socket2 0.6.5: socket2::Protocol

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# socket2 0.6.5 Protocol API Contracts

## What `search_known_solution` answered
`search_known_solution` returned NO_SAFE_MATCH for `socket2::Protocol` in `pkg:cargo/socket2@0.6.5`.

## What a model would have written instead
A model may assume that `socket.protocol()` is available on `Socket` unconditionally or try to decode socket options manually without using `Protocol::from`. Additionally, models often miss that `socket.protocol()` requires the `"all"` feature flag in `socket2`.

## How the wrong version fails
Without `features = ["all"]`, calling `socket.protocol()` fails at compile time with `error[E0599]: no method named protocol found for struct Socket in the current scope`. Furthermore, treating `Protocol` as an enum rather than a newtype wrapper around `c_int` leads to type mismatch errors.

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::Protocol 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::Protocol

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:sha256:33398b2c47d67727f4ac49f1595ea6e534fecef4c3404a79a0e470fe6c05cde5","contract":["Protocol constants TCP, UDP, ICMPV4, and ICMPV6 match standard protocol numbers","Protocol converts to and from raw integer representation using From and Into","Protocol implements PartialEq, Eq, Clone, Copy, and Debug formatting","Protocol can be passed to Socket::new to create a socket and queried via Socket::protocol"],"goal":"verify socket2::Protocol in pkg:cargo/socket2@0.6.5","kind":"HOW","packages":["pkg:cargo/socket2@0.6.5"],"schemaVersion":1,"symbols":["socket2::Protocol"]},"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::Protocol"],"verifierAdapter":"cargo@1"}

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

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

pub use socket2::Protocol;

use socket2::{Domain, Protocol, Socket, Type};
use std::os::raw::c_int;

fn main() {
    // 1. Protocol constants TCP, UDP, ICMPV4, and ICMPV6 match standard protocol numbers
    let tcp_val: c_int = Protocol::TCP.into();
    let udp_val: c_int = Protocol::UDP.into();
    let icmpv4_val: c_int = Protocol::ICMPV4.into();
    let icmpv6_val: c_int = Protocol::ICMPV6.into();

    assert_eq!(tcp_val, 6);
    assert_eq!(udp_val, 17);
    assert_eq!(icmpv4_val, 1);
    assert_eq!(icmpv6_val, 58);

    // 2. Protocol converts to and from raw integer representation using From and Into
    assert_eq!(Protocol::from(tcp_val), Protocol::TCP);
    assert_eq!(Protocol::from(udp_val), Protocol::UDP);
    assert_eq!(Protocol::from(icmpv4_val), Protocol::ICMPV4);
    assert_eq!(Protocol::from(icmpv6_val), Protocol::ICMPV6);

    let custom = Protocol::from(250);
    let custom_val: c_int = custom.into();
    assert_eq!(custom_val, 250);

    // 3. Protocol implements PartialEq, Eq, Clone, Copy, and Debug formatting
    assert_ne!(Protocol::TCP, Protocol::UDP);
    assert_eq!(Protocol::TCP, Protocol::TCP.clone());
    let copy_tcp = Protocol::TCP;
    assert_eq!(copy_tcp, Protocol::TCP);
    assert_eq!(format!("{:?}", Protocol::TCP), "IPPROTO_TCP");
    assert_eq!(format!("{:?}", Protocol::UDP), "IPPROTO_UDP");
    assert_eq!(format!("{:?}", custom), "250");

    // 4. Protocol can be passed to Socket::new to create a socket and queried via Socket::protocol
    let socket = Socket::new(Domain::IPV4, Type::STREAM, Some(Protocol::TCP))
        .expect("failed to create IPv4 TCP socket");
    let proto = socket.protocol().expect("failed to retrieve socket protocol");
    assert_eq!(proto, Some(Protocol::TCP));

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