// Copyright 2019 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 "test/syscalls/linux/socket_ipv4_udp_unbound.h" #include #include #include #include #include #include "gtest/gtest.h" #include "absl/memory/memory.h" #include "test/syscalls/linux/ip_socket_test_util.h" #include "test/syscalls/linux/socket_test_util.h" #include "test/util/test_util.h" namespace gvisor { namespace testing { // Check that packets are not received without a group membership. Default send // interface configured by bind. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastLoopbackNoGroup) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind the first FD to the loopback. This is an alternative to // IP_MULTICAST_IF for setting the default send interface. auto sender_addr = V4Loopback(); EXPECT_THAT( bind(socket1->get(), reinterpret_cast(&sender_addr.addr), sender_addr.addr_len), SyscallSucceeds()); // Bind the second FD to the v4 any address. If multicast worked like unicast, // this would ensure that we get the packet. auto receiver_addr = V4Any(); EXPECT_THAT( bind(socket2->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket2->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Send the multicast packet. auto send_addr = V4Multicast(); reinterpret_cast(&send_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); EXPECT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&send_addr.addr), send_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we did not receive the multicast packet. char recv_buf[sizeof(send_buf)] = {}; EXPECT_THAT(RetryEINTR(recv)(socket2->get(), recv_buf, sizeof(recv_buf), MSG_DONTWAIT), SyscallFailsWithErrno(EAGAIN)); } // Check that not setting a default send interface prevents multicast packets // from being sent. Group membership interface configured by address. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastLoopbackAddrNoDefaultSendIf) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind the second FD to the v4 any address to ensure that we can receive any // unicast packet. auto receiver_addr = V4Any(); EXPECT_THAT( bind(socket2->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket2->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register to receive multicast packets. ip_mreq group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_interface.s_addr = htonl(INADDR_LOOPBACK); EXPECT_THAT(setsockopt(socket2->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet. auto send_addr = V4Multicast(); reinterpret_cast(&send_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); EXPECT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&send_addr.addr), send_addr.addr_len), SyscallFailsWithErrno(ENETUNREACH)); } // Check that not setting a default send interface prevents multicast packets // from being sent. Group membership interface configured by NIC ID. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastLoopbackNicNoDefaultSendIf) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind the second FD to the v4 any address to ensure that we can receive any // unicast packet. auto receiver_addr = V4Any(); ASSERT_THAT( bind(socket2->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket2->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register to receive multicast packets. ip_mreqn group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); EXPECT_THAT(setsockopt(socket2->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet. auto send_addr = V4Multicast(); reinterpret_cast(&send_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); EXPECT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&send_addr.addr), send_addr.addr_len), SyscallFailsWithErrno(ENETUNREACH)); } // Check that multicast works when the default send interface is configured by // bind and the group membership is configured by address. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastLoopbackAddr) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind the first FD to the loopback. This is an alternative to // IP_MULTICAST_IF for setting the default send interface. auto sender_addr = V4Loopback(); ASSERT_THAT( bind(socket1->get(), reinterpret_cast(&sender_addr.addr), sender_addr.addr_len), SyscallSucceeds()); // Bind the second FD to the v4 any address to ensure that we can receive the // multicast packet. auto receiver_addr = V4Any(); ASSERT_THAT( bind(socket2->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket2->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register to receive multicast packets. ip_mreq group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_interface.s_addr = htonl(INADDR_LOOPBACK); ASSERT_THAT(setsockopt(socket2->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet. auto send_addr = V4Multicast(); reinterpret_cast(&send_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&send_addr.addr), send_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we received the multicast packet. char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT(RetryEINTR(recv)(socket2->get(), recv_buf, sizeof(recv_buf), 0), SyscallSucceedsWithValue(sizeof(recv_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } // Check that multicast works when the default send interface is configured by // bind and the group membership is configured by NIC ID. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastLoopbackNic) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind the first FD to the loopback. This is an alternative to // IP_MULTICAST_IF for setting the default send interface. auto sender_addr = V4Loopback(); ASSERT_THAT( bind(socket1->get(), reinterpret_cast(&sender_addr.addr), sender_addr.addr_len), SyscallSucceeds()); // Bind the second FD to the v4 any address to ensure that we can receive the // multicast packet. auto receiver_addr = V4Any(); ASSERT_THAT( bind(socket2->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket2->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register to receive multicast packets. ip_mreqn group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); ASSERT_THAT(setsockopt(socket2->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet. auto send_addr = V4Multicast(); reinterpret_cast(&send_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&send_addr.addr), send_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we received the multicast packet. char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT(RetryEINTR(recv)(socket2->get(), recv_buf, sizeof(recv_buf), 0), SyscallSucceedsWithValue(sizeof(recv_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } // Check that multicast works when the default send interface is configured by // IP_MULTICAST_IF, the send address is specified in sendto, and the group // membership is configured by address. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastLoopbackIfAddr) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Set the default send interface. ip_mreq iface = {}; iface.imr_interface.s_addr = htonl(INADDR_LOOPBACK); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallSucceeds()); // Bind the second FD to the v4 any address to ensure that we can receive the // multicast packet. auto receiver_addr = V4Any(); ASSERT_THAT( bind(socket2->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket2->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register to receive multicast packets. ip_mreq group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_interface.s_addr = htonl(INADDR_LOOPBACK); ASSERT_THAT(setsockopt(socket2->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet. auto send_addr = V4Multicast(); reinterpret_cast(&send_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&send_addr.addr), send_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we received the multicast packet. char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT(RetryEINTR(recv)(socket2->get(), recv_buf, sizeof(recv_buf), 0), SyscallSucceedsWithValue(sizeof(recv_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } // Check that multicast works when the default send interface is configured by // IP_MULTICAST_IF, the send address is specified in sendto, and the group // membership is configured by NIC ID. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastLoopbackIfNic) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Set the default send interface. ip_mreqn iface = {}; iface.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallSucceeds()); // Bind the second FD to the v4 any address to ensure that we can receive the // multicast packet. auto receiver_addr = V4Any(); ASSERT_THAT( bind(socket2->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket2->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register to receive multicast packets. ip_mreqn group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); ASSERT_THAT(setsockopt(socket2->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet. auto send_addr = V4Multicast(); reinterpret_cast(&send_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&send_addr.addr), send_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we received the multicast packet. char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT(RetryEINTR(recv)(socket2->get(), recv_buf, sizeof(recv_buf), 0), SyscallSucceedsWithValue(sizeof(recv_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } // Check that multicast works when the default send interface is configured by // IP_MULTICAST_IF, the send address is specified in connect, and the group // membership is configured by address. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastLoopbackIfAddrConnect) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Set the default send interface. ip_mreq iface = {}; iface.imr_interface.s_addr = htonl(INADDR_LOOPBACK); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallSucceeds()); // Bind the second FD to the v4 any address to ensure that we can receive the // multicast packet. auto receiver_addr = V4Any(); ASSERT_THAT( bind(socket2->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket2->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register to receive multicast packets. ip_mreq group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_interface.s_addr = htonl(INADDR_LOOPBACK); ASSERT_THAT(setsockopt(socket2->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet. auto connect_addr = V4Multicast(); reinterpret_cast(&connect_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; ASSERT_THAT( RetryEINTR(connect)(socket1->get(), reinterpret_cast(&connect_addr.addr), connect_addr.addr_len), SyscallSucceeds()); char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(send)(socket1->get(), send_buf, sizeof(send_buf), 0), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we received the multicast packet. char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT(RetryEINTR(recv)(socket2->get(), recv_buf, sizeof(recv_buf), 0), SyscallSucceedsWithValue(sizeof(recv_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } // Check that multicast works when the default send interface is configured by // IP_MULTICAST_IF, the send address is specified in connect, and the group // membership is configured by NIC ID. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastLoopbackIfNicConnect) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Set the default send interface. ip_mreqn iface = {}; iface.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallSucceeds()); // Bind the second FD to the v4 any address to ensure that we can receive the // multicast packet. auto receiver_addr = V4Any(); ASSERT_THAT( bind(socket2->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket2->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register to receive multicast packets. ip_mreqn group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); ASSERT_THAT(setsockopt(socket2->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet. auto connect_addr = V4Multicast(); reinterpret_cast(&connect_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; ASSERT_THAT( RetryEINTR(connect)(socket1->get(), reinterpret_cast(&connect_addr.addr), connect_addr.addr_len), SyscallSucceeds()); char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(send)(socket1->get(), send_buf, sizeof(send_buf), 0), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we received the multicast packet. char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT(RetryEINTR(recv)(socket2->get(), recv_buf, sizeof(recv_buf), 0), SyscallSucceedsWithValue(sizeof(recv_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } // Check that multicast works when the default send interface is configured by // IP_MULTICAST_IF, the send address is specified in sendto, and the group // membership is configured by address. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastLoopbackIfAddrSelf) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Set the default send interface. ip_mreq iface = {}; iface.imr_interface.s_addr = htonl(INADDR_LOOPBACK); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallSucceeds()); // Bind the first FD to the v4 any address to ensure that we can receive the // multicast packet. auto receiver_addr = V4Any(); ASSERT_THAT( bind(socket1->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket1->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register to receive multicast packets. ip_mreq group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_interface.s_addr = htonl(INADDR_LOOPBACK); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet. auto send_addr = V4Multicast(); reinterpret_cast(&send_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&send_addr.addr), send_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we received the multicast packet. char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT(RetryEINTR(recv)(socket1->get(), recv_buf, sizeof(recv_buf), 0), SyscallSucceedsWithValue(sizeof(recv_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } // Check that multicast works when the default send interface is configured by // IP_MULTICAST_IF, the send address is specified in sendto, and the group // membership is configured by NIC ID. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastLoopbackIfNicSelf) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Set the default send interface. ip_mreqn iface = {}; iface.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallSucceeds()); // Bind the first FD to the v4 any address to ensure that we can receive the // multicast packet. auto receiver_addr = V4Any(); ASSERT_THAT( bind(socket1->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket1->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register to receive multicast packets. ip_mreqn group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet. auto send_addr = V4Multicast(); reinterpret_cast(&send_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&send_addr.addr), send_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we received the multicast packet. char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT(RetryEINTR(recv)(socket1->get(), recv_buf, sizeof(recv_buf), 0), SyscallSucceedsWithValue(sizeof(recv_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } // Check that multicast works when the default send interface is configured by // IP_MULTICAST_IF, the send address is specified in connect, and the group // membership is configured by address. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastLoopbackIfAddrSelfConnect) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Set the default send interface. ip_mreq iface = {}; iface.imr_interface.s_addr = htonl(INADDR_LOOPBACK); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallSucceeds()); // Bind the first FD to the v4 any address to ensure that we can receive the // multicast packet. auto receiver_addr = V4Any(); ASSERT_THAT( bind(socket1->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket1->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register to receive multicast packets. ip_mreq group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_interface.s_addr = htonl(INADDR_LOOPBACK); EXPECT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet. auto connect_addr = V4Multicast(); reinterpret_cast(&connect_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; EXPECT_THAT( RetryEINTR(connect)(socket1->get(), reinterpret_cast(&connect_addr.addr), connect_addr.addr_len), SyscallSucceeds()); char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(send)(socket1->get(), send_buf, sizeof(send_buf), 0), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we did not receive the multicast packet. char recv_buf[sizeof(send_buf)] = {}; EXPECT_THAT(RetryEINTR(recv)(socket1->get(), recv_buf, sizeof(recv_buf), MSG_DONTWAIT), SyscallFailsWithErrno(EAGAIN)); } // Check that multicast works when the default send interface is configured by // IP_MULTICAST_IF, the send address is specified in connect, and the group // membership is configured by NIC ID. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastLoopbackIfNicSelfConnect) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Set the default send interface. ip_mreqn iface = {}; iface.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallSucceeds()); // Bind the first FD to the v4 any address to ensure that we can receive the // multicast packet. auto receiver_addr = V4Any(); ASSERT_THAT( bind(socket1->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket1->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register to receive multicast packets. ip_mreqn group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet. auto connect_addr = V4Multicast(); reinterpret_cast(&connect_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; ASSERT_THAT( RetryEINTR(connect)(socket1->get(), reinterpret_cast(&connect_addr.addr), connect_addr.addr_len), SyscallSucceeds()); char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(send)(socket1->get(), send_buf, sizeof(send_buf), 0), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we did not receive the multicast packet. char recv_buf[sizeof(send_buf)] = {}; EXPECT_THAT(RetryEINTR(recv)(socket1->get(), recv_buf, sizeof(recv_buf), MSG_DONTWAIT), SyscallFailsWithErrno(EAGAIN)); } // Check that multicast works when the default send interface is configured by // IP_MULTICAST_IF, the send address is specified in sendto, and the group // membership is configured by address. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastLoopbackIfAddrSelfNoLoop) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Set the default send interface. ip_mreq iface = {}; iface.imr_interface.s_addr = htonl(INADDR_LOOPBACK); EXPECT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallSucceeds()); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_LOOP, &kSockOptOff, sizeof(kSockOptOff)), SyscallSucceeds()); // Bind the first FD to the v4 any address to ensure that we can receive the // multicast packet. auto receiver_addr = V4Any(); ASSERT_THAT( bind(socket1->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket1->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register to receive multicast packets. ip_mreq group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_interface.s_addr = htonl(INADDR_LOOPBACK); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet. auto send_addr = V4Multicast(); reinterpret_cast(&send_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&send_addr.addr), send_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we received the multicast packet. char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT(RetryEINTR(recv)(socket1->get(), recv_buf, sizeof(recv_buf), 0), SyscallSucceedsWithValue(sizeof(recv_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } // Check that multicast works when the default send interface is configured by // IP_MULTICAST_IF, the send address is specified in sendto, and the group // membership is configured by NIC ID. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastLoopbackIfNicSelfNoLoop) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Set the default send interface. ip_mreqn iface = {}; iface.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallSucceeds()); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_LOOP, &kSockOptOff, sizeof(kSockOptOff)), SyscallSucceeds()); // Bind the second FD to the v4 any address to ensure that we can receive the // multicast packet. auto receiver_addr = V4Any(); ASSERT_THAT( bind(socket1->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket1->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register to receive multicast packets. ip_mreqn group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); EXPECT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet. auto send_addr = V4Multicast(); reinterpret_cast(&send_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&send_addr.addr), send_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we received the multicast packet. char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT(RetryEINTR(recv)(socket1->get(), recv_buf, sizeof(recv_buf), 0), SyscallSucceedsWithValue(sizeof(recv_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } // Check that dropping a group membership that does not exist fails. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastInvalidDrop) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Unregister from a membership that we didn't have. ip_mreq group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_interface.s_addr = htonl(INADDR_LOOPBACK); EXPECT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_DROP_MEMBERSHIP, &group, sizeof(group)), SyscallFailsWithErrno(EADDRNOTAVAIL)); } // Check that dropping a group membership prevents multicast packets from being // delivered. Default send address configured by bind and group membership // interface configured by address. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastDropAddr) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind the first FD to the loopback. This is an alternative to // IP_MULTICAST_IF for setting the default send interface. auto sender_addr = V4Loopback(); EXPECT_THAT( bind(socket1->get(), reinterpret_cast(&sender_addr.addr), sender_addr.addr_len), SyscallSucceeds()); // Bind the second FD to the v4 any address to ensure that we can receive the // multicast packet. auto receiver_addr = V4Any(); EXPECT_THAT( bind(socket2->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket2->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register and unregister to receive multicast packets. ip_mreq group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_interface.s_addr = htonl(INADDR_LOOPBACK); EXPECT_THAT(setsockopt(socket2->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); EXPECT_THAT(setsockopt(socket2->get(), IPPROTO_IP, IP_DROP_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet. auto send_addr = V4Multicast(); reinterpret_cast(&send_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); EXPECT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&send_addr.addr), send_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we did not receive the multicast packet. char recv_buf[sizeof(send_buf)] = {}; EXPECT_THAT(RetryEINTR(recv)(socket2->get(), recv_buf, sizeof(recv_buf), MSG_DONTWAIT), SyscallFailsWithErrno(EAGAIN)); } // Check that dropping a group membership prevents multicast packets from being // delivered. Default send address configured by bind and group membership // interface configured by NIC ID. TEST_P(IPv4UDPUnboundSocketTest, IpMulticastDropNic) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind the first FD to the loopback. This is an alternative to // IP_MULTICAST_IF for setting the default send interface. auto sender_addr = V4Loopback(); EXPECT_THAT( bind(socket1->get(), reinterpret_cast(&sender_addr.addr), sender_addr.addr_len), SyscallSucceeds()); // Bind the second FD to the v4 any address to ensure that we can receive the // multicast packet. auto receiver_addr = V4Any(); EXPECT_THAT( bind(socket2->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket2->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register and unregister to receive multicast packets. ip_mreqn group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); EXPECT_THAT(setsockopt(socket2->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); EXPECT_THAT(setsockopt(socket2->get(), IPPROTO_IP, IP_DROP_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet. auto send_addr = V4Multicast(); reinterpret_cast(&send_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); EXPECT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&send_addr.addr), send_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we did not receive the multicast packet. char recv_buf[sizeof(send_buf)] = {}; EXPECT_THAT(RetryEINTR(recv)(socket2->get(), recv_buf, sizeof(recv_buf), MSG_DONTWAIT), SyscallFailsWithErrno(EAGAIN)); } TEST_P(IPv4UDPUnboundSocketTest, IpMulticastIfZero) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); ip_mreqn iface = {}; EXPECT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallSucceeds()); } TEST_P(IPv4UDPUnboundSocketTest, IpMulticastIfInvalidNic) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); ip_mreqn iface = {}; iface.imr_ifindex = -1; EXPECT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallFailsWithErrno(EADDRNOTAVAIL)); } TEST_P(IPv4UDPUnboundSocketTest, IpMulticastIfInvalidAddr) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); ip_mreq iface = {}; iface.imr_interface.s_addr = inet_addr("255.255.255"); EXPECT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallFailsWithErrno(EADDRNOTAVAIL)); } TEST_P(IPv4UDPUnboundSocketTest, IpMulticastIfSetShort) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Create a valid full-sized request. ip_mreqn iface = {}; iface.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); // Send an optlen of 1 to check that optlen is enforced. EXPECT_THAT( setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &iface, 1), SyscallFailsWithErrno(EINVAL)); } TEST_P(IPv4UDPUnboundSocketTest, IpMulticastIfDefault) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); in_addr get = {}; socklen_t size = sizeof(get); ASSERT_THAT( getsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &get, &size), SyscallSucceeds()); EXPECT_EQ(size, sizeof(get)); EXPECT_EQ(get.s_addr, 0); } TEST_P(IPv4UDPUnboundSocketTest, IpMulticastIfDefaultReqn) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); ip_mreqn get = {}; socklen_t size = sizeof(get); ASSERT_THAT( getsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &get, &size), SyscallSucceeds()); // getsockopt(IP_MULTICAST_IF) can only return an in_addr, so it treats the // first sizeof(struct in_addr) bytes of struct ip_mreqn as a struct in_addr. // Conveniently, this corresponds to the field ip_mreqn::imr_multiaddr. EXPECT_EQ(size, sizeof(in_addr)); // getsockopt(IP_MULTICAST_IF) will only return the interface address which // hasn't been set. EXPECT_EQ(get.imr_multiaddr.s_addr, 0); EXPECT_EQ(get.imr_address.s_addr, 0); EXPECT_EQ(get.imr_ifindex, 0); } TEST_P(IPv4UDPUnboundSocketTest, IpMulticastIfSetAddrGetReqn) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); in_addr set = {}; set.s_addr = htonl(INADDR_LOOPBACK); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &set, sizeof(set)), SyscallSucceeds()); ip_mreqn get = {}; socklen_t size = sizeof(get); ASSERT_THAT( getsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &get, &size), SyscallSucceeds()); // getsockopt(IP_MULTICAST_IF) can only return an in_addr, so it treats the // first sizeof(struct in_addr) bytes of struct ip_mreqn as a struct in_addr. // Conveniently, this corresponds to the field ip_mreqn::imr_multiaddr. EXPECT_EQ(size, sizeof(in_addr)); EXPECT_EQ(get.imr_multiaddr.s_addr, set.s_addr); EXPECT_EQ(get.imr_address.s_addr, 0); EXPECT_EQ(get.imr_ifindex, 0); } TEST_P(IPv4UDPUnboundSocketTest, IpMulticastIfSetReqAddrGetReqn) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); ip_mreq set = {}; set.imr_interface.s_addr = htonl(INADDR_LOOPBACK); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &set, sizeof(set)), SyscallSucceeds()); ip_mreqn get = {}; socklen_t size = sizeof(get); ASSERT_THAT( getsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &get, &size), SyscallSucceeds()); // getsockopt(IP_MULTICAST_IF) can only return an in_addr, so it treats the // first sizeof(struct in_addr) bytes of struct ip_mreqn as a struct in_addr. // Conveniently, this corresponds to the field ip_mreqn::imr_multiaddr. EXPECT_EQ(size, sizeof(in_addr)); EXPECT_EQ(get.imr_multiaddr.s_addr, set.imr_interface.s_addr); EXPECT_EQ(get.imr_address.s_addr, 0); EXPECT_EQ(get.imr_ifindex, 0); } TEST_P(IPv4UDPUnboundSocketTest, IpMulticastIfSetNicGetReqn) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); ip_mreqn set = {}; set.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &set, sizeof(set)), SyscallSucceeds()); ip_mreqn get = {}; socklen_t size = sizeof(get); ASSERT_THAT( getsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &get, &size), SyscallSucceeds()); EXPECT_EQ(size, sizeof(in_addr)); EXPECT_EQ(get.imr_multiaddr.s_addr, 0); EXPECT_EQ(get.imr_address.s_addr, 0); EXPECT_EQ(get.imr_ifindex, 0); } TEST_P(IPv4UDPUnboundSocketTest, IpMulticastIfSetAddr) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); in_addr set = {}; set.s_addr = htonl(INADDR_LOOPBACK); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &set, sizeof(set)), SyscallSucceeds()); in_addr get = {}; socklen_t size = sizeof(get); ASSERT_THAT( getsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &get, &size), SyscallSucceeds()); EXPECT_EQ(size, sizeof(get)); EXPECT_EQ(get.s_addr, set.s_addr); } TEST_P(IPv4UDPUnboundSocketTest, IpMulticastIfSetReqAddr) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); ip_mreq set = {}; set.imr_interface.s_addr = htonl(INADDR_LOOPBACK); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &set, sizeof(set)), SyscallSucceeds()); in_addr get = {}; socklen_t size = sizeof(get); ASSERT_THAT( getsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &get, &size), SyscallSucceeds()); EXPECT_EQ(size, sizeof(get)); EXPECT_EQ(get.s_addr, set.imr_interface.s_addr); } TEST_P(IPv4UDPUnboundSocketTest, IpMulticastIfSetNic) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); ip_mreqn set = {}; set.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &set, sizeof(set)), SyscallSucceeds()); in_addr get = {}; socklen_t size = sizeof(get); ASSERT_THAT( getsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &get, &size), SyscallSucceeds()); EXPECT_EQ(size, sizeof(get)); EXPECT_EQ(get.s_addr, 0); } TEST_P(IPv4UDPUnboundSocketTest, TestJoinGroupNoIf) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); ip_mreqn group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); EXPECT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallFailsWithErrno(ENODEV)); } TEST_P(IPv4UDPUnboundSocketTest, TestJoinGroupInvalidIf) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); ip_mreqn group = {}; group.imr_address.s_addr = inet_addr("255.255.255"); group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); EXPECT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallFailsWithErrno(ENODEV)); } // Check that multiple memberships are not allowed on the same socket. TEST_P(IPv4UDPUnboundSocketTest, TestMultipleJoinsOnSingleSocket) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto fd = socket1->get(); ip_mreqn group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); EXPECT_THAT( setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); EXPECT_THAT( setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallFailsWithErrno(EADDRINUSE)); } // Check that two sockets can join the same multicast group at the same time. TEST_P(IPv4UDPUnboundSocketTest, TestTwoSocketsJoinSameMulticastGroup) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); ip_mreqn group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); EXPECT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); EXPECT_THAT(setsockopt(socket2->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Drop the membership twice on each socket, the second call for each socket // should fail. EXPECT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_DROP_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); EXPECT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_DROP_MEMBERSHIP, &group, sizeof(group)), SyscallFailsWithErrno(EADDRNOTAVAIL)); EXPECT_THAT(setsockopt(socket2->get(), IPPROTO_IP, IP_DROP_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); EXPECT_THAT(setsockopt(socket2->get(), IPPROTO_IP, IP_DROP_MEMBERSHIP, &group, sizeof(group)), SyscallFailsWithErrno(EADDRNOTAVAIL)); } // Check that two sockets can join the same multicast group at the same time, // and both will receive data on it. TEST_P(IPv4UDPUnboundSocketTest, TestMcastReceptionOnTwoSockets) { std::unique_ptr socket_pairs[2] = { absl::make_unique(ASSERT_NO_ERRNO_AND_VALUE(NewSocket()), ASSERT_NO_ERRNO_AND_VALUE(NewSocket())), absl::make_unique(ASSERT_NO_ERRNO_AND_VALUE(NewSocket()), ASSERT_NO_ERRNO_AND_VALUE(NewSocket()))}; ip_mreq iface = {}, group = {}; iface.imr_interface.s_addr = htonl(INADDR_LOOPBACK); group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_interface.s_addr = htonl(INADDR_LOOPBACK); auto receiver_addr = V4Any(); int bound_port = 0; // Create two socketpairs with the exact same configuration. for (auto& sockets : socket_pairs) { ASSERT_THAT(setsockopt(sockets->first_fd(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallSucceeds()); ASSERT_THAT(setsockopt(sockets->second_fd(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(setsockopt(sockets->second_fd(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); ASSERT_THAT(bind(sockets->second_fd(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); // Get the port assigned. socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(sockets->second_fd(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // On the first iteration, save the port we are bound to. On the second // iteration, verify the port is the same as the one from the first // iteration. In other words, both sockets listen on the same port. if (bound_port == 0) { bound_port = reinterpret_cast(&receiver_addr.addr)->sin_port; } else { EXPECT_EQ(bound_port, reinterpret_cast(&receiver_addr.addr)->sin_port); } } // Send a multicast packet to the group from two different sockets and verify // it is received by both sockets that joined that group. auto send_addr = V4Multicast(); reinterpret_cast(&send_addr.addr)->sin_port = bound_port; for (auto& sockets : socket_pairs) { char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT( RetryEINTR(sendto)(sockets->first_fd(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&send_addr.addr), send_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we received the multicast packet on both sockets. for (auto& sockets : socket_pairs) { char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT( RetryEINTR(recv)(sockets->second_fd(), recv_buf, sizeof(recv_buf), 0), SyscallSucceedsWithValue(sizeof(recv_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } } } // Check that on two sockets that joined a group and listen on ANY, dropping // memberships one by one will continue to deliver packets to both sockets until // both memberships have been dropped. TEST_P(IPv4UDPUnboundSocketTest, TestMcastReceptionWhenDroppingMemberships) { std::unique_ptr socket_pairs[2] = { absl::make_unique(ASSERT_NO_ERRNO_AND_VALUE(NewSocket()), ASSERT_NO_ERRNO_AND_VALUE(NewSocket())), absl::make_unique(ASSERT_NO_ERRNO_AND_VALUE(NewSocket()), ASSERT_NO_ERRNO_AND_VALUE(NewSocket()))}; ip_mreq iface = {}, group = {}; iface.imr_interface.s_addr = htonl(INADDR_LOOPBACK); group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_interface.s_addr = htonl(INADDR_LOOPBACK); auto receiver_addr = V4Any(); int bound_port = 0; // Create two socketpairs with the exact same configuration. for (auto& sockets : socket_pairs) { ASSERT_THAT(setsockopt(sockets->first_fd(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallSucceeds()); ASSERT_THAT(setsockopt(sockets->second_fd(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(setsockopt(sockets->second_fd(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); ASSERT_THAT(bind(sockets->second_fd(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); // Get the port assigned. socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(sockets->second_fd(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // On the first iteration, save the port we are bound to. On the second // iteration, verify the port is the same as the one from the first // iteration. In other words, both sockets listen on the same port. if (bound_port == 0) { bound_port = reinterpret_cast(&receiver_addr.addr)->sin_port; } else { EXPECT_EQ(bound_port, reinterpret_cast(&receiver_addr.addr)->sin_port); } } // Drop the membership of the first socket pair and verify data is still // received. ASSERT_THAT(setsockopt(socket_pairs[0]->second_fd(), IPPROTO_IP, IP_DROP_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a packet from each socket_pair. auto send_addr = V4Multicast(); reinterpret_cast(&send_addr.addr)->sin_port = bound_port; for (auto& sockets : socket_pairs) { char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT( RetryEINTR(sendto)(sockets->first_fd(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&send_addr.addr), send_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we received the multicast packet on both sockets. for (auto& sockets : socket_pairs) { char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT( RetryEINTR(recv)(sockets->second_fd(), recv_buf, sizeof(recv_buf), 0), SyscallSucceedsWithValue(sizeof(recv_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } } // Drop the membership of the second socket pair and verify data stops being // received. ASSERT_THAT(setsockopt(socket_pairs[1]->second_fd(), IPPROTO_IP, IP_DROP_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a packet from each socket_pair. for (auto& sockets : socket_pairs) { char send_buf[200]; ASSERT_THAT( RetryEINTR(sendto)(sockets->first_fd(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&send_addr.addr), send_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); char recv_buf[sizeof(send_buf)] = {}; for (auto& sockets : socket_pairs) { ASSERT_THAT(RetryEINTR(recv)(sockets->second_fd(), recv_buf, sizeof(recv_buf), MSG_DONTWAIT), SyscallFailsWithErrno(EAGAIN)); } } } // Check that a receiving socket can bind to the multicast address before // joining the group and receive data once the group has been joined. TEST_P(IPv4UDPUnboundSocketTest, TestBindToMcastThenJoinThenReceive) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind second socket (receiver) to the multicast address. auto receiver_addr = V4Multicast(); ASSERT_THAT( bind(socket2->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); // Update receiver_addr with the correct port number. socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket2->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Register to receive multicast packets. ip_mreqn group = {}; group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress); group.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo")); ASSERT_THAT(setsockopt(socket2->get(), IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group)), SyscallSucceeds()); // Send a multicast packet on the first socket out the loopback interface. ip_mreq iface = {}; iface.imr_interface.s_addr = htonl(INADDR_LOOPBACK); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallSucceeds()); auto sendto_addr = V4Multicast(); reinterpret_cast(&sendto_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&sendto_addr.addr), sendto_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we received the multicast packet. char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT(RetryEINTR(recv)(socket2->get(), recv_buf, sizeof(recv_buf), MSG_DONTWAIT), SyscallSucceedsWithValue(sizeof(recv_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } // Check that a receiving socket can bind to the multicast address and won't // receive multicast data if it hasn't joined the group. TEST_P(IPv4UDPUnboundSocketTest, TestBindToMcastThenNoJoinThenNoReceive) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind second socket (receiver) to the multicast address. auto receiver_addr = V4Multicast(); ASSERT_THAT( bind(socket2->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); // Update receiver_addr with the correct port number. socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket2->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Send a multicast packet on the first socket out the loopback interface. ip_mreq iface = {}; iface.imr_interface.s_addr = htonl(INADDR_LOOPBACK); ASSERT_THAT(setsockopt(socket1->get(), IPPROTO_IP, IP_MULTICAST_IF, &iface, sizeof(iface)), SyscallSucceeds()); auto sendto_addr = V4Multicast(); reinterpret_cast(&sendto_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&sendto_addr.addr), sendto_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we don't receive the multicast packet. char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT(RetryEINTR(recv)(socket2->get(), recv_buf, sizeof(recv_buf), MSG_DONTWAIT), SyscallFailsWithErrno(EAGAIN)); } // Check that a socket can bind to a multicast address and still send out // packets. TEST_P(IPv4UDPUnboundSocketTest, TestBindToMcastThenSend) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind second socket (receiver) to the ANY address. auto receiver_addr = V4Any(); ASSERT_THAT( bind(socket2->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket2->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Bind the first socket (sender) to the multicast address. auto sender_addr = V4Multicast(); ASSERT_THAT( bind(socket1->get(), reinterpret_cast(&sender_addr.addr), sender_addr.addr_len), SyscallSucceeds()); socklen_t sender_addr_len = sender_addr.addr_len; ASSERT_THAT(getsockname(socket1->get(), reinterpret_cast(&sender_addr.addr), &sender_addr_len), SyscallSucceeds()); EXPECT_EQ(sender_addr_len, sender_addr.addr_len); // Send a packet on the first socket to the loopback address. auto sendto_addr = V4Loopback(); reinterpret_cast(&sendto_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&sendto_addr.addr), sendto_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we received the packet. char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT(RetryEINTR(recv)(socket2->get(), recv_buf, sizeof(recv_buf), MSG_DONTWAIT), SyscallSucceedsWithValue(sizeof(recv_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } // Check that a receiving socket can bind to the broadcast address and receive // broadcast packets. TEST_P(IPv4UDPUnboundSocketTest, TestBindToBcastThenReceive) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind second socket (receiver) to the broadcast address. auto receiver_addr = V4Broadcast(); ASSERT_THAT( bind(socket2->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket2->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Send a broadcast packet on the first socket out the loopback interface. EXPECT_THAT(setsockopt(socket1->get(), SOL_SOCKET, SO_BROADCAST, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceedsWithValue(0)); // Note: Binding to the loopback interface makes the broadcast go out of it. auto sender_bind_addr = V4Loopback(); ASSERT_THAT( bind(socket1->get(), reinterpret_cast(&sender_bind_addr.addr), sender_bind_addr.addr_len), SyscallSucceeds()); auto sendto_addr = V4Broadcast(); reinterpret_cast(&sendto_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&sendto_addr.addr), sendto_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we received the multicast packet. char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT(RetryEINTR(recv)(socket2->get(), recv_buf, sizeof(recv_buf), MSG_DONTWAIT), SyscallSucceedsWithValue(sizeof(recv_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } // Check that a socket can bind to the broadcast address and still send out // packets. TEST_P(IPv4UDPUnboundSocketTest, TestBindToBcastThenSend) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind second socket (receiver) to the ANY address. auto receiver_addr = V4Any(); ASSERT_THAT( bind(socket2->get(), reinterpret_cast(&receiver_addr.addr), receiver_addr.addr_len), SyscallSucceeds()); socklen_t receiver_addr_len = receiver_addr.addr_len; ASSERT_THAT(getsockname(socket2->get(), reinterpret_cast(&receiver_addr.addr), &receiver_addr_len), SyscallSucceeds()); EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len); // Bind the first socket (sender) to the broadcast address. auto sender_addr = V4Broadcast(); ASSERT_THAT( bind(socket1->get(), reinterpret_cast(&sender_addr.addr), sender_addr.addr_len), SyscallSucceeds()); socklen_t sender_addr_len = sender_addr.addr_len; ASSERT_THAT(getsockname(socket1->get(), reinterpret_cast(&sender_addr.addr), &sender_addr_len), SyscallSucceeds()); EXPECT_EQ(sender_addr_len, sender_addr.addr_len); // Send a packet on the first socket to the loopback address. auto sendto_addr = V4Loopback(); reinterpret_cast(&sendto_addr.addr)->sin_port = reinterpret_cast(&receiver_addr.addr)->sin_port; char send_buf[200]; RandomizeBuffer(send_buf, sizeof(send_buf)); ASSERT_THAT(RetryEINTR(sendto)(socket1->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&sendto_addr.addr), sendto_addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Check that we received the packet. char recv_buf[sizeof(send_buf)] = {}; ASSERT_THAT(RetryEINTR(recv)(socket2->get(), recv_buf, sizeof(recv_buf), MSG_DONTWAIT), SyscallSucceedsWithValue(sizeof(recv_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } // Check that SO_REUSEADDR always delivers to the most recently bound socket. TEST_P(IPv4UDPUnboundSocketTest, ReuseAddrDistribution) { // FIXME(b/129164367): Support SO_REUSEADDR on UDP sockets. SKIP_IF(IsRunningOnGvisor()); std::vector> sockets; sockets.emplace_back(ASSERT_NO_ERRNO_AND_VALUE(NewSocket())); ASSERT_THAT(setsockopt(sockets[0]->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); // Bind the first socket to the loopback and take note of the selected port. auto addr = V4Loopback(); ASSERT_THAT(bind(sockets[0]->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); socklen_t addr_len = addr.addr_len; ASSERT_THAT(getsockname(sockets[0]->get(), reinterpret_cast(&addr.addr), &addr_len), SyscallSucceeds()); EXPECT_EQ(addr_len, addr.addr_len); constexpr int kMessageSize = 200; for (int i = 0; i < 10; i++) { // Add a new receiver. sockets.emplace_back(ASSERT_NO_ERRNO_AND_VALUE(NewSocket())); auto& last = sockets.back(); ASSERT_THAT(setsockopt(last->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(bind(last->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); // Send a new message to the SO_REUSEADDR group. We use a new socket each // time so that a new ephemeral port will be used each time. This ensures // that we aren't doing REUSEPORT-like hash load blancing. auto sender = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); char send_buf[kMessageSize]; RandomizeBuffer(send_buf, sizeof(send_buf)); EXPECT_THAT(RetryEINTR(sendto)(sender->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); // Verify that the most recent socket got the message. We don't expect any // of the other sockets to have received it, but we will check that later. char recv_buf[sizeof(send_buf)] = {}; EXPECT_THAT( RetryEINTR(recv)(last->get(), recv_buf, sizeof(recv_buf), MSG_DONTWAIT), SyscallSucceedsWithValue(sizeof(send_buf))); EXPECT_EQ(0, memcmp(send_buf, recv_buf, sizeof(send_buf))); } // Verify that no other messages were received. for (auto& socket : sockets) { char recv_buf[kMessageSize] = {}; EXPECT_THAT(RetryEINTR(recv)(socket->get(), recv_buf, sizeof(recv_buf), MSG_DONTWAIT), SyscallFailsWithErrno(EAGAIN)); } } TEST_P(IPv4UDPUnboundSocketTest, BindReuseAddrThenReusePort) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind socket1 with REUSEADDR. ASSERT_THAT(setsockopt(socket1->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); // Bind the first socket to the loopback and take note of the selected port. auto addr = V4Loopback(); ASSERT_THAT(bind(socket1->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); socklen_t addr_len = addr.addr_len; ASSERT_THAT(getsockname(socket1->get(), reinterpret_cast(&addr.addr), &addr_len), SyscallSucceeds()); EXPECT_EQ(addr_len, addr.addr_len); // Bind socket2 to the same address as socket1, only with REUSEPORT. ASSERT_THAT(setsockopt(socket2->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(bind(socket2->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallFailsWithErrno(EADDRINUSE)); } TEST_P(IPv4UDPUnboundSocketTest, BindReusePortThenReuseAddr) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind socket1 with REUSEPORT. ASSERT_THAT(setsockopt(socket1->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); // Bind the first socket to the loopback and take note of the selected port. auto addr = V4Loopback(); ASSERT_THAT(bind(socket1->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); socklen_t addr_len = addr.addr_len; ASSERT_THAT(getsockname(socket1->get(), reinterpret_cast(&addr.addr), &addr_len), SyscallSucceeds()); EXPECT_EQ(addr_len, addr.addr_len); // Bind socket2 to the same address as socket1, only with REUSEADDR. ASSERT_THAT(setsockopt(socket2->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(bind(socket2->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallFailsWithErrno(EADDRINUSE)); } TEST_P(IPv4UDPUnboundSocketTest, BindReuseAddrReusePortConvertibleToReusePort) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket3 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind socket1 with REUSEADDR and REUSEPORT. ASSERT_THAT(setsockopt(socket1->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(setsockopt(socket1->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); // Bind the first socket to the loopback and take note of the selected port. auto addr = V4Loopback(); ASSERT_THAT(bind(socket1->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); socklen_t addr_len = addr.addr_len; ASSERT_THAT(getsockname(socket1->get(), reinterpret_cast(&addr.addr), &addr_len), SyscallSucceeds()); EXPECT_EQ(addr_len, addr.addr_len); // Bind socket2 to the same address as socket1, only with REUSEPORT. ASSERT_THAT(setsockopt(socket2->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(bind(socket2->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); // Bind socket3 to the same address as socket1, only with REUSEADDR. ASSERT_THAT(setsockopt(socket3->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(bind(socket3->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallFailsWithErrno(EADDRINUSE)); } TEST_P(IPv4UDPUnboundSocketTest, BindReuseAddrReusePortConvertibleToReuseAddr) { // FIXME(b/129164367): Support SO_REUSEADDR on UDP sockets. SKIP_IF(IsRunningOnGvisor()); auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket3 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind socket1 with REUSEADDR and REUSEPORT. ASSERT_THAT(setsockopt(socket1->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(setsockopt(socket1->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); // Bind the first socket to the loopback and take note of the selected port. auto addr = V4Loopback(); ASSERT_THAT(bind(socket1->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); socklen_t addr_len = addr.addr_len; ASSERT_THAT(getsockname(socket1->get(), reinterpret_cast(&addr.addr), &addr_len), SyscallSucceeds()); EXPECT_EQ(addr_len, addr.addr_len); // Bind socket2 to the same address as socket1, only with REUSEADDR. ASSERT_THAT(setsockopt(socket2->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(bind(socket2->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); // Bind socket3 to the same address as socket1, only with REUSEPORT. ASSERT_THAT(setsockopt(socket3->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(bind(socket3->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallFailsWithErrno(EADDRINUSE)); } TEST_P(IPv4UDPUnboundSocketTest, BindReuseAddrReusePortConversionReversable1) { // FIXME(b/129164367): Support SO_REUSEADDR on UDP