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mod.rs
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//! Socket interface functions
//!
//! [Further reading](https://man7.org/linux/man-pages/man7/socket.7.html)
#[cfg(any(target_os = "freebsd", linux_android))]
#[cfg(feature = "uio")]
use crate::sys::time::TimeSpec;
#[cfg(not(target_os = "redox"))]
#[cfg(feature = "uio")]
use crate::sys::time::TimeVal;
use crate::{errno::Errno, Result};
use cfg_if::cfg_if;
use libc::{self, c_int, size_t, socklen_t};
#[cfg(all(feature = "uio", not(target_os = "redox")))]
use libc::{
c_void, iovec, CMSG_DATA, CMSG_FIRSTHDR, CMSG_LEN, CMSG_NXTHDR, CMSG_SPACE,
};
#[cfg(not(target_os = "redox"))]
use std::io::{IoSlice, IoSliceMut};
#[cfg(feature = "net")]
use std::net;
use std::os::unix::io::{AsFd, AsRawFd, FromRawFd, OwnedFd, RawFd};
use std::{mem, ptr};
#[deny(missing_docs)]
mod addr;
#[deny(missing_docs)]
pub mod sockopt;
/*
*
* ===== Re-exports =====
*
*/
pub use self::addr::{SockaddrLike, SockaddrStorage};
#[cfg(solarish)]
pub use self::addr::{AddressFamily, UnixAddr};
#[cfg(not(solarish))]
pub use self::addr::{AddressFamily, UnixAddr};
#[cfg(not(any(solarish, target_os = "haiku", target_os = "redox")))]
#[cfg(feature = "net")]
pub use self::addr::{LinkAddr, SockaddrIn, SockaddrIn6};
#[cfg(any(solarish, target_os = "haiku", target_os = "redox"))]
#[cfg(feature = "net")]
pub use self::addr::{SockaddrIn, SockaddrIn6};
#[cfg(linux_android)]
pub use crate::sys::socket::addr::alg::AlgAddr;
#[cfg(linux_android)]
pub use crate::sys::socket::addr::netlink::NetlinkAddr;
#[cfg(apple_targets)]
#[cfg(feature = "ioctl")]
pub use crate::sys::socket::addr::sys_control::SysControlAddr;
#[cfg(any(linux_android, apple_targets))]
pub use crate::sys::socket::addr::vsock::VsockAddr;
#[cfg(all(feature = "uio", not(target_os = "redox")))]
pub use libc::{cmsghdr, msghdr};
pub use libc::{sa_family_t, sockaddr, sockaddr_storage, sockaddr_un};
#[cfg(feature = "net")]
pub use libc::{sockaddr_in, sockaddr_in6};
#[cfg(feature = "net")]
use crate::sys::socket::addr::{ipv4addr_to_libc, ipv6addr_to_libc};
/// These constants are used to specify the communication semantics
/// when creating a socket with [`socket()`](fn.socket.html)
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
#[repr(i32)]
#[non_exhaustive]
pub enum SockType {
/// Provides sequenced, reliable, two-way, connection-
/// based byte streams. An out-of-band data transmission
/// mechanism may be supported.
Stream = libc::SOCK_STREAM,
/// Supports datagrams (connectionless, unreliable
/// messages of a fixed maximum length).
Datagram = libc::SOCK_DGRAM,
/// Provides a sequenced, reliable, two-way connection-
/// based data transmission path for datagrams of fixed
/// maximum length; a consumer is required to read an
/// entire packet with each input system call.
SeqPacket = libc::SOCK_SEQPACKET,
/// Provides raw network protocol access.
#[cfg(not(target_os = "redox"))]
Raw = libc::SOCK_RAW,
/// Provides a reliable datagram layer that does not
/// guarantee ordering.
#[cfg(not(any(target_os = "haiku", target_os = "redox")))]
Rdm = libc::SOCK_RDM,
}
// The TryFrom impl could've been derived using libc_enum!. But for
// backwards-compatibility with Nix-0.25.0 we manually implement it, so as to
// keep the old variant names.
impl TryFrom<i32> for SockType {
type Error = crate::Error;
fn try_from(x: i32) -> Result<Self> {
match x {
libc::SOCK_STREAM => Ok(Self::Stream),
libc::SOCK_DGRAM => Ok(Self::Datagram),
libc::SOCK_SEQPACKET => Ok(Self::SeqPacket),
#[cfg(not(target_os = "redox"))]
libc::SOCK_RAW => Ok(Self::Raw),
#[cfg(not(any(target_os = "haiku", target_os = "redox")))]
libc::SOCK_RDM => Ok(Self::Rdm),
_ => Err(Errno::EINVAL),
}
}
}
/// Constants used in [`socket`](fn.socket.html) and [`socketpair`](fn.socketpair.html)
/// to specify the protocol to use.
