path: root/apt-pkg/indexcopy.cc

// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
// $Id: indexcopy.cc,v 1.10 2002/03/26 07:38:58 jgg Exp $
/* ######################################################################

   Index Copying - Aid for copying and verifying the index files
   
   This class helps apt-cache reconstruct a damaged index files. 
   
   ##################################################################### */
									/*}}}*/
// Include Files							/*{{{*/
#include "indexcopy.h"

#include <apt-pkg/error.h>
#include <apt-pkg/progress.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/tagfile.h>
#include <apt-pkg/indexrecords.h>
#include <apt-pkg/md5.h>
#include <apt-pkg/cdrom.h>
#include <apti18n.h>

#include <iostream>
#include <sstream>
#include <unistd.h>
#include <sys/stat.h>
#include <stdio.h>
									/*}}}*/

using namespace std;

// IndexCopy::CopyPackages - Copy the package files from the CD		/*{{{*/
// ---------------------------------------------------------------------
/* */
bool IndexCopy::CopyPackages(string CDROM,string Name,vector<string> &List,
			     pkgCdromStatus *log)
{
   OpProgress *Progress = NULL;
   if (List.size() == 0)
      return true;
   
   if(log) 
      Progress = log->GetOpProgress();
   
   bool NoStat = _config->FindB("APT::CDROM::Fast",false);
   bool Debug = _config->FindB("Debug::aptcdrom",false);
   
   // Prepare the progress indicator
   unsigned long TotalSize = 0;
   for (vector<string>::iterator I = List.begin(); I != List.end(); I++)
   {
      struct stat Buf;
      if (stat(string(*I + GetFileName()).c_str(),&Buf) != 0 &&
	  stat(string(*I + GetFileName() + ".gz").c_str(),&Buf) != 0)
	 return _error->Errno("stat","Stat failed for %s",
			      string(*I + GetFileName()).c_str());
      TotalSize += Buf.st_size;
   }	

   unsigned long CurrentSize = 0;
   unsigned int NotFound = 0;
   unsigned int WrongSize = 0;
   unsigned int Packages = 0;
   for (vector<string>::iterator I = List.begin(); I != List.end(); I++)
   {      
      string OrigPath = string(*I,CDROM.length());
      unsigned long FileSize = 0;
      
      // Open the package file
      FileFd Pkg;
      if (FileExists(*I + GetFileName()) == true)
      {
	 Pkg.Open(*I + GetFileName(),FileFd::ReadOnly);
	 FileSize = Pkg.Size();
      }      
      else
      {
	 FileFd From(*I + GetFileName() + ".gz",FileFd::ReadOnly);
	 if (_error->PendingError() == true)
	    return false;
	 FileSize = From.Size();
	 
	 // Get a temp file
	 FILE *tmp = tmpfile();
	 if (tmp == 0)
	    return _error->Errno("tmpfile","Unable to create a tmp file");
	 Pkg.Fd(dup(fileno(tmp)));
	 fclose(tmp);
	 
	 // Fork gzip
	 pid_t Process = fork();
	 if (Process < 0)
	    return _error->Errno("fork","Couldn't fork gzip");
	 
	 // The child
	 if (Process == 0)
	 {	    
	    dup2(From.Fd(),STDIN_FILENO);
	    dup2(Pkg.Fd(),STDOUT_FILENO);
	    SetCloseExec(STDIN_FILENO,false);
	    SetCloseExec(STDOUT_FILENO,false);
	    
	    const char *Args[3];
	    string Tmp =  _config->Find("Dir::bin::gzip","gzip");
	    Args[0] = Tmp.c_str();
	    Args[1] = "-d";
	    Args[2] = 0;
	    execvp(Args[0],(char **)Args);
	    exit(100);
	 }
	 
	 // Wait for gzip to finish
	 if (ExecWait(Process,_config->Find("Dir::bin::gzip","gzip").c_str(),false) == false)
	    return _error->Error("gzip failed, perhaps the disk is full.");
	 
	 Pkg.Seek(0);
      }
      pkgTagFile Parser(&Pkg);
      if (_error->PendingError() == true)
	 return false;
      
