// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
-// $Id: fileutl.cc,v 1.19 1999/02/08 07:30:50 jgg Exp $
+// $Id: fileutl.cc,v 1.42 2002/09/14 05:29:22 jgg Exp $
/* ######################################################################
File Utilities
CopyFile - Buffered copy of a single file
GetLock - dpkg compatible lock file manipulation (fcntl)
- This source is placed in the Public Domain, do with it what you will
- It was originally written by Jason Gunthorpe.
+ Most of this source is placed in the Public Domain, do with it what
+ you will
+ It was originally written by Jason Gunthorpe <jgg@debian.org>.
+ The exception is RunScripts() it is under the GPLv2
+
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
-#ifdef __GNUG__
-#pragma implementation "apt-pkg/fileutl.h"
-#endif
#include <apt-pkg/fileutl.h>
+#include <apt-pkg/strutl.h>
#include <apt-pkg/error.h>
+#include <apt-pkg/sptr.h>
+#include <apt-pkg/configuration.h>
+
+#include <apti18n.h>
+#include <cstdlib>
+#include <cstring>
+
+#include <iostream>
#include <unistd.h>
+#include <fcntl.h>
#include <sys/stat.h>
-#include <sys/fcntl.h>
#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+#include <dirent.h>
+#include <signal.h>
#include <errno.h>
+#include <set>
+#include <algorithm>
+ /*}}}*/
+
+using namespace std;
+
+// RunScripts - Run a set of scripts from a configuration subtree /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool RunScripts(const char *Cnf)
+{
+ Configuration::Item const *Opts = _config->Tree(Cnf);
+ if (Opts == 0 || Opts->Child == 0)
+ return true;
+ Opts = Opts->Child;
+
+ // Fork for running the system calls
+ pid_t Child = ExecFork();
+
+ // This is the child
+ if (Child == 0)
+ {
+ if (chdir("/tmp/") != 0)
+ _exit(100);
+
+ unsigned int Count = 1;
+ for (; Opts != 0; Opts = Opts->Next, Count++)
+ {
+ if (Opts->Value.empty() == true)
+ continue;
+
+ if (system(Opts->Value.c_str()) != 0)
+ _exit(100+Count);
+ }
+ _exit(0);
+ }
+
+ // Wait for the child
+ int Status = 0;
+ while (waitpid(Child,&Status,0) != Child)
+ {
+ if (errno == EINTR)
+ continue;
+ return _error->Errno("waitpid","Couldn't wait for subprocess");
+ }
+
+ // Restore sig int/quit
+ signal(SIGQUIT,SIG_DFL);
+ signal(SIGINT,SIG_DFL);
+
+ // Check for an error code.
+ if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
+ {
+ unsigned int Count = WEXITSTATUS(Status);
+ if (Count > 100)
+ {
+ Count -= 100;
+ for (; Opts != 0 && Count != 1; Opts = Opts->Next, Count--);
+ _error->Error("Problem executing scripts %s '%s'",Cnf,Opts->Value.c_str());
+ }
+
+ return _error->Error("Sub-process returned an error code");
+ }
+
+ return true;
+}
/*}}}*/
// CopyFile - Buffered copy of a file /*{{{*/
return false;
// Buffered copy between fds
- unsigned char *Buf = new unsigned char[64000];
- long Size;
- while ((Size = read(From.Fd(),Buf,64000)) > 0)
+ SPtrArray<unsigned char> Buf = new unsigned char[64000];
+ unsigned long Size = From.Size();
+ while (Size != 0)
{
- if (To.Write(Buf,Size) == false)
- {
- delete [] Buf;
+ unsigned long ToRead = Size;
+ if (Size > 64000)
+ ToRead = 64000;
+
+ if (From.Read(Buf,ToRead) == false ||
+ To.Write(Buf,ToRead) == false)
return false;
- }
+
+ Size -= ToRead;
}
- delete [] Buf;
return true;
}
/*}}}*/
close at some time. */
int GetLock(string File,bool Errors)
{
- int FD = open(File.c_str(),O_RDWR | O_CREAT | O_TRUNC,0640);
+ // GetLock() is used in aptitude on directories with public-write access
+ // Use O_NOFOLLOW here to prevent symlink traversal attacks
+ int FD = open(File.c_str(),O_RDWR | O_CREAT | O_NOFOLLOW,0640);
if (FD < 0)
{
+ // Read only .. cant have locking problems there.
