2 This file is part of GNUnet.
3 (C) 2012-2013 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
29 * - actually check SSL certificates (#3038)
32 #include <microhttpd.h>
33 #include <curl/curl.h>
34 #include <gnutls/gnutls.h>
35 #include <gnutls/x509.h>
36 #include <gnutls/abstract.h>
37 #include <gnutls/crypto.h>
39 #include "gnunet_util_lib.h"
40 #include "gnunet_gns_service.h"
41 #include "gnunet_identity_service.h"
46 * Default Socks5 listen port.
48 #define GNUNET_GNS_PROXY_PORT 7777
51 * Maximum supported length for a URI.
52 * Should die. @deprecated
54 #define MAX_HTTP_URI_LENGTH 2048
57 * Size of the buffer for the data upload / download. Must be
58 * enough for curl, thus CURL_MAX_WRITE_SIZE is needed here (16k).
60 #define IO_BUFFERSIZE CURL_MAX_WRITE_SIZE
63 * Size of the read/write buffers for Socks. Uses
64 * 256 bytes for the hostname (at most), plus a few
65 * bytes overhead for the messages.
67 #define SOCKS_BUFFERSIZE (256 + 32)
70 * Port for plaintext HTTP.
77 #define HTTPS_PORT 443
80 * Largest allowed size for a PEM certificate.
82 #define MAX_PEM_SIZE (10 * 1024)
85 * After how long do we clean up unused MHD SSL/TLS instances?
87 #define MHD_CACHE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
90 * After how long do we clean up Socks5 handles that failed to show any activity
91 * with their respective MHD instance?
93 #define HTTP_HANDSHAKE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
99 * @param level log level
100 * @param fun name of curl_easy-function that gave the error
101 * @param rc return code from curl
103 #define LOG_CURL_EASY(level,fun,rc) GNUNET_log(level, _("%s failed at %s:%d: `%s'\n"), fun, __FILE__, __LINE__, curl_easy_strerror (rc))
106 /* *************** Socks protocol definitions (move to TUN?) ****************** */
109 * Which SOCKS version do we speak?
111 #define SOCKS_VERSION_5 0x05
114 * Flag to set for 'no authentication'.
116 #define SOCKS_AUTH_NONE 0
120 * Commands in Socks5.
125 * Establish TCP/IP stream.
127 SOCKS5_CMD_TCP_STREAM = 1,
130 * Establish TCP port binding.
132 SOCKS5_CMD_TCP_PORT = 2,
135 * Establish UDP port binding.
137 SOCKS5_CMD_UDP_PORT = 3
142 * Address types in Socks5.
144 enum Socks5AddressType
154 SOCKS5_AT_DOMAINNAME = 3,
165 * Status codes in Socks5 response.
167 enum Socks5StatusCode
169 SOCKS5_STATUS_REQUEST_GRANTED = 0,
170 SOCKS5_STATUS_GENERAL_FAILURE = 1,
171 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE = 2,
172 SOCKS5_STATUS_NETWORK_UNREACHABLE = 3,
173 SOCKS5_STATUS_HOST_UNREACHABLE = 4,
174 SOCKS5_STATUS_CONNECTION_REFUSED_BY_HOST = 5,
175 SOCKS5_STATUS_TTL_EXPIRED = 6,
176 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED = 7,
177 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED = 8
182 * Client hello in Socks5 protocol.
184 struct Socks5ClientHelloMessage
187 * Should be #SOCKS_VERSION_5.
192 * How many authentication methods does the client support.
194 uint8_t num_auth_methods;
196 /* followed by supported authentication methods, 1 byte per method */
202 * Server hello in Socks5 protocol.
204 struct Socks5ServerHelloMessage
207 * Should be #SOCKS_VERSION_5.
212 * Chosen authentication method, for us always #SOCKS_AUTH_NONE,
213 * which skips the authentication step.
220 * Client socks request in Socks5 protocol.
222 struct Socks5ClientRequestMessage
225 * Should be #SOCKS_VERSION_5.
230 * Command code, we only uspport #SOCKS5_CMD_TCP_STREAM.
235 * Reserved, always zero.
240 * Address type, an `enum Socks5AddressType`.
245 * Followed by either an ip4/ipv6 address or a domain name with a
246 * length field (uint8_t) in front (depending on @e addr_type).
247 * followed by port number in network byte order (uint16_t).
253 * Server response to client requests in Socks5 protocol.
255 struct Socks5ServerResponseMessage
258 * Should be #SOCKS_VERSION_5.
263 * Status code, an `enum Socks5StatusCode`
273 * Address type, an `enum Socks5AddressType`.
278 * Followed by either an ip4/ipv6 address or a domain name with a
279 * length field (uint8_t) in front (depending on @e addr_type).
280 * followed by port number in network byte order (uint16_t).
287 /* *********************** Datastructures for HTTP handling ****************** */
290 * A structure for CA cert/key
297 gnutls_x509_crt_t cert;
302 gnutls_x509_privkey_t key;
307 * Structure for GNS certificates
309 struct ProxyGNSCertificate
312 * The certificate as PEM
314 char cert[MAX_PEM_SIZE];
317 * The private key as PEM
319 char key[MAX_PEM_SIZE];
325 * A structure for all running Httpds
332 struct MhdHttpList *prev;
337 struct MhdHttpList *next;
340 * the domain name to server (only important for SSL)
347 struct MHD_Daemon *daemon;
350 * Optional proxy certificate used
352 struct ProxyGNSCertificate *proxy_cert;
357 GNUNET_SCHEDULER_TaskIdentifier httpd_task;
360 * is this an ssl daemon?
367 /* ***************** Datastructures for Socks handling **************** */
376 * We're waiting to get the client hello.
381 * We're waiting to get the initial request.
386 * We are currently resolving the destination.
391 * We're in transfer mode.
393 SOCKS5_DATA_TRANSFER,
396 * Finish writing the write buffer, then clean up.
398 SOCKS5_WRITE_THEN_CLEANUP,
401 * Socket has been passed to MHD, do not close it anymore.
403 SOCKS5_SOCKET_WITH_MHD,
406 * We've finished receiving upload data from MHD.
408 SOCKS5_SOCKET_UPLOAD_STARTED,
411 * We've finished receiving upload data from MHD.
413 SOCKS5_SOCKET_UPLOAD_DONE,
416 * We've finished uploading data via CURL and can now download.
418 SOCKS5_SOCKET_DOWNLOAD_STARTED,
421 * We've finished receiving download data from cURL.
423 SOCKS5_SOCKET_DOWNLOAD_DONE
429 * A structure for socks requests
437 struct Socks5Request *next;
442 struct Socks5Request *prev;
447 struct GNUNET_NETWORK_Handle *sock;
450 * Handle to GNS lookup, during #SOCKS5_RESOLVING phase.
452 struct GNUNET_GNS_LookupRequest *gns_lookup;
455 * Client socket read task
457 GNUNET_SCHEDULER_TaskIdentifier rtask;
460 * Client socket write task
462 GNUNET_SCHEDULER_TaskIdentifier wtask;
467 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
472 char rbuf[SOCKS_BUFFERSIZE];
477 char wbuf[SOCKS_BUFFERSIZE];
480 * Buffer we use for moving data between MHD and curl (in both directions).
482 char io_buf[IO_BUFFERSIZE];
485 * MHD HTTP instance handling this request, NULL for none.
487 struct MhdHttpList *hd;
490 * MHD response object for this request.
492 struct MHD_Response *response;
495 * the domain name to server (only important for SSL)
500 * DNS Legacy Host Name as given by GNS, NULL if not given.
515 * HTTP request headers for the curl request.
517 struct curl_slist *headers;
520 * HTTP response code to give to MHD for the response.
522 unsigned int response_code;
525 * Number of bytes already in read buffer
530 * Number of bytes already in write buffer
535 * Number of bytes already in the IO buffer.
540 * Once known, what's the target address for the connection?
542 struct sockaddr_storage destination_address;
547 enum SocksPhase state;
550 * Desired destination port.
558 /* *********************** Globals **************************** */
562 * The port the proxy is running on (default 7777)
564 static unsigned long port = GNUNET_GNS_PROXY_PORT;
567 * The CA file (pem) to use for the proxy CA
569 static char *cafile_opt;
572 * The listen socket of the proxy for IPv4
574 static struct GNUNET_NETWORK_Handle *lsock4;
577 * The listen socket of the proxy for IPv6
579 static struct GNUNET_NETWORK_Handle *lsock6;
582 * The listen task ID for IPv4
584 static GNUNET_SCHEDULER_TaskIdentifier ltask4;
587 * The listen task ID for IPv6
589 static GNUNET_SCHEDULER_TaskIdentifier ltask6;
592 * The cURL download task (curl multi API).
