From: Michael Olbrich <m.olbrich@pengutronix.de>
To: Roland Hieber <rhi@pengutronix.de>
Cc: distrokit@pengutronix.de
Subject: Re: [DistroKit] [PATCH 5/5] v7a: run: randomise the SSH forwarding port
Date: Mon, 26 Apr 2021 08:33:00 +0200 [thread overview]
Message-ID: <20210426063300.GE27464@pengutronix.de> (raw)
In-Reply-To: <20210426060526.32029-5-rhi@pengutronix.de>
On Mon, Apr 26, 2021 at 08:05:26AM +0200, Roland Hieber wrote:
> When multiple ./configs/platform-v7a/run scripts are run at the same
> time, the first qemu process will open port 4445, and following runs
> will fail. To prevent that, first look at the environment variable
> QEMU_SSH_PORT to determine the port to be used (so that users can set
> this in their shell to keep the port static), or fall back to a random
> port between 1025 and 65025, which should have a good chance of being
> unused. Also print the port forwarding before starting qemu, so we don't
> have to bother with "ps -Af|grep qemu".
>
> Signed-off-by: Roland Hieber <rhi@pengutronix.de>
> ---
> configs/platform-v7a/run | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/configs/platform-v7a/run b/configs/platform-v7a/run
> index d180ccfa890d..cf529e968fb0 100755
> --- a/configs/platform-v7a/run
> +++ b/configs/platform-v7a/run
> @@ -39,7 +39,7 @@ fi
> # the port which an sshd would connect to (in the emulated sysem)
> SSH_INTERNAL_PORT=22
> # the port which QEMU opens at the host side to give access to the ${SSH_INTERNAL_PORT}
> -SSH_EXTERNAL_PORT=4445
> +SSH_EXTERNAL_PORT=${QEMU_SSH_PORT:-${RANDOM%64000+1025}}
This means I have to change the ssh command-line whenever I restart qemu.
Not nice. How about '${PPID%64000+1025}'?
Michael
>
> # check if vde is available for networking
> if [ -z "${VDE_SOCKET}" ]; then
> @@ -59,6 +59,7 @@ fi
> # fall back to user network if necessary
> if [ -z "${QEMU_NET}" ]; then
> QEMU_NET=(-netdev user,id=net1,hostfwd=tcp:127.0.0.1:${SSH_EXTERNAL_PORT}-:${SSH_INTERNAL_PORT} )
> + echo "Forwarding SSH port 127.0.0.1:${SSH_EXTERNAL_PORT} -> qemu:${SSH_INTERNAL_PORT}"
> fi
>
> BASE_CMDLINE="console=ttyAMA0,115200 loglevel=5 systemd.log_level=warning systemd.show_status=auto"
> --
> 2.29.2
>
>
> _______________________________________________
> DistroKit mailing list
> DistroKit@pengutronix.de
>
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next prev parent reply other threads:[~2021-04-26 6:33 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-26 6:05 [DistroKit] [PATCH 1/5] v7a: image-vexpress: convert hex numbers to human-readable sizes Roland Hieber
2021-04-26 6:05 ` [DistroKit] [PATCH 2/5] v7a: images: remove redundant size specifications Roland Hieber
2021-04-26 6:35 ` Robert Schwebel
2021-04-26 6:05 ` [DistroKit] [PATCH 3/5] v7a: barebox: clean up defaultenvs Roland Hieber
2021-04-26 6:36 ` Robert Schwebel
2021-04-26 6:05 ` [DistroKit] [PATCH 4/5] v7a: run: remove telnet port forwarding Roland Hieber
2021-04-26 6:36 ` Robert Schwebel
2021-04-26 6:05 ` [DistroKit] [PATCH 5/5] v7a: run: randomise the SSH forwarding port Roland Hieber
2021-04-26 6:33 ` Michael Olbrich [this message]
2021-04-26 8:30 ` Roland Hieber
2021-04-26 8:35 ` [DistroKit] [PATCH v2] " Roland Hieber
2021-04-26 9:02 ` Robert Schwebel
2021-04-26 9:03 ` Robert Schwebel
2021-04-26 10:07 ` [DistroKit] [PATCH v3] v7a: run: make the SSH forwarding port multiprocess-compatible Roland Hieber
2021-04-26 10:09 ` Robert Schwebel
2021-04-26 6:35 ` [DistroKit] [PATCH 1/5] v7a: image-vexpress: convert hex numbers to human-readable sizes Robert Schwebel
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