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-rw-r--r--apt-pkg/deb/debfile.cc250
-rw-r--r--apt-pkg/deb/debfile.h95
2 files changed, 345 insertions, 0 deletions
diff --git a/apt-pkg/deb/debfile.cc b/apt-pkg/deb/debfile.cc
new file mode 100644
index 000000000..f8d752e7f
--- /dev/null
+++ b/apt-pkg/deb/debfile.cc
@@ -0,0 +1,250 @@
+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ Debian Archive File (.deb)
+
+ .DEB archives are AR files containing two tars and an empty marker
+ member called 'debian-binary'. The two tars contain the meta data and
+ the actual archive contents. Thus this class is a very simple wrapper
+ around ar/tar to simply extract the right tar files.
+
+ It also uses the deb package list parser to parse the control file
+ into the cache.
+
+ ##################################################################### */
+ /*}}}*/
+// Include Files /*{{{*/
+#include <config.h>
+
+#include <apt-pkg/aptconfiguration.h>
+#include <apt-pkg/arfile.h>
+#include <apt-pkg/debfile.h>
+#include <apt-pkg/dirstream.h>
+#include <apt-pkg/error.h>
+#include <apt-pkg/extracttar.h>
+#include <apt-pkg/fileutl.h>
+#include <apt-pkg/tagfile.h>
+
+#include <string>
+#include <vector>
+#include <string.h>
+#include <sys/stat.h>
+
+#include <apti18n.h>
+ /*}}}*/
+
+// DebFile::debDebFile - Constructor /*{{{*/
+// ---------------------------------------------------------------------
+/* Open the AR file and check for consistency */
+debDebFile::debDebFile(FileFd &File) : File(File), AR(File)
+{
+ if (_error->PendingError() == true)
+ return;
+
+ if (!CheckMember("debian-binary")) {
+ _error->Error(_("This is not a valid DEB archive, missing '%s' member"), "debian-binary");
+ return;
+ }
+
+ if (!CheckMember("control.tar") &&
+ !CheckMember("control.tar.gz") &&
+ !CheckMember("control.tar.xz") &&
+ !CheckMember("control.tar.zst"))
+ {
+ _error->Error(_("This is not a valid DEB archive, missing '%s' member"), "control.tar");
+ return;
+ }
+
+ if (!CheckMember("data.tar") &&
+ !CheckMember("data.tar.gz") &&
+ !CheckMember("data.tar.bz2") &&
+ !CheckMember("data.tar.lzma") &&
+ !CheckMember("data.tar.xz") &&
+ !CheckMember("data.tar.zst"))
+ {
+ _error->Error(_("This is not a valid DEB archive, missing '%s' member"), "data.tar");
+ return;
+ }
+}
+ /*}}}*/
+// DebFile::CheckMember - Check if a named member is in the archive /*{{{*/
+// ---------------------------------------------------------------------
+/* This is used to check for a correct deb and to give nicer error messages
+ for people playing around. */
+bool debDebFile::CheckMember(const char *Name)
+{
+ if (AR.FindMember(Name) == 0)
+ return false;
+ return true;
+}
+ /*}}}*/
+// DebFile::GotoMember - Jump to a Member /*{{{*/
+// ---------------------------------------------------------------------
+/* Jump in the file to the start of a named member and return the information
+ about that member. The caller can then read from the file up to the
+ returned size. Note, since this relies on the file position this is
+ a destructive operation, it also changes the last returned Member
+ structure - so don't nest them! */
+const ARArchive::Member *debDebFile::GotoMember(const char *Name)
+{
