move network type logic out of ATS code, move performance preferences into MQ

1 files changed, 410 insertions, 0 deletions

diff --git a/src/nt/nt.c b/src/nt/nt.c
new file mode 100644
index 000000000..5764f8f4a
--- /dev/null
+++ b/src/nt/nt.c
@@ -0,0 +1,410 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2010-2015, 2018 GNUnet e.V.
+
+     GNUnet is free software: you can redistribute it and/or modify it
+     under the terms of the GNU Affero General Public License as published
+     by the Free Software Foundation, either version 3 of the License,
+     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
+     Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * @file nt/nt_api_scanner.c
+ * @brief LAN interface scanning to determine IPs in LAN
+ * @author Christian Grothoff
+ * @author Matthias Wachs
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_nt_lib.h"
+
+/**
+ * How frequently do we scan the interfaces for changes to the addresses?
+ */
+#define INTERFACE_PROCESSING_INTERVAL GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
+
+
+/**
+ * Convert a `enum GNUNET_NetworkType` to a string
+ *
+ * @param net the network type
+ * @return a string or NULL if invalid
+ */
+const char *
+GNUNET_NT_to_string (enum GNUNET_NetworkType net)
+{
+  switch (net)
+    {
+    case GNUNET_NT_UNSPECIFIED:
+      return "UNSPECIFIED";
+    case GNUNET_NT_LOOPBACK:
+      return "LOOPBACK";
+    case GNUNET_NT_LAN:
+      return "LAN";
+    case GNUNET_NT_WAN:
+      return "WAN";
+    case GNUNET_NT_WLAN:
+      return "WLAN";
+    case GNUNET_NT_BT:
+      return "BLUETOOTH";
+    default:
+      return NULL;
+    }
+}
+
+
+/**
+ * We keep a list of our local networks so we can answer
+ * LAN vs. WAN questions.  Note: WLAN is not detected yet.
+ * (maybe we can do that heuristically based on interface
+ * name in the future?).
+ */
+struct NT_Network
+{
+  /**
+   * Kept in a DLL.
+   */
+  struct NT_Network *next;
+
+  /**
+   * Kept in a DLL.
+   */
+  struct NT_Network *prev;
+
+  /**
+   * Network address.
+   */
+  struct sockaddr *network;
+
+  /**
+   * Netmask to determine what is in the LAN.
+   */
+  struct sockaddr *netmask;
+
+  /**
+   * How long are @e network and @e netmask?
+   */
+  socklen_t length;
+};
+
+
+/**
+ * Handle to the interface scanner.
+ */
+struct GNUNET_NT_InterfaceScanner
+{
+
+  /**
+   * Head of LAN networks list.
+   */
+  struct NT_Network *net_head;
+
+  /**
+   * Tail of LAN networks list.
+   */
+  struct NT_Network *net_tail;
+
+  /**
+   * Task for periodically refreshing our LAN network list.
+   */
+  struct GNUNET_SCHEDULER_Task *interface_task;
+
+};
+
+
+/**
+ * Delete all entries from the current network list.
+ *
+ * @param is scanner to clean up
+ */
+static void
+delete_networks (struct GNUNET_NT_InterfaceScanner *is)
+{
+  struct NT_Network *cur;
+
+  while (NULL != (cur = is->net_head))
+  {
+    GNUNET_CONTAINER_DLL_remove (is->net_head,
+                                 is->net_tail,
+                                 cur);
+    GNUNET_free (cur);
+  }
+}
+
+
+/**
+ * Function invoked for each interface found.  Adds the interface's
+ * network addresses to the respective DLL, so we can distinguish
+ * between LAN and WAN.