#[repr(i32)]
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
#[non_exhaustive]
pub enum SockProtocol {
/// TCP protocol ([ip(7)](https://man7.org/linux/man-pages/man7/ip.7.html))
Tcp = libc::IPPROTO_TCP,
/// UDP protocol ([ip(7)](https://man7.org/linux/man-pages/man7/ip.7.html))
Udp = libc::IPPROTO_UDP,
/// Raw sockets ([raw(7)](https://man7.org/linux/man-pages/man7/raw.7.html))
Raw = libc::IPPROTO_RAW,
/// Allows applications to configure and control a KEXT
/// ([ref](https://developer.apple.com/library/content/documentation/Darwin/Conceptual/NKEConceptual/control/control.html))
#[cfg(apple_targets)]
KextControl = libc::SYSPROTO_CONTROL,
/// Receives routing and link updates and may be used to modify the routing tables (both IPv4 and IPv6), IP addresses, link
// parameters, neighbor setups, queueing disciplines, traffic classes and packet classifiers
/// ([ref](https://www.man7.org/linux/man-pages/man7/netlink.7.html))
#[cfg(linux_android)]
NetlinkRoute = libc::NETLINK_ROUTE,
/// Reserved for user-mode socket protocols
/// ([ref](https://www.man7.org/linux/man-pages/man7/netlink.7.html))
#[cfg(linux_android)]
NetlinkUserSock = libc::NETLINK_USERSOCK,
/// Query information about sockets of various protocol families from the kernel
/// ([ref](https://www.man7.org/linux/man-pages/man7/netlink.7.html))
#[cfg(linux_android)]
NetlinkSockDiag = libc::NETLINK_SOCK_DIAG,
/// Netfilter/iptables ULOG.
/// ([ref](https://www.man7.org/linux/man-pages/man7/netlink.7.html))
#[cfg(linux_android)]
NetlinkNFLOG = libc::NETLINK_NFLOG,
/// SELinux event notifications.
/// ([ref](https://www.man7.org/linux/man-pages/man7/netlink.7.html))
#[cfg(linux_android)]
NetlinkSELinux = libc::NETLINK_SELINUX,
/// Open-iSCSI
/// ([ref](https://www.man7.org/linux/man-pages/man7/netlink.7.html))
#[cfg(linux_android)]
NetlinkISCSI = libc::NETLINK_ISCSI,
/// Auditing
/// ([ref](https://www.man7.org/linux/man-pages/man7/netlink.7.html))
#[cfg(linux_android)]
NetlinkAudit = libc::NETLINK_AUDIT,
/// Access to FIB lookup from user space
/// ([ref](https://www.man7.org/linux/man-pages/man7/netlink.7.html))
#[cfg(linux_android)]
NetlinkFIBLookup = libc::NETLINK_FIB_LOOKUP,
/// Netfilter subsystem
/// ([ref](https://www.man7.org/linux/man-pages/man7/netlink.7.html))
#[cfg(linux_android)]
NetlinkNetFilter = libc::NETLINK_NETFILTER,
/// SCSI Transports
/// ([ref](https://www.man7.org/linux/man-pages/man7/netlink.7.html))
#[cfg(linux_android)]
NetlinkSCSITransport = libc::NETLINK_SCSITRANSPORT,
/// Infiniband RDMA
/// ([ref](https://www.man7.org/linux/man-pages/man7/netlink.7.html))
#[cfg(linux_android)]
NetlinkRDMA = libc::NETLINK_RDMA,
/// Transport IPv6 packets from netfilter to user space. Used by ip6_queue kernel module.
/// ([ref](https://www.man7.org/linux/man-pages/man7/netlink.7.html))
#[cfg(linux_android)]
NetlinkIPv6Firewall = libc::NETLINK_IP6_FW,
/// DECnet routing messages
/// ([ref](https://www.man7.org/linux/man-pages/man7/netlink.7.html))
#[cfg(linux_android)]
NetlinkDECNetRoutingMessage = libc::NETLINK_DNRTMSG,
/// Kernel messages to user space
/// ([ref](https://www.man7.org/linux/man-pages/man7/netlink.7.html))
#[cfg(linux_android)]
NetlinkKObjectUEvent = libc::NETLINK_KOBJECT_UEVENT,
/// Generic netlink family for simplified netlink usage.
/// ([ref](https://www.man7.org/linux/man-pages/man7/netlink.7.html))
#[cfg(linux_android)]
NetlinkGeneric = libc::NETLINK_GENERIC,
/// Netlink interface to request information about ciphers registered with the kernel crypto API as well as allow
/// configuration of the kernel crypto API.
/// ([ref](https://www.man7.org/linux/man-pages/man7/netlink.7.html))
#[cfg(linux_android)]
NetlinkCrypto = libc::NETLINK_CRYPTO,
/// Non-DIX type protocol number defined for the Ethernet IEEE 802.3 interface that allows packets of all protocols
/// defined in the interface to be received.
/// ([ref](https://man7.org/linux/man-pages/man7/packet.7.html))
// The protocol number is fed into the socket syscall in network byte order.
