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dcrawl.go
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package main
import (
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"net"
"strings"
"regexp"
"flag"
"os"
"bufio"
"time"
"golang.org/x/net/publicsuffix"
)
const Version = "1.0"
const BodyLimit = 1024*1024
const MaxQueuedUrls = 4096
const MaxVisitedUrls = 8192
const UserAgent = "dcrawl/1.0"
var http_client *http.Client
var (
start_url = flag.String("url", "", "URL to start scraping from")
output_file = flag.String("out", "", "output file to save hostnames to")
max_threads = flag.Int("t", 8, "number of concurrent threads (def. 8)")
max_urls_per_domain = flag.Int("mu", 5, "maximum number of links to spider per hostname (def. 5)")
max_subdomains = flag.Int("ms", 10, "maximum different subdomains for one domain (def. 10)")
verbose = flag.Bool("v", false, "verbose (def. false)")
)
type ParsedUrl struct {
u string
urls []string
}
func stringInArray(s string, sa []string) (bool) {
for _, x := range sa {
if x == s {
return true
}
}
return false
}
func get_html(u string) ([]byte, error) {
req, err := http.NewRequest("HEAD", u, nil)
if err != nil {
return nil, err
}
req.Header.Set("User-Agent", UserAgent)
resp, err := http_client.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("HTTP response %d", resp.StatusCode)
}
if _, ct_ok := resp.Header["Content-Type"]; ct_ok {
ctypes := strings.Split(resp.Header["Content-Type"][0], ";")
if !stringInArray("text/html", ctypes) {
return nil, fmt.Errorf("URL is not 'text/html'")
}
}
req.Method = "GET"
resp, err = http_client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
b, err := ioutil.ReadAll(io.LimitReader(resp.Body, BodyLimit)) // limit response reading to 1MB
if err != nil {
return nil, err
}
return b, nil
}
func find_all_urls(u string, b []byte) ([]string) {
r, _ := regexp.Compile(`<a\s+(?:[^>]*?\s+)?href=["\']([^"\']*)`)
urls := r.FindAllSubmatch(b,-1)
var rurls []string
ru, _ := regexp.Compile(`^(?:ftp|http|https):\/\/(?:[\w\.\-\+]+:{0,1}[\w\.\-\+]*@)?(?:[a-z0-9\-\.]+)(?::[0-9]+)?(?:\/|\/(?:[\w#!:\.\?\+=&%@!\-\/\(\)]+)|\?(?:[\w#!:\.\?\+=&%@!\-\/\(\)]+))?$`)
for _, ua := range urls {
if ru.Match(ua[1]) {
rurls = append(rurls, string(ua[1]))
} else if len(ua)>0 && len(ua[1])>0 && ua[1][0] == '/' {
up, err := url.Parse(u)
if err == nil {
ur := up.Scheme + "://" + up.Host + string(ua[1])
if ru.MatchString(ur) {
rurls = append(rurls, ur)
}
}
}
}
return rurls
}
func grab_site_urls(u string) ([]string, error) {
var ret []string
b, err := get_html(u)
if err == nil {
ret = find_all_urls(u, b)
}
return ret, err
}
func process_urls(in <-chan string, out chan<- ParsedUrl) {
for {
var u string = <-in
if *verbose {
fmt.Printf("[->] %s\n", u)
}
urls, err := grab_site_urls(u)
if err != nil {
u = ""
}
out <- ParsedUrl{u, urls}
}
}
func is_blacklisted(u string) (bool) {
var blhosts []string = []string{
"google.com", ".google.", "facebook.com", "twitter.com", ".gov", "youtube.com", "wikipedia.org", "wikisource.org", "wikibooks.org", "deviantart.com",
"wiktionary.org", "wikiquote.org", "wikiversity.org", "wikia.com", "deviantart.com", "blogspot.", "wordpress.com", "tumblr.com", "about.com",
}
for _, bl := range blhosts {
if strings.Contains(u, bl) {
return true
}
}
return false
}
func create_http_client() *http.Client {
var transport = &http.Transport{
Dial: (&net.Dialer{
Timeout: 10 * time.Second,
