/**
* @file vpn/gnunet-daemon-vpn.c
- * @brief
+ * @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-service-dns-p.h"
+#include <gnunet_mesh_service.h>
#include "gnunet_client_lib.h"
#include "gnunet_container_lib.h"
-#include "block_dns.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;
/**
- * Final status code.
- */
-static int ret;
-
-/**
- * The configuration to use
- */
-static const struct GNUNET_CONFIGURATION_Handle *cfg;
-
-/**
- * PipeHandle to receive data from the helper
- */
-static struct GNUNET_DISK_PipeHandle* helper_in;
-
-/**
- * PipeHandle to send data to the helper
- */
-static struct GNUNET_DISK_PipeHandle* helper_out;
-
-/**
- * FileHandle to receive data from the helper
- */
-static const struct GNUNET_DISK_FileHandle* fh_from_helper;
-
-/**
- * FileHandle to send data to the helper
- */
-static const struct GNUNET_DISK_FileHandle* fh_to_helper;
-
-/**
- * The Message-Tokenizer that tokenizes the messages comming from the helper
- */
-static struct GNUNET_SERVER_MessageStreamTokenizer* mst;
-
-/**
- * The connection to the service-dns
- */
-static struct GNUNET_CLIENT_Connection *dns_connection;
-
-/**
- * A flag to show that the service-dns has to rehijack the outbound dns-packets
- *
- * This gets set when the helper restarts as the routing-tables are flushed when
- * the interface vanishes.
+ * If there are at least this many address-mappings, old ones will be removed
*/
-static unsigned char restart_hijack;
+static long long unsigned int max_mappings = 200;
/**
- * The process id of the helper
- */
-static struct GNUNET_OS_Process *helper_proc;
-
-/**
- * a list of outgoing dns-query-packets
- */
-static struct query_packet_list *head;
-
-/**
- * The last element of the list of outgoing dns-query-packets
- */
-static struct query_packet_list *tail;
-
-/**
- * A list of processed dns-responses.
- *
- * "processed" means that the packet is complete and can be sent out via udp
- * directly
- */
-static struct answer_packet_list *answer_proc_head;
-
-/**
- * The last element of the list of processed dns-responses.
- */
-static struct answer_packet_list *answer_proc_tail;
-
-/**
- * The hashmap containing the mappings from ipv6-addresses to gnunet-descriptors
+ * Final status code.
*/
-static struct GNUNET_CONTAINER_MultiHashMap* hashmap;
-
-struct map_entry {
- struct GNUNET_vpn_service_descriptor desc;
- uint16_t namelen;
- /**
- * In DNS-Format!
- */
- char name[1];
-};
-
-static void helper_read(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx);
-static void dns_answer_handler(void* cls, const struct GNUNET_MessageHeader *msg);
+static int ret;
/**
- * Callback called by notify_transmit_ready; sends dns-queries or rehijack-messages
- * to the service-dns
- * {{{
+ * This hashmap contains the mapping from peer, service-descriptor,
+ * source-port and destination-port to a socket
*/
-static size_t
-send_query(void* cls, size_t size, void* buf) {
- size_t len;
- /*
- * Send the rehijack-message
- */
- if (restart_hijack == 1)
- {
- restart_hijack = 0;
- /*
- * The message is just a header
- */
- GNUNET_assert(sizeof(struct GNUNET_MessageHeader) <= size);
- struct GNUNET_MessageHeader* hdr = buf;
- len = sizeof(struct GNUNET_MessageHeader);
- hdr->size = htons(len);
- hdr->type = htons(GNUNET_MESSAGE_TYPE_REHIJACK);
- }
- else
- {
- struct query_packet_list* query = head;
- len = ntohs(query->pkt.hdr.size);
-
- GNUNET_assert(len <= size);
-
- memcpy(buf, &query->pkt.hdr, len);
-
- GNUNET_CONTAINER_DLL_remove (head, tail, query);
-
- GNUNET_free(query);
- }
-
- /*
- * Check whether more data is to be sent
- */
- if (head != NULL)
- {
