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 s5r->state = SOCKS5_SOCKET_WITH_MHD;
806 return MHD_CONTENT_READER_END_OF_STREAM;
808 GNUNET_memcpy (buf, s5r->io_buf, bytes_to_copy);
809 memmove (s5r->io_buf,
810 &s5r->io_buf[bytes_to_copy],
811 s5r->io_len - bytes_to_copy);
812 s5r->io_len -= bytes_to_copy;
813 if (NULL != s5r->curl)
814 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
815 return bytes_to_copy;
820 * Check that the website has presented us with a valid SSL certificate.
821 * The certificate must either match the domain name or the LEHO name
822 * (or, if available, the TLSA record).
824 * @param s5r request to check for.
825 * @return #GNUNET_OK if the certificate is valid
828 check_ssl_certificate (struct Socks5Request *s5r)
830 unsigned int cert_list_size;
831 const gnutls_datum_t *chainp;
832 const struct curl_tlssessioninfo *tlsinfo;
833 char certdn[GNUNET_DNSPARSER_MAX_NAME_LENGTH + 3];
835 gnutls_x509_crt_t x509_cert;
840 curl_easy_getinfo (s5r->curl,
841 CURLINFO_TLS_SESSION,
842 (struct curl_slist **) &tlsinfo))
843 return GNUNET_SYSERR;
844 if (CURLSSLBACKEND_GNUTLS != tlsinfo->backend)
846 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
847 _("Unsupported CURL SSL backend %d\n"),
849 return GNUNET_SYSERR;
851 chainp = gnutls_certificate_get_peers (tlsinfo->internals, &cert_list_size);
852 if ( (! chainp) || (0 == cert_list_size) )
853 return GNUNET_SYSERR;
855 size = sizeof (certdn);
856 /* initialize an X.509 certificate structure. */
857 gnutls_x509_crt_init (&x509_cert);
858 gnutls_x509_crt_import (x509_cert,
860 GNUTLS_X509_FMT_DER);
862 if (0 != (rc = gnutls_x509_crt_get_dn_by_oid (x509_cert,
863 GNUTLS_OID_X520_COMMON_NAME,
864 0, /* the first and only one */
865 0 /* no DER encoding */,
869 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
870 _("Failed to fetch CN from cert: %s\n"),
871 gnutls_strerror(rc));
872 gnutls_x509_crt_deinit (x509_cert);
873 return GNUNET_SYSERR;
875 /* check for TLSA/DANE records */
877 if (NULL != s5r->dane_data)
879 char *dd[] = { s5r->dane_data, NULL };
880 int dlen[] = { s5r->dane_data_len, 0};
881 dane_state_t dane_state;
882 dane_query_t dane_query;
885 /* FIXME: add flags to gnutls to NOT read UNBOUND_ROOT_KEY_FILE here! */
886 if (0 != (rc = dane_state_init (&dane_state,
887 #ifdef DANE_F_IGNORE_DNSSEC
888 DANE_F_IGNORE_DNSSEC |
890 DANE_F_IGNORE_LOCAL_RESOLVER)))
892 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
893 _("Failed to initialize DANE: %s\n"),
895 gnutls_x509_crt_deinit (x509_cert);
896 return GNUNET_SYSERR;
898 if (0 != (rc = dane_raw_tlsa (dane_state,
905 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
906 _("Failed to parse DANE record: %s\n"),
908 dane_state_deinit (dane_state);
909 gnutls_x509_crt_deinit (x509_cert);
910 return GNUNET_SYSERR;
912 if (0 != (rc = dane_verify_crt_raw (dane_state,
915 gnutls_certificate_type_get (tlsinfo->internals),
920 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
921 _("Failed to verify TLS connection using DANE: %s\n"),
923 dane_query_deinit (dane_query);
924 dane_state_deinit (dane_state);
925 gnutls_x509_crt_deinit (x509_cert);
926 return GNUNET_SYSERR;
930 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
931 _("Failed DANE verification failed with GnuTLS verify status code: %u\n"),
933 dane_query_deinit (dane_query);
934 dane_state_deinit (dane_state);
935 gnutls_x509_crt_deinit (x509_cert);
936 return GNUNET_SYSERR;
938 dane_query_deinit (dane_query);
939 dane_state_deinit (dane_state);
945 /* try LEHO or ordinary domain name X509 verification */
947 if (NULL != s5r->leho)
951 if (0 == (rc = gnutls_x509_crt_check_hostname (x509_cert,
954 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
955 _("SSL certificate subject name (%s) does not match `%s'\n"),
958 gnutls_x509_crt_deinit (x509_cert);
959 return GNUNET_SYSERR;
964 /* we did not even have the domain name!? */
966 return GNUNET_SYSERR;
969 gnutls_x509_crt_deinit (x509_cert);
975 * We're getting an HTTP response header from cURL. Convert it to the
976 * MHD response headers. Mostly copies the headers, but makes special
977 * adjustments to "Set-Cookie" and "Location" headers as those may need
978 * to be changed from the LEHO to the domain the browser expects.
980 * @param buffer curl buffer with a single line of header data; not 0-terminated!
