krb5_sendto_kdc
ret = krb5_sendto_kdc(context, &data, &r, &data2);
ret = krb5_sendto_kdc (context, &req, &creds->client->realm, &resp);
krb5_sendto_kdc (
krb5_error_code krb5_sendto_kdc(krb5_context, const krb5_data *,
code = krb5_sendto_kdc(ctx->k5c, &request, &realm,