+ if (errno == EROFS)
+ {
+ _error->Warning(_("Not using locking for read only lock file %s"),File.c_str());
+ return dup(0); // Need something for the caller to close
+ }
+
if (Errors == true)
- _error->Errno("open","Could not open lock file %s",File.c_str());
+ _error->Errno("open",_("Could not open lock file %s"),File.c_str());
+
+ // Feh.. We do this to distinguish the lock vs open case..
+ errno = EPERM;
return -1;
}
-
+ SetCloseExec(FD,true);
+
// Aquire a write lock
struct flock fl;
fl.l_type = F_WRLCK;
fl.l_len = 0;
if (fcntl(FD,F_SETLK,&fl) == -1)
{
+ if (errno == ENOLCK)
+ {
+ _error->Warning(_("Not using locking for nfs mounted lock file %s"),File.c_str());
+ return dup(0); // Need something for the caller to close
+ }
if (Errors == true)
- _error->Errno("open","Could not get lock %s",File.c_str());
+ _error->Errno("open",_("Could not get lock %s"),File.c_str());
+
+ int Tmp = errno;
close(FD);
+ errno = Tmp;
return -1;
}
return true;
}
/*}}}*/
+// DirectoryExists - Check if a directory exists and is really one /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool DirectoryExists(string const &Path)
+{
+ struct stat Buf;
+ if (stat(Path.c_str(),&Buf) != 0)
+ return false;
+ return ((Buf.st_mode & S_IFDIR) != 0);
+}
+ /*}}}*/
+// CreateDirectory - poor man's mkdir -p guarded by a parent directory /*{{{*/
+// ---------------------------------------------------------------------
+/* This method will create all directories needed for path in good old
+ mkdir -p style but refuses to do this if Parent is not a prefix of
+ this Path. Example: /var/cache/ and /var/cache/apt/archives are given,
+ so it will create apt/archives if /var/cache exists - on the other
+ hand if the parent is /var/lib the creation will fail as this path
+ is not a parent of the path to be generated. */
+bool CreateDirectory(string const &Parent, string const &Path)
+{
+ if (Parent.empty() == true || Path.empty() == true)
+ return false;
+
+ if (DirectoryExists(Path) == true)
+ return true;
+
+ if (DirectoryExists(Parent) == false)
+ return false;
+
+ // we are not going to create directories "into the blue"
+ if (Path.find(Parent, 0) != 0)
+ return false;
+
+ vector<string> const dirs = VectorizeString(Path.substr(Parent.size()), '/');
+ string progress = Parent;
+ for (vector<string>::const_iterator d = dirs.begin(); d != dirs.end(); ++d)
+ {
+ if (d->empty() == true)
+ continue;
+
+ progress.append("/").append(*d);
+ if (DirectoryExists(progress) == true)
+ continue;
+
+ if (mkdir(progress.c_str(), 0755) != 0)
+ return false;
+ }
+ return true;
+}
+ /*}}}*/
+// GetListOfFilesInDir - returns a vector of files in the given dir /*{{{*/
+// ---------------------------------------------------------------------
+/* If an extension is given only files with this extension are included
+ in the returned vector, otherwise every "normal" file is included. */
+std::vector<string> GetListOfFilesInDir(string const &Dir, string const &Ext,
+ bool const &SortList, bool const &AllowNoExt)
+{
+ std::vector<string> ext;
+ ext.reserve(2);
+ if (Ext.empty() == false)
+ ext.push_back(Ext);
+ if (AllowNoExt == true && ext.empty() == false)
+ ext.push_back("");
+ return GetListOfFilesInDir(Dir, ext, SortList);
+}
+std::vector<string> GetListOfFilesInDir(string const &Dir, std::vector<string> const &Ext,
+ bool const &SortList)
+{
+ // Attention debuggers: need to be set with the environment config file!
