2 This file is part of GNUnet
3 (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file transport/plugin_transport_template.c
23 * @brief template for a new transport service
24 * @author Christian Grothoff
28 #include "gnunet_constants.h"
29 #include "gnunet_protocols.h"
30 #include "gnunet_connection_lib.h"
31 #include "gnunet_server_lib.h"
32 #include "gnunet_service_lib.h"
33 #include "gnunet_statistics_service.h"
34 #include "gnunet_transport_service.h"
35 #include "gnunet_resolver_service.h"
36 #include "plugin_transport.h"
37 #include "gnunet_os_lib.h"
38 #include "microhttpd.h"
39 #include <curl/curl.h>
41 #define DEBUG_HTTP GNUNET_NO
44 * Text of the response sent back after the last bytes of a PUT
45 * request have been received (just to formally obey the HTTP
48 #define HTTP_PUT_RESPONSE "Thank you!"
51 * After how long do we expire an address that we
52 * learned from another peer if it is not reconfirmed
55 #define LEARNED_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 6)
58 * Page returned if request invalid
60 #define HTTP_ERROR_RESPONSE "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\"><HTML><HEAD><TITLE>404 Not Found</TITLE></HEAD><BODY><H1>Not Found</H1>The requested URL was not found on this server.<P><HR><ADDRESS></ADDRESS></BODY></HTML>"
63 * Timeout for a http connect
65 #define HTTP_CONNECT_TIMEOUT 30
69 * Encapsulation of all of the state of the plugin.
74 * Network format for IPv4 addresses.
76 struct IPv4HttpAddress
79 * IPv4 address, in network byte order.
84 * Port number, in network byte order.
92 * Network format for IPv6 addresses.
94 struct IPv6HttpAddress
99 struct in6_addr ipv6_addr;
102 * Port number, in network byte order.
111 * Message to send using http
116 * Next field for linked list
118 struct HTTP_Message * next;
121 * buffer containing data to send
126 * amount of data already sent
131 * amount of data to sent
138 * Session handle for connections.
144 * Stored in a linked list.
146 struct Session *next;
149 * Pointer to the global plugin struct.
151 struct Plugin *plugin;
154 * Continuation function to call once the transmission buffer
155 * has again space available. NULL if there is no
156 * continuation to call.
158 GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
161 * Closure for transmit_cont.
163 void *transmit_cont_cls;
166 * To whom are we talking to (set to our identity
167 * if we are still waiting for the welcome message)
169 struct GNUNET_PeerIdentity sender;
177 * Sender's ip address to distinguish between incoming connections
182 * Sender's ip address to distinguish between incoming connections
184 struct sockaddr_in * addr;
187 * Did we initiate the connection (GNUNET_YES) or the other peer (GNUNET_NO)?
189 unsigned int is_client;
192 * Is the connection active (GNUNET_YES) or terminated (GNUNET_NO)?
194 unsigned int is_active;
197 * At what time did we reset last_received last?
199 struct GNUNET_TIME_Absolute last_quota_update;
202 * How many bytes have we received since the "last_quota_update"
205 uint64_t last_received;
208 * Number of bytes per ms that this peer is allowed
214 * Is there a HTTP/PUT in progress?
216 unsigned int is_put_in_progress;
221 struct GNUNET_CRYPTO_HashAsciiEncoded hash;
223 struct HTTP_Message * pending_outbound_msg;;
229 * Encapsulation of all of the state of the plugin.
236 struct GNUNET_TRANSPORT_PluginEnvironment *env;
239 * Handle to the network service.
241 struct GNUNET_SERVICE_Context *service;
243 unsigned int port_inbound;
246 * List of open sessions.
248 struct Session *sessions;
251 * Number of active sessions
254 unsigned int session_count;
258 * Daemon for listening for new IPv4 connections.
260 static struct MHD_Daemon *http_daemon_v4;
263 * Daemon for listening for new IPv6connections.
