#include "gnunet-vpn-packet.h"
#include "gnunet_common.h"
#include "gnunet_protocols.h"
+#include "gnunet_applications.h"
#include <gnunet_mesh_service.h>
#include "gnunet_client_lib.h"
#include "gnunet_container_lib.h"
#include "gnunet_constants.h"
#include <block_dns.h>
-#include "gnunet-daemon-vpn-helper.h"
-#include "gnunet-daemon-vpn-dns.h"
-#include "gnunet-daemon-vpn.h"
-#include "gnunet-vpn-checksum.h"
-
-const struct GNUNET_CONFIGURATION_Handle *cfg;
-struct GNUNET_MESH_Handle *mesh_handle;
-struct GNUNET_CONTAINER_MultiHashMap* hashmap;
+#include "gnunet_dns_service.h"
+
+
+struct answer_packet_list
+{
+ struct answer_packet_list *next;
+ struct answer_packet_list *prev;
+ struct GNUNET_SERVER_Client *client;
+ struct answer_packet pkt;
+};
+
+
+struct map_entry
+{
+ /** The description of the service (used for service) */
+ struct GNUNET_vpn_service_descriptor desc;
+
+ /** The real address of the service (used for remote) */
+ char addrlen;
+ char addr[16];
+
+ struct GNUNET_MESH_Tunnel *tunnel;
+ uint16_t namelen;
+ char additional_ports[8192];
+
+ struct GNUNET_CONTAINER_HeapNode *heap_node;
+ GNUNET_HashCode hash;
+ /**
+ * After this struct the name is located in DNS-Format!
+ */
+};
+
+
+struct remote_addr
+{
+ char addrlen;
+ unsigned char addr[16];
+ char proto;
+};
+
+
+struct tunnel_notify_queue
+{
+ struct tunnel_notify_queue *next;
+ struct tunnel_notify_queue *prev;
+ size_t len;
+ void *cls;
+};
+
+
+struct tunnel_state
+{
+ struct GNUNET_MESH_TransmitHandle *th;
+ struct tunnel_notify_queue *head, *tail;
+
+ int addrlen;
+};
+
+
+static const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+static struct GNUNET_MESH_Handle *mesh_handle;
+
+static struct GNUNET_CONTAINER_MultiHashMap *hashmap;
+
static struct GNUNET_CONTAINER_Heap *heap;
+/**
+ * The handle to the helper
+ */
+static struct GNUNET_HELPER_Handle *helper_handle;
+
+/**
+ * Arguments to the exit helper.
+ */
+static char *vpn_argv[7];
+
+static struct GNUNET_DNS_Handle *dns_handle;
+
+static struct answer_packet_list *answer_proc_head;
+
+static struct answer_packet_list *answer_proc_tail;
+
/**
* If there are at least this many address-mappings, old ones will be removed
*/
*/
static struct GNUNET_CONTAINER_MultiHashMap *udp_connections;
+static GNUNET_SCHEDULER_TaskIdentifier conn_task;
+
+static GNUNET_SCHEDULER_TaskIdentifier shs_task;
+
+/**
+ * The tunnels that will be used to send tcp- and udp-packets
+ */
+static struct GNUNET_MESH_Tunnel *tcp_tunnel;
+static struct GNUNET_MESH_Tunnel *udp_tunnel;
+
+
+static unsigned int
+port_in_ports (uint64_t ports, uint16_t port)
+{
+ uint16_t *ps = (uint16_t *) & ports;
+
+ return ports == 0 || ps[0] == port || ps[1] == port || ps[2] == port ||
+ ps[3] == port;
+}
+
+
+/**
+ * Sets a bit active in a bitArray.
+ *
+ * @param bitArray memory area to set the bit in
+ * @param bitIdx which bit to set
+ */
+static void
+setBit (char *bitArray, unsigned int bitIdx)
+{
+ size_t arraySlot;
+ unsigned int targetBit;
+
+ arraySlot = bitIdx / 8;
+ targetBit = (1L << (bitIdx % 8));
+ bitArray[arraySlot] |= targetBit;
+}
+
+
+/**
+ * Checks if a bit is active in the bitArray
+ *
+ * @param bitArray memory area to set the bit in
+ * @param bitIdx which bit to test
+ * @return GNUNET_YES if the bit is set, GNUNET_NO if not.
+ */
+static int
+testBit (char *bitArray, unsigned int bitIdx)
+{
+ size_t slot;
+ unsigned int targetBit;
+
+ slot = bitIdx / 8;
+ targetBit = (1L << (bitIdx % 8));
+ if (bitArray[slot] & targetBit)
+ return GNUNET_YES;
+ else
+ return GNUNET_NO;
+}
+
+
/**
* Function scheduled as very last function, cleans up after us
*{{{
*/
static void
-cleanup(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
- GNUNET_assert (0 != (tskctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN));
+cleanup (void *cls GNUNET_UNUSED,
+ const struct GNUNET_SCHEDULER_TaskContext *tskctx)
+{
+ unsigned int i;
+
+ GNUNET_assert (0 != (tskctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN));
+ /* close the connection to the service-dns */
+ GNUNET_DNS_disconnect (dns_handle);
+ if (mesh_handle != NULL)
+ {
+ GNUNET_MESH_disconnect (mesh_handle);
+ mesh_handle = NULL;
+ }
+ if (helper_handle != NULL)
+ {
+ GNUNET_HELPER_stop (helper_handle);
+ helper_handle = NULL;
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != shs_task)
+ {
+ GNUNET_SCHEDULER_cancel (shs_task);
+ shs_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != conn_task)
+ {
+ GNUNET_SCHEDULER_cancel (conn_task);
+ conn_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ for (i=0;i<5;i++)
+ GNUNET_free_non_null (vpn_argv[i]);
+}
- /* stop the helper */
- cleanup_helper(helper_handle);
+/*}}}*/
- /* close the connection to the service-dns */
- if (dns_connection != NULL)
- {
- GNUNET_CLIENT_disconnect (dns_connection, GNUNET_NO);
- dns_connection = NULL;
- }
+/**
+ * @return the hash of the IP-Address if a mapping exists, NULL otherwise
+ */
+static GNUNET_HashCode *
+address6_mapping_exists (struct in6_addr *v6addr)
+{
+ unsigned char *addr = (unsigned char*) v6addr;
+ GNUNET_HashCode *key = GNUNET_malloc (sizeof (GNUNET_HashCode));
+ unsigned char *k = (unsigned char *) key;
- if (mesh_handle != NULL)
- {
- GNUNET_MESH_disconnect(mesh_handle);
- mesh_handle = NULL;
- }
+ memset (key, 0, sizeof (GNUNET_HashCode));
+ unsigned int i;
+
+ for (i = 0; i < 16; i++)
+ k[15 - i] = addr[i];
+
+ if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains (hashmap, key))
+ return key;
+ else
+ {
+ GNUNET_free (key);
+ return NULL;
+ }
}
-/*}}}*/
/**
* @return the hash of the IP-Address if a mapping exists, NULL otherwise
*/
-GNUNET_HashCode*
-address_mapping_exists(unsigned char addr[]) {
- GNUNET_HashCode* key = GNUNET_malloc(sizeof(GNUNET_HashCode));
- unsigned char* k = (unsigned char*)key;
- memset(key, 0, sizeof(GNUNET_HashCode));
- unsigned int i;
- for (i = 0; i < 16; i++)
- k[15-i] = addr[i];
+static GNUNET_HashCode *
+address4_mapping_exists (uint32_t addr)
+{
+ GNUNET_HashCode *key = GNUNET_malloc (sizeof (GNUNET_HashCode));
- if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains(hashmap, key))
- return key;
- else
- {
- GNUNET_free(key);
- return NULL;
- }
+ memset (key, 0, sizeof (GNUNET_HashCode));
+ unsigned char *c = (unsigned char *) &addr;
+ unsigned char *k = (unsigned char *) key;
+ unsigned int i;
+
+ for (i = 0; i < 4; i++)
+ k[3 - i] = c[i];
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "a4_m_e: getting with key %08x, addr is %08x, %d.%d.%d.%d\n",
+ *((uint32_t *) (key)), addr, c[0], c[1], c[2], c[3]);
+
+ if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains (hashmap, key))
+ return key;
+ else
+ {
+ GNUNET_free (key);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mapping not found!\n");
+ return NULL;
+ }
}
+
+static void *
+initialize_tunnel_state (int addrlen, struct GNUNET_MESH_TransmitHandle *th)
+{
+ struct tunnel_state *ts = GNUNET_malloc (sizeof *ts);
+
+ ts->addrlen = addrlen;
+ ts->th = th;
+ return ts;
+}
+
+
static void
-collect_mappings(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tc) {
- if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
- return;
+send_icmp4_response (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
+ return;
+
+ struct ip_icmp *request = cls;
- struct map_entry* me = GNUNET_CONTAINER_heap_remove_root(heap);
+ struct ip_icmp *response = alloca (ntohs (request->shdr.size));
- /* This is free()ed memory! */
- me->heap_node = NULL;
+ GNUNET_assert (response != NULL);
+ memset (response, 0, ntohs (request->shdr.size));
- /* FIXME! GNUNET_MESH_close_tunnel(me->tunnel); */
+ response->shdr.size = request->shdr.size;
+ response->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
- GNUNET_CONTAINER_multihashmap_remove(hashmap, &me->hash, me);
+ response->tun.flags = 0;
+ response->tun.type = htons (0x0800);
- GNUNET_free(me);
+ response->ip_hdr.hdr_lngth = 5;
+ response->ip_hdr.version = 4;
+ response->ip_hdr.proto = 0x01;
+ response->ip_hdr.dadr = request->ip_hdr.sadr;
+ response->ip_hdr.sadr = request->ip_hdr.dadr;
+ response->ip_hdr.tot_lngth = request->ip_hdr.tot_lngth;
+
+ response->ip_hdr.chks =
