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psyced/world/net/psyc/server.c

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2009-01-26 20:12:53 +00:00
// $Id: server.c,v 1.102 2008/08/05 12:15:11 lynx Exp $ // vim:syntax=lpc
//
// the thing that answers on port 4404 of psyced.
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#include "common.h"
#include <net.h>
#include <services.h>
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#define NO_INHERIT
#include <server.h>
#ifdef __PIKE__
inherit net.psyc.circuit;
#else
// receiving variant
inherit PSYC_PATH "circuit";
#endif
// keep a list of objects to ->disconnected() when the driver tells us
volatile array(object) disconnect_notifies;
void do_notify_on_disconnect(object user) {
unless(disconnect_notifies)
disconnect_notifies = ({ });
disconnect_notifies += ({ user });
}
// only used by list_sockets()
string qName() {
switch (sizeof(disconnect_notifies)) {
case 0:
return 0;
case 1:
return to_string( disconnect_notifies[0] );
// default:
}
return to_string( sizeof(disconnect_notifies) );
}
//isServer() { return peerport < 0; }
int isServer() { return 1; }
#ifndef __PIKE__
load(ho, po) {
D0 ( if (peerport)
PP(("%O loaded twice for %O and %O\n", ME, peerport, po)); )
peerport = po;
// P3(("loaded server on %O\n", peerport))
return ME;
}
protected quit() { QUIT }
// self-destruct when the TCP link gets lost
disconnected(remaining) {
P2(( "%O got disconnected.\n", ME))
// emulate disconnected() for net/psyc/user
if (disconnect_notifies) {
foreach (object t : disconnect_notifies)
if (t) t->disconnected();
}
::disconnected(remaining);
QUIT // returns unexpected.. TODO
}
// actually bad considering that a packet may be in dns resolution
// and wants to callback deliver in here TODO
// saga: jedenfalls müssen wir entweder sofort destructen oder aber alle targets abmelden, die wir je angemeldet haben
// lynX: oder die unterscheidung zwischen active und server abschaffen
static varargs int block(vastring mc, vastring reason) {
P0(("Server blocked TCP PSYC connection from %O in %O (%O).\n",
query_ip_number(ME), ME, mc))
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#ifdef SYMLYNX
# define TEST_REDIR ""
# define TEXT_REDIR ""
#else
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# define TEST_REDIR ":_source_redirect\tpsyc://ve.symlynX.com\n"
# define TEXT_REDIR "Try the test server at [_source_redirect] instead!\n"
#endif
unless(mc) mc = "_error_illegal_source";
unless(reason) reason = "";
emit(".\n\
\n\
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" TEST_REDIR + mc +"\n\
Sorry, my configuration does not allow me to talk to you.\n\
"+ reason +"\n\
" TEXT_REDIR "\
.\n"
);
QUIT
}
#endif // PIKE
static void resolved(mixed host) {
string netloc, numericpeeraddr;
mixed uni, psycip;
unless (stringp(host)) {
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#if 1 //ndef SYMLYNX
if (host == -2) {
monitor_report("_warning_invalid_hostname",
S("%O: %O has an invalid IN PTR", ME,
query_ip_number(ME)));
# ifndef STRICT_DNS_POLICY
# ifndef __PIKE__
// we could instead lower the trust value for this
// host so that it can no longer send messages in
// a federated way, but still link into an identity
// as a client....... TODO.. like this?
if (trustworthy < 6) trustworthy = 1;
# endif
host = peerip;
# else
block("_error_invalid_hostname",
"Your IP address points to a hostname which doesn't point back to the IP.\n"
"You could be trying to spoof you're in somebody else's domain.\n"
"We can't let you do that, sorry.");
return;
# endif
}
else if (host == -1) host = peerip;
else {
P0(("resolved(%O) in %O. but that's impossible.\n",
host, ME))
block("_failure_invalid_hostname",
"Resolving your IP address triggered an internal error.");
return;
}
#else
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// we sent them to the test server, so let it be easy on them
host = peerip;
#endif
}
// maybe dns_rresolve should only return lower_case'd strings
// then we no longer have to do that everywhere else TODO
host = lower_case(host);
#ifdef EXTRA_RRESOLVE
EXTRA_RRESOLVE(host)
#endif
#ifndef __PIKE__
if (trustworthy < 6) {
if (trustworthy = legal_domain(host, peerport, "psyc", 0)) {
if (trustworthy < 3) trustworthy = 0;
}
else {
block();
return;
}
}
// the resolver does not register automatically, so here we go
register_host(peerip, host);
register_host(host);
#endif // PIKE
// register_target( "psyc://"+peeraddr );
numericpeeraddr = peeraddr;
peeraddr = peerhost = host;
// peerport has either positive or negative value
if (peerport && peerport != PSYC_SERVICE) peeraddr += ":"+peerport;
netloc = "psyc://"+peeraddr+"/";
register_target( netloc );
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#ifndef _flag_disable_module_authentication // OPTIONAL
// should this server be connected to a psyc client, then the new
// resolved name of the connection may have to be recognized as
// location for the person. finally this code should be unnecessary
// as you should never want to _link a person before seeing the
// _notice_circuit_established. maybe we should even enforce that.
// anyway, here's an attempt to cope with such a situation.. maybe
// it turns out useful someday (lynX after a quick patch by elrid).
//
psycip = "psyc://"+numericpeeraddr+"/";
if (uni = lookup_identification(psycip)) {
register_location(netloc, uni);
// cleanup? are you sure we will never need this again?
register_location(psycip, 0); //cleanup
}
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#endif // _flag_disable_module_authentication
// PIKE TPD: says psyc://127.0.0.1/ here .. should say
// psyc://localhost:-23232/ instead
P2(("%O resolves as %O (UNI %O)\n", ME, netloc, uni))
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// in the old days: greet();
}
int logon(int nothing) {
P2(("%O accepted TCP from %O (%s:%O)\n", ME,
query_ip_name(), query_ip_number(), peerport))
// we could set the next_input_to and reply with _failure until
// hostname is resolved .. TODO ... no, we need some form
// of queuing for the scripts which do not wait.. why? don't we
// squeeze received packets thru dns-lambdas anyway?
// peerport has either positive or negative value
//peeraddr = peerip+":"+peerport;
::logon(0);
#if 0 //def EXPERIMENTAL
// added this because greet() happens after dns resolution and
// some quick clients may not be waiting that long.. then again
// if they do, they deserve other treatment
sTextPath();
#endif
dns_rresolve(peerip, #'resolved);
return 1; // success
}