Revision 927205da
| b/ncclient/ssh.py | ||
|---|---|---|
| 15 | 15 |
import logging |
| 16 | 16 |
import paramiko |
| 17 | 17 |
|
| 18 |
from os import SEEK_CUR |
|
| 19 |
from cStringIO import StringIO |
|
| 20 |
|
|
| 18 | 21 |
from session import Session, SessionError |
| 19 | 22 |
|
| 20 | 23 |
logger = logging.getLogger('ncclient.ssh')
|
| 21 | 24 |
|
| 25 |
|
|
| 22 | 26 |
class SessionCloseError(SessionError): |
| 23 | 27 |
|
| 24 | 28 |
def __str__(self): |
| ... | ... | |
| 28 | 32 |
SessionError.__init__(self) |
| 29 | 33 |
self._in_buf, self._out_buf = in_buf, out_buf |
| 30 | 34 |
|
| 35 |
|
|
| 31 | 36 |
class SSHSession(Session): |
| 32 | 37 |
|
| 33 | 38 |
BUF_SIZE = 4096 |
| 34 |
MSG_DELIM = ']]>]]>' |
|
| 39 |
MSG_DELIM = ']]>>]]' |
|
| 40 |
|
|
| 35 | 41 |
|
| 36 | 42 |
def __init__(self, load_known_hosts=True, |
| 37 | 43 |
missing_host_key_policy=paramiko.RejectPolicy): |
| 38 | 44 |
Session.__init__(self) |
| 39 |
self._in_buf = '' |
|
| 40 |
self._out_buf = '' |
|
| 41 | 45 |
self._client = paramiko.SSHClient() |
| 42 | 46 |
if load_known_hosts: |
| 43 | 47 |
self._client.load_system_host_keys() |
| 44 | 48 |
self._client.set_missing_host_key_policy(missing_host_key_policy) |
| 49 |
self._in_buf = StringIO() |
|
| 50 |
self._out_buf = StringIO() |
|
| 51 |
self._parsing_state = -1 |
|
| 52 |
self._parsing_pos = 0 |
|
| 53 |
|
|
| 45 | 54 |
|
| 46 | 55 |
def load_host_keys(self, filename): |
| 47 | 56 |
self._client.load_host_keys(filename) |
| 48 | 57 |
|
| 58 |
|
|
| 49 | 59 |
def set_missing_host_key_policy(self, policy): |
| 50 | 60 |
self._client.set_missing_host_key_policy(policy) |
| 51 | 61 |
|
| 62 |
|
|
| 52 | 63 |
# paramiko exceptions ok? |
| 53 | 64 |
# user might be looking for ClientError |
| 54 | 65 |
def connect(self, hostname, port=830, username=None, password=None, |
| ... | ... | |
| 64 | 75 |
self._channel.set_name('netconf')
|
| 65 | 76 |
self._connect() |
| 66 | 77 |
|
| 78 |
|
|
| 67 | 79 |
def run(self): |
| 68 | 80 |
|
| 69 | 81 |
chan = self._channel |
| ... | ... | |
| 71 | 83 |
q = self._q |
| 72 | 84 |
|
| 73 | 85 |
while True: |
| 74 |
|
|
| 75 | 86 |
if chan.closed: |
| 76 | 87 |
break |
| 77 |
|
|
| 78 | 88 |
if chan.recv_ready(): |
| 79 | 89 |
data = chan.recv(SSHSession.BUF_SIZE) |
| 80 | 90 |
if data: |
| 81 |
self._in_buf += data |
|
| 82 |
while True: |
|
| 83 |
before, delim, after = self._in_buf.partition(SSHSession.MSG_DELIM) |
|
| 84 |
if delim: |
|
| 85 |
self.dispatch('reply', before)
|
|
| 86 |
self._in_buf = after |
|
| 87 |
else: |
|
| 88 |
break |
|
| 91 |
self._in_buf.write(data) |
|
| 92 |
self._parse() |
|
| 89 | 93 |
else: |
| 90 | 94 |
break |
| 91 |
|
|
| 92 | 95 |
if chan.send_ready(): |
| 93 | 96 |
if not q.empty(): |
| 94 |
msg = q.get() |
|
| 95 |
self._out_buf += ( msg + SSHSession.MSG_DELIM ) |
|
| 96 |
while self._out_buf: |
|
| 97 |
n = chan.send(self._out_buf) |
|
| 98 |
if n <= 0: |
|
| 99 |
break |
|
| 100 |
self._out_buf = self._out_buf[n:] |
|
| 97 |
self._out_buf.write(q.get() + SSHSession.MSG_DELIM) |
|
| 98 |
self._dump() |
|
| 101 | 99 |
|
| 102 | 100 |
logger.debug('** broke out of main loop **')
|
| 103 | 101 |
self.dispatch('close', SessionCloseError(self._in_buf, self._out_buf))
|
| 104 | 102 |
|
| 103 |
|
|
| 105 | 104 |
def _close(self): |
| 106 | 105 |
self._channel.close() |
| 107 | 106 |
Session._close(self) |
| 108 |
|
|
| 107 |
|
|
| 108 |
def _dump(self): |
|
| 109 |
for line in self._out_buf: |
|
| 110 |
while line: |
|
| 111 |
n = chan.send(line) |
|
| 112 |
if n <= 0: |
|
| 113 |
break |
|
| 114 |
line = self._out_buf[n:] |
|
| 115 |
|
|
| 116 |
def _parse(self): |
|
| 117 |
delim = SSHSession.MSG_DELIM |
|
| 118 |
n = len(delim) - 1 |
|
| 119 |
state = self._parsing_state |
|
| 120 |
buf = self._in_buf |
|
| 121 |
buf.seek(self._parsing_pos) |
|
| 122 |
|
|
| 123 |
while True: |
|
| 124 |
|
|
| 125 |
x = buf.read(1) |
|
| 126 |
if not x: # done reading |
|
| 127 |
break |
|
| 128 |
elif x == delim[state]: |
|
| 129 |
state += 1 |
|
| 130 |
else: |
|
| 131 |
continue |
|
| 132 |
# loop till last delim char expected, break if other char encountered |
|
| 133 |
for i in range(state, n): |
|
| 134 |
x = buf.read(1) |
|
| 135 |
if not x: # done reading |
|
| 136 |
break |
|
| 137 |
if x==delim[i]: # what we expected |
|
| 138 |
state += 1 # expect the next delim char |
|
| 139 |
else: |
|
| 140 |
state = 0 # reset |
|
| 141 |
break |
|
| 142 |
else: # if we didn't break out of above loop, full delim parsed |
|
| 143 |
till = buf.tell() - n |
|
| 144 |
buf.seek(0) |
|
| 145 |
msg = buf.read(till) |
|
| 146 |
self.dispatch('reply', msg)
|
|
| 147 |
buf.seek(n+1, SEEK_CUR) |
|
| 148 |
rest = buf.read() |
|
| 149 |
buf = StringIO() |
|
| 150 |
buf.write(rest) |
|
| 151 |
buf.seek(0) |
|
| 152 |
state = 0 |
|
| 153 |
|
|
| 154 |
self._parsing_state = state |
|
| 155 |
self._in_buf = buf |
|
| 156 |
self._parsing_pos = self._in_buf.tell() |
|
| 109 | 157 |
|
| 110 | 158 |
class MissingHostKeyPolicy(paramiko.MissingHostKeyPolicy): |
| 111 | 159 |
|
Also available in: Unified diff