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 "microhttpd.h"
38 #include <curl/curl.h>
40 #define DEBUG_HTTP GNUNET_NO
43 * Text of the response sent back after the last bytes of a PUT
44 * request have been received (just to formally obey the HTTP
47 #define HTTP_PUT_RESPONSE "Thank you!"
50 * After how long do we expire an address that we
51 * learned from another peer if it is not reconfirmed
54 #define LEARNED_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 6)
57 * Page returned if request invalid
59 #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>"
62 * Timeout for a http connect
64 #define HTTP_CONNECT_TIMEOUT 30
68 * Encapsulation of all of the state of the plugin.
73 * Message to send using http
78 * Next field for linked list
80 struct HTTP_Message * next;
83 * buffer containing data to send
88 * amount of data already sent
93 * amount of data to sent
102 * Session handle for connections.
108 * Stored in a linked list.
110 struct Session *next;
113 * Pointer to the global plugin struct.
115 struct Plugin *plugin;
118 * Continuation function to call once the transmission buffer
119 * has again space available. NULL if there is no
120 * continuation to call.
122 GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
125 * Closure for transmit_cont.
127 void *transmit_cont_cls;
130 * To whom are we talking to (set to our identity
131 * if we are still waiting for the welcome message)
133 struct GNUNET_PeerIdentity sender;
141 * Sender's ip address to distinguish between incoming connections
146 * Sender's ip address to distinguish between incoming connections
148 struct sockaddr_in * addr;
151 * Did we initiate the connection (GNUNET_YES) or the other peer (GNUNET_NO)?
153 unsigned int is_client;
156 * Is the connection active (GNUNET_YES) or terminated (GNUNET_NO)?
158 unsigned int is_active;
161 * At what time did we reset last_received last?
163 struct GNUNET_TIME_Absolute last_quota_update;
166 * How many bytes have we received since the "last_quota_update"
169 uint64_t last_received;
172 * Number of bytes per ms that this peer is allowed
178 * Is there a HTTP/PUT in progress?
180 unsigned int is_put_in_progress;
185 struct GNUNET_CRYPTO_HashAsciiEncoded hash;
187 struct HTTP_Message * pending_outbound_msg;;
193 * Encapsulation of all of the state of the plugin.
200 struct GNUNET_TRANSPORT_PluginEnvironment *env;
203 * Handle to the network service.
205 struct GNUNET_SERVICE_Context *service;
208 * List of open sessions.
210 struct Session *sessions;
213 * Number of active sessions
216 unsigned int session_count;
220 * Daemon for listening for new IPv4 connections.
222 static struct MHD_Daemon *http_daemon_v4;
225 * Daemon for listening for new IPv6connections.
227 static struct MHD_Daemon *http_daemon_v6;
230 * Our primary task for http daemon handling IPv4 connections
232 static GNUNET_SCHEDULER_TaskIdentifier http_task_v4;
235 * Our primary task for http daemon handling IPv6 connections
237 static GNUNET_SCHEDULER_TaskIdentifier http_task_v6;
241 * Our primary task for http daemon handling IPv6 connections
243 static GNUNET_SCHEDULER_TaskIdentifier http_task_send;
247 * Information about this plugin
249 static struct Plugin *plugin;
254 static CURLM *multi_handle;
259 static char * hostname;
262 * Our ASCII encoded, hashed peer identity
263 * This string is used to distinguish between connections and is added to the urls
265 static struct GNUNET_CRYPTO_HashAsciiEncoded my_ascii_hash_ident;
267 struct GNUNET_TIME_Relative timeout;
270 * Finds a http session in our linked list using peer identity as a key
271 * @param peer peeridentity
272 * @return http session corresponding to peer identity
274 static struct Session * find_session_by_pi( const struct GNUNET_PeerIdentity *peer )
276 struct Session * cur;
277 GNUNET_HashCode hc_peer;
278 GNUNET_HashCode hc_current;
280 cur = plugin->sessions;
281 hc_peer = peer->hashPubKey;
284 hc_current = cur->sender.hashPubKey;
285 if ( 0 == GNUNET_CRYPTO_hash_cmp( &hc_peer, &hc_current))
287 cur = plugin->sessions->next;
293 * Finds a http session in our linked list using libcurl handle as a key
