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fuchsia / fuchsia / 335be9e7610ad8621f9b3a6081875a8fab4a53ba / . / sdk / lib / zxio / socket.cc
blob: 9c8f2c2b6ab711c122e82cb957b6048f3db6cd4b [file] [log] [blame]
// Copyright 2021 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 <fidl/fuchsia.posix.socket.packet/cpp/wire.h>
#include <fidl/fuchsia.posix.socket/cpp/wire.h>
#include <lib/fidl/cpp/wire/channel.h>
#include <lib/fidl/cpp/wire/connect_service.h>
#include <lib/fidl/cpp/wire/string_view.h>
#include <lib/fit/result.h>
#include <lib/zx/socket.h>
#include <lib/zxio/bsdsocket.h>
#include <lib/zxio/cpp/transitional.h>
#include <lib/zxio/cpp/udp_socket_private.h>
#include <lib/zxio/fault_catcher.h>
#include <lib/zxio/null.h>
#include <netinet/icmp6.h>
#include <netinet/if_ether.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <poll.h>
#include <zircon/availability.h>
#include <zircon/compiler.h>
#include <zircon/types.h>
#include <algorithm>
#include <cstring>
#include <type_traits>
#include <fbl/unaligned.h>
#include <safemath/safe_conversions.h>
#include "sdk/lib/zxio/dgram_cache.h"
#include "sdk/lib/zxio/private.h"
#include "sdk/lib/zxio/socket_address.h"
#include "sdk/lib/zxio/vector.h"
#include "src/connectivity/network/netstack/udp_serde/udp_serde.h"
namespace fio = fuchsia_io;
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 used to template socket_with_event.
*
* +-------------------------+ +---------------------+ +-------------------------------------+
* | struct PacketSocket | | struct RawSocket | | struct SynchronousDatagramSocket |
* | fpacketsocket::Socket | | frawsocket:Socket | | fsocket:SynchronousDatagramSocket |
* +-------------------------+ +---------------------+ +-------------------------------------+
*
* Socket class helpers for common socket operations.
*
* +------------------------------------+
* | socket_with_event |
* | |
* | Used by: |
* | PacketSocket::Storage |
* | RawSocket::Storage |
* | SynchronousDatagramSocket::Storage |
* | |
* | Implements: |
* | Overrides for sockets using FIDL |
* | over channel as a data plane. |
* +------------------------------------+
*
* +------------------------------------+ +----------------------+ +------------------------+
* | network_socket | | stream_socket | | datagram_socket |
* | | | | | |
* | Used by: | | Used by: | | Used by: |
* | zxio_datagram_socket_t | | zxio_stream_socket_t | | zxio_datagram_socket_t |
* | zxio_stream_socket_t | | | | |
* | RawSocket::Storage | | Implements: | | Implements: |
* | SynchronousDatagramSocket::Storage | | Overrides for | | Overrides for |
* | | | SOCK_STREAM | | SOCK_DGRAM |
* | Implements: | | sockets using | | sockets using |
* | Overrides for network layer | | a zx::socket | | a zx::socket |
* | sockets. | | data plane. | | data plane. |
* +-----------+------------------------+ +---------+------------+ +------------+-----------+
* | | |
* | +-----------+---------------+
* | |
* +-----------+------------+ +-----------+-------------+
* | base_socket | | socket_with_zx_socket |
* | | | |
* | Used by: All | | Implements: |
* | | | Overrides for |
* | Implements: | | sockets using a |
* | Overrides for all | | zx::socket data plane |
* | socket types | +-------------------------+
* +------------------------+
*/
namespace {
uint16_t fidl_protoassoc_to_protocol(
const fidl::WireOptional<fpacketsocket::wire::ProtocolAssociation>& optional_protocol) {
// protocol is not provided by the server (when the socket is not associated).
if (!optional_protocol.has_value()) {
return 0;
}
const fpacketsocket::wire::ProtocolAssociation& protocol = optional_protocol.value();
switch (protocol.Which()) {
case fpacketsocket::wire::ProtocolAssociation::Tag::kAll:
return ETH_P_ALL;
case fpacketsocket::wire::ProtocolAssociation::Tag::kSpecified:
return protocol.specified();
}
}
socklen_t fidl_to_sockaddr(const fuchsia_net::wire::SocketAddress& fidl, void* addr,
socklen_t addr_len) {
switch (fidl.Which()) {
case fuchsia_net::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 fuchsia_net::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);
}
}
}
template <zxio_object_type_t kObjectType>
zx_status_t AttrGet(zxio_t* zxio, zxio_node_attributes_t* inout_attr) {
if (inout_attr->has.object_type) {
ZXIO_NODE_ATTR_SET(*inout_attr, object_type, kObjectType);
}
return ZX_OK;
}
// 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;
// An implicit constructor to simplify error handling. This should represent an errno.
SockOptResult(fit::error<int16_t> error)
: SockOptResult(ZX_OK, fit::result<int16_t>(error).error_value()) {}
SockOptResult(zx_status_t status, int16_t err) : status(status), err(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();
}
};
// A helper class that forbids direct access to `optval` and `optlen`.
template <typename OptVal, typename OptLen>
class OptValAndLen {
static_assert(std::is_pointer_v<OptVal>);
static_assert(std::is_same_v<std::remove_pointer_t<OptLen>, socklen_t>);
static_assert(std::is_same_v<std::remove_const_t<std::remove_pointer_t<OptVal>>, void>);
protected:
OptValAndLen(OptVal optval, OptLen optlen) : optval_(optval), optlen_(optlen) {}
fit::result<int16_t, const OptVal> checked_optval() const {
if (!optval_) {
return fit::as_error<int16_t>(EFAULT);
}
return fit::success(optval_);
}
// The only exception that allows direct access is when `optlen_` is not a pointer.
template <typename T = OptLen, typename = std::enable_if_t<!std::is_pointer_v<T>>>
OptLen optlen() const {
return optlen_;
}
template <typename T = OptLen, typename = std::enable_if_t<std::is_pointer_v<T>>>
fit::result<int16_t, const OptLen> checked_optlen() const {
if (!optlen_) {
return fit::as_error<int16_t>(EFAULT);
}
return fit::success(optlen_);
}
template <typename T = OptLen, typename = std::enable_if_t<std::is_pointer_v<T>>>
fit::result<int16_t, std::pair<const OptVal, const OptLen>> checked_optval_and_optlen() const {
if (!optlen_ || !optval_) {
return fit::as_error<int16_t>(EFAULT);
}
return fit::success(std::pair(optval_, optlen_));
}
private:
const OptVal optval_;
const OptLen optlen_;
};
class GetSockOptProcessor : OptValAndLen<void*, socklen_t*> {
public:
GetSockOptProcessor(void* optval, socklen_t* optlen) : OptValAndLen(optval, 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) {
auto optval_len = checked_optval_and_optlen();
if (optval_len.is_error()) {
return optval_len.take_error();
}
auto [optval, optlen] = *optval_len;
if (data_len > *optlen) {
return SockOptResult::Errno(EINVAL);
}
memcpy(optval, data, data_len);
*optlen = data_len;
return SockOptResult::Ok();
}
};
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) {
auto optval_len = checked_optval_and_optlen();
if (optval_len.is_error()) {
return optval_len.take_error();
}
auto [optval, optlen] = *optval_len;
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) {
auto optval_len = checked_optval_and_optlen();
if (optval_len.is_error()) {
return optval_len.take_error();
}
auto [optval, optlen] = *optval_len;
*optlen = std::min(*optlen, static_cast<socklen_t>(value.string.size()));
if (*optlen > 0) {
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) {
auto optval_len = checked_optval_and_optlen();
if (optval_len.is_error()) {
return optval_len.take_error();
}
auto [optval, optlen] = *optval_len;
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));
auto optlen = checked_optlen();
if (optlen.is_error()) {
return optlen.take_error();
}
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))));
}
template <>
SockOptResult GetSockOptProcessor::StoreOption(const fuchsia_net::wire::SocketAddress& value) {
auto optval_len = checked_optval_and_optlen();
if (optval_len.is_error()) {
return optval_len.take_error();
}
auto [optval, optlen] = *optval_len;
*optlen = fidl_to_sockaddr(value, optval, *optlen);
return SockOptResult::Ok();
}
// TODO(https://fxbug.dev/384115233): Update after the API is stabilized.
#if FUCHSIA_API_LEVEL_AT_LEAST(HEAD)
struct FidlSocketMarkWithDomain {
FidlSocketMarkWithDomain() = default;
explicit FidlSocketMarkWithDomain(fsocket::wire::OptionalUint32 mark,
fnet::wire::MarkDomain domain)
: mark(mark), domain(domain) {}
fsocket::wire::OptionalUint32 mark;
fnet::wire::MarkDomain domain;
};
zxio_socket_mark_domain_t from_fidl_mark_domain(fnet::wire::MarkDomain domain) {
switch (domain) {
case fnet::wire::MarkDomain::kMark1:
return ZXIO_SOCKET_MARK_DOMAIN_1;
case fnet::wire::MarkDomain::kMark2:
return ZXIO_SOCKET_MARK_DOMAIN_2;
}
}
fit::result<int16_t, fnet::wire::MarkDomain> into_fidl_mark_domain(
zxio_socket_mark_domain_t domain) {
switch (domain) {
case ZXIO_SOCKET_MARK_DOMAIN_1:
return fit::success(fnet::wire::MarkDomain::kMark1);
case ZXIO_SOCKET_MARK_DOMAIN_2:
return fit::success(fnet::wire::MarkDomain::kMark2);
default:
return fit::as_error<int16_t>(EINVAL);
}
}
template <>
SockOptResult GetSockOptProcessor::StoreOption(const FidlSocketMarkWithDomain& mark_and_domain) {
const auto& [mark, domain] = mark_and_domain;
// Fuchsia socket marks are optional. It's different between having a mark with 0
// and not having a mark at all. So if `is_present` is false, then `value` has
// no meaning.
zxio_socket_mark_t socket_mark{
.value = mark.is_value() ? mark.value() : 0,
.domain = from_fidl_mark_domain(domain),
.is_present = mark.is_value(),
};
return StoreRaw(&socket_mark, sizeof(socket_mark));
}
#endif
// 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) {
auto optval_len = checked_optval_and_optlen();
if (optval_len.is_error()) {
return optval_len.take_error();
}
auto [optval, optlen] = *optval_len;
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 : OptValAndLen<const void*, socklen_t> {
public:
SetSockOptProcessor(const void* optval, socklen_t optlen) : OptValAndLen(optval, optlen) {}
template <typename T>
using GetResult = fit::result<int16_t, T>;
template <typename T>
GetResult<T> Get() {
if (optlen() < sizeof(T)) {
return fit::as_error<int16_t>(EINVAL);
}
auto optval = checked_optval();
if (optval.is_error()) {
return optval.take_error();
}
return fit::success(fbl::UnalignedLoad<T>(*optval));
}
template <typename T, typename F>
SockOptResult Process(F f) {
auto result = Get<T>();
if (result.is_error()) {
return SockOptResult::Errno(result.error_value());
}
return SockOptResult::FromFidlResponse(f(result.value()));
}
};
template <>
SetSockOptProcessor::GetResult<fidl::StringView> SetSockOptProcessor::Get() {
auto optval = checked_optval();
if (optval.is_error()) {
return optval.take_error();
}
const char* str = static_cast<const char*>(*optval);
return fit::success(fidl::StringView::FromExternal(str, strnlen(str, optlen())));
}
template <>
SetSockOptProcessor::GetResult<bool> SetSockOptProcessor::Get() {
auto r = Get<int32_t>();
if (r.is_error())
return r;
return fit::success(r.value() != 0);
}
template <>
SetSockOptProcessor::GetResult<uint32_t> SetSockOptProcessor::Get() {
auto r = Get<int32_t>();
if (r.is_error()) {
return r;
}
if (r.value() < 0) {
return fit::as_error<int16_t>(EINVAL);
}
return fit::success<uint32_t>(r.value());
}
template <>
SetSockOptProcessor::GetResult<fsocket::wire::OptionalUint8> SetSockOptProcessor::Get() {
auto r = Get<int32_t>();
if (r.is_error()) {
return r.take_error();
}
auto i = r.value();
if (i < -1 || i > std::numeric_limits<uint8_t>::max()) {
return fit::as_error<int16_t>(EINVAL);
}
if (i == -1) {
return fit::success(fsocket::wire::OptionalUint8::WithUnset({}));
} else {
return fit::success(fsocket::wire::OptionalUint8::WithValue(static_cast<uint8_t>(i)));
}
}
// Like OptionalUint8, but permits truncation to a single byte.
