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
435 * A structure for socks requests
443 struct Socks5Request *next;
448 struct Socks5Request *prev;
453 struct GNUNET_NETWORK_Handle *sock;
456 * Handle to GNS lookup, during #SOCKS5_RESOLVING phase.
458 struct GNUNET_GNS_LookupRequest *gns_lookup;
461 * Client socket read task
463 struct GNUNET_SCHEDULER_Task * rtask;
466 * Client socket write task
468 struct GNUNET_SCHEDULER_Task * wtask;
473 struct GNUNET_SCHEDULER_Task * timeout_task;
478 char rbuf[SOCKS_BUFFERSIZE];
483 char wbuf[SOCKS_BUFFERSIZE];
486 * Buffer we use for moving data between MHD and curl (in both directions).
488 char io_buf[IO_BUFFERSIZE];
491 * MHD HTTP instance handling this request, NULL for none.
493 struct MhdHttpList *hd;
496 * MHD response object for this request.
498 struct MHD_Response *response;
501 * the domain name to server (only important for SSL)
506 * DNS Legacy Host Name as given by GNS, NULL if not given.
511 * Payload of the (last) DANE record encountered.
526 * HTTP request headers for the curl request.
528 struct curl_slist *headers;
531 * DNS->IP mappings resolved through GNS
533 struct curl_slist *hosts;
536 * HTTP response code to give to MHD for the response.
538 unsigned int response_code;
541 * Number of bytes in @e dane_data.
543 size_t dane_data_len;
546 * Number of bytes already in read buffer
551 * Number of bytes already in write buffer
556 * Number of bytes already in the IO buffer.
561 * Once known, what's the target address for the connection?
563 struct sockaddr_storage destination_address;
568 enum SocksPhase state;
571 * Desired destination port.
579 /* *********************** Globals **************************** */
583 * The port the proxy is running on (default 7777)
585 static unsigned long port = GNUNET_GNS_PROXY_PORT;
588 * The CA file (pem) to use for the proxy CA
590 static char *cafile_opt;
593 * The listen socket of the proxy for IPv4
595 static struct GNUNET_NETWORK_Handle *lsock4;
598 * The listen socket of the proxy for IPv6
600 static struct GNUNET_NETWORK_Handle *lsock6;
603 * The listen task ID for IPv4
605 static struct GNUNET_SCHEDULER_Task * ltask4;
608 * The listen task ID for IPv6
610 static struct GNUNET_SCHEDULER_Task * ltask6;
613 * The cURL download task (curl multi API).
615 static struct GNUNET_SCHEDULER_Task * curl_download_task;
618 * The cURL multi handle
620 static CURLM *curl_multi;
623 * Handle to the GNS service
625 static struct GNUNET_GNS_Handle *gns_handle;
628 * DLL for http/https daemons
630 static struct MhdHttpList *mhd_httpd_head;
633 * DLL for http/https daemons
635 static struct MhdHttpList *mhd_httpd_tail;
638 * Daemon for HTTP (we have one per SSL certificate, and then one for
639 * all HTTP connections; this is the one for HTTP, not HTTPS).
641 static struct MhdHttpList *httpd;
644 * DLL of active socks requests.
646 static struct Socks5Request *s5r_head;
649 * DLL of active socks requests.
651 static struct Socks5Request *s5r_tail;
654 * The users local GNS master zone
656 static struct GNUNET_CRYPTO_EcdsaPublicKey local_gns_zone;
659 * The users local shorten zone
661 static struct GNUNET_CRYPTO_EcdsaPrivateKey local_shorten_zone;
664 * Is shortening enabled?
666 static int do_shorten;
669 * The CA for SSL certificate generation
671 static struct ProxyCA proxy_ca;
674 * Response we return on cURL failures.
676 static struct MHD_Response *curl_failure_response;
679 * Connection to identity service.
681 static struct GNUNET_IDENTITY_Handle *identity;
684 * Request for our ego.
686 static struct GNUNET_IDENTITY_Operation *id_op;
691 static const struct GNUNET_CONFIGURATION_Handle *cfg;
694 /* ************************* Global helpers ********************* */
698 * Run MHD now, we have extra data ready for the callback.
700 * @param hd the daemon to run now.
703 run_mhd_now (struct MhdHttpList *hd);
707 * Clean up s5r handles.
709 * @param s5r the handle to destroy
712 cleanup_s5r (struct Socks5Request *s5r)
714 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
715 "Cleaning up socks request\n");
716 if (NULL != s5r->curl)
718 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
719 "Cleaning up cURL handle\n");
720 curl_multi_remove_handle (curl_multi, s5r->curl);
721 curl_easy_cleanup (s5r->curl);
724 curl_slist_free_all (s5r->headers);
725 if (NULL != s5r->hosts)
727 curl_slist_free_all (s5r->hosts);
729 if ( (NULL != s5r->response) &&
730 (curl_failure_response != s5r->response) )
731 MHD_destroy_response (s5r->response);
732 if (NULL != s5r->rtask)
733 GNUNET_SCHEDULER_cancel (s5r->rtask);
734 if (NULL != s5r->timeout_task)
735 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
736 if (NULL != s5r->wtask)
737 GNUNET_SCHEDULER_cancel (s5r->wtask);
738 if (NULL != s5r->gns_lookup)
739 GNUNET_GNS_lookup_cancel (s5r->gns_lookup);
740 if (NULL != s5r->sock)
742 if (SOCKS5_SOCKET_WITH_MHD <= s5r->state)
743 GNUNET_NETWORK_socket_free_memory_only_ (s5r->sock);
745 GNUNET_NETWORK_socket_close (s5r->sock);
747 GNUNET_CONTAINER_DLL_remove (s5r_head,
750 GNUNET_free_non_null (s5r->domain);
751 GNUNET_free_non_null (s5r->leho);
752 GNUNET_free_non_null (s5r->url);
753 GNUNET_free_non_null (s5r->dane_data);
758 /* ************************* HTTP handling with cURL *********************** */
762 * Callback for MHD response generation. This function is called from
763 * MHD whenever MHD expects to get data back. Copies data from the
764 * io_buf, if available.
766 * @param cls closure with our `struct Socks5Request`
767 * @param pos in buffer
768 * @param buf where to copy data
769 * @param max available space in @a buf
770 * @return number of bytes written to @a buf
773 mhd_content_cb (void *cls,
778 struct Socks5Request *s5r = cls;
779 size_t bytes_to_copy;
781 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
782 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
784 /* we're still not done with the upload, do not yet
785 start the download, the IO buffer is still full
787 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
788 "Pausing MHD download, not yet ready for download\n");
789 return 0; /* not yet ready for data download */
791 bytes_to_copy = GNUNET_MIN (max,
793 if ( (0 == bytes_to_copy) &&
794 (SOCKS5_SOCKET_DOWNLOAD_DONE != s5r->state) )
796 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
797 "Pausing MHD download, no data available\n");
798 return 0; /* more data later */
800 if ( (0 == bytes_to_copy) &&
801 (SOCKS5_SOCKET_DOWNLOAD_DONE == s5r->state) )
803 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
804 "Completed MHD download\n");
805 return MHD_CONTENT_READER_END_OF_STREAM;
807 GNUNET_memcpy (buf, s5r->io_buf, bytes_to_copy);
808 memmove (s5r->io_buf,
809 &s5r->io_buf[bytes_to_copy],
810 s5r->io_len - bytes_to_copy);
811 s5r->io_len -= bytes_to_copy;
812 if (NULL != s5r->curl)
813 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
814 return bytes_to_copy;
819 * Check that the website has presented us with a valid SSL certificate.
820 * The certificate must either match the domain name or the LEHO name
821 * (or, if available, the TLSA record).
823 * @param s5r request to check for.