+ // Get the archive member and positition the file
+ const ARArchive::Member *Member = AR.FindMember(Name);
+ if (Member == 0)
+ {
+ return 0;
+ }
+ if (File.Seek(Member->Start) == false)
+ return 0;
+
+ return Member;
+}
+ /*}}}*/
+// DebFile::ExtractTarMember - Extract the contents of a tar member /*{{{*/
+// ---------------------------------------------------------------------
+/* Simple wrapper around tar.. */
+bool debDebFile::ExtractTarMember(pkgDirStream &Stream,const char *Name)
+{
+ // Get the archive member
+ const ARArchive::Member *Member = NULL;
+ std::string Compressor;
+
+ std::vector<APT::Configuration::Compressor> compressor = APT::Configuration::getCompressors();
+ for (std::vector<APT::Configuration::Compressor>::const_iterator c = compressor.begin();
+ c != compressor.end(); ++c)
+ {
+ Member = AR.FindMember(std::string(Name).append(c->Extension).c_str());
+ if (Member == NULL)
+ continue;
+ Compressor = c->Name;
+ break;
+ }
+
+ if (Member == NULL)
+ Member = AR.FindMember(std::string(Name).c_str());
+
+ if (Member == NULL)
+ {
+ std::string ext = std::string(Name) + ".{";
+ for (std::vector<APT::Configuration::Compressor>::const_iterator c = compressor.begin();
+ c != compressor.end(); ++c) {
+ if (!c->Extension.empty())
+ ext.append(c->Extension.substr(1));
+ }
+ ext.append("}");
+ return _error->Error(_("Internal error, could not locate member %s"), ext.c_str());
+ }
+
+ if (File.Seek(Member->Start) == false)
+ return false;
+
+ // Prepare Tar
+ ExtractTar Tar(File,Member->Size,Compressor);
+ if (_error->PendingError() == true)
+ return false;
+ return Tar.Go(Stream);
+}
+ /*}}}*/
+// DebFile::ExtractArchive - Extract the archive data itself /*{{{*/
+// ---------------------------------------------------------------------
+/* Simple wrapper around DebFile::ExtractTarMember. */
+bool debDebFile::ExtractArchive(pkgDirStream &Stream)
+{
+ return ExtractTarMember(Stream, "data.tar");
+}
+ /*}}}*/
+
+// DebFile::ControlExtract::DoItem - Control Tar Extraction /*{{{*/
+// ---------------------------------------------------------------------
+/* This directory stream handler for the control tar handles extracting
+ it into the temporary meta directory. It only extracts files, it does
+ not create directories, links or anything else. */
+bool debDebFile::ControlExtract::DoItem(Item &Itm,int &Fd)
+{
+ if (Itm.Type != Item::File)
+ return true;
+
+ /* Cleanse the file name, prevent people from trying to unpack into
+ absolute paths, .., etc */
+ for (char *I = Itm.Name; *I != 0; I++)
+ if (*I == '/')
+ *I = '_';
+
+ /* Force the ownership to be root and ensure correct permissions,
+ go-w, the rest are left untouched */
+ Itm.UID = 0;
+ Itm.GID = 0;
+ Itm.Mode &= ~(S_IWGRP | S_IWOTH);
+
+ return pkgDirStream::DoItem(Itm,Fd);
+}
+ /*}}}*/
+
+// MemControlExtract::DoItem - Check if it is the control file /*{{{*/
+// ---------------------------------------------------------------------
+/* This sets up to extract the control block member file into a memory
+ block of just the right size. All other files go into the bit bucket. */
+bool debDebFile::MemControlExtract::DoItem(Item &Itm,int &Fd)
+{
+ // At the control file, allocate buffer memory.
