_crt_deinit (x509_cert);
989 return GNUNET_SYSERR;
994 /* we did not even have the domain name!? */
996 return GNUNET_SYSERR;
999 gnutls_x509_crt_deinit (x509_cert);
1005 * We're getting an HTTP response header from cURL. Convert it to the
1006 * MHD response headers. Mostly copies the headers, but makes special
1007 * adjustments to "Set-Cookie" and "Location" headers as those may need
1008 * to be changed from the LEHO to the domain the browser expects.
1010 * @param buffer curl buffer with a single line of header data; not 0-terminated!
1011 * @param size curl blocksize
1012 * @param nmemb curl blocknumber
1013 * @param cls our `struct Socks5Request *`
1014 * @return size of processed bytes
1017 curl_check_hdr (void *buffer, size_t size, size_t nmemb, void *cls)
1019 struct Socks5Request *s5r = cls;
1020 struct HttpResponseHeader *header;
1021 size_t bytes = size * nmemb;
1023 const char *hdr_type;
1024 const char *cookie_domain;
1026 char *new_cookie_hdr;
1029 size_t delta_cdomain;
1033 /* first, check SSL certificate */
1034 if ((GNUNET_YES != s5r->ssl_checked) &&
1035 (HTTPS_PORT == s5r->port))
1037 if (GNUNET_OK != check_ssl_certificate (s5r))
1041 ndup = GNUNET_strndup (buffer, bytes);
1042 hdr_type = strtok (ndup, ":");
1043 if (NULL == hdr_type)
1048 hdr_val = strtok (NULL, "");
1049 if (NULL == hdr_val)
1054 if (' ' == *hdr_val)
1057 /* custom logic for certain header types */
1058 new_cookie_hdr = NULL;
1059 if ( (NULL != s5r->leho) &&
1060 (0 == strcasecmp (hdr_type,
1061 MHD_HTTP_HEADER_SET_COOKIE)) )
1064 new_cookie_hdr = GNUNET_malloc (strlen (hdr_val) +
1065 strlen (s5r->domain) + 1);
1067 domain_matched = GNUNET_NO; /* make sure we match domain at most once */
1068 for (tok = strtok (hdr_val, ";"); NULL != tok; tok = strtok (NULL, ";"))
1070 if ( (0 == strncasecmp (tok, " domain", strlen (" domain"))) &&
1071 (GNUNET_NO == domain_matched) )
1073 domain_matched = GNUNET_YES;
1074 cookie_domain = tok + strlen (" domain") + 1;
1075 if (strlen (cookie_domain) < strlen (s5r->leho))
1077 delta_cdomain = strlen (s5r->leho) - strlen (cookie_domain);
1078 if (0 == strcasecmp (cookie_domain, s5r->leho + delta_cdomain))
1080 offset += sprintf (new_cookie_hdr + offset,
1086 else if (0 == strcmp (cookie_domain, s5r->leho))
1088 offset += sprintf (new_cookie_hdr + offset,
1093 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1094 _("Cookie domain `%s' supplied by server is invalid\n"),
1097 GNUNET_memcpy (new_cookie_hdr + offset, tok, strlen (tok));
1098 offset += strlen (tok);
1099 new_cookie_hdr[offset++] = ';';
1101 hdr_val = new_cookie_hdr;
1104 new_location = NULL;
1105 if (0 == strcasecmp (MHD_HTTP_HEADER_LOCATION, hdr_type))
1109 GNUNET_asprintf (&leho_host,
1110 (HTTPS_PORT != s5r->port)
1114 if (0 == strncmp (leho_host,
1116 strlen (leho_host)))
1118 GNUNET_asprintf (&new_location,
1120 (HTTPS_PORT != s5r->port)
1124 hdr_val + strlen (leho_host));
1125 hdr_val = new_location;
1127 GNUNET_free (leho_host);
1129 /* MHD does not allow certain characters in values, remove those */
1130 if (NULL != (tok = strchr (hdr_val, '\n')))
1132 if (NULL != (tok = strchr (hdr_val, '\r')))
1134 if (NULL != (tok = strchr (hdr_val, '\t')))
1136 if (0 != strlen (hdr_val)) /* Rely in MHD to set those */
1138 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1139 "Adding header %s: %s to MHD response\n",
1142 header = GNUNET_new (struct HttpResponseHeader);
1143 header->type = GNUNET_strndup (hdr_type, strlen (hdr_type));
1144 header->value = GNUNET_strndup (hdr_val, strlen (hdr_val));
1145 GNUNET_CONTAINER_DLL_insert (s5r->header_head,
1150 GNUNET_free_non_null (new_cookie_hdr);
1151 GNUNET_free_non_null (new_location);
1156 create_mhd_response_from_s5r (struct Socks5Request *s5r)
1159 double content_length;
1160 struct HttpResponseHeader *header;
1162 if (NULL != s5r->response)
1164 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1165 "Response already set!\n");
1166 return GNUNET_SYSERR;
1169 GNUNET_break (CURLE_OK ==
1170 curl_easy_getinfo (s5r->curl,
1171 CURLINFO_RESPONSE_CODE,
1173 GNUNET_break (CURLE_OK ==
1174 curl_easy_getinfo (s5r->curl,
1175 CURLINFO_CONTENT_LENGTH_DOWNLOAD,
1177 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1178 "Creating MHD response with code %d and size %d\n",
1179 (int) resp_code, (int) content_length);
1180 s5r->response_code = resp_code;
1181 s5r->response = MHD_create_response_from_callback ((-1 == content_length) ? MHD_SIZE_UNKNOWN : content_length,
1186 for (header = s5r->header_head; NULL != header; header = header->next)
1188 GNUNET_break (MHD_YES ==
1189 MHD_add_response_header (s5r->response,
1194 if (NULL != s5r->leho)
1198 GNUNET_asprintf (&cors_hdr,
1199 (HTTPS_PORT == s5r->port)
1204 GNUNET_break (MHD_YES ==
1205 MHD_add_response_header (s5r->response,
1206 MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN,
1208 GNUNET_free (cors_hdr);
1210 /* force connection to be closed after each request, as we
1211 do not support HTTP pipelining (yet, FIXME!) */
1212 /*GNUNET_break (MHD_YES ==
1213 MHD_add_response_header (s5r->response,
1214 MHD_HTTP_HEADER_CONNECTION,
1220 * Handle response payload data from cURL. Copies it into our `io_buf` to make
1221 * it available to MHD.
