mirror/openvpn
0
0
Fork 0
mirror of https://github.com/OpenVPN/openvpn.git synced 2024-09-20 03:52:28 +02:00
Code
3c19fcc209
openvpn/route.c
James Yonan 8fc83a2d6c Added support for "on-link" routes on Linux client 
These are routes where the gateway is specified as an interface rather
than an address. This allows redirect-gateway to work on Linux clients
whose connection to the internet is via a point-to-point link such as
PPP.

Note that at the moment, this capability is incompatible with
the "redirect-gateway block-local" directive -- this is because
the block-local directive blocks all traffic from the local LAN
except for the local and gateway addresses.  Since a PPP link
is essentially a subnet of two addresses, local and remote (i.e.
gateway), the set of addresses that would be blocked by block-local
is empty.  Therefore, the "redirect-gateway block-local" directive
will be ignored on PPP links.

To view the OpenVPN client's current determination of the default
gateway, use this command:

  ./openvpn --show-gateway

git-svn-id: http://svn.openvpn.net/projects/openvpn/branches/BETA21/openvpn@7794 e7ae566f-a301-0410-adde-c780ea21d3b5
Signed-off-by: James Yonan <james@openvpn.net>
Signed-off-by: David Sommerseth <davids@redhat.com>
2012-01-27 10:33:56 +01:00

3238 lines
81 KiB
C
Raw Blame History

/*
* 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 "options.h"
#include "memdbg.h"
static void delete_route (struct route *r, const struct tuntap *tt, unsigned int flags, const struct route_gateway_info *rgi, 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
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 (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_ipv6_option_list *
new_route_ipv6_option_list (const int max_routes, struct gc_arena *a)
{
struct route_ipv6_option_list *ret;
ALLOC_VAR_ARRAY_CLEAR_GC (ret, struct route_ipv6_option_list, struct route_ipv6_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;
}
struct route_ipv6_option_list *
clone_route_ipv6_option_list (const struct route_ipv6_option_list *src, struct gc_arena *a)
{
const size_t rl_size = array_mult_safe (sizeof(struct route_ipv6_option), src->capacity, sizeof(struct route_ipv6_option_list));
struct route_ipv6_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->capacity > 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->capacity, dest->capacity);
memcpy (dest, src, src_size);
}
void
copy_route_ipv6_option_list (struct route_ipv6_option_list *dest,
const struct route_ipv6_option_list *src)
{
const size_t src_size = array_mult_safe (sizeof(struct route_ipv6_option), src->capacity, sizeof(struct route_ipv6_option_list));
if (src->capacity > 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->capacity, 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;
}
struct route_ipv6_list *
new_route_ipv6_list (const int max_routes, struct gc_arena *a)
{
struct route_ipv6_list *ret;
ALLOC_VAR_ARRAY_CLEAR_GC (ret, struct route_ipv6_list, struct route_ipv6, 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->flags & RT_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_list *rl,
const char *string,
in_addr_t *out,
bool *status)
{
if (status)
*status = true;
if (!strcmp (string, "vpn_gateway"))
{
if (rl)
{
if (rl->spec.flags & RTSA_REMOTE_ENDPOINT)
*out = rl->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 (rl)
{
if (rl->rgi.flags & RGI_ADDR_DEFINED)
*out = rl->rgi.gateway.addr;
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 (rl)
{
if (rl->spec.flags & RTSA_REMOTE_HOST)
*out = rl->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_list *rl)
{
const in_addr_t default_netmask = ~0;
bool status;
CLEAR (*r);
r->option = ro;
/* network */
if (!is_route_parm_defined (ro->network))
{
goto fail;
}
if (!get_special_addr (rl, 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 (rl, 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 (rl->spec.flags & RTSA_REMOTE_ENDPOINT)
r->gateway = rl->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 = 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->flags |= RT_METRIC_DEFINED;
}
else if (rl->spec.flags & RTSA_DEFAULT_METRIC)
{
r->metric = rl->spec.default_metric;
r->flags |= RT_METRIC_DEFINED;
}
r->flags |= RT_DEFINED;
return true;
fail:
msg (M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve route for host/network: %s",
ro->network);
return false;
}
static bool
init_route_ipv6 (struct route_ipv6 *r6,
const struct route_ipv6_option *r6o,
const struct route_ipv6_list *rl6 )
{
r6->option = r6o;
r6->defined = false;
if ( !get_ipv6_addr( r6o->prefix, &r6->network, &r6->netbits, NULL, M_WARN ))
goto fail;
/* gateway */
if (is_route_parm_defined (r6o->gateway))
{
if ( inet_pton( AF_INET6, r6o->gateway, &r6->gateway ) != 1 )
{
msg( M_WARN, PACKAGE_NAME "ROUTE6: cannot parse gateway spec '%s'", r6o->gateway );
}
}
else if (rl6->remote_endpoint_defined)
{
r6->gateway = rl6->remote_endpoint_ipv6;
}
else
{
msg (M_WARN, PACKAGE_NAME " ROUTE6: " PACKAGE_NAME " needs a gateway parameter for a --route-ipv6 option and no default was specified by either --route-ipv6-gateway or --ifconfig-ipv6 options");
goto fail;
}
/* metric */
r6->metric_defined = false;
r6->metric = 0;
if (is_route_parm_defined (r6o->metric))
{
r6->metric = atoi (r6o->metric);
