diff options
Diffstat (limited to 'src/openvpn/route.c')
| -rw-r--r-- | src/openvpn/route.c | 1814 |
1 files changed, 1814 insertions, 0 deletions
diff --git a/src/openvpn/route.c b/src/openvpn/route.c new file mode 100644 index 0000000..cbcbf12 --- /dev/null +++ b/src/openvpn/route.c @@ -0,0 +1,1814 @@ +/* + * OpenVPN -- An application to securely tunnel IP networks + * over a single TCP/UDP port, with support for SSL/TLS-based + * session authentication and key exchange, + * packet encryption, packet authentication, and + * packet compression. + * + * Copyright (C) 2002-2005 OpenVPN Solutions LLC <info@openvpn.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program (see the file COPYING included with this + * distribution); if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +/* + * Support routines for adding/deleting network routes. + */ + +#ifdef WIN32 +#include "config-win32.h" +#else +#include "config.h" +#endif + +#include "syshead.h" + +#include "common.h" +#include "error.h" +#include "route.h" +#include "misc.h" +#include "socket.h" +#include "manage.h" + +#include "memdbg.h" + +static void add_route (struct route *r, const struct tuntap *tt, unsigned int flags, const struct env_set *es); +static void delete_route (const struct route *r, const struct tuntap *tt, unsigned int flags, const struct env_set *es); +static bool get_default_gateway (in_addr_t *ret); + +struct route_option_list * +new_route_option_list (struct gc_arena *a) +{ + struct route_option_list *ret; + ALLOC_OBJ_CLEAR_GC (ret, struct route_option_list, a); + return ret; +} + +struct route_list * +new_route_list (struct gc_arena *a) +{ + struct route_list *ret; + ALLOC_OBJ_CLEAR_GC (ret, struct route_list, a); + return ret; +} + +static const char * +route_string (const struct route *r, struct gc_arena *gc) +{ + struct buffer out = alloc_buf_gc (256, gc); + buf_printf (&out, "ROUTE network %s netmask %s gateway %s", + print_in_addr_t (r->network, 0, gc), + print_in_addr_t (r->netmask, 0, gc), + print_in_addr_t (r->gateway, 0, gc) + ); + if (r->metric_defined) + buf_printf (&out, " metric %d", r->metric); + return BSTR (&out); +} + +static bool +is_route_parm_defined (const char *parm) +{ + if (!parm) + return false; + if (!strcmp (parm, "default")) + return false; + return true; +} + +static void +setenv_route_addr (struct env_set *es, const char *key, const in_addr_t addr, int i) +{ + struct gc_arena gc = gc_new (); + struct buffer name = alloc_buf_gc (256, &gc); + if (i >= 0) + buf_printf (&name, "route_%s_%d", key, i); + else + buf_printf (&name, "route_%s", key); + setenv_str (es, BSTR (&name), print_in_addr_t (addr, 0, &gc)); + gc_free (&gc); +} + +static bool +get_special_addr (const struct route_special_addr *spec, + const char *string, + in_addr_t *out, + bool *status) +{ + *status = true; + if (!strcmp (string, "vpn_gateway")) + { + if (spec->remote_endpoint_defined) + *out = spec->remote_endpoint; + else + { + msg (M_INFO, PACKAGE_NAME " ROUTE: vpn_gateway undefined"); + *status = false; + } + return true; + } + else if (!strcmp (string, "net_gateway")) + { + if (spec->net_gateway_defined) + *out = spec->net_gateway; + else + { + msg (M_INFO, PACKAGE_NAME " ROUTE: net_gateway undefined -- unable to get default gateway from system"); + *status = false; + } + return true; + } + else if (!strcmp (string, "remote_host")) + { + if (spec->remote_host_defined) + *out = spec->remote_host; + else + { + msg (M_INFO, PACKAGE_NAME " ROUTE: remote_host undefined"); + *status = false; + } + return true; + } + return false; +} + +static bool +init_route (struct route *r, + const struct route_option *ro, + const struct route_special_addr *spec) +{ + const in_addr_t default_netmask = ~0; + bool status; + + r->option = ro; + r->defined = false; + + /* network */ + + if (!is_route_parm_defined (ro->network)) + { + goto fail; + } + + if (!get_special_addr (spec, ro->network, &r->network, &status)) + { + r->network = getaddr ( + GETADDR_RESOLVE + | GETADDR_HOST_ORDER + | GETADDR_WARN_ON_SIGNAL, + ro->network, + 0, + &status, + NULL); + } + + if (!status) + goto fail; + + /* netmask */ + + if (is_route_parm_defined (ro->netmask)) + { + r->netmask = getaddr ( + GETADDR_HOST_ORDER + | GETADDR_WARN_ON_SIGNAL, + ro->netmask, + 0, + &status, + NULL); + if (!status) + goto fail; + } + else + r->netmask = default_netmask; + + /* gateway */ + + if (is_route_parm_defined (ro->gateway)) + { + if (!get_special_addr (spec, ro->gateway, &r->gateway, &status)) + { + r->gateway = getaddr ( + GETADDR_RESOLVE + | GETADDR_HOST_ORDER + | GETADDR_WARN_ON_SIGNAL, + ro->gateway, + 0, + &status, + NULL); + } + if (!status) + goto fail; + } + else + { + if (spec->remote_endpoint_defined) + r->gateway = spec->remote_endpoint; + else + { + msg (M_WARN, PACKAGE_NAME " ROUTE: " PACKAGE_NAME " needs a gateway parameter for a --route option and no default was specified by either --route-gateway or --ifconfig options"); + goto fail; + } + } + + /* metric */ + + r->metric_defined = false; + r->metric = 0; + if (is_route_parm_defined (ro->metric)) + { + r->metric = atoi (ro->metric); + if (r->metric < 0) + { + msg (M_WARN, PACKAGE_NAME " ROUTE: route metric for network %s (%s) must be >= 0", + ro->network, + ro->metric); + goto fail; + } + r->metric_defined = true; + } + else + { + r->metric = 0; + r->metric_defined = false; + } + + r->defined = true; + + return true; + + fail: + msg (M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve route for host/network: %s", + ro->network); + r->defined = false; + return false; +} + +void +add_route_to_option_list (struct route_option_list *l, + const char *network, + const char *netmask, + const char *gateway, + const char *metric) +{ + struct route_option *ro; + if (l->n >= MAX_ROUTES) + msg (M_FATAL, PACKAGE_NAME " ROUTE: cannot add more than %d routes", + MAX_ROUTES); + ro = &l->routes[l->n]; + ro->network = network; + ro->netmask = netmask; + ro->gateway = gateway; + ro->metric = metric; + ++l->n; +} + +void +clear_route_list (struct route_list *rl) +{ + CLEAR (*rl); +} + +bool +init_route_list (struct route_list *rl, + const struct route_option_list *opt, + const char *remote_endpoint, + in_addr_t remote_host, + struct env_set *es) +{ + struct gc_arena gc = gc_new (); + bool ret = true; + + clear_route_list (rl); + + if (remote_host) + { + rl->spec.remote_host = remote_host; + rl->spec.remote_host_defined = true; + } + + rl->spec.net_gateway_defined = get_default_gateway (&rl->spec.net_gateway); + if (rl->spec.net_gateway_defined) + { + setenv_route_addr (es, "net_gateway", rl->spec.net_gateway, -1); + dmsg (D_ROUTE_DEBUG, "ROUTE: default_gateway=%s", print_in_addr_t (rl->spec.net_gateway, 0, &gc)); + } + else + { + dmsg (D_ROUTE_DEBUG, "ROUTE: default_gateway=UNDEF"); + } + rl->redirect_default_gateway = opt->redirect_default_gateway; + rl->redirect_local = opt->redirect_local; + rl->redirect_def1 = opt->redirect_def1; + + if (is_route_parm_defined (remote_endpoint)) + { + rl->spec.remote_endpoint = getaddr ( + GETADDR_RESOLVE + | GETADDR_HOST_ORDER + | GETADDR_WARN_ON_SIGNAL, + remote_endpoint, + 0, + &rl->spec.remote_endpoint_defined, + NULL); + + if (rl->spec.remote_endpoint_defined) + { + setenv_route_addr (es, "vpn_gateway", rl->spec.remote_endpoint, -1); + } + else + { + msg (M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve default gateway: %s", + remote_endpoint); + ret = false; + } + } + else + rl->spec.remote_endpoint_defined = false; + + ASSERT (opt->n >= 0 && opt->n < MAX_ROUTES); + + /* parse the routes from opt to rl */ + { + int i, j = 0; + for (i = 0; i < opt->n; ++i) + { + if (!init_route (&rl->routes[j], + &opt->routes[i], + &rl->spec)) + ret = false; + else + ++j; + } + rl->n = j; + } + + gc_free (&gc); + return ret; +} + +static void +add_route3 (in_addr_t network, + in_addr_t netmask, + in_addr_t gateway, + const struct tuntap *tt, + unsigned int flags, + const struct env_set *es) +{ + struct route r; + CLEAR (r); + r.defined = true; + r.network = network; + r.netmask = netmask; + r.gateway = gateway; + add_route (&r, tt, flags, es); +} + +static void +del_route3 (in_addr_t network, + in_addr_t netmask, + in_addr_t gateway, + const struct tuntap *tt, + unsigned int flags, + const struct env_set *es) +{ + struct route r; + CLEAR (r); + r.defined = true; + r.network = network; + r.netmask = netmask; + r.gateway = gateway; + delete_route (&r, tt, flags, es); +} + +static void +redirect_default_route_to_vpn (struct route_list *rl, const struct tuntap *tt, unsigned int flags, const struct env_set *es) +{ + const char err[] = "NOTE: unable to redirect default gateway --"; + + if (rl->redirect_default_gateway) + { + if (!rl->spec.remote_endpoint_defined) + { + msg (M_WARN, "%s VPN gateway parameter (--route-gateway or --ifconfig) is missing", err); + } + else if (!rl->spec.net_gateway_defined) + { + msg (M_WARN, "%s Cannot read current default gateway from system", err); + } + else if (!rl->spec.remote_host_defined) + { + msg (M_WARN, "%s Cannot obtain current remote host address", err); + } + else + { + /* route remote host to original default gateway */ + if (!rl->redirect_local) + add_route3 (rl->spec.remote_host, + ~0, + rl->spec.net_gateway, + tt, + flags, + es); + + if (rl->redirect_def1) + { + /* add new default route (1st component) */ + add_route3 (0x00000000, + 0x80000000, + rl->spec.remote_endpoint, + tt, + flags, + es); + + /* add new default route (2nd component) */ + add_route3 (0x80000000, + 0x80000000, + rl->spec.remote_endpoint, + tt, + flags, + es); + } + else + { + /* delete default route */ + del_route3 (0, + 0, + rl->spec.net_gateway, + tt, + flags, + es); + + /* add new default route */ + add_route3 (0, + 0, + rl->spec.remote_endpoint, + tt, + flags, + es); + } + + /* set a flag so we can undo later */ + rl->did_redirect_default_gateway = true; + } + } +} + +static void +undo_redirect_default_route_to_vpn (struct route_list *rl, const struct tuntap *tt, unsigned int flags, const struct env_set *es) +{ + if (rl->did_redirect_default_gateway) + { + /* delete remote host route */ + if (!rl->redirect_local) + del_route3 (rl->spec.remote_host, + ~0, + rl->spec.net_gateway, + tt, + flags, + es); + + if (rl->redirect_def1) + { + /* delete default route (1st component) */ + del_route3 (0x00000000, + 0x80000000, + rl->spec.remote_endpoint, + tt, + flags, + es); + + /* delete default route (2nd component) */ + del_route3 (0x80000000, + 0x80000000, + rl->spec.remote_endpoint, + tt, + flags, + es); + } + else + { + /* delete default route */ + del_route3 (0, + 0, + rl->spec.remote_endpoint, + tt, + flags, + es); + + /* restore original default route */ + add_route3 (0, + 0, + rl->spec.net_gateway, + tt, + flags, + es); + } + + rl->did_redirect_default_gateway = false; + } +} + +void +add_routes (struct route_list *rl, const struct tuntap *tt, unsigned int flags, const struct env_set *es) +{ + redirect_default_route_to_vpn (rl, tt, flags, es); + if (!rl->routes_added) + { + int i; + +#ifdef ENABLE_MANAGEMENT + if (management && rl->n) + { + management_set_state (management, + OPENVPN_STATE_ADD_ROUTES, + NULL, + 0); + } +#endif + + for (i = 0; i < rl->n; ++i) + { + if (flags & ROUTE_DELETE_FIRST) + delete_route (&rl->routes[i], tt, flags, es); + add_route (&rl->routes[i], tt, flags, es); + } + rl->routes_added = true; + } +} + +void +delete_routes (struct route_list *rl, const struct tuntap *tt, unsigned int flags, const struct env_set *es) +{ + if (rl->routes_added) + { + int i; + for (i = rl->n - 1; i >= 0; --i) + { + const struct route *r = &rl->routes[i]; + delete_route (r, tt, flags, es); + } + rl->routes_added = false; + } + undo_redirect_default_route_to_vpn (rl, tt, flags, es); + + CLEAR (*rl); +} + +#ifdef ENABLE_DEBUG + +static const char * +show_opt (const char *option) +{ + if (!option) + return "nil"; + else + return option; +} + +static void +print_route_option (const struct route_option *ro, int level) +{ + msg (level, " route %s/%s/%s/%s", + show_opt (ro->network), + show_opt (ro->netmask), + show_opt (ro->gateway), + show_opt (ro->metric)); +} + +void +print_route_options (const struct route_option_list *rol, + int level) +{ + int i; + if (rol->redirect_default_gateway) + msg (level, " [redirect_default_gateway local=%d]", + rol->redirect_local); + for (i = 0; i < rol->n; ++i) + print_route_option (&rol->routes[i], level); +} + +#endif + +static void +print_route (const struct route *r, int level) +{ + struct gc_arena gc = gc_new (); + if (r->defined) + msg (level, "%s", route_string (r, &gc)); + gc_free (&gc); +} + +void +print_routes (const struct route_list *rl, int level) +{ + int i; + for (i = 0; i < rl->n; ++i) + print_route (&rl->routes[i], level); +} + +static void +setenv_route (struct env_set *es, const struct route *r, int i) +{ + struct gc_arena gc = gc_new (); + if (r->defined) + { + setenv_route_addr (es, "network", r->network, i); + setenv_route_addr (es, "netmask", r->netmask, i); + setenv_route_addr (es, "gateway", r->gateway, i); + + if (r->metric_defined) + { + struct buffer name = alloc_buf_gc (256, &gc); + buf_printf (&name, "route_metric_%d", i); + setenv_int (es, BSTR (&name), r->metric); + } + } + gc_free (&gc); +} + +void +setenv_routes (struct env_set *es, const struct route_list *rl) +{ + int i; + for (i = 0; i < rl->n; ++i) + setenv_route (es, &rl->routes[i], i + 1); +} + +static void +add_route (struct route *r, const struct tuntap *tt, unsigned int flags, const struct env_set *es) +{ + struct gc_arena gc; + struct buffer buf; + const char *network; + const char *netmask; + const char *gateway; + bool status = false; + + if (!r->defined) + return; + + gc_init (&gc); + buf = alloc_buf_gc (256, &gc); + + network = print_in_addr_t (r->network, 0, &gc); + netmask = print_in_addr_t (r->netmask, 0, &gc); + gateway = print_in_addr_t (r->gateway, 0, &gc); + + /* + * Filter out routes which are essentially no-ops + */ + if (r->network == r->gateway && r->netmask == 0xFFFFFFFF) + { + msg (M_INFO, PACKAGE_NAME " ROUTE: omitted no-op route: %s/%s -> %s", + network, netmask, gateway); + goto done; + } + +#if defined(TARGET_LINUX) +#ifdef CONFIG_FEATURE_IPROUTE + buf_printf (&buf, IPROUTE_PATH " route add %s/%d via %s", + network, + count_netmask_bits(netmask), + gateway); + if (r->metric_defined) + buf_printf (&buf, " metric %d", r->metric); + +#else + buf_printf (&buf, ROUTE_PATH " add -net %s netmask %s gw %s", + network, + netmask, + gateway); + if (r->metric_defined) + buf_printf (&buf, " metric %d", r->metric); +#endif /*CONFIG_FEATURE_IPROUTE*/ + msg (D_ROUTE, "%s", BSTR (&buf)); + status = system_check (BSTR (&buf), es, 0, "ERROR: Linux route add command failed"); + +#elif defined (WIN32) + + buf_printf (&buf, ROUTE_PATH " ADD %s MASK %s %s", + network, + netmask, + gateway); + if (r->metric_defined) + buf_printf (&buf, " METRIC %d", r->metric); + + msg (D_ROUTE, "%s", BSTR (&buf)); + + if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_IPAPI) + { + status = add_route_ipapi (r, tt); + msg (D_ROUTE, "Route addition via IPAPI %s", status ? "succeeded" : "failed"); + } + else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_EXE) + { + netcmd_semaphore_lock (); + status = system_check (BSTR (&buf), es, 0, "ERROR: Windows route add command failed"); + netcmd_semaphore_release (); + } + else + { + ASSERT (0); + } + +#elif defined (TARGET_SOLARIS) + + /* example: route add 