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 if (0 == strcasecmp (MHD_HTTP_HEADER_CONTENT_LENGTH,
1728 if (0 == strcasecmp (MHD_HTTP_HEADER_ACCEPT_ENCODING,
1731 GNUNET_asprintf (&hdr,
1735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1736 "Adding HEADER `%s' to HTTP request\n",
1738 s5r->headers = curl_slist_append (s5r->headers,
1746 * Main MHD callback for handling requests.
1749 * @param con MHD connection handle
1750 * @param url the url in the request
1751 * @param meth the HTTP method used ("GET", "PUT", etc.)
1752 * @param ver the HTTP version string (i.e. "HTTP/1.1")
1753 * @param upload_data the data being uploaded (excluding HEADERS,
1754 * for a POST that fits into memory and that is encoded
1755 * with a supported encoding, the POST data will NOT be
1756 * given in upload_data and is instead available as
1757 * part of MHD_get_connection_values; very large POST
1758 * data *will* be made available incrementally in
1760 * @param upload_data_size set initially to the size of the
1761 * @a upload_data provided; the method must update this
1762 * value to the number of bytes NOT processed;
1763 * @param con_cls pointer to location where we store the `struct Request`
1764 * @return #MHD_YES if the connection was handled successfully,
1765 * #MHD_NO if the socket must be closed due to a serious
1766 * error while handling the request
1769 create_response (void *cls,
1770 struct MHD_Connection *con,
1774 const char *upload_data,
1775 size_t *upload_data_size,
1778 struct Socks5Request *s5r = *con_cls;
1780 char ipstring[INET6_ADDRSTRLEN];
1781 char ipaddr[INET6_ADDRSTRLEN + 2];
1782 const struct sockaddr *sa;
1783 const struct sockaddr_in *s4;
1784 const struct sockaddr_in6 *s6;
1794 /* Fresh connection. */
1795 if (SOCKS5_SOCKET_WITH_MHD == s5r->state)
1797 /* first time here, initialize curl handle */
1800 sa = (const struct sockaddr *) &s5r->destination_address;
1801 switch (sa->sa_family)
1804 s4 = (const struct sockaddr_in *) &s5r->destination_address;
1805 if (NULL == inet_ntop (AF_INET,
1813 GNUNET_snprintf (ipaddr,
1817 port = ntohs (s4->sin_port);
1820 s6 = (const struct sockaddr_in6 *) &s5r->destination_address;
1821 if (NULL == inet_ntop (AF_INET6,
1829 GNUNET_snprintf (ipaddr,
1833 port = ntohs (s6->sin6_port);
1844 if (NULL == s5r->curl)
1845 s5r->curl = curl_easy_init ();
1846 if (NULL == s5r->curl)
1847 return MHD_queue_response (con,
1848 MHD_HTTP_INTERNAL_SERVER_ERROR,
1849 curl_failure_response);
1850 curl_easy_setopt (s5r->curl,
1851 CURLOPT_HEADERFUNCTION,
1853 curl_easy_setopt (s5r->curl,
1856 curl_easy_setopt (s5r->curl,
1857 CURLOPT_FOLLOWLOCATION,
1860 curl_easy_setopt (s5r->curl,
1863 curl_easy_setopt (s5r->curl,
1864 CURLOPT_CONNECTTIMEOUT,
1866 curl_easy_setopt (s5r->curl,
1869 curl_easy_setopt (s5r->curl,
1872 curl_easy_setopt (s5r->curl,
1873 CURLOPT_HTTP_CONTENT_DECODING,
1875 curl_easy_setopt (s5r->curl,
1878 curl_easy_setopt (s5r->curl,
1881 curl_easy_setopt (s5r->curl,
1885 * Pre-populate cache to resolve Hostname.
1886 * This is necessary as the DNS name in the CURLOPT_URL is used
1887 * for SNI http://de.wikipedia.org/wiki/Server_Name_Indication
1889 if (NULL != s5r->leho)
1893 GNUNET_asprintf (&curl_hosts,
1898 s5r->hosts = curl_slist_append (NULL,
1900 curl_easy_setopt (s5r->curl,
1903 GNUNET_free (curl_hosts);
1907 GNUNET_asprintf (&curlurl,
1908 (HTTPS_PORT != s5r->port)
1910 : "https://%s:%d%s",
1919 GNUNET_asprintf (&curlurl,
1920 (HTTPS_PORT != s5r->port)
1922 : "https://%s:%d%s",
1927 curl_easy_setopt (s5r->curl,
1930 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1931 "Launching %s CURL interaction, fetching `%s'\n",
1932 (s5r->is_gns) ? "GNS" : "DNS",
1934 GNUNET_free (curlurl);
1935 if (0 == strcasecmp (meth,
1936 MHD_HTTP_METHOD_PUT))
1938 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1939 curl_easy_setopt (s5r->curl,
1942 curl_easy_setopt (s5r->curl,
1943 CURLOPT_WRITEFUNCTION,
1945 curl_easy_setopt (s5r->curl,
1948 GNUNET_assert (CURLE_OK ==
1949 curl_easy_setopt (s5r->curl,
1950 CURLOPT_READFUNCTION,
1952 curl_easy_setopt (s5r->curl,
1959 us = MHD_lookup_connection_value (con,
1961 MHD_HTTP_HEADER_CONTENT_LENGTH);
1962 if ( (1 == sscanf (us,
1965 (upload_size >= 0) )
1967 curl_easy_setopt (s5r->curl,
1973 else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_POST))
1975 s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
1976 curl_easy_setopt (s5r->curl,
1979 curl_easy_setopt (s5r->curl,
1980 CURLOPT_WRITEFUNCTION,
1982 curl_easy_setopt (s5r->curl,
1985 curl_easy_setopt (s5r->curl,
1986 CURLOPT_READFUNCTION,
1988 curl_easy_setopt (s5r->curl,
1995 us = MHD_lookup_connection_value (con,
1997 MHD_HTTP_HEADER_CONTENT_LENGTH);
1998 if ( (NULL != us) &&
2002 (upload_size >= 0) )
2004 curl_easy_setopt (s5r->curl,
2008 curl_easy_setopt (s5r->curl,
2014 else if (0 == strcasecmp (meth,
2015 MHD_HTTP_METHOD_HEAD))
2017 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2018 curl_easy_setopt (s5r->curl,
