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85 lines
2.3 KiB
C++
85 lines
2.3 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 "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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/// 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; // pts to udp...
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/// customizable (used for hook (outer request))
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void *user;
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/// storage
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dns_msg_question question;
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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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struct sockaddr result;
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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 *udp,
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const struct sockaddr *saddr, const void *buf,
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ssize_t sz);
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/// generic handler for processing DNS responses
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void
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raw_handle_recvfrom(int *sockfd, const struct sockaddr *saddr, const void *buf,
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ssize_t sz);
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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 server hostname/port to use
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// FIXME: ipv6 it & make it a vector
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sockaddr *server;
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/// 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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};
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/// async resolve a hostname using generic socks
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void
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raw_resolve_host(struct dnsc_context *dnsc, const char *url,
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dnsc_answer_hook_func resolved, void *user);
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/// async resolve a hostname using llarp platform framework
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bool
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llarp_resolve_host(struct dnsc_context *dns, const char *url,
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dnsc_answer_hook_func resolved, void *user);
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/// cleans up request structure allocations
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void
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llarp_host_resolved(dnsc_answer_request *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 *dnsc, struct llarp_udp_io *udp,
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const char *dnsc_hostname, uint16_t dnsc_port);
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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 *dnsc);
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#endif
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