824 * @return #GNUNET_OK if the certificate is valid
827 check_ssl_certificate (struct Socks5Request *s5r)
829 unsigned int cert_list_size;
830 const gnutls_datum_t *chainp;
831 const struct curl_tlssessioninfo *tlsinfo;
832 char certdn[GNUNET_DNSPARSER_MAX_NAME_LENGTH + 3];
834 gnutls_x509_crt_t x509_cert;
839 curl_easy_getinfo (s5r->curl,
840 CURLINFO_TLS_SESSION,
841 (struct curl_slist **) &tlsinfo))
842 return GNUNET_SYSERR;
843 if (CURLSSLBACKEND_GNUTLS != tlsinfo->backend)
845 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
846 _("Unsupported CURL SSL backend %d\n"),
848 return GNUNET_SYSERR;
850 chainp = gnutls_certificate_get_peers (tlsinfo->internals, &cert_list_size);
851 if ( (! chainp) || (0 == cert_list_size) )
852 return GNUNET_SYSERR;
854 size = sizeof (certdn);
855 /* initialize an X.509 certificate structure. */
856 gnutls_x509_crt_init (&x509_cert);
857 gnutls_x509_crt_import (x509_cert,
859 GNUTLS_X509_FMT_DER);
861 if (0 != (rc = gnutls_x509_crt_get_dn_by_oid (x509_cert,
862 GNUTLS_OID_X520_COMMON_NAME,
863 0, /* the first and only one */
864 0 /* no DER encoding */,
868 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
869 _("Failed to fetch CN from cert: %s\n"),
870 gnutls_strerror(rc));
871 gnutls_x509_crt_deinit (x509_cert);
872 return GNUNET_SYSERR;
874 /* check for TLSA/DANE records */
876 if (NULL != s5r->dane_data)
878 char *dd[] = { s5r->dane_data, NULL };
879 int dlen[] = { s5r->dane_data_len, 0};
880 dane_state_t dane_state;
881 dane_query_t dane_query;
884 /* FIXME: add flags to gnutls to NOT read UNBOUND_ROOT_KEY_FILE here! */
885 if (0 != (rc = dane_state_init (&dane_state,
886 #ifdef DANE_F_IGNORE_DNSSEC
887 DANE_F_IGNORE_DNSSEC |
889 DANE_F_IGNORE_LOCAL_RESOLVER)))
891 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
892 _("Failed to initialize DANE: %s\n"),
894 gnutls_x509_crt_deinit (x509_cert);
895 return GNUNET_SYSERR;
897 if (0 != (rc = dane_raw_tlsa (dane_state,
904 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
905 _("Failed to parse DANE record: %s\n"),
907 dane_state_deinit (dane_state);
908 gnutls_x509_crt_deinit (x509_cert);
909 return GNUNET_SYSERR;
911 if (0 != (rc = dane_verify_crt_raw (dane_state,
914 gnutls_certificate_type_get (tlsinfo->internals),
919 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
920 _("Failed to verify TLS connection using DANE: %s\n"),
922 dane_query_deinit (dane_query);
923 dane_state_deinit (dane_state);
924 gnutls_x509_crt_deinit (x509_cert);
925 return GNUNET_SYSERR;
929 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
930 _("Failed DANE verification failed with GnuTLS verify status code: %u\n"),
932 dane_query_deinit (dane_query);
933 dane_state_deinit (dane_state);
934 gnutls_x509_crt_deinit (x509_cert);
935 return GNUNET_SYSERR;
937 dane_query_deinit (dane_query);
938 dane_state_deinit (dane_state);
944 /* try LEHO or ordinary domain name X509 verification */
946 if (NULL != s5r->leho)
950 if (0 == (rc = gnutls_x509_crt_check_hostname (x509_cert,
953 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
954 _("SSL certificate subject name (%s) does not match `%s'\n"),
957 gnutls_x509_crt_deinit (x509_cert);
958 return GNUNET_SYSERR;
963 /* we did not even have the domain name!? */
965 return GNUNET_SYSERR;
968 gnutls_x509_crt_deinit (x509_cert);
974 * We're getting an HTTP response header from cURL. Convert it to the
975 * MHD response headers. Mostly copies the headers, but makes special
976 * adjustments to "Set-Cookie" and "Location" headers as those may need
977 * to be changed from the LEHO to the domain the browser expects.
979 * @param buffer curl buffer with a single line of header data; not 0-terminated!
980 * @param size curl blocksize
981 * @param nmemb curl blocknumber
982 * @param cls our `struct Socks5Request *`
983 * @return size of processed bytes
986 curl_check_hdr (void *buffer, size_t size, size_t nmemb, void *cls)
988 struct Socks5Request *s5r = cls;
989 size_t bytes = size * nmemb;
991 const char *hdr_type;
992 const char *cookie_domain;
995 char *new_cookie_hdr;
998 size_t delta_cdomain;
1002 if (NULL == s5r->response)
1004 /* first, check SSL certificate */
1005 if ( (HTTPS_PORT == s5r->port) &&
1006 (GNUNET_OK != check_ssl_certificate (s5r)) )
1009 GNUNET_break (CURLE_OK ==
1010 curl_easy_getinfo (s5r->curl,
1011 CURLINFO_RESPONSE_CODE,
1013 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1014 "Creating MHD response with code %d\n",
1016 s5r->response_code = resp_code;
1017 s5r->response = MHD_create_response_from_callback (MHD_SIZE_UNKNOWN,
1022 if (NULL != s5r->leho)
1026 GNUNET_asprintf (&cors_hdr,
1027 (HTTPS_PORT == s5r->port)
1032 GNUNET_break (MHD_YES ==
1033 MHD_add_response_header (s5r->response,
1034 MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN,
1036 GNUNET_free (cors_hdr);
1038 /* force connection to be closed after each request, as we
1039 do not support HTTP pipelining (yet, FIXME!) */
1040 /*GNUNET_break (MHD_YES ==
1041 MHD_add_response_header (s5r->response,
1042 MHD_HTTP_HEADER_CONNECTION,
1046 ndup = GNUNET_strndup (buffer, bytes);
1047 hdr_type = strtok (ndup, ":");
1048 if (NULL == hdr_type)
1053 hdr_val = strtok (NULL, "");
1054 if (NULL == hdr_val)
1059 if (' ' == *hdr_val)
1062 /* custom logic for certain header types */
1063 new_cookie_hdr = NULL;
1064 if ( (NULL != s5r->leho) &&
1065 (0 == strcasecmp (hdr_type,
1066 MHD_HTTP_HEADER_SET_COOKIE)) )
1069 new_cookie_hdr = GNUNET_malloc (strlen (hdr_val) +
1070 strlen (s5r->domain) + 1);
1072 domain_matched = GNUNET_NO; /* make sure we match domain at most once */
1073 for (tok = strtok (hdr_val, ";"); NULL != tok; tok = strtok (NULL, ";"))
1075 if ( (0 == strncasecmp (tok, " domain", strlen (" domain"))) &&
1076 (GNUNET_NO == domain_matched) )
1078 domain_matched = GNUNET_YES;
1079 cookie_domain = tok + strlen (" domain") + 1;
1080 if (strlen (cookie_domain) < strlen (s5r->leho))
1082 delta_cdomain = strlen (s5r->leho) - strlen (cookie_domain);
1083 if (0 == strcasecmp (cookie_domain, s5r->leho + delta_cdomain))
1085 offset += sprintf (new_cookie_hdr + offset,
1091 else if (0 == strcmp (cookie_domain, s5r->leho))
1093 offset += sprintf (new_cookie_hdr + offset,
1098 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1099 _("Cookie domain `%s' supplied by server is invalid\n"),
1102 GNUNET_memcpy (new_cookie_hdr + offset, tok, strlen (tok));
1103 offset += strlen (tok);
1104 new_cookie_hdr[offset++] = ';';
1106 hdr_val = new_cookie_hdr;
1109 new_location = NULL;
1110 if (0 == strcasecmp (MHD_HTTP_HEADER_LOCATION, hdr_type))
1114 GNUNET_asprintf (&leho_host,
1115 (HTTPS_PORT != s5r->port)
1119 if (0 == strncmp (leho_host,
1121 strlen (leho_host)))
1123 GNUNET_asprintf (&new_location,
1125 (HTTPS_PORT != s5r->port)
1129 hdr_val + strlen (leho_host));
1130 hdr_val = new_location;
1132 GNUNET_free (leho_host);
1134 /* MHD does not allow certain characters in values, remove those */
1135 if (NULL != (tok = strchr (hdr_val, '\n')))
1137 if (NULL != (tok = strchr (hdr_val, '\r')))
1139 if (NULL != (tok = strchr (hdr_val, '\t')))
1141 if ((0 != strlen (hdr_val) ) &&
1142 (0 != strcasecmp (MHD_HTTP_HEADER_CONTENT_LENGTH, hdr_type)))
1144 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1145 "Adding header %s: %s to MHD response\n",
1148 GNUNET_break (MHD_YES ==
1149 MHD_add_response_header (s5r->response,
1154 GNUNET_free_non_null (new_cookie_hdr);
1155 GNUNET_free_non_null (new_location);
1161 * Handle response payload data from cURL. Copies it into our `io_buf` to make
1162 * it available to MHD.
