// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
-// $Id: fileutl.cc,v 1.42 2002/09/14 05:29:22 jgg Exp $
/* ######################################################################
File Utilities
#include <apt-pkg/sptr.h>
#include <apt-pkg/aptconfiguration.h>
#include <apt-pkg/configuration.h>
-
+#include <apt-pkg/macros.h>
+
+#include <ctype.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <sys/select.h>
+#include <time.h>
+#include <string>
+#include <vector>
#include <cstdlib>
#include <cstring>
#include <cstdio>
-
#include <iostream>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
-#include <sys/types.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <dirent.h>
#include <signal.h>
#include <errno.h>
#include <glob.h>
+#include <pwd.h>
+#include <grp.h>
#include <set>
#include <algorithm>
#ifdef HAVE_BZ2
#include <bzlib.h>
#endif
+#ifdef HAVE_LZMA
+ #include <lzma.h>
+#endif
+#include <endian.h>
+#include <stdint.h>
-#ifdef WORDS_BIGENDIAN
-#include <inttypes.h>
+#if __gnu_linux__
+#include <sys/prctl.h>
#endif
#include <apti18n.h>
using namespace std;
-class FileFdPrivate {
- public:
-#ifdef HAVE_ZLIB
- gzFile gz;
-#else
- void* gz;
-#endif
-#ifdef HAVE_BZ2
- BZFILE* bz2;
-#else
- void* bz2;
-#endif
- int compressed_fd;
- pid_t compressor_pid;
- bool pipe;
- APT::Configuration::Compressor compressor;
- unsigned int openmode;
- unsigned long long seekpos;
- FileFdPrivate() : gz(NULL), bz2(NULL),
- compressed_fd(-1), compressor_pid(-1), pipe(false),
- openmode(0), seekpos(0) {};
- bool CloseDown(std::string const &FileName)
- {
- bool Res = true;
-#ifdef HAVE_ZLIB
- if (gz != NULL) {
- int const e = gzclose(gz);
- gz = NULL;
- // gzdclose() on empty files always fails with "buffer error" here, ignore that
- if (e != 0 && e != Z_BUF_ERROR)
- Res &= _error->Errno("close",_("Problem closing the gzip file %s"), FileName.c_str());
- }
-#endif
-#ifdef HAVE_BZ2
- if (bz2 != NULL) {
- BZ2_bzclose(bz2);
- bz2 = NULL;
- }
-#endif
- if (compressor_pid > 0)
- ExecWait(compressor_pid, "FileFdCompressor", true);
- compressor_pid = -1;
-
- return Res;
- }
- ~FileFdPrivate() { CloseDown(""); }
-};
-
// RunScripts - Run a set of scripts from a configuration subtree /*{{{*/
// ---------------------------------------------------------------------
/* */
{
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);
}
/* 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)
+ if (From.IsOpen() == false || To.IsOpen() == false ||
+ From.Failed() == true || To.Failed() == true)
return false;
// Buffered copy between fds
int FD = open(File.c_str(),O_RDWR | O_CREAT | O_NOFOLLOW,0640);
if (FD < 0)
{
- // Read only .. cant have locking problems there.
+ // 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());
}
SetCloseExec(FD,true);
- // Aquire a write lock
+ // Acquire a write lock
struct flock fl;
fl.l_type = F_WRLCK;
fl.l_whence = SEEK_SET;
fl.l_len = 0;
if (fcntl(FD,F_SETLK,&fl) == -1)
{
+ // always close to not leak resources
+ int Tmp = errno;
+ 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)
_error->Errno("open",_("Could not get lock %s"),File.c_str());
- int Tmp = errno;
- close(FD);
- errno = Tmp;
return -1;
}
return false;
// we are not going to create directories "into the blue"
- if (Path.find(Parent, 0) != 0)
+ if (Path.compare(0, Parent.length(), Parent) != 0)
return false;
vector<string> const dirs = VectorizeString(Path.substr(Parent.size()), '/');
const char *C = Ent->d_name;
for (; *C != 0; ++C)
if (isalpha(*C) == 0 && isdigit(*C) == 0
- && *C != '_' && *C != '-') {
+ && *C != '_' && *C != '-' && *C != ':') {
// no required extension -> dot is a bad character
if (*C == '.' && Ext.empty() == false)
continue;
while (1)
{
// Read the link
- int Res;
+ ssize_t Res;
if ((Res = readlink(NFile.c_str(),Buffer,sizeof(Buffer))) <= 0 ||
- (unsigned)Res >= sizeof(Buffer))
+ (size_t)Res >= sizeof(Buffer))
return File;
// Append or replace the previous path
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 failed");
+ return "";
+ }
+ std::string AbsPath(p);
+ free(p);
+ return AbsPath;
+}
+ /*}}}*/
// SetCloseExec - Set the close on exec flag /*{{{*/
// ---------------------------------------------------------------------
/* */
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();
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++)
+ for (int K = 3; K != sysconf(_SC_OPEN_MAX); K++)
{
if(KeepFDs.find(K) == KeepFDs.end())
fcntl(K,F_SETFD,FD_CLOEXEC);
}
/*}}}*/
+
// StartsWithGPGClearTextSignature - Check if a file is Pgp/GPG clearsigned /*{{{*/
// ---------------------------------------------------------------------
/* */
}
+class FileFdPrivate { /*{{{*/
+ public:
+#ifdef HAVE_ZLIB
+ gzFile gz;
+#endif
+#ifdef HAVE_BZ2
+ BZFILE* bz2;
+#endif
+#ifdef HAVE_LZMA
+ struct LZMAFILE {
+ FILE* file;
+ uint8_t buffer[4096];
+ lzma_stream stream;
+ lzma_ret err;
+ bool eof;
+ bool compressing;
+
+ LZMAFILE() : file(NULL), eof(false), compressing(false) { buffer[0] = '\0'; }
+ ~LZMAFILE() {
+ if (compressing == true)
+ {
+ for (;;) {
