// -*- 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). ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ #include <config.h> #include <apt-pkg/configuration.h> #include <apt-pkg/error.h> #include <apt-pkg/fileutl.h> #include <apt-pkg/hashes.h> #include <apt-pkg/proxy.h> #include <apt-pkg/strutl.h> #include <cstring> #include <iostream> #include <sstream> #include <arpa/inet.h> #include <errno.h> #include <signal.h> #include <stddef.h> #include <stdio.h> #include <stdlib.h> #include <sys/select.h> #include <sys/stat.h> #include <sys/time.h> #include <unistd.h> #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(HttpMethod const * const Owner, unsigned long long Size) : Size(Size), Hash(NULL), TotalWriten(0) { Buf = new unsigned char[Size]; Reset(); CircleBuf::BwReadLimit = Owner->ConfigFindI("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(std::unique_ptr<MethodFd> const &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 = Fd->Read(Buf + (InP % Size), BwReadMax > LeftRead() ? LeftRead() : BwReadMax); } else Res = Fd->Read(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 const &Data) { OutQueue.append(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(std::unique_ptr<MethodFd> const &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 = Fd->Write(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::Write - Write from the buffer to a string /*{{{*/ // --------------------------------------------------------------------- /* This copies everything */ bool CircleBuf::Write(string &Data) { Data = std::string((char *)Buf + (OutP % Size), LeftWrite()); OutP += LeftWrite(); return true; } /*}}}*/ // 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; } /*}}}*/ // UnwrapHTTPConnect - Does the HTTP CONNECT handshake /*{{{*/ // --------------------------------------------------------------------- /* Performs a TLS handshake on the socket */ struct HttpConnectFd : public MethodFd { std::unique_ptr<MethodFd> UnderlyingFd; std::string Buffer; int Fd() APT_OVERRIDE { return UnderlyingFd->Fd(); } ssize_t Read(void *buf, size_t count) APT_OVERRIDE { if (!Buffer.empty()) { auto read = count < Buffer.size() ? count : Buffer.size(); memcpy(buf, Buffer.data(), read); Buffer.erase(Buffer.begin(), Buffer.begin() + read); return read; } return UnderlyingFd->Read(buf, count); } ssize_t Write(void *buf, size_t count) APT_OVERRIDE { return UnderlyingFd->Write(buf, count); } int Close() APT_OVERRIDE { return UnderlyingFd->Close(); } bool HasPending() APT_OVERRIDE { return !Buffer.empty(); } }; static ResultState UnwrapHTTPConnect(std::string Host, int Port, URI Proxy, std::unique_ptr<MethodFd> &Fd, unsigned long Timeout, aptAuthConfMethod *Owner) { Owner->Status(_("Connecting to %s (%s)"), "HTTP proxy", URI::SiteOnly(Proxy).c_str()); // The HTTP server expects a hostname with a trailing :port std::stringstream Req; std::string ProperHost; if (Host.find(':') != std::string::npos) ProperHost = '[' + Proxy.Host + ']'; else ProperHost = Proxy.Host; // Build the connect Req << "CONNECT " << Host << ":" << std::to_string(Port) << " HTTP/1.1\r\n"; if (Proxy.Port != 0) Req << "Host: " << ProperHost << ":" << std::to_string(Proxy.Port) << "\r\n"; else Req << "Host: " << ProperHost << "\r\n"; Owner->MaybeAddAuthTo(Proxy); if (Proxy.User.empty() == false || Proxy.Password.empty() == false) Req << "Proxy-Authorization: Basic " << Base64Encode(Proxy.User + ":" + Proxy.Password) << "\r\n"; Req << "User-Agent: " << Owner->ConfigFind("User-Agent", "Debian APT-HTTP/1.3 (" PACKAGE_VERSION ")") << "\r\n"; Req << "\r\n"; CircleBuf In(dynamic_cast<HttpMethod *>(Owner), 4096); CircleBuf Out(dynamic_cast<HttpMethod *>(Owner), 4096); std::string Headers; if (Owner->DebugEnabled() == true) cerr << Req.str() << endl; Out.Read(Req.str()); // Writing