socket2 0.6.5: socket2::Domain

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[dependencies]
socket2 = "=0.6.5"

[[bin]]
name = "contract"
path = "test/contract.rs"

# socket2 0.6.5 Domain API Contracts

## What `search_known_solution` answered
`search_known_solution` returned NO_SAFE_MATCH. No sample in the network verified socket2::Domain in pkg:cargo/socket2@0.6.5.

## What a model would have written instead
A model may assume `Domain` is an enum or expect lowercase variants (like `Domain::Ipv4`), or attempt to access platform-specific libc constants directly instead of using `Domain::IPV4`, `Domain::IPV6`, `Domain::UNIX`, or `Domain::for_address(addr)`.

## How the wrong version fails
`socket2::Domain` is a newtype struct wrapping `c_int`, not an enum. Its constants are uppercase (`Domain::IPV4`, `Domain::IPV6`, `Domain::UNIX`), and it provides helper methods like `Domain::for_address` and bidirectional `From`/`Into` conversions with `c_int`.

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify socket2::Domain in pkg:cargo/socket2@0.6.5
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/socket2@0.6.5
Demonstrate these symbols/APIs:
  - socket2::Domain

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:f0c18597f23ae16d834a9fac36446e44be64f7b5403f20cbd40c6155fda1bea7","contract":["assert Domain::IPV4, Domain::IPV6, and Domain::UNIX are distinct communication domains","assert Domain converts to and from c_int matching libc AF_INET, AF_INET6, and AF_UNIX constants","assert Domain::for_address returns Domain::IPV4 for IPv4 socket addresses and Domain::IPV6 for IPv6 socket addresses","assert Socket::new constructs valid stream sockets using Domain::IPV4 and Domain::UNIX"],"goal":"verify socket2::Domain in pkg:cargo/socket2@0.6.5","kind":"HOW","packages":["pkg:cargo/socket2@0.6.5"],"schemaVersion":1,"symbols":["socket2::Domain"]},"contractCommand":["cargo","run","--offline"],"environment":{"arch":"x64","distro":"alpine","ecosystem":"cargo","libc":"musl","os":"linux","packageManager":"cargo","schemaVersion":1},"license":"MIT-0","packages":["pkg:cargo/socket2@0.6.5"],"schemaVersion":1,"subject":"pkg:cargo/socket2@0.6.5","symbols":["socket2::Domain"],"verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify socket2::Domain in pkg:cargo/socket2@0.6.5",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/socket2@0.6.5"
  ],
  "symbols": [
    "socket2::Domain"
  ]
}

//! Clean-room verification sample for socket2::Domain.

pub use socket2::Domain;

use std::ffi::c_int;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr};
use socket2::{Domain, Socket, Type};

fn main() {
    // 1. Verify Domain constants and conversions to/from raw c_int
    let ipv4 = Domain::IPV4;
    let raw_ipv4: c_int = ipv4.into();
    assert_eq!(Domain::from(raw_ipv4), Domain::IPV4);
    assert_eq!(raw_ipv4, 2); // AF_INET on Linux

    let ipv6 = Domain::IPV6;
    let raw_ipv6: c_int = ipv6.into();
    assert_eq!(Domain::from(raw_ipv6), Domain::IPV6);
    assert_eq!(raw_ipv6, 10); // AF_INET6 on Linux

    let unix = Domain::UNIX;
    let raw_unix: c_int = unix.into();
    assert_eq!(Domain::from(raw_unix), Domain::UNIX);
    assert_eq!(raw_unix, 1); // AF_UNIX on Linux

    assert_ne!(Domain::IPV4, Domain::IPV6);
    assert_ne!(Domain::IPV4, Domain::UNIX);
    assert_ne!(Domain::IPV6, Domain::UNIX);

    // 2. Verify Domain::for_address helper for IPv4 and IPv6 addresses
    let addr_v4 = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
    assert_eq!(Domain::for_address(addr_v4), Domain::IPV4);

    let addr_v6 = SocketAddr::new(IpAddr::V6(Ipv6Addr::LOCALHOST), 8080);
    assert_eq!(Domain::for_address(addr_v6), Domain::IPV6);

    // 3. Verify Socket creation with Domain
    let sock_v4 = Socket::new(Domain::IPV4, Type::STREAM, None).expect("IPv4 socket creation should succeed");
    drop(sock_v4);

    let sock_unix = Socket::new(Domain::UNIX, Type::STREAM, None).expect("Unix domain socket creation should succeed");
    drop(sock_unix);

    println!("All socket2::Domain contract assertions passed successfully.");
}