1164 * @param ptr pointer to the data
1165 * @param size number of blocks of data
1166 * @param nmemb blocksize
1167 * @param ctx our `struct Socks5Request *`
1168 * @return number of bytes handled
1171 curl_download_cb (void *ptr, size_t size, size_t nmemb, void* ctx)
1173 struct Socks5Request *s5r = ctx;
1174 size_t total = size * nmemb;
1176 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
1177 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1179 /* we're still not done with the upload, do not yet
1180 start the download, the IO buffer is still full
1181 with upload data. */
1182 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1183 "Pausing CURL download, waiting for UPLOAD to finish\n");
1184 return CURL_WRITEFUNC_PAUSE; /* not yet ready for data download */
1186 if (sizeof (s5r->io_buf) - s5r->io_len < total)
1188 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1189 "Pausing CURL download, not enough space\n");
1190 return CURL_WRITEFUNC_PAUSE; /* not enough space */
1192 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
1195 s5r->io_len += total;
1196 if (s5r->io_len == total)
1197 run_mhd_now (s5r->hd);
1203 * cURL callback for uploaded (PUT/POST) data. Copies it into our `io_buf`
1204 * to make it available to MHD.
1206 * @param buf where to write the data
1207 * @param size number of bytes per member
1208 * @param nmemb number of members available in @a buf
1209 * @param cls our `struct Socks5Request` that generated the data
1210 * @return number of bytes copied to @a buf
1213 curl_upload_cb (void *buf, size_t size, size_t nmemb, void *cls)
1215 struct Socks5Request *s5r = cls;
1216 size_t len = size * nmemb;
1219 if ( (0 == s5r->io_len) &&
1220 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1222 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1223 "Pausing CURL UPLOAD, need more data\n");
1224 return CURL_READFUNC_PAUSE;
1226 if ( (0 == s5r->io_len) &&
1227 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1229 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1230 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1231 "Completed CURL UPLOAD\n");
1232 return 0; /* upload finished, can now download */
1234 if ( (SOCKS5_SOCKET_UPLOAD_STARTED != s5r->state) &&
1235 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1238 return CURL_READFUNC_ABORT;
1240 to_copy = GNUNET_MIN (s5r->io_len,
1242 GNUNET_memcpy (buf, s5r->io_buf, to_copy);
1243 memmove (s5r->io_buf,
1244 &s5r->io_buf[to_copy],
1245 s5r->io_len - to_copy);
1246 s5r->io_len -= to_copy;
1247 if (s5r->io_len + to_copy == sizeof (s5r->io_buf))
1248 run_mhd_now (s5r->hd); /* got more space for upload now */
1253 /* ************************** main loop of cURL interaction ****************** */
1257 * Task that is run when we are ready to receive more data
1260 * @param cls closure
1263 curl_task_download (void *cls);
1267 * Ask cURL for the select() sets and schedule cURL operations.
1270 curl_download_prepare ()
1277 struct GNUNET_NETWORK_FDSet *grs;
1278 struct GNUNET_NETWORK_FDSet *gws;
1280 struct GNUNET_TIME_Relative rtime;
1282 if (NULL != curl_download_task)
1284 GNUNET_SCHEDULER_cancel (curl_download_task);
1285 curl_download_task = NULL;
1291 if (CURLM_OK != (mret = curl_multi_fdset (curl_multi, &rs, &ws, &es, &max)))
1293 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1294 "%s failed at %s:%d: `%s'\n",
1295 "curl_multi_fdset", __FILE__, __LINE__,
1296 curl_multi_strerror (mret));
1300 GNUNET_break (CURLM_OK == curl_multi_timeout (curl_multi, &to));
1302 rtime = GNUNET_TIME_UNIT_FOREVER_REL;
1304 rtime = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, to);
1307 grs = GNUNET_NETWORK_fdset_create ();
1308 gws = GNUNET_NETWORK_fdset_create ();
1309 GNUNET_NETWORK_fdset_copy_native (grs, &rs, max + 1);
1310 GNUNET_NETWORK_fdset_copy_native (gws, &ws, max + 1);
1311 curl_download_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1314 &curl_task_download, curl_multi);
1315 GNUNET_NETWORK_fdset_destroy (gws);
1316 GNUNET_NETWORK_fdset_destroy (grs);
1320 curl_download_task = GNUNET_SCHEDULER_add_delayed (rtime,
1321 &curl_task_download,
1328 * Task that is run when we are ready to receive more data from curl.
1330 * @param cls closure, NULL
1333 curl_task_download (void *cls)
1337 struct CURLMsg *msg;
1339 struct Socks5Request *s5r;
1341 curl_download_task = NULL;
1345 mret = curl_multi_perform (curl_multi, &running);
1346 while (NULL != (msg = curl_multi_info_read (curl_multi, &msgnum)))
1348 GNUNET_break (CURLE_OK ==
1349 curl_easy_getinfo (msg->easy_handle,
1360 /* documentation says this is not used */
1364 switch (msg->data.result)
1367 case CURLE_GOT_NOTHING:
1368 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1369 "CURL download completed.\n");
1370 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1371 run_mhd_now (s5r->hd);
1374 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1375 "Download curl failed: %s\n",
1376 curl_easy_strerror (msg->data.result));
1377 /* FIXME: indicate error somehow? close MHD connection badly as well? */
1378 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1379 run_mhd_now (s5r->hd);
1382 if (NULL == s5r->response)
1383 s5r->response = curl_failure_response;
1386 /* documentation says this is not used */
1390 /* unexpected status code */
1395 } while (mret == CURLM_CALL_MULTI_PERFORM);
1396 if (CURLM_OK != mret)
1397 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1398 "%s failed at %s:%d: `%s'\n",
1399 "curl_multi_perform", __FILE__, __LINE__,
1400 curl_multi_strerror (mret));
1403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1404 "Suspending cURL multi loop, no more events pending\n");
1405 return; /* nothing more in progress */
1407 curl_download_prepare ();
1411 /* ********************************* MHD response generation ******************* */
1415 * Read HTTP request header field from the request. Copies the fields
1416 * over to the 'headers' that will be given to curl. However, 'Host'
1417 * is substituted with the LEHO if present. We also change the
1418 * 'Connection' header value to "close" as the proxy does not support
1421 * @param cls our `struct Socks5Request`
1422 * @param kind value kind
1423 * @param key field key
1424 * @param value field value
1425 * @return MHD_YES to continue to iterate
1428 con_val_iter (void *cls,
1429 enum MHD_ValueKind kind,
1433 struct Socks5Request *s5r = cls;
1436 if ( (0 == strcasecmp (MHD_HTTP_HEADER_HOST, key)) &&
1437 (NULL != s5r->leho) )
1439 if (0 == strcasecmp (MHD_HTTP_HEADER_CONTENT_LENGTH, key))
1441 if (0 == strcasecmp (MHD_HTTP_HEADER_ACCEPT_ENCODING, key))
1443 GNUNET_asprintf (&hdr,
1447 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1448 "Adding HEADER `%s' to HTTP request\n",
1450 s5r->headers = curl_slist_append (s5r->headers,
1458 * Main MHD callback for handling requests.
1461 * @param con MHD connection handle
1462 * @param url the url in the request
1463 * @param meth the HTTP method used ("GET", "PUT", etc.)
