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psyced/world/net/psyc/circuit.c
2011-07-31 10:46:36 +02:00

451 lines
14 KiB
C

// vim:foldmethod=marker:syntax=lpc:noexpandtab
//
// The PSYC Circuit Implementation.
// Includes renderers and parsers for the PSYC syntax.
//
// $Id: circuit.c,v 1.202 2008/12/04 14:20:53 lynx Exp $
// local debug messages - turn them on by using psyclpc -DDcircuit=<level>
#ifdef Dcircuit
# undef DEBUG
# define DEBUG Dcircuit
#endif
#include "common.h"
#include <net.h>
#include <services.h>
#include <person.h>
#include <driver.h>
#include <uniform.h>
#include <text.h>
#include <psyc.h>
protected void quit(); // prototype
#ifdef __PIKE__
import net.psyc.common;
#else
// since this doesn't exec() the user object
// it needs to do its own network output
virtual inherit NET_PATH "output";
inherit PSYC_PATH "common";
#endif
// thats also why we do not inherit the generic server!
//
#ifndef QUIT
//define QUIT remove_interactive(ME); return 1;
# define QUIT destruct(ME); return 1;
#endif
//volatile mapping namecache = ([]);
int isServer() { return 0; }
volatile int flags = 0;
#define PSYC_TCP
// contains PSYC parser
#include "parse.i"
int greet() {
string usingmods;
sTextPath();
// we should know our port numbers from command line
// and with the new ports.h we do.. we just have to use it here..
// ehm.. how do we to_string() a dozen numbers efficiently? we don't huh?
// we patch ports.h to also provide #define PSYC_PORT_S etc? we let
// psyconf generate this string? how do we specify TLS ports? TODO
//
#define UNDERPROTS USINGPROTS ";PSYC/0.9 UDP IP/4;" \
"XMPP-S2S/1;IRC/2;XMPP-C2S/1;Chatlet;Telnet;" \
"HTTP/1.0;WAP"
#define USINGPROTS "PSYC/0.9 TCP IP/4"
#ifdef PRO_PATH
# if defined(BRAIN) && !defined(SLAVE) && !defined(VOLATILE)
// for the time being.. a special case with port numbers
# define PROTS "PSYC/0.9:4404 TCP IP/4;PSYC/0.9:4404 UDP IP/4;" \
"XMPP-S2S/1:5269;IRC/2:6667;XMPP-C2S/1:5222;Chatlet:2008;Telnet:23;" \
"HTTP/1.0:33333;XMLpsyc/0.3:1404;WAP"
// and the gateways brain provides..
// I would like to change that into old list-syntax again.. or lets implement
// this @_var stuff.. this damages my brain
# define SCHEMES ":_understand_schemes\taim;icq;irc;efnet;euirc;" \
"freenode;quakenet;galaxynetwork;klingons\n"
# define TSCHEMES "Gateways provided: [_understand_schemes].\n"
# else
# define SCHEMES ""
# define TSCHEMES ""
# define PROTS UNDERPROTS ";XMLpsyc/0.3"
# endif
#else
# define SCHEMES ""
# define TSCHEMES ""
# define PROTS UNDERPROTS
#endif
// we only understand circuit-level routing _state, the one that is so easy
// that we can expect any PSYC-TCP implementation to provide it, but PSYC
// state which needs to be stored per logical source and target still needs
// to be implemented. see also http://about.psyc.eu/State
//#define UNDERMODS "_state;_context"
#define UNDERMODS "_context"
usingmods = UNDERMODS;
#if defined(__MCCP__)
# define ZIPMOD ";_compress"
if (query_mccp(ME)) usingmods += ZIPMOD;
#else
# define ZIPMOD
#endif
#if defined(__TLS__)
# define TLSMOD ";_encrypt"
if (tls_query_connection_state(ME) > 0) usingmods += TLSMOD;
#else
# define TLSMOD
#endif
// TODO: if negotiation of _using_characters is implemented, then change this
// _available_characters into _understand_characters. same goes for
// _available_protocols, although i don't expect anyone to need this.
//
// the text messages in here are to say hello to clients.
// servers will just skip them..
//
// und eigentlich ist das alles nur eitelkeit, die vielen vars. sagt el. ;)
// should we rename _target into _target_raw here? maybe, then again
// all subsequent traffic still goes to this target unless the
// other side tells us her name
emit(S_GLYPH_PACKET_DELIMITER "\n");
emit("\
:_source "+ SERVER_UNIFORM +"\n\
:_target_peer psyc://"+ peeraddr +"/\n"
"\n\
:_implementation "+ SERVER_VERSION +" "+ DRIVER_VERSION +" "+ OSTYPE +" "+ MACHTYPE +"\n\
:_page_description http://www.psyc.eu/\n\
_notice_circuit_established\n\
Hello [_target_peer].\n\
Circuit to [_source] running [_implementation] established.\n" S_GLYPH_PACKET_DELIMITER "\n");
// ;ISO-8859-1;ISO-8859-15\n
emit("\
:_source "+ SERVER_UNIFORM +"\n\
\n\
:_available_hashes "
#if __EFUN_DEFINED__(sha1)
"sha1;"
#endif
#if __EFUN_DEFINED__(md5)
"md5;http-digest;digest-md5"
#endif
"\n\
:_available_characters UTF-8\n\
:_available_protocols " PROTS "\n\
" SCHEMES "\
:_understand_modules " UNDERMODS TLSMOD "\n\
:_using_characters " SYSTEM_CHARSET "\n\
:_using_protocols " USINGPROTS "\n\
:_using_modules "+ usingmods +"\n\
_status_circuit\n\
" TSCHEMES "\
Available protocols: [_available_protocols].\n" S_GLYPH_PACKET_DELIMITER "\n");
#ifdef _flag_log_sockets_PSYC
log_file("RAW_PSYC", "« %O greeted.\n", ME);
#endif
return 1;
}
static varargs int block(vastring mc, vastring reason) {
// we used to get here at shutdown time because legal_host was
// saying no.. but it's better to do it differently..
