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- /*
- This file is part of GNUnet.
- Copyright (C) 2012-2015 GNUnet e.V.
- 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., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA.
- */
- /**
- * @author Martin Schanzenbach
- * @file src/rest/gnunet-rest-server.c
- * @brief REST service for GNUnet services
- *
- */
- #include "platform.h"
- #include <microhttpd.h>
- #include "gnunet_util_lib.h"
- #include "gnunet_rest_plugin.h"
- /**
- * Default Socks5 listen port.
- */
- #define GNUNET_REST_SERVICE_PORT 7776
- /**
- * Maximum supported length for a URI.
- * Should die. @deprecated
- */
- #define MAX_HTTP_URI_LENGTH 2048
- /**
- * Port for plaintext HTTP.
- */
- #define HTTP_PORT 80
- /**
- * Port for HTTPS.
- */
- #define HTTPS_PORT 443
- /**
- * After how long do we clean up unused MHD SSL/TLS instances?
- */
- #define MHD_CACHE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
- #define GN_REST_STATE_INIT 0
- #define GN_REST_STATE_PROCESSING 1
- /**
- * The task ID
- */
- static struct GNUNET_SCHEDULER_Task *httpd_task;
- /**
- * The port the service is running on (default 7776)
- */
- static unsigned long long port = GNUNET_REST_SERVICE_PORT;
- /**
- * The listen socket of the service for IPv4
- */
- static struct GNUNET_NETWORK_Handle *lsock4;
- /**
- * The listen socket of the service for IPv6
- */
- static struct GNUNET_NETWORK_Handle *lsock6;
- /**
- * The listen task ID for IPv4
- */
- static struct GNUNET_SCHEDULER_Task * ltask4;
- /**
- * The listen task ID for IPv6
- */
- static struct GNUNET_SCHEDULER_Task * ltask6;
- /**
- * Daemon for HTTP
- */
- static struct MHD_Daemon *httpd;
- /**
- * Response we return on failures.
- */
- static struct MHD_Response *failure_response;
- /**
- * Our configuration.
- */
- static const struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * Map of loaded plugins.
- */
- static struct GNUNET_CONTAINER_MultiHashMap *plugin_map;
- /**
- * Allowed Origins (CORS)
- */
- static char* allow_origin;
- /**
- * Allowed Headers (CORS)
- */
- static char* allow_headers;
- /**
- * MHD Connection handle
- */
- struct MhdConnectionHandle
- {
- struct MHD_Connection *con;
- struct MHD_Response *response;
- struct GNUNET_REST_Plugin *plugin;
- struct GNUNET_REST_RequestHandle *data_handle;
- int status;
- int state;
- };
- /* ************************* Global helpers ********************* */
- /**
- * Task run whenever HTTP server operations are pending.
- *
- * @param cls NULL
- */
- static void
- do_httpd (void *cls);
- /**
- * Run MHD now, we have extra data ready for the callback.
- */
- static void
- run_mhd_now ()
- {
- if (NULL !=
- httpd_task)
- GNUNET_SCHEDULER_cancel (httpd_task);
- httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd,
- NULL);
- }
- /**
- * Plugin result callback
- *
- * @param cls closure (MHD connection handle)
- * @param data the data to return to the caller
- * @param len length of the data
- * @param status #GNUNET_OK if successful
- */
- static void
- plugin_callback (void *cls,
- struct MHD_Response *resp,
- int status)
- {
- struct MhdConnectionHandle *handle = cls;
- handle->status = status;
- handle->response = resp;
- run_mhd_now();
- }
- static int
- cleanup_url_map (void *cls,
- const struct GNUNET_HashCode *key,
- void *value)
- {
- GNUNET_free_non_null (value);
- return GNUNET_YES;
- }
- static void
- cleanup_handle (struct MhdConnectionHandle *handle)
- {
- if (NULL != handle->response)
- MHD_destroy_response (handle->response);
- if (NULL != handle->data_handle)
- {
- if (NULL != handle->data_handle->url_param_map)
- {
- GNUNET_CONTAINER_multihashmap_iterate (handle->data_handle->url_param_map,
- &cleanup_url_map,
- NULL);
- GNUNET_CONTAINER_multihashmap_destroy (handle->data_handle->url_param_map);
- }
- GNUNET_free (handle->data_handle);
- }
- GNUNET_free (handle);
- }
- static int
- url_iterator (void *cls,
- enum MHD_ValueKind kind,
- const char *key,
- const char *value)
- {
- struct GNUNET_REST_RequestHandle *handle = cls;
- struct GNUNET_HashCode hkey;
- char *val;
- GNUNET_CRYPTO_hash (key, strlen (key), &hkey);
- GNUNET_asprintf (&val, "%s", value);
- if (GNUNET_OK !=
- GNUNET_CONTAINER_multihashmap_put (handle->url_param_map,
- &hkey,
- val,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Could not load add url param `%s'=%s\n",
- key, value);
- }
- return MHD_YES;
- }
- /* ********************************* MHD response generation ******************* */
- /**
- * Main MHD callback for handling requests.
