Re: netsec 682578f 4/6: Add option to bypass NSM TLS checks on local networks

[Eli Zaretskii <eliz@gnu.org>]

> From: Robert Pluim <rpluim@gmail.com>
> Date: Mon, 16 Jul 2018 15:34:35 +0200
> Cc: emacs-devel@gnu.org
> 
> Eli, I see thereʼs a sys_getaddrinfo in w32.c, is something needed
> to get emacs to use that on MS-Windows?

No, you don't need anything special.  nt/inc/socket.h redirects
getaddrinfo into sys_getaddrinfo, and all our C sources see the
redirection.

> +DEFUN ("get-address-info", Fget_address_info, Sget_address_info, 1, 2, 0,
> +       doc: /* Look up ip address info of NAME.
> +Optional parameter FAMILY controls whether to look up IPv4 or IPv6
> +addresses.  The default of nil means look up both, symbol `ipv4' means
> +IPv4 only, symbol `ipv6' mean IPv6 only.  Returns a list of addresses,
> +or nil if none were found.  */)

This doc string doesn't tell that each address is a vector or a
string.

> +  if (EQ (family, Qipv4))
> +    hints.ai_family = AF_INET;
> +#ifdef AF_INET6
> +  if (EQ (family, Qipv6))
> +    hints.ai_family = AF_INET6;
> +#endif

Should we signal an error if 'ipv6' is requested on a system that
doesn't support that?

> +  ret = getaddrinfo (SSDATA (name), NULL, &hints, &res);

You should encode NAME (using ENCODE_SYSTEM), because it could include
non-ASCII characters.  In general, any Lisp string should be encoded
before you can pass its data to a C library function.

Thanks.

P.S. This needs a NEWS entry, at the very least, and perhaps also an
update for the ELisp manual.