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/*
This file is part of GNUnet.
(C) 2010 Christian Grothoff (and other contributing authors)
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 2, 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file src/setup/gnunet-setup-transport.c
* @brief support for transport (NAT) configuration
* @author Christian Grothoff
*/
#include "gnunet-setup.h"
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_resolver_service.h>
#include <gnunet/gnunet_nat_lib.h>
/**
* How long do we wait for the NAT test to report success?
*/
#define TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
/**
* Handle to the active NAT test.
*/
static struct GNUNET_NAT_Test *tst;
/**
* Task identifier for the timeout.
*/
static GNUNET_SCHEDULER_TaskIdentifier tsk;
static struct GNUNET_OS_Process *resolver;
/**
* Update the ICMP server button based on the result.
*
* @param on GNUNET_YES to enable, GNUNET_NO to disable
*/
static void
update_icmp_server_enable_button (int on)
{
GtkToggleButton *button;
button =
GTK_TOGGLE_BUTTON (GNUNET_SETUP_get_object
("GNUNET_setup_transport_icmp_server_enable_checkbutton"));
if (button == NULL)
{
GNUNET_break (0);
return;
}
gtk_toggle_button_set_active (button, on ? TRUE : FALSE);
}
/**
* Function called by NAT on success.
* Clean up and update GUI (with success).
*
* @param cls closure (unused)
* @param success currently always GNUNET_OK
*/
static void
result_callback (void *cls, int success)
{
GNUNET_SCHEDULER_cancel (tsk);
tsk = GNUNET_SCHEDULER_NO_TASK;
GNUNET_NAT_test_stop (tst);
tst = NULL;
if (NULL != resolver)
{
GNUNET_break (0 == GNUNET_OS_process_kill (resolver, SIGTERM));
GNUNET_OS_process_close (resolver);
}
update_icmp_server_enable_button (success);
}
/**
* Function called if NAT failed to confirm success.
* Clean up and update GUI (with failure).
*
* @param cls closure (unused)
* @param tc scheduler callback
*/
static void
fail_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
GNUNET_assert (NULL != tst);
tsk = GNUNET_SCHEDULER_NO_TASK;
GNUNET_NAT_test_stop (tst);
tst = NULL;
update_icmp_server_enable_button (GNUNET_NO);
}
/**
* Main function for the connection reversal test.
*
* @param cls the 'int*' for the result
* @param tc scheduler context
*/
static void
reversal_test (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
int *ok = cls;
GNUNET_assert (NULL != cfg);
GNUNET_RESOLVER_connect (cfg);
tst = GNUNET_NAT_test_start (cfg, GNUNET_YES, 0, 0, &result_callback, ok);
if (NULL == tst)
{
*ok = GNUNET_SYSERR;
return;
}
tsk = GNUNET_SCHEDULER_add_delayed (TIMEOUT, &fail_timeout, ok);
}
/**
* Test if connection reversal (ICMP method) works.
*/
static void
test_connection_reversal ()
{
if (NULL != resolver)
return; /* test already active!? */
resolver =
GNUNET_OS_start_process (GNUNET_YES, NULL, NULL, "gnunet-service-resolver",
"gnunet-service-resolver", NULL);
GNUNET_SCHEDULER_add_now (&reversal_test, NULL);
}
/**
* Process list of local IP addresses. Find and set the
* one of the default interface.
*
* @param cls closure (not used)
* @param name name of the interface (can be NULL for unknown)
* @param isDefault is this presumably the default interface
* @param addr address of this interface (can be NULL for unknown or unassigned)
* @param broadcast_addr the broadcast address (can be NULL for unknown or unassigned)
* @param netmask the network mask (can be NULL for unknown or unassigned))
* @param addrlen length of the address
* @return GNUNET_OK to continue iteration, GNUNET_SYSERR to abort
*/
static int
nipo (void *cls, const char *name, int isDefault, const struct sockaddr *addr,
const struct sockaddr *broadcast_addr, const struct sockaddr *netmask,
socklen_t addrlen)
{
const struct sockaddr_in *in;
char buf[INET_ADDRSTRLEN];
GtkEntry *entry;
if (!isDefault)
return GNUNET_OK;
if (addrlen != sizeof (struct sockaddr_in))
return GNUNET_OK;
in = (const struct sockaddr_in *) addr;
/* set internal IP address */
if (NULL == inet_ntop (AF_INET, &in->sin_addr, buf, sizeof (buf)))
{
GNUNET_break (0);
return GNUNET_OK;
}
GNUNET_CONFIGURATION_set_value_string (cfg, "nat", "INTERNAL_ADDRESS", buf);
entry =
GTK_ENTRY (GNUNET_SETUP_get_object
("GNUNET_setup_transport_internal_ip_entry"));
if (entry == NULL)
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
gtk_entry_set_text (entry, buf);
/* no need to continue iteration */
return GNUNET_SYSERR;
}
/**
* Set our external IPv4 address.
