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-rw-r--r--openvpn/tun.c3446
1 files changed, 3446 insertions, 0 deletions
diff --git a/openvpn/tun.c b/openvpn/tun.c
new file mode 100644
index 0000000..e904a0c
--- /dev/null
+++ b/openvpn/tun.c
@@ -0,0 +1,3446 @@
+/*
+ * OpenVPN -- An application to securely tunnel IP networks
+ * over a single TCP/UDP port, with support for SSL/TLS-based
+ * session authentication and key exchange,
+ * packet encryption, packet authentication, and
+ * packet compression.
+ *
+ * Copyright (C) 2002-2005 OpenVPN Solutions LLC <info@openvpn.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program 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 this program (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*
+ * Support routines for configuring and accessing TUN/TAP
+ * virtual network adapters.
+ *
+ * This file is based on the TUN/TAP driver interface routines
+ * from VTun by Maxim Krasnyansky <max_mk@yahoo.com>.
+ */
+
+#ifdef WIN32
+#include "config-win32.h"
+#else
+#include "config.h"
+#endif
+
+#include "syshead.h"
+
+#include "tun.h"
+#include "fdmisc.h"
+#include "common.h"
+#include "misc.h"
+#include "socket.h"
+#include "manage.h"
+
+#include "memdbg.h"
+
+#ifdef TARGET_SOLARIS
+static void solaris_error_close (struct tuntap *tt, const struct env_set *es, const char *actual);
+#endif
+
+bool
+is_dev_type (const char *dev, const char *dev_type, const char *match_type)
+{
+ ASSERT (match_type);
+ if (!dev)
+ return false;
+ if (dev_type)
+ return !strcmp (dev_type, match_type);
+ else
+ return !strncmp (dev, match_type, strlen (match_type));
+}
+
+int
+dev_type_enum (const char *dev, const char *dev_type)
+{
+ if (is_dev_type (dev, dev_type, "tun"))
+ return DEV_TYPE_TUN;
+ else if (is_dev_type (dev, dev_type, "tap"))
+ return DEV_TYPE_TAP;
+ else if (is_dev_type (dev, dev_type, "null"))
+ return DEV_TYPE_NULL;
+ else
+ return DEV_TYPE_UNDEF;
+}
+
+const char *
+dev_type_string (const char *dev, const char *dev_type)
+{
+ switch (dev_type_enum (dev, dev_type))
+ {
+ case DEV_TYPE_TUN:
+ return "tun";
+ case DEV_TYPE_TAP:
+ return "tap";
+ case DEV_TYPE_NULL:
+ return "null";
+ default:
+ return "[unknown-dev-type]";
+ }
+}
+
+const char *
+dev_component_in_dev_node (const char *dev_node)
+{
+ const char *ret;
+ const int dirsep = OS_SPECIFIC_DIRSEP;
+
+ if (dev_node)
+ {
+ ret = strrchr (dev_node, dirsep);
+ if (ret && *ret)
+ ++ret;
+ else
+ ret = dev_node;
+ if (*ret)
+ return ret;
+ }
+ return NULL;
+}
+
+/*
+ * Try to predict the actual TUN/TAP device instance name,
+ * before the device is actually opened.
+ */
+const char *
+guess_tuntap_dev (const char *dev,
+ const char *dev_type,
+ const char *dev_node,
+ struct gc_arena *gc)
+{
+#ifdef WIN32
+ const int dt = dev_type_enum (dev, dev_type);
+ if (dt == DEV_TYPE_TUN || dt == DEV_TYPE_TAP)
+ {
+ return get_netsh_id (dev_node, gc);
+ }
+#endif
+
+ /* default case */
+ return dev;
+}
+
+/*
+ * Called by the open_tun function of OSes to check if we
+ * explicitly support IPv6.
+ *
+ * In this context, explicit means that the OS expects us to
+ * do something special to the tun socket in order to support
+ * IPv6, i.e. it is not transparent.
+ *
+ * ipv6_explicitly_supported should be set to false if we don't
+ * have any explicit IPv6 code in the tun device handler.
+ *
+ * If ipv6_explicitly_supported is true, then we have explicit
+ * OS-specific tun dev code for handling IPv6. If so, tt->ipv6
+ * is set according to the --tun-ipv6 command line option.
+ */
+static void
+ipv6_support (bool ipv6, bool ipv6_explicitly_supported, struct tuntap* tt)
+{
+ tt->ipv6 = false;
+ if (ipv6_explicitly_supported)
+ tt->ipv6 = ipv6;
+ else if (ipv6)
+ msg (M_WARN, "NOTE: explicit support for IPv6 tun devices is not provided for this OS");
+}
+
+/* --ifconfig-nowarn disables some options sanity checking */
+static const char ifconfig_warn_how_to_silence[] = "(silence this warning with --ifconfig-nowarn)";
+
+/*
+ * If !tun, make sure ifconfig_remote_netmask looks
+ * like a netmask.
+ *
+ * If tun, make sure ifconfig_remote_netmask looks
+ * like an IPv4 address.
+ */
+static void
+ifconfig_sanity_check (bool tun, in_addr_t addr)
+{
+ struct gc_arena gc = gc_new ();
+ const bool looks_like_netmask = ((addr & 0xFF000000) == 0xFF000000);
+ if (tun)
+ {
+ if (looks_like_netmask)
+ msg (M_WARN, "WARNING: Since you are using --dev tun, the second argument to --ifconfig must be an IP address. You are using something (%s) that looks more like a netmask. %s",
+ print_in_addr_t (addr, 0, &gc),
+ ifconfig_warn_how_to_silence);
+ }
+ else /* tap */
+ {
+ if (!looks_like_netmask)
+ msg (M_WARN, "WARNING: Since you are using --dev tap, the second argument to --ifconfig must be a netmask, for example something like 255.255.255.0. %s",
+ ifconfig_warn_how_to_silence);
+ }
+ gc_free (&gc);
+}
+
+/*
+ * For TAP-style devices, generate a broadcast address.
+ */
+static in_addr_t
+generate_ifconfig_broadcast_addr (in_addr_t local,
+ in_addr_t netmask)
+{
+ return local | ~netmask;
+}
+
+/*
+ * Check that --local and --remote addresses do not
+ * clash with ifconfig addresses or subnet.
+ */
+static void
+check_addr_clash (const char *name,
+ int type,
+ in_addr_t public,
+ in_addr_t local,
+ in_addr_t remote_netmask)
+{
+ struct gc_arena gc = gc_new ();
+#if 0
+ msg (M_INFO, "CHECK_ADDR_CLASH type=%d public=%s local=%s, remote_netmask=%s",
+ type,
+ print_in_addr_t (public, 0, &gc),
+ print_in_addr_t (local, 0, &gc),
+ print_in_addr_t (remote_netmask, 0, &gc));
+#endif
+
+ if (public)
+ {
+ if (type == DEV_TYPE_TUN)
+ {
+ const in_addr_t test_netmask = 0xFFFFFF00;
+ const in_addr_t public_net = public & test_netmask;
+ const in_addr_t local_net = local & test_netmask;
+ const in_addr_t remote_net = remote_netmask & test_netmask;
+
+ if (public == local || public == remote_netmask)
+ msg (M_WARN,
+ "WARNING: --%s address [%s] conflicts with --ifconfig address pair [%s, %s]. %s",
+ name,
+ print_in_addr_t (public, 0, &gc),
+ print_in_addr_t (local, 0, &gc),
+ print_in_addr_t (remote_netmask, 0, &gc),
+ ifconfig_warn_how_to_silence);
+
+ if (public_net == local_net || public_net == remote_net)
+ msg (M_WARN,
+ "WARNING: potential conflict between --%s address [%s] and --ifconfig address pair [%s, %s] -- this is a warning only that is triggered when local/remote addresses exist within the same /24 subnet as --ifconfig endpoints. %s",
+ name,
+ print_in_addr_t (public, 0, &gc),
+ print_in_addr_t (local, 0, &gc),
+ print_in_addr_t (remote_netmask, 0, &gc),
+ ifconfig_warn_how_to_silence);
+ }
+ else if (type == DEV_TYPE_TAP)
+ {
+ const in_addr_t public_network = public & remote_netmask;
+ const in_addr_t virtual_network = local & remote_netmask;
+ if (public_network == virtual_network)
+ msg (M_WARN,
+ "WARNING: --%s address [%s] conflicts with --ifconfig subnet [%s, %s] -- local and remote addresses cannot be inside of the --ifconfig subnet. %s",
+ name,
+ print_in_addr_t (public, 0, &gc),
+ print_in_addr_t (local, 0, &gc),
+ print_in_addr_t (remote_netmask, 0, &gc),
+ ifconfig_warn_how_to_silence);
+ }
+ }
+ gc_free (&gc);
+}
+
+/*
+ * Complain if --dev tap and --ifconfig is used on an OS for which
+ * we don't have a custom tap ifconfig template below.
+ */
+static void
+no_tap_ifconfig ()
+{
+ msg (M_FATAL, "Sorry but you cannot use --dev tap and --ifconfig together on this OS because I have not yet been programmed to understand the appropriate ifconfig syntax to use for TAP-style devices on this OS. Your best alternative is to use an --up script and do the ifconfig command manually.");
+}
+
+/*
+ * Return a string to be used for options compatibility check
+ * between peers.
+ */
+const char *
+ifconfig_options_string (const struct tuntap* tt, bool remote, bool disable, struct gc_arena *gc)
+{
+ struct buffer out = alloc_buf_gc (256, gc);
+ if (tt->did_ifconfig_setup && !disable)
+ {
+ if (tt->type == DEV_TYPE_TUN)
+ {
+ const char *l, *r;
+ if (remote)
+ {
+ r = print_in_addr_t (tt->local, 0, gc);
+ l = print_in_addr_t (tt->remote_netmask, 0, gc);
+ }
+ else
+ {
+ l = print_in_addr_t (tt->local, 0, gc);
+ r = print_in_addr_t (tt->remote_netmask, 0, gc);
+ }
+ buf_printf (&out, "%s %s", r, l);
+ }
+ else if (tt->type == DEV_TYPE_TAP)
+ {
+ buf_printf (&out, "%s %s",
+ print_in_addr_t (tt->local & tt->remote_netmask, 0, gc),
+ print_in_addr_t (tt->remote_netmask, 0, gc));
+ }
+ else
+ buf_printf (&out, "[undef]");
+ }
+ return BSTR (&out);
+}
+
+/*
+ * Return a status string describing wait state.
+ */
+const char *
+tun_stat (const struct tuntap *tt, unsigned int rwflags, struct gc_arena *gc)
+{
+ struct buffer out = alloc_buf_gc (64, gc);
+ if (tt)
+ {
+ if (rwflags & EVENT_READ)
+ {
+ buf_printf (&out, "T%s",
+ (tt->rwflags_debug & EVENT_READ) ? "R" : "r");
+#ifdef WIN32
+ buf_printf (&out, "%s",
+ overlapped_io_state_ascii (&tt->reads));
+#endif
+ }
+ if (rwflags & EVENT_WRITE)
+ {
+ buf_printf (&out, "T%s",
+ (tt->rwflags_debug & EVENT_WRITE) ? "W" : "w");
+#ifdef WIN32
+ buf_printf (&out, "%s",
+ overlapped_io_state_ascii (&tt->writes));
+#endif
+ }
+ }
+ else
+ {
+ buf_printf (&out, "T?");
+ }
+ return BSTR (&out);
+}
+
+/*
+ * Init tun/tap object.
+ *
+ * Set up tuntap structure for ifconfig,
+ * but don't execute yet.
+ */
+struct tuntap *
+init_tun (const char *dev, /* --dev option */
+ const char *dev_type, /* --dev-type option */
+ const char *ifconfig_local_parm, /* --ifconfig parm 1 */
+ const char *ifconfig_remote_netmask_parm, /* --ifconfig parm 2 */
+ in_addr_t local_public,
+ in_addr_t remote_public,
+ const bool strict_warn,
+ struct env_set *es)
+{
+ struct gc_arena gc = gc_new ();
+ struct tuntap *tt;
+
+ ALLOC_OBJ (tt, struct tuntap);
+ clear_tuntap (tt);
+
+ tt->type = dev_type_enum (dev, dev_type);
+
+ if (ifconfig_local_parm && ifconfig_remote_netmask_parm)
+ {
+ bool tun = false;
+ const char *ifconfig_local = NULL;
+ const char *ifconfig_remote_netmask = NULL;
+ const char *ifconfig_broadcast = NULL;
+
+ /*
+ * We only handle TUN/TAP devices here, not --dev null devices.
+ */
+ if (tt->type == DEV_TYPE_TUN)
+ tun = true;
+ else if (tt->type == DEV_TYPE_TAP)
+ tun = false;
+ else
+ msg (M_FATAL, "'%s' is not a TUN/TAP device. The --ifconfig option works only for TUN/TAP devices.", dev);
+
+ /*
+ * Convert arguments to binary IPv4 addresses.
+ */
+
+ tt->local = getaddr (
+ GETADDR_RESOLVE
+ | GETADDR_HOST_ORDER
+ | GETADDR_FATAL_ON_SIGNAL
+ | GETADDR_FATAL,
+ ifconfig_local_parm,
+ 0,
+ NULL,
+ NULL);
+
+ tt->remote_netmask = getaddr (
+ (tun ? GETADDR_RESOLVE : 0)
+ | GETADDR_HOST_ORDER
+ | GETADDR_FATAL_ON_SIGNAL
+ | GETADDR_FATAL,
+ ifconfig_remote_netmask_parm,
+ 0,
+ NULL,
+ NULL);
+
+ /*
+ * Look for common errors in --ifconfig parms
+ */
+ if (strict_warn)
+ {
+ ifconfig_sanity_check (tun, tt->remote_netmask);
+
+ /*
+ * If local_public or remote_public addresses are defined,
+ * make sure they do not clash with our virtual subnet.
