1 files changed, 99 insertions, 0 deletions
diff --git a/apt-pkg/contrib/proxy.cc b/apt-pkg/contrib/proxy.cc
new file mode 100644
index 0000000..a99f44f
--- /dev/null
+++ b/apt-pkg/contrib/proxy.cc
@@ -0,0 +1,99 @@
+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+/* ######################################################################
+   
+   Proxy - Proxy related functions
+   
+   ##################################################################### */
+									/*}}}*/
+// Include Files							/*{{{*/
+#include <config.h>
+
+#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, true) == 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;
+}
+									/*}}}*/