From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <365a3b8e0ce821506adb926ac1001503@plan9.jp>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] csipinfo
From: Joel “chesky” Salomon <chesky@plan9.jp>
Date: Wed, 18 Oct 2006 15:38:56 -0400
In-Reply-To: <08660eafbf4cef501efcf7a33fe5d3d2@vitanuova.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Topicbox-Message-UUID: ccee3bb6-ead1-11e9-9d60-3106f5b1d025

> > Thanks, this finally looks like what I need.
>=20
> it won't work. something like the code i posted is needed.

I=E2=80=99m trying to read the limbo code and translate it to my needs; b=
ear with me as I translate this to c-ish pseudocode:

char*
gethostbyaddr(char *net, char *addr)
{
	char buf[1024], *dq[4], s;
	int fd, l;

	if(net =3D=3D nil)
		net =3D "/net";
	snprint(buf, sizeof buf, "%s/dns", net);
	if((fd =3D open(buf, ORDWR)) < 0)
		return nil;		// set errstr "gethostbyaddr failed: can't open %s: %r", b=
uf)
	dq[0] =3D strtok(addr, ".");	// neglecting error checking
	dq[1] =3D strtok(0, "."); dq[2] =3D strtok(0, "."); dq[3] =3D strtok(0, =
".");
	snprint(buf, sizeof buf, "%s.%s.%s.%s.in-addr.arpa ptr",
		dq[3], dq[2], dq[1], dq[0]);
	if(write(fd, buf, l) !=3D l)
		return nil;		// close fd & set errstr
	if(read(fd, buf, sizeof buf) < 0)
		return nil;
	s =3D strstr(buf, " ptr ");
	return(strdup(s+5));
}

Well, it=E2=80=99s less pseudocode than a rough draft.  If it passes rog=E2=
=80=99s sanity check I=E2=80=99ll add better error checking and submit it=
 for inclusion somewhere=E2=80=94someone, somewhere, has got to want this=
.

--Joel