2 This file is part of GNUnet.
3 (C) 2012-2014 Christian Grothoff (and other contributing authors)
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., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, 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>
32 #include <curl/curl.h>
33 #include <gnutls/gnutls.h>
34 #include <gnutls/x509.h>
35 #include <gnutls/abstract.h>
36 #include <gnutls/crypto.h>
38 #include <gnutls/dane.h>
41 #include "gnunet_util_lib.h"
42 #include "gnunet_gns_service.h"
43 #include "gnunet_identity_service.h"
48 * Default Socks5 listen port.
50 #define GNUNET_GNS_PROXY_PORT 7777
53 * Maximum supported length for a URI.
54 * Should die. @deprecated
56 #define MAX_HTTP_URI_LENGTH 2048
59 * Size of the buffer for the data upload / download. Must be
60 * enough for curl, thus CURL_MAX_WRITE_SIZE is needed here (16k).
62 #define IO_BUFFERSIZE CURL_MAX_WRITE_SIZE
65 * Size of the read/write buffers for Socks. Uses
66 * 256 bytes for the hostname (at most), plus a few
67 * bytes overhead for the messages.
69 #define SOCKS_BUFFERSIZE (256 + 32)
72 * Port for plaintext HTTP.
79 #define HTTPS_PORT 443
82 * Largest allowed size for a PEM certificate.
84 #define MAX_PEM_SIZE (10 * 1024)
87 * After how long do we clean up unused MHD SSL/TLS instances?
89 #define MHD_CACHE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
92 * After how long do we clean up Socks5 handles that failed to show any activity
93 * with their respective MHD instance?
95 #define HTTP_HANDSHAKE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
101 * @param level log level
102 * @param fun name of curl_easy-function that gave the error
103 * @param rc return code from curl
105 #define LOG_CURL_EASY(level,fun,rc) GNUNET_log(level, _("%s failed at %s:%d: `%s'\n"), fun, __FILE__, __LINE__, curl_easy_strerror (rc))
108 /* *************** Socks protocol definitions (move to TUN?) ****************** */
111 * Which SOCKS version do we speak?
113 #define SOCKS_VERSION_5 0x05
116 * Flag to set for 'no authentication'.
118 #define SOCKS_AUTH_NONE 0
122 * Commands in Socks5.
127 * Establish TCP/IP stream.
129 SOCKS5_CMD_TCP_STREAM = 1,
132 * Establish TCP port binding.
134 SOCKS5_CMD_TCP_PORT = 2,
137 * Establish UDP port binding.
139 SOCKS5_CMD_UDP_PORT = 3
144 * Address types in Socks5.
146 enum Socks5AddressType
156 SOCKS5_AT_DOMAINNAME = 3,
167 * Status codes in Socks5 response.
169 enum Socks5StatusCode
171 SOCKS5_STATUS_REQUEST_GRANTED = 0,
172 SOCKS5_STATUS_GENERAL_FAILURE = 1,
173 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE = 2,
174 SOCKS5_STATUS_NETWORK_UNREACHABLE = 3,
175 SOCKS5_STATUS_HOST_UNREACHABLE = 4,
176 SOCKS5_STATUS_CONNECTION_REFUSED_BY_HOST = 5,
177 SOCKS5_STATUS_TTL_EXPIRED = 6,
178 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED = 7,
179 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED = 8
184 * Client hello in Socks5 protocol.
186 struct Socks5ClientHelloMessage
189 * Should be #SOCKS_VERSION_5.
194 * How many authentication methods does the client support.
196 uint8_t num_auth_methods;
198 /* followed by supported authentication methods, 1 byte per method */
204 * Server hello in Socks5 protocol.
206 struct Socks5ServerHelloMessage
209 * Should be #SOCKS_VERSION_5.
214 * Chosen authentication method, for us always #SOCKS_AUTH_NONE,
215 * which skips the authentication step.
222 * Client socks request in Socks5 protocol.
224 struct Socks5ClientRequestMessage
227 * Should be #SOCKS_VERSION_5.
232 * Command code, we only uspport #SOCKS5_CMD_TCP_STREAM.
237 * Reserved, always zero.
242 * Address type, an `enum Socks5AddressType`.
247 * Followed by either an ip4/ipv6 address or a domain name with a
248 * length field (uint8_t) in front (depending on @e addr_type).
249 * followed by port number in network byte order (uint16_t).
255 * Server response to client requests in Socks5 protocol.
257 struct Socks5ServerResponseMessage
260 * Should be #SOCKS_VERSION_5.
265 * Status code, an `enum Socks5StatusCode`
275 * Address type, an `enum Socks5AddressType`.
280 * Followed by either an ip4/ipv6 address or a domain name with a
281 * length field (uint8_t) in front (depending on @e addr_type).
282 * followed by port number in network byte order (uint16_t).
289 /* *********************** Datastructures for HTTP handling ****************** */
292 * A structure for CA cert/key
299 gnutls_x509_crt_t cert;
304 gnutls_x509_privkey_t key;
309 * Structure for GNS certificates
311 struct ProxyGNSCertificate
314 * The certificate as PEM
316 char cert[MAX_PEM_SIZE];
319 * The private key as PEM
321 char key[MAX_PEM_SIZE];
327 * A structure for all running Httpds
334 struct MhdHttpList *prev;
339 struct MhdHttpList *next;
342 * the domain name to server (only important for SSL)
349 struct MHD_Daemon *daemon;
352 * Optional proxy certificate used
354 struct ProxyGNSCertificate *proxy_cert;
359 GNUNET_SCHEDULER_TaskIdentifier httpd_task;
362 * is this an ssl daemon?
369 /* ***************** Datastructures for Socks handling **************** */
378 * We're waiting to get the client hello.
383 * We're waiting to get the initial request.
388 * We are currently resolving the destination.
393 * We're in transfer mode.
395 SOCKS5_DATA_TRANSFER,
398 * Finish writing the write buffer, then clean up.
400 SOCKS5_WRITE_THEN_CLEANUP,
403 * Socket has been passed to MHD, do not close it anymore.
405 SOCKS5_SOCKET_WITH_MHD,
408 * We've finished receiving upload data from MHD.
410 SOCKS5_SOCKET_UPLOAD_STARTED,
413 * We've finished receiving upload data from MHD.
415 SOCKS5_SOCKET_UPLOAD_DONE,
418 * We've finished uploading data via CURL and can now download.
420 SOCKS5_SOCKET_DOWNLOAD_STARTED,
423 * We've finished receiving download data from cURL.
425 SOCKS5_SOCKET_DOWNLOAD_DONE
431 * A structure for socks requests
439 struct Socks5Request *next;
444 struct Socks5Request *prev;
449 struct GNUNET_NETWORK_Handle *sock;
452 * Handle to GNS lookup, during #SOCKS5_RESOLVING phase.
454 struct GNUNET_GNS_LookupRequest *gns_lookup;
457 * Client socket read task
459 GNUNET_SCHEDULER_TaskIdentifier rtask;
462 * Client socket write task
464 GNUNET_SCHEDULER_TaskIdentifier wtask;
469 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
474 char rbuf[SOCKS_BUFFERSIZE];
479 char wbuf[SOCKS_BUFFERSIZE];
482 * Buffer we use for moving data between MHD and curl (in both directions).
484 char io_buf[IO_BUFFERSIZE];
487 * MHD HTTP instance handling this request, NULL for none.
489 struct MhdHttpList *hd;
492 * MHD response object for this request.
494 struct MHD_Response *response;
497 * the domain name to server (only important for SSL)
502 * DNS Legacy Host Name as given by GNS, NULL if not given.
507 * Payload of the (last) DANE record encountered.
522 * HTTP request headers for the curl request.
524 struct curl_slist *headers;
527 * HTTP response code to give to MHD for the response.
529 unsigned int response_code;
532 * Number of bytes in @e dane_data.
534 size_t dane_data_len;
537 * Number of bytes already in read buffer
542 * Number of bytes already in write buffer
547 * Number of bytes already in the IO buffer.
552 * Once known, what's the target address for the connection?
554 struct sockaddr_storage destination_address;
559 enum SocksPhase state;
562 * Desired destination port.
570 /* *********************** Globals **************************** */
574 * The port the proxy is running on (default 7777)
576 static unsigned long port = GNUNET_GNS_PROXY_PORT;
579 * The CA file (pem) to use for the proxy CA
581 static char *cafile_opt;
584 * The listen socket of the proxy for IPv4
586 static struct GNUNET_NETWORK_Handle *lsock4;
589 * The listen socket of the proxy for IPv6
591 static struct GNUNET_NETWORK_Handle *lsock6;
594 * The listen task ID for IPv4
596 static GNUNET_SCHEDULER_TaskIdentifier ltask4;
599 * The listen task ID for IPv6
601 static GNUNET_SCHEDULER_TaskIdentifier ltask6;
604 * The cURL download task (curl multi API).
