projectdiscovery · ehsandeep · Dec 21, 2021 · Nov 1, 2021 · Dec 21, 2021
diff --git a/v2/pkg/passive/sources.go b/v2/pkg/passive/sources.go
@@ -7,6 +7,7 @@ import (
 	"github.com/projectdiscovery/subfinder/v2/pkg/subscraping/sources/archiveis"
 	"github.com/projectdiscovery/subfinder/v2/pkg/subscraping/sources/binaryedge"
 	"github.com/projectdiscovery/subfinder/v2/pkg/subscraping/sources/bufferover"
+	"github.com/projectdiscovery/subfinder/v2/pkg/subscraping/sources/c99"
 	"github.com/projectdiscovery/subfinder/v2/pkg/subscraping/sources/censys"
 	"github.com/projectdiscovery/subfinder/v2/pkg/subscraping/sources/certspotter"
 	"github.com/projectdiscovery/subfinder/v2/pkg/subscraping/sources/chaos"
@@ -43,6 +44,7 @@ var DefaultSources = []string{
 	"alienvault",
 	"anubis",
 	"bufferover",
+	"c99",
 	"certspotter",
 	"censys",
 	"chaos",
@@ -87,6 +89,7 @@ var DefaultAllSources = []string{
 	"archiveis",
 	"binaryedge",
 	"bufferover",
+	"c99",
 	"censys",
 	"certspotter",
 	"chaos",
@@ -149,6 +152,8 @@ func (a *Agent) addSources(sources []string) {
 			a.sources[source] = &binaryedge.Source{}
 		case "bufferover":
 			a.sources[source] = &bufferover.Source{}
+		case "c99":
+			a.sources[source] = &c99.Source{}
 		case "censys":
 			a.sources[source] = &censys.Source{}
 		case "certspotter":

diff --git a/v2/pkg/runner/config.go b/v2/pkg/runner/config.go
@@ -30,6 +30,7 @@ type ConfigFile struct {
 	ExcludeSources []string `yaml:"exclude-sources,omitempty"`
 	// API keys for different sources
 	Binaryedge     []string `yaml:"binaryedge"`
+	C99            []string `yaml:"c99"`
 	Censys         []string `yaml:"censys"`
 	Certspotter    []string `yaml:"certspotter"`
 	Chaos          []string `yaml:"chaos"`
@@ -121,6 +122,9 @@ func (c *ConfigFile) GetKeys() subscraping.Keys {
 	if len(c.Binaryedge) > 0 {
 		keys.Binaryedge = c.Binaryedge[rand.Intn(len(c.Binaryedge))]
 	}
+	if len(c.C99) > 0 {
+		keys.C99 = c.C99[rand.Intn(len(c.C99))]
+	}
 
 	if len(c.Censys) > 0 {
 		censysKeys := c.Censys[rand.Intn(len(c.Censys))]

diff --git a/v2/pkg/subscraping/sources/c99/c99.go b/v2/pkg/subscraping/sources/c99/c99.go
@@ -0,0 +1,71 @@
+// Package c99 logic
+package c99
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	jsoniter "github.com/json-iterator/go"
+	"github.com/projectdiscovery/subfinder/v2/pkg/subscraping"
+)
+
+// Source is the passive scraping agent
+type Source struct{}
+
+type dnsdbLookupResponse struct {
+	Success    bool `json:"success"`
+	Subdomains []struct {
+		Subdomain  string `json:"subdomain"`
+		IP         string `json:"ip"`
+		Cloudflare bool   `json:"cloudflare"`
+	} `json:"subdomains"`
+	Error string `json:"error"`
+}
+
+// Run function returns all subdomains found with the service
+func (s *Source) Run(ctx context.Context, domain string, session *subscraping.Session) <-chan subscraping.Result {
+	results := make(chan subscraping.Result)
+
+	go func() {
+		defer close(results)
+
+		if session.Keys.C99 == "" {
+			return
+		}
+
+		searchURL := fmt.Sprintf("https://api.c99.nl/subdomainfinder?key=%s&domain=%s&json", session.Keys.C99, domain)
+		resp, err := session.SimpleGet(ctx, searchURL)
+		if err != nil {
+			session.DiscardHTTPResponse(resp)
+			return
+		}
+
+		defer resp.Body.Close()
+
+		var response dnsdbLookupResponse
+		err = jsoniter.NewDecoder(resp.Body).Decode(&response)
+		if err != nil {
+			results <- subscraping.Result{Source: s.Name(), Type: subscraping.Error, Error: err}
+			return
+		}
+
+		if response.Error != "" {
+			results <- subscraping.Result{Source: s.Name(), Type: subscraping.Error, Error: fmt.Errorf("%v", response.Error)}
+			return
+		}
+
+		for _, data := range response.Subdomains {
+			if !strings.HasPrefix(data.Subdomain, ".") {
+				results <- subscraping.Result{Source: s.Name(), Type: subscraping.Subdomain, Value: data.Subdomain}
+			}
+		}
+	}()
+
+	return results
+}
+
+// Name returns the name of the source
+func (s *Source) Name() string {
+	return "c99"
+}
diff --git a/v2/pkg/subscraping/types.go b/v2/pkg/subscraping/types.go
@@ -40,6 +40,7 @@ type Session struct {
 // Keys contains the current API Keys we have in store
 type Keys struct {
 	Binaryedge           string   `json:"binaryedge"`
+	C99                  string   `json:"c99"`
 	CensysToken          string   `json:"censysUsername"`
 	CensysSecret         string   `json:"censysPassword"`
 	Certspotter          string   `json:"certspotter"`