2 This file is part of GNUnet.
3 Copyright (C) 2012-2018 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your 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 Affero General Public License for more details.
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
19 * @author Martin Schanzenbach
20 * @author Christian Grothoff
21 * @file src/gns/gnunet-gns-proxy.c
22 * @brief HTTP(S) proxy that rewrites URIs and fakes certificats to make GNS work
23 * with legacy browsers
26 * - double-check queueing logic
29 #include <microhttpd.h>
31 #include <curl/curl.h>
32 #elif HAVE_GNURL_CURL_H
33 #include <gnurl/curl.h>
35 #include <gnutls/gnutls.h>
36 #include <gnutls/x509.h>
37 #include <gnutls/abstract.h>
38 #include <gnutls/crypto.h>
40 #include <gnutls/dane.h>
43 #include "gnunet_util_lib.h"
44 #include "gnunet_gns_service.h"
45 #include "gnunet_identity_service.h"
51 * Default Socks5 listen port.
53 #define GNUNET_GNS_PROXY_PORT 7777
56 * Maximum supported length for a URI.
57 * Should die. @deprecated
59 #define MAX_HTTP_URI_LENGTH 2048
62 * Size of the buffer for the data upload / download. Must be
63 * enough for curl, thus CURL_MAX_WRITE_SIZE is needed here (16k).
65 #define IO_BUFFERSIZE CURL_MAX_WRITE_SIZE
68 * Size of the read/write buffers for Socks. Uses
69 * 256 bytes for the hostname (at most), plus a few
70 * bytes overhead for the messages.
72 #define SOCKS_BUFFERSIZE (256 + 32)
75 * Port for plaintext HTTP.
82 #define HTTPS_PORT 443
85 * Largest allowed size for a PEM certificate.
87 #define MAX_PEM_SIZE (10 * 1024)
90 * After how long do we clean up unused MHD TLS instances?
92 #define MHD_CACHE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
95 * After how long do we clean up Socks5 handles that failed to show any activity
96 * with their respective MHD instance?
98 #define HTTP_HANDSHAKE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
104 * @param level log level
105 * @param fun name of curl_easy-function that gave the error
106 * @param rc return code from curl
108 #define LOG_CURL_EASY(level,fun,rc) \
110 _("%s failed at %s:%d: `%s'\n"), \
114 curl_easy_strerror (rc))
117 /* *************** Socks protocol definitions (move to TUN?) ****************** */
120 * Which SOCKS version do we speak?
122 #define SOCKS_VERSION_5 0x05
125 * Flag to set for 'no authentication'.
127 #define SOCKS_AUTH_NONE 0
131 * Commands in Socks5.
136 * Establish TCP/IP stream.
138 SOCKS5_CMD_TCP_STREAM = 1,
141 * Establish TCP port binding.
143 SOCKS5_CMD_TCP_PORT = 2,
146 * Establish UDP port binding.
148 SOCKS5_CMD_UDP_PORT = 3
153 * Address types in Socks5.
155 enum Socks5AddressType
165 SOCKS5_AT_DOMAINNAME = 3,
176 * Status codes in Socks5 response.
178 enum Socks5StatusCode
180 SOCKS5_STATUS_REQUEST_GRANTED = 0,
181 SOCKS5_STATUS_GENERAL_FAILURE = 1,
182 SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE = 2,
183 SOCKS5_STATUS_NETWORK_UNREACHABLE = 3,
184 SOCKS5_STATUS_HOST_UNREACHABLE = 4,
185 SOCKS5_STATUS_CONNECTION_REFUSED_BY_HOST = 5,
186 SOCKS5_STATUS_TTL_EXPIRED = 6,
187 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED = 7,
188 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED = 8
193 * Client hello in Socks5 protocol.
195 struct Socks5ClientHelloMessage
198 * Should be #SOCKS_VERSION_5.
203 * How many authentication methods does the client support.
205 uint8_t num_auth_methods;
207 /* followed by supported authentication methods, 1 byte per method */
213 * Server hello in Socks5 protocol.
215 struct Socks5ServerHelloMessage
218 * Should be #SOCKS_VERSION_5.
223 * Chosen authentication method, for us always #SOCKS_AUTH_NONE,
224 * which skips the authentication step.
231 * Client socks request in Socks5 protocol.
233 struct Socks5ClientRequestMessage
236 * Should be #SOCKS_VERSION_5.
241 * Command code, we only uspport #SOCKS5_CMD_TCP_STREAM.
246 * Reserved, always zero.
251 * Address type, an `enum Socks5AddressType`.
256 * Followed by either an ip4/ipv6 address or a domain name with a
257 * length field (uint8_t) in front (depending on @e addr_type).
258 * followed by port number in network byte order (uint16_t).
264 * Server response to client requests in Socks5 protocol.
266 struct Socks5ServerResponseMessage
269 * Should be #SOCKS_VERSION_5.
274 * Status code, an `enum Socks5StatusCode`
284 * Address type, an `enum Socks5AddressType`.
289 * Followed by either an ip4/ipv6 address or a domain name with a
290 * length field (uint8_t) in front (depending on @e addr_type).
291 * followed by port number in network byte order (uint16_t).
298 /* *********************** Datastructures for HTTP handling ****************** */
301 * A structure for CA cert/key
308 gnutls_x509_crt_t cert;
313 gnutls_x509_privkey_t key;
318 * Structure for GNS certificates
320 struct ProxyGNSCertificate
323 * The certificate as PEM
325 char cert[MAX_PEM_SIZE];
328 * The private key as PEM
330 char key[MAX_PEM_SIZE];
336 * A structure for all running Httpds
343 struct MhdHttpList *prev;
348 struct MhdHttpList *next;
351 * the domain name to server (only important for TLS)
358 struct MHD_Daemon *daemon;
361 * Optional proxy certificate used
363 struct ProxyGNSCertificate *proxy_cert;
368 struct GNUNET_SCHEDULER_Task *httpd_task;
371 * is this an ssl daemon?
378 /* ***************** Datastructures for Socks handling **************** */
387 * We're waiting to get the client hello.
392 * We're waiting to get the initial request.
397 * We are currently resolving the destination.
402 * We're in transfer mode.
404 SOCKS5_DATA_TRANSFER,
407 * Finish writing the write buffer, then clean up.
409 SOCKS5_WRITE_THEN_CLEANUP,
412 * Socket has been passed to MHD, do not close it anymore.
414 SOCKS5_SOCKET_WITH_MHD,
417 * We've started receiving upload data from MHD.
419 SOCKS5_SOCKET_UPLOAD_STARTED,
422 * We've finished receiving upload data from MHD.
424 SOCKS5_SOCKET_UPLOAD_DONE,
427 * We've finished uploading data via CURL and can now download.
429 SOCKS5_SOCKET_DOWNLOAD_STARTED,
432 * We've finished receiving download data from cURL.
434 SOCKS5_SOCKET_DOWNLOAD_DONE
441 struct HttpResponseHeader
446 struct HttpResponseHeader *next;
451 struct HttpResponseHeader *prev;
465 * A structure for socks requests
473 struct Socks5Request *next;
478 struct Socks5Request *prev;
483 struct GNUNET_NETWORK_Handle *sock;
486 * Handle to GNS lookup, during #SOCKS5_RESOLVING phase.
488 struct GNUNET_GNS_LookupWithTldRequest *gns_lookup;
491 * Client socket read task
493 struct GNUNET_SCHEDULER_Task *rtask;
496 * Client socket write task
498 struct GNUNET_SCHEDULER_Task *wtask;
503 struct GNUNET_SCHEDULER_Task *timeout_task;
508 char rbuf[SOCKS_BUFFERSIZE];
513 char wbuf[SOCKS_BUFFERSIZE];
516 * Buffer we use for moving data between MHD and curl (in both directions).
518 char io_buf[IO_BUFFERSIZE];
521 * MHD HTTP instance handling this request, NULL for none.
523 struct MhdHttpList *hd;
526 * MHD connection for this request.
528 struct MHD_Connection *con;
531 * MHD response object for this request.
533 struct MHD_Response *response;
536 * the domain name to server (only important for TLS)
541 * DNS Legacy Host Name as given by GNS, NULL if not given.
546 * Payload of the (last) DANE record encountered.
561 * HTTP request headers for the curl request.
563 struct curl_slist *headers;
566 * DNS->IP mappings resolved through GNS
568 struct curl_slist *hosts;
571 * HTTP response code to give to MHD for the response.
573 unsigned int response_code;
576 * Number of bytes in @e dane_data.
578 size_t dane_data_len;
581 * Number of bytes already in read buffer
586 * Number of bytes already in write buffer
591 * Number of bytes already in the IO buffer.
596 * Once known, what's the target address for the connection?
598 struct sockaddr_storage destination_address;
603 enum SocksPhase state;
606 * Desired destination port.
611 * Headers from response
613 struct HttpResponseHeader *header_head;
616 * Headers from response
618 struct HttpResponseHeader *header_tail;
621 * X.509 Certificate status
626 * Was the hostname resolved via GNS?
631 * Did we suspend MHD processing?
636 * Did we pause CURL processing?
643 /* *********************** Globals **************************** */
647 * The port the proxy is running on (default 7777)
649 static uint16_t port = GNUNET_GNS_PROXY_PORT;
652 * The CA file (pem) to use for the proxy CA
654 static char *cafile_opt;
657 * The listen socket of the proxy for IPv4
659 static struct GNUNET_NETWORK_Handle *lsock4;
662 * The listen socket of the proxy for IPv6
664 static struct GNUNET_NETWORK_Handle *lsock6;
667 * The listen task ID for IPv4
669 static struct GNUNET_SCHEDULER_Task * ltask4;
672 * The listen task ID for IPv6
674 static struct GNUNET_SCHEDULER_Task * ltask6;
677 * The cURL download task (curl multi API).