192.0.2.32 -netmask 255.255.255.224 somegateway */ + + buf_printf (&buf, ROUTE_PATH " add"); + +#if 0 + if (r->metric_defined) + buf_printf (&buf, " -rtt %d", r->metric); +#endif + + buf_printf (&buf, " %s -netmask %s %s", + network, + netmask, + gateway); + + msg (D_ROUTE, "%s", BSTR (&buf)); + status = system_check (BSTR (&buf), es, 0, "ERROR: Solaris route add command failed"); + +#elif defined(TARGET_FREEBSD) + + buf_printf (&buf, ROUTE_PATH " add"); + +#if 0 + if (r->metric_defined) + buf_printf (&buf, " -rtt %d", r->metric); +#endif + + buf_printf (&buf, " -net %s %s %s", + network, + gateway, + netmask); + + msg (D_ROUTE, "%s", BSTR (&buf)); + status = system_check (BSTR (&buf), es, 0, "ERROR: FreeBSD route add command failed"); + +#elif defined(TARGET_DARWIN) + + buf_printf (&buf, ROUTE_PATH " add"); + +#if 0 + if (r->metric_defined) + buf_printf (&buf, " -rtt %d", r->metric); +#endif + + buf_printf (&buf, " -net %s %s %s", + network, + gateway, + netmask); + + msg (D_ROUTE, "%s", BSTR (&buf)); + status = system_check (BSTR (&buf), es, 0, "ERROR: OS X route add command failed"); + +#elif defined(TARGET_OPENBSD) || defined(TARGET_NETBSD) + + buf_printf (&buf, ROUTE_PATH " add"); + +#if 0 + if (r->metric_defined) + buf_printf (&buf, " -rtt %d", r->metric); +#endif + + buf_printf (&buf, " -net %s %s -netmask %s", + network, + gateway, + netmask); + + msg (D_ROUTE, "%s", BSTR (&buf)); + status = system_check (BSTR (&buf), es, 0, "ERROR: OpenBSD/NetBSD route add command failed"); + +#else + msg (M_FATAL, "Sorry, but I don't know how to do 'route' commands on this operating system. Try putting your routes in a --route-up script"); +#endif + + done: + r->defined = status; + gc_free (&gc); +} + +static void +delete_route (const struct route *r, const struct tuntap *tt, unsigned int flags, const struct env_set *es) +{ + struct gc_arena gc; + struct buffer buf; + const char *network; + const char *netmask; + const char *gateway; + + if (!r->defined) + return; + + gc_init (&gc); + + buf = alloc_buf_gc (256, &gc); + network = print_in_addr_t (r->network, 0, &gc); + netmask = print_in_addr_t (r->netmask, 0, &gc); + gateway = print_in_addr_t (r->gateway, 0, &gc); + +#if defined(TARGET_LINUX) +#ifdef CONFIG_FEATURE_IPROUTE + buf_printf (&buf, IPROUTE_PATH " route del %s/%d", + network, + count_netmask_bits(netmask)); +#else + + buf_printf (&buf, ROUTE_PATH " del -net %s netmask %s", + network, + netmask); +#endif /*CONFIG_FEATURE_IPROUTE*/ + if (r->metric_defined) + buf_printf (&buf, " metric %d", r->metric); + msg (D_ROUTE, "%s", BSTR (&buf)); + system_check (BSTR (&buf), es, 0, "ERROR: Linux route delete command failed"); + +#elif defined (WIN32) + + buf_printf (&buf, ROUTE_PATH " DELETE %s MASK %s %s", + network, + netmask, + gateway); + + msg (D_ROUTE, "%s", BSTR (&buf)); + + if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_IPAPI) + { + const bool status = del_route_ipapi (r, tt); + msg (D_ROUTE, "Route deletion via IPAPI %s", status ? "succeeded" : "failed"); + } + else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_EXE) + { + netcmd_semaphore_lock (); + system_check (BSTR (&buf), es, 0, "ERROR: Windows route delete command failed"); + netcmd_semaphore_release (); + } + else + { + ASSERT (0); + } + +#elif defined (TARGET_SOLARIS) + + buf_printf (&buf, ROUTE_PATH " delete %s -netmask %s %s", + network, + netmask, + gateway); + + msg (D_ROUTE, "%s", BSTR (&buf)); + system_check (BSTR (&buf), es, 0, "ERROR: Solaris route delete command failed"); + +#elif defined(TARGET_FREEBSD) + + buf_printf (&buf, ROUTE_PATH " delete -net %s %s %s", + network, + gateway, + netmask); + + msg (D_ROUTE, "%s", BSTR (&buf)); + system_check (BSTR (&buf), es, 0, "ERROR: FreeBSD route delete command failed"); + +#elif defined(TARGET_DARWIN) + + buf_printf (&buf, ROUTE_PATH " delete -net %s %s %s", + network, + gateway, + netmask); + + msg (D_ROUTE, "%s", BSTR (&buf)); + system_check (BSTR (&buf), es, 0, "ERROR: OS X route delete command failed"); + +#elif defined(TARGET_OPENBSD) || defined(TARGET_NETBSD) + + buf_printf (&buf, ROUTE_PATH " delete -net %s %s -netmask %s", + network, + gateway, + netmask); + + msg (D_ROUTE, "%s", BSTR (&buf)); + system_check (BSTR (&buf), es, 0, "ERROR: OpenBSD/NetBSD route delete command failed"); + +#else + msg (M_FATAL, "Sorry, but I don't know how to do 'route' commands on this operating system. Try putting your routes in a --route-up script"); +#endif + + gc_free (&gc); +} + +/* + * The --redirect-gateway option requires OS-specific code below + * to get the current default gateway. + */ + +#if defined(WIN32) + +static const MIB_IPFORWARDTABLE * +get_windows_routing_table (struct gc_arena *gc) +{ + ULONG size = 0; + PMIB_IPFORWARDTABLE rt = NULL; + DWORD status; + + status = GetIpForwardTable (NULL, &size, TRUE); + if (status == ERROR_INSUFFICIENT_BUFFER) + { + rt = (PMIB_IPFORWARDTABLE) gc_malloc (size, false, gc); + status = GetIpForwardTable (rt, &size, TRUE); + if (status != NO_ERROR) + { + msg (D_ROUTE, "NOTE: GetIpForwardTable returned error: %s (code=%u)", + strerror_win32 (status, gc), + (unsigned int)status); + rt = NULL; + } + } + return rt; +} + +static int +test_route (const IP_ADAPTER_INFO *adapters, + const in_addr_t gateway, + DWORD *index) +{ + int count = 0; + DWORD i = adapter_index_of_ip (adapters, gateway, &count); + if (index) + *index = i; + return count; +} + +static void +test_route_helper (bool *ret, + int *count, + int *good, + int *ambig, + const IP_ADAPTER_INFO *adapters, + const in_addr_t gateway) +{ + int c; + + ++*count; + c = test_route (adapters, gateway, NULL); + if (c == 0) + *ret = false; + else + ++*good; + if (c > 1) + ++*ambig; +} + +/* + * If we tried to add routes now, would we succeed? + */ +bool +test_routes (const struct route_list *rl, const struct tuntap *tt) +{ + struct gc_arena gc = gc_new (); + const IP_ADAPTER_INFO *adapters = get_adapter_info_list (&gc); + bool ret = false; + int count = 0; + int good = 0; + int ambig = 0; + bool adapter_up = false; + + if (is_adapter_up (tt, adapters)) + { + ret = true; + adapter_up = true; + + if (rl) + { + int i; + for (i = 0; i < rl->n; ++i) + test_route_helper (&ret, &count, &good, &ambig, adapters, rl->routes[i].gateway); + + if (rl->redirect_default_gateway && rl->spec.remote_endpoint_defined) + test_route_helper (&ret, &count, &good, &ambig, adapters, rl->spec.remote_endpoint); + } + } + + msg (D_ROUTE, "TEST ROUTES: %d/%d succeeded len=%d ret=%d a=%d u/d=%s", + good, + count, + rl ? rl->n : -1, + (int)ret, + ambig, + adapter_up ? "up" : "down"); + + gc_free (&gc); + return ret; +} + +static bool +get_default_gateway (in_addr_t *gateway) +{ + struct gc_arena gc = gc_new (); + int i; + const MIB_IPFORWARDTABLE *routes = get_windows_routing_table (&gc); + DWORD lowest_metric = ~0; + in_addr_t ret = 0; + int best = -1; + + if (!routes) + goto done; + + for (i = 0; i < routes->dwNumEntries; ++i) + { + const MIB_IPFORWARDROW *row = &routes->table[i]; + const in_addr_t net = ntohl (row->dwForwardDest); + const in_addr_t mask = ntohl (row->dwForwardMask); + const in_addr_t gw = ntohl (row->dwForwardNextHop); + const DWORD metric = row->dwForwardMetric1; + + msg (D_ROUTE_DEBUG, "GDG: route[%d] %s %s %s m=%u", + i, + print_in_addr_t ((in_addr_t) net, 0, &gc), + print_in_addr_t ((in_addr_t) mask, 0, &gc), + print_in_addr_t ((in_addr_t) gw, 0, &gc), + (unsigned int)metric); + + if (!net && !mask && metric < lowest_metric) + { + ret = gw; + lowest_metric = metric; + best = i; + } + } + + done: + gc_free (&gc); + + if (ret) + { + dmsg (D_ROUTE_DEBUG, "GDGR: best=%d lm=%u", best, (unsigned int)lowest_metric); + *gateway = ret; + return true; + } + else + return false; +} + +static DWORD +windows_route_find_if_index (const struct route *r, const struct tuntap *tt) +{ + struct gc_arena gc = gc_new (); + DWORD ret = ~0; + int count = 0; + const IP_ADAPTER_INFO *adapters = get_adapter_info_list (&gc); + const IP_ADAPTER_INFO *tun_adapter = get_tun_adapter (tt, adapters); + bool on_tun = false; + + /* first test on tun interface */ + if (is_ip_in_adapter_subnet (tun_adapter, r->gateway, NULL)) + { + ret = tun_adapter->Index; + count = 1; + on_tun = true; + } + else /* test on other interfaces */ + { + count = test_route (adapters, r->gateway, &ret); + } + + if (count == 0) + { + msg (M_WARN, "Warning: route gateway is not reachable on any active network adapters: %s", + print_in_addr_t (r->gateway, 0, &gc)); + ret = ~0; + } + else if (count > 1) + { + msg (M_WARN, "Warning: route gateway is ambiguous: %s (%d matches)", + print_in_addr_t (r->gateway, 0, &gc), + count); + ret = ~0; + } + + dmsg (D_ROUTE_DEBUG, "DEBUG: route find if: on_tun=%d count=%d index=%d", + on_tun, + count, + (int)ret); + + gc_free (&gc); + return ret; +} + +bool +add_route_ipapi (const struct route *r, const struct tuntap *tt) +{ + struct gc_arena gc = gc_new (); + bool ret = false; + DWORD status; + const DWORD if_index = windows_route_find_if_index (r, tt); + + if (if_index != ~0) + { + MIB_IPFORWARDROW fr; + CLEAR (fr); + fr.dwForwardDest = htonl (r->network); + fr.dwForwardMask = htonl (r->netmask); + fr.dwForwardPolicy = 0; + fr.dwForwardNextHop = htonl (r->gateway); + fr.dwForwardIfIndex = if_index; + fr.dwForwardType = 4; /* the next hop is not the final dest */ + fr.dwForwardProto = 3; /* PROTO_IP_NETMGMT */ + fr.dwForwardAge = 0; + fr.dwForwardNextHopAS = 0; + fr.dwForwardMetric1 = r->metric_defined ? r->metric : 1; + fr.dwForwardMetric2 = ~0; + fr.dwForwardMetric3 = ~0; + fr.dwForwardMetric4 = ~0; + fr.dwForwardMetric5 = ~0; + + if ((r->network & r->netmask) != r->network) + msg (M_WARN, "Warning: address %s is not a network address in relation to netmask %s", + print_in_addr_t (r->network, 0, &gc), + print_in_addr_t (r->netmask, 0, &gc)); + + status = CreateIpForwardEntry (&fr); + + if (status == NO_ERROR) + ret = true; + else + { + /* failed, try a different forward type (--redirect-gateway over RRAS seems to need this) */ + fr.dwForwardType = 3; /* the next hop is the final dest */ + + status = CreateIpForwardEntry (&fr); + + if (status == NO_ERROR) + ret = true; + else + msg (M_WARN, "ROUTE: route addition failed using CreateIpForwardEntry: %s [if_index=%u]", + strerror_win32 (status, &gc), + (unsigned