mirror of
https://github.com/shadowsocks/shadowsocks-libev.git
synced 2026-10-21 14:33:55 +00:00
Max LvandClaude
553cdc7945
Add `ss-local --printable-salt` / `"printable_salt": true`, disabled by default. For each outgoing TCP salt it picks a prefix length uniformly from 6-12 bytes and samples those bytes as printable ASCII (0x20-0x7e) immediately before key derivation. The salt stays 32 bytes with no framing or markers, so the wire format is unchanged and any stock server interoperates. Only chacha20-ietf-poly1305 and aes-256-gcm are accepted; other ciphers fail at startup. UDP, server responses, and AEAD-2022 are untouched. Crypto unit tests cover length distribution, empty first writes, exact framing overhead, salt-tail preservation, byte-at-a-time decryption, tampering and replay rejection. CLI tests check local-only exposure and cipher rejection via flag, config key and bad config type. interop.py gains --printable-salt and --server-bin for independent stock servers. docs/printable-salt.md records the design, entropy bound, fingerprint caveats and route-experiment procedure; docs/encoding-experiments.md and tests/experiments/ hold the Base85/lowpop85/TLS outer-transport prototypes. docs/measurements/printable-salt-2026-09-23/ archives the sanitized results of the aborted field trials. Co-authored-by: Claude <noreply@anthropic.com>
179 lines
5.4 KiB
Markdown
179 lines
5.4 KiB
Markdown
\page shadowsocks-c shadowsocks-c
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\brief a lightweight and secure socks5 proxy
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\section overview_synopsis SYNOPSIS
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*ss-local* [options]
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*ss-server* [options]
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*ss-tunnel* [options]
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*ss-redir* [options]
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*ss-manager* [options]
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*ss-nat* [options]
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\section overview_description DESCRIPTION
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*shadowsocks-c* is a lightweight and secure socks5 proxy.
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It is a port of the original shadowsocks created by clowwindy.
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*shadowsocks-c* is written in pure C and takes advantage of *libuv*
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to achieve both high performance and low resource consumption.
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*shadowsocks-c* consists of five components. One is ss-server(1)
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that runs on a remote server to provide secured tunnel service.
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ss-local(1) and ss-redir(1) are clients on your local machines to proxy
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traffic(TCP/UDP or both).
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ss-tunnel(1) is a tool for local port forwarding.
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While ss-local(1) works as a standard socks5 proxy, ss-redir(1) works
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as a transparent proxy and requires netfilter's NAT module. For more
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information, check out the `EXAMPLE` section.
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ss-manager(1) is a controller for multi-user management and traffic
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statistics, using UNIX domain socket to talk with ss-server(1).
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Also, it provides a UNIX domain socket or IP based API for other software.
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About the details of this API, please refer to the `PROTOCOL` section.
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\section overview_options OPTIONS
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**ss-local(1)**
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See this command's generated SYNOPSIS and OPTIONS for its accepted arguments.
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**ss-server(1)**
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See this command's generated SYNOPSIS and OPTIONS for its accepted arguments.
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**ss-tunnel(1)**
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See this command's generated SYNOPSIS and OPTIONS for its accepted arguments.
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**ss-redir(1)**
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See this command's generated SYNOPSIS and OPTIONS for its accepted arguments.
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**ss-manager(1)**
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See this command's generated SYNOPSIS and OPTIONS for its accepted arguments.
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**ss-nat(1)**
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See this command's generated SYNOPSIS and OPTIONS for its accepted arguments.
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\section overview_config_file CONFIG FILE
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The config file is written in JSON and easy to edit.
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The config file equivalent of command line options is listed as examples below.
