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authorjames <james@e7ae566f-a301-0410-adde-c780ea21d3b5>2005-09-26 05:28:27 +0000
committerjames <james@e7ae566f-a301-0410-adde-c780ea21d3b5>2005-09-26 05:28:27 +0000
commit6fbf66fad3367b24fd6743bcd50254902fd9c8d5 (patch)
tree9802876e3771744eead18917bb47ff6e90ac39f5 /route.c
downloadopenvpn-6fbf66fad3367b24fd6743bcd50254902fd9c8d5.tar.xz
This is the start of the BETA21 branch.
It includes the --topology feature, and TAP-Win32 driver changes to allow non-admin access. git-svn-id: http://svn.openvpn.net/projects/openvpn/branches/BETA21/openvpn@580 e7ae566f-a301-0410-adde-c780ea21d3b5
Diffstat (limited to 'route.c')
-rw-r--r--route.c1776
1 files changed, 1776 insertions, 0 deletions
diff --git a/route.c b/route.c
new file mode 100644
index 0000000..2c27eaf
--- /dev/null
+++ b/route.c
@@ -0,0 +1,1776 @@
+/*
+ * 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 adding/deleting network routes.
+ */
+
+#ifdef WIN32
+#include "config-win32.h"
+#else
+#include "config.h"
+#endif
+
+#include "syshead.h"
+
+#include "common.h"
+#include "error.h"
+#include "route.h"
+#include "misc.h"
+#include "socket.h"
+#include "manage.h"
+
+#include "memdbg.h"
+
+static void add_route (struct route *r, const struct tuntap *tt, unsigned int flags, const struct env_set *es);
+static void delete_route (const struct route *r, const struct tuntap *tt, unsigned int flags, const struct env_set *es);
+static bool get_default_gateway (in_addr_t *ret);
+
+struct route_option_list *
+new_route_option_list (struct gc_arena *a)
+{
+ struct route_option_list *ret;
+ ALLOC_OBJ_CLEAR_GC (ret, struct route_option_list, a);
+ return ret;
+}
+
+struct route_list *
+new_route_list (struct gc_arena *a)
+{
+ struct route_list *ret;
+ ALLOC_OBJ_CLEAR_GC (ret, struct route_list, a);
+ 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)
+{
+ *status = true;
+ if (!strcmp (string, "vpn_gateway"))
+ {
+ if (spec->remote_endpoint_defined)
+ *out = spec->remote_endpoint;
+ else
+ {
+ msg (M_INFO, PACKAGE_NAME " ROUTE: vpn_gateway undefined");
+ *status = false;
+ }
+ return true;
+ }
+ else if (!strcmp (string, "net_gateway"))
+ {
+ 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");
+ *status = false;
+ }
+ return true;
+ }
+ else if (!strcmp (string, "remote_host"))
+ {
+ if (spec->remote_host_defined)
+ *out = spec->remote_host;
+ else
+ {
+ msg (M_INFO, PACKAGE_NAME " ROUTE: remote_host undefined");
+ *status = false;
+ }
+ return true;
+ }
+ return false;
+}
+
+static bool
+init_route (struct route *r,
+ 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 (
+ GETADDR_RESOLVE
+ | GETADDR_HOST_ORDER
+ | GETADDR_WARN_ON_SIGNAL,
+ ro->network,
+ 0,
+ &status,
+ NULL);
+ }
+
+ 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
+ {
+ r->metric = 0;
+ r->metric_defined = false;
+ }
+
+ 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 >= MAX_ROUTES)
+ msg (M_FATAL, PACKAGE_NAME " ROUTE: cannot add more than %d routes",
+ MAX_ROUTES);
+ 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)
+{
+ CLEAR (*rl);
+}
+
+bool
+init_route_list (struct route_list *rl,
+ const struct route_option_list *opt,
+ const char *remote_endpoint,
+ in_addr_t remote_host,
+ struct env_set *es)