2022 else if (0 == strcasecmp (meth,
2023 MHD_HTTP_METHOD_OPTIONS))
2025 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2026 curl_easy_setopt (s5r->curl,
2027 CURLOPT_CUSTOMREQUEST,
2030 else if (0 == strcasecmp (meth,
2031 MHD_HTTP_METHOD_GET))
2033 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2034 curl_easy_setopt (s5r->curl,
2037 curl_easy_setopt (s5r->curl,
2038 CURLOPT_WRITEFUNCTION,
2040 curl_easy_setopt (s5r->curl,
2044 else if (0 == strcasecmp (meth,
2045 MHD_HTTP_METHOD_DELETE))
2047 s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
2048 curl_easy_setopt (s5r->curl,
2049 CURLOPT_CUSTOMREQUEST,
2051 curl_easy_setopt (s5r->curl,
2052 CURLOPT_WRITEFUNCTION,
2054 curl_easy_setopt (s5r->curl,
2060 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2061 _("Unsupported HTTP method `%s'\n"),
2063 curl_easy_cleanup (s5r->curl);
2068 if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_0))
2070 curl_easy_setopt (s5r->curl,
2071 CURLOPT_HTTP_VERSION,
2072 CURL_HTTP_VERSION_1_0);
2074 else if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_1))
2076 curl_easy_setopt (s5r->curl,
2077 CURLOPT_HTTP_VERSION,
2078 CURL_HTTP_VERSION_1_1);
2082 curl_easy_setopt (s5r->curl,
2083 CURLOPT_HTTP_VERSION,
2084 CURL_HTTP_VERSION_NONE);
2087 if (HTTPS_PORT == s5r->port)
2089 curl_easy_setopt (s5r->curl,
2092 if (NULL != s5r->dane_data)
2093 curl_easy_setopt (s5r->curl,
2094 CURLOPT_SSL_VERIFYPEER,
2097 curl_easy_setopt (s5r->curl,
2098 CURLOPT_SSL_VERIFYPEER,
2100 /* Disable cURL checking the hostname, as we will check ourselves
2101 as only we have the domain name or the LEHO or the DANE record */
2102 curl_easy_setopt (s5r->curl,
2103 CURLOPT_SSL_VERIFYHOST,
2108 curl_easy_setopt (s5r->curl,
2114 curl_multi_add_handle (curl_multi,
2118 curl_easy_cleanup (s5r->curl);
2122 MHD_get_connection_values (con,
2126 curl_easy_setopt (s5r->curl,
2129 curl_download_prepare ();
2133 /* continuing to process request */
2134 if (0 != *upload_data_size)
2136 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2137 "Processing %u bytes UPLOAD\n",
2138 (unsigned int) *upload_data_size);
2140 /* FIXME: This must be set or a header with Transfer-Encoding: chunked. Else
2141 * upload callback is not called!
2143 curl_easy_setopt (s5r->curl,
2144 CURLOPT_POSTFIELDSIZE,
2147 left = GNUNET_MIN (*upload_data_size,
2148 sizeof (s5r->io_buf) - s5r->io_len);
2149 GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
2152 s5r->io_len += left;
2153 *upload_data_size -= left;
2154 GNUNET_assert (NULL != s5r->curl);
2155 if (GNUNET_YES == s5r->curl_paused)
2157 s5r->curl_paused = GNUNET_NO;
2158 curl_easy_pause (s5r->curl,
2163 if (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state)
2165 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2166 "Finished processing UPLOAD\n");
2167 s5r->state = SOCKS5_SOCKET_UPLOAD_DONE;
2169 if (NULL == s5r->response)
2171 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2172 "Waiting for HTTP response for %s%s...\n",
2175 MHD_suspend_connection (con);
2176 s5r->suspended = GNUNET_YES;
2179 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2180 "Queueing response for %s%s with MHD\n",
2183 run_mhd_now (s5r->hd);
2184 return MHD_queue_response (con,
2190 /* ******************** MHD HTTP setup and event loop ******************** */
2194 * Function called when MHD decides that we are done with a request.
2197 * @param connection connection handle
2198 * @param con_cls value as set by the last call to
2199 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
2200 * @param toe reason for request termination (ignored)
2203 mhd_completed_cb (void *cls,
2204 struct MHD_Connection *connection,
2206 enum MHD_RequestTerminationCode toe)
2208 struct Socks5Request *s5r = *con_cls;
2212 if (MHD_REQUEST_TERMINATED_COMPLETED_OK != toe)
2213 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2214 "MHD encountered error handling request: %d\n",
2216 if (NULL != s5r->curl)
2218 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2219 "Removing cURL handle (MHD interaction complete)\n");
2220 curl_multi_remove_handle (curl_multi,
2222 curl_slist_free_all (s5r->headers);
2223 s5r->headers = NULL;
2224 curl_easy_reset (s5r->curl);
2228 curl_download_prepare ();
2230 if ( (NULL != s5r->response) &&
2231 (curl_failure_response != s5r->response) )
2232 MHD_destroy_response (s5r->response);
2233 for (struct HttpResponseHeader *header = s5r->header_head;
2235 header = s5r->header_head)
2237 GNUNET_CONTAINER_DLL_remove (s5r->header_head,
2240 GNUNET_free (header->type);
2241 GNUNET_free (header->value);
2242 GNUNET_free (header);
2244 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2245 "Finished request for %s\n",
2247 GNUNET_free (s5r->url);
2248 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2250 s5r->response = NULL;
2256 * Function called when MHD connection is opened or closed.