      // Open the output file
      char S[400];
      snprintf(S,sizeof(S),"cdrom:[%s]/%s%s",Name.c_str(),
	       (*I).c_str() + CDROM.length(),GetFileName());
      string TargetF = _config->FindDir("Dir::State::lists") + "partial/";
      TargetF += URItoFileName(S);
      if (_config->FindB("APT::CDROM::NoAct",false) == true)
	 TargetF = "/dev/null";
      FileFd Target(TargetF,FileFd::WriteEmpty);
      FILE *TargetFl = fdopen(dup(Target.Fd()),"w");
      if (_error->PendingError() == true)
	 return false;
      if (TargetFl == 0)
	 return _error->Errno("fdopen","Failed to reopen fd");
      
      // Setup the progress meter
      if(Progress)
	 Progress->OverallProgress(CurrentSize,TotalSize,FileSize,
				   string("Reading ") + Type() + " Indexes");

      // Parse
      if(Progress)
	 Progress->SubProgress(Pkg.Size());
      pkgTagSection Section;
      this->Section = &Section;
      string Prefix;
      unsigned long Hits = 0;
      unsigned long Chop = 0;
      while (Parser.Step(Section) == true)
      {
	 if(Progress)
	    Progress->Progress(Parser.Offset());
	 string File;
	 unsigned long Size;
	 if (GetFile(File,Size) == false)
	 {
	    fclose(TargetFl);
	    return false;
	 }
	 
	 if (Chop != 0)
	    File = OrigPath + ChopDirs(File,Chop);
	 
	 // See if the file exists
	 bool Mangled = false;
	 if (NoStat == false || Hits < 10)
	 {
	    // Attempt to fix broken structure
	    if (Hits == 0)
	    {
	       if (ReconstructPrefix(Prefix,OrigPath,CDROM,File) == false &&
		   ReconstructChop(Chop,*I,File) == false)
	       {
		  if (Debug == true)
		     clog << "Missed: " << File << endl;
		  NotFound++;
		  continue;
	       }
	       if (Chop != 0)
		  File = OrigPath + ChopDirs(File,Chop);
	    }
	    
	    // Get the size
	    struct stat Buf;
	    if (stat(string(CDROM + Prefix + File).c_str(),&Buf) != 0 || 
		Buf.st_size == 0)
	    {
	       // Attempt to fix busted symlink support for one instance
	       string OrigFile = File;
	       string::size_type Start = File.find("binary-");
	       string::size_type End = File.find("/",Start+3);
	       if (Start != string::npos && End != string::npos)
	       {
		  File.replace(Start,End-Start,"binary-all");
		  Mangled = true;
	       }
	       
	       if (Mangled == false ||
		   stat(string(CDROM + Prefix + File).c_str(),&Buf) != 0)
	       {
		  if (Debug == true)
		     clog << "Missed(2): " << OrigFile << endl;
		  NotFound++;
		  continue;
	       }	       
	    }	    
	    			    	    
	    // Size match
	    if ((unsigned)Buf.st_size != Size)
	    {
	       if (Debug == true)
		  clog << "Wrong Size: " << File << endl;
	       WrongSize++;
	       continue;
	    }
	 }
	 
	 Packages++;
	 Hits++;
	 
	 if (RewriteEntry(TargetFl,File) == false)
	 {
	    fclose(TargetFl);
	    return false;
	 }
      }
      fclose(TargetFl);

      if (Debug == true)
	 cout << " Processed by using Prefix '" << Prefix << "' and chop " << Chop << endl;
	 
      if (_config->FindB("APT::CDROM::NoAct",false) == false)
      {
	 // Move out of the partial directory
	 Target.Close();
	 string FinalF = _config->FindDir("Dir::State::lists");
	 FinalF += URItoFileName(S);
	 if (rename(TargetF.c_str(),FinalF.c_str()) != 0)
	    return _error->Errno("rename","Failed to rename");
      }
	 
      /* Mangle the source to be in the proper notation with
       	 prefix dist [component] */ 
      *I = string(*I,Prefix.length());
      ConvertToSourceList(CDROM,*I);
      *I = Prefix + ' ' + *I;
      
      CurrentSize += FileSize;
   }   
   if(Progress)
      Progress->Done();
   