#[cfg(linux_android)]
EthAll = (libc::ETH_P_ALL as u16).to_be() as i32,
/// ICMP protocol ([icmp(7)](https://man7.org/linux/man-pages/man7/icmp.7.html))
Icmp = libc::IPPROTO_ICMP,
/// ICMPv6 protocol (ICMP over IPv6)
IcmpV6 = libc::IPPROTO_ICMPV6,
}
impl SockProtocol {
/// The Controller Area Network raw socket protocol
/// ([ref](https://docs.kernel.org/networking/can.html#how-to-use-socketcan))
#[cfg(target_os = "linux")]
#[allow(non_upper_case_globals)]
pub const CanRaw: SockProtocol = SockProtocol::Icmp; // Matches libc::CAN_RAW
/// The Controller Area Network broadcast manager protocol
/// ([ref](https://docs.kernel.org/networking/can.html#how-to-use-socketcan))
#[cfg(target_os = "linux")]
#[allow(non_upper_case_globals)]
pub const CanBcm: SockProtocol = SockProtocol::NetlinkUserSock; // Matches libc::CAN_BCM
/// Allows applications and other KEXTs to be notified when certain kernel events occur
/// ([ref](https://developer.apple.com/library/content/documentation/Darwin/Conceptual/NKEConceptual/control/control.html))
#[cfg(apple_targets)]
#[allow(non_upper_case_globals)]
pub const KextEvent: SockProtocol = SockProtocol::Icmp; // Matches libc::SYSPROTO_EVENT
}
#[cfg(linux_android)]
libc_bitflags! {
/// Configuration flags for `SO_TIMESTAMPING` interface
///
/// For use with [`Timestamping`][sockopt::Timestamping].
/// [Further reading](https://www.kernel.org/doc/html/latest/networking/timestamping.html)
pub struct TimestampingFlag: libc::c_uint {
/// Report any software timestamps when available.
SOF_TIMESTAMPING_SOFTWARE;
/// Report hardware timestamps as generated by SOF_TIMESTAMPING_TX_HARDWARE when available.
SOF_TIMESTAMPING_RAW_HARDWARE;
/// Collect transmitting timestamps as reported by hardware
SOF_TIMESTAMPING_TX_HARDWARE;
/// Collect transmitting timestamps as reported by software
SOF_TIMESTAMPING_TX_SOFTWARE;
/// Collect receiving timestamps as reported by hardware
SOF_TIMESTAMPING_RX_HARDWARE;
/// Collect receiving timestamps as reported by software
SOF_TIMESTAMPING_RX_SOFTWARE;
/// Generate a unique identifier along with each transmitted packet
SOF_TIMESTAMPING_OPT_ID;
/// Return transmit timestamps alongside an empty packet instead of the original packet
SOF_TIMESTAMPING_OPT_TSONLY;
}
}
libc_bitflags! {
/// Additional socket options
pub struct SockFlag: c_int {
/// Set non-blocking mode on the new socket
#[cfg(any(linux_android,
freebsdlike,
netbsdlike,
target_os = "illumos"))]
SOCK_NONBLOCK;
/// Set close-on-exec on the new descriptor
#[cfg(any(linux_android,
freebsdlike,
netbsdlike,
target_os = "illumos"))]
SOCK_CLOEXEC;
/// Return `EPIPE` instead of raising `SIGPIPE`
#[cfg(target_os = "netbsd")]
SOCK_NOSIGPIPE;
/// For domains `AF_INET(6)`, only allow `connect(2)`, `sendto(2)`, or `sendmsg(2)`
/// to the DNS port (typically 53)
#[cfg(target_os = "openbsd")]
SOCK_DNS;
}
}
libc_bitflags! {
/// Flags for send/recv and their relatives
pub struct MsgFlags: c_int {
/// Sends or requests out-of-band data on sockets that support this notion
/// (e.g., of type [`Stream`](enum.SockType.html)); the underlying protocol must also
/// support out-of-band data.
MSG_OOB;
/// Peeks at an incoming message. The data is treated as unread and the next
/// [`recv()`](fn.recv.html)
/// or similar function shall still return this data.
MSG_PEEK;
/// Receive operation blocks until the full amount of data can be
/// returned. The function may return smaller amount of data if a signal
/// is caught, an error or disconnect occurs.
MSG_WAITALL;
/// Enables nonblocking operation; if the operation would block,
/// `EAGAIN` or `EWOULDBLOCK` is returned. This provides similar
/// behavior to setting the `O_NONBLOCK` flag
/// (via the [`fcntl`](../../fcntl/fn.fcntl.html)
/// `F_SETFL` operation), but differs in that `MSG_DONTWAIT` is a per-
/// call option, whereas `O_NONBLOCK` is a setting on the open file
/// description (see [open(2)](https://man7.org/linux/man-pages/man2/open.2.html)),
/// which will affect all threads in
/// the calling process and as well as other processes that hold
/// file descriptors referring to the same open file description.
#[cfg(not(target_os = "aix"))]
MSG_DONTWAIT;
/// Receive flags: Control Data was discarded (buffer too small)
MSG_CTRUNC;
/// For raw ([`Packet`](addr/enum.AddressFamily.html)), Internet datagram
/// (since Linux 2.4.27/2.6.8),
/// netlink (since Linux 2.6.22) and UNIX datagram (since Linux 3.4)
/// sockets: return the real length of the packet or datagram, even
/// when it was longer than the passed buffer. Not implemented for UNIX
/// domain ([unix(7)](https://linux.die.net/man/7/unix)) sockets.
///
/// For use with Internet stream sockets, see [tcp(7)](https://linux.die.net/man/7/tcp).
MSG_TRUNC;
/// Terminates a record (when this notion is supported, as for
/// sockets of type [`SeqPacket`](enum.SockType.html)).
MSG_EOR;
/// This flag specifies that queued errors should be received from
/// the socket error queue. (For more details, see
/// [recvfrom(2)](https://linux.die.net/man/2/recvfrom))
#[cfg(linux_android)]
MSG_ERRQUEUE;
/// Set the `close-on-exec` flag for the file descriptor received via a UNIX domain
/// file descriptor using the `SCM_RIGHTS` operation (described in
/// [unix(7)](https://linux.die.net/man/7/unix)).