- GNUNET_CLIENT_notify_transmit_ready(dns_connection, ntohs(head->pkt.hdr.size), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, &send_query, NULL);
- }
- else if (restart_hijack == 1)
- {
- GNUNET_CLIENT_notify_transmit_ready(dns_connection, sizeof(struct GNUNET_MessageHeader), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, &send_query, NULL);
- }
-
- return len;
-}
-/* }}} */
+static struct GNUNET_CONTAINER_MultiHashMap *udp_connections;
/**
* Function scheduled as very last function, cleans up after us
GNUNET_assert (0 != (tskctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN));
/* stop the helper */
- if (helper_proc != NULL)
- {
- GNUNET_OS_process_kill (helper_proc, SIGTERM);
- GNUNET_OS_process_wait (helper_proc);
- GNUNET_OS_process_close (helper_proc);
- helper_proc = NULL;
- }
+ 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;
}
-}
-/*}}}*/
-
-/**
- * Start the helper-process
- * {{{
- */
-static void
-start_helper_and_schedule(void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc) {
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- return;
-
- helper_in = GNUNET_DISK_pipe (GNUNET_YES, GNUNET_YES, GNUNET_NO);
- helper_out = GNUNET_DISK_pipe (GNUNET_YES, GNUNET_NO, GNUNET_YES);
-
- if (helper_in == NULL || helper_out == NULL) return;
- helper_proc = GNUNET_OS_start_process(helper_in, helper_out, "gnunet-helper-vpn", "gnunet-helper-vpn", NULL);
-
- fh_from_helper = GNUNET_DISK_pipe_handle (helper_out, GNUNET_DISK_PIPE_END_READ);
- fh_to_helper = GNUNET_DISK_pipe_handle (helper_in, GNUNET_DISK_PIPE_END_WRITE);
-
- GNUNET_DISK_pipe_close_end(helper_out, GNUNET_DISK_PIPE_END_WRITE);
- GNUNET_DISK_pipe_close_end(helper_in, GNUNET_DISK_PIPE_END_READ);
-
- /* Tell the dns-service to rehijack the dns-port
- * The routing-table gets flushed if an interface disappears.
- */
- restart_hijack = 1;
- GNUNET_CLIENT_notify_transmit_ready(dns_connection, sizeof(struct GNUNET_MessageHeader), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, &send_query, NULL);
-
- GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL, fh_from_helper, &helper_read, NULL);
+ if (mesh_handle != NULL)
+ {
+ GNUNET_MESH_disconnect(mesh_handle);
+ mesh_handle = NULL;
+ }
}
/*}}}*/
/**
- * Restart the helper-process
- * {{{
+ * @return the hash of the IP-Address if a mapping exists, NULL otherwise
*/
-static void
-restart_helper(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
- // Kill the helper
- GNUNET_OS_process_kill (helper_proc, SIGKILL);
- GNUNET_OS_process_wait (helper_proc);
- GNUNET_OS_process_close (helper_proc);
- helper_proc = NULL;
-
- GNUNET_DISK_pipe_close(helper_in);
- GNUNET_DISK_pipe_close(helper_out);
-
- /* Restart the helper */
- GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, start_helper_and_schedule, NULL);
+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;
+ }
}
-/*}}}*/
-/**
- * Read from the helper-process
- * {{{
- */
static void
-helper_read(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx) {
- /* no message can be bigger then 64k */
- char buf[65535];
-
- if (tsdkctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
+collect_mappings(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tc) {
+ if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
return;
- int t = GNUNET_DISK_file_read(fh_from_helper, &buf, 65535);
-
- /* On read-error, restart the helper */
- if (t<=0) {
- GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Read error for header from vpn-helper: %m\n");
- GNUNET_SCHEDULER_add_now(restart_helper, cls);
- return;
- }
-
- /* FIXME */ GNUNET_SERVER_mst_receive(mst, NULL, buf, t, 0, 0);
-
- GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL, fh_from_helper, &helper_read, NULL);
-}
-/*}}}*/
-
-/**