2259 * @param connection connection handle
2260 * @param con_cls value as set by the last call to
2261 * the MHD_AccessHandlerCallback, should be our `struct Socks5Request *`
2262 * @param toe connection notification type
2265 mhd_connection_cb (void *cls,
2266 struct MHD_Connection *connection,
2268 enum MHD_ConnectionNotificationCode cnc)
2270 struct Socks5Request *s5r;
2271 const union MHD_ConnectionInfo *ci;
2276 case MHD_CONNECTION_NOTIFY_STARTED:
2277 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection started...\n");
2278 ci = MHD_get_connection_info (connection,
2279 MHD_CONNECTION_INFO_CONNECTION_FD);
2285 sock = ci->connect_fd;
2286 for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
2288 if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
2290 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2291 "Context set...\n");
2292 s5r->ssl_checked = GNUNET_NO;
2298 case MHD_CONNECTION_NOTIFY_CLOSED:
2299 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2300 "Connection closed... cleaning up\n");
2304 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2305 "Connection stale!\n");
2309 curl_download_prepare ();
2318 * Function called when MHD first processes an incoming connection.
2319 * Gives us the respective URI information.
2321 * We use this to associate the `struct MHD_Connection` with our
2322 * internal `struct Socks5Request` data structure (by checking
2323 * for matching sockets).
2325 * @param cls the HTTP server handle (a `struct MhdHttpList`)
2326 * @param url the URL that is being requested
2327 * @param connection MHD connection object for the request
2328 * @return the `struct Socks5Request` that this @a connection is for
2331 mhd_log_callback (void *cls,
2333 struct MHD_Connection *connection)
2335 struct Socks5Request *s5r;
2336 const union MHD_ConnectionInfo *ci;
2338 ci = MHD_get_connection_info (connection,
2339 MHD_CONNECTION_INFO_SOCKET_CONTEXT);
2340 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Processing %s\n", url);
2346 s5r = ci->socket_context;
2347 if (NULL != s5r->url)
2352 s5r->url = GNUNET_strdup (url);
2353 if (NULL != s5r->timeout_task)
2355 GNUNET_SCHEDULER_cancel (s5r->timeout_task);
2356 s5r->timeout_task = NULL;
2358 GNUNET_assert (s5r->state == SOCKS5_SOCKET_WITH_MHD);
2364 * Kill the given MHD daemon.
2366 * @param hd daemon to stop
2369 kill_httpd (struct MhdHttpList *hd)
2371 GNUNET_CONTAINER_DLL_remove (mhd_httpd_head,
2374 GNUNET_free_non_null (hd->domain);
2375 MHD_stop_daemon (hd->daemon);
2376 if (NULL != hd->httpd_task)
2378 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2379 hd->httpd_task = NULL;
2381 GNUNET_free_non_null (hd->proxy_cert);
2389 * Task run whenever HTTP server is idle for too long. Kill it.
2391 * @param cls the `struct MhdHttpList *`
2394 kill_httpd_task (void *cls)
2396 struct MhdHttpList *hd = cls;
2398 hd->httpd_task = NULL;
2404 * Task run whenever HTTP server operations are pending.
2406 * @param cls the `struct MhdHttpList *` of the daemon that is being run
2409 do_httpd (void *cls);
2413 * Schedule MHD. This function should be called initially when an
2414 * MHD is first getting its client socket, and will then automatically
2415 * always be called later whenever there is work to be done.
2417 * @param hd the daemon to schedule
2420 schedule_httpd (struct MhdHttpList *hd)
2425 struct GNUNET_NETWORK_FDSet *wrs;
2426 struct GNUNET_NETWORK_FDSet *wws;
2429 MHD_UNSIGNED_LONG_LONG timeout;
2430 struct GNUNET_TIME_Relative tv;
2437 MHD_get_fdset (hd->daemon,
2446 haveto = MHD_get_timeout (hd->daemon,
2448 if (MHD_YES == haveto)
2449 tv.rel_value_us = (uint64_t) timeout * 1000LL;
2451 tv = GNUNET_TIME_UNIT_FOREVER_REL;
2454 wrs = GNUNET_NETWORK_fdset_create ();
2455 wws = GNUNET_NETWORK_fdset_create ();
2456 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
2457 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
2464 if (NULL != hd->httpd_task)
2466 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2467 hd->httpd_task = NULL;
2469 if ( (MHD_YES != haveto) &&
2473 /* daemon is idle, kill after timeout */
2474 hd->httpd_task = GNUNET_SCHEDULER_add_delayed (MHD_CACHE_TIMEOUT,
2481 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2486 GNUNET_NETWORK_fdset_destroy (wrs);
2488 GNUNET_NETWORK_fdset_destroy (wws);
2493 * Task run whenever HTTP server operations are pending.
2495 * @param cls the `struct MhdHttpList` of the daemon that is being run
2498 do_httpd (void *cls)
2500 struct MhdHttpList *hd = cls;
2502 hd->httpd_task = NULL;
2503 MHD_run (hd->daemon);
2504 schedule_httpd (hd);
2509 * Run MHD now, we have extra data ready for the callback.
2511 * @param hd the daemon to run now.
