Setup code for integration tests

vuinputd-tests/Cargo.toml

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+[package]
+name = "vuinputd-tests"
+version = "0.1.0"
+edition = "2021"
+
+[[bin]]
+name = "keyboard-in-container"
+
+[dependencies]
+uinput-ioctls = { path = "../uinput-ioctls" }
+nix = { version = "0.30", features = ["ioctl"] } # ioctl & libc bindings
+libc = "0.2"        # raw system calls
+libudev = "0.3" # enumerate-udev
+
+[features]
+requires-root = []
+requires-uinput = []

vuinputd-tests/src/bin/keyboard-in-container.rs

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+// SPDX-License-Identifier: MIT
+//
+// Author: Johannes Leupolz <dev@leupolz.eu>
+
+use libc::uinput_setup;
+use libc::{c_int, close, open, write, O_NONBLOCK, O_WRONLY};
+use std::ffi::{CStr, CString};
+use std::io;
+use std::mem::{size_of, zeroed};
+use std::os::raw::{c_char, c_void};
+use std::ptr;
+use std::thread::sleep;
+use std::time::Duration;
+pub use uinput_ioctls::*;
+
+// Constants (same numeric values as in linux headers)
+const EV_SYN: i32 = 0x00;
+const EV_KEY: i32 = 0x01;
+const SYN_REPORT: i32 = 0;
+const BUS_USB: u16 = 0x03;
+
+/// Key codes. Those are used by udev to recognize a device as a keyboard.
+const KEY_ESC: i32 = 1;
+const KEY_1: i32 = 2;
+const KEY_2: i32 = 3;
+const KEY_3: i32 = 4;
+const KEY_4: i32 = 5;
+const KEY_5: i32 = 6;
+const KEY_6: i32 = 7;
+const KEY_7: i32 = 8;
+const KEY_8: i32 = 9;
+const KEY_9: i32 = 10;
+const KEY_0: i32 = 11;
+const KEY_MINUS: i32 = 12;
+const KEY_EQUAL: i32 = 13;
+const KEY_BACKSPACE: i32 = 14;
+const KEY_TAB: i32 = 15;
+const KEY_Q: i32 = 16;
+const KEY_W: i32 = 17;
+const KEY_E: i32 = 18;
+const KEY_R: i32 = 19;
+const KEY_T: i32 = 20;
+const KEY_Y: i32 = 21;
+const KEY_U: i32 = 22;
+const KEY_I: i32 = 23;
+const KEY_O: i32 = 24;
+const KEY_P: i32 = 25;
+const KEY_LEFTBRACE: i32 = 26;
+const KEY_RIGHTBRACE: i32 = 27;
+const KEY_ENTER: i32 = 28;
+const KEY_LEFTCTRL: i32 = 29;
+const KEY_A: i32 = 30;
+const KEY_S: i32 = 31;
+
+/// Space and other common keys
+const KEY_D: i32 = 32;
+const KEY_F: i32 = 33;
+const KEY_G: i32 = 34;
+const KEY_H: i32 = 35;
+const KEY_J: i32 = 36;
+const KEY_K: i32 = 37;
+const KEY_L: i32 = 38;
+const KEY_SEMICOLON: i32 = 39;
+const KEY_APOSTROPHE: i32 = 40;
+const KEY_GRAVE: i32 = 41;
+const KEY_LEFTSHIFT: i32 = 42;
+const KEY_BACKSLASH: i32 = 43;
+const KEY_Z: i32 = 44;
+const KEY_X: i32 = 45;
+const KEY_C: i32 = 46;
+const KEY_V: i32 = 47;
+const KEY_B: i32 = 48;
+const KEY_N: i32 = 49;
+const KEY_M: i32 = 50;
+const KEY_COMMA: i32 = 51;
+const KEY_DOT: i32 = 52;
+const KEY_SLASH: i32 = 53;
+const KEY_RIGHTSHIFT: i32 = 54;
+const KEY_KPASTERISK: i32 = 55;
+const KEY_LEFTALT: i32 = 56;
+const KEY_SPACE: i32 = 57;
+const KEY_CAPSLOCK: i32 = 58;
+
+/// Function keys
+const KEY_F1: i32 = 59;
+const KEY_F2: i32 = 60;
+const KEY_F3: i32 = 61;
+const KEY_F4: i32 = 62;
