/* * 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 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program (see the file COPYING included with this * distribution); if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* * Support routines for adding/deleting network routes. */ #include "syshead.h" #include "common.h" #include "error.h" #include "route.h" #include "misc.h" #include "socket.h" #include "manage.h" #include "memdbg.h" static void delete_route (const struct route *r, const struct tuntap *tt, unsigned int flags, const struct env_set *es); static bool get_default_gateway (in_addr_t *ret); static void get_bypass_addresses (struct route_bypass *rb, const unsigned int flags); #ifdef ENABLE_DEBUG static void print_bypass_addresses (const struct route_bypass *rb) { struct gc_arena gc = gc_new (); int i; for (i = 0; i < rb->n_bypass; ++i) { msg (D_ROUTE_DEBUG, "ROUTE DEBUG: bypass_host_route[%d]=%s", i, print_in_addr_t (rb->bypass[i], 0, &gc)); } gc_free (&gc); } #endif static bool add_bypass_address (struct route_bypass *rb, const in_addr_t a) { int i; for (i = 0; i < rb->n_bypass; ++i) { if (a == rb->bypass[i]) /* avoid duplicates */ return true; } if (rb->n_bypass < N_ROUTE_BYPASS) { rb->bypass[rb->n_bypass++] = a; return true; } else { return false; } } struct route_option_list * new_route_option_list (struct gc_arena *a) { struct route_option_list *ret; ALLOC_OBJ_CLEAR_GC (ret, struct route_option_list, a); return ret; } struct route_list * new_route_list (struct gc_arena *a) { struct route_list *ret; ALLOC_OBJ_CLEAR_GC (ret, struct route_list, a); return ret; } static const char * route_string (const struct route *r, struct gc_arena *gc) { struct buffer out = alloc_buf_gc (256, gc); buf_printf (&out, "ROUTE network %s netmask %s gateway %s", print_in_addr_t (r->network, 0, gc), print_in_addr_t (r->netmask, 0, gc), print_in_addr_t (r->gateway, 0, gc) ); if (r->metric_defined) buf_printf (&out, " metric %d", r->metric); return BSTR (&out); } static bool is_route_parm_defined (const char *parm) { if (!parm) return false; if (!strcmp (parm, "default")) return false; return true; } static void setenv_route_addr (struct env_set *es, const char *key, const in_addr_t addr, int i) { struct gc_arena gc = gc_new (); struct buffer name = alloc_buf_gc (256, &gc); if (i >= 0) buf_printf (&name, "route_%s_%d", key, i); else buf_printf (&name, "route_%s", key); setenv_str (es, BSTR (&name), print_in_addr_t (addr, 0, &gc)); gc_free (&gc); } static bool get_special_addr (const struct route_special_addr *spec, const char *string, in_addr_t *out, bool *status) { *status = true; if (!strcmp (string, "vpn_gateway")) { if (spec->remote_endpoint_defined) *out = spec->remote_endpoint; else { msg (M_INFO, PACKAGE_NAME " ROUTE: vpn_gateway undefined"); *status = false; } return true; } else if (!strcmp (string, "net_gateway")) { if (spec->net_gateway_defined) *out = spec->net_gateway; else { msg (M_INFO, PACKAGE_NAME " ROUTE: net_gateway undefined -- unable to get default gateway from system"); *status = false; } return true; } else if (!strcmp (string, "remote_host")) { if (spec->remote_host_defined) *out = spec->remote_host; else { msg (M_INFO, PACKAGE_NAME " ROUTE: remote_host undefined"); *status = false; } return true; } return false; } static bool init_route (struct route *r, const struct route_option *ro, const struct route_special_addr *spec) { const in_addr_t default_netmask = ~0; bool status; r->option = ro; r->defined = false; /* network */ if (!is_route_parm_defined (ro->network)) { goto fail; } if (!get_special_addr (spec, ro->network, &r->network, &status)) { r->network = getaddr ( GETADDR_RESOLVE | GETADDR_HOST_ORDER | GETADDR_WARN_ON_SIGNAL, ro->network, 0, &status, NULL); } if (!status) goto fail; /* netmask */ if (is_route_parm_defined (ro->netmask)) { r->netmask = getaddr ( GETADDR_HOST_ORDER | GETADDR_WARN_ON_SIGNAL, ro->netmask, 0, &status, NULL); if (!status) goto fail; } else r->netmask = default_netmask; /* gateway */ if (is_route_parm_defined (ro->gateway)) { if (!get_special_addr (spec, ro->gateway, &r->gateway, &status)) { r->gateway = getaddr ( GETADDR_RESOLVE | GETADDR_HOST_ORDER | GETADDR_WARN_ON_SIGNAL, ro->gateway, 0, &status, NULL); } if (!status) goto fail; } else { if (spec->remote_endpoint_defined) r->gateway = spec->remote_endpoint; else { msg (M_WARN, PACKAGE_NAME " ROUTE: " PACKAGE_NAME " needs a gateway parameter for a --route option and no default was specified