diff options
Diffstat (limited to '')
| -rw-r--r-- | main.go | 295 |
1 files changed, 295 insertions, 0 deletions
@@ -0,0 +1,295 @@ +/* SPDX-License-Identifier: CC0-1.0 */ + +package main + +import ( + "bufio" + "crypto/tls" + "fmt" + "net" + "os" + "strings" + "time" + // "log" +) + +type Config struct { + Sid string + ServerName string + SendPassword string + Description string + MainNick string + MainRealHost string + MainHost string + MainIdent string + MainAddr string + MainUserTs string + MainUmode string + MainGecos string + MainJoinChannels []string + MainChannelModeOnJoin string + MainChannelModeAfterJoin string + MainUidWithoutSid string + MainNickTs string + Connect string +} + +func loadConfig(filename string) (Config, error) { + file, err := os.Open(filename) + if err != nil { + return Config{}, err + } + defer file.Close() + + config := Config{} + scanner := bufio.NewScanner(file) + for scanner.Scan() { + line := scanner.Text() + parts := strings.SplitN(line, "=", 2) + if len(parts) != 2 { + continue + } + key, value := parts[0], parts[1] + switch key { + case "sid": + config.Sid = value + case "server_name": + config.ServerName = value + case "send_password": + config.SendPassword = value + case "description": + config.Description = value + case "main_nick": + config.MainNick = value + case "main_real_host": + config.MainRealHost = value + case "main_host": + config.MainHost = value + case "main_ident": + config.MainIdent = value + case "main_addr": + config.MainAddr = value + case "main_user_ts": + config.MainUserTs = value + case "main_umode": + config.MainUmode = value + case "main_gecos": + config.MainGecos = value + case "main_join_channels": + config.MainJoinChannels = strings.Split(value, ",") + case "main_channel_mode_on_join": + config.MainChannelModeOnJoin = value + case "main_channel_mode_after_join": + config.MainChannelModeAfterJoin = value + case "main_uid_without_sid": + config.MainUidWithoutSid = value + case "main_nick_ts": + config.MainNickTs = value + case "connect": + config.Connect = value + } + } + if err := scanner.Err(); err != nil { + return Config{}, err + } + + return config, nil +} + +func handleMessage(conn net.Conn, msg string, config Config) { + var prefix string + + if strings.HasPrefix(msg, "@") { + firstSpaceIndex := strings.Index(msg, " ") + if firstSpaceIndex == -1 { + fmt.Fprintf(conn, ":%s ERROR :IRCv3 tag, but no space\n", config.Sid) + return + } + msg = msg[firstSpaceIndex+1:] + } + if strings.HasPrefix(msg, ":") { + firstSpaceIndex := strings.Index(msg, " ") + if firstSpaceIndex == -1 { + fmt.Fprintf(conn, ":%s ERROR :Prefix, but no space\n", config.Sid) + return + } + prefix = msg[1:firstSpaceIndex] + msg = msg[firstSpaceIndex+1:] + } + + var msgArray []string + for { + spaceIndex := strings.Index(msg, " ") + if msg[0] == ':' { + msgArray = append(msgArray, msg[1:]) + break + } else if spaceIndex == -1 { + msgArray = append(msgArray, msg) + break + } + msgArray = append(msgArray, msg[:spaceIndex]) + msg = msg[spaceIndex+1:] + } + + switch msgArray[0] { + case "PING": + handlePing(conn, msgArray, prefix, config) + case "PRIVMSG": + handlePrivMsg(conn, msgArray, prefix, config) + default: + // fmt.Printf("Unknown command %s\n", msgArray[0]) + } +} + +func handlePing(conn net.Conn, msgArray []string, prefix string, config Config) { + if len(msgArray) == 2 { + if msgArray[1] != config.Sid { + fmt.Fprintf(conn, ":%s ERROR :Got PING intended for \"%s\"\n", config.Sid, msgArray[1]) + return + } + if prefix == "" { + fmt.Fprintf(conn, ":%s ERROR :Got PING with one argument without prefix\n", config.Sid) + return + } + fmt.Fprintf(conn, ":%s PONG :%s\n", config.Sid, prefix) + } else if len(msgArray) == 3 { + fmt.Fprintf(conn, ":%s PONG %s :%s\n", config.Sid, msgArray[2], msgArray[1]) + } else { + fmt.Fprintf(conn, ":%s ERROR :msgArray.length\n", config.Sid) + } +} + +func handlePrivMsg(conn net.Conn, msgArray []string, prefix string, config Config) { + if prefix == "" { + fmt.Fprintf(conn, ":%s ERROR :Got PRIVMSG without prefix\n", config.Sid) + return + } + + replyTo := config.MainJoinChannels[0] + if strings.HasPrefix(msgArray[1], "#") { + if !contains(config.MainJoinChannels, msgArray[1]) { + return + } + if !strings.HasPrefix(msgArray[2], fmt.Sprintf("%s: ", config.MainNick)) { + return + } + msgArray[2] = msgArray[2][len(fmt.Sprintf("%s: ", config.MainNick)):] + replyTo = msgArray[1] + } else if msgArray[1] == fmt.Sprintf("%s%s", config.Sid, config.MainUidWithoutSid) { + replyTo = prefix + } else { + return + } + + cmdArray := strings.Split(msgArray[2], " ") + for i := 0; i < len(cmdArray); i++ { + if strings.HasPrefix(cmdArray[i], ":") { + cmdArray[i] = cmdArray[i][1:] + " " + strings.Join(cmdArray[i+1:], " ") + cmdArray = cmdArray[:i+1] + break + } + } + cmdArray[0] = strings.ToUpper(cmdArray[0]) + + switch cmdArray[0] { + case "HELP": + fmt.Fprintf(conn, ":%s%s NOTICE %s :Hi! I am an instance of https://git.sr.ht/~runxiyu/htmlserv/, an ultra-cursed joke InspIRCd pseudoserver written in Go.\n", config.Sid, config.MainUidWithoutSid, replyTo) + case "`": + if len(cmdArray) > 1 { + fmt.Fprintf(conn, cmdArray[1]+"\n") + } + default: + fmt.Fprintf(conn, ":%s%s NOTICE %s :Unknown command: %s\n", config.Sid, config.MainUidWithoutSid, replyTo, cmdArray[0]) + } +} + +func connect(config Config) { + tlsConfig := &tls.Config{ + InsecureSkipVerify: true, + } + + conn, err := tls.Dial("tcp", config.Connect, tlsConfig) + if err != nil { + fmt.Println("Error connecting:", err) + return + } + defer conn.Close() + + reader := bufio.NewReader(conn) + writer := bufio.NewWriter(conn) + + writer.WriteString("CAPAB START 1205\n") + writer.WriteString("CAPAB END\n") + writer.WriteString(fmt.Sprintf("SERVER %s %s 0 %s :%s\n", config.ServerName, config.SendPassword, config.Sid, config.Description)) + writer.WriteString(fmt.Sprintf("BURST %d\n", time.Now().Unix())) + writer.WriteString(fmt.Sprintf( + ":%s UID %s%s %s %s %s %s %s %s %s %s :%s\n", + config.Sid, + config.Sid, + config.MainUidWithoutSid, + config.MainNickTs, + config.MainNick, + config.MainRealHost, + config.MainHost, + config.MainIdent, + config.MainAddr, + config.MainUserTs, + config.MainUmode, + config.MainGecos, + )) + for _, channelName := range config.MainJoinChannels { + writer.WriteString(fmt.Sprintf( + ":%s FJOIN %s %s + :%s,%s%s\n", + config.Sid, + channelName, + config.MainUserTs, + config.MainChannelModeOnJoin, + config.Sid, + config.MainUidWithoutSid, + )) + writer.WriteString(fmt.Sprintf( + ":%s MODE %s +%s :%s%s\n", // should probably use IMODE or some new 1205 thing + config.Sid, + channelName, + config.MainChannelModeAfterJoin, + config.Sid, + config.MainUidWithoutSid, + )) + } + writer.WriteString("ENDBURST\n") + writer.Flush() + + for { + msg, err := reader.ReadString('\n') + if err != nil { + fmt.Println("Error reading:", err) + break + } + if msg[len(msg)-1] == '\n' { + msg = msg[:len(msg)-1] + } else { + panic("Message not newline terminated") + } + fmt.Println(msg) + handleMessage(conn, msg, config) + } +} + +func contains(slice []string, item string) bool { + for _, v := range slice { + if v == item { + return true + } + } + return false +} + +func main() { + config, err := loadConfig("config.txt") + if err != nil { + fmt.Println("Error loading config:", err) + return + } + + connect(config) +} |