+ GNUNET_CRYPTO_crc16_n ((uint16_t *) & response->ip_hdr, 20);
+
+ response->icmp_hdr.code = 0;
+ response->icmp_hdr.type = 0x0;
+
+ /* Magic, more Magic! */
+ response->icmp_hdr.chks = request->icmp_hdr.chks + 0x8;
+
+ /* Copy the rest of the packet */
+ memcpy (response + 1, request + 1,
+ ntohs (request->shdr.size) - sizeof (struct ip_icmp));
+
+ (void) GNUNET_HELPER_send (helper_handle,
+ &response->shdr,
+ GNUNET_YES,
+ NULL, NULL);
+ GNUNET_free (request);
}
-void
-send_icmp_response(void* cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
- struct ip6_icmp* request = cls;
- struct ip6_icmp* response = alloca(ntohs(request->shdr.size));
- GNUNET_assert(response != NULL);
- memset(response, 0, ntohs(request->shdr.size));
+static void
+send_icmp6_response (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
+ return;
- response->shdr.size = request->shdr.size;
- response->shdr.type = htons(GNUNET_MESSAGE_TYPE_VPN_HELPER);
+ struct ip6_icmp *request = cls;
- response->tun.flags = 0;
- response->tun.type = htons(0x86dd);
+ struct ip6_icmp *response = alloca (ntohs (request->shdr.size));
- response->ip6_hdr.hoplmt = 255;
- response->ip6_hdr.paylgth = request->ip6_hdr.paylgth;
- response->ip6_hdr.nxthdr = 0x3a;
- response->ip6_hdr.version = 6;
- memcpy(&response->ip6_hdr.sadr, &request->ip6_hdr.dadr, 16);
- memcpy(&response->ip6_hdr.dadr, &request->ip6_hdr.sadr, 16);
+ GNUNET_assert (response != NULL);
+ memset (response, 0, ntohs (request->shdr.size));
- response->icmp_hdr.code = 0;
- response->icmp_hdr.type = 0x81;
+ response->shdr.size = request->shdr.size;
+ response->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
- /* Magic, more Magic! */
- response->icmp_hdr.chks = request->icmp_hdr.chks - 0x1;
+ response->tun.flags = 0;
+ response->tun.type = htons (0x86dd);
- /* Copy the rest of the packet */
- memcpy(response+1, request+1, ntohs(request->shdr.size) - sizeof(struct ip6_icmp));
+ response->ip6_hdr.hoplmt = 255;
+ response->ip6_hdr.paylgth = request->ip6_hdr.paylgth;
+ response->ip6_hdr.nxthdr = 0x3a;
+ response->ip6_hdr.version = 6;
+ memcpy (&response->ip6_hdr.sadr, &request->ip6_hdr.dadr, 16);
+ memcpy (&response->ip6_hdr.dadr, &request->ip6_hdr.sadr, 16);
- write_to_helper(response, ntohs(response->shdr.size));
+ response->icmp_hdr.code = 0;
+ response->icmp_hdr.type = 0x81;
- GNUNET_free(request);
+ /* Magic, more Magic! */
+ response->icmp_hdr.chks = request->icmp_hdr.chks - 0x1;
+
+ /* Copy the rest of the packet */
+ memcpy (response + 1, request + 1,
+ ntohs (request->shdr.size) - sizeof (struct ip6_icmp));
+
+ (void) GNUNET_HELPER_send (helper_handle,
+ &response->shdr,
+ GNUNET_YES,
+ NULL, NULL);
+ GNUNET_free (request);
}
+
/**
* cls is the pointer to a GNUNET_MessageHeader that is
* followed by the service-descriptor and the packet that should be sent;
send_pkt_to_peer_notify_callback (void *cls, size_t size, void *buf)
{
struct GNUNET_MESH_Tunnel **tunnel = cls;
- struct GNUNET_MessageHeader *hdr =
- (struct GNUNET_MessageHeader *) (tunnel + 1);
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "send_pkt_to_peer_notify_callback: buf = %x; size = %u;\n", buf, size);
- GNUNET_assert (size >= ntohs (hdr->size));
- memcpy (buf, hdr, ntohs (hdr->size));
- size = ntohs(hdr->size);
+
+ struct tunnel_state *ts = GNUNET_MESH_tunnel_get_data (*tunnel);
+
+ ts->th = NULL;
+
+ if (NULL != buf)
+ {
+ struct GNUNET_MessageHeader *hdr =
+ (struct GNUNET_MessageHeader *) (tunnel + 1);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "send_pkt_to_peer_notify_callback: buf = %x; size = %u;\n", buf,
+ size);
+ GNUNET_assert (size >= ntohs (hdr->size));
+ memcpy (buf, hdr, ntohs (hdr->size));
+ size = ntohs (hdr->size);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sent!\n");
+ }
+ else
+ size = 0;
+
+ if (NULL != ts->head)
+ {
+ struct tunnel_notify_queue *element = ts->head;
+
+ GNUNET_CONTAINER_DLL_remove (ts->head, ts->tail, element);
+
+ ts->th =
+ GNUNET_MESH_notify_transmit_ready (*tunnel, GNUNET_NO, 42,
+ GNUNET_TIME_relative_divide
+ (GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
+ (const struct GNUNET_PeerIdentity *)
+ NULL, element->len,
+ send_pkt_to_peer_notify_callback,
+ element->cls);
+
+ /* save the handle */
+ GNUNET_free (element);
+ }
GNUNET_free (cls);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sent!\n");
+
return size;
}
-unsigned int
-port_in_ports (uint64_t ports, uint16_t port)
-{
- uint16_t *ps = (uint16_t *) & ports;
- return ps[0] == port || ps[1] == port || ps[2] == port || ps[3] == port;
-}
-void
-send_pkt_to_peer (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_TRANSPORT_ATS_Information *atsi)
+static void
+send_pkt_to_peer (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_ATS_Information *atsi GNUNET_UNUSED)
{
- if (peer == NULL) return;
+ /* peer == NULL means that all peers in this request are connected */
+ if (peer == NULL)
+ return;
struct GNUNET_MESH_Tunnel **tunnel = cls;
struct GNUNET_MessageHeader *hdr =
- (struct GNUNET_MessageHeader *) (tunnel + 1);
-
- GNUNET_assert(NULL != tunnel);
- GNUNET_assert(NULL != *tunnel);
-
- GNUNET_MESH_notify_transmit_ready (*tunnel,
- GNUNET_NO,
- 42,
- GNUNET_TIME_relative_divide(GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
- (const struct GNUNET_PeerIdentity *)NULL,
- ntohs(hdr->size),
- send_pkt_to_peer_notify_callback,
- cls);
+ (struct GNUNET_MessageHeader *) (tunnel + 1);
+
+ GNUNET_assert (NULL != tunnel);
+ GNUNET_assert (NULL != *tunnel);
+
+ struct tunnel_state *ts = GNUNET_MESH_tunnel_get_data (*tunnel);
+
+ if (NULL == ts->th)
+ {
+ ts->th =
+ GNUNET_MESH_notify_transmit_ready (*tunnel, GNUNET_NO, 42,
+ GNUNET_TIME_relative_divide
+ (GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
+ (const struct GNUNET_PeerIdentity *)
+ NULL, ntohs (hdr->size),
+ send_pkt_to_peer_notify_callback,
+ cls);
+ }
+ else
+ {
+ struct tunnel_notify_queue *element = GNUNET_malloc (sizeof *element);
+
+ element->cls = cls;
+ element->len = ntohs (hdr->size);
+
+ GNUNET_CONTAINER_DLL_insert_tail (ts->head, ts->tail, element);
+ }
}
+
+
+
+/**
+ * Receive packets from the helper-process
+ */
+static void
+message_token (void *cls GNUNET_UNUSED, void *client GNUNET_UNUSED,
+ const struct GNUNET_MessageHeader *message)
+{
+ GNUNET_assert (ntohs (message->type) == GNUNET_MESSAGE_TYPE_VPN_HELPER);
+
+ struct tun_pkt *pkt_tun = (struct tun_pkt *) message;
+ GNUNET_HashCode *key;
+
+ /* ethertype is ipv6 */
+ if (ntohs (pkt_tun->tun.type) == 0x86dd)
+ {
+ struct ip6_pkt *pkt6 = (struct ip6_pkt *) message;
+
+ GNUNET_assert (pkt6->ip6_hdr.version == 6);
+ struct ip6_tcp *pkt6_tcp;
+ struct ip6_udp *pkt6_udp;
+ struct ip6_icmp *pkt6_icmp;
+
+ pkt6_udp = NULL; /* make compiler happy */
+ switch (pkt6->ip6_hdr.nxthdr)
+ {
+ case IPPROTO_UDP:
+ pkt6_udp = (struct ip6_udp *) pkt6;
+ /* Send dns-packets to the service-dns */
+ if (ntohs (pkt6_udp->udp_hdr.dpt) == 53)
+ {
+ /* 9 = 8 for the udp-header + 1 for the unsigned char data[1]; */
+ GNUNET_DNS_queue_request_v6 (dns_handle,
+ &pkt6->ip6_hdr.dadr,
+ &pkt6->ip6_hdr.sadr,
+ ntohs (pkt6_udp->udp_hdr.spt),
+ ntohs (pkt6_udp->udp_hdr.len) - 8,
+ (const void*) pkt6_udp->data);
+
+ break;
+ }
+ /* fall through */
+ case IPPROTO_TCP:
+ pkt6_tcp = (struct ip6_tcp *) pkt6;
+
+ if ((key = address6_mapping_exists (&pkt6->ip6_hdr.dadr)) != NULL)
+ {
+ struct map_entry *me = GNUNET_CONTAINER_multihashmap_get (hashmap, key);
+
+ GNUNET_assert (me != NULL);
+ GNUNET_free (key);
+
+ size_t size =
+ sizeof (struct GNUNET_MESH_Tunnel *) +
+ sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode) +
+ ntohs (pkt6->ip6_hdr.paylgth);
+
+ struct GNUNET_MESH_Tunnel **cls = GNUNET_malloc (size);
+ struct GNUNET_MessageHeader *hdr =
+ (struct GNUNET_MessageHeader *) (cls + 1);
+ GNUNET_HashCode *hc = (GNUNET_HashCode *) (hdr + 1);
+
+ hdr->size =
+ htons (sizeof (struct GNUNET_MessageHeader) +
+ sizeof (GNUNET_HashCode) + ntohs (pkt6->ip6_hdr.paylgth));
+
+ GNUNET_MESH_ApplicationType app_type = 0; /* fix compiler uninitialized warning... */
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "me->addrlen is %d\n",
+ me->addrlen);
+ if (me->addrlen == 0)
+ {
+ /* This is a mapping to a gnunet-service */