from proxy while (Out.WriteSpace() > 0) { if (WaitFd(Fd->Fd(), true, Timeout) == false) { _error->Errno("select", "Writing to proxy failed"); return ResultState::TRANSIENT_ERROR; } if (Out.Write(Fd) == false) { _error->Errno("write", "Writing to proxy failed"); return ResultState::TRANSIENT_ERROR; } } while (In.ReadSpace() > 0) { if (WaitFd(Fd->Fd(), false, Timeout) == false) { _error->Errno("select", "Reading from proxy failed"); return ResultState::TRANSIENT_ERROR; } if (In.Read(Fd) == false) { _error->Errno("read", "Reading from proxy failed"); return ResultState::TRANSIENT_ERROR; } if (In.WriteTillEl(Headers)) break; } if (Owner->DebugEnabled() == true) cerr << Headers << endl; if (!(APT::String::Startswith(Headers, "HTTP/1.0 200") || APT::String::Startswith(Headers, "HTTP/1.1 200"))) { _error->Error("Invalid response from proxy: %s", Headers.c_str()); return ResultState::TRANSIENT_ERROR; } if (In.WriteSpace() > 0) { // Maybe there is actual data already read, if so we need to buffer it std::unique_ptr<HttpConnectFd> NewFd(new HttpConnectFd()); In.Write(NewFd->Buffer); NewFd->UnderlyingFd = std::move(Fd); Fd = std::move(NewFd); } return ResultState::SUCCESSFUL; } /*}}}*/ // HttpServerState::HttpServerState - Constructor /*{{{*/ HttpServerState::HttpServerState(URI Srv,HttpMethod *Owner) : ServerState(Srv, Owner), In(Owner, 64*1024), Out(Owner, 4*1024) { TimeOut = Owner->ConfigFindI("Timeout", TimeOut); ServerFd = MethodFd::FromFd(-1); Reset(); } /*}}}*/ // HttpServerState::Open - Open a connection to the server /*{{{*/ // --------------------------------------------------------------------- /* This opens a connection to the server. */ ResultState HttpServerState::Open() { // Use the already open connection if possible. if (ServerFd->Fd() != -1) return ResultState::SUCCESSFUL; Close(); In.Reset(); Out.Reset(); Persistent = true; bool tls = (ServerName.Access == "https" || APT::String::Endswith(ServerName.Access, "+https")); // Determine the proxy setting // Used to run AutoDetectProxy(ServerName) here, but we now send a Proxy // header in the URI Acquire request and set "Acquire::"+uri.Access+"::proxy::"+uri.Host // to it in BaseHttpMethod::Loop() string SpecificProxy = Owner->ConfigFind("Proxy::" + ServerName.Host, ""); if (!SpecificProxy.empty()) { if (SpecificProxy == "DIRECT") Proxy = ""; else Proxy = SpecificProxy; } else { string DefProxy = Owner->ConfigFind("Proxy", ""); if (!DefProxy.empty()) { Proxy = DefProxy; } else { char *result = getenv("http_proxy"); Proxy = result ? result : ""; if (tls == true) { char *result = getenv("https_proxy"); if (result != nullptr) { Proxy = result; } } } } // Parse no_proxy, a , separated list of domains if (getenv("no_proxy") != 0) { if (CheckDomainList(ServerName.Host,getenv("no_proxy")) == true) Proxy = ""; } if (Proxy.empty() == false) Owner->AddProxyAuth(Proxy, ServerName); auto const DefaultService = tls ? "https" : "http"; auto const DefaultPort = tls ? 443 : 80; if (Proxy.Access == "socks5h") { auto result = Connect(Proxy.Host, Proxy.Port, "socks", 1080, ServerFd, TimeOut, Owner); if (result != ResultState::SUCCESSFUL) return result; result = UnwrapSocks(ServerName.Host, ServerName.Port == 0 ? DefaultPort : ServerName.Port, Proxy, ServerFd, Owner->ConfigFindI("TimeOut", 120), Owner); if (result != ResultState::SUCCESSFUL) return result; } else { // 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.Access != "http" && Proxy.Access != "https") { _error->Error("Unsupported proxy configured: %s", URI::SiteOnly(Proxy).c_str()); return ResultState::FATAL_ERROR; } else { if (Proxy.Port != 0) Port = Proxy.Port; Host = Proxy.Host; if (Proxy.Access == "https" && Port == 0) Port = 443; } auto result = Connect(Host, Port, DefaultService, DefaultPort, ServerFd, TimeOut, Owner); if (result != ResultState::SUCCESSFUL) return result; if (Host == Proxy.Host && Proxy.Access == "https") { result = UnwrapTLS(Proxy.Host, ServerFd, TimeOut, Owner); if (result != ResultState::SUCCESSFUL) return result; } if (Host == Proxy.Host && tls) { result = UnwrapHTTPConnect(ServerName.Host, ServerName.Port == 0 ? DefaultPort : ServerName.Port, Proxy, ServerFd, Owner->ConfigFindI("TimeOut", 120), Owner); if (result != ResultState::SUCCESSFUL) return result; } } if (tls) return UnwrapTLS(ServerName.Host, ServerFd, TimeOut, Owner); return ResultState::SUCCESSFUL; } /*}}}*/ // HttpServerState::Close - Close a connection to the server /*{{{*/ // --------------------------------------------------------------------- /* */ bool HttpServerState::Close() { ServerFd->Close(); return true; } /*}}}*/ // HttpServerState::RunData - Transfer the data from the socket /*{{{*/ ResultState HttpServerState::RunData(RequestState &Req) { Req.State = RequestState::Data; // Chunked transfer encoding is fun.. if (Req.Encoding == RequestState::Chunked) { while (1) { // Grab the block size ResultState Last = ResultState::SUCCESSFUL; string Data; In.Limit(-1); do { if (In.WriteTillEl(Data,true) == true) break; } while ((Last = Go(false, Req)) == ResultState::SUCCESSFUL); if (Last != ResultState::SUCCESSFUL) return Last; // 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 = ResultState::SUCCESSFUL; do { if (In.WriteTillEl(Data,true) == true && Data.length() <= 2) break; } while ((Last = Go(false, Req)) == ResultState::SUCCESSFUL); return Last; } // Transfer the block In.Limit(Len); while (Go(true, Req) == ResultState::SUCCESSFUL) if (In.IsLimit() == true) break; // Error if (In.IsLimit() == false) return ResultState::TRANSIENT_ERROR; // The server sends an extra new line before the next block specifier.. In.Limit(-1); Last = ResultState::SUCCESSFUL; do { if (In.WriteTillEl(Data,true) == true) break; } while ((Last = Go(false, Req)) == ResultState::SUCCESSFUL); if (Last != ResultState::SUCCESSFUL) return Last; } } else { /* Closes encoding is used when the server did not specify a size, the loss of the connection means we are done */ if (Req.JunkSize != 0) In.Limit(Req.JunkSize); else if (Req.DownloadSize != 0) { if (Req.MaximumSize != 0 && Req.DownloadSize > Req.MaximumSize) { Owner->SetFailReason("MaximumSizeExceeded"); _error->Error(_("File has unexpected size (%llu != %llu). Mirror sync in progress?"), Req.DownloadSize, Req.MaximumSize); return ResultState::FATAL_ERROR; } In.Limit(Req.DownloadSize); } else if (Persistent == false) In.Limit(-1); // Just transfer the whole block. while (true) { if (In.IsLimit() == false) { auto const result = Go(true, Req); if (result == ResultState::SUCCESSFUL) continue; return result; } In.Limit(-1); return _error->PendingError() ? ResultState::FATAL_ERROR : ResultState::SUCCESSFUL; } } if (Flush(&Req.File) == false) return ResultState::TRANSIENT_ERROR; return ResultState::SUCCESSFUL; } /*}}}*/ ResultState HttpServerState::RunDataToDevNull(RequestState &Req) /*{{{*/ { // no need to clean up if we discard the connection anyhow if (Persistent == false) return ResultState::SUCCESSFUL; Req.File.Open("/dev/null", FileFd::WriteOnly); return RunData(Req); } /*}}}*/ bool HttpServerState::ReadHeaderLines(std::string &Data) /*{{{*/ { return In.WriteTillEl(Data); } /*}}}*/ ResultState HttpServerState::LoadNextResponse(bool const ToFile, RequestState &Req) /*{{{*/ { return Go(ToFile, Req); } /*}}}*/ bool HttpServerState::WriteResponse(const std::string &Data) /*{{{*/ { return Out.Read(Data); } /*}}}*/ APT_PURE bool HttpServerState::IsOpen() /*{{{*/ { return (ServerFd->Fd() != -1); } /*}}}*/ bool HttpServerState::InitHashes(HashStringList const &ExpectedHashes) /*{{{*/ { delete In.Hash; In.Hash = new Hashes(ExpectedHashes); return true; } /*}}}*/ void HttpServerState::Reset() /*{{{*/ { ServerState::Reset(); ServerFd->Close(); } /*}}}*/ APT_PURE Hashes * HttpServerState::GetHashes() /*{{{*/ { return In.Hash; } /*}}}*/ // HttpServerState::Die - The server has closed the connection. /*{{{*/ ResultState HttpServerState::Die(RequestState &Req) { unsigned int LErrno = errno; // Dump the buffer to the file if (Req.State == RequestState::Data) { if (Req.File.IsOpen() == false) return ResultState::SUCCESSFUL; // on GNU/kFreeBSD, apt dies on /dev/null because non-blocking // can't be set if (Req.File.Name() != "/dev/null") SetNonBlock(Req.File.Fd(),false); while (In.WriteSpace() == true) { if (In.Write(MethodFd::FromFd(Req.File.Fd())) == false) { _error->Errno("write", _("Error writing to the file")); return ResultState::TRANSIENT_ERROR; } // Done if (In.IsLimit() == true) return ResultState::SUCCESSFUL; } } // See if this is because the server finished the data stream if (In.IsLimit() == false && Req.State != RequestState::Header && Persistent == true) { Close(); if (LErrno == 0) { _error->Error(_("Error reading from server. Remote end closed connection")); return ResultState::TRANSIENT_ERROR; } errno = LErrno; _error->Errno("read", _("Error reading from server")); return ResultState::TRANSIENT_ERROR; } else { In.Limit(-1); // Nothing left in the buffer if (In.WriteSpace() == false) return ResultState::TRANSIENT_ERROR; // We may have got multiple responses back in one packet.. Close(); return ResultState::SUCCESSFUL; } return ResultState::TRANSIENT_ERROR; } /*}}}*/ // 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 != nullptr) { // 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(MethodFd::FromFd(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. */ ResultState HttpServerState::Go(bool ToFile, RequestState &Req) { // Server has closed the connection if (ServerFd->Fd() == -1 && (In.WriteSpace() == false || ToFile == false)) return ResultState::TRANSIENT_ERROR; // Handle server IO if (ServerFd->HasPending() && In.ReadSpace() == true) { errno = 0; if (In.Read(ServerFd) == false) return Die(Req); } 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->Fd() != -1 && Persistent == true) FD_SET(ServerFd->Fd(), &wfds); if (In.ReadSpace() == true && ServerFd->Fd() != -1) FD_SET(ServerFd->Fd(), &rfds); // Add the file auto FileFD = MethodFd::FromFd(-1); if (Req.File.IsOpen()) FileFD = MethodFd::FromFd(Req.File.Fd()); if (In.WriteSpace() == true && ToFile == true && FileFD->Fd() != -1) FD_SET(FileFD->Fd(), &wfds); // Add stdin if (Owner->ConfigFindB("DependOnSTDIN", true) == true) FD_SET(STDIN_FILENO,&rfds); // Figure out the max fd int MaxFd = FileFD->Fd(); if (MaxFd < ServerFd->Fd()) MaxFd = ServerFd->Fd(); // 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 ResultState::SUCCESSFUL; _error->Errno("select", _("Select failed")); return ResultState::TRANSIENT_ERROR; } if (Res == 0) { _error->Error(_("Connection timed out")); return Die(Req); } // Handle server IO if (ServerFd->Fd() != -1 && FD_ISSET(ServerFd->Fd(), &rfds)) { errno = 0; if (In.Read(ServerFd) == false) return Die(Req); } if (ServerFd->Fd() != -1 && FD_ISSET(ServerFd->Fd(), &wfds)) { errno = 0; if (Out.Write(ServerFd) == false) return Die(Req); } // Send data to the file if (FileFD->Fd() != -1 && FD_ISSET(FileFD->Fd(), &wfds)) { if (In.Write(FileFD) == false) { _error->Errno("write", _("Error writing to output file")); return ResultState::TRANSIENT_ERROR; } } if (Req.MaximumSize > 0 && Req.File.IsOpen() && Req.File.Failed() == false && Req.File.Tell() > Req.MaximumSize) { Owner->SetFailReason("MaximumSizeExceeded"); _error->Error(_("File has unexpected size (%llu != %llu). Mirror sync in progress?"), Req.File.Tell(), Req.MaximumSize); return