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fileutl.cc
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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
/* ######################################################################
File Utilities
CopyFile - Buffered copy of a single file
GetLock - dpkg compatible lock file manipulation (fcntl)
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>.
FileFd gzip support added by Martin Pitt <martin.pitt@canonical.com>
The exception is RunScripts() it is under the GPLv2
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
#include <config.h>
#include <apt-pkg/aptconfiguration.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/error.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/macros.h>
#include <apt-pkg/pkgsystem.h>
#include <apt-pkg/strutl.h>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <string>
#include <vector>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <glob.h>
#include <grp.h>
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include <algorithm>
#include <memory>
#include <set>
#ifdef HAVE_ZLIB
#include <zlib.h>
#endif
#ifdef HAVE_BZ2
#include <bzlib.h>
#endif
#ifdef HAVE_LZMA
#include <lzma.h>
#endif
#ifdef HAVE_LZ4
#include <lz4frame.h>
#endif
#ifdef HAVE_ZSTD
#include <zstd.h>
#endif
#ifdef HAVE_SYSTEMD
#include <systemd/sd-bus.h>
#endif
#include <endian.h>
#include <stdint.h>
#if __gnu_linux__
#include <sys/prctl.h>
#endif
#include <apti18n.h>
/*}}}*/
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 (_system != nullptr && _system->IsLocked() == true && (stringcasecmp(Cnf, "dpkg::post-invoke") == 0 || stringcasecmp(Cnf, "dpkg::pre-invoke") == 0))
setenv("DPKG_FRONTEND_LOCKED", "true", 1);
if (_config->FindDir("DPkg::Chroot-Directory","/") != "/")
{
std::cerr << "Chrooting into "
<< _config->FindDir("DPkg::Chroot-Directory")
<< std::endl;
if (chroot(_config->FindDir("DPkg::Chroot-Directory","/").c_str()) != 0)
_exit(100);
}
if (chdir("/tmp/") != 0)
_exit(100);
unsigned int Count = 1;
for (; Opts != 0; Opts = Opts->Next, Count++)
{
if (Opts->Value.empty() == true)
continue;
if(_config->FindB("Debug::RunScripts", false) == true)
std::clog << "Running external script: '"
<< Opts->Value << "'" << std::endl;
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 /*{{{*/
// ---------------------------------------------------------------------
/* The caller is expected to set things so that failure causes erasure */
bool CopyFile(FileFd &From,FileFd &To)
{
if (From.IsOpen() == false || To.IsOpen() == false ||
From.Failed() == true || To.Failed() == true)
return false;
// Buffered copy between fds
constexpr size_t BufSize = APT_BUFFER_SIZE;
std::unique_ptr<unsigned char[]> Buf(new unsigned char[BufSize]);
unsigned long long ToRead = 0;
do {
if (From.Read(Buf.get(),BufSize, &ToRead) == false ||
To.Write(Buf.get(),ToRead) == false)
return false;
} while (ToRead != 0);
return true;
}
/*}}}*/
bool RemoveFileAt(char const * const Function, int const dirfd, std::string const &FileName)/*{{{*/
{
if (FileName == "/dev/null")
return true;
errno = 0;
if (unlinkat(dirfd, FileName.c_str(), 0) != 0)
{
if (errno == ENOENT)
return true;
return _error->WarningE(Function,_("Problem unlinking the file %s"), FileName.c_str());
}
return true;
}
/*}}}*/
bool RemoveFile(char const * const Function, std::string const &FileName)/*{{{*/
{
if (FileName == "/dev/null")
return true;
errno = 0;
if (unlink(FileName.c_str()) != 0)
{
if (errno == ENOENT)
return true;
return _error->WarningE(Function,_("Problem unlinking the file %s"), FileName.c_str());
}
return true;
}
/*}}}*/
// GetLock - Gets a lock file /*{{{*/
// ---------------------------------------------------------------------
/* This will create an empty file of the given name and lock it. Once this
is done all other calls to GetLock in any other process will fail with
-1. The return result is the fd of the file, the call should call
close at some time. */
static std::string GetProcessName(int pid)
{
struct HideError
{
int err;
HideError() : err(errno) { _error->PushToStack(); }
~HideError()
{
errno = err;
_error->RevertToStack();
}
} hideError;
std::string path;
strprintf(path, "/proc/%d/status", pid);
FileFd status(path, FileFd::ReadOnly);
std::string line;
while (status.ReadLine(line))
{
if (line.substr(0, 5) == "Name:")
return line.substr(6);
}
return "";
}
int GetLock(string File,bool Errors)
{
// 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 .. can't 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());
// Feh.. We do this to distinguish the lock vs open case..
