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+

+# Tell versions [3.59,3.63) of GNU make to not export all variables.

+# Otherwise a system limit (for SysV at least) may be exceeded.

+.NOEXPORT:

+/*

+ This file is part of GNUnet.

+ (C) 2010, 2012 Christian Grothoff

+

+ 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.

+*/

+

+/**

+ * @file pt/gnunet-daemon-pt.c

+ * @brief tool to manipulate DNS and VPN services to perform protocol translation (IPvX over GNUnet)

+ * @author Christian Grothoff

+ */

+#include "platform.h"

+#include "gnunet_util_lib.h"

+#include "gnunet_dns_service.h"

+#include "gnunet_dnsparser_lib.h"

+#include "gnunet_mesh_service.h"

+#include "gnunet_tun_lib.h"

+#include "gnunet_vpn_service.h"

+#include "gnunet_statistics_service.h"

+#include "gnunet_applications.h"

+

+

+/**

+ * After how long do we time out if we could not get an IP from VPN or MESH?

+ */

+#define TIMEOUT GNUNET_TIME_UNIT_MINUTES

+

+

+/**

+ * How many bytes of payload do we allow at most for a DNS reply?

+ * Given that this is pretty much limited to loopback, we can be

+ * pretty high (Linux loopback defaults to 16k, most local UDP packets

+ * should survive up to 9k (NFS), so 8k should be pretty safe in

+ * general).

+ */

+#define MAX_DNS_SIZE (8 * 1024)

+

+

+/**

+ * Which group of DNS records are we currently processing?

+ */

+enum RequestGroup

+ {

+ /**

+ * DNS answers

+ */

+ ANSWERS = 0,

+

+ /**

+ * DNS authority records

+ */

+ AUTHORITY_RECORDS = 1,

+

+ /**

+ * DNS additional records

+ */

+ ADDITIONAL_RECORDS = 2,

+

+ /**

+ * We're done processing.

+ */

+ END = 3

+ };

+

+

+/**

+ * Information tracked per DNS reply that we are processing.

+ */

+struct ReplyContext

+{

+ /**

+ * Handle to submit the final result.

+ */

+ struct GNUNET_DNS_RequestHandle *rh;

+

+ /**

+ * DNS packet that is being modified.

+ */

+ struct GNUNET_DNSPARSER_Packet *dns;

+

+ /**

+ * Active redirection request with the VPN.

+ */

+ struct GNUNET_VPN_RedirectionRequest *rr;

+

+ /**

+ * Record for which we have an active redirection request.

+ */

+ struct GNUNET_DNSPARSER_Record *rec;

+

+ /**

+ * Offset in the current record group that is being modified.

+ */

+ unsigned int offset;

+

+ /**

+ * Group that is being modified

+ */

+ enum RequestGroup group;

+

+};

+

+

+/**

+ * State we keep for a request that is going out via MESH.

+ */

+struct RequestContext

+{

+ /**

+ * We keep these in a DLL.

+ */

+ struct RequestContext *next;

+

+ /**

+ * We keep these in a DLL.

+ */

+ struct RequestContext *prev;

+

+ /**

+ * Handle for interaction with DNS service.

+ */

+ struct GNUNET_DNS_RequestHandle *rh;

+

+ /**

+ * Message we're sending out via MESH, allocated at the

+ * end of this struct.

+ */

+ const struct GNUNET_MessageHeader *mesh_message;

+

+ /**

+ * Task used to abort this operation with timeout.

+ */

+ GNUNET_SCHEDULER_TaskIdentifier timeout_task;

+

+ /**

+ * ID of the original DNS request (used to match the reply).

+ */

+ uint16_t dns_id;

+

+ /**

+ * GNUNET_NO if this request is still in the transmit_queue,

+ * GNUNET_YES if we are in the receive_queue.

+ */

+ int16_t was_transmitted;

+

+};

+

+

+/**

+ * The handle to the configuration used throughout the process

+ */

+static const struct GNUNET_CONFIGURATION_Handle *cfg;

+

+/**

+ * The handle to the VPN

+ */

+static struct GNUNET_VPN_Handle *vpn_handle;

+

+/**

+ * The handle to the MESH service

+ */

+static struct GNUNET_MESH_Handle *mesh_handle;

+

+/**

+ * Tunnel we use for DNS requests over MESH.

+ */

+static struct GNUNET_MESH_Tunnel *mesh_tunnel;

+

+/**

+ * Active transmission request with MESH (or NULL).

+ */

+static struct GNUNET_MESH_TransmitHandle *mesh_th;

+

+/**

+ * Head of DLL of requests to be transmitted to mesh_tunnel.

+ */

+static struct RequestContext *transmit_queue_head;

+

+/**

+ * Tail of DLL of requests to be transmitted to mesh_tunnel.

+ */

+static struct RequestContext *transmit_queue_tail;

+

+/**

+ * Head of DLL of requests waiting for a response.

+ */

+static struct RequestContext *receive_queue_head;

+

+/**

+ * Tail of DLL of requests waiting for a response.

+ */

+static struct RequestContext *receive_queue_tail;

+

+/**

+ * Statistics.

+ */

+static struct GNUNET_STATISTICS_Handle *stats;

+

+/**

+ * The handle to DNS post-resolution modifications.

+ */

+static struct GNUNET_DNS_Handle *dns_post_handle;

+

+/**

+ * The handle to DNS pre-resolution modifications.