by either --route-gateway or --ifconfig options"); goto fail; } } /* metric */ r->metric_defined = false; r->metric = 0; if (is_route_parm_defined (ro->metric)) { r->metric = atoi (ro->metric); if (r->metric < 0) { msg (M_WARN, PACKAGE_NAME " ROUTE: route metric for network %s (%s) must be >= 0", ro->network, ro->metric); goto fail; } r->metric_defined = true; } else if (spec->default_metric_defined) { r->metric = spec->default_metric; r->metric_defined = true; } r->defined = true; return true; fail: msg (M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve route for host/network: %s", ro->network); r->defined = false; return false; } void add_route_to_option_list (struct route_option_list *l, const char *network, const char *netmask, const char *gateway, const char *metric) { struct route_option *ro; if (l->n >= MAX_ROUTES) msg (M_FATAL, PACKAGE_NAME " ROUTE: cannot add more than %d routes", MAX_ROUTES); ro = &l->routes[l->n]; ro->network = network; ro->netmask = netmask; ro->gateway = gateway; ro->metric = metric; ++l->n; } void clear_route_list (struct route_list *rl) { CLEAR (*rl); } bool init_route_list (struct route_list *rl, const struct route_option_list *opt, const char *remote_endpoint, int default_metric, in_addr_t remote_host, struct env_set *es) { struct gc_arena gc = gc_new (); bool ret = true; clear_route_list (rl); rl->flags = opt->flags; if (remote_host) { rl->spec.remote_host = remote_host; rl->spec.remote_host_defined = true; } if (default_metric) { rl->spec.default_metric = default_metric; rl->spec.default_metric_defined = true; } rl->spec.net_gateway_defined = get_default_gateway (&rl->spec.net_gateway); if (rl->spec.net_gateway_defined) { setenv_route_addr (es, "net_gateway", rl->spec.net_gateway, -1); dmsg (D_ROUTE_DEBUG, "ROUTE DEBUG: default_gateway=%s", print_in_addr_t (rl->spec.net_gateway, 0, &gc)); } else { dmsg (D_ROUTE_DEBUG, "ROUTE DEBUG: default_gateway=UNDEF"); } if (rl->flags & RG_ENABLE) { get_bypass_addresses (&rl->spec.bypass, rl->flags); #ifdef ENABLE_DEBUG print_bypass_addresses (&rl->spec.bypass); #endif } if (is_route_parm_defined (remote_endpoint)) { rl->spec.remote_endpoint = getaddr ( GETADDR_RESOLVE | GETADDR_HOST_ORDER | GETADDR_WARN_ON_SIGNAL, remote_endpoint, 0, &rl->spec.remote_endpoint_defined, NULL); if (rl->spec.remote_endpoint_defined) { setenv_route_addr (es, "vpn_gateway", rl->spec.remote_endpoint, -1); } else { msg (M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve default gateway: %s", remote_endpoint); ret = false; } } else rl->spec.remote_endpoint_defined = false; ASSERT (opt->n >= 0 && opt->n < MAX_ROUTES); /* parse the routes from opt to rl */ { int i, j = 0; for (i = 0; i < opt->n; ++i) { if (!init_route (&rl->routes[j], &opt->routes[i], &rl->spec)) ret = false; else ++j; } rl->n = j; } gc_free (&gc); return ret; } static void add_route3 (in_addr_t network, in_addr_t netmask, in_addr_t gateway, const struct tuntap *tt, unsigned int flags, const struct env_set *es) { struct route r; CLEAR (r); r.defined = true; r.network = network; r.netmask = netmask; r.gateway = gateway; add_route (&r, tt, flags, es); } static void del_route3 (in_addr_t network, in_addr_t netmask, in_addr_t gateway, const struct tuntap *tt, unsigned int flags, const struct env_set *es) { struct route r; CLEAR (r); r.defined = true; r.network = network; r.netmask = netmask; r.gateway = gateway; delete_route (&r, tt, flags, es); } static void add_bypass_routes (struct route_bypass *rb, in_addr_t gateway, const struct tuntap *tt, unsigned int flags, const struct env_set *es) { int i; for (i = 0; i < rb->n_bypass; ++i) { if (rb->bypass[i] != gateway) add_route3 (rb->bypass[i], ~0, gateway, tt, flags, es); } } static void del_bypass_routes (struct route_bypass *rb, in_addr_t gateway, const struct tuntap *tt, unsigned int flags, const struct env_set *es) { int i; for (i = 0; i < rb->n_bypass; ++i) { if (rb->bypass[i] != gateway) del_route3 (rb->bypass[i], ~0, gateway, tt, flags, es); } } static void redirect_default_route_to_vpn (struct route_list *rl, const struct tuntap *tt, unsigned int flags, const struct env_set *es) { const char err[] = "NOTE: unable to redirect default gateway --"; if (rl->flags & RG_ENABLE) { if (!rl->spec.remote_endpoint_defined) { msg (M_WARN, "%s VPN gateway parameter (--route-gateway or --ifconfig) is missing", err); } else if (!rl->spec.net_gateway_defined) { msg (M_WARN, "%s Cannot read current default gateway from system", err); } else if (!rl->spec.remote_host_defined) { msg (M_WARN, "%s Cannot obtain current remote host address", err); } else { /* route remote host to original default gateway */ if (!