Add safe sockopt rules (#284)

I implemented setsockopt in libcc2rs/src/libc_shims/socket.rs because it
contains a lot of match arms and some of them are linux specific. It
doesn't make sense to have them in the generated code for macos, for
example

Author: lucic71

libcc2rs/src/libc_shims/socket.rs

@@ -378,3 +378,104 @@ impl Sockaddr {
         out_len.write(ss.len());
     }
 }
+
+pub fn setsockopt_refcount(fd: i32, level: i32, optname: i32, optval: crate::AnyPtr) -> i32 {
+    let res = match (level, optname) {
+        (::libc::IPPROTO_TCP, ::libc::TCP_NODELAY) => {
+            let v = optval.reinterpret_cast::<i32>().read() != 0;
+            crate::FdRegistry::with_fd(fd, |borrowed| {
+                nix::sys::socket::setsockopt(&borrowed, nix::sys::socket::sockopt::TcpNoDelay, &v)
+            })
+        }
+        (::libc::SOL_SOCKET, ::libc::SO_KEEPALIVE) => {
+            let v = optval.reinterpret_cast::<i32>().read() != 0;
+            crate::FdRegistry::with_fd(fd, |borrowed| {
+                nix::sys::socket::setsockopt(&borrowed, nix::sys::socket::sockopt::KeepAlive, &v)
+            })
+        }
+        (::libc::IPPROTO_TCP, ::libc::TCP_KEEPINTVL) => {
+            let v = optval.reinterpret_cast::<u32>().read();
+            crate::FdRegistry::with_fd(fd, |borrowed| {
+                nix::sys::socket::setsockopt(
+                    &borrowed,
+                    nix::sys::socket::sockopt::TcpKeepInterval,
+                    &v,
+                )
+            })
+        }
+        (::libc::IPPROTO_TCP, ::libc::TCP_KEEPCNT) => {
+            let v = optval.reinterpret_cast::<u32>().read();
+            crate::FdRegistry::with_fd(fd, |borrowed| {
+                nix::sys::socket::setsockopt(&borrowed, nix::sys::socket::sockopt::TcpKeepCount, &v)
+            })
+        }
+        #[cfg(target_os = "linux")]
+        (::libc::IPPROTO_IP, ::libc::IP_TOS) => {
+            let v = optval.reinterpret_cast::<i32>().read();
+            crate::FdRegistry::with_fd(fd, |borrowed| {
+                nix::sys::socket::setsockopt(&borrowed, nix::sys::socket::sockopt::Ipv4Tos, &v)
+            })
+        }
+        #[cfg(target_os = "linux")]
+        (::libc::IPPROTO_IPV6, ::libc::IPV6_TCLASS) => {
+            let v = optval.reinterpret_cast::<i32>().read();
+            crate::FdRegistry::with_fd(fd, |borrowed| {
+                nix::sys::socket::setsockopt(&borrowed, nix::sys::socket::sockopt::Ipv6TClass, &v)
+            })
+        }
+        #[cfg(target_os = "linux")]
+        (::libc::IPPROTO_TCP, ::libc::TCP_KEEPIDLE) => {
+            let v = optval.reinterpret_cast::<u32>().read();
+            crate::FdRegistry::with_fd(fd, |borrowed| {
+                nix::sys::socket::setsockopt(&borrowed, nix::sys::socket::sockopt::TcpKeepIdle, &v)
+            })
+        }
+        #[cfg(target_os = "linux")]
+        (::libc::SOL_SOCKET, ::libc::SO_BINDTODEVICE) => {
+            let v = ::std::ffi::OsString::from(optval.reinterpret_cast::<u8>().to_rust_string());
+            crate::FdRegistry::with_fd(fd, |borrowed| {
+                nix::sys::socket::setsockopt(&borrowed, nix::sys::socket::sockopt::BindToDevice, &v)
+            })
+        }
+        #[cfg(target_os = "linux")]
+        (::libc::IPPROTO_IP, ::libc::IP_BIND_ADDRESS_NO_PORT) => {
+            let v = optval.reinterpret_cast::<i32>().read() != 0;
+            crate::FdRegistry::with_fd(fd, |borrowed| {
+                nix::sys::socket::setsockopt(
+                    &borrowed,
+                    nix::sys::socket::sockopt::IpBindAddressNoPort,
+                    &v,
+                )
+            })
+        }
+        #[cfg(target_os = "linux")]
+        (::libc::IPPROTO_TCP, ::libc::TCP_FASTOPEN_CONNECT) => {
+            let v = optval.reinterpret_cast::<i32>().read() != 0;
+            crate::FdRegistry::with_fd(fd, |borrowed| {
+                nix::sys::socket::setsockopt(
+                    &borrowed,
+                    nix::sys::socket::sockopt::TcpFastOpenConnect,
+                    &v,
+                )
+            })
+        }
+        #[cfg(target_os = "linux")]
+        (::libc::SOL_SOCKET, ::libc::SO_PRIORITY) => {
+            let v = optval.reinterpret_cast::<i32>().read();
+            crate::FdRegistry::with_fd(fd, |borrowed| {
+                nix::sys::socket::setsockopt(&borrowed, nix::sys::socket::sockopt::Priority, &v)
+            })
+        }
+        (l, o) => panic!(
+            "setsockopt: unsupported option (level={}, optname={})",
+            l, o
+        ),
+    };
+    match res {
+        Ok(()) => 0,
+        Err(e) => {
+            crate::cpp2rust_errno().write(e as i32);
+            -1
+        }
+    }
+}

