/*
This file is part of GNUnet.
- (C) 2010, 2012 Christian Grothoff
+ Copyright (C) 2010, 2012, 2017 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 free software: you can redistribute it and/or modify it
+ under the terms of the GNU Affero General Public License as published
+ by the Free Software Foundation, either version 3 of the License,
+ 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.
+ Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
- 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.
+ SPDX-License-Identifier: AGPL3.0-or-later
*/
-
/**
* @file pt/gnunet-daemon-pt.c
* @brief tool to manipulate DNS and VPN services to perform protocol translation (IPvX over GNUnet)
#include "gnunet_util_lib.h"
#include "gnunet_dns_service.h"
#include "gnunet_dnsparser_lib.h"
-#include "gnunet_mesh_service.h"
+#include "gnunet_cadet_service.h"
#include "gnunet_tun_lib.h"
#include "gnunet_dht_service.h"
#include "gnunet_vpn_service.h"
/**
- * After how long do we time out if we could not get an IP from VPN or MESH?
+ * After how long do we time out if we could not get an IP from VPN or CADET?
*/
#define TIMEOUT GNUNET_TIME_UNIT_MINUTES
#define MAX_DNS_SIZE (8 * 1024)
/**
- * How many tunnels do we open at most at the same time?
+ * How many channels do we open at most at the same time?
*/
#define MAX_OPEN_TUNNELS 4
/**
* DNS answers
*/
- ANSWERS = 0,
+ ANSWERS = 0,
/**
* DNS authority records
* Handle to submit the final result.
*/
struct GNUNET_DNS_RequestHandle *rh;
-
+
/**
* DNS packet that is being modified.
*/
* Group that is being modified
*/
enum RequestGroup group;
-
+
};
/**
* Handle to a peer that advertised that it is willing to serve
- * as a DNS exit. We try to keep a few tunnels open and a few
+ * as a DNS exit. We try to keep a few channels open and a few
* peers in reserve.
*/
-struct MeshExit
+struct CadetExit
{
/**
* Kept in a DLL.
*/
- struct MeshExit *next;
+ struct CadetExit *next;
/**
* Kept in a DLL.
*/
- struct MeshExit *prev;
+ struct CadetExit *prev;
/**
- * Tunnel we use for DNS requests over MESH, NULL if we did
- * not initialze a tunnel to this peer yet.
+ * Channel we use for DNS requests over CADET, NULL if we did
+ * not initialze a channel to this peer yet.
*/
- struct GNUNET_MESH_Tunnel *mesh_tunnel;
-
+ struct GNUNET_CADET_Channel *cadet_channel;
+
/**
* At what time did the peer's advertisement expire?
*/
*/
struct RequestContext *receive_queue_tail;
- /**
- * Head of DLL of requests to be transmitted to a mesh_tunnel.
- */
- struct RequestContext *transmit_queue_head;
-
- /**
- * Tail of DLL of requests to be transmitted to a mesh_tunnel.
- */
- struct RequestContext *transmit_queue_tail;
-
- /**
- * Active transmission request for this tunnel (or NULL).
- */
- struct GNUNET_MESH_TransmitHandle *mesh_th;
-
/**
* Identity of the peer that is providing the exit for us.
- */
+ */
struct GNUNET_PeerIdentity peer;
/**
- * How many DNS requests did we transmit via this tunnel?
+ * How many DNS requests did we transmit via this channel?
*/
unsigned int num_transmitted;
/**
- * How many DNS requests were answered via this tunnel?
+ * How many DNS requests were answered via this channel?
*/
unsigned int num_answered;
+ /**
+ * Size of the window, 0 if we are busy.
+ */
+ /* unsigned */ int idle;
+
};
/**
- * State we keep for a request that is going out via MESH.
+ * State we keep for a request that is going out via CADET.
*/
struct RequestContext
{
/**
* Exit that was chosen for this request.
*/
- struct MeshExit *exit;
+ struct CadetExit *exit;
/**
* 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.
+ * Envelope with the request we are transmitting.
*/
- const struct GNUNET_MessageHeader *mesh_message;
+ struct GNUNET_MQ_Envelope *env;
/**
* Task used to abort this operation with timeout.
*/
- GNUNET_SCHEDULER_TaskIdentifier timeout_task;
+ struct GNUNET_SCHEDULER_Task *timeout_task;
/**
* Length of the request message that follows this struct.
*/
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;
-
};
/**
- * Head of DLL of mesh exits. Mesh exits with an open tunnel are
+ * Head of DLL of cadet exits. Cadet exits with an open channel are
* always at the beginning (so we do not have to traverse the entire
* list to find them).
*/
-static struct MeshExit *exit_head;
+static struct CadetExit *exit_head;
/**
- * Tail of DLL of mesh exits.
+ * Tail of DLL of cadet exits.