(rl->flags & RG_LOCAL)) add_route3 (rl->spec.remote_host, ~0, rl->spec.net_gateway, tt, flags, es); /* route DHCP/DNS server traffic through original default gateway */ add_bypass_routes (&rl->spec.bypass, rl->spec.net_gateway, tt, flags, es); if (rl->flags & RG_DEF1) { /* add new default route (1st component) */ add_route3 (0x00000000, 0x80000000, rl->spec.remote_endpoint, tt, flags, es); /* add new default route (2nd component) */ add_route3 (0x80000000, 0x80000000, rl->spec.remote_endpoint, tt, flags, es); } else { /* delete default route */ del_route3 (0, 0, rl->spec.net_gateway, tt, flags, es); /* add new default route */ add_route3 (0, 0, rl->spec.remote_endpoint, tt, flags, es); } /* set a flag so we can undo later */ rl->did_redirect_default_gateway = true; } } } static void undo_redirect_default_route_to_vpn (struct route_list *rl, const struct tuntap *tt, unsigned int flags, const struct env_set *es) { if (rl->did_redirect_default_gateway) { /* delete remote host route */ if (!(rl->flags & RG_LOCAL)) del_route3 (rl->spec.remote_host, ~0, rl->spec.net_gateway, tt, flags, es); /* delete special DHCP/DNS bypass route */ del_bypass_routes (&rl->spec.bypass, rl->spec.net_gateway, tt, flags, es); if (rl->flags & RG_DEF1) { /* delete default route (1st component) */ del_route3 (0x00000000, 0x80000000, rl->spec.remote_endpoint, tt, flags, es); /* delete default route (2nd component) */ del_route3 (0x80000000, 0x80000000, rl->spec.remote_endpoint, tt, flags, es); } else { /* delete default route */ del_route3 (0, 0, rl->spec.remote_endpoint, tt, flags, es); /* restore original default route */ add_route3 (0, 0, rl->spec.net_gateway, tt, flags, es); } rl->did_redirect_default_gateway = false; } } void add_routes (struct route_list *rl, const struct tuntap *tt, unsigned int flags, const struct env_set *es) { redirect_default_route_to_vpn (rl, tt, flags, es); if (!rl->routes_added) { int i; #ifdef ENABLE_MANAGEMENT if (management && rl->n) { management_set_state (management, OPENVPN_STATE_ADD_ROUTES, NULL, 0, 0); } #endif for (i = 0; i < rl->n; ++i) { if (flags & ROUTE_DELETE_FIRST) delete_route (&rl->routes[i], tt, flags, es); add_route (&rl->routes[i], tt, flags, es); } rl->routes_added = true; } } void delete_routes (struct route_list *rl, const struct tuntap *tt, unsigned int flags, const struct env_set *es) { if (rl->routes_added) { int i; for (i = rl->n - 1; i >= 0; --i) { const struct route *r = &rl->routes[i]; delete_route (r, tt, flags, es); } rl->routes_added = false; } undo_redirect_default_route_to_vpn (rl, tt, flags, es); CLEAR (*rl); } #ifdef ENABLE_DEBUG static const char * show_opt (const char *option) { if (!option) return "nil"; else return option; } static void print_route_option (const struct route_option *ro, int level) { msg (level, " route %s/%s/%s/%s", show_opt (ro->network), show_opt (ro->netmask), show_opt (ro->gateway), show_opt (ro->metric)); } void print_route_options (const struct route_option_list *rol, int level) { int i; if (rol->flags & RG_ENABLE) msg (level, " [redirect_default_gateway local=%d]", (rol->flags & RG_LOCAL) != 0); for (i = 0; i < rol->n; ++i) print_route_option (&rol->routes[i], level); } #endif static void print_route (const struct route *r, int level) { struct gc_arena gc = gc_new (); if (r->defined) msg (level, "%s", route_string (r, &gc)); gc_free (&gc); } void print_routes (const struct route_list *rl, int level) { int i; for (i = 0; i < rl->n; ++i) print_route (&rl->routes[i], level); } static void setenv_route (struct env_set *es, const struct route *r, int i) { struct gc_arena gc = gc_new (); if (r->defined) { setenv_route_addr (es, "network", r->network, i); setenv_route_addr (es, "netmask", r->netmask, i); setenv_route_addr (es, "gateway", r->gateway, i); if (r->metric_defined) { struct buffer name = alloc_buf_gc (256, &gc); buf_printf (&name, "route_metric_%d", i); setenv_int (es, BSTR (&name), r->metric); } } gc_free (&gc); } void setenv_routes (struct env_set *es, const struct route_list *rl) { int i; for (i = 0; i < rl->n; ++i) setenv_route (es, &rl->routes[i], i + 1); } void add_route (struct route *r, const struct tuntap *tt, unsigned int flags, const struct env_set *es) { struct gc_arena gc; struct buffer buf; const char *network; const char *netmask; const