mongoose/docs/c-api/mg_resolv.h/mg_resolve_async_opt.md

title	decl_name	symbol_kind	signature
mg_resolve_async_opt()	mg_resolve_async_opt	func	int mg_resolve_async_opt(struct mg_mgr *mgr, const char *name, int query, mg_resolve_callback_t cb, void *data, struct mg_resolve_async_opts opts);

Resolved a DNS name asynchronously.

Upon successful resolution, the user callback will be invoked with the full DNS response message and a pointer to the user's context data.

In case of timeout while performing the resolution the callback will receive a NULL msg.

The DNS answers can be extracted with mg_next_record and mg_dns_parse_record_data:

[source,c]

struct in_addr ina; struct mg_dns_resource_record *rr = mg_next_record(msg, MG_DNS_A_RECORD, NULL); mg_dns_parse_record_data(msg, rr, &ina, sizeof(ina));