594 static GNUNET_SCHEDULER_TaskIdentifier curl_download_task;
597 * The cURL multi handle
599 static CURLM *curl_multi;
602 * Handle to the GNS service
604 static struct GNUNET_GNS_Handle *gns_handle;
607 * DLL for http/https daemons
609 static struct MhdHttpList *mhd_httpd_head;
612 * DLL for http/https daemons
614 static struct MhdHttpList *mhd_httpd_tail;
617 * Daemon for HTTP (we have one per SSL certificate, and then one for
618 * all HTTP connections; this is the one for HTTP, not HTTPS).
620 static struct MhdHttpList *httpd;
623 * DLL of active socks requests.
625 static struct Socks5Request *s5r_head;
628 * DLL of active socks requests.
630 static struct Socks5Request *s5r_tail;
633 * The users local GNS master zone
635 static struct GNUNET_CRYPTO_EcdsaPublicKey local_gns_zone;
638 * The users local shorten zone
640 static struct GNUNET_CRYPTO_EcdsaPrivateKey local_shorten_zone;
643 * Is shortening enabled?
645 static int do_shorten;
648 * The CA for SSL certificate generation
650 static struct ProxyCA proxy_ca;
653 * Response we return on cURL failures.
655 static struct MHD_Response *curl_failure_response;
658 * Connection to identity service.
660 static struct GNUNET_IDENTITY_Handle *identity;
663 * Request for our ego.
665 static struct GNUNET_IDENTITY_Operation *id_op;
670 static const struct GNUNET_CONFIGURATION_Handle *cfg;
673 /* ************************* Global helpers ********************* */
677 * Run MHD now, we have extra data ready for the callback.
679 * @param hd the daemon to run now.
682 run_mhd_now (struct MhdHttpList *hd);
686 * Clean up s5r handles.
688 * @param s5r the handle to destroy
691 cleanup_s5r (struct Socks5Request *s5r)
693 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
694 "Cleaning up socks request\n");
695 if (NULL != s5r->curl)
697 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
698 "Cleaning up cURL handle\n");
699 curl_multi_remove_handle (curl_multi, s5r->curl);
700 curl_easy_cleanup (s5r->curl);
703 curl_slist_free_all (s5r->headers);
704 if ( (NULL != s5r->response) &&
705 (curl_failure_response != s5r->response) )
706 MHD_destroy_response (s5r->response);
707 if (GNUNET_SCHEDULER_NO_TASK != s5r->rtask)
708 GNUNET_SCHEDULER_cancel (s5r->rtask);
709 if (GNUNET_SCHEDULER_NO_TASK != s5r->timeout_task)
710 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
711 if (GNUNET_SCHEDULER_NO_TASK != s5r->wtask)
712 GNUNET_SCHEDULER_cancel (s5r->wtask);
713 if (NULL != s5r->gns_lookup)
714 GNUNET_GNS_lookup_cancel (s5r->gns_lookup);
715 if (NULL != s5r->sock)
717 if (SOCKS5_SOCKET_WITH_MHD <= s5r->state)
718 GNUNET_NETWORK_socket_free_memory_only_ (s5r->sock);
720 GNUNET_NETWORK_socket_close (s5r->sock);
722 GNUNET_CONTAINER_DLL_remove (s5r_head,
725 GNUNET_free_non_null (s5r->domain);
726 GNUNET_free_non_null (s5r->leho);
727 GNUNET_free_non_null (s5r->url);
732 /* ************************* HTTP handling with cURL *********************** */
736 * Callback for MHD response generation. This function is called from
737 * MHD whenever MHD expects to get data back. Copies data from the
738 * io_buf, if available.
740 * @param cls closure with our `struct Socks5Request`
741 * @param pos in buffer
742 * @param buf where to copy data
743 * @param max available space in @a buf
744 * @return number of bytes written to @a buf
747 mhd_content_cb (void *cls,
752 struct Socks5Request *s5r = cls;
753 size_t bytes_to_copy;
755 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
756 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
758 /* we're still not done with the upload, do not yet
759 start the download, the IO buffer is still full
761 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
762 "Pausing MHD download, not yet ready for download\n");
763 return 0; /* not yet ready for data download */
765 bytes_to_copy = GNUNET_MIN (max,
767 if ( (0 == bytes_to_copy) &&
768 (SOCKS5_SOCKET_DOWNLOAD_DONE != s5r->state) )
770 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
771 "Pausing MHD download, no data available\n");
772 return 0; /* more data later */
774 if ( (0 == bytes_to_copy) &&
775 (SOCKS5_SOCKET_DOWNLOAD_DONE == s5r->state) )
777 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
778 "Completed MHD download\n");
779 return MHD_CONTENT_READER_END_OF_STREAM;
781 memcpy (buf, s5r->io_buf, bytes_to_copy);
782 memmove (s5r->io_buf,
783 &s5r->io_buf[bytes_to_copy],
784 s5r->io_len - bytes_to_copy);
785 s5r->io_len -= bytes_to_copy;
786 if (NULL != s5r->curl)
787 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
788 return bytes_to_copy;
793 * Check that the website has presented us with a valid SSL certificate.
794 * The certificate must either match the domain name or the LEHO name
795 * (or, if available, the TLSA record).
797 * @param s5r request to check for.
798 * @return #GNUNET_OK if the certificate is valid
801 check_ssl_certificate (struct Socks5Request *s5r)
803 struct curl_tlsinfo tlsinfo;
804 unsigned int cert_list_size;
805 const gnutls_datum_t *chainp;
807 struct curl_tlsinfo *tlsinfo;
808 struct curl_slist *to_slist;
810 char certdn[GNUNET_DNSPARSER_MAX_NAME_LENGTH + 3];
812 gnutls_x509_crt x509_cert;
816 memset (&tlsinfo, 0, sizeof (tlsinfo));
817 gptr.tlsinfo = &tlsinfo;
819 curl_easy_getinfo (s5r->curl,
820 CURLINFO_TLS_SESSION,
822 return GNUNET_SYSERR;
823 if (CURLSSLBACKEND_GNUTLS != tlsinfo.ssl_backend)
825 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
826 _("Unsupported CURL SSL backend %d\n"),
827 tlsinfo.ssl_backend);
828 return GNUNET_SYSERR;
830 chainp = gnutls_certificate_get_peers (tlsinfo.internals, &cert_list_size);
831 if ( (! chainp) || (0 == cert_list_size) )
832 return GNUNET_SYSERR;
834 size = sizeof (certdn);
835 /* initialize an X.509 certificate structure. */
836 gnutls_x509_crt_init (&x509_cert);
837 gnutls_x509_crt_import (x509_cert,
839 GNUTLS_X509_FMT_DER);
841 if (0 != (rc = gnutls_x509_crt_get_dn_by_oid (x509_cert,
842 GNUTLS_OID_X520_COMMON_NAME,
843 0, /* the first and only one */
844 0 /* no DER encoding */,
848 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
849 "Failed to fetch CN from cert: %s\n",
850 gnutls_strerror(rc));
851 gnutls_x509_crt_deinit (x509_cert);
852 return GNUNET_SYSERR;
854 /* FIXME: here we should check for TLSA/DANE records */
857 if (NULL != s5r->leho)
861 if (0 == (rc = gnutls_x509_crt_check_hostname (x509_cert,
864 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
865 _("SSL certificate subject name (%s) does not match `%s'\n"),
868 gnutls_x509_crt_deinit (x509_cert);
869 return GNUNET_SYSERR;
874 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
875 _("No LEHO or domain name available and TLSA/DANE is not yet implemented!\n"));
876 return GNUNET_SYSERR;
878 gnutls_x509_crt_deinit (x509_cert);
883 for(i=0;i<cert_list_size;i++)
885 gnutls_x509_crt_t cert;
888 if (GNUTLS_E_SUCCESS == gnutls_x509_crt_init (&cert))
890 if (GNUTLS_E_SUCCESS ==
891 gnutls_x509_crt_import (cert, &chainp[i],
892 GNUTLS_X509_FMT_DER))
894 if (GNUTLS_E_SUCCESS ==
895 gnutls_x509_crt_print (cert,
896 GNUTLS_CRT_PRINT_FULL,
899 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
900 "Certificate #%d: %.*s", i, dn.size, dn.data);
901 gnutls_free (dn.data);
904 gnutls_x509_crt_deinit (cert);
914 * We're getting an HTTP response header from cURL. Convert it to the
915 * MHD response headers. Mostly copies the headers, but makes special
916 * adjustments to "Set-Cookie" and "Location" headers as those may need
917 * to be changed from the LEHO to the domain the browser expects.
919 * @param buffer curl buffer with a single line of header data; not 0-terminated!
