Send and handle NICK+USER commands for user registration (RFC 1459).

This patch enables ngIRCd to deal with NICK and USER commands following
RFC 1459 to register new clients, and to send these commands instead of one
full NICK command as specified in RFC 2813 on connections that are in RFC
1459 compatibility mode.

Can be useful for e. g. IRC services that simulate a RFC 1459 server.

src/ngircd/irc-login.c

@@ -38,12 +38,25 @@
 #include "irc-login.h"
 
 
+typedef struct _INTRO_INFO {
+	char *nick;		/* Nick name */
+	int hopcount;		/* Hop count */
+	char *user;		/* User name */
+	char *host;		/* Host name */
+	CLIENT *server;		/* Server the client is connected to */
+	char *mode;		/* User modes */
+	char *name;		/* Real name */
+} INTRO_INFO;
+
+
 static bool Hello_User PARAMS(( CLIENT *Client ));
 static void Kill_Nick PARAMS(( char *Nick, char *Reason ));
-static void Introduce_Client PARAMS(( CLIENT *From, const char *Nick,
+static void Introduce_Client PARAMS((CLIENT *From, char *Nick,
-				     const int HopCount, const char *User,
+				     const int HopCount, char *User,
-				     const char *Host, const int Token,
+				     char *Host, CLIENT *Server,
-				     const char *Mode, const char *Name ));
+				     char *Mode, char *Name ));
+static void cb_introduceClient PARAMS((CLIENT *Client, CLIENT *Prefix,
+				       void *i));
 
 
 /**
@@ -371,15 +384,25 @@ IRC_NICK( CLIENT *Client, REQUEST *Req )
 			return CONNECTED;
 		}
 
-		modes = Client_Modes( c );
+		/* RFC 2813: client is now fully registered, inform all the
-		if( *modes ) Log( LOG_DEBUG, "User \"%s\" (+%s) registered (via %s, on %s, %d hop%s).", Client_Mask( c ), modes, Client_ID( Client ), Client_ID( intr_c ), Client_Hops( c ), Client_Hops( c ) > 1 ? "s": "" );
+		 * other servers about the new user.
-		else Log( LOG_DEBUG, "User \"%s\" registered (via %s, on %s, %d hop%s).", Client_Mask( c ), Client_ID( Client ), Client_ID( intr_c ), Client_Hops( c ), Client_Hops( c ) > 1 ? "s": "" );
+		 * RFC 1459: announce the new client only after receiving the
+		 * USER command, first we need more information! */
+		if (Req->argc >= 7) {
+			modes = Client_Modes(c);
+			LogDebug("User \"%s\" (+%s) registered (via %s, on %s, %d hop%s).",
+				Client_Mask(c), modes, Client_ID(Client),
+				Client_ID(intr_c), Client_Hops(c),
+				Client_Hops(c) > 1 ? "s": "");
 
-		/* Inform other servers about the new client */
+			Introduce_Client(Client, Req->argv[0],
-		Introduce_Client(Client, Req->argv[0], atoi(Req->argv[1]) + 1,
+				atoi(Req->argv[1]) + 1, Req->argv[2],
-				 Req->argv[2], Req->argv[3],
+				Req->argv[3], intr_c, Req->argv[5], Req->argv[6]);
-				 Client_MyToken(intr_c), Req->argv[5],
+		} else {
-				 Req->argv[6]);
+			LogDebug("User \"%s\" is beeing registered (RFC 1459) ...",
+				 Client_Mask(c));
+			Client_SetType(c, CLIENT_GOTNICK);
+		}
 
 		return CONNECTED;
 	}
@@ -394,6 +417,7 @@ GLOBAL bool
 IRC_USER(CLIENT * Client, REQUEST * Req)
 {
 	CLIENT *c;
+	char modes[CLIENT_MODE_LEN + 1] = "+";
 #ifdef IDENTAUTH
 	char *ptr;
 #endif
@@ -459,6 +483,21 @@ IRC_USER(CLIENT * Client, REQUEST * Req)
 
