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Add outgoing WebSocket support, major re-factor

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This commit is contained in:
Travis Burtrum 2022-02-10 01:18:35 -05:00
parent 0b9b9098f0
commit cb5553fb4f
12 changed files with 406 additions and 250 deletions
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2
.gitignore vendored
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@ -5,3 +5,5 @@
**/out/
**/core.*
fuzz/target/
todo.txt
conflict/

44
Cargo.lock generated
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@ -394,9 +394,9 @@ checksum = "1aab8fc367588b89dcee83ab0fd66b72b50b72fa1904d7095045ace2b0c81c35"
[[package]]
name = "js-sys"
version = "0.3.55"
version = "0.3.56"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7cc9ffccd38c451a86bf13657df244e9c3f37493cce8e5e21e940963777acc84"
checksum = "a38fc24e30fd564ce974c02bf1d337caddff65be6cc4735a1f7eab22a7440f04"
dependencies = [
"wasm-bindgen",
]
@ -897,9 +897,9 @@ checksum = "6e63cff320ae2c57904679ba7cb63280a3dc4613885beafb148ee7bf9aa9042d"
[[package]]
name = "syn"
version = "1.0.85"
version = "1.0.86"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a684ac3dcd8913827e18cd09a68384ee66c1de24157e3c556c9ab16d85695fb7"
checksum = "8a65b3f4ffa0092e9887669db0eae07941f023991ab58ea44da8fe8e2d511c6b"
dependencies = [
"proc-macro2",
"quote",
@ -996,8 +996,12 @@ checksum = "e80b39df6afcc12cdf752398ade96a6b9e99c903dfdc36e53ad10b9c366bca72"
dependencies = [
"futures-util",
"log",
"rustls",
"rustls-native-certs",
"tokio",
"tokio-rustls",
"tungstenite",
"webpki",
]
[[package]]
@ -1099,10 +1103,12 @@ dependencies = [
"httparse",
"log",
"rand",
"rustls",
"sha-1",
"thiserror",
"url",
"utf-8",
"webpki",
]
[[package]]
@ -1170,15 +1176,15 @@ checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
[[package]]
name = "wasi"
version = "0.10.3+wasi-snapshot-preview1"
version = "0.10.2+wasi-snapshot-preview1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "46a2e384a3f170b0c7543787a91411175b71afd56ba4d3a0ae5678d4e2243c0e"
checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
[[package]]
name = "wasm-bindgen"
version = "0.2.78"
version = "0.2.79"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "632f73e236b219150ea279196e54e610f5dbafa5d61786303d4da54f84e47fce"
checksum = "25f1af7423d8588a3d840681122e72e6a24ddbcb3f0ec385cac0d12d24256c06"
dependencies = [
"cfg-if",
"wasm-bindgen-macro",
@ -1186,9 +1192,9 @@ dependencies = [
[[package]]
name = "wasm-bindgen-backend"
version = "0.2.78"
version = "0.2.79"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a317bf8f9fba2476b4b2c85ef4c4af8ff39c3c7f0cdfeed4f82c34a880aa837b"
checksum = "8b21c0df030f5a177f3cba22e9bc4322695ec43e7257d865302900290bcdedca"
dependencies = [
"bumpalo",
"lazy_static",
@ -1201,9 +1207,9 @@ dependencies = [
[[package]]
name = "wasm-bindgen-macro"
version = "0.2.78"
version = "0.2.79"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d56146e7c495528bf6587663bea13a8eb588d39b36b679d83972e1a2dbbdacf9"
checksum = "2f4203d69e40a52ee523b2529a773d5ffc1dc0071801c87b3d270b471b80ed01"
dependencies = [
"quote",
"wasm-bindgen-macro-support",
@ -1211,9 +1217,9 @@ dependencies = [
[[package]]
name = "wasm-bindgen-macro-support"
version = "0.2.78"
version = "0.2.79"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7803e0eea25835f8abdc585cd3021b3deb11543c6fe226dcd30b228857c5c5ab"
checksum = "bfa8a30d46208db204854cadbb5d4baf5fcf8071ba5bf48190c3e59937962ebc"
dependencies = [
"proc-macro2",
"quote",
@ -1224,15 +1230,15 @@ dependencies = [
[[package]]
name = "wasm-bindgen-shared"
version = "0.2.78"
version = "0.2.79"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0237232789cf037d5480773fe568aac745bfe2afbc11a863e97901780a6b47cc"
checksum = "3d958d035c4438e28c70e4321a2911302f10135ce78a9c7834c0cab4123d06a2"
[[package]]
name = "web-sys"
version = "0.3.55"
version = "0.3.56"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "38eb105f1c59d9eaa6b5cdc92b859d85b926e82cb2e0945cd0c9259faa6fe9fb"
checksum = "c060b319f29dd25724f09a2ba1418f142f539b2be99fbf4d2d5a8f7330afb8eb"
dependencies = [
"js-sys",
"wasm-bindgen",
@ -1311,11 +1317,13 @@ dependencies = [
"die",
"env_logger",
"futures",
"futures-util",
"lazy_static",
"log",
"quinn",
"rand",
"rustls",
"rustls-native-certs",
"rustls-pemfile",
"serde",
"serde_derive",

