1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
#######################################################################
# bidirectional communication
PORT=$(random_port)
declare -a ARGS
if [ "$NETCAT_UNIX" = "y" ]; then
FAM="AF_UNIX"
ARGS=( -${NETCAT_DGRAM:+u}U "$TEMPDIR/$PORT.sock" )
else
FAM="AF_INET"
ARGS=( ${NETCAT_DGRAM:+-u} "127.0.0.1" "$PORT" )
fi
start_server() {
#echo nc "${ARGS[@]}"
PIPES="y" netcat_listen "${ARGS[@]}"
cat <&$LISTEN_OUT >"$TEMPDIR/server.out" &
if [ "${BIND_ADDRESS#"{sa_family=$FAM"[,\}]}" = "$BIND_ADDRESS" ]; then # sanity check
printf "ERROR at line %d: address \"%s\" isn't %s\\n" ${BASH_LINENO[0]} "$BIND_ADDRESS" "$FAM" >&2
exit 1
fi
}
start_client() {
local in="$TEMPDIR/client.in" out="$TEMPDIR/client.out"
mkfifo -- "$in"
$NC "${ARGS[@]}" <"$in" >"$out" {LISTEN_IN}>&- {LISTEN_OUT}<&- & CLIENT_PID=$!
exec {CONNECT_IN}>"$in"
rm -f -- "$in"
}
sendto() {
local to="$1" from fd
if [ "$to" = "client" ]; then
from="server"
fd=$LISTEN_IN
elif [ "$to" = "server" ]; then
from="client"
fd=$CONNECT_IN
fi
tee -a -- "$TEMPDIR/$from.in" >&$fd
}
start_server
start_client
head -c1024 /dev/urandom | sendto client
head -c1024 /dev/urandom | sendto server
for i in $(seq 1 128); do
l=$(shuf -n1 -i1-128)
t="$(shuf -n1 -e "client" "server")" # choose target at random
head -c$l /dev/urandom | sendto "$t"
done
exec {CONNECT_IN}>&- {LISTEN_IN}>&- # close inputs
sleep 0.25 # give netcat a chance to finish its work
kill_and_wait $CLIENT_PID
diff --color=auto -u --label="a/client" --label="b/client" -- "$TEMPDIR/server.in" "$TEMPDIR/client.out"
${NETCAT_DGRAM:+kill_and_}wait $PID
diff --color=auto -u --label="a/server" --label="b/server" -- "$TEMPDIR/client.in" "$TEMPDIR/server.out"
# vim: set filetype=bash :
|