+ */
+
+ check_addr_clash ("local",
+ tt->type,
+ local_public,
+ tt->local,
+ tt->remote_netmask);
+
+ check_addr_clash ("remote",
+ tt->type,
+ remote_public,
+ tt->local,
+ tt->remote_netmask);
+ }
+
+ /*
+ * Set ifconfig parameters
+ */
+ ifconfig_local = print_in_addr_t (tt->local, 0, &gc);
+ ifconfig_remote_netmask = print_in_addr_t (tt->remote_netmask, 0, &gc);
+
+ /*
+ * If TAP-style interface, generate broadcast address.
+ */
+ if (!tun)
+ {
+ tt->broadcast = generate_ifconfig_broadcast_addr (tt->local, tt->remote_netmask);
+ ifconfig_broadcast = print_in_addr_t (tt->broadcast, 0, &gc);
+ }
+
+ /*
+ * Set environmental variables with ifconfig parameters.
+ */
+ if (es)
+ {
+ setenv_str (es, "ifconfig_local", ifconfig_local);
+ if (tun)
+ {
+ setenv_str (es, "ifconfig_remote", ifconfig_remote_netmask);
+ }
+ else
+ {
+ setenv_str (es, "ifconfig_netmask", ifconfig_remote_netmask);
+ setenv_str (es, "ifconfig_broadcast", ifconfig_broadcast);
+ }
+ }
+
+ tt->did_ifconfig_setup = true;
+ }
+ gc_free (&gc);
+ return tt;
+}
+
+/*
+ * Platform specific tun initializations
+ */
+void
+init_tun_post (struct tuntap *tt,
+ const struct frame *frame,
+ const struct tuntap_options *options)
+{
+ tt->options = *options;
+#ifdef WIN32
+ overlapped_io_init (&tt->reads, frame, FALSE, true);
+ overlapped_io_init (&tt->writes, frame, TRUE, true);
+ tt->rw_handle.read = tt->reads.overlapped.hEvent;
+ tt->rw_handle.write = tt->writes.overlapped.hEvent;
+ tt->adapter_index = ~0;
+#endif
+}
+
+/* execute the ifconfig command through the shell */
+void
+do_ifconfig (struct tuntap *tt,
+ const char *actual, /* actual device name */
+ int tun_mtu,
+ const struct env_set *es)
+{
+ struct gc_arena gc = gc_new ();
+
+ if (tt->did_ifconfig_setup)
+ {
+ bool tun = false;
+ const char *ifconfig_local = NULL;
+ const char *ifconfig_remote_netmask = NULL;
+ const char *ifconfig_broadcast = NULL;
+ char command_line[256];
+
+ /*
+ * We only handle TUN/TAP devices here, not --dev null devices.
+ */
+ if (tt->type == DEV_TYPE_TUN)
+ tun = true;
+ else if (tt->type == DEV_TYPE_TAP)
+ tun = false;
+ else
+ ASSERT (0); /* should have been caught in init_tun */
+
+ /*
+ * Set ifconfig parameters
+ */
+ ifconfig_local = print_in_addr_t (tt->local, 0, &gc);
+ ifconfig_remote_netmask = print_in_addr_t (tt->remote_netmask, 0, &gc);
+
+ /*
+ * If TAP-style device, generate broadcast address.
+ */
+ if (!tun)
+ ifconfig_broadcast = print_in_addr_t (tt->broadcast, 0, &gc);
+
+#ifdef ENABLE_MANAGEMENT
+ if (management)
+ {
+ management_set_state (management,
+ OPENVPN_STATE_ASSIGN_IP,
+ NULL,
+ tt->local);
+ }
+#endif
+
+
+#if defined(TARGET_LINUX)
+#ifdef CONFIG_FEATURE_IPROUTE
+ /*
+ * Set the MTU for the device
+ */
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IPROUTE_PATH " link set dev %s up mtu %d",
+ actual,
+ tun_mtu
+ );
+ msg (M_INFO, "%s", command_line);
+ system_check (command_line, es, S_FATAL, "Linux ip link set failed");
+
+ if (tun) {
+
+ /*
+ * Set the address for the device
+ */
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IPROUTE_PATH " addr add dev %s local %s peer %s",
+ actual,
+ ifconfig_local,
+ ifconfig_remote_netmask
+ );
+ msg (M_INFO, "%s", command_line);
+ system_check (command_line, es, S_FATAL, "Linux ip addr add failed");
+ } else {
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IPROUTE_PATH " addr add dev %s %s/%d broadcast %s",
+ actual,
+ ifconfig_local,
+ count_netmask_bits(ifconfig_remote_netmask),
+ ifconfig_broadcast
+ );
+ msg (M_INFO, "%s", command_line);
+ system_check (command_line, es, S_FATAL, "Linux ip addr add failed");
+ }
+ tt->did_ifconfig = true;
+#else
+ if (tun)
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IFCONFIG_PATH " %s %s pointopoint %s mtu %d",
+ actual,
+ ifconfig_local,
+ ifconfig_remote_netmask,
+ tun_mtu
+ );
+ else
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IFCONFIG_PATH " %s %s netmask %s mtu %d broadcast %s",
+ actual,
+ ifconfig_local,
+ ifconfig_remote_netmask,
+ tun_mtu,
+ ifconfig_broadcast
+ );
+ msg (M_INFO, "%s", command_line);
+ system_check (command_line, es, S_FATAL, "Linux ifconfig failed");
+ tt->did_ifconfig = true;
+
+#endif /*CONFIG_FEATURE_IPROUTE*/
+#elif defined(TARGET_SOLARIS)
+
+ /* Solaris 2.6 (and 7?) cannot set all parameters in one go...
+ * example:
+ * ifconfig tun2 10.2.0.2 10.2.0.1 mtu 1450 up
+ * ifconfig tun2 netmask 255.255.255.255
+ */
+ if (tun)
+ {
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IFCONFIG_PATH " %s %s %s mtu %d up",
+ actual,
+ ifconfig_local,
+ ifconfig_remote_netmask,
+ tun_mtu
+ );
+
+ msg (M_INFO, "%s", command_line);
+ if (!system_check (command_line, es, 0, "Solaris ifconfig phase-1 failed"))
+ solaris_error_close (tt, es, actual);
+
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IFCONFIG_PATH " %s netmask 255.255.255.255",
+ actual
+ );
+ }
+ else
+ no_tap_ifconfig ();
+
+ msg (M_INFO, "%s", command_line);
+ if (!system_check (command_line, es, 0, "Solaris ifconfig phase-2 failed"))
+ solaris_error_close (tt, es, actual);
+
+ tt->did_ifconfig = true;
+
+#elif defined(TARGET_OPENBSD)
+
+ /*
+ * OpenBSD tun devices appear to be persistent by default. It seems in order
+ * to make this work correctly, we need to delete the previous instance
+ * (if it exists), and re-ifconfig. Let me know if you know a better way.
+ */
+
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IFCONFIG_PATH " %s destroy",
+ actual);
+ msg (M_INFO, "%s", command_line);
+ system_check (command_line, es, 0, NULL);
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IFCONFIG_PATH " %s create",
+ actual);
+ msg (M_INFO, "%s", command_line);
+ system_check (command_line, es, 0, NULL);
+ msg (M_INFO, "NOTE: Tried to delete pre-existing tun/tap instance -- No Problem if failure");
+
+ /* example: ifconfig tun2 10.2.0.2 10.2.0.1 mtu 1450 netmask 255.255.255.255 up */
+ if (tun)
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IFCONFIG_PATH " %s %s %s mtu %d netmask 255.255.255.255 up",
+ actual,
+ ifconfig_local,
+ ifconfig_remote_netmask,
+ tun_mtu
+ );
+ else
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IFCONFIG_PATH " %s %s netmask %s mtu %d broadcast %s link0",
+ actual,
+ ifconfig_local,
+ ifconfig_remote_netmask,
+ tun_mtu,
+ ifconfig_broadcast
+ );
+ msg (M_INFO, "%s", command_line);
+ system_check (command_line, es, S_FATAL, "OpenBSD ifconfig failed");
+ tt->did_ifconfig = true;
+
+#elif defined(TARGET_NETBSD)
+
+ if (tun)
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IFCONFIG_PATH " %s %s %s mtu %d netmask 255.255.255.255 up",
+ actual,
+ ifconfig_local,
+ ifconfig_remote_netmask,
+ tun_mtu
+ );
+ else
+ /*
+ * NetBSD has distinct tun and tap devices
+ * so we don't need the "link0" extra parameter to specify we want to do
+ * tunneling at the ethernet level
+ */
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IFCONFIG_PATH " %s %s netmask %s mtu %d broadcast %s",
+ actual,
+ ifconfig_local,
+ ifconfig_remote_netmask,
+ tun_mtu,
+ ifconfig_broadcast
+ );
+ msg (M_INFO, "%s", command_line);
+ system_check (command_line, es, S_FATAL, "NetBSD ifconfig failed");
+ tt->did_ifconfig = true;
+
+#elif defined(TARGET_DARWIN)
+
+ /*
+ * Darwin (i.e. Mac OS X) seems to exhibit similar behaviour to OpenBSD...
+ */
+
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IFCONFIG_PATH " %s delete",
+ actual);
+ msg (M_INFO, "%s", command_line);
+ system_check (command_line, es, 0, NULL);
+ msg (M_INFO, "NOTE: Tried to delete pre-existing tun/tap instance -- No Problem if failure");
+
+
+ /* example: ifconfig tun2 10.2.0.2 10.2.0.1 mtu 1450 netmask 255.255.255.255 up */
+ if (tun)
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IFCONFIG_PATH " %s %s %s mtu %d netmask 255.255.255.255 up",
+ actual,
+ ifconfig_local,
+ ifconfig_remote_netmask,
+ tun_mtu
+ );
+ else
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IFCONFIG_PATH " %s %s netmask %s mtu %d up",
+ actual,
+ ifconfig_local,
+ ifconfig_remote_netmask,
+ tun_mtu
+ );
+
+ msg (M_INFO, "%s", command_line);
+ system_check (command_line, es, S_FATAL, "Mac OS X ifconfig failed");
+ tt->did_ifconfig = true;
+
+#elif defined(TARGET_FREEBSD)
+
+ /* example: ifconfig tun2 10.2.0.2 10.2.0.1 mtu 1450 netmask 255.255.255.255 up */
+ if (tun)
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IFCONFIG_PATH " %s %s %s mtu %d netmask 255.255.255.255 up",
+ actual,
+ ifconfig_local,
+ ifconfig_remote_netmask,
+ tun_mtu
+ );
+ else
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IFCONFIG_PATH " %s %s netmask %s mtu %d up",
+ actual,
+ ifconfig_local,
+ ifconfig_remote_netmask,
+ tun_mtu
+ );
+
+ msg (M_INFO, "%s", command_line);
+ system_check (command_line, es, S_FATAL, "FreeBSD ifconfig failed");
+ tt->did_ifconfig = true;
+
+#elif defined (WIN32)
+ {
+ const char *netmask;
+
+ /*
+ * Make sure that both ifconfig addresses are part of the
+ * same .252 subnet.
+ */
+ if (tun)
+ {
+ verify_255_255_255_252 (tt->local, tt->remote_netmask);
+ tt->adapter_netmask = ~3;
+ netmask = print_in_addr_t (tt->adapter_netmask, 0, &gc);
+ }
+ else
+ {
+ netmask = ifconfig_remote_netmask;
+ tt->adapter_netmask = tt->remote_netmask;
+ }
+
+ /* example: netsh interface ip set address my-tap static 10.3.0.1 255.255.255.0 */
+ openvpn_snprintf (command_line, sizeof (command_line),
+ "netsh interface ip set address \"%s\" static %s %s",
+ actual,
+ ifconfig_local,
+ netmask);
+
+ switch (tt->options.ip_win32_type)
+ {
+ case IPW32_SET_MANUAL:
+ msg (M_INFO, "******** NOTE: Please manually set the IP/netmask of '%s' to %s/%s (if it is not already set)",
+ actual,
+ ifconfig_local,
+ netmask);
+ break;
+ case IPW32_SET_NETSH:
+ if (!strcmp (actual, "NULL"))
+ msg (M_FATAL, "Error: When using --ip-win32 netsh, if you have more than one TAP-Win32 adapter, you must also specify --dev-node");
+ netcmd_semaphore_lock ();
+ msg (M_INFO, "%s", command_line);
+ system_check (command_line, es, S_FATAL, "ERROR: netsh command failed");
+ netcmd_semaphore_release ();
+ break;
+ }
+ tt->did_ifconfig = true;
+ }
+
+#else
+ msg (M_FATAL, "Sorry, but I don't know how to do 'ifconfig' commands on this operating system. You should ifconfig your TUN/TAP device manually or use an --up script.");
+#endif
+ }
+ gc_free (&gc);
+}
+
+void
+clear_tuntap (struct tuntap *tuntap)
+{
+ CLEAR (*tuntap);
+#ifdef WIN32
+ tuntap->hand = NULL;
+#else
+ tuntap->fd = -1;
+#endif
+#ifdef TARGET_SOLARIS
+ tuntap->ip_fd = -1;
+#endif
+ tuntap->ipv6 = false;
+}
+
+static void
+open_null (struct tuntap *tt)
+{
+ tt->actual_name = string_alloc ("null", NULL);
+}
+
+#ifndef WIN32
+static void
+open_tun_generic (const char *dev, const char *dev_type, const char *dev_node,
+ bool ipv6, bool ipv6_explicitly_supported, bool dynamic,
+ struct tuntap *tt)
+{
+ char tunname[256];
+ char dynamic_name[256];
+ bool dynamic_opened = false;
+
+ ipv6_support (ipv6, ipv6_explicitly_supported, tt);
+
+ if (tt->type == DEV_TYPE_NULL)
+ {
+ open_null (tt);
+ }
+ else
+ {
+ /*
+ * --dev-node specified, so open an explicit device node
+ */
+ if (dev_node)
+ {
+ openvpn_snprintf (tunname, sizeof (tunname), "%s", dev_node);
+ }
+ else
+ {
+ /*
+ * dynamic open is indicated by --dev specified without
+ * explicit unit number. Try opening /dev/[dev]n
+ * where n = [0, 255].