606 static GNUNET_SCHEDULER_TaskIdentifier curl_download_task;
609 * The cURL multi handle
611 static CURLM *curl_multi;
614 * Handle to the GNS service
616 static struct GNUNET_GNS_Handle *gns_handle;
619 * DLL for http/https daemons
621 static struct MhdHttpList *mhd_httpd_head;
624 * DLL for http/https daemons
626 static struct MhdHttpList *mhd_httpd_tail;
629 * Daemon for HTTP (we have one per SSL certificate, and then one for
630 * all HTTP connections; this is the one for HTTP, not HTTPS).
632 static struct MhdHttpList *httpd;
635 * DLL of active socks requests.
637 static struct Socks5Request *s5r_head;
640 * DLL of active socks requests.
642 static struct Socks5Request *s5r_tail;
645 * The users local GNS master zone
647 static struct GNUNET_CRYPTO_EcdsaPublicKey local_gns_zone;
650 * The users local shorten zone
652 static struct GNUNET_CRYPTO_EcdsaPrivateKey local_shorten_zone;
655 * Is shortening enabled?
657 static int do_shorten;
660 * The CA for SSL certificate generation
662 static struct ProxyCA proxy_ca;
665 * Response we return on cURL failures.
667 static struct MHD_Response *curl_failure_response;
670 * Connection to identity service.
672 static struct GNUNET_IDENTITY_Handle *identity;
675 * Request for our ego.
677 static struct GNUNET_IDENTITY_Operation *id_op;
682 static const struct GNUNET_CONFIGURATION_Handle *cfg;
685 /* ************************* Global helpers ********************* */
689 * Run MHD now, we have extra data ready for the callback.
691 * @param hd the daemon to run now.
694 run_mhd_now (struct MhdHttpList *hd);
698 * Clean up s5r handles.
700 * @param s5r the handle to destroy
703 cleanup_s5r (struct Socks5Request *s5r)
705 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
706 "Cleaning up socks request\n");
707 if (NULL != s5r->curl)
709 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
710 "Cleaning up cURL handle\n");
711 curl_multi_remove_handle (curl_multi, s5r->curl);
712 curl_easy_cleanup (s5r->curl);
715 curl_slist_free_all (s5r->headers);
716 if ( (NULL != s5r->response) &&
717 (curl_failure_response != s5r->response) )
718 MHD_destroy_response (s5r->response);
719 if (GNUNET_SCHEDULER_NO_TASK != s5r->rtask)
720 GNUNET_SCHEDULER_cancel (s5r->rtask);
721 if (GNUNET_SCHEDULER_NO_TASK != s5r->timeout_task)
722 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
723 if (GNUNET_SCHEDULER_NO_TASK != s5r->wtask)
724 GNUNET_SCHEDULER_cancel (s5r->wtask);
725 if (NULL != s5r->gns_lookup)
726 GNUNET_GNS_lookup_cancel (s5r->gns_lookup);
727 if (NULL != s5r->sock)
729 if (SOCKS5_SOCKET_WITH_MHD <= s5r->state)
730 GNUNET_NETWORK_socket_free_memory_only_ (s5r->sock);
732 GNUNET_NETWORK_socket_close (s5r->sock);
734 GNUNET_CONTAINER_DLL_remove (s5r_head,
737 GNUNET_free_non_null (s5r->domain);
738 GNUNET_free_non_null (s5r->leho);
739 GNUNET_free_non_null (s5r->url);
740 GNUNET_free_non_null (s5r->dane_data);
745 /* ************************* HTTP handling with cURL *********************** */
749 * Callback for MHD response generation. This function is called from
750 * MHD whenever MHD expects to get data back. Copies data from the
751 * io_buf, if available.
753 * @param cls closure with our `struct Socks5Request`
754 * @param pos in buffer
755 * @param buf where to copy data
756 * @param max available space in @a buf
757 * @return number of bytes written to @a buf
760 mhd_content_cb (void *cls,
765 struct Socks5Request *s5r = cls;
766 size_t bytes_to_copy;
768 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
769 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
771 /* we're still not done with the upload, do not yet
772 start the download, the IO buffer is still full
774 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
775 "Pausing MHD download, not yet ready for download\n");
776 return 0; /* not yet ready for data download */
778 bytes_to_copy = GNUNET_MIN (max,
780 if ( (0 == bytes_to_copy) &&
781 (SOCKS5_SOCKET_DOWNLOAD_DONE != s5r->state) )
783 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
784 "Pausing MHD download, no data available\n");
785 return 0; /* more data later */
787 if ( (0 == bytes_to_copy) &&
788 (SOCKS5_SOCKET_DOWNLOAD_DONE == s5r->state) )
790 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
791 "Completed MHD download\n");
792 return MHD_CONTENT_READER_END_OF_STREAM;
794 memcpy (buf, s5r->io_buf, bytes_to_copy);
795 memmove (s5r->io_buf,
796 &s5r->io_buf[bytes_to_copy],
797 s5r->io_len - bytes_to_copy);
798 s5r->io_len -= bytes_to_copy;
799 if (NULL != s5r->curl)
800 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
801 return bytes_to_copy;
806 * Check that the website has presented us with a valid SSL certificate.
807 * The certificate must either match the domain name or the LEHO name
808 * (or, if available, the TLSA record).
810 * @param s5r request to check for.
811 * @return #GNUNET_OK if the certificate is valid
814 check_ssl_certificate (struct Socks5Request *s5r)
816 unsigned int cert_list_size;
817 const gnutls_datum_t *chainp;
818 const struct curl_tlssessioninfo *tlsinfo;
819 char certdn[GNUNET_DNSPARSER_MAX_NAME_LENGTH + 3];
821 gnutls_x509_crt_t x509_cert;
826 curl_easy_getinfo (s5r->curl,
827 CURLINFO_TLS_SESSION,
828 (struct curl_slist **) &tlsinfo))
829 return GNUNET_SYSERR;
830 if (CURLSSLBACKEND_GNUTLS != tlsinfo->backend)
832 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
833 _("Unsupported CURL SSL backend %d\n"),
835 return GNUNET_SYSERR;
837 chainp = gnutls_certificate_get_peers (tlsinfo->internals, &cert_list_size);
838 if ( (! chainp) || (0 == cert_list_size) )
839 return GNUNET_SYSERR;
841 size = sizeof (certdn);
842 /* initialize an X.509 certificate structure. */
843 gnutls_x509_crt_init (&x509_cert);
844 gnutls_x509_crt_import (x509_cert,
846 GNUTLS_X509_FMT_DER);
848 if (0 != (rc = gnutls_x509_crt_get_dn_by_oid (x509_cert,
849 GNUTLS_OID_X520_COMMON_NAME,
850 0, /* the first and only one */
851 0 /* no DER encoding */,
855 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
856 _("Failed to fetch CN from cert: %s\n"),
857 gnutls_strerror(rc));
858 gnutls_x509_crt_deinit (x509_cert);
859 return GNUNET_SYSERR;
861 /* check for TLSA/DANE records */
863 if (NULL != s5r->dane_data)
865 char *dd[] = { s5r->dane_data, NULL };
866 int dlen[] = { s5r->dane_data_len, 0};
867 dane_state_t dane_state;
868 dane_query_t dane_query;
871 /* FIXME: add flags to gnutls to NOT read UNBOUND_ROOT_KEY_FILE here! */
872 if (0 != (rc = dane_state_init (&dane_state,
873 #ifdef DANE_F_IGNORE_DNSSEC
874 DANE_F_IGNORE_DNSSEC |
876 DANE_F_IGNORE_LOCAL_RESOLVER)))
878 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
879 _("Failed to initialize DANE: %s\n"),
881 gnutls_x509_crt_deinit (x509_cert);
882 return GNUNET_SYSERR;
884 if (0 != (rc = dane_raw_tlsa (dane_state,
891 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
892 _("Failed to parse DANE record: %s\n"),
894 dane_state_deinit (dane_state);
895 gnutls_x509_crt_deinit (x509_cert);
896 return GNUNET_SYSERR;
898 if (0 != (rc = dane_verify_crt_raw (dane_state,
901 gnutls_certificate_type_get (tlsinfo->internals),
906 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
907 _("Failed to verify TLS connection using DANE: %s\n"),
909 dane_query_deinit (dane_query);
910 dane_state_deinit (dane_state);
911 gnutls_x509_crt_deinit (x509_cert);
912 return GNUNET_SYSERR;
916 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
917 _("Failed DANE verification failed with GnuTLS verify status code: %u\n"),
919 dane_query_deinit (dane_query);
920 dane_state_deinit (dane_state);
921 gnutls_x509_crt_deinit (x509_cert);
922 return GNUNET_SYSERR;
924 dane_query_deinit (dane_query);
925 dane_state_deinit (dane_state);
931 /* try LEHO or ordinary domain name X509 verification */
933 if (NULL != s5r->leho)
937 if (0 == (rc = gnutls_x509_crt_check_hostname (x509_cert,
940 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
941 _("SSL certificate subject name (%s) does not match `%s'\n"),
944 gnutls_x509_crt_deinit (x509_cert);
945 return GNUNET_SYSERR;
950 /* we did not even have the domain name!? */
952 return GNUNET_SYSERR;
955 gnutls_x509_crt_deinit (x509_cert);
961 * We're getting an HTTP response header from cURL. Convert it to the
962 * MHD response headers. Mostly copies the headers, but makes special
963 * adjustments to "Set-Cookie" and "Location" headers as those may need
964 * to be changed from the LEHO to the domain the browser expects.