errno = EPERM;
return -1;
}
SetCloseExec(FD,true);
// Acquire a write lock
struct flock fl;
fl.l_type = F_WRLCK;
fl.l_whence = SEEK_SET;
fl.l_start = 0;
fl.l_len = 0;
if (fcntl(FD,F_SETLK,&fl) == -1)
{
// always close to not leak resources
int Tmp = errno;
if ((errno == EACCES || errno == EAGAIN))
{
fl.l_type = F_WRLCK;
fl.l_whence = SEEK_SET;
fl.l_start = 0;
fl.l_len = 0;
fl.l_pid = -1;
fcntl(FD, F_GETLK, &fl);
}
else
{
fl.l_pid = -1;
}
close(FD);
errno = Tmp;
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)
{
// We only do the lookup in the if ((errno == EACCES || errno == EAGAIN))
// case, so we do not need to show the errno strerrr here...
if (fl.l_pid != -1)
{
auto name = GetProcessName(fl.l_pid);
if (name.empty())
_error->Error(_("Could not get lock %s. It is held by process %d"), File.c_str(), fl.l_pid);
else
_error->Error(_("Could not get lock %s. It is held by process %d (%s)"), File.c_str(), fl.l_pid, name.c_str());
}
else
_error->Errno("open", _("Could not get lock %s"), File.c_str());
_error->Notice(_("Be aware that removing the lock file is not a solution and may break your system."));
}
return -1;
}
return FD;
}
/*}}}*/
// FileExists - Check if a file exists /*{{{*/
// ---------------------------------------------------------------------
/* Beware: Directories are also files! */
bool FileExists(string File)
{
struct stat Buf;
if (stat(File.c_str(),&Buf) != 0)
return false;
return true;
}
/*}}}*/
// RealFileExists - Check if a file exists and if it is really a file /*{{{*/
// ---------------------------------------------------------------------
/* */
bool RealFileExists(string File)
{
struct stat Buf;
if (stat(File.c_str(),&Buf) != 0)
return false;
return ((Buf.st_mode & S_IFREG) != 0);
}
/*}}}*/
// 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.compare(0, Parent.length(), Parent) != 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;
}
/*}}}*/
// CreateAPTDirectoryIfNeeded - ensure that the given directory exists /*{{{*/
// ---------------------------------------------------------------------
/* a small wrapper around CreateDirectory to check if it exists and to
remove the trailing "/apt/" from the parent directory if needed */
bool CreateAPTDirectoryIfNeeded(string const &Parent, string const &Path)
{
if (DirectoryExists(Path) == true)
return true;
size_t const len = Parent.size();
if (len > 5 && Parent.find("/apt/", len - 6, 5) == len - 5)
{
if (CreateDirectory(Parent.substr(0,len-5), Path) == true)
return true;
}
else if (CreateDirectory(Parent, Path) == true)
return true;
return false;
}
/*}}}*/
// 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;
if (DirectoryExists(Dir) == false)
{
_error->Error(_("List of files can't be created as '%s' is not a directory"), Dir.c_str());
return List;
}
Configuration::MatchAgainstConfig SilentIgnore("Dir::Ignore-Files-Silently");
DIR *D = opendir(Dir.c_str());
if (D == 0)
{
if (errno == EACCES)
_error->WarningE("opendir", _("Unable to read %s"), Dir.c_str());
else
_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;
// Make sure it is a file and not something else
string const File = flCombine(Dir,Ent->d_name);
#ifdef _DIRENT_HAVE_D_TYPE
if (Ent->d_type != DT_REG)
#endif
{
if (RealFileExists(File) == false)
{
// do not show ignoration warnings for directories
if (
#ifdef _DIRENT_HAVE_D_TYPE
Ent->d_type == DT_DIR ||
#endif
DirectoryExists(File) == true)
continue;
if (SilentIgnore.Match(Ent->d_name) == false)
_error->Notice(_("Ignoring '%s' in directory '%s' as it is not a regular file"), Ent->d_name, Dir.c_str());
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;
if (SilentIgnore.Match(Ent->d_name) == false)
_error->Notice(_("Ignoring file '%s' in directory '%s' as it has no filename extension"), Ent->d_name, Dir.c_str());
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;
if (SilentIgnore.Match(Ent->d_name) == false)
_error->Notice(_("Ignoring file '%s' in directory '%s' as it has an invalid filename extension"), Ent->d_name, Dir.c_str());
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 != '-' && *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;
}
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;
}
std::vector<string> GetListOfFilesInDir(string const &Dir, bool SortList)
{
bool const Debug = _config->FindB("Debug::GetListOfFilesInDir", false);
if (Debug == true)
std::clog << "Accept in " << Dir << " all regular files" << std::endl;
std::vector<string> List;
if (DirectoryExists(Dir) == false)
{
_error->Error(_("List of files can't be created as '%s' is not a directory"), Dir.c_str());
return 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;
// Make sure it is a file and not something else
string const File = flCombine(Dir,Ent->d_name);
#ifdef _DIRENT_HAVE_D_TYPE
if (Ent->d_type != DT_REG)
#endif
{
if (RealFileExists(File) == false)
{
if (Debug == true)
std::clog << "Bad file: " << Ent->d_name << " → it is not a real file" << 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 != '-' && *C != '.')
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" << 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;
}
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. */
string SafeGetCWD()
{
// Stash the current dir.
char S[300];
S[0] = 0;
if (getcwd(S,sizeof(S)-2) == 0)
return "/";
unsigned int Len = strlen(S);
S[Len] = '/';
S[Len+1] = 0;
return S;
}
/*}}}*/
// GetModificationTime - Get the mtime of the given file or -1 on error /*{{{*/
// ---------------------------------------------------------------------
/* We return / on failure. */
time_t GetModificationTime(string const &Path)
{
struct stat St;
if (stat(Path.c_str(), &St) < 0)
return -1;
return St.st_mtime;
}
/*}}}*/
// flNotDir - Strip the directory from the filename /*{{{*/
// ---------------------------------------------------------------------
/* */
string flNotDir(string File)
{
string::size_type Res = File.rfind('/');
if (Res == string::npos)
return File;
Res++;
return string(File,Res,Res - File.length());
}
/*}}}*/
// 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 "./";
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
ssize_t Res;
if ((Res = readlink(NFile.c_str(),Buffer,sizeof(Buffer))) <= 0 ||
(size_t)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;
}
/*}}}*/
// flAbsPath - Return the absolute path of the filename /*{{{*/
// ---------------------------------------------------------------------
/* */
string flAbsPath(string File)
{
char *p = realpath(File.c_str(), NULL);
if (p == NULL)
{
_error->Errno("realpath", "flAbsPath on %s failed", File.c_str());
return "";
}
std::string AbsPath(p);
free(p);
return AbsPath;
}
/*}}}*/
std::string flNormalize(std::string file) /*{{{*/
{
if (file.empty())
return file;
// do some normalisation by removing // and /./ from the path
size_t found = string::npos;
while ((found = file.find("/./")) != string::npos)
file.replace(found, 3, "/");
while ((found = file.find("//")) != string::npos)
file.replace(found, 2, "/");
if (APT::String::Startswith(file, "/dev/null"))
{
file.erase(strlen("/dev/null"));
return file;
}
return file;
}
/*}}}*/
// SetCloseExec - Set the close on exec flag /*{{{*/
// ---------------------------------------------------------------------
/* */
void SetCloseExec(int Fd,bool Close)
{
if (fcntl(Fd,F_SETFD,(Close == false)?0:FD_CLOEXEC) != 0)
{
cerr << "FATAL -> Could not set close on exec " << strerror(errno) << endl;
exit(100);
}
}
/*}}}*/
// SetNonBlock - Set the nonblocking flag /*{{{*/
// ---------------------------------------------------------------------
/* */
void SetNonBlock(int Fd,bool Block)
{
int Flags = fcntl(Fd,F_GETFL) & (~O_NONBLOCK);
if (fcntl(Fd,F_SETFL,Flags | ((Block == false)?0:O_NONBLOCK)) != 0)
{
cerr << "FATAL -> Could not set non-blocking flag " << strerror(errno) << endl;
exit(100);
}
}
/*}}}*/
// WaitFd - Wait for a FD to become readable /*{{{*/
// ---------------------------------------------------------------------
/* 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;
}
/*}}}*/
// MergeKeepFdsFromConfiguration - Merge APT::Keep-Fds configuration /*{{{*/
// ---------------------------------------------------------------------
/* This is used to merge the APT::Keep-Fds with the provided KeepFDs
* set.
*/
void MergeKeepFdsFromConfiguration(std::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);
}
}
}
/*}}}*/
// 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()
{
set<int> KeepFDs;
// we need to merge the Keep-Fds as external tools like
// debconf-apt-progress use it
MergeKeepFdsFromConfiguration(KeepFDs);
return ExecFork(KeepFDs);
}
pid_t ExecFork(std::set<int> KeepFDs)
{
// Fork off the process
pid_t Process = fork();
if (Process < 0)
{
cerr << "FATAL -> Failed to fork." << endl;
exit(100);
}
// 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);
DIR *dir = opendir("/proc/self/fd");
if (dir != NULL)
{
struct dirent *ent;
while ((ent = readdir(dir)))
{
int fd = atoi(ent->d_name);
// If fd > 0, it was a fd number and not . or ..
if (fd >= 3 && KeepFDs.find(fd) == KeepFDs.end())
fcntl(fd,F_SETFD,FD_CLOEXEC);
}
closedir(dir);
} else {
long ScOpenMax = sysconf(_SC_OPEN_MAX);
// Close all of our FDs - just in case
for (int K = 3; K != ScOpenMax; 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;
}
/*}}}*/
// StartsWithGPGClearTextSignature - Check if a file is Pgp/GPG clearsigned /*{{{*/
bool StartsWithGPGClearTextSignature(string const &FileName)
{
FILE* gpg = fopen(FileName.c_str(), "r");
if (gpg == nullptr)
return false;
char * lineptr = nullptr;
size_t n = 0;
errno = 0;
ssize_t const result = getline(&lineptr, &n, gpg);
if (errno != 0)
{
_error->Errno("getline", "Could not read from %s", FileName.c_str());