mirror of
https://github.com/deneraraujo/OpenVPNAdapter.git
synced 2026-04-24 00:00:05 +08:00
Merge commit '86cc97e55fe346502462284d2e636a2b3708163e' as 'Sources/OpenVPN3'
This commit is contained in:
Sergey Abramchuk
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// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2017 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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#pragma once
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <net/if.h>
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#include <linux/if_tun.h>
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#include <openvpn/common/exception.hpp>
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#include <openvpn/common/file.hpp>
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#include <openvpn/common/split.hpp>
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#include <openvpn/common/splitlines.hpp>
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#include <openvpn/common/hexstr.hpp>
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#include <openvpn/common/to_string.hpp>
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#include <openvpn/common/process.hpp>
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#include <openvpn/common/action.hpp>
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#include <openvpn/addr/route.hpp>
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#include <openvpn/tun/builder/capture.hpp>
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#include <openvpn/tun/builder/setup.hpp>
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#include <openvpn/tun/client/tunbase.hpp>
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#include <openvpn/tun/client/tunprop.hpp>
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#include <openvpn/tun/client/tunprop.hpp>
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#include <openvpn/tun/linux/client/tunsetup.hpp>
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#include <openvpn/netconf/linux/gw.hpp>
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namespace openvpn {
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namespace TunIPRoute {
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using namespace openvpn::TunLinuxSetup;
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enum { // add_del_route flags
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R_IPv6=(1<<0),
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R_ADD_SYS=(1<<1),
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R_ADD_DCO=(1<<2),
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R_ADD_ALL=R_ADD_SYS|R_ADD_DCO,
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};
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inline IP::Addr cvt_pnr_ip_v4(const std::string& hexaddr)
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{
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BufferAllocated v(4, BufferAllocated::CONSTRUCT_ZERO);
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parse_hex(v, hexaddr);
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if (v.size() != 4)
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throw tun_linux_error("bad hex address");
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IPv4::Addr ret = IPv4::Addr::from_bytes(v.data());
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return IP::Addr::from_ipv4(ret);
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}
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inline void add_del_route(const std::string& addr_str,
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const int prefix_len,
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const std::string& gateway_str,
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const std::string& dev,
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const unsigned int flags,
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std::vector<IP::Route>* rtvec,
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Action::Ptr& create,
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Action::Ptr& destroy)
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{
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if (flags & R_IPv6)
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{
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const IPv6::Addr addr = IPv6::Addr::from_string(addr_str);
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const IPv6::Addr netmask = IPv6::Addr::netmask_from_prefix_len(prefix_len);
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const IPv6::Addr net = addr & netmask;
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if (flags & R_ADD_SYS)
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{
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// ip route add 2001:db8:1::/48 via 2001:db8:1::1
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Command::Ptr add(new Command);
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add->argv.push_back("/sbin/ip");
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add->argv.push_back("-6");
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add->argv.push_back("route");
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add->argv.push_back("prepend");
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add->argv.push_back(net.to_string() + '/' + openvpn::to_string(prefix_len));
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add->argv.push_back("via");
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add->argv.push_back(gateway_str);
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if (!dev.empty())
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{
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add->argv.push_back("dev");
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add->argv.push_back(dev);
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}
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create = add;
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// for the destroy command, copy the add command but replace "add" with "delete"
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Command::Ptr del(add->copy());
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del->argv[3] = "del";
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destroy = del;
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}
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if (rtvec && (flags & R_ADD_DCO))
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rtvec->emplace_back(IP::Addr::from_ipv6(net), prefix_len);
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}
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else
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{
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const IPv4::Addr addr = IPv4::Addr::from_string(addr_str);
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const IPv4::Addr netmask = IPv4::Addr::netmask_from_prefix_len(prefix_len);
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const IPv4::Addr net = addr & netmask;
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if (flags & R_ADD_SYS)
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{
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// ip route add 192.0.2.128/25 via 192.0.2.1
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Command::Ptr add(new Command);
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add->argv.push_back("/sbin/ip");
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add->argv.push_back("-4");
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add->argv.push_back("route");
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add->argv.push_back("prepend");
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add->argv.push_back(net.to_string() + '/' + openvpn::to_string(prefix_len));
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add->argv.push_back("via");
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add->argv.push_back(gateway_str);
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if (!dev.empty())
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{
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add->argv.push_back("dev");