+ stream.avail_out = sizeof(buffer)/sizeof(buffer[0]);
+ stream.next_out = buffer;
+ err = lzma_code(&stream, LZMA_FINISH);
+ if (err != LZMA_OK && err != LZMA_STREAM_END)
+ {
+ _error->Error("~LZMAFILE: Compress finalisation failed");
+ break;
+ }
+ size_t const n = sizeof(buffer)/sizeof(buffer[0]) - stream.avail_out;
+ if (n && fwrite(buffer, 1, n, file) != n)
+ {
+ _error->Errno("~LZMAFILE",_("Write error"));
+ break;
+ }
+ if (err == LZMA_STREAM_END)
+ break;
+ }
+ }
+ lzma_end(&stream);
+ fclose(file);
+ }
+ };
+ LZMAFILE* lzma;
+#endif
+ int compressed_fd;
+ pid_t compressor_pid;
+ bool pipe;
+ APT::Configuration::Compressor compressor;
+ unsigned int openmode;
+ unsigned long long seekpos;
+ FileFdPrivate() :
+#ifdef HAVE_ZLIB
+ gz(NULL),
+#endif
+#ifdef HAVE_BZ2
+ bz2(NULL),
+#endif
+#ifdef HAVE_LZMA
+ lzma(NULL),
+#endif
+ compressed_fd(-1), compressor_pid(-1), pipe(false),
+ openmode(0), seekpos(0) {};
+ bool InternalClose(std::string const &FileName)
+ {
+ if (false)
+ /* dummy so that the rest can be 'else if's */;
+#ifdef HAVE_ZLIB
+ else if (gz != NULL) {
+ int const e = gzclose(gz);
+ gz = NULL;
+ // gzdclose() on empty files always fails with "buffer error" here, ignore that
+ if (e != 0 && e != Z_BUF_ERROR)
+ return _error->Errno("close",_("Problem closing the gzip file %s"), FileName.c_str());
+ }
+#endif
+#ifdef HAVE_BZ2
+ else if (bz2 != NULL) {
+ BZ2_bzclose(bz2);
+ bz2 = NULL;
+ }
+#endif
+#ifdef HAVE_LZMA
+ else if (lzma != NULL) {
+ delete lzma;
+ lzma = NULL;
+ }
+#endif
+ return true;
+ }
+ bool CloseDown(std::string const &FileName)
+ {
+ bool const Res = InternalClose(FileName);
+
+ if (compressor_pid > 0)
+ ExecWait(compressor_pid, "FileFdCompressor", true);
+ compressor_pid = -1;
+
+ return Res;
+ }
+ bool InternalStream() const {
+ return false
+#ifdef HAVE_BZ2
+ || bz2 != NULL
+#endif
+#ifdef HAVE_LZMA
+ || lzma != NULL
+#endif
+ ;
+ }
+
+
+ ~FileFdPrivate() { CloseDown(""); }
+};
+ /*}}}*/
// FileFd::Open - Open a file /*{{{*/
// ---------------------------------------------------------------------
/* The most commonly used open mode combinations are given with Mode */
-bool FileFd::Open(string FileName,unsigned int const Mode,CompressMode Compress, unsigned long const Perms)
+bool FileFd::Open(string FileName,unsigned int const Mode,CompressMode Compress, unsigned long const AccessMode)
{
if (Mode == ReadOnlyGzip)
- return Open(FileName, ReadOnly, Gzip, Perms);
+ return Open(FileName, ReadOnly, Gzip, AccessMode);
if (Compress == Auto && (Mode & WriteOnly) == WriteOnly)
- return _error->Error("Autodetection on %s only works in ReadOnly openmode!", FileName.c_str());
+ return FileFdError("Autodetection on %s only works in ReadOnly openmode!", FileName.c_str());
std::vector<APT::Configuration::Compressor> const compressors = APT::Configuration::getCompressors();
std::vector<APT::Configuration::Compressor>::const_iterator compressor = compressors.begin();
{
for (; compressor != compressors.end(); ++compressor)
{
- std::string file = std::string(FileName).append(compressor->Extension);
+ std::string file = FileName + compressor->Extension;
if (FileExists(file) == false)
continue;
FileName = file;
case Auto:
case Extension:
// Unreachable
- return _error->Error("Opening File %s in None, Auto or Extension should be already handled?!?", FileName.c_str());
+ return FileFdError("Opening File %s in None, Auto or Extension should be already handled?!?", FileName.c_str());
}
for (; compressor != compressors.end(); ++compressor)
if (compressor->Name == name)
break;
if (compressor == compressors.end())
- return _error->Error("Can't find a configured compressor %s for file %s", name.c_str(), FileName.c_str());
+ return FileFdError("Can't find a configured compressor %s for file %s", name.c_str(), FileName.c_str());
}
if (compressor == compressors.end())
- return _error->Error("Can't find a match for specified compressor mode for file %s", FileName.c_str());
- return Open(FileName, Mode, *compressor, Perms);
+ return FileFdError("Can't find a match for specified compressor mode for file %s", FileName.c_str());
+ return Open(FileName, Mode, *compressor, AccessMode);
}
-bool FileFd::Open(string FileName,unsigned int const Mode,APT::Configuration::Compressor const &compressor, unsigned long const Perms)
+bool FileFd::Open(string FileName,unsigned int const Mode,APT::Configuration::Compressor const &compressor, unsigned long const AccessMode)
{
Close();
Flags = AutoClose;
if ((Mode & WriteOnly) != WriteOnly && (Mode & (Atomic | Create | Empty | Exclusive)) != 0)
- return _error->Error("ReadOnly mode for %s doesn't accept additional flags!", FileName.c_str());
+ return FileFdError("ReadOnly mode for %s doesn't accept additional flags!", FileName.c_str());
if ((Mode & ReadWrite) == 0)
- return _error->Error("No openmode provided in FileFd::Open for %s", FileName.c_str());
+ return FileFdError("No openmode provided in FileFd::Open for %s", FileName.c_str());
if ((Mode & Atomic) == Atomic)
{
Flags |= Replace;
- char *name = strdup((FileName + ".XXXXXX").c_str());
