github.com/turingchain2020/turingchain@v1.1.21/system/p2p/dht/protocol/peer/ip.go (about)

     1  package peer
     2  
     3  import (
     4  	"net"
     5  )
     6  
     7  /*
     8  tcp/ip协议中，专门保留了三个IP地址区域作为私有地址，其地址范围如下：
     9  10.0.0.0/8：10.0.0.0～10.255.255.255
    10  172.16.0.0/12：172.16.0.0～172.31.255.255
    11  192.168.0.0/16：192.168.0.0～192.168.255.255
    12  */
    13  func isPublicIP(ip string) bool {
    14  	IP := net.ParseIP(ip)
    15  	if IP == nil || IP.IsLoopback() || IP.IsLinkLocalMulticast() || IP.IsLinkLocalUnicast() {
    16  		return false
    17  	}
    18  	if ip4 := IP.To4(); ip4 != nil {
    19  		switch true {
    20  		case ip4[0] == 10:
    21  			return false
    22  		case ip4[0] == 172 && ip4[1] >= 16 && ip4[1] <= 31:
    23  			return false
    24  		case ip4[0] == 192 && ip4[1] == 168:
    25  			return false
    26  		default:
    27  			return true
    28  		}
    29  	}
    30  	return false
    31  }
    32  
    33  // LocalIPs return all non-loopback IPv4 addresses
    34  func localIPv4s() ([]string, error) {
    35  	var ips []string
    36  	addrs, err := net.InterfaceAddrs()
    37  	if err != nil {
    38  		return ips, err
    39  	}
    40  
    41  	for _, a := range addrs {
    42  		if ipnet, ok := a.(*net.IPNet); ok && !ipnet.IP.IsLoopback() && ipnet.IP.To4() != nil {
    43  			ips = append(ips, ipnet.IP.String())
    44  		}
    45  	}
    46  
    47  	return ips, nil
    48  }