/**
* @file vpn/gnunet-daemon-vpn.c
- * @brief
- * @author Philipp Tรถlke
+ * @brief
+ * @author Philipp Toelke
*/
#include "platform.h"
#include "gnunet_getopt_lib.h"
#include "gnunet_program_lib.h"
-#include "gnunet_os_lib.h"
-#include "gnunet-vpn-helper-p.h"
#include "gnunet-vpn-packet.h"
-#include "gnunet-vpn-pretty-print.h"
#include "gnunet_common.h"
#include "gnunet_protocols.h"
-#include "gnunet_server_lib.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;
+static struct GNUNET_CONTAINER_Heap *heap;
+
+/**
+ * If there are at least this many address-mappings, old ones will be removed
+ */
+static long long unsigned int max_mappings = 200;
/**
* Final status code.
*/
static int ret;
-struct vpn_cls {
- struct GNUNET_DISK_PipeHandle* helper_in; // From the helper
- struct GNUNET_DISK_PipeHandle* helper_out; // To the helper
- const struct GNUNET_DISK_FileHandle* fh_from_helper;
+/**
+ * This hashmap contains the mapping from peer, service-descriptor,
+ * source-port and destination-port to a socket
+ */
+static struct GNUNET_CONTAINER_MultiHashMap *udp_connections;
+
+/**
+ * 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));
+
+ /* 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;
+ }
+
+ if (mesh_handle != NULL)
+ {
+ GNUNET_MESH_disconnect(mesh_handle);
+ mesh_handle = NULL;
+ }
+}
+/*}}}*/
- struct GNUNET_SERVER_MessageStreamTokenizer* mst;
+/**
+ * @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];
+
+ if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains(hashmap, key))
+ return key;
+ else
+ {
+ GNUNET_free(key);
+ return NULL;
+ }
+}
- struct GNUNET_SCHEDULER_Handle *sched;
+static void
+collect_mappings(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tc) {
+ if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
+ return;
- pid_t helper_pid;
-};
+ struct map_entry* me = GNUNET_CONTAINER_heap_remove_root(heap);
-static void cleanup(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
- struct vpn_cls* mycls = (struct vpn_cls*) cls;
- if (tskctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) {
- PLIBC_KILL(mycls->helper_pid, SIGTERM);
- GNUNET_OS_process_wait(mycls->helper_pid);
- }
+ /* This is free()ed memory! */
+ me->heap_node = NULL;
+
+ /* FIXME! GNUNET_MESH_close_tunnel(state->tunnel); */
+
+ GNUNET_CONTAINER_multihashmap_remove(hashmap, &me->hash, me);
+
+ GNUNET_free(me);
}
-static void helper_read(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx);
+void
+send_icmp_response(void* cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
+ struct ip6_icmp* request = cls;
-static void start_helper_and_schedule(struct vpn_cls* mycls) {
- mycls->helper_in = GNUNET_DISK_pipe(1);
- mycls->helper_out = GNUNET_DISK_pipe(1);
+ struct ip6_icmp* response = alloca(ntohs(request->shdr.size));
+ GNUNET_assert(response != NULL);
+ memset(response, 0, ntohs(request->shdr.size));
- mycls->helper_pid = GNUNET_OS_start_process(mycls->helper_in, mycls->helper_out, "gnunet-helper-vpn", "gnunet-helper-vpn", NULL);
+ response->shdr.size = request->shdr.size;
+ response->shdr.type = htons(GNUNET_MESSAGE_TYPE_VPN_HELPER);
- mycls->fh_from_helper = GNUNET_DISK_pipe_handle (mycls->helper_out, GNUNET_DISK_PIPE_END_READ);
+ response->tun.flags = 0;
+ response->tun.type = htons(0x86dd);
- GNUNET_DISK_pipe_close_end(mycls->helper_out, GNUNET_DISK_PIPE_END_WRITE);
- GNUNET_DISK_pipe_close_end(mycls->helper_in, GNUNET_DISK_PIPE_END_READ);
+ 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_SCHEDULER_add_read_file (mycls->sched, GNUNET_TIME_UNIT_FOREVER_REL, mycls->fh_from_helper, &helper_read, mycls);
-}
+ response->icmp_hdr.code = 0;
+ response->icmp_hdr.type = 0x81;
+ /* Magic, more Magic! */
+ response->icmp_hdr.chks = request->icmp_hdr.chks - 0x1;
-static void restart_helper(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
- // FIXME: Ratelimit this!