struct OptionalUint8CharAllowed {
fsocket::wire::OptionalUint8 inner;
};
template <>
SetSockOptProcessor::GetResult<OptionalUint8CharAllowed> SetSockOptProcessor::Get() {
if (optlen() == sizeof(uint8_t)) {
auto optval = checked_optval();
if (optval.is_error()) {
return optval.take_error();
}
return fit::success(
fsocket::wire::OptionalUint8::WithValue(*static_cast<const uint8_t*>(*optval)));
}
return Get<fsocket::wire::OptionalUint8>();
}
template <>
SetSockOptProcessor::GetResult<fsocket::wire::IpMulticastMembership> SetSockOptProcessor::Get() {
struct in_addr local;
struct in_addr mcast;
fsocket::wire::IpMulticastMembership out;
if (optlen() < sizeof(struct ip_mreqn)) {
auto req = Get<struct ip_mreq>();
if (req.is_error()) {
return fit::as_error<int16_t>(EINVAL);
}
out.iface = 0;
local = req->imr_interface;
mcast = req->imr_multiaddr;
} else {
auto reqn = Get<struct ip_mreqn>();
if (reqn.is_error()) {
return fit::as_error<int16_t>(EINVAL);
}
out.iface = reqn->imr_ifindex;
local = reqn->imr_address;
mcast = 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 fit::success(out);
}
template <>
SetSockOptProcessor::GetResult<fsocket::wire::Ipv6MulticastMembership> SetSockOptProcessor::Get() {
auto req = Get<struct ipv6_mreq>();
if (req.is_error()) {
return fit::as_error<int16_t>(EINVAL);
}
fsocket::wire::Ipv6MulticastMembership out;
out.iface = req->ipv6mr_interface;
static_assert(sizeof(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 fit::success(out);
}
template <>
SetSockOptProcessor::GetResult<frawsocket::wire::Icmpv6Filter> SetSockOptProcessor::Get() {
auto filter = Get<struct icmp6_filter>();
if (filter.is_error()) {
return fit::as_error<int16_t>(EINVAL);
}
static_assert(sizeof(filter.value()) == sizeof(frawsocket::wire::Icmpv6Filter::blocked_types));
return fit::success(fbl::UnalignedLoad<frawsocket::wire::Icmpv6Filter>(&filter.value()));
}
template <>
SetSockOptProcessor::GetResult<fsocket::wire::TcpCongestionControl> SetSockOptProcessor::Get() {
auto optval = checked_optval();
if (optval.is_error()) {
return optval.take_error();
}
if (strncmp(static_cast<const char*>(*optval), kCcCubic, optlen()) == 0) {
return fit::success(fsocket::wire::TcpCongestionControl::kCubic);
}
if (strncmp(static_cast<const char*>(*optval), kCcReno, optlen()) == 0) {
return fit::success(fsocket::wire::TcpCongestionControl::kReno);
}
return fit::as_error<int16_t>(ENOENT);
}
struct IntOrChar {
int32_t value;
};
template <>
SetSockOptProcessor::GetResult<IntOrChar> SetSockOptProcessor::Get() {
auto value = Get<int32_t>();
if (value.is_ok()) {
return value.take_value();
}
if (optlen() == 0) {
return fit::as_error<int16_t>(EINVAL);
}
auto optval = checked_optval();
if (optval.is_error()) {
return optval.take_error();
}
return fit::success(*static_cast<const uint8_t*>(*optval));
}
// TODO(https://fxbug.dev/384115233): Update after the API is stabilized.
#if FUCHSIA_API_LEVEL_AT_LEAST(HEAD)
template <>
SetSockOptProcessor::GetResult<FidlSocketMarkWithDomain> SetSockOptProcessor::Get() {
auto socket_mark = Get<zxio_socket_mark_t>();
if (socket_mark.is_error()) {
return fit::as_error<int16_t>(EINVAL);
}
auto fidl_domain_result = into_fidl_mark_domain(socket_mark->domain);
if (fidl_domain_result.is_error()) {
return fidl_domain_result.take_error();
}
return fit::success(FidlSocketMarkWithDomain(
socket_mark->is_present ? fsocket::wire::OptionalUint32::WithValue(socket_mark->value)
: fsocket::wire::OptionalUint32::WithUnset(fsocket::wire::Empty{}),
fidl_domain_result.value()));
}
#endif
template <typename Client,
typename = std::enable_if_t<
std::is_same_v<Client, fidl::WireSyncClient<fsocket::SynchronousDatagramSocket>> ||
std::is_same_v<Client, fidl::WireSyncClient<fsocket::DatagramSocket>> ||
std::is_same_v<Client, fidl::WireSyncClient<fsocket::StreamSocket>> ||
std::is_same_v<Client, fidl::WireSyncClient<frawsocket::Socket>> ||
std::is_same_v<Client, fidl::WireSyncClient<fpacketsocket::Socket>>>>
class base_socket {
static_assert(std::is_same_v<Client, fidl::WireSyncClient<fsocket::SynchronousDatagramSocket>> ||
std::is_same_v<Client, fidl::WireSyncClient<fsocket::DatagramSocket>> ||
std::is_same_v<Client, fidl::WireSyncClient<fsocket::StreamSocket>> ||
std::is_same_v<Client, fidl::WireSyncClient<frawsocket::Socket>> ||
std::is_same_v<Client, fidl::WireSyncClient<fpacketsocket::Socket>>);
public:
explicit base_socket(Client& client) : client_(client) {}
Client& client() { return client_; }
zx_status_t CloseSocket() {
const fidl::WireResult result = client_->Close();
if (!result.ok()) {
return result.status();
}
const auto& response = result.value();
if (response.is_error()) {
return response.error_value();
}
return client_.client_end().channel().wait_one(ZX_CHANNEL_PEER_CLOSED, zx::time::infinite(),
nullptr);
}
zx_status_t CloneSocket(zx_handle_t* out_handle) {
auto [client, server] = fidl::Endpoints<fuchsia_unknown::Cloneable>::Create();
#if FUCHSIA_API_LEVEL_AT_LEAST(26)
zx_status_t status = client_->Clone(std::move(server)).status();
#else
zx_status_t status = client_->Clone2(std::move(server)).status();
#endif
if (status != ZX_OK) {
return status;
}
*out_handle = client.TakeChannel().release();
return ZX_OK;
}
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<Client, fidl::WireSyncClient<fsocket::DatagramSocket>> ||
std::is_same_v<Client,
fidl::WireSyncClient<fsocket::SynchronousDatagramSocket>>) {
return proc.StoreOption<int32_t>(SOCK_DGRAM);
}
if constexpr (std::is_same_v<Client, fidl::WireSyncClient<fsocket::StreamSocket>>) {
return proc.StoreOption<int32_t>(SOCK_STREAM);
}
if constexpr (std::is_same_v<Client, fidl::WireSyncClient<frawsocket::Socket>>) {
return proc.StoreOption<int32_t>(SOCK_RAW);
}
if constexpr (std::is_same_v<Client, 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<Client, 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<Client, fidl::WireSyncClient<fsocket::DatagramSocket>> ||
std::is_same_v<Client,
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<Client, 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<Client, 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<Client, 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(),
[](const auto& response) -> const fidl::StringView& { return response.value; });
#if FUCHSIA_API_LEVEL_AT_LEAST(20)
case SO_BINDTOIFINDEX:
return proc.Process(client()->GetBindToInterfaceIndex(), [](const auto& response) {
// It's unfortunate to cast through `int32_t`, but since this is what
// Linux uses to represent interface IDs, we want to be able to report
// the same values.
return static_cast<int32_t>(response.value);
});
#endif
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,
};
});
#if FUCHSIA_API_LEVEL_AT_LEAST(HEAD)
case SO_FUCHSIA_MARK: {
if (*optlen < sizeof(zxio_socket_mark_t)) {
return SockOptResult::Errno(EINVAL);
}
zxio_socket_mark_domain_t domain = fbl::UnalignedLoad<zxio_socket_mark_t>(optval).domain;
auto fidl_domain_result = into_fidl_mark_domain(domain);
if (fidl_domain_result.is_error()) {
return SockOptResult::Errno(fidl_domain_result.error_value());
}
auto fidl_domain = fidl_domain_result.value();
return proc.Process(client()->GetMark(fidl_domain), [fidl_domain](const auto& response) {
return FidlSocketMarkWithDomain(response.mark, fidl_domain);
});
}
#endif
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); });
#if FUCHSIA_API_LEVEL_AT_LEAST(20)
case SO_BINDTOIFINDEX:
// It's unfortunate to cast through `int32_t`, but since this is what
// Linux uses to represent interface IDs, we want to be able to accept
// the same values.
return proc.Process<int32_t>([this](int32_t value) {
return client()->SetBindToInterfaceIndex(static_cast<uint64_t>(value));
});
#endif
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); });
// TODO(https://fxbug.dev/384115233): Update after the API is stabilized.
#if FUCHSIA_API_LEVEL_AT_LEAST(HEAD)
case SO_FUCHSIA_MARK:
return proc.Process<FidlSocketMarkWithDomain>([this](auto mark_and_domain) {
auto [mark, domain] = mark_and_domain;
return client()->SetMark(domain, mark);
});
#endif
case SO_SNDTIMEO:
case SO_RCVTIMEO:
return SockOptResult::Errno(ENOTSUP);
default:
return SockOptResult::Errno(ENOPROTOOPT);
}
}
private:
Client& 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>> ||
std::is_same_v<T, fidl::WireSyncClient<fsocket::DatagramSocket>>>>
struct network_socket : public base_socket<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>> ||
std::is_same_v<T, fidl::WireSyncClient<fsocket::DatagramSocket>>);
public:
using base_socket = base_socket<T>;
using base_socket::client;
explicit network_socket(T& client) : base_socket(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());
} else {
*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 base_socket::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; });
case SO_ORIGINAL_DST:
return proc.Process(client()->GetOriginalDestination(),
[](const auto& response) { return response.value; });
case IP_RECVORIGDSTADDR:
return proc.Process(client()->GetIpReceiveOriginalDestinationAddress(),
[](const auto& response) { return response.value; });
case IP_TRANSPARENT:
return proc.Process(client()->GetIpTransparent(),
[](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(EOPNOTSUPP);
}
}
SockOptResult setsockopt_fidl(int level, int optname, const void* optval, socklen_t optlen) {
SetSockOptProcessor proc(optval, optlen);
switch (level) {
case SOL_SOCKET:
return base_socket::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 IP_RECVORIGDSTADDR:
return proc.Process<IntOrChar>([this](IntOrChar value) {
return client()->SetIpReceiveOriginalDestinationAddress(value.value != 0);
});
case IP_TRANSPARENT:
return proc.Process<IntOrChar>(
[this](IntOrChar value) { return client()->SetIpTransparent(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(ENOPROTOOPT);
}
}
zx_status_t shutdown(zxio_shutdown_options_t options, int16_t* out_code) {
using fsocket::wire::ShutdownMode;
ShutdownMode mode;
if (options == ZXIO_SHUTDOWN_OPTIONS_READ) {
mode = ShutdownMode::kRead;
} else if (options == ZXIO_SHUTDOWN_OPTIONS_WRITE) {
mode = ShutdownMode::kWrite;
} else if (options == (ZXIO_SHUTDOWN_OPTIONS_READ | ZXIO_SHUTDOWN_OPTIONS_WRITE)) {
mode = ShutdownMode::kRead | ShutdownMode::kWrite;
} else {
return ZX_ERR_INVALID_ARGS;
}
const auto response = client()->Shutdown(mode);
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;
}
};
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(); }
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;
}
}
void recvmsg_populate_socketaddress(const fidl::WireOptional<fnet::wire::SocketAddress>& fidl,
void* addr, socklen_t& addr_len) {
// Result address is absent when it's not provided by the server (when the address
// is not requested).
if (!fidl.has_value()) {
return;
}
addr_len = fidl_to_sockaddr(fidl.value(), addr, addr_len);
}
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;
}
}
void populate_from_fidl_hwaddr(const fpacketsocket::wire::HardwareAddress& addr, sockaddr_ll& s) {
switch (addr.Which()) {
default:
// The server is newer than us and sending a variant we don't understand,
// or there was a new |HardwareAddress| member that is yet to be handled.