20
Cargo.toml
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@ -38,9 +38,11 @@ tokio-rustls = { version = "0.23", optional = true }
# outgoing deps
lazy_static = { version = "1.4", optional = true }
webpki-roots = { version = "0.22", optional = true }
trust-dns-resolver = { version = "0.20", optional = true }
#trust-dns-resolver = { version = "0.20", features = ["dns-over-rustls"], optional = true }
# todo: feature to swap between webpki-roots and rustls-native-certs
webpki-roots = { version = "0.22", optional = true }
rustls-native-certs = { version = "0.6", optional = true }
# quic deps
quinn = { version = "0.8", optional = true }
@ -50,20 +52,16 @@ rustls = { version = "0.20.2", optional = true }
rustls-pemfile = { version = "0.2.1", optional = true }
# websocket deps
tokio-tungstenite = { version = "0.16", optional = true }
#tokio-tungstenite = { version = "0.16", optional = true, features = ["rustls-tls-webpki-roots"] }
tokio-tungstenite = { version = "0.16", optional = true, features = ["rustls-tls-native-roots"] }
futures-util = { version = "0.3", default-features = false, features = ["async-await", "sink", "std"], optional = true }
[features]
default = ["incoming", "outgoing", "quic", "websocket", "logging"]
#default = ["incoming", "outgoing"]
#default = ["incoming", "quic"]
#default = ["outgoing", "quic"]
#default = ["quic"]
#default = ["outgoing"]
#default = ["incoming"]
incoming = ["tokio-rustls", "rustls-pemfile", "rustls"]
outgoing = ["tokio-rustls", "trust-dns-resolver", "webpki-roots", "lazy_static", "rustls"]
quic = ["quinn", "rustls-pemfile", "rustls", "webpki-roots"]
websocket = ["tokio-tungstenite", "tokio-rustls", "rustls-pemfile", "rustls"]
outgoing = ["tokio-rustls", "trust-dns-resolver", "rustls-native-certs", "lazy_static", "rustls"]
quic = ["quinn", "rustls-pemfile", "rustls", "rustls-native-certs"]
websocket = ["tokio-tungstenite", "futures-util", "tokio-rustls", "rustls-pemfile", "rustls", "rustls-native-certs"]
logging = ["rand", "env_logger"]
[package.metadata.cargo-all-features]

9
README.md
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@ -34,8 +34,7 @@ xmpp-proxy in outgoing mode will:
#### Configuration
* `mkdir /etc/xmpp-proxy/ && cp xmpp-proxy.toml /etc/xmpp-proxy/`
* edit `/etc/xmpp-proxy/xmpp-proxy.toml` as needed, file is annotated clearly with comments
* put your TLS key/cert in `/etc/xmpp-proxy/`, if your key has "RSA PRIVATE KEY" in it, change that to "PRIVATE KEY":
`sed -i 's/RSA PRIVATE KEY/PRIVATE KEY/' /etc/xmpp-proxy/le.key`
* put your TLS key/cert in `/etc/xmpp-proxy/`
* Example systemd unit is provided in xmpp-proxy.service and locks it down with bare minimum permissions. Need to
set the permissions correctly: `chown -Rv 'systemd-network:' /etc/xmpp-proxy/`
* start xmpp-proxy: `Usage: xmpp-proxy [/path/to/xmpp-proxy.toml (default /etc/xmpp-proxy/xmpp-proxy.toml]`
@ -53,7 +52,6 @@ use the provided `xmpp-proxy.toml` configuration as-is.
Edit `/etc/prosody/prosody.cfg.lua`, Add these to modules_enabled:
```
"net_proxy";
"secure_interfaces";
"s2s_outgoing_proxy";
```
Until prosody-modules is updated, use my new module [mod_s2s_outgoing_proxy.lua](https://www.moparisthebest.com/mod_s2s_outgoing_proxy.lua).
@ -68,13 +66,12 @@ interfaces = { "127.0.0.1" }
-- you can also remove all certificates from your config
s2s_require_encryption = false
s2s_secure_auth = false
c2s_require_encryption = false
allow_unencrypted_plain_auth = true
-- xmpp-proxy outgoing is listening on this port, make all outgoing s2s connections directly to here
s2s_outgoing_proxy = { "127.0.0.1", 15270 }
-- trust connections coming from these IPs
secure_interfaces = { "127.0.0.1", "::1" }
-- handle PROXY protocol on these ports
proxy_port_mappings = {
[15222] = "c2s",

117
src/in_out.rs Normal file
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@ -0,0 +1,117 @@
// Box<dyn AsyncWrite + Unpin + Send>, Box<dyn AsyncRead + Unpin + Send>
#[cfg(feature = "websocket")]
use crate::{from_ws, to_ws_new};
use crate::{slicesubsequence::SliceSubsequence, trace, StanzaFilter, StanzaRead::*, StanzaReader, StanzaWrite::*};
use anyhow::{bail, Result};
#[cfg(feature = "websocket")]
use futures_util::{
stream::{SplitSink, SplitStream},
SinkExt, TryStreamExt,
};
use tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt, BufReader};
#[cfg(feature = "websocket")]
use tokio_tungstenite::{tungstenite::Message::*, WebSocketStream};
#[cfg(feature = "websocket")]
type WsWr = SplitSink<WebSocketStream<tokio_rustls::TlsStream<tokio::net::TcpStream>>, tokio_tungstenite::tungstenite::Message>;
#[cfg(feature = "websocket")]
type WsRd = SplitStream<WebSocketStream<tokio_rustls::TlsStream<tokio::net::TcpStream>>>;
pub enum StanzaWrite {
AsyncWrite(Box<dyn AsyncWrite + Unpin + Send>),
#[cfg(feature = "websocket")]
WebSocketClientWrite(WsWr),
}
pub enum StanzaRead {
AsyncRead(StanzaReader<BufReader<Box<dyn AsyncRead + Unpin + Send>>>),
#[cfg(feature = "websocket")]
WebSocketRead(WsRd),
}
impl StanzaWrite {
pub fn new(wr: Box<dyn AsyncWrite + Unpin + Send>) -> Self {
AsyncWrite(wr)
}
pub async fn write_all<'a>(&'a mut self, is_c2s: bool, buf: &'a [u8], end_of_first_tag: usize, client_addr: &'a str) -> Result<()> {
match self {
AsyncWrite(wr) => Ok(wr.write_all(buf).await?),
#[cfg(feature = "websocket")]
WebSocketClientWrite(in_wr) => {
let mut buf = buf;
// ignore this
if buf.starts_with(b"<?xml ") {
// we might want to skip this if it's stand-alone, otherwise we want to skip it
buf = &buf[b"<?xml ".len()..];
if let Ok(idx) = buf.first_index_of(b"<") {
buf = &buf[idx..];
} else {
trace!("code: skipping '{}'", String::from_utf8(buf.to_vec())?);
return Ok(());
}
}
let stanza = to_ws_new(buf, end_of_first_tag, is_c2s)?;
trace!("{} (after ws conversion) '{}'", client_addr, stanza);
Ok(in_wr.feed(Text(stanza)).await?)
}
}
}
pub async fn flush(&mut self) -> Result<()> {
match self {
AsyncWrite(wr) => Ok(wr.flush().await?),
#[cfg(feature = "websocket")]
WebSocketClientWrite(ws) => Ok(ws.flush().await?),
}
}
}
impl StanzaRead {
pub fn new(rd: Box<dyn AsyncRead + Unpin + Send>) -> Self {
// we naively read 1 byte at a time, which buffering significantly speeds up
AsyncRead(StanzaReader(BufReader::with_capacity(crate::IN_BUFFER_SIZE, rd)))
}
pub async fn next<'a>(&'a mut self, filter: &'a mut StanzaFilter, client_addr: &'a str, wrt: &mut StanzaWrite) -> Result<Option<(&'a [u8], usize)>> {
match self {
AsyncRead(rd) => rd.next_eoft(filter).await,
#[cfg(feature = "websocket")]
WebSocketRead(rd) => {
loop {
if let Some(msg) = rd.try_next().await? {
match msg {
// actual XMPP stanzas
Text(stanza) => {
trace!("{} (before ws conversion) '{}'", client_addr, stanza);
let stanza = from_ws(stanza);
let stanza = stanza.as_bytes();
// todo: set up websocket connection so max size cannot be bigger than filter.buf.len()
let buf = &mut filter.buf[0..stanza.len()];
buf.copy_from_slice(stanza);
return Ok(Some((buf, 0))); // todo: 0 or None...
}
// websocket ping/pong
Ping(msg) => {
match wrt {
AsyncWrite(_) => bail!("programming error! should always send matching write pair into read, so websocket for websocket..."),
WebSocketClientWrite(ws) => {
ws.feed(Pong(msg)).await?;
ws.flush().await?;
}
}
continue;
}
// handle Close, just break from loop, hopefully client sent <close/> before
Close(cf) => bail!("websocket close: {:?}", cf),
_ => bail!("invalid websocket message: {}", msg), // Binary or Pong
}
} else {
bail!("websocket stream ended")
}
}
}
}
}
}