int)if_index); + } + } + + gc_free (&gc); + return ret; +} + +bool +del_route_ipapi (const struct route *r, const struct tuntap *tt) +{ + struct gc_arena gc = gc_new (); + bool ret = false; + DWORD status; + const DWORD if_index = windows_route_find_if_index (r, tt); + + if (if_index != ~0) + { + MIB_IPFORWARDROW fr; + CLEAR (fr); + + fr.dwForwardDest = htonl (r->network); + fr.dwForwardMask = htonl (r->netmask); + fr.dwForwardPolicy = 0; + fr.dwForwardNextHop = htonl (r->gateway); + fr.dwForwardIfIndex = if_index; + + status = DeleteIpForwardEntry (&fr); + + if (status == NO_ERROR) + ret = true; + else + msg (M_WARN, "ROUTE: route deletion failed using DeleteIpForwardEntry: %s", + strerror_win32 (status, &gc)); + } + + gc_free (&gc); + return ret; +} + +static const char * +format_route_entry (const MIB_IPFORWARDROW *r, struct gc_arena *gc) +{ + struct buffer out = alloc_buf_gc (256, gc); + buf_printf (&out, "%s %s %s p=%d i=%d t=%d pr=%d a=%d h=%d m=%d/%d/%d/%d/%d", + print_in_addr_t (r->dwForwardDest, IA_NET_ORDER, gc), + print_in_addr_t (r->dwForwardMask, IA_NET_ORDER, gc), + print_in_addr_t (r->dwForwardNextHop, IA_NET_ORDER, gc), + (int)r->dwForwardPolicy, + (int)r->dwForwardIfIndex, + (int)r->dwForwardType, + (int)r->dwForwardProto, + (int)r->dwForwardAge, + (int)r->dwForwardNextHopAS, + (int)r->dwForwardMetric1, + (int)r->dwForwardMetric2, + (int)r->dwForwardMetric3, + (int)r->dwForwardMetric4, + (int)r->dwForwardMetric5); + return BSTR (&out); +} + +/* + * Show current routing table + */ +void +show_routes (int msglev) +{ + struct gc_arena gc = gc_new (); + int i; + + const MIB_IPFORWARDTABLE *rt = get_windows_routing_table (&gc); + + msg (msglev, "SYSTEM ROUTING TABLE"); + if (rt) + { + for (i = 0; i < rt->dwNumEntries; ++i) + { + msg (msglev, "%s", format_route_entry (&rt->table[i], &gc)); + } + } + gc_free (&gc); +} + +#elif defined(TARGET_LINUX) + +static bool +get_default_gateway (in_addr_t *gateway) +{ + struct gc_arena gc = gc_new (); + bool ret = false; + FILE *fp = fopen ("/proc/net/route", "r"); + if (fp) + { + char line[256]; + int count = 0; + int best_count = 0; + unsigned int lowest_metric = ~0; + in_addr_t best_gw = 0; + while (fgets (line, sizeof (line), fp) != NULL) + { + if (count) + { + unsigned int net_x = 0; + unsigned int mask_x = 0; + unsigned int gw_x = 0; + unsigned int metric = 0; + const int np = sscanf (line, "%*s\t%x\t%x\t%*s\t%*s\t%*s\t%d\t%x", + &net_x, + &gw_x, + &metric, + &mask_x); + if (np == 4) + { + const in_addr_t net = ntohl (net_x); + const in_addr_t mask = ntohl (mask_x); + const in_addr_t gw = ntohl (gw_x); + + dmsg (D_ROUTE_DEBUG, "GDG: route[%d] %s/%s/%s m=%u", + count, + print_in_addr_t ((in_addr_t) net, 0, &gc), + print_in_addr_t ((in_addr_t) mask, 0, &gc), + print_in_addr_t ((in_addr_t) gw, 0, &gc), + metric); + + if (!net && !mask && metric < lowest_metric) + { + best_gw = gw; + lowest_metric = metric; + best_count = count; + } + } + } + ++count; + } + fclose (fp); + + if (best_gw) + { + *gateway = best_gw; + ret = true; + } + + dmsg (D_ROUTE_DEBUG, "GDG: best=%s[%d] lm=%u", + print_in_addr_t ((in_addr_t) best_gw, 0, &gc), + best_count, + (unsigned int)lowest_metric); + } + + gc_free (&gc); + return ret; +} + +#elif defined(TARGET_FREEBSD) + +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> + +/* all of this is taken from <net/route.h> in FreeBSD */ +#define RTA_DST 0x1 +#define RTA_GATEWAY 0x2 +#define RTA_NETMASK 0x4 + +#define RTM_GET 0x4 +#define RTM_VERSION 5 + +#define RTF_UP 0x1 +#define RTF_GATEWAY 0x2 + +/* + * These numbers are used by reliable protocols for determining + * retransmission behavior and are included in the routing structure. + */ +struct rt_metrics { + u_long rmx_locks; /* Kernel must leave these values alone */ + u_long rmx_mtu; /* MTU for this path */ + u_long rmx_hopcount; /* max hops expected */ + u_long rmx_expire; /* lifetime for route, e.g. redirect */ + u_long rmx_recvpipe; /* inbound delay-bandwidth product */ + u_long rmx_sendpipe; /* outbound delay-bandwidth product */ + u_long rmx_ssthresh; /* outbound gateway buffer limit */ + u_long rmx_rtt; /* estimated round trip time */ + u_long rmx_rttvar; /* estimated rtt variance */ + u_long rmx_pksent; /* packets sent using this route */ + u_long rmx_filler[4]; /* will be used for T/TCP later */ +}; + +/* + * Structures for routing messages. + */ +struct rt_msghdr { + u_short rtm_msglen; /* to skip over non-understood messages */ + u_char rtm_version; /* future binary compatibility */ + u_char rtm_type; /* message type */ + u_short rtm_index; /* index for associated ifp */ + int rtm_flags; /* flags, incl. kern & message, e.g. DONE */ + int rtm_addrs; /* bitmask identifying sockaddrs in msg */ + pid_t rtm_pid; /* identify sender */ + int rtm_seq; /* for sender to identify action */ + int rtm_errno; /* why failed */ + int rtm_use; /* from rtentry */ + u_long rtm_inits; /* which metrics we are initializing */ + struct rt_metrics rtm_rmx; /* metrics themselves */ +}; + +struct { + struct rt_msghdr m_rtm; + char m_space[512]; +} m_rtmsg; + +#define ROUNDUP(a) \ + ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) + +static