mirror of https://github.com/oxen-io/lokinet
restucture dbus parts
* move dbus into llarp/linux/dbus.hpp and llarp/linux/dbus.cpp * provide platform abstraction for setting dns in preparation for network managerpull/1969/head
Jeff
2 years ago
committed by
Jeff Becker
parent
2d586145ee
commit
253d22db4f
@ -1,21 +1,59 @@
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#pragma once
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#include <string>
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#include <memory>
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#include <llarp/net/sock_addr.hpp>
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#include <llarp/util/logging.hpp>
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#include <stdexcept>
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namespace llarp
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{
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struct AbstractRouter;
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}
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namespace llarp::dns
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{
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/// Attempts to set lokinet as the DNS server for systemd-resolved.
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/// Returns true if successful, false if unsupported or fails.
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///
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/// If systemd support is enabled it will attempt via dbus call to system-resolved
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/// When compiled without systemd support this always return false without doing anything.
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///
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/// \param if_name -- the interface name to which we add the DNS servers, e.g. lokitun0.
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/// Typically tun_endpoint.GetIfName().
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/// \param dns -- the listening address of the lokinet DNS server
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/// \param global -- whether to set up lokinet for all DNS queries (true) or just .loki & .snode
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/// addresses (false).
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bool
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set_resolver(std::string if_name, llarp::SockAddr dns, bool global);
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/// sets dns settings in a platform dependant way
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class I_SystemSettings
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{
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public:
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virtual ~I_SystemSettings() = default;
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/// Attempts to set lokinet as the DNS server.
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/// throws if unsupported or fails.
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///
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///
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/// \param if_name -- the interface name to which we add the DNS servers, e.g. lokitun0.
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/// Typically tun_endpoint.GetIfName().
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/// \param dns -- the listening address of the lokinet DNS server
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/// \param global -- whether to set up lokinet for all DNS queries (true) or just .loki & .snode
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/// addresses (false).
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virtual void
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set_resolver(std::string if_name, llarp::SockAddr dns, bool global) = 0;
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};
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/// creates for the current platform
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std::shared_ptr<I_SystemSettings>
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MakeSystemSettings();
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/// compat wrapper
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inline bool
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set_resolver(std::string if_name, llarp::SockAddr dns, bool global)
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{
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try
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{
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if (auto settings = MakeSystemSettings())
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{
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settings->set_resolver(std::move(if_name), std::move(dns), global);
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return true;
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}
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}
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catch (std::exception& ex)
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{
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LogError("failed to set DNS: ", ex.what());
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}
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LogWarn("did not set dns");
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return false;
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}
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} // namespace llarp::dns
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@ -0,0 +1,26 @@
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#ifdef WITH_SYSTEMD
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#include "dbus.hpp"
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namespace llarp::linux
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{
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system_bus_exception::system_bus_exception(int err)
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: std::runtime_error{"cannot connect to system bus: " + std::string{strerror(-err)}}
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{}
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dbus_call_exception::dbus_call_exception(std::string meth, int err)
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: std::runtime_error{
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"failed to call dbus function '" + meth + "': " + std::string{strerror(-err)}}
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{}
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DBUS::DBUS(std::string _interface, std::string _instance, std::string _call)
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: m_interface{std::move(_interface)}
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, m_instance{std::move(_instance)}
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, m_call{std::move(_call)}
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{
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sd_bus* bus{nullptr};
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if (auto err = sd_bus_open_system(&bus); err < 0)
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throw system_bus_exception{err};
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m_ptr.reset(bus);
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}
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} // namespace llarp::linux
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#endif
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@ -0,0 +1,69 @@
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#pragma once
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extern "C"
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{
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#include <systemd/sd-bus.h>
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}
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#include <memory>
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#include <stdexcept>
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#include <string>
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namespace llarp::linux
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{
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/// exception for connecting to system bus
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class system_bus_exception : public std::runtime_error
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{
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public:
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explicit system_bus_exception(int err);
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};
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/// exception for a failed calling of a dbus method
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class dbus_call_exception : public std::runtime_error
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{
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public:
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explicit dbus_call_exception(std::string meth, int err);
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};
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class DBUS
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{
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struct sd_bus_deleter
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{
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void
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operator()(sd_bus* ptr) const
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{
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sd_bus_unref(ptr);
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}
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};
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std::unique_ptr<sd_bus, sd_bus_deleter> m_ptr;
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const std::string m_interface;
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const std::string m_instance;
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const std::string m_call;
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public:
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DBUS(std::string _interface, std::string _instance, std::string _call);
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template <typename... T>
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void
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operator()(std::string method, const char* arg_format, T... args)
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{
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sd_bus_error error = SD_BUS_ERROR_NULL;
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sd_bus_message* msg = nullptr;
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auto r = sd_bus_call_method(
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m_ptr.get(),
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m_interface.c_str(),
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m_instance.c_str(),
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m_call.c_str(),
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method.c_str(),
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&error,
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&msg,
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arg_format,
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args...);
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if (r < 0)
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throw dbus_call_exception{std::move(method), r};
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sd_bus_message_unref(msg);
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sd_bus_error_free(&error);
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}
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};
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} // namespace llarp::linux
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