 		LogDebug("Connection %d: got valid USER command for \"%s\".",
 			 Client_Conn(Client), Client_Mask(c));
+
+		/* RFC 1459 style user registration? Inform other servers! */
+		if (Client_Type(c) == CLIENT_GOTNICK) {
+			strlcat(modes, Client_Modes(c), sizeof(modes));
+			Introduce_Client(Client, Client_ID(c), Client_Hops(c),
+					 Client_User(c), Client_Hostname(c),
+					 Client_Introducer(c), modes,
+					 Client_Info(c));
+			LogDebug("User \"%s\" (%s) registered (via %s, on %s, %d hop%s).",
+				 Client_Mask(c), modes, Client_ID(Client),
+				 Client_ID(Client_Introducer(c)), Client_Hops(c),
+				 Client_Hops(c) > 1 ? "s": "");
+			Client_SetType(c, CLIENT_USER);
+		}
+
 		return CONNECTED;
 	} else if (Client_Type(Client) == CLIENT_USER) {
 		/* Already registered connection */
@@ -695,7 +734,8 @@ Hello_User(CLIENT * Client)
 	/* Inform other servers */
 	strlcat(modes, Client_Modes(Client), sizeof(modes));
 	Introduce_Client(NULL, Client_ID(Client), 1, Client_User(Client),
-			 Client_Hostname(Client), 1, modes, Client_Info(Client));
+			 Client_Hostname(Client), NULL, modes,
+			 Client_Info(Client));
 
 	if (!IRC_WriteStrClient
 	    (Client, RPL_WELCOME_MSG, Client_ID(Client), Client_Mask(Client)))
@@ -752,15 +792,47 @@ Kill_Nick( char *Nick, char *Reason )
 
 
 static void
-Introduce_Client(CLIENT *From, const char *Nick, const int HopCount,
+Introduce_Client(CLIENT *From, char *Nick, const int HopCount, char *User,
-const char *User, const char *Host, const int Token, const char *Mode,
+		 char *Host, CLIENT *Server, char *Mode, char *Name)
-const char *Name)
 {
-	IRC_WriteStrServersPrefix(From,
+	INTRO_INFO i;
-				  From != NULL ? From : Client_ThisServer(),
+
-				  "NICK %s %d %s %s %d %s :%s",
+	i.nick = Nick;
-				  Nick, HopCount, User, Host, Token, Mode, Name);
+	i.hopcount = HopCount;
+	i.user = User ? User : "-";
+	i.host = Host ? Host : "-";
+	i.server = Server ? Server : Client_ThisServer();
+	i.mode = Mode ? Mode : "+";
+	i.name = Name ? Name : "";
+
+	IRC_WriteStrServersPrefixFlag_CB(From,
+				From != NULL ? From : Client_ThisServer(),
+				'\0', cb_introduceClient, (void *)(&i));
 } /* Introduce_Client */
 
 
+static void
+cb_introduceClient(CLIENT *Client, CLIENT *Prefix, void *data)
+{
+	INTRO_INFO *i = (INTRO_INFO *)data;
+	CONN_ID conn;
+
+	conn = Client_Conn(Client);
+	if (Conn_Options(conn) & CONN_RFC1459) {
+		/* RFC 1459 mode: separate NICK and USER commands */
+		Conn_WriteStr(conn, "NICK %s :%d", i->nick, i->hopcount);
+		Conn_WriteStr(conn, ":%s USER %s %s %s :%s",
+			      i->nick, i->user, i->host,
+			      Client_ID(i->server), i->name);
+	} else {
+		/* RFC 2813 mode: one combined NICK command */
+		IRC_WriteStrClientPrefix(Client, Prefix,
+					 "NICK %s %d %s %s %d %s :%s",
+					 i->nick, i->hopcount, i->user, i->host,
+					 Client_MyToken(i->server), i->mode,
+					 i->name);
+	}
+} /* cb_introduceClient */
+
+
 /* -eof- */