920 * @param size curl blocksize
921 * @param nmemb curl blocknumber
922 * @param cls our `struct Socks5Request *`
923 * @return size of processed bytes
926 curl_check_hdr (void *buffer, size_t size, size_t nmemb, void *cls)
928 struct Socks5Request *s5r = cls;
929 size_t bytes = size * nmemb;
931 const char *hdr_type;
932 const char *cookie_domain;
935 char *new_cookie_hdr;
938 size_t delta_cdomain;
942 if (NULL == s5r->response)
944 /* first, check SSL certificate */
945 if ( (HTTPS_PORT == s5r->port) &&
946 (GNUNET_OK != check_ssl_certificate (s5r)) )
949 GNUNET_break (CURLE_OK ==
950 curl_easy_getinfo (s5r->curl,
951 CURLINFO_RESPONSE_CODE,
953 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
954 "Creating MHD response with code %d\n",
956 s5r->response_code = resp_code;
957 s5r->response = MHD_create_response_from_callback (MHD_SIZE_UNKNOWN,
962 if (NULL != s5r->leho)
966 GNUNET_asprintf (&cors_hdr,
967 (HTTPS_PORT == s5r->port)
972 GNUNET_break (MHD_YES ==
973 MHD_add_response_header (s5r->response,
974 MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN,
976 GNUNET_free (cors_hdr);
978 /* force connection to be closed after each request, as we
979 do not support HTTP pipelining */
980 GNUNET_break (MHD_YES ==
981 MHD_add_response_header (s5r->response,
982 MHD_HTTP_HEADER_CONNECTION,
986 ndup = GNUNET_strndup (buffer, bytes);
987 hdr_type = strtok (ndup, ":");
988 if (NULL == hdr_type)
993 hdr_val = strtok (NULL, "");
1002 /* custom logic for certain header types */
1003 new_cookie_hdr = NULL;
1004 if ( (NULL != s5r->leho) &&
1005 (0 == strcasecmp (hdr_type,
1006 MHD_HTTP_HEADER_SET_COOKIE)) )
1009 new_cookie_hdr = GNUNET_malloc (strlen (hdr_val) +
1010 strlen (s5r->domain) + 1);
1012 domain_matched = GNUNET_NO; /* make sure we match domain at most once */
1013 for (tok = strtok (hdr_val, ";"); NULL != tok; tok = strtok (NULL, ";"))
1015 if ( (0 == strncasecmp (tok, " domain", strlen (" domain"))) &&
1016 (GNUNET_NO == domain_matched) )
1018 domain_matched = GNUNET_YES;
1019 cookie_domain = tok + strlen (" domain") + 1;
1020 if (strlen (cookie_domain) < strlen (s5r->leho))
1022 delta_cdomain = strlen (s5r->leho) - strlen (cookie_domain);
1023 if (0 == strcasecmp (cookie_domain, s5r->leho + delta_cdomain))
1025 offset += sprintf (new_cookie_hdr + offset,
1031 else if (0 == strcmp (cookie_domain, s5r->leho))
1033 offset += sprintf (new_cookie_hdr + offset,
1038 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1039 _("Cookie domain `%s' supplied by server is invalid\n"),
1042 memcpy (new_cookie_hdr + offset, tok, strlen (tok));
1043 offset += strlen (tok);
1044 new_cookie_hdr[offset++] = ';';
1046 hdr_val = new_cookie_hdr;
1049 new_location = NULL;
1050 if (0 == strcasecmp (MHD_HTTP_HEADER_LOCATION, hdr_type))
1054 GNUNET_asprintf (&leho_host,
1055 (HTTPS_PORT != s5r->port)
1059 if (0 == strncmp (leho_host,
1061 strlen (leho_host)))
1063 GNUNET_asprintf (&new_location,
1065 (HTTPS_PORT != s5r->port)
1069 hdr_val + strlen (leho_host));
1070 hdr_val = new_location;
1072 GNUNET_free (leho_host);
1074 /* MHD does not allow certain characters in values, remove those */
1075 if (NULL != (tok = strchr (hdr_val, '\n')))
1077 if (NULL != (tok = strchr (hdr_val, '\r')))
1079 if (NULL != (tok = strchr (hdr_val, '\t')))
1081 if (0 != strlen (hdr_val))
1083 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1084 "Adding header %s: %s to MHD response\n",
1087 GNUNET_break (MHD_YES ==
1088 MHD_add_response_header (s5r->response,
1093 GNUNET_free_non_null (new_cookie_hdr);
1094 GNUNET_free_non_null (new_location);
1100 * Handle response payload data from cURL. Copies it into our `io_buf` to make
1101 * it available to MHD.
1103 * @param ptr pointer to the data
1104 * @param size number of blocks of data
1105 * @param nmemb blocksize
1106 * @param ctx our `struct Socks5Request *`
1107 * @return number of bytes handled
1110 curl_download_cb (void *ptr, size_t size, size_t nmemb, void* ctx)
1112 struct Socks5Request *s5r = ctx;
1113 size_t total = size * nmemb;
1115 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
1116 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1118 /* we're still not done with the upload, do not yet
1119 start the download, the IO buffer is still full
1120 with upload data. */
1121 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1122 "Pausing CURL download, waiting for UPLOAD to finish\n");
1123 return CURL_WRITEFUNC_PAUSE; /* not yet ready for data download */
1125 if (sizeof (s5r->io_buf) - s5r->io_len < total)
1127 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1128 "Pausing CURL download, not enough space\n");
1129 return CURL_WRITEFUNC_PAUSE; /* not enough space */
1131 memcpy (&s5r->io_buf[s5r->io_len],
1134 s5r->io_len += total;
1135 if (s5r->io_len == total)
1136 run_mhd_now (s5r->hd);
1142 * cURL callback for uploaded (PUT/POST) data. Copies it into our `io_buf`
1143 * to make it available to MHD.
1145 * @param buf where to write the data
1146 * @param size number of bytes per member
1147 * @param nmemb number of members available in @a buf
1148 * @param cls our `struct Socks5Request` that generated the data
1149 * @return number of bytes copied to @a buf
1152 curl_upload_cb (void *buf, size_t size, size_t nmemb, void *cls)
1154 struct Socks5Request *s5r = cls;
1155 size_t len = size * nmemb;
1158 if ( (0 == s5r->io_len) &&
1159 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1161 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1162 "Pausing CURL UPLOAD, need more data\n");
1163 return CURL_READFUNC_PAUSE;
1165 if ( (0 == s5r->io_len) &&
1166 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1168 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1169 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1170 "Completed CURL UPLOAD\n");
1171 return 0; /* upload finished, can now download */
1173 if ( (SOCKS5_SOCKET_UPLOAD_STARTED != s5r->state) ||
1174 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1177 return CURL_READFUNC_ABORT;
1179 to_copy = GNUNET_MIN (s5r->io_len,
1181 memcpy (buf, s5r->io_buf, to_copy);
1182 memmove (s5r->io_buf,
1183 &s5r->io_buf[to_copy],
1184 s5r->io_len - to_copy);
1185 s5r->io_len -= to_copy;
1186 if (s5r->io_len + to_copy == sizeof (s5r->io_buf))
1187 run_mhd_now (s5r->hd); /* got more space for upload now */
1192 /* ************************** main loop of cURL interaction ****************** */
1196 * Task that is run when we are ready to receive more data
1199 * @param cls closure
1200 * @param tc task context
1203 curl_task_download (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
1207 * Ask cURL for the select() sets and schedule cURL operations.
1210 curl_download_prepare ()
1217 struct GNUNET_NETWORK_FDSet *grs;
1218 struct GNUNET_NETWORK_FDSet *gws;
1220 struct GNUNET_TIME_Relative rtime;
1222 if (GNUNET_SCHEDULER_NO_TASK != curl_download_task)
1224 GNUNET_SCHEDULER_cancel (curl_download_task);
1225 curl_download_task = GNUNET_SCHEDULER_NO_TASK;
1231 if (CURLM_OK != (mret = curl_multi_fdset (curl_multi, &rs, &ws, &es, &max)))
1233 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1234 "%s failed at %s:%d: `%s'\n",
1235 "curl_multi_fdset", __FILE__, __LINE__,
1236 curl_multi_strerror (mret));
1240 GNUNET_break (CURLM_OK == curl_multi_timeout (curl_multi, &to));
1242 rtime = GNUNET_TIME_UNIT_FOREVER_REL;
1244 rtime = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, to);
1247 grs = GNUNET_NETWORK_fdset_create ();
1248 gws = GNUNET_NETWORK_fdset_create ();
1249 GNUNET_NETWORK_fdset_copy_native (grs, &rs, max + 1);
1250 GNUNET_NETWORK_fdset_copy_native (gws, &ws, max + 1);
1251 curl_download_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1254 &curl_task_download, curl_multi);
1255 GNUNET_NETWORK_fdset_destroy (gws);
1256 GNUNET_NETWORK_fdset_destroy (grs);
1260 curl_download_task = GNUNET_SCHEDULER_add_delayed (rtime,
1261 &curl_task_download,
1268 * Task that is run when we are ready to receive more data from curl.