115
src/main.rs
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@ -13,7 +13,7 @@ use die::Die;
use serde_derive::Deserialize;
use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt, ReadHalf, WriteHalf};
use tokio::io::{AsyncWriteExt, ReadHalf, WriteHalf};
use tokio::net::TcpListener;
use tokio::task::JoinHandle;
@ -54,8 +54,10 @@ mod websocket;
#[cfg(feature = "websocket")]
use crate::websocket::*;
mod in_out;
pub use crate::in_out::*;
const IN_BUFFER_SIZE: usize = 8192;
const OUT_BUFFER_SIZE: usize = 8192;
// todo: split these out to outgoing module
@ -75,6 +77,16 @@ pub fn root_cert_store() -> rustls::RootCertStore {
root_cert_store
}
#[cfg(feature = "rustls-native-certs")]
pub fn root_cert_store() -> rustls::RootCertStore {
use rustls::RootCertStore;
let mut root_cert_store = RootCertStore::empty();
for cert in rustls_native_certs::load_native_certs().expect("could not load platform certs") {
root_cert_store.add(&rustls::Certificate(cert.0)).unwrap();
}
root_cert_store
}
#[derive(Deserialize)]
struct Config {
tls_key: String,
@ -143,52 +155,73 @@ impl Config {
}
}
async fn shuffle_rd_wr<R: AsyncRead + Unpin, W: AsyncWrite + Unpin>(in_rd: R, in_wr: W, config: CloneableConfig, local_addr: SocketAddr, client_addr: &mut Context<'_>) -> Result<()> {
async fn shuffle_rd_wr(in_rd: StanzaRead, in_wr: StanzaWrite, config: CloneableConfig, local_addr: SocketAddr, client_addr: &mut Context<'_>) -> Result<()> {
let filter = StanzaFilter::new(config.max_stanza_size_bytes);
shuffle_rd_wr_filter(in_rd, in_wr, config, local_addr, client_addr, filter).await
}
async fn shuffle_rd_wr_filter<R: AsyncRead + Unpin, W: AsyncWrite + Unpin>(
in_rd: R,
mut in_wr: W,
async fn shuffle_rd_wr_filter(
mut in_rd: StanzaRead,
mut in_wr: StanzaWrite,
config: CloneableConfig,
local_addr: SocketAddr,
client_addr: &mut Context<'_>,
in_filter: StanzaFilter,
mut in_filter: StanzaFilter,
) -> Result<()> {
// we naively read 1 byte at a time, which buffering significantly speeds up
let in_rd = tokio::io::BufReader::with_capacity(IN_BUFFER_SIZE, in_rd);
// now read to figure out client vs server
let (stream_open, is_c2s, mut in_rd, mut in_filter) = stream_preamble(StanzaReader(in_rd), client_addr, in_filter).await?;
let (stream_open, is_c2s) = stream_preamble(&mut in_rd, &mut in_wr, client_addr.log_from(), &mut in_filter).await?;
let (mut out_rd, mut out_wr) = open_incoming(config, local_addr, client_addr, &stream_open, is_c2s, &mut in_filter).await?;
let (out_rd, out_wr) = open_incoming(&config, local_addr, client_addr, &stream_open, is_c2s, &mut in_filter).await?;
drop(stream_open);
let mut out_buf = [0u8; OUT_BUFFER_SIZE];
shuffle_rd_wr_filter_only(
in_rd,
in_wr,
StanzaRead::new(Box::new(out_rd)),
StanzaWrite::new(Box::new(out_wr)),
is_c2s,
config.max_stanza_size_bytes,
client_addr,
in_filter,
)
.await
}
#[allow(clippy::too_many_arguments)]
async fn shuffle_rd_wr_filter_only(
mut in_rd: StanzaRead,
mut in_wr: StanzaWrite,
mut out_rd: StanzaRead,
mut out_wr: StanzaWrite,
is_c2s: bool,
max_stanza_size_bytes: usize,
client_addr: &mut Context<'_>,
mut in_filter: StanzaFilter,
) -> Result<()> {
let mut out_filter = StanzaFilter::new(max_stanza_size_bytes);
loop {
tokio::select! {
Ok(buf) = in_rd.next(&mut in_filter) => {
match buf {
None => break,
Some(buf) => {
trace!("{} '{}'", client_addr.log_from(), to_str(buf));
out_wr.write_all(buf).await?;
out_wr.flush().await?;
Ok(ret) = in_rd.next(&mut in_filter, client_addr.log_to(), &mut in_wr) => {
match ret {
None => break,
Some((buf, eoft)) => {
trace!("{} '{}'", client_addr.log_from(), to_str(buf));
out_wr.write_all(is_c2s, buf, eoft, client_addr.log_from()).await?;
out_wr.flush().await?;
}
}
}
},
// we could filter outgoing from-server stanzas by size here too by doing same as above
// but instead, we'll just send whatever the server sends as it sends it...
Ok(n) = out_rd.read(&mut out_buf) => {
if n == 0 {
break;
}
trace!("{} '{}'", client_addr.log_to(), to_str(&out_buf[0..n]));
in_wr.write_all(&out_buf[0..n]).await?;
in_wr.flush().await?;
},
},
Ok(ret) = out_rd.next(&mut out_filter, client_addr.log_from(), &mut out_wr) => {
match ret {
None => break,
Some((buf, eoft)) => {
trace!("{} '{}'", client_addr.log_to(), to_str(buf));
in_wr.write_all(is_c2s, buf, eoft, client_addr.log_to()).await?;
in_wr.flush().await?;
}
}
},
}
}
@ -197,7 +230,7 @@ async fn shuffle_rd_wr_filter<R: AsyncRead + Unpin, W: AsyncWrite + Unpin>(
}
async fn open_incoming(
config: CloneableConfig,
config: &CloneableConfig,
local_addr: SocketAddr,
client_addr: &mut Context<'_>,
stream_open: &[u8],
@ -239,25 +272,20 @@ async fn open_incoming(
Ok((out_rd, out_wr))
}
async fn stream_preamble<R: AsyncRead + Unpin>(mut in_rd: StanzaReader<R>, client_addr: &Context<'_>, mut in_filter: StanzaFilter) -> Result<(Vec<u8>, bool, StanzaReader<R>, StanzaFilter)> {
pub async fn stream_preamble(in_rd: &mut StanzaRead, in_wr: &mut StanzaWrite, client_addr: &'_ str, in_filter: &mut StanzaFilter) -> Result<(Vec<u8>, bool)> {
let mut stream_open = Vec::new();
while let Ok(Some(buf)) = in_rd.next(&mut in_filter).await {
trace!("{} received pre-<stream:stream> stanza: '{}'", client_addr.log_from(), to_str(buf));
while let Ok(Some((buf, _))) = in_rd.next(in_filter, client_addr, in_wr).await {
trace!("{} received pre-<stream:stream> stanza: '{}'", client_addr, to_str(buf));
if buf.starts_with(b"<?xml ") {
stream_open.extend_from_slice(buf);
} else if buf.starts_with(b"<stream:stream ") {
stream_open.extend_from_slice(buf);
return Ok((
stream_open,
buf.contains_seq(br#" xmlns="jabber:client""#) || buf.contains_seq(br#" xmlns='jabber:client'"#),
in_rd,
in_filter,
));
return Ok((stream_open, buf.contains_seq(br#" xmlns="jabber:client""#) || buf.contains_seq(br#" xmlns='jabber:client'"#)));
} else {
bail!("bad pre-<stream:stream> stanza: {}", to_str(buf));
}
}
bail!("stream ended before open");
bail!("stream ended before open")
}
#[tokio::main]
@ -277,6 +305,7 @@ async fn main() {
if let Some(ref log_style) = main_config.log_style {
builder.parse_write_style(log_style);
}
// todo: config for this: builder.format_timestamp(None);
builder.init();
}

