Support getsockopt for SO_ACCEPTCONN.

The SO_ACCEPTCONN option is used only on getsockopt(). When this option is
specified, getsockopt() indicates whether socket listening is enabled for
the socket. A value of zero indicates that socket listening is disabled;
non-zero that it is enabled.

PiperOrigin-RevId: 338703206

5 files changed, 108 insertions, 0 deletions

diff --git a/test/syscalls/linux/packet_socket_raw.cc b/test/syscalls/linux/packet_socket_raw.cc
index b558e3a01..a7c46adbf 100644
--- a/test/syscalls/linux/packet_socket_raw.cc
+++ b/test/syscalls/linux/packet_socket_raw.cc
@@ -664,6 +664,17 @@ TEST_P(RawPacketTest, SetAndGetSocketLinger) {
   EXPECT_EQ(0, memcmp(&sl, &got_linger, length));
 }
 
+TEST_P(RawPacketTest, GetSocketAcceptConn) {
+  SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+  int got = -1;
+  socklen_t length = sizeof(got);
+  ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_ACCEPTCONN, &got, &length),
+              SyscallSucceedsWithValue(0));
+
+  ASSERT_EQ(length, sizeof(got));
+  EXPECT_EQ(got, 0);
+}
 INSTANTIATE_TEST_SUITE_P(AllInetTests, RawPacketTest,
                          ::testing::Values(ETH_P_IP, ETH_P_ALL));
 
diff --git a/test/syscalls/linux/raw_socket_icmp.cc b/test/syscalls/linux/raw_socket_icmp.cc
index 1b9dbc584..bd779da92 100644
--- a/test/syscalls/linux/raw_socket_icmp.cc
+++ b/test/syscalls/linux/raw_socket_icmp.cc
@@ -438,6 +438,19 @@ TEST_F(RawSocketICMPTest, SetAndGetSocketLinger) {
   EXPECT_EQ(0, memcmp(&sl, &got_linger, length));
 }
 
+// Test getsockopt for SO_ACCEPTCONN.
+TEST_F(RawSocketICMPTest, GetSocketAcceptConn) {
+  SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+  int got = -1;
+  socklen_t length = sizeof(got);
+  ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_ACCEPTCONN, &got, &length),
+              SyscallSucceedsWithValue(0));
+
+  ASSERT_EQ(length, sizeof(got));
+  EXPECT_EQ(got, 0);
+}
+
 void RawSocketICMPTest::ExpectICMPSuccess(const struct icmphdr& icmp) {
   // We're going to receive both the echo request and reply, but the order is
   // indeterminate.
diff --git a/test/syscalls/linux/socket_ip_udp_generic.cc b/test/syscalls/linux/socket_ip_udp_generic.cc
index 3f2c0fdf2..f69f8f99f 100644
--- a/test/syscalls/linux/socket_ip_udp_generic.cc
+++ b/test/syscalls/linux/socket_ip_udp_generic.cc
@@ -472,5 +472,19 @@ TEST_P(UDPSocketPairTest, SetAndGetSocketLinger) {
   EXPECT_EQ(0, memcmp(&sl, &got_linger, length));
 }
 
+// Test getsockopt for SO_ACCEPTCONN on udp socket.
+TEST_P(UDPSocketPairTest, GetSocketAcceptConn) {
+  auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
+
+  int got = -1;
+  socklen_t length = sizeof(got);
+  ASSERT_THAT(
+      getsockopt(sockets->first_fd(), SOL_SOCKET, SO_ACCEPTCONN, &got, &length),
+      SyscallSucceedsWithValue(0));
+
+  ASSERT_EQ(length, sizeof(got));
+  EXPECT_EQ(got, 0);
+}
+
 }  // namespace testing
 }  // namespace gvisor
diff --git a/test/syscalls/linux/socket_unix_stream.cc b/test/syscalls/linux/socket_unix_stream.cc
index 1edcb15a7..ad9c4bf37 100644
--- a/test/syscalls/linux/socket_unix_stream.cc
+++ b/test/syscalls/linux/socket_unix_stream.cc
@@ -121,6 +121,19 @@ TEST_P(StreamUnixSocketPairTest, SetAndGetSocketLinger) {
   EXPECT_EQ(0, memcmp(&got_linger, &sl, length));
 }
 
