313 lines
9.4 KiB
Python
313 lines
9.4 KiB
Python
#!/usr/bin/python
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# Copyright (c) 2016 IBM Corp.
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#
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# This module is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This software is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this software. If not, see <http://www.gnu.org/licenses/>.
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import glob
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import os
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import sys
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import select
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import socket
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import subprocess
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import threading
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import time
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LOG_STREAM_FILE = '/tmp/console-{log_uuid}.log'
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LOG_STREAM_PORT = 19885
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def daemonize():
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# A really basic daemonize method that should work well enough for
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# now in this circumstance. Based on the public domain code at:
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# http://web.archive.org/web/20131017130434/http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/
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pid = os.fork()
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if pid > 0:
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return True
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os.chdir('/')
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os.setsid()
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os.umask(0)
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pid = os.fork()
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if pid > 0:
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sys.exit(0)
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sys.stdout.flush()
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sys.stderr.flush()
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i = open('/dev/null', 'r')
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o = open('/dev/null', 'a+')
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e = open('/dev/null', 'ab+', 0)
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os.dup2(i.fileno(), sys.stdin.fileno())
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os.dup2(o.fileno(), sys.stdout.fileno())
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os.dup2(e.fileno(), sys.stderr.fileno())
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return False
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class Console(object):
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def __init__(self, path):
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self.path = path
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self.file = open(path, 'rb')
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self.stat = os.stat(path)
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self.size = self.stat.st_size
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class Server(object):
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MAX_REQUEST_LEN = 1024
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REQUEST_TIMEOUT = 10
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def __init__(self, path, port):
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self.path = path
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s = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
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s.setsockopt(socket.SOL_SOCKET,
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socket.SO_REUSEADDR, 1)
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s.bind(('::', port))
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s.listen(1)
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self.socket = s
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def accept(self):
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conn, addr = self.socket.accept()
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return conn
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def run(self):
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while True:
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conn = self.accept()
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t = threading.Thread(target=self.handleOneConnection, args=(conn,))
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t.daemon = True
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t.start()
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def chunkConsole(self, conn, log_uuid):
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try:
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console = Console(self.path.format(log_uuid=log_uuid))
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except Exception:
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return
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while True:
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chunk = console.file.read(4096)
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if not chunk:
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break
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conn.send(chunk)
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return console
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def followConsole(self, console, conn):
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while True:
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# As long as we have unread data, keep reading/sending
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while True:
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chunk = console.file.read(4096)
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if chunk:
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conn.send(chunk)
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else:
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break
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# At this point, we are waiting for more data to be written
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time.sleep(0.5)
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# Check to see if the remote end has sent any data, if so,
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# discard
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r, w, e = select.select([conn], [], [conn], 0)
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if conn in e:
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return False
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if conn in r:
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ret = conn.recv(1024)
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# Discard anything read, if input is eof, it has
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# disconnected.