__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;
}
}
// A helper structure to keep a packet info and any members' variants
// allocations on the stack.
class PacketInfo {
public:
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<fuchsia_posix_socket_packet::wire::PacketInfo>> WithFIDL(
F fn) {
auto packet_info = [this]() -> fuchsia_posix_socket_packet::wire::PacketInfo {
return {
.protocol = protocol_,
.interface_id = interface_id_,
.addr =
[this]() {
if (eui48_storage_.has_value()) {
return fuchsia_posix_socket_packet::wire::HardwareAddress::WithEui48(
fidl::ObjectView<fuchsia_net::wire::MacAddress>::FromExternal(
&eui48_storage_.value()));
}
return fuchsia_posix_socket_packet::wire::HardwareAddress::WithNone({});
}(),
};
}();
return fn(fidl::ObjectView<fuchsia_posix_socket_packet::wire::PacketInfo>::FromExternal(
&packet_info));
}
private:
decltype(fuchsia_posix_socket_packet::wire::PacketInfo::protocol) protocol_;
decltype(fuchsia_posix_socket_packet::wire::PacketInfo::interface_id) interface_id_;
std::optional<fuchsia_net::wire::MacAddress> eui48_storage_;
};
struct SynchronousDatagramSocket {
using FidlSockAddr = SocketAddress;
using FidlSendControlData = fsocket::wire::DatagramSocketSendControlData;
struct Storage {
using FidlProtocol = fuchsia_posix_socket::SynchronousDatagramSocket;
zxio_t io;
zx::eventpair event;
fidl::WireSyncClient<FidlProtocol> client;
};
static_assert(sizeof(Storage) <= sizeof(zxio_storage_t), "must fit inside zxio_storage_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/42162902): 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 FidlSockAddr = SocketAddress;
using FidlSendControlData = fsocket::wire::NetworkSocketSendControlData;
struct Storage {
using FidlProtocol = fuchsia_posix_socket_raw::Socket;
zxio_t io;
zx::eventpair event;
fidl::WireSyncClient<FidlProtocol> client;
};
static_assert(sizeof(Storage) <= sizeof(zxio_storage_t), "must fit inside zxio_storage_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/42162902): Drop this method once DatagramSocket.SendMsg
// no longer returns a length field.
}
};
struct PacketSocket {
using FidlSockAddr = PacketInfo;
using FidlSendControlData = fpacketsocket::wire::SendControlData;
struct Storage {
using FidlProtocol = fuchsia_posix_socket_packet::Socket;
zxio_t io;
zx::eventpair event;
fidl::WireSyncClient<FidlProtocol> client;
};
static_assert(sizeof(Storage) <= sizeof(zxio_storage_t), "must fit inside zxio_storage_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/42162902): Drop this method once DatagramSocket.SendMsg
// no longer returns a length field.
}
};
std::optional<size_t> total_iov_len(const struct msghdr& msg) {
size_t total = 0;
for (int i = 0; i < msg.msg_iovlen; ++i) {
const iovec& iov = msg.msg_iov[i];
if (iov.iov_base == nullptr && iov.iov_len != 0) {
return std::nullopt;
}
total += iov.iov_len;
}
return total;
}
size_t set_trunc_flags_and_return_out_actual(struct msghdr& msg, size_t written, size_t truncated,
int flags) {
if (truncated != 0) {
msg.msg_flags |= MSG_TRUNC;
} else {
msg.msg_flags &= ~MSG_TRUNC;
}
if ((flags & MSG_TRUNC) != 0) {
written += truncated;
}
return written;
}
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,
const RequestedCmsgSet& requested) {
socklen_t total = 0;
if (control_data.has_network()) {
total += Store(control_data.network(), requested);
}
return total;
}
socklen_t Store(fsocket::wire::NetworkSocketRecvControlData const& control_data,
const RequestedCmsgSet& requested) {
socklen_t total = 0;
if (control_data.has_socket()) {
total += Store(control_data.socket(), requested);
}
if (control_data.has_ip()) {
total += Store(control_data.ip(), requested);
}
if (control_data.has_ipv6()) {
total += Store(control_data.ipv6(), requested);
}
return total;
}
socklen_t Store(fpacketsocket::wire::RecvControlData const& control_data,
const RequestedCmsgSet& requested) {
socklen_t total = 0;
if (control_data.has_socket()) {
total += Store(control_data.socket(), requested);
}
return total;
}
private:
socklen_t Store(fsocket::wire::SocketRecvControlData const& control_data,
const RequestedCmsgSet& requested) {
socklen_t total = 0;
if (control_data.has_timestamp()) {
const fsocket::wire::Timestamp& timestamp = control_data.timestamp();
std::chrono::duration t = std::chrono::nanoseconds(timestamp.nanoseconds);
std::chrono::seconds sec = std::chrono::duration_cast<std::chrono::seconds>(t);
std::optional<fsocket::wire::TimestampOption> requested_ts = requested.so_timestamp();
const fsocket::wire::TimestampOption& which_timestamp =
requested_ts.has_value() ? requested_ts.value() : timestamp.requested;
switch (which_timestamp) {
case fsocket::wire::TimestampOption::kNanosecond: {
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::TimestampOption::kMicrosecond: {
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;
case fsocket::wire::TimestampOption::kDisabled:
break;
}
}
return total;
}
socklen_t Store(fsocket::wire::IpRecvControlData const& control_data,
const RequestedCmsgSet& requested) {
socklen_t total = 0;
if (requested.ip_tos() && control_data.has_tos()) {
const uint8_t tos = control_data.tos();
total += StoreControlMessage(IPPROTO_IP, IP_TOS, &tos, sizeof(tos));
}
if (requested.ip_ttl() && 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));
}
if (requested.ip_recvorigdstaddr() && control_data.has_original_destination_address()) {
struct sockaddr_storage addr;
socklen_t addr_len =
fidl_to_sockaddr(control_data.original_destination_address(), &addr, sizeof(addr));
total += StoreControlMessage(IPPROTO_IP, IP_RECVORIGDSTADDR, &addr, addr_len);
}
return total;
}
socklen_t Store(fsocket::wire::Ipv6RecvControlData const& control_data,
const RequestedCmsgSet& requested) {
socklen_t total = 0;
if (requested.ipv6_tclass() && 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 (requested.ipv6_hoplimit() && 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 (requested.ipv6_pktinfo() && 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/42167124): 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_;
};
int16_t ParseSocketLevelControlMessage(
fidl::WireTableBuilder<fsocket::wire::SocketSendControlData>& fidl_socket, int type,
const void* data, socklen_t len) {
// TODO(https://fxbug.dev/42170274): Validate unsupported SOL_SOCKET control messages.
return 0;
}
int16_t ParseIpLevelControlMessage(
fidl::WireTableBuilder<fsocket::wire::IpSendControlData>& fidl_ip, int type, const void* data,
socklen_t len) {
switch (type) {
case IP_TTL: {
int ttl;
if (len != CMSG_LEN(sizeof(ttl))) {
return EINVAL;
}
memcpy(&ttl, data, sizeof(ttl));
if (ttl < 0 || ttl > std::numeric_limits<uint8_t>::max()) {
return EINVAL;
}
// N.B. This extra validation is performed here in the client since the payload
// might be processed by the Netstack asynchronously.
//
// See: https://fuchsia.dev/fuchsia-src/contribute/governance/rfcs/0109_socket_datagram_socket
if (ttl == 0) {
return EINVAL;
}
fidl_ip.ttl(static_cast<uint8_t>(ttl));
return 0;
}
default:
// TODO(https://fxbug.dev/42170274): Validate unsupported SOL_IP control messages.
return 0;
}
}
int16_t ParseIpv6LevelControlMessage(
fidl::WireTableBuilder<fsocket::wire::Ipv6SendControlData>& fidl_ipv6, int type,
const void* data, socklen_t data_len) {
switch (type) {
case IPV6_HOPLIMIT: {
int hoplimit;
if (data_len != CMSG_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.hoplimit(static_cast<uint8_t>(hoplimit));
}
return 0;
}
case IPV6_PKTINFO: {
in6_pktinfo pktinfo;
if (data_len != CMSG_LEN(sizeof(pktinfo))) {
return EINVAL;
}
memcpy(&pktinfo, data, sizeof(pktinfo));
fsocket::wire::Ipv6PktInfoSendControlData fidl_pktinfo{
.iface = static_cast<uint64_t>(pktinfo.ipi6_ifindex),
};
static_assert(sizeof(pktinfo.ipi6_addr) == sizeof(fidl_pktinfo.local_addr.addr),
"mismatch between size of FIDL and in6_pktinfo IPv6 addresses");
memcpy(fidl_pktinfo.local_addr.addr.data(), &pktinfo.ipi6_addr, sizeof(pktinfo.ipi6_addr));
fidl_ipv6.pktinfo(fidl_pktinfo);
return 0;
}
default:
// TODO(https://fxbug.dev/42170274): Validate unsupported SOL_IPV6 control messages.
return 0;
}
}
template <typename F>
int16_t ParseMultipleControlMessages(fidl::AnyArena& allocator, const struct msghdr& msg,
F parse_control_message) {
if (msg.msg_control == nullptr && msg.msg_controllen != 0) {
return static_cast<int16_t>(EFAULT);
}
socklen_t total_cmsg_len = 0;
for (cmsghdr* cmsg = CMSG_FIRSTHDR(&msg); cmsg != nullptr; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
const cmsghdr& cmsg_ref = *cmsg;
total_cmsg_len += cmsg_ref.cmsg_len;
// Validate the header length.
