coreutils/src/hashsum/hashsum.rs
2014-10-19 11:54:17 -07:00

318 lines
12 KiB
Rust

#![crate_name = "hashsum"]
/*
* This file is part of the uutils coreutils package.
*
* (c) Arcterus <arcterus@mail.com>
* (c) Vsevolod Velichko <torkvemada@sorokdva.net>
* (c) Gil Cottle <gcottle@redtown.org>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
#![feature(macro_rules)]
extern crate regex;
extern crate "rust-crypto" as crypto;
extern crate getopts;
use std::io::fs::File;
use std::io::stdio::stdin_raw;
use std::io::BufferedReader;
use std::io::IoError;
use std::io::EndOfFile;
use regex::Regex;
use crypto::digest::Digest;
use crypto::md5::Md5;
use crypto::sha1::Sha1;
use crypto::sha2::{Sha224, Sha256, Sha384, Sha512};
#[path = "../common/util.rs"]
mod util;
static NAME: &'static str = "hashsum";
static VERSION: &'static str = "1.0.0";
fn is_custom_binary(program: &str) -> bool {
match program {
"md5sum" | "sha1sum"
| "sha224sum" | "sha256sum"
| "sha384sum" | "sha512sum" => true,
_ => false
}
}
fn get_algo_opts(program: &str) -> Vec<getopts::OptGroup> {
if is_custom_binary(program) {
Vec::new()
} else {
vec!(
getopts::optflag("", "md5", "work with MD5"),
getopts::optflag("", "sha1", "work with SHA1"),
getopts::optflag("", "sha224", "work with SHA224"),
getopts::optflag("", "sha256", "work with SHA256"),
getopts::optflag("", "sha384", "work with SHA384"),
getopts::optflag("", "sha512", "work with SHA512")
)
}
}
fn detect_algo(program: &str, matches: &getopts::Matches) -> (&'static str, Box<Digest+'static>) {
let mut alg: Option<Box<Digest>> = None;
let mut name: &'static str = "";
match program {
"md5sum" => ("MD5", box Md5::new() as Box<Digest>),
"sha1sum" => ("SHA1", box Sha1::new() as Box<Digest>),
"sha224sum" => ("SHA224", box Sha224::new() as Box<Digest>),
"sha256sum" => ("SHA256", box Sha256::new() as Box<Digest>),
"sha384sum" => ("SHA384", box Sha384::new() as Box<Digest>),
"sha512sum" => ("SHA512", box Sha512::new() as Box<Digest>),
_ => {
{
let set_or_crash = |n, val| -> () {
if alg.is_some() { crash!(1, "You cannot combine multiple hash algorithms!") };
name = n;
alg = Some(val);
};
if matches.opt_present("md5") { set_or_crash("MD5", box Md5::new()) };
if matches.opt_present("sha1") { set_or_crash("SHA1", box Sha1::new()) };
if matches.opt_present("sha224") { set_or_crash("SHA224", box Sha224::new()) };
if matches.opt_present("sha256") { set_or_crash("SHA256", box Sha256::new()) };
if matches.opt_present("sha384") { set_or_crash("SHA384", box Sha384::new()) };
if matches.opt_present("sha512") { set_or_crash("SHA512", box Sha512::new()) };
}
if alg.is_none() { crash!(1, "You must specify hash algorithm!") };
(name, alg.unwrap())
}
}
}
pub fn uumain(args: Vec<String>) -> int {
let program = args[0].clone();
let binary = Path::new(program.as_slice());
let binary_name = binary.filename_str().unwrap();
// Default binary in Windows, text mode otherwise
let binary_flag_default = cfg!(windows);
let mut opts: Vec<getopts::OptGroup> = vec!(
getopts::optflag("b", "binary", format!("read in binary mode{}", if binary_flag_default { " (default)" } else { "" }).as_slice()),
getopts::optflag("c", "check", "read hashsums from the FILEs and check them"),
getopts::optflag("", "tag", "create a BSD-style checksum"),
getopts::optflag("t", "text", format!("read in text mode{}", if binary_flag_default { "" } else { " (default)" }).as_slice()),
getopts::optflag("q", "quiet", "don't print OK for each successfully verified file"),
getopts::optflag("s", "status", "don't output anything, status code shows success"),
getopts::optflag("", "strict", "exit non-zero for improperly formatted checksum lines"),
getopts::optflag("w", "warn", "warn about improperly formatted checksum lines"),
getopts::optflag("h", "help", "display this help and exit"),
getopts::optflag("V", "version", "output version information and exit"),
);
opts.extend(get_algo_opts(binary_name.as_slice()).into_iter());
let matches = match getopts::getopts(args.tail(), opts.as_slice()) {
Ok(m) => m,
Err(f) => crash!(1, "{}", f)
};
if matches.opt_present("help") {
usage(program.as_slice(), binary_name.as_slice(), opts.as_slice());
} else if matches.opt_present("version") {
version();
} else {
let (name, algo) = detect_algo(binary_name.as_slice(), &matches);
let binary_flag = matches.opt_present("binary");
let text_flag = matches.opt_present("text");
if binary_flag && text_flag {
crash!(1, "cannot set binary and text mode at the same time");
}
let binary = if binary_flag { true } else if text_flag { false } else { binary_flag_default };
