--- /dev/null
+/*
+ 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-dns.c
+ * @brief
+ * @author Philipp Toelke
+ */
+#include <platform.h>
+#include <gnunet_common.h>
+#include <gnunet_client_lib.h>
+#include <gnunet_os_lib.h>
+#include <gnunet_core_service.h>
+#include <gnunet_protocols.h>
+#include <gnunet_server_lib.h>
+#include <gnunet_container_lib.h>
+#include <block_dns.h>
+
+#include "gnunet-daemon-vpn-dns.h"
+#include "gnunet-daemon-vpn.h"
+#include "gnunet-daemon-vpn-helper.h"
+#include "gnunet-service-dns-p.h"
+#include "gnunet-vpn-packet.h"
+
+/**
+ * Callback called by notify_transmit_ready; sends dns-queries or rehijack-messages
+ * to the service-dns
+ * {{{
+ */
+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 if (head != NULL)
+ {
+ 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);
+ }
+ else
+ {
+ GNUNET_break(0);
+ len = 0;
+ }
+
+ /*
+ * 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;
+}
+/* }}} */
+
+
+/**
+ * Connect to the service-dns
+ */
+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);
+ /* This would most likely be a misconfiguration */
+ GNUNET_assert(dns_connection != NULL);
+ 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);
+ }
+}
+
+/**
+ * This receives packets from the service-dns and schedules process_answer to
+ * handle it
+ */
+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;
+ }
+
+ /* 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));
+
+ memcpy(pkt, msg, ntohs(msg->size));
+
+ GNUNET_SCHEDULER_add_now(process_answer, pkt);
+ GNUNET_CLIENT_receive(dns_connection, &dns_answer_handler, NULL, GNUNET_TIME_UNIT_FOREVER_REL);
+}
+
--- /dev/null
+/*
+ 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-helper.c
+ * @brief
+ * @author Philipp Toelke
+ */
+#include <platform.h>
+#include <gnunet_common.h>
+#include <gnunet_client_lib.h>
+#include <gnunet_os_lib.h>
+#include <gnunet_core_service.h>
+#include <gnunet_protocols.h>
+#include <gnunet_server_lib.h>
+#include <gnunet_container_lib.h>
+#include <block_dns.h>
+
+#include "gnunet-daemon-vpn-dns.h"
+#include "gnunet-daemon-vpn.h"
+#include "gnunet-daemon-vpn-helper.h"
+#include "gnunet-service-dns-p.h"
+#include "gnunet-vpn-packet.h"
+
+/**
+ * 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;
+
+/**
+ * Start the helper-process
+ * {{{
+ */
+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);
+}
+/*}}}*/
+/**
+ * Restart the helper-process
+ * {{{
+ */
+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);
+}
+/*}}}*/
+
+/**
+ * Read from the helper-process
+ * {{{
+ */
+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)
+ 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);
+}
+/*}}}*/
+
+/**
+ * Send an dns-answer-packet to the helper
+ */
+void
+helper_write(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx) {
+ if (tsdkctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
+ return;
+
+ 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);
+ GNUNET_assert(pkt != NULL);
+ 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);
+}
+/**
+ * Receive packets from the helper-process
+ */
+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;
+
+ /* 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;
+ GNUNET_HashCode* key;
+
+ switch(pkt6->ip6_hdr.nxthdr)
+ {
+ case 0x06:
+ pkt6_tcp = (struct ip6_tcp*)pkt6;
+ break;
+ case 0x11:
+ pkt6_udp = (struct ip6_udp*)pkt6;
+ if ((key = address_mapping_exists(pkt6->ip6_hdr.dadr)) != NULL)
+ {
+ struct map_entry* me = GNUNET_CONTAINER_multihashmap_get(hashmap, key);