981 * @param size curl blocksize
982 * @param nmemb curl blocknumber
983 * @param cls our `struct Socks5Request *`
984 * @return size of processed bytes
987 curl_check_hdr (void *buffer, size_t size, size_t nmemb, void *cls)
989 struct Socks5Request *s5r = cls;
990 size_t bytes = size * nmemb;
992 const char *hdr_type;
993 const char *cookie_domain;
996 char *new_cookie_hdr;
999 size_t delta_cdomain;
1003 if (NULL == s5r->response)
1005 /* first, check SSL certificate */
1006 if ( (HTTPS_PORT == s5r->port) &&
1007 (GNUNET_OK != check_ssl_certificate (s5r)) )
1010 GNUNET_break (CURLE_OK ==
1011 curl_easy_getinfo (s5r->curl,
1012 CURLINFO_RESPONSE_CODE,
1014 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1015 "Creating MHD response with code %d\n",
1017 s5r->response_code = resp_code;
1018 s5r->response = MHD_create_response_from_callback (MHD_SIZE_UNKNOWN,
1023 if (NULL != s5r->leho)
1027 GNUNET_asprintf (&cors_hdr,
1028 (HTTPS_PORT == s5r->port)
1033 GNUNET_break (MHD_YES ==
1034 MHD_add_response_header (s5r->response,
1035 MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN,
1037 GNUNET_free (cors_hdr);
1039 /* force connection to be closed after each request, as we
1040 do not support HTTP pipelining (yet, FIXME!) */
1041 /*GNUNET_break (MHD_YES ==
1042 MHD_add_response_header (s5r->response,
1043 MHD_HTTP_HEADER_CONNECTION,
1047 ndup = GNUNET_strndup (buffer, bytes);
1048 hdr_type = strtok (ndup, ":");
1049 if (NULL == hdr_type)
1054 hdr_val = strtok (NULL, "");
1055 if (NULL == hdr_val)
1060 if (' ' == *hdr_val)
1063 /* custom logic for certain header types */
1064 new_cookie_hdr = NULL;
1065 if ( (NULL != s5r->leho) &&
1066 (0 == strcasecmp (hdr_type,
1067 MHD_HTTP_HEADER_SET_COOKIE)) )
1070 new_cookie_hdr = GNUNET_malloc (strlen (hdr_val) +
1071 strlen (s5r->domain) + 1);
1073 domain_matched = GNUNET_NO; /* make sure we match domain at most once */
1074 for (tok = strtok (hdr_val, ";"); NULL != tok; tok = strtok (NULL, ";"))
1076 if ( (0 == strncasecmp (tok, " domain", strlen (" domain"))) &&
1077 (GNUNET_NO == domain_matched) )
1079 domain_matched = GNUNET_YES;
1080 cookie_domain = tok + strlen (" domain") + 1;
1081 if (strlen (cookie_domain) < strlen (s5r->leho))
1083 delta_cdomain = strlen (s5r->leho) - strlen (cookie_domain);
1084 if (0 == strcasecmp (cookie_domain, s5r->leho + delta_cdomain))
1086 offset += sprintf (new_cookie_hdr + offset,
1092 else if (0 == strcmp (cookie_domain, s5r->leho))
1094 offset += sprintf (new_cookie_hdr + offset,
1099 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1100 _("Cookie domain `%s' supplied by server is invalid\n"),
1103 GNUNET_memcpy (new_cookie_hdr + offset, tok, strlen (tok));
1104 offset += strlen (tok);
1105 new_cookie_hdr[offset++] = ';';
1107 hdr_val = new_cookie_hdr;
1110 new_location = NULL;
1111 if (0 == strcasecmp (MHD_HTTP_HEADER_LOCATION, hdr_type))
1115 GNUNET_asprintf (&leho_host,
1116 (HTTPS_PORT != s5r->port)
1120 if (0 == strncmp (leho_host,
1122 strlen (leho_host)))
1124 GNUNET_asprintf (&new_location,
1126 (HTTPS_PORT != s5r->port)
1130 hdr_val + strlen (leho_host));
1131 hdr_val = new_location;
1133 GNUNET_free (leho_host);
1135 /* MHD does not allow certain characters in values, remove those */
1136 if (NULL != (tok = strchr (hdr_val, '\n')))
1138 if (NULL != (tok = strchr (hdr_val, '\r')))
1140 if (NULL != (tok = strchr (hdr_val, '\t')))
1142 if (0 != strlen (hdr_val))
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 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1383 "Cleaning up cURL handle\n");
1384 curl_multi_remove_handle (curl_multi, s5r->curl);
1385 curl_easy_cleanup (s5r->curl);
1387 if (NULL == s5r->response)
1388 s5r->response = curl_failure_response;
1391 /* documentation says this is not used */
1395 /* unexpected status code */
1400 } while (mret == CURLM_CALL_MULTI_PERFORM);
1401 if (CURLM_OK != mret)
1402 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1403 "%s failed at %s:%d: `%s'\n",
1404 "curl_multi_perform", __FILE__, __LINE__,
1405 curl_multi_strerror (mret));
1408 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1409 "Suspending cURL multi loop, no more events pending\n");
1410 return; /* nothing more in progress */
1412 curl_download_prepare ();
1416 /* ********************************* MHD response generation ******************* */
1420 * Read HTTP request header field from the request. Copies the fields
1421 * over to the 'headers' that will be given to curl. However, 'Host'
1422 * is substituted with the LEHO if present. We also change the
1423 * 'Connection' header value to "close" as the proxy does not support
1426 * @param cls our `struct Socks5Request`
1427 * @param kind value kind
1428 * @param key field key
1429 * @param value field value
1430 * @return MHD_YES to continue to iterate
1433 con_val_iter (void *cls,
1434 enum MHD_ValueKind kind,
1438 struct Socks5Request *s5r = cls;
1441 if ( (0 == strcasecmp (MHD_HTTP_HEADER_HOST, key)) &&
1442 (NULL != s5r->leho) )
1444 /*if (0 == strcasecmp (MHD_HTTP_HEADER_CONNECTION, key))
1446 GNUNET_asprintf (&hdr,
1450 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1451 "Adding HEADER `%s' to HTTP request\n",
1453 s5r->headers = curl_slist_append (s5r->headers,
1461 * Main MHD callback for handling requests.
1464 * @param con MHD connection handle
1465 * @param url the url in the request
1466 * @param meth the HTTP method used ("GET", "PUT", etc.)
1467 * @param ver the HTTP version string (i.e. "HTTP/1.1")
1468 * @param upload_data the data being uploaded (excluding HEADERS,
1469 * for a POST that fits into memory and that is encoded
1470 * with a supported encoding, the POST data will NOT be
1471 * given in upload_data and is instead available as
1472 * part of MHD_get_connection_values; very large POST
1473 * data *will* be made available incrementally in
1475 * @param upload_data_size set initially to the size of the
1476 * @a upload_data provided; the method must update this
1477 * value to the number of bytes NOT processed;
1478 * @param con_cls pointer to location where we store the 'struct Request'
1479 * @return MHD_YES if the connection was handled successfully,
1480 * MHD_NO if the socket must be closed due to a serious
1481 * error while handling the request
1484 create_response (void *cls,
1485 struct MHD_Connection *con,
1489 const char *upload_data,
1490 size_t *upload_data_size,
1493 struct Socks5Request *s5r = *con_cls;
1496 char ipstring[INET6_ADDRSTRLEN];
1497 char ipaddr[INET6_ADDRSTRLEN + 2];
1498 const struct sockaddr *sa;
1499 const struct sockaddr_in *s4;
1500 const struct sockaddr_in6 *s6;
1509 //Fresh connection. Maybe move to notify callback??
