Added groups and clear applets

This commit is contained in:
Nathan Fisher 2023-01-12 18:33:41 -05:00
parent d77387f963
commit 2f58e82de2
5 changed files with 169 additions and 9 deletions

28
src/cmd/clear/mod.rs Normal file
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@ -0,0 +1,28 @@
use clap::Command;
use super::Cmd;
#[derive(Debug, Default)]
pub struct Clear;
impl Cmd for Clear {
fn name(&self) -> &str {
"clear"
}
fn cli(&self) -> Command {
Command::new("clear")
.about("clear the terminal's screen")
.author("Nathan Fisher")
.version(env!("CARGO_PKG_VERSION"))
}
fn run(&self, _matches: Option<&clap::ArgMatches>) -> Result<(), Box<dyn std::error::Error>> {
print!("\x1b[2J\x1b[H");
print!("\x1b[3J\x1b[H");
Ok(())
}
fn path(&self) -> Option<crate::Path> {
Some(crate::Path::UsrBin)
}
}

55
src/cmd/groups/mod.rs Normal file
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@ -0,0 +1,55 @@
use super::Cmd;
use crate::pw;
use clap::{Arg, Command};
use std::io;
#[derive(Debug, Default)]
pub struct Groups;
impl Cmd for Groups {
fn name(&self) -> &str {
"groups"
}
fn cli(&self) -> clap::Command {
Command::new("groups")
.about("display current group names")
.author("Nathan Fisher")
.version(env!("CARGO_PKG_VERSION"))
.after_help(
"The groups command displays the current group names or ID values. \
If the value does not have a corresponding entry in /etc/group, the \
value will be displayed as the numerical group value. The optional \
user parameter will display the groups for the named user.",
)
.arg(Arg::new("user"))
}
fn run(&self, matches: Option<&clap::ArgMatches>) -> Result<(), Box<dyn std::error::Error>> {
let Some(matches) = matches else {
return Err(Box::new(io::Error::new(io::ErrorKind::Other, "no input")))
};
let groups = match matches.get_one::<String>("user") {
Some(u) => {
pw::get_group_names_for_name(&u)?
},
None => {
pw::get_group_names()?
},
};
let len = groups.len();
for (idx, group) in groups.into_iter().enumerate() {
if idx < len - 1 {
print!("{group} ");
} else {
println!("{group}");
}
}
Ok(())
}
fn path(&self) -> Option<crate::Path> {
Some(crate::Path::UsrBin)
}
}

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@ -7,6 +7,7 @@ pub mod basename;
pub mod bootstrap;
mod cat;
mod chmod;
pub mod clear;
mod cp;
mod date;
mod dd;
@ -16,6 +17,7 @@ pub mod factor;
pub mod r#false;
pub mod fold;
mod getty;
pub mod groups;
pub mod head;
pub mod hostname;
mod ln;
@ -38,9 +40,9 @@ pub mod yes;
pub use {
self::hostname::Hostname, base32::Base32, base64::Base64, basename::Basename,
bootstrap::Bootstrap, dirname::Dirname, echo::Echo, factor::Factor, fold::Fold, head::Head,
mountpoint::Mountpoint, nologin::Nologin, nproc::Nproc, r#false::False, r#true::True, rev::Rev,
shitbox::Shitbox, sleep::Sleep, which::Which, whoami::Whoami, yes::Yes,
bootstrap::Bootstrap, clear::Clear, dirname::Dirname, echo::Echo, factor::Factor, fold::Fold, groups::Groups,
head::Head, mountpoint::Mountpoint, nologin::Nologin, nproc::Nproc, r#false::False,
r#true::True, rev::Rev, shitbox::Shitbox, sleep::Sleep, which::Which, whoami::Whoami, yes::Yes,
};
pub trait Cmd: fmt::Debug + Sync {
@ -56,11 +58,13 @@ pub fn get(name: &str) -> Option<Box<dyn Cmd>> {
"base32" => Some(Box::new(Base32::default())),
"basename" => Some(Box::new(Basename::default())),
"bootstrap" => Some(Box::new(Bootstrap::default())),
"clear" => Some(Box::new(Clear::default())),
"dirname" => Some(Box::new(Dirname::default())),
"echo" => Some(Box::new(Echo::default())),
"factor" => Some(Box::new(Factor::default())),
"false" => Some(Box::new(False::default())),
"fold" => Some(Box::new(Fold::default())),
"groups" => Some(Box::new(Groups::default())),
"head" => Some(Box::new(Head::default())),
"mountpoint" => Some(Box::new(Mountpoint::default())),
"nologin" => Some(Box::new(Nologin::default())),
@ -76,16 +80,18 @@ pub fn get(name: &str) -> Option<Box<dyn Cmd>> {
}
}
pub static COMMANDS: [&'static str; 21] = [
pub static COMMANDS: [&'static str; 23] = [
"base32",
"base64",
"basename",
"bootstrap",
"clear",
"dirname",
"echo",
"false",
"factor",
"fold",
"groups",
"head",
"hostname",
"mountpoint",