+ bool const Debug = _config->FindB("Debug::GetListOfFilesInDir", false);
+ if (Debug == true)
+ {
+ std::clog << "Accept in " << Dir << " only files with the following " << Ext.size() << " extensions:" << std::endl;
+ if (Ext.empty() == true)
+ std::clog << "\tNO extension" << std::endl;
+ else
+ for (std::vector<string>::const_iterator e = Ext.begin();
+ e != Ext.end(); ++e)
+ std::clog << '\t' << (e->empty() == true ? "NO" : *e) << " extension" << std::endl;
+ }
+
+ std::vector<string> List;
+ DIR *D = opendir(Dir.c_str());
+ if (D == 0)
+ {
+ _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
+ return List;
+ }
+
+ for (struct dirent *Ent = readdir(D); Ent != 0; Ent = readdir(D))
+ {
+ // skip "hidden" files
+ if (Ent->d_name[0] == '.')
+ continue;
+
+ // check for accepted extension:
+ // no extension given -> periods are bad as hell!
+ // extensions given -> "" extension allows no extension
+ if (Ext.empty() == false)
+ {
+ string d_ext = flExtension(Ent->d_name);
+ if (d_ext == Ent->d_name) // no extension
+ {
+ if (std::find(Ext.begin(), Ext.end(), "") == Ext.end())
+ {
+ if (Debug == true)
+ std::clog << "Bad file: " << Ent->d_name << " → no extension" << std::endl;
+ continue;
+ }
+ }
+ else if (std::find(Ext.begin(), Ext.end(), d_ext) == Ext.end())
+ {
+ if (Debug == true)
+ std::clog << "Bad file: " << Ent->d_name << " → bad extension »" << flExtension(Ent->d_name) << "«" << std::endl;
+ continue;
+ }
+ }
+
+ // Skip bad filenames ala run-parts
+ const char *C = Ent->d_name;
+ for (; *C != 0; ++C)
+ if (isalpha(*C) == 0 && isdigit(*C) == 0
+ && *C != '_' && *C != '-') {
+ // no required extension -> dot is a bad character
+ if (*C == '.' && Ext.empty() == false)
+ continue;
+ break;
+ }
+
+ // we don't reach the end of the name -> bad character included
+ if (*C != 0)
+ {
+ if (Debug == true)
+ std::clog << "Bad file: " << Ent->d_name << " → bad character »"
+ << *C << "« in filename (period allowed: " << (Ext.empty() ? "no" : "yes") << ")" << std::endl;
+ continue;
+ }
+
+ // skip filenames which end with a period. These are never valid
+ if (*(C - 1) == '.')
+ {
+ if (Debug == true)
+ std::clog << "Bad file: " << Ent->d_name << " → Period as last character" << std::endl;
+ continue;
+ }
+
+ // Make sure it is a file and not something else
+ string const File = flCombine(Dir,Ent->d_name);
+ struct stat St;
+ if (stat(File.c_str(),&St) != 0 || S_ISREG(St.st_mode) == 0)
+ {
+ if (Debug == true)
+ std::clog << "Bad file: " << Ent->d_name << " → stat says not a good file" << std::endl;
+ continue;
+ }
+
+ if (Debug == true)
+ std::clog << "Accept file: " << Ent->d_name << " in " << Dir << std::endl;
+ List.push_back(File);
+ }
+ closedir(D);
+
+ if (SortList == true)
+ std::sort(List.begin(),List.end());
+ return List;
+}
+ /*}}}*/
// SafeGetCWD - This is a safer getcwd that returns a dynamic string /*{{{*/
// ---------------------------------------------------------------------
/* We return / on failure. */
/*}}}*/
// flNotFile - Strip the file from the directory name /*{{{*/
// ---------------------------------------------------------------------
-/* */
+/* Result ends in a / */
string flNotFile(string File)
{
string::size_type Res = File.rfind('/');
if (Res == string::npos)
- return File;
+ return "./";
Res++;
return string(File,0,Res);
}
/*}}}*/
