// This file written completely by Tim Johnson (Tim@TimMUD)
static void read_callback(int fd, mixed info){
// This is called when messages come in from a MUD.
// Should reject all messages if they have not done a (successful) startup-req,
// Should check to make sure the fd matches with the mud they are claiming to be, else error.
// because all packets require an originator_mudname.
// If target is the name of the router, then call the function in this object.
// if target is 0, then broadcast to muds.
// Do an error if target mudname is not known.
//
// According to: http://www.intermud.org/i3/specs/formats.php3
// Transmissions are LPC arrays with a predefined set of six initial elements:
// ({ type, ttl, originator mudname, originator username, target mudname, target username, ... }).
// info[0]=type
// info[1]=ttl
// info[2]=originator mudname
// info[3]=originator username
// info[4]=target mudname
// info[5]=target username
string mudname;
int i;
trr("Received from fd("+fd+"), fd("+socket_address(fd)+")\n"+identify(info),((info[0] == "auth-mud-req" || info[0] == "auth-mud-reply") ? "magenta" : "green"));
// Base info in a packet is of size 6.
if(sizeof(info)<6 ||
!stringp(info[0]) ||
!intp(info[1]) || !stringp(info[2]) ||
(!stringp(info[3]) && info[3]!=0) ||
(!stringp(info[4]) && info[4]!=0) ||
(!stringp(info[5]) && info[5]!=0) ) {
write_data(fd,({
// okay, their initial data isn't fully there...
// careful about array out of bounds...
"error",5,router_name,0,
(sizeof(info)>=3 ? info[2] : 0), // mud name
(sizeof(info)>=4 ? info[3] : 0), // user name
"bad-pkt","Invalid initial data",info
}));
return;
}
if(info[4]!=0 && !connected_muds[info[4]] && info[4]!=router_name){
// if target mud is not 0 (broadcasting), not the router name,
// and not a connected MUD
write_data(fd,({
"error",
5,
router_name,
0,
info[2],
info[3],
"unk-dst", // same as I3
"destination unknown", // same as I3
info
}));
trr("Error [unk-dst], because target is "+info[4]+" and thus invalid.");
return;
}
if(sscanf(info[0],"startup-req-%d",i)==1){
// special condition for startup-req...
trr("calling process_startup_req, i="+i+", fd="+fd+" which is: "+socket_address(fd));
//call_other(this_object(),"process_startup_req",i,info,fd);
this_object()->process_startup_req(i,info,fd);
return;
}
if(!connected_muds[info[2]] || (connected_muds[info[2]]!=fd)){
// MUD hasn't done a startup-req yet
write_data(fd,({
"error",
5,
router_name,
0, // originator username
info[2], // mud name
info[3], // user name
"unk-src", // error code
"Your MUD hasn't registered as "+info[2]+" yet", // Error message
info
}));
trr("They have not done a startup-req for fd="+fd+", mudname="+info[2]);
return;
}
// at this point, I guess it has a valid origin and stuff
if(sscanf(info[0],"channel-%*s")==1){ // command has a "channel-" prefix
// special case for channel stuff
trr("calling process_channel...");
process_channel(fd,info);
return;
}
if(info[0]=="chan-filter-reply"){
if(!stringp(info[6]) || sizeof(info[7])<9 ){
// avoid out-of-bounds
send_error(info[2],info[3],"bad-pkt",
"Invalid chan-filter-reply packet.",info);
}
if(channels[info[6]][1]!=info[2]){
send_error(info[2],info[3],"not-allowed",
"You are not the owner of "+info[6],info);
return;
}
if(member_array(info[7][6],({ "channel-a", "channel-e", "channel-t"}))==-11){
// Not a valid channel packet.
send_error(info[2],info[3],"not-allowed","*giggles*",info);
}
if(info[6]!=info[7][6]){
// They're trying to trick me into broadcasting
// fake messages on another channel!
// That's pretty funny :P
// I'll have to remember to check if the official router falls for it.
send_error(info[2],info[3],"not-allowed","Hehe!",info);
return;
}
if(member_array(info[7][6],({ "channel-a", "channel-e", "channel-t"}))){
}
// Broadcast the message...
foreach(mudname in keys(connected_muds)){
if(member_array(mudname, listening[info[6]])!=-1)
write_data(connected_muds[mudname],info[7]);
}
return;
}
if(info[4]==0){ // if broadcasting this...
broadcast_data(connected_muds,info);
return;
}
if(info[4]==router_name) {
// Something meant for the router but not handled by now!
send_error(info[2],info[3],"not-imp","Unknown command sent to router: "+info[0],info);
trr("unhandled packet meant for router: "+info[0],"red");
log_file("server","UNHANDLED PACKET:\n"+identify(info)+"\n");
return;
}
// at this point, I guess you should forward it to the destination...
if(info[0]=="locate-reply"){
// Special case for locate-reply, because protocol 3 has a larger packet...
if(sizeof(info)==8 && mudinfo[info[4]]["protocol"]>2){
// originator mud is sending a protocol 1/2 response,
// but target understands 3, so add the extra info
write_data(connected_muds[info[4]], ({
info[0],info[1],info[2],info[3],info[4],info[5],
info[6],info[7],0,0
}));
return;
}
if(sizeof(info)==10 && mudinfo[info[4]]["protocol"]<=2){
// target mud is being sent a protocol 3 response,
// but only understands 1 & 2, so strip the extra info
write_data(connected_muds[info[4]], ({
info[0],info[1],info[2],info[3],info[4],info[5],
info[6],info[7]
}));
return;
}
}
write_data(connected_muds[info[4]], info);
return;
}
