new NAT lib client api skeleton

5 files changed, 480 insertions, 154 deletions

diff --git a/src/include/gnunet_nat_service.h b/src/include/gnunet_nat_service.h
index 5ac936065..28a6bc59f 100644
--- a/src/include/gnunet_nat_service.h
+++ b/src/include/gnunet_nat_service.h
@@ -108,7 +108,8 @@ enum GNUNET_NAT_AddressClass
  * a function to call whenever our set of 'valid' addresses changes.
  *
  * @param cls closure
- * @param add_remove #GNUNET_YES to add a new public IP address, #GNUNET_NO to remove a previous (now invalid) one
+ * @param add_remove #GNUNET_YES to add a new public IP address, 
+ *                   #GNUNET_NO to remove a previous (now invalid) one
  * @param ac address class the address belongs to
  * @param addr either the previous or the new public IP address
  * @param addrlen actual length of the @a addr
@@ -137,24 +138,6 @@ typedef void
 
 
 /**
- * Signature of a callback that is given an IPv4 address
- * which is now presumably a global IPv4 address under which
- * this peer is visible (external IP address of our NAT).
- * Note that the NAT may not have punched holes, so it is 
- * possible that while this is "our" IPv4 address, it still
- * does not work for receiving traffic.
- *
- * @param cls closure
- * @param add_remove #GNUNET_YES to add a new public IP address, #GNUNET_NO to remove a previous (now invalid) one
- * @param addr the address to add or remove
- */
-typedef void
-(*GNUNET_NAT_IPv4Callback) (void *cls,
-                            int add_remove,
-                            const struct in_addr *addr);
-
-
-/**
  * Handle for active NAT registrations.
  */
 struct GNUNET_NAT_Handle;
@@ -175,7 +158,6 @@ struct GNUNET_NAT_Handle;
  * @param num_addrs number of addresses in @a addrs
  * @param addrs list of local addresses packets should be redirected to
  * @param addrlens actual lengths of the addresses in @a addrs
- * @param ip_callback function to call whenever our (external) IPv4 address changes (or becomes known)
  * @param address_callback function to call everytime the public IP address changes
  * @param reversal_callback function to call if someone wants connection reversal from us,
  *        NULL if connection reversal is not supported
@@ -184,12 +166,11 @@ struct GNUNET_NAT_Handle;
  */
 struct GNUNET_NAT_Handle *
 GNUNET_NAT_register (const struct GNUNET_CONFIGURATION_Handle *cfg,
-                     int proto,
+                     uint8_t proto,
                      uint16_t adv_port,
                      unsigned int num_addrs,
                      const struct sockaddr **addrs,
                      const socklen_t *addrlens,
-                     GNUNET_NAT_IPv4Callback ip_callback,
                      GNUNET_NAT_AddressCallback address_callback,
                      GNUNET_NAT_ReversalCallback reversal_callback,
                      void *callback_cls);
@@ -209,7 +190,7 @@ GNUNET_NAT_register (const struct GNUNET_CONFIGURATION_Handle *cfg,
  * At the moment this only processes BIND requests, and returns the
  * externally visible address of the request. 
  *
- * @param nat handle to the NAT service
+ * @param nh handle to the NAT service
  * @param sender_addr address from which we got @a data
  * @param data the packet
  * @param data_size number of bytes in @a data
@@ -218,7 +199,7 @@ GNUNET_NAT_register (const struct GNUNET_CONFIGURATION_Handle *cfg,
  *         #GNUNET_SYSERR on internal error handling the packet
  */
 int
-GNUNET_NAT_stun_handle_packet (struct GNUNET_NAT_Handle *nat,
+GNUNET_NAT_stun_handle_packet (struct GNUNET_NAT_Handle *nh,
                                const struct sockaddr *sender_addr,
                                const void *data,
                                size_t data_size);
@@ -230,7 +211,7 @@ GNUNET_NAT_stun_handle_packet (struct GNUNET_NAT_Handle *nat,
  * have to explicitly track all IPs that the #GNUNET_NAT_AddressCallback
  * has returned so far.
  *
- * @param h the handle returned by register
+ * @param nh the handle returned by register
  * @param addr IP address to test (IPv4 or IPv6)
  * @param addrlen number of bytes in @a addr
  * @return #GNUNET_YES if the address is plausible,
@@ -238,7 +219,7 @@ GNUNET_NAT_stun_handle_packet (struct GNUNET_NAT_Handle *nat,
  *         #GNUNET_SYSERR if the address is malformed
  */
 int
-GNUNET_NAT_test_address (struct GNUNET_NAT_Handle *h,
+GNUNET_NAT_test_address (struct GNUNET_NAT_Handle *nh,
                          const void *addr,
                          socklen_t addrlen);
 
