/**
* Introduce a new user or service client in the network.
*
* @param From Remote server introducing the client or NULL (local).
* @param Client New client.
* @param Type Type of the client (CLIENT_USER or CLIENT_SERVICE).
*/
GLOBAL void
Client_Introduce(CLIENT *From, CLIENT *Client, int Type)
{
/* Set client type (user or service) */
Client_SetType(Client, Type);
if (From) {
if (Conf_NickIsService(Conf_GetServer(Client_Conn(From)),
Client_ID(Client)))
Client_SetType(Client, CLIENT_SERVICE);
LogDebug("%s \"%s\" (+%s) registered (via %s, on %s, %d hop%s).",
Client_TypeText(Client), Client_Mask(Client),
Client_Modes(Client), Client_ID(From),
Client_ID(Client_Introducer(Client)),
Client_Hops(Client), Client_Hops(Client) > 1 ? "s": "");
} else {
Log(LOG_NOTICE, "%s \"%s\" registered (connection %d).",
Client_TypeText(Client), Client_Mask(Client),
Client_Conn(Client));
Log_ServerNotice('c', "Client connecting: %s (%s@%s) [%s] - %s",
Client_ID(Client), Client_User(Client),
Client_Hostname(Client),
Conn_IPA(Client_Conn(Client)),
Client_TypeText(Client));
}
/* Inform other servers */
IRC_WriteStrServersPrefixFlag_CB(From,
From != NULL ? From : Client_ThisServer(),
'\0', cb_introduceClient, (void *)Client);
} /* Client_Introduce */
/**
* Announce new server in the network
* @param Client New server
* @param Server Existing server in the network
*/
static bool
Announce_Server(CLIENT * Client, CLIENT * Server)
{
CLIENT *c;
if (Client_Conn(Server) > NONE) {
/* Announce the new server to the one already registered
* which is directly connected to the local server */
if (!IRC_WriteStrClient
(Server, "SERVER %s %d %d :%s", Client_ID(Client),
Client_Hops(Client) + 1, Client_MyToken(Client),
Client_Info(Client)))
return DISCONNECTED;
}
if (Client_Hops(Server) == 1)
c = Client_ThisServer();
else
c = Client_TopServer(Server);
/* Inform new server about the one already registered in the network */
return IRC_WriteStrClientPrefix(Client, c, "SERVER %s %d %d :%s",
Client_ID(Server), Client_Hops(Server) + 1,
Client_MyToken(Server), Client_Info(Server));
} /* Announce_Server */
/**
* Announce an user or service to a server.
*
* This function differentiates between RFC1459 and RFC2813 server links and
* generates the appropriate commands to register the user or service.
*
* @param Client Server
* @param Prefix Prefix for the generated commands
* @param User User to announce
*/
GLOBAL bool
Client_Announce(CLIENT * Client, CLIENT * Prefix, CLIENT * User)
{
CONN_ID conn;
char *modes, *user, *host;
modes = Client_Modes(User);
user = Client_User(User) ? Client_User(User) : "-";
host = Client_Hostname(User) ? Client_Hostname(User) : "-";
conn = Client_Conn(Client);
if (Conn_Options(conn) & CONN_RFC1459) {
/* RFC 1459 mode: separate NICK and USER commands */
if (! Conn_WriteStr(conn, "NICK %s :%d",
Client_ID(User), Client_Hops(User) + 1))
return DISCONNECTED;
if (! Conn_WriteStr(conn, ":%s USER %s %s %s :%s",
Client_ID(User), user, host,
Client_ID(Client_Introducer(User)),
Client_Info(User)))
return DISCONNECTED;
if (modes[0]) {
if (! Conn_WriteStr(conn, ":%s MODE %s +%s",
Client_ID(User), Client_ID(User),
modes))
return DISCONNECTED;
}
} else {
/* RFC 2813 mode: one combined NICK or SERVICE command */
if (Client_Type(User) == CLIENT_SERVICE
&& Client_HasFlag(Client, 'S')) {
if (!IRC_WriteStrClientPrefix(Client, Prefix,
"SERVICE %s %d * +%s %d :%s",
Client_Mask(User),
Client_MyToken(Client_Introducer(User)),
modes, Client_Hops(User) + 1,
Client_Info(User)))
return DISCONNECTED;
} else {
if (!IRC_WriteStrClientPrefix(Client, Prefix,
"NICK %s %d %s %s %d +%s :%s",
Client_ID(User), Client_Hops(User) + 1,
user, host,
Client_MyToken(Client_Introducer(User)),
modes, Client_Info(User)))
return DISCONNECTED;
}
}
if (Client_HasFlag(Client, 'M')) {
/* Synchronize metadata */
if (Client_HostnameCloaked(User)) {
if (!IRC_WriteStrClientPrefix(Client, Prefix,
"METADATA %s cloakhost :%s",
Client_ID(User),
Client_HostnameCloaked(User)))
return DISCONNECTED;
}
if (Client_AccountName(User)) {
if (!IRC_WriteStrClientPrefix(Client, Prefix,
"METADATA %s accountname :%s",
Client_ID(User),
Client_AccountName(User)))
return DISCONNECTED;
}
if (Conn_GetCertFp(Client_Conn(User))) {
if (!IRC_WriteStrClientPrefix(Client, Prefix,
"METADATA %s certfp :%s",
Client_ID(User),
Conn_GetCertFp(Client_Conn(User))))
return DISCONNECTED;
}
}
return CONNECTED;
} /* Client_Announce */
/**
* Handle ENDOFMOTD (376) numeric and login remote server.