679 static struct GNUNET_SCHEDULER_Task * curl_download_task;
682 * The cURL multi handle
684 static CURLM *curl_multi;
687 * Handle to the GNS service
689 static struct GNUNET_GNS_Handle *gns_handle;
694 static int disable_v6;
697 * DLL for http/https daemons
699 static struct MhdHttpList *mhd_httpd_head;
702 * DLL for http/https daemons
704 static struct MhdHttpList *mhd_httpd_tail;
707 * Daemon for HTTP (we have one per X.509 certificate, and then one for
708 * all HTTP connections; this is the one for HTTP, not HTTPS).
710 static struct MhdHttpList *httpd;
713 * DLL of active socks requests.
715 static struct Socks5Request *s5r_head;
718 * DLL of active socks requests.
720 static struct Socks5Request *s5r_tail;
723 * The CA for X.509 certificate generation
725 static struct ProxyCA proxy_ca;
728 * Response we return on cURL failures.
730 static struct MHD_Response *curl_failure_response;
735 static const struct GNUNET_CONFIGURATION_Handle *cfg;
738 /* ************************* Global helpers ********************* */
742 * Run MHD now, we have extra data ready for the callback.
744 * @param hd the daemon to run now.
747 run_mhd_now (struct MhdHttpList *hd);
751 * Clean up s5r handles.
753 * @param s5r the handle to destroy
756 cleanup_s5r (struct Socks5Request *s5r)
758 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
759 "Cleaning up socks request\n");
760 if (NULL != s5r->curl)
762 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
763 "Cleaning up cURL handle\n");
764 curl_multi_remove_handle (curl_multi,
766 curl_easy_cleanup (s5r->curl);
771 s5r->suspended = GNUNET_NO;
772 MHD_resume_connection (s5r->con);
774 curl_slist_free_all (s5r->headers);
775 if (NULL != s5r->hosts)
777 curl_slist_free_all (s5r->hosts);
779 if ( (NULL != s5r->response) &&
780 (curl_failure_response != s5r->response) )
782 MHD_destroy_response (s5r->response);
783 s5r->response = NULL;
785 if (NULL != s5r->rtask)
787 GNUNET_SCHEDULER_cancel (s5r->rtask);
790 if (NULL != s5r->timeout_task)
792 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
793 s5r->timeout_task = NULL;
795 if (NULL != s5r->wtask)
797 GNUNET_SCHEDULER_cancel (s5r->wtask);
800 if (NULL != s5r->gns_lookup)
802 GNUNET_GNS_lookup_with_tld_cancel (s5r->gns_lookup);
803 s5r->gns_lookup = NULL;
805 if (NULL != s5r->sock)
807 if (SOCKS5_SOCKET_WITH_MHD <= s5r->state)
808 GNUNET_NETWORK_socket_free_memory_only_ (s5r->sock);
810 GNUNET_NETWORK_socket_close (s5r->sock);
813 GNUNET_CONTAINER_DLL_remove (s5r_head,
816 GNUNET_free_non_null (s5r->domain);
817 GNUNET_free_non_null (s5r->leho);
818 GNUNET_free_non_null (s5r->url);
819 GNUNET_free_non_null (s5r->dane_data);
824 /* ************************* HTTP handling with cURL *********************** */
827 curl_download_prepare ();
831 * Callback for MHD response generation. This function is called from
832 * MHD whenever MHD expects to get data back. Copies data from the
833 * io_buf, if available.
835 * @param cls closure with our `struct Socks5Request`
836 * @param pos in buffer
837 * @param buf where to copy data
838 * @param max available space in @a buf
839 * @return number of bytes written to @a buf
842 mhd_content_cb (void *cls,
847 struct Socks5Request *s5r = cls;
848 size_t bytes_to_copy;
850 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
851 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
853 /* we're still not done with the upload, do not yet
854 start the download, the IO buffer is still full
856 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
857 "Pausing MHD download %s%s, not yet ready for download\n",
860 return 0; /* not yet ready for data download */
862 bytes_to_copy = GNUNET_MIN (max,
864 if ( (0 == bytes_to_copy) &&
865 (SOCKS5_SOCKET_DOWNLOAD_DONE != s5r->state) )
867 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
868 "Pausing MHD download %s%s, no data available\n",
871 if (NULL != s5r->curl)
873 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
874 "Continuing CURL interaction for %s%s\n",
877 if (GNUNET_YES == s5r->curl_paused)
879 s5r->curl_paused = GNUNET_NO;
880 curl_easy_pause (s5r->curl,
883 curl_download_prepare ();
885 if (GNUNET_NO == s5r->suspended)
887 MHD_suspend_connection (s5r->con);
888 s5r->suspended = GNUNET_YES;
890 return 0; /* more data later */
892 if ( (0 == bytes_to_copy) &&
893 (SOCKS5_SOCKET_DOWNLOAD_DONE == s5r->state) )
895 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
896 "Completed MHD download %s%s\n",
899 return MHD_CONTENT_READER_END_OF_STREAM;
901 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
902 "Writing %llu/%llu bytes to %s%s\n",
903 (unsigned long long) bytes_to_copy,
904 (unsigned long long) s5r->io_len,
910 memmove (s5r->io_buf,
911 &s5r->io_buf[bytes_to_copy],
912 s5r->io_len - bytes_to_copy);
913 s5r->io_len -= bytes_to_copy;
914 if ( (NULL != s5r->curl) &&
915 (GNUNET_YES == s5r->curl_paused) )
917 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
918 "Continuing CURL interaction for %s%s\n",
921 s5r->curl_paused = GNUNET_NO;
922 curl_easy_pause (s5r->curl,
925 return bytes_to_copy;
930 * Check that the website has presented us with a valid X.509 certificate.
931 * The certificate must either match the domain name or the LEHO name
932 * (or, if available, the TLSA record).
934 * @param s5r request to check for.
935 * @return #GNUNET_OK if the certificate is valid
938 check_ssl_certificate (struct Socks5Request *s5r)
940 unsigned int cert_list_size;
941 const gnutls_datum_t *chainp;
942 const struct curl_tlssessioninfo *tlsinfo;
943 char certdn[GNUNET_DNSPARSER_MAX_NAME_LENGTH + 3];
945 gnutls_x509_crt_t x509_cert;
949 s5r->ssl_checked = GNUNET_YES;
950 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
951 "Checking X.509 certificate\n");
953 curl_easy_getinfo (s5r->curl,
954 CURLINFO_TLS_SESSION,
955 (struct curl_slist **) &tlsinfo))
956 return GNUNET_SYSERR;
957 if (CURLSSLBACKEND_GNUTLS != tlsinfo->backend)
959 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
960 _("Unsupported CURL TLS backend %d\n"),
962 return GNUNET_SYSERR;
964 chainp = gnutls_certificate_get_peers (tlsinfo->internals,
967 (0 == cert_list_size) )
968 return GNUNET_SYSERR;
970 size = sizeof (certdn);
971 /* initialize an X.509 certificate structure. */
972 gnutls_x509_crt_init (&x509_cert);
973 gnutls_x509_crt_import (x509_cert,
975 GNUTLS_X509_FMT_DER);
977 if (0 != (rc = gnutls_x509_crt_get_dn_by_oid (x509_cert,
978 GNUTLS_OID_X520_COMMON_NAME,
979 0, /* the first and only one */
980 0 /* no DER encoding */,
984 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
985 _("Failed to fetch CN from cert: %s\n"),
986 gnutls_strerror(rc));
987 gnutls_x509_crt_deinit (x509_cert);
988 return GNUNET_SYSERR;
990 /* check for TLSA/DANE records */
992 if (NULL != s5r->dane_data)
994 char *dd[] = { s5r->dane_data, NULL };
995 int dlen[] = { s5r->dane_data_len, 0};
996 dane_state_t dane_state;
997 dane_query_t dane_query;
1000 /* FIXME: add flags to gnutls to NOT read UNBOUND_ROOT_KEY_FILE here! */
1001 if (0 != (rc = dane_state_init (&dane_state,
1002 #ifdef DANE_F_IGNORE_DNSSEC
1003 DANE_F_IGNORE_DNSSEC |
1005 DANE_F_IGNORE_LOCAL_RESOLVER)))
1007 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1008 _("Failed to initialize DANE: %s\n"),
1010 gnutls_x509_crt_deinit (x509_cert);
1011 return GNUNET_SYSERR;
1013 if (0 != (rc = dane_raw_tlsa (dane_state,
1020 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1021 _("Failed to parse DANE record: %s\n"),
1023 dane_state_deinit (dane_state);
1024 gnutls_x509_crt_deinit (x509_cert);
1025 return GNUNET_SYSERR;
1027 if (0 != (rc = dane_verify_crt_raw (dane_state,
1030 gnutls_certificate_type_get (tlsinfo->internals),
1035 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1036 _("Failed to verify TLS connection using DANE: %s\n"),
1038 dane_query_deinit (dane_query);
1039 dane_state_deinit (dane_state);
1040 gnutls_x509_crt_deinit (x509_cert);
1041 return GNUNET_SYSERR;
1045 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1046 _("Failed DANE verification failed with GnuTLS verify status code: %u\n"),
1048 dane_query_deinit (dane_query);
1049 dane_state_deinit (dane_state);
1050 gnutls_x509_crt_deinit (x509_cert);
1051 return GNUNET_SYSERR;
1053 dane_query_deinit (dane_query);
1054 dane_state_deinit (dane_state);
1060 /* try LEHO or ordinary domain name X509 verification */
1062 if (NULL != s5r->leho)
1066 if (0 == (rc = gnutls_x509_crt_check_hostname (x509_cert,
1069 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1070 _("TLS certificate subject name (%s) does not match `%s': %d\n"),
1074 gnutls_x509_crt_deinit (x509_cert);
1075 return GNUNET_SYSERR;
1080 /* we did not even have the domain name!? */
1082 return GNUNET_SYSERR;
1085 gnutls_x509_crt_deinit (x509_cert);
1091 * We're getting an HTTP response header from cURL. Convert it to the
1092 * MHD response headers. Mostly copies the headers, but makes special
1093 * adjustments to "Set-Cookie" and "Location" headers as those may need
1094 * to be changed from the LEHO to the domain the browser expects.
