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fuchsia / fuchsia / 099dfaa57f8e77a17e57e89b07604f2a4d648410 / . / sdk / lib / fdio / socket.cc
blob: ce94bac2086ddeb919b508de70b3e0b3bbbdf592 [file] [log] [blame]
// Copyright 2017 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <lib/fitx/result.h>
#include <lib/stdcompat/span.h>
#include <lib/zx/socket.h>
#include <lib/zxio/cpp/create_with_type.h>
#include <lib/zxio/cpp/inception.h>
#include <lib/zxio/cpp/vector.h>
#include <lib/zxio/null.h>
#include <net/if.h>
#include <netinet/icmp6.h>
#include <netinet/if_ether.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <poll.h>
#include <sys/ioctl.h>
#include <algorithm>
#include <optional>
#include <type_traits>
#include <vector>
#include <netpacket/packet.h>
#include <safemath/safe_conversions.h>
#include "fdio_unistd.h"
#include "zxio.h"
namespace fsocket = fuchsia_posix_socket;
namespace frawsocket = fuchsia_posix_socket_raw;
namespace fpacketsocket = fuchsia_posix_socket_packet;
namespace fnet = fuchsia_net;
/* Socket class hierarchy
*
* Wrapper structs for supported FIDL protocols that encapsulate associated
* types and specialized per-protocol logic.
*
* +-------------------------+ +---------------------+
* | struct StreamSocket | | struct RawSocket |
* | fsocket::StreamSocket | | frawsocket:Socket |
* +-------------------------+ +---------------------+
* +-------------------------+ +-------------------------------------+
* | struct PacketSocket | | struct SynchronousDatagramSocket |
* | fpacketsocket::Socket | | fsocket:SynchronousDatagramSocket |
* +-------------------------+ +-------------------------------------+
*
* Utility classes constructed on-the-fly for common socket operations, enabled
* for relevant FIDL wrappers:
*
* +-------------------------+ +-------------------------+
* | class BaseSocket | | class NetworkSocket |
* | | | |
* | Enabled: | | Enabled: |
* | RawSocket | | RawSocket |
* | SyncDgramSocket | | SyncDgramSocket |
* | StreamSocket + -------> | StreamSocket |
* | PacketSocket | | |
* | | | Implements: |
* | Implements: | | Operations for network |
* | Operations for | | sockets |
* | all socket types | | |
* +-------------------------+ +-------------------------+
*
* Stateful class hierarchy for wrapping zircon primitives, enabled for
* relevant FIDL wrappers:
*
* +-----------------------------+
* | network_socket_with_event | +-----------------+
* +---------------+ | | | stream_socket |
* | packet_socket | | Enabled: | | |
* | | | RawSocket | | Enabled: |
* | Enabled: | | SyncDgramSocket | | StreamSocket |
* | PacketSocket | | | | |
* | | | | | Implements: |
* | Implements: | | Implements: Template | | Overrides for |
* | Overrides for | | for instantiating | | sockets using |
* | packet | | network sockets that | | zx::socket as |
* | sockets | | use FIDL over channel | | a data plane |
* | (AF_PACKET) | | (SOCK_RAW, SOCK_DGRAM) | | (SOCK_STREAM) |
* +---------------+ +-----------------------------+ +-----------------+
* ^ ^ ^ ^
* | | | |
* | | | |
* +-----------+------------+ +-------------+ |
* | | |
* | | |
* +-----------+-----------+ +-------+------+--------+
* | socket_with_event | | network_socket |
* | | | |
* | Enabled: | | Enabled: |
* | PacketSocket | | RawSocket |
* | RawSocket | | SyncDgramSocket |
* | SyncDgramSocket | | Streamsocket |
* | | <---------+---------> | |
* | Implements: Overrides | | | Implements: Overrides |
* | for sockets using | | | for network layer |
* | FIDL over channel | | | sockets |
* | as a data plane | | | |
* +-----------------------+ | +-----------------------+
* |
* +--------------+-------------+
* | base_socket |
* | |
* | Enabled: All |
* | |
* | Implements: Overrides for |
* | all socket types |
* +----------------------------+
* ^
* |
* |
* +----------+-----------+
* | zxio |
* | |
* | Implements: POSIX |
* | interface + behavior |
* | for generic fds |
* +----------------------+
*/
namespace {
// A helper structure to keep a socket address and the variants allocations on the stack.
struct SocketAddress {
zx_status_t LoadSockAddr(const struct sockaddr* addr, size_t addr_len) {
// Address length larger than sockaddr_storage causes an error for API compatibility only.
if (addr == nullptr || addr_len > sizeof(struct sockaddr_storage)) {
return ZX_ERR_INVALID_ARGS;
}
switch (addr->sa_family) {
case AF_INET: {
if (addr_len < sizeof(struct sockaddr_in)) {
return ZX_ERR_INVALID_ARGS;
}
const auto& s = *reinterpret_cast<const struct sockaddr_in*>(addr);
fnet::wire::Ipv4SocketAddress address = {
.port = ntohs(s.sin_port),
};
static_assert(sizeof(address.address.addr) == sizeof(s.sin_addr.s_addr),
"size of IPv4 addresses should be the same");
memcpy(address.address.addr.data(), &s.sin_addr.s_addr, sizeof(s.sin_addr.s_addr));
storage_ = address;
return ZX_OK;
}
case AF_INET6: {
if (addr_len < sizeof(struct sockaddr_in6)) {
return ZX_ERR_INVALID_ARGS;
}
const auto& s = *reinterpret_cast<const struct sockaddr_in6*>(addr);
fnet::wire::Ipv6SocketAddress address = {
.port = ntohs(s.sin6_port),
.zone_index = s.sin6_scope_id,
};
static_assert(
decltype(address.address.addr)::size() == std::size(decltype(s.sin6_addr.s6_addr){}),
"size of IPv6 addresses should be the same");
std::copy(std::begin(s.sin6_addr.s6_addr), std::end(s.sin6_addr.s6_addr),
address.address.addr.begin());
storage_ = address;
return ZX_OK;
}
default:
return ZX_ERR_INVALID_ARGS;
}
}
// Helpers from the reference documentation for std::visit<>, to allow
// visit-by-overload of the std::variant<> below:
template <class... Ts>
struct overloaded : Ts... {
using Ts::operator()...;
};
// explicit deduction guide (not needed as of C++20)
template <class... Ts>
overloaded(Ts...) -> overloaded<Ts...>;
template <typename F>
std::invoke_result_t<F, fnet::wire::SocketAddress> WithFIDL(F fn) {
return fn([this]() -> fnet::wire::SocketAddress {
if (storage_.has_value()) {
return std::visit(
overloaded{
[](fnet::wire::Ipv4SocketAddress& ipv4) {
return fnet::wire::SocketAddress::WithIpv4(
fidl::ObjectView<fnet::wire::Ipv4SocketAddress>::FromExternal(&ipv4));
},
[](fnet::wire::Ipv6SocketAddress& ipv6) {
return fnet::wire::SocketAddress::WithIpv6(
fidl::ObjectView<fnet::wire::Ipv6SocketAddress>::FromExternal(&ipv6));
},
},
storage_.value());
}
return {};
}());
}
private:
std::optional<std::variant<fnet::wire::Ipv4SocketAddress, fnet::wire::Ipv6SocketAddress>>
storage_;
};
// A helper structure to keep a packet info and any members' variants
// allocations on the stack.
struct PacketInfo {
zx_status_t LoadSockAddr(const sockaddr* addr, size_t addr_len) {
// Address length larger than sockaddr_storage causes an error for API compatibility only.
if (addr == nullptr || addr_len > sizeof(sockaddr_storage)) {
return ZX_ERR_INVALID_ARGS;
}
switch (addr->sa_family) {
case AF_PACKET: {
if (addr_len < sizeof(sockaddr_ll)) {
return ZX_ERR_INVALID_ARGS;
}
const auto& s = *reinterpret_cast<const sockaddr_ll*>(addr);
protocol_ = ntohs(s.sll_protocol);
interface_id_ = s.sll_ifindex;
switch (s.sll_halen) {
case 0:
eui48_storage_.reset();
return ZX_OK;
case ETH_ALEN: {
fnet::wire::MacAddress address;
static_assert(decltype(address.octets)::size() == ETH_ALEN,
"eui48 address must have the same size as ETH_ALEN");
static_assert(sizeof(s.sll_addr) == ETH_ALEN + 2);
memcpy(address.octets.data(), s.sll_addr, ETH_ALEN);
eui48_storage_ = address;
return ZX_OK;
}
default:
return ZX_ERR_NOT_SUPPORTED;
}
}
default:
return ZX_ERR_INVALID_ARGS;
}
}
template <typename F>
std::invoke_result_t<F, fidl::ObjectView<fpacketsocket::wire::PacketInfo>> WithFIDL(F fn) {
auto packet_info = [this]() -> fpacketsocket::wire::PacketInfo {
return {
.protocol = protocol_,
.interface_id = interface_id_,
.addr =
[this]() {
if (eui48_storage_.has_value()) {
return fpacketsocket::wire::HardwareAddress::WithEui48(
fidl::ObjectView<fnet::wire::MacAddress>::FromExternal(
&eui48_storage_.value()));
}
return fpacketsocket::wire::HardwareAddress::WithNone({});
}(),
};
}();
return fn(fidl::ObjectView<fpacketsocket::wire::PacketInfo>::FromExternal(&packet_info));
}
private:
decltype(fpacketsocket::wire::PacketInfo::protocol) protocol_;
decltype(fpacketsocket::wire::PacketInfo::interface_id) interface_id_;
std::optional<fnet::wire::MacAddress> eui48_storage_;
};
int16_t ParseSocketLevelControlMessage(fsocket::wire::SocketSendControlData& fidl_socket, int type,
const void* data, socklen_t len) {
// TODO(https://fxbug.dev/88984): Validate unsupported SOL_SOCKET control messages.
return 0;
}
int16_t ParseIpLevelControlMessage(fsocket::wire::IpSendControlData& fidl_ip, int type,
const void* data, socklen_t len) {
switch (type) {
case IP_TTL: {
int ttl;
if (len != sizeof(ttl)) {
return EINVAL;
}
memcpy(&ttl, data, sizeof(ttl));
if (ttl < 0 || ttl > std::numeric_limits<uint8_t>::max()) {
return EINVAL;
}
fidl_ip.set_ttl(static_cast<uint8_t>(ttl));
return 0;
}
default:
// TODO(https://fxbug.dev/88984): Validate unsupported SOL_IP control messages.
return 0;
}
}
int16_t ParseIpv6LevelControlMessage(fsocket::wire::Ipv6SendControlData& fidl_ipv6, int type,
const void* data, socklen_t data_len) {
switch (type) {
case IPV6_HOPLIMIT: {
int hoplimit;
if (data_len != sizeof(hoplimit)) {
return EINVAL;
}
memcpy(&hoplimit, data, sizeof(hoplimit));
if (hoplimit < -1 || hoplimit > std::numeric_limits<uint8_t>::max()) {
return EINVAL;
}
// Ignore hoplimit if it's -1 as it it is interpreted as if the cmsg was not present.
//
// https://github.com/torvalds/linux/blob/eaa54b1458c/net/ipv6/udp.c#L1531
if (hoplimit != -1) {
fidl_ipv6.set_hoplimit(static_cast<uint8_t>(hoplimit));
}
return 0;
}
default:
// TODO(https://fxbug.dev/88984): Validate unsupported SOL_IPV6 control messages.
return 0;
}
}
int16_t ParseControlMessage(fsocket::wire::SocketSendControlData& fidl_socket,
fidl::AnyArena& allocator, int level, int type, const void* data,
socklen_t data_len) {
switch (level) {
case SOL_SOCKET:
return ParseSocketLevelControlMessage(fidl_socket, type, data, data_len);
default:
return 0;
}
}
int16_t ParseControlMessage(fsocket::wire::NetworkSocketSendControlData& fidl_net,
fidl::AnyArena& allocator, int level, int type, const void* data,
socklen_t data_len) {
switch (level) {
case SOL_SOCKET:
if (!fidl_net.has_socket()) {
fidl_net.set_socket(allocator, fsocket::wire::SocketSendControlData(allocator));
}
return ParseSocketLevelControlMessage(fidl_net.socket(), type, data, data_len);
case SOL_IP:
if (!fidl_net.has_ip()) {
fidl_net.set_ip(allocator, fsocket::wire::IpSendControlData(allocator));
}
return ParseIpLevelControlMessage(fidl_net.ip(), type, data, data_len);
case SOL_IPV6:
if (!fidl_net.has_ipv6()) {
fidl_net.set_ipv6(allocator, fsocket::wire::Ipv6SendControlData(allocator));
}
return ParseIpv6LevelControlMessage(fidl_net.ipv6(), type, data, data_len);
default:
return 0;
}
}
int16_t ParseControlMessage(fsocket::wire::DatagramSocketSendControlData& fidl_dgram,
fidl::AnyArena& allocator, int level, int type, const void* data,
socklen_t data_len) {
if (!fidl_dgram.has_network()) {
fidl_dgram.set_network(allocator, fsocket::wire::NetworkSocketSendControlData(allocator));
}
return ParseControlMessage(fidl_dgram.network(), allocator, level, type, data, data_len);
}
int16_t ParseControlMessage(fpacketsocket::wire::SendControlData& fidl_packet,
fidl::AnyArena& allocator, int level, int type, const void* data,
socklen_t data_len) {
if (!fidl_packet.has_socket()) {
fidl_packet.set_socket(allocator, fsocket::wire::SocketSendControlData(allocator));
}
return ParseControlMessage(fidl_packet.socket(), allocator, level, type, data, data_len);
}
template <typename T>
fitx::result<int16_t, T> ParseControlMessages(const void* buf, socklen_t len,
fidl::AnyArena& allocator) {
if (buf == nullptr && len != 0) {
return fitx::error(static_cast<int16_t>(EFAULT));
}
T fidl_cmsg(allocator);
cpp20::span posix_cmsg(static_cast<const unsigned char*>(buf), len);
// Stop parsing once there is not enough bytes left to form a full cmsghdr.
