emulator/opengl: Remove <cutils/sockets.h>

Remove the dependency on <cutils/sockets.h> by providing
"emugl/common/sockets.h" instead, which contains similar
utility wrappers.

Change-Id: Ifd48abeb208b004c801c9447a4141881f6fa8f44

3 files changed, 279 insertions, 0 deletions

diff --git a/emulator/opengl/shared/emugl/common/Android.mk b/emulator/opengl/shared/emugl/common/Android.mk
index f1c20b5..6a6c169 100644
--- a/emulator/opengl/shared/emugl/common/Android.mk
+++ b/emulator/opengl/shared/emugl/common/Android.mk
@@ -8,6 +8,7 @@ LOCAL_PATH := $(call my-dir)
 commonSources := \
         lazy_instance.cpp \
         smart_ptr.cpp \
+        sockets.cpp \
         thread_store.cpp \
 
 host_commonSources := $(commonSources)
diff --git a/emulator/opengl/shared/emugl/common/sockets.cpp b/emulator/opengl/shared/emugl/common/sockets.cpp
new file mode 100644
index 0000000..feb6d38
--- /dev/null
+++ b/emulator/opengl/shared/emugl/common/sockets.cpp
@@ -0,0 +1,221 @@
+// Copyright (C) 2014 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "emugl/common/sockets.h"
+
+#include <errno.h>
+
+#ifdef _WIN32
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#else
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <sys/un.h>
+#include <sys/stat.h>
+#endif
+
+#include <stddef.h>
+#include <string.h>
+#include <unistd.h>
+
+namespace emugl {
+
+namespace {
+
+static void socketSetReuseAddress(int s) {
+#ifdef _WIN32
+    // The default behaviour on WIndows is equivalent to SO_REUSEADDR
+    // so we don't need to set this option. Moreover, one should never
+    // set this option with WinSock because it's badly implemented and
+    // generates a huge security issue. See:
+    // http://msdn.microsoft.com/en-us/library/windows/desktop/ms740621(v=vs.85).aspx
+#else
+    int val = 1;
+    setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
+#endif
+}
+
+// Helper union to store a socket address.
+struct SockAddr {
+    socklen_t len;
+    union {
+        sockaddr generic;
+        sockaddr_in inet;
+#ifndef _WIN32
+        sockaddr_un local;
+#endif
+    };
+
+    int getFamily() const { return generic.sa_family; }
+
+    void initEmpty() {
+        ::memset(this, 0, sizeof(*this));
+        this->len = static_cast<socklen_t>(sizeof(*this));
+    }
+
+    int initFromInet(uint32_t ip_address, int port) {
+        if (port < 0 || port >= 65536)
+            return -EINVAL;
+
+        ::memset(this, 0, sizeof(*this));
+        this->inet.sin_family = AF_INET;
+        this->inet.sin_port = htons(port);
+        this->inet.sin_addr.s_addr = htonl(ip_address);
+        this->len = sizeof(this->inet);
+        return 0;
+    }
+
+    int initFromLocalhost(int port) {
+        return initFromInet(0x7f000001, port);
+    }
+
+#ifndef _WIN32
+    // Initialize the SockAddr from a Unix path. Returns 0 on success,
+    // or -errno code on failure.
+    int initFromUnixPath(const char* path) {
+        if (!path || !path[0])
+            return -EINVAL;
+
+        size_t pathLen = ::strlen(path);
+        if (pathLen >= sizeof(local.sun_path))
+            return -E2BIG;
+
+        ::memset(this, 0, sizeof(*this));
+        this->local.sun_family = AF_LOCAL;
+        ::memcpy(this->local.sun_path, path, pathLen + 1U);
+        this->len = pathLen + offsetof(sockaddr_un, sun_path);
+        return 0;
+    }
+#endif
+};
+
+int socketBindInternal(const SockAddr* addr, int socketType) {
+    int s = ::socket(addr->getFamily(), socketType, 0);
+    if (s < 0)
+        return -errno;
+
+    // Bind to the socket.
+    if (::bind(s, &addr->generic, addr->len) < 0 ||
+        ::listen(s, 5) < 0) {
+        int ret = -errno;
+        ::close(s);
+        return ret;
+    }
+
+    socketSetReuseAddress(s);
+    return s;
+}
+
+int socketConnectInternal(const SockAddr* addr, int socketType) {
+    int s = ::socket(addr->getFamily(), socketType, 0);
+    if (s < 0)
+        return -errno;
+
+    int ret;
+    do {
+        ret = ::connect(s, &addr->generic, addr->len);
