798 lines
28 KiB
Rust
798 lines
28 KiB
Rust
/*
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* meli - imap module.
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*
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* Copyright 2017 - 2019 Manos Pitsidianakis
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*
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* This file is part of meli.
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*
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* meli is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* meli is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with meli. If not, see <http://www.gnu.org/licenses/>.
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*/
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use super::protocol_parser::{ImapLineSplit, ImapResponse, RequiredResponses};
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use crate::backends::MailboxHash;
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use crate::connections::Connection;
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use crate::email::parser::BytesExt;
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use crate::error::*;
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extern crate native_tls;
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use futures::io::{AsyncReadExt, AsyncWriteExt};
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use native_tls::TlsConnector;
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pub use smol::Async as AsyncWrapper;
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use std::collections::HashSet;
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use std::future::Future;
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use std::iter::FromIterator;
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use std::net::SocketAddr;
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use std::pin::Pin;
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use std::sync::Arc;
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use std::time::Instant;
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use super::protocol_parser;
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use super::{Capabilities, ImapServerConf, UIDStore};
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#[derive(Debug, Clone, Copy, PartialEq)]
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pub enum ImapProtocol {
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IMAP,
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ManageSieve,
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}
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#[derive(Debug)]
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pub struct ImapStream {
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cmd_id: usize,
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stream: AsyncWrapper<Connection>,
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protocol: ImapProtocol,
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}
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#[derive(Debug, Copy, Clone, Eq, PartialEq)]
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pub enum MailboxSelection {
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None,
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Select(MailboxHash),
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Examine(MailboxHash),
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}
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impl MailboxSelection {
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pub fn take(&mut self) -> Self {
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std::mem::replace(self, MailboxSelection::None)
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}
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}
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#[derive(Debug)]
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pub struct ImapConnection {
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pub stream: Result<ImapStream>,
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pub server_conf: ImapServerConf,
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pub capabilities: Capabilities,
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pub uid_store: Arc<UIDStore>,
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pub current_mailbox: MailboxSelection,
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}
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impl Drop for ImapStream {
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fn drop(&mut self) {
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//self.send_command(b"LOGOUT").ok().take();
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}
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}
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impl ImapStream {
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pub async fn new_connection(
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server_conf: &ImapServerConf,
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) -> Result<(Capabilities, ImapStream)> {
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use std::net::TcpStream;
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let path = &server_conf.server_hostname;
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debug!("ImapStream::new_connection");
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let cmd_id = 1;
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let stream = if debug!(server_conf.use_tls) {
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let mut connector = TlsConnector::builder();
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if server_conf.danger_accept_invalid_certs {
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connector.danger_accept_invalid_certs(true);
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}
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let connector = connector.build()?;
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let addr = if let Ok(a) = lookup_ipv4(path, server_conf.server_port) {
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a
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} else {
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return Err(MeliError::new(format!(
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"Could not lookup address {}",
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&path
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)));
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};
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debug!("addr {:?}", addr);
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let mut socket = AsyncWrapper::new(Connection::Tcp(debug!(
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TcpStream::connect_timeout(&addr, std::time::Duration::new(4, 0),)
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)?))?;
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if debug!(server_conf.use_starttls) {
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let mut buf = vec![0; 1024];
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match server_conf.protocol {
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ImapProtocol::IMAP => {
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socket
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.write_all(format!("M{} STARTTLS\r\n", cmd_id).as_bytes())
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.await?
