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hostscan.go
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hostscan.go
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package scanning
import (
"net"
"encoding/binary"
"time"
"github.com/go-ping/ping"
"fmt"
)
func Hostscan(ip_range string, ping_timeout int) ([]string, error) { // Scan an ip range and return active ips in less than 30s
var range_ips []string
var active_ips []string
_, ipv4Net, err := net.ParseCIDR(ip_range)
if err != nil {
return []string{""}, nil
}
mask := binary.BigEndian.Uint32(ipv4Net.Mask)
start := binary.BigEndian.Uint32(ipv4Net.IP)
finish := (start & mask) | (mask ^ 0xffffffff)
for i := start; i <= finish; i++ { // Generate ips slice
ip := make(net.IP, 4)
binary.BigEndian.PutUint32(ip, i)
range_ips = append(range_ips, ip.String())
}
// Iterate through ips to check
for _, ip_to_scan := range range_ips {
fmt.Println(ip_to_scan)
pinger, err := ping.NewPinger(ip_to_scan) // Send ping to all ips and check if packet is up
if err != nil {
return []string{""}, err
}
pinger.SetPrivileged(true)
pinger.Timeout = time.Duration(ping_timeout) * time.Millisecond
pinger.Count = 1 // just send one packet
pinger.OnFinish = func(stats *ping.Statistics) {
if stats.PacketsRecv == 1 {
active_ips = append(active_ips, ip_to_scan)
}
}
err = pinger.Run()
if err != nil {
return []string{""}, err
}
}
return active_ips, nil
}