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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "mojo/edk/embedder/named_platform_handle_utils.h"
#include <errno.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/logging.h"
#include "base/posix/eintr_wrapper.h"
#include "mojo/edk/embedder/named_platform_handle.h"
namespace mojo {
namespace edk {
namespace {
// This function fills in |unix_addr| with the appropriate data for the socket,
// and sets |unix_addr_len| to the length of the data therein.
// Returns true on success, or false on failure (typically because |handle.name|
// violated the naming rules).
bool MakeUnixAddr(const NamedPlatformHandle& handle,
struct sockaddr_un* unix_addr,
size_t* unix_addr_len) {
DCHECK(unix_addr);
DCHECK(unix_addr_len);
DCHECK(handle.is_valid());
// We reject handle.name.length() == kMaxSocketNameLength to make room for the
// NUL terminator at the end of the string.
if (handle.name.length() >= kMaxSocketNameLength) {
LOG(ERROR) << "Socket name too long: " << handle.name;
return false;
}
// Create unix_addr structure.
memset(unix_addr, 0, sizeof(struct sockaddr_un));
unix_addr->sun_family = AF_UNIX;
strncpy(unix_addr->sun_path, handle.name.c_str(), kMaxSocketNameLength);
*unix_addr_len =
offsetof(struct sockaddr_un, sun_path) + handle.name.length();
return true;
}
// This function creates a unix domain socket, and set it as non-blocking.
// If successful, this returns a ScopedPlatformHandle containing the socket.
// Otherwise, this returns an invalid ScopedPlatformHandle.
ScopedPlatformHandle CreateUnixDomainSocket(bool needs_connection) {
// Create the unix domain socket.
PlatformHandle socket_handle(socket(AF_UNIX, SOCK_STREAM, 0));
socket_handle.needs_connection = needs_connection;
ScopedPlatformHandle handle(socket_handle);
if (!handle.is_valid()) {
PLOG(ERROR) << "Failed to create AF_UNIX socket.";
return ScopedPlatformHandle();
}
// Now set it as non-blocking.
if (!base::SetNonBlocking(handle.get().handle)) {
PLOG(ERROR) << "base::SetNonBlocking() failed " << handle.get().handle;
return ScopedPlatformHandle();
}
return handle;
}
} // namespace
ScopedPlatformHandle CreateClientHandle(
const NamedPlatformHandle& named_handle) {
if (!named_handle.is_valid())
return ScopedPlatformHandle();
struct sockaddr_un unix_addr;
size_t unix_addr_len;
if (!MakeUnixAddr(named_handle, &unix_addr, &unix_addr_len))
return ScopedPlatformHandle();
ScopedPlatformHandle handle = CreateUnixDomainSocket(false);
if (!handle.is_valid())
return ScopedPlatformHandle();
if (HANDLE_EINTR(connect(handle.get().handle,
reinterpret_cast<sockaddr*>(&unix_addr),
unix_addr_len)) < 0) {
PLOG(ERROR) << "connect " << named_handle.name;
return ScopedPlatformHandle();
}
return handle;
}
ScopedPlatformHandle CreateServerHandle(
const NamedPlatformHandle& named_handle,
const CreateServerHandleOptions& options) {
if (!named_handle.is_valid())
return ScopedPlatformHandle();
// Make sure the path we need exists.
base::FilePath socket_dir = base::FilePath(named_handle.name).DirName();
if (!base::CreateDirectory(socket_dir)) {
LOG(ERROR) << "Couldn't create directory: " << socket_dir.value();
return ScopedPlatformHandle();
}
// Delete any old FS instances.
if (unlink(named_handle.name.c_str()) < 0 && errno != ENOENT) {
PLOG(ERROR) << "unlink " << named_handle.name;
return ScopedPlatformHandle();
}
struct sockaddr_un unix_addr;
size_t unix_addr_len;
if (!MakeUnixAddr(named_handle, &unix_addr, &unix_addr_len))
return ScopedPlatformHandle();
ScopedPlatformHandle handle = CreateUnixDomainSocket(true);
if (!handle.is_valid())
return ScopedPlatformHandle();
// Bind the socket.
if (bind(handle.get().handle, reinterpret_cast<const sockaddr*>(&unix_addr),
unix_addr_len) < 0) {
PLOG(ERROR) << "bind " << named_handle.name;
return ScopedPlatformHandle();
}
// Start listening on the socket.
if (listen(handle.get().handle, SOMAXCONN) < 0) {
PLOG(ERROR) << "listen " << named_handle.name;
unlink(named_handle.name.c_str());
return ScopedPlatformHandle();
}
return handle;
}
} // namespace edk
} // namespace mojo
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