+ */
+ if (dynamic && !has_digit(dev))
+ {
+ int i;
+ for (i = 0; i < 256; ++i)
+ {
+ openvpn_snprintf (tunname, sizeof (tunname),
+ "/dev/%s%d", dev, i);
+ openvpn_snprintf (dynamic_name, sizeof (dynamic_name),
+ "%s%d", dev, i);
+ if ((tt->fd = open (tunname, O_RDWR)) > 0)
+ {
+ dynamic_opened = true;
+ break;
+ }
+ msg (D_READ_WRITE | M_ERRNO, "Tried opening %s (failed)", tunname);
+ }
+ if (!dynamic_opened)
+ msg (M_FATAL, "Cannot allocate TUN/TAP dev dynamically");
+ }
+ /*
+ * explicit unit number specified
+ */
+ else
+ {
+ openvpn_snprintf (tunname, sizeof (tunname), "/dev/%s", dev);
+ }
+ }
+
+ if (!dynamic_opened)
+ {
+ if ((tt->fd = open (tunname, O_RDWR)) < 0)
+ msg (M_ERR, "Cannot open TUN/TAP dev %s", tunname);
+ }
+
+ set_nonblock (tt->fd);
+ set_cloexec (tt->fd); /* don't pass fd to scripts */
+ msg (M_INFO, "TUN/TAP device %s opened", tunname);
+
+ /* tt->actual_name is passed to up and down scripts and used as the ifconfig dev name */
+ tt->actual_name = string_alloc (dynamic_opened ? dynamic_name : dev, NULL);
+ }
+}
+
+static void
+close_tun_generic (struct tuntap *tt)
+{
+ if (tt->fd >= 0)
+ close (tt->fd);
+ if (tt->actual_name)
+ free (tt->actual_name);
+ clear_tuntap (tt);
+}
+
+#endif
+
+#if defined(TARGET_LINUX)
+
+#ifdef HAVE_LINUX_IF_TUN_H /* New driver support */
+
+#ifndef HAVE_LINUX_SOCKIOS_H
+#error header file linux/sockios.h required
+#endif
+
+#if defined(HAVE_TUN_PI) && defined(HAVE_IPHDR) && defined(HAVE_IOVEC) && defined(ETH_P_IPV6) && defined(ETH_P_IP) && defined(HAVE_READV) && defined(HAVE_WRITEV)
+#define LINUX_IPV6 1
+/* #warning IPv6 ON */
+#else
+#define LINUX_IPV6 0
+/* #warning IPv6 OFF */
+#endif
+
+#if !PEDANTIC
+
+void
+open_tun (const char *dev, const char *dev_type, const char *dev_node, bool ipv6, struct tuntap *tt)
+{
+ struct ifreq ifr;
+
+ /*
+ * Set tt->ipv6 to true if
+ * (a) we have the capability of supporting --tun-ipv6, and
+ * (b) --tun-ipv6 was specified.
+ */
+ ipv6_support (ipv6, LINUX_IPV6, tt);
+
+ /*
+ * We handle --dev null specially, we do not open /dev/null for this.
+ */
+ if (tt->type == DEV_TYPE_NULL)
+ {
+ open_null (tt);
+ }
+ else
+ {
+ /*
+ * Process --dev-node
+ */
+ const char *node = dev_node;
+ if (!node)
+ node = "/dev/net/tun";
+
+ /*
+ * Open the interface
+ */
+ if ((tt->fd = open (node, O_RDWR)) < 0)
+ {
+ msg (M_WARN | M_ERRNO, "Note: Cannot open TUN/TAP dev %s", node);
+ goto linux_2_2_fallback;
+ }
+
+ /*
+ * Process --tun-ipv6
+ */
+ CLEAR (ifr);
+ if (!tt->ipv6)
+ ifr.ifr_flags = IFF_NO_PI;
+
+#if defined(IFF_ONE_QUEUE) && defined(SIOCSIFTXQLEN)
+ ifr.ifr_flags |= IFF_ONE_QUEUE;
+#endif
+
+ /*
+ * Figure out if tun or tap device
+ */
+ if (tt->type == DEV_TYPE_TUN)
+ {
+ ifr.ifr_flags |= IFF_TUN;
+ }
+ else if (tt->type == DEV_TYPE_TAP)
+ {
+ ifr.ifr_flags |= IFF_TAP;
+ }
+ else
+ {
+ msg (M_FATAL, "I don't recognize device %s as a tun or tap device",
+ dev);
+ }
+
+ /*
+ * Set an explicit name, if --dev is not tun or tap
+ */
+ if (strcmp(dev, "tun") && strcmp(dev, "tap"))
+ strncpynt (ifr.ifr_name, dev, IFNAMSIZ);
+
+ /*
+ * Use special ioctl that configures tun/tap device with the parms
+ * we set in ifr
+ */
+ if (ioctl (tt->fd, TUNSETIFF, (void *) &ifr) < 0)
+ {
+ msg (M_WARN | M_ERRNO, "Note: Cannot ioctl TUNSETIFF %s", dev);
+ goto linux_2_2_fallback;
+ }
+
+ msg (M_INFO, "TUN/TAP device %s opened", ifr.ifr_name);
+
+ /*
+ * Try making the TX send queue bigger
+ */
+#if defined(IFF_ONE_QUEUE) && defined(SIOCSIFTXQLEN)
+ {
+ struct ifreq netifr;
+ int ctl_fd;
+
+ if ((ctl_fd = socket (AF_INET, SOCK_DGRAM, 0)) >= 0)
+ {
+ CLEAR (netifr);
+ strncpynt (netifr.ifr_name, ifr.ifr_name, IFNAMSIZ);
+ netifr.ifr_qlen = tt->options.txqueuelen;
+ if (ioctl (ctl_fd, SIOCSIFTXQLEN, (void *) &netifr) >= 0)
+ msg (D_OSBUF, "TUN/TAP TX queue length set to %d", tt->options.txqueuelen);
+ else
+ msg (M_WARN | M_ERRNO, "Note: Cannot set tx queue length on %s", ifr.ifr_name);
+ close (ctl_fd);
+ }
+ else
+ {
+ msg (M_WARN | M_ERRNO, "Note: Cannot open control socket on %s", ifr.ifr_name);
+ }
+ }
+#endif
+
+ set_nonblock (tt->fd);
+ set_cloexec (tt->fd);
+ tt->actual_name = string_alloc (ifr.ifr_name, NULL);
+ }
+ return;
+
+ linux_2_2_fallback:
+ msg (M_INFO, "Note: Attempting fallback to kernel 2.2 TUN/TAP interface");
+ if (tt->fd >= 0)
+ {
+ close (tt->fd);
+ tt->fd = -1;
+ }
+ open_tun_generic (dev, dev_type, dev_node, ipv6, false, true, tt);
+}
+
+#else
+
+void
+open_tun (const char *dev, const char *dev_type, const char *dev_node, bool ipv6, struct tuntap *tt)
+{
+ ASSERT (0);
+}
+
+#endif
+
+#else
+
+void
+open_tun (const char *dev, const char *dev_type, const char *dev_node, bool ipv6, struct tuntap *tt)
+{
+ open_tun_generic (dev, dev_type, dev_node, ipv6, false, true, tt);
+}
+
+#endif /* HAVE_LINUX_IF_TUN_H */
+
+#ifdef TUNSETPERSIST
+
+void
+tuncfg (const char *dev, const char *dev_type, const char *dev_node, bool ipv6, int persist_mode)
+{
+ struct tuntap *tt;
+
+ ALLOC_OBJ (tt, struct tuntap);
+ clear_tuntap (tt);
+ tt->type = dev_type_enum (dev, dev_type);
+ open_tun (dev, dev_type, dev_node, ipv6, tt);
+ if (ioctl (tt->fd, TUNSETPERSIST, persist_mode) < 0)
+ msg (M_ERR, "Cannot ioctl TUNSETPERSIST(%d) %s", persist_mode, dev);
+ close_tun (tt);
+ msg (M_INFO, "Persist state set to: %s", (persist_mode ? "ON" : "OFF"));
+}
+
+#endif /* TUNSETPERSIST */
+
+void
+close_tun (struct tuntap *tt)
+{
+ if (tt)
+ {
+ close_tun_generic (tt);
+ free (tt);
+ }
+}
+
+int
+write_tun (struct tuntap* tt, uint8_t *buf, int len)
+{
+#if LINUX_IPV6
+ if (tt->ipv6)
+ {
+ struct tun_pi pi;
+ struct iphdr *iph;
+ struct iovec vect[2];
+ int ret;
+
+ iph = (struct iphdr *)buf;
+
+ pi.flags = 0;
+
+ if(iph->version == 6)
+ pi.proto = htons(ETH_P_IPV6);
+ else
+ pi.proto = htons(ETH_P_IP);
+
+ vect[0].iov_len = sizeof(pi);
+ vect[0].iov_base = &pi;
+ vect[1].iov_len = len;
+ vect[1].iov_base = buf;
+
+ ret = writev(tt->fd, vect, 2);
+ return(ret - sizeof(pi));
+ }
+ else
+#endif
+ return write (tt->fd, buf, len);
+}
+
+int
+read_tun (struct tuntap* tt, uint8_t *buf, int len)
+{
+#if LINUX_IPV6
+ if (tt->ipv6)
+ {
+ struct iovec vect[2];
+ struct tun_pi pi;
+ int ret;
+
+ vect[0].iov_len = sizeof(pi);
+ vect[0].iov_base = &pi;
+ vect[1].iov_len = len;
+ vect[1].iov_base = buf;
+
+ ret = readv(tt->fd, vect, 2);
+ return(ret - sizeof(pi));
+ }
+ else
+#endif
+ return read (tt->fd, buf, len);
+}
+
+#elif defined(TARGET_SOLARIS)
+
+#ifndef TUNNEWPPA
+#error I need the symbol TUNNEWPPA from net/if_tun.h
+#endif
+
+void
+open_tun (const char *dev, const char *dev_type, const char *dev_node, bool ipv6, struct tuntap *tt)
+{
+ int if_fd, muxid, ppa = -1;
+ struct ifreq ifr;
+ const char *ptr;
+ const char *ip_node;
+ const char *dev_tuntap_type;
+ int link_type;
+ bool is_tun;
+
+ ipv6_support (ipv6, false, tt);
+
+ if (tt->type == DEV_TYPE_NULL)
+ {
+ open_null (tt);
+ return;
+ }
+
+ if (tt->type == DEV_TYPE_TUN)
+ {
+ ip_node = "/dev/udp";
+ if (!dev_node)
+ dev_node = "/dev/tun";
+ dev_tuntap_type = "tun";
+ link_type = I_PLINK;
+ is_tun = true;
+ }
+ else if (tt->type == DEV_TYPE_TAP)
+ {
+ ip_node = "/dev/ip";
+ if (!dev_node)
+ dev_node = "/dev/tap";
+ dev_tuntap_type = "tap";
+ link_type = I_PLINK; /* was: I_LINK */
+ is_tun = false;
+ }
+ else
+ {
+ msg (M_FATAL, "I don't recognize device %s as a tun or tap device",
+ dev);
+ }
+
+ /* get unit number */
+ if (*dev)
+ {
+ ptr = dev;
+ while (*ptr && !isdigit ((int) *ptr))
+ ptr++;
+ ppa = atoi (ptr);
+ }
+
+ if ((tt->ip_fd = open (ip_node, O_RDWR, 0)) < 0)
+ msg (M_ERR, "Can't open %s", ip_node);
+
+ if ((tt->fd = open (dev_node, O_RDWR, 0)) < 0)
+ msg (M_ERR, "Can't open %s", dev_node);
+
+ /* Assign a new PPA and get its unit number. */
+ if ((ppa = ioctl (tt->fd, TUNNEWPPA, ppa)) < 0)
+ msg (M_ERR, "Can't assign new interface");
+
+ if ((if_fd = open (dev_node, O_RDWR, 0)) < 0)
+ msg (M_ERR, "Can't open %s (2)", dev_node);
+
+ if (ioctl (if_fd, I_PUSH, "ip") < 0)
+ msg (M_ERR, "Can't push IP module");
+
+ /* Assign ppa according to the unit number returned by tun device */
+ if (ioctl (if_fd, IF_UNITSEL, (char *) &ppa) < 0)
+ msg (M_ERR, "Can't set PPA %d", ppa);
+
+ if ((muxid = ioctl (tt->ip_fd, link_type, if_fd)) < 0)
+ msg (M_ERR, "Can't link %s device to IP", dev_tuntap_type);
+
+ close (if_fd);
+
+ tt->actual_name = (char *) malloc (32);
+ check_malloc_return (tt->actual_name);
+
+ openvpn_snprintf (tt->actual_name, 32, "%s%d", dev_tuntap_type, ppa);
+
+ CLEAR (ifr);
+ strncpynt (ifr.ifr_name, tt->actual_name, sizeof (ifr.ifr_name));
+ ifr.ifr_ip_muxid = muxid;
+
+ if (ioctl (tt->ip_fd, SIOCSIFMUXID, &ifr) < 0)
+ {
+ ioctl (tt->ip_fd, I_PUNLINK, muxid);
+ msg (M_ERR, "Can't set multiplexor id");
+ }
+
+ set_nonblock (tt->fd);
+ set_cloexec (tt->fd);
+ set_cloexec (tt->ip_fd);
+
+ msg (M_INFO, "TUN/TAP device %s opened", tt->actual_name);
+}
+
+static void
+solaris_close_tun (struct tuntap *tt)
+{
+ if (tt)
+ {
+ if (tt->ip_fd >= 0)
+ {
+ struct ifreq ifr;
+ CLEAR (ifr);
+ strncpynt (ifr.ifr_name, tt->actual_name, sizeof (ifr.ifr_name));
+
+ if (ioctl (tt->ip_fd, SIOCGIFFLAGS, &ifr) < 0)
+ msg (M_WARN | M_ERRNO, "Can't get iface flags");
+
+ if (ioctl (tt->ip_fd, SIOCGIFMUXID, &ifr) < 0)
+ msg (M_WARN | M_ERRNO, "Can't get multiplexor id");
+
+ if (ioctl (tt->ip_fd, I_PUNLINK, ifr.ifr_ip_muxid) < 0)
+ msg (M_WARN | M_ERRNO, "Can't unlink interface");
+
+ close (tt->ip_fd);
+ tt->ip_fd = -1;
+ }
+
+ if (tt->fd >= 0)
+ {
+ close (tt->fd);
+ tt->fd = -1;
+ }
+ }
+}
+
+/*
+ * Close TUN device.