+ memcpy (hc, &me->desc.service_descriptor, sizeof (GNUNET_HashCode));
+
+ if (IPPROTO_UDP == pkt6->ip6_hdr.nxthdr &&
+ (me->desc.service_type & htonl (GNUNET_DNS_SERVICE_TYPE_UDP)) &&
+ (port_in_ports (me->desc.ports, pkt6_udp->udp_hdr.dpt) ||
+ testBit (me->additional_ports, ntohs (pkt6_udp->udp_hdr.dpt))))
+ {
+ hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_SERVICE_UDP);
+
+ memcpy (hc + 1, &pkt6_udp->udp_hdr, ntohs (pkt6_udp->udp_hdr.len));
+
+ }
+ else if (IPPROTO_TCP == pkt6->ip6_hdr.nxthdr &&
+ (me->desc.service_type & htonl (GNUNET_DNS_SERVICE_TYPE_TCP))
+ && (port_in_ports (me->desc.ports, pkt6_tcp->tcp_hdr.dpt)))
+ {
+ hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_SERVICE_TCP);
+
+ memcpy (hc + 1, &pkt6_tcp->tcp_hdr, ntohs (pkt6->ip6_hdr.paylgth));
+
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "pip: %d\n",
+ port_in_ports (me->desc.ports, pkt6_tcp->tcp_hdr.dpt));
+ GNUNET_assert (0);
+ }
+ if (me->tunnel == NULL && NULL != cls)
+ {
+ *cls =
+ GNUNET_MESH_tunnel_create (mesh_handle,
+ initialize_tunnel_state (16, NULL),
+ &send_pkt_to_peer, NULL, cls);
+
+ GNUNET_MESH_peer_request_connect_add (*cls,
+ (struct GNUNET_PeerIdentity *)
+ &me->desc.peer);
+ me->tunnel = *cls;
+ }
+ else if (NULL != cls)
+ {
+ *cls = me->tunnel;
+ send_pkt_to_peer (cls, (struct GNUNET_PeerIdentity *) 1, NULL);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Queued to send IPv6 to peer %x, type %d\n",
+ *((unsigned int *) &me->desc.peer), ntohs (hdr->type));
+ }
+ }
+ else
+ {
+ /* This is a mapping to a "real" address */
+ struct remote_addr *s = (struct remote_addr *) hc;
+
+ s->addrlen = me->addrlen;
+ memcpy (s->addr, me->addr, me->addrlen);
+ s->proto = pkt6->ip6_hdr.nxthdr;
+ if (s->proto == IPPROTO_UDP)
+ {
+ hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_REMOTE_UDP);
+ memcpy (hc + 1, &pkt6_udp->udp_hdr, ntohs (pkt6_udp->udp_hdr.len));
+ app_type = GNUNET_APPLICATION_TYPE_INTERNET_UDP_GATEWAY;
+ if (NULL != udp_tunnel)
+ me->tunnel = udp_tunnel;
+ }
+ else if (s->proto == IPPROTO_TCP)
+ {
+ hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_REMOTE_TCP);
+ memcpy (hc + 1, &pkt6_tcp->tcp_hdr, ntohs (pkt6->ip6_hdr.paylgth));
+ app_type = GNUNET_APPLICATION_TYPE_INTERNET_TCP_GATEWAY;
+ if (NULL != tcp_tunnel)
+ me->tunnel = tcp_tunnel;
+ }
+ else
+ {
+ GNUNET_assert (0);
+ }
+ if (me->tunnel == NULL && NULL != cls)
+ {
+ *cls =
+ GNUNET_MESH_tunnel_create (mesh_handle,
+ initialize_tunnel_state (16, NULL),
+ &send_pkt_to_peer, NULL, cls);
+
+ GNUNET_MESH_peer_request_connect_by_type (*cls, app_type);
+ me->tunnel = *cls;
+ if (GNUNET_APPLICATION_TYPE_INTERNET_UDP_GATEWAY == app_type)
+ udp_tunnel = *cls;
+ else if (GNUNET_APPLICATION_TYPE_INTERNET_TCP_GATEWAY == app_type)
+ tcp_tunnel = *cls;
+ }
+ else if (NULL != cls)
+ {
+ *cls = me->tunnel;
+ send_pkt_to_peer (cls, (struct GNUNET_PeerIdentity *) 1, NULL);
+ }
+ }
+ }
+ else
+ {
+ char pbuf[INET6_ADDRSTRLEN];
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Packet to %s, which has no mapping\n",
+ inet_ntop (AF_INET6,
+ &pkt6->ip6_hdr.dadr,
+ pbuf,
+ sizeof (pbuf)));
+ }
+ break;
+ case 0x3a:
+ /* ICMPv6 */
+ pkt6_icmp = (struct ip6_icmp *) pkt6;
+ /* If this packet is an icmp-echo-request and a mapping exists, answer */
+ if (pkt6_icmp->icmp_hdr.type == 0x80 &&
+ (key = address6_mapping_exists (&pkt6->ip6_hdr.dadr)) != NULL)
+ {
+ GNUNET_free (key);
+ pkt6_icmp = GNUNET_malloc (ntohs (pkt6->shdr.size));
+ memcpy (pkt6_icmp, pkt6, ntohs (pkt6->shdr.size));
+ GNUNET_SCHEDULER_add_now (&send_icmp6_response, pkt6_icmp);
+ }
+ break;
+ }
+ }
+ /* ethertype is ipv4 */
+ else if (ntohs (pkt_tun->tun.type) == 0x0800)
+ {
+ struct ip_pkt *pkt = (struct ip_pkt *) message;
+ struct ip_udp *udp = (struct ip_udp *) message;
+ struct ip_tcp *pkt_tcp;
+ struct ip_udp *pkt_udp;
+ struct ip_icmp *pkt_icmp;
+
+ GNUNET_assert (pkt->ip_hdr.version == 4);
+
+ /* Send dns-packets to the service-dns */
+ if (pkt->ip_hdr.proto == IPPROTO_UDP && ntohs (udp->udp_hdr.dpt) == 53)
+ {
+ GNUNET_DNS_queue_request_v4 (dns_handle,
+ &pkt->ip_hdr.dadr,
+ &pkt->ip_hdr.sadr,
+ ntohs (udp->udp_hdr.spt),
+ ntohs (udp->udp_hdr.len) - 8,
+ (const void*) udp->data);
+ }
+ else
+ {
+ uint32_t dadr = pkt->ip_hdr.dadr.s_addr;
+ unsigned char *c = (unsigned char *) &dadr;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Packet to %d.%d.%d.%d, proto %x\n",
+ c[0], c[1], c[2], c[3], pkt->ip_hdr.proto);
+ switch (pkt->ip_hdr.proto)
+ {
+ case IPPROTO_TCP:
+ case IPPROTO_UDP:
+ pkt_tcp = (struct ip_tcp *) pkt;
+ pkt_udp = (struct ip_udp *) pkt;
+
+ if ((key = address4_mapping_exists (dadr)) != NULL)
+ {
+ struct map_entry *me =
+ GNUNET_CONTAINER_multihashmap_get (hashmap, key);
+ GNUNET_assert (me != NULL);
+ GNUNET_free (key);
+
+ size_t size =
+ sizeof (struct GNUNET_MESH_Tunnel *) +
+ sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode) +
+ ntohs (pkt->ip_hdr.tot_lngth) - 4 * pkt->ip_hdr.hdr_lngth;
+
+ struct GNUNET_MESH_Tunnel **cls = GNUNET_malloc (size);
+ struct GNUNET_MessageHeader *hdr =
+ (struct GNUNET_MessageHeader *) (cls + 1);
+ GNUNET_HashCode *hc = (GNUNET_HashCode *) (hdr + 1);
+
+ hdr->size =
+ htons (sizeof (struct GNUNET_MessageHeader) +
+ sizeof (GNUNET_HashCode) + ntohs (pkt->ip_hdr.tot_lngth) -
+ 4 * pkt->ip_hdr.hdr_lngth);
+
+ GNUNET_MESH_ApplicationType app_type = 0; /* make compiler happy */
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "me->addrlen is %d\n",
+ me->addrlen);
+ if (me->addrlen == 0)
+ {
+ /* This is a mapping to a gnunet-service */
+ memcpy (hc, &me->desc.service_descriptor, sizeof (GNUNET_HashCode));
+
+ if ((IPPROTO_UDP == pkt->ip_hdr.proto) &&
+ (me->desc.service_type & htonl (GNUNET_DNS_SERVICE_TYPE_UDP)) &&
+ (port_in_ports (me->desc.ports, pkt_udp->udp_hdr.dpt) ||
+ testBit (me->additional_ports, ntohs (pkt_udp->udp_hdr.dpt))))
+ {
+ hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_SERVICE_UDP);
+
+ memcpy (hc + 1, &pkt_udp->udp_hdr, ntohs (pkt_udp->udp_hdr.len));
+
+ }
+ else if ((IPPROTO_TCP == pkt->ip_hdr.proto) &&
+ (me->
+ desc.service_type & htonl (GNUNET_DNS_SERVICE_TYPE_TCP))
+ && (port_in_ports (me->desc.ports, pkt_tcp->tcp_hdr.dpt)))
+ {
+ hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_SERVICE_TCP);
+
+ memcpy (hc + 1, &pkt_tcp->tcp_hdr,
+ ntohs (pkt->ip_hdr.tot_lngth) -
+ 4 * pkt->ip_hdr.hdr_lngth);
+
+ }
+ if (me->tunnel == NULL && NULL != cls)
+ {
+ *cls =
+ GNUNET_MESH_tunnel_create (mesh_handle,
+ initialize_tunnel_state (4, NULL),
+ send_pkt_to_peer, NULL, cls);
+ GNUNET_MESH_peer_request_connect_add (*cls,
+ (struct GNUNET_PeerIdentity
+ *) &me->desc.peer);
+ me->tunnel = *cls;
+ }
+ else if (NULL != cls)
+ {
+ *cls = me->tunnel;
+ send_pkt_to_peer (cls, (struct GNUNET_PeerIdentity *) 1, NULL);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Queued to send IPv4 to peer %x, type %d\n",
+ *((unsigned int *) &me->desc.peer),
+ ntohs (hdr->type));
+ }
+ }
+ else
+ {
+ /* This is a mapping to a "real" address */
+ struct remote_addr *s = (struct remote_addr *) hc;
+
+ s->addrlen = me->addrlen;
+ memcpy (s->addr, me->addr, me->addrlen);
+ s->proto = pkt->ip_hdr.proto;
+ if (s->proto == IPPROTO_UDP)
+ {
+ hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_REMOTE_UDP);
+ memcpy (hc + 1, &pkt_udp->udp_hdr, ntohs (pkt_udp->udp_hdr.len));
+ app_type = GNUNET_APPLICATION_TYPE_INTERNET_UDP_GATEWAY;
+ }
+ else if (s->proto == IPPROTO_TCP)
+ {
+ hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_REMOTE_TCP);
+ memcpy (hc + 1, &pkt_tcp->tcp_hdr,
+ ntohs (pkt->ip_hdr.tot_lngth) -
+ 4 * pkt->ip_hdr.hdr_lngth);
+ app_type = GNUNET_APPLICATION_TYPE_INTERNET_TCP_GATEWAY;
+ }
+ else
+ GNUNET_assert (0);
+ if (me->tunnel == NULL && NULL != cls)
+ {
+ *cls =
+ GNUNET_MESH_tunnel_create (mesh_handle,
+ initialize_tunnel_state (4, NULL),
+ send_pkt_to_peer, NULL, cls);
+
+ GNUNET_MESH_peer_request_connect_by_type (*cls, app_type);
+ me->tunnel = *cls;
+ }
+ else if (NULL != cls)
+ {
+ *cls = me->tunnel;
+ send_pkt_to_peer (cls, (struct GNUNET_PeerIdentity *) 1, NULL);
+ }
+ }
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Packet to %x which has no mapping\n", dadr);