*
* @param cls closure
* @param addr the address, NULL on errors
*/
static void
set_external_ipv4 (void *cls, const struct in_addr *addr)
{
char buf[INET_ADDRSTRLEN];
GObject *o;
GtkEntry *entry;
GtkToggleButton *button;
if (NULL != addr)
{
/* enable 'behind nat' */
if (NULL != cfg)
GNUNET_CONFIGURATION_set_value_string (cfg, "nat", "BEHIND_NAT", "YES");
o = GNUNET_SETUP_get_object ("GNUNET_setup_transport_nat_checkbutton");
if (NULL != o)
{
button = GTK_TOGGLE_BUTTON (o);
if (button == NULL)
{
GNUNET_break (0);
return;
}
gtk_toggle_button_set_active (button, TRUE);
}
/* set external IP address */
if (NULL == inet_ntop (AF_INET, addr, buf, sizeof (buf)))
{
GNUNET_break (0);
return;
}
if (NULL != cfg)
GNUNET_CONFIGURATION_set_value_string (cfg, "nat", "EXTERNAL_ADDRESS",
buf);
o = GNUNET_SETUP_get_object
("GNUNET_setup_transport_external_ip_address_entry");
if (NULL != o)
{
entry = GTK_ENTRY (o);
if (entry == NULL)
{
GNUNET_break (0);
return;
}
gtk_entry_set_text (entry, buf);
}
}
}
/**
* User asked for autoconfiguration. Try the full program.
*/
void
GNUNET_setup_transport_autoconfig_button_clicked_cb ()
{
GtkToggleButton *button;
int hns;
int hnc;
char *tmp;
/* try to detect external IP */
(void) GNUNET_NAT_mini_get_external_ipv4 (TIMEOUT, &set_external_ipv4, NULL);
/* Try to detect internal IP */
GNUNET_OS_network_interfaces_list (&nipo, NULL);
/* FIXME: do more: test if UPnP works */
/* test gnunet-helper-nat-server */
tmp = NULL;
hns =
((GNUNET_OK ==
GNUNET_CONFIGURATION_get_value_string (cfg, "nat", "EXTERNAL_ADDRESS",
&tmp)) && (0 < strlen (tmp)) &&
(GNUNET_YES ==
GNUNET_CONFIGURATION_get_value_yesno (cfg, "nat", "BEHIND_NAT")) &&
(GNUNET_YES ==
GNUNET_OS_check_helper_binary ("gnunet-helper-nat-server")));
GNUNET_free_non_null (tmp);
if (hns)
test_connection_reversal ();
/* test gnunet-helper-nat-client */
tmp = NULL;
hnc =
((GNUNET_OK ==
GNUNET_CONFIGURATION_get_value_string (cfg, "nat", "INTERNAL_ADDRESS",
&tmp)) && (0 < strlen (tmp)) &&
(GNUNET_YES !=
GNUNET_CONFIGURATION_get_value_yesno (cfg, "nat", "BEHIND_NAT")) &&
(GNUNET_YES ==
GNUNET_OS_check_helper_binary ("gnunet-helper-nat-client")));
GNUNET_free_non_null (tmp);
button =
GTK_TOGGLE_BUTTON (GNUNET_SETUP_get_object
("GNUNET_setup_transport_icmp_client_enable_checkbutton"));
if (button == NULL)
{
GNUNET_break (0);
return;
}
gtk_toggle_button_set_active (button, hnc ? TRUE : FALSE);
}
/* end of gnunet-setup-transport.c */
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