2 This file is part of GNUnet
3 (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 * @file transport/plugin_transport_template.c
23 * @brief template for a new transport service
24 * @author Christian Grothoff
28 #include "gnunet_protocols.h"
29 #include "gnunet_connection_lib.h"
30 #include "gnunet_server_lib.h"
31 #include "gnunet_service_lib.h"
32 #include "gnunet_statistics_service.h"
33 #include "gnunet_transport_service.h"
34 #include "plugin_transport.h"
35 #include "microhttpd.h"
36 #include <curl/curl.h>
38 #define DEBUG_HTTP GNUNET_NO
41 * Text of the response sent back after the last bytes of a PUT
42 * request have been received (just to formally obey the HTTP
45 #define HTTP_PUT_RESPONSE "Thank you!"
49 * After how long do we expire an address that we
50 * learned from another peer if it is not reconfirmed
53 #define LEARNED_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 6)
57 * Encapsulation of all of the state of the plugin.
63 * Session handle for connections.
69 * Stored in a linked list.
74 * Pointer to the global plugin struct.
76 struct Plugin *plugin;
79 * Continuation function to call once the transmission buffer
80 * has again space available. NULL if there is no
81 * continuation to call.
83 GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
86 * Closure for transmit_cont.
88 void *transmit_cont_cls;
91 * To whom are we talking to (set to our identity
92 * if we are still waiting for the welcome message)
94 struct GNUNET_PeerIdentity sender;
102 * Sender's ip address to distinguish between incoming connections
107 * Did we initiate the connection (GNUNET_YES) or the other peer (GNUNET_NO)?
109 unsigned int is_client;
112 * At what time did we reset last_received last?
114 struct GNUNET_TIME_Absolute last_quota_update;
117 * How many bytes have we received since the "last_quota_update"
120 uint64_t last_received;
123 * Number of bytes per ms that this peer is allowed
131 * Encapsulation of all of the state of the plugin.
138 struct GNUNET_TRANSPORT_PluginEnvironment *env;
141 * List of open sessions.
143 struct Session *sessions;
148 * Daemon for listening for new IPv4 connections.
150 static struct MHD_Daemon *http_daemon_v4;
153 * Daemon for listening for new IPv6connections.
155 static struct MHD_Daemon *http_daemon_v6;
158 * Our primary task for http daemon handling IPv4 connections
160 static GNUNET_SCHEDULER_TaskIdentifier http_task_v4;
163 * Our primary task for http daemon handling IPv6 connections
165 static GNUNET_SCHEDULER_TaskIdentifier http_task_v6;
167 struct Plugin *plugin;
169 static CURLM *multi_handle;
171 static struct sockaddr_in * current_ip;
174 * Finds a http session in our linked list using peer identity as a key
175 * @param peer peeridentity
176 * @return http session corresponding to peer identity
178 static struct Session * find_session_by_pi( const struct GNUNET_PeerIdentity *peer )
180 struct Session * cur;
181 GNUNET_HashCode hc_peer;
182 GNUNET_HashCode hc_current;
184 cur = plugin->sessions;
185 hc_peer = peer->hashPubKey;
188 hc_current = cur->sender.hashPubKey;
189 if ( 0 == GNUNET_CRYPTO_hash_cmp( &hc_peer, &hc_current))
191 cur = plugin->sessions->next;
198 * Finds a http session in our linked list using peer identity as a key
199 * @param peer peeridentity
200 * @return http session corresponding to peer identity
202 static struct Session * find_session_by_ip( struct sockaddr_in * addr )
205 struct Session * cur;
207 cur = plugin->sessions;
210 hc_current = cur->sender.hashPubKey;
211 if ( 0 == GNUNET_CRYPTO_hash_cmp( &hc_peer, &hc_current))
213 cur = plugin->sessions->next;
221 * Creates a http session in our linked list by peer identity
222 * Only peer is set here, all other fields have to be set by calling method
223 * @param peer peeridentity
224 * @return created http session
226 static struct Session * create_session_by_pi( const struct GNUNET_PeerIdentity *peer )
228 struct Session * cur;
229 struct Session * last_in_list;
230 /* Create a new session object */
231 cur = GNUNET_malloc (sizeof (struct Session));
