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masscan.go
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masscan.go
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package masscan
import (
"bufio"
"bytes"
"context"
"fmt"
"os/exec"
"strings"
)
type MasscanRunner interface {
Run() (result *MasscaRun, warnning []string, err error)
}
type MasscanScanner struct {
cmd *exec.Cmd
args []string
masscanPath string
cxt context.Context
stderr, stdout bufio.Scanner
}
type Options func(*MasscanScanner)
func NewMasscanScanner(options ...Options) (*MasscanScanner, error) {
masscanScanner := &MasscanScanner{}
for _, option := range options {
option(masscanScanner)
}
if masscanScanner.masscanPath == "" {
var err error
masscanScanner.masscanPath, err = exec.LookPath("masscan")
if err != nil {
return nil, MasscanNotInstalledError
}
}
if masscanScanner.cxt == nil {
masscanScanner.cxt = context.Background()
}
return masscanScanner, nil
}
func (m *MasscanScanner) Run() (result *MasscaRun, warnning []string, err error) {
var (
stdout, stderr bytes.Buffer
resume bool
)
args := m.args
for _, arg := range args {
if arg == "--resume" {
resume = true
break
}
}
if !resume {
args = append(args, "-oX")
args = append(args, "-")
}
cmd := exec.Command(m.masscanPath, args...)
cmd.Stdout = &stdout
cmd.Stderr = &stderr
err = cmd.Start()
if err != nil {
return nil, warnning, err
}
done := make(chan error, 1)
go func() {
done <- cmd.Wait()
}()
select {
case <-m.cxt.Done():
_ = cmd.Process.Kill()
return nil, warnning, MasscanScanTimeoutError
case <-done:
if stderr.Len() > 0 {
warnning = strings.Split(strings.Trim(stderr.String(), "\n"), "\n")
}
result, err := ParseXML(stdout.Bytes())
if err != nil {
warnning = append(warnning, err.Error())
return nil, warnning, MasscaScanResultParseError
}
return result, warnning, nil
}
}
func (m *MasscanScanner) RunAsync() error {
args := m.args
args = append(args, "-oX")
args = append(args, "-")
m.cmd = exec.Command(m.masscanPath, args...)
stderr, err := m.cmd.StderrPipe()
if err != nil {
return fmt.Errorf("unable to get error output from asynchronous masscan run: %v", err)
}
stdout, err := m.cmd.StdoutPipe()
if err != nil {
return fmt.Errorf("unable to get standard output from asynchronous masscan run: %v", err)
}
m.stdout = *bufio.NewScanner(stdout)
m.stderr = *bufio.NewScanner(stderr)
if err := m.cmd.Start(); err != nil {
return fmt.Errorf("unable to execute asynchronous masscan run: %v", err)
}
go func() {
<-m.cxt.Done()
_ = m.cmd.Process.Kill()
}()
return nil
}
func (m *MasscanScanner) Start() error {
return m.cmd.Wait()
}
func (m *MasscanScanner) GetStdout() bufio.Scanner {
return m.stdout
}
func (m *MasscanScanner) GetStderr() bufio.Scanner {
return m.stderr
}
func WithMasscanBinaryPath(binPath string) Options {
return func(m *MasscanScanner) {
m.masscanPath = binPath
}
}
func WithCustomArguments(args ...string) Options {
return func(m *MasscanScanner) {
m.args = append(m.args, args...)
}
}
// anything on the command-line not prefixed with a '-' is assumed to be an IP address or range.
// There are three valid formats. The first is a single IPv4 address like "192.168.0.1".
// The second is a range like "10.0.0.1-10.0.0.100".
// The third is a CIDR address, like "0.0.0.0/0".
// At least one target must be specified. Multiple targets can be specified.
// This can be specified as multiple options separated by space,
// or can be separated by a comma as a single option, such as 10.0.0.0/8,192.168.0.1.
func WithTargets(targets ...string) Options {
return func(m *MasscanScanner) {
m.args = append(m.args, targets...)
}
}
// specifies the port(s) to be scanned.
func WithPorts(ports ...string) Options {
portList := strings.Join(ports, ",")
return func(m *MasscanScanner) {
var flags int = -1
for p, value := range m.args {
if value == "-p" {
flags = p
break
}
}
if flags >= 0 {
portList = m.args[flags+1] + "," + portList
m.args[flags+1] = portList
} else {
m.args = append(m.args, "-p")
m.args = append(m.args, portList)
}
}
}
/*
Scan only UDP segments
example:
func main() {
...
masscan.WithUdpPorts(":9000,99999")
...