@@ -248,7 +229,7 @@ GNUNET_NAT_test_address (struct GNUNET_NAT_Handle *h,
  * gnunet-nat-client to send dummy ICMP responses to cause
  * that peer to connect to us (connection reversal).
  *
- * @param h handle (used for configuration)
+ * @param nh handle (used for configuration)
  * @param local_sa our local address of the peer (IPv4-only)
  * @param remote_sa the remote address of the peer (IPv4-only)
  * @return #GNUNET_SYSERR on error, 
@@ -256,7 +237,7 @@ GNUNET_NAT_test_address (struct GNUNET_NAT_Handle *h,
  *         #GNUNET_OK otherwise (presumably in progress)
  */
 int
-GNUNET_NAT_request_reversal (struct GNUNET_NAT_Handle *h,
+GNUNET_NAT_request_reversal (struct GNUNET_NAT_Handle *nh,
                              const struct sockaddr_in *local_sa,
                              const struct sockaddr_in *remote_sa);
 
@@ -266,10 +247,10 @@ GNUNET_NAT_request_reversal (struct GNUNET_NAT_Handle *h,
  * handle.  This frees the handle, after having sent the needed
  * commands to close open ports.
  *
- * @param h the handle to stop
+ * @param nh the handle to unregister
  */
 void
-GNUNET_NAT_unregister (struct GNUNET_NAT_Handle *h);
+GNUNET_NAT_unregister (struct GNUNET_NAT_Handle *nh);
 
 
 /**
@@ -279,82 +260,6 @@ struct GNUNET_NAT_Test;
 
 
 /**
- * Function called to report success or failure for
- * NAT configuration test.
- *
- * @param cls closure
- * @param result #GNUNET_NAT_ERROR_SUCCESS on success, otherwise the specific error code
- */
-typedef void
-(*GNUNET_NAT_TestCallback) (void *cls,
-                            enum GNUNET_NAT_StatusCode result);
-
-
-/**
- * Start testing if NAT traversal works using the given configuration
- * (IPv4-only).  The transport adapters should be down while using
- * this function.
- *
- * @param cfg configuration for the NAT traversal
- * @param proto protocol to test, i.e. IPPROTO_TCP or IPPROTO_UDP
- * @param bnd_port port to bind to, 0 to test connection reversal
- * @param adv_port externally advertised port to use
- * @param report function to call with the result of the test
- * @param report_cls closure for @a report
- * @return handle to cancel NAT test
- */
-struct GNUNET_NAT_Test *
-GNUNET_NAT_test_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
-                       int proto,
-                       uint16_t bnd_port,
-                       uint16_t adv_port,
-                       GNUNET_NAT_TestCallback report,
-                       void *report_cls);
-
-
-/**
- * Stop an active NAT test.
- *
- * @param tst test to stop.
- */
-void
-GNUNET_NAT_test_stop (struct GNUNET_NAT_Test *tst);
-
-
-/**
- * Handle to auto-configuration in progress.
- */
-struct GNUNET_NAT_AutoHandle;
-
-
-/**
- * What the situation of the NAT connectivity
- */
-enum GNUNET_NAT_Type
-{
-  /**
-   * We have a direct connection
-   */
-  GNUNET_NAT_TYPE_NO_NAT = GNUNET_OK,
-
-  /**
-   * We are under a NAT but cannot traverse it
-   */
-  GNUNET_NAT_TYPE_UNREACHABLE_NAT,
-
-  /**
-   * We can traverse using STUN
-   */
-  GNUNET_NAT_TYPE_STUN_PUNCHED_NAT,
-
-  /**
-   * WE can traverse using UPNP
-   */
-  GNUNET_NAT_TYPE_UPNP_NAT
-
-};
-
-/**
  * Error Types for the NAT subsystem (which can then later be converted/resolved to a string)
  */
 enum GNUNET_NAT_StatusCode
@@ -458,6 +363,87 @@ enum GNUNET_NAT_StatusCode
 