- *
- * @param cls unused
- * @param con MHD connection handle
- * @param url the url in the request
- * @param meth the HTTP method used ("GET", "PUT", etc.)
- * @param ver the HTTP version string (i.e. "HTTP/1.1")
- * @param upload_data the data being uploaded (excluding HEADERS,
- * for a POST that fits into memory and that is encoded
- * with a supported encoding, the POST data will NOT be
- * given in upload_data and is instead available as
- * part of MHD_get_connection_values; very large POST
- * data *will* be made available incrementally in
- * upload_data)
- * @param upload_data_size set initially to the size of the
- * @a upload_data provided; the method must update this
- * value to the number of bytes NOT processed;
- * @param con_cls pointer to location where we store the 'struct Request'
- * @return MHD_YES if the connection was handled successfully,
- * MHD_NO if the socket must be closed due to a serious
- * error while handling the request
- */
- static int
- create_response (void *cls,
- struct MHD_Connection *con,
- const char *url,
- const char *meth,
- const char *ver,
- const char *upload_data,
- size_t *upload_data_size,
- void **con_cls)
- {
- char *plugin_name;
- struct GNUNET_HashCode key;
- struct MhdConnectionHandle *con_handle;
- struct GNUNET_REST_RequestHandle *rest_conndata_handle;
- con_handle = *con_cls;
- if (NULL == *con_cls)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "New connection %s\n", url);
- char tmp_url[strlen(url)+1];
- strcpy (tmp_url, url);
- con_handle = GNUNET_new (struct MhdConnectionHandle);
- con_handle->con = con;
- con_handle->state = GN_REST_STATE_INIT;
- *con_cls = con_handle;
- plugin_name = strtok(tmp_url, "/");
- if (NULL != plugin_name)
- {
- GNUNET_CRYPTO_hash (plugin_name, strlen (plugin_name), &key);
- con_handle->plugin = GNUNET_CONTAINER_multihashmap_get (plugin_map,
- &key);
- }
- if (NULL == con_handle->plugin)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Queueing response with MHD\n");
- GNUNET_free (con_handle);
- return MHD_queue_response (con,
- MHD_HTTP_NOT_FOUND,
- failure_response);
- }
- return MHD_YES;
- }
- if (GN_REST_STATE_INIT == con_handle->state)
- {
- rest_conndata_handle = GNUNET_new (struct GNUNET_REST_RequestHandle);
- rest_conndata_handle->method = meth;
- rest_conndata_handle->url = url;
- rest_conndata_handle->data = upload_data;
- rest_conndata_handle->data_size = *upload_data_size;
- rest_conndata_handle->url_param_map = GNUNET_CONTAINER_multihashmap_create (16,
- GNUNET_NO);
- con_handle->data_handle = rest_conndata_handle;
- MHD_get_connection_values (con,
- MHD_GET_ARGUMENT_KIND,
- &url_iterator,
- rest_conndata_handle);
- con_handle->state = GN_REST_STATE_PROCESSING;
- con_handle->plugin->process_request (rest_conndata_handle,
- &plugin_callback,
- con_handle);
- *upload_data_size = 0;
- }
- if (NULL != con_handle->response)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Queueing response from plugin with MHD\n");
- //Handle Preflights
- if (NULL != allow_origin)
- {
- MHD_add_response_header (con_handle->response,
- MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN,
- allow_origin);
- }
- if (NULL != allow_headers)
- {
- MHD_add_response_header (con_handle->response,
- "Access-Control-Allow-Headers",
- allow_headers);
- }
- //Always add JSONAPI content type. TODO
- MHD_add_response_header (con_handle->response,
- MHD_HTTP_HEADER_CONTENT_TYPE,
- "application/vnd.api+json");
- int ret = MHD_queue_response (con,
- con_handle->status,
- con_handle->response);
- cleanup_handle (con_handle);
- return ret;
- }
- return MHD_YES;
- }
- /* ******************** MHD HTTP setup and event loop ******************** */
- /**
- * Function called when MHD decides that we are done with a connection.