+ }
+ break;
+ case 0x01:
+ /* ICMP */
+ pkt_icmp = (struct ip_icmp *) pkt;
+ if (pkt_icmp->icmp_hdr.type == 0x8 &&
+ (key = address4_mapping_exists (dadr)) != NULL)
+ {
+ GNUNET_free (key);
+ pkt_icmp = GNUNET_malloc (ntohs (pkt->shdr.size));
+ memcpy (pkt_icmp, pkt, ntohs (pkt->shdr.size));
+ GNUNET_SCHEDULER_add_now (&send_icmp4_response, pkt_icmp);
+ }
+ break;
+ }
+ }
+ }
+}
+
+
+
+static void
+collect_mappings (void *cls GNUNET_UNUSED,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
+ return;
+
+ struct map_entry *me = GNUNET_CONTAINER_heap_remove_root (heap);
+
+ /* This is free()ed memory! */
+ me->heap_node = NULL;
+
+ /* FIXME! GNUNET_MESH_close_tunnel(me->tunnel); */
+
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (hashmap, &me->hash, me));
+
+ GNUNET_free (me);
+}
+
+
/**
* Create a new Address from an answer-packet
*/
-void
-new_ip6addr(unsigned char* buf, const GNUNET_HashCode *peer, const GNUNET_HashCode *service_desc) { /* {{{ */
- char* ipv6addr;
- unsigned long long ipv6prefix;
- GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "vpn", "IPV6ADDR", &ipv6addr));
- GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "vpn", "IPV6PREFIX", &ipv6prefix));
- GNUNET_assert(ipv6prefix < 127);
- ipv6prefix = (ipv6prefix + 7)/8;
-
- inet_pton (AF_INET6, ipv6addr, buf);
- GNUNET_free(ipv6addr);
-
- int peer_length = 16 - ipv6prefix - 6;
- if (peer_length <= 0)
- peer_length = 0;
-
- int service_length = 16 - ipv6prefix - peer_length;
- if (service_length <= 0)
- service_length = 0;
-
- memcpy(buf+ipv6prefix, service_desc, service_length);
- memcpy(buf+ipv6prefix+service_length, peer, peer_length);
+static void
+new_ip6addr (struct in6_addr *v6addr,
+ const GNUNET_HashCode * peer,
+ const GNUNET_HashCode * service_desc)
+{ /* {{{ */
+ unsigned char *buf = (unsigned char*) v6addr;
+ char *ipv6addr;
+ unsigned long long ipv6prefix;
+
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV6ADDR",
+ &ipv6addr));
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONFIGURATION_get_value_number (cfg, "vpn",
+ "IPV6PREFIX",
+ &ipv6prefix));
+ GNUNET_assert (ipv6prefix < 127);
+ ipv6prefix = (ipv6prefix + 7) / 8;
+
+ inet_pton (AF_INET6, ipv6addr, buf);
+ GNUNET_free (ipv6addr);
+
+ int peer_length = 16 - ipv6prefix - 6;
+
+ if (peer_length <= 0)
+ peer_length = 0;
+
+ int service_length = 16 - ipv6prefix - peer_length;
+
+ if (service_length <= 0)
+ service_length = 0;
+
+ memcpy (buf + ipv6prefix, service_desc, service_length);
+ memcpy (buf + ipv6prefix + service_length, peer, peer_length);
}
+
/*}}}*/
/**
* Create a new Address from an answer-packet
*/
-void
-new_ip6addr_remote (unsigned char *buf, unsigned char *addr, char addrlen)
+static void
+new_ip6addr_remote (struct in6_addr *v6addr,
+ unsigned char *addr, char addrlen)
{ /* {{{ */
+ unsigned char *buf = (unsigned char*) v6addr;
char *ipv6addr;
unsigned long long ipv6prefix;
+
GNUNET_assert (GNUNET_OK ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "vpn",
- "IPV6ADDR",
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV6ADDR",
&ipv6addr));
GNUNET_assert (GNUNET_OK ==
GNUNET_CONFIGURATION_get_value_number (cfg, "vpn",
int local_length = 16 - ipv6prefix;
- memcpy (buf + ipv6prefix, addr, GNUNET_MAX (addrlen, local_length));
+ memcpy (buf + ipv6prefix, addr, GNUNET_MIN (addrlen, local_length));
+}
+
+/*}}}*/
+
+/**
+ * Create a new Address from an answer-packet
+ */
+static void
+new_ip4addr_remote (unsigned char *buf, unsigned char *addr, char addrlen)
+{ /* {{{ */
+ char *ipv4addr;
+ char *ipv4mask;
+
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV4ADDR",
+ &ipv4addr));
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV4MASK",
+ &ipv4mask));
+ uint32_t mask;
+
+ inet_pton (AF_INET, ipv4addr, buf);
+ int r = inet_pton (AF_INET, ipv4mask, &mask);
+
+ mask = htonl (mask);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "inet_pton: %d; %m; mask: %08x\n", r,
+ mask);
+
+ GNUNET_free (ipv4addr);
+
+ int c;
+
+ if (mask)
+ {
+ mask = (mask ^ (mask - 1)) >> 1;
+ for (c = 0; mask; c++)
+ {
+ mask >>= 1;
+ }
+ }
+ else
+ {
+ c = CHAR_BIT * sizeof (mask);
+ }
+
+ c = 32 - c;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "The mask %s has %d leading 1s.\n",
+ ipv4mask, c);
+
+ GNUNET_free (ipv4mask);
+
+ if (c % 8 == 0)
+ c = c / 8;
+ else
+ GNUNET_assert (0);
+
+ memcpy (buf + c, addr, GNUNET_MIN (addrlen, 4 - c));
}
+
/*}}}*/
/**
* At the moment this means "inventing" and IPv6-Address for .gnunet-services and
* doing nothing for "real" services.
*/
-void
-process_answer(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tc) {
- struct answer_packet* pkt = cls;
- struct answer_packet_list* list;
-
- /* This answer is about a .gnunet-service
- *
- * It contains an almost complete DNS-Response, we have to fill in the ip
- * at the offset pkt->addroffset
+static void
+process_answer (void *cls,
+ const struct answer_packet *pkt)
+{
+ struct answer_packet_list *list;
+
+ /* This answer is about a .gnunet-service
+ *
+ * It contains an almost complete DNS-Response, we have to fill in the ip
+ * at the offset pkt->addroffset
+ */
+ if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_SERVICE)
+ {
+
+ GNUNET_HashCode key;
+
+ memset (&key, 0, sizeof (GNUNET_HashCode));
+
+ list =
+ GNUNET_malloc (htons (pkt->hdr.size) +
+ sizeof (struct answer_packet_list) -
+ sizeof (struct answer_packet));
+ memcpy (&list->pkt, pkt, htons (pkt->hdr.size));
+
+ unsigned char *c = ((unsigned char *) &list->pkt) + ntohs (pkt->addroffset);
+ unsigned char *k = (unsigned char *) &key;
+
+ new_ip6addr ((struct in6_addr*) c,
+ &pkt->service_descr.peer,
+ &pkt->service_descr.service_descriptor);
+ /*
+ * Copy the newly generated ip-address to the key backwarts (as only the first part is hashed)
*/
- if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_SERVICE)
- {
- pkt->subtype = GNUNET_DNS_ANSWER_TYPE_IP;
+ unsigned int i;
- GNUNET_HashCode key;
- memset(&key, 0, sizeof(GNUNET_HashCode));
+ for (i = 0; i < 16; i++)
+ k[15 - i] = c[i];
- unsigned char* c = ((unsigned char*)pkt)+ntohs(pkt->addroffset);
- unsigned char* k = (unsigned char*)&key;
- new_ip6addr(c, &pkt->service_descr.peer, &pkt->service_descr.service_descriptor);
- /*
- * Copy the newly generated ip-address to the key backwarts (as only the first part is hashed)
- */
- unsigned int i;
- for (i = 0; i < 16; i++)
- k[15-i] = c[i];
+ uint16_t namelen = strlen ((char *) pkt->data + 12) + 1;
- uint16_t namelen = strlen((char*)pkt->data+12)+1;
+ struct map_entry *value =
+ GNUNET_malloc (sizeof (struct map_entry) + namelen);
+ char *name = (char *) (value + 1);
- struct map_entry* value = GNUNET_malloc(sizeof(struct map_entry) + namelen);
- char* name = (char*)(value +1);
+ value->namelen = namelen;
+ memcpy (name, pkt->data + 12, namelen);
- value->namelen = namelen;
- memcpy(name, pkt->data+12, namelen);
+ memcpy (&value->desc, &pkt->service_descr,
+ sizeof (struct GNUNET_vpn_service_descriptor));
- memcpy(&value->desc, &pkt->service_descr, sizeof(struct GNUNET_vpn_service_descriptor));
+ memset (value->additional_ports, 0, 8192);
- memset(value->additional_ports, 0, 8192);
+ memcpy (&value->hash, &key, sizeof (GNUNET_HashCode));
- memcpy(&value->hash, &key, sizeof(GNUNET_HashCode));
+ if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (hashmap, &key))
+ {
+ GNUNET_CONTAINER_multihashmap_put (hashmap, &key, value,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
- if (GNUNET_NO ==
- GNUNET_CONTAINER_multihashmap_contains (hashmap, &key))
- {
- GNUNET_CONTAINER_multihashmap_put (hashmap, &key, value,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
+ value->heap_node =
+ GNUNET_CONTAINER_heap_insert (heap, value,
+ GNUNET_TIME_absolute_get ().abs_value);
+ if (GNUNET_CONTAINER_heap_get_size (heap) > max_mappings)
+ GNUNET_SCHEDULER_add_now (collect_mappings, NULL);
+ }
+ else
+ GNUNET_free (value);
- value->heap_node = GNUNET_CONTAINER_heap_insert (heap, value,
- GNUNET_TIME_absolute_get ().abs_value);
- if (GNUNET_CONTAINER_heap_get_size(heap) > max_mappings)
- GNUNET_SCHEDULER_add_now(collect_mappings, NULL);
- }
- else
- GNUNET_free(value);
