summaryrefslogtreecommitdiff
path: root/route.c
diff options
context:
space:
mode:
Diffstat (limited to 'route.c')
-rw-r--r--route.c2404
1 files changed, 2404 insertions, 0 deletions
diff --git a/route.c b/route.c
new file mode 100644
index 0000000..b5092fe
--- /dev/null
+++ b/route.c
@@ -0,0 +1,2404 @@
+/*
+ * 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) 2002-2010 OpenVPN Technologies, Inc. <sales@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 adding/deleting network routes.
+ */
+
+#include "syshead.h"
+
+#include "common.h"
+#include "error.h"
+#include "route.h"
+#include "misc.h"
+#include "socket.h"
+#include "manage.h"
+#include "win32.h"
+
+#include "memdbg.h"
+
+static void delete_route (const struct route *r, const struct tuntap *tt, unsigned int flags, const struct env_set *es);
+static void get_bypass_addresses (struct route_bypass *rb, const unsigned int flags);
+
+#ifdef ENABLE_DEBUG
+
+static void
+print_bypass_addresses (const struct route_bypass *rb)
+{
+ struct gc_arena gc = gc_new ();
+ int i;
+ for (i = 0; i < rb->n_bypass; ++i)
+ {
+ msg (D_ROUTE, "ROUTE: bypass_host_route[%d]=%s",
+ i,
+ print_in_addr_t (rb->bypass[i], 0, &gc));
+ }
+ gc_free (&gc);
+}
+
+#endif
+
+struct route_option_list *
+new_route_option_list (const int max_routes, struct gc_arena *a)
+{
+ struct route_option_list *ret;
+ ALLOC_VAR_ARRAY_CLEAR_GC (ret, struct route_option_list, struct route_option, max_routes, a);
+ ret->capacity = max_routes;
+ return ret;
+}
+
+struct route_option_list *
+clone_route_option_list (const struct route_option_list *src, struct gc_arena *a)
+{
+ const size_t rl_size = array_mult_safe (sizeof(struct route_option), src->capacity, sizeof(struct route_option_list));
+ struct route_option_list *ret = gc_malloc (rl_size, false, a);
+ memcpy (ret, src, rl_size);
+ return ret;
+}
+
+void
+copy_route_option_list (struct route_option_list *dest, const struct route_option_list *src)
+{
+ const size_t src_size = array_mult_safe (sizeof(struct route_option), src->capacity, sizeof(struct route_option_list));
+ if (src->n > dest->capacity)
+ msg (M_FATAL, PACKAGE_NAME " ROUTE: (copy) number of route options in src (%d) is greater than route list capacity in dest (%d)", src->n, dest->capacity);
+ memcpy (dest, src, src_size);
+}
+
+struct route_list *
+new_route_list (const int max_routes, struct gc_arena *a)
+{
+ struct route_list *ret;
+ ALLOC_VAR_ARRAY_CLEAR_GC (ret, struct route_list, struct route, max_routes, a);
+ ret->capacity = max_routes;
+ return ret;
+}
+
+static const char *
+route_string (const struct route *r, struct gc_arena *gc)
+{
+ struct buffer out = alloc_buf_gc (256, gc);
+ buf_printf (&out, "ROUTE network %s netmask %s gateway %s",
+ print_in_addr_t (r->network, 0, gc),
+ print_in_addr_t (r->netmask, 0, gc),
+ print_in_addr_t (r->gateway, 0, gc)
+ );
+ if (r->metric_defined)
+ buf_printf (&out, " metric %d", r->metric);
+ return BSTR (&out);
+}
+
+static bool
+is_route_parm_defined (const char *parm)
+{
+ if (!parm)
+ return false;
+ if (!strcmp (parm, "default"))
+ return false;
+ return true;
+}
+
+static void
+setenv_route_addr (struct env_set *es, const char *key, const in_addr_t addr, int i)
+{
+ struct gc_arena gc = gc_new ();
+ struct buffer name = alloc_buf_gc (256, &gc);
+ if (i >= 0)
+ buf_printf (&name, "route_%s_%d", key, i);
+ else
+ buf_printf (&name, "route_%s", key);
+ setenv_str (es, BSTR (&name), print_in_addr_t (addr, 0, &gc));
+ gc_free (&gc);
+}
+
+static bool
+get_special_addr (const struct route_special_addr *spec,
+ const char *string,
+ in_addr_t *out,
+ bool *status)
+{
+ if (status)
+ *status = true;
+ if (!strcmp (string, "vpn_gateway"))
+ {
+ if (spec)
+ {
+ if (spec->remote_endpoint_defined)
+ *out = spec->remote_endpoint;
+ else
+ {
+ msg (M_INFO, PACKAGE_NAME " ROUTE: vpn_gateway undefined");
+ if (status)
+ *status = false;
+ }
+ }
+ return true;
+ }
+ else if (!strcmp (string, "net_gateway"))
+ {
+ if (spec)
+ {
+ if (spec->net_gateway_defined)
+ *out = spec->net_gateway;
+ else
+ {
+ msg (M_INFO, PACKAGE_NAME " ROUTE: net_gateway undefined -- unable to get default gateway from system");
+ if (status)
+ *status = false;
+ }
+ }
+ return true;
+ }
+ else if (!strcmp (string, "remote_host"))
+ {
+ if (spec)
+ {
+ if (spec->remote_host_defined)
+ *out = spec->remote_host;
+ else
+ {
+ msg (M_INFO, PACKAGE_NAME " ROUTE: remote_host undefined");
+ if (status)
+ *status = false;
+ }
+ }
+ return true;
+ }
+ return false;
+}
+
+bool
+is_special_addr (const char *addr_str)
+{
+ if (addr_str)
+ return get_special_addr (NULL, addr_str, NULL, NULL);
+ else
+ return false;
+}
+
+static bool
+init_route (struct route *r,
+ struct resolve_list *network_list,
+ const struct route_option *ro,
+ const struct route_special_addr *spec)
+{
+ const in_addr_t default_netmask = ~0;
+ bool status;
+
+ r->option = ro;
+ r->defined = false;
+
+ /* network */
+
+ if (!is_route_parm_defined (ro->network))
+ {
+ goto fail;
+ }
+
+ if (!get_special_addr (spec, ro->network, &r->network, &status))
+ {
+ r->network = getaddr_multi (
+ GETADDR_RESOLVE
+ | GETADDR_HOST_ORDER
+ | GETADDR_WARN_ON_SIGNAL,
+ ro->network,
+ 0,
+ &status,
+ NULL,
+ network_list);
+ }
+
+ if (!status)
+ goto fail;
+
+ /* netmask */
+
+ if (is_route_parm_defined (ro->netmask))
+ {
+ r->netmask = getaddr (
+ GETADDR_HOST_ORDER
+ | GETADDR_WARN_ON_SIGNAL,
+ ro->netmask,
+ 0,
+ &status,
+ NULL);
+ if (!status)
+ goto fail;
+ }
+ else
+ r->netmask = default_netmask;
+
+ /* gateway */
+
+ if (is_route_parm_defined (ro->gateway))
+ {
+ if (!get_special_addr (spec, ro->gateway, &r->gateway, &status))
+ {
+ r->gateway = getaddr (
+ GETADDR_RESOLVE
+ | GETADDR_HOST_ORDER
+ | GETADDR_WARN_ON_SIGNAL,
+ ro->gateway,
+ 0,
+ &status,
+ NULL);
+ }
+ if (!status)
+ goto fail;
+ }
+ else
+ {
+ if (spec->remote_endpoint_defined)
+ r->gateway = spec->remote_endpoint;
+ else
+ {
+ msg (M_WARN, PACKAGE_NAME " ROUTE: " PACKAGE_NAME " needs a gateway parameter for a --route option and no default was specified by either --route-gateway or --ifconfig options");
+ goto fail;
+ }
+ }
+
+ /* metric */
+
+ r->metric_defined = false;
+ r->metric = 0;
+ if (is_route_parm_defined (ro->metric))
+ {
+ r->metric = atoi (ro->metric);
+ if (r->metric < 0)
+ {
+ msg (M_WARN, PACKAGE_NAME " ROUTE: route metric for network %s (%s) must be >= 0",
+ ro->network,
+ ro->metric);
+ goto fail;
+ }
+ r->metric_defined = true;
+ }
+ else if (spec->default_metric_defined)
+ {
+ r->metric = spec->default_metric;
+ r->metric_defined = true;
+ }
+
+ r->defined = true;
+
+ return true;
+
+ fail:
+ msg (M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve route for host/network: %s",