232 memcpy( &(cur->sender), peer, sizeof( struct GNUNET_PeerIdentity ) );
236 /* Insert into linked list */
237 last_in_list = plugin->sessions;
238 while (last_in_list->next != NULL)
240 last_in_list = last_in_list->next;
242 last_in_list->next = cur;
248 * Creates a http session in our linked list by ip address
249 * Only ip is set here, all other fields have to be set by calling method
250 * @param peer peeridentity
251 * @return created http session
253 static struct Session * create_session_by_ip ( struct sockaddr_in * addr )
255 struct Session * cur;
256 struct Session * last_in_list;
257 /* Create a new session object */
258 cur = GNUNET_malloc (sizeof (struct Session));
259 // FIXME: memcpy( &(cur->ip), , sizeof( struct GNUNET_PeerIdentity ) );
263 /* Insert into linked list */
264 last_in_list = plugin->sessions;
265 while (last_in_list->next != NULL)
267 last_in_list = last_in_list->next;
269 last_in_list->next = cur;
275 * Callback called by MHD when a connection is terminated
277 static void requestCompletedCallback (void *cls, struct MHD_Connection * connection, void **httpSessionCache)
279 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection was terminated\n");
284 * Check if we are allowed to connect to the given IP.
287 acceptPolicyCallback (void *cls,
288 const struct sockaddr *addr, socklen_t addr_len)
290 struct sockaddr_in * addrin =(struct sockaddr_in *) addr;
291 /* 40 == max IPv6 Address length as string: (4 * 8) + (7 * :) + \0 */
292 char * address = GNUNET_malloc(40);
293 inet_ntop(addrin->sin_family, &addrin->sin_addr.s_addr,address,40);
294 memcpy( cls, addrin, sizeof (struct sockaddr_in) );
295 if (addrin->sin_family == AF_INET)
296 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Incoming IPv4 connection from `%s'\n", address);
297 if (addrin->sin_family == AF_INET6)
298 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Incoming IPv6 connection from `%s'\n",address);
299 GNUNET_free (address);
301 /* Every connection is accepted, nothing more to do here */
307 * Process GET or PUT request received via MHD. For
308 * GET, queue response that will send back our pending
309 * messages. For PUT, process incoming data and send
310 * to GNUnet core. In either case, check if a session
311 * already exists and create a new one if not.
314 accessHandlerCallback (void *cls,
315 struct MHD_Connection *session,
319 const char *upload_data,
320 size_t * upload_data_size, void **httpSessionCache)
322 struct Session * http_session;
323 struct MHD_Response *response;
324 struct sockaddr_in * addrin = (struct sockaddr_in *) cls;
325 http_session = *httpSessionCache;
326 char * address = GNUNET_malloc(40);
329 inet_ntop(addrin->sin_family, &addrin->sin_addr.s_addr,address,40);
331 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"HTTP Daemon has an incoming `%s' request from `%s'\n",method, address);
333 /* Check if new or already known session */
334 if ( NULL == http_session )
336 /* Create a new session */
338 /* Insert session into linked list*/
342 /* Is it a PUT or a GET request */
343 if ( 0 == strcmp (MHD_HTTP_METHOD_PUT, method) )
345 /* PUT method here */
346 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Got PUT Request with size %lu \n",(*upload_data_size));
347 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"URL: `%s'\n",url);
348 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"PUT Request: `%s'\n",upload_data);
349 /* FIXME: GNUNET_STATISTICS_update( plugin->env->stats , gettext_noop("# PUT requests"), 1, GNUNET_NO); */
351 *upload_data_size = 0;
352 response = MHD_create_response_from_data (strlen (HTTP_PUT_RESPONSE),HTTP_PUT_RESPONSE, MHD_NO, MHD_NO);
353 MHD_queue_response (session, MHD_HTTP_OK, response);
354 MHD_destroy_response (response);
356 if ( 0 == strcmp (MHD_HTTP_METHOD_GET, method) )
358 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Got GET Request\n");
359 //GNUNET_STATISTICS_update( plugin->env->stats , gettext_noop("# GET requests"), 1, GNUNET_NO);
362 GNUNET_free (address);
368 * Call MHD to process pending requests and then go back
369 * and schedule the next run.