46
src/outgoing.rs
View File

@ -3,57 +3,27 @@ use crate::*;
async fn handle_outgoing_connection(stream: tokio::net::TcpStream, client_addr: &mut Context<'_>, max_stanza_size_bytes: usize) -> Result<()> {
info!("{} connected", client_addr.log_from());
let in_filter = StanzaFilter::new(max_stanza_size_bytes);
let mut in_filter = StanzaFilter::new(max_stanza_size_bytes);
let (in_rd, mut in_wr) = tokio::io::split(stream);
let (in_rd, in_wr) = tokio::io::split(stream);
// we naively read 1 byte at a time, which buffering significantly speeds up
//let in_rd = tokio::io::BufReader::with_capacity(IN_BUFFER_SIZE, in_rd);
let mut in_rd = StanzaRead::new(Box::new(in_rd));
let mut in_wr = StanzaWrite::new(Box::new(in_wr));
// now read to figure out client vs server
let (stream_open, is_c2s, in_rd, mut in_filter) = stream_preamble(StanzaReader(in_rd), client_addr, in_filter).await?;
let (stream_open, is_c2s) = stream_preamble(&mut in_rd, &mut in_wr, client_addr.log_to(), &mut in_filter).await?;
client_addr.set_c2s_stream_open(is_c2s, &stream_open);
// pull raw reader back out of StanzaReader
let mut in_rd = in_rd.0;
// we require a valid to= here or we fail
let to = std::str::from_utf8(stream_open.extract_between(b" to='", b"'").or_else(|_| stream_open.extract_between(b" to=\"", b"\""))?)?;
let (mut out_wr, mut out_rd, stream_open) = srv_connect(to, is_c2s, &stream_open, &mut in_filter, client_addr).await?;
let (out_wr, out_rd, stream_open) = srv_connect(to, is_c2s, &stream_open, &mut in_filter, client_addr).await?;
// send server response to client
in_wr.write_all(&stream_open).await?;
in_wr.write_all(is_c2s, &stream_open, 0, client_addr.log_from()).await?;
in_wr.flush().await?;
drop(stream_open);
let mut out_buf = [0u8; OUT_BUFFER_SIZE];
loop {
tokio::select! {
Ok(buf) = out_rd.next(&mut in_filter) => {
match buf {
None => break,
Some(buf) => {
trace!("{} '{}'", client_addr.log_to(), to_str(buf));
in_wr.write_all(buf).await?;
in_wr.flush().await?;
}
}
},
// we could filter outgoing from-client stanzas by size here too by doing same as above
// but instead, we'll just send whatever the client sends as it sends it...
Ok(n) = in_rd.read(&mut out_buf) => {
if n == 0 {
break;
}
trace!("{} '{}'", client_addr.log_from(), to_str(&out_buf[0..n]));
out_wr.write_all(&out_buf[0..n]).await?;
out_wr.flush().await?;
},
}
}
info!("{} disconnected", client_addr.log_from());
Ok(())
shuffle_rd_wr_filter_only(in_rd, in_wr, out_rd, out_wr, is_c2s, max_stanza_size_bytes, client_addr, in_filter).await
}
pub fn spawn_outgoing_listener(local_addr: SocketAddr, max_stanza_size_bytes: usize) -> JoinHandle<Result<()>> {