// https://github.com/torvalds/linux/blob/42eb8fdac2f/net/core/sock.c#L2644
// https://github.com/torvalds/linux/blob/42eb8fdac2f/include/linux/socket.h#L115-L126
while (posix_cmsg.size() >= sizeof(cmsghdr)) {
// Do not access the control buffer directly, as it may be misaligned.
cmsghdr cmsg;
memcpy(&cmsg, posix_cmsg.data(), sizeof(cmsg));
// Validate the header length.
// https://github.com/torvalds/linux/blob/42eb8fdac2f/include/linux/socket.h#L119-L122
if (cmsg.cmsg_len < sizeof(cmsg) || cmsg.cmsg_len > posix_cmsg.size()) {
return fitx::error(static_cast<int16_t>(EINVAL));
}
const void* data = CMSG_DATA(posix_cmsg.data());
const socklen_t data_len = cmsg.cmsg_len - CMSG_ALIGN(sizeof(cmsghdr));
ZX_ASSERT_MSG(reinterpret_cast<const unsigned char*>(data) + data_len < posix_cmsg.end(),
"incoherent data buffer bounds, %p + %x > %p", data, data_len, posix_cmsg.end());
posix_cmsg = posix_cmsg.subspan(cmsg.cmsg_len);
int16_t err =
ParseControlMessage(fidl_cmsg, allocator, cmsg.cmsg_level, cmsg.cmsg_type, data, data_len);
if (err != 0) {
return fitx::error(err);
}
}
return fitx::success(fidl_cmsg);
}
class FidlControlDataProcessor {
public:
FidlControlDataProcessor(void* buf, socklen_t len)
: buffer_(cpp20::span{reinterpret_cast<unsigned char*>(buf), len}) {}
socklen_t Store(fsocket::wire::DatagramSocketRecvControlData const& control_data) {
socklen_t total = 0;
if (control_data.has_network()) {
total += Store(control_data.network());
}
return total;
}
socklen_t Store(fsocket::wire::NetworkSocketRecvControlData const& control_data) {
socklen_t total = 0;
if (control_data.has_socket()) {
total += Store(control_data.socket());
}
if (control_data.has_ip()) {
total += Store(control_data.ip());
}
if (control_data.has_ipv6()) {
total += Store(control_data.ipv6());
}
return total;
}
socklen_t Store(fpacketsocket::wire::RecvControlData const& control_data) {
socklen_t total = 0;
if (control_data.has_socket()) {
total += Store(control_data.socket());
}
return total;
}
private:
socklen_t Store(fsocket::wire::SocketRecvControlData const& control_data) {
socklen_t total = 0;
if (control_data.has_timestamp()) {
fsocket::wire::Timestamp timestamp = control_data.timestamp();
switch (timestamp.Which()) {
case fsocket::wire::Timestamp::Tag::kNanoseconds: {
std::chrono::duration t = std::chrono::nanoseconds(timestamp.nanoseconds());
std::chrono::seconds sec = std::chrono::duration_cast<std::chrono::seconds>(t);
const struct timespec ts = {
.tv_sec = sec.count(),
.tv_nsec = std::chrono::duration_cast<std::chrono::nanoseconds>(t - sec).count(),
};
total += StoreControlMessage(SOL_SOCKET, SO_TIMESTAMPNS, &ts, sizeof(ts));
break;
}
case fsocket::wire::Timestamp::Tag::kMicroseconds: {
std::chrono::duration t =
std::chrono::microseconds(control_data.timestamp().microseconds());
std::chrono::seconds sec = std::chrono::duration_cast<std::chrono::seconds>(t);
const struct timeval tv = {
.tv_sec = sec.count(),
.tv_usec = std::chrono::duration_cast<std::chrono::microseconds>(t - sec).count(),
};
total += StoreControlMessage(SOL_SOCKET, SO_TIMESTAMP, &tv, sizeof(tv));
break;
}
}
}
return total;
}
socklen_t Store(fsocket::wire::IpRecvControlData const& control_data) {
socklen_t total = 0;
if (control_data.has_tos()) {
const uint8_t tos = control_data.tos();
total += StoreControlMessage(IPPROTO_IP, IP_TOS, &tos, sizeof(tos));
}
if (control_data.has_ttl()) {
// Even though the ttl can be encoded in a single byte, Linux returns it as an `int` when it
// is received as a control message.
// https://github.com/torvalds/linux/blob/7e57714cd0a/net/ipv4/ip_sockglue.c#L67
const int ttl = static_cast<int>(control_data.ttl());
total += StoreControlMessage(IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl));
}
return total;
}
socklen_t Store(fsocket::wire::Ipv6RecvControlData const& control_data) {
socklen_t total = 0;
if (control_data.has_tclass()) {
// Even though the traffic class can be encoded in a single byte, Linux returns it as an `int`
// when it is received as a control message.
// https://github.com/torvalds/linux/blob/7e57714cd0a/include/net/ipv6.h#L968
const int tclass = static_cast<int>(control_data.tclass());
total += StoreControlMessage(IPPROTO_IPV6, IPV6_TCLASS, &tclass, sizeof(tclass));
}
if (control_data.has_hoplimit()) {
// Even though the hop limit can be encoded in a single byte, Linux returns it as an `int`
// when it is received as a control message.
// https://github.com/torvalds/linux/blob/7e57714cd0a/net/ipv6/datagram.c#L622
const int hoplimit = static_cast<int>(control_data.hoplimit());
total += StoreControlMessage(IPPROTO_IPV6, IPV6_HOPLIMIT, &hoplimit, sizeof(hoplimit));
}
if (control_data.has_pktinfo()) {
const fsocket::wire::Ipv6PktInfoRecvControlData& fidl_pktinfo = control_data.pktinfo();
in6_pktinfo pktinfo = {
.ipi6_ifindex = static_cast<unsigned int>(fidl_pktinfo.iface),
};
static_assert(
sizeof(pktinfo.ipi6_addr) == decltype(fidl_pktinfo.header_destination_addr.addr)::size(),
"mismatch between size of FIDL and in6_pktinfo IPv6 addresses");
memcpy(&pktinfo.ipi6_addr, fidl_pktinfo.header_destination_addr.addr.data(),
sizeof(pktinfo.ipi6_addr));
total += StoreControlMessage(IPPROTO_IPV6, IPV6_PKTINFO, &pktinfo, sizeof(pktinfo));
}
return total;
}
socklen_t StoreControlMessage(int level, int type, const void* data, socklen_t len) {
socklen_t cmsg_len = CMSG_LEN(len);
size_t bytes_left = buffer_.size();
if (bytes_left < cmsg_len) {
// Not enough space to store the entire control message.
// TODO(https://fxbug.dev/86146): Add support for truncated control messages (MSG_CTRUNC).
return 0;
}
// The user-provided pointer is not guaranteed to be aligned. So instead of casting it into a
// struct cmsghdr and writing to it directly, stack-allocate one and then copy it.
cmsghdr cmsg = {
.cmsg_len = cmsg_len,
.cmsg_level = level,
.cmsg_type = type,
};
unsigned char* buf = buffer_.data();
ZX_ASSERT_MSG(CMSG_DATA(buf) + len <= buf + bytes_left,
"buffer would overflow, %p + %x > %p + %zx", CMSG_DATA(buf), len, buf,
bytes_left);
memcpy(buf, &cmsg, sizeof(cmsg));
memcpy(CMSG_DATA(buf), data, len);
size_t bytes_consumed = std::min(CMSG_SPACE(len), bytes_left);
buffer_ = buffer_.subspan(bytes_consumed);
return static_cast<socklen_t>(bytes_consumed);
}
cpp20::span<unsigned char> buffer_;
};
fsocket::wire::RecvMsgFlags to_recvmsg_flags(int flags) {
fsocket::wire::RecvMsgFlags r;
if (flags & MSG_PEEK) {
r |= fsocket::wire::RecvMsgFlags::kPeek;
}
return r;
}
fsocket::wire::SendMsgFlags to_sendmsg_flags(int flags) { return fsocket::wire::SendMsgFlags(); }
socklen_t fidl_to_sockaddr(const fnet::wire::SocketAddress& fidl, void* addr, socklen_t addr_len) {
switch (fidl.Which()) {
case fnet::wire::SocketAddress::Tag::kIpv4: {
const auto& ipv4 = fidl.ipv4();
struct sockaddr_in tmp = {
.sin_family = AF_INET,
.sin_port = htons(ipv4.port),
};
static_assert(sizeof(tmp.sin_addr.s_addr) == sizeof(ipv4.address.addr),
"size of IPv4 addresses should be the same");
memcpy(&tmp.sin_addr.s_addr, ipv4.address.addr.data(), sizeof(ipv4.address.addr));
// Copy truncated address.
memcpy(addr, &tmp, std::min(sizeof(tmp), static_cast<size_t>(addr_len)));
return sizeof(tmp);
}
case fnet::wire::SocketAddress::Tag::kIpv6: {
const auto& ipv6 = fidl.ipv6();
struct sockaddr_in6 tmp = {
.sin6_family = AF_INET6,
.sin6_port = htons(ipv6.port),
.sin6_scope_id = static_cast<uint32_t>(ipv6.zone_index),
};
static_assert(std::size(tmp.sin6_addr.s6_addr) == decltype(ipv6.address.addr)::size(),
"size of IPv6 addresses should be the same");
std::copy(ipv6.address.addr.begin(), ipv6.address.addr.end(),
std::begin(tmp.sin6_addr.s6_addr));
// Copy truncated address.
memcpy(addr, &tmp, std::min(sizeof(tmp), static_cast<size_t>(addr_len)));
return sizeof(tmp);
}
}
}
uint16_t fidl_protoassoc_to_protocol(const fpacketsocket::wire::ProtocolAssociation& protocol) {
// protocol has an invalid tag when it's not provided by the server (when the socket is not
// associated).
//
// TODO(https://fxbug.dev/58503): Use better representation of nullable union when available.
if (protocol.has_invalid_tag()) {
return 0;
}
switch (protocol.Which()) {
case fpacketsocket::wire::ProtocolAssociation::Tag::kAll:
return ETH_P_ALL;
case fpacketsocket::wire::ProtocolAssociation::Tag::kSpecified:
return protocol.specified();
}
}
void populate_from_fidl_hwaddr(const fpacketsocket::wire::HardwareAddress& addr, sockaddr_ll& s) {
switch (addr.Which()) {
case fpacketsocket::wire::HardwareAddress::Tag::kUnknown:
// The server is newer than us and sending a variant we don't understand.
__FALLTHROUGH;
case fpacketsocket::wire::HardwareAddress::Tag::kNone:
s.sll_halen = 0;
break;
case fpacketsocket::wire::HardwareAddress::Tag::kEui48: {
const fnet::wire::MacAddress& eui48 = addr.eui48();
static_assert(std::size(decltype(s.sll_addr){}) == decltype(eui48.octets)::size() + 2);
std::copy(eui48.octets.begin(), eui48.octets.end(), std::begin(s.sll_addr));
s.sll_halen = decltype(eui48.octets)::size();
} break;
}
}
uint16_t fidl_hwtype_to_arphrd(const fpacketsocket::wire::HardwareType type) {
switch (type) {
case fpacketsocket::wire::HardwareType::kNetworkOnly:
return ARPHRD_NONE;
case fpacketsocket::wire::HardwareType::kEthernet:
return ARPHRD_ETHER;
case fpacketsocket::wire::HardwareType::kLoopback:
return ARPHRD_LOOPBACK;
}
}
uint8_t fidl_pkttype_to_pkttype(const fpacketsocket::wire::PacketType type) {
switch (type) {
case fpacketsocket::wire::PacketType::kHost:
return PACKET_HOST;
case fpacketsocket::wire::PacketType::kBroadcast:
return PACKET_BROADCAST;
case fpacketsocket::wire::PacketType::kMulticast:
return PACKET_MULTICAST;
case fpacketsocket::wire::PacketType::kOtherHost:
return PACKET_OTHERHOST;
case fpacketsocket::wire::PacketType::kOutgoing:
return PACKET_OUTGOING;
}
}
// https://github.com/torvalds/linux/blob/f2850dd5ee0/include/net/tcp.h#L1012
constexpr socklen_t kTcpCANameMax = 16;
constexpr const char kCcCubic[kTcpCANameMax] = "cubic";
constexpr const char kCcReno[kTcpCANameMax] = "reno";
struct SockOptResult {
const zx_status_t status;
const int16_t err;
bool ok() const { return status == ZX_OK && err == 0; }
static inline SockOptResult Ok() { return SockOptResult{ZX_OK, 0}; }
static inline SockOptResult Errno(int16_t err) { return SockOptResult{ZX_OK, err}; }
static inline SockOptResult Zx(zx_status_t status) { return SockOptResult{status, 0}; }
template <typename T>
static inline SockOptResult FromFidlResponse(const T& response) {
if (response.status() != ZX_OK) {
return SockOptResult::Zx(response.status());
}
const auto& result = response.value();
if (result.is_error()) {
return SockOptResult::Errno(static_cast<int16_t>(result.error_value()));
}
return SockOptResult::Ok();
}
};
class GetSockOptProcessor {
public:
GetSockOptProcessor(void* optval, socklen_t* optlen) : optval_(optval), optlen_(optlen) {}
template <typename T, typename F>
SockOptResult Process(T&& response, F getter) {
if (response.status() != ZX_OK) {
return SockOptResult::Zx(response.status());
}
const auto& result = response.value();
if (result.is_error()) {
return SockOptResult::Errno(static_cast<int16_t>(result.error_value()));
}
return StoreOption(getter(*result.value()));
}
template <typename T>
SockOptResult StoreOption(const T& value) {
static_assert(sizeof(T) != sizeof(T), "function must be specialized");
}
private:
SockOptResult StoreRaw(const void* data, socklen_t data_len) {
if (data_len > *optlen_) {
return SockOptResult::Errno(EINVAL);
}
memcpy(optval_, data, data_len);
*optlen_ = data_len;
return SockOptResult::Ok();
}
void* const optval_;
socklen_t* const optlen_;
};
template <>
SockOptResult GetSockOptProcessor::StoreOption(const int32_t& value) {
return StoreRaw(&value, sizeof(int32_t));
}
template <>
SockOptResult GetSockOptProcessor::StoreOption(const uint32_t& value) {
return StoreRaw(&value, sizeof(uint32_t));
}
template <>
SockOptResult GetSockOptProcessor::StoreOption(const uint8_t& value) {
return StoreRaw(&value, sizeof(uint8_t));
}
template <>
SockOptResult GetSockOptProcessor::StoreOption(const fsocket::wire::Domain& value) {
int32_t domain;
switch (value) {
case fsocket::wire::Domain::kIpv4:
domain = AF_INET;
break;
case fsocket::wire::Domain::kIpv6:
domain = AF_INET6;
break;
}
return StoreOption(domain);
}
template <>
SockOptResult GetSockOptProcessor::StoreOption(const bool& value) {
return StoreOption(static_cast<uint32_t>(value));
}
template <>
SockOptResult GetSockOptProcessor::StoreOption(const struct linger& value) {
return StoreRaw(&value, sizeof(struct linger));
}
template <>
SockOptResult GetSockOptProcessor::StoreOption(const fidl::StringView& value) {
if (value.empty()) {
*optlen_ = 0;
} else if (*optlen_ > value.size()) {
char* p = std::copy(value.begin(), value.end(), static_cast<char*>(optval_));
*p = 0;
*optlen_ = static_cast<socklen_t>(value.size()) + 1;
} else {
return SockOptResult::Errno(EINVAL);
}
return SockOptResult::Ok();
}
// Helper type to provide GetSockOptProcessor with a truncating string view conversion.
