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Support Fedora, fix netcat selection via NC environment variable #5

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Support Fedora, fix netcat selection via NC environment variable #5

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d3e2210
Actually use netcat provided by NC env var
Reisse Apr 8, 2021
6ce84ea
Improve netcat detection (support Fedora-flavor of OpenBSD netcat)
Reisse Apr 8, 2021
3ad923f
Fix port selection syntax
Reisse Apr 8, 2021
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6 changes: 3 additions & 3 deletions dhcp.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -61,7 +61,7 @@ while getopts "s:m:i:g:l:p:hd" opt; do
esac
done

if [[ $($NC -h 2>&1 | head -1 | grep -q OpenBSD; echo $?) == "1" ]]; then
if [[ $("$NC" -w 0 2>&1 | head -1 | grep -q "nvalid.*time"; echo $?) == "0" ]]; then
echo "Not supported nc."
echo "This solution works only with OpenBSD netcat."
echo "Your netcat: $NC"
Expand Down Expand Up @@ -93,7 +93,7 @@ fi
# Handle requests while server is running
while [[ "$RUNNING" == "1" ]]; do
# One netcat handles only one broadcast packet
nc -lup 67 -w0 | stdbuf -o0 od -v -w1 -t x1 -An | {
"$NC" -ul 67 -w0 | stdbuf -o0 od -v -w1 -t x1 -An | {

function read_dhcp() {
# Read beginning with constant size
Expand Down Expand Up @@ -232,7 +232,7 @@ while [[ "$RUNNING" == "1" ]]; do
for i in ${raw_opt[*]}; do
printf "\x$i" >> /tmp/dhcp.payload
done
cat /tmp/dhcp.payload | nc -ub 255.255.255.255 68 -s $SERVER -p 67 -w0
cat /tmp/dhcp.payload | "$NC" -ub 255.255.255.255 68 -s $SERVER -p 67 -w0
[[ "$DEBUG" != "1" ]] && rm /tmp/dhcp.payload
}

Expand Down