Merge #1486 #1490 #1493

1486: Relax assertions in sockaddr_storage_to_addr to match the documentation. r=asomers a=khuey

Fixes #1479

1490: add libc::IP6T_SO_ORIGINAL_DST to socket opt r=asomers a=bearice

the original PR #1410 was stalled for a while
let's make it happen.

this should closes #1410 and #938

1493: Fix crates.io badge r=asomers a=atouchet



Co-authored-by: Kyle Huey <khuey@kylehuey.com>
Co-authored-by: Icemic <bingfeng.web@gmail.com>
Co-authored-by: Bearice Ren <bearice@icybear.net>
Co-authored-by: Alex Touchet <alextouchet@outlook.com>

CHANGELOG.md

@@ -24,6 +24,8 @@ This project adheres to [Semantic Versioning](https://semver.org/).
   (#[1302](https://github.com/nix-rust/nix/pull/1302))
 - Added `ptrace::interrupt` method for platforms that support `PTRACE_INTERRUPT`
   (#[1422](https://github.com/nix-rust/nix/pull/1422))
+- Added `IP6T_SO_ORIGINAL_DST` sockopt.
+  (#[1490](https://github.com/nix-rust/nix/pull/1490))
 
 ### Changed
 

README.md

@@ -1,7 +1,7 @@
 # Rust bindings to *nix APIs
 
 [![Cirrus Build Status](https://api.cirrus-ci.com/github/nix-rust/nix.svg)](https://cirrus-ci.com/github/nix-rust/nix)
-[![crates.io](https://meritbadge.herokuapp.com/nix)](https://crates.io/crates/nix)
+[![crates.io](https://img.shields.io/crates/v/nix.svg)](https://crates.io/crates/nix)
 
 [Documentation (Releases)](https://docs.rs/nix/)
 

src/sys/socket/mod.rs

@@ -1780,21 +1780,21 @@ pub fn sockaddr_storage_to_addr(
     addr: &sockaddr_storage,
     len: usize) -> Result<SockAddr> {
 
-    assert!(len <= mem::size_of::<sockaddr_un>());
+    assert!(len <= mem::size_of::<sockaddr_storage>());
     if len < mem::size_of_val(&addr.ss_family) {
         return Err(Error::from(Errno::ENOTCONN));
     }
 
     match c_int::from(addr.ss_family) {
         libc::AF_INET => {
-            assert_eq!(len as usize, mem::size_of::<sockaddr_in>());
+            assert!(len as usize >= mem::size_of::<sockaddr_in>());
             let sin = unsafe {
                 *(addr as *const sockaddr_storage as *const sockaddr_in)
             };
             Ok(SockAddr::Inet(InetAddr::V4(sin)))
         }
         libc::AF_INET6 => {
-            assert_eq!(len as usize, mem::size_of::<sockaddr_in6>());
+            assert!(len as usize >= mem::size_of::<sockaddr_in6>());
             let sin6 = unsafe {
                 *(addr as *const _ as *const sockaddr_in6)
             };
@@ -1810,10 +1810,10 @@ pub fn sockaddr_storage_to_addr(
         #[cfg(any(target_os = "android", target_os = "linux"))]
         libc::AF_PACKET => {
             use libc::sockaddr_ll;
+            // Don't assert anything about the size.
             // Apparently the Linux kernel can return smaller sizes when
             // the value in the last element of sockaddr_ll (`sll_addr`) is
             // smaller than the declared size of that field
-            assert!(len as usize <= mem::size_of::<sockaddr_ll>());
             let sll = unsafe {
                 *(addr as *const _ as *const sockaddr_ll)
             };

src/sys/socket/sockopt.rs

@@ -283,6 +283,8 @@ sockopt_impl!(GetOnly, AcceptConn, libc::SOL_SOCKET, libc::SO_ACCEPTCONN, bool);
 sockopt_impl!(Both, BindToDevice, libc::SOL_SOCKET, libc::SO_BINDTODEVICE, OsString<[u8; libc::IFNAMSIZ]>);
 #[cfg(any(target_os = "android", target_os = "linux"))]
 sockopt_impl!(GetOnly, OriginalDst, libc::SOL_IP, libc::SO_ORIGINAL_DST, libc::sockaddr_in);
+#[cfg(any(target_os = "android", target_os = "linux"))]
+sockopt_impl!(GetOnly, Ip6tOriginalDst, libc::SOL_IPV6, libc::IP6T_SO_ORIGINAL_DST, libc::sockaddr_in6);
 sockopt_impl!(Both, ReceiveTimestamp, libc::SOL_SOCKET, libc::SO_TIMESTAMP, bool);
 #[cfg(all(target_os = "linux"))]
 sockopt_impl!(Both, ReceiveTimestampns, libc::SOL_SOCKET, libc::SO_TIMESTAMPNS, bool);