 
 /**
+ * Function called to report success or failure for
+ * NAT configuration test.
+ *
+ * @param cls closure
+ * @param result #GNUNET_NAT_ERROR_SUCCESS on success, otherwise the specific error code
+ */
+typedef void
+(*GNUNET_NAT_TestCallback) (void *cls,
+                            enum GNUNET_NAT_StatusCode result);
+
+
+/**
+ * Start testing if NAT traversal works using the given configuration
+ * (IPv4-only).  The transport adapters should be down while using
+ * this function.
+ *
+ * @param cfg configuration for the NAT traversal
+ * @param proto protocol to test, i.e. IPPROTO_TCP or IPPROTO_UDP
+ * @param bind_ip IPv4 address to bind to
+ * @param bnd_port port to bind to, 0 to test connection reversal
+ * @param extern_ip IPv4 address to externally advertise
+ * @param extern_port externally advertised port to use
+ * @param report function to call with the result of the test
+ * @param report_cls closure for @a report
+ * @return handle to cancel NAT test
+ */
+struct GNUNET_NAT_Test *
+GNUNET_NAT_test_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
+                       uint8_t proto,
+                       struct in_addr bind_ip,
+                       uint16_t bnd_port,
+                       struct in_addr extern_ip,
+                       uint16_t extern_port,
+                       GNUNET_NAT_TestCallback report,
+                       void *report_cls);
+
+
+/**
+ * Stop an active NAT test.
+ *
+ * @param tst test to stop.
+ */
+void
+GNUNET_NAT_test_stop (struct GNUNET_NAT_Test *tst);
+
+
+/**
+ * Handle to auto-configuration in progress.
+ */
+struct GNUNET_NAT_AutoHandle;
+
+
+/**
+ * What the situation of the NAT connectivity
+ */
+enum GNUNET_NAT_Type
+{
+  /**
+   * We have a direct connection
+   */
+  GNUNET_NAT_TYPE_NO_NAT = GNUNET_OK,
+
+  /**
+   * We are under a NAT but cannot traverse it
+   */
+  GNUNET_NAT_TYPE_UNREACHABLE_NAT,
+
+  /**
+   * We can traverse using STUN
+   */
+  GNUNET_NAT_TYPE_STUN_PUNCHED_NAT,
+
+  /**
+   * WE can traverse using UPNP
+   */
+  GNUNET_NAT_TYPE_UPNP_NAT
+
+};
+
+
+/**
  * Converts `enum GNUNET_NAT_StatusCode` to string
  *
  * @param err error code to resolve to a string
diff --git a/src/include/gnunet_protocols.h b/src/include/gnunet_protocols.h
index aeb55f99f..ea94645c5 100644
--- a/src/include/gnunet_protocols.h
+++ b/src/include/gnunet_protocols.h
@@ -2810,30 +2810,24 @@ extern "C"
 #define GNUNET_MESSAGE_TYPE_NAT_ADDRESS_CHANGE 1064
 
 /**
- * Message to from NAT service notifying us that one of our
- * "global" IPv4 addresses changed.
- */
-#define GNUNET_MESSAGE_TYPE_NAT_IPV4_CHANGE 1065
-
-/**
  * Message to ask NAT service to test an address.
  */
-#define GNUNET_MESSAGE_TYPE_NAT_REQUEST_TEST 1066
+#define GNUNET_MESSAGE_TYPE_NAT_REQUEST_TEST 1065
 
