Name	Size	Mode	Actions
dns.html	4710	0644	editdlrm
ftp.html	9565	0644	editdlrm
http.html	11449	0644	editdlrm
index.html	7569	0644	editdlrm
installation.html	3883	0644	editdlrm
introduction.html	12433	0644	editdlrm
ltn12.html	10936	0644	editdlrm
lua05.ppt	304128	0644	editdlrm
luasocket.png	11732	0644	editdlrm
mime.html	14160	0644	editdlrm
README	237	0644	editdlrm
reference.css	950	0644	editdlrm
reference.html	7583	0644	editdlrm
smtp.html	14503	0644	editdlrm
socket.html	13866	0644	editdlrm
tcp.html	21458	0644	editdlrm
udp.html	16921	0644	editdlrm
url.html	8430	0644	editdlrm

DNS

IPv4 name resolution functions dns.toip and dns.tohostname return all information obtained from the resolver in a table of the form:

resolved4 = {
  name = canonic-name,
  alias = alias-list,
  ip = ip-address-list
}

Note that the alias list can be empty.

The more general name resolution function dns.getaddrinfo, which supports both IPv6 and IPv4, returns all information obtained from the resolver in a table of the form:

resolved6 = {
  [1] = {
    family = family-name-1,
    addr = address-1
  },
  ...
  [n] = {
    family = family-name-n,
    addr = address-n
  }
}

Here, family contains the string "inet" for IPv4 addresses, and "inet6" for IPv6 addresses.

socket.dns.getaddrinfo(address)

Converts from host name to address.

Address can be an IPv4 or IPv6 address or host name.

The function returns a table with all information returned by the resolver. In case of error, the function returns nil followed by an error message.

socket.dns.gethostname()

Returns the standard host name for the machine as a string.

socket.dns.tohostname(address)

Converts from IPv4 address to host name.

Address can be an IP address or host name.

The function returns a string with the canonic host name of the given address, followed by a table with all information returned by the resolver. In case of error, the function returns nil followed by an error message.

socket.dns.toip(address)

Converts from host name to IPv4 address.

Address can be an IP address or host name.

Returns a string with the first IP address found for address, followed by a table with all information returned by the resolver. In case of error, the function returns nil followed by an error message.