+{
+ bool ret = true;
+
+ clear_route_list (rl);
+
+ if (remote_host)
+ {
+ rl->spec.remote_host = remote_host;
+ rl->spec.remote_host_defined = true;
+ }
+
+ rl->spec.net_gateway_defined = get_default_gateway (&rl->spec.net_gateway);
+ if (rl->spec.net_gateway_defined)
+ {
+ setenv_route_addr (es, "net_gateway", rl->spec.net_gateway, -1);
+ }
+ rl->redirect_default_gateway = opt->redirect_default_gateway;
+ rl->redirect_local = opt->redirect_local;
+ rl->redirect_def1 = opt->redirect_def1;
+
+ 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;
+
+ ASSERT (opt->n >= 0 && opt->n < MAX_ROUTES);
+
+ /* parse the routes from opt to rl */
+ {
+ int i, j = 0;
+ for (i = 0; i < opt->n; ++i)
+ {
+ if (!init_route (&rl->routes[j],
+ &opt->routes[i],
+ &rl->spec))
+ ret = false;
+ else
+ ++j;
+ }
+ rl->n = j;
+ }
+
+ 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
+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->redirect_default_gateway)
+ {
+ 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
+ {
+ /* route remote host to original default gateway */
+ if (!rl->redirect_local)
+ add_route3 (rl->spec.remote_host,
+ ~0,
+ rl->spec.net_gateway,
+ tt,
+ flags,
+ es);
+
+ if (rl->redirect_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->redirect_local)
+ del_route3 (rl->spec.remote_host,
+ ~0,
+ rl->spec.net_gateway,
+ tt,
+ flags,
+ es);
+
+ if (rl->redirect_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);
+ }
+#endif
+
+ for (i = 0; i < rl->n; ++i)
+ {
+ if (flags & ROUTE_DELETE_FIRST)
+ delete_route (&rl->routes[i], tt, flags, es);
+ add_route (&rl->routes[i], 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 (*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->redirect_default_gateway)
+ msg (level, " [redirect_default_gateway local=%d]",
+ rol->redirect_local);
+ 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);
+}
+
+static void
+add_route (struct route *r, const struct tuntap *tt, unsigned int flags, const struct env_set *es)
+{
+ struct gc_arena gc;
+ struct buffer buf;
+ const char *network;
+ const char *netmask;
+ const char *gateway;
+ bool status = false;
+
+ if (!r->defined)
+ return;
+
+ gc_init (&gc);
+ buf = alloc_buf_gc (256, &gc);
+
+ 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
+ buf_printf (&buf, IPROUTE_PATH " route add %s/%d via %s",
+ network,
+ count_netmask_bits(netmask),
+ gateway);
+ if (r->metric_defined)
+ buf_printf (&buf, " metric %d", r->metric);
+
+#else
+ buf_printf (&buf, ROUTE_PATH " add -net %s netmask %s gw %s",
+ network,
+ netmask,
+ gateway);
+ if (r->metric_defined)
+ buf_printf (&buf, " metric %d", r->metric);
+#endif /*CONFIG_FEATURE_IPROUTE*/
+ msg (D_ROUTE, "%s", BSTR (&buf));
+ status = system_check (BSTR (&buf), es, 0, "ERROR: Linux route add command failed");
+
+#elif defined (WIN32)
+
+ buf_printf (&buf, ROUTE_PATH " ADD %s MASK %s %s",
+ network,
+ netmask,
+ gateway);
+ if (r->metric_defined)
+ buf_printf (&buf, " METRIC %d", r->metric);
+
+ msg (D_ROUTE, "%s", BSTR (&buf));
+
+ 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 = system_check (BSTR (&buf), es, 0, "ERROR: Windows route add command failed");
+ netcmd_semaphore_release ();
+ }
+ else
+ {
+ ASSERT (0);
+ }
+
