mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2024-06-29 22:52:37 +00:00
28141adfdc
Fix the syntax-check failures (which can be seen after python3-flake8-import-order package is installed) with the help of isort[1]: 289/316 libvirt:syntax-check / flake8 FAIL 5.24s exit status 2 [1]: https://pycqa.github.io/isort/ Signed-off-by: Han Han <hhan@redhat.com> Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
353 lines
10 KiB
Python
Executable File
353 lines
10 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
|
|
import argparse
|
|
import array
|
|
import fcntl
|
|
import json
|
|
import os
|
|
import re
|
|
import socket
|
|
import sys
|
|
import traceback
|
|
|
|
import libvirt
|
|
|
|
import libvirt_qemu
|
|
|
|
debug = False
|
|
|
|
|
|
def get_domain(uri, domstr):
|
|
conn = libvirt.open(uri)
|
|
|
|
dom = None
|
|
saveex = None
|
|
|
|
def try_lookup(cb):
|
|
try:
|
|
return cb()
|
|
except libvirt.libvirtError as ex:
|
|
nonlocal saveex
|
|
if saveex is None:
|
|
saveex = ex
|
|
|
|
if re.match(r'^\d+$', domstr):
|
|
dom = try_lookup(lambda: conn.lookupByID(int(domstr)))
|
|
|
|
if dom is None and re.match(r'^[-a-f0-9]{36}|[a-f0-9]{32}$', domstr):
|
|
dom = try_lookup(lambda: conn.lookupByUUIDString(domstr))
|
|
|
|
if dom is None:
|
|
dom = try_lookup(lambda: conn.lookupByName(domstr))
|
|
|
|
if dom is None:
|
|
raise saveex
|
|
|
|
if not dom.isActive():
|
|
raise Exception("Domain must be running to use QMP")
|
|
|
|
return conn, dom
|
|
|
|
|
|
class QMPProxy(object):
|
|
|
|
def __init__(self, conn, dom, serversock, verbose):
|
|
self.conn = conn
|
|
self.dom = dom
|
|
self.verbose = verbose
|
|
|
|
self.serversock = serversock
|
|
self.serverwatch = 0
|
|
|
|
self.clientsock = None
|
|
self.clientwatch = 0
|
|
|
|
self.api2sock = bytes([])
|
|
self.api2sockfds = []
|
|
|
|
self.sock2api = bytes([])
|
|
self.sock2apifds = []
|
|
|
|
self.serverwatch = libvirt.virEventAddHandle(
|
|
self.serversock.fileno(), libvirt.VIR_EVENT_HANDLE_READABLE,
|
|
self.handle_server_io, self)
|
|
|
|
libvirt_qemu.qemuMonitorEventRegister(self.conn, self.dom,
|
|
None,
|
|
self.handle_qmp_event,
|
|
self)
|
|
|
|
@staticmethod
|
|
def handle_qmp_event(conn, dom, event, secs, usecs, details, self):
|
|
evdoc = {
|
|
"event": event,
|
|
"timestamp": {"seconds": secs, "microseconds": usecs}
|
|
}
|
|
if details is not None:
|
|
evdoc["data"] = details
|
|
|
|
ev = json.dumps(evdoc)
|
|
if self.verbose:
|
|
print(ev)
|
|
ev += "\r\n"
|
|
self.api2sock += ev.encode("utf-8")
|
|
self.update_client_events()
|
|
|
|
def recv_with_fds(self):
|
|
# Match VIR_NET_MESSAGE_NUM_FDS_MAX in virnetprotocol.x
|
|
maxfds = 32
|
|
fds = array.array('i')
|
|
cmsgdatalen = socket.CMSG_LEN(maxfds * fds.itemsize)
|
|
|
|
data, cmsgdata, flags, addr = self.clientsock.recvmsg(1024,
|
|
cmsgdatalen)
|
|
for cmsg_level, cmsg_type, cmsg_data in cmsgdata:
|
|
scm_rights = (cmsg_level == socket.SOL_SOCKET and
|
|
cmsg_type == socket.SCM_RIGHTS)
|
|
if scm_rights:
|
|
fds.frombytes(cmsg_data[:len(cmsg_data) -
|
|
(len(cmsg_data) % fds.itemsize)])
|
|
else:
|
|
raise Exception("Unexpected CMSGDATA level %d type %d" % (