char *gateway; bool status = false; if (!r->defined) return; gc_init (&gc); buf = alloc_buf_gc (256, &gc); network = print_in_addr_t (r->network, 0, &gc); netmask = print_in_addr_t (r->netmask, 0, &gc); gateway = print_in_addr_t (r->gateway, 0, &gc); /* * Filter out routes which are essentially no-ops */ if (r->network == r->gateway && r->netmask == 0xFFFFFFFF) { msg (M_INFO, PACKAGE_NAME " ROUTE: omitted no-op route: %s/%s -> %s", network, netmask, gateway); goto done; } #if defined(TARGET_LINUX) #ifdef CONFIG_FEATURE_IPROUTE buf_printf (&buf, "%s route add %s/%d via %s", iproute_path, network, count_netmask_bits(netmask), gateway); if (r->metric_defined) buf_printf (&buf, " metric %d", r->metric); #else buf_printf (&buf, ROUTE_PATH " add -net %s netmask %s gw %s", network, netmask, gateway); if (r->metric_defined) buf_printf (&buf, " metric %d", r->metric); #endif /*CONFIG_FEATURE_IPROUTE*/ msg (D_ROUTE, "%s", BSTR (&buf)); status = system_check (BSTR (&buf), es, 0, "ERROR: Linux route add command failed"); #elif defined (WIN32) buf_printf (&buf, ROUTE_PATH " ADD %s MASK %s %s", network, netmask, gateway); if (r->metric_defined) buf_printf (&buf, " METRIC %d", r->metric); msg (D_ROUTE, "%s", BSTR (&buf)); if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_IPAPI) { status = add_route_ipapi (r, tt); msg (D_ROUTE, "Route addition via IPAPI %s", status ? "succeeded" : "failed"); } else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_EXE) { netcmd_semaphore_lock (); status = system_check (BSTR (&buf), es, 0, "ERROR: Windows route add command failed"); netcmd_semaphore_release (); } else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_ADAPTIVE) { status = add_route_ipapi (r, tt); msg (D_ROUTE, "Route addition via IPAPI %s [adaptive]", status ? "succeeded" : "failed"); if (!status) { msg (D_ROUTE, "Route addition fallback to route.exe"); netcmd_semaphore_lock (); status = system_check (BSTR (&buf), es, 0, "ERROR: Windows route add command failed [adaptive]"); netcmd_semaphore_release (); } } else { ASSERT (0); } #elif defined (TARGET_SOLARIS) /* example: route add 192.0.2.32 -netmask 255.255.255.224 somegateway */ buf_printf (&buf, ROUTE_PATH " add"); #if 0 if (r->metric_defined) buf_printf (&buf, " -rtt %d", r->metric); #endif buf_printf (&buf, " %s -netmask %s %s", network, netmask, gateway); msg (D_ROUTE, "%s", BSTR (&buf)); status = system_check (BSTR (&buf), es, 0, "ERROR: Solaris route add command failed"); #elif defined(TARGET_FREEBSD) buf_printf (&buf, ROUTE_PATH " add"); #if 0 if (r->metric_defined) buf_printf (&buf, " -rtt %d", r->metric); #endif buf_printf (&buf, " -net %s %s %s", network, gateway, netmask); msg (D_ROUTE, "%s", BSTR (&buf)); status = system_check (BSTR (&buf), es, 0, "ERROR: FreeBSD route add command failed"); #elif defined(TARGET_DRAGONFLY) 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: DragonFly 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, "%s route del %s/%d", iproute_path, network, count_netmask_bits(netmask)); #else buf_printf (&buf, ROUTE_PATH " del -net %s netmask %s", network, netmask); #endif /*CONFIG_FEATURE_IPROUTE*/ if (r->metric_defined) buf_printf (&buf, " metric %d", r->metric); msg (D_ROUTE, "%s", BSTR (&buf)); system_check (BSTR (&buf), es, 0, "ERROR: Linux route delete command failed"); #elif defined (WIN32) buf_printf (&buf, ROUTE_PATH " DELETE %s MASK %s %s", network, netmask, gateway); msg (D_ROUTE, "%s", BSTR (&buf)); if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_IPAPI) { const bool status = del_route_ipapi (r, tt); msg (D_ROUTE, "Route deletion via IPAPI %s", status ? "succeeded" : "failed"); } else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_EXE) { netcmd_semaphore_lock (); system_check (BSTR (&buf), es, 0, "ERROR: Windows route delete command failed"); netcmd_semaphore_release (); } else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_ADAPTIVE) { const bool status = del_route_ipapi (r, tt); msg (D_ROUTE, "Route deletion via IPAPI %s [adaptive]", status ? "succeeded" : "failed"); if (!status) { msg (D_ROUTE, "Route deletion fallback to route.exe"); netcmd_semaphore_lock (); system_check (BSTR (&buf), es, 0, "ERROR: Windows route delete command failed [adaptive]"); netcmd_semaphore_release (); } } else { ASSERT (0); } #elif defined (TARGET_SOLARIS) buf_printf (&buf, ROUTE_PATH " delete %s -netmask %s %s", network, netmask, gateway); msg (D_ROUTE, "%s", BSTR (&buf)); system_check (BSTR (&buf), es, 