371 static void http_daemon_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
374 * Function that queries MHD's select sets and
375 * starts the task waiting for them.
377 static GNUNET_SCHEDULER_TaskIdentifier
378 http_daemon_prepare (struct MHD_Daemon *daemon_handle)
380 GNUNET_SCHEDULER_TaskIdentifier ret;
384 struct GNUNET_NETWORK_FDSet *wrs;
385 struct GNUNET_NETWORK_FDSet *wws;
386 struct GNUNET_NETWORK_FDSet *wes;
388 unsigned long long timeout;
390 struct GNUNET_TIME_Relative tv;
395 wrs = GNUNET_NETWORK_fdset_create ();
396 wes = GNUNET_NETWORK_fdset_create ();
397 wws = GNUNET_NETWORK_fdset_create ();
399 GNUNET_assert (MHD_YES ==
400 MHD_get_fdset (daemon_handle,
405 haveto = MHD_get_timeout (daemon_handle, &timeout);
406 if (haveto == MHD_YES)
407 tv.value = (uint64_t) timeout;
409 tv = GNUNET_TIME_UNIT_FOREVER_REL;
410 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max);
411 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max);
412 GNUNET_NETWORK_fdset_copy_native (wes, &es, max);
413 ret = GNUNET_SCHEDULER_add_select (plugin->env->sched,
414 GNUNET_SCHEDULER_PRIORITY_HIGH,
415 GNUNET_SCHEDULER_NO_TASK,
421 GNUNET_NETWORK_fdset_destroy (wrs);
422 GNUNET_NETWORK_fdset_destroy (wws);
423 GNUNET_NETWORK_fdset_destroy (wes);
428 * Call MHD to process pending requests and then go back
429 * and schedule the next run.
432 http_daemon_run (void *cls,
433 const struct GNUNET_SCHEDULER_TaskContext *tc)
435 struct MHD_Daemon *daemon_handle = cls;
437 if (daemon_handle == http_daemon_v4)
438 http_task_v4 = GNUNET_SCHEDULER_NO_TASK;
440 if (daemon_handle == http_daemon_v6)
441 http_task_v6 = GNUNET_SCHEDULER_NO_TASK;
443 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
446 GNUNET_assert (MHD_YES == MHD_run (daemon_handle));
447 if (daemon_handle == http_daemon_v4)
448 http_task_v4 = http_daemon_prepare (daemon_handle);
449 if (daemon_handle == http_daemon_v6)
450 http_task_v6 = http_daemon_prepare (daemon_handle);
454 static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream)
458 fprintf(stdout, "*** Read callback: size %u, size nmemb: %u \n", size, nmemb);
459 retcode = fread(ptr, size, nmemb, stream);
466 * Function that can be used by the transport service to transmit
467 * a message using the plugin.
470 * @param target who should receive this message
471 * @param priority how important is the message
472 * @param msgbuf the message to transmit
473 * @param msgbuf_size number of bytes in 'msgbuf'
474 * @param timeout when should we time out
475 * @param session which session must be used (or NULL for "any")
476 * @param addr the address to use (can be NULL if the plugin
477 * is "on its own" (i.e. re-use existing TCP connection))
478 * @param addrlen length of the address in bytes
479 * @param force_address GNUNET_YES if the plugin MUST use the given address,
480 * otherwise the plugin may use other addresses or
481 * existing connections (if available)
482 * @param cont continuation to call once the message has
483 * been transmitted (or if the transport is ready
484 * for the next transmission call; or if the
485 * peer disconnected...)