1096 * @param buffer curl buffer with a single line of header data; not 0-terminated!
1097 * @param size curl blocksize
1098 * @param nmemb curl blocknumber
1099 * @param cls our `struct Socks5Request *`
1100 * @return size of processed bytes
1103 curl_check_hdr (void *buffer,
1108 struct Socks5Request *s5r = cls;
1109 struct HttpResponseHeader *header;
1110 size_t bytes = size * nmemb;
1112 const char *hdr_type;
1113 const char *cookie_domain;
1115 char *new_cookie_hdr;
1118 size_t delta_cdomain;
1122 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1123 "Receiving HTTP response header from CURL\n");
1124 /* first, check TLS certificate */
1125 if ( (GNUNET_YES != s5r->ssl_checked) &&
1126 (HTTPS_PORT == s5r->port))
1128 if (GNUNET_OK != check_ssl_certificate (s5r))
1131 ndup = GNUNET_strndup (buffer,
1133 hdr_type = strtok (ndup,
1135 if (NULL == hdr_type)
1140 hdr_val = strtok (NULL,
1142 if (NULL == hdr_val)
1147 if (' ' == *hdr_val)
1150 /* custom logic for certain header types */
1151 new_cookie_hdr = NULL;
1152 if ( (NULL != s5r->leho) &&
1153 (0 == strcasecmp (hdr_type,
1154 MHD_HTTP_HEADER_SET_COOKIE)) )
1157 new_cookie_hdr = GNUNET_malloc (strlen (hdr_val) +
1158 strlen (s5r->domain) + 1);
1160 domain_matched = GNUNET_NO; /* make sure we match domain at most once */
1161 for (tok = strtok (hdr_val, ";"); NULL != tok; tok = strtok (NULL, ";"))
1163 if ( (0 == strncasecmp (tok,
1165 strlen (" domain"))) &&
1166 (GNUNET_NO == domain_matched) )
1168 domain_matched = GNUNET_YES;
1169 cookie_domain = tok + strlen (" domain") + 1;
1170 if (strlen (cookie_domain) < strlen (s5r->leho))
1172 delta_cdomain = strlen (s5r->leho) - strlen (cookie_domain);
1173 if (0 == strcasecmp (cookie_domain,
1174 s5r->leho + delta_cdomain))
1176 offset += sprintf (new_cookie_hdr + offset,
1182 else if (0 == strcmp (cookie_domain,
1185 offset += sprintf (new_cookie_hdr + offset,
1190 else if ( ('.' == cookie_domain[0]) &&
1191 (0 == strcmp (&cookie_domain[1],
1194 offset += sprintf (new_cookie_hdr + offset,
1199 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1200 _("Cookie domain `%s' supplied by server is invalid\n"),
1203 GNUNET_memcpy (new_cookie_hdr + offset,
1206 offset += strlen (tok);
1207 new_cookie_hdr[offset++] = ';';
1209 hdr_val = new_cookie_hdr;
1212 new_location = NULL;
1213 if (0 == strcasecmp (MHD_HTTP_HEADER_TRANSFER_ENCODING,
1216 /* Ignore transfer encoding, set automatically by MHD if required */
1219 if (0 == strcasecmp (MHD_HTTP_HEADER_LOCATION,
1224 GNUNET_asprintf (&leho_host,
1225 (HTTPS_PORT != s5r->port)
1229 if (0 == strncmp (leho_host,
1231 strlen (leho_host)))
1233 GNUNET_asprintf (&new_location,
1235 (HTTPS_PORT != s5r->port)
1239 hdr_val + strlen (leho_host));
1240 hdr_val = new_location;
1242 GNUNET_free (leho_host);
1244 /* MHD does not allow certain characters in values, remove those */
1245 if (NULL != (tok = strchr (hdr_val, '\n')))
1247 if (NULL != (tok = strchr (hdr_val, '\r')))
1249 if (NULL != (tok = strchr (hdr_val, '\t')))
1251 if (0 != strlen (hdr_val)) /* Rely in MHD to set those */
1253 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1254 "Adding header %s: %s to MHD response\n",
1257 header = GNUNET_new (struct HttpResponseHeader);
1258 header->type = GNUNET_strdup (hdr_type);
1259 header->value = GNUNET_strdup (hdr_val);
1260 GNUNET_CONTAINER_DLL_insert (s5r->header_head,
1266 GNUNET_free_non_null (new_cookie_hdr);
1267 GNUNET_free_non_null (new_location);
1273 * Create an MHD response object in @a s5r matching the
1274 * information we got from curl.
1276 * @param s5r the request for which we convert the response
1277 * @return #GNUNET_OK on success, #GNUNET_SYSERR if response was
1278 * already initialized before
1281 create_mhd_response_from_s5r (struct Socks5Request *s5r)
1284 double content_length;
1286 if (NULL != s5r->response)
1288 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1289 "Response already set!\n");
1290 return GNUNET_SYSERR;
1293 GNUNET_break (CURLE_OK ==
1294 curl_easy_getinfo (s5r->curl,
1295 CURLINFO_RESPONSE_CODE,
1297 GNUNET_break (CURLE_OK ==
1298 curl_easy_getinfo (s5r->curl,
1299 CURLINFO_CONTENT_LENGTH_DOWNLOAD,
1301 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1302 "Creating MHD response with code %d and size %d for %s%s\n",
1304 (int) content_length,
1307 s5r->response_code = resp_code;
1308 s5r->response = MHD_create_response_from_callback ((-1 == content_length)
1315 for (struct HttpResponseHeader *header = s5r->header_head;
1317 header = header->next)
1319 GNUNET_break (MHD_YES ==
1320 MHD_add_response_header (s5r->response,
1325 if (NULL != s5r->leho)
1329 GNUNET_asprintf (&cors_hdr,
1330 (HTTPS_PORT == s5r->port)
1335 GNUNET_break (MHD_YES ==
1336 MHD_add_response_header (s5r->response,
1337 MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN,
1339 GNUNET_free (cors_hdr);
1341 /* force connection to be closed after each request, as we
1342 do not support HTTP pipelining (yet, FIXME!) */
1343 /*GNUNET_break (MHD_YES ==
1344 MHD_add_response_header (s5r->response,
1345 MHD_HTTP_HEADER_CONNECTION,
1347 MHD_resume_connection (s5r->con);
1348 s5r->suspended = GNUNET_NO;
1354 * Handle response payload data from cURL. Copies it into our `io_buf` to make
1355 * it available to MHD.
1357 * @param ptr pointer to the data
1358 * @param size number of blocks of data
1359 * @param nmemb blocksize
1360 * @param ctx our `struct Socks5Request *`
1361 * @return number of bytes handled
1364 curl_download_cb (void *ptr,
1369 struct Socks5Request *s5r = ctx;
1370 size_t total = size * nmemb;
1372 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1373 "Receiving %ux%u bytes for `%s%s' from cURL\n",
1374 (unsigned int) size,
1375 (unsigned int) nmemb,
1378 if (NULL == s5r->response)
1379 GNUNET_assert (GNUNET_OK ==
1380 create_mhd_response_from_s5r (s5r));
1382 if ( (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
1383 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1385 /* we're still not done with the upload, do not yet
1386 start the download, the IO buffer is still full
1387 with upload data. */
1388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1389 "Pausing CURL download `%s%s', waiting for UPLOAD to finish\n",
1392 s5r->curl_paused = GNUNET_YES;
1393 return CURL_WRITEFUNC_PAUSE; /* not yet ready for data download */
1395 if (sizeof (s5r->io_buf) - s5r->io_len < total)
1397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1398 "Pausing CURL `%s%s' download, not enough space %llu %llu %llu\n",
1401 (unsigned long long) sizeof (s5r->io_buf),
1402 (unsigned long long) s5r->io_len,
1403 (unsigned long long) total);
1404 s5r->curl_paused = GNUNET_YES;
1405 return CURL_WRITEFUNC_PAUSE; /* not enough space */
1407 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
1410 s5r->io_len += total;
1411 if (GNUNET_YES == s5r->suspended)
1413 MHD_resume_connection (s5r->con);
1414 s5r->suspended = GNUNET_NO;
1416 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1417 "Received %llu bytes of payload via cURL from %s\n",
1418 (unsigned long long) total,
1420 if (s5r->io_len == total)
1421 run_mhd_now (s5r->hd);
1427 * cURL callback for uploaded (PUT/POST) data. Copies it into our `io_buf`
1428 * to make it available to MHD.
1430 * @param buf where to write the data
1431 * @param size number of bytes per member
1432 * @param nmemb number of members available in @a buf
1433 * @param cls our `struct Socks5Request` that generated the data
1434 * @return number of bytes copied to @a buf
1437 curl_upload_cb (void *buf,
1442 struct Socks5Request *s5r = cls;
1443 size_t len = size * nmemb;
1446 if ( (0 == s5r->io_len) &&
1447 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1449 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1450 "Pausing CURL UPLOAD %s%s, need more data\n",
1453 return CURL_READFUNC_PAUSE;
1455 if ( (0 == s5r->io_len) &&
1456 (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) )
1458 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
1459 if (GNUNET_YES == s5r->curl_paused)
1461 s5r->curl_paused = GNUNET_NO;
1462 curl_easy_pause (s5r->curl,
1465 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1466 "Completed CURL UPLOAD %s%s\n",
1469 return 0; /* upload finished, can now download */
1471 if ( (SOCKS5_SOCKET_UPLOAD_STARTED != s5r->state) &&
1472 (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state) )
1475 return CURL_READFUNC_ABORT;
1477 to_copy = GNUNET_MIN (s5r->io_len,
1482 memmove (s5r->io_buf,
1483 &s5r->io_buf[to_copy],
1484 s5r->io_len - to_copy);
1485 s5r->io_len -= to_copy;
1486 if (s5r->io_len + to_copy == sizeof (s5r->io_buf))
1487 run_mhd_now (s5r->hd); /* got more space for upload now */
1492 /* ************************** main loop of cURL interaction ****************** */
1496 * Task that is run when we are ready to receive more data
1499 * @param cls closure
1502 curl_task_download (void *cls);
1506 * Ask cURL for the select() sets and schedule cURL operations.