// or
masscan.WithUdpPorts(":22-11211")
}
*/
func WithUdpPorts(ports string) Options {
return func(m *MasscanScanner) {
m.args = append(m.args, fmt.Sprintf("-p U%s", ports))
}
}
// specifies that banners should be grabbed, like HTTP server versions, HTML title fields, and so forth.
// Only a few protocols are supported.
func WithBanners() Options {
return func(m *MasscanScanner) {
m.args = append(m.args, "--banners")
}
}
// specifies the desired rate for transmitting packets.
func WithRate(rate int) Options {
return func(m *MasscanScanner) {
m.args = append(m.args, "--rate")
m.args = append(m.args, fmt.Sprint(rate))
}
}
// indicates that the scan should include an ICMP echo request.
func WithPingScan() Options {
return func(m *MasscanScanner) {
m.args = append(m.args, "--ping")
}
}
// specifies the TTL of outgoing packets, defaults to 255.
func WithTTL(number int16) Options {
return func(m *MasscanScanner) {
if number < 0 || number > 255 {
panic("")
}
m.args = append(m.args, "--ttl")
m.args = append(m.args, fmt.Sprint(number))
}
}
func WithConnectionTimeout(second int) Options {
return func(m *MasscanScanner) {
m.args = append(m.args, "--connection-timeout")
m.args = append(m.args, fmt.Sprint(second))
}
}
func WithRetriesNumber(number int) Options {
return func(m *MasscanScanner) {
m.args = append(m.args, "--retries")
m.args = append(m.args, fmt.Sprint(number))
}
}
func WithTargetExclusion(target string) Options {
return func(m *MasscanScanner) {
m.args = append(m.args, "--exclude")
m.args = append(m.args, target)
}
}
func WithExclusionFile(fileName string) Options {
return func(m *MasscanScanner) {
m.args = append(m.args, "--excludefile")
m.args = append(m.args, fileName)
}
}
func WithTopPorts(ports int) Options {
return func(m *MasscanScanner) {
m.args = append(m.args, "‐‐top-ports")
m.args = append(m.args, fmt.Sprint(ports))
}
}
func WithTopTen() Options {
return func(m *MasscanScanner) {
m.args = append(m.args, "‐‐top-ten")
}
}
func WithResumePreviousScan(resumeFile string) Options {
return func(m *MasscanScanner) {
m.args = append(m.args, "--resume")
m.args = append(m.args, resumeFile)
}
}
func WithContext(cxt context.Context) Options {
return func(m *MasscanScanner) {
m.cxt = cxt
}
}
/*
send packets using this IP address.
If not specified, then the first IP address bound to the network interface will be used.
Instead of a single IP address, a range may be specified.
NOTE: The size of the range must be an even power of 2, such as 1, 2, 4, 8, 16, 1024 etc. addresses.
*/
func WithAdapterIP(address string) Options {
return func(m *MasscanScanner) {
m.args = append(m.args, "--adapter-ip")
m.args = append(m.args, address)
}
}
/*
send packets using this port number as the source.
If not specified, a random port will be chosen in the range 40000 through 60000.
This port should be filtered by the host firewall (like iptables) to prevent
the host network stack from interfering with arriving packets. Instead of a single port,
a range can be specified, like 40000-40003.
NOTE: The size of the range must be an even power of 2, such as the example above that has a total of 4 addresses.
*/
func WithAdapterPort(port int) Options {
return func(m *MasscanScanner) {
m.args = append(m.args, "--adapter-port")
m.args = append(m.args, fmt.Sprint(port))
}
}
/*
send packets using this as the source MAC address.
If not specified, then the first MAC address bound to the network interface will be used.
*/
func WithAdapterMAC(mac string) Options {
return func(m *MasscanScanner) {
m.args = append(m.args, "--adapter-mac")
m.args = append(m.args, mac)
}
}
/*
send packets to this MAC address as the destination.
If not specified, then the gateway address of the network interface will be ARPed.
*/
func WithRouterMAC(mac string) Options {
return func(m *MasscanScanner) {
m.args = append(m.args, "--router-mac")
m.args = append(m.args, mac)
}
}
/*
replaces the existing user-agent field with the indicated value when doing HTTP requests.
*/
func WithUserAgent(ua string) Options {
return func(m *MasscanScanner) {
m.args = append(m.args, "--http-user-agent")
m.args = append(m.args, ua)
}
}
/*
specifies the number of seconds after transmit is done to wait for receiving packets before exiting the program.
The default is 10 seconds. The string forever can be specified to never terminate.
*/
func WithWait(sec int) Options {
return func(m *MasscanScanner) {
m.args = append(m.args, "--wait")
m.args = append(m.args, fmt.Sprint(sec))
}
}