// Package bufferover is a bufferover Scraping Engine in Golang
package bufferover
import (
"context"
"fmt"
"strings"
jsoniter "github.com/json-iterator/go"
"github.com/projectdiscovery/subfinder/v2/pkg/subscraping"
)
type response struct {
Meta struct {
Errors []string `json:"Errors"`
} `json:"Meta"`
FDNSA []string `json:"FDNS_A"`
RDNS []string `json:"RDNS"`
Results []string `json:"Results"`
}
// Source is the passive scraping agent
type Source struct{}
// 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() {
// Run enumeration on subdomain dataset for historical SONAR datasets
s.getData(ctx, fmt.Sprintf("https://dns.bufferover.run/dns?q=.%s", domain), session, results)
s.getData(ctx, fmt.Sprintf("https://tls.bufferover.run/dns?q=.%s", domain), session, results)
close(results)
}()
return results
}
func (s *Source) getData(ctx context.Context, sourceURL string, session *subscraping.Session, results chan subscraping.Result) {
resp, err := session.SimpleGet(ctx, sourceURL)
if err != nil && resp == nil {
results <- subscraping.Result{Source: s.Name(), Type: subscraping.Error, Error: err}
session.DiscardHTTPResponse(resp)
return
}
var bufforesponse response
err = jsoniter.NewDecoder(resp.Body).Decode(&bufforesponse)
if err != nil {
results <- subscraping.Result{Source: s.Name(), Type: subscraping.Error, Error: err}
resp.Body.Close()
return
}
resp.Body.Close()
metaErrors := bufforesponse.Meta.Errors
if len(metaErrors) > 0 {
results <- subscraping.Result{Source: s.Name(), Type: subscraping.Error, Error: fmt.Errorf("%s", strings.Join(metaErrors, ", "))}
return
}
var subdomains []string
if len(bufforesponse.FDNSA) > 0 {
subdomains = bufforesponse.FDNSA
subdomains = append(subdomains, bufforesponse.RDNS...)
} else if len(bufforesponse.Results) > 0 {
subdomains = bufforesponse.Results
}
for _, subdomain := range subdomains {
for _, value := range session.Extractor.FindAllString(subdomain, -1) {
results <- subscraping.Result{Source: s.Name(), Type: subscraping.Subdomain, Value: value}
}
}
}
// Name returns the name of the source
func (s *Source) Name() string {
return "bufferover"
}