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 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 *********************** */
790 curl_download_prepare ();
793 * Callback for MHD response generation. This function is called from
794 * MHD whenever MHD expects to get data back. Copies data from the
795 * io_buf, if available.
797 * @param cls closure with our `struct Socks5Request`
798 * @param pos in buffer
799 * @param buf where to copy data
800 * @param max available space in @a buf
801 * @return number of bytes written to @a buf
804 mhd_content_cb (void *cls,
809 struct Socks5Request *s5r = cls;
810 size_t bytes_to_copy;
812 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
813 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
815 /* we're still not done with the upload, do not yet
816 start the download, the IO buffer is still full
818 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
819 "Pausing MHD download, not yet ready for download\n");
820 return 0; /* not yet ready for data download */
822 bytes_to_copy = GNUNET_MIN (max,
824 if ( (0 == bytes_to_copy) &&
825 (SOCKS5_SOCKET_DOWNLOAD_DONE != s5r->state) )
827 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
828 "Pausing MHD download, no data available\n");
829 if (NULL != s5r->curl)
831 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
832 curl_download_prepare ();
834 return 0; /* more data later */
836 if ( (0 == bytes_to_copy) &&
837 (SOCKS5_SOCKET_DOWNLOAD_DONE == s5r->state) )
839 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
840 "Completed MHD download\n");
841 return MHD_CONTENT_READER_END_OF_STREAM;
843 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
844 "Writing %lu/%lu bytes\n", bytes_to_copy, s5r->io_len);
845 GNUNET_memcpy (buf, s5r->io_buf, bytes_to_copy);
846 memmove (s5r->io_buf,
847 &s5r->io_buf[bytes_to_copy],
848 s5r->io_len - bytes_to_copy);
849 s5r->io_len -= bytes_to_copy;
850 if (NULL != s5r->curl)
851 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
852 return bytes_to_copy;
857 * Check that the website has presented us with a valid SSL certificate.
858 * The certificate must either match the domain name or the LEHO name
859 * (or, if available, the TLSA record).
861 * @param s5r request to check for.
862 * @return #GNUNET_OK if the certificate is valid
865 check_ssl_certificate (struct Socks5Request *s5r)
867 unsigned int cert_list_size;
868 const gnutls_datum_t *chainp;
869 const struct curl_tlssessioninfo *tlsinfo;
870 char certdn[GNUNET_DNSPARSER_MAX_NAME_LENGTH + 3];
872 gnutls_x509_crt_t x509_cert;
876 s5r->ssl_checked = GNUNET_YES;
877 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
878 "Checking SSL certificate\n");
880 curl_easy_getinfo (s5r->curl,
881 CURLINFO_TLS_SESSION,
882 (struct curl_slist **) &tlsinfo))
883 return GNUNET_SYSERR;
884 if (CURLSSLBACKEND_GNUTLS != tlsinfo->backend)
886 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
887 _("Unsupported CURL SSL backend %d\n"),
889 return GNUNET_SYSERR;
891 chainp = gnutls_certificate_get_peers (tlsinfo->internals, &cert_list_size);
892 if ( (! chainp) || (0 == cert_list_size) )
893 return GNUNET_SYSERR;
895 size = sizeof (certdn);
896 /* initialize an X.509 certificate structure. */
897 gnutls_x509_crt_init (&x509_cert);
898 gnutls_x509_crt_import (x509_cert,
900 GNUTLS_X509_FMT_DER);
902 if (0 != (rc = gnutls_x509_crt_get_dn_by_oid (x509_cert,
903 GNUTLS_OID_X520_COMMON_NAME,
904 0, /* the first and only one */
905 0 /* no DER encoding */,
909 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
910 _("Failed to fetch CN from cert: %s\n"),
911 gnutls_strerror(rc));
912 gnutls_x509_crt_deinit (x509_cert);
913 return GNUNET_SYSERR;
915 /* check for TLSA/DANE records */
917 if (NULL != s5r->dane_data)
919 char *dd[] = { s5r->dane_data, NULL };
920 int dlen[] = { s5r->dane_data_len, 0};
921 dane_state_t dane_state;
922 dane_query_t dane_query;
925 /* FIXME: add flags to gnutls to NOT read UNBOUND_ROOT_KEY_FILE here! */
926 if (0 != (rc = dane_state_init (&dane_state,
927 #ifdef DANE_F_IGNORE_DNSSEC
928 DANE_F_IGNORE_DNSSEC |
930 DANE_F_IGNORE_LOCAL_RESOLVER)))
932 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
933 _("Failed to initialize DANE: %s\n"),
935 gnutls_x509_crt_deinit (x509_cert);
936 return GNUNET_SYSERR;
938 if (0 != (rc = dane_raw_tlsa (dane_state,
945 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
946 _("Failed to parse DANE record: %s\n"),
948 dane_state_deinit (dane_state);
949 gnutls_x509_crt_deinit (x509_cert);
950 return GNUNET_SYSERR;
952 if (0 != (rc = dane_verify_crt_raw (dane_state,
955 gnutls_certificate_type_get (tlsinfo->internals),
960 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
961 _("Failed to verify TLS connection using DANE: %s\n"),
963 dane_query_deinit (dane_query);
964 dane_state_deinit (dane_state);
965 gnutls_x509_crt_deinit (x509_cert);
966 return GNUNET_SYSERR;
970 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
971 _("Failed DANE verification failed with GnuTLS verify status code: %u\n"),
973 dane_query_deinit (dane_query);
974 dane_state_deinit (dane_state);
975 gnutls_x509_crt_deinit (x509_cert);
976 return GNUNET_SYSERR;
978 dane_query_deinit (dane_query);
979 dane_state_deinit (dane_state);
985 /* try LEHO or ordinary domain name X509 verification */
987 if (NULL != s5r->leho)
991 if (0 == (rc = gnutls_x509_crt_check_hostname (x509_cert,
994 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
995 _("SSL certificate subject name (%s) does not match `%s'\n"),
998 gnutls_x509_crt_deinit (x509_cert);
999 return GNUNET_SYSERR;
1004 /* we did not even have the domain name!? */
1006 return GNUNET_SYSERR;
1009 gnutls_x509_crt_deinit (x509_cert);
1015 * We're getting an HTTP response header from cURL. Convert it to the
1016 * MHD response headers. Mostly copies the headers, but makes special
1017 * adjustments to "Set-Cookie" and "Location" headers as those may need
1018 * to be changed from the LEHO to the domain the browser expects.
1020 * @param buffer curl buffer with a single line of header data; not 0-terminated!