265 static struct MHD_Daemon *http_daemon_v6;
268 * Our primary task for http daemon handling IPv4 connections
270 static GNUNET_SCHEDULER_TaskIdentifier http_task_v4;
273 * Our primary task for http daemon handling IPv6 connections
275 static GNUNET_SCHEDULER_TaskIdentifier http_task_v6;
279 * The task sending data
281 static GNUNET_SCHEDULER_TaskIdentifier http_task_send;
285 * Information about this plugin
287 static struct Plugin *plugin;
292 static CURLM *multi_handle;
297 static char * hostname;
300 * Our ASCII encoded, hashed peer identity
301 * This string is used to distinguish between connections and is added to the urls
303 static struct GNUNET_CRYPTO_HashAsciiEncoded my_ascii_hash_ident;
305 struct GNUNET_TIME_Relative timeout;
308 * Finds a http session in our linked list using peer identity as a key
309 * @param peer peeridentity
310 * @return http session corresponding to peer identity
312 static struct Session * find_session_by_pi( const struct GNUNET_PeerIdentity *peer )
314 struct Session * cur;
315 GNUNET_HashCode hc_peer;
316 GNUNET_HashCode hc_current;
318 cur = plugin->sessions;
319 hc_peer = peer->hashPubKey;
322 hc_current = cur->sender.hashPubKey;
323 if ( 0 == GNUNET_CRYPTO_hash_cmp( &hc_peer, &hc_current))
325 cur = plugin->sessions->next;
331 * Finds a http session in our linked list using libcurl handle as a key
332 * Needed when sending data with libcurl to differentiate between sessions
333 * @param handle peeridentity
334 * @return http session corresponding to peer identity
336 static struct Session * find_session_by_curlhandle( CURL* handle )
338 struct Session * cur;
340 cur = plugin->sessions;
343 if ( handle == cur->curl_handle )
345 cur = plugin->sessions->next;
351 * Create a new session
353 * @param address address the peer is using
354 * @param peer identity
355 * @return created session object
357 static struct Session * create_session (struct sockaddr_in *address, const struct GNUNET_PeerIdentity *peer)
359 struct sockaddr_in *addrin;
360 struct sockaddr_in6 *addrin6;
362 struct Session * ses = GNUNET_malloc ( sizeof( struct Session) );
363 ses->addr = GNUNET_malloc ( sizeof (struct sockaddr_in) );
366 ses->plugin = plugin;
368 memcpy(ses->addr, address, sizeof (struct sockaddr_in));
369 if ( AF_INET == address->sin_family)
371 ses->ip = GNUNET_malloc (INET_ADDRSTRLEN);
373 inet_ntop(addrin->sin_family,&(addrin->sin_addr),ses->ip,INET_ADDRSTRLEN);
375 if ( AF_INET6 == address->sin_family)
377 ses->ip = GNUNET_malloc (INET6_ADDRSTRLEN);
378 addrin6 = (struct sockaddr_in6 *) address;
379 inet_ntop(addrin6->sin6_family, &(addrin6->sin6_addr) ,ses->ip,INET6_ADDRSTRLEN);
381 memcpy(&ses->sender, peer, sizeof (struct GNUNET_PeerIdentity));
382 GNUNET_CRYPTO_hash_to_enc(&ses->sender.hashPubKey,&(ses->hash));
383 ses->is_active = GNUNET_NO;
389 * Callback called by MHD when a connection is terminated
391 static void requestCompletedCallback (void *cls, struct MHD_Connection * connection, void **httpSessionCache)
395 cs = *httpSessionCache;
398 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection from peer `%s' was terminated\n",GNUNET_i2s(&cs->sender));
399 /* session set to inactive */
400 cs->is_active = GNUNET_NO;
401 cs->is_put_in_progress = GNUNET_NO;
407 * Check if we are allowed to connect to the given IP.
410 acceptPolicyCallback (void *cls,
411 const struct sockaddr *addr, socklen_t addr_len)
413 /* Every connection is accepted, nothing more to do here */
419 * Process GET or PUT request received via MHD. For
420 * GET, queue response that will send back our pending
421 * messages. For PUT, process incoming data and send
422 * to GNUnet core. In either case, check if a session
423 * already exists and create a new one if not.
426 accessHandlerCallback (void *cls,
427 struct MHD_Connection *session,
431 const char *upload_data,
432 size_t * upload_data_size, void **httpSessionCache)
434 struct MHD_Response *response;
436 struct Session * cs_temp;
437 const union MHD_ConnectionInfo * conn_info;
438 struct sockaddr_in *addrin;
439 struct sockaddr_in6 *addrin6;
440 char * address = NULL;
441 struct GNUNET_PeerIdentity pi_in;
444 struct GNUNET_MessageHeader *gn_msg;
445 int send_error_to_client;
448 send_error_to_client = GNUNET_NO;
449 if ( NULL == *httpSessionCache)
451 /* check url for peer identity */
452 res = GNUNET_CRYPTO_hash_from_string ( &url[1], &(pi_in.hashPubKey));
453 if ( GNUNET_SYSERR == res )
455 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Peer has no valid ident\n");
456 response = MHD_create_response_from_data (strlen (HTTP_ERROR_RESPONSE),HTTP_ERROR_RESPONSE, MHD_NO, MHD_NO);
457 res = MHD_queue_response (session, MHD_HTTP_NOT_FOUND, response);
458 MHD_destroy_response (response);
462 conn_info = MHD_get_connection_info(session, MHD_CONNECTION_INFO_CLIENT_ADDRESS );
463 /* Incoming IPv4 connection */
464 if ( AF_INET == conn_info->client_addr->sin_family)
466 address = GNUNET_malloc (INET_ADDRSTRLEN);
467 addrin = conn_info->client_addr;
468 inet_ntop(addrin->sin_family, &(addrin->sin_addr),address,INET_ADDRSTRLEN);
470 /* Incoming IPv6 connection */
471 if ( AF_INET6 == conn_info->client_addr->sin_family)
