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first working version

This commit is contained in:
Florian Stecker 2022-11-20 14:35:14 -05:00
commit 4a22e30467
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1
.gitignore vendored Normal file
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/target

517
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Cargo.toml Normal file
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[package]
name = "imapidle"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
anyhow = "1.0.66"
clap = { version = "4.0.26", features = ["derive"] }
rustls = "0.20.7"
rustls-native-certs = "0.6.2"
webpki-roots = "0.22.5"

134
src/lib.rs Normal file
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use rustls::{OwnedTrustAnchor, ClientConfig, RootCertStore, ClientConnection};
use anyhow::{Result as AResult, anyhow};
use std::sync::Arc;
use std::net::TcpStream;
use std::io::{Read, Write};
use std::process::Command;
use std::time::Duration;
use std::path::PathBuf;
use clap::Parser;
#[derive(Parser)]
#[command(about = "Uses IMAP IDLE to run a command whenever a new email arrives", long_about = None)]
pub struct Cli {
/// IMAP server domain
#[arg(short, long)]
server: String,
/// IMAP server port
#[arg(long, default_value_t = 993)]
port: u16,
/// IMAP user name
#[arg(short, long)]
username: String,
/// IMAP password
#[arg(short, long)]
password: String,
/// command to run when new mail arrives
#[arg(short, long)]
command: PathBuf,
#[arg(short, long, action = clap::ArgAction::Count)]
verbose: u8,
}
#[derive(PartialEq, Eq, Debug)]
enum State {
Unauthenticated,
Authenticated,
Inbox,
Idling
}
pub fn run(cli: &Cli) -> AResult<()> {
let tls_config = ClientConfig::builder()
.with_safe_defaults()
.with_root_certificates(RootCertStore {
roots: webpki_roots::TLS_SERVER_ROOTS.0.iter()
.map(|ta| OwnedTrustAnchor::from_subject_spki_name_constraints(
ta.subject, ta.spki, ta.name_constraints))
.collect()
})
.with_no_client_auth();
let mut buffer = [0; 2048];
let mut tls_client = ClientConnection::new(
Arc::new(tls_config),
cli.server.as_str().try_into().unwrap())?;
let mut socket = TcpStream::connect((cli.server.as_str(), cli.port))?;
let mut state = State::Unauthenticated;
socket.set_read_timeout(Some(Duration::from_secs(10*60)))?;
// println!("read timeout = {:?}, write timeout = {:?}", socket.read_timeout(), socket.write_timeout());
loop {
// println!("wants_read = {}, wants_write = {}, is_handshaking = {}",
// tls_client.wants_read(),
// tls_client.wants_write(),
// tls_client.is_handshaking());
if tls_client.is_handshaking() {
let (_i, _o) = tls_client.complete_io(&mut socket)?;
// println!("handshake, read {_i} bytes, wrote {_o} bytes");
} else if tls_client.wants_write() {
let _o = tls_client.write_tls(&mut socket)?;
// println!("wrote {_o} bytes");
} else if tls_client.wants_read() {
let _i = tls_client.read_tls(&mut socket)?;
// println!("read {_i} TLS bytes");
if tls_client.process_new_packets()?.plaintext_bytes_to_read() == 0 {
continue;
}
let len = tls_client.reader().read(&mut buffer)?;
// println!("read {len} plain bytes");
let responses = buffer[0..len]
.split(|&x|x == b'\r' || x == b'\n')
.filter(|&x|x.len() != 0);
for response in responses {
if cli.verbose > 0 {
println!("{}", String::from_utf8_lossy(response));
}
match state {
State::Unauthenticated => if response.starts_with(b"* OK") {
let request = format!("A001 login {} {}\r\n", cli.username, cli.password);
tls_client.writer().write(request.as_bytes())?;
state = State::Authenticated;
},
State::Authenticated => if response.starts_with(b"A001 OK") {
tls_client.writer().write(b"A002 select inbox\r\n")?;
state = State::Inbox;
} else if response.starts_with(b"A001") {
return Err(anyhow!("The server rejected authentication"));
},
State::Inbox => if response.starts_with(b"A002 OK") {
tls_client.writer().write(b"A003 idle\r\n")?;
state = State::Idling;
} else if response.starts_with(b"A002") {
return Err(anyhow!("Selecting inbox failed"));
},
State::Idling => if response.starts_with(b"+ idling") {
println!("Connected and idling ...");
} else if response.starts_with(b"*") && response.ends_with(b"EXISTS") {
println!("NEW EMAIL!");
Command::new(cli.command.as_os_str())
.output()?;
}
}
}
} else {
break;
}
}
Ok(())
}

43
src/main.rs Normal file
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@ -0,0 +1,43 @@
#![feature(io_error_more)]
use anyhow::Result as AResult;
use std::io::{Error as IOError, ErrorKind};
use std::thread;
use std::time::Duration;
use clap::Parser;
const CONNECTION_ERRORS: &[ErrorKind] = &[
ErrorKind::ConnectionAborted,
ErrorKind::ConnectionReset,
ErrorKind::NetworkUnreachable,
ErrorKind::HostUnreachable
];
fn main() -> AResult<()> {
let cli = imapidle::Cli::parse();
loop {
return match imapidle::run(&cli) {
Ok(_) => Ok(()),
Err(err) => match err.downcast_ref::<IOError>() {
Some(io_err) if io_err.kind() == ErrorKind::WouldBlock => {
let secs_to_reconnect = 10;
println!("Timed out, reconnecting in {secs_to_reconnect} seconds");
thread::sleep(Duration::from_secs(secs_to_reconnect));
continue;
},
Some(io_err) if CONNECTION_ERRORS.contains(&io_err.kind()) => {
let secs_to_reconnect = 10*60;
println!("Cannot connect currently, retrying in {secs_to_reconnect} seconds");
thread::sleep(Duration::from_secs(secs_to_reconnect));
continue;
},
Some(io_err) => {
println!("{:?}", io_err.kind());
Err(err)
}
_ => Err(err)
}
}
}
}