egutierrez
bd9383fd82
12 funciones puras con implementación real: HashSHA256, HashMD5, EntropyShannon, IsBase64, IsHex, ExtractURLs, ParseIPCIDR, IPInRange, NormalizeURL, DetectSQLInjection, LevenshteinDistance, JaccardSimilarity 4 funciones impuras con implementación real (stdlib): LookupWhois, ResolveDNS, FetchHTTPHeaders, ScanPortTCP Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
45 lines
1.0 KiB
Go
45 lines
1.0 KiB
Go
package cybersecurity
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"fmt"
|
|
"net"
|
|
)
|
|
|
|
// ParseIPCIDR parsea una notacion CIDR y devuelve la direccion de red, broadcast, cantidad de hosts y error.
|
|
func ParseIPCIDR(cidr string) (network string, broadcast string, hosts int, err error) {
|
|
ip, ipNet, err := net.ParseCIDR(cidr)
|
|
if err != nil {
|
|
return "", "", 0, fmt.Errorf("CIDR invalido: %w", err)
|
|
}
|
|
|
|
// Solo soportamos IPv4
|
|
ip4 := ip.To4()
|
|
if ip4 == nil {
|
|
return "", "", 0, fmt.Errorf("solo se soporta IPv4")
|
|
}
|
|
|
|
mask := ipNet.Mask
|
|
networkIP := ipNet.IP.To4()
|
|
network = networkIP.String()
|
|
|
|
// Calcular broadcast
|
|
broadcastIP := make(net.IP, 4)
|
|
for i := 0; i < 4; i++ {
|
|
broadcastIP[i] = networkIP[i] | ^mask[i]
|
|
}
|
|
broadcast = broadcastIP.String()
|
|
|
|
// Calcular hosts usables
|
|
netInt := binary.BigEndian.Uint32(networkIP)
|
|
bcastInt := binary.BigEndian.Uint32(broadcastIP)
|
|
total := int(bcastInt - netInt + 1)
|
|
if total > 2 {
|
|
hosts = total - 2 // excluir network y broadcast
|
|
} else {
|
|
hosts = total // /31 o /32
|
|
}
|
|
|
|
return network, broadcast, hosts, nil
|
|
}
|