1021 * @param size curl blocksize
1022 * @param nmemb curl blocknumber
1023 * @param cls our `struct Socks5Request *`
1024 * @return size of processed bytes
1027 curl_check_hdr (void *buffer, size_t size, size_t nmemb, void *cls)
1029 struct Socks5Request *s5r = cls;
1030 struct HttpResponseHeader *header;
1031 size_t bytes = size * nmemb;
1033 const char *hdr_type;
1034 const char *cookie_domain;
1036 char *new_cookie_hdr;
1039 size_t delta_cdomain;
1043 /* first, check SSL certificate */
1044 if ((GNUNET_YES != s5r->ssl_checked) &&
1045 (HTTPS_PORT == s5r->port))
1047 if (GNUNET_OK != check_ssl_certificate (s5r))
1051 ndup = GNUNET_strndup (buffer, bytes);
1052 hdr_type = strtok (ndup, ":");
1053 if (NULL == hdr_type)
1058 hdr_val = strtok (NULL, "");
1059 if (NULL == hdr_val)
1064 if (' ' == *hdr_val)
1067 /* custom logic for certain header types */
1068 new_cookie_hdr = NULL;
1069 if ( (NULL != s5r->leho) &&
1070 (0 == strcasecmp (hdr_type,
1071 MHD_HTTP_HEADER_SET_COOKIE)) )
1074 new_cookie_hdr = GNUNET_malloc (strlen (hdr_val) +
1075 strlen (s5r->domain) + 1);
1077 domain_matched = GNUNET_NO; /* make sure we match domain at most once */
1078 for (tok = strtok (hdr_val, ";"); NULL != tok; tok = strtok (NULL, ";"))
1080 if ( (0 == strncasecmp (tok, " domain", strlen (" domain"))) &&
1081 (GNUNET_NO == domain_matched) )
1083 domain_matched = GNUNET_YES;
1084 cookie_domain = tok + strlen (" domain") + 1;
1085 if (strlen (cookie_domain) < strlen (s5r->leho))
1087 delta_cdomain = strlen (s5r->leho) - strlen (cookie_domain);
1088 if (0 == strcasecmp (cookie_domain, s5r->leho + delta_cdomain))
1090 offset += sprintf (new_cookie_hdr + offset,
1096 else if (0 == strcmp (cookie_domain, s5r->leho))
1098 offset += sprintf (new_cookie_hdr + offset,
1103 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1104 _("Cookie domain `%s' supplied by server is invalid\n"),
1107 GNUNET_memcpy (new_cookie_hdr + offset, tok, strlen (tok));
1108 offset += strlen (tok);
1109 new_cookie_hdr[offset++] = ';';
1111 hdr_val = new_cookie_hdr;
1114 new_location = NULL;
1115 if (0 == strcasecmp (MHD_HTTP_HEADER_LOCATION, hdr_type))
1119 GNUNET_asprintf (&leho_host,
1120 (HTTPS_PORT != s5r->port)
1124 if (0 == strncmp (leho_host,
1126 strlen (leho_host)))
1128 GNUNET_asprintf (&new_location,
1130 (HTTPS_PORT != s5r->port)
1134 hdr_val + strlen (leho_host));
1135 hdr_val = new_location;
1137 GNUNET_free (leho_host);
1139 /* MHD does not allow certain characters in values, remove those */
1140 if (NULL != (tok = strchr (hdr_val, '\n')))
1142 if (NULL != (tok = strchr (hdr_val, '\r')))
1144 if (NULL != (tok = strchr (hdr_val, '\t')))
1146 if (0 != strlen (hdr_val)) /* Rely in MHD to set those */
1148 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1149 "Adding header %s: %s to MHD response\n",
1152 header = GNUNET_new (struct HttpResponseHeader);
1153 header->type = GNUNET_strndup (hdr_type, strlen (hdr_type));
1154 header->value = GNUNET_strndup (hdr_val, strlen (hdr_val));
1155 GNUNET_CONTAINER_DLL_insert (s5r->header_head,
1160 GNUNET_free_non_null (new_cookie_hdr);
1161 GNUNET_free_non_null (new_location);
1166 create_mhd_response_from_s5r (struct Socks5Request *s5r)
1169 double content_length;
1170 struct HttpResponseHeader *header;
1172 if (NULL != s5r->response)
1174 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1175 "Response already set!\n");
1176 return GNUNET_SYSERR;
1179 GNUNET_break (CURLE_OK ==
1180 curl_easy_getinfo (s5r->curl,
1181 CURLINFO_RESPONSE_CODE,
1183 GNUNET_break (CURLE_OK ==
1184 curl_easy_getinfo (s5r->curl,
1185 CURLINFO_CONTENT_LENGTH_DOWNLOAD,
1187 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1188 "Creating MHD response with code %d and size %d\n",
1189 (int) resp_code, (int) content_length);
1190 s5r->response_code = resp_code;
1191 s5r->response = MHD_create_response_from_callback ((-1 == content_length) ? MHD_SIZE_UNKNOWN : content_length,
1196 for (header = s5r->header_head; NULL != header; header = header->next)
1198 GNUNET_break (MHD_YES ==
1199 MHD_add_response_header (s5r->response,
1204 if (NULL != s5r->leho)
1208 GNUNET_asprintf (&cors_hdr,
1209 (HTTPS_PORT == s5r->port)
1214 GNUNET_break (MHD_YES ==
1215 MHD_add_response_header (s5r->response,
1216 MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN,
1218 GNUNET_free (cors_hdr);
1220 /* force connection to be closed after each request, as we
1221 do not support HTTP pipelining (yet, FIXME!) */
1222 /*GNUNET_break (MHD_YES ==
1223 MHD_add_response_header (s5r->response,
1224 MHD_HTTP_HEADER_CONNECTION,
1230 * Handle response payload data from cURL. Copies it into our `io_buf` to make
1231 * it available to MHD.
1233 * @param ptr pointer to the data
1234 * @param size number of blocks of data
1235 * @param nmemb blocksize
1236 * @param ctx our `struct Socks5Request *`
1237 * @return number of bytes handled
1240 curl_download_cb (void *ptr, size_t size, size_t nmemb, void* ctx)
1242 struct Socks5Request *s5r = ctx;
1243 size_t total = size * nmemb;
1245 if (NULL == s5r->response)
1246 GNUNET_assert (GNUNET_OK == create_mhd_response_from_s5r (s5r));
1248 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
1249 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1251 /* we're still not done with the upload, do not yet
1252 start the download, the IO buffer is still full
1253 with upload data. */
1254 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1255 "Pausing CURL download, waiting for UPLOAD to finish\n");
1256 return CURL_WRITEFUNC_PAUSE; /* not yet ready for data download */
1258 if (sizeof (s5r->io_buf) - s5r->io_len < total)
1260 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1261 "Pausing CURL download, not enough space %lu %lu %lu\n", sizeof (s5r->io_buf),
1262 s5r->io_len, total);
1263 return CURL_WRITEFUNC_PAUSE; /* not enough space */
1265 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
1268 s5r->io_len += total;
1269 if (s5r->io_len == total)
1270 run_mhd_now (s5r->hd);
1276 * cURL callback for uploaded (PUT/POST) data. Copies it into our `io_buf`
1277 * to make it available to MHD.
1279 * @param buf where to write the data
1280 * @param size number of bytes per member
1281 * @param nmemb number of members available in @a buf
1282 * @param cls our `struct Socks5Request` that generated the data
1283 * @return number of bytes copied to @a buf
1286 curl_upload_cb (void *buf, size_t size, size_t nmemb, void *cls)
1288 struct Socks5Request *s5r = cls;
1289 size_t len = size * nmemb;
1292 if ( (0 == s5r->io_len) &&
1293 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1295 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1296 "Pausing CURL UPLOAD, need more data\n");
1297 return CURL_READFUNC_PAUSE;
1299 if ( (0 == s5r->io_len) &&
1300 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1302 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1303 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1304 "Completed CURL UPLOAD\n");
1305 return 0; /* upload finished, can now download */
1307 if ( (SOCKS5_SOCKET_UPLOAD_STARTED != s5r->state) &&
1308 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1311 return CURL_READFUNC_ABORT;
1313 to_copy = GNUNET_MIN (s5r->io_len,
1315 GNUNET_memcpy (buf, s5r->io_buf, to_copy);
1316 memmove (s5r->io_buf,
1317 &s5r->io_buf[to_copy],
1318 s5r->io_len - to_copy);
1319 s5r->io_len -= to_copy;
1320 if (s5r->io_len + to_copy == sizeof (s5r->io_buf))
1321 run_mhd_now (s5r->hd); /* got more space for upload now */
1326 /* ************************** main loop of cURL interaction ****************** */
1330 * Task that is run when we are ready to receive more data
1333 * @param cls closure
1336 curl_task_download (void *cls);
1340 * Ask cURL for the select() sets and schedule cURL operations.
