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// Copyright 2018 Google LLC
//
// 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 <arpa/inet.h>
#include <netinet/in.h>
#include <sys/sendfile.h>
#include <sys/socket.h>
#include <unistd.h>
#include <vector>
#include "gtest/gtest.h"
#include "absl/strings/string_view.h"
#include "test/syscalls/linux/socket_test_util.h"
#include "test/util/file_descriptor.h"
#include "test/util/temp_path.h"
#include "test/util/test_util.h"
#include "test/util/thread_util.h"
namespace gvisor {
namespace testing {
namespace {
// Sends large file to exercise the path that read and writes data multiple
// times, esp. when more data is read than can be written.
TEST(SendFileTest, SendMultiple) {
std::vector<char> data(5 * 1024 * 1024);
RandomizeBuffer(data.data(), data.size());
// Create temp files.
const TempPath in_file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith(
GetAbsoluteTestTmpdir(), absl::string_view(data.data(), data.size()),
TempPath::kDefaultFileMode));
const TempPath out_file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
// Use a socket for target file to make the write window small.
const FileDescriptor server(socket(AF_INET, SOCK_STREAM, IPPROTO_TCP));
ASSERT_THAT(server.get(), SyscallSucceeds());
struct sockaddr_in server_addr = {};
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = INADDR_ANY;
ASSERT_THAT(
bind(server.get(), reinterpret_cast<struct sockaddr *>(&server_addr),
sizeof(server_addr)),
SyscallSucceeds());
ASSERT_THAT(listen(server.get(), 1), SyscallSucceeds());
// Thread that reads data from socket and dumps to a file.
ScopedThread th([&server, &out_file, &server_addr] {
socklen_t addrlen = sizeof(server_addr);
const FileDescriptor fd(RetryEINTR(accept)(
server.get(), reinterpret_cast<struct sockaddr *>(&server_addr),
&addrlen));
ASSERT_THAT(fd.get(), SyscallSucceeds());
FileDescriptor outf =
ASSERT_NO_ERRNO_AND_VALUE(Open(out_file.path(), O_WRONLY));
// Read until socket is closed.
char buf[10240];
for (int cnt = 0;; cnt++) {
int r = RetryEINTR(read)(fd.get(), buf, sizeof(buf));
// We cannot afford to save on every read() call.
if (cnt % 1000 == 0) {
ASSERT_THAT(r, SyscallSucceeds());
} else {
const DisableSave ds;
ASSERT_THAT(r, SyscallSucceeds());
}
if (r == 0) {
// EOF
break;
}
int w = RetryEINTR(write)(outf.get(), buf, r);
// We cannot afford to save on every write() call.
if (cnt % 1010 == 0) {
ASSERT_THAT(w, SyscallSucceedsWithValue(r));
} else {
const DisableSave ds;
ASSERT_THAT(w, SyscallSucceedsWithValue(r));
}
}
});
// Open the input file as read only.
const FileDescriptor inf =
ASSERT_NO_ERRNO_AND_VALUE(Open(in_file.path(), O_RDONLY));
FileDescriptor outf(socket(AF_INET, SOCK_STREAM, IPPROTO_TCP));
ASSERT_THAT(outf.get(), SyscallSucceeds());
// Get the port bound by the listening socket.
socklen_t addrlen = sizeof(server_addr);
ASSERT_THAT(getsockname(server.get(),
reinterpret_cast<sockaddr *>(&server_addr), &addrlen),
SyscallSucceeds());
struct sockaddr_in addr = {};
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr("127.0.0.1");
addr.sin_port = server_addr.sin_port;
LOG(INFO) << "Connecting on port=" << server_addr.sin_port;
ASSERT_THAT(
RetryEINTR(connect)(
outf.get(), reinterpret_cast<struct sockaddr *>(&addr), sizeof(addr)),
SyscallSucceeds());
int cnt = 0;
for (size_t sent = 0; sent < data.size(); cnt++) {
const size_t remain = data.size() - sent;
LOG(INFO) << "sendfile, size=" << data.size() << ", sent=" << sent
<< ", remain=" << remain;
// Send data and verify that sendfile returns the correct value.
int res = sendfile(outf.get(), inf.get(), nullptr, remain);
// We cannot afford to save on every sendfile() call.
if (cnt % 120 == 0) {
MaybeSave();
}
if (res == 0) {
// EOF
break;
}
if (res > 0) {
sent += res;
} else {
ASSERT_TRUE(errno == EINTR || errno == EAGAIN) << "errno=" << errno;
}
}
// Close socket to stop thread.
outf.reset();
th.Join();
// Verify that the output file has the correct data.
outf = ASSERT_NO_ERRNO_AND_VALUE(Open(out_file.path(), O_RDONLY));
std::vector<char> actual(data.size(), '\0');
ASSERT_THAT(RetryEINTR(read)(outf.get(), actual.data(), actual.size()),
SyscallSucceedsWithValue(actual.size()));
ASSERT_EQ(memcmp(data.data(), actual.data(), data.size()), 0);
}
} // namespace
} // namespace testing
} // namespace gvisor
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