bool +get_default_gateway (in_addr_t *ret) +{ + struct gc_arena gc = gc_new (); + int s, seq, l, pid, rtm_addrs, i; + struct sockaddr so_dst, so_mask; + char *cp = m_rtmsg.m_space; + struct sockaddr *gate = NULL, *sa; + struct rt_msghdr *rtm_aux; + +#define NEXTADDR(w, u) \ + if (rtm_addrs & (w)) {\ + l = ROUNDUP(u.sa_len); memmove(cp, &(u), l); cp += l;\ + } + +#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) + +#define rtm m_rtmsg.m_rtm + + pid = getpid(); + seq = 0; + rtm_addrs = RTA_DST | RTA_NETMASK; + + bzero(&so_dst, sizeof(so_dst)); + bzero(&so_mask, sizeof(so_mask)); + bzero(&rtm, sizeof(struct rt_msghdr)); + + rtm.rtm_type = RTM_GET; + rtm.rtm_flags = RTF_UP | RTF_GATEWAY; + rtm.rtm_version = RTM_VERSION; + rtm.rtm_seq = ++seq; + rtm.rtm_addrs = rtm_addrs; + + so_dst.sa_family = AF_INET; + so_dst.sa_len = sizeof(struct sockaddr_in); + so_mask.sa_family = AF_INET; + so_mask.sa_len = sizeof(struct sockaddr_in); + + NEXTADDR(RTA_DST, so_dst); + NEXTADDR(RTA_NETMASK, so_mask); + + rtm.rtm_msglen = l = cp - (char *)&m_rtmsg; + + s = socket(PF_ROUTE, SOCK_RAW, 0); + + if (write(s, (char *)&m_rtmsg, l) < 0) + { + warn("writing to routing socket"); + gc_free (&gc); + close(s); + return false; + } + + do { + l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg)); + } while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid)); + + close(s); + + rtm_aux = &rtm; + + cp = ((char *)(rtm_aux + 1)); + if (rtm_aux->rtm_addrs) { + for (i = 1; i; i <<= 1) + if (i & rtm_aux->rtm_addrs) { + sa = (struct sockaddr *)cp; + if (i == RTA_GATEWAY ) + gate = sa; + ADVANCE(cp, sa); + } + } + else + { + gc_free (&gc); + return false; + } + + + if (gate != NULL ) + { + *ret = ntohl(((struct sockaddr_in *)gate)->sin_addr.s_addr); +#if 1 + msg (M_INFO, "gw %s", + print_in_addr_t ((in_addr_t) *ret, 0, &gc)); +#endif + + gc_free (&gc); + return true; + } + else + { + gc_free (&gc); + return false; + } +} + +#elif defined(TARGET_DARWIN) + +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> + +/* all of this is taken from <net/route.h> in Darwin */ +#define RTA_DST 0x1 +#define RTA_GATEWAY 0x2 +#define RTA_NETMASK 0x4 + +#define RTM_GET 0x4 +#define RTM_VERSION 5 + +#define RTF_UP 0x1 +#define RTF_GATEWAY 0x2 + +/* + * These numbers are used by reliable protocols for determining + * retransmission behavior and are included in the routing structure. + */ +struct rt_metrics { + u_long rmx_locks; /* Kernel must leave these values alone */ + u_long rmx_mtu; /* MTU for this path */ + u_long rmx_hopcount; /* max hops expected */ + u_long rmx_expire; /* lifetime for route, e.g. redirect */ + u_long rmx_recvpipe; /* inbound delay-bandwidth product */ + u_long rmx_sendpipe; /* outbound delay-bandwidth product */ + u_long rmx_ssthresh; /* outbound gateway buffer limit */ + u_long rmx_rtt; /* estimated round trip time */ + u_long rmx_rttvar; /* estimated rtt variance */ + u_long rmx_pksent; /* packets sent using this route */ + u_long rmx_filler[4]; /* will be used for T/TCP later */ +}; + +/* + * Structures for routing messages. + */ +struct rt_msghdr { + u_short rtm_msglen; /* to skip over non-understood messages */ + u_char rtm_version; /* future binary compatibility */ + u_char rtm_type; /* message type */ + u_short rtm_index; /* index for associated ifp */ + int rtm_flags; /* flags, incl. kern & message, e.g. DONE */ + int rtm_addrs; /* bitmask identifying sockaddrs in msg */ + pid_t rtm_pid; /* identify sender */ + int rtm_seq; /* for sender to identify action */ + int rtm_errno; /* why failed */ + int rtm_use; /* from rtentry */ + u_long rtm_inits; /* which metrics we are initializing */ + struct rt_metrics rtm_rmx; /* metrics themselves */ +}; + +struct { + struct rt_msghdr m_rtm; + char m_space[512]; +} m_rtmsg; + +#define ROUNDUP(a) \ + ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) + +static bool +get_default_gateway (in_addr_t *ret) +{ + struct gc_arena gc = gc_new (); + int s, seq, l, pid, rtm_addrs, i; + struct sockaddr so_dst, so_mask; + char *cp = m_rtmsg.m_space; + struct sockaddr *gate = NULL, *sa; + struct rt_msghdr *rtm_aux; + +#define NEXTADDR(w, u) \ + if (rtm_addrs & (w)) {\ + l = ROUNDUP(u.sa_len); memmove(cp, &(u), l); cp += l;\ + } + +#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) + +#define rtm m_rtmsg.m_rtm + + pid = getpid(); + seq = 0; + rtm_addrs = RTA_DST | RTA_NETMASK; + + bzero(&so_dst, sizeof(so_dst)); + bzero(&so_mask, sizeof(so_mask)); + bzero(&rtm, sizeof(struct rt_msghdr)); + + rtm.rtm_type = RTM_GET; + rtm.rtm_flags = RTF_UP | RTF_GATEWAY; + rtm.rtm_version = RTM_VERSION; + rtm.rtm_seq = ++seq; + rtm.rtm_addrs = rtm_addrs; + + so_dst.sa_family = AF_INET; + so_dst.sa_len = sizeof(struct sockaddr_in); + so_mask.sa_family = AF_INET; + so_mask.sa_len = sizeof(struct sockaddr_in); + + NEXTADDR(RTA_DST, so_dst); + NEXTADDR(RTA_NETMASK, so_mask); + + rtm.rtm_msglen = l = cp - (char *)&m_rtmsg; + + s = socket(PF_ROUTE, SOCK_RAW, 0); + + if (write(s, (char *)&m_rtmsg, l) < 0) + { + msg (M_WARN, "ROUTE: problem writing to routing socket"); + gc_free (&gc); + close(s); + return false; + } + + do { + l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg)); + } while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid)); + + close(s); + + rtm_aux = &rtm; + + cp = ((char *)(rtm_aux + 1)); + if (rtm_aux->rtm_addrs) { + for (i = 1; i; i <<= 1) + if (i & rtm_aux->rtm_addrs) { + sa = (struct sockaddr *)cp; + if (i == RTA_GATEWAY ) + gate = sa; + ADVANCE(cp, sa); + } + } + else + { + gc_free (&gc); + return false; + } + + + if (gate != NULL ) + { + *ret = ntohl(((struct sockaddr_in *)gate)->sin_addr.s_addr); +#if 1 + msg (M_INFO, "gw %s", + print_in_addr_t ((in_addr_t) *ret, 0, &gc)); +#endif + + gc_free (&gc); + return true; + } + else + { + gc_free (&gc); + return false; + } +} + +#elif defined(TARGET_OPENBSD) || defined(TARGET_NETBSD) + +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> + +/* all of this is taken from <net/route.h> in OpenBSD 3.6 */ +#define RTA_DST 0x1 /* destination sockaddr present */ +#define RTA_GATEWAY 0x2 /* gateway sockaddr present */ +#define RTA_NETMASK 0x4 /* netmask sockaddr present */ + +#define RTM_GET 0x4 /* Report Metrics */ + +#define RTM_VERSION 3 /* Up the ante and ignore older versions */ + +#define RTF_UP 0x1 /* route usable */ +#define RTF_GATEWAY 0x2 /* destination is a gateway */ + +/* + * Huge version for userland compatibility. + */ +struct rt_metrics { + u_long rmx_locks; /* Kernel must leave these values alone */ + u_long rmx_mtu; /* MTU for this path */ + u_long rmx_hopcount; /* max hops expected */ + u_long rmx_expire; /* lifetime for route, e.g. redirect */ + u_long rmx_recvpipe; /* inbound delay-bandwidth product */ + u_long rmx_sendpipe; /* outbound delay-bandwidth product */ + u_long rmx_ssthresh; /* outbound gateway buffer limit */ + u_long rmx_rtt; /* estimated round trip time */ + u_long rmx_rttvar; /* estimated rtt variance */ + u_long rmx_pksent; /* packets sent using this route */ +}; + +/* + * Structures for routing messages. + */ +struct rt_msghdr { + u_short rtm_msglen; /* to skip over non-understood messages */ + u_char rtm_version; /* future binary compatibility */ + u_char rtm_type; /* message type */ + u_short rtm_index; /* index for associated ifp */ + int rtm_flags; /* flags, incl. kern & message, e.g. DONE */ + int rtm_addrs; /* bitmask identifying sockaddrs in msg */ + pid_t rtm_pid; /* identify sender */ + int rtm_seq; /* for sender to identify action */ + int rtm_errno; /* why failed */ + int rtm_use; /* from rtentry */ + u_long rtm_inits; /* which metrics we are initializing */ + struct rt_metrics rtm_rmx; /* metrics themselves */ +}; + +struct { + struct rt_msghdr m_rtm; + char m_space[512]; +} m_rtmsg; + +#define ROUNDUP(a) \ + ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) + +static bool +get_default_gateway (in_addr_t *ret) +{ + struct gc_arena gc = gc_new (); + int s, seq, l, rtm_addrs, i; + pid_t pid; + struct sockaddr so_dst, so_mask; + char *cp = m_rtmsg.m_space; + struct sockaddr *gate = NULL, *sa; + struct rt_msghdr *rtm_aux; + +#define NEXTADDR(w, u) \ + if (rtm_addrs & (w)) {\ + l = ROUNDUP(u.sa_len); memmove(cp, &(u), l); cp += l;\ + } + +#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) + +#define rtm m_rtmsg.m_rtm + + pid = getpid(); + seq = 0; + rtm_addrs = RTA_DST | RTA_NETMASK; + + bzero(&so_dst, sizeof(so_dst)); + bzero(&so_mask, sizeof(so_mask)); + bzero(&rtm, sizeof(struct rt_msghdr)); + + rtm.rtm_type = RTM_GET; + rtm.rtm_flags = RTF_UP | RTF_GATEWAY; + rtm.rtm_version = RTM_VERSION; + rtm.rtm_seq = ++seq; + rtm.rtm_addrs = rtm_addrs; + + so_dst.sa_family = AF_INET; + so_dst.sa_len = sizeof(struct sockaddr_in); + so_mask.sa_family = AF_INET; + so_mask.sa_len = sizeof(struct sockaddr_in); + + NEXTADDR(RTA_DST, so_dst); + NEXTADDR(RTA_NETMASK, so_mask); + + rtm.rtm_msglen = l = cp - (char *)&m_rtmsg; + + s = socket(PF_ROUTE, SOCK_RAW, 0); + + if (write(s, (char *)&m_rtmsg, l) < 0) + { + warn("writing to routing socket"); + gc_free (&gc); + close(s); + return false; + } + + do { + l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg)); + } while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid)); + + close(s); + + rtm_aux = &rtm; + + cp = ((char *)(rtm_aux + 1)); + if (rtm_aux->rtm_addrs) { + for (i = 1; i; i <<= 1) + if (i & rtm_aux->rtm_addrs) { + sa = (struct sockaddr *)cp; + if (i == RTA_GATEWAY ) + gate = sa; + ADVANCE(cp, sa); + } + } + else + { + gc_free (&gc); + return false; + } + + + if (gate != NULL ) + { + *ret = ntohl(((struct sockaddr_in *)gate)->sin_addr.s_addr); +#if 1 + msg (M_INFO, "gw %s", + print_in_addr_t ((in_addr_t) *ret, 0, &gc)); +#endif + + gc_free (&gc); + return true; + } + else + { + gc_free (&gc); + return false; + } +} + +#else + +static bool +get_default_gateway (in_addr_t *ret) +{ + return false; +} + +#endif + +bool +netmask_to_netbits (const in_addr_t network, const in_addr_t netmask, int *netbits) +{ + int i; + const int addrlen = sizeof (in_addr_t) * 8; + + if ((network & netmask) == network) + { + for (i = 0; i <= addrlen; ++i) + { + in_addr_t mask = netbits_to_netmask (i); + if (mask == netmask) + { + if (i == addrlen) + *netbits = -1; + else + *netbits = i; + return true; + } + } + } + return false; +} |