hid: first round of mixed fixes and cleanups

hid/main.go

@@ -16,55 +16,101 @@
 // hid is a straight-forward port of kike IRCd from C.
 package main
 
-/*
+import (
+	"bufio"
+	"crypto/sha256"
+	"crypto/tls"
+	"encoding/hex"
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"os"
+	"os/signal"
+	"os/user"
+	"path/filepath"
+	"regexp"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+)
 
-// ANSI terminal formatting, would be better if we had isatty() available
-func tf(text string, ansi string) string {
-	return "\x1b[0;" + ansi + "m" + text + "\x1b[0m"
-}
+var debugMode = false
 
-func logErrorf(format string, args ...interface{}) {
-	fmt.Fprintf(os.Stderr, tf("error: "+format+"\n", "1;31"), args...)
-}
+const (
+	projectName = "hid"
+	// TODO: Consider using the same version number for all subprojects.
+	projectVersion = "0"
+)
 
-func logFatalf(format string, args ...interface{}) {
-	fmt.Fprintf(os.Stderr, tf("fatal: "+format+"\n", "1;31"), args...)
-	os.Exit(1)
-}
+// --- Utilities ---------------------------------------------------------------
 
-func logFatal(object interface{}) {
-	logFatalf("%s", object)
-}
-
-func getHome() (home string) {
-	if u, _ := user.Current(); u != nil {
-		home = u.HomeDir
-	} else {
-		home = os.Getenv("HOME")
+// Split a string by a set of UTF-8 delimiters, optionally ignoring empty items.
+func splitString(s, delims string, ignoreEmpty bool) (result []string) {
+	for {
+		end := strings.IndexAny(s, delims)
+		if end < 0 {
+			break
+		}
+		if !ignoreEmpty || end != 0 {
+			result = append(result, s[:end])
+		}
+		s = s[end+1:]
+	}
+	if !ignoreEmpty || s != "" {
+		result = append(result, s)
 	}
 	return
 }
 
-// Only handling the simple case as that's what one mostly wants.
-// TODO(p): Handle the generic case as well.
-func expandTilde(path string) string {
-	if strings.HasPrefix(path, "~/") {
-		return getHome() + path[1:]
+func findTildeHome(username string) string {
+	if username != "" {
+		if u, _ := user.Lookup(username); u != nil {
+			return u.HomeDir
+		}
+	} else if u, _ := user.Current(); u != nil {
+		return u.HomeDir
+	} else if v, ok := os.LookupEnv("HOME"); ok {
+		return v
 	}
-	return path
+	return "~" + username
 }
 
-func getXdgHomeDir(name, def string) string {
+// Tries to expand the tilde in paths, leaving it as-is on error.
+func expandTilde(path string) string {
+	if path[0] != '~' {
+		return path
+	}
+
+	var n int
+	for n = 0; n < len(path); n++ {
+		if path[n] == '/' {
+			break
+		}
+	}
+	return findTildeHome(path[1:n]) + path[n:]
+}
+
+func getXDGHomeDir(name, def string) string {
 	env := os.Getenv(name)
 	if env != "" && env[0] == '/' {
 		return env
 	}
-	return filepath.Join(getHome(), def)
+
+	home := ""
+	if v, ok := os.LookupEnv("HOME"); ok {
+		home = v
+	} else if u, _ := user.Current(); u != nil {
+		home = u.HomeDir
+	}
+	return filepath.Join(home, def)
 }
 
-// Retrieve all XDG base directories for configuration files
-func getXdgConfigDirs() (result []string) {
-	home := getXdgHomeDir("XDG_CONFIG_HOME", ".config")
+// Retrieve all XDG base directories for configuration files.
+func getXDGConfigDirs() (result []string) {
+	home := getXDGHomeDir("XDG_CONFIG_HOME", ".config")
 	if home != "" {
 		result = append(result, home)
 	}
@@ -80,56 +126,6 @@ func getXdgConfigDirs() (result []string) {
 	return
 }
 
