Networking/NameResolution

Domain Name System

Resolving using getaddrinfo() in applications

The getaddrinfo() function is a dualstack-friendly API to name resolution. It is used by applications to translate host and service names to a linked list of struct addrinfo objects.

And example of getaddrinfo() call:

const char *node = "www.fedoraproject.org";
const char *service = "http";
struct addrinfo hints = {
    .ai_family = AF_UNSPEC,
    .ai_socktype = SOCK_DGRAM,
    .ai_flags = 0,
    .ai_protocol = 0,
    .ai_canonname = NULL,
    .ai_addr = NULL,
    .ai_next = NULL
};
struct addrinfo *result;
int error;

error = getaddrinfo(node, service, &hints, &result)