/// This flag is useful for the same reasons as the `O_CLOEXEC` flag of
/// [open(2)](https://pubs.opengroup.org/onlinepubs/9699919799/functions/open.html).
///
/// Only used in [`recvmsg`](fn.recvmsg.html) function.
#[cfg(any(linux_android, freebsdlike, netbsdlike))]
MSG_CMSG_CLOEXEC;
/// Requests not to send `SIGPIPE` errors when the other end breaks the connection.
/// (For more details, see [send(2)](https://linux.die.net/man/2/send)).
#[cfg(any(linux_android,
freebsdlike,
solarish,
netbsdlike,
target_os = "fuchsia",
target_os = "haiku"))]
MSG_NOSIGNAL;
/// Turns on [`MSG_DONTWAIT`] after the first message has been received (only for
/// `recvmmsg()`).
#[cfg(any(linux_android,
netbsdlike,
target_os = "fuchsia",
target_os = "freebsd",
target_os = "solaris"))]
MSG_WAITFORONE;
}
}
#[cfg(target_os = "freebsd")]
libc_enum! {
/// A selector for which clock to use when generating packet timestamps.
/// Used when setting [`TsClock`](crate::sys::socket::sockopt::TsClock) on a socket.
/// (For more details, see [setsockopt(2)](https://man.freebsd.org/cgi/man.cgi?setsockopt)).
#[repr(i32)]
#[non_exhaustive]
pub enum SocketTimestamp {
/// Microsecond resolution, realtime. This is the default.
SO_TS_REALTIME_MICRO,
/// Sub-nanosecond resolution, realtime.
SO_TS_BINTIME,
/// Nanosecond resolution, realtime.
SO_TS_REALTIME,
/// Nanosecond resolution, monotonic.
SO_TS_MONOTONIC,
}
}
cfg_if! {
if #[cfg(linux_android)] {
/// Unix credentials of the sending process.
///
/// This struct is used with the `SO_PEERCRED` ancillary message
/// and the `SCM_CREDENTIALS` control message for UNIX sockets.
#[repr(transparent)]
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub struct UnixCredentials(libc::ucred);
impl UnixCredentials {
/// Creates a new instance with the credentials of the current process
pub fn new() -> Self {
// Safe because these FFI functions are inherently safe
unsafe {
UnixCredentials(libc::ucred {
pid: libc::getpid(),
uid: libc::getuid(),
gid: libc::getgid()
})
}
}
/// Returns the process identifier
pub fn pid(&self) -> libc::pid_t {
self.0.pid
}
/// Returns the user identifier
pub fn uid(&self) -> libc::uid_t {
self.0.uid
}
/// Returns the group identifier
pub fn gid(&self) -> libc::gid_t {
self.0.gid
}
}
impl Default for UnixCredentials {
fn default() -> Self {
Self::new()
}
}
impl From<libc::ucred> for UnixCredentials {
fn from(cred: libc::ucred) -> Self {
UnixCredentials(cred)
}
}
impl From<UnixCredentials> for libc::ucred {
fn from(uc: UnixCredentials) -> Self {
uc.0
}
}
} else if #[cfg(freebsdlike)] {
/// Unix credentials of the sending process.
///
/// This struct is used with the `SCM_CREDS` ancillary message for UNIX sockets.
#[repr(transparent)]
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub struct UnixCredentials(libc::cmsgcred);
impl UnixCredentials {
/// Returns the process identifier
pub fn pid(&self) -> libc::pid_t {
self.0.cmcred_pid
}
/// Returns the real user identifier
pub fn uid(&self) -> libc::uid_t {
self.0.cmcred_uid
}
/// Returns the effective user identifier
pub fn euid(&self) -> libc::uid_t {
self.0.cmcred_euid
}
/// Returns the real group identifier
pub fn gid(&self) -> libc::gid_t {
self.0.cmcred_gid
}
/// Returns a list group identifiers (the first one being the effective GID)
pub fn groups(&self) -> &[libc::gid_t] {
unsafe {
std::slice::from_raw_parts(
self.0.cmcred_groups.as_ptr(),
self.0.cmcred_ngroups as _
)
}
}
}
impl From<libc::cmsgcred> for UnixCredentials {
fn from(cred: libc::cmsgcred) -> Self {
UnixCredentials(cred)
}
}
}
}
cfg_if! {
if #[cfg(any(freebsdlike, apple_targets))] {
/// Return type of [`LocalPeerCred`](crate::sys::socket::sockopt::LocalPeerCred)
#[repr(transparent)]
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub struct XuCred(libc::xucred);
impl XuCred {
/// Structure layout version
pub fn version(&self) -> u32 {
self.0.cr_version
}
/// Effective user ID
pub fn uid(&self) -> libc::uid_t {
self.0.cr_uid
}
/// Returns a list of group identifiers (the first one being the
/// effective GID)
pub fn groups(&self) -> &[libc::gid_t] {
&self.0.cr_groups
}
}
}
}
feature! {
#![feature = "net"]
/// Request for multicast socket operations
///
/// This is a wrapper type around `ip_mreq`.
