Re: tech proposal to make manoj somewhat happy.

[Raul Miller <rdm@test.legislate.com>]

Jason Gunthorpe <jgg@gpu.srv.ualberta.ca> wrote:
> The APT http (and ftp) clients are probably ideally suited to this. They
> are about 30-40k each.

For what it's worth, nc is about 16k, and that little script I included a
few messages back was less than 512 bytes.  It needs something to parse
the ip address and port, but the parsing could be handled by /bin/sh
and sed -- all that's really needed is some way of multiplying by 256
and adding.

And, nc could be trimmed down a fair bit, I think.

Hmm... [read, read, read, test, test]. Turns out that /bin/sh on the
rescue disk knows how to do math.  Here's a variation on that ftp script
which should work on the rescue disk (or would if something like nc
is available).  Since all it needs to do is retrieve a single file,
perhaps from a dedicated server, probably even this much complexity
isn't needed:

#!/bin/sh
# trivial ftp client -- requested file appears on stdout

if [ $# != 3 ]; then
	>&2 echo "Usage: $0 host dir file"
	exit 1
fi

retrieve() {
	while read line; do
		>&2 echo "$line";
		case "$line" in [1-5][0-9][0-9]\ *) echo "$line";; esac
	done | (
		read connect
		read user
		read pass
		read cwd
		read pasv
		echo $pasv | sed 's/.*[^0-9]\([0-9]*,[0-9]*,[0-9]*,[0-9]*,[0-9]*,[0-9]*\).*/\1/' | (
			IFS=,
			read a b c d e f
			eval nc $a.$b.$c.$d $(($e * 256 + $f)) </dev/null
		)
	)
}

nc $1 21 <<END | retrieve
USER ftp
PASS `whoami`@
CWD $2
PASV
RETR $3
QUIT
END

-- 
Raul


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