// https://github.com/torvalds/linux/blob/42eb8fdac2f/include/linux/socket.h#L119-L122
if (msg.msg_controllen < total_cmsg_len || cmsg_ref.cmsg_len < sizeof(cmsghdr)) {
return static_cast<int16_t>(EINVAL);
}
int16_t err = parse_control_message(allocator, cmsg_ref);
if (err != 0) {
return err;
}
}
return 0;
}
fit::result<int16_t, fsocket::wire::NetworkSocketSendControlData> ParseNetworkSocketSendControlData(
fidl::AnyArena& allocator, const struct msghdr& msg) {
fidl::WireTableBuilder fidl_socket = fsocket::wire::SocketSendControlData::Builder(allocator);
fidl::WireTableBuilder fidl_ip = fsocket::wire::IpSendControlData::Builder(allocator);
fidl::WireTableBuilder fidl_ipv6 = fsocket::wire::Ipv6SendControlData::Builder(allocator);
int16_t err = ParseMultipleControlMessages(
allocator, msg,
[&fidl_socket, &fidl_ip, &fidl_ipv6](fidl::AnyArena& allocator,
const cmsghdr& cmsg) -> int16_t {
switch (cmsg.cmsg_level) {
case SOL_SOCKET:
return ParseSocketLevelControlMessage(fidl_socket, cmsg.cmsg_type, CMSG_DATA(&cmsg),
cmsg.cmsg_len);
case SOL_IP:
return ParseIpLevelControlMessage(fidl_ip, cmsg.cmsg_type, CMSG_DATA(&cmsg),
cmsg.cmsg_len);
case SOL_IPV6:
return ParseIpv6LevelControlMessage(fidl_ipv6, cmsg.cmsg_type, CMSG_DATA(&cmsg),
cmsg.cmsg_len);
default:
return 0;
}
});
if (err != 0) {
return fit::error(err);
}
return fit::success(fsocket::wire::NetworkSocketSendControlData::Builder(allocator)
.socket(fidl_socket.Build())
.ip(fidl_ip.Build())
.ipv6(fidl_ipv6.Build())
.Build());
}
template <typename T>
fit::result<int16_t, T> ParseControlMessages(fidl::AnyArena& allocator, const struct msghdr& msg);
template <>
fit::result<int16_t, fuchsia_posix_socket::wire::DatagramSocketSendControlData>
ParseControlMessages<fuchsia_posix_socket::wire::DatagramSocketSendControlData>(
fidl::AnyArena& allocator, const struct msghdr& msg) {
fit::result fidl_net = ParseNetworkSocketSendControlData(allocator, msg);
if (fidl_net.is_error()) {
return fidl_net.take_error();
}
return fit::success(fuchsia_posix_socket::wire::DatagramSocketSendControlData::Builder(allocator)
.network(fidl_net.value())
.Build());
}
template <>
fit::result<int16_t, fuchsia_posix_socket::wire::NetworkSocketSendControlData>
ParseControlMessages<fuchsia_posix_socket::wire::NetworkSocketSendControlData>(
fidl::AnyArena& allocator, const struct msghdr& msg) {
return ParseNetworkSocketSendControlData(allocator, msg);
}
fit::result<int16_t, fsocket::wire::SocketSendControlData> ParseSocketSendControlData(
fidl::AnyArena& allocator, const struct msghdr& msg) {
fidl::WireTableBuilder fidl_socket = fsocket::wire::SocketSendControlData::Builder(allocator);
int16_t err = ParseMultipleControlMessages(
allocator, msg, [&fidl_socket](fidl::AnyArena& allocator, const cmsghdr& cmsg) -> int16_t {
switch (cmsg.cmsg_level) {
case SOL_SOCKET:
return ParseSocketLevelControlMessage(fidl_socket, cmsg.cmsg_type, CMSG_DATA(&cmsg),
cmsg.cmsg_len);
default:
return 0;
}
});
if (err != 0) {
return fit::error(err);
}
return fit::success(fidl_socket.Build());
}
template <>
fit::result<int16_t, fuchsia_posix_socket::wire::SocketSendControlData>
ParseControlMessages<fuchsia_posix_socket::wire::SocketSendControlData>(fidl::AnyArena& allocator,
const struct msghdr& msg) {
return ParseSocketSendControlData(allocator, msg);
}
template <>
fit::result<int16_t, fuchsia_posix_socket_packet::wire::SendControlData>
ParseControlMessages<fuchsia_posix_socket_packet::wire::SendControlData>(fidl::AnyArena& allocator,
const struct msghdr& msg) {
fit::result fidl_socket = ParseSocketSendControlData(allocator, msg);
if (fidl_socket.is_error()) {
return fidl_socket.take_error();
}
return fit::success(fuchsia_posix_socket_packet::wire::SendControlData::Builder(allocator)
.socket(fidl_socket.value())
.Build());
}
template <typename R, typename = int>
struct FitResultHasValue : std::false_type {};
template <typename R>
struct FitResultHasValue<R, decltype(&R::value, 0)> : std::true_type {};
template <typename T, typename R>
typename std::enable_if<FitResultHasValue<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<!FitResultHasValue<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>>>
struct socket_with_event {
public:
explicit socket_with_event(typename T::Storage& zxio_storage)
: client_(zxio_storage.client), event_(zxio_storage.event) {}
void wait_begin(zxio_signals_t zxio_signals, zx_handle_t* handle, zx_signals_t* out_signals) {
*handle = event_.get();
zx_signals_t signals = ZX_EVENTPAIR_PEER_CLOSED | fsocket::wire::kSignalDatagramError;
if (zxio_signals & ZXIO_SIGNAL_READABLE) {
signals |=
fsocket::wire::kSignalDatagramIncoming | fsocket::wire::kSignalDatagramShutdownRead;
}
if (zxio_signals & ZXIO_SIGNAL_WRITABLE) {
signals |=
fsocket::wire::kSignalDatagramOutgoing | fsocket::wire::kSignalDatagramShutdownWrite;
}
if (zxio_signals & ZXIO_SIGNAL_READ_DISABLED) {
signals |= fsocket::wire::kSignalDatagramShutdownRead;
}
*out_signals = signals;
}
void wait_end(zx_signals_t signals, zxio_signals_t* out_zxio_signals) {
zxio_signals_t zxio_signals = 0;
if (signals & (ZX_EVENTPAIR_PEER_CLOSED | fsocket::wire::kSignalDatagramIncoming |
fsocket::wire::kSignalDatagramShutdownRead)) {
zxio_signals |= ZXIO_SIGNAL_READABLE;
}
if (signals & (ZX_EVENTPAIR_PEER_CLOSED | fsocket::wire::kSignalDatagramOutgoing |
fsocket::wire::kSignalDatagramShutdownWrite)) {
zxio_signals |= ZXIO_SIGNAL_WRITABLE;
}
if (signals & (ZX_EVENTPAIR_PEER_CLOSED | fsocket::wire::kSignalDatagramError)) {
zxio_signals |= ZXIO_SIGNAL_ERROR;
}
if (signals & (ZX_EVENTPAIR_PEER_CLOSED | fsocket::wire::kSignalDatagramShutdownRead)) {
zxio_signals |= ZXIO_SIGNAL_READ_DISABLED;
}
*out_zxio_signals = zxio_signals;
}
zx_status_t recvmsg(struct msghdr* msg, int flags, size_t* out_actual, int16_t* out_code) {
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 = client_->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);
if (unlikely(!zxio_maybe_faultable_copy(static_cast<uint8_t*>(iov.iov_base), data, actual,
true))) {
*out_code = EFAULT;
return ZX_OK;
}
data += actual;
remaining -= actual;
} else if (iov.iov_len != 0) {
*out_code = EFAULT;
return ZX_OK;
}
}
*out_actual = set_trunc_flags_and_return_out_actual(*msg, out.count() - remaining,
result.value()->truncated, flags);
}
if (want_cmsg) {
FidlControlDataProcessor proc(msg->msg_control, msg->msg_controllen);
// The synchronous datagram protocol returns all control messages found in the FIDL
// response. This behavior is implemented using a "filter" that allows everything
// through.
msg->msg_controllen =
proc.Store(result.value()->control, RequestedCmsgSet::AllRequestedCmsgSet());
} 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) {
// TODO(https://fxbug.dev/42061949) Add tests with msg as nullptr.
if (msg == nullptr) {
*out_code = EFAULT;
return ZX_OK;
}
const msghdr& msghdr_ref = *msg;
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 (msghdr_ref.msg_namelen != 0 || msghdr_ref.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;
}
}
std::optional opt_total = total_iov_len(*msg);
if (!opt_total.has_value()) {
*out_code = EFAULT;
return ZX_OK;
}
size_t total = opt_total.value();
fidl::Arena allocator;
fit::result cmsg_result =
ParseControlMessages<typename T::FidlSendControlData>(allocator, msghdr_ref);
if (cmsg_result.is_error()) {
*out_code = cmsg_result.error_value();
return ZX_OK;
}
const typename T::FidlSendControlData& cdata = cmsg_result.value();
std::unique_ptr<uint8_t[]> data;
auto vec = fidl::VectorView<uint8_t>();
switch (msg->msg_iovlen) {
case 0: {
break;
}
case 1: {
if (zxio_fault_catching_disabled()) {
const iovec& iov = *msg->msg_iov;
vec = fidl::VectorView<uint8_t>::FromExternal(static_cast<uint8_t*>(iov.iov_base),
iov.iov_len);
break;
}
// We reach here if the consumer of zxio expects faults to occur when
// accessing the message's paylod. We need to catch the fault now so
// that it can be gracefully handled instead of triggering a crash later
// on.
//
// TODO(https://fxbug.dev/42165811): avoid this copy to catch faults.
__FALLTHROUGH;
}
default: {
// TODO(https://fxbug.dev/42165811): avoid this copy to linearize the buffer.
data = std::unique_ptr<uint8_t[]>(new uint8_t[total]);
uint8_t* dest = data.get();
for (int i = 0; i < msg->msg_iovlen; ++i) {
const iovec& iov = msg->msg_iov[i];
if (unlikely(!zxio_maybe_faultable_copy(dest, static_cast<const uint8_t*>(iov.iov_base),
iov.iov_len, false))) {
*out_code = EFAULT;
return ZX_OK;
}
dest += iov.iov_len;
}
vec = fidl::VectorView<uint8_t>::FromExternal(data.get(), total);
}
}
// TODO(https://fxbug.dev/42136468): 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 client_->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;
}
private:
typename fidl::WireSyncClient<typename T::Storage::FidlProtocol>& client_;
zx::eventpair& event_;
};
} // namespace
static constexpr zxio_ops_t zxio_default_socket_ops = []() {
zxio_ops_t ops = zxio_default_ops;
ops.connect = [](zxio_t* io, const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) {
*out_code = EOPNOTSUPP;
return ZX_OK;
};
ops.listen = [](zxio_t* io, int backlog, int16_t* out_code) {
*out_code = EOPNOTSUPP;
return ZX_OK;
};
ops.accept = [](zxio_t* io, struct sockaddr* addr, socklen_t* addrlen,
zxio_storage_t* out_storage, int16_t* out_code) {
*out_code = EOPNOTSUPP;
return ZX_OK;
};
ops.getpeername = [](zxio_t* io, struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) {
*out_code = EOPNOTSUPP;
return ZX_OK;
};
ops.shutdown = [](zxio_t* io, zxio_shutdown_options_t options, int16_t* out_code) {
*out_code = EOPNOTSUPP;
return ZX_OK;
};
return ops;
}();
static SynchronousDatagramSocket::Storage& zxio_synchronous_datagram_socket(zxio_t* io) {
return *reinterpret_cast<SynchronousDatagramSocket::Storage*>(io);
}
static constexpr zxio_ops_t zxio_synchronous_datagram_socket_ops = []() {
zxio_ops_t ops = zxio_default_socket_ops;
ops.attr_get = AttrGet<ZXIO_OBJECT_TYPE_SYNCHRONOUS_DATAGRAM_SOCKET>;
ops.close = [](zxio_t* io, const bool should_wait) {
SynchronousDatagramSocket::Storage& zs = zxio_synchronous_datagram_socket(io);
zx_status_t status = ZX_OK;
if (zs.client.is_valid() && should_wait) {
status = base_socket(zs.client).CloseSocket();
}
zs.~Storage();
return status;
};
ops.release = [](zxio_t* io, zx_handle_t* out_handle) {
if (out_handle == nullptr) {
return ZX_ERR_INVALID_ARGS;
}
*out_handle =
zxio_synchronous_datagram_socket(io).client.TakeClientEnd().TakeChannel().release();
return ZX_OK;
};
ops.borrow = [](zxio_t* io, zx_handle_t* out_handle) {
*out_handle =
zxio_synchronous_datagram_socket(io).client.client_end().borrow().channel()->get();
return ZX_OK;
};
ops.clone = [](zxio_t* io, zx_handle_t* out_handle) {
SynchronousDatagramSocket::Storage& zs = zxio_synchronous_datagram_socket(io);
zx_status_t status = base_socket(zs.client).CloneSocket(out_handle);
return status;
};
ops.bind = [](zxio_t* io, const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) {
return network_socket(zxio_synchronous_datagram_socket(io).client)
.bind(addr, addrlen, out_code);
};
ops.connect = [](zxio_t* io, const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) {
return network_socket(zxio_synchronous_datagram_socket(io).client)
.connect(addr, addrlen, out_code);
};
ops.getsockname = [](zxio_t* io, struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) {
return network_socket(zxio_synchronous_datagram_socket(io).client)
.getsockname(addr, addrlen, out_code);
};
ops.getpeername = [](zxio_t* io, struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) {
return network_socket(zxio_synchronous_datagram_socket(io).client)
.getpeername(addr, addrlen, out_code);
};
ops.getsockopt = [](zxio_t* io, int level, int optname, void* optval, socklen_t* optlen,
int16_t* out_code) {
SockOptResult result = network_socket(zxio_synchronous_datagram_socket(io).client)
.getsockopt_fidl(level, optname, optval, optlen);
*out_code = result.err;
return result.status;
};
ops.setsockopt = [](zxio_t* io, int level, int optname, const void* optval, socklen_t optlen,
int16_t* out_code) {
SockOptResult result = network_socket(zxio_synchronous_datagram_socket(io).client)
.setsockopt_fidl(level, optname, optval, optlen);
*out_code = result.err;
return result.status;
};
ops.recvmsg = [](zxio_t* io, struct msghdr* msg, int flags, size_t* out_actual,
int16_t* out_code) {
return socket_with_event<SynchronousDatagramSocket>(zxio_synchronous_datagram_socket(io))
.recvmsg(msg, flags, out_actual, out_code);
};
ops.sendmsg = [](zxio_t* io, const struct msghdr* msg, int flags, size_t* out_actual,
int16_t* out_code) {
return socket_with_event<SynchronousDatagramSocket>(zxio_synchronous_datagram_socket(io))
.sendmsg(msg, flags, out_actual, out_code);
};
ops.shutdown = [](zxio_t* io, zxio_shutdown_options_t options, int16_t* out_code) {
return network_socket(zxio_synchronous_datagram_socket(io).client).shutdown(options, out_code);
};
ops.wait_begin = [](zxio_t* io, zxio_signals_t zxio_signals, zx_handle_t* handle,
zx_signals_t* out_signals) {
return socket_with_event<SynchronousDatagramSocket>(zxio_synchronous_datagram_socket(io))
.wait_begin(zxio_signals, handle, out_signals);
};
ops.wait_end = [](zxio_t* io, zx_signals_t zx_signals, zxio_signals_t* out_zxio_signals) {
return socket_with_event<SynchronousDatagramSocket>(zxio_synchronous_datagram_socket(io))
.wait_end(zx_signals, out_zxio_signals);
};
return ops;
}();
zx_status_t zxio_synchronous_datagram_socket_init(
zxio_storage_t* storage, zx::eventpair event,
fidl::ClientEnd<fsocket::SynchronousDatagramSocket> client) {
auto zs = new (storage) SynchronousDatagramSocket::Storage{
.io = storage->io,
.event = std::move(event),
.client = fidl::WireSyncClient(std::move(client)),
};
zxio_init(&zs->io, &zxio_synchronous_datagram_socket_ops);
return ZX_OK;
}
namespace {
template <typename Client,
typename = std::enable_if_t<
std::is_same_v<Client, fidl::WireSyncClient<fsocket::StreamSocket>> ||
std::is_same_v<Client, fidl::WireSyncClient<fsocket::DatagramSocket>>>>
class socket_with_zx_socket {
public:
explicit socket_with_zx_socket(Client& client) : client_(client) {}
protected:
Client& client() { return client_; }
virtual ErrOrOutCode GetError() = 0;
std::optional<ErrOrOutCode> GetZxSocketWriteError(zx_status_t status) {
switch (status) {
case ZX_OK:
return std::nullopt;
case ZX_ERR_INVALID_ARGS:
return zx::ok(static_cast<int16_t>(EFAULT));
case ZX_ERR_BAD_STATE:
__FALLTHROUGH;
case ZX_ERR_PEER_CLOSED: {
zx::result err = GetError();
if (err.is_error()) {
return zx::error(err.status_value());
}
if (int value = err.value(); value != 0) {
return zx::ok(static_cast<int16_t>(value));
}
// Error was consumed.
