// -*- 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, 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; } /*}}}*/