* The peer is either an IRC server (no IRC+ protocol), or we got the
* ENDOFMOTD numeric from an IRC+ server. We have to register the new server.
*/
GLOBAL bool
IRC_Num_ENDOFMOTD(CLIENT * Client, UNUSED REQUEST * Req)
{
int max_hops, i;
CLIENT *c;
CHANNEL *chan;
Client_SetType(Client, CLIENT_SERVER);
Log(LOG_NOTICE | LOG_snotice,
"Server \"%s\" registered (connection %d, 1 hop - direct link).",
Client_ID(Client), Client_Conn(Client));
/* Get highest hop count */
max_hops = 0;
c = Client_First();
while (c) {
if (Client_Hops(c) > max_hops)
max_hops = Client_Hops(c);
c = Client_Next(c);
}
/* Inform the new server about all other servers, and announce the
* new server to all the already registered ones. Important: we have
* to do this "in order" and can't introduce servers of which the
* "toplevel server" isn't known already. */
for (i = 0; i < (max_hops + 1); i++) {
for (c = Client_First(); c != NULL; c = Client_Next(c)) {
if (Client_Type(c) != CLIENT_SERVER)
continue; /* not a server */
if (Client_Hops(c) != i)
continue; /* not actual "nesting level" */
if (c == Client || c == Client_ThisServer())
continue; /* that's us or the peer! */
if (!Announce_Server(Client, c))
return DISCONNECTED;
}
}
/* Announce all the users to the new server */
c = Client_First();
while (c) {
if (Client_Type(c) == CLIENT_USER ||
Client_Type(c) == CLIENT_SERVICE) {
if (!Client_Announce(Client, Client_ThisServer(), c))
return DISCONNECTED;
}
c = Client_Next(c);
}
/* Announce all channels to the new server */
chan = Channel_First();
while (chan) {
if (Channel_IsLocal(chan)) {
chan = Channel_Next(chan);
continue;
}
#ifdef IRCPLUS
/* Send CHANINFO if the peer supports it */
if (Client_HasFlag(Client, 'C')) {
if (!Send_CHANINFO(Client, chan))
return DISCONNECTED;
}
#endif
if (!Announce_Channel(Client, chan))
return DISCONNECTED;
/* Get next channel ... */
chan = Channel_Next(chan);
}
#ifdef IRCPLUS
if (Client_HasFlag(Client, 'L')) {
LogDebug("Synchronizing INVITE- and BAN-lists ...");
if (!Synchronize_Lists(Client))
return DISCONNECTED;
}
#endif
if (!IRC_WriteStrClient(Client, "PING :%s",
Client_ID(Client_ThisServer())))
return DISCONNECTED;
return CONNECTED;
} /* IRC_Num_ENDOFMOTD */
/**
* Handler for the IRC command "SERVER".
* See RFC 2813 section 4.1.2.
*/
GLOBAL bool
IRC_SERVER( CLIENT *Client, REQUEST *Req )
{
char str[LINE_LEN];
CLIENT *from, *c;
int i;
CONN_ID con;
assert( Client != NULL );
assert( Req != NULL );
/* Return an error if this is not a local client */
if (Client_Conn(Client) <= NONE)
return IRC_WriteStrClient(Client, ERR_UNKNOWNCOMMAND_MSG,
Client_ID(Client), Req->command);
if (Client_Type(Client) == CLIENT_GOTPASS ||
Client_Type(Client) == CLIENT_GOTPASS_2813) {
/* We got a PASS command from the peer, and now a SERVER
* command: the peer tries to register itself as a server. */
LogDebug("Connection %d: got SERVER command (new server link) ...",
Client_Conn(Client));
if(( Req->argc != 2 ) && ( Req->argc != 3 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
/* Ist this server configured on out side? */
for( i = 0; i < MAX_SERVERS; i++ ) if( strcasecmp( Req->argv[0], Conf_Server[i].name ) == 0 ) break;
if( i >= MAX_SERVERS )
{
Log( LOG_ERR, "Connection %d: Server \"%s\" not configured here!", Client_Conn( Client ), Req->argv[0] );
Conn_Close( Client_Conn( Client ), NULL, "Server not configured here", true);
return DISCONNECTED;
}
if( strcmp( Client_Password( Client ), Conf_Server[i].pwd_in ) != 0 )
{
/* wrong password */
Log( LOG_ERR, "Connection %d: Got bad password from server \"%s\"!", Client_Conn( Client ), Req->argv[0] );
Conn_Close( Client_Conn( Client ), NULL, "Bad password", true);
return DISCONNECTED;
}
/* Is there a registered server with this ID? */
if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
Client_SetID( Client, Req->argv[0] );
Client_SetHops( Client, 1 );
Client_SetInfo( Client, Req->argv[Req->argc - 1] );
/* Is this server registering on our side, or are we connecting to
* a remote server? */
con = Client_Conn(Client);
if (Client_Token(Client) != TOKEN_OUTBOUND) {
/* Incoming connection, send user/pass */
if (!IRC_WriteStrClient(Client, "PASS %s %s",
Conf_Server[i].pwd_out,
NGIRCd_ProtoID)
|| !IRC_WriteStrClient(Client, "SERVER %s 1 :%s",
Conf_ServerName,
Conf_ServerInfo)) {
Conn_Close(con, "Unexpected server behavior!",
NULL, false);
return DISCONNECTED;
}
Client_SetIntroducer(Client, Client);
Client_SetToken(Client, 1);
} else {
/* outgoing connect, we already sent a SERVER and PASS
* command to the peer */
Client_SetToken(Client, atoi(Req->argv[1]));
}
/* Mark this connection as belonging to an configured server */
Conf_SetServer(i, con);
/* Check protocol level */
if (Client_Type(Client) == CLIENT_GOTPASS) {
/* We got a "simple" PASS command, so the peer is
* using the protocol as defined in RFC 1459. */
if (! (Conn_Options(con) & CONN_RFC1459))
Log(LOG_INFO,
"Switching connection %d (\"%s\") to RFC 1459 compatibility mode.",
con, Client_ID(Client));
Conn_SetOption(con, CONN_RFC1459);
}
Client_SetType(Client, CLIENT_UNKNOWNSERVER);
#ifdef ZLIB
if (strchr(Client_Flags(Client), 'Z') && !Zip_InitConn(con)) {
Conn_Close( con, "Can't inizialize compression (zlib)!", NULL, false );
return DISCONNECTED;
}
#endif
#ifdef IRCPLUS
if (strchr(Client_Flags(Client), 'H')) {
LogDebug("Peer supports IRC+ extended server handshake ...");
if (!IRC_Send_ISUPPORT(Client))
return DISCONNECTED;
return IRC_WriteStrClient(Client, RPL_ENDOFMOTD_MSG,
Client_ID(Client));
} else {
#endif
if (Conf_MaxNickLength != CLIENT_NICK_LEN_DEFAULT)
Log(LOG_CRIT,
"Attention: this server uses a non-standard nick length, but the peer doesn't support the IRC+ extended server handshake!");
#ifdef IRCPLUS
}
#endif
return IRC_Num_ENDOFMOTD(Client, Req);
}
else if( Client_Type( Client ) == CLIENT_SERVER )
{
/* New server is being introduced to the network */
if( Req->argc != 4 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
/* check for existing server with same ID */
if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
from = Client_Search( Req->prefix );
if( ! from )
{
/* Uh, Server, that introduced the new server is unknown?! */
Log( LOG_ALERT, "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)", Req->prefix, Client_Conn( Client ));
Conn_Close( Client_Conn( Client ), NULL, "Unknown ID in prefix of SERVER", true);
return DISCONNECTED;
}
c = Client_NewRemoteServer(Client, Req->argv[0], from, atoi(Req->argv[1]), atoi(Req->argv[2]), Req->argv[3], true);
if (!c) {
Log( LOG_ALERT, "Can't create client structure for server! (on connection %d)", Client_Conn( Client ));
Conn_Close( Client_Conn( Client ), NULL, "Can't allocate client structure for remote server", true);
return DISCONNECTED;
}
if(( Client_Hops( c ) > 1 ) && ( Req->prefix[0] )) snprintf( str, sizeof( str ), "connected to %s, ", Client_ID( from ));
else strcpy( str, "" );
Log( LOG_NOTICE|LOG_snotice, "Server \"%s\" registered (via %s, %s%d hop%s).", Client_ID( c ), Client_ID( Client ), str, Client_Hops( c ), Client_Hops( c ) > 1 ? "s": "" );
/* notify other servers */
IRC_WriteStrServersPrefix( Client, from, "SERVER %s %d %d :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_MyToken( c ), Client_Info( c ));
return CONNECTED;
} else
return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
Client_ID(Client), Req->command);
} /* IRC_SERVER */