+ GNUNET_assert(me != NULL);
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Mapping exists; type: %d; UDP is %d; port: %x/%x!\n", me->desc.service_type, htonl(GNUNET_DNS_SERVICE_TYPE_UDP), pkt6_udp->udp_hdr.dpt, me->desc.ports);
+ GNUNET_free(key);
+ if (me->desc.service_type & htonl(GNUNET_DNS_SERVICE_TYPE_UDP) &&
+ (port_in_ports(me->desc.ports, pkt6_udp->udp_hdr.dpt) ||
+ port_in_ports(me->additional_ports, pkt6_udp->udp_hdr.dpt)))
+ {
+ size_t size = sizeof(struct GNUNET_PeerIdentity) + sizeof(struct GNUNET_MessageHeader) + sizeof(GNUNET_HashCode) + ntohs(pkt6_udp->udp_hdr.len);
+ struct GNUNET_PeerIdentity *cls = GNUNET_malloc(size);
+ struct GNUNET_MessageHeader *hdr = (struct GNUNET_MessageHeader*)(cls+1);
+ GNUNET_HashCode* hc = (GNUNET_HashCode*)(hdr + 1);
+ memcpy(cls, &me->desc.peer, sizeof(struct GNUNET_PeerIdentity));
+ memcpy(hc, &me->desc.service_descriptor, sizeof(GNUNET_HashCode));
+ memcpy(hc+1, &pkt6_udp->udp_hdr, ntohs(pkt6_udp->udp_hdr.len));
+ GNUNET_CORE_peer_request_connect(core_handle,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ (struct GNUNET_PeerIdentity*)&me->desc.peer,
+ send_udp_to_peer,
+ cls);
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Queued to send to peer %x\n", *((unsigned int*)&me->desc.peer));
+ }
+ }
+ 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 = address_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_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);
+
+ /* 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);
+
+ GNUNET_assert(head != NULL);
+
+ if (dns_connection != NULL)
+ GNUNET_CLIENT_notify_transmit_ready(dns_connection,
+ len,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ GNUNET_YES,
+ &send_query,
+ NULL);
+ }
+ }
+}
+
+void write_to_helper(void* buf, size_t len)
+{
+ (void)GNUNET_DISK_file_write(fh_to_helper, buf, len);
+}
+
+void schedule_helper_write(struct GNUNET_TIME_Relative time, void* cls)
+{
+ GNUNET_SCHEDULER_add_write_file (time, fh_to_helper, &helper_write, cls);
+}
/**
* @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-helper-p.h"
#include "gnunet-vpn-pretty-print.h"
#include "gnunet_common.h"
+#include <gnunet_os_lib.h>
#include "gnunet_protocols.h"
-#include "gnunet_server_lib.h"
-#include "gnunet-service-dns-p.h"
-#include "gnunet_core_service.h"
+#include <gnunet_core_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"
/**
* 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.
- */
-static unsigned char restart_hijack;
-
-/**
- * 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
- */
-static struct GNUNET_CONTAINER_MultiHashMap* hashmap;
-
/**
* This hashmap contains the mapping from peer, service-descriptor,
* source-port and destination-port to a socket
*/
static struct GNUNET_CONTAINER_MultiHashMap *udp_connections;
-/**
- * The handle to core
- */
-static struct GNUNET_CORE_Handle *core_handle;
-
-struct map_entry {
- struct GNUNET_vpn_service_descriptor desc;
- uint16_t namelen;
- uint64_t additional_ports;
- /**
- * 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);
-
-/**
- * Callback called by notify_transmit_ready; sends dns-queries or rehijack-messages
- * to the service-dns
- * {{{
- */
-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;
-}
-/* }}} */
-
/**
* Function scheduled as very last function, cleans up after us
*{{{
}
/*}}}*/
-/**
- * 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);
-}
-/*}}}*/
-
-/**
- * Restart the helper-process
- * {{{
- */
-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);
-}
-/*}}}*/
-