1343 curl_download_prepare ()
1350 struct GNUNET_NETWORK_FDSet *grs;
1351 struct GNUNET_NETWORK_FDSet *gws;
1353 struct GNUNET_TIME_Relative rtime;
1355 if (NULL != curl_download_task)
1357 GNUNET_SCHEDULER_cancel (curl_download_task);
1358 curl_download_task = NULL;
1364 if (CURLM_OK != (mret = curl_multi_fdset (curl_multi, &rs, &ws, &es, &max)))
1366 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1367 "%s failed at %s:%d: `%s'\n",
1368 "curl_multi_fdset", __FILE__, __LINE__,
1369 curl_multi_strerror (mret));
1373 GNUNET_break (CURLM_OK == curl_multi_timeout (curl_multi, &to));
1375 rtime = GNUNET_TIME_UNIT_FOREVER_REL;
1377 rtime = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, to);
1380 grs = GNUNET_NETWORK_fdset_create ();
1381 gws = GNUNET_NETWORK_fdset_create ();
1382 GNUNET_NETWORK_fdset_copy_native (grs, &rs, max + 1);
1383 GNUNET_NETWORK_fdset_copy_native (gws, &ws, max + 1);
1384 curl_download_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1387 &curl_task_download, curl_multi);
1388 GNUNET_NETWORK_fdset_destroy (gws);
1389 GNUNET_NETWORK_fdset_destroy (grs);
1393 curl_download_task = GNUNET_SCHEDULER_add_delayed (rtime,
1394 &curl_task_download,
1401 * Task that is run when we are ready to receive more data from curl.
1403 * @param cls closure, NULL
1406 curl_task_download (void *cls)
1410 struct CURLMsg *msg;
1412 struct Socks5Request *s5r;
1414 curl_download_task = NULL;
1418 mret = curl_multi_perform (curl_multi, &running);
1419 while (NULL != (msg = curl_multi_info_read (curl_multi, &msgnum)))
1421 GNUNET_break (CURLE_OK ==
1422 curl_easy_getinfo (msg->easy_handle,
1433 /* documentation says this is not used */
1437 switch (msg->data.result)
1440 case CURLE_GOT_NOTHING:
1441 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1442 "CURL download completed.\n");
1443 if (NULL == s5r->response)
1444 GNUNET_assert (GNUNET_OK == create_mhd_response_from_s5r (s5r));
1445 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1446 run_mhd_now (s5r->hd);
1449 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1450 "Download curl failed: %s\n",
1451 curl_easy_strerror (msg->data.result));
1452 /* FIXME: indicate error somehow? close MHD connection badly as well? */
1453 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1454 run_mhd_now (s5r->hd);
1457 if (NULL == s5r->response)
1458 s5r->response = curl_failure_response;
1461 /* documentation says this is not used */
1465 /* unexpected status code */
1470 } while (mret == CURLM_CALL_MULTI_PERFORM);
1471 if (CURLM_OK != mret)
1472 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1473 "%s failed at %s:%d: `%s'\n",
1474 "curl_multi_perform", __FILE__, __LINE__,
1475 curl_multi_strerror (mret));
1478 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1479 "Suspending cURL multi loop, no more events pending\n");
1480 return; /* nothing more in progress */
1482 curl_download_prepare ();
1486 /* ********************************* MHD response generation ******************* */
1490 * Read HTTP request header field from the request. Copies the fields
1491 * over to the 'headers' that will be given to curl. However, 'Host'
1492 * is substituted with the LEHO if present. We also change the
1493 * 'Connection' header value to "close" as the proxy does not support
1496 * @param cls our `struct Socks5Request`
1497 * @param kind value kind
1498 * @param key field key
1499 * @param value field value
1500 * @return MHD_YES to continue to iterate
1503 con_val_iter (void *cls,
1504 enum MHD_ValueKind kind,
1508 struct Socks5Request *s5r = cls;
1511 if ( (0 == strcasecmp (MHD_HTTP_HEADER_HOST, key)) &&
1512 (NULL != s5r->leho) )
1514 if (0 == strcasecmp (MHD_HTTP_HEADER_CONTENT_LENGTH, key))
1516 if (0 == strcasecmp (MHD_HTTP_HEADER_ACCEPT_ENCODING, key))
1518 GNUNET_asprintf (&hdr,
1522 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1523 "Adding HEADER `%s' to HTTP request\n",
1525 s5r->headers = curl_slist_append (s5r->headers,
1533 * Main MHD callback for handling requests.
1536 * @param con MHD connection handle
1537 * @param url the url in the request
1538 * @param meth the HTTP method used ("GET", "PUT", etc.)
1539 * @param ver the HTTP version string (i.e. "HTTP/1.1")
1540 * @param upload_data the data being uploaded (excluding HEADERS,
1541 * for a POST that fits into memory and that is encoded
1542 * with a supported encoding, the POST data will NOT be
1543 * given in upload_data and is instead available as
1544 * part of MHD_get_connection_values; very large POST
1545 * data *will* be made available incrementally in
1547 * @param upload_data_size set initially to the size of the
1548 * @a upload_data provided; the method must update this
1549 * value to the number of bytes NOT processed;
1550 * @param con_cls pointer to location where we store the 'struct Request'
1551 * @return MHD_YES if the connection was handled successfully,
1552 * MHD_NO if the socket must be closed due to a serious
1553 * error while handling the request
1556 create_response (void *cls,
1557 struct MHD_Connection *con,
1561 const char *upload_data,
1562 size_t *upload_data_size,
1565 struct Socks5Request *s5r = *con_cls;
1568 char ipstring[INET6_ADDRSTRLEN];
1569 char ipaddr[INET6_ADDRSTRLEN + 2];
1570 const struct sockaddr *sa;
1571 const struct sockaddr_in *s4;
1572 const struct sockaddr_in6 *s6;
1582 if (SOCKS5_SOCKET_WITH_MHD == s5r->state)
1584 /* first time here, initialize curl handle */
1585 sa = (const struct sockaddr *) &s5r->destination_address;
1586 switch (sa->sa_family)
1589 s4 = (const struct sockaddr_in *) &s5r->destination_address;
1590 if (NULL == inet_ntop (AF_INET,
1598 GNUNET_snprintf (ipaddr,
1602 port = ntohs (s4->sin_port);
1605 s6 = (const struct sockaddr_in6 *) &s5r->destination_address;
1606 if (NULL == inet_ntop (AF_INET6,
1614 GNUNET_snprintf (ipaddr,
1618 port = ntohs (s6->sin6_port);
1624 if (NULL == s5r->curl)
1625 s5r->curl = curl_easy_init ();
1626 if (NULL == s5r->curl)
1627 return MHD_queue_response (con,
1628 MHD_HTTP_INTERNAL_SERVER_ERROR,
1629 curl_failure_response);
1630 curl_easy_setopt (s5r->curl, CURLOPT_HEADERFUNCTION, &curl_check_hdr);
1631 curl_easy_setopt (s5r->curl, CURLOPT_HEADERDATA, s5r);
1632 curl_easy_setopt (s5r->curl, CURLOPT_FOLLOWLOCATION, 0);
1633 curl_easy_setopt (s5r->curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
1634 curl_easy_setopt (s5r->curl, CURLOPT_CONNECTTIMEOUT, 600L);
1635 curl_easy_setopt (s5r->curl, CURLOPT_TIMEOUT, 600L);
1636 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1637 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_CONTENT_DECODING, 0);
1638 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_TRANSFER_DECODING, 0);
1639 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1640 curl_easy_setopt (s5r->curl, CURLOPT_PRIVATE, s5r);
1641 curl_easy_setopt (s5r->curl, CURLOPT_VERBOSE, 0);
1643 * Pre-populate cache to resolve Hostname.