let check = matches.opt_present("check");
let tag = matches.opt_present("tag");
let status = matches.opt_present("status");
let quiet = matches.opt_present("quiet") || status;
let strict = matches.opt_present("strict");
let warn = matches.opt_present("warn") && !status;
let files = if matches.free.is_empty() {
vec!("-".to_string())
} else {
matches.free
};
match hashsum(name, algo, files, binary, check, tag, status, quiet, strict, warn) {
Ok(()) => return 0,
Err(e) => return e
}
}
0
}
fn version() {
pipe_println!("{} v{}", NAME, VERSION);
}
fn usage(program: &str, binary_name: &str, opts: &[getopts::OptGroup]) {
version();
pipe_println!("");
pipe_println!("Usage:");
if is_custom_binary(binary_name) {
pipe_println!(" {} [OPTION]... [FILE]...", program);
} else {
pipe_println!(" {} {{--md5|--sha1|--sha224|--sha256|--sha384|--sha512}} [OPTION]... [FILE]...", program);
}
pipe_println!("");
pipe_print!("{}", getopts::usage("Compute and check message digests.", opts));
}
fn hashsum(algoname: &str, mut digest: Box<Digest>, files: Vec<String>, binary: bool, check: bool, tag: bool, status: bool, quiet: bool, strict: bool, warn: bool) -> Result<(), int> {
let mut bad_format = 0u;
let mut failed = 0u;
let binary_marker = if binary {
"*"
} else {
" "
};
for filename in files.iter() {
let filename: &str = filename.as_slice();
let mut stdin_buf;
let mut file_buf;
let mut file = BufferedReader::new(
if filename == "-" {
stdin_buf = stdin_raw();
&mut stdin_buf as &mut Reader
} else {
file_buf = safe_unwrap!(File::open(&Path::new(filename)));
&mut file_buf as &mut Reader
}
);
if check {
// Set up Regexes for line validation and parsing
let bytes = digest.output_bits() / 4;
let gnu_re = safe_unwrap!(
Regex::new(
format!(
r"^(?P<digest>[a-fA-F0-9]{{{}}}) (?P<binary>[ \*])(?P<fileName>.*)",
bytes
).as_slice()
)
);
let bsd_re = safe_unwrap!(
Regex::new(
format!(
r"^{algorithm} \((?P<fileName>.*)\) = (?P<digest>[a-fA-F0-9]{{{digest_size}}})",
algorithm = algoname,
digest_size = bytes
).as_slice()
)
);
let mut buffer = file;
for (i, line) in buffer.lines().enumerate() {
let line = safe_unwrap!(line);
let (ck_filename, sum, binary_check) = match gnu_re.captures(line.as_slice()) {
Some(caps) => (caps.name("fileName"), caps.name("digest").to_ascii().to_lowercase(), caps.name("binary") == "*"),
None => match bsd_re.captures(line.as_slice()) {
Some(caps) => (caps.name("fileName"), caps.name("digest").to_ascii().to_lowercase(), true),
None => {
bad_format += 1;
if strict {
return Err(1);
}
if warn {
show_warning!("{}: {}: improperly formatted {} checksum line", filename, i + 1, algoname);
}
continue;
}
}
};
let real_sum = safe_unwrap!(digest_reader(&mut digest, &mut safe_unwrap!(File::open(&Path::new(ck_filename))), binary_check))
.as_slice().to_ascii().to_lowercase();
if sum.as_slice() == real_sum.as_slice() {
if !quiet {
pipe_println!("{}: OK", ck_filename);
}
} else {
if !status {
pipe_println!("{}: FAILED", ck_filename);
}
failed += 1;
}
}
} else {
let sum = safe_unwrap!(digest_reader(&mut digest, &mut file, binary));
if tag {
pipe_println!("{} ({}) = {}", algoname, filename, sum);
} else {
pipe_println!("{} {}{}", sum, binary_marker, filename);
}
}
}
if !status {
if bad_format == 1 {
show_warning!("{} line is improperly formatted", bad_format);
} else if bad_format > 1 {
show_warning!("{} lines are improperly formatted", bad_format);
}
if failed > 0 {
show_warning!("{} computed checksum did NOT match", failed);
}
}
Ok(())
}
fn digest_reader(digest: &mut Box<Digest>, reader: &mut Reader, binary: bool) -> Result<String, IoError> {
digest.reset();
// Digest file, do not hold too much in memory at any given moment
let windows = cfg!(windows);
let mut buffer = [0, ..524288];
let mut vec = Vec::with_capacity(524288);
let mut looking_for_newline = false;
loop {
match reader.read(buffer) {
Ok(0) => {},
Ok(nread) => {
if windows && !binary {
// Windows text mode returns '\n' when reading '\r\n'
for i in range(0, nread) {
if looking_for_newline {
if buffer[i] != ('\n' as u8) {
vec.push('\r' as u8);
}
if buffer[i] != ('\r' as u8) {
vec.push(buffer[i]);
looking_for_newline = false;
}
} else if buffer[i] != ('\r' as u8) {
vec.push(buffer[i]);
} else {
looking_for_newline = true;
}
}
digest.input(vec.as_slice());
vec.clear();
} else {
digest.input(buffer.slice(0, nread));
}
},
Err(e) => match e.kind {
EndOfFile => {
break;
},
_ => {
return Err(e);
}
}
}
}
if windows && looking_for_newline {
vec.push('\r' as u8);
digest.input(vec.as_slice());
}
Ok(digest.result_str())
}