- * Calculate the checksum of an IPv4-Header
- */
-static uint16_t
-calculate_ip_checksum(uint16_t* hdr, short len) {
- uint32_t sum = 0;
- for(; len >= 2; len -= 2)
- sum += *(hdr++);
- if (len == 1)
- sum += *((unsigned char*)hdr);
-
- sum = (sum >> 16) + (sum & 0xFFFF);
-
- return ~sum;
-}
+ struct map_entry* me = GNUNET_CONTAINER_heap_remove_root(heap);
-/**
- * Send an dns-answer-packet to the helper
- */
-static void
-helper_write(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx) {
- if (tsdkctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
- return;
+ /* This is free()ed memory! */
+ me->heap_node = NULL;
- struct answer_packet_list* ans = answer_proc_head;
- size_t len = ntohs(ans->pkt.hdr.size);
-
- GNUNET_assert(ans->pkt.subtype == GNUNET_DNS_ANSWER_TYPE_IP);
-
- GNUNET_assert (20 == sizeof (struct ip_hdr));
- GNUNET_assert (8 == sizeof (struct udp_pkt));
- size_t data_len = len - sizeof(struct answer_packet) + 1;
- size_t net_len = sizeof(struct ip_hdr) + sizeof(struct udp_dns) + data_len;
- size_t pkt_len = sizeof(struct GNUNET_MessageHeader) + sizeof(struct pkt_tun) + net_len;
-
- struct ip_udp_dns* pkt = alloca(pkt_len);
- memset(pkt, 0, pkt_len);
-
- /* set the gnunet-header */
- pkt->shdr.size = htons(pkt_len);
- pkt->shdr.type = htons(GNUNET_MESSAGE_TYPE_VPN_HELPER);
-
- /* set the tun-header (no flags and ethertype of IPv4) */
- pkt->tun.flags = 0;
- pkt->tun.type = htons(0x0800);
-
- /* set the ip-header */
- pkt->ip_hdr.version = 4;
- pkt->ip_hdr.hdr_lngth = 5;
- pkt->ip_hdr.diff_serv = 0;
- pkt->ip_hdr.tot_lngth = htons(net_len);
- pkt->ip_hdr.ident = 0;
- pkt->ip_hdr.flags = 0;
- pkt->ip_hdr.frag_off = 0;
- pkt->ip_hdr.ttl = 255;
- pkt->ip_hdr.proto = 0x11; /* UDP */
- pkt->ip_hdr.chks = 0; /* Will be calculated later*/
- pkt->ip_hdr.sadr = ans->pkt.from;
- pkt->ip_hdr.dadr = ans->pkt.to;
-
- pkt->ip_hdr.chks = calculate_ip_checksum((uint16_t*)&pkt->ip_hdr, 5*4);
-
- /* set the udp-header */
- pkt->udp_dns.udp_hdr.spt = htons(53);
- pkt->udp_dns.udp_hdr.dpt = ans->pkt.dst_port;
- pkt->udp_dns.udp_hdr.len = htons(net_len - sizeof(struct ip_hdr));
- pkt->udp_dns.udp_hdr.crc = 0; /* Optional for IPv4 */
-
- memcpy(&pkt->udp_dns.data, ans->pkt.data, data_len);
-
- GNUNET_CONTAINER_DLL_remove (answer_proc_head, answer_proc_tail, ans);
- GNUNET_free(ans);
-
- /* FIXME */ GNUNET_DISK_file_write(fh_to_helper, pkt, pkt_len);
-
- /* if more packets are available, reschedule */
- if (answer_proc_head != NULL)
- GNUNET_SCHEDULER_add_write_file (GNUNET_TIME_UNIT_FOREVER_REL,
- fh_to_helper,
- &helper_write,
- NULL);
-}
+ /* FIXME! GNUNET_MESH_close_tunnel(state->tunnel); */
-/**
- * @return GNUNET_YES if a mapping exists
- */
-static int
-address_mapping_exists(unsigned char addr[]) {
- GNUNET_HashCode* key = alloca(sizeof(GNUNET_HashCode));
- memset(key, 0, sizeof(GNUNET_HashCode));
- memcpy(key, addr, 16);
+ GNUNET_CONTAINER_multihashmap_remove(hashmap, &me->hash, me);
- return GNUNET_CONTAINER_multihashmap_contains(hashmap, key);
+ GNUNET_free(me);
}
-static void
+void
send_icmp_response(void* cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
struct ip6_icmp* request = cls;
struct ip6_icmp* response = alloca(ntohs(request->shdr.size));
+ GNUNET_assert(response != NULL);
memset(response, 0, ntohs(request->shdr.size));
response->shdr.size = request->shdr.size;
/* Copy the rest of the packet */
memcpy(response+1, request+1, ntohs(request->shdr.size) - sizeof(struct ip6_icmp));
- /* FIXME */ GNUNET_DISK_file_write(fh_to_helper, response, ntohs(response->shdr.size));
+ write_to_helper(response, ntohs(response->shdr.size));
GNUNET_free(request);
}
/**
- * Receive packets from the helper-process
+ * cls is the pointer to a GNUNET_MessageHeader that is