2514 run_mhd_now (struct MhdHttpList *hd)
2516 if (NULL != hd->httpd_task)
2517 GNUNET_SCHEDULER_cancel (hd->httpd_task);
2518 hd->httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd,
2524 * Read file in filename
2526 * @param filename file to read
2527 * @param size pointer where filesize is stored
2528 * @return NULL on error
2531 load_file (const char* filename,
2538 GNUNET_DISK_file_size (filename,
2543 if (fsize > MAX_PEM_SIZE)
2545 *size = (unsigned int) fsize;
2546 buffer = GNUNET_malloc (*size);
2548 GNUNET_DISK_fn_read (filename,
2552 GNUNET_free (buffer);
2560 * Load PEM key from file
2562 * @param key where to store the data
2563 * @param keyfile path to the PEM file
2564 * @return #GNUNET_OK on success
2567 load_key_from_file (gnutls_x509_privkey_t key,
2568 const char* keyfile)
2570 gnutls_datum_t key_data;
2573 key_data.data = load_file (keyfile,
2575 if (NULL == key_data.data)
2576 return GNUNET_SYSERR;
2577 ret = gnutls_x509_privkey_import (key, &key_data,
2578 GNUTLS_X509_FMT_PEM);
2579 if (GNUTLS_E_SUCCESS != ret)
2581 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2582 _("Unable to import private key from file `%s'\n"),
2585 GNUNET_free_non_null (key_data.data);
2586 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2591 * Load cert from file
2593 * @param crt struct to store data in
2594 * @param certfile path to pem file
2595 * @return #GNUNET_OK on success
2598 load_cert_from_file (gnutls_x509_crt_t crt,
2599 const char* certfile)
2601 gnutls_datum_t cert_data;
2604 cert_data.data = load_file (certfile,
2606 if (NULL == cert_data.data)
2607 return GNUNET_SYSERR;
2608 ret = gnutls_x509_crt_import (crt,
2610 GNUTLS_X509_FMT_PEM);
2611 if (GNUTLS_E_SUCCESS != ret)
2613 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2614 _("Unable to import certificate from `%s'\n"),
2617 GNUNET_free_non_null (cert_data.data);
2618 return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
2623 * Generate new certificate for specific name
2625 * @param name the subject name to generate a cert for
2626 * @return a struct holding the PEM data, NULL on error
2628 static struct ProxyGNSCertificate *
2629 generate_gns_certificate (const char *name)
2631 unsigned int serial;
2632 size_t key_buf_size;
2633 size_t cert_buf_size;
2634 gnutls_x509_crt_t request;
2637 struct ProxyGNSCertificate *pgc;
2639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2640 "Generating x.509 certificate for `%s'\n",
2642 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_init (&request));
2643 GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_key (request, proxy_ca.key));
2644 pgc = GNUNET_new (struct ProxyGNSCertificate);
2645 gnutls_x509_crt_set_dn_by_oid (request,
2646 GNUTLS_OID_X520_COUNTRY_NAME,
2650 gnutls_x509_crt_set_dn_by_oid (request,
2651 GNUTLS_OID_X520_ORGANIZATION_NAME,
2654 strlen ("GNU Name System"));
2655 gnutls_x509_crt_set_dn_by_oid (request,
2656 GNUTLS_OID_X520_COMMON_NAME,
2660 GNUNET_break (GNUTLS_E_SUCCESS ==
2661 gnutls_x509_crt_set_version (request,
2663 gnutls_rnd (GNUTLS_RND_NONCE,
2666 gnutls_x509_crt_set_serial (request,
2669 etime = time (NULL);
2670 tm_data = localtime (&etime);
2672 etime = mktime(tm_data);
2673 gnutls_x509_crt_set_activation_time (request,
2676 etime = mktime (tm_data);
2677 gnutls_x509_crt_set_expiration_time (request,
2679 gnutls_x509_crt_sign2 (request,
2684 key_buf_size = sizeof (pgc->key);
2685 cert_buf_size = sizeof (pgc->cert);
2686 gnutls_x509_crt_export (request,
2687 GNUTLS_X509_FMT_PEM,
2690 gnutls_x509_privkey_export (proxy_ca.key,
2691 GNUTLS_X509_FMT_PEM,
2694 gnutls_x509_crt_deinit (request);
2700 * Function called by MHD with errors, suppresses them all.
2702 * @param cls closure
2703 * @param fm format string (`printf()`-style)
2704 * @param ap arguments to @a fm
2707 mhd_error_log_callback (void *cls,
2716 * Lookup (or create) an TLS MHD instance for a particular domain.
2718 * @param domain the domain the TLS daemon has to serve
2719 * @return NULL on error
2721 static struct MhdHttpList *
2722 lookup_ssl_httpd (const char* domain)
2724 struct MhdHttpList *hd;
2725 struct ProxyGNSCertificate *pgc;
2732 for (hd = mhd_httpd_head; NULL != hd; hd = hd->next)
2733 if ( (NULL != hd->domain) &&
2734 (0 == strcmp (hd->domain, domain)) )
2736 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2737 "Starting fresh MHD HTTPS instance for domain `%s'\n",
2739 pgc = generate_gns_certificate (domain);
2740 hd = GNUNET_new (struct MhdHttpList);
2741 hd->is_ssl = GNUNET_YES;
2742 hd->domain = GNUNET_strdup (domain);
2743 hd->proxy_cert = pgc;
2744 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_SSL | MHD_USE_NO_LISTEN_SOCKET | MHD_ALLOW_SUSPEND_RESUME,
2747 &create_response, hd,
2748 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
2749 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
2750 MHD_OPTION_NOTIFY_CONNECTION, &mhd_connection_cb, NULL,
2751 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
2752 MHD_OPTION_EXTERNAL_LOGGER, &mhd_error_log_callback, NULL,
2753 MHD_OPTION_HTTPS_MEM_KEY, pgc->key,
2754 MHD_OPTION_HTTPS_MEM_CERT, pgc->cert,
2756 if (NULL == hd->daemon)
2762 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
2770 * Task run when a Socks5Request somehow fails to be associated with
2771 * an MHD connection (i.e. because the client never speaks HTTP after
2772 * the SOCKS5 handshake). Clean up.