}).Dial,
TLSHandshakeTimeout: 5 * time.Second,
DisableKeepAlives: true,
}
client := &http.Client{
Timeout: time.Second * 10,
Transport: transport,
}
return client
}
func banner() {
fmt.Println(` ___ __ `)
fmt.Println(` __| _/________________ __ _ _| | `)
fmt.Println(` / __ |/ ___\_ __ \__ \\ \/ \/ / | `)
fmt.Println(`/ /_/ \ \___| | \// __ \\ /| |__`)
fmt.Println(`\____ |\___ >__| (____ /\/\_/ |____/`)
fmt.Println(` \/ \/ \/ v.` + Version)
fmt.Println("")
}
func usage() {
fmt.Printf("usage: dcrawl -url URL -out OUTPUT_FILE\n\n")
}
func init() {
http_client = create_http_client()
}
func main() {
banner()
flag.Parse()
if *start_url == "" || *output_file == "" {
usage()
return
}
fmt.Printf("[*] output file: %s\n", *output_file)
fmt.Printf("[*] start URL: %s\n", *start_url)
fmt.Printf("[*] max threads: %d\n", *max_threads)
fmt.Printf("[*] max links: %d\n", *max_urls_per_domain)
fmt.Printf("[*] max subd: %d\n", *max_subdomains)
fmt.Printf("\n")
vurls := make(map[string]bool)
chosts := make(map[string]int)
dhosts := make(map[string]bool)
ldhosts := make(map[string]int)
var qurls []string
var thosts []string
fo, err := os.OpenFile(*output_file, os.O_APPEND, 0666)
if os.IsNotExist(err) {
fo, err = os.Create(*output_file)
}
if err != nil {
fmt.Fprintf(os.Stderr, "ERROR: can't open or create file '%s'", *output_file)
return
}
defer fo.Close()
scanner := bufio.NewScanner(fo)
nd := 0
for scanner.Scan() {
hn := scanner.Text()
if hd, err := publicsuffix.EffectiveTLDPlusOne(hn); err == nil {
ldhosts[hd] += 1
}
dhosts[hn] = true
thosts = append(thosts, hn)
nd++
}
fmt.Printf("[+] loaded %d domains\n\n", nd)
w := bufio.NewWriter(fo)
su := *start_url
in_url := make(chan string)
out_urls := make(chan ParsedUrl)
for x := 0; x < *max_threads; x++ {
go process_urls(in_url, out_urls)
}
tu := 1
ups, err := url.Parse(su)
if err != nil {
fmt.Fprintf(os.Stderr, "[-] ERROR: invalid start URL: %s\n", su)
return
}
if _, sd_ok := dhosts[ups.Host]; sd_ok {
fmt.Printf("[*] start URL detected in saved domains\n")
fmt.Printf("[*] using last %d saved domains for crawling\n", *max_threads)
for _, d := range thosts[len(thosts)-*max_threads:] {
fmt.Printf("[+] adding: %s\n", ("http://" + d))
qurls = append(qurls, ("http://" + d))
}
in_url <- qurls[0]
} else {
in_url <- su
}
for {
var purl ParsedUrl = <-out_urls
tu -= 1
if purl.u != "" {
if du, err := url.Parse(purl.u); err == nil {
if _, d_ok := dhosts[du.Host]; !d_ok {
fmt.Printf("[%d] %s\n", len(dhosts), du.Host)
dhosts[du.Host] = true
fmt.Fprintf(w, "%s\n", du.Host)
w.Flush()
}
}
urls := purl.urls
for _, u := range urls {
// strip # out of url if exists
u = strings.Split(u,"#")[0]
up, err := url.Parse(u)
if err == nil {
h := up.Host
hd := ""
d_ok := true
if hd, err = publicsuffix.EffectiveTLDPlusOne(h); err == nil {
if n, ok := ldhosts[hd]; ok {
if n >= *max_subdomains {
d_ok = false
}
}
}
_, is_v := vurls[u]
if !is_blacklisted(u) && chosts[h] < *max_urls_per_domain && !is_v && d_ok && len(qurls) < MaxQueuedUrls {
vurls[u] = true
chosts[h] += 1
if hd != "" {
ldhosts[hd] += 1
}
qurls = append(qurls, u)
}
}
}
}
if len(qurls) == 0 {
fmt.Fprintf(os.Stderr, "ERROR: ran out of queued urls!\n")
return
}
// push more urls to channel
for tu < *max_threads && len(qurls) > 0 {
u := qurls[0]
qurls = append(qurls[:0], qurls[1:]...)
in_url <- u
tu++
}
if len(vurls) >= MaxVisitedUrls {
vurls = make(map[string]bool)
}
}
}