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// Copyright (c) 2012 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 "net/base/unix_domain_socket_posix.h"
#include <cstring>
#include <string>
#include <errno.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/un.h>
#include <unistd.h>
#include "base/bind.h"
#include "base/callback.h"
#include "base/eintr_wrapper.h"
#include "base/threading/platform_thread.h"
#include "build/build_config.h"
#include "net/base/net_errors.h"
#include "net/base/net_util.h"
namespace net {
namespace {
bool NoAuthenticationCallback(uid_t, gid_t) {
return true;
}
bool GetPeerIds(int socket, uid_t* user_id, gid_t* group_id) {
#if defined(OS_LINUX) || defined(OS_ANDROID)
struct ucred user_cred;
socklen_t len = sizeof(user_cred);
if (getsockopt(socket, SOL_SOCKET, SO_PEERCRED, &user_cred, &len) == -1)
return false;
*user_id = user_cred.uid;
*group_id = user_cred.gid;
#else
if (getpeereid(socket, user_id, group_id) == -1)
return false;
#endif
return true;
}
} // namespace
// static
UnixDomainSocket::AuthCallback NoAuthentication() {
return base::Bind(NoAuthenticationCallback);
}
// static
UnixDomainSocket* UnixDomainSocket::CreateAndListenInternal(
const std::string& path,
StreamListenSocket::Delegate* del,
const AuthCallback& auth_callback,
bool use_abstract_namespace) {
SocketDescriptor s = CreateAndBind(path, use_abstract_namespace);
if (s == kInvalidSocket)
return NULL;
UnixDomainSocket* sock = new UnixDomainSocket(s, del, auth_callback);
sock->Listen();
return sock;
}
// static
scoped_refptr<UnixDomainSocket> UnixDomainSocket::CreateAndListen(
const std::string& path,
StreamListenSocket::Delegate* del,
const AuthCallback& auth_callback) {
return CreateAndListenInternal(path, del, auth_callback, false);
}
#if defined(SOCKET_ABSTRACT_NAMESPACE_SUPPORTED)
// static
scoped_refptr<UnixDomainSocket>
UnixDomainSocket::CreateAndListenWithAbstractNamespace(
const std::string& path,
StreamListenSocket::Delegate* del,
const AuthCallback& auth_callback) {
return make_scoped_refptr(
CreateAndListenInternal(path, del, auth_callback, true));
}
#endif
UnixDomainSocket::UnixDomainSocket(
SocketDescriptor s,
StreamListenSocket::Delegate* del,
const AuthCallback& auth_callback)
: StreamListenSocket(s, del),
auth_callback_(auth_callback) {}
UnixDomainSocket::~UnixDomainSocket() {}
// static
SocketDescriptor UnixDomainSocket::CreateAndBind(const std::string& path,
bool use_abstract_namespace) {
sockaddr_un addr;
static const size_t kPathMax = sizeof(addr.sun_path);
if (use_abstract_namespace + path.size() + 1 /* '\0' */ > kPathMax)
return kInvalidSocket;
const SocketDescriptor s = socket(PF_UNIX, SOCK_STREAM, 0);
if (s == kInvalidSocket)
return kInvalidSocket;
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
socklen_t addr_len;
if (use_abstract_namespace) {
// Convert the path given into abstract socket name. It must start with
// the '\0' character, so we are adding it. |addr_len| must specify the
// length of the structure exactly, as potentially the socket name may
// have '\0' characters embedded (although we don't support this).
// Note that addr.sun_path is already zero initialized.
memcpy(addr.sun_path + 1, path.c_str(), path.size());
addr_len = path.size() + offsetof(struct sockaddr_un, sun_path) + 1;
} else {
memcpy(addr.sun_path, path.c_str(), path.size());
addr_len = sizeof(sockaddr_un);
}
if (bind(s, reinterpret_cast<sockaddr*>(&addr), addr_len)) {
LOG(ERROR) << "Could not bind unix domain socket to " << path;
if (use_abstract_namespace)
LOG(ERROR) << " (with abstract namespace enabled)";
if (HANDLE_EINTR(close(s)) < 0)
LOG(ERROR) << "close() error";
return kInvalidSocket;
}
return s;
}
void UnixDomainSocket::Accept() {
SocketDescriptor conn = StreamListenSocket::AcceptSocket();
if (conn == kInvalidSocket)
return;
uid_t user_id;
gid_t group_id;
if (!GetPeerIds(conn, &user_id, &group_id) ||
!auth_callback_.Run(user_id, group_id)) {
if (HANDLE_EINTR(close(conn)) < 0)
LOG(ERROR) << "close() error";
return;
}
scoped_refptr<UnixDomainSocket> sock(
new UnixDomainSocket(conn, socket_delegate_, auth_callback_));
// It's up to the delegate to AddRef if it wants to keep it around.
sock->WatchSocket(WAITING_READ);
socket_delegate_->DidAccept(this, sock);
}
UnixDomainSocketFactory::UnixDomainSocketFactory(
const std::string& path,
const UnixDomainSocket::AuthCallback& auth_callback)
: path_(path),
auth_callback_(auth_callback) {}
UnixDomainSocketFactory::~UnixDomainSocketFactory() {}
scoped_refptr<StreamListenSocket> UnixDomainSocketFactory::CreateAndListen(
StreamListenSocket::Delegate* delegate) const {
return UnixDomainSocket::CreateAndListen(path_, delegate, auth_callback_);
}
#if defined(SOCKET_ABSTRACT_NAMESPACE_SUPPORTED)
UnixDomainSocketWithAbstractNamespaceFactory::
UnixDomainSocketWithAbstractNamespaceFactory(
const std::string& path,
const UnixDomainSocket::AuthCallback& auth_callback)
: UnixDomainSocketFactory(path, auth_callback) {}
UnixDomainSocketWithAbstractNamespaceFactory::
~UnixDomainSocketWithAbstractNamespaceFactory() {}
scoped_refptr<StreamListenSocket>
UnixDomainSocketWithAbstractNamespaceFactory::CreateAndListen(
StreamListenSocket::Delegate* delegate) const {
return UnixDomainSocket::CreateAndListenWithAbstractNamespace(
path_, delegate, auth_callback_);
}
#endif
} // namespace net
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