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- /*
- This file is part of GNUnet.
- (C) 2010 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-daemon-vpn.c
- * @brief
- * @author Philipp Toelke
- */
- #include "platform.h"
- #include "gnunet_getopt_lib.h"
- #include "gnunet_program_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_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;
- struct tunnel_notify_queue
- {
- struct tunnel_notify_queue* next;
- struct tunnel_notify_queue* prev;
- size_t len;
- void* cls;
- };
- /**
- * 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;
- /**
- * This hashmap contains the mapping from peer, service-descriptor,
- * source-port and destination-port to a socket
- */
- static struct GNUNET_CONTAINER_MultiHashMap *udp_connections;
- GNUNET_SCHEDULER_TaskIdentifier conn_task;
- GNUNET_SCHEDULER_TaskIdentifier shs_task;
- /**
- * Function scheduled as very last function, cleans up after us
- *{{{
- */
- static void
- cleanup(void* cls __attribute__((unused)), 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;
- }
- 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;
- }
- }
- /*}}}*/
- /**
- * @return the hash of the IP-Address if a mapping exists, NULL otherwise
- */
- GNUNET_HashCode*
- address6_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;
- }
- }
- /**
- * @return the hash of the IP-Address if a mapping exists, NULL otherwise
- */
- 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
- collect_mappings(void* cls __attribute__((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_CONTAINER_multihashmap_remove(hashmap, &me->hash, me);
- GNUNET_free(me);
- }
- 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 = calculate_ip_checksum((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));
- write_to_helper(response, ntohs(response->shdr.size));
- GNUNET_free(request);
- }
- 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));
- write_to_helper(response, ntohs(response->shdr.size));
- 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;
- GNUNET_MESH_tunnel_set_data(*tunnel, NULL);
- 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");
- if (NULL != GNUNET_MESH_tunnel_get_head(*tunnel))
- {
- struct tunnel_notify_queue* element = GNUNET_MESH_tunnel_get_head(*tunnel);
- struct tunnel_notify_queue* head = GNUNET_MESH_tunnel_get_head(*tunnel);
- struct tunnel_notify_queue* tail = GNUNET_MESH_tunnel_get_tail(*tunnel);
- GNUNET_CONTAINER_DLL_remove(head, tail, element);
- GNUNET_MESH_tunnel_set_head(*tunnel, head);
- GNUNET_MESH_tunnel_set_tail(*tunnel, tail);
- struct GNUNET_MESH_TransmitHandle* 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_MESH_tunnel_set_data(*tunnel, th);
- GNUNET_free(element);
- }
- GNUNET_free (cls);
- 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 __attribute__((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);
- if (NULL == GNUNET_MESH_tunnel_get_data(*tunnel))
- {
- struct GNUNET_MESH_TransmitHandle* 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);
- GNUNET_MESH_tunnel_set_data(*tunnel, th);
- }
- else
- {
- struct tunnel_notify_queue* head = GNUNET_MESH_tunnel_get_head(*tunnel);
- struct tunnel_notify_queue* tail = GNUNET_MESH_tunnel_get_tail(*tunnel);
- struct tunnel_notify_queue* element = GNUNET_malloc(sizeof *element);
- element->cls = cls;
- element->len = ntohs(hdr->size);
- GNUNET_CONTAINER_DLL_insert_tail(head, tail, element);
- GNUNET_MESH_tunnel_set_head(*tunnel, head);
- GNUNET_MESH_tunnel_set_tail(*tunnel, tail);
- }
- }
- /**
- * 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);
- }
- /*}}}*/
- /**
- * 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, GNUNET_MIN (addrlen, local_length));
- }
- /*}}}*/
- /**
- * Create a new Address from an answer-packet
- */
- 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));
- }
- /*}}}*/
- /**
- * 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) {
- if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
- return;
- 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);
- uint16_t offset = ntohs(pkt->addroffset);
- if (map_entry == NULL)
- {
- GNUNET_free(pkt);
- return;
- }
- GNUNET_CONTAINER_heap_update_cost (heap, map_entry->heap_node,
- GNUNET_TIME_absolute_get ().abs_value);
- 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_AAAA)
- {
- 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);
- 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_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_REMOTE_A)
- {
- 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_ip4addr_remote(c, 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;
- /*
- * 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 < 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);