1510 if (SOCKS5_SOCKET_WITH_MHD == s5r->state)
1512 /* first time here, initialize curl handle */
1513 sa = (const struct sockaddr *) &s5r->destination_address;
1514 switch (sa->sa_family)
1517 s4 = (const struct sockaddr_in *) &s5r->destination_address;
1518 if (NULL == inet_ntop (AF_INET,
1526 GNUNET_snprintf (ipaddr,
1530 port = ntohs (s4->sin_port);
1533 s6 = (const struct sockaddr_in6 *) &s5r->destination_address;
1534 if (NULL == inet_ntop (AF_INET6,
1542 GNUNET_snprintf (ipaddr,
1546 port = ntohs (s6->sin6_port);
1552 if (NULL == s5r->curl)
1553 s5r->curl = curl_easy_init ();
1554 if (NULL == s5r->curl)
1555 return MHD_queue_response (con,
1556 MHD_HTTP_INTERNAL_SERVER_ERROR,
1557 curl_failure_response);
1558 curl_easy_setopt (s5r->curl, CURLOPT_HEADERFUNCTION, &curl_check_hdr);
1559 curl_easy_setopt (s5r->curl, CURLOPT_HEADERDATA, s5r);
1560 curl_easy_setopt (s5r->curl, CURLOPT_FOLLOWLOCATION, 0);
1561 curl_easy_setopt (s5r->curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
1562 curl_easy_setopt (s5r->curl, CURLOPT_CONNECTTIMEOUT, 600L);
1563 curl_easy_setopt (s5r->curl, CURLOPT_TIMEOUT, 600L);
1564 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1565 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_CONTENT_DECODING, 0);
1566 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_TRANSFER_DECODING, 0);
1567 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1568 curl_easy_setopt (s5r->curl, CURLOPT_PRIVATE, s5r);
1569 curl_easy_setopt (s5r->curl, CURLOPT_VERBOSE, 0);
1571 * Pre-populate cache to resolve Hostname.
1572 * This is necessary as the DNS name in the CURLOPT_URL is used
1573 * for SNI http://de.wikipedia.org/wiki/Server_Name_Indication
1575 if (NULL != s5r->leho)
1577 GNUNET_asprintf (&curl_hosts,
1582 s5r->hosts = curl_slist_append(NULL, curl_hosts);
1583 curl_easy_setopt(s5r->curl, CURLOPT_RESOLVE, s5r->hosts);
1584 GNUNET_free (curl_hosts);
1586 GNUNET_asprintf (&curlurl,
1587 (HTTPS_PORT != s5r->port)
1589 : "https://%s:%d%s",
1595 curl_easy_setopt (s5r->curl,
1598 GNUNET_free (curlurl);
1599 if (0 == strcasecmp (meth, MHD_HTTP_METHOD_PUT))
1601 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1602 curl_easy_setopt (s5r->curl, CURLOPT_UPLOAD, 1);
1603 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1604 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1605 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1606 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1608 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_POST))
1610 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1611 curl_easy_setopt (s5r->curl, CURLOPT_POST, 1);
1612 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1613 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1614 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1615 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1617 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_HEAD))
1619 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1620 curl_easy_setopt (s5r->curl, CURLOPT_NOBODY, 1);
1622 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_OPTIONS))
1624 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1625 curl_easy_setopt (s5r->curl, CURLOPT_CUSTOMREQUEST, "OPTIONS");
1627 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_GET))
1629 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1630 curl_easy_setopt (s5r->curl, CURLOPT_HTTPGET, 1);
1631 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1632 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1636 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1637 _("Unsupported HTTP method `%s'\n"),
1639 curl_easy_cleanup (s5r->curl);
1644 if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_0))
1646 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
1648 else if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_1))
1650 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
1654 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_NONE);
1657 if (HTTPS_PORT == s5r->port)
1659 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);
1660 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYPEER, 1L);
1661 /* Disable cURL checking the hostname, as we will check ourselves
1662 as only we have the domain name or the LEHO or the DANE record */
1663 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYHOST, 0L);
1667 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_NONE);
1670 if (CURLM_OK != curl_multi_add_handle (curl_multi, s5r->curl))
1673 curl_easy_cleanup (s5r->curl);
1677 MHD_get_connection_values (con,
1679 &con_val_iter, s5r);
1680 //TODO is this sane?
1681 s5r->headers = curl_slist_append (s5r->headers,
1683 curl_easy_setopt (s5r->curl, CURLOPT_HTTPHEADER, s5r->headers);
1684 curl_download_prepare ();
1688 /* continuing to process request */
1689 if (0 != *upload_data_size)
1691 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1692 "Processing %lu bytes UPLOAD\n", *upload_data_size);
1693 left = GNUNET_MIN (*upload_data_size,
1694 sizeof (s5r->io_buf) - s5r->io_len);
1695 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
1698 s5r->io_len += left;
1699 *upload_data_size -= left;
1700 GNUNET_assert (NULL != s5r->curl);
1701 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
1702 curl_download_prepare ();
1705 if (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state)
1707 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1708 "Finished processing UPLOAD\n");
1709 s5r->state = SOCKS5_SOCKET_UPLOAD_DONE;
1711 if (NULL == s5r->response)
1712 return MHD_YES; /* too early to queue response, did not yet get headers from cURL */
1713 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1714 "Queueing response with MHD\n");
1715 run_mhd_now (s5r->hd);
1716 return MHD_queue_response (con,
1722 /* ******************** MHD HTTP setup and event loop ******************** */
1726 * Function called when MHD decides that we are done with a request.
1729 * @param connection connection handle
1730 * @param con_cls value as set by the last call to
1731 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
1732 * @param toe reason for request termination (ignored)
1735 mhd_completed_cb (void *cls,
1736 struct MHD_Connection *connection,
1738 enum MHD_RequestTerminationCode toe)
1740 struct Socks5Request *s5r = *con_cls;
1744 if (MHD_REQUEST_TERMINATED_COMPLETED_OK != toe)
1745 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1746 "MHD encountered error handling request: %d\n",
1748 if (NULL != s5r->curl)
1750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1751 "Cleaning up cURL handle\n");
1752 curl_multi_remove_handle (curl_multi, s5r->curl);
1753 curl_easy_cleanup (s5r->curl);
1756 if ( (NULL != s5r->response) &&
1757 (curl_failure_response != s5r->response) )
1758 MHD_destroy_response (s5r->response);
1759 s5r->response = NULL;
1760 curl_download_prepare();
1766 * Function called when MHD connection is opened or closed.
1769 * @param connection connection handle
1770 * @param con_cls value as set by the last call to
1771 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
1772 * @param toe connection notification type
1775 mhd_connection_cb (void *cls,
1776 struct MHD_Connection *connection,
1778 enum MHD_ConnectionNotificationCode cnc)
1780 struct Socks5Request *s5r;
1781 const union MHD_ConnectionInfo *ci;
1784 if (MHD_CONNECTION_NOTIFY_STARTED == cnc)
1785 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection started...\n");
1787 if (MHD_CONNECTION_NOTIFY_CLOSED != cnc)
1789 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection closed... cleaning up\n");
1791 ci = MHD_get_connection_info (connection,
1792 MHD_CONNECTION_INFO_CONNECTION_FD);
1799 sock = ci->connect_fd;
1800 for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
1801 if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
1806 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection stale!\n");
1814 * Function called when MHD first processes an incoming connection.
1815 * Gives us the respective URI information.
1817 * We use this to associate the `struct MHD_Connection` with our
1818 * internal `struct Socks5Request` data structure (by checking
1819 * for matching sockets).
