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-rw-r--r--src/vpn/gnunet-vpn.c334
1 files changed, 334 insertions, 0 deletions
diff --git a/src/vpn/gnunet-vpn.c b/src/vpn/gnunet-vpn.c
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+++ b/src/vpn/gnunet-vpn.c
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+/*
+ This file is part of GNUnet.
+ (C) 2012 Christian Grothoff (and other contributing authors)
+
+ 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 src/vpn/gnunet-vpn.c
+ * @brief Tool to manually request VPN tunnels to be created
+ * @author Christian Grothoff
+ */
+
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_vpn_service.h"
+
+
+/**
+ * Handle to vpn service.
+ */
+static struct GNUNET_VPN_Handle *handle;
+
+/**
+ * Opaque redirection request handle.
+ */
+static struct GNUNET_VPN_RedirectionRequest *request;
+
+/**
+ * Option -p: destination peer identity for service
+ */
+static char *peer_id;
+
+/**
+ * Option -s: service name (hash to get service descriptor)
+ */
+static char *service_name;
+
+/**
+ * Option -i: target IP
+ */
+static char *target_ip;
+
+/**
+ * Option -4: IPv4 requested.
+ */
+static int ipv4;
+
+/**
+ * Option -6: IPv6 requested.
+ */
+static int ipv6;
+
+/**
+ * Option -t: TCP requested.
+ */
+static int tcp;
+
+/**
+ * Option -u: UDP requested.
+ */
+static int udp;
+
+/**
+ * Selected level of verbosity.
+ */
+static int verbosity;
+
+/**
+ * Option '-a': Notify only once the tunnel is connected?
+ */
+static int nac;
+
+/**
+ * Global return value.
+ */
+static int ret;
+
+/**
+ * Option '-d': duration of the mapping
+ */
+static unsigned long long duration = 5 * 60;
+
+
+/**
+ * Shutdown.
+ */
+static void
+do_disconnect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ if (NULL != request)
+ {
+ GNUNET_VPN_cancel_request (request);
+ request = NULL;
+ }
+ if (NULL != handle)
+ {
+ GNUNET_VPN_disconnect (handle);
+ handle = NULL;
+ }
+ GNUNET_free_non_null (peer_id);
+ GNUNET_free_non_null (service_name);
+ GNUNET_free_non_null (target_ip);
+}
+
+
+/**
+ * Callback invoked from the VPN service once a redirection is
+ * available. Provides the IP address that can now be used to
+ * reach the requested destination.
+ *
+ * @param cls closure
+ * @param af address family, AF_INET or AF_INET6; AF_UNSPEC on error;
+ * will match 'result_af' from the request
+ * @param address IP address (struct in_addr or struct in_addr6, depending on 'af')
+ * that the VPN allocated for the redirection;
+ * traffic to this IP will now be redirected to the
+ * specified target peer; NULL on error
+ */
+static void
+allocation_cb (void *cls,
+ int af,
+ const void *address)
+{
+ char buf[INET6_ADDRSTRLEN];
+
+ request = NULL;
+ switch (af)
+ {
+ case AF_INET6:
+ case AF_INET:
+ FPRINTF (stdout,
+ "%s\n",
+ inet_ntop (af, address, buf, sizeof (buf)));
+ break;
+ case AF_UNSPEC:
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Error creating tunnel\n"));
+ ret = 1;
+ break;
+ default:
+ break;
+ }
+ GNUNET_SCHEDULER_shutdown ();
+}
+
+
+/**
+ * Main function that will be run by the scheduler.
+ *
+ * @param cls closure
+ * @param args remaining command-line arguments
+ * @param cfgfile name of the configuration file used (for saving, can be NULL!)