2774 * @param cls the `struct Socks5Request *`
2777 timeout_s5r_handshake (void *cls)
2779 struct Socks5Request *s5r = cls;
2781 s5r->timeout_task = NULL;
2787 * We're done with the Socks5 protocol, now we need to pass the
2788 * connection data through to the final destination, either
2789 * direct (if the protocol might not be HTTP), or via MHD
2790 * (if the port looks like it should be HTTP).
2792 * @param s5r socks request that has reached the final stage
2795 setup_data_transfer (struct Socks5Request *s5r)
2797 struct MhdHttpList *hd;
2799 const struct sockaddr *addr;
2806 GNUNET_asprintf (&domain,
2809 hd = lookup_ssl_httpd (domain);
2812 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2813 _("Failed to start HTTPS server for `%s'\n"),
2816 GNUNET_free (domain);
2823 GNUNET_assert (NULL != httpd);
2827 fd = GNUNET_NETWORK_get_fd (s5r->sock);
2828 addr = GNUNET_NETWORK_get_addr (s5r->sock);
2829 len = GNUNET_NETWORK_get_addrlen (s5r->sock);
2830 s5r->state = SOCKS5_SOCKET_WITH_MHD;
2832 MHD_add_connection (hd->daemon,
2837 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2838 _("Failed to pass client to MHD\n"));
2840 GNUNET_free_non_null (domain);
2844 schedule_httpd (hd);
2845 s5r->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_HANDSHAKE_TIMEOUT,
2846 &timeout_s5r_handshake,
2848 GNUNET_free_non_null (domain);
2852 /* ********************* SOCKS handling ************************* */
2856 * Write data from buffer to socks5 client, then continue with state machine.
2858 * @param cls the closure with the `struct Socks5Request`
2861 do_write (void *cls)
2863 struct Socks5Request *s5r = cls;
2867 len = GNUNET_NETWORK_socket_send (s5r->sock,
2872 /* write error: connection closed, shutdown, etc.; just clean up */
2873 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2880 s5r->wbuf_len - len);
2881 s5r->wbuf_len -= len;
2882 if (s5r->wbuf_len > 0)
2884 /* not done writing */
2886 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2892 /* we're done writing, continue with state machine! */
2899 case SOCKS5_REQUEST:
2900 GNUNET_assert (NULL != s5r->rtask);
2902 case SOCKS5_DATA_TRANSFER:
2903 setup_data_transfer (s5r);
2905 case SOCKS5_WRITE_THEN_CLEANUP:
2916 * Return a server response message indicating a failure to the client.
2918 * @param s5r request to return failure code for
2919 * @param sc status code to return
2922 signal_socks_failure (struct Socks5Request *s5r,
2923 enum Socks5StatusCode sc)
2925 struct Socks5ServerResponseMessage *s_resp;
2927 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2928 memset (s_resp, 0, sizeof (struct Socks5ServerResponseMessage));
2929 s_resp->version = SOCKS_VERSION_5;
2931 s5r->state = SOCKS5_WRITE_THEN_CLEANUP;
2932 if (NULL != s5r->wtask)
2934 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2941 * Return a server response message indicating success.
2943 * @param s5r request to return success status message for
2946 signal_socks_success (struct Socks5Request *s5r)
2948 struct Socks5ServerResponseMessage *s_resp;
2950 s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
2951 s_resp->version = SOCKS_VERSION_5;
2952 s_resp->reply = SOCKS5_STATUS_REQUEST_GRANTED;
2953 s_resp->reserved = 0;
2954 s_resp->addr_type = SOCKS5_AT_IPV4;
2955 /* zero out IPv4 address and port */
2958 sizeof (struct in_addr) + sizeof (uint16_t));
2959 s5r->wbuf_len += sizeof (struct Socks5ServerResponseMessage) +
2960 sizeof (struct in_addr) + sizeof (uint16_t);
2961 if (NULL == s5r->wtask)
2963 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
2970 * Process GNS results for target domain.
2972 * @param cls the `struct Socks5Request *`
2973 * @param tld #GNUNET_YES if this was a GNS TLD.
