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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..0f8ca6a
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "tcpmux"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = { version = "4.4", features = ["derive"] }
+serde = "1.0"
+serde_derive = "1.0"
+serde_json = "1.0"
+tokio = { version = "1.32", features = ["full"] }
+toml = "0.7.6"
+tracing = "0.1"
+tracing-subscriber = "0.3"
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f288702
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
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+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/example/client.toml b/example/client.toml
new file mode 100644
index 0000000..fff3308
--- /dev/null
+++ b/example/client.toml
@@ -0,0 +1,7 @@
+[client]
+addr = "127.0.0.1:10000"
+
+[[service]]
+name = "Telnet"
+addr = "127.0.0.1:1112"
+
diff --git a/example/server.toml b/example/server.toml
new file mode 100644
index 0000000..e443ef2
--- /dev/null
+++ b/example/server.toml
@@ -0,0 +1,19 @@
+[server]
+listen = "0.0.0.0:10000"
+allow_help = false
+
+[[service]]
+name = "SSH"
+addr = "127.0.0.1:22"
+
+[[service]]
+name = "Telnet"
+addr = "127.0.0.1:1111"
+
+[[service]]
+name = "Website"
+addr = "127.0.0.1:80"
+
+[[service]]
+name = "RemoteDesktop"
+addr = "127.0.0.1:3389"
diff --git a/src/arguments.rs b/src/arguments.rs
new file mode 100644
index 0000000..5f3d8e2
--- /dev/null
+++ b/src/arguments.rs
@@ -0,0 +1,17 @@
+use clap::{arg, Parser};
+
+#[derive(Parser, Debug)]
+#[command(author, version, about, long_about = None)]
+pub struct Args {
+    pub mode: Mode,
+
+    /// The config file to use
+    #[arg(short, long)]
+    pub config: String,
+}
+
+#[derive(clap::ValueEnum, Clone, Debug)]
+pub enum Mode {
+    SERVER,
+    CLIENT,
+}
diff --git a/src/client.rs b/src/client.rs
new file mode 100644
index 0000000..1e2edc4
--- /dev/null
+++ b/src/client.rs
@@ -0,0 +1,112 @@
+use std::io;
+use std::net::ToSocketAddrs;
+
+use tokio::io::{copy_bidirectional, AsyncReadExt, AsyncWriteExt};
+use tokio::net::{TcpSocket, TcpStream};
+use tracing::{error, info, warn};
+
+pub async fn handle_client(
+    mut sock: TcpStream,
+    upstream: &String,
+    service_name: &String,
+) -> io::Result<()> {
+    let remote = match upstream.to_socket_addrs() {
+        Ok(mut addrs) => match addrs.next() {
+            None => {
+                error!("Cannot resolve addr: {}", &upstream);
+                return Ok(());
+            }
+            Some(sa) => sa,
+        },
+        Err(why) => {
+            error!("Failed to resolve addr: {}", why);
+            return Ok(());
+        }
+    };
+    let remote_sock;
+    if remote.is_ipv4() {
+        remote_sock = TcpSocket::new_v4();
+    } else {
+        remote_sock = TcpSocket::new_v6();
+    }
+    let remote_sock = match remote_sock {
+        Ok(rs) => rs,
+        Err(why) => {
+            error!("Failed to create socket: {}", why);
+            return Ok(());
+        }
+    };
+    let mut remote_sock = match remote_sock.connect(remote).await {
+        Ok(s) => s,
+        Err(why) => {
+            error!("Failed to connect to upstream: {}", why);
+            return Ok(());
+        }
+    };
+    send_upstream(&mut remote_sock, service_name.as_bytes()).await?;
+    send_upstream(&mut remote_sock, b"\r\n").await?;
+    remote_sock.flush().await?;
+    let status = remote_sock.read_u8().await?;
+    let mut msg = vec![0_u8; 1024];
+    let mut i = 0;
+    let mut prev_is_cr = false;
+    loop {
+        let b = remote_sock.read_u8().await?;
+        if i < msg.len() {
+            msg[i] = b;
+        }
+        if b == b'\n' && prev_is_cr {
+            if i < msg.len() {
+                i -= 2; // remove CRLF from reported message string
+            }
+            break;
+        }
+        i += 1;
+        prev_is_cr = b == b'\r';
+    }
+    let msg = match std::str::from_utf8(&msg[..i]) {
+        Ok(s) => s,
+        Err(why) => {
+            warn!(
+                "Failed to decode server message as UTF-8 string, ignore: {}",
+                why
+            );
+            "???"