 /**
  * Message from NAT service with the address test result.
  */
-#define GNUNET_MESSAGE_TYPE_NAT_TEST_RESULT 1067
+#define GNUNET_MESSAGE_TYPE_NAT_TEST_RESULT 1066
 
 /**
  * Message to ask NAT service to request autoconfiguration.
  */
-#define GNUNET_MESSAGE_TYPE_NAT_REQUEST_AUTO_CFG 1068
+#define GNUNET_MESSAGE_TYPE_NAT_REQUEST_AUTO_CFG 1067
 
 /**
  * Message from NAT service with the autoconfiguration result.
  */
-#define GNUNET_MESSAGE_TYPE_NAT_AUTO_CFG_RESULT 1069
+#define GNUNET_MESSAGE_TYPE_NAT_AUTO_CFG_RESULT 1068
 
 
 /**
diff --git a/src/nat/Makefile.am b/src/nat/Makefile.am
index 5e89ac24d..e4b013916 100644
--- a/src/nat/Makefile.am
+++ b/src/nat/Makefile.am
@@ -52,7 +52,7 @@ gnunet_helper_nat_server_SOURCES = \
 gnunet_helper_nat_client_SOURCES = \
  $(NATCLIENT)         
 
- 
+
 gnunet_nat_SOURCES = \
 gnunet-nat.c nat.h
 gnunet_nat_LDADD = \
@@ -64,7 +64,9 @@ if USE_COVERAGE
   AM_CFLAGS = -fprofile-arcs -ftest-coverage
 endif
 
-lib_LTLIBRARIES = libgnunetnat.la
+lib_LTLIBRARIES = \
+  libgnunetnat.la \
+  libgnunetnatnew.la 
 
 libgnunetnat_la_SOURCES = \
   nat.c nat.h \
@@ -72,15 +74,22 @@ libgnunetnat_la_SOURCES = \
   nat_test.c \
   nat_mini.c \
   nat_stun.c
-
 libgnunetnat_la_LIBADD = \
   $(top_builddir)/src/util/libgnunetutil.la \
   $(GN_LIBINTL) @EXT_LIBS@ 
-
 libgnunetnat_la_LDFLAGS = \
   $(GN_LIB_LDFLAGS) $(WINFLAGS) \
   -version-info 1:1:1
 
+libgnunetnatnew_la_SOURCES = \
+  nat_api.c nat.h
+libgnunetnatnew_la_LIBADD = \
+  $(top_builddir)/src/util/libgnunetutil.la \
+  $(GN_LIBINTL) @EXT_LIBS@ 
+libgnunetnatnew_la_LDFLAGS = \
+  $(GN_LIB_LDFLAGS) $(WINFLAGS) \
+  -version-info 2:0:0
+
 check_PROGRAMS = \
   test_nat \
   test_nat_mini \
diff --git a/src/nat/nat.h b/src/nat/nat.h
index 9ab402c1d..debe011ef 100644
--- a/src/nat/nat.h
+++ b/src/nat/nat.h
@@ -77,21 +77,15 @@ enum GNUNET_NAT_RegisterFlags
   GNUNET_NAT_RF_NONE = 0,
 
   /**
-   * This client wants to be informed about our IPv4 address
-   * changing.
-   */
-  GNUNET_NAT_RF_IPV4 = 1,
-
-  /**
    * This client wants to be informed about changes to our
    * external addresses.
    */
-  GNUNET_NAT_RF_ADDRESSES = 2,
+  GNUNET_NAT_RF_ADDRESSES = 1,
 
   /**
    * This client supports address reversal.
    */
-  GNUNET_NAT_RF_REVERSAL = 4
+  GNUNET_NAT_RF_REVERSAL = 2
 };
 
 
@@ -108,12 +102,12 @@ struct GNUNET_NAT_RegisterMessage
   /**
    * An `enum GNUNET_NAT_RegisterFlags`.
    */
-  uint8_t flags GNUNET_PACKED;
+  uint8_t flags;
 
   /**
    * Client's IPPROTO, e.g. IPPROTO_UDP or IPPROTO_TCP.
    */
-  uint8_t proto GNUNET_PACKED;
+  uint8_t proto;
 