- *
- * @param cls NULL
- * @param connection connection handle
- * @param con_cls value as set by the last call to
- * the MHD_AccessHandlerCallback, should be our handle
- * @param toe reason for request termination (ignored)
- */
- static void
- mhd_completed_cb (void *cls,
- struct MHD_Connection *connection,
- void **con_cls,
- enum MHD_RequestTerminationCode toe)
- {
- if (MHD_REQUEST_TERMINATED_COMPLETED_OK != toe)
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "MHD encountered error handling request: %d\n",
- toe);
- }
- /**
- * Kill the MHD daemon.
- */
- static void
- kill_httpd ()
- {
- if (NULL != httpd)
- {
- MHD_stop_daemon (httpd);
- httpd = NULL;
- }
- if (NULL != httpd_task)
- {
- GNUNET_SCHEDULER_cancel (httpd_task);
- httpd_task = NULL;
- }
- if (NULL != ltask4)
- {
- GNUNET_SCHEDULER_cancel (ltask4);
- ltask4 = NULL;
- }
- if (NULL != ltask6)
- {
- GNUNET_SCHEDULER_cancel (ltask6);
- ltask6 = NULL;
- }
- }
- /**
- * Schedule MHD. This function should be called initially when an
- * MHD is first getting its client socket, and will then automatically
- * always be called later whenever there is work to be done.
- *
- * @param hd the daemon to schedule
- */
- static void
- schedule_httpd ()
- {
- fd_set rs;
- fd_set ws;
- fd_set es;
- struct GNUNET_NETWORK_FDSet *wrs;
- struct GNUNET_NETWORK_FDSet *wws;
- int max;
- int haveto;
- MHD_UNSIGNED_LONG_LONG timeout;
- struct GNUNET_TIME_Relative tv;
- FD_ZERO (&rs);
- FD_ZERO (&ws);
- FD_ZERO (&es);
- max = -1;
- if (MHD_YES != MHD_get_fdset (httpd, &rs, &ws, &es, &max))
- {
- kill_httpd ();
- return;
- }
- haveto = MHD_get_timeout (httpd, &timeout);
- if (MHD_YES == haveto)
- tv.rel_value_us = (uint64_t) timeout * 1000LL;
- else
- tv = GNUNET_TIME_UNIT_FOREVER_REL;
- if (-1 != max)
- {
- wrs = GNUNET_NETWORK_fdset_create ();
- wws = GNUNET_NETWORK_fdset_create ();
- GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
- GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
- }
- else
- {
- wrs = NULL;
- wws = NULL;
- }
- if (NULL != httpd_task)
- GNUNET_SCHEDULER_cancel (httpd_task);
- if ( (MHD_YES == haveto) ||
- (-1 != max))
- {
- httpd_task =
- GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
- tv, wrs, wws,
- &do_httpd, NULL);
- }
- if (NULL != wrs)
- GNUNET_NETWORK_fdset_destroy (wrs);
- if (NULL != wws)
- GNUNET_NETWORK_fdset_destroy (wws);
- }
- /**
- * Task run whenever HTTP server operations are pending.