1464 * @param ver the HTTP version string (i.e. "HTTP/1.1")
1465 * @param upload_data the data being uploaded (excluding HEADERS,
1466 * for a POST that fits into memory and that is encoded
1467 * with a supported encoding, the POST data will NOT be
1468 * given in upload_data and is instead available as
1469 * part of MHD_get_connection_values; very large POST
1470 * data *will* be made available incrementally in
1472 * @param upload_data_size set initially to the size of the
1473 * @a upload_data provided; the method must update this
1474 * value to the number of bytes NOT processed;
1475 * @param con_cls pointer to location where we store the 'struct Request'
1476 * @return MHD_YES if the connection was handled successfully,
1477 * MHD_NO if the socket must be closed due to a serious
1478 * error while handling the request
1481 create_response (void *cls,
1482 struct MHD_Connection *con,
1486 const char *upload_data,
1487 size_t *upload_data_size,
1490 struct Socks5Request *s5r = *con_cls;
1493 char ipstring[INET6_ADDRSTRLEN];
1494 char ipaddr[INET6_ADDRSTRLEN + 2];
1495 const struct sockaddr *sa;
1496 const struct sockaddr_in *s4;
1497 const struct sockaddr_in6 *s6;
1507 if (SOCKS5_SOCKET_WITH_MHD == s5r->state)
1509 /* first time here, initialize curl handle */
1510 sa = (const struct sockaddr *) &s5r->destination_address;
1511 switch (sa->sa_family)
1514 s4 = (const struct sockaddr_in *) &s5r->destination_address;
1515 if (NULL == inet_ntop (AF_INET,
1523 GNUNET_snprintf (ipaddr,
1527 port = ntohs (s4->sin_port);
1530 s6 = (const struct sockaddr_in6 *) &s5r->destination_address;
1531 if (NULL == inet_ntop (AF_INET6,
1539 GNUNET_snprintf (ipaddr,
1543 port = ntohs (s6->sin6_port);
1549 if (NULL == s5r->curl)
1550 s5r->curl = curl_easy_init ();
1551 if (NULL == s5r->curl)
1552 return MHD_queue_response (con,
1553 MHD_HTTP_INTERNAL_SERVER_ERROR,
1554 curl_failure_response);
1555 curl_easy_setopt (s5r->curl, CURLOPT_HEADERFUNCTION, &curl_check_hdr);
1556 curl_easy_setopt (s5r->curl, CURLOPT_HEADERDATA, s5r);
1557 curl_easy_setopt (s5r->curl, CURLOPT_FOLLOWLOCATION, 0);
1558 curl_easy_setopt (s5r->curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
1559 curl_easy_setopt (s5r->curl, CURLOPT_CONNECTTIMEOUT, 600L);
1560 curl_easy_setopt (s5r->curl, CURLOPT_TIMEOUT, 600L);
1561 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1562 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_CONTENT_DECODING, 0);
1563 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_TRANSFER_DECODING, 0);
1564 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1565 curl_easy_setopt (s5r->curl, CURLOPT_PRIVATE, s5r);
1566 curl_easy_setopt (s5r->curl, CURLOPT_VERBOSE, 0);
1568 * Pre-populate cache to resolve Hostname.
1569 * This is necessary as the DNS name in the CURLOPT_URL is used
1570 * for SNI http://de.wikipedia.org/wiki/Server_Name_Indication
1572 if (NULL != s5r->leho)
1574 GNUNET_asprintf (&curl_hosts,
1579 s5r->hosts = curl_slist_append(NULL, curl_hosts);
1580 curl_easy_setopt(s5r->curl, CURLOPT_RESOLVE, s5r->hosts);
1581 GNUNET_free (curl_hosts);
1583 GNUNET_asprintf (&curlurl,
1584 (HTTPS_PORT != s5r->port)
1586 : "https://%s:%d%s",
1592 curl_easy_setopt (s5r->curl,
1595 GNUNET_free (curlurl);
1596 if (0 == strcasecmp (meth, MHD_HTTP_METHOD_PUT))
1598 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1599 curl_easy_setopt (s5r->curl, CURLOPT_UPLOAD, 1);
1600 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1601 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1602 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1603 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1605 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_POST))
1607 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1608 curl_easy_setopt (s5r->curl, CURLOPT_POST, 1);
1609 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1610 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1611 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1612 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1614 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_HEAD))
1616 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1617 curl_easy_setopt (s5r->curl, CURLOPT_NOBODY, 1);
1619 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_OPTIONS))
1621 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1622 curl_easy_setopt (s5r->curl, CURLOPT_CUSTOMREQUEST, "OPTIONS");
1624 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_GET))
1626 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1627 curl_easy_setopt (s5r->curl, CURLOPT_HTTPGET, 1);
1628 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1629 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1633 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1634 _("Unsupported HTTP method `%s'\n"),
1636 curl_easy_cleanup (s5r->curl);
1641 if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_0))
1643 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
1645 else if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_1))
1647 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
1651 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_NONE);
1654 if (HTTPS_PORT == s5r->port)
1656 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);
1657 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYPEER, 1L);
1658 /* Disable cURL checking the hostname, as we will check ourselves
1659 as only we have the domain name or the LEHO or the DANE record */
1660 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYHOST, 0L);
1664 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_NONE);
1667 if (CURLM_OK != curl_multi_add_handle (curl_multi, s5r->curl))
1670 curl_easy_cleanup (s5r->curl);
1674 MHD_get_connection_values (con,
1676 &con_val_iter, s5r);
1677 //TODO is this sane? Basically we disable cURLs built-in expect:
1679 //s5r->headers = curl_slist_append (s5r->headers,
1681 curl_easy_setopt (s5r->curl, CURLOPT_HTTPHEADER, s5r->headers);
1682 curl_download_prepare ();
1686 /* continuing to process request */
1687 if (0 != *upload_data_size)
1689 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1690 "Processing %lu bytes UPLOAD\n", *upload_data_size);
1691 left = GNUNET_MIN (*upload_data_size,
1692 sizeof (s5r->io_buf) - s5r->io_len);
1693 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
1696 s5r->io_len += left;
1697 *upload_data_size -= left;
1698 GNUNET_assert (NULL != s5r->curl);
1699 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
1700 curl_download_prepare ();
1703 if (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state)
1705 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1706 "Finished processing UPLOAD\n");
1707 s5r->state = SOCKS5_SOCKET_UPLOAD_DONE;
1709 if (NULL == s5r->response)
1710 return MHD_YES; /* too early to queue response, did not yet get headers from cURL */
1711 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1712 "Queueing response with MHD\n");
1713 run_mhd_now (s5r->hd);
1714 return MHD_queue_response (con,
1720 /* ******************** MHD HTTP setup and event loop ******************** */
1724 * Function called when MHD decides that we are done with a request.
1727 * @param connection connection handle
1728 * @param con_cls value as set by the last call to
1729 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
1730 * @param toe reason for request termination (ignored)
1733 mhd_completed_cb (void *cls,
1734 struct MHD_Connection *connection,
1736 enum MHD_RequestTerminationCode toe)
1738 struct Socks5Request *s5r = *con_cls;
1742 if (MHD_REQUEST_TERMINATED_COMPLETED_OK != toe)
1743 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1744 "MHD encountered error handling request: %d\n",
1746 if (NULL != s5r->curl)
1748 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1749 "Resetting cURL handle\n");
1750 curl_multi_remove_handle (curl_multi, s5r->curl);
1751 curl_slist_free_all (s5r->headers);
1752 s5r->headers = NULL;
1753 curl_easy_reset (s5r->curl);
1758 if ( (NULL != s5r->response) &&
1759 (curl_failure_response != s5r->response) )
1760 MHD_destroy_response (s5r->response);
1761 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Finished request for %s\n", s5r->url);
1762 GNUNET_free (s5r->url);
1763 s5r->state = SOCKS5_SOCKET_WITH_MHD;
1765 s5r->response = NULL;
1771 * Function called when MHD connection is opened or closed.
1774 * @param connection connection handle
1775 * @param con_cls value as set by the last call to
1776 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
1777 * @param toe connection notification type
1780 mhd_connection_cb (void *cls,
1781 struct MHD_Connection *connection,
1783 enum MHD_ConnectionNotificationCode cnc)
1785 struct Socks5Request *s5r;
1786 const union MHD_ConnectionInfo *ci;
1789 if (MHD_CONNECTION_NOTIFY_STARTED == cnc)
1790 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection started...\n");
1792 if (MHD_CONNECTION_NOTIFY_CLOSED != cnc)
1794 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection closed... cleaning up\n");
1796 ci = MHD_get_connection_info (connection,
1797 MHD_CONNECTION_INFO_CONNECTION_FD);
1804 sock = ci->connect_fd;
1805 for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
1806 if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
1811 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Connection stale!\n");
1815 curl_download_prepare ();
1820 * Function called when MHD first processes an incoming connection.
1821 * Gives us the respective URI information.
1823 * We use this to associate the `struct MHD_Connection` with our
1824 * internal `struct Socks5Request` data structure (by checking
1825 * for matching sockets).
1827 * @param cls the HTTP server handle (a `struct MhdHttpList`)
1828 * @param url the URL that is being requested
1829 * @param connection MHD connection object for the request
1830 * @return the `struct Socks5Request` that this @a connection is for
1833 mhd_log_callback (void *cls,
1835 struct MHD_Connection *connection)
1837 struct Socks5Request *s5r;
1838 const union MHD_ConnectionInfo *ci;
1841 ci = MHD_get_connection_info (connection,
1842 MHD_CONNECTION_INFO_CONNECTION_FD);
1843 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Processing %s\n", url);
1849 sock = ci->connect_fd;
1850 for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
1852 if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
1854 if (NULL != s5r->url)
1859 s5r->url = GNUNET_strdup (url);
1860 if (NULL != s5r->timeout_task)
1861 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
1862 s5r->timeout_task = NULL;
1863 GNUNET_assert (s5r->state == SOCKS5_SOCKET_WITH_MHD);
1873 * Kill the given MHD daemon.
