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|
#!/bin/sh
prog="ss"
usage()
{
cat >&2 <<EOF
Usage: $prog { -t|--tcp | -x|--unix } [options] [ FILTER ]
A fake ss 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
}
not_supported()
{
echo "Options not supported in stub: $*" >&2
usage
}
############################################################
#
parse_filter()
{
# Very limited implementation:
# We only expect to find || inside parentheses
# We don't expect to see && - it is implied by juxtaposition
# Operator for port comparison is ignored and assumed to be ==
# Build lists of source ports and source IP addresses where
# each entry is surrounded by '|' characters. These lists can
# be easily "searched" using the POSIX prefix and suffix
# removal operators.
in_parens=false
sports="|"
srcs="|"
while [ -n "$1" ]; do
case "$1" in
\()
in_parens=true
shift
;;
\))
in_parens=false
shift
;;
\|\|)
if ! $in_parens; then
not_supported "|| in parentheses"
fi
shift
;;
sport)
p="${3#:}"
sports="${sports}${p}|"
shift 3
;;
src)
ip="${2#\[}"
ip="${ip%\]}"
srcs="${srcs}${ip}|"
shift 2
;;
*)
usage
;;
esac
done
}
# Check if socket has matches in both ok_ips and ok_ports
filter_socket()
{
ok_ips="$1"
ok_ports="$2"
socket="$3"
ip="${socket%:*}"
port="${socket##*:}"
if [ "$ok_ports" != "|" ] &&
[ "${ok_ports#*|"${port}"|}" = "$ok_ports" ]; then
return 1
fi
if [ "$ok_ips" != "|" ] && [ "${ok_ips#*|"${ip}"|}" = "$ok_ips" ]; then
return 1
fi
return 0
}
ss_tcp_established()
{
if $header; then
echo "Recv-Q Send-Q Local Address:Port Peer Address:Port"
fi
# Yes, lose the quoting so we can do a hacky parsing job
# shellcheck disable=SC2048,SC2086
parse_filter $*
for i in $FAKE_NETSTAT_TCP_ESTABLISHED; do
src="${i%|*}"
dst="${i#*|}"
if filter_socket "$srcs" "$sports" "$src"; then
echo 0 0 "$src" "$dst"
fi
done
if [ -z "$FAKE_NETSTAT_TCP_ESTABLISHED_FILE" ]; then
return
fi
while read -r src dst; do
if filter_socket "$srcs" "$sports" "$src"; then
echo 0 0 "$src" "$dst"
fi
done <"$FAKE_NETSTAT_TCP_ESTABLISHED_FILE"
}
############################################################
unix_listen()
{
if $header; then
cat <<EOF
Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port"
EOF
fi
# Yes, lose the quoting so we can do a hacky parsing job
# shellcheck disable=SC2048,SC2086
parse_filter $*
_n=12345
for _s in $FAKE_NETSTAT_UNIX_LISTEN; do
# ss matches Unix domain sockets as either src or
# sport.
if filter_socket "$srcs" "$sports" "${_s}:" ||
filter_socket "$srcs" "$sports" ":${_s}"; then
printf "u_str LISTEN 0 128 %s %d * 0\n" "$_s" "$_n"
_n=$((_n + 1))
fi
done
}
############################################################
# Defaults.
tcp=false
unix=false
all=false
listen=false
header=true
orig="$*"
while getopts "txnalHh?" opt; do
case "$opt" in
t) tcp=true ;;
x) unix=true ;;
l) listen=true ;;
a) all=true ;;
H) header=false ;;
n) : ;;
\? | h) usage ;;
esac
done
shift $((OPTIND - 1))
$tcp || $unix || not_supported "$*"
if [ -z "$all" ]; then
nosupported "$*"
fi
if $tcp; then
if [ "$1" != "state" ] || [ "$2" != "established" ] || $listen; then
usage
fi
shift 2
# Yes, lose the quoting so we can do a hacky parsing job
# shellcheck disable=SC2048,SC2086
ss_tcp_established $*
exit
fi
if $unix; then
if ! $listen; then
not_supported "$orig"
fi
# Yes, lose the quoting so we can do a hacky parsing job
# shellcheck disable=SC2048,SC2086
unix_listen $*
exit
fi
|