+ if (Member == Itm.Name)
+ {
+ delete [] Control;
+ Control = new char[Itm.Size+2];
+ IsControl = true;
+ Fd = -2; // Signal to pass to Process
+ Length = Itm.Size;
+ }
+ else
+ IsControl = false;
+
+ return true;
+}
+ /*}}}*/
+// MemControlExtract::Process - Process extracting the control file /*{{{*/
+// ---------------------------------------------------------------------
+/* Just memcopy the block from the tar extractor and put it in the right
+ place in the pre-allocated memory block. */
+bool debDebFile::MemControlExtract::Process(Item &/*Itm*/,const unsigned char *Data,
+ unsigned long long Size,unsigned long long Pos)
+{
+ memcpy(Control + Pos, Data,Size);
+ return true;
+}
+ /*}}}*/
+// MemControlExtract::Read - Read the control information from the deb /*{{{*/
+// ---------------------------------------------------------------------
+/* This uses the internal tar extractor to fetch the control file, and then
+ it parses it into a tag section parser. */
+bool debDebFile::MemControlExtract::Read(debDebFile &Deb)
+{
+ if (Deb.ExtractTarMember(*this, "control.tar") == false)
+ return false;
+
+ if (Control == 0)
+ return true;
+
+ Control[Length] = '\n';
+ Control[Length+1] = '\n';
+ if (Section.Scan(Control,Length+2) == false)
+ return _error->Error(_("Unparsable control file"));
+ return true;
+}
+ /*}}}*/
+// MemControlExtract::TakeControl - Parse a memory block /*{{{*/
+// ---------------------------------------------------------------------
+/* The given memory block is loaded into the parser and parsed as a control
+ record. */
+bool debDebFile::MemControlExtract::TakeControl(const void *Data,unsigned long long Size)
+{
+ delete [] Control;
+ Control = new char[Size+2];
+ Length = Size;
+ memcpy(Control,Data,Size);
+
+ Control[Length] = '\n';
+ Control[Length+1] = '\n';
+ return Section.Scan(Control,Length+2);
+}
+ /*}}}*/
+
diff --git a/apt-pkg/deb/debfile.h b/apt-pkg/deb/debfile.h
new file mode 100644
index 000000000..21c59a567
--- /dev/null
+++ b/apt-pkg/deb/debfile.h
@@ -0,0 +1,95 @@
+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ Debian Archive File (.deb)
+
+ This Class handles all the operations performed directly on .deb
+ files. It makes use of the AR and TAR classes to give the necessary
+ external interface.
+
+ There are only two things that can be done with a raw package,
+ extract it's control information and extract the contents itself.
+
+ This should probably subclass an as-yet unwritten super class to
+ produce a generic archive mechanism.
+
+ The memory control file extractor is useful to extract a single file
+ into memory from the control.tar.gz
+
+ ##################################################################### */
+ /*}}}*/
+#ifndef PKGLIB_DEBFILE_H
+#define PKGLIB_DEBFILE_H
+
+#include <apt-pkg/arfile.h>
+#include <apt-pkg/dirstream.h>
+#include <apt-pkg/macros.h>
+#include <apt-pkg/tagfile.h>
+
+#include <string>
+
+#ifndef APT_8_CLEANER_HEADERS
+#include <apt-pkg/md5.h>
+#endif
+#ifndef APT_10_CLEANER_HEADERS
+#include <apt-pkg/pkgcache.h>
+#endif
+
+class FileFd;
+
+class debDebFile
+{
+ protected:
+
+ FileFd &File;
+ ARArchive AR;
+
+ bool CheckMember(const char *Name);
+
+ public:
+ class ControlExtract;
+ class MemControlExtract;
+
+ bool ExtractTarMember(pkgDirStream &Stream, const char *Name);
+ bool ExtractArchive(pkgDirStream &Stream);
+ const ARArchive::Member *GotoMember(const char *Name);
+ inline FileFd &GetFile() {return File;};
+
+ explicit debDebFile(FileFd &File);
+};
+
+class debDebFile::ControlExtract : public pkgDirStream
+{
+ public:
+
+ virtual bool DoItem(Item &Itm,int &Fd) APT_OVERRIDE;
+};
+
+class debDebFile::MemControlExtract : public pkgDirStream
+{
+ bool IsControl;
+
+ public:
+
+ char *Control;
+ pkgTagSection Section;
+ unsigned long Length;
+ std::string Member;
+
+ // Members from DirStream
+ virtual bool DoItem(Item &Itm,int &Fd) APT_OVERRIDE;
+ virtual bool Process(Item &Itm,const unsigned char *Data,
+ unsigned long long Size,unsigned long long Pos) APT_OVERRIDE;
+
+ // Helpers
+ bool Read(debDebFile &Deb);
+ bool TakeControl(const void *Data,unsigned long long Size);
+
+ MemControlExtract() : IsControl(false), Control(0), Length(0), Member("control") {};
+ explicit MemControlExtract(std::string Member) : IsControl(false), Control(0), Length(0), Member(Member) {};
+ ~MemControlExtract() {delete [] Control;};
+};
+ /*}}}*/
+
+#endif
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