6
src/quic.rs
View File

@ -7,7 +7,7 @@ use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
use anyhow::Result;
pub async fn quic_connect(target: SocketAddr, server_name: &str, is_c2s: bool) -> Result<(Box<dyn AsyncWrite + Unpin + Send>, Box<dyn AsyncRead + Unpin + Send>)> {
pub async fn quic_connect(target: SocketAddr, server_name: &str, is_c2s: bool) -> Result<(StanzaWrite, StanzaRead)> {
let bind_addr = "0.0.0.0:0".parse().unwrap();
let mut client_cfg = ClientConfig::builder().with_safe_defaults().with_root_certificates(root_cert_store()).with_no_client_auth(); // todo: for s2s do client auth
client_cfg.alpn_protocols.push(if is_c2s { ALPN_XMPP_CLIENT } else { ALPN_XMPP_SERVER }.to_vec());
@ -20,7 +20,7 @@ pub async fn quic_connect(target: SocketAddr, server_name: &str, is_c2s: bool) -
trace!("quic connected: addr={}", connection.remote_address());
let (wrt, rd) = connection.open_bi().await?;
Ok((Box::new(wrt), Box::new(rd)))
Ok((StanzaWrite::AsyncWrite(Box::new(wrt)), StanzaRead::new(Box::new(rd))))
}
impl Config {
@ -80,7 +80,7 @@ pub fn spawn_quic_listener(local_addr: SocketAddr, config: CloneableConfig, serv
let mut client_addr = client_addr.clone();
info!("{} connected new stream", client_addr.log_from());
tokio::spawn(async move {
if let Err(e) = shuffle_rd_wr(rd, wrt, config, local_addr, &mut client_addr).await {
if let Err(e) = shuffle_rd_wr(StanzaRead::new(Box::new(rd)), StanzaWrite::new(Box::new(wrt)), config, local_addr, &mut client_addr).await {
error!("{} {}", client_addr.log_from(), e);
}
});