*/
-static struct MeshExit *exit_tail;
+static struct CadetExit *exit_tail;
/**
* The handle to the configuration used throughout the process
static struct GNUNET_VPN_Handle *vpn_handle;
/**
- * The handle to the MESH service
+ * The handle to the CADET service
*/
-static struct GNUNET_MESH_Handle *mesh_handle;
+static struct GNUNET_CADET_Handle *cadet_handle;
/**
* Statistics.
static int ipv6_pt;
/**
- * Are we tunneling DNS queries?
+ * Are we channeling DNS queries?
*/
-static int dns_tunnel;
+static int dns_channel;
/**
- * 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,
- * as well as to decide if we should open new tunnels.
+ * Number of DNS exit peers we currently have in the cadet channel.
+ * Used to see if using the cadet channel makes any sense right now,
+ * as well as to decide if we should open new channels.
*/
static unsigned int dns_exit_available;
/**
- * We are short on mesh exits, try to open another one.
+ * We are short on cadet exits, try to open another one.
*/
static void
-try_open_exit ()
-{
- struct MeshExit *pos;
- uint32_t candidate_count;
- uint32_t candidate_selected;
-
- candidate_count = 0;
- for (pos = exit_head; NULL != pos; pos = pos->next)
- if (NULL == pos->mesh_tunnel)
- candidate_count++;
- candidate_selected = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
- candidate_count);
- candidate_count = 0;
- for (pos = exit_head; NULL != pos; pos = pos->next)
- if (NULL == pos->mesh_tunnel)
- {
- candidate_count++;
- if (candidate_selected < candidate_count)
- {
- /* move to the head of the DLL */
- pos->mesh_tunnel = GNUNET_MESH_tunnel_create (mesh_handle,
- pos,
- &pos->peer,
- GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
- GNUNET_YES /* no buffer */,
- GNUNET_NO /* reliable */);
- if (NULL == pos->mesh_tunnel)
- {
- GNUNET_break (0);
- continue;
- }
- GNUNET_CONTAINER_DLL_remove (exit_head,
- exit_tail,
- pos);
- GNUNET_CONTAINER_DLL_insert (exit_head,
- exit_tail,
- pos);
- dns_exit_available++;
- return;
- }
- }
- GNUNET_assert (NULL == exit_head);
-}
+try_open_exit (void);
/**
* Compute the weight of the given exit. The higher the weight,
- * the more likely it will be that the tunnel will be chosen.
- * A weigt of zero means that we should close the tunnel as it
+ * the more likely it will be that the channel will be chosen.
+ * A weigt of zero means that we should close the channel as it
* is so bad, that we should not use it.
*
* @param exit exit to calculate the weight for
- * @return weight of the tunnel
+ * @return weight of the channel
*/
static uint32_t
-get_tunnel_weight (struct MeshExit *exit)
+get_channel_weight (struct CadetExit *exit)
{
uint32_t dropped;
uint32_t drop_percent;
uint32_t good_percent;
-
+
GNUNET_assert (exit->num_transmitted >= exit->num_answered);
dropped = exit->num_transmitted - exit->num_answered;
if (exit->num_transmitted > 0)
/**
- * Choose a mesh exit for a DNS request. We try to use a tunnel
- * that is reliable and currently available. All existing
- * tunnels are given a base weight of 1, plus a score relating
+ * Choose a cadet exit for a DNS request. We try to use a channel
+ * that is reliable and currently available. All existing
+ * channels are given a base weight of 1, plus a score relating
* to the total number of queries answered in relation to the
- * total number of queries we sent to that tunnel. That
- * score is doubled if the tunnel is currently idle.
+ * total number of queries we sent to that channel. That
+ * score is doubled if the channel is currently idle.
*
* @return NULL if no exit is known, otherwise the
* exit that we should use to queue a message with
*/
-static struct MeshExit *
+static struct CadetExit *
choose_exit ()
{
- struct MeshExit *pos;
+ struct CadetExit *pos;
uint64_t total_transmitted;
uint64_t selected_offset;
- uint32_t tunnel_weight;
+ uint32_t channel_weight;
total_transmitted = 0;
for (pos = exit_head; NULL != pos; pos = pos->next)
{
- if (NULL == pos->mesh_tunnel)
+ if (NULL == pos->cadet_channel)
break;
- tunnel_weight = get_tunnel_weight (pos);
- total_transmitted += tunnel_weight;
- /* double weight for idle tunnels */
- if (NULL == pos->mesh_th)
- total_transmitted += tunnel_weight;
+ channel_weight = get_channel_weight (pos);
+ total_transmitted += channel_weight;
+ /* double weight for idle channels */
+ if (0 != pos->idle)
+ total_transmitted += channel_weight;
}
if (0 == total_transmitted)
{
- /* no tunnels available, or only a very bad one... */
+ /* no channels available, or only a very bad one... */
return exit_head;
}
selected_offset = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
total_transmitted = 0;
for (pos = exit_head; NULL != pos; pos = pos->next)
{
- if (NULL == pos->mesh_tunnel)
+ if (NULL == pos->cadet_channel)
break;
- tunnel_weight = get_tunnel_weight (pos);
- total_transmitted += tunnel_weight;
- /* double weight for idle tunnels */
- if (NULL == pos->mesh_th)
- total_transmitted += tunnel_weight;
+ channel_weight = get_channel_weight (pos);
+ total_transmitted += channel_weight;
+ /* double weight for idle channels */
+ if (0 != pos->idle)
+ total_transmitted += channel_weight;
if (total_transmitted > selected_offset)
return pos;
}
gettext_noop ("# DNS requests mapped to VPN"),
1, GNUNET_NO);
GNUNET_DNS_request_answer (rc->rh,
- buf_len, buf);
+ buf_len,
+ buf);
GNUNET_free (buf);
}
GNUNET_DNSPARSER_free_packet (rc->dns);
* 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
+ * traffic to this IP will now be redirected to the
* specified target peer; NULL on error
*/
static void
}
GNUNET_STATISTICS_update (stats,
gettext_noop ("# DNS records modified"),
- 1, GNUNET_NO);
+ 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));
+ GNUNET_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));
+ GNUNET_memcpy (rc->rec->data.raw.data,
+ address,
+ sizeof (struct in6_addr));
break;
default:
GNUNET_assert (0);
/**
- * Modify the given DNS record by asking VPN to create a tunnel
+ * Modify the given DNS record by asking VPN to create a channel
* to the given address. When done, continue with submitting
* other records from the request context ('submit_request' is
* our continuation).