+ list->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_IP;
- list = GNUNET_malloc(htons(pkt->hdr.size) + 2*sizeof(struct answer_packet_list*));
- memcpy(&list->pkt, pkt, htons(pkt->hdr.size));
+ }
+ else if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_REV)
+ {
+ GNUNET_HashCode key;
- }
- else if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_REV)
- {
- GNUNET_HashCode key;
- memset(&key, 0, sizeof key);
- unsigned char* k = (unsigned char*)&key;
- unsigned char* s = pkt->data+12;
- int i = 0;
- /* Whoever designed the reverse IPv6-lookup is batshit insane */
- for (i = 0; i < 16; i++)
- {
- unsigned char c1 = s[(4*i)+1];
- unsigned char c2 = s[(4*i)+3];
- if (c1 <= '9')
- k[i] = c1 - '0';
- else
- k[i] = c1 - 87; /* 87 is the difference between 'a' and 10 */
- if (c2 <= '9')
- k[i] += 16*(c2 - '0');
- else
- k[i] += 16*(c2 - 87);
- }
-
- struct map_entry* map_entry = GNUNET_CONTAINER_multihashmap_get(hashmap, &key);
- GNUNET_CONTAINER_heap_update_cost (heap, map_entry->heap_node,
- GNUNET_TIME_absolute_get ().abs_value);
-
- uint16_t offset = ntohs(pkt->addroffset);
-
- if (map_entry == NULL)
- {
- GNUNET_free(pkt);
- return;
- }
-
- unsigned short namelen = htons(map_entry->namelen);
- char* name = (char*)(map_entry + 1);
-
- list = GNUNET_malloc(2*sizeof(struct answer_packet_list*) + offset + 2 + ntohs(namelen));
-
- struct answer_packet* rpkt = &list->pkt;
-
- /* The offset points to the first byte belonging to the address */
- memcpy(rpkt, pkt, offset - 1);
-
- rpkt->subtype = GNUNET_DNS_ANSWER_TYPE_IP;
- rpkt->hdr.size = ntohs(offset + 2 + ntohs(namelen));
-
- memcpy(((char*)rpkt)+offset, &namelen, 2);
- memcpy(((char*)rpkt)+offset+2, name, ntohs(namelen));
+ memset (&key, 0, sizeof key);
+ unsigned char *k = (unsigned char *) &key;
+ const unsigned char *s = pkt->data + 12;
+ int i = 0;
- }
- else if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_IP)
- {
- list = GNUNET_malloc(htons(pkt->hdr.size) + 2*sizeof(struct answer_packet_list*));
- memcpy(&list->pkt, pkt, htons(pkt->hdr.size));
- }
- else if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_REMOTE)
- {
- pkt->subtype = GNUNET_DNS_ANSWER_TYPE_IP;
+ /* Whoever designed the reverse IPv6-lookup is batshit insane */
+ for (i = 0; i < 16; i++)
+ {
+ unsigned char c1 = s[(4 * i) + 1];
+ unsigned char c2 = s[(4 * i) + 3];
+
+ if (c1 <= '9')
+ k[i] = c1 - '0';
+ else
+ k[i] = c1 - 87; /* 87 is the difference between 'a' and 10 */
+ if (c2 <= '9')
+ k[i] += 16 * (c2 - '0');
+ else
+ k[i] += 16 * (c2 - 87);
+ }
+
+ struct map_entry *map_entry =
+ GNUNET_CONTAINER_multihashmap_get (hashmap, &key);
+ uint16_t offset = ntohs (pkt->addroffset);
+
+ if (map_entry == NULL)
+ return;
- GNUNET_HashCode key;
- memset(&key, 0, sizeof(GNUNET_HashCode));
+ GNUNET_CONTAINER_heap_update_cost (heap, map_entry->heap_node,
+ GNUNET_TIME_absolute_get ().abs_value);
- unsigned char* c = ((unsigned char*)pkt)+ntohs(pkt->addroffset);
- new_ip6addr_remote(c, pkt->addr, pkt->addrsize);
- unsigned char* k = (unsigned char*)&key;
- /*
- * Copy the newly generated ip-address to the key backwards (as only the first part is used in the hash-table)
- */
- unsigned int i;
- for (i = 0; i < 16; i++)
- k[15-i] = c[i];
- uint16_t namelen = strlen((char*)pkt->data+12)+1;
+ unsigned short namelen = htons (map_entry->namelen);
+ char *name = (char *) (map_entry + 1);
- struct map_entry* value = GNUNET_malloc(sizeof(struct map_entry) + namelen);
- char* name = (char*)(value +1);
+ list =
+ GNUNET_malloc (sizeof (struct answer_packet_list) -
+ sizeof (struct answer_packet) + offset + 2 +
+ ntohs (namelen));
- value->namelen = namelen;
- memcpy(name, pkt->data+12, namelen);
+ struct answer_packet *rpkt = &list->pkt;
- value->addrlen = pkt->addrsize;
- memcpy(&value->addr, &pkt->addr, pkt->addrsize);
- memset(value->additional_ports, 0, 8192);
+ /* The offset points to the first byte belonging to the address */
+ memcpy (rpkt, pkt, offset - 1);
- memcpy(&value->hash, &key, sizeof(GNUNET_HashCode));
+ rpkt->subtype = GNUNET_DNS_ANSWER_TYPE_IP;
+ rpkt->hdr.size = ntohs (offset + 2 + ntohs (namelen));
- if (GNUNET_NO ==
- GNUNET_CONTAINER_multihashmap_contains (hashmap, &key))
- {
- GNUNET_CONTAINER_multihashmap_put (hashmap, &key, value,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
- value->heap_node = GNUNET_CONTAINER_heap_insert (heap, value,
- GNUNET_TIME_absolute_get ().abs_value);
- if (GNUNET_CONTAINER_heap_get_size(heap) > max_mappings)
- GNUNET_SCHEDULER_add_now(collect_mappings, NULL);
- }
- else
- GNUNET_free(value);
+ memcpy (((char *) rpkt) + offset, &namelen, 2);
+ memcpy (((char *) rpkt) + offset + 2, name, ntohs (namelen));
- list = GNUNET_malloc(htons(pkt->hdr.size) + 2*sizeof(struct answer_packet_list*));
+ }
+ else if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_IP)
+ {
+ list =
+ GNUNET_malloc (htons (pkt->hdr.size) +
+ sizeof (struct answer_packet_list) -
+ sizeof (struct answer_packet));
+ memcpy (&list->pkt, pkt, htons (pkt->hdr.size));
+ }
+ else if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_REMOTE_AAAA)
+ {
- memcpy(&list->pkt, pkt, htons(pkt->hdr.size));
- }
+ GNUNET_HashCode key;
+
+ memset (&key, 0, sizeof (GNUNET_HashCode));
+
+ list =
+ GNUNET_malloc (htons (pkt->hdr.size) +
+ sizeof (struct answer_packet_list) -
+ sizeof (struct answer_packet));
+
+ memcpy (&list->pkt, pkt, htons (pkt->hdr.size));
+ list->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_IP;
+
+ unsigned char *c = ((unsigned char *) &list->pkt) + ntohs (list->pkt.addroffset);
+
+ new_ip6addr_remote ((struct in6_addr*) c,
+ list->pkt.addr, list->pkt.addrsize);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "New mapping to %02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x\n",
+ c[0], c[1], c[2], c[3], c[4], c[5], c[6], c[7], c[8], c[9],
+ c[10], c[11], c[12], c[13], c[14], c[15]);
+ unsigned char *k = (unsigned char *) &key;
+
+ /*
+ * Copy the newly generated ip-address to the key backwards (as only the first part is used in the hash-table)
+ */
+ unsigned int i;
+
+ for (i = 0; i < 16; i++)
+ k[15 - i] = c[i];
+
+ uint16_t namelen = strlen ((char *) pkt->data + 12) + 1;
+
+ struct map_entry *value =
+ GNUNET_malloc (sizeof (struct map_entry) + namelen);
+ char *name = (char *) (value + 1);
+
+ value->namelen = namelen;
+ memcpy (name, pkt->data + 12, namelen);
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Setting addrlen to %d\n",
+ pkt->addrsize);
+ value->addrlen = pkt->addrsize;
+ memcpy (&value->addr, &pkt->addr, pkt->addrsize);
+ memset (value->additional_ports, 0, 8192);
+
+ memcpy (&value->hash, &key, sizeof (GNUNET_HashCode));
+
+ if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (hashmap, &key))
+ {
+ GNUNET_CONTAINER_multihashmap_put (hashmap, &key, value,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
+ value->heap_node =
+ GNUNET_CONTAINER_heap_insert (heap, value,
+ GNUNET_TIME_absolute_get ().abs_value);
+ if (GNUNET_CONTAINER_heap_get_size (heap) > max_mappings)
+ GNUNET_SCHEDULER_add_now (collect_mappings, NULL);
+ }
else
- {
- GNUNET_break(0);
- GNUNET_free(pkt);
- return;
- }
+ GNUNET_free (value);
- GNUNET_free(pkt);
- GNUNET_CONTAINER_DLL_insert_after(answer_proc_head, answer_proc_tail, answer_proc_tail, list);
+ }
+ else if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_REMOTE_A)
+ {
+ list =
+ GNUNET_malloc (htons (pkt->hdr.size) +
+ sizeof (struct answer_packet_list) -
+ sizeof (struct answer_packet));
- schedule_helper_write(GNUNET_TIME_UNIT_FOREVER_REL, NULL);
+ memcpy (&list->pkt, pkt, htons (pkt->hdr.size));
+ list->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_IP;
- return;
-}
+ GNUNET_HashCode key;
-/**
- * Sets a bit active in a bitArray.
- *
- * @param bitArray memory area to set the bit in
- * @param bitIdx which bit to set
- */
-void
-setBit (char *bitArray, unsigned int bitIdx)
-{
- size_t arraySlot;
- unsigned int targetBit;
+ memset (&key, 0, sizeof (GNUNET_HashCode));
- arraySlot = bitIdx / 8;
- targetBit = (1L << (bitIdx % 8));
- bitArray[arraySlot] |= targetBit;
-}
+ unsigned char *c = ((unsigned char *) &list->pkt) + ntohs (pkt->addroffset);
-/**
- * Clears a bit from bitArray.