1223 * @param ptr pointer to the data
1224 * @param size number of blocks of data
1225 * @param nmemb blocksize
1226 * @param ctx our `struct Socks5Request *`
1227 * @return number of bytes handled
1230 curl_download_cb (void *ptr, size_t size, size_t nmemb, void* ctx)
1232 struct Socks5Request *s5r = ctx;
1233 size_t total = size * nmemb;
1235 if (NULL == s5r->response)
1236 GNUNET_assert (GNUNET_OK == create_mhd_response_from_s5r (s5r));
1238 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
1239 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1241 /* we're still not done with the upload, do not yet
1242 start the download, the IO buffer is still full
1243 with upload data. */
1244 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1245 "Pausing CURL download, waiting for UPLOAD to finish\n");
1246 return CURL_WRITEFUNC_PAUSE; /* not yet ready for data download */
1248 if (sizeof (s5r->io_buf) - s5r->io_len < total)
1250 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1251 "Pausing CURL download, not enough space\n");
1252 return CURL_WRITEFUNC_PAUSE; /* not enough space */
1254 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
1257 s5r->io_len += total;
1258 if (s5r->io_len == total)
1259 run_mhd_now (s5r->hd);
1265 * cURL callback for uploaded (PUT/POST) data. Copies it into our `io_buf`
1266 * to make it available to MHD.
1268 * @param buf where to write the data
1269 * @param size number of bytes per member
1270 * @param nmemb number of members available in @a buf
1271 * @param cls our `struct Socks5Request` that generated the data
1272 * @return number of bytes copied to @a buf
1275 curl_upload_cb (void *buf, size_t size, size_t nmemb, void *cls)
1277 struct Socks5Request *s5r = cls;
1278 size_t len = size * nmemb;
1281 if ( (0 == s5r->io_len) &&
1282 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1284 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1285 "Pausing CURL UPLOAD, need more data\n");
1286 return CURL_READFUNC_PAUSE;
1288 if ( (0 == s5r->io_len) &&
1289 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1291 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1292 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1293 "Completed CURL UPLOAD\n");
1294 return 0; /* upload finished, can now download */
1296 if ( (SOCKS5_SOCKET_UPLOAD_STARTED != s5r->state) &&
1297 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1300 return CURL_READFUNC_ABORT;
1302 to_copy = GNUNET_MIN (s5r->io_len,
1304 GNUNET_memcpy (buf, s5r->io_buf, to_copy);
1305 memmove (s5r->io_buf,
1306 &s5r->io_buf[to_copy],
1307 s5r->io_len - to_copy);
1308 s5r->io_len -= to_copy;
1309 if (s5r->io_len + to_copy == sizeof (s5r->io_buf))
1310 run_mhd_now (s5r->hd); /* got more space for upload now */
1315 /* ************************** main loop of cURL interaction ****************** */
1319 * Task that is run when we are ready to receive more data
1322 * @param cls closure
1325 curl_task_download (void *cls);
1329 * Ask cURL for the select() sets and schedule cURL operations.
1332 curl_download_prepare ()
1339 struct GNUNET_NETWORK_FDSet *grs;
1340 struct GNUNET_NETWORK_FDSet *gws;
1342 struct GNUNET_TIME_Relative rtime;
1344 if (NULL != curl_download_task)
1346 GNUNET_SCHEDULER_cancel (curl_download_task);
1347 curl_download_task = NULL;
1353 if (CURLM_OK != (mret = curl_multi_fdset (curl_multi, &rs, &ws, &es, &max)))
1355 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1356 "%s failed at %s:%d: `%s'\n",
1357 "curl_multi_fdset", __FILE__, __LINE__,
1358 curl_multi_strerror (mret));
1362 GNUNET_break (CURLM_OK == curl_multi_timeout (curl_multi, &to));
1364 rtime = GNUNET_TIME_UNIT_FOREVER_REL;
1366 rtime = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, to);
1369 grs = GNUNET_NETWORK_fdset_create ();
1370 gws = GNUNET_NETWORK_fdset_create ();
1371 GNUNET_NETWORK_fdset_copy_native (grs, &rs, max + 1);
1372 GNUNET_NETWORK_fdset_copy_native (gws, &ws, max + 1);
1373 curl_download_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1376 &curl_task_download, curl_multi);
1377 GNUNET_NETWORK_fdset_destroy (gws);
1378 GNUNET_NETWORK_fdset_destroy (grs);
1382 curl_download_task = GNUNET_SCHEDULER_add_delayed (rtime,
1383 &curl_task_download,
1390 * Task that is run when we are ready to receive more data from curl.
1392 * @param cls closure, NULL
1395 curl_task_download (void *cls)
1399 struct CURLMsg *msg;
1401 struct Socks5Request *s5r;
1403 curl_download_task = NULL;
1407 mret = curl_multi_perform (curl_multi, &running);
1408 while (NULL != (msg = curl_multi_info_read (curl_multi, &msgnum)))
1410 GNUNET_break (CURLE_OK ==
1411 curl_easy_getinfo (msg->easy_handle,
1422 /* documentation says this is not used */
1426 switch (msg->data.result)
1429 case CURLE_GOT_NOTHING:
1430 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1431 "CURL download completed.\n");
1432 if (NULL == s5r->response)
1433 GNUNET_assert (GNUNET_OK == create_mhd_response_from_s5r (s5r));
1434 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1435 run_mhd_now (s5r->hd);
1438 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1439 "Download curl failed: %s\n",
1440 curl_easy_strerror (msg->data.result));
1441 /* FIXME: indicate error somehow? close MHD connection badly as well? */
1442 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1443 run_mhd_now (s5r->hd);
1446 if (NULL == s5r->response)
1447 s5r->response = curl_failure_response;
1450 /* documentation says this is not used */
1454 /* unexpected status code */
1459 } while (mret == CURLM_CALL_MULTI_PERFORM);
1460 if (CURLM_OK != mret)
1461 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1462 "%s failed at %s:%d: `%s'\n",
1463 "curl_multi_perform", __FILE__, __LINE__,
1464 curl_multi_strerror (mret));
1467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1468 "Suspending cURL multi loop, no more events pending\n");
1469 return; /* nothing more in progress */
1471 curl_download_prepare ();
1475 /* ********************************* MHD response generation ******************* */
1479 * Read HTTP request header field from the request. Copies the fields
1480 * over to the 'headers' that will be given to curl. However, 'Host'
1481 * is substituted with the LEHO if present. We also change the
1482 * 'Connection' header value to "close" as the proxy does not support
1485 * @param cls our `struct Socks5Request`
1486 * @param kind value kind
1487 * @param key field key
1488 * @param value field value
1489 * @return MHD_YES to continue to iterate
1492 con_val_iter (void *cls,
1493 enum MHD_ValueKind kind,
1497 struct Socks5Request *s5r = cls;
1500 if ( (0 == strcasecmp (MHD_HTTP_HEADER_HOST, key)) &&
1501 (NULL != s5r->leho) )
1503 if (0 == strcasecmp (MHD_HTTP_HEADER_CONTENT_LENGTH, key))
1505 if (0 == strcasecmp (MHD_HTTP_HEADER_ACCEPT_ENCODING, key))
1507 GNUNET_asprintf (&hdr,
1511 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1512 "Adding HEADER `%s' to HTTP request\n",
1514 s5r->headers = curl_slist_append (s5r->headers,
1522 * Main MHD callback for handling requests.
1525 * @param con MHD connection handle
1526 * @param url the url in the request
1527 * @param meth the HTTP method used ("GET", "PUT", etc.)