-// Read a configuration file with the given basename w/o extension
-func readConfigFile(name string, output interface{}) error {
-	var suffix = filepath.Join(projectName, name+".json")
-	for _, path := range getXdgConfigDirs() {
-		full := filepath.Join(path, suffix)
-		file, err := os.Open(full)
-		if err != nil {
-			if !os.IsNotExist(err) {
-				return err
-			}
-			continue
-		}
-		defer file.Close()
-
-		decoder := json.NewDecoder(file)
-		err = decoder.Decode(output)
-		if err != nil {
-			return fmt.Errorf("%s: %s", full, err)
-		}
-		return nil
-	}
-	return errors.New("configuration file not found")
-}
-
-*/
-
-import (
-	"bufio"
-	"crypto/sha256"
-	"crypto/tls"
-	"encoding/hex"
-	"flag"
-	"fmt"
-	"io"
-	"log"
-	"net"
-	"os"
-	"os/signal"
-	"path/filepath"
-	"regexp"
-	"strconv"
-	"strings"
-	"syscall"
-	"time"
-)
-
-var debugMode = false
-
-// --- Utilities ---------------------------------------------------------------
-
 //
 // Trivial SSL/TLS autodetection. The first block of data returned by Recvfrom
 // must be at least three octets long for this to work reliably, but that should
@@ -173,6 +169,35 @@ var config = []struct {
 	{"bind", []rune(":6667"), "Address of the IRC server"},
 }
 
+/*
+
+// Read a configuration file with the given basename w/o extension.
+func readConfigFile(name string, output interface{}) error {
+	var suffix = filepath.Join(projectName, name+".json")
+	for _, path := range getXDGConfigDirs() {
+		full := filepath.Join(path, suffix)
+		file, err := os.Open(full)
+		if err != nil {
+			if !os.IsNotExist(err) {
+				return err
+			}
+			continue
+		}
+		defer file.Close()
+
+		// TODO: We don't want to use JSON.
+		decoder := json.NewDecoder(file)
+		err = decoder.Decode(output)
+		if err != nil {
+			return fmt.Errorf("%s: %s", full, err)
+		}
+		return nil
+	}
+	return errors.New("configuration file not found")
+}
+
+*/
+
 // --- Rate limiter ------------------------------------------------------------
 
 type floodDetector struct {
@@ -231,21 +256,40 @@ func ircToLower(c byte) byte {
 	return c
 }
 
-// TODO: To support ALL CAPS initialization of maps, perhaps we should use
-// ircToUpper instead.
-// FIXME: This doesn't follow the meaning of strxfrm and perhaps should be
-// renamed to ircNormalize.
-func ircStrxfrm(ident string) string {
+func ircToUpper(c byte) byte {
+	switch c {
+	case '{':
+		return '['
+	case '}':
+		return ']'
+	case '|':
+		return '\\'
+	case '^':
+		return '~'
+	}
+	if c >= 'a' && c <= 'z' {
+		return c - ('a' - 'A')
+	}
+	return c
+}
+
+// Convert identifier to a canonical form for case-insensitive comparisons.
+// ircToUpper is used so that statically initialized maps can be in uppercase.
+func ircToCanon(ident string) string {
 	var canon []byte
 	for _, c := range []byte(ident) {
-		canon = append(canon, ircToLower(c))
+		canon = append(canon, ircToUpper(c))
 	}
 	return string(canon)
 }
 
+func ircEqual(s1, s2 string) bool {
+	return ircToCanon(s1) == ircToCanon(s2)
+}
+
 func ircFnmatch(pattern string, s string) bool {
-	pattern, s = ircStrxfrm(pattern), ircStrxfrm(s)
-	// FIXME: This should not support [] ranges and handle / specially.
+	pattern, s = ircToCanon(pattern), ircToCanon(s)
+	// FIXME: This should not support [] ranges and handle '/' specially.
 	// We could translate the pattern to a regular expression.
 	matched, _ := filepath.Match(pattern, s)
 	return matched
@@ -331,8 +375,8 @@ type client struct {
 	transport net.Conn       // underlying connection
 	tls       *tls.Conn      // TLS, if detected
 	conn      connCloseWrite // high-level connection
-	inQ       []byte         // unprocessed input
-	outQ      []byte         // unprocessed output
+	recvQ     []byte         // unprocessed input
+	sendQ     []byte         // unprocessed output
 	reading   bool           // whether a reading goroutine is running
 	writing   bool           // whether a writing goroutine is running
 	closing   bool           // whether we're closing the connection
@@ -459,10 +503,8 @@ type writeEvent struct {
 var (
 	started int64 // when has the server been started
 