1644 * This is necessary as the DNS name in the CURLOPT_URL is used
1645 * for SNI http://de.wikipedia.org/wiki/Server_Name_Indication
1647 if (NULL != s5r->leho)
1649 GNUNET_asprintf (&curl_hosts,
1654 s5r->hosts = curl_slist_append(NULL, curl_hosts);
1655 curl_easy_setopt(s5r->curl, CURLOPT_RESOLVE, s5r->hosts);
1656 GNUNET_free (curl_hosts);
1658 GNUNET_asprintf (&curlurl,
1659 (HTTPS_PORT != s5r->port)
1661 : "https://%s:%d%s",
1667 curl_easy_setopt (s5r->curl,
1670 GNUNET_free (curlurl);
1671 if (0 == strcasecmp (meth, MHD_HTTP_METHOD_PUT))
1673 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1674 curl_easy_setopt (s5r->curl, CURLOPT_UPLOAD, 1);
1675 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1676 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1677 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1678 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1680 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_POST))
1682 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1683 curl_easy_setopt (s5r->curl, CURLOPT_POST, 1L);
1684 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1685 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1686 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1687 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1689 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_HEAD))
1691 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1692 curl_easy_setopt (s5r->curl, CURLOPT_NOBODY, 1);
1694 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_OPTIONS))
1696 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1697 curl_easy_setopt (s5r->curl, CURLOPT_CUSTOMREQUEST, "OPTIONS");
1699 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_GET))
1701 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1702 curl_easy_setopt (s5r->curl, CURLOPT_HTTPGET, 1);
1703 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1704 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1708 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1709 _("Unsupported HTTP method `%s'\n"),
1711 curl_easy_cleanup (s5r->curl);
1716 if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_0))
1718 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
1720 else if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_1))
1722 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
1726 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_NONE);
1729 if (HTTPS_PORT == s5r->port)
1731 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);
1732 if (NULL != s5r->dane_data)
1733 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYPEER, 0L);
1735 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYPEER, 1L);
1736 /* Disable cURL checking the hostname, as we will check ourselves
1737 as only we have the domain name or the LEHO or the DANE record */
1738 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYHOST, 0L);
1742 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_NONE);
1745 if (CURLM_OK != curl_multi_add_handle (curl_multi, s5r->curl))
1748 curl_easy_cleanup (s5r->curl);
1752 MHD_get_connection_values (con,
1754 &con_val_iter, s5r);
1755 curl_easy_setopt (s5r->curl, CURLOPT_HTTPHEADER, s5r->headers);
1756 curl_download_prepare ();
1760 /* continuing to process request */
1761 if (0 != *upload_data_size)
1764 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1765 "Processing %u bytes UPLOAD\n",
1766 (unsigned int) *upload_data_size);
1768 /* FIXME: This must be set or a header with Transfer-Encoding: chunked. Else
1769 * upload callback is not called!
1771 curl_easy_setopt (s5r->curl, CURLOPT_POSTFIELDSIZE, *upload_data_size);
1773 left = GNUNET_MIN (*upload_data_size,
1774 sizeof (s5r->io_buf) - s5r->io_len);
1775 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
1778 s5r->io_len += left;
1779 *upload_data_size -= left;
1780 GNUNET_assert (NULL != s5r->curl);
1781 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
1784 if (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state)
1786 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1787 "Finished processing UPLOAD\n");
1788 s5r->state = SOCKS5_SOCKET_UPLOAD_DONE;
1790 if (NULL == s5r->response)
1792 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1793 "Queueing response with MHD\n");
1794 run_mhd_now (s5r->hd);
1795 return MHD_queue_response (con,
1801 /* ******************** MHD HTTP setup and event loop ******************** */
1805 * Function called when MHD decides that we are done with a request.
1808 * @param connection connection handle
1809 * @param con_cls value as set by the last call to
1810 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
1811 * @param toe reason for request termination (ignored)
1814 mhd_completed_cb (void *cls,
1815 struct MHD_Connection *connection,
1817 enum MHD_RequestTerminationCode toe)
1819 struct Socks5Request *s5r = *con_cls;
1820 struct HttpResponseHeader *header;
1824 if (MHD_REQUEST_TERMINATED_COMPLETED_OK != toe)
1825 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1826 "MHD encountered error handling request: %d\n",
1828 if (NULL != s5r->curl)
1830 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1831 "Resetting cURL handle\n");
1832 curl_multi_remove_handle (curl_multi, s5r->curl);
1833 curl_slist_free_all (s5r->headers);
1834 s5r->headers = NULL;
1835 curl_easy_reset (s5r->curl);
1840 if ( (NULL != s5r->response) &&
1841 (curl_failure_response != s5r->response) )
1842 MHD_destroy_response (s5r->response);
1843 for (header = s5r->header_head; header != NULL; header = s5r->header_head)
1845 GNUNET_CONTAINER_DLL_remove (s5r->header_head,
1848 GNUNET_free (header->type);
1849 GNUNET_free (header->value);
1850 GNUNET_free (header);
1852 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Finished request for %s\n", s5r->url);
1853 GNUNET_free (s5r->url);
1854 s5r->state = SOCKS5_SOCKET_WITH_MHD;
1856 s5r->response = NULL;
1862 * Function called when MHD connection is opened or closed.
1865 * @param connection connection handle
1866 * @param con_cls value as set by the last call to
1867 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
1868 * @param toe connection notification type
1871 mhd_connection_cb (void *cls,
1872 struct MHD_Connection *connection,
1874 enum MHD_ConnectionNotificationCode cnc)
1876 struct Socks5Request *s5r;
1877 const union MHD_ConnectionInfo *ci;
1882 case MHD_CONNECTION_NOTIFY_STARTED:
1883 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection started...\n");
1884 ci = MHD_get_connection_info (connection,
1885 MHD_CONNECTION_INFO_CONNECTION_FD);
1891 sock = ci->connect_fd;
1892 for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
1894 if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
1896 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1897 "Context set...\n");
1898 s5r->ssl_checked = GNUNET_NO;
1904 case MHD_CONNECTION_NOTIFY_CLOSED:
1905 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1906 "Connection closed... cleaning up\n");
1910 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1911 "Connection stale!\n");
1915 curl_download_prepare ();
1924 * Function called when MHD first processes an incoming connection.
1925 * Gives us the respective URI information.
1927 * We use this to associate the `struct MHD_Connection` with our
1928 * internal `struct Socks5Request` data structure (by checking
1929 * for matching sockets).
1931 * @param cls the HTTP server handle (a `struct MhdHttpList`)
1932 * @param url the URL that is being requested
1933 * @param connection MHD connection object for the request
1934 * @return the `struct Socks5Request` that this @a connection is for
1937 mhd_log_callback (void *cls,
1939 struct MHD_Connection *connection)
1941 struct Socks5Request *s5r;
1942 const union MHD_ConnectionInfo *ci;
1944 ci = MHD_get_connection_info (connection,
1945 MHD_CONNECTION_INFO_SOCKET_CONTEXT);
1946 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Processing %s\n", url);
1952 s5r = ci->socket_context;
1953 if (NULL != s5r->url)
1958 s5r->url = GNUNET_strdup (url);
1959 if (NULL != s5r->timeout_task)
1960 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
1961 s5r->timeout_task = NULL;
1962 GNUNET_assert (s5r->state == SOCKS5_SOCKET_WITH_MHD);
1968 * Kill the given MHD daemon.
1970 * @param hd daemon to stop
1973 kill_httpd (struct MhdHttpList *hd)
1975 GNUNET_CONTAINER_DLL_remove (mhd_httpd_head,
1978 GNUNET_free_non_null (hd->domain);
1979 MHD_stop_daemon (hd->daemon);
1980 if (NULL != hd->httpd_task)
1982 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1983 hd->httpd_task = NULL;
1985 GNUNET_free_non_null (hd->proxy_cert);
1993 * Task run whenever HTTP server is idle for too long. Kill it.
1995 * @param cls the `struct MhdHttpList *`
1998 kill_httpd_task (void *cls)
2000 struct MhdHttpList *hd = cls;
2002 hd->httpd_task = NULL;
2008 * Task run whenever HTTP server operations are pending.