struct TruncatingStringView {
explicit TruncatingStringView(fidl::StringView string) : string(string) {}
fidl::StringView string;
};
template <>
SockOptResult GetSockOptProcessor::StoreOption(const TruncatingStringView& value) {
*optlen_ = std::min(*optlen_, static_cast<socklen_t>(value.string.size()));
char* p = std::copy_n(value.string.begin(), *optlen_ - 1, static_cast<char*>(optval_));
*p = 0;
return SockOptResult::Ok();
}
template <>
SockOptResult GetSockOptProcessor::StoreOption(const fsocket::wire::OptionalUint8& value) {
switch (value.Which()) {
case fsocket::wire::OptionalUint8::Tag::kValue:
return StoreOption(static_cast<int32_t>(value.value()));
case fsocket::wire::OptionalUint8::Tag::kUnset:
return StoreOption(-1);
}
}
template <>
SockOptResult GetSockOptProcessor::StoreOption(const fsocket::wire::OptionalUint32& value) {
switch (value.Which()) {
case fsocket::wire::OptionalUint32::Tag::kValue:
ZX_ASSERT(value.value() < std::numeric_limits<int32_t>::max());
return StoreOption(static_cast<int32_t>(value.value()));
case fsocket::wire::OptionalUint32::Tag::kUnset:
return StoreOption(-1);
}
}
template <>
SockOptResult GetSockOptProcessor::StoreOption(const fnet::wire::Ipv4Address& value) {
static_assert(sizeof(struct in_addr) == sizeof(value.addr));
return StoreRaw(value.addr.data(), sizeof(value.addr));
}
template <>
SockOptResult GetSockOptProcessor::StoreOption(const frawsocket::wire::Icmpv6Filter& value) {
static_assert(sizeof(icmp6_filter) == sizeof(value.blocked_types));
*optlen_ = std::min(static_cast<socklen_t>(sizeof(icmp6_filter)), *optlen_);
memcpy(optval_, value.blocked_types.data(), *optlen_);
return SockOptResult::Ok();
}
template <>
SockOptResult GetSockOptProcessor::StoreOption(const fsocket::wire::TcpInfo& value) {
tcp_info info;
// Explicitly initialize unsupported fields to a garbage value. It would probably be quieter to
// zero-initialize, but that can mask bugs in the interpretation of fields for which zero is a
// valid value.
//
// Note that "unsupported" includes fields not defined in FIDL *and* fields not populated by the
// server.
memset(&info, 0xff, sizeof(info));
if (value.has_state()) {
info.tcpi_state = [](fsocket::wire::TcpState state) -> uint8_t {
switch (state) {
case fsocket::wire::TcpState::kEstablished:
return TCP_ESTABLISHED;
case fsocket::wire::TcpState::kSynSent:
return TCP_SYN_SENT;
case fsocket::wire::TcpState::kSynRecv:
return TCP_SYN_RECV;
case fsocket::wire::TcpState::kFinWait1:
return TCP_FIN_WAIT1;
case fsocket::wire::TcpState::kFinWait2:
return TCP_FIN_WAIT2;
case fsocket::wire::TcpState::kTimeWait:
return TCP_TIME_WAIT;
case fsocket::wire::TcpState::kClose:
return TCP_CLOSE;
case fsocket::wire::TcpState::kCloseWait:
return TCP_CLOSE_WAIT;
case fsocket::wire::TcpState::kLastAck:
return TCP_LAST_ACK;
case fsocket::wire::TcpState::kListen:
return TCP_LISTEN;
case fsocket::wire::TcpState::kClosing:
return TCP_CLOSING;
}
}(value.state());
}
if (value.has_ca_state()) {
info.tcpi_ca_state = [](fsocket::wire::TcpCongestionControlState ca_state) -> uint8_t {
switch (ca_state) {
case fsocket::wire::TcpCongestionControlState::kOpen:
return TCP_CA_Open;
case fsocket::wire::TcpCongestionControlState::kDisorder:
return TCP_CA_Disorder;
case fsocket::wire::TcpCongestionControlState::kCongestionWindowReduced:
return TCP_CA_CWR;
case fsocket::wire::TcpCongestionControlState::kRecovery:
return TCP_CA_Recovery;
case fsocket::wire::TcpCongestionControlState::kLoss:
return TCP_CA_Loss;
}
}(value.ca_state());
}
if (value.has_rto_usec()) {
info.tcpi_rto = value.rto_usec();
}
if (value.has_rtt_usec()) {
info.tcpi_rtt = value.rtt_usec();
}
if (value.has_rtt_var_usec()) {
info.tcpi_rttvar = value.rtt_var_usec();
}
if (value.has_snd_ssthresh()) {
info.tcpi_snd_ssthresh = value.snd_ssthresh();
}
if (value.has_snd_cwnd()) {
info.tcpi_snd_cwnd = value.snd_cwnd();
}
if (value.has_reorder_seen()) {
info.tcpi_reord_seen = value.reorder_seen();
}
static_assert(sizeof(info) <= std::numeric_limits<socklen_t>::max());
return StoreRaw(&info, std::min(*optlen_, static_cast<socklen_t>(sizeof(info))));
}
// Used for various options that allow the caller to supply larger buffers than needed.
struct PartialCopy {
int32_t value;
// Appears to be true for IP_*, SO_* and false for IPV6_*.
bool allow_char;
};
template <>
SockOptResult GetSockOptProcessor::StoreOption(const PartialCopy& value) {
socklen_t want_size =
*optlen_ < sizeof(int32_t) && value.allow_char ? sizeof(uint8_t) : sizeof(value.value);
*optlen_ = std::min(want_size, *optlen_);
memcpy(optval_, &value.value, *optlen_);
return SockOptResult::Ok();
}
class SetSockOptProcessor {
public:
SetSockOptProcessor(const void* optval, socklen_t optlen) : optval_(optval), optlen_(optlen) {}
template <typename T>
int16_t Get(T& out) {
if (optlen_ < sizeof(T)) {
return EINVAL;
}
memcpy(&out, optval_, sizeof(T));
return 0;
}
template <typename T, typename F>
SockOptResult Process(F f) {
T v;
int16_t result = Get(v);
if (result) {
return SockOptResult::Errno(result);
}
return SockOptResult::FromFidlResponse(f(std::move(v)));
}
private:
const void* const optval_;
socklen_t const optlen_;
};
template <>
int16_t SetSockOptProcessor::Get(fidl::StringView& out) {
const char* optval = static_cast<const char*>(optval_);
out = fidl::StringView::FromExternal(optval, strnlen(optval, optlen_));
return 0;
}
template <>
int16_t SetSockOptProcessor::Get(bool& out) {
int32_t i;
int16_t r = Get(i);
out = i != 0;
return r;
}
template <>
int16_t SetSockOptProcessor::Get(uint32_t& out) {
int32_t& alt = *reinterpret_cast<int32_t*>(&out);
if (int16_t r = Get(alt); r) {
return r;
}
if (alt < 0) {
return EINVAL;
}
return 0;
}
template <>
int16_t SetSockOptProcessor::Get(fsocket::wire::OptionalUint8& out) {
int32_t i;
if (int16_t r = Get(i); r) {
return r;
}
if (i < -1 || i > std::numeric_limits<uint8_t>::max()) {
return EINVAL;
}
if (i == -1) {
out = fsocket::wire::OptionalUint8::WithUnset({});
} else {
out = fsocket::wire::OptionalUint8::WithValue(static_cast<uint8_t>(i));
}
return 0;
}
// Like OptionalUint8, but permits truncation to a single byte.
struct OptionalUint8CharAllowed {
fsocket::wire::OptionalUint8 inner;
};
template <>
int16_t SetSockOptProcessor::Get(OptionalUint8CharAllowed& out) {
if (optlen_ == sizeof(uint8_t)) {
out.inner = fsocket::wire::OptionalUint8::WithValue(*static_cast<const uint8_t*>(optval_));
return 0;
}
return Get(out.inner);
}
template <>
int16_t SetSockOptProcessor::Get(fsocket::wire::IpMulticastMembership& out) {
union {
struct ip_mreqn reqn;
struct ip_mreq req;
} r;
struct in_addr* local;
struct in_addr* mcast;
if (optlen_ < sizeof(struct ip_mreqn)) {
if (Get(r.req) != 0) {
return EINVAL;
}
out.iface = 0;
local = &r.req.imr_interface;
mcast = &r.req.imr_multiaddr;
} else {
if (Get(r.reqn) != 0) {
return EINVAL;
}
out.iface = r.reqn.imr_ifindex;
local = &r.reqn.imr_address;
mcast = &r.reqn.imr_multiaddr;
}
static_assert(sizeof(out.local_addr.addr) == sizeof(*local));
memcpy(out.local_addr.addr.data(), local, sizeof(*local));
static_assert(sizeof(out.mcast_addr.addr) == sizeof(*mcast));
memcpy(out.mcast_addr.addr.data(), mcast, sizeof(*mcast));
return 0;
}
template <>
int16_t SetSockOptProcessor::Get(fsocket::wire::Ipv6MulticastMembership& out) {
struct ipv6_mreq req;
if (Get(req) != 0) {
return EINVAL;
}
out.iface = req.ipv6mr_interface;
static_assert(std::size(req.ipv6mr_multiaddr.s6_addr) == decltype(out.mcast_addr.addr)::size());
std::copy(std::begin(req.ipv6mr_multiaddr.s6_addr), std::end(req.ipv6mr_multiaddr.s6_addr),
out.mcast_addr.addr.begin());
return 0;
}
template <>
int16_t SetSockOptProcessor::Get(frawsocket::wire::Icmpv6Filter& out) {
struct icmp6_filter filter;
if (Get(filter) != 0) {
return EINVAL;
}
static_assert(sizeof(filter) == sizeof(out.blocked_types));
memcpy(out.blocked_types.data(), &filter, sizeof(filter));
return 0;
}
template <>
int16_t SetSockOptProcessor::Get(fsocket::wire::TcpCongestionControl& out) {
if (strncmp(static_cast<const char*>(optval_), kCcCubic, optlen_) == 0) {
out = fsocket::wire::TcpCongestionControl::kCubic;
return 0;
}
if (strncmp(static_cast<const char*>(optval_), kCcReno, optlen_) == 0) {
out = fsocket::wire::TcpCongestionControl::kReno;
return 0;
}
return ENOENT;
}
struct IntOrChar {
int32_t value;
};
template <>
int16_t SetSockOptProcessor::Get(IntOrChar& out) {
if (Get(out.value) == 0) {
return 0;
}
if (optlen_ == 0) {
return EINVAL;
}
out.value = *static_cast<const uint8_t*>(optval_);
return 0;
}
template <typename T,
typename = std::enable_if_t<
std::is_same_v<T, fidl::WireSyncClient<fsocket::SynchronousDatagramSocket>> ||
std::is_same_v<T, fidl::WireSyncClient<fsocket::StreamSocket>> ||
std::is_same_v<T, fidl::WireSyncClient<frawsocket::Socket>> ||
std::is_same_v<T, fidl::WireSyncClient<fpacketsocket::Socket>>>>
struct BaseSocket {
static_assert(std::is_same_v<T, fidl::WireSyncClient<fsocket::SynchronousDatagramSocket>> ||
std::is_same_v<T, fidl::WireSyncClient<fsocket::StreamSocket>> ||
std::is_same_v<T, fidl::WireSyncClient<frawsocket::Socket>> ||
std::is_same_v<T, fidl::WireSyncClient<fpacketsocket::Socket>>);
public:
explicit BaseSocket(T& client) : client_(client) {}
T& client() { return client_; }
SockOptResult get_solsocket_sockopt_fidl(int optname, void* optval, socklen_t* optlen) {
GetSockOptProcessor proc(optval, optlen);
switch (optname) {
case SO_TYPE:
if constexpr (std::is_same_v<T, fidl::WireSyncClient<fsocket::SynchronousDatagramSocket>>) {
return proc.StoreOption<int32_t>(SOCK_DGRAM);
}
if constexpr (std::is_same_v<T, fidl::WireSyncClient<fsocket::StreamSocket>>) {
return proc.StoreOption<int32_t>(SOCK_STREAM);
}
if constexpr (std::is_same_v<T, fidl::WireSyncClient<frawsocket::Socket>>) {
return proc.StoreOption<int32_t>(SOCK_RAW);
}
if constexpr (std::is_same_v<T, fidl::WireSyncClient<fpacketsocket::Socket>>) {
return proc.Process(client()->GetInfo(), [](const auto& response) {
switch (response.kind) {
case fpacketsocket::wire::Kind::kNetwork:
return SOCK_DGRAM;
case fpacketsocket::wire::Kind::kLink:
return SOCK_RAW;
}
});
}
case SO_DOMAIN:
if constexpr (std::is_same_v<T, fidl::WireSyncClient<fpacketsocket::Socket>>) {
return proc.StoreOption<int32_t>(AF_PACKET);
} else {
return proc.Process(client()->GetInfo(),
[](const auto& response) { return response.domain; });
}
case SO_TIMESTAMP:
return proc.Process(client()->GetTimestamp(), [](const auto& response) {
return PartialCopy{
.value = response.value == fsocket::wire::TimestampOption::kMicrosecond,
.allow_char = false,
};
});
case SO_TIMESTAMPNS:
return proc.Process(client()->GetTimestamp(), [](const auto& response) {
return PartialCopy{
.value = response.value == fsocket::wire::TimestampOption::kNanosecond,
.allow_char = false,
};
});
case SO_PROTOCOL:
if constexpr (std::is_same_v<T, fidl::WireSyncClient<fsocket::SynchronousDatagramSocket>>) {
return proc.Process(client()->GetInfo(), [](const auto& response) {
switch (response.proto) {
case fsocket::wire::DatagramSocketProtocol::kUdp:
return IPPROTO_UDP;
case fsocket::wire::DatagramSocketProtocol::kIcmpEcho:
switch (response.domain) {
case fsocket::wire::Domain::kIpv4:
return IPPROTO_ICMP;
case fsocket::wire::Domain::kIpv6:
return IPPROTO_ICMPV6;
}
}
});
}
if constexpr (std::is_same_v<T, fidl::WireSyncClient<fsocket::StreamSocket>>) {
return proc.Process(client()->GetInfo(), [](const auto& response) {
switch (response.proto) {
case fsocket::wire::StreamSocketProtocol::kTcp:
return IPPROTO_TCP;
}
});
}
if constexpr (std::is_same_v<T, fidl::WireSyncClient<frawsocket::Socket>>) {
return proc.Process(client()->GetInfo(), [](const auto& response) {
switch (response.proto.Which()) {
case frawsocket::wire::ProtocolAssociation::Tag::kUnassociated:
return IPPROTO_RAW;
case frawsocket::wire::ProtocolAssociation::Tag::kAssociated:
return static_cast<int>(response.proto.associated());
}
});
}
if constexpr (std::is_same_v<T, fidl::WireSyncClient<fpacketsocket::Socket>>) {
return proc.StoreOption<int32_t>(0);
}
case SO_ERROR: {
auto response = client()->GetError();
if (response.status() != ZX_OK) {
return SockOptResult::Zx(response.status());
}
int32_t error_code = 0;
const auto& result = response.value();
if (result.is_error()) {
error_code = static_cast<int32_t>(result.error_value());
}
return proc.StoreOption(error_code);
}
case SO_SNDBUF:
return proc.Process(client()->GetSendBuffer(), [](const auto& response) {
return static_cast<uint32_t>(response.value_bytes);
});
case SO_RCVBUF:
return proc.Process(client()->GetReceiveBuffer(), [](const auto& response) {
return static_cast<uint32_t>(response.value_bytes);
});
case SO_REUSEADDR:
return proc.Process(client()->GetReuseAddress(),
[](const auto& response) { return response.value; });
case SO_REUSEPORT:
return proc.Process(client()->GetReusePort(),
[](const auto& response) { return response.value; });
case SO_BINDTODEVICE:
return proc.Process(
client()->GetBindToDevice(),
[](auto& response) -> const fidl::StringView& { return response.value; });
case SO_BROADCAST:
return proc.Process(client()->GetBroadcast(),
[](const auto& response) { return response.value; });
case SO_KEEPALIVE:
return proc.Process(client()->GetKeepAlive(),
[](const auto& response) { return response.value; });
case SO_LINGER:
return proc.Process(client()->GetLinger(), [](const auto& response) {
struct linger l;
l.l_onoff = response.linger;
// NB: l_linger is typed as int but interpreted as unsigned by
// linux.
l.l_linger = static_cast<int>(response.length_secs);
return l;
});
case SO_ACCEPTCONN:
return proc.Process(client()->GetAcceptConn(),
[](const auto& response) { return response.value; });
case SO_OOBINLINE:
return proc.Process(client()->GetOutOfBandInline(),
[](const auto& response) { return response.value; });
case SO_NO_CHECK:
return proc.Process(client()->GetNoCheck(), [](const auto& response) {
return PartialCopy{
.value = response.value,
.allow_char = false,
};
});
case SO_SNDTIMEO:
case SO_RCVTIMEO:
case SO_PEERCRED:
return SockOptResult::Errno(EOPNOTSUPP);
default:
return SockOptResult::Errno(ENOPROTOOPT);
}
}
SockOptResult set_solsocket_sockopt_fidl(int optname, const void* optval, socklen_t optlen) {
SetSockOptProcessor proc(optval, optlen);
switch (optname) {
case SO_TIMESTAMP:
return proc.Process<bool>([this](bool value) {
using fsocket::wire::TimestampOption;
TimestampOption opt = value ? TimestampOption::kMicrosecond : TimestampOption::kDisabled;
return client()->SetTimestamp(opt);
});
case SO_TIMESTAMPNS:
return proc.Process<bool>([this](bool value) {
using fsocket::wire::TimestampOption;
TimestampOption opt = value ? TimestampOption::kNanosecond : TimestampOption::kDisabled;
return client()->SetTimestamp(opt);
});
case SO_SNDBUF:
return proc.Process<int32_t>([this](int32_t value) {
// NB: SNDBUF treated as unsigned, we just cast the value to skip sign check.
return client()->SetSendBuffer(static_cast<uint64_t>(value));
});
case SO_RCVBUF:
return proc.Process<int32_t>([this](int32_t value) {
// NB: RCVBUF treated as unsigned, we just cast the value to skip sign check.
return client()->SetReceiveBuffer(static_cast<uint64_t>(value));
});
case SO_REUSEADDR:
return proc.Process<bool>([this](bool value) { return client()->SetReuseAddress(value); });
case SO_REUSEPORT:
return proc.Process<bool>([this](bool value) { return client()->SetReusePort(value); });
case SO_BINDTODEVICE:
return proc.Process<fidl::StringView>(
[this](fidl::StringView value) { return client()->SetBindToDevice(value); });
case SO_BROADCAST:
return proc.Process<bool>([this](bool value) { return client()->SetBroadcast(value); });
case SO_KEEPALIVE:
return proc.Process<bool>([this](bool value) { return client()->SetKeepAlive(value); });
case SO_LINGER:
return proc.Process<struct linger>([this](struct linger value) {
// NB: l_linger is typed as int but interpreted as unsigned by linux.
return client()->SetLinger(value.l_onoff != 0, static_cast<uint32_t>(value.l_linger));
});
case SO_OOBINLINE:
return proc.Process<bool>(
[this](bool value) { return client()->SetOutOfBandInline(value); });
case SO_NO_CHECK:
return proc.Process<bool>([this](bool value) { return client()->SetNoCheck(value); });
case SO_SNDTIMEO:
case SO_RCVTIMEO:
return SockOptResult::Errno(ENOTSUP);
default:
return SockOptResult::Errno(ENOPROTOOPT);
}
}
private:
T& client_;
};
template <typename T,
typename = std::enable_if_t<
std::is_same_v<T, fidl::WireSyncClient<fsocket::SynchronousDatagramSocket>> ||
std::is_same_v<T, fidl::WireSyncClient<fsocket::StreamSocket>> ||
std::is_same_v<T, fidl::WireSyncClient<frawsocket::Socket>>>>
struct BaseNetworkSocket : public BaseSocket<T> {
static_assert(std::is_same_v<T, fidl::WireSyncClient<fsocket::SynchronousDatagramSocket>> ||
std::is_same_v<T, fidl::WireSyncClient<fsocket::StreamSocket>> ||
std::is_same_v<T, fidl::WireSyncClient<frawsocket::Socket>>);
public:
using BaseSocket = BaseSocket<T>;
using BaseSocket::client;
explicit BaseNetworkSocket(T& client) : BaseSocket(client) {}
zx_status_t bind(const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) {
SocketAddress fidl_addr;
zx_status_t status = fidl_addr.LoadSockAddr(addr, addrlen);
if (status != ZX_OK) {
return status;
}
auto response = fidl_addr.WithFIDL(
[this](fnet::wire::SocketAddress address) { return client()->Bind(address); });
status = response.status();
if (status != ZX_OK) {
return status;
}
auto const& result = response.value();
if (result.is_error()) {
*out_code = static_cast<int16_t>(result.error_value());
return ZX_OK;
}
*out_code = 0;
return ZX_OK;
}
zx_status_t connect(const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) {
// If address is AF_UNSPEC we should call disconnect.
if (addr->sa_family == AF_UNSPEC) {
auto response = client()->Disconnect();
zx_status_t status = response.status();
if (status != ZX_OK) {
return status;
}
const auto& result = response.value();
if (result.is_error()) {
*out_code = static_cast<int16_t>(result.error_value());
} else {
*out_code = 0;
}
return ZX_OK;
}
SocketAddress fidl_addr;
zx_status_t status = fidl_addr.LoadSockAddr(addr, addrlen);
if (status != ZX_OK) {
return status;
}
auto response = fidl_addr.WithFIDL(
[this](fnet::wire::SocketAddress address) { return client()->Connect(address); });
status = response.status();
if (status != ZX_OK) {
return status;
}
auto const& result = response.value();
if (result.is_error()) {
*out_code = static_cast<int16_t>(result.error_value());
return ZX_OK;
}
*out_code = 0;
return ZX_OK;
}
template <typename R>
zx_status_t getname(R&& response, struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) {
zx_status_t status = response.status();
if (status != ZX_OK) {
return status;
}
auto const& result = response.value();
if (result.is_error()) {
*out_code = static_cast<int16_t>(result.error_value());
return ZX_OK;
}
if (addrlen == nullptr || (*addrlen != 0 && addr == nullptr)) {
*out_code = EFAULT;
return ZX_OK;
}
*out_code = 0;
auto const& out = result.value()->addr;
*addrlen = fidl_to_sockaddr(out, addr, *addrlen);
return ZX_OK;
}
zx_status_t getsockname(struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) {
return getname(client()->GetSockName(), addr, addrlen, out_code);
}
zx_status_t getpeername(struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) {
return getname(client()->GetPeerName(), addr, addrlen, out_code);
}
SockOptResult getsockopt_fidl(int level, int optname, void* optval, socklen_t* optlen) {
GetSockOptProcessor proc(optval, optlen);
switch (level) {
case SOL_SOCKET:
return BaseSocket::get_solsocket_sockopt_fidl(optname, optval, optlen);
case SOL_IP:
switch (optname) {
case IP_TTL:
return proc.Process(client()->GetIpTtl(), [](const auto& response) {
return PartialCopy{
.value = response.value,
.allow_char = true,
};
});
case IP_RECVTTL:
return proc.Process(client()->GetIpReceiveTtl(), [](const auto& response) {
return PartialCopy{
.value = response.value,
.allow_char = true,
};
});
case IP_MULTICAST_TTL:
return proc.Process(client()->GetIpMulticastTtl(), [](const auto& response) {
return PartialCopy{
.value = response.value,
.allow_char = true,
};
});
case IP_MULTICAST_IF:
return proc.Process(client()->GetIpMulticastInterface(),
[](const auto& response) { return response.value; });
case IP_MULTICAST_LOOP:
return proc.Process(client()->GetIpMulticastLoopback(), [](const auto& response) {
return PartialCopy{
.value = response.value,
.allow_char = true,
};
});
case IP_TOS:
return proc.Process(client()->GetIpTypeOfService(), [](const auto& response) {
return PartialCopy{
.value = response.value,
.allow_char = true,
};
});
case IP_RECVTOS:
return proc.Process(client()->GetIpReceiveTypeOfService(), [](const auto& response) {
return PartialCopy{
.value = response.value,
.allow_char = true,
};
});
case IP_PKTINFO:
return proc.Process(client()->GetIpPacketInfo(),
[](const auto& response) { return response.value; });
default:
return SockOptResult::Errno(ENOPROTOOPT);
}
case SOL_IPV6:
switch (optname) {
case IPV6_V6ONLY:
return proc.Process(client()->GetIpv6Only(),
[](const auto& response) { return response.value; });
case IPV6_TCLASS:
return proc.Process(client()->GetIpv6TrafficClass(), [](const auto& response) {
