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whois.go
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whois.go
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package build
import (
"bufio"
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net"
"os"
"regexp"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/miekg/dns"
"github.com/wsxiaoys/terminal/color"
"golang.org/x/net/idna"
)
// QueryWhoisServers queries whois-servers.net for CNAME’d whois servers.
func QueryWhoisServers(zones map[string]*Zone) error {
color.Fprintf(os.Stderr, "@{.}Querying whois-servers.net for %d zones...\n", len(zones))
// Get name servers for whois-servers.net
rrs, err := resolver.LookupNS(context.Background(), "whois-servers.net")
if err != nil {
return err
}
if len(rrs) == 0 {
return errors.New("no name servers for whois-servers.net")
}
host := rrs[0].Host
// Iterate zones
var found int32
mapZones(zones, func(z *Zone) {
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
name := z.ASCII() + ".whois-servers.net."
rmsg, err := exchange(ctx, host, name, dns.TypeCNAME) // Single-depth CNAME query
if err != nil {
// color.Fprintf(os.Stderr, "@{r}Error querying %s: %s\n", name, err.Error())
return
}
for _, rr := range rmsg.Answer {
if cname, ok := rr.(*dns.CNAME); ok {
addr := cname.Target
// whois-servers.net occasionally returns whois.ripe.net (unusable)
if addr == "whois.ripe.net." {
return
}
if verifyWhois(addr) != nil {
return
}
z.WhoisServer = Normalize(addr)
atomic.AddInt32(&found, 1)
return
}
}
})
color.Fprintf(os.Stderr, "@{.}Found %d whois servers\n", found)
return nil
}
const rubyWhoisURL = "https://github.com/weppos/whois/raw/HEAD/data/tld.json"
// FetchRubyWhoisServers fetches whois servers from the Ruby Whois project.
func FetchRubyWhoisServers(zones map[string]*Zone, addNew bool) error {
res, err := Fetch(rubyWhoisURL)
if err != nil {
return err
}
defer res.Body.Close()
records := make(map[string]struct {
Host string `json:"host"`
Adapter string `json:"adapter"`
URL string `json:"url"`
})
d := json.NewDecoder(res.Body)
err = d.Decode(&records)
if err != nil {
return err
}
var servers, urls int
for d, rec := range records {
// Skip broken records
if d == "_" || d == "whois.nic.beauty" {
continue
}
// Skip empty records
if rec.Host == "" && rec.Adapter == "none" && rec.URL == "" {
continue
}
d = Normalize(d)
z := zones[d]
if z == nil {
if !addNew {
continue
}
color.Fprintf(os.Stderr, "@{g}New zone @{g!}%s@{g}\n", d)
z = &Zone{Domain: d}
zones[d] = z
}
if rec.Host != "" && rec.Host != z.WhoisServer {
err := verifyWhois(rec.Host)
if err == nil {
z.WhoisServer = Normalize(rec.Host)
servers++
}
}
if z.WhoisServer != "" && rec.URL != "" && rec.URL != z.WhoisURL {
z.WhoisURL = rec.URL
urls++
}
}
color.Fprintf(os.Stderr, "@{.}Set %d whois servers, %d URLs from Ruby Whois\n", servers, urls)
return nil
}
// QueryIANA fetches whois data from whois.iana.org.
func QueryIANA(zones map[string]*Zone) error {
tlds := TLDs(zones)
color.Fprintf(os.Stderr, "@{.}Querying whois.iana.org for %d TLDs...\n", len(tlds))
limiter := make(chan struct{}, Concurrency)
var wg sync.WaitGroup
for _, z := range tlds {
limiter <- struct{}{}
wg.Add(1)
go func(z *Zone) {
defer func() {
<-limiter
wg.Done()
}()
err := tldWhois(z)
if err != nil {
LogWarning(err)
}
}(z)
}
wg.Wait()
return nil
}
var (
whoisLine = regexp.MustCompile(`^([^:]+)\:\s+(.+)$`)
nserverValue = regexp.MustCompile(`^(\S+)`)
)
func tldWhois(z *Zone) error {
b, err := queryWhois("whois.iana.org", z.ASCII())
if err != nil {
return err
}
s := bufio.NewScanner(bytes.NewBuffer(b))
for s.Scan() {
m := whoisLine.FindStringSubmatch(s.Text())
if m == nil {
continue
}
k, v := strings.ToLower(m[1]), m[2]
switch k {
case "domain":
d := Normalize(v)
if d != z.Domain {
return fmt.Errorf("IANA whois returned %s, expected %s", d, z.Domain)
}
case "nserver":
vm := nserverValue.FindStringSubmatch(v)
if vm == nil {
break
}
z.NameServers = append(z.NameServers, Normalize(vm[1]))
case "whois":
if verifyWhois(v) != nil {
break
}
z.WhoisServer = Normalize(v)
}
}
if err = s.Err(); err != nil {
return err
}
return nil
}
func queryWhois(addr, query string) ([]byte, error) {
if !strings.Contains(addr, ":") {
addr = addr + ":43"
}
c, err := net.Dial("tcp", addr)
if err != nil {
return nil, err
}
defer c.Close()
if _, err = fmt.Fprint(c, query, "\r\n"); err != nil {
return nil, err
}
res, err := ioutil.ReadAll(c)
if err != nil {
return nil, err
}
return res, nil
}
// VerifyWhois verifies that the whois servers respond on TCP port 43.
func VerifyWhois(zones map[string]*Zone) {
color.Fprintf(os.Stderr, "@{.}Verifying whois servers for %d zones...\n", len(zones))
mapZones(zones, func(z *Zone) {
if z.WhoisServer != "" {
if err := verifyWhois(z.WhoisServer); err != nil {
LogWarning(fmt.Errorf("can’t verify whois server %s: %s", z.WhoisServer, err))
z.WhoisServer = ""
}
}
})
}
func verifyWhois(host string) error {
host, err := idna.ToASCII(Normalize(host))
if err != nil {
return err
}
err = CanDial("tcp", host+":43")
return err
}