- TemporaryFileName = string(mktemp(name));
- free(name);
}
else if ((Mode & (Exclusive | Create)) == (Exclusive | Create))
{
if_FLAGGED_SET(Create, O_CREAT);
if_FLAGGED_SET(Empty, O_TRUNC);
if_FLAGGED_SET(Exclusive, O_EXCL);
- else if_FLAGGED_SET(Atomic, O_EXCL);
#undef if_FLAGGED_SET
- if (TemporaryFileName.empty() == false)
- iFd = open(TemporaryFileName.c_str(), fileflags, Perms);
+ if ((Mode & Atomic) == Atomic)
+ {
+ char *name = strdup((FileName + ".XXXXXX").c_str());
+
+ if((iFd = mkstemp(name)) == -1)
+ {
+ free(name);
+ return FileFdErrno("mkstemp", "Could not create temporary file for %s", FileName.c_str());
+ }
+
+ TemporaryFileName = string(name);
+ free(name);
+
+ // umask() will always set the umask and return the previous value, so
+ // we first set the umask and then reset it to the old value
+ mode_t const CurrentUmask = umask(0);
+ umask(CurrentUmask);
+ // calculate the actual file permissions (just like open/creat)
+ mode_t const FilePermissions = (AccessMode & ~CurrentUmask);
+
+ if(fchmod(iFd, FilePermissions) == -1)
+ return FileFdErrno("fchmod", "Could not change permissions for temporary file %s", TemporaryFileName.c_str());
+ }
else
- iFd = open(FileName.c_str(), fileflags, Perms);
+ iFd = open(FileName.c_str(), fileflags, AccessMode);
this->FileName = FileName;
if (iFd == -1 || OpenInternDescriptor(Mode, compressor) == false)
close (iFd);
iFd = -1;
}
- return _error->Errno("open",_("Could not open file %s"), FileName.c_str());
+ return FileFdErrno("open",_("Could not open file %s"), FileName.c_str());
}
SetCloseExec(iFd,true);
case Xz: name = "xz"; break;
case Auto:
case Extension:
- return _error->Error("Opening Fd %d in Auto or Extension compression mode is not supported", Fd);
+ if (AutoClose == true && Fd != -1)
+ close(Fd);
+ return FileFdError("Opening Fd %d in Auto or Extension compression mode is not supported", Fd);
}
for (; compressor != compressors.end(); ++compressor)
if (compressor->Name == name)
break;
if (compressor == compressors.end())
- return _error->Error("Can't find a configured compressor %s for file %s", name.c_str(), FileName.c_str());
-
+ {
+ if (AutoClose == true && Fd != -1)
+ close(Fd);
+ return FileFdError("Can't find a configured compressor %s for file %s", name.c_str(), FileName.c_str());
+ }
return OpenDescriptor(Fd, Mode, *compressor, AutoClose);
}
bool FileFd::OpenDescriptor(int Fd, unsigned int const Mode, APT::Configuration::Compressor const &compressor, bool AutoClose)
{
Close();
Flags = (AutoClose) ? FileFd::AutoClose : 0;
- if (AutoClose == false && (
-#ifdef HAVE_ZLIB
- compressor.Name == "gzip" ||
-#endif
-#ifdef HAVE_BZ2
- compressor.Name == "bzip2" ||
-#endif
- false))
- {
- // Need to duplicate fd here or gzclose for cleanup will close the fd as well
- iFd = dup(Fd);
- }
- else
- iFd = Fd;
+ iFd = Fd;
this->FileName = "";
if (OpenInternDescriptor(Mode, compressor) == false)
{
- if (AutoClose)
+ if (iFd != -1 && (
+ (Flags & Compressed) == Compressed ||
+ AutoClose == true))
+ {
close (iFd);
- return _error->Errno("gzdopen",_("Could not open file descriptor %d"), Fd);
+ iFd = -1;
+ }
+ return FileFdError(_("Could not open file descriptor %d"), Fd);
}
return true;
}
bool FileFd::OpenInternDescriptor(unsigned int const Mode, APT::Configuration::Compressor const &compressor)
{
+ if (iFd == -1)
+ return false;
if (compressor.Name == "." || compressor.Binary.empty() == true)
return true;
+#if defined HAVE_ZLIB || defined HAVE_BZ2 || defined HAVE_LZMA
+ // the API to open files is similar, so setup to avoid code duplicates later
+ // and while at it ensure that we close before opening (if its a reopen)
+ void* (*compress_open)(int, const char *) = NULL;
+ if (false)
+ /* dummy so that the rest can be 'else if's */;
+#define APT_COMPRESS_INIT(NAME,OPEN) \
+ else if (compressor.Name == NAME) \
+ { \
+ compress_open = (void*(*)(int, const char *)) OPEN; \
+ if (d != NULL) d->InternalClose(FileName); \
+ }
+#ifdef HAVE_ZLIB
+ APT_COMPRESS_INIT("gzip", gzdopen)
+#endif
+#ifdef HAVE_BZ2
+ APT_COMPRESS_INIT("bzip2", BZ2_bzdopen)
+#endif
+#ifdef HAVE_LZMA
+ APT_COMPRESS_INIT("xz", fdopen)
+ APT_COMPRESS_INIT("lzma", fdopen)
+#endif
+#undef APT_COMPRESS_INIT
+#endif
+
if (d == NULL)
{
d = new FileFdPrivate();
d->openmode = Mode;
d->compressor = compressor;
+#if defined HAVE_ZLIB || defined HAVE_BZ2 || defined HAVE_LZMA
+ if ((Flags & AutoClose) != AutoClose && compress_open != NULL)
+ {
+ // Need to duplicate fd here or gz/bz2 close for cleanup will close the fd as well
+ int const internFd = dup(iFd);
+ if (internFd == -1)
+ return FileFdErrno("OpenInternDescriptor", _("Could not open file descriptor %d"), iFd);
+ iFd = internFd;
+ }
+#endif
}
-#ifdef HAVE_ZLIB
- if (compressor.Name == "gzip")
+#if defined HAVE_ZLIB || defined HAVE_BZ2 || defined HAVE_LZMA
+ if (compress_open != NULL)
{
- if (d->gz != NULL)
- {
- gzclose(d->gz);
- d->gz = NULL;
- }
+ void* compress_struct = NULL;
if ((Mode & ReadWrite) == ReadWrite)
- d->gz = gzdopen(iFd, "r+");
+ compress_struct = compress_open(iFd, "r+");
