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[GNUnet-SVN] [gnunet] branch master updated: move network type logic out


From: gnunet
Subject: [GNUnet-SVN] [gnunet] branch master updated: move network type logic out of ATS code, move performance preferences into MQ
Date: Thu, 22 Nov 2018 22:04:53 +0100

This is an automated email from the git hooks/post-receive script.

grothoff pushed a commit to branch master
in repository gnunet.

The following commit(s) were added to refs/heads/master by this push:
     new c87f73a07 move network type logic out of ATS code, move performance 
preferences into MQ
c87f73a07 is described below

commit c87f73a07df468eccedbe1fdfa82bdd5b633a0d5
Author: Christian Grothoff <address@hidden>
AuthorDate: Thu Nov 22 22:04:48 2018 +0100

    move network type logic out of ATS code, move performance preferences into 
MQ
---
 configure.ac                  |   3 +-
 po/POTFILES.in                |   2 +
 src/Makefile.am               |   7 +-
 src/ats/ats_api_performance.c |   2 +-
 src/include/Makefile.am       |   1 +
 src/include/gnunet_mq_lib.h   |  47 ++++-
 src/include/gnunet_nt_lib.h   | 123 +++++++++++++
 src/nt/Makefile.am            |  36 ++++
 src/nt/nt.c                   | 410 ++++++++++++++++++++++++++++++++++++++++++
 src/util/mq.c                 |  24 ++-
 10 files changed, 648 insertions(+), 7 deletions(-)

diff --git a/configure.ac b/configure.ac
index b43aa84be..35b2ef659 100644
--- a/configure.ac
+++ b/configure.ac
@@ -598,7 +598,7 @@ AC_CHECK_LIB(ogg, ogg_stream_flush_fill,
 PKG_CHECK_MODULES([GLIB],
                   [glib-2.0],
   [# check for pbc library
-  pbc=0 
+  pbc=0
    AC_CHECK_HEADER([pbc/pbc.h],pbc=1)
    AC_CHECK_HEADER([gabe.h],abe=1)
    AM_CONDITIONAL(HAVE_PBC, [test "x$pbc" = x1])
@@ -1807,6 +1807,7 @@ src/nat-auto/Makefile
 src/nat-auto/nat-auto.conf
 src/nse/Makefile
 src/nse/nse.conf
+src/nt/Makefile
 src/peerinfo/Makefile
 src/peerinfo/peerinfo.conf
 src/peerinfo-tool/Makefile
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 129c43cdd..a7d35588f 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -193,6 +193,7 @@ src/gns/w32nsp-uninstall.c
 src/hello/address.c
 src/hello/gnunet-hello.c
 src/hello/hello.c
+src/hello/hello-ng.c
 src/hostlist/gnunet-daemon-hostlist.c
 src/hostlist/gnunet-daemon-hostlist_client.c
 src/hostlist/gnunet-daemon-hostlist_server.c
@@ -250,6 +251,7 @@ src/nse/gnunet-nse.c
 src/nse/gnunet-nse-profiler.c
 src/nse/gnunet-service-nse.c
 src/nse/nse_api.c
+src/nt/nt.c
 src/peerinfo/gnunet-service-peerinfo.c
 src/peerinfo/peerinfo_api.c
 src/peerinfo/peerinfo_api_notify.c
diff --git a/src/Makefile.am b/src/Makefile.am
index 39cbaa893..5e2b0e493 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -16,7 +16,7 @@ if HAVE_EXPERIMENTAL
   psycutil \
   psycstore \
   psyc \
-  social 
+  social
 #  dv (FTBFS)
 if HAVE_ABE
 if HAVE_JSON
@@ -24,7 +24,7 @@ if HAVE_JSON
     abe \
     credential \
     reclaim-attribute \
-    reclaim 
+    reclaim
 endif
 endif
 if HAVE_JSON
@@ -80,6 +80,7 @@ else
 SUBDIRS = \
   include $(INTLEMU_SUBDIRS) \
   util \
+  nt \
   gnsrecord \
   hello \
   block \
@@ -129,6 +130,6 @@ SUBDIRS = \
        $(EXP_DIR) \
   $(JSON_DIR) \
   $(REST_DIR) \
-  integration-tests 
+  integration-tests
 
