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#![allow(unused_must_use)]
#[macro_use]
extern crate uucore;
use clap::{App, Arg};
use std::fs;
use std::io::{ErrorKind, Write};
enum Mode {
Default,
Basic,
Extra,
Both,
}
static NAME: &str = "pathchk";
static VERSION: &str = env!("CARGO_PKG_VERSION");
static ABOUT: &str = "Check whether file names are valid or portable";
mod options {
pub const POSIX: &str = "posix";
pub const POSIX_SPECIAL: &str = "posix-special";
pub const PORTABILITY: &str = "portability";
pub const PATH: &str = "path";
}
const POSIX_PATH_MAX: usize = 256;
const POSIX_NAME_MAX: usize = 14;
fn get_usage() -> String {
format!("{0} [OPTION]... NAME...", executable!())
}
pub fn uumain(args: impl uucore::Args) -> i32 {
let usage = get_usage();
let matches = App::new(executable!())
.version(VERSION)
.about(ABOUT)
.usage(&usage[..])
.arg(
Arg::with_name(options::POSIX)
.short("p")
.help("check for most POSIX systems"),
)
.arg(
Arg::with_name(options::POSIX_SPECIAL)
.short("P")
.help(r#"check for empty names and leading "-""#),
)
.arg(
Arg::with_name(options::PORTABILITY)
.long(options::PORTABILITY)
.help("check for all POSIX systems (equivalent to -p -P)"),
)
.arg(Arg::with_name(options::PATH).hidden(true).multiple(true))
.get_matches_from(args);
let is_posix = matches.values_of(options::POSIX).is_some();
let is_posix_special = matches.values_of(options::POSIX_SPECIAL).is_some();
let is_portability = matches.values_of(options::PORTABILITY).is_some();
let mode = if (is_posix && is_posix_special) || is_portability {
Mode::Both
} else if is_posix {
Mode::Basic
} else if is_posix_special {
Mode::Extra
} else {
Mode::Default
};
let paths = matches.values_of(options::PATH);
let mut res = if paths.is_none() {
show_error!("missing operand\nTry {} --help for more information", NAME);
false
} else {
true
};
if res {
for p in paths.unwrap() {
let mut path = Vec::new();
for path_segment in p.split('/') {
path.push(path_segment.to_string());
}
res &= check_path(&mode, &path);
}
}
if res {
0
} else {
1
}
}
fn check_path(mode: &Mode, path: &[String]) -> bool {
match *mode {
Mode::Basic => check_basic(&path),
Mode::Extra => check_default(&path) && check_extra(&path),
Mode::Both => check_basic(&path) && check_extra(&path),
_ => check_default(&path),
}
}
fn check_basic(path: &[String]) -> bool {
let joined_path = path.join("/");
let total_len = joined_path.len();
if total_len > POSIX_PATH_MAX {
writeln!(
&mut std::io::stderr(),
"limit {} exceeded by length {} of file name {}",
POSIX_PATH_MAX,
total_len,
joined_path
);
return false;
} else if total_len == 0 {
writeln!(&mut std::io::stderr(), "empty file name");
return false;
}
for p in path {
let component_len = p.len();
if component_len > POSIX_NAME_MAX {
writeln!(
&mut std::io::stderr(),
"limit {} exceeded by length {} of file name component '{}'",
POSIX_NAME_MAX,
component_len,
p
);
return false;
}
if !check_portable_chars(&p) {
return false;
}
}
check_searchable(&joined_path)
}
fn check_extra(path: &[String]) -> bool {
for p in path {
if !no_leading_hyphen(&p) {
writeln!(
&mut std::io::stderr(),
"leading hyphen in file name component '{}'",
p
);
return false;
}
}
if path.join("/").is_empty() {
writeln!(&mut std::io::stderr(), "empty file name");
return false;
}
true
}
fn check_default(path: &[String]) -> bool {
let joined_path = path.join("/");
let total_len = joined_path.len();
if total_len > libc::PATH_MAX as usize {
writeln!(
&mut std::io::stderr(),
"limit {} exceeded by length {} of file name '{}'",
libc::PATH_MAX,
total_len,
joined_path
);
return false;
}
for p in path {
let component_len = p.len();
if component_len > libc::FILENAME_MAX as usize {
writeln!(
&mut std::io::stderr(),
"limit {} exceeded by length {} of file name component '{}'",
libc::FILENAME_MAX,
component_len,
p
);
return false;
}
}
check_searchable(&joined_path)
}
fn check_searchable(path: &str) -> bool {
match fs::symlink_metadata(path) {
Ok(_) => true,
Err(e) => {
if e.kind() == ErrorKind::NotFound {
true
} else {
writeln!(&mut std::io::stderr(), "{}", e);
false
}
}
}
}
fn no_leading_hyphen(path_segment: &str) -> bool {
!path_segment.starts_with('-')
}
fn check_portable_chars(path_segment: &str) -> bool {
let valid_str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789._-".to_string();
for ch in path_segment.chars() {
if !valid_str.contains(ch) {
writeln!(
&mut std::io::stderr(),
"nonportable character '{}' in file name component '{}'",
ch,
path_segment
);
return false;
}
}
true
}