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}
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ImapProtocol::ManageSieve => {
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let len = socket.read(&mut buf).await?;
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debug!(unsafe { std::str::from_utf8_unchecked(&buf[0..len]) });
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debug!(socket.write_all(b"STARTTLS\r\n").await?);
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}
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}
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let mut response = String::with_capacity(1024);
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let mut broken = false;
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let now = std::time::Instant::now();
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while now.elapsed().as_secs() < 3 {
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let len = socket.read(&mut buf).await?;
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response.push_str(unsafe { std::str::from_utf8_unchecked(&buf[0..len]) });
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match server_conf.protocol {
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ImapProtocol::IMAP => {
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if response.starts_with("* OK ") && response.find("\r\n").is_some() {
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if let Some(pos) = response.as_bytes().find(b"\r\n") {
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response.drain(0..pos + 2);
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}
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}
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}
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ImapProtocol::ManageSieve => {
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if response.starts_with("OK ") && response.find("\r\n").is_some() {
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response.clear();
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broken = true;
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break;
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}
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}
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}
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if response.starts_with("M1 OK") {
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broken = true;
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break;
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}
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}
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if !broken {
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return Err(MeliError::new(format!(
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"Could not initiate TLS negotiation to {}.",
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path
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)));
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}
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}
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{
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// FIXME: This is blocking
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let socket = socket.into_inner()?;
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let mut conn_result = connector.connect(path, socket);
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if let Err(native_tls::HandshakeError::WouldBlock(midhandshake_stream)) =
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conn_result
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{
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let mut midhandshake_stream = Some(midhandshake_stream);
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loop {
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match midhandshake_stream.take().unwrap().handshake() {
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Ok(r) => {
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conn_result = Ok(r);
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break;
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}
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Err(native_tls::HandshakeError::WouldBlock(stream)) => {
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midhandshake_stream = Some(stream);
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}
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p => {
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p?;
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}
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}
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}
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}
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AsyncWrapper::new(Connection::Tls(conn_result?))?
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}
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} else {
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let addr = if let Ok(a) = lookup_ipv4(path, server_conf.server_port) {
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a
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} else {
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return Err(MeliError::new(format!(
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"Could not lookup address {}",
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&path
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)));
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};
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AsyncWrapper::new(Connection::Tcp(TcpStream::connect_timeout(
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&addr,
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std::time::Duration::new(4, 0),
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)?))?
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};
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let mut res = String::with_capacity(8 * 1024);
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let mut ret = ImapStream {
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cmd_id,
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stream,
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protocol: server_conf.protocol,
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};
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if let ImapProtocol::ManageSieve = server_conf.protocol {
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use data_encoding::BASE64;
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ret.read_response(&mut res).await?;
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ret.send_command(
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format!(
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"AUTHENTICATE \"PLAIN\" \"{}\"",
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BASE64.encode(
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format!(
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"\0{}\0{}",
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&server_conf.server_username, &server_conf.server_password
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)
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.as_bytes()
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)
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)
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.as_bytes(),
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)
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.await?;
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ret.read_response(&mut res).await?;
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return Ok((Default::default(), ret));
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}
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ret.send_command(b"CAPABILITY").await?;
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ret.read_response(&mut res).await?;
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let capabilities: std::result::Result<Vec<&[u8]>, _> = res
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.split_rn()
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.find(|l| l.starts_with("* CAPABILITY"))
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.ok_or_else(|| MeliError::new(""))
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.and_then(|res| {
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protocol_parser::capabilities(res.as_bytes())
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.map_err(|_| MeliError::new(""))
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.map(|(_, v)| v)
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});
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if capabilities.is_err() {
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return Err(MeliError::new(format!(
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"Could not connect to {}: expected CAPABILITY response but got:{}",
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&server_conf.server_hostname, res
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)));
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}
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let capabilities = capabilities.unwrap();
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if !capabilities
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.iter()
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.any(|cap| cap.eq_ignore_ascii_case(b"IMAP4rev1"))
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{
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return Err(MeliError::new(format!(
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"Could not connect to {}: server is not IMAP4rev1 compliant",
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&server_conf.server_hostname