}
rc->rec = rec;
rc->rr = GNUNET_VPN_redirect_to_ip (vpn_handle,
- af, af,
+ af,
+ af,
rec->data.raw.data,
GNUNET_TIME_relative_to_absolute (TIMEOUT),
&vpn_allocation_callback,
finish_request (rc);
return;
default:
- GNUNET_assert (0);
+ GNUNET_assert (0);
}
for (i=rc->offset;i<ra_len;i++)
{
if (ipv4_pt)
{
rc->offset = i + 1;
- modify_address (rc, &ra[i]);
+ modify_address (rc,
+ &ra[i]);
return;
}
break;
if (ipv6_pt)
{
rc->offset = i + 1;
- modify_address (rc, &ra[i]);
+ modify_address (rc,
+ &ra[i]);
return;
}
break;
/**
- * This function is called AFTER we got an IP address for a
+ * This function is called AFTER we got an IP address for a
* DNS request. Now, the PT daemon has the chance to substitute
- * the IP address with one from the VPN range to tunnel requests
- * destined for this IP address via VPN and MESH.
+ * the IP address with one from the VPN range to channel requests
+ * destined for this IP address via VPN and CADET.
*
* @param cls closure
* @param rh request handle to user for reply
* @param request_length number of bytes in request
* @param request udp payload of the DNS request
*/
-static void
+static void
dns_post_request_handler (void *cls,
struct GNUNET_DNS_RequestHandle *rh,
size_t request_length,
GNUNET_STATISTICS_update (stats,
gettext_noop ("# DNS replies intercepted"),
1, GNUNET_NO);
- dns = GNUNET_DNSPARSER_parse (request, request_length);
+ dns = GNUNET_DNSPARSER_parse (request,
+ request_length);
if (NULL == dns)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
return;
}
work = GNUNET_NO;
- work |= work_test (dns->answers, dns->num_answers);
- work |= work_test (dns->authority_records, dns->num_authority_records);
- work |= work_test (dns->additional_records, dns->num_additional_records);
+ work |= work_test (dns->answers,
+ dns->num_answers);
+ work |= work_test (dns->authority_records,
+ dns->num_authority_records);
+ work |= work_test (dns->additional_records,
+ dns->num_additional_records);
if (! work)
{
GNUNET_DNS_request_forward (rh);
/**
- * Transmit a DNS request via MESH and move the request
- * handle to the receive queue.
- *
- * @param cls the `struct MeshExit`
- * @param size number of bytes available in buf
- * @param buf where to copy the message
- * @return number of bytes written to buf
- */
-static size_t
-transmit_dns_request_to_mesh (void *cls,
- size_t size,
- void *buf)
-{
- struct MeshExit *exit = cls;
- struct RequestContext *rc;
- size_t mlen;
-
- exit->mesh_th = NULL;
- if (NULL == (rc = exit->transmit_queue_head))
- return 0;
- mlen = rc->mlen;
- if (mlen > size)
- {
- exit->mesh_th = GNUNET_MESH_notify_transmit_ready (exit->mesh_tunnel,
- GNUNET_NO,
- TIMEOUT,
- mlen,
- &transmit_dns_request_to_mesh,
- exit);
- return 0;
- }
- GNUNET_assert (GNUNET_NO == rc->was_transmitted);
- memcpy (buf, rc->mesh_message, mlen);
- GNUNET_CONTAINER_DLL_remove (exit->transmit_queue_head,
- exit->transmit_queue_tail,
- rc);
- rc->was_transmitted = GNUNET_YES;
- GNUNET_CONTAINER_DLL_insert (exit->receive_queue_head,
- exit->receive_queue_tail,
- rc);
- rc = exit->transmit_queue_head;
- if (NULL != rc)
- exit->mesh_th = GNUNET_MESH_notify_transmit_ready (exit->mesh_tunnel,
- GNUNET_NO,
- TIMEOUT,
- rc->mlen,
- &transmit_dns_request_to_mesh,
- exit);
- return mlen;
-}
-
-
-/**
- * Task run if the time to answer a DNS request via MESH is over.