+const KEY_F5: i32 = 63;
+const KEY_F6: i32 = 64;
+const KEY_F7: i32 = 65;
+const KEY_F8: i32 = 66;
+const KEY_F9: i32 = 67;
+const KEY_F10: i32 = 68;
+const KEY_NUMLOCK: i32 = 69;
+const KEY_SCROLLLOCK: i32 = 70;
+const KEY_KP7: i32 = 71;
+const KEY_KP8: i32 = 72;
+const KEY_KP9: i32 = 73;
+const KEY_KPMINUS: i32 = 74;
+const KEY_KP4: i32 = 75;
+const KEY_KP5: i32 = 76;
+const KEY_KP6: i32 = 77;
+const KEY_KPPLUS: i32 = 78;
+const KEY_KP1: i32 = 79;
+const KEY_KP2: i32 = 80;
+const KEY_KP3: i32 = 81;
+const KEY_KP0: i32 = 82;
+const KEY_KPDOT: i32 = 83;
+
+/// Arrow keys and navigation
+const KEY_ZENKAKUHANKAKU: i32 = 85;
+const KEY_102ND: i32 = 86;
+const KEY_F11: i32 = 87;
+const KEY_F12: i32 = 88;
+const KEY_RO: i32 = 89;
+const KEY_KATAKANA: i32 = 90;
+const KEY_HIRAGANA: i32 = 91;
+const KEY_HENKAN: i32 = 92;
+const KEY_KATAKANAHIRAGANA: i32 = 93;
+const KEY_MUHENKAN: i32 = 94;
+const KEY_KPJPCOMMA: i32 = 95;
+const KEY_KPENTER: i32 = 96;
+const KEY_RIGHTCTRL: i32 = 97;
+const KEY_KPSLASH: i32 = 98;
+const KEY_SYSRQ: i32 = 99;
+const KEY_RIGHTALT: i32 = 100;
+const KEY_LINEFEED: i32 = 101;
+const KEY_HOME: i32 = 102;
+const KEY_UP: i32 = 103;
+const KEY_PAGEUP: i32 = 104;
+const KEY_LEFT: i32 = 105;
+const KEY_RIGHT: i32 = 106;
+const KEY_END: i32 = 107;
+const KEY_DOWN: i32 = 108;
+const KEY_PAGEDOWN: i32 = 109;
+const KEY_INSERT: i32 = 110;
+const KEY_DELETE: i32 = 111;
+
+/// Configure a full 101-key standard keyboard
+unsafe fn set_standard_keyboard_keys(fd: i32) -> Result<(), std::io::Error> {
+    // We need to set more bits so that systemd recognizes a keyboard as a keyboard.
+    // At least the first 32 bits are ESC, numbers, and Q to D, except KEY_RESERVED need to be considered.
+    // udev-builtin-input_id.c consideres the mask = 0xFFFFFFFE
+
+    // EV_KEY
+    ui_set_evbit(fd, EV_KEY.try_into().unwrap())?;
+
+    // All standard keys (1..101+)
+    let all_keys = [
+        // Modifier + main keys
+        KEY_ESC,
+        KEY_1,
+        KEY_2,
+        KEY_3,
+        KEY_4,
+        KEY_5,
+        KEY_6,
+        KEY_7,
+        KEY_8,
+        KEY_9,
+        KEY_0,
+        KEY_MINUS,
+        KEY_EQUAL,
+        KEY_BACKSPACE,
+        KEY_TAB,
+        KEY_Q,
+        KEY_W,
+        KEY_E,
+        KEY_R,
+        KEY_T,
+        KEY_Y,
+        KEY_U,
+        KEY_I,
+        KEY_O,
+        KEY_P,
+        KEY_LEFTBRACE,
+        KEY_RIGHTBRACE,
+        KEY_ENTER,
+        KEY_LEFTCTRL,
+        KEY_A,
+        KEY_S,
+        KEY_D,
+        KEY_F,
+        KEY_G,
+        KEY_H,
+        KEY_J,
+        KEY_K,
+        KEY_L,
+        KEY_SEMICOLON,
+        KEY_APOSTROPHE,
+        KEY_GRAVE,
+        KEY_LEFTSHIFT,
+        KEY_BACKSLASH,
+        KEY_Z,
+        KEY_X,
+        KEY_C,
+        KEY_V,
+        KEY_B,
+        KEY_N,
+        KEY_M,
+        KEY_COMMA,
+        KEY_DOT,
+        KEY_SLASH,