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)));
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} else if capabilities
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.iter()
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.any(|cap| cap.eq_ignore_ascii_case(b"LOGINDISABLED"))
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{
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return Err(MeliError::new(format!(
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"Could not connect to {}: server does not accept logins [LOGINDISABLED]",
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&server_conf.server_hostname
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)));
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}
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let mut capabilities = None;
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ret.send_command(
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format!(
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"LOGIN \"{}\" \"{}\"",
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&server_conf.server_username, &server_conf.server_password
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)
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.as_bytes(),
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)
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.await?;
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let tag_start = format!("M{} ", (ret.cmd_id - 1));
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loop {
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ret.read_lines(&mut res, &String::new(), false).await?;
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let mut should_break = false;
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for l in res.split_rn() {
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if l.starts_with("* CAPABILITY") {
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capabilities = protocol_parser::capabilities(l.as_bytes())
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.map(|(_, capabilities)| {
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HashSet::from_iter(capabilities.into_iter().map(|s: &[u8]| s.to_vec()))
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})
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.ok();
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}
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if l.starts_with(tag_start.as_str()) {
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if !l[tag_start.len()..].trim().starts_with("OK ") {
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return Err(MeliError::new(format!(
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"Could not connect. Server replied with '{}'",
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l[tag_start.len()..].trim()
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)));
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}
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should_break = true;
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}
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}
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if should_break {
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break;
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}
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}
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if capabilities.is_none() {
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/* sending CAPABILITY after LOGIN automatically is an RFC recommendation, so check
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* for lazy servers */
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drop(capabilities);
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ret.send_command(b"CAPABILITY").await?;
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ret.read_response(&mut res).await.unwrap();
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let capabilities = protocol_parser::capabilities(res.as_bytes())?.1;
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let capabilities = HashSet::from_iter(capabilities.into_iter().map(|s| s.to_vec()));
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Ok((capabilities, ret))
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} else {
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let capabilities = capabilities.unwrap();
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Ok((capabilities, ret))
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}
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}
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pub async fn read_response(&mut self, ret: &mut String) -> Result<()> {
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let id = match self.protocol {
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ImapProtocol::IMAP => format!("M{} ", self.cmd_id - 1),
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ImapProtocol::ManageSieve => String::new(),
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};
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self.read_lines(ret, &id, true).await?;
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Ok(())
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}
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pub async fn read_lines(
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&mut self,
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ret: &mut String,
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termination_string: &str,
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keep_termination_string: bool,
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) -> Result<()> {
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let mut buf: [u8; 1024] = [0; 1024];
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ret.clear();
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let mut last_line_idx: usize = 0;
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loop {
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match self.stream.read(&mut buf).await {
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Ok(0) => break,
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Ok(b) => {
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ret.push_str(unsafe { std::str::from_utf8_unchecked(&buf[0..b]) });
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if let Some(mut pos) = ret[last_line_idx..].rfind("\r\n") {
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if ret[last_line_idx..].starts_with("* BYE") {
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return Err(MeliError::new("Disconnected"));
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}
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if let Some(prev_line) =
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ret[last_line_idx..pos + last_line_idx].rfind("\r\n")
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{
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last_line_idx += prev_line + "\r\n".len();
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pos -= prev_line + "\r\n".len();
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}
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if Some(pos + "\r\n".len()) == ret.get(last_line_idx..).map(|r| r.len()) {
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if !termination_string.is_empty()
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&& ret[last_line_idx..].starts_with(termination_string)
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{
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debug!(&ret[last_line_idx..]);
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if !keep_termination_string {
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ret.replace_range(last_line_idx.., "");
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}
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break;
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} else if termination_string.is_empty() {
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break;
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}
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}
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last_line_idx += pos + "\r\n".len();
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}
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}
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Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => {
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continue;
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}
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Err(e) => {
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return Err(MeliError::from(e));
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}
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}
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}
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//debug!("returning IMAP response:\n{:?}", &ret);
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Ok(())
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}
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pub async fn wait_for_continuation_request(&mut self) -> Result<()> {
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let term = "+ ".to_string();
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let mut ret = String::new();
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self.read_lines(&mut ret, &term, false).await?;
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Ok(())
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}
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pub async fn send_command(&mut self, command: &[u8]) -> Result<()> {
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let command = command.trim();