   // Some stats
   if(log) {
      stringstream msg;
      if(NotFound == 0 && WrongSize == 0)
	 ioprintf(msg, _("Wrote %i records.\n"), Packages);
      else if (NotFound != 0 && WrongSize == 0)
	 ioprintf(msg, _("Wrote %i records with %i missing files.\n"), 
		  Packages, NotFound);
      else if (NotFound == 0 && WrongSize != 0)
	 ioprintf(msg, _("Wrote %i records with %i mismatched files\n"), 
		  Packages, WrongSize);
      if (NotFound != 0 && WrongSize != 0)
	 ioprintf(msg, _("Wrote %i records with %i missing files and %i mismatched files\n"), Packages, NotFound, WrongSize);
   }
   
   if (Packages == 0)
      _error->Warning("No valid records were found.");

   if (NotFound + WrongSize > 10)
      _error->Warning("Alot of entries were discarded, something may be wrong.\n");
   

   return true;
}
									/*}}}*/
// IndexCopy::ChopDirs - Chop off the leading directory components	/*{{{*/
// ---------------------------------------------------------------------
/* */
string IndexCopy::ChopDirs(string Path,unsigned int Depth)
{
   string::size_type I = 0;
   do
   {
      I = Path.find('/',I+1);
      Depth--;
   }
   while (I != string::npos && Depth != 0);
   
   if (I == string::npos)
      return string();
   
   return string(Path,I+1);
}
									/*}}}*/
// IndexCopy::ReconstructPrefix - Fix strange prefixing			/*{{{*/
// ---------------------------------------------------------------------
/* This prepends dir components from the path to the package files to
   the path to the deb until it is found */
bool IndexCopy::ReconstructPrefix(string &Prefix,string OrigPath,string CD,
				  string File)
{
   bool Debug = _config->FindB("Debug::aptcdrom",false);
   unsigned int Depth = 1;
   string MyPrefix = Prefix;
   while (1)
   {
      struct stat Buf;
      if (stat(string(CD + MyPrefix + File).c_str(),&Buf) != 0)
      {
	 if (Debug == true)
	    cout << "Failed, " << CD + MyPrefix + File << endl;
	 if (GrabFirst(OrigPath,MyPrefix,Depth++) == true)
	    continue;
	 
	 return false;
      }
      else
      {
	 Prefix = MyPrefix;
	 return true;
      }      
   }
   return false;
}
									/*}}}*/
// IndexCopy::ReconstructChop - Fixes bad source paths			/*{{{*/
// ---------------------------------------------------------------------
/* This removes path components from the filename and prepends the location
   of the package files until a file is found */
bool IndexCopy::ReconstructChop(unsigned long &Chop,string Dir,string File)
{
   // Attempt to reconstruct the filename
   unsigned long Depth = 0;
   while (1)
   {
      struct stat Buf;
      if (stat(string(Dir + File).c_str(),&Buf) != 0)
      {
	 File = ChopDirs(File,1);
	 Depth++;
	 if (File.empty() == false)
	    continue;
	 return false;
      }
      else
      {
	 Chop = Depth;
	 return true;
      }
   }
   return false;
}
									/*}}}*/
// IndexCopy::ConvertToSourceList - Convert a Path to a sourcelist 	/*{{{*/
// ---------------------------------------------------------------------
/* We look for things in dists/ notation and convert them to 
   <dist> <component> form otherwise it is left alone. This also strips
   the CD path. 
 
   This implements a regex sort of like: 
    (.*)/dists/([^/]*)/(.*)/binary-* 
     ^          ^      ^- Component
     |          |-------- Distribution
     |------------------- Path
   
   It was deciced to use only a single word for dist (rather than say
   unstable/non-us) to increase the chance that each CD gets a single
   line in sources.list.
 */
void IndexCopy::ConvertToSourceList(string CD,string &Path)
{
   char S[300];
   snprintf(S,sizeof(S),"binary-%s",_config->Find("Apt::Architecture").c_str());
   
   // Strip the cdrom base path
   Path = string(Path,CD.length());
   if (Path.empty() == true)
      Path = "/";
   
   // Too short to be a dists/ type
   if (Path.length() < strlen("dists/"))
      return;
   
   // Not a dists type.
   if (stringcmp(Path.c_str(),Path.c_str()+strlen("dists/"),"dists/") != 0)
      return;
      
   // Isolate the dist
   string::size_type Slash = strlen("dists/");
   string::size_type Slash2 = Path.find('/',Slash + 1);
   if (Slash2 == string::npos || Slash2 + 2 >= Path.length())
      return;
   string Dist = string(Path,Slash,Slash2 - Slash);
   