+// flExtension - Return the extension for the file /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+string flExtension(string File)
+{
+ string::size_type Res = File.rfind('.');
+ if (Res == string::npos)
+ return File;
+ Res++;
+ return string(File,Res,Res - File.length());
+}
+ /*}}}*/
+// flNoLink - If file is a symlink then deref it /*{{{*/
+// ---------------------------------------------------------------------
+/* If the name is not a link then the returned path is the input. */
+string flNoLink(string File)
+{
+ struct stat St;
+ if (lstat(File.c_str(),&St) != 0 || S_ISLNK(St.st_mode) == 0)
+ return File;
+ if (stat(File.c_str(),&St) != 0)
+ return File;
+
+ /* Loop resolving the link. There is no need to limit the number of
+ loops because the stat call above ensures that the symlink is not
+ circular */
+ char Buffer[1024];
+ string NFile = File;
+ while (1)
+ {
+ // Read the link
+ int Res;
+ if ((Res = readlink(NFile.c_str(),Buffer,sizeof(Buffer))) <= 0 ||
+ (unsigned)Res >= sizeof(Buffer))
+ return File;
+
+ // Append or replace the previous path
+ Buffer[Res] = 0;
+ if (Buffer[0] == '/')
+ NFile = Buffer;
+ else
+ NFile = flNotFile(NFile) + Buffer;
+
+ // See if we are done
+ if (lstat(NFile.c_str(),&St) != 0)
+ return File;
+ if (S_ISLNK(St.st_mode) == 0)
+ return NFile;
+ }
+}
+ /*}}}*/
+// flCombine - Combine a file and a directory /*{{{*/
+// ---------------------------------------------------------------------
+/* If the file is an absolute path then it is just returned, otherwise
+ the directory is pre-pended to it. */
+string flCombine(string Dir,string File)
+{
+ if (File.empty() == true)
+ return string();
+
+ if (File[0] == '/' || Dir.empty() == true)
+ return File;
+ if (File.length() >= 2 && File[0] == '.' && File[1] == '/')
+ return File;
+ if (Dir[Dir.length()-1] == '/')
+ return Dir + File;
+ return Dir + '/' + File;
+}
+ /*}}}*/
// SetCloseExec - Set the close on exec flag /*{{{*/
// ---------------------------------------------------------------------
/* */
/*}}}*/
// WaitFd - Wait for a FD to become readable /*{{{*/
// ---------------------------------------------------------------------
-/* This waits for a FD to become readable using select. It is usefull for
- applications making use of non-blocking sockets. */
-bool WaitFd(int Fd)
+/* This waits for a FD to become readable using select. It is useful for
+ applications making use of non-blocking sockets. The timeout is
+ in seconds. */
+bool WaitFd(int Fd,bool write,unsigned long timeout)
{
fd_set Set;
+ struct timeval tv;
FD_ZERO(&Set);
FD_SET(Fd,&Set);
+ tv.tv_sec = timeout;
+ tv.tv_usec = 0;
+ if (write == true)
+ {
+ int Res;
+ do
+ {
+ Res = select(Fd+1,0,&Set,0,(timeout != 0?&tv:0));
+ }
+ while (Res < 0 && errno == EINTR);
+
+ if (Res <= 0)
+ return false;
+ }
+ else
+ {
+ int Res;
+ do
+ {
+ Res = select(Fd+1,&Set,0,0,(timeout != 0?&tv:0));
+ }
+ while (Res < 0 && errno == EINTR);
+
+ if (Res <= 0)
+ return false;
+ }
+
+ return true;
+}
+ /*}}}*/
+// ExecFork - Magical fork that sanitizes the context before execing /*{{{*/
+// ---------------------------------------------------------------------
+/* This is used if you want to cleanse the environment for the forked
+ child, it fixes up the important signals and nukes all of the fds,
+ otherwise acts like normal fork. */