473 address = GNUNET_malloc (INET6_ADDRSTRLEN);
474 addrin6 = (struct sockaddr_in6 *) conn_info->client_addr;
475 inet_ntop(addrin6->sin6_family, &(addrin6->sin6_addr),address,INET6_ADDRSTRLEN);
477 /* find existing session for address */
479 if (plugin->session_count > 0)
481 cs = plugin->sessions;
485 /* Comparison based on ip address */
486 // res = (0 == memcmp(&(conn_info->client_addr->sin_addr),&(cs->addr->sin_addr), sizeof (struct in_addr))) ? GNUNET_YES : GNUNET_NO;
488 /* Comparison based on ip address, port number and address family */
489 // res = (0 == memcmp((conn_info->client_addr),(cs->addr), sizeof (struct sockaddr_in))) ? GNUNET_YES : GNUNET_NO;
491 /* Comparison based on PeerIdentity */
492 res = (0 == memcmp(&pi_in,&(cs->sender), sizeof (struct GNUNET_PeerIdentity))) ? GNUNET_YES : GNUNET_NO;
494 if ( GNUNET_YES == res)
496 /* existing session for this address found */
497 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Session `%s' found\n",address);
503 /* no existing session, create a new one*/
506 /* create new session object */
507 cs = create_session(conn_info->client_addr, &pi_in);
509 /* Insert session into linked list */
510 if ( plugin->sessions == NULL)
512 plugin->sessions = cs;
513 plugin->session_count = 1;
515 cs_temp = plugin->sessions;
516 while ( cs_temp->next != NULL )
518 cs_temp = cs_temp->next;
523 plugin->session_count++;
525 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"New Session `%s' inserted, count %u \n", address, plugin->session_count);
528 if (*httpSessionCache == NULL)
530 *httpSessionCache = cs;
532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"HTTP Daemon has new an incoming `%s' request from peer `%s' (`[%s]:%u')\n",method, GNUNET_i2s(&cs->sender),cs->ip,cs->addr->sin_port);
536 cs = *httpSessionCache;
538 /* Is it a PUT or a GET request */
539 if ( 0 == strcmp (MHD_HTTP_METHOD_PUT, method) )
542 if ((*upload_data_size == 0) && (cs->is_put_in_progress == GNUNET_NO))
545 cs->is_put_in_progress = GNUNET_YES;
546 cs->is_active = GNUNET_YES;
549 if ( *upload_data_size > 0 )
551 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"PUT URL: `%s'\n",url);
552 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"PUT Request: %lu bytes: `%s' \n", (*upload_data_size), upload_data);
554 bytes_recv = *upload_data_size ;
555 *upload_data_size = 0;
558 if (bytes_recv < sizeof (struct GNUNET_MessageHeader))
560 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Message too small, is %u bytes, has to be at least %u '\n",bytes_recv, sizeof(struct GNUNET_MessageHeader));
561 send_error_to_client = GNUNET_YES;
564 if ( bytes_recv > GNUNET_SERVER_MAX_MESSAGE_SIZE)
566 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Message too big, is %u bytes, maximum %u '\n",bytes_recv, GNUNET_SERVER_MAX_MESSAGE_SIZE);
567 send_error_to_client = GNUNET_YES;
570 struct GNUNET_MessageHeader * gn_msg = GNUNET_malloc (bytes_recv);
571 memcpy (gn_msg,upload_data,bytes_recv);
573 if ( ntohs(gn_msg->size) != bytes_recv )
575 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Message has incorrect size, is %u bytes vs %u recieved'\n",ntohs(gn_msg->size) , bytes_recv);
576 send_error_to_client = GNUNET_YES;
579 if ( GNUNET_YES == send_error_to_client)
581 response = MHD_create_response_from_data (strlen (HTTP_PUT_RESPONSE),HTTP_PUT_RESPONSE, MHD_NO, MHD_NO);
582 res = MHD_queue_response (session, MHD_HTTP_BAD_REQUEST, response);
583 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Sent HTTP/1.1: 400 BAD REQUEST as PUT Response\n",HTTP_PUT_RESPONSE, strlen (HTTP_PUT_RESPONSE), res );
584 MHD_destroy_response (response);
585 GNUNET_free (gn_msg);
588 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Recieved GNUnet message type %u size %u and payload %u \n",ntohs (gn_msg->type), ntohs (gn_msg->size), ntohs (gn_msg->size)-sizeof(struct GNUNET_MessageHeader));
590 /* forwarding message to transport */
591 plugin->env->receive(plugin->env, &(cs->sender), gn_msg, 1, cs , cs->ip, strlen(cs->ip) );
594 if ((*upload_data_size == 0) && (cs->is_put_in_progress == GNUNET_YES))
596 cs->is_put_in_progress = GNUNET_NO;
597 response = MHD_create_response_from_data (strlen (HTTP_PUT_RESPONSE),HTTP_PUT_RESPONSE, MHD_NO, MHD_NO);
598 res = MHD_queue_response (session, MHD_HTTP_OK, response);
599 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Sent HTTP/1.1: 200 OK as PUT Response\n",HTTP_PUT_RESPONSE, strlen (HTTP_PUT_RESPONSE), res );
600 MHD_destroy_response (response);
604 if ( 0 == strcmp (MHD_HTTP_METHOD_GET, method) )
606 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Got GET Request\n");
607 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"URL: `%s'\n",url);
608 response = MHD_create_response_from_data (strlen (HTTP_PUT_RESPONSE),HTTP_PUT_RESPONSE, MHD_NO, MHD_NO);
609 res = MHD_queue_response (session, MHD_HTTP_OK, response);
610 MHD_destroy_response (response);
618 * Call MHD to process pending requests and then go back
619 * and schedule the next run.
621 static void http_daemon_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
624 * Function that queries MHD's select sets and
625 * starts the task waiting for them.