return PartialCopy{
.value = response.value,
.allow_char = false,
};
});
case IPV6_MULTICAST_IF:
return proc.Process(client()->GetIpv6MulticastInterface(), [](const auto& response) {
return static_cast<uint32_t>(response.value);
});
case IPV6_UNICAST_HOPS:
return proc.Process(client()->GetIpv6UnicastHops(), [](const auto& response) {
return PartialCopy{
.value = response.value,
.allow_char = false,
};
});
case IPV6_MULTICAST_HOPS:
return proc.Process(client()->GetIpv6MulticastHops(), [](const auto& response) {
return PartialCopy{
.value = response.value,
.allow_char = false,
};
});
case IPV6_MULTICAST_LOOP:
return proc.Process(client()->GetIpv6MulticastLoopback(), [](const auto& response) {
return PartialCopy{
.value = response.value,
.allow_char = false,
};
});
case IPV6_RECVTCLASS:
return proc.Process(client()->GetIpv6ReceiveTrafficClass(), [](const auto& response) {
return PartialCopy{
.value = response.value,
.allow_char = false,
};
});
case IPV6_RECVHOPLIMIT:
return proc.Process(client()->GetIpv6ReceiveHopLimit(), [](const auto& response) {
return PartialCopy{
.value = response.value,
.allow_char = false,
};
});
case IPV6_RECVPKTINFO:
return proc.Process(client()->GetIpv6ReceivePacketInfo(), [](const auto& response) {
return PartialCopy{
.value = response.value,
.allow_char = false,
};
});
default:
return SockOptResult::Errno(ENOPROTOOPT);
}
case SOL_TCP:
if constexpr (std::is_same_v<T, fidl::WireSyncClient<fsocket::StreamSocket>>) {
switch (optname) {
case TCP_NODELAY:
return proc.Process(client()->GetTcpNoDelay(),
[](const auto& response) { return response.value; });
case TCP_CORK:
return proc.Process(client()->GetTcpCork(),
[](const auto& response) { return response.value; });
case TCP_QUICKACK:
return proc.Process(client()->GetTcpQuickAck(),
[](const auto& response) { return response.value; });
case TCP_MAXSEG:
return proc.Process(client()->GetTcpMaxSegment(),
[](const auto& response) { return response.value_bytes; });
case TCP_KEEPIDLE:
return proc.Process(client()->GetTcpKeepAliveIdle(),
[](const auto& response) { return response.value_secs; });
case TCP_KEEPINTVL:
return proc.Process(client()->GetTcpKeepAliveInterval(),
[](const auto& response) { return response.value_secs; });
case TCP_KEEPCNT:
return proc.Process(client()->GetTcpKeepAliveCount(),
[](const auto& response) { return response.value; });
case TCP_USER_TIMEOUT:
return proc.Process(client()->GetTcpUserTimeout(),
[](const auto& response) { return response.value_millis; });
case TCP_CONGESTION:
return proc.Process(client()->GetTcpCongestion(), [](const auto& response) {
switch (response.value) {
case fsocket::wire::TcpCongestionControl::kCubic:
return TruncatingStringView(
fidl::StringView::FromExternal(kCcCubic, sizeof(kCcCubic)));
case fsocket::wire::TcpCongestionControl::kReno:
return TruncatingStringView(
fidl::StringView::FromExternal(kCcReno, sizeof(kCcReno)));
}
});
case TCP_DEFER_ACCEPT:
return proc.Process(client()->GetTcpDeferAccept(),
[](const auto& response) { return response.value_secs; });
case TCP_INFO:
return proc.Process(
client()->GetTcpInfo(),
[](const auto& response) -> const auto& { return response.info; });
case TCP_SYNCNT:
return proc.Process(client()->GetTcpSynCount(),
[](const auto& response) { return response.value; });
case TCP_WINDOW_CLAMP:
return proc.Process(client()->GetTcpWindowClamp(),
[](const auto& response) { return response.value; });
case TCP_LINGER2:
return proc.Process(client()->GetTcpLinger(),
[](const auto& response) -> const fsocket::wire::OptionalUint32& {
return response.value_secs;
});
default:
return SockOptResult::Errno(ENOPROTOOPT);
}
} else {
__FALLTHROUGH;
}
default:
return SockOptResult::Errno(EPROTONOSUPPORT);
}
}
SockOptResult setsockopt_fidl(int level, int optname, const void* optval, socklen_t optlen) {
SetSockOptProcessor proc(optval, optlen);
switch (level) {
case SOL_SOCKET:
return BaseSocket::set_solsocket_sockopt_fidl(optname, optval, optlen);
case SOL_IP:
switch (optname) {
case IP_MULTICAST_TTL:
return proc.Process<OptionalUint8CharAllowed>([this](OptionalUint8CharAllowed value) {
return client()->SetIpMulticastTtl(value.inner);
});
case IP_ADD_MEMBERSHIP: {
return proc.Process<fsocket::wire::IpMulticastMembership>(
[this](fsocket::wire::IpMulticastMembership value) {
return client()->AddIpMembership(value);
});
}
case IP_DROP_MEMBERSHIP:
return proc.Process<fsocket::wire::IpMulticastMembership>(
[this](fsocket::wire::IpMulticastMembership value) {
return client()->DropIpMembership(value);
});
case IP_MULTICAST_IF: {
if (optlen == sizeof(struct in_addr)) {
return proc.Process<struct in_addr>([this](struct in_addr value) {
fnet::wire::Ipv4Address addr;
static_assert(sizeof(addr.addr) == sizeof(value.s_addr));
memcpy(addr.addr.data(), &value.s_addr, sizeof(value.s_addr));
return client()->SetIpMulticastInterface(0, addr);
});
}
return proc.Process<fsocket::wire::IpMulticastMembership>(
[this](fsocket::wire::IpMulticastMembership value) {
return client()->SetIpMulticastInterface(value.iface, value.local_addr);
});
}
case IP_MULTICAST_LOOP:
return proc.Process<IntOrChar>([this](IntOrChar value) {
return client()->SetIpMulticastLoopback(value.value != 0);
});
case IP_TTL:
return proc.Process<OptionalUint8CharAllowed>(
[this](OptionalUint8CharAllowed value) { return client()->SetIpTtl(value.inner); });
case IP_RECVTTL:
return proc.Process<IntOrChar>(
[this](IntOrChar value) { return client()->SetIpReceiveTtl(value.value != 0); });
case IP_TOS:
if (optlen == 0) {
return SockOptResult::Ok();
}
return proc.Process<IntOrChar>([this](IntOrChar value) {
return client()->SetIpTypeOfService(static_cast<uint8_t>(value.value));
});
case IP_RECVTOS:
return proc.Process<IntOrChar>([this](IntOrChar value) {
return client()->SetIpReceiveTypeOfService(value.value != 0);
});
case IP_PKTINFO:
return proc.Process<IntOrChar>(
[this](IntOrChar value) { return client()->SetIpPacketInfo(value.value != 0); });
case MCAST_JOIN_GROUP:
return SockOptResult::Errno(ENOTSUP);
default:
return SockOptResult::Errno(ENOPROTOOPT);
}
case SOL_IPV6:
switch (optname) {
case IPV6_V6ONLY:
return proc.Process<bool>([this](bool value) { return client()->SetIpv6Only(value); });
case IPV6_ADD_MEMBERSHIP:
return proc.Process<fsocket::wire::Ipv6MulticastMembership>(
[this](fsocket::wire::Ipv6MulticastMembership value) {
return client()->AddIpv6Membership(value);
});
case IPV6_DROP_MEMBERSHIP:
return proc.Process<fsocket::wire::Ipv6MulticastMembership>(
[this](fsocket::wire::Ipv6MulticastMembership value) {
return client()->DropIpv6Membership(value);
});
case IPV6_MULTICAST_IF:
return proc.Process<IntOrChar>([this](IntOrChar value) {
return client()->SetIpv6MulticastInterface(value.value);
});
case IPV6_UNICAST_HOPS:
return proc.Process<fsocket::wire::OptionalUint8>(
[this](fsocket::wire::OptionalUint8 value) {
return client()->SetIpv6UnicastHops(value);
});
case IPV6_MULTICAST_HOPS:
return proc.Process<fsocket::wire::OptionalUint8>(
[this](fsocket::wire::OptionalUint8 value) {
return client()->SetIpv6MulticastHops(value);
});
case IPV6_MULTICAST_LOOP:
return proc.Process<bool>(
[this](bool value) { return client()->SetIpv6MulticastLoopback(value); });
case IPV6_TCLASS:
return proc.Process<fsocket::wire::OptionalUint8>(
[this](fsocket::wire::OptionalUint8 value) {
return client()->SetIpv6TrafficClass(value);
});
case IPV6_RECVTCLASS:
return proc.Process<bool>(
[this](bool value) { return client()->SetIpv6ReceiveTrafficClass(value); });
case IPV6_RECVHOPLIMIT:
return proc.Process<bool>(
[this](bool value) { return client()->SetIpv6ReceiveHopLimit(value); });
case IPV6_RECVPKTINFO:
return proc.Process<bool>(
[this](bool value) { return client()->SetIpv6ReceivePacketInfo(value); });
default:
return SockOptResult::Errno(ENOPROTOOPT);
}
case SOL_TCP:
if constexpr (std::is_same_v<T, fidl::WireSyncClient<fsocket::StreamSocket>>) {
switch (optname) {
case TCP_NODELAY:
return proc.Process<bool>(
[this](bool value) { return client()->SetTcpNoDelay(value); });
case TCP_CORK:
return proc.Process<bool>([this](bool value) { return client()->SetTcpCork(value); });
case TCP_QUICKACK:
return proc.Process<bool>(
[this](bool value) { return client()->SetTcpQuickAck(value); });
case TCP_MAXSEG:
return proc.Process<uint32_t>(
[this](uint32_t value) { return client()->SetTcpMaxSegment(value); });
case TCP_KEEPIDLE:
return proc.Process<uint32_t>(
[this](uint32_t value) { return client()->SetTcpKeepAliveIdle(value); });
case TCP_KEEPINTVL:
return proc.Process<uint32_t>(
[this](uint32_t value) { return client()->SetTcpKeepAliveInterval(value); });
case TCP_KEEPCNT:
return proc.Process<uint32_t>(
[this](uint32_t value) { return client()->SetTcpKeepAliveCount(value); });
case TCP_USER_TIMEOUT:
return proc.Process<uint32_t>(
[this](uint32_t value) { return client()->SetTcpUserTimeout(value); });
case TCP_CONGESTION:
return proc.Process<fsocket::wire::TcpCongestionControl>(
[this](fsocket::wire::TcpCongestionControl value) {
return client()->SetTcpCongestion(value);
});
case TCP_DEFER_ACCEPT:
return proc.Process<int32_t>([this](int32_t value) {
if (value < 0) {
value = 0;
}
return client()->SetTcpDeferAccept(value);
});
case TCP_SYNCNT:
return proc.Process<uint32_t>(
[this](uint32_t value) { return client()->SetTcpSynCount(value); });
case TCP_WINDOW_CLAMP:
return proc.Process<uint32_t>(
[this](uint32_t value) { return client()->SetTcpWindowClamp(value); });
case TCP_LINGER2:
return proc.Process<int32_t>([this](int32_t value) {
fsocket::wire::OptionalUint32 opt;
if (value < 0) {
opt = fsocket::wire::OptionalUint32::WithUnset({});
} else {
opt = fsocket::wire::OptionalUint32::WithValue(static_cast<uint32_t>(value));
}
return client()->SetTcpLinger(opt);
});
default:
return SockOptResult::Errno(ENOPROTOOPT);
}
} else {
__FALLTHROUGH;
}
default:
return SockOptResult::Errno(EPROTONOSUPPORT);
}
}
zx_status_t shutdown(int how, int16_t* out_code) {
using fsocket::wire::ShutdownMode;
ShutdownMode mode;
switch (how) {
case SHUT_RD:
mode = ShutdownMode::kRead;
break;
case SHUT_WR:
mode = ShutdownMode::kWrite;
break;
case SHUT_RDWR:
mode = ShutdownMode::kRead | ShutdownMode::kWrite;
break;
default:
return ZX_ERR_INVALID_ARGS;
}
auto response = client()->Shutdown(mode);
zx_status_t status = response.status();
if (status != ZX_OK) {
return status;
}
auto const& result = response.value();
if (result.is_error()) {
*out_code = static_cast<int16_t>(result.error_value());
return ZX_OK;
}
*out_code = 0;
return ZX_OK;
}
};
// Prevent divergence in flag bitmasks between libc and fuchsia.posix.socket FIDL library.