+ * followed by the service-descriptor and the packet that should be sent;
*/
-static void
-message_token(void *cls,
- void *client,
- const struct GNUNET_MessageHeader *message) {
- GNUNET_assert(ntohs(message->type) == GNUNET_MESSAGE_TYPE_VPN_HELPER);
-
- struct tun_pkt *pkt_tun = (struct tun_pkt*) message;
+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;
+}
- /* 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;
-
- 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;
- 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 && address_mapping_exists(pkt6->ip6_hdr.dadr))
- {
- pkt6_icmp = GNUNET_malloc(ntohs(pkt6->shdr.size));
- memcpy(pkt6_icmp, pkt6, ntohs(pkt6->shdr.size));
- GNUNET_SCHEDULER_add_now(&send_icmp_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;
- GNUNET_assert(pkt->ip_hdr.version == 4);
+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;
+}
- /* Send dns-packets to the service-dns */
- if (pkt->ip_hdr.proto == 0x11 && ntohs(udp->udp_hdr.dpt) == 53 )
- {
- /* 9 = 8 for the udp-header + 1 for the unsigned char data[1]; */
- size_t len = sizeof(struct query_packet) + ntohs(udp->udp_hdr.len) - 9;
-
- struct query_packet_list* query = GNUNET_malloc(len + 2*sizeof(struct query_packet_list*));
- query->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_QUERY_DNS);
- query->pkt.hdr.size = htons(len);
- query->pkt.orig_to = pkt->ip_hdr.dadr;
- query->pkt.orig_from = pkt->ip_hdr.sadr;
- query->pkt.src_port = udp->udp_hdr.spt;
- memcpy(query->pkt.data, udp->data, ntohs(udp->udp_hdr.len) - 8);
-
- GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, query);
-
- if (dns_connection != NULL)
- GNUNET_CLIENT_notify_transmit_ready(dns_connection,
- len,
- GNUNET_TIME_UNIT_FOREVER_REL,
- GNUNET_YES,
- &send_query,
- NULL);
- }
- }
+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);
}
/**
- * Connect to the service-dns
+ * Create a new Address from an answer-packet
*/
-static void
-connect_to_service_dns (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc) {
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- return;
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Connecting to service-dns\n");
- GNUNET_assert (dns_connection == NULL);
- dns_connection = GNUNET_CLIENT_connect ("dns", cfg);
- GNUNET_CLIENT_receive(dns_connection, &dns_answer_handler, NULL, GNUNET_TIME_UNIT_FOREVER_REL);
-
- /* If a packet is already in the list, schedule to send it */
- if (head != NULL)
- GNUNET_CLIENT_notify_transmit_ready(dns_connection,
- ntohs(head->pkt.hdr.size),
- GNUNET_TIME_UNIT_FOREVER_REL,
- GNUNET_YES,
- &send_query,
- NULL);
- else if (restart_hijack == 1)
- {
- GNUNET_CLIENT_notify_transmit_ready(dns_connection, sizeof(struct GNUNET_MessageHeader), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, &send_query, NULL);
- }
+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);
+}
+/*}}}*/
+
+char
+max (char a, char b)
+{
+ return a > b ? a : b;
}
/**
* Create a new Address from an answer-packet
- * {{{
*/
void
-new_ip6addr(char* buf, struct answer_packet* pkt) {
- memcpy(buf, (int[]){htons(0x1234)}, 2);
- memcpy(buf+2, &pkt->service_descr.service_descriptor, 6);
- memcpy(buf+8, &pkt->service_descr.peer, 8);
+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));
}
/*}}}*/
* At the moment this means "inventing" and IPv6-Address for .gnunet-services and
* doing nothing for "real" services.
*/
-static void
+void
process_answer(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tc) {
struct answer_packet* pkt = cls;
struct answer_packet_list* list;
* It contains an almost complete DNS-Response, we have to fill in the ip
* at the offset pkt->addroffset
*/
- //FIXME htons?