return zx::ok(static_cast<int16_t>(EPIPE));
}
default:
return zx::error(status);
}
}
virtual std::optional<ErrOrOutCode> GetZxSocketReadError(zx_status_t status) {
switch (status) {
case ZX_OK:
return std::nullopt;
case ZX_ERR_INVALID_ARGS:
return zx::ok(static_cast<int16_t>(EFAULT));
case ZX_ERR_BAD_STATE:
__FALLTHROUGH;
case ZX_ERR_PEER_CLOSED: {
zx::result err = GetError();
if (err.is_error()) {
return zx::error(err.status_value());
}
return zx::ok(static_cast<int16_t>(err.value()));
}
default:
return zx::error(status);
}
}
private:
Client& client_;
};
// A |zxio_t| backend that uses a fuchsia.posix.socket.DatagramSocket object.
using zxio_datagram_socket_t = struct zxio_datagram_socket {
zxio_t io;
zxio_pipe_t pipe;
const zxio_datagram_prelude_size_t prelude_size;
RouteCache route_cache;
RequestedCmsgCache cmsg_cache;
fidl::WireSyncClient<fuchsia_posix_socket::DatagramSocket> client;
};
static_assert(sizeof(zxio_datagram_socket_t) <= sizeof(zxio_storage_t),
"zxio_datagram_socket_t must fit inside zxio_storage_t.");
static zxio_datagram_socket_t& zxio_datagram_socket(zxio_t* io) {
return *reinterpret_cast<zxio_datagram_socket_t*>(io);
}
struct datagram_socket
: public socket_with_zx_socket<fidl::WireSyncClient<fsocket::DatagramSocket>> {
public:
explicit datagram_socket(zxio_datagram_socket_t& datagram_socket)
: socket_with_zx_socket(datagram_socket.client), datagram_socket_(datagram_socket) {}
void wait_begin(zxio_signals_t zxio_signals, zx_handle_t* handle, zx_signals_t* out_signals) {
zxio_signals |= ZXIO_SIGNAL_PEER_CLOSED;
// Translate the `WRITABLE` signal to `WRITE_THRESHOLD`, so that any caller
// waiting for the socket to become writable will actually wait for capacity
// to reach the socket's write threshold, which is set by the netstack to
// the maximum size of a payload. This allows callers to avoid spuriously
// retrying writes when the outgoing payload is larger than the remaining
// capacity in the socket.
if (zxio_signals & ZXIO_SIGNAL_WRITABLE) {
zxio_signals &= ~ZXIO_SIGNAL_WRITABLE;
zxio_signals |= ZXIO_SIGNAL_WRITE_THRESHOLD;
}
zxio_wait_begin(&datagram_socket_.pipe.io, zxio_signals, handle, out_signals);
*out_signals |= fsocket::wire::kSignalDatagramError;
}
void wait_end(zx_signals_t zx_signals, zxio_signals_t* out_zxio_signals) {
zxio_signals_t zxio_signals;
zxio_wait_end(&datagram_socket_.pipe.io, zx_signals, &zxio_signals);
// Translate the `WRITE_THRESHOLD` signal to `WRITABLE`. See `wait_begin`
// for why we do this.
//
// We don't mask out the `WRITE_THRESHOLD` signal because it's possible that
// the client actually waited on `WRITE_THRESHOLD` directly rather than
// `WRITABLE`, and there is no way to know here if that was the case. Note
// that this means that a client may see `WRITE_THRESHOLD` reported even if
// it did not provide it in `wait_begin`.
if (zxio_signals & ZXIO_SIGNAL_WRITE_THRESHOLD) {
zxio_signals |= ZXIO_SIGNAL_WRITABLE;
} else {
// Unconditionally mask out `WRITABLE` to avoid signaling it to the
// client.
//
// If `WRITABLE` (but not `WRITE_THRESHOLD`) is asserted on the underlying
// object and the wait completes for some other reason, and this signal is
// propagated to the client, they may attempt a write that will not
// succeed.
zxio_signals &= ~ZXIO_SIGNAL_WRITABLE;
}
if (zx_signals & fsocket::wire::kSignalDatagramError) {
zxio_signals |= ZXIO_SIGNAL_ERROR;
}
*out_zxio_signals = zxio_signals;
}
std::optional<ErrOrOutCode> GetZxSocketReadError(zx_status_t status) override {
switch (status) {
case ZX_ERR_BAD_STATE:
// Datagram sockets return EAGAIN when a socket is read from after shutdown,
// whereas stream sockets return zero bytes. Enforce this behavior here.
return zx::ok(static_cast<int16_t>(EAGAIN));
default:
return socket_with_zx_socket::GetZxSocketReadError(status);
}
}
zx_status_t recvmsg(struct msghdr* msg, int flags, size_t* out_actual, int16_t* out_code) {
// Before reading from the socket, we need to check for asynchronous
// errors. Here, we combine this check with a cache lookup for the
// requested control message set; when cmsgs are requested, this lets us
// save a syscall.
bool cmsg_requested = msg->msg_controllen != 0 && msg->msg_control != nullptr;
RequestedCmsgCache::Result cache_result = datagram_socket_.cmsg_cache.Get(
socket_err_wait_item(), cmsg_requested, datagram_socket_.client);
if (!cache_result.is_ok()) {
ErrOrOutCode err_value = cache_result.error_value();
if (err_value.is_error()) {
return err_value.status_value();
}
*out_code = err_value.value();
return ZX_OK;
}
std::optional<RequestedCmsgSet> requested_cmsg_set = cache_result.value();
zxio_flags_t zxio_flags = 0;
if (flags & MSG_PEEK) {
zxio_flags |= ZXIO_PEEK;
}
// Use stack allocated memory whenever the client-versioned `kRxUdpPreludeSize` is
// at least as large as the server's.
std::unique_ptr<uint8_t[]> heap_allocated_buf;
uint8_t stack_allocated_buf[zxio::kRxUdpPreludeSize];
uint8_t* buf = stack_allocated_buf;
if (datagram_socket_.prelude_size.rx > zxio::kRxUdpPreludeSize) {
heap_allocated_buf = std::make_unique<uint8_t[]>(datagram_socket_.prelude_size.rx);
buf = heap_allocated_buf.get();
}
zx_iovec_t zx_iov[msg->msg_iovlen + 1];
zx_iov[0] = {
.buffer = buf,
.capacity = datagram_socket_.prelude_size.rx,
};
size_t zx_iov_idx = 1;
std::optional<size_t> fault_idx;
{
size_t idx = 0;
for (int i = 0; i < msg->msg_iovlen; ++i) {
iovec const& iov = msg->msg_iov[i];
if (iov.iov_base != nullptr) {
zx_iov[zx_iov_idx] = {
.buffer = iov.iov_base,
.capacity = iov.iov_len,
};
zx_iov_idx++;
idx += iov.iov_len;
} else if (iov.iov_len != 0) {
fault_idx = idx;
break;
}
}
}
size_t count_bytes_read;
std::optional read_error = GetZxSocketReadError(
zxio_readv(&datagram_socket_.io, zx_iov, zx_iov_idx, zxio_flags, &count_bytes_read));
if (read_error.has_value()) {
zx::result err = read_error.value();
if (!err.is_error()) {
if (err.value() == 0) {
*out_actual = 0;
}
*out_code = err.value();
}
return err.status_value();
}
if (count_bytes_read < datagram_socket_.prelude_size.rx) {
*out_code = EIO;
return ZX_OK;
}
fit::result decoded_meta =
deserialize_recv_msg_meta(cpp20::span<uint8_t>(buf, datagram_socket_.prelude_size.rx));
if (!decoded_meta.is_ok()) {
*out_code = EIO;
return ZX_OK;
}
const fuchsia_posix_socket::wire::RecvMsgMeta& meta = *decoded_meta.value();
if (msg->msg_namelen != 0 && msg->msg_name != nullptr) {
if (!meta.has_from()) {
*out_code = EIO;
return ZX_OK;
}
msg->msg_namelen = static_cast<socklen_t>(fidl_to_sockaddr(
meta.from(), static_cast<struct sockaddr*>(msg->msg_name), msg->msg_namelen));
}
size_t payload_bytes_read = count_bytes_read - datagram_socket_.prelude_size.rx;
if (payload_bytes_read > meta.payload_len()) {
*out_code = EIO;
return ZX_OK;
}
if (fault_idx.has_value() && meta.payload_len() > fault_idx.value()) {
*out_code = EFAULT;
return ZX_OK;
}
size_t truncated =
meta.payload_len() > payload_bytes_read ? meta.payload_len() - payload_bytes_read : 0;
*out_actual = set_trunc_flags_and_return_out_actual(*msg, payload_bytes_read, truncated, flags);
if (cmsg_requested) {
FidlControlDataProcessor proc(msg->msg_control, msg->msg_controllen);
ZX_ASSERT_MSG(cmsg_requested == requested_cmsg_set.has_value(),
"cache lookup should return the RequestedCmsgSet iff it was requested");
msg->msg_controllen = proc.Store(meta.control(), requested_cmsg_set.value());
} else {
msg->msg_controllen = 0;
}
*out_code = 0;
return ZX_OK;
}
zx_status_t sendmsg(const struct msghdr* msg, int flags, size_t* out_actual, int16_t* out_code) {
// TODO(https://fxbug.dev/42061949) Add tests with msg as nullptr.
if (msg == nullptr) {
*out_code = EFAULT;
return ZX_OK;
}
const msghdr& msghdr_ref = *msg;
std::optional opt_total = total_iov_len(msghdr_ref);
if (!opt_total.has_value()) {
*out_code = EFAULT;
return ZX_OK;
}
size_t total = opt_total.value();
std::optional<SocketAddress> remote_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 = remote_addr.emplace().LoadSockAddr(
static_cast<struct sockaddr*>(msg->msg_name), msg->msg_namelen);
if (status != ZX_OK) {
return status;
}
}
constexpr size_t kSendControlDataArenaSize =
fidl::MaxSizeInChannel<fsocket::wire::DatagramSocketSendControlData,
fidl::MessageDirection::kSending>();
// Set a sensible upper limit for how much stack space we're going to allow
// using here to prevent deep stack usage in zxio/fdio. If this grows to
// untenable sizes we might have to change strategies here.
static_assert(kSendControlDataArenaSize <= 192);
fidl::Arena<kSendControlDataArenaSize> alloc;
fit::result cmsg_result =
ParseControlMessages<fsocket::wire::DatagramSocketSendControlData>(alloc, msghdr_ref);
if (cmsg_result.is_error()) {
*out_code = cmsg_result.error_value();
return ZX_OK;
}
const fsocket::wire::DatagramSocketSendControlData& cdata = cmsg_result.value();
const std::optional local_iface_and_addr =
[&cdata]() -> std::optional<std::pair<uint64_t, fuchsia_net::wire::Ipv6Address>> {
if (!cdata.has_network()) {
return {};
}
const fuchsia_posix_socket::wire::NetworkSocketSendControlData& network = cdata.network();
if (!network.has_ipv6()) {
return {};
}
const fuchsia_posix_socket::wire::Ipv6SendControlData& ipv6 = network.ipv6();
if (!ipv6.has_pktinfo()) {
return {};
}
const fuchsia_posix_socket::wire::Ipv6PktInfoSendControlData& pktinfo = ipv6.pktinfo();
return std::make_pair(pktinfo.iface, pktinfo.local_addr);
}();
RouteCache::Result result = datagram_socket_.route_cache.Get(
remote_addr, local_iface_and_addr, socket_err_wait_item(), datagram_socket_.client);
if (!result.is_ok()) {
ErrOrOutCode err_value = result.error_value();
if (err_value.is_error()) {
return err_value.status_value();
}
*out_code = err_value.value();
return ZX_OK;
}
if (result.value() < total) {
*out_code = EMSGSIZE;
return ZX_OK;
}
// Use stack allocated memory whenever the client-versioned `kTxUdpPreludeSize` is
// at least as large as the server's.