294 * Needed when sending data with libcurl to differentiate between sessions
295 * @param peer peeridentity
296 * @return http session corresponding to peer identity
298 static struct Session * find_session_by_curlhandle( CURL* handle )
300 struct Session * cur;
302 cur = plugin->sessions;
305 if ( handle == cur->curl_handle )
307 cur = plugin->sessions->next;
313 * Create a new session
315 * @param address address the peer is using
316 * @peer peer identity
317 * @return created session object
319 static struct Session * create_session (struct sockaddr_in *address, const struct GNUNET_PeerIdentity *peer)
321 struct sockaddr_in *addrin;
322 struct sockaddr_in6 *addrin6;
324 struct Session * ses = GNUNET_malloc ( sizeof( struct Session) );
325 ses->addr = GNUNET_malloc ( sizeof (struct sockaddr_in) );
328 ses->plugin = plugin;
330 memcpy(ses->addr, address, sizeof (struct sockaddr_in));
331 if ( AF_INET == address->sin_family)
333 ses->ip = GNUNET_malloc (INET_ADDRSTRLEN);
335 inet_ntop(addrin->sin_family,&(addrin->sin_addr),ses->ip,INET_ADDRSTRLEN);
337 if ( AF_INET6 == address->sin_family)
339 ses->ip = GNUNET_malloc (INET6_ADDRSTRLEN);
340 addrin6 = (struct sockaddr_in6 *) address;
341 inet_ntop(addrin6->sin6_family, &(addrin6->sin6_addr) ,ses->ip,INET6_ADDRSTRLEN);
343 memcpy(&ses->sender, peer, sizeof (struct GNUNET_PeerIdentity));
344 GNUNET_CRYPTO_hash_to_enc(&ses->sender.hashPubKey,&(ses->hash));
345 ses->is_active = GNUNET_NO;
351 * Callback called by MHD when a connection is terminated
353 static void requestCompletedCallback (void *cls, struct MHD_Connection * connection, void **httpSessionCache)
357 cs = *httpSessionCache;
360 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection from peer `%s' was terminated\n",GNUNET_i2s(&cs->sender));
361 /* session set to inactive */
362 cs->is_active = GNUNET_NO;
363 cs->is_put_in_progress = GNUNET_NO;
369 * Check if we are allowed to connect to the given IP.
372 acceptPolicyCallback (void *cls,
373 const struct sockaddr *addr, socklen_t addr_len)
375 /* Every connection is accepted, nothing more to do here */
381 * Process GET or PUT request received via MHD. For
382 * GET, queue response that will send back our pending
383 * messages. For PUT, process incoming data and send
384 * to GNUnet core. In either case, check if a session
385 * already exists and create a new one if not.
388 accessHandlerCallback (void *cls,
389 struct MHD_Connection *session,
393 const char *upload_data,
394 size_t * upload_data_size, void **httpSessionCache)
396 struct MHD_Response *response;
398 struct Session * cs_temp;
399 const union MHD_ConnectionInfo * conn_info;
400 struct sockaddr_in *addrin;
401 struct sockaddr_in6 *addrin6;
402 char * address = NULL;
403 struct GNUNET_PeerIdentity pi_in;
406 struct GNUNET_MessageHeader *gn_msg;
407 int send_error_to_client;
410 send_error_to_client = GNUNET_NO;
411 if ( NULL == *httpSessionCache)
413 /* check url for peer identity */
414 res = GNUNET_CRYPTO_hash_from_string ( &url[1], &(pi_in.hashPubKey));
415 if ( GNUNET_SYSERR == res )
417 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Peer has no valid ident\n");
418 response = MHD_create_response_from_data (strlen (HTTP_ERROR_RESPONSE),HTTP_ERROR_RESPONSE, MHD_NO, MHD_NO);
419 res = MHD_queue_response (session, MHD_HTTP_NOT_FOUND, response);
420 MHD_destroy_response (response);
424 conn_info = MHD_get_connection_info(session, MHD_CONNECTION_INFO_CLIENT_ADDRESS );
425 /* Incoming IPv4 connection */
426 if ( AF_INET == conn_info->client_addr->sin_family)
428 address = GNUNET_malloc (INET_ADDRSTRLEN);
429 addrin = conn_info->client_addr;
430 inet_ntop(addrin->sin_family, &(addrin->sin_addr),address,INET_ADDRSTRLEN);
432 /* Incoming IPv6 connection */
433 if ( AF_INET6 == conn_info->client_addr->sin_family)
435 address = GNUNET_malloc (INET6_ADDRSTRLEN);
436 addrin6 = (struct sockaddr_in6 *) conn_info->client_addr;
437 inet_ntop(addrin6->sin6_family, &(addrin6->sin6_addr),address,INET6_ADDRSTRLEN);
439 /* find existing session for address */
441 if (plugin->session_count > 0)
443 cs = plugin->sessions;
447 /* Comparison based on ip address */
