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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 "FwmarkClient.h"
#include "netd_client/FwmarkCommands.h"
#include <sys/socket.h>
#include <unistd.h>
#define CLOSE_FD_AND_RESTORE_ERRNO(fd) \
do { \
int error = errno; \
close(fd); \
errno = error; \
} while (0)
namespace {
typedef int (*ConnectFunctionType)(int, const sockaddr*, socklen_t);
typedef int (*AcceptFunctionType)(int, sockaddr*, socklen_t*);
ConnectFunctionType libcConnect = 0;
AcceptFunctionType libcAccept = 0;
int netdClientConnect(int sockfd, const sockaddr* addr, socklen_t addrlen) {
if (FwmarkClient::shouldSetFwmark(sockfd, addr)) {
char data[] = {FWMARK_COMMAND_ON_CONNECT};
if (!FwmarkClient().send(data, sizeof(data), sockfd)) {
return -1;
}
}
return libcConnect(sockfd, addr, addrlen);
}
int netdClientAccept(int sockfd, sockaddr* addr, socklen_t* addrlen) {
int acceptedSocket = libcAccept(sockfd, addr, addrlen);
if (acceptedSocket == -1) {
return -1;
}
sockaddr socketAddress;
if (!addr) {
socklen_t socketAddressLen = sizeof(socketAddress);
if (getsockname(acceptedSocket, &socketAddress, &socketAddressLen) == -1) {
CLOSE_FD_AND_RESTORE_ERRNO(acceptedSocket);
return -1;
}
addr = &socketAddress;
}
if (FwmarkClient::shouldSetFwmark(acceptedSocket, addr)) {
char data[] = {FWMARK_COMMAND_ON_ACCEPT};
if (!FwmarkClient().send(data, sizeof(data), acceptedSocket)) {
CLOSE_FD_AND_RESTORE_ERRNO(acceptedSocket);
return -1;
}
}
return acceptedSocket;
}
} // namespace
extern "C" void netdClientInitConnect(ConnectFunctionType* function) {
if (function && *function) {
libcConnect = *function;
*function = netdClientConnect;
}
}
extern "C" void netdClientInitAccept(AcceptFunctionType* function) {
if (function && *function) {
libcAccept = *function;
*function = netdClientAccept;
}
}
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