apt-pkg/contrib/proxy.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 /* ######################################################################
   4
   5    Proxy - Proxy releated functions
   6
   7    ##################################################################### */
   8                                                                         /*}}}*/
   9 // Include Files                                                        /*{{{*/
  10 #include<apt-pkg/configuration.h>
  11 #include<apt-pkg/error.h>
  12 #include<apt-pkg/fileutl.h>
  13 #include<apt-pkg/strutl.h>
  14
  15 #include<iostream>
  16 #include <unistd.h>
  17
  18 #include "proxy.h"
  19                                                                         /*}}}*/
  20
  21 // AutoDetectProxy - auto detect proxy                                  /*{{{*/
  22 // ---------------------------------------------------------------------
  23 /* */
  24 bool AutoDetectProxy(URI &URL)
  25 {
  26    // we support both http/https debug options
  27    bool Debug = _config->FindB("Debug::Acquire::"+URL.Access,false);
  28
  29    // the user already explicitly set a proxy for this host
  30    if(_config->Find("Acquire::"+URL.Access+"::proxy::"+URL.Host, "") != "")
  31       return true;
  32
  33    // option is "Acquire::http::Proxy-Auto-Detect" but we allow the old
  34    // name without the dash ("-")
  35    std::string AutoDetectProxyCmd = _config->Find("Acquire::"+URL.Access+"::Proxy-Auto-Detect",
  36                                       _config->Find("Acquire::"+URL.Access+"::ProxyAutoDetect"));
  37
  38    if (AutoDetectProxyCmd.empty())
  39       return true;
  40
  41    if (Debug)
  42       std::clog << "Using auto proxy detect command: " << AutoDetectProxyCmd << std::endl;
  43
  44    std::string const urlstring = URL;
  45    std::vector<const char *> Args;
  46    Args.push_back(AutoDetectProxyCmd.c_str());
  47    Args.push_back(urlstring.c_str());
  48    Args.push_back(nullptr);
  49    FileFd PipeFd;
  50    pid_t Child;
  51    if(Popen(&Args[0], PipeFd, Child, FileFd::ReadOnly, false) == false)
  52       return _error->Error("ProxyAutoDetect command '%s' failed!", AutoDetectProxyCmd.c_str());
  53    char buf[512];
  54    bool const goodread = PipeFd.ReadLine(buf, sizeof(buf)) != nullptr;
  55    PipeFd.Close();
  56    if (ExecWait(Child, "ProxyAutoDetect") == false)
  57       return false;
  58    // no output means the detector has no idea which proxy to use
  59    // and apt will use the generic proxy settings
  60    if (goodread == false)
  61       return true;
  62    auto const cleanedbuf = _strstrip(buf);
  63    // We warn about this as the implementor probably meant to use DIRECT instead
  64    if (cleanedbuf[0] == '\0')
  65    {
  66       _error->Warning("ProxyAutoDetect command returned an empty line");
  67       return true;
  68    }
  69
  70    if (Debug)
  71       std::clog << "auto detect command returned: '" << cleanedbuf << "'" << std::endl;
  72
  73    if (strstr(cleanedbuf, URL.Access.c_str()) == cleanedbuf || strcmp(cleanedbuf, "DIRECT") == 0)
  74       _config->Set("Acquire::"+URL.Access+"::proxy::"+URL.Host, cleanedbuf);
  75
  76    return true;
  77 }
  78                                                                         /*}}}*/