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match self.protocol {
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ImapProtocol::IMAP => {
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self.stream.write_all(b"M").await?;
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self.stream
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.write_all(self.cmd_id.to_string().as_bytes())
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.await?;
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self.stream.write_all(b" ").await?;
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self.cmd_id += 1;
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}
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ImapProtocol::ManageSieve => {}
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}
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self.stream.write_all(command).await?;
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self.stream.write_all(b"\r\n").await?;
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match self.protocol {
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ImapProtocol::IMAP => {
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debug!("sent: M{} {}", self.cmd_id - 1, unsafe {
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std::str::from_utf8_unchecked(command)
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});
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}
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ImapProtocol::ManageSieve => {}
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}
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Ok(())
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}
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pub async fn send_literal(&mut self, data: &[u8]) -> Result<()> {
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self.stream.write_all(data).await?;
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self.stream.write_all(b"\r\n").await?;
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Ok(())
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}
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pub async fn send_raw(&mut self, raw: &[u8]) -> Result<()> {
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self.stream.write_all(raw).await?;
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self.stream.write_all(b"\r\n").await?;
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Ok(())
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}
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pub async fn set_nonblocking(&mut self, val: bool) -> Result<()> {
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//self.stream.set_nonblocking(val).await?;
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Ok(())
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}
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}
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impl ImapConnection {
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pub fn new_connection(
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server_conf: &ImapServerConf,
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uid_store: Arc<UIDStore>,
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) -> ImapConnection {
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ImapConnection {
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stream: Err(MeliError::new("Offline".to_string())),
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server_conf: server_conf.clone(),
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capabilities: Capabilities::default(),
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uid_store,
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current_mailbox: MailboxSelection::None,
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}
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}
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pub async fn connect(&mut self) -> Result<()> {
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if let (instant, ref mut status @ Ok(())) = *self.uid_store.is_online.lock().unwrap() {
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if Instant::now().duration_since(instant) >= std::time::Duration::new(60 * 30, 0) {
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*status = Err(MeliError::new("Connection timed out"));
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self.stream = Err(MeliError::new("Connection timed out"));
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}
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}
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if self.stream.is_ok() {
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self.uid_store.is_online.lock().unwrap().0 = Instant::now();
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return Ok(());
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}
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let new_stream = debug!(ImapStream::new_connection(&self.server_conf).await);
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if new_stream.is_err() {
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*self.uid_store.is_online.lock().unwrap() = (
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Instant::now(),
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Err(new_stream.as_ref().unwrap_err().clone()),
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);
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} else {
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*self.uid_store.is_online.lock().unwrap() = (Instant::now(), Ok(()));
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}
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let (capabilities, stream) = new_stream?;
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self.stream = Ok(stream);
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self.capabilities = capabilities;
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Ok(())
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}
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pub fn read_response<'a>(
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&'a mut self,
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ret: &'a mut String,
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required_responses: RequiredResponses,
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) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'a>> {
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Box::pin(async move {
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let mut response = String::new();
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ret.clear();
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self.stream.as_mut()?.read_response(&mut response).await?;
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match self.server_conf.protocol {
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ImapProtocol::IMAP => {
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let r: ImapResponse = ImapResponse::from(&response);
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match r {
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ImapResponse::Bye(ref response_code) => {
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self.stream = Err(MeliError::new(format!(
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"Offline: received BYE: {:?}",
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response_code
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)));
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ret.push_str(&response);
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}
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ImapResponse::No(ref response_code) => {
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debug!("Received NO response: {:?} {:?}", response_code, response);
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ret.push_str(&response);
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}
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ImapResponse::Bad(ref response_code) => {
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debug!("Received BAD response: {:?} {:?}", response_code, response);
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ret.push_str(&response);
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}
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_ => {
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/*debug!(
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"check every line for required_responses: {:#?}",
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&required_responses
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);*/
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for l in response.split_rn() {
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/*debug!("check line: {}", &l);*/
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if required_responses.check(l) || !self.process_untagged(l).await? {
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ret.push_str(l);
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}
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ret.push_str(l);
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}
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}
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}
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r.into()
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}
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ImapProtocol::ManageSieve => {
|
|
ret.push_str(&response);
|
|
Ok(())
|
|
}
|
|
}
|
|
})
|
|
}
|
|
|
|
pub async fn read_lines(&mut self, ret: &mut String, termination_string: String) -> Result<()> {
|
|
self.stream
|
|
.as_mut()?
|
|
.read_lines(ret, &termination_string, false)
|
|
.await?;
|
|
Ok(())
|
|
}
|
|
|
|
pub async fn wait_for_continuation_request(&mut self) -> Result<()> {
|
|
self.stream
|
|
.as_mut()?