2974 * @param rd_count number of records returned
2975 * @param rd record data
2978 handle_gns_result (void *cls,
2981 const struct GNUNET_GNSRECORD_Data *rd)
2983 struct Socks5Request *s5r = cls;
2984 const struct GNUNET_GNSRECORD_Data *r;
2987 s5r->gns_lookup = NULL;
2990 for (uint32_t i=0;i<rd_count;i++)
2993 switch (r->record_type)
2995 case GNUNET_DNSPARSER_TYPE_A:
2997 struct sockaddr_in *in;
2999 if (sizeof (struct in_addr) != r->data_size)
3001 GNUNET_break_op (0);
3004 if (GNUNET_YES == got_ip)
3007 GNUNET_NETWORK_test_pf (PF_INET))
3009 got_ip = GNUNET_YES;
3010 in = (struct sockaddr_in *) &s5r->destination_address;
3011 in->sin_family = AF_INET;
3012 GNUNET_memcpy (&in->sin_addr,
3015 in->sin_port = htons (s5r->port);
3016 #if HAVE_SOCKADDR_IN_SIN_LEN
3017 in->sin_len = sizeof (*in);
3021 case GNUNET_DNSPARSER_TYPE_AAAA:
3023 struct sockaddr_in6 *in;
3025 if (sizeof (struct in6_addr) != r->data_size)
3027 GNUNET_break_op (0);
3030 if (GNUNET_YES == got_ip)
3032 if (GNUNET_YES == disable_v6)
3035 GNUNET_NETWORK_test_pf (PF_INET6))
3037 /* FIXME: allow user to disable IPv6 per configuration option... */
3038 got_ip = GNUNET_YES;
3039 in = (struct sockaddr_in6 *) &s5r->destination_address;
3040 in->sin6_family = AF_INET6;
3041 GNUNET_memcpy (&in->sin6_addr,
3044 in->sin6_port = htons (s5r->port);
3045 #if HAVE_SOCKADDR_IN_SIN_LEN
3046 in->sin6_len = sizeof (*in);
3050 case GNUNET_GNSRECORD_TYPE_VPN:
3051 GNUNET_break (0); /* should have been translated within GNS */
3053 case GNUNET_GNSRECORD_TYPE_LEHO:
3054 GNUNET_free_non_null (s5r->leho);
3055 s5r->leho = GNUNET_strndup (r->data,
3058 case GNUNET_GNSRECORD_TYPE_BOX:
3060 const struct GNUNET_GNSRECORD_BoxRecord *box;
3062 if (r->data_size < sizeof (struct GNUNET_GNSRECORD_BoxRecord))
3064 GNUNET_break_op (0);
3068 if ( (ntohl (box->record_type) != GNUNET_DNSPARSER_TYPE_TLSA) ||
3069 (ntohs (box->protocol) != IPPROTO_TCP) ||
3070 (ntohs (box->service) != s5r->port) )
3071 break; /* BOX record does not apply */
3072 GNUNET_free_non_null (s5r->dane_data);
3073 s5r->dane_data_len = r->data_size - sizeof (struct GNUNET_GNSRECORD_BoxRecord);
3074 s5r->dane_data = GNUNET_malloc (s5r->dane_data_len);
3075 GNUNET_memcpy (s5r->dane_data,
3077 s5r->dane_data_len);
3085 if ( (GNUNET_YES != got_ip) &&
3086 (GNUNET_YES == tld) )
3088 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3089 "Name resolution failed to yield useful IP address.\n");
3090 signal_socks_failure (s5r,
3091 SOCKS5_STATUS_GENERAL_FAILURE);
3094 s5r->state = SOCKS5_DATA_TRANSFER;
3095 signal_socks_success (s5r);
3100 * Remove the first @a len bytes from the beginning of the read buffer.
3102 * @param s5r the handle clear the read buffer for
3103 * @param len number of bytes in read buffer to advance
3106 clear_from_s5r_rbuf (struct Socks5Request *s5r,
3109 GNUNET_assert (len <= s5r->rbuf_len);
3112 s5r->rbuf_len - len);
3113 s5r->rbuf_len -= len;
3118 * Read data from incoming Socks5 connection
3120 * @param cls the closure with the `struct Socks5Request`
3123 do_s5r_read (void *cls)
3125 struct Socks5Request *s5r = cls;
3126 const struct Socks5ClientHelloMessage *c_hello;
3127 struct Socks5ServerHelloMessage *s_hello;
3128 const struct Socks5ClientRequestMessage *c_req;
3131 const struct GNUNET_SCHEDULER_TaskContext *tc;
3134 tc = GNUNET_SCHEDULER_get_task_context ();
3135 if ( (NULL != tc->read_ready) &&
3136 (GNUNET_NETWORK_fdset_isset (tc->read_ready,
3139 rlen = GNUNET_NETWORK_socket_recv (s5r->sock,
3140 &s5r->rbuf[s5r->rbuf_len],
3141 sizeof (s5r->rbuf) - s5r->rbuf_len);
3144 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3145 "socks5 client disconnected.\n");
3149 s5r->rbuf_len += rlen;
3151 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3154 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3155 "Processing %zu bytes of socks data in state %d\n",
3161 c_hello = (const struct Socks5ClientHelloMessage*) &s5r->rbuf;
3162 if ( (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage)) ||
3163 (s5r->rbuf_len < sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods) )
3164 return; /* need more data */
3165 if (SOCKS_VERSION_5 != c_hello->version)
3167 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3168 _("Unsupported socks version %d\n"),
3169 (int) c_hello->version);
3173 clear_from_s5r_rbuf (s5r,
3174 sizeof (struct Socks5ClientHelloMessage) + c_hello->num_auth_methods);
3175 GNUNET_assert (0 == s5r->wbuf_len);
3176 s_hello = (struct Socks5ServerHelloMessage *) &s5r->wbuf;
3177 s5r->wbuf_len = sizeof (struct Socks5ServerHelloMessage);
3178 s_hello->version = SOCKS_VERSION_5;
3179 s_hello->auth_method = SOCKS_AUTH_NONE;
3180 GNUNET_assert (NULL == s5r->wtask);
3181 s5r->wtask = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
3184 s5r->state = SOCKS5_REQUEST;
3186 case SOCKS5_REQUEST:
3187 c_req = (const struct Socks5ClientRequestMessage *) &s5r->rbuf;
3188 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage))
3190 switch (c_req->command)
3192 case SOCKS5_CMD_TCP_STREAM:
3196 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3197 _("Unsupported socks command %d\n"),
