diff options
Diffstat (limited to 'apt-pkg/indexcopy.cc')
| -rw-r--r-- | apt-pkg/indexcopy.cc | 644 |
1 files changed, 644 insertions, 0 deletions
diff --git a/apt-pkg/indexcopy.cc b/apt-pkg/indexcopy.cc new file mode 100644 index 00000000..90100189 --- /dev/null +++ b/apt-pkg/indexcopy.cc @@ -0,0 +1,644 @@ +// -*- 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 mismachted files\n"), + Packages, WrongSize); + if (NotFound != 0 && WrongSize != 0) + ioprintf(msg, _("Wrote %i records with %i missing files and %i mismachted 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" + string gpgvpath = _config->Find("Dir::Bin::gpg", "/usr/bin/gpgv"); + string pubringpath = _config->Find("Apt::GPGV::TrustedKeyring", "/etc/apt/trusted.gpg"); + pid_t pid = ExecFork(); + if(pid < 0) { + _error->Error("Fork failed"); + return false; + } + if(pid == 0) { + execlp(gpgvpath.c_str(), gpgvpath.c_str(), "--keyring", + pubringpath.c_str(), string(*I+"Release.gpg").c_str(), + string(*I+"Release").c_str(), NULL); + } + 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; +} |