dns_message_firstname
result = dns_message_firstname(msg, DNS_SECTION_ANSWER);
for (result = dns_message_firstname(msg, DNS_SECTION_QUESTION);
for (result = dns_message_firstname(msg, section);
result = dns_message_firstname(msg, DNS_SECTION_ANSWER);
for (result = dns_message_firstname(msg, DNS_SECTION_QUESTION);
result = dns_message_firstname(msg, sectionid);
dns_message_firstname(dns_message_t *msg, dns_section_t section);
result = dns_message_firstname(msg, section);
result = dns_message_firstname(msg, section);
result = dns_message_firstname(msg, section);