else if ((Mode & WriteOnly) == WriteOnly)
- d->gz = gzdopen(iFd, "w");
+ compress_struct = compress_open(iFd, "w");
else
- d->gz = gzdopen(iFd, "r");
- if (d->gz == NULL)
+ compress_struct = compress_open(iFd, "r");
+ if (compress_struct == NULL)
return false;
- Flags |= Compressed;
- return true;
- }
+
+ if (false)
+ /* dummy so that the rest can be 'else if's */;
+#ifdef HAVE_ZLIB
+ else if (compressor.Name == "gzip")
+ d->gz = (gzFile) compress_struct;
#endif
#ifdef HAVE_BZ2
- if (compressor.Name == "bzip2")
- {
- if (d->bz2 != NULL)
+ else if (compressor.Name == "bzip2")
+ d->bz2 = (BZFILE*) compress_struct;
+#endif
+#ifdef HAVE_LZMA
+ else if (compressor.Name == "xz" || compressor.Name == "lzma")
{
- BZ2_bzclose(d->bz2);
- d->bz2 = NULL;
+ uint32_t const xzlevel = 6;
+ uint64_t const memlimit = UINT64_MAX;
+ if (d->lzma == NULL)
+ d->lzma = new FileFdPrivate::LZMAFILE;
+ d->lzma->file = (FILE*) compress_struct;
+ lzma_stream tmp_stream = LZMA_STREAM_INIT;
+ d->lzma->stream = tmp_stream;
+
+ if ((Mode & ReadWrite) == ReadWrite)
+ return FileFdError("ReadWrite mode is not supported for file %s", FileName.c_str());
+
+ if ((Mode & WriteOnly) == WriteOnly)
+ {
+ if (compressor.Name == "xz")
+ {
+ if (lzma_easy_encoder(&d->lzma->stream, xzlevel, LZMA_CHECK_CRC32) != LZMA_OK)
+ return false;
+ }
+ else
+ {
+ lzma_options_lzma options;
+ lzma_lzma_preset(&options, xzlevel);
+ if (lzma_alone_encoder(&d->lzma->stream, &options) != LZMA_OK)
+ return false;
+ }
+ d->lzma->compressing = true;
+ }
+ else
+ {
+ if (compressor.Name == "xz")
+ {
+ if (lzma_auto_decoder(&d->lzma->stream, memlimit, 0) != LZMA_OK)
+ return false;
+ }
+ else
+ {
+ if (lzma_alone_decoder(&d->lzma->stream, memlimit) != LZMA_OK)
+ return false;
+ }
+ d->lzma->compressing = false;
+ }
}
- if ((Mode & ReadWrite) == ReadWrite)
- d->bz2 = BZ2_bzdopen(iFd, "r+");
- else if ((Mode & WriteOnly) == WriteOnly)
- d->bz2 = BZ2_bzdopen(iFd, "w");
- else
- d->bz2 = BZ2_bzdopen(iFd, "r");
- if (d->bz2 == NULL)
- return false;
+#endif
Flags |= Compressed;
return true;
}
ExecWait(d->compressor_pid, "FileFdCompressor", true);
if ((Mode & ReadWrite) == ReadWrite)
- {
- Flags |= Fail;
- return _error->Error("ReadWrite mode is not supported for file %s", FileName.c_str());
- }
+ return FileFdError("ReadWrite mode is not supported for file %s", FileName.c_str());
bool const Comp = (Mode & WriteOnly) == WriteOnly;
if (Comp == false)
// Create a data pipe
int Pipe[2] = {-1,-1};
if (pipe(Pipe) != 0)
- {
- Flags |= Fail;
- return _error->Errno("pipe",_("Failed to create subprocess IPC"));
- }
+ return FileFdErrno("pipe",_("Failed to create subprocess IPC"));
for (int J = 0; J != 2; J++)
SetCloseExec(Pipe[J],true);
}
else
{
- if (FileName.empty() == true)
+ if (d->compressed_fd != -1)
dup2(d->compressed_fd,STDIN_FILENO);
dup2(Pipe[1],STDOUT_FILENO);
}
Args.push_back(a->c_str());
if (Comp == false && FileName.empty() == false)
{
- Args.push_back("--stdout");
+ // commands not needing arguments, do not need to be told about using standard output
+ // in reality, only testcases with tools like cat, rev, rot13, … are able to trigger this
+ if (compressor.CompressArgs.empty() == false && compressor.UncompressArgs.empty() == false)
+ Args.push_back("--stdout");
if (TemporaryFileName.empty() == false)
Args.push_back(TemporaryFileName.c_str());
else
{
Close();
if (d != NULL)
- {
d->CloseDown(FileName);
- delete d;
- d = NULL;
- }
+ delete d;
+ d = NULL;
}
/*}}}*/
// FileFd::Read - Read a bit of the file /*{{{*/
// ---------------------------------------------------------------------
-/* We are carefull to handle interruption by a signal while reading
+/* We are careful to handle interruption by a signal while reading
gracefully. */
bool FileFd::Read(void *To,unsigned long long Size,unsigned long long *Actual)
{
- int Res;
+ ssize_t Res;
errno = 0;
if (Actual != 0)
*Actual = 0;
*((char *)To) = '\0';
do
{
+ if (false)
+ /* dummy so that the rest can be 'else if's */;
#ifdef HAVE_ZLIB
- if (d != NULL && d->gz != NULL)
+ else if (d != NULL && d->gz != NULL)
Res = gzread(d->gz,To,Size);
- else
#endif
#ifdef HAVE_BZ2
- if (d != NULL && d->bz2 != NULL)
+ else if (d != NULL && d->bz2 != NULL)
Res = BZ2_bzread(d->bz2,To,Size);
- else
#endif
+#ifdef HAVE_LZMA
+ else if (d != NULL && d->lzma != NULL)
+ {
+ if (d->lzma->eof == true)
+ break;
+
+ d->lzma->stream.next_out = (uint8_t *) To;
+ d->lzma->stream.avail_out = Size;
+ if (d->lzma->stream.avail_in == 0)
+ {
+ d->lzma->stream.next_in = d->lzma->buffer;
+ d->lzma->stream.avail_in = fread(d->lzma->buffer, 1, sizeof(d->lzma->buffer)/sizeof(d->lzma->buffer[0]), d->lzma->file);
+ }
+ d->lzma->err = lzma_code(&d->lzma->stream, LZMA_RUN);
+ if (d->lzma->err == LZMA_STREAM_END)
+ {
+ d->lzma->eof = true;
+ Res = Size - d->lzma->stream.avail_out;
+ }
+ else if (d->lzma->err != LZMA_OK)
+ {
+ Res = -1;
+ errno = 0;
+ }
+ else
+ {
+ Res = Size - d->lzma->stream.avail_out;
+ if (Res == 0)
+ {
+ // lzma run was okay, but produced no output…
+ Res = -1;
+ errno = EINTR;
+ }
+ }
+ }