#[repr(transparent)]
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub struct IpMembershipRequest(libc::ip_mreq);
impl IpMembershipRequest {
/// Instantiate a new `IpMembershipRequest`
///
/// If `interface` is `None`, then `Ipv4Addr::any()` will be used for the interface.
pub fn new(group: net::Ipv4Addr, interface: Option<net::Ipv4Addr>)
-> Self
{
let imr_addr = match interface {
None => net::Ipv4Addr::UNSPECIFIED,
Some(addr) => addr
};
IpMembershipRequest(libc::ip_mreq {
imr_multiaddr: ipv4addr_to_libc(group),
imr_interface: ipv4addr_to_libc(imr_addr)
})
}
}
/// Request for ipv6 multicast socket operations
///
/// This is a wrapper type around `ipv6_mreq`.
#[repr(transparent)]
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub struct Ipv6MembershipRequest(libc::ipv6_mreq);
impl Ipv6MembershipRequest {
/// Instantiate a new `Ipv6MembershipRequest`
pub const fn new(group: net::Ipv6Addr) -> Self {
Ipv6MembershipRequest(libc::ipv6_mreq {
ipv6mr_multiaddr: ipv6addr_to_libc(&group),
ipv6mr_interface: 0,
})
}
}
}
#[cfg(not(target_os = "redox"))]
feature! {
#![feature = "uio"]
/// Create a buffer large enough for storing some control messages as returned
/// by [`recvmsg`](fn.recvmsg.html).
///
/// # Examples
///
/// ```
/// # #[macro_use] extern crate nix;
/// # use nix::sys::time::TimeVal;
/// # use std::os::unix::io::RawFd;
/// # fn main() {
/// // Create a buffer for a `ControlMessageOwned::ScmTimestamp` message
/// let _ = cmsg_space!(TimeVal);
/// // Create a buffer big enough for a `ControlMessageOwned::ScmRights` message
/// // with two file descriptors
/// let _ = cmsg_space!([RawFd; 2]);
/// // Create a buffer big enough for a `ControlMessageOwned::ScmRights` message
/// // and a `ControlMessageOwned::ScmTimestamp` message
/// let _ = cmsg_space!(RawFd, TimeVal);
/// # }
/// ```
// Unfortunately, CMSG_SPACE isn't a const_fn, or else we could return a
// stack-allocated array.
#[macro_export]
macro_rules! cmsg_space {
( $( $x:ty ),* ) => {
{
let space = 0 $(+ $crate::sys::socket::cmsg_space::<$x>())*;
Vec::<u8>::with_capacity(space)
}
}
}
#[inline]
#[doc(hidden)]
pub fn cmsg_space<T>() -> usize {
// SAFETY: CMSG_SPACE is always safe
unsafe { libc::CMSG_SPACE(mem::size_of::<T>() as libc::c_uint) as usize }
}
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
/// Contains outcome of sending or receiving a message
///
/// Use [`cmsgs`][RecvMsg::cmsgs] to access all the control messages present, and
/// [`iovs`][RecvMsg::iovs`] to access underlying io slices.
pub struct RecvMsg<'a, 's, S> {
pub bytes: usize,
cmsghdr: Option<&'a cmsghdr>,
pub address: Option<S>,
pub flags: MsgFlags,
iobufs: std::marker::PhantomData<& 's()>,
mhdr: msghdr,
}
impl<'a, S> RecvMsg<'a, '_, S> {
/// Iterate over the valid control messages pointed to by this
/// msghdr.
pub fn cmsgs(&self) -> CmsgIterator {
CmsgIterator {
cmsghdr: self.cmsghdr,
mhdr: &self.mhdr
}
}
}
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub struct CmsgIterator<'a> {
/// Control message buffer to decode from. Must adhere to cmsg alignment.
cmsghdr: Option<&'a cmsghdr>,
mhdr: &'a msghdr
}
impl<'a> Iterator for CmsgIterator<'a> {
type Item = ControlMessageOwned;
fn next(&mut self) -> Option<ControlMessageOwned> {
match self.cmsghdr {
None => None, // No more messages
Some(hdr) => {
// Get the data.
// Safe if cmsghdr points to valid data returned by recvmsg(2)
let cm = unsafe { Some(ControlMessageOwned::decode_from(hdr))};
// Advance the internal pointer. Safe if mhdr and cmsghdr point
// to valid data returned by recvmsg(2)
self.cmsghdr = unsafe {
let p = CMSG_NXTHDR(self.mhdr as *const _, hdr as *const _);
p.as_ref()
};
cm
}
}
}
}
/// A type-safe wrapper around a single control message, as used with
/// [`recvmsg`](#fn.recvmsg).
///
/// [Further reading](https://man7.org/linux/man-pages/man3/cmsg.3.html)
// Nix version 0.13.0 and earlier used ControlMessage for both recvmsg and
// sendmsg. However, on some platforms the messages returned by recvmsg may be
// unaligned. ControlMessageOwned takes those messages by copy, obviating any
// alignment issues.
//
// See https://github.com/nix-rust/nix/issues/999
#[derive(Clone, Debug, Eq, PartialEq)]
#[non_exhaustive]
pub enum ControlMessageOwned {
/// Received version of [`ControlMessage::ScmRights`]
ScmRights(Vec<RawFd>),
/// Received version of [`ControlMessage::ScmCredentials`]
#[cfg(linux_android)]
ScmCredentials(UnixCredentials),
/// Received version of [`ControlMessage::ScmCreds`]
#[cfg(freebsdlike)]
ScmCreds(UnixCredentials),
/// A message of type `SCM_TIMESTAMP`, containing the time the
/// packet was received by the kernel.