- *
- * @param cls NULL
- */
- static void
- do_httpd (void *cls)
- {
- httpd_task = NULL;
- MHD_run (httpd);
- schedule_httpd ();
- }
- /**
- * Accept new incoming connections
- *
- * @param cls the closure with the lsock4 or lsock6
- * @param tc the scheduler context
- */
- static void
- do_accept (void *cls)
- {
- struct GNUNET_NETWORK_Handle *lsock = cls;
- struct GNUNET_NETWORK_Handle *s;
- int fd;
- const struct sockaddr *addr;
- socklen_t len;
- if (lsock == lsock4)
- ltask4 = NULL;
- else
- ltask6 = NULL;
- if (lsock == lsock4)
- ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
- lsock,
- &do_accept, lsock);
- else
- ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
- lsock,
- &do_accept, lsock);
- s = GNUNET_NETWORK_socket_accept (lsock, NULL, NULL);
- if (NULL == s)
- {
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "accept");
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Got an inbound connection, waiting for data\n");
- fd = GNUNET_NETWORK_get_fd (s);
- addr = GNUNET_NETWORK_get_addr (s);
- len = GNUNET_NETWORK_get_addrlen (s);
- if (MHD_YES != MHD_add_connection (httpd, fd, addr, len))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Failed to pass client to MHD\n"));
- return;
- }
- schedule_httpd ();
- }
- /**
- * Task run on shutdown
- *
- * @param cls closure
- */
- static void
- do_shutdown (void *cls)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Shutting down...\n");
- kill_httpd ();
- GNUNET_free_non_null (allow_origin);
- GNUNET_free_non_null (allow_headers);
- }
- /**
- * Create an IPv4 listen socket bound to our port.
- *
- * @return NULL on error
- */
- static struct GNUNET_NETWORK_Handle *
- bind_v4 ()
- {
- struct GNUNET_NETWORK_Handle *ls;
- struct sockaddr_in sa4;
- int eno;
- memset (&sa4, 0, sizeof (sa4));
- sa4.sin_family = AF_INET;
- sa4.sin_port = htons (port);
- #if HAVE_SOCKADDR_IN_SIN_LEN
- sa4.sin_len = sizeof (sa4);
- #endif
- ls = GNUNET_NETWORK_socket_create (AF_INET,
- SOCK_STREAM,
- 0);
- if (NULL == ls)
- return NULL;
- if (GNUNET_OK !=
- GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa4,
- sizeof (sa4)))
- {
- eno = errno;
- GNUNET_NETWORK_socket_close (ls);
- errno = eno;
- return NULL;
- }
- return ls;
- }
- /**
- * Create an IPv6 listen socket bound to our port.
- *
- * @return NULL on error
- */
- static struct GNUNET_NETWORK_Handle *
- bind_v6 ()
- {
- struct GNUNET_NETWORK_Handle *ls;
- struct sockaddr_in6 sa6;
- int eno;
- memset (&sa6, 0, sizeof (sa6));
- sa6.sin6_family = AF_INET6;
- sa6.sin6_port = htons (port);
- #if HAVE_SOCKADDR_IN_SIN_LEN
- sa6.sin6_len = sizeof (sa6);
- #endif
- ls = GNUNET_NETWORK_socket_create (AF_INET6,
- SOCK_STREAM,
- 0);
- if (NULL == ls)
- return NULL;
- if (GNUNET_OK !=
- GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa6,
- sizeof (sa6)))
- {
- eno = errno;
- GNUNET_NETWORK_socket_close (ls);
- errno = eno;
- return NULL;
- }
- return ls;
- }
- /**
- * Callback for plugin load
- *
- * @param cls NULL
- * @param libname the name of the library loaded
- * @param lib_ret the object returned by the plugin initializer
- */
- static void
- load_plugin (void *cls,
- const char *libname,
- void *lib_ret)
- {
- struct GNUNET_REST_Plugin *plugin = lib_ret;
- struct GNUNET_HashCode key;
- if (NULL == lib_ret)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Could not load plugin `%s'\n",
- libname);
- return;
- }
- GNUNET_assert (1 < strlen (plugin->name));
- GNUNET_assert ('/' == *plugin->name);
- GNUNET_CRYPTO_hash (plugin->name+1, strlen (plugin->name+1), &key);
- if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_put (plugin_map,
- &key,
- plugin,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Could not load add plugin `%s'\n",