+#endif
+ else
Res = read(iFd,To,Size);
if (Res < 0)
{
if (errno == EINTR)
+ {
+ // trick the while-loop into running again
+ Res = 1;
+ errno = 0;
continue;
- Flags |= Fail;
+ }
+ if (false)
+ /* dummy so that the rest can be 'else if's */;
#ifdef HAVE_ZLIB
- if (d != NULL && d->gz != NULL)
+ else if (d != NULL && d->gz != NULL)
{
int err;
char const * const errmsg = gzerror(d->gz, &err);
if (err != Z_ERRNO)
- return _error->Error("gzread: %s (%d: %s)", _("Read error"), err, errmsg);
+ return FileFdError("gzread: %s (%d: %s)", _("Read error"), err, errmsg);
}
#endif
#ifdef HAVE_BZ2
- if (d != NULL && d->bz2 != NULL)
+ else if (d != NULL && d->bz2 != NULL)
{
int err;
char const * const errmsg = BZ2_bzerror(d->bz2, &err);
if (err != BZ_IO_ERROR)
- return _error->Error("BZ2_bzread: %s (%d: %s)", _("Read error"), err, errmsg);
+ return FileFdError("BZ2_bzread: %s %s (%d: %s)", FileName.c_str(), _("Read error"), err, errmsg);
}
#endif
- return _error->Errno("read",_("Read error"));
+#ifdef HAVE_LZMA
+ else if (d != NULL && d->lzma != NULL)
+ return FileFdError("lzma_read: %s (%d)", _("Read error"), d->lzma->err);
+#endif
+ return FileFdErrno("read",_("Read error"));
}
To = (char *)To + Res;
Flags |= HitEof;
return true;
}
-
- Flags |= Fail;
- return _error->Error(_("read, still have %llu to read but none left"), Size);
+
+ return FileFdError(_("read, still have %llu to read but none left"), Size);
}
/*}}}*/
// FileFd::ReadLine - Read a complete line from the file /*{{{*/
/* */
bool FileFd::Write(const void *From,unsigned long long Size)
{
- int Res;
+ ssize_t Res;
errno = 0;
do
{
+ if (false)
+ /* dummy so that the rest can be 'else if's */;
#ifdef HAVE_ZLIB
- if (d != NULL && d->gz != NULL)
- Res = gzwrite(d->gz,From,Size);
- else
+ else if (d != NULL && d->gz != NULL)
+ Res = gzwrite(d->gz,From,Size);
#endif
#ifdef HAVE_BZ2
- if (d != NULL && d->bz2 != NULL)
- Res = BZ2_bzwrite(d->bz2,(void*)From,Size);
- else
+ else if (d != NULL && d->bz2 != NULL)
+ Res = BZ2_bzwrite(d->bz2,(void*)From,Size);
+#endif
+#ifdef HAVE_LZMA
+ else if (d != NULL && d->lzma != NULL)
+ {
+ d->lzma->stream.next_in = (uint8_t *)From;
+ d->lzma->stream.avail_in = Size;
+ d->lzma->stream.next_out = d->lzma->buffer;
+ d->lzma->stream.avail_out = sizeof(d->lzma->buffer)/sizeof(d->lzma->buffer[0]);
+ d->lzma->err = lzma_code(&d->lzma->stream, LZMA_RUN);
+ if (d->lzma->err != LZMA_OK)
+ return false;
+ size_t const n = sizeof(d->lzma->buffer)/sizeof(d->lzma->buffer[0]) - d->lzma->stream.avail_out;
+ size_t const m = (n == 0) ? 0 : fwrite(d->lzma->buffer, 1, n, d->lzma->file);
+ if (m != n)
+ Res = -1;
+ else
+ Res = Size - d->lzma->stream.avail_in;
+ }
#endif
- Res = write(iFd,From,Size);
+ else
+ Res = write(iFd,From,Size);
+
if (Res < 0 && errno == EINTR)
continue;
if (Res < 0)
{
- Flags |= Fail;
+ if (false)
+ /* dummy so that the rest can be 'else if's */;
#ifdef HAVE_ZLIB
- if (d != NULL && d->gz != NULL)
+ else if (d != NULL && d->gz != NULL)
{
int err;
char const * const errmsg = gzerror(d->gz, &err);
if (err != Z_ERRNO)
- return _error->Error("gzwrite: %s (%d: %s)", _("Write error"), err, errmsg);
+ return FileFdError("gzwrite: %s (%d: %s)", _("Write error"), err, errmsg);
}
#endif
#ifdef HAVE_BZ2
- if (d != NULL && d->bz2 != NULL)
+ else if (d != NULL && d->bz2 != NULL)
{
int err;
char const * const errmsg = BZ2_bzerror(d->bz2, &err);
if (err != BZ_IO_ERROR)
- return _error->Error("BZ2_bzwrite: %s (%d: %s)", _("Write error"), err, errmsg);
+ return FileFdError("BZ2_bzwrite: %s (%d: %s)", _("Write error"), err, errmsg);
}
#endif
- return _error->Errno("write",_("Write error"));
+#ifdef HAVE_LZMA
+ else if (d != NULL && d->lzma != NULL)
+ return FileFdErrno("lzma_fwrite", _("Write error"));
+#endif
+ return FileFdErrno("write",_("Write error"));
}
- From = (char *)From + Res;
+ From = (char const *)From + Res;
Size -= Res;
if (d != NULL)
d->seekpos += Res;
if (Size == 0)
return true;
-
- Flags |= Fail;
- return _error->Error(_("write, still have %llu to write but couldn't"), Size);
+
+ return FileFdError(_("write, still have %llu to write but couldn't"), Size);
}
bool FileFd::Write(int Fd, const void *From, unsigned long long Size)
{
- int Res;
+ ssize_t Res;
errno = 0;
do
{
if (Res < 0)
return _error->Errno("write",_("Write error"));
- From = (char *)From + Res;
+ From = (char const *)From + Res;
Size -= Res;
}
while (Res > 0 && Size > 0);
/* */
bool FileFd::Seek(unsigned long long To)
{
- if (d != NULL && (d->pipe == true
-#ifdef HAVE_BZ2
- || d->bz2 != NULL
-#endif
- ))
+ Flags &= ~HitEof;
+
+ if (d != NULL && (d->pipe == true || d->InternalStream() == true))
{
// Our poor man seeking in pipes is costly, so try to avoid it
unsigned long long seekpos = Tell();
return Skip(To - seekpos);
if ((d->openmode & ReadOnly) != ReadOnly)
- {
- Flags |= Fail;
- return _error->Error("Reopen is only implemented for read-only files!");
- }
-#ifdef HAVE_BZ2
- if (d->bz2 != NULL)
- BZ2_bzclose(d->bz2);
-#endif
+ return FileFdError("Reopen is only implemented for read-only files!");
