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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,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_SandboxBrokerCommon_h
#define mozilla_SandboxBrokerCommon_h
#include <sys/types.h>
struct iovec;
// This file defines the protocol between the filesystem broker,
// described in SandboxBroker.h, and its client, described in
// ../SandboxBrokerClient.h; and it defines some utility functions
// used by both.
//
// In order to keep the client simple while allowing it to be thread
// safe and async signal safe, the main broker socket is used only for
// requests; responses arrive on a per-request socketpair sent with
// the request. (This technique is also used by Chromium and Breakpad.)
namespace mozilla {
class SandboxBrokerCommon {
public:
enum Operation {
SANDBOX_FILE_OPEN,
SANDBOX_FILE_ACCESS,
SANDBOX_FILE_STAT,
SANDBOX_FILE_CHMOD,
SANDBOX_FILE_LINK,
SANDBOX_FILE_SYMLINK,
SANDBOX_FILE_MKDIR,
SANDBOX_FILE_RENAME,
SANDBOX_FILE_RMDIR,
SANDBOX_FILE_UNLINK,
SANDBOX_FILE_READLINK,
};
struct Request {
Operation mOp;
// For open, flags; for access, "mode"; for stat, O_NOFOLLOW for lstat.
int mFlags;
// Size of return value buffer, if any
size_t mBufSize;
// The rest of the packet is the pathname.
// SCM_RIGHTS for response socket attached.
};
struct Response {
// Syscall result, -errno if failure, or 0 for no error
int mError;
// Followed by struct stat for stat/lstat.
// SCM_RIGHTS attached for successful open.
};
// This doesn't need to be the system's maximum path length, just
// the largest path that would be allowed by any policy. (It's used
// to size a stack-allocated buffer.)
static const size_t kMaxPathLen = 4096;
static ssize_t RecvWithFd(int aFd, const iovec* aIO, size_t aNumIO,
int* aPassedFdPtr);
static ssize_t SendWithFd(int aFd, const iovec* aIO, size_t aNumIO,
int aPassedFd);
};
} // namespace mozilla
#endif // mozilla_SandboxBrokerCommon_h
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