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| -rw-r--r-- | apt-pkg/contrib/fileutl.h | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/apt-pkg/contrib/fileutl.h b/apt-pkg/contrib/fileutl.h new file mode 100644 index 0000000..9005b81 --- /dev/null +++ b/apt-pkg/contrib/fileutl.h @@ -0,0 +1,305 @@ +// -*- mode: cpp; mode: fold -*- +// Description /*{{{*/ +/* ###################################################################### + + File Utilities + + CopyFile - Buffered copy of a single file + GetLock - dpkg compatible lock file manipulation (fcntl) + FileExists - Returns true if the file exists + SafeGetCWD - Returns the CWD in a string with overrun protection + + The file class is a handy abstraction for various functions+classes + that need to accept filenames. + + This source is placed in the Public Domain, do with it what you will + It was originally written by Jason Gunthorpe. + + ##################################################################### */ + /*}}}*/ +#ifndef PKGLIB_FILEUTL_H +#define PKGLIB_FILEUTL_H + +#include <apt-pkg/aptconfiguration.h> +#include <apt-pkg/macros.h> + +#include <set> +#include <string> +#include <vector> +#include <time.h> + +#include <zlib.h> + +#ifndef APT_8_CLEANER_HEADERS +using std::string; +#endif + +/* Define this for python-apt */ +#define APT_HAS_GZIP 1 + +class FileFdPrivate; +class FileFd +{ + friend class FileFdPrivate; + friend class GzipFileFdPrivate; + friend class Bz2FileFdPrivate; + friend class LzmaFileFdPrivate; + friend class Lz4FileFdPrivate; + friend class ZstdFileFdPrivate; + friend class DirectFileFdPrivate; + friend class PipedFileFdPrivate; + protected: + int iFd; + + enum LocalFlags {AutoClose = (1<<0),Fail = (1<<1),DelOnFail = (1<<2), + HitEof = (1<<3), Replace = (1<<4), Compressed = (1<<5) }; + unsigned long Flags; + std::string FileName; + std::string TemporaryFileName; + + public: + enum OpenMode { + ReadOnly = (1 << 0), + WriteOnly = (1 << 1), + ReadWrite = ReadOnly | WriteOnly, + + Create = (1 << 2), + Exclusive = (1 << 3), + Atomic = Exclusive | (1 << 4), + Empty = (1 << 5), + BufferedWrite = (1 << 6), + + WriteEmpty = ReadWrite | Create | Empty, + WriteExists = ReadWrite, + WriteAny = ReadWrite | Create, + WriteTemp = ReadWrite | Create | Exclusive, + ReadOnlyGzip, + WriteAtomic = ReadWrite | Create | Atomic + }; + enum CompressMode + { + Auto = 'A', + None = 'N', + Extension = 'E', + Gzip = 'G', + Bzip2 = 'B', + Lzma = 'L', + Xz = 'X', + Lz4 = '4', + Zstd = 'Z' + }; + + inline bool Read(void *To,unsigned long long Size,bool AllowEof) + { + unsigned long long Jnk; + if (AllowEof) + return Read(To,Size,&Jnk); + return Read(To,Size); + } + bool Read(void *To,unsigned long long Size,unsigned long long *Actual = 0); + bool static Read(int const Fd, void *To, unsigned long long Size, unsigned long long * const Actual = 0); + /** read a complete line or until buffer is full + * + * The buffer will always be \\0 terminated, so at most Size-1 characters are read. + * If the buffer holds a complete line the last character (before \\0) will be + * the newline character \\n otherwise the line was longer than the buffer. + * + * @param To buffer which will hold the line + * @param Size of the buffer to fill + * @param \b nullptr is returned in error cases, otherwise + * the parameter \b To now filled with the line. + */ + char* ReadLine(char *To, unsigned long long const Size); + /** read a complete line from the file + * + * Similar to std::getline() the string does \b not include + * the newline, but just the content of the line as the newline + * is not needed to distinguish cases as for the other #ReadLine method. + * + * @param To string which will hold the line + * @return \b true if successful, otherwise \b false + */ + bool ReadLine(std::string &To); + bool Flush(); + bool Write(const void *From,unsigned long long Size); + bool static Write(int Fd, const void *From, unsigned long long Size); + bool Seek(unsigned long long To); + bool Skip(unsigned long long To); + bool Truncate(unsigned long long To); + unsigned