2 This file is part of GNUnet.
3 (C) 2010 Christian Grothoff
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file vpn/gnunet-daemon-vpn.c
24 * @author Philipp Tölke
27 #include "gnunet_getopt_lib.h"
28 #include "gnunet_program_lib.h"
29 #include "gnunet_os_lib.h"
30 #include "gnunet-vpn-helper-p.h"
31 #include "gnunet-vpn-packet.h"
32 #include "gnunet-vpn-pretty-print.h"
33 #include "gnunet_common.h"
34 #include "gnunet_protocols.h"
35 #include "gnunet_server_lib.h"
36 #include "gnunet-service-dns-p.h"
37 #include "gnunet_client_lib.h"
38 #include "gnunet_container_lib.h"
46 struct GNUNET_DISK_PipeHandle* helper_in; // From the helper
47 struct GNUNET_DISK_PipeHandle* helper_out; // To the helper
48 const struct GNUNET_DISK_FileHandle* fh_from_helper;
50 struct GNUNET_SERVER_MessageStreamTokenizer* mst;
52 struct GNUNET_SCHEDULER_Handle *sched;
54 struct GNUNET_CLIENT_Connection *dns_connection;
58 struct query_packet_list *head;
59 struct query_packet_list *tail;
62 static struct vpn_cls mycls;
64 static void cleanup(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
65 if (tskctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) {
66 PLIBC_KILL(mycls.helper_pid, SIGTERM);
67 GNUNET_OS_process_wait(mycls.helper_pid);
71 static void helper_read(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx);
73 static void start_helper_and_schedule() {
74 mycls.helper_in = GNUNET_DISK_pipe (GNUNET_YES, GNUNET_YES, GNUNET_NO);;
75 mycls.helper_out = GNUNET_DISK_pipe (GNUNET_YES, GNUNET_NO, GNUNET_YES);
77 if (mycls.helper_in == NULL || mycls.helper_out == NULL) return;
79 mycls.helper_pid = GNUNET_OS_start_process(mycls.helper_in, mycls.helper_out, "gnunet-helper-vpn", "gnunet-helper-vpn", NULL);
81 mycls.fh_from_helper = GNUNET_DISK_pipe_handle (mycls.helper_out, GNUNET_DISK_PIPE_END_READ);
83 GNUNET_DISK_pipe_close_end(mycls.helper_out, GNUNET_DISK_PIPE_END_WRITE);
84 GNUNET_DISK_pipe_close_end(mycls.helper_in, GNUNET_DISK_PIPE_END_READ);
86 GNUNET_SCHEDULER_add_read_file (mycls.sched, GNUNET_TIME_UNIT_FOREVER_REL, mycls.fh_from_helper, &helper_read, NULL);
90 static void restart_helper(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
91 // FIXME: Ratelimit this!
94 PLIBC_KILL(mycls.helper_pid, SIGKILL);
95 GNUNET_OS_process_wait(mycls.helper_pid);
97 GNUNET_DISK_pipe_close(mycls.helper_in);
98 GNUNET_DISK_pipe_close(mycls.helper_out);
100 // Restart the helper
101 start_helper_and_schedule(mycls);
105 static void helper_read(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx) {
108 if (tsdkctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
111 int t = GNUNET_DISK_file_read(mycls.fh_from_helper, &buf, 65535);
113 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Read error for header: %m\n");
114 GNUNET_SCHEDULER_add_now(mycls.sched, restart_helper, cls);
118 /* FIXME */ GNUNET_SERVER_mst_receive(mycls.mst, NULL, buf, t, 0, 0);
120 GNUNET_SCHEDULER_add_read_file (mycls.sched, GNUNET_TIME_UNIT_FOREVER_REL, mycls.fh_from_helper, &helper_read, NULL);
123 size_t send_query(void* cls, size_t size, void* buf)
125 struct query_packet_list* query = mycls.head;
126 size_t len = ntohs(query->pkt.hdr.size);
128 GNUNET_assert(len <= size);
130 memcpy(buf, &query->pkt.hdr, len);
132 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Sent %d bytes.\n", len);