std::unique_ptr<uint8_t[]> heap_allocated_buf;
uint8_t stack_allocated_buf[zxio::kTxUdpPreludeSize];
uint8_t* buf = stack_allocated_buf;
if (datagram_socket_.prelude_size.tx > zxio::kTxUdpPreludeSize) {
heap_allocated_buf = std::make_unique<uint8_t[]>(datagram_socket_.prelude_size.tx);
buf = heap_allocated_buf.get();
}
auto meta_builder_with_cdata = [&alloc, &cdata]() {
fidl::WireTableBuilder meta_builder = fuchsia_posix_socket::wire::SendMsgMeta::Builder(alloc);
meta_builder.control(cdata);
return meta_builder;
};
auto build_and_serialize =
[this, &buf](fidl::WireTableBuilder<fsocket::wire::SendMsgMeta>& meta_builder) {
fsocket::wire::SendMsgMeta meta = meta_builder.Build();
return serialize_send_msg_meta(
meta, cpp20::span<uint8_t>(buf, datagram_socket_.prelude_size.tx));
};
SerializeSendMsgMetaError serialize_err;
if (remote_addr.has_value()) {
serialize_err = remote_addr.value().WithFIDL(
[&build_and_serialize, &meta_builder_with_cdata](fnet::wire::SocketAddress address) {
fidl::WireTableBuilder meta_builder = meta_builder_with_cdata();
meta_builder.to(address);
return build_and_serialize(meta_builder);
});
} else {
fidl::WireTableBuilder meta_builder = meta_builder_with_cdata();
serialize_err = build_and_serialize(meta_builder);
}
if (serialize_err != SerializeSendMsgMetaErrorNone) {
*out_code = EIO;
return ZX_OK;
}
zx_iovec_t zx_iov[msg->msg_iovlen + 1];
zx_iov[0] = {
.buffer = buf,
.capacity = datagram_socket_.prelude_size.tx,
};
size_t zx_iov_idx = 1;
for (int i = 0; i < msg->msg_iovlen; ++i) {
iovec const& iov = msg->msg_iov[i];
if (iov.iov_base != nullptr) {
zx_iov[zx_iov_idx] = {
.buffer = iov.iov_base,
.capacity = iov.iov_len,
};
zx_iov_idx++;
}
}
size_t bytes_written;
std::optional write_error = GetZxSocketWriteError(
zxio_writev(&datagram_socket_.io, zx_iov, zx_iov_idx, 0, &bytes_written));
if (write_error.has_value()) {
zx::result err = write_error.value();
if (!err.is_error()) {
*out_code = err.value();
}
return err.status_value();
}
size_t total_with_prelude = datagram_socket_.prelude_size.tx + total;
if (bytes_written != total_with_prelude) {
// Datagram writes should never be short.
*out_code = EIO;
return ZX_OK;
}
// A successful datagram socket write is never short, so we can assume all bytes
// were written.
*out_actual = total;
*out_code = 0;
return ZX_OK;
}
private:
zx_wait_item_t socket_err_wait_item() {
return {
.handle = datagram_socket_.pipe.socket.get(),
.waitfor = fsocket::wire::kSignalDatagramError,
};
}
ErrOrOutCode GetError() override {
std::optional err = GetErrorWithClient(client());
if (!err.has_value()) {
return zx::ok(static_cast<int16_t>(0));
}
return err.value();
}
zxio_datagram_socket_t& datagram_socket_;
};
} // namespace
static constexpr zxio_ops_t zxio_datagram_socket_ops = []() {
zxio_ops_t ops = zxio_default_socket_ops;
ops.attr_get = AttrGet<ZXIO_OBJECT_TYPE_DATAGRAM_SOCKET>;
ops.close = [](zxio_t* io, const bool should_wait) {
zxio_datagram_socket_t& zs = zxio_datagram_socket(io);
zx_status_t status = ZX_OK;
if (zs.client.is_valid() && should_wait) {
status = base_socket(zs.client).CloseSocket();
}
zs.~zxio_datagram_socket();
return status;
};
ops.release = [](zxio_t* io, zx_handle_t* out_handle) {
if (out_handle == nullptr) {
return ZX_ERR_INVALID_ARGS;
}
*out_handle = zxio_datagram_socket(io).client.TakeClientEnd().TakeChannel().release();
return ZX_OK;
};
ops.borrow = [](zxio_t* io, zx_handle_t* out_handle) {
*out_handle = zxio_datagram_socket(io).client.client_end().borrow().channel()->get();
return ZX_OK;
};
ops.clone = [](zxio_t* io, zx_handle_t* out_handle) {
return base_socket(zxio_datagram_socket(io).client).CloneSocket(out_handle);
};
ops.wait_begin = [](zxio_t* io, zxio_signals_t zxio_signals, zx_handle_t* out_handle,
zx_signals_t* out_zx_signals) {
datagram_socket(zxio_datagram_socket(io)).wait_begin(zxio_signals, out_handle, out_zx_signals);
};
ops.wait_end = [](zxio_t* io, zx_signals_t zx_signals, zxio_signals_t* out_zxio_signals) {
datagram_socket(zxio_datagram_socket(io)).wait_end(zx_signals, out_zxio_signals);
};
ops.readv = [](zxio_t* io, const zx_iovec_t* vector, size_t vector_count, zxio_flags_t flags,
size_t* out_actual) {
return zxio_readv(&zxio_datagram_socket(io).pipe.io, vector, vector_count, flags, out_actual);
};
ops.writev = [](zxio_t* io, const zx_iovec_t* vector, size_t vector_count, zxio_flags_t flags,
size_t* out_actual) {
return zxio_writev(&zxio_datagram_socket(io).pipe.io, vector, vector_count, flags, out_actual);
};
ops.shutdown = [](zxio_t* io, zxio_shutdown_options_t options, int16_t* out_code) {
return network_socket(zxio_datagram_socket(io).client).shutdown(options, out_code);
};
ops.bind = [](zxio_t* io, const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) {
return network_socket(zxio_datagram_socket(io).client).bind(addr, addrlen, out_code);
};
ops.connect = [](zxio_t* io, const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) {
return network_socket(zxio_datagram_socket(io).client).connect(addr, addrlen, out_code);
};
ops.getsockname = [](zxio_t* io, struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) {
return network_socket(zxio_datagram_socket(io).client).getsockname(addr, addrlen, out_code);
};
ops.getpeername = [](zxio_t* io, struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) {
return network_socket(zxio_datagram_socket(io).client).getpeername(addr, addrlen, out_code);
};
ops.getsockopt = [](zxio_t* io, int level, int optname, void* optval, socklen_t* optlen,
int16_t* out_code) {
SockOptResult result = network_socket(zxio_datagram_socket(io).client)
.getsockopt_fidl(level, optname, optval, optlen);
*out_code = result.err;
return result.status;
};
ops.setsockopt = [](zxio_t* io, int level, int optname, const void* optval, socklen_t optlen,
int16_t* out_code) {
SockOptResult result = network_socket(zxio_datagram_socket(io).client)
.setsockopt_fidl(level, optname, optval, optlen);
*out_code = result.err;
return result.status;
};
ops.recvmsg = [](zxio_t* io, struct msghdr* msg, int flags, size_t* out_actual,
int16_t* out_code) {
return datagram_socket(zxio_datagram_socket(io)).recvmsg(msg, flags, out_actual, out_code);
};
ops.sendmsg = [](zxio_t* io, const struct msghdr* msg, int flags, size_t* out_actual,
int16_t* out_code) {
return datagram_socket(zxio_datagram_socket(io)).sendmsg(msg, flags, out_actual, out_code);
};
return ops;
}();
zx_status_t zxio_datagram_socket_init(zxio_storage_t* storage, zx::socket socket,
const zx_info_socket_t& info,
const zxio_datagram_prelude_size_t& prelude_size,
fidl::ClientEnd<fsocket::DatagramSocket> client) {
auto zs = new (storage) zxio_datagram_socket_t{
.io = {},
.pipe = {},
.prelude_size = prelude_size,
.client = fidl::WireSyncClient(std::move(client)),
};
zxio_init(&zs->io, &zxio_datagram_socket_ops);
return zxio_pipe_init(reinterpret_cast<zxio_storage_t*>(&zs->pipe), std::move(socket), info);
}
enum class zxio_stream_socket_state_t {
UNCONNECTED,
LISTENING,
CONNECTING,
CONNECTED,
};
// A |zxio_t| backend that uses a fuchsia.posix.socket.StreamSocket object.
using zxio_stream_socket_t = struct zxio_stream_socket {
zxio_t io;
zxio_pipe_t pipe;
std::mutex state_lock;
zxio_stream_socket_state_t state __TA_GUARDED(state_lock);
fidl::WireSyncClient<fuchsia_posix_socket::StreamSocket> client;
};
static_assert(sizeof(zxio_stream_socket_t) <= sizeof(zxio_storage_t),
"zxio_stream_socket_t must fit inside zxio_storage_t.");
static zxio_stream_socket_t& zxio_stream_socket(zxio_t* io) {
return *reinterpret_cast<zxio_stream_socket_t*>(io);
}
struct stream_socket : public socket_with_zx_socket<fidl::WireSyncClient<fsocket::StreamSocket>> {
public:
explicit stream_socket(zxio_stream_socket_t& stream_socket)
: socket_with_zx_socket(stream_socket.client), stream_socket_(stream_socket) {}
void wait_begin(zxio_signals_t zxio_signals, zx_handle_t* handle, zx_signals_t* out_signals) {
zxio_signals_t pipe_signals = ZXIO_SIGNAL_PEER_CLOSED;
auto [state, has_error] = GetState();
switch (state) {
case zxio_stream_socket_state_t::UNCONNECTED:
// 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 zxio_stream_socket_state_t::LISTENING:
break;
case zxio_stream_socket_state_t::CONNECTING:
if (zxio_signals & ZXIO_SIGNAL_READABLE) {
pipe_signals |= ZXIO_SIGNAL_READABLE;
}
break;
case zxio_stream_socket_state_t::CONNECTED:
if (zxio_signals & ZXIO_SIGNAL_READABLE) {
pipe_signals |= ZXIO_SIGNAL_READABLE | ZXIO_SIGNAL_READ_DISABLED;
}
if (zxio_signals & ZXIO_SIGNAL_WRITABLE) {
pipe_signals |= ZXIO_SIGNAL_WRITABLE | ZXIO_SIGNAL_WRITE_DISABLED;
}
if (zxio_signals & ZXIO_SIGNAL_READ_DISABLED) {
pipe_signals |= ZXIO_SIGNAL_READ_DISABLED;
}
zxio_wait_begin(&stream_socket_.pipe.io, pipe_signals, handle, out_signals);
return;
}
if (zxio_signals & ZXIO_SIGNAL_WRITABLE) {
pipe_signals |= ZXIO_SIGNAL_WRITE_DISABLED;
}
if (zxio_signals & (ZXIO_SIGNAL_READABLE | ZXIO_SIGNAL_READ_DISABLED)) {
pipe_signals |= ZXIO_SIGNAL_READ_DISABLED;
}
zx_signals_t zx_signals = ZX_SIGNAL_NONE;
zxio_wait_begin(&stream_socket_.pipe.io, pipe_signals, handle, &zx_signals);
if (zxio_signals & ZXIO_SIGNAL_WRITABLE) {
// signal when connect() operation is finished.
zx_signals |= fsocket::wire::kSignalStreamConnected;
}
if (zxio_signals & ZXIO_SIGNAL_READABLE) {
// signal when a listening socket gets an incoming connection.
