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-rw-r--r--apt-inst/contrib/extracttar.cc306
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-// -*- mode: cpp; mode: fold -*-
-// Description /*{{{*/
-/* ######################################################################
-
- Extract a Tar - Tar Extractor
-
- Some performance measurements showed that zlib performed quite poorly
- in comparison to a forked gzip process. This tar extractor makes use
- of the fact that dup'd file descriptors have the same seek pointer
- and that gzip will not read past the end of a compressed stream,
- even if there is more data. We use the dup property to track extraction
- progress and the gzip feature to just feed gzip a fd in the middle
- of an AR file.
-
- ##################################################################### */
- /*}}}*/
-// Include Files /*{{{*/
-#include <config.h>
-
-#include <apt-pkg/configuration.h>
-#include <apt-pkg/dirstream.h>
-#include <apt-pkg/error.h>
-#include <apt-pkg/extracttar.h>
-#include <apt-pkg/fileutl.h>
-#include <apt-pkg/strutl.h>
-
-#include <algorithm>
-#include <iostream>
-#include <string>
-#include <fcntl.h>
-#include <signal.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <apti18n.h>
- /*}}}*/
-
-using namespace std;
-
-// The on disk header for a tar file.
-struct ExtractTar::TarHeader
-{
- char Name[100];
- char Mode[8];
- char UserID[8];
- char GroupID[8];
- char Size[12];
- char MTime[12];
- char Checksum[8];
- char LinkFlag;
- char LinkName[100];
- char MagicNumber[8];
- char UserName[32];
- char GroupName[32];
- char Major[8];
- char Minor[8];
-};
-
-// ExtractTar::ExtractTar - Constructor /*{{{*/
-// ---------------------------------------------------------------------
-/* */
-ExtractTar::ExtractTar(FileFd &Fd,unsigned long long Max,string DecompressionProgram)
- : File(Fd), MaxInSize(Max), DecompressProg(DecompressionProgram)
-{
- GZPid = -1;
- Eof = false;
-}
- /*}}}*/
-// ExtractTar::ExtractTar - Destructor /*{{{*/
-// ---------------------------------------------------------------------
-/* */
-ExtractTar::~ExtractTar()
-{
- // Error close
- Done();
-}
- /*}}}*/
-// ExtractTar::Done - Reap the gzip sub process /*{{{*/
-bool ExtractTar::Done()
-{
- return InFd.Close();
-}
- /*}}}*/
-// ExtractTar::StartGzip - Startup gzip /*{{{*/
-// ---------------------------------------------------------------------
-/* This creates a gzip sub process that has its input as the file itself.
- If this tar file is embedded into something like an ar file then
- gzip will efficiently ignore the extra bits. */
-bool ExtractTar::StartGzip()
-{
- if (DecompressProg.empty())
- {
- InFd.OpenDescriptor(File.Fd(), FileFd::ReadOnly, FileFd::None, false);
- return true;
- }
-
- std::vector<APT::Configuration::Compressor> const compressors = APT::Configuration::getCompressors();
- std::vector<APT::Configuration::Compressor>::const_iterator compressor = compressors.begin();
- for (; compressor != compressors.end(); ++compressor) {
- if (compressor->Name == DecompressProg) {
- return InFd.OpenDescriptor(File.Fd(), FileFd::ReadOnly, *compressor, false);
- }
- }
-
- return _error->Error(_("Cannot find a configured compressor for '%s'"),
- DecompressProg.c_str());
-
-}
- /*}}}*/
-// ExtractTar::Go - Perform extraction /*{{{*/
-// ---------------------------------------------------------------------
-/* This reads each 512 byte block from the archive and extracts the header
- information into the Item structure. Then it resolves the UID/GID and
- invokes the correct processing function. */
-bool ExtractTar::Go(pkgDirStream &Stream)
-{
- if (StartGzip() == false)
- return false;
-
- // Loop over all blocks
- string LastLongLink, ItemLink;
- string LastLongName, ItemName;
- while (1)
- {
- bool BadRecord = false;
- unsigned char Block[512];
- if (InFd.Read(Block,sizeof(Block),true) == false)
- return false;
-
- if (InFd.Eof() == true)
- break;
-
- // Get the checksum
- TarHeader *Tar = (TarHeader *)Block;
- unsigned long CheckSum;
- if (StrToNum(Tar->Checksum,CheckSum,sizeof(Tar->Checksum),8) == false)
- return _error->Error(_("Corrupted archive"));
-
- /* Compute the checksum field. The actual checksum is blanked out
- with spaces so it is not included in the computation */
- unsigned long NewSum = 0;
- memset(Tar->Checksum,' ',sizeof(Tar->Checksum));
- for (int I = 0; I != sizeof(Block); I++)
- NewSum += Block[I];
-
- /* Check for a block of nulls - in this case we kill gzip, GNU tar
- does this.. */
- if (NewSum == ' '*sizeof(Tar->Checksum))
- return Done();
-
- if (NewSum != CheckSum)
- return _error->Error(_("Tar checksum failed, archive corrupted"));
-
- // Decode all of the fields
- pkgDirStream::Item Itm;
- if (StrToNum(Tar->Mode,Itm.Mode,sizeof(Tar->Mode),8) == false ||
- (Base256ToNum(Tar->UserID,Itm.UID,8) == false &&
- StrToNum(Tar->UserID,Itm.UID,sizeof(Tar->UserID),8) == false) ||
- (Base256ToNum(Tar->GroupID,Itm.GID,8) == false &&
- StrToNum(Tar->GroupID,Itm.GID,sizeof(Tar->GroupID),8) == false) ||
- (Base256ToNum(Tar->Size,Itm.Size,12) == false &&
- StrToNum(Tar->Size,Itm.Size,sizeof(Tar->Size),8) == false) ||
- (Base256ToNum(Tar->MTime,Itm.MTime,12) == false &&
- StrToNum(Tar->MTime,Itm.MTime,sizeof(Tar->MTime),8) == false) ||
- StrToNum(Tar->Major,Itm.Major,sizeof(Tar->Major),8) == false ||
- StrToNum(Tar->Minor,Itm.Minor,sizeof(Tar->Minor),8) == false)
- return _error->Error(_("Corrupted archive"));
-
- // Grab the filename and link target: use last long name if one was
- // set, otherwise use the header value as-is, but remember that it may
- // fill the entire 100-byte block and needs to be zero-terminated.