|
|
cmsg_level, cmsg_type))
|
|
|
|
return data, [self.make_file(fd) for fd in fds]
|
|
|
|
def send_with_fds(self, data, fds):
|
|
cfds = [fd.fileno() for fd in fds]
|
|
|
|
cmsgdata = [(socket.SOL_SOCKET, socket.SCM_RIGHTS,
|
|
array.array("i", cfds))]
|
|
|
|
return self.clientsock.sendmsg([data], cmsgdata)
|
|
|
|
@staticmethod
|
|
def make_file(fd):
|
|
flags = fcntl.fcntl(fd, fcntl.F_GETFL)
|
|
|
|
mask = os.O_RDONLY | os.O_WRONLY | os.O_RDWR | os.O_APPEND
|
|
flags = flags & mask
|
|
mode = ""
|
|
if flags == os.O_RDONLY:
|
|
mode = "rb"
|
|
elif flags == os.O_WRONLY:
|
|
mode = "wb"
|
|
elif flags == os.O_RDWR:
|
|
mode = "r+b"
|
|
elif flags == (os.O_WRONLY | os.O_APPEND):
|
|
mode = "ab"
|
|
elif flags == (os.O_RDWR | os.O_APPEND):
|
|
mode = "a+b"
|
|
|
|
return os.fdopen(fd, mode)
|
|
|
|
def add_client(self, sock):
|
|
ver = self.conn.getVersion()
|
|
major = int(ver / 1000000) % 1000
|
|
minor = int(ver / 1000) % 1000
|
|
micro = ver % 1000
|
|
|
|
greetingobj = {
|
|
"QMP": {
|
|
"version": {
|
|
"qemu": {
|
|
"major": major,
|
|
"minor": minor,
|
|
"micro": micro,
|
|
},
|
|
"package": f"qemu-{major}.{minor}.{micro}",
|
|
},
|
|
"capabilities": [
|
|
"oob"
|
|
],
|
|
}
|
|
}
|
|
greeting = json.dumps(greetingobj)
|
|
if self.verbose:
|
|
print(greeting)
|
|
greeting += "\r\n"
|
|
|
|
self.clientsock = sock
|
|
self.clientwatch = libvirt.virEventAddHandle(
|
|
self.clientsock.fileno(), libvirt.VIR_EVENT_HANDLE_WRITABLE,
|
|
self.handle_client_io, self)
|
|
self.api2sock += greeting.encode("utf-8")
|
|
self.update_server_events()
|
|
|
|
def remove_client(self):
|
|
libvirt.virEventRemoveHandle(self.clientwatch)
|
|
self.clientsock.close()
|
|
self.clientsock = None
|
|
self.clientwatch = 0
|
|
self.update_server_events()
|
|
|
|
self.api2sock = bytes([])
|
|
self.api2sockfds = []
|
|
|
|
self.sock2api = bytes([])
|
|
self.sock2apifds = []
|
|
|
|
def update_client_events(self):
|
|
# For simplicity of tracking distinct QMP cmds and their passed FDs
|
|
# we don't try to support "pipelining", only a single cmd may be
|
|
# inflight
|
|
if len(self.api2sock) > 0:
|
|
events = libvirt.VIR_EVENT_HANDLE_WRITABLE
|
|
else:
|
|
events = libvirt.VIR_EVENT_HANDLE_READABLE
|
|
|
|
libvirt.virEventUpdateHandle(self.clientwatch, events)
|
|
|
|
def update_server_events(self):
|
|
if self.clientsock is not None:
|
|
libvirt.virEventUpdateHandle(self.serverwatch, 0)
|
|
else:
|
|
libvirt.virEventUpdateHandle(self.serverwatch,
|
|
libvirt.VIR_EVENT_HANDLE_READABLE)
|
|
|
|
def try_command(self):
|
|
try:
|
|
cmdstr = self.sock2api.decode("utf-8")
|
|
cmd = json.loads(cmdstr)
|
|
|
|
if self.verbose:
|
|
cmdstr = cmdstr.strip()
|
|
print(cmdstr)
|
|
except Exception as ex:
|
|
if debug:
|
|
print("Incomplete %s: %s" % (self.sock2api, ex))
|
|
return
|
|
|
|
id = None
|
|
if "id" in cmd:
|
|
id = cmd["id"]
|
|
del cmd["id"]
|
|
|
|
if cmd.get("execute", "") == "qmp_capabilities":
|
|
resobj = {
|
|
"return": {},
|
|
}
|
|
resfds = []
|
|
else:
|
|
if hasattr(libvirt_qemu, "qemuMonitorCommandWithFiles"):
|
|
res, resfds = libvirt_qemu.qemuMonitorCommandWithFiles(
|
|
