Initial commit of vague hackery for a go IRCd.

server/config/Makefile

@@ -0,0 +1,17 @@
+# Copyright 2009 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+include $(GOROOT)/src/Make.inc
+
+TARG=irc/server/config
+GOFILES=\
+	config.go\
+	port.go\
+	oper.go\
+	link.go\
+	ban.go\
+	info.go\
+    settings.go\
+
+include $(GOROOT)/src/Make.pkg

server/config/ban.go

@@ -0,0 +1,33 @@
+package config
+
+type cBan interface {
+	Match(string) bool
+	Reason() string
+}
+
+// G-Line etc; 
+type cBanNick struct {
+	NickMask string // nick!ident@host
+	Reason   string
+}
+
+// Z-Line
+type cBanIP struct {
+	Address string // ip (or hostname), plus optional CIDR netmask
+	Reason  string
+	ip		string // parsed into these
+	cidr	int
+}
+
+// CTCP version ban
+type cBanVersion struct {
+	VersionRegex string // regex to match against version reply
+	Reason       string
+}
+
+// Ban server from linking to network
+type cBanServer struct {
+	ServerMask string // matched against name of linked server
+	Reason     string
+}
+

server/config/config.go

@@ -0,0 +1,167 @@
+package config
+
+import (
+	"io"
+	"os"
+	"fmt"
+	"strconv"
+	"scanner"
+)
+
+type Config struct {
+	fn string
+	scan *scanner.Scanner
+
+	// Ports we listen on.
+	Ports map[int]*cPort
+	// People with teh p0wer.
+	Opers map[string]*cOper
+	// Servers we link to on the network.
+	Links map[string]*cLink
+	// Servers/nickmasks/IPs that are unwanted.
+	Bans []*cBan
+
+	// Server info (name, admins, etc.)
+	Info *cInfo
+
+	// Server settings
+	Settings *cSettings
+
+	// Parse errors
+	Errors []os.Error
+}
+
+type configMap  map[string]func(*Config)
+type keywordMap map[string]func(*Config, interface{})
+
+var configKeywords = configMap{
+	"port": (*Config).parsePort,
+//	"oper": (*Config).parseOper,
+//	"link": (*Config).parseLink,
+//	"ban":  (*Config).parseBan,
+//	"info": (*Config).parseInfo,
+//	"set":  (*Config).parseSettings,
+}
+
+func LoadConfig(filename string) *Config {
+	conf := &Config{fn: filename}
+	conf.initialise()
+	if fh, err := os.Open(conf.fn, os.O_RDONLY, 0644); err == nil {
+		conf.Parse(fh)
+		fh.Close()
+	} else {
+		conf.Errors = append(conf.Errors, err)
+	}
+	return conf
+}
+
+func (conf *Config) initialise() {
+	conf.Ports = make(map[int]*cPort)
+	conf.Opers = make(map[string]*cOper)
+	conf.Links = make(map[string]*cLink)
+	conf.Bans = make([]*cBan, 0)
+	conf.Info = &cInfo{}
+	conf.Settings = &cSettings{}
+	conf.Errors = make([]os.Error, 0)
+}
+
+func (conf *Config) Rehash() {
+	neu := LoadConfig(conf.fn)
+	if len(neu.Errors) > 0 {
+		conf.Errors = neu.Errors
+	} else {
+		conf = neu
+	}
+}
+
+func (conf *Config) Parse(io io.Reader) {
+	s := &scanner.Scanner{}
+	s.Init(io)
+	s.Filename = conf.fn
+	conf.scan = s
+	tok, text := conf.next()
+	for tok != scanner.EOF {
+		// This external loop should only parse Config things
+		if f, ok := configKeywords[text]; ok {
+			f(conf)
+		} else {
+			conf.parseError("Invalid top-level keyword '%s'", text)
+		}
+		fmt.Printf("Token: '%s', type %s\n", s.TokenText(), scanner.TokenString(tok))
+		tok, text = conf.next()
+	}
+}
+
+func (conf *Config) parseKwBlock(dst interface{}, bt string, kw keywordMap) {
+	if ok := conf.expect("{"); !ok {
+		conf.parseError("Expected %s configuration block.", bt)
+		return
+	}
+	tok, text := conf.next()
+	for tok != scanner.EOF {
+		if f, ok := kw[text]; ok {
+			if ok = conf.expect("="); ok {
+				f(conf, dst)
+			}
+		} else if text == "}" {
+			break
+		} else {
+			conf.parseError("Invalid %s keyword '%s'", bt, text)
+		}
+		tok, text = conf.next()
+	}
+}
+
+var booleans = map[string]bool {
+	"true": true,
+	"yes": true,
+	"on": true,
+	"1": true,
+	"false": false,
+	"no": false,
+	"off": false,
+	"0": false,
+}
+
+func (conf *Config) expectBool() (bool, bool) {
+	tok, text := conf.next()
+	if val, ok := booleans[text]; tok == scanner.Ident && ok {
+		return val, ok
+	}
+	conf.parseError("Expected boolean, got '%s'", text)
+	return false, false
+}
+
+func (conf *Config) expectInt() (int, bool) {
+	tok, text := conf.next()
+	num, err := strconv.Atoi(text)
+	if tok != scanner.Int || err != nil {
+		conf.parseError("Expected integer, got '%s'", text)
+		return 0, false
+	}
+	return num, true
+}
+
+func (conf *Config) expect(str string) bool {
+	_, text := conf.next()
+	if text != str {
+		conf.parseError("Expected '%s', got '%s'", str, text)
+		return false
+	}
+	return true
+}
+
+func (conf *Config) next() (int, string) {
+	tok := conf.scan.Scan()
+	text := conf.scan.TokenText()
+	if tok == scanner.String {
+		// drop "quotes" -> quotes
+		text = text[1:len(text)-1]
+	}
+	return tok, text
+}
+
+func (conf *Config) parseError(err string, args ...interface{}) {
+	err = conf.scan.Pos().String() + ": " + err
+	conf.Errors = append(conf.Errors, os.NewError(fmt.Sprintf(err, args...)))
+}

