--- /dev/null
+/*
+ This file is part of GNUnet.
+ (C) 2010, 2011, 2012 Christian Grothoff
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file vpn/gnunet-service-vpn.c
+ * @brief service that opens a virtual interface and allows its clients
+ * to allocate IPs on the virtual interface and to then redirect
+ * IP traffic received on those IPs via the GNUnet mesh
+ * @author Philipp Toelke
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet-vpn-packet.h"
+#include "gnunet_common.h"
+#include "gnunet_protocols.h"
+#include "gnunet_applications.h"
+#include "gnunet_mesh_service.h"
+#include "gnunet_constants.h"
+
+
+
+struct map_entry
+{
+ /** The description of the service (used for service) */
+ GNUNET_HashCode 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;
+
+};
+
+
+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;
+};
+
+
+
+/**
+ * Configuration we use.
+ */
+static const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+/**
+ * Handle to the mesh service.
+ */
+static struct GNUNET_MESH_Handle *mesh_handle;
+
+/**
+ * FIXME
+ */
+static struct GNUNET_CONTAINER_MultiHashMap *hashmap;
+
+/**
+ * FIXME
+ */
+static struct GNUNET_CONTAINER_Heap *heap;
+
+/**
+ * The handle to the VPN helper process "gnunet-helper-vpn".
+ */
+static struct GNUNET_HELPER_Handle *helper_handle;
+
+/**
+ * Arguments to the exit helper.
+ */
+static char *vpn_argv[7];
+
+/**
+ * If there are at least this many address-mappings, old ones will be removed
+ */
+static unsigned long long max_mappings;
+
+
+/**
+ * @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;
+
+ 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
+ */
+static GNUNET_HashCode *
+address4_mapping_exists (uint32_t addr)
+{
+ GNUNET_HashCode *key = GNUNET_malloc (sizeof (GNUNET_HashCode));
+
+ 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
+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 ip_icmp *response = alloca (ntohs (request->shdr.size));
+
+ GNUNET_assert (response != NULL);
+ memset (response, 0, ntohs (request->shdr.size));
+
+ response->shdr.size = request->shdr.size;
+ response->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
+
+ response->tun.flags = 0;
+ response->tun.type = htons (0x0800);
+
+ 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);
+}
+
+
+static void
+send_icmp6_response (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
+ return;
+
+ 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));
+
+ response->shdr.size = request->shdr.size;
+ response->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
+
+ response->tun.flags = 0;
+ response->tun.type = htons (0x86dd);
+
+ 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);
+
+ response->icmp_hdr.code = 0;
+ response->icmp_hdr.type = 0x81;
+
+ /* 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;
+ */
+static size_t
+send_pkt_to_peer_notify_callback (void *cls, size_t size, void *buf)
+{
+ struct GNUNET_MESH_Tunnel **tunnel = cls;
+
+ 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);
+
+ return size;
+}
+
+
+static void
+send_pkt_to_peer (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_ATS_Information *atsi GNUNET_UNUSED)
+{
+ /* 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);
+
+ 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 */
+ /* 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 */
+ *hc = me->desc;
+
+ 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);
+ me->tunnel = *cls;
+ }
+ else if (NULL != cls)
+ {
+ *cls = me->tunnel;
+ send_pkt_to_peer (cls, (struct GNUNET_PeerIdentity *) 1, NULL);
+ }
+ }
+ 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;
+ }
+ 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;
+ }
+ 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;
+ }
+ 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);
+
+ {
+ 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 */
+ *hc = me->desc;
+
+ 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);
+ me->tunnel = *cls;
+ }
+ else if (NULL != cls)
+ {
+ *cls = me->tunnel;
+ send_pkt_to_peer (cls, (struct GNUNET_PeerIdentity *) 1, NULL);
+ }
+ }
+ 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;
+ }
+ }
+ }
+}
+
+
+
+
+
+/**
+ * Create a new Address from an answer-packet
+ */
+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
+ */
+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",
+ &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 local_length = 16 - ipv6prefix;
+
+ 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));
+}
+
+/*}}}*/
+
+
+
+/**
+ * FIXME: document.
+ */
+static int
+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 = sender;
+ struct tunnel_state *ts = *tunnel_ctx;
+
+ 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);
+
+ GNUNET_assert (pkt6 != NULL);
+
+ 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));
+
+ 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 = 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));
+
+ 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);
+
+ 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 */
+
+ {
+ 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->udp_hdr, pkt, ntohs (pkt->len));
+
+ 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;
+}
+
+
+/**
+ * FIXME: document.
+ */
+static int
+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 = sender;
+ struct tunnel_state *ts = *tunnel_ctx;
+
+ size_t pktlen =
+ ntohs (message->size) - sizeof (struct GNUNET_MessageHeader) -
+ sizeof (GNUNET_HashCode);
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received TCP-Packet back, addrlen = %d\n", s->addrlen);
+
+ if (ntohs (message->type) == GNUNET_MESSAGE_TYPE_VPN_SERVICE_TCP_BACK ||
+ ts->addrlen == 16)
+ {
+ size_t size = pktlen + sizeof (struct ip6_tcp) - 1;
+
+ struct ip6_tcp *pkt6 = alloca (size);
+
+ memset (pkt6, 0, size);
+
+ GNUNET_assert (pkt6 != NULL);
+
+ 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);
+
+ 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);
+ }
+ 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_assert (me != NULL);
+ pkt4->tcp_hdr.crc = 0;
+ uint32_t sum = 0;
+ uint32_t tmp;
+
+ 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);
+
+ tmp = (0x06 << 16) | (0xffff & pktlen); // 0x06 for TCP?