+        }
+    };
+    match status {
+        b'+' => {
+            info!("Upstream service selected successfully: {}", msg);
+        }
+        b'-' => {
+            error!("Upstream responded with negative status: {}", msg);
+            return Ok(());
+        }
+        b => {
+            error!("Invalid status returned from upstream, abort: {:x?}", b);
+            return Ok(());
+        }
+    }
+    match copy_bidirectional(&mut sock, &mut remote_sock).await {
+        Ok((to_right, to_left)) => {
+            info!(
+                "Proxy session finished. Bytes: client to upstream: {}, upstream to client: {}",
+                to_right, to_left
+            );
+        }
+        Err(why) => {
+            error!("Proxy connection was closed abnormally: {}", why);
+        }
+    };
+    Ok(())
+}
+
+async fn send_upstream(remote: &mut TcpStream, data: &[u8]) -> io::Result<()> {
+    match remote.write_all(data).await {
+        Ok(_) => Ok(()),
+        Err(why) => {
+            error!("Failed to send bytes to upstream: {}", why);
+            Err(why)
+        }
+    }
+}
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..7eee270
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,30 @@
+use serde_derive::{Deserialize, Serialize};
+
+#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct Server {
+    pub listen: String,
+}
+
+#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct Service {
+    pub name: String,
+    pub addr: String, // host:port
+}
+
+#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct Client {
+    pub addr: String,
+}
+
+#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct Root {
+    pub server: Option<Server>,
+    pub client: Option<Client>,
+    pub service: Vec<Service>,
+    #[serde(default = "default_true")]
+    pub allow_help: bool,
+}
+
+fn default_true() -> bool {
+    true
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..b588f2d
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,133 @@
+use std::io;
+use std::path::Path;
+use std::process::exit;
+
+use clap::Parser;
+use tokio::net::TcpListener;
+use tracing::{debug, error, info};
+
+use crate::arguments::Mode;
+use crate::server::SharedConfig;
+
+mod arguments;
+mod client;
+mod config;
+mod server;
+
+fn load_config<P: AsRef<Path>>(file_path: P) -> config::Root {
+    let content = match std::fs::read_to_string(file_path) {
+        Ok(s) => s,
+        Err(why) => {
+            error!("Failed to read config file: {}", why);
+            exit(1);
+        }
+    };
+    let cfg: config::Root = match toml::from_str(content.as_str()) {
+        Ok(c) => c,
+        Err(why) => {
+            error!("Failed to parse config file: {}", why);
+            exit(1);
+        }
+    };
+    cfg
+}
+
+fn validate_config(cfg: &config::Root) {
+    for s in &cfg.service {
+        if s.name.contains("\r\n") {
+            error!("Service name contains CRLF: `{}`", &s.name);
+            exit(1);
+        }
+    }
+}
+
+#[tokio::main]
+async fn main() -> io::Result<()> {
+    tracing_subscriber::fmt::init();
+
+    let args = arguments::Args::parse();
+    info!("args: {:?}", args);
+    let cfg = load_config(&args.config);
+
+    validate_config(&cfg);
+
+    match args.mode {
+        Mode::SERVER => {
+            if cfg.server == None {
+                error!("Config `server` is required in current mode");
+                exit(1);
+            }
+            if cfg.service.is_empty() {
+                error!("No service is defined");
+                exit(1);
+            }
+            server_main(cfg).await
+        }
+        Mode::CLIENT => {
+            if cfg.client == None {
+                error!("Config `client` is required in current mode");
+                exit(1);
+            }
+            client_main(cfg).await
+        }
+    }
+}
+
+async fn server_main(cfg: config::Root) -> io::Result<()> {
+    let listener = TcpListener::bind(cfg.server.unwrap().listen).await?;
+    info!("Server listening on {:?}", listener);
+    let max_srv_name_length = cfg
+        .service
+        .iter()
+        .map(|s| s.name.len())
+        .max()
+        .expect("No service was defined in config");
+    debug!("Max service name length: {}", max_srv_name_length);
+    // this immutable object lives throughout the entire process lifetime,
+    // so we use 'static here for simplicity
+    let shared_config: &'static SharedConfig = Box::leak(Box::new(SharedConfig {
+        max_srv_name_length,
+        services: cfg.service,
+        allow_help: cfg.allow_help,
+    }));
+    loop {
+        let (sock, addr) = listener.accept().await?;
+        tokio::spawn(server::handle_client(shared_config, sock, addr));
+    }
+}
+
+async fn client_server_main(
+    upstream_addr: &'static String,
+    listener: TcpListener,
+    service_name: &'static String,
+) -> io::Result<()> {
+    loop {
+        let (sock, addr) = listener.accept().await?;
+        info!("Client connected: {}", addr);
+        tokio::spawn(client::handle_client(sock, upstream_addr, service_name));