+ */
+void
+close_tun (struct tuntap *tt)
+{
+ if (tt)
+ {
+ solaris_close_tun (tt);
+
+ if (tt->actual_name)
+ free (tt->actual_name);
+
+ clear_tuntap (tt);
+ free (tt);
+ }
+}
+
+static void
+solaris_error_close (struct tuntap *tt, const struct env_set *es, const char *actual)
+{
+ char command_line[256];
+
+ openvpn_snprintf (command_line, sizeof (command_line),
+ IFCONFIG_PATH " %s unplumb",
+ actual);
+
+ msg (M_INFO, "%s", command_line);
+ system_check (command_line, es, 0, "Solaris ifconfig unplumb failed");
+ close_tun (tt);
+ msg (M_FATAL, "Solaris ifconfig failed");
+}
+
+int
+write_tun (struct tuntap* tt, uint8_t *buf, int len)
+{
+ struct strbuf sbuf;
+ sbuf.len = len;
+ sbuf.buf = (char *)buf;
+ return putmsg (tt->fd, NULL, &sbuf, 0) >= 0 ? sbuf.len : -1;
+}
+
+int
+read_tun (struct tuntap* tt, uint8_t *buf, int len)
+{
+ struct strbuf sbuf;
+ int f = 0;
+
+ sbuf.maxlen = len;
+ sbuf.buf = (char *)buf;
+ return getmsg (tt->fd, NULL, &sbuf, &f) >= 0 ? sbuf.len : -1;
+}
+
+#elif defined(TARGET_OPENBSD)
+
+#if !defined(HAVE_READV) || !defined(HAVE_WRITEV)
+#error openbsd build requires readv & writev library functions
+#endif
+
+/*
+ * OpenBSD has a slightly incompatible TUN device from
+ * the rest of the world, in that it prepends a
+ * uint32 to the beginning of the IP header
+ * to designate the protocol (why not just
+ * look at the version field in the IP header to
+ * determine v4 or v6?).
+ *
+ * We strip off this field on reads and
+ * put it back on writes.
+ *
+ * I have not tested TAP devices on OpenBSD,
+ * but I have conditionalized the special
+ * TUN handling code described above to
+ * go away for TAP devices.
+ */
+
+void
+open_tun (const char *dev, const char *dev_type, const char *dev_node, bool ipv6, struct tuntap *tt)
+{
+ open_tun_generic (dev, dev_type, dev_node, ipv6, true, true, tt);
+
+ /* Enable multicast on the interface */
+ if (tt->fd >= 0)
+ {
+ struct tuninfo info;
+
+ if (ioctl (tt->fd, TUNGIFINFO, &info) < 0) {
+ msg (M_WARN | M_ERRNO, "Can't get interface info: %s",
+ strerror(errno));
+ }
+
+ info.flags |= IFF_MULTICAST;
+
+ if (ioctl (tt->fd, TUNSIFINFO, &info) < 0) {
+ msg (M_WARN | M_ERRNO, "Can't set interface info: %s",
+ strerror(errno));
+ }
+ }
+}
+
+void
+close_tun (struct tuntap* tt)
+{
+ if (tt)
+ {
+ close_tun_generic (tt);
+ free (tt);
+ }
+}
+
+static inline int
+openbsd_modify_read_write_return (int len)
+{
+ if (len > 0)
+ return len > sizeof (u_int32_t) ? len - sizeof (u_int32_t) : 0;
+ else
+ return len;
+}
+
+int
+write_tun (struct tuntap* tt, uint8_t *buf, int len)
+{
+ if (tt->type == DEV_TYPE_TUN)
+ {
+ u_int32_t type;
+ struct iovec iv[2];
+ struct ip *iph;
+
+ iph = (struct ip *) buf;
+
+ if (tt->ipv6 && iph->ip_v == 6)
+ type = htonl (AF_INET6);
+ else
+ type = htonl (AF_INET);
+
+ iv[0].iov_base = &type;
+ iv[0].iov_len = sizeof (type);
+ iv[1].iov_base = buf;
+ iv[1].iov_len = len;
+
+ return openbsd_modify_read_write_return (writev (tt->fd, iv, 2));
+ }
+ else
+ return write (tt->fd, buf, len);
+}
+
+int
+read_tun (struct tuntap* tt, uint8_t *buf, int len)
+{
+ if (tt->type == DEV_TYPE_TUN)
+ {
+ u_int32_t type;
+ struct iovec iv[2];
+
+ iv[0].iov_base = &type;
+ iv[0].iov_len = sizeof (type);
+ iv[1].iov_base = buf;
+ iv[1].iov_len = len;
+
+ return openbsd_modify_read_write_return (readv (tt->fd, iv, 2));
+ }
+ else
+ return read (tt->fd, buf, len);
+}
+
+#elif defined(TARGET_NETBSD)
+
+/*
+ * NetBSD does not support IPv6 on tun out of the box,
+ * but there exists a patch. When this patch is applied,
+ * only two things are left to openvpn:
+ * 1. Activate multicasting (this has already been done
+ * before by the kernel, but we make sure that nobody
+ * has deactivated multicasting inbetween.
+ * 2. Deactivate "link layer mode" (otherwise NetBSD
+ * prepends the address family to the packet, and we
+ * would run into the same trouble as with OpenBSD.
+ */
+
+void
+open_tun (const char *dev, const char *dev_type, const char *dev_node, bool ipv6, struct tuntap *tt)
+{
+ open_tun_generic (dev, dev_type, dev_node, ipv6, true, true, tt);
+ if (tt->fd >= 0)
+ {
+ int i = IFF_POINTOPOINT|IFF_MULTICAST;
+ ioctl (tt->fd, TUNSIFMODE, &i); /* multicast on */
+ i = 0;
+ ioctl (tt->fd, TUNSLMODE, &i); /* link layer mode off */
+ }
+}
+
+void
+close_tun (struct tuntap *tt)
+{
+ if (tt)
+ {
+ close_tun_generic (tt);
+ free (tt);
+ }
+}
+
+int
+write_tun (struct tuntap* tt, uint8_t *buf, int len)
+{
+ return write (tt->fd, buf, len);
+}
+
+int
+read_tun (struct tuntap* tt, uint8_t *buf, int len)
+{
+ return read (tt->fd, buf, len);
+}
+
+#elif defined(TARGET_FREEBSD)
+
+static inline int
+freebsd_modify_read_write_return (int len)
+{
+ if (len > 0)
+ return len > sizeof (u_int32_t) ? len - sizeof (u_int32_t) : 0;
+ else
+ return len;
+}
+
+void
+open_tun (const char *dev, const char *dev_type, const char *dev_node, bool ipv6, struct tuntap *tt)
+{
+ open_tun_generic (dev, dev_type, dev_node, ipv6, true, true, tt);
+
+ if (tt->fd >= 0)
+ {
+ int i = 0;
+
+ /* Disable extended modes */
+ ioctl (tt->fd, TUNSLMODE, &i);
+ i = 1;
+ ioctl (tt->fd, TUNSIFHEAD, &i);
+ }
+}
+
+void
+close_tun (struct tuntap *tt)
+{
+ if (tt)
+ {
+ close_tun_generic (tt);
+ free (tt);
+ }
+}
+
+int
+write_tun (struct tuntap* tt, uint8_t *buf, int len)
+{
+ if (tt->type == DEV_TYPE_TUN)
+ {
+ u_int32_t type;
+ struct iovec iv[2];
+ struct ip *iph;
+
+ iph = (struct ip *) buf;
+
+ if (tt->ipv6 && iph->ip_v == 6)
+ type = htonl (AF_INET6);
+ else
+ type = htonl (AF_INET);
+
+ iv[0].iov_base = (char *)&type;
+ iv[0].iov_len = sizeof (type);
+ iv[1].iov_base = buf;
+ iv[1].iov_len = len;
+
+ return freebsd_modify_read_write_return (writev (tt->fd, iv, 2));
+ }
+ else
+ return write (tt->fd, buf, len);
+}
+
+int
+read_tun (struct tuntap* tt, uint8_t *buf, int len)
+{
+ if (tt->type == DEV_TYPE_TUN)
+ {
+ u_int32_t type;
+ struct iovec iv[2];
+
+ iv[0].iov_base = (char *)&type;
+ iv[0].iov_len = sizeof (type);
+ iv[1].iov_base = buf;
+ iv[1].iov_len = len;
+
+ return freebsd_modify_read_write_return (readv (tt->fd, iv, 2));
+ }
+ else
+ return read (tt->fd, buf, len);
+}
+
+#elif defined(WIN32)
+
+int
+tun_read_queue (struct tuntap *tt, int maxsize)
+{
+ if (tt->reads.iostate == IOSTATE_INITIAL)
+ {
+ DWORD len;
+ BOOL status;
+ int err;
+
+ /* reset buf to its initial state */
+ tt->reads.buf = tt->reads.buf_init;
+
+ len = maxsize ? maxsize : BLEN (&tt->reads.buf);
+ ASSERT (len <= BLEN (&tt->reads.buf));
+
+ /* the overlapped read will signal this event on I/O completion */
+ ASSERT (ResetEvent (tt->reads.overlapped.hEvent));
+
+ status = ReadFile(
+ tt->hand,
+ BPTR (&tt->reads.buf),
+ len,
+ &tt->reads.size,
+ &tt->reads.overlapped
+ );
+
+ if (status) /* operation completed immediately? */
+ {
+ /* since we got an immediate return, we must signal the event object ourselves */
+ ASSERT (SetEvent (tt->reads.overlapped.hEvent));
+
+ tt->reads.iostate = IOSTATE_IMMEDIATE_RETURN;
+ tt->reads.status = 0;
+
+ dmsg (D_WIN32_IO, "WIN32 I/O: TAP Read immediate return [%d,%d]",
+ (int) len,
+ (int) tt->reads.size);
+ }
+ else
+ {
+ err = GetLastError ();
+ if (err == ERROR_IO_PENDING) /* operation queued? */
+ {
+ tt->reads.iostate = IOSTATE_QUEUED;
+ tt->reads.status = err;
+ dmsg (D_WIN32_IO, "WIN32 I/O: TAP Read queued [%d]",
+ (int) len);
+ }
+ else /* error occurred */
+ {
+ struct gc_arena gc = gc_new ();
+ ASSERT (SetEvent (tt->reads.overlapped.hEvent));
+ tt->reads.iostate = IOSTATE_IMMEDIATE_RETURN;
+ tt->reads.status = err;
+ dmsg (D_WIN32_IO, "WIN32 I/O: TAP Read error [%d] : %s",
+ (int) len,
+ strerror_win32 (status, &gc));
+ gc_free (&gc);
+ }
+ }
+ }
+ return tt->reads.iostate;
+}
+
+int
+tun_write_queue (struct tuntap *tt, struct buffer *buf)
+{
+ if (tt->writes.iostate == IOSTATE_INITIAL)
+ {
+ BOOL status;
+ int err;
+
+ /* make a private copy of buf */
+ tt->writes.buf = tt->writes.buf_init;
+ tt->writes.buf.len = 0;
+ ASSERT (buf_copy (&tt->writes.buf, buf));
+
+ /* the overlapped write will signal this event on I/O completion */
+ ASSERT (ResetEvent (tt->writes.overlapped.hEvent));
+
+ status = WriteFile(
+ tt->hand,
+ BPTR (&tt->writes.buf),
+ BLEN (&tt->writes.buf),
+ &tt->writes.size,
+ &tt->writes.overlapped
+ );
+
+ if (status) /* operation completed immediately? */
+ {
+ tt->writes.iostate = IOSTATE_IMMEDIATE_RETURN;
+
+ /* since we got an immediate return, we must signal the event object ourselves */
+ ASSERT (SetEvent (tt->writes.overlapped.hEvent));
+
+ tt->writes.status = 0;
+
+ dmsg (D_WIN32_IO, "WIN32 I/O: TAP Write immediate return [%d,%d]",
+ BLEN (&tt->writes.buf),
+ (int) tt->writes.size);
+ }
+ else
+ {
+ err = GetLastError ();
+ if (err == ERROR_IO_PENDING) /* operation queued? */
+ {
+ tt->writes.iostate = IOSTATE_QUEUED;
+ tt->writes.status = err;
+ dmsg (D_WIN32_IO, "WIN32 I/O: TAP Write queued [%d]",
+ BLEN (&tt->writes.buf));
+ }
+ else /* error occurred */
+ {
+ struct gc_arena gc = gc_new ();
+ ASSERT (SetEvent (tt->writes.overlapped.hEvent));
+ tt->writes.iostate = IOSTATE_IMMEDIATE_RETURN;
+ tt->writes.status = err;
+ dmsg (D_WIN32_IO, "WIN32 I/O: TAP Write error [%d] : %s",
+ BLEN (&tt->writes.buf),
+ strerror_win32 (err, &gc));
+ gc_free (&gc);
+ }
+ }
+ }
+ return tt->writes.iostate;
+}
+
+int
+tun_finalize (
+ HANDLE h,
+ struct overlapped_io *io,
+ struct buffer *buf)
+{
+ int ret = -1;
+ BOOL status;
+
+ switch (io->iostate)
+ {
+ case IOSTATE_QUEUED:
+ status = GetOverlappedResult(
+ h,
+ &io->overlapped,
+ &io->size,
+ FALSE
+ );
+ if (status)
+ {
+ /* successful return for a queued operation */
+ if (buf)
+ *buf = io->buf;
+ ret = io->size;
+ io->iostate = IOSTATE_INITIAL;
+ ASSERT (ResetEvent (io->overlapped.hEvent));
+ dmsg (D_WIN32_IO, "WIN32 I/O: TAP Completion success [%d]", ret);
+ }
+ else
+ {
+ /* error during a queued operation */
+ ret = -1;
+ if (GetLastError() != ERROR_IO_INCOMPLETE)
+ {
+ /* if no error (i.e. just not finished yet),
+ then DON'T execute this code */
+ io->iostate = IOSTATE_INITIAL;
+ ASSERT (ResetEvent (io->overlapped.hEvent));
+ msg (D_WIN32_IO | M_ERRNO, "WIN32 I/O: TAP Completion error");
+ }
+ }
+ break;
+