1509 curl_download_prepare ()
1516 struct GNUNET_NETWORK_FDSet *grs;
1517 struct GNUNET_NETWORK_FDSet *gws;
1519 struct GNUNET_TIME_Relative rtime;
1521 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1522 "Scheduling CURL interaction\n");
1523 if (NULL != curl_download_task)
1525 GNUNET_SCHEDULER_cancel (curl_download_task);
1526 curl_download_task = NULL;
1532 if (CURLM_OK != (mret = curl_multi_fdset (curl_multi,
1538 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1539 "%s failed at %s:%d: `%s'\n",
1540 "curl_multi_fdset", __FILE__, __LINE__,
1541 curl_multi_strerror (mret));
1545 GNUNET_break (CURLM_OK ==
1546 curl_multi_timeout (curl_multi,
1549 rtime = GNUNET_TIME_UNIT_FOREVER_REL;
1551 rtime = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
1555 grs = GNUNET_NETWORK_fdset_create ();
1556 gws = GNUNET_NETWORK_fdset_create ();
1557 GNUNET_NETWORK_fdset_copy_native (grs,
1560 GNUNET_NETWORK_fdset_copy_native (gws,
1563 curl_download_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1567 &curl_task_download,
1569 GNUNET_NETWORK_fdset_destroy (gws);
1570 GNUNET_NETWORK_fdset_destroy (grs);
1574 curl_download_task = GNUNET_SCHEDULER_add_delayed (rtime,
1575 &curl_task_download,
1582 * Task that is run when we are ready to receive more data from curl.
1584 * @param cls closure, NULL
1587 curl_task_download (void *cls)
1591 struct CURLMsg *msg;
1593 struct Socks5Request *s5r;
1595 curl_download_task = NULL;
1596 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1597 "Running CURL interaction\n");
1601 mret = curl_multi_perform (curl_multi,
1603 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1604 "Checking CURL multi status: %d\n",
1606 while (NULL != (msg = curl_multi_info_read (curl_multi,
1609 GNUNET_break (CURLE_OK ==
1610 curl_easy_getinfo (msg->easy_handle,
1621 /* documentation says this is not used */
1625 switch (msg->data.result)
1628 case CURLE_GOT_NOTHING:
1629 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1630 "CURL download %s%s completed.\n",
1633 if (NULL == s5r->response)
1635 GNUNET_assert (GNUNET_OK ==
1636 create_mhd_response_from_s5r (s5r));
1638 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1639 if (GNUNET_YES == s5r->suspended)
1641 MHD_resume_connection (s5r->con);
1642 s5r->suspended = GNUNET_NO;
1644 run_mhd_now (s5r->hd);
1647 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1648 "Download curl %s%s failed: %s\n",
1651 curl_easy_strerror (msg->data.result));
1652 /* FIXME: indicate error somehow? close MHD connection badly as well? */
1653 s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
1654 if (GNUNET_YES == s5r->suspended)
1656 MHD_resume_connection (s5r->con);
1657 s5r->suspended = GNUNET_NO;
1659 run_mhd_now (s5r->hd);
1662 if (NULL == s5r->response)
1663 s5r->response = curl_failure_response;
1666 /* documentation says this is not used */
1670 /* unexpected status code */
1675 } while (mret == CURLM_CALL_MULTI_PERFORM);
1676 if (CURLM_OK != mret)
1677 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1678 "%s failed at %s:%d: `%s'\n",
1679 "curl_multi_perform", __FILE__, __LINE__,
1680 curl_multi_strerror (mret));
1683 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1684 "Suspending cURL multi loop, no more events pending\n");
1685 if (NULL != curl_download_task)
1687 GNUNET_SCHEDULER_cancel (curl_download_task);
1688 curl_download_task = NULL;
1690 return; /* nothing more in progress */
1692 curl_download_prepare ();
1696 /* ********************************* MHD response generation ******************* */
1700 * Read HTTP request header field from the request. Copies the fields
1701 * over to the 'headers' that will be given to curl. However, 'Host'
1702 * is substituted with the LEHO if present. We also change the
1703 * 'Connection' header value to "close" as the proxy does not support
1706 * @param cls our `struct Socks5Request`
1707 * @param kind value kind
1708 * @param key field key
1709 * @param value field value
1710 * @return #MHD_YES to continue to iterate
1713 con_val_iter (void *cls,
1714 enum MHD_ValueKind kind,
1718 struct Socks5Request *s5r = cls;
1721 if ( (0 == strcasecmp (MHD_HTTP_HEADER_HOST,
1723 (NULL != s5r->leho) )
1725 GNUNET_asprintf (&hdr,
1729 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1730 "Adding HEADER `%s' to HTTP request\n",
1732 s5r->headers = curl_slist_append (s5r->headers,
1740 * Main MHD callback for handling requests.
1743 * @param con MHD connection handle
1744 * @param url the url in the request
1745 * @param meth the HTTP method used ("GET", "PUT", etc.)
1746 * @param ver the HTTP version string (i.e. "HTTP/1.1")
1747 * @param upload_data the data being uploaded (excluding HEADERS,
1748 * for a POST that fits into memory and that is encoded
1749 * with a supported encoding, the POST data will NOT be
1750 * given in upload_data and is instead available as
1751 * part of MHD_get_connection_values; very large POST
1752 * data *will* be made available incrementally in
1754 * @param upload_data_size set initially to the size of the
1755 * @a upload_data provided; the method must update this
1756 * value to the number of bytes NOT processed;
1757 * @param con_cls pointer to location where we store the `struct Request`
1758 * @return #MHD_YES if the connection was handled successfully,
1759 * #MHD_NO if the socket must be closed due to a serious
1760 * error while handling the request
1763 create_response (void *cls,
1764 struct MHD_Connection *con,
1768 const char *upload_data,
1769 size_t *upload_data_size,
1772 struct Socks5Request *s5r = *con_cls;
1774 char ipstring[INET6_ADDRSTRLEN];
1775 char ipaddr[INET6_ADDRSTRLEN + 2];
1776 const struct sockaddr *sa;
1777 const struct sockaddr_in *s4;
1778 const struct sockaddr_in6 *s6;
1788 /* Fresh connection. */
1789 if (SOCKS5_SOCKET_WITH_MHD == s5r->state)
1791 /* first time here, initialize curl handle */
1794 sa = (const struct sockaddr *) &s5r->destination_address;
1795 switch (sa->sa_family)
1798 s4 = (const struct sockaddr_in *) &s5r->destination_address;
1799 if (NULL == inet_ntop (AF_INET,
1807 GNUNET_snprintf (ipaddr,
1811 port = ntohs (s4->sin_port);
1814 s6 = (const struct sockaddr_in6 *) &s5r->destination_address;
1815 if (NULL == inet_ntop (AF_INET6,
1823 GNUNET_snprintf (ipaddr,
1827 port = ntohs (s6->sin6_port);
1838 if (NULL == s5r->curl)
1839 s5r->curl = curl_easy_init ();
1840 if (NULL == s5r->curl)
1841 return MHD_queue_response (con,
1842 MHD_HTTP_INTERNAL_SERVER_ERROR,
1843 curl_failure_response);
1844 curl_easy_setopt (s5r->curl,
1845 CURLOPT_HEADERFUNCTION,
1847 curl_easy_setopt (s5r->curl,
1850 curl_easy_setopt (s5r->curl,
1851 CURLOPT_FOLLOWLOCATION,
1854 curl_easy_setopt (s5r->curl,
1857 curl_easy_setopt (s5r->curl,
1858 CURLOPT_CONNECTTIMEOUT,
1860 curl_easy_setopt (s5r->curl,
1863 curl_easy_setopt (s5r->curl,
1866 curl_easy_setopt (s5r->curl,
1867 CURLOPT_HTTP_CONTENT_DECODING,
1869 curl_easy_setopt (s5r->curl,
1872 curl_easy_setopt (s5r->curl,
1875 curl_easy_setopt (s5r->curl,
1879 * Pre-populate cache to resolve Hostname.
