2019-02-27 22:30:20 +00:00
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// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <linux/capability.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/ip_icmp.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include "gtest/gtest.h"
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#include "test/syscalls/linux/socket_test_util.h"
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#include "test/util/capability_util.h"
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#include "test/util/file_descriptor.h"
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#include "test/util/test_util.h"
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namespace gvisor {
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namespace testing {
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namespace {
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// Fixture for tests parameterized by address family (currently only AF_INET).
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class RawSocketTest : public ::testing::Test {
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protected:
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// Creates a socket to be used in tests.
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void SetUp() override;
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// Closes the socket created by SetUp().
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void TearDown() override;
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// The socket used for both reading and writing.
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int s_;
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// The loopback address.
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struct sockaddr_in addr_;
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2019-02-28 20:52:06 +00:00
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void SendEmptyICMP(struct icmphdr *icmp);
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2019-02-27 22:30:20 +00:00
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2019-02-28 20:52:06 +00:00
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void SendEmptyICMPTo(int sock, struct sockaddr_in *addr,
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2019-02-27 22:30:20 +00:00
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struct icmphdr *icmp);
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2019-02-28 20:52:06 +00:00
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void ReceiveICMP(char *recv_buf, size_t recv_buf_len, size_t expected_size,
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2019-02-27 22:30:20 +00:00
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struct sockaddr_in *src);
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2019-02-28 20:52:06 +00:00
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void ReceiveICMPFrom(char *recv_buf, size_t recv_buf_len,
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2019-02-27 22:30:20 +00:00
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size_t expected_size, struct sockaddr_in *src, int sock);
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};
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void RawSocketTest::SetUp() {
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SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
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ASSERT_THAT(s_ = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP), SyscallSucceeds());
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addr_ = {};
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// We don't set ports because raw sockets don't have a notion of ports.
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addr_.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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addr_.sin_family = AF_INET;
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}
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void RawSocketTest::TearDown() {
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SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
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EXPECT_THAT(close(s_), SyscallSucceeds());
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}
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// We should be able to create multiple raw sockets for the same protocol.
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// BasicRawSocket::Setup creates the first one, so we only have to create one
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// more here.
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TEST_F(RawSocketTest, MultipleCreation) {
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SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
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int s2;
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ASSERT_THAT(s2 = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP), SyscallSucceeds());
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ASSERT_THAT(close(s2), SyscallSucceeds());
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}
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// Send and receive an ICMP packet.
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TEST_F(RawSocketTest, SendAndReceive) {
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SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
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// Prepare and send an ICMP packet. Use arbitrary junk for checksum, sequence,
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// and ID. None of that should matter for raw sockets - the kernel should
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// still give us the packet.
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struct icmphdr icmp;
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icmp.type = ICMP_ECHO;
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icmp.code = 0;
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2019-02-28 20:52:06 +00:00
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icmp.checksum = 2011;
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icmp.un.echo.sequence = 2012;
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icmp.un.echo.id = 2014;
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ASSERT_NO_FATAL_FAILURE(SendEmptyICMP(&icmp));
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2019-02-27 22:30:20 +00:00
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2019-02-28 20:52:06 +00:00
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// We're going to receive both the echo request and reply, but the order is
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// indeterminate.
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char recv_buf[512];
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struct sockaddr_in src;
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bool received_request = false;
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bool received_reply = false;
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for (int i = 0; i < 2; i++) {
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// Receive the packet.
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ASSERT_NO_FATAL_FAILURE(ReceiveICMP(recv_buf, ABSL_ARRAYSIZE(recv_buf),
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sizeof(struct icmphdr), &src));
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EXPECT_EQ(memcmp(&src, &addr_, sizeof(sockaddr_in)), 0);
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struct icmphdr *recvd_icmp =
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reinterpret_cast<struct icmphdr *>(recv_buf + sizeof(struct iphdr));
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switch (recvd_icmp->type) {
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case ICMP_ECHO:
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EXPECT_FALSE(received_request);
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received_request = true;
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// The packet should be identical to what we sent.
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EXPECT_EQ(memcmp(recv_buf + sizeof(struct iphdr), &icmp, sizeof(icmp)),
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0);
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break;
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case ICMP_ECHOREPLY:
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EXPECT_FALSE(received_reply);
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received_reply = true;
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// Most fields should be the same.
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EXPECT_EQ(recvd_icmp->code, icmp.code);
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EXPECT_EQ(recvd_icmp->un.echo.sequence, icmp.un.echo.sequence);
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EXPECT_EQ(recvd_icmp->un.echo.id, icmp.un.echo.id);
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// A couple are different.