1270 * @param cls closure, NULL
1271 * @param tc task context
1274 curl_task_download (void *cls,
1275 const struct GNUNET_SCHEDULER_TaskContext *tc)
1279 struct CURLMsg *msg;
1281 struct Socks5Request *s5r;
1283 curl_download_task = GNUNET_SCHEDULER_NO_TASK;
1287 mret = curl_multi_perform (curl_multi, &running);
1288 while (NULL != (msg = curl_multi_info_read (curl_multi, &msgnum)))
1290 GNUNET_break (CURLE_OK ==
1291 curl_easy_getinfo (msg->easy_handle,
1302 /* documentation says this is not used */
1306 switch (msg->data.result)
1309 case CURLE_GOT_NOTHING:
1310 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1311 "CURL download completed.\n");
1312 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1313 run_mhd_now (s5r->hd);
1316 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1317 "Download curl failed: %s\n",
1318 curl_easy_strerror (msg->data.result));
1319 /* FIXME: indicate error somehow? close MHD connection badly as well? */
1320 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1321 run_mhd_now (s5r->hd);
1324 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1325 "Cleaning up cURL handle\n");
1326 curl_multi_remove_handle (curl_multi, s5r->curl);
1327 curl_easy_cleanup (s5r->curl);
1329 if (NULL == s5r->response)
1330 s5r->response = curl_failure_response;
1333 /* documentation says this is not used */
1337 /* unexpected status code */
1342 } while (mret == CURLM_CALL_MULTI_PERFORM);
1343 if (CURLM_OK != mret)
1344 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1345 "%s failed at %s:%d: `%s'\n",
1346 "curl_multi_perform", __FILE__, __LINE__,
1347 curl_multi_strerror (mret));
1350 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1351 "Suspending cURL multi loop, no more events pending\n");
1352 return; /* nothing more in progress */
1354 curl_download_prepare ();
1358 /* ********************************* MHD response generation ******************* */
1362 * Read HTTP request header field from the request. Copies the fields
1363 * over to the 'headers' that will be given to curl. However, 'Host'
1364 * is substituted with the LEHO if present. We also change the
1365 * 'Connection' header value to "close" as the proxy does not support
1368 * @param cls our `struct Socks5Request`
1369 * @param kind value kind
1370 * @param key field key
1371 * @param value field value
1372 * @return MHD_YES to continue to iterate
1375 con_val_iter (void *cls,
1376 enum MHD_ValueKind kind,
1380 struct Socks5Request *s5r = cls;
1383 if ( (0 == strcasecmp (MHD_HTTP_HEADER_HOST, key)) &&
1384 (NULL != s5r->leho) )
1386 if (0 == strcasecmp (MHD_HTTP_HEADER_CONNECTION, key))
1388 GNUNET_asprintf (&hdr,
1392 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1393 "Adding HEADER `%s' to HTTP request\n",
1395 s5r->headers = curl_slist_append (s5r->headers,
1403 * Main MHD callback for handling requests.
1406 * @param con MHD connection handle
1407 * @param url the url in the request
1408 * @param meth the HTTP method used ("GET", "PUT", etc.)
1409 * @param ver the HTTP version string (i.e. "HTTP/1.1")
1410 * @param upload_data the data being uploaded (excluding HEADERS,
1411 * for a POST that fits into memory and that is encoded
1412 * with a supported encoding, the POST data will NOT be
1413 * given in upload_data and is instead available as
1414 * part of MHD_get_connection_values; very large POST
1415 * data *will* be made available incrementally in
1417 * @param upload_data_size set initially to the size of the
1418 * @a upload_data provided; the method must update this
1419 * value to the number of bytes NOT processed;
1420 * @param con_cls pointer to location where we store the 'struct Request'
1421 * @return MHD_YES if the connection was handled successfully,
1422 * MHD_NO if the socket must be closed due to a serious
1423 * error while handling the request
1426 create_response (void *cls,
1427 struct MHD_Connection *con,
1431 const char *upload_data,
1432 size_t *upload_data_size,
1435 /* struct MhdHttpList* hd = cls; */
1436 struct Socks5Request *s5r = *con_cls;
1438 char ipstring[INET6_ADDRSTRLEN];
1439 char ipaddr[INET6_ADDRSTRLEN + 2];
1440 const struct sockaddr *sa;
1441 const struct sockaddr_in *s4;
1442 const struct sockaddr_in6 *s6;
1451 if ( (NULL == s5r->curl) &&
1452 (SOCKS5_SOCKET_WITH_MHD == s5r->state) )
1454 /* first time here, initialize curl handle */
1455 sa = (const struct sockaddr *) &s5r->destination_address;
1456 switch (sa->sa_family)
1459 s4 = (const struct sockaddr_in *) &s5r->destination_address;
1460 if (NULL == inet_ntop (AF_INET,
1468 GNUNET_snprintf (ipaddr,
1472 port = ntohs (s4->sin_port);
1475 s6 = (const struct sockaddr_in6 *) &s5r->destination_address;
1476 if (NULL == inet_ntop (AF_INET6,
1484 GNUNET_snprintf (ipaddr,
1488 port = ntohs (s6->sin6_port);
1494 s5r->curl = curl_easy_init ();
1495 if (NULL == s5r->curl)
1496 return MHD_queue_response (con,
1497 MHD_HTTP_INTERNAL_SERVER_ERROR,
1498 curl_failure_response);
1499 curl_easy_setopt (s5r->curl, CURLOPT_HEADERFUNCTION, &curl_check_hdr);
1500 curl_easy_setopt (s5r->curl, CURLOPT_HEADERDATA, s5r);
1501 curl_easy_setopt (s5r->curl, CURLOPT_FOLLOWLOCATION, 0);
1502 curl_easy_setopt (s5r->curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
1503 curl_easy_setopt (s5r->curl, CURLOPT_CONNECTTIMEOUT, 600L);
1504 curl_easy_setopt (s5r->curl, CURLOPT_TIMEOUT, 600L);
1505 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1506 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_CONTENT_DECODING, 0);
1507 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_TRANSFER_DECODING, 0);
1508 curl_easy_setopt (s5r->curl, CURLOPT_NOSIGNAL, 1L);
1509 curl_easy_setopt (s5r->curl, CURLOPT_PRIVATE, s5r);
1510 curl_easy_setopt (s5r->curl, CURLOPT_VERBOSE, 0);
1511 GNUNET_asprintf (&curlurl,
1512 (HTTPS_PORT != s5r->port)
1514 : "https://%s:%d%s",
1518 curl_easy_setopt (s5r->curl,
1521 GNUNET_free (curlurl);
1523 if (0 == strcasecmp (meth, MHD_HTTP_METHOD_PUT))
1525 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1526 curl_easy_setopt (s5r->curl, CURLOPT_UPLOAD, 1);
1527 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1528 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1529 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1530 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1532 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_POST))
1534 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1535 curl_easy_setopt (s5r->curl, CURLOPT_POST, 1);
1536 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1537 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1538 curl_easy_setopt (s5r->curl, CURLOPT_READFUNCTION, &curl_upload_cb);
1539 curl_easy_setopt (s5r->curl, CURLOPT_READDATA, s5r);
1541 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_HEAD))
1543 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1544 curl_easy_setopt (s5r->curl, CURLOPT_NOBODY, 1);
1546 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_GET))
1548 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1549 curl_easy_setopt (s5r->curl, CURLOPT_HTTPGET, 1);
1550 curl_easy_setopt (s5r->curl, CURLOPT_WRITEFUNCTION, &curl_download_cb);
1551 curl_easy_setopt (s5r->curl, CURLOPT_WRITEDATA, s5r);
1555 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1556 _("Unsupported HTTP method `%s'\n"),
1558 curl_easy_cleanup (s5r->curl);
1563 if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_0))
1565 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
1567 else if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_1))
1569 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
1573 curl_easy_setopt (s5r->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_NONE);
1576 if (HTTPS_PORT == s5r->port)
1578 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);
1579 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYPEER, 1L);
1580 /* Disable cURL checking the hostname, as we will check ourselves
1581 as only we have the domain name or the LEHO or the DANE record */
1582 curl_easy_setopt (s5r->curl, CURLOPT_SSL_VERIFYHOST, 0L);
1586 curl_easy_setopt (s5r->curl, CURLOPT_USE_SSL, CURLUSESSL_NONE);
1589 if (CURLM_OK != curl_multi_add_handle (curl_multi, s5r->curl))
1592 curl_easy_cleanup (s5r->curl);
1596 MHD_get_connection_values (con,
1598 &con_val_iter, s5r);
1599 curl_easy_setopt (s5r->curl, CURLOPT_HTTPHEADER, s5r->headers);
1600 curl_download_prepare ();
1604 /* continuing to process request */
1605 if (0 != *upload_data_size)
1607 left = GNUNET_MIN (*upload_data_size,
1608 sizeof (s5r->io_buf) - s5r->io_len);
1609 memcpy (&s5r->io_buf[s5r->io_len],
1612 s5r->io_len += left;
1613 *upload_data_size -= left;
1614 GNUNET_assert (NULL != s5r->curl);
1615 curl_easy_pause (s5r->curl, CURLPAUSE_CONT);
1616 curl_download_prepare ();
1619 if (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state)
1621 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1622 "Finished processing UPLOAD\n");
1623 s5r->state = SOCKS5_SOCKET_UPLOAD_DONE;
1625 if (NULL == s5r->response)
1626 return MHD_YES; /* too early to queue response, did not yet get headers from cURL */
1627 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1628 "Queueing response with MHD\n");
1629 return MHD_queue_response (con,
1635 /* ******************** MHD HTTP setup and event loop ******************** */
1639 * Function called when MHD decides that we are done with a connection.
