260 lines
8.5 KiB
Python
260 lines
8.5 KiB
Python
#!/usr/bin/env python
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import os,time,base64,json,socket,select,errno,sys
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# FIXME: this script is adapted from
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# https://wiki.mikrotik.com/wiki/Manual:CHR#Provisioning
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# I don't know if it is freely usable/redistributable
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class GuestAgent(object):
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'''
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Qemu guest agent interface
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runScript and runFile commands are tailored for ROS agent implementation
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Transport provided by derived classes (transact method)
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'''
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def __init__(self,**kwargs):
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# Due to file contents being passed as base64 inside json:
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# - large chunk sizes may slow down guest-side parsing.
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# - small chunk sizes result in additional message fragmentation overhead.
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# Default value is a guestimate.
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self.__chunkSize = kwargs.get('chunkSize', 4096)
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def _qmpError(self,cls,msg):
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''' Generic callback to log qmp errors before (optionally) raising an exception '''
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print(cls)
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for line in msg.split('\n'):
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print(line)
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# raise RuntimeError()
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def _error(self,msg,*a):
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''' Generic callback to misc errors before (optionally) raising an exception '''
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print(msg.format(*a))
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# raise RuntimeError()
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def _info(self,msg,*a):
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''' Generic callback to log info '''
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print(msg.format(*a))
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def _monitorJob(self,pid):
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''' Block untill script job completes, echo output. Returns None on failure '''
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ret = self.transact('guest-exec-status',{'pid':pid})
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if ret is None:
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return None
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while not bool(ret['exited']):
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time.sleep(1)
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ret = self.transact('guest-exec-status',{'pid':pid})
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if ret is None:
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return None
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# err-data is never sent
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out = []
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if 'out-data' in ret.keys():
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out = base64.b64decode(ret['out-data']).decode('utf-8').split('\n')
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if not out[-1]:
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out = out[:-1]
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exitcode = int(ret['exitcode'])
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return exitcode, out
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def putFile(self,src,dst):
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''' Upload file '''
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src = os.path.expanduser(src)
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if not os.path.exists(src) or not os.path.isfile(src):
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self._error('File does not exist: \'{}\'', src)
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return None
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ret = self.transact('guest-file-open', {'path':dst,'mode':'w'})
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if ret is None:
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return None
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handle = int(ret)
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file = open(src, 'rb')
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for chunk in iter(lambda: file.read(self.__chunkSize), b''):
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count = len(chunk)
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chunk = base64.b64encode(chunk).decode('ascii')
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ret = self.transact('guest-file-write',{'handle':handle,'buf-b64':chunk,'count':count})
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if ret is None:
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return None
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self.transact('guest-file-flush',{'handle':handle})
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ret = self.transact('guest-file-close',{'handle':handle})
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return True
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def getFile(self,src,dst):
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''' Download file '''
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dst = os.path.expanduser(dst)
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ret = self.transact('guest-file-open',{'path':src,'mode':'rb'})
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if ret is None:
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return None
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handle = int(ret)
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data = ''
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size = 0
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while True:
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ret = self.transact('guest-file-read',{'handle':handle,'count':self.__chunkSize})
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if ret is None:
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return None
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data += ret['buf-b64']
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size += int(ret['count'])
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if bool(ret['eof']):
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break
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ret = self.transact('guest-file-close',{'handle':handle})
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data = base64.b64decode(data.encode('ascii'))
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with open(dst,'wb') as f:
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f.write(data)
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return True
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def ping(self):
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ret = self.transact('guest-ping',{})
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if ret is None:
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return None
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return ret
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def runFile(self,fileName):
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''' Execute file (on guest) as script '''
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ret = self.transact('guest-exec',{'path':fileName, 'capture-output':True})
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if ret is None:
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return None
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pid = ret['pid']
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return self._monitorJob(pid)
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def runSource(self,cmd):
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''' Execute script '''
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if isinstance(cmd,list):
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cmd = '\n'.join(cmd)
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cmd += '\n'
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cmd = base64.b64encode(cmd.encode('utf-8')).decode('ascii')
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ret = self.transact('guest-exec',{'input-data':cmd, 'capture-output':True})
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if ret is None:
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return None
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pid = ret['pid']
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return self._monitorJob(pid)
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def shutdown(self,mode='powerdown'):
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'''
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Execut shutdown command
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mode == 'reboot' - reboot guest
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mode == 'shutdown' or mode == 'halt' - shutdown guest
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'''
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ret = self.transact('guest-shutdown',{'mode':mode})
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return ret
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class SocketAgent(GuestAgent):
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'''
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GuestAgent using unix/tcp sockets for communication.
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'''
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def __init__(self):
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GuestAgent.__init__(self,chunkSize= 32 * 65536)
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@staticmethod
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def unix(dev):
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''' Connect using unix socket '''
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self = SocketAgent()
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self.__af = socket.AF_UNIX
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self.__args = dev
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self.__wait = True
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return self
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@staticmethod
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def tcp(ip,port,wait = True):
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''' Connect using tcp socket '''
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self = SocketAgent()
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self.__af = socket.AF_INET
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self.__args = (ip,port)
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self.__wait = wait
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return self
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def __enter__(self):
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self._sock = socket.socket(self.__af, socket.SOCK_STREAM)
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if self.__wait:
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self._info('Waiting for guest ...')
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# Wait for hyper to create channel
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while True:
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try:
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self._sock.connect(self.__args)
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break
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except socket.error as e:
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print("error connecting", e)
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if e.errno == errno.EHOSTUNREACH or e.errno == errno.ECONNREFUSED:
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time.sleep(1)
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else:
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self._sock.close()
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raise
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#Wait for guest agent to initialize and sync
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while True:
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import random
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key = random.randint(0, 0xffffffff)
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msg = json.dumps({'execute':'guest-sync-delimited','arguments':{'id':key}},separators=(',',':'),sort_keys=True)
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self._sock.send(msg.encode('ascii'))
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self._sock.setblocking(0)
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response = b''
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if (select.select([self._sock],[],[])[0]):
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response += self._sock.recv(65536)
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else:
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raise RuntimeError()
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self._sock.setblocking(1)
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sentinel = b'\xff'
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response = response.split(sentinel)[-1]
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if not response:
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time.sleep(3)
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continue
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response = json.loads(response.decode('utf-8').strip())
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if 'return' in response.keys():
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if int(response['return']) == key:
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break
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time.sleep(3)
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else:
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self._sock.connect(self.__args)
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return self
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def __exit__(self,*a):
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self._sock.close()
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def transact(self,cmd,args={}):
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''' Exchange a single command with guest agent '''
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timeout = 2
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msg = json.dumps({'execute':cmd,'arguments':args},separators=(',',':'),sort_keys=True)
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self._sock.send(msg.encode('ascii'))
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self._sock.setblocking(0)
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response = b''
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if (select.select([self._sock],[],[],timeout)[0]):
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response += self._sock.recv(65536)
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self._sock.setblocking(1)
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if not response:
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response = None
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else:
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if response[0] == 255: # sync
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response = response[1:]
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print(response.decode('utf-8').strip())
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response = json.loads(response.decode('utf-8').strip())
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if 'error' in response.keys():
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self._qmpError(response['error']['class'],response['error']['desc'])
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response = None
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elif 'return' in response:
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response = response['return']
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return response
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#-------------------------------------------------------------------------------
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if __name__ == '__main__':
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socketpath,filename=sys.argv[1:]
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script = open(filename,"r").readlines()
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with SocketAgent.unix(socketpath) as agent:
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ret,out = agent.runSource(script)
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print('ret = {}'.format(ret))
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for line in out:
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print(line)
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