966 * @param buffer curl buffer with a single line of header data; not 0-terminated!
967 * @param size curl blocksize
968 * @param nmemb curl blocknumber
969 * @param cls our `struct Socks5Request *`
970 * @return size of processed bytes
973 curl_check_hdr (void *buffer, size_t size, size_t nmemb, void *cls)
975 struct Socks5Request *s5r = cls;
976 size_t bytes = size * nmemb;
978 const char *hdr_type;
979 const char *cookie_domain;
982 char *new_cookie_hdr;
985 size_t delta_cdomain;
989 if (NULL == s5r->response)
991 /* first, check SSL certificate */
992 if ( (HTTPS_PORT == s5r->port) &&
993 (GNUNET_OK != check_ssl_certificate (s5r)) )
996 GNUNET_break (CURLE_OK ==
997 curl_easy_getinfo (s5r->curl,
998 CURLINFO_RESPONSE_CODE,
1000 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1001 "Creating MHD response with code %d\n",
1003 s5r->response_code = resp_code;
1004 s5r->response = MHD_create_response_from_callback (MHD_SIZE_UNKNOWN,
1009 if (NULL != s5r->leho)
1013 GNUNET_asprintf (&cors_hdr,
1014 (HTTPS_PORT == s5r->port)
1019 GNUNET_break (MHD_YES ==
1020 MHD_add_response_header (s5r->response,
1021 MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN,
1023 GNUNET_free (cors_hdr);
1025 /* force connection to be closed after each request, as we
1026 do not support HTTP pipelining */
1027 GNUNET_break (MHD_YES ==
1028 MHD_add_response_header (s5r->response,
1029 MHD_HTTP_HEADER_CONNECTION,
1033 ndup = GNUNET_strndup (buffer, bytes);
1034 hdr_type = strtok (ndup, ":");
1035 if (NULL == hdr_type)
1040 hdr_val = strtok (NULL, "");
1041 if (NULL == hdr_val)
1046 if (' ' == *hdr_val)
1049 /* custom logic for certain header types */
1050 new_cookie_hdr = NULL;
1051 if ( (NULL != s5r->leho) &&
1052 (0 == strcasecmp (hdr_type,
1053 MHD_HTTP_HEADER_SET_COOKIE)) )
1056 new_cookie_hdr = GNUNET_malloc (strlen (hdr_val) +
1057 strlen (s5r->domain) + 1);
1059 domain_matched = GNUNET_NO; /* make sure we match domain at most once */
1060 for (tok = strtok (hdr_val, ";"); NULL != tok; tok = strtok (NULL, ";"))
1062 if ( (0 == strncasecmp (tok, " domain", strlen (" domain"))) &&
1063 (GNUNET_NO == domain_matched) )
1065 domain_matched = GNUNET_YES;
1066 cookie_domain = tok + strlen (" domain") + 1;
1067 if (strlen (cookie_domain) < strlen (s5r->leho))
1069 delta_cdomain = strlen (s5r->leho) - strlen (cookie_domain);
1070 if (0 == strcasecmp (cookie_domain, s5r->leho + delta_cdomain))
1072 offset += sprintf (new_cookie_hdr + offset,
1078 else if (0 == strcmp (cookie_domain, s5r->leho))
1080 offset += sprintf (new_cookie_hdr + offset,
1085 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1086 _("Cookie domain `%s' supplied by server is invalid\n"),
1089 memcpy (new_cookie_hdr + offset, tok, strlen (tok));
1090 offset += strlen (tok);
1091 new_cookie_hdr[offset++] = ';';
1093 hdr_val = new_cookie_hdr;
1096 new_location = NULL;
1097 if (0 == strcasecmp (MHD_HTTP_HEADER_LOCATION, hdr_type))
1101 GNUNET_asprintf (&leho_host,
1102 (HTTPS_PORT != s5r->port)
1106 if (0 == strncmp (leho_host,
1108 strlen (leho_host)))
1110 GNUNET_asprintf (&new_location,
1112 (HTTPS_PORT != s5r->port)
1116 hdr_val + strlen (leho_host));
1117 hdr_val = new_location;
1119 GNUNET_free (leho_host);
1121 /* MHD does not allow certain characters in values, remove those */
1122 if (NULL != (tok = strchr (hdr_val, '\n')))
1124 if (NULL != (tok = strchr (hdr_val, '\r')))
1126 if (NULL != (tok = strchr (hdr_val, '\t')))
1128 if (0 != strlen (hdr_val))
1130 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1131 "Adding header %s: %s to MHD response\n",
1134 GNUNET_break (MHD_YES ==
1135 MHD_add_response_header (s5r->response,
1140 GNUNET_free_non_null (new_cookie_hdr);
1141 GNUNET_free_non_null (new_location);
1147 * Handle response payload data from cURL. Copies it into our `io_buf` to make
1148 * it available to MHD.
1150 * @param ptr pointer to the data
1151 * @param size number of blocks of data
1152 * @param nmemb blocksize
1153 * @param ctx our `struct Socks5Request *`
1154 * @return number of bytes handled
1157 curl_download_cb (void *ptr, size_t size, size_t nmemb, void* ctx)
1159 struct Socks5Request *s5r = ctx;
1160 size_t total = size * nmemb;
1162 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
1163 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1165 /* we're still not done with the upload, do not yet
1166 start the download, the IO buffer is still full
1167 with upload data. */
1168 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1169 "Pausing CURL download, waiting for UPLOAD to finish\n");
1170 return CURL_WRITEFUNC_PAUSE; /* not yet ready for data download */
1172 if (sizeof (s5r->io_buf) - s5r->io_len < total)
1174 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1175 "Pausing CURL download, not enough space\n");
1176 return CURL_WRITEFUNC_PAUSE; /* not enough space */
1178 memcpy (&s5r->io_buf[s5r->io_len],
1181 s5r->io_len += total;
1182 if (s5r->io_len == total)
1183 run_mhd_now (s5r->hd);
1189 * cURL callback for uploaded (PUT/POST) data. Copies it into our `io_buf`
1190 * to make it available to MHD.
1192 * @param buf where to write the data
1193 * @param size number of bytes per member
1194 * @param nmemb number of members available in @a buf
1195 * @param cls our `struct Socks5Request` that generated the data
1196 * @return number of bytes copied to @a buf
1199 curl_upload_cb (void *buf, size_t size, size_t nmemb, void *cls)
1201 struct Socks5Request *s5r = cls;
1202 size_t len = size * nmemb;
1205 if ( (0 == s5r->io_len) &&
1206 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1208 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1209 "Pausing CURL UPLOAD, need more data\n");
1210 return CURL_READFUNC_PAUSE;
1212 if ( (0 == s5r->io_len) &&
1213 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1215 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1216 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1217 "Completed CURL UPLOAD\n");
1218 return 0; /* upload finished, can now download */
1220 if ( (SOCKS5_SOCKET_UPLOAD_STARTED != s5r->state) ||
1221 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1224 return CURL_READFUNC_ABORT;
1226 to_copy = GNUNET_MIN (s5r->io_len,
1228 memcpy (buf, s5r->io_buf, to_copy);
1229 memmove (s5r->io_buf,
1230 &s5r->io_buf[to_copy],
1231 s5r->io_len - to_copy);
1232 s5r->io_len -= to_copy;
1233 if (s5r->io_len + to_copy == sizeof (s5r->io_buf))
1234 run_mhd_now (s5r->hd); /* got more space for upload now */
1239 /* ************************** main loop of cURL interaction ****************** */
1243 * Task that is run when we are ready to receive more data
1246 * @param cls closure
1247 * @param tc task context
1250 curl_task_download (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
1254 * Ask cURL for the select() sets and schedule cURL operations.
1257 curl_download_prepare ()
1264 struct GNUNET_NETWORK_FDSet *grs;
1265 struct GNUNET_NETWORK_FDSet *gws;
1267 struct GNUNET_TIME_Relative rtime;
1269 if (GNUNET_SCHEDULER_NO_TASK != curl_download_task)
1271 GNUNET_SCHEDULER_cancel (curl_download_task);
1272 curl_download_task = GNUNET_SCHEDULER_NO_TASK;
1278 if (CURLM_OK != (mret = curl_multi_fdset (curl_multi, &rs, &ws, &es, &max)))
1280 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1281 "%s failed at %s:%d: `%s'\n",
1282 "curl_multi_fdset", __FILE__, __LINE__,
1283 curl_multi_strerror (mret));
1287 GNUNET_break (CURLM_OK == curl_multi_timeout (curl_multi, &to));
1289 rtime = GNUNET_TIME_UNIT_FOREVER_REL;
1291 rtime = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, to);
1294 grs = GNUNET_NETWORK_fdset_create ();
1295 gws = GNUNET_NETWORK_fdset_create ();
1296 GNUNET_NETWORK_fdset_copy_native (grs, &rs, max + 1);
1297 GNUNET_NETWORK_fdset_copy_native (gws, &ws, max + 1);
1298 curl_download_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1301 &curl_task_download, curl_multi);
1302 GNUNET_NETWORK_fdset_destroy (gws);
1303 GNUNET_NETWORK_fdset_destroy (grs);
1307 curl_download_task = GNUNET_SCHEDULER_add_delayed (rtime,
1308 &curl_task_download,
1315 * Task that is run when we are ready to receive more data from curl.
