github.com/ooni/psiphon/tunnel-core@v0.0.0-20230105123940-fe12a24c96ee/oovendor/quic-go/internal/utils/ip.go (about)

     1  package utils
     2  
     3  import "net"
     4  
     5  func IsIPv4(ip net.IP) bool {
     6  	// If ip is not an IPv4 address, To4 returns nil.
     7  	// Note that there might be some corner cases, where this is not correct.
     8  	// See https://stackoverflow.com/questions/22751035/golang-distinguish-ipv4-ipv6.
     9  	return ip.To4() != nil
    10  }