/* This file is part of GNUnet (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors) GNUnet is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GNUnet is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNUnet; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /** * @file transport/plugin_transport_http_client.c * @brief HTTP/S client transport plugin * @author Matthias Wachs */ #if BUILD_HTTPS #define PLUGIN_NAME "https_client" #define LIBGNUNET_PLUGIN_TRANSPORT_INIT libgnunet_plugin_transport_https_client_init #define LIBGNUNET_PLUGIN_TRANSPORT_DONE libgnunet_plugin_transport_https_client_done #else #define PLUGIN_NAME "http_client" #define LIBGNUNET_PLUGIN_TRANSPORT_INIT libgnunet_plugin_transport_http_client_init #define LIBGNUNET_PLUGIN_TRANSPORT_DONE libgnunet_plugin_transport_http_client_done #endif #define VERBOSE_CURL GNUNET_YES #define PUT_DISCONNECT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1) #define ENABLE_PUT GNUNET_YES #define ENABLE_GET GNUNET_YES #include "platform.h" #include "gnunet_util_lib.h" #include "gnunet_protocols.h" #include "gnunet_transport_plugin.h" #include "plugin_transport_http_common.h" #include /** * Encapsulation of all of the state of the plugin. */ struct HTTP_Client_Plugin; /** * Message to send using http */ struct HTTP_Message { /** * next pointer for double linked list */ struct HTTP_Message *next; /** * previous pointer for double linked list */ struct HTTP_Message *prev; /** * buffer containing data to send */ char *buf; /** * amount of data already sent */ size_t pos; /** * buffer length */ size_t size; /** * Continuation function to call once the transmission buffer * has again space available. NULL if there is no * continuation to call. */ GNUNET_TRANSPORT_TransmitContinuation transmit_cont; /** * Closure for transmit_cont. */ void *transmit_cont_cls; }; /** * Session handle for connections. */ struct Session; /** * A connection handle * */ struct ConnectionHandle { /** * The curl easy handle */ CURL *easyhandle; /** * The related session */ struct Session *s; }; /** * Session handle for connections. */ struct Session { /** * To whom are we talking to (set to our identity * if we are still waiting for the welcome message) */ struct GNUNET_PeerIdentity target; /** * Stored in a linked list. */ struct Session *next; /** * Stored in a linked list. */ struct Session *prev; /** * The URL to connect to */ char *url; /** * Address */ struct HttpAddress *addr; /** * Address length */ size_t addrlen; /** * ATS network type in NBO */ uint32_t ats_address_network_type; /** * Pointer to the global plugin struct. */ struct HTTP_Client_Plugin *plugin; /** * Client send handle */ void *client_put; struct ConnectionHandle put; struct ConnectionHandle get; /** * Is the client PUT handle currently paused */ int put_paused; /** * Is the client PUT handle disconnect in progress? */ int put_tmp_disconnecting; /** * Is the client PUT handle temporarily disconnected? */ int put_tmp_disconnected; /** * We received data to send while disconnecting, reconnect immediately */ int put_reconnect_required; /** * Client receive handle */ void *client_get; /** * Outbound overhead due to HTTP connection * Add to next message of this session when calling callback */ size_t overhead; /** * next pointer for double linked list */ struct HTTP_Message *msg_head; /** * previous pointer for double linked list */ struct HTTP_Message *msg_tail; /** * Message stream tokenizer for incoming data */ struct GNUNET_SERVER_MessageStreamTokenizer *msg_tk; /** * Session timeout task */ GNUNET_SCHEDULER_TaskIdentifier put_disconnect_task; /** * Session timeout task */ GNUNET_SCHEDULER_TaskIdentifier timeout_task; /** * Task to wake up client receive handle when receiving is allowed again */ GNUNET_SCHEDULER_TaskIdentifier recv_wakeup_task; /** * Absolute time when to receive data again * Used for receive throttling */ struct GNUNET_TIME_Absolute next_receive; }; /** * Encapsulation of all of the state of the plugin. */ struct HTTP_Client_Plugin { /** * Our environment. */ struct GNUNET_TRANSPORT_PluginEnvironment *env; /** * Linked list head of open sessions. */ struct Session *head; /** * Linked list tail of open sessions. */ struct Session *tail; /** * Plugin name */ char *name; /** * Protocol */ char *protocol; /** * My options to be included in the address */ uint32_t options; /** * Maximum number of sockets the plugin can use * Each http inbound /outbound connections are two connections */ unsigned int max_connections; /** * Current number of sockets the plugin can use * Each http inbound /outbound connections are two connections */ unsigned int cur_connections; /** * Last used unique HTTP connection tag */ uint32_t last_tag; /** * use IPv6 */ uint16_t use_ipv6; /** * use IPv4 */ uint16_t use_ipv4; /** * cURL Multihandle */ CURLM *curl_multi_handle; /** * curl perform task */ GNUNET_SCHEDULER_TaskIdentifier client_perform_task; }; /** * Encapsulation of all of the state of the plugin. */ struct HTTP_Client_Plugin *p; /** * Start session timeout for a session * @param s the session */ static void client_start_session_timeout (struct Session *s); /** * Increment session timeout due to activity for a session * @param s the session */ static void client_reschedule_session_timeout (struct Session *s); /** * Cancel timeout for a session * @param s the session */ static void client_stop_session_timeout (struct Session *s); /** * Function setting up file descriptors and scheduling task to run * * @param plugin plugin as closure * @param now schedule task in 1ms, regardless of what curl may say * @return GNUNET_SYSERR for hard failure, GNUNET_OK for ok */ static int client_schedule (struct HTTP_Client_Plugin *plugin, int