+    } while (ret < 0 && errno == EINTR);
+
+    if (ret < 0) {
+        ret = -errno;
+        ::close(s);
+        return ret;
+    }
+
+    return s;
+}
+
+}  // namespace
+
+void socketTcpDisableNagle(int s) {
+    // disable Nagle algorithm to improve bandwidth of small
+    // packets which are quite common in our implementation.
+#ifdef _WIN32
+    DWORD  flag;
+#else
+    int    flag;
+#endif
+    flag = 1;
+    setsockopt(s, IPPROTO_TCP, TCP_NODELAY,
+               (const char*)&flag, sizeof(flag));
+}
+
+int socketGetPort(int s) {
+    SockAddr addr;
+    addr.initEmpty();
+    if (getsockname(s, &addr.generic, &addr.len) < 0) {
+        return -errno;
+    }
+    switch (addr.generic.sa_family) {
+        case AF_INET:
+            return ntohs(addr.inet.sin_port);
+        default:
+            ;
+    }
+    return -EINVAL;
+}
+
+#ifndef _WIN32
+int socketLocalServer(const char* path, int socketType) {
+    SockAddr addr;
+    int ret = addr.initFromUnixPath(path);
+    if (ret < 0) {
+        return ret;
+    }
+    return socketBindInternal(&addr, socketType);
+}
+
+int socketLocalClient(const char* path, int socketType) {
+    SockAddr addr;
+    int ret = addr.initFromUnixPath(path);
+    if (ret < 0) {
+        return ret;
+    }
+    return socketConnectInternal(&addr, socketType);
+}
+#endif  // !_WIN32
+
+int socketTcpLoopbackServer(int port, int socketType) {
+    SockAddr addr;
+    int ret = addr.initFromLocalhost(port);
+    if (ret < 0) {
+        return ret;
+    }
+    return socketBindInternal(&addr, socketType);
+}
+
+int socketTcpLoopbackClient(int port, int socketType) {
+    SockAddr addr;
+    int ret = addr.initFromLocalhost(port);
+    if (ret < 0) {
+        return ret;
+    }
+    return socketConnectInternal(&addr, socketType);
+}
+
+int socketTcpClient(const char* hostname, int port, int socketType) {
+    // TODO(digit): Implement this.
+    return -ENOSYS;
+}
+
+int socketAccept(int serverSocket) {
+    int ret;
+    do {
+        ret = ::accept(serverSocket, NULL, NULL);
+    } while (ret < 0 && errno == EINTR);
+    return ret;
+}
+
+}  // namespace emugl
diff --git a/emulator/opengl/shared/emugl/common/sockets.h b/emulator/opengl/shared/emugl/common/sockets.h
new file mode 100644
index 0000000..11e7ac7
--- /dev/null
+++ b/emulator/opengl/shared/emugl/common/sockets.h
@@ -0,0 +1,57 @@
+// Copyright (C) 2014 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef EMUGL_COMMON_SOCKETS_H
+#define EMUGL_COMMON_SOCKETS_H
+
+// A set of helper functions used to deal with sockets in a portable way.
+
+namespace emugl {
+
+// Disable Nagle's algorithm for socket descriptor |s|. This assumes
+// that |s| is a TCP socket descriptor.
+void socketTcpDisableNagle(int s);
+
+// Return the port associated with a given IP or IPv6 socket,
+// or -errno code on failure.
+int socketGetPort(int s);
+
+// Bind to a local/Unix path, and return its socket descriptor on success,
+// or -errno code on failure.
+int socketLocalServer(const char* path, int socketType);
+
+// Connect to a Unix local path, and return a new socket descriptor
+// on success, or -errno code on failure.
+int socketLocalClient(const char* path, int socketType);
+
+// Bind to a localhost TCP socket, and return its socket descriptor on
+// success, or -errno code on failure.
+int socketTcpLoopbackServer(int port, int socketType);
+
+// Connect to a localhost TCP port, and return a new socket descriptor on
+// success, or -errno code on failure.
+int socketTcpLoopbackClient(int port, int socketType);
+
+// Connect to a TCP host, and return a new socket descriptor on
+// success, or -errno code on failure.
+int socketTcpClient(const char* hostname, int port, int socketType);
+
+// Accept a new connection. |serverSocket| must be a bound server socket
+// descriptor. Returns new socket descriptor on success, or -errno code
+// on failure.
+int socketAccept(int serverSocket);
+
+}  // namespace emugl
+
+#endif  // EMUGL_COMMON_SOCKETS_H