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if not ret:
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return False
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# See if the file has been truncated
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try:
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st = os.stat(console.path)
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if (st.st_ino != console.stat.st_ino or
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st.st_size < console.size):
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return True
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except Exception:
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return True
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console.size = st.st_size
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def get_command(self, conn):
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poll = select.poll()
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bitmask = (select.POLLIN | select.POLLERR |
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select.POLLHUP | select.POLLNVAL)
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poll.register(conn, bitmask)
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buffer = b''
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ret = None
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start = time.time()
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while True:
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elapsed = time.time() - start
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timeout = max(self.REQUEST_TIMEOUT - elapsed, 0)
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if not timeout:
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raise Exception("Timeout while waiting for input")
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for fd, event in poll.poll(timeout):
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if event & select.POLLIN:
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buffer += conn.recv(self.MAX_REQUEST_LEN)
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else:
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raise Exception("Received error event")
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if len(buffer) >= self.MAX_REQUEST_LEN:
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raise Exception("Request too long")
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try:
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ret = buffer.decode('utf-8')
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x = ret.find('\n')
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if x > 0:
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return ret[:x]
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except UnicodeDecodeError:
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pass
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def handleOneConnection(self, conn):
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log_uuid = self.get_command(conn)
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# use path split to make use the input isn't trying to be clever
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# and construct some path like /tmp/console-/../../something
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log_uuid = os.path.split(log_uuid.rstrip())[-1]
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# FIXME: this won't notice disconnects until it tries to send
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console = None
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try:
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while True:
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if console is not None:
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try:
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console.file.close()
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except Exception:
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pass
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while True:
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console = self.chunkConsole(conn, log_uuid)
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if console:
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break
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conn.send('[Zuul] Log not found\n')
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time.sleep(0.5)
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while True:
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if self.followConsole(console, conn):
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break
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else:
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return
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finally:
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try:
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conn.close()
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except Exception:
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pass
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def get_inode(port_number=19885):
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for netfile in ('/proc/net/tcp6', '/proc/net/tcp'):
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if not os.path.exists(netfile):
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continue
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with open(netfile) as f:
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# discard header line
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f.readline()
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for line in f:
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# sl local_address rem_address st tx_queue:rx_queue tr:tm->when
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# retrnsmt uid timeout inode
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fields = line.split()
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# Format is localaddr:localport in hex
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port = int(fields[1].split(':')[1], base=16)
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if port == port_number:
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return fields[9]
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def get_pid_from_inode(inode):
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my_euid = os.geteuid()
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exceptions = []
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for d in os.listdir('/proc'):
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try:
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try:
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int(d)
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except Exception:
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continue
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d_abs_path = os.path.join('/proc', d)
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if os.stat(d_abs_path).st_uid != my_euid:
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continue
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fd_dir = os.path.join(d_abs_path, 'fd')
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if os.path.exists(fd_dir):
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if os.stat(fd_dir).st_uid != my_euid:
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continue
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for fd in os.listdir(fd_dir):
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try:
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fd_path = os.path.join(fd_dir, fd)
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if os.path.islink(fd_path):
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target = os.readlink(fd_path)
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if '[' + inode + ']' in target:
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return d, exceptions
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except Exception as e:
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exceptions.append(e)
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except Exception as e:
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exceptions.append(e)
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return None, exceptions
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def test():
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s = Server(LOG_STREAM_FILE, LOG_STREAM_PORT)
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s.run()
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def main():
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module = AnsibleModule(
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argument_spec=dict(
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path=dict(default=LOG_STREAM_FILE),
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port=dict(default=LOG_STREAM_PORT, type='int'),
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state=dict(default='present', choices=['absent', 'present']),
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)
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)
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p = module.params
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path = p['path']
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port = p['port']
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state = p['state']
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if state == 'present':
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if daemonize():
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module.exit_json()
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s = Server(path, port)
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s.run()
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else:
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pid = None
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exceptions = []
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inode = get_inode()
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if not inode:
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module.fail_json(
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msg="Could not find inode for port",
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exceptions=[])
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pid, exceptions = get_pid_from_inode(inode)
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if not pid:
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except_strings = [str(e) for e in exceptions]
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module.fail_json(
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msg="Could not find zuul_console process for inode",
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exceptions=except_strings)
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try:
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subprocess.check_output(['kill', pid])
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except subprocess.CalledProcessError as e:
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module.fail_json(
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msg="Could not kill zuul_console pid",
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exceptions=[str(e)])
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for fn in glob.glob(LOG_STREAM_FILE.format(log_uuid='*')):
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try:
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os.unlink(fn)
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except Exception as e:
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module.fail_json(
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msg="Could not remove logfile {fn}".format(fn=fn),
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exceptions=[str(e)])
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module.exit_json()
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from ansible.module_utils.basic import * # noqa
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from ansible.module_utils.basic import AnsibleModule
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if __name__ == '__main__':
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main()
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# test()
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