   /**
    * Port we would like as we are configured to use this one for
@@ -236,30 +230,6 @@ struct GNUNET_NAT_AddressChangeNotificationMessage
 
 
 /**
- * Service notifying the client about a change of our
- * known external IPv4 address.
- */
-struct GNUNET_NAT_Ipv4ChangeNotificationMessage
-{
-  /**
-   * Header with type #GNUNET_MESSAGE_TYPE_NAT_IPV4_CHANGE
-   */
-  struct GNUNET_MessageHeader header;
-
-  /**
-   * #GNUNET_YES to add, #GNUNET_NO to remove the address from the list.
-   */ 
-  int32_t add_remove GNUNET_PACKED;
-
-  /**
-   * IPv4 address affected.
-   */
-  struct in_addr addr GNUNET_PACKED;
-  
-};
-
-
-/**
  * Client requesting test of network connectivity.
  */
 struct GNUNET_NAT_RequestTestMessage
diff --git a/src/nat/nat_api.c b/src/nat/nat_api.c
new file mode 100644
index 000000000..6488fdf88
--- /dev/null
+++ b/src/nat/nat_api.c
@@ -0,0 +1,367 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2007-2016 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 Christian Grothoff
+ * @author Milan Bouchet-Valat
+ *
+ * @file nat/nat_api.c
+ * Service for handling UPnP and NAT-PMP port forwarding
+ * and external IP address retrieval
+ */
+#include "platform.h"
+#include "gnunet_nat_service.h"
+
+
+/**
+ * Handle for active NAT registrations.
+ */
+struct GNUNET_NAT_Handle
+{
+
+  /**
+   * Configuration we use.
+   */
+  const struct GNUNET_CONFIGURATION_Handle *cfg;
+  
+  /**
+   * Message queue for communicating with the NAT service.
+   */
+  struct GNUNET_MQ_Handle *mq;
+
+  /**
+   * Our registration message.
+   */
+  struct GNUNET_MessageHeader *reg;
+  
+  /**
+   * Function to call when our addresses change.
+   */
+  GNUNET_NAT_AddressCallback address_callback;
+  
+  /**
+   * Function to call when another peer requests connection reversal.
+   */
+  GNUNET_NAT_ReversalCallback reversal_callback;
+  
+  /**
+   * Closure for the various callbacks.
+   */
+  void *callback_cls;
+
+};
+
+
+/**
+ * Attempt to enable port redirection and detect public IP address
+ * contacting UPnP or NAT-PMP routers on the local network. Use @a
+ * addr to specify to which of the local host's addresses should the
+ * external port be mapped. The port is taken from the corresponding
+ * sockaddr_in[6] field.  The NAT module should call the given @a
+ * address_callback for any 'plausible' external address.
+ *
+ * @param cfg configuration to use
+ * @param proto protocol this is about, IPPROTO_TCP or IPPROTO_UDP
+ * @param adv_port advertised port (port we are either bound to or that our OS
+ *                 locally performs redirection from to our bound port).
+ * @param num_addrs number of addresses in @a addrs
+ * @param addrs list of local addresses packets should be redirected to
+ * @param addrlens actual lengths of the addresses in @a addrs
+ * @param address_callback function to call everytime the public IP address changes
+ * @param reversal_callback function to call if someone wants connection reversal from us,
+ *        NULL if connection reversal is not supported
+ * @param callback_cls closure for callbacks
+ * @return NULL on error, otherwise handle that can be used to unregister
+ */
+struct GNUNET_NAT_Handle *
+GNUNET_NAT_register (const struct GNUNET_CONFIGURATION_Handle *cfg,
+                     uint8_t proto,
+                     uint16_t adv_port,
+                     unsigned int num_addrs,
+                     const struct sockaddr **addrs,
+                     const socklen_t *addrlens,
+                     GNUNET_NAT_AddressCallback address_callback,