-/**
- * 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)
- 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);
-}
-/*}}}*/
-
static uint32_t calculate_checksum_update(uint32_t sum, uint16_t *hdr, short len) {
for(; len >= 2; len -= 2)
sum += *(hdr++);
/**
* Calculate the checksum of an IPv4-Header
*/
-static uint16_t
+uint16_t
calculate_ip_checksum(uint16_t* hdr, short len) {
uint32_t sum = calculate_checksum_update(0, hdr, len);
return calculate_checksum_end(sum);
}
-/**
- * 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;
-
- 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);
- GNUNET_assert(pkt != NULL);
- 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);
-}
-
/**
* @return the hash of the IP-Address if a mapping exists, NULL otherwise
*/
-static GNUNET_HashCode*
+GNUNET_HashCode*
address_mapping_exists(unsigned char addr[]) {
GNUNET_HashCode* key = GNUNET_malloc(sizeof(GNUNET_HashCode));
unsigned char* k = (unsigned char*)key;
}
}
-static void
+void
send_icmp_response(void* cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
struct ip6_icmp* request = cls;
/* 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);
}
* followed by the service-descriptor and the udp-packet that should be sent;
*/
static size_t
-handle_udp (void *cls, size_t size, void *buf)
+send_udp_to_peer_notify_callback (void *cls, size_t size, void *buf)
{
struct GNUNET_PeerIdentity *peer = cls;
struct GNUNET_MessageHeader *hdr =
return size;
}
-static unsigned int
+unsigned int
port_in_ports (uint64_t ports, uint16_t port)
{
uint16_t *ps = (uint16_t *) & ports;
}
void
-send_udp (void *cls,
- int success)
+send_udp_to_peer (void *cls,
+ int success)
{
struct GNUNET_PeerIdentity *peer = cls;
struct GNUNET_MessageHeader *hdr =
htons (sizeof
(struct GNUNET_MessageHeader) +
sizeof (GNUNET_HashCode) +
- ntohs (udp->len)), handle_udp,
+ ntohs (udp->len)), send_udp_to_peer_notify_callback,
cls);
}
-/**
- * Receive packets from the helper-process
- */
-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;
-
- /* 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;
- GNUNET_HashCode* key;
-
- 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;
- if ((key = address_mapping_exists(pkt6->ip6_hdr.dadr)) != NULL)
- {
- struct map_entry* me = GNUNET_CONTAINER_multihashmap_get(hashmap, key);
- GNUNET_assert(me != NULL);
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Mapping exists; type: %d; UDP is %d; port: %x/%x!\n", me->desc.service_type, htonl(GNUNET_DNS_SERVICE_TYPE_UDP), pkt6_udp->udp_hdr.dpt, me->desc.ports);
- GNUNET_free(key);
- if (me->desc.service_type & htonl(GNUNET_DNS_SERVICE_TYPE_UDP) &&
- (port_in_ports(me->desc.ports, pkt6_udp->udp_hdr.dpt) ||
- port_in_ports(me->additional_ports, pkt6_udp->udp_hdr.dpt)))
- {
- size_t size = sizeof(struct GNUNET_PeerIdentity) + sizeof(struct GNUNET_MessageHeader) + sizeof(GNUNET_HashCode) + ntohs(pkt6_udp->udp_hdr.len);
- struct GNUNET_PeerIdentity *cls = GNUNET_malloc(size);
- struct GNUNET_MessageHeader *hdr = (struct GNUNET_MessageHeader*)(cls+1);
- GNUNET_HashCode* hc = (GNUNET_HashCode*)(hdr + 1);
- memcpy(cls, &me->desc.peer, sizeof(struct GNUNET_PeerIdentity));
- memcpy(hc, &me->desc.service_descriptor, sizeof(GNUNET_HashCode));
- memcpy(hc+1, &pkt6_udp->udp_hdr, ntohs(pkt6_udp->udp_hdr.len));
- GNUNET_CORE_peer_request_connect(core_handle,
- GNUNET_TIME_UNIT_FOREVER_REL,
- (struct GNUNET_PeerIdentity*)&me->desc.peer,
- send_udp,
- cls);
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Queued to send to peer %x\n", *((unsigned int*)&me->desc.peer));
