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openvpn/route.c
james 40ac3d7ac1 Added --route-metric option to set a default route metric 
for --route (Roy Marples).


git-svn-id: http://svn.openvpn.net/projects/openvpn/branches/BETA21/openvpn@1011 e7ae566f-a301-0410-adde-c780ea21d3b5
2006-04-13 20:40:39 +00:00

2020 lines
48 KiB
C
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/*
* 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 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);
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_DEBUG, "ROUTE DEBUG: bypass_host_route[%d]=%s",
i,
print_in_addr_t (rb->bypass[i], 0, &gc));
}
gc_free (&gc);
}
#endif
static bool
add_bypass_address (struct route_bypass *rb, const in_addr_t a)
{
int i;
for (i = 0; i < rb->n_bypass; ++i)
{
if (a == rb->bypass[i]) /* avoid duplicates */
return true;
}
if (rb->n_bypass < N_ROUTE_BYPASS)
{
rb->bypass[rb->n_bypass++] = a;
return true;
}
else
{
return false;
}
}
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 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 >= 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,
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);
if (rl->spec.net_gateway_defined)
{
setenv_route_addr (es, "net_gateway", rl->spec.net_gateway, -1);
dmsg (D_ROUTE_DEBUG, "ROUTE DEBUG: default_gateway=%s", print_in_addr_t (rl->spec.net_gateway, 0, &gc));
}
else
{
dmsg (D_ROUTE_DEBUG, "ROUTE DEBUG: 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;
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;
}
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
{
/* route remote host to original default gateway */
if (!(rl->flags & RG_LOCAL))
add_route3 (rl->spec.remote_host,
~0,
rl->spec.net_gateway,
tt,
flags,
es);
/* 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_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->flags & RG_LOCAL))
del_route3 (rl->spec.remote_host,
~0,
rl->spec.net_gateway,
tt,
flags,
es);
/* delete special DHCP/DNS bypass route */
del_bypass_routes (&rl->spec.bypass, rl->spec.net_gateway, tt, flags, es);
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)
{
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->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 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 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 = system_check (BSTR (&buf), 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 */
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*/
if (r->metric_defined)
buf_printf (&buf, " metric %d", r->metric);
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 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 ();
system_check (BSTR (&buf), es, 0, "ERROR: Windows route delete command failed [adaptive]");
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->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;
}
static bool
get_default_gateway (in_addr_t *ret)
{
struct gc_arena gc = gc_new ();
bool ret_bool = false;
const MIB_IPFORWARDTABLE *routes = get_windows_routing_table (&gc);
const MIB_IPFORWARDROW *row = get_default_gateway_row (routes);
if (row)
{
*ret = ntohl (row->dwForwardNextHop);
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 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 *gateway)
{
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;
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)
#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;
}
/*
* 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, const IP_ADAPTER_INFO *dgi)
{
if (!is_ip_in_adapter_subnet (dgi, addr, NULL))
add_bypass_address (rb, addr);
}
static void
add_host_route_array (struct route_bypass *rb, const IP_ADAPTER_INFO *dgi, 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, dgi);
}
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, &dgi->DhcpServer);
/* Bypass DNS server addresses */
if ((flags & RG_BYPASS_DNS) && pai)
add_host_route_array (rb, dgi, &pai->DnsServerList);
}
gc_free (&gc);
}
#else
static void
get_bypass_addresses (struct route_bypass *rb, const unsigned int flags)
{
}
#endif
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