static_assert(static_cast<uint16_t>(fsocket::wire::InterfaceFlags::kUp) == IFF_UP);
static_assert(static_cast<uint16_t>(fsocket::wire::InterfaceFlags::kBroadcast) == IFF_BROADCAST);
static_assert(static_cast<uint16_t>(fsocket::wire::InterfaceFlags::kDebug) == IFF_DEBUG);
static_assert(static_cast<uint16_t>(fsocket::wire::InterfaceFlags::kLoopback) == IFF_LOOPBACK);
static_assert(static_cast<uint16_t>(fsocket::wire::InterfaceFlags::kPointtopoint) ==
IFF_POINTOPOINT);
static_assert(static_cast<uint16_t>(fsocket::wire::InterfaceFlags::kNotrailers) == IFF_NOTRAILERS);
static_assert(static_cast<uint16_t>(fsocket::wire::InterfaceFlags::kRunning) == IFF_RUNNING);
static_assert(static_cast<uint16_t>(fsocket::wire::InterfaceFlags::kNoarp) == IFF_NOARP);
static_assert(static_cast<uint16_t>(fsocket::wire::InterfaceFlags::kPromisc) == IFF_PROMISC);
static_assert(static_cast<uint16_t>(fsocket::wire::InterfaceFlags::kAllmulti) == IFF_ALLMULTI);
static_assert(static_cast<uint16_t>(fsocket::wire::InterfaceFlags::kLeader) == IFF_MASTER);
static_assert(static_cast<uint16_t>(fsocket::wire::InterfaceFlags::kFollower) == IFF_SLAVE);
static_assert(static_cast<uint16_t>(fsocket::wire::InterfaceFlags::kMulticast) == IFF_MULTICAST);
static_assert(static_cast<uint16_t>(fsocket::wire::InterfaceFlags::kPortsel) == IFF_PORTSEL);
static_assert(static_cast<uint16_t>(fsocket::wire::InterfaceFlags::kAutomedia) == IFF_AUTOMEDIA);
static_assert(static_cast<uint16_t>(fsocket::wire::InterfaceFlags::kDynamic) == IFF_DYNAMIC);
} // namespace
namespace fdio_internal {
struct SynchronousDatagramSocket;
struct RawSocket;
struct PacketSocket;
struct StreamSocket;
template <typename T,
typename = std::enable_if_t<
std::is_same_v<T, SynchronousDatagramSocket> || std::is_same_v<T, RawSocket> ||
std::is_same_v<T, PacketSocket> || std::is_same_v<T, StreamSocket>>>
struct base_socket : public zxio {
Errno posix_ioctl(int req, va_list va) final {
switch (req) {
case SIOCGIFNAME: {
auto& provider = get_client<fsocket::Provider>();
if (provider.is_error()) {
return Errno(fdio_status_to_errno(provider.error_value()));
}
struct ifreq* ifr = va_arg(va, struct ifreq*);
auto response = provider->InterfaceIndexToName(static_cast<uint64_t>(ifr->ifr_ifindex));
zx_status_t status = response.status();
if (status != ZX_OK) {
return Errno(fdio_status_to_errno(status));
}
auto const& result = response.value();
if (result.is_error()) {
if (result.error_value() == ZX_ERR_NOT_FOUND) {
return Errno(ENODEV);
}
return Errno(fdio_status_to_errno(result.error_value()));
}
auto const& if_name = result.value()->name;
const size_t len = std::min(if_name.size(), std::size(ifr->ifr_name));
auto it = std::copy_n(if_name.begin(), len, std::begin(ifr->ifr_name));
if (it != std::end(ifr->ifr_name)) {
*it = 0;
}
return Errno(Errno::Ok);
}
case SIOCGIFINDEX: {
auto& provider = get_client<fsocket::Provider>();
if (provider.is_error()) {
return Errno(fdio_status_to_errno(provider.error_value()));
}
struct ifreq* ifr = va_arg(va, struct ifreq*);
fidl::StringView name(ifr->ifr_name, strnlen(ifr->ifr_name, sizeof(ifr->ifr_name) - 1));
auto response = provider->InterfaceNameToIndex(name);
zx_status_t status = response.status();
if (status != ZX_OK) {
if (status == ZX_ERR_INVALID_ARGS) {
// FIDL calls will return ZX_ERR_INVALID_ARGS if the passed string
// (`name` in this case) fails UTF-8 validation.
return Errno(ENODEV);
}
return Errno(fdio_status_to_errno(status));
}
auto const& result = response.value();
if (result.is_error()) {
if (result.error_value() == ZX_ERR_NOT_FOUND) {
return Errno(ENODEV);
}
return Errno(fdio_status_to_errno(result.error_value()));
}
ifr->ifr_ifindex = static_cast<int>(result.value()->index);
return Errno(Errno::Ok);
}
case SIOCGIFFLAGS: {
auto& provider = get_client<fsocket::Provider>();
if (provider.is_error()) {
return Errno(fdio_status_to_errno(provider.error_value()));
}
struct ifreq* ifr = va_arg(va, struct ifreq*);
fidl::StringView name(ifr->ifr_name, strnlen(ifr->ifr_name, sizeof(ifr->ifr_name) - 1));
auto response = provider->InterfaceNameToFlags(name);
zx_status_t status = response.status();
if (status != ZX_OK) {
if (status == ZX_ERR_INVALID_ARGS) {
// FIDL calls will return ZX_ERR_INVALID_ARGS if the passed string
// (`name` in this case) fails UTF-8 validation.
return Errno(ENODEV);
}
return Errno(fdio_status_to_errno(status));
}
auto const& result = response.value();
if (result.is_error()) {
if (result.error_value() == ZX_ERR_NOT_FOUND) {
return Errno(ENODEV);
}
return Errno(fdio_status_to_errno(result.error_value()));
}
ifr->ifr_flags =
static_cast<uint16_t>(result.value()->flags); // NOLINT(bugprone-narrowing-conversions)
return Errno(Errno::Ok);
}
case SIOCGIFCONF: {
struct ifconf* ifc_ptr = va_arg(va, struct ifconf*);
if (ifc_ptr == nullptr) {
return Errno(EFAULT);
}
struct ifconf& ifc = *ifc_ptr;
auto& provider = get_client<fsocket::Provider>();
if (provider.is_error()) {
return Errno(fdio_status_to_errno(provider.error_value()));
}
auto response = provider->GetInterfaceAddresses();
zx_status_t status = response.status();
if (status != ZX_OK) {
return Errno(fdio_status_to_errno(status));
}
const auto& interfaces = response.value().interfaces;
// If `ifc_req` is NULL, return the necessary buffer size in bytes for
// receiving all available addresses in `ifc_len`.
//
// This allows the caller to determine the necessary buffer size
// beforehand, and is the documented manual behavior.
// See: https://man7.org/linux/man-pages/man7/netdevice.7.html
if (ifc.ifc_req == nullptr) {
int len = 0;
for (const auto& iface : interfaces) {
for (const auto& address : iface.addresses()) {
if (address.addr.Which() == fnet::wire::IpAddress::Tag::kIpv4) {
len += sizeof(struct ifreq);
}
}
}
ifc.ifc_len = len;
return Errno(Errno::Ok);
}
struct ifreq* ifr = ifc.ifc_req;
const auto buffer_full = [&] {
return ifr + 1 > ifc.ifc_req + ifc.ifc_len / sizeof(struct ifreq);
};
for (const auto& iface : interfaces) {
// Don't write past the caller-allocated buffer.
// C++ doesn't support break labels, so we check this in both the inner
// and outer loops.
if (buffer_full()) {
break;
}
// This should not happen, and would indicate a protocol error with
// fuchsia.posix.socket/Provider.GetInterfaceAddresses.
if (!iface.has_name() || !iface.has_addresses()) {
continue;
}
const auto& if_name = iface.name();
for (const auto& address : iface.addresses()) {
// Don't write past the caller-allocated buffer.
if (buffer_full()) {
break;
}
// SIOCGIFCONF only returns interface addresses of the AF_INET (IPv4)
// family for compatibility; this is the behavior documented in the
// manual. See: https://man7.org/linux/man-pages/man7/netdevice.7.html
const auto& addr = address.addr;
if (addr.Which() != fnet::wire::IpAddress::Tag::kIpv4) {
continue;
}
// Write interface name.
const size_t len = std::min(if_name.size(), std::size(ifr->ifr_name));
auto it = std::copy_n(if_name.begin(), len, std::begin(ifr->ifr_name));
if (it != std::end(ifr->ifr_name)) {
*it = 0;
}
// Write interface address.
auto& s = *reinterpret_cast<struct sockaddr_in*>(&ifr->ifr_addr);
const auto& ipv4 = addr.ipv4();
s.sin_family = AF_INET;
s.sin_port = 0;
static_assert(sizeof(s.sin_addr) == sizeof(ipv4.addr));
memcpy(&s.sin_addr, ipv4.addr.data(), sizeof(ipv4.addr));
ifr++;
}
}
ifc.ifc_len = static_cast<int>((ifr - ifc.ifc_req) * sizeof(struct ifreq));
return Errno(Errno::Ok);
}
default:
return zxio::posix_ioctl(req, va);
}
}
protected:
virtual fidl::WireSyncClient<typename T::FidlProtocol>& GetClient() = 0;
};
void recvmsg_populate_socketaddress(const fnet::wire::SocketAddress& fidl, void* addr,
socklen_t& addr_len) {
// Result address has invalid tag when it's not provided by the server (when the address
// is not requested).
// TODO(https://fxbug.dev/58503): Use better representation of nullable union when available.
if (fidl.has_invalid_tag()) {
return;
}
addr_len = fidl_to_sockaddr(fidl, addr, addr_len);
}
struct StreamSocket {
using FidlProtocol = fsocket::StreamSocket;
};
struct SynchronousDatagramSocket {
using FidlProtocol = fsocket::SynchronousDatagramSocket;
using FidlSockAddr = SocketAddress;
using FidlSendControlData = fsocket::wire::DatagramSocketSendControlData;
using zxio_type = zxio_synchronous_datagram_socket_t;
static void recvmsg_populate_msgname(
const fsocket::wire::SynchronousDatagramSocketRecvMsgResponse& response, void* addr,
socklen_t& addr_len) {
recvmsg_populate_socketaddress(response.addr, addr, addr_len);
}
static void handle_sendmsg_response(
const fsocket::wire::SynchronousDatagramSocketSendMsgResponse& response,
ssize_t expected_len) {
// TODO(https://fxbug.dev/82346): Drop len from the response as SendMsg does
// does not perform partial writes.
ZX_DEBUG_ASSERT_MSG(response.len == expected_len, "got SendMsg(...) = %ld, want = %ld",
response.len, expected_len);
}
};
struct RawSocket {
using FidlProtocol = frawsocket::Socket;
using FidlSockAddr = SocketAddress;
using FidlSendControlData = fsocket::wire::NetworkSocketSendControlData;
using zxio_type = zxio_raw_socket_t;
static void recvmsg_populate_msgname(const frawsocket::wire::SocketRecvMsgResponse& response,
void* addr, socklen_t& addr_len) {
recvmsg_populate_socketaddress(response.addr, addr, addr_len);
}
static void handle_sendmsg_response(const frawsocket::wire::SocketSendMsgResponse& response,
ssize_t expected_len) {
// TODO(https://fxbug.dev/82346): Drop this method once DatagramSocket.SendMsg
// no longer returns a length field.
}
};
struct PacketSocket {
using FidlProtocol = fpacketsocket::Socket;
using FidlSockAddr = PacketInfo;
using FidlSendControlData = fpacketsocket::wire::SendControlData;
using zxio_type = zxio_packet_socket_t;
static void recvmsg_populate_msgname(const fpacketsocket::wire::SocketRecvMsgResponse& response,
void* addr, socklen_t& addr_len) {
fidl::ObjectView view = response.packet_info;
if (!view) {
// The packet info field is not provided by the server (when it is not requested).
return;
}
const fpacketsocket::wire::RecvPacketInfo& info = *view;
sockaddr_ll sll = {
.sll_family = AF_PACKET,
.sll_protocol = htons(info.packet_info.protocol),
.sll_ifindex = static_cast<int>(info.packet_info.interface_id),
.sll_hatype = fidl_hwtype_to_arphrd(info.interface_type),
.sll_pkttype = fidl_pkttype_to_pkttype(info.packet_type),
};
populate_from_fidl_hwaddr(info.packet_info.addr, sll);
memcpy(addr, &sll, std::min(sizeof(sll), static_cast<size_t>(addr_len)));
addr_len = sizeof(sll);
}
static void handle_sendmsg_response(const fpacketsocket::wire::SocketSendMsgResponse& response,
ssize_t expected_len) {
// TODO(https://fxbug.dev/82346): Drop this method once DatagramSocket.SendMsg
// no longer returns a length field.
}
};
template <typename R, typename = int>
struct FitxResultHasValue : std::false_type {};
template <typename R>
struct FitxResultHasValue<R, decltype(&R::value, 0)> : std::true_type {};
template <typename T, typename R>
typename std::enable_if<FitxResultHasValue<R>::value>::type HandleSendMsgResponse(const R& result,
size_t total) {
T::handle_sendmsg_response(*result->value(), total);
}
template <typename T, typename R>
typename std::enable_if<!FitxResultHasValue<T>::value>::type HandleSendMsgResponse(const R& result,
size_t total) {}
template <typename T, typename = std::enable_if_t<std::is_same_v<T, SynchronousDatagramSocket> ||
std::is_same_v<T, RawSocket> ||
std::is_same_v<T, PacketSocket>>>
// inheritance is virtual to avoid multiple copies of `base_socket<T>` when derived classes
// inherit from `socket_with_event` and `network_socket`.
struct socket_with_event : virtual public base_socket<T> {
static constexpr zx_signals_t kSignalIncoming = ZX_USER_SIGNAL_0;
static constexpr zx_signals_t kSignalOutgoing = ZX_USER_SIGNAL_1;
static constexpr zx_signals_t kSignalError = ZX_USER_SIGNAL_2;
static constexpr zx_signals_t kSignalShutdownRead = ZX_USER_SIGNAL_4;
static constexpr zx_signals_t kSignalShutdownWrite = ZX_USER_SIGNAL_5;
void wait_begin(uint32_t events, zx_handle_t* handle, zx_signals_t* out_signals) override {
*handle = zxio_socket_with_event().event.get();
zx_signals_t signals = ZX_EVENTPAIR_PEER_CLOSED | kSignalError;
if (events & POLLIN) {
signals |= kSignalIncoming | kSignalShutdownRead;
}
if (events & POLLOUT) {
signals |= kSignalOutgoing | kSignalShutdownWrite;
}
if (events & POLLRDHUP) {
signals |= kSignalShutdownRead;
}
*out_signals = signals;
}
void wait_end(zx_signals_t signals, uint32_t* out_events) override {
uint32_t events = 0;
if (signals & (ZX_EVENTPAIR_PEER_CLOSED | kSignalIncoming | kSignalShutdownRead)) {
events |= POLLIN;
}
if (signals & (ZX_EVENTPAIR_PEER_CLOSED | kSignalOutgoing | kSignalShutdownWrite)) {
events |= POLLOUT;
}
if (signals & (ZX_EVENTPAIR_PEER_CLOSED | kSignalError)) {
events |= POLLERR;
}
if (signals & (ZX_EVENTPAIR_PEER_CLOSED | kSignalShutdownRead)) {
events |= POLLRDHUP;
}
*out_events = events;
}
zx_status_t recvmsg(struct msghdr* msg, int flags, size_t* out_actual,
int16_t* out_code) override {
size_t datalen = 0;
for (int i = 0; i < msg->msg_iovlen; ++i) {
datalen += msg->msg_iov[i].iov_len;
}
bool want_addr = msg->msg_namelen != 0 && msg->msg_name != nullptr;
bool want_cmsg = msg->msg_controllen != 0 && msg->msg_control != nullptr;
auto response = GetClient()->RecvMsg(want_addr, static_cast<uint32_t>(datalen), want_cmsg,
to_recvmsg_flags(flags));
zx_status_t status = response.status();
if (status != ZX_OK) {
return status;
}
auto const& result = response.value();
if (result.is_error()) {
*out_code = static_cast<int16_t>(result.error_value());
return ZX_OK;
}
*out_code = 0;
T::recvmsg_populate_msgname(*result.value(), msg->msg_name, msg->msg_namelen);
{
auto const& out = result.value()->data;
const uint8_t* data = out.begin();
size_t remaining = out.count();
for (int i = 0; remaining != 0 && i < msg->msg_iovlen; ++i) {
iovec const& iov = msg->msg_iov[i];
if (iov.iov_base != nullptr) {
size_t actual = std::min(iov.iov_len, remaining);
memcpy(iov.iov_base, data, actual);
data += actual;
remaining -= actual;
} else if (iov.iov_len != 0) {
*out_code = EFAULT;
return ZX_OK;
}
}
if (result.value()->truncated != 0) {
msg->msg_flags |= MSG_TRUNC;
} else {
msg->msg_flags &= ~MSG_TRUNC;
}
size_t actual = out.count() - remaining;
if ((flags & MSG_TRUNC) != 0) {
actual += result.value()->truncated;
}
*out_actual = actual;
}
if (want_cmsg) {
FidlControlDataProcessor proc(msg->msg_control, msg->msg_controllen);
msg->msg_controllen = proc.Store(result.value()->control);
} else {
msg->msg_controllen = 0;
}
return ZX_OK;
}
zx_status_t sendmsg(const struct msghdr* msg, int flags, size_t* out_actual,
int16_t* out_code) override {
typename T::FidlSockAddr addr;
// Attempt to load socket address if either name or namelen is set.
