/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ /* send wake-on-lan magic ethernet packet */#include <u.h>#include <libc.h>#include <ip.h> enum {	Eaddrlen = 6,	/* 48 bits */}; typedef struct Wolpack Wolpack;struct Wolpack{	uchar	magic[6];	uchar	macs[16][Eaddrlen];	char	pass[6+1];}; int verbose; voidusage(void){	fprint(2, "usage: wol [-v] [-a dialstr] [-c password] macaddr\n");	exits("usage");} voidfillmac(Wolpack *w, uchar *mac){	int i; 	for(i = 0; i < nelem(w->macs); i++)		memmove(w->macs[i], mac, Eaddrlen);} voiddumppack(Wolpack *w){	int i; 	print("packet: [\n");	print("\t%E\n", w->magic);	for(i = 0; i < nelem(w->macs); i++)		print("\t%E\n", w->macs[i]);	print("\t%6s\n", w->pass);	print("]\n");} voidmain(int argc, char* argv[]){	int fd, nw;	char *argmac, *pass, *address;	uchar mac[Eaddrlen];	static Wolpack w = {		.magic { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, }	}; 	address = pass = nil;	fmtinstall('E', eipfmt); 	ARGBEGIN{	case 'a':		address = EARGF(usage());		break;	case 'c':		pass = EARGF(usage());		break;	case 'v':		verbose++;		break;	default:		usage();	}ARGEND 	if(argc != 1)		usage();	argmac = argv[0];	if(verbose)		print("mac is %s, pass is %s\n", argmac, pass); 	parseether(mac, argmac);	fillmac(&w, mac);	if(pass){		if(strlen(pass) > 6)			sysfatal("password greater than 6 bytes");		strcpy(w.pass, pass);	}	if(verbose)		dumppack(&w); 	if(!address)		address = "udp!255.255.255.255!0"; 	fd = dial(address, nil, nil, nil);	if(fd < 0)		sysfatal("%s: %r", address);	nw = write(fd, &w, sizeof w);	if(nw != sizeof w)		sysfatal("error sending: %r");	exits(0);}