2010 * @param cls the `struct MhdHttpList *` of the daemon that is being run
2013 do_httpd (void *cls);
2017 * Schedule MHD. This function should be called initially when an
2018 * MHD is first getting its client socket, and will then automatically
2019 * always be called later whenever there is work to be done.
2021 * @param hd the daemon to schedule
2024 schedule_httpd (struct MhdHttpList *hd)
2029 struct GNUNET_NETWORK_FDSet *wrs;
2030 struct GNUNET_NETWORK_FDSet *wws;
2033 MHD_UNSIGNED_LONG_LONG timeout;
2034 struct GNUNET_TIME_Relative tv;
2040 if (MHD_YES != MHD_get_fdset (hd->daemon, &rs, &ws, &es, &max))
2045 haveto = MHD_get_timeout (hd->daemon, &timeout);
2046 if (MHD_YES == haveto)
2047 tv.rel_value_us = (uint64_t) timeout * 1000LL;
2049 tv = GNUNET_TIME_UNIT_FOREVER_REL;
2052 wrs = GNUNET_NETWORK_fdset_create ();
2053 wws = GNUNET_NETWORK_fdset_create ();
2054 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
2055 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
2062 if (NULL != hd->httpd_task)
2063 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2064 if ( (MHD_YES != haveto) &&
2068 /* daemon is idle, kill after timeout */
2069 hd->httpd_task = GNUNET_SCHEDULER_add_delayed (MHD_CACHE_TIMEOUT,
2076 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2081 GNUNET_NETWORK_fdset_destroy (wrs);
2083 GNUNET_NETWORK_fdset_destroy (wws);
2088 * Task run whenever HTTP server operations are pending.
2090 * @param cls the `struct MhdHttpList` of the daemon that is being run
2093 do_httpd (void *cls)
2095 struct MhdHttpList *hd = cls;
2097 hd->httpd_task = NULL;
2098 MHD_run (hd->daemon);
2099 schedule_httpd (hd);
2104 * Run MHD now, we have extra data ready for the callback.
2106 * @param hd the daemon to run now.
2109 run_mhd_now (struct MhdHttpList *hd)
2113 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2114 hd->httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd,
2120 * Read file in filename
2122 * @param filename file to read
2123 * @param size pointer where filesize is stored
2124 * @return NULL on error
2127 load_file (const char* filename,
2134 GNUNET_DISK_file_size (filename, &fsize,
2135 GNUNET_YES, GNUNET_YES))
2137 if (fsize > MAX_PEM_SIZE)
2139 *size = (unsigned int) fsize;
2140 buffer = GNUNET_malloc (*size);
2141 if (fsize != GNUNET_DISK_fn_read (filename, buffer, (size_t) fsize))
2143 GNUNET_free (buffer);
2151 * Load PEM key from file
2153 * @param key where to store the data
2154 * @param keyfile path to the PEM file
2155 * @return #GNUNET_OK on success
2158 load_key_from_file (gnutls_x509_privkey_t key,
2159 const char* keyfile)
2161 gnutls_datum_t key_data;
2164 key_data.data = load_file (keyfile, &key_data.size);
2165 if (NULL == key_data.data)
2166 return GNUNET_SYSERR;
2167 ret = gnutls_x509_privkey_import (key, &key_data,
2168 GNUTLS_X509_FMT_PEM);
2169 if (GNUTLS_E_SUCCESS != ret)
2171 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2172 _("Unable to import private key from file `%s'\n"),
2175 GNUNET_free_non_null (key_data.data);
2176 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2181 * Load cert from file
2183 * @param crt struct to store data in
2184 * @param certfile path to pem file
2185 * @return #GNUNET_OK on success
2188 load_cert_from_file (gnutls_x509_crt_t crt,
2189 const char* certfile)
2191 gnutls_datum_t cert_data;
2194 cert_data.data = load_file (certfile, &cert_data.size);
2195 if (NULL == cert_data.data)
2196 return GNUNET_SYSERR;
2197 ret = gnutls_x509_crt_import (crt, &cert_data,
2198 GNUTLS_X509_FMT_PEM);
2199 if (GNUTLS_E_SUCCESS != ret)
2201 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2202 _("Unable to import certificate %s\n"), certfile);
2204 GNUNET_free_non_null (cert_data.data);
2205 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2210 * Generate new certificate for specific name
2212 * @param name the subject name to generate a cert for
2213 * @return a struct holding the PEM data, NULL on error
2215 static struct ProxyGNSCertificate *
2216 generate_gns_certificate (const char *name)
2218 unsigned int serial;
2219 size_t key_buf_size;
2220 size_t cert_buf_size;
2221 gnutls_x509_crt_t request;
2224 struct ProxyGNSCertificate *pgc;
2226 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2227 "Generating TLS/SSL certificate for `%s'\n",
2229 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_init (&request));
2230 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_key (request, proxy_ca.key));
2231 pgc = GNUNET_new (struct ProxyGNSCertificate);
2232 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COUNTRY_NAME,
2234 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_ORGANIZATION_NAME,
2235 0, "GNU Name System", 4);
2236 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COMMON_NAME,
2237 0, name, strlen (name));
2238 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_version (request, 3));
2239 gnutls_rnd (GNUTLS_RND_NONCE, &serial, sizeof (serial));
2240 gnutls_x509_crt_set_serial (request,
2243 etime = time (NULL);
2244 tm_data = localtime (&etime);
2245 gnutls_x509_crt_set_activation_time (request,
2248 etime = mktime (tm_data);
2249 gnutls_x509_crt_set_expiration_time (request,
2251 gnutls_x509_crt_sign (request,
2254 key_buf_size = sizeof (pgc->key);
2255 cert_buf_size = sizeof (pgc->cert);
2256 gnutls_x509_crt_export (request, GNUTLS_X509_FMT_PEM,
2257 pgc->cert, &cert_buf_size);
2258 gnutls_x509_privkey_export (proxy_ca.key, GNUTLS_X509_FMT_PEM,
2259 pgc->key, &key_buf_size);
2260 gnutls_x509_crt_deinit (request);
2266 * Function called by MHD with errors, suppresses them all.
2268 * @param cls closure
2269 * @param fm format string (`printf()`-style)
2270 * @param ap arguments to @a fm
2273 mhd_error_log_callback (void *cls,
2282 * Lookup (or create) an SSL MHD instance for a particular domain.
2284 * @param domain the domain the SSL daemon has to serve
2285 * @return NULL on error
2287 static struct MhdHttpList *
2288 lookup_ssl_httpd (const char* domain)
2290 struct MhdHttpList *hd;
2291 struct ProxyGNSCertificate *pgc;
2298 for (hd = mhd_httpd_head; NULL != hd; hd = hd->next)
2299 if ( (NULL != hd->domain) &&
2300 (0 == strcmp (hd->domain, domain)) )
2302 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2303 "Starting fresh MHD HTTPS instance for domain `%s'\n",
2305 pgc = generate_gns_certificate (domain);
2306 hd = GNUNET_new (struct MhdHttpList);
2307 hd->is_ssl = GNUNET_YES;
2308 hd->domain = GNUNET_strdup (domain);
2309 hd->proxy_cert = pgc;
2310 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_SSL | MHD_USE_NO_LISTEN_SOCKET,
2313 &create_response, hd,
2314 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
2315 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
2316 MHD_OPTION_NOTIFY_CONNECTION, &mhd_connection_cb, NULL,
2317 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
2318 MHD_OPTION_EXTERNAL_LOGGER, &mhd_error_log_callback, NULL,
2319 MHD_OPTION_HTTPS_MEM_KEY, pgc->key,
2320 MHD_OPTION_HTTPS_MEM_CERT, pgc->cert,
2322 if (NULL == hd->daemon)
2328 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
2336 * Task run when a Socks5Request somehow fails to be associated with
2337 * an MHD connection (i.e. because the client never speaks HTTP after
2338 * the SOCKS5 handshake). Clean up.
