Add README & LICENSE

LICENSE

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+Copyright (c) 2024 Koen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# syslog-utils
+
+Simple syslog RFC3164 and RFC5424 command-line client & server.
+
+The client supports UDP, TCP and TLS transports and is useful to test syslog
+servers or simply to send syslog messages. The server supports TCP and TLS and
+will simply print any parsed messages to stdout.
+
+
+## Getting Started
+
+The easiest way to get started is by using the statically compiled release
+binaries or the docker image. Download the *syslog-client* and *syslog-server*
+binaries from the [latest release](/koenw/syslog-utils/releases) page.
+
+Run the client with `docker run ghcr.io/koenw/syslog-utils syslog-client` or
+the server with `docker run ghcr.io/koenw/syslog-utils syslog-server`.
+
+
+## Usage
+
+
+### syslog-client
+
+Simple command line syslog client to send RFC5424 or RFC3164 messages over UDP,
+TCP or TLS.
+
+
+#### Help
+
+```sh
+❯ syslog-client --help
+syslog-client 0.1.0
+Syslog client for diagnostic purposes
+
+USAGE:
+    syslog-client [FLAGS] [OPTIONS] <transport> [messages]...
+
+FLAGS:
+        --accept-invalid-certs        Accept invalid TLS certificates (insecure!)
+        --accept-invalid-hostnames    Accept TLS certificates for invalid hostnames (insecure!)
+    -h, --help                        Prints help information
+        --stdin                       Read log messages from stdin
+    -V, --version                     Prints version information
+
+OPTIONS:
+        --format <format>              Either rfc5424 or rfc3164 [default: rfc3164]
+        --host <host>                  Syslog server host [default: localhost]
+        --msg-id <msg-id>              RFC5424 message id, e.g. "TCPIN"
+        --port <port>
+            Syslog server port [default: 514(UDP), 601(TCP) or 6514(TLS)]
+
+        --sd-elements <sd-elements>
+            RFC5424 Structured Data Elements, e.g. "key=value,anotherkey=anothervalue"
+
+        --sd-id <sd-id>
+            RFC5424 SD-ID (Structured Data ID) [default: syslog-client@1234]
+
+        --severity <severity>          Message severity [default: notice]
+        --tls-domain <tls-domain>      Syslog server TLS domain [default: syslog server host]
+
+ARGS:
+    <transport>      Syslog transport protocol [possible values: tcp, udp,
+                     tls]
+    <messages>...    Log messages to send
+```
+
+
+#### Examples
+
+| Command | Description |
+| --- | --- |
+| `syslog-client tcp --port 5014 --format rfc5424 --sd-elements="key=value,nothing=equal" hello` | Send the message "hello" to port 5014, with RFC5424 Structured Data |
+| `syslog-client tls --host syslog.example.com --stdin` | Read messages on stdin and send them over TLS to syslog.example.com |
+| `syslog-client tls --accept-invalid-certs hello` | Send messages over TLS, ignoring certificate errors |
+
+
+### syslog-server
+
+
+#### Help
+
+```sh
+❯ syslog-server --help
+syslog-server 0.1.0
+Simple Syslog server for testing & development
+
+Currently TCP and TLS transports are supported, UDP might be added in the future. Received
+messages will be logged to stdout. Set the environmental variable variable `SYSLOG_SERVER_LOG`
+to one of the values (from quiet to verbose) `error`, `warn`, `info`, `debug` or `trace` to log
+more or less information.
+
+USAGE:
+    syslog-server [OPTIONS] <transport>
+
+FLAGS:
+    -h, --help
+            Prints help information
+
+    -V, --version
+            Prints version information
+
+
+OPTIONS:
+        --address <address>
+            Address to listen on [default: [::]]
+
+        --cert <certificate>
+            Path to file containing TLS certificate
+
+        --port <port>
+            Port to listen on [default: 514]
+
+        --key <private-key>
+            Path to file containing TLS private key
+
+
+ARGS:
+    <transport>
+            Syslog Protocol to accept [possible values: tcp, udp, tls]
+```
+
+
+#### Examples
+
+| Command | Description |
+| --- | --- |
+| `syslog-server tls --cert cert.pem --key.pem --port 5014` | Listen for TLS connections on port 5014 using the given key & certificate |
+| `SYSLOG_SERVER_LOG=debug syslog-server tcp --port 5014` | Listen for TCP connection on port 5014, being extra verbose about it |
+
+
+## Development
+
+Run `nix develop` for a development shell.
+
+| Command | Description |
+| --- | --- |
+| `nix develop` | Development shell including all dependencies |
+| `nix build '.#docker' && docker load <result` | Build and load a docker image |
+| `nix build '.#static'` | Build static (musl) binaries |
+| `nix build '.#native'` | Build dynamically linked binaries |
+| `just gen-selfsigned-cert` | Generate a self-signed certificate for use with the TLS server |