-	users       map[string]*client  // maps nicknames to clients
-	channels    map[string]*channel // maps channel names to data
-	handlers    map[string]bool     // TODO message handlers
-	capHandlers map[string]bool     // TODO CAP message handlers
+	users    map[string]*client  // maps nicknames to clients
+	channels map[string]*channel // maps channel names to data
 
 	whowas map[string]*whowasInfo // WHOWAS registry
 
@@ -481,38 +523,38 @@ var (
 	writes   = make(chan writeEvent)
 	timeouts = make(chan *client)
 
-	tlsConf  *tls.Config
-	clients  = make(map[*client]bool)
-	listener net.Listener
-	// TODO: quitting, quitTimer as they are named in kike?
-	inShutdown    bool
-	shutdownTimer <-chan time.Time
+	tlsConf   *tls.Config
+	clients   = make(map[*client]bool)
+	listener  net.Listener
+	quitting  bool
+	quitTimer <-chan time.Time
 )
 
 // Forcefully tear down all connections.
-func forceShutdown(reason string) {
-	if !inShutdown {
-		log.Fatalln("forceShutdown called without initiateShutdown")
+func forceQuit(reason string) {
+	if !quitting {
+		log.Fatalln("forceQuit called without initiateQuit")
 	}
 
 	log.Printf("forced shutdown (%s)\n", reason)
 	for c := range clients {
-		c.destroy("TODO")
+		// initiateQuit has already unregistered the client.
+		c.kill("Shutting down")
 	}
 }
 
 // Initiate a clean shutdown of the whole daemon.
-func initiateShutdown() {
+func initiateQuit() {
 	log.Println("shutting down")
 	if err := listener.Close(); err != nil {
 		log.Println(err)
 	}
 	for c := range clients {
-		c.closeLink("TODO")
+		c.closeLink("Shutting down")
 	}
 
-	shutdownTimer = time.After(5 * time.Second)
-	inShutdown = true
+	quitTimer = time.After(5 * time.Second)
+	quitting = true
 }
 
 // TODO: ircChannelCreate
@@ -538,32 +580,31 @@ func ircSendToRoommates(c *client, message string) {
 
 // --- Clients (continued) -----------------------------------------------------
 
-// TODO: Perhaps we should append to *[]byte for performance.
-func clientModeToString(m uint, mode *string) {
+func clientModeToString(m uint, mode *[]byte) {
 	if 0 != m&ircUserModeInvisible {
-		*mode += "i"
+		*mode = append(*mode, 'i')
 	}
 	if 0 != m&ircUserModeRxWallops {
-		*mode += "w"
+		*mode = append(*mode, 'w')
 	}
 	if 0 != m&ircUserModeRestricted {
-		*mode += "r"
+		*mode = append(*mode, 'r')
 	}
 	if 0 != m&ircUserModeOperator {
-		*mode += "o"
+		*mode = append(*mode, 'o')
 	}
 	if 0 != m&ircUserModeRxServerNotices {
-		*mode += "s"
+		*mode = append(*mode, 's')
 	}
 }
 
 func (c *client) getMode() string {
-	mode := ""
+	var mode []byte
 	if c.awayMessage != "" {
-		mode += "a"
+		mode = append(mode, 'a')
 	}
 	clientModeToString(c.mode, &mode)
-	return mode
+	return string(mode)
 }
 
 func (c *client) send(line string) {
@@ -571,14 +612,13 @@ func (c *client) send(line string) {
 		return
 	}
 
-	// TODO: Rename inQ and outQ to recvQ and sendQ as they are usually named.
-	oldOutQ := len(c.outQ)
+	oldSendQLen := len(c.sendQ)
 