627 static GNUNET_SCHEDULER_TaskIdentifier
628 http_daemon_prepare (struct MHD_Daemon *daemon_handle)
630 GNUNET_SCHEDULER_TaskIdentifier ret;
634 struct GNUNET_NETWORK_FDSet *wrs;
635 struct GNUNET_NETWORK_FDSet *wws;
636 struct GNUNET_NETWORK_FDSet *wes;
638 unsigned long long timeout;
640 struct GNUNET_TIME_Relative tv;
645 wrs = GNUNET_NETWORK_fdset_create ();
646 wes = GNUNET_NETWORK_fdset_create ();
647 wws = GNUNET_NETWORK_fdset_create ();
649 GNUNET_assert (MHD_YES ==
650 MHD_get_fdset (daemon_handle,
655 haveto = MHD_get_timeout (daemon_handle, &timeout);
656 if (haveto == MHD_YES)
657 tv.value = (uint64_t) timeout;
659 tv = GNUNET_TIME_UNIT_FOREVER_REL;
660 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max);
661 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max);
662 GNUNET_NETWORK_fdset_copy_native (wes, &es, max);
663 ret = GNUNET_SCHEDULER_add_select (plugin->env->sched,
664 GNUNET_SCHEDULER_PRIORITY_HIGH,
665 GNUNET_SCHEDULER_NO_TASK,
671 GNUNET_NETWORK_fdset_destroy (wrs);
672 GNUNET_NETWORK_fdset_destroy (wws);
673 GNUNET_NETWORK_fdset_destroy (wes);
678 * Call MHD to process pending requests and then go back
679 * and schedule the next run.
681 static void http_daemon_run (void *cls,
682 const struct GNUNET_SCHEDULER_TaskContext *tc)
684 struct MHD_Daemon *daemon_handle = cls;
686 if (daemon_handle == http_daemon_v4)
687 http_task_v4 = GNUNET_SCHEDULER_NO_TASK;
689 if (daemon_handle == http_daemon_v6)
690 http_task_v6 = GNUNET_SCHEDULER_NO_TASK;
692 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
695 GNUNET_assert (MHD_YES == MHD_run (daemon_handle));
696 if (daemon_handle == http_daemon_v4)
697 http_task_v4 = http_daemon_prepare (daemon_handle);
698 if (daemon_handle == http_daemon_v6)
699 http_task_v6 = http_daemon_prepare (daemon_handle);
704 * Removes a message from the linked list of messages
705 * @param ses session to remove message from
706 * @param msg message to remove
707 * @return GNUNET_SYSERR if msg not found, GNUNET_OK on success
710 static int remove_http_message(struct Session * ses, struct HTTP_Message * msg)
712 struct HTTP_Message * cur;
713 struct HTTP_Message * next;
715 cur = ses->pending_outbound_msg;
719 return GNUNET_SYSERR;
723 ses->pending_outbound_msg = cur->next;
724 GNUNET_free (cur->buf);
730 while (cur->next!=msg)
732 if (cur->next != NULL)
735 return GNUNET_SYSERR;
738 cur->next = cur->next->next;
739 GNUNET_free (cur->next->buf);
740 GNUNET_free (cur->next);
747 * Callback method used with libcurl
748 * Method is called when libcurl needs to read data during sending
749 * @param stream pointer where to write data
750 * @param size size of an individual element
751 * @param nmemb count of elements that can be written to the buffer
752 * @param ptr source pointer, passed to the libcurl handle
753 * @return bytes written to stream
755 static size_t send_read_callback(void *stream, size_t size, size_t nmemb, void *ptr)
757 struct Session * ses = ptr;
758 struct HTTP_Message * msg = ses->pending_outbound_msg;
759 unsigned int bytes_sent;
762 if (msg->len > (size * nmemb))
763 return CURL_READFUNC_ABORT;
765 if (( msg->pos < msg->len) && (msg->len < (size * nmemb)))
767 memcpy(stream, msg->buf, msg->len);
769 bytes_sent = msg->len;
776 * Callback method used with libcurl
777 * Method is called when libcurl needs to write data during sending
778 * @param stream pointer where to write data
779 * @param size size of an individual element
780 * @param nmemb count of elements that can be written to the buffer
781 * @param ptr destination pointer, passed to the libcurl handle
782 * @return bytes read from stream
784 static size_t send_write_callback( void *stream, size_t size, size_t nmemb, void *ptr)
786 char * data = malloc(size*nmemb +1);
788 memcpy( data, stream, size*nmemb);
789 data[size*nmemb] = '\0';
790 /* Just a dummy print for the response recieved for the PUT message */
791 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Recieved %u bytes: `%s' \n", size * nmemb, data);
793 return (size * nmemb);
798 * Function setting up file descriptors and scheduling task to run
799 * @param session session to send data to
800 * @return bytes sent to peer
802 static size_t send_prepare(struct Session* session );
805 * Function setting up curl handle and selecting message to send
806 * @param ses session to send data to
807 * @return bytes sent to peer
809 static ssize_t send_select_init (struct Session* ses )
814 struct HTTP_Message * msg;
816 /* FIFO selection, send oldest msg first, perhaps priority here? */
817 msg = ses->pending_outbound_msg;
819 url = GNUNET_malloc( 7 + strlen(ses->ip) + 7 + strlen ((char *) &(ses->hash)) + 1);
820 /* FIXME: use correct port number */
821 GNUNET_asprintf(&url,"http://%s:%u/%s",ses->ip,12389, (char *) &(ses->hash));
823 /* curl_easy_setopt(ses->curl_handle, CURLOPT_VERBOSE, 1L); */