- }
- }
- 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 = address_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_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);
-
- /* 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);
- }
- }
-}
-
-/**
- * Connect to the service-dns
- */
-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);
- /* This would most likely be a misconfiguration */
- GNUNET_assert(dns_connection != NULL);
- 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);
- }
-}
-
/**
* Create a new Address from an answer-packet
- * {{{
*/
void
-new_ip6addr(char* buf, const GNUNET_HashCode *peer, const GNUNET_HashCode *service_desc) {
+new_ip6addr(char* buf, const GNUNET_HashCode *peer, const GNUNET_HashCode *service_desc) { /* {{{ */
memcpy(buf+14, (int[]){htons(0x3412)}, 2);
memcpy(buf+8, service_desc, 6);
memcpy(buf, peer, 8);
* 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;
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
- */
-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;
- }
-
- /* 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));
-
- memcpy(pkt, msg, ntohs(msg->size));
-
- GNUNET_SCHEDULER_add_now(process_answer, pkt);
- GNUNET_CLIENT_receive(dns_connection, &dns_answer_handler, NULL, GNUNET_TIME_UNIT_FOREVER_REL);
-}
-
-struct udp_state
-{
- struct GNUNET_PeerIdentity peer;
- GNUNET_HashCode desc;
- short spt;
- short dpt;
-};
-
-struct send_cls
-{
- struct GNUNET_NETWORK_Handle *sock;
- struct udp_state state;
-};
-
-static size_t
-send_udp_service (void *cls, size_t size, void *buf)
-{
- struct GNUNET_MessageHeader *hdr = cls;
- GNUNET_assert(size >= ntohs(hdr->size));
-
- memcpy(buf, cls, ntohs(hdr->size));
- size_t ret = ntohs(hdr->size);
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Sending %d bytes back!\n", ntohs(hdr->size));
- GNUNET_free(cls);
- return ret;
-}
-
-void
-receive_from_network (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- if (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
- {
- GNUNET_free(cls);
- return;
- }
- struct send_cls *data = cls;
-
- char buf[1400];
-
- struct sockaddr_in addr_in;
- socklen_t addr_len = sizeof(struct sockaddr_in);
- ssize_t len = GNUNET_NETWORK_socket_recvfrom (data->sock, buf, 1400, (struct sockaddr*)&addr_in, &addr_len);
-
- if (len < 0) {
- GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Problem reading from socket: %m\n");
- goto out;
- }
-
- size_t len_udp = len + sizeof (struct udp_pkt);
- size_t len_pkt = len_udp + sizeof (struct GNUNET_MessageHeader) + sizeof(GNUNET_HashCode);
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Sending data back: data: %d; udp: %d, pkt:%d\n", len, len_udp, len_pkt);
-
- struct GNUNET_MessageHeader *hdr = GNUNET_malloc (len_pkt);
- GNUNET_HashCode *desc = (GNUNET_HashCode *) (hdr + 1);
- struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
-
- hdr->size = htons (len_pkt);
- hdr->type = htons (GNUNET_MESSAGE_TYPE_SERVICE_UDP_BACK);
-
- pkt->dpt = htons(data->state.spt);
- pkt->spt = addr_in.sin_port;
- pkt->len = htons (len_udp);
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "UDP from %d to %d\n", ntohs(pkt->spt), ntohs(pkt->dpt));
- /* The chksm can only be computed knowing the ip-addresses */
-
- memcpy (desc, &data->state.desc, sizeof (GNUNET_HashCode));
- memcpy (pkt + 1, buf, len);
-
- GNUNET_CORE_notify_transmit_ready (core_handle, 42,
- GNUNET_TIME_relative_divide(GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
- &data->state.peer, len_pkt,