0, "ERROR: Solaris route delete command failed"); #elif defined(TARGET_FREEBSD) buf_printf (&buf, ROUTE_PATH " delete -net %s %s %s", network, gateway, netmask); msg (D_ROUTE, "%s", BSTR (&buf)); system_check (BSTR (&buf), es, 0, "ERROR: FreeBSD route delete command failed"); #elif defined(TARGET_DRAGONFLY) 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: DragonFly route delete command failed"); #elif defined(TARGET_DARWIN) buf_printf (&buf, ROUTE_PATH " delete -net %s %s %s", network, gateway, netmask); msg (D_ROUTE, "%s", BSTR (&buf)); system_check (BSTR (&buf), es, 0, "ERROR: OS X route delete command failed"); #elif defined(TARGET_OPENBSD) || defined(TARGET_NETBSD) buf_printf (&buf, ROUTE_PATH " delete -net %s %s -netmask %s", network, gateway, netmask); msg (D_ROUTE, "%s", BSTR (&buf)); system_check (BSTR (&buf), es, 0, "ERROR: OpenBSD/NetBSD route delete command failed"); #else msg (M_FATAL, "Sorry, but I don't know how to do 'route' commands on this operating system. Try putting your routes in a --route-up script"); #endif gc_free (&gc); } /* * The --redirect-gateway option requires OS-specific code below * to get the current default gateway. */ #if defined(WIN32) static const MIB_IPFORWARDTABLE * get_windows_routing_table (struct gc_arena *gc) { ULONG size = 0; PMIB_IPFORWARDTABLE rt = NULL; DWORD status; status = GetIpForwardTable (NULL, &size, TRUE); if (status == ERROR_INSUFFICIENT_BUFFER) { rt = (PMIB_IPFORWARDTABLE) gc_malloc (size, false, gc); status = GetIpForwardTable (rt, &size, TRUE); if (status != NO_ERROR) { msg (D_ROUTE, "NOTE: GetIpForwardTable returned error: %s (code=%u)", strerror_win32 (status, gc), (unsigned int)status); rt = NULL; } } return rt; } static int test_route (const IP_ADAPTER_INFO *adapters, const in_addr_t gateway, DWORD *index) { int count = 0; DWORD i = adapter_index_of_ip (adapters, gateway, &count); if (index) *index = i; return count; } static void test_route_helper (bool *ret, int *count, int *good, int *ambig, const IP_ADAPTER_INFO *adapters, const in_addr_t gateway) { int c; ++*count; c = test_route (adapters, gateway, NULL); if (c == 0) *ret = false; else ++*good; if (c > 1) ++*ambig; } /* * If we tried to add routes now, would we succeed? */ bool test_routes (const struct route_list *rl, const struct tuntap *tt) { struct gc_arena gc = gc_new (); const IP_ADAPTER_INFO *adapters = get_adapter_info_list (&gc); bool ret = false; int count = 0; int good = 0; int ambig = 0; bool adapter_up = false; if (is_adapter_up (tt, adapters)) { ret = true; adapter_up = true; if (rl) { int i; for (i = 0; i < rl->n; ++i) test_route_helper (&ret, &count, &good, &ambig, adapters, rl->routes[i].gateway); if ((rl->flags & RG_ENABLE) && rl->spec.remote_endpoint_defined) test_route_helper (&ret, &count, &good, &ambig, adapters, rl->spec.remote_endpoint); } } msg (D_ROUTE, "TEST ROUTES: %d/%d succeeded len=%d ret=%d a=%d u/d=%s", good, count, rl ? rl->n : -1, (int)ret, ambig, adapter_up ? "up" : "down"); gc_free (&gc); return ret; } static const MIB_IPFORWARDROW * get_default_gateway_row (const MIB_IPFORWARDTABLE *routes) { struct gc_arena gc = gc_new (); DWORD lowest_metric = ~0; const MIB_IPFORWARDROW *ret = NULL; int i; int best = -1; if (routes) { for (i = 0; i < routes->dwNumEntries; ++i) { const MIB_IPFORWARDROW *row = &routes->table[i]; const in_addr_t net = ntohl (row->dwForwardDest); const in_addr_t mask = ntohl (row->dwForwardMask); const DWORD index = row->dwForwardIfIndex; const DWORD metric = row->dwForwardMetric1; dmsg (D_ROUTE_DEBUG, "GDGR: route[%d] %s/%s i=%d m=%d", i, print_in_addr_t ((in_addr_t) net, 0, &gc), print_in_addr_t ((in_addr_t) mask, 0, &gc), (int)index, (int)metric); if (!net && !mask && metric < lowest_metric) { ret = row; lowest_metric = metric; best = i; } } } dmsg (D_ROUTE_DEBUG, "GDGR: best=%d lm=%u", best, (unsigned int)lowest_metric); gc_free (&gc); return ret; } static bool get_default_gateway (in_addr_t *ret) { struct gc_arena gc = gc_new (); bool ret_bool = false; const MIB_IPFORWARDTABLE *routes = get_windows_routing_table (&gc); const MIB_IPFORWARDROW *row = get_default_gateway_row (routes); if (row) { *ret = ntohl (row->dwForwardNextHop); ret_bool = true; } gc_free (&gc); return ret_bool; } static DWORD windows_route_find_if_index (const struct route *r, const struct tuntap *tt) { struct gc_arena gc = gc_new (); DWORD ret = ~0; int count = 0; const IP_ADAPTER_INFO *adapters = get_adapter_info_list (&gc); const IP_ADAPTER_INFO *tun_adapter = get_tun_adapter (tt, adapters); bool on_tun = false; /* first test on tun interface */ if (is_ip_in_adapter_subnet (tun_adapter, r->gateway, NULL)) { ret = tun_adapter->Index; count = 1; on_tun = true; } else /* test on other interfaces */ { count = test_route (adapters, r->gateway, &ret); } if (count == 0) { msg (M_WARN, "Warning: route gateway is not reachable on any active network adapters: %s", print_in_addr_t (r->gateway, 0, &gc)); ret = ~0; } else if (count > 1) { msg (M_WARN, "Warning: route gateway is ambiguous: %s (%d matches)", print_in_addr_t (r->gateway, 0, &gc), count); ret = ~0; } dmsg (D_ROUTE_DEBUG, "DEBUG: route find if: on_tun=%d count=%d index=%d", on_tun, count, (int)ret); gc_free (&gc); return ret; } bool add_route_ipapi (const struct route *r, const struct tuntap *tt) { struct gc_arena gc = gc_new (); bool ret = false; DWORD status; const DWORD if_index = windows_route_find_if_index (r, tt); if (if_index != ~0) { MIB_IPFORWARDROW fr; CLEAR (fr); fr.dwForwardDest = htonl (r->network); fr.dwForwardMask = htonl (r->netmask); fr.dwForwardPolicy = 0; fr.dwForwardNextHop = htonl (r->gateway); fr.dwForwardIfIndex = if_index; fr.dwForwardType = 4; /* the next hop is not the final dest */ fr.dwForwardProto = 3; /* PROTO_IP_NETMGMT */ fr.dwForwardAge = 0; fr.dwForwardNextHopAS = 0; fr.dwForwardMetric1 = r->metric_defined ? r->metric : 1; fr.dwForwardMetric2 = ~0; fr.dwForwardMetric3 = ~0; fr.dwForwardMetric4 = ~0; fr.dwForwardMetric5 = ~0; if ((r->network & r->netmask) != r->network) msg (M_WARN, "Warning: address %s is not a network address in relation to netmask %s", print_in_addr_t (r->network, 0, &gc), print_in_addr_t (r->netmask, 0, &gc)); status = CreateIpForwardEntry (&fr); if (status == NO_ERROR) ret = true; else { /* failed, try increasing the metric to work around Vista issue */ const unsigned int forward_metric_limit = 2048; /* iteratively retry higher metrics up to this limit */ for ( ; fr.dwForwardMetric1 <= forward_metric_limit; ++fr.dwForwardMetric1) { /* try a different forward type=3 ("the next hop is the final dest") in addition to 4. --redirect-gateway over RRAS seems to need this. */ for (fr.dwForwardType = 4; fr.dwForwardType >= 3; --fr.dwForwardType) { status = CreateIpForwardEntry (&fr); if (status == NO_ERROR) { msg (D_ROUTE, "ROUTE: CreateIpForwardEntry succeeded with dwForwardMetric1=%u and dwForwardType=%u", (unsigned int)fr.dwForwardMetric1, (unsigned int)fr.dwForwardType); ret = true; goto doublebreak; } else if (status != ERROR_BAD_ARGUMENTS) goto doublebreak; } } doublebreak: if (status != NO_ERROR) msg (M_WARN, "ROUTE: route addition failed using CreateIpForwardEntry: %s [status=%u if_index=%u]", strerror_win32 (status, &gc), (unsigned int)status, (unsigned int)if_index); } } gc_free (&gc); return ret; } bool del_route_ipapi (const struct route *r, const struct tuntap *tt) { struct gc_arena gc = gc_new (); bool ret = false; DWORD status; const DWORD if_index = windows_route_find_if_index (r, tt); if (if_index != ~0) { MIB_IPFORWARDROW fr; CLEAR (fr); fr.dwForwardDest = htonl (r->network); fr.dwForwardMask = htonl (r->netmask); fr.dwForwardPolicy = 0; fr.dwForwardNextHop = htonl (r->gateway); fr.dwForwardIfIndex = if_index; status = DeleteIpForwardEntry (&fr); if (status == NO_ERROR) ret = true; else msg (M_WARN, "ROUTE: route deletion failed using DeleteIpForwardEntry: %s", strerror_win32 (status, &gc)); } gc_free (&gc); return ret; } static const char * format_route_entry (const MIB_IPFORWARDROW *r, struct gc_arena *gc) { struct buffer out = alloc_buf_gc (256, gc); buf_printf (&out, "%s %s %s p=%d i=%d t=%d pr=%d a=%d h=%d m=%d/%d/%d/%d/%d", print_in_addr_t (r->dwForwardDest, IA_NET_ORDER, gc), print_in_addr_t (r->dwForwardMask, IA_NET_ORDER, gc), print_in_addr_t (r->dwForwardNextHop, IA_NET_ORDER, gc), (int)r->dwForwardPolicy, (int)r->dwForwardIfIndex, (int)r->dwForwardType, (int)r->dwForwardProto, (int)r->dwForwardAge, (int)r->dwForwardNextHopAS, (int)r->dwForwardMetric1, (int)r->dwForwardMetric2, (int)r->dwForwardMetric3, (int)r->dwForwardMetric4, (int)r->dwForwardMetric5); return BSTR (&out); } /* * Show current routing table */ void show_routes (int msglev) { struct gc_arena gc = gc_new (); int i; const MIB_IPFORWARDTABLE *rt = get_windows_routing_table (&gc); msg (msglev, "SYSTEM ROUTING TABLE"); if (rt) { for (i = 0; i < rt->dwNumEntries; ++i) { msg (msglev, "%s", format_route_entry (&rt->table[i], &gc)); } } gc_free (&gc); } #elif