448 // res = (0 == memcmp(&(conn_info->client_addr->sin_addr),&(cs->addr->sin_addr), sizeof (struct in_addr))) ? GNUNET_YES : GNUNET_NO;
450 /* Comparison based on ip address, port number and address family */
451 // res = (0 == memcmp((conn_info->client_addr),(cs->addr), sizeof (struct sockaddr_in))) ? GNUNET_YES : GNUNET_NO;
453 /* Comparison based on PeerIdentity */
454 res = (0 == memcmp(&pi_in,&(cs->sender), sizeof (struct GNUNET_PeerIdentity))) ? GNUNET_YES : GNUNET_NO;
456 if ( GNUNET_YES == res)
458 /* existing session for this address found */
459 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Session `%s' found\n",address);
465 /* no existing session, create a new one*/
468 /* create new session object */
469 cs = create_session(conn_info->client_addr, &pi_in);
471 /* Insert session into linked list */
472 if ( plugin->sessions == NULL)
474 plugin->sessions = cs;
475 plugin->session_count = 1;
477 cs_temp = plugin->sessions;
478 while ( cs_temp->next != NULL )
480 cs_temp = cs_temp->next;
485 plugin->session_count++;
487 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"New Session `%s' inserted, count %u \n", address, plugin->session_count);
490 if (*httpSessionCache == NULL)
492 *httpSessionCache = cs;
494 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);
498 cs = *httpSessionCache;
500 /* Is it a PUT or a GET request */
501 if ( 0 == strcmp (MHD_HTTP_METHOD_PUT, method) )
504 if ((*upload_data_size == 0) && (cs->is_put_in_progress == GNUNET_NO))
507 cs->is_put_in_progress = GNUNET_YES;
508 cs->is_active = GNUNET_YES;
511 if ( *upload_data_size > 0 )
513 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"PUT URL: `%s'\n",url);
514 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"PUT Request: %lu bytes: `%s' \n", (*upload_data_size), upload_data);
516 bytes_recv = *upload_data_size ;
517 *upload_data_size = 0;
520 if (bytes_recv < sizeof (struct GNUNET_MessageHeader))
522 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));
523 send_error_to_client = GNUNET_YES;
526 if ( bytes_recv > GNUNET_SERVER_MAX_MESSAGE_SIZE)
528 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Message too big, is %u bytes, maximum %u '\n",bytes_recv, GNUNET_SERVER_MAX_MESSAGE_SIZE);
529 send_error_to_client = GNUNET_YES;
532 struct GNUNET_MessageHeader * gn_msg = GNUNET_malloc (bytes_recv);
533 memcpy (gn_msg,upload_data,bytes_recv);
535 if ( ntohs(gn_msg->size) != bytes_recv )
537 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Message has incorrect size, is %u bytes vs %u recieved'\n",ntohs(gn_msg->size) , bytes_recv);
538 send_error_to_client = GNUNET_YES;
541 if ( GNUNET_YES == send_error_to_client)
543 response = MHD_create_response_from_data (strlen (HTTP_PUT_RESPONSE),HTTP_PUT_RESPONSE, MHD_NO, MHD_NO);
544 res = MHD_queue_response (session, MHD_HTTP_BAD_REQUEST, response);
545 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 );
546 MHD_destroy_response (response);
547 GNUNET_free (gn_msg);
550 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));
552 /* forwarding message to transport */
553 plugin->env->receive(plugin->env, &(cs->sender), gn_msg, 1, cs , cs->ip, strlen(cs->ip) );
556 if ((*upload_data_size == 0) && (cs->is_put_in_progress == GNUNET_YES))
558 cs->is_put_in_progress = GNUNET_NO;
559 response = MHD_create_response_from_data (strlen (HTTP_PUT_RESPONSE),HTTP_PUT_RESPONSE, MHD_NO, MHD_NO);
560 res = MHD_queue_response (session, MHD_HTTP_OK, response);
561 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Sent HTTP/1.1: 200 OK as PUT Response\n",HTTP_PUT_RESPONSE, strlen (HTTP_PUT_RESPONSE), res );
562 MHD_destroy_response (response);
566 if ( 0 == strcmp (MHD_HTTP_METHOD_GET, method) )
568 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Got GET Request\n");
569 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"URL: `%s'\n",url);
570 response = MHD_create_response_from_data (strlen (HTTP_PUT_RESPONSE),HTTP_PUT_RESPONSE, MHD_NO, MHD_NO);
571 res = MHD_queue_response (session, MHD_HTTP_OK, response);
572 MHD_destroy_response (response);
580 * Call MHD to process pending requests and then go back
581 * and schedule the next run.