134 GNUNET_CONTAINER_DLL_remove (mycls.head, mycls.tail, query);
138 if (mycls.head != NULL) {
139 GNUNET_CLIENT_notify_transmit_ready(mycls.dns_connection, ntohs(mycls.head->pkt.hdr.size), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, &send_query, NULL);
145 static void message_token(void *cls, void *client, const struct GNUNET_MessageHeader *message) {
146 if (ntohs(message->type) != GNUNET_MESSAGE_TYPE_VPN_HELPER) return;
148 struct tun_pkt *pkt_tun = (struct tun_pkt*) message;
150 if (ntohs(pkt_tun->tun.type) == 0x86dd) {
151 struct ip6_pkt *pkt6 = (struct ip6_pkt*) message;
152 struct ip6_tcp *pkt6_tcp;
153 struct ip6_udp *pkt6_udp;
156 switch(pkt6->ip6_hdr.nxthdr) {
158 pkt6_tcp = (struct ip6_tcp*)pkt6;
159 pkt_printf_ip6tcp(pkt6_tcp);
162 pkt6_udp = (struct ip6_udp*)pkt6;
163 pkt_printf_ip6udp(pkt6_udp);
164 if (ntohs(pkt6_udp->udp_hdr.dpt) == 53) {
165 pkt_printf_ip6dns((struct ip6_udp_dns*)pkt6_udp);
169 } else if (ntohs(pkt_tun->tun.type) == 0x0800) {
170 struct ip_pkt *pkt = (struct ip_pkt*) message;
171 struct ip_udp *udp = (struct ip_udp*) message;
172 if (pkt->ip_hdr.proto == 0x11 && ntohs(udp->udp_hdr.dpt) == 53 ) {
173 size_t len = sizeof(struct query_packet) + ntohs(udp->udp_hdr.len) - 9; /* 9 = 8 for the udp-header + 1 for the unsigned char data[1]; */
174 struct query_packet_list* query = GNUNET_malloc(len + 2*sizeof(struct query_packet_list*));
175 query->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_QUERY_DNS);
176 query->pkt.hdr.size = htons(len);
177 query->pkt.orig_to = pkt->ip_hdr.dadr;
178 query->pkt.orig_from = pkt->ip_hdr.sadr;
179 query->pkt.src_port = udp->udp_hdr.spt;
180 memcpy(query->pkt.data, udp->data, ntohs(udp->udp_hdr.len) - 8);
182 GNUNET_CONTAINER_DLL_insert_after(mycls.head, mycls.tail, mycls.tail, query);
184 struct GNUNET_CLIENT_TransmitHandle* th = GNUNET_CLIENT_notify_transmit_ready(mycls.dns_connection, len, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, &send_query, NULL);
186 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Queued sending of %d bytes.\n", len);
188 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Already queued for %d bytes.\n", len);
195 * Main function that will be run by the scheduler.
198 * @param sched the scheduler to use
199 * @param args remaining command-line arguments
200 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
201 * @param cfg configuration
205 struct GNUNET_SCHEDULER_Handle *sched,
208 const struct GNUNET_CONFIGURATION_Handle *cfg)
211 mycls.mst = GNUNET_SERVER_mst_create(&message_token, NULL);
213 mycls.dns_connection = GNUNET_CLIENT_connect (sched, "dns", cfg);
214 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Connection: %x\n", mycls.dns_connection);
216 GNUNET_SCHEDULER_add_delayed(sched, GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
217 start_helper_and_schedule(mycls);
222 * The main function to obtain template from gnunetd.
224 * @param argc number of arguments from the command line
225 * @param argv command line arguments
226 * @return 0 ok, 1 on error
229 main (int argc, char *const *argv)
231 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
232 GNUNET_GETOPT_OPTION_END
236 GNUNET_PROGRAM_run (argc,
239 gettext_noop ("help text"),
240 options, &run, NULL)) ? ret : 1;
243 /* end of gnunet-daemon-vpn.c */