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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
#include "SandboxOpenedFiles.h"
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <utility>
#include "SandboxLogging.h"
namespace mozilla {
// The default move constructor almost works, but Atomic isn't
// move-constructable and the fd needs some special handling.
SandboxOpenedFile::SandboxOpenedFile(SandboxOpenedFile&& aMoved)
: mPath(std::move(aMoved.mPath)),
mMaybeFd(aMoved.TakeDesc()),
mDup(aMoved.mDup),
mExpectError(aMoved.mExpectError) {}
SandboxOpenedFile::SandboxOpenedFile(const char* aPath, Dup aDup)
: mPath(aPath), mDup(aDup == Dup::YES), mExpectError(false) {
MOZ_ASSERT(aPath[0] == '/', "path should be absolute");
int fd = open(aPath, O_RDONLY | O_CLOEXEC);
if (fd < 0) {
mExpectError = true;
}
mMaybeFd = fd;
}
SandboxOpenedFile::SandboxOpenedFile(const char* aPath, Error)
: mPath(aPath), mMaybeFd(-1), mDup(false), mExpectError(true) {}
int SandboxOpenedFile::GetDesc() const {
int fd;
if (mDup) {
fd = mMaybeFd;
if (fd >= 0) {
fd = dup(fd);
if (fd < 0) {
SANDBOX_LOG_ERRNO("dup");
}
}
} else {
fd = TakeDesc();
}
if (fd < 0 && !mExpectError) {
SANDBOX_LOG("unexpected multiple open of file %s", Path());
}
return fd;
}
SandboxOpenedFile::~SandboxOpenedFile() {
int fd = TakeDesc();
if (fd >= 0) {
close(fd);
}
}
int SandboxOpenedFiles::GetDesc(const char* aPath) const {
for (const auto& file : mFiles) {
if (strcmp(file.Path(), aPath) == 0) {
return file.GetDesc();
}
}
SANDBOX_LOG("attempt to open unexpected file %s", aPath);
return -1;
}
} // namespace mozilla