/* minimal CoAP functions
 *
 * Copyright (C) 2018-2021 Olaf Bergmann <bergmann@tzi.org>
 */

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>

#include "common.h"

int
resolve_address(const char *host, const char *service, coap_address_t *dst) {

  struct addrinfo *res, *ainfo;
  struct addrinfo hints;
  int error, len=-1;

  memset(&hints, 0, sizeof(hints));
  memset(dst, 0, sizeof(*dst));
  hints.ai_socktype = SOCK_DGRAM;
  hints.ai_family = AF_UNSPEC;

  error = getaddrinfo(host, service, &hints, &res);

  if (error != 0) {
    fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(error));
    return error;
  }

  for (ainfo = res; ainfo != NULL; ainfo = ainfo->ai_next) {
    switch (ainfo->ai_family) {
    case AF_INET6:
    case AF_INET:
      len = dst->size = ainfo->ai_addrlen;
      memcpy(&dst->addr.sin6, ainfo->ai_addr, dst->size);
      goto finish;
    default:
      ;
    }
  }

 finish:
  freeaddrinfo(res);
  return len;
}