583 static void http_daemon_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
586 * Function that queries MHD's select sets and
587 * starts the task waiting for them.
589 static GNUNET_SCHEDULER_TaskIdentifier
590 http_daemon_prepare (struct MHD_Daemon *daemon_handle)
592 GNUNET_SCHEDULER_TaskIdentifier ret;
596 struct GNUNET_NETWORK_FDSet *wrs;
597 struct GNUNET_NETWORK_FDSet *wws;
598 struct GNUNET_NETWORK_FDSet *wes;
600 unsigned long long timeout;
602 struct GNUNET_TIME_Relative tv;
607 wrs = GNUNET_NETWORK_fdset_create ();
608 wes = GNUNET_NETWORK_fdset_create ();
609 wws = GNUNET_NETWORK_fdset_create ();
611 GNUNET_assert (MHD_YES ==
612 MHD_get_fdset (daemon_handle,
617 haveto = MHD_get_timeout (daemon_handle, &timeout);
618 if (haveto == MHD_YES)
619 tv.value = (uint64_t) timeout;
621 tv = GNUNET_TIME_UNIT_FOREVER_REL;
622 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max);
623 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max);
624 GNUNET_NETWORK_fdset_copy_native (wes, &es, max);
625 ret = GNUNET_SCHEDULER_add_select (plugin->env->sched,
626 GNUNET_SCHEDULER_PRIORITY_HIGH,
627 GNUNET_SCHEDULER_NO_TASK,
633 GNUNET_NETWORK_fdset_destroy (wrs);
634 GNUNET_NETWORK_fdset_destroy (wws);
635 GNUNET_NETWORK_fdset_destroy (wes);
640 * Call MHD to process pending requests and then go back
641 * and schedule the next run.
643 static void http_daemon_run (void *cls,
644 const struct GNUNET_SCHEDULER_TaskContext *tc)
646 struct MHD_Daemon *daemon_handle = cls;
648 if (daemon_handle == http_daemon_v4)
649 http_task_v4 = GNUNET_SCHEDULER_NO_TASK;
651 if (daemon_handle == http_daemon_v6)
652 http_task_v6 = GNUNET_SCHEDULER_NO_TASK;
654 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
657 GNUNET_assert (MHD_YES == MHD_run (daemon_handle));
658 if (daemon_handle == http_daemon_v4)
659 http_task_v4 = http_daemon_prepare (daemon_handle);
660 if (daemon_handle == http_daemon_v6)
661 http_task_v6 = http_daemon_prepare (daemon_handle);
666 * Removes a message from the linked list of messages
667 * @param ses session to remove message from
668 * @param msg message to remove
669 * @return GNUNET_SYSERR if msg not found, GNUNET_OK on success
672 static int remove_http_message(struct Session * ses, struct HTTP_Message * msg)
674 struct HTTP_Message * cur;
675 struct HTTP_Message * next;
677 cur = ses->pending_outbound_msg;
681 return GNUNET_SYSERR;
685 ses->pending_outbound_msg = cur->next;
686 GNUNET_free (cur->buf);
692 while (cur->next!=msg)
694 if (cur->next != NULL)
697 return GNUNET_SYSERR;
700 cur->next = cur->next->next;
701 GNUNET_free (cur->next->buf);
702 GNUNET_free (cur->next);
709 * Callback method used with libcurl
710 * Method is called when libcurl needs to read data during sending
711 * @param stream pointer where to write data
712 * @param size_t size of an individual element
713 * @param nmemb count of elements that can be written to the buffer
714 * @param ptr source pointer, passed to the libcurl handle
715 * @return bytes written to stream
717 static size_t send_read_callback(void *stream, size_t size, size_t nmemb, void *ptr)
719 struct Session * ses = ptr;
720 struct HTTP_Message * msg = ses->pending_outbound_msg;
721 unsigned int bytes_sent;
724 if (msg->len > (size * nmemb))
725 return CURL_READFUNC_ABORT;
727 if (( msg->pos < msg->len) && (msg->len < (size * nmemb)))
729 memcpy(stream, msg->buf, msg->len);
731 bytes_sent = msg->len;
738 * Callback method used with libcurl
739 * Method is called when libcurl needs to write data during sending
740 * @param stream pointer where to write data
741 * @param size_t size of an individual element
742 * @param nmemb count of elements that can be written to the buffer
743 * @param ptr destination pointer, passed to the libcurl handle
744 * @return bytes read from stream
746 static size_t send_write_callback( void *stream, size_t size, size_t nmemb, void *ptr)
748 char * data = malloc(size*nmemb +1);
750 memcpy( data, stream, size*nmemb);
751 data[size*nmemb] = '\0';
752 /* Just a dummy print for the response recieved for the PUT message */