 	// So far there's only one message tag we use, so we can do it simple;
 	// note that a 1024-character limit applies to messages with tags on.
 	if 0 != c.capsEnabled&ircCapServerTime {
-		c.outQ = time.Now().UTC().
-			AppendFormat(c.outQ, "@time=2006-01-02T15:04:05.000Z ")
+		c.sendQ = time.Now().UTC().
+			AppendFormat(c.sendQ, "@time=2006-01-02T15:04:05.000Z ")
 	}
 
 	bytes := []byte(line)
@@ -587,13 +627,13 @@ func (c *client) send(line string) {
 	}
 
 	// TODO: Kill the connection above some "SendQ" threshold (careful!)
-	c.outQ = append(c.outQ, bytes...)
-	c.outQ = append(c.outQ, "\r\n"...)
-	c.flushOutQ()
+	c.sendQ = append(c.sendQ, bytes...)
+	c.sendQ = append(c.sendQ, "\r\n"...)
+	c.flushSendQ()
 
 	// Technically we haven't sent it yet but that's a minor detail
 	c.nSentMessages++
-	c.sentBytes += len(c.outQ) - oldOutQ
+	c.sentBytes += len(c.sendQ) - oldSendQLen
 }
 
 func (c *client) sendf(format string, a ...interface{}) {
@@ -604,7 +644,14 @@ func (c *client) addToWhowas() {
 	// Only keeping one entry for each nickname.
 	// TODO: Make sure this list doesn't get too long, for example by
 	// putting them in a linked list ordered by time.
-	whowas[ircStrxfrm(c.nickname)] = newWhowasInfo(c)
+	whowas[ircToCanon(c.nickname)] = newWhowasInfo(c)
+}
+
+func (c *client) nicknameOrStar() string {
+	if c.nickname == "" {
+		return "*"
+	}
+	return c.nickname
 }
 
 func (c *client) unregister(reason string) {
@@ -622,14 +669,13 @@ func (c *client) unregister(reason string) {
 	}
 
 	c.addToWhowas()
-	delete(users, ircStrxfrm(c.nickname))
+	delete(users, ircToCanon(c.nickname))
 	c.nickname = ""
 	c.registered = false
 }
 
-// TODO: Rename to kill.
 // Close the connection and forget about the client.
-func (c *client) destroy(reason string) {
+func (c *client) kill(reason string) {
 	if reason == "" {
 		reason = "Client exited"
 	}
@@ -661,25 +707,20 @@ func (c *client) closeLink(reason string) {
 	// We also want to avoid accidentally writing to the socket before
 	// address resolution has finished.
 	if c.conn == nil {
-		c.destroy(reason)
+		c.kill(reason)
 		return
 	}
 	if c.closing {
 		return
 	}
 
-	nickname := c.nickname
-	if nickname == "" {
-		nickname = "*"
-	}
-
 	// We push an "ERROR" message to the write buffer and let the writer send
 	// it, with some arbitrary timeout. The "closing" state makes sure
 	// that a/ we ignore any successive messages, and b/ that the connection
 	// is killed after the write buffer is transferred and emptied.
 	// (Since we send this message, we don't need to call CloseWrite here.)
 	c.sendf("ERROR :Closing link: %s[%s] (%s)",
-		nickname, c.hostname /* TODO host IP? */, reason)
+		c.nicknameOrStar(), c.hostname /* TODO host IP? */, reason)
 	c.closing = true
 
 	c.unregister(reason)
@@ -720,12 +761,7 @@ func (c *client) getTLSCertFingerprint() string {
 
 // XXX: ap doesn't really need to be a slice.
 func (c *client) makeReply(id int, ap []interface{}) string {
-	nickname := c.nickname
-	if nickname == "" {
-		nickname = "*"
-	}
-
-	s := fmt.Sprintf(":%s %03d %s ", serverName, id, nickname)
+	s := fmt.Sprintf(":%s %03d %s ", serverName, id, c.nicknameOrStar())
 	a := fmt.Sprintf(defaultReplies[id], ap...)
 	return s + a
 }
@@ -809,7 +845,7 @@ func isThisMe(target string) bool {
 	if ircFnmatch(target, serverName) {
 		return true
 	}
-	_, ok := users[ircStrxfrm(target)]
+	_, ok := users[ircToCanon(target)]
 	return ok
 }
 