   // Isolate the component
   Slash = Slash2;
   for (unsigned I = 0; I != 10; I++)
   {
      Slash = Path.find('/',Slash+1);
      if (Slash == string::npos || Slash + 2 >= Path.length())
	 return;
      string Comp = string(Path,Slash2+1,Slash - Slash2-1);
	 
      // Verify the trailing binary- bit
      string::size_type BinSlash = Path.find('/',Slash + 1);
      if (Slash == string::npos)
	 return;
      string Binary = string(Path,Slash+1,BinSlash - Slash-1);
      
      if (Binary != S && Binary != "source")
	 continue;

      Path = Dist + ' ' + Comp;
      return;
   }   
}
									/*}}}*/
// IndexCopy::GrabFirst - Return the first Depth path components	/*{{{*/
// ---------------------------------------------------------------------
/* */
bool IndexCopy::GrabFirst(string Path,string &To,unsigned int Depth)
{
   string::size_type I = 0;
   do
   {
      I = Path.find('/',I+1);
      Depth--;
   }
   while (I != string::npos && Depth != 0);
   
   if (I == string::npos)
      return false;

   To = string(Path,0,I+1);
   return true;
}
									/*}}}*/
// PackageCopy::GetFile - Get the file information from the section	/*{{{*/
// ---------------------------------------------------------------------
/* */
bool PackageCopy::GetFile(string &File,unsigned long &Size)
{
   File = Section->FindS("Filename");
   Size = Section->FindI("Size");
   if (File.empty() || Size == 0)
      return _error->Error("Cannot find filename or size tag");
   return true;
}
									/*}}}*/
// PackageCopy::RewriteEntry - Rewrite the entry with a new filename	/*{{{*/
// ---------------------------------------------------------------------
/* */
bool PackageCopy::RewriteEntry(FILE *Target,string File)
{
   TFRewriteData Changes[] = {{"Filename",File.c_str()},
                              {}};
   
   if (TFRewrite(Target,*Section,TFRewritePackageOrder,Changes) == false)
      return false;
   fputc('\n',Target);
   return true;
}
									/*}}}*/
// SourceCopy::GetFile - Get the file information from the section	/*{{{*/
// ---------------------------------------------------------------------
/* */
bool SourceCopy::GetFile(string &File,unsigned long &Size)
{
   string Files = Section->FindS("Files");
   if (Files.empty() == true)
      return false;

   // Stash the / terminated directory prefix
   string Base = Section->FindS("Directory");
   if (Base.empty() == false && Base[Base.length()-1] != '/')
      Base += '/';
   
   // Read the first file triplet
   const char *C = Files.c_str();
   string sSize;
   string MD5Hash;
   
   // Parse each of the elements
   if (ParseQuoteWord(C,MD5Hash) == false ||
       ParseQuoteWord(C,sSize) == false ||
       ParseQuoteWord(C,File) == false)
      return _error->Error("Error parsing file record");
   
   // Parse the size and append the directory
   Size = atoi(sSize.c_str());
   File = Base + File;
   return true;
}
									/*}}}*/
// SourceCopy::RewriteEntry - Rewrite the entry with a new filename	/*{{{*/
// ---------------------------------------------------------------------
/* */
bool SourceCopy::RewriteEntry(FILE *Target,string File)
{
   string Dir(File,0,File.rfind('/'));
   TFRewriteData Changes[] = {{"Directory",Dir.c_str()},
                              {}};
   
   if (TFRewrite(Target,*Section,TFRewriteSourceOrder,Changes) == false)
      return false;
   fputc('\n',Target);
   return true;
}


									/*}}}*/

bool SigVerify::Verify(string prefix, string file, indexRecords *MetaIndex)
{
   const indexRecords::checkSum *Record = MetaIndex->Lookup(file);

   if (!Record) 
   {
      _error->Warning("Can't find authentication record for: %s",file.c_str());
      return false;
   }