1642 * @param connection connection handle
1643 * @param con_cls value as set by the last call to
1644 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request`
1645 * @param toe reason for request termination (ignored)
1648 mhd_completed_cb (void *cls,
1649 struct MHD_Connection *connection,
1651 enum MHD_RequestTerminationCode toe)
1653 struct Socks5Request *s5r = *con_cls;
1657 if (MHD_REQUEST_TERMINATED_COMPLETED_OK != toe)
1658 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1659 "MHD encountered error handling request: %d\n",
1667 * Function called when MHD first processes an incoming connection.
1668 * Gives us the respective URI information.
1670 * We use this to associate the `struct MHD_Connection` with our
1671 * internal `struct Socks5Request` data structure (by checking
1672 * for matching sockets).
1674 * @param cls the HTTP server handle (a `struct MhdHttpList`)
1675 * @param url the URL that is being requested
1676 * @param connection MHD connection object for the request
1677 * @return the `struct Socks5Request` that this @a connection is for
1680 mhd_log_callback (void *cls,
1682 struct MHD_Connection *connection)
1684 struct Socks5Request *s5r;
1685 const union MHD_ConnectionInfo *ci;
1688 ci = MHD_get_connection_info (connection,
1689 MHD_CONNECTION_INFO_CONNECTION_FD);
1695 sock = ci->connect_fd;
1696 for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
1698 if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
1700 if (NULL != s5r->url)
1705 s5r->url = GNUNET_strdup (url);
1706 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
1707 s5r->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1716 * Kill the given MHD daemon.
1718 * @param hd daemon to stop
1721 kill_httpd (struct MhdHttpList *hd)
1723 GNUNET_CONTAINER_DLL_remove (mhd_httpd_head,
1726 GNUNET_free_non_null (hd->domain);
1727 MHD_stop_daemon (hd->daemon);
1728 if (GNUNET_SCHEDULER_NO_TASK != hd->httpd_task)
1730 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1731 hd->httpd_task = GNUNET_SCHEDULER_NO_TASK;
1733 GNUNET_free_non_null (hd->proxy_cert);
1741 * Task run whenever HTTP server is idle for too long. Kill it.
1743 * @param cls the `struct MhdHttpList *`
1744 * @param tc sched context
1747 kill_httpd_task (void *cls,
1748 const struct GNUNET_SCHEDULER_TaskContext *tc)
1750 struct MhdHttpList *hd = cls;
1752 hd->httpd_task = GNUNET_SCHEDULER_NO_TASK;
1758 * Task run whenever HTTP server operations are pending.
1760 * @param cls the `struct MhdHttpList *` of the daemon that is being run
1761 * @param tc sched context
1764 do_httpd (void *cls,
1765 const struct GNUNET_SCHEDULER_TaskContext *tc);
1769 * Schedule MHD. This function should be called initially when an
1770 * MHD is first getting its client socket, and will then automatically
1771 * always be called later whenever there is work to be done.
1773 * @param hd the daemon to schedule
1776 schedule_httpd (struct MhdHttpList *hd)
1781 struct GNUNET_NETWORK_FDSet *wrs;
1782 struct GNUNET_NETWORK_FDSet *wws;
1785 MHD_UNSIGNED_LONG_LONG timeout;
1786 struct GNUNET_TIME_Relative tv;
1792 if (MHD_YES != MHD_get_fdset (hd->daemon, &rs, &ws, &es, &max))
1797 haveto = MHD_get_timeout (hd->daemon, &timeout);
1798 if (MHD_YES == haveto)
1799 tv.rel_value_us = (uint64_t) timeout * 1000LL;
1801 tv = GNUNET_TIME_UNIT_FOREVER_REL;
1804 wrs = GNUNET_NETWORK_fdset_create ();
1805 wws = GNUNET_NETWORK_fdset_create ();
1806 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
1807 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
1814 if (GNUNET_SCHEDULER_NO_TASK != hd->httpd_task)
1815 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1816 if ( (MHD_YES != haveto) &&
1820 /* daemon is idle, kill after timeout */
1821 hd->httpd_task = GNUNET_SCHEDULER_add_delayed (MHD_CACHE_TIMEOUT,
1828 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1833 GNUNET_NETWORK_fdset_destroy (wrs);
1835 GNUNET_NETWORK_fdset_destroy (wws);
1840 * Task run whenever HTTP server operations are pending.
1842 * @param cls the `struct MhdHttpList` of the daemon that is being run
1843 * @param tc scheduler context
1846 do_httpd (void *cls,
1847 const struct GNUNET_SCHEDULER_TaskContext *tc)
1849 struct MhdHttpList *hd = cls;
1851 hd->httpd_task = GNUNET_SCHEDULER_NO_TASK;
1852 MHD_run (hd->daemon);
1853 schedule_httpd (hd);
1858 * Run MHD now, we have extra data ready for the callback.
1860 * @param hd the daemon to run now.
1863 run_mhd_now (struct MhdHttpList *hd)
1865 if (GNUNET_SCHEDULER_NO_TASK !=
1867 GNUNET_SCHEDULER_cancel (hd->httpd_task);
1868 hd->httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd,
1874 * Read file in filename
1876 * @param filename file to read
1877 * @param size pointer where filesize is stored
1878 * @return NULL on error
1881 load_file (const char* filename,
1888 GNUNET_DISK_file_size (filename, &fsize,
1889 GNUNET_YES, GNUNET_YES))
1891 if (fsize > MAX_PEM_SIZE)
1893 *size = (unsigned int) fsize;
1894 buffer = GNUNET_malloc (*size);
1895 if (fsize != GNUNET_DISK_fn_read (filename, buffer, (size_t) fsize))
1897 GNUNET_free (buffer);
1905 * Load PEM key from file
1907 * @param key where to store the data
1908 * @param keyfile path to the PEM file
1909 * @return #GNUNET_OK on success
1912 load_key_from_file (gnutls_x509_privkey_t key,
1913 const char* keyfile)
1915 gnutls_datum_t key_data;
1918 key_data.data = load_file (keyfile, &key_data.size);
1919 if (NULL == key_data.data)
1920 return GNUNET_SYSERR;
1921 ret = gnutls_x509_privkey_import (key, &key_data,
1922 GNUTLS_X509_FMT_PEM);
1923 if (GNUTLS_E_SUCCESS != ret)
1925 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1926 _("Unable to import private key from file `%s'\n"),
1929 GNUNET_free_non_null (key_data.data);
1930 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
1935 * Load cert from file
1937 * @param crt struct to store data in
1938 * @param certfile path to pem file
1939 * @return #GNUNET_OK on success
1942 load_cert_from_file (gnutls_x509_crt_t crt,
1943 const char* certfile)
1945 gnutls_datum_t cert_data;
1948 cert_data.data = load_file (certfile, &cert_data.size);
1949 if (NULL == cert_data.data)
1950 return GNUNET_SYSERR;
1951 ret = gnutls_x509_crt_import (crt, &cert_data,
1952 GNUTLS_X509_FMT_PEM);
1953 if (GNUTLS_E_SUCCESS != ret)
1955 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1956 _("Unable to import certificate %s\n"), certfile);
1958 GNUNET_free_non_null (cert_data.data);
1959 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
1964 * Generate new certificate for specific name
1966 * @param name the subject name to generate a cert for
1967 * @return a struct holding the PEM data, NULL on error
1969 static struct ProxyGNSCertificate *
1970 generate_gns_certificate (const char *name)
1972 unsigned int serial;
1973 size_t key_buf_size;
1974 size_t cert_buf_size;
1975 gnutls_x509_crt_t request;
1978 struct ProxyGNSCertificate *pgc;
1980 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1981 "Generating TLS/SSL certificate for `%s'\n",
1983 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_init (&request));
1984 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_key (request, proxy_ca.key));
1985 pgc = GNUNET_new (struct ProxyGNSCertificate);
1986 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COUNTRY_NAME,
1988 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_ORGANIZATION_NAME,
1989 0, "GNU Name System", 4);
1990 gnutls_x509_crt_set_dn_by_oid (request, GNUTLS_OID_X520_COMMON_NAME,
1991 0, name, strlen (name));
1992 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_version (request, 3));
1993 gnutls_rnd (GNUTLS_RND_NONCE, &serial, sizeof (serial));
1994 gnutls_x509_crt_set_serial (request,
1997 etime = time (NULL);
1998 tm_data = localtime (&etime);
1999 gnutls_x509_crt_set_activation_time (request,
2002 etime = mktime (tm_data);
2003 gnutls_x509_crt_set_expiration_time (request,
2005 gnutls_x509_crt_sign (request,
2008 key_buf_size = sizeof (pgc->key);
2009 cert_buf_size = sizeof (pgc->cert);
2010 gnutls_x509_crt_export (request, GNUTLS_X509_FMT_PEM,
2011 pgc->cert, &cert_buf_size);
2012 gnutls_x509_privkey_export (proxy_ca.key, GNUTLS_X509_FMT_PEM,
2013 pgc->key, &key_buf_size);
2014 gnutls_x509_crt_deinit (request);
2020 * Function called by MHD with errors, suppresses them all.
