Mercurial > dropbear

annotate test/test_channels.py @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +0800
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1 from test_dropbear import *
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2 import signal
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3 import queue
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4 import socket
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5
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6 # Tests for various edge cases of SSH channels and connection service
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7
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8 def test_exitcode(request, dropbear):
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9 r = dbclient(request, "exit 44")
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10 assert r.returncode == 44
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11
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12 @pytest.mark.xfail(reason="Not yet implemented", strict=True)
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13 def test_signal(request, dropbear):
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14 r = dbclient(request, "kill -FPE $$")
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15 assert r.returncode == -signal.SIGFPE
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16
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17 @pytest.mark.parametrize("size", [0, 1, 2, 100, 5000, 200_000])
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18 def test_roundtrip(request, dropbear, size):
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19 dat = os.urandom(size)
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20 r = dbclient(request, "cat", input=dat, capture_output=True)
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21 r.check_returncode()
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22 assert r.stdout == dat
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23
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24 @pytest.mark.parametrize("size", [0, 1, 2, 100, 20001, 41234])
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25 def test_read_pty(request, dropbear, size):
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26 # testcase for
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27 # https://bugs.openwrt.org/index.php?do=details&task_id=1814
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28 # https://github.com/mkj/dropbear/pull/85
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29 # From Yousong Zhou
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30 # Fixed Oct 2021
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31 #
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32 #$ ssh -t my.router cat /tmp/bigfile | wc
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33 #Connection to my.router closed.
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34 # 0 1 14335 <- should be 20001
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35
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36 # Write the file. No newlines etc which could confuse ptys
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37 dat = random_alnum(size)
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38 r = dbclient(request, "tmpf=`mktemp`; echo $tmpf; cat > $tmpf", input=dat, capture_output=True, text=True)
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39 tmpf = r.stdout.rstrip()
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40 r.check_returncode()
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41 # Read with a pty, this is what is being tested.
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42 # Timing/buffering is subtle, we seem to need to cat a file from disk to hit it.
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43 m, s = pty.openpty()
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44 r = dbclient(request, "-t", f"cat {tmpf}; rm {tmpf}", stdin=s, capture_output=True)
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45 r.check_returncode()
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46 assert r.stdout.decode() == dat
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47
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48 @pytest.mark.parametrize("fd", [1, 2])
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49 def test_bg_sleep(request, fd, dropbear):
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50 # https://lists.ucc.asn.au/pipermail/dropbear/2006q1/000362.html
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51 # Rob Landley "Is this a bug?" 24 Mar 2006
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52 # dbclient user@system "sleep 10& echo hello"
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53 #
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54 # It should return right after printing hello, but it doesn't. It waits until
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55 # the child process exits.
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56
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57 # failure is TimeoutExpired
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58 redir = "" if fd == 1 else " >&2 "
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59 r = dbclient(request, f"sleep 10& echo hello {redir}",
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60 capture_output=True, timeout=2, text=True)
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61 r.check_returncode()
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62 st = r.stdout if fd == 1 else r.stderr
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63
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64 if fd == 2 and 'accepted unconditionally' in st:
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65 # ignore hostkey warning, a bit of a hack
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66 assert st.endswith("\n\nhello\n")
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67 else:
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68 assert st.rstrip() == "hello"
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69
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70
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71 def test_idle(request, dropbear):
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72 # Idle test, -I 1 should make it return before the 2 second timeout
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73 r = dbclient(request, "-I", "1", "echo zong; sleep 10",
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74 capture_output=True, timeout=2, text=True)
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75 r.check_returncode()
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76 assert r.stdout.rstrip() == "zong"
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77
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78 @pytest.mark.parametrize("size", [1, 4000, 40000])
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79 def test_netcat(request, dropbear, size):
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80 opt = request.config.option
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81 if opt.remote:
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82 pytest.xfail("don't know netcat address for remote")
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83
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84 dat1 = os.urandom(size)
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85 dat2 = os.urandom(size)
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86 with HandleTcp(3344, 1, dat2) as tcp:
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87 r = dbclient(request, "-B", "localhost:3344", input=dat1, capture_output=True)
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88 r.check_returncode()
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89 assert r.stdout == dat2
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90 assert tcp.inbound() == dat1
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91
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92 @pytest.mark.parametrize("size", [1, 4000, 40000])
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93 @pytest.mark.parametrize("fwd_flag", "LR")
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94 def test_tcpflushout(request, dropbear, size, fwd_flag):
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95 """ Tests that an opened TCP connection prevent a SSH session from being closed
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96 until that TCP connection has finished transferring
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97 """
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98 opt = request.config.option
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99 if opt.remote:
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100 pytest.xfail("don't know address for remote")
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101
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102 dat1 = os.urandom(size)
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103 dat2 = os.urandom(size)
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104 q = queue.Queue()
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105 with HandleTcp(3344, timeout=1, response=q) as tcp:
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106
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107 r = dbclient(request, f"-{fwd_flag}", "7788:localhost:3344", "sleep 0.1; echo -n done",
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108 text=True, background=True, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
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109 # time to let the listener start
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110 time.sleep(0.1)
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111 # open a tcp connection
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112 c = socket.create_connection(("localhost", 7788))
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113
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114 # wait for the shell to finish. sleep a bit longer in case it exits.
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115 assert r.stdout.read(4) == "done"
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116 time.sleep(0.1)
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117
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118 # now the shell has finished, we can write on the tcp socket
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119 c.sendall(dat2)
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120 c.shutdown(socket.SHUT_WR)
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121 q.put(dat1)
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122
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123 # return a tcp response
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124 q.put(None)
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125 # check hasn't exited
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126 assert r.poll() == None
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127
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128 # read the response
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129 assert readall_socket(c) == dat1
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130 c.close()
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131 assert tcp.inbound() == dat2
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132 # check has exited, allow time for dbclient to exit
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133 time.sleep(0.1)
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134 assert r.poll() == 0