+#elif defined (TARGET_SOLARIS)
+
+ /* example: route add 192.0.2.32 -netmask 255.255.255.224 somegateway */
+
+ buf_printf (&buf, ROUTE_PATH " add");
+
+#if 0
+ if (r->metric_defined)
+ buf_printf (&buf, " -rtt %d", r->metric);
+#endif
+
+ buf_printf (&buf, " %s -netmask %s %s",
+ network,
+ netmask,
+ gateway);
+
+ msg (D_ROUTE, "%s", BSTR (&buf));
+ status = system_check (BSTR (&buf), es, 0, "ERROR: Solaris route add command failed");
+
+#elif defined(TARGET_FREEBSD)
+
+ buf_printf (&buf, ROUTE_PATH " add");
+
+#if 0
+ if (r->metric_defined)
+ buf_printf (&buf, " -rtt %d", r->metric);
+#endif
+
+ buf_printf (&buf, " -net %s %s %s",
+ network,
+ gateway,
+ netmask);
+
+ msg (D_ROUTE, "%s", BSTR (&buf));
+ status = system_check (BSTR (&buf), es, 0, "ERROR: FreeBSD route add command failed");
+
+#elif defined(TARGET_DARWIN)
+
+ buf_printf (&buf, ROUTE_PATH " add");
+
+#if 0
+ if (r->metric_defined)
+ buf_printf (&buf, " -rtt %d", r->metric);
+#endif
+
+ buf_printf (&buf, " -net %s %s %s",
+ network,
+ gateway,
+ netmask);
+
+ msg (D_ROUTE, "%s", BSTR (&buf));
+ status = system_check (BSTR (&buf), es, 0, "ERROR: OS X route add command failed");
+
+#elif defined(TARGET_OPENBSD) || defined(TARGET_NETBSD)
+
+ buf_printf (&buf, ROUTE_PATH " add");
+
+#if 0
+ if (r->metric_defined)
+ buf_printf (&buf, " -rtt %d", r->metric);
+#endif
+
+ buf_printf (&buf, " -net %s %s -netmask %s",
+ network,
+ gateway,
+ netmask);
+
+ msg (D_ROUTE, "%s", BSTR (&buf));
+ status = system_check (BSTR (&buf), 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;
+ 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 buffer buf;
+ const char *network;
+ const char *netmask;
+ const char *gateway;
+
+ if (!r->defined)
+ return;
+
+ gc_init (&gc);
+
+ buf = alloc_buf_gc (256, &gc);
+ 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
+ buf_printf (&buf, IPROUTE_PATH " route del %s/%d",
+ network,
+ count_netmask_bits(netmask));
+#else
+
+ buf_printf (&buf, ROUTE_PATH " del -net %s netmask %s",
+ network,
+ netmask);
+#endif /*CONFIG_FEATURE_IPROUTE*/
+ msg (D_ROUTE, "%s", BSTR (&buf));
+ system_check (BSTR (&buf), es, 0, "ERROR: Linux route delete command failed");
+
+#elif defined (WIN32)
+
+ buf_printf (&buf, ROUTE_PATH " DELETE %s MASK %s %s",
+ network,
+ netmask,
+ gateway);
+
+ msg (D_ROUTE, "%s", BSTR (&buf));
+
+ 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 ();
+ system_check (BSTR (&buf), es, 0, "ERROR: Windows route delete command failed");
+ netcmd_semaphore_release ();
+ }
+ else
+ {
+ ASSERT (0);
+ }
+
+#elif defined (TARGET_SOLARIS)
+
+ buf_printf (&buf, ROUTE_PATH " delete %s -netmask %s %s",
+ network,
+ netmask,
+ gateway);
+
+ msg (D_ROUTE, "%s", BSTR (&buf));
+ system_check (BSTR (&buf), es, 0, "ERROR: Solaris route delete command failed");
+
+#elif defined(TARGET_FREEBSD)
+
+ buf_printf (&buf, ROUTE_PATH " delete -net %s %s %s",
+ network,
+ gateway,
+ netmask);
+
+ msg (D_ROUTE, "%s", BSTR (&buf));
+ system_check (BSTR (&buf), es, 0, "ERROR: FreeBSD route delete command failed");
+
+#elif defined(TARGET_DARWIN)
+
+ buf_printf (&buf, ROUTE_PATH " delete -net %s %s %s",
+ network,
+ gateway,
+ netmask);
+
+ msg (D_ROUTE, "%s", BSTR (&buf));
+ system_check (BSTR (&buf), es, 0, "ERROR: OS X route delete command failed");