+ ro->network);
+ r->defined = false;
+ return false;
+}
+
+void
+add_route_to_option_list (struct route_option_list *l,
+ const char *network,
+ const char *netmask,
+ const char *gateway,
+ const char *metric)
+{
+ struct route_option *ro;
+ if (l->n >= l->capacity)
+ msg (M_FATAL, PACKAGE_NAME " ROUTE: cannot add more than %d routes -- please increase the max-routes option in the client configuration file",
+ l->capacity);
+ ro = &l->routes[l->n];
+ ro->network = network;
+ ro->netmask = netmask;
+ ro->gateway = gateway;
+ ro->metric = metric;
+ ++l->n;
+}
+
+void
+clear_route_list (struct route_list *rl)
+{
+ const int capacity = rl->capacity;
+ const size_t rl_size = array_mult_safe (sizeof(struct route), capacity, sizeof(struct route_list));
+ memset(rl, 0, rl_size);
+ rl->capacity = capacity;
+}
+
+void
+route_list_add_default_gateway (struct route_list *rl,
+ struct env_set *es,
+ const in_addr_t addr)
+{
+ rl->spec.remote_endpoint = addr;
+ rl->spec.remote_endpoint_defined = true;
+ setenv_route_addr (es, "vpn_gateway", rl->spec.remote_endpoint, -1);
+}
+
+bool
+init_route_list (struct route_list *rl,
+ const struct route_option_list *opt,
+ const char *remote_endpoint,
+ int default_metric,
+ in_addr_t remote_host,
+ struct env_set *es)
+{
+ struct gc_arena gc = gc_new ();
+ bool ret = true;
+
+ clear_route_list (rl);
+
+ rl->flags = opt->flags;
+
+ if (remote_host)
+ {
+ rl->spec.remote_host = remote_host;
+ rl->spec.remote_host_defined = true;
+ }
+
+ if (default_metric)
+ {
+ rl->spec.default_metric = default_metric;
+ rl->spec.default_metric_defined = true;
+ }
+
+ rl->spec.net_gateway_defined = get_default_gateway (&rl->spec.net_gateway, NULL);
+ if (rl->spec.net_gateway_defined)
+ {
+ setenv_route_addr (es, "net_gateway", rl->spec.net_gateway, -1);
+ dmsg (D_ROUTE, "ROUTE default_gateway=%s", print_in_addr_t (rl->spec.net_gateway, 0, &gc));
+ }
+ else
+ {
+ dmsg (D_ROUTE, "ROUTE: default_gateway=UNDEF");
+ }
+
+ if (rl->flags & RG_ENABLE)
+ {
+ get_bypass_addresses (&rl->spec.bypass, rl->flags);
+#ifdef ENABLE_DEBUG
+ print_bypass_addresses (&rl->spec.bypass);
+#endif
+ }
+
+ if (is_route_parm_defined (remote_endpoint))
+ {
+ rl->spec.remote_endpoint = getaddr (
+ GETADDR_RESOLVE
+ | GETADDR_HOST_ORDER
+ | GETADDR_WARN_ON_SIGNAL,
+ remote_endpoint,
+ 0,
+ &rl->spec.remote_endpoint_defined,
+ NULL);
+
+ if (rl->spec.remote_endpoint_defined)
+ {
+ setenv_route_addr (es, "vpn_gateway", rl->spec.remote_endpoint, -1);
+ }
+ else
+ {
+ msg (M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve default gateway: %s",
+ remote_endpoint);
+ ret = false;
+ }
+ }
+ else
+ rl->spec.remote_endpoint_defined = false;
+
+ /* parse the routes from opt to rl */
+ {
+ int i, j = 0;
+ bool warned = false;
+ for (i = 0; i < opt->n; ++i)
+ {
+ struct resolve_list netlist;
+ struct route r;
+ int k;
+
+ CLEAR(netlist); /* init_route() will not always init this */
+
+ if (!init_route (&r,
+ &netlist,
+ &opt->routes[i],
+ &rl->spec))
+ ret = false;
+ else
+ {
+ if (!netlist.len)
+ {
+ netlist.data[0] = r.network;
+ netlist.len = 1;
+ }
+ for (k = 0; k < netlist.len; ++k)
+ {
+ if (j < rl->capacity)
+ {
+ r.network = netlist.data[k];
+ rl->routes[j++] = r;
+ }
+ else
+ {
+ if (!warned)
+ {
+ msg (M_WARN, PACKAGE_NAME " ROUTE: routes dropped because number of expanded routes is greater than route list capacity (%d)", rl->capacity);
+ warned = true;
+ }
+ }
+ }
+ }
+ }
+ rl->n = j;
+ }
+
+ gc_free (&gc);
+ return ret;
+}
+
+static void
+add_route3 (in_addr_t network,
+ in_addr_t netmask,
+ in_addr_t gateway,
+ const struct tuntap *tt,
+ unsigned int flags,
+ const struct env_set *es)
+{
+ struct route r;
+ CLEAR (r);
+ r.defined = true;
+ r.network = network;
+ r.netmask = netmask;
+ r.gateway = gateway;
+ add_route (&r, tt, flags, es);
+}
+
+static void
+del_route3 (in_addr_t network,
+ in_addr_t netmask,
+ in_addr_t gateway,
+ const struct tuntap *tt,
+ unsigned int flags,
+ const struct env_set *es)
+{
+ struct route r;
+ CLEAR (r);
+ r.defined = true;
+ r.network = network;
+ r.netmask = netmask;
+ r.gateway = gateway;
+ delete_route (&r, tt, flags, es);
+}
+
+static void
+add_bypass_routes (struct route_bypass *rb,
+ in_addr_t gateway,
+ const struct tuntap *tt,
+ unsigned int flags,
+ const struct env_set *es)
+{
+ int i;
+ for (i = 0; i < rb->n_bypass; ++i)
+ {
+ if (rb->bypass[i] != gateway)
+ add_route3 (rb->bypass[i],
+ ~0,
+ gateway,
+ tt,
+ flags,
+ es);
+ }
+}
+
+static void
+del_bypass_routes (struct route_bypass *rb,
+ in_addr_t gateway,
+ const struct tuntap *tt,
+ unsigned int flags,
+ const struct env_set *es)
+{
+ int i;
+ for (i = 0; i < rb->n_bypass; ++i)
+ {
+ if (rb->bypass[i] != gateway)
+ del_route3 (rb->bypass[i],
+ ~0,
+ gateway,
+ tt,
+ flags,
+ es);
+ }
+}
+
+static void
+redirect_default_route_to_vpn (struct route_list *rl, const struct tuntap *tt, unsigned int flags, const struct env_set *es)
+{
+ const char err[] = "NOTE: unable to redirect default gateway --";
+
+ if (rl->flags & RG_ENABLE)
+ {
+ if (!rl->spec.remote_endpoint_defined)
+ {
+ msg (M_WARN, "%s VPN gateway parameter (--route-gateway or --ifconfig) is missing", err);
+ }
+ else if (!rl->spec.net_gateway_defined)
+ {
+ msg (M_WARN, "%s Cannot read current default gateway from system", err);
+ }
+ else if (!rl->spec.remote_host_defined)
+ {
+ msg (M_WARN, "%s Cannot obtain current remote host address", err);
+ }
+ else
+ {
+ bool local = BOOL_CAST(rl->flags & RG_LOCAL);
+ if (rl->flags & RG_AUTO_LOCAL) {
+ const int tla = test_local_addr (rl->spec.remote_host);
+ if (tla == TLA_NONLOCAL)
+ {
+ dmsg (D_ROUTE, "ROUTE remote_host is NOT LOCAL");
+ local = false;
+ }
+ else if (tla == TLA_LOCAL)
+ {
+ dmsg (D_ROUTE, "ROUTE remote_host is LOCAL");
+ local = true;
+ }
+ }
+ if (!local)
+ {
+ /* route remote host to original default gateway */
+ add_route3 (rl->spec.remote_host,
+ ~0,
+ rl->spec.net_gateway,
+ tt,
+ flags,
+ es);
+ rl->did_local = true;
+ }
+
+ /* route DHCP/DNS server traffic through original default gateway */
+ add_bypass_routes (&rl->spec.bypass, rl->spec.net_gateway, tt, flags, es);
+
+ if (rl->flags & RG_REROUTE_GW)
+ {
+ if (rl->flags & RG_DEF1)
+ {
+ /* add new default route (1st component) */
+ add_route3 (0x00000000,
+ 0x80000000,
+ rl->spec.remote_endpoint,
+ tt,
+ flags,
+ es);
+
+ /* add new default route (2nd component) */
+ add_route3 (0x80000000,
+ 0x80000000,
+ rl->spec.remote_endpoint,
+ tt,
+ flags,
+ es);
+ }
+ else
+ {
+ /* delete default route */
+ del_route3 (0,
+ 0,
+ rl->spec.net_gateway,
+ tt,
+ flags,
+ es);
+
+ /* add new default route */
+ add_route3 (0,
+ 0,
+ rl->spec.remote_endpoint,
+ tt,
+ flags,
+ es);
+ }
+ }
+
