497 lines
18 KiB
C++
497 lines
18 KiB
C++
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <netinet/tcp.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "gtest/gtest.h"
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#include "absl/strings/numbers.h"
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#include "absl/strings/str_join.h"
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#include "absl/strings/str_split.h"
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#include "test/syscalls/linux/ip_socket_test_util.h"
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#include "test/util/file_descriptor.h"
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#include "test/util/test_util.h"
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namespace gvisor {
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namespace testing {
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namespace {
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using absl::StrCat;
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using absl::StrSplit;
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constexpr char kProcNetTCPHeader[] =
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" sl local_address rem_address st tx_queue rx_queue tr tm->when "
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"retrnsmt uid timeout inode "
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" ";
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// TCPEntry represents a single entry from /proc/net/tcp.
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struct TCPEntry {
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uint32_t local_addr;
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uint16_t local_port;
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uint32_t remote_addr;
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uint16_t remote_port;
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uint64_t state;
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uint64_t uid;
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uint64_t inode;
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};
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// Finds the first entry in 'entries' for which 'predicate' returns true.
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// Returns true on match, and sets 'match' to a copy of the matching entry. If
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// 'match' is null, it's ignored.
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bool FindBy(const std::vector<TCPEntry>& entries, TCPEntry* match,
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std::function<bool(const TCPEntry&)> predicate) {
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for (const TCPEntry& entry : entries) {
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if (predicate(entry)) {
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if (match != nullptr) {
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*match = entry;
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}
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return true;
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}
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}
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return false;
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}
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bool FindByLocalAddr(const std::vector<TCPEntry>& entries, TCPEntry* match,
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const struct sockaddr* addr) {
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uint32_t host = IPFromInetSockaddr(addr);
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uint16_t port = PortFromInetSockaddr(addr);
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return FindBy(entries, match, [host, port](const TCPEntry& e) {
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return (e.local_addr == host && e.local_port == port);
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});
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}
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bool FindByRemoteAddr(const std::vector<TCPEntry>& entries, TCPEntry* match,
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const struct sockaddr* addr) {
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uint32_t host = IPFromInetSockaddr(addr);
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uint16_t port = PortFromInetSockaddr(addr);
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return FindBy(entries, match, [host, port](const TCPEntry& e) {
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return (e.remote_addr == host && e.remote_port == port);
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});
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}
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// Returns a parsed representation of /proc/net/tcp entries.
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PosixErrorOr<std::vector<TCPEntry>> ProcNetTCPEntries() {
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std::string content;
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RETURN_IF_ERRNO(GetContents("/proc/net/tcp", &content));
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bool found_header = false;
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std::vector<TCPEntry> entries;
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std::vector<std::string> lines = StrSplit(content, '\n');
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std::cerr << "<contents of /proc/net/tcp>" << std::endl;
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for (const std::string& line : lines) {
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std::cerr << line << std::endl;
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if (!found_header) {
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EXPECT_EQ(line, kProcNetTCPHeader);
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found_header = true;
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continue;
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}
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if (line.empty()) {
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continue;
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}
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// Parse a single entry from /proc/net/tcp.
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//
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// Example entries:
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//
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// clang-format off
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//
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// sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
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// 0: 00000000:006F 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 1968 1 0000000000000000 100 0 0 10 0
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// 1: 0100007F:7533 00000000:0000 0A 00000000:00000000 00:00000000 00000000 120 0 10684 1 0000000000000000 100 0 0 10 0
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// ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^
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// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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//
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// clang-format on
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TCPEntry entry;
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std::vector<std::string> fields =
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StrSplit(line, absl::ByAnyChar(": "), absl::SkipEmpty());
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ASSIGN_OR_RETURN_ERRNO(entry.local_addr, AtoiBase(fields[1], 16));
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ASSIGN_OR_RETURN_ERRNO(entry.local_port, AtoiBase(fields[2], 16));
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ASSIGN_OR_RETURN_ERRNO(entry.remote_addr, AtoiBase(fields[3], 16));
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ASSIGN_OR_RETURN_ERRNO(entry.remote_port, AtoiBase(fields[4], 16));
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ASSIGN_OR_RETURN_ERRNO(entry.state, AtoiBase(fields[5], 16));
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ASSIGN_OR_RETURN_ERRNO(entry.uid, Atoi<uint64_t>(fields[11]));
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ASSIGN_OR_RETURN_ERRNO(entry.inode, Atoi<uint64_t>(fields[13]));
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entries.push_back(entry);
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}
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std::cerr << "<end of /proc/net/tcp>" << std::endl;
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return entries;
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}
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TEST(ProcNetTCP, Exists) {
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const std::string content =
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ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/net/tcp"));
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const std::string header_line = StrCat(kProcNetTCPHeader, "\n");
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if (IsRunningOnGvisor()) {
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// Should be just the header since we don't have any tcp sockets yet.
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EXPECT_EQ(content, header_line);
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} else {
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// On a general linux machine, we could have abitrary sockets on the system,
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// so just check the header.
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EXPECT_THAT(content, ::testing::StartsWith(header_line));
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}
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}
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TEST(ProcNetTCP, EntryUID) {
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auto sockets =
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ASSERT_NO_ERRNO_AND_VALUE(IPv4TCPAcceptBindSocketPair(0).Create());
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std::vector<TCPEntry> entries =
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ASSERT_NO_ERRNO_AND_VALUE(ProcNetTCPEntries());
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TCPEntry e;
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ASSERT_TRUE(FindByLocalAddr(entries, &e, sockets->first_addr()));
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EXPECT_EQ(e.uid, geteuid());
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ASSERT_TRUE(FindByRemoteAddr(entries, &e, sockets->first_addr()));
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EXPECT_EQ(e.uid, geteuid());
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}
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TEST(ProcNetTCP, BindAcceptConnect) {
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auto sockets =
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ASSERT_NO_ERRNO_AND_VALUE(IPv4TCPAcceptBindSocketPair(0).Create());
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std::vector<TCPEntry> entries =
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ASSERT_NO_ERRNO_AND_VALUE(ProcNetTCPEntries());
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// We can only make assertions about the total number of entries if we control
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// the entire "machine".
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if (IsRunningOnGvisor()) {
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EXPECT_EQ(entries.size(), 2);
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}
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EXPECT_TRUE(FindByLocalAddr(entries, nullptr, sockets->first_addr()));
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EXPECT_TRUE(FindByRemoteAddr(entries, nullptr, sockets->first_addr()));
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}
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TEST(ProcNetTCP, InodeReasonable) {
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auto sockets =
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ASSERT_NO_ERRNO_AND_VALUE(IPv4TCPAcceptBindSocketPair(0).Create());
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std::vector<TCPEntry> entries =
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ASSERT_NO_ERRNO_AND_VALUE(ProcNetTCPEntries());
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TCPEntry accepted_entry;
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ASSERT_TRUE(FindByLocalAddr(entries, &accepted_entry, sockets->first_addr()));
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EXPECT_NE(accepted_entry.inode, 0);
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TCPEntry client_entry;
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ASSERT_TRUE(FindByRemoteAddr(entries, &client_entry, sockets->first_addr()));
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EXPECT_NE(client_entry.inode, 0);
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EXPECT_NE(accepted_entry.inode, client_entry.inode);
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}
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TEST(ProcNetTCP, State) {
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std::unique_ptr<FileDescriptor> server =
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ASSERT_NO_ERRNO_AND_VALUE(IPv4TCPUnboundSocket(0).Create());
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auto test_addr = V4Loopback();
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ASSERT_THAT(
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bind(server->get(), reinterpret_cast<struct sockaddr*>(&test_addr.addr),
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test_addr.addr_len),
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SyscallSucceeds());
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struct sockaddr addr;
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socklen_t addrlen = sizeof(struct sockaddr);
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ASSERT_THAT(getsockname(server->get(), &addr, &addrlen), SyscallSucceeds());
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ASSERT_EQ(addrlen, sizeof(struct sockaddr));
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ASSERT_THAT(listen(server->get(), 10), SyscallSucceeds());
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std::vector<TCPEntry> entries =
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ASSERT_NO_ERRNO_AND_VALUE(ProcNetTCPEntries());
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TCPEntry listen_entry;
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ASSERT_TRUE(FindByLocalAddr(entries, &listen_entry, &addr));
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EXPECT_EQ(listen_entry.state, TCP_LISTEN);
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std::unique_ptr<FileDescriptor> client =
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ASSERT_NO_ERRNO_AND_VALUE(IPv4TCPUnboundSocket(0).Create());
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ASSERT_THAT(RetryEINTR(connect)(client->get(), &addr, addrlen),
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SyscallSucceeds());
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entries = ASSERT_NO_ERRNO_AND_VALUE(ProcNetTCPEntries());
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ASSERT_TRUE(FindByLocalAddr(entries, &listen_entry, &addr));
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EXPECT_EQ(listen_entry.state, TCP_LISTEN);
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TCPEntry client_entry;
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ASSERT_TRUE(FindByRemoteAddr(entries, &client_entry, &addr));
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EXPECT_EQ(client_entry.state, TCP_ESTABLISHED);
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FileDescriptor accepted =
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ASSERT_NO_ERRNO_AND_VALUE(Accept(server->get(), nullptr, nullptr));
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const uint32_t accepted_local_host = IPFromInetSockaddr(&addr);
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const uint16_t accepted_local_port = PortFromInetSockaddr(&addr);
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entries = ASSERT_NO_ERRNO_AND_VALUE(ProcNetTCPEntries());
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TCPEntry accepted_entry;
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ASSERT_TRUE(FindBy(entries, &accepted_entry,
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[client_entry, accepted_local_host,
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accepted_local_port](const TCPEntry& e) {
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return e.local_addr == accepted_local_host &&
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e.local_port == accepted_local_port &&
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e.remote_addr == client_entry.local_addr &&
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e.remote_port == client_entry.local_port;
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}));
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EXPECT_EQ(accepted_entry.state, TCP_ESTABLISHED);
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}
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constexpr char kProcNetTCP6Header[] =
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" sl local_address remote_address"
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" st tx_queue rx_queue tr tm->when retrnsmt"
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" uid timeout inode";
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// TCP6Entry represents a single entry from /proc/net/tcp6.
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struct TCP6Entry {
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struct in6_addr local_addr;
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uint16_t local_port;
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struct in6_addr remote_addr;
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uint16_t remote_port;
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uint64_t state;
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uint64_t uid;
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uint64_t inode;
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};
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bool IPv6AddrEqual(const struct in6_addr* a1, const struct in6_addr* a2) {
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return memcmp(a1, a2, sizeof(struct in6_addr)) == 0;
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}
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// Finds the first entry in 'entries' for which 'predicate' returns true.
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// Returns true on match, and sets 'match' to a copy of the matching entry. If
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// 'match' is null, it's ignored.
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bool FindBy6(const std::vector<TCP6Entry>& entries, TCP6Entry* match,
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std::function<bool(const TCP6Entry&)> predicate) {
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for (const TCP6Entry& entry : entries) {
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if (predicate(entry)) {
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if (match != nullptr) {
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*match = entry;
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}
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return true;
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}
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}
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return false;
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}
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const struct in6_addr* IP6FromInetSockaddr(const struct sockaddr* addr) {
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auto* addr6 = reinterpret_cast<const struct sockaddr_in6*>(addr);
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return &addr6->sin6_addr;
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}
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bool FindByLocalAddr6(const std::vector<TCP6Entry>& entries, TCP6Entry* match,
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const struct sockaddr* addr) {
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const struct in6_addr* local = IP6FromInetSockaddr(addr);
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uint16_t port = PortFromInetSockaddr(addr);
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return FindBy6(entries, match, [local, port](const TCP6Entry& e) {
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return (IPv6AddrEqual(&e.local_addr, local) && e.local_port == port);
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});
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}
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bool FindByRemoteAddr6(const std::vector<TCP6Entry>& entries, TCP6Entry* match,
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const struct sockaddr* addr) {
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const struct in6_addr* remote = IP6FromInetSockaddr(addr);
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uint16_t port = PortFromInetSockaddr(addr);
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return FindBy6(entries, match, [remote, port](const TCP6Entry& e) {
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return (IPv6AddrEqual(&e.remote_addr, remote) && e.remote_port == port);
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});
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}
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void ReadIPv6Address(std::string s, struct in6_addr* addr) {
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uint32_t a0, a1, a2, a3;
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const char* fmt = "%08X%08X%08X%08X";
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EXPECT_EQ(sscanf(s.c_str(), fmt, &a0, &a1, &a2, &a3), 4);
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uint8_t* b = addr->s6_addr;
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*((uint32_t*)&b[0]) = a0;
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*((uint32_t*)&b[4]) = a1;
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*((uint32_t*)&b[8]) = a2;
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*((uint32_t*)&b[12]) = a3;
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}
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// Returns a parsed representation of /proc/net/tcp6 entries.
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PosixErrorOr<std::vector<TCP6Entry>> ProcNetTCP6Entries() {
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std::string content;
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RETURN_IF_ERRNO(GetContents("/proc/net/tcp6", &content));
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bool found_header = false;
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std::vector<TCP6Entry> entries;
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std::vector<std::string> lines = StrSplit(content, '\n');
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std::cerr << "<contents of /proc/net/tcp6>" << std::endl;
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for (const std::string& line : lines) {
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std::cerr << line << std::endl;
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if (!found_header) {
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EXPECT_EQ(line, kProcNetTCP6Header);
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found_header = true;
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continue;
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}
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if (line.empty()) {
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continue;
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}
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// Parse a single entry from /proc/net/tcp6.
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//
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// Example entries:
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//
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// clang-format off
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//
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// sl local_address remote_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
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// 0: 00000000000000000000000000000000:1F90 00000000000000000000000000000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 876340 1 ffff8803da9c9380 100 0 0 10 0
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// 1: 00000000000000000000000000000000:C350 00000000000000000000000000000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 876987 1 ffff8803ec408000 100 0 0 10 0
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// ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^
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// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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//
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// clang-format on
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TCP6Entry entry;
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std::vector<std::string> fields =
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StrSplit(line, absl::ByAnyChar(": "), absl::SkipEmpty());
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ReadIPv6Address(fields[1], &entry.local_addr);
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ASSIGN_OR_RETURN_ERRNO(entry.local_port, AtoiBase(fields[2], 16));
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ReadIPv6Address(fields[3], &entry.remote_addr);
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ASSIGN_OR_RETURN_ERRNO(entry.remote_port, AtoiBase(fields[4], 16));
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ASSIGN_OR_RETURN_ERRNO(entry.state, AtoiBase(fields[5], 16));
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ASSIGN_OR_RETURN_ERRNO(entry.uid, Atoi<uint64_t>(fields[11]));
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ASSIGN_OR_RETURN_ERRNO(entry.inode, Atoi<uint64_t>(fields[13]));
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entries.push_back(entry);
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}
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std::cerr << "<end of /proc/net/tcp6>" << std::endl;
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return entries;
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}
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TEST(ProcNetTCP6, Exists) {
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const std::string content =
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ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/net/tcp6"));
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const std::string header_line = StrCat(kProcNetTCP6Header, "\n");
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if (IsRunningOnGvisor()) {
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// Should be just the header since we don't have any tcp sockets yet.
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EXPECT_EQ(content, header_line);
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} else {
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// On a general linux machine, we could have abitrary sockets on the system,
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// so just check the header.
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EXPECT_THAT(content, ::testing::StartsWith(header_line));
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}
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}
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TEST(ProcNetTCP6, EntryUID) {
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auto sockets =
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ASSERT_NO_ERRNO_AND_VALUE(IPv6TCPAcceptBindSocketPair(0).Create());
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std::vector<TCP6Entry> entries =
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ASSERT_NO_ERRNO_AND_VALUE(ProcNetTCP6Entries());
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TCP6Entry e;
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ASSERT_TRUE(FindByLocalAddr6(entries, &e, sockets->first_addr()));
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EXPECT_EQ(e.uid, geteuid());
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ASSERT_TRUE(FindByRemoteAddr6(entries, &e, sockets->first_addr()));
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EXPECT_EQ(e.uid, geteuid());
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}
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TEST(ProcNetTCP6, BindAcceptConnect) {
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auto sockets =
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ASSERT_NO_ERRNO_AND_VALUE(IPv6TCPAcceptBindSocketPair(0).Create());
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std::vector<TCP6Entry> entries =
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ASSERT_NO_ERRNO_AND_VALUE(ProcNetTCP6Entries());
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// We can only make assertions about the total number of entries if we control
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// the entire "machine".
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if (IsRunningOnGvisor()) {
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EXPECT_EQ(entries.size(), 2);
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}
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EXPECT_TRUE(FindByLocalAddr6(entries, nullptr, sockets->first_addr()));
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EXPECT_TRUE(FindByRemoteAddr6(entries, nullptr, sockets->first_addr()));
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}
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TEST(ProcNetTCP6, InodeReasonable) {
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auto sockets =
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ASSERT_NO_ERRNO_AND_VALUE(IPv6TCPAcceptBindSocketPair(0).Create());
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std::vector<TCP6Entry> entries =
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ASSERT_NO_ERRNO_AND_VALUE(ProcNetTCP6Entries());
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TCP6Entry accepted_entry;
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ASSERT_TRUE(
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FindByLocalAddr6(entries, &accepted_entry, sockets->first_addr()));
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EXPECT_NE(accepted_entry.inode, 0);
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TCP6Entry client_entry;
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ASSERT_TRUE(FindByRemoteAddr6(entries, &client_entry, sockets->first_addr()));
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EXPECT_NE(client_entry.inode, 0);
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EXPECT_NE(accepted_entry.inode, client_entry.inode);
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}
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TEST(ProcNetTCP6, State) {
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std::unique_ptr<FileDescriptor> server =
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ASSERT_NO_ERRNO_AND_VALUE(IPv6TCPUnboundSocket(0).Create());
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auto test_addr = V6Loopback();
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ASSERT_THAT(
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bind(server->get(), reinterpret_cast<struct sockaddr*>(&test_addr.addr),
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test_addr.addr_len),
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SyscallSucceeds());
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struct sockaddr_in6 addr6;
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socklen_t addrlen = sizeof(struct sockaddr_in6);
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auto* addr = reinterpret_cast<struct sockaddr*>(&addr6);
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ASSERT_THAT(getsockname(server->get(), addr, &addrlen), SyscallSucceeds());
|
|
ASSERT_EQ(addrlen, sizeof(struct sockaddr_in6));
|
|
|
|
ASSERT_THAT(listen(server->get(), 10), SyscallSucceeds());
|
|
std::vector<TCP6Entry> entries =
|
|
ASSERT_NO_ERRNO_AND_VALUE(ProcNetTCP6Entries());
|
|
TCP6Entry listen_entry;
|
|
|
|
ASSERT_TRUE(FindByLocalAddr6(entries, &listen_entry, addr));
|
|
EXPECT_EQ(listen_entry.state, TCP_LISTEN);
|
|
|
|
std::unique_ptr<FileDescriptor> client =
|
|
ASSERT_NO_ERRNO_AND_VALUE(IPv6TCPUnboundSocket(0).Create());
|
|
ASSERT_THAT(RetryEINTR(connect)(client->get(), addr, addrlen),
|
|
SyscallSucceeds());
|
|
entries = ASSERT_NO_ERRNO_AND_VALUE(ProcNetTCP6Entries());
|
|
ASSERT_TRUE(FindByLocalAddr6(entries, &listen_entry, addr));
|
|
EXPECT_EQ(listen_entry.state, TCP_LISTEN);
|
|
TCP6Entry client_entry;
|
|
ASSERT_TRUE(FindByRemoteAddr6(entries, &client_entry, addr));
|
|
EXPECT_EQ(client_entry.state, TCP_ESTABLISHED);
|
|
|
|
FileDescriptor accepted =
|
|
ASSERT_NO_ERRNO_AND_VALUE(Accept(server->get(), nullptr, nullptr));
|
|
|
|
const struct in6_addr* local = IP6FromInetSockaddr(addr);
|
|
const uint16_t accepted_local_port = PortFromInetSockaddr(addr);
|
|
|
|
entries = ASSERT_NO_ERRNO_AND_VALUE(ProcNetTCP6Entries());
|
|
TCP6Entry accepted_entry;
|
|
ASSERT_TRUE(FindBy6(
|
|
entries, &accepted_entry,
|
|
[client_entry, local, accepted_local_port](const TCP6Entry& e) {
|
|
return IPv6AddrEqual(&e.local_addr, local) &&
|
|
e.local_port == accepted_local_port &&
|
|
IPv6AddrEqual(&e.remote_addr, &client_entry.local_addr) &&
|
|
e.remote_port == client_entry.local_port;
|
|
}));
|
|
EXPECT_EQ(accepted_entry.state, TCP_ESTABLISHED);
|
|
}
|
|
|
|
} // namespace
|
|
} // namespace testing
|
|
} // namespace gvisor
|