1528 * @param ver the HTTP version string (i.e. "HTTP/1.1")
1529 * @param upload_data the data being uploaded (excluding HEADERS,
1530 * for a POST that fits into memory and that is encoded
1531 * with a supported encoding, the POST data will NOT be
1532 * given in upload_data and is instead available as
1533 * part of MHD_get_connection_values; very large POST
1534 * data *will* be made available incrementally in
1536 * @param upload_data_size set initially to the size of the
1537 * @a upload_data provided; the method must update this
1538 * value to the number of bytes NOT processed;
1539 * @param con_cls pointer to location where we store the 'struct Request'
1540 * @return MHD_YES if the connection was handled successfully,
1541 * MHD_NO if the socket must be closed due to a serious
1542 * error while handling the request
1545 create_response (void *cls,
1546 struct MHD_Connection *con,
1550 const char *upload_data,
1551 size_t *upload_data_size,
1554 struct Socks5Request *s5r = *con_cls;
1557 char ipstring[INET6_ADDRSTRLEN];
1558 char ipaddr[INET6_ADDRSTRLEN + 2];
1559 const struct sockaddr *sa;
1560 const struct sockaddr_in *s4;
1561 const struct sockaddr_in6 *s6;
1571 if (SOCKS5_SOCKET_WITH_MHD == s5r->state)
1573 /* first time here, initialize curl handle */
1574 sa = (const struct sockaddr *) &s5r->destination_address;
1575 switch (sa->sa_family)
1578 s4 = (const struct sockaddr_in *) &s5r->destination_address;
1579 if (NULL == inet_ntop (AF_INET,
1587 GNUNET_snprintf (ipaddr,
1591 port = ntohs (s4->sin_port);
1594 s6 = (const struct sockaddr_in6 *) &s5r->destination_address;
1595 if (NULL == inet_ntop (AF_INET6,
1603 GNUNET_snprintf (ipaddr,
1607 port = ntohs (s6->sin6_port);
1613 if (NULL == s5r->curl)
1614 s5r->curl = curl_easy_init ();
1615 if (NULL == s5r->curl)
1616 return MHD_queue_response (con,
1617 MHD_HTTP_INTERNAL_SERVER_ERROR,
1618 curl_failure_response);
1619 curl_easy_setopt (s5r->curl, CURLOPT_HEADERFUNCTION, &curl_check_hdr);
1620 curl_easy_setopt (s5r->curl, CURLOPT_HEADERDATA, s5r);
1621 curl_easy_setopt (s5r->curl, CURLOPT_FOLLOWLOCATION, 0);
1622 curl_easy_setopt (s5r->curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
1623 curl_easy_setopt (s5r->curl, CURLOPT_CONNECTTIMEOUT, 600L);
1624 curl_easy_setopt (s5r->curl, CURLOPT_TIMEOUT, 600L);
1625 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1626 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_CONTENT_DECODING, 0);
1627 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_TRANSFER_DECODING, 0);
1628 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1629 curl_easy_setopt (s5r->curl, CURLOPT_PRIVATE, s5r);
1630 curl_easy_setopt (s5r->curl, CURLOPT_VERBOSE, 0);
1632 * Pre-populate cache to resolve Hostname.
1633 * This is necessary as the DNS name in the CURLOPT_URL is used
1634 * for SNI http://de.wikipedia.org/wiki/Server_Name_Indication
1636 if (NULL != s5r->leho)
1638 GNUNET_asprintf (&curl_hosts,
1643 s5r->hosts = curl_slist_append(NULL, curl_hosts);
1644 curl_easy_setopt(s5r->curl, CURLOPT_RESOLVE, s5r->hosts);
1645 GNUNET_free (curl_hosts);
1647 GNUNET_asprintf (&curlurl,
1648 (HTTPS_PORT != s5r->port)
1650 : "https://%s:%d%s",
1656 curl_easy_setopt (s5r->curl,
1659 GNUNET_free (curlurl);
1660 if (0 == strcasecmp (meth, MHD_HTTP_METHOD_PUT))
1662 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1663 curl_easy_setopt (s5r->curl, CURLOPT_UPLOAD, 1);
1664 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1665 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1666 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1667 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1669 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_POST))
1671 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1672 curl_easy_setopt (s5r->curl, CURLOPT_POST, 1L);
1673 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1674 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1675 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1676 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1678 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_HEAD))
1680 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1681 curl_easy_setopt (s5r->curl, CURLOPT_NOBODY, 1);
1683 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_OPTIONS))
1685 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1686 curl_easy_setopt (s5r->curl, CURLOPT_CUSTOMREQUEST, "OPTIONS");
1688 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_GET))
1690 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1691 curl_easy_setopt (s5r->curl, CURLOPT_HTTPGET, 1);
1692 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1693 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1697 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1698 _("Unsupported HTTP method `%s'\n"),
1700 curl_easy_cleanup (s5r->curl);
1705 if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_0))
1707 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
1709 else if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_1))
1711 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
1715 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_NONE);
1718 if (HTTPS_PORT == s5r->port)
1720 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);
1721 if (NULL != s5r->dane_data)
1722 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYPEER, 0L);
1724 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYPEER, 1L);
1725 /* Disable cURL checking the hostname, as we will check ourselves
1726 as only we have the domain name or the LEHO or the DANE record */
1727 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYHOST, 0L);
1731 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_NONE);
1734 if (CURLM_OK != curl_multi_add_handle (curl_multi, s5r->curl))
1737 curl_easy_cleanup (s5r->curl);
1741 MHD_get_connection_values (con,
1743 &con_val_iter, s5r);
1744 curl_easy_setopt (s5r->curl, CURLOPT_HTTPHEADER, s5r->headers);
1745 curl_download_prepare ();
1749 /* continuing to process request */
1750 if (0 != *upload_data_size)
1753 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1754 "Processing %u bytes UPLOAD\n",
1755 (unsigned int) *upload_data_size);
1757 /* FIXME: This must be set or a header with Transfer-Encoding: chunked. Else
1758 * upload callback is not called!
1760 curl_easy_setopt (s5r->curl, CURLOPT_POSTFIELDSIZE, *upload_data_size);
1762 left = GNUNET_MIN (*upload_data_size,
1763 sizeof (s5r->io_buf) - s5r->io_len);
1764 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
1767 s5r->io_len += left;
1768 *upload_data_size -= left;
1769 GNUNET_assert (NULL != s5r->curl);
1770 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
1773 if (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state)
1775 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1776 "Finished processing UPLOAD\n");
1777 s5r->state = SOCKS5_SOCKET_UPLOAD_DONE;
1779 if (NULL == s5r->response)
1781 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1782 "Queueing response with MHD\n");
1783 run_mhd_now (s5r->hd);
1784 return MHD_queue_response (con,
1790 /* ******************** MHD HTTP setup and event loop ******************** */
1794 * Function called when MHD decides that we are done with a request.
