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flatcar-update: Replace ncat with socat #124

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merged 1 commit into from
Aug 9, 2024
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flatcar-update: Replace ncat with socat #124

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28 changes: 26 additions & 2 deletions bin/flatcar-update
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Original file line number Diff line number Diff line change
Expand Up @@ -267,12 +267,36 @@ tee -a /tmp/response > /dev/null <<-EOF
</updatecheck><event status="ok"></event></app></response>
EOF

# Cleanups for local socat servers below

true > /tmp/payload-server-pids
trap "umount /usr/share/update_engine/update-payload-key.pub.pem 2> /dev/null || true; rm -f /tmp/response /tmp/payload-server ; cat /tmp/payload-server-pids | xargs -r kill ; rm -f /tmp/payload-server-pids" EXIT INT
ncat --keep-open -c "echo -en 'HTTP/1.1 200 OK\ncontent-type: text/xml\ncontent-length: $(stat --printf='%s\n' /tmp/response)\n\n'; cat /tmp/response" -l "$LISTEN_PORT_1" &
trap "umount /usr/share/update_engine/update-payload-key.pub.pem 2> /dev/null || true ; cat /tmp/payload-server-pids | xargs -r kill ; rm -f /tmp/response /tmp/payload-server /tmp/response-server /tmp/payload-server-pids" EXIT INT


# Setup for XML response server

# Helper script because inline quoting is insane
tee /tmp/response-server > /dev/null <<'EOF'
#!/bin/bash
set -euo pipefail
read -a WORDS
if [[ ${#WORDS[@]} -ne 3 ]] || [[ ${WORDS[0]} != POST ]] || [[ ${WORDS[1]} != /update ]] ; then
echo -ne "HTTP/1.1 400 Bad request\r\n\r\n"; exit 0
fi
echo -ne "HTTP/1.1 200 OK\r\n"
echo -ne "Content-Type: text/xml\r\n"
LEN=$(stat --printf='%s\n' /tmp/response)
echo -ne "Content-Length: ${LEN}\r\n"
echo -ne "\r\n"
cat /tmp/response
EOF

chmod +x /tmp/response-server
socat TCP-LISTEN:"${LISTEN_PORT_1}",reuseaddr,fork SYSTEM:'/tmp/response-server' &
CHILDPID="$!"
echo "${CHILDPID}" >> /tmp/payload-server-pids

# Setup for payload server

# Helper script because inline quoting is insane
tee /tmp/payload-server > /dev/null <<'EOF'
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