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/* send wake-on-lan magic ethernet packet */
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#include <u.h>
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#include <libc.h>
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#include <ip.h>
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enum {
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	Eaddrlen = 6,	/* 48 bits */
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};
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typedef struct Wolpack Wolpack;
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struct Wolpack{
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	uchar	magic[6];
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	uchar	macs[16][Eaddrlen];
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	char	pass[6+1];
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};
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int verbose;
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void
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usage(void)
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{
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	fprint(2, "usage: wol [-v] [-a dialstr] [-c password] macaddr\n");
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	exits("usage");
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}
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void
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fillmac(Wolpack *w, uchar *mac)
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{
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	int i;
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	for(i = 0; i < nelem(w->macs); i++)
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		memmove(w->macs[i], mac, Eaddrlen);
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}
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void
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dumppack(Wolpack *w)
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{
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	int i;
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	print("packet: [\n");
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	print("\t%E\n", w->magic);
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	for(i = 0; i < nelem(w->macs); i++)
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		print("\t%E\n", w->macs[i]);
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	print("\t%6s\n", w->pass);
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	print("]\n");
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}
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void
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main(int argc, char* argv[])
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{
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	int fd, nw;
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	char *argmac, *pass, *address;
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	uchar mac[Eaddrlen];
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	static Wolpack w = {
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		.magic { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, }
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	};
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	address = pass = nil;
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	fmtinstall('E', eipfmt);
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	ARGBEGIN{
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	case 'a':
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		address = EARGF(usage());
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		break;
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	case 'c':
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		pass = EARGF(usage());
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		break;
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	case 'v':
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		verbose++;
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		break;
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	default:
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		usage();
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	}ARGEND
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	if(argc != 1)
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		usage();
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	argmac = argv[0];
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	if(verbose)
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		print("mac is %s, pass is %s\n", argmac, pass);
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	parseether(mac, argmac);
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	fillmac(&w, mac);
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	if(pass){
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		if(strlen(pass) > 6)
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			sysfatal("password greater than 6 bytes");
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		strcpy(w.pass, pass);
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	}
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	if(verbose)
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		dumppack(&w);
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	if(!address)
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		address = "udp!255.255.255.255!0";
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	fd = dial(address, nil, nil, nil);
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	if(fd < 0)
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		sysfatal("%s: %r", address);
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	nw = write(fd, &w, sizeof w);
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	if(nw != sizeof w)
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		sysfatal("error sending: %r");
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	exits(0);
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}