@@ -821,21 +857,20 @@ func (c *client) sendISUPPORT() {
 }
 
 func (c *client) tryFinishRegistration() {
-	// TODO: Check if the realname is really required.
-	if c.nickname == "" || c.username == "" || c.realname == "" {
+	if c.registered || c.capNegotiating {
 		return
 	}
-	if c.registered || c.capNegotiating {
+	if c.nickname == "" || c.username == "" {
 		return
 	}
 
 	c.registered = true
 	c.sendReply(RPL_WELCOME, c.nickname, c.username, c.hostname)
 
-	c.sendReply(RPL_YOURHOST, serverName, "TODO version")
+	c.sendReply(RPL_YOURHOST, serverName, projectVersion)
 	// The purpose of this message eludes me.
 	c.sendReply(RPL_CREATED, time.Unix(started, 0).Format("Mon, 02 Jan 2006"))
-	c.sendReply(RPL_MYINFO, serverName, "TODO version",
+	c.sendReply(RPL_MYINFO, serverName, projectVersion,
 		ircSupportedUserModes, ircSupportedChanModes)
 
 	c.sendISUPPORT()
@@ -852,7 +887,7 @@ func (c *client) tryFinishRegistration() {
 			serverName, c.nickname, c.tlsCertFingerprint)
 	}
 
-	delete(whowas, ircStrxfrm(c.nickname))
+	delete(whowas, ircToCanon(c.nickname))
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -957,8 +992,6 @@ func (c *client) handleCAPEND(a *ircCapArgs) {
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
-// TODO: Beware of case sensitivity, probably need to index it by ircStrxfrm,
-// which should arguably be named ircToLower and ircToUpper or something.
 var ircCapHandlers = map[string]func(*client, *ircCapArgs){
 	"LS":   (*client).handleCAPLS,
 	"LIST": (*client).handleCAPLIST,
@@ -976,14 +1009,8 @@ func ircHandleCAP(msg *message, c *client) {
 		return
 	}
 
-	// TODO: This really does seem to warrant a method.
-	nickname := c.nickname
-	if nickname == "" {
-		nickname = "*"
-	}
-
 	args := &ircCapArgs{
-		target:     nickname,
+		target:     c.nicknameOrStar(),
 		subcommand: msg.params[0],
 		fullParams: "",
 		params:     []string{},
@@ -991,12 +1018,10 @@ func ircHandleCAP(msg *message, c *client) {
 
 	if len(msg.params) > 1 {
 		args.fullParams = msg.params[1]
-		// TODO: ignore_empty, likely create SplitSkipEmpty
-		args.params = strings.Split(args.fullParams, " ")
+		args.params = splitString(args.fullParams, " ", true)
 	}
 
-	// FIXME: We should ASCII ToUpper the subcommand.
-	if fn, ok := ircCapHandlers[ircStrxfrm(args.subcommand)]; !ok {
+	if fn, ok := ircCapHandlers[ircToCanon(args.subcommand)]; !ok {
 		c.sendReply(ERR_INVALIDCAPCMD, args.subcommand,
 			"Invalid CAP subcommand")
 	} else {
@@ -1026,8 +1051,8 @@ func ircHandleNICK(msg *message, c *client) {
 		return
 	}
 
-	nicknameNormalized := ircStrxfrm(nickname)
-	if client, ok := users[nicknameNormalized]; ok && client != c {
+	nicknameCanon := ircToCanon(nickname)
+	if client, ok := users[nicknameCanon]; ok && client != c {
 		c.sendReply(ERR_NICKNAMEINUSE, nickname)
 		return
 	}
@@ -1043,11 +1068,11 @@ func ircHandleNICK(msg *message, c *client) {
 
 	// Release the old nickname and allocate a new one.
 	if c.nickname != "" {
-		delete(users, ircStrxfrm(c.nickname))
+		delete(users, ircToCanon(c.nickname))
 	}
 
 	c.nickname = nickname
-	users[nicknameNormalized] = c
+	users[nicknameCanon] = c
 
 	c.tryFinishRegistration()
 }
@@ -1064,7 +1089,7 @@ func ircHandleUSER(msg *message, c *client) {
 
 	username, mode, realname := msg.params[0], msg.params[1], msg.params[3]
 