2340 * @param cls the `struct Socks5Request *`
2343 timeout_s5r_handshake (void *cls)
2345 struct Socks5Request *s5r = cls;
2347 s5r->timeout_task = NULL;
2353 * We're done with the Socks5 protocol, now we need to pass the
2354 * connection data through to the final destination, either
2355 * direct (if the protocol might not be HTTP), or via MHD
2356 * (if the port looks like it should be HTTP).
2358 * @param s5r socks request that has reached the final stage
2361 setup_data_transfer (struct Socks5Request *s5r)
2363 struct MhdHttpList *hd;
2365 const struct sockaddr *addr;
2371 hd = lookup_ssl_httpd (s5r->domain);
2374 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2375 _("Failed to start HTTPS server for `%s'\n"),
2383 GNUNET_assert (NULL != httpd);
2387 fd = GNUNET_NETWORK_get_fd (s5r->sock);
2388 addr = GNUNET_NETWORK_get_addr (s5r->sock);
2389 len = GNUNET_NETWORK_get_addrlen (s5r->sock);
2390 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2391 if (MHD_YES != MHD_add_connection (hd->daemon, fd, addr, len))
2393 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2394 _("Failed to pass client to MHD\n"));
2399 schedule_httpd (hd);
2400 s5r->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_HANDSHAKE_TIMEOUT,
2401 &timeout_s5r_handshake,
2406 /* ********************* SOCKS handling ************************* */
2410 * Write data from buffer to socks5 client, then continue with state machine.
2412 * @param cls the closure with the `struct Socks5Request`
2415 do_write (void *cls)
2417 struct Socks5Request *s5r = cls;
2421 len = GNUNET_NETWORK_socket_send (s5r->sock,
2426 /* write error: connection closed, shutdown, etc.; just clean up */
2427 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2434 s5r->wbuf_len - len);
2435 s5r->wbuf_len -= len;
2436 if (s5r->wbuf_len > 0)
2438 /* not done writing */
2440 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2446 /* we're done writing, continue with state machine! */
2453 case SOCKS5_REQUEST:
2454 GNUNET_assert (NULL != s5r->rtask);
2456 case SOCKS5_DATA_TRANSFER:
2457 setup_data_transfer (s5r);
2459 case SOCKS5_WRITE_THEN_CLEANUP:
2470 * Return a server response message indicating a failure to the client.
2472 * @param s5r request to return failure code for
2473 * @param sc status code to return
2476 signal_socks_failure (struct Socks5Request *s5r,
2477 enum Socks5StatusCode sc)
2479 struct Socks5ServerResponseMessage *s_resp;
2481 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2482 memset (s_resp, 0, sizeof (struct Socks5ServerResponseMessage));
2483 s_resp->version = SOCKS_VERSION_5;
2485 s5r->state = SOCKS5_WRITE_THEN_CLEANUP;
2486 if (NULL != s5r->wtask)
2488 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2495 * Return a server response message indicating success.
2497 * @param s5r request to return success status message for
2500 signal_socks_success (struct Socks5Request *s5r)
2502 struct Socks5ServerResponseMessage *s_resp;
2504 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2505 s_resp->version = SOCKS_VERSION_5;
2506 s_resp->reply = SOCKS5_STATUS_REQUEST_GRANTED;
2507 s_resp->reserved = 0;
2508 s_resp->addr_type = SOCKS5_AT_IPV4;
2509 /* zero out IPv4 address and port */
2512 sizeof (struct in_addr) + sizeof (uint16_t));
2513 s5r->wbuf_len += sizeof (struct Socks5ServerResponseMessage) +
2514 sizeof (struct in_addr) + sizeof (uint16_t);
2515 if (NULL == s5r->wtask)
2517 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2524 * Process GNS results for target domain.
2526 * @param cls the `struct Socks5Request *`
2527 * @param rd_count number of records returned
2528 * @param rd record data
2531 handle_gns_result (void *cls,
2533 const struct GNUNET_GNSRECORD_Data *rd)
2535 struct Socks5Request *s5r = cls;
2537 const struct GNUNET_GNSRECORD_Data *r;
2540 s5r->gns_lookup = NULL;
2542 for (i=0;i<rd_count;i++)
2545 switch (r->record_type)
2547 case GNUNET_DNSPARSER_TYPE_A:
2549 struct sockaddr_in *in;
2551 if (sizeof (struct in_addr) != r->data_size)
2553 GNUNET_break_op (0);
2556 if (GNUNET_YES == got_ip)
2559 GNUNET_NETWORK_test_pf (PF_INET))
2561 got_ip = GNUNET_YES;
2562 in = (struct sockaddr_in *) &s5r->destination_address;
2563 in->sin_family = AF_INET;
2564 GNUNET_memcpy (&in->sin_addr,
2567 in->sin_port = htons (s5r->port);
2568 #if HAVE_SOCKADDR_IN_SIN_LEN
2569 in->sin_len = sizeof (*in);
2573 case GNUNET_DNSPARSER_TYPE_AAAA:
2575 struct sockaddr_in6 *in;
2577 if (sizeof (struct in6_addr) != r->data_size)
2579 GNUNET_break_op (0);
2582 if (GNUNET_YES == got_ip)
2585 GNUNET_NETWORK_test_pf (PF_INET))
2587 /* FIXME: allow user to disable IPv6 per configuration option... */
2588 got_ip = GNUNET_YES;
2589 in = (struct sockaddr_in6 *) &s5r->destination_address;
2590 in->sin6_family = AF_INET6;
2591 GNUNET_memcpy (&in->sin6_addr,
2594 in->sin6_port = htons (s5r->port);
2595 #if HAVE_SOCKADDR_IN_SIN_LEN
2596 in->sin6_len = sizeof (*in);
2600 case GNUNET_GNSRECORD_TYPE_VPN:
2601 GNUNET_break (0); /* should have been translated within GNS */
2603 case GNUNET_GNSRECORD_TYPE_LEHO:
2604 GNUNET_free_non_null (s5r->leho);
2605 s5r->leho = GNUNET_strndup (r->data,
2608 case GNUNET_GNSRECORD_TYPE_BOX:
2610 const struct GNUNET_GNSRECORD_BoxRecord *box;
2612 if (r->data_size < sizeof (struct GNUNET_GNSRECORD_BoxRecord))
2614 GNUNET_break_op (0);
2618 if ( (ntohl (box->record_type) != GNUNET_DNSPARSER_TYPE_TLSA) ||
2619 (ntohs (box->protocol) != IPPROTO_TCP) ||
2620 (ntohs (box->service) != s5r->port) )
2621 break; /* BOX record does not apply */
2622 GNUNET_free_non_null (s5r->dane_data);
2623 s5r->dane_data_len = r->data_size - sizeof (struct GNUNET_GNSRECORD_BoxRecord);
2624 s5r->dane_data = GNUNET_malloc (s5r->dane_data_len);
2625 GNUNET_memcpy (s5r->dane_data,
2627 s5r->dane_data_len);
2635 if (GNUNET_YES != got_ip)
2637 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2638 "Name resolution failed to yield useful IP address.\n");
2639 signal_socks_failure (s5r,
2640 SOCKS5_STATUS_GENERAL_FAILURE);
2643 s5r->state = SOCKS5_DATA_TRANSFER;
2644 signal_socks_success (s5r);
2649 * Remove the first @a len bytes from the beginning of the read buffer.