if (r6->metric < 0)
{
msg (M_WARN, PACKAGE_NAME " ROUTE: route metric for network %s (%s) must be >= 0",
r6o->prefix,
r6o->metric);
goto fail;
}
r6->metric_defined = true;
}
else if (rl6->default_metric_defined)
{
r6->metric = rl6->default_metric;
r6->metric_defined = true;
}
r6->defined = true;
return true;
fail:
msg (M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve route for host/network: %s",
r6o->prefix);
r6->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
add_route_ipv6_to_option_list (struct route_ipv6_option_list *l,
const char *prefix,
const char *gateway,
const char *metric)
{
struct route_ipv6_option *ro;
if (l->n >= l->capacity)
msg (M_FATAL, PACKAGE_NAME " ROUTE: cannot add more than %d IPv6 routes -- please increase the max-routes option in the client configuration file",
l->capacity);
ro = &l->routes_ipv6[l->n];
ro->prefix = prefix;
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
clear_route_ipv6_list (struct route_ipv6_list *rl6)
{
const int capacity = rl6->capacity;
const size_t rl6_size = array_mult_safe (sizeof(struct route_ipv6), capacity, sizeof(struct route_ipv6_list));
memset(rl6, 0, rl6_size);
rl6->capacity = capacity;
}
void
route_list_add_vpn_gateway (struct route_list *rl,
struct env_set *es,
const in_addr_t addr)
{
rl->spec.remote_endpoint = addr;
rl->spec.flags |= RTSA_REMOTE_ENDPOINT;
setenv_route_addr (es, "vpn_gateway", rl->spec.remote_endpoint, -1);
}
static void
add_block_local_item (struct route_list *rl,
const struct route_gateway_address *gateway,
in_addr_t target)
{
const int rgi_needed = (RGI_ADDR_DEFINED|RGI_NETMASK_DEFINED);
if ((rl->rgi.flags & rgi_needed) == rgi_needed
&& rl->rgi.gateway.netmask < 0xFFFFFFFF
&& (rl->n)+2 <= rl->capacity)
{
struct route r;
unsigned int l2;
/* split a route into two smaller blocking routes, and direct them to target */
CLEAR(r);
r.flags = RT_DEFINED;
r.gateway = target;
r.network = gateway->addr & gateway->netmask;
l2 = ((~gateway->netmask)+1)>>1;
r.netmask = ~(l2-1);
rl->routes[rl->n++] = r;
r.network += l2;
rl->routes[rl->n++] = r;
}
}
static void
add_block_local (struct route_list *rl)
{
const int rgi_needed = (RGI_ADDR_DEFINED|RGI_NETMASK_DEFINED);
if ((rl->flags & RG_BLOCK_LOCAL)
&& (rl->rgi.flags & rgi_needed) == rgi_needed
&& (rl->spec.flags & RTSA_REMOTE_ENDPOINT)
&& rl->spec.remote_host_local != TLA_LOCAL)
{
size_t i;
/* add bypass for gateway addr */
add_bypass_address (&rl->spec.bypass, rl->rgi.gateway.addr);
/* block access to local subnet */
add_block_local_item (rl, &rl->rgi.gateway, rl->spec.remote_endpoint);
/* process additional subnets on gateway interface */
for (i = 0; i < rl->rgi.n_addrs; ++i)
{
const struct route_gateway_address *gwa = &rl->rgi.addrs[i];
/* omit the add/subnet in &rl->rgi which we processed above */
if (!((rl->rgi.gateway.addr & rl->rgi.gateway.netmask) == (gwa->addr & gwa->netmask)
&& rl->rgi.gateway.netmask == gwa->netmask))
add_block_local_item (rl, gwa, rl->spec.remote_endpoint);
}
}
}
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.flags |= RTSA_REMOTE_HOST;
}
if (default_metric)
{
rl->spec.default_metric = default_metric;
rl->spec.flags |= RTSA_DEFAULT_METRIC;
}
get_default_gateway (&rl->rgi);
if (rl->rgi.flags & RGI_ADDR_DEFINED)
{
setenv_route_addr (es, "net_gateway", rl->rgi.gateway.addr, -1);
#ifdef ENABLE_DEBUG
print_default_gateway (D_ROUTE, &rl->rgi);
#endif
}
else
{
dmsg (D_ROUTE, "ROUTE: default_gateway=UNDEF");
}
if (rl->spec.flags & RTSA_REMOTE_HOST)
rl->spec.remote_host_local = test_local_addr (remote_host, &rl->rgi);
if (is_route_parm_defined (remote_endpoint))
{
bool defined = false;
rl->spec.remote_endpoint = getaddr (
GETADDR_RESOLVE
| GETADDR_HOST_ORDER
| GETADDR_WARN_ON_SIGNAL,
remote_endpoint,
0,
&defined,
NULL);
if (defined)
{
setenv_route_addr (es, "vpn_gateway", rl->spec.remote_endpoint, -1);
rl->spec.flags |= RTSA_REMOTE_ENDPOINT;
}
else
{
msg (M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve default gateway: %s",
remote_endpoint);
ret = false;
}
}
if (rl->flags & RG_ENABLE)
{
add_block_local (rl);
get_bypass_addresses (&rl->spec.bypass, rl->flags);
#ifdef ENABLE_DEBUG
print_bypass_addresses (&rl->spec.bypass);
#endif
}
/* parse the routes from opt to rl */
{
int i = 0;
int j = rl->n;
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))
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;
}
bool
init_route_ipv6_list (struct route_ipv6_list *rl6,
const struct route_ipv6_option_list *opt6,
const char *remote_endpoint,
int default_metric,
struct env_set *es)
{
struct gc_arena gc = gc_new ();
bool ret = true;
clear_route_ipv6_list (rl6);
rl6->flags = opt6->flags;
if (default_metric)
{
rl6->default_metric = default_metric;
rl6->default_metric_defined = true;
}
/* "default_gateway" is stuff for "redirect-gateway", which we don't
* do for IPv6 yet -> TODO
*/
{
dmsg (D_ROUTE, "ROUTE6: default_gateway=UNDEF");
}
if ( is_route_parm_defined( remote_endpoint ))
{
if ( inet_pton( AF_INET6, remote_endpoint,
&rl6->remote_endpoint_ipv6) == 1 )
{
rl6->remote_endpoint_defined = true;
}
else
{
msg (M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve default gateway: %s", remote_endpoint);
ret = false;
}
}
else
rl6->remote_endpoint_defined = false;
if (!(opt6->n >= 0 && opt6->n <= rl6->capacity))