+ * Task run if the time to answer a DNS request via CADET is over.
*
* @param cls the `struct RequestContext` to abort
- * @param tc scheduler context
*/
static void
-timeout_request (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+timeout_request (void *cls)
{
struct RequestContext *rc = cls;
- struct MeshExit *exit = rc->exit;
-
- if (rc->was_transmitted)
- {
- exit->num_transmitted++;
- GNUNET_CONTAINER_DLL_remove (exit->receive_queue_head,
- exit->receive_queue_tail,
- rc);
- }
- else
- {
- GNUNET_CONTAINER_DLL_remove (exit->transmit_queue_head,
- exit->transmit_queue_tail,
- rc);
- }
+ struct CadetExit *exit = rc->exit;
+
GNUNET_STATISTICS_update (stats,
gettext_noop ("# DNS requests dropped (timeout)"),
- 1, GNUNET_NO);
+ 1,
+ GNUNET_NO);
GNUNET_DNS_request_drop (rc->rh);
GNUNET_free (rc);
- if ( (0 == get_tunnel_weight (exit)) &&
- (NULL == exit->receive_queue_head) &&
- (NULL == exit->transmit_queue_head) )
+ if ( (0 == get_channel_weight (exit)) &&
+ (NULL == exit->receive_queue_head) )
{
- /* this straw broke the camel's back: this tunnel now has
+ /* this straw broke the camel's back: this channel now has
such a low score that it will not be used; close it! */
- GNUNET_assert (NULL == exit->mesh_th);
- GNUNET_MESH_tunnel_destroy (exit->mesh_tunnel);
- exit->mesh_tunnel = NULL;
+ GNUNET_CADET_channel_destroy (exit->cadet_channel);
+ exit->cadet_channel = NULL;
GNUNET_CONTAINER_DLL_remove (exit_head,
exit_tail,
exit);
exit_tail,
exit);
/* go back to semi-innocent: mark as not great, but
- avoid a prohibitively negative score (see
- #get_tunnel_weight, which checks for a certain
+ avoid a prohibitively negative score (see
+ #get_channel_weight(), which checks for a certain
minimum number of transmissions before making
up an opinion) */
exit->num_transmitted = 5;
/**
- * This function is called *before* the DNS request has been
- * given to a "local" DNS resolver. Tunneling for DNS requests
- * was enabled, so we now need to send the request via some MESH
- * tunnel to a DNS EXIT for resolution.
+ * This function is called *before* the DNS request has been
+ * given to a "local" DNS resolver. Channeling for DNS requests
+ * was enabled, so we now need to send the request via some CADET
+ * channel to a DNS EXIT for resolution.
*
* @param cls closure
* @param rh request handle to user for reply
* @param request_length number of bytes in request
* @param request udp payload of the DNS request
*/
-static void
+static void
dns_pre_request_handler (void *cls,
struct GNUNET_DNS_RequestHandle *rh,
size_t request_length,
const char *request)
{
struct RequestContext *rc;
- size_t mlen;
- struct GNUNET_MessageHeader hdr;
+ struct GNUNET_MQ_Envelope *env;
+ struct GNUNET_MessageHeader *hdr;
struct GNUNET_TUN_DnsHeader dns;
- struct MeshExit *exit;
+ struct CadetExit *exit;
GNUNET_STATISTICS_update (stats,
gettext_noop ("# DNS requests intercepted"),
if (0 == dns_exit_available)
{
GNUNET_STATISTICS_update (stats,
- gettext_noop ("# DNS requests dropped (DNS mesh tunnel down)"),
+ gettext_noop ("# DNS requests dropped (DNS cadet channel down)"),
1, GNUNET_NO);
GNUNET_DNS_request_drop (rh);
return;
GNUNET_DNS_request_drop (rh);
return;
}
- memcpy (&dns, request, sizeof (dns));
- mlen = sizeof (struct GNUNET_MessageHeader) + request_length;
exit = choose_exit ();
GNUNET_assert (NULL != exit);
- GNUNET_assert (NULL != exit->mesh_tunnel);
- rc = GNUNET_malloc (sizeof (struct RequestContext) + mlen);
+ GNUNET_assert (NULL != exit->cadet_channel);
+
+ env = GNUNET_MQ_msg_extra (hdr,
+ request_length,
+ GNUNET_MESSAGE_TYPE_VPN_DNS_TO_INTERNET);
+ GNUNET_memcpy (&hdr[1],
+ request,
+ request_length);
+ rc = GNUNET_new (struct RequestContext);
rc->exit = exit;
rc->rh = rh;