1821 * @param cls the HTTP server handle (a `struct MhdHttpList`)
1822 * @param url the URL that is being requested
1823 * @param connection MHD connection object for the request
1824 * @return the `struct Socks5Request` that this @a connection is for
1827 mhd_log_callback (void *cls,
1829 struct MHD_Connection *connection)
1831 struct Socks5Request *s5r;
1832 const union MHD_ConnectionInfo *ci;
1835 ci = MHD_get_connection_info (connection,
1836 MHD_CONNECTION_INFO_CONNECTION_FD);
1842 sock = ci->connect_fd;
1843 for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
1845 if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
1847 if (NULL != s5r->url)
1852 s5r->url = GNUNET_strdup (url);
1853 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
1854 s5r->timeout_task = NULL;
1864 * Kill the given MHD daemon.
1866 * @param hd daemon to stop
1869 kill_httpd (struct MhdHttpList *hd)
1871 GNUNET_CONTAINER_DLL_remove (mhd_httpd_head,
1874 GNUNET_free_non_null (hd->domain);
1875 MHD_stop_daemon (hd->daemon);
1876 if (NULL != hd->httpd_task)
1878 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1879 hd->httpd_task = NULL;
1881 GNUNET_free_non_null (hd->proxy_cert);
1889 * Task run whenever HTTP server is idle for too long. Kill it.
1891 * @param cls the `struct MhdHttpList *`
1894 kill_httpd_task (void *cls)
1896 struct MhdHttpList *hd = cls;
1898 hd->httpd_task = NULL;
1904 * Task run whenever HTTP server operations are pending.
1906 * @param cls the `struct MhdHttpList *` of the daemon that is being run
1909 do_httpd (void *cls);
1913 * Schedule MHD. This function should be called initially when an
1914 * MHD is first getting its client socket, and will then automatically
1915 * always be called later whenever there is work to be done.
1917 * @param hd the daemon to schedule
1920 schedule_httpd (struct MhdHttpList *hd)
1925 struct GNUNET_NETWORK_FDSet *wrs;
1926 struct GNUNET_NETWORK_FDSet *wws;
1929 MHD_UNSIGNED_LONG_LONG timeout;
1930 struct GNUNET_TIME_Relative tv;
1936 if (MHD_YES != MHD_get_fdset (hd->daemon, &rs, &ws, &es, &max))
1941 haveto = MHD_get_timeout (hd->daemon, &timeout);
1942 if (MHD_YES == haveto)
1943 tv.rel_value_us = (uint64_t) timeout * 1000LL;
1945 tv = GNUNET_TIME_UNIT_FOREVER_REL;
1948 wrs = GNUNET_NETWORK_fdset_create ();
1949 wws = GNUNET_NETWORK_fdset_create ();
1950 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
1951 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
1958 if (NULL != hd->httpd_task)
1959 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1960 if ( (MHD_YES != haveto) &&
1964 /* daemon is idle, kill after timeout */
1965 hd->httpd_task = GNUNET_SCHEDULER_add_delayed (MHD_CACHE_TIMEOUT,
1972 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1977 GNUNET_NETWORK_fdset_destroy (wrs);
1979 GNUNET_NETWORK_fdset_destroy (wws);
1984 * Task run whenever HTTP server operations are pending.
1986 * @param cls the `struct MhdHttpList` of the daemon that is being run
1989 do_httpd (void *cls)
1991 struct MhdHttpList *hd = cls;
1993 hd->httpd_task = NULL;
1994 MHD_run (hd->daemon);
1995 schedule_httpd (hd);
2000 * Run MHD now, we have extra data ready for the callback.
2002 * @param hd the daemon to run now.
2005 run_mhd_now (struct MhdHttpList *hd)
2009 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2010 hd->httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd,
2016 * Read file in filename
2018 * @param filename file to read
2019 * @param size pointer where filesize is stored
2020 * @return NULL on error
2023 load_file (const char* filename,
2030 GNUNET_DISK_file_size (filename, &fsize,
2031 GNUNET_YES, GNUNET_YES))
2033 if (fsize > MAX_PEM_SIZE)
2035 *size = (unsigned int) fsize;
2036 buffer = GNUNET_malloc (*size);
2037 if (fsize != GNUNET_DISK_fn_read (filename, buffer, (size_t) fsize))
2039 GNUNET_free (buffer);
2047 * Load PEM key from file
2049 * @param key where to store the data
2050 * @param keyfile path to the PEM file
2051 * @return #GNUNET_OK on success
2054 load_key_from_file (gnutls_x509_privkey_t key,
2055 const char* keyfile)
2057 gnutls_datum_t key_data;
2060 key_data.data = load_file (keyfile, &key_data.size);
2061 if (NULL == key_data.data)
2062 return GNUNET_SYSERR;
2063 ret = gnutls_x509_privkey_import (key, &key_data,
2064 GNUTLS_X509_FMT_PEM);
2065 if (GNUTLS_E_SUCCESS != ret)
2067 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2068 _("Unable to import private key from file `%s'\n"),
2071 GNUNET_free_non_null (key_data.data);
2072 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2077 * Load cert from file
2079 * @param crt struct to store data in
2080 * @param certfile path to pem file
2081 * @return #GNUNET_OK on success
2084 load_cert_from_file (gnutls_x509_crt_t crt,
2085 const char* certfile)
2087 gnutls_datum_t cert_data;
2090 cert_data.data = load_file (certfile, &cert_data.size);
2091 if (NULL == cert_data.data)
2092 return GNUNET_SYSERR;
2093 ret = gnutls_x509_crt_import (crt, &cert_data,
2094 GNUTLS_X509_FMT_PEM);
2095 if (GNUTLS_E_SUCCESS != ret)
2097 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2098 _("Unable to import certificate %s\n"), certfile);
2100 GNUNET_free_non_null (cert_data.data);
2101 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2106 * Generate new certificate for specific name
2108 * @param name the subject name to generate a cert for
2109 * @return a struct holding the PEM data, NULL on error
2111 static struct ProxyGNSCertificate *
2112 generate_gns_certificate (const char *name)
2114 unsigned int serial;
2115 size_t key_buf_size;
2116 size_t cert_buf_size;
2117 gnutls_x509_crt_t request;
2120 struct ProxyGNSCertificate *pgc;
2122 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2123 "Generating TLS/SSL certificate for `%s'\n",
2125 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_init (&request));
2126 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_key (request, proxy_ca.key));
2127 pgc = GNUNET_new (struct ProxyGNSCertificate);
2128 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COUNTRY_NAME,
2130 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_ORGANIZATION_NAME,
2131 0, "GNU Name System", 4);
2132 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COMMON_NAME,
2133 0, name, strlen (name));
2134 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_version (request, 3));
2135 gnutls_rnd (GNUTLS_RND_NONCE, &serial, sizeof (serial));
2136 gnutls_x509_crt_set_serial (request,
2139 etime = time (NULL);
2140 tm_data = localtime (&etime);
2141 gnutls_x509_crt_set_activation_time (request,
2144 etime = mktime (tm_data);
2145 gnutls_x509_crt_set_expiration_time (request,
2147 gnutls_x509_crt_sign (request,
2150 key_buf_size = sizeof (pgc->key);
2151 cert_buf_size = sizeof (pgc->cert);
2152 gnutls_x509_crt_export (request, GNUTLS_X509_FMT_PEM,
2153 pgc->cert, &cert_buf_size);
2154 gnutls_x509_privkey_export (proxy_ca.key, GNUTLS_X509_FMT_PEM,
2155 pgc->key, &key_buf_size);
2156 gnutls_x509_crt_deinit (request);
2162 * Function called by MHD with errors, suppresses them all.