824 curl_easy_setopt(ses->curl_handle, CURLOPT_URL, url);
825 curl_easy_setopt(ses->curl_handle, CURLOPT_PUT, 1L);
826 curl_easy_setopt(ses->curl_handle, CURLOPT_READFUNCTION, send_read_callback);
827 curl_easy_setopt(ses->curl_handle, CURLOPT_READDATA, ses);
828 curl_easy_setopt(ses->curl_handle, CURLOPT_WRITEFUNCTION, send_write_callback);
829 curl_easy_setopt(ses->curl_handle, CURLOPT_READDATA, ses);
830 curl_easy_setopt(ses->curl_handle, CURLOPT_INFILESIZE_LARGE, (curl_off_t) msg->len);
831 curl_easy_setopt(ses->curl_handle, CURLOPT_TIMEOUT, (long) (timeout.value / 1000 ));
832 curl_easy_setopt(ses->curl_handle, CURLOPT_CONNECTTIMEOUT, HTTP_CONNECT_TIMEOUT);
834 mret = curl_multi_add_handle(multi_handle, ses->curl_handle);
835 if (mret != CURLM_OK)
837 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
838 _("%s failed at %s:%d: `%s'\n"),
839 "curl_multi_add_handle", __FILE__, __LINE__,
840 curl_multi_strerror (mret));
843 bytes_sent = send_prepare (ses );
848 static void send_execute (void *cls,
849 const struct GNUNET_SCHEDULER_TaskContext *tc)
854 struct Session * cs = NULL;
856 http_task_send = GNUNET_SCHEDULER_NO_TASK;
857 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
863 mret = curl_multi_perform (multi_handle, &running);
869 msg = curl_multi_info_read (multi_handle, &running);
870 GNUNET_break (msg != NULL);
873 /* get session for affected curl handle */
874 cs = find_session_by_curlhandle (msg->easy_handle);
875 GNUNET_assert ( cs != NULL );
880 if ( (msg->data.result != CURLE_OK) &&
881 (msg->data.result != CURLE_GOT_NOTHING) )
884 GNUNET_log(GNUNET_ERROR_TYPE_INFO,
885 _("%s failed for `%s' at %s:%d: `%s'\n"),
886 "curl_multi_perform",
890 curl_easy_strerror (msg->data.result));
891 /* sending msg failed*/
892 if ( NULL != cs->transmit_cont)
893 cs->transmit_cont (NULL,&cs->sender,GNUNET_SYSERR);
897 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
898 "Send to %s completed.\n", cs->ip);
899 if (GNUNET_OK != remove_http_message(cs, cs->pending_outbound_msg))
900 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message could not be removed from session `%s'", GNUNET_i2s(&cs->sender));
902 curl_easy_cleanup(cs->curl_handle);
903 cs->curl_handle=NULL;
905 /* send pending messages */
906 if (cs->pending_outbound_msg != NULL)
907 send_select_init (cs);
909 /* Calling transmit continuation */
910 if ( NULL != cs->transmit_cont)
911 cs->transmit_cont (NULL,&cs->sender,GNUNET_OK);
919 while ( (running > 0) );
922 while (mret == CURLM_CALL_MULTI_PERFORM);
928 * Function setting up file descriptors and scheduling task to run
929 * @param ses session to send data to
930 * @return bytes sent to peer
932 static size_t send_prepare(struct Session* session )
938 struct GNUNET_NETWORK_FDSet *grs;
939 struct GNUNET_NETWORK_FDSet *gws;
947 mret = curl_multi_fdset (multi_handle, &rs, &ws, &es, &max);
948 if (mret != CURLM_OK)
950 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
951 _("%s failed at %s:%d: `%s'\n"),
952 "curl_multi_fdset", __FILE__, __LINE__,
953 curl_multi_strerror (mret));
956 mret = curl_multi_timeout (multi_handle, &to);
957 if (mret != CURLM_OK)
959 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
960 _("%s failed at %s:%d: `%s'\n"),
961 "curl_multi_timeout", __FILE__, __LINE__,
962 curl_multi_strerror (mret));
966 grs = GNUNET_NETWORK_fdset_create ();
967 gws = GNUNET_NETWORK_fdset_create ();
968 GNUNET_NETWORK_fdset_copy_native (grs, &rs, max + 1);
969 GNUNET_NETWORK_fdset_copy_native (gws, &ws, max + 1);
970 http_task_send = GNUNET_SCHEDULER_add_select (plugin->env->sched,
971 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
972 GNUNET_SCHEDULER_NO_TASK,
973 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 0),
978 GNUNET_NETWORK_fdset_destroy (gws);
979 GNUNET_NETWORK_fdset_destroy (grs);
981 /* FIXME: return bytes REALLY sent */
986 * Function that can be used by the transport service to transmit
987 * a message using the plugin.
990 * @param target who should receive this message
991 * @param priority how important is the message
992 * @param msgbuf the message to transmit
993 * @param msgbuf_size number of bytes in 'msgbuf'
994 * @param to when should we time out
995 * @param session which session must be used (or NULL for "any")
996 * @param addr the address to use (can be NULL if the plugin
997 * is "on its own" (i.e. re-use existing TCP connection))
998 * @param addrlen length of the address in bytes
999 * @param force_address GNUNET_YES if the plugin MUST use the given address,
1000 * otherwise the plugin may use other addresses or
1001 * existing connections (if available)
1002 * @param cont continuation to call once the message has
1003 * been transmitted (or if the transport is ready
1004 * for the next transmission call; or if the
1005 * peer disconnected...)
