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22 * @file util/service_new.c
23 * @brief functions related to starting services (redesign)
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_protocols.h"
29 #include "gnunet_constants.h"
30 #include "gnunet_resolver_service.h"
34 * Information the service tracks per listen operation.
36 struct ServiceListenContext
42 struct ServiceListenContext *next;
47 struct ServiceListenContext *prev;
50 * Service this listen context belongs to.
52 struct GNUNET_SERVICE_Handle *sh;
55 * Socket we are listening on.
57 struct GNUNET_NETWORK_Handle *listen_socket;
60 * Task scheduled to do the listening.
62 struct GNUNET_SCHEDULER_Task *listen_task;
68 * Handle to a service.
70 struct GNUNET_SERVICE_Handle
75 const struct GNUNET_CONFIGURATION_Handle *cfg;
78 * Name of our service.
80 const char *service_name;
83 * Main service-specific task to run.
85 GNUNET_SERVICE_InitCallback service_init_cb;
88 * Function to call when clients connect.
90 GNUNET_SERVICE_ConnectHandler connect_cb;
93 * Function to call when clients disconnect / are disconnected.
95 GNUNET_SERVICE_DisconnectHandler disconnect_cb;
98 * Closure for @e service_init_cb, @e connect_cb, @e disconnect_cb.
103 * DLL of listen sockets used to accept new connections.
105 struct ServiceListenContext *slc_head;
108 * DLL of listen sockets used to accept new connections.
110 struct ServiceListenContext *slc_tail;
113 * Message handlers to use for all clients.
115 const struct GNUNET_MQ_MessageHandler *handlers;
118 * Closure for @e task.
123 * IPv4 addresses that are not allowed to connect.
125 struct GNUNET_STRINGS_IPv4NetworkPolicy *v4_denied;
128 * IPv6 addresses that are not allowed to connect.
130 struct GNUNET_STRINGS_IPv6NetworkPolicy *v6_denied;
133 * IPv4 addresses that are allowed to connect (if not
134 * set, all are allowed).
136 struct GNUNET_STRINGS_IPv4NetworkPolicy *v4_allowed;
139 * IPv6 addresses that are allowed to connect (if not
140 * set, all are allowed).
142 struct GNUNET_STRINGS_IPv6NetworkPolicy *v6_allowed;
145 * Do we require a matching UID for UNIX domain socket connections?
146 * #GNUNET_NO means that the UID does not have to match (however,
147 * @e match_gid may still impose other access control checks).
152 * Do we require a matching GID for UNIX domain socket connections?
153 * Ignored if @e match_uid is #GNUNET_YES. Note that this is about
154 * checking that the client's UID is in our group OR that the
155 * client's GID is our GID. If both "match_gid" and @e match_uid are
156 * #GNUNET_NO, all users on the local system have access.
163 enum GNUNET_SERVICE_Options options;
169 * Handle to a client that is connected to a service.
171 struct GNUNET_SERVICE_Client
175 * Server that this client belongs to.
177 struct GNUNET_SERVER_Handle *server;
180 * Task that warns about missing calls to
181 * #GNUNET_SERVICE_client_continue().
183 struct GNUNET_SCHEDULER_Task *warn_task;
186 * User context value, value returned from
187 * the connect callback.
192 * Persist the file handle for this client no matter what happens,
193 * force the OS to close once the process actually dies. Should only
194 * be used in special cases!
199 * Is this client a 'monitor' client that should not be counted
200 * when deciding on destroying the server during soft shutdown?
201 * (see also #GNUNET_SERVICE_start)
206 * Type of last message processed (for warn_no_receive_done).
213 service_main (void *cls)
215 struct GNUNET_SERVICE_Handle *sh = cls;
217 GNUNET_SCHEDULER_add_shutdown (&service_shutdown,
219 GNUNET_SERVICE_resume (sh);
220 sh->service_init_cb (sh->cb_cls,
227 * Creates the "main" function for a GNUnet service. You
228 * should almost always use the #GNUNET_SERVICE_MAIN macro
229 * instead of calling this function directly (except
230 * for ARM, which should call this function directly).
232 * The function will launch the service with the name @a service_name
233 * using the @a service_options to configure its shutdown
234 * behavior. Once the service is ready, the @a init_cb will be called
235 * for service-specific initialization. @a init_cb will be given the
236 * service handler which can be used to control the service's
237 * availability. When clients connect or disconnect, the respective
238 * @a connect_cb or @a disconnect_cb functions will be called. For
239 * messages received from the clients, the respective @a handlers will
240 * be invoked; for the closure of the handlers we use the return value
241 * from the @a connect_cb invocation of the respective client.