2164 * @param cls closure
2165 * @param fm format string (`printf()`-style)
2166 * @param ap arguments to @a fm
2169 mhd_error_log_callback (void *cls,
2178 * Lookup (or create) an SSL MHD instance for a particular domain.
2180 * @param domain the domain the SSL daemon has to serve
2181 * @return NULL on error
2183 static struct MhdHttpList *
2184 lookup_ssl_httpd (const char* domain)
2186 struct MhdHttpList *hd;
2187 struct ProxyGNSCertificate *pgc;
2194 for (hd = mhd_httpd_head; NULL != hd; hd = hd->next)
2195 if ( (NULL != hd->domain) &&
2196 (0 == strcmp (hd->domain, domain)) )
2198 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2199 "Starting fresh MHD HTTPS instance for domain `%s'\n",
2201 pgc = generate_gns_certificate (domain);
2202 hd = GNUNET_new (struct MhdHttpList);
2203 hd->is_ssl = GNUNET_YES;
2204 hd->domain = GNUNET_strdup (domain);
2205 hd->proxy_cert = pgc;
2206 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_SSL | MHD_USE_NO_LISTEN_SOCKET,
2209 &create_response, hd,
2210 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
2211 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
2212 MHD_OPTION_NOTIFY_CONNECTION, &mhd_connection_cb, NULL,
2213 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
2214 MHD_OPTION_EXTERNAL_LOGGER, &mhd_error_log_callback, NULL,
2215 MHD_OPTION_HTTPS_MEM_KEY, pgc->key,
2216 MHD_OPTION_HTTPS_MEM_CERT, pgc->cert,
2218 if (NULL == hd->daemon)
2224 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
2232 * Task run when a Socks5Request somehow fails to be associated with
2233 * an MHD connection (i.e. because the client never speaks HTTP after
2234 * the SOCKS5 handshake). Clean up.
2236 * @param cls the `struct Socks5Request *`
2239 timeout_s5r_handshake (void *cls)
2241 struct Socks5Request *s5r = cls;
2243 s5r->timeout_task = NULL;
2249 * We're done with the Socks5 protocol, now we need to pass the
2250 * connection data through to the final destination, either
2251 * direct (if the protocol might not be HTTP), or via MHD
2252 * (if the port looks like it should be HTTP).
2254 * @param s5r socks request that has reached the final stage
2257 setup_data_transfer (struct Socks5Request *s5r)
2259 struct MhdHttpList *hd;
2261 const struct sockaddr *addr;
2267 hd = lookup_ssl_httpd (s5r->domain);
2270 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2271 _("Failed to start HTTPS server for `%s'\n"),
2279 GNUNET_assert (NULL != httpd);
2283 fd = GNUNET_NETWORK_get_fd (s5r->sock);
2284 addr = GNUNET_NETWORK_get_addr (s5r->sock);
2285 len = GNUNET_NETWORK_get_addrlen (s5r->sock);
2286 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2287 if (MHD_YES != MHD_add_connection (hd->daemon, fd, addr, len))
2289 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2290 _("Failed to pass client to MHD\n"));
2295 schedule_httpd (hd);
2296 s5r->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_HANDSHAKE_TIMEOUT,
2297 &timeout_s5r_handshake,
2302 /* ********************* SOCKS handling ************************* */
2306 * Write data from buffer to socks5 client, then continue with state machine.
2308 * @param cls the closure with the `struct Socks5Request`
2311 do_write (void *cls)
2313 struct Socks5Request *s5r = cls;
2317 len = GNUNET_NETWORK_socket_send (s5r->sock,
2322 /* write error: connection closed, shutdown, etc.; just clean up */
2328 s5r->wbuf_len - len);
2329 s5r->wbuf_len -= len;
2330 if (s5r->wbuf_len > 0)
2332 /* not done writing */
2334 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2340 /* we're done writing, continue with state machine! */
2347 case SOCKS5_REQUEST:
2348 GNUNET_assert (NULL != s5r->rtask);
2350 case SOCKS5_DATA_TRANSFER:
2351 setup_data_transfer (s5r);
2353 case SOCKS5_WRITE_THEN_CLEANUP:
2364 * Return a server response message indicating a failure to the client.
2366 * @param s5r request to return failure code for
2367 * @param sc status code to return
2370 signal_socks_failure (struct Socks5Request *s5r,
2371 enum Socks5StatusCode sc)
2373 struct Socks5ServerResponseMessage *s_resp;
2375 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2376 memset (s_resp, 0, sizeof (struct Socks5ServerResponseMessage));
2377 s_resp->version = SOCKS_VERSION_5;
2379 s5r->state = SOCKS5_WRITE_THEN_CLEANUP;
2380 if (NULL != s5r->wtask)
2382 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2389 * Return a server response message indicating success.
2391 * @param s5r request to return success status message for
2394 signal_socks_success (struct Socks5Request *s5r)
2396 struct Socks5ServerResponseMessage *s_resp;
2398 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2399 s_resp->version = SOCKS_VERSION_5;
2400 s_resp->reply = SOCKS5_STATUS_REQUEST_GRANTED;
2401 s_resp->reserved = 0;
2402 s_resp->addr_type = SOCKS5_AT_IPV4;
2403 /* zero out IPv4 address and port */
2406 sizeof (struct in_addr) + sizeof (uint16_t));
2407 s5r->wbuf_len += sizeof (struct Socks5ServerResponseMessage) +
2408 sizeof (struct in_addr) + sizeof (uint16_t);
2409 if (NULL == s5r->wtask)
2411 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2418 * Process GNS results for target domain.
