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#!/usr/bin/env python3
# Licensed under GPLv3
#
# Simple script to query the management interface of a running n2n edge node
import argparse
import socket
import json
import collections
class JsonUDP():
"""encapsulate communication with the edge"""
def __init__(self, port):
self.address = "127.0.0.1"
self.port = port
self.tag = 0
self.key = None
self.debug = False
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.sock.settimeout(1)
def _next_tag(self):
tagstr = str(self.tag)
self.tag = (self.tag + 1) % 1000
return tagstr
def _cmdstr(self, msgtype, cmdline):
"""Create the full command string to send"""
tagstr = self._next_tag()
options = [tagstr]
if self.key is not None:
options += ['1'] # Flags set for auth key field
options += [self.key]
optionsstr = ':'.join(options)
return tagstr, ' '.join((msgtype, optionsstr, cmdline))
def _rx(self, tagstr):
"""Wait for rx packets"""
# TODO: there are no timeouts with any of the recv calls
data, _ = self.sock.recvfrom(1024)
data = json.loads(data.decode('utf8'))
# TODO: We assume the first packet we get will be tagged for us
# and be either an "error" or a "begin"
assert(data['_tag'] == tagstr)
if data['_type'] == 'error':
raise ValueError('Error: {}'.format(data['error']))
assert(data['_type'] == 'begin')
# Ideally, we would confirm that this is our "begin", but that
# would need the cmd passed into this method, and that would
# probably require parsing the cmdline passed to us :-(
# assert(data['cmd'] == cmd)
result = list()
error = None
while True:
data, _ = self.sock.recvfrom(1024)
data = json.loads(data.decode('utf8'))
if data['_tag'] != tagstr:
# this packet is not for us, ignore it
continue
if data['_type'] == 'error':
# we still expect an end packet, so save the error
error = ValueError('Error: {}'.format(data['error']))
continue
if data['_type'] == 'end':
if error:
raise error
return result
if data['_type'] != 'row':
raise ValueError('Unknown data type {} from '
'edge'.format(data['_type']))
# remove our boring metadata
del data['_tag']
del data['_type']
if self.debug:
print(data)
result.append(data)
def _call(self, msgtype, cmdline):
"""Perform a rpc call"""
tagstr, msgstr = self._cmdstr(msgtype, cmdline)
self.sock.sendto(msgstr.encode('utf8'), (self.address, self.port))
return self._rx(tagstr)
def read(self, cmdline):
return self._call('r', cmdline)
def write(self, cmdline):
return self._call('w', cmdline)
def str_table(rows, columns, orderby):
"""Given an array of dicts, do a simple table print"""
result = list()
widths = collections.defaultdict(lambda: 0)
if len(rows) == 0:
# No data to show, be sure not to truncate the column headings
for col in columns:
widths[col] = len(col)
else:
for row in rows:
for col in columns:
if col in row:
widths[col] = max(widths[col], len(str(row[col])))
for col in columns:
if widths[col] == 0:
widths[col] = 1
result += "{:{}.{}} ".format(col, widths[col], widths[col])
result += "\n"
if orderby is not None:
rows = sorted(rows, key=lambda row: row.get(orderby, 0))
for row in rows:
for col in columns:
if col in row:
data = row[col]
else:
data = ''
result += "{:{}} ".format(data, widths[col])
result += "\n"
return ''.join(result)
def subcmd_show_supernodes(rpc, args):
rows = rpc.read('supernodes')
columns = [
'version',
'current',
'macaddr',
'sockaddr',
'uptime',
]
return str_table(rows, columns, args.orderby)
def subcmd_show_edges(rpc, args):
rows = rpc.read('edges')
columns = [
'mode',
'ip4addr',
'macaddr',
'sockaddr',
'desc',
]
return str_table(rows, columns, args.orderby)
def subcmd_show_help(rpc, args):
result = 'Commands with pretty-printed output:\n\n'
for name, cmd in subcmds.items():
result += "{:12} {}\n".format(name, cmd['help'])
result += "\n"
result += "Possble remote commands:\n"
result += "(those without a pretty-printer will pass-through)\n\n"
rows = rpc.read('help')
for row in rows:
result += "{:12} {}\n".format(row['cmd'], row['help'])
return result
subcmds = {
'help': {
'func': subcmd_show_help,
'help': 'Show available commands',
},
'supernodes': {
'func': subcmd_show_supernodes,
'help': 'Show the list of supernodes',
},
'edges': {
'func': subcmd_show_edges,
'help': 'Show the list of edges/peers',
},
}
def subcmd_default(rpc, args):
"""Just pass command through to edge"""
cmdline = ' '.join([args.cmd] + args.args)
if args.write:
rows = rpc.write(cmdline)
else:
rows = rpc.read(cmdline)
return json.dumps(rows, sort_keys=True, indent=4)
def main():
ap = argparse.ArgumentParser(
description='Query the running local n2n edge')
ap.add_argument('-t', '--mgmtport', action='store', default=5644,
help='Management Port (default=5644)', type=int)
ap.add_argument('-k', '--key', action='store',
help='Password for mgmt commands')
ap.add_argument('-d', '--debug', action='store_true',
help='Also show raw internal data')
ap.add_argument('--raw', action='store_true',
help='Force cmd to avoid any pretty printing')
ap.add_argument('--orderby', action='store',
help='Hint to a pretty printer on how to sort')
group = ap.add_mutually_exclusive_group()
group.add_argument('--read', action='store_true',
help='Make a read request (default)')
group.add_argument('--write', action='store_true',
help='Make a write request (only to non pretty'
'printed cmds)')
ap.add_argument('cmd', action='store',
help='Command to run (try "help" for list)')
ap.add_argument('args', action='store', nargs="*",
help='Optional args for the command')
args = ap.parse_args()
if args.raw or (args.cmd not in subcmds):
func = subcmd_default
else:
func = subcmds[args.cmd]['func']
rpc = JsonUDP(args.mgmtport)
rpc.debug = args.debug
rpc.key = args.key
try:
result = func(rpc, args)
except socket.timeout as e:
print(e)
exit(1)
print(result)
if __name__ == '__main__':
main()