1875 * @param hd daemon to stop
1878 kill_httpd (struct MhdHttpList *hd)
1880 GNUNET_CONTAINER_DLL_remove (mhd_httpd_head,
1883 GNUNET_free_non_null (hd->domain);
1884 MHD_stop_daemon (hd->daemon);
1885 if (NULL != hd->httpd_task)
1887 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1888 hd->httpd_task = NULL;
1890 GNUNET_free_non_null (hd->proxy_cert);
1898 * Task run whenever HTTP server is idle for too long. Kill it.
1900 * @param cls the `struct MhdHttpList *`
1903 kill_httpd_task (void *cls)
1905 struct MhdHttpList *hd = cls;
1907 hd->httpd_task = NULL;
1913 * Task run whenever HTTP server operations are pending.
1915 * @param cls the `struct MhdHttpList *` of the daemon that is being run
1918 do_httpd (void *cls);
1922 * Schedule MHD. This function should be called initially when an
1923 * MHD is first getting its client socket, and will then automatically
1924 * always be called later whenever there is work to be done.
1926 * @param hd the daemon to schedule
1929 schedule_httpd (struct MhdHttpList *hd)
1934 struct GNUNET_NETWORK_FDSet *wrs;
1935 struct GNUNET_NETWORK_FDSet *wws;
1938 MHD_UNSIGNED_LONG_LONG timeout;
1939 struct GNUNET_TIME_Relative tv;
1945 if (MHD_YES != MHD_get_fdset (hd->daemon, &rs, &ws, &es, &max))
1950 haveto = MHD_get_timeout (hd->daemon, &timeout);
1951 if (MHD_YES == haveto)
1952 tv.rel_value_us = (uint64_t) timeout * 1000LL;
1954 tv = GNUNET_TIME_UNIT_FOREVER_REL;
1957 wrs = GNUNET_NETWORK_fdset_create ();
1958 wws = GNUNET_NETWORK_fdset_create ();
1959 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
1960 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
1967 if (NULL != hd->httpd_task)
1968 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1969 if ( (MHD_YES != haveto) &&
1973 /* daemon is idle, kill after timeout */
1974 hd->httpd_task = GNUNET_SCHEDULER_add_delayed (MHD_CACHE_TIMEOUT,
1981 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1986 GNUNET_NETWORK_fdset_destroy (wrs);
1988 GNUNET_NETWORK_fdset_destroy (wws);
1993 * Task run whenever HTTP server operations are pending.
1995 * @param cls the `struct MhdHttpList` of the daemon that is being run
1998 do_httpd (void *cls)
2000 struct MhdHttpList *hd = cls;
2002 hd->httpd_task = NULL;
2003 MHD_run (hd->daemon);
2004 schedule_httpd (hd);
2009 * Run MHD now, we have extra data ready for the callback.
2011 * @param hd the daemon to run now.
2014 run_mhd_now (struct MhdHttpList *hd)
2018 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2019 hd->httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd,
2025 * Read file in filename
2027 * @param filename file to read
2028 * @param size pointer where filesize is stored
2029 * @return NULL on error
2032 load_file (const char* filename,
2039 GNUNET_DISK_file_size (filename, &fsize,
2040 GNUNET_YES, GNUNET_YES))
2042 if (fsize > MAX_PEM_SIZE)
2044 *size = (unsigned int) fsize;
2045 buffer = GNUNET_malloc (*size);
2046 if (fsize != GNUNET_DISK_fn_read (filename, buffer, (size_t) fsize))
2048 GNUNET_free (buffer);
2056 * Load PEM key from file
2058 * @param key where to store the data
2059 * @param keyfile path to the PEM file
2060 * @return #GNUNET_OK on success
2063 load_key_from_file (gnutls_x509_privkey_t key,
2064 const char* keyfile)
2066 gnutls_datum_t key_data;
2069 key_data.data = load_file (keyfile, &key_data.size);
2070 if (NULL == key_data.data)
2071 return GNUNET_SYSERR;
2072 ret = gnutls_x509_privkey_import (key, &key_data,
2073 GNUTLS_X509_FMT_PEM);
2074 if (GNUTLS_E_SUCCESS != ret)
2076 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2077 _("Unable to import private key from file `%s'\n"),
2080 GNUNET_free_non_null (key_data.data);
2081 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2086 * Load cert from file
2088 * @param crt struct to store data in
2089 * @param certfile path to pem file
2090 * @return #GNUNET_OK on success
2093 load_cert_from_file (gnutls_x509_crt_t crt,
2094 const char* certfile)
2096 gnutls_datum_t cert_data;
2099 cert_data.data = load_file (certfile, &cert_data.size);
2100 if (NULL == cert_data.data)
2101 return GNUNET_SYSERR;
2102 ret = gnutls_x509_crt_import (crt, &cert_data,
2103 GNUTLS_X509_FMT_PEM);
2104 if (GNUTLS_E_SUCCESS != ret)
2106 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2107 _("Unable to import certificate %s\n"), certfile);
2109 GNUNET_free_non_null (cert_data.data);
2110 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2115 * Generate new certificate for specific name
2117 * @param name the subject name to generate a cert for
2118 * @return a struct holding the PEM data, NULL on error
2120 static struct ProxyGNSCertificate *
2121 generate_gns_certificate (const char *name)
2123 unsigned int serial;
2124 size_t key_buf_size;
2125 size_t cert_buf_size;
2126 gnutls_x509_crt_t request;
2129 struct ProxyGNSCertificate *pgc;
2131 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2132 "Generating TLS/SSL certificate for `%s'\n",
2134 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_init (&request));
2135 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_key (request, proxy_ca.key));
2136 pgc = GNUNET_new (struct ProxyGNSCertificate);
2137 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COUNTRY_NAME,
2139 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_ORGANIZATION_NAME,
2140 0, "GNU Name System", 4);
2141 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COMMON_NAME,
2142 0, name, strlen (name));
2143 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_version (request, 3));
2144 gnutls_rnd (GNUTLS_RND_NONCE, &serial, sizeof (serial));
2145 gnutls_x509_crt_set_serial (request,
2148 etime = time (NULL);
2149 tm_data = localtime (&etime);
2150 gnutls_x509_crt_set_activation_time (request,
2153 etime = mktime (tm_data);
2154 gnutls_x509_crt_set_expiration_time (request,
2156 gnutls_x509_crt_sign (request,
2159 key_buf_size = sizeof (pgc->key);
2160 cert_buf_size = sizeof (pgc->cert);
2161 gnutls_x509_crt_export (request, GNUTLS_X509_FMT_PEM,
2162 pgc->cert, &cert_buf_size);
2163 gnutls_x509_privkey_export (proxy_ca.key, GNUTLS_X509_FMT_PEM,
2164 pgc->key, &key_buf_size);
2165 gnutls_x509_crt_deinit (request);
2171 * Function called by MHD with errors, suppresses them all.
2173 * @param cls closure
2174 * @param fm format string (`printf()`-style)
2175 * @param ap arguments to @a fm
2178 mhd_error_log_callback (void *cls,
2187 * Lookup (or create) an SSL MHD instance for a particular domain.
2189 * @param domain the domain the SSL daemon has to serve
2190 * @return NULL on error
2192 static struct MhdHttpList *
2193 lookup_ssl_httpd (const char* domain)
2195 struct MhdHttpList *hd;
2196 struct ProxyGNSCertificate *pgc;
2203 for (hd = mhd_httpd_head; NULL != hd; hd = hd->next)
2204 if ( (NULL != hd->domain) &&
2205 (0 == strcmp (hd->domain, domain)) )
2207 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2208 "Starting fresh MHD HTTPS instance for domain `%s'\n",
2210 pgc = generate_gns_certificate (domain);
2211 hd = GNUNET_new (struct MhdHttpList);
2212 hd->is_ssl = GNUNET_YES;
2213 hd->domain = GNUNET_strdup (domain);
2214 hd->proxy_cert = pgc;
2215 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_SSL | MHD_USE_NO_LISTEN_SOCKET,
2218 &create_response, hd,
2219 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
2220 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
2221 MHD_OPTION_NOTIFY_CONNECTION, &mhd_connection_cb, NULL,
2222 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
2223 MHD_OPTION_EXTERNAL_LOGGER, &mhd_error_log_callback, NULL,
2224 MHD_OPTION_HTTPS_MEM_KEY, pgc->key,
2225 MHD_OPTION_HTTPS_MEM_CERT, pgc->cert,
2227 if (NULL == hd->daemon)
2233 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
2241 * Task run when a Socks5Request somehow fails to be associated with
2242 * an MHD connection (i.e. because the client never speaks HTTP after
2243 * the SOCKS5 handshake). Clean up.