2420 * @param cls the `struct Socks5Request *`
2421 * @param rd_count number of records returned
2422 * @param rd record data
2425 handle_gns_result (void *cls,
2427 const struct GNUNET_GNSRECORD_Data *rd)
2429 struct Socks5Request *s5r = cls;
2431 const struct GNUNET_GNSRECORD_Data *r;
2434 s5r->gns_lookup = NULL;
2436 for (i=0;i<rd_count;i++)
2439 switch (r->record_type)
2441 case GNUNET_DNSPARSER_TYPE_A:
2443 struct sockaddr_in *in;
2445 if (sizeof (struct in_addr) != r->data_size)
2447 GNUNET_break_op (0);
2450 if (GNUNET_YES == got_ip)
2453 GNUNET_NETWORK_test_pf (PF_INET))
2455 got_ip = GNUNET_YES;
2456 in = (struct sockaddr_in *) &s5r->destination_address;
2457 in->sin_family = AF_INET;
2458 GNUNET_memcpy (&in->sin_addr,
2461 in->sin_port = htons (s5r->port);
2462 #if HAVE_SOCKADDR_IN_SIN_LEN
2463 in->sin_len = sizeof (*in);
2467 case GNUNET_DNSPARSER_TYPE_AAAA:
2469 struct sockaddr_in6 *in;
2471 if (sizeof (struct in6_addr) != r->data_size)
2473 GNUNET_break_op (0);
2476 if (GNUNET_YES == got_ip)
2479 GNUNET_NETWORK_test_pf (PF_INET))
2481 /* FIXME: allow user to disable IPv6 per configuration option... */
2482 got_ip = GNUNET_YES;
2483 in = (struct sockaddr_in6 *) &s5r->destination_address;
2484 in->sin6_family = AF_INET6;
2485 GNUNET_memcpy (&in->sin6_addr,
2488 in->sin6_port = htons (s5r->port);
2489 #if HAVE_SOCKADDR_IN_SIN_LEN
2490 in->sin6_len = sizeof (*in);
2494 case GNUNET_GNSRECORD_TYPE_VPN:
2495 GNUNET_break (0); /* should have been translated within GNS */
2497 case GNUNET_GNSRECORD_TYPE_LEHO:
2498 GNUNET_free_non_null (s5r->leho);
2499 s5r->leho = GNUNET_strndup (r->data,
2502 case GNUNET_GNSRECORD_TYPE_BOX:
2504 const struct GNUNET_GNSRECORD_BoxRecord *box;
2506 if (r->data_size < sizeof (struct GNUNET_GNSRECORD_BoxRecord))
2508 GNUNET_break_op (0);
2512 if ( (ntohl (box->record_type) != GNUNET_DNSPARSER_TYPE_TLSA) ||
2513 (ntohs (box->protocol) != IPPROTO_TCP) ||
2514 (ntohs (box->service) != s5r->port) )
2515 break; /* BOX record does not apply */
2516 GNUNET_free_non_null (s5r->dane_data);
2517 s5r->dane_data_len = r->data_size - sizeof (struct GNUNET_GNSRECORD_BoxRecord);
2518 s5r->dane_data = GNUNET_malloc (s5r->dane_data_len);
2519 GNUNET_memcpy (s5r->dane_data,
2521 s5r->dane_data_len);
2529 if (GNUNET_YES != got_ip)
2531 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2532 "Name resolution failed to yield useful IP address.\n");
2533 signal_socks_failure (s5r,
2534 SOCKS5_STATUS_GENERAL_FAILURE);
2537 s5r->state = SOCKS5_DATA_TRANSFER;
2538 signal_socks_success (s5r);
2543 * Remove the first @a len bytes from the beginning of the read buffer.
2545 * @param s5r the handle clear the read buffer for
2546 * @param len number of bytes in read buffer to advance
2549 clear_from_s5r_rbuf (struct Socks5Request *s5r,
2552 GNUNET_assert (len <= s5r->rbuf_len);
2555 s5r->rbuf_len - len);
2556 s5r->rbuf_len -= len;
2561 * Read data from incoming Socks5 connection
2563 * @param cls the closure with the `struct Socks5Request`
2566 do_s5r_read (void *cls)
2568 struct Socks5Request *s5r = cls;
2569 const struct Socks5ClientHelloMessage *c_hello;
2570 struct Socks5ServerHelloMessage *s_hello;
2571 const struct Socks5ClientRequestMessage *c_req;
2574 const struct GNUNET_SCHEDULER_TaskContext *tc;
2577 tc = GNUNET_SCHEDULER_get_task_context ();
2578 if ( (NULL != tc->read_ready) &&
2579 (GNUNET_NETWORK_fdset_isset (tc->read_ready, s5r->sock)) )
2581 rlen = GNUNET_NETWORK_socket_recv (s5r->sock,
2582 &s5r->rbuf[s5r->rbuf_len],
2583 sizeof (s5r->rbuf) - s5r->rbuf_len);
2586 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2587 "socks5 client disconnected.\n");
2591 s5r->rbuf_len += rlen;
2593 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2596 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2597 "Processing %zu bytes of socks data in state %d\n",
2603 c_hello = (const struct Socks5ClientHelloMessage*) &s5r->rbuf;
2604 if ( (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage)) ||
2605 (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods) )
2606 return; /* need more data */
2607 if (SOCKS_VERSION_5 != c_hello->version)
2609 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2610 _("Unsupported socks version %d\n"),
2611 (int) c_hello->version);
2615 clear_from_s5r_rbuf (s5r,
2616 sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods);
2617 GNUNET_assert (0 == s5r->wbuf_len);
2618 s_hello = (struct Socks5ServerHelloMessage *) &s5r->wbuf;
2619 s5r->wbuf_len = sizeof (struct Socks5ServerHelloMessage);
2620 s_hello->version = SOCKS_VERSION_5;
2621 s_hello->auth_method = SOCKS_AUTH_NONE;
2622 GNUNET_assert (NULL == s5r->wtask);
2623 s5r->wtask = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2626 s5r->state = SOCKS5_REQUEST;
2628 case SOCKS5_REQUEST:
2629 c_req = (const struct Socks5ClientRequestMessage *) &s5r->rbuf;
2630 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage))
2632 switch (c_req->command)
2634 case SOCKS5_CMD_TCP_STREAM:
2638 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2639 _("Unsupported socks command %d\n"),
2640 (int) c_req->command);
2641 signal_socks_failure (s5r,
2642 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED);
2645 switch (c_req->addr_type)
2647 case SOCKS5_AT_IPV4:
2649 const struct in_addr *v4 = (const struct in_addr *) &c_req[1];
2650 const uint16_t *port = (const uint16_t *) &v4[1];
2651 struct sockaddr_in *in;
2653 s5r->port = ntohs (*port);
2654 if (HTTPS_PORT == s5r->port)
2656 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2657 _("SSL connection to plain IPv4 address requested\n"));
2658 signal_socks_failure (s5r,
2659 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE);
2662 alen = sizeof (struct in_addr);
2663 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2664 alen + sizeof (uint16_t))