+ /* set a flag so we can undo later */
+ rl->did_redirect_default_gateway = true;
+ }
+ }
+}
+
+static void
+undo_redirect_default_route_to_vpn (struct route_list *rl, const struct tuntap *tt, unsigned int flags, const struct env_set *es)
+{
+ if (rl->did_redirect_default_gateway)
+ {
+ /* delete remote host route */
+ if (rl->did_local)
+ {
+ del_route3 (rl->spec.remote_host,
+ ~0,
+ rl->spec.net_gateway,
+ tt,
+ flags,
+ es);
+ rl->did_local = false;
+ }
+
+ /* delete special DHCP/DNS bypass route */
+ del_bypass_routes (&rl->spec.bypass, rl->spec.net_gateway, tt, flags, es);
+
+ if (rl->flags & RG_REROUTE_GW)
+ {
+ if (rl->flags & RG_DEF1)
+ {
+ /* delete default route (1st component) */
+ del_route3 (0x00000000,
+ 0x80000000,
+ rl->spec.remote_endpoint,
+ tt,
+ flags,
+ es);
+
+ /* delete default route (2nd component) */
+ del_route3 (0x80000000,
+ 0x80000000,
+ rl->spec.remote_endpoint,
+ tt,
+ flags,
+ es);
+ }
+ else
+ {
+ /* delete default route */
+ del_route3 (0,
+ 0,
+ rl->spec.remote_endpoint,
+ tt,
+ flags,
+ es);
+
+ /* restore original default route */
+ add_route3 (0,
+ 0,
+ rl->spec.net_gateway,
+ tt,
+ flags,
+ es);
+ }
+ }
+
+ rl->did_redirect_default_gateway = false;
+ }
+}
+
+void
+add_routes (struct route_list *rl, const struct tuntap *tt, unsigned int flags, const struct env_set *es)
+{
+ redirect_default_route_to_vpn (rl, tt, flags, es);
+ if (!rl->routes_added)
+ {
+ int i;
+
+#ifdef ENABLE_MANAGEMENT
+ if (management && rl->n)
+ {
+ management_set_state (management,
+ OPENVPN_STATE_ADD_ROUTES,
+ NULL,
+ 0,
+ 0);
+ }
+#endif
+
+ for (i = 0; i < rl->n; ++i)
+ {
+ struct route *r = &rl->routes[i];
+ check_subnet_conflict (r->network, r->netmask, "route");
+ if (flags & ROUTE_DELETE_FIRST)
+ delete_route (r, tt, flags, es);
+ add_route (r, tt, flags, es);
+ }
+ rl->routes_added = true;
+ }
+}
+
+void
+delete_routes (struct route_list *rl, const struct tuntap *tt, unsigned int flags, const struct env_set *es)
+{
+ if (rl->routes_added)
+ {
+ int i;
+ for (i = rl->n - 1; i >= 0; --i)
+ {
+ const struct route *r = &rl->routes[i];
+ delete_route (r, tt, flags, es);
+ }
+ rl->routes_added = false;
+ }
+ undo_redirect_default_route_to_vpn (rl, tt, flags, es);
+
+ clear_route_list (rl);
+}
+
+#ifdef ENABLE_DEBUG
+
+static const char *
+show_opt (const char *option)
+{
+ if (!option)
+ return "nil";
+ else
+ return option;
+}
+
+static void
+print_route_option (const struct route_option *ro, int level)
+{
+ msg (level, " route %s/%s/%s/%s",
+ show_opt (ro->network),
+ show_opt (ro->netmask),
+ show_opt (ro->gateway),
+ show_opt (ro->metric));
+}
+
+void
+print_route_options (const struct route_option_list *rol,
+ int level)
+{
+ int i;
+ if (rol->flags & RG_ENABLE)
+ msg (level, " [redirect_default_gateway local=%d]",
+ (rol->flags & RG_LOCAL) != 0);
+ for (i = 0; i < rol->n; ++i)
+ print_route_option (&rol->routes[i], level);
+}
+
+#endif
+
+static void
+print_route (const struct route *r, int level)
+{
+ struct gc_arena gc = gc_new ();
+ if (r->defined)
+ msg (level, "%s", route_string (r, &gc));
+ gc_free (&gc);
+}
+
+void
+print_routes (const struct route_list *rl, int level)
+{
+ int i;
+ for (i = 0; i < rl->n; ++i)
+ print_route (&rl->routes[i], level);
+}
+
+static void
+setenv_route (struct env_set *es, const struct route *r, int i)
+{
+ struct gc_arena gc = gc_new ();
+ if (r->defined)
+ {
+ setenv_route_addr (es, "network", r->network, i);
+ setenv_route_addr (es, "netmask", r->netmask, i);
+ setenv_route_addr (es, "gateway", r->gateway, i);
+
+ if (r->metric_defined)
+ {
+ struct buffer name = alloc_buf_gc (256, &gc);
+ buf_printf (&name, "route_metric_%d", i);
+ setenv_int (es, BSTR (&name), r->metric);
+ }
+ }
+ gc_free (&gc);
+}
+
+void
+setenv_routes (struct env_set *es, const struct route_list *rl)
+{
+ int i;
+ for (i = 0; i < rl->n; ++i)
+ setenv_route (es, &rl->routes[i], i + 1);
+}
+
+void
+add_route (struct route *r, const struct tuntap *tt, unsigned int flags, const struct env_set *es)
+{
+ struct gc_arena gc;
+ struct argv argv;
+ const char *network;
+ const char *netmask;
+ const char *gateway;
+ bool status = false;
+
+ if (!r->defined)
+ return;
+
+ gc_init (&gc);
+ argv_init (&argv);
+
+ network = print_in_addr_t (r->network, 0, &gc);
+ netmask = print_in_addr_t (r->netmask, 0, &gc);
+ gateway = print_in_addr_t (r->gateway, 0, &gc);
+
+ /*
+ * Filter out routes which are essentially no-ops
+ */
+ if (r->network == r->gateway && r->netmask == 0xFFFFFFFF)
+ {
+ msg (M_INFO, PACKAGE_NAME " ROUTE: omitted no-op route: %s/%s -> %s",
+ network, netmask, gateway);
+ goto done;
+ }
+
+#if defined(TARGET_LINUX)
+#ifdef CONFIG_FEATURE_IPROUTE
+ argv_printf (&argv, "%s route add %s/%d via %s",
+ iproute_path,
+ network,
+ count_netmask_bits(netmask),
+ gateway);
+ if (r->metric_defined)
+ argv_printf_cat (&argv, "metric %d", r->metric);
+
+#else
+ argv_printf (&argv, "%s add -net %s netmask %s gw %s",
+ ROUTE_PATH,
+ network,
+ netmask,
+ gateway);
+ if (r->metric_defined)
+ argv_printf_cat (&argv, "metric %d", r->metric);
+#endif /*CONFIG_FEATURE_IPROUTE*/
+ argv_msg (D_ROUTE, &argv);
+ status = openvpn_execve_check (&argv, es, 0, "ERROR: Linux route add command failed");
+
+#elif defined (WIN32)
+
+ argv_printf (&argv, "%s%sc ADD %s MASK %s %s",
+ get_win_sys_path(),
+ WIN_ROUTE_PATH_SUFFIX,
+ network,
+ netmask,
+ gateway);
+ if (r->metric_defined)
+ argv_printf_cat (&argv, "METRIC %d", r->metric);
+
+ argv_msg (D_ROUTE, &argv);
+
+ if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_IPAPI)
+ {
+ status = add_route_ipapi (r, tt);
+ msg (D_ROUTE, "Route addition via IPAPI %s", status ? "succeeded" : "failed");
+ }
+ else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_EXE)
+ {
+ netcmd_semaphore_lock ();
+ status = openvpn_execve_check (&argv, es, 0, "ERROR: Windows route add command failed");
+ netcmd_semaphore_release ();
+ }
+ else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_ADAPTIVE)
+ {
+ status = add_route_ipapi (r, tt);
+ msg (D_ROUTE, "Route addition via IPAPI %s [adaptive]", status ? "succeeded" : "failed");
+ if (!status)
+ {
+ msg (D_ROUTE, "Route addition fallback to route.exe");
+ netcmd_semaphore_lock ();
+ status = openvpn_execve_check (&argv, es, 0, "ERROR: Windows route add command failed [adaptive]");
+ netcmd_semaphore_release ();
+ }
+ }
+ else
+ {
+ ASSERT (0);
+ }
+
+#elif defined (TARGET_SOLARIS)
+
+ /* example: route add 192.0.2.32 -netmask 255.255.255.224 somegateway */
+
+ argv_printf (&argv, "%s add",
+ ROUTE_PATH);
+
+ argv_printf_cat (&argv, "%s -netmask %s %s",
+ network,
+ netmask,
+ gateway);
+
+ if (r->metric_defined)
+ argv_printf_cat (&argv, "%d", r->metric);
+
+ argv_msg (D_ROUTE, &argv);