+
+ tmp = htonl (tmp);
+
+ sum = GNUNET_CRYPTO_crc16_step (sum, (uint16_t *) & tmp, 4);
+
+ sum = GNUNET_CRYPTO_crc16_step (sum, (uint16_t *) & pkt4->tcp_hdr, pktlen);
+ pkt4->tcp_hdr.crc = GNUNET_CRYPTO_crc16_finish (sum);
+
+ 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;
+}
+
+
+/**
+ * FIXME: document.
+ */
+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;
+}
+
+
+/**
+ * FIXME: document.
+ */
+static void
+tunnel_cleaner (void *cls, const struct GNUNET_MESH_Tunnel *tunnel, void *tunnel_ctx)
+{
+ /* Why should anyone open an inbound tunnel to vpn? */
+ /* FIXME: is this not also called for outbound tunnels that go down!? */
+ GNUNET_break (0);
+}
+
+
+/**
+ * Function scheduled as very last function, cleans up after us
+ */
+static void
+cleanup (void *cls GNUNET_UNUSED,
+ const struct GNUNET_SCHEDULER_TaskContext *tskctx)
+{
+ unsigned int i;
+
+ if (mesh_handle != NULL)
+ {
+ GNUNET_MESH_disconnect (mesh_handle);
+ mesh_handle = NULL;
+ }
+ if (helper_handle != NULL)
+ {
+ GNUNET_HELPER_stop (helper_handle);
+ helper_handle = NULL;
+ }
+ for (i=0;i<5;i++)
+ GNUNET_free_non_null (vpn_argv[i]);
+}
+
+
+/**
+ * Main function that will be run by the scheduler.
+ *
+ * @param cls closure
+ * @param server the initialized server
+ * @param cfg_ configuration
+ */
+static void
+run (void *cls,
+ struct GNUNET_SERVER_Handle *server,
+ const struct GNUNET_CONFIGURATION_Handle *cfg_)
+{
+ 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_s;
+ char *ipv4addr;
+ char *ipv4mask;
+ struct in_addr v4;
+ struct in6_addr v6;
+ unsigned long long ipv6prefix;
+
+ cfg = cfg_;
+ hashmap = GNUNET_CONTAINER_multihashmap_create (65536);
+ heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (cfg, "vpn", "MAX_MAPPING",
+ &max_mappings))
+ max_mappings = 200;
+
+ vpn_argv[0] = GNUNET_strdup ("vpn-gnunet");
+ if (GNUNET_SYSERR ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IFNAME", &ifname))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "No entry 'IFNAME' in configuration!\n");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ vpn_argv[1] = ifname;
+ if ( (GNUNET_SYSERR ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV6ADDR",
+ &ipv6addr) ||
+ (1 != inet_pton (AF_INET6, ipv6addr, &v6))) )
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "No valid entry 'IPV6ADDR' in configuration!\n");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ vpn_argv[2] = ipv6addr;
+ if (GNUNET_SYSERR ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV6PREFIX",
+ &ipv6prefix_s))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "No entry 'IPV6PREFIX' in configuration!\n");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ vpn_argv[3] = ipv6prefix_s;
+ if ( (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (cfg, "vpn",
+ "IPV6PREFIX",
+ &ipv6prefix)) ||
+ (ipv6prefix >= 127) )
+ {
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+
+ if ( (GNUNET_SYSERR ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV4ADDR",
+ &ipv4addr) ||
+ (1 != inet_pton (AF_INET, ipv4addr, &v4))) )
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "No valid entry for 'IPV4ADDR' in configuration!\n");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ vpn_argv[4] = ipv4addr;
+ if ( (GNUNET_SYSERR ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV4MASK",
+ &ipv4mask) ||
+ (1 != inet_pton (AF_INET, ipv4mask, &v4))) )
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "No valid entry 'IPV4MASK' in configuration!\n");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ vpn_argv[5] = ipv4mask;
+ vpn_argv[6] = NULL;
+
+ mesh_handle =
+ GNUNET_MESH_connect (cfg_, 42 /* queue length */, NULL,
+ &new_tunnel,
+ &tunnel_cleaner,
+ handlers,
+ types);
+ helper_handle = GNUNET_HELPER_start ("gnunet-helper-vpn", vpn_argv,
+ &message_token, NULL);
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
+}
+
+
+/**
+ * The main function of the VPN service.
+ *
+ * @param argc number of arguments from the command line
+ * @param argv command line arguments
+ * @return 0 ok, 1 on error
+ */
+int
+main (int argc, char *const *argv)
+{
+ return (GNUNET_OK ==
+ GNUNET_SERVICE_run (argc, argv, "vpn",
+ GNUNET_SERVICE_OPTION_NONE,
+ &run, NULL)) ? 0 : 1;
+}
+
+/* end of gnunet-service-vpn.c */
projects / oweals / gnunet.git / commitdiff