Implement WEBIRC command

The WEBIRC command is used by some Web-to-IRC gateways to set the correct
user name and host name of users instead of their own.

Syntax: WEBIRC <password> <username> <hostname> <ip-address>

The <password> must be set using the new configuration variable "WebircPassword" in the [Global] section of ngircd.conf.

Please note that the <ip-address> is currently not used by ngIRCd (we don't store it in the CLIENT structure, only the resolved hostname).

8 files changed, 73 insertions, 20 deletions

diff --git a/doc/sample-ngircd.conf b/doc/sample-ngircd.conf
index b945224e..db326c98 100644
--- a/doc/sample-ngircd.conf
+++ b/doc/sample-ngircd.conf
@@ -28,9 +28,15 @@
 	# LINKS requests for example.
 	Info = Server Info Text
 
-	# Global password for all users needed to connect to the server
+	# Global password for all users needed to connect to the server.
+	# (Default: not set)
 	;Password = abc
 
+	# Password required for using the WEBIRC command used by some
+	# Web-to-IRC gateways. If not set/empty, the WEBIRC command can't
+	# be used. (Default: not set)
+	;WebircPassword = xyz
+
 	# Information about the server and the administrator, used by the
 	# ADMIN command. Not required by server but by RFC!
 	;AdminInfo1 = Description
diff --git a/man/ngircd.conf.5.tmpl b/man/ngircd.conf.5.tmpl
index 4d55592d..46e0308a 100644
--- a/man/ngircd.conf.5.tmpl
+++ b/man/ngircd.conf.5.tmpl
@@ -73,6 +73,11 @@ example.
 Global password for all users needed to connect to the server. The default
 is empty, so no password is required.
 .TP
+\fBWebircPassword\fR
+Password required for using the WEBIRC command used by some Web-to-IRC
+gateways. If not set or empty, the WEBIRC command can't be used.
+Default: not set.
+.TP
 \fBAdminInfo1\fR, \fBAdminInfo2\fR, \fBAdminEMail\fR
 Information about the server and the administrator, used by the ADMIN
 command.
diff --git a/src/ngircd/conf.c b/src/ngircd/conf.c
index fae2a28c..694b5d46 100644
--- a/src/ngircd/conf.c
+++ b/src/ngircd/conf.c
@@ -1,6 +1,6 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2009 Alexander Barton (alex@barton.de)
+ * Copyright (c)2001-2010 Alexander Barton (alex@barton.de)
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -291,16 +291,17 @@ Conf_Test( void )
 	}
 
 	puts( "[GLOBAL]" );
-	printf( "  Name = %s\n", Conf_ServerName );
-	printf( "  Info = %s\n", Conf_ServerInfo );
-	printf( "  Password = %s\n", Conf_ServerPwd );
-	printf( "  AdminInfo1 = %s\n", Conf_ServerAdmin1 );
-	printf( "  AdminInfo2 = %s\n", Conf_ServerAdmin2 );
-	printf( "  AdminEMail = %s\n", Conf_ServerAdminMail );
-	printf( "  MotdFile = %s\n", Conf_MotdFile );
-	printf( "  MotdPhrase = %s\n", Conf_MotdPhrase );
-	printf( "  ChrootDir = %s\n", Conf_Chroot );
-	printf( "  PidFile = %s\n", Conf_PidFile);
+	printf("  Name = %s\n", Conf_ServerName);
+	printf("  Info = %s\n", Conf_ServerInfo);
+	printf("  Password = %s\n", Conf_ServerPwd);
+	printf("  WebircPassword = %s\n", Conf_WebircPwd);
+	printf("  AdminInfo1 = %s\n", Conf_ServerAdmin1);
+	printf("  AdminInfo2 = %s\n", Conf_ServerAdmin2);
+	printf("  AdminEMail = %s\n", Conf_ServerAdminMail);
+	printf("  MotdFile = %s\n", Conf_MotdFile);
+	printf("  MotdPhrase = %s\n", Conf_MotdPhrase);
+	printf("  ChrootDir = %s\n", Conf_Chroot);
+	printf("  PidFile = %s\n", Conf_PidFile);
 	printf("  Listen = %s\n", Conf_ListenAddress);
 	fputs("  Ports = ", stdout);
 	ports_puts(&Conf_ListenPorts);
@@ -845,6 +846,13 @@ Handle_GLOBAL( int Line, char *Var, char *Arg )
 			Config_Error_TooLong( Line, Var );
 		return;
 	}
+	if (strcasecmp(Var, "WebircPassword") == 0) {
+		/* Password required for WEBIRC command */
+		len = strlcpy(Conf_WebircPwd, Arg, sizeof(Conf_WebircPwd));
+		if (len >= sizeof(Conf_WebircPwd))
+			Config_Error_TooLong(Line, Var);
+		return;
+	}
 	if( strcasecmp( Var, "AdminInfo1" ) == 0 ) {
 		/* Administrative info #1 */
 		len = strlcpy( Conf_ServerAdmin1, Arg, sizeof( Conf_ServerAdmin1 ));
diff --git a/src/ngircd/conf.h b/src/ngircd/conf.h
index 01805155..5764d0f3 100644
--- a/src/ngircd/conf.h
+++ b/src/ngircd/conf.h
@@ -1,6 +1,6 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2008 Alexander Barton (alex@barton.de)
+ * Copyright (c)2001-2010 Alexander Barton (alex@barton.de)
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -188,6 +188,9 @@ GLOBAL bool Conf_AddServer PARAMS(( const char *Name, UINT16 Port, const char *H
 
