-skeleton for new PT daemon

1 files changed, 196 insertions, 0 deletions

diff --git a/src/pt/gnunet-daemon-pt.c b/src/pt/gnunet-daemon-pt.c
new file mode 100644
index 000000000..f8d83237a
--- /dev/null
+++ b/src/pt/gnunet-daemon-pt.c
@@ -0,0 +1,196 @@
+/*
+     This file is part of GNUnet.
+     (C) 2010, 2012 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 pt/gnunet-daemon-pt.c
+ * @brief tool to manipulate DNS and VPN services to perform protocol translation (IPvX over GNUnet)
+ * @author Christian Grothoff
+ *
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_dns_service.h"
+#include "gnunet_vpn_service.h"
+#include "gnunet_statistics_service.h"
+
+
+/**
+ * The handle to the configuration used throughout the process
+ */
+static const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+/**
+ * The handle to the VPN
+ */
+static struct GNUNET_VPN_Handle *vpn_handle;
+
+/**
+ * Statistics.
+ */
+static struct GNUNET_STATISTICS_Handle *stats;
+
+/**
+ * The handle to DNS
+ */
+static struct GNUNET_DNS_Handle *dns_handle;
+
+/**
+ * Are we doing IPv4-pt?
+ */
+static int ipv4_pt;
+
+/**
+ * Are we doing IPv6-pt?
+ */
+static int ipv6_pt;
+
+
+
+/**
+ * Signature of a function that is called whenever the DNS service
+ * encounters a DNS request and needs to do something with it.  The
+ * function has then the chance to generate or modify the response by
+ * calling one of the three "GNUNET_DNS_request_*" continuations.
+ *
+ * When a request is intercepted, this function is called first to
+ * give the client a chance to do the complete address resolution;
+ * "rdata" will be NULL for this first call for a DNS request, unless
+ * some other client has already filled in a response.
+ *
+ * If multiple clients exist, all of them are called before the global
+ * DNS.  The global DNS is only called if all of the clients'
+ * functions call GNUNET_DNS_request_forward.  Functions that call
+ * GNUNET_DNS_request_forward will be called again before a final
+ * response is returned to the application.  If any of the clients'
+ * functions call GNUNET_DNS_request_drop, the response is dropped.
+ *
+ * @param cls closure
+ * @param rh request handle to user for reply
+ * @param request_length number of bytes in request
+ * @param request udp payload of the DNS request
+ */
+static void 
+dns_request_handler (void *cls,
+                     struct GNUNET_DNS_RequestHandle *rh,
+                     size_t request_length,
+                     const char *request)
+{
+}
+
+
+/**
+ * Function scheduled as very last function, cleans up after us
+ */
+static void
+cleanup (void *cls GNUNET_UNUSED,
+         const struct GNUNET_SCHEDULER_TaskContext *tskctx)
+{
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Pt service is shutting down now\n");
+  if (vpn_handle != NULL)
+  {
+    GNUNET_VPN_disconnect (vpn_handle);
+    vpn_handle = NULL;
+  }
+  if (dns_handle != NULL)
+  {
+    GNUNET_DNS_disconnect (dns_handle);
+    dns_handle = NULL;
+  }
+  if (stats != NULL)
+  {
+    GNUNET_STATISTICS_destroy (stats, GNUNET_YES);
+    stats = NULL;
+  }
+}
+
+
+/**
+ * @brief 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 GNUNET_UNUSED,
+     const char *cfgfile GNUNET_UNUSED,
+     const struct GNUNET_CONFIGURATION_Handle *cfg_)
+{
+  cfg = cfg_;
+  stats = GNUNET_STATISTICS_create ("pt", cfg);
+  ipv4_pt = GNUNET_CONFIGURATION_get_value_yesno (cfg, "pt", "TUNNEL_IPV4");
+  ipv6_pt = GNUNET_CONFIGURATION_get_value_yesno (cfg, "pt", "TUNNEL_IPV6"); 
+  if (! (ipv4_pt || ipv6_pt))
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                _("No useful service enabled.  Exiting.\n"));
+    GNUNET_SCHEDULER_shutdown ();
+    return;    
+  }
+  GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
+  dns_handle 
+    = GNUNET_DNS_connect (cfg, 
+                          GNUNET_DNS_FLAG_POST_RESOLUTION,
+                          &dns_request_handler, NULL);
+  if (NULL == dns_handle)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                _("Failed to connect to %s service.  Exiting.\n"),
+                "DNS");
+    GNUNET_SCHEDULER_shutdown ();
+    return;
+  }
+  vpn_handle = GNUNET_VPN_connect (cfg);
+  if (NULL == vpn_handle)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                _("Failed to connect to %s service.  Exiting.\n"),
+                "VPN");
+    GNUNET_SCHEDULER_shutdown ();
+    return;
+  }
+}
+
+
+/**
+ * The main function
+ *
+ * @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, "gnunet-daemon-pt",
+                              gettext_noop
+                              ("Daemon to run to perform IP protocol translation to GNUnet"),
+                              options, &run, NULL)) ? 0 : 1;
+}
+
+
+/* end of gnunet-daemon-pt.c */