- struct vpn_cls* mycls = (struct vpn_cls*) cls;
+ /* Copy the rest of the packet */
+ memcpy(response+1, request+1, ntohs(request->shdr.size) - sizeof(struct ip6_icmp));
- // Kill the helper
- PLIBC_KILL(mycls->helper_pid, SIGKILL);
- GNUNET_OS_process_wait(mycls->helper_pid);
+ write_to_helper(response, ntohs(response->shdr.size));
- // Restart the helper
- start_helper_and_schedule(mycls);
+ 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 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_free (cls);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sent!\n");
+ return size;
}
-static void helper_read(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx) {
- struct vpn_cls* mycls = (struct vpn_cls*) cls;
- char buf[65535];
+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;
+}
- if (tsdkctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
- return;
+void
+send_pkt_to_peer (void *cls,
+ const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_TRANSPORT_ATS_Information *atsi)
+{
+ 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);
+}
- int t = GNUNET_DISK_file_read(mycls->fh_from_helper, &buf, 65535);
- if (t<=0) {
- fprintf(stderr, "Read error for header: %m\n");
- GNUNET_SCHEDULER_add_now(mycls->sched, restart_helper, cls);
- return;
- }
+/**
+ * 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);
+}
+/*}}}*/
- /* FIXME */ GNUNET_SERVER_mst_receive(mycls->mst, NULL, buf, t, 0, 0);
+char
+max (char a, char b)
+{
+ return a > b ? a : b;
+}
- GNUNET_SCHEDULER_add_read_file (mycls->sched, GNUNET_TIME_UNIT_FOREVER_REL, mycls->fh_from_helper, &helper_read, mycls);
+/**
+ * Create a new Address from an answer-packet
+ */
+void
+new_ip6addr_remote (unsigned char *buf, unsigned char *addr, char addrlen)
+{ /* {{{ */
+ 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, max (addrlen, local_length));
}
+/*}}}*/
-static void message_token(void *cls, void *client, const struct GNUNET_MessageHeader *message) {
- if (ntohs(message->type) != GNUNET_MESSAGE_TYPE_VPN_HELPER) return;
+/**
+ * This gets scheduled with cls pointing to an answer_packet and does everything
+ * needed in order to send it to the helper.
+ *
+ * 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
+ */
+ if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_SERVICE)
+ {
+ pkt->subtype = GNUNET_DNS_ANSWER_TYPE_IP;
+
+ GNUNET_HashCode key;
+ memset(&key, 0, sizeof(GNUNET_HashCode));
+
+ 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;
+
+ 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);
+
+ memcpy(&value->desc, &pkt->service_descr, sizeof(struct GNUNET_vpn_service_descriptor));
+
+ 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_free(value);
+
+
+ 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;
+ 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));
+
+ }
+ 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;
+
+ GNUNET_HashCode key;
+ memset(&key, 0, sizeof(GNUNET_HashCode));
+
+ 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;
+
+ 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->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_free(value);
+
+ list = GNUNET_malloc(htons(pkt->hdr.size) + 2*sizeof(struct answer_packet_list*));
+
+ memcpy(&list->pkt, pkt, htons(pkt->hdr.size));
+ }
+ else
+ {
+ GNUNET_break(0);
+ GNUNET_free(pkt);
+ return;
+ }
+
+ GNUNET_free(pkt);
+
+ GNUNET_CONTAINER_DLL_insert_after(answer_proc_head, answer_proc_tail, answer_proc_tail, list);
+
+ schedule_helper_write(GNUNET_TIME_UNIT_FOREVER_REL, NULL);
+
+ return;
+}
- struct tun_pkt *pkt_tun = (struct tun_pkt*) message;
+/**
+ * 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;
- fprintf(stderr, "Packet, Type: %x\n", ntohs(pkt_tun->tun.type));
+ arraySlot = bitIdx / 8;
+ targetBit = (1L << (bitIdx % 8));
+ bitArray[arraySlot] |= targetBit;
+}
- if (ntohs(pkt_tun->tun.type) == 0x86dd) {
- struct ip6_pkt *pkt6 = (struct ip6_pkt*) message;
- struct ip6_tcp *pkt6_tcp;
- struct ip6_udp *pkt6_udp;
+/**
+ * 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;
- pkt_printf(pkt6);
- switch(pkt6->ip6_hdr.nxthdr) {
- case 0x06:
- pkt6_tcp = (struct ip6_tcp*)pkt6;
- pkt_printf_ip6tcp(pkt6_tcp);
- break;
- case 0x11:
- pkt6_udp = (struct ip6_udp*)pkt6;
- pkt_printf_ip6udp(pkt6_udp);
- if (ntohs(pkt6_udp->udp_hdr.dpt) == 53) {
- pkt_printf_ip6dns((struct ip6_udp_dns*)pkt6_udp);
- }
- break;
- }
- } else if (ntohs(pkt_tun->tun.type) == 0x0800) {
- struct ip_pkt *pkt = (struct ip_pkt*) message;
- struct ip_udp *udp = (struct ip_udp*) message;
- fprintf(stderr, "IPv4\n");
- if (pkt->ip_hdr.proto == 0x11 && ntohl(udp->ip_hdr.dadr) == 0x0a0a0a02 && ntohs(udp->udp_hdr.dpt) == 53 ) {
- pkt_printf_ipdns((struct ip_udp_dns*)udp);
- }
- }
+ slot = bitIdx / 8;
+ targetBit = (1L << (bitIdx % 8));
+ bitArray[slot] = bitArray[slot] & (~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.