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- `-s some.server.net`: `"server": "some.server.net"`
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- `-s some.server.net -p 1234 (client)`: `"server": "some.server.net:1234"`
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- `-p 1234`: `"server_port": "1234"`
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- `-b 0.0.0.0`: `"local_address": "0.0.0.0"`
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- `-b 10.0.0.2`: `"local_ipv4_address": "10.0.0.2"`
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- `-b 2620:129:35::33`: `"local_ipv6_address": "2620:129:35::33"`
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- `-l 4321`: `"local_port": "4321"`
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- `-k "PasSworD"`: `"password": "PasSworD"`
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- `-m "aes-256-cfb"`: `"method": "aes-256-cfb"`
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- `-t 60`: `"timeout": 60`
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- `-a nobody`: `"user": "nobody"`
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- `--acl "/path/to/acl"`: `"acl": "/path/to/acl"`
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- `--fast-open`: `"fast_open": true`
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- `--reuse-port`: `"reuse_port": true`
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- `--no-delay`: `"no_delay": true`
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- `--printable-salt`: `"printable_salt": true` (ss-local only)
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- `--plugin "obfs-server"`: `"plugin": "obfs-server"`
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- `--plugin-opts "obfs=http"`: `"plugin_opts": "obfs=http"`
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- `-6`: `"ipv6_first": true`
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- `-n 1024`: `"nofile": 1024`
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- `-d "8.8.8.8"`: `"nameserver": "8.8.8.8"`
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- `-L "somedns.net:53"`: `"tunnel_address": "somedns.net:53"`
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- `-u`: `"mode": "tcp_and_udp"`
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- `-U`: `"mode": "udp_only"`
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- `no "-u" nor "-U" options (default)`: `"mode": "tcp_only"`
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- `-T`: `"tcp_tproxy": true`
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- `(only in ss-manager's config)`: `"port_password": {"1234":"PasSworD"}`
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\section overview_example EXAMPLE
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`ss-redir` requires netfilter's NAT function. Here is an example:
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```
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# Create new chain
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iptables -t nat -N SHADOWSOCKS
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iptables -t mangle -N SHADOWSOCKS
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# Ignore your shadowsocks server's addresses
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# It's very IMPORTANT, just be careful.
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iptables -t nat -A SHADOWSOCKS -d 123.123.123.123 -j RETURN
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# Ignore LANs and any other addresses you'd like to bypass the proxy
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# See Wikipedia and RFC5735 for full list of reserved networks.
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# See ashi009/bestroutetb for a highly optimized CHN route list.
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iptables -t nat -A SHADOWSOCKS -d 0.0.0.0/8 -j RETURN
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iptables -t nat -A SHADOWSOCKS -d 10.0.0.0/8 -j RETURN
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iptables -t nat -A SHADOWSOCKS -d 127.0.0.0/8 -j RETURN
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iptables -t nat -A SHADOWSOCKS -d 169.254.0.0/16 -j RETURN
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iptables -t nat -A SHADOWSOCKS -d 172.16.0.0/12 -j RETURN
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iptables -t nat -A SHADOWSOCKS -d 192.168.0.0/16 -j RETURN
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iptables -t nat -A SHADOWSOCKS -d 224.0.0.0/4 -j RETURN
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iptables -t nat -A SHADOWSOCKS -d 240.0.0.0/4 -j RETURN
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# Anything else should be redirected to shadowsocks's local port
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iptables -t nat -A SHADOWSOCKS -p tcp -j REDIRECT --to-ports 12345
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# Add any UDP rules
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ip rule add fwmark 0x01/0x01 table 100
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ip route add local 0.0.0.0/0 dev lo table 100
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iptables -t mangle -A SHADOWSOCKS -p udp --dport 53 -j TPROXY --on-port 12345 --tproxy-mark 0x01/0x01
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# Apply the rules
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iptables -t nat -A PREROUTING -p tcp -j SHADOWSOCKS
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iptables -t mangle -A PREROUTING -j SHADOWSOCKS
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# Start the shadowsocks-redir
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ss-redir -u -c /etc/config/shadowsocks.json -f /var/run/shadowsocks.pid
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```
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\section overview_protocol PROTOCOL
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**ss-manager(1) provides several APIs through UDP protocol**
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**Send UDP commands in the following format to the manager-address provided to ss-manager(1):**
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```text
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command: [JSON data]
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```
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**To add a port:**
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```text
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add: {"server_port": 8001, "password":"7cd308cc059"}
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```
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**To remove a port:**
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```text
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remove: {"server_port": 8001}
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```
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**To receive a pong:**
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```text
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ping
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```
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**Then ss-manager(1) will send back the traffic statistics:**
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```text
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stat: {"8001":11370}
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```
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\section overview_see_also SEE ALSO
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ss-local(1),
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ss-server(1),
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ss-tunnel(1),
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ss-redir(1),
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ss-manager(1),
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iptables(8),
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/etc/shadowsocks-libev/config.json
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