now); /** * Connect a HTTP put connection * * @param s the session to connect * @return GNUNET_SYSERR for hard failure, GNUNET_OK for success */ static int client_connect_put (struct Session *s); /** * Does a session s exists? * * @param plugin the plugin * @param s desired session * @return GNUNET_YES or GNUNET_NO */ static int client_exist_session (struct HTTP_Client_Plugin *plugin, struct Session *s) { struct Session * head; GNUNET_assert (NULL != plugin); GNUNET_assert (NULL != s); for (head = plugin->head; head != NULL; head = head->next) { if (head == s) return GNUNET_YES; } return GNUNET_NO; } /** * Loggging function * * @param curl the curl easy handle * @param type message type * @param data data to log, NOT a 0-terminated string * @param size data length * @param cls the closure * @return always 0 */ static int client_log (CURL *curl, curl_infotype type, const char *data, size_t size, void *cls) { struct ConnectionHandle *ch = cls; const char *ttype = "UNSPECIFIED"; if ((type == CURLINFO_TEXT) || (type == CURLINFO_HEADER_IN) || (type == CURLINFO_HEADER_OUT)) { char text[size + 2]; switch (type) { case CURLINFO_TEXT: ttype = "TEXT"; break; case CURLINFO_HEADER_IN: ttype = "HEADER_IN"; break; case CURLINFO_HEADER_OUT: ttype = "HEADER_OUT"; /* Overhead*/ GNUNET_assert (NULL != ch); GNUNET_assert (NULL != ch->easyhandle); GNUNET_assert (NULL != ch->s); ch->s->overhead += size; break; default: ttype = "UNSPECIFIED"; break; } memcpy (text, data, size); if (text[size - 1] == '\n') text[size] = '\0'; else { text[size] = '\n'; text[size + 1] = '\0'; } #if BUILD_HTTPS GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "transport-https_client", "Connection %p %s: %s", ch->easyhandle, ttype, text); #else GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "transport-http_client", "Connection %p %s: %s", ch->easyhandle, ttype, text); #endif } return 0; } /** * Function that can be used by the transport service to transmit * a message using the plugin. Note that in the case of a * peer disconnecting, the continuation MUST be called * prior to the disconnect notification itself. This function * will be called with this peer's HELLO message to initiate * a fresh connection to another peer. * * @param cls closure * @param s which session must be used * @param msgbuf the message to transmit * @param msgbuf_size number of bytes in 'msgbuf' * @param priority how important is the message (most plugins will * ignore message priority and just FIFO) * @param to how long to wait at most for the transmission (does not * require plugins to discard the message after the timeout, * just advisory for the desired delay; most plugins will ignore * this as well) * @param cont continuation to call once the message has * been transmitted (or if the transport is ready * for the next transmission call; or if the * peer disconnected...); can be NULL * @param cont_cls closure for cont * @return number of bytes used (on the physical network, with overheads); * -1 on hard errors (i.e. address invalid); 0 is a legal value * and does NOT mean that the message was not transmitted (DV) */ static ssize_t http_client_plugin_send (void *cls, struct Session *s, const char *msgbuf, size_t msgbuf_size, unsigned int priority, struct GNUNET_TIME_Relative to, GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls) { struct HTTP_Client_Plugin *plugin = cls; struct HTTP_Message *msg; char *stat_txt; GNUNET_assert (plugin != NULL); GNUNET_assert (s != NULL); /* lookup if session is really existing */ if (GNUNET_YES != client_exist_session (plugin, s)) { GNUNET_break (0); return GNUNET_SYSERR; } GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, s->plugin->name, "Session %p/connection %p: Sending message with %u to peer `%s' \n", s, s->client_put, msgbuf_size, GNUNET_i2s (&s->target)); /* create new message and schedule */ msg = GNUNET_malloc (sizeof (struct HTTP_Message) + msgbuf_size); msg->next = NULL; msg->size = msgbuf_size; msg->pos = 0; msg->buf = (char *) &msg[1]; msg->transmit_cont = cont; msg->transmit_cont_cls = cont_cls; memcpy (msg->buf, msgbuf, msgbuf_size); GNUNET_CONTAINER_DLL_insert_tail (s->msg_head, s->msg_tail, msg); GNUNET_asprintf (&stat_txt, "# bytes currently in %s_client buffers", plugin->protocol); GNUNET_STATISTICS_update (plugin->env->stats, stat_txt, msgbuf_size, GNUNET_NO); GNUNET_free (stat_txt); if (GNUNET_YES == s->put_tmp_disconnecting) { /* PUT connection is currently getting disconnected */ s->put_reconnect_required = GNUNET_YES; GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, s->plugin->name, "Session %p/connection %jp: currently disconnecting, reconnecting immediately\n", s, s->client_put); return msgbuf_size; } else if (GNUNET_YES == s->put_paused) { /* PUT connection was paused, unpause */ GNUNET_assert (s->put_disconnect_task != GNUNET_SCHEDULER_NO_TASK); GNUNET_SCHEDULER_cancel (s->put_disconnect_task); s->put_disconnect_task = GNUNET_SCHEDULER_NO_TASK; GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, s->plugin->name, "Session %p/connection %p: unpausing connection\n", s, s->client_put); s->put_paused = GNUNET_NO; curl_easy_pause (s->client_put, CURLPAUSE_CONT); } else if (GNUNET_YES == s->put_tmp_disconnected) { /* PUT connection was disconnected, reconnect */ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, s->plugin->name, "Session %p: Reconnecting PUT connection\n", s); s->put_tmp_disconnected = GNUNET_NO; GNUNET_break (s->client_put == NULL); if (GNUNET_SYSERR == client_connect_put (s)) { return GNUNET_SYSERR; } } client_schedule (s->plugin, GNUNET_YES); client_reschedule_session_timeout (s); return msgbuf_size; } /** * Delete session s * * @param s the session to delete */ static void client_delete_session (struct Session *s) { struct HTTP_Client_Plugin *plugin = s->plugin; struct HTTP_Message *pos; struct HTTP_Message *next; client_stop_session_timeout (s); if (GNUNET_SCHEDULER_NO_TASK != s->put_disconnect_task) { GNUNET_SCHEDULER_cancel (s->put_disconnect_task); s->put_disconnect_task = GNUNET_SCHEDULER_NO_TASK; } GNUNET_CONTAINER_DLL_remove (plugin->head, plugin->tail, s); next = s->msg_head; while (NULL != (pos = next)) { next = pos->next; GNUNET_CONTAINER_DLL_remove (s->msg_head, s->msg_tail, pos); if (pos->transmit_cont != NULL) pos->transmit_cont (pos->transmit_cont_cls, &s->target, GNUNET_SYSERR, pos->size, pos->pos + s->overhead); s->overhead = 0; GNUNET_free (pos); } if (s->msg_tk != NULL) { GNUNET_SERVER_mst_destroy (s->msg_tk); s->msg_tk = NULL; } GNUNET_free (s->addr); GNUNET_free (s->url); GNUNET_free (s); } /** * Disconnect a session * * @param s session * @return GNUNET_OK on success, GNUNET_SYSERR on error */ static int client_disconnect (struct Session *s) { struct HTTP_Client_Plugin *plugin = s->plugin; struct HTTP_Message *msg; struct HTTP_Message *t; int res = GNUNET_OK; CURLMcode mret; if (GNUNET_YES != client_exist_session (plugin, s)) { GNUNET_break (0); return GNUNET_SYSERR; } if (s->client_put != NULL) { GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Session %p/connection %p: disconnecting PUT connection to peer `%s'\n", s, s->client_put, GNUNET_i2s (&s->target)); /* remove curl handle from multi handle */ mret = curl_multi_remove_handle (plugin->curl_multi_handle, s->client_put); if (mret != CURLM_OK) { /* clean up easy handle, handle is now invalid and free'd */ res = GNUNET_SYSERR; GNUNET_break (0); } curl_easy_cleanup (s->client_put); s->client_put = NULL; } if (s->recv_wakeup_task != GNUNET_SCHEDULER_NO_TASK) { GNUNET_SCHEDULER_cancel (s->recv_wakeup_task); s->recv_wakeup_task = GNUNET_SCHEDULER_NO_TASK; } if (s->client_get != NULL) { GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Session %p/connection %p: disconnecting GET connection to peer `%s'\n", s, s->client_get, GNUNET_i2s (&s->target)); /* remove curl handle from multi handle */ mret = curl_multi_remove_handle (plugin->curl_multi_handle, s->client_get); if (mret != CURLM_OK) { /* clean up easy handle, handle is now invalid and free'd */ res = GNUNET_SYSERR; GNUNET_break (0); } curl_easy_cleanup (s->client_get); s->client_get = NULL; } msg = s->msg_head; while (msg != NULL) { t = msg->next; if (NULL != msg->transmit_cont) msg->transmit_cont (msg->transmit_cont_cls, &s->target, GNUNET_SYSERR, msg->size, msg->pos + s->overhead); s->overhead = 0; GNUNET_CONTAINER_DLL_remove (s->msg_head, s->msg_tail, msg); GNUNET_free (msg); msg = t; } GNUNET_assert (plugin->cur_connections >= 2); plugin->cur_connections -= 2; GNUNET_STATISTICS_set (plugin->env->stats, "# HTTP client sessions", plugin->cur_connections, GNUNET_NO); GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Session %p: notifying transport about ending session\n",s); plugin->env->session_end (plugin->env->cls, &s->target, s); client_delete_session (s); /* Re-schedule since handles have changed */ if (plugin->client_perform_task != GNUNET_SCHEDULER_NO_TASK) { GNUNET_SCHEDULER_cancel (plugin->client_perform_task); plugin->client_perform_task = GNUNET_SCHEDULER_NO_TASK; } client_schedule (plugin, GNUNET_YES); return res; } /** * Function that can be used to force the plugin to disconnect * from the given peer and cancel all previous transmissions * (and their continuationc). * * @param cls closure * @param target peer from which to disconnect */ static void http_client_plugin_disconnect (void *cls, const struct GNUNET_PeerIdentity *target) { struct HTTP_Client_Plugin *plugin = cls; struct Session *next = NULL; struct Session *pos = NULL; GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Transport tells me to disconnect `%s'\n", GNUNET_i2s (target)); next = plugin->head; while (NULL != (pos = next)) { next = pos->next; if (0 == memcmp (target, &pos->target, sizeof (struct GNUNET_PeerIdentity))) { GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Disconnecting session %p to `%pos'\n", pos, GNUNET_i2s (target)); GNUNET_assert (GNUNET_OK == client_disconnect (pos)); } } } /** * Check if a sessions exists for an specific address * * @param plugin the plugin * @param address the address * @return the session or NULL */ static struct Session * client_lookup_session (struct HTTP_Client_Plugin *plugin, const struct GNUNET_HELLO_Address *address) { struct Session *pos; for (pos = plugin->head; NULL != pos; pos = pos->next) if ((0 == memcmp (&address->peer, &pos->target, sizeof (struct GNUNET_PeerIdentity))) && (address->address_length == pos->addrlen) && (0 == memcmp (address->address, pos->addr, pos->addrlen))) return pos; return NULL; } static void client_put_disconnect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct Session *s = cls; s->put_disconnect_task = GNUNET_SCHEDULER_NO_TASK; GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, s->plugin->name, "Session %p/connection %p: will be disconnected due to no activity\n", s, s->client_put); s->put_paused = GNUNET_NO; s->put_tmp_disconnecting = GNUNET_YES; curl_easy_pause (s->client_put, CURLPAUSE_CONT); client_schedule (s->plugin, GNUNET_YES); } /** * Callback method used with libcurl * Method is called when libcurl needs to read data during sending * * @param stream pointer where to write data * @param size size of an individual element * @param nmemb count of elements that can be written to the buffer * @param cls source pointer, passed to the libcurl handle * @return bytes written to stream, returning 0 will terminate connection! */ static size_t client_send_cb (void *stream, size_t size, size_t nmemb, void *cls) { struct