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main.go
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main.go
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package main
import (
"bufio"
"time"
"flag"
"fmt"
"os"
"path/filepath"
"regexp"
"runtime"
"strings"
"sync"
"github.com/domainr/whois"
"github.com/domainr/whoistest"
"github.com/zonedb/zonedb"
"golang.org/x/net/idna"
)
var (
v, quick bool
oneZone string
maxAge time.Duration
concurrency int
zones []string
prefixes []string
firstLabel = regexp.MustCompile(`^[^\.]+\.`)
_, _file, _, _ = runtime.Caller(0)
_dir = filepath.Dir(_file)
)
func init() {
flag.BoolVar(&v, "v", false, "verbose output (to stderr)")
flag.BoolVar(&quick, "quick", false, "Only query a shorter subset of zones")
flag.StringVar(&oneZone, "zone", "", "Only query a specific zone")
flag.IntVar(&concurrency, "concurrency", 32, "Set maximum number of concurrent requests")
flag.DurationVar(&maxAge, "maxage", (24 * time.Hour * 30), "Set max age of responses before re-fetching")
}
func main() {
flag.Parse()
if err := main1(); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
func main1() error {
var zones []string
switch {
case oneZone != "":
fmt.Fprintf(os.Stderr, "Querying single zone: %s\n", oneZone)
zones = []string{oneZone}
case quick:
zones = strings.Fields(`com net org co io nr kr jp de in`)
fmt.Fprintf(os.Stderr, "Quick mode enabled, operating on %d zones\n", len(zones))
default:
for _, z := range zonedb.Zones {
zones = append(zones, z.Domain)
}
}
prefixes, err := readLines("prefixes.txt")
if err != nil {
return err
}
domains := make(map[string]bool, len(zones)*len(prefixes))
for _, zone := range zones {
for _, prefix := range prefixes {
domain := prefix + "." + zone
domains[domain] = true
host, _, err := whois.Server(domain)
if err == nil {
parent := firstLabel.ReplaceAllLiteralString(host, "")
if _, ok := domains[parent]; !ok && parent != "" {
fmt.Fprintf(os.Stderr, " + %s\n", parent)
domains[parent] = true
}
}
}
}
fmt.Fprintf(os.Stderr, "Querying whois for %d domains (%d prefixes × %d zones + extras)\n", len(domains), len(prefixes), len(zones))
responses := make(chan *whois.Response)
var limiter = make(chan struct{}, concurrency)
var hostLimiters = make(map[string](chan struct{}))
m := &sync.RWMutex{}
for domain, _ := range domains {
go func(domain string) {
req, err := whois.NewRequest(domain)
if err != nil {
return
}
// Only re-fetch responses > 1 month old
res, err := whois.ReadMIMEFile(whoistest.ResponseFilename(req.Query, req.Host))
if err == nil && time.Since(res.FetchedAt) < maxAge {
if v {
fmt.Fprintf(os.Stderr, "Skipping %s from %s\n", req.Query, req.Host)
}
responses <- nil
return
}
// Per-host semaphore to limit concurrency
m.RLock()
hostLimiter, ok := hostLimiters[req.Host]
m.RUnlock()
if !ok {
m.Lock()
hostLimiters[req.Host] = make(chan struct{}, 1)
hostLimiter = hostLimiters[req.Host]
m.Unlock()
}
// Acquire
hostLimiter <- struct{}{}
limiter <- struct{}{}
// Release
defer func() {
responses <- res
<-hostLimiter
<-limiter
}()
if v {
fmt.Fprintf(os.Stderr, "Fetching %s from %s\n", req.Query, req.Host)
}
res, err = whois.DefaultClient.Fetch(req)
if err != nil {
fmt.Fprintf(os.Stderr, "Error fetching whois for %s: %s\n", req.Query, err)
return
}
}(domain)
}
// Collect from goroutines
var wg sync.WaitGroup
wg.Add(len(domains))
for i := 0; i < len(domains); i++ {
go func() {
res := <-responses
defer wg.Done()
if res == nil {
return
}
if res.Host == "" {
fmt.Fprintf(os.Stderr, "Response for %q had no host\n", res.Query)
return
}
if len(res.Body) == 0 {
fmt.Fprintf(os.Stderr, "Response for %q had empty body\n", res.Query)
return
}
fn := whoistest.ResponseFilename(res.Query, res.Host)
dir := filepath.Dir(fn)
err := os.MkdirAll(dir, os.ModePerm)
if err != nil {
fmt.Fprintf(os.Stderr, "Error creating response directory for %s: %s\n", res.Host, err)
return
}
f, err := os.Create(fn)
if err != nil {
fmt.Fprintf(os.Stderr, "Error creating response file for %s: %s\n", res.Query, err)
return
}
defer f.Close()
res.WriteMIME(f)
}()
}
wg.Wait()
return nil
}
var whitespaceAndComments = regexp.MustCompile(`\s+|#.+$`)
func readLines(fn string) ([]string, error) {
fmt.Fprintf(os.Stderr, "Reading %s\n", fn)
f, err := os.Open(filepath.Join(_dir, "..", "..", "testdata", fn))
if err != nil {
return nil, err
}
defer f.Close()
var out []string
s := bufio.NewScanner(f)
for s.Scan() {
line := whitespaceAndComments.ReplaceAllLiteralString(s.Text(), "")
if line == "" {
continue
}
if line, ierr := idna.ToASCII(line); ierr == nil {
out = append(out, line)
}
}
return out, s.Err()
}