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+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ 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/string_view.h>
+#include <apt-pkg/strutl.h>
+
+#include <cerrno>
+#include <chrono>
+#include <csignal>
+#include <cstddef>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <iostream>
+#include <sstream>
+#include <arpa/inet.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>
+
+#ifdef HAVE_SYSTEMD
+#include <systemd/sd-login.h>
+#endif
+ /*}}}*/
+using namespace std;
+
+unsigned long long CircleBuf::BwReadLimit=0;
+unsigned long long CircleBuf::BwTickReadData=0;
+std::chrono::steady_clock::duration CircleBuf::BwReadTick{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)
+{
+ size_t ReadThisCycle = 0;
+ 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) {
+ auto const now = std::chrono::steady_clock::now().time_since_epoch();
+ auto const d = now - CircleBuf::BwReadTick;
+
+ auto const tickLen = std::chrono::microseconds(std::chrono::seconds(1)) / BW_HZ;
+ if(d > tickLen) {
+ CircleBuf::BwReadTick = now;
+ CircleBuf::BwTickReadData = 0;
+ }
+
+ if(CircleBuf::BwTickReadData >= BwReadMax) {
+ usleep(tickLen.count());
+ 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 ReadThisCycle != 0;
+ if (Res < 0)
+ {
+ if (errno == EAGAIN)
+ return true;
+ return false;
+ }
+
+ InP += Res;
+ ReadThisCycle += 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)
+ {
+ 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::~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 = '[' + Host + ']';
+ else
+ ProperHost = 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(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())
+ {
+ 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())
+ {
+ 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())
+ {
+ // 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, APT_BUFFER_SIZE), 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", 30), 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")
+ {
+ aptConfigWrapperForMethods ProxyConf{std::vector<std::string>{"http", "https"}};
+ ProxyConf.setPostfixForMethodNames(Proxy.Host.c_str());
+ result = UnwrapTLS(Proxy.Host, ServerFd, TimeOut, Owner, &ProxyConf);
+ 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", 30), Owner);
+ if (result != ResultState::SUCCESSFUL)
+ return result;
+ }
+ }
+
+ if (tls)
+ return UnwrapTLS(ServerName.Host, ServerFd, TimeOut, Owner, 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;
+
+ Close();
+
+ switch (Req.State)
+ {
+ case RequestState::Data:
+ // We have read all data we could, or the connection is not persistent
+ if (In.IsLimit() == true || Persistent == false)
+ return ResultState::SUCCESSFUL;
+ break;
+ case RequestState::Header:
+ In.Limit(-1);
+ // We have read some headers, but we might also have read the content
+ // and an EOF and hence reached this point. This is fine.
+ if (In.WriteSpace())
+ return ResultState::SUCCESSFUL;
+ break;
+ }
+
+ // We have reached an actual error, tell the user about it.
+ 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;
+}
+ /*}}}*/
+// 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, bool MustComplete)
+{
+ if (File != nullptr)
+ {
+ 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 || not MustComplete)
+ 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;
+
+ // Record if we have data pending to read in the server, so that we can
+ // skip the wait in select(). This can happen if data has already been
+ // read into a methodfd's buffer - the TCP queue might be empty at that
+ // point.
+ bool ServerPending = ServerFd->HasPending();
+
+ 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. Note that we need to add the file to the select and
+ // then write before we read from the server so we do not have content
+ // left to write if the server closes the connection when we read from it.
+ //
+ // An alternative would be to just flush the file in those circumstances
+ // and then return. Because otherwise we might end up blocking indefinitely
+ // in the select() call if we were to continue but all that was left to do
+ // was write to the local file.
+ if (In.WriteSpace() == true && ToFile == true && Req.File.IsOpen())
+ FD_SET(Req.File.Fd(), &wfds);
+
+ // Add stdin
+ if (Owner->ConfigFindB("DependOnSTDIN", true) == true)
+ FD_SET(STDIN_FILENO,&rfds);
+
+ // Figure out the max fd
+ int MaxFd = Req.File.Fd();
+ if (MaxFd < ServerFd->Fd())
+ MaxFd = ServerFd->Fd();
+
+ // Select
+ struct timeval tv;
+ tv.tv_sec = ServerPending ? 0 : 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 && not ServerPending)
+ {
+ _error->Error(_("Connection timed out"));
+ return ResultState::TRANSIENT_ERROR;
+ }
+
+ // Flush any data before talking to the server, in case the server
+ // closed the connection, we want to be done writing.
+ if (Req.File.IsOpen() && FD_ISSET(Req.File.Fd(), &wfds))
+ {
+ if (not Flush(&Req.File, false))
+ return ResultState::TRANSIENT_ERROR;
+ }
+
+ // Handle server IO
+ if (ServerPending || (ServerFd->Fd() != -1 && FD_ISSET(ServerFd->Fd(), &rfds)))
+ {
+ errno = 0;
+ if (In.Read(ServerFd) == false)
+ return Die(Req);
+ }
+
+ // Send data to the file
+ if (In.WriteSpace() == true && ToFile == true && Req.File.IsOpen())
+ {
+ if (not Flush(&Req.File, false))
+ return ResultState::TRANSIENT_ERROR;
+ }
+
+ if (ServerFd->Fd() != -1 && FD_ISSET(ServerFd->Fd(), &wfds))
+ {
+ errno = 0;
+ if (Out.Write(ServerFd) == false)
+ return Die(Req);
+ }
+
+ 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;
+
+ if (not _config->FindB("Acquire::Send-URI-Encoded", false))
+ requesturi = URIEncode(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 ")");
+
+#ifdef HAVE_SYSTEMD
+ if (ConfigFindB("User-Agent-Non-Interactive", false))
+ {
+ using APT::operator""_sv;
+ char *unit = nullptr;
+ sd_pid_get_unit(getpid(), &unit);
+ if (unit != nullptr && *unit != '\0' && not APT::String::Startswith(unit, "user@") // user@ _is_ interactive
+ && "packagekit.service"_sv != unit // packagekit likely is interactive
+ && "dbus.service"_sv != unit) // aptdaemon and qapt don't have systemd services
+ Req << " non-interactive";
+
+ free(unit);
+ }
+#endif
+
+ Req << "\r\n";
+
+ // the famously typoed HTTP header field
+ auto const referrer = ConfigFind("Referer", "");
+ if (referrer.empty() == false)
+ Req << "Referer: " << referrer << "\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;
+ (void)(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;
+
+ return FILE_IS_OPEN;
+}
+ /*}}}*/
+HttpMethod::HttpMethod(std::string &&pProg) : BaseHttpMethod(std::move(pProg), "1.2", Pipeline | SendConfig | SendURIEncoded) /*{{{*/
+{
+ 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();
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-15 07:45:49 +0000