+ *
+ * @param cls closure with the `struct GNUNET_NT_InterfaceScanner`
+ * @param name name of the interface (can be NULL for unknown)
+ * @param isDefault is this presumably the default interface
+ * @param addr address of this interface (can be NULL for unknown or unassigned)
+ * @param broadcast_addr the broadcast address (can be NULL for unknown or unassigned)
+ * @param netmask the network mask (can be NULL for unknown or unassigned)
+ * @param addrlen length of the address
+ * @return #GNUNET_OK to continue iteration
+ */
+static int
+interface_proc (void *cls,
+                const char *name,
+                int isDefault,
+                const struct sockaddr *addr,
+                const struct sockaddr *broadcast_addr,
+                const struct sockaddr *netmask,
+                socklen_t addrlen)
+{
+  struct GNUNET_NT_InterfaceScanner *is = cls;
+  /* Calculate network */
+  struct NT_Network *net = NULL;
+
+  /* Skipping IPv4 loopback addresses since we have special check  */
+  if  (addr->sa_family == AF_INET)
+  {
+    const struct sockaddr_in *a4 = (const struct sockaddr_in *) addr;
+
+    if ((a4->sin_addr.s_addr & htonl(0xff000000)) == htonl (0x7f000000))
+       return GNUNET_OK;
+  }
+  /* Skipping IPv6 loopback addresses since we have special check  */
+  if  (addr->sa_family == AF_INET6)
+  {
+    const struct sockaddr_in6 *a6 = (const struct sockaddr_in6 *) addr;
+    if (IN6_IS_ADDR_LOOPBACK (&a6->sin6_addr))
+      return GNUNET_OK;
+  }
+
+  if (addr->sa_family == AF_INET)
+  {
+    const struct sockaddr_in *addr4 = (const struct sockaddr_in *) addr;
+    const struct sockaddr_in *netmask4 = (const struct sockaddr_in *) netmask;
+    struct sockaddr_in *tmp;
+    struct sockaddr_in network4;
+
+    net = GNUNET_malloc (sizeof (struct NT_Network) + 2 * sizeof (struct sockaddr_in));
+    tmp = (struct sockaddr_in *) &net[1];
+    net->network = (struct sockaddr *) &tmp[0];
+    net->netmask = (struct sockaddr *) &tmp[1];
+    net->length = addrlen;
+
+    memset (&network4, 0, sizeof (network4));
+    network4.sin_family = AF_INET;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+    network4.sin_len = sizeof (network4);
+#endif
+    network4.sin_addr.s_addr = (addr4->sin_addr.s_addr & netmask4->sin_addr.s_addr);
+
+    GNUNET_memcpy (net->netmask, netmask4, sizeof (struct sockaddr_in));
+    GNUNET_memcpy (net->network, &network4, sizeof (struct sockaddr_in));
+  }
+
+  if (addr->sa_family == AF_INET6)
+  {
+    const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6 *) addr;
+    const struct sockaddr_in6 *netmask6 = (const struct sockaddr_in6 *) netmask;
+    struct sockaddr_in6 * tmp;
+    struct sockaddr_in6 network6;
+
+    net = GNUNET_malloc (sizeof (struct NT_Network) + 2 * sizeof (struct sockaddr_in6));
+    tmp = (struct sockaddr_in6 *) &net[1];
+    net->network = (struct sockaddr *) &tmp[0];
+    net->netmask = (struct sockaddr *) &tmp[1];
+    net->length = addrlen;
+
+    memset (&network6, 0, sizeof (network6));
+    network6.sin6_family = AF_INET6;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+    network6.sin6_len = sizeof (network6);
+#endif
+    unsigned int c = 0;
+    uint32_t *addr_elem = (uint32_t *) &addr6->sin6_addr;
+    uint32_t *mask_elem = (uint32_t *) &netmask6->sin6_addr;
+    uint32_t *net_elem = (uint32_t *) &network6.sin6_addr;
+    for (c = 0; c < 4; c++)
+      net_elem[c] = addr_elem[c] & mask_elem[c];
+
+    GNUNET_memcpy (net->netmask, netmask6, sizeof (struct sockaddr_in6));
+    GNUNET_memcpy (net->network, &network6, sizeof (struct sockaddr_in6));
+  }
+  if (NULL == net)
+    return GNUNET_OK; /* odd / unsupported address family */
+
+  /* Store in list */
+#if VERBOSE_NT
+  char * netmask = GNUNET_strdup (GNUNET_a2s((struct sockaddr *) net->netmask, addrlen));
+  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
+                   "nt",
+                   "Adding network `%s', netmask `%s'\n",
+                   GNUNET_a2s ((struct sockaddr *) net->network,
+                               addrlen),
+                   netmask);
+  GNUNET_free (netmask);
+#endif
+  GNUNET_CONTAINER_DLL_insert (is->net_head,
+                               is->net_tail,
+                               net);
+
+  return GNUNET_OK;
+}
+
+
+/**
+ * Periodically get list of network addresses from our interfaces.
+ *
+ * @param cls closure
+ */
+static void
+get_addresses (void *cls)
+{
+  struct GNUNET_NT_InterfaceScanner *is = cls;
+
+  is->interface_task = NULL;
+  delete_networks (is);
+  GNUNET_OS_network_interfaces_list (&interface_proc,
+                                     is);
+  is->interface_task = GNUNET_SCHEDULER_add_delayed (INTERFACE_PROCESSING_INTERVAL,
+                                                     &get_addresses,
+                                                     is);
+}
+
+
+/**
+ * Returns where the address is located: LAN or WAN or ...
