// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: http.cc,v 1.59 2004/05/08 19:42:35 mdz Exp $ /* ###################################################################### HTTP Acquire Method - This is the HTTP acquire method for APT. It uses HTTP/1.1 and many of the fancy options there-in, such as pipelining, range, if-range and so on. It is based on a doubly buffered select loop. A groupe of requests are fed into a single output buffer that is constantly fed out the socket. This provides ideal pipelining as in many cases all of the requests will fit into a single packet. The input socket is buffered the same way and fed into the fd for the file (may be a pipe in future). This double buffering provides fairly substantial transfer rates, compared to wget the http method is about 4% faster. Most importantly, when HTTP is compared with FTP as a protocol the speed difference is huge. In tests over the internet from two sites to llug (via ATM) this program got 230k/s sustained http transfer rates. FTP on the other hand topped out at 170k/s. That combined with the time to setup the FTP connection makes HTTP a vastly superior protocol. ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ #include <config.h> #include <apt-pkg/fileutl.h> #include <apt-pkg/acquire-method.h> #include <apt-pkg/configuration.h> #include <apt-pkg/error.h> #include <apt-pkg/hashes.h> #include <apt-pkg/netrc.h> #include <apt-pkg/strutl.h> #include <apt-pkg/proxy.h> #include <stddef.h> #include <stdlib.h> #include <sys/select.h> #include <cstring> #include <sys/stat.h> #include <sys/time.h> #include <unistd.h> #include <stdio.h> #include <errno.h> #include <iostream> #include <sstream> #include "config.h" #include "connect.h" #include "http.h" #include <apti18n.h> /*}}}*/ using namespace std; unsigned long long CircleBuf::BwReadLimit=0; unsigned long long CircleBuf::BwTickReadData=0; struct timeval CircleBuf::BwReadTick={0,0}; const unsigned int CircleBuf::BW_HZ=10; // CircleBuf::CircleBuf - Circular input buffer /*{{{*/ // --------------------------------------------------------------------- /* */ CircleBuf::CircleBuf(unsigned long long Size) : Size(Size), Hash(NULL), TotalWriten(0) { Buf = new unsigned char[Size]; Reset(); CircleBuf::BwReadLimit = _config->FindI("Acquire::http::Dl-Limit",0)*1024; } /*}}}*/ // CircleBuf::Reset - Reset to the default state /*{{{*/ // --------------------------------------------------------------------- /* */ void CircleBuf::Reset() { InP = 0; OutP = 0; StrPos = 0; TotalWriten = 0; MaxGet = (unsigned long long)-1; OutQueue = string(); if (Hash != NULL) { delete Hash; Hash = NULL; } } /*}}}*/ // CircleBuf::Read - Read from a FD into the circular buffer /*{{{*/ // --------------------------------------------------------------------- /* This fills up the buffer with as much data as is in the FD, assuming it is non-blocking.. */ bool CircleBuf::Read(int Fd) { while (1) { // Woops, buffer is full if (InP - OutP == Size) return true; // what's left to read in this tick unsigned long long const BwReadMax = CircleBuf::BwReadLimit/BW_HZ; if(CircleBuf::BwReadLimit) { struct timeval now; gettimeofday(&now,0); unsigned long long d = (now.tv_sec-CircleBuf::BwReadTick.tv_sec)*1000000 + now.tv_usec-CircleBuf::BwReadTick.tv_usec; if(d > 1000000/BW_HZ) { CircleBuf::BwReadTick = now; CircleBuf::BwTickReadData = 0; } if(CircleBuf::BwTickReadData >= BwReadMax) { usleep(1000000/BW_HZ); return true; } } // Write the buffer segment ssize_t Res; if(CircleBuf::BwReadLimit) { Res = read(Fd,Buf + (InP%Size), BwReadMax > LeftRead() ? LeftRead() : BwReadMax); } else Res = read(Fd,Buf + (InP%Size),LeftRead()); if(Res > 0 && BwReadLimit > 0) CircleBuf::BwTickReadData += Res; if (Res == 0) return