1797 * @param connection connection handle
1798 * @param con_cls value as set by the last call to
1799 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
1800 * @param toe reason for request termination (ignored)
1803 mhd_completed_cb (void *cls,
1804 struct MHD_Connection *connection,
1806 enum MHD_RequestTerminationCode toe)
1808 struct Socks5Request *s5r = *con_cls;
1809 struct HttpResponseHeader *header;
1813 if (MHD_REQUEST_TERMINATED_COMPLETED_OK != toe)
1814 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1815 "MHD encountered error handling request: %d\n",
1817 if (NULL != s5r->curl)
1819 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1820 "Resetting cURL handle\n");
1821 curl_multi_remove_handle (curl_multi, s5r->curl);
1822 curl_slist_free_all (s5r->headers);
1823 s5r->headers = NULL;
1824 curl_easy_reset (s5r->curl);
1829 if ( (NULL != s5r->response) &&
1830 (curl_failure_response != s5r->response) )
1831 MHD_destroy_response (s5r->response);
1832 for (header = s5r->header_head; header != NULL; header = s5r->header_head)
1834 GNUNET_CONTAINER_DLL_remove (s5r->header_head,
1837 GNUNET_free (header->type);
1838 GNUNET_free (header->value);
1839 GNUNET_free (header);
1841 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Finished request for %s\n", s5r->url);
1842 GNUNET_free (s5r->url);
1843 s5r->state = SOCKS5_SOCKET_WITH_MHD;
1845 s5r->response = NULL;
1851 * Function called when MHD connection is opened or closed.
1854 * @param connection connection handle
1855 * @param con_cls value as set by the last call to
1856 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
1857 * @param toe connection notification type
1860 mhd_connection_cb (void *cls,
1861 struct MHD_Connection *connection,
1863 enum MHD_ConnectionNotificationCode cnc)
1865 struct Socks5Request *s5r;
1866 const union MHD_ConnectionInfo *ci;
1871 case MHD_CONNECTION_NOTIFY_STARTED:
1872 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection started...\n");
1873 ci = MHD_get_connection_info (connection,
1874 MHD_CONNECTION_INFO_CONNECTION_FD);
1880 sock = ci->connect_fd;
1881 for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
1883 if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
1885 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Context set...\n");
1890 s5r->ssl_checked = GNUNET_NO;
1892 case MHD_CONNECTION_NOTIFY_CLOSED:
1893 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection closed... cleaning up\n");
1897 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Connection stale!\n");
1901 curl_download_prepare ();
1910 * Function called when MHD first processes an incoming connection.
1911 * Gives us the respective URI information.
1913 * We use this to associate the `struct MHD_Connection` with our
1914 * internal `struct Socks5Request` data structure (by checking
1915 * for matching sockets).
1917 * @param cls the HTTP server handle (a `struct MhdHttpList`)
1918 * @param url the URL that is being requested
1919 * @param connection MHD connection object for the request
1920 * @return the `struct Socks5Request` that this @a connection is for
1923 mhd_log_callback (void *cls,
1925 struct MHD_Connection *connection)
1927 struct Socks5Request *s5r;
1928 const union MHD_ConnectionInfo *ci;
1930 ci = MHD_get_connection_info (connection,
1931 MHD_CONNECTION_INFO_SOCKET_CONTEXT);
1932 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Processing %s\n", url);
1938 s5r = ci->socket_context;
1939 if (NULL != s5r->url)
1944 s5r->url = GNUNET_strdup (url);
1945 if (NULL != s5r->timeout_task)
1946 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
1947 s5r->timeout_task = NULL;
1948 GNUNET_assert (s5r->state == SOCKS5_SOCKET_WITH_MHD);
1954 * Kill the given MHD daemon.
1956 * @param hd daemon to stop
1959 kill_httpd (struct MhdHttpList *hd)
1961 GNUNET_CONTAINER_DLL_remove (mhd_httpd_head,
1964 GNUNET_free_non_null (hd->domain);
1965 MHD_stop_daemon (hd->daemon);
1966 if (NULL != hd->httpd_task)
1968 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1969 hd->httpd_task = NULL;
1971 GNUNET_free_non_null (hd->proxy_cert);
1979 * Task run whenever HTTP server is idle for too long. Kill it.
1981 * @param cls the `struct MhdHttpList *`
1984 kill_httpd_task (void *cls)
1986 struct MhdHttpList *hd = cls;
1988 hd->httpd_task = NULL;
1994 * Task run whenever HTTP server operations are pending.
1996 * @param cls the `struct MhdHttpList *` of the daemon that is being run
1999 do_httpd (void *cls);
2003 * Schedule MHD. This function should be called initially when an
2004 * MHD is first getting its client socket, and will then automatically
2005 * always be called later whenever there is work to be done.
2007 * @param hd the daemon to schedule
2010 schedule_httpd (struct MhdHttpList *hd)
2015 struct GNUNET_NETWORK_FDSet *wrs;
2016 struct GNUNET_NETWORK_FDSet *wws;
2019 MHD_UNSIGNED_LONG_LONG timeout;
2020 struct GNUNET_TIME_Relative tv;
2026 if (MHD_YES != MHD_get_fdset (hd->daemon, &rs, &ws, &es, &max))
2031 haveto = MHD_get_timeout (hd->daemon, &timeout);
2032 if (MHD_YES == haveto)
2033 tv.rel_value_us = (uint64_t) timeout * 1000LL;
2035 tv = GNUNET_TIME_UNIT_FOREVER_REL;
2038 wrs = GNUNET_NETWORK_fdset_create ();
2039 wws = GNUNET_NETWORK_fdset_create ();
2040 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
2041 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
2048 if (NULL != hd->httpd_task)
2049 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2050 if ( (MHD_YES != haveto) &&
2054 /* daemon is idle, kill after timeout */
2055 hd->httpd_task = GNUNET_SCHEDULER_add_delayed (MHD_CACHE_TIMEOUT,
2062 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2067 GNUNET_NETWORK_fdset_destroy (wrs);
2069 GNUNET_NETWORK_fdset_destroy (wws);
2074 * Task run whenever HTTP server operations are pending.
2076 * @param cls the `struct MhdHttpList` of the daemon that is being run
2079 do_httpd (void *cls)
2081 struct MhdHttpList *hd = cls;
2083 hd->httpd_task = NULL;
2084 MHD_run (hd->daemon);
2085 schedule_httpd (hd);
2090 * Run MHD now, we have extra data ready for the callback.
2092 * @param hd the daemon to run now.