ResultState::FATAL_ERROR; } // Handle commands from APT if (FD_ISSET(STDIN_FILENO,&rfds)) { if (Owner->Run(true) != -1) exit(100); } return ResultState::SUCCESSFUL; } /*}}}*/ // HttpMethod::SendReq - Send the HTTP request /*{{{*/ // --------------------------------------------------------------------- /* This places the http request in the outbound buffer */ void HttpMethod::SendReq(FetchItem *Itm) { URI Uri = Itm->Uri; { auto const plus = Binary.find('+'); if (plus != std::string::npos) Uri.Access = Binary.substr(plus + 1); } // 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.Access != "http" && Server->Proxy.Access != "https") || APT::String::Endswith(Uri.Access, "https") || Server->Proxy.empty() == true || Server->Proxy.Host.empty()) requesturi = Uri.Path; else requesturi = 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 (ConfigFindB("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(ConfigFindI("Max-Age", 0)) << "\r\n"; else if (ConfigFindB("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 (ConfigFindB("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 (Server->RangesAllowed && 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, false) << "\r\n"; else if (Itm->LastModified != 0) Req << "If-Modified-Since: " << TimeRFC1123(Itm->LastModified, false).c_str() << "\r\n"; if ((Server->Proxy.Access == "http" || Server->Proxy.Access == "https") && (Server->Proxy.User.empty() == false || Server->Proxy.Password.empty() == false)) Req << "Proxy-Authorization: Basic " << Base64Encode(Server->Proxy.User + ":" + Server->Proxy.Password) << "\r\n"; MaybeAddAuthTo(Uri); if (Uri.User.empty() == false || Uri.Password.empty() == false) Req << "Authorization: Basic " << Base64Encode(Uri.User + ":" + Uri.Password) << "\r\n"; Req << "User-Agent: " << ConfigFind("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()); } /*}}}*/ std::unique_ptr<ServerState> HttpMethod::CreateServerState(URI const &uri)/*{{{*/ { return std::unique_ptr<ServerState>(new HttpServerState(uri, this)); } /*}}}*/ void HttpMethod::RotateDNS() /*{{{*/ { ::RotateDNS(); } /*}}}*/ BaseHttpMethod::DealWithHeadersResult HttpMethod::DealWithHeaders(FetchResult &Res, RequestState &Req)/*{{{*/ { auto ret = BaseHttpMethod::DealWithHeaders(Res, Req); if (ret != BaseHttpMethod::FILE_IS_OPEN) return ret; if (Req.File.Open(Queue->DestFile, FileFd::WriteAny) == false) return ERROR_NOT_FROM_SERVER; FailFile = Queue->DestFile; FailFile.c_str(); // Make sure we don't do a malloc in the signal handler FailFd = Req.File.Fd(); FailTime = Req.Date; if (Server->InitHashes(Queue->ExpectedHashes) == false || Req.AddPartialFileToHashes(Req.File) == false) { _error->Errno("read",_("Problem hashing file")); return ERROR_NOT_FROM_SERVER; } if (Req.StartPos > 0) Res.ResumePoint = Req.StartPos; SetNonBlock(Req.File.Fd(),true); return FILE_IS_OPEN; } /*}}}*/ HttpMethod::HttpMethod(std::string &&pProg) : BaseHttpMethod(std::move(pProg), "1.2", Pipeline | SendConfig) /*{{{*/ { SeccompFlags = aptMethod::BASE | aptMethod::NETWORK; auto addName = std::inserter(methodNames, methodNames.begin()); if (Binary != "http") addName = "http"; auto const plus = Binary.find('+'); if (plus != std::string::npos) { auto name2 = Binary.substr(plus + 1); if (std::find(methodNames.begin(), methodNames.end(), name2) == methodNames.end()) addName = std::move(name2); addName = Binary.substr(0, plus); } } /*}}}*/ int main(int, const char *argv[]) { // ignore SIGPIPE, this can happen on write() if the socket // closes the connection (this is dealt with via ServerDie()) signal(SIGPIPE, SIG_IGN); std::string Binary = flNotDir(argv[0]); if (Binary.find('+') == std::string::npos && Binary != "https" && Binary != "http") Binary.append("+http"); return HttpMethod(std::move(Binary)).Loop(); }