- *
- * @param bitArray memory area to set the bit in
- * @param bitIdx which bit to unset
- */
-void
-clearBit (char *bitArray, unsigned int bitIdx)
-{
- size_t slot;
- unsigned int targetBit;
+ new_ip4addr_remote (c, list->pkt.addr, pkt->addrsize);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "New mapping to %d.%d.%d.%d\n", c[0],
+ c[1], c[2], c[3]);
+ unsigned char *k = (unsigned char *) &key;
- slot = bitIdx / 8;
- targetBit = (1L << (bitIdx % 8));
- bitArray[slot] = bitArray[slot] & (~targetBit);
-}
+ /*
+ * Copy the newly generated ip-address to the key backwards (as only the first part is used in the hash-table)
+ */
+ unsigned int i;
-/**
- * Checks if a bit is active in the bitArray
- *
- * @param bitArray memory area to set the bit in
- * @param bitIdx which bit to test
- * @return GNUNET_YES if the bit is set, GNUNET_NO if not.
- */
-int
-testBit (char *bitArray, unsigned int bitIdx)
-{
- size_t slot;
- unsigned int targetBit;
+ for (i = 0; i < 4; i++)
+ k[3 - i] = c[i];
+
+ uint16_t namelen = strlen ((char *) pkt->data + 12) + 1;
+
+ struct map_entry *value =
+ GNUNET_malloc (sizeof (struct map_entry) + namelen);
+ char *name = (char *) (value + 1);
+
+ value->namelen = namelen;
+ memcpy (name, pkt->data + 12, namelen);
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Setting addrlen to %d\n",
+ pkt->addrsize);
+ value->addrlen = pkt->addrsize;
+ memcpy (&value->addr, &pkt->addr, pkt->addrsize);
+ memset (value->additional_ports, 0, 8192);
+
+ memcpy (&value->hash, &key, sizeof (GNUNET_HashCode));
+
+ if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (hashmap, &key))
+ {
+ GNUNET_CONTAINER_multihashmap_put (hashmap, &key, value,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
+ value->heap_node =
+ GNUNET_CONTAINER_heap_insert (heap, value,
+ GNUNET_TIME_absolute_get ().abs_value);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Mapping is saved in the hashmap with key %08x.\n",
+ *((uint32_t *) (&key)));
+ if (GNUNET_CONTAINER_heap_get_size (heap) > max_mappings)
+ GNUNET_SCHEDULER_add_now (collect_mappings, NULL);
+ }
+ else
+ GNUNET_free (value);
- slot = bitIdx / 8;
- targetBit = (1L << (bitIdx % 8));
- if (bitArray[slot] & targetBit)
- return GNUNET_YES;
+ }
else
- return GNUNET_NO;
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ GNUNET_CONTAINER_DLL_insert_after (answer_proc_head, answer_proc_tail,
+ answer_proc_tail, list);
+
}
+
/**
* @brief Add the port to the list of additional ports in the map_entry
*
static void
add_additional_port (struct map_entry *me, uint16_t port)
{
- setBit(me->additional_ports, port);
+ setBit (me->additional_ports, port);
}
static int
-receive_udp_back (void *cls, struct GNUNET_MESH_Tunnel* tunnel,
- void **tunnel_ctx,
- const struct GNUNET_PeerIdentity *sender,
- const struct GNUNET_MessageHeader *message,
- const struct GNUNET_TRANSPORT_ATS_Information *atsi)
+receive_udp_back (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
+ void **tunnel_ctx, const struct GNUNET_PeerIdentity *sender,
+ const struct GNUNET_MessageHeader *message,
+ const struct GNUNET_ATS_Information *atsi GNUNET_UNUSED)
{
GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
+ struct remote_addr *s = (struct remote_addr *) desc;
struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
- const struct GNUNET_PeerIdentity* other = GNUNET_MESH_get_peer(tunnel);
+ const struct GNUNET_PeerIdentity *other = sender;
+ struct tunnel_state *ts = *tunnel_ctx;
- size_t size = sizeof(struct ip6_udp) + ntohs(pkt->len) - 1 - sizeof(struct udp_pkt);
+ if (16 == ts->addrlen)
+ {
+ size_t size =
+ sizeof (struct ip6_udp) + ntohs (pkt->len) - 1 -
+ sizeof (struct udp_pkt);
- struct ip6_udp* pkt6 = alloca(size);
+ struct ip6_udp *pkt6 = alloca (size);
- GNUNET_assert(pkt6 != NULL);
+ GNUNET_assert (pkt6 != NULL);
- new_ip6addr(pkt6->ip6_hdr.sadr, &other->hashPubKey, desc);
+ if (ntohs (message->type) == GNUNET_MESSAGE_TYPE_VPN_SERVICE_UDP_BACK)
+ new_ip6addr (&pkt6->ip6_hdr.sadr, &other->hashPubKey, desc);
+ else
+ new_ip6addr_remote (&pkt6->ip6_hdr.sadr, s->addr, s->addrlen);
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Relaying calc:%d gnu:%d udp:%d bytes!\n", size, ntohs(message->size), ntohs(pkt->len));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Relaying calc:%d gnu:%d udp:%d bytes!\n", size,
+ ntohs (message->size), ntohs (pkt->len));
- pkt6->shdr.type = htons(GNUNET_MESSAGE_TYPE_VPN_HELPER);
- pkt6->shdr.size = htons(size);
+ pkt6->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
+ pkt6->shdr.size = htons (size);
- pkt6->tun.flags = 0;
- pkt6->tun.type = htons(0x86dd);
+ pkt6->tun.flags = 0;
+ pkt6->tun.type = htons (0x86dd);
- pkt6->ip6_hdr.version = 6;
- pkt6->ip6_hdr.tclass_h = 0;
- pkt6->ip6_hdr.tclass_l = 0;
- pkt6->ip6_hdr.flowlbl = 0;
- pkt6->ip6_hdr.paylgth = pkt->len;
- pkt6->ip6_hdr.nxthdr = 0x11;
- pkt6->ip6_hdr.hoplmt = 0xff;
+ pkt6->ip6_hdr.version = 6;
+ pkt6->ip6_hdr.tclass_h = 0;
+ pkt6->ip6_hdr.tclass_l = 0;
+ pkt6->ip6_hdr.flowlbl = 0;
+ pkt6->ip6_hdr.paylgth = pkt->len;
+ pkt6->ip6_hdr.nxthdr = IPPROTO_UDP;
+ pkt6->ip6_hdr.hoplmt = 0xff;
- {
- char* ipv6addr;
- GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "vpn", "IPV6ADDR", &ipv6addr));
- inet_pton (AF_INET6, ipv6addr, pkt6->ip6_hdr.dadr);
- GNUNET_free(ipv6addr);
- }
- memcpy(&pkt6->udp_hdr, pkt, ntohs(pkt->len));
+ {
+ char *ipv6addr;
- GNUNET_HashCode* key = address_mapping_exists(pkt6->ip6_hdr.sadr);
- GNUNET_assert (key != NULL);
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn",
+ "IPV6ADDR",
+ &ipv6addr));
+ inet_pton (AF_INET6, ipv6addr, &pkt6->ip6_hdr.dadr);
+ GNUNET_free (ipv6addr);
+ }
+ memcpy (&pkt6->udp_hdr, pkt, ntohs (pkt->len));
- struct map_entry *me = GNUNET_CONTAINER_multihashmap_get(hashmap, key);
- GNUNET_CONTAINER_heap_update_cost (heap, me->heap_node,
- GNUNET_TIME_absolute_get ().abs_value);
+ GNUNET_HashCode *key = address6_mapping_exists (&pkt6->ip6_hdr.sadr);
- GNUNET_free(key);
+ GNUNET_assert (key != NULL);
- GNUNET_assert (me != NULL);
- GNUNET_assert (me->desc.service_type & htonl(GNUNET_DNS_SERVICE_TYPE_UDP));
- if (!port_in_ports(me->desc.ports, pkt6->udp_hdr.spt) &&
- !testBit(me->additional_ports, ntohs(pkt6->udp_hdr.spt))) {
- add_additional_port(me, ntohs(pkt6->udp_hdr.spt));
+ struct map_entry *me = GNUNET_CONTAINER_multihashmap_get (hashmap, key);
+
+ GNUNET_CONTAINER_heap_update_cost (heap, me->heap_node,
+ GNUNET_TIME_absolute_get ().abs_value);
+
+ GNUNET_free (key);
+
+ GNUNET_assert (me != NULL);
+ if (ntohs (message->type) == GNUNET_MESSAGE_TYPE_VPN_SERVICE_UDP_BACK)
+ {
+ GNUNET_assert (me->desc.
