lokinet/llarp/config/config.hpp

#pragma once
#include "definition.hpp"
#include "ini.hpp"

#include <llarp/bootstrap.hpp>
#include <llarp/constants/files.hpp>
#include <llarp/crypto/types.hpp>
#include <llarp/dns/srv_data.hpp>
#include <llarp/net/ip_address.hpp>
#include <llarp/net/ip_range_map.hpp>
#include <llarp/net/net.hpp>
#include <llarp/net/net_int.hpp>
#include <llarp/net/traffic_policy.hpp>
#include <llarp/router_contact.hpp>
#include <llarp/service/address.hpp>
#include <llarp/service/auth.hpp>
#include <llarp/util/fs.hpp>
#include <llarp/util/logging.hpp>
#include <llarp/util/str.hpp>

#include <oxenmq/address.h>

#include <chrono>
#include <cstdlib>
#include <functional>
#include <optional>
#include <string>
#include <unordered_set>
#include <utility>
#include <vector>

namespace llarp
{
  using SectionValues = llarp::ConfigParser::SectionValues;
  using ConfigMap = llarp::ConfigParser::ConfigMap;

  inline const std::string QUAD_ZERO{"0.0.0.0"};
  inline constexpr uint16_t DEFAULT_LISTEN_PORT{1090};
  inline constexpr int CLIENT_ROUTER_CONNECTIONS = 4;

  // TODO: don't use these maps. they're sloppy and difficult to follow
  /// Small struct to gather all parameters needed for config generation to reduce the number of
  /// parameters that need to be passed around.
  struct ConfigGenParameters
  {
    ConfigGenParameters() = default;
    virtual ~ConfigGenParameters() = default;

    ConfigGenParameters(const ConfigGenParameters&) = delete;
    ConfigGenParameters(ConfigGenParameters&&) = delete;

    bool is_relay = false;
    fs::path default_data_dir;

    /// get network platform (virtual for unit test mocks)
    virtual const llarp::net::Platform*
    Net_ptr() const = 0;
  };

  struct RouterConfig
  {
    int client_router_connections{CLIENT_ROUTER_CONNECTIONS};

    std::string net_id;

    fs::path data_dir;

    bool block_bogons = false;

    int worker_threads = -1;
    int net_threads = -1;

    size_t job_que_size = 0;

    std::string rc_file;
    std::string enckey_file;
    std::string idkey_file;
    std::string transkey_file;

    bool is_relay = false;

    std::optional<std::string> public_ip;
    std::optional<uint16_t> public_port;

    void
    define_config_options(ConfigDefinition& conf, const ConfigGenParameters& params);
  };

  /// config for path hop selection
  struct PeerSelectionConfig
  {
    /// in our hops what netmask will we use for unique ips for hops
    /// i.e. 32 for every hop unique ip, 24 unique /24 per hop, etc
    ///
    int unique_hop_netmask;

    /// set of countrys to exclude from path building (2 char country code)
    std::unordered_set<std::string> exclude_countries;

    void
    define_config_options(ConfigDefinition& conf, const ConfigGenParameters& params);

    /// return true if this set of router contacts is acceptable against this config
    bool
    check_rcs(const std::set<RemoteRC>& hops) const;
  };

  struct NetworkConfig
  {
    std::optional<bool> enable_profiling;
    bool save_profiles;
    std::set<RouterID> strict_connect;
    std::string if_name;
    IPRange if_addr;

    std::optional<fs::path> keyfile;
    std::string endpoint_type;
    bool is_reachable = false;
    std::optional<int> hops;
    std::optional<int> paths;
    bool allow_exit = false;
    std::set<RouterID> snode_blacklist;
    net::IPRangeMap<service::Address> exit_map;
    net::IPRangeMap<std::string> ons_exit_map;

    std::unordered_map<service::Address, service::AuthInfo> exit_auths;
    std::unordered_map<std::string, service::AuthInfo> ons_exit_auths;

    std::unordered_map<huint128_t, service::Address> map_addrs;

    service::AuthType auth_type = service::AuthType::NONE;
    service::AuthFileType auth_file_type = service::AuthFileType::HASHES;
    std::optional<std::string> auth_url;
    std::optional<std::string> auth_method;
    std::unordered_set<service::Address> auth_whitelist;
    std::unordered_set<std::string> auth_static_tokens;
    std::set<fs::path> auth_files;

    std::vector<llarp::dns::SRVData> srv_records;

    std::optional<huint128_t> base_ipv6_addr;

    std::set<IPRange> owned_ranges;
    std::optional<net::TrafficPolicy> traffic_policy;

    std::optional<llarp_time_t> path_alignment_timeout;

