fix: prevent response file overwrite when -sd flag is used

runner/runner.go

@@ -477,15 +477,23 @@ func (r *Runner) prepareInputPaths() {
 	}
 }
 
+var duplicateTargetErr = errors.New("duplicate target")
+
 func (r *Runner) prepareInput() {
 	var numHosts int
 	// check if input target host(s) have been provided
 	if len(r.options.InputTargetHost) > 0 {
 		for _, target := range r.options.InputTargetHost {
-			expandedTarget, _ := r.countTargetFromRawTarget(target)
-			if expandedTarget > 0 {
+			expandedTarget, err := r.countTargetFromRawTarget(target)
+			if err == nil && expandedTarget > 0 {
 				numHosts += expandedTarget
-				r.hm.Set(target, nil) //nolint
+				r.hm.Set(target, []byte("1")) //nolint
+			} else if r.options.SkipDedupe && errors.Is(err, duplicateTargetErr) {
+				if v, ok := r.hm.Get(target); ok {
+					cnt, _ := strconv.Atoi(string(v))
+					_ = r.hm.Set(target, []byte(strconv.Itoa(cnt+1)))
+					numHosts += 1
+				}
 			}
 		}
 	}
@@ -643,10 +651,16 @@ func (r *Runner) loadAndCloseFile(finput *os.File) (numTargets int, err error) {
 	for scanner.Scan() {
 		target := strings.TrimSpace(scanner.Text())
 		// Used just to get the exact number of targets
-		expandedTarget, _ := r.countTargetFromRawTarget(target)
-		if expandedTarget > 0 {
+		expandedTarget, err := r.countTargetFromRawTarget(target)
+		if err == nil && expandedTarget > 0 {
 			numTargets += expandedTarget
-			r.hm.Set(target, nil) //nolint
+			r.hm.Set(target, []byte("1")) //nolint
+		} else if r.options.SkipDedupe && errors.Is(err, duplicateTargetErr) {
+			if v, ok := r.hm.Get(target); ok {
+				cnt, _ := strconv.Atoi(string(v))
+				_ = r.hm.Set(target, []byte(strconv.Itoa(cnt+1)))
+				numTargets += 1
+			}
 		}
 	}
 	err = finput.Close()
@@ -657,8 +671,9 @@ func (r *Runner) countTargetFromRawTarget(rawTarget string) (numTargets int, err
 	if rawTarget == "" {
 		return 0, nil
 	}
+
 	if _, ok := r.hm.Get(rawTarget); ok {
-		return 0, nil
+		return 0, duplicateTargetErr
 	}
 
 	expandedTarget := 0
@@ -1298,14 +1313,28 @@ func (r *Runner) RunEnumeration() {
 			}
 		}
 
-		if len(r.options.requestURIs) > 0 {
-			for _, p := range r.options.requestURIs {
-				scanopts := r.scanopts.Clone()
-				scanopts.RequestURI = p
-				r.process(k, wg, r.hp, protocol, scanopts, output)
+		runProcess := func(times int) {
+			for i := 0; i < times; i++ {
+				if len(r.options.requestURIs) > 0 {
+					for _, p := range r.options.requestURIs {
+						scanopts := r.scanopts.Clone()
+						scanopts.RequestURI = p
+						r.process(k, wg, r.hp, protocol, scanopts, output)
+					}
+				} else {
+					r.process(k, wg, r.hp, protocol, &r.scanopts, output)
+				}
+			}
+		}
+
+		if r.options.Stream {
+			runProcess(1)
+		} else if v, ok := r.hm.Get(k); ok {
+			cnt, err := strconv.Atoi(string(v))
+			if err != nil || cnt <= 0 {
+				cnt = 1
 			}
-		} else {
-			r.process(k, wg, r.hp, protocol, &r.scanopts, output)
+			runProcess(cnt)
 		}
 
 		return nil
@@ -2203,9 +2232,29 @@ retry:
 		data = append(data, []byte("\n\n\n")...)
 		data = append(data, []byte(fullURL)...)
 		_ = fileutil.CreateFolder(responseBaseDir)
-		writeErr := os.WriteFile(responsePath, data, 0644)
-		if writeErr != nil {
-			gologger.Error().Msgf("Could not write response at path '%s', to disk: %s", responsePath, writeErr)
+
+		finalPath := responsePath
+		idx := 0
+		for {
+			targetPath := finalPath
+			if idx > 0 {
+				basePath := strings.TrimSuffix(responsePath, ".txt")
+				targetPath = fmt.Sprintf("%s_%d.txt", basePath, idx)
+			}
+			f, err := os.OpenFile(targetPath, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0644)
+			if err == nil {
+				_, writeErr := f.Write(data)
+				_ = f.Close()
+				if writeErr != nil {
+					gologger.Error().Msgf("Could not write to '%s': %s", targetPath, writeErr)
+				}
+				break
+			}
+			if !os.IsExist(err) {
+				gologger.Error().Msgf("Failed to create file '%s': %s", targetPath, err)
+				break
+			}
+			idx++
 		}
 	}
 

runner/runner_test.go

@@ -7,6 +7,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/pkg/errors"
 	_ "github.com/projectdiscovery/fdmax/autofdmax"
 	"github.com/projectdiscovery/httpx/common/httpx"
 	"github.com/projectdiscovery/mapcidr/asn"
@@ -124,7 +125,9 @@ func TestRunner_asn_targets(t *testing.T) {
 }
 
 func TestRunner_countTargetFromRawTarget(t *testing.T) {
-	options := &Options{}
+	options := &Options{
+		SkipDedupe: false,
+	}
 	r, err := New(options)
 	require.Nil(t, err, "could not create httpx runner")
 
@@ -139,7 +142,7 @@ func TestRunner_countTargetFromRawTarget(t *testing.T) {
 	err = r.hm.Set(input, nil)
 	require.Nil(t, err, "could not set value to hm")
 	got, err = r.countTargetFromRawTarget(input)
-	require.Nil(t, err, "could not count targets")
+	require.True(t, errors.Is(err, duplicateTargetErr), "expected duplicate target error")
 	require.Equal(t, expected, got, "got wrong output")
 
 	input = "173.0.84.0/24"