ss-tunnel(1)
============

NAME
----
ss-tunnel - shadowsocks tools for local port forwarding, C implementation

SYNOPSIS
--------
// Generated by scripts/gen_cli_docs.py from src/tunnel.c; do not edit this section.

*ss-tunnel* [-f <pid_file>] [-s <server_host>] [-p <server_port>] [-l
 <local_port>] [-k <password>] [-t <timeout>] [-m <encrypt_method>] [-i
 <interface>] [-c <config_file>] [-b <local_address>] [-L <addr:port>] [-a
 <user_name>] [-n <number>] [-h] [-u] [-U] [-v] [-V] [-6] [-A] [--fast-open]
 [--mtu <MTU>] [--no-delay] [--mptcp] [--plugin <plugin_name>] [--plugin-opts
 <plugin_options>] [--reuse-port] [--tcp-incoming-sndbuf <size>]
 [--tcp-incoming-rcvbuf <size>] [--tcp-outgoing-sndbuf <size>]
 [--tcp-outgoing-rcvbuf <size>] [--password <password>] [--key
 <key_in_base64>] [--help]

DESCRIPTION
-----------
*shadowsocks-c* is a lightweight and secure socks5 proxy.
It is a port of the original shadowsocks created by clowwindy.
*shadowsocks-c* is written in pure C and takes advantage of libuv to
achieve both high performance and low resource consumption.

*shadowsocks-c* consists of five components.
`ss-tunnel`(1) is a tool for local port forwarding.
See 'OPTIONS' section for special option needed by `ss-tunnel`(1).
For more information, check out `shadowsocks-libev`(8).

OPTIONS
-------
// Generated by scripts/gen_cli_docs.py from src/tunnel.c; do not edit this section.

This section lists options across supported builds. Platform and feature
restrictions are noted below; not every option is effective on every platform.

-f <pid_file>::
Start shadowsocks as a daemon with specific pid file.

-s <server_host>::
Set the server's hostname or IP.

-p <server_port>::
Set the server's port number.

-l <local_port>::
Set the local port number.

-k <password>::
Set the password. The server and the client should use the same password.

-t <timeout>::
Set the socket timeout in seconds. The default value is 60.

-m <encrypt_method>::
Set the cipher. The default is 'chacha20-ietf-poly1305'.
+
AEAD cipher names from the source (availability depends on the build):
aes-128-gcm, aes-192-gcm, aes-256-gcm, 2022-blake3-aes-128-gcm, 2022-blake3-aes-256-gcm, chacha20-ietf-poly1305, 2022-blake3-chacha20-poly1305, xchacha20-ietf-poly1305.
+
Legacy stream cipher names recognized by the source (disabled in minimal builds;
some require backend support): table, rc4, rc4-md5, aes-128-cfb, aes-192-cfb, aes-256-cfb, aes-128-ctr, aes-192-ctr, aes-256-ctr, bf-cfb, camellia-128-cfb, camellia-192-cfb, camellia-256-cfb, cast5-cfb, des-cfb, idea-cfb, rc2-cfb, seed-cfb, salsa20, chacha20, chacha20-ietf.
+
The '2022-blake3-*' ciphers implement Shadowsocks 2022 (SIP022). They require
a base64-encoded pre-shared key supplied with *-k*: 16 bytes for
2022-blake3-aes-128-gcm and 32 bytes for the other 2022 ciphers.
Generate a 32-byte key with `openssl rand -base64 32`.
Passwords are not stretched into keys for these ciphers.

-i <interface>::
Send outbound traffic through the specified network interface where supported by the platform.

-c <config_file>::
Use a configuration file.
+
Refer to `shadowsocks-c`(8) 'CONFIG FILE' section for more details.

-b <local_address>::
Specify the local address to use while this client is making outbound
connections to the server.

-L <addr:port>::
Destination server address and port for local port forwarding.

-a <user_name>::
Run as a specific user.

-n <number>::
Specify the maximum number of open files. Requires a platform with setrlimit support.

-h::
Print help message.

-u::
Enable UDP relay.

-U::
Enable UDP relay and disable TCP relay.

-v::
Enable verbose mode.

-V::
Android only: enable VPN socket protection.

-6::
Resolve hostname to IPv6 address first.

-A::
Deprecated one-time authentication option. Exits with an error; use AEAD ciphers instead.

--fast-open::
Enable TCP Fast Open where supported by the operating system.

--mtu <MTU>::
Specify the MTU of your network interface.

--no-delay::
Enable TCP_NODELAY.

--mptcp::
Enable Multipath TCP.
+
Only available with MPTCP enabled Linux kernel.

--plugin <plugin_name>::
Enable SIP003 plugin. (Experimental)

--plugin-opts <plugin_options>::
Set SIP003 plugin options. (Experimental)

--reuse-port::
Enable port reuse where supported by the operating system.

--tcp-incoming-sndbuf <size>::
Set TCP send buffer size for incoming connections.

--tcp-incoming-rcvbuf <size>::
Set TCP receive buffer size for incoming connections.

--tcp-outgoing-sndbuf <size>::
Set TCP send buffer size for outgoing connections.

--tcp-outgoing-rcvbuf <size>::
Set TCP receive buffer size for outgoing connections.

--password <password>::
Set the password. The server and the client should use the same password.

--key <key_in_base64>::
Set the key directly. The key should be encoded with URL-safe Base64.

--help::
Print help message.

EXAMPLE
-------
`ss-tunnel`(1) can be used to forward DNS queries to a remote DNS server
through the shadowsocks tunnel. Here is an example:

....
# Forward local UDP port 5353 to 8.8.8.8:53 through the ss-server
ss-tunnel -s example.com -p 12345 -l 5353 -k foobar -m aes-256-cfb -L 8.8.8.8:53 -u

# Then configure your system to use 127.0.0.1:5353 as the DNS server
dig @127.0.0.1 -p 5353 www.google.com
....

SEE ALSO
--------
`ss-local`(1),
`ss-server`(1),
`ss-redir`(1),
`ss-manager`(1),
`shadowsocks-libev`(8),
`iptables`(8),
/etc/shadowsocks-libev/config.json