 endif
diff --git a/src/ats/ats_api_performance.c b/src/ats/ats_api_performance.c
index 0c196ea43..11e71e94e 100644
--- a/src/ats/ats_api_performance.c
+++ b/src/ats/ats_api_performance.c
@@ -11,7 +11,7 @@
   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/>.
  */
diff --git a/src/include/Makefile.am b/src/include/Makefile.am
index 41b2b1382..185f649ac 100644
--- a/src/include/Makefile.am
+++ b/src/include/Makefile.am
@@ -87,6 +87,7 @@ gnunetinclude_HEADERS = \
   gnunet_nc_lib.h \
   gnunet_network_lib.h \
   gnunet_nse_service.h \
+  gnunet_nt_lib.h \
   gnunet_op_lib.h \
   gnunet_os_lib.h \
   gnunet_peer_lib.h \
diff --git a/src/include/gnunet_mq_lib.h b/src/include/gnunet_mq_lib.h
index 226b3389f..3d3a74e3b 100644
--- a/src/include/gnunet_mq_lib.h
+++ b/src/include/gnunet_mq_lib.h
@@ -11,7 +11,7 @@
      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/>.
 */
@@ -875,6 +875,51 @@ const struct GNUNET_MessageHeader *
 GNUNET_MQ_impl_current (struct GNUNET_MQ_Handle *mq);
 
 
+
+/**
+ * Enum defining all known preference categories.
+ */
+enum GNUNET_MQ_PreferenceKind
+{
+
+  /**
+   * No preference was expressed.
+   */
+  GNUNET_MQ_PREFERENCE_NONE = 0,
+
+  /**
+   * The preferred transmission for this envelope focuses on
+   * maximizing bandwidth.
+   */
+  GNUNET_MQ_PREFERENCE_BANDWIDTH = 1,
+
+  /**
+   * The preferred transmission for this envelope foces on
+   * minimizing latency.
+   */
+  GNUNET_MQ_PREFERENCE_LATENCY = 2,
+
+  /**
+   * The preferred transmission for this envelope foces on
+   * reliability.
+   */
+  GNUNET_MQ_PREFERENCE_RELIABILITY = 3
+
+};
+
+
+/**
+ * Convert an `enum GNUNET_MQ_PreferenceType` to a string
+ *
+ * @param type the preference type
+ * @return a string or NULL if invalid
+ */
+const char *
+GNUNET_MQ_preference_to_string (enum GNUNET_MQ_PreferenceKind type);
+
+
+
+
 #endif
 