2245 * @param cls the `struct Socks5Request *`
2248 timeout_s5r_handshake (void *cls)
2250 struct Socks5Request *s5r = cls;
2252 s5r->timeout_task = NULL;
2258 * We're done with the Socks5 protocol, now we need to pass the
2259 * connection data through to the final destination, either
2260 * direct (if the protocol might not be HTTP), or via MHD
2261 * (if the port looks like it should be HTTP).
2263 * @param s5r socks request that has reached the final stage
2266 setup_data_transfer (struct Socks5Request *s5r)
2268 struct MhdHttpList *hd;
2270 const struct sockaddr *addr;
2276 hd = lookup_ssl_httpd (s5r->domain);
2279 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2280 _("Failed to start HTTPS server for `%s'\n"),
2288 GNUNET_assert (NULL != httpd);
2292 fd = GNUNET_NETWORK_get_fd (s5r->sock);
2293 addr = GNUNET_NETWORK_get_addr (s5r->sock);
2294 len = GNUNET_NETWORK_get_addrlen (s5r->sock);
2295 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2296 if (MHD_YES != MHD_add_connection (hd->daemon, fd, addr, len))
2298 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2299 _("Failed to pass client to MHD\n"));
2304 schedule_httpd (hd);
2305 s5r->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_HANDSHAKE_TIMEOUT,
2306 &timeout_s5r_handshake,
2311 /* ********************* SOCKS handling ************************* */
2315 * Write data from buffer to socks5 client, then continue with state machine.
2317 * @param cls the closure with the `struct Socks5Request`
2320 do_write (void *cls)
2322 struct Socks5Request *s5r = cls;
2326 len = GNUNET_NETWORK_socket_send (s5r->sock,
2331 /* write error: connection closed, shutdown, etc.; just clean up */
2337 s5r->wbuf_len - len);
2338 s5r->wbuf_len -= len;
2339 if (s5r->wbuf_len > 0)
2341 /* not done writing */
2343 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2349 /* we're done writing, continue with state machine! */
2356 case SOCKS5_REQUEST:
2357 GNUNET_assert (NULL != s5r->rtask);
2359 case SOCKS5_DATA_TRANSFER:
2360 setup_data_transfer (s5r);
2362 case SOCKS5_WRITE_THEN_CLEANUP:
2373 * Return a server response message indicating a failure to the client.
2375 * @param s5r request to return failure code for
2376 * @param sc status code to return
2379 signal_socks_failure (struct Socks5Request *s5r,
2380 enum Socks5StatusCode sc)
2382 struct Socks5ServerResponseMessage *s_resp;
2384 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2385 memset (s_resp, 0, sizeof (struct Socks5ServerResponseMessage));
2386 s_resp->version = SOCKS_VERSION_5;
2388 s5r->state = SOCKS5_WRITE_THEN_CLEANUP;
2389 if (NULL != s5r->wtask)
2391 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2398 * Return a server response message indicating success.
2400 * @param s5r request to return success status message for
2403 signal_socks_success (struct Socks5Request *s5r)
2405 struct Socks5ServerResponseMessage *s_resp;
2407 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2408 s_resp->version = SOCKS_VERSION_5;
2409 s_resp->reply = SOCKS5_STATUS_REQUEST_GRANTED;
2410 s_resp->reserved = 0;
2411 s_resp->addr_type = SOCKS5_AT_IPV4;
2412 /* zero out IPv4 address and port */
2415 sizeof (struct in_addr) + sizeof (uint16_t));
2416 s5r->wbuf_len += sizeof (struct Socks5ServerResponseMessage) +
2417 sizeof (struct in_addr) + sizeof (uint16_t);
2418 if (NULL == s5r->wtask)
2420 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2427 * Process GNS results for target domain.
2429 * @param cls the `struct Socks5Request *`
2430 * @param rd_count number of records returned
2431 * @param rd record data
2434 handle_gns_result (void *cls,
2436 const struct GNUNET_GNSRECORD_Data *rd)
2438 struct Socks5Request *s5r = cls;
2440 const struct GNUNET_GNSRECORD_Data *r;
2443 s5r->gns_lookup = NULL;
2445 for (i=0;i<rd_count;i++)
2448 switch (r->record_type)
2450 case GNUNET_DNSPARSER_TYPE_A:
2452 struct sockaddr_in *in;
2454 if (sizeof (struct in_addr) != r->data_size)
2456 GNUNET_break_op (0);
2459 if (GNUNET_YES == got_ip)
2462 GNUNET_NETWORK_test_pf (PF_INET))
2464 got_ip = GNUNET_YES;
2465 in = (struct sockaddr_in *) &s5r->destination_address;
2466 in->sin_family = AF_INET;
2467 GNUNET_memcpy (&in->sin_addr,
2470 in->sin_port = htons (s5r->port);
2471 #if HAVE_SOCKADDR_IN_SIN_LEN
2472 in->sin_len = sizeof (*in);
2476 case GNUNET_DNSPARSER_TYPE_AAAA:
2478 struct sockaddr_in6 *in;
2480 if (sizeof (struct in6_addr) != r->data_size)
2482 GNUNET_break_op (0);
2485 if (GNUNET_YES == got_ip)
2488 GNUNET_NETWORK_test_pf (PF_INET))
2490 /* FIXME: allow user to disable IPv6 per configuration option... */
2491 got_ip = GNUNET_YES;
2492 in = (struct sockaddr_in6 *) &s5r->destination_address;
2493 in->sin6_family = AF_INET6;
2494 GNUNET_memcpy (&in->sin6_addr,
2497 in->sin6_port = htons (s5r->port);
2498 #if HAVE_SOCKADDR_IN_SIN_LEN
2499 in->sin6_len = sizeof (*in);
2503 case GNUNET_GNSRECORD_TYPE_VPN:
2504 GNUNET_break (0); /* should have been translated within GNS */
2506 case GNUNET_GNSRECORD_TYPE_LEHO:
2507 GNUNET_free_non_null (s5r->leho);
2508 s5r->leho = GNUNET_strndup (r->data,
2511 case GNUNET_GNSRECORD_TYPE_BOX:
2513 const struct GNUNET_GNSRECORD_BoxRecord *box;
2515 if (r->data_size < sizeof (struct GNUNET_GNSRECORD_BoxRecord))
2517 GNUNET_break_op (0);
2521 if ( (ntohl (box->record_type) != GNUNET_DNSPARSER_TYPE_TLSA) ||
2522 (ntohs (box->protocol) != IPPROTO_TCP) ||
2523 (ntohs (box->service) != s5r->port) )
2524 break; /* BOX record does not apply */
2525 GNUNET_free_non_null (s5r->dane_data);
2526 s5r->dane_data_len = r->data_size - sizeof (struct GNUNET_GNSRECORD_BoxRecord);
2527 s5r->dane_data = GNUNET_malloc (s5r->dane_data_len);
2528 GNUNET_memcpy (s5r->dane_data,
2530 s5r->dane_data_len);
2538 if (GNUNET_YES != got_ip)
2540 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2541 "Name resolution failed to yield useful IP address.\n");
2542 signal_socks_failure (s5r,
2543 SOCKS5_STATUS_GENERAL_FAILURE);
2546 s5r->state = SOCKS5_DATA_TRANSFER;
2547 signal_socks_success (s5r);
2552 * Remove the first @a len bytes from the beginning of the read buffer.
