Function isRoutableIP

server/utils.go:904–932

(ipStr string)

var privateIPBlocks []*net.IPNet

func isRoutableIP(ipStr string) bool {
	ip := net.ParseIP(ipStr)
	if ip == nil {
		return false
	}

	if ip.IsLoopback() || ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() {
		return false
	}

	if privateIPBlocks == nil {
		for _, cidr := range []string{
			"10.0.0.0/8",     // RFC1918
			"172.16.0.0/12",  // RFC1918
			"192.168.0.0/16", // RFC1918
			"fc00::/7",       // RFC4193, IPv6 unique local addr
		} {
			_, block, _ := net.ParseCIDR(cidr)
			privateIPBlocks = append(privateIPBlocks, block)
		}
	}

	for _, block := range privateIPBlocks {
		if block.Contains(ip) {
			return false
		}
	}
	return true
}