// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
-// $Id: fileutl.cc,v 1.27 1999/04/20 05:02:09 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/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];
+ SPtrArray<unsigned char> Buf = new unsigned char[64000];
unsigned long Size = From.Size();
while (Size != 0)
{
if (From.Read(Buf,ToRead) == false ||
To.Write(Buf,ToRead) == false)
- {
- delete [] Buf;
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;
{
if (errno == ENOLCK)
{
- _error->Warning("Not using locking for nfs mounted lock file %s",File.c_str());
- return true;
+ _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;
}
/*}}}*/
+// 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)
+{
+ return GetListOfFilesInDir(Dir, Ext, SortList, false);
+}
+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
+/* 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)
/* 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. */
-int ExecFork()
+pid_t ExecFork()
{
// Fork off the process
pid_t Process = fork();
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++)
- fcntl(K,F_SETFD,FD_CLOEXEC);
+ {
+ 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 /*{{{*/
// ---------------------------------------------------------------------
/* We are carefull to handle interruption by a signal while reading
gracefully. */
-bool FileFd::Read(void *To,unsigned long Size)
+bool FileFd::Read(void *To,unsigned long Size,unsigned long *Actual)
{
int Res;
errno = 0;
+ if (Actual != 0)
+ *Actual = 0;
+
do
{
Res = read(iFd,To,Size);
if (Res < 0)
{
Flags |= Fail;
- return _error->Errno("read","Read error");
+ return _error->Errno("read",_("Read error"));
}
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 %u to read but none left",Size);
+ return _error->Error(_("read, still have %lu to read but none left"),Size);
}
/*}}}*/
// FileFd::Write - Write to the file /*{{{*/
if (Res < 0)
{
Flags |= Fail;
- return _error->Errno("write","Write error");
+ return _error->Errno("write",_("Write error"));
}
From = (char *)From + Res;
return true;
Flags |= Fail;
- return _error->Error("write, still have %u to write but couldn't",Size);
+ 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;
if (ftruncate(iFd,To) != 0)
{
Flags |= Fail;
- return _error->Error("Unable to truncate to %u",To);
+ 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