2022 * @param cls closure
2023 * @param fm format string (`printf()`-style)
2024 * @param ap arguments to @a fm
2027 mhd_error_log_callback (void *cls,
2036 * Lookup (or create) an SSL MHD instance for a particular domain.
2038 * @param domain the domain the SSL daemon has to serve
2039 * @return NULL on errro
2041 static struct MhdHttpList *
2042 lookup_ssl_httpd (const char* domain)
2044 struct MhdHttpList *hd;
2045 struct ProxyGNSCertificate *pgc;
2047 for (hd = mhd_httpd_head; NULL != hd; hd = hd->next)
2048 if ( (NULL != hd->domain) &&
2049 (0 == strcmp (hd->domain, domain)) )
2051 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2052 "Starting fresh MHD HTTPS instance for domain `%s'\n",
2054 pgc = generate_gns_certificate (domain);
2055 hd = GNUNET_new (struct MhdHttpList);
2056 hd->is_ssl = GNUNET_YES;
2057 hd->domain = GNUNET_strdup (domain);
2058 hd->proxy_cert = pgc;
2059 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_SSL | MHD_USE_NO_LISTEN_SOCKET,
2062 &create_response, hd,
2063 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
2064 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
2065 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
2066 MHD_OPTION_EXTERNAL_LOGGER, &mhd_error_log_callback, NULL,
2067 MHD_OPTION_HTTPS_MEM_KEY, pgc->key,
2068 MHD_OPTION_HTTPS_MEM_CERT, pgc->cert,
2070 if (NULL == hd->daemon)
2076 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
2084 * Task run when a Socks5Request somehow fails to be associated with
2085 * an MHD connection (i.e. because the client never speaks HTTP after
2086 * the SOCKS5 handshake). Clean up.
2088 * @param cls the `struct Socks5Request *`
2089 * @param tc sched context
2092 timeout_s5r_handshake (void *cls,
2093 const struct GNUNET_SCHEDULER_TaskContext *tc)
2095 struct Socks5Request *s5r = cls;
2097 s5r->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2103 * We're done with the Socks5 protocol, now we need to pass the
2104 * connection data through to the final destination, either
2105 * direct (if the protocol might not be HTTP), or via MHD
2106 * (if the port looks like it should be HTTP).
2108 * @param s5r socks request that has reached the final stage
2111 setup_data_transfer (struct Socks5Request *s5r)
2113 struct MhdHttpList *hd;
2115 const struct sockaddr *addr;
2121 hd = lookup_ssl_httpd (s5r->domain);
2124 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2125 _("Failed to start HTTPS server for `%s'\n"),
2133 GNUNET_assert (NULL != httpd);
2137 fd = GNUNET_NETWORK_get_fd (s5r->sock);
2138 addr = GNUNET_NETWORK_get_addr (s5r->sock);
2139 len = GNUNET_NETWORK_get_addrlen (s5r->sock);
2140 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2141 if (MHD_YES != MHD_add_connection (hd->daemon, fd, addr, len))
2143 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2144 _("Failed to pass client to MHD\n"));
2149 schedule_httpd (hd);
2150 s5r->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_HANDSHAKE_TIMEOUT,
2151 &timeout_s5r_handshake,
2156 /* ********************* SOCKS handling ************************* */
2160 * Write data from buffer to socks5 client, then continue with state machine.
2162 * @param cls the closure with the `struct Socks5Request`
2163 * @param tc scheduler context
2166 do_write (void *cls,
2167 const struct GNUNET_SCHEDULER_TaskContext *tc)
2169 struct Socks5Request *s5r = cls;
2172 s5r->wtask = GNUNET_SCHEDULER_NO_TASK;
2173 len = GNUNET_NETWORK_socket_send (s5r->sock,
2178 /* write error: connection closed, shutdown, etc.; just clean up */
2184 s5r->wbuf_len - len);
2185 s5r->wbuf_len -= len;
2186 if (s5r->wbuf_len > 0)
2188 /* not done writing */
2190 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2196 /* we're done writing, continue with state machine! */
2203 case SOCKS5_REQUEST:
2204 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != s5r->rtask);
2206 case SOCKS5_DATA_TRANSFER:
2207 setup_data_transfer (s5r);
2209 case SOCKS5_WRITE_THEN_CLEANUP:
2220 * Return a server response message indicating a failure to the client.
2222 * @param s5r request to return failure code for
2223 * @param sc status code to return
2226 signal_socks_failure (struct Socks5Request *s5r,
2227 enum Socks5StatusCode sc)
2229 struct Socks5ServerResponseMessage *s_resp;
2231 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2232 memset (s_resp, 0, sizeof (struct Socks5ServerResponseMessage));
2233 s_resp->version = SOCKS_VERSION_5;
2235 s5r->state = SOCKS5_WRITE_THEN_CLEANUP;
2236 if (GNUNET_SCHEDULER_NO_TASK != s5r->wtask)
2238 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2245 * Return a server response message indicating success.
2247 * @param s5r request to return success status message for
2250 signal_socks_success (struct Socks5Request *s5r)
2252 struct Socks5ServerResponseMessage *s_resp;
2254 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2255 s_resp->version = SOCKS_VERSION_5;
2256 s_resp->reply = SOCKS5_STATUS_REQUEST_GRANTED;
2257 s_resp->reserved = 0;
2258 s_resp->addr_type = SOCKS5_AT_IPV4;
2259 /* zero out IPv4 address and port */
2262 sizeof (struct in_addr) + sizeof (uint16_t));
2263 s5r->wbuf_len += sizeof (struct Socks5ServerResponseMessage) +
2264 sizeof (struct in_addr) + sizeof (uint16_t);
2265 if (GNUNET_SCHEDULER_NO_TASK == s5r->wtask)
2267 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2274 * Process GNS results for target domain.
2276 * @param cls the `struct Socks5Request`
2277 * @param rd_count number of records returned
2278 * @param rd record data
2281 handle_gns_result (void *cls,
2283 const struct GNUNET_GNSRECORD_Data *rd)
2285 struct Socks5Request *s5r = cls;
2287 const struct GNUNET_GNSRECORD_Data *r;
2290 s5r->gns_lookup = NULL;
2292 for (i=0;i<rd_count;i++)
2295 switch (r->record_type)
2297 case GNUNET_DNSPARSER_TYPE_A:
2299 struct sockaddr_in *in;
2301 if (sizeof (struct in_addr) != r->data_size)
2303 GNUNET_break_op (0);
2306 if (GNUNET_YES == got_ip)
2309 GNUNET_NETWORK_test_pf (PF_INET))
2311 got_ip = GNUNET_YES;
2312 in = (struct sockaddr_in *) &s5r->destination_address;
2313 in->sin_family = AF_INET;
2314 memcpy (&in->sin_addr,
2317 in->sin_port = htons (s5r->port);
2318 #if HAVE_SOCKADDR_IN_SIN_LEN
2319 in->sin_len = sizeof (*in);
2323 case GNUNET_DNSPARSER_TYPE_AAAA:
2325 struct sockaddr_in6 *in;
2327 if (sizeof (struct in6_addr) != r->data_size)
2329 GNUNET_break_op (0);
2332 if (GNUNET_YES == got_ip)
2335 GNUNET_NETWORK_test_pf (PF_INET))
2337 /* FIXME: allow user to disable IPv6 per configuration option... */
2338 got_ip = GNUNET_YES;
2339 in = (struct sockaddr_in6 *) &s5r->destination_address;
2340 in->sin6_family = AF_INET6;
2341 memcpy (&in->sin6_addr,
2344 in->sin6_port = htons (s5r->port);
2345 #if HAVE_SOCKADDR_IN_SIN_LEN
2346 in->sin6_len = sizeof (*in);
2350 case GNUNET_GNSRECORD_TYPE_VPN:
2351 GNUNET_break (0); /* should have been translated within GNS */
2353 case GNUNET_GNSRECORD_TYPE_LEHO:
2354 GNUNET_free_non_null (s5r->leho);
2355 s5r->leho = GNUNET_strndup (r->data,
2363 if (GNUNET_YES != got_ip)
2365 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2366 "Name resolution failed to yield useful IP address.\n");
2367 signal_socks_failure (s5r,
2368 SOCKS5_STATUS_GENERAL_FAILURE);
2371 s5r->state = SOCKS5_DATA_TRANSFER;
2372 signal_socks_success (s5r);
2377 * Remove the first @a len bytes from the beginning of the read buffer.
