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wake.pl 3.5KB

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  1. #!/usr/bin/perl -w
  2. #
  3. # If called as wake.pl -f file it reads lines of the form
  4. #
  5. # aa:bb:cc:dd:ee;ff 12.34.56.78 or
  6. # aa:bb:cc:dd:ee:ff foo.bar.com
  7. # aa:bb:cc:dd:ee:ff
  8. #
  9. # which are MAC addresses and hostnames of NICs to send a wakeup packet.
  10. # In the first two cases, unicast is used (and root permission may be
  11. # required if the ARP cache needs to be injected with a mapping).
  12. # In the third case, broadcast is used, and anybody can run the command.
  13. # Comments in the file start with #.
  14. #
  15. # Or MAC addresses can be specified on the command line
  16. #
  17. # wake.pl aa.bb.cc.dd.ee.ff
  18. #
  19. # Or both can be used:
  20. #
  21. # wake.pl -f addresses.cfg 11:22:33:44:55:66
  22. #
  23. # This program may have to be run with superuser privilege because it
  24. # may need to inject an ARP entry into the cache.
  25. # Be careful, you could corrupt valid entries if those NICs are
  26. # already active.
  27. #
  28. # Perl version by ken_yap@users.sourceforge.net after DOS/Windows C version posted by
  29. # Steve_Marfisi@3com.com on the Netboot mailing list
  30. # Released under GNU Public License, 2000-01-08
  31. # Added switch -q for quiet mode, changed Getopt usage to work with older versions,
  32. # added switch -u for unicast mode, now default is always broadcast mode,
  33. # added switch -s for seach pattern so you could filter entries from file.
  34. # Guenter.Knauf@dialup.soco.de, 2000-10-14
  35. #
  36. use Getopt::Std;
  37. use Socket;
  38. getopts('quf:s:');
  39. if (defined($opt_f)) {
  40. unless (open(F, $opt_f)) {
  41. print STDERR "open: $opt_f: $!\n";
  42. } else {
  43. while (<F>) {
  44. next if /^\s*#/; # skip comments
  45. ($mac, $ip) = split;
  46. next if !defined($mac) or $mac eq '';
  47. next if defined($opt_s) and (!/$opt_s/);
  48. if (!defined($ip) or $ip eq '' or !$opt_u) {
  49. &send_broadcast_packet($mac);
  50. } else {
  51. &send_unicast_packet($mac, $ip);
  52. }
  53. }
  54. close(F);
  55. }
  56. }
  57. while (@ARGV) {
  58. send_broadcast_packet(shift(@ARGV));
  59. }
  60. sub send_broadcast_packet {
  61. ($mac) = @_;
  62. if ($mac !~ /^[\da-f]{2}:[\da-f]{2}:[\da-f]{2}:[\da-f]{2}:[\da-f]{2}:[\da-f]{2}$/i) {
  63. print STDERR "Malformed MAC address $mac\n";
  64. return;
  65. }
  66. # Remove colons
  67. $mac =~ tr/://d;
  68. # Magic packet is 6 bytes of FF followed by the MAC address 16 times
  69. $magic = ("\xff" x 6) . (pack('H12', $mac) x 16);
  70. # Create socket
  71. socket(S, PF_INET, SOCK_DGRAM, getprotobyname('udp'))
  72. or die "socket: $!\n";
  73. # Enable broadcast
  74. setsockopt(S, SOL_SOCKET, SO_BROADCAST, 1)
  75. or die "setsockopt: $!\n";
  76. # Send the wakeup packet
  77. if (!$opt_q) {
  78. print "Sending wakeup packet to MAC address $mac";
  79. print " ($ip)" if (defined($ip));
  80. print "\n";
  81. }
  82. defined(send(S, $magic, 0, sockaddr_in(0x2fff, INADDR_BROADCAST)))
  83. or print STDERR "send: $!\n";
  84. close(S);
  85. }
  86. sub send_unicast_packet {
  87. ($mac, $ip) = @_;
  88. if (!defined($iaddr = inet_aton($ip))) {
  89. print STDERR "Cannot resolve $ip\n";
  90. return;
  91. }
  92. if ($mac !~ /^[\da-f]{2}:[\da-f]{2}:[\da-f]{2}:[\da-f]{2}:[\da-f]{2}:[\da-f]{2}$/i) {
  93. print STDERR "Malformed MAC address $mac\n";
  94. return;
  95. }
  96. # Inject entry into ARP table, in case it's not there already
  97. system("arp -s $ip $mac") == 0
  98. or print STDERR "Warning: arp command failed, you need to be root\n";
  99. # Remove colons
  100. $mac =~ tr/://d;
  101. # Magic packet is 6 bytes of FF followed by the MAC address 16 times
  102. $magic = ("\xff" x 6) . (pack('H12', $mac) x 16);
  103. # Create socket
  104. socket(S, PF_INET, SOCK_DGRAM, getprotobyname('udp'))
  105. or die "socket: $!\n";
  106. # Send the wakeup packet
  107. print "Sending wakeup packet to $ip at MAC address $mac\n" if (!$opt_q);
  108. defined(send(S, $magic, 0, sockaddr_in(0x2fff, $iaddr)))
  109. or print STDERR "send: $!\n";
  110. close(S);
  111. }