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+// -*- mode: cpp; mode: fold -*-
+// SPDX-License-Identifier: GPL-2.0+
+// 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 file had this historic note, but now includes further changes
+ under the GPL-2.0+:
+
+ 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 <ctime>
+#include <set>
+#include <string>
+#include <vector>
+#include <sys/stat.h>
+
+/* Define this for python-apt */
+#define APT_HAS_GZIP 1
+
+class FileFdPrivate;
+class APT_PUBLIC 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();
+
+ 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);};
+
+ 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;
+};
+
+APT_PUBLIC bool RunScripts(const char *Cnf);
+APT_PUBLIC bool CopyFile(FileFd &From,FileFd &To);
+APT_PUBLIC bool RemoveFile(char const * const Function, std::string const &FileName);
+APT_PUBLIC bool RemoveFileAt(char const * const Function, int const dirfd, std::string const &FileName);
+APT_PUBLIC int GetLock(std::string File,bool Errors = true);
+APT_PUBLIC bool FileExists(std::string File);
+APT_PUBLIC bool RealFileExists(std::string File);
+APT_PUBLIC bool DirectoryExists(std::string const &Path);
+APT_PUBLIC bool CreateDirectory(std::string const &Parent, std::string const &Path);
+APT_PUBLIC time_t GetModificationTime(std::string const &Path);
+APT_PUBLIC bool Rename(std::string From, std::string To);
+
+APT_PUBLIC std::string GetTempDir();
+APT_PUBLIC std::string GetTempDir(std::string const &User);
+APT_PUBLIC FileFd* GetTempFile(std::string const &Prefix = "",
+ bool ImmediateUnlink = true,
+ FileFd * const TmpFd = NULL);
+
+// FIXME: GetTempFile should always return a buffered file
+APT_HIDDEN FileFd* GetTempFile(std::string const &Prefix,
+ bool ImmediateUnlink ,
+ FileFd * const TmpFd,
+ bool Buffered);
+
+/** \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
+ */
+APT_PUBLIC bool CreateAPTDirectoryIfNeeded(std::string const &Parent, std::string const &Path);
+
+APT_PUBLIC std::vector<std::string> GetListOfFilesInDir(std::string const &Dir, std::string const &Ext,
+ bool const &SortList, bool const &AllowNoExt=false);
+APT_PUBLIC std::vector<std::string> GetListOfFilesInDir(std::string const &Dir, std::vector<std::string> const &Ext,
+ bool const &SortList);
+APT_PUBLIC std::vector<std::string> GetListOfFilesInDir(std::string const &Dir, bool SortList);
+APT_PUBLIC std::string SafeGetCWD();
+APT_PUBLIC void SetCloseExec(int Fd,bool Close);
+APT_PUBLIC void SetNonBlock(int Fd,bool Block);
+APT_PUBLIC bool WaitFd(int Fd,bool write = false,unsigned long timeout = 0);
+APT_PUBLIC pid_t ExecFork();
+APT_PUBLIC pid_t ExecFork(std::set<int> keep_fds);
+APT_PUBLIC void MergeKeepFdsFromConfiguration(std::set<int> &keep_fds);
+APT_PUBLIC bool ExecWait(pid_t Pid,const char *Name,bool Reap = false);
+
+// check if the given file starts with a PGP cleartext signature
+APT_PUBLIC 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
+ */
+APT_PUBLIC 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
+ */
+APT_PUBLIC bool DropPrivileges();
+
+// File string manipulators
+APT_PUBLIC std::string flNotDir(std::string File);
+APT_PUBLIC std::string flNotFile(std::string File);
+APT_PUBLIC std::string flNoLink(std::string File);
+APT_PUBLIC std::string flExtension(std::string File);
+APT_PUBLIC std::string flCombine(std::string Dir,std::string File);
+
+/** \brief Takes a file path and returns the absolute path
+ */
+APT_PUBLIC std::string flAbsPath(std::string File);
+/** \brief removes superfluous /./ and // from path */
+APT_HIDDEN std::string flNormalize(std::string file);
+
+// simple c++ glob
+APT_PUBLIC 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
+ */
+APT_PUBLIC bool Popen(const char *Args[], FileFd &Fd, pid_t &Child, FileFd::OpenMode Mode, bool CaptureStderr = true, bool Sandbox = false);
+
+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