msg (M_FATAL, PACKAGE_NAME " ROUTE6: (init) number of route options (%d) is greater than route list capacity (%d)", opt6->n, rl6->capacity);
/* parse the routes from opt to rl6 */
{
int i, j = 0;
for (i = 0; i < opt6->n; ++i)
{
if (!init_route_ipv6 (&rl6->routes_ipv6[j],
&opt6->routes_ipv6[i],
rl6 ))
ret = false;
else
++j;
}
rl6->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 route_gateway_info *rgi,
const struct env_set *es)
{
struct route r;
CLEAR (r);
r.flags = RT_DEFINED;
r.network = network;
r.netmask = netmask;
r.gateway = gateway;
add_route (&r, tt, flags, rgi, 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 route_gateway_info *rgi,
const struct env_set *es)
{
struct route r;
CLEAR (r);
r.flags = RT_DEFINED|RT_ADDED;
r.network = network;
r.netmask = netmask;
r.gateway = gateway;
delete_route (&r, tt, flags, rgi, es);
}
static void
add_bypass_routes (struct route_bypass *rb,
in_addr_t gateway,
const struct tuntap *tt,
unsigned int flags,
const struct route_gateway_info *rgi,
const struct env_set *es)
{
int i;
for (i = 0; i < rb->n_bypass; ++i)
{
if (rb->bypass[i])
add_route3 (rb->bypass[i],
~0,
gateway,
tt,
flags | ROUTE_REF_GW,
rgi,
es);
}
}
static void
del_bypass_routes (struct route_bypass *rb,
in_addr_t gateway,
const struct tuntap *tt,
unsigned int flags,
const struct route_gateway_info *rgi,
const struct env_set *es)
{
int i;
for (i = 0; i < rb->n_bypass; ++i)
{
if (rb->bypass[i])
del_route3 (rb->bypass[i],
~0,
gateway,
tt,
flags | ROUTE_REF_GW,
rgi,
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 && rl->flags & RG_ENABLE )
{
if (!(rl->spec.flags & RTSA_REMOTE_ENDPOINT))
{
msg (M_WARN, "%s VPN gateway parameter (--route-gateway or --ifconfig) is missing", err);
}
else if (!(rl->rgi.flags & RGI_ADDR_DEFINED))
{
msg (M_WARN, "%s Cannot read current default gateway from system", err);
}
else if (!(rl->spec.flags & RTSA_REMOTE_HOST))
{
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 = rl->spec.remote_host_local;
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 */
/* if remote_host is not ipv4 (ie: ipv6), just skip
* adding this special /32 route */
if (rl->spec.remote_host != IPV4_INVALID_ADDR) {
add_route3 (rl->spec.remote_host,
~0,
rl->rgi.gateway.addr,
tt,
flags | ROUTE_REF_GW,
&rl->rgi,
es);
rl->iflags |= RL_DID_LOCAL;
} else {
dmsg (D_ROUTE, "ROUTE remote_host protocol differs from tunneled");
}
}
/* route DHCP/DNS server traffic through original default gateway */
add_bypass_routes (&rl->spec.bypass, rl->rgi.gateway.addr, tt, flags, &rl->rgi, 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,
&rl->rgi,
es);
/* add new default route (2nd component) */
add_route3 (0x80000000,
0x80000000,
rl->spec.remote_endpoint,
tt,
flags,
&rl->rgi,
es);
}
else
{
/* delete default route */
del_route3 (0,
0,
rl->rgi.gateway.addr,
tt,
flags | ROUTE_REF_GW,
&rl->rgi,
es);
/* add new default route */
add_route3 (0,
0,
rl->spec.remote_endpoint,
tt,
flags,
&rl->rgi,
es);
}
}
/* set a flag so we can undo later */
rl->iflags |= RL_DID_REDIRECT_DEFAULT_GATEWAY;
}
}
}
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 && rl->iflags & RL_DID_REDIRECT_DEFAULT_GATEWAY )
{
/* delete remote host route */
if (rl->iflags & RL_DID_LOCAL)
{
del_route3 (rl->spec.remote_host,
~0,
rl->rgi.gateway.addr,
tt,
flags | ROUTE_REF_GW,
&rl->rgi,
es);
rl->iflags &= ~RL_DID_LOCAL;
}
/* delete special DHCP/DNS bypass route */
del_bypass_routes (&rl->spec.bypass, rl->rgi.gateway.addr, tt, flags, &rl->rgi, 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,
&rl->rgi,
es);
/* delete default route (2nd component) */
del_route3 (0x80000000,
0x80000000,
rl->spec.remote_endpoint,
tt,
flags,
&rl->rgi,
es);
}
else
{
/* delete default route */
del_route3 (0,
0,
rl->spec.remote_endpoint,
tt,
flags,
&rl->rgi,
es);
/* restore original default route */
add_route3 (0,
0,
rl->rgi.gateway.addr,
tt,
flags | ROUTE_REF_GW,
&rl->rgi,
es);
}
}
rl->iflags &= ~RL_DID_REDIRECT_DEFAULT_GATEWAY;
}
}
void
add_routes (struct route_list *rl, struct route_ipv6_list *rl6, const struct tuntap *tt, unsigned int flags, const struct env_set *es)
{
redirect_default_route_to_vpn (rl, tt, flags, es);
if ( rl && !(rl->iflags & 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, &rl->rgi, es);
add_route (r, tt, flags, &rl->rgi, es);
}
rl->iflags |= RL_ROUTES_ADDED;
}
if (rl6 && !rl6->routes_added)
{
int i;
for (i = 0; i < rl6->n; ++i)
{
struct route_ipv6 *r = &rl6->routes_ipv6[i];
if (flags & ROUTE_DELETE_FIRST)
delete_route_ipv6 (r, tt, flags, es);
add_route_ipv6 (r, tt, flags, es);
}
rl6->routes_added = true;
}
}
void
delete_routes (struct route_list *rl, struct route_ipv6_list *rl6,
const struct tuntap *tt, unsigned int flags, const struct env_set *es)
{
if ( rl && rl->iflags & RL_ROUTES_ADDED )
{
int i;
for (i = rl->n - 1; i >= 0; --i)
{
struct route * r = &rl->routes[i];
delete_route (r, tt, flags, &rl->rgi, es);
}
rl->iflags &= ~RL_ROUTES_ADDED;
}
undo_redirect_default_route_to_vpn (rl, tt, flags, es);
if ( rl )
{
clear_route_list (rl);
}
if ( rl6 && rl6->routes_added )
{
int i;
for (i = rl6->n - 1; i >= 0; --i)
{
const struct route_ipv6 *r6 = &rl6->routes_ipv6[i];
delete_route_ipv6 (r6, tt, flags, es);
}
rl6->routes_added = false;
}
if ( rl6 )
{
clear_route_ipv6_list (rl6);
}
}