486 * @param cont_cls closure for cont
487 * @return number of bytes used (on the physical network, with overheads);
488 * -1 on hard errors (i.e. address invalid); 0 is a legal value
489 * and does NOT mean that the message was not transmitted (DV)
492 template_plugin_send (void *cls,
493 const struct GNUNET_PeerIdentity *
497 unsigned int priority,
498 struct GNUNET_TIME_Relative timeout,
499 struct Session *session,
503 GNUNET_TRANSPORT_TransmitContinuation
504 cont, void *cont_cls)
508 /* struct Plugin *plugin = cls; */
512 /* find session for peer */
513 ses = find_session_by_pi (target);
514 if ( ses == NULL) create_session_by_pi (target);
516 char *url = "http://localhost:12389";
518 curl_handle = curl_easy_init();
519 if( NULL == curl_handle)
521 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Getting cURL handle failed\n");
524 curl_easy_setopt(curl_handle, CURLOPT_VERBOSE, 1L);
525 curl_easy_setopt(curl_handle, CURLOPT_READFUNCTION, read_callback);
526 curl_easy_setopt(curl_handle, CURLOPT_UPLOAD, 1L);
527 curl_easy_setopt(curl_handle, CURLOPT_PUT, 1L);
528 curl_easy_setopt(curl_handle, CURLOPT_URL, url);
529 curl_easy_setopt(curl_handle, CURLOPT_READDATA, msgbuf);
530 curl_easy_setopt(curl_handle, CURLOPT_INFILESIZE_LARGE,
531 (curl_off_t)msgbuf_size);
541 * Function that can be used to force the plugin to disconnect
542 * from the given peer and cancel all previous transmissions
543 * (and their continuationc).
546 * @param target peer from which to disconnect
549 template_plugin_disconnect (void *cls,
550 const struct GNUNET_PeerIdentity *target)
552 // struct Plugin *plugin = cls;
558 * Convert the transports address to a nice, human-readable
562 * @param type name of the transport that generated the address
563 * @param addr one of the addresses of the host, NULL for the last address
564 * the specific address format depends on the transport
565 * @param addrlen length of the address
566 * @param numeric should (IP) addresses be displayed in numeric form?
567 * @param timeout after how long should we give up?
568 * @param asc function to call on each string
569 * @param asc_cls closure for asc
572 template_plugin_address_pretty_printer (void *cls,
577 struct GNUNET_TIME_Relative timeout,
578 GNUNET_TRANSPORT_AddressStringCallback
587 * Another peer has suggested an address for this
588 * peer and transport plugin. Check that this could be a valid
589 * address. If so, consider adding it to the list
593 * @param addr pointer to the address
594 * @param addrlen length of addr
595 * @return GNUNET_OK if this is a plausible address for this peer
599 template_plugin_address_suggested (void *cls,
600 void *addr, size_t addrlen)
602 /* struct Plugin *plugin = cls; */
604 /* check if the address is plausible; if so,
605 add it to our list! */
611 * Function called for a quick conversion of the binary address to
612 * a numeric address. Note that the caller must not free the
613 * address and that the next call to this function is allowed
614 * to override the address again.
617 * @param addr binary address
618 * @param addrlen length of the address
619 * @return string representing the same address
622 template_plugin_address_to_string (void *cls,
631 * Exit point from the plugin.
