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
@@ -0,0 +1,374 @@
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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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// DNS utilities for Mac OS X.
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#ifndef OPENVPN_TUN_MAC_MACDNS_H
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#define OPENVPN_TUN_MAC_MACDNS_H
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#include <string>
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#include <sstream>
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#include <memory>
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#include <openvpn/common/size.hpp>
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#include <openvpn/common/exception.hpp>
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#include <openvpn/common/string.hpp>
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#include <openvpn/common/process.hpp>
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#include <openvpn/apple/macver.hpp>
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#include <openvpn/apple/scdynstore.hpp>
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#include <openvpn/apple/cf/cfhelper.hpp>
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#include <openvpn/tun/builder/capture.hpp>
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#include <openvpn/tun/mac/dsdict.hpp>
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namespace openvpn {
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class MacDNS : public RC<thread_unsafe_refcount>
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{
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class Info;
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public:
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typedef RCPtr<MacDNS> Ptr;
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OPENVPN_EXCEPTION(macdns_error);
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class Config : public RC<thread_safe_refcount>
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{
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public:
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typedef RCPtr<Config> Ptr;
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Config()
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{
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}
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Config(const TunBuilderCapture& settings)
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: dns_servers(get_dns_servers(settings)),
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search_domains(get_search_domains(settings)),
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adapter_domain_suffix(settings.adapter_domain_suffix)
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{
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// We redirect DNS if either of the following is true:
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// 1. redirect-gateway (IPv4) is pushed, or
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// 2. DNS servers are pushed but no search domains are pushed
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redirect_dns = settings.reroute_gw.ipv4 || (CF::array_len(dns_servers) && !CF::array_len(search_domains));
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}
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std::string to_string() const
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{
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std::ostringstream os;
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os << "RD=" << redirect_dns;
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os << " SO=" << search_order;
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os << " DNS=" << CF::array_to_string(dns_servers);
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os << " DOM=" << CF::array_to_string(search_domains);
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os << " ADS=" << adapter_domain_suffix;
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return os.str();
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}
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bool redirect_dns = false;
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int search_order = 5000;
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CF::Array dns_servers;
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CF::Array search_domains;
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std::string adapter_domain_suffix;
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private:
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static CF::Array get_dns_servers(const TunBuilderCapture& settings)
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{
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CF::MutableArray ret(CF::mutable_array());
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for (std::vector<TunBuilderCapture::DNSServer>::const_iterator i = settings.dns_servers.begin();
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i != settings.dns_servers.end(); ++i)
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{
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const TunBuilderCapture::DNSServer& ds = *i;
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CF::array_append_str(ret, ds.address);
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}
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return CF::const_array(ret);
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}
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static CF::Array get_search_domains(const TunBuilderCapture& settings)
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{
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CF::MutableArray ret(CF::mutable_array());
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for (std::vector<TunBuilderCapture::SearchDomain>::const_iterator i = settings.search_domains.begin();
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i != settings.search_domains.end(); ++i)
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{
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const TunBuilderCapture::SearchDomain& sd = *i;
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CF::array_append_str(ret, sd.domain);
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}
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return CF::const_array(ret);
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}
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};
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MacDNS(const std::string& sname_arg)
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: sname(sname_arg)
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{
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}
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void flush_cache()
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{
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const int v = ver.major();
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if (v < Mac::Version::OSX_10_6)
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OPENVPN_LOG("MacDNS: Error: No support for Mac OS X versions earlier than 10.6");
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if (v == Mac::Version::OSX_10_6 || v >= Mac::Version::OSX_10_9)
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{
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Argv args;
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args.push_back("/usr/bin/dscacheutil");
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args.push_back("-flushcache");
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OPENVPN_LOG(args.to_string());
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system_cmd(args);
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}
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if (v >= Mac::Version::OSX_10_7)
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{
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Argv args;
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args.push_back("/usr/bin/killall");
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args.push_back("-HUP");
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args.push_back("mDNSResponder");
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OPENVPN_LOG(args.to_string());
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system_cmd(args);
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}
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}
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bool signal_network_reconfiguration()
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{
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return DSDict::signal_network_reconfiguration(sname);
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}
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bool setdns(const Config& config)
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{
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bool mod = false;
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try {
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CF::DynamicStore sc = ds_create();
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Info::Ptr info(new Info(sc, sname));
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// cleanup settings applied to previous interface
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interface_change_cleanup(info.get());
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if (config.redirect_dns)
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{
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// redirect all DNS
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info->dns.will_modify();
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// set DNS servers
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if (CF::array_len(config.dns_servers))
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{
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info->dns.backup_orig("ServerAddresses");
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CF::dict_set_obj(info->dns.mod, "ServerAddresses", config.dns_servers());
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}
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// set search domains
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info->dns.backup_orig("SearchDomains");
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CF::MutableArray search_domains(CF::mutable_array());
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// add adapter_domain_suffix to SearchDomains for domain autocompletion
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if (config.adapter_domain_suffix.length() > 0)
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CF::array_append_str(search_domains, config.adapter_domain_suffix);
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if (CF::array_len(search_domains))
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CF::dict_set_obj(info->dns.mod, "SearchDomains", search_domains());
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// set search order
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info->dns.backup_orig("SearchOrder");
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CF::dict_set_int(info->dns.mod, "SearchOrder", config.search_order);
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// push it
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mod |= info->dns.push_to_store();
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}
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else
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{
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// split-DNS - resolve only specific domains
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info->ovpn.mod_reset();
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if (CF::array_len(config.dns_servers) && CF::array_len(config.search_domains))
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{
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// set DNS servers
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CF::dict_set_obj(info->ovpn.mod, "ServerAddresses", config.dns_servers());
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// DNS will be used only for those domains
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CF::dict_set_obj(info->ovpn.mod, "SupplementalMatchDomains", config.search_domains());
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// do not use those domains in autocompletion
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CF::dict_set_int(info->ovpn.mod, "SupplementalMatchDomainsNoSearch", 1);
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}
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// in case of split-DNS macOS uses domain suffix of network adapter,
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// not the one provided by VPN (which we put to SearchDomains)
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// push it
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mod |= info->ovpn.push_to_store();
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}
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if (mod)
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{
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// As a backup, save PrimaryService in private dict (if network goes down while
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// we are set, we can lose info about PrimaryService in State:/Network/Global/IPv4
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// and be unable to reset ourselves).