148
src/srv.rs
View File

@ -1,14 +1,15 @@
#![allow(clippy::upper_case_acronyms)]
use std::convert::TryFrom;
use std::net::SocketAddr;
use trust_dns_resolver::error::ResolveError;
use trust_dns_resolver::lookup::SrvLookup;
use trust_dns_resolver::lookup::{SrvLookup, TxtLookup};
use trust_dns_resolver::{IntoName, TokioAsyncResolver};
use anyhow::{bail, Result};
use tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt};
#[cfg(feature = "websocket")]
use tokio_tungstenite::tungstenite::http::Uri;
use crate::*;
@ -22,12 +23,14 @@ fn make_resolver() -> TokioAsyncResolver {
TokioAsyncResolver::tokio(config, options).unwrap()
}
#[derive(Copy, Clone, Debug)]
#[derive(Clone, Debug, PartialEq)]
pub enum XmppConnectionType {
StartTLS,
DirectTLS,
#[cfg(feature = "quic")]
QUIC,
#[cfg(feature = "websocket")]
WebSocket(Uri, String),
}
#[derive(Debug)]
@ -48,13 +51,14 @@ impl XmppConnection {
stream_open: &[u8],
in_filter: &mut crate::StanzaFilter,
client_addr: &mut Context<'_>,
) -> Result<(Box<dyn AsyncWrite + Unpin + Send>, Box<dyn AsyncRead + Unpin + Send>, SocketAddr, &'static str)> {
) -> Result<(StanzaWrite, StanzaRead, SocketAddr, &'static str)> {
debug!("{} attempting connection to SRV: {:?}", client_addr.log_from(), self);
// todo: need to set options to Ipv4AndIpv6
let ips = RESOLVER.lookup_ip(self.target.clone()).await?;
for ip in ips.iter() {
let to_addr = SocketAddr::new(ip, self.port);
debug!("{} trying ip {}", client_addr.log_from(), to_addr);
// todo: for DNSSEC we need to optionally allow target in addition to domain, but what for SNI
match self.conn_type {
XmppConnectionType::StartTLS => match crate::starttls_connect(to_addr, domain, is_c2s, stream_open, in_filter).await {
Ok((wr, rd)) => return Ok((wr, rd, to_addr, "starttls-out")),
@ -69,6 +73,12 @@ impl XmppConnection {
Ok((wr, rd)) => return Ok((wr, rd, to_addr, "quic-out")),
Err(e) => error!("quic connection failed to IP {} from SRV {}, error: {}", to_addr, self.target, e),
},
#[cfg(feature = "websocket")]
// todo: when websocket is found via DNS, we need to validate cert against domain, *not* target, this is a security problem with XEP-0156, we are doing it the secure but likely unexpected way here for now
XmppConnectionType::WebSocket(ref url, ref origin) => match crate::websocket_connect(to_addr, domain, url, origin, is_c2s).await {
Ok((wr, rd)) => return Ok((wr, rd, to_addr, "websocket-out")),
Err(e) => error!("websocket connection failed to IP {} from TXT {}, error: {}", to_addr, url, e),
},
}
}
bail!("cannot connect to any IPs for SRV: {}", self.target)
@ -80,7 +90,7 @@ fn collect_srvs(ret: &mut Vec<XmppConnection>, srv_records: std::result::Result<
for srv in srv_records.iter() {
if !srv.target().is_root() {
ret.push(XmppConnection {
conn_type,
conn_type: conn_type.clone(),
priority: srv.priority(),
weight: srv.weight(),
port: srv.port(),
@ -91,25 +101,92 @@ fn collect_srvs(ret: &mut Vec<XmppConnection>, srv_records: std::result::Result<
}
}
#[cfg(feature = "websocket")]
fn collect_txts(ret: &mut Vec<XmppConnection>, txt_records: std::result::Result<TxtLookup, ResolveError>, is_c2s: bool) {
if let Ok(txt_records) = txt_records {
for txt in txt_records.iter() {
for txt in txt.iter() {
// we only support wss and not ws (insecure) on purpose
if txt.starts_with(if is_c2s { b"_xmpp-client-websocket=wss://" } else { b"_xmpp-server-websocket=wss://" }) {
// 23 is the length of "_xmpp-client-websocket=" and "_xmpp-server-websocket="
let url = &txt[23..];
let url = match Uri::try_from(url) {
Ok(url) => url,
Err(e) => {
debug!("invalid TXT record '{}', {}", to_str(txt), e);
continue;
}
};
let server_name = match url.host() {
Some(server_name) => server_name.to_string(),
None => {
debug!("invalid TXT record '{}'", to_str(txt));
continue;
}
};
let target = server_name.clone().to_string();
let mut origin = "https://".to_string();
origin.push_str(&server_name);
let port = if let Some(port) = url.port() {
origin.push(':');
origin.push_str(port.as_str());
port.as_u16()
} else {
443
};
ret.push(XmppConnection {
conn_type: XmppConnectionType::WebSocket(url, origin),
priority: u16::MAX,
weight: 0,
port,
target,
});
}
}
}
}
}
pub async fn get_xmpp_connections(domain: &str, is_c2s: bool) -> Result<Vec<XmppConnection>> {
let (starttls, direct_tls, quic) = if is_c2s {
("_xmpp-client._tcp", "_xmpps-client._tcp", "_xmppq-client._udp")
let (starttls, direct_tls, quic, websocket) = if is_c2s {
("_xmpp-client._tcp", "_xmpps-client._tcp", "_xmppq-client._udp", "_xmppconnect")
} else {
("_xmpp-server._tcp", "_xmpps-server._tcp", "_xmppq-server._udp")
("_xmpp-server._tcp", "_xmpps-server._tcp", "_xmppq-server._udp", "_xmppconnect-server")
};
let starttls = format!("{}.{}.", starttls, domain).into_name()?;
let direct_tls = format!("{}.{}.", direct_tls, domain).into_name()?;
#[cfg(feature = "quic")]
let quic = format!("{}.{}.", quic, domain).into_name()?;
#[cfg(feature = "websocket")]
let websocket = format!("{}.{}.", websocket, domain).into_name()?;
// this lets them run concurrently but not in parallel, could spawn parallel tasks but... worth it ?
let (starttls, direct_tls, quic) = tokio::join!(RESOLVER.srv_lookup(starttls), RESOLVER.srv_lookup(direct_tls), RESOLVER.srv_lookup(quic),);
// todo: don't look up websocket or quic records when they are disabled
let (
starttls,
direct_tls,
//#[cfg(feature = "quic")]
quic,
//#[cfg(feature = "websocket")]
websocket,
) = tokio::join!(
RESOLVER.srv_lookup(starttls),
RESOLVER.srv_lookup(direct_tls),
//#[cfg(feature = "quic")]
RESOLVER.srv_lookup(quic),
//#[cfg(feature = "websocket")]
RESOLVER.txt_lookup(websocket),
);
let mut ret = Vec::new();
collect_srvs(&mut ret, starttls, XmppConnectionType::StartTLS);
collect_srvs(&mut ret, direct_tls, XmppConnectionType::DirectTLS);
#[cfg(feature = "quic")]
collect_srvs(&mut ret, quic, XmppConnectionType::QUIC);
#[cfg(feature = "websocket")]
collect_txts(&mut ret, websocket, is_c2s);
ret.sort_by(|a, b| a.priority.cmp(&b.priority));
// todo: do something with weight
@ -157,54 +234,30 @@ pub async fn get_xmpp_connections(domain: &str, is_c2s: bool) -> Result<Vec<Xmpp
Ok(ret)
}
pub async fn srv_connect(
domain: &str,
is_c2s: bool,
stream_open: &[u8],
in_filter: &mut crate::StanzaFilter,
client_addr: &mut Context<'_>,
) -> Result<(Box<dyn AsyncWrite + Unpin + Send>, StanzaReader<tokio::io::BufReader<Box<dyn AsyncRead + Unpin + Send>>>, Vec<u8>)> {
pub async fn srv_connect(domain: &str, is_c2s: bool, stream_open: &[u8], in_filter: &mut crate::StanzaFilter, client_addr: &mut Context<'_>) -> Result<(StanzaWrite, StanzaRead, Vec<u8>)> {
for srv in get_xmpp_connections(domain, is_c2s).await? {
let connect = srv.connect(domain, is_c2s, stream_open, in_filter, client_addr).await;
if connect.is_err() {
continue;
}
let (mut out_wr, out_rd, to_addr, proto) = connect.unwrap();
let (mut out_wr, mut out_rd, to_addr, proto) = connect.unwrap();
// if any of these ? returns early with an Err, these will stay set, I think that's ok though, the connection will be closed
client_addr.set_proto(proto);
client_addr.set_to_addr(to_addr);
debug!("{} connected", client_addr.log_from());
// we naively read 1 byte at a time, which buffering significantly speeds up
let mut out_rd = StanzaReader(tokio::io::BufReader::with_capacity(crate::IN_BUFFER_SIZE, out_rd));
trace!("{} '{}'", client_addr.log_from(), to_str(stream_open));
out_wr.write_all(stream_open).await?;
out_wr.write_all(is_c2s, stream_open, stream_open.len(), client_addr.log_from()).await?;
out_wr.flush().await?;
let mut server_response = Vec::new();
// let's read to first <stream:stream to make sure we are successfully connected to a real XMPP server
let mut stream_received = false;
while let Ok(Some(buf)) = out_rd.next(in_filter).await {
trace!("{} received pre-tls stanza: '{}'", client_addr.log_to(), to_str(buf));
if buf.starts_with(b"<?xml ") {
server_response.extend_from_slice(buf);
} else if buf.starts_with(b"<stream:stream ") {
server_response.extend_from_slice(buf);
stream_received = true;
break;
} else {
trace!("{} bad pre-tls stanza: {}", client_addr.log_to(), to_str(buf));
break;
match stream_preamble(&mut out_rd, &mut out_wr, client_addr.log_to(), in_filter).await {
Ok((server_response, _)) => return Ok((out_wr, out_rd, server_response)),
Err(e) => {
debug!("{} bad server response, going to next record, error: {}", client_addr.log_to(), e);
client_addr.set_proto("unk-out");
continue;
}
}
if !stream_received {
debug!("{} bad server response, going to next record", client_addr.log_to());
client_addr.set_proto("unk-out");
continue;
}
return Ok((Box::new(out_wr), out_rd, server_response));
}
bail!("all connection attempts failed")
}
@ -212,13 +265,18 @@ pub async fn srv_connect(
#[cfg(test)]
mod tests {
use crate::srv::*;
#[tokio::test]
async fn srv() -> Result<()> {
let domain = "moparisthebest.com";
let domain = "burtrum.org";
let is_c2s = true;
for srv in get_xmpp_connections(domain, is_c2s).await? {
let ips = RESOLVER.lookup_ip(srv.target.clone()).await?;
println!("trying 1 domain {}, SRV: {:?}", domain, srv);
#[cfg(feature = "websocket")]
if srv.conn_type == XmppConnectionType::WebSocket {
continue;
}
let ips = RESOLVER.lookup_ip(srv.target.clone()).await?;
for ip in ips.iter() {
println!("trying domain {}, ip {}, is_c2s: {}, SRV: {:?}", domain, ip, is_c2s, srv);
}

