2 files changed, 83 insertions(+), 0 deletions(-)

A LICENSE.md
A main.go

@@ 1,25 @@
+BSD 2-Clause License
+
+Copyright (c) 2019, Humaid AlQassimi
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

@@ 1,58 @@
+/* This is an Oww protocol implementation in Go.
+
+There are two methods to this protocol.
+- Post method:
+<Name>: Oww <optional message>
+- List method:
+Owws
+
+And these can be done using netcat.
+*/
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"net"
+	"regexp"
+)
+
+var (
+	PORT     = ":1999"
+	OwwPosts = []string{"Server: Oww"}
+)
+
+var (
+	ListOwwsExp = regexp.MustCompile(`^(Owws)`)
+	PostOwwExp  = regexp.MustCompile(`^[a-zA-Z0-9 ]+: ((?i)Oww)`)
+)
+
+func handleConnection(con net.Conn) {
+	buf := make([]byte, 1024)
+	con.Read(buf)
+	buf = bytes.TrimSpace(buf)
+	if ListOwwsExp.Match(buf) {
+		for _, oww := range OwwPosts {
+			con.Write([]byte(fmt.Sprintf("%s\n", oww)))
+		}
+	} else if PostOwwExp.Match(buf) {
+		con.Write([]byte("Oww\n"))
+		OwwPosts = append(OwwPosts, string(buf))
+	}
+	con.Close()
+}
+
+func main() {
+	fmt.Printf("Listening on %s\n", PORT)
+	ln, err := net.Listen("tcp", PORT)
+	if err != nil {
+		panic(err)
+	}
+	for {
+		conn, err := ln.Accept()
+		if err != nil {
+			panic(err)
+		}
+		go handleConnection(conn)
+	}
+}