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EXPECT_EQ(recvd_icmp->type, ICMP_ECHOREPLY);
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// The checksum is computed in such a way that it is guaranteed to have
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// changed.
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EXPECT_NE(recvd_icmp->checksum, icmp.checksum);
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break;
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}
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}
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ASSERT_TRUE(received_request);
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ASSERT_TRUE(received_reply);
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2019-02-27 22:30:20 +00:00
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}
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// We should be able to create multiple raw sockets for the same protocol and
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// receive the same packet on both.
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TEST_F(RawSocketTest, MultipleSocketReceive) {
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SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
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FileDescriptor s2 =
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ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_RAW, IPPROTO_ICMP));
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// Prepare and send an ICMP packet. Use arbitrary junk for checksum, sequence,
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// and ID. None of that should matter for raw sockets - the kernel should
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// still give us the packet.
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struct icmphdr icmp;
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icmp.type = ICMP_ECHO;
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icmp.code = 0;
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2019-02-28 20:52:06 +00:00
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icmp.checksum = 2014;
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icmp.un.echo.sequence = 2016;
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icmp.un.echo.id = 2018;
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ASSERT_NO_FATAL_FAILURE(SendEmptyICMP(&icmp));
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2019-02-27 22:30:20 +00:00
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2019-03-14 17:45:54 +00:00
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// Both sockets will receive the echo request and reply in indeterminate
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// order, so we'll need to read 2 packets from each.
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// Receive on socket 1.
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constexpr int kBufSize = 256;
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std::vector<char[kBufSize]> recv_buf1(2);
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2019-02-27 22:30:20 +00:00
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struct sockaddr_in src;
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2019-03-14 17:45:54 +00:00
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for (int i = 0; i < 2; i++) {
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ASSERT_NO_FATAL_FAILURE(ReceiveICMP(recv_buf1[i],
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ABSL_ARRAYSIZE(recv_buf1[i]),
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sizeof(struct icmphdr), &src));
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EXPECT_EQ(memcmp(&src, &addr_, sizeof(sockaddr_in)), 0);
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}
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// Receive on socket 2.
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std::vector<char[kBufSize]> recv_buf2(2);
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for (int i = 0; i < 2; i++) {
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ASSERT_NO_FATAL_FAILURE(
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ReceiveICMPFrom(recv_buf2[i], ABSL_ARRAYSIZE(recv_buf2[i]),
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sizeof(struct icmphdr), &src, s2.get()));
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EXPECT_EQ(memcmp(&src, &addr_, sizeof(sockaddr_in)), 0);
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}
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// Ensure both sockets receive identical packets.
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int types[] = {ICMP_ECHO, ICMP_ECHOREPLY};
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for (int type : types) {
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auto match_type = [=](char buf[kBufSize]) {
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struct icmphdr *icmp =
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reinterpret_cast<struct icmphdr *>(buf + sizeof(struct iphdr));
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return icmp->type == type;
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};
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char *icmp1 = *std::find_if(recv_buf1.begin(), recv_buf1.end(), match_type);
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char *icmp2 = *std::find_if(recv_buf2.begin(), recv_buf2.end(), match_type);
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ASSERT_NE(icmp1, *recv_buf1.end());
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ASSERT_NE(icmp2, *recv_buf2.end());
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EXPECT_EQ(memcmp(icmp1 + sizeof(struct iphdr), icmp2 + sizeof(struct iphdr),
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sizeof(icmp)),
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0);
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}
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2019-02-27 22:30:20 +00:00
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}
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// A raw ICMP socket and ping socket should both receive the ICMP packets
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// indended for the ping socket.
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TEST_F(RawSocketTest, RawAndPingSockets) {
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SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
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FileDescriptor ping_sock =
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ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP));
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// Ping sockets take care of the ICMP ID and checksum.
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struct icmphdr icmp;
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icmp.type = ICMP_ECHO;
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icmp.code = 0;
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2019-02-28 20:52:06 +00:00
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icmp.un.echo.sequence =
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*static_cast<unsigned short *>(&icmp.un.echo.sequence);
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2019-02-27 22:30:20 +00:00
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ASSERT_THAT(RetryEINTR(sendto)(ping_sock.get(), &icmp, sizeof(icmp), 0,
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(struct sockaddr *)&addr_, sizeof(addr_)),
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SyscallSucceedsWithValue(sizeof(icmp)));
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2019-03-14 17:45:54 +00:00
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// Both sockets will receive the echo request and reply in indeterminate
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// order, so we'll need to read 2 packets from each.