2651 * @param s5r the handle clear the read buffer for
2652 * @param len number of bytes in read buffer to advance
2655 clear_from_s5r_rbuf (struct Socks5Request *s5r,
2658 GNUNET_assert (len <= s5r->rbuf_len);
2661 s5r->rbuf_len - len);
2662 s5r->rbuf_len -= len;
2667 * Read data from incoming Socks5 connection
2669 * @param cls the closure with the `struct Socks5Request`
2672 do_s5r_read (void *cls)
2674 struct Socks5Request *s5r = cls;
2675 const struct Socks5ClientHelloMessage *c_hello;
2676 struct Socks5ServerHelloMessage *s_hello;
2677 const struct Socks5ClientRequestMessage *c_req;
2680 const struct GNUNET_SCHEDULER_TaskContext *tc;
2683 tc = GNUNET_SCHEDULER_get_task_context ();
2684 if ( (NULL != tc->read_ready) &&
2685 (GNUNET_NETWORK_fdset_isset (tc->read_ready, s5r->sock)) )
2687 rlen = GNUNET_NETWORK_socket_recv (s5r->sock,
2688 &s5r->rbuf[s5r->rbuf_len],
2689 sizeof (s5r->rbuf) - s5r->rbuf_len);
2692 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2693 "socks5 client disconnected.\n");
2697 s5r->rbuf_len += rlen;
2699 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2702 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2703 "Processing %zu bytes of socks data in state %d\n",
2709 c_hello = (const struct Socks5ClientHelloMessage*) &s5r->rbuf;
2710 if ( (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage)) ||
2711 (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods) )
2712 return; /* need more data */
2713 if (SOCKS_VERSION_5 != c_hello->version)
2715 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2716 _("Unsupported socks version %d\n"),
2717 (int) c_hello->version);
2721 clear_from_s5r_rbuf (s5r,
2722 sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods);
2723 GNUNET_assert (0 == s5r->wbuf_len);
2724 s_hello = (struct Socks5ServerHelloMessage *) &s5r->wbuf;
2725 s5r->wbuf_len = sizeof (struct Socks5ServerHelloMessage);
2726 s_hello->version = SOCKS_VERSION_5;
2727 s_hello->auth_method = SOCKS_AUTH_NONE;
2728 GNUNET_assert (NULL == s5r->wtask);
2729 s5r->wtask = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2732 s5r->state = SOCKS5_REQUEST;
2734 case SOCKS5_REQUEST:
2735 c_req = (const struct Socks5ClientRequestMessage *) &s5r->rbuf;
2736 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage))
2738 switch (c_req->command)
2740 case SOCKS5_CMD_TCP_STREAM:
2744 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2745 _("Unsupported socks command %d\n"),
2746 (int) c_req->command);
2747 signal_socks_failure (s5r,
2748 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED);
2751 switch (c_req->addr_type)
2753 case SOCKS5_AT_IPV4:
2755 const struct in_addr *v4 = (const struct in_addr *) &c_req[1];
2756 const uint16_t *port = (const uint16_t *) &v4[1];
2757 struct sockaddr_in *in;
2759 s5r->port = ntohs (*port);
2760 if (HTTPS_PORT == s5r->port)
2762 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2763 _("SSL connection to plain IPv4 address requested\n"));
2764 signal_socks_failure (s5r,
2765 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE);
2768 alen = sizeof (struct in_addr);
2769 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2770 alen + sizeof (uint16_t))
2771 return; /* need more data */
2772 in = (struct sockaddr_in *) &s5r->destination_address;
2773 in->sin_family = AF_INET;
2775 in->sin_port = *port;
2776 #if HAVE_SOCKADDR_IN_SIN_LEN
2777 in->sin_len = sizeof (*in);
2779 s5r->state = SOCKS5_DATA_TRANSFER;
2782 case SOCKS5_AT_IPV6:
2784 const struct in6_addr *v6 = (const struct in6_addr *) &c_req[1];
2785 const uint16_t *port = (const uint16_t *) &v6[1];
2786 struct sockaddr_in6 *in;
2788 s5r->port = ntohs (*port);
2789 if (HTTPS_PORT == s5r->port)
2791 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2792 _("SSL connection to plain IPv4 address requested\n"));
2793 signal_socks_failure (s5r,
2794 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE);
2797 alen = sizeof (struct in6_addr);
2798 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2799 alen + sizeof (uint16_t))
2800 return; /* need more data */
2801 in = (struct sockaddr_in6 *) &s5r->destination_address;
2802 in->sin6_family = AF_INET6;
2803 in->sin6_addr = *v6;
2804 in->sin6_port = *port;
2805 #if HAVE_SOCKADDR_IN_SIN_LEN
2806 in->sin6_len = sizeof (*in);
2808 s5r->state = SOCKS5_DATA_TRANSFER;
2811 case SOCKS5_AT_DOMAINNAME:
2813 const uint8_t *dom_len;
2814 const char *dom_name;
2815 const uint16_t *port;
2817 dom_len = (const uint8_t *) &c_req[1];
2818 alen = *dom_len + 1;
2819 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2820 alen + sizeof (uint16_t))
2821 return; /* need more data */
2822 dom_name = (const char *) &dom_len[1];
2823 port = (const uint16_t*) &dom_name[*dom_len];
2824 s5r->domain = GNUNET_strndup (dom_name, *dom_len);
2825 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2826 "Requested connection is to %s:%d\n",
2829 s5r->state = SOCKS5_RESOLVING;
2830 s5r->port = ntohs (*port);
2831 s5r->gns_lookup = GNUNET_GNS_lookup (gns_handle,
2834 GNUNET_DNSPARSER_TYPE_A,
2835 GNUNET_NO /* only cached */,
2841 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2842 _("Unsupported socks address type %d\n"),
2843 (int) c_req->addr_type);
2844 signal_socks_failure (s5r,
2845 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED);
2848 clear_from_s5r_rbuf (s5r,
2849 sizeof (struct Socks5ClientRequestMessage) +
2850 alen + sizeof (uint16_t));
2851 if (0 != s5r->rbuf_len)
2853 /* read more bytes than healthy, why did the client send more!? */
2854 GNUNET_break_op (0);
2855 signal_socks_failure (s5r,
2856 SOCKS5_STATUS_GENERAL_FAILURE);
2859 if (SOCKS5_DATA_TRANSFER == s5r->state)
2861 /* if we are not waiting for GNS resolution, signal success */
2862 signal_socks_success (s5r);
2864 /* We are done reading right now */
2865 GNUNET_SCHEDULER_cancel (s5r->rtask);
2868 case SOCKS5_RESOLVING:
2871 case SOCKS5_DATA_TRANSFER:
2882 * Accept new incoming connections
2884 * @param cls the closure with the lsock4 or lsock6
2885 * @param tc the scheduler context
2888 do_accept (void *cls)
2890 struct GNUNET_NETWORK_Handle *lsock = cls;
2891 struct GNUNET_NETWORK_Handle *s;
2892 struct Socks5Request *s5r;
2894 if (lsock == lsock4)
2898 if (lsock == lsock4)
2899 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2903 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2906 s = GNUNET_NETWORK_socket_accept (lsock, NULL, NULL);
2909 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "accept");
2912 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2913 "Got an inbound connection, waiting for data\n");
2914 s5r = GNUNET_new (struct Socks5Request);
2915 GNUNET_CONTAINER_DLL_insert (s5r_head,
2919 s5r->state = SOCKS5_INIT;
2920 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2926 /* ******************* General / main code ********************* */
2930 * Task run on shutdown
2932 * @param cls closure
2935 do_shutdown (void *cls)
2937 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2938 "Shutting down...\n");
2939 while (NULL != mhd_httpd_head)
2940 kill_httpd (mhd_httpd_head);
2941 while (NULL != s5r_head)
2942 cleanup_s5r (s5r_head);
2945 GNUNET_NETWORK_socket_close (lsock4);
2950 GNUNET_NETWORK_socket_close (lsock6);
2955 GNUNET_IDENTITY_cancel (id_op);
2958 if (NULL != identity)
2960 GNUNET_IDENTITY_disconnect (identity);
2963 if (NULL != curl_multi)
2965 curl_multi_cleanup (curl_multi);
2968 if (NULL != gns_handle)
2970 GNUNET_GNS_disconnect (gns_handle);
2973 if (NULL != curl_download_task)
2975 GNUNET_SCHEDULER_cancel (curl_download_task);
2976 curl_download_task = NULL;
2980 GNUNET_SCHEDULER_cancel (ltask4);
2985 GNUNET_SCHEDULER_cancel (ltask6);
2988 gnutls_x509_crt_deinit (proxy_ca.cert);
2989 gnutls_x509_privkey_deinit (proxy_ca.key);
2990 gnutls_global_deinit ();
2995 * Create an IPv4 listen socket bound to our port.
