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iputils.go
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/
iputils.go
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package iputils
import (
"crypto/rand"
"fmt"
"net/netip"
)
func AllocateIP(allocations map[string]string, cidrs ...string) (string, error) {
for _, cidr := range cidrs {
prefix, err := netip.ParsePrefix(cidr)
if err != nil {
return "", fmt.Errorf("Invalid CIDR: %s", cidr)
}
prefix = prefix.Masked()
for addr := prefix.Addr(); prefix.Contains(addr); addr = addr.Next() {
addrStr := addr.String()
if _, exists := allocations[addrStr]; !exists {
return addrStr, nil
}
}
}
return "", fmt.Errorf("No available IPs")
}
func GenerateRandomMAC() (string, error) {
MAC := make([]byte, 6, 6)
n, err := rand.Read(MAC)
if n != len(MAC) || err != nil {
return "", fmt.Errorf("Failed to generate MAC address: %s", err)
}
// MAC needs to be local and unicast, set correct bits
MAC[0] |= 0x02
MAC[0] &= 0xfe
MACStr := fmt.Sprintf("%02x:%02x:%02x:%02x:%02x:%02x", MAC[0], MAC[1], MAC[2], MAC[3], MAC[4], MAC[5])
return MACStr, nil
}