|
|
.wait_for_continuation_request()
|
|
.await?;
|
|
Ok(())
|
|
}
|
|
|
|
pub async fn send_command(&mut self, command: &[u8]) -> Result<()> {
|
|
self.stream.as_mut()?.send_command(command).await?;
|
|
Ok(())
|
|
}
|
|
|
|
pub async fn send_literal(&mut self, data: &[u8]) -> Result<()> {
|
|
self.stream.as_mut()?.send_literal(data).await?;
|
|
Ok(())
|
|
}
|
|
|
|
pub async fn send_raw(&mut self, raw: &[u8]) -> Result<()> {
|
|
self.stream.as_mut()?.send_raw(raw).await?;
|
|
Ok(())
|
|
}
|
|
|
|
pub async fn set_nonblocking(&mut self, val: bool) -> Result<()> {
|
|
self.stream.as_mut()?.set_nonblocking(val).await?;
|
|
Ok(())
|
|
}
|
|
|
|
pub async fn select_mailbox(
|
|
&mut self,
|
|
mailbox_hash: MailboxHash,
|
|
ret: &mut String,
|
|
force: bool,
|
|
) -> Result<()> {
|
|
if !force && self.current_mailbox == MailboxSelection::Select(mailbox_hash) {
|
|
return Ok(());
|
|
}
|
|
self.send_command(
|
|
format!(
|
|
"SELECT \"{}\"",
|
|
self.uid_store.mailboxes.read().unwrap()[&mailbox_hash].imap_path()
|
|
)
|
|
.as_bytes(),
|
|
)
|
|
.await?;
|
|
self.read_response(ret, RequiredResponses::SELECT_REQUIRED)
|
|
.await?;
|
|
debug!("select response {}", ret);
|
|
self.current_mailbox = MailboxSelection::Select(mailbox_hash);
|
|
Ok(())
|
|
}
|
|
|
|
pub async fn examine_mailbox(
|
|
&mut self,
|
|
mailbox_hash: MailboxHash,
|
|
ret: &mut String,
|
|
force: bool,
|
|
) -> Result<()> {
|
|
if !force && self.current_mailbox == MailboxSelection::Examine(mailbox_hash) {
|
|
return Ok(());
|
|
}
|
|
self.send_command(
|
|
format!(
|
|
"EXAMINE \"{}\"",
|
|
self.uid_store.mailboxes.read().unwrap()[&mailbox_hash].imap_path()
|
|
)
|
|
.as_bytes(),
|
|
)
|
|
.await?;
|
|
self.read_response(ret, RequiredResponses::EXAMINE_REQUIRED)
|
|
.await?;
|
|
debug!("examine response {}", ret);
|
|
self.current_mailbox = MailboxSelection::Examine(mailbox_hash);
|
|
Ok(())
|
|
}
|
|
|
|
pub async fn unselect(&mut self) -> Result<()> {
|
|
match self.current_mailbox.take() {
|
|
MailboxSelection::Examine(mailbox_hash) |
|
|
MailboxSelection::Select(mailbox_hash) =>{
|
|
let mut response = String::with_capacity(8 * 1024);
|
|
if self
|
|
.capabilities
|
|
.iter()
|
|
.any(|cap| cap.eq_ignore_ascii_case(b"UNSELECT"))
|
|
{
|
|
self.send_command(b"UNSELECT").await?;
|
|
self.read_response(&mut response, RequiredResponses::empty())
|
|
.await?;
|
|
} else {
|
|
/* `RFC3691 - UNSELECT Command` states: "[..] IMAP4 provides this
|
|
* functionality (via a SELECT command with a nonexistent mailbox name or
|
|
* reselecting the same mailbox with EXAMINE command)[..]
|
|
*/
|
|
|
|
self.select_mailbox(mailbox_hash, &mut response, true).await?;
|
|
self.examine_mailbox(mailbox_hash, &mut response, true).await?;
|
|
}
|
|
},
|
|
MailboxSelection::None => {},
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn add_refresh_event(&mut self, ev: crate::backends::RefreshEvent) {
|
|
if let Some(ref sender) = self.uid_store.sender.read().unwrap().as_ref() {
|
|
sender.send(ev);
|
|
for ev in self.uid_store.refresh_events.lock().unwrap().drain(..) {
|
|
sender.send(ev);
|
|
}
|
|
} else {
|
|
self.uid_store.refresh_events.lock().unwrap().push(ev);
|
|
}
|
|
}
|
|
|
|
pub async fn create_uid_msn_cache(
|
|
&mut self,
|
|
mailbox_hash: MailboxHash,
|
|
low: usize,
|
|
) -> Result<()> {
|
|
debug_assert!(low > 0);
|
|
let mut response = String::new();
|
|
self.examine_mailbox(mailbox_hash, &mut response, false)
|
|
.await?;
|
|
self.send_command(format!("UID SEARCH {}:*", low).as_bytes())
|
|
.await?;
|
|
self.read_response(&mut response, RequiredResponses::SEARCH)
|
|
.await?;
|
|
debug!("uid search response {:?}", &response);
|
|
let mut msn_index_lck = self.uid_store.msn_index.lock().unwrap();
|
|
let msn_index = msn_index_lck.entry(mailbox_hash).or_default();
|
|
let _ = msn_index.drain(low - 1..);
|
|
msn_index.extend(
|
|
debug!(protocol_parser::search_results(response.as_bytes()))?