- rc->mesh_message = (const struct GNUNET_MessageHeader*) &rc[1];
rc->timeout_task = GNUNET_SCHEDULER_add_delayed (TIMEOUT,
&timeout_request,
rc);
+ GNUNET_memcpy (&dns,
+ request,
+ sizeof (dns));
rc->dns_id = dns.id;
- rc->mlen = mlen;
- hdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_DNS_TO_INTERNET);
- hdr.size = htons (mlen);
- memcpy (&rc[1], &hdr, sizeof (struct GNUNET_MessageHeader));
- memcpy (&(((char*)&rc[1])[sizeof (struct GNUNET_MessageHeader)]),
- request,
- request_length);
- GNUNET_CONTAINER_DLL_insert_tail (exit->transmit_queue_head,
- exit->transmit_queue_tail,
- rc);
- if (NULL == exit->mesh_th)
- exit->mesh_th = GNUNET_MESH_notify_transmit_ready (exit->mesh_tunnel,
- GNUNET_NO,
- TIMEOUT,
- mlen,
- &transmit_dns_request_to_mesh,
- exit);
+ rc->env = env;
+ GNUNET_CONTAINER_DLL_remove (exit->receive_queue_head,
+ exit->receive_queue_tail,
+ rc);
+ if (0 < exit->idle)
+ exit->idle--;
+ exit->num_transmitted++;
+ GNUNET_MQ_send (GNUNET_CADET_get_mq (exit->cadet_channel),
+ GNUNET_MQ_env_copy (env));
}
+GNUNET_NETWORK_STRUCT_BEGIN
+
/**
- * Process a request via mesh to perform a DNS query.
+ * Message with a DNS response.
+ */
+struct DnsResponseMessage
+{
+ /**
+ * GNUnet header, of type #GNUNET_MESSAGE_TYPE_VPN_DNS_FROM_INTERNET
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * DNS header.
+ */
+ struct GNUNET_TUN_DnsHeader dns;
+
+ /* Followed by more DNS payload */
+};
+
+GNUNET_NETWORK_STRUCT_END
+
+/**
+ * Process a request via cadet to perform a DNS query.
*
- * @param cls NULL
- * @param tunnel connection to the other end
- * @param tunnel_ctx pointer to our `struct MeshExit`
- * @param message the actual message
+ * @param cls the `struct CadetExit` which got the message
+ * @param msg the actual message
* @return #GNUNET_OK to keep the connection open,
* #GNUNET_SYSERR to close it (signal serious error)
*/
static int
-receive_dns_response (void *cls,
- struct GNUNET_MESH_Tunnel *tunnel,
- void **tunnel_ctx,
- const struct GNUNET_MessageHeader *message)
+check_dns_response (void *cls,
+ const struct DnsResponseMessage *msg)
{
- struct MeshExit *exit = *tunnel_ctx;
- struct GNUNET_TUN_DnsHeader dns;
+ return GNUNET_OK; /* all OK */
+}
+
+
+/**
+ * Process a request via cadet to perform a DNS query.
+ *
+ * @param cls the `struct CadetExit` which got the message
+ * @param msg the actual message
+ */
+static void
+handle_dns_response (void *cls,
+ const struct DnsResponseMessage *msg)
+{
+ struct CadetExit *exit = cls;
size_t mlen;
struct RequestContext *rc;
- mlen = ntohs (message->size);
- mlen -= sizeof (struct GNUNET_MessageHeader);
- if (mlen < sizeof (struct GNUNET_TUN_DnsHeader))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- memcpy (&dns, &message[1], sizeof (dns));
+ mlen = ntohs (msg->header.size) - sizeof (*msg);
for (rc = exit->receive_queue_head; NULL != rc; rc = rc->next)
{
- GNUNET_assert (GNUNET_YES == rc->was_transmitted);
- if (dns.id == rc->dns_id)
+ if (msg->dns.id == rc->dns_id)
{
GNUNET_STATISTICS_update (stats,
gettext_noop ("# DNS replies received"),
- 1, GNUNET_NO);
+ 1,
+ GNUNET_NO);
GNUNET_DNS_request_answer (rc->rh,
- mlen,
- (const void*) &message[1]);
+ mlen + sizeof (struct GNUNET_TUN_DnsHeader),
+ (const void*) &msg->dns);
GNUNET_CONTAINER_DLL_remove (exit->receive_queue_head,
exit->receive_queue_tail,
rc);
GNUNET_SCHEDULER_cancel (rc->timeout_task);
+ GNUNET_MQ_discard (rc->env);
GNUNET_free (rc);
exit->num_answered++;
- exit->num_transmitted++;
- return GNUNET_OK;
+ return;
}
}
GNUNET_STATISTICS_update (stats,
gettext_noop ("# DNS replies dropped (too late?)"),
1, GNUNET_NO);
- return GNUNET_OK;
}
/**
- * Abort all pending DNS requests with the given mesh exit.
+ * Abort all pending DNS requests with the given cadet exit.