#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);
}
void
print_default_gateway(const int msglevel, const struct route_gateway_info *rgi)
{
struct gc_arena gc = gc_new ();
if (rgi->flags & RGI_ADDR_DEFINED)
{
struct buffer out = alloc_buf_gc (256, &gc);
buf_printf (&out, "ROUTE_GATEWAY");
if (rgi->flags & RGI_ON_LINK)
buf_printf (&out, " ON_LINK");
else
buf_printf (&out, " %s", print_in_addr_t (rgi->gateway.addr, 0, &gc));
if (rgi->flags & RGI_NETMASK_DEFINED)
buf_printf (&out, "/%s", print_in_addr_t (rgi->gateway.netmask, 0, &gc));
#ifdef WIN32
if (rgi->flags & RGI_IFACE_DEFINED)
buf_printf (&out, " I=%u", (unsigned int)rgi->adapter_index);
#else
if (rgi->flags & RGI_IFACE_DEFINED)
buf_printf (&out, " IFACE=%s", rgi->iface);
#endif
if (rgi->flags & RGI_HWADDR_DEFINED)
buf_printf (&out, " HWADDR=%s", format_hex_ex (rgi->hwaddr, 6, 0, 1, ":", &gc));
msg (msglevel, "%s", BSTR (&out));
}
gc_free (&gc);
}
#endif
static void
print_route (const struct route *r, int level)
{
struct gc_arena gc = gc_new ();
if (r->flags & RT_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->flags & RT_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->flags & RT_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
setenv_route_ipv6 (struct env_set *es, const struct route_ipv6 *r6, int i)
{
struct gc_arena gc = gc_new ();
if (r6->defined)
{
struct buffer name1 = alloc_buf_gc( 256, &gc );
struct buffer val = alloc_buf_gc( 256, &gc );
struct buffer name2 = alloc_buf_gc( 256, &gc );
buf_printf( &name1, "route_ipv6_network_%d", i );
buf_printf( &val, "%s/%d", print_in6_addr( r6->network, 0, &gc ),
r6->netbits );
setenv_str( es, BSTR(&name1), BSTR(&val) );
buf_printf( &name2, "route_ipv6_gateway_%d", i );
setenv_str( es, BSTR(&name2), print_in6_addr( r6->gateway, 0, &gc ));
}
gc_free (&gc);
}
void
setenv_routes_ipv6 (struct env_set *es, const struct route_ipv6_list *rl6)
{
int i;
for (i = 0; i < rl6->n; ++i)
setenv_route_ipv6 (es, &rl6->routes_ipv6[i], i + 1);
}
/*
* local_route() determines whether the gateway of a provided host
* route is on the same interface that owns the default gateway.
* It uses the data structure
* returned by get_default_gateway() (struct route_gateway_info)
* to determine this. If the route is local, LR_MATCH is returned.
* When adding routes into the kernel, if LR_MATCH is defined for
* a given route, the route should explicitly reference the default
* gateway interface as the route destination. For example, here
* is an example on Linux that uses LR_MATCH:
*
* route add -net 10.10.0.1 netmask 255.255.255.255 dev eth0
*
* This capability is needed by the "default-gateway block-local"
* directive, to allow client access to the local subnet to be
* blocked but still allow access to the local default gateway.
*/
/* local_route() return values */
#define LR_NOMATCH 0 /* route is not local */
#define LR_MATCH 1 /* route is local */
#define LR_ERROR 2 /* caller should abort adding route */
static int
local_route (in_addr_t network,
in_addr_t netmask,
in_addr_t gateway,
const struct route_gateway_info *rgi)
{
/* set LR_MATCH on local host routes */
const int rgi_needed = (RGI_ADDR_DEFINED|RGI_NETMASK_DEFINED|RGI_IFACE_DEFINED);
if (rgi
&& (rgi->flags & rgi_needed) == rgi_needed
&& gateway == rgi->gateway.addr
&& netmask == 0xFFFFFFFF)
{
if (((network ^ rgi->gateway.addr) & rgi->gateway.netmask) == 0)
return LR_MATCH;
else
{
/* examine additional subnets on gateway interface */
size_t i;
for (i = 0; i < rgi->n_addrs; ++i)
{
const struct route_gateway_address *gwa = &rgi->addrs[i];
if (((network ^ gwa->addr) & gwa->netmask) == 0)
return LR_MATCH;
}
}
}
return LR_NOMATCH;
}
/* Return true if the "on-link" form of the route should be used. This is when the gateway for a
a route is specified as an interface rather than an address. */
static inline bool
is_on_link (const int is_local_route, const unsigned int flags, const struct route_gateway_info *rgi)
{
return rgi && (is_local_route == LR_MATCH || ((flags & ROUTE_REF_GW) && (rgi->flags & RGI_ON_LINK)));
}
void
add_route (struct route *r,
const struct tuntap *tt,
unsigned int flags,
const struct route_gateway_info *rgi, /* may be NULL */
const struct env_set *es)
{
struct gc_arena gc;
struct argv argv;
const char *network;
const char *netmask;
const char *gateway;
bool status = false;
int is_local_route;
if (!(r->flags & RT_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);
is_local_route = local_route(r->network, r->netmask, r->gateway, rgi);
if (is_local_route == LR_ERROR)
goto done;
#if defined(TARGET_LINUX)
#ifdef CONFIG_FEATURE_IPROUTE
/* FIXME -- add on-link support for CONFIG_FEATURE_IPROUTE */
argv_printf (&argv, "%s route add %s/%d via %s",
iproute_path,
network,
count_netmask_bits(netmask),
gateway);
if (r->flags & RT_METRIC_DEFINED)
argv_printf_cat (&argv, "metric %d", r->metric);
#else
argv_printf (&argv, "%s add -net %s netmask %s",
ROUTE_PATH,
network,
netmask);
if (r->flags & RT_METRIC_DEFINED)
argv_printf_cat (&argv, "metric %d", r->metric);
if (is_on_link (is_local_route, flags, rgi))
argv_printf_cat (&argv, "dev %s", rgi->iface);
else
argv_printf_cat (&argv, "gw %s", gateway);
#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)
{
DWORD ai = ~0;
argv_printf (&argv, "%s%sc ADD %s MASK %s %s",
get_win_sys_path(),
WIN_ROUTE_PATH_SUFFIX,