1317 * @param cls closure, NULL
1318 * @param tc task context
1321 curl_task_download (void *cls,
1322 const struct GNUNET_SCHEDULER_TaskContext *tc)
1326 struct CURLMsg *msg;
1328 struct Socks5Request *s5r;
1330 curl_download_task = GNUNET_SCHEDULER_NO_TASK;
1334 mret = curl_multi_perform (curl_multi, &running);
1335 while (NULL != (msg = curl_multi_info_read (curl_multi, &msgnum)))
1337 GNUNET_break (CURLE_OK ==
1338 curl_easy_getinfo (msg->easy_handle,
1349 /* documentation says this is not used */
1353 switch (msg->data.result)
1356 case CURLE_GOT_NOTHING:
1357 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1358 "CURL download completed.\n");
1359 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1360 run_mhd_now (s5r->hd);
1363 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1364 "Download curl failed: %s\n",
1365 curl_easy_strerror (msg->data.result));
1366 /* FIXME: indicate error somehow? close MHD connection badly as well? */
1367 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1368 run_mhd_now (s5r->hd);
1371 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1372 "Cleaning up cURL handle\n");
1373 curl_multi_remove_handle (curl_multi, s5r->curl);
1374 curl_easy_cleanup (s5r->curl);
1376 if (NULL == s5r->response)
1377 s5r->response = curl_failure_response;
1380 /* documentation says this is not used */
1384 /* unexpected status code */
1389 } while (mret == CURLM_CALL_MULTI_PERFORM);
1390 if (CURLM_OK != mret)
1391 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1392 "%s failed at %s:%d: `%s'\n",
1393 "curl_multi_perform", __FILE__, __LINE__,
1394 curl_multi_strerror (mret));
1397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1398 "Suspending cURL multi loop, no more events pending\n");
1399 return; /* nothing more in progress */
1401 curl_download_prepare ();
1405 /* ********************************* MHD response generation ******************* */
1409 * Read HTTP request header field from the request. Copies the fields
1410 * over to the 'headers' that will be given to curl. However, 'Host'
1411 * is substituted with the LEHO if present. We also change the
1412 * 'Connection' header value to "close" as the proxy does not support
1415 * @param cls our `struct Socks5Request`
1416 * @param kind value kind
1417 * @param key field key
1418 * @param value field value
1419 * @return MHD_YES to continue to iterate
1422 con_val_iter (void *cls,
1423 enum MHD_ValueKind kind,
1427 struct Socks5Request *s5r = cls;
1430 if ( (0 == strcasecmp (MHD_HTTP_HEADER_HOST, key)) &&
1431 (NULL != s5r->leho) )
1433 if (0 == strcasecmp (MHD_HTTP_HEADER_CONNECTION, key))
1435 GNUNET_asprintf (&hdr,
1439 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1440 "Adding HEADER `%s' to HTTP request\n",
1442 s5r->headers = curl_slist_append (s5r->headers,
1450 * Main MHD callback for handling requests.
1453 * @param con MHD connection handle
1454 * @param url the url in the request
1455 * @param meth the HTTP method used ("GET", "PUT", etc.)
1456 * @param ver the HTTP version string (i.e. "HTTP/1.1")
1457 * @param upload_data the data being uploaded (excluding HEADERS,
1458 * for a POST that fits into memory and that is encoded
1459 * with a supported encoding, the POST data will NOT be
1460 * given in upload_data and is instead available as
1461 * part of MHD_get_connection_values; very large POST
1462 * data *will* be made available incrementally in
1464 * @param upload_data_size set initially to the size of the
1465 * @a upload_data provided; the method must update this
1466 * value to the number of bytes NOT processed;
1467 * @param con_cls pointer to location where we store the 'struct Request'
1468 * @return MHD_YES if the connection was handled successfully,
1469 * MHD_NO if the socket must be closed due to a serious
1470 * error while handling the request
1473 create_response (void *cls,
1474 struct MHD_Connection *con,
1478 const char *upload_data,
1479 size_t *upload_data_size,
1482 struct Socks5Request *s5r = *con_cls;
1484 char ipstring[INET6_ADDRSTRLEN];
1485 char ipaddr[INET6_ADDRSTRLEN + 2];
1486 const struct sockaddr *sa;
1487 const struct sockaddr_in *s4;
1488 const struct sockaddr_in6 *s6;
1497 if ( (NULL == s5r->curl) &&
1498 (SOCKS5_SOCKET_WITH_MHD == s5r->state) )
1500 /* first time here, initialize curl handle */
1501 sa = (const struct sockaddr *) &s5r->destination_address;
1502 switch (sa->sa_family)
1505 s4 = (const struct sockaddr_in *) &s5r->destination_address;
1506 if (NULL == inet_ntop (AF_INET,
1514 GNUNET_snprintf (ipaddr,
1518 port = ntohs (s4->sin_port);
1521 s6 = (const struct sockaddr_in6 *) &s5r->destination_address;
1522 if (NULL == inet_ntop (AF_INET6,
1530 GNUNET_snprintf (ipaddr,
1534 port = ntohs (s6->sin6_port);
1540 s5r->curl = curl_easy_init ();
1541 if (NULL == s5r->curl)
1542 return MHD_queue_response (con,
1543 MHD_HTTP_INTERNAL_SERVER_ERROR,
1544 curl_failure_response);
1545 curl_easy_setopt (s5r->curl, CURLOPT_HEADERFUNCTION, &curl_check_hdr);
1546 curl_easy_setopt (s5r->curl, CURLOPT_HEADERDATA, s5r);
1547 curl_easy_setopt (s5r->curl, CURLOPT_FOLLOWLOCATION, 0);
1548 curl_easy_setopt (s5r->curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
1549 curl_easy_setopt (s5r->curl, CURLOPT_CONNECTTIMEOUT, 600L);
1550 curl_easy_setopt (s5r->curl, CURLOPT_TIMEOUT, 600L);
1551 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1552 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_CONTENT_DECODING, 0);
1553 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_TRANSFER_DECODING, 0);
1554 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1555 curl_easy_setopt (s5r->curl, CURLOPT_PRIVATE, s5r);
1556 curl_easy_setopt (s5r->curl, CURLOPT_VERBOSE, 0);
1557 GNUNET_asprintf (&curlurl,
1558 (HTTPS_PORT != s5r->port)
1560 : "https://%s:%d%s",
1564 curl_easy_setopt (s5r->curl,
1567 GNUNET_free (curlurl);
1569 if (0 == strcasecmp (meth, MHD_HTTP_METHOD_PUT))
1571 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1572 curl_easy_setopt (s5r->curl, CURLOPT_UPLOAD, 1);
1573 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1574 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1575 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1576 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1578 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_POST))
1580 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1581 curl_easy_setopt (s5r->curl, CURLOPT_POST, 1);
1582 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1583 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1584 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1585 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1587 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_HEAD))
1589 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1590 curl_easy_setopt (s5r->curl, CURLOPT_NOBODY, 1);
1592 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_GET))
1594 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1595 curl_easy_setopt (s5r->curl, CURLOPT_HTTPGET, 1);
1596 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1597 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1601 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1602 _("Unsupported HTTP method `%s'\n"),
1604 curl_easy_cleanup (s5r->curl);
1609 if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_0))
1611 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
1613 else if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_1))
1615 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
1619 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_NONE);
1622 if (HTTPS_PORT == s5r->port)
1624 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);
1625 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYPEER, 1L);
1626 /* Disable cURL checking the hostname, as we will check ourselves
1627 as only we have the domain name or the LEHO or the DANE record */
1628 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYHOST, 0L);
1632 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_NONE);
1635 if (CURLM_OK != curl_multi_add_handle (curl_multi, s5r->curl))
1638 curl_easy_cleanup (s5r->curl);
1642 MHD_get_connection_values (con,
1644 &con_val_iter, s5r);
1645 curl_easy_setopt (s5r->curl, CURLOPT_HTTPHEADER, s5r->headers);
1646 curl_download_prepare ();
1650 /* continuing to process request */
1651 if (0 != *upload_data_size)
1653 left = GNUNET_MIN (*upload_data_size,
1654 sizeof (s5r->io_buf) - s5r->io_len);
1655 memcpy (&s5r->io_buf[s5r->io_len],
1658 s5r->io_len += left;
1659 *upload_data_size -= left;
1660 GNUNET_assert (NULL != s5r->curl);
1661 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
1662 curl_download_prepare ();
1665 if (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state)
1667 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1668 "Finished processing UPLOAD\n");
1669 s5r->state = SOCKS5_SOCKET_UPLOAD_DONE;
1671 if (NULL == s5r->response)
1672 return MHD_YES; /* too early to queue response, did not yet get headers from cURL */
1673 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1674 "Queueing response with MHD\n");
1675 return MHD_queue_response (con,
1681 /* ******************** MHD HTTP setup and event loop ******************** */
1685 * Function called when MHD decides that we are done with a connection.