+        KEY_RIGHTSHIFT,
+        KEY_KPASTERISK,
+        KEY_LEFTALT,
+        KEY_SPACE,
+        KEY_CAPSLOCK,
+        // Function keys
+        KEY_F1,
+        KEY_F2,
+        KEY_F3,
+        KEY_F4,
+        KEY_F5,
+        KEY_F6,
+        KEY_F7,
+        KEY_F8,
+        KEY_F9,
+        KEY_F10,
+        KEY_F11,
+        KEY_F12,
+        KEY_NUMLOCK,
+        KEY_SCROLLLOCK,
+        // Keypad
+        KEY_KP7,
+        KEY_KP8,
+        KEY_KP9,
+        KEY_KPMINUS,
+        KEY_KP4,
+        KEY_KP5,
+        KEY_KP6,
+        KEY_KPPLUS,
+        KEY_KP1,
+        KEY_KP2,
+        KEY_KP3,
+        KEY_KP0,
+        KEY_KPDOT,
+        KEY_KPENTER,
+        KEY_KPSLASH,
+        KEY_KPJPCOMMA,
+        // Arrows / navigation
+        KEY_HOME,
+        KEY_UP,
+        KEY_PAGEUP,
+        KEY_LEFT,
+        KEY_RIGHT,
+        KEY_END,
+        KEY_DOWN,
+        KEY_PAGEDOWN,
+        KEY_INSERT,
+        KEY_DELETE,
+        KEY_RIGHTCTRL,
+        KEY_RIGHTALT,
+        // Optional Japanese / additional keys
+        KEY_ZENKAKUHANKAKU,
+        KEY_102ND,
+        KEY_RO,
+        KEY_KATAKANA,
+        KEY_HIRAGANA,
+        KEY_HENKAN,
+        KEY_KATAKANAHIRAGANA,
+        KEY_MUHENKAN,
+        KEY_LINEFEED,
+        KEY_SYSRQ,
+    ];
+
+    for &key in all_keys.iter() {
+        ui_set_keybit(fd, key.try_into().unwrap())?;
+    }
+
+    Ok(())
+}
+
+fn emit(fd: c_int, ev_type: i32, code: i32, val: i32) -> io::Result<()> {
+    // libc's input_event struct layout:
+    // struct input_event {
+    //   struct timeval time;
+    //   __u16 type;
+    //   __u16 code;
+    //   __s32 value;
+    // };
+    //
+    // libc provides input_event as `libc::input_event` on Linux.
+    let mut ie: libc::input_event = unsafe { zeroed() };
+
+    // time fields are ignored by kernel for synthetic events - set zero
+    ie.time.tv_sec = 0;
+    ie.time.tv_usec = 0;
+
+    // input_event fields: type and code are u16 in C; value is i32
+    ie.type_ = ev_type as u16; // note: in libc the field is `type_`
+    ie.code = code as u16;
+    ie.value = val as i32;
+
+    // write the struct to the uinput fd
+    let buf_ptr = &ie as *const libc::input_event as *const c_void;
+    let bytes = size_of::<libc::input_event>();
+
+    let written = unsafe { write(fd, buf_ptr, bytes) };
+    if written as usize != bytes {
+        return Err(io::Error::last_os_error());
+    }
+    Ok(())
+}
+
+fn main() -> io::Result<()> {
+    // open device - matches: open("/dev/uinput-test", O_WRONLY | O_NONBLOCK);
+    let path = CString::new("/dev/uinput-test").unwrap();
+    let fd = unsafe { open(path.as_ptr(), O_WRONLY | O_NONBLOCK) };
+    if fd < 0 {
+        eprintln!("error opening uinput");
+        return Err(io::Error::last_os_error());
+    }
+
+    // In your snippet you supplied value.into() to the wrappers. The wrappers may accept different types.
