2 This file is part of GNUnet.
3 (C) 2007, 2008, 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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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,
46 const struct sockaddr *addr,
51 * Signature of the callback passed to GNUNET_NAT_register
52 * for a function to call whenever someone asks us to do connection
56 * @param addr public IP address of the other peer
57 * @param addrlen actual lenght of the address
59 typedef void (*GNUNET_NAT_ReversalCallback) (void *cls,
60 const struct sockaddr *addr,
65 * Handle for active NAT registrations.
67 struct GNUNET_NAT_Handle;
71 * Attempt to enable port redirection and detect public IP address contacting
72 * UPnP or NAT-PMP routers on the local network. Use addr to specify to which
73 * of the local host's addresses should the external port be mapped. The port
74 * is taken from the corresponding sockaddr_in[6] field. The NAT module
75 * should call the given callback for any 'plausible' external address.
77 * @param cfg configuration to use
78 * @param is_tcp GNUNET_YES for TCP, GNUNET_NO for UDP
79 * @param adv_port advertised port (port we are either bound to or that our OS
80 * locally performs redirection from to our bound port).
81 * @param num_addrs number of addresses in 'addrs'
82 * @param addrs list of local addresses packets should be redirected to
83 * @param addrlens actual lengths of the addresses
84 * @param address_callback function to call everytime the public IP address changes
85 * @param reversal_callback function to call if someone wants connection reversal from us,
86 * NULL if connection reversal is not supported
87 * @param callback_cls closure for callback
88 * @return NULL on error, otherwise handle that can be used to unregister
90 struct GNUNET_NAT_Handle *
91 GNUNET_NAT_register (const struct GNUNET_CONFIGURATION_Handle *cfg,
94 unsigned int num_addrs,
95 const struct sockaddr **addrs,
96 const socklen_t *addrlens,
97 GNUNET_NAT_AddressCallback address_callback,
98 GNUNET_NAT_ReversalCallback reversal_callback,
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
113 GNUNET_NAT_test_address (struct GNUNET_NAT_Handle *h,
119 * We learned about a peer (possibly behind NAT) so run the
120 * gnunet-nat-client to send dummy ICMP responses to cause
121 * that peer to connect to us (connection reversal).
123 * @param h handle (used for configuration)
124 * @param sa the address of the peer (IPv4-only)
127 GNUNET_NAT_run_client (struct GNUNET_NAT_Handle *h,
128 const struct sockaddr_in *sa);
133 * Stop port redirection and public IP address detection for the given handle.
134 * This frees the handle, after having sent the needed commands to close open ports.
136 * @param h the handle to stop
139 GNUNET_NAT_unregister (struct GNUNET_NAT_Handle *h);
143 * Handle to a NAT test.
145 struct GNUNET_NAT_Test;
148 * Function called to report success or failure for
149 * NAT configuration test.
152 * @param success GNUNET_OK on success, GNUNET_NO on failure,
153 * GNUNET_SYSERR if the test could not be
154 * properly started (internal failure)
156 typedef void (*GNUNET_NAT_TestCallback)(void *cls,
160 * Start testing if NAT traversal works using the
161 * given configuration (IPv4-only).
163 * @param cfg configuration for the NAT traversal
164 * @param is_tcp GNUNET_YES to test TCP, GNUNET_NO to test UDP
165 * @param bnd_port port to bind to, 0 for connection reversal
166 * @param adv_port externally advertised port to use
167 * @param report function to call with the result of the test
168 * @param report_cls closure for report
169 * @return handle to cancel NAT test
171 struct GNUNET_NAT_Test *
172 GNUNET_NAT_test_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
176 GNUNET_NAT_TestCallback report,
181 * Stop an active NAT test.
183 * @param tst test to stop.
186 GNUNET_NAT_test_stop (struct GNUNET_NAT_Test *tst);
191 /* end of gnunet_nat_lib.h */