long long Tell(); + // the size of the file content (compressed files will be uncompressed first) + unsigned long long Size(); + // the size of the file itself + unsigned long long FileSize(); + time_t ModificationTime(); + + /* You want to use 'unsigned long long' if you are talking about a file + to be able to support large files (>2 or >4 GB) properly. + This shouldn't happen all to often for the indexes, but deb's might be… + And as the auto-conversation converts a 'unsigned long *' to a 'bool' + instead of 'unsigned long long *' we need to provide this explicitly - + otherwise applications magically start to fail… */ + bool Read(void *To,unsigned long long Size,unsigned long *Actual) APT_DEPRECATED_MSG("The Actual variable you pass in should be an unsigned long long") + { + unsigned long long R; + bool const T = Read(To, Size, &R); + *Actual = R; + return T; + } + + bool Open(std::string FileName,unsigned int const Mode,CompressMode Compress,unsigned long const AccessMode = 0666); + bool Open(std::string FileName,unsigned int const Mode,APT::Configuration::Compressor const &compressor,unsigned long const AccessMode = 0666); + inline bool Open(std::string const &FileName,unsigned int const Mode, unsigned long const AccessMode = 0666) { + return Open(FileName, Mode, None, AccessMode); + }; + bool OpenDescriptor(int Fd, unsigned int const Mode, CompressMode Compress, bool AutoClose=false); + bool OpenDescriptor(int Fd, unsigned int const Mode, APT::Configuration::Compressor const &compressor, bool AutoClose=false); + inline bool OpenDescriptor(int Fd, unsigned int const Mode, bool AutoClose=false) { + return OpenDescriptor(Fd, Mode, None, AutoClose); + }; + bool Close(); + bool Sync(); + + // Simple manipulators + inline int Fd() {return iFd;}; + inline void Fd(int fd) { OpenDescriptor(fd, ReadWrite);}; + gzFile gzFd() APT_DEPRECATED_MSG("Implementation detail, do not use to be able to support bzip2, xz and co") APT_PURE; + + inline bool IsOpen() {return iFd >= 0;}; + inline bool Failed() {return (Flags & Fail) == Fail;}; + inline void EraseOnFailure() {Flags |= DelOnFail;}; + inline void OpFail() {Flags |= Fail;}; + inline bool Eof() {return (Flags & HitEof) == HitEof;}; + inline bool IsCompressed() {return (Flags & Compressed) == Compressed;}; + inline std::string &Name() {return FileName;}; + inline void SetFileName(std::string const &name) { FileName = name; }; + + FileFd(std::string FileName,unsigned int const Mode,unsigned long AccessMode = 0666); + FileFd(std::string FileName,unsigned int const Mode, CompressMode Compress, unsigned long AccessMode = 0666); + FileFd(); + FileFd(int const Fd, unsigned int const Mode = ReadWrite, CompressMode Compress = None); + FileFd(int const Fd, bool const AutoClose); + virtual ~FileFd(); + + private: + FileFdPrivate * d; + APT_HIDDEN FileFd(const FileFd &); + APT_HIDDEN FileFd & operator=(const FileFd &); + APT_HIDDEN bool OpenInternDescriptor(unsigned int const Mode, APT::Configuration::Compressor const &compressor); + + // private helpers to set Fail flag and call _error->Error + APT_HIDDEN bool FileFdErrno(const char* Function, const char* Description,...) APT_PRINTF(3) APT_COLD; + APT_HIDDEN bool FileFdError(const char* Description,...) APT_PRINTF(2) APT_COLD; +}; + +bool RunScripts(const char *Cnf); +bool CopyFile(FileFd &From,FileFd &To); +bool RemoveFile(char const * const Function, std::string const &FileName); +bool RemoveFileAt(char const * const Function, int const dirfd, std::string const &FileName); +int GetLock(std::string File,bool Errors = true); +bool FileExists(std::string File); +bool RealFileExists(std::string File); +bool DirectoryExists(std::string const &Path); +bool CreateDirectory(std::string const &Parent, std::string const &Path); +time_t GetModificationTime(std::string const &Path); +bool Rename(std::string From, std::string To); + +std::string GetTempDir(); +std::string GetTempDir(std::string const &User); +FileFd* GetTempFile(std::string const &Prefix = "", + bool ImmediateUnlink = true, + FileFd * const TmpFd = NULL); + +// FIXME: GetTempFile should always return a buffered file +FileFd* GetTempFile(std::string const &Prefix, + bool ImmediateUnlink , + FileFd * const TmpFd, + bool Buffered) APT_HIDDEN; + +/** \brief Ensure the existence of the given Path + * + * \param Parent directory of the Path directory - a trailing + * /apt/ will be removed before CreateDirectory call. + * \param Path which should exist after (successful) call + */ +bool CreateAPTDirectoryIfNeeded(std::string const &Parent, std::string const &Path); + +std::vector<std::string> GetListOfFilesInDir(std::string const &Dir, std::string const &Ext, + bool const &SortList, bool const &AllowNoExt=false); +std::vector<std::string> GetListOfFilesInDir(std::string const &Dir, std::vector<std::string> const &Ext, + bool const &SortList); +std::vector<std::string> GetListOfFilesInDir(std::string const &Dir, bool SortList); +std::string SafeGetCWD(); +void SetCloseExec(int Fd,bool Close); +void SetNonBlock(int Fd,bool Block); +bool WaitFd(int Fd,bool write = false,unsigned long timeout = 0); +pid_t ExecFork(); +pid_t ExecFork(std::set<int> keep_fds); +void MergeKeepFdsFromConfiguration(std::set<int> &keep_fds); +bool ExecWait(pid_t Pid,const char *Name,bool Reap = false); + +// check if the given file starts with a PGP cleartext signature +bool StartsWithGPGClearTextSignature(std::string const &FileName); + +/** change file attributes to requested known good values + * + * The method skips the user:group setting if not root. + * + * @param requester is printed as functionname in error cases + * @param file is the file to be modified + * @param user is the (new) owner of the file, e.g. _apt + * @param group is the (new) group owning the file, e.g. root + * @param mode is the access mode of the file, e.g. 0644 + */ +bool ChangeOwnerAndPermissionOfFile(char const * const requester, char const * const file, char const * const user, char const * const group, mode_t const mode); + +/** + * \brief Drop privileges + * + * Drop the privileges to the user _apt (or the one specified in + * APT::Sandbox::User). This does not set the supplementary group + * ids up correctly, it only uses the default group. Also prevent + * the process from gaining any new privileges afterwards, at least + * on Linux. + * + * \return true on success, false on failure with _error set + */ +bool DropPrivileges(); + +// File string manipulators +std::string flNotDir(std::string File); +std::string flNotFile(std::string File); +std::string flNoLink(std::string File); +std::string flExtension(std::string File); +std::string flCombine(std::string Dir,std::string File); + +/** \brief Takes a file path and returns the absolute path + */ +std::string flAbsPath(std::string File); +/** \brief removes superfluous /./ and // from path */ +APT_HIDDEN std::string flNormalize(std::string file); + +// simple c++ glob +std::vector<std::string> Glob(std::string const &pattern, int flags=0); + +/** \brief Popen() implementation that execv() instead of using a shell + * + * \param Args the execv style command to run + * \param FileFd is a reference to the FileFd to use for input or output + * \param Child a reference to the integer that stores the child pid + * Note that you must call ExecWait() or similar to cleanup + * \param Mode is either FileFd::ReadOnly or FileFd::WriteOnly + * \param CaptureStderr True if we should capture stderr in addition to stdout. + * (default: True). + * \param Sandbox True if this should run sandboxed + * \return true on success, false on failure with _error set + */ +bool Popen(const char *Args[], FileFd &Fd, pid_t &Child, FileFd::OpenMode Mode, bool CaptureStderr, bool Sandbox) APT_HIDDEN; +bool Popen(const char* Args[], FileFd &Fd, pid_t &Child, FileFd::OpenMode Mode, bool CaptureStderr); +bool Popen(const char* Args[], FileFd &Fd, pid_t &Child, FileFd::OpenMode Mode); + +APT_HIDDEN bool OpenConfigurationFileFd(std::string const &File, FileFd &Fd); + +APT_HIDDEN int Inhibit(const char *what, const char *who, const char *why, const char *mode); + +#endif |