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#!/usr/bin/python3
import os, sys, signal, socket, selectors, time, tty
# basic config
# SOCKET_FILE = "/run/pk/pk.sock"
# PID_FILE = "/run/pk/pk.pid"
# DAEMON_FILE = "/usr/bin/pkd"
# LOG_FILE = "/var/log/pk.log"
# KEY_FILE = "/etc/pk/server_key.json"
# DAEMON_PORT = 2236
# DAEMON_BITS = 4096
SOCKET_FILE = "./pk.sock"
PID_FILE = "./pk.pid"
DAEMON_FILE = "python pkd.py"
LOG_FILE = "./pk.log"
KEY_FILE = "./default_key.json"
DAEMON_PORT = 2236
DAEMON_BITS = 4096
def isd_running():
return os.path.isfile(PID_FILE)
def startd():
return os.system('%s %s %s %s %d %d %s' % (DAEMON_FILE, SOCKET_FILE,\
PID_FILE, LOG_FILE, \
DAEMON_BITS, DAEMON_PORT,\
KEY_FILE))
def signald(sig):
if not isd_running():
return False
pidf = open(PID_FILE, 'r')
pid = int(pidf.read().strip())
pidf.close()
try:
os.kill(pid, sig)
except ProcessLookupError:
os.remove(PID_FILE)
return False
return True
def pnnl(s):
sys.stdout.write(s)
sys.stdout.flush()
def print_help():
print('Usage: %s COMMAND [OPTIONS]...' % sys.argv[0])
print('Dispatch COMMAND to the PK Daemon.')
print('Example: %s attach' % sys.argv[0])
print()
print('Commands:')
print('\tstart\t\t\t\tstart the daemon')
print('\tstop\t\t\t\tstop the daemon')
print('\trestart\t\t\t\trestart the daemon')
print('\tattach\t\t\t\tcontrol the daemon via attached screen')
def start_cmd():
return startd() == 0
def stop_cmd():
return signald(signal.SIGTERM)
def attach_cmd():
if not isd_running():
return False
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
try:
sock.connect(SOCKET_FILE)
except:
sock.close()
return False
sel = selectors.DefaultSelector()
sel.register(sys.stdin.fileno(), selectors.EVENT_READ, 0)
sel.register(sock, selectors.EVENT_READ, 1)
attached = True
pty_mode = False
stdin_mode = None
while attached:
events = sel.select()
for event, mask in events:
if event.data == 0:
try:
data = os.read(sys.stdin.fileno(), 1024)
except Exception:
data = False
if not data:
attached = False
break
elif pty_mode:
try:
sock.sendall(data)
continue
except:
attached = False
break
elif data.strip() == b'detach':
try:
sock.sendall(b'\xde\xad')
except:
pass
attached = False
break
elif data.strip() == b'clear':
os.system('clear')
data = b'\xc0\xdeprompt'
elif len(data.strip()) < 1:
data = b'\xc0\xdeprompt'
try:
sock.sendall(data)
except:
attached = False
break
else:
try:
data = sock.recv(1024)
except Exception:
data = False
if not data or data == b'\xde\xad':
if pty_mode:
tty.tcsetattr(sys.stdin.fileno(), tty.TCSAFLUSH, stdin_mode)
pty_mode = False
print('turned off pty mode due to remote detach')
attached = False
break
elif pty_mode and data[:6] == b'\xc0\xdenpty':
tty.tcsetattr(sys.stdin.fileno(), tty.TCSAFLUSH, stdin_mode)
pty_mode = False
print('turned off pty mode due to npty command')
elif not pty_mode and data == b'\xc0\xdepty':
pty_mode = True
stdin_mode = tty.tcgetattr(sys.stdin.fileno())
tty.setraw(sys.stdin.fileno())
else:
if data[:6] == b'\xc0\xdenpty':
pnnl(str(data[6:], 'utf-8'))
elif data[:2] == b'\xc0\xde':
print('Received bogus code from server', data)
else:
pnnl(str(data, 'utf-8'))
sel.close()
sock.close()
if pty_mode:
tty.tcsetattr(sys.stdin.fileno(), tty.TCSAFLUSH, stdin_mode)
return True
def main():
if len(sys.argv) < 2 or sys.argv[1] == 'help':
print_help()
elif sys.argv[1] == 'start':
if len(sys.argv) > 2:
print('Unrecognized option(s):', *sys.argv[2:])
print_help()
return
if start_cmd():
print('Daemon started.')
else:
print('Failed to start daemon.')
elif sys.argv[1] == 'stop':
if len(sys.argv) > 2:
print('Unrecognized option(s):', *sys.argv[2:])
print_help()
return
if stop_cmd():
print('Dispatched stop command to daemon.')
else:
print('Failed to stop daemon; ensure it is running.')
elif sys.argv[1] == 'restart':
if len(sys.argv) > 2:
print('Unrecognized option(s):', *sys.argv[2:])
print_help()
return
if stop_cmd():
print('Dispatched stop command to daemon.')
time.sleep(2)
else:
print('Daemon was not running so will not be stopped.')
if start_cmd():
print('Daemon started.')
else:
print('Failed to start daemon.')
elif sys.argv[1] == 'attach':
if len(sys.argv) > 2:
print('Unrecognized option(s):', *sys.argv[2:])
print_help()
return
if attach_cmd():
print('Detached from daemon; quitting.')
else:
print('Cannot contact daemon; ensure it is running and you have access to it.')
else:
print('Unrecognized command:', sys.argv[1])
print_help()
if __name__ == '__main__':
main()
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