-	// Unfortunately the protocol doesn't give us any means of rejecting it
+	// Unfortunately, the protocol doesn't give us any means of rejecting it.
 	if !ircIsValidUsername(username) {
 		username = "*"
 	}
@@ -1091,7 +1116,30 @@ func ircHandleUSERHOST(msg *message, c *client) {
 		return
 	}
 
-	// TODO
+	var reply []byte
+	for i := 0; i < 5 && i < len(msg.params); i++ {
+		nick := msg.params[i]
+		target := users[ircToCanon(nick)]
+		if target == nil {
+			continue
+		}
+		if i != 0 {
+			reply = append(reply, ' ')
+		}
+
+		reply = append(reply, nick...)
+		if 0 != target.mode&ircUserModeOperator {
+			reply = append(reply, '*')
+		}
+
+		if target.awayMessage != "" {
+			reply = append(reply, "=-"...)
+		} else {
+			reply = append(reply, "=+"...)
+		}
+		reply = append(reply, (target.username + "@" + target.hostname)...)
+	}
+	c.sendReply(RPL_USERHOST, string(reply))
 }
 
 func ircHandleLUSERS(msg *message, c *client) {
@@ -1162,8 +1210,8 @@ func ircHandleVERSION(msg *message, c *client) {
 		postVersion = 1
 	}
 
-	c.sendReply(RPL_VERSION, "TODO version", postVersion, serverName,
-		"TODO program name"+" "+"TODO version")
+	c.sendReply(RPL_VERSION, projectVersion, postVersion, serverName,
+		projectName+" "+projectVersion)
 	c.sendISUPPORT()
 }
 
@@ -1199,13 +1247,13 @@ func ircHandleMODE(msg *message, c *client) {
 
 	// TODO
 	target := msg.params[0]
-	client := users[ircStrxfrm(target)]
-	ch := users[ircStrxfrm(target)]
+	client := users[ircToCanon(target)]
+	ch := users[ircToCanon(target)]
 
 	if client != nil {
-		// TODO: Think about strcmp.
-		//if ircStrcmp(target, c.nickname) != 0 {
-		//}
+		// TODO
+		if ircEqual(target, c.nickname) {
+		}
 	} else if ch != nil {
 		// TODO
 	}
@@ -1223,11 +1271,11 @@ func ircHandleUserMessage(msg *message, c *client,
 	}
 
 	target, text := msg.params[0], msg.params[1]
-	if client, ok := users[ircStrxfrm(target)]; ok {
+	if client, ok := users[ircToCanon(target)]; ok {
 		// TODO
 		_ = client
 		_ = text
-	} else if ch, ok := channels[ircStrxfrm(target)]; ok {
+	} else if ch, ok := channels[ircToCanon(target)]; ok {
 		// TODO
 		_ = ch
 	} else {
@@ -1254,7 +1302,7 @@ func (c *client) onPrepared(host string, isTLS bool) {
 	c.hostname = host
 	c.address = net.JoinHostPort(host, c.port)
 
-	// TODO: If we've tried to send any data before now, we need to flushOutQ.
+	// TODO: If we've tried to send any data before now, we need to flushSendQ.
 	go read(c)
 	c.reading = true
 }
@@ -1266,16 +1314,16 @@ func (c *client) onRead(data []byte, readErr error) {
 		return
 	}
 
-	c.inQ = append(c.inQ, data...)
+	c.recvQ = append(c.recvQ, data...)
 	for {
 		// XXX: This accepts even simple LF newlines, even though they're not
 		// really allowed by the protocol.
-		advance, token, _ := bufio.ScanLines(c.inQ, false /* atEOF */)
+		advance, token, _ := bufio.ScanLines(c.recvQ, false /* atEOF */)
 		if advance == 0 {
 			break
 		}
 
-		c.inQ = c.inQ[advance:]
+		c.recvQ = c.recvQ[advance:]
 		line := string(token)
 		log.Printf("-> %s\n", line)
 