P0(("Circuit blocked TCP PSYC connection from %O in %O (%O).\n",
query_ip_number(ME), ME, mc))
#ifdef DEVELOPMENT
unless (ME)
raise_error("blocked destructed object?\n");
unless (interactive(ME))
raise_error("blocked non-interactive?\n");
#endif
write(S_GLYPH_PACKET_DELIMITER "\n\
\n\
:_source_redirect psyc://ve.symlynX.com\n\
_error_illegal_source\n\
Sorry, my configuration does not allow me to talk to you.\n\
Try the [_source_redirect] server instead!\n" S_GLYPH_PACKET_DELIMITER "\n");
QUIT
}
// this logon() is either called in psyc/server, so it has no args
// or it is actively called from psyc/active, when no failure has
// taken place. thus, the argument is useless.
int logon(int neverfails) {
#ifdef __TLS__
mixed cert;
#endif
object cur;
int isserver;
mixed m;
string t;
unless (ME) {
// this happens when shutdown has been initiated during
// establishment of the circuit. we get the callback,
// although we have already been destroyed. unfortunately
// we can't even find out which connection it was.
P3(("logon(%O) called in destructed object\n", neverfails))
return 0;
}
isserver = isServer();
peerip = query_ip_number(ME) || "127.0.0.1";
P3(("%O logon from %O\n", ME, peerip))
// in case of psyc/active this hostCheck has already performed
// in net/connect
if (isserver &&! hostCheck(peerip, peerport)) {
// also gets here when ME is 0
return block();
}
#ifdef __TLS__
sAuthHosts(([ ])); // reset authhosts
if (tls_available() && tls_query_connection_state(ME) == 1 && mappingp(cert = tls_certificate(ME, 0))) {
if (cert[0] != 0) {
// log error 17 or 18 + cert here
P0(("%O encountered a cert verify error %O in %O\n", ME,
cert[0], cert))
// and goodbye.
# ifdef _flag_enable_certificate_any
remove_interactive(ME);
return 0;
# endif
}
if (m = cert["2.5.29.17:dNSName"]) {
// FIXME: this does not yet handle wildcard DNS names
P1(("%O believing dNSName %O\n", ME, m))
// probably also: register_target?
// but be careful never to register_target wildcards
if (stringp(m)) sAuthenticated(m);
else foreach(t : m) sAuthenticated(t);
}
//#ifdef _flag_allow_certificate_name_common // to be switched this year
# ifndef _flag_disallow_certificate_name_common
// assume that CN is a host
// as this is an assumption only, we may NEVER register_target it
// note: CN is deprecated for good reasons.
else if (t = cert["2.5.4.3"]) {
P1(("%O believing CN %O\n", ME, t))
sAuthenticated(t);
}
# endif
if (m = tls_query_connection_info(ME)) {
P2(("%O is using the %O cipher.\n", ME, m[TLS_CIPHER]))
// shouldn't our negotiation have ensured we have PFS?
if (stringp(t = m[TLS_CIPHER]) &&! abbrev("DHE", t)) {
// croak("_warning_circuit_encryption_cipher",
// "Your cipher choice does not provide forward secrecy.");
monitor_report(
"_warning_circuit_encryption_cipher_details",
object_name(ME) +" · using "+ t +" cipher");
//debug_message(sprintf(
// "TLS connection info for %O is %O\n", ME, m));
//QUIT // are we ready for *this* !???
}
}
}
#endif
cvars = ([]);
pvars = ([ "_INTERNAL_origin" : ME ]);
next_input_to(#'startParse);
// even active connections want to time out to avoid lockups
// but quit() should check if there is a queue to return! TODO
call_out(#'quit, 90);
flags |= TCP_PENDING_TIMEOUT;
// unless(peeraddr) {
peeraddr = peerhost = peerip;
// peerport value is positive for real listen() ports
if (peerport) peeraddr += ":"+peerport;
// }
if (cur = find_target_handler( "psyc://"+ peeraddr +"/" )) {
unless (cur->isServer()) {
cur->takeover();
}
if (!interactive(cur)) {
destruct(cur);
}
}
register_target( "psyc://"+peeraddr+"/" , ME );
// merge with isserver-if further up? not sure
// if order of actions has some side fx..
unless (isserver) greet();
return 0;
}
#include "render.i"
// called from sendmsg() either by registered target or psyc: scheme
//int delivermsg(string target, string mc, string data,
varargs int msg(string source, string mc, string data,
mapping vars, vaint showingLog, vamixed target) {
string buf, context;
mixed rc;
#ifdef __TLS__
P2(( (tls_query_connection_state() ? "TLS": "TCP") +
"[%s] <= %s: %s %O\n", peeraddr || "error",
to_string(source), mc || "-", data))
// to_string(vars["_source_relay"] || source)
#else
P2(( "TCP[%s] <= %s: %s %O\n", peeraddr || "error",
to_string(source), mc || "-", data))
#endif
buf = "";
#