// If only one is set, it'll result in INVALID_ARGS.
if (msg->msg_namelen != 0 || msg->msg_name != nullptr) {
zx_status_t status =
addr.LoadSockAddr(static_cast<struct sockaddr*>(msg->msg_name), msg->msg_namelen);
if (status != ZX_OK) {
return status;
}
}
size_t total = 0;
for (int i = 0; i < msg->msg_iovlen; ++i) {
iovec const& iov = msg->msg_iov[i];
if (iov.iov_base == nullptr && iov.iov_len != 0) {
*out_code = EFAULT;
return ZX_OK;
}
total += iov.iov_len;
}
fidl::Arena allocator;
fitx::result cmsg_result = ParseControlMessages<typename T::FidlSendControlData>(
msg->msg_control, msg->msg_controllen, allocator);
if (cmsg_result.is_error()) {
*out_code = cmsg_result.error_value();
return ZX_OK;
}
const typename T::FidlSendControlData& cdata = cmsg_result.value();
std::vector<uint8_t> data;
auto vec = fidl::VectorView<uint8_t>();
switch (msg->msg_iovlen) {
case 0: {
break;
}
case 1: {
iovec const& iov = *msg->msg_iov;
vec = fidl::VectorView<uint8_t>::FromExternal(static_cast<uint8_t*>(iov.iov_base),
iov.iov_len);
break;
}
default: {
// TODO(https://fxbug.dev/67928): avoid this copy.
data.reserve(total);
for (int i = 0; i < msg->msg_iovlen; ++i) {
iovec const& iov = msg->msg_iov[i];
std::copy_n(static_cast<const uint8_t*>(iov.iov_base), iov.iov_len,
std::back_inserter(data));
}
vec = fidl::VectorView<uint8_t>::FromExternal(data);
}
}
// TODO(https://fxbug.dev/58503): Use better representation of nullable union when
// available. Currently just using a default-initialized union with an invalid tag.
auto response = addr.WithFIDL([&](auto address) {
return GetClient()->SendMsg(address, vec, cdata, to_sendmsg_flags(flags));
});
zx_status_t status = response.status();
if (status != ZX_OK) {
return status;
}
auto const& result = response.value();
if (result.is_error()) {
*out_code = static_cast<int16_t>(result.error_value());
return ZX_OK;
}
HandleSendMsgResponse<T, decltype(result)>(result, total);
*out_code = 0;
// SendMsg does not perform partial writes.
*out_actual = total;
return ZX_OK;
}
protected:
friend class fbl::internal::MakeRefCountedHelper<socket_with_event<T>>;
friend class fbl::RefPtr<socket_with_event<T>>;
socket_with_event<T>() = default;
~socket_with_event<T>() override = default;
fidl::WireSyncClient<typename T::FidlProtocol>& GetClient() override {
return zxio_socket_with_event().client;
}
typename T::zxio_type& zxio_socket_with_event() {
return *reinterpret_cast<typename T::zxio_type*>(&base_socket<T>::zxio_storage().io);
}
};
template <typename T, typename = std::enable_if_t<std::is_same_v<T, SynchronousDatagramSocket> ||
std::is_same_v<T, StreamSocket> ||
std::is_same_v<T, RawSocket>>>
// inheritance is virtual to avoid multiple copies of `base_socket<T>` when derived classes
// inherit from `network_socket` and `socket_with_event`.
struct network_socket : virtual public base_socket<T> {
using base_socket<T>::GetClient;
zx_status_t bind(const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) override {
return BaseNetworkSocket(GetClient()).bind(addr, addrlen, out_code);
}
zx_status_t connect(const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) override {
return BaseNetworkSocket(GetClient()).connect(addr, addrlen, out_code);
}
zx_status_t getsockname(struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) override {
return BaseNetworkSocket(GetClient()).getsockname(addr, addrlen, out_code);
}
zx_status_t getpeername(struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) override {
return BaseNetworkSocket(GetClient()).getpeername(addr, addrlen, out_code);
}
zx_status_t getsockopt(int level, int optname, void* optval, socklen_t* optlen,
int16_t* out_code) override {
SockOptResult result =
BaseNetworkSocket(GetClient()).getsockopt_fidl(level, optname, optval, optlen);
*out_code = result.err;
return result.status;
}
zx_status_t setsockopt(int level, int optname, const void* optval, socklen_t optlen,
int16_t* out_code) override {
SockOptResult result =
BaseNetworkSocket(GetClient()).setsockopt_fidl(level, optname, optval, optlen);
*out_code = result.err;
return result.status;
}
zx_status_t shutdown(int how, int16_t* out_code) override {
return BaseNetworkSocket(GetClient()).shutdown(how, out_code);
}
};
template <>
zx_status_t network_socket<RawSocket>::getsockopt(int level, int optname, void* optval,
socklen_t* optlen, int16_t* out_code) {
SockOptResult result = [&]() {
GetSockOptProcessor proc(optval, optlen);
switch (level) {
case SOL_ICMPV6:
switch (optname) {
case ICMP6_FILTER:
return proc.Process(GetClient()->GetIcmpv6Filter(),
[](const auto& response) { return response.filter; });
}
break;
case SOL_IPV6:
switch (optname) {
case IPV6_CHECKSUM:
return proc.Process(GetClient()->GetIpv6Checksum(), [](const auto& response) {
switch (response.config.Which()) {
case frawsocket::wire::Ipv6ChecksumConfiguration::Tag::kDisabled:
return -1;
case frawsocket::wire::Ipv6ChecksumConfiguration::Tag::kOffset:
return response.config.offset();
};
});
}
break;
case SOL_IP:
switch (optname) {
case IP_HDRINCL:
return proc.Process(GetClient()->GetIpHeaderIncluded(),
[](const auto& response) { return response.value; });
}
break;
}
return BaseNetworkSocket(GetClient()).getsockopt_fidl(level, optname, optval, optlen);
}();
*out_code = result.err;
return result.status;
}
template <>
zx_status_t network_socket<RawSocket>::setsockopt(int level, int optname, const void* optval,
socklen_t optlen, int16_t* out_code) {
SockOptResult result = [&]() {
SetSockOptProcessor proc(optval, optlen);
switch (level) {
case SOL_ICMPV6:
switch (optname) {
case ICMP6_FILTER:
return proc.Process<frawsocket::wire::Icmpv6Filter>(
[this](frawsocket::wire::Icmpv6Filter value) {
return GetClient()->SetIcmpv6Filter(value);
});
}
break;
case SOL_IPV6:
switch (optname) {
case IPV6_CHECKSUM:
return proc.Process<int32_t>([this](int32_t value) {
frawsocket::wire::Ipv6ChecksumConfiguration config;
if (value < 0) {
config = frawsocket::wire::Ipv6ChecksumConfiguration::WithDisabled(
frawsocket::wire::Empty{});
} else {
config = frawsocket::wire::Ipv6ChecksumConfiguration::WithOffset(value);
}
return GetClient()->SetIpv6Checksum(config);
});
}
break;
case SOL_IP:
switch (optname) {
case IP_HDRINCL:
return proc.Process<bool>(
[this](bool value) { return GetClient()->SetIpHeaderIncluded(value); });
}
break;
}
return BaseNetworkSocket(GetClient()).setsockopt_fidl(level, optname, optval, optlen);
}();
*out_code = result.err;
return result.status;
}
template <typename T, typename = std::enable_if_t<std::is_same_v<T, SynchronousDatagramSocket> ||
std::is_same_v<T, RawSocket>>>
struct network_socket_with_event : public socket_with_event<T>, public network_socket<T> {
protected:
friend class fbl::internal::MakeRefCountedHelper<network_socket_with_event<T>>;
friend class fbl::RefPtr<network_socket_with_event<T>>;
network_socket_with_event<T>() = default;
~network_socket_with_event<T>() override = default;
};
using synchronous_datagram_socket = network_socket_with_event<SynchronousDatagramSocket>;
using raw_socket = network_socket_with_event<RawSocket>;
} // namespace fdio_internal
zx::status<fdio_ptr> fdio_synchronous_datagram_socket_create(
zx::eventpair event, fidl::ClientEnd<fsocket::SynchronousDatagramSocket> client) {
fdio_ptr io = fbl::MakeRefCounted<fdio_internal::synchronous_datagram_socket>();
if (io == nullptr) {
return zx::error(ZX_ERR_NO_MEMORY);
}
zx_status_t status = zxio::CreateSynchronousDatagramSocket(&io->zxio_storage(), std::move(event),
std::move(client));
if (status != ZX_OK) {
return zx::error(status);
}
return zx::ok(io);
}
zx::status<fdio_ptr> fdio_raw_socket_create(zx::eventpair event,
fidl::ClientEnd<frawsocket::Socket> client) {
fdio_ptr io = fbl::MakeRefCounted<fdio_internal::raw_socket>();
if (io == nullptr) {
return zx::error(ZX_ERR_NO_MEMORY);
}
zx_status_t status =
zxio::CreateRawSocket(&io->zxio_storage(), std::move(event), std::move(client));
if (status != ZX_OK) {
return zx::error(status);
}
return zx::ok(io);
}
static zxio_stream_socket_t& zxio_stream_socket(zxio_t* io) {
return *reinterpret_cast<zxio_stream_socket_t*>(io);
}
namespace fdio_internal {
struct stream_socket : public network_socket<StreamSocket> {
static constexpr zx_signals_t kSignalIncoming = ZX_USER_SIGNAL_0;
static constexpr zx_signals_t kSignalConnected = ZX_USER_SIGNAL_3;
enum class State {
kUnconnected,
kListening,
kConnecting,
kConnected,
};
void wait_begin(uint32_t events, zx_handle_t* handle, zx_signals_t* out_signals) override {
zxio_signals_t signals = ZXIO_SIGNAL_PEER_CLOSED;
auto [state, has_error] = GetState();
switch (state) {
case State::kUnconnected:
// Stream sockets which are non-listening or unconnected do not have a potential peer
// to generate any waitable signals, skip signal waiting and notify the caller of the
// same.
*out_signals = ZX_SIGNAL_NONE;
return;
case State::kListening:
break;
case State::kConnecting:
if (events & POLLIN) {
signals |= ZXIO_SIGNAL_READABLE;
}
break;
case State::kConnected:
wait_begin_inner(events, signals, handle, out_signals);
return;
}
if (events & POLLOUT) {
signals |= ZXIO_SIGNAL_WRITE_DISABLED;
}
if (events & (POLLIN | POLLRDHUP)) {
signals |= ZXIO_SIGNAL_READ_DISABLED;
}
zx_signals_t zx_signals = ZX_SIGNAL_NONE;
zxio_wait_begin(&zxio_storage().io, signals, handle, &zx_signals);
if (events & POLLOUT) {
// signal when connect() operation is finished.
zx_signals |= kSignalConnected;
}
if (events & POLLIN) {
// signal when a listening socket gets an incoming connection.
zx_signals |= kSignalIncoming;
}
*out_signals = zx_signals;
}
void wait_end(zx_signals_t zx_signals, uint32_t* out_events) override {
zxio_signals_t signals = ZXIO_SIGNAL_NONE;
uint32_t events = 0;
bool use_inner;
{
std::lock_guard lock(state_lock_);
auto [state, has_error] = StateLocked();
switch (state) {
case State::kUnconnected:
ZX_ASSERT_MSG(zx_signals == ZX_SIGNAL_NONE, "zx_signals=%s on unconnected socket",
std::bitset<sizeof(zx_signals)>(zx_signals).to_string().c_str());
*out_events = POLLOUT | POLLHUP;
return;
case State::kListening:
if (zx_signals & kSignalIncoming) {
events |= POLLIN;
}
use_inner = false;
break;
case State::kConnecting:
if (zx_signals & kSignalConnected) {
state_ = State::kConnected;
events |= POLLOUT;
}
zx_signals &= ~kSignalConnected;
use_inner = false;
break;
case State::kConnected:
use_inner = true;
break;
}
}
if (use_inner) {
wait_end_inner(zx_signals, &events, &signals);
} else {
zxio_wait_end(&zxio_storage().io, zx_signals, &signals);
}
if (signals & ZXIO_SIGNAL_PEER_CLOSED) {
events |= POLLIN | POLLOUT | POLLERR | POLLHUP | POLLRDHUP;
}
if (signals & ZXIO_SIGNAL_WRITE_DISABLED) {
events |= POLLHUP | POLLOUT;
}
if (signals & ZXIO_SIGNAL_READ_DISABLED) {
events |= POLLRDHUP | POLLIN;
}
*out_events = events;
}
zx_status_t connect(const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) override {
zx_status_t status = network_socket::connect(addr, addrlen, out_code);
if (status == ZX_OK) {
std::lock_guard lock(state_lock_);
switch (*out_code) {
case 0:
state_ = State::kConnected;
break;
case EINPROGRESS:
state_ = State::kConnecting;
break;
}
}
return status;
}
zx_status_t listen(int backlog, int16_t* out_code) override {
auto response = GetClient()->Listen(safemath::saturated_cast<int16_t>(backlog));
zx_status_t status = response.status();
if (status != ZX_OK) {
return status;
}
auto const& result = response.value();
if (result.is_error()) {
*out_code = static_cast<int16_t>(result.error_value());
return ZX_OK;
}
{
std::lock_guard lock(state_lock_);
state_ = State::kListening;
}
*out_code = 0;
return ZX_OK;
}
zx_status_t accept(int flags, struct sockaddr* addr, socklen_t* addrlen, zx_handle_t* out_handle,
int16_t* out_code) override {
bool want_addr = addr != nullptr && addrlen != nullptr;
auto response = GetClient()->Accept(want_addr);
zx_status_t status = response.status();
if (status != ZX_OK) {
return status;
}
const auto& result = response.value();
if (result.is_error()) {
*out_code = static_cast<int16_t>(result.error_value());
return ZX_OK;
}
*out_code = 0;
*out_handle = result.value()->s.channel().release();
auto const& out = result.value()->addr;
// Result address has invalid tag when it's not provided by the server (when want_addr
// is false).