+                     GNUNET_NAT_ReversalCallback reversal_callback,
+                     void *callback_cls)
+{
+  struct GNUNET_NAT_Handle *nh = GNUNET_new (struct GNUNET_NAT_Handle);
+
+  nh->cfg = cfg;
+  nh->address_callback = address_callback;
+  nh->reversal_callback = reversal_callback;
+  nh->callback_cls = callback_cls;
+  GNUNET_break (0);
+  return nh;
+}
+
+
+/**
+ * Handle an incoming STUN message.  This function is useful as
+ * some GNUnet service may be listening on a UDP port and might
+ * thus receive STUN messages while trying to receive other data.
+ * In this case, this function can be used to act as a proper
+ * STUN server (if desired).
+ *
+ * The function does some basic sanity checks on packet size and
+ * content, try to extract a bit of information, and possibly replies
+ * if this is an actual STUN message.
+ * 
+ * At the moment this only processes BIND requests, and returns the
+ * externally visible address of the request. 
+ *
+ * @param nh handle to the NAT service
+ * @param sender_addr address from which we got @a data
+ * @param data the packet
+ * @param data_size number of bytes in @a data
+ * @return #GNUNET_OK on success
+ *         #GNUNET_NO if the packet is not a STUN packet
+ *         #GNUNET_SYSERR on internal error handling the packet
+ */
+int
+GNUNET_NAT_stun_handle_packet (struct GNUNET_NAT_Handle *nh,
+                               const struct sockaddr *sender_addr,
+                               const void *data,
+                               size_t data_size)
+{
+  GNUNET_break (0);
+  return GNUNET_SYSERR;
+}
+
+
+/**
+ * Test if the given address is (currently) a plausible IP address for
+ * this peer.  Mostly a convenience function so that clients do not
+ * have to explicitly track all IPs that the #GNUNET_NAT_AddressCallback
+ * has returned so far.
+ *
+ * @param nh the handle returned by register
+ * @param addr IP address to test (IPv4 or IPv6)
+ * @param addrlen number of bytes in @a addr
+ * @return #GNUNET_YES if the address is plausible,
+ *         #GNUNET_NO if the address is not plausible,
+ *         #GNUNET_SYSERR if the address is malformed
+ */
+int
+GNUNET_NAT_test_address (struct GNUNET_NAT_Handle *nh,
+                         const void *addr,
+                         socklen_t addrlen)
+{
+  GNUNET_break (0);
+  return GNUNET_SYSERR;
+}
+
+
+/**
+ * We learned about a peer (possibly behind NAT) so run the
+ * gnunet-nat-client to send dummy ICMP responses to cause
+ * that peer to connect to us (connection reversal).
+ *
+ * @param nh handle (used for configuration)
+ * @param local_sa our local address of the peer (IPv4-only)
+ * @param remote_sa the remote address of the peer (IPv4-only)
+ * @return #GNUNET_SYSERR on error, 
+ *         #GNUNET_NO if connection reversal is unavailable,
+ *         #GNUNET_OK otherwise (presumably in progress)
+ */
+int
+GNUNET_NAT_request_reversal (struct GNUNET_NAT_Handle *nh,
+                             const struct sockaddr_in *local_sa,
+                             const struct sockaddr_in *remote_sa)
+{
+  GNUNET_break (0);
+  return GNUNET_SYSERR;
+}
+
+
+/**
+ * Stop port redirection and public IP address detection for the given
+ * handle.  This frees the handle, after having sent the needed
+ * commands to close open ports.
+ *
+ * @param nh the handle to stop
+ */
+void
+GNUNET_NAT_unregister (struct GNUNET_NAT_Handle *nh)
+{
+  GNUNET_MQ_destroy (nh->mq);
+  GNUNET_free (nh->reg);
+  GNUNET_free (nh);
+}
+
+
+/**
+ * Handle to a NAT test.
+ */
+struct GNUNET_NAT_Test
+{
+
+  /**
+   * Configuration we use.