1
src/stanzafilter.rs
View File

@ -214,7 +214,6 @@ impl<T: tokio::io::AsyncRead + Unpin> StanzaReader<T> {
}
}
#[cfg(feature = "websocket")]
pub async fn next_eoft<'a>(&'a mut self, filter: &'a mut StanzaFilter) -> Result<Option<(&'a [u8], usize)>> {
use tokio::io::AsyncReadExt;

16
src/tls.rs
View File

@ -28,7 +28,7 @@ lazy_static::lazy_static! {
}
#[cfg(feature = "outgoing")]
pub async fn tls_connect(target: SocketAddr, server_name: &str, is_c2s: bool) -> Result<(Box<dyn AsyncWrite + Unpin + Send>, Box<dyn AsyncRead + Unpin + Send>)> {
pub async fn tls_connect(target: SocketAddr, server_name: &str, is_c2s: bool) -> Result<(StanzaWrite, StanzaRead)> {
let dnsname = ServerName::try_from(server_name)?;
let stream = tokio::net::TcpStream::connect(target).await?;
let stream = if is_c2s {
@ -37,17 +37,11 @@ pub async fn tls_connect(target: SocketAddr, server_name: &str, is_c2s: bool) ->
SERVER_TLS_CONFIG.connect(dnsname, stream).await?
};
let (rd, wrt) = tokio::io::split(stream);
Ok((Box::new(wrt), Box::new(rd)))
Ok((StanzaWrite::AsyncWrite(Box::new(wrt)), StanzaRead::new(Box::new(rd))))
}
#[cfg(feature = "outgoing")]
pub async fn starttls_connect(
target: SocketAddr,
server_name: &str,
is_c2s: bool,
stream_open: &[u8],
in_filter: &mut StanzaFilter,
) -> Result<(Box<dyn AsyncWrite + Unpin + Send>, Box<dyn AsyncRead + Unpin + Send>)> {
pub async fn starttls_connect(target: SocketAddr, server_name: &str, is_c2s: bool, stream_open: &[u8], in_filter: &mut StanzaFilter) -> Result<(StanzaWrite, StanzaRead)> {
let dnsname = ServerName::try_from(server_name)?;
let mut stream = tokio::net::TcpStream::connect(target).await?;
let (in_rd, mut in_wr) = stream.split();
@ -91,7 +85,7 @@ pub async fn starttls_connect(
SERVER_TLS_CONFIG.connect(dnsname, stream).await?
};
let (rd, wrt) = tokio::io::split(stream);
Ok((Box::new(wrt), Box::new(rd)))
Ok((StanzaWrite::AsyncWrite(Box::new(wrt)), StanzaRead::new(Box::new(rd))))
}
#[cfg(feature = "incoming")]
@ -213,5 +207,5 @@ async fn handle_tls_connection(mut stream: tokio::net::TcpStream, client_addr: &
let (in_rd, in_wr) = tokio::io::split(stream);
shuffle_rd_wr_filter(in_rd, in_wr, config, local_addr, client_addr, in_filter).await
shuffle_rd_wr_filter(StanzaRead::new(Box::new(in_rd)), StanzaWrite::new(Box::new(in_wr)), config, local_addr, client_addr, in_filter).await
}

