Open source system call tests.

PiperOrigin-RevId: 224886231
Change-Id: I0fccb4d994601739d8b16b1d4e6b31f40297fb22

1 files changed, 174 insertions, 0 deletions

diff --git a/test/syscalls/linux/socket_non_stream.cc b/test/syscalls/linux/socket_non_stream.cc
new file mode 100644
index 000000000..d49aab363
--- /dev/null
+++ b/test/syscalls/linux/socket_non_stream.cc
@@ -0,0 +1,174 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "test/syscalls/linux/socket_non_stream.h"
+
+#include <stdio.h>
+#include <sys/un.h>
+
+#include "gtest/gtest.h"
+#include "gtest/gtest.h"
+#include "test/syscalls/linux/ip_socket_test_util.h"
+#include "test/syscalls/linux/socket_test_util.h"
+#include "test/syscalls/linux/unix_domain_socket_test_util.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+TEST_P(NonStreamSocketPairTest, SendMsgTooLarge) {
+  auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
+
+  int sndbuf;
+  socklen_t length = sizeof(sndbuf);
+  ASSERT_THAT(
+      getsockopt(sockets->first_fd(), SOL_SOCKET, SO_SNDBUF, &sndbuf, &length),
+      SyscallSucceeds());
+
+  // Make the call too large to fit in the send buffer.
+  const int buffer_size = 3 * sndbuf;
+
+  EXPECT_THAT(SendLargeSendMsg(sockets, buffer_size, false /* reader */),
+              SyscallFailsWithErrno(EMSGSIZE));
+}
+
+// Stream sockets allow data sent with a single (e.g. write, sendmsg) syscall
+// to be read in pieces with multiple (e.g. read, recvmsg) syscalls.
+//
+// SplitRecv checks that control messages can only be read on the first (e.g.
+// read, recvmsg) syscall, even if it doesn't provide space for the control
+// message.
+TEST_P(NonStreamSocketPairTest, SplitRecv) {
+  auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
+  char sent_data[512];
+  RandomizeBuffer(sent_data, sizeof(sent_data));
+  ASSERT_THAT(
+      RetryEINTR(send)(sockets->first_fd(), sent_data, sizeof(sent_data), 0),
+      SyscallSucceedsWithValue(sizeof(sent_data)));
+  char received_data[sizeof(sent_data) / 2];
+  ASSERT_THAT(RetryEINTR(recv)(sockets->second_fd(), received_data,
+                               sizeof(received_data), 0),
+              SyscallSucceedsWithValue(sizeof(received_data)));
+  EXPECT_EQ(0, memcmp(sent_data, received_data, sizeof(received_data)));
+  ASSERT_THAT(RetryEINTR(recv)(sockets->second_fd(), received_data,
+                               sizeof(received_data), MSG_DONTWAIT),
+              SyscallFailsWithErrno(EWOULDBLOCK));
+}
+
+// Stream sockets allow data sent with multiple sends to be read in a single
+// recv. Datagram sockets do not.
+//
+// SingleRecv checks that only a single message is readable in a single recv.
+TEST_P(NonStreamSocketPairTest, SingleRecv) {
+  auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
+  char sent_data1[20];
+  RandomizeBuffer(sent_data1, sizeof(sent_data1));
+  ASSERT_THAT(
+      RetryEINTR(send)(sockets->first_fd(), sent_data1, sizeof(sent_data1), 0),
+      SyscallSucceedsWithValue(sizeof(sent_data1)));
+  char sent_data2[20];
+  RandomizeBuffer(sent_data2, sizeof(sent_data2));
+  ASSERT_THAT(
+      RetryEINTR(send)(sockets->first_fd(), sent_data2, sizeof(sent_data2), 0),
+      SyscallSucceedsWithValue(sizeof(sent_data2)));
+  char received_data[sizeof(sent_data1) + sizeof(sent_data2)];
+  ASSERT_THAT(RetryEINTR(recv)(sockets->second_fd(), received_data,
+                               sizeof(received_data), 0),
+              SyscallSucceedsWithValue(sizeof(sent_data1)));
+  EXPECT_EQ(0, memcmp(sent_data1, received_data, sizeof(sent_data1)));
+}
+
+// Stream sockets allow data sent with multiple sends to be peeked at in a
+// single recv. Datagram sockets (except for unix sockets) do not.
+//
+// SinglePeek checks that only a single message is peekable in a single recv.
+TEST_P(NonStreamSocketPairTest, SinglePeek) {
+  auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
+  char sent_data1[20];
+  RandomizeBuffer(sent_data1, sizeof(sent_data1));
+  ASSERT_THAT(
+      RetryEINTR(send)(sockets->first_fd(), sent_data1, sizeof(sent_data1), 0),
+      SyscallSucceedsWithValue(sizeof(sent_data1)));
+  char sent_data2[20];
+  RandomizeBuffer(sent_data2, sizeof(sent_data2));
+  ASSERT_THAT(
+      RetryEINTR(send)(sockets->first_fd(), sent_data2, sizeof(sent_data2), 0),
+      SyscallSucceedsWithValue(sizeof(sent_data2)));
+  char received_data[sizeof(sent_data1) + sizeof(sent_data2)];
+  for (int i = 0; i < 3; i++) {
+    memset(received_data, 0, sizeof(received_data));
+    ASSERT_THAT(RetryEINTR(recv)(sockets->second_fd(), received_data,
+                                 sizeof(received_data), MSG_PEEK),
+                SyscallSucceedsWithValue(sizeof(sent_data1)));
+    EXPECT_EQ(0, memcmp(sent_data1, received_data, sizeof(sent_data1)));
+  }
+  ASSERT_THAT(RetryEINTR(recv)(sockets->second_fd(), received_data,
+                               sizeof(sent_data1), 0),
+              SyscallSucceedsWithValue(sizeof(sent_data1)));
+  EXPECT_EQ(0, memcmp(sent_data1, received_data, sizeof(sent_data1)));
+  ASSERT_THAT(RetryEINTR(recv)(sockets->second_fd(), received_data,
+                               sizeof(sent_data2), 0),
+              SyscallSucceedsWithValue(sizeof(sent_data2)));
+  EXPECT_EQ(0, memcmp(sent_data2, received_data, sizeof(sent_data2)));
+}
+
+TEST_P(NonStreamSocketPairTest, MsgTruncTruncation) {
+  auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
+  char sent_data[512];
+  RandomizeBuffer(sent_data, sizeof(sent_data));
+  ASSERT_THAT(
+      RetryEINTR(send)(sockets->first_fd(), sent_data, sizeof(sent_data), 0),
+      SyscallSucceedsWithValue(sizeof(sent_data)));
+  char received_data[sizeof(sent_data)] = {};
+  ASSERT_THAT(RetryEINTR(recv)(sockets->second_fd(), received_data,
+                               sizeof(received_data) / 2, MSG_TRUNC),
+              SyscallSucceedsWithValue(sizeof(sent_data)));
+  EXPECT_EQ(0, memcmp(sent_data, received_data, sizeof(sent_data) / 2));
+
+  // Check that we didn't get any extra data.
+  EXPECT_NE(0, memcmp(sent_data + sizeof(sent_data) / 2,
+                      received_data + sizeof(received_data) / 2,
+                      sizeof(sent_data) / 2));
+}
+
+TEST_P(NonStreamSocketPairTest, MsgTruncSameSize) {
+  auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
+  char sent_data[512];
+  RandomizeBuffer(sent_data, sizeof(sent_data));
+  ASSERT_THAT(
+      RetryEINTR(send)(sockets->first_fd(), sent_data, sizeof(sent_data), 0),
+      SyscallSucceedsWithValue(sizeof(sent_data)));
+  char received_data[sizeof(sent_data)];
+  ASSERT_THAT(RetryEINTR(recv)(sockets->second_fd(), received_data,
+                               sizeof(received_data), MSG_TRUNC),
+              SyscallSucceedsWithValue(sizeof(received_data)));
+  EXPECT_EQ(0, memcmp(sent_data, received_data, sizeof(sent_data)));
+}
+
+TEST_P(NonStreamSocketPairTest, MsgTruncNotFull) {
+  auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
+  char sent_data[512];
+  RandomizeBuffer(sent_data, sizeof(sent_data));
+  ASSERT_THAT(
+      RetryEINTR(send)(sockets->first_fd(), sent_data, sizeof(sent_data), 0),
+      SyscallSucceedsWithValue(sizeof(sent_data)));
+  char received_data[2 * sizeof(sent_data)];
+  ASSERT_THAT(RetryEINTR(recv)(sockets->second_fd(), received_data,
+                               sizeof(received_data), MSG_TRUNC),
+              SyscallSucceedsWithValue(sizeof(sent_data)));
+  EXPECT_EQ(0, memcmp(sent_data, received_data, sizeof(sent_data)));
+}
+
+}  // namespace testing
+}  // namespace gvisor