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108 lines
2.2 KiB
C++
108 lines
2.2 KiB
C++
#ifndef LIBLLARP_DNS_HPP
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#define LIBLLARP_DNS_HPP
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#include <llarp/dns.h>
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#include <sys/types.h> // for uint & ssize_t
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#include <map>
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#include <string>
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#include <vector>
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#include <sys/socket.h>
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// dnsc can work over any UDP socket
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// however we can't ignore udp->user
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// we need to be able to reference the request (being a request or response)
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// bottom line is we can't use udp->user
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// so we'll need to track all incoming and outgoing requests
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struct dns_tracker
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{
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// uint c_responses;
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uint c_requests;
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// request has to be a pointer
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std::map< uint, dnsc_answer_request * > client_request;
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// FIXME: support multiple dns server contexts
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dnsd_context *dnsd;
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// std::map< uint, dnsd_question_request * > daemon_request;
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};
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// protocol parsing/writing structures & functions
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struct dns_msg_header
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{
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uint16_t id;
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uint8_t qr : 1;
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uint8_t opcode : 4;
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uint8_t aa : 1;
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uint8_t tc : 1;
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uint8_t rd : 1;
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uint8_t ra : 1;
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uint8_t z : 1;
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uint8_t ad : 1;
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uint8_t cd : 1;
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uint8_t rcode : 4;
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uint16_t qdCount;
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uint16_t anCount;
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uint16_t nsCount;
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uint16_t arCount;
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};
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struct dns_msg_question
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{
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std::string name;
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uint16_t type;
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uint16_t qClass;
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};
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struct dns_msg_answer
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{
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std::string name;
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uint16_t type;
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uint16_t aClass;
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uint32_t ttl;
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uint16_t rdLen;
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uint8_t *rData;
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};
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struct dns_packet
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{
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struct dns_msg_header *header;
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std::vector< dns_msg_question * > questions;
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std::vector< dns_msg_answer * > answers;
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std::vector< dns_msg_answer * > auth_rrs;
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std::vector< dns_msg_answer * > additional_rrs;
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};
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extern "C"
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{
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uint16_t
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get16bits(const char *&buffer) throw();
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uint32_t
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get32bits(const char *&buffer) throw();
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dns_msg_header *
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decode_hdr(const char *buffer);
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dns_msg_question *
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decode_question(const char *buffer);
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dns_msg_answer *
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decode_answer(const char *buffer);
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void
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put16bits(char *&buffer, uint16_t value) throw();
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void
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put32bits(char *&buffer, uint32_t value) throw();
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void
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code_domain(char *&buffer, const std::string &domain) throw();
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void
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llarp_handle_dns_recvfrom(struct llarp_udp_io *udp,
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const struct sockaddr *addr, const void *buf,
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ssize_t sz);
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}
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#endif
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