// TODO(https://fxbug.dev/58503): Use better representation of nullable union when available.
if (want_addr && !out.has_invalid_tag()) {
*addrlen = static_cast<socklen_t>(fidl_to_sockaddr(out, addr, *addrlen));
}
return ZX_OK;
}
zx_status_t recvmsg(struct msghdr* msg, int flags, size_t* out_actual,
int16_t* out_code) override {
zx::status preflight = Preflight(ENOTCONN);
if (preflight.is_error()) {
return preflight.status_value();
}
if (std::optional err = preflight.value(); err.has_value()) {
*out_code = static_cast<uint16_t>(err.value());
return ZX_OK;
}
zx_status_t status = recvmsg_inner(msg, flags, out_actual);
switch (status) {
case ZX_ERR_INVALID_ARGS:
*out_code = EFAULT;
return ZX_OK;
case ZX_ERR_BAD_STATE:
__FALLTHROUGH;
case ZX_ERR_PEER_CLOSED: {
zx::status err = GetError();
if (err.is_error()) {
return err.status_value();
}
*out_actual = 0;
*out_code = static_cast<uint16_t>(err.value());
return ZX_OK;
}
default:
*out_code = 0;
return status;
}
}
zx_status_t sendmsg(const struct msghdr* msg, int flags, size_t* out_actual,
int16_t* out_code) override {
zx::status preflight = Preflight(EPIPE);
if (preflight.is_error()) {
return preflight.status_value();
}
if (std::optional err = preflight.value(); err.has_value()) {
*out_code = static_cast<uint16_t>(err.value());
return ZX_OK;
}
// Fuchsia does not support control messages on stream sockets. But we still parse the buffer
// to check that it is valid.
fidl::Arena allocator;
fitx::result cmsg_result = ParseControlMessages<fsocket::wire::SocketSendControlData>(
msg->msg_control, msg->msg_controllen, allocator);
if (cmsg_result.is_error()) {
*out_code = cmsg_result.error_value();
return ZX_OK;
}
zx_status_t status = sendmsg_inner(msg, flags, out_actual);
switch (status) {
case ZX_ERR_INVALID_ARGS:
*out_code = EFAULT;
return ZX_OK;
case ZX_ERR_BAD_STATE:
__FALLTHROUGH;
case ZX_ERR_PEER_CLOSED: {
zx::status err = GetError();
if (err.is_error()) {
return err.status_value();
}
if (int32_t value = err.value(); value != 0) {
*out_code = static_cast<uint16_t>(value);
return ZX_OK;
}
// Error was consumed.
*out_code = EPIPE;
return ZX_OK;
}
default:
*out_code = 0;
return status;
}
}
private:
zxio_stream_socket_t& zxio_stream_socket() { return ::zxio_stream_socket(&zxio_storage().io); }
zx::status<std::optional<int32_t>> Preflight(int fallback) {
auto [state, has_error] = GetState();
if (has_error) {
zx::status err = GetError();
if (err.is_error()) {
return err.take_error();
}
if (int32_t value = err.value(); value != 0) {
return zx::ok(value);
}
// Error was consumed.
}
switch (state) {
case State::kUnconnected:
__FALLTHROUGH;
case State::kListening:
return zx::ok(fallback);
case State::kConnecting:
if (!has_error) {
return zx::ok(EAGAIN);
}
// There's an error on the socket, we will discover it when we perform our I/O.
__FALLTHROUGH;
case State::kConnected:
return zx::ok(std::nullopt);
}
}
zx::status<int32_t> GetError() {
fidl::WireResult response = GetClient()->GetError();
if (!response.ok()) {
return zx::error(response.status());
}
const auto& result = response.value();
if (result.is_error()) {
return zx::ok(static_cast<int32_t>(result.error_value()));
}
return zx::ok(0);
}
fidl::WireSyncClient<fsocket::StreamSocket>& GetClient() override {
return zxio_stream_socket().client;
}
std::mutex state_lock_;
State state_ __TA_GUARDED(state_lock_);
std::pair<State, bool> StateLocked() __TA_REQUIRES(state_lock_) {
switch (state_) {
case State::kUnconnected:
__FALLTHROUGH;
case State::kListening:
return std::make_pair(state_, false);
case State::kConnecting: {
zx_signals_t observed;
zx_status_t status = zxio_stream_socket().pipe.socket.wait_one(
kSignalConnected, zx::time::infinite_past(), &observed);
switch (status) {
case ZX_OK:
if (observed & kSignalConnected) {
state_ = State::kConnected;
}
__FALLTHROUGH;
case ZX_ERR_TIMED_OUT:
return std::make_pair(state_, observed & ZX_SOCKET_PEER_CLOSED);
default:
ZX_PANIC("ASSERT FAILED at (%s:%d): status=%s\n", __FILE__, __LINE__,
zx_status_get_string(status));
}
break;
}
case State::kConnected:
return std::make_pair(state_, false);
}
}
std::pair<State, bool> GetState() __TA_EXCLUDES(state_lock_) {
std::lock_guard lock(state_lock_);
return StateLocked();
}
protected:
friend class fbl::internal::MakeRefCountedHelper<stream_socket>;
friend class fbl::RefPtr<stream_socket>;
explicit stream_socket(State state) : state_(state) {}
~stream_socket() override = default;
};
} // namespace fdio_internal
zx::status<fdio_ptr> fdio_stream_socket_create(zx::socket socket,
fidl::ClientEnd<fsocket::StreamSocket> client) {
zx_info_socket_t info;
if (zx_status_t status = socket.get_info(ZX_INFO_SOCKET, &info, sizeof(info), nullptr, nullptr);
status != ZX_OK) {
return zx::error(status);
}
zx::status state = [&socket]() -> zx::status<fdio_internal::stream_socket::State> {
zx_status_t status = socket.wait_one(fdio_internal::stream_socket::kSignalConnected,
zx::time::infinite_past(), nullptr);
// TODO(tamird): Transferring a listening or connecting socket to another process doesn't work
// correctly since those states can't be observed here.
switch (status) {
case ZX_OK:
return zx::ok(fdio_internal::stream_socket::State::kConnected);
case ZX_ERR_TIMED_OUT:
return zx::ok(fdio_internal::stream_socket::State::kUnconnected);
default:
return zx::error(status);
}
}();
if (state.is_error()) {
return state.take_error();
}
fdio_ptr io = fbl::MakeRefCounted<fdio_internal::stream_socket>(state.value());
if (io == nullptr) {
return zx::error(ZX_ERR_NO_MEMORY);
}
zx_status_t status =
zxio::CreateStreamSocket(&io->zxio_storage(), std::move(socket), std::move(client), info);
if (status != ZX_OK) {
return zx::error(status);
}
return zx::ok(io);
}
namespace fdio_internal {
struct packet_socket : public socket_with_event<PacketSocket> {
zx_status_t bind(const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) override {
if (addr == nullptr || addrlen < sizeof(sockaddr_ll)) {
return ZX_ERR_INVALID_ARGS;
}
const sockaddr_ll& sll = *reinterpret_cast<const sockaddr_ll*>(addr);
fpacketsocket::wire::ProtocolAssociation proto_assoc;
uint16_t protocol = ntohs(sll.sll_protocol);
switch (protocol) {
case 0:
// protocol association is optional.
break;
case ETH_P_ALL:
proto_assoc =
fpacketsocket::wire::ProtocolAssociation::WithAll(fpacketsocket::wire::Empty());
break;
default:
proto_assoc = fpacketsocket::wire::ProtocolAssociation::WithSpecified(protocol);
break;
}
fpacketsocket::wire::BoundInterfaceId interface_id;
uint64_t ifindex = sll.sll_ifindex;
if (ifindex == 0) {
interface_id = fpacketsocket::wire::BoundInterfaceId::WithAll(fpacketsocket::wire::Empty());
} else {
interface_id = fpacketsocket::wire::BoundInterfaceId::WithSpecified(
fidl::ObjectView<uint64_t>::FromExternal(&ifindex));
}
const fidl::WireResult response = GetClient()->Bind(proto_assoc, interface_id);
zx_status_t status = response.status();
if (status != ZX_OK) {
return status;
}
const auto& result = response.value();
if (result.is_error()) {
*out_code = static_cast<int16_t>(result.error_value());
return ZX_OK;
}
*out_code = 0;
return ZX_OK;
}
zx_status_t connect(const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) override {
return ZX_ERR_WRONG_TYPE;
}
zx_status_t getsockname(struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) override {
if (addrlen == nullptr || (*addrlen != 0 && addr == nullptr)) {
*out_code = EFAULT;
return ZX_OK;
}
const fidl::WireResult response = GetClient()->GetInfo();
zx_status_t status = response.status();
if (status != ZX_OK) {
return status;
}
const auto& result = response.value();
if (result.is_error()) {
*out_code = static_cast<int16_t>(result.error_value());
return ZX_OK;
}
*out_code = 0;
const fpacketsocket::wire::SocketGetInfoResponse& info = *result.value();
sockaddr_ll sll = {
.sll_family = AF_PACKET,
.sll_protocol = htons(fidl_protoassoc_to_protocol(info.protocol)),
};
switch (info.bound_interface.Which()) {
case fpacketsocket::wire::BoundInterface::Tag::kAll:
sll.sll_ifindex = 0;
sll.sll_halen = 0;
sll.sll_hatype = 0;
break;
case fpacketsocket::wire::BoundInterface::Tag::kSpecified: {
const fpacketsocket::wire::InterfaceProperties& props = info.bound_interface.specified();
sll.sll_ifindex = static_cast<int>(props.id);
sll.sll_hatype = fidl_hwtype_to_arphrd(props.type);
populate_from_fidl_hwaddr(props.addr, sll);
} break;
}
socklen_t used_bytes = offsetof(sockaddr_ll, sll_addr) + sll.sll_halen;
memcpy(addr, &sll, std::min(used_bytes, *addrlen));
*addrlen = used_bytes;
return ZX_OK;
}
zx_status_t getpeername(struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) override {
return ZX_ERR_WRONG_TYPE;
}
SockOptResult getsockopt_fidl(int level, int optname, void* optval, socklen_t* optlen) {
switch (level) {
case SOL_SOCKET:
return BaseSocket(GetClient()).get_solsocket_sockopt_fidl(optname, optval, optlen);
default:
return SockOptResult::Errno(EPROTONOSUPPORT);
}
}
zx_status_t getsockopt(int level, int optname, void* optval, socklen_t* optlen,
int16_t* out_code) override {
SockOptResult result = getsockopt_fidl(level, optname, optval, optlen);
*out_code = result.err;
return result.status;
}
SockOptResult setsockopt_fidl(int level, int optname, const void* optval, socklen_t optlen) {
switch (level) {
case SOL_SOCKET:
return BaseSocket(GetClient()).set_solsocket_sockopt_fidl(optname, optval, optlen);
default:
return SockOptResult::Errno(EPROTONOSUPPORT);
}
}
zx_status_t setsockopt(int level, int optname, const void* optval, socklen_t optlen,
int16_t* out_code) override {
SockOptResult result = setsockopt_fidl(level, optname, optval, optlen);
*out_code = result.err;
return result.status;
}
zx_status_t shutdown(int how, int16_t* out_code) override { return ZX_ERR_NOT_SUPPORTED; }
protected:
friend class fbl::internal::MakeRefCountedHelper<packet_socket>;
friend class fbl::RefPtr<packet_socket>;
packet_socket() = default;
~packet_socket() override = default;
};
} // namespace fdio_internal
zx::status<fdio_ptr> fdio_packet_socket_create(zx::eventpair event,
fidl::ClientEnd<fpacketsocket::Socket> client) {
fdio_ptr io = fbl::MakeRefCounted<fdio_internal::packet_socket>();
if (io == nullptr) {
return zx::error(ZX_ERR_NO_MEMORY);
}
zx_status_t status =
zxio::CreatePacketSocket(&io->zxio_storage(), std::move(event), std::move(client));
if (status != ZX_OK) {
return zx::error(status);
}
return zx::ok(io);
}