1880 * This is necessary as the DNS name in the CURLOPT_URL is used
1881 * for SNI http://de.wikipedia.org/wiki/Server_Name_Indication
1883 if (NULL != s5r->leho)
1887 GNUNET_asprintf (&curl_hosts,
1892 s5r->hosts = curl_slist_append (NULL,
1894 curl_easy_setopt (s5r->curl,
1897 GNUNET_free (curl_hosts);
1901 GNUNET_asprintf (&curlurl,
1902 (HTTPS_PORT != s5r->port)
1904 : "https://%s:%d%s",
1913 GNUNET_asprintf (&curlurl,
1914 (HTTPS_PORT != s5r->port)
1916 : "https://%s:%d%s",
1921 curl_easy_setopt (s5r->curl,
1924 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1925 "Launching %s CURL interaction, fetching `%s'\n",
1926 (s5r->is_gns) ? "GNS" : "DNS",
1928 GNUNET_free (curlurl);
1929 if (0 == strcasecmp (meth,
1930 MHD_HTTP_METHOD_PUT))
1932 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1933 curl_easy_setopt (s5r->curl,
1936 curl_easy_setopt (s5r->curl,
1937 CURLOPT_WRITEFUNCTION,
1939 curl_easy_setopt (s5r->curl,
1942 GNUNET_assert (CURLE_OK ==
1943 curl_easy_setopt (s5r->curl,
1944 CURLOPT_READFUNCTION,
1946 curl_easy_setopt (s5r->curl,
1951 long upload_size = 0;
1953 us = MHD_lookup_connection_value (con,
1955 MHD_HTTP_HEADER_CONTENT_LENGTH);
1956 if ( (1 == sscanf (us,
1959 (upload_size >= 0) )
1961 curl_easy_setopt (s5r->curl,
1967 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_POST))
1969 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1970 curl_easy_setopt (s5r->curl,
1973 curl_easy_setopt (s5r->curl,
1974 CURLOPT_WRITEFUNCTION,
1976 curl_easy_setopt (s5r->curl,
1979 curl_easy_setopt (s5r->curl,
1980 CURLOPT_READFUNCTION,
1982 curl_easy_setopt (s5r->curl,
1989 us = MHD_lookup_connection_value (con,
1991 MHD_HTTP_HEADER_CONTENT_LENGTH);
1992 if ( (NULL != us) &&
1996 (upload_size >= 0) )
1998 curl_easy_setopt (s5r->curl,
2002 curl_easy_setopt (s5r->curl,
2008 else if (0 == strcasecmp (meth,
2009 MHD_HTTP_METHOD_HEAD))
2011 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2012 curl_easy_setopt (s5r->curl,
2016 else if (0 == strcasecmp (meth,
2017 MHD_HTTP_METHOD_OPTIONS))
2019 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2020 curl_easy_setopt (s5r->curl,
2021 CURLOPT_CUSTOMREQUEST,
2023 curl_easy_setopt (s5r->curl,
2024 CURLOPT_WRITEFUNCTION,
2026 curl_easy_setopt (s5r->curl,
2031 else if (0 == strcasecmp (meth,
2032 MHD_HTTP_METHOD_GET))
2034 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2035 curl_easy_setopt (s5r->curl,
2038 curl_easy_setopt (s5r->curl,
2039 CURLOPT_WRITEFUNCTION,
2041 curl_easy_setopt (s5r->curl,
2045 else if (0 == strcasecmp (meth,
2046 MHD_HTTP_METHOD_DELETE))
2048 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2049 curl_easy_setopt (s5r->curl,
2050 CURLOPT_CUSTOMREQUEST,
2052 curl_easy_setopt (s5r->curl,
2053 CURLOPT_WRITEFUNCTION,
2055 curl_easy_setopt (s5r->curl,
2061 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2062 _("Unsupported HTTP method `%s'\n"),
2064 curl_easy_cleanup (s5r->curl);
2069 if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_0))
2071 curl_easy_setopt (s5r->curl,
2072 CURLOPT_HTTP_VERSION,
2073 CURL_HTTP_VERSION_1_0);
2075 else if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_1))
2077 curl_easy_setopt (s5r->curl,
2078 CURLOPT_HTTP_VERSION,
2079 CURL_HTTP_VERSION_1_1);
2083 curl_easy_setopt (s5r->curl,
2084 CURLOPT_HTTP_VERSION,
2085 CURL_HTTP_VERSION_NONE);
2088 if (HTTPS_PORT == s5r->port)
2090 curl_easy_setopt (s5r->curl,
2093 if (NULL != s5r->dane_data)
2094 curl_easy_setopt (s5r->curl,
2095 CURLOPT_SSL_VERIFYPEER,
2098 curl_easy_setopt (s5r->curl,
2099 CURLOPT_SSL_VERIFYPEER,
2101 /* Disable cURL checking the hostname, as we will check ourselves
2102 as only we have the domain name or the LEHO or the DANE record */
2103 curl_easy_setopt (s5r->curl,
2104 CURLOPT_SSL_VERIFYHOST,
2109 curl_easy_setopt (s5r->curl,
2115 curl_multi_add_handle (curl_multi,
2119 curl_easy_cleanup (s5r->curl);
2123 MHD_get_connection_values (con,
2127 curl_easy_setopt (s5r->curl,
2130 curl_download_prepare ();
2134 /* continuing to process request */
2135 if (0 != *upload_data_size)
2137 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2138 "Processing %u bytes UPLOAD\n",
2139 (unsigned int) *upload_data_size);
2141 /* FIXME: This must be set or a header with Transfer-Encoding: chunked. Else
2142 * upload callback is not called!
2144 curl_easy_setopt (s5r->curl,
2145 CURLOPT_POSTFIELDSIZE,
2148 left = GNUNET_MIN (*upload_data_size,
2149 sizeof (s5r->io_buf) - s5r->io_len);
2150 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
2153 s5r->io_len += left;
2154 *upload_data_size -= left;
2155 GNUNET_assert (NULL != s5r->curl);
2156 if (GNUNET_YES == s5r->curl_paused)
2158 s5r->curl_paused = GNUNET_NO;
2159 curl_easy_pause (s5r->curl,
2164 if (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state)
2166 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2167 "Finished processing UPLOAD\n");
2168 s5r->state = SOCKS5_SOCKET_UPLOAD_DONE;
2170 if (NULL == s5r->response)
2172 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2173 "Waiting for HTTP response for %s%s...\n",
2176 MHD_suspend_connection (con);
2177 s5r->suspended = GNUNET_YES;
2180 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2181 "Queueing response for %s%s with MHD\n",
2184 run_mhd_now (s5r->hd);
2185 return MHD_queue_response (con,
2191 /* ******************** MHD HTTP setup and event loop ******************** */
2195 * Function called when MHD decides that we are done with a request.
2198 * @param connection connection handle
2199 * @param con_cls value as set by the last call to
2200 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
2201 * @param toe reason for request termination (ignored)
2204 mhd_completed_cb (void *cls,
2205 struct MHD_Connection *connection,
2207 enum MHD_RequestTerminationCode toe)
2209 struct Socks5Request *s5r = *con_cls;
2213 if (MHD_REQUEST_TERMINATED_COMPLETED_OK != toe)
2214 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2215 "MHD encountered error handling request: %d\n",
2217 if (NULL != s5r->curl)
2219 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2220 "Removing cURL handle (MHD interaction complete)\n");
2221 curl_multi_remove_handle (curl_multi,
2223 curl_slist_free_all (s5r->headers);
2224 s5r->headers = NULL;
2225 curl_easy_reset (s5r->curl);
2229 curl_download_prepare ();
2231 if ( (NULL != s5r->response) &&
2232 (curl_failure_response != s5r->response) )
2233 MHD_destroy_response (s5r->response);
2234 for (struct HttpResponseHeader *header = s5r->header_head;
2236 header = s5r->header_head)
2238 GNUNET_CONTAINER_DLL_remove (s5r->header_head,
2241 GNUNET_free (header->type);
2242 GNUNET_free (header->value);
2243 GNUNET_free (header);
2245 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2246 "Finished request for %s\n",
2248 GNUNET_free (s5r->url);
2249 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2251 s5r->response = NULL;
2257 * Function called when MHD connection is opened or closed.
2260 * @param connection connection handle
2261 * @param con_cls value as set by the last call to
2262 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
2263 * @param toe connection notification type
2266 mhd_connection_cb (void *cls,
2267 struct MHD_Connection *connection,
2269 enum MHD_ConnectionNotificationCode cnc)
2271 struct Socks5Request *s5r;
2272 const union MHD_ConnectionInfo *ci;
2277 case MHD_CONNECTION_NOTIFY_STARTED:
2278 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection started...\n");
2279 ci = MHD_get_connection_info (connection,
2280 MHD_CONNECTION_INFO_CONNECTION_FD);
2286 sock = ci->connect_fd;
2287 for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
2289 if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
2291 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2292 "Context set...\n");
2293 s5r->ssl_checked = GNUNET_NO;
2299 case MHD_CONNECTION_NOTIFY_CLOSED:
2300 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2301 "Connection closed... cleaning up\n");
2305 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2306 "Connection stale!\n");
2310 curl_download_prepare ();
2319 * Function called when MHD first processes an incoming connection.
2320 * Gives us the respective URI information.
2322 * We use this to associate the `struct MHD_Connection` with our
2323 * internal `struct Socks5Request` data structure (by checking
2324 * for matching sockets).
2326 * @param cls the HTTP server handle (a `struct MhdHttpList`)
2327 * @param url the URL that is being requested
2328 * @param connection MHD connection object for the request
2329 * @return the `struct Socks5Request` that this @a connection is for
2332 mhd_log_callback (void *cls,
2334 struct MHD_Connection *connection)
2336 struct Socks5Request *s5r;
2337 const union MHD_ConnectionInfo *ci;
2339 ci = MHD_get_connection_info (connection,
2340 MHD_CONNECTION_INFO_SOCKET_CONTEXT);
2341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Processing %s\n", url);
2347 s5r = ci->socket_context;
2348 if (NULL != s5r->url)
2353 s5r->url = GNUNET_strdup (url);
2354 if (NULL != s5r->timeout_task)
2356 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
2357 s5r->timeout_task = NULL;
2359 GNUNET_assert (s5r->state == SOCKS5_SOCKET_WITH_MHD);
2365 * Kill the given MHD daemon.
2367 * @param hd daemon to stop
2370 kill_httpd (struct MhdHttpList *hd)
2372 GNUNET_CONTAINER_DLL_remove (mhd_httpd_head,
2375 GNUNET_free_non_null (hd->domain);
2376 MHD_stop_daemon (hd->daemon);
2377 if (NULL != hd->httpd_task)
2379 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2380 hd->httpd_task = NULL;
2382 GNUNET_free_non_null (hd->proxy_cert);
2390 * Task run whenever HTTP server is idle for too long. Kill it.
2392 * @param cls the `struct MhdHttpList *`
2395 kill_httpd_task (void *cls)
2397 struct MhdHttpList *hd = cls;
2399 hd->httpd_task = NULL;
2405 * Task run whenever HTTP server operations are pending.
2407 * @param cls the `struct MhdHttpList *` of the daemon that is being run
2410 do_httpd (void *cls);
2414 * Schedule MHD. This function should be called initially when an
2415 * MHD is first getting its client socket, and will then automatically
2416 * always be called later whenever there is work to be done.