self.dom, json.dumps(cmd), [f.fileno() for f in self.sock2apifds])
|
|
resobj = json.loads(res)
|
|
else:
|
|
if len(self.sock2apifds) > 0:
|
|
raise Exception("FD passing not supported")
|
|
res = libvirt_qemu.qemuMonitorCommand(
|
|
self.dom, json.dumps(cmd))
|
|
resfds = []
|
|
resobj = json.loads(res)
|
|
|
|
if "id" in resobj:
|
|
del resobj["id"]
|
|
if id is not None:
|
|
resobj["id"] = id
|
|
|
|
res = json.dumps(resobj)
|
|
if self.verbose:
|
|
print(res)
|
|
res += "\r\n"
|
|
|
|
self.sock2api = bytes([])
|
|
self.sock2apifds = []
|
|
self.api2sock += res.encode("utf-8")
|
|
self.api2sockfds = resfds
|
|
|
|
@staticmethod
|
|
def handle_client_io(watch, fd, events, self):
|
|
error = False
|
|
try:
|
|
if events & libvirt.VIR_EVENT_HANDLE_WRITABLE:
|
|
done = self.send_with_fds(self.api2sock, self.api2sockfds)
|
|
if done > 0:
|
|
self.api2sock = self.api2sock[done:]
|
|
self.api2sockfds = []
|
|
elif events & libvirt.VIR_EVENT_HANDLE_READABLE:
|
|
data, fds = self.recv_with_fds()
|
|
if len(data) == 0:
|
|
error = True
|
|
else:
|
|
self.sock2api += data
|
|
if len(fds):
|
|
self.sock2apifds += fds
|
|
|
|
self.try_command()
|
|
else:
|
|
error = True
|
|
except Exception as e:
|
|
global debug
|
|
if debug:
|
|
print("%s: %s" % (sys.argv[0], str(e)))
|
|
print(traceback.format_exc())
|
|
error = True
|
|
|
|
if error:
|
|
self.remove_client()
|
|
else:
|
|
self.update_client_events()
|
|
|
|
@staticmethod
|
|
def handle_server_io(watch, fd, events, self):
|
|
if self.clientsock is None:
|
|
sock, addr = self.serversock.accept()
|
|
self.add_client(sock)
|
|
else:
|
|
self.update_server_events()
|
|
|
|
|
|
def parse_commandline():
|
|
parser = argparse.ArgumentParser(description="Libvirt QMP proxy")
|
|
parser.add_argument("--connect", "-c",
|
|
help="Libvirt QEMU driver connection URI")
|
|
parser.add_argument("--debug", "-d", action='store_true',
|
|
help="Display debugging information")
|
|
parser.add_argument("--verbose", "-v", action='store_true',
|
|
help="Display QMP traffic")
|
|
parser.add_argument("domain", metavar="DOMAIN",
|
|
help="Libvirt guest domain ID/UUID/Name")
|
|
parser.add_argument("sockpath", metavar="QMP-SOCK-PATH",
|
|
help="UNIX socket path for QMP server")
|
|
|
|
return parser.parse_args()
|
|
|
|
|
|
def main():
|
|
args = parse_commandline()
|
|
global debug
|
|
debug = args.debug
|
|
|
|
if not debug:
|
|
libvirt.registerErrorHandler(lambda opaque, error: None, None)
|
|
|
|
libvirt.virEventRegisterDefaultImpl()
|
|
|
|
conn, dom = get_domain(args.connect, args.domain)
|
|
|
|
if conn.getType() != "QEMU":
|
|
raise Exception("QMP proxy requires a QEMU driver connection not %s" %
|
|
conn.getType())
|
|
|
|
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
|
|
if os.path.exists(args.sockpath):
|
|
os.unlink(args.sockpath)
|
|
sock.bind(args.sockpath)
|
|
sock.listen(1)
|
|
|
|
_ = QMPProxy(conn, dom, sock, args.verbose)
|
|
|
|
while True:
|
|
libvirt.virEventRunDefaultImpl()
|
|
|
|
|
|
try:
|
|
main()
|
|
sys.exit(0)
|
|
except Exception as e:
|
|
print("%s: %s" % (sys.argv[0], str(e)))
|
|
if debug:
|
|
print(traceback.format_exc())
|
|
sys.exit(1)
|