@@ -1298,18 +1346,18 @@ func (c *client) onRead(data []byte, readErr error) {
 
 		if readErr != io.EOF {
 			log.Println(readErr)
-			c.destroy("TODO")
+			c.kill(readErr.Error())
 		} else if c.closing {
 			// Disregarding whether a clean shutdown has happened or not.
 			log.Println("client finished shutdown")
-			c.destroy("TODO")
+			c.kill("TODO")
 		} else {
 			log.Println("client EOF")
 			c.closeLink("")
 		}
-	} else if len(c.inQ) > 8192 {
-		log.Println("client inQ overrun")
-		c.closeLink("inQ overrun")
+	} else if len(c.recvQ) > 8192 {
+		log.Println("client recvQ overrun")
+		c.closeLink("recvQ overrun")
 
 		// tls.Conn doesn't have the CloseRead method (and it needs to be able
 		// to read from the TCP connection even for writes, so there isn't much
@@ -1319,29 +1367,29 @@ func (c *client) onRead(data []byte, readErr error) {
 	}
 }
 
-// Spawn a goroutine to flush the outQ if possible and necessary.
-func (c *client) flushOutQ() {
+// Spawn a goroutine to flush the sendQ if possible and necessary.
+func (c *client) flushSendQ() {
 	if !c.writing && c.conn != nil {
-		go write(c, c.outQ)
+		go write(c, c.sendQ)
 		c.writing = true
 	}
 }
 
 // Handle the results from trying to write to the client connection.
 func (c *client) onWrite(written int, writeErr error) {
-	c.outQ = c.outQ[written:]
+	c.sendQ = c.sendQ[written:]
 	c.writing = false
 
 	if writeErr != nil {
 		log.Println(writeErr)
-		c.destroy("TODO")
-	} else if len(c.outQ) > 0 {
-		c.flushOutQ()
+		c.kill(writeErr.Error())
+	} else if len(c.sendQ) > 0 {
+		c.flushSendQ()
 	} else if c.closing {
 		if c.reading {
 			c.conn.CloseWrite()
 		} else {
-			c.destroy("TODO")
+			c.kill("TODO")
 		}
 	}
 }
@@ -1419,7 +1467,7 @@ func read(client *client) {
 	}
 }
 
-// Flush outQ, which is passed by parameter so that there are no data races.
+// Flush sendQ, which is passed by parameter so that there are no data races.
 func write(client *client, data []byte) {
 	// We just write as much as we can, the main goroutine does the looping.
 	n, err := client.conn.Write(data)
@@ -1431,14 +1479,14 @@ func write(client *client, data []byte) {
 func processOneEvent() {
 	select {
 	case <-sigs:
-		if inShutdown {
-			forceShutdown("requested by user")
+		if quitting {
+			forceQuit("requested by user")
 		} else {
-			initiateShutdown()
+			initiateQuit()
 		}
 
-	case <-shutdownTimer:
-		forceShutdown("timeout")
+	case <-quitTimer:
+		forceQuit("timeout")
 
 	case conn := <-conns:
 		log.Println("accepted client connection")
@@ -1480,7 +1528,7 @@ func processOneEvent() {
 	case c := <-timeouts:
 		if _, ok := clients[c]; ok {
 			log.Println("client timeouted")
-			c.destroy("TODO")
+			c.kill("TODO")
 		}
 	}
 }
@@ -1490,14 +1538,12 @@ func main() {
 	version := flag.Bool("version", false, "show version and exit")
 	flag.Parse()
 
-	// TODO: Consider using the same version number for all subprojects.
 	if *version {
-		fmt.Printf("%s %s\n", "hid", "0")
+		fmt.Printf("%s %s\n", projectName, projectVersion)
 		return
 	}
 
-	// TODO: Configuration--create an INI parser, probably;
-	//   lift XDG_CONFIG_HOME from gitlab-notifier.
+	// TODO: Configuration--create an INI parser, probably.
 	if len(flag.Args()) != 3 {
 		log.Fatalf("usage: %s KEY CERT ADDRESS\n", os.Args[0])
 	}
@@ -1520,7 +1566,7 @@ func main() {
 	go accept(listener)
 	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
 
-	for !inShutdown || len(clients) > 0 {
+	for !quitting || len(clients) > 0 {
 		processOneEvent()
 	}
 }