2418 * @param hd the daemon to schedule
2421 schedule_httpd (struct MhdHttpList *hd)
2426 struct GNUNET_NETWORK_FDSet *wrs;
2427 struct GNUNET_NETWORK_FDSet *wws;
2430 MHD_UNSIGNED_LONG_LONG timeout;
2431 struct GNUNET_TIME_Relative tv;
2438 MHD_get_fdset (hd->daemon,
2447 haveto = MHD_get_timeout (hd->daemon,
2449 if (MHD_YES == haveto)
2450 tv.rel_value_us = (uint64_t) timeout * 1000LL;
2452 tv = GNUNET_TIME_UNIT_FOREVER_REL;
2455 wrs = GNUNET_NETWORK_fdset_create ();
2456 wws = GNUNET_NETWORK_fdset_create ();
2457 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
2458 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
2465 if (NULL != hd->httpd_task)
2467 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2468 hd->httpd_task = NULL;
2470 if ( (MHD_YES != haveto) &&
2474 /* daemon is idle, kill after timeout */
2475 hd->httpd_task = GNUNET_SCHEDULER_add_delayed (MHD_CACHE_TIMEOUT,
2482 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2487 GNUNET_NETWORK_fdset_destroy (wrs);
2489 GNUNET_NETWORK_fdset_destroy (wws);
2494 * Task run whenever HTTP server operations are pending.
2496 * @param cls the `struct MhdHttpList` of the daemon that is being run
2499 do_httpd (void *cls)
2501 struct MhdHttpList *hd = cls;
2503 hd->httpd_task = NULL;
2504 MHD_run (hd->daemon);
2505 schedule_httpd (hd);
2510 * Run MHD now, we have extra data ready for the callback.
2512 * @param hd the daemon to run now.
2515 run_mhd_now (struct MhdHttpList *hd)
2517 if (NULL != hd->httpd_task)
2518 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2519 hd->httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd,
2525 * Read file in filename
2527 * @param filename file to read
2528 * @param size pointer where filesize is stored
2529 * @return NULL on error
2532 load_file (const char* filename,
2539 GNUNET_DISK_file_size (filename,
2544 if (fsize > MAX_PEM_SIZE)
2546 *size = (unsigned int) fsize;
2547 buffer = GNUNET_malloc (*size);
2549 GNUNET_DISK_fn_read (filename,
2553 GNUNET_free (buffer);
2561 * Load PEM key from file
2563 * @param key where to store the data
2564 * @param keyfile path to the PEM file
2565 * @return #GNUNET_OK on success
2568 load_key_from_file (gnutls_x509_privkey_t key,
2569 const char* keyfile)
2571 gnutls_datum_t key_data;
2574 key_data.data = load_file (keyfile,
2576 if (NULL == key_data.data)
2577 return GNUNET_SYSERR;
2578 ret = gnutls_x509_privkey_import (key, &key_data,
2579 GNUTLS_X509_FMT_PEM);
2580 if (GNUTLS_E_SUCCESS != ret)
2582 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2583 _("Unable to import private key from file `%s'\n"),
2586 GNUNET_free_non_null (key_data.data);
2587 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2592 * Load cert from file
2594 * @param crt struct to store data in
2595 * @param certfile path to pem file
2596 * @return #GNUNET_OK on success
2599 load_cert_from_file (gnutls_x509_crt_t crt,
2600 const char* certfile)
2602 gnutls_datum_t cert_data;
2605 cert_data.data = load_file (certfile,
2607 if (NULL == cert_data.data)
2608 return GNUNET_SYSERR;
2609 ret = gnutls_x509_crt_import (crt,
2611 GNUTLS_X509_FMT_PEM);
2612 if (GNUTLS_E_SUCCESS != ret)
2614 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2615 _("Unable to import certificate from `%s'\n"),
2618 GNUNET_free_non_null (cert_data.data);
2619 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2624 * Generate new certificate for specific name
2626 * @param name the subject name to generate a cert for
2627 * @return a struct holding the PEM data, NULL on error
2629 static struct ProxyGNSCertificate *
2630 generate_gns_certificate (const char *name)
2632 unsigned int serial;
2633 size_t key_buf_size;
2634 size_t cert_buf_size;
2635 gnutls_x509_crt_t request;
2638 struct ProxyGNSCertificate *pgc;
2640 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2641 "Generating x.509 certificate for `%s'\n",
2643 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_init (&request));
2644 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_key (request, proxy_ca.key));
2645 pgc = GNUNET_new (struct ProxyGNSCertificate);
2646 gnutls_x509_crt_set_dn_by_oid (request,
2647 GNUTLS_OID_X520_COUNTRY_NAME,
2651 gnutls_x509_crt_set_dn_by_oid (request,
2652 GNUTLS_OID_X520_ORGANIZATION_NAME,
2655 strlen ("GNU Name System"));
2656 gnutls_x509_crt_set_dn_by_oid (request,
2657 GNUTLS_OID_X520_COMMON_NAME,
2661 GNUNET_break (GNUTLS_E_SUCCESS ==
2662 gnutls_x509_crt_set_version (request,
2664 gnutls_rnd (GNUTLS_RND_NONCE,
2667 gnutls_x509_crt_set_serial (request,
2670 etime = time (NULL);
2671 tm_data = localtime (&etime);
2673 etime = mktime(tm_data);
2674 gnutls_x509_crt_set_activation_time (request,
2677 etime = mktime (tm_data);
2678 gnutls_x509_crt_set_expiration_time (request,
2680 gnutls_x509_crt_sign2 (request,
2685 key_buf_size = sizeof (pgc->key);
2686 cert_buf_size = sizeof (pgc->cert);
2687 gnutls_x509_crt_export (request,
2688 GNUTLS_X509_FMT_PEM,
2691 gnutls_x509_privkey_export (proxy_ca.key,
2692 GNUTLS_X509_FMT_PEM,
2695 gnutls_x509_crt_deinit (request);
2701 * Function called by MHD with errors, suppresses them all.
2703 * @param cls closure
2704 * @param fm format string (`printf()`-style)
2705 * @param ap arguments to @a fm
2708 mhd_error_log_callback (void *cls,
2717 * Lookup (or create) an TLS MHD instance for a particular domain.
2719 * @param domain the domain the TLS daemon has to serve
2720 * @return NULL on error
2722 static struct MhdHttpList *
2723 lookup_ssl_httpd (const char* domain)
2725 struct MhdHttpList *hd;
2726 struct ProxyGNSCertificate *pgc;
2733 for (hd = mhd_httpd_head; NULL != hd; hd = hd->next)
2734 if ( (NULL != hd->domain) &&
2735 (0 == strcmp (hd->domain, domain)) )
2737 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2738 "Starting fresh MHD HTTPS instance for domain `%s'\n",
2740 pgc = generate_gns_certificate (domain);
2741 hd = GNUNET_new (struct MhdHttpList);
2742 hd->is_ssl = GNUNET_YES;
2743 hd->domain = GNUNET_strdup (domain);
2744 hd->proxy_cert = pgc;
2745 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_SSL | MHD_USE_NO_LISTEN_SOCKET | MHD_ALLOW_SUSPEND_RESUME,
2748 &create_response, hd,
2749 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
2750 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
2751 MHD_OPTION_NOTIFY_CONNECTION, &mhd_connection_cb, NULL,
2752 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
2753 MHD_OPTION_EXTERNAL_LOGGER, &mhd_error_log_callback, NULL,
2754 MHD_OPTION_HTTPS_MEM_KEY, pgc->key,
2755 MHD_OPTION_HTTPS_MEM_CERT, pgc->cert,
2757 if (NULL == hd->daemon)
2763 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
2771 * Task run when a Socks5Request somehow fails to be associated with
2772 * an MHD connection (i.e. because the client never speaks HTTP after
2773 * the SOCKS5 handshake). Clean up.
2775 * @param cls the `struct Socks5Request *`
2778 timeout_s5r_handshake (void *cls)
2780 struct Socks5Request *s5r = cls;
2782 s5r->timeout_task = NULL;
2788 * We're done with the Socks5 protocol, now we need to pass the
2789 * connection data through to the final destination, either
2790 * direct (if the protocol might not be HTTP), or via MHD
2791 * (if the port looks like it should be HTTP).
2793 * @param s5r socks request that has reached the final stage
2796 setup_data_transfer (struct Socks5Request *s5r)
2798 struct MhdHttpList *hd;
2800 const struct sockaddr *addr;
2807 GNUNET_asprintf (&domain,
2810 hd = lookup_ssl_httpd (domain);
2813 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2814 _("Failed to start HTTPS server for `%s'\n"),
2817 GNUNET_free (domain);
2824 GNUNET_assert (NULL != httpd);
2828 fd = GNUNET_NETWORK_get_fd (s5r->sock);
2829 addr = GNUNET_NETWORK_get_addr (s5r->sock);
2830 len = GNUNET_NETWORK_get_addrlen (s5r->sock);
2831 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2833 MHD_add_connection (hd->daemon,
2838 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2839 _("Failed to pass client to MHD\n"));
2841 GNUNET_free_non_null (domain);
2845 schedule_httpd (hd);
2846 s5r->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_HANDSHAKE_TIMEOUT,
2847 &timeout_s5r_handshake,
2849 GNUNET_free_non_null (domain);
2853 /* ********************* SOCKS handling ************************* */
2857 * Write data from buffer to socks5 client, then continue with state machine.
2859 * @param cls the closure with the `struct Socks5Request`
2862 do_write (void *cls)
2864 struct Socks5Request *s5r = cls;
2868 len = GNUNET_NETWORK_socket_send (s5r->sock,
2873 /* write error: connection closed, shutdown, etc.; just clean up */
2874 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2881 s5r->wbuf_len - len);
2882 s5r->wbuf_len -= len;
2883 if (s5r->wbuf_len > 0)
2885 /* not done writing */
2887 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2893 /* we're done writing, continue with state machine! */
2900 case SOCKS5_REQUEST:
2901 GNUNET_assert (NULL != s5r->rtask);
2903 case SOCKS5_DATA_TRANSFER:
2904 setup_data_transfer (s5r);
2906 case SOCKS5_WRITE_THEN_CLEANUP:
2917 * Return a server response message indicating a failure to the client.