2379 * @param s5r the handle clear the read buffer for
2380 * @param len number of bytes in read buffer to advance
2383 clear_from_s5r_rbuf (struct Socks5Request *s5r,
2386 GNUNET_assert (len <= s5r->rbuf_len);
2389 s5r->rbuf_len - len);
2390 s5r->rbuf_len -= len;
2395 * Read data from incoming Socks5 connection
2397 * @param cls the closure with the `struct Socks5Request`
2398 * @param tc the scheduler context
2401 do_s5r_read (void *cls,
2402 const struct GNUNET_SCHEDULER_TaskContext *tc)
2404 struct Socks5Request *s5r = cls;
2405 const struct Socks5ClientHelloMessage *c_hello;
2406 struct Socks5ServerHelloMessage *s_hello;
2407 const struct Socks5ClientRequestMessage *c_req;
2411 s5r->rtask = GNUNET_SCHEDULER_NO_TASK;
2412 if ( (NULL != tc->read_ready) &&
2413 (GNUNET_NETWORK_fdset_isset (tc->read_ready, s5r->sock)) )
2415 rlen = GNUNET_NETWORK_socket_recv (s5r->sock,
2416 &s5r->rbuf[s5r->rbuf_len],
2417 sizeof (s5r->rbuf) - s5r->rbuf_len);
2420 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2421 "socks5 client disconnected.\n");
2425 s5r->rbuf_len += rlen;
2427 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2430 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2431 "Processing %u bytes of socks data in state %d\n",
2437 c_hello = (const struct Socks5ClientHelloMessage*) &s5r->rbuf;
2438 if ( (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage)) ||
2439 (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods) )
2440 return; /* need more data */
2441 if (SOCKS_VERSION_5 != c_hello->version)
2443 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2444 _("Unsupported socks version %d\n"),
2445 (int) c_hello->version);
2449 clear_from_s5r_rbuf (s5r,
2450 sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods);
2451 GNUNET_assert (0 == s5r->wbuf_len);
2452 s_hello = (struct Socks5ServerHelloMessage *) &s5r->wbuf;
2453 s5r->wbuf_len = sizeof (struct Socks5ServerHelloMessage);
2454 s_hello->version = SOCKS_VERSION_5;
2455 s_hello->auth_method = SOCKS_AUTH_NONE;
2456 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == s5r->wtask);
2457 s5r->wtask = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2460 s5r->state = SOCKS5_REQUEST;
2462 case SOCKS5_REQUEST:
2463 c_req = (const struct Socks5ClientRequestMessage *) &s5r->rbuf;
2464 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage))
2466 switch (c_req->command)
2468 case SOCKS5_CMD_TCP_STREAM:
2472 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2473 _("Unsupported socks command %d\n"),
2474 (int) c_req->command);
2475 signal_socks_failure (s5r,
2476 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED);
2479 switch (c_req->addr_type)
2481 case SOCKS5_AT_IPV4:
2483 const struct in_addr *v4 = (const struct in_addr *) &c_req[1];
2484 const uint16_t *port = (const uint16_t *) &v4[1];
2485 struct sockaddr_in *in;
2487 s5r->port = ntohs (*port);
2488 alen = sizeof (struct in_addr);
2489 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2490 alen + sizeof (uint16_t))
2491 return; /* need more data */
2492 in = (struct sockaddr_in *) &s5r->destination_address;
2493 in->sin_family = AF_INET;
2495 in->sin_port = *port;
2496 #if HAVE_SOCKADDR_IN_SIN_LEN
2497 in->sin_len = sizeof (*in);
2499 s5r->state = SOCKS5_DATA_TRANSFER;
2502 case SOCKS5_AT_IPV6:
2504 const struct in6_addr *v6 = (const struct in6_addr *) &c_req[1];
2505 const uint16_t *port = (const uint16_t *) &v6[1];
2506 struct sockaddr_in6 *in;
2508 s5r->port = ntohs (*port);
2509 alen = sizeof (struct in6_addr);
2510 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2511 alen + sizeof (uint16_t))
2512 return; /* need more data */
2513 in = (struct sockaddr_in6 *) &s5r->destination_address;
2514 in->sin6_family = AF_INET6;
2515 in->sin6_addr = *v6;
2516 in->sin6_port = *port;
2517 #if HAVE_SOCKADDR_IN_SIN_LEN
2518 in->sin6_len = sizeof (*in);
2520 s5r->state = SOCKS5_DATA_TRANSFER;
2523 case SOCKS5_AT_DOMAINNAME:
2525 const uint8_t *dom_len;
2526 const char *dom_name;
2527 const uint16_t *port;
2529 dom_len = (const uint8_t *) &c_req[1];
2530 alen = *dom_len + 1;
2531 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
2532 alen + sizeof (uint16_t))
2533 return; /* need more data */
2534 dom_name = (const char *) &dom_len[1];
2535 port = (const uint16_t*) &dom_name[*dom_len];
2536 s5r->domain = GNUNET_strndup (dom_name, *dom_len);
2537 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2538 "Requested connection is to %s:%d\n",
2541 s5r->state = SOCKS5_RESOLVING;
2542 s5r->port = ntohs (*port);
2543 s5r->gns_lookup = GNUNET_GNS_lookup (gns_handle,
2546 GNUNET_DNSPARSER_TYPE_A,
2547 GNUNET_NO /* only cached */,
2548 (GNUNET_YES == do_shorten) ? &local_shorten_zone : NULL,
2554 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2555 _("Unsupported socks address type %d\n"),
2556 (int) c_req->addr_type);
2557 signal_socks_failure (s5r,
2558 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED);
2561 clear_from_s5r_rbuf (s5r,
2562 sizeof (struct Socks5ClientRequestMessage) +
2563 alen + sizeof (uint16_t));
2564 if (0 != s5r->rbuf_len)
2566 /* read more bytes than healthy, why did the client send more!? */
2567 GNUNET_break_op (0);
2568 signal_socks_failure (s5r,
2569 SOCKS5_STATUS_GENERAL_FAILURE);
2572 if (SOCKS5_DATA_TRANSFER == s5r->state)
2574 /* if we are not waiting for GNS resolution, signal success */
2575 signal_socks_success (s5r);
2577 /* We are done reading right now */
2578 GNUNET_SCHEDULER_cancel (s5r->rtask);
2579 s5r->rtask = GNUNET_SCHEDULER_NO_TASK;
2581 case SOCKS5_RESOLVING:
2584 case SOCKS5_DATA_TRANSFER:
2595 * Accept new incoming connections
2597 * @param cls the closure with the lsock4 or lsock6
2598 * @param tc the scheduler context
2601 do_accept (void *cls,
2602 const struct GNUNET_SCHEDULER_TaskContext *tc)
2604 struct GNUNET_NETWORK_Handle *lsock = cls;
2605 struct GNUNET_NETWORK_Handle *s;
2606 struct Socks5Request *s5r;
2608 if (lsock == lsock4)
2609 ltask4 = GNUNET_SCHEDULER_NO_TASK;
2611 ltask6 = GNUNET_SCHEDULER_NO_TASK;
2612 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2614 if (lsock == lsock4)
2615 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2619 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2622 s = GNUNET_NETWORK_socket_accept (lsock, NULL, NULL);
2625 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "accept");
2628 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2629 "Got an inbound connection, waiting for data\n");
2630 s5r = GNUNET_new (struct Socks5Request);
2631 GNUNET_CONTAINER_DLL_insert (s5r_head,
2635 s5r->state = SOCKS5_INIT;
2636 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2642 /* ******************* General / main code ********************* */
2646 * Task run on shutdown
2648 * @param cls closure
2649 * @param tc task context
2652 do_shutdown (void *cls,
2653 const struct GNUNET_SCHEDULER_TaskContext *tc)
2655 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2656 "Shutting down...\n");
2657 while (NULL != mhd_httpd_head)
2658 kill_httpd (mhd_httpd_head);
2659 while (NULL != s5r_head)
2660 cleanup_s5r (s5r_head);
2663 GNUNET_NETWORK_socket_close (lsock4);
2668 GNUNET_NETWORK_socket_close (lsock6);
2673 GNUNET_IDENTITY_cancel (id_op);
2676 if (NULL != identity)
2678 GNUNET_IDENTITY_disconnect (identity);
2681 if (NULL != curl_multi)
2683 curl_multi_cleanup (curl_multi);
2686 if (NULL != gns_handle)
2688 GNUNET_GNS_disconnect (gns_handle);
2691 if (GNUNET_SCHEDULER_NO_TASK != curl_download_task)
2693 GNUNET_SCHEDULER_cancel (curl_download_task);
2694 curl_download_task = GNUNET_SCHEDULER_NO_TASK;
2696 if (GNUNET_SCHEDULER_NO_TASK != ltask4)
2698 GNUNET_SCHEDULER_cancel (ltask4);
2699 ltask4 = GNUNET_SCHEDULER_NO_TASK;
2701 if (GNUNET_SCHEDULER_NO_TASK != ltask6)
2703 GNUNET_SCHEDULER_cancel (ltask6);
2704 ltask6 = GNUNET_SCHEDULER_NO_TASK;
2706 gnutls_x509_crt_deinit (proxy_ca.cert);
2707 gnutls_x509_privkey_deinit (proxy_ca.key);
2708 gnutls_global_deinit ();
2713 * Create an IPv4 listen socket bound to our port.