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add->argv.push_back(dev);
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}
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create = add;
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// for the destroy command, copy the add command but replace "add" with "delete"
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Command::Ptr del(add->copy());
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del->argv[3] = "del";
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destroy = del;
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}
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if (rtvec && (flags & R_ADD_DCO))
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rtvec->emplace_back(IP::Addr::from_ipv4(net), prefix_len);
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}
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}
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inline void add_del_route(const std::string& addr_str,
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const int prefix_len,
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const std::string& gateway_str,
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const std::string& dev,
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const unsigned int flags,// add interface route to rtvec if defined
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std::vector<IP::Route>* rtvec,
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ActionList& create,
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ActionList& destroy)
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{
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Action::Ptr c, d;
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add_del_route(addr_str, prefix_len, gateway_str, dev, flags, rtvec, c, d);
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create.add(c);
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destroy.add(d);
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}
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inline void iface_up(const std::string& iface_name,
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const int mtu,
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ActionList& create,
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ActionList& destroy)
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{
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{
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Command::Ptr add(new Command);
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add->argv.push_back("/sbin/ip");
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add->argv.push_back("link");
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add->argv.push_back("set");
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add->argv.push_back(iface_name);
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add->argv.push_back("up");
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if (mtu > 0)
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{
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add->argv.push_back("mtu");
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add->argv.push_back(openvpn::to_string(mtu));
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}
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create.add(add);
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// for the destroy command, copy the add command but replace "up" with "down"
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Command::Ptr del(add->copy());
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del->argv[4] = "down";
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destroy.add(del);
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}
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}
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inline void iface_config(const std::string& iface_name,
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int unit,
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const TunBuilderCapture& pull,
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std::vector<IP::Route>* rtvec,
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ActionList& create,
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ActionList& destroy)
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{
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// set local4 and local6 to point to IPv4/6 route configurations
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const TunBuilderCapture::RouteAddress* local4 = pull.vpn_ipv4();
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const TunBuilderCapture::RouteAddress* local6 = pull.vpn_ipv6();
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// Set IPv4 Interface
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if (local4)
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{
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Command::Ptr add(new Command);
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add->argv.push_back("/sbin/ip");
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add->argv.push_back("-4");
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add->argv.push_back("addr");
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add->argv.push_back("add");
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add->argv.push_back(local4->address + '/' + openvpn::to_string(local4->prefix_length));
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add->argv.push_back("broadcast");
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add->argv.push_back((IPv4::Addr::from_string(local4->address) | ~IPv4::Addr::netmask_from_prefix_len(local4->prefix_length)).to_string());
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add->argv.push_back("dev");
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add->argv.push_back(iface_name);
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if (unit >= 0)
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{
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add->argv.push_back("label");
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add->argv.push_back(iface_name + ':' + openvpn::to_string(unit));
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}
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create.add(add);
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// for the destroy command, copy the add command but replace "add" with "delete"
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Command::Ptr del(add->copy());
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del->argv[3] = "del";
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destroy.add(del);
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// add interface route to rtvec if defined
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add_del_route(local4->address, local4->prefix_length, local4->address, iface_name, R_ADD_DCO, rtvec, create, destroy);
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}
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// Set IPv6 Interface
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if (local6 && !pull.block_ipv6)
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{
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Command::Ptr add(new Command);
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add->argv.push_back("/sbin/ip");
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add->argv.push_back("-6");
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add->argv.push_back("addr");
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add->argv.push_back("add");
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add->argv.push_back(local6->address + '/' + openvpn::to_string(local6->prefix_length));
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add->argv.push_back("dev");
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add->argv.push_back(iface_name);
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create.add(add);
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// for the destroy command, copy the add command but replace "add" with "delete"
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Command::Ptr del(add->copy());
