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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
@pytest.mark.xfail(reason="Not yet implemented", strict=True)
def test_signal(request, dropbear):
r = dbclient(request, "kill -FPE $$")
assert r.returncode == -signal.SIGFPE
@pytest.mark.parametrize("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
@pytest.mark.parametrize("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
@pytest.mark.parametrize("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"
@pytest.mark.parametrize("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
@pytest.mark.parametrize("size", [1, 4000, 40000])
@pytest.mark.parametrize("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
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