- libname);
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Loaded plugin `%s'\n",
- libname);
- }
- /**
- * Main function that will be run
- *
- * @param cls closure
- * @param args remaining command-line arguments
- * @param cfgfile name of the configuration file used (for saving, can be NULL)
- * @param c configuration
- */
- static void
- run (void *cls,
- char *const *args,
- const char *cfgfile,
- const struct GNUNET_CONFIGURATION_Handle *c)
- {
- cfg = c;
- plugin_map = GNUNET_CONTAINER_multihashmap_create (10, GNUNET_NO);
- /* Get CORS data from cfg */
- if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg, "rest",
- "REST_ALLOW_ORIGIN",
- &allow_origin))
- {
- //No origin specified
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "No CORS Access-Control-Allow-Origin Header will be sent...\n");
- }
- if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg, "rest",
- "REST_ALLOW_HEADERS",
- &allow_headers))
- {
- //No origin specified
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "No CORS Access-Control-Allow-Headers Header will be sent...\n");
- }
- /* Open listen socket proxy */
- lsock6 = bind_v6 ();
- if (NULL == lsock6)
- {
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
- }
- else
- {
- if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock6, 5))
- {
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
- GNUNET_NETWORK_socket_close (lsock6);
- lsock6 = NULL;
- }
- else
- {
- ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
- lsock6, &do_accept, lsock6);
- }
- }
- lsock4 = bind_v4 ();
- if (NULL == lsock4)
- {
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
- }
- else
- {
- if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock4, 5))
- {
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "listen");
- GNUNET_NETWORK_socket_close (lsock4);
- lsock4 = NULL;
- }
- else
- {
- ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
- lsock4, &do_accept, lsock4);
- }
- }
- if ( (NULL == lsock4) &&
- (NULL == lsock6) )
- {
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Service listens on port %llu\n",
- port);
- httpd = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_NO_LISTEN_SOCKET,
- 0,
- NULL, NULL,
- &create_response, NULL,
- MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
- MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb, NULL,
- MHD_OPTION_END);
- if (NULL == httpd)
- {
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
- /* Load plugins */
- GNUNET_PLUGIN_load_all ("libgnunet_plugin_rest",
- (void *) cfg,
- &load_plugin,
- NULL);
- GNUNET_SCHEDULER_add_shutdown (&do_shutdown, NULL);
- }
- /**
- *
- * The main function for gnunet-rest-service
- *
- * @param argc number of arguments from the cli
- * @param argv command line arguments
- * @return 0 ok, 1 on error
- *
- */
- int
- main (int argc, char *const *argv)
- {
- struct GNUNET_GETOPT_CommandLineOption options[] = {
- GNUNET_GETOPT_option_ulong ('p',
- "port",
- "PORT",
- gettext_noop ("listen on specified port (default: 7776)"),
- &port),
- GNUNET_GETOPT_OPTION_END
- };
- static const char* err_page =
- "{}";
- int ret;
- if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
- return 2;
- GNUNET_log_setup ("gnunet-rest-server", "WARNING", NULL);
- failure_response = MHD_create_response_from_buffer (strlen(err_page),
- (void*)err_page,
- MHD_RESPMEM_PERSISTENT);
- ret =
- (GNUNET_OK ==
- GNUNET_PROGRAM_run (argc, argv, "gnunet-rest-server",
- _("GNUnet REST server"),
- options,
- &run, NULL)) ? 0: 1;
- MHD_destroy_response (failure_response);
- GNUNET_free_non_null ((char *) argv);
- return ret;
- }
- /* end of gnunet-rest-server.c */
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