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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
/* ######################################################################
Proxy - Proxy related functions
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
#include<apt-pkg/configuration.h>
#include<apt-pkg/error.h>
#include<apt-pkg/fileutl.h>
#include<apt-pkg/strutl.h>
#include <algorithm>
#include<iostream>
#include<fcntl.h>
#include<unistd.h>
#include "proxy.h"
/*}}}*/
// AutoDetectProxy - auto detect proxy /*{{{*/
// ---------------------------------------------------------------------
/* */
static std::vector<std::string> CompatibleProxies(URI const &URL)
{
if (URL.Access == "http" || URL.Access == "https")
return {"http", "https", "socks5h"};
return {URL.Access};
}
bool AutoDetectProxy(URI &URL)
{
// we support both http/https debug options
bool Debug = _config->FindB("Debug::Acquire::"+URL.Access,false);
// the user already explicitly set a proxy for this host
if(_config->Find("Acquire::"+URL.Access+"::proxy::"+URL.Host, "") != "")
return true;
// option is "Acquire::http::Proxy-Auto-Detect" but we allow the old
// name without the dash ("-")
std::string AutoDetectProxyCmd = _config->Find("Acquire::"+URL.Access+"::Proxy-Auto-Detect",
_config->Find("Acquire::"+URL.Access+"::ProxyAutoDetect"));
if (AutoDetectProxyCmd.empty())
return true;
if (Debug)
std::clog << "Using auto proxy detect command: " << AutoDetectProxyCmd << std::endl;
if (faccessat(AT_FDCWD, AutoDetectProxyCmd.c_str(), R_OK | X_OK, AT_EACCESS) != 0)
return _error->Errno("access", "ProxyAutoDetect command '%s' can not be executed!", AutoDetectProxyCmd.c_str());
std::string const urlstring = URL;
std::vector<const char *> Args;
Args.push_back(AutoDetectProxyCmd.c_str());
Args.push_back(urlstring.c_str());
Args.push_back(nullptr);
FileFd PipeFd;
pid_t Child;
if(Popen(&Args[0], PipeFd, Child, FileFd::ReadOnly, false) == false)
return _error->Error("ProxyAutoDetect command '%s' failed!", AutoDetectProxyCmd.c_str());
char buf[512];
bool const goodread = PipeFd.ReadLine(buf, sizeof(buf)) != nullptr;
PipeFd.Close();
if (ExecWait(Child, "ProxyAutoDetect") == false)
return false;
// no output means the detector has no idea which proxy to use
// and apt will use the generic proxy settings
if (goodread == false)
return true;
auto const cleanedbuf = _strstrip(buf);
// We warn about this as the implementor probably meant to use DIRECT instead
if (cleanedbuf[0] == '\0')
{
_error->Warning("ProxyAutoDetect command returned an empty line");
return true;
}
if (Debug)
std::clog << "auto detect command returned: '" << cleanedbuf << "'" << std::endl;
auto compatibleTypes = CompatibleProxies(URL);
bool compatible = strcmp(cleanedbuf, "DIRECT") == 0 ||
compatibleTypes.end() != std::find_if(compatibleTypes.begin(),
compatibleTypes.end(), [cleanedbuf](std::string &compat) {
return strstr(cleanedbuf, compat.c_str()) == cleanedbuf;
});
if (compatible)
_config->Set("Acquire::"+URL.Access+"::proxy::"+URL.Host, cleanedbuf);
return true;
}
/*}}}*/
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