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// Copyright 2020 The gVisor Authors.
//
// 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 <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <vector>
#include "gtest/gtest.h"
#include "test/syscalls/linux/socket_test_util.h"
#include "test/util/file_descriptor.h"
#include "test/util/save_util.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
namespace {
class PingSocket : public ::testing::Test {
protected:
// Creates a socket to be used in tests.
void SetUp() override;
// Closes the socket created by SetUp().
void TearDown() override;
// The loopback address.
struct sockaddr_in addr_;
};
void PingSocket::SetUp() {
// On some hosts ping sockets are restricted to specific groups using the
// sysctl "ping_group_range".
int s = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
if (s < 0 && errno == EPERM) {
GTEST_SKIP();
}
close(s);
addr_ = {};
// Just a random port as the destination port number is irrelevant for ping
// sockets.
addr_.sin_port = 12345;
addr_.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
addr_.sin_family = AF_INET;
}
void PingSocket::TearDown() {}
// Test ICMP port exhaustion returns EAGAIN.
//
// We disable both random/cooperative S/R for this test as it makes way too many
// syscalls.
TEST_F(PingSocket, ICMPPortExhaustion_NoRandomSave) {
DisableSave ds;
std::vector<FileDescriptor> sockets;
constexpr int kSockets = 65536;
addr_.sin_port = 0;
for (int i = 0; i < kSockets; i++) {
auto s =
ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP));
int ret = connect(s.get(), reinterpret_cast<struct sockaddr*>(&addr_),
sizeof(addr_));
if (ret == 0) {
sockets.push_back(std::move(s));
continue;
}
ASSERT_THAT(ret, SyscallFailsWithErrno(EAGAIN));
break;
}
}
} // namespace
} // namespace testing
} // namespace gvisor
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