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WebSVN – planix.SVN – Blame – /os/branches/feature_fixcpp/sys/src/cmd/ip/linklocal.c – Rev 2

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/*
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 * linklocal - print ipv6 link-local or 6to4 address of a mac address.
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 * eui is ieee's extended unique identifier, per rfc2373.
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 */
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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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	Mac0mcast	= 1<<0,		/* multicast address */
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	Mac0localadm	= 1<<1,		/* locally-administered address, */
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	V60globaladm	= 1<<1,		/* but ipv6 reverses the meaning */
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};
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static char *v4_6to4;
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static void
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usage(void)
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{
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	fprint(2, "usage: %s [-t ipv4] ether...\n", argv0);
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	exits("usage");
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}
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void
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ea2eui64(uchar *lla, uchar *ea)
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{
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	*lla++ = *ea++ | V60globaladm;	/* oui (company id) */
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	*lla++ = *ea++;			/* " */
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	*lla++ = *ea++;			/* " */
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	*lla++ = 0xFF;			/* mac-48 in eui-64 (sic) */
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	*lla++ = 0xFE;			/* " */
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	*lla++ = *ea++;			/* manufacturer-assigned */
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	*lla++ = *ea++;			/* " */
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	*lla = *ea;			/* " */
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}
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void
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eaip26to4(uchar *lla, uchar *ea, uchar *ipv4)
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{
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	*lla++ = 0x20;			/* 6to4 address */
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	*lla++ = 0x02;			/* " */
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	memmove(lla, ipv4, IPv4addrlen);
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	lla += IPv4addrlen;
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	memset(lla, 0, 2);
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	ea2eui64(lla + 2, ea);
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}
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void
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ea2lla(uchar *lla, uchar *ea)
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{
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	*lla++ = 0xFE;			/* link-local v6 */
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	*lla++ = 0x80;			/* " */
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	memset(lla, 0, 6);
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	ea2eui64(lla + 6, ea);
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}
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static void
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process(char *ether)
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{
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	uchar ethaddr[6], ipaddr[IPaddrlen], ipv4[IPv4addrlen];
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	if (parseether(ethaddr, ether) < 0)
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		sysfatal("%s: not an ether address", ether);
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	if (v4_6to4) {
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		v4parseip(ipv4, v4_6to4);
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		eaip26to4(ipaddr, ethaddr, ipv4);
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	} else
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		ea2lla(ipaddr, ethaddr);
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	print("%I\n", ipaddr);
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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 i;
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	ARGBEGIN {
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	case 't':
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		v4_6to4 = EARGF(usage());
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		break;
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	default:
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		usage();
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		break;
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	} ARGEND
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	fmtinstall('I', eipfmt);
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	if (argc <= 0)
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		usage();
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	for (i = 0; i < argc; i++)
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		process(argv[i]);
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	exits(0);
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}