+    }
+}
+
+async fn client_main(cfg: config::Root) -> io::Result<()> {
+    let mut fut_servers = Vec::new();
+
+    let upstream_addr = Box::leak(Box::new(cfg.client.unwrap().addr));
+
+    for s in cfg.service {
+        let listener = TcpListener::bind(&s.addr).await?;
+        info!("Server listening on {:?} (service {})", listener, &s.name);
+        let service_name = Box::leak(Box::new(s.name));
+        fut_servers.push(tokio::spawn(client_server_main(
+            upstream_addr,
+            listener,
+            service_name,
+        )));
+    }
+
+    for fut in fut_servers {
+        if let Err(why) = fut.await {
+            error!("Failed to join server future: {}", why);
+        }
+    }
+    Ok(())
+}
diff --git a/src/server.rs b/src/server.rs
new file mode 100644
index 0000000..968bfeb
--- /dev/null
+++ b/src/server.rs
@@ -0,0 +1,132 @@
+use std::net::{SocketAddr, ToSocketAddrs};
+
+use tokio::io::{copy_bidirectional, AsyncReadExt, AsyncWriteExt};
+use tokio::net::{TcpSocket, TcpStream};
+use tracing::{error, info};
+
+use crate::config;
+
+pub struct SharedConfig {
+    pub max_srv_name_length: usize,
+    pub services: Vec<config::Service>,
+    pub allow_help: bool,
+}
+
+const ERR_SERVICE_NAME_NOT_FOUND: &str = "-Invalid service name\r\n";
+const ERR_SERVICE_NAME_ENCODING: &str = "-Service name is not a UTF-8 string\r\n";
+const OK: &str = "+OK\r\n";
+const SERVICE_HELP: &str = "HELP";
+
+pub async fn handle_client(cfg: &SharedConfig, mut sock: TcpStream, addr: SocketAddr) {
+    info!("New client: {}", addr);
+    let cap = cfg.max_srv_name_length + 2;
+    let mut service_name_buf = vec![0_u8; cap];
+    let mut i = 0;
+    let mut ok = false;
+    while i < service_name_buf.len() {
+        service_name_buf[i] = match sock.read_u8().await {
+            Ok(b) => b,
+            Err(why) => {
+                error!("Read byte failed: {}", why);
+                return;
+            }
+        };
+        if i >= 1 && service_name_buf[i] == b'\n' && service_name_buf[i - 1] == b'\r' {
+            ok = true;
+            break;
+        }
+        i += 1;
+    }
+    if !ok {
+        error!(
+            "Service name too long, can't be a valid one: {:?}",
+            service_name_buf
+        );
+        // Cannot equal to any valid service name
+        let _ = sock.write_all(ERR_SERVICE_NAME_NOT_FOUND.as_bytes()).await;
+        return;
+    }
+    let wanted_srv_name: &str = match std::str::from_utf8(&service_name_buf.as_slice()[..i - 1]) {
+        Ok(s) => s,
+        Err(_) => {
+            let _ = sock.write_all(ERR_SERVICE_NAME_ENCODING.as_bytes()).await;
+            return;
+        }
+    };
+    if cfg.allow_help && wanted_srv_name == SERVICE_HELP {
+        for s in &cfg.services {
+            if let Err(_) = sock.write_all(s.name.as_bytes()).await {
+                return;
+            }
+            if let Err(_) = sock.write_all(b"\r\n").await {
+                return;
+            }
+        }
+        return;
+    }
+    let mut srv = None;
+    for s in &cfg.services {
+        if s.name == wanted_srv_name {
+            srv = Some(s);
+            break;
+        }
+    }
+    if srv == None {
+        error!("Service name not found: {}", wanted_srv_name);
+        let _ = sock.write_all(ERR_SERVICE_NAME_NOT_FOUND.as_bytes()).await;
+        return;
+    }
+    let srv = srv.unwrap();
+    info!("Client selected service: {}", srv.name);
+    if let Err(why) = sock.write_all(OK.as_bytes()).await {
+        error!("Failed to send command to client: {}", why);
+        return;
+    }
+    let remote = match srv.addr.to_socket_addrs() {
+        Ok(mut addrs) => match addrs.next() {
+            None => {
+                error!("Cannot resolve addr: {}", srv.addr);
+                return;
+            }
+            Some(sa) => sa,
+        },
+        Err(why) => {
+            error!("Failed to resolve addr: {}", why);
+            return;
+        }
+    };
+    let remote_sock;
+    if remote.is_ipv4() {
+        remote_sock = TcpSocket::new_v4();
+    } else {
+        remote_sock = TcpSocket::new_v6();
+    }
+    let remote_sock = match remote_sock {
+        Ok(rs) => rs,
+        Err(why) => {
+            error!("Failed to create socket: {}", why);
+            return;
+        }
+    };
+    let mut remote_sock = match remote_sock.connect(remote).await {
+        Ok(s) => s,
+        Err(why) => {
+            error!(
+                "Failed to connect to upstream of service {}: {}",
+                &srv.name, why
+            );
+            return;
+        }
+    };
+    match copy_bidirectional(&mut sock, &mut remote_sock).await {
+        Ok((to_right, to_left)) => {
+            info!(
+                "Proxy session finished. Bytes: client to service: {}, service to client: {}",
+                to_right, to_left
+            );
+        }
+        Err(why) => {
+            error!("Proxy connection was closed abnormally: {}", why);
+        }
+    };
+}