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/*
This file is part of GNUnet.
(C) 2009, 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 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include "platform.h"
#include "gnunet_client_lib.h"
#include "gnunet_arm_service.h"
#include "gnunet_hello_lib.h"
#include "gnunet_protocols.h"
#include "gnunet_server_lib.h"
#include "gnunet_time_lib.h"
#include "gnunet_transport_service.h"
#include "transport.h"
/**
* Context for the address lookup.
*/
struct GNUNET_TRANSPORT_AddressToStringContext
{
/**
* Function to call with the human-readable address.
*/
GNUNET_TRANSPORT_AddressToStringCallback cb;
/**
* Closure for cb.
*/
void *cb_cls;
/**
* Connection to the service.
*/
struct GNUNET_CLIENT_Connection *client;
/**
* When should this operation time out?
*/
struct GNUNET_TIME_Absolute timeout;
};
/**
* Function called with responses from the service.
*
* @param cls our 'struct GNUNET_TRANSPORT_AddressLookupContext*'
* @param msg NULL on timeout or error, otherwise presumably a
* message with the human-readable address
*/
static void
address_response_processor (void *cls, const struct GNUNET_MessageHeader *msg)
{
struct GNUNET_TRANSPORT_AddressToStringContext *alucb = cls;
const char *address;
uint16_t size;
if (msg == NULL)
{
alucb->cb (alucb->cb_cls, NULL);
GNUNET_CLIENT_disconnect (alucb->client);
GNUNET_free (alucb);
return;
}
GNUNET_break (ntohs (msg->type) ==
GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
size = ntohs (msg->size);
if (size == sizeof (struct GNUNET_MessageHeader))
{
/* done! */
alucb->cb (alucb->cb_cls, NULL);
GNUNET_CLIENT_disconnect (alucb->client);
GNUNET_free (alucb);
return;
}
address = (const char *) &msg[1];
if (address[size - sizeof (struct GNUNET_MessageHeader) - 1] != '\0')
{
/* invalid reply */
GNUNET_break (0);
alucb->cb (alucb->cb_cls, NULL);
GNUNET_CLIENT_disconnect (alucb->client);
GNUNET_free (alucb);
return;
}
/* expect more replies */
GNUNET_CLIENT_receive (alucb->client, &address_response_processor, alucb,
GNUNET_TIME_absolute_get_remaining (alucb->timeout));
alucb->cb (alucb->cb_cls, address);
}
/**
* Convert a binary address into a human readable address.
*
* @param cfg configuration to use
* @param address address to convert (binary format)
* @param numeric should (IP) addresses be displayed in numeric form
* (otherwise do reverse DNS lookup)
* @param timeout how long is the lookup allowed to take at most
* @param aluc function to call with the results
* @param aluc_cls closure for aluc
* @return handle to cancel the operation, NULL on error
*/
struct GNUNET_TRANSPORT_AddressToStringContext *
GNUNET_TRANSPORT_address_to_string (const struct GNUNET_CONFIGURATION_Handle
*cfg,
const struct GNUNET_HELLO_Address *address,
int numeric,
struct GNUNET_TIME_Relative timeout,
GNUNET_TRANSPORT_AddressToStringCallback
aluc, void *aluc_cls)
{
size_t len;
size_t alen;
size_t slen;
struct AddressLookupMessage *msg;
struct GNUNET_TRANSPORT_AddressToStringContext *alc;
struct GNUNET_CLIENT_Connection *client;
char *addrbuf;
GNUNET_assert (address != NULL);
alen = address->address_length;
slen = strlen (address->transport_name) + 1;
len = sizeof (struct AddressLookupMessage) + alen + slen;
if (len >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
{
GNUNET_break (0);
return NULL;
}
client = GNUNET_CLIENT_connect ("transport", cfg);
if (NULL == client)
return NULL;
msg = GNUNET_malloc (len);
msg->header.size = htons (len);
msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING);
msg->numeric_only = htons ((int16_t) numeric);
msg->addrlen = htons ((uint16_t) alen);
msg->timeout = GNUNET_TIME_relative_hton (timeout);
addrbuf = (char *) &msg[1];
memcpy (addrbuf, address->address, alen);
memcpy (&addrbuf[alen], address->transport_name, slen);
alc = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_AddressToStringContext));
alc->cb = aluc;
alc->cb_cls = aluc_cls;
alc->timeout = GNUNET_TIME_relative_to_absolute (timeout);
alc->client = client;
GNUNET_assert (GNUNET_OK ==
GNUNET_CLIENT_transmit_and_get_response (client, &msg->header,
timeout, GNUNET_YES,
&address_response_processor,
alc));
GNUNET_free (msg);
return alc;
}
/**
* Cancel request for address conversion.
*
* @param alc handle for the request to cancel
*/
void
GNUNET_TRANSPORT_address_to_string_cancel (struct
GNUNET_TRANSPORT_AddressToStringContext
*alc)
{
GNUNET_CLIENT_disconnect (alc->client);
GNUNET_free (alc);
}
/* end of transport_api_address_to_string.c */
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