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psyced/world/net/psyc/common.c

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// vim:foldmethod=marker:syntax=lpc:noexpandtab
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// $Id: common.c,v 1.67 2008/08/05 12:21:34 lynx Exp $
//
// common code for UDP and TCP server
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#include "common.h"
#include <net.h>
#include <uniform.h>
#include <psyc.h>
#ifdef __MCCP__
# include <telnet.h>
#endif
#ifndef __PIKE__
virtual inherit NET_PATH "trust";
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#endif
// protos.
varargs mixed croak(string mc, string data, vamapping vars, vamixed source);
void connect_failure(string mc, string reason);
void runQ();
// microspect0rs.
string qScheme() { return "psyc"; }
int isServer() { return 0; }
int greet() { return 0; }
// rootMsg: handles messages to the psyc server root node
// lynX:
// i dont want this to be call_other'd, so i decided to inherit it
// into all psyc servers
// fippo:
// maybe we need a more generic root object to be inherited by
// all psyc and jabber servers
// it's there: net/root - yet it is not suitable for everything in here
varargs int rootMsg(mixed source, string mc, string data,
vamapping vars, vamixed target) {
string t;
#ifdef SCHWAN
mixed *u;
#endif
//PT((">>> %O::rootMsg(%O, %O, %O, %O, %O)\n", ME, source, mc, data, vars, target))
switch(mc) {
case "_status_circuit":
if (member(vars, "_understand_modules")) {
unless (pointerp(vars["_understand_modules"]))
vars["_understand_modules"] =
explode(vars["_understand_modules"], ";");
#ifdef __MCCP__
if (member(vars["_understand_modules"], "_compress") != -1) {
if(query_mccp(ME) || tls_query_connection_state(ME) > 0) break;
#ifdef FORK
croak("", "", ([ "+_using_modules" : "_compress" ]));
#else
croak("", "", ([ "_using_modules" : "_compress" ]));
#endif
enable_telnet(0);
start_mccp_compress(TELOPT_COMPRESS2);
}
#endif
}
break;
case "_notice_link_established":
case "_notice_circuit_established":
#if 0
// note: module negotation is started by client
if (pointerp(vars["_understand_modules"]) && !isServer()) {
string module;
foreach(module : vars["_understand_modules"]) {
#ifdef __MCCP__
if (module == "_compress") {
croak("_request_compression",
"Requesting compression using [_method]",
([ "_method" : "zlib" ]),
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SERVER_UNIFORM);
return;
}
#endif
#ifdef __TLS__
// sigh... we need tls client functionality for that!
if (module == "_encrypt") {
croak("_request_circuit_encrypt",
"Requesting transport layer security",
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([ ]), SERVER_UNIFORM);
return;
}
#endif
}
}
#endif
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if (source == SERVER_UNIFORM) {
#ifndef __PIKE__ // TPD
if (function_exists("connect_failure"))
connect_failure("_self",
"That sender claims to be me!\n");
#endif
// It may look tempting to do a register_localhost
// here, but since we didn't make a serious attempt
// to ensure we are talking to ourselves an outside
// host may want to fool us into thinking an address
// is us, then inject messages with localhost trust
// level. We're not going to do that. For automatic
// virtual host detection we need to smarten up still!
PT(("SUICIDE %O\n", ME))
destruct(ME);
return 1;
}
#ifndef __PIKE__ // TPD
if (function_exists("runQ")) {
P2(("%s in %O: runQ()\n", mc, ME));
runQ();
} else
#endif
{
P2(("%s in %O: no runQ to execute\n", mc, ME));
}
#ifdef SCHWAN
if (vars["_source_verbatim"]
&& u = parse_uniform(vars["_source_verbatim"])) {
if (u[UHost]) {
register_host(u[UHost]);
}
}
#endif
break;
case "_notice_authentication":
P0(("rootMsg got a _notice_authentication. never happens since entity.c\n"))
register_location(vars["_location"], source, 1);
break;
case "_error_invalid_authentication":
monitor_report(mc, psyctext("Breach: [_source] reports invalid authentication provided by [_location]", vars, data, source));
break;
#if 0
case "_request_session_compression":
case "_request_session_compress":
#ifdef __MCCP__
// dont try to compress an already compressed stream...
