254 lines
8.1 KiB
C
254 lines
8.1 KiB
C
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#pragma once
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#include <memory>
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#include <string>
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#include <cstdint>
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#include <vector>
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#ifdef WIN32
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#include <WinSock2.h>
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#include <Windows.h>
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#include <WinDNS.h>
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#else
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#include <netinet/in.h>
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#endif
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#include "./types.h"
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struct in6_addr;
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namespace tc::dns {
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namespace response {
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class DNSHeader;
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class DNSQuery;
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class DNSResourceRecords;
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}
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class DNSResponse;
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struct DNSResponseData;
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struct DNSResponseData {
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#ifdef WIN32
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bool wide_string{false};
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DNS_QUERY_RESULT data{};
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#else
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uint8_t* buffer{nullptr};
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size_t length{0};
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std::string parse_dns_dn(std::string& /* error */, size_t& /* index */, bool /* compression allowed */);
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#endif
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~DNSResponseData();
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};
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class DNSResponse {
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friend class Resolver;
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public:
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typedef std::vector<std::shared_ptr<response::DNSResourceRecords>> rr_list_t;
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typedef std::vector<std::shared_ptr<response::DNSQuery>> q_list_t;
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DNSResponse(const DNSResponse&) = delete;
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DNSResponse(DNSResponse&&) = delete;
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bool parse(std::string& /* error */);
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#ifndef WIN32
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[[nodiscard]] inline const std::string why_bogus() const { return this->bogus; }
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[[nodiscard]] inline const uint8_t* packet_data() const { return this->data->buffer; }
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[[nodiscard]] inline size_t packet_length() const { return this->data->length; }
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[[nodiscard]] inline bool is_secure() const { return this->secure_state > 0; }
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[[nodiscard]] inline bool is_secure_dnssec() const { return this->secure_state == 2; }
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[[nodiscard]] response::DNSHeader header() const;
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#endif
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[[nodiscard]] q_list_t queries() const { return this->parsed_queries; }
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[[nodiscard]] rr_list_t answers() const { return this->parsed_answers; }
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[[nodiscard]] rr_list_t authorities() const { return this->parsed_authorities; }
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[[nodiscard]] rr_list_t additionals() const { return this->parsed_additionals; }
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private:
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#ifndef WIN32
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DNSResponse(uint8_t /* secure state */, const char* /* bogus */, void* /* packet */, size_t /* length */);
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std::shared_ptr<response::DNSResourceRecords> parse_rr(std::string& /* error */, size_t& index, bool /* compression allowed dn */);
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std::string bogus;
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uint8_t secure_state{0};
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#else
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DNSResponse(std::shared_ptr<DNSResponseData>);
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#endif
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std::shared_ptr<DNSResponseData> data{nullptr};
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bool is_parsed{false};
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std::string parse_error{};
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q_list_t parsed_queries;
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rr_list_t parsed_answers;
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rr_list_t parsed_authorities;
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rr_list_t parsed_additionals;
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};
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namespace response {
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#ifndef WIN32
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class DNSHeader {
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friend class tc::dns::DNSResponse;
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public:
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[[nodiscard]] inline size_t id() const { return this->field(0); }
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[[nodiscard]] inline bool is_answer() const { return this->field(1) & 0x1UL; }
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[[nodiscard]] inline bool is_authoritative_answer() const { return (uint8_t) ((this->field(1) >> 5UL) & 0x01UL); }
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[[nodiscard]] inline bool is_truncation() const { return (uint8_t) ((this->field(1) >> 6UL) & 0x01UL); }
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[[nodiscard]] inline bool is_recursion_desired() const { return (uint8_t) ((this->field(1) >> 7UL) & 0x01UL); }
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[[nodiscard]] inline bool is_recursion_available() const { return (uint8_t) ((this->field(1) >> 8UL) & 0x01UL); }
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[[nodiscard]] inline uint8_t query_type() const { return (uint8_t) ((this->field(1) >> 1UL) & 0x07UL); }
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[[nodiscard]] inline uint8_t response_code() const { return (uint8_t) ((this->field(1) >> 12UL) & 0x07UL); }
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[[nodiscard]] inline uint16_t query_count() const { return ntohs(this->field(2)); }
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[[nodiscard]] inline uint16_t answer_count() const { return ntohs(this->field(3)); }
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[[nodiscard]] inline uint16_t authority_count() const { return ntohs(this->field(4)); }
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[[nodiscard]] inline uint16_t additional_count() const { return htons(this->field(5)); }
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private:
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[[nodiscard]] uint16_t field(int index) const;
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explicit DNSHeader(const DNSResponse* response) : response{response} {}
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const DNSResponse* response{nullptr};
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};
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#endif
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class DNSQuery {
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friend class tc::dns::DNSResponse;
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public:
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[[nodiscard]] inline std::string qname() const { return this->name; }
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[[nodiscard]] inline rrtype::value qtype() const { return this->type; }