+ status = openvpn_execve_check (&argv, es, 0, "ERROR: Solaris route add command failed");
+
+#elif defined(TARGET_FREEBSD)
+
+ argv_printf (&argv, "%s add",
+ ROUTE_PATH);
+
+#if 0
+ if (r->metric_defined)
+ argv_printf_cat (&argv, "-rtt %d", r->metric);
+#endif
+
+ argv_printf_cat (&argv, "-net %s %s %s",
+ network,
+ gateway,
+ netmask);
+
+ argv_msg (D_ROUTE, &argv);
+ status = openvpn_execve_check (&argv, es, 0, "ERROR: FreeBSD route add command failed");
+
+#elif defined(TARGET_DRAGONFLY)
+
+ argv_printf (&argv, "%s add",
+ ROUTE_PATH);
+
+#if 0
+ if (r->metric_defined)
+ argv_printf_cat (&argv, "-rtt %d", r->metric);
+#endif
+
+ argv_printf_cat (&argv, "-net %s %s %s",
+ network,
+ gateway,
+ netmask);
+
+ argv_msg (D_ROUTE, &argv);
+ status = openvpn_execve_check (&argv, es, 0, "ERROR: DragonFly route add command failed");
+
+#elif defined(TARGET_DARWIN)
+
+ argv_printf (&argv, "%s add",
+ ROUTE_PATH);
+
+#if 0
+ if (r->metric_defined)
+ argv_printf_cat (&argv, "-rtt %d", r->metric);
+#endif
+
+ argv_printf_cat (&argv, "-net %s %s %s",
+ network,
+ gateway,
+ netmask);
+
+ argv_msg (D_ROUTE, &argv);
+ status = openvpn_execve_check (&argv, es, 0, "ERROR: OS X route add command failed");
+
+#elif defined(TARGET_OPENBSD) || defined(TARGET_NETBSD)
+
+ argv_printf (&argv, "%s add",
+ ROUTE_PATH);
+
+#if 0
+ if (r->metric_defined)
+ argv_printf_cat (&argv, "-rtt %d", r->metric);
+#endif
+
+ argv_printf_cat (&argv, "-net %s %s -netmask %s",
+ network,
+ gateway,
+ netmask);
+
+ argv_msg (D_ROUTE, &argv);
+ status = openvpn_execve_check (&argv, es, 0, "ERROR: OpenBSD/NetBSD route add command failed");
+
+#else
+ msg (M_FATAL, "Sorry, but I don't know how to do 'route' commands on this operating system. Try putting your routes in a --route-up script");
+#endif
+
+ done:
+ r->defined = status;
+ argv_reset (&argv);
+ gc_free (&gc);
+}
+
+static void
+delete_route (const struct route *r, const struct tuntap *tt, unsigned int flags, const struct env_set *es)
+{
+ struct gc_arena gc;
+ struct argv argv;
+ const char *network;
+ const char *netmask;
+ const char *gateway;
+
+ if (!r->defined)
+ return;
+
+ gc_init (&gc);
+ argv_init (&argv);
+
+ network = print_in_addr_t (r->network, 0, &gc);
+ netmask = print_in_addr_t (r->netmask, 0, &gc);
+ gateway = print_in_addr_t (r->gateway, 0, &gc);
+
+#if defined(TARGET_LINUX)
+#ifdef CONFIG_FEATURE_IPROUTE
+ argv_printf (&argv, "%s route del %s/%d",
+ iproute_path,
+ network,
+ count_netmask_bits(netmask));
+#else
+
+ argv_printf (&argv, "%s del -net %s netmask %s",
+ ROUTE_PATH,
+ network,
+ netmask);
+#endif /*CONFIG_FEATURE_IPROUTE*/
+ if (r->metric_defined)
+ argv_printf_cat (&argv, "metric %d", r->metric);
+ argv_msg (D_ROUTE, &argv);
+ openvpn_execve_check (&argv, es, 0, "ERROR: Linux route delete command failed");
+
+#elif defined (WIN32)
+
+ argv_printf (&argv, "%s%sc DELETE %s MASK %s %s",
+ get_win_sys_path(),
+ WIN_ROUTE_PATH_SUFFIX,
+ network,
+ netmask,
+ gateway);
+
+ argv_msg (D_ROUTE, &argv);
+
+ if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_IPAPI)
+ {
+ const bool status = del_route_ipapi (r, tt);
+ msg (D_ROUTE, "Route deletion via IPAPI %s", status ? "succeeded" : "failed");
+ }
+ else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_EXE)
+ {
+ netcmd_semaphore_lock ();
+ openvpn_execve_check (&argv, es, 0, "ERROR: Windows route delete command failed");
+ netcmd_semaphore_release ();
+ }
+ else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_ADAPTIVE)
+ {
+ const bool status = del_route_ipapi (r, tt);
+ msg (D_ROUTE, "Route deletion via IPAPI %s [adaptive]", status ? "succeeded" : "failed");
+ if (!status)
+ {
+ msg (D_ROUTE, "Route deletion fallback to route.exe");
+ netcmd_semaphore_lock ();
+ openvpn_execve_check (&argv, es, 0, "ERROR: Windows route delete command failed [adaptive]");
+ netcmd_semaphore_release ();
+ }
+ }
+ else
+ {
+ ASSERT (0);
+ }
+
+#elif defined (TARGET_SOLARIS)
+
+ argv_printf (&argv, "%s delete %s -netmask %s %s",
+ ROUTE_PATH,
+ network,
+ netmask,
+ gateway);
+
+ argv_msg (D_ROUTE, &argv);
+ openvpn_execve_check (&argv, es, 0, "ERROR: Solaris route delete command failed");
+
+#elif defined(TARGET_FREEBSD)
+
+ argv_printf (&argv, "%s delete -net %s %s %s",
+ ROUTE_PATH,
+ network,
+ gateway,
+ netmask);
+
+ argv_msg (D_ROUTE, &argv);
+ openvpn_execve_check (&argv, es, 0, "ERROR: FreeBSD route delete command failed");
+
+#elif defined(TARGET_DRAGONFLY)
+
+ argv_printf (&argv, "%s delete -net %s %s %s",
+ ROUTE_PATH,
+ network,
+ gateway,
+ netmask);
+
+ argv_msg (D_ROUTE, &argv);
+ openvpn_execve_check (&argv, es, 0, "ERROR: DragonFly route delete command failed");
+
+#elif defined(TARGET_DARWIN)
+
+ argv_printf (&argv, "%s delete -net %s %s %s",
+ ROUTE_PATH,
+ network,
+ gateway,
+ netmask);
+
+ argv_msg (D_ROUTE, &argv);
+ openvpn_execve_check (&argv, es, 0, "ERROR: OS X route delete command failed");
+
+#elif defined(TARGET_OPENBSD) || defined(TARGET_NETBSD)
+
+ argv_printf (&argv, "%s delete -net %s %s -netmask %s",
+ ROUTE_PATH,
+ network,
+ gateway,
+ netmask);
+
+ argv_msg (D_ROUTE, &argv);
+ openvpn_execve_check (&argv, es, 0, "ERROR: OpenBSD/NetBSD route delete command failed");
+
+#else
+ msg (M_FATAL, "Sorry, but I don't know how to do 'route' commands on this operating system. Try putting your routes in a --route-up script");
+#endif
+
+ argv_reset (&argv);
+ gc_free (&gc);
+}
+
+/*
+ * The --redirect-gateway option requires OS-specific code below
+ * to get the current default gateway.
+ */
+
+#if defined(WIN32)
+
+static const MIB_IPFORWARDTABLE *
+get_windows_routing_table (struct gc_arena *gc)
+{
+ ULONG size = 0;
+ PMIB_IPFORWARDTABLE rt = NULL;
+ DWORD status;
+
+ status = GetIpForwardTable (NULL, &size, TRUE);
+ if (status == ERROR_INSUFFICIENT_BUFFER)
+ {
+ rt = (PMIB_IPFORWARDTABLE) gc_malloc (size, false, gc);
+ status = GetIpForwardTable (rt, &size, TRUE);
+ if (status != NO_ERROR)
+ {
+ msg (D_ROUTE, "NOTE: GetIpForwardTable returned error: %s (code=%u)",
+ strerror_win32 (status, gc),
+ (unsigned int)status);
+ rt = NULL;
+ }
+ }
+ return rt;
+}
+
+static int
+test_route (const IP_ADAPTER_INFO *adapters,
+ const in_addr_t gateway,
+ DWORD *index)
+{
+ int count = 0;
+ DWORD i = adapter_index_of_ip (adapters, gateway, &count, NULL);
+ if (index)
+ *index = i;
+ return count;
+}
+
+static void
+test_route_helper (bool *ret,
+ int *count,
+ int *good,
+ int *ambig,
+ const IP_ADAPTER_INFO *adapters,
+ const in_addr_t gateway)
+{
+ int c;
+
+ ++*count;
+ c = test_route (adapters, gateway, NULL);
+ if (c == 0)
+ *ret = false;
+ else
+ ++*good;
+ if (c > 1)
+ ++*ambig;
+}
+
+/*
+ * If we tried to add routes now, would we succeed?