+   */
+  const struct GNUNET_CONFIGURATION_Handle *cfg;
+  
+  /**
+   * Message queue for communicating with the NAT service.
+   */
+  struct GNUNET_MQ_Handle *mq;
+
+  /**
+   * Function called to report success or failure for
+   * NAT configuration test.
+   */
+  GNUNET_NAT_TestCallback cb;
+
+  /**
+   * Closure for @e cb.
+   */
+  void *cb_cls;
+
+};
+
+
+/**
+ * Start testing if NAT traversal works using the given configuration
+ * (IPv4-only).  The transport adapters should be down while using
+ * this function.
+ *
+ * @param cfg configuration for the NAT traversal
+ * @param proto protocol to test, i.e. IPPROTO_TCP or IPPROTO_UDP
+ * @param bind_ip IPv4 address to bind to
+ * @param bnd_port port to bind to, 0 to test connection reversal
+ * @param extern_ip IPv4 address to externally advertise
+ * @param extern_port externally advertised port to use
+ * @param report function to call with the result of the test
+ * @param report_cls closure for @a report
+ * @return handle to cancel NAT test
+ */
+struct GNUNET_NAT_Test *
+GNUNET_NAT_test_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
+                       uint8_t proto,
+                       struct in_addr bind_ip,
+                       uint16_t bnd_port,
+                       struct in_addr extern_ip,
+                       uint16_t extern_port,
+                       GNUNET_NAT_TestCallback report,
+                       void *report_cls)
+{
+  struct GNUNET_NAT_Test *tst = GNUNET_new (struct GNUNET_NAT_Test);
+
+  tst->cb = report;
+  tst->cb_cls = report_cls;
+  GNUNET_break (0);
+  return tst;
+}
+
+
+/**
+ * Stop an active NAT test.
+ *
+ * @param tst test to stop.
+ */
+void
+GNUNET_NAT_test_stop (struct GNUNET_NAT_Test *tst)
+{
+  GNUNET_break (0);
+  GNUNET_MQ_destroy (tst->mq);
+  GNUNET_free (tst);
+}
+
+
+/**
+ * Handle to auto-configuration in progress.
+ */
+struct GNUNET_NAT_AutoHandle
+{
+
+  /**
+   * Configuration we use.
+   */
+  const struct GNUNET_CONFIGURATION_Handle *cfg;
+  
+  /**
+   * Message queue for communicating with the NAT service.
+   */
+  struct GNUNET_MQ_Handle *mq;
+
+  /**
+   * Function called with the result from the autoconfiguration.
+   */
+  GNUNET_NAT_AutoResultCallback arc;
+
+  /**
+   * Closure for @e arc.
+   */
+  void *arc_cls;
+
+};
+
+
+/**
+ * Converts `enum GNUNET_NAT_StatusCode` to string
+ *
+ * @param err error code to resolve to a string
+ * @return point to a static string containing the error code
+ */
+const char *
+GNUNET_NAT_status2string (enum GNUNET_NAT_StatusCode err)
+{
+  GNUNET_break (0);
+  return NULL;
+}
+
+
+/**
+ * Start auto-configuration routine.  The transport adapters should
+ * be stopped while this function is called.
+ *
+ * @param cfg initial configuration
+ * @param cb function to call with autoconfiguration result
+ * @param cb_cls closure for @a cb
+ * @return handle to cancel operation
+ */
+struct GNUNET_NAT_AutoHandle *
+GNUNET_NAT_autoconfig_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
+                             GNUNET_NAT_AutoResultCallback cb,
+                             void *cb_cls)
+{
+  struct GNUNET_NAT_AutoHandle *ah = GNUNET_new (struct GNUNET_NAT_AutoHandle);
+
+  ah->cfg = cfg;
+  ah->arc = cb;
+  ah->arc_cls = cb_cls;
+  GNUNET_break (0);
+  return ah;
+}
+
+
+/**
+ * Abort autoconfiguration.
+ *
+ * @param ah handle for operation to abort
+ */
+void
+GNUNET_NAT_autoconfig_cancel (struct GNUNET_NAT_AutoHandle *ah)
+{
+  GNUNET_break (0);
+  GNUNET_MQ_destroy (ah->mq);
+  GNUNET_free (ah);
+}
+
+/* end of nat_api.c */