+ service_type & htonl (GNUNET_DNS_SERVICE_TYPE_UDP));
+ if (!port_in_ports (me->desc.ports, pkt6->udp_hdr.spt) &&
+ !testBit (me->additional_ports, ntohs (pkt6->udp_hdr.spt)))
+ {
+ add_additional_port (me, ntohs (pkt6->udp_hdr.spt));
+ }
+ }
+
+ pkt6->udp_hdr.crc = 0;
+ uint32_t sum = 0;
+
+ sum =
+ GNUNET_CRYPTO_crc16_step (sum, (uint16_t *) & pkt6->ip6_hdr.sadr, 16);
+ sum =
+ GNUNET_CRYPTO_crc16_step (sum, (uint16_t *) & pkt6->ip6_hdr.dadr, 16);
+ uint32_t tmp = (pkt6->udp_hdr.len & 0xffff);
+
+ sum = GNUNET_CRYPTO_crc16_step (sum, (uint16_t *) & tmp, 4);
+ tmp = htons (((pkt6->ip6_hdr.nxthdr & 0x00ff)));
+ sum = GNUNET_CRYPTO_crc16_step (sum, (uint16_t *) & tmp, 4);
+
+ sum =
+ GNUNET_CRYPTO_crc16_step (sum, (uint16_t *) & pkt6->udp_hdr,
+ ntohs (pkt->len));
+ pkt6->udp_hdr.crc = GNUNET_CRYPTO_crc16_finish (sum);
+
+ (void) GNUNET_HELPER_send (helper_handle,
+ &pkt6->shdr,
+ GNUNET_YES,
+ NULL, NULL);
}
+ else
+ {
+ size_t size =
+ sizeof (struct ip_udp) + ntohs (pkt->len) - 1 - sizeof (struct udp_pkt);
+
+ struct ip_udp *pkt4 = alloca (size);
+
+ GNUNET_assert (pkt4 != NULL);
+
+ GNUNET_assert (ntohs (message->type) ==
+ GNUNET_MESSAGE_TYPE_VPN_REMOTE_UDP_BACK);
+ uint32_t sadr;
+
+ new_ip4addr_remote ((unsigned char *) &sadr, s->addr, s->addrlen);
+ pkt4->ip_hdr.sadr.s_addr = sadr;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Relaying calc:%d gnu:%d udp:%d bytes!\n", size,
+ ntohs (message->size), ntohs (pkt->len));
+
+ pkt4->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
+ pkt4->shdr.size = htons (size);
+
+ pkt4->tun.flags = 0;
+ pkt4->tun.type = htons (0x0800);
+
+ pkt4->ip_hdr.version = 4;
+ pkt4->ip_hdr.hdr_lngth = 5;
+ pkt4->ip_hdr.diff_serv = 0;
+ pkt4->ip_hdr.tot_lngth = htons (20 + ntohs (pkt->len));
+ pkt4->ip_hdr.ident = 0;
+ pkt4->ip_hdr.flags = 0;
+ pkt4->ip_hdr.frag_off = 0;
+ pkt4->ip_hdr.ttl = 255;
+ pkt4->ip_hdr.proto = IPPROTO_UDP;
+ pkt4->ip_hdr.chks = 0; /* Will be calculated later */
- pkt6->udp_hdr.crc = 0;
- uint32_t sum = 0;
- sum = calculate_checksum_update(sum, (uint16_t*)&pkt6->ip6_hdr.sadr, 16);
- sum = calculate_checksum_update(sum, (uint16_t*)&pkt6->ip6_hdr.dadr, 16);
- uint32_t tmp = (pkt6->udp_hdr.len & 0xffff);
- sum = calculate_checksum_update(sum, (uint16_t*)&tmp, 4);
- tmp = htons(((pkt6->ip6_hdr.nxthdr & 0x00ff)));
- sum = calculate_checksum_update(sum, (uint16_t*)&tmp, 4);
+ {
+ char *ipv4addr;
+ uint32_t dadr;
- sum = calculate_checksum_update(sum, (uint16_t*)&pkt6->udp_hdr, ntohs(pkt->len));
- pkt6->udp_hdr.crc = calculate_checksum_end(sum);
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn",
+ "IPV4ADDR",
+ &ipv4addr));
+ inet_pton (AF_INET, ipv4addr, &dadr);
+ GNUNET_free (ipv4addr);
+ pkt4->ip_hdr.dadr.s_addr = dadr;
+ }
+ memcpy (&pkt4->udp_hdr, pkt, ntohs (pkt->len));
- write_to_helper(pkt6, size);
+ GNUNET_HashCode *key = address4_mapping_exists (pkt4->ip_hdr.sadr.s_addr);
+
+ GNUNET_assert (key != NULL);
+
+ struct map_entry *me = GNUNET_CONTAINER_multihashmap_get (hashmap, key);
+
+ GNUNET_CONTAINER_heap_update_cost (heap, me->heap_node,
+ GNUNET_TIME_absolute_get ().abs_value);
+
+ GNUNET_free (key);
+
+ GNUNET_assert (me != NULL);
+
+ pkt4->udp_hdr.crc = 0; /* Optional for IPv4 */
+
+ pkt4->ip_hdr.chks =
+ GNUNET_CRYPTO_crc16_n ((uint16_t *) & pkt4->ip_hdr, 5 * 4);
+
+ (void) GNUNET_HELPER_send (helper_handle,
+ &pkt4->shdr,
+ GNUNET_YES,
+ NULL, NULL);
+ }
return GNUNET_OK;
}
static int
-receive_tcp_back (void *cls, struct GNUNET_MESH_Tunnel* tunnel,
- void **tunnel_ctx,
- const struct GNUNET_PeerIdentity *sender,
- const struct GNUNET_MessageHeader *message,
- const struct GNUNET_TRANSPORT_ATS_Information *atsi)
+receive_tcp_back (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
+ void **tunnel_ctx,
+ const struct GNUNET_PeerIdentity *sender GNUNET_UNUSED,
+ const struct GNUNET_MessageHeader *message,
+ const struct GNUNET_ATS_Information *atsi GNUNET_UNUSED)
{
GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
+ struct remote_addr *s = (struct remote_addr *) desc;
struct tcp_pkt *pkt = (struct tcp_pkt *) (desc + 1);
- const struct GNUNET_PeerIdentity* other = GNUNET_MESH_get_peer(tunnel);
-
- size_t pktlen = ntohs(message->size) - sizeof(struct GNUNET_MessageHeader) - sizeof(GNUNET_HashCode);
- size_t size = pktlen + sizeof(struct ip6_tcp) - 1;
+ const struct GNUNET_PeerIdentity *other = sender;
+ struct tunnel_state *ts = *tunnel_ctx;
- struct ip6_tcp* pkt6 = alloca(size);
+ size_t pktlen =
+ ntohs (message->size) - sizeof (struct GNUNET_MessageHeader) -
+ sizeof (GNUNET_HashCode);
- GNUNET_assert(pkt6 != NULL);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received TCP-Packet back, addrlen = %d\n", s->addrlen);
- new_ip6addr(pkt6->ip6_hdr.sadr, &other->hashPubKey, desc);
+ if (ntohs (message->type) == GNUNET_MESSAGE_TYPE_VPN_SERVICE_TCP_BACK ||
+ ts->addrlen == 16)
+ {
+ size_t size = pktlen + sizeof (struct ip6_tcp) - 1;
- pkt6->shdr.type = htons(GNUNET_MESSAGE_TYPE_VPN_HELPER);
- pkt6->shdr.size = htons(size);
+ struct ip6_tcp *pkt6 = alloca (size);
- pkt6->tun.flags = 0;
- pkt6->tun.type = htons(0x86dd);
+ memset (pkt6, 0, size);
- pkt6->ip6_hdr.version = 6;
- pkt6->ip6_hdr.tclass_h = 0;
- pkt6->ip6_hdr.tclass_l = 0;
- pkt6->ip6_hdr.flowlbl = 0;
- pkt6->ip6_hdr.paylgth = htons(pktlen);
- pkt6->ip6_hdr.nxthdr = 0x06;
- pkt6->ip6_hdr.hoplmt = 0xff;
+ GNUNET_assert (pkt6 != NULL);
- {
- char* ipv6addr;
- GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "vpn", "IPV6ADDR", &ipv6addr));
- inet_pton (AF_INET6, ipv6addr, pkt6->ip6_hdr.dadr);
- GNUNET_free(ipv6addr);
+ if (ntohs (message->type) == GNUNET_MESSAGE_TYPE_VPN_SERVICE_TCP_BACK)
+ new_ip6addr (&pkt6->ip6_hdr.sadr, &other->hashPubKey, desc);
+ else
+ new_ip6addr_remote (&pkt6->ip6_hdr.sadr, s->addr, s->addrlen);
+
+ pkt6->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
+ pkt6->shdr.size = htons (size);
+
+ pkt6->tun.flags = 0;
+ pkt6->tun.type = htons (0x86dd);
+
+ pkt6->ip6_hdr.version = 6;
+ pkt6->ip6_hdr.tclass_h = 0;
+ pkt6->ip6_hdr.tclass_l = 0;
+ pkt6->ip6_hdr.flowlbl = 0;
+ pkt6->ip6_hdr.paylgth = htons (pktlen);
+ pkt6->ip6_hdr.nxthdr = IPPROTO_TCP;
+ pkt6->ip6_hdr.hoplmt = 0xff;
+
+ {
+ char *ipv6addr;
+
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn",
+ "IPV6ADDR",
+ &ipv6addr));
+ inet_pton (AF_INET6, ipv6addr, &pkt6->ip6_hdr.dadr);
+ GNUNET_free (ipv6addr);
+ }
+ memcpy (&pkt6->tcp_hdr, pkt, pktlen);
+
+ GNUNET_HashCode *key = address6_mapping_exists (&pkt6->ip6_hdr.sadr);
+
+ GNUNET_assert (key != NULL);
+
+ struct map_entry *me = GNUNET_CONTAINER_multihashmap_get (hashmap, key);
+
+ GNUNET_CONTAINER_heap_update_cost (heap, me->heap_node,
+ GNUNET_TIME_absolute_get ().abs_value);
+
+ GNUNET_free (key);
+
+ GNUNET_assert (me != NULL);
+ if (ntohs (message->type) == GNUNET_MESSAGE_TYPE_VPN_SERVICE_UDP_BACK)
+ GNUNET_assert (me->desc.