test/sys/test_socket.rs

@@ -1,12 +1,13 @@
-use nix::sys::socket::{AddressFamily, InetAddr, UnixAddr, getsockname};
+use nix::sys::socket::{AddressFamily, InetAddr, SockAddr, UnixAddr, getsockname, sockaddr, sockaddr_in6, sockaddr_storage_to_addr};
 use std::collections::hash_map::DefaultHasher;
 use std::hash::{Hash, Hasher};
+use std::mem::{self, MaybeUninit};
 use std::net::{self, Ipv6Addr, SocketAddr, SocketAddrV6};
 use std::os::unix::io::RawFd;
 use std::path::Path;
 use std::slice;
 use std::str::FromStr;
-use libc::c_char;
+use libc::{c_char, sockaddr_storage};
 #[cfg(any(target_os = "linux", target_os= "android"))]
 use crate::*;
 
@@ -33,6 +34,29 @@ pub fn test_inetv4_addr_to_sock_addr() {
     assert_eq!(actual, inet);
 }
 
+#[test]
+pub fn test_inetv4_addr_roundtrip_sockaddr_storage_to_addr() {
+    let actual: net::SocketAddr = FromStr::from_str("127.0.0.1:3000").unwrap();
+    let addr = InetAddr::from_std(&actual);
+    let sockaddr = SockAddr::new_inet(addr);
+
+    let (storage, ffi_size) = {
+        let mut storage = MaybeUninit::<sockaddr_storage>::zeroed();
+        let storage_ptr = storage.as_mut_ptr().cast::<sockaddr>();
+        let (ffi_ptr, ffi_size) = sockaddr.as_ffi_pair();
+        assert_eq!(mem::size_of::<sockaddr>(), ffi_size as usize);
+        unsafe {
+            storage_ptr.copy_from_nonoverlapping(ffi_ptr as *const sockaddr, 1);
+            (storage.assume_init(), ffi_size)
+        }
+    };
+
+    let from_storage = sockaddr_storage_to_addr(&storage, ffi_size as usize).unwrap();
+    assert_eq!(from_storage, sockaddr);
+    let from_storage = sockaddr_storage_to_addr(&storage, mem::size_of::<sockaddr_storage>()).unwrap();
+    assert_eq!(from_storage, sockaddr);
+}
+
 #[test]
 pub fn test_inetv6_addr_to_sock_addr() {
     let port: u16 = 3000;
@@ -54,6 +78,33 @@ pub fn test_inetv6_addr_to_sock_addr() {
 
     assert_eq!(actual, addr.to_std());
 }
+#[test]
+pub fn test_inetv6_addr_roundtrip_sockaddr_storage_to_addr() {
+    let port: u16 = 3000;
+    let flowinfo: u32 = 1;
+    let scope_id: u32 = 2;
+    let ip: Ipv6Addr = "fe80::1".parse().unwrap();
+
+    let actual = SocketAddr::V6(SocketAddrV6::new(ip, port, flowinfo, scope_id));
+    let addr = InetAddr::from_std(&actual);
+    let sockaddr = SockAddr::new_inet(addr);
+
+    let (storage, ffi_size) = {
+        let mut storage = MaybeUninit::<sockaddr_storage>::zeroed();
+        let storage_ptr = storage.as_mut_ptr().cast::<sockaddr_in6>();
+        let (ffi_ptr, ffi_size) = sockaddr.as_ffi_pair();
+        assert_eq!(mem::size_of::<sockaddr_in6>(), ffi_size as usize);
+        unsafe {
+            storage_ptr.copy_from_nonoverlapping((ffi_ptr as *const sockaddr).cast::<sockaddr_in6>(), 1);
+            (storage.assume_init(), ffi_size)
+        }
+    };
+
+    let from_storage = sockaddr_storage_to_addr(&storage, ffi_size as usize).unwrap();
+    assert_eq!(from_storage, sockaddr);
+    let from_storage = sockaddr_storage_to_addr(&storage, mem::size_of::<sockaddr_storage>()).unwrap();
+    assert_eq!(from_storage, sockaddr);
+}
 
 #[test]
 pub fn test_path_to_sock_addr() {
@@ -1169,7 +1220,6 @@ fn loopback_address(family: AddressFamily) -> Option<nix::ifaddrs::InterfaceAddr
     use std::io;
     use std::io::Write;
     use nix::ifaddrs::getifaddrs;
-    use nix::sys::socket::SockAddr;
     use nix::net::if_::*;
 
     let addrs = match getifaddrs() {