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[[nodiscard]] inline rrclass::value qclass() const { return this->klass; }
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private:
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DNSQuery(std::string name, rrtype::value type, rrclass::value klass) : name{std::move(name)}, type{type}, klass{klass} {}
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std::string name;
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rrtype::value type;
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rrclass::value klass;
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};
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class DNSResourceRecords {
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friend class tc::dns::DNSResponse;
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public:
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[[nodiscard]] inline std::string qname() const {
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#ifdef WIN32
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return std::string{this->nrecord->pName};
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#else
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return this->name;
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#endif
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}
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[[nodiscard]] inline rrtype::value atype() const {
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#ifdef WIN32
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return static_cast<rrtype::value>(this->nrecord->wType);
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#else
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return this->type;
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#endif
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}
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[[nodiscard]] inline rrclass::value aclass() const {
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#ifdef WIN32
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return static_cast<rrclass::value>(1);
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#else
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return this->klass;
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#endif
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}
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[[nodiscard]] inline uint16_t attl() const {
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#ifdef WIN32
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return (uint16_t) this->nrecord->dwTtl;
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#else
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return this->ttl;
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#endif
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}
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#ifndef WIN32
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[[nodiscard]] const uint8_t* payload_data() const;
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[[nodiscard]] inline size_t payload_length() const { return this->length; }
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[[nodiscard]] inline size_t payload_offset() const { return this->offset; }
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#else
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[[nodiscard]] inline PDNS_RECORDA native_record() const { return this->nrecord; }
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[[nodiscard]] bool is_wide_string() const;
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#endif
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[[nodiscard]] inline std::shared_ptr<DNSResponseData> dns_data() const {
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return this->data;
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}
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template <typename T>
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[[nodiscard]] inline T parse() const {
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if(T::type != this->atype())
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throw std::logic_error{"parser type mismatch"};
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return T{this};
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}
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private:
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std::shared_ptr<DNSResponseData> data{nullptr};
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#ifdef WIN32
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DNSResourceRecords(std::shared_ptr<DNSResponseData>, PDNS_RECORDA);
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PDNS_RECORDA nrecord{nullptr};
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#else
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DNSResourceRecords(std::shared_ptr<DNSResponseData>, size_t, size_t, uint32_t, std::string , rrtype::value, rrclass::value);
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size_t offset{0};
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size_t length{0};
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uint32_t ttl;
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std::string name;
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rrtype::value type;
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rrclass::value klass;
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#endif
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};
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namespace rrparser {
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struct base {
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protected:
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explicit base(const DNSResourceRecords* handle) : handle{handle} {}
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const DNSResourceRecords* handle{nullptr};
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};
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struct named_base : public base {
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public:
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[[nodiscard]] bool is_valid();
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[[nodiscard]] std::string name();
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protected:
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explicit named_base(const DNSResourceRecords* handle) : base{handle} {}
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};
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#define define_parser(name, base, ...) \
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struct name : public base { \
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friend class response::DNSResourceRecords; \
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public: \
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static constexpr auto type = rrtype::name; \
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__VA_ARGS__ \
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private: \
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explicit name(const DNSResourceRecords* handle) : base{handle} {} \
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}
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define_parser(A, base,
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[[nodiscard]] bool is_valid();
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[[nodiscard]] std::string address_string();
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[[nodiscard]] in_addr address();
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);
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define_parser(AAAA, base,
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[[nodiscard]] bool is_valid();
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[[nodiscard]] std::string address_string();
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[[nodiscard]] in6_addr address();
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);
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define_parser(SRV, base,
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[[nodiscard]] bool is_valid();
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[[nodiscard]] uint16_t priority();
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[[nodiscard]] uint16_t weight();
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[[nodiscard]] uint16_t target_port();
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[[nodiscard]] std::string target_hostname();
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);
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define_parser(CNAME, named_base);
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};
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}
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}
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