+ case IOSTATE_IMMEDIATE_RETURN:
+ io->iostate = IOSTATE_INITIAL;
+ ASSERT (ResetEvent (io->overlapped.hEvent));
+ if (io->status)
+ {
+ /* error return for a non-queued operation */
+ SetLastError (io->status);
+ ret = -1;
+ msg (D_WIN32_IO | M_ERRNO, "WIN32 I/O: TAP Completion non-queued error");
+ }
+ else
+ {
+ /* successful return for a non-queued operation */
+ if (buf)
+ *buf = io->buf;
+ ret = io->size;
+ dmsg (D_WIN32_IO, "WIN32 I/O: TAP Completion non-queued success [%d]", ret);
+ }
+ break;
+
+ case IOSTATE_INITIAL: /* were we called without proper queueing? */
+ SetLastError (ERROR_INVALID_FUNCTION);
+ ret = -1;
+ dmsg (D_WIN32_IO, "WIN32 I/O: TAP Completion BAD STATE");
+ break;
+
+ default:
+ ASSERT (0);
+ }
+
+ if (buf)
+ buf->len = ret;
+ return ret;
+}
+
+const struct tap_reg *
+get_tap_reg (struct gc_arena *gc)
+{
+ HKEY adapter_key;
+ LONG status;
+ DWORD len;
+ struct tap_reg *first = NULL;
+ struct tap_reg *last = NULL;
+ int i = 0;
+
+ status = RegOpenKeyEx(
+ HKEY_LOCAL_MACHINE,
+ ADAPTER_KEY,
+ 0,
+ KEY_READ,
+ &adapter_key);
+
+ if (status != ERROR_SUCCESS)
+ msg (M_FATAL, "Error opening registry key: %s", ADAPTER_KEY);
+
+ while (true)
+ {
+ char enum_name[256];
+ char unit_string[256];
+ HKEY unit_key;
+ char component_id_string[] = "ComponentId";
+ char component_id[256];
+ char net_cfg_instance_id_string[] = "NetCfgInstanceId";
+ char net_cfg_instance_id[256];
+ DWORD data_type;
+
+ len = sizeof (enum_name);
+ status = RegEnumKeyEx(
+ adapter_key,
+ i,
+ enum_name,
+ &len,
+ NULL,
+ NULL,
+ NULL,
+ NULL);
+ if (status == ERROR_NO_MORE_ITEMS)
+ break;
+ else if (status != ERROR_SUCCESS)
+ msg (M_FATAL, "Error enumerating registry subkeys of key: %s",
+ ADAPTER_KEY);
+
+ openvpn_snprintf (unit_string, sizeof(unit_string), "%s\\%s",
+ ADAPTER_KEY, enum_name);
+
+ status = RegOpenKeyEx(
+ HKEY_LOCAL_MACHINE,
+ unit_string,
+ 0,
+ KEY_READ,
+ &unit_key);
+
+ if (status != ERROR_SUCCESS)
+ dmsg (D_REGISTRY, "Error opening registry key: %s", unit_string);
+ else
+ {
+ len = sizeof (component_id);
+ status = RegQueryValueEx(
+ unit_key,
+ component_id_string,
+ NULL,
+ &data_type,
+ component_id,
+ &len);
+
+ if (status != ERROR_SUCCESS || data_type != REG_SZ)
+ dmsg (D_REGISTRY, "Error opening registry key: %s\\%s",
+ unit_string, component_id_string);
+ else
+ {
+ len = sizeof (net_cfg_instance_id);
+ status = RegQueryValueEx(
+ unit_key,
+ net_cfg_instance_id_string,
+ NULL,
+ &data_type,
+ net_cfg_instance_id,
+ &len);
+
+ if (status == ERROR_SUCCESS && data_type == REG_SZ)
+ {
+ if (!strcmp (component_id, TAP_COMPONENT_ID))
+ {
+ struct tap_reg *reg;
+ ALLOC_OBJ_CLEAR_GC (reg, struct tap_reg, gc);
+ reg->guid = string_alloc (net_cfg_instance_id, gc);
+
+ /* link into return list */
+ if (!first)
+ first = reg;
+ if (last)
+ last->next = reg;
+ last = reg;
+ }
+ }
+ }
+ RegCloseKey (unit_key);
+ }
+ ++i;
+ }
+
+ RegCloseKey (adapter_key);
+ return first;
+}
+
+const struct panel_reg *
+get_panel_reg (struct gc_arena *gc)
+{
+ LONG status;
+ HKEY network_connections_key;
+ DWORD len;
+ struct panel_reg *first = NULL;
+ struct panel_reg *last = NULL;
+ int i = 0;
+
+ status = RegOpenKeyEx(
+ HKEY_LOCAL_MACHINE,
+ NETWORK_CONNECTIONS_KEY,
+ 0,
+ KEY_READ,
+ &network_connections_key);
+
+ if (status != ERROR_SUCCESS)
+ msg (M_FATAL, "Error opening registry key: %s", NETWORK_CONNECTIONS_KEY);
+
+ while (true)
+ {
+ char enum_name[256];
+ char connection_string[256];
+ HKEY connection_key;
+ char name_data[256];
+ DWORD name_type;
+ const char name_string[] = "Name";
+
+ len = sizeof (enum_name);
+ status = RegEnumKeyEx(
+ network_connections_key,
+ i,
+ enum_name,
+ &len,
+ NULL,
+ NULL,
+ NULL,
+ NULL);
+ if (status == ERROR_NO_MORE_ITEMS)
+ break;
+ else if (status != ERROR_SUCCESS)
+ msg (M_FATAL, "Error enumerating registry subkeys of key: %s",
+ NETWORK_CONNECTIONS_KEY);
+
+ openvpn_snprintf (connection_string, sizeof(connection_string),
+ "%s\\%s\\Connection",
+ NETWORK_CONNECTIONS_KEY, enum_name);
+
+ status = RegOpenKeyEx(
+ HKEY_LOCAL_MACHINE,
+ connection_string,
+ 0,
+ KEY_READ,
+ &connection_key);
+
+ if (status != ERROR_SUCCESS)
+ dmsg (D_REGISTRY, "Error opening registry key: %s", connection_string);
+ else
+ {
+ len = sizeof (name_data);
+ status = RegQueryValueEx(
+ connection_key,
+ name_string,
+ NULL,
+ &name_type,
+ name_data,
+ &len);
+
+ if (status != ERROR_SUCCESS || name_type != REG_SZ)
+ dmsg (D_REGISTRY, "Error opening registry key: %s\\%s\\%s",
+ NETWORK_CONNECTIONS_KEY, connection_string, name_string);
+ else
+ {
+ struct panel_reg *reg;
+
+ ALLOC_OBJ_CLEAR_GC (reg, struct panel_reg, gc);
+ reg->name = string_alloc (name_data, gc);
+ reg->guid = string_alloc (enum_name, gc);
+
+ /* link into return list */
+ if (!first)
+ first = reg;
+ if (last)
+ last->next = reg;
+ last = reg;
+ }
+ RegCloseKey (connection_key);
+ }
+ ++i;
+ }
+
+ RegCloseKey (network_connections_key);
+
+ return first;
+}
+
+/*
+ * Check that two addresses are part of the same 255.255.255.252 subnet.
+ */
+void
+verify_255_255_255_252 (in_addr_t local, in_addr_t remote)
+{
+ struct gc_arena gc = gc_new ();
+ const unsigned int mask = 3;
+ const char *err = NULL;
+
+ if (local == remote)
+ {
+ err = "must be different";
+ goto error;
+ }
+ if ((local & (~mask)) != (remote & (~mask)))
+ {
+ err = "must exist within the same 255.255.255.252 subnet. This is a limitation of --dev tun when used with the TAP-WIN32 driver";
+ goto error;
+ }
+ if ((local & mask) == 0
+ || (local & mask) == 3
+ || (remote & mask) == 0
+ || (remote & mask) == 3)
+ {
+ err = "cannot use the first or last address within a given 255.255.255.252 subnet. This is a limitation of --dev tun when used with the TAP-WIN32 driver";
+ goto error;
+ }
+
+ gc_free (&gc);
+ return;
+
+ error:
+ msg (M_FATAL, "There is a problem in your selection of --ifconfig endpoints [local=%s, remote=%s]. The local and remote VPN endpoints %s. Try '" PACKAGE " --show-valid-subnets' option for more info.",
+ print_in_addr_t (local, 0, &gc),
+ print_in_addr_t (remote, 0, &gc),
+ err);
+ gc_free (&gc);
+}
+
+void show_valid_win32_tun_subnets (void)
+{
+ int i;
+ int col = 0;
+
+ printf ("On Windows, point-to-point IP support (i.e. --dev tun)\n");
+ printf ("is emulated by the TAP-Win32 driver. The major limitation\n");
+ printf ("imposed by this approach is that the --ifconfig local and\n");
+ printf ("remote endpoints must be part of the same 255.255.255.252\n");
+ printf ("subnet. The following list shows examples of endpoint\n");
+ printf ("pairs which satisfy this requirement. Only the final\n");
+ printf ("component of the IP address pairs is at issue.\n\n");
+ printf ("As an example, the following option would be correct:\n");
+ printf (" --ifconfig 10.7.0.5 10.7.0.6 (on host A)\n");
+ printf (" --ifconfig 10.7.0.6 10.7.0.5 (on host B)\n");
+ printf ("because [5,6] is part of the below list.\n\n");
+
+ for (i = 0; i < 256; i += 4)
+ {
+ printf("[%3d,%3d] ", i+1, i+2);
+ if (++col > 4)
+ {
+ col = 0;
+ printf ("\n");
+ }
+ }
+ if (col)
+ printf ("\n");
+}
+
+void
+show_tap_win32_adapters (int msglev, int warnlev)
+{
+ struct gc_arena gc = gc_new ();
+
+ bool warn_panel_null = false;
+ bool warn_panel_dup = false;
+ bool warn_tap_dup = false;
+
+ int links;
+
+ const struct tap_reg *tr;
+ const struct tap_reg *tr1;
+ const struct panel_reg *pr;
+
+ const struct tap_reg *tap_reg = get_tap_reg (&gc);
+ const struct panel_reg *panel_reg = get_panel_reg (&gc);
+
+ msg (msglev, "Available TAP-WIN32 adapters [name, GUID]:");
+
+ /* loop through each TAP-Win32 adapter registry entry */
+ for (tr = tap_reg; tr != NULL; tr = tr->next)
+ {
+ links = 0;
+
+ /* loop through each network connections entry in the control panel */
+ for (pr = panel_reg; pr != NULL; pr = pr->next)
+ {
+ if (!strcmp (tr->guid, pr->guid))
+ {
+ msg (msglev, "'%s' %s", pr->name, tr->guid);
+ ++links;
+ }
+ }
+
+ if (links > 1)
+ {
+ warn_panel_dup = true;
+ }
+ else if (links == 0)
+ {
+ /* a TAP adapter exists without a link from the network
+ connections control panel */
+ warn_panel_null = true;
+ msg (msglev, "[NULL] %s", tr->guid);
+ }
+ }
+
+ /* check for TAP-Win32 adapter duplicated GUIDs */
+ for (tr = tap_reg; tr != NULL; tr = tr->next)
+ {
+ for (tr1 = tap_reg; tr1 != NULL; tr1 = tr1->next)
+ {
+ if (tr != tr1 && !strcmp (tr->guid, tr1->guid))
+ warn_tap_dup = true;
+ }
+ }
+
+ /* warn on registry inconsistencies */
+ if (warn_tap_dup)
+ msg (warnlev, "WARNING: Some TAP-Win32 adapters have duplicate GUIDs");
+
+ if (warn_panel_dup)
+ msg (warnlev, "WARNING: Some TAP-Win32 adapters have duplicate links from the Network Connections control panel");
+
+ if (warn_panel_null)
+ msg (warnlev, "WARNING: Some TAP-Win32 adapters have no link from the Network Connections control panel");
+
+ gc_free (&gc);
+}
+
+/*
+ * Confirm that GUID is a TAP-Win32 adapter.
+ */
+static bool
+is_tap_win32 (const char *guid, const struct tap_reg *tap_reg)
+{
+ const struct tap_reg *tr;
+
+ for (tr = tap_reg; tr != NULL; tr = tr->next)
+ {
+ if (guid && !strcmp (tr->guid, guid))
+ return true;
+ }
+
+ return false;
+}
+
+static const char *
+guid_to_name (const char *guid, const struct panel_reg *panel_reg)
+{
+ const struct panel_reg *pr;
+
+ for (pr = panel_reg; pr != NULL; pr = pr->next)
+ {
+ if (guid && !strcmp (pr->guid, guid))
+ return pr->name;
+ }
+
+ return NULL;
+}
+
+static const char *
+name_to_guid (const char *name, const struct tap_reg *tap_reg, const struct panel_reg *panel_reg)
+{
+ const struct panel_reg *pr;
+
+ for (pr = panel_reg; pr != NULL; pr = pr->next)
+ {
+ if (name && !strcmp (pr->name, name) && is_tap_win32 (pr->guid, tap_reg))
+ return pr->guid;
+ }
+
+ return NULL;
+}
+
+static void
+at_least_one_tap_win32 (const struct tap_reg *tap_reg)
+{
+ if (!tap_reg)
+ msg (M_FATAL, "There are no TAP-Win32 adapters on this system. You should be able to create a TAP-Win32 adapter by going to Start -> All Programs -> " PACKAGE_NAME " -> Add a new TAP-Win32 virtual ethernet adapter.");
+}
+
+/*
+ * Get an adapter GUID and optional actual_name from the
+ * registry for the TAP device # = device_number.
