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3 (C) 2007, 2008, 2009, 2010, 2011 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
26 * @author Milan Bouchet-Valat
29 #ifndef GNUNET_NAT_LIB_H
30 #define GNUNET_NAT_LIB_H
32 #include "gnunet_util_lib.h"
35 * Signature of the callback passed to GNUNET_NAT_register for
36 * a function to call whenever our set of 'valid' addresses changes.
39 * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
40 * the previous (now invalid) one
41 * @param addr either the previous or the new public IP address
42 * @param addrlen actual lenght of the address
44 typedef void (*GNUNET_NAT_AddressCallback) (void *cls, int add_remove,
45 const struct sockaddr * addr,
50 * Signature of the callback passed to GNUNET_NAT_register
51 * for a function to call whenever someone asks us to do connection
55 * @param addr public IP address of the other peer
56 * @param addrlen actual lenght of the address
58 typedef void (*GNUNET_NAT_ReversalCallback) (void *cls,
59 const struct sockaddr * addr,
64 * Handle for active NAT registrations.
66 struct GNUNET_NAT_Handle;
70 * Attempt to enable port redirection and detect public IP address contacting
71 * UPnP or NAT-PMP routers on the local network. Use addr to specify to which
72 * of the local host's addresses should the external port be mapped. The port
73 * is taken from the corresponding sockaddr_in[6] field. The NAT module
74 * should call the given callback for any 'plausible' external address.
76 * @param cfg configuration to use
77 * @param is_tcp GNUNET_YES for TCP, GNUNET_NO for UDP
78 * @param adv_port advertised port (port we are either bound to or that our OS
79 * locally performs redirection from to our bound port).
80 * @param num_addrs number of addresses in 'addrs'
81 * @param addrs list of local addresses packets should be redirected to
82 * @param addrlens actual lengths of the addresses
83 * @param address_callback function to call everytime the public IP address changes
84 * @param reversal_callback function to call if someone wants connection reversal from us,
85 * NULL if connection reversal is not supported
86 * @param callback_cls closure for callback
87 * @return NULL on error, otherwise handle that can be used to unregister
89 struct GNUNET_NAT_Handle *GNUNET_NAT_register (const struct
90 GNUNET_CONFIGURATION_Handle *cfg,
91 int is_tcp, uint16_t adv_port,
92 unsigned int num_addrs,
93 const struct sockaddr **addrs,
94 const socklen_t * addrlens,
95 GNUNET_NAT_AddressCallback
97 GNUNET_NAT_ReversalCallback
103 * Test if the given address is (currently) a plausible IP address for this peer.
105 * @param h the handle returned by register
106 * @param addr IP address to test (IPv4 or IPv6)
107 * @param addrlen number of bytes in addr
108 * @return GNUNET_YES if the address is plausible,
109 * GNUNET_NO if the address is not plausible,
110 * GNUNET_SYSERR if the address is malformed
112 int GNUNET_NAT_test_address (struct GNUNET_NAT_Handle *h, const void *addr,
117 * We learned about a peer (possibly behind NAT) so run the
118 * gnunet-nat-client to send dummy ICMP responses to cause
119 * that peer to connect to us (connection reversal).
121 * @param h handle (used for configuration)
122 * @param sa the address of the peer (IPv4-only)
124 void GNUNET_NAT_run_client (struct GNUNET_NAT_Handle *h,
125 const struct sockaddr_in *sa);
130 * Stop port redirection and public IP address detection for the given handle.
131 * This frees the handle, after having sent the needed commands to close open ports.
133 * @param h the handle to stop
135 void GNUNET_NAT_unregister (struct GNUNET_NAT_Handle *h);
139 * Handle to a NAT test.
141 struct GNUNET_NAT_Test;
144 * Function called to report success or failure for
145 * NAT configuration test.
148 * @param success GNUNET_OK on success, GNUNET_NO on failure,
149 * GNUNET_SYSERR if the test could not be
150 * properly started (internal failure)
152 typedef void (*GNUNET_NAT_TestCallback) (void *cls, int success);
155 * Start testing if NAT traversal works using the
156 * given configuration (IPv4-only).
158 * @param cfg configuration for the NAT traversal
159 * @param is_tcp GNUNET_YES to test TCP, GNUNET_NO to test UDP
160 * @param bnd_port port to bind to, 0 for connection reversal
161 * @param adv_port externally advertised port to use
162 * @param report function to call with the result of the test
163 * @param report_cls closure for report
164 * @return handle to cancel NAT test
166 struct GNUNET_NAT_Test *GNUNET_NAT_test_start (const struct
167 GNUNET_CONFIGURATION_Handle *cfg,
168 int is_tcp, uint16_t bnd_port,
170 GNUNET_NAT_TestCallback report,
175 * Stop an active NAT test.
177 * @param tst test to stop.
179 void GNUNET_NAT_test_stop (struct GNUNET_NAT_Test *tst);
183 * Signature of a callback that is given an IP address.
186 * @param addr the address, NULL on errors
188 typedef void (*GNUNET_NAT_IPCallback) (void *cls, const struct in_addr * addr);
193 * Opaque handle to cancel "GNUNET_NAT_mini_get_external_ipv4" operation.
195 struct GNUNET_NAT_ExternalHandle;
199 * Try to get the external IPv4 address of this peer.
201 * @param timeout when to fail
202 * @param cb function to call with result
203 * @param cb_cls closure for 'cb'
204 * @return handle for cancellation (can only be used until 'cb' is called), NULL on error
206 struct GNUNET_NAT_ExternalHandle *GNUNET_NAT_mini_get_external_ipv4 (struct
209 GNUNET_NAT_IPCallback
218 * @param eh operation to cancel
220 void GNUNET_NAT_mini_get_external_ipv4_cancel (struct GNUNET_NAT_ExternalHandle
225 * Handle to a mapping created with upnpc.
227 struct GNUNET_NAT_MiniHandle;
231 * Start mapping the given port using (mini)upnpc. This function
232 * should typically not be used directly (it is used within the
233 * general-purpose 'GNUNET_NAT_register' code). However, it can be
234 * used if specifically UPnP-based NAT traversal is to be used or
237 * @param port port to map
238 * @param is_tcp GNUNET_YES to map TCP, GNUNET_NO for UDP
239 * @param ac function to call with mapping result
240 * @param ac_cls closure for 'ac'
241 * @return NULL on error
243 struct GNUNET_NAT_MiniHandle *GNUNET_NAT_mini_map_start (uint16_t port,
245 GNUNET_NAT_AddressCallback
250 * Remove a mapping created with (mini)upnpc. Calling
251 * this function will give 'upnpc' 1s to remove tha mapping,
252 * so while this function is non-blocking, a task will be
253 * left with the scheduler for up to 1s past this call.
255 * @param mini the handle
257 void GNUNET_NAT_mini_map_stop (struct GNUNET_NAT_MiniHandle *mini);
262 /* end of gnunet_nat_lib.h */