rules/ip/src.cpp

@@ -1,4 +1,5 @@
 #include <netinet/in.h>
+#include <netinet/tcp.h>
 
 typedef struct sockaddr_in t1;
 typedef struct in_addr t2;
@@ -26,3 +27,7 @@ int f5() {
   return IPPROTO_MPTCP;
 }
 #endif
+
+int f6() {
+  return TCP_NODELAY;
+}

rules/ip/tgt_unsafe.rs

@@ -34,3 +34,7 @@ unsafe fn f4() -> i32 {
 unsafe fn f5() -> i32 {
     libc::IPPROTO_MPTCP
 }
+
+unsafe fn f6() -> i32 {
+    libc::TCP_NODELAY
+}

rules/socket/src.c

@@ -96,3 +96,15 @@ int f20() {
 int f21() {
   return AF_INET6;
 }
+
+int f22() {
+  return SOL_SOCKET;
+}
+
+int f23() {
+  return SO_KEEPALIVE;
+}
+
+int f24() {
+  return SO_ERROR;
+}

rules/socket/tgt_refcount.rs

@@ -218,3 +218,35 @@ fn f17(a0: i32, a1: i32) -> i32 {
         }
     }
 }
+
+fn f7(a0: i32, a1: i32, a2: i32, a3: AnyPtr, a4: u32) -> i32 {
+    let __a0 = a0;
+    let __a1 = a1;
+    let __a2 = a2;
+    let __a3 = a3;
+    libcc2rs::setsockopt_refcount(__a0, __a1, __a2, __a3)
+}
+
+fn f8(a0: i32, a1: i32, a2: i32, a3: AnyPtr, a4: Ptr<u32>) -> i32 {
+    match (a1, a2) {
+        (::libc::SOL_SOCKET, ::libc::SO_ERROR) => {
+            match FdRegistry::with_fd(a0, |__fd| {
+                nix::sys::socket::getsockopt(&__fd, nix::sys::socket::sockopt::SocketError)
+            }) {
+                Ok(__err) => {
+                    a3.reinterpret_cast::<i32>().write(__err);
+                    a4.write(::std::mem::size_of::<i32>() as u32);
+                    0
+                }
+                Err(__e) => {
+                    libcc2rs::cpp2rust_errno().write(__e as i32);
+                    -1
+                }
+            }
+        }
+        (__l, __o) => panic!(
+            "getsockopt: unsupported option (level={}, optname={})",
+            __l, __o
+        ),
+    }
+}

