Re: bash sockets: printf \x0a does TCP fragmentation

From	dirk+bash@testssl.sh
Newsgroups	gnu.bash.bug
Subject	Re: bash sockets: printf \x0a does TCP fragmentation
Date	2018-09-22 12:57 +0200
Message-ID	<mailman.1136.1537613852.1284.bug-bash@gnu.org> (permalink)
References	<c6de6616-dda0-570d-de56-419e7676be8a@cbii-hh.de> <20180921231101307758654@bob.proulx.com> <714e1ba0-0052-2f2b-676d-778f2b7129c1@testssl.sh> <214257ac-8b64-a3ea-2834-acd18533f08c@iki.fi>

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On 9/22/18 12:30 PM, Ilkka Virta wrote:

> The coreutils printf seems to output 'foo\nbar\n' as a single write, though (unless
> it goes to the terminal, so the usual stdio buffering), so you might be able to use
> that.

thx. Might be not that portable but we'll see.

> In any case, if a TCP endpoint cares about getting full data packets within a single
> segment, I'd say it's broken.

fully agree. But unfortunately it just comforts us :-)

Keep in mind that the purpose of the tool is testing and if due to a bug it can't do
that, were the ones being blamed or we need to do really strange workarounds to avoid
'\x0a' in the first 8 bytes.

Dirk

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Re: bash sockets: printf \x0a does TCP fragmentation dirk+bash@testssl.sh - 2018-09-22 12:57 +0200

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