// and compressing an sslified stream is pretty
// meaningless
if(query_mccp(ME) || tls_query_connection_state(ME) > 0) break;
// reply with a _status_compression and start compression
croak("_notice_circuit_compress",
"Will restart with compression using [_method]",
([ "_method" : vars["_method"] || "zlib" ]),
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SERVER_UNIFORM);
enable_telnet(0);
start_mccp_compress(TELOPT_COMPRESS2);
// greet(); // TODO: calling it directly kills pypsyc
call_out(#'greet, 1);
break;
case "_notice_circuit_compress":
// TODO: we have to make sure that we had wanted to do
// compression to this host
//start_mccp_compress(TELOPT_COMPRESS2);
P0(("%O is getting compressed from the other side. ouch!\n", ME))
#else
croak("_error_unavailable_circuit_compress",
"Did I really flaunt compression to you?",
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([ ]), SERVER_UNIFORM);
#endif
break;
case "_request_circuit_encryption":
case "_request_circuit_encrypt":
#ifdef __TLS__
// answer with either _status_tls and go ahead, we are
// server side of the handshake
// or reply _error_tls_unavailable
int t;
if (t = tls_query_connection_state(ME) == 0) {
croak("_notice_circuit_encrypt",
"Enabling TLS encryption.", ([ ]),
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SERVER_UNIFORM);
tls_init_connection(ME);
// here we could actually need lars style
// to call greet when ready()
} else if (t > 0) {
/* sendmsg(source, "_error_tls_active",
"TLS is already active",
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([ ]), SERVER_UNIFORM); */
P0(("received %O for %O who already has TLS\n", mc, ME))
} else {
// negative numbers (current behaviour of ldmud)
// should never make it here
P0(("negative numbers are impossible here :)\n"))
}
#else
// we can not be advertising it
croak("_error_unavailable_circuit_encrypt",
"Can not remember telling you I had TLS.",
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([ ]), SERVER_UNIFORM);
#endif
break;
case "_notice_circuit_encrypt":
#if __EFUN_DEFINED__(tls_init_connection)
PT(("is my connection secure %O\n", tls_query_connection_state()))
// we just leave the socket to verreck, because closing it
// would probably only incite the other side to reconnect
tls_init_connection(ME, #'greet);
#endif
break;
#endif
case 0: // this is kinda funky!
if (member(vars, "_using_modules")) {
unless (pointerp(vars["_using_modules"]))
vars["_using_modules"] = ({ vars["_using_modules"] });
#ifdef __TLS__
if (member(vars["_using_modules"], "_encrypt") != -1) {
if (tls_query_connection_state(ME) == 0) {
croak("", "", ([ "_using_modules" : "_encrypt" ]));
tls_init_connection(ME);
}
# ifdef __MCCP__
} else
# else
}
# endif
#endif
#ifdef __MCCP__
if (member(vars["_using_modules"], "_compress") != -1) {
P0(("%O is getting compressed from the other side."
"ouch! Closing Connection!\n", ME))
croak("_error_compress_unavailable",
"I don't want to receive compressed data.");
destruct(ME);
}
#endif
}
break;
default:
// sendmsg(source, "_error_unsupported_method",
// "Don't know what to do with '[_method]'.",
// ([ "_method" : mc ]), "");
P1(("rootMsg(%O,%O,%O,%O,%O)\n", source,mc,data,vars,target))
#if 0 //def EXPERIMENTAL
// circuit root wasn't successful, let's pass the message
// on to the server root entity
return sendmsg("/", mc, data, vars, source);
#else
t = "Circuit got "+ mc;
if (target) t += " to "+ target;
unless (source) source = vars["_INTERNAL_source"]
|| vars["_INTERNAL_origin"];
if (source) t += " from "+ to_string(source);
monitor_report("_notice_forward"+ mc, psyctext(data ?
t+": "+data : t, vars, "", source));
return 0;
#endif
}
return 1;
}
void internalError() {
write("_failure_broken_parser\n.\n\n");
#ifndef __PIKE__ // TPD
// reicht das schon, oder müssen wir weitere maßnahmen ergreifen?
remove_interactive(ME);
#endif
}