2095 run_mhd_now (struct MhdHttpList *hd)
2099 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2100 hd->httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd,
2106 * Read file in filename
2108 * @param filename file to read
2109 * @param size pointer where filesize is stored
2110 * @return NULL on error
2113 load_file (const char* filename,
2120 GNUNET_DISK_file_size (filename, &fsize,
2121 GNUNET_YES, GNUNET_YES))
2123 if (fsize > MAX_PEM_SIZE)
2125 *size = (unsigned int) fsize;
2126 buffer = GNUNET_malloc (*size);
2127 if (fsize != GNUNET_DISK_fn_read (filename, buffer, (size_t) fsize))
2129 GNUNET_free (buffer);
2137 * Load PEM key from file
2139 * @param key where to store the data
2140 * @param keyfile path to the PEM file
2141 * @return #GNUNET_OK on success
2144 load_key_from_file (gnutls_x509_privkey_t key,
2145 const char* keyfile)
2147 gnutls_datum_t key_data;
2150 key_data.data = load_file (keyfile, &key_data.size);
2151 if (NULL == key_data.data)
2152 return GNUNET_SYSERR;
2153 ret = gnutls_x509_privkey_import (key, &key_data,
2154 GNUTLS_X509_FMT_PEM);
2155 if (GNUTLS_E_SUCCESS != ret)
2157 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2158 _("Unable to import private key from file `%s'\n"),
2161 GNUNET_free_non_null (key_data.data);
2162 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2167 * Load cert from file
2169 * @param crt struct to store data in
2170 * @param certfile path to pem file
2171 * @return #GNUNET_OK on success
2174 load_cert_from_file (gnutls_x509_crt_t crt,
2175 const char* certfile)
2177 gnutls_datum_t cert_data;
2180 cert_data.data = load_file (certfile, &cert_data.size);
2181 if (NULL == cert_data.data)
2182 return GNUNET_SYSERR;
2183 ret = gnutls_x509_crt_import (crt, &cert_data,
2184 GNUTLS_X509_FMT_PEM);
2185 if (GNUTLS_E_SUCCESS != ret)
2187 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2188 _("Unable to import certificate %s\n"), certfile);
2190 GNUNET_free_non_null (cert_data.data);
2191 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2196 * Generate new certificate for specific name
2198 * @param name the subject name to generate a cert for
2199 * @return a struct holding the PEM data, NULL on error
2201 static struct ProxyGNSCertificate *
2202 generate_gns_certificate (const char *name)
2204 unsigned int serial;
2205 size_t key_buf_size;
2206 size_t cert_buf_size;
2207 gnutls_x509_crt_t request;
2210 struct ProxyGNSCertificate *pgc;
2212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2213 "Generating TLS/SSL certificate for `%s'\n",
2215 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_init (&request));
2216 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_key (request, proxy_ca.key));
2217 pgc = GNUNET_new (struct ProxyGNSCertificate);
2218 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COUNTRY_NAME,
2220 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_ORGANIZATION_NAME,
2221 0, "GNU Name System", 4);
2222 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COMMON_NAME,
2223 0, name, strlen (name));
2224 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_version (request, 3));
2225 gnutls_rnd (GNUTLS_RND_NONCE, &serial, sizeof (serial));
2226 gnutls_x509_crt_set_serial (request,
2229 etime = time (NULL);
2230 tm_data = localtime (&etime);
2231 gnutls_x509_crt_set_activation_time (request,
2234 etime = mktime (tm_data);
2235 gnutls_x509_crt_set_expiration_time (request,
2237 gnutls_x509_crt_sign (request,
2240 key_buf_size = sizeof (pgc->key);
2241 cert_buf_size = sizeof (pgc->cert);
2242 gnutls_x509_crt_export (request, GNUTLS_X509_FMT_PEM,
2243 pgc->cert, &cert_buf_size);
2244 gnutls_x509_privkey_export (proxy_ca.key, GNUTLS_X509_FMT_PEM,
2245 pgc->key, &key_buf_size);
2246 gnutls_x509_crt_deinit (request);
2252 * Function called by MHD with errors, suppresses them all.
2254 * @param cls closure
2255 * @param fm format string (`printf()`-style)
2256 * @param ap arguments to @a fm
2259 mhd_error_log_callback (void *cls,
2268 * Lookup (or create) an SSL MHD instance for a particular domain.
2270 * @param domain the domain the SSL daemon has to serve
2271 * @return NULL on error
2273 static struct MhdHttpList *
2274 lookup_ssl_httpd (const char* domain)
2276 struct MhdHttpList *hd;
2277 struct ProxyGNSCertificate *pgc;
2284 for (hd = mhd_httpd_head; NULL != hd; hd = hd->next)
2285 if ( (NULL != hd->domain) &&
2286 (0 == strcmp (hd->domain, domain)) )
2288 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2289 "Starting fresh MHD HTTPS instance for domain `%s'\n",
2291 pgc = generate_gns_certificate (domain);
2292 hd = GNUNET_new (struct MhdHttpList);
2293 hd->is_ssl = GNUNET_YES;
2294 hd->domain = GNUNET_strdup (domain);
2295 hd->proxy_cert = pgc;
2296 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_SSL | MHD_USE_NO_LISTEN_SOCKET,
2299 &create_response, hd,
2300 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
2301 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
2302 MHD_OPTION_NOTIFY_CONNECTION, &mhd_connection_cb, NULL,
2303 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
2304 MHD_OPTION_EXTERNAL_LOGGER, &mhd_error_log_callback, NULL,
2305 MHD_OPTION_HTTPS_MEM_KEY, pgc->key,
2306 MHD_OPTION_HTTPS_MEM_CERT, pgc->cert,
2308 if (NULL == hd->daemon)
2314 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
2322 * Task run when a Socks5Request somehow fails to be associated with
2323 * an MHD connection (i.e. because the client never speaks HTTP after
2324 * the SOCKS5 handshake). Clean up.
2326 * @param cls the `struct Socks5Request *`
2329 timeout_s5r_handshake (void *cls)
2331 struct Socks5Request *s5r = cls;
2333 s5r->timeout_task = NULL;
2339 * We're done with the Socks5 protocol, now we need to pass the
2340 * connection data through to the final destination, either
2341 * direct (if the protocol might not be HTTP), or via MHD
2342 * (if the port looks like it should be HTTP).
2344 * @param s5r socks request that has reached the final stage
2347 setup_data_transfer (struct Socks5Request *s5r)
2349 struct MhdHttpList *hd;
2351 const struct sockaddr *addr;
2357 hd = lookup_ssl_httpd (s5r->domain);
2360 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2361 _("Failed to start HTTPS server for `%s'\n"),
2369 GNUNET_assert (NULL != httpd);
2373 fd = GNUNET_NETWORK_get_fd (s5r->sock);
2374 addr = GNUNET_NETWORK_get_addr (s5r->sock);
2375 len = GNUNET_NETWORK_get_addrlen (s5r->sock);
2376 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2377 if (MHD_YES != MHD_add_connection (hd->daemon, fd, addr, len))
2379 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2380 _("Failed to pass client to MHD\n"));
2385 schedule_httpd (hd);
2386 s5r->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_HANDSHAKE_TIMEOUT,
2387 &timeout_s5r_handshake,
2392 /* ********************* SOCKS handling ************************* */
2396 * Write data from buffer to socks5 client, then continue with state machine.
2398 * @param cls the closure with the `struct Socks5Request`
2401 do_write (void *cls)
2403 struct Socks5Request *s5r = cls;
2407 len = GNUNET_NETWORK_socket_send (s5r->sock,
2412 /* write error: connection closed, shutdown, etc.; just clean up */
2418 s5r->wbuf_len - len);
2419 s5r->wbuf_len -= len;
2420 if (s5r->wbuf_len > 0)
2422 /* not done writing */
2424 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2430 /* we're done writing, continue with state machine! */
2437 case SOCKS5_REQUEST:
2438 GNUNET_assert (NULL != s5r->rtask);
2440 case SOCKS5_DATA_TRANSFER:
2441 setup_data_transfer (s5r);
2443 case SOCKS5_WRITE_THEN_CLEANUP:
2454 * Return a server response message indicating a failure to the client.