+ service_type & htonl (GNUNET_DNS_SERVICE_TYPE_TCP));
+
+ pkt6->tcp_hdr.crc = 0;
+ uint32_t sum = 0;
+ uint32_t tmp;
+
+ sum =
+ GNUNET_CRYPTO_crc16_step (sum, (uint16_t *) & pkt6->ip6_hdr.sadr, 16);
+ sum =
+ GNUNET_CRYPTO_crc16_step (sum, (uint16_t *) & pkt6->ip6_hdr.dadr, 16);
+ tmp = htonl (pktlen);
+ sum = GNUNET_CRYPTO_crc16_step (sum, (uint16_t *) & tmp, 4);
+ tmp = htonl (((pkt6->ip6_hdr.nxthdr & 0x000000ff)));
+ sum = GNUNET_CRYPTO_crc16_step (sum, (uint16_t *) & tmp, 4);
+
+ sum =
+ GNUNET_CRYPTO_crc16_step (sum, (uint16_t *) & pkt6->tcp_hdr,
+ ntohs (pkt6->ip6_hdr.paylgth));
+ pkt6->tcp_hdr.crc = GNUNET_CRYPTO_crc16_finish (sum);
+
+ (void) GNUNET_HELPER_send (helper_handle,
+ &pkt6->shdr,
+ GNUNET_YES,
+ NULL, NULL);
}
- memcpy(&pkt6->tcp_hdr, pkt, pktlen);
+ else
+ {
+ size_t size = pktlen + sizeof (struct ip_tcp) - 1;
+
+ struct ip_tcp *pkt4 = alloca (size);
+
+ GNUNET_assert (pkt4 != NULL);
+ memset (pkt4, 0, size);
+
+ GNUNET_assert (ntohs (message->type) ==
+ GNUNET_MESSAGE_TYPE_VPN_REMOTE_TCP_BACK);
+ uint32_t sadr;
+
+ new_ip4addr_remote ((unsigned char *) &sadr, s->addr, s->addrlen);
+ pkt4->ip_hdr.sadr.s_addr = sadr;
+
+ pkt4->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
+ pkt4->shdr.size = htons (size);
+
+ pkt4->tun.flags = 0;
+ pkt4->tun.type = htons (0x0800);
+
+ pkt4->ip_hdr.version = 4;
+ pkt4->ip_hdr.hdr_lngth = 5;
+ pkt4->ip_hdr.diff_serv = 0;
+ pkt4->ip_hdr.tot_lngth = htons (20 + pktlen);
+ pkt4->ip_hdr.ident = 0;
+ pkt4->ip_hdr.flags = 0;
+ pkt4->ip_hdr.frag_off = 0;
+ pkt4->ip_hdr.ttl = 255;
+ pkt4->ip_hdr.proto = IPPROTO_TCP;
+ pkt4->ip_hdr.chks = 0; /* Will be calculated later */
+
+ {
+ char *ipv4addr;
+ uint32_t dadr;
+
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn",
+ "IPV4ADDR",
+ &ipv4addr));
+ inet_pton (AF_INET, ipv4addr, &dadr);
+ GNUNET_free (ipv4addr);
+ pkt4->ip_hdr.dadr.s_addr = dadr;
+ }
+
+ memcpy (&pkt4->tcp_hdr, pkt, pktlen);
+
+ GNUNET_HashCode *key = address4_mapping_exists (pkt4->ip_hdr.sadr.s_addr);
+
+ GNUNET_assert (key != NULL);
+
+ struct map_entry *me = GNUNET_CONTAINER_multihashmap_get (hashmap, key);
+
+ GNUNET_CONTAINER_heap_update_cost (heap, me->heap_node,
+ GNUNET_TIME_absolute_get ().abs_value);
+
+ GNUNET_free (key);
- GNUNET_HashCode* key = address_mapping_exists(pkt6->ip6_hdr.sadr);
- GNUNET_assert (key != NULL);
+ GNUNET_assert (me != NULL);
+ pkt4->tcp_hdr.crc = 0;
+ uint32_t sum = 0;
+ uint32_t tmp;
- struct map_entry *me = GNUNET_CONTAINER_multihashmap_get(hashmap, key);
- GNUNET_CONTAINER_heap_update_cost (heap, me->heap_node,
- GNUNET_TIME_absolute_get ().abs_value);
+ sum = GNUNET_CRYPTO_crc16_step (sum, (uint16_t *) &pkt4->ip_hdr.sadr, 4);
+ sum = GNUNET_CRYPTO_crc16_step (sum, (uint16_t *) &pkt4->ip_hdr.dadr, 4);
- GNUNET_free(key);
+ tmp = (0x06 << 16) | (0xffff & pktlen); // 0x06 for TCP?
- GNUNET_assert (me != NULL);
- GNUNET_assert (me->desc.service_type & htonl(GNUNET_DNS_SERVICE_TYPE_TCP));
+ tmp = htonl (tmp);
- pkt6->tcp_hdr.crc = 0;
- uint32_t sum = 0;
- uint32_t tmp;
- sum =
- calculate_checksum_update (sum, (uint16_t *) & pkt6->ip6_hdr.sadr, 16);
- sum =
- calculate_checksum_update (sum, (uint16_t *) & pkt6->ip6_hdr.dadr, 16);
- tmp = htonl(pktlen);
- sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
- tmp = htonl (((pkt6->ip6_hdr.nxthdr & 0x000000ff)));
- sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
+ sum = GNUNET_CRYPTO_crc16_step (sum, (uint16_t *) & tmp, 4);
- sum =
- calculate_checksum_update (sum, (uint16_t *) & pkt6->tcp_hdr,
- ntohs (pkt6->ip6_hdr.paylgth));
- pkt6->tcp_hdr.crc = calculate_checksum_end (sum);
+ sum = GNUNET_CRYPTO_crc16_step (sum, (uint16_t *) & pkt4->tcp_hdr, pktlen);
+ pkt4->tcp_hdr.crc = GNUNET_CRYPTO_crc16_finish (sum);
- write_to_helper(pkt6, size);
+ pkt4->ip_hdr.chks =
+ GNUNET_CRYPTO_crc16_n ((uint16_t *) & pkt4->ip_hdr, 5 * 4);
+
+ (void) GNUNET_HELPER_send (helper_handle,
+ &pkt4->shdr,
+ GNUNET_YES,
+ NULL, NULL);
+
+ }
return GNUNET_OK;
}
+static void *
+new_tunnel (void *cls, struct GNUNET_MESH_Tunnel *tunnel,
+ const struct GNUNET_PeerIdentity *initiator,
+ const struct GNUNET_ATS_Information *atsi)
+{
+ /* Why should anyone open an inbound tunnel to vpn? */
+ GNUNET_break (0);
+ return NULL;
+}
+
+static void
+cleaner (void *cls, const struct GNUNET_MESH_Tunnel *tunnel, void *tunnel_ctx)
+{
+ /* Why should anyone open an inbound tunnel to vpn? */
+ GNUNET_break (0);
+}
+
/**
* Main function that will be run by the scheduler.
*
* @param cfg_ configuration
*/
static void
-run (void *cls,
- char *const *args,
- const char *cfgfile,
+run (void *cls, char *const *args GNUNET_UNUSED,
+ const char *cfgfile GNUNET_UNUSED,
const struct GNUNET_CONFIGURATION_Handle *cfg_)
{
- const static struct GNUNET_MESH_MessageHandler handlers[] = {
- {receive_udp_back, GNUNET_MESSAGE_TYPE_SERVICE_UDP_BACK, 0},
- {receive_tcp_back, GNUNET_MESSAGE_TYPE_SERVICE_TCP_BACK, 0},
- {NULL, 0, 0}
- };
- mesh_handle = GNUNET_MESH_connect(cfg_,
- NULL,
- NULL,
- handlers,
- NULL);
- cfg = cfg_;
- restart_hijack = 0;
- hashmap = GNUNET_CONTAINER_multihashmap_create(65536);
- heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
- GNUNET_CONFIGURATION_get_value_number (cfg, "vpn", "MAX_MAPPINGg",
- &max_mappings);
- udp_connections = GNUNET_CONTAINER_multihashmap_create(65536);
- GNUNET_SCHEDULER_TaskIdentifier conn_task = GNUNET_SCHEDULER_add_now (connect_to_service_dns, NULL);
- GNUNET_SCHEDULER_add_after (conn_task, start_helper_and_schedule, NULL);
- GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
+ static const struct GNUNET_MESH_MessageHandler handlers[] = {
+ {receive_udp_back, GNUNET_MESSAGE_TYPE_VPN_SERVICE_UDP_BACK, 0},
+ {receive_tcp_back, GNUNET_MESSAGE_TYPE_VPN_SERVICE_TCP_BACK, 0},
+ {receive_udp_back, GNUNET_MESSAGE_TYPE_VPN_REMOTE_UDP_BACK, 0},
+ {receive_tcp_back, GNUNET_MESSAGE_TYPE_VPN_REMOTE_TCP_BACK, 0},
+ {NULL, 0, 0}
+ };
+ static const GNUNET_MESH_ApplicationType types[] = {
+ GNUNET_APPLICATION_TYPE_END
+ };
+ char *ifname;
+ char *ipv6addr;
+ char *ipv6prefix;
+ char *ipv4addr;
+ char *ipv4mask;
+
+ mesh_handle =
+ GNUNET_MESH_connect (cfg_, 42, NULL, new_tunnel, cleaner, handlers,
+ types);
+ cfg = cfg_;
+ hashmap = GNUNET_CONTAINER_multihashmap_create (65536);
+ heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
+ GNUNET_CONFIGURATION_get_value_number (cfg, "vpn", "MAX_MAPPINGg",
+ &max_mappings);
+ udp_connections = GNUNET_CONTAINER_multihashmap_create (65536);
+ dns_handle = GNUNET_DNS_connect (cfg,
+ &process_answer,
+ NULL);
+ if (GNUNET_SYSERR ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IFNAME", &ifname))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "No entry 'IFNAME' in configuration!\n");
+ exit (1);
+ }
+
+ if (GNUNET_SYSERR ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV6ADDR", &ipv6addr))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "No entry 'IPV6ADDR' in configuration!\n");
+ exit (1);
+ }
+
+ if (GNUNET_SYSERR ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV6PREFIX",
+ &ipv6prefix))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "No entry 'IPV6PREFIX' in configuration!\n");
+ exit (1);
+ }
+
+ if (GNUNET_SYSERR ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV4ADDR", &ipv4addr))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "No entry 'IPV4ADDR' in configuration!\n");
+ exit (1);
+ }
+
+ if (GNUNET_SYSERR ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV4MASK", &ipv4mask))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "No entry 'IPV4MASK' in configuration!\n");
+ exit (1);
+ }
+
+ vpn_argv[0] = GNUNET_strdup ("vpn-gnunet");
+ vpn_argv[1] = ifname;
+ vpn_argv[2] = ipv6addr;
+ vpn_argv[3] = ipv6prefix;
+ vpn_argv[4] = ipv4addr;
+ vpn_argv[5] = ipv4mask;
+ vpn_argv[6] = NULL;
+
+ helper_handle = GNUNET_HELPER_start ("gnunet-helper-vpn", vpn_argv,
+ &message_token, NULL);
+ GNUNET_DNS_restart_hijack (dns_handle);
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
}
/**
* @return 0 ok, 1 on error
*/
int
-main (int argc, char *const *argv) {
- static const struct GNUNET_GETOPT_CommandLineOption options[] = {
- GNUNET_GETOPT_OPTION_END
- };
-
- return (GNUNET_OK ==
- GNUNET_PROGRAM_run (argc,
- argv,
- "gnunet-daemon-vpn",
- gettext_noop ("help text"),
- options, &run, NULL)) ? ret : 1;
+main (int argc, char *const *argv)
+{
+ static const struct GNUNET_GETOPT_CommandLineOption options[] = {
+ GNUNET_GETOPT_OPTION_END
+ };
+
+ return (GNUNET_OK ==
+ GNUNET_PROGRAM_run (argc, argv, "vpn", gettext_noop ("help text"),
+ options, &run, NULL)) ? ret : 1;
}
/* end of gnunet-daemon-vpn.c */
-
projects / oweals / gnunet.git / blobdiff