///
/// See the kernel's explanation in "SO_TIMESTAMP" of
/// [networking/timestamping](https://www.kernel.org/doc/Documentation/networking/timestamping.txt).
///
/// # Examples
///
/// ```
/// # #[macro_use] extern crate nix;
/// # use nix::sys::socket::*;
/// # use nix::sys::time::*;
/// # use std::io::{IoSlice, IoSliceMut};
/// # use std::time::*;
/// # use std::str::FromStr;
/// # use std::os::unix::io::AsRawFd;
/// # fn main() {
/// // Set up
/// let message = "Ohayō!".as_bytes();
/// let in_socket = socket(
/// AddressFamily::Inet,
/// SockType::Datagram,
/// SockFlag::empty(),
/// None).unwrap();
/// setsockopt(&in_socket, sockopt::ReceiveTimestamp, &true).unwrap();
/// let localhost = SockaddrIn::from_str("127.0.0.1:0").unwrap();
/// bind(in_socket.as_raw_fd(), &localhost).unwrap();
/// let address: SockaddrIn = getsockname(in_socket.as_raw_fd()).unwrap();
/// // Get initial time
/// let time0 = SystemTime::now();
/// // Send the message
/// let iov = [IoSlice::new(message)];
/// let flags = MsgFlags::empty();
/// let l = sendmsg(in_socket.as_raw_fd(), &iov, &[], flags, Some(&address)).unwrap();
/// assert_eq!(message.len(), l);
/// // Receive the message
/// let mut buffer = vec![0u8; message.len()];
/// let mut cmsgspace = cmsg_space!(TimeVal);
/// let mut iov = [IoSliceMut::new(&mut buffer)];
/// let r = recvmsg::<SockaddrIn>(in_socket.as_raw_fd(), &mut iov, Some(&mut cmsgspace), flags)
/// .unwrap();
/// let rtime = match r.cmsgs().next() {
/// Some(ControlMessageOwned::ScmTimestamp(rtime)) => rtime,
/// Some(_) => panic!("Unexpected control message"),
/// None => panic!("No control message")
/// };
/// // Check the final time
/// let time1 = SystemTime::now();
/// // the packet's received timestamp should lie in-between the two system
/// // times, unless the system clock was adjusted in the meantime.
/// let rduration = Duration::new(rtime.tv_sec() as u64,
/// rtime.tv_usec() as u32 * 1000);
/// assert!(time0.duration_since(UNIX_EPOCH).unwrap() <= rduration);
/// assert!(rduration <= time1.duration_since(UNIX_EPOCH).unwrap());
/// // Close socket
/// # }
/// ```
ScmTimestamp(TimeVal),
/// A set of nanosecond resolution timestamps
///
/// [Further reading](https://www.kernel.org/doc/html/latest/networking/timestamping.html)
#[cfg(linux_android)]
ScmTimestampsns(Timestamps),
/// Nanoseconds resolution timestamp
///
/// [Further reading](https://www.kernel.org/doc/html/latest/networking/timestamping.html)
#[cfg(linux_android)]
ScmTimestampns(TimeSpec),
/// Realtime clock timestamp
///
/// [Further reading](https://man.freebsd.org/cgi/man.cgi?setsockopt)
#[cfg(target_os = "freebsd")]
ScmRealtime(TimeSpec),
/// Monotonic clock timestamp
///
/// [Further reading](https://man.freebsd.org/cgi/man.cgi?setsockopt)
#[cfg(target_os = "freebsd")]
ScmMonotonic(TimeSpec),
#[cfg(any(linux_android, apple_targets, target_os = "netbsd"))]
#[cfg(feature = "net")]
#[cfg_attr(docsrs, doc(cfg(feature = "net")))]
Ipv4PacketInfo(libc::in_pktinfo),
#[cfg(any(linux_android, bsd))]
#[cfg(feature = "net")]
#[cfg_attr(docsrs, doc(cfg(feature = "net")))]
Ipv6PacketInfo(libc::in6_pktinfo),
#[cfg(bsd)]
#[cfg(feature = "net")]
#[cfg_attr(docsrs, doc(cfg(feature = "net")))]
Ipv4RecvIf(libc::sockaddr_dl),
#[cfg(bsd)]
#[cfg(feature = "net")]
#[cfg_attr(docsrs, doc(cfg(feature = "net")))]
Ipv4RecvDstAddr(libc::in_addr),
#[cfg(any(linux_android, target_os = "freebsd"))]
#[cfg(feature = "net")]
#[cfg_attr(docsrs, doc(cfg(feature = "net")))]
Ipv4OrigDstAddr(libc::sockaddr_in),
#[cfg(any(linux_android, target_os = "freebsd"))]
#[cfg(feature = "net")]
#[cfg_attr(docsrs, doc(cfg(feature = "net")))]
Ipv6OrigDstAddr(libc::sockaddr_in6),
/// UDP Generic Receive Offload (GRO) allows receiving multiple UDP
/// packets from a single sender.
/// Fixed-size payloads are following one by one in a receive buffer.
/// This Control Message indicates the size of all smaller packets,
/// except, maybe, the last one.
