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125 lines
3.4 KiB
C++
125 lines
3.4 KiB
C++
#ifndef LIBLLARP_DNSD_HPP
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#define LIBLLARP_DNSD_HPP
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#include <ev.h> // for sockaadr
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#include <dns.hpp> // question and dnsc
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#include <dnsc.hpp>
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#include <string>
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//
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// Input structures/functions:
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//
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// fwd declaration
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struct dnsd_context;
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/// sendto hook functor
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using sendto_dns_hook_func = std::function< ssize_t(
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void *sock, const struct sockaddr *from, llarp_buffer_t) >;
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// FIXME: llarp::Addr
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/// DNS server query request
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struct dnsd_question_request
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{
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/// sock type
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void *user;
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// raw or llarp subsystem (is this used? does this matter?)
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bool llarp;
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/// request header
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dns_msg_header hdr;
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/// question being asked
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dns_msg_question question;
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// request source socket
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struct sockaddr *from; // FIXME: convert to llarp::Addr
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sendto_dns_hook_func sendto_hook; // sendto hook tbh
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// maybe a reference to dnsd_context incase of multiple
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dnsd_context *context; // or you can access it via user (udp)
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};
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// FIXME: made better as a two way structure, collapse the request and response
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// together
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struct dnsd_query_hook_response
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{
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/// turn off communication
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bool dontSendResponse;
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/// turn off recursion
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bool dontLookUp;
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/// potential address
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llarp::huint32_t returnThis;
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};
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/// builds and fires a request based based on llarp_udp_io udp event
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/// called by the llarp_handle_dns_recvfrom generic (dnsd/dnsc) handler in dns
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void
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llarp_handle_dnsd_recvfrom(struct llarp_udp_io *udp,
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const struct sockaddr *addr, llarp_buffer_t buf);
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//
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// output structures/functions:
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//
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// we may want to pass dnsd_question_request to these,
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// incase we need to send an error back up through the pipeline
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// FIXME: just use the from in the request
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/// NXDOMAIN not found
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void
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write404_dnss_response(const dnsd_question_request *request);
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/// for hook functions to use
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void
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writecname_dnss_response(std::string cname,
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const dnsd_question_request *request);
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// FIXME: llarp::Addr
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/// send an A record found response
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void
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writesend_dnss_response(llarp::huint32_t *hostRes,
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const dnsd_question_request *request);
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// FIXME: llarp::Addr
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/// send an PTR record found response
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void
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writesend_dnss_revresponse(std::string reverse,
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const dnsd_question_request *request);
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// FIXME: llarp::Addr
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//
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// setup/teardown functions/structure:
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//
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/// intercept query hook functor
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using intercept_query_hook = std::function< dnsd_query_hook_response *(
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std::string name, const dnsd_question_request *request) >;
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// FIXME: llarp::Addr
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/// DNS Server context
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struct dnsd_context
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{
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/// DNS daemon socket to listen on
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struct llarp_udp_io udp;
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/// udp tracker
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struct dns_tracker *tracker;
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/// upstream DNS client context to use
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dnsc_context client;
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/// custom data for intercept query hook (used for configuration of hook)
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void *user;
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/// hook function for intercepting dns requests
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intercept_query_hook intercept;
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};
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/// initialize dns subsystem and bind socket
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/// returns true on bind success otherwise returns false
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bool
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llarp_dnsd_init(struct dnsd_context *const dnsd, llarp::Logic *const logic,
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struct llarp_ev_loop *const netloop,
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const llarp::Addr &dnsd_sockaddr,
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const llarp::Addr &dnsc_sockaddr);
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/// shutdowns any events, and deallocates for this context
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bool
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llarp_dnsd_stop(struct dnsd_context *const dnsd);
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#endif
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