+ */
+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;
}
/**
- * Main function that will be run by the scheduler.
+ * @brief Add the port to the list of additional ports in the map_entry
*
- * @param cls closure
- * @param sched the scheduler to use
- * @param args remaining command-line arguments
- * @param cfgfile name of the configuration file used (for saving, can be NULL!)
- * @param cfg configuration
+ * @param me the map_entry
+ * @param port the port in host-byte-order
*/
static void
-run (void *cls,
- struct GNUNET_SCHEDULER_Handle *sched,
- char *const *args,
- const char *cfgfile,
- const struct GNUNET_CONFIGURATION_Handle *cfg) {
+add_additional_port (struct map_entry *me, uint16_t 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)
+{
+ GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
+ struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
+ const struct GNUNET_PeerIdentity* other = GNUNET_MESH_get_peer(tunnel);
+
+ 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);
+
+ new_ip6addr(pkt6->ip6_hdr.sadr, &other->hashPubKey, desc);
+
+ 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 = 0x11;
+ 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 = address_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);
+ 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 = 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);
+
+ sum = calculate_checksum_update(sum, (uint16_t*)&pkt6->udp_hdr, ntohs(pkt->len));
+ pkt6->udp_hdr.crc = calculate_checksum_end(sum);
+
+ write_to_helper(pkt6, size);
+
+ 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)
+{
+ GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
+ struct tcp_pkt *pkt = (struct tcp_pkt *) (desc + 1);
+ const struct GNUNET_PeerIdentity* other = GNUNET_MESH_get_peer(tunnel);
- struct vpn_cls* mycls = (struct vpn_cls*) cls;
+ size_t pktlen = ntohs(message->size) - sizeof(struct GNUNET_MessageHeader) - sizeof(GNUNET_HashCode);
+ size_t size = pktlen + sizeof(struct ip6_tcp) - 1;
- mycls->sched = sched;
+ struct ip6_tcp* pkt6 = alloca(size);
- mycls->mst = GNUNET_SERVER_mst_create(&message_token, mycls);
+ GNUNET_assert(pkt6 != NULL);
- GNUNET_SCHEDULER_add_delayed(sched, GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
+ new_ip6addr(pkt6->ip6_hdr.sadr, &other->hashPubKey, desc);
- start_helper_and_schedule(mycls);
+ 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 = 0x06;
+ 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 = address_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);
+ 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 =
+ 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 =
+ calculate_checksum_update (sum, (uint16_t *) & pkt6->tcp_hdr,
+ ntohs (pkt6->ip6_hdr.paylgth));
+ pkt6->tcp_hdr.crc = calculate_checksum_end (sum);
+
+ write_to_helper(pkt6, size);
+
+ return GNUNET_OK;
}
+/**
+ * Main function that will be run by the scheduler.
+ *
+ * @param cls closure
+ * @param args remaining command-line arguments
+ * @param cfgfile name of the configuration file used (for saving, can be NULL!)
+ * @param cfg_ configuration
+ */
+static void
+run (void *cls,
+ char *const *args,
+ const char *cfgfile,
+ 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);
+}
/**
* The main function to obtain template from gnunetd.
* @return 0 ok, 1 on error
*/
int
-main (int argc, char *const *argv)
-{
- static const struct GNUNET_GETOPT_CommandLineOption options[] = {
- GNUNET_GETOPT_OPTION_END
- };
-
- struct vpn_cls* cls = GNUNET_malloc(sizeof(struct vpn_cls));
-
- return (GNUNET_OK ==
- GNUNET_PROGRAM_run (argc,
- argv,
- "gnunet-daemon-vpn",
- gettext_noop ("help text"),
- options, &run, cls)) ? ret : 1;
-
- GNUNET_free(cls); // Make clang happy
+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;
}
/* end of gnunet-daemon-vpn.c */
+
projects / oweals / gnunet.git / blobdiff