1688 * @param connection connection handle
1689 * @param con_cls value as set by the last call to
1690 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
1691 * @param toe reason for request termination (ignored)
1694 mhd_completed_cb (void *cls,
1695 struct MHD_Connection *connection,
1697 enum MHD_RequestTerminationCode toe)
1699 struct Socks5Request *s5r = *con_cls;
1703 if (MHD_REQUEST_TERMINATED_COMPLETED_OK != toe)
1704 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1705 "MHD encountered error handling request: %d\n",
1713 * Function called when MHD first processes an incoming connection.
1714 * Gives us the respective URI information.
1716 * We use this to associate the `struct MHD_Connection` with our
1717 * internal `struct Socks5Request` data structure (by checking
1718 * for matching sockets).
1720 * @param cls the HTTP server handle (a `struct MhdHttpList`)
1721 * @param url the URL that is being requested
1722 * @param connection MHD connection object for the request
1723 * @return the `struct Socks5Request` that this @a connection is for
1726 mhd_log_callback (void *cls,
1728 struct MHD_Connection *connection)
1730 struct Socks5Request *s5r;
1731 const union MHD_ConnectionInfo *ci;
1734 ci = MHD_get_connection_info (connection,
1735 MHD_CONNECTION_INFO_CONNECTION_FD);
1741 sock = ci->connect_fd;
1742 for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
1744 if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
1746 if (NULL != s5r->url)
1751 s5r->url = GNUNET_strdup (url);
1752 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
1753 s5r->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1763 * Kill the given MHD daemon.
1765 * @param hd daemon to stop
1768 kill_httpd (struct MhdHttpList *hd)
1770 GNUNET_CONTAINER_DLL_remove (mhd_httpd_head,
1773 GNUNET_free_non_null (hd->domain);
1774 MHD_stop_daemon (hd->daemon);
1775 if (GNUNET_SCHEDULER_NO_TASK != hd->httpd_task)
1777 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1778 hd->httpd_task = GNUNET_SCHEDULER_NO_TASK;
1780 GNUNET_free_non_null (hd->proxy_cert);
1788 * Task run whenever HTTP server is idle for too long. Kill it.
1790 * @param cls the `struct MhdHttpList *`
1791 * @param tc sched context
1794 kill_httpd_task (void *cls,
1795 const struct GNUNET_SCHEDULER_TaskContext *tc)
1797 struct MhdHttpList *hd = cls;
1799 hd->httpd_task = GNUNET_SCHEDULER_NO_TASK;
1805 * Task run whenever HTTP server operations are pending.
1807 * @param cls the `struct MhdHttpList *` of the daemon that is being run
1808 * @param tc sched context
1811 do_httpd (void *cls,
1812 const struct GNUNET_SCHEDULER_TaskContext *tc);
1816 * Schedule MHD. This function should be called initially when an
1817 * MHD is first getting its client socket, and will then automatically
1818 * always be called later whenever there is work to be done.
1820 * @param hd the daemon to schedule
1823 schedule_httpd (struct MhdHttpList *hd)
1828 struct GNUNET_NETWORK_FDSet *wrs;
1829 struct GNUNET_NETWORK_FDSet *wws;
1832 MHD_UNSIGNED_LONG_LONG timeout;
1833 struct GNUNET_TIME_Relative tv;
1839 if (MHD_YES != MHD_get_fdset (hd->daemon, &rs, &ws, &es, &max))
1844 haveto = MHD_get_timeout (hd->daemon, &timeout);
1845 if (MHD_YES == haveto)
1846 tv.rel_value_us = (uint64_t) timeout * 1000LL;
1848 tv = GNUNET_TIME_UNIT_FOREVER_REL;
1851 wrs = GNUNET_NETWORK_fdset_create ();
1852 wws = GNUNET_NETWORK_fdset_create ();
1853 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
1854 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
1861 if (GNUNET_SCHEDULER_NO_TASK != hd->httpd_task)
1862 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1863 if ( (MHD_YES != haveto) &&
1867 /* daemon is idle, kill after timeout */
1868 hd->httpd_task = GNUNET_SCHEDULER_add_delayed (MHD_CACHE_TIMEOUT,
1875 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1880 GNUNET_NETWORK_fdset_destroy (wrs);
1882 GNUNET_NETWORK_fdset_destroy (wws);
1887 * Task run whenever HTTP server operations are pending.
1889 * @param cls the `struct MhdHttpList` of the daemon that is being run
1890 * @param tc scheduler context
1893 do_httpd (void *cls,
1894 const struct GNUNET_SCHEDULER_TaskContext *tc)
1896 struct MhdHttpList *hd = cls;
1898 hd->httpd_task = GNUNET_SCHEDULER_NO_TASK;
1899 MHD_run (hd->daemon);
1900 schedule_httpd (hd);
1905 * Run MHD now, we have extra data ready for the callback.
1907 * @param hd the daemon to run now.
1910 run_mhd_now (struct MhdHttpList *hd)
1912 if (GNUNET_SCHEDULER_NO_TASK !=
1914 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1915 hd->httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd,
1921 * Read file in filename
1923 * @param filename file to read
1924 * @param size pointer where filesize is stored
1925 * @return NULL on error
1928 load_file (const char* filename,
1935 GNUNET_DISK_file_size (filename, &fsize,
1936 GNUNET_YES, GNUNET_YES))
1938 if (fsize > MAX_PEM_SIZE)
1940 *size = (unsigned int) fsize;
1941 buffer = GNUNET_malloc (*size);
1942 if (fsize != GNUNET_DISK_fn_read (filename, buffer, (size_t) fsize))
1944 GNUNET_free (buffer);
1952 * Load PEM key from file
1954 * @param key where to store the data
1955 * @param keyfile path to the PEM file
1956 * @return #GNUNET_OK on success
1959 load_key_from_file (gnutls_x509_privkey_t key,
1960 const char* keyfile)
1962 gnutls_datum_t key_data;
1965 key_data.data = load_file (keyfile, &key_data.size);
1966 if (NULL == key_data.data)
1967 return GNUNET_SYSERR;
1968 ret = gnutls_x509_privkey_import (key, &key_data,
1969 GNUTLS_X509_FMT_PEM);
1970 if (GNUTLS_E_SUCCESS != ret)
1972 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1973 _("Unable to import private key from file `%s'\n"),
1976 GNUNET_free_non_null (key_data.data);
1977 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
1982 * Load cert from file
1984 * @param crt struct to store data in
1985 * @param certfile path to pem file
1986 * @return #GNUNET_OK on success
1989 load_cert_from_file (gnutls_x509_crt_t crt,
1990 const char* certfile)
1992 gnutls_datum_t cert_data;
1995 cert_data.data = load_file (certfile, &cert_data.size);
1996 if (NULL == cert_data.data)
1997 return GNUNET_SYSERR;
1998 ret = gnutls_x509_crt_import (crt, &cert_data,
1999 GNUTLS_X509_FMT_PEM);
2000 if (GNUTLS_E_SUCCESS != ret)
2002 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2003 _("Unable to import certificate %s\n"), certfile);
2005 GNUNET_free_non_null (cert_data.data);
2006 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2011 * Generate new certificate for specific name
2013 * @param name the subject name to generate a cert for
2014 * @return a struct holding the PEM data, NULL on error
2016 static struct ProxyGNSCertificate *
2017 generate_gns_certificate (const char *name)
2019 unsigned int serial;
2020 size_t key_buf_size;
2021 size_t cert_buf_size;
2022 gnutls_x509_crt_t request;
2025 struct ProxyGNSCertificate *pgc;
2027 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2028 "Generating TLS/SSL certificate for `%s'\n",
2030 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_init (&request));
2031 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_key (request, proxy_ca.key));
2032 pgc = GNUNET_new (struct ProxyGNSCertificate);
2033 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COUNTRY_NAME,
2035 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_ORGANIZATION_NAME,
2036 0, "GNU Name System", 4);
2037 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COMMON_NAME,
2038 0, name, strlen (name));
2039 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_version (request, 3));
2040 gnutls_rnd (GNUTLS_RND_NONCE, &serial, sizeof (serial));
2041 gnutls_x509_crt_set_serial (request,
2044 etime = time (NULL);
2045 tm_data = localtime (&etime);
2046 gnutls_x509_crt_set_activation_time (request,
2049 etime = mktime (tm_data);
2050 gnutls_x509_crt_set_expiration_time (request,
2052 gnutls_x509_crt_sign (request,
2055 key_buf_size = sizeof (pgc->key);
2056 cert_buf_size = sizeof (pgc->cert);
2057 gnutls_x509_crt_export (request, GNUTLS_X509_FMT_PEM,
2058 pgc->cert, &cert_buf_size);
2059 gnutls_x509_privkey_export (proxy_ca.key, GNUTLS_X509_FMT_PEM,
2060 pgc->key, &key_buf_size);
2061 gnutls_x509_crt_deinit (request);
2067 * Function called by MHD with errors, suppresses them all.
