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3 (C) 2007-2014 Christian Grothoff (and other contributing authors)
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22 * @file include/gnunet_nat_lib.h
23 * @brief Library handling UPnP and NAT-PMP port forwarding and
24 * external IP address retrieval
25 * @author Christian Grothoff
26 * @author Milan Bouchet-Valat
29 #ifndef GNUNET_NAT_LIB_H
30 #define GNUNET_NAT_LIB_H
32 #include "gnunet_util_lib.h"
36 * Signature of the callback passed to #GNUNET_NAT_register() for
37 * a function to call whenever our set of 'valid' addresses changes.
40 * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO to mean
41 * the previous (now invalid) one
42 * @param addr either the previous or the new public IP address
43 * @param addrlen actual length of the @a addr
46 (*GNUNET_NAT_AddressCallback) (void *cls,
48 const struct sockaddr *addr,
53 * Signature of the callback passed to #GNUNET_NAT_register().
54 * for a function to call whenever someone asks us to do connection
58 * @param addr public IP address of the other peer
59 * @param addrlen actual lenght of the @a addr
62 (*GNUNET_NAT_ReversalCallback) (void *cls,
63 const struct sockaddr *addr,
68 * Handle for active NAT registrations.
70 struct GNUNET_NAT_Handle;
74 * Error Types for the NAT subsystem (which can then later be converted/resolved to a string)
76 enum GNUNET_NAT_FailureCode
81 GNUNET_NAT_ERROR_SUCCESS = GNUNET_OK,
84 * `upnpc` command not found
86 GNUNET_NAT_ERROR_UPNPC_NOT_FOUND,
89 * Failed to run `upnpc` command
91 GNUNET_NAT_ERROR_UPNPC_FAILED,
94 * `upnpc' command took too long, process killed
96 GNUNET_NAT_ERROR_UPNPC_TIMEOUT,
99 * `upnpc' command failed to establish port mapping
101 GNUNET_NAT_ERROR_UPNPC_PORTMAP_FAILED,
104 * `external-ip' command not found
106 GNUNET_NAT_ERROR_EXTERNAL_IP_UTILITY_NOT_FOUND,
109 * "no valid address was returned by `external-ip'"
111 GNUNET_NAT_ERROR_EXTERNAL_IP_NO_VALID_ADDRESS_FOUND,
122 * Attempt to enable port redirection and detect public IP address
123 * contacting UPnP or NAT-PMP routers on the local network. Use addr
124 * to specify to which of the local host's addresses should the
125 * external port be mapped. The port is taken from the corresponding
126 * sockaddr_in[6] field. The NAT module should call the given
127 * callback for any 'plausible' external address.
129 * @param cfg configuration to use
130 * @param is_tcp #GNUNET_YES for TCP, #GNUNET_NO for UDP
131 * @param adv_port advertised port (port we are either bound to or that our OS
132 * locally performs redirection from to our bound port).
133 * @param num_addrs number of addresses in @a addrs
134 * @param addrs list of local addresses packets should be redirected to
135 * @param addrlens actual lengths of the addresses in @a addrs
136 * @param address_callback function to call everytime the public IP address changes
137 * @param reversal_callback function to call if someone wants connection reversal from us,
138 * NULL if connection reversal is not supported
139 * @param callback_cls closure for callbacks
140 * @return NULL on error, otherwise handle that can be used to unregister
142 struct GNUNET_NAT_Handle *
143 GNUNET_NAT_register (const struct GNUNET_CONFIGURATION_Handle *cfg,
146 unsigned int num_addrs,
147 const struct sockaddr **addrs,
148 const socklen_t *addrlens,
149 GNUNET_NAT_AddressCallback address_callback,
150 GNUNET_NAT_ReversalCallback reversal_callback,
155 * Test if the given address is (currently) a plausible IP address for
158 * @param h the handle returned by register
159 * @param addr IP address to test (IPv4 or IPv6)
160 * @param addrlen number of bytes in @a addr
161 * @return #GNUNET_YES if the address is plausible,
162 * #GNUNET_NO if the address is not plausible,
163 * #GNUNET_SYSERR if the address is malformed
166 GNUNET_NAT_test_address (struct GNUNET_NAT_Handle *h,
172 * We learned about a peer (possibly behind NAT) so run the
173 * gnunet-nat-client to send dummy ICMP responses to cause
174 * that peer to connect to us (connection reversal).
176 * @param h handle (used for configuration)
177 * @param sa the address of the peer (IPv4-only)
178 * @return #GNUNET_SYSERR on error, #GNUNET_NO if nat client is disabled,
179 * #GNUNET_OK otherwise
182 GNUNET_NAT_run_client (struct GNUNET_NAT_Handle *h,
183 const struct sockaddr_in *sa);
187 * Stop port redirection and public IP address detection for the given
188 * handle. This frees the handle, after having sent the needed
189 * commands to close open ports.
191 * @param h the handle to stop
194 GNUNET_NAT_unregister (struct GNUNET_NAT_Handle *h);
198 * Handle to a NAT test.
200 struct GNUNET_NAT_Test;
204 * Function called to report success or failure for
205 * NAT configuration test.