+ */
+static const char *
+get_unspecified_device_guid (const int device_number,
+ char *actual_name,
+ int actual_name_size,
+ const struct tap_reg *tap_reg_src,
+ const struct panel_reg *panel_reg_src,
+ struct gc_arena *gc)
+{
+ const struct tap_reg *tap_reg = tap_reg_src;
+ struct buffer ret = clear_buf ();
+ struct buffer actual = clear_buf ();
+ int i;
+
+ ASSERT (device_number >= 0);
+
+ /* Make sure we have at least one TAP adapter */
+ if (!tap_reg)
+ return NULL;
+
+ /* The actual_name output buffer may be NULL */
+ if (actual_name)
+ {
+ ASSERT (actual_name_size > 0);
+ buf_set_write (&actual, actual_name, actual_name_size);
+ }
+
+ /* Move on to specified device number */
+ for (i = 0; i < device_number; i++)
+ {
+ tap_reg = tap_reg->next;
+ if (!tap_reg)
+ return NULL;
+ }
+
+ /* Save Network Panel name (if exists) in actual_name */
+ if (actual_name)
+ {
+ const char *act = guid_to_name (tap_reg->guid, panel_reg_src);
+ if (act)
+ buf_printf (&actual, "%s", act);
+ else
+ buf_printf (&actual, "NULL");
+ }
+
+ /* Save GUID for return value */
+ ret = alloc_buf_gc (256, gc);
+ buf_printf (&ret, "%s", tap_reg->guid);
+ return BSTR (&ret);
+}
+
+/*
+ * Lookup a --dev-node adapter name in the registry
+ * returning the GUID and optional actual_name.
+ */
+static const char *
+get_device_guid (const char *name,
+ char *actual_name,
+ int actual_name_size,
+ const struct tap_reg *tap_reg,
+ const struct panel_reg *panel_reg,
+ struct gc_arena *gc)
+{
+ struct buffer ret = alloc_buf_gc (256, gc);
+ struct buffer actual = clear_buf ();
+
+ /* Make sure we have at least one TAP adapter */
+ if (!tap_reg)
+ return NULL;
+
+ /* The actual_name output buffer may be NULL */
+ if (actual_name)
+ {
+ ASSERT (actual_name_size > 0);
+ buf_set_write (&actual, actual_name, actual_name_size);
+ }
+
+ /* Check if GUID was explicitly specified as --dev-node parameter */
+ if (is_tap_win32 (name, tap_reg))
+ {
+ const char *act = guid_to_name (name, panel_reg);
+ buf_printf (&ret, "%s", name);
+ if (act)
+ buf_printf (&actual, "%s", act);
+ else
+ buf_printf (&actual, "NULL");
+ return BSTR (&ret);
+ }
+
+ /* Lookup TAP adapter in network connections list */
+ {
+ const char *guid = name_to_guid (name, tap_reg, panel_reg);
+ if (guid)
+ {
+ buf_printf (&actual, "%s", name);
+ buf_printf (&ret, "%s", guid);
+ return BSTR (&ret);
+ }
+ }
+
+ return NULL;
+}
+
+/*
+ * Return a TAP name for netsh commands.
+ */
+const char *
+get_netsh_id (const char *dev_node, struct gc_arena *gc)
+{
+ const struct tap_reg *tap_reg = get_tap_reg (gc);
+ const struct panel_reg *panel_reg = get_panel_reg (gc);
+ struct buffer actual = alloc_buf_gc (256, gc);
+ const char *guid;
+
+ at_least_one_tap_win32 (tap_reg);
+
+ if (dev_node)
+ {
+ guid = get_device_guid (dev_node, BPTR (&actual), BCAP (&actual), tap_reg, panel_reg, gc);
+ }
+ else
+ {
+ guid = get_unspecified_device_guid (0, BPTR (&actual), BCAP (&actual), tap_reg, panel_reg, gc);
+
+ if (get_unspecified_device_guid (1, NULL, 0, tap_reg, panel_reg, gc)) /* ambiguous if more than one TAP-Win32 adapter */
+ guid = NULL;
+ }
+
+ if (!guid)
+ return "NULL"; /* not found */
+ else if (strcmp (BPTR (&actual), "NULL"))
+ return BPTR (&actual); /* control panel name */
+ else
+ return guid; /* no control panel name, return GUID instead */
+}
+
+/*
+ * Get adapter info list
+ */
+const IP_ADAPTER_INFO *
+get_adapter_info_list (struct gc_arena *gc)
+{
+ ULONG size = 0;
+ IP_ADAPTER_INFO *pi = NULL;
+ DWORD status;
+
+ if ((status = GetAdaptersInfo (NULL, &size)) != ERROR_BUFFER_OVERFLOW)
+ {
+ msg (M_INFO, "GetAdaptersInfo #1 failed (status=%u) : %s",
+ (unsigned int)status,
+ strerror_win32 (status, gc));
+ }
+ else
+ {
+ pi = (PIP_ADAPTER_INFO) gc_malloc (size, false, gc);
+ if ((status = GetAdaptersInfo (pi, &size)) == NO_ERROR)
+ return pi;
+ else
+ {
+ msg (M_INFO, "GetAdaptersInfo #2 failed (status=%u) : %s",
+ (unsigned int)status,
+ strerror_win32 (status, gc));
+ }
+ }
+ return pi;
+}
+
+static const IP_INTERFACE_INFO *
+get_interface_info_list (struct gc_arena *gc)
+{
+ ULONG size = 0;
+ IP_INTERFACE_INFO *ii = NULL;
+ DWORD status;
+
+ if ((status = GetInterfaceInfo (NULL, &size)) != ERROR_INSUFFICIENT_BUFFER)
+ {
+ msg (M_INFO, "GetInterfaceInfo #1 failed (status=%u) : %s",
+ (unsigned int)status,
+ strerror_win32 (status, gc));
+ }
+ else
+ {
+ ii = (PIP_INTERFACE_INFO) gc_malloc (size, false, gc);
+ if ((status = GetInterfaceInfo (ii, &size)) == NO_ERROR)
+ return ii;
+ else
+ {
+ msg (M_INFO, "GetInterfaceInfo #2 failed (status=%u) : %s",
+ (unsigned int)status,
+ strerror_win32 (status, gc));
+ }
+ }
+ return ii;
+}
+
+static const IP_ADAPTER_INDEX_MAP *
+get_interface_info (DWORD index, struct gc_arena *gc)
+{
+ const IP_INTERFACE_INFO *list = get_interface_info_list (gc);
+ if (list)
+ {
+ int i;
+ for (i = 0; i < list->NumAdapters; ++i)
+ {
+ const IP_ADAPTER_INDEX_MAP *inter = &list->Adapter[i];
+ if (index == inter->Index)
+ return inter;
+ }
+ }
+ return NULL;
+}
+
+/*
+ * Given an adapter index, return a pointer to the
+ * IP_ADAPTER_INFO structure for that adapter.
+ */
+
+static const IP_ADAPTER_INFO *
+get_adapter (const IP_ADAPTER_INFO *ai, DWORD index)
+{
+ if (ai && index != (DWORD)~0)
+ {
+ const IP_ADAPTER_INFO *a;
+
+ /* find index in the linked list */
+ for (a = ai; a != NULL; a = a->Next)
+ {
+ if (a->Index == index)
+ return a;
+ }
+ }
+ return NULL;
+}
+
+static const IP_ADAPTER_INFO *
+get_adapter_info (DWORD index, struct gc_arena *gc)
+{
+ return get_adapter (get_adapter_info_list (gc), index);
+}
+
+static int
+get_adapter_n_ip_netmask (const IP_ADAPTER_INFO *ai)
+{
+ if (ai)
+ {
+ int n = 0;
+ const IP_ADDR_STRING *ip = &ai->IpAddressList;
+
+ while (ip)
+ {
+ ++n;
+ ip = ip->Next;
+ }
+ return n;
+ }
+ else
+ return 0;
+}
+
+static bool
+get_adapter_ip_netmask (const IP_ADAPTER_INFO *ai, const int n, in_addr_t *ip, in_addr_t *netmask)
+{
+ bool ret = false;
+ *ip = 0;
+ *netmask = 0;
+
+ if (ai)
+ {
+ const IP_ADDR_STRING *iplist = &ai->IpAddressList;
+ int i = 0;
+
+ while (iplist)
+ {
+ if (i == n)
+ break;
+ ++i;
+ iplist = iplist->Next;
+ }
+
+ if (iplist)
+ {
+ const unsigned int getaddr_flags = GETADDR_HOST_ORDER;
+ const char *ip_str = iplist->IpAddress.String;
+ const char *netmask_str = iplist->IpMask.String;
+ bool succeed1 = false;
+ bool succeed2 = false;
+
+ if (ip_str && netmask_str && strlen (ip_str) && strlen (netmask_str))
+ {
+ *ip = getaddr (getaddr_flags, ip_str, 0, &succeed1, NULL);
+ *netmask = getaddr (getaddr_flags, netmask_str, 0, &succeed2, NULL);
+ ret = (succeed1 == true && succeed2 == true);
+ }
+ }
+ }
+
+ return ret;
+}
+
+const IP_ADAPTER_INFO *
+get_tun_adapter (const struct tuntap *tt, const IP_ADAPTER_INFO *list)
+{
+ if (list && tt)
+ return get_adapter (list, tt->adapter_index);
+ else
+ return NULL;
+}
+
+bool
+is_adapter_up (const struct tuntap *tt, const IP_ADAPTER_INFO *list)
+{
+ int i;
+ bool ret = false;
+
+ const IP_ADAPTER_INFO *ai = get_tun_adapter (tt, list);
+
+ if (ai)
+ {
+ const int n = get_adapter_n_ip_netmask (ai);
+
+ /* loop once for every IP/netmask assigned to adapter */
+ for (i = 0; i < n; ++i)
+ {
+ in_addr_t ip, netmask;
+ if (get_adapter_ip_netmask (ai, i, &ip, &netmask))
+ {
+ if (tt->local && tt->adapter_netmask)
+ {
+ /* wait for our --ifconfig parms to match the actual adapter parms */
+ if (tt->local == ip && tt->adapter_netmask == netmask)
+ ret = true;
+ }
+ else
+ {
+ /* --ifconfig was not defined, maybe using a real DHCP server */
+ if (ip && netmask)
+ ret = true;
+ }
+ }
+ }
+ }
+ else
+ ret = true; /* this can occur when TAP adapter is bridged */
+
+ return ret;
+}
+
+bool
+is_ip_in_adapter_subnet (const IP_ADAPTER_INFO *ai, const in_addr_t ip, in_addr_t *highest_netmask)
+{
+ int i;
+ bool ret = false;
+
+ if (highest_netmask)
+ *highest_netmask = 0;
+
+ if (ai)
+ {
+ const int n = get_adapter_n_ip_netmask (ai);
+ for (i = 0; i < n; ++i)
+ {
+ in_addr_t adapter_ip, adapter_netmask;
+ if (get_adapter_ip_netmask (ai, i, &adapter_ip, &adapter_netmask))
+ {
+ if (adapter_ip && adapter_netmask && (ip & adapter_netmask) == (adapter_ip & adapter_netmask))
+ {
+ if (highest_netmask && adapter_netmask > *highest_netmask)
+ *highest_netmask = adapter_netmask;
+ ret = true;
+ }
+ }
+ }
+ }
+ return ret;
+}
+
+DWORD
+adapter_index_of_ip (const IP_ADAPTER_INFO *list, const in_addr_t ip, int *count)
+{
+ struct gc_arena gc = gc_new ();
+ DWORD ret = ~0;
+ in_addr_t highest_netmask = 0;
+ bool first = true;
+
+ if (count)
+ *count = 0;
+
+ while (list)
+ {
+ in_addr_t hn;
+
+ if (is_ip_in_adapter_subnet (list, ip, &hn))
+ {
+ if (first || hn > highest_netmask)
+ {
+ highest_netmask = hn;
+ if (count)
+ *count = 1;
+ ret = list->Index;
+ first = false;
+ }
+ else if (hn == highest_netmask)
+ {
+ if (count)
+ ++*count;
+ }
+ }
+ list = list->Next;
+ }
+
+ dmsg (D_ROUTE_DEBUG, "DEBUG: IP Locate: ip=%s nm=%s index=%d count=%d",
+ print_in_addr_t (ip, 0, &gc),
+ print_in_addr_t (highest_netmask, 0, &gc),
+ (int)ret,
+ count ? *count : -1);
+
+ if (ret == ~0 && count)
+ *count = 0;
+
+ gc_free (&gc);
+ return ret;
+}
+
+/*
+ * Given an adapter index, return true if the adapter
+ * is DHCP disabled.
+ */
+static bool
+dhcp_disabled (DWORD index)
+{
+ struct gc_arena gc = gc_new ();
+ const IP_ADAPTER_INFO *ai = get_adapter_info (index, &gc);
+ bool ret = false;
+
+ if (ai && !ai->DhcpEnabled)
+ ret = true;
+
+ gc_free (&gc);
+ return ret;
+}
+
+/*
+ * Delete all temporary address/netmask pairs which were added
+ * to adapter (given by index) by previous calls to AddIPAddress.
+ */
+static void
+delete_temp_addresses (DWORD index)
+{
+ struct gc_arena gc = gc_new ();
+ const IP_ADAPTER_INFO *a = get_adapter_info (index, &gc);
+
+ if (a)
+ {
+ const IP_ADDR_STRING *ip = &a->IpAddressList;
+ while (ip)
+ {
+ DWORD status;
+ const DWORD context = ip->Context;
+
+ if ((status = DeleteIPAddress ((ULONG) context)) == NO_ERROR)
+ {
+ msg (M_INFO, "Successfully deleted previously set dynamic IP/netmask: %s/%s",
+ ip->IpAddress.String,
+ ip->IpMask.String);
+ }
+ else
+ {
+ const char *empty = "0.0.0.0";
+ if (strcmp (ip->IpAddress.String, empty)
+ || strcmp (ip->IpMask.String, empty))
+ msg (M_INFO, "NOTE: could not delete previously set dynamic IP/netmask: %s/%s (status=%u)",
+ ip->IpAddress.String,
+ ip->IpMask.String,
+ (unsigned int)status);
+ }
+ ip = ip->Next;
+ }
+ }
+ gc_free (&gc);
+}
+
+/*
+ * Get interface index for use with IP Helper API functions.
