split up daemon-vpn in multiple files, remove exit-functionality

1 files changed, 164 insertions, 0 deletions

diff --git a/src/vpn/gnunet-daemon-vpn-dns.c b/src/vpn/gnunet-daemon-vpn-dns.c
new file mode 100644
index 000000000..d0b407667
--- /dev/null
+++ b/src/vpn/gnunet-daemon-vpn-dns.c
@@ -0,0 +1,164 @@
+/*
+     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);
+}
+