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const CFTypeRef ps = CF::dict_get_obj(info->ipv4.dict, "PrimaryService");
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if (ps)
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{
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info->info.mod_reset();
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CF::dict_set_obj(info->info.mod, "PrimaryService", ps);
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info->info.push_to_store();
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}
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}
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prev = info;
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if (mod)
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OPENVPN_LOG("MacDNS: SETDNS " << ver.to_string() << std::endl << info->to_string());
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}
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catch (const std::exception& e)
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{
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OPENVPN_LOG("MacDNS: setdns exception: " << e.what());
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}
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return mod;
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}
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bool resetdns()
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{
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bool mod = false;
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try {
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CF::DynamicStore sc = ds_create();
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Info::Ptr info(new Info(sc, sname));
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// cleanup settings applied to previous interface
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interface_change_cleanup(info.get());
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// undo primary dns changes
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mod |= reset_primary_dns(info.get());
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// undo non-redirect-gateway changes
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if (CF::dict_len(info->ovpn.dict))
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mod |= info->ovpn.remove_from_store();
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// remove private info dict
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if (CF::dict_len(info->info.dict))
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mod |= info->info.remove_from_store();
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if (mod)
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OPENVPN_LOG("MacDNS: RESETDNS " << ver.to_string() << std::endl << info->to_string());
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}
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catch (const std::exception& e)
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{
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OPENVPN_LOG("MacDNS: resetdns exception: " << e.what());
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}
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return mod;
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}
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std::string to_string() const
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{
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CF::DynamicStore sc = ds_create();
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Info::Ptr info(new Info(sc, sname));
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return info->to_string();
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}
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CF::Array dskey_array() const
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{
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CF::DynamicStore sc = ds_create();
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Info::Ptr info(new Info(sc, sname));
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CF::MutableArray ret(CF::mutable_array());
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CF::array_append_str(ret, info->ipv4.dskey);
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CF::array_append_str(ret, info->info.dskey);
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CF::array_append_str(ret, info->ovpn.dskey);
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CF::array_append_str(ret, info->dns.dskey);
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return CF::const_array(ret);
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}
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private:
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void interface_change_cleanup(Info* info)
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{
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if (info->interface_change(prev.get()))
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{
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reset_primary_dns(prev.get());
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prev.reset();
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}
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}
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bool reset_primary_dns(Info* info)
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{
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bool mod = false;
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if (info)
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{
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#if 1
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// Restore previous DNS settings.
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// Recommended for production.
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info->dns.will_modify();
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info->dns.restore_orig();
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mod |= info->dns.push_to_store();
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#else
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// Wipe DNS settings without restore.
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// This can potentially wipe static IP/DNS settings.
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info->dns.mod_reset();
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mod |= info->dns.push_to_store();
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#endif
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}
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return mod;
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}
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class Info : public RC<thread_unsafe_refcount>
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{
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public:
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typedef RCPtr<Info> Ptr;
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Info(CF::DynamicStore& sc, const std::string& sname)
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: ipv4(sc, sname, "State:/Network/Global/IPv4"),
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info(sc, sname, "State:/Network/Service/" + sname + "/Info"),
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ovpn(sc, sname, "State:/Network/Service/" + sname + "/DNS"),
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dns(sc, sname, primary_dns(ipv4.dict, info.dict))
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{
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}
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std::string to_string() const
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{
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std::ostringstream os;
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os << ipv4.to_string();
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os << info.to_string();
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os << ovpn.to_string();
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os << dns.to_string();
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return os.str();
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}
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bool interface_change(Info* other) const
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{
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return other && dns.dskey != other->dns.dskey;
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}
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DSDict ipv4;
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DSDict info; // we may modify
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DSDict ovpn; // we may modify
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DSDict dns; // we may modify
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private:
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static std::string primary_dns(const CF::Dict& ipv4, const CF::Dict& info)
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{
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std::string serv = CF::dict_get_str(ipv4, "PrimaryService");
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if (serv.empty())
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serv = CF::dict_get_str(info, "PrimaryService");
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if (serv.empty())
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throw macdns_error("no primary service");
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return "Setup:/Network/Service/" + serv + "/DNS";
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}
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};
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CF::DynamicStore ds_create() const
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{
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return DSDict::ds_create(sname);
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}
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const std::string sname;
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Mac::Version ver;
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Info::Ptr prev;
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};
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}
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#endif
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