    std::optional<fs::path> addr_map_persist_file;

    bool enable_route_poker;
    bool blackhole_routes;

    void
    define_config_options(ConfigDefinition& conf, const ConfigGenParameters& params);
  };

  struct DnsConfig
  {
    bool raw;
    std::vector<SockAddr> bind_addr;
    std::vector<SockAddr> upstream_dns;
    std::vector<fs::path> hostfiles;
    std::optional<SockAddr> query_bind;

    std::unordered_multimap<std::string, std::string> extra_opts;

    void
    define_config_options(ConfigDefinition& conf, const ConfigGenParameters& params);
  };

  struct LinksConfig
  {
    // DEPRECATED -- use [Router]:public_addr
    std::optional<std::string> public_addr;
    // DEPRECATED -- use [Router]:public_port
    std::optional<uint16_t> public_port;

    std::optional<oxen::quic::Address> listen_addr;

    bool using_user_value = false;
    bool using_new_api = false;

    void
    define_config_options(ConfigDefinition& conf, const ConfigGenParameters& params);
  };

  struct ConnectConfig
  {
    std::vector<fs::path> routers;

    void
    define_config_options(ConfigDefinition& conf, const ConfigGenParameters& params);
  };

  // TODO: remove oxenmq from this header
  struct ApiConfig
  {
    bool enable_rpc_server = false;
    std::vector<oxenmq::address> rpc_bind_addrs;

    void
    define_config_options(ConfigDefinition& conf, const ConfigGenParameters& params);
  };

  struct LokidConfig
  {
    fs::path id_keyfile;
    oxenmq::address rpc_addr;
    bool disable_testing = true;

    void
    define_config_options(ConfigDefinition& conf, const ConfigGenParameters& params);
  };

  struct BootstrapConfig
  {
    std::vector<fs::path> files;
    BootstrapList routers;
    bool seednode;

    void
    define_config_options(ConfigDefinition& conf, const ConfigGenParameters& params);
  };

  struct LoggingConfig
  {
    log::Type type = log::Type::Print;
    log::Level level = log::Level::off;
    std::string file;

    void
    define_config_options(ConfigDefinition& conf, const ConfigGenParameters& params);
  };

  struct Config
  {
    explicit Config(std::optional<fs::path> datadir = std::nullopt);

    virtual ~Config() = default;

    /// create generation params (virtual for unit test mock)
    virtual std::unique_ptr<ConfigGenParameters>
    make_gen_params() const;

    RouterConfig router;
    NetworkConfig network;
    PeerSelectionConfig paths;
    ConnectConfig connect;
    DnsConfig dns;
    LinksConfig links;
    ApiConfig api;
    LokidConfig lokid;
    BootstrapConfig bootstrap;
    LoggingConfig logging;

    // Initialize config definition
    void
    init_config(ConfigDefinition& conf, const ConfigGenParameters& params);

    /// Insert config entries for backwards-compatibility (e.g. so that the config system will
    /// tolerate old values that are no longer accepted)
    ///
    /// @param conf is the config to modify
    void
    add_backcompat_opts(ConfigDefinition& conf);

    // Load a config from the given file if the config file is not provided LoadDefault is called
    bool
    load(std::optional<fs::path> fname = std::nullopt, bool isRelay = false);

    // Load a config from a string of ini, same effects as Config::Load
    bool
    load_string(std::string_view ini, bool isRelay = false);

    std::string
    generate_client_config_base();

    std::string
    generate_router_config_base();

    void
    save();

    void
    override(std::string section, std::string key, std::string value);

    void
    add_default(std::string section, std::string key, std::string value);

    /// create a config with the default parameters for an embedded lokinet
    static std::shared_ptr<Config>
    make_embedded_config();

   private:
    /// Load (initialize) a default config.
    ///
    /// This delegates to the ConfigDefinition to generate a default config,
    /// as though an empty config were specified.
    ///
    /// If using Config without the intention of loading from file (or string), this is necessary
    /// in order to obtain sane defaults.
    ///
    /// @param isRelay determines whether the config will reflect that of a relay or client
    /// @param dataDir is a path representing a directory to be used as the data dir
    /// @return true on success, false otherwise
    bool
    load_default_config(bool isRelay);

    bool
    load_config_data(
        std::string_view ini, std::optional<fs::path> fname = std::nullopt, bool isRelay = false);

    void
    load_overrides(ConfigDefinition& conf) const;

    std::vector<std::array<std::string, 3>> additional;
    ConfigParser parser;
    const fs::path data_dir;
  };

  void
  ensure_config(fs::path dataDir, fs::path confFile, bool overwrite, bool asRouter);

}  // namespace llarp