+ d->InternalClose(FileName);
if (iFd != -1)
close(iFd);
iFd = -1;
if (lseek(d->compressed_fd, 0, SEEK_SET) != 0)
iFd = d->compressed_fd;
if (iFd < 0)
- {
- Flags |= Fail;
- return _error->Error("Reopen is not implemented for pipes opened with FileFd::OpenDescriptor()!");
- }
+ return FileFdError("Reopen is not implemented for pipes opened with FileFd::OpenDescriptor()!");
}
if (OpenInternDescriptor(d->openmode, d->compressor) == false)
- {
- Flags |= Fail;
- return _error->Error("Seek on file %s because it couldn't be reopened", FileName.c_str());
- }
+ return FileFdError("Seek on file %s because it couldn't be reopened", FileName.c_str());
if (To != 0)
return Skip(To);
d->seekpos = To;
return true;
}
- int res;
+ off_t res;
#ifdef HAVE_ZLIB
if (d != NULL && d->gz)
res = gzseek(d->gz,To,SEEK_SET);
else
#endif
res = lseek(iFd,To,SEEK_SET);
- if (res != (signed)To)
- {
- Flags |= Fail;
- return _error->Error("Unable to seek to %llu", To);
- }
+ if (res != (off_t)To)
+ return FileFdError("Unable to seek to %llu", To);
if (d != NULL)
d->seekpos = To;
/* */
bool FileFd::Skip(unsigned long long Over)
{
- if (d != NULL && (d->pipe == true
-#ifdef HAVE_BZ2
- || d->bz2 != NULL
-#endif
- ))
+ if (d != NULL && (d->pipe == true || d->InternalStream() == true))
{
- d->seekpos += Over;
char buffer[1024];
while (Over != 0)
{
unsigned long long toread = std::min((unsigned long long) sizeof(buffer), Over);
if (Read(buffer, toread) == false)
- {
- Flags |= Fail;
- return _error->Error("Unable to seek ahead %llu",Over);
- }
+ return FileFdError("Unable to seek ahead %llu",Over);
Over -= toread;
}
return true;
}
- int res;
+ off_t res;
#ifdef HAVE_ZLIB
if (d != NULL && d->gz != NULL)
res = gzseek(d->gz,Over,SEEK_CUR);
#endif
res = lseek(iFd,Over,SEEK_CUR);
if (res < 0)
- {
- Flags |= Fail;
- return _error->Error("Unable to seek ahead %llu",Over);
- }
+ return FileFdError("Unable to seek ahead %llu",Over);
if (d != NULL)
d->seekpos = res;
/* */
bool FileFd::Truncate(unsigned long long To)
{
-#if defined HAVE_ZLIB || defined HAVE_BZ2
- if (d != NULL && (d->gz != NULL || d->bz2 != NULL))
- {
- Flags |= Fail;
- return _error->Error("Truncating compressed files is not implemented (%s)", FileName.c_str());
- }
+ // truncating /dev/null is always successful - as we get an error otherwise
+ if (To == 0 && FileName == "/dev/null")
+ return true;
+#if defined HAVE_ZLIB || defined HAVE_BZ2 || defined HAVE_LZMA
+ if (d != NULL && (d->InternalStream() == true
+#ifdef HAVE_ZLIB
+ || d->gz != NULL
+#endif
+ ))
+ return FileFdError("Truncating compressed files is not implemented (%s)", FileName.c_str());
#endif
if (ftruncate(iFd,To) != 0)
- {
- Flags |= Fail;
- return _error->Error("Unable to truncate to %llu",To);
- }
-
+ return FileFdError("Unable to truncate to %llu",To);
+
return true;
}
/*}}}*/
// seeking around, but not all users of FileFd use always Seek() and co
// so d->seekpos isn't always true and we can just use it as a hint if
// we have nothing else, but not always as an authority…
- if (d != NULL && (d->pipe == true
-#ifdef HAVE_BZ2
- || d->bz2 != NULL
-#endif
- ))
+ if (d != NULL && (d->pipe == true || d->InternalStream() == true))
return d->seekpos;
off_t Res;
#endif
Res = lseek(iFd,0,SEEK_CUR);
if (Res == (off_t)-1)
- {
- Flags |= Fail;
- _error->Errno("lseek","Failed to determine the current file position");
- }
+ FileFdErrno("lseek","Failed to determine the current file position");
if (d != NULL)
d->seekpos = Res;
return Res;
}
/*}}}*/
-// FileFd::FileSize - Return the size of the file /*{{{*/
-// ---------------------------------------------------------------------
-/* */
-unsigned long long FileFd::FileSize()
+static bool StatFileFd(char const * const msg, int const iFd, std::string const &FileName, struct stat &Buf, FileFdPrivate * const d) /*{{{*/
{
- struct stat Buf;
- if ((d == NULL || d->pipe == false) && fstat(iFd,&Buf) != 0)
+ bool ispipe = (d != NULL && d->pipe == true);
+ if (ispipe == false)
{
- Flags |= Fail;
- return _error->Errno("fstat","Unable to determine the file size");
+ if (fstat(iFd,&Buf) != 0)
+ // higher-level code will generate more meaningful messages,
+ // even translated this would be meaningless for users
+ return _error->Errno("fstat", "Unable to determine %s for fd %i", msg, iFd);
+ if (FileName.empty() == false)
+ ispipe = S_ISFIFO(Buf.st_mode);
}
// for compressor pipes st_size is undefined and at 'best' zero
- if ((d != NULL && d->pipe == true) || S_ISFIFO(Buf.st_mode))
+ if (ispipe == true)
{
// we set it here, too, as we get the info here for free
// in theory the Open-methods should take care of it already
if (d != NULL)
d->pipe = true;
if (stat(FileName.c_str(), &Buf) != 0)
- {
- Flags |= Fail;
- return _error->Errno("stat","Unable to determine the file size");
- }
+ return _error->Errno("fstat", "Unable to determine %s for file %s", msg, FileName.c_str());
+ }
+ return true;
+}
+ /*}}}*/
+// FileFd::FileSize - Return the size of the file /*{{{*/
+unsigned long long FileFd::FileSize()
+{
+ struct stat Buf;