2456 * @param s5r request to return failure code for
2457 * @param sc status code to return
2460 signal_socks_failure (struct Socks5Request *s5r,
2461 enum Socks5StatusCode sc)
2463 struct Socks5ServerResponseMessage *s_resp;
2465 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2466 memset (s_resp, 0, sizeof (struct Socks5ServerResponseMessage));
2467 s_resp->version = SOCKS_VERSION_5;
2469 s5r->state = SOCKS5_WRITE_THEN_CLEANUP;
2470 if (NULL != s5r->wtask)
2472 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2479 * Return a server response message indicating success.
2481 * @param s5r request to return success status message for
2484 signal_socks_success (struct Socks5Request *s5r)
2486 struct Socks5ServerResponseMessage *s_resp;
2488 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2489 s_resp->version = SOCKS_VERSION_5;
2490 s_resp->reply = SOCKS5_STATUS_REQUEST_GRANTED;
2491 s_resp->reserved = 0;
2492 s_resp->addr_type = SOCKS5_AT_IPV4;
2493 /* zero out IPv4 address and port */
2496 sizeof (struct in_addr) + sizeof (uint16_t));
2497 s5r->wbuf_len += sizeof (struct Socks5ServerResponseMessage) +
2498 sizeof (struct in_addr) + sizeof (uint16_t);
2499 if (NULL == s5r->wtask)
2501 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2508 * Process GNS results for target domain.
2510 * @param cls the `struct Socks5Request *`
2511 * @param rd_count number of records returned
2512 * @param rd record data
2515 handle_gns_result (void *cls,
2517 const struct GNUNET_GNSRECORD_Data *rd)
2519 struct Socks5Request *s5r = cls;
2521 const struct GNUNET_GNSRECORD_Data *r;
2524 s5r->gns_lookup = NULL;
2526 for (i=0;i<rd_count;i++)
2529 switch (r->record_type)
2531 case GNUNET_DNSPARSER_TYPE_A:
2533 struct sockaddr_in *in;
2535 if (sizeof (struct in_addr) != r->data_size)
2537 GNUNET_break_op (0);
2540 if (GNUNET_YES == got_ip)
2543 GNUNET_NETWORK_test_pf (PF_INET))
2545 got_ip = GNUNET_YES;
2546 in = (struct sockaddr_in *) &s5r->destination_address;
2547 in->sin_family = AF_INET;
2548 GNUNET_memcpy (&in->sin_addr,
2551 in->sin_port = htons (s5r->port);
2552 #if HAVE_SOCKADDR_IN_SIN_LEN
2553 in->sin_len = sizeof (*in);
2557 case GNUNET_DNSPARSER_TYPE_AAAA:
2559 struct sockaddr_in6 *in;
2561 if (sizeof (struct in6_addr) != r->data_size)
2563 GNUNET_break_op (0);
2566 if (GNUNET_YES == got_ip)
2569 GNUNET_NETWORK_test_pf (PF_INET))
2571 /* FIXME: allow user to disable IPv6 per configuration option... */
2572 got_ip = GNUNET_YES;
2573 in = (struct sockaddr_in6 *) &s5r->destination_address;
2574 in->sin6_family = AF_INET6;
2575 GNUNET_memcpy (&in->sin6_addr,
2578 in->sin6_port = htons (s5r->port);
2579 #if HAVE_SOCKADDR_IN_SIN_LEN
2580 in->sin6_len = sizeof (*in);
2584 case GNUNET_GNSRECORD_TYPE_VPN:
2585 GNUNET_break (0); /* should have been translated within GNS */
2587 case GNUNET_GNSRECORD_TYPE_LEHO:
2588 GNUNET_free_non_null (s5r->leho);
2589 s5r->leho = GNUNET_strndup (r->data,
2592 case GNUNET_GNSRECORD_TYPE_BOX:
2594 const struct GNUNET_GNSRECORD_BoxRecord *box;
2596 if (r->data_size < sizeof (struct GNUNET_GNSRECORD_BoxRecord))
2598 GNUNET_break_op (0);
2602 if ( (ntohl (box->record_type) != GNUNET_DNSPARSER_TYPE_TLSA) ||
2603 (ntohs (box->protocol) != IPPROTO_TCP) ||
2604 (ntohs (box->service) != s5r->port) )
2605 break; /* BOX record does not apply */
2606 GNUNET_free_non_null (s5r->dane_data);
2607 s5r->dane_data_len = r->data_size - sizeof (struct GNUNET_GNSRECORD_BoxRecord);
2608 s5r->dane_data = GNUNET_malloc (s5r->dane_data_len);
2609 GNUNET_memcpy (s5r->dane_data,
2611 s5r->dane_data_len);
2619 if (GNUNET_YES != got_ip)
2621 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2622 "Name resolution failed to yield useful IP address.\n");
2623 signal_socks_failure (s5r,
2624 SOCKS5_STATUS_GENERAL_FAILURE);
2627 s5r->state = SOCKS5_DATA_TRANSFER;
2628 signal_socks_success (s5r);
2633 * Remove the first @a len bytes from the beginning of the read buffer.