+ *
+ * @param is the interface scanner handle
+ * @param addr address
+ * @param addrlen address length
+ * @return type of the network the address belongs to
+ */
+enum GNUNET_NetworkType
+GNUNET_NT_scanner_address_get_type (struct GNUNET_NT_InterfaceScanner *is,
+                                    const struct sockaddr *addr,
+                                    socklen_t addrlen)
+{
+  struct NT_Network *cur = is->net_head;
+  enum GNUNET_NetworkType type = GNUNET_NT_UNSPECIFIED;
+
+  switch (addr->sa_family)
+    {
+    case AF_UNIX:
+      type = GNUNET_NT_LOOPBACK;
+      break;
+    case AF_INET:
+      {
+        const struct sockaddr_in *a4 = (const struct sockaddr_in *) addr;
+
+        if ((a4->sin_addr.s_addr & htonl(0xff000000)) == htonl (0x7f000000))
+          type = GNUNET_NT_LOOPBACK;
+        break;
+      }
+    case AF_INET6:
+      {
+        const struct sockaddr_in6 *a6 = (const struct sockaddr_in6 *) addr;
+
+        if (IN6_IS_ADDR_LOOPBACK (&a6->sin6_addr))
+          type = GNUNET_NT_LOOPBACK;
+        break;
+      }
+    default:
+      GNUNET_break (0);
+      break;
+   }
+
+  /* Check local networks */
+  while ((NULL != cur) && (GNUNET_NT_UNSPECIFIED == type))
+  {
+    if (addrlen != cur->length)
+    {
+      cur = cur->next;
+      continue;
+    }
+    if (addr->sa_family == AF_INET)
+    {
+      const struct sockaddr_in *a4 = (const struct sockaddr_in *) addr;
+      const struct sockaddr_in *net4 = (const struct sockaddr_in *) cur->network;
+      const struct sockaddr_in *mask4 = (const struct sockaddr_in *) cur->netmask;
+
+      if (((a4->sin_addr.s_addr & mask4->sin_addr.s_addr)) == net4->sin_addr.s_addr)
+        type = GNUNET_NT_LAN;
+    }
+    if (addr->sa_family == AF_INET6)
+    {
+      const struct sockaddr_in6 *a6 = (const struct sockaddr_in6 *) addr;
+      const struct sockaddr_in6 *net6 = (const struct sockaddr_in6 *) cur->network;
+      const struct sockaddr_in6 *mask6 = (const struct sockaddr_in6 *) cur->netmask;
+
+      int res = GNUNET_YES;
+      int c = 0;
+      uint32_t *addr_elem = (uint32_t *) &a6->sin6_addr;
+      uint32_t *mask_elem = (uint32_t *) &mask6->sin6_addr;
+      uint32_t *net_elem = (uint32_t *) &net6->sin6_addr;
+      for (c = 0; c < 4; c++)
+        if ((addr_elem[c] & mask_elem[c]) != net_elem[c])
+          res = GNUNET_NO;
+
+      if (res == GNUNET_YES)
+        type = GNUNET_NT_LAN;
+    }
+    cur = cur->next;
+  }
+
+  /* no local network found for this address, default: WAN */
+  if (type == GNUNET_NT_UNSPECIFIED)
+    type = GNUNET_NT_WAN;
+  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
+                   "nt-scanner-api",
+                   "`%s' is in network `%s'\n",
+                   GNUNET_a2s (addr,
+                               addrlen),
+                   GNUNET_NT_to_string (type));
+  return type;
+}
+
+
+/**
+ * Initialize the interface scanner.
+ *
+ * @return interface scanner
+ */
+struct GNUNET_NT_InterfaceScanner *
+GNUNET_NT_scanner_init ()
+{
+  struct GNUNET_NT_InterfaceScanner *is;
+
+  is = GNUNET_new (struct GNUNET_NT_InterfaceScanner);
+  GNUNET_OS_network_interfaces_list (&interface_proc,
+                                     is);
+  is->interface_task = GNUNET_SCHEDULER_add_delayed (INTERFACE_PROCESSING_INTERVAL,
+                                                     &get_addresses,
+                                                     is);
+  return is;
+}
+
+
+/**
+ * Client is done with the interface scanner, release resources.
+ *
+ * @param is handle to release
+ */
+void
+GNUNET_NT_scanner_done (struct GNUNET_NT_InterfaceScanner *is)
+{
+  if (NULL != is->interface_task)
+  {
+    GNUNET_SCHEDULER_cancel (is->interface_task);
+    is->interface_task = NULL;
+  }
+  delete_networks (is);
+  GNUNET_free (is);
+}
+
+
+/* end of nt.c */