mongoose/docs/c-api/dns.h/mg_set_protocol_dns.md

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---
title: "mg_set_protocol_dns()"
decl_name: "mg_set_protocol_dns"
symbol_kind: "func"
signature: |
void mg_set_protocol_dns(struct mg_connection *nc);
---
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Attaches a built-in DNS event handler to the given listening connection.
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The DNS event handler parses the incoming UDP packets, treating them as DNS
requests. If an incoming packet gets successfully parsed by the DNS event
handler, a user event handler will receive an `MG_DNS_REQUEST` event, with
`ev_data` pointing to the parsed `struct mg_dns_message`.
See
[captive_dns_server](https://github.com/cesanta/mongoose/tree/master/examples/captive_dns_server)
example on how to handle DNS request and send DNS reply.