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122 lines
3.5 KiB
C++
122 lines
3.5 KiB
C++
#ifndef LIBLLARP_DNSC_HPP
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#define LIBLLARP_DNSC_HPP
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#include <llarp/ev.h> // for sockaadr
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#include <llarp/dns.hpp> // get protocol structs
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// internal, non-public functions
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// well dnsc init/stop are public...
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struct dnsc_answer_request;
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#define DNC_BUF_SIZE 512
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/// a question to be asked remotely (the actual bytes to send on the wire)
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// header, question
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struct dns_query
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{
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uint16_t length;
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unsigned char request[DNC_BUF_SIZE];
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// char *url;
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// uint16_t reqType;
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};
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struct dns_query *
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build_dns_packet(char *url, uint16_t id, uint16_t reqType);
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/// hook function to handle an dns client request
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// should we pass by llarp::Addr
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// not as long as we're supporting raw
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typedef void (*dnsc_answer_hook_func)(dnsc_answer_request *request);
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/// struct for dns client requests
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struct dnsc_answer_request
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{
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/// sock type
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void *sock; // points to udp that sent the request to DNSc...
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/// customizable (used for hook (outer request))
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void *user;
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/// request storage
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dns_msg_question question;
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/// response storage
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dns_packet packet;
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/// hook
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dnsc_answer_hook_func resolved;
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/// result
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bool found;
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// llarp::huint32_t result;
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// std::string revDNS;
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// a reference to dnsc_context incase of multiple contexts
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struct dnsc_context *context;
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};
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/// event handler for processing DNS responses
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void
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llarp_handle_dnsc_recvfrom(struct llarp_udp_io *const udp,
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const struct sockaddr *addr, const void *buf,
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const ssize_t sz);
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/// generic handler for processing DNS responses
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/// this doesn't look like it exists
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/// that's because raw_resolve_host calls generic_handle_dnsc_recvfrom directly
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/// because we don't need a callback like recvfrom
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/// because we're not evented
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/// however daemon/dns expects this
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/*
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void
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raw_handle_recvfrom(int *sockfd, const struct sockaddr *addr, const void *buf,
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const ssize_t sz);
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*/
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// removed saddr, if needed get through request
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void
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generic_handle_dnsc_recvfrom(dnsc_answer_request *request,
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llarp_buffer_t buffer, dns_msg_header *hdr);
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/// DNS client context (one needed per upstream DNS server)
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struct dnsc_context
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{
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/// Target: DNS servers to use
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std::vector< llarp::Addr > resolvers;
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/// udp tracker
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struct dns_tracker *tracker;
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/// sock type
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void *sock;
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// where to create the new sockets
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struct llarp_udp_io *udp;
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/// We will likely need something for timing events (timeouts)
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struct llarp_logic *logic;
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};
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/// async (blocking w/callback) resolve a hostname using generic socks
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void
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raw_resolve_host(struct dnsc_context *const dnsc, const char *url,
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dnsc_answer_hook_func resolved, void *const user,
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uint16_t type);
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/// async (non blocking w/callback) resolve a hostname using llarp platform
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/// framework
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bool
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llarp_resolve_host(struct dnsc_context *const dns, const char *url,
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dnsc_answer_hook_func resolved, void *const user,
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uint16_t type);
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/// cleans up request structure allocations
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void
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llarp_host_resolved(dnsc_answer_request *const request);
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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_dnsc_init(struct dnsc_context *const dnsc,
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struct llarp_logic *const logic,
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struct llarp_ev_loop *const netloop,
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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_dnsc_stop(struct dnsc_context *const dnsc);
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#endif
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