rules/socket/tgt_unsafe.rs

@@ -110,3 +110,15 @@ unsafe fn f20() -> i32 {
 unsafe fn f21() -> i32 {
     libc::AF_INET6
 }
+
+unsafe fn f22() -> i32 {
+    libc::SOL_SOCKET
+}
+
+unsafe fn f23() -> i32 {
+    libc::SO_KEEPALIVE
+}
+
+unsafe fn f24() -> i32 {
+    libc::SO_ERROR
+}

tests/unit/out/refcount/sockopt.rs

@@ -0,0 +1,94 @@
+extern crate libcc2rs;
+use libcc2rs::*;
+use std::cell::RefCell;
+use std::collections::BTreeMap;
+use std::io::prelude::*;
+use std::io::{Read, Seek, Write};
+use std::os::fd::AsFd;
+use std::rc::{Rc, Weak};
+pub fn main() {
+    std::process::exit(main_0());
+}
+fn main_0() -> i32 {
+    let s: Value<i32> = Rc::new(RefCell::new({
+        let __family = match libc::AF_INET {
+            ::libc::AF_INET => nix::sys::socket::AddressFamily::Inet,
+            ::libc::AF_INET6 => nix::sys::socket::AddressFamily::Inet6,
+            ::libc::AF_UNIX => nix::sys::socket::AddressFamily::Unix,
+            __d => panic!("socket: unsupported domain {__d}"),
+        };
+        let __flags = nix::sys::socket::SockFlag::from_bits_truncate(libc::SOCK_STREAM);
+        let __ty = match libc::SOCK_STREAM & !nix::sys::socket::SockFlag::all().bits() {
+            ::libc::SOCK_STREAM => nix::sys::socket::SockType::Stream,
+            ::libc::SOCK_DGRAM => nix::sys::socket::SockType::Datagram,
+            __t => panic!("socket: unsupported type {__t}"),
+        };
+        let __proto = match 0 {
+            0 => None,
+            ::libc::IPPROTO_TCP => Some(nix::sys::socket::SockProtocol::Tcp),
+            ::libc::IPPROTO_UDP => Some(nix::sys::socket::SockProtocol::Udp),
+            __p => panic!("socket: unsupported protocol {__p}"),
+        };
+        match nix::sys::socket::socket(__family, __ty, __flags, __proto) {
+            Ok(__ofd) => FdRegistry::register(__ofd),
+            Err(__e) => {
+                libcc2rs::cpp2rust_errno().write(__e as i32);
+                -1
+            }
+        }
+    }));
+    assert!(((((*s.borrow()) >= 0) as i32) != 0));
+    let on: Value<i32> = Rc::new(RefCell::new(1));
+    assert!(
+        ((({
+            let __a0 = (*s.borrow());
+            let __a1 = libc::SOL_SOCKET;
+            let __a2 = libc::SO_KEEPALIVE;
+            let __a3 = ((on.as_pointer()) as Ptr<i32>).to_any();
+            libcc2rs::setsockopt_refcount(__a0, __a1, __a2, __a3)
+        } == 0) as i32)
+            != 0)
+    );
+    assert!(
+        ((({
+            let __a0 = (*s.borrow());
+            let __a1 = libc::IPPROTO_TCP;
+            let __a2 = libc::TCP_NODELAY;
+            let __a3 = ((on.as_pointer()) as Ptr<i32>).to_any();
+            libcc2rs::setsockopt_refcount(__a0, __a1, __a2, __a3)
+        } == 0) as i32)
+            != 0)
+    );
+    let err: Value<i32> = Rc::new(RefCell::new(-1_i32));
+    let len: Value<u32> = Rc::new(RefCell::new((::std::mem::size_of::<i32>() as u32)));
+    assert!(
+        (((match (libc::SOL_SOCKET, libc::SO_ERROR) {
+            (::libc::SOL_SOCKET, ::libc::SO_ERROR) => {
+                match FdRegistry::with_fd((*s.borrow()), |__fd| {
+                    nix::sys::socket::getsockopt(&__fd, nix::sys::socket::sockopt::SocketError)
+                }) {
+                    Ok(__err) => {
+                        ((err.as_pointer()) as Ptr<i32>)
+                            .to_any()
+                            .reinterpret_cast::<i32>()
+                            .write(__err);
+                        (len.as_pointer()).write(::std::mem::size_of::<i32>() as u32);
+                        0
+                    }
+                    Err(__e) => {
+                        libcc2rs::cpp2rust_errno().write(__e as i32);
+                        -1
+                    }
+                }
+            }
+            (__l, __o) => panic!(
+                "getsockopt: unsupported option (level={}, optname={})",
+                __l, __o
+            ),
+        } == 0) as i32)
+            != 0)
+    );
+    assert!(((((*err.borrow()) == 0) as i32) != 0));
+    assert!((((FdRegistry::close((*s.borrow())) == 0) as i32) != 0));
+    return 0;
+}