208 * @param result #GNUNET_NAT_ERROR_SUCCESS on success, otherwise the specific error code
210 typedef void (*GNUNET_NAT_TestCallback) (void *cls,
211 enum GNUNET_NAT_FailureCode result);
215 * Start testing if NAT traversal works using the
216 * given configuration (IPv4-only).
218 * @param cfg configuration for the NAT traversal
219 * @param is_tcp #GNUNET_YES to test TCP, #GNUNET_NO to test UDP
220 * @param bnd_port port to bind to, 0 for connection reversal
221 * @param adv_port externally advertised port to use
222 * @param report function to call with the result of the test
223 * @param report_cls closure for @a report
224 * @return handle to cancel NAT test
226 struct GNUNET_NAT_Test *
227 GNUNET_NAT_test_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
231 GNUNET_NAT_TestCallback report,
236 * Stop an active NAT test.
238 * @param tst test to stop.
241 GNUNET_NAT_test_stop (struct GNUNET_NAT_Test *tst);
245 * Signature of a callback that is given an IP address.
248 * @param addr the address, NULL on errors
249 * @param result GNUNET_NAT_ERROR_SUCCESS on success, otherwise the specific error code
251 typedef void (*GNUNET_NAT_IPCallback) (void *cls,
252 const struct in_addr *addr,
253 enum GNUNET_NAT_FailureCode result);
258 * Opaque handle to cancel #GNUNET_NAT_mini_get_external_ipv4() operation.
260 struct GNUNET_NAT_ExternalHandle;
264 * Try to get the external IPv4 address of this peer.
266 * @param timeout when to fail
267 * @param cb function to call with result
268 * @param cb_cls closure for @a cb
269 * @return handle for cancellation (can only be used until @a cb is called), NULL on error
271 struct GNUNET_NAT_ExternalHandle *
272 GNUNET_NAT_mini_get_external_ipv4 (struct GNUNET_TIME_Relative timeout,
273 GNUNET_NAT_IPCallback cb,
280 * @param eh operation to cancel
283 GNUNET_NAT_mini_get_external_ipv4_cancel (struct GNUNET_NAT_ExternalHandle *eh);
287 * Handle to a mapping created with upnpc.
289 struct GNUNET_NAT_MiniHandle;
293 * Signature of the callback passed to #GNUNET_NAT_register() for
294 * a function to call whenever our set of 'valid' addresses changes.
297 * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO to mean
298 * the previous (now invalid) one, #GNUNET_SYSERR indicates an error
299 * @param addr either the previous or the new public IP address
300 * @param addrlen actual length of the @a addr
301 * @param result GNUNET_NAT_ERROR_SUCCESS on success, otherwise the specific error code
304 (*GNUNET_NAT_MiniAddressCallback) (void *cls,
306 const struct sockaddr *addr,
308 enum GNUNET_NAT_FailureCode result);
312 * Start mapping the given port using (mini)upnpc. This function
313 * should typically not be used directly (it is used within the
314 * general-purpose #GNUNET_NAT_register() code). However, it can be
315 * used if specifically UPnP-based NAT traversal is to be used or
318 * @param port port to map
319 * @param is_tcp #GNUNET_YES to map TCP, #GNUNET_NO for UDP
320 * @param ac function to call with mapping result
321 * @param ac_cls closure for @a ac
322 * @return NULL on error
324 struct GNUNET_NAT_MiniHandle *
325 GNUNET_NAT_mini_map_start (uint16_t port,
327 GNUNET_NAT_MiniAddressCallback ac,
332 * Remove a mapping created with (mini)upnpc. Calling
333 * this function will give 'upnpc' 1s to remove the mapping,
334 * so while this function is non-blocking, a task will be
335 * left with the scheduler for up to 1s past this call.
337 * @param mini the handle
340 GNUNET_NAT_mini_map_stop (struct GNUNET_NAT_MiniHandle *mini);
344 * Handle to auto-configuration in progress.
346 struct GNUNET_NAT_AutoHandle;
350 * Function called with the result from the autoconfiguration.
353 * @param diff minimal suggested changes to the original configuration
354 * to make it work (as best as we can)
355 * @param result GNUNET_NAT_ERROR_SUCCESS on success, otherwise the specific error code
358 (*GNUNET_NAT_AutoResultCallback)(void *cls,
359 const struct GNUNET_CONFIGURATION_Handle *diff,
360 enum GNUNET_NAT_FailureCode result);
364 * Start auto-configuration routine. The resolver service should
365 * be available when this function is called.
367 * @param cfg initial configuration
368 * @param cb function to call with autoconfiguration result
369 * @param cb_cls closure for @a cb
370 * @return handle to cancel operation
372 struct GNUNET_NAT_AutoHandle *
373 GNUNET_NAT_autoconfig_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
374 GNUNET_NAT_AutoResultCallback cb,
379 * Abort autoconfiguration.
381 * @param ah handle for operation to abort
384 GNUNET_NAT_autoconfig_cancel (struct GNUNET_NAT_AutoHandle *ah);
388 /* end of gnunet_nat_lib.h */