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use std::io::BufRead; use std::io::{BufReader, Write}; use std::net::TcpStream; #[cfg(feature = "with-rustls")] use { std::sync::Arc, std::io::Read, webpki::DNSNameRef, rustls::{ClientConfig, ClientSession, Session}, }; pub type Result<T> = std::result::Result<T, String>; pub struct Builder { #[cfg(feature = "with-rustls")] config: Arc<ClientConfig>, } impl Default for Builder { #[cfg(not(feature = "with-rustls"))] fn default() -> Self { Self {} } #[cfg(feature = "with-rustls")] fn default() -> Self { let mut config = ClientConfig::new(); config .root_store .add_server_trust_anchors(&webpki_roots::TLS_SERVER_ROOTS); let config = Arc::new(config); Self { config } } } impl Builder { #[cfg(not(feature = "with-rustls"))] pub fn connect(&mut self, host: &str, port: u16) -> Result<Client> { Client::connect_notls(host, port) } #[cfg(feature = "with-rustls")] pub fn connect(&mut self, host: &str, port: u16) -> Result<Client> { Client::connect_rustls(host, port, self.config.clone()) } #[cfg(feature = "with-rustls")] pub fn rustls_config(&mut self, config: ClientConfig) -> &mut Self { self.config = Arc::new(config); self } } pub struct Client { client: BufReader<TcpStream>, #[cfg(feature = "with-rustls")] tls: ClientSession, authorized: bool, } impl Client { pub fn connect(host: &str, port: u16) -> Result<Self> { Builder::default().connect(host, port) } pub fn login(&mut self, username: &str, password: &str) -> Result<()> { if self.authorized { return Err("login is only allowed in Authorization stage".to_string()); } let username_query = format!("USER {}\r\n", username); let password_query = format!("PASS {}\r\n", password); self.send(&username_query, false) .and_then(|s1| { self.send(&password_query, false) .map(|s2| format!("{}{}", s1, s2)) .map(|s| { self.authorized = true; s }) }) .map(|_| ()) } pub fn quit(mut self) -> Result<()> { self.send("QUIT\r\n", false) .map(|_| ()) } pub fn stat(&mut self) -> Result<(u32, u32)> { match self.send("STAT\r\n", false) { Err(e) => Err(e), Ok(ref s) => { let mut s = s.trim() .split(' ') .map(|i| i.parse::<u32>() .map_err(|e| e.to_string())); Ok(( s.next().ok_or_else(|| "INVALID_REPLY")??, s.next().ok_or_else(|| "INVALID_REPLY")??, )) } } } pub fn list(&mut self, msg: Option<u32>) -> Result<String> { let query = if let Some(num) = msg { format!("LIST {}\r\n", num) } else { "LIST\r\n".to_string() }; self.send(&query, msg.is_none()) } pub fn retr(&mut self, msg: u32) -> Result<String> { let query = format!("RETR {}\r\n", msg); self.send(&query, true) .map(|s| { s.split('\n') .skip(1) .collect::<Vec<&str>>() .join("\n") }) } pub fn dele(&mut self, msg: u32) -> Result<String> { let query = format!("DELE {}\r\n", msg); self.send(&query, false) } pub fn noop(&mut self) -> Result<()> { self.send("NOOP\r\n", false) .map(|_| ()) } pub fn rset(&mut self) -> Result<String> { self.send("RSET\r\n", false) } pub fn top(&mut self, msg: u32, n: u32) -> Result<String> { let query = format!("TOP {} {}\r\n", msg, n); self.send(&query, true) } pub fn uidl(&mut self, msg: Option<u32>) -> Result<String> { let query = if let Some(num) = msg { format!("UIDL {}\r\n", num) } else { "UIDL\r\n".to_string() }; self.send(&query, msg.is_none()) } pub fn apop(&mut self, name: String, digest: String) -> Result<String> { if self.authorized { return Err("login is only allowed in Authorization stage".to_string()); } let query = format!("APOP {} {}\r\n", name, digest); self.send(&query, false).map(|s| { self.authorized = true; s }) } #[cfg(not(feature = "with-rustls"))] fn connect_notls(host: &str, port: u16) -> Result<Self> { TcpStream::connect((host, port)) .map(|client| Self { client: BufReader::new(client), authorized: false, }) .map_err(|e| format!