+pid_t ExecFork()
+{
+ // Fork off the process
+ pid_t Process = fork();
+ if (Process < 0)
+ {
+ cerr << "FATAL -> Failed to fork." << endl;
+ exit(100);
+ }
- if (select(Fd+1,&Set,0,0,0) <= 0)
- return false;
+ // Spawn the subprocess
+ if (Process == 0)
+ {
+ // Setup the signals
+ signal(SIGPIPE,SIG_DFL);
+ signal(SIGQUIT,SIG_DFL);
+ signal(SIGINT,SIG_DFL);
+ signal(SIGWINCH,SIG_DFL);
+ signal(SIGCONT,SIG_DFL);
+ signal(SIGTSTP,SIG_DFL);
+
+ set<int> KeepFDs;
+ Configuration::Item const *Opts = _config->Tree("APT::Keep-Fds");
+ if (Opts != 0 && Opts->Child != 0)
+ {
+ Opts = Opts->Child;
+ for (; Opts != 0; Opts = Opts->Next)
+ {
+ if (Opts->Value.empty() == true)
+ continue;
+ int fd = atoi(Opts->Value.c_str());
+ KeepFDs.insert(fd);
+ }
+ }
+
+ // Close all of our FDs - just in case
+ for (int K = 3; K != 40; K++)
+ {
+ if(KeepFDs.find(K) == KeepFDs.end())
+ fcntl(K,F_SETFD,FD_CLOEXEC);
+ }
+ }
+
+ return Process;
+}
+ /*}}}*/
+// ExecWait - Fancy waitpid /*{{{*/
+// ---------------------------------------------------------------------
+/* Waits for the given sub process. If Reap is set then no errors are
+ generated. Otherwise a failed subprocess will generate a proper descriptive
+ message */
+bool ExecWait(pid_t Pid,const char *Name,bool Reap)
+{
+ if (Pid <= 1)
+ return true;
+
+ // Wait and collect the error code
+ int Status;
+ while (waitpid(Pid,&Status,0) != Pid)
+ {
+ if (errno == EINTR)
+ continue;
+
+ if (Reap == true)
+ return false;
+
+ return _error->Error(_("Waited for %s but it wasn't there"),Name);
+ }
+
+
+ // Check for an error code.
+ if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
+ {
+ if (Reap == true)
+ return false;
+ if (WIFSIGNALED(Status) != 0)
+ {
+ if( WTERMSIG(Status) == SIGSEGV)
+ return _error->Error(_("Sub-process %s received a segmentation fault."),Name);
+ else
+ return _error->Error(_("Sub-process %s received signal %u."),Name, WTERMSIG(Status));
+ }
+ if (WIFEXITED(Status) != 0)
+ return _error->Error(_("Sub-process %s returned an error code (%u)"),Name,WEXITSTATUS(Status));
+
+ return _error->Error(_("Sub-process %s exited unexpectedly"),Name);
+ }
+
return true;
}
/*}}}*/
-// FileFd::FileFd - Open a file /*{{{*/
+// FileFd::Open - Open a file /*{{{*/
// ---------------------------------------------------------------------
/* The most commonly used open mode combinations are given with Mode */
-FileFd::FileFd(string FileName,OpenMode Mode, unsigned long Perms)
+bool FileFd::Open(string FileName,OpenMode Mode, unsigned long Perms)
{
+ Close();
Flags = AutoClose;
switch (Mode)
{
case WriteEmpty:
{
struct stat Buf;
- if (stat(FileName.c_str(),&Buf) == 0 && S_ISLNK(Buf.st_mode))
+ if (lstat(FileName.c_str(),&Buf) == 0 && S_ISLNK(Buf.st_mode))
unlink(FileName.c_str());
iFd = open(FileName.c_str(),O_RDWR | O_CREAT | O_TRUNC,Perms);
break;
case WriteAny:
iFd = open(FileName.c_str(),O_RDWR | O_CREAT,Perms);
break;
+
+ case WriteTemp:
+ unlink(FileName.c_str());
+ iFd = open(FileName.c_str(),O_RDWR | O_CREAT | O_EXCL,Perms);
+ break;
}
if (iFd < 0)
- _error->Errno("open","Could not open file %s",FileName.c_str());
- else
- {
- this->FileName = FileName;
- SetCloseExec(iFd,true);
- }
+ return _error->Errno("open",_("Could not open file %s"),FileName.c_str());
+
+ this->FileName = FileName;
+ SetCloseExec(iFd,true);
