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// 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 <stdint.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
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