243 * Each handler MUST call #GNUNET_SERVICE_client_continue() after each
244 * message to receive further messages from this client. If
245 * #GNUNET_SERVICE_client_continue() is not called within a short
246 * time, a warning will be logged. If delays are expected, services
247 * should call #GNUNET_SERVICE_client_disable_continue_warning() to
248 * disable the warning.
250 * Clients sending invalid messages (based on @a handlers) will be
251 * dropped. Additionally, clients can be dropped at any time using
252 * #GNUNET_SERVICE_client_drop().
254 * @param argc number of command-line arguments in @a argv
255 * @param argv array of command-line arguments
256 * @param service_name name of the service to run
257 * @param options options controlling shutdown of the service
258 * @param service_init_cb function to call once the service is ready
259 * @param connect_cb function to call whenever a client connects
260 * @param disconnect_cb function to call whenever a client disconnects
261 * @param cls closure argument for @a service_init_cb, @a connect_cb and @a disconnect_cb
262 * @param handlers NULL-terminated array of message handlers for the service,
263 * the closure will be set to the value returned by
264 * the @a connect_cb for the respective connection
265 * @return 0 on success, non-zero on error
268 GNUNET_SERVICE_ruN_ (int argc,
270 const char *service_name,
271 enum GNUNET_SERVICE_Options options,
272 GNUNET_SERVICE_InitCallback service_init_cb,
273 GNUNET_SERVICE_ConnectHandler connect_cb,
274 GNUNET_SERVICE_DisconnectHandler disconnect_cb,
276 const struct GNUNET_MQ_MessageHandler *handlers)
278 struct GNUNET_SERVICE_Handle sh;
280 // FIXME: setup (parse command line, configuration, init sh)
281 GNUNET_SCHEDULER_run (&service_main,
289 * Suspend accepting connections from the listen socket temporarily.
290 * Resume activity using #GNUNET_SERVICE_resume.
292 * @param sh service to stop accepting connections.
295 GNUNET_SERVICE_suspend (struct GNUNET_SERVICE_Handle *sh)
297 GNUNET_break (0); // not implemented
302 * Resume accepting connections from the listen socket.
304 * @param sh service to resume accepting connections.
307 GNUNET_SERVICE_resume (struct GNUNET_SERVICE_Handle *sh)
309 GNUNET_break (0); // not implemented
314 * Continue receiving further messages from the given client.
315 * Must be called after each message received.
317 * @param c the client to continue receiving from
320 GNUNET_SERVICE_client_continue (struct GNUNET_SERVICE_Client *c)
322 GNUNET_break (0); // not implemented
327 * Disable the warning the server issues if a message is not
328 * acknowledged in a timely fashion. Use this call if a client is
329 * intentionally delayed for a while. Only applies to the current
332 * @param c client for which to disable the warning
335 GNUNET_SERVICE_client_disable_continue_warning (struct GNUNET_SERVICE_Client *c)
337 GNUNET_break (NULL != c->warn_task);
338 if (NULL != c->warn_task)
340 GNUNET_SCHEDULER_cancel (c->warn_task);
347 * Ask the server to disconnect from the given client. This is the
348 * same as returning #GNUNET_SYSERR within the check procedure when
349 * handling a message, wexcept that it allows dropping of a client even
350 * when not handling a message from that client. The `disconnect_cb`
351 * will be called on @a c even if the application closes the connection
352 * using this function.
354 * @param c client to disconnect now
357 GNUNET_SERVICE_client_drop (struct GNUNET_SERVICE_Client *c)
359 GNUNET_break (0); // not implemented
364 * Stop the listen socket and get ready to shutdown the server once
365 * only clients marked using #GNUNET_SERVER_client_mark_monitor are
368 * @param sh server to stop listening on
371 GNUNET_SERVICE_stop_listening (struct GNUNET_SERVICE_Handle *sh)
373 GNUNET_break (0); // not implemented
378 * Set the 'monitor' flag on this client. Clients which have been
379 * marked as 'monitors' won't prevent the server from shutting down
380 * once #GNUNET_SERVICE_stop_listening() has been invoked. The idea is
381 * that for "normal" clients we likely want to allow them to process
382 * their requests; however, monitor-clients are likely to 'never'
383 * disconnect during shutdown and thus will not be considered when
384 * determining if the server should continue to exist after
385 * shutdown has been triggered.
387 * @param c client to mark as a monitor
390 GNUNET_SERVICE_client_mark_monitor (struct GNUNET_SERVICE_Client *c)
392 GNUNET_break (0); // not implemented
397 * Set the persist option on this client. Indicates that the
398 * underlying socket or fd should never really be closed. Used for
399 * indicating process death.
401 * @param c client to persist the socket (never to be closed)
404 GNUNET_SERVICE_client_persist (struct GNUNET_SERVICE_Client *c)
406 GNUNET_break (0); // not implemented
411 /* end of service_new.c */