+ */
+static DWORD
+get_interface_index (const char *guid)
+{
+ struct gc_arena gc = gc_new ();
+ ULONG index;
+ DWORD status;
+ wchar_t wbuf[256];
+ snwprintf (wbuf, SIZE (wbuf), L"\\DEVICE\\TCPIP_%S", guid);
+ wbuf [SIZE(wbuf) - 1] = 0;
+ if ((status = GetAdapterIndex (wbuf, &index)) != NO_ERROR)
+ {
+ msg (M_INFO, "NOTE: could not get adapter index for %S, status=%u : %s",
+ wbuf,
+ (unsigned int)status,
+ strerror_win32 (status, &gc));
+ gc_free (&gc);
+ return (DWORD)~0;
+ }
+ else
+ {
+ gc_free (&gc);
+ return index;
+ }
+}
+
+/*
+ * Return a string representing a PIP_ADDR_STRING
+ */
+static const char *
+format_ip_addr_string (const IP_ADDR_STRING *ip, struct gc_arena *gc)
+{
+ struct buffer out = alloc_buf_gc (256, gc);
+ while (ip)
+ {
+ buf_printf (&out, "%s", ip->IpAddress.String);
+ if (strlen (ip->IpMask.String))
+ {
+ buf_printf (&out, "/");
+ buf_printf (&out, "%s", ip->IpMask.String);
+ }
+ buf_printf (&out, " ");
+ ip = ip->Next;
+ }
+ return BSTR (&out);
+}
+
+/*
+ * Show info for a single adapter
+ */
+static void
+show_adapter (int msglev, const IP_ADAPTER_INFO *a, struct gc_arena *gc)
+{
+ msg (msglev, "%s", a->Description);
+ msg (msglev, " Index = %d", (int)a->Index);
+ msg (msglev, " GUID = %s", a->AdapterName);
+ msg (msglev, " IP = %s", format_ip_addr_string (&a->IpAddressList, gc));
+ msg (msglev, " MAC = %s", format_hex_ex (a->Address, a->AddressLength, 0, 1, ":", gc));
+ msg (msglev, " GATEWAY = %s", format_ip_addr_string (&a->GatewayList, gc));
+ if (a->DhcpEnabled)
+ {
+ msg (msglev, " DHCP SERV = %s", format_ip_addr_string (&a->DhcpServer, gc));
+ msg (msglev, " DHCP LEASE OBTAINED = %s", time_string (a->LeaseObtained, 0, false, gc));
+ msg (msglev, " DHCP LEASE EXPIRES = %s", time_string (a->LeaseExpires, 0, false, gc));
+ }
+ if (a->HaveWins)
+ {
+ msg (msglev, " PRI WINS = %s", format_ip_addr_string (&a->PrimaryWinsServer, gc));
+ msg (msglev, " SEC WINS = %s", format_ip_addr_string (&a->SecondaryWinsServer, gc));
+ }
+}
+
+/*
+ * Show current adapter list
+ */
+void
+show_adapters (int msglev)
+{
+ struct gc_arena gc = gc_new ();
+ const IP_ADAPTER_INFO *ai = get_adapter_info_list (&gc);
+
+ msg (msglev, "SYSTEM ADAPTER LIST");
+ if (ai)
+ {
+ const IP_ADAPTER_INFO *a;
+
+ /* find index in the linked list */
+ for (a = ai; a != NULL; a = a->Next)
+ {
+ show_adapter (msglev, a, &gc);
+ }
+ }
+ gc_free (&gc);
+}
+
+/*
+ * DHCP release/renewal
+ */
+
+bool
+dhcp_release (const struct tuntap *tt)
+{
+ struct gc_arena gc = gc_new ();
+ bool ret = false;
+ if (tt && tt->options.ip_win32_type == IPW32_SET_DHCP_MASQ && tt->adapter_index != ~0)
+ {
+ const IP_ADAPTER_INDEX_MAP *inter = get_interface_info (tt->adapter_index, &gc);
+ if (inter)
+ {
+ DWORD status = IpReleaseAddress ((IP_ADAPTER_INDEX_MAP *)inter);
+ if (status == NO_ERROR)
+ {
+ msg (D_TUNTAP_INFO, "TAP: DHCP address released");
+ ret = true;
+ }
+ else
+ msg (M_WARN, "NOTE: Release of DHCP-assigned IP address lease on TAP-Win32 adapter failed: %s (code=%u)",
+ strerror_win32 (status, &gc),
+ (unsigned int)status);
+ }
+ }
+ gc_free (&gc);
+ return ret;
+}
+
+bool
+dhcp_renew (const struct tuntap *tt)
+{
+ struct gc_arena gc = gc_new ();
+ bool ret = false;
+ if (tt && tt->options.ip_win32_type == IPW32_SET_DHCP_MASQ && tt->adapter_index != ~0)
+ {
+ const IP_ADAPTER_INDEX_MAP *inter = get_interface_info (tt->adapter_index, &gc);
+ if (inter)
+ {
+ DWORD status = IpRenewAddress ((IP_ADAPTER_INDEX_MAP *)inter);
+ if (status == NO_ERROR)
+ {
+ msg (D_TUNTAP_INFO, "TAP: DHCP address renewal succeeded");
+ ret = true;
+ }
+ else
+ msg (M_WARN, "WARNING: Failed to renew DHCP IP address lease on TAP-Win32 adapter: %s (code=%u)",
+ strerror_win32 (status, &gc),
+ (unsigned int)status);
+ }
+ }
+ gc_free (&gc);
+ return ret;
+}
+
+/*
+ * Convert DHCP options from the command line / config file
+ * into a raw DHCP-format options string.
+ */
+
+static void
+write_dhcp_u8 (struct buffer *buf, const int type, const int data)
+{
+ if (!buf_safe (buf, 3))
+ msg (M_FATAL, "write_dhcp_u8: buffer overflow building DHCP options");
+ buf_write_u8 (buf, type);
+ buf_write_u8 (buf, 1);
+ buf_write_u8 (buf, data);
+}
+
+static void
+write_dhcp_u32_array (struct buffer *buf, const int type, const uint32_t *data, const unsigned int len)
+{
+ if (len > 0)
+ {
+ int i;
+ const int size = len * sizeof (uint32_t);
+
+ if (!buf_safe (buf, 2 + size))
+ msg (M_FATAL, "write_dhcp_u32_array: buffer overflow building DHCP options");
+ if (size < 1 || size > 255)
+ msg (M_FATAL, "write_dhcp_u32_array: size (%d) must be > 0 and <= 255", size);
+ buf_write_u8 (buf, type);
+ buf_write_u8 (buf, size);
+ for (i = 0; i < len; ++i)
+ buf_write_u32 (buf, data[i]);
+ }
+}
+
+static void
+write_dhcp_str (struct buffer *buf, const int type, const char *str)
+{
+ const int len = strlen (str);
+ if (!buf_safe (buf, 2 + len))
+ msg (M_FATAL, "write_dhcp_str: buffer overflow building DHCP options");
+ if (len < 1 || len > 255)
+ msg (M_FATAL, "write_dhcp_str: string '%s' must be > 0 bytes and <= 255 bytes", str);
+ buf_write_u8 (buf, type);
+ buf_write_u8 (buf, len);
+ buf_write (buf, str, len);
+}
+
+static void
+build_dhcp_options_string (struct buffer *buf, const struct tuntap_options *o)
+{
+ if (o->domain)
+ write_dhcp_str (buf, 15, o->domain);
+
+ if (o->netbios_scope)
+ write_dhcp_str (buf, 47, o->netbios_scope);
+
+ if (o->netbios_node_type)
+ write_dhcp_u8 (buf, 46, o->netbios_node_type);
+
+ write_dhcp_u32_array (buf, 6, (uint32_t*)o->dns, o->dns_len);
+ write_dhcp_u32_array (buf, 44, (uint32_t*)o->wins, o->wins_len);
+ write_dhcp_u32_array (buf, 42, (uint32_t*)o->ntp, o->ntp_len);
+ write_dhcp_u32_array (buf, 45, (uint32_t*)o->nbdd, o->nbdd_len);
+
+ /* the MS DHCP server option 'Disable Netbios-over-TCP/IP
+ is implemented as vendor option 001, value 002.
+ A value of 001 means 'leave NBT alone' which is the default */
+ if (o->disable_nbt)
+ {
+ buf_write_u8 (buf, 43);
+ buf_write_u8 (buf, 6); /* total length field */
+ buf_write_u8 (buf, 0x001);
+ buf_write_u8 (buf, 4); /* length of the vendor specified field */
+ buf_write_u32 (buf, 0x002);
+ }
+}
+
+void
+open_tun (const char *dev, const char *dev_type, const char *dev_node, bool ipv6, struct tuntap *tt)
+{
+ struct gc_arena gc = gc_new ();
+ char device_path[256];
+ const char *device_guid = NULL;
+ DWORD len;
+
+ /*netcmd_semaphore_lock ();*/
+
+ ipv6_support (ipv6, false, tt);
+
+ if (tt->type == DEV_TYPE_NULL)
+ {
+ open_null (tt);
+ gc_free (&gc);
+ return;
+ }
+ else if (tt->type == DEV_TYPE_TAP || tt->type == DEV_TYPE_TUN)
+ {
+ ;
+ }
+ else
+ {
+ msg (M_FATAL|M_NOPREFIX, "Unknown virtual device type: '%s'", dev);
+ }
+
+ /*
+ * Lookup the device name in the registry, using the --dev-node high level name.