2069 * @param cls closure
2070 * @param fm format string (`printf()`-style)
2071 * @param ap arguments to @a fm
2074 mhd_error_log_callback (void *cls,
2083 * Lookup (or create) an SSL MHD instance for a particular domain.
2085 * @param domain the domain the SSL daemon has to serve
2086 * @return NULL on error
2088 static struct MhdHttpList *
2089 lookup_ssl_httpd (const char* domain)
2091 struct MhdHttpList *hd;
2092 struct ProxyGNSCertificate *pgc;
2099 for (hd = mhd_httpd_head; NULL != hd; hd = hd->next)
2100 if ( (NULL != hd->domain) &&
2101 (0 == strcmp (hd->domain, domain)) )
2103 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2104 "Starting fresh MHD HTTPS instance for domain `%s'\n",
2106 pgc = generate_gns_certificate (domain);
2107 hd = GNUNET_new (struct MhdHttpList);
2108 hd->is_ssl = GNUNET_YES;
2109 hd->domain = GNUNET_strdup (domain);
2110 hd->proxy_cert = pgc;
2111 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_SSL | MHD_USE_NO_LISTEN_SOCKET,
2114 &create_response, hd,
2115 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
2116 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
2117 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
2118 MHD_OPTION_EXTERNAL_LOGGER, &mhd_error_log_callback, NULL,
2119 MHD_OPTION_HTTPS_MEM_KEY, pgc->key,
2120 MHD_OPTION_HTTPS_MEM_CERT, pgc->cert,
2122 if (NULL == hd->daemon)
2128 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
2136 * Task run when a Socks5Request somehow fails to be associated with
2137 * an MHD connection (i.e. because the client never speaks HTTP after
2138 * the SOCKS5 handshake). Clean up.
2140 * @param cls the `struct Socks5Request *`
2141 * @param tc sched context
2144 timeout_s5r_handshake (void *cls,
2145 const struct GNUNET_SCHEDULER_TaskContext *tc)
2147 struct Socks5Request *s5r = cls;
2149 s5r->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2155 * We're done with the Socks5 protocol, now we need to pass the
2156 * connection data through to the final destination, either
2157 * direct (if the protocol might not be HTTP), or via MHD
2158 * (if the port looks like it should be HTTP).
2160 * @param s5r socks request that has reached the final stage
2163 setup_data_transfer (struct Socks5Request *s5r)
2165 struct MhdHttpList *hd;
2167 const struct sockaddr *addr;
2173 hd = lookup_ssl_httpd (s5r->domain);
2176 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2177 _("Failed to start HTTPS server for `%s'\n"),
2185 GNUNET_assert (NULL != httpd);
2189 fd = GNUNET_NETWORK_get_fd (s5r->sock);
2190 addr = GNUNET_NETWORK_get_addr (s5r->sock);
2191 len = GNUNET_NETWORK_get_addrlen (s5r->sock);
2192 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2193 if (MHD_YES != MHD_add_connection (hd->daemon, fd, addr, len))
2195 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2196 _("Failed to pass client to MHD\n"));
2201 schedule_httpd (hd);
2202 s5r->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_HANDSHAKE_TIMEOUT,
2203 &timeout_s5r_handshake,
2208 /* ********************* SOCKS handling ************************* */
2212 * Write data from buffer to socks5 client, then continue with state machine.
2214 * @param cls the closure with the `struct Socks5Request`
2215 * @param tc scheduler context
2218 do_write (void *cls,
2219 const struct GNUNET_SCHEDULER_TaskContext *tc)
2221 struct Socks5Request *s5r = cls;
2224 s5r->wtask = GNUNET_SCHEDULER_NO_TASK;
2225 len = GNUNET_NETWORK_socket_send (s5r->sock,
2230 /* write error: connection closed, shutdown, etc.; just clean up */
2236 s5r->wbuf_len - len);
2237 s5r->wbuf_len -= len;
2238 if (s5r->wbuf_len > 0)
2240 /* not done writing */
2242 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2248 /* we're done writing, continue with state machine! */
2255 case SOCKS5_REQUEST:
2256 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != s5r->rtask);
2258 case SOCKS5_DATA_TRANSFER:
2259 setup_data_transfer (s5r);
2261 case SOCKS5_WRITE_THEN_CLEANUP:
2272 * Return a server response message indicating a failure to the client.
2274 * @param s5r request to return failure code for
2275 * @param sc status code to return
2278 signal_socks_failure (struct Socks5Request *s5r,
2279 enum Socks5StatusCode sc)
2281 struct Socks5ServerResponseMessage *s_resp;
2283 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2284 memset (s_resp, 0, sizeof (struct Socks5ServerResponseMessage));
2285 s_resp->version = SOCKS_VERSION_5;
2287 s5r->state = SOCKS5_WRITE_THEN_CLEANUP;
2288 if (GNUNET_SCHEDULER_NO_TASK != s5r->wtask)
2290 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2297 * Return a server response message indicating success.
2299 * @param s5r request to return success status message for
2302 signal_socks_success (struct Socks5Request *s5r)
2304 struct Socks5ServerResponseMessage *s_resp;
2306 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2307 s_resp->version = SOCKS_VERSION_5;
2308 s_resp->reply = SOCKS5_STATUS_REQUEST_GRANTED;
2309 s_resp->reserved = 0;
2310 s_resp->addr_type = SOCKS5_AT_IPV4;
2311 /* zero out IPv4 address and port */
2314 sizeof (struct in_addr) + sizeof (uint16_t));
2315 s5r->wbuf_len += sizeof (struct Socks5ServerResponseMessage) +
2316 sizeof (struct in_addr) + sizeof (uint16_t);
2317 if (GNUNET_SCHEDULER_NO_TASK == s5r->wtask)
2319 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2326 * Process GNS results for target domain.
2328 * @param cls the `struct Socks5Request *`
2329 * @param rd_count number of records returned
2330 * @param rd record data
2333 handle_gns_result (void *cls,
2335 const struct GNUNET_GNSRECORD_Data *rd)
2337 struct Socks5Request *s5r = cls;
2339 const struct GNUNET_GNSRECORD_Data *r;
2342 s5r->gns_lookup = NULL;
2344 for (i=0;i<rd_count;i++)
2347 switch (r->record_type)
2349 case GNUNET_DNSPARSER_TYPE_A:
2351 struct sockaddr_in *in;
2353 if (sizeof (struct in_addr) != r->data_size)
2355 GNUNET_break_op (0);
2358 if (GNUNET_YES == got_ip)
2361 GNUNET_NETWORK_test_pf (PF_INET))
2363 got_ip = GNUNET_YES;
2364 in = (struct sockaddr_in *) &s5r->destination_address;
2365 in->sin_family = AF_INET;
2366 memcpy (&in->sin_addr,
2369 in->sin_port = htons (s5r->port);
2370 #if HAVE_SOCKADDR_IN_SIN_LEN
2371 in->sin_len = sizeof (*in);
2375 case GNUNET_DNSPARSER_TYPE_AAAA:
2377 struct sockaddr_in6 *in;
2379 if (sizeof (struct in6_addr) != r->data_size)
2381 GNUNET_break_op (0);
2384 if (GNUNET_YES == got_ip)
2387 GNUNET_NETWORK_test_pf (PF_INET))
2389 /* FIXME: allow user to disable IPv6 per configuration option... */
2390 got_ip = GNUNET_YES;
2391 in = (struct sockaddr_in6 *) &s5r->destination_address;
2392 in->sin6_family = AF_INET6;
2393 memcpy (&in->sin6_addr,
2396 in->sin6_port = htons (s5r->port);
2397 #if HAVE_SOCKADDR_IN_SIN_LEN
2398 in->sin6_len = sizeof (*in);
2402 case GNUNET_GNSRECORD_TYPE_VPN:
2403 GNUNET_break (0); /* should have been translated within GNS */
2405 case GNUNET_GNSRECORD_TYPE_LEHO:
2406 GNUNET_free_non_null (s5r->leho);
2407 s5r->leho = GNUNET_strndup (r->data,
2410 case GNUNET_GNSRECORD_TYPE_BOX:
2412 const struct GNUNET_GNSRECORD_BoxRecord *box;
2414 if (r->data_size < sizeof (struct GNUNET_GNSRECORD_BoxRecord))
2416 GNUNET_break_op (0);
2420 if ( (ntohl (box->record_type) != GNUNET_DNSPARSER_TYPE_TLSA) ||
2421 (ntohs (box->protocol) != IPPROTO_TCP) ||
2422 (ntohs (box->service) != s5r->port) )
2423 break; /* BOX record does not apply */
2424 GNUNET_free_non_null (s5r->dane_data);
2425 s5r->dane_data_len = r->data_size - sizeof (struct GNUNET_GNSRECORD_BoxRecord);
2426 s5r->dane_data = GNUNET_malloc (s5r->dane_data_len);
2427 memcpy (s5r->dane_data,
2429 s5r->dane_data_len);
2437 if (GNUNET_YES != got_ip)
2439 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2440 "Name resolution failed to yield useful IP address.\n");
2441 signal_socks_failure (s5r,
2442 SOCKS5_STATUS_GENERAL_FAILURE);
2445 s5r->state = SOCKS5_DATA_TRANSFER;
2446 signal_socks_success (s5r);
2451 * Remove the first @a len bytes from the beginning of the read buffer.