zx_signals |= fsocket::wire::kSignalStreamIncoming;
}
*out_signals = zx_signals;
}
void wait_end(zx_signals_t zx_signals, zxio_signals_t* out_zxio_signals) {
zxio_signals_t zxio_signals = ZXIO_SIGNAL_NONE;
bool use_pipe;
{
std::lock_guard lock(stream_socket_.state_lock);
auto [state, has_error] = StateLocked();
switch (state) {
case zxio_stream_socket_state_t::UNCONNECTED:
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_zxio_signals = ZXIO_SIGNAL_WRITABLE | ZXIO_SIGNAL_PEER_CLOSED;
use_pipe = false;
return;
case zxio_stream_socket_state_t::LISTENING:
if (zx_signals & fsocket::wire::kSignalStreamIncoming) {
zxio_signals |= ZXIO_SIGNAL_READABLE;
}
use_pipe = false;
break;
case zxio_stream_socket_state_t::CONNECTING:
if (zx_signals & fsocket::wire::kSignalStreamConnected) {
stream_socket_.state = zxio_stream_socket_state_t::CONNECTED;
zxio_signals |= ZXIO_SIGNAL_WRITABLE;
}
zx_signals &= ~fsocket::wire::kSignalStreamConnected;
use_pipe = false;
break;
case zxio_stream_socket_state_t::CONNECTED:
use_pipe = true;
break;
}
}
zxio_signals_t pipe_signals = ZXIO_SIGNAL_NONE;
zxio_wait_end(&stream_socket_.pipe.io, zx_signals, &pipe_signals);
if (use_pipe) {
zxio_signals |= pipe_signals;
if (zxio_signals & (ZXIO_SIGNAL_PEER_CLOSED | ZXIO_SIGNAL_READ_DISABLED)) {
zxio_signals |= ZXIO_SIGNAL_READABLE;
}
if (zxio_signals & ZXIO_SIGNAL_WRITE_DISABLED) {
zxio_signals |= ZXIO_SIGNAL_WRITABLE;
}
if (zxio_signals & ZXIO_SIGNAL_PEER_CLOSED) {
zxio_signals |= ZXIO_SIGNAL_READ_DISABLED;
}
}
if (pipe_signals & ZXIO_SIGNAL_PEER_CLOSED) {
zxio_signals |= ZXIO_SIGNAL_READABLE | ZXIO_SIGNAL_WRITABLE | ZXIO_SIGNAL_ERROR |
ZXIO_SIGNAL_PEER_CLOSED | ZXIO_SIGNAL_READ_DISABLED;
}
if (pipe_signals & ZXIO_SIGNAL_WRITE_DISABLED) {
zxio_signals |= ZXIO_SIGNAL_PEER_CLOSED | ZXIO_SIGNAL_WRITABLE;
}
if (pipe_signals & ZXIO_SIGNAL_READ_DISABLED) {
zxio_signals |= ZXIO_SIGNAL_READ_DISABLED | ZXIO_SIGNAL_READABLE;
}
*out_zxio_signals = zxio_signals;
}
zx_status_t recvmsg(struct msghdr* msg, int flags, size_t* out_actual, int16_t* out_code) {
std::optional preflight = Preflight(ENOTCONN);
if (preflight.has_value()) {
ErrOrOutCode err = preflight.value();
if (err.is_error()) {
return err.status_value();
}
*out_code = err.value();
return ZX_OK;
}
std::optional read_error =
GetZxSocketReadError(zxio_recvmsg_inner(&stream_socket_.io, msg, flags, out_actual));
if (read_error.has_value()) {
zx::result err = read_error.value();
if (!err.is_error()) {
*out_code = err.value();
if (err.value() == 0) {
*out_actual = 0;
}
}
return err.status_value();
}
if (msg->msg_name) {
msg->msg_namelen = 0;
}
*out_code = 0;
return ZX_OK;
}
zx_status_t sendmsg(const struct msghdr* msg, int flags, size_t* out_actual, int16_t* out_code) {
std::optional preflight = Preflight(EPIPE);
if (preflight.has_value()) {
ErrOrOutCode err = preflight.value();
if (err.is_error()) {
return err.status_value();
}
*out_code = 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.
// TODO(https://fxbug.dev/42061949) Add tests with msg as nullptr.
if (msg == nullptr) {
*out_code = EFAULT;
return ZX_OK;
}
const msghdr& msghdr_ref = *msg;
fidl::Arena allocator;
fit::result cmsg_result =
ParseControlMessages<fsocket::wire::SocketSendControlData>(allocator, msghdr_ref);
if (cmsg_result.is_error()) {
*out_code = cmsg_result.error_value();
return ZX_OK;
}
std::optional write_error =
GetZxSocketWriteError(zxio_sendmsg_inner(&stream_socket_.io, msg, flags, out_actual));
if (write_error.has_value()) {
zx::result err = write_error.value();
if (!err.is_error()) {
*out_code = err.value();
}
return err.status_value();
}
*out_code = 0;
return ZX_OK;
}
private:
std::optional<ErrOrOutCode> Preflight(int fallback) {
auto [state, has_error] = GetState();
if (has_error) {
zx::result err = GetError();
if (err.is_error()) {
return err.take_error();
}
if (int16_t value = err.value(); value != 0) {
return zx::ok(value);
}
// Error was consumed.
}
switch (state) {
case zxio_stream_socket_state_t::UNCONNECTED:
__FALLTHROUGH;
case zxio_stream_socket_state_t::LISTENING:
return zx::ok(static_cast<int16_t>(fallback));
case zxio_stream_socket_state_t::CONNECTING:
if (!has_error) {
return zx::ok(static_cast<int16_t>(EAGAIN));
}
// There's an error on the socket, we will discover it when we perform our I/O.
__FALLTHROUGH;
case zxio_stream_socket_state_t::CONNECTED:
return std::nullopt;
}
}
ErrOrOutCode GetError() override {
fidl::WireResult response = stream_socket_.client->GetError();
if (!response.ok()) {
return zx::error(response.status());
}
const auto& result = response.value();
if (result.is_error()) {
return zx::ok(static_cast<int16_t>(result.error_value()));
}
return zx::ok(static_cast<int16_t>(0));
}
std::pair<zxio_stream_socket_state_t, bool> StateLocked()
__TA_REQUIRES(stream_socket_.state_lock) {
switch (stream_socket_.state) {
case zxio_stream_socket_state_t::UNCONNECTED:
__FALLTHROUGH;
case zxio_stream_socket_state_t::LISTENING:
return std::make_pair(stream_socket_.state, false);
case zxio_stream_socket_state_t::CONNECTING: {
zx_signals_t observed;
zx_status_t status = stream_socket_.pipe.socket.wait_one(
fsocket::wire::kSignalStreamConnected, zx::time::infinite_past(), &observed);
switch (status) {
case ZX_OK:
if (observed & fsocket::wire::kSignalStreamConnected) {
stream_socket_.state = zxio_stream_socket_state_t::CONNECTED;
}
__FALLTHROUGH;
case ZX_ERR_TIMED_OUT:
return std::make_pair(stream_socket_.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 zxio_stream_socket_state_t::CONNECTED:
return std::make_pair(stream_socket_.state, false);
}
}
std::pair<zxio_stream_socket_state_t, bool> GetState() __TA_EXCLUDES(stream_socket_.state_lock) {
std::lock_guard lock(stream_socket_.state_lock);
return StateLocked();
}
zxio_stream_socket_t& stream_socket_;
};
static constexpr zxio_ops_t zxio_stream_socket_ops = []() {
zxio_ops_t ops = zxio_default_socket_ops;
ops.attr_get = AttrGet<ZXIO_OBJECT_TYPE_STREAM_SOCKET>;
ops.close = [](zxio_t* io, const bool should_wait) {
zxio_stream_socket_t& zs = zxio_stream_socket(io);
zx_status_t status = ZX_OK;
if (zs.client.is_valid() && should_wait) {
status = base_socket(zs.client).CloseSocket();
}
zs.~zxio_stream_socket_t();
return status;
};
ops.release = [](zxio_t* io, zx_handle_t* out_handle) {
if (out_handle == nullptr) {
return ZX_ERR_INVALID_ARGS;
}
*out_handle = zxio_stream_socket(io).client.TakeClientEnd().TakeChannel().release();
return ZX_OK;
};
ops.borrow = [](zxio_t* io, zx_handle_t* out_handle) {
*out_handle = zxio_stream_socket(io).client.client_end().borrow().channel()->get();
return ZX_OK;
};
ops.clone = [](zxio_t* io, zx_handle_t* out_handle) {
return base_socket(zxio_stream_socket(io).client).CloneSocket(out_handle);
};
ops.wait_begin = [](zxio_t* io, zxio_signals_t zxio_signals, zx_handle_t* out_handle,
zx_signals_t* out_zx_signals) {
stream_socket(zxio_stream_socket(io)).wait_begin(zxio_signals, out_handle, out_zx_signals);
};
ops.wait_end = [](zxio_t* io, zx_signals_t zx_signals, zxio_signals_t* out_zxio_signals) {
stream_socket(zxio_stream_socket(io)).wait_end(zx_signals, out_zxio_signals);
};
ops.readv = [](zxio_t* io, const zx_iovec_t* vector, size_t vector_count, zxio_flags_t flags,
size_t* out_actual) {
zx::socket& socket = zxio_stream_socket(io).pipe.socket;
if (flags & ZXIO_PEEK) {
uint32_t zx_flags = ZX_SOCKET_PEEK;
flags &= ~ZXIO_PEEK;
if (flags) {
return ZX_ERR_NOT_SUPPORTED;
}
size_t total = 0;
for (size_t i = 0; i < vector_count; ++i) {
total += vector[i].capacity;
}
std::unique_ptr<uint8_t[]> buf(new uint8_t[total]);
size_t actual;
zx_status_t status = socket.read(zx_flags, buf.get(), total, &actual);
if (status != ZX_OK) {
return status;
}
uint8_t* data = buf.get();
size_t remaining = actual;
return zxio_do_vector(
vector, vector_count, out_actual,
[&](void* buffer, size_t capacity, size_t total_so_far, size_t* out_actual) {
size_t actual = std::min(capacity, remaining);
memcpy(buffer, data, actual);
data += actual;
remaining -= actual;
*out_actual = actual;
return ZX_OK;
});
}
if (flags) {
return ZX_ERR_NOT_SUPPORTED;
}
return zxio_stream_do_vector(vector, vector_count, out_actual,
[&](void* buffer, size_t capacity, size_t* out_actual) {
return socket.read(0, buffer, capacity, out_actual);
});
};
ops.writev = [](zxio_t* io, const zx_iovec_t* vector, size_t vector_count, zxio_flags_t flags,
size_t* out_actual) {
return zxio_writev(&zxio_stream_socket(io).pipe.io, vector, vector_count, flags, out_actual);
};
ops.get_read_buffer_available = [](zxio_t* io, size_t* out_available) {
return zxio_get_read_buffer_available(&zxio_stream_socket(io).pipe.io, out_available);
};
ops.shutdown = [](zxio_t* io, zxio_shutdown_options_t options, int16_t* out_code) {
return network_socket(zxio_stream_socket(io).client).shutdown(options, out_code);
};
ops.bind = [](zxio_t* io, const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) {
return network_socket(zxio_stream_socket(io).client).bind(addr, addrlen, out_code);
};
ops.connect = [](zxio_t* io, const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) {
zx_status_t status =
network_socket(zxio_stream_socket(io).client).connect(addr, addrlen, out_code);
if (status == ZX_OK) {
std::lock_guard lock(zxio_stream_socket(io).state_lock);
switch (*out_code) {
case 0:
zxio_stream_socket(io).state = zxio_stream_socket_state_t::CONNECTED;
break;
case EINPROGRESS:
zxio_stream_socket(io).state = zxio_stream_socket_state_t::CONNECTING;
break;
}
}
return status;
};
ops.listen = [](zxio_t* io, int backlog, int16_t* out_code) {
auto response =
zxio_stream_socket(io).client->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(zxio_stream_socket(io).state_lock);
zxio_stream_socket(io).state = zxio_stream_socket_state_t::LISTENING;
}
*out_code = 0;
return ZX_OK;
};
ops.accept = [](zxio_t* io, struct sockaddr* addr, socklen_t* addrlen,
zxio_storage_t* out_storage, int16_t* out_code) {
bool want_addr = addr != nullptr && addrlen != nullptr;
auto response = zxio_stream_socket(io).client->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;
auto const& out = result.value()->addr;
// Result address is not provided by the server (when want_addr is false).