network,
netmask,
gateway);
if (r->flags & RT_METRIC_DEFINED)
argv_printf_cat (&argv, "METRIC %d", r->metric);
if (is_on_link (is_local_route, flags, rgi))
{
ai = rgi->adapter_index;
argv_printf_cat (&argv, "IF %u", (unsigned int)ai);
}
argv_msg (D_ROUTE, &argv);
if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_IPAPI)
{
status = add_route_ipapi (r, tt, ai);
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, ai);
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);
#if 0
if (r->flags & RT_METRIC_DEFINED)
argv_printf_cat (&argv, "-rtt %d", r->metric);
#endif
argv_printf_cat (&argv, "%s -netmask %s %s",
network,
netmask,
gateway);
/* FIXME -- add on-link support for Solaris */
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->flags & RT_METRIC_DEFINED)
argv_printf_cat (&argv, "-rtt %d", r->metric);
#endif
argv_printf_cat (&argv, "-net %s %s %s",
network,
gateway,
netmask);
/* FIXME -- add on-link support for FreeBSD */
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->flags & RT_METRIC_DEFINED)
argv_printf_cat (&argv, "-rtt %d", r->metric);
#endif
argv_printf_cat (&argv, "-net %s %s %s",
network,
gateway,
netmask);
/* FIXME -- add on-link support for Dragonfly */
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->flags & RT_METRIC_DEFINED)
argv_printf_cat (&argv, "-rtt %d", r->metric);
#endif
if (is_on_link (is_local_route, flags, rgi))
{
/* Mac OS X route syntax for ON_LINK:
route add -cloning -net 10.10.0.1 -netmask 255.255.255.255 -interface en0 */
argv_printf_cat (&argv, "-cloning -net %s -netmask %s -interface %s",
network,
netmask,
rgi->iface);
}
else
{
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->flags & RT_METRIC_DEFINED)
argv_printf_cat (&argv, "-rtt %d", r->metric);
#endif
argv_printf_cat (&argv, "-net %s %s -netmask %s",
network,
gateway,
netmask);
/* FIXME -- add on-link support for OpenBSD/NetBSD */
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:
if (status)
r->flags |= RT_ADDED;
else
r->flags &= ~RT_ADDED;
argv_reset (&argv);
gc_free (&gc);
}
static const char *
print_in6_addr_netbits_only( struct in6_addr network_copy, int netbits,
struct gc_arena * gc)
{
/* clear host bit parts of route
* (needed if routes are specified improperly, or if we need to
* explicitely setup/clear the "connected" network routes on some OSes)
*/
int byte = 15;
int bits_to_clear = 128 - netbits;
while( byte >= 0 && bits_to_clear > 0 )
{
if ( bits_to_clear >= 8 )
{ network_copy.s6_addr[byte--] = 0; bits_to_clear -= 8; }
else
{ network_copy.s6_addr[byte--] &= (~0 << bits_to_clear); bits_to_clear = 0; }
}
return print_in6_addr( network_copy, 0, gc);
}
void
add_route_ipv6 (struct route_ipv6 *r6, const struct tuntap *tt, unsigned int flags, const struct env_set *es)
{
struct gc_arena gc;
struct argv argv;
const char *network;
const char *gateway;
bool status = false;
const char *device = tt->actual_name;
if (!r6->defined)
return;
gc_init (&gc);
argv_init (&argv);
network = print_in6_addr_netbits_only( r6->network, r6->netbits, &gc);
gateway = print_in6_addr( r6->gateway, 0, &gc);
if ( !tt->ipv6 )
{
msg( M_INFO, "add_route_ipv6(): not adding %s/%d, no IPv6 on if %s",
network, r6->netbits, device );
return;
}
msg( M_INFO, "add_route_ipv6(%s/%d -> %s metric %d) dev %s",
network, r6->netbits, gateway, r6->metric, device );
/*
* Filter out routes which are essentially no-ops
* (not currently done for IPv6)
*/
#if defined(TARGET_LINUX)
#ifdef CONFIG_FEATURE_IPROUTE
argv_printf (&argv, "%s -6 route add %s/%d dev %s",
iproute_path,
network,
r6->netbits,
device);
if (r6->metric_defined)
argv_printf_cat (&argv, " metric %d", r6->metric);
#else
argv_printf (&argv, "%s -A inet6 add %s/%d dev %s",
ROUTE_PATH,
network,
r6->netbits,
device);
if (r6->metric_defined)
argv_printf_cat (&argv, " metric %d", r6->metric);
#endif /*CONFIG_FEATURE_IPROUTE*/
argv_msg (D_ROUTE, &argv);
status = openvpn_execve_check (&argv, es, 0, "ERROR: Linux route -6/-A inet6 add command failed");
#elif defined (WIN32)
/* netsh interface ipv6 add route 2001:db8::/32 MyTunDevice */
argv_printf (&argv, "%s%sc interface ipv6 add route %s/%d %s",
get_win_sys_path(),
NETSH_PATH_SUFFIX,
network,
r6->netbits,
device);
/* next-hop depends on TUN or TAP mode:
* - in TAP mode, we use the "real" next-hop
* - in TUN mode we use a special-case link-local address that the tapdrvr
* knows about and will answer ND (neighbor discovery) packets for
*/
if ( tt->type == DEV_TYPE_TUN )
argv_printf_cat( &argv, " %s", "fe80::8" );
else
argv_printf_cat( &argv, " %s", gateway );
#if 0
if (r->metric_defined)
argv_printf_cat (&argv, " METRIC %d", r->metric);
#endif
/* in some versions of Windows, routes are persistent across reboots by
* default, unless "store=active" is set (pointed out by Tony Lim, thanks)
*/
argv_printf_cat( &argv, " store=active" );
argv_msg (D_ROUTE, &argv);
netcmd_semaphore_lock ();
status = openvpn_execve_check (&argv, es, 0, "ERROR: Windows route add ipv6 command failed");
netcmd_semaphore_release ();
#elif defined (TARGET_SOLARIS)
/* example: route add -inet6 2001:db8::/32 somegateway 0 */
/* for some weird reason, this does not work for me unless I set
* "metric 0" - otherwise, the routes will be nicely installed, but
* packets will just disappear somewhere. So we use "0" now...