132
src/websocket.rs
View File

@ -1,7 +1,7 @@
use crate::*;
use futures::{SinkExt, StreamExt, TryStreamExt};
use anyhow::Result;
use futures::StreamExt;
use tokio_tungstenite::tungstenite::protocol::Message::*;
use tokio_tungstenite::tungstenite::protocol::WebSocketConfig;
// https://datatracker.ietf.org/doc/html/rfc7395
@ -31,7 +31,10 @@ async fn handle_websocket_connection(stream: tokio::net::TcpStream, client_addr:
// start TLS
let stream = acceptor.accept(stream).await?;
let stream: tokio_rustls::TlsStream<tokio::net::TcpStream> = stream.into();
// accept the websocket
// todo: check SEC_WEBSOCKET_PROTOCOL or ORIGIN ?
let stream = tokio_tungstenite::accept_async_with_config(
stream,
Some(WebSocketConfig {
@ -43,86 +46,31 @@ async fn handle_websocket_connection(stream: tokio::net::TcpStream, client_addr:
)
.await?;
let (mut in_wr, mut in_rd) = stream.split();
let (in_wr, in_rd) = stream.split();
// https://docs.rs/tungstenite/0.14.0/tungstenite/protocol/enum.Message.html
// https://datatracker.ietf.org/doc/html/rfc7395#section-3.2 Data frame messages in the XMPP subprotocol MUST be of the text type and contain UTF-8 encoded data.
let (stanza, is_c2s) = match in_rd.try_next().await? {
// todo: c2s is xmlns="urn:ietf:params:xml:ns:xmpp-framing", let's make up s2s ? xmlns="urn:ietf:params:xml:ns:xmpp-framing-server" sounds good to me
Some(Text(stanza)) => {
let is_c2s = stanza.contains(r#" xmlns="urn:ietf:params:xml:ns:xmpp-framing""#) || stanza.contains(r#" xmlns='urn:ietf:params:xml:ns:xmpp-framing'"#);
(stanza, is_c2s)
}
_ => bail!("expected first websocket frame to be open"),
};
let in_filter = StanzaFilter::new(config.max_stanza_size_bytes);
let stanza = from_ws(stanza);
let stream_open = stanza.as_bytes();
// websocket frame size filters incoming stanza size from client, this is used to split the
// stanzas from the servers up so we can send them across websocket frames
let mut in_filter = StanzaFilter::new(config.max_stanza_size_bytes);
let (out_rd, mut out_wr) = open_incoming(config, local_addr, client_addr, stream_open, is_c2s, &mut in_filter).await?;
let mut out_rd = StanzaReader(out_rd);
loop {
tokio::select! {
// server to client
Ok(buf) = out_rd.next_eoft(&mut in_filter) => {
match buf {
None => break,
Some((buf, end_of_first_tag)) => {
// ignore this
if buf.starts_with(b"<?xml ") {
continue;
}
let stanza = to_ws_new(buf, end_of_first_tag, is_c2s)?;
trace!("{} '{}'", client_addr.log_to(), stanza);
in_wr.feed(Text(stanza)).await?;
in_wr.flush().await?;
}
}
},
Ok(Some(msg)) = in_rd.try_next() => {
match msg {
// actual XMPP stanzas
Text(stanza) => {
let stanza = from_ws(stanza);
trace!("{} '{}'", client_addr.log_from(), stanza);
out_wr.write_all(stanza.as_bytes()).await?;
out_wr.flush().await?;
}
// websocket ping/pong
Ping(msg) => {
in_wr.feed(Pong(msg)).await?;
in_wr.flush().await?;
},
// handle Close, just break from loop, hopefully client sent <close/> before
Close(_) => break,
_ => bail!("invalid websocket message: {}", msg) // Binary or Pong
}
},
// todo: should we also send pings to the client ourselves on a schedule? StanzaFilter strips out whitespace pings if the server uses them...
}
}
info!("{} disconnected", client_addr.log_from());
Ok(())
shuffle_rd_wr_filter(StanzaRead::WebSocketRead(in_rd), StanzaWrite::WebSocketClientWrite(in_wr), config, local_addr, client_addr, in_filter).await
}
pub fn from_ws(stanza: String) -> String {
if stanza.starts_with("<open ") {
return stanza
.replace("<open ", r#"<?xml version='1.0'?><stream:stream xmlns:stream="http://etherx.jabber.org/streams" "#)
let stanza = stanza
// todo: hmm what to do here, xml needed? breaks srv pre-tls detection because it's really 2 "stanzas"....
//.replace("<open ", r#"<?xml version='1.0'?><stream:stream "#)
.replace("<open ", r#"<stream:stream "#)
.replace("urn:ietf:params:xml:ns:xmpp-framing-server", "jabber:server")
.replace("urn:ietf:params:xml:ns:xmpp-framing", "jabber:client")
.replace("/>", ">");
.replace("urn:ietf:params:xml:ns:xmpp-framing", "jabber:client");
if !stanza.contains("xmlns:stream=") {
stanza.replace("/>", r#" xmlns:stream="http://etherx.jabber.org/streams">"#)
} else {
stanza.replace("/>", ">")
}
} else if stanza.starts_with("<close ") {
return "</stream:stream>".to_string();
"</stream:stream>".to_string()
} else {
stanza
}
stanza
}
pub fn to_ws_new(buf: &[u8], mut end_of_first_tag: usize, is_c2s: bool) -> Result<String> {
@ -156,6 +104,37 @@ pub fn to_ws_new(buf: &[u8], mut end_of_first_tag: usize, is_c2s: bool) -> Resul
Ok(ret)
}
use rustls::ServerName;
use std::convert::TryFrom;
use tokio_rustls::TlsConnector;
use tokio_tungstenite::tungstenite::client::IntoClientRequest;
use tokio_tungstenite::tungstenite::http::header::{ORIGIN, SEC_WEBSOCKET_PROTOCOL};
use tokio_tungstenite::tungstenite::http::Uri;
pub async fn websocket_connect(target: SocketAddr, server_name: &str, url: &Uri, origin: &str, _is_c2s: bool) -> Result<(StanzaWrite, StanzaRead)> {
// todo: WebSocketConfig
// todo: static ? alpn? client cert auth for server
let connector = rustls::ClientConfig::builder().with_safe_defaults().with_root_certificates(root_cert_store()).with_no_client_auth();
let mut request = url.into_client_request()?;
request.headers_mut().append(SEC_WEBSOCKET_PROTOCOL, "xmpp".parse()?);
request.headers_mut().append(ORIGIN, origin.parse()?);
let dnsname = ServerName::try_from(server_name)?;
let stream = tokio::net::TcpStream::connect(target).await?;
let connector = TlsConnector::from(Arc::new(connector));
let stream = connector.connect(dnsname, stream).await?;
let stream: tokio_rustls::TlsStream<tokio::net::TcpStream> = stream.into();
let (stream, _) = tokio_tungstenite::client_async_with_config(request, stream, None).await?;
let (wrt, rd) = stream.split();
Ok((StanzaWrite::WebSocketClientWrite(wrt), StanzaRead::WebSocketRead(rd)))
}
#[cfg(test)]
mod tests {
use crate::websocket::*;
@ -165,9 +144,14 @@ mod tests {
fn test_from_ws() {
assert_eq!(
from_ws(r#"<open xmlns="urn:ietf:params:xml:ns:xmpp-framing" version="1.0" to="test.moparisthe.best" xml:lang="en" />"#.to_string()),
r#"<?xml version='1.0'?><stream:stream xmlns:stream="http://etherx.jabber.org/streams" xmlns="jabber:client" version="1.0" to="test.moparisthe.best" xml:lang="en" >"#.to_string()
r#"<?xml version='1.0'?><stream:stream xmlns="jabber:client" version="1.0" to="test.moparisthe.best" xml:lang="en" xmlns:stream="http://etherx.jabber.org/streams">"#.to_string()
);
assert_eq!(from_ws(r#"<close xmlns="urn:ietf:params:xml:ns:xmpp-framing" />"#.to_string()), r#"</stream:stream>"#.to_string());
assert_eq!(
from_ws(r#"<open to='one.example.org' xmlns='urn:ietf:params:xml:ns:xmpp-framing' xmlns:stream='http://etherx.jabber.org/streams' version='1.0'/>"#.to_string()),
r#"<?xml version='1.0'?><stream:stream to='one.example.org' xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' version='1.0'>"#.to_string()
);
}
async fn to_vec_eoft<T: tokio::io::AsyncRead + Unpin>(mut stanza_reader: StanzaReader<T>, filter: &mut StanzaFilter) -> Result<Vec<String>> {