+ return true;
}
/*}}}*/
// FileFd::~File - Closes the file /*{{{*/
/*}}}*/
// FileFd::Read - Read a bit of the file /*{{{*/
// ---------------------------------------------------------------------
-/* */
-bool FileFd::Read(void *To,unsigned long Size)
+/* We are carefull to handle interruption by a signal while reading
+ gracefully. */
+bool FileFd::Read(void *To,unsigned long Size,unsigned long *Actual)
{
- if (read(iFd,To,Size) != (signed)Size)
+ int Res;
+ errno = 0;
+ if (Actual != 0)
+ *Actual = 0;
+
+ do
{
- Flags |= Fail;
- return _error->Errno("read","Read error");
- }
+ Res = read(iFd,To,Size);
+ if (Res < 0 && errno == EINTR)
+ continue;
+ if (Res < 0)
+ {
+ Flags |= Fail;
+ return _error->Errno("read",_("Read error"));
+ }
- return true;
+ To = (char *)To + Res;
+ Size -= Res;
+ if (Actual != 0)
+ *Actual += Res;
+ }
+ while (Res > 0 && Size > 0);
+
+ if (Size == 0)
+ return true;
+
+ // Eof handling
+ if (Actual != 0)
+ {
+ Flags |= HitEof;
+ return true;
+ }
+
+ Flags |= Fail;
+ return _error->Error(_("read, still have %lu to read but none left"),Size);
}
/*}}}*/
// FileFd::Write - Write to the file /*{{{*/
/* */
bool FileFd::Write(const void *From,unsigned long Size)
{
- if (write(iFd,From,Size) != (signed)Size)
+ int Res;
+ errno = 0;
+ do
{
- Flags |= Fail;
- return _error->Errno("write","Write error");
+ Res = write(iFd,From,Size);
+ if (Res < 0 && errno == EINTR)
+ continue;
+ if (Res < 0)
+ {
+ Flags |= Fail;
+ return _error->Errno("write",_("Write error"));
+ }
+
+ From = (char *)From + Res;
+ Size -= Res;
}
+ while (Res > 0 && Size > 0);
- return true;
+ if (Size == 0)
+ return true;
+
+ Flags |= Fail;
+ return _error->Error(_("write, still have %lu to write but couldn't"),Size);
}
/*}}}*/
// FileFd::Seek - Seek in the file /*{{{*/
if (lseek(iFd,To,SEEK_SET) != (signed)To)
{
Flags |= Fail;
- return _error->Error("Unable to seek to %u",To);
+ return _error->Error("Unable to seek to %lu",To);
+ }
+
+ return true;
+}
+ /*}}}*/
+// FileFd::Skip - Seek in the file /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool FileFd::Skip(unsigned long Over)
+{
+ if (lseek(iFd,Over,SEEK_CUR) < 0)
+ {
+ Flags |= Fail;
+ return _error->Error("Unable to seek ahead %lu",Over);
+ }
+
+ return true;
+}
+ /*}}}*/
+// FileFd::Truncate - Truncate the file /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool FileFd::Truncate(unsigned long To)
+{
+ if (ftruncate(iFd,To) != 0)
+ {
+ Flags |= Fail;
+ return _error->Error("Unable to truncate to %lu",To);
}
return true;
bool Res = true;
if ((Flags & AutoClose) == AutoClose)
if (iFd >= 0 && close(iFd) != 0)
- Res &= _error->Errno("close","Problem closing the file");
+ Res &= _error->Errno("close",_("Problem closing the file"));
iFd = -1;
if ((Flags & Fail) == Fail && (Flags & DelOnFail) == DelOnFail &&
FileName.empty() == false)
if (unlink(FileName.c_str()) != 0)
- Res &= _error->Warning("unlnk","Problem unlinking the file");
+ Res &= _error->WarningE("unlnk",_("Problem unlinking the file"));
return Res;
}
/*}}}*/
+// FileFd::Sync - Sync the file /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool FileFd::Sync()
+{
+#ifdef _POSIX_SYNCHRONIZED_IO
+ if (fsync(iFd) != 0)
+ return _error->Errno("sync",_("Problem syncing the file"));
+#endif
+ return true;
+}
+ /*}}}*/
projects / apt.git / blobdiff