Session *s = cls; struct HTTP_Client_Plugin *plugin = s->plugin; struct HTTP_Message *msg = s->msg_head; size_t len; char *stat_txt; if (GNUNET_YES != client_exist_session (plugin, s)) { GNUNET_break (0); return 0; } if (GNUNET_YES == s->put_tmp_disconnecting) { GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, s->plugin->name, "Session %p/connection %p: disconnect due to inactivity\n", s, s->client_put); return 0; } if (NULL == msg) { GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Session %p/connection %p: nothing to send, suspending\n", s, s->client_put); s->put_disconnect_task = GNUNET_SCHEDULER_add_delayed (PUT_DISCONNECT_TIMEOUT, &client_put_disconnect, s); s->put_paused = GNUNET_YES; return CURL_READFUNC_PAUSE; } /* data to send */ GNUNET_assert (msg->pos < msg->size); /* calculate how much fits in buffer */ len = GNUNET_MIN (msg->size - msg->pos, size * nmemb); memcpy (stream, &msg->buf[msg->pos], len); msg->pos += len; if (msg->pos == msg->size) { GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Session %p/connection %p: sent message with %u bytes sent, removing message from queue\n", s, s->client_put, msg->size, msg->pos); /* Calling transmit continuation */ GNUNET_CONTAINER_DLL_remove (s->msg_head, s->msg_tail, msg); if (NULL != msg->transmit_cont) msg->transmit_cont (msg->transmit_cont_cls, &s->target, GNUNET_OK, msg->size, msg->size + s->overhead); s->overhead = 0; GNUNET_free (msg); } GNUNET_asprintf (&stat_txt, "# bytes currently in %s_client buffers", plugin->protocol); GNUNET_STATISTICS_update (plugin->env->stats, stat_txt, -len, GNUNET_NO); GNUNET_free (stat_txt); GNUNET_asprintf (&stat_txt, "# bytes transmitted via %s_client", plugin->protocol); GNUNET_STATISTICS_update (plugin->env->stats, stat_txt, len, GNUNET_NO); GNUNET_free (stat_txt); client_reschedule_session_timeout (s); return len; } /** * Wake up a curl handle which was suspended * * @param cls the session * @param tc task context */ static void client_wake_up (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct Session *s = cls; if (GNUNET_YES != client_exist_session(p, s)) { GNUNET_break (0); return; } s->recv_wakeup_task = GNUNET_SCHEDULER_NO_TASK; if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) return; GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, s->plugin->name, "Session %p/connection %p: Waking up GET handle\n", s, s->client_get); if (s->client_get != NULL) curl_easy_pause (s->client_get, CURLPAUSE_CONT); } /** * Callback for message stream tokenizer * * @param cls the session * @param client not used * @param message the message received * @return always GNUNET_OK */ static int client_receive_mst_cb (void *cls, void *client, const struct GNUNET_MessageHeader *message) { struct Session *s = cls; struct HTTP_Client_Plugin *plugin; struct GNUNET_TIME_Relative delay; struct GNUNET_ATS_Information atsi; char *stat_txt; if (GNUNET_YES != client_exist_session(p, s)) { GNUNET_break (0); return GNUNET_OK; } plugin = s->plugin; atsi.type = htonl (GNUNET_ATS_NETWORK_TYPE); atsi.value = s->ats_address_network_type; GNUNET_break (s->ats_address_network_type != ntohl (GNUNET_ATS_NET_UNSPECIFIED)); delay = s->plugin->env->receive (plugin->env->cls, &s->target, message, s, (const char *) s->addr, s->addrlen); plugin->env->update_address_metrics (plugin->env->cls, &s->target, s->addr, s->addrlen, s, &atsi, 1); GNUNET_asprintf (&stat_txt, "# bytes received via %s_client", plugin->protocol); GNUNET_STATISTICS_update (plugin->env->stats, stat_txt, ntohs(message->size), GNUNET_NO); GNUNET_free (stat_txt); s->next_receive = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (), delay); if (GNUNET_TIME_absolute_get ().abs_value_us < s->next_receive.abs_value_us) { GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Client: peer `%s' address `%s' next read delayed for %s\n", GNUNET_i2s (&s->target), http_common_plugin_address_to_string (NULL, s->plugin->protocol, s->addr, s->addrlen), GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES)); } client_reschedule_session_timeout (s); return GNUNET_OK; } /** * Callback method used with libcurl when data for a PUT connection are * received. We do not expect data here, so we just dismiss it * * @param stream pointer where to write data * @param size size of an individual element * @param nmemb count of elements that can be written to the buffer * @param cls destination pointer, passed to the libcurl handle * @return bytes read from stream */ static size_t client_receive_put (void *stream, size_t size, size_t nmemb, void *cls) { return size * nmemb; } /** * Callback method used with libcurl when data for a GET connection are * received. Forward to MST * * @param stream pointer where to write data * @param size size of an individual element * @param nmemb count of elements that can be written to the buffer * @param cls destination pointer, passed to the libcurl handle * @return bytes read from stream */ static size_t client_receive (void *stream, size_t size, size_t nmemb, void *cls) { struct Session *s = cls; struct GNUNET_TIME_Absolute now; size_t len = size * nmemb; GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, s->plugin->name, "Session %p / connection %p: Received %u bytes from peer `%s'\n", s, s->client_get, len, GNUNET_i2s (&s->target)); now = GNUNET_TIME_absolute_get (); if (now.abs_value_us < s->next_receive.abs_value_us) { struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get (); struct GNUNET_TIME_Relative delta = GNUNET_TIME_absolute_get_difference (now, s->next_receive); GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, s->plugin->name, "Session %p / connection %p: No inbound bandwidth available! Next read was delayed for %s\n", s, s->client_get, GNUNET_STRINGS_relative_time_to_string (delta, GNUNET_YES)); if (s->recv_wakeup_task != GNUNET_SCHEDULER_NO_TASK) { GNUNET_SCHEDULER_cancel (s->recv_wakeup_task); s->recv_wakeup_task = GNUNET_SCHEDULER_NO_TASK; } s->recv_wakeup_task = GNUNET_SCHEDULER_add_delayed (delta, &client_wake_up, s); return CURL_WRITEFUNC_PAUSE; } if (NULL == s->msg_tk) s->msg_tk = GNUNET_SERVER_mst_create (&client_receive_mst_cb, s); GNUNET_SERVER_mst_receive (s->msg_tk, s, stream, len, GNUNET_NO, GNUNET_NO); return len; } /** * Task performing curl operations * * @param cls plugin as closure * @param tc gnunet scheduler task context */ static void client_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc); /** * Function setting up file descriptors and scheduling task to run * * @param plugin the plugin as closure * @param now schedule task in 1ms, regardless of what curl may say * @return GNUNET_SYSERR for hard failure, GNUNET_OK for ok */ static int client_schedule (struct HTTP_Client_Plugin *plugin, int now) { fd_set rs; fd_set ws; fd_set es; int max; struct GNUNET_NETWORK_FDSet *grs; struct GNUNET_NETWORK_FDSet *gws; long to; CURLMcode mret; struct GNUNET_TIME_Relative timeout; /* Cancel previous scheduled task */ if (plugin->client_perform_task != GNUNET_SCHEDULER_NO_TASK) { GNUNET_SCHEDULER_cancel (plugin->client_perform_task); plugin->client_perform_task = GNUNET_SCHEDULER_NO_TASK; } max = -1; FD_ZERO (&rs); FD_ZERO (&ws); FD_ZERO (&es); mret = curl_multi_fdset (plugin->curl_multi_handle, &rs, &ws, &es, &max); if (mret != CURLM_OK) { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("%s failed at %s:%d: `%s'\n"), "curl_multi_fdset", __FILE__, __LINE__, curl_multi_strerror (mret)); return GNUNET_SYSERR; } mret = curl_multi_timeout (plugin->curl_multi_handle, &to); if (to == -1) timeout = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1); else timeout = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, to); if (now == GNUNET_YES) timeout = GNUNET_TIME_UNIT_MILLISECONDS; if (mret != CURLM_OK) { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("%s failed at %s:%d: `%s'\n"), "curl_multi_timeout", __FILE__, __LINE__, curl_multi_strerror (mret)); return GNUNET_SYSERR; } grs = GNUNET_NETWORK_fdset_create (); gws = GNUNET_NETWORK_fdset_create (); GNUNET_NETWORK_fdset_copy_native (grs, &rs, max + 1); GNUNET_NETWORK_fdset_copy_native (gws, &ws, max + 1); plugin->client_perform_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT, timeout, grs, gws, &client_run, plugin); GNUNET_NETWORK_fdset_destroy (gws); GNUNET_NETWORK_fdset_destroy (grs); return GNUNET_OK; } /** * Task performing curl operations * * @param cls plugin as closure * @param tc gnunet scheduler task context */ static void client_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct HTTP_Client_Plugin *plugin = cls; int running; long http_statuscode; CURLMcode mret; GNUNET_assert (cls != NULL); plugin->client_perform_task = GNUNET_SCHEDULER_NO_TASK; if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) return; do { running = 0; mret = curl_multi_perform (plugin->curl_multi_handle, &running); CURLMsg *msg; int msgs_left; while ((msg = curl_multi_info_read (plugin->curl_multi_handle, &msgs_left))) { CURL *easy_h = msg->easy_handle; struct Session *s = NULL; char *d = (char *) s; if (easy_h == NULL) { GNUNET_break (0); GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Client: connection to ended with reason %i: `%s', %i handles running\n", msg->data.result, curl_easy_strerror (msg->data.result), running); continue; } GNUNET_assert (CURLE_OK == curl_easy_getinfo (easy_h, CURLINFO_PRIVATE, &d)); s = (struct Session *) d; if (GNUNET_YES != client_exist_session(plugin, s)) { GNUNET_break (0); return; } GNUNET_assert (s != NULL); if (msg->msg == CURLMSG_DONE) { curl_easy_getinfo (easy_h, CURLINFO_RESPONSE_CODE, &http_statuscode); if (easy_h == s->client_put) { if ((0 != msg->data.result) || (http_statuscode != 200)) { GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Session %p/connection %p: PUT connection to `%s' ended with status %i reason %i: `%s'\n", s, msg->easy_handle, GNUNET_i2s (&s->target), http_statuscode, msg->data.result, curl_easy_strerror (msg->data.result)); } else GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Session %p/connection %p: PUT connection to `%s' ended normal\n", s, msg->easy_handle, GNUNET_i2s (&s->target)); if (s->client_get == NULL) { /* Disconnect other transmission direction and tell transport */ } curl_multi_remove_handle (plugin->curl_multi_handle, easy_h); curl_easy_cleanup (easy_h); s->put_tmp_disconnecting = GNUNET_NO; s->put_tmp_disconnected = GNUNET_YES; s->client_put = NULL; s->put.easyhandle = NULL; s->put.s = NULL; /* * Handling a rare case: * plugin_send was called during temporary put disconnect, * reconnect required after connection was disconnected */ if (GNUNET_YES == s->put_reconnect_required) { s->put_reconnect_required = GNUNET_NO; if (GNUNET_SYSERR == client_connect_put(s)) { GNUNET_break (s->client_put == NULL); GNUNET_break (s->put_tmp_disconnected == GNUNET_NO); } } } if (easy_h == s->client_get) { if ((0 != msg->data.result) || (http_statuscode != 200)) { GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Session %p/connection %p: GET connection to `%s' ended with status %i reason %i: `%s'\n", s, msg->easy_handle, GNUNET_i2s (&s->target), http_statuscode, msg->data.result, curl_easy_strerror (msg->data.result)); } else GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Session %p/connection %p: GET connection to `%s' ended normal\n", s, msg->easy_handle, GNUNET_i2s (&s->target)); /* Disconnect other transmission direction and tell transport */ s->get.easyhandle = NULL; s->get.s = NULL; client_disconnect (s); } } } } while (mret == CURLM_CALL_MULTI_PERFORM); client_schedule (plugin, GNUNET_NO); } /** * Connect GET connection for a session * * @param s the session to connect * @return GNUNET_OK on success, GNUNET_SYSERR otherwise */ static int client_connect_get (struct Session *s) { CURLMcode mret; /* create get connection */ s->client_get = curl_easy_init (); s->get.s = s; s->get.easyhandle = s->client_get; #if VERBOSE_CURL curl_easy_setopt (s->client_get, CURLOPT_VERBOSE, 1L); curl_easy_setopt (s->client_get, CURLOPT_DEBUGFUNCTION, &client_log); curl_easy_setopt (s->client_get, CURLOPT_DEBUGDATA, &s->get); #endif #if BUILD_HTTPS curl_easy_setopt (s->client_get, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1); if (HTTP_OPTIONS_VERIFY_CERTIFICATE == (ntohl (s->addr->options) & HTTP_OPTIONS_VERIFY_CERTIFICATE)) { curl_easy_setopt (s->client_get, CURLOPT_SSL_VERIFYPEER, 1L); curl_easy_setopt (s->client_get, CURLOPT_SSL_VERIFYHOST, 2L); } else { curl_easy_setopt (s->client_get, CURLOPT_SSL_VERIFYPEER, 0); curl_easy_setopt (s->client_get, CURLOPT_SSL_VERIFYHOST, 0); } curl_easy_setopt (s->client_get, CURLOPT_PROTOCOLS, CURLPROTO_HTTPS); curl_easy_setopt (s->client_get, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTPS); #else curl_easy_setopt (s->client_get, CURLOPT_PROTOCOLS, CURLPROTO_HTTP); curl_easy_setopt (s->client_get, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTP); #endif curl_easy_setopt (s->client_get, CURLOPT_URL, s->url); //curl_easy_setopt (s->client_get, CURLOPT_HEADERFUNCTION, &curl_get_header_cb); //curl_easy_setopt (s->client_get, CURLOPT_WRITEHEADER, ps); curl_easy_setopt (s->client_get, CURLOPT_READFUNCTION, client_send_cb); curl_easy_setopt (s->client_get, CURLOPT_READDATA, s); curl_easy_setopt (s->client_get, CURLOPT_WRITEFUNCTION, client_receive); curl_easy_setopt (s->client_get, CURLOPT_WRITEDATA, s); /* No timeout by default, timeout done with session timeout */ curl_easy_setopt (s->client_get, CURLOPT_TIMEOUT, 0); curl_easy_setopt (s->client_get, CURLOPT_PRIVATE, s); curl_easy_setopt (s->client_get, CURLOPT_CONNECTTIMEOUT_MS, (long) HTTP_CLIENT_NOT_VALIDATED_TIMEOUT.rel_value_us / 1000LL); curl_easy_setopt (s->client_get, CURLOPT_BUFFERSIZE, 2 * GNUNET_SERVER_MAX_MESSAGE_SIZE); #if CURL_TCP_NODELAY curl_easy_setopt (ps->recv_endpoint, CURLOPT_TCP_NODELAY, 1); #endif curl_easy_setopt (s->client_get, CURLOPT_FOLLOWLOCATION, 0); mret = curl_multi_add_handle (s->plugin->curl_multi_handle, s->client_get); if (mret != CURLM_OK) { GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, s->plugin->name, "Session %p : Failed to add GET handle to multihandle: `%s'\n", s, curl_multi_strerror (mret)); curl_easy_cleanup (s->client_get); s->client_get = NULL; s->get.s = NULL; s->get.easyhandle = NULL; GNUNET_break (0); return GNUNET_SYSERR; } return GNUNET_OK; } /** * Connect a HTTP put connection * * @param s the session to connect * @return GNUNET_SYSERR for hard failure, GNUNET_OK for ok */ static int client_connect_put (struct Session *s) { CURLMcode mret; /* create put connection */ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, s->plugin->name, "Session %p : Init PUT handle \n", s); s->client_put = curl_easy_init (); s->put.s = s; s->put.easyhandle = s->client_put; #if VERBOSE_CURL curl_easy_setopt (s->client_put, CURLOPT_VERBOSE, 1L); curl_easy_setopt (s->client_put, CURLOPT_DEBUGFUNCTION, &client_log); curl_easy_setopt (s->client_put, CURLOPT_DEBUGDATA, &s->put); #endif #if BUILD_HTTPS curl_easy_setopt (s->client_put, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1); if (HTTP_OPTIONS_VERIFY_CERTIFICATE == (ntohl (s->addr->options) & HTTP_OPTIONS_VERIFY_CERTIFICATE)) { curl_easy_setopt (s->client_put, CURLOPT_SSL_VERIFYPEER, 1L); curl_easy_setopt (s->client_put, CURLOPT_SSL_VERIFYHOST, 2L); } else { curl_easy_setopt (s->client_put, CURLOPT_SSL_VERIFYPEER, 0); curl_easy_setopt (s->client_put, CURLOPT_SSL_VERIFYHOST, 0); } curl_easy_setopt (s->client_get, CURLOPT_PROTOCOLS, CURLPROTO_HTTPS); curl_easy_setopt (s->client_get, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTPS); #else curl_easy_setopt (s->client_get, CURLOPT_PROTOCOLS, CURLPROTO_HTTP); curl_easy_setopt (s->client_get, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTP); #endif curl_easy_setopt (s->client_put, CURLOPT_URL, s->url); curl_easy_setopt (s->client_put, CURLOPT_UPLOAD, 1L); //curl_easy_setopt (s->client_put, CURLOPT_HEADERFUNCTION, &client_curl_header); //curl_easy_setopt (s->client_put, CURLOPT_WRITEHEADER, ps); curl_easy_setopt (s->client_put, CURLOPT_READFUNCTION, client_send_cb); curl_easy_setopt (s->client_put, CURLOPT_READDATA, s); curl_easy_setopt (s->client_put, CURLOPT_WRITEFUNCTION, client_receive_put); curl_easy_setopt (s->client_put, CURLOPT_WRITEDATA, s); /* No timeout by default, timeout done with session timeout */ curl_easy_setopt (s->client_put, CURLOPT_TIMEOUT, 0); curl_easy_setopt (s->client_put, CURLOPT_PRIVATE, s); curl_easy_setopt (s->client_put, CURLOPT_CONNECTTIMEOUT_MS, (long) HTTP_CLIENT_NOT_VALIDATED_TIMEOUT.rel_value_us / 1000LL); curl_easy_setopt (s->client_put, CURLOPT_BUFFERSIZE, 2 * GNUNET_SERVER_MAX_MESSAGE_SIZE); #if CURL_TCP_NODELAY curl_easy_setopt (s->client_put, CURLOPT_TCP_NODELAY, 1); #endif mret = curl_multi_add_handle (s->plugin->curl_multi_handle, s->client_put); if (mret != CURLM_OK) { GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, s->plugin->name, "Session %p : Failed to add PUT handle to multihandle: `%s'\n", s, curl_multi_strerror (mret)); curl_easy_cleanup (s->client_put); s->client_put = NULL; s->put.easyhandle = NULL; s->put.s = NULL; s->put_tmp_disconnected = GNUNET_YES; return GNUNET_SYSERR; } s->put_tmp_disconnected = GNUNET_NO; return