+ */
+bool
+test_routes (const struct route_list *rl, const struct tuntap *tt)
+{
+ struct gc_arena gc = gc_new ();
+ const IP_ADAPTER_INFO *adapters = get_adapter_info_list (&gc);
+ bool ret = false;
+ int count = 0;
+ int good = 0;
+ int ambig = 0;
+ bool adapter_up = false;
+
+ if (is_adapter_up (tt, adapters))
+ {
+ ret = true;
+ adapter_up = true;
+
+ if (rl)
+ {
+ int i;
+ for (i = 0; i < rl->n; ++i)
+ test_route_helper (&ret, &count, &good, &ambig, adapters, rl->routes[i].gateway);
+
+ if ((rl->flags & RG_ENABLE) && rl->spec.remote_endpoint_defined)
+ test_route_helper (&ret, &count, &good, &ambig, adapters, rl->spec.remote_endpoint);
+ }
+ }
+
+ msg (D_ROUTE, "TEST ROUTES: %d/%d succeeded len=%d ret=%d a=%d u/d=%s",
+ good,
+ count,
+ rl ? rl->n : -1,
+ (int)ret,
+ ambig,
+ adapter_up ? "up" : "down");
+
+ gc_free (&gc);
+ return ret;
+}
+
+static const MIB_IPFORWARDROW *
+get_default_gateway_row (const MIB_IPFORWARDTABLE *routes)
+{
+ struct gc_arena gc = gc_new ();
+ DWORD lowest_metric = ~0;
+ const MIB_IPFORWARDROW *ret = NULL;
+ int i;
+ int best = -1;
+
+ if (routes)
+ {
+ for (i = 0; i < routes->dwNumEntries; ++i)
+ {
+ const MIB_IPFORWARDROW *row = &routes->table[i];
+ const in_addr_t net = ntohl (row->dwForwardDest);
+ const in_addr_t mask = ntohl (row->dwForwardMask);
+ const DWORD index = row->dwForwardIfIndex;
+ const DWORD metric = row->dwForwardMetric1;
+
+ dmsg (D_ROUTE_DEBUG, "GDGR: route[%d] %s/%s i=%d m=%d",
+ i,
+ print_in_addr_t ((in_addr_t) net, 0, &gc),
+ print_in_addr_t ((in_addr_t) mask, 0, &gc),
+ (int)index,
+ (int)metric);
+
+ if (!net && !mask && metric < lowest_metric)
+ {
+ ret = row;
+ lowest_metric = metric;
+ best = i;
+ }
+ }
+ }
+
+ dmsg (D_ROUTE_DEBUG, "GDGR: best=%d lm=%u", best, (unsigned int)lowest_metric);
+
+ gc_free (&gc);
+ return ret;
+}
+
+bool
+get_default_gateway (in_addr_t *gw, in_addr_t *netmask)
+{
+ struct gc_arena gc = gc_new ();
+ bool ret_bool = false;
+
+ const IP_ADAPTER_INFO *adapters = get_adapter_info_list (&gc);
+ const MIB_IPFORWARDTABLE *routes = get_windows_routing_table (&gc);
+ const MIB_IPFORWARDROW *row = get_default_gateway_row (routes);
+
+ if (row)
+ {
+ *gw = ntohl (row->dwForwardNextHop);
+ if (netmask)
+ {
+ if (adapter_index_of_ip (adapters, *gw, NULL, netmask) == ~0)
+ *netmask = ~0;
+ }
+ ret_bool = true;
+ }
+
+ gc_free (&gc);
+ return ret_bool;
+}
+
+static DWORD
+windows_route_find_if_index (const struct route *r, const struct tuntap *tt)
+{
+ struct gc_arena gc = gc_new ();
+ DWORD ret = ~0;
+ int count = 0;
+ const IP_ADAPTER_INFO *adapters = get_adapter_info_list (&gc);
+ const IP_ADAPTER_INFO *tun_adapter = get_tun_adapter (tt, adapters);
+ bool on_tun = false;
+
+ /* first test on tun interface */
+ if (is_ip_in_adapter_subnet (tun_adapter, r->gateway, NULL))
+ {
+ ret = tun_adapter->Index;
+ count = 1;
+ on_tun = true;
+ }
+ else /* test on other interfaces */
+ {
+ count = test_route (adapters, r->gateway, &ret);
+ }
+
+ if (count == 0)
+ {
+ msg (M_WARN, "Warning: route gateway is not reachable on any active network adapters: %s",
+ print_in_addr_t (r->gateway, 0, &gc));
+ ret = ~0;
+ }
+ else if (count > 1)
+ {
+ msg (M_WARN, "Warning: route gateway is ambiguous: %s (%d matches)",
+ print_in_addr_t (r->gateway, 0, &gc),
+ count);
+ ret = ~0;
+ }
+
+ dmsg (D_ROUTE_DEBUG, "DEBUG: route find if: on_tun=%d count=%d index=%d",
+ on_tun,
+ count,
+ (int)ret);
+
+ gc_free (&gc);
+ return ret;
+}
+
+bool
+add_route_ipapi (const struct route *r, const struct tuntap *tt)
+{
+ struct gc_arena gc = gc_new ();
+ bool ret = false;
+ DWORD status;
+ const DWORD if_index = windows_route_find_if_index (r, tt);
+
+ if (if_index != ~0)
+ {
+ MIB_IPFORWARDROW fr;
+ CLEAR (fr);
+ fr.dwForwardDest = htonl (r->network);
+ fr.dwForwardMask = htonl (r->netmask);
+ fr.dwForwardPolicy = 0;
+ fr.dwForwardNextHop = htonl (r->gateway);
+ fr.dwForwardIfIndex = if_index;
+ fr.dwForwardType = 4; /* the next hop is not the final dest */
+ fr.dwForwardProto = 3; /* PROTO_IP_NETMGMT */
+ fr.dwForwardAge = 0;
+ fr.dwForwardNextHopAS = 0;
+ fr.dwForwardMetric1 = r->metric_defined ? r->metric : 1;
+ fr.dwForwardMetric2 = ~0;
+ fr.dwForwardMetric3 = ~0;
+ fr.dwForwardMetric4 = ~0;
+ fr.dwForwardMetric5 = ~0;
+
+ if ((r->network & r->netmask) != r->network)
+ msg (M_WARN, "Warning: address %s is not a network address in relation to netmask %s",
+ print_in_addr_t (r->network, 0, &gc),
+ print_in_addr_t (r->netmask, 0, &gc));
+
+ status = CreateIpForwardEntry (&fr);
+
+ if (status == NO_ERROR)
+ ret = true;
+ else
+ {
+ /* failed, try increasing the metric to work around Vista issue */
+ const unsigned int forward_metric_limit = 2048; /* iteratively retry higher metrics up to this limit */
+
+ for ( ; fr.dwForwardMetric1 <= forward_metric_limit; ++fr.dwForwardMetric1)
+ {
+ /* try a different forward type=3 ("the next hop is the final dest") in addition to 4.
+ --redirect-gateway over RRAS seems to need this. */
+ for (fr.dwForwardType = 4; fr.dwForwardType >= 3; --fr.dwForwardType)
+ {
+ status = CreateIpForwardEntry (&fr);
+ if (status == NO_ERROR)
+ {
+ msg (D_ROUTE, "ROUTE: CreateIpForwardEntry succeeded with dwForwardMetric1=%u and dwForwardType=%u",
+ (unsigned int)fr.dwForwardMetric1,
+ (unsigned int)fr.dwForwardType);
+ ret = true;
+ goto doublebreak;
+ }
+ else if (status != ERROR_BAD_ARGUMENTS)
+ goto doublebreak;
+ }
+ }
+
+ doublebreak:
+ if (status != NO_ERROR)
+ msg (M_WARN, "ROUTE: route addition failed using CreateIpForwardEntry: %s [status=%u if_index=%u]",
+ strerror_win32 (status, &gc),
+ (unsigned int)status,
+ (unsigned int)if_index);
+ }
+ }
+
+ gc_free (&gc);
+ return ret;
+}
+
+bool
+del_route_ipapi (const struct route *r, const struct tuntap *tt)
+{
+ struct gc_arena gc = gc_new ();
+ bool ret = false;
+ DWORD status;
+ const DWORD if_index = windows_route_find_if_index (r, tt);
+
+ if (if_index != ~0)
+ {
+ MIB_IPFORWARDROW fr;
+ CLEAR (fr);
+
+ fr.dwForwardDest = htonl (r->network);
+ fr.dwForwardMask = htonl (r->netmask);
+ fr.dwForwardPolicy = 0;
+ fr.dwForwardNextHop = htonl (r->gateway);
+ fr.dwForwardIfIndex = if_index;
+
+ status = DeleteIpForwardEntry (&fr);
+
+ if (status == NO_ERROR)
+ ret = true;
+ else
+ msg (M_WARN, "ROUTE: route deletion failed using DeleteIpForwardEntry: %s",
+ strerror_win32 (status, &gc));
+ }
+
+ gc_free (&gc);
+ return ret;
+}
+
+static const char *
+format_route_entry (const MIB_IPFORWARDROW *r, struct gc_arena *gc)
+{
+ struct buffer out = alloc_buf_gc (256, gc);
+ buf_printf (&out, "%s %s %s p=%d i=%d t=%d pr=%d a=%d h=%d m=%d/%d/%d/%d/%d",
+ print_in_addr_t (r->dwForwardDest, IA_NET_ORDER, gc),
+ print_in_addr_t (r->dwForwardMask, IA_NET_ORDER, gc),
+ print_in_addr_t (r->dwForwardNextHop, IA_NET_ORDER, gc),
+ (int)r->dwForwardPolicy,
+ (int)r->dwForwardIfIndex,
+ (int)r->dwForwardType,
+ (int)r->dwForwardProto,
+ (int)r->dwForwardAge,
+ (int)r->dwForwardNextHopAS,
+ (int)r->dwForwardMetric1,
+ (int)r->dwForwardMetric2,
+ (int)r->dwForwardMetric3,
+ (int)r->dwForwardMetric4,
+ (int)r->dwForwardMetric5);
+ return BSTR (&out);
+}
+
+/*
+ * Show current routing table
+ */
+void
+show_routes (int msglev)
+{
+ struct gc_arena gc = gc_new ();
+ int i;
+
+ const MIB_IPFORWARDTABLE *rt = get_windows_routing_table (&gc);
+
+ msg (msglev, "SYSTEM ROUTING TABLE");
+ if (rt)
+ {
+ for (i = 0; i < rt->dwNumEntries; ++i)
+ {
+ msg (msglev, "%s", format_route_entry (&rt->table[i], &gc));
+ }
+ }
+ gc_free (&gc);
+}
+
+#elif defined(TARGET_LINUX)
+
+bool
+get_default_gateway (in_addr_t *gateway, in_addr_t *netmask)
+{
+ struct gc_arena gc = gc_new ();
+ bool ret = false;
+ FILE *fp = fopen ("/proc/net/route", "r");
+ if (fp)
+ {
+ char line[256];
+ int count = 0;
+ int best_count = 0;
+ unsigned int lowest_metric = ~0;
+ in_addr_t best_gw = 0;
+ while (fgets (line, sizeof (line), fp) != NULL)
+ {
+ if (count)
+ {
+ unsigned int net_x = 0;
+ unsigned int mask_x = 0;
+ unsigned int gw_x = 0;
+ unsigned int metric = 0;
+ const int np = sscanf (line, "%*s\t%x\t%x\t%*s\t%*s\t%*s\t%d\t%x",
+ &net_x,
+ &gw_x,
+ &metric,
+ &mask_x);
+ if (np == 4)
+ {
+ const in_addr_t net = ntohl (net_x);
+ const in_addr_t mask = ntohl (mask_x);
+ const in_addr_t gw = ntohl (gw_x);
+
+ dmsg (D_ROUTE_DEBUG, "GDG: route[%d] %s/%s/%s m=%u",
+ count,
+ print_in_addr_t ((in_addr_t) net, 0, &gc),
+ print_in_addr_t ((in_addr_t) mask, 0, &gc),
+ print_in_addr_t ((in_addr_t) gw, 0, &gc),
+ metric);
+
+ if (!net && !mask && metric < lowest_metric)
+ {
+ best_gw = gw;
+ lowest_metric = metric;
+ best_count = count;
+ }
+ }
+ }
+ ++count;
+ }
+ fclose (fp);
+
+ if (best_gw)
+ {
+ *gateway = best_gw;
+ if (netmask)
+ {
+ *netmask = 0xFFFFFF00; /* FIXME -- get the real netmask of the adapter containing the default gateway */
+ }
+ ret = true;
+ }
+
+ dmsg (D_ROUTE_DEBUG, "GDG: best=%s[%d] lm=%u",
+ print_in_addr_t ((in_addr_t) best_gw, 0, &gc),
+ best_count,
+ (unsigned int)lowest_metric);
+ }
+
+ gc_free (&gc);
+ return ret;
+}
+
+#elif defined(TARGET_FREEBSD)||defined(TARGET_DRAGONFLY)
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+/* all of this is taken from <net/route.h> in FreeBSD */
+#define RTA_DST 0x1
+#define RTA_GATEWAY 0x2
+#define RTA_NETMASK 0x4
+
+#define RTM_GET 0x4
+#define RTM_VERSION 5
+
+#define RTF_UP 0x1
+#define RTF_GATEWAY 0x2
+
+/*
+ * These numbers are used by reliable protocols for determining
+ * retransmission behavior and are included in the routing structure.