tests/unit/out/unsafe/sockopt.rs

@@ -0,0 +1,53 @@
+extern crate libc;
+use libc::*;
+extern crate libcc2rs;
+use libcc2rs::*;
+use std::collections::BTreeMap;
+use std::io::{Read, Seek, Write};
+use std::os::fd::{AsFd, FromRawFd, IntoRawFd};
+use std::rc::Rc;
+pub fn main() {
+    unsafe {
+        std::process::exit(main_0() as i32);
+    }
+}
+unsafe fn main_0() -> i32 {
+    let mut s: i32 = libc::socket(libc::AF_INET, libc::SOCK_STREAM, 0);
+    assert!(((((s) >= (0)) as i32) != 0));
+    let mut on: i32 = 1;
+    assert!(
+        ((((libc::setsockopt(
+            s,
+            libc::SOL_SOCKET,
+            libc::SO_KEEPALIVE,
+            ((&mut on as *mut i32) as *const i32 as *const ::libc::c_void),
+            (::std::mem::size_of::<i32>() as u32)
+        )) == (0)) as i32)
+            != 0)
+    );
+    assert!(
+        ((((libc::setsockopt(
+            s,
+            libc::IPPROTO_TCP,
+            libc::TCP_NODELAY,
+            ((&mut on as *mut i32) as *const i32 as *const ::libc::c_void),
+            (::std::mem::size_of::<i32>() as u32)
+        )) == (0)) as i32)
+            != 0)
+    );
+    let mut err: i32 = -1_i32;
+    let mut len: u32 = (::std::mem::size_of::<i32>() as u32);
+    assert!(
+        ((((libc::getsockopt(
+            s,
+            libc::SOL_SOCKET,
+            libc::SO_ERROR,
+            ((&mut err as *mut i32) as *mut i32 as *mut ::libc::c_void),
+            (&mut len as *mut u32)
+        )) == (0)) as i32)
+            != 0)
+    );
+    assert!(((((err) == (0)) as i32) != 0));
+    assert!(((((libc::close(s)) == (0)) as i32) != 0));
+    return 0;
+}

tests/unit/sockopt.c

@@ -0,0 +1,19 @@
+#include <assert.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+int main(void) {
+  int s = socket(AF_INET, SOCK_STREAM, 0);
+  assert(s >= 0);
+  int on = 1;
+  assert(setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on)) == 0);
+  assert(setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) == 0);
+  int err = -1;
+  socklen_t len = sizeof(err);
+  assert(getsockopt(s, SOL_SOCKET, SO_ERROR, &err, &len) == 0);
+  assert(err == 0);
+  assert(close(s) == 0);
+  return 0;
+}