View File

@ -62,9 +62,7 @@ fn which(command: &str, path: &[&str]) -> Option<String> {
if let Ok(exe) = File::open(&file) {
if let Ok(meta) = exe.metadata() {
let mode = meta.mode();
let myuid = unsafe {
libc::geteuid()
};
let myuid = unsafe { libc::geteuid() };
let mygroups = crate::pw::get_gids();
// we own the file and it has u+x
if myuid == meta.uid() && mode & 0o100 != 0 {

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@ -1,4 +1,4 @@
use std::{error::Error, ffi::CStr, num};
use std::{error::Error, ffi::{CStr, CString, c_int}, num, io};
pub fn get_username<'a>() -> Result<&'a str, std::str::Utf8Error> {
let user = unsafe {
@ -20,6 +20,38 @@ pub fn get_eusername<'a>() -> Result<&'a str, std::str::Utf8Error> {
user.to_str()
}
pub fn get_uid_for_name(name: &str) -> Option<u32> {
let user = match CString::new(name.as_bytes()) {
Ok(n) => n,
Err(_) => return None,
};
let uid = unsafe {
let pw = libc::getpwnam(user.as_ptr());
if pw.is_null() {
None
} else {
Some((*pw).pw_uid)
}
};
uid
}
pub fn get_pgid_for_name(name: &str) -> Option<u32> {
let user = match CString::new(name.as_bytes()) {
Ok(n) => n,
Err(_) => return None,
};
let gid = unsafe {
let pw = libc::getpwnam(user.as_ptr());
if pw.is_null() {
None
} else {
Some((*pw).pw_gid)
}
};
gid
}
pub fn get_grpname<'a>() -> Result<&'a str, std::str::Utf8Error> {
let group = unsafe {
let gid = libc::getgid();
@ -53,16 +85,57 @@ pub fn get_gids() -> Result<Vec<u32>, num::TryFromIntError> {
Ok(buf)
}
pub fn get_gids_for_name(name: &str) -> Result<Vec<u32>, Box<dyn Error>> {
let gid = match get_pgid_for_name(name) {
Some(g) => g as libc::gid_t,
None => return Err(Box::new(io::Error::new(io::ErrorKind::Other, "cannot get primary group"))),
};
let mut buf: Vec<libc::gid_t> = vec![0; 1024];
let name = CString::new(name.as_bytes())?;
let mut ct: c_int = 1024;
unsafe {
let res = libc::getgrouplist(name.as_ptr(), gid, buf.as_mut_ptr(), &mut ct);
if res < 0 {
return Err(Box::new(io::Error::new(io::ErrorKind::Other, "too many groups")))
}
}
Ok(buf[0..ct as usize].iter().map(|x| *x as u32).collect())
}
pub fn get_group_names() -> Result<Vec<String>, Box<dyn Error>> {
let gids = get_gids()?;
let mut names = vec![];
for id in gids {
let name = unsafe {
let gr = libc::getgrgid(id);
let gr = libc::getgrgid(id);
if gr.is_null() {
id.to_string()
} else {
let name = (*gr).gr_name;
// if we don't take ownership here the OS can (and will)
// reuse the memory
CStr::from_ptr(name).to_str()?.to_string()
}
};
names.push(name);
}
Ok(names)
}
pub fn get_group_names_for_name(name: &str) -> Result<Vec<String>, Box<dyn Error>> {
let gids = get_gids_for_name(name)?;
let mut names = vec![];
for id in gids {
let name = unsafe {
let gr = libc::getgrgid(id);
if gr.is_null() {
id.to_string()
} else {
let name = (*gr).gr_name;
// if we don't take ownership here the OS can (and will)
// reuse the memory
CStr::from_ptr(name).to_str()?.to_string()
}
};
names.push(name);
}