GNUNET_OK; } /** * Connect both PUT and GET connection for a session * * @param s the session to connect * @return GNUNET_OK on success, GNUNET_SYSERR otherwise */ static int client_connect (struct Session *s) { struct HTTP_Client_Plugin *plugin = s->plugin; int res = GNUNET_OK; /* create url */ if (NULL == http_common_plugin_address_to_string (NULL, plugin->protocol, s->addr, s->addrlen)) { GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Invalid address peer `%s'\n", GNUNET_i2s (&s->target)); return GNUNET_SYSERR; } GNUNET_asprintf (&s->url, "%s/%s;%u", http_common_plugin_address_to_url (NULL, s->addr, s->addrlen), GNUNET_i2s_full (plugin->env->my_identity), plugin->last_tag); plugin->last_tag++; GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Initiating outbound session peer `%s' using address `%s'\n", GNUNET_i2s (&s->target), s->url); if ((GNUNET_SYSERR == client_connect_get (s)) || (GNUNET_SYSERR == client_connect_put (s))) { GNUNET_break (0); return GNUNET_SYSERR; } GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Session %p: connected with connections GET %p and PUT %p\n", s, s->client_get, s->client_put); /* Perform connect */ plugin->cur_connections += 2; GNUNET_STATISTICS_set (plugin->env->stats, "# HTTP client connections", plugin->cur_connections, GNUNET_NO); /* Re-schedule since handles have changed */ if (plugin->client_perform_task != GNUNET_SCHEDULER_NO_TASK) { GNUNET_SCHEDULER_cancel (plugin->client_perform_task); plugin->client_perform_task = GNUNET_SCHEDULER_NO_TASK; } plugin->client_perform_task = GNUNET_SCHEDULER_add_now (client_run, plugin); return res; } /** * Function obtain the network type for a session * * @param cls closure ('struct Plugin*') * @param session the session * @return the network type in HBO or GNUNET_SYSERR */ static enum GNUNET_ATS_Network_Type http_client_get_network (void *cls, struct Session *session) { GNUNET_assert (NULL != session); return ntohl (session->ats_address_network_type); } /** * Creates a new outbound session the transport service will use to send data to the * peer * * @param cls the plugin * @param address the address * @return the session or NULL of max connections exceeded */ static struct Session * http_client_plugin_get_session (void *cls, const struct GNUNET_HELLO_Address *address) { struct HTTP_Client_Plugin *plugin = cls; struct Session * s = NULL; struct sockaddr *sa; struct GNUNET_ATS_Information ats; size_t salen = 0; int res; GNUNET_assert (plugin != NULL); GNUNET_assert (address != NULL); GNUNET_assert (address->address != NULL); /* find existing session */ s = client_lookup_session (plugin, address); if (s != NULL) return s; if (plugin->max_connections <= plugin->cur_connections) { GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, plugin->name, "Maximum number of connections (%u) reached: " "cannot connect to peer `%s'\n", plugin->max_connections, GNUNET_i2s (&address->peer)); return NULL; } /* Determine network location */ ats.type = htonl (GNUNET_ATS_NETWORK_TYPE); ats.value = htonl (GNUNET_ATS_NET_UNSPECIFIED); sa = http_common_socket_from_address (address->address, address->address_length, &res); if (GNUNET_SYSERR == res) { return NULL; } else if (GNUNET_YES == res) { GNUNET_assert (NULL != sa); if (AF_INET == sa->sa_family) { salen = sizeof (struct sockaddr_in); } else if (AF_INET6 == sa->sa_family) { salen = sizeof (struct sockaddr_in6); } ats = plugin->env->get_address_type (plugin->env->cls, sa, salen); //fprintf (stderr, "Address %s is in %s\n", GNUNET_a2s (sa,salen), GNUNET_ATS_print_network_type(ntohl(ats.value))); GNUNET_free (sa); } else if (GNUNET_NO == res) { /* Cannot convert to sockaddr -> is external hostname */ ats.value = htonl (GNUNET_ATS_NET_WAN); } if (GNUNET_ATS_NET_UNSPECIFIED == ntohl(ats.value)) { GNUNET_break (0); return NULL; } s = GNUNET_malloc (sizeof (struct Session)); memcpy (&s->target, &address->peer, sizeof (struct GNUNET_PeerIdentity)); s->plugin = plugin; s->addr = GNUNET_malloc (address->address_length); memcpy (s->addr, address->address, address->address_length); s->addrlen = address->address_length; s->ats_address_network_type = ats.value; s->put_paused = GNUNET_NO; s->put_tmp_disconnecting = GNUNET_NO; s->put_tmp_disconnected = GNUNET_NO; client_start_session_timeout (s); GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, "Created new session %p for `%s' address `%s''\n", s, http_common_plugin_address_to_string (NULL, plugin->protocol, s->addr, s->addrlen), GNUNET_i2s (&s->target)); /* add new session */ GNUNET_CONTAINER_DLL_insert (plugin->head, plugin->tail, s); /* initiate new connection */ if (GNUNET_SYSERR == client_connect (s)) { GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, plugin->name, "Cannot connect to peer `%s' address `%s''\n", http_common_plugin_address_to_string (NULL, plugin->protocol, s->addr, s->addrlen), GNUNET_i2s (&s->target)); client_delete_session (s); return NULL; } return s; } /** * Setup http_client plugin * * @param plugin the plugin handle * @return GNUNET_OK on success, GNUNET_SYSERR on error */ static int client_start (struct HTTP_Client_Plugin *plugin) { curl_global_init (CURL_GLOBAL_ALL); plugin->curl_multi_handle = curl_multi_init (); if (NULL == plugin->curl_multi_handle) { GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, plugin->name, _("Could not initialize curl multi handle, failed to start %s plugin!