|
@@ -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 */
|