*
- * @param exit mesh exit to abort requests for
- */
+ * @param exit cadet exit to abort requests for
+ */
static void
-abort_all_requests (struct MeshExit *exit)
+abort_all_requests (struct CadetExit *exit)
{
struct RequestContext *rc;
rc);
GNUNET_DNS_request_drop (rc->rh);
GNUNET_SCHEDULER_cancel (rc->timeout_task);
- GNUNET_free (rc);
- }
- while (NULL != (rc = exit->transmit_queue_head))
- {
- GNUNET_CONTAINER_DLL_remove (exit->transmit_queue_head,
- exit->transmit_queue_tail,
- rc);
- GNUNET_DNS_request_drop (rc->rh);
- GNUNET_SCHEDULER_cancel (rc->timeout_task);
- GNUNET_free (rc);
+ GNUNET_MQ_discard (rc->env);
+ GNUNET_free (rc);
}
}
* Function scheduled as very last function, cleans up after us
*
* @param cls closure, NULL
- * @param tskctx scheduler context, unused
*/
static void
-cleanup (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tskctx)
+cleanup (void *cls)
{
- struct MeshExit *exit;
+ struct CadetExit *exit;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Protocol translation daemon is shutting down now\n");
GNUNET_CONTAINER_DLL_remove (exit_head,
exit_tail,
exit);
- if (NULL != exit->mesh_th)
+ if (NULL != exit->cadet_channel)
{
- GNUNET_MESH_notify_transmit_ready_cancel (exit->mesh_th);
- exit->mesh_th = NULL;
- }
- if (NULL != exit->mesh_tunnel)
- {
- GNUNET_MESH_tunnel_destroy (exit->mesh_tunnel);
- exit->mesh_tunnel = NULL;
+ GNUNET_CADET_channel_destroy (exit->cadet_channel);
+ exit->cadet_channel = NULL;
}
abort_all_requests (exit);
GNUNET_free (exit);
}
- if (NULL != mesh_handle)
+ if (NULL != cadet_handle)
{
- GNUNET_MESH_disconnect (mesh_handle);
- mesh_handle = NULL;
+ GNUNET_CADET_disconnect (cadet_handle);
+ cadet_handle = NULL;
}
if (NULL != dns_post_handle)
{
/**
- * Function called whenever a tunnel is destroyed. Should clean up
+ * Function called whenever a channel is destroyed. Should clean up
* the associated state and attempt to build a new one.
- *
- * It must NOT call #GNUNET_MESH_tunnel_destroy on the tunnel.
*
- * @param cls closure (the `struct MeshExit` set from #GNUNET_MESH_connect)
- * @param tunnel connection to the other end (henceforth invalid)
- * @param tunnel_ctx place where local state associated
- * with the tunnel is stored
+ * It must NOT call #GNUNET_CADET_channel_destroy on the channel.
+ *
+ * @param cls closure (the `struct CadetExit` set from #GNUNET_CADET_connect)
+ * @param channel connection to the other end (henceforth invalid)
+ * @param channel_ctx place where local state associated
+ * with the channel is stored
*/
static void
-mesh_tunnel_end_cb (void *cls,
- const struct GNUNET_MESH_Tunnel *tunnel,
- void *tunnel_ctx)
+cadet_channel_end_cb (void *cls,
+ const struct GNUNET_CADET_Channel *channel)
{
- struct MeshExit *exit = tunnel_ctx;
- struct MeshExit *alt;
- struct RequestContext *rc;
+ struct CadetExit *exit = cls;
+ struct CadetExit *alt;
+ struct RequestContext *rc;
- if (NULL != exit->mesh_th)
+ exit->cadet_channel = NULL;
+ dns_exit_available--;
+ /* open alternative channels */
+ /* our channel is now closed, move our requests to an alternative
+ channel */
+ alt = choose_exit ();
+ while (NULL != (rc = exit->receive_queue_head))
{
- GNUNET_MESH_notify_transmit_ready_cancel (exit->mesh_th);
- exit->mesh_th = NULL;
+ GNUNET_CONTAINER_DLL_remove (exit->receive_queue_head,
+ exit->receive_queue_tail,
+ rc);
+ rc->exit = alt;
+ GNUNET_CONTAINER_DLL_insert (alt->receive_queue_head,
+ alt->receive_queue_tail,
+ rc);
+ GNUNET_MQ_send (GNUNET_CADET_get_mq (alt->cadet_channel),
+ GNUNET_MQ_env_copy (rc->env));
}
- exit->mesh_tunnel = NULL;
- dns_exit_available--;
- /* open alternative tunnels */
try_open_exit ();
- if (NULL == exit->mesh_tunnel)
+}
+
+
+/**
+ * Function called whenever a channel has excess capacity.
+ *
+ * @param cls the `struct CadetExit`
+ * @param channel connection to the other end
+ * @param window_size how much capacity do we have
+ */
+static void
+channel_idle_notify_cb (void *cls,
+ const struct GNUNET_CADET_Channel *channel,
+ int window_size)
+{
+ struct CadetExit *pos = cls;
+
+ pos->idle = window_size;
+}
+
+
+/**
+ * We are short on cadet exits, try to open another one.