if (want_addr && out.has_value()) {
*addrlen = static_cast<socklen_t>(fidl_to_sockaddr(out.value(), addr, *addrlen));
}
fidl::ClientEnd<fsocket::StreamSocket>& control = result.value()->s;
fidl::WireResult describe_result = fidl::WireCall(control)->Describe();
if (!describe_result.ok()) {
return describe_result.status();
}
fidl::WireResponse describe_response = describe_result.value();
if (!describe_response.has_socket()) {
return ZX_ERR_NOT_SUPPORTED;
}
zx::socket& socket = describe_response.socket();
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 status;
}
if (zx_status_t status = zxio_stream_socket_init(out_storage, std::move(socket), info,
/*is_connected=*/true, std::move(control));
status != ZX_OK) {
return status;
}
return ZX_OK;
};
ops.getsockname = [](zxio_t* io, struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) {
return network_socket(zxio_stream_socket(io).client).getsockname(addr, addrlen, out_code);
};
ops.getpeername = [](zxio_t* io, struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) {
return network_socket(zxio_stream_socket(io).client).getpeername(addr, addrlen, out_code);
};
ops.getsockopt = [](zxio_t* io, int level, int optname, void* optval, socklen_t* optlen,
int16_t* out_code) {
SockOptResult result = network_socket(zxio_stream_socket(io).client)
.getsockopt_fidl(level, optname, optval, optlen);
*out_code = result.err;
return result.status;
};
ops.setsockopt = [](zxio_t* io, int level, int optname, const void* optval, socklen_t optlen,
int16_t* out_code) {
SockOptResult result = network_socket(zxio_stream_socket(io).client)
.setsockopt_fidl(level, optname, optval, optlen);
*out_code = result.err;
return result.status;
};
ops.recvmsg = [](zxio_t* io, struct msghdr* msg, int flags, size_t* out_actual,
int16_t* out_code) {
return stream_socket(zxio_stream_socket(io)).recvmsg(msg, flags, out_actual, out_code);
};
ops.sendmsg = [](zxio_t* io, const struct msghdr* msg, int flags, size_t* out_actual,
int16_t* out_code) {
return stream_socket(zxio_stream_socket(io)).sendmsg(msg, flags, out_actual, out_code);
};
return ops;
}();
zx_status_t zxio_stream_socket_init(zxio_storage_t* storage, zx::socket socket,
const zx_info_socket_t& info, const bool is_connected,
fidl::ClientEnd<fsocket::StreamSocket> client) {
zxio_stream_socket_state_t state = is_connected ? zxio_stream_socket_state_t::CONNECTED
: zxio_stream_socket_state_t::UNCONNECTED;
auto zs = new (storage) zxio_stream_socket_t{
.io = {},
.pipe = {},
.state_lock = {},
.state = state,
.client = fidl::WireSyncClient(std::move(client)),
};
zxio_init(&zs->io, &zxio_stream_socket_ops);
return zxio_pipe_init(reinterpret_cast<zxio_storage_t*>(&zs->pipe), std::move(socket), info);
}
static RawSocket::Storage& zxio_raw_socket(zxio_t* io) {
return *reinterpret_cast<RawSocket::Storage*>(io);
}
static constexpr zxio_ops_t zxio_raw_socket_ops = []() {
zxio_ops_t ops = zxio_default_socket_ops;
ops.attr_get = AttrGet<ZXIO_OBJECT_TYPE_RAW_SOCKET>;
ops.close = [](zxio_t* io, const bool should_wait) {
RawSocket::Storage& zs = zxio_raw_socket(io);
zx_status_t status = ZX_OK;
if (zs.client.is_valid() && should_wait) {
status = base_socket(zs.client).CloseSocket();
}
zs.~Storage();
return status;
};
ops.release = [](zxio_t* io, zx_handle_t* out_handle) {
if (out_handle == nullptr) {
return ZX_ERR_INVALID_ARGS;
}
*out_handle = zxio_raw_socket(io).client.TakeClientEnd().TakeChannel().release();
return ZX_OK;
};
ops.borrow = [](zxio_t* io, zx_handle_t* out_handle) {
*out_handle = zxio_raw_socket(io).client.client_end().borrow().channel()->get();
return ZX_OK;
};
ops.clone = [](zxio_t* io, zx_handle_t* out_handle) {
RawSocket::Storage& zs = zxio_raw_socket(io);
zx_status_t status = base_socket(zs.client).CloneSocket(out_handle);
return status;
};
ops.bind = [](zxio_t* io, const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) {
return network_socket(zxio_raw_socket(io).client).bind(addr, addrlen, out_code);
};
ops.connect = [](zxio_t* io, const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) {
return network_socket(zxio_raw_socket(io).client).connect(addr, addrlen, out_code);
};
ops.getsockname = [](zxio_t* io, struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) {
return network_socket(zxio_raw_socket(io).client).getsockname(addr, addrlen, out_code);
};
ops.getpeername = [](zxio_t* io, struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) {
return network_socket(zxio_raw_socket(io).client).getpeername(addr, addrlen, out_code);
};
ops.getsockopt = [](zxio_t* io, 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(zxio_raw_socket(io).client->GetIcmpv6Filter(),
[](const auto& response) { return response.filter; });
}
break;
case SOL_IPV6:
switch (optname) {
case IPV6_CHECKSUM:
return proc.Process(
zxio_raw_socket(io).client->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(zxio_raw_socket(io).client->GetIpHeaderIncluded(),
[](const auto& response) { return response.value; });
}
break;
}
return network_socket(zxio_raw_socket(io).client)
.getsockopt_fidl(level, optname, optval, optlen);
}();
*out_code = result.err;
return result.status;
};
ops.getsockopt = [](zxio_t* io, 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(zxio_raw_socket(io).client->GetIcmpv6Filter(),
[](const auto& response) { return response.filter; });
}
break;
case SOL_IPV6:
switch (optname) {
case IPV6_CHECKSUM:
return proc.Process(
zxio_raw_socket(io).client->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(zxio_raw_socket(io).client->GetIpHeaderIncluded(),
[](const auto& response) { return response.value; });
}
break;
}
return network_socket(zxio_raw_socket(io).client)
.getsockopt_fidl(level, optname, optval, optlen);
}();
*out_code = result.err;
return result.status;
};
ops.setsockopt = [](zxio_t* io, 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>(
[io](frawsocket::wire::Icmpv6Filter value) {
return zxio_raw_socket(io).client->SetIcmpv6Filter(value);
});
}
break;
case SOL_IPV6:
switch (optname) {
case IPV6_CHECKSUM:
return proc.Process<int32_t>([io](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 zxio_raw_socket(io).client->SetIpv6Checksum(config);
});
}
break;
case SOL_IP:
switch (optname) {
case IP_HDRINCL:
return proc.Process<bool>([io](bool value) {
return zxio_raw_socket(io).client->SetIpHeaderIncluded(value);
});
}
break;
}
return network_socket(zxio_raw_socket(io).client)
.setsockopt_fidl(level, optname, optval, optlen);
}();
*out_code = result.err;
return result.status;
};
ops.recvmsg = [](zxio_t* io, struct msghdr* msg, int flags, size_t* out_actual,
int16_t* out_code) {
return socket_with_event<RawSocket>(zxio_raw_socket(io))
.recvmsg(msg, flags, out_actual, out_code);
};
ops.sendmsg = [](zxio_t* io, const struct msghdr* msg, int flags, size_t* out_actual,
int16_t* out_code) {
return socket_with_event<RawSocket>(zxio_raw_socket(io))
.sendmsg(msg, flags, out_actual, out_code);
};
ops.wait_begin = [](zxio_t* io, zxio_signals_t zxio_signals, zx_handle_t* handle,
zx_signals_t* out_signals) {
return socket_with_event<RawSocket>(zxio_raw_socket(io))
.wait_begin(zxio_signals, handle, out_signals);
};
ops.wait_end = [](zxio_t* io, zx_signals_t zx_signals, zxio_signals_t* out_zxio_signals) {
return socket_with_event<RawSocket>(zxio_raw_socket(io)).wait_end(zx_signals, out_zxio_signals);
};
ops.shutdown = [](zxio_t* io, zxio_shutdown_options_t options, int16_t* out_code) {
return network_socket(zxio_raw_socket(io).client).shutdown((options), out_code);
};
return ops;
}();
zx_status_t zxio_raw_socket_init(zxio_storage_t* storage, zx::eventpair event,
fidl::ClientEnd<frawsocket::Socket> client) {
auto zs = new (storage) RawSocket::Storage{
.io = storage->io,
.event = std::move(event),
.client = fidl::WireSyncClient(std::move(client)),
};
zxio_init(&zs->io, &zxio_raw_socket_ops);
return ZX_OK;
}
static PacketSocket::Storage& zxio_packet_socket(zxio_t* io) {
return *reinterpret_cast<PacketSocket::Storage*>(io);
}
static constexpr zxio_ops_t zxio_packet_socket_ops = []() {
zxio_ops_t ops = zxio_default_socket_ops;
ops.attr_get = AttrGet<ZXIO_OBJECT_TYPE_PACKET_SOCKET>;
ops.close = [](zxio_t* io, const bool should_wait) {
PacketSocket::Storage& zs = zxio_packet_socket(io);
zx_status_t status = ZX_OK;
if (zs.client.is_valid() && should_wait) {
status = base_socket(zs.client).CloseSocket();
}
zs.~Storage();
return status;
};
ops.release = [](zxio_t* io, zx_handle_t* out_handle) {
if (out_handle == nullptr) {
return ZX_ERR_INVALID_ARGS;
}
*out_handle = zxio_packet_socket(io).client.TakeClientEnd().TakeChannel().release();
return ZX_OK;
};
ops.borrow = [](zxio_t* io, zx_handle_t* out_handle) {
*out_handle = zxio_packet_socket(io).client.client_end().borrow().channel()->get();
return ZX_OK;
};
ops.clone = [](zxio_t* io, zx_handle_t* out_handle) {
PacketSocket::Storage& zs = zxio_packet_socket(io);
zx_status_t status = base_socket(zs.client).CloneSocket(out_handle);
return status;
};
ops.bind = [](zxio_t* io, const struct sockaddr* addr, socklen_t addrlen, int16_t* out_code) {
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 =
zxio_packet_socket(io).client->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;
};
ops.getsockname = [](zxio_t* io, struct sockaddr* addr, socklen_t* addrlen, int16_t* out_code) {
if (addrlen == nullptr || (*addrlen != 0 && addr == nullptr)) {
*out_code = EFAULT;
return ZX_OK;
}
const fidl::WireResult response = zxio_packet_socket(io).client->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;
};
ops.getsockopt = [](zxio_t* io, int level, int optname, void* optval, socklen_t* optlen,
int16_t* out_code) {
SockOptResult result = [&]() {
switch (level) {
case SOL_SOCKET:
return base_socket(zxio_packet_socket(io).client)
.get_solsocket_sockopt_fidl(optname, optval, optlen);
default:
return SockOptResult::Errno(ENOPROTOOPT);
}
}();
*out_code = result.err;
return result.status;
};
ops.setsockopt = [](zxio_t* io, int level, int optname, const void* optval, socklen_t optlen,
int16_t* out_code) {
SockOptResult result = [&]() {
switch (level) {
case SOL_SOCKET:
return base_socket(zxio_packet_socket(io).client)
.set_solsocket_sockopt_fidl(optname, optval, optlen);
default:
return SockOptResult::Errno(ENOPROTOOPT);
}
}();
*out_code = result.err;
return result.status;
};
ops.recvmsg = [](zxio_t* io, struct msghdr* msg, int flags, size_t* out_actual,
int16_t* out_code) {
return socket_with_event<PacketSocket>(zxio_packet_socket(io))
.recvmsg(msg, flags, out_actual, out_code);
};
ops.sendmsg = [](zxio_t* io, const struct msghdr* msg, int flags, size_t* out_actual,
int16_t* out_code) {
return socket_with_event<PacketSocket>(zxio_packet_socket(io))
.sendmsg(msg, flags, out_actual, out_code);
};
ops.wait_begin = [](zxio_t* io, zxio_signals_t zxio_signals, zx_handle_t* handle,
zx_signals_t* out_signals) {
return socket_with_event<PacketSocket>(zxio_packet_socket(io))
.wait_begin(zxio_signals, handle, out_signals);
};
ops.wait_end = [](zxio_t* io, zx_signals_t zx_signals, zxio_signals_t* out_zxio_signals) {
return socket_with_event<PacketSocket>(zxio_packet_socket(io))
.wait_end(zx_signals, out_zxio_signals);
};
return ops;
}();
zx_status_t zxio_packet_socket_init(zxio_storage_t* storage, zx::eventpair event,
fidl::ClientEnd<fpacketsocket::Socket> client) {
auto zs = new (storage) PacketSocket::Storage{
.io = storage->io,
.event = std::move(event),
.client = fidl::WireSyncClient(std::move(client)),
};
zxio_init(&zs->io, &zxio_packet_socket_ops);
return ZX_OK;
}