hax01tips
注意：本文之后極有可能設為私有
題目
hax01
Your mission is the following: Simply enter a URL into the box. The domain of the URL must be or end with 'nasa.gov'. The URL will be fetched right away. The content returned should contain the string: "2200178118" in the first 10 Kbytes of data. 404/403/etc error pages are not accepted. Remember, do not do anything illegal. Make sure you type the right URL, do not guess.
Hint: google is your friend.
http://google.com/search?q=site:nasa.gov
當時我的思路是找出所有以nasa.gov結尾的域名，然后遍歷這些網址。之后我真的寫了個python程序，取了google檢索出來的前1000個頁面，取出域名，保存起來，去除重復的有500多個。接著，讀取html頁面，判斷是否還有字符串。其間，遇到了個網速的問題，超時后經常會跑到電信的114搜索上去。驗證了170多個頁面后，我發現自己理解錯題目了，這里的URL并不是指URL以nasa.gov結尾，而是指URL的域名以nasa.gov結尾。我無語了，這相當于域名下的所有網頁都有可能。這個工作量巨大得幾乎是不可能的。暫時中止。
以下代碼可供參考，修改了n次，可能現在已經沒法直接運行。
2.5
1from urllib import FancyURLopener
2import urllib2
3import sys
4import re
5import locale
6"""
7class MyOpener(FancyURLopener):
8 version = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; it; rv:1.8.1.11)Gecko/20071127 Firefox/2.0.0.11'
9
10res = re.compile(r'(([a-zA-Z]+\.)+nasa.gov)')
11
12myopener = MyOpener()
13url = 'http://www.google.co.jp/search?&num=100&as_qdr=all&as_occt=any&as_sitesearch=nasa.gov'
14li = []
15for i in range(0, 10):
16 url = url + '&start=' + str(i*100)
17 page = myopener.open(url)
18 str1 = page.read()
19 for aItem in res.findall(str1):
20 if not aItem[0] in li:
21 li.append(aItem[0])
22"""
23with open('nasa.txt') as li:
24#li = open('nasa.txt')
25#print li.count
26 m = 0
27 for a in li:
28 #print 'http://'+a
29 m = m + 1
30 print m
31 url = a
32 req = urllib2.Request(url)
33 try:
34 response = urllib2.urlopen(req)
35 the_page = response.read()
36 with open(url + '.txt') as nasa:
37 write(the_page)
38 if the_page.find(r'daohang.118114.cn') <> -1 :
39 print '114'
40 elif the_page.find('2200178118', 0, 10240) <> -1 :
41 print url
42 else :
43 print '
'
44 except urllib2.URLError, e:
45 print e.reason
46
47"""
48#gUrl = 'http://www.google.co.jp/search?hl=ja&source=hp&q=site%3Anasa.gov&lr=&aq=f&oq='
49#google = urllib.urlopen(gUrl)
50#str = google.read()
51for str in open('sitenasa_gov.htm'):
52 for aItem in res.findall(str):
53 print aItem[0]
54
55#print str
56str = 'www.xxx.nasa.gov/wwf.nasa.gov'
57
58"""
59
60
61#2200178118
62
3.1
1from urllib.request import FancyURLopener
2import urllib
3import sys
4import re
5import locale
6"""
7class MyOpener(FancyURLopener):
8 version = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; it; rv:1.8.1.11)Gecko/20071127 Firefox/2.0.0.11'
9
10res = re.compile(r'(([a-zA-Z]+\.)+nasa.gov)')
11
12myopener = MyOpener()
13url = 'http://www.google.co.jp/search?&num=100&as_qdr=all&as_occt=any&as_sitesearch=nasa.gov'
14li = []
15for i in range(0, 10):
16 url = url + '&start=' + str(i*100)
17 page = myopener.open(url)
18 str1 = page.read()
19 for aItem in res.findall(str1):
20 if not aItem[0] in li:
21 li.append(aItem[0])
22"""
23fiPath = sys.argv[1]
24with open(fiPath) as li:
25#li = open('nasa.txt')
26#print li.count
27 m = 0
28 for a in li:
29 #print 'http://'+a
30 m = m + 1
31 #print m
32 url = a
33 req = urllib.request.Request(url)
34 try:
35 response = urllib.request.urlopen(req)
36 the_page = response.read()
37 with open(url[7:-1] + '.txt', 'wb') as nasa:
38 nasa.write(the_page)
39 nasa.flush()
40 if the_page.decode('utf8').find(r'icc.qonc.com') != -1:
41 print('114')
42 elif the_page.decode('utf8').find('2200178118', 0, 10240) != -1:
43 print(url)
44 else :
45 print('')
46 except urllib.error.URLError as e:
47 print(e.code)
48 except UnicodeDecodeError as UDE:
49 print(UDE)
50
51"""
52#gUrl = 'http://www.google.co.jp/search?hl=ja&source=hp&q=site%3Anasa.gov&lr=&aq=f&oq='
53#google = urllib.urlopen(gUrl)
54#str = google.read()
55for str in open('sitenasa_gov.htm'):
56 for aItem in res.findall(str):
57 print aItem[0]
58
59#print str
60str = 'www.xxx.nasa.gov/wwf.nasa.gov'
61
62"""
63
64
65#2200178118
66
而后，過了大概幾個月，變換思路，解決，意外的簡單……
事實上，只要向服務器提交數據，一般服務器也會將該數據返回到頁面上。該題最后的hint不是讓我們來搜該域名，而是告訴我們怎樣在google.com的頁面上顯示我們想要的數據。譬如
http://www.google.co.jp/search?q=2200178118 該頁面的前10K里應該包含了該字符串。接下來，我們只需要在nasa.gov上找個頁面提交數據就行了。
over