+ */
+static void
+try_open_exit ()
+{
+ struct CadetExit *pos;
+ uint32_t candidate_count;
+ uint32_t candidate_selected;
+ struct GNUNET_HashCode port;
+
+ GNUNET_CRYPTO_hash (GNUNET_APPLICATION_PORT_INTERNET_RESOLVER,
+ strlen (GNUNET_APPLICATION_PORT_INTERNET_RESOLVER),
+ &port);
+ candidate_count = 0;
+ for (pos = exit_head; NULL != pos; pos = pos->next)
+ if (NULL == pos->cadet_channel)
+ candidate_count++;
+ if (0 == candidate_count)
{
- /* our tunnel is now closed, move our requests to an alternative
- tunnel */
- alt = choose_exit ();
- while (NULL != (rc = exit->transmit_queue_head))
- {
- GNUNET_CONTAINER_DLL_remove (exit->transmit_queue_head,
- exit->transmit_queue_tail,
- rc);
- rc->exit = alt;
- GNUNET_CONTAINER_DLL_insert (alt->transmit_queue_head,
- alt->transmit_queue_tail,
- rc);
- }
- while (NULL != (rc = exit->receive_queue_head))
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "No DNS exits available yet.\n");
+ return;
+ }
+ candidate_selected = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
+ candidate_count);
+ candidate_count = 0;
+ for (pos = exit_head; NULL != pos; pos = pos->next)
+ if (NULL == pos->cadet_channel)
{
- GNUNET_CONTAINER_DLL_remove (exit->receive_queue_head,
- exit->receive_queue_tail,
- rc);
- rc->was_transmitted = GNUNET_NO;
- rc->exit = alt;
- GNUNET_CONTAINER_DLL_insert (alt->transmit_queue_head,
- alt->transmit_queue_tail,
- rc);
+ candidate_count++;
+ if (candidate_selected < candidate_count)
+ {
+ struct GNUNET_MQ_MessageHandler cadet_handlers[] = {
+ GNUNET_MQ_hd_var_size (dns_response,
+ GNUNET_MESSAGE_TYPE_VPN_DNS_FROM_INTERNET,
+ struct DnsResponseMessage,
+ pos),
+ GNUNET_MQ_handler_end ()
+ };
+
+
+ /* move to the head of the DLL */
+ pos->cadet_channel
+ = GNUNET_CADET_channel_create (cadet_handle,
+ pos,
+ &pos->peer,
+ &port,
+ GNUNET_CADET_OPTION_DEFAULT,
+ &channel_idle_notify_cb,
+ &cadet_channel_end_cb,
+ cadet_handlers);
+ if (NULL == pos->cadet_channel)
+ {
+ GNUNET_break (0);
+ continue;
+ }
+ GNUNET_CONTAINER_DLL_remove (exit_head,
+ exit_tail,
+ pos);
+ GNUNET_CONTAINER_DLL_insert (exit_head,
+ exit_tail,
+ pos);
+ dns_exit_available++;
+ return;
+ }
}
- }
- else
- {
- /* the same peer was chosen, just make sure the queue processing is restarted */
- alt = exit;
- }
- if ( (NULL == alt->mesh_th) &&
- (NULL != (rc = alt->transmit_queue_head)) )
- alt->mesh_th = GNUNET_MESH_notify_transmit_ready (alt->mesh_tunnel,
- GNUNET_NO,
- TIMEOUT,
- rc->mlen,
- &transmit_dns_request_to_mesh,
- alt);
+ GNUNET_assert (NULL == exit_head);
}
/**
- * Function called whenever we find an advertisement for a
- * DNS exit in the DHT. If we don't have a mesh tunnel,
+ * Function called whenever we find an advertisement for a
+ * DNS exit in the DHT. If we don't have a cadet channel,
* we should build one; otherwise, we should save the
* advertisement for later use.