- 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;
- }
- /**
- * 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;
- arraySlot = bitIdx / 8;
- targetBit = (1L << (bitIdx % 8));
- bitArray[arraySlot] |= targetBit;
- }
- /**
- * 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;
- 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;
- }
- /**
- * @brief Add the port to the list of additional ports in the map_entry
- *
- * @param me the map_entry
- * @param port the port in host-byte-order
- */
- static void
- add_additional_port (struct map_entry *me, uint16_t port)
- {
- setBit(me->additional_ports, port);
- }
- static int
- receive_udp_back (void *cls
- __attribute__ ((unused)), struct GNUNET_MESH_Tunnel *tunnel,
- void **tunnel_ctx __attribute__ ((unused)),
- const struct GNUNET_PeerIdentity *sender __attribute__ ((unused)),
- const struct GNUNET_MessageHeader *message,
- const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__ ((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);
- if (16 == s->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_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 = 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 = 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_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 =
- 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);
- }
- 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_REMOTE_UDP_BACK);
- uint32_t sadr;
- new_ip4addr_remote ((unsigned char*)&sadr, s->addr, s->addrlen);
- pkt4->ip_hdr.sadr = 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 = 0x11;
- 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 = dadr;
- }
- memcpy (&pkt4->udp_hdr, pkt, ntohs (pkt->len));
- GNUNET_HashCode *key = address4_mapping_exists (pkt4->ip_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);
- pkt4->udp_hdr.crc = 0; /* Optional for IPv4 */
- pkt4->ip_hdr.chks =
- calculate_ip_checksum ((uint16_t *) & pkt4->ip_hdr, 5 * 4);
- write_to_helper (pkt4, size);
- }
- return GNUNET_OK;
- }
- static int
- receive_tcp_back (void *cls __attribute__((unused)), struct GNUNET_MESH_Tunnel* tunnel,
- void **tunnel_ctx __attribute__((unused)),
- const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
- const struct GNUNET_MessageHeader *message,
- const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((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);
- if (s->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_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 = 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 = 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_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 =
- 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);
- }
- 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_REMOTE_TCP_BACK);
- uint32_t sadr;
- new_ip4addr_remote ((unsigned char*)&sadr, s->addr, s->addrlen);
- pkt4->ip_hdr.sadr = 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 = 0x06;
- 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 = dadr;
- }
- memcpy (&pkt4->tcp_hdr, pkt, pktlen);
- GNUNET_HashCode *key = address4_mapping_exists (pkt4->ip_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);
- pkt4->tcp_hdr.crc = 0;
- uint32_t sum = 0;
- uint32_t tmp;
- tmp = pkt4->ip_hdr.sadr;
- sum =
- calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
- tmp = pkt4->ip_hdr.dadr;
- sum =
- calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
- tmp = (0x06 << 16) | (0xffff & pktlen);
- tmp = htonl(tmp);
- sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
- sum =
- calculate_checksum_update (sum, (uint16_t *) & pkt4->tcp_hdr, pktlen);
- pkt4->tcp_hdr.crc = calculate_checksum_end (sum);
- pkt4->ip_hdr.chks =
- calculate_ip_checksum ((uint16_t *) & pkt4->ip_hdr, 5 * 4);
- write_to_helper (pkt4, 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 __attribute__((unused)),
- const char *cfgfilep __attribute__((unused)),
- const struct GNUNET_CONFIGURATION_Handle *cfg_)
- {
- static const 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},
- {receive_udp_back, GNUNET_MESSAGE_TYPE_REMOTE_UDP_BACK, 0},
- {receive_tcp_back, GNUNET_MESSAGE_TYPE_REMOTE_TCP_BACK, 0},
- {NULL, 0, 0}
- };
- static const GNUNET_MESH_ApplicationType types[] = {
- GNUNET_APPLICATION_TYPE_END
- };
- mesh_handle = GNUNET_MESH_connect(cfg_,
- NULL,
- NULL,
- handlers,
- types);
- 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);
- conn_task = GNUNET_SCHEDULER_add_now (connect_to_service_dns, NULL);
- shs_task = 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.
- *
- * @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) {
- 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 */
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