+ */
+struct rt_metrics {
+ u_long rmx_locks; /* Kernel must leave these values alone */
+ u_long rmx_mtu; /* MTU for this path */
+ u_long rmx_hopcount; /* max hops expected */
+ u_long rmx_expire; /* lifetime for route, e.g. redirect */
+ u_long rmx_recvpipe; /* inbound delay-bandwidth product */
+ u_long rmx_sendpipe; /* outbound delay-bandwidth product */
+ u_long rmx_ssthresh; /* outbound gateway buffer limit */
+ u_long rmx_rtt; /* estimated round trip time */
+ u_long rmx_rttvar; /* estimated rtt variance */
+ u_long rmx_pksent; /* packets sent using this route */
+ u_long rmx_filler[4]; /* will be used for T/TCP later */
+};
+
+/*
+ * Structures for routing messages.
+ */
+struct rt_msghdr {
+ u_short rtm_msglen; /* to skip over non-understood messages */
+ u_char rtm_version; /* future binary compatibility */
+ u_char rtm_type; /* message type */
+ u_short rtm_index; /* index for associated ifp */
+ int rtm_flags; /* flags, incl. kern & message, e.g. DONE */
+ int rtm_addrs; /* bitmask identifying sockaddrs in msg */
+ pid_t rtm_pid; /* identify sender */
+ int rtm_seq; /* for sender to identify action */
+ int rtm_errno; /* why failed */
+ int rtm_use; /* from rtentry */
+ u_long rtm_inits; /* which metrics we are initializing */
+ struct rt_metrics rtm_rmx; /* metrics themselves */
+};
+
+struct {
+ struct rt_msghdr m_rtm;
+ char m_space[512];
+} m_rtmsg;
+
+#define ROUNDUP(a) \
+ ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
+
+bool
+get_default_gateway (in_addr_t *ret, in_addr_t *netmask)
+{
+ struct gc_arena gc = gc_new ();
+ int s, seq, l, pid, rtm_addrs, i;
+ struct sockaddr so_dst, so_mask;
+ char *cp = m_rtmsg.m_space;
+ struct sockaddr *gate = NULL, *sa;
+ struct rt_msghdr *rtm_aux;
+
+#define NEXTADDR(w, u) \
+ if (rtm_addrs & (w)) {\
+ l = ROUNDUP(u.sa_len); memmove(cp, &(u), l); cp += l;\
+ }
+
+#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
+
+#define rtm m_rtmsg.m_rtm
+
+ pid = getpid();
+ seq = 0;
+ rtm_addrs = RTA_DST | RTA_NETMASK;
+
+ bzero(&so_dst, sizeof(so_dst));
+ bzero(&so_mask, sizeof(so_mask));
+ bzero(&rtm, sizeof(struct rt_msghdr));
+
+ rtm.rtm_type = RTM_GET;
+ rtm.rtm_flags = RTF_UP | RTF_GATEWAY;
+ rtm.rtm_version = RTM_VERSION;
+ rtm.rtm_seq = ++seq;
+ rtm.rtm_addrs = rtm_addrs;
+
+ so_dst.sa_family = AF_INET;
+ so_dst.sa_len = sizeof(struct sockaddr_in);
+ so_mask.sa_family = AF_INET;
+ so_mask.sa_len = sizeof(struct sockaddr_in);
+
+ NEXTADDR(RTA_DST, so_dst);
+ NEXTADDR(RTA_NETMASK, so_mask);
+
+ rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
+
+ s = socket(PF_ROUTE, SOCK_RAW, 0);
+
+ if (write(s, (char *)&m_rtmsg, l) < 0)
+ {
+ warn("writing to routing socket");
+ gc_free (&gc);
+ close(s);
+ return false;
+ }
+
+ do {
+ l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
+ } while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
+
+ close(s);
+
+ rtm_aux = &rtm;
+
+ cp = ((char *)(rtm_aux + 1));
+ if (rtm_aux->rtm_addrs) {
+ for (i = 1; i; i <<= 1)
+ if (i & rtm_aux->rtm_addrs) {
+ sa = (struct sockaddr *)cp;
+ if (i == RTA_GATEWAY )
+ gate = sa;
+ ADVANCE(cp, sa);
+ }
+ }
+ else
+ {
+ gc_free (&gc);
+ return false;
+ }
+
+
+ if (gate != NULL )
+ {
+ *ret = ntohl(((struct sockaddr_in *)gate)->sin_addr.s_addr);
+#if 0
+ msg (M_INFO, "gw %s",
+ print_in_addr_t ((in_addr_t) *ret, 0, &gc));
+#endif
+
+ if (netmask)
+ {
+ *netmask = 0xFFFFFF00; // FIXME -- get the real netmask of the adapter containing the default gateway
+ }
+
+ gc_free (&gc);
+ return true;
+ }
+ else
+ {
+ gc_free (&gc);
+ return false;
+ }
+}
+
+#elif defined(TARGET_DARWIN)
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+/* all of this is taken from <net/route.h> in Darwin */
+#define RTA_DST 0x1
+#define RTA_GATEWAY 0x2
+#define RTA_NETMASK 0x4
+
+#define RTM_GET 0x4
+#define RTM_VERSION 5
+
+#define RTF_UP 0x1
+#define RTF_GATEWAY 0x2
+
+/*
+ * These numbers are used by reliable protocols for determining
+ * retransmission behavior and are included in the routing structure.
+ */
+struct rt_metrics {
+ u_long rmx_locks; /* Kernel must leave these values alone */
+ u_long rmx_mtu; /* MTU for this path */
+ u_long rmx_hopcount; /* max hops expected */
+ u_long rmx_expire; /* lifetime for route, e.g. redirect */
+ u_long rmx_recvpipe; /* inbound delay-bandwidth product */
+ u_long rmx_sendpipe; /* outbound delay-bandwidth product */
+ u_long rmx_ssthresh; /* outbound gateway buffer limit */
+ u_long rmx_rtt; /* estimated round trip time */
+ u_long rmx_rttvar; /* estimated rtt variance */
+ u_long rmx_pksent; /* packets sent using this route */
+ u_long rmx_filler[4]; /* will be used for T/TCP later */
+};
+
+/*
+ * Structures for routing messages.