server/config/info.go

@@ -0,0 +1,8 @@
+package config
+
+type cInfo struct {
+	Name, Network, Info, MOTDFile string
+	Admins []string
+	Numeric int
+}
+

server/config/link.go

@@ -0,0 +1,12 @@
+package config
+
+type cLink struct {
+	Server      string // Server name for link
+	Address     string // {ip,ip6,host}:port
+	ReceivePass string // Password when server connects to us 
+	ConnectPass string // Password when we connect to server
+
+	// Do we use tls.Dial? or compression (no)? Do we auto-connect on start?
+	SSL, Zip, Auto bool
+}
+

server/config/oper.go

@@ -0,0 +1,16 @@
+package config
+
+type cOper struct {
+	Username, Password string
+	HostMask []string
+
+	// Permissions for oper
+	CanKill, CanBan, CanNick, CanLink  bool
+}
+
+var cOperDefaults = &cOper{
+	HostMask: []string{"*@*"},
+	CanKill: true, CanBan: true,
+	CanNick: false, CanLink: false,
+}
+

server/config/port.go

@@ -0,0 +1,86 @@
+package config
+
+import (
+	"fmt"
+	"strings"
+	"scanner"
+)
+
+type cPort struct {
+	Port     int
+	BindIP, Family, Class string
+
+	// Is port a tls.Listener? Does it support compression (no)?
+	SSL, Zip bool
+
+	// address == "<BindIP>:<Port>"
+	address	 string
+}
+
+var portKeywords = keywordMap{
+//	"bind_ip": (*Config).parsePortBindIP,
+//	"family": (*Config).parsePortFamily,
+	"class": (*Config).parsePortClass,
+	"ssl": (*Config).parsePortSSL,
+//	"zip": (*Config).parsePortZip,
+}
+
+var cPortDefaults = cPort{
+	BindIP: "", Family: "tcp", Class: "client",
+	SSL: false, Zip: false,
+}
+
+func defaultPort() *cPort {
+	p := cPortDefaults
+	return &p
+}
+
+func (p *cPort) String() string {
+    str := []string{fmt.Sprintf("port %d {", p.Port)}
+	if p.BindIP != "" {
+		str = append(str, "\tbind_ip = " + p.BindIP)
+	}
+	str = append(str,
+		fmt.Sprintf("\tfamily = \"%s\"",p.Family),
+		fmt.Sprintf("\tclass  = \"%s\"", p.Class),
+		fmt.Sprintf("\tssl    = %t", p.SSL),
+		fmt.Sprintf("\tzip    = %t", p.Zip),
+		"}",
+	)
+	return strings.Join(str, "\n")
+}
+
+func (conf *Config) parsePort() {
+	port := defaultPort()
+	portnum, ok := conf.expectInt()
+	if !ok || portnum > 65535 || portnum < 1024 {
+		conf.parseError("Invalid port '%s'", portnum)
+		port = nil
+	} else {
+		port.Port = portnum
+		conf.Ports[portnum] = port
+	}
+	if conf.scan.Peek() != '\n' {
+		conf.parseKwBlock(port, "port", portKeywords)
+	}
+	fmt.Println(port.String())
+}
+
+func (conf *Config) parsePortClass(pi interface{}) {
+	port := pi.(*cPort)
+	tok, text := conf.next()
+	if tok == scanner.String && (text == "server" || text == "client") {
+		port.Class = text
+	} else {
+		conf.parseError(
+			"Port class must be \"server\" or \"client\", got '%s'", text)
+	}
+}
+
+func (conf *Config) parsePortSSL(pi interface{}) {
+	port := pi.(*cPort)
+	if ssl, ok := conf.expectBool(); ok {
+		port.SSL = ssl
+	}
+}
+

server/config/settings.go

@@ -0,0 +1,8 @@
+package config
+
+type cSettings struct {
+	SSLKey, SSLCert, SSLCACert string
+	MaxChans, MaxConnsPerIP int
+	LogFile string
+}
+