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-rw-r--r--test/syscalls/linux/proc_net_unix.cc178
1 files changed, 178 insertions, 0 deletions
diff --git a/test/syscalls/linux/proc_net_unix.cc b/test/syscalls/linux/proc_net_unix.cc
index 6d745f728..82d325c17 100644
--- a/test/syscalls/linux/proc_net_unix.cc
+++ b/test/syscalls/linux/proc_net_unix.cc
@@ -34,6 +34,16 @@ using absl::StrFormat;
constexpr char kProcNetUnixHeader[] =
"Num RefCount Protocol Flags Type St Inode Path";
+// Possible values of the "st" field in a /proc/net/unix entry. Source: Linux
+// kernel, include/uapi/linux/net.h.
+enum {
+ SS_FREE = 0, // Not allocated
+ SS_UNCONNECTED, // Unconnected to any socket
+ SS_CONNECTING, // In process of connecting
+ SS_CONNECTED, // Connected to socket
+ SS_DISCONNECTING // In process of disconnecting
+};
+
// UnixEntry represents a single entry from /proc/net/unix.
struct UnixEntry {
uintptr_t addr;
@@ -71,7 +81,12 @@ PosixErrorOr<std::vector<UnixEntry>> ProcNetUnixEntries() {
bool skipped_header = false;
std::vector<UnixEntry> entries;
std::vector<std::string> lines = absl::StrSplit(content, absl::ByAnyChar("\n"));
+ std::cerr << "<contents of /proc/net/unix>" << std::endl;
for (std::string line : lines) {
+ // Emit the proc entry to the test output to provide context for the test
+ // results.
+ std::cerr << line << std::endl;
+
if (!skipped_header) {
EXPECT_EQ(line, kProcNetUnixHeader);
skipped_header = true;
@@ -139,6 +154,7 @@ PosixErrorOr<std::vector<UnixEntry>> ProcNetUnixEntries() {
entries.push_back(entry);
}
+ std::cerr << "<end of /proc/net/unix>" << std::endl;
return entries;
}
@@ -241,6 +257,168 @@ TEST(ProcNetUnix, SocketPair) {
EXPECT_EQ(entries.size(), 2);
}
+TEST(ProcNetUnix, StreamSocketStateUnconnectedOnBind) {
+ auto sockets = ASSERT_NO_ERRNO_AND_VALUE(
+ AbstractUnboundUnixDomainSocketPair(SOCK_STREAM).Create());
+
+ ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
+ sockets->first_addr_size()),
+ SyscallSucceeds());
+
+ std::vector<UnixEntry> entries =
+ ASSERT_NO_ERRNO_AND_VALUE(ProcNetUnixEntries());
+
+ const std::string address = ExtractPath(sockets->first_addr());
+ UnixEntry bind_entry;
+ ASSERT_TRUE(FindByPath(entries, &bind_entry, address));
+ EXPECT_EQ(bind_entry.state, SS_UNCONNECTED);
+}
+
+TEST(ProcNetUnix, StreamSocketStateStateUnconnectedOnListen) {
+ auto sockets = ASSERT_NO_ERRNO_AND_VALUE(
+ AbstractUnboundUnixDomainSocketPair(SOCK_STREAM).Create());
+
+ ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
+ sockets->first_addr_size()),
+ SyscallSucceeds());
+
+ std::vector<UnixEntry> entries =
+ ASSERT_NO_ERRNO_AND_VALUE(ProcNetUnixEntries());
+
+ const std::string address = ExtractPath(sockets->first_addr());
+ UnixEntry bind_entry;
+ ASSERT_TRUE(FindByPath(entries, &bind_entry, address));
+ EXPECT_EQ(bind_entry.state, SS_UNCONNECTED);
+
+ ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
+
+ entries = ASSERT_NO_ERRNO_AND_VALUE(ProcNetUnixEntries());
+ UnixEntry listen_entry;
+ ASSERT_TRUE(
+ FindByPath(entries, &listen_entry, ExtractPath(sockets->first_addr())));
+ EXPECT_EQ(listen_entry.state, SS_UNCONNECTED);
+ // The bind and listen entries should refer to the same socket.
+ EXPECT_EQ(listen_entry.inode, bind_entry.inode);
+}
+
+TEST(ProcNetUnix, StreamSocketStateStateConnectedOnAccept) {
+ auto sockets = ASSERT_NO_ERRNO_AND_VALUE(
+ AbstractUnboundUnixDomainSocketPair(SOCK_STREAM).Create());
+ const std::string address = ExtractPath(sockets->first_addr());
+ ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
+ sockets->first_addr_size()),
+ SyscallSucceeds());
+ ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
+ std::vector<UnixEntry> entries =
+ ASSERT_NO_ERRNO_AND_VALUE(ProcNetUnixEntries());
+ UnixEntry listen_entry;
+ ASSERT_TRUE(
+ FindByPath(entries, &listen_entry, ExtractPath(sockets->first_addr())));
+
+ ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
+ sockets->first_addr_size()),
+ SyscallSucceeds());
+
+ int clientfd;
+ ASSERT_THAT(clientfd = accept(sockets->first_fd(), nullptr, nullptr),
+ SyscallSucceeds());
+
+ // Find the entry for the accepted socket. UDS proc entries don't have a
+ // remote address, so we distinguish the accepted socket from the listen
+ // socket by checking for a different inode.
+ entries = ASSERT_NO_ERRNO_AND_VALUE(ProcNetUnixEntries());
+ UnixEntry accept_entry;
+ ASSERT_TRUE(FindBy(
+ entries, &accept_entry, [address, listen_entry](const UnixEntry& e) {
+ return e.path == address && e.inode != listen_entry.inode;
+ }));
+ EXPECT_EQ(accept_entry.state, SS_CONNECTED);
+ // Listen entry should still be in SS_UNCONNECTED state.
+ ASSERT_TRUE(FindBy(entries, &listen_entry,
+ [&sockets, listen_entry](const UnixEntry& e) {
+ return e.path == ExtractPath(sockets->first_addr()) &&
+ e.inode == listen_entry.inode;
+ }));
+ EXPECT_EQ(listen_entry.state, SS_UNCONNECTED);
+}
+
+TEST(ProcNetUnix, DgramSocketStateDisconnectingOnBind) {
+ auto sockets = ASSERT_NO_ERRNO_AND_VALUE(
+ AbstractUnboundUnixDomainSocketPair(SOCK_DGRAM).Create());
+
+ std::vector<UnixEntry> entries =
+ ASSERT_NO_ERRNO_AND_VALUE(ProcNetUnixEntries());
+
+ // On gVisor, the only two UDS on the system are the ones we just created and
+ // we rely on this to locate the test socket entries in the remainder of the
+ // test. On a generic Linux system, we have no easy way to locate the
+ // corresponding entries, as they don't have an address yet.
+ if (IsRunningOnGvisor()) {
+ ASSERT_EQ(entries.size(), 2);
+ for (auto e : entries) {
+ ASSERT_EQ(e.state, SS_DISCONNECTING);
+ }
+ }
+
+ ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
+ sockets->first_addr_size()),
+ SyscallSucceeds());
+
+ entries = ASSERT_NO_ERRNO_AND_VALUE(ProcNetUnixEntries());
+ const std::string address = ExtractPath(sockets->first_addr());
+ UnixEntry bind_entry;
+ ASSERT_TRUE(FindByPath(entries, &bind_entry, address));
+ EXPECT_EQ(bind_entry.state, SS_UNCONNECTED);
+}
+
+TEST(ProcNetUnix, DgramSocketStateConnectingOnConnect) {
+ auto sockets = ASSERT_NO_ERRNO_AND_VALUE(
+ AbstractUnboundUnixDomainSocketPair(SOCK_DGRAM).Create());
+
+ std::vector<UnixEntry> entries =
+ ASSERT_NO_ERRNO_AND_VALUE(ProcNetUnixEntries());
+
+ // On gVisor, the only two UDS on the system are the ones we just created and
+ // we rely on this to locate the test socket entries in the remainder of the
+ // test. On a generic Linux system, we have no easy way to locate the
+ // corresponding entries, as they don't have an address yet.
+ if (IsRunningOnGvisor()) {
+ ASSERT_EQ(entries.size(), 2);
+ for (auto e : entries) {
+ ASSERT_EQ(e.state, SS_DISCONNECTING);
+ }
+ }
+
+ ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
+ sockets->first_addr_size()),
+ SyscallSucceeds());
+
+ entries = ASSERT_NO_ERRNO_AND_VALUE(ProcNetUnixEntries());
+ const std::string address = ExtractPath(sockets->first_addr());
+ UnixEntry bind_entry;
+ ASSERT_TRUE(FindByPath(entries, &bind_entry, address));
+
+ ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
+ sockets->first_addr_size()),
+ SyscallSucceeds());
+
+ entries = ASSERT_NO_ERRNO_AND_VALUE(ProcNetUnixEntries());
+
+ // Once again, we have no easy way to identify the connecting socket as it has
+ // no listed address. We can only identify the entry as the "non-bind socket
+ // entry" on gVisor, where we're guaranteed to have only the two entries we
+ // create during this test.
+ if (IsRunningOnGvisor()) {
+ ASSERT_EQ(entries.size(), 2);
+ UnixEntry connect_entry;
+ ASSERT_TRUE(
+ FindBy(entries, &connect_entry, [bind_entry](const UnixEntry& e) {
+ return e.inode != bind_entry.inode;
+ }));
+ EXPECT_EQ(connect_entry.state, SS_CONNECTING);
+ }
+}
+
} // namespace
} // namespace testing
} // namespace gvisor
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