+ */

+static struct GNUNET_DNS_Handle *dns_pre_handle;

+

+/**

+ * Are we doing IPv4-pt?

+ */

+static int ipv4_pt;

+

+/**

+ * Are we doing IPv6-pt?

+ */

+static int ipv6_pt;

+

+/**

+ * Are we tunneling DNS queries?

+ */

+static int dns_tunnel;

+

+/**

+ * Number of DNS exit peers we currently have in the mesh tunnel.

+ * Used to see if using the mesh tunnel makes any sense right now.

+ */

+static unsigned int dns_exit_available;

+

+

+/**

+ * We're done modifying all records in the response. Submit the reply

+ * and free the resources of the rc.

+ *

+ * @param rc context to process

+ */

+static void

+finish_request (struct ReplyContext *rc)

+{

+ char *buf;

+ size_t buf_len;

+

+ if (GNUNET_SYSERR ==

+ GNUNET_DNSPARSER_pack (rc->dns,

+ MAX_DNS_SIZE,

+ &buf,

+ &buf_len))

+ {

+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,

+ _("Failed to pack DNS request. Dropping.\n"));

+ GNUNET_DNS_request_drop (rc->rh);

+ }

+ else

+ {

+ GNUNET_STATISTICS_update (stats,

+ gettext_noop ("# DNS requests mapped to VPN"),

+ 1, GNUNET_NO);

+ GNUNET_DNS_request_answer (rc->rh,

+ buf_len, buf);

+ GNUNET_free (buf);

+ }

+ GNUNET_DNSPARSER_free_packet (rc->dns);

+ GNUNET_free (rc);

+}

+

+

+/**

+ * Process the next record of the given request context.

+ * When done, submit the reply and free the resources of

+ * the rc.

+ *

+ * @param rc context to process

+ */

+static void

+submit_request (struct ReplyContext *rc);

+

+

+/**

+ * Callback invoked from the VPN service once a redirection is

+ * available. Provides the IP address that can now be used to

+ * reach the requested destination. We substitute the active

+ * record and then continue with 'submit_request' to look at

+ * the other records.

+ *

+ * @param cls our 'struct ReplyContext'

+ * @param af address family, AF_INET or AF_INET6; AF_UNSPEC on error;

+ * will match 'result_af' from the request

+ * @param address IP address (struct in_addr or struct in_addr6, depending on 'af')

+ * that the VPN allocated for the redirection;

+ * traffic to this IP will now be redirected to the

+ * specified target peer; NULL on error

+ */

+static void

+vpn_allocation_callback (void *cls,

+ int af,

+ const void *address)

+{

+ struct ReplyContext *rc = cls;

+

+ rc->rr = NULL;

+ if (af == AF_UNSPEC)

+ {

+ GNUNET_DNS_request_drop (rc->rh);

+ GNUNET_DNSPARSER_free_packet (rc->dns);

+ GNUNET_free (rc);

+ return;

+ }

+ GNUNET_STATISTICS_update (stats,

+ gettext_noop ("# DNS records modified"),

+ 1, GNUNET_NO);

+ switch (rc->rec->type)

+ {

+ case GNUNET_DNSPARSER_TYPE_A:

+ GNUNET_assert (AF_INET == af);

+ memcpy (rc->rec->data.raw.data, address, sizeof (struct in_addr));

+ break;

+ case GNUNET_DNSPARSER_TYPE_AAAA:

+ GNUNET_assert (AF_INET6 == af);

+ memcpy (rc->rec->data.raw.data, address, sizeof (struct in6_addr));

+ break;

+ default:

+ GNUNET_assert (0);

+ return;

+ }

+ rc->rec = NULL;

+ submit_request (rc);

+}

+

+

+/**

+ * Modify the given DNS record by asking VPN to create a tunnel

+ * to the given address. When done, continue with submitting

+ * other records from the request context ('submit_request' is

+ * our continuation).

+ *

+ * @param rc context to process

+ * @param rec record to modify

+ */

+static void

+modify_address (struct ReplyContext *rc,

+ struct GNUNET_DNSPARSER_Record *rec)

+{

+ int af;

+

+ switch (rec->type)

+ {

+ case GNUNET_DNSPARSER_TYPE_A:

+ af = AF_INET;

+ GNUNET_assert (rec->data.raw.data_len == sizeof (struct in_addr));

+ break;

+ case GNUNET_DNSPARSER_TYPE_AAAA:

+ af = AF_INET6;

+ GNUNET_assert (rec->data.raw.data_len == sizeof (struct in6_addr));

+ break;

+ default:

+ GNUNET_assert (0);

+ return;

+ }

+ rc->rec = rec;

+ rc->rr = GNUNET_VPN_redirect_to_ip (vpn_handle,

+ af, af,

+ rec->data.raw.data,

+ GNUNET_NO /* nac */,

+ GNUNET_TIME_relative_to_absolute (TIMEOUT),

+ &vpn_allocation_callback,

+ rc);

+}

+

+

+/**

+ * Process the next record of the given request context.

+ * When done, submit the reply and free the resources of

+ * the rc.

+ *

+ * @param rc context to process

+ */

+static void

+submit_request (struct ReplyContext *rc)

+{

+ struct GNUNET_DNSPARSER_Record *ra;

+ unsigned int ra_len;

+ unsigned int i;

+

+ while (1)

+ {

+ switch (rc->group)

+ {

+ case ANSWERS:

+ ra = rc->dns->