 GLOBAL bool Conf_IsService PARAMS((int ConfServer, const char *Nick));
 
+/* Password required by WEBIRC command */
+GLOBAL char Conf_WebircPwd[CLIENT_PASS_LEN];
+
 
 #endif
 
diff --git a/src/ngircd/conn.c b/src/ngircd/conn.c
index 1e4ba0ab..cd350a8d 100644
--- a/src/ngircd/conn.c
+++ b/src/ngircd/conn.c
@@ -1999,10 +1999,14 @@ cb_Read_Resolver_Result( int r_fd, UNUSED short events )
 	c = Conn_GetClient( i );
 	assert( c != NULL );
 
-	/* Only update client information of unregistered clients */
-	if( Client_Type( c ) == CLIENT_UNKNOWN ) {
-		strlcpy(My_Connections[i].host, readbuf, sizeof( My_Connections[i].host));
-		Client_SetHostname( c, readbuf);
+	/* Only update client information of unregistered clients.
+	 * Note: user commands (e. g. WEBIRC) are always read _after_ reading
+	 * the resolver results, so we don't have to worry to override settings
+	 * from these commands here. */
+	if(Client_Type(c) == CLIENT_UNKNOWN) {
+		strlcpy(My_Connections[i].host, readbuf,
+			sizeof(My_Connections[i].host));
+		Client_SetHostname(c, readbuf);
 #ifdef IDENTAUTH
 		++identptr;
 		if (*identptr) {
diff --git a/src/ngircd/irc-login.c b/src/ngircd/irc-login.c
index 7b73d40f..2de4bd58 100644
--- a/src/ngircd/irc-login.c
+++ b/src/ngircd/irc-login.c
@@ -1,6 +1,6 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2008 Alexander Barton (alex@barton.de)
+ * Copyright (c)2001-2010 Alexander Barton (alex@barton.de)
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -557,6 +557,31 @@ IRC_SERVICE(CLIENT *Client, REQUEST *Req)
 } /* IRC_SERVICE */
 
 
+/**
+ * Handler for the IRC command "WEBIRC".
+ * Syntax: WEBIRC <password> <username> <real-hostname> <real-IP-address>
+ */
+GLOBAL bool
+IRC_WEBIRC(CLIENT *Client, REQUEST *Req)
+{
+	/* Exactly 4 parameters are requited */
+	if (Req->argc != 4)
+		return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
+					  Client_ID(Client), Req->command);
+
+	if (!Conf_WebircPwd[0] || strcmp(Req->argv[0], Conf_WebircPwd) != 0)
+		return IRC_WriteStrClient(Client, ERR_PASSWDMISMATCH_MSG,
+					  Client_ID(Client));
+
+	LogDebug("Connection %d: got valid WEBIRC command: user=%s, host=%s, ip=%s",
+		 Client_Conn(Client), Req->argv[1], Req->argv[2], Req->argv[3]);
+
+	Client_SetUser(Client, Req->argv[1], true);
+	Client_SetHostname(Client, Req->argv[2]);
+	return CONNECTED;
+} /* IRC_WEBIRC */
+
+
 GLOBAL bool
 IRC_QUIT( CLIENT *Client, REQUEST *Req )
 {
diff --git a/src/ngircd/irc-login.h b/src/ngircd/irc-login.h
index 0b920380..1504e0b7 100644
--- a/src/ngircd/irc-login.h
+++ b/src/ngircd/irc-login.h
@@ -1,6 +1,6 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2008 Alexander Barton (alex@barton.de)
+ * Copyright (c)2001-2010 Alexander Barton (alex@barton.de)
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -19,6 +19,7 @@ GLOBAL bool IRC_PASS PARAMS((CLIENT *Client, REQUEST *Req));
 GLOBAL bool IRC_NICK PARAMS((CLIENT *Client, REQUEST *Req));
 GLOBAL bool IRC_USER PARAMS((CLIENT *Client, REQUEST *Req));
 GLOBAL bool IRC_SERVICE PARAMS((CLIENT *Client, REQUEST *Req));
+GLOBAL bool IRC_WEBIRC PARAMS((CLIENT *Client, REQUEST *Req));
 GLOBAL bool IRC_PING PARAMS((CLIENT *Client, REQUEST *Req));
 GLOBAL bool IRC_PONG PARAMS((CLIENT *Client, REQUEST *Req));
 GLOBAL bool IRC_QUIT PARAMS((CLIENT *Client, REQUEST *Req));
diff --git a/src/ngircd/parse.c b/src/ngircd/parse.c
index 2c28a309..3710d70c 100644
--- a/src/ngircd/parse.c
+++ b/src/ngircd/parse.c
@@ -1,6 +1,6 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2008 Alexander Barton (alex@barton.de)
+ * Copyright (c)2001-2010 Alexander Barton (alex@barton.de)
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -103,6 +103,7 @@ static COMMAND My_Commands[] =
 	{ "USERS", IRC_USERS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
 	{ "VERSION", IRC_VERSION, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
 	{ "WALLOPS", IRC_WALLOPS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+	{ "WEBIRC", IRC_WEBIRC, CLIENT_UNKNOWN, 0, 0, 0 },
 	{ "WHO", IRC_WHO, CLIENT_USER, 0, 0, 0 },
 	{ "WHOIS", IRC_WHOIS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
 	{ "WHOWAS", IRC_WHOWAS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },