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|
// Copyright 2018 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 "test/syscalls/linux/socket_test_util.h"
#include <arpa/inet.h>
#include <netinet/in.h>
#include <poll.h>
#include <sys/socket.h>
#include <memory>
#include "gtest/gtest.h"
#include "absl/memory/memory.h"
#include "absl/strings/str_cat.h"
#include "absl/time/clock.h"
#include "absl/types/optional.h"
#include "test/util/file_descriptor.h"
#include "test/util/posix_error.h"
#include "test/util/temp_path.h"
#include "test/util/thread_util.h"
namespace gvisor {
namespace testing {
Creator<SocketPair> SyscallSocketPairCreator(int domain, int type,
int protocol) {
return [=]() -> PosixErrorOr<std::unique_ptr<FDSocketPair>> {
int pair[2];
RETURN_ERROR_IF_SYSCALL_FAIL(socketpair(domain, type, protocol, pair));
MaybeSave(); // Save on successful creation.
return absl::make_unique<FDSocketPair>(pair[0], pair[1]);
};
}
Creator<FileDescriptor> SyscallSocketCreator(int domain, int type,
int protocol) {
return [=]() -> PosixErrorOr<std::unique_ptr<FileDescriptor>> {
int fd = 0;
RETURN_ERROR_IF_SYSCALL_FAIL(fd = socket(domain, type, protocol));
MaybeSave(); // Save on successful creation.
return absl::make_unique<FileDescriptor>(fd);
};
}
PosixErrorOr<struct sockaddr_un> UniqueUnixAddr(bool abstract, int domain) {
struct sockaddr_un addr = {};
std::string path = NewTempAbsPathInDir("/tmp");
if (path.size() >= sizeof(addr.sun_path)) {
return PosixError(EINVAL,
"Unable to generate a temp path of appropriate length");
}
if (abstract) {
// Indicate that the path is in the abstract namespace.
path[0] = 0;
}
memcpy(addr.sun_path, path.c_str(), path.length());
addr.sun_family = domain;
return addr;
}
Creator<SocketPair> AcceptBindSocketPairCreator(bool abstract, int domain,
int type, int protocol) {
return [=]() -> PosixErrorOr<std::unique_ptr<AddrFDSocketPair>> {
ASSIGN_OR_RETURN_ERRNO(struct sockaddr_un bind_addr,
UniqueUnixAddr(abstract, domain));
ASSIGN_OR_RETURN_ERRNO(struct sockaddr_un extra_addr,
UniqueUnixAddr(abstract, domain));
int bound;
RETURN_ERROR_IF_SYSCALL_FAIL(bound = socket(domain, type, protocol));
MaybeSave(); // Successful socket creation.
RETURN_ERROR_IF_SYSCALL_FAIL(
bind(bound, AsSockAddr(&bind_addr), sizeof(bind_addr)));
MaybeSave(); // Successful bind.
RETURN_ERROR_IF_SYSCALL_FAIL(listen(bound, /* backlog = */ 5));
MaybeSave(); // Successful listen.
int connected;
RETURN_ERROR_IF_SYSCALL_FAIL(connected = socket(domain, type, protocol));
MaybeSave(); // Successful socket creation.
RETURN_ERROR_IF_SYSCALL_FAIL(
connect(connected, AsSockAddr(&bind_addr), sizeof(bind_addr)));
MaybeSave(); // Successful connect.
int accepted;
RETURN_ERROR_IF_SYSCALL_FAIL(
accepted = accept4(bound, nullptr, nullptr,
type & (SOCK_NONBLOCK | SOCK_CLOEXEC)));
MaybeSave(); // Successful connect.
// Cleanup no longer needed resources.
RETURN_ERROR_IF_SYSCALL_FAIL(close(bound));
MaybeSave(); // Dropped original socket.
// Only unlink if path is not in abstract namespace.
if (bind_addr.sun_path[0] != 0) {
RETURN_ERROR_IF_SYSCALL_FAIL(unlink(bind_addr.sun_path));
MaybeSave(); // Unlinked path.
}
// accepted is before connected to destruct connected before accepted.
// Destructors for nonstatic member objects are called in the reverse order
// in which they appear in the class declaration.
return absl::make_unique<AddrFDSocketPair>(accepted, connected, bind_addr,
extra_addr);
};
}
Creator<SocketPair> FilesystemAcceptBindSocketPairCreator(int domain, int type,
int protocol) {
return AcceptBindSocketPairCreator(/* abstract= */ false, domain, type,
protocol);
}
Creator<SocketPair> AbstractAcceptBindSocketPairCreator(int domain, int type,
int protocol) {
return AcceptBindSocketPairCreator(/* abstract= */ true, domain, type,
protocol);
}
Creator<SocketPair> BidirectionalBindSocketPairCreator(bool abstract,
int domain, int type,
int protocol) {
return [=]() -> PosixErrorOr<std::unique_ptr<FDSocketPair>> {
ASSIGN_OR_RETURN_ERRNO(struct sockaddr_un addr1,
UniqueUnixAddr(abstract, domain));
ASSIGN_OR_RETURN_ERRNO(struct sockaddr_un addr2,
UniqueUnixAddr(abstract, domain));
int sock1;
RETURN_ERROR_IF_SYSCALL_FAIL(sock1 = socket(domain, type, protocol));
MaybeSave(); // Successful socket creation.
RETURN_ERROR_IF_SYSCALL_FAIL(
bind(sock1, AsSockAddr(&addr1), sizeof(addr1)));
MaybeSave(); // Successful bind.
int sock2;
RETURN_ERROR_IF_SYSCALL_FAIL(sock2 = socket(domain, type, protocol));
MaybeSave(); // Successful socket creation.
RETURN_ERROR_IF_SYSCALL_FAIL(
bind(sock2, AsSockAddr(&addr2), sizeof(addr2)));
MaybeSave(); // Successful bind.
RETURN_ERROR_IF_SYSCALL_FAIL(
connect(sock1, AsSockAddr(&addr2), sizeof(addr2)));
MaybeSave(); // Successful connect.
RETURN_ERROR_IF_SYSCALL_FAIL(
connect(sock2, AsSockAddr(&addr1), sizeof(addr1)));
MaybeSave(); // Successful connect.
// Cleanup no longer needed resources.
// Only unlink if path is not in abstract namespace.
if (addr1.sun_path[0] != 0) {
RETURN_ERROR_IF_SYSCALL_FAIL(unlink(addr1.sun_path));
MaybeSave(); // Successful unlink.
}
// Only unlink if path is not in abstract namespace.
if (addr2.sun_path[0] != 0) {
RETURN_ERROR_IF_SYSCALL_FAIL(unlink(addr2.sun_path));
MaybeSave(); // Successful unlink.
}
return absl::make_unique<FDSocketPair>(sock1, sock2);
};
}
Creator<SocketPair> FilesystemBidirectionalBindSocketPairCreator(int domain,
int type,
int protocol) {
return BidirectionalBindSocketPairCreator(/* abstract= */ false, domain, type,
protocol);
}
Creator<SocketPair> AbstractBidirectionalBindSocketPairCreator(int domain,
int type,
int protocol) {
return BidirectionalBindSocketPairCreator(/* abstract= */ true, domain, type,
protocol);
}
Creator<SocketPair> SocketpairGoferSocketPairCreator(int domain, int type,
int protocol) {
return [=]() -> PosixErrorOr<std::unique_ptr<FDSocketPair>> {
struct sockaddr_un addr = {};
constexpr char kSocketGoferPath[] = "/socket";
memcpy(addr.sun_path, kSocketGoferPath, sizeof(kSocketGoferPath));
addr.sun_family = domain;
int sock1;
RETURN_ERROR_IF_SYSCALL_FAIL(sock1 = socket(domain, type, protocol));
MaybeSave(); // Successful socket creation.
RETURN_ERROR_IF_SYSCALL_FAIL(
connect(sock1, AsSockAddr(&addr), sizeof(addr)));
MaybeSave(); // Successful connect.
int sock2;
RETURN_ERROR_IF_SYSCALL_FAIL(sock2 = socket(domain, type, protocol));
MaybeSave(); // Successful socket creation.
RETURN_ERROR_IF_SYSCALL_FAIL(
connect(sock2, AsSockAddr(&addr), sizeof(addr)));
MaybeSave(); // Successful connect.
// Make and close another socketpair to ensure that the duped ends of the
// first socketpair get closed.
//
// The problem is that there is no way to atomically send and close an FD.
// The closest that we can do is send and then immediately close the FD,
// which is what we do in the gofer. The gofer won't respond to another
// request until the reply is sent and the FD is closed, so forcing the
// gofer to handle another request will ensure that this has happened.
for (int i = 0; i < 2; i++) {
int sock;
RETURN_ERROR_IF_SYSCALL_FAIL(sock = socket(domain, type, protocol));
RETURN_ERROR_IF_SYSCALL_FAIL(
connect(sock, AsSockAddr(&addr), sizeof(addr)));
RETURN_ERROR_IF_SYSCALL_FAIL(close(sock));
}
return absl::make_unique<FDSocketPair>(sock1, sock2);
};
}
Creator<SocketPair> SocketpairGoferFileSocketPairCreator(int flags) {
return [=]() -> PosixErrorOr<std::unique_ptr<FDSocketPair>> {
constexpr char kSocketGoferPath[] = "/socket";
int sock1;
RETURN_ERROR_IF_SYSCALL_FAIL(sock1 =
open(kSocketGoferPath, O_RDWR | flags));
MaybeSave(); // Successful socket creation.
int sock2;
RETURN_ERROR_IF_SYSCALL_FAIL(sock2 =
open(kSocketGoferPath, O_RDWR | flags));
MaybeSave(); // Successful socket creation.
return absl::make_unique<FDSocketPair>(sock1, sock2);
};
}
Creator<SocketPair> UnboundSocketPairCreator(bool abstract, int domain,
int type, int protocol) {
return [=]() -> PosixErrorOr<std::unique_ptr<AddrFDSocketPair>> {
ASSIGN_OR_RETURN_ERRNO(struct sockaddr_un addr1,
UniqueUnixAddr(abstract, domain));
ASSIGN_OR_RETURN_ERRNO(struct sockaddr_un addr2,
UniqueUnixAddr(abstract, domain));
int sock1;
RETURN_ERROR_IF_SYSCALL_FAIL(sock1 = socket(domain, type, protocol));
MaybeSave(); // Successful socket creation.
int sock2;
RETURN_ERROR_IF_SYSCALL_FAIL(sock2 = socket(domain, type, protocol));
MaybeSave(); // Successful socket creation.
return absl::make_unique<AddrFDSocketPair>(sock1, sock2, addr1, addr2);
};
}
Creator<SocketPair> FilesystemUnboundSocketPairCreator(int domain, int type,
int protocol) {
return UnboundSocketPairCreator(/* abstract= */ false, domain, type,
protocol);
}
Creator<SocketPair> AbstractUnboundSocketPairCreator(int domain, int type,
int protocol) {
return UnboundSocketPairCreator(/* abstract= */ true, domain, type, protocol);
}
void LocalhostAddr(struct sockaddr_in* addr, bool dual_stack) {
addr->sin_family = AF_INET;
addr->sin_port = htons(0);
inet_pton(AF_INET, "127.0.0.1",
reinterpret_cast<void*>(&addr->sin_addr.s_addr));
}
void LocalhostAddr(struct sockaddr_in6* addr, bool dual_stack) {
addr->sin6_family = AF_INET6;
addr->sin6_port = htons(0);
if (dual_stack) {
inet_pton(AF_INET6, "::ffff:127.0.0.1",
reinterpret_cast<void*>(&addr->sin6_addr.s6_addr));
} else {
inet_pton(AF_INET6, "::1",
reinterpret_cast<void*>(&addr->sin6_addr.s6_addr));
}
addr->sin6_scope_id = 0;
}
template <typename T>
PosixErrorOr<T> BindIP(int fd, bool dual_stack) {
T addr = {};
LocalhostAddr(&addr, dual_stack);
RETURN_ERROR_IF_SYSCALL_FAIL(bind(fd, AsSockAddr(&addr), sizeof(addr)));
socklen_t addrlen = sizeof(addr);
RETURN_ERROR_IF_SYSCALL_FAIL(getsockname(fd, AsSockAddr(&addr), &addrlen));
return addr;
}
template <typename T>
PosixErrorOr<T> TCPBindAndListen(int fd, bool dual_stack) {
ASSIGN_OR_RETURN_ERRNO(T addr, BindIP<T>(fd, dual_stack));
RETURN_ERROR_IF_SYSCALL_FAIL(listen(fd, /* backlog = */ 5));
return addr;
}
template <typename T>
PosixErrorOr<std::unique_ptr<AddrFDSocketPair>>
CreateTCPConnectAcceptSocketPair(int bound, int connected, int type,
bool dual_stack, T bind_addr) {
int connect_result = 0;
RETURN_ERROR_IF_SYSCALL_FAIL(
(connect_result = RetryEINTR(connect)(connected, AsSockAddr(&bind_addr),
sizeof(bind_addr))) == -1 &&
errno == EINPROGRESS
? 0
: connect_result);
MaybeSave(); // Successful connect.
if (connect_result == -1) {
struct pollfd connect_poll = {connected, POLLOUT | POLLERR | POLLHUP, 0};
RETURN_ERROR_IF_SYSCALL_FAIL(RetryEINTR(poll)(&connect_poll, 1, 0));
int error = 0;
socklen_t errorlen = sizeof(error);
RETURN_ERROR_IF_SYSCALL_FAIL(
getsockopt(connected, SOL_SOCKET, SO_ERROR, &error, &errorlen));
errno = error;
RETURN_ERROR_IF_SYSCALL_FAIL(
/* connect */ error == 0 ? 0 : -1);
}
int accepted = -1;
struct pollfd accept_poll = {bound, POLLIN, 0};
while (accepted == -1) {
RETURN_ERROR_IF_SYSCALL_FAIL(RetryEINTR(poll)(&accept_poll, 1, 0));
RETURN_ERROR_IF_SYSCALL_FAIL(
(accepted = RetryEINTR(accept4)(
bound, nullptr, nullptr, type & (SOCK_NONBLOCK | SOCK_CLOEXEC))) ==
-1 &&
errno == EAGAIN
? 0
: accepted);
}
MaybeSave(); // Successful accept.
T extra_addr = {};
LocalhostAddr(&extra_addr, dual_stack);
return absl::make_unique<AddrFDSocketPair>(connected, accepted, bind_addr,
extra_addr);
}
template <typename T>
PosixErrorOr<std::unique_ptr<AddrFDSocketPair>> CreateTCPAcceptBindSocketPair(
int bound, int connected, int type, bool dual_stack) {
ASSIGN_OR_RETURN_ERRNO(T bind_addr, TCPBindAndListen<T>(bound, dual_stack));
auto result = CreateTCPConnectAcceptSocketPair(bound, connected, type,
dual_stack, bind_addr);
// Cleanup no longer needed resources.
RETURN_ERROR_IF_SYSCALL_FAIL(close(bound));
MaybeSave(); // Successful close.
return result;
}
Creator<SocketPair> TCPAcceptBindSocketPairCreator(int domain, int type,
int protocol,
bool dual_stack) {
return [=]() -> PosixErrorOr<std::unique_ptr<AddrFDSocketPair>> {
int bound;
RETURN_ERROR_IF_SYSCALL_FAIL(bound = socket(domain, type, protocol));
MaybeSave(); // Successful socket creation.
int connected;
RETURN_ERROR_IF_SYSCALL_FAIL(connected = socket(domain, type, protocol));
MaybeSave(); // Successful socket creation.
if (domain == AF_INET) {
return CreateTCPAcceptBindSocketPair<sockaddr_in>(bound, connected, type,
dual_stack);
}
return CreateTCPAcceptBindSocketPair<sockaddr_in6>(bound, connected, type,
dual_stack);
};
}
Creator<SocketPair> TCPAcceptBindPersistentListenerSocketPairCreator(
int domain, int type, int protocol, bool dual_stack) {
// These are lazily initialized below, on the first call to the returned
// lambda. These values are private to each returned lambda, but shared across
// invocations of a specific lambda.
//
// The sharing allows pairs created with the same parameters to share a
// listener. This prevents future connects from failing if the connecting
// socket selects a port which had previously been used by a listening socket
// that still has some connections in TIME-WAIT.
//
// The lazy initialization is to avoid creating sockets during parameter
// enumeration. This is important because parameters are enumerated during the
// build process where networking may not be available.
auto listener = std::make_shared<absl::optional<int>>(absl::optional<int>());
auto addr4 = std::make_shared<absl::optional<sockaddr_in>>(
absl::optional<sockaddr_in>());
auto addr6 = std::make_shared<absl::optional<sockaddr_in6>>(
absl::optional<sockaddr_in6>());
return [=]() -> PosixErrorOr<std::unique_ptr<AddrFDSocketPair>> {
int connected;
RETURN_ERROR_IF_SYSCALL_FAIL(connected = socket(domain, type, protocol));
MaybeSave(); // Successful socket creation.
// Share the listener across invocations.
if (!listener->has_value()) {
int fd = socket(domain, type, protocol);
if (fd < 0) {
return PosixError(errno, absl::StrCat("socket(", domain, ", ", type,
", ", protocol, ")"));
}
listener->emplace(fd);
MaybeSave(); // Successful socket creation.
}
// Bind the listener once, but create a new connect/accept pair each
// time.
if (domain == AF_INET) {
if (!addr4->has_value()) {
addr4->emplace(
TCPBindAndListen<sockaddr_in>(listener->value(), dual_stack)
.ValueOrDie());
}
return CreateTCPConnectAcceptSocketPair(listener->value(), connected,
type, dual_stack, addr4->value());
}
if (!addr6->has_value()) {
addr6->emplace(
TCPBindAndListen<sockaddr_in6>(listener->value(), dual_stack)
.ValueOrDie());
}
return CreateTCPConnectAcceptSocketPair(listener->value(), connected, type,
dual_stack, addr6->value());
};
}
template <typename T>
PosixErrorOr<std::unique_ptr<AddrFDSocketPair>> CreateUDPBoundSocketPair(
int sock1, int sock2, int type, bool dual_stack) {
ASSIGN_OR_RETURN_ERRNO(T addr1, BindIP<T>(sock1, dual_stack));
ASSIGN_OR_RETURN_ERRNO(T addr2, BindIP<T>(sock2, dual_stack));
return absl::make_unique<AddrFDSocketPair>(sock1, sock2, addr1, addr2);
}
template <typename T>
PosixErrorOr<std::unique_ptr<AddrFDSocketPair>>
CreateUDPBidirectionalBindSocketPair(int sock1, int sock2, int type,
bool dual_stack) {
ASSIGN_OR_RETURN_ERRNO(
auto socks, CreateUDPBoundSocketPair<T>(sock1, sock2, type, dual_stack));
// Connect sock1 to sock2.
RETURN_ERROR_IF_SYSCALL_FAIL(connect(socks->first_fd(), socks->second_addr(),
socks->second_addr_size()));
MaybeSave(); // Successful connection.
// Connect sock2 to sock1.
RETURN_ERROR_IF_SYSCALL_FAIL(connect(socks->second_fd(), socks->first_addr(),
socks->first_addr_size()));
MaybeSave(); // Successful connection.
return socks;
}
Creator<SocketPair> UDPBidirectionalBindSocketPairCreator(int domain, int type,
int protocol,
bool dual_stack) {
return [=]() -> PosixErrorOr<std::unique_ptr<AddrFDSocketPair>> {
int sock1;
RETURN_ERROR_IF_SYSCALL_FAIL(sock1 = socket(domain, type, protocol));
MaybeSave(); // Successful socket creation.
int sock2;
RETURN_ERROR_IF_SYSCALL_FAIL(sock2 = socket(domain, type, protocol));
MaybeSave(); // Successful socket creation.
if (domain == AF_INET) {
return CreateUDPBidirectionalBindSocketPair<sockaddr_in>(
sock1, sock2, type, dual_stack);
}
return CreateUDPBidirectionalBindSocketPair<sockaddr_in6>(sock1, sock2,
type, dual_stack);
};
}
Creator<SocketPair> UDPUnboundSocketPairCreator(int domain, int type,
int protocol, bool dual_stack) {
return [=]() -> PosixErrorOr<std::unique_ptr<FDSocketPair>> {
int sock1;
RETURN_ERROR_IF_SYSCALL_FAIL(sock1 = socket(domain, type, protocol));
MaybeSave(); // Successful socket creation.
int sock2;
RETURN_ERROR_IF_SYSCALL_FAIL(sock2 = socket(domain, type, protocol));
MaybeSave(); // Successful socket creation.
return absl::make_unique<FDSocketPair>(sock1, sock2);
};
}
SocketPairKind Reversed(SocketPairKind const& base) {
auto const& creator = base.creator;
return SocketPairKind{
absl::StrCat("reversed ", base.description), base.domain, base.type,
base.protocol,
[creator]() -> PosixErrorOr<std::unique_ptr<ReversedSocketPair>> {
ASSIGN_OR_RETURN_ERRNO(auto creator_value, creator());
return absl::make_unique<ReversedSocketPair>(std::move(creator_value));
}};
}
Creator<FileDescriptor> UnboundSocketCreator(int domain, int type,
int protocol) {
return [=]() -> PosixErrorOr<std::unique_ptr<FileDescriptor>> {
int sock;
RETURN_ERROR_IF_SYSCALL_FAIL(sock = socket(domain, type, protocol));
MaybeSave(); // Successful socket creation.
return absl::make_unique<FileDescriptor>(sock);
};
}
std::vector<SocketPairKind> IncludeReversals(std::vector<SocketPairKind> vec) {
return ApplyVecToVec<SocketPairKind>(std::vector<Middleware>{NoOp, Reversed},
vec);
}
SocketPairKind NoOp(SocketPairKind const& base) { return base; }
void TransferTest(int fd1, int fd2) {
char buf1[20];
RandomizeBuffer(buf1, sizeof(buf1));
ASSERT_THAT(WriteFd(fd1, buf1, sizeof(buf1)),
SyscallSucceedsWithValue(sizeof(buf1)));
char buf2[20];
ASSERT_THAT(ReadFd(fd2, buf2, sizeof(buf2)),
SyscallSucceedsWithValue(sizeof(buf2)));
EXPECT_EQ(0, memcmp(buf1, buf2, sizeof(buf1)));
RandomizeBuffer(buf1, sizeof(buf1));
ASSERT_THAT(WriteFd(fd2, buf1, sizeof(buf1)),
SyscallSucceedsWithValue(sizeof(buf1)));
ASSERT_THAT(ReadFd(fd1, buf2, sizeof(buf2)),
SyscallSucceedsWithValue(sizeof(buf2)));
EXPECT_EQ(0, memcmp(buf1, buf2, sizeof(buf1)));
}
// Initializes the given buffer with random data.
void RandomizeBuffer(char* ptr, size_t len) {
uint32_t seed = time(nullptr);
for (size_t i = 0; i < len; ++i) {
ptr[i] = static_cast<char>(rand_r(&seed));
}
}
size_t CalculateUnixSockAddrLen(const char* sun_path) {
// Abstract addresses always return the full length.
if (sun_path[0] == 0) {
return sizeof(sockaddr_un);
}
// Filesystem addresses use the address length plus the 2 byte sun_family
// and null terminator.
return strlen(sun_path) + 3;
}
struct sockaddr_storage AddrFDSocketPair::to_storage(const sockaddr_un& addr) {
struct sockaddr_storage addr_storage = {};
memcpy(&addr_storage, &addr, sizeof(addr));
return addr_storage;
}
struct sockaddr_storage AddrFDSocketPair::to_storage(const sockaddr_in& addr) {
struct sockaddr_storage addr_storage = {};
memcpy(&addr_storage, &addr, sizeof(addr));
return addr_storage;
}
struct sockaddr_storage AddrFDSocketPair::to_storage(const sockaddr_in6& addr) {
struct sockaddr_storage addr_storage = {};
memcpy(&addr_storage, &addr, sizeof(addr));
return addr_storage;
}
SocketKind SimpleSocket(int fam, int type, int proto) {
return SocketKind{
absl::StrCat("Family ", fam, ", type ", type, ", proto ", proto), fam,
type, proto, SyscallSocketCreator(fam, type, proto)};
}
ssize_t SendLargeSendMsg(const std::unique_ptr<SocketPair>& sockets,
size_t size, bool reader) {
const int rfd = sockets->second_fd();
ScopedThread t([rfd, size, reader] {
if (!reader) {
return;
}
// Potentially too many syscalls in the loop.
const DisableSave ds;
std::vector<char> buf(size);
size_t total = 0;
while (total < size) {
int ret = read(rfd, buf.data(), buf.size());
if (ret == -1 && errno == EAGAIN) {
continue;
}
if (ret > 0) {
total += ret;
}
// Assert to return on first failure.
ASSERT_THAT(ret, SyscallSucceeds());
}
});
std::vector<char> buf(size);
struct iovec iov = {};
iov.iov_base = buf.data();
iov.iov_len = buf.size();
struct msghdr msg = {};
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
return RetryEINTR(sendmsg)(sockets->first_fd(), &msg, 0);
}
namespace internal {
PosixErrorOr<int> TryPortAvailable(int port, AddressFamily family,
SocketType type, bool reuse_addr) {
if (port < 0) {
return PosixError(EINVAL, "Invalid port");
}
// Both Ipv6 and Dualstack are AF_INET6.
int sock_fam = (family == AddressFamily::kIpv4 ? AF_INET : AF_INET6);
int sock_type = (type == SocketType::kTcp ? SOCK_STREAM : SOCK_DGRAM);
ASSIGN_OR_RETURN_ERRNO(auto fd, Socket(sock_fam, sock_type, 0));
if (reuse_addr) {
int one = 1;
RETURN_ERROR_IF_SYSCALL_FAIL(
setsockopt(fd.get(), SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)));
}
// Try to bind.
sockaddr_storage storage = {};
int storage_size = 0;
if (family == AddressFamily::kIpv4) {
sockaddr_in* addr = reinterpret_cast<sockaddr_in*>(&storage);
storage_size = sizeof(*addr);
addr->sin_family = AF_INET;
addr->sin_port = htons(port);
addr->sin_addr.s_addr = htonl(INADDR_ANY);
} else {
sockaddr_in6* addr = reinterpret_cast<sockaddr_in6*>(&storage);
storage_size = sizeof(*addr);
addr->sin6_family = AF_INET6;
addr->sin6_port = htons(port);
if (family == AddressFamily::kDualStack) {
inet_pton(AF_INET6, "::ffff:0.0.0.0",
reinterpret_cast<void*>(&addr->sin6_addr.s6_addr));
} else {
addr->sin6_addr = in6addr_any;
}
}
RETURN_ERROR_IF_SYSCALL_FAIL(
bind(fd.get(), AsSockAddr(&storage), storage_size));
// If the user specified 0 as the port, we will return the port that the
// kernel gave us, otherwise we will validate that this socket bound to the
// requested port.
sockaddr_storage bound_storage = {};
socklen_t bound_storage_size = sizeof(bound_storage);
RETURN_ERROR_IF_SYSCALL_FAIL(
getsockname(fd.get(), AsSockAddr(&bound_storage), &bound_storage_size));
int available_port = -1;
if (bound_storage.ss_family == AF_INET) {
sockaddr_in* addr = reinterpret_cast<sockaddr_in*>(&bound_storage);
available_port = ntohs(addr->sin_port);
} else if (bound_storage.ss_family == AF_INET6) {
sockaddr_in6* addr = reinterpret_cast<sockaddr_in6*>(&bound_storage);
available_port = ntohs(addr->sin6_port);
} else {
return PosixError(EPROTOTYPE, "Getsockname returned invalid family");
}
// If we requested a specific port make sure our bound port is that port.
if (port != 0 && available_port != port) {
return PosixError(EINVAL,
absl::StrCat("Bound port ", available_port,
" was not equal to requested port ", port));
}
// If we're trying to do a TCP socket, let's also try to listen.
if (type == SocketType::kTcp) {
RETURN_ERROR_IF_SYSCALL_FAIL(listen(fd.get(), 1));
}
return available_port;
}
} // namespace internal
PosixErrorOr<int> SendMsg(int sock, msghdr* msg, char buf[], int buf_size) {
struct iovec iov;
iov.iov_base = buf;
iov.iov_len = buf_size;
msg->msg_iov = &iov;
msg->msg_iovlen = 1;
int ret;
RETURN_ERROR_IF_SYSCALL_FAIL(ret = RetryEINTR(sendmsg)(sock, msg, 0));
return ret;
}
PosixErrorOr<int> RecvTimeout(int sock, char buf[], int buf_size, int timeout) {
fd_set rfd;
struct timeval to = {.tv_sec = timeout, .tv_usec = 0};
FD_ZERO(&rfd);
FD_SET(sock, &rfd);
int ret;
RETURN_ERROR_IF_SYSCALL_FAIL(ret = select(1, &rfd, NULL, NULL, &to));
RETURN_ERROR_IF_SYSCALL_FAIL(
ret = RetryEINTR(recv)(sock, buf, buf_size, MSG_DONTWAIT));
return ret;
}
PosixErrorOr<int> RecvMsgTimeout(int sock, struct msghdr* msg, int timeout) {
fd_set rfd;
struct timeval to = {.tv_sec = timeout, .tv_usec = 0};
FD_ZERO(&rfd);
FD_SET(sock, &rfd);
int ret;
RETURN_ERROR_IF_SYSCALL_FAIL(ret = select(1, &rfd, NULL, NULL, &to));
RETURN_ERROR_IF_SYSCALL_FAIL(
ret = RetryEINTR(recvmsg)(sock, msg, MSG_DONTWAIT));
return ret;
}
void RecvNoData(int sock) {
char data = 0;
struct iovec iov;
iov.iov_base = &data;
iov.iov_len = 1;
struct msghdr msg = {};
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
ASSERT_THAT(RetryEINTR(recvmsg)(sock, &msg, MSG_DONTWAIT),
SyscallFailsWithErrno(EAGAIN));
}
TestAddress TestAddress::WithPort(uint16_t port) const {
TestAddress addr = *this;
switch (addr.family()) {
case AF_INET:
reinterpret_cast<sockaddr_in*>(&addr.addr)->sin_port = htons(port);
break;
case AF_INET6:
reinterpret_cast<sockaddr_in6*>(&addr.addr)->sin6_port = htons(port);
break;
}
return addr;
}
namespace {
TestAddress V4Addr(std::string description, in_addr_t addr) {
TestAddress t(std::move(description));
t.addr.ss_family = AF_INET;
t.addr_len = sizeof(sockaddr_in);
reinterpret_cast<sockaddr_in*>(&t.addr)->sin_addr.s_addr = addr;
return t;
}
TestAddress V6Addr(std::string description, const in6_addr& addr) {
TestAddress t(std::move(description));
t.addr.ss_family = AF_INET6;
t.addr_len = sizeof(sockaddr_in6);
reinterpret_cast<sockaddr_in6*>(&t.addr)->sin6_addr = addr;
return t;
}
} // namespace
TestAddress V4AddrStr(std::string description, const char* addr) {
in_addr_t s_addr;
inet_pton(AF_INET, addr, &s_addr);
return V4Addr(description, s_addr);
}
TestAddress V6AddrStr(std::string description, const char* addr) {
struct in6_addr s_addr;
inet_pton(AF_INET6, addr, &s_addr);
return V6Addr(description, s_addr);
}
TestAddress V4Any() { return V4Addr("V4Any", htonl(INADDR_ANY)); }
TestAddress V4Broadcast() {
return V4Addr("V4Broadcast", htonl(INADDR_BROADCAST));
}
TestAddress V4Loopback() {
return V4Addr("V4Loopback", htonl(INADDR_LOOPBACK));
}
TestAddress V4LoopbackSubnetBroadcast() {
return V4AddrStr("V4LoopbackSubnetBroadcast", "127.255.255.255");
}
TestAddress V4MappedAny() { return V6AddrStr("V4MappedAny", "::ffff:0.0.0.0"); }
TestAddress V4MappedLoopback() {
return V6AddrStr("V4MappedLoopback", "::ffff:127.0.0.1");
}
TestAddress V4Multicast() {
return V4Addr("V4Multicast", inet_addr(kMulticastAddress));
}
TestAddress V4MulticastAllHosts() {
return V4Addr("V4MulticastAllHosts", htonl(INADDR_ALLHOSTS_GROUP));
}
TestAddress V6Any() { return V6Addr("V6Any", in6addr_any); }
TestAddress V6Loopback() { return V6Addr("V6Loopback", in6addr_loopback); }
TestAddress V6Multicast() { return V6AddrStr("V6Multicast", "ff05::1234"); }
TestAddress V6MulticastInterfaceLocalAllNodes() {
return V6AddrStr("V6MulticastInterfaceLocalAllNodes", "ff01::1");
}
TestAddress V6MulticastLinkLocalAllNodes() {
return V6AddrStr("V6MulticastLinkLocalAllNodes", "ff02::1");
}
TestAddress V6MulticastLinkLocalAllRouters() {
return V6AddrStr("V6MulticastLinkLocalAllRouters", "ff02::2");
}
// Checksum computes the internet checksum of a buffer.
uint16_t Checksum(uint16_t* buf, ssize_t buf_size) {
// Add up the 16-bit values in the buffer.
uint32_t total = 0;
for (unsigned int i = 0; i < buf_size; i += sizeof(*buf)) {
total += *buf;
buf++;
}
// If buf has an odd size, add the remaining byte.
if (buf_size % 2) {
total += *(reinterpret_cast<unsigned char*>(buf) - 1);
}
// This carries any bits past the lower 16 until everything fits in 16 bits.
while (total >> 16) {
uint16_t lower = total & 0xffff;
uint16_t upper = total >> 16;
total = lower + upper;
}
return ~total;
}
uint16_t IPChecksum(struct iphdr ip) {
return Checksum(reinterpret_cast<uint16_t*>(&ip), sizeof(ip));
}
// The pseudo-header defined in RFC 768 for calculating the UDP checksum.
struct udp_pseudo_hdr {
uint32_t srcip;
uint32_t destip;
char zero;
char protocol;
uint16_t udplen;
};
uint16_t UDPChecksum(struct iphdr iphdr, struct udphdr udphdr,
const char* payload, ssize_t payload_len) {
struct udp_pseudo_hdr phdr = {};
phdr.srcip = iphdr.saddr;
phdr.destip = iphdr.daddr;
phdr.zero = 0;
phdr.protocol = IPPROTO_UDP;
phdr.udplen = udphdr.len;
ssize_t buf_size = sizeof(phdr) + sizeof(udphdr) + payload_len;
char* buf = static_cast<char*>(malloc(buf_size));
memcpy(buf, &phdr, sizeof(phdr));
memcpy(buf + sizeof(phdr), &udphdr, sizeof(udphdr));
memcpy(buf + sizeof(phdr) + sizeof(udphdr), payload, payload_len);
uint16_t csum = Checksum(reinterpret_cast<uint16_t*>(buf), buf_size);
free(buf);
return csum;
}
uint16_t ICMPChecksum(struct icmphdr icmphdr, const char* payload,
ssize_t payload_len) {
ssize_t buf_size = sizeof(icmphdr) + payload_len;
char* buf = static_cast<char*>(malloc(buf_size));
memcpy(buf, &icmphdr, sizeof(icmphdr));
memcpy(buf + sizeof(icmphdr), payload, payload_len);
uint16_t csum = Checksum(reinterpret_cast<uint16_t*>(buf), buf_size);
free(buf);
return csum;
}
} // namespace testing
} // namespace gvisor
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