1006 * @param cont_cls closure for cont
1007 * @return number of bytes used (on the physical network, with overheads);
1008 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1009 * and does NOT mean that the message was not transmitted (DV)
1012 http_plugin_send (void *cls,
1013 const struct GNUNET_PeerIdentity *target,
1016 unsigned int priority,
1017 struct GNUNET_TIME_Relative to,
1018 struct Session *session,
1022 GNUNET_TRANSPORT_TransmitContinuation cont,
1025 struct Session* ses;
1026 struct Session* ses_temp;
1027 struct HTTP_Message * msg;
1028 struct HTTP_Message * tmp;
1031 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Transport told plugin to send to peer `%s'\n",GNUNET_i2s(target));
1033 /* find session for peer */
1034 ses = find_session_by_pi (target);
1036 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Existing session for peer `%s' found\n", GNUNET_i2s(target));
1039 /* create new session object */
1041 /*FIXME: what is const void * really? Assuming struct sockaddr_in * ! */
1042 ses = create_session((struct sockaddr_in *) addr, target);
1043 ses->is_active = GNUNET_YES;
1044 ses->transmit_cont = cont;
1046 /* Insert session into linked list */
1047 if ( plugin->sessions == NULL)
1049 plugin->sessions = ses;
1050 plugin->session_count = 1;
1052 ses_temp = plugin->sessions;
1053 while ( ses_temp->next != NULL )
1055 ses_temp = ses_temp->next;
1057 if (ses_temp != ses )
1059 ses_temp->next = ses;
1060 plugin->session_count++;
1062 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"New Session `%s' inserted, count %u \n", GNUNET_i2s(target), plugin->session_count);
1065 ses->curl_handle = curl_easy_init();
1066 if( NULL == ses->curl_handle)
1068 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Getting cURL handle failed\n");
1073 ses->transmit_cont = cont;
1075 /* setting up message */
1076 msg = GNUNET_malloc (sizeof (struct HTTP_Message));
1078 msg->len = msgbuf_size;
1080 msg->buf = GNUNET_malloc (msgbuf_size);
1081 memcpy (msg->buf,msgbuf, msgbuf_size);
1083 /* insert created message in list of pending messages */
1085 if (ses->pending_outbound_msg == NULL)
1087 ses->pending_outbound_msg = msg;
1089 tmp = ses->pending_outbound_msg;
1090 while ( NULL != tmp->next)
1097 bytes_sent = send_select_init (ses);
1105 * Function that can be used to force the plugin to disconnect
1106 * from the given peer and cancel all previous transmissions
1107 * (and their continuationc).
1109 * @param cls closure
1110 * @param target peer from which to disconnect
1113 http_plugin_disconnect (void *cls,
1114 const struct GNUNET_PeerIdentity *target)
1116 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"HTTP Plugin: http_plugin_disconnect\n");
1117 // struct Plugin *plugin = cls;
1123 * Convert the transports address to a nice, human-readable
1126 * @param cls closure
1127 * @param type name of the transport that generated the address
1128 * @param addr one of the addresses of the host, NULL for the last address
1129 * the specific address format depends on the transport
1130 * @param addrlen length of the address
1131 * @param numeric should (IP) addresses be displayed in numeric form?
1132 * @param timeout after how long should we give up?
1133 * @param asc function to call on each string
1134 * @param asc_cls closure for asc
1137 http_plugin_address_pretty_printer (void *cls,
1142 struct GNUNET_TIME_Relative timeout,
1143 GNUNET_TRANSPORT_AddressStringCallback
1146 const struct IPv4HttpAddress *t4;
1147 const struct IPv6HttpAddress *t6;
1148 struct sockaddr_in a4;
1149 struct sockaddr_in6 a6;
1154 if (addrlen == sizeof (struct IPv6HttpAddress))
1156 address = GNUNET_malloc (INET6_ADDRSTRLEN);
1158 a6.sin6_addr = t6->ipv6_addr;
1159 inet_ntop(AF_INET6, &(a6.sin6_addr),address,INET6_ADDRSTRLEN);
1160 port = ntohs(t6->u6_port);
1162 else if (addrlen == sizeof (struct IPv4HttpAddress))
1164 address = GNUNET_malloc (INET_ADDRSTRLEN);
1166 a4.sin_addr.s_addr = t4->ipv4_addr;
1167 inet_ntop(AF_INET, &(a4.sin_addr),address,INET_ADDRSTRLEN);
1168 port = ntohs(t4->u_port);
1172 /* invalid address */
1173 GNUNET_break_op (0);
1174 asc (asc_cls, NULL);
1178 ret = GNUNET_malloc(strlen(address) +14);
1179 GNUNET_asprintf(&ret,"http://%s:%u/",address,port);
1180 GNUNET_free (address);
1187 * Another peer has suggested an address for this
1188 * peer and transport plugin. Check that this could be a valid
1189 * address. If so, consider adding it to the list
1192 * @param cls closure
1193 * @param addr pointer to the address
1194 * @param addrlen length of addr
1195 * @return GNUNET_OK if this is a plausible address for this peer
1199 http_plugin_address_suggested (void *cls,
1200 void *addr, size_t addrlen)
1202 struct IPv4HttpAddress *v4;
1203 struct IPv6HttpAddress *v6;
1205 if ((addrlen != sizeof (struct IPv4HttpAddress)) &&
1206 (addrlen != sizeof (struct IPv6HttpAddress)))
1208 GNUNET_break_op (0);
1209 return GNUNET_SYSERR;
1211 if (addrlen == sizeof (struct IPv4HttpAddress))
1213 v4 = (struct IPv4HttpAddress *) addr;
1215 v4->u_port = ntohs (v4->u_port);
1216 if (v4->u_port != plugin->port_inbound)
1218 GNUNET_break_op (0);
1219 return GNUNET_SYSERR;
1224 v6 = (struct IPv6HttpAddress *) addr;
1225 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1227 GNUNET_break_op (0);
1228 return GNUNET_SYSERR;
1230 v6->u6_port = ntohs (v6->u6_port);
1231 if (v6->u6_port != plugin->port_inbound)
1233 GNUNET_break_op (0);
1234 return GNUNET_SYSERR;
1243 * Function called for a quick conversion of the binary address to
1244 * a numeric address. Note that the caller must not free the
1245 * address and that the next call to this function is allowed
1246 * to override the address again.