2453 * @param s5r the handle clear the read buffer for
2454 * @param len number of bytes in read buffer to advance
2457 clear_from_s5r_rbuf (struct Socks5Request *s5r,
2460 GNUNET_assert (len <= s5r->rbuf_len);
2463 s5r->rbuf_len - len);
2464 s5r->rbuf_len -= len;
2469 * Read data from incoming Socks5 connection
2471 * @param cls the closure with the `struct Socks5Request`
2472 * @param tc the scheduler context
2475 do_s5r_read (void *cls,
2476 const struct GNUNET_SCHEDULER_TaskContext *tc)
2478 struct Socks5Request *s5r = cls;
2479 const struct Socks5ClientHelloMessage *c_hello;
2480 struct Socks5ServerHelloMessage *s_hello;
2481 const struct Socks5ClientRequestMessage *c_req;
2485 s5r->rtask = GNUNET_SCHEDULER_NO_TASK;
2486 if ( (NULL != tc->read_ready) &&
2487 (GNUNET_NETWORK_fdset_isset (tc->read_ready, s5r->sock)) )
2489 rlen = GNUNET_NETWORK_socket_recv (s5r->sock,
2490 &s5r->rbuf[s5r->rbuf_len],
2491 sizeof (s5r->rbuf) - s5r->rbuf_len);
2494 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2495 "socks5 client disconnected.\n");
2499 s5r->rbuf_len += rlen;
2501 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2504 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2505 "Processing %u bytes of socks data in state %d\n",
2511 c_hello = (const struct Socks5ClientHelloMessage*) &s5r->rbuf;
2512 if ( (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage)) ||
2513 (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods) )
2514 return; /* need more data */
2515 if (SOCKS_VERSION_5 != c_hello->version)
2517 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2518 _("Unsupported socks version %d\n"),
2519 (int) c_hello->version);
2523 clear_from_s5r_rbuf (s5r,
2524 sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods);
2525 GNUNET_assert (0 == s5r->wbuf_len);
2526 s_hello = (struct Socks5ServerHelloMessage *) &s5r->wbuf;
2527 s5r->wbuf_len = sizeof (struct Socks5ServerHelloMessage);
2528 s_hello->version = SOCKS_VERSION_5;
2529 s_hello->auth_method = SOCKS_AUTH_NONE;
2530 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == s5r->wtask);
2531 s5r->wtask = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2534 s5r->state = SOCKS5_REQUEST;
2536 case SOCKS5_REQUEST:
2537 c_req = (const struct Socks5ClientRequestMessage *) &s5r->rbuf;
2538 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage))
2540 switch (c_req->command)
2542 case SOCKS5_CMD_TCP_STREAM:
2546 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2547 _("Unsupported socks command %d\n"),
2548 (int) c_req->command);
2549 signal_socks_failure (s5r,
2550 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED);
2553 switch (c_req->addr_type)
2555 case SOCKS5_AT_IPV4:
2557 const struct in_addr *v4 = (const struct in_addr *) &c_req[1];
2558 const uint16_t *port = (const uint16_t *) &v4[1];
2559 struct sockaddr_in *in;
2561 s5r->port = ntohs (*port);
2562 if (HTTPS_PORT == s5r->port)
2564 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2565 _("SSL connection to plain IPv4 address requested\n"));
2566 signal_socks_failure (s5r,
2567 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE);
2570 alen = sizeof (struct in_addr);
2571 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2572 alen + sizeof (uint16_t))
2573 return; /* need more data */
2574 in = (struct sockaddr_in *) &s5r->destination_address;
2575 in->sin_family = AF_INET;
2577 in->sin_port = *port;
2578 #if HAVE_SOCKADDR_IN_SIN_LEN
2579 in->sin_len = sizeof (*in);
2581 s5r->state = SOCKS5_DATA_TRANSFER;
2584 case SOCKS5_AT_IPV6:
2586 const struct in6_addr *v6 = (const struct in6_addr *) &c_req[1];
2587 const uint16_t *port = (const uint16_t *) &v6[1];
2588 struct sockaddr_in6 *in;
2590 s5r->port = ntohs (*port);
2591 if (HTTPS_PORT == s5r->port)
2593 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2594 _("SSL connection to plain IPv4 address requested\n"));
2595 signal_socks_failure (s5r,
2596 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE);
2599 alen = sizeof (struct in6_addr);
2600 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2601 alen + sizeof (uint16_t))
2602 return; /* need more data */
2603 in = (struct sockaddr_in6 *) &s5r->destination_address;
2604 in->sin6_family = AF_INET6;
2605 in->sin6_addr = *v6;
2606 in->sin6_port = *port;
2607 #if HAVE_SOCKADDR_IN_SIN_LEN
2608 in->sin6_len = sizeof (*in);
2610 s5r->state = SOCKS5_DATA_TRANSFER;
2613 case SOCKS5_AT_DOMAINNAME:
2615 const uint8_t *dom_len;
2616 const char *dom_name;
2617 const uint16_t *port;
2619 dom_len = (const uint8_t *) &c_req[1];
2620 alen = *dom_len + 1;
2621 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2622 alen + sizeof (uint16_t))
2623 return; /* need more data */
2624 dom_name = (const char *) &dom_len[1];
2625 port = (const uint16_t*) &dom_name[*dom_len];
2626 s5r->domain = GNUNET_strndup (dom_name, *dom_len);
2627 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2628 "Requested connection is to %s:%d\n",
2631 s5r->state = SOCKS5_RESOLVING;
2632 s5r->port = ntohs (*port);
2633 s5r->gns_lookup = GNUNET_GNS_lookup (gns_handle,
2636 GNUNET_DNSPARSER_TYPE_A,
2637 GNUNET_NO /* only cached */,
2638 (GNUNET_YES == do_shorten) ? &local_shorten_zone : NULL,
2644 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2645 _("Unsupported socks address type %d\n"),
2646 (int) c_req->addr_type);
2647 signal_socks_failure (s5r,
2648 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED);
2651 clear_from_s5r_rbuf (s5r,
2652 sizeof (struct Socks5ClientRequestMessage) +
2653 alen + sizeof (uint16_t));
2654 if (0 != s5r->rbuf_len)
2656 /* read more bytes than healthy, why did the client send more!? */
2657 GNUNET_break_op (0);
2658 signal_socks_failure (s5r,
2659 SOCKS5_STATUS_GENERAL_FAILURE);
2662 if (SOCKS5_DATA_TRANSFER == s5r->state)
2664 /* if we are not waiting for GNS resolution, signal success */
2665 signal_socks_success (s5r);
2667 /* We are done reading right now */
2668 GNUNET_SCHEDULER_cancel (s5r->rtask);
2669 s5r->rtask = GNUNET_SCHEDULER_NO_TASK;
2671 case SOCKS5_RESOLVING:
2674 case SOCKS5_DATA_TRANSFER:
2685 * Accept new incoming connections
2687 * @param cls the closure with the lsock4 or lsock6
2688 * @param tc the scheduler context
2691 do_accept (void *cls,
2692 const struct GNUNET_SCHEDULER_TaskContext *tc)
2694 struct GNUNET_NETWORK_Handle *lsock = cls;
2695 struct GNUNET_NETWORK_Handle *s;
2696 struct Socks5Request *s5r;
2698 if (lsock == lsock4)
2699 ltask4 = GNUNET_SCHEDULER_NO_TASK;
2701 ltask6 = GNUNET_SCHEDULER_NO_TASK;
2702 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2704 if (lsock == lsock4)
2705 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2709 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2712 s = GNUNET_NETWORK_socket_accept (lsock, NULL, NULL);
2715 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "accept");
2718 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2719 "Got an inbound connection, waiting for data\n");
2720 s5r = GNUNET_new (struct Socks5Request);
2721 GNUNET_CONTAINER_DLL_insert (s5r_head,
2725 s5r->state = SOCKS5_INIT;
2726 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2732 /* ******************* General / main code ********************* */
2736 * Task run on shutdown
2738 * @param cls closure
2739 * @param tc task context
2742 do_shutdown (void *cls,
2743 const struct GNUNET_SCHEDULER_TaskContext *tc)
2745 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2746 "Shutting down...\n");
2747 while (NULL != mhd_httpd_head)
2748 kill_httpd (mhd_httpd_head);
2749 while (NULL != s5r_head)
2750 cleanup_s5r (s5r_head);
2753 GNUNET_NETWORK_socket_close (lsock4);
2758 GNUNET_NETWORK_socket_close (lsock6);
2763 GNUNET_IDENTITY_cancel (id_op);
2766 if (NULL != identity)
2768 GNUNET_IDENTITY_disconnect (identity);
2771 if (NULL != curl_multi)
2773 curl_multi_cleanup (curl_multi);
2776 if (NULL != gns_handle)
2778 GNUNET_GNS_disconnect (gns_handle);
2781 if (GNUNET_SCHEDULER_NO_TASK != curl_download_task)
2783 GNUNET_SCHEDULER_cancel (curl_download_task);
2784 curl_download_task = GNUNET_SCHEDULER_NO_TASK;
2786 if (GNUNET_SCHEDULER_NO_TASK != ltask4)
2788 GNUNET_SCHEDULER_cancel (ltask4);
2789 ltask4 = GNUNET_SCHEDULER_NO_TASK;
2791 if (GNUNET_SCHEDULER_NO_TASK != ltask6)
2793 GNUNET_SCHEDULER_cancel (ltask6);
2794 ltask6 = GNUNET_SCHEDULER_NO_TASK;
2796 gnutls_x509_crt_deinit (proxy_ca.cert);
2797 gnutls_x509_privkey_deinit (proxy_ca.key);
2798 gnutls_global_deinit ();
2803 * Create an IPv4 listen socket bound to our port.
