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60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
#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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#ifndef _WIN32
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#include <net/if.h>
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#endif
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namespace llarp::dns
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{
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/// sets dns settings in a platform dependant way
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class I_Platform
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{
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public:
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virtual ~I_Platform() = 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_index -- the interface index to which we add the DNS servers, this can be gotten
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/// from the interface name e.g. lokitun0 (Typically tun_endpoint.GetIfName().) and then put
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/// through if_nametoindex().
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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(unsigned int if_index, llarp::SockAddr dns, bool global) = 0;
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};
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/// a dns platform does silently does nothing, successfully
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class Null_Platform : public I_Platform
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{
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public:
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~Null_Platform() override = default;
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void
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set_resolver(unsigned int, llarp::SockAddr, bool) override
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{}
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};
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/// a collection of dns platforms that are tried in order when setting dns
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class Multi_Platform : public I_Platform
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{
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std::vector<std::unique_ptr<I_Platform>> m_Impls;
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public:
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~Multi_Platform() override = default;
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/// add a platform to be owned
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void
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add_impl(std::unique_ptr<I_Platform> impl);
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/// try all owned platforms to set the resolver, throws if none of them work
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void
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set_resolver(unsigned int if_index, llarp::SockAddr dns, bool global) override;
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};
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} // namespace llarp::dns
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