sandboxed-api/sandboxed_api/sandbox2/network_proxy_client.cc

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// Copyright 2019 Google LLC. All Rights Reserved.
//
// 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 "sandboxed_api/sandbox2/network_proxy_client.h"
#include <cerrno>
#include <iostream>
#include <glog/logging.h>
#include "absl/strings/str_cat.h"
#include "sandboxed_api/sandbox2/util/strerror.h"
#include "sandboxed_api/util/canonical_errors.h"
#include "sandboxed_api/util/status.h"
#include "sandboxed_api/util/status_macros.h"
namespace sandbox2 {
constexpr char NetworkProxyClient::kFDName[];
int NetworkProxyClient::ConnectHandler(int sockfd, const struct sockaddr* addr,
socklen_t addrlen) {
sapi::Status status = Connect(sockfd, addr, addrlen);
if (status.ok()) {
return 0;
}
PLOG(ERROR) << "ConnectHandler() failed: " << status.message();
return -1;
}
sapi::Status NetworkProxyClient::Connect(int sockfd,
const struct sockaddr* addr,
socklen_t addrlen) {
absl::MutexLock lock(&mutex_);
// Check if socket is SOCK_STREAM
int type;
socklen_t type_size = sizeof(int);
int result = getsockopt(sockfd, SOL_SOCKET, SO_TYPE, &type, &type_size);
if (result == -1) {
return sapi::FailedPreconditionError("Invalid socket FD");
}
if (type_size != sizeof(int) || type != SOCK_STREAM) {
errno = EINVAL;
return sapi::InvalidArgumentError(
"Invalid socket, only SOCK_STREAM is allowed");
}
// Send sockaddr struct
if (!comms_.SendBytes(reinterpret_cast<const uint8_t*>(addr), addrlen)) {
errno = EIO;
return sapi::InternalError("Sending data to network proxy failed");
}
SAPI_RETURN_IF_ERROR(ReceiveRemoteResult());
// Receive new socket
int s;
if (!comms_.RecvFD(&s)) {
errno = EIO;
return sapi::InternalError("Receiving data from network proxy failed");
}
if (dup2(s, sockfd) == -1) {
close(s);
return sapi::InternalError("Processing data from network proxy failed");
}
return sapi::OkStatus();
}
sapi::Status NetworkProxyClient::ReceiveRemoteResult() {
int result;
if (!comms_.RecvInt32(&result)) {
errno = EIO;
return sapi::InternalError("Receiving data from the network proxy failed");
}
if (result != 0) {
errno = result;
return sapi::InternalError(
absl::StrCat("Error in network proxy: ", StrError(errno)));
}
return sapi::OkStatus();
}
} // namespace sandbox2