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-rw-r--r--test/syscalls/linux/proc_net_unix.cc444
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diff --git a/test/syscalls/linux/proc_net_unix.cc b/test/syscalls/linux/proc_net_unix.cc
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--- a/test/syscalls/linux/proc_net_unix.cc
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-// 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 "gtest/gtest.h"
-#include "gtest/gtest.h"
-#include "absl/strings/numbers.h"
-#include "absl/strings/str_format.h"
-#include "absl/strings/str_join.h"
-#include "absl/strings/str_split.h"
-#include "test/syscalls/linux/unix_domain_socket_test_util.h"
-#include "test/util/file_descriptor.h"
-#include "test/util/fs_util.h"
-#include "test/util/test_util.h"
-
-namespace gvisor {
-namespace testing {
-namespace {
-
-using absl::StrCat;
-using absl::StreamFormat;
-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;
- uint64_t refs;
- uint64_t protocol;
- uint64_t flags;
- uint64_t type;
- uint64_t state;
- uint64_t inode;
- std::string path;
-};
-
-// Abstract socket paths can have either trailing null bytes or '@'s as padding
-// at the end, depending on the linux version. This function strips any such
-// padding.
-void StripAbstractPathPadding(std::string* s) {
- const char pad_char = s->back();
- if (pad_char != '\0' && pad_char != '@') {
- return;
- }
-
- const auto last_pos = s->find_last_not_of(pad_char);
- if (last_pos != std::string::npos) {
- s->resize(last_pos + 1);
- }
-}
-
-// Precondition: addr must be a unix socket address (i.e. sockaddr_un) and
-// addr->sun_path must be null-terminated. This is always the case if addr comes
-// from Linux:
-//
-// Per man unix(7):
-//
-// "When the address of a pathname socket is returned (by [getsockname(2)]), its
-// length is
-//
-// offsetof(struct sockaddr_un, sun_path) + strlen(sun_path) + 1
-//
-// and sun_path contains the null-terminated pathname."
-std::string ExtractPath(const struct sockaddr* addr) {
- const char* path =
- reinterpret_cast<const struct sockaddr_un*>(addr)->sun_path;
- // Note: sockaddr_un.sun_path is an embedded character array of length
- // UNIX_PATH_MAX, so we can always safely dereference the first 2 bytes below.
- //
- // We also rely on the path being null-terminated.
- if (path[0] == 0) {
- std::string abstract_path = StrCat("@", &path[1]);
- StripAbstractPathPadding(&abstract_path);
- return abstract_path;
- }
- return std::string(path);
-}
-
-// Returns a parsed representation of /proc/net/unix entries.
-PosixErrorOr<std::vector<UnixEntry>> ProcNetUnixEntries() {
- std::string content;
- RETURN_IF_ERRNO(GetContents("/proc/net/unix", &content));
-
- bool skipped_header = false;
- std::vector<UnixEntry> entries;
- std::vector<std::string> lines = absl::StrSplit(content, '\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;
- continue;
- }
- if (line.empty()) {
- continue;
- }
-
- // Parse a single entry from /proc/net/unix.
- //
- // Sample file:
- //
- // clang-format off
- //
- // Num RefCount Protocol Flags Type St Inode Path"
- // ffffa130e7041c00: 00000002 00000000 00010000 0001 01 1299413685 /tmp/control_server/13293772586877554487
- // ffffa14f547dc400: 00000002 00000000 00010000 0001 01 3793 @remote_coredump
- //
- // clang-format on
- //
- // Note that from the second entry, the inode number can be padded using
- // spaces, so we need to handle it separately during parsing. See
- // net/unix/af_unix.c:unix_seq_show() for how these entries are produced. In
- // particular, only the inode field is padded with spaces.
- UnixEntry entry;
-
- // Process the first 6 fields, up to but not including "Inode".
- std::vector<std::string> fields =
- absl::StrSplit(line, absl::MaxSplits(' ', 6));
-
- if (fields.size() < 7) {
- return PosixError(EINVAL, StrFormat("Invalid entry: '%s'\n", line));
- }
-
- // AtoiBase can't handle the ':' in the "Num" field, so strip it out.
- std::vector<std::string> addr = absl::StrSplit(fields[0], ':');
- ASSIGN_OR_RETURN_ERRNO(entry.addr, AtoiBase(addr[0], 16));
-
- ASSIGN_OR_RETURN_ERRNO(entry.refs, AtoiBase(fields[1], 16));
- ASSIGN_OR_RETURN_ERRNO(entry.protocol, AtoiBase(fields[2], 16));
- ASSIGN_OR_RETURN_ERRNO(entry.flags, AtoiBase(fields[3], 16));
- ASSIGN_OR_RETURN_ERRNO(entry.type, AtoiBase(fields[4], 16));
- ASSIGN_OR_RETURN_ERRNO(entry.state, AtoiBase(fields[5], 16));
-
- absl::string_view rest = absl::StripAsciiWhitespace(fields[6]);
- fields = absl::StrSplit(rest, absl::MaxSplits(' ', 1));
- if (fields.empty()) {
- return PosixError(
- EINVAL, StrFormat("Invalid entry, missing 'Inode': '%s'\n", line));
- }
- ASSIGN_OR_RETURN_ERRNO(entry.inode, AtoiBase(fields[0], 10));
-
- entry.path = "";
- if (fields.size() > 1) {
- entry.path = fields[1];
- StripAbstractPathPadding(&entry.path);
- }
-
- entries.push_back(entry);
- }
- std::cerr << "<end of /proc/net/unix>" << std::endl;
-
- return entries;
-}
-
-// Finds the first entry in 'entries' for which 'predicate' returns true.
-// Returns true on match, and sets 'match' to point to the matching entry.
-bool FindBy(std::vector<UnixEntry> entries, UnixEntry* match,
- std::function<bool(const UnixEntry&)> predicate) {
- for (int i = 0; i < entries.size(); ++i) {
- if (predicate(entries[i])) {
- *match = entries[i];
- return true;
- }
- }
- return false;
-}
-
-bool FindByPath(std::vector<UnixEntry> entries, UnixEntry* match,
- const std::string& path) {
- return FindBy(entries, match,
- [path](const UnixEntry& e) { return e.path == path; });
-}
-
-TEST(ProcNetUnix, Exists) {
- const std::string content =
- ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/net/unix"));
- const std::string header_line = StrCat(kProcNetUnixHeader, "\n");
- if (IsRunningOnGvisor()) {
- // Should be just the header since we don't have any unix domain sockets
- // yet.
- EXPECT_EQ(content, header_line);
- } else {
- // However, on a general linux machine, we could have abitrary sockets on
- // the system, so just check the header.
- EXPECT_THAT(content, ::testing::StartsWith(header_line));
- }
-}
-
-TEST(ProcNetUnix, FilesystemBindAcceptConnect) {
- auto sockets = ASSERT_NO_ERRNO_AND_VALUE(
- FilesystemBoundUnixDomainSocketPair(SOCK_STREAM).Create());
-
- std::string path1 = ExtractPath(sockets->first_addr());
- std::string path2 = ExtractPath(sockets->second_addr());
- std::cerr << StreamFormat("Server socket address (path1): %s\n", path1);
- std::cerr << StreamFormat("Client socket address (path2): %s\n", path2);
-
- std::vector<UnixEntry> entries =
- ASSERT_NO_ERRNO_AND_VALUE(ProcNetUnixEntries());
- if (IsRunningOnGvisor()) {
- EXPECT_EQ(entries.size(), 2);
- }
-
- // The server-side socket's path is listed in the socket entry...
- UnixEntry s1;
- EXPECT_TRUE(FindByPath(entries, &s1, path1));
-
- // ... but the client-side socket's path is not.
- UnixEntry s2;
- EXPECT_FALSE(FindByPath(entries, &s2, path2));
-}
-
-TEST(ProcNetUnix, AbstractBindAcceptConnect) {
- auto sockets = ASSERT_NO_ERRNO_AND_VALUE(
- AbstractBoundUnixDomainSocketPair(SOCK_STREAM).Create());
-
- std::string path1 = ExtractPath(sockets->first_addr());
- std::string path2 = ExtractPath(sockets->second_addr());
- std::cerr << StreamFormat("Server socket address (path1): '%s'\n", path1);
- std::cerr << StreamFormat("Client socket address (path2): '%s'\n", path2);
-
- std::vector<UnixEntry> entries =
- ASSERT_NO_ERRNO_AND_VALUE(ProcNetUnixEntries());
- if (IsRunningOnGvisor()) {
- EXPECT_EQ(entries.size(), 2);
- }
-
- // The server-side socket's path is listed in the socket entry...
- UnixEntry s1;
- EXPECT_TRUE(FindByPath(entries, &s1, path1));
-
- // ... but the client-side socket's path is not.
- UnixEntry s2;
- EXPECT_FALSE(FindByPath(entries, &s2, path2));
-}
-
-TEST(ProcNetUnix, SocketPair) {
- // Under gvisor, ensure a socketpair() syscall creates exactly 2 new
- // entries. We have no way to verify this under Linux, as we have no control
- // over socket creation on a general Linux machine.
- SKIP_IF(!IsRunningOnGvisor());
-
- std::vector<UnixEntry> entries =
- ASSERT_NO_ERRNO_AND_VALUE(ProcNetUnixEntries());
- ASSERT_EQ(entries.size(), 0);
-
- auto sockets =
- ASSERT_NO_ERRNO_AND_VALUE(UnixDomainSocketPair(SOCK_STREAM).Create());
-
- entries = ASSERT_NO_ERRNO_AND_VALUE(ProcNetUnixEntries());
- 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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