+ if (StatFileFd("file size", iFd, FileName, Buf, d) == false)
+ {
+ Flags |= Fail;
+ return 0;
}
-
return Buf.st_size;
}
/*}}}*/
+// FileFd::ModificationTime - Return the time of last touch /*{{{*/
+time_t FileFd::ModificationTime()
+{
+ struct stat Buf;
+ if (StatFileFd("modification time", iFd, FileName, Buf, d) == false)
+ {
+ Flags |= Fail;
+ return 0;
+ }
+ return Buf.st_mtime;
+}
+ /*}}}*/
// FileFd::Size - Return the size of the content in the file /*{{{*/
// ---------------------------------------------------------------------
/* */
// for compressor pipes st_size is undefined and at 'best' zero,
// so we 'read' the content and 'seek' back - see there
- if (d != NULL && (d->pipe == true
-#ifdef HAVE_BZ2
- || (d->bz2 && size > 0)
-#endif
- ))
+ if (d != NULL && (d->pipe == true || (d->InternalStream() == true && size > 0)))
{
unsigned long long const oldSeek = Tell();
char ignore[1000];
unsigned long long read = 0;
do {
- Read(ignore, sizeof(ignore), &read);
+ if (Read(ignore, sizeof(ignore), &read) == false)
+ {
+ Seek(oldSeek);
+ return 0;
+ }
} while(read != 0);
size = Tell();
Seek(oldSeek);
// FIXME: Size for gz-files is limited by 32bit… no largefile support
if (lseek(iFd, -4, SEEK_END) < 0)
{
- Flags |= Fail;
- return _error->Errno("lseek","Unable to seek to end of gzipped file");
+ FileFdErrno("lseek","Unable to seek to end of gzipped file");
+ return 0;
}
- size = 0L;
+ uint32_t size = 0;
if (read(iFd, &size, 4) != 4)
{
- Flags |= Fail;
- return _error->Errno("read","Unable to read original size of gzipped file");
+ FileFdErrno("read","Unable to read original size of gzipped file");
+ return 0;
}
-
-#ifdef WORDS_BIGENDIAN
- uint32_t tmp_size = size;
- uint8_t const * const p = (uint8_t const * const) &tmp_size;
- tmp_size = (p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0];
- size = tmp_size;
-#endif
+ size = le32toh(size);
if (lseek(iFd, oldPos, SEEK_SET) < 0)
{
- Flags |= Fail;
- return _error->Errno("lseek","Unable to seek in gzipped file");
+ FileFdErrno("lseek","Unable to seek in gzipped file");
+ return 0;
}
return size;
return size;
}
/*}}}*/
-// FileFd::ModificationTime - Return the time of last touch /*{{{*/
-// ---------------------------------------------------------------------
-/* */
-time_t FileFd::ModificationTime()
-{
- struct stat Buf;
- if ((d == NULL || d->pipe == false) && fstat(iFd,&Buf) != 0)
- {
- Flags |= Fail;
- _error->Errno("fstat","Unable to determine the modification time of file %s", FileName.c_str());
- return 0;
- }
-
- // for compressor pipes st_size is undefined and at 'best' zero
- if ((d != NULL && d->pipe == true) || S_ISFIFO(Buf.st_mode))
- {
- // we set it here, too, as we get the info here for free
- // in theory the Open-methods should take care of it already
- if (d != NULL)
- d->pipe = true;
- if (stat(FileName.c_str(), &Buf) != 0)
- {
- Flags |= Fail;
- _error->Errno("fstat","Unable to determine the modification time of file %s", FileName.c_str());
- return 0;
- }
- }
-
- return Buf.st_mtime;
-}
- /*}}}*/
// FileFd::Close - Close the file if the close flag is set /*{{{*/
// ---------------------------------------------------------------------
/* */
{
if ((Flags & Compressed) != Compressed && iFd > 0 && close(iFd) != 0)
Res &= _error->Errno("close",_("Problem closing the file %s"), FileName.c_str());
-
if (d != NULL)
{
Res &= d->CloseDown(FileName);
bool FileFd::Sync()
{
if (fsync(iFd) != 0)
+ return FileFdErrno("sync",_("Problem syncing the file"));
+ return true;
+}
+ /*}}}*/
+// FileFd::FileFdErrno - set Fail and call _error->Errno *{{{*/
+bool FileFd::FileFdErrno(const char *Function, const char *Description,...)
+{
+ Flags |= Fail;
+ va_list args;
+ size_t msgSize = 400;
+ int const errsv = errno;
+ while (true)
{
- Flags |= Fail;
- return _error->Errno("sync",_("Problem syncing the file"));
+ va_start(args,Description);
+ if (_error->InsertErrno(GlobalError::ERROR, Function, Description, args, errsv, msgSize) == false)
+ break;
+ va_end(args);
}
- return true;
+ return false;
+}
+ /*}}}*/
+// FileFd::FileFdError - set Fail and call _error->Error *{{{*/
+bool FileFd::FileFdError(const char *Description,...) {
+ Flags |= Fail;
+ va_list args;
+ size_t msgSize = 400;
+ while (true)
+ {
+ va_start(args,Description);
+ if (_error->Insert(GlobalError::ERROR, Description, args, msgSize) == false)
+ break;
+ va_end(args);
+ }
+ return false;
}
/*}}}*/
-gzFile FileFd::gzFd() { return (gzFile) d->gz; }
+APT_DEPRECATED gzFile FileFd::gzFd() {
+#ifdef HAVE_ZLIB
+ return d->gz;
+#else
+ return NULL;
+#endif
+}
// Glob - wrapper around "glob()" /*{{{*/
{
std::vector<std::string> result;
glob_t globbuf;
- int glob_res, i;
+ int glob_res;
+ unsigned int i;
glob_res = glob(pattern.c_str(), flags, NULL, &globbuf);
return result;
}
/*}}}*/
+
+std::string GetTempDir()
+{
+ const char *tmpdir = getenv("TMPDIR");
+
+#ifdef P_tmpdir
+ if (!tmpdir)
+ tmpdir = P_tmpdir;
+#endif
+
+ // check that tmpdir is set and exists
+ struct stat st;
+ if (!tmpdir || strlen(tmpdir) == 0 || stat(tmpdir, &st) != 0)
+ tmpdir = "/tmp";
+
