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import time
import pexpect
from pexpect import pxssh
from debugger import ignore_keyintr, aware_keyintr
from exception import TimeoutException, SSHConnectionException, SSHSessionDeadException
from utils import RED, GREEN
"""
Module handle ssh sessions between tester and DUT.
Implement send_expect function to send command and get output data.
Aslo support transfer files to tester or DUT.
"""
class SSHPexpect(object):
def __init__(self, host, username, password):
self.magic_prompt = "MAGIC PROMPT"
try:
self.session = pxssh.pxssh()
self.host = host
self.username = username
self.password = password
if ':' in host:
self.ip = host.split(':')[0]
self.port = int(host.split(':')[1])
self.session.login(self.ip, self.username,
self.password, original_prompt='[$#>]',
port=self.port, login_timeout=20)
else:
self.session.login(self.host, self.username,
self.password, original_prompt='[$#>]')
self.send_expect('stty -echo', '# ', timeout=2)
except Exception, e:
print RED(e)
if getattr(self, 'port', None):
suggestion = "\nSuggession: Check if the fireware on [ %s ] " % \
self.ip + "is stoped\n"
print GREEN(suggestion)
raise SSHConnectionException(host)
def init_log(self, logger, name):
self.logger = logger
self.logger.info("ssh %s@%s" % (self.username, self.host))
def send_expect_base(self, command, expected, timeout):
ignore_keyintr()
self.clean_session()
self.session.PROMPT = expected
self.__sendline(command)
self.__prompt(command, timeout)
aware_keyintr()
before = self.get_output_before()
return before
def send_expect(self, command, expected, timeout=15, verify=False):
ret = self.send_expect_base(command, expected, timeout)
if verify:
ret_status = self.send_expect_base("echo $?", expected, timeout)
if not int(ret_status):
return ret
else:
self.logger.error("Command: %s failure!" % command)
self.logger.error(ret)
return int(ret_status)
else:
return ret
def send_command(self, command, timeout=1):
ignore_keyintr()
self.clean_session()
self.__sendline(command)
aware_keyintr()
return self.get_session_before(timeout)
def clean_session(self):
self.get_session_before(timeout=0.01)
def get_session_before(self, timeout=15):
"""
Get all output before timeout
"""
ignore_keyintr()
self.session.PROMPT = self.magic_prompt
try:
self.session.prompt(timeout)
except Exception as e:
pass
aware_keyintr()
before = self.get_output_before()
self.__flush()
return before
def __flush(self):
"""
Clear all session buffer
"""
self.session.buffer = ""
self.session.before = ""
def __prompt(self, command, timeout):
if not self.session.prompt(timeout):
raise TimeoutException(command, self.get_output_all())
def __sendline(self, command):
if not self.isalive():
raise SSHSessionDeadException(self.host)
if len(command) == 2 and command.startswith('^'):
self.session.sendcontrol(command[1])
else:
self.session.sendline(command)
def get_output_before(self):
if not self.isalive():
raise SSHSessionDeadException(self.host)
self.session.flush()
before = self.session.before.rsplit('\r\n', 1)
if before[0] == "[PEXPECT]":
before[0] = ""
return before[0]
def get_output_all(self):
self.session.flush()
output = self.session.before
output.replace("[PEXPECT]", "")
return output
def close(self, force=False):
if force is True:
self.session.close()
else:
if self.isalive():
self.session.logout()
def isalive(self):
return self.session.isalive()
def copy_file_from(self, src, dst=".", password=''):
"""
Copies a file from a remote place into local.
"""
command = 'scp -v {0}@{1}:{2} {3}'.format(self.username, self.host, src, dst)
if ':' in self.host:
command = 'scp -v -P {0} -o NoHostAuthenticationForLocalhost=yes {1}@{2}:{3} {4}'.format(
str(self.port), self.username, self.ip, src, dst)
if password == '':
self._spawn_scp(command, self.password)
else:
self._spawn_scp(command, password)
def copy_file_to(self, src, dst="~/", password=''):
"""
Sends a local file to a remote place.
"""
command = 'scp {0} {1}@{2}:{3}'.format(src, self.username, self.host, dst)
if ':' in self.host:
command = 'scp -v -P {0} -o NoHostAuthenticationForLocalhost=yes {1} {2}@{3}:{4}'.format(
str(self.port), src, self.username, self.ip, dst)
else:
command = 'scp -v {0} {1}@{2}:{3}'.format(
src, self.username, self.host, dst)
if password == '':
self._spawn_scp(command, self.password)
else:
self._spawn_scp(command, password)
def _spawn_scp(self, scp_cmd, password):
"""
Transfer a file with SCP
"""
self.logger.info(scp_cmd)
p = pexpect.spawn(scp_cmd)
time.sleep(0.5)
ssh_newkey = 'Are you sure you want to continue connecting'
i = p.expect([ssh_newkey, '[pP]assword', "# ", pexpect.EOF,
pexpect.TIMEOUT], 120)
if i == 0: # add once in trust list
p.sendline('yes')
i = p.expect([ssh_newkey, '[pP]assword', pexpect.EOF], 2)
if i == 1:
time.sleep(0.5)
p.sendline(password)
p.expect("Exit status 0", 60)
if i == 4:
self.logger.error("SCP TIMEOUT error %d" % i)
p.close()
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