3198 (int) c_req->command);
3199 signal_socks_failure (s5r,
3200 SOCKS5_STATUS_COMMAND_NOT_SUPPORTED);
3203 switch (c_req->addr_type)
3205 case SOCKS5_AT_IPV4:
3207 const struct in_addr *v4 = (const struct in_addr *) &c_req[1];
3208 const uint16_t *port = (const uint16_t *) &v4[1];
3209 struct sockaddr_in *in;
3211 s5r->port = ntohs (*port);
3212 alen = sizeof (struct in_addr);
3213 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
3214 alen + sizeof (uint16_t))
3215 return; /* need more data */
3216 in = (struct sockaddr_in *) &s5r->destination_address;
3217 in->sin_family = AF_INET;
3219 in->sin_port = *port;
3220 #if HAVE_SOCKADDR_IN_SIN_LEN
3221 in->sin_len = sizeof (*in);
3223 s5r->state = SOCKS5_DATA_TRANSFER;
3226 case SOCKS5_AT_IPV6:
3228 const struct in6_addr *v6 = (const struct in6_addr *) &c_req[1];
3229 const uint16_t *port = (const uint16_t *) &v6[1];
3230 struct sockaddr_in6 *in;
3232 s5r->port = ntohs (*port);
3233 alen = sizeof (struct in6_addr);
3234 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
3235 alen + sizeof (uint16_t))
3236 return; /* need more data */
3237 in = (struct sockaddr_in6 *) &s5r->destination_address;
3238 in->sin6_family = AF_INET6;
3239 in->sin6_addr = *v6;
3240 in->sin6_port = *port;
3241 #if HAVE_SOCKADDR_IN_SIN_LEN
3242 in->sin6_len = sizeof (*in);
3244 s5r->state = SOCKS5_DATA_TRANSFER;
3247 case SOCKS5_AT_DOMAINNAME:
3249 const uint8_t *dom_len;
3250 const char *dom_name;
3251 const uint16_t *port;
3253 dom_len = (const uint8_t *) &c_req[1];
3254 alen = *dom_len + 1;
3255 if (s5r->rbuf_len < sizeof (struct Socks5ClientRequestMessage) +
3256 alen + sizeof (uint16_t))
3257 return; /* need more data */
3258 dom_name = (const char *) &dom_len[1];
3259 port = (const uint16_t*) &dom_name[*dom_len];
3260 s5r->domain = GNUNET_strndup (dom_name,
3262 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3263 "Requested connection is to http%s://%s:%d\n",
3264 (HTTPS_PORT == s5r->port) ? "s" : "",
3267 s5r->state = SOCKS5_RESOLVING;
3268 s5r->port = ntohs (*port);
3269 s5r->gns_lookup = GNUNET_GNS_lookup_with_tld (gns_handle,
3271 GNUNET_DNSPARSER_TYPE_A,
3272 GNUNET_NO /* only cached */,
3278 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3279 _("Unsupported socks address type %d\n"),
3280 (int) c_req->addr_type);
3281 signal_socks_failure (s5r,
3282 SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED);
3285 clear_from_s5r_rbuf (s5r,
3286 sizeof (struct Socks5ClientRequestMessage) +
3287 alen + sizeof (uint16_t));
3288 if (0 != s5r->rbuf_len)
3290 /* read more bytes than healthy, why did the client send more!? */
3291 GNUNET_break_op (0);
3292 signal_socks_failure (s5r,
3293 SOCKS5_STATUS_GENERAL_FAILURE);
3296 if (SOCKS5_DATA_TRANSFER == s5r->state)
3298 /* if we are not waiting for GNS resolution, signal success */
3299 signal_socks_success (s5r);
3301 /* We are done reading right now */
3302 GNUNET_SCHEDULER_cancel (s5r->rtask);
3305 case SOCKS5_RESOLVING:
3308 case SOCKS5_DATA_TRANSFER:
3319 * Accept new incoming connections
3321 * @param cls the closure with the lsock4 or lsock6
3322 * @param tc the scheduler context
3325 do_accept (void *cls)
3327 struct GNUNET_NETWORK_Handle *lsock = cls;
3328 struct GNUNET_NETWORK_Handle *s;
3329 struct Socks5Request *s5r;
3331 GNUNET_assert (NULL != lsock);
3332 if (lsock == lsock4)
3333 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3337 else if (lsock == lsock6)
3338 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3344 s = GNUNET_NETWORK_socket_accept (lsock,
3349 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3353 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3354 "Got an inbound connection, waiting for data\n");
3355 s5r = GNUNET_new (struct Socks5Request);
3356 GNUNET_CONTAINER_DLL_insert (s5r_head,
3360 s5r->state = SOCKS5_INIT;
3361 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3368 /* ******************* General / main code ********************* */
3372 * Task run on shutdown
3374 * @param cls closure
3377 do_shutdown (void *cls)
3379 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3380 "Shutting down...\n");
3381 /* MHD requires resuming before destroying the daemons */
3382 for (struct Socks5Request *s5r = s5r_head;
3388 s5r->suspended = GNUNET_NO;
3389 MHD_resume_connection (s5r->con);
3392 while (NULL != mhd_httpd_head)
3393 kill_httpd (mhd_httpd_head);
3394 while (NULL != s5r_head)
3395 cleanup_s5r (s5r_head);
3398 GNUNET_NETWORK_socket_close (lsock4);
3403 GNUNET_NETWORK_socket_close (lsock6);
3406 if (NULL != curl_multi)
3408 curl_multi_cleanup (curl_multi);
3411 if (NULL != gns_handle)
3413 GNUNET_GNS_disconnect (gns_handle);
3416 if (NULL != curl_download_task)
3418 GNUNET_SCHEDULER_cancel (curl_download_task);
3419 curl_download_task = NULL;
3423 GNUNET_SCHEDULER_cancel (ltask4);
3428 GNUNET_SCHEDULER_cancel (ltask6);
3431 gnutls_x509_crt_deinit (proxy_ca.cert);
3432 gnutls_x509_privkey_deinit (proxy_ca.key);
3433 gnutls_global_deinit ();
3438 * Create an IPv4 listen socket bound to our port.