*/
argv_printf (&argv, "%s add -inet6 %s/%d %s 0",
ROUTE_PATH,
network,
r6->netbits,
gateway );
argv_msg (D_ROUTE, &argv);
status = openvpn_execve_check (&argv, es, 0, "ERROR: Solaris route add -inet6 command failed");
#elif defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY)
argv_printf (&argv, "%s add -inet6 %s/%d -iface %s",
ROUTE_PATH,
network,
r6->netbits,
device );
argv_msg (D_ROUTE, &argv);
status = openvpn_execve_check (&argv, es, 0, "ERROR: *BSD route add -inet6 command failed");
#elif defined(TARGET_DARWIN)
argv_printf (&argv, "%s add -inet6 %s -prefixlen %d -iface %s",
ROUTE_PATH,
network, r6->netbits, device );
argv_msg (D_ROUTE, &argv);
status = openvpn_execve_check (&argv, es, 0, "ERROR: MacOS X route add -inet6 command failed");
#elif defined(TARGET_OPENBSD)
argv_printf (&argv, "%s add -inet6 %s -prefixlen %d %s",
ROUTE_PATH,
network, r6->netbits, gateway );
argv_msg (D_ROUTE, &argv);
status = openvpn_execve_check (&argv, es, 0, "ERROR: OpenBSD route add -inet6 command failed");
#elif defined(TARGET_NETBSD)
argv_printf (&argv, "%s add -inet6 %s/%d %s",
ROUTE_PATH,
network, r6->netbits, gateway );
argv_msg (D_ROUTE, &argv);
status = openvpn_execve_check (&argv, es, 0, "ERROR: NetBSD route add -inet6 command failed");
#else
msg (M_FATAL, "Sorry, but I don't know how to do 'route ipv6' commands on this operating system. Try putting your routes in a --route-up script");
#endif
r6->defined = status;
argv_reset (&argv);
gc_free (&gc);
}
static void
delete_route (struct route *r,
const struct tuntap *tt,
unsigned int flags,
const struct route_gateway_info *rgi,
const struct env_set *es)
{
struct gc_arena gc;
struct argv argv;
const char *network;
const char *netmask;
const char *gateway;
int is_local_route;
if ((r->flags & (RT_DEFINED|RT_ADDED)) != (RT_DEFINED|RT_ADDED))
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);
is_local_route = local_route(r->network, r->netmask, r->gateway, rgi);
if (is_local_route == LR_ERROR)
goto done;
#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->flags & RT_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)
if (is_on_link (is_local_route, flags, rgi))
{
argv_printf (&argv, "%s delete -cloning -net %s -netmask %s -interface %s",
ROUTE_PATH,
network,
netmask,
rgi->iface);
}
else
{
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
done:
r->flags &= ~RT_ADDED;
argv_reset (&argv);
gc_free (&gc);
}
void
delete_route_ipv6 (const struct route_ipv6 *r6, const struct tuntap *tt, unsigned int flags, const struct env_set *es)
{
struct gc_arena gc;
struct argv argv;
const char *network;
const char *gateway;
const char *device = tt->actual_name;
if (!r6->defined)
return;
gc_init (&gc);
argv_init (&argv);
network = print_in6_addr_netbits_only( r6->network, r6->netbits, &gc);
gateway = print_in6_addr( r6->gateway, 0, &gc);
if ( !tt->ipv6 )
{
msg( M_INFO, "delete_route_ipv6(): not deleting %s/%d, no IPv6 on if %s",
network, r6->netbits, device );
return;
}
msg( M_INFO, "delete_route_ipv6(%s/%d)", network, r6->netbits );
#if defined(TARGET_LINUX)
#ifdef CONFIG_FEATURE_IPROUTE
argv_printf (&argv, "%s -6 route del %s/%d dev %s",
iproute_path,
network,
r6->netbits,
device);
#else
argv_printf (&argv, "%s -A inet6 del %s/%d dev %s",
ROUTE_PATH,
network,
r6->netbits,
device);
#endif /*CONFIG_FEATURE_IPROUTE*/
argv_msg (D_ROUTE, &argv);
openvpn_execve_check (&argv, es, 0, "ERROR: Linux route -6/-A inet6 del command failed");
#elif defined (WIN32)
/* netsh interface ipv6 delete route 2001:db8::/32 MyTunDevice */
argv_printf (&argv, "%s%sc interface ipv6 delete route %s/%d %s",
get_win_sys_path(),
NETSH_PATH_SUFFIX,
network,
r6->netbits,
device);
/* next-hop depends on TUN or TAP mode:
* - in TAP mode, we use the "real" next-hop
* - in TUN mode we use a special-case link-local address that the tapdrvr
* knows about and will answer ND (neighbor discovery) packets for
* (and "route deletion without specifying next-hop" does not work...)
*/
if ( tt->type == DEV_TYPE_TUN )
argv_printf_cat( &argv, " %s", "fe80::8" );
else
argv_printf_cat( &argv, " %s", gateway );
#if 0
if (r->metric_defined)
argv_printf_cat (&argv, "METRIC %d", r->metric);
#endif
argv_msg (D_ROUTE, &argv);
netcmd_semaphore_lock ();
openvpn_execve_check (&argv, es, 0, "ERROR: Windows route add ipv6 command failed");
netcmd_semaphore_release ();
#elif defined (TARGET_SOLARIS)
/* example: route delete -inet6 2001:db8::/32 somegateway */
/* GERT-TODO: this is untested, but should work */
argv_printf (&argv, "%s delete -inet6 %s/%d %s",
ROUTE_PATH,
network,
r6->netbits,
gateway );
argv_msg (D_ROUTE, &argv);
openvpn_execve_check (&argv, es, 0, "ERROR: Solaris route delete -inet6 command failed");
#elif defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY)
argv_printf (&argv, "%s delete -inet6 %s/%d -iface %s",
ROUTE_PATH,
network,
r6->netbits,
device );
argv_msg (D_ROUTE, &argv);
openvpn_execve_check (&argv, es, 0, "ERROR: *BSD route delete -inet6 command failed");
#elif defined(TARGET_DARWIN)
argv_printf (&argv, "%s delete -inet6 %s -prefixlen %d -iface %s",
ROUTE_PATH,
network, r6->netbits, device );
argv_msg (D_ROUTE, &argv);
openvpn_execve_check (&argv, es, 0, "ERROR: *BSD route delete -inet6 command failed");
#elif defined(TARGET_OPENBSD)
argv_printf (&argv, "%s delete -inet6 %s -prefixlen %d %s",
ROUTE_PATH,
network, r6->netbits, gateway );
argv_msg (D_ROUTE, &argv);
openvpn_execve_check (&argv, es, 0, "ERROR: OpenBSD route delete -inet6 command failed");
#elif defined(TARGET_NETBSD)