false; if (Res < 0) { if (errno == EAGAIN) return true; return false; } if (InP == 0) gettimeofday(&Start,0); InP += Res; } } /*}}}*/ // CircleBuf::Read - Put the string into the buffer /*{{{*/ // --------------------------------------------------------------------- /* This will hold the string in and fill the buffer with it as it empties */ bool CircleBuf::Read(string Data) { OutQueue += Data; FillOut(); return true; } /*}}}*/ // CircleBuf::FillOut - Fill the buffer from the output queue /*{{{*/ // --------------------------------------------------------------------- /* */ void CircleBuf::FillOut() { if (OutQueue.empty() == true) return; while (1) { // Woops, buffer is full if (InP - OutP == Size) return; // Write the buffer segment unsigned long long Sz = LeftRead(); if (OutQueue.length() - StrPos < Sz) Sz = OutQueue.length() - StrPos; memcpy(Buf + (InP%Size),OutQueue.c_str() + StrPos,Sz); // Advance StrPos += Sz; InP += Sz; if (OutQueue.length() == StrPos) { StrPos = 0; OutQueue = ""; return; } } } /*}}}*/ // CircleBuf::Write - Write from the buffer into a FD /*{{{*/ // --------------------------------------------------------------------- /* This empties the buffer into the FD. */ bool CircleBuf::Write(int Fd) { while (1) { FillOut(); // Woops, buffer is empty if (OutP == InP) return true; if (OutP == MaxGet) return true; // Write the buffer segment ssize_t Res; Res = write(Fd,Buf + (OutP%Size),LeftWrite()); if (Res == 0) return false; if (Res < 0) { if (errno == EAGAIN) return true; return false; } TotalWriten += Res; if (Hash != NULL) Hash->Add(Buf + (OutP%Size),Res); OutP += Res; } } /*}}}*/ // CircleBuf::WriteTillEl - Write from the buffer to a string /*{{{*/ // --------------------------------------------------------------------- /* This copies till the first empty line */ bool CircleBuf::WriteTillEl(string &Data,bool Single) { // We cheat and assume it is unneeded to have more than one buffer load for (unsigned long long I = OutP; I < InP; I++) { if (Buf[I%Size] != '\n') continue; ++I; if (Single == false) { if (I < InP && Buf[I%Size] == '\r') ++I; if (I >= InP || Buf[I%Size] != '\n') continue; ++I; } Data = ""; while (OutP < I) { unsigned long long Sz = LeftWrite(); if (Sz == 0) return false; if (I - OutP < Sz) Sz = I - OutP; Data += string((char *)(Buf + (OutP%Size)),Sz); OutP += Sz; } return true; } return false; } /*}}}*/ // CircleBuf::Stats - Print out stats information /*{{{*/ // --------------------------------------------------------------------- /* */ void CircleBuf::Stats() { if (InP == 0) return; struct timeval Stop; gettimeofday(&Stop,0); /* float Diff = Stop.tv_sec - Start.tv_sec + (float)(Stop.tv_usec - Start.tv_usec)/1000000; clog << "Got " << InP << " in " << Diff << " at " << InP/Diff << endl;*/ } /*}}}*/ CircleBuf::~CircleBuf() { delete [] Buf; delete Hash; } // HttpServerState::HttpServerState - Constructor /*{{{*/ HttpServerState::HttpServerState(URI Srv,HttpMethod *Owner) : ServerState(Srv, Owner), In(64*1024), Out(4*1024) { TimeOut = _config->FindI("Acquire::http::Timeout",TimeOut); Reset(); } /*}}}*/ // HttpServerState::Open - Open a connection to the server /*{{{*/ // --------------------------------------------------------------------- /* This opens a connection to the server. */ bool HttpServerState::Open() { // Use the already open connection if possible. if (ServerFd != -1) return true; Close(); In.Reset(); Out.Reset(); Persistent = true; // Determine the proxy setting AutoDetectProxy(ServerName); string SpecificProxy = _config->Find("Acquire::http::Proxy::" + ServerName.Host); if (!SpecificProxy.empty()) { if (SpecificProxy == "DIRECT") Proxy = ""; else Proxy = SpecificProxy; } else { string DefProxy = _config->Find("Acquire::http::Proxy"); if (!DefProxy.empty()) { Proxy = DefProxy; } else { char* result = getenv("http_proxy"); Proxy = result ? result : ""; } } // Parse no_proxy, a , separated list of domains if (getenv("no_proxy") != 0) { if (CheckDomainList(ServerName.Host,getenv("no_proxy")) == true) Proxy = ""; } // Determine what host and port to use based on the proxy settings int Port = 0; string Host; if (Proxy.empty() == true || Proxy.Host.empty() == true) { if (ServerName.Port != 0) Port = ServerName.Port; Host = ServerName.Host; } else { if (Proxy.Port != 0) Port = Proxy.Port; Host = Proxy.Host; } // Connect to the remote server if (Connect(Host,Port,"http",80,ServerFd,TimeOut,Owner) == false) return false; return true; } /*}}}*/ // HttpServerState::Close - Close a connection to the server /*{{{*/ // --------------------------------------------------------------------- /* */ bool HttpServerState::Close() { close(ServerFd); ServerFd = -1; return true; } /*}}}*/ // HttpServerState::RunData - Transfer the data from the socket /*{{{*/ bool HttpServerState::RunData(FileFd * const File) { State = Data; // Chunked transfer encoding is fun.. if (Encoding == Chunked) { while (1) { // Grab the block size bool Last = true; string Data; In.Limit(-1); do { if (In.WriteTillEl(Data,true) == true) break; } while ((Last = Go(false, File)) == true); if (Last == false) return false; // See if we are done unsigned long long Len = strtoull(Data.c_str(),0,16); if (Len == 0) { In.Limit(-1); // We have to remove the entity trailer Last = true; do { if (In.WriteTillEl(Data,true) == true && Data.length() <= 2) break; } while ((Last = Go(false, File)) == true); if (Last == false) return false; return !_error->PendingError(); } // Transfer the block In.Limit(Len); while (Go(true, File) == true) if (In.IsLimit() == true) break; // Error if (In.IsLimit() == false) return false; // The server sends an extra new line before the next block specifier.. In.Limit(-1); Last = true; do { if (In.WriteTillEl(Data,true) == true) break; } while ((Last = Go(false, File)) == true); if (Last == false) return false; } } else { /* Closes encoding is used when the server did not specify a size, the loss of the connection means we are done */ if (Persistent == false) In.Limit(-1); else if (JunkSize != 0) In.Limit(JunkSize); else In.Limit(DownloadSize); // Just transfer the whole block. do { if (In.IsLimit() == false) continue; In.Limit(-1); return !_error->PendingError(); } while (Go(true, File) == true); } return Owner->Flush() && !_error->PendingError(); } /*}}}*/ bool HttpServerState::ReadHeaderLines(std::string &Data) /*{{{*/ { return In.WriteTillEl(Data); } /*}}}*/ bool HttpServerState::LoadNextResponse(bool const ToFile, FileFd * const File)/*{{{*/ { return Go(ToFile, File); } /*}}}*/ bool HttpServerState::WriteResponse(const std::string &Data) /*{{{*/ { return Out.Read(Data); } /*}}}*/ APT_PURE bool HttpServerState::IsOpen() /*{{{*/ { return (ServerFd != -1); } /*}}}*/ bool HttpServerState::InitHashes(HashStringList const &ExpectedHashes) /*{{{*/ { delete In.Hash; In.Hash = new Hashes(ExpectedHashes); return true; } /*}}}*/ APT_PURE Hashes * HttpServerState::GetHashes() /*{{{*/ { return In.Hash; } /*}}}*/ // HttpServerState::Die - The server has closed the connection. /*{{{*/ bool HttpServerState::Die(FileFd * const File) { unsigned int LErrno = errno; // Dump the buffer to the file if (State == ServerState::Data) { if (File == nullptr) return true; // on GNU/kFreeBSD, apt dies on /dev/null because non-blocking // can't be set if (File->Name() != "/dev/null") SetNonBlock(File->Fd(),false); while (In.WriteSpace() == true) { if (In.Write(File->Fd()) == false) return _error->Errno("write",_("Error writing to the file")); // Done if (In.IsLimit() == true) return true; } } // See if this is because the server finished the data stream if (In.IsLimit() == false && State != HttpServerState::Header && Persistent == true) { Close(); if (LErrno == 0) return _error->Error(_("Error reading from server. Remote end closed connection")); errno = LErrno; return _error->Errno("read",_("Error reading from server")); } else { In.Limit(-1); // Nothing left in the buffer if (In.WriteSpace() == false) return false; // We may have got multiple responses back in one packet.. Close(); return true; } return false; } /*}}}*/ // HttpServerState::Flush - Dump the buffer into the file /*{{{*/ // --------------------------------------------------------------------- /* This takes the current input buffer from the Server FD and writes it into the file */ bool HttpServerState::Flush(FileFd * const File) { if (File != NULL) { // on GNU/kFreeBSD, apt dies on /dev/null because non-blocking // can't be set if (File->Name() != "/dev/null") SetNonBlock(File->Fd(),false); if (In.WriteSpace() == false) return true; while (In.WriteSpace() == true) { if (In.Write(File->Fd()) == false) return _error->Errno("write",_("Error writing to file")); if (In.IsLimit() == true) return true; } if (In.IsLimit() == true || Persistent == false) return true; } return false; } /*}}}*/ // HttpServerState::Go - Run a single loop /*{{{*/ // --------------------------------------------------------------------- /* This runs the select loop over the server FDs, Output file FDs and stdin. */ bool HttpServerState::Go(bool ToFile, FileFd * const File) { // Server has closed the connection if (ServerFd == -1 && (In.WriteSpace() == false || ToFile == false)) return false; fd_set rfds,wfds; FD_ZERO(&rfds); FD_ZERO(&wfds); /* Add the server. We only send more requests if the connection will be persisting */ if (Out.WriteSpace() == true && ServerFd != -1 && Persistent == true) FD_SET(ServerFd,&wfds); if (In.ReadSpace() == true && ServerFd != -1) FD_SET(ServerFd,&rfds); // Add the file int FileFD = -1; if (File != NULL) FileFD = File->Fd(); if (In.WriteSpace() == true && ToFile == true && FileFD != -1) FD_SET(FileFD,&wfds); // Add stdin if (_config->FindB("Acquire::http::DependOnSTDIN", true) == true) FD_SET(STDIN_FILENO,&rfds); // Figure out the max fd int MaxFd = FileFD; if (MaxFd < ServerFd) MaxFd = ServerFd; // Select struct timeval tv; tv.tv_sec = TimeOut; tv.tv_usec = 0; int Res = 0; if ((Res = select(MaxFd+1,&rfds,&wfds,0,&tv)) < 0) { if (errno == EINTR) return true; return _error->Errno("select",_("Select failed")); } if (Res == 0) { _error->Error(_("Connection timed out")); return Die(File); } // Handle server IO if (ServerFd != -1 && FD_ISSET(ServerFd,&rfds)) { errno = 0; if (In.Read(ServerFd) == false) return Die(File); } if (ServerFd != -1 && FD_ISSET(ServerFd,&wfds)) { errno = 0; if (Out.Write(ServerFd) == false) return Die(File); } // Send data to the file if (FileFD != -1 && FD_ISSET(FileFD,&wfds)) { if (In.Write(FileFD) == false) return _error->Errno("write",_("Error writing to output file")); } if (MaximumSize > 0 && File && File->Tell() > MaximumSize) { Owner->SetFailReason("MaximumSizeExceeded"); return _error->Error("Writing more data than expected (%llu > %llu)", File->Tell(), MaximumSize); } // Handle commands from APT if (FD_ISSET(STDIN_FILENO,&rfds)) { if (Owner->Run(true) != -1) exit(100); } return true; } /*}}}*/ // HttpMethod::SendReq - Send the HTTP request /*{{{*/ // --------------------------------------------------------------------- /* This places the http request in the outbound buffer */ void HttpMethod::SendReq(FetchItem *Itm) { URI Uri = Itm->Uri; // The HTTP server expects a hostname with a trailing :port std::stringstream Req; string