3440 * @return NULL on error
3442 static struct GNUNET_NETWORK_Handle *
3445 struct GNUNET_NETWORK_Handle *ls;
3446 struct sockaddr_in sa4;
3449 memset (&sa4, 0, sizeof (sa4));
3450 sa4.sin_family = AF_INET;
3451 sa4.sin_port = htons (port);
3452 #if HAVE_SOCKADDR_IN_SIN_LEN
3453 sa4.sin_len = sizeof (sa4);
3455 ls = GNUNET_NETWORK_socket_create (AF_INET,
3461 GNUNET_NETWORK_socket_bind (ls,
3462 (const struct sockaddr *) &sa4,
3466 GNUNET_NETWORK_socket_close (ls);
3475 * Create an IPv6 listen socket bound to our port.
3477 * @return NULL on error
3479 static struct GNUNET_NETWORK_Handle *
3482 struct GNUNET_NETWORK_Handle *ls;
3483 struct sockaddr_in6 sa6;
3486 memset (&sa6, 0, sizeof (sa6));
3487 sa6.sin6_family = AF_INET6;
3488 sa6.sin6_port = htons (port);
3489 #if HAVE_SOCKADDR_IN_SIN_LEN
3490 sa6.sin6_len = sizeof (sa6);
3492 ls = GNUNET_NETWORK_socket_create (AF_INET6,
3498 GNUNET_NETWORK_socket_bind (ls,
3499 (const struct sockaddr *) &sa6,
3503 GNUNET_NETWORK_socket_close (ls);
3512 * Main function that will be run
3514 * @param cls closure
3515 * @param args remaining command-line arguments
3516 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
3517 * @param c configuration
3522 const char *cfgfile,
3523 const struct GNUNET_CONFIGURATION_Handle *c)
3525 char* cafile_cfg = NULL;
3527 struct MhdHttpList *hd;
3531 if (NULL == (curl_multi = curl_multi_init ()))
3533 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3534 "Failed to create cURL multi handle!\n");
3537 cafile = cafile_opt;
3541 GNUNET_CONFIGURATION_get_value_filename (cfg,
3546 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
3551 cafile = cafile_cfg;
3553 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3554 "Using `%s' as CA\n",
3557 gnutls_global_init ();
3558 gnutls_x509_crt_init (&proxy_ca.cert);
3559 gnutls_x509_privkey_init (&proxy_ca.key);
3562 load_cert_from_file (proxy_ca.cert,
3565 load_key_from_file (proxy_ca.key,
3568 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3569 _("Failed to load X.509 key and certificate from `%s'\n"),
3571 gnutls_x509_crt_deinit (proxy_ca.cert);
3572 gnutls_x509_privkey_deinit (proxy_ca.key);
3573 gnutls_global_deinit ();
3574 GNUNET_free_non_null (cafile_cfg);
3577 GNUNET_free_non_null (cafile_cfg);
3578 if (NULL == (gns_handle = GNUNET_GNS_connect (cfg)))
3580 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3581 "Unable to connect to GNS!\n");
3582 gnutls_x509_crt_deinit (proxy_ca.cert);
3583 gnutls_x509_privkey_deinit (proxy_ca.key);
3584 gnutls_global_deinit ();
3587 GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
3590 /* Open listen socket for socks proxy */
3591 lsock6 = bind_v6 ();
3594 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3600 GNUNET_NETWORK_socket_listen (lsock6,
3603 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3605 GNUNET_NETWORK_socket_close (lsock6);
3610 ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3616 lsock4 = bind_v4 ();
3619 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3625 GNUNET_NETWORK_socket_listen (lsock4,
3628 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
3630 GNUNET_NETWORK_socket_close (lsock4);
3635 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
3641 if ( (NULL == lsock4) &&
3644 GNUNET_SCHEDULER_shutdown ();
3647 if (0 != curl_global_init (CURL_GLOBAL_WIN32))
3649 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3650 "cURL global init failed!\n");
3651 GNUNET_SCHEDULER_shutdown ();
3654 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3655 "Proxy listens on port %u\n",
3656 (unsigned int) port);
3658 /* start MHD daemon for HTTP */
3659 hd = GNUNET_new (struct MhdHttpList);
3660 hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_NO_LISTEN_SOCKET | MHD_ALLOW_SUSPEND_RESUME,
3663 &create_response, hd,
3664 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
3665 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
3666 MHD_OPTION_NOTIFY_CONNECTION, &mhd_connection_cb, NULL,
3667 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback, NULL,
3669 if (NULL == hd->daemon)
3672 GNUNET_SCHEDULER_shutdown ();
3676 GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
3683 * The main function for gnunet-gns-proxy.
3685 * @param argc number of arguments from the command line
3686 * @param argv command line arguments
3687 * @return 0 ok, 1 on error
3693 struct GNUNET_GETOPT_CommandLineOption options[] = {
3694 GNUNET_GETOPT_option_uint16 ('p',
3697 gettext_noop ("listen on specified port (default: 7777)"),
3699 GNUNET_GETOPT_option_string ('a',
3702 gettext_noop ("pem file to use as CA"),
3704 GNUNET_GETOPT_option_flag ('6',
3706 gettext_noop ("disable use of IPv6"),
3709 GNUNET_GETOPT_OPTION_END
3711 static const char* page =
3712 "<html><head><title>gnunet-gns-proxy</title>"
3713 "</head><body>cURL fail</body></html>";
3717 GNUNET_STRINGS_get_utf8_args (argc, argv,
3720 GNUNET_log_setup ("gnunet-gns-proxy",
3723 curl_failure_response
3724 = MHD_create_response_from_buffer (strlen (page),
3726 MHD_RESPMEM_PERSISTENT);
3730 GNUNET_PROGRAM_run (argc, argv,
3732 _("GNUnet GNS proxy"),
3734 &run, NULL)) ? 0 : 1;
3735 MHD_destroy_response (curl_failure_response);
3736 GNUNET_free_non_null ((char *) argv);
3740 /* end of gnunet-gns-proxy.c */