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#!/bin/bash
prog="netstat"
# Pretty that we're the shell and that this command could not be
# found.
if [ "$FAKE_NETSTAT_NOT_FOUND" = "yes" ] ; then
echo "sh: ${prog}: command not found" >&2
exit 127
fi
usage ()
{
cat >&2 <<EOF
Usage: $prog [ -t | --unix ] [ -n ] [ -a ] [ -l ]
A fake netstat stub that prints items depending on the variables
FAKE_NETSTAT_TCP_ESTABLISHED, FAKE_TCP_LISTEN,
FAKE_NETSTAT_UNIX_LISTEN, depending on command-line options.
Note that -n is ignored.
EOF
exit 1
}
# Defaults.
tcp=false
unix=false
all=false
listen=false
parse_options ()
{
# $POSIXLY_CORRECT means that the command passed to onnode can
# take options and getopt won't reorder things to make them
# options to this script.
_temp=$(POSIXLY_CORRECT=1 getopt -n "$prog" -o "tnalh" -l unix -l help -- "$@")
[ $? != 0 ] && usage
eval set -- "$_temp"
while true ; do
case "$1" in
-n) shift ;;
-a) all=true ; shift ;;
-t) tcp=true ; shift ;;
-l) listen=true ; shift ;;
--unix) unix=true ; shift ;;
--) shift ; break ;;
-h|--help|*) usage ;; # * shouldn't happen, so this is reasonable.
esac
done
[ $# -gt 0 ] && usage
# If neither -t or --unix specified then print all.
$tcp || $unix || { tcp=true ; unix=true ; }
}
parse_options "$@"
if $tcp ; then
if $listen ; then
echo "Active Internet connections (servers only)"
elif $all ; then
echo "Active Internet connections (servers and established)"
else
echo "Active Internet connections (w/o servers)"
fi
echo "Proto Recv-Q Send-Q Local Address Foreign Address State"
tcp_fmt="tcp 0 0 %-23s %-23s %s\n"
for i in $FAKE_NETSTAT_TCP_ESTABLISHED ; do
src="${i%|*}"
dst="${i#*|}"
printf "$tcp_fmt" $src $dst "ESTABLISHED"
done
while read src dst ; do
printf "$tcp_fmt" $src $dst "ESTABLISHED"
done <"$FAKE_NETSTAT_TCP_ESTABLISHED_FILE"
if $all || $listen ; then
for i in $FAKE_TCP_LISTEN ; do
printf "$tcp_fmt" $i "0.0.0.0:*" "LISTEN"
done
fi
fi
if $unix ; then
if $listen ; then
echo "Active UNIX domain sockets (servers only)"
elif $all ; then
echo "Active UNIX domain sockets (servers and established)"
else
echo "Active UNIX domain sockets (w/o servers)"
fi
echo "Proto RefCnt Flags Type State I-Node Path"
unix_fmt="unix 2 [ ACC ] STREAM LISTENING %-8d %s\n"
if $all || $listen ; then
for i in $FAKE_NETSTAT_UNIX_LISTEN ; do
printf "$unix_fmt" 12345 "$i"
done
fi
fi
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