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// Package main provides onion-grab, a tool that visits a list of domains
// concurrently over HTTPS to see if they have Onion-Location configured.
//
// Install:
//
// $ go install git.cs.kau.se/rasmoste/onion-grab@latest
//
// Usage:
//
// $ onion-grab -h
package main
import (
"bufio"
"context"
"fmt"
"log"
"net/http"
"os"
"os/signal"
"sync"
"syscall"
"time"
"git.cs.kau.se/rasmoste/onion-grab/internal/onionloc"
"git.cs.kau.se/rasmoste/onion-grab/internal/options"
"git.cs.kau.se/rasmoste/onion-grab/internal/qna"
)
func main() {
opts := options.Parse()
cli := &http.Client{
Transport: &http.Transport{
DisableKeepAlives: true,
MaxResponseHeaderBytes: opts.MaxResponse * 1024 * 1024,
},
}
fp, err := os.OpenFile(opts.InputFile, os.O_RDONLY, 0644)
if err != nil {
log.Printf("ERROR: %v", err)
os.Exit(1)
}
defer fp.Close()
questionCh := make(chan qna.Question)
defer close(questionCh)
answerCh := make(chan qna.Answer)
defer close(answerCh)
var wg sync.WaitGroup
defer wg.Wait()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
log.Printf("INFO: starting await handler, ctrl+C to exit\n")
go func() {
wg.Add(1)
defer wg.Done()
await(ctx, cancel)
}()
log.Printf("INFO: starting %d workers\n", opts.NumWorkers)
for i := 0; i < opts.NumWorkers; i++ {
go func() {
wg.Add(1)
defer wg.Done()
workHandler(ctx, opts, cli, questionCh, answerCh)
}()
}
log.Printf("INFO: starting work aggregator\n")
go func() {
wg.Add(1)
defer wg.Done()
workAggregator(ctx, opts, answerCh)
}()
log.Printf("INFO: generating work\n")
nextLine, readAll := workGenerator(ctx, opts, fp, questionCh)
if !readAll {
warn := fmt.Sprintf("only read up until line %d", nextLine)
if opts.NextLine != 0 {
warn += fmt.Sprintf(" (line %d relative to start)", nextLine-opts.NextLine)
}
log.Printf("WARNING: %s\n", warn)
}
}
func await(ctx context.Context, cancel context.CancelFunc) {
sigs := make(chan os.Signal, 1)
defer close(sigs)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
select {
case <-sigs:
case <-ctx.Done():
}
cancel()
}
func workHandler(ctx context.Context, opts options.Options, cli *http.Client, questionCh chan qna.Question, answerCh chan qna.Answer) {
for {
select {
case <-ctx.Done():
return
case question := <-questionCh:
func() {
cctx, cancel := context.WithTimeout(ctx, opts.Timeout)
defer cancel()
req, err := http.NewRequestWithContext(cctx, http.MethodGet, "https://"+question.Domain, nil)
if err != nil {
return
}
answer := qna.Answer{Domain: question.Domain}
rsp, err := cli.Do(req)
if err != nil {
answerCh <- answer
return
}
defer rsp.Body.Close()
answer.OK = true
onion, ok := onionloc.HTTP(rsp)
if ok {
answer.HTTP = onion
}
onion, ok = onionloc.HTML(rsp)
if ok {
answer.HTML = onion
}
answerCh <- answer
}()
}
}
}
func workAggregator(ctx context.Context, opts options.Options, answerCh chan qna.Answer) {
numConnect := 0
numOnions := 0
numAll := 0
output := func() {
log.Printf("INFO: %d/%d connected, %d sites configured Onion-Location\n", numConnect, numAll, numOnions)
}
handleAnswer := func(a qna.Answer) {
numAll += 1
if !a.OK {
return
}
numConnect += 1
if a.HTTP != "" || a.HTML != "" {
numOnions += 1
fmt.Printf("%s header=%s attribute=%s\n", a.Domain, a.HTTP, a.HTML)
}
}
ticker := time.NewTicker(opts.MetricsInterval)
defer ticker.Stop()
defer output()
for {
select {
case <-ctx.Done():
log.Printf("INFO: about to exit, reading remaining answers\n")
for {
select {
case a := <-answerCh:
handleAnswer(a)
case <-time.After(opts.Timeout):
return
}
}
case a := <-answerCh:
handleAnswer(a)
case <-ticker.C:
output()
}
}
}
func workGenerator(ctx context.Context, opts options.Options, fp *os.File, questionCh chan qna.Question) (int64, bool) {
scanner := bufio.NewScanner(fp)
buf := make([]byte, 0, opts.MaxFileBuffer*1024*1024)
scanner.Buffer(buf, opts.MaxFileBuffer*1024*1024)
nextLine := int64(0)
for scanner.Scan() {
select {
case <-ctx.Done():
return nextLine, false
default:
}
if nextLine == opts.NextLine {
break
}
scanner.Text()
nextLine++
}
for scanner.Scan() {
select {
case <-ctx.Done():
return nextLine, false
case questionCh <- qna.Question{Domain: scanner.Text()}:
nextLine++
}
}
select {
case <-ctx.Done():
case <-time.After(opts.Timeout):
}
return nextLine, true
}
|