+ */
+struct rt_msghdr {
+ u_short rtm_msglen; /* to skip over non-understood messages */
+ u_char rtm_version; /* future binary compatibility */
+ u_char rtm_type; /* message type */
+ u_short rtm_index; /* index for associated ifp */
+ int rtm_flags; /* flags, incl. kern & message, e.g. DONE */
+ int rtm_addrs; /* bitmask identifying sockaddrs in msg */
+ pid_t rtm_pid; /* identify sender */
+ int rtm_seq; /* for sender to identify action */
+ int rtm_errno; /* why failed */
+ int rtm_use; /* from rtentry */
+ u_long rtm_inits; /* which metrics we are initializing */
+ struct rt_metrics rtm_rmx; /* metrics themselves */
+};
+
+struct {
+ struct rt_msghdr m_rtm;
+ char m_space[512];
+} m_rtmsg;
+
+#define ROUNDUP(a) \
+ ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
+
+bool
+get_default_gateway (in_addr_t *ret, in_addr_t *netmask)
+{
+ struct gc_arena gc = gc_new ();
+ int s, seq, l, pid, rtm_addrs, i;
+ struct sockaddr so_dst, so_mask;
+ char *cp = m_rtmsg.m_space;
+ struct sockaddr *gate = NULL, *sa;
+ struct rt_msghdr *rtm_aux;
+
+#define NEXTADDR(w, u) \
+ if (rtm_addrs & (w)) {\
+ l = ROUNDUP(u.sa_len); memmove(cp, &(u), l); cp += l;\
+ }
+
+#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
+
+#define rtm m_rtmsg.m_rtm
+
+ pid = getpid();
+ seq = 0;
+ rtm_addrs = RTA_DST | RTA_NETMASK;
+
+ bzero(&so_dst, sizeof(so_dst));
+ bzero(&so_mask, sizeof(so_mask));
+ bzero(&rtm, sizeof(struct rt_msghdr));
+
+ rtm.rtm_type = RTM_GET;
+ rtm.rtm_flags = RTF_UP | RTF_GATEWAY;
+ rtm.rtm_version = RTM_VERSION;
+ rtm.rtm_seq = ++seq;
+ rtm.rtm_addrs = rtm_addrs;
+
+ so_dst.sa_family = AF_INET;
+ so_dst.sa_len = sizeof(struct sockaddr_in);
+ so_mask.sa_family = AF_INET;
+ so_mask.sa_len = sizeof(struct sockaddr_in);
+
+ NEXTADDR(RTA_DST, so_dst);
+ NEXTADDR(RTA_NETMASK, so_mask);
+
+ rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
+
+ s = socket(PF_ROUTE, SOCK_RAW, 0);
+
+ if (write(s, (char *)&m_rtmsg, l) < 0)
+ {
+ msg (M_WARN, "ROUTE: problem writing to routing socket");
+ gc_free (&gc);
+ close(s);
+ return false;
+ }
+
+ do {
+ l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
+ } while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
+
+ close(s);
+
+ rtm_aux = &rtm;
+
+ cp = ((char *)(rtm_aux + 1));
+ if (rtm_aux->rtm_addrs) {
+ for (i = 1; i; i <<= 1)
+ if (i & rtm_aux->rtm_addrs) {
+ sa = (struct sockaddr *)cp;
+ if (i == RTA_GATEWAY )
+ gate = sa;
+ ADVANCE(cp, sa);
+ }
+ }
+ else
+ {
+ gc_free (&gc);
+ return false;
+ }
+
+
+ if (gate != NULL )
+ {
+ *ret = ntohl(((struct sockaddr_in *)gate)->sin_addr.s_addr);
+#if 0
+ msg (M_INFO, "gw %s",
+ print_in_addr_t ((in_addr_t) *ret, 0, &gc));
+#endif
+
+ if (netmask)
+ {
+ *netmask = 0xFFFFFF00; // FIXME -- get the real netmask of the adapter containing the default gateway
+ }
+
+ gc_free (&gc);
+ return true;
+ }
+ else
+ {
+ gc_free (&gc);
+ return false;
+ }
+}
+
+#elif defined(TARGET_OPENBSD) || defined(TARGET_NETBSD)
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+/* all of this is taken from <net/route.h> in OpenBSD 3.6 */
+#define RTA_DST 0x1 /* destination sockaddr present */
+#define RTA_GATEWAY 0x2 /* gateway sockaddr present */
+#define RTA_NETMASK 0x4 /* netmask sockaddr present */
+
+#define RTM_GET 0x4 /* Report Metrics */
+
+#define RTM_VERSION 3 /* Up the ante and ignore older versions */
+
+#define RTF_UP 0x1 /* route usable */
+#define RTF_GATEWAY 0x2 /* destination is a gateway */
+
+/*
+ * Huge version for userland compatibility.
+ */
+struct rt_metrics {
+ u_long rmx_locks; /* Kernel must leave these values alone */
+ u_long rmx_mtu; /* MTU for this path */
+ u_long rmx_hopcount; /* max hops expected */
+ u_long rmx_expire; /* lifetime for route, e.g. redirect */
+ u_long rmx_recvpipe; /* inbound delay-bandwidth product */
+ u_long rmx_sendpipe; /* outbound delay-bandwidth product */
+ u_long rmx_ssthresh; /* outbound gateway buffer limit */
+ u_long rmx_rtt; /* estimated round trip time */
+ u_long rmx_rttvar; /* estimated rtt variance */
+ u_long rmx_pksent; /* packets sent using this route */
+};
+
+/*
+ * Structures for routing messages.
+ */
+struct rt_msghdr {
+ u_short rtm_msglen; /* to skip over non-understood messages */
+ u_char rtm_version; /* future binary compatibility */
+ u_char rtm_type; /* message type */
+ u_short rtm_index; /* index for associated ifp */
+ int rtm_flags; /* flags, incl. kern & message, e.g. DONE */
+ int rtm_addrs; /* bitmask identifying sockaddrs in msg */
+ pid_t rtm_pid; /* identify sender */
+ int rtm_seq; /* for sender to identify action */
+ int rtm_errno; /* why failed */
+ int rtm_use; /* from rtentry */
+ u_long rtm_inits; /* which metrics we are initializing */
+ struct rt_metrics rtm_rmx; /* metrics themselves */
+};
+
+struct {
+ struct rt_msghdr m_rtm;
+ char m_space[512];
+} m_rtmsg;
+
+#define ROUNDUP(a) \
+ ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
+
+bool
+get_default_gateway (in_addr_t *ret, in_addr_t *netmask)
+{
+ struct gc_arena gc = gc_new ();
+ int s, seq, l, rtm_addrs, i;
+ pid_t pid;
+ struct sockaddr so_dst, so_mask;
+ char *cp = m_rtmsg.m_space;
+ struct sockaddr *gate = NULL, *sa;
+ struct rt_msghdr *rtm_aux;
+
+#define NEXTADDR(w, u) \
+ if (rtm_addrs & (w)) {\
+ l = ROUNDUP(u.sa_len); memmove(cp, &(u), l); cp += l;\
+ }
+
+#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
+
+#define rtm m_rtmsg.m_rtm
+
+ pid = getpid();
+ seq = 0;
+ rtm_addrs = RTA_DST | RTA_NETMASK;
+
+ bzero(&so_dst, sizeof(so_dst));
+ bzero(&so_mask, sizeof(so_mask));
+ bzero(&rtm, sizeof(struct rt_msghdr));
+
+ rtm.rtm_type = RTM_GET;
+ rtm.rtm_flags = RTF_UP | RTF_GATEWAY;
+ rtm.rtm_version = RTM_VERSION;
+ rtm.rtm_seq = ++seq;
+ rtm.rtm_addrs = rtm_addrs;
+
+ so_dst.sa_family = AF_INET;
+ so_dst.sa_len = sizeof(struct sockaddr_in);
+ so_mask.sa_family = AF_INET;
+ so_mask.sa_len = sizeof(struct sockaddr_in);
+
+ NEXTADDR(RTA_DST, so_dst);
+ NEXTADDR(RTA_NETMASK, so_mask);
+
+ rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
+
+ s = socket(PF_ROUTE, SOCK_RAW, 0);
+
+ if (write(s, (char *)&m_rtmsg, l) < 0)
+ {
+ warn("writing to routing socket");
+ gc_free (&gc);
+ close(s);
+ return false;
+ }
+
+ do {
+ l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
+ } while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
+
+ close(s);
+
+ rtm_aux = &rtm;
+
+ cp = ((char *)(rtm_aux + 1));
+ if (rtm_aux->rtm_addrs) {
+ for (i = 1; i; i <<= 1)
+ if (i & rtm_aux->rtm_addrs) {
+ sa = (struct sockaddr *)cp;
+ if (i == RTA_GATEWAY )
+ gate = sa;
+ ADVANCE(cp, sa);
+ }
+ }
+ else
+ {
+ gc_free (&gc);
+ return false;
+ }
+
+
+ if (gate != NULL )
+ {
+ *ret = ntohl(((struct sockaddr_in *)gate)->sin_addr.s_addr);
+#if 0
+ msg (M_INFO, "gw %s",
+ print_in_addr_t ((in_addr_t) *ret, 0, &gc));
+#endif
+
+ if (netmask)
+ {
+ *netmask = 0xFFFFFF00; // FIXME -- get the real netmask of the adapter containing the default gateway
+ }
+
+ gc_free (&gc);
+ return true;
+ }
+ else
+ {
+ gc_free (&gc);
+ return false;
+ }
+}
+
+#else
+
+bool
+get_default_gateway (in_addr_t *ret, in_addr_t *netmask) /* PLATFORM-SPECIFIC */
+{
+ return false;
+}
+
+#endif
+
+bool
+netmask_to_netbits (const in_addr_t network, const in_addr_t netmask, int *netbits)
+{
+ int i;
+ const int addrlen = sizeof (in_addr_t) * 8;
+
+ if ((network & netmask) == network)
+ {
+ for (i = 0; i <= addrlen; ++i)
+ {
+ in_addr_t mask = netbits_to_netmask (i);
+ if (mask == netmask)
+ {
+ if (i == addrlen)
+ *netbits = -1;
+ else
+ *netbits = i;
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+/*
+ * get_bypass_addresses() is used by the redirect-gateway bypass-x
+ * functions to build a route bypass to selected DHCP/DNS servers,
+ * so that outgoing packets to these servers don't end up in the tunnel.