+ * @param cfg configuration
+ */
+static void
+run (void *cls, char *const *args, const char *cfgfile,
+ const struct GNUNET_CONFIGURATION_Handle *cfg)
+{
+ int dst_af;
+ int req_af;
+ struct GNUNET_PeerIdentity peer;
+ GNUNET_HashCode sd;
+ const void *addr;
+ struct in_addr v4;
+ struct in6_addr v6;
+ uint8_t protocol;
+ struct GNUNET_TIME_Absolute etime;
+
+ etime = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
+ (unsigned int) duration));
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
+ &do_disconnect, NULL);
+ handle = GNUNET_VPN_connect (cfg);
+ if (NULL == handle)
+ goto error;
+ req_af = AF_UNSPEC;
+ if (ipv4)
+ {
+ if (ipv6)
+ {
+ FPRINTF (stderr, _("Option `%s' makes no sense with option `%s'.\n"),
+ "-4", "-6");
+ goto error;
+ }
+ req_af = AF_INET;
+ }
+ if (ipv6)
+ req_af = AF_INET6;
+
+ if (NULL == target_ip)
+ {
+ if (NULL == service_name)
+ {
+ FPRINTF (stderr, _("Option `%s' or `%s' is required.\n"),
+ "-i", "-s");
+ goto error;
+ }
+ if (NULL == peer_id)
+ {
+ FPRINTF (stderr, _("Option `%s' is required when using option `%s'.\n"),
+ "-p", "-s");
+ goto error;
+ }
+ if (! (tcp | udp) )
+ {
+ FPRINTF (stderr, _("Option `%s' or `%s' is required when using option `%s'.\n"),
+ "-t", "-u", "-s");
+ goto error;
+ }
+ if (tcp & udp)
+ {
+ FPRINTF (stderr, _("Option `%s' makes no sense with option `%s'.\n"),
+ "-t", "-u");
+ goto error;
+ }
+ if (tcp)
+ protocol = IPPROTO_TCP;
+ if (udp)
+ protocol = IPPROTO_UDP;
+ if (GNUNET_OK !=
+ GNUNET_CRYPTO_hash_from_string (peer_id,
+ &peer.hashPubKey))
+ {
+ FPRINTF (stderr, _("`%s' is not a valid peer identifier.\n"),
+ peer_id);
+ goto error;
+ }
+ GNUNET_CRYPTO_hash (service_name,
+ strlen (service_name),
+ &sd);
+ request = GNUNET_VPN_redirect_to_peer (handle,
+ req_af,
+ protocol,
+ &peer,
+ &sd,
+ nac,
+ etime,
+ &allocation_cb, NULL);
+ }
+ else
+ {
+ if (1 != inet_pton (AF_INET6, target_ip, &v6))
+ {
+ if (1 != inet_pton (AF_INET, target_ip, &v4))
+ {
+ FPRINTF (stderr, _("`%s' is not a valid IP address.\n"),
+ target_ip);
+ goto error;
+ }
+ else
+ {
+ dst_af = AF_INET;
+ addr = &v4;
+ }
+ }
+ else
+ {
+ dst_af = AF_INET6;
+ addr = &v6;
+ }
+ request = GNUNET_VPN_redirect_to_ip (handle,
+ req_af,
+ dst_af,
+ addr,
+ nac,
+ etime,
+ &allocation_cb, NULL);
+ }
+ return;
+
+ error:
+ GNUNET_SCHEDULER_shutdown ();
+ ret = 1;
+}
+
+
+int
+main (int argc, char *const *argv)
+{
+ static const struct GNUNET_GETOPT_CommandLineOption options[] = {
+ {'4', "ipv4", NULL,
+ gettext_noop ("request that result should be an IPv4 address"),
+ 0, &GNUNET_GETOPT_set_one, &ipv4},
+ {'6', "ipv6", NULL,
+ gettext_noop ("request that result should be an IPv6 address"),
+ 0, &GNUNET_GETOPT_set_one, &ipv6},
+ {'a', "after-connect", NULL,
+ gettext_noop ("print IP address only after mesh tunnel has been created"),
+ 0, &GNUNET_GETOPT_set_one, &ipv6},
+ {'d', "duration", "SECONDS",
+ gettext_noop ("how long should the mapping be valid for new tunnels?"),
+ 1, &GNUNET_GETOPT_set_ulong, &duration},
+ {'i', "ip", "IP",
+ gettext_noop ("destination IP for the tunnel"),
+ 1, &GNUNET_GETOPT_set_string, &target_ip},
+ {'p', "peer", "PEERID",
+ gettext_noop ("peer offering the service we would like to access"),
+ 1, &GNUNET_GETOPT_set_string, &peer_id},
+ {'s', "service", "NAME",
+ gettext_noop ("name of the service we would like to access"),
+ 1, &GNUNET_GETOPT_set_string, &service_name},
+ {'t', "tcp", NULL,
+ gettext_noop ("service is offered via TCP"),
+ 0, &GNUNET_GETOPT_set_one, &tcp},
+ {'u', "udp", NULL,
+ gettext_noop ("service is offered via UDP"),
+ 0, &GNUNET_GETOPT_set_one, &udp},
+
+ GNUNET_GETOPT_OPTION_VERBOSE (&verbosity),
+ GNUNET_GETOPT_OPTION_END
+ };
+ return (GNUNET_OK ==
+ GNUNET_PROGRAM_run (argc, argv, "gnunet-vpn",
+ gettext_noop
+ ("Setup tunnels via VPN."), options,
+ &run, NULL)) ? ret : 1;
+}
+
+
+/* end of gnunet-vpn.c */
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-21 14:38:30 +0000