2665 return; /* need more data */
2666 in = (struct sockaddr_in *) &s5r->destination_address;
2667 in->sin_family = AF_INET;
2669 in->sin_port = *port;
2670 #if HAVE_SOCKADDR_IN_SIN_LEN
2671 in->sin_len = sizeof (*in);
2673 s5r->state = SOCKS5_DATA_TRANSFER;
2676 case SOCKS5_AT_IPV6:
2678 const struct in6_addr *v6 = (const struct in6_addr *) &c_req[1];
2679 const uint16_t *port = (const uint16_t *) &v6[1];
2680 struct sockaddr_in6 *in;
2682 s5r->port = ntohs (*port);
2683 if (HTTPS_PORT == s5r->port)
2685 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2686 _("SSL connection to plain IPv4 address requested\n"));
2687 signal_socks_failure (s5r,
2688 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE);
2691 alen = sizeof (struct in6_addr);
2692 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2693 alen + sizeof (uint16_t))
2694 return; /* need more data */
2695 in = (struct sockaddr_in6 *) &s5r->destination_address;
2696 in->sin6_family = AF_INET6;
2697 in->sin6_addr = *v6;
2698 in->sin6_port = *port;
2699 #if HAVE_SOCKADDR_IN_SIN_LEN
2700 in->sin6_len = sizeof (*in);
2702 s5r->state = SOCKS5_DATA_TRANSFER;
2705 case SOCKS5_AT_DOMAINNAME:
2707 const uint8_t *dom_len;
2708 const char *dom_name;
2709 const uint16_t *port;
2711 dom_len = (const uint8_t *) &c_req[1];
2712 alen = *dom_len + 1;
2713 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2714 alen + sizeof (uint16_t))
2715 return; /* need more data */
2716 dom_name = (const char *) &dom_len[1];
2717 port = (const uint16_t*) &dom_name[*dom_len];
2718 s5r->domain = GNUNET_strndup (dom_name, *dom_len);
2719 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2720 "Requested connection is to %s:%d\n",
2723 s5r->state = SOCKS5_RESOLVING;
2724 s5r->port = ntohs (*port);
2725 s5r->gns_lookup = GNUNET_GNS_lookup (gns_handle,
2728 GNUNET_DNSPARSER_TYPE_A,
2729 GNUNET_NO /* only cached */,
2730 (GNUNET_YES == do_shorten) ? &local_shorten_zone : NULL,
2736 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2737 _("Unsupported socks address type %d\n"),
2738 (int) c_req->addr_type);
2739 signal_socks_failure (s5r,
2740 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED);
2743 clear_from_s5r_rbuf (s5r,
2744 sizeof (struct Socks5ClientRequestMessage) +
2745 alen + sizeof (uint16_t));
2746 if (0 != s5r->rbuf_len)
2748 /* read more bytes than healthy, why did the client send more!? */
2749 GNUNET_break_op (0);
2750 signal_socks_failure (s5r,
2751 SOCKS5_STATUS_GENERAL_FAILURE);
2754 if (SOCKS5_DATA_TRANSFER == s5r->state)
2756 /* if we are not waiting for GNS resolution, signal success */
2757 signal_socks_success (s5r);
2759 /* We are done reading right now */
2760 GNUNET_SCHEDULER_cancel (s5r->rtask);
2763 case SOCKS5_RESOLVING:
2766 case SOCKS5_DATA_TRANSFER:
2777 * Accept new incoming connections
2779 * @param cls the closure with the lsock4 or lsock6
2780 * @param tc the scheduler context
2783 do_accept (void *cls)
2785 struct GNUNET_NETWORK_Handle *lsock = cls;
2786 struct GNUNET_NETWORK_Handle *s;
2787 struct Socks5Request *s5r;
2789 if (lsock == lsock4)
2793 if (lsock == lsock4)
2794 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2798 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2801 s = GNUNET_NETWORK_socket_accept (lsock, NULL, NULL);
2804 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "accept");
2807 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2808 "Got an inbound connection, waiting for data\n");
2809 s5r = GNUNET_new (struct Socks5Request);
2810 GNUNET_CONTAINER_DLL_insert (s5r_head,
2814 s5r->state = SOCKS5_INIT;
2815 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2821 /* ******************* General / main code ********************* */
2825 * Task run on shutdown
2827 * @param cls closure
2830 do_shutdown (void *cls)
2832 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2833 "Shutting down...\n");
2834 while (NULL != mhd_httpd_head)
2835 kill_httpd (mhd_httpd_head);
2836 while (NULL != s5r_head)
2837 cleanup_s5r (s5r_head);
2840 GNUNET_NETWORK_socket_close (lsock4);
2845 GNUNET_NETWORK_socket_close (lsock6);
2850 GNUNET_IDENTITY_cancel (id_op);
2853 if (NULL != identity)
2855 GNUNET_IDENTITY_disconnect (identity);
2858 if (NULL != curl_multi)
2860 curl_multi_cleanup (curl_multi);
2863 if (NULL != gns_handle)
2865 GNUNET_GNS_disconnect (gns_handle);
2868 if (NULL != curl_download_task)
2870 GNUNET_SCHEDULER_cancel (curl_download_task);
2871 curl_download_task = NULL;
2875 GNUNET_SCHEDULER_cancel (ltask4);
2880 GNUNET_SCHEDULER_cancel (ltask6);
2883 gnutls_x509_crt_deinit (proxy_ca.cert);
2884 gnutls_x509_privkey_deinit (proxy_ca.key);
2885 gnutls_global_deinit ();
2890 * Create an IPv4 listen socket bound to our port.
2892 * @return NULL on error
2894 static struct GNUNET_NETWORK_Handle *
2897 struct GNUNET_NETWORK_Handle *ls;
2898 struct sockaddr_in sa4;
2901 memset (&sa4, 0, sizeof (sa4));
2902 sa4.sin_family = AF_INET;
2903 sa4.sin_port = htons (port);
2904 #if HAVE_SOCKADDR_IN_SIN_LEN
2905 sa4.sin_len = sizeof (sa4);
2907 ls = GNUNET_NETWORK_socket_create (AF_INET,
2913 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa4,
2917 GNUNET_NETWORK_socket_close (ls);
2926 * Create an IPv6 listen socket bound to our port.
2928 * @return NULL on error
2930 static struct GNUNET_NETWORK_Handle *
2933 struct GNUNET_NETWORK_Handle *ls;
2934 struct sockaddr_in6 sa6;
2937 memset (&sa6, 0, sizeof (sa6));
2938 sa6.sin6_family = AF_INET6;
2939 sa6.sin6_port = htons (port);
2940 #if HAVE_SOCKADDR_IN_SIN_LEN
2941 sa6.sin6_len = sizeof (sa6);
2943 ls = GNUNET_NETWORK_socket_create (AF_INET6,
2949 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa6,
2953 GNUNET_NETWORK_socket_close (ls);
2962 * Continue initialization after we have our zone information.