   MD5Summation sum;
   FileFd Fd(prefix+file, FileFd::ReadOnly);
   sum.AddFD(Fd.Fd(), Fd.Size());
   Fd.Close();
   string MD5 = (string)sum.Result();
   
   if (Record->MD5Hash != MD5)
   {
      _error->Warning("MD5 mismatch for: %s",file.c_str());
      return false;
   }

   if(_config->FindB("Debug::aptcdrom",false)) 
   {
      cout << "File: " << prefix+file << endl;
      cout << "Expected MD5sum: " << Record->MD5Hash << endl;
      cout << "got: " << MD5 << endl << endl;
   }

   return true;
}

bool SigVerify::CopyMetaIndex(string CDROM, string CDName, 
			      string prefix, string file)
{
      char S[400];
      snprintf(S,sizeof(S),"cdrom:[%s]/%s%s",CDName.c_str(),
	       (prefix).c_str() + CDROM.length(),file.c_str());
      string TargetF = _config->FindDir("Dir::State::lists");
      TargetF += URItoFileName(S);

      FileFd Target;
      FileFd Rel;
      Target.Open(TargetF,FileFd::WriteEmpty);
      Rel.Open(prefix + file,FileFd::ReadOnly);
      if (_error->PendingError() == true)
	 return false;
      if (CopyFile(Rel,Target) == false)
	 return false;
   
      return true;
}

bool SigVerify::CopyAndVerify(string CDROM,string Name,vector<string> &SigList,
			      vector<string> PkgList,vector<string> SrcList)
{
   if (SigList.size() == 0)
      return true;

   bool Debug = _config->FindB("Debug::aptcdrom",false);

   // Read all Release files
   for (vector<string>::iterator I = SigList.begin(); I != SigList.end(); I++)
   { 
      if(Debug)
	 cout << "Signature verify for: " << *I << endl;

      indexRecords *MetaIndex = new indexRecords;
      string prefix = *I; 

      // a Release.gpg without a Release should never happen
      if(!FileExists(*I+"Release"))
	 continue;


      // verify the gpg signature of "Release"
      // gpg --verify "*I+Release.gpg", "*I+Release"
      const char *Args[400];
      unsigned int i = 0;

      string gpgvpath = _config->Find("Dir::Bin::gpg", "/usr/bin/gpgv");
      string pubringpath = _config->Find("Apt::GPGV::TrustedKeyring", "/etc/apt/trusted.gpg");
      Args[i++] = gpgvpath.c_str();
      Args[i++] = "--keyring";
      Args[i++] = pubringpath.c_str();
      Configuration::Item const *Opts;
      Opts = _config->Tree("Acquire::gpgv::Options");
      if (Opts != 0)
      {
         Opts = Opts->Child;
	 for (; Opts != 0; Opts = Opts->Next)
         {
            if (Opts->Value.empty() == true)
               continue;
            Args[i++] = Opts->Value.c_str();
	    if(i >= 390) { 
	       _error->Error("Argument list from Acquire::gpgv::Options too long. Exiting.");
	       return false;
	    }
         }
      }
      Args[i++] = string(*I+"Release.gpg").c_str();
      Args[i++] = string(*I+"Release").c_str();
      Args[i++] = NULL;
      
      pid_t pid = ExecFork();
      if(pid < 0) {
	 _error->Error("Fork failed");
	 return false;
      }
      if(pid == 0) {
	 execvp(gpgvpath.c_str(), (char**)Args);
      }
      if(!ExecWait(pid, "gpgv")) {
	 _error->Warning("Signature verification failed for: %s",
			 string(*I+"Release.gpg").c_str());
	 // something went wrong, don't copy the Release.gpg
	 // FIXME: delete any existing gpg file?
	 continue;
      }

      // Open the Release file and add it to the MetaIndex
      if(!MetaIndex->Load(*I+"Release"))
      {
	 _error->Error(MetaIndex->ErrorText.c_str());
	 return false;
      }
      
      // go over the Indexfiles and see if they verify
      // if so, remove them from our copy of the lists
      vector<string> keys = MetaIndex->MetaKeys();
      for (vector<string>::iterator I = keys.begin(); I != keys.end(); I++)
      { 
	 if(!Verify(prefix,*I, MetaIndex)) {
	    // something went wrong, don't copy the Release.gpg
	    // FIXME: delete any existing gpg file?
	    continue;	 
	 }
      }

      // we need a fresh one for the Release.gpg
      delete MetaIndex;
   
      // everything was fine, copy the Release and Release.gpg file
      CopyMetaIndex(CDROM, Name, prefix, "Release");
      CopyMetaIndex(CDROM, Name, prefix, "Release.gpg");
   }   

   return true;
}