+ */
+
+#if defined(WIN32)
+
+static void
+add_host_route_if_nonlocal (struct route_bypass *rb, const in_addr_t addr)
+{
+ if (test_local_addr(addr) == TLA_NONLOCAL && addr != 0 && addr != ~0) {
+ int i;
+ for (i = 0; i < rb->n_bypass; ++i)
+ {
+ if (addr == rb->bypass[i]) /* avoid duplicates */
+ return;
+ }
+ if (rb->n_bypass < N_ROUTE_BYPASS)
+ {
+ rb->bypass[rb->n_bypass++] = addr;
+ }
+ }
+}
+
+static void
+add_host_route_array (struct route_bypass *rb, const IP_ADDR_STRING *iplist)
+{
+ while (iplist)
+ {
+ bool succeed = false;
+ const in_addr_t ip = getaddr (GETADDR_HOST_ORDER, iplist->IpAddress.String, 0, &succeed, NULL);
+ if (succeed)
+ {
+ add_host_route_if_nonlocal (rb, ip);
+ }
+ iplist = iplist->Next;
+ }
+}
+
+static void
+get_bypass_addresses (struct route_bypass *rb, const unsigned int flags)
+{
+ struct gc_arena gc = gc_new ();
+ /*bool ret_bool = false;*/
+
+ /* get full routing table */
+ const MIB_IPFORWARDTABLE *routes = get_windows_routing_table (&gc);
+
+ /* get the route which represents the default gateway */
+ const MIB_IPFORWARDROW *row = get_default_gateway_row (routes);
+
+ if (row)
+ {
+ /* get the adapter which the default gateway is associated with */
+ const IP_ADAPTER_INFO *dgi = get_adapter_info (row->dwForwardIfIndex, &gc);
+
+ /* get extra adapter info, such as DNS addresses */
+ const IP_PER_ADAPTER_INFO *pai = get_per_adapter_info (row->dwForwardIfIndex, &gc);
+
+ /* Bypass DHCP server address */
+ if ((flags & RG_BYPASS_DHCP) && dgi && dgi->DhcpEnabled)
+ add_host_route_array (rb, &dgi->DhcpServer);
+
+ /* Bypass DNS server addresses */
+ if ((flags & RG_BYPASS_DNS) && pai)
+ add_host_route_array (rb, &pai->DnsServerList);
+ }
+
+ gc_free (&gc);
+}
+
+#else
+
+static void
+get_bypass_addresses (struct route_bypass *rb, const unsigned int flags) /* PLATFORM-SPECIFIC */
+{
+}
+
+#endif
+
+#if AUTO_USERID || defined(ENABLE_PUSH_PEER_INFO)
+
+#if defined(TARGET_LINUX)
+
+bool
+get_default_gateway_mac_addr (unsigned char *macaddr)
+{
+ struct ifreq *ifr, *ifend;
+ in_addr_t ina, mask;
+ struct ifreq ifreq;
+ struct ifconf ifc;
+ struct ifreq ifs[20]; // Maximum number of interfaces to scan
+ int sd = -1;
+ in_addr_t gwip = 0;
+ bool ret = false;
+
+ if (!get_default_gateway (&gwip, NULL))
+ {
+ msg (M_WARN, "GDGMA: get_default_gateway failed");
+ goto err;
+ }
+
+ if ((sd = socket (AF_INET, SOCK_DGRAM, 0)) < 0)
+ {
+ msg (M_WARN, "GDGMA: socket() failed");
+ goto err;
+ }
+
+ ifc.ifc_len = sizeof (ifs);
+ ifc.ifc_req = ifs;
+ if (ioctl (sd, SIOCGIFCONF, &ifc) < 0)
+ {
+ msg (M_WARN, "GDGMA: ioctl(SIOCGIFCONF) failed");
+ goto err;
+ }
+
+ /* scan through interface list */
+ ifend = ifs + (ifc.ifc_len / sizeof (struct ifreq));
+ for (ifr = ifc.ifc_req; ifr < ifend; ifr++)
+ {
+ if (ifr->ifr_addr.sa_family == AF_INET)
+ {
+ ina = ntohl(((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr);
+ strncpynt (ifreq.ifr_name, ifr->ifr_name, sizeof (ifreq.ifr_name));
+
+ dmsg (D_AUTO_USERID, "GDGMA: %s", ifreq.ifr_name);
+
+ /* check that the interface is up, and not point-to-point or loopback */
+ if (ioctl (sd, SIOCGIFFLAGS, &ifreq) < 0)
+ {
+ dmsg (D_AUTO_USERID, "GDGMA: SIOCGIFFLAGS(%s) failed", ifreq.ifr_name);
+ continue;
+ }
+
+ if ((ifreq.ifr_flags & (IFF_UP|IFF_LOOPBACK)) != IFF_UP)
+ {
+ dmsg (D_AUTO_USERID, "GDGMA: interface %s is down or loopback", ifreq.ifr_name);
+ continue;
+ }
+
+ /* get interface netmask and check for correct subnet */
+ if (ioctl (sd, SIOCGIFNETMASK, &ifreq) < 0)
+ {
+ dmsg (D_AUTO_USERID, "GDGMA: SIOCGIFNETMASK(%s) failed", ifreq.ifr_name);
+ continue;
+ }
+
+ mask = ntohl(((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr);
+ if (((gwip ^ ina) & mask) != 0)
+ {
+ dmsg (D_AUTO_USERID, "GDGMA: gwip=0x%08x ina=0x%08x mask=0x%08x",
+ (unsigned int)gwip,
+ (unsigned int)ina,
+ (unsigned int)mask);
+ continue;
+ }
+ break;
+ }
+ }
+ if (ifr >= ifend)
+ {
+ msg (M_WARN, "GDGMA: couldn't find gw interface");
+ goto err;
+ }
+
+ /* now get the hardware address. */
+ memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
+ if (ioctl (sd, SIOCGIFHWADDR, &ifreq) < 0)
+ {
+ msg (M_WARN, "GDGMA: SIOCGIFHWADDR(%s) failed", ifreq.ifr_name);
+ goto err;
+ }
+
+ memcpy (macaddr, &ifreq.ifr_hwaddr.sa_data, 6);
+ ret = true;
+
+ err:
+ if (sd >= 0)
+ close (sd);
+ return ret;
+}
+
+#elif defined(WIN32)
+
+bool
+get_default_gateway_mac_addr (unsigned char *macaddr)
+{
+ struct gc_arena gc = gc_new ();
+ const IP_ADAPTER_INFO *adapters = get_adapter_info_list (&gc);
+ in_addr_t gwip = 0;
+ DWORD a_index;
+ const IP_ADAPTER_INFO *ai;
+
+ if (!get_default_gateway (&gwip, NULL))
+ {
+ msg (M_WARN, "GDGMA: get_default_gateway failed");
+ goto err;
+ }
+
+ a_index = adapter_index_of_ip (adapters, gwip, NULL, NULL);
+ ai = get_adapter (adapters, a_index);
+
+ if (!ai)
+ {
+ msg (M_WARN, "GDGMA: couldn't find gw interface");
+ goto err;
+ }
+
+ memcpy (macaddr, ai->Address, 6);
+
+ gc_free (&gc);
+ return true;
+
+ err:
+ gc_free (&gc);
+ return false;
+}
+
+#else
+
+bool
+get_default_gateway_mac_addr (unsigned char *macaddr) /* PLATFORM-SPECIFIC */
+{
+ return false;
+}
+
+#endif
+#endif /* AUTO_USERID */
+
+/*
+ * Test if addr is reachable via a local interface (return ILA_LOCAL),
+ * or if it needs to be routed via the default gateway (return
+ * ILA_NONLOCAL). If the target platform doesn't implement this
+ * function, return ILA_NOT_IMPLEMENTED.
+ *
+ * Used by redirect-gateway autolocal feature
+ */
+
+#if defined(WIN32)
+
+int
+test_local_addr (const in_addr_t addr)
+{
+ struct gc_arena gc = gc_new ();
+ const in_addr_t nonlocal_netmask = 0x80000000L; /* routes with netmask <= to this are considered non-local */
+ bool ret = TLA_NONLOCAL;
+
+ /* get full routing table */
+ const MIB_IPFORWARDTABLE *rt = get_windows_routing_table (&gc);
+ if (rt)
+ {
+ int i;
+ for (i = 0; i < rt->dwNumEntries; ++i)
+ {
+ const MIB_IPFORWARDROW *row = &rt->table[i];
+ const in_addr_t net = ntohl (row->dwForwardDest);
+ const in_addr_t mask = ntohl (row->dwForwardMask);
+ if (mask > nonlocal_netmask && (addr & mask) == net)
+ {
+ ret = TLA_LOCAL;
+ break;
+ }
+ }
+ }
+
+ gc_free (&gc);
+ return ret;
+}
+
+#else
+
+
+int
+test_local_addr (const in_addr_t addr) /* PLATFORM-SPECIFIC */
+{
+ return TLA_NOT_IMPLEMENTED;
+}
+
+#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-17 17:20:23 +0000