ProperHost; if (Uri.Host.find(':') != string::npos) ProperHost = '[' + Uri.Host + ']'; else ProperHost = Uri.Host; /* RFC 2616 ยง5.1.2 requires absolute URIs for requests to proxies, but while its a must for all servers to accept absolute URIs, it is assumed clients will sent an absolute path for non-proxies */ std::string requesturi; if (Server->Proxy.empty() == true || Server->Proxy.Host.empty()) requesturi = Uri.Path; else requesturi = Itm->Uri; // The "+" is encoded as a workaround for a amazon S3 bug // see LP bugs #1003633 and #1086997. requesturi = QuoteString(requesturi, "+~ "); /* Build the request. No keep-alive is included as it is the default in 1.1, can cause problems with proxies, and we are an HTTP/1.1 client anyway. C.f. https://tools.ietf.org/wg/httpbis/trac/ticket/158 */ Req << "GET " << requesturi << " HTTP/1.1\r\n"; if (Uri.Port != 0) Req << "Host: " << ProperHost << ":" << std::to_string(Uri.Port) << "\r\n"; else Req << "Host: " << ProperHost << "\r\n"; // generate a cache control header (if needed) if (_config->FindB("Acquire::http::No-Cache",false) == true) Req << "Cache-Control: no-cache\r\n" << "Pragma: no-cache\r\n"; else if (Itm->IndexFile == true) Req << "Cache-Control: max-age=" << std::to_string(_config->FindI("Acquire::http::Max-Age",0)) << "\r\n"; else if (_config->FindB("Acquire::http::No-Store",false) == true) Req << "Cache-Control: no-store\r\n"; // If we ask for uncompressed files servers might respond with content- // negotiation which lets us end up with compressed files we do not support, // see 657029, 657560 and co, so if we have no extension on the request // ask for text only. As a sidenote: If there is nothing to negotate servers // seem to be nice and ignore it. if (_config->FindB("Acquire::http::SendAccept", true) == true) { size_t const filepos = Itm->Uri.find_last_of('/'); string const file = Itm->Uri.substr(filepos + 1); if (flExtension(file) == file) Req << "Accept: text/*\r\n"; } // Check for a partial file and send if-queries accordingly struct stat SBuf; if (stat(Itm->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0) Req << "Range: bytes=" << std::to_string(SBuf.st_size) << "-\r\n" << "If-Range: " << TimeRFC1123(SBuf.st_mtime) << "\r\n"; else if (Itm->LastModified != 0) Req << "If-Modified-Since: " << TimeRFC1123(Itm->LastModified).c_str() << "\r\n"; if (Server->Proxy.User.empty() == false || Server->Proxy.Password.empty() == false) Req << "Proxy-Authorization: Basic " << Base64Encode(Server->Proxy.User + ":" + Server->Proxy.Password) << "\r\n"; maybe_add_auth (Uri, _config->FindFile("Dir::Etc::netrc")); if (Uri.User.empty() == false || Uri.Password.empty() == false) Req << "Authorization: Basic " << Base64Encode(Uri.User + ":" + Uri.Password) << "\r\n"; Req << "User-Agent: " << _config->Find("Acquire::http::User-Agent", "Debian APT-HTTP/1.3 (" PACKAGE_VERSION ")") << "\r\n"; Req << "\r\n"; if (Debug == true) cerr << Req.str() << endl; Server->WriteResponse(Req.str()); } /*}}}*/ // HttpMethod::Configuration - Handle a configuration message /*{{{*/ // --------------------------------------------------------------------- /* We stash the desired pipeline depth */ bool HttpMethod::Configuration(string Message) { if (ServerMethod::Configuration(Message) == false) return false; AllowRedirect = _config->FindB("Acquire::http::AllowRedirect",true); PipelineDepth = _config->FindI("Acquire::http::Pipeline-Depth", PipelineDepth); Debug = _config->FindB("Debug::Acquire::http",false); return true; } /*}}}*/ std::unique_ptr<ServerState> HttpMethod::CreateServerState(URI const &uri)/*{{{*/ { return std::unique_ptr<ServerState>(new HttpServerState(uri, this)); } /*}}}*/ void HttpMethod::RotateDNS() /*{{{*/ { ::RotateDNS(); } /*}}}*/