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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" diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..3cee5b4 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,134 @@ +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(()) +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..75f16cb --- /dev/null +++ b/src/main.rs @@ -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::() { + 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) + } + } + } +}