|
|
.1
|
|
.into_iter(),
|
|
);
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
pub struct ImapBlockingConnection {
|
|
buf: [u8; 1024],
|
|
result: Vec<u8>,
|
|
prev_res_length: usize,
|
|
pub conn: ImapConnection,
|
|
err: Option<String>,
|
|
}
|
|
|
|
impl From<ImapConnection> for ImapBlockingConnection {
|
|
fn from(_conn: ImapConnection) -> Self {
|
|
unimplemented!()
|
|
/*
|
|
conn.set_nonblocking(false)
|
|
.expect("set_nonblocking call failed");
|
|
conn.stream
|
|
.as_mut()
|
|
.map(|s| {
|
|
s.stream
|
|
.set_write_timeout(Some(std::time::Duration::new(30, 0)))
|
|
.expect("set_write_timeout call failed")
|
|
})
|
|
.expect("set_write_timeout call failed");
|
|
conn.stream
|
|
.as_mut()
|
|
.map(|s| {
|
|
s.stream
|
|
.set_read_timeout(Some(std::time::Duration::new(30, 0)))
|
|
.expect("set_read_timeout call failed")
|
|
})
|
|
.expect("set_read_timeout call failed");
|
|
ImapBlockingConnection {
|
|
buf: [0; 1024],
|
|
conn,
|
|
prev_res_length: 0,
|
|
result: Vec::with_capacity(8 * 1024),
|
|
err: None,
|
|
}
|
|
*/
|
|
}
|
|
}
|
|
|
|
impl ImapBlockingConnection {
|
|
pub fn into_conn(self) -> ImapConnection {
|
|
self.conn
|
|
}
|
|
|
|
pub fn err(&self) -> Option<&str> {
|
|
self.err.as_ref().map(String::as_str)
|
|
}
|
|
}
|
|
|
|
impl Iterator for ImapBlockingConnection {
|
|
type Item = Vec<u8>;
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
unimplemented!()
|
|
/*
|
|
|
|
self.result.drain(0..self.prev_res_length);
|
|
self.prev_res_length = 0;
|
|
let mut prev_failure = None;
|
|
let ImapBlockingConnection {
|
|
ref mut prev_res_length,
|
|
ref mut result,
|
|
ref mut conn,
|
|
ref mut buf,
|
|
ref mut err,
|
|
} = self;
|
|
loop {
|
|
if conn.stream.is_err() {
|
|
debug!(&conn.stream);
|
|
return None;
|
|
}
|
|
match conn.stream.as_mut().unwrap().stream.read(buf) {
|
|
Ok(0) => return None,
|
|
Ok(b) => {
|
|
result.extend_from_slice(&buf[0..b]);
|
|
debug!(unsafe { std::str::from_utf8_unchecked(result) });
|
|
if let Some(pos) = result.find(b"\r\n") {
|
|
*prev_res_length = pos + b"\r\n".len();
|
|
return Some(result[0..*prev_res_length].to_vec());
|
|
}
|
|
prev_failure = None;
|
|
}
|
|
Err(e)
|
|
if e.kind() == std::io::ErrorKind::WouldBlock
|
|
|| e.kind() == std::io::ErrorKind::Interrupted =>
|
|
{
|
|
debug!(&e);
|
|
if let Some(prev_failure) = prev_failure.as_ref() {
|
|
if Instant::now().duration_since(*prev_failure)
|
|
>= std::time::Duration::new(60 * 5, 0)
|
|
{
|
|
*err = Some(e.to_string());
|
|
return None;
|
|
}
|
|
} else {
|
|
prev_failure = Some(Instant::now());
|
|
}
|
|
continue;
|
|
}
|
|
Err(e) => {
|
|
debug!(&conn.stream);
|
|
debug!(&e);
|
|
*err = Some(e.to_string());
|
|
return None;
|
|
}
|
|
}
|
|
}
|
|
*/
|
|
}
|
|
}
|
|
|
|
fn lookup_ipv4(host: &str, port: u16) -> Result<SocketAddr> {
|
|
use std::net::ToSocketAddrs;
|
|
|
|
let addrs = (host, port).to_socket_addrs()?;
|
|
for addr in addrs {
|
|
if let SocketAddr::V4(_) = addr {
|
|
return Ok(addr);
|
|
}
|
|
}
|
|
|
|
Err(MeliError::new("Cannot lookup address"))
|
|
}
|