1248 * @param cls closure
1249 * @param addr binary address
1250 * @param addrlen length of the address
1251 * @return string representing the same address
1254 http_plugin_address_to_string (void *cls,
1258 const struct IPv4HttpAddress *t4;
1259 const struct IPv6HttpAddress *t6;
1260 struct sockaddr_in a4;
1261 struct sockaddr_in6 a6;
1266 if (addrlen == sizeof (struct IPv6HttpAddress))
1268 address = GNUNET_malloc (INET6_ADDRSTRLEN);
1270 a6.sin6_addr = t6->ipv6_addr;
1271 inet_ntop(AF_INET6, &(a6.sin6_addr),address,INET6_ADDRSTRLEN);
1272 port = ntohs(t6->u6_port);
1274 else if (addrlen == sizeof (struct IPv4HttpAddress))
1276 address = GNUNET_malloc (INET_ADDRSTRLEN);
1278 a4.sin_addr.s_addr = t4->ipv4_addr;
1279 inet_ntop(AF_INET, &(a4.sin_addr),address,INET_ADDRSTRLEN);
1280 port = ntohs(t4->u_port);
1284 /* invalid address */
1288 ret = GNUNET_malloc(strlen(address) +6);
1289 GNUNET_asprintf(&ret,"%s:%u",address,port);
1290 GNUNET_free (address);
1295 * Add the IP of our network interface to the list of
1296 * our external IP addresses.
1298 * @param cls the 'struct Plugin*'
1299 * @param name name of the interface
1300 * @param isDefault do we think this may be our default interface
1301 * @param addr address of the interface
1302 * @param addrlen number of bytes in addr
1303 * @return GNUNET_OK to continue iterating
1306 process_interfaces (void *cls,
1309 const struct sockaddr *addr, socklen_t addrlen)
1311 struct IPv4HttpAddress t4;
1312 struct IPv6HttpAddress t6;
1319 af = addr->sa_family;
1322 if (INADDR_LOOPBACK == ntohl(((struct sockaddr_in *) addr)->sin_addr.s_addr))
1324 /* skip loopback addresses */
1327 t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1328 t4.u_port = htons (plugin->port_inbound);
1332 else if (af == AF_INET6)
1334 if (IN6_IS_ADDR_LINKLOCAL (&((struct sockaddr_in6 *) addr)->sin6_addr))
1336 /* skip link local addresses */
1339 if (IN6_IS_ADDR_LOOPBACK (&((struct sockaddr_in6 *) addr)->sin6_addr))
1341 /* skip loopback addresses */
1344 memcpy (&t6.ipv6_addr,
1345 &((struct sockaddr_in6 *) addr)->sin6_addr,
1346 sizeof (struct in6_addr));
1347 t6.u6_port = htons (plugin->port_inbound);
1356 plugin->env->notify_address(plugin->env->cls,"http",arg, args, GNUNET_TIME_UNIT_FOREVER_REL);
1362 * Exit point from the plugin.