634 libgnunet_plugin_transport_http_done (void *cls)
636 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
637 struct Plugin *plugin = api->cls;
639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Unloading http plugin...\n");
641 if ( http_task_v4 != GNUNET_SCHEDULER_NO_TASK)
643 GNUNET_SCHEDULER_cancel(plugin->env->sched, http_task_v4);
644 http_task_v4 = GNUNET_SCHEDULER_NO_TASK;
647 if ( http_task_v6 != GNUNET_SCHEDULER_NO_TASK)
649 GNUNET_SCHEDULER_cancel(plugin->env->sched, http_task_v6);
650 http_task_v6 = GNUNET_SCHEDULER_NO_TASK;
653 if (http_daemon_v4 != NULL)
655 MHD_stop_daemon (http_daemon_v4);
656 http_daemon_v4 = NULL;
658 if (http_daemon_v6 != NULL)
660 MHD_stop_daemon (http_daemon_v6);
661 http_daemon_v6 = NULL;
664 curl_multi_cleanup(multi_handle);
666 GNUNET_free (current_ip);
667 GNUNET_free (plugin);
674 * Entry point for the plugin.
677 libgnunet_plugin_transport_http_init (void *cls)
679 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
680 struct GNUNET_TRANSPORT_PluginFunctions *api;
682 long long unsigned int port;
684 plugin = GNUNET_malloc (sizeof (struct Plugin));
686 plugin->sessions = NULL;
687 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
689 api->send = &template_plugin_send;
690 api->disconnect = &template_plugin_disconnect;
691 api->address_pretty_printer = &template_plugin_address_pretty_printer;
692 api->check_address = &template_plugin_address_suggested;
693 api->address_to_string = &template_plugin_address_to_string;
695 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Starting http plugin...\n");
696 /* Reading port number from config file */
698 GNUNET_CONFIGURATION_get_value_number (env->cfg,
704 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
707 ("Require valid port number for transport plugin `%s' in configuration!\n"),
709 libgnunet_plugin_transport_http_done (api);
713 current_ip = GNUNET_malloc ( sizeof(struct sockaddr_in) );
715 if ((http_daemon_v4 == NULL) && (http_daemon_v6 == NULL) && (port != 0))
717 http_daemon_v6 = MHD_start_daemon (MHD_USE_IPv6,
719 &acceptPolicyCallback,
720 current_ip, &accessHandlerCallback, current_ip,
721 MHD_OPTION_CONNECTION_LIMIT, (unsigned int) 16,
722 MHD_OPTION_PER_IP_CONNECTION_LIMIT, (unsigned int) 1,
723 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
724 MHD_OPTION_CONNECTION_MEMORY_LIMIT, (size_t) (16 * 1024),
725 MHD_OPTION_NOTIFY_COMPLETED, &requestCompletedCallback, NULL,
727 http_daemon_v4 = MHD_start_daemon (MHD_NO_FLAG,
729 &acceptPolicyCallback,
730 NULL, &accessHandlerCallback, NULL,
731 MHD_OPTION_CONNECTION_LIMIT, (unsigned int) 16,
732 MHD_OPTION_PER_IP_CONNECTION_LIMIT, (unsigned int) 1,
733 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
734 MHD_OPTION_CONNECTION_MEMORY_LIMIT, (size_t) (16 * 1024),
735 MHD_OPTION_NOTIFY_COMPLETED, &requestCompletedCallback, NULL,
739 if (http_daemon_v4 != NULL)
740 http_task_v4 = http_daemon_prepare (http_daemon_v4);
741 if (http_daemon_v6 != NULL)
742 http_task_v6 = http_daemon_prepare (http_daemon_v6);
744 if (http_task_v4 != GNUNET_SCHEDULER_NO_TASK)
745 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Starting MHD with IPv4 on port %u\n",port);
746 if (http_task_v6 != GNUNET_SCHEDULER_NO_TASK)
747 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Starting MHD with IPv4 and IPv6 on port %u\n",port);
749 /* Initializing cURL */
750 multi_handle = curl_multi_init();
755 /* end of plugin_transport_template.c */