///
/// `UdpGroSegment` socket option should be enabled on a socket
/// to allow receiving GRO packets.
#[cfg(target_os = "linux")]
#[cfg(feature = "net")]
#[cfg_attr(docsrs, doc(cfg(feature = "net")))]
UdpGroSegments(u16),
/// SO_RXQ_OVFL indicates that an unsigned 32 bit value
/// ancilliary msg (cmsg) should be attached to recieved
/// skbs indicating the number of packets dropped by the
/// socket between the last recieved packet and this
/// received packet.
///
/// `RxqOvfl` socket option should be enabled on a socket
/// to allow receiving the drop counter.
#[cfg(any(linux_android, target_os = "fuchsia"))]
RxqOvfl(u32),
/// Socket error queue control messages read with the `MSG_ERRQUEUE` flag.
#[cfg(linux_android)]
#[cfg(feature = "net")]
#[cfg_attr(docsrs, doc(cfg(feature = "net")))]
Ipv4RecvErr(libc::sock_extended_err, Option<sockaddr_in>),
/// Socket error queue control messages read with the `MSG_ERRQUEUE` flag.
#[cfg(linux_android)]
#[cfg(feature = "net")]
#[cfg_attr(docsrs, doc(cfg(feature = "net")))]
Ipv6RecvErr(libc::sock_extended_err, Option<sockaddr_in6>),
/// `SOL_TLS` messages of type `TLS_GET_RECORD_TYPE`
#[cfg(any(target_os = "linux"))]
TlsGetRecordType(TlsGetRecordType),
/// Catch-all variant for unimplemented cmsg types.
#[doc(hidden)]
Unknown(UnknownCmsg),
}
/// For representing packet timestamps via `SO_TIMESTAMPING` interface
#[cfg(linux_android)]
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct Timestamps {
/// software based timestamp, usually one containing data
pub system: TimeSpec,
/// legacy timestamp, usually empty
pub hw_trans: TimeSpec,
/// hardware based timestamp
pub hw_raw: TimeSpec,
}
/// These constants correspond to TLS 1.2 message types, as defined in
/// RFC 5246, Appendix A.1
#[cfg(any(target_os = "linux"))]
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
#[repr(u8)]
#[non_exhaustive]
pub enum TlsGetRecordType {
ChangeCipherSpec ,
Alert,
Handshake,
ApplicationData,
Unknown(u8),
}
#[cfg(any(target_os = "linux"))]
impl From<u8> for TlsGetRecordType {
fn from(x: u8) -> Self {
match x {
20 => TlsGetRecordType::ChangeCipherSpec,
21 => TlsGetRecordType::Alert,
22 => TlsGetRecordType::Handshake,
23 => TlsGetRecordType::ApplicationData,
_ => TlsGetRecordType::Unknown(x),
}
}
}
impl ControlMessageOwned {
/// Decodes a `ControlMessageOwned` from raw bytes.
///
/// This is only safe to call if the data is correct for the message type
/// specified in the header. Normally, the kernel ensures that this is the
/// case. "Correct" in this case includes correct length, alignment and
/// actual content.
// Clippy complains about the pointer alignment of `p`, not understanding
// that it's being fed to a function that can handle that.
#[allow(clippy::cast_ptr_alignment)]
unsafe fn decode_from(header: &cmsghdr) -> ControlMessageOwned
{
let p = unsafe { CMSG_DATA(header) };
// The cast is not unnecessary on all platforms.
#[allow(clippy::unnecessary_cast)]
let len = header as *const _ as usize + header.cmsg_len as usize
- p as usize;
match (header.cmsg_level, header.cmsg_type) {
(libc::SOL_SOCKET, libc::SCM_RIGHTS) => {
let n = len / mem::size_of::<RawFd>();
let mut fds = Vec::with_capacity(n);
for i in 0..n {
unsafe {
let fdp = (p as *const RawFd).add(i);
fds.push(ptr::read_unaligned(fdp));
}
}
ControlMessageOwned::ScmRights(fds)
},
#[cfg(linux_android)]
(libc::SOL_SOCKET, libc::SCM_CREDENTIALS) => {
let cred: libc::ucred = unsafe { ptr::read_unaligned(p as *const _) };
ControlMessageOwned::ScmCredentials(cred.into())
}
#[cfg(freebsdlike)]
(libc::SOL_SOCKET, libc::SCM_CREDS) => {
let cred: libc::cmsgcred = unsafe { ptr::read_unaligned(p as *const _) };
ControlMessageOwned::ScmCreds(cred.into())
}
#[cfg(not(any(target_os = "aix", target_os = "haiku")))]
(libc::SOL_SOCKET, libc::SCM_TIMESTAMP) => {
let tv: libc::timeval = unsafe { ptr::read_unaligned(p as *const _) };
ControlMessageOwned::ScmTimestamp(TimeVal::from(tv))
},
#[cfg(linux_android)]