2554 * @param s5r the handle clear the read buffer for
2555 * @param len number of bytes in read buffer to advance
2558 clear_from_s5r_rbuf (struct Socks5Request *s5r,
2561 GNUNET_assert (len <= s5r->rbuf_len);
2564 s5r->rbuf_len - len);
2565 s5r->rbuf_len -= len;
2570 * Read data from incoming Socks5 connection
2572 * @param cls the closure with the `struct Socks5Request`
2575 do_s5r_read (void *cls)
2577 struct Socks5Request *s5r = cls;
2578 const struct Socks5ClientHelloMessage *c_hello;
2579 struct Socks5ServerHelloMessage *s_hello;
2580 const struct Socks5ClientRequestMessage *c_req;
2583 const struct GNUNET_SCHEDULER_TaskContext *tc;
2586 tc = GNUNET_SCHEDULER_get_task_context ();
2587 if ( (NULL != tc->read_ready) &&
2588 (GNUNET_NETWORK_fdset_isset (tc->read_ready, s5r->sock)) )
2590 rlen = GNUNET_NETWORK_socket_recv (s5r->sock,
2591 &s5r->rbuf[s5r->rbuf_len],
2592 sizeof (s5r->rbuf) - s5r->rbuf_len);
2595 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2596 "socks5 client disconnected.\n");
2600 s5r->rbuf_len += rlen;
2602 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2605 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2606 "Processing %zu bytes of socks data in state %d\n",
2612 c_hello = (const struct Socks5ClientHelloMessage*) &s5r->rbuf;
2613 if ( (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage)) ||
2614 (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods) )
2615 return; /* need more data */
2616 if (SOCKS_VERSION_5 != c_hello->version)
2618 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2619 _("Unsupported socks version %d\n"),
2620 (int) c_hello->version);
2624 clear_from_s5r_rbuf (s5r,
2625 sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods);
2626 GNUNET_assert (0 == s5r->wbuf_len);
2627 s_hello = (struct Socks5ServerHelloMessage *) &s5r->wbuf;
2628 s5r->wbuf_len = sizeof (struct Socks5ServerHelloMessage);
2629 s_hello->version = SOCKS_VERSION_5;
2630 s_hello->auth_method = SOCKS_AUTH_NONE;
2631 GNUNET_assert (NULL == s5r->wtask);
2632 s5r->wtask = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2635 s5r->state = SOCKS5_REQUEST;
2637 case SOCKS5_REQUEST:
2638 c_req = (const struct Socks5ClientRequestMessage *) &s5r->rbuf;
2639 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage))
2641 switch (c_req->command)
2643 case SOCKS5_CMD_TCP_STREAM:
2647 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2648 _("Unsupported socks command %d\n"),
2649 (int) c_req->command);
2650 signal_socks_failure (s5r,
2651 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED);
2654 switch (c_req->addr_type)
2656 case SOCKS5_AT_IPV4:
2658 const struct in_addr *v4 = (const struct in_addr *) &c_req[1];
2659 const uint16_t *port = (const uint16_t *) &v4[1];
2660 struct sockaddr_in *in;
2662 s5r->port = ntohs (*port);
2663 if (HTTPS_PORT == s5r->port)
2665 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2666 _("SSL connection to plain IPv4 address requested\n"));
2667 signal_socks_failure (s5r,
2668 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE);
2671 alen = sizeof (struct in_addr);
2672 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2673 alen + sizeof (uint16_t))
2674 return; /* need more data */
2675 in = (struct sockaddr_in *) &s5r->destination_address;
2676 in->sin_family = AF_INET;
2678 in->sin_port = *port;
2679 #if HAVE_SOCKADDR_IN_SIN_LEN
2680 in->sin_len = sizeof (*in);
2682 s5r->state = SOCKS5_DATA_TRANSFER;
2685 case SOCKS5_AT_IPV6:
2687 const struct in6_addr *v6 = (const struct in6_addr *) &c_req[1];
2688 const uint16_t *port = (const uint16_t *) &v6[1];
2689 struct sockaddr_in6 *in;
2691 s5r->port = ntohs (*port);
2692 if (HTTPS_PORT == s5r->port)
2694 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2695 _("SSL connection to plain IPv4 address requested\n"));
2696 signal_socks_failure (s5r,
2697 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE);
2700 alen = sizeof (struct in6_addr);
2701 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2702 alen + sizeof (uint16_t))
2703 return; /* need more data */
2704 in = (struct sockaddr_in6 *) &s5r->destination_address;
2705 in->sin6_family = AF_INET6;
2706 in->sin6_addr = *v6;
2707 in->sin6_port = *port;
2708 #if HAVE_SOCKADDR_IN_SIN_LEN
2709 in->sin6_len = sizeof (*in);
2711 s5r->state = SOCKS5_DATA_TRANSFER;
2714 case SOCKS5_AT_DOMAINNAME:
2716 const uint8_t *dom_len;
2717 const char *dom_name;
2718 const uint16_t *port;
2720 dom_len = (const uint8_t *) &c_req[1];
2721 alen = *dom_len + 1;
2722 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2723 alen + sizeof (uint16_t))
2724 return; /* need more data */
2725 dom_name = (const char *) &dom_len[1];
2726 port = (const uint16_t*) &dom_name[*dom_len];
2727 s5r->domain = GNUNET_strndup (dom_name, *dom_len);
2728 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2729 "Requested connection is to %s:%d\n",
2732 s5r->state = SOCKS5_RESOLVING;
2733 s5r->port = ntohs (*port);
2734 s5r->gns_lookup = GNUNET_GNS_lookup (gns_handle,
2737 GNUNET_DNSPARSER_TYPE_A,
2738 GNUNET_NO /* only cached */,
2739 (GNUNET_YES == do_shorten) ? &local_shorten_zone : NULL,
2745 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2746 _("Unsupported socks address type %d\n"),
2747 (int) c_req->addr_type);
2748 signal_socks_failure (s5r,
2749 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED);
2752 clear_from_s5r_rbuf (s5r,
2753 sizeof (struct Socks5ClientRequestMessage) +
2754 alen + sizeof (uint16_t));
2755 if (0 != s5r->rbuf_len)
2757 /* read more bytes than healthy, why did the client send more!? */
2758 GNUNET_break_op (0);
2759 signal_socks_failure (s5r,
2760 SOCKS5_STATUS_GENERAL_FAILURE);
2763 if (SOCKS5_DATA_TRANSFER == s5r->state)
2765 /* if we are not waiting for GNS resolution, signal success */
2766 signal_socks_success (s5r);
2768 /* We are done reading right now */
2769 GNUNET_SCHEDULER_cancel (s5r->rtask);
2772 case SOCKS5_RESOLVING:
2775 case SOCKS5_DATA_TRANSFER:
2786 * Accept new incoming connections
2788 * @param cls the closure with the lsock4 or lsock6
2789 * @param tc the scheduler context
2792 do_accept (void *cls)
2794 struct GNUNET_NETWORK_Handle *lsock = cls;
2795 struct GNUNET_NETWORK_Handle *s;
2796 struct Socks5Request *s5r;
2798 if (lsock == lsock4)
2802 if (lsock == lsock4)
2803 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2807 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2810 s = GNUNET_NETWORK_socket_accept (lsock, NULL, NULL);
2813 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "accept");
2816 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2817 "Got an inbound connection, waiting for data\n");
2818 s5r = GNUNET_new (struct Socks5Request);
2819 GNUNET_CONTAINER_DLL_insert (s5r_head,
2823 s5r->state = SOCKS5_INIT;
2824 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2830 /* ******************* General / main code ********************* */
2834 * Task run on shutdown
2836 * @param cls closure
2839 do_shutdown (void *cls)
2841 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2842 "Shutting down...\n");
2843 while (NULL != mhd_httpd_head)
2844 kill_httpd (mhd_httpd_head);
2845 while (NULL != s5r_head)
2846 cleanup_s5r (s5r_head);
2849 GNUNET_NETWORK_socket_close (lsock4);
2854 GNUNET_NETWORK_socket_close (lsock6);
2859 GNUNET_IDENTITY_cancel (id_op);
2862 if (NULL != identity)
2864 GNUNET_IDENTITY_disconnect (identity);
2867 if (NULL != curl_multi)
2869 curl_multi_cleanup (curl_multi);
2872 if (NULL != gns_handle)
2874 GNUNET_GNS_disconnect (gns_handle);
2877 if (NULL != curl_download_task)
2879 GNUNET_SCHEDULER_cancel (curl_download_task);
2880 curl_download_task = NULL;
2884 GNUNET_SCHEDULER_cancel (ltask4);
2889 GNUNET_SCHEDULER_cancel (ltask6);
2892 gnutls_x509_crt_deinit (proxy_ca.cert);
2893 gnutls_x509_privkey_deinit (proxy_ca.key);
2894 gnutls_global_deinit ();
2899 * Create an IPv4 listen socket bound to our port.
