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scanner.go
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scanner.go
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package main
import (
"fmt"
"net"
"strconv"
"sync"
"time"
)
type item struct {
IP string
Port int
Proto string
}
func (i item) Addr() string {
return i.IP + ":" + strconv.Itoa(i.Port)
}
func (i item) IsOpen() bool {
if i.Proto == "udp" {
return isOpenUDP(i.Addr())
}
return isOpen(i.Addr())
}
func isOpen(addr string) bool {
conn, err := net.DialTimeout("tcp", addr, time.Second*1)
if err != nil {
return false
}
conn.Close()
return true
}
func isOpenUDP(addr string) bool {
udpaddr, err := net.ResolveUDPAddr("udp4", addr)
if err != nil {
return false
}
conn, err := net.DialUDP("udp", nil, udpaddr)
if err != nil {
return false
}
defer conn.Close()
conn.SetDeadline(time.Now().Add(time.Duration(time.Second * 1)))
var data []byte
switch udpaddr.Port {
case 53:
data = []byte("\x24\x1a\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x03\x77\x77\x77\x06\x67\x6f\x6f\x67\x6c\x65\x03\x63\x6f\x6d\x00\x00\x01\x00\x01")
case 123:
data = []byte("\xe3\x00\x04\xfa\x00\x01\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xc5\x4f\x23\x4b\x71\xb1\x52\xf3")
case 161:
data = []byte("\x30\x2c\x02\x01\x00\x04\x07\x70\x75\x62\x6c\x69\x63\xA0\x1E\x02\x01\x01\x02\x01\x00\x02\x01\x00\x30\x13\x30\x11\x06\x0D\x2B\x06\x01\x04\x01\x94\x78\x01\x02\x07\x03\x02\x00\x05\x00")
default:
data = []byte("\xff\xff\x70\x69\x65\x73\x63\x61\x6e\x6e\x65\x72\x20\x2d\x20\x40\x5f\x78\x39\x30\x5f\x5f")
}
_, err = conn.Write(data)
if err != nil {
return false
}
buf := make([]byte, 256)
_, err = conn.Read(buf)
return err == nil
}
func scan(tasks <-chan item, done chan<- int) {
var wg sync.WaitGroup
limiter := make(chan struct{}, maxThread)
result := make(chan string, 1024)
go func() {
for s := range result {
fmt.Println(s)
}
}()
for i := range tasks {
wg.Add(1)
limiter <- struct{}{}
go func(i item) {
defer wg.Done()
if i.IsOpen() {
result <- fmt.Sprintf("%22s [%s] is open", i.Addr(), i.Proto)
}
<-limiter
}(i)
}
wg.Wait()
close(result)
done <- 1
}
func addFullScan(tasks chan<- item, ip string) {
for i := 1; i < 65536; i++ {
tasks <- item{IP: ip, Port: i, Proto: "tcp"}
//tasks <- item{IP: ip, Port: i, Proto: "udp"}
}
}
func addQuickScan(tasks chan<- item, ip string) {
commonPorts := []int{
21, 22, 23, 25, 53, 80, 81,
110, 135, 137, 138, 139, 389, 443, 465, 587,
1433, 1434, 1521, 3306, 3389, 3899, 4899,
5000, 5432, 5631, 5632, 5900, 6379, 7001, 8000, 8080, 8888,
8081, 8443, 9090, 9200, 9300, 10050, 10051, 11211, 27017}
for _, p := range commonPorts {
tasks <- item{IP: ip, Port: p, Proto: "tcp"}
}
tasks <- item{IP: ip, Port: 53, Proto: "udp"}
}
func addSpecifiedScan(tasks chan<- item, ip, port string) {
if p, err := strconv.Atoi(port); err == nil {
tasks <- item{IP: ip, Port: p, Proto: "tcp"}
tasks <- item{IP: ip, Port: p, Proto: "udp"}
}
}
func genTask(tasks chan item, ips []string) {
for _, ip := range ips {
if specifiedPort != "" {
addSpecifiedScan(tasks, ip, specifiedPort)
} else if fullMode {
addFullScan(tasks, ip)
} else {
addQuickScan(tasks, ip)
}
}
close(tasks)
}