2997 * @return NULL on error
2999 static struct GNUNET_NETWORK_Handle *
3002 struct GNUNET_NETWORK_Handle *ls;
3003 struct sockaddr_in sa4;
3006 memset (&sa4, 0, sizeof (sa4));
3007 sa4.sin_family = AF_INET;
3008 sa4.sin_port = htons (port);
3009 #if HAVE_SOCKADDR_IN_SIN_LEN
3010 sa4.sin_len = sizeof (sa4);
3012 ls = GNUNET_NETWORK_socket_create (AF_INET,
3018 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa4,
3022 GNUNET_NETWORK_socket_close (ls);
3031 * Create an IPv6 listen socket bound to our port.
3033 * @return NULL on error
3035 static struct GNUNET_NETWORK_Handle *
3038 struct GNUNET_NETWORK_Handle *ls;
3039 struct sockaddr_in6 sa6;
3042 memset (&sa6, 0, sizeof (sa6));
3043 sa6.sin6_family = AF_INET6;
3044 sa6.sin6_port = htons (port);
3045 #if HAVE_SOCKADDR_IN_SIN_LEN
3046 sa6.sin6_len = sizeof (sa6);
3048 ls = GNUNET_NETWORK_socket_create (AF_INET6,
3054 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa6,
3058 GNUNET_NETWORK_socket_close (ls);
3067 * Continue initialization after we have our zone information.
3072 struct MhdHttpList *hd;
3074 /* Open listen socket for socks proxy */
3075 lsock6 = bind_v6 ();
3077 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
3080 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock6, 5))
3082 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
3083 GNUNET_NETWORK_socket_close (lsock6);
3088 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3089 lsock6, &do_accept, lsock6);
3092 lsock4 = bind_v4 ();
3094 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
3097 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock4, 5))
3099 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
3100 GNUNET_NETWORK_socket_close (lsock4);
3105 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3106 lsock4, &do_accept, lsock4);
3109 if ( (NULL == lsock4) &&
3112 GNUNET_SCHEDULER_shutdown ();
3115 if (0 != curl_global_init (CURL_GLOBAL_WIN32))
3117 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3118 "cURL global init failed!\n");
3119 GNUNET_SCHEDULER_shutdown ();
3122 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3123 "Proxy listens on port %llu\n",
3126 /* start MHD daemon for HTTP */
3127 hd = GNUNET_new (struct MhdHttpList);
3128 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_NO_LISTEN_SOCKET,
3131 &create_response, hd,
3132 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
3133 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
3134 MHD_OPTION_NOTIFY_CONNECTION, &mhd_connection_cb, NULL,
3135 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
3137 if (NULL == hd->daemon)
3140 GNUNET_SCHEDULER_shutdown ();
3144 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head, mhd_httpd_tail, hd);
3149 * Method called to inform about the egos of the master zone of this peer.
3151 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
3152 * this function is only called ONCE, and 'NULL' being passed in
3153 * @a ego does indicate an error (i.e. name is taken or no default
3154 * value is known). If @a ego is non-NULL and if '*ctx'
3155 * is set in those callbacks, the value WILL be passed to a subsequent
3156 * call to the identity callback of #GNUNET_IDENTITY_connect (if
3157 * that one was not NULL).
3159 * @param cls closure, NULL
3160 * @param ego ego handle
3161 * @param ctx context for application to store data for this ego
3162 * (during the lifetime of this process, initially NULL)
3163 * @param name name assigned by the user for this ego,
3164 * NULL if the user just deleted the ego and it
3165 * must thus no longer be used
3168 identity_master_cb (void *cls,
3169 struct GNUNET_IDENTITY_Ego *ego,
3176 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3177 _("No ego configured for `%s`\n"),
3179 GNUNET_SCHEDULER_shutdown ();
3182 GNUNET_IDENTITY_ego_get_public_key (ego,
3189 * Main function that will be run
3191 * @param cls closure
3192 * @param args remaining command-line arguments
3193 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
3194 * @param c configuration
3199 const char *cfgfile,
3200 const struct GNUNET_CONFIGURATION_Handle *c)
3202 char* cafile_cfg = NULL;
3207 if (NULL == (curl_multi = curl_multi_init ()))
3209 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3210 "Failed to create cURL multi handle!\n");
3213 cafile = cafile_opt;
3216 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "gns-proxy",
3220 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
3225 cafile = cafile_cfg;
3227 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3228 "Using %s as CA\n", cafile);
3230 gnutls_global_init ();
3231 gnutls_x509_crt_init (&proxy_ca.cert);
3232 gnutls_x509_privkey_init (&proxy_ca.key);
3234 if ( (GNUNET_OK != load_cert_from_file (proxy_ca.cert, cafile)) ||
3235 (GNUNET_OK != load_key_from_file (proxy_ca.key, cafile)) )
3237 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3238 _("Failed to load SSL/TLS key and certificate from `%s'\n"),
3240 gnutls_x509_crt_deinit (proxy_ca.cert);
3241 gnutls_x509_privkey_deinit (proxy_ca.key);
3242 gnutls_global_deinit ();
3243 GNUNET_free_non_null (cafile_cfg);
3246 GNUNET_free_non_null (cafile_cfg);
3247 if (NULL == (gns_handle = GNUNET_GNS_connect (cfg)))
3249 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3250 "Unable to connect to GNS!\n");
3251 gnutls_x509_crt_deinit (proxy_ca.cert);
3252 gnutls_x509_privkey_deinit (proxy_ca.key);
3253 gnutls_global_deinit ();
3256 identity = GNUNET_IDENTITY_connect (cfg,
3258 id_op = GNUNET_IDENTITY_get (identity,
3260 &identity_master_cb,
3262 GNUNET_SCHEDULER_add_shutdown (&do_shutdown, NULL);
3267 * The main function for gnunet-gns-proxy.
3269 * @param argc number of arguments from the command line
3270 * @param argv command line arguments
3271 * @return 0 ok, 1 on error
3274 main (int argc, char *const *argv)
3276 struct GNUNET_GETOPT_CommandLineOption options[] = {
3278 GNUNET_GETOPT_option_ulong ('p',
3281 gettext_noop ("listen on specified port (default: 7777)"),
3284 GNUNET_GETOPT_option_string ('a',
3287 gettext_noop ("pem file to use as CA"),
3290 GNUNET_GETOPT_OPTION_END
3292 static const char* page =
3293 "<html><head><title>gnunet-gns-proxy</title>"
3294 "</head><body>cURL fail</body></html>";
3297 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv,
3300 GNUNET_log_setup ("gnunet-gns-proxy",
3303 curl_failure_response
3304 = MHD_create_response_from_buffer (strlen (page),
3306 MHD_RESPMEM_PERSISTENT);
3310 GNUNET_PROGRAM_run (argc, argv,
3312 _("GNUnet GNS proxy"),
3314 &run, NULL)) ? 0 : 1;
3315 MHD_destroy_response (curl_failure_response);
3316 GNUNET_free_non_null ((char *) argv);
3320 /* end of gnunet-gns-proxy.c */