Various crash fixes, and little cleanups for safety

CHANGELOG.md

@@ -17,6 +17,8 @@ New release of Oragono!
 ### Removed
 
 ### Fixed
+* Fixed crash when using STATUSMSG-like messaging.
+* Fixed crash with gIRC-Go ircmsg library we depend on.
 
 
 ## [0.4.0] - 2016-11-03

DEVELOPING.md

@@ -0,0 +1,10 @@
+# Developing Oragono
+
+Most development happens on the `develop` branch, which is occasionally rebased + merged into `master` when it's not incredibly broken.
+
+The intent is to keep `master` relatively stable.
+
+
+## Fuzzing
+
+Fuzzing can be useful. We don't have testing done inside the IRCd itself, but this fuzzer I've written works alright and has helped shake out various bugs: [irc_fuzz.py](https://gist.github.com/DanielOaks/63ae611039cdf591dfa4) 

irc/client.go

@@ -20,7 +20,7 @@ import (
 const (
 	IDLE_TIMEOUT        = time.Minute + time.Second*30 // how long before a client is considered idle
 	QUIT_TIMEOUT        = time.Minute                  // how long after idle before a client is kicked
-	IdentTimeoutSeconds = 8
+	IdentTimeoutSeconds = 5
 )
 
 var (
@@ -157,7 +157,11 @@ func (client *Client) run() {
 
 		cmd, exists := Commands[msg.Command]
 		if !exists {
+			if len(msg.Command) > 0 {
 				client.Send(nil, client.server.name, ERR_UNKNOWNCOMMAND, client.nick, msg.Command, "Unknown command")
+			} else {
+				client.Send(nil, client.server.name, ERR_UNKNOWNCOMMAND, client.nick, "lastcmd", "No command given")
+			}
 			continue
 		}
 
@@ -463,6 +467,8 @@ func (client *Client) Send(tags *map[string]ircmsg.TagValue, prefix string, comm
 		// try not to fail quietly - especially useful when running tests, as a note to dig deeper
 		// log.Println("Error assembling message:")
 		// spew.Dump(message)
+		// debug.PrintStack()
+
 		message = ircmsg.MakeMessage(nil, client.server.name, ERR_UNKNOWNERROR, "*", "Error assembling message for sending")
 		line, _ := message.Line()
 		client.socket.Write(line)

irc/modes.go

@@ -207,7 +207,7 @@ var (
 func SplitChannelMembershipPrefixes(target string) (prefixes string, name string) {
 	name = target
 	for {
-		if len(name) == 0 || strings.Contains("~&@%+", string(name[0])) {
+		if len(name) > 0 && strings.Contains("~&@%+", string(name[0])) {
 			prefixes += string(name[0])
 			name = name[1:]
 		} else {
@@ -257,7 +257,9 @@ func umodeHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
 	target := server.clients.Get(nickname)
 
 	if err != nil || target == nil {
+		if len(msg.Params[0]) > 0 {
 			client.Send(nil, server.name, ERR_NOSUCHNICK, client.nick, msg.Params[0], "No such nick")
+		}
 		return false
 	}
 

irc/server.go

@@ -354,7 +354,7 @@ func (server *Server) Run() {
 				if isBanned {
 					banMessage := fmt.Sprintf(bannedFromServerBytes, info.Reason)
 					if info.Time != nil {
-						banMessage += fmt.Sprintf(" [%s]", info.Time.Length.String())
+						banMessage += fmt.Sprintf(" [%s]", info.Time.Duration.String())
 					}
 					conn.Conn.Write([]byte(banMessage))
 					conn.Conn.Close()
@@ -698,7 +698,9 @@ func joinHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
 	for i, name := range channels {
 		casefoldedName, err := CasefoldChannel(name)
 		if err != nil {
+			if len(name) > 0 {
 				client.Send(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, name, "No such channel")
+			}
 			continue
 		}
 
@@ -734,7 +736,9 @@ func partHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
 		channel := server.channels.Get(casefoldedChannelName)
 
 		if err != nil || channel == nil {
+			if len(chname) > 0 {
 				client.Send(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, chname, "No such channel")
+			}
 			continue
 		}
 
@@ -748,7 +752,9 @@ func topicHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
 	name, err := CasefoldChannel(msg.Params[0])
 	channel := server.channels.Get(name)
 	if err != nil || channel == nil {
+		if len(msg.Params[0]) > 0 {
 			client.Send(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, msg.Params[0], "No such channel")
+		}
 		return false
 	}
 
@@ -774,6 +780,11 @@ func privmsgHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool
 		prefixes, targetString := SplitChannelMembershipPrefixes(targetString)
 		lowestPrefix := GetLowestChannelModePrefix(prefixes)
 
+		// eh, no need to notify them
+		if len(targetString) < 1 {
+			continue
+		}
+
 		target, err := CasefoldChannel(targetString)
 		if err == nil {
 			channel := server.channels.Get(target)
@@ -786,7 +797,9 @@ func privmsgHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool
 			target, err = CasefoldName(targetString)
 			user := server.clients.Get(target)
 			if err != nil || user == nil {
+				if len(target) > 0 {
 					client.Send(nil, server.name, ERR_NOSUCHNICK, target, "No such nick")
+				}
 				continue
 			}
 			if !user.capabilities[MessageTags] {
@@ -832,6 +845,11 @@ func whoisHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
 		masksString = msg.Params[0]
 	}
 
+	if len(strings.TrimSpace(masksString)) < 1 {
+		client.Send(nil, server.name, ERR_UNKNOWNERROR, client.nick, msg.Command, "No masks given")
+		return false
+	}
+
 	if client.flags[Operator] {
 		masks := strings.Split(masksString, ",")
 		for _, mask := range masks {
@@ -964,7 +982,6 @@ func operHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
 	err = ComparePassword(hash, password)
 
 	if (hash == nil) || (err != nil) {
-		fmt.Println("2", hash)
 		client.Send(nil, server.name, ERR_PASSWDMISMATCH, client.nick, "Password incorrect")
 		return true
 	}
@@ -1392,7 +1409,9 @@ func listHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
 			casefoldedChname, err := CasefoldChannel(chname)
 			channel := server.channels.Get(casefoldedChname)
 			if err != nil || channel == nil || (!client.flags[Operator] && channel.flags[Secret]) {
+				if len(chname) > 0 {
 					client.Send(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, chname, "No such channel")
+				}
 				continue
 			}
 			client.RplList(channel)
@@ -1445,7 +1464,9 @@ func namesHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
 		casefoldedChname, err := CasefoldChannel(chname)
 		channel := server.channels.Get(casefoldedChname)
 		if err != nil || channel == nil {
+			if len(chname) > 0 {
 				client.Send(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, chname, "No such channel")
+			}
 			continue
 		}
 		channel.Names(client)
@@ -1545,13 +1566,17 @@ func whowasHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
 	for _, nickname := range nicknames {
 		results := server.whoWas.Find(nickname, count)
 		if len(results) == 0 {
+			if len(nickname) > 0 {
 				client.Send(nil, server.name, ERR_WASNOSUCHNICK, client.nick, nickname, "There was no such nickname")
+			}
 		} else {
 			for _, whoWas := range results {
 				client.Send(nil, server.name, RPL_WHOWASUSER, client.nick, whoWas.nickname, whoWas.username, whoWas.hostname, "*", whoWas.realname)
 			}
 		}
+		if len(nickname) > 0 {
 			client.Send(nil, server.name, RPL_ENDOFWHOWAS, client.nick, nickname, "End of WHOWAS")
 		}
+	}
 	return false
 }