*
handle_dht_result (void *cls,
struct GNUNET_TIME_Absolute exp,
const struct GNUNET_HashCode *key,
- const struct GNUNET_PeerIdentity *get_path,
+ const struct GNUNET_PeerIdentity *get_path,
unsigned int get_path_length,
const struct GNUNET_PeerIdentity *put_path,
unsigned int put_path_length,
size_t size, const void *data)
{
const struct GNUNET_DNS_Advertisement *ad;
- struct MeshExit *exit;
+ struct CadetExit *exit;
if (sizeof (struct GNUNET_DNS_Advertisement) != size)
{
return;
}
ad = data;
- for (exit = exit_head; NULL != exit; exit = exit->next)
- if (0 == memcmp (&ad->peer,
- &exit->peer,
- sizeof (struct GNUNET_PeerIdentity)))
+ for (exit = exit_head; NULL != exit; exit = exit->next)
+ if (0 == GNUNET_memcmp (&ad->peer,
+ &exit->peer))
break;
if (NULL == exit)
{
- exit = GNUNET_new (struct MeshExit);
+ exit = GNUNET_new (struct CadetExit);
exit->peer = ad->peer;
- /* tunnel is closed, so insert at the end */
+ /* channel is closed, so insert at the end */
GNUNET_CONTAINER_DLL_insert_tail (exit_head,
exit_tail,
exit);
struct GNUNET_HashCode dns_key;
cfg = cfg_;
- stats = GNUNET_STATISTICS_create ("pt", cfg);
- ipv4_pt = GNUNET_CONFIGURATION_get_value_yesno (cfg, "pt", "TUNNEL_IPV4");
- ipv6_pt = GNUNET_CONFIGURATION_get_value_yesno (cfg, "pt", "TUNNEL_IPV6");
- dns_tunnel = GNUNET_CONFIGURATION_get_value_yesno (cfg, "pt", "TUNNEL_DNS");
- if (! (ipv4_pt || ipv6_pt || dns_tunnel))
+ stats = GNUNET_STATISTICS_create ("pt",
+ cfg);
+ ipv4_pt = GNUNET_CONFIGURATION_get_value_yesno (cfg,
+ "pt",
+ "TUNNEL_IPV4");
+ ipv6_pt = GNUNET_CONFIGURATION_get_value_yesno (cfg,
+ "pt",
+ "TUNNEL_IPV6");
+ dns_channel = GNUNET_CONFIGURATION_get_value_yesno (cfg,
+ "pt",
+ "TUNNEL_DNS");
+ if (! (ipv4_pt || ipv6_pt || dns_channel))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("No useful service enabled. Exiting.\n"));
GNUNET_SCHEDULER_shutdown ();
- return;
+ return;
}
- GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
+ GNUNET_SCHEDULER_add_shutdown (&cleanup, cls);
if (ipv4_pt || ipv6_pt)
{
- dns_post_handle
- = GNUNET_DNS_connect (cfg,
+ dns_post_handle
+ = GNUNET_DNS_connect (cfg,
GNUNET_DNS_FLAG_POST_RESOLUTION,
- &dns_post_request_handler, NULL);
- if (NULL == dns_post_handle)
+ &dns_post_request_handler,
+ NULL);
+ if (NULL == dns_post_handle)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("Failed to connect to %s service. Exiting.\n"),
return;
}
}
- if (dns_tunnel)
+ if (dns_channel)
{
- static struct GNUNET_MESH_MessageHandler mesh_handlers[] = {
- {&receive_dns_response, GNUNET_MESSAGE_TYPE_VPN_DNS_FROM_INTERNET, 0},
- {NULL, 0, 0}
- };
-
- dns_pre_handle
- = GNUNET_DNS_connect (cfg,
+ dns_pre_handle
+ = GNUNET_DNS_connect (cfg,
GNUNET_DNS_FLAG_PRE_RESOLUTION,
- &dns_pre_request_handler, NULL);
- if (NULL == dns_pre_handle)
+ &dns_pre_request_handler,
+ NULL);
+ if (NULL == dns_pre_handle)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("Failed to connect to %s service. Exiting.\n"),
GNUNET_SCHEDULER_shutdown ();
return;
}
- mesh_handle = GNUNET_MESH_connect (cfg, NULL, NULL,
- &mesh_tunnel_end_cb,
- mesh_handlers, NULL);
- if (NULL == mesh_handle)
+ cadet_handle = GNUNET_CADET_connect (cfg);
+ if (NULL == cadet_handle)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("Failed to connect to %s service. Exiting.\n"),
- "MESH");
+ "CADET");
GNUNET_SCHEDULER_shutdown ();
return;
}
GNUNET_SCHEDULER_shutdown ();
return;
}
- GNUNET_CRYPTO_hash ("dns", strlen ("dns"), &dns_key);
+ GNUNET_CRYPTO_hash ("dns",
+ strlen ("dns"),
+ &dns_key);
dht_get = GNUNET_DHT_get_start (dht,
GNUNET_BLOCK_TYPE_DNS,
&dns_key,
1,
GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
NULL, 0,
- &handle_dht_result, NULL);
+ &handle_dht_result,
+ NULL);
}
}
* @return 0 ok, 1 on error
*/
int
-main (int argc, char *const *argv)
+main (int argc,
+ char *const *argv)
{
static const struct GNUNET_GETOPT_CommandLineOption options[] = {
GNUNET_GETOPT_OPTION_END
};
int ret;
- if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
+ if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc,
+ argv,
+ &argc,
+ &argv))
return 2;
ret = (GNUNET_OK ==
- GNUNET_PROGRAM_run (argc, argv, "gnunet-daemon-pt",
- gettext_noop
- ("Daemon to run to perform IP protocol translation to GNUnet"),
- options, &run, NULL)) ? 0 : 1;
+ GNUNET_PROGRAM_run (argc,
+ argv,
+ "gnunet-daemon-pt",
+ gettext_noop ("Daemon to run to perform IP protocol translation to GNUnet"),
+ options,
+ &run,
+ NULL))
+ ? 0
+ : 1;
GNUNET_free ((void*) argv);
return ret;
}
projects / oweals / gnunet.git / blobdiff