1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "net/socket/unix_domain_socket_posix.h"
11 #include <sys/socket.h>
13 #include <sys/types.h>
17 #include "base/bind.h"
18 #include "base/callback.h"
19 #include "base/posix/eintr_wrapper.h"
20 #include "base/threading/platform_thread.h"
21 #include "build/build_config.h"
22 #include "net/base/net_errors.h"
23 #include "net/base/net_util.h"
24 #include "net/socket/socket_descriptor.h"
30 bool NoAuthenticationCallback(uid_t, gid_t) {
34 bool GetPeerIds(int socket, uid_t* user_id, gid_t* group_id) {
35 #if defined(OS_LINUX) || defined(OS_ANDROID)
36 struct ucred user_cred;
37 socklen_t len = sizeof(user_cred);
38 if (getsockopt(socket, SOL_SOCKET, SO_PEERCRED, &user_cred, &len) == -1)
40 *user_id = user_cred.uid;
41 *group_id = user_cred.gid;
43 if (getpeereid(socket, user_id, group_id) == -1)
52 UnixDomainSocket::AuthCallback UnixDomainSocket::NoAuthentication() {
53 return base::Bind(NoAuthenticationCallback);
57 scoped_ptr<UnixDomainSocket> UnixDomainSocket::CreateAndListenInternal(
58 const std::string& path,
59 const std::string& fallback_path,
60 StreamListenSocket::Delegate* del,
61 const AuthCallback& auth_callback,
62 bool use_abstract_namespace) {
63 SocketDescriptor s = CreateAndBind(path, use_abstract_namespace);
64 if (s == kInvalidSocket && !fallback_path.empty())
65 s = CreateAndBind(fallback_path, use_abstract_namespace);
66 if (s == kInvalidSocket)
67 return scoped_ptr<UnixDomainSocket>();
68 scoped_ptr<UnixDomainSocket> sock(
69 new UnixDomainSocket(s, del, auth_callback));
75 scoped_ptr<UnixDomainSocket> UnixDomainSocket::CreateAndListen(
76 const std::string& path,
77 StreamListenSocket::Delegate* del,
78 const AuthCallback& auth_callback) {
79 return CreateAndListenInternal(path, "", del, auth_callback, false);
82 #if defined(SOCKET_ABSTRACT_NAMESPACE_SUPPORTED)
84 scoped_ptr<UnixDomainSocket>
85 UnixDomainSocket::CreateAndListenWithAbstractNamespace(
86 const std::string& path,
87 const std::string& fallback_path,
88 StreamListenSocket::Delegate* del,
89 const AuthCallback& auth_callback) {
91 CreateAndListenInternal(path, fallback_path, del, auth_callback, true);
95 UnixDomainSocket::UnixDomainSocket(
97 StreamListenSocket::Delegate* del,
98 const AuthCallback& auth_callback)
99 : StreamListenSocket(s, del),
100 auth_callback_(auth_callback) {}
102 UnixDomainSocket::~UnixDomainSocket() {}
105 SocketDescriptor UnixDomainSocket::CreateAndBind(const std::string& path,
106 bool use_abstract_namespace) {
108 static const size_t kPathMax = sizeof(addr.sun_path);
109 if (use_abstract_namespace + path.size() + 1 /* '\0' */ > kPathMax)
110 return kInvalidSocket;
111 const SocketDescriptor s = CreatePlatformSocket(PF_UNIX, SOCK_STREAM, 0);
112 if (s == kInvalidSocket)
113 return kInvalidSocket;
114 memset(&addr, 0, sizeof(addr));
115 addr.sun_family = AF_UNIX;
117 if (use_abstract_namespace) {
118 // Convert the path given into abstract socket name. It must start with
119 // the '\0' character, so we are adding it. |addr_len| must specify the
120 // length of the structure exactly, as potentially the socket name may
121 // have '\0' characters embedded (although we don't support this).
122 // Note that addr.sun_path is already zero initialized.
123 memcpy(addr.sun_path + 1, path.c_str(), path.size());
124 addr_len = path.size() + offsetof(struct sockaddr_un, sun_path) + 1;
126 memcpy(addr.sun_path, path.c_str(), path.size());
127 addr_len = sizeof(sockaddr_un);
129 if (bind(s, reinterpret_cast<sockaddr*>(&addr), addr_len)) {
130 LOG(ERROR) << "Could not bind unix domain socket to " << path;
131 if (use_abstract_namespace)
132 LOG(ERROR) << " (with abstract namespace enabled)";
133 if (IGNORE_EINTR(close(s)) < 0)
134 LOG(ERROR) << "close() error";
135 return kInvalidSocket;
140 void UnixDomainSocket::Accept() {
141 SocketDescriptor conn = StreamListenSocket::AcceptSocket();
142 if (conn == kInvalidSocket)
146 if (!GetPeerIds(conn, &user_id, &group_id) ||
147 !auth_callback_.Run(user_id, group_id)) {
148 if (IGNORE_EINTR(close(conn)) < 0)
149 LOG(ERROR) << "close() error";
152 scoped_ptr<UnixDomainSocket> sock(
153 new UnixDomainSocket(conn, socket_delegate_, auth_callback_));
154 // It's up to the delegate to AddRef if it wants to keep it around.
155 sock->WatchSocket(WAITING_READ);
156 socket_delegate_->DidAccept(this, sock.PassAs<StreamListenSocket>());
159 UnixDomainSocketFactory::UnixDomainSocketFactory(
160 const std::string& path,
161 const UnixDomainSocket::AuthCallback& auth_callback)
163 auth_callback_(auth_callback) {}
165 UnixDomainSocketFactory::~UnixDomainSocketFactory() {}
167 scoped_ptr<StreamListenSocket> UnixDomainSocketFactory::CreateAndListen(
168 StreamListenSocket::Delegate* delegate) const {
169 return UnixDomainSocket::CreateAndListen(
170 path_, delegate, auth_callback_).PassAs<StreamListenSocket>();
173 #if defined(SOCKET_ABSTRACT_NAMESPACE_SUPPORTED)
175 UnixDomainSocketWithAbstractNamespaceFactory::
176 UnixDomainSocketWithAbstractNamespaceFactory(
177 const std::string& path,
178 const std::string& fallback_path,
179 const UnixDomainSocket::AuthCallback& auth_callback)
180 : UnixDomainSocketFactory(path, auth_callback),
181 fallback_path_(fallback_path) {}
183 UnixDomainSocketWithAbstractNamespaceFactory::
184 ~UnixDomainSocketWithAbstractNamespaceFactory() {}
186 scoped_ptr<StreamListenSocket>
187 UnixDomainSocketWithAbstractNamespaceFactory::CreateAndListen(
188 StreamListenSocket::Delegate* delegate) const {
189 return UnixDomainSocket::CreateAndListenWithAbstractNamespace(
190 path_, fallback_path_, delegate, auth_callback_)
191 .PassAs<StreamListenSocket>();