+ */
+ {
+ const struct tap_reg *tap_reg = get_tap_reg (&gc);
+ const struct panel_reg *panel_reg = get_panel_reg (&gc);
+ char guid_buffer[256];
+
+ at_least_one_tap_win32 (tap_reg);
+
+ if (dev_node)
+ {
+ /* Get the device GUID for the device specified with --dev-node. */
+ device_guid = get_device_guid (dev_node, guid_buffer, sizeof (guid_buffer), tap_reg, panel_reg, &gc);
+
+ if (!device_guid)
+ msg (M_FATAL, "TAP-Win32 adapter '%s' not found", dev_node);
+
+ /* Open Windows TAP-Win32 adapter */
+ openvpn_snprintf (device_path, sizeof(device_path), "%s%s%s",
+ USERMODEDEVICEDIR,
+ device_guid,
+ TAPSUFFIX);
+
+ tt->hand = CreateFile (
+ device_path,
+ GENERIC_READ | GENERIC_WRITE,
+ 0, /* was: FILE_SHARE_READ */
+ 0,
+ OPEN_EXISTING,
+ FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED,
+ 0
+ );
+
+ if (tt->hand == INVALID_HANDLE_VALUE)
+ msg (M_ERR, "CreateFile failed on TAP device: %s", device_path);
+ }
+ else
+ {
+ int device_number = 0;
+
+ /* Try opening all TAP devices until we find one available */
+ while (true)
+ {
+ device_guid = get_unspecified_device_guid (device_number,
+ guid_buffer,
+ sizeof (guid_buffer),
+ tap_reg,
+ panel_reg,
+ &gc);
+
+ if (!device_guid)
+ msg (M_FATAL, "All TAP-Win32 adapters on this system are currently in use.");
+
+ /* Open Windows TAP-Win32 adapter */
+ openvpn_snprintf (device_path, sizeof(device_path), "%s%s%s",
+ USERMODEDEVICEDIR,
+ device_guid,
+ TAPSUFFIX);
+
+ tt->hand = CreateFile (
+ device_path,
+ GENERIC_READ | GENERIC_WRITE,
+ 0, /* was: FILE_SHARE_READ */
+ 0,
+ OPEN_EXISTING,
+ FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED,
+ 0
+ );
+
+ if (tt->hand == INVALID_HANDLE_VALUE)
+ msg (D_TUNTAP_INFO, "CreateFile failed on TAP device: %s", device_path);
+ else
+ break;
+
+ device_number++;
+ }
+ }
+
+ /* translate high-level device name into a device instance
+ GUID using the registry */
+ tt->actual_name = string_alloc (guid_buffer, NULL);
+ }
+
+ msg (M_INFO, "TAP-WIN32 device [%s] opened: %s", tt->actual_name, device_path);
+
+ /* get driver version info */
+ {
+ ULONG info[3];
+ CLEAR (info);
+ if (DeviceIoControl (tt->hand, TAP_IOCTL_GET_VERSION,
+ &info, sizeof (info),
+ &info, sizeof (info), &len, NULL))
+ {
+ msg (D_TUNTAP_INFO, "TAP-Win32 Driver Version %d.%d %s",
+ (int) info[0],
+ (int) info[1],
+ (info[2] ? "(DEBUG)" : ""));
+
+ }
+ if ( !(info[0] > TAP_WIN32_MIN_MAJOR
+ || (info[0] == TAP_WIN32_MIN_MAJOR && info[1] >= TAP_WIN32_MIN_MINOR)) )
+ msg (M_FATAL, "ERROR: This version of " PACKAGE_NAME " requires a TAP-Win32 driver that is at least version %d.%d -- If you recently upgraded your " PACKAGE_NAME " distribution, a reboot is probably required at this point to get Windows to see the new driver.",
+ TAP_WIN32_MIN_MAJOR,
+ TAP_WIN32_MIN_MINOR);
+ }
+
+ /* get driver MTU */
+ {
+ ULONG mtu;
+ if (DeviceIoControl (tt->hand, TAP_IOCTL_GET_MTU,
+ &mtu, sizeof (mtu),
+ &mtu, sizeof (mtu), &len, NULL))
+ {
+ tt->post_open_mtu = (int) mtu;
+ msg (D_MTU_INFO, "TAP-Win32 MTU=%d", (int) mtu);
+ }
+ }
+
+ /* set point-to-point mode if TUN device */
+
+ if (tt->type == DEV_TYPE_TUN)
+ {
+ in_addr_t ep[2];
+ ep[0] = htonl (tt->local);
+ ep[1] = htonl (tt->remote_netmask);
+ if (!tt->did_ifconfig_setup)
+ {
+ msg (M_FATAL, "ERROR: --dev tun also requires --ifconfig");
+ }
+ if (!DeviceIoControl (tt->hand, TAP_IOCTL_CONFIG_POINT_TO_POINT,
+ ep, sizeof (ep),
+ ep, sizeof (ep), &len, NULL))
+ msg (M_FATAL, "ERROR: The TAP-Win32 driver rejected a DeviceIoControl call to set Point-to-Point mode, which is required for --dev tun");
+ }
+
+ /* should we tell the TAP-Win32 driver to masquerade as a DHCP server as a means
+ of setting the adapter address? */
+ if (tt->did_ifconfig_setup && tt->options.ip_win32_type == IPW32_SET_DHCP_MASQ)
+ {
+ uint32_t ep[4];
+
+ /* We will answer DHCP requests with a reply to set IP/subnet to these values */
+ ep[0] = htonl (tt->local);
+ ep[1] = htonl (tt->adapter_netmask);
+
+ /* At what IP address should the DHCP server masquerade at? */
+ if (tt->type == DEV_TYPE_TUN)
+ {
+ ep[2] = htonl (tt->remote_netmask);
+ if (tt->options.dhcp_masq_custom_offset)
+ msg (M_WARN, "WARNING: because you are using '--dev tun' mode, the '--ip-win32 dynamic [offset]' option is ignoring the offset parameter");
+ }
+ else
+ {
+ in_addr_t dsa; /* DHCP server addr */
+
+ ASSERT (tt->type == DEV_TYPE_TAP);
+
+ if (tt->options.dhcp_masq_offset < 0)
+ dsa = (tt->local | (~tt->adapter_netmask)) + tt->options.dhcp_masq_offset;
+ else
+ dsa = (tt->local & tt->adapter_netmask) + tt->options.dhcp_masq_offset;
+
+ if (dsa == tt->local)
+ msg (M_FATAL, "ERROR: There is a clash between the --ifconfig local address and the internal DHCP server address -- both are set to %s -- please use the --ip-win32 dynamic option to choose a different free address from the --ifconfig subnet for the internal DHCP server", print_in_addr_t (dsa, 0, &gc));
+
+ if ((tt->local & tt->adapter_netmask) != (dsa & tt->adapter_netmask))
+ msg (M_FATAL, "ERROR: --tap-win32 dynamic [offset] : offset is outside of --ifconfig subnet");
+
+ ep[2] = htonl (dsa);
+ }
+
+ /* lease time in seconds */
+ ep[3] = (uint32_t) tt->options.dhcp_lease_time;
+
+ ASSERT (ep[3] > 0);
+
+ if (!DeviceIoControl (tt->hand, TAP_IOCTL_CONFIG_DHCP_MASQ,
+ ep, sizeof (ep),
+ ep, sizeof (ep), &len, NULL))
+ msg (M_FATAL, "ERROR: The TAP-Win32 driver rejected a DeviceIoControl call to set TAP_IOCTL_CONFIG_DHCP_MASQ mode");
+
+ msg (M_INFO, "Notified TAP-Win32 driver to set a DHCP IP/netmask of %s/%s on interface %s [DHCP-serv: %s, lease-time: %d]",
+ print_in_addr_t (tt->local, 0, &gc),
+ print_in_addr_t (tt->adapter_netmask, 0, &gc),
+ device_guid,
+ print_in_addr_t (ep[2], IA_NET_ORDER, &gc),
+ ep[3]
+ );
+
+ /* user-supplied DHCP options capability */
+ if (tt->options.dhcp_options)
+ {
+ struct buffer buf = alloc_buf (256);
+ build_dhcp_options_string (&buf, &tt->options);
+ msg (D_DHCP_OPT, "DHCP option string: %s", format_hex (BPTR (&buf), BLEN (&buf), 0, &gc));
+ if (!DeviceIoControl (tt->hand, TAP_IOCTL_CONFIG_DHCP_SET_OPT,
+ BPTR (&buf), BLEN (&buf),
+ BPTR (&buf), BLEN (&buf), &len, NULL))
+ msg (M_FATAL, "ERROR: The TAP-Win32 driver rejected a TAP_IOCTL_CONFIG_DHCP_SET_OPT DeviceIoControl call");
+ free_buf (&buf);
+ }
+ }
+
+ /* set driver media status to 'connected' */
+ {
+ ULONG status = TRUE;
+ if (!DeviceIoControl (tt->hand, TAP_IOCTL_SET_MEDIA_STATUS,
+ &status, sizeof (status),
+ &status, sizeof (status), &len, NULL))
+ msg (M_WARN, "WARNING: The TAP-Win32 driver rejected a TAP_IOCTL_SET_MEDIA_STATUS DeviceIoControl call.");
+ }
+
+ /* possible wait for adapter to come up */
+ {
+ int s = tt->options.tap_sleep;
+ if (s > 0)
+ {
+ msg (M_INFO, "Sleeping for %d seconds...", s);
+ openvpn_sleep (s);
+ }
+ }
+
+ /* possibly use IP Helper API to set IP address on adapter */
+ {
+ DWORD index = get_interface_index (device_guid);
+ tt->adapter_index = index;
+
+ /* flush arp cache */
+ if (index != (DWORD)~0)
+ {
+ DWORD status;
+
+ if ((status = FlushIpNetTable (index)) == NO_ERROR)
+ msg (M_INFO, "Successful ARP Flush on interface [%u] %s",
+ (unsigned int)index,
+ device_guid);
+ else
+ msg (M_WARN, "NOTE: FlushIpNetTable failed on interface [%u] %s (status=%u) : %s",
+ (unsigned int)index,
+ device_guid,
+ (unsigned int)status,
+ strerror_win32 (status, &gc));
+ }
+
+ /*
+ * If the TAP-Win32 driver is masquerading as a DHCP server
+ * make sure the TCP/IP properties for the adapter are
+ * set correctly.
+ */
+ if (tt->did_ifconfig_setup && tt->options.ip_win32_type == IPW32_SET_DHCP_MASQ)
+ {
+ /* check dhcp enable status */
+ if (dhcp_disabled (index))
+ msg (M_WARN, "WARNING: You have selected '--ip-win32 dynamic', which will not work unless the TAP-Win32 TCP/IP properties are set to 'Obtain an IP address automatically'");
+
+ /* force an explicit DHCP lease renewal on TAP adapter? */
+ if (tt->options.dhcp_pre_release)
+ dhcp_release (tt);
+ if (tt->options.dhcp_renew)
+ dhcp_renew (tt);
+ }
+
+ if (tt->did_ifconfig_setup && tt->options.ip_win32_type == IPW32_SET_IPAPI)
+ {
+ DWORD status;
+ const char *error_suffix = "I am having trouble using the Windows 'IP helper API' to automatically set the IP address -- consider using other --ip-win32 methods (not 'ipapi')";
+
+ /* couldn't get adapter index */
+ if (index == (DWORD)~0)
+ {
+ msg (M_FATAL, "ERROR: unable to get adapter index for interface %s -- %s",
+ device_guid,
+ error_suffix);
+ }
+
+ /* check dhcp enable status */
+ if (dhcp_disabled (index))
+ msg (M_WARN, "NOTE: You have selected (explicitly or by default) '--ip-win32 ipapi', which has a better chance of working correctly if the TAP-Win32 TCP/IP properties are set to 'Obtain an IP address automatically'");
+
+ /* delete previously added IP addresses which were not
+ correctly deleted */
+ delete_temp_addresses (index);
+
+ /* add a new IP address */
+ if ((status = AddIPAddress (htonl(tt->local),
+ htonl(tt->adapter_netmask),
+ index,
+ &tt->ipapi_context,
+ &tt->ipapi_instance)) == NO_ERROR)
+ msg (M_INFO, "Succeeded in adding a temporary IP/netmask of %s/%s to interface %s using the Win32 IP Helper API",
+ print_in_addr_t (tt->local, 0, &gc),
+ print_in_addr_t (tt->adapter_netmask, 0, &gc),
+ device_guid
+ );
+ else
+ msg (M_FATAL, "ERROR: AddIPAddress %s/%s failed on interface %s, index=%d, status=%u (windows error: '%s') -- %s",
+ print_in_addr_t (tt->local, 0, &gc),
+ print_in_addr_t (tt->adapter_netmask, 0, &gc),
+ device_guid,
+ (int)index,
+ (unsigned int)status,
+ strerror_win32 (status, &gc),
+ error_suffix);
+ tt->ipapi_context_defined = true;
+ }
+ }
+ /*netcmd_semaphore_release ();*/
+ gc_free (&gc);
+}
+
+const char *
+tap_win32_getinfo (const struct tuntap *tt, struct gc_arena *gc)
+{
+ if (tt && tt->hand != NULL)
+ {
+ struct buffer out = alloc_buf_gc (256, gc);
+ DWORD len;
+ if (DeviceIoControl (tt->hand, TAP_IOCTL_GET_INFO,
+ BSTR (&out), BCAP (&out),
+ BSTR (&out), BCAP (&out),
+ &len, NULL))
+ {
+ return BSTR (&out);
+ }
+ }
+ return NULL;
+}
+
+void
+tun_show_debug (struct tuntap *tt)
+{
+ if (tt && tt->hand != NULL)
+ {
+ struct buffer out = alloc_buf (1024);
+ DWORD len;
+ while (DeviceIoControl (tt->hand, TAP_IOCTL_GET_LOG_LINE,
+ BSTR (&out), BCAP (&out),
+ BSTR (&out), BCAP (&out),
+ &len, NULL))
+ {
+ msg (D_TAP_WIN32_DEBUG, "TAP-Win32: %s", BSTR (&out));
+ }
+ free_buf (&out);
+ }
+}
+
+void
+close_tun (struct tuntap *tt)
+{
+ struct gc_arena gc = gc_new ();
+
+ if (tt)
+ {
+#if 1
+ if (tt->ipapi_context_defined)
+ {
+ DWORD status;
+ if ((status = DeleteIPAddress (tt->ipapi_context)) != NO_ERROR)
+ {
+ msg (M_WARN, "Warning: DeleteIPAddress[%u] failed on TAP-Win32 adapter, status=%u : %s",
+ (unsigned int)tt->ipapi_context,
+ (unsigned int)status,
+ strerror_win32 (status, &gc));
+ }
+ }
+#endif
+
+ if (tt->options.dhcp_release)
+ dhcp_release (tt);
+
+ if (tt->hand != NULL)
+ {
+ dmsg (D_WIN32_IO_LOW, "Attempting CancelIO on TAP-Win32 adapter");
+ if (!CancelIo (tt->hand))
+ msg (M_WARN | M_ERRNO, "Warning: CancelIO failed on TAP-Win32 adapter");
+ }
+
+ dmsg (D_WIN32_IO_LOW, "Attempting close of overlapped read event on TAP-Win32 adapter");
+ overlapped_io_close (&tt->reads);
+
+ dmsg (D_WIN32_IO_LOW, "Attempting close of overlapped write event on TAP-Win32 adapter");
+ overlapped_io_close (&tt->writes);
+
+ if (tt->hand != NULL)
+ {
+ dmsg (D_WIN32_IO_LOW, "Attempting CloseHandle on TAP-Win32 adapter");
+ if (!CloseHandle (tt->hand))
+ msg (M_WARN | M_ERRNO, "Warning: CloseHandle failed on TAP-Win32 adapter");
+ }
+
+ if (tt->actual_name)
+ free (tt->actual_name);
+
+ clear_tuntap (tt);
+ free (tt);
+ }
+ gc_free (&gc);
+}
+
+/*
+ * Convert --ip-win32 constants between index and ascii form.
+ */
+
+struct ipset_names {
+ const char *short_form;
+};
+
+/* Indexed by IPW32_SET_x */
+static const struct ipset_names ipset_names[] = {
+ {"manual"},
+ {"netsh"},
+ {"ipapi"},
+ {"dynamic"}
+};
+
+int
+ascii2ipset (const char* name)
+{
+ int i;
+ ASSERT (IPW32_SET_N == SIZE (ipset_names));
+ for (i = 0; i < IPW32_SET_N; ++i)
+ if (!strcmp (name, ipset_names[i].short_form))
+ return i;
+ return -1;
+}
+
+const char *
+ipset2ascii (int index)
+{
+ ASSERT (IPW32_SET_N == SIZE (ipset_names));
+ if (index < 0 || index >= IPW32_SET_N)
+ return "[unknown --ip-win32 type]";
+ else
+ return ipset_names[index].short_form;
+}
+
+const char *
+ipset2ascii_all (struct gc_arena *gc)
+{
+ struct buffer out = alloc_buf_gc (256, gc);
+ int i;
+
+ ASSERT (IPW32_SET_N == SIZE (ipset_names));
+ for (i = 0; i < IPW32_SET_N; ++i)
+ {
+ if (i)
+ buf_printf(&out, " ");
+ buf_printf(&out, "[%s]", ipset2ascii(i));
+ }
+ return BSTR (&out);
+}
+
+#else /* generic */
+
+void
+open_tun (const char *dev, const char *dev_type, const char *dev_node, bool ipv6, struct tuntap *tt)
+{
+ open_tun_generic (dev, dev_type, dev_node, ipv6, false, true, tt);
+}
+
+void
+close_tun (struct tuntap* tt)
+{
+ if (tt)
+ {
+ close_tun_generic (tt);
+ free (tt);
+ }
+}
+
+int
+write_tun (struct tuntap* tt, uint8_t *buf, int len)
+{
+ return write (tt->fd, buf, len);
+}
+
+int
+read_tun (struct tuntap* tt, uint8_t *buf, int len)
+{
+ return read (tt->fd, buf, len);
+}
+
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 04:41:58 +0000