argv_printf (&argv, "%s delete -inet6 %s/%d %s",
ROUTE_PATH,
network, r6->netbits, gateway );
argv_msg (D_ROUTE, &argv);
openvpn_execve_check (&argv, es, 0, "ERROR: NetBSD route delete -inet6 command failed");
#else
msg (M_FATAL, "Sorry, but I don't know how to do 'route ipv6' commands on this operating system. Try putting your routes in a --route-down 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.flags & RTSA_REMOTE_ENDPOINT))
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;
}
void
get_default_gateway (struct route_gateway_info *rgi)
{
struct gc_arena gc = gc_new ();
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);
DWORD a_index;
const IP_ADAPTER_INFO *ai;
CLEAR(*rgi);
if (row)
{
rgi->gateway.addr = ntohl (row->dwForwardNextHop);
if (rgi->gateway.addr)
{
rgi->flags |= RGI_ADDR_DEFINED;
a_index = adapter_index_of_ip (adapters, rgi->gateway.addr, NULL, &rgi->gateway.netmask);
if (a_index != ~0)
{
rgi->adapter_index = a_index;
rgi->flags |= (RGI_IFACE_DEFINED|RGI_NETMASK_DEFINED);
ai = get_adapter (adapters, a_index);
if (ai)
{
memcpy (rgi->hwaddr, ai->Address, 6);
rgi->flags |= RGI_HWADDR_DEFINED;
}
}
}
}
gc_free (&gc);
}
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, DWORD adapter_index)
{
struct gc_arena gc = gc_new ();
bool ret = false;
DWORD status;
const DWORD if_index = (adapter_index == ~0) ? windows_route_find_if_index (r, tt) : adapter_index;
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->flags & RT_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)
void
get_default_gateway (struct route_gateway_info *rgi)
{
struct gc_arena gc = gc_new ();
int sd = -1;
char best_name[16];
best_name[0] = 0;
CLEAR(*rgi);
/* get default gateway IP addr */
{
FILE *fp = fopen ("/proc/net/route", "r");
if (fp)
{
char line[256];
int count = 0;
unsigned int lowest_metric = ~0;
in_addr_t best_gw = 0;
bool found = false;
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;
unsigned int flags = 0;
char name[16];
name[0] = 0;
const int np = sscanf (line, "%15s\t%x\t%x\t%x\t%*s\t%*s\t%d\t%x",
name,
&net_x,
&gw_x,
&flags,
&metric,
&mask_x);
if (np == 6 && (flags & IFF_UP))
{
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 (!net && !mask && metric < lowest_metric)
{
found = true;
best_gw = gw;
strcpy (best_name, name);
lowest_metric = metric;
}
}
}
++count;
}
fclose (fp);
if (found)
{
rgi->gateway.addr = best_gw;
rgi->flags |= RGI_ADDR_DEFINED;
if (!rgi->gateway.addr && best_name[0])
rgi->flags |= RGI_ON_LINK;
}
}
}
/* scan adapter list */
if (rgi->flags & RGI_ADDR_DEFINED)
{
struct ifreq *ifr, *ifend;
in_addr_t addr, netmask;
struct ifreq ifreq;
struct ifconf ifc;
struct ifreq ifs[20]; /* Maximum number of interfaces to scan */
if ((sd = socket (AF_INET, SOCK_DGRAM, 0)) < 0)
{
msg (M_WARN, "GDG: socket() failed");
goto done;
}
ifc.ifc_len = sizeof (ifs);
ifc.ifc_req = ifs;
if (ioctl (sd, SIOCGIFCONF, &ifc) < 0)
{
msg (M_WARN, "GDG: ioctl(SIOCGIFCONF) failed");
goto done;
}
/* 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)
{
/* get interface addr */
addr = ntohl(((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr);
/* get interface name */
strncpynt (ifreq.ifr_name, ifr->ifr_name, sizeof (ifreq.ifr_name));
/* check that the interface is up */
if (ioctl (sd, SIOCGIFFLAGS, &ifreq) < 0)
continue;
if (!(ifreq.ifr_flags & IFF_UP))
continue;
if (rgi->flags & RGI_ON_LINK)
{
/* check that interface name of current interface
matches interface name of best default route */
if (strcmp(ifreq.ifr_name, best_name))
continue;
#if 0
/* if point-to-point link, use remote addr as route gateway */
if ((ifreq.ifr_flags & IFF_POINTOPOINT) && ioctl (sd, SIOCGIFDSTADDR, &ifreq) >= 0)
{
rgi->gateway.addr = ntohl(((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr);
if (rgi->gateway.addr)
rgi->flags &= ~RGI_ON_LINK;
}
#endif
}
else
{
/* get interface netmask */
if (ioctl (sd, SIOCGIFNETMASK, &ifreq) < 0)
continue;
netmask = ntohl(((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr);
/* check that interface matches default route */
if (((rgi->gateway.addr ^ addr) & netmask) != 0)
continue;
/* save netmask */
rgi->gateway.netmask = netmask;
rgi->flags |= RGI_NETMASK_DEFINED;
}
/* save iface name */
strncpynt (rgi->iface, ifreq.ifr_name, sizeof(rgi->iface));
rgi->flags |= RGI_IFACE_DEFINED;
/* now get the hardware address. */
memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
if (ioctl (sd, SIOCGIFHWADDR, &ifreq) < 0)
{
msg (M_WARN, "GDG: SIOCGIFHWADDR(%s) failed", ifreq.ifr_name);
goto done;
}
memcpy (rgi->hwaddr, &ifreq.ifr_hwaddr.sa_data, 6);
rgi->flags |= RGI_HWADDR_DEFINED;
break;
}
}
}
done:
if (sd >= 0)
close (sd);
gc_free (&gc);
}
#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))
/*
* FIXME -- add support for netmask, hwaddr, and iface
*/
void
get_default_gateway (struct route_gateway_info *rgi)
{
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
CLEAR(*rgi);
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;
}
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;
}
if (gate != NULL )
{
rgi->gateway.addr = ntohl(((struct sockaddr_in *)gate)->sin_addr.s_addr);
rgi->flags |= RGI_ADDR_DEFINED;
gc_free (&gc);
}
else
{
gc_free (&gc);
}
}
#elif defined(TARGET_DARWIN)
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/route.h>
#include <net/if_dl.h>
struct rtmsg {
struct rt_msghdr m_rtm;
char m_space[512];
};
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(uint32_t) - 1))) : sizeof(uint32_t))
#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 max(a,b) ((a) > (b) ? (a) : (b))
