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40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
#pragma once
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#include "net.h"
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#include "str.h"
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// Mongoose sends DNS queries that contain only one question:
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// either A (IPv4) or AAAA (IPv6) address lookup.
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// Therefore, we expect zero or one answer.
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// If `resolved` is true, then `addr` contains resolved IPv4 or IPV6 address.
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struct mg_dns_message {
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uint16_t txnid; // Transaction ID
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bool resolved; // Resolve successful, addr is set
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struct mg_addr addr; // Resolved address
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char name[256]; // Host name
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};
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struct mg_dns_header {
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uint16_t txnid; // Transaction ID
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uint16_t flags;
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uint16_t num_questions;
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uint16_t num_answers;
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uint16_t num_authority_prs;
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uint16_t num_other_prs;
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};
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// DNS resource record
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struct mg_dns_rr {
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uint16_t nlen; // Name or pointer length
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uint16_t atype; // Address type
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uint16_t aclass; // Address class
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uint16_t alen; // Address length
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};
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void mg_resolve(struct mg_connection *, struct mg_str *, int);
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void mg_resolve_cancel(struct mg_connection *);
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bool mg_dns_parse(const uint8_t *buf, size_t len, struct mg_dns_message *);
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size_t mg_dns_parse_rr(const uint8_t *buf, size_t len, size_t ofs,
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bool is_question, struct mg_dns_rr *);
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size_t mg_dns_decode_name(const uint8_t *, size_t, size_t, char *, size_t);
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