 /** @} */ /* end of group mq */
diff --git a/src/include/gnunet_nt_lib.h b/src/include/gnunet_nt_lib.h
new file mode 100644
index 000000000..3d89aa7b2
--- /dev/null
+++ b/src/include/gnunet_nt_lib.h
@@ -0,0 +1,123 @@
+/*
+ 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 network type characterization
+ * @author Christian Grothoff
+ * @author Matthias Wachs
+ *
+ * @defgroup nt  network type characterization
+ *
+ * @{
+ */
+#ifndef GNUNET_NT_LIB_H
+#define GNUNET_NT_LIB_H
+
+/**
+ * Types of networks (with separate quotas) we support.
+ */
+enum GNUNET_NetworkType
+{
+  /**
+   * Category of last resort.
+   */
+  GNUNET_NT_UNSPECIFIED = 0,
+
+  /**
+   * Loopback (same host).
+   */
+  GNUNET_NT_LOOPBACK = 1,
+
+  /**
+   * Local area network.
+   */
+  GNUNET_NT_LAN = 2,
+
+  /**
+   * Wide area network (i.e. Internet)
+   */
+  GNUNET_NT_WAN = 3,
+
+  /**
+   * Wireless LAN (i.e. 802.11abgn)
+   */
+  GNUNET_NT_WLAN = 4,
+
+  /**
+   * Bluetooth LAN
+   */
+  GNUNET_NT_BT = 5
+
+/**
+ * Number of network types supported by ATS
+ */
+#define GNUNET_NT_COUNT 6
+
+};
+
+
+/**
+ * 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);
+
+
+/**
+ * Handle for the LAN Characterization library.
+ */
+struct GNUNET_NT_InterfaceScanner;
+
+
+/**
+ * Returns where the address is located: loopback, LAN or WAN.
+ *
+ * @param is handle from #GNUNET_ATS_interface_scanner_init()
+ * @param addr address
+ * @param addrlen address length
+ * @return type of the network the address belongs to
+ */
+enum GNUNET_NetworkType
+GNUNET_NT_scanner_get_type (struct GNUNET_NT_InterfaceScanner *is,
+                            const struct sockaddr *addr,
+                            socklen_t addrlen);
+
+
+/**
+ * Initialize the address characterization client handle.
+ *
+ * @return scanner handle, NULL on error
+ */
+struct GNUNET_NT_InterfaceScanner *
+GNUNET_NT_scanner_init (void);
+
+
+/**
+ * Terminate interface scanner.
+ *
+ * @param is scanner we are done with
+ */
+void
+GNUNET_NT_scanner_done (struct GNUNET_NT_InterfaceScanner *is);
+
+
+#endif
+
+/** @} */  /* end of group */
diff --git a/src/nt/Makefile.am b/src/nt/Makefile.am
new file mode 100644
index 000000000..68b6a55e7
--- /dev/null
+++ b/src/nt/Makefile.am
@@ -0,0 +1,36 @@
+# This Makefile.am is in the public domain
+AM_CPPFLAGS = -I$(top_srcdir)/src/include
+
+if MINGW
+  WINFLAGS = -Wl,--no-undefined -Wl,--export-all-symbols
+endif
+
+if USE_COVERAGE
+  AM_CFLAGS = --coverage
+endif
+
+lib_LTLIBRARIES = libgnunetnt.la
+
+libgnunetnt_la_SOURCES = \
+  nt.c
+
+libgnunetnt_la_LIBADD = \
+ $(top_builddir)/src/util/libgnunetutil.la
+libgnunetnt_la_LDFLAGS = \
+ $(GN_LIB_LDFLAGS) \
+  -version-info 0:0:0
+
+#if ENABLE_TEST_RUN
+#TESTS = \
+# test_nt
+#endif
+
+#check_PROGRAMS= \
+# test_nt
+#
+#test_nt_SOURCES = \
+#  test_nt.c
+#test_nt_LDADD = \
+#  libgnunetnt.la \
+#  $(top_builddir)/src/util/libgnunetutil.la  \
+#   $(XLIB)
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 */
diff --git a/src/util/mq.c b/src/util/mq.c
index eaac85575..8bf1f9752 100644
--- a/src/util/mq.c
+++ b/src/util/mq.c
@@ -11,7 +11,7 @@
      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/>.
 */
@@ -1270,5 +1270,27 @@ GNUNET_MQ_count_handlers (const struct 
GNUNET_MQ_MessageHandler *handlers)
 }
 
 
+/**
+ * Convert an `enum GNUNET_MQ_PreferenceType` to a string
+ *
+ * @param type the preference type
+ * @return a string or NULL if invalid
+ */
+const char *
+GNUNET_MQ_preference_to_string (enum GNUNET_MQ_PreferenceKind type)
+{
+  switch (type) {
+  case GNUNET_MQ_PREFERENCE_NONE:
+    return "NONE";
+  case GNUNET_MQ_PREFERENCE_BANDWIDTH:
+    return "BANDWIDTH";
+  case GNUNET_MQ_PREFERENCE_LATENCY:
+    return "LATENCY";
+  case GNUNET_MQ_PREFERENCE_RELIABILITY:
+    return "RELIABILITY";
+  };
+  return NULL;
+}
+
 
 /* end of mq.c */

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