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shuffle.go
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shuffle.go
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package mapcidr
import (
"net"
"github.com/projectdiscovery/blackrock"
)
func ShuffleCidrsWithSeed(cidrs []*net.IPNet, seed int64) chan Item {
// Shrink and compact
cidrs, _ = CoalesceCIDRs(cidrs)
out := make(chan Item)
go func(out chan Item, cidrs []*net.IPNet) {
defer close(out)
targetsCount := int64(TotalIPSInCidrs(cidrs))
Range := targetsCount
br := blackrock.New(Range, seed)
for index := int64(0); index < Range; index++ {
ipIndex := br.Shuffle(index)
ip := PickIP(cidrs, ipIndex)
if ip == "" {
continue
}
out <- Item{IP: ip}
}
}(out, cidrs)
return out
}
func ShuffleCidrsWithPortsAndSeed(cidrs []*net.IPNet, ports []int, seed int64) chan Item {
// Shrink and compact
cidrs, _ = CoalesceCIDRs(cidrs)
out := make(chan Item)
go func(out chan Item, cidrs []*net.IPNet) {
defer close(out)
targetsCount := int64(TotalIPSInCidrs(cidrs))
portsCount := int64(len(ports))
Range := targetsCount * portsCount
br := blackrock.New(Range, seed)
for index := int64(0); index < Range; index++ {
xxx := br.Shuffle(index)
ipIndex := xxx / portsCount
portIndex := int(xxx % portsCount)
ip := PickIP(cidrs, ipIndex)
port := PickPort(ports, portIndex)
if ip == "" || port <= 0 {
continue
}
out <- Item{IP: ip, Port: port}
}
}(out, cidrs)
return out
}
func PickIP(cidrs []*net.IPNet, index int64) string {
for _, target := range cidrs {
subnetIpsCount := int64(AddressCountIpnet(target))
if index < subnetIpsCount {
return PickSubnetIP(target, index)
}
index -= subnetIpsCount
}
return ""
}
func PickSubnetIP(network *net.IPNet, index int64) string {
return Inet_ntoa(Inet_aton(network.IP) + index).String()
}
func PickPort(ports []int, index int) int {
return ports[index]
}
func CIDRsAsIPNET(cidrs []string) (ipnets []*net.IPNet) {
for _, cidr := range cidrs {
ipnets = append(ipnets, AsIPV4CIDR(cidr))
}
return
}