--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/test_channels.py	Mon Oct 18 14:22:37 2021 +0800
@@ -0,0 +1,134 @@
+from test_dropbear import *
+import signal
+import queue
+import socket
+
+# Tests for various edge cases of SSH channels and connection service
+
+def test_exitcode(request, dropbear):
+	r = dbclient(request, "exit 44")
+	assert r.returncode == 44
+
[email protected](reason="Not yet implemented", strict=True)
+def test_signal(request, dropbear):
+	r = dbclient(request, "kill -FPE $$")
+	assert r.returncode == -signal.SIGFPE
+
[email protected]("size", [0, 1, 2, 100, 5000, 200_000])
+def test_roundtrip(request, dropbear, size):
+	dat = os.urandom(size)
+	r = dbclient(request, "cat", input=dat, capture_output=True)
+	r.check_returncode()
+	assert r.stdout == dat
+
[email protected]("size", [0, 1, 2, 100, 20001, 41234])
+def test_read_pty(request, dropbear, size):
+	# testcase for
+	# https://bugs.openwrt.org/index.php?do=details&task_id=1814
+	# https://github.com/mkj/dropbear/pull/85
+	# From Yousong Zhou
+	# Fixed Oct 2021
+	#
+	#$ ssh -t my.router cat /tmp/bigfile | wc
+	#Connection to my.router closed.
+	#  0       1   14335 <- should be 20001
+
+	# Write the file. No newlines etc which could confuse ptys
+	dat = random_alnum(size)
+	r = dbclient(request, "tmpf=`mktemp`; echo $tmpf; cat > $tmpf", input=dat, capture_output=True, text=True)
+	tmpf = r.stdout.rstrip()
+	r.check_returncode()
+	# Read with a pty, this is what is being tested.
+	# Timing/buffering is subtle, we seem to need to cat a file from disk to hit it.
+	m, s = pty.openpty()
+	r = dbclient(request, "-t", f"cat {tmpf}; rm {tmpf}", stdin=s, capture_output=True)
+	r.check_returncode()
+	assert r.stdout.decode() == dat
+
[email protected]("fd", [1, 2])
+def test_bg_sleep(request, fd, dropbear):
+	# https://lists.ucc.asn.au/pipermail/dropbear/2006q1/000362.html
+	# Rob Landley "Is this a bug?" 24 Mar 2006
+	# dbclient user@system "sleep 10& echo hello"
+	#
+	# It should return right after printing hello, but it doesn't.  It waits until
+	# the child process exits.
+
+	# failure is TimeoutExpired
+	redir = "" if fd == 1 else " >&2 "
+	r = dbclient(request, f"sleep 10& echo hello {redir}",
+		capture_output=True, timeout=2, text=True)
+	r.check_returncode()
+	st = r.stdout if fd == 1 else r.stderr
+
+	if fd == 2 and 'accepted unconditionally' in st:
+		# ignore hostkey warning, a bit of a hack
+		assert st.endswith("\n\nhello\n")
+	else:
+		assert st.rstrip() == "hello"
+
+
+def test_idle(request, dropbear):
+	# Idle test, -I 1 should make it return before the 2 second timeout
+	r = dbclient(request, "-I", "1", "echo zong; sleep 10",
+		capture_output=True, timeout=2, text=True)
+	r.check_returncode()
+	assert r.stdout.rstrip() == "zong"
+
[email protected]("size", [1, 4000, 40000])
+def test_netcat(request, dropbear, size):
+	opt = request.config.option
+	if opt.remote:
+		pytest.xfail("don't know netcat address for remote")
+
+	dat1 = os.urandom(size)
+	dat2 = os.urandom(size)
+	with HandleTcp(3344, 1, dat2) as tcp:
+		r = dbclient(request, "-B", "localhost:3344", input=dat1, capture_output=True)
+		r.check_returncode()
+		assert r.stdout == dat2
+		assert tcp.inbound() == dat1
+
[email protected]("size", [1, 4000, 40000])
[email protected]("fwd_flag", "LR")
+def test_tcpflushout(request, dropbear, size, fwd_flag):
+	""" Tests that an opened TCP connection prevent a SSH session from being closed
+	until that TCP connection has finished transferring
+	"""
+	opt = request.config.option
+	if opt.remote:
+		pytest.xfail("don't know address for remote")
+
+	dat1 = os.urandom(size)
+	dat2 = os.urandom(size)
+	q = queue.Queue()
+	with HandleTcp(3344, timeout=1, response=q) as tcp:
+
+		r = dbclient(request, f"-{fwd_flag}", "7788:localhost:3344", "sleep 0.1; echo -n done",
+			text=True, background=True, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
+		# time to let the listener start
+		time.sleep(0.1)
+		# open a tcp connection
+		c = socket.create_connection(("localhost", 7788))
+
+		# wait for the shell to finish. sleep a bit longer in case it exits.
+		assert r.stdout.read(4) == "done"
+		time.sleep(0.1)
+
+		# now the shell has finished, we can write on the tcp socket
+		c.sendall(dat2)
+		c.shutdown(socket.SHUT_WR)
+		q.put(dat1)
+
+		# return a tcp response
+		q.put(None)
+		# check hasn't exited
+		assert r.poll() == None
+
+		# read the response
+		assert readall_socket(c) == dat1
+		c.close()
+		assert tcp.inbound() == dat2
+		# check has exited, allow time for dbclient to exit
+		time.sleep(0.1)
+		assert r.poll() == 0