2919 * @param s5r request to return failure code for
2920 * @param sc status code to return
2923 signal_socks_failure (struct Socks5Request *s5r,
2924 enum Socks5StatusCode sc)
2926 struct Socks5ServerResponseMessage *s_resp;
2928 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2929 memset (s_resp, 0, sizeof (struct Socks5ServerResponseMessage));
2930 s_resp->version = SOCKS_VERSION_5;
2932 s5r->state = SOCKS5_WRITE_THEN_CLEANUP;
2933 if (NULL != s5r->wtask)
2935 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2942 * Return a server response message indicating success.
2944 * @param s5r request to return success status message for
2947 signal_socks_success (struct Socks5Request *s5r)
2949 struct Socks5ServerResponseMessage *s_resp;
2951 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2952 s_resp->version = SOCKS_VERSION_5;
2953 s_resp->reply = SOCKS5_STATUS_REQUEST_GRANTED;
2954 s_resp->reserved = 0;
2955 s_resp->addr_type = SOCKS5_AT_IPV4;
2956 /* zero out IPv4 address and port */
2959 sizeof (struct in_addr) + sizeof (uint16_t));
2960 s5r->wbuf_len += sizeof (struct Socks5ServerResponseMessage) +
2961 sizeof (struct in_addr) + sizeof (uint16_t);
2962 if (NULL == s5r->wtask)
2964 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2971 * Process GNS results for target domain.
2973 * @param cls the `struct Socks5Request *`
2974 * @param tld #GNUNET_YES if this was a GNS TLD.
2975 * @param rd_count number of records returned
2976 * @param rd record data
2979 handle_gns_result (void *cls,
2982 const struct GNUNET_GNSRECORD_Data *rd)
2984 struct Socks5Request *s5r = cls;
2985 const struct GNUNET_GNSRECORD_Data *r;
2988 s5r->gns_lookup = NULL;
2991 for (uint32_t i=0;i<rd_count;i++)
2994 switch (r->record_type)
2996 case GNUNET_DNSPARSER_TYPE_A:
2998 struct sockaddr_in *in;
3000 if (sizeof (struct in_addr) != r->data_size)
3002 GNUNET_break_op (0);
3005 if (GNUNET_YES == got_ip)
3008 GNUNET_NETWORK_test_pf (PF_INET))
3010 got_ip = GNUNET_YES;
3011 in = (struct sockaddr_in *) &s5r->destination_address;
3012 in->sin_family = AF_INET;
3013 GNUNET_memcpy (&in->sin_addr,
3016 in->sin_port = htons (s5r->port);
3017 #if HAVE_SOCKADDR_IN_SIN_LEN
3018 in->sin_len = sizeof (*in);
3022 case GNUNET_DNSPARSER_TYPE_AAAA:
3024 struct sockaddr_in6 *in;
3026 if (sizeof (struct in6_addr) != r->data_size)
3028 GNUNET_break_op (0);
3031 if (GNUNET_YES == got_ip)
3033 if (GNUNET_YES == disable_v6)
3036 GNUNET_NETWORK_test_pf (PF_INET6))
3038 /* FIXME: allow user to disable IPv6 per configuration option... */
3039 got_ip = GNUNET_YES;
3040 in = (struct sockaddr_in6 *) &s5r->destination_address;
3041 in->sin6_family = AF_INET6;
3042 GNUNET_memcpy (&in->sin6_addr,
3045 in->sin6_port = htons (s5r->port);
3046 #if HAVE_SOCKADDR_IN_SIN_LEN
3047 in->sin6_len = sizeof (*in);
3051 case GNUNET_GNSRECORD_TYPE_VPN:
3052 GNUNET_break (0); /* should have been translated within GNS */
3054 case GNUNET_GNSRECORD_TYPE_LEHO:
3055 GNUNET_free_non_null (s5r->leho);
3056 s5r->leho = GNUNET_strndup (r->data,
3059 case GNUNET_GNSRECORD_TYPE_BOX:
3061 const struct GNUNET_GNSRECORD_BoxRecord *box;
3063 if (r->data_size < sizeof (struct GNUNET_GNSRECORD_BoxRecord))
3065 GNUNET_break_op (0);
3069 if ( (ntohl (box->record_type) != GNUNET_DNSPARSER_TYPE_TLSA) ||
3070 (ntohs (box->protocol) != IPPROTO_TCP) ||
3071 (ntohs (box->service) != s5r->port) )
3072 break; /* BOX record does not apply */
3073 GNUNET_free_non_null (s5r->dane_data);
3074 s5r->dane_data_len = r->data_size - sizeof (struct GNUNET_GNSRECORD_BoxRecord);
3075 s5r->dane_data = GNUNET_malloc (s5r->dane_data_len);
3076 GNUNET_memcpy (s5r->dane_data,
3078 s5r->dane_data_len);
3086 if ( (GNUNET_YES != got_ip) &&
3087 (GNUNET_YES == tld) )
3089 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3090 "Name resolution failed to yield useful IP address.\n");
3091 signal_socks_failure (s5r,
3092 SOCKS5_STATUS_GENERAL_FAILURE);
3095 s5r->state = SOCKS5_DATA_TRANSFER;
3096 signal_socks_success (s5r);
3101 * Remove the first @a len bytes from the beginning of the read buffer.
3103 * @param s5r the handle clear the read buffer for
3104 * @param len number of bytes in read buffer to advance
3107 clear_from_s5r_rbuf (struct Socks5Request *s5r,
3110 GNUNET_assert (len <= s5r->rbuf_len);
3113 s5r->rbuf_len - len);
3114 s5r->rbuf_len -= len;
3119 * Read data from incoming Socks5 connection
3121 * @param cls the closure with the `struct Socks5Request`
3124 do_s5r_read (void *cls)
3126 struct Socks5Request *s5r = cls;
3127 const struct Socks5ClientHelloMessage *c_hello;
3128 struct Socks5ServerHelloMessage *s_hello;
3129 const struct Socks5ClientRequestMessage *c_req;
3132 const struct GNUNET_SCHEDULER_TaskContext *tc;
3135 tc = GNUNET_SCHEDULER_get_task_context ();
3136 if ( (NULL != tc->read_ready) &&
3137 (GNUNET_NETWORK_fdset_isset (tc->read_ready,
3140 rlen = GNUNET_NETWORK_socket_recv (s5r->sock,
3141 &s5r->rbuf[s5r->rbuf_len],
3142 sizeof (s5r->rbuf) - s5r->rbuf_len);
3145 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3146 "socks5 client disconnected.\n");
3150 s5r->rbuf_len += rlen;
3152 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3155 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3156 "Processing %zu bytes of socks data in state %d\n",
3162 c_hello = (const struct Socks5ClientHelloMessage*) &s5r->rbuf;
3163 if ( (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage)) ||
3164 (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods) )
3165 return; /* need more data */
3166 if (SOCKS_VERSION_5 != c_hello->version)
3168 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3169 _("Unsupported socks version %d\n"),
3170 (int) c_hello->version);
3174 clear_from_s5r_rbuf (s5r,
3175 sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods);
3176 GNUNET_assert (0 == s5r->wbuf_len);
3177 s_hello = (struct Socks5ServerHelloMessage *) &s5r->wbuf;
3178 s5r->wbuf_len = sizeof (struct Socks5ServerHelloMessage);
3179 s_hello->version = SOCKS_VERSION_5;
3180 s_hello->auth_method = SOCKS_AUTH_NONE;
3181 GNUNET_assert (NULL == s5r->wtask);
3182 s5r->wtask = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
3185 s5r->state = SOCKS5_REQUEST;
3187 case SOCKS5_REQUEST:
3188 c_req = (const struct Socks5ClientRequestMessage *) &s5r->rbuf;
3189 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage))
3191 switch (c_req->command)
3193 case SOCKS5_CMD_TCP_STREAM:
3197 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3198 _("Unsupported socks command %d\n"),
3199 (int) c_req->command);
3200 signal_socks_failure (s5r,
3201 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED);
3204 switch (c_req->addr_type)
3206 case SOCKS5_AT_IPV4:
3208 const struct in_addr *v4 = (const struct in_addr *) &c_req[1];
3209 const uint16_t *port = (const uint16_t *) &v4[1];
3210 struct sockaddr_in *in;
3212 s5r->port = ntohs (*port);
3213 alen = sizeof (struct in_addr);
3214 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
3215 alen + sizeof (uint16_t))
3216 return; /* need more data */
3217 in = (struct sockaddr_in *) &s5r->destination_address;
3218 in->sin_family = AF_INET;
3220 in->sin_port = *port;
3221 #if HAVE_SOCKADDR_IN_SIN_LEN
3222 in->sin_len = sizeof (*in);
3224 s5r->state = SOCKS5_DATA_TRANSFER;
3227 case SOCKS5_AT_IPV6:
3229 const struct in6_addr *v6 = (const struct in6_addr *) &c_req[1];
3230 const uint16_t *port = (const uint16_t *) &v6[1];
3231 struct sockaddr_in6 *in;
3233 s5r->port = ntohs (*port);
3234 alen = sizeof (struct in6_addr);
3235 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
3236 alen + sizeof (uint16_t))
3237 return; /* need more data */
3238 in = (struct sockaddr_in6 *) &s5r->destination_address;
3239 in->sin6_family = AF_INET6;
3240 in->sin6_addr = *v6;
3241 in->sin6_port = *port;
3242 #if HAVE_SOCKADDR_IN_SIN_LEN
3243 in->sin6_len = sizeof (*in);
3245 s5r->state = SOCKS5_DATA_TRANSFER;
3248 case SOCKS5_AT_DOMAINNAME:
3250 const uint8_t *dom_len;
3251 const char *dom_name;
3252 const uint16_t *port;
3254 dom_len = (const uint8_t *) &c_req[1];
3255 alen = *dom_len + 1;
3256 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
3257 alen + sizeof (uint16_t))
3258 return; /* need more data */
3259 dom_name = (const char *) &dom_len[1];
3260 port = (const uint16_t*) &dom_name[*dom_len];
3261 s5r->domain = GNUNET_strndup (dom_name,
3263 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3264 "Requested connection is to http%s://%s:%d\n",
