[tor-bugs] #5853 [Tor Client]: teach client to auto-udpate bridges

[Tor Bug Tracker & Wiki]

#5853: teach client to auto-udpate bridges
-------------------------+--------------------------------------------------
 Reporter:  phobos       |          Owner:     
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:     
Component:  Tor Client   |        Version:     
 Keywords:               |         Parent:     
   Points:               |   Actualpoints:     
-------------------------+--------------------------------------------------
 wbdzw at jit.si sends this code:

 #Used for auto update Tor Bridges
 #write by wbdzw#qq.com //replace#with @
 import os
 import re
 import http.client
 import urllib.parse
 import gzip

 STR_APP_DIR = os.environ["LOCALAPPDATA"] if "LOCALAPPDATA" in os.environ
 else os.environ["APPDATA"]
 STR_TOR_CFG = STR_APP_DIR + "\\Vidalia\\torrc"

 STR_BRIDGE_URL = "bridges.torproject.org"

 STR_HTML_PRE_TAG_START = "<pre id=\"bridges\">"
 STR_HTML_PRE_TAG_END = "</pre>"

 def FetchNewBridge():
     conn = http.client.HTTPSConnection(STR_BRIDGE_URL)
     headers = {"Content-Type": "text/xml",
                "Accept-Language": "zh-cn",
                "Accept-Encoding": "gzip, deflate",
                "Accept": "text/plain",
                "User-Agent": "Mozilla/4.0 (compatible; MSIE 8.0; Windows
 NT 5.1; Trident/4.0; QQDownload 691; .NET CLR 1.1.4322; .NET CLR
 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; CIBA; .NET4.0C;
 .NET4.0E; InfoPath.2; GreenBrowser)"
                }
     print("Requesting Bridges from Server"
     conn.request("GET", "/", None, headers)
     r1 = conn.getresponse()
     #print(r1.status)
     #print(r1.headers)

     strHtmlCont = ""
     if r1.headers.get("content-encoding"  == "gzip":
         szHtmlCont = gzip.decompress(r1.read())
         strHtmlCont = szHtmlCont.decode("utf-8"
         #print(strHtmlCont)
     conn.close()

     iPsTagStart = strHtmlCont.find(STR_HTML_PRE_TAG_START)
     iPsTagEnd = strHtmlCont.find(STR_HTML_PRE_TAG_END)

     if iPsTagStart == -1 or iPsTagEnd == -1:
         print("bridge not found"
         exit()

     strTmp = strHtmlCont[iPsTagStart +
 len(STR_HTML_PRE_TAG_START):iPsTagEnd]
     return strTmp

 def LoadBridges(lstBridgeHost):
     if len(lstBridgeHost) <= 0:
         return None
     else:
         nIdx = 0
         while nIdx < len(lstBridgeHost):
             aCurLine = lstBridgeHost[nIdx]
             if IsBridgeLine(aCurLine):
                 aBridgeHost = ""
                 aBridgeHost = ExtractBridgeHost(aCurLine)
                 aBridgeHost = aBridgeHost.replace("\n", ""
                 aBridgeHost = aBridgeHost.strip();
                 #g_lstHost.append(aBridgeHost)
                 #print("Add Old Bridge Host ", aBridgeHost)
             nIdx += 1

 def RemoveBridges(lstBridgeHost):
     if len(lstBridgeHost) <= 0:
         return None
     else:
         nIdx = 0
         while nIdx < len(lstBridgeHost):
             aCurLine = lstBridgeHost[nIdx]
             if IsBridgeLine(aCurLine):
                 lstBridgeHost.remove(aCurLine)
                 nIdx -= 1
                 #aCurLine.replace("\n", ""
                 #aCurLine.replace("\r", ""
                 print("Remove Line ", aCurLine)
             nIdx += 1

 def ExtractBridgeHost(aLine):
     return aLine.lower().replace("bridge", "" .strip()

 def IsBridgeLine(aLine):
     rslt = re.search("\\s*bridge\\s+", aLine, re.IGNORECASE)
     return rslt!=None

 def LoadTorCfgFile(strFilePath):
     #print(strFilePath)
     fTorCfg = open(strFilePath) # if no mode is specified, 'r'ead mode is
 assumed by default

     lstBridgeHost = []
     aLine = ""
     while True:
         aLine = fTorCfg.readline()
         if len(aLine) == 0: # Zero length indicates EOF
             break

         lstBridgeHost.append(aLine)

     fTorCfg.close() # close the file
     return lstBridgeHost

 def WriteCfgFile(lstTorCfgLines, strFilePath):
     fTorCfg = open(strFilePath, "w"
     if fTorCfg != None:
         for item in lstTorCfgLines:
             fTorCfg.write("%s" % item)
     fTorCfg.close()

 #Main
 g_lstHost = []
 lstTorCfgLines = LoadTorCfgFile(STR_TOR_CFG)
 LoadBridges(lstTorCfgLines)
 RemoveBridges(lstTorCfgLines)
 #print(lstTorCfgLines)

 strNewBridges = FetchNewBridge()
 #print(strNewBridges)

 nIdx = 0
 lstNewBridges = strNewBridges.splitlines()
 while nIdx<len(lstNewBridges):
     aLine = lstNewBridges[nIdx]
     if IsBridgeLine(aLine):
         aBridgeHost = ExtractBridgeHost(aLine)
         aBridgeHost.replace("\n", ""
         g_lstHost.append(aBridgeHost)
         print("Add New Bridge Host ", aBridgeHost)
     nIdx+=1

 lstUnique = list(set(g_lstHost))
 lstUnique.sort()

 for itm in lstUnique:
     print(itm)

 nIdx = 0
 while nIdx<len(lstUnique):
     aHost = lstUnique[nIdx]
     lstTorCfgLines.append("Bridge " + aHost + "\n"
     nIdx+=1

 WriteCfgFile(lstTorCfgLines, STR_TOR_CFG);
 os.system("pause");

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/5853>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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