\n"), plugin->name); return GNUNET_SYSERR; } return GNUNET_OK; } /** * Session was idle, so disconnect it */ static void client_session_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { GNUNET_assert (NULL != cls); struct Session *s = cls; s->timeout_task = GNUNET_SCHEDULER_NO_TASK; GNUNET_log (TIMEOUT_LOG, "Session %p was idle for %s, disconnecting\n", s, GNUNET_STRINGS_relative_time_to_string (CLIENT_SESSION_TIMEOUT, GNUNET_YES)); /* call session destroy function */ GNUNET_assert (GNUNET_OK == client_disconnect (s)); } /** * Start session timeout for session s * * @param s the session */ static void client_start_session_timeout (struct Session *s) { GNUNET_assert (NULL != s); GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == s->timeout_task); s->timeout_task = GNUNET_SCHEDULER_add_delayed (CLIENT_SESSION_TIMEOUT, &client_session_timeout, s); GNUNET_log (TIMEOUT_LOG, "Timeout for session %p set to %s\n", s, GNUNET_STRINGS_relative_time_to_string (CLIENT_SESSION_TIMEOUT, GNUNET_YES)); } /** * Increment session timeout due to activity for session s * * param s the session */ static void client_reschedule_session_timeout (struct Session *s) { GNUNET_assert (NULL != s); GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != s->timeout_task); GNUNET_SCHEDULER_cancel (s->timeout_task); s->timeout_task = GNUNET_SCHEDULER_add_delayed (CLIENT_SESSION_TIMEOUT, &client_session_timeout, s); GNUNET_log (TIMEOUT_LOG, "Timeout rescheduled for session %p set to %s\n", s, GNUNET_STRINGS_relative_time_to_string (CLIENT_SESSION_TIMEOUT, GNUNET_YES)); } /** * Cancel timeout due to activity for session s * * param s the session */ static void client_stop_session_timeout (struct Session *s) { GNUNET_assert (NULL != s); if (GNUNET_SCHEDULER_NO_TASK != s->timeout_task) { GNUNET_SCHEDULER_cancel (s->timeout_task); s->timeout_task = GNUNET_SCHEDULER_NO_TASK; GNUNET_log (TIMEOUT_LOG, "Timeout stopped for session %p\n", s); } } /** * Another peer has suggested an address for this * peer and transport plugin. Check that this could be a valid * address. If so, consider adding it to the list * of addresses. * * @param cls closure * @param addr pointer to the address * @param addrlen length of addr * @return GNUNET_OK if this is a plausible address for this peer * and transport */ static int http_client_plugin_address_suggested (void *cls, const void *addr, size_t addrlen) { /* struct Plugin *plugin = cls; */ /* A HTTP/S client does not have any valid address so:*/ return GNUNET_NO; } /** * Exit point from the plugin. * * @param cls api as closure * @return NULL */ void * LIBGNUNET_PLUGIN_TRANSPORT_DONE (void *cls) { struct GNUNET_TRANSPORT_PluginFunctions *api = cls; struct HTTP_Client_Plugin *plugin = api->cls; struct Session *pos; struct Session *next; if (NULL == api->cls) { /* Stub shutdown */ GNUNET_free (api); return NULL; } GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, _("Shutting down plugin `%s'\n"), plugin->name); next = plugin->head; while (NULL != (pos = next)) { next = pos->next; client_disconnect (pos); } if (GNUNET_SCHEDULER_NO_TASK != plugin->client_perform_task) { GNUNET_SCHEDULER_cancel (plugin->client_perform_task); plugin->client_perform_task = GNUNET_SCHEDULER_NO_TASK; } if (NULL != plugin->curl_multi_handle) { curl_multi_cleanup (plugin->curl_multi_handle); plugin->curl_multi_handle = NULL; } curl_global_cleanup (); GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, _("Shutdown for plugin `%s' complete\n"), plugin->name); GNUNET_free (plugin); GNUNET_free (api); return NULL; } /** * Configure plugin * * @param plugin the plugin handle * @return GNUNET_OK on success, GNUNET_SYSERR on failure */ static int client_configure_plugin (struct HTTP_Client_Plugin *plugin) { unsigned long long max_connections; /* Optional parameters */ if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (plugin->env->cfg, plugin->name, "MAX_CONNECTIONS", &max_connections)) max_connections = 128; plugin->max_connections = max_connections; GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name, _("Maximum number of connections is %u\n"), plugin->max_connections); return GNUNET_OK; } const char *http_plugin_address_to_string (void *cls, const void *addr, size_t addrlen) { return http_common_plugin_address_to_string (cls, PLUGIN_NAME, addr, addrlen); } /** * Entry point for the plugin. */ void * LIBGNUNET_PLUGIN_TRANSPORT_INIT (void *cls) { struct GNUNET_TRANSPORT_PluginEnvironment *env = cls; struct GNUNET_TRANSPORT_PluginFunctions *api; struct HTTP_Client_Plugin *plugin; if (NULL == env->receive) { /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully initialze the plugin or the API */ api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions)); api->cls = NULL; api->address_to_string = &http_plugin_address_to_string; api->string_to_address = &http_common_plugin_string_to_address; api->address_pretty_printer = &http_common_plugin_address_pretty_printer; return api; } plugin = GNUNET_malloc (sizeof (struct HTTP_Client_Plugin)); p = plugin; plugin->env = env; api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions)); api->cls = plugin; api->send = &http_client_plugin_send; api->disconnect = &http_client_plugin_disconnect; api->check_address = &http_client_plugin_address_suggested; api->get_session = &http_client_plugin_get_session; api->address_to_string = &http_plugin_address_to_string; api->string_to_address = &http_common_plugin_string_to_address; api->address_pretty_printer = &http_common_plugin_address_pretty_printer; api->get_network = &http_client_get_network; #if BUILD_HTTPS plugin->name = "transport-https_client"; plugin->protocol = "https"; #else plugin->name = "transport-http_client"; plugin->protocol = "http"; #endif plugin->last_tag = 1; plugin->options = 0; /* Setup options */ if (GNUNET_SYSERR == client_configure_plugin (plugin)) { LIBGNUNET_PLUGIN_TRANSPORT_DONE (api); return NULL; } /* Start client */ if (GNUNET_SYSERR == client_start (plugin)) { LIBGNUNET_PLUGIN_TRANSPORT_DONE (api); return NULL; } return api; } /* end of plugin_transport_http_client.c */