1365 libgnunet_plugin_transport_http_done (void *cls)
1367 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1368 struct Plugin *plugin = api->cls;
1369 struct Session * cs;
1370 struct Session * cs_next;
1373 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Unloading http plugin...\n");
1375 if ( http_task_v4 != GNUNET_SCHEDULER_NO_TASK)
1377 GNUNET_SCHEDULER_cancel(plugin->env->sched, http_task_v4);
1378 http_task_v4 = GNUNET_SCHEDULER_NO_TASK;
1381 if ( http_task_v6 != GNUNET_SCHEDULER_NO_TASK)
1383 GNUNET_SCHEDULER_cancel(plugin->env->sched, http_task_v6);
1384 http_task_v6 = GNUNET_SCHEDULER_NO_TASK;
1387 if ( http_task_send != GNUNET_SCHEDULER_NO_TASK)
1389 GNUNET_SCHEDULER_cancel(plugin->env->sched, http_task_send);
1390 http_task_send = GNUNET_SCHEDULER_NO_TASK;
1393 if (http_daemon_v4 != NULL)
1395 MHD_stop_daemon (http_daemon_v4);
1396 http_daemon_v4 = NULL;
1398 if (http_daemon_v6 != NULL)
1400 MHD_stop_daemon (http_daemon_v6);
1401 http_daemon_v6 = NULL;
1404 mret = curl_multi_cleanup(multi_handle);
1405 if ( CURLM_OK != mret)
1406 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"curl multihandle clean up failed");
1408 /* free all sessions */
1409 cs = plugin->sessions;
1413 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Freeing session to `%s'\n",cs->ip);
1416 /* freeing messages */
1417 struct HTTP_Message *cur;
1418 struct HTTP_Message *tmp;
1419 cur = cs->pending_outbound_msg;
1424 if (NULL != cur->buf)
1425 GNUNET_free (cur->buf);
1430 GNUNET_free (cs->ip);
1431 GNUNET_free (cs->addr);
1433 plugin->session_count--;
1438 /* GNUNET_SERVICE_stop (plugin->service); */
1439 GNUNET_free (hostname);
1440 GNUNET_free (plugin);
1447 * Entry point for the plugin.
1450 libgnunet_plugin_transport_http_init (void *cls)
1452 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1453 struct GNUNET_TRANSPORT_PluginFunctions *api;
1454 struct GNUNET_SERVICE_Context *service;
1455 unsigned int timeout;
1456 struct GNUNET_TIME_Relative gn_timeout;
1457 long long unsigned int port;
1459 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Starting http plugin...\n");
1463 service = GNUNET_SERVICE_start ("transport-http", env->sched, env->cfg);
1464 if (service == NULL)
1466 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "", _
1467 ("Failed to start service for `%s' transport plugin.\n"),
1473 plugin = GNUNET_malloc (sizeof (struct Plugin));
1475 plugin->sessions = NULL;
1476 plugin->service = service;
1477 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1479 api->send = &http_plugin_send;
1480 api->disconnect = &http_plugin_disconnect;
1481 api->address_pretty_printer = &http_plugin_address_pretty_printer;
1482 api->check_address = &http_plugin_address_suggested;
1483 api->address_to_string = &http_plugin_address_to_string;
1485 hostname = GNUNET_RESOLVER_local_fqdn_get ();
1487 /* Hashing our identity to use it in URLs */
1488 GNUNET_CRYPTO_hash_to_enc ( &(plugin->env->my_identity->hashPubKey), &my_ascii_hash_ident);
1490 /* Reading port number from config file */
1492 GNUNET_CONFIGURATION_get_value_number (env->cfg,
1498 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
1501 ("Require valid port number for transport plugin `%s' in configuration!\n"),
1503 libgnunet_plugin_transport_http_done (api);
1506 plugin->port_inbound = port;
1507 gn_timeout = GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT;
1508 timeout = ( gn_timeout.value / 1000);
1509 if ((http_daemon_v4 == NULL) && (http_daemon_v6 == NULL) && (port != 0))
1511 http_daemon_v6 = MHD_start_daemon (MHD_USE_IPv6,
1513 &acceptPolicyCallback,
1514 NULL , &accessHandlerCallback, NULL,
1515 MHD_OPTION_CONNECTION_LIMIT, (unsigned int) 16,
1516 MHD_OPTION_PER_IP_CONNECTION_LIMIT, (unsigned int) 1,
1517 MHD_OPTION_CONNECTION_TIMEOUT, timeout,
1518 /* FIXME: set correct limit */
1519 MHD_OPTION_CONNECTION_MEMORY_LIMIT, (size_t) (16 * 1024),
1520 MHD_OPTION_NOTIFY_COMPLETED, &requestCompletedCallback, NULL,
1522 http_daemon_v4 = MHD_start_daemon (MHD_NO_FLAG,
1524 &acceptPolicyCallback,
1525 NULL , &accessHandlerCallback, NULL,
1526 MHD_OPTION_CONNECTION_LIMIT, (unsigned int) 16,
1527 MHD_OPTION_PER_IP_CONNECTION_LIMIT, (unsigned int) 1,
1528 MHD_OPTION_CONNECTION_TIMEOUT, timeout,
1529 /* FIXME: set correct limit */
1530 MHD_OPTION_CONNECTION_MEMORY_LIMIT, (size_t) (16 * 1024),
1531 MHD_OPTION_NOTIFY_COMPLETED, &requestCompletedCallback, NULL,
1534 if (http_daemon_v4 != NULL)
1535 http_task_v4 = http_daemon_prepare (http_daemon_v4);
1536 if (http_daemon_v6 != NULL)
1537 http_task_v6 = http_daemon_prepare (http_daemon_v6);
1539 if (http_task_v4 != GNUNET_SCHEDULER_NO_TASK)
1540 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Starting MHD with IPv4 on port %u\n",port);
1541 if (http_task_v6 != GNUNET_SCHEDULER_NO_TASK)
1542 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Starting MHD with IPv4 and IPv6 on port %u\n",port);
1545 /* Initializing cURL */
1546 multi_handle = curl_multi_init();
1547 if ( NULL == multi_handle )
1549 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
1551 _("Could not initialize curl multi handle, failed to start http plugin!\n"),
1553 libgnunet_plugin_transport_http_done (api);
1557 GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
1562 /* end of plugin_transport_template.c */