2967 struct MhdHttpList *hd;
2969 /* Open listen socket for socks proxy */
2970 lsock6 = bind_v6 ();
2972 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
2975 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock6, 5))
2977 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
2978 GNUNET_NETWORK_socket_close (lsock6);
2983 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2984 lsock6, &do_accept, lsock6);
2987 lsock4 = bind_v4 ();
2989 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
2992 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock4, 5))
2994 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
2995 GNUNET_NETWORK_socket_close (lsock4);
3000 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3001 lsock4, &do_accept, lsock4);
3004 if ( (NULL == lsock4) &&
3007 GNUNET_SCHEDULER_shutdown ();
3010 if (0 != curl_global_init (CURL_GLOBAL_WIN32))
3012 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3013 "cURL global init failed!\n");
3014 GNUNET_SCHEDULER_shutdown ();
3017 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3018 "Proxy listens on port %lu\n",
3021 /* start MHD daemon for HTTP */
3022 hd = GNUNET_new (struct MhdHttpList);
3023 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_NO_LISTEN_SOCKET,
3026 &create_response, hd,
3027 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
3028 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
3029 MHD_OPTION_NOTIFY_CONNECTION, &mhd_connection_cb, NULL,
3030 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
3032 if (NULL == hd->daemon)
3035 GNUNET_SCHEDULER_shutdown ();
3039 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head, mhd_httpd_tail, hd);
3044 * Method called to inform about the egos of the shorten zone of this peer.
3046 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
3047 * this function is only called ONCE, and 'NULL' being passed in
3048 * @a ego does indicate an error (i.e. name is taken or no default
3049 * value is known). If @a ego is non-NULL and if '*ctx'
3050 * is set in those callbacks, the value WILL be passed to a subsequent
3051 * call to the identity callback of #GNUNET_IDENTITY_connect (if
3052 * that one was not NULL).
3054 * @param cls closure, NULL
3055 * @param ego ego handle
3056 * @param ctx context for application to store data for this ego
3057 * (during the lifetime of this process, initially NULL)
3058 * @param name name assigned by the user for this ego,
3059 * NULL if the user just deleted the ego and it
3060 * must thus no longer be used
3063 identity_shorten_cb (void *cls,
3064 struct GNUNET_IDENTITY_Ego *ego,
3071 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3072 _("No ego configured for `shorten-zone`\n"));
3076 local_shorten_zone = *GNUNET_IDENTITY_ego_get_private_key (ego);
3077 do_shorten = GNUNET_YES;
3084 * Method called to inform about the egos of the master zone of this peer.
3086 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
3087 * this function is only called ONCE, and 'NULL' being passed in
3088 * @a ego does indicate an error (i.e. name is taken or no default
3089 * value is known). If @a ego is non-NULL and if '*ctx'
3090 * is set in those callbacks, the value WILL be passed to a subsequent
3091 * call to the identity callback of #GNUNET_IDENTITY_connect (if
3092 * that one was not NULL).
3094 * @param cls closure, NULL
3095 * @param ego ego handle
3096 * @param ctx context for application to store data for this ego
3097 * (during the lifetime of this process, initially NULL)
3098 * @param name name assigned by the user for this ego,
3099 * NULL if the user just deleted the ego and it
3100 * must thus no longer be used
3103 identity_master_cb (void *cls,
3104 struct GNUNET_IDENTITY_Ego *ego,
3111 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3112 _("No ego configured for `%s`\n"),
3114 GNUNET_SCHEDULER_shutdown ();
3117 GNUNET_IDENTITY_ego_get_public_key (ego,
3119 id_op = GNUNET_IDENTITY_get (identity,
3121 &identity_shorten_cb,
3127 * Main function that will be run
3129 * @param cls closure
3130 * @param args remaining command-line arguments
3131 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
3132 * @param c configuration
3135 run (void *cls, char *const *args, const char *cfgfile,
3136 const struct GNUNET_CONFIGURATION_Handle *c)
3138 char* cafile_cfg = NULL;
3143 if (NULL == (curl_multi = curl_multi_init ()))
3145 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3146 "Failed to create cURL multi handle!\n");
3149 cafile = cafile_opt;
3152 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "gns-proxy",
3156 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
3161 cafile = cafile_cfg;
3163 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3164 "Using %s as CA\n", cafile);
3166 gnutls_global_init ();
3167 gnutls_x509_crt_init (&proxy_ca.cert);
3168 gnutls_x509_privkey_init (&proxy_ca.key);
3170 if ( (GNUNET_OK != load_cert_from_file (proxy_ca.cert, cafile)) ||
3171 (GNUNET_OK != load_key_from_file (proxy_ca.key, cafile)) )
3173 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3174 _("Failed to load SSL/TLS key and certificate from `%s'\n"),
3176 gnutls_x509_crt_deinit (proxy_ca.cert);
3177 gnutls_x509_privkey_deinit (proxy_ca.key);
3178 gnutls_global_deinit ();
3179 GNUNET_free_non_null (cafile_cfg);
3182 GNUNET_free_non_null (cafile_cfg);
3183 if (NULL == (gns_handle = GNUNET_GNS_connect (cfg)))
3185 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3186 "Unable to connect to GNS!\n");
3187 gnutls_x509_crt_deinit (proxy_ca.cert);
3188 gnutls_x509_privkey_deinit (proxy_ca.key);
3189 gnutls_global_deinit ();
3192 identity = GNUNET_IDENTITY_connect (cfg,
3194 id_op = GNUNET_IDENTITY_get (identity,
3196 &identity_master_cb,
3198 GNUNET_SCHEDULER_add_shutdown (&do_shutdown, NULL);
3203 * The main function for gnunet-gns-proxy.
3205 * @param argc number of arguments from the command line
3206 * @param argv command line arguments
3207 * @return 0 ok, 1 on error
3210 main (int argc, char *const *argv)
3212 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
3214 gettext_noop ("listen on specified port (default: 7777)"), 1,
3215 &GNUNET_GETOPT_set_ulong, &port},
3216 {'a', "authority", NULL,
3217 gettext_noop ("pem file to use as CA"), 1,
3218 &GNUNET_GETOPT_set_string, &cafile_opt},
3219 GNUNET_GETOPT_OPTION_END
3221 static const char* page =
3222 "<html><head><title>gnunet-gns-proxy</title>"
3223 "</head><body>cURL fail</body></html>";
3226 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
3228 GNUNET_log_setup ("gnunet-gns-proxy", "WARNING", NULL);
3229 curl_failure_response = MHD_create_response_from_buffer (strlen (page),
3231 MHD_RESPMEM_PERSISTENT);
3235 GNUNET_PROGRAM_run (argc, argv, "gnunet-gns-proxy",
3236 _("GNUnet GNS proxy"),
3238 &run, NULL)) ? 0 : 1;
3239 MHD_destroy_response (curl_failure_response);
3240 GNUNET_free_non_null ((char *) argv);
3241 GNUNET_CRYPTO_ecdsa_key_clear (&local_shorten_zone);
3245 /* end of gnunet-gns-proxy.c */