defined(TARGET_LINUX) 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)||defined(TARGET_DRAGONFLY) #include #include #include /* all of this is taken from 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 #include #include /* all of this is taken from 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 #include #include /* all of this is taken from in OpenBSD 3.6 */ #define RTA_DST 0x1 /* destination sockaddr present */ #define RTA_GATEWAY 0x2 /* gateway sockaddr present */ #define RTA_NETMASK 0x4 /* netmask sockaddr present */ #define RTM_GET 0x4 /* Report Metrics */ #define RTM_VERSION 3 /* Up the ante and ignore older versions */ #define RTF_UP 0x1 /* route usable */ #define RTF_GATEWAY 0x2 /* destination is a gateway */ /* * Huge version for userland compatibility. */ struct rt_metrics { u_long rmx_locks; /* Kernel must leave these values alone */ u_long rmx_mtu; /* MTU for this path */ u_long rmx_hopcount; /* max hops expected */ u_long rmx_expire; /* lifetime for route, e.g. redirect */ u_long rmx_recvpipe; /* inbound delay-bandwidth product */ u_long rmx_sendpipe; /* outbound delay-bandwidth product */ u_long rmx_ssthresh; /* outbound gateway buffer limit */ u_long rmx_rtt; /* estimated round trip time */ u_long rmx_rttvar; /* estimated rtt variance */ u_long rmx_pksent; /* packets sent using this route */ }; /* * Structures for routing messages. */ struct rt_msghdr { u_short rtm_msglen; /* to skip over non-understood messages */ u_char rtm_version; /* future binary compatibility */ u_char rtm_type; /* message type */ u_short rtm_index; /* index for associated ifp */ int rtm_flags; /* flags, incl. kern & message, e.g. DONE */ int rtm_addrs; /* bitmask identifying sockaddrs in msg */ pid_t rtm_pid; /* identify sender */ int rtm_seq; /* for sender to identify action */ int rtm_errno; /* why failed */ int rtm_use; /* from rtentry */ u_long rtm_inits; /* which metrics we are initializing */ struct rt_metrics rtm_rmx; /* metrics themselves */ }; struct { struct rt_msghdr m_rtm; char m_space[512]; } m_rtmsg; #define ROUNDUP(a) \ ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) static bool get_default_gateway (in_addr_t *ret) { struct gc_arena gc = gc_new (); int s, seq, l, rtm_addrs, i; pid_t pid; struct sockaddr so_dst, so_mask; char *cp = m_rtmsg.m_space; struct sockaddr *gate = NULL, *sa; struct rt_msghdr *rtm_aux; #define NEXTADDR(w, u) \ if (rtm_addrs & (w)) {\ l = ROUNDUP(u.sa_len); memmove(cp, &(u), l); cp += l;\ } #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) #define rtm m_rtmsg.m_rtm pid = getpid(); seq = 0; rtm_addrs = RTA_DST | RTA_NETMASK; bzero(&so_dst, sizeof(so_dst)); bzero(&so_mask, sizeof(so_mask)); bzero(&rtm, sizeof(struct rt_msghdr)); rtm.rtm_type = RTM_GET; rtm.rtm_flags = RTF_UP | RTF_GATEWAY; rtm.rtm_version = RTM_VERSION; rtm.rtm_seq = ++seq; rtm.rtm_addrs = rtm_addrs; so_dst.sa_family = AF_INET; so_dst.sa_len = sizeof(struct sockaddr_in); so_mask.sa_family = AF_INET; so_mask.sa_len = sizeof(struct sockaddr_in); NEXTADDR(RTA_DST, so_dst); NEXTADDR(RTA_NETMASK, so_mask); rtm.rtm_msglen = l = cp - (char *)&m_rtmsg; s = socket(PF_ROUTE, SOCK_RAW, 0); if (write(s, (char *)&m_rtmsg, l) < 0) { warn("writing to routing socket"); gc_free (&gc); close(s); return false; } do { l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg)); } while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid)); close(s); rtm_aux = &rtm; cp = ((char *)(rtm_aux + 1)); if (rtm_aux->rtm_addrs) { for (i = 1; i; i <<= 1) if (i & rtm_aux->rtm_addrs) { sa = (struct sockaddr *)cp; if (i == RTA_GATEWAY ) gate = sa; ADVANCE(cp, sa); } } else { gc_free (&gc); return false; } if (gate != NULL ) { *ret = ntohl(((struct sockaddr_in *)gate)->sin_addr.s_addr); #if 1 msg (M_INFO, "gw %s", print_in_addr_t ((in_addr_t) *ret, 0, &gc)); #endif gc_free (&gc); return true; } else { gc_free (&gc); return false; } } #else static bool get_default_gateway (in_addr_t *ret) { return false; } #endif bool netmask_to_netbits (const in_addr_t network, const in_addr_t netmask, int *netbits) { int i; const int addrlen = sizeof (in_addr_t) * 8; if ((network & netmask) == network) { for (i = 0; i <= addrlen; ++i) { in_addr_t mask = netbits_to_netmask (i); if (mask == netmask) { if (i == addrlen) *netbits = -1; else *netbits = i; return true; } } } return false; } /* * get_bypass_addresses() is used by the redirect-gateway bypass-x * functions to build a route bypass to selected DHCP/DNS servers, * so that