2715 * @return NULL on error
2717 static struct GNUNET_NETWORK_Handle *
2720 struct GNUNET_NETWORK_Handle *ls;
2721 struct sockaddr_in sa4;
2724 memset (&sa4, 0, sizeof (sa4));
2725 sa4.sin_family = AF_INET;
2726 sa4.sin_port = htons (port);
2727 #if HAVE_SOCKADDR_IN_SIN_LEN
2728 sa4.sin_len = sizeof (sa4);
2730 ls = GNUNET_NETWORK_socket_create (AF_INET,
2736 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa4,
2740 GNUNET_NETWORK_socket_close (ls);
2749 * Create an IPv6 listen socket bound to our port.
2751 * @return NULL on error
2753 static struct GNUNET_NETWORK_Handle *
2756 struct GNUNET_NETWORK_Handle *ls;
2757 struct sockaddr_in6 sa6;
2760 memset (&sa6, 0, sizeof (sa6));
2761 sa6.sin6_family = AF_INET6;
2762 sa6.sin6_port = htons (port);
2763 #if HAVE_SOCKADDR_IN_SIN_LEN
2764 sa6.sin6_len = sizeof (sa6);
2766 ls = GNUNET_NETWORK_socket_create (AF_INET6,
2772 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa6,
2776 GNUNET_NETWORK_socket_close (ls);
2785 * Continue initialization after we have our zone information.
2790 struct MhdHttpList *hd;
2792 /* Open listen socket for socks proxy */
2793 lsock6 = bind_v6 ();
2795 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
2798 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock6, 5))
2800 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
2801 GNUNET_NETWORK_socket_close (lsock6);
2806 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2807 lsock6, &do_accept, lsock6);
2810 lsock4 = bind_v4 ();
2812 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
2815 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock4, 5))
2817 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
2818 GNUNET_NETWORK_socket_close (lsock4);
2823 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
2824 lsock4, &do_accept, lsock4);
2827 if ( (NULL == lsock4) &&
2830 GNUNET_SCHEDULER_shutdown ();
2833 if (0 != curl_global_init (CURL_GLOBAL_WIN32))
2835 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2836 "cURL global init failed!\n");
2837 GNUNET_SCHEDULER_shutdown ();
2840 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2841 "Proxy listens on port %u\n",
2844 /* start MHD daemon for HTTP */
2845 hd = GNUNET_new (struct MhdHttpList);
2846 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_NO_LISTEN_SOCKET,
2849 &create_response, hd,
2850 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
2851 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
2852 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
2854 if (NULL == hd->daemon)
2857 GNUNET_SCHEDULER_shutdown ();
2861 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head, mhd_httpd_tail, hd);
2866 * Method called to inform about the egos of the shorten zone of this peer.
2868 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
2869 * this function is only called ONCE, and 'NULL' being passed in
2870 * @a ego does indicate an error (i.e. name is taken or no default
2871 * value is known). If @a ego is non-NULL and if '*ctx'
2872 * is set in those callbacks, the value WILL be passed to a subsequent
2873 * call to the identity callback of #GNUNET_IDENTITY_connect (if
2874 * that one was not NULL).
2876 * @param cls closure, NULL
2877 * @param ego ego handle
2878 * @param ctx context for application to store data for this ego
2879 * (during the lifetime of this process, initially NULL)
2880 * @param name name assigned by the user for this ego,
2881 * NULL if the user just deleted the ego and it
2882 * must thus no longer be used
2885 identity_shorten_cb (void *cls,
2886 struct GNUNET_IDENTITY_Ego *ego,
2893 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2894 _("No ego configured for `shorten-zone`\n"));
2898 local_shorten_zone = *GNUNET_IDENTITY_ego_get_private_key (ego);
2899 do_shorten = GNUNET_YES;
2906 * Method called to inform about the egos of the master zone of this peer.
2908 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
2909 * this function is only called ONCE, and 'NULL' being passed in
2910 * @a ego does indicate an error (i.e. name is taken or no default
2911 * value is known). If @a ego is non-NULL and if '*ctx'
2912 * is set in those callbacks, the value WILL be passed to a subsequent
2913 * call to the identity callback of #GNUNET_IDENTITY_connect (if
2914 * that one was not NULL).
2916 * @param cls closure, NULL
2917 * @param ego ego handle
2918 * @param ctx context for application to store data for this ego
2919 * (during the lifetime of this process, initially NULL)
2920 * @param name name assigned by the user for this ego,
2921 * NULL if the user just deleted the ego and it
2922 * must thus no longer be used
2925 identity_master_cb (void *cls,
2926 struct GNUNET_IDENTITY_Ego *ego,
2933 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2934 _("No ego configured for `%s`\n"),
2936 GNUNET_SCHEDULER_shutdown ();
2939 GNUNET_IDENTITY_ego_get_public_key (ego,
2941 id_op = GNUNET_IDENTITY_get (identity,
2943 &identity_shorten_cb,
2949 * Main function that will be run
2951 * @param cls closure
2952 * @param args remaining command-line arguments
2953 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
2954 * @param c configuration
2957 run (void *cls, char *const *args, const char *cfgfile,
2958 const struct GNUNET_CONFIGURATION_Handle *c)
2960 char* cafile_cfg = NULL;
2965 if (NULL == (curl_multi = curl_multi_init ()))
2967 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2968 "Failed to create cURL multi handle!\n");
2971 cafile = cafile_opt;
2974 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "gns-proxy",
2978 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
2983 cafile = cafile_cfg;
2985 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2986 "Using %s as CA\n", cafile);
2988 gnutls_global_init ();
2989 gnutls_x509_crt_init (&proxy_ca.cert);
2990 gnutls_x509_privkey_init (&proxy_ca.key);
2992 if ( (GNUNET_OK != load_cert_from_file (proxy_ca.cert, cafile)) ||
2993 (GNUNET_OK != load_key_from_file (proxy_ca.key, cafile)) )
2995 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2996 _("Failed to load SSL/TLS key and certificate from `%s'\n"),
2998 gnutls_x509_crt_deinit (proxy_ca.cert);
2999 gnutls_x509_privkey_deinit (proxy_ca.key);
3000 gnutls_global_deinit ();
3001 GNUNET_free_non_null (cafile_cfg);
3004 GNUNET_free_non_null (cafile_cfg);
3005 if (NULL == (gns_handle = GNUNET_GNS_connect (cfg)))
3007 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3008 "Unable to connect to GNS!\n");
3009 gnutls_x509_crt_deinit (proxy_ca.cert);
3010 gnutls_x509_privkey_deinit (proxy_ca.key);
3011 gnutls_global_deinit ();
3014 identity = GNUNET_IDENTITY_connect (cfg,
3016 id_op = GNUNET_IDENTITY_get (identity,
3018 &identity_master_cb,
3020 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
3021 &do_shutdown, NULL);
3026 * The main function for gnunet-gns-proxy.
3028 * @param argc number of arguments from the command line
3029 * @param argv command line arguments
3030 * @return 0 ok, 1 on error
3033 main (int argc, char *const *argv)
3035 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
3037 gettext_noop ("listen on specified port (default: 7777)"), 1,
3038 &GNUNET_GETOPT_set_ulong, &port},
3039 {'a', "authority", NULL,
3040 gettext_noop ("pem file to use as CA"), 1,
3041 &GNUNET_GETOPT_set_string, &cafile_opt},
3042 GNUNET_GETOPT_OPTION_END
3044 static const char* page =
3045 "<html><head><title>gnunet-gns-proxy</title>"
3046 "</head><body>cURL fail</body></html>";
3049 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
3051 GNUNET_log_setup ("gnunet-gns-proxy", "WARNING", NULL);
3052 curl_failure_response = MHD_create_response_from_buffer (strlen (page),
3054 MHD_RESPMEM_PERSISTENT);
3058 GNUNET_PROGRAM_run (argc, argv, "gnunet-gns-proxy",
3059 _("GNUnet GNS proxy"),
3061 &run, NULL)) ? 0 : 1;
3062 MHD_destroy_response (curl_failure_response);
3063 GNUNET_free_non_null ((char *) argv);
3064 GNUNET_CRYPTO_ecdsa_key_clear (&local_shorten_zone);
3068 /* end of gnunet-gns-proxy.c */