3265 (HTTPS_PORT == s5r->port) ? "s" : "",
3268 s5r->state = SOCKS5_RESOLVING;
3269 s5r->port = ntohs (*port);
3270 s5r->gns_lookup = GNUNET_GNS_lookup_with_tld (gns_handle,
3272 GNUNET_DNSPARSER_TYPE_A,
3273 GNUNET_NO /* only cached */,
3279 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3280 _("Unsupported socks address type %d\n"),
3281 (int) c_req->addr_type);
3282 signal_socks_failure (s5r,
3283 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED);
3286 clear_from_s5r_rbuf (s5r,
3287 sizeof (struct Socks5ClientRequestMessage) +
3288 alen + sizeof (uint16_t));
3289 if (0 != s5r->rbuf_len)
3291 /* read more bytes than healthy, why did the client send more!? */
3292 GNUNET_break_op (0);
3293 signal_socks_failure (s5r,
3294 SOCKS5_STATUS_GENERAL_FAILURE);
3297 if (SOCKS5_DATA_TRANSFER == s5r->state)
3299 /* if we are not waiting for GNS resolution, signal success */
3300 signal_socks_success (s5r);
3302 /* We are done reading right now */
3303 GNUNET_SCHEDULER_cancel (s5r->rtask);
3306 case SOCKS5_RESOLVING:
3309 case SOCKS5_DATA_TRANSFER:
3320 * Accept new incoming connections
3322 * @param cls the closure with the lsock4 or lsock6
3323 * @param tc the scheduler context
3326 do_accept (void *cls)
3328 struct GNUNET_NETWORK_Handle *lsock = cls;
3329 struct GNUNET_NETWORK_Handle *s;
3330 struct Socks5Request *s5r;
3332 GNUNET_assert (NULL != lsock);
3333 if (lsock == lsock4)
3334 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3338 else if (lsock == lsock6)
3339 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3345 s = GNUNET_NETWORK_socket_accept (lsock,
3350 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3354 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3355 "Got an inbound connection, waiting for data\n");
3356 s5r = GNUNET_new (struct Socks5Request);
3357 GNUNET_CONTAINER_DLL_insert (s5r_head,
3361 s5r->state = SOCKS5_INIT;
3362 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3369 /* ******************* General / main code ********************* */
3373 * Task run on shutdown
3375 * @param cls closure
3378 do_shutdown (void *cls)
3380 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3381 "Shutting down...\n");
3382 /* MHD requires resuming before destroying the daemons */
3383 for (struct Socks5Request *s5r = s5r_head;
3389 s5r->suspended = GNUNET_NO;
3390 MHD_resume_connection (s5r->con);
3393 while (NULL != mhd_httpd_head)
3394 kill_httpd (mhd_httpd_head);
3395 while (NULL != s5r_head)
3396 cleanup_s5r (s5r_head);
3399 GNUNET_NETWORK_socket_close (lsock4);
3404 GNUNET_NETWORK_socket_close (lsock6);
3407 if (NULL != curl_multi)
3409 curl_multi_cleanup (curl_multi);
3412 if (NULL != gns_handle)
3414 GNUNET_GNS_disconnect (gns_handle);
3417 if (NULL != curl_download_task)
3419 GNUNET_SCHEDULER_cancel (curl_download_task);
3420 curl_download_task = NULL;
3424 GNUNET_SCHEDULER_cancel (ltask4);
3429 GNUNET_SCHEDULER_cancel (ltask6);
3432 gnutls_x509_crt_deinit (proxy_ca.cert);
3433 gnutls_x509_privkey_deinit (proxy_ca.key);
3434 gnutls_global_deinit ();
3439 * Create an IPv4 listen socket bound to our port.
3441 * @return NULL on error
3443 static struct GNUNET_NETWORK_Handle *
3446 struct GNUNET_NETWORK_Handle *ls;
3447 struct sockaddr_in sa4;
3450 memset (&sa4, 0, sizeof (sa4));
3451 sa4.sin_family = AF_INET;
3452 sa4.sin_port = htons (port);
3453 #if HAVE_SOCKADDR_IN_SIN_LEN
3454 sa4.sin_len = sizeof (sa4);
3456 ls = GNUNET_NETWORK_socket_create (AF_INET,
3462 GNUNET_NETWORK_socket_bind (ls,
3463 (const struct sockaddr *) &sa4,
3467 GNUNET_NETWORK_socket_close (ls);
3476 * Create an IPv6 listen socket bound to our port.
3478 * @return NULL on error
3480 static struct GNUNET_NETWORK_Handle *
3483 struct GNUNET_NETWORK_Handle *ls;
3484 struct sockaddr_in6 sa6;
3487 memset (&sa6, 0, sizeof (sa6));
3488 sa6.sin6_family = AF_INET6;
3489 sa6.sin6_port = htons (port);
3490 #if HAVE_SOCKADDR_IN_SIN_LEN
3491 sa6.sin6_len = sizeof (sa6);
3493 ls = GNUNET_NETWORK_socket_create (AF_INET6,
3499 GNUNET_NETWORK_socket_bind (ls,
3500 (const struct sockaddr *) &sa6,
3504 GNUNET_NETWORK_socket_close (ls);
3513 * Main function that will be run
3515 * @param cls closure
3516 * @param args remaining command-line arguments
3517 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
3518 * @param c configuration
3523 const char *cfgfile,
3524 const struct GNUNET_CONFIGURATION_Handle *c)
3526 char* cafile_cfg = NULL;
3528 struct MhdHttpList *hd;
3532 if (NULL == (curl_multi = curl_multi_init ()))
3534 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3535 "Failed to create cURL multi handle!\n");
3538 cafile = cafile_opt;
3542 GNUNET_CONFIGURATION_get_value_filename (cfg,
3547 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
3552 cafile = cafile_cfg;
3554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3555 "Using `%s' as CA\n",
3558 gnutls_global_init ();
3559 gnutls_x509_crt_init (&proxy_ca.cert);
3560 gnutls_x509_privkey_init (&proxy_ca.key);
3563 load_cert_from_file (proxy_ca.cert,
3566 load_key_from_file (proxy_ca.key,
3569 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3570 _("Failed to load X.509 key and certificate from `%s'\n"),
3572 gnutls_x509_crt_deinit (proxy_ca.cert);
3573 gnutls_x509_privkey_deinit (proxy_ca.key);
3574 gnutls_global_deinit ();
3575 GNUNET_free_non_null (cafile_cfg);
3578 GNUNET_free_non_null (cafile_cfg);
3579 if (NULL == (gns_handle = GNUNET_GNS_connect (cfg)))
3581 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3582 "Unable to connect to GNS!\n");
3583 gnutls_x509_crt_deinit (proxy_ca.cert);
3584 gnutls_x509_privkey_deinit (proxy_ca.key);
3585 gnutls_global_deinit ();
3588 GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
3591 /* Open listen socket for socks proxy */
3592 lsock6 = bind_v6 ();
3595 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3601 GNUNET_NETWORK_socket_listen (lsock6,
3604 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3606 GNUNET_NETWORK_socket_close (lsock6);
3611 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3617 lsock4 = bind_v4 ();
3620 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3626 GNUNET_NETWORK_socket_listen (lsock4,
3629 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3631 GNUNET_NETWORK_socket_close (lsock4);
3636 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3642 if ( (NULL == lsock4) &&
3645 GNUNET_SCHEDULER_shutdown ();
3648 if (0 != curl_global_init (CURL_GLOBAL_WIN32))
3650 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3651 "cURL global init failed!\n");
3652 GNUNET_SCHEDULER_shutdown ();
3655 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3656 "Proxy listens on port %u\n",
3657 (unsigned int) port);
3659 /* start MHD daemon for HTTP */
3660 hd = GNUNET_new (struct MhdHttpList);
3661 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_NO_LISTEN_SOCKET | MHD_ALLOW_SUSPEND_RESUME,
3664 &create_response, hd,
3665 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
3666 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
3667 MHD_OPTION_NOTIFY_CONNECTION, &mhd_connection_cb, NULL,
3668 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
3670 if (NULL == hd->daemon)
3673 GNUNET_SCHEDULER_shutdown ();
3677 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
3684 * The main function for gnunet-gns-proxy.
3686 * @param argc number of arguments from the command line
3687 * @param argv command line arguments
3688 * @return 0 ok, 1 on error
3694 struct GNUNET_GETOPT_CommandLineOption options[] = {
3695 GNUNET_GETOPT_option_uint16 ('p',
3698 gettext_noop ("listen on specified port (default: 7777)"),
3700 GNUNET_GETOPT_option_string ('a',
3703 gettext_noop ("pem file to use as CA"),
3705 GNUNET_GETOPT_option_flag ('6',
3707 gettext_noop ("disable use of IPv6"),
3710 GNUNET_GETOPT_OPTION_END
3712 static const char* page =
3713 "<html><head><title>gnunet-gns-proxy</title>"
3714 "</head><body>cURL fail</body></html>";
3718 GNUNET_STRINGS_get_utf8_args (argc, argv,
3721 GNUNET_log_setup ("gnunet-gns-proxy",
3724 curl_failure_response
3725 = MHD_create_response_from_buffer (strlen (page),
3727 MHD_RESPMEM_PERSISTENT);
3731 GNUNET_PROGRAM_run (argc, argv,
3733 _("GNUnet GNS proxy"),
3735 &run, NULL)) ? 0 : 1;
3736 MHD_destroy_response (curl_failure_response);
3737 GNUNET_free_non_null ((char *) argv);
3741 /* end of gnunet-gns-proxy.c */