2901 * @return NULL on error
2903 static struct GNUNET_NETWORK_Handle *
2906 struct GNUNET_NETWORK_Handle *ls;
2907 struct sockaddr_in sa4;
2910 memset (&sa4, 0, sizeof (sa4));
2911 sa4.sin_family = AF_INET;
2912 sa4.sin_port = htons (port);
2913 #if HAVE_SOCKADDR_IN_SIN_LEN
2914 sa4.sin_len = sizeof (sa4);
2916 ls = GNUNET_NETWORK_socket_create (AF_INET,
2922 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa4,
2926 GNUNET_NETWORK_socket_close (ls);
2935 * Create an IPv6 listen socket bound to our port.
2937 * @return NULL on error
2939 static struct GNUNET_NETWORK_Handle *
2942 struct GNUNET_NETWORK_Handle *ls;
2943 struct sockaddr_in6 sa6;
2946 memset (&sa6, 0, sizeof (sa6));
2947 sa6.sin6_family = AF_INET6;
2948 sa6.sin6_port = htons (port);
2949 #if HAVE_SOCKADDR_IN_SIN_LEN
2950 sa6.sin6_len = sizeof (sa6);
2952 ls = GNUNET_NETWORK_socket_create (AF_INET6,
2958 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa6,
2962 GNUNET_NETWORK_socket_close (ls);
2971 * Continue initialization after we have our zone information.
2976 struct MhdHttpList *hd;
2978 /* Open listen socket for socks proxy */
2979 lsock6 = bind_v6 ();
2981 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
2984 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock6, 5))
2986 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
2987 GNUNET_NETWORK_socket_close (lsock6);
2992 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2993 lsock6, &do_accept, lsock6);
2996 lsock4 = bind_v4 ();
2998 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
3001 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock4, 5))
3003 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
3004 GNUNET_NETWORK_socket_close (lsock4);
3009 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3010 lsock4, &do_accept, lsock4);
3013 if ( (NULL == lsock4) &&
3016 GNUNET_SCHEDULER_shutdown ();
3019 if (0 != curl_global_init (CURL_GLOBAL_WIN32))
3021 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3022 "cURL global init failed!\n");
3023 GNUNET_SCHEDULER_shutdown ();
3026 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3027 "Proxy listens on port %lu\n",
3030 /* start MHD daemon for HTTP */
3031 hd = GNUNET_new (struct MhdHttpList);
3032 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_NO_LISTEN_SOCKET,
3035 &create_response, hd,
3036 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
3037 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
3038 MHD_OPTION_NOTIFY_CONNECTION, &mhd_connection_cb, NULL,
3039 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
3041 if (NULL == hd->daemon)
3044 GNUNET_SCHEDULER_shutdown ();
3048 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head, mhd_httpd_tail, hd);
3053 * Method called to inform about the egos of the shorten zone of this peer.
3055 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
3056 * this function is only called ONCE, and 'NULL' being passed in
3057 * @a ego does indicate an error (i.e. name is taken or no default
3058 * value is known). If @a ego is non-NULL and if '*ctx'
3059 * is set in those callbacks, the value WILL be passed to a subsequent
3060 * call to the identity callback of #GNUNET_IDENTITY_connect (if
3061 * that one was not NULL).
3063 * @param cls closure, NULL
3064 * @param ego ego handle
3065 * @param ctx context for application to store data for this ego
3066 * (during the lifetime of this process, initially NULL)
3067 * @param name name assigned by the user for this ego,
3068 * NULL if the user just deleted the ego and it
3069 * must thus no longer be used
3072 identity_shorten_cb (void *cls,
3073 struct GNUNET_IDENTITY_Ego *ego,
3080 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3081 _("No ego configured for `shorten-zone`\n"));
3085 local_shorten_zone = *GNUNET_IDENTITY_ego_get_private_key (ego);
3086 do_shorten = GNUNET_YES;
3093 * Method called to inform about the egos of the master zone of this peer.
3095 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
3096 * this function is only called ONCE, and 'NULL' being passed in
3097 * @a ego does indicate an error (i.e. name is taken or no default
3098 * value is known). If @a ego is non-NULL and if '*ctx'
3099 * is set in those callbacks, the value WILL be passed to a subsequent
3100 * call to the identity callback of #GNUNET_IDENTITY_connect (if
3101 * that one was not NULL).
3103 * @param cls closure, NULL
3104 * @param ego ego handle
3105 * @param ctx context for application to store data for this ego
3106 * (during the lifetime of this process, initially NULL)
3107 * @param name name assigned by the user for this ego,
3108 * NULL if the user just deleted the ego and it
3109 * must thus no longer be used
3112 identity_master_cb (void *cls,
3113 struct GNUNET_IDENTITY_Ego *ego,
3120 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3121 _("No ego configured for `%s`\n"),
3123 GNUNET_SCHEDULER_shutdown ();
3126 GNUNET_IDENTITY_ego_get_public_key (ego,
3128 id_op = GNUNET_IDENTITY_get (identity,
3130 &identity_shorten_cb,
3136 * Main function that will be run
3138 * @param cls closure
3139 * @param args remaining command-line arguments
3140 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
3141 * @param c configuration
3144 run (void *cls, char *const *args, const char *cfgfile,
3145 const struct GNUNET_CONFIGURATION_Handle *c)
3147 char* cafile_cfg = NULL;
3152 if (NULL == (curl_multi = curl_multi_init ()))
3154 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3155 "Failed to create cURL multi handle!\n");
3158 cafile = cafile_opt;
3161 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "gns-proxy",
3165 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
3170 cafile = cafile_cfg;
3172 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3173 "Using %s as CA\n", cafile);
3175 gnutls_global_init ();
3176 gnutls_x509_crt_init (&proxy_ca.cert);
3177 gnutls_x509_privkey_init (&proxy_ca.key);
3179 if ( (GNUNET_OK != load_cert_from_file (proxy_ca.cert, cafile)) ||
3180 (GNUNET_OK != load_key_from_file (proxy_ca.key, cafile)) )
3182 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3183 _("Failed to load SSL/TLS key and certificate from `%s'\n"),
3185 gnutls_x509_crt_deinit (proxy_ca.cert);
3186 gnutls_x509_privkey_deinit (proxy_ca.key);
3187 gnutls_global_deinit ();
3188 GNUNET_free_non_null (cafile_cfg);
3191 GNUNET_free_non_null (cafile_cfg);
3192 if (NULL == (gns_handle = GNUNET_GNS_connect (cfg)))
3194 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3195 "Unable to connect to GNS!\n");
3196 gnutls_x509_crt_deinit (proxy_ca.cert);
3197 gnutls_x509_privkey_deinit (proxy_ca.key);
3198 gnutls_global_deinit ();
3201 identity = GNUNET_IDENTITY_connect (cfg,
3203 id_op = GNUNET_IDENTITY_get (identity,
3205 &identity_master_cb,
3207 GNUNET_SCHEDULER_add_shutdown (&do_shutdown, NULL);
3212 * The main function for gnunet-gns-proxy.
3214 * @param argc number of arguments from the command line
3215 * @param argv command line arguments
3216 * @return 0 ok, 1 on error
3219 main (int argc, char *const *argv)
3221 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
3223 gettext_noop ("listen on specified port (default: 7777)"), 1,
3224 &GNUNET_GETOPT_set_ulong, &port},
3225 {'a', "authority", NULL,
3226 gettext_noop ("pem file to use as CA"), 1,
3227 &GNUNET_GETOPT_set_string, &cafile_opt},
3228 GNUNET_GETOPT_OPTION_END
3230 static const char* page =
3231 "<html><head><title>gnunet-gns-proxy</title>"
3232 "</head><body>cURL fail</body></html>";
3235 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
3237 GNUNET_log_setup ("gnunet-gns-proxy", "WARNING", NULL);
3238 curl_failure_response = MHD_create_response_from_buffer (strlen (page),
3240 MHD_RESPMEM_PERSISTENT);
3244 GNUNET_PROGRAM_run (argc, argv, "gnunet-gns-proxy",
3245 _("GNUnet GNS proxy"),
3247 &run, NULL)) ? 0 : 1;
3248 MHD_destroy_response (curl_failure_response);
3249 GNUNET_free_non_null ((char *) argv);
3250 GNUNET_CRYPTO_ecdsa_key_clear (&local_shorten_zone);
3254 /* end of gnunet-gns-proxy.c */