+
+#elif defined(TARGET_OPENBSD) || defined(TARGET_NETBSD)
+
+ buf_printf (&buf, ROUTE_PATH " delete -net %s %s -netmask %s",
+ network,
+ gateway,
+ netmask);
+
+ msg (D_ROUTE, "%s", BSTR (&buf));
+ system_check (BSTR (&buf), 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
+
+ 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);
+ 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->redirect_default_gateway && 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 bool
+get_default_gateway (in_addr_t *ret)
+{
+ struct gc_arena gc = gc_new ();
+ bool ret_bool = false;
+ int i;
+ const MIB_IPFORWARDTABLE *routes = get_windows_routing_table (&gc);
+
+ if (!routes)
+ goto done;
+
+ 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 in_addr_t gw = ntohl (row->dwForwardNextHop);
+
+#if 0
+ msg (M_INFO, "route[%d] %s %s %s",
+ i,
+ 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));
+#endif
+ if (!net && !mask)
+ {
+ *ret = gw;
+ ret_bool = true;
+ break;
+ }
+ }
+
+ done:
+ 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 a different forward type (--redirect-gateway over RRAS seems to need this) */
+ fr.dwForwardType = 3; /* the next hop is the final dest */
+
+ status = CreateIpForwardEntry (&fr);
+
+ if (status == NO_ERROR)
+ ret = true;
+ else
+ msg (M_WARN, "ROUTE: route addition failed using CreateIpForwardEntry: %s [if_index=%u]",
+ strerror_win32 (status, &gc),
+ (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)
+
+static bool
+get_default_gateway (in_addr_t *ret)
+{
+ struct gc_arena gc = gc_new ();
+ FILE *fp = fopen ("/proc/net/route", "r");
+ if (fp)
+ {
+ char line[256];
+ int count = 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;
+ const int np = sscanf (line, "%*s\t%x\t%x\t%*s\t%*s\t%*s\t%*s\t%x",
+ &net_x,
+ &gw_x,
+ &mask_x);
+ if (np == 3)
+ {
+ const in_addr_t net = ntohl (net_x);
+ const in_addr_t mask = ntohl (mask_x);
+ const in_addr_t gw = ntohl (gw_x);
+#if 0
+ msg (M_INFO, "route %s %s %s",
+ 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));
+#endif
+ if (!net && !mask)
+ {
+ fclose (fp);
+ *ret = gw;
+ gc_free (&gc);
+ return true;
+ }
+ }
+ }
+ ++count;
+ }
+ fclose (fp);
+ }
+
+ gc_free (&gc);
+ return false;
+}
+
+#elif defined(TARGET_FREEBSD)
+
+#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))
+
+static bool
+get_default_gateway (in_addr_t *ret)
+{
+ 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 1
+ msg (M_INFO, "gw %s",
+ print_in_addr_t ((in_addr_t) *ret, 0, &gc));
+#endif
+
+ 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))
+
+static bool
+get_default_gateway (in_addr_t *ret)
+{
+ 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 1
+ msg (M_INFO, "gw %s",
+ print_in_addr_t ((in_addr_t) *ret, 0, &gc));
+#endif
+
+ 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))
+
+static bool
+get_default_gateway (in_addr_t *ret)
+{
+ 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 1
+ msg (M_INFO, "gw %s",
+ print_in_addr_t ((in_addr_t) *ret, 0, &gc));
+#endif
+
+ gc_free (&gc);
+ return true;
+ }
+ else
+ {
+ gc_free (&gc);
+ return false;
+ }
+}
+
+#else
+
+static bool
+get_default_gateway (in_addr_t *ret)
+{
+ 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;
+}