2635 * @param s5r the handle clear the read buffer for
2636 * @param len number of bytes in read buffer to advance
2639 clear_from_s5r_rbuf (struct Socks5Request *s5r,
2642 GNUNET_assert (len <= s5r->rbuf_len);
2645 s5r->rbuf_len - len);
2646 s5r->rbuf_len -= len;
2651 * Read data from incoming Socks5 connection
2653 * @param cls the closure with the `struct Socks5Request`
2656 do_s5r_read (void *cls)
2658 struct Socks5Request *s5r = cls;
2659 const struct Socks5ClientHelloMessage *c_hello;
2660 struct Socks5ServerHelloMessage *s_hello;
2661 const struct Socks5ClientRequestMessage *c_req;
2664 const struct GNUNET_SCHEDULER_TaskContext *tc;
2667 tc = GNUNET_SCHEDULER_get_task_context ();
2668 if ( (NULL != tc->read_ready) &&
2669 (GNUNET_NETWORK_fdset_isset (tc->read_ready, s5r->sock)) )
2671 rlen = GNUNET_NETWORK_socket_recv (s5r->sock,
2672 &s5r->rbuf[s5r->rbuf_len],
2673 sizeof (s5r->rbuf) - s5r->rbuf_len);
2676 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2677 "socks5 client disconnected.\n");
2681 s5r->rbuf_len += rlen;
2683 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2686 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2687 "Processing %zu bytes of socks data in state %d\n",
2693 c_hello = (const struct Socks5ClientHelloMessage*) &s5r->rbuf;
2694 if ( (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage)) ||
2695 (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods) )
2696 return; /* need more data */
2697 if (SOCKS_VERSION_5 != c_hello->version)
2699 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2700 _("Unsupported socks version %d\n"),
2701 (int) c_hello->version);
2705 clear_from_s5r_rbuf (s5r,
2706 sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods);
2707 GNUNET_assert (0 == s5r->wbuf_len);
2708 s_hello = (struct Socks5ServerHelloMessage *) &s5r->wbuf;
2709 s5r->wbuf_len = sizeof (struct Socks5ServerHelloMessage);
2710 s_hello->version = SOCKS_VERSION_5;
2711 s_hello->auth_method = SOCKS_AUTH_NONE;
2712 GNUNET_assert (NULL == s5r->wtask);
2713 s5r->wtask = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2716 s5r->state = SOCKS5_REQUEST;
2718 case SOCKS5_REQUEST:
2719 c_req = (const struct Socks5ClientRequestMessage *) &s5r->rbuf;
2720 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage))
2722 switch (c_req->command)
2724 case SOCKS5_CMD_TCP_STREAM:
2728 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2729 _("Unsupported socks command %d\n"),
2730 (int) c_req->command);
2731 signal_socks_failure (s5r,
2732 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED);
2735 switch (c_req->addr_type)
2737 case SOCKS5_AT_IPV4:
2739 const struct in_addr *v4 = (const struct in_addr *) &c_req[1];
2740 const uint16_t *port = (const uint16_t *) &v4[1];
2741 struct sockaddr_in *in;
2743 s5r->port = ntohs (*port);
2744 if (HTTPS_PORT == s5r->port)
2746 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2747 _("SSL connection to plain IPv4 address requested\n"));
2748 signal_socks_failure (s5r,
2749 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE);
2752 alen = sizeof (struct in_addr);
2753 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2754 alen + sizeof (uint16_t))
2755 return; /* need more data */
2756 in = (struct sockaddr_in *) &s5r->destination_address;
2757 in->sin_family = AF_INET;
2759 in->sin_port = *port;
2760 #if HAVE_SOCKADDR_IN_SIN_LEN
2761 in->sin_len = sizeof (*in);
2763 s5r->state = SOCKS5_DATA_TRANSFER;
2766 case SOCKS5_AT_IPV6:
2768 const struct in6_addr *v6 = (const struct in6_addr *) &c_req[1];
2769 const uint16_t *port = (const uint16_t *) &v6[1];
2770 struct sockaddr_in6 *in;
2772 s5r->port = ntohs (*port);
2773 if (HTTPS_PORT == s5r->port)
2775 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2776 _("SSL connection to plain IPv4 address requested\n"));
2777 signal_socks_failure (s5r,
2778 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE);
2781 alen = sizeof (struct in6_addr);
2782 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2783 alen + sizeof (uint16_t))
2784 return; /* need more data */
2785 in = (struct sockaddr_in6 *) &s5r->destination_address;
2786 in->sin6_family = AF_INET6;
2787 in->sin6_addr = *v6;
2788 in->sin6_port = *port;
2789 #if HAVE_SOCKADDR_IN_SIN_LEN
2790 in->sin6_len = sizeof (*in);
2792 s5r->state = SOCKS5_DATA_TRANSFER;
2795 case SOCKS5_AT_DOMAINNAME:
2797 const uint8_t *dom_len;
2798 const char *dom_name;
2799 const uint16_t *port;
2801 dom_len = (const uint8_t *) &c_req[1];
2802 alen = *dom_len + 1;
2803 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2804 alen + sizeof (uint16_t))
2805 return; /* need more data */
2806 dom_name = (const char *) &dom_len[1];
2807 port = (const uint16_t*) &dom_name[*dom_len];
2808 s5r->domain = GNUNET_strndup (dom_name, *dom_len);
2809 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2810 "Requested connection is to %s:%d\n",
2813 s5r->state = SOCKS5_RESOLVING;
2814 s5r->port = ntohs (*port);
2815 s5r->gns_lookup = GNUNET_GNS_lookup (gns_handle,
2818 GNUNET_DNSPARSER_TYPE_A,
2819 GNUNET_NO /* only cached */,
2825 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2826 _("Unsupported socks address type %d\n"),
2827 (int) c_req->addr_type);
2828 signal_socks_failure (s5r,
2829 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED);
2832 clear_from_s5r_rbuf (s5r,
2833 sizeof (struct Socks5ClientRequestMessage) +
2834 alen + sizeof (uint16_t));
2835 if (0 != s5r->rbuf_len)
2837 /* read more bytes than healthy, why did the client send more!? */
2838 GNUNET_break_op (0);
2839 signal_socks_failure (s5r,
2840 SOCKS5_STATUS_GENERAL_FAILURE);
2843 if (SOCKS5_DATA_TRANSFER == s5r->state)
2845 /* if we are not waiting for GNS resolution, signal success */
2846 signal_socks_success (s5r);
2848 /* We are done reading right now */
2849 GNUNET_SCHEDULER_cancel (s5r->rtask);
2852 case SOCKS5_RESOLVING:
2855 case SOCKS5_DATA_TRANSFER:
2866 * Accept new incoming connections
2868 * @param cls the closure with the lsock4 or lsock6
2869 * @param tc the scheduler context
2872 do_accept (void *cls)
2874 struct GNUNET_NETWORK_Handle *lsock = cls;
2875 struct GNUNET_NETWORK_Handle *s;
2876 struct Socks5Request *s5r;
2878 if (lsock == lsock4)
2882 if (lsock == lsock4)
2883 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2887 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2890 s = GNUNET_NETWORK_socket_accept (lsock, NULL, NULL);
2893 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "accept");
2896 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2897 "Got an inbound connection, waiting for data\n");
2898 s5r = GNUNET_new (struct Socks5Request);
2899 GNUNET_CONTAINER_DLL_insert (s5r_head,
2903 s5r->state = SOCKS5_INIT;
2904 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2910 /* ******************* General / main code ********************* */
2914 * Task run on shutdown
2916 * @param cls closure
2919 do_shutdown (void *cls)
2921 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2922 "Shutting down...\n");
2923 while (NULL != mhd_httpd_head)
2924 kill_httpd (mhd_httpd_head);
2925 while (NULL != s5r_head)
2926 cleanup_s5r (s5r_head);
2929 GNUNET_NETWORK_socket_close (lsock4);
2934 GNUNET_NETWORK_socket_close (lsock6);
2939 GNUNET_IDENTITY_cancel (id_op);
2942 if (NULL != identity)
2944 GNUNET_IDENTITY_disconnect (identity);
2947 if (NULL != curl_multi)
2949 curl_multi_cleanup (curl_multi);
2952 if (NULL != gns_handle)
2954 GNUNET_GNS_disconnect (gns_handle);
2957 if (NULL != curl_download_task)
2959 GNUNET_SCHEDULER_cancel (curl_download_task);
2960 curl_download_task = NULL;
2964 GNUNET_SCHEDULER_cancel (ltask4);
2969 GNUNET_SCHEDULER_cancel (ltask6);
2972 gnutls_x509_crt_deinit (proxy_ca.cert);
2973 gnutls_x509_privkey_deinit (proxy_ca.key);
2974 gnutls_global_deinit ();
2979 * Create an IPv4 listen socket bound to our port.
