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Make port scans non-blocking

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Martin Wimpress 2021-12-03 11:33:41 +00:00
parent 4f0bbfc667
commit e6823edde7
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1 changed files with 3 additions and 2 deletions
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@ -136,8 +136,9 @@ function get_port() {
local PORT_RANGE=$((PORT_START+$2))
local PORT
for ((PORT = PORT_START; PORT <= PORT_RANGE; PORT++)); do
(echo -n "" >/dev/tcp/127.0.0.1/"${PORT}") >/dev/null 2>&1
if [ ${?} -ne 0 ]; then
# Make sure port scans do not block too long.
timeout 0.1s bash -c "echo >/dev/tcp/127.0.0.1/${PORT}" >/dev/null 2>&1
if [ ${?} -eq 1 ]; then
echo "${PORT}"
break
fi