outgoing packets to these servers don't end up in the tunnel. */ #if defined(WIN32) static void add_host_route_if_nonlocal (struct route_bypass *rb, const in_addr_t addr, const IP_ADAPTER_INFO *dgi) { if (!is_ip_in_adapter_subnet (dgi, addr, NULL)) add_bypass_address (rb, addr); } static void add_host_route_array (struct route_bypass *rb, const IP_ADAPTER_INFO *dgi, const IP_ADDR_STRING *iplist) { while (iplist) { bool succeed = false; const in_addr_t ip = getaddr (GETADDR_HOST_ORDER, iplist->IpAddress.String, 0, &succeed, NULL); if (succeed) { add_host_route_if_nonlocal (rb, ip, dgi); } iplist = iplist->Next; } } static void get_bypass_addresses (struct route_bypass *rb, const unsigned int flags) { struct gc_arena gc = gc_new (); bool ret_bool = false; /* get full routing table */ const MIB_IPFORWARDTABLE *routes = get_windows_routing_table (&gc); /* get the route which represents the default gateway */ const MIB_IPFORWARDROW *row = get_default_gateway_row (routes); if (row) { /* get the adapter which the default gateway is associated with */ const IP_ADAPTER_INFO *dgi = get_adapter_info (row->dwForwardIfIndex, &gc); /* get extra adapter info, such as DNS addresses */ const IP_PER_ADAPTER_INFO *pai = get_per_adapter_info (row->dwForwardIfIndex, &gc); /* Bypass DHCP server address */ if ((flags & RG_BYPASS_DHCP) && dgi && dgi->DhcpEnabled) add_host_route_array (rb, dgi, &dgi->DhcpServer); /* Bypass DNS server addresses */ if ((flags & RG_BYPASS_DNS) && pai) add_host_route_array (rb, dgi, &pai->DnsServerList); } gc_free (&gc); } #else static void get_bypass_addresses (struct route_bypass *rb, const unsigned int flags) { } #endif #if AUTO_USERID #if defined(TARGET_LINUX) bool get_default_gateway_mac_addr (unsigned char *macaddr) { struct ifreq *ifr, *ifend; in_addr_t ina, mask; struct ifreq ifreq; struct ifconf ifc; struct ifreq ifs[20]; // Maximum number of interfaces to scan int sd = -1; in_addr_t gwip = 0; bool ret = false; if (!get_default_gateway (&gwip)) { msg (M_WARN, "GDGMA: get_default_gateway failed"); goto err; } if ((sd = socket (AF_INET, SOCK_DGRAM, 0)) < 0) { msg (M_WARN, "GDGMA: socket() failed"); goto err; } ifc.ifc_len = sizeof (ifs); ifc.ifc_req = ifs; if (ioctl (sd, SIOCGIFCONF, &ifc) < 0) { msg (M_WARN, "GDGMA: ioctl(SIOCGIFCONF) failed"); goto err; } /* 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) { ina = ntohl(((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr); strncpynt (ifreq.ifr_name, ifr->ifr_name, sizeof (ifreq.ifr_name)); dmsg (D_AUTO_USERID, "GDGMA: %s", ifreq.ifr_name); /* check that the interface is up, and not point-to-point or loopback */ if (ioctl (sd, SIOCGIFFLAGS, &ifreq) < 0) { dmsg (D_AUTO_USERID, "GDGMA: SIOCGIFFLAGS(%s) failed", ifreq.ifr_name); continue; } if ((ifreq.ifr_flags & (IFF_UP|IFF_LOOPBACK)) != IFF_UP) { dmsg (D_AUTO_USERID, "GDGMA: interface %s is down or loopback", ifreq.ifr_name); continue; } /* get interface netmask and check for correct subnet */ if (ioctl (sd, SIOCGIFNETMASK, &ifreq) < 0) { dmsg (D_AUTO_USERID, "GDGMA: SIOCGIFNETMASK(%s) failed", ifreq.ifr_name); continue; } mask = ntohl(((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr); if (((gwip ^ ina) & mask) != 0) { dmsg (D_AUTO_USERID, "GDGMA: gwip=0x%08x ina=0x%08x mask=0x%08x", (unsigned int)gwip, (unsigned int)ina, (unsigned int)mask); continue; } break; } } if (ifr >= ifend) { msg (M_WARN, "GDGMA: couldn't find gw interface"); goto err; } /* now get the hardware address. */ memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr)); if (ioctl (sd, SIOCGIFHWADDR, &ifreq) < 0) { msg (M_WARN, "GDGMA: SIOCGIFHWADDR(%s) failed", ifreq.ifr_name); goto err; } memcpy (macaddr, &ifreq.ifr_hwaddr.sa_data, 6); ret = true; err: if (sd >= 0) close (sd); return ret; } #elif defined(WIN32) bool get_default_gateway_mac_addr (unsigned char *macaddr) { struct gc_arena gc = gc_new (); const IP_ADAPTER_INFO *adapters = get_adapter_info_list (&gc); in_addr_t gwip = 0; DWORD a_index; const IP_ADAPTER_INFO *ai; if (!get_default_gateway (&gwip)) { msg (M_WARN, "GDGMA: get_default_gateway failed"); goto err; } a_index = adapter_index_of_ip (adapters, gwip, NULL); ai = get_adapter (adapters, a_index); if (!ai) { msg (M_WARN, "GDGMA: couldn't find gw interface"); goto err; } memcpy (macaddr, ai->Address, 6); gc_free (&gc); return true; err: gc_free (&gc); return false; } #else bool get_default_gateway_mac_addr (unsigned char *macaddr) { return false; } #endif #endif /* AUTO_USERID */