+    // We follow your earlier usage pattern:
+    unsafe {
+        let mut version_of_uinput = 0;
+        let pversion_of_uinput = std::ptr::from_mut(&mut version_of_uinput);
+        eprintln!("ioctl UI_GET_VERSION request");
+        ui_get_version(fd, pversion_of_uinput).unwrap_or_else(|e| {
+            eprintln!("ui_get_version failed: {:?}", e);
+            std::process::exit(1);
+        });
+        eprintln!("ioctl UI_GET_VERSION {}", version_of_uinput);
+
+        let _ = set_standard_keyboard_keys(fd).unwrap_or_else(|e| {
+            eprintln!("set_standard_keyboard_keys failed: {:?}", e);
+            std::process::exit(1);
+        });
+    }
+
+    // Prepare uinput_setup struct
+    let mut usetup: uinput_setup = unsafe { zeroed() };
+
+    // Fill id and name fields
+    // `id` has bustype, vendor, product fields (types may vary slightly by libc version)
+    // set bustype/vendor/product as in C example
+    // Note: make sure the fields exist as below in your libc version; adapt if names differ.
+    usetup.id.bustype = BUS_USB;
+    usetup.id.vendor = 0xbeef;
+    usetup.id.product = 0xdead;
+
+    // Copy device name into the C char array in the struct
+    let name = CString::new("Example device").unwrap();
+    // uinput_setup::name is usually [c_char; UINPUT_MAX_NAME_SIZE]
+    unsafe {
+        // Fill with zeros first (already zeroed by zeroed()) then copy bytes
+        let name_ptr = usetup.name.as_mut_ptr() as *mut c_char;
+        ptr::copy_nonoverlapping(name.as_ptr(), name_ptr, name.to_bytes_with_nul().len());
+    }
+
+    // Call IOCTLs to setup and create the device
+    // Assuming your wrappers accept (fd, ptr_to_usetup) etc.
+    // We'll pass pointer to usetup
+    let usetup_ptr = &mut usetup as *mut uinput_setup;
+    unsafe {
+        ui_dev_setup(fd, usetup_ptr).unwrap_or_else(|e| {
+            eprintln!("ui_dev_setup failed: {:?}", e);
+            close(fd);
+            std::process::exit(1);
+        });
+
+        ui_dev_create(fd).unwrap_or_else(|e| {
+            eprintln!("ui_dev_create failed: {:?}", e);
+            close(fd);
+            std::process::exit(1);
+        });
+
+        let mut resultbuf: [c_char; 64] = [0; 64];
+        ui_get_sysname(fd, &mut resultbuf).unwrap();
+        let sysname = CStr::from_ptr(resultbuf.as_ptr()).to_string_lossy();
+        eprintln!("sysname: {}", sysname);
+
+        // Sleep 1 second to allow userspace to detect the device (same as C example)
+        sleep(Duration::from_secs(10));
+
+        // Emit press + syn + release + syn
+        emit(fd, EV_KEY, KEY_SPACE, 1)?;
+        emit(fd, EV_SYN, SYN_REPORT, 0)?;
+        emit(fd, EV_KEY, KEY_SPACE, 0)?;
+        emit(fd, EV_SYN, SYN_REPORT, 0)?;
+
+        // Give userspace time to read events
+        sleep(Duration::from_secs(10));
+
+        // Destroy device and close fd
+        ui_dev_destroy(fd).unwrap_or_else(|e| {
+            eprintln!("ui_dev_destroy failed: {:?}", e);
+            close(fd);
+            std::process::exit(1);
+        });
+
+        close(fd);
+    }
+
+    Ok(())
+}

vuinputd-tests/tests/integration_tests.rs

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+use std::process::Command;
+
+#[cfg(all(feature = "requires-root", feature = "requires-uinput"))]
+#[test]
+fn test_keyboard_in_container() {
+    let keyboard_in_container = env!("CARGO_BIN_EXE_keyboard-in-container");
+
+    // Run the ns_child helper which unshares namespaces
+    let status = Command::new(keyboard_in_container)
+        .status()
+        .expect("failed to launch ns helper");
+
+    assert!(status.success());
+}