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// Receive on socket 1.
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constexpr int kBufSize = 256;
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std::vector<char[kBufSize]> recv_buf1(2);
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2019-02-27 22:30:20 +00:00
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struct sockaddr_in src;
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2019-03-14 17:45:54 +00:00
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for (int i = 0; i < 2; i++) {
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ASSERT_NO_FATAL_FAILURE(
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ReceiveICMP(recv_buf1[i], kBufSize, sizeof(struct icmphdr), &src));
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EXPECT_EQ(memcmp(&src, &addr_, sizeof(sockaddr_in)), 0);
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}
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// Receive on socket 2.
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std::vector<char[kBufSize]> recv_buf2(2);
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for (int i = 0; i < 2; i++) {
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ASSERT_THAT(RetryEINTR(recv)(ping_sock.get(), recv_buf2[i], kBufSize, 0),
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SyscallSucceedsWithValue(sizeof(struct icmphdr)));
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}
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// Ensure both sockets receive identical packets.
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int types[] = {ICMP_ECHO, ICMP_ECHOREPLY};
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for (int type : types) {
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auto match_type_ping = [=](char buf[kBufSize]) {
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struct icmphdr *icmp = reinterpret_cast<struct icmphdr *>(buf);
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return icmp->type == type;
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};
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auto match_type_raw = [=](char buf[kBufSize]) {
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struct icmphdr *icmp =
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reinterpret_cast<struct icmphdr *>(buf + sizeof(struct iphdr));
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return icmp->type == type;
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};
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char *icmp1 =
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*std::find_if(recv_buf1.begin(), recv_buf1.end(), match_type_raw);
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char *icmp2 =
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*std::find_if(recv_buf2.begin(), recv_buf2.end(), match_type_ping);
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ASSERT_NE(icmp1, *recv_buf1.end());
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ASSERT_NE(icmp2, *recv_buf2.end());
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EXPECT_EQ(memcmp(icmp1 + sizeof(struct iphdr), icmp2, sizeof(icmp)), 0);
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}
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2019-02-27 22:30:20 +00:00
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}
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2019-02-28 20:52:06 +00:00
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void RawSocketTest::SendEmptyICMP(struct icmphdr *icmp) {
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ASSERT_NO_FATAL_FAILURE(SendEmptyICMPTo(s_, &addr_, icmp));
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2019-02-27 22:30:20 +00:00
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}
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2019-02-28 20:52:06 +00:00
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void RawSocketTest::SendEmptyICMPTo(int sock, struct sockaddr_in *addr,
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2019-02-27 22:30:20 +00:00
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struct icmphdr *icmp) {
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struct iovec iov = {.iov_base = icmp, .iov_len = sizeof(*icmp)};
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struct msghdr msg {
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.msg_name = addr, .msg_namelen = sizeof(*addr), .msg_iov = &iov,
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.msg_iovlen = 1, .msg_control = NULL, .msg_controllen = 0, .msg_flags = 0,
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};
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ASSERT_THAT(sendmsg(sock, &msg, 0), SyscallSucceedsWithValue(sizeof(*icmp)));
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}
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2019-02-28 20:52:06 +00:00
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void RawSocketTest::ReceiveICMP(char *recv_buf, size_t recv_buf_len,
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2019-02-27 22:30:20 +00:00
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size_t expected_size, struct sockaddr_in *src) {
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ASSERT_NO_FATAL_FAILURE(
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2019-02-28 20:52:06 +00:00
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ReceiveICMPFrom(recv_buf, recv_buf_len, expected_size, src, s_));
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2019-02-27 22:30:20 +00:00
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}
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2019-02-28 20:52:06 +00:00
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void RawSocketTest::ReceiveICMPFrom(char *recv_buf, size_t recv_buf_len,
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2019-02-27 22:30:20 +00:00
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size_t expected_size,
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struct sockaddr_in *src, int sock) {
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struct iovec iov = {.iov_base = recv_buf, .iov_len = recv_buf_len};
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struct msghdr msg = {
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.msg_name = src,
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.msg_namelen = sizeof(*src),
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.msg_iov = &iov,
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.msg_iovlen = 1,
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.msg_control = NULL,
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.msg_controllen = 0,
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.msg_flags = 0,
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};
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// We should receive the ICMP packet plus 20 bytes of IP header.
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ASSERT_THAT(recvmsg(sock, &msg, 0),
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SyscallSucceedsWithValue(expected_size + sizeof(struct iphdr)));
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}
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} // namespace
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} // namespace testing
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} // namespace gvisor
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