How to judge whether one network segment belongs to the subnet of another network segment in GO language

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1. Verify whether the network segment is legal. 1.1.The function import ("fmt"net") func IsNetWorkOk (network string) bool {_, _, err: = net.ParseCIDR (network) if err! = nil {return false} return true}

1.2 Analysis

The first step is to change split into ip and subnet mask.

The main principle is to make a judgment after it is changed to binary.

Both ipv4 and ipv6 can be verified. If you only want to verify ipv4, you can call the parseIPv4 method.

1.3 the main function runs the test func main () {ip: = "100.4.11.3 result 24" result: = IsNetWorkOk (ip) fmt.Println (result)} 2. Verify whether ip is legal 2.2.2.Analysis of function func IsIpOk (ip string) bool {address: = net.ParseIP (ip) if address = = nil {return false} return true} 2.2Function

Change dotted decimal to binary to determine whether it is legal:

2.3 the main function runs the test func main () {ip: = "100.4.11.34" result: = IsIpOk (ip) fmt.Println (result)} 3. Judge whether one is the subnet of the other. Function func ContainsCIDR (a, b * net.IPNet) bool {ones1, _: = a.Mask.Size () ones2, _: = b.Mask.Size () return ones1