2805 * @return NULL on error
2807 static struct GNUNET_NETWORK_Handle *
2810 struct GNUNET_NETWORK_Handle *ls;
2811 struct sockaddr_in sa4;
2814 memset (&sa4, 0, sizeof (sa4));
2815 sa4.sin_family = AF_INET;
2816 sa4.sin_port = htons (port);
2817 #if HAVE_SOCKADDR_IN_SIN_LEN
2818 sa4.sin_len = sizeof (sa4);
2820 ls = GNUNET_NETWORK_socket_create (AF_INET,
2826 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa4,
2830 GNUNET_NETWORK_socket_close (ls);
2839 * Create an IPv6 listen socket bound to our port.
2841 * @return NULL on error
2843 static struct GNUNET_NETWORK_Handle *
2846 struct GNUNET_NETWORK_Handle *ls;
2847 struct sockaddr_in6 sa6;
2850 memset (&sa6, 0, sizeof (sa6));
2851 sa6.sin6_family = AF_INET6;
2852 sa6.sin6_port = htons (port);
2853 #if HAVE_SOCKADDR_IN_SIN_LEN
2854 sa6.sin6_len = sizeof (sa6);
2856 ls = GNUNET_NETWORK_socket_create (AF_INET6,
2862 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa6,
2866 GNUNET_NETWORK_socket_close (ls);
2875 * Continue initialization after we have our zone information.
2880 struct MhdHttpList *hd;
2882 /* Open listen socket for socks proxy */
2883 lsock6 = bind_v6 ();
2885 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
2888 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock6, 5))
2890 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
2891 GNUNET_NETWORK_socket_close (lsock6);
2896 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2897 lsock6, &do_accept, lsock6);
2900 lsock4 = bind_v4 ();
2902 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
2905 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock4, 5))
2907 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
2908 GNUNET_NETWORK_socket_close (lsock4);
2913 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2914 lsock4, &do_accept, lsock4);
2917 if ( (NULL == lsock4) &&
2920 GNUNET_SCHEDULER_shutdown ();
2923 if (0 != curl_global_init (CURL_GLOBAL_WIN32))
2925 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2926 "cURL global init failed!\n");
2927 GNUNET_SCHEDULER_shutdown ();
2930 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2931 "Proxy listens on port %u\n",
2934 /* start MHD daemon for HTTP */
2935 hd = GNUNET_new (struct MhdHttpList);
2936 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_NO_LISTEN_SOCKET,
2939 &create_response, hd,
2940 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
2941 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
2942 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
2944 if (NULL == hd->daemon)
2947 GNUNET_SCHEDULER_shutdown ();
2951 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head, mhd_httpd_tail, hd);
2956 * Method called to inform about the egos of the shorten zone of this peer.
2958 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
2959 * this function is only called ONCE, and 'NULL' being passed in
2960 * @a ego does indicate an error (i.e. name is taken or no default
2961 * value is known). If @a ego is non-NULL and if '*ctx'
2962 * is set in those callbacks, the value WILL be passed to a subsequent
2963 * call to the identity callback of #GNUNET_IDENTITY_connect (if
2964 * that one was not NULL).
2966 * @param cls closure, NULL
2967 * @param ego ego handle
2968 * @param ctx context for application to store data for this ego
2969 * (during the lifetime of this process, initially NULL)
2970 * @param name name assigned by the user for this ego,
2971 * NULL if the user just deleted the ego and it
2972 * must thus no longer be used
2975 identity_shorten_cb (void *cls,
2976 struct GNUNET_IDENTITY_Ego *ego,
2983 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2984 _("No ego configured for `shorten-zone`\n"));
2988 local_shorten_zone = *GNUNET_IDENTITY_ego_get_private_key (ego);
2989 do_shorten = GNUNET_YES;
2996 * Method called to inform about the egos of the master zone of this peer.
2998 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
2999 * this function is only called ONCE, and 'NULL' being passed in
3000 * @a ego does indicate an error (i.e. name is taken or no default
3001 * value is known). If @a ego is non-NULL and if '*ctx'
3002 * is set in those callbacks, the value WILL be passed to a subsequent
3003 * call to the identity callback of #GNUNET_IDENTITY_connect (if
3004 * that one was not NULL).
3006 * @param cls closure, NULL
3007 * @param ego ego handle
3008 * @param ctx context for application to store data for this ego
3009 * (during the lifetime of this process, initially NULL)
3010 * @param name name assigned by the user for this ego,
3011 * NULL if the user just deleted the ego and it
3012 * must thus no longer be used
3015 identity_master_cb (void *cls,
3016 struct GNUNET_IDENTITY_Ego *ego,
3023 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3024 _("No ego configured for `%s`\n"),
3026 GNUNET_SCHEDULER_shutdown ();
3029 GNUNET_IDENTITY_ego_get_public_key (ego,
3031 id_op = GNUNET_IDENTITY_get (identity,
3033 &identity_shorten_cb,
3039 * Main function that will be run
3041 * @param cls closure
3042 * @param args remaining command-line arguments
3043 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
3044 * @param c configuration
3047 run (void *cls, char *const *args, const char *cfgfile,
3048 const struct GNUNET_CONFIGURATION_Handle *c)
3050 char* cafile_cfg = NULL;
3055 if (NULL == (curl_multi = curl_multi_init ()))
3057 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3058 "Failed to create cURL multi handle!\n");
3061 cafile = cafile_opt;
3064 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "gns-proxy",
3068 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
3073 cafile = cafile_cfg;
3075 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3076 "Using %s as CA\n", cafile);
3078 gnutls_global_init ();
3079 gnutls_x509_crt_init (&proxy_ca.cert);
3080 gnutls_x509_privkey_init (&proxy_ca.key);
3082 if ( (GNUNET_OK != load_cert_from_file (proxy_ca.cert, cafile)) ||
3083 (GNUNET_OK != load_key_from_file (proxy_ca.key, cafile)) )
3085 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3086 _("Failed to load SSL/TLS key and certificate from `%s'\n"),
3088 gnutls_x509_crt_deinit (proxy_ca.cert);
3089 gnutls_x509_privkey_deinit (proxy_ca.key);
3090 gnutls_global_deinit ();
3091 GNUNET_free_non_null (cafile_cfg);
3094 GNUNET_free_non_null (cafile_cfg);
3095 if (NULL == (gns_handle = GNUNET_GNS_connect (cfg)))
3097 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3098 "Unable to connect to GNS!\n");
3099 gnutls_x509_crt_deinit (proxy_ca.cert);
3100 gnutls_x509_privkey_deinit (proxy_ca.key);
3101 gnutls_global_deinit ();
3104 identity = GNUNET_IDENTITY_connect (cfg,
3106 id_op = GNUNET_IDENTITY_get (identity,
3108 &identity_master_cb,
3110 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
3111 &do_shutdown, NULL);
3116 * The main function for gnunet-gns-proxy.
3118 * @param argc number of arguments from the command line
3119 * @param argv command line arguments
3120 * @return 0 ok, 1 on error
3123 main (int argc, char *const *argv)
3125 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
3127 gettext_noop ("listen on specified port (default: 7777)"), 1,
3128 &GNUNET_GETOPT_set_ulong, &port},
3129 {'a', "authority", NULL,
3130 gettext_noop ("pem file to use as CA"), 1,
3131 &GNUNET_GETOPT_set_string, &cafile_opt},
3132 GNUNET_GETOPT_OPTION_END
3134 static const char* page =
3135 "<html><head><title>gnunet-gns-proxy</title>"
3136 "</head><body>cURL fail</body></html>";
3139 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
3141 GNUNET_log_setup ("gnunet-gns-proxy", "WARNING", NULL);
3142 curl_failure_response = MHD_create_response_from_buffer (strlen (page),
3144 MHD_RESPMEM_PERSISTENT);
3148 GNUNET_PROGRAM_run (argc, argv, "gnunet-gns-proxy",
3149 _("GNUnet GNS proxy"),
3151 &run, NULL)) ? 0 : 1;
3152 MHD_destroy_response (curl_failure_response);
3153 GNUNET_free_non_null ((char *) argv);
3154 GNUNET_CRYPTO_ecdsa_key_clear (&local_shorten_zone);
3158 /* end of gnunet-gns-proxy.c */