(libc::SOL_SOCKET, libc::SCM_TIMESTAMPNS) => {
let ts: libc::timespec = unsafe { ptr::read_unaligned(p as *const _) };
ControlMessageOwned::ScmTimestampns(TimeSpec::from(ts))
}
#[cfg(target_os = "freebsd")]
(libc::SOL_SOCKET, libc::SCM_REALTIME) => {
let ts: libc::timespec = unsafe { ptr::read_unaligned(p as *const _) };
ControlMessageOwned::ScmRealtime(TimeSpec::from(ts))
}
#[cfg(target_os = "freebsd")]
(libc::SOL_SOCKET, libc::SCM_MONOTONIC) => {
let ts: libc::timespec = unsafe { ptr::read_unaligned(p as *const _) };
ControlMessageOwned::ScmMonotonic(TimeSpec::from(ts))
}
#[cfg(linux_android)]
(libc::SOL_SOCKET, libc::SCM_TIMESTAMPING) => {
let tp = p as *const libc::timespec;
let ts: libc::timespec = unsafe { ptr::read_unaligned(tp) };
let system = TimeSpec::from(ts);
let ts: libc::timespec = unsafe { ptr::read_unaligned(tp.add(1)) };
let hw_trans = TimeSpec::from(ts);
let ts: libc::timespec = unsafe { ptr::read_unaligned(tp.add(2)) };
let hw_raw = TimeSpec::from(ts);
let timestamping = Timestamps { system, hw_trans, hw_raw };
ControlMessageOwned::ScmTimestampsns(timestamping)
}
#[cfg(any(target_os = "freebsd", linux_android, apple_targets))]
#[cfg(feature = "net")]
(libc::IPPROTO_IPV6, libc::IPV6_PKTINFO) => {
let info = unsafe { ptr::read_unaligned(p as *const libc::in6_pktinfo) };
ControlMessageOwned::Ipv6PacketInfo(info)
}
#[cfg(any(linux_android, apple_targets, target_os = "netbsd"))]
#[cfg(feature = "net")]
(libc::IPPROTO_IP, libc::IP_PKTINFO) => {
let info = unsafe { ptr::read_unaligned(p as *const libc::in_pktinfo) };
ControlMessageOwned::Ipv4PacketInfo(info)
}
#[cfg(bsd)]
#[cfg(feature = "net")]
(libc::IPPROTO_IP, libc::IP_RECVIF) => {
let dl = unsafe { ptr::read_unaligned(p as *const libc::sockaddr_dl) };
ControlMessageOwned::Ipv4RecvIf(dl)
},
#[cfg(bsd)]
#[cfg(feature = "net")]
(libc::IPPROTO_IP, libc::IP_RECVDSTADDR) => {
let dl = unsafe { ptr::read_unaligned(p as *const libc::in_addr) };
ControlMessageOwned::Ipv4RecvDstAddr(dl)
},
#[cfg(any(linux_android, target_os = "freebsd"))]
#[cfg(feature = "net")]
(libc::IPPROTO_IP, libc::IP_ORIGDSTADDR) => {
let dl = unsafe { ptr::read_unaligned(p as *const libc::sockaddr_in) };
ControlMessageOwned::Ipv4OrigDstAddr(dl)
},
#[cfg(target_os = "linux")]
#[cfg(feature = "net")]
(libc::SOL_UDP, libc::UDP_GRO) => {
let gso_size: u16 = unsafe { ptr::read_unaligned(p as *const _) };
ControlMessageOwned::UdpGroSegments(gso_size)
},
#[cfg(any(linux_android, target_os = "fuchsia"))]
(libc::SOL_SOCKET, libc::SO_RXQ_OVFL) => {
let drop_counter = unsafe { ptr::read_unaligned(p as *const u32) };
ControlMessageOwned::RxqOvfl(drop_counter)
},
#[cfg(linux_android)]
#[cfg(feature = "net")]
(libc::IPPROTO_IP, libc::IP_RECVERR) => {
let (err, addr) = unsafe { Self::recv_err_helper::<sockaddr_in>(p, len) };
ControlMessageOwned::Ipv4RecvErr(err, addr)
},
#[cfg(linux_android)]
#[cfg(feature = "net")]
(libc::IPPROTO_IPV6, libc::IPV6_RECVERR) => {
let (err, addr) = unsafe { Self::recv_err_helper::<sockaddr_in6>(p, len) };
ControlMessageOwned::Ipv6RecvErr(err, addr)
},
#[cfg(any(linux_android, target_os = "freebsd"))]
#[cfg(feature = "net")]
(libc::IPPROTO_IPV6, libc::IPV6_ORIGDSTADDR) => {
let dl = unsafe { ptr::read_unaligned(p as *const libc::sockaddr_in6) };
ControlMessageOwned::Ipv6OrigDstAddr(dl)
},
#[cfg(any(target_os = "linux"))]
(libc::SOL_TLS, libc::TLS_GET_RECORD_TYPE) => {
let content_type = unsafe { ptr::read_unaligned(p as *const u8) };
ControlMessageOwned::TlsGetRecordType(content_type.into())
},
(_, _) => {
let sl = unsafe { std::slice::from_raw_parts(p, len) };
let ucmsg = UnknownCmsg(*header, Vec::<u8>::from(sl));
ControlMessageOwned::Unknown(ucmsg)
}
}
}
#[cfg(linux_android)]
#[cfg(feature = "net")]
#[allow(clippy::cast_ptr_alignment)] // False positive
unsafe fn recv_err_helper<T>(p: *mut libc::c_uchar, len: usize) -> (libc::sock_extended_err, Option<T>) {
let ee = p as *const libc::sock_extended_err;
let err = unsafe { ptr::read_unaligned(ee) };