+TEST_P(StreamUnixSocketPairTest, GetSocketAcceptConn) {
+  auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
+
+  int got = -1;
+  socklen_t length = sizeof(got);
+  ASSERT_THAT(
+      getsockopt(sockets->first_fd(), SOL_SOCKET, SO_ACCEPTCONN, &got, &length),
+      SyscallSucceedsWithValue(0));
+
+  ASSERT_EQ(length, sizeof(got));
+  EXPECT_EQ(got, 0);
+}
+
 INSTANTIATE_TEST_SUITE_P(
     AllUnixDomainSockets, StreamUnixSocketPairTest,
     ::testing::ValuesIn(IncludeReversals(VecCat<SocketPairKind>(
diff --git a/test/syscalls/linux/tcp_socket.cc b/test/syscalls/linux/tcp_socket.cc
index 9f522f833..ebd873068 100644
--- a/test/syscalls/linux/tcp_socket.cc
+++ b/test/syscalls/linux/tcp_socket.cc
@@ -1725,6 +1725,63 @@ TEST_P(SimpleTcpSocketTest, CloseNonConnectedLingerOption) {
   ASSERT_LT((end_time - start_time), absl::Seconds(kLingerTimeout));
 }
 
+// Tests that SO_ACCEPTCONN returns non zero value for listening sockets.
+TEST_P(TcpSocketTest, GetSocketAcceptConnListener) {
+  int got = -1;
+  socklen_t length = sizeof(got);
+  ASSERT_THAT(getsockopt(listener_, SOL_SOCKET, SO_ACCEPTCONN, &got, &length),
+              SyscallSucceeds());
+  ASSERT_EQ(length, sizeof(got));
+  EXPECT_EQ(got, 1);
+}
+
+// Tests that SO_ACCEPTCONN returns zero value for not listening sockets.
+TEST_P(TcpSocketTest, GetSocketAcceptConnNonListener) {
+  int got = -1;
+  socklen_t length = sizeof(got);
+  ASSERT_THAT(getsockopt(s_, SOL_SOCKET, SO_ACCEPTCONN, &got, &length),
+              SyscallSucceeds());
+  ASSERT_EQ(length, sizeof(got));
+  EXPECT_EQ(got, 0);
+
+  ASSERT_THAT(getsockopt(t_, SOL_SOCKET, SO_ACCEPTCONN, &got, &length),
+              SyscallSucceeds());
+  ASSERT_EQ(length, sizeof(got));
+  EXPECT_EQ(got, 0);
+}
+
+TEST_P(SimpleTcpSocketTest, GetSocketAcceptConnWithShutdown) {
+  // TODO(b/171345701): Fix the TCP state for listening socket on shutdown.
+  SKIP_IF(IsRunningOnGvisor());
+
+  FileDescriptor s =
+      ASSERT_NO_ERRNO_AND_VALUE(Socket(GetParam(), SOCK_STREAM, IPPROTO_TCP));
+
+  // Initialize address to the loopback one.
+  sockaddr_storage addr =
+      ASSERT_NO_ERRNO_AND_VALUE(InetLoopbackAddr(GetParam()));
+  socklen_t addrlen = sizeof(addr);
+
+  // Bind to some port then start listening.
+  ASSERT_THAT(bind(s.get(), reinterpret_cast<struct sockaddr*>(&addr), addrlen),
+              SyscallSucceeds());
+
+  ASSERT_THAT(listen(s.get(), SOMAXCONN), SyscallSucceeds());
+
+  int got = -1;
+  socklen_t length = sizeof(got);
+  ASSERT_THAT(getsockopt(s.get(), SOL_SOCKET, SO_ACCEPTCONN, &got, &length),
+              SyscallSucceeds());
+  ASSERT_EQ(length, sizeof(got));
+  EXPECT_EQ(got, 1);
+
+  EXPECT_THAT(shutdown(s.get(), SHUT_RD), SyscallSucceeds());
+  ASSERT_THAT(getsockopt(s.get(), SOL_SOCKET, SO_ACCEPTCONN, &got, &length),
+              SyscallSucceeds());
+  ASSERT_EQ(length, sizeof(got));
+  EXPECT_EQ(got, 0);
+}
+
 INSTANTIATE_TEST_SUITE_P(AllInetTests, SimpleTcpSocketTest,
                          ::testing::Values(AF_INET, AF_INET6));