void
get_default_gateway (struct route_gateway_info *rgi)
{
struct gc_arena gc = gc_new ();
struct rtmsg m_rtmsg;
int sockfd = -1;
int seq, l, pid, rtm_addrs, i;
struct sockaddr so_dst, so_mask;
char *cp = m_rtmsg.m_space;
struct sockaddr *gate = NULL, *ifp = NULL, *sa;
struct rt_msghdr *rtm_aux;
# define rtm m_rtmsg.m_rtm
CLEAR(*rgi);
/* setup data to send to routing socket */
pid = getpid();
seq = 0;
rtm_addrs = RTA_DST | RTA_NETMASK | RTA_IFP;
bzero(&m_rtmsg, sizeof(m_rtmsg));
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;
/* transact with routing socket */
sockfd = socket(PF_ROUTE, SOCK_RAW, 0);
if (sockfd < 0)
{
msg (M_WARN, "GDG: socket #1 failed");
goto done;
}
if (write(sockfd, (char *)&m_rtmsg, l) < 0)
{
msg (M_WARN, "GDG: problem writing to routing socket");
goto done;
}
do {
l = read(sockfd, (char *)&m_rtmsg, sizeof(m_rtmsg));
} while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
close(sockfd);
sockfd = -1;
/* extract return data from routing socket */
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;
else if (i == RTA_IFP)
ifp = sa;
ADVANCE(cp, sa);
}
}
}
else
goto done;
/* get gateway addr and interface name */
if (gate != NULL )
{
/* get default gateway addr */
rgi->gateway.addr = ntohl(((struct sockaddr_in *)gate)->sin_addr.s_addr);
if (rgi->gateway.addr)
rgi->flags |= RGI_ADDR_DEFINED;
if (ifp)
{
/* get interface name */
const struct sockaddr_dl *adl = (struct sockaddr_dl *) ifp;
int len = adl->sdl_nlen;
if (adl->sdl_nlen && adl->sdl_nlen < sizeof(rgi->iface))
{
memcpy (rgi->iface, adl->sdl_data, adl->sdl_nlen);
rgi->iface[adl->sdl_nlen] = '\0';
rgi->flags |= RGI_IFACE_DEFINED;
}
}
}
/* get netmask of interface that owns default gateway */
if (rgi->flags & RGI_IFACE_DEFINED) {
struct ifreq ifr;
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0)
{
msg (M_WARN, "GDG: socket #2 failed");
goto done;
}
CLEAR(ifr);
ifr.ifr_addr.sa_family = AF_INET;
strncpynt(ifr.ifr_name, rgi->iface, IFNAMSIZ);
if (ioctl(sockfd, SIOCGIFNETMASK, (char *)&ifr) < 0)
{
msg (M_WARN, "GDG: ioctl #1 failed");
goto done;
}
close(sockfd);
sockfd = -1;
rgi->gateway.netmask = ntohl(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr);
rgi->flags |= RGI_NETMASK_DEFINED;
}
/* try to read MAC addr associated with interface that owns default gateway */
if (rgi->flags & RGI_IFACE_DEFINED)
{
struct ifconf ifc;
struct ifreq *ifr;
const int bufsize = 4096;
char *buffer;
buffer = (char *) gc_malloc (bufsize, true, &gc);
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0)
{
msg (M_WARN, "GDG: socket #3 failed");
goto done;
}
ifc.ifc_len = bufsize;
ifc.ifc_buf = buffer;
if (ioctl(sockfd, SIOCGIFCONF, (char *)&ifc) < 0)
{
msg (M_WARN, "GDG: ioctl #2 failed");
goto done;
}
close(sockfd);
sockfd = -1;
for (cp = buffer; cp <= buffer + ifc.ifc_len - sizeof(struct ifreq); )
{
ifr = (struct ifreq *)cp;
const size_t len = sizeof(ifr->ifr_name) + max(sizeof(ifr->ifr_addr), ifr->ifr_addr.sa_len);
if (!ifr->ifr_addr.sa_family)
break;
if (!strncmp(ifr->ifr_name, rgi->iface, IFNAMSIZ))
{
if (ifr->ifr_addr.sa_family == AF_LINK)
{
struct sockaddr_dl *sdl = (struct sockaddr_dl *)&ifr->ifr_addr;
memcpy(rgi->hwaddr, LLADDR(sdl), 6);
rgi->flags |= RGI_HWADDR_DEFINED;
}
}
cp += len;
}
}
done:
if (sockfd >= 0)
close(sockfd);
gc_free (&gc);
}
#undef max
#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))
/*
* FIXME -- add support for netmask, hwaddr, and iface
*/
void
get_default_gateway (struct route_gateway_info *rgi)
{
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
CLEAR(*rgi);
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;
}
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;
}
if (gate != NULL )
{
rgi->gateway.addr = ntohl(((struct sockaddr_in *)gate)->sin_addr.s_addr);
rgi->flags |= RGI_ADDR_DEFINED;
gc_free (&gc);
}
else
{
gc_free (&gc);
}
}
#else
/*
* This is a platform-specific method that returns data about
* the current default gateway. Return data is placed into
* a struct route_gateway_info object provided by caller. The
* implementation should CLEAR the structure before adding
* data to it.
*
* Data returned includes:
* 1. default gateway address (rgi->gateway.addr)
* 2. netmask of interface that owns default gateway
* (rgi->gateway.netmask)
* 3. hardware address (i.e. MAC address) of interface that owns
* default gateway (rgi->hwaddr)
* 4. interface name (or adapter index on Windows) that owns default
* gateway (rgi->iface or rgi->adapter_index)
* 5. an array of additional address/netmask pairs defined by
* interface that owns default gateway (rgi->addrs with length
* given in rgi->n_addrs)
*
* The flags RGI_x_DEFINED may be used to indicate which of the data
* members were successfully returned (set in rgi->flags). All of
* the data members are optional, however certain OpenVPN functionality
* may be disabled by missing items.
*/
void
get_default_gateway (struct route_gateway_info *rgi)
{
CLEAR(*rgi);
}
#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, NULL) == TLA_NONLOCAL && addr != 0 && addr != ~0)
add_bypass_address (rb, 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
/*
* 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, const struct route_gateway_info *rgi)
{
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, const struct route_gateway_info *rgi) /* PLATFORM-SPECIFIC */
{
if (rgi)
{
if (local_route (addr, 0xFFFFFFFF, rgi->gateway.addr, rgi))
return TLA_LOCAL;
else
return TLA_NONLOCAL;
}
return TLA_NOT_IMPLEMENTED;
}
#endif
View Git Blame Copy Permalink