2981 * @return NULL on error
2983 static struct GNUNET_NETWORK_Handle *
2986 struct GNUNET_NETWORK_Handle *ls;
2987 struct sockaddr_in sa4;
2990 memset (&sa4, 0, sizeof (sa4));
2991 sa4.sin_family = AF_INET;
2992 sa4.sin_port = htons (port);
2993 #if HAVE_SOCKADDR_IN_SIN_LEN
2994 sa4.sin_len = sizeof (sa4);
2996 ls = GNUNET_NETWORK_socket_create (AF_INET,
3002 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa4,
3006 GNUNET_NETWORK_socket_close (ls);
3015 * Create an IPv6 listen socket bound to our port.
3017 * @return NULL on error
3019 static struct GNUNET_NETWORK_Handle *
3022 struct GNUNET_NETWORK_Handle *ls;
3023 struct sockaddr_in6 sa6;
3026 memset (&sa6, 0, sizeof (sa6));
3027 sa6.sin6_family = AF_INET6;
3028 sa6.sin6_port = htons (port);
3029 #if HAVE_SOCKADDR_IN_SIN_LEN
3030 sa6.sin6_len = sizeof (sa6);
3032 ls = GNUNET_NETWORK_socket_create (AF_INET6,
3038 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa6,
3042 GNUNET_NETWORK_socket_close (ls);
3051 * Continue initialization after we have our zone information.
3056 struct MhdHttpList *hd;
3058 /* Open listen socket for socks proxy */
3059 lsock6 = bind_v6 ();
3061 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
3064 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock6, 5))
3066 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
3067 GNUNET_NETWORK_socket_close (lsock6);
3072 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3073 lsock6, &do_accept, lsock6);
3076 lsock4 = bind_v4 ();
3078 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
3081 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock4, 5))
3083 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
3084 GNUNET_NETWORK_socket_close (lsock4);
3089 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3090 lsock4, &do_accept, lsock4);
3093 if ( (NULL == lsock4) &&
3096 GNUNET_SCHEDULER_shutdown ();
3099 if (0 != curl_global_init (CURL_GLOBAL_WIN32))
3101 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3102 "cURL global init failed!\n");
3103 GNUNET_SCHEDULER_shutdown ();
3106 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3107 "Proxy listens on port %lu\n",
3110 /* start MHD daemon for HTTP */
3111 hd = GNUNET_new (struct MhdHttpList);
3112 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_NO_LISTEN_SOCKET,
3115 &create_response, hd,
3116 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
3117 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
3118 MHD_OPTION_NOTIFY_CONNECTION, &mhd_connection_cb, NULL,
3119 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
3121 if (NULL == hd->daemon)
3124 GNUNET_SCHEDULER_shutdown ();
3128 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head, mhd_httpd_tail, hd);
3133 * Method called to inform about the egos of the master zone of this peer.
3135 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
3136 * this function is only called ONCE, and 'NULL' being passed in
3137 * @a ego does indicate an error (i.e. name is taken or no default
3138 * value is known). If @a ego is non-NULL and if '*ctx'
3139 * is set in those callbacks, the value WILL be passed to a subsequent
3140 * call to the identity callback of #GNUNET_IDENTITY_connect (if
3141 * that one was not NULL).
3143 * @param cls closure, NULL
3144 * @param ego ego handle
3145 * @param ctx context for application to store data for this ego
3146 * (during the lifetime of this process, initially NULL)
3147 * @param name name assigned by the user for this ego,
3148 * NULL if the user just deleted the ego and it
3149 * must thus no longer be used
3152 identity_master_cb (void *cls,
3153 struct GNUNET_IDENTITY_Ego *ego,
3160 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3161 _("No ego configured for `%s`\n"),
3163 GNUNET_SCHEDULER_shutdown ();
3166 GNUNET_IDENTITY_ego_get_public_key (ego,
3173 * Main function that will be run
3175 * @param cls closure
3176 * @param args remaining command-line arguments
3177 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
3178 * @param c configuration
3183 const char *cfgfile,
3184 const struct GNUNET_CONFIGURATION_Handle *c)
3186 char* cafile_cfg = NULL;
3191 if (NULL == (curl_multi = curl_multi_init ()))
3193 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3194 "Failed to create cURL multi handle!\n");
3197 cafile = cafile_opt;
3200 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "gns-proxy",
3204 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
3209 cafile = cafile_cfg;
3211 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3212 "Using %s as CA\n", cafile);
3214 gnutls_global_init ();
3215 gnutls_x509_crt_init (&proxy_ca.cert);
3216 gnutls_x509_privkey_init (&proxy_ca.key);
3218 if ( (GNUNET_OK != load_cert_from_file (proxy_ca.cert, cafile)) ||
3219 (GNUNET_OK != load_key_from_file (proxy_ca.key, cafile)) )
3221 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3222 _("Failed to load SSL/TLS key and certificate from `%s'\n"),
3224 gnutls_x509_crt_deinit (proxy_ca.cert);
3225 gnutls_x509_privkey_deinit (proxy_ca.key);
3226 gnutls_global_deinit ();
3227 GNUNET_free_non_null (cafile_cfg);
3230 GNUNET_free_non_null (cafile_cfg);
3231 if (NULL == (gns_handle = GNUNET_GNS_connect (cfg)))
3233 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3234 "Unable to connect to GNS!\n");
3235 gnutls_x509_crt_deinit (proxy_ca.cert);
3236 gnutls_x509_privkey_deinit (proxy_ca.key);
3237 gnutls_global_deinit ();
3240 identity = GNUNET_IDENTITY_connect (cfg,
3242 id_op = GNUNET_IDENTITY_get (identity,
3244 &identity_master_cb,
3246 GNUNET_SCHEDULER_add_shutdown (&do_shutdown, NULL);
3251 * The main function for gnunet-gns-proxy.
3253 * @param argc number of arguments from the command line
3254 * @param argv command line arguments
3255 * @return 0 ok, 1 on error
3258 main (int argc, char *const *argv)
3260 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
3262 gettext_noop ("listen on specified port (default: 7777)"), 1,
3263 &GNUNET_GETOPT_set_ulong, &port},
3264 {'a', "authority", NULL,
3265 gettext_noop ("pem file to use as CA"), 1,
3266 &GNUNET_GETOPT_set_string, &cafile_opt},
3267 GNUNET_GETOPT_OPTION_END
3269 static const char* page =
3270 "<html><head><title>gnunet-gns-proxy</title>"
3271 "</head><body>cURL fail</body></html>";
3274 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv,
3277 GNUNET_log_setup ("gnunet-gns-proxy",
3280 curl_failure_response
3281 = MHD_create_response_from_buffer (strlen (page),
3283 MHD_RESPMEM_PERSISTENT);
3287 GNUNET_PROGRAM_run (argc, argv,
3289 _("GNUnet GNS proxy"),
3291 &run, NULL)) ? 0 : 1;
3292 MHD_destroy_response (curl_failure_response);
3293 GNUNET_free_non_null ((char *) argv);
3297 /* end of gnunet-gns-proxy.c */