("{:?}", e)) .and_then(|mut client| { client .read_response(false) .map(|_| client) }) } #[cfg(feature = "with-rustls")] fn connect_rustls( host: &str, port: u16, config: Arc<ClientConfig> ) -> Result<Self> { let hostname = DNSNameRef::try_from_ascii_str(host) .map_err(|_| "DNS_NAMEREF_FAILED")?; TcpStream::connect((host, port)) .map(|client| Self { client: BufReader::new(client), tls: ClientSession::new(&config, hostname), authorized: false, }) .map_err(|e| format!("{:?}", e)) .and_then(|mut client| { let mut buf = String::new(); client .client .read_line(&mut buf) .map_err(|e| e.to_string()) .and_then(|_| { if buf.starts_with("+OK") { Ok(buf[4..].to_owned()) } else { Err(buf[5..].to_owned()) } }) .map(|_| client) }) .and_then(|mut client| { client .client .get_mut() .write_all("STLS\r\n".as_bytes()) .map_err(|e| e.to_string()) .and_then(|_| { let mut buf = String::new(); client .client .read_line(&mut buf) .map_err(|e| e.to_string()) .and_then(|_| { if buf.starts_with("+OK") { Ok(buf[4..].to_owned()) } else { Err(buf[5..].to_owned()) } }) }) .map(|_| client) }) } #[cfg(not(feature = "with-rustls"))] fn read_response(&mut self, multiline: bool) -> Result<String> { let mut response = String::new(); let mut buffer = String::new(); self.client .read_line(&mut buffer) .map_err(|e| e.to_string()) .and_then(|x| { if x == 0 { Err("Connection aborted".to_string()) } else { Ok(x) } }) .and_then(|_| { if buffer.starts_with("+OK") { Ok(buffer[4..].to_owned()) } else { Err(if buffer.len() < 6 { buffer.clone() } else { buffer[5..].to_owned() }) } }) .and_then(|s| { if multiline { response.push_str(&s); while !buffer.ends_with(".\r\n") { buffer.clear(); let read = self .client .read_line(&mut buffer) .map_err(|e| e.to_string()) .and_then(|x| { if x == 0 { Err("Connection aborted".to_string()) } else { Ok(x) } }) .map(|_| String::new()); if read.is_err() { return read; } log::trace!("Buffer content: {}", buffer); response.push_str(&buffer[.. buffer.len() - if buffer.ends_with(".\r\n") { 3 } else { 0 }]); } Ok(response) } else { Ok(s) } }) } #[cfg(feature = "with-rustls")] fn read_response(&mut self) -> Result<String> { let mut response = String::new(); let mut buffer = Vec::new(); while self.tls.wants_read() { let res = self .tls .read_tls(&mut self.client) .map_err(|e| e.to_string()) .and_then(|_| self.tls.process_new_packets().map_err(|e| e.to_string())) .and_then(|_| { self.tls .read_to_end(&mut buffer) .map_err(|e| e.to_string()) .and_then(|x| { if x == 0 { Err("Connection aborted".to_string()) } else { Ok(x) } }) .and_then(|_| String::from_utf8(buffer.clone()).map_err(|e| e.to_string())) }) .map(|s| response.push_str(&s)) .map(|_| buffer.clear()) .map(|_| String::new()); if res.is_err() { eprintln!("Err reading TLS: {}", response); return res; } } if response.starts_with("+OK") { Ok(response[4..].to_owned()) } else { Err(response[5..].to_owned()) } } #[cfg(not(feature = "with-rustls"))] fn send(&mut self, query: &str, multiline: bool) -> Result<String> { self.client .get_mut() .write_all(query.as_bytes()) .map_err(|e| e.to_string()) .and_then(|_| self.read_response(multiline)) .map_err(|e| { eprintln!("Error: {}", e); e }) } #[cfg(feature = "with-rustls")] fn send(&mut self, query: &str, _multiline: bool) -> Result<String> { self.tls .write_all(query.as_bytes()) .map_err(|e| e.to_string()) .and_then(|_| { let mut res = Ok(0); while self.tls.wants_write() { let write = self .tls .write_tls(&mut self.client.get_mut()) .map_err(|e| e.to_string()); res = res.and(write); } res }) .and_then(|_| self.read_response()) } }