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-rw-r--r--src/openvpn/route.c3298
1 files changed, 3298 insertions, 0 deletions
diff --git a/src/openvpn/route.c b/src/openvpn/route.c
new file mode 100644
index 0000000..8c3d0dc
--- /dev/null
+++ b/src/openvpn/route.c
@@ -0,0 +1,3298 @@
+/*
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#elif defined(_MSC_VER)
+#include "config-msvc.h"
+#endif
+
+#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"
+
+#ifdef WIN32
+#define METRIC_NOT_USED ((DWORD)-1)
+#endif
+
+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 addrinfo **network_list,
+ const struct route_option *ro,
+ const struct route_list *rl)
+{
+ const in_addr_t default_netmask = IPV4_NETMASK_HOST;
+ bool status;
+ int ret;
+ struct in_addr special;
+
+ CLEAR (*r);
+ r->option = ro;
+
+ /* network */
+
+ if (!is_route_parm_defined (ro->network))
+ {
+ goto fail;
+ }
+
+
+ /* get_special_addr replaces specialaddr with a special ip addr
+ like gw. getaddrinfo is called to convert a a addrinfo struct */
+
+ if(get_special_addr (rl, ro->network, &special.s_addr, &status))
+ {
+ special.s_addr = htonl(special.s_addr);
+ ret = openvpn_getaddrinfo(0, inet_ntoa(special), 0, NULL,
+ AF_INET, network_list);
+ }
+ else
+ ret = openvpn_getaddrinfo(GETADDR_RESOLVE | GETADDR_WARN_ON_SIGNAL,
+ ro->network, 0, NULL, AF_INET, network_list);
+
+ status = (ret == 0);
+
+ 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->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 = -1;
+ 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 addrinfo* netlist;
+ struct route r;
+
+ if (!init_route (&r,
+ &netlist,
+ &opt->routes[i],
+ rl))
+ ret = false;
+ else
+ {
+ struct addrinfo* curele;
+ for (curele = netlist; curele; curele = curele->ai_next)
+ {
+ if (j < rl->capacity)
+ {
+ r.network = ntohl(((struct sockaddr_in*)(curele)->ai_addr)->sin_addr.s_addr);
+ 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;
+ }
+ }
+ }
+ freeaddrinfo(netlist);
+ }
+ }
+ 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 >= 0 )
+ {
+ 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],
+ IPV4_NETMASK_HOST,
+ 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],
+ IPV4_NETMASK_HOST,
+ 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,
+ IPV4_NETMASK_HOST,
+ 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,
+ IPV4_NETMASK_HOST,
+ 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 ENABLE_IPROUTE
+ /* FIXME -- add on-link support for ENABLE_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 /*ENABLE_IPROUTE*/
+ argv_msg (D_ROUTE, &argv);
+ status = openvpn_execve_check (&argv, es, 0, "ERROR: Linux route add command failed");
+
+#elif defined (WIN32)
+ {
+ DWORD ai = TUN_ADAPTER_INDEX_INVALID;
+ 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--] &= (0xff << 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;
+
+ bool gateway_needed = false;
+
+ 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)
+ */
+
+ /* On "tun" interface, we never set a gateway if the operating system
+ * can do "route to interface" - it does not add value, as the target
+ * dev already fully qualifies the route destination on point-to-point
+ * interfaces. OTOH, on "tap" interface, we must always set the
+ * gateway unless the route is to be an on-link network
+ */
+ if ( tt->type == DEV_TYPE_TAP &&
+ !(r6->metric_defined && r6->metric == 0 ) )
+ {
+ gateway_needed = true;
+ }
+
+#if defined(TARGET_LINUX)
+#ifdef ENABLE_IPROUTE
+ argv_printf (&argv, "%s -6 route add %s/%d dev %s",
+ iproute_path,
+ network,
+ r6->netbits,
+ device);
+ if (gateway_needed)
+ argv_printf_cat (&argv, "via %s", gateway);
+ if (r6->metric_defined && r6->metric > 0 )
+ 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 (gateway_needed)
+ argv_printf_cat (&argv, "gw %s", gateway);
+ if (r6->metric_defined && r6->metric > 0 )
+ argv_printf_cat (&argv, " metric %d", r6->metric);
+#endif /*ENABLE_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",
+ ROUTE_PATH,
+ network,
+ r6->netbits);
+
+ if (gateway_needed)
+ argv_printf_cat (&argv, "%s", gateway);
+ else
+ argv_printf_cat (&argv, "-iface %s", 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",
+ ROUTE_PATH,
+ network, r6->netbits );
+
+ if (gateway_needed)
+ argv_printf_cat (&argv, "%s", gateway);
+ else
+ argv_printf_cat (&argv, "-iface %s", 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 ENABLE_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 /*ENABLE_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;
+ bool gateway_needed = false;
+
+ 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 we used a gateway on "add route", we also need to specify it on
+ * delete, otherwise some OSes will refuse to delete the route
+ */
+ if ( tt->type == DEV_TYPE_TAP &&
+ !(r6->metric_defined && r6->metric == 0 ) )
+ {
+ gateway_needed = true;
+ }
+
+
+#if defined(TARGET_LINUX)
+#ifdef ENABLE_IPROUTE
+ argv_printf (&argv, "%s -6 route del %s/%d dev %s",
+ iproute_path,
+ network,
+ r6->netbits,
+ device);
+ if (gateway_needed)
+ argv_printf_cat (&argv, "via %s", gateway);
+#else
+ argv_printf (&argv, "%s -A inet6 del %s/%d dev %s",
+ ROUTE_PATH,
+ network,
+ r6->netbits,
+ device);
+ if (gateway_needed)
+ argv_printf_cat (&argv, "gw %s", gateway);
+ if (r6->metric_defined && r6->metric > 0 )
+ argv_printf_cat (&argv, " metric %d", r6->metric);
+#endif /*ENABLE_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",
+ ROUTE_PATH,
+ network,
+ r6->netbits );
+
+ if (gateway_needed)
+ argv_printf_cat (&argv, "%s", gateway);
+ else
+ argv_printf_cat (&argv, "-iface %s", 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",
+ ROUTE_PATH,
+ network, r6->netbits );
+
+ if (gateway_needed)
+ argv_printf_cat (&argv, "%s", gateway);
+ else
+ argv_printf_cat (&argv, "-iface %s", device);
+
+ argv_msg (D_ROUTE, &argv);
+ openvpn_execve_check (&argv, es, 0, "ERROR: MacOS X 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 = MAXDWORD;
+ 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 != TUN_ADAPTER_INDEX_INVALID)
+ {
+ 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 = TUN_ADAPTER_INDEX_INVALID;
+ 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 = TUN_ADAPTER_INDEX_INVALID;
+ }
+ 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 = TUN_ADAPTER_INDEX_INVALID;
+ }
+
+ 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 == TUN_ADAPTER_INDEX_INVALID) ? windows_route_find_if_index (r, tt) : adapter_index;
+
+ if (if_index != TUN_ADAPTER_INDEX_INVALID)
+ {
+ 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 = METRIC_NOT_USED;
+ fr.dwForwardMetric3 = METRIC_NOT_USED;
+ fr.dwForwardMetric4 = METRIC_NOT_USED;
+ fr.dwForwardMetric5 = METRIC_NOT_USED;
+
+ 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 != TUN_ADAPTER_INDEX_INVALID)
+ {
+ 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 = UINT_MAX;
+ 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 != IPV4_NETMASK_HOST)
+ 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