- send_udp_service, hdr);
-
-out:
- GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, data->sock,
- receive_from_network, cls);
-}
-
-void
-send_to_network (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- if (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
- return;
- struct send_cls *data = cls;
- struct udp_pkt *pkt = (struct udp_pkt *) (data + 1);
-
- struct sockaddr_in a4;
- memset(&a4, 0, sizeof(struct sockaddr_in));
- a4.sin_family = AF_INET;
- a4.sin_port = htons(data->state.dpt);
- memcpy(&a4.sin_addr.s_addr, (char[]){127, 0, 0, 1}, 4);
-
- GNUNET_NETWORK_socket_sendto (data->sock, pkt + 1,
- ntohs (pkt->len) - sizeof (struct udp_pkt),
- (struct sockaddr*)&a4, sizeof a4);
-
- GNUNET_free(cls);
-
-}
-
static void
add_additional_port (struct map_entry *me, uint16_t port)
{
sum = calculate_checksum_update(sum, (uint16_t*)&pkt6->udp_hdr, ntohs(pkt->len));
pkt6->udp_hdr.crc = calculate_checksum_end(sum);
-
- /* FIXME */ GNUNET_DISK_file_write(fh_to_helper, pkt6, size);
-
- return GNUNET_OK;
-}
-
-static int
-receive_udp_service (void *cls, const struct GNUNET_PeerIdentity *other,
- const struct GNUNET_MessageHeader *message,
- const struct GNUNET_TRANSPORT_ATS_Information *atsi)
-{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received UDP-Packet from peer %s\n",
- GNUNET_i2s (other));
- GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
- struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
-
- /* FIXME -> check acl etc */
- GNUNET_assert (ntohs (pkt->len) ==
- ntohs (message->size) -
- sizeof (struct GNUNET_MessageHeader) -
- sizeof (GNUNET_HashCode));
-
- size_t state_size = sizeof (struct udp_state);
- size_t cls_size = sizeof (struct send_cls) + ntohs (pkt->len);
- struct send_cls *send = GNUNET_malloc (cls_size);
- struct udp_state *state = &send->state;
- unsigned int new = GNUNET_NO;
-
- memcpy (&state->peer, other, sizeof (struct GNUNET_PeerIdentity));
- memcpy (&state->desc, desc, sizeof (GNUNET_HashCode));
- state->spt = ntohs (pkt->spt);
-
- /* Hash without the dpt, so that eg tftp works */
- state->dpt = 0;
-
- memcpy (send + 1, pkt, ntohs (pkt->len));
-
- GNUNET_HashCode hash;
- GNUNET_CRYPTO_hash (state, state_size, &hash);
-
- state->dpt = ntohs (pkt->dpt);
-
- struct GNUNET_NETWORK_Handle *sock =
- GNUNET_CONTAINER_multihashmap_get (udp_connections, &hash);
-
- if (sock == NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Creating new Socket!\n");
- sock = GNUNET_NETWORK_socket_create (AF_INET, SOCK_DGRAM, 0);
- GNUNET_assert(sock != NULL);
- new = GNUNET_YES;
- }
-
- send->sock = sock;
-
- GNUNET_CONTAINER_multihashmap_put (udp_connections, &hash, sock,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
-
-
- if (new)
- {
- struct send_cls *recv = GNUNET_malloc (sizeof (struct send_cls));
- memcpy (recv, send, sizeof (struct send_cls));
- GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, sock,
- receive_from_network, recv);
- }
-
- GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL, sock,
- send_to_network, send);
+ write_to_helper(pkt6, size);
return GNUNET_OK;
}
run (void *cls,
char *const *args,
const char *cfgfile,
- const struct GNUNET_CONFIGURATION_Handle *cfg_) {
+ const struct GNUNET_CONFIGURATION_Handle *cfg_)
+{
const static struct GNUNET_CORE_MessageHandler handlers[] = {
- {receive_udp_service, GNUNET_MESSAGE_TYPE_SERVICE_UDP, 0},
{receive_udp_back, GNUNET_MESSAGE_TYPE_SERVICE_UDP_BACK, 0},
{NULL, 0, 0}
};
}
/* end of gnunet-daemon-vpn.c */
+
projects / oweals / gnunet.git / commitdiff