sockets. SKIP_IF(IsRunningOnGvisor()); auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket3 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind socket1 with REUSEADDR and REUSEPORT. ASSERT_THAT(setsockopt(socket1->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(setsockopt(socket1->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); // Bind the first socket to the loopback and take note of the selected port. auto addr = V4Loopback(); ASSERT_THAT(bind(socket1->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); socklen_t addr_len = addr.addr_len; ASSERT_THAT(getsockname(socket1->get(), reinterpret_cast(&addr.addr), &addr_len), SyscallSucceeds()); EXPECT_EQ(addr_len, addr.addr_len); // Bind socket2 to the same address as socket1, only with REUSEPORT. ASSERT_THAT(setsockopt(socket2->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(bind(socket2->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); // Close socket2 to revert to just socket1 with REUSEADDR and REUSEPORT. socket2->reset(); // Bind socket3 to the same address as socket1, only with REUSEADDR. ASSERT_THAT(setsockopt(socket3->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(bind(socket3->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); } TEST_P(IPv4UDPUnboundSocketTest, BindReuseAddrReusePortConversionReversable2) { // FIXME(b/129164367): Support SO_REUSEADDR on UDP sockets. SKIP_IF(IsRunningOnGvisor()); auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket3 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind socket1 with REUSEADDR and REUSEPORT. ASSERT_THAT(setsockopt(socket1->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(setsockopt(socket1->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); // Bind the first socket to the loopback and take note of the selected port. auto addr = V4Loopback(); ASSERT_THAT(bind(socket1->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); socklen_t addr_len = addr.addr_len; ASSERT_THAT(getsockname(socket1->get(), reinterpret_cast(&addr.addr), &addr_len), SyscallSucceeds()); EXPECT_EQ(addr_len, addr.addr_len); // Bind socket2 to the same address as socket1, only with REUSEADDR. ASSERT_THAT(setsockopt(socket2->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(bind(socket2->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); // Close socket2 to revert to just socket1 with REUSEADDR and REUSEPORT. socket2->reset(); // Bind socket3 to the same address as socket1, only with REUSEPORT. ASSERT_THAT(setsockopt(socket3->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(bind(socket3->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); } TEST_P(IPv4UDPUnboundSocketTest, BindDoubleReuseAddrReusePortThenReusePort) { auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket3 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind socket1 with REUSEADDR and REUSEPORT. ASSERT_THAT(setsockopt(socket1->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(setsockopt(socket1->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); // Bind the first socket to the loopback and take note of the selected port. auto addr = V4Loopback(); ASSERT_THAT(bind(socket1->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); socklen_t addr_len = addr.addr_len; ASSERT_THAT(getsockname(socket1->get(), reinterpret_cast(&addr.addr), &addr_len), SyscallSucceeds()); EXPECT_EQ(addr_len, addr.addr_len); // Bind socket2 to the same address as socket1, also with REUSEADDR and // REUSEPORT. ASSERT_THAT(setsockopt(socket2->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(setsockopt(socket2->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(bind(socket2->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); // Bind socket3 to the same address as socket1, only with REUSEPORT. ASSERT_THAT(setsockopt(socket3->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(bind(socket3->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); } TEST_P(IPv4UDPUnboundSocketTest, BindDoubleReuseAddrReusePortThenReuseAddr) { // FIXME(b/129164367): Support SO_REUSEADDR on UDP sockets. SKIP_IF(IsRunningOnGvisor()); auto socket1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto socket3 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); // Bind socket1 with REUSEADDR and REUSEPORT. ASSERT_THAT(setsockopt(socket1->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(setsockopt(socket1->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); // Bind the first socket to the loopback and take note of the selected port. auto addr = V4Loopback(); ASSERT_THAT(bind(socket1->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); socklen_t addr_len = addr.addr_len; ASSERT_THAT(getsockname(socket1->get(), reinterpret_cast(&addr.addr), &addr_len), SyscallSucceeds()); EXPECT_EQ(addr_len, addr.addr_len); // Bind socket2 to the same address as socket1, also with REUSEADDR and // REUSEPORT. ASSERT_THAT(setsockopt(socket2->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(setsockopt(socket2->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(bind(socket2->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); // Bind socket3 to the same address as socket1, only with REUSEADDR. ASSERT_THAT(setsockopt(socket3->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(bind(socket3->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); } // Check that REUSEPORT takes precedence over REUSEADDR. TEST_P(IPv4UDPUnboundSocketTest, ReuseAddrReusePortDistribution) { auto receiver1 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); auto receiver2 = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); ASSERT_THAT(setsockopt(receiver1->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(setsockopt(receiver1->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); // Bind the first socket to the loopback and take note of the selected port. auto addr = V4Loopback(); ASSERT_THAT(bind(receiver1->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); socklen_t addr_len = addr.addr_len; ASSERT_THAT(getsockname(receiver1->get(), reinterpret_cast(&addr.addr), &addr_len), SyscallSucceeds()); EXPECT_EQ(addr_len, addr.addr_len); // Bind receiver2 to the same address as socket1, also with REUSEADDR and // REUSEPORT. ASSERT_THAT(setsockopt(receiver2->get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(setsockopt(receiver2->get(), SOL_SOCKET, SO_REUSEPORT, &kSockOptOn, sizeof(kSockOptOn)), SyscallSucceeds()); ASSERT_THAT(bind(receiver2->get(), reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceeds()); constexpr int kMessageSize = 10; for (int i = 0; i < 100; ++i) { // Send a new message to the REUSEADDR/REUSEPORT group. We use a new socket // each time so that a new ephemerial port will be used each time. This // ensures that we cycle through hashes. auto sender = ASSERT_NO_ERRNO_AND_VALUE(NewSocket()); char send_buf[kMessageSize] = {}; EXPECT_THAT(RetryEINTR(sendto)(sender->get(), send_buf, sizeof(send_buf), 0, reinterpret_cast(&addr.addr), addr.addr_len), SyscallSucceedsWithValue(sizeof(send_buf))); } // Check that both receivers got messages. This checks that we are using load // balancing (REUSEPORT) instead of the most recently bound socket // (REUSEADDR). char recv_buf[kMessageSize] = {}; EXPECT_THAT(RetryEINTR(recv)(receiver1->get(), recv_buf, sizeof(recv_buf), MSG_DONTWAIT), SyscallSucceedsWithValue(kMessageSize)); EXPECT_THAT(RetryEINTR(recv)(receiver2->get(), recv_buf, sizeof(recv_buf), MSG_DONTWAIT), SyscallSucceedsWithValue(kMessageSize)); } } // namespace testing } // namespace gvisor