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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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void
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usage(void)
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{
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	fprint(2, "usage: %s [-x netmtpt]\n", argv0);
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	exits("usage");
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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, cfd, n;
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	char buf[4096], data[128], devdir[40], net[32];
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	setnetmtpt(net, sizeof net, nil);
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	ARGBEGIN{
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	case 'x':
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		setnetmtpt(net, sizeof net, EARGF(usage()));
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		break;
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	}ARGEND;
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	sprint(data, "%s/udp!*!echo", net);
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	cfd = announce(data, devdir);
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	if(cfd < 0)
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		sysfatal("can't announce %s: %r", data);
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	if(fprint(cfd, "headers") < 0)
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		sysfatal("can't set header mode: %r");
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	sprint(data, "%s/data", devdir);
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	fd = open(data, ORDWR);
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	if(fd < 0)
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		sysfatal("open %s: %r", data);
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	while ((n = read(fd, buf, sizeof buf)) > 0)
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		write(fd, buf, n);
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	if (n < 0)
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		sysfatal("error reading: %r");
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	exits(0);
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}