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del->argv[3] = "del";
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destroy.add(del);
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// add interface route to rtvec if defined
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add_del_route(local6->address, local6->prefix_length, local6->address, iface_name, R_ADD_DCO|R_IPv6, rtvec, create, destroy);
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}
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}
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struct TunMethods
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{
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static inline void tun_config(const std::string& iface_name,
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const TunBuilderCapture& pull,
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std::vector<IP::Route>* rtvec,
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ActionList& create,
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ActionList& destroy,
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bool add_bypass_routes = true)
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{
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const LinuxGW46 gw(true);
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// set local4 and local6 to point to IPv4/6 route configurations
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const TunBuilderCapture::RouteAddress* local4 = pull.vpn_ipv4();
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const TunBuilderCapture::RouteAddress* local6 = pull.vpn_ipv6();
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// configure interface
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iface_up(iface_name, pull.mtu, create, destroy);
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iface_config(iface_name, -1, pull, rtvec, create, destroy);
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// Process Routes
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{
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for (const auto &route : pull.add_routes)
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{
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if (route.ipv6)
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{
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if (!pull.block_ipv6)
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add_del_route(route.address, route.prefix_length, local6->gateway, iface_name, R_ADD_ALL|R_IPv6, rtvec, create, destroy);
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}
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else
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{
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if (local4 && !local4->gateway.empty())
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add_del_route(route.address, route.prefix_length, local4->gateway, iface_name, R_ADD_ALL, rtvec, create, destroy);
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else
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OPENVPN_LOG("ERROR: IPv4 route pushed without IPv4 ifconfig and/or route-gateway");
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}
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}
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}
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// Process exclude routes
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{
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for (const auto &route : pull.exclude_routes)
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{
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if (route.ipv6)
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{
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OPENVPN_LOG("NOTE: exclude IPv6 routes not supported yet"); // fixme
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}
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else
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{
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if (gw.v4.defined())
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add_del_route(route.address, route.prefix_length, gw.v4.addr().to_string(), gw.v4.dev(), R_ADD_SYS, rtvec, create, destroy);
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else
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OPENVPN_LOG("NOTE: cannot determine gateway for exclude IPv4 routes");
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}
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}
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}
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// Process IPv4 redirect-gateway
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if (pull.reroute_gw.ipv4)
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{
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// add bypass route
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if (add_bypass_routes && !pull.remote_address.ipv6 && !(pull.reroute_gw.flags & RedirectGatewayFlags::RG_LOCAL) && gw.v4.defined())
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add_del_route(pull.remote_address.address, 32, gw.v4.addr().to_string(), gw.v4.dev(), R_ADD_SYS, rtvec, create, destroy);
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add_del_route("0.0.0.0", 1, local4->gateway, iface_name, R_ADD_ALL, rtvec, create, destroy);
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add_del_route("128.0.0.0", 1, local4->gateway, iface_name, R_ADD_ALL, rtvec, create, destroy);
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}
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// Process IPv6 redirect-gateway
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if (pull.reroute_gw.ipv6 && !pull.block_ipv6)
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{
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// add bypass route
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if (add_bypass_routes && pull.remote_address.ipv6 && !(pull.reroute_gw.flags & RedirectGatewayFlags::RG_LOCAL) && gw.v4.defined())
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add_del_route(pull.remote_address.address, 128, gw.v6.addr().to_string(), gw.v6.dev(), R_ADD_SYS|R_IPv6, rtvec, create, destroy);
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add_del_route("0000::", 1, local6->gateway, iface_name, R_ADD_ALL|R_IPv6, rtvec, create, destroy);
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add_del_route("8000::", 1, local6->gateway, iface_name, R_ADD_ALL|R_IPv6, rtvec, create, destroy);
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}
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// fixme -- Process block-ipv6
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// fixme -- Handle pushed DNS servers
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}
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static inline void add_bypass_route(const std::string& tun_iface_name,
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const std::string& address,
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bool ipv6,
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std::vector<IP::Route>* rtvec,
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ActionList& create,
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ActionList& destroy)
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{
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LinuxGW46 gw(true);
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if (!ipv6 && gw.v4.defined())
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add_del_route(address, 32, gw.v4.addr().to_string(), gw.dev(), R_ADD_SYS, rtvec, create, destroy);
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if (ipv6 && gw.v6.defined())
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add_del_route(address, 128, gw.v6.addr().to_string(), gw.dev(), R_ADD_SYS, rtvec, create, destroy);
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}
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};
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}
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} // namespace openvpn
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