/usr/bin/powerwake is in powerwake 2.21-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 | #! /usr/bin/python
#
# powerwake - a smart remote host waking utility, supporting multiple
# waking methods, and caching known hostnames and addresses
#
# Copyright (C) 2009 Canonical Ltd.
#
# Authors: Dustin Kirkland <kirkland@canonical.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import commands
import os
import re
import socket
import struct
import sys
import getopt
global DEBUG, PKG, RC, HOME
DEBUG = 0
PKG = "powerwake"
RC = 0
HOME = os.getenv("HOME")
short_opts = 'hb:m:'
long_opts = ['help', 'broadcast=', 'method=']
usage_string = "Usage:\n powerwake [-b|--broadcast BROADCAST_IP] [-m|--method METHOD] TARGET_MAC|TARGET_IP|TARGET_HOST"
# Generic debug function
def debug(level, msg):
if DEBUG >= level:
print("%s" % msg)
# Generic error function
def error(msg):
debug(0, "ERROR: %s" % msg)
ERROR = 1
# Generic warning function
def warning(msg):
debug(0, "WARNING: %s" % msg)
# Generic info function
def info(msg):
debug(0, "INFO: %s" % msg)
def wakeonlan(mac):
nonhex = re.compile('[^0-9a-fA-F]')
mac = nonhex.sub('', mac)
if len(mac) != 12:
error("Malformed mac address [%s]" % mac)
info("Sending magic packet to: [%s]" % mac)
# We should cache this to /var/cache/powerwake/ethers,
# in case arp entry isn't available next time
data = ''.join(['FFFFFFFFFFFF', mac * 16])
send_data = ''
for i in range(0, len(data), 2):
send_data = ''.join([send_data, struct.pack('B', int(data[i: i + 2], 16))])
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
sock.sendto(send_data, (broadcast, 7))
except:
error("Network is unreachable")
def is_ip(ip):
r1 = re.compile('^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$')
if r1.match(ip):
return 1
else:
return 0
def is_mac(mac):
r1 = re.compile('^[0-9a-fA-F]{12}$')
r2 = re.compile('^[0-9a-fA-F]{2}.[0-9a-fA-F]{2}.[0-9a-fA-F]{2}.[0-9a-fA-F]{2}.[0-9a-fA-F]{2}.[0-9a-fA-F]{2}$')
if r1.match(mac) or r2.match(mac):
return 1
else:
return 0
# Source the cached, known arp entries
def get_arp_cache():
host_to_mac = {}
for file in ["/var/cache/%s/ethers" % PKG, "/etc/ethers", "%s/.cache/ethers" % HOME]:
if os.path.exists(file):
f = open(file, 'r')
for i in f.readlines():
try:
(m, h) = i.split()
host_to_mac[h] = m
except:
pass
f.close()
return host_to_mac
# Source the current, working arp table
def get_arp_current(host_to_mac):
# Load hostnames
for i in os.popen("/usr/sbin/arp"):
m = i.split()[2]
h = i.split()[0]
if is_mac(m):
host_to_mac[h] = m
# Load ip addresses
for i in os.popen("/usr/sbin/arp -n"):
m = i.split()[2]
h = i.split()[0]
if is_mac(m):
host_to_mac[h] = m
return host_to_mac
def write_arp_cache(host_to_mac):
if not os.access("%s/.cache/" % HOME, os.W_OK):
return
if not os.path.exists("%s/.cache/" % HOME):
os.makedirs("%s/.cache/" % HOME)
f = open("%s/.cache/ethers" % HOME, 'a')
f.close()
for file in ["/var/cache/%s/ethers" % PKG, "%s/.cache/ethers" % HOME]:
if os.access(file, os.W_OK):
f = open(file, 'w')
for h in host_to_mac:
if is_mac(host_to_mac[h]):
f.write("%s %s\n" % (host_to_mac[h], h))
f.close()
def get_arp_hash():
host_to_mac = get_arp_cache()
host_to_mac = get_arp_current(host_to_mac)
write_arp_cache(host_to_mac)
return host_to_mac
# TODO:
# Parameters to add:
# --list - list known mac/ip-host combinations
# --clear - clear the cache
if __name__ == '__main__':
# set up defaults
broadcast = '<broadcast>'
method = 'wol'
# parse getopt options
try:
opts, args = getopt.getopt(sys.argv[1:], short_opts, long_opts)
except:
print(usage_string)
exit(1)
for name, value in opts:
if name in ('-b', '--broadcast'):
if is_ip(value):
broadcast = value
else:
error("Value passed to " + name + " is not a valid broadcast address [%s]" % value)
print(usage_string)
exit(1)
elif name in ('-m', '--method'):
method = value
elif name in ('-h', '--help'):
print(usage_string)
exit(0)
# if args is less than one, we don't have a host to wake up
if len(args) < 1:
error("Please provide one or more MAC addresses, IP addresses, or Hostnames")
print(usage_string)
exit(1)
# Process command line parameters
for i in args:
# If parameter matches a system with a static configuration, use it!
# ^^^ Not yet implemented, default to wake-on-lan method for now
if method == "wol":
if is_mac(i):
# this appears to be a mac address, just use it
m = i
pass
else:
# Retrieve the mac cache
host_to_mac = get_arp_cache()
if host_to_mac.has_key(i):
# mac found in the hash
info("Trying to wake host: [%s]" % i)
m = host_to_mac[i]
else:
# not in the cache, do the expensive arp search
host_to_mac = get_arp_hash()
if host_to_mac.has_key(i):
# mac found in the hash
info("Trying to wake host: [%s]" % i)
m = host_to_mac[i]
else:
# cannot autodetect the mac address
error("Could not determine the MAC address of [%s]" % i)
continue
if is_mac(m):
wakeonlan(m)
else:
error("Could not wake host [%s]" % m)
else:
error("Unsupported method [%s]" % method)
RC=1
sys.exit(RC)
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