if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_SERVICE)
{
pkt->subtype = GNUNET_DNS_ANSWER_TYPE_IP;
GNUNET_HashCode key;
memset(&key, 0, sizeof(GNUNET_HashCode));
- new_ip6addr((char*)&key, pkt);
+
+ 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 GNUNET_vpn_service_descriptor) + 2 + namelen);
+ struct map_entry* value = GNUNET_malloc(sizeof(struct map_entry) + namelen);
+ char* name = (char*)(value +1);
value->namelen = namelen;
- memcpy(value->name, pkt->data+12, namelen);
+ memcpy(name, pkt->data+12, namelen);
memcpy(&value->desc, &pkt->service_descr, sizeof(struct GNUNET_vpn_service_descriptor));
- if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_put(hashmap,
- &key,
- value,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
- {
- GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Could not store to hashmap\n");
- }
+ 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);
- memcpy(((char*)pkt)+ntohs(pkt->addroffset), &key, 16);
list = GNUNET_malloc(htons(pkt->hdr.size) + 2*sizeof(struct answer_packet_list*));
unsigned char c1 = s[(4*i)+1];
unsigned char c2 = s[(4*i)+3];
if (c1 <= '9')
- k[15-i] = c1 - '0';
+ k[i] = c1 - '0';
else
- k[15-i] = c1 - 87; /* 87 is the difference between 'a' and 10 */
+ k[i] = c1 - 87; /* 87 is the difference between 'a' and 10 */
if (c2 <= '9')
- k[15-i] += 16*(c2 - '0');
+ k[i] += 16*(c2 - '0');
else
- k[15-i] += 16*(c2 - 87);
+ k[i] += 16*(c2 - 87);
}
struct map_entry* map_entry = GNUNET_CONTAINER_multihashmap_get(hashmap, &key);
- unsigned short offset = ntohs(pkt->addroffset);
+ 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)
{
}
unsigned short namelen = htons(map_entry->namelen);
- char* name = map_entry->name;
+ 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;
- memcpy(rpkt, pkt, offset);
+ /* 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));
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_CONTAINER_DLL_insert_after(answer_proc_head, answer_proc_tail, answer_proc_tail, list);
- GNUNET_SCHEDULER_add_write_file (GNUNET_TIME_UNIT_FOREVER_REL, fh_to_helper, &helper_write, NULL);
+ schedule_helper_write(GNUNET_TIME_UNIT_FOREVER_REL, NULL);
return;
}
/**
- * This receives packets from the service-dns and schedules process_answer to
- * handle it
+ * Sets a bit active in a bitArray.
+ *
+ * @param bitArray memory area to set the bit in
+ * @param bitIdx which bit to set
*/
-static void
-dns_answer_handler(void* cls, const struct GNUNET_MessageHeader *msg) {
- /* the service disconnected, reconnect after short wait */
- if (msg == NULL)
- {
- GNUNET_CLIENT_disconnect(dns_connection, GNUNET_NO);
- dns_connection = NULL;
- GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS,
- &connect_to_service_dns,
- NULL);
- return;
- }
+void
+setBit (char *bitArray, unsigned int bitIdx)
+{
+ size_t arraySlot;
+ unsigned int targetBit;
+
+ arraySlot = bitIdx / 8;
+ targetBit = (1L << (bitIdx % 8));
+ bitArray[arraySlot] |= targetBit;
+}
- /* the service did something strange, reconnect immediately */
- if (msg->type != htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS))
- {
- GNUNET_break (0);
- GNUNET_CLIENT_disconnect(dns_connection, GNUNET_NO);
- dns_connection = NULL;
- GNUNET_SCHEDULER_add_now (&connect_to_service_dns,
- NULL);
- return;
- }
- void *pkt = GNUNET_malloc(ntohs(msg->size));
+/**
+ * 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;
+}
- memcpy(pkt, msg, ntohs(msg->size));
+/**
+ * @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);
+}
- GNUNET_SCHEDULER_add_now(process_answer, pkt);
- GNUNET_CLIENT_receive(dns_connection, &dns_answer_handler, NULL, GNUNET_TIME_UNIT_FOREVER_REL);
+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);
+
+ size_t pktlen = ntohs(message->size) - sizeof(struct GNUNET_MessageHeader) - sizeof(GNUNET_HashCode);
+ size_t size = pktlen + sizeof(struct ip6_tcp) - 1;
+
+ struct ip6_tcp* pkt6 = alloca(size);
+
+ GNUNET_assert(pkt6 != NULL);
+
+ new_ip6addr(pkt6->ip6_hdr.sadr, &other->hashPubKey, desc);
+
+ 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;
}
/**
* @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
+ * @param cfg_ configuration
*/
static void
run (void *cls,
char *const *args,
const char *cfgfile,
- const struct GNUNET_CONFIGURATION_Handle *cfg_) {
- mst = GNUNET_SERVER_mst_create(&message_token, NULL);
+ 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);
- GNUNET_SCHEDULER_add_now (connect_to_service_dns, NULL);
- GNUNET_SCHEDULER_add_now (start_helper_and_schedule, NULL);
+ 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);
}
}
/* end of gnunet-daemon-vpn.c */
+
projects / oweals / gnunet.git / blobdiff