+ return string(tmpdir);
+}
+
+FileFd* GetTempFile(std::string const &Prefix, bool ImmediateUnlink)
+{
+ char fn[512];
+ FileFd *Fd = new FileFd();
+
+ std::string tempdir = GetTempDir();
+ snprintf(fn, sizeof(fn), "%s/%s.XXXXXX",
+ tempdir.c_str(), Prefix.c_str());
+ int fd = mkstemp(fn);
+ if(ImmediateUnlink)
+ unlink(fn);
+ if (fd < 0)
+ {
+ _error->Errno("GetTempFile",_("Unable to mkstemp %s"), fn);
+ return NULL;
+ }
+ if (!Fd->OpenDescriptor(fd, FileFd::WriteOnly, FileFd::None, true))
+ {
+ _error->Errno("GetTempFile",_("Unable to write to %s"),fn);
+ return NULL;
+ }
+
+ return Fd;
+}
+
+bool Rename(std::string From, std::string To)
+{
+ if (rename(From.c_str(),To.c_str()) != 0)
+ {
+ _error->Error(_("rename failed, %s (%s -> %s)."),strerror(errno),
+ From.c_str(),To.c_str());
+ return false;
+ }
+ return true;
+}
+
+bool Popen(const char* Args[], FileFd &Fd, pid_t &Child, FileFd::OpenMode Mode)
+{
+ int fd;
+ if (Mode != FileFd::ReadOnly && Mode != FileFd::WriteOnly)
+ return _error->Error("Popen supports ReadOnly (x)or WriteOnly mode only");
+
+ int Pipe[2] = {-1, -1};
+ if(pipe(Pipe) != 0)
+ return _error->Errno("pipe", _("Failed to create subprocess IPC"));
+
+ std::set<int> keep_fds;
+ keep_fds.insert(Pipe[0]);
+ keep_fds.insert(Pipe[1]);
+ Child = ExecFork(keep_fds);
+ if(Child < 0)
+ return _error->Errno("fork", "Failed to fork");
+ if(Child == 0)
+ {
+ if(Mode == FileFd::ReadOnly)
+ {
+ close(Pipe[0]);
+ fd = Pipe[1];
+ }
+ else if(Mode == FileFd::WriteOnly)
+ {
+ close(Pipe[1]);
+ fd = Pipe[0];
+ }
+
+ if(Mode == FileFd::ReadOnly)
+ {
+ dup2(fd, 1);
+ dup2(fd, 2);
+ } else if(Mode == FileFd::WriteOnly)
+ dup2(fd, 0);
+
+ execv(Args[0], (char**)Args);
+ _exit(100);
+ }
+ if(Mode == FileFd::ReadOnly)
+ {
+ close(Pipe[1]);
+ fd = Pipe[0];
+ } else if(Mode == FileFd::WriteOnly)
+ {
+ close(Pipe[0]);
+ fd = Pipe[1];
+ }
+ Fd.OpenDescriptor(fd, Mode, FileFd::None, true);
+
+ return true;
+}
+
+bool DropPrivs()
+{
+ // uid will be 0 in the end, but gid might be different anyway
+ uid_t old_uid = getuid();
+ gid_t old_gid = getgid();
+
+ if (old_uid != 0)
+ return true;
+ if(_config->FindB("Debug::NoDropPrivs", false) == true)
+ return true;
+
+ const std::string toUser = _config->Find("APT::Sandbox::User", "_apt");
+ struct passwd *pw = getpwnam(toUser.c_str());
+ if (pw == NULL)
+ return _error->Error("No user %s, can not drop rights", toUser.c_str());
+
+#if __gnu_linux__
+ // see prctl(2), needs linux3.5
+ int ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0,0, 0);
+ if(ret < 0)
+ _error->Warning("PR_SET_NO_NEW_PRIVS failed with %i", ret);
+#endif
+ // Do not change the order here, it might break things
+ if (setgroups(1, &pw->pw_gid))
+ return _error->Errno("setgroups", "Failed to setgroups");
+
+ if (setegid(pw->pw_gid) != 0)
+ return _error->Errno("setegid", "Failed to setegid");
+
+ if (setgid(pw->pw_gid) != 0)
+ return _error->Errno("setgid", "Failed to setgid");
+
+ if (setuid(pw->pw_uid) != 0)
+ return _error->Errno("setuid", "Failed to setuid");
+
+ // the seteuid() is probably uneeded (at least thats what the linux
+ // man-page says about setuid(2)) but we cargo culted it anyway
+ if (seteuid(pw->pw_uid) != 0)
+ return _error->Errno("seteuid", "Failed to seteuid");
+
+ // Verify that the user has only a single group, and the correct one
+ gid_t groups[1];
+ if (getgroups(1, groups) != 1)
+ return _error->Errno("getgroups", "Could not get new groups");
+ if (groups[0] != pw->pw_gid)
+ return _error->Error("Could not switch group");
+
+ // Verify that gid, egid, uid, and euid changed
+ if (getgid() != pw->pw_gid)
+ return _error->Error("Could not switch group");
+ if (getegid() != pw->pw_gid)
+ return _error->Error("Could not switch effective group");
+ if (getuid() != pw->pw_uid)
+ return _error->Error("Could not switch user");
+ if (geteuid() != pw->pw_uid)
+ return _error->Error("Could not switch effective user");
+
+#ifdef HAVE_GETRESUID
+ // verify that the saved set-user-id was changed as well
+ uid_t ruid = 0;
+ uid_t euid = 0;
+ uid_t suid = 0;
+ if (getresuid(&ruid, &euid, &suid))
+ return _error->Errno("getresuid", "Could not get saved set-user-ID");
+ if (suid != pw->pw_uid)
+ return _error->Error("Could not switch saved set-user-ID");
+#endif
+
+#ifdef HAVE_GETRESGID
+ // verify that the saved set-group-id was changed as well
+ gid_t rgid = 0;
+ gid_t egid = 0;
+ gid_t sgid = 0;
+ if (getresgid(&rgid, &egid, &sgid))
+ return _error->Errno("getresuid", "Could not get saved set-group-ID");
+ if (sgid != pw->pw_gid)
+ return _error->Error("Could not switch saved set-group-ID");
+#endif
+
+ // Check that uid and gid changes do not work anymore
+ if (pw->pw_gid != old_gid && (setgid(old_gid) != -1 || setegid(old_gid) != -1))
+ return _error->Error("Could restore a gid to root, privilege dropping did not work");
+
+ if (pw->pw_uid != old_uid && (setuid(old_uid) != -1 || seteuid(old_uid) != -1))
+ return _error->Error("Could restore a uid to root, privilege dropping did not work");
+
+ return true;
+}
projects / apt.git / blobdiff