753 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Recieved %u bytes: `%s' \n", size * nmemb, data);
755 return (size * nmemb);
760 * Function setting up file descriptors and scheduling task to run
761 * @param ses session to send data to
762 * @return bytes sent to peer
764 static size_t send_prepare(struct Session* session );
767 * Function setting up curl handle and selecting message to send
768 * @param ses session to send data to
769 * @return bytes sent to peer
771 static ssize_t send_select_init (struct Session* ses )
776 struct HTTP_Message * msg;
778 /* FIFO selection, send oldest msg first, perhaps priority here? */
779 msg = ses->pending_outbound_msg;
781 url = GNUNET_malloc( 7 + strlen(ses->ip) + 7 + strlen ((char *) &(ses->hash)) + 1);
782 /* FIXME: use correct port number */
783 GNUNET_asprintf(&url,"http://%s:%u/%s",ses->ip,12389, (char *) &(ses->hash));
785 /* curl_easy_setopt(ses->curl_handle, CURLOPT_VERBOSE, 1L); */
786 curl_easy_setopt(ses->curl_handle, CURLOPT_URL, url);
787 curl_easy_setopt(ses->curl_handle, CURLOPT_PUT, 1L);
788 curl_easy_setopt(ses->curl_handle, CURLOPT_READFUNCTION, send_read_callback);
789 curl_easy_setopt(ses->curl_handle, CURLOPT_READDATA, ses);
790 curl_easy_setopt(ses->curl_handle, CURLOPT_WRITEFUNCTION, send_write_callback);
791 curl_easy_setopt(ses->curl_handle, CURLOPT_READDATA, ses);
792 curl_easy_setopt(ses->curl_handle, CURLOPT_INFILESIZE_LARGE, (curl_off_t) msg->len);
793 curl_easy_setopt(ses->curl_handle, CURLOPT_TIMEOUT, (timeout.value / 1000 ));
794 curl_easy_setopt(ses->curl_handle, CURLOPT_CONNECTTIMEOUT, HTTP_CONNECT_TIMEOUT);
796 mret = curl_multi_add_handle(multi_handle, ses->curl_handle);
797 if (mret != CURLM_OK)
799 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
800 _("%s failed at %s:%d: `%s'\n"),
801 "curl_multi_add_handle", __FILE__, __LINE__,
802 curl_multi_strerror (mret));
805 bytes_sent = send_prepare (ses );
810 static void send_execute (void *cls,
811 const struct GNUNET_SCHEDULER_TaskContext *tc)
816 struct Session * cs = NULL;
818 http_task_send = GNUNET_SCHEDULER_NO_TASK;
819 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
825 mret = curl_multi_perform (multi_handle, &running);
831 msg = curl_multi_info_read (multi_handle, &running);
832 GNUNET_break (msg != NULL);
835 /* get session for affected curl handle */
836 cs = find_session_by_curlhandle (msg->easy_handle);
837 GNUNET_assert ( cs != NULL );
842 if ( (msg->data.result != CURLE_OK) &&
843 (msg->data.result != CURLE_GOT_NOTHING) )
846 GNUNET_log(GNUNET_ERROR_TYPE_INFO,
847 _("%s failed for `%s' at %s:%d: `%s'\n"),
848 "curl_multi_perform",
852 curl_easy_strerror (msg->data.result));
853 /* sending msg failed*/
854 if ( NULL != cs->transmit_cont)
855 cs->transmit_cont (NULL,&cs->sender,GNUNET_SYSERR);
859 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
860 "Send to %s completed.\n", cs->ip);
861 if (GNUNET_OK != remove_http_message(cs, cs->pending_outbound_msg))
862 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message could not be removed from session `%s'", GNUNET_i2s(&cs->sender));
864 curl_easy_cleanup(cs->curl_handle);
865 cs->curl_handle=NULL;
867 /* send pending messages */
868 if (cs->pending_outbound_msg != NULL)
869 send_select_init (cs);
871 /* Calling transmit continuation */
872 if ( NULL != cs->transmit_cont)
873 cs->transmit_cont (NULL,&cs->sender,GNUNET_OK);
881 while ( (running > 0) );
884 while (mret == CURLM_CALL_MULTI_PERFORM);
890 * Function setting up file descriptors and scheduling task to run
891 * @param ses session to send data to
892 * @return bytes sent to peer
894 static size_t send_prepare(struct Session* session )
900 struct GNUNET_NETWORK_FDSet *grs;
901 struct GNUNET_NETWORK_FDSet *gws;
909 mret = curl_multi_fdset (multi_handle, &rs, &ws, &es, &max);
910 if (mret != CURLM_OK)
912 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
913 _("%s failed at %s:%d: `%s'\n"),
914 "curl_multi_fdset", __FILE__, __LINE__,
915 curl_multi_strerror (mret));
918 mret = curl_multi_timeout (multi_handle, &to);
919 if (mret != CURLM_OK)
921 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
922 _("%s failed at %s:%d: `%s'\n"),
923 "curl_multi_timeout", __FILE__, __LINE__,
924 curl_multi_strerror (mret));
928 grs = GNUNET_NETWORK_fdset_create ();
929 gws = GNUNET_NETWORK_fdset_create ();
930 GNUNET_NETWORK_fdset_copy_native (grs, &rs, max + 1);
931 GNUNET_NETWORK_fdset_copy_native (gws, &ws, max + 1);
932 http_task_send = GNUNET_SCHEDULER_add_select (plugin->env->sched,
933 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
934 GNUNET_SCHEDULER_NO_TASK,
935 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 0),
940 GNUNET_NETWORK_fdset_destroy (gws);
941 GNUNET_NETWORK_fdset_destroy (grs);
943 /* FIXME: return bytes REALLY sent */
948 * Function that can be used by the transport service to transmit
949 * a message using the plugin.
952 * @param target who should receive this message
953 * @param priority how important is the message
954 * @param msgbuf the message to transmit
955 * @param msgbuf_size number of bytes in 'msgbuf'
956 * @param timeout when should we time out
957 * @param session which session must be used (or NULL for "any")
958 * @param addr the address to use (can be NULL if the plugin
959 * is "on its own" (i.e. re-use existing TCP connection))
960 * @param addrlen length of the address in bytes
961 * @param force_address GNUNET_YES if the plugin MUST use the given address,
962 * otherwise the plugin may use other addresses or
963 * existing connections (if available)
964 * @param cont continuation to call once the message has
965 * been transmitted (or if the transport is ready
966 * for the next transmission call; or if the
967 * peer disconnected...)
968 * @param cont_cls closure for cont
969 * @return number of bytes used (on the physical network, with overheads);
970 * -1 on hard errors (i.e. address invalid); 0 is a legal value
971 * and does NOT mean that the message was not transmitted (DV)
974 http_plugin_send (void *cls,
975 const struct GNUNET_PeerIdentity *target,
978 unsigned int priority,
979 struct GNUNET_TIME_Relative to,
980 struct Session *session,
984 GNUNET_TRANSPORT_TransmitContinuation cont,
988 struct Session* ses_temp;
989 struct HTTP_Message * msg;
990 struct HTTP_Message * tmp;
993 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Transport told plugin to send to peer `%s'\n",GNUNET_i2s(target));
995 /* find session for peer */
996 ses = find_session_by_pi (target);
998 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Existing session for peer `%s' found\n", GNUNET_i2s(target));
1001 /* create new session object */
1003 /*FIXME: what is const void * really? Assuming struct sockaddr_in * ! */
1004 ses = create_session((struct sockaddr_in *) addr, target);
1005 ses->is_active = GNUNET_YES;
1006 ses->transmit_cont = cont;
1008 /* Insert session into linked list */
1009 if ( plugin->sessions == NULL)
1011 plugin->sessions = ses;
1012 plugin->session_count = 1;
1014 ses_temp = plugin->sessions;
1015 while ( ses_temp->next != NULL )
1017 ses_temp = ses_temp->next;
1019 if (ses_temp != ses )
1021 ses_temp->next = ses;
1022 plugin->session_count++;
1024 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"New Session `%s' inserted, count %u \n", GNUNET_i2s(target), plugin->session_count);
1027 ses->curl_handle = curl_easy_init();
1028 if( NULL == ses->curl_handle)
1030 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Getting cURL handle failed\n");
1035 ses->transmit_cont = cont;
1037 /* setting up message */
1038 msg = GNUNET_malloc (sizeof (struct HTTP_Message));
1040 msg->len = msgbuf_size;
1042 msg->buf = GNUNET_malloc (msgbuf_size);
1043 memcpy (msg->buf,msgbuf, msgbuf_size);
1045 /* insert created message in list of pending messages */
1047 if (ses->pending_outbound_msg == NULL)
1049 ses->pending_outbound_msg = msg;
1051 tmp = ses->pending_outbound_msg;
1052 while ( NULL != tmp->next)
1059 bytes_sent = send_select_init (ses);
1067 * Function that can be used to force the plugin to disconnect
1068 * from the given peer and cancel all previous transmissions
1069 * (and their continuationc).
1071 * @param cls closure
1072 * @param target peer from which to disconnect
1075 http_plugin_disconnect (void *cls,
1076 const struct GNUNET_PeerIdentity *target)
1078 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"HTTP Plugin: http_plugin_disconnect\n");
1079 // struct Plugin *plugin = cls;
1085 * Convert the transports address to a nice, human-readable
1088 * @param cls closure
1089 * @param type name of the transport that generated the address
1090 * @param addr one of the addresses of the host, NULL for the last address
1091 * the specific address format depends on the transport
1092 * @param addrlen length of the address
1093 * @param numeric should (IP) addresses be displayed in numeric form?
1094 * @param timeout after how long should we give up?
1095 * @param asc function to call on each string
1096 * @param asc_cls closure for asc
1099 http_plugin_address_pretty_printer (void *cls,
1104 struct GNUNET_TIME_Relative timeout,
1105 GNUNET_TRANSPORT_AddressStringCallback
1108 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"HTTP Plugin: http_plugin_address_pretty_printer\n");
1109 asc (asc_cls, NULL);
1115 * Another peer has suggested an address for this
1116 * peer and transport plugin. Check that this could be a valid
1117 * address. If so, consider adding it to the list
1120 * @param cls closure
1121 * @param addr pointer to the address
1122 * @param addrlen length of addr
1123 * @return GNUNET_OK if this is a plausible address for this peer
1127 http_plugin_address_suggested (void *cls,
1128 void *addr, size_t addrlen)
1130 /* struct Plugin *plugin = cls; */
1132 /* check if the address is plausible; if so,
1133 add it to our list! */
1134 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"HTTP Plugin: http_plugin_address_suggested\n");
1140 * Function called for a quick conversion of the binary address to
1141 * a numeric address. Note that the caller must not free the
1142 * address and that the next call to this function is allowed
1143 * to override the address again.
1145 * @param cls closure
1146 * @param addr binary address
1147 * @param addrlen length of the address
1148 * @return string representing the same address
1151 http_plugin_address_to_string (void *cls,
1155 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"HTTP Plugin: http_plugin_address_to_string\n");
1161 * Exit point from the plugin.
1164 libgnunet_plugin_transport_http_done (void *cls)
1166 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1167 struct Plugin *plugin = api->cls;
1168 struct Session * cs;
1169 struct Session * cs_next;
1172 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Unloading http plugin...\n");
1174 if ( http_task_v4 != GNUNET_SCHEDULER_NO_TASK)
1176 GNUNET_SCHEDULER_cancel(plugin->env->sched, http_task_v4);
1177 http_task_v4 = GNUNET_SCHEDULER_NO_TASK;
1180 if ( http_task_v6 != GNUNET_SCHEDULER_NO_TASK)
1182 GNUNET_SCHEDULER_cancel(plugin->env->sched, http_task_v6);
1183 http_task_v6 = GNUNET_SCHEDULER_NO_TASK;
1186 if ( http_task_send != GNUNET_SCHEDULER_NO_TASK)
1188 GNUNET_SCHEDULER_cancel(plugin->env->sched, http_task_send);
1189 http_task_send = GNUNET_SCHEDULER_NO_TASK;
1192 if (http_daemon_v4 != NULL)
1194 MHD_stop_daemon (http_daemon_v4);
1195 http_daemon_v4 = NULL;
1197 if (http_daemon_v6 != NULL)
1199 MHD_stop_daemon (http_daemon_v6);
1200 http_daemon_v6 = NULL;
1203 mret = curl_multi_cleanup(multi_handle);
1204 if ( CURLM_OK != mret)
1205 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"curl multihandle clean up failed");
1207 /* free all sessions */
1208 cs = plugin->sessions;
1212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Freeing session to `%s'\n",cs->ip);
1215 /* freeing messages */
1216 struct HTTP_Message *cur;
1217 struct HTTP_Message *tmp;
1218 cur = cs->pending_outbound_msg;
1223 if (NULL != cur->buf)
1224 GNUNET_free (cur->buf);
1229 GNUNET_free (cs->ip);
1230 GNUNET_free (cs->addr);
1232 plugin->session_count--;
1237 /* GNUNET_SERVICE_stop (plugin->service); */
1238 GNUNET_free (hostname);
1239 GNUNET_free (plugin);
1246 * Entry point for the plugin.
1249 libgnunet_plugin_transport_http_init (void *cls)
1251 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1252 struct GNUNET_TRANSPORT_PluginFunctions *api;
1253 struct GNUNET_SERVICE_Context *service;
1254 unsigned int timeout;
1255 struct GNUNET_TIME_Relative gn_timeout;
1256 long long unsigned int port;
1258 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Starting http plugin...\n");
1262 service = GNUNET_SERVICE_start ("transport-http", env->sched, env->cfg);
1263 if (service == NULL)
1265 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "", _
1266 ("Failed to start service for `%s' transport plugin.\n"),
1272 plugin = GNUNET_malloc (sizeof (struct Plugin));
1274 plugin->sessions = NULL;
1275 plugin->service = service;
1276 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1278 api->send = &http_plugin_send;
1279 api->disconnect = &http_plugin_disconnect;
1280 api->address_pretty_printer = &http_plugin_address_pretty_printer;
1281 api->check_address = &http_plugin_address_suggested;
1282 api->address_to_string = &http_plugin_address_to_string;
1284 hostname = GNUNET_RESOLVER_local_fqdn_get ();
1286 /* Hashing our identity to use it in URLs */
1287 GNUNET_CRYPTO_hash_to_enc ( &(plugin->env->my_identity->hashPubKey), &my_ascii_hash_ident);
1289 /* Reading port number from config file */
1291 GNUNET_CONFIGURATION_get_value_number (env->cfg,
1297 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
1300 ("Require valid port number for transport plugin `%s' in configuration!\n"),
1302 libgnunet_plugin_transport_http_done (api);
1306 gn_timeout = GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT;
1307 timeout = ( gn_timeout.value / 1000);
1308 if ((http_daemon_v4 == NULL) && (http_daemon_v6 == NULL) && (port != 0))
1310 http_daemon_v6 = MHD_start_daemon (MHD_USE_IPv6,
1312 &acceptPolicyCallback,
1313 NULL , &accessHandlerCallback, NULL,
1314 MHD_OPTION_CONNECTION_LIMIT, (unsigned int) 16,
1315 MHD_OPTION_PER_IP_CONNECTION_LIMIT, (unsigned int) 1,
1316 MHD_OPTION_CONNECTION_TIMEOUT, timeout,
1317 /* FIXME: set correct limit */
1318 MHD_OPTION_CONNECTION_MEMORY_LIMIT, (size_t) (16 * 1024),
1319 MHD_OPTION_NOTIFY_COMPLETED, &requestCompletedCallback, NULL,
1321 http_daemon_v4 = MHD_start_daemon (MHD_NO_FLAG,
1323 &acceptPolicyCallback,
1324 NULL , &accessHandlerCallback, NULL,
1325 MHD_OPTION_CONNECTION_LIMIT, (unsigned int) 16,
1326 MHD_OPTION_PER_IP_CONNECTION_LIMIT, (unsigned int) 1,
1327 MHD_OPTION_CONNECTION_TIMEOUT, timeout,
1328 /* FIXME: set correct limit */
1329 MHD_OPTION_CONNECTION_MEMORY_LIMIT, (size_t) (16 * 1024),
1330 MHD_OPTION_NOTIFY_COMPLETED, &requestCompletedCallback, NULL,
1333 if (http_daemon_v4 != NULL)
1334 http_task_v4 = http_daemon_prepare (http_daemon_v4);
1335 if (http_daemon_v6 != NULL)
1336 http_task_v6 = http_daemon_prepare (http_daemon_v6);
1338 if (http_task_v4 != GNUNET_SCHEDULER_NO_TASK)
1339 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Starting MHD with IPv4 on port %u\n",port);
1340 if (http_task_v6 != GNUNET_SCHEDULER_NO_TASK)
1341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Starting MHD with IPv4 and IPv6 on port %u\n",port);
1343 /* Initializing cURL */
1344 multi_handle = curl_multi_init();
1345 if ( NULL == multi_handle )
1347 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
1349 _("Could not initialize curl multi handle, failed to start http plugin!\n"),
1351 libgnunet_plugin_transport_http_done (api);
1357 /* end of plugin_transport_template.c */