- // See Debian Bug #689582.
- if (LastLongName.empty() == false)
- Itm.Name = (char *)LastLongName.c_str();
- else
- Itm.Name = (char *)ItemName.assign(Tar->Name, sizeof(Tar->Name)).c_str();
- if (Itm.Name[0] == '.' && Itm.Name[1] == '/' && Itm.Name[2] != 0)
- Itm.Name += 2;
-
- if (LastLongLink.empty() == false)
- Itm.LinkTarget = (char *)LastLongLink.c_str();
- else
- Itm.LinkTarget = (char *)ItemLink.assign(Tar->LinkName, sizeof(Tar->LinkName)).c_str();
-
- // Convert the type over
- switch (Tar->LinkFlag)
- {
- case NormalFile0:
- case NormalFile:
- Itm.Type = pkgDirStream::Item::File;
- break;
-
- case HardLink:
- Itm.Type = pkgDirStream::Item::HardLink;
- break;
-
- case SymbolicLink:
- Itm.Type = pkgDirStream::Item::SymbolicLink;
- break;
-
- case CharacterDevice:
- Itm.Type = pkgDirStream::Item::CharDevice;
- break;
-
- case BlockDevice:
- Itm.Type = pkgDirStream::Item::BlockDevice;
- break;
-
- case Directory:
- Itm.Type = pkgDirStream::Item::Directory;
- break;
-
- case FIFO:
- Itm.Type = pkgDirStream::Item::FIFO;
- break;
-
- case GNU_LongLink:
- {
- unsigned long long Length = Itm.Size;
- unsigned char Block[512];
- while (Length > 0)
- {
- if (InFd.Read(Block,sizeof(Block),true) == false)
- return false;
- if (Length <= sizeof(Block))
- {
- LastLongLink.append(Block,Block+sizeof(Block));
- break;
- }
- LastLongLink.append(Block,Block+sizeof(Block));
- Length -= sizeof(Block);
- }
- continue;
- }
-
- case GNU_LongName:
- {
- unsigned long long Length = Itm.Size;
- unsigned char Block[512];
- while (Length > 0)
- {
- if (InFd.Read(Block,sizeof(Block),true) == false)
- return false;
- if (Length < sizeof(Block))
- {
- LastLongName.append(Block,Block+sizeof(Block));
- break;
- }
- LastLongName.append(Block,Block+sizeof(Block));
- Length -= sizeof(Block);
- }
- continue;
- }
-
- default:
- BadRecord = true;
- _error->Warning(_("Unknown TAR header type %u, member %s"),(unsigned)Tar->LinkFlag,Tar->Name);
- break;
- }
-
- int Fd = -1;
- if (BadRecord == false)
- if (Stream.DoItem(Itm,Fd) == false)
- return false;
-
- // Copy the file over the FD
- unsigned long long Size = Itm.Size;
- while (Size != 0)
- {
- unsigned char Junk[32*1024];
- unsigned long Read = min(Size, (unsigned long long)sizeof(Junk));
- if (InFd.Read(Junk,((Read+511)/512)*512) == false)
- return false;
-
- if (BadRecord == false)
- {
- if (Fd > 0)
- {
- if (write(Fd,Junk,Read) != (signed)Read)
- return Stream.Fail(Itm,Fd);
- }
- else
- {
- /* An Fd of -2 means to send to a special processing
- function */
- if (Fd == -2)
- if (Stream.Process(Itm,Junk,Read,Itm.Size - Size) == false)
- return Stream.Fail(Itm,Fd);
- }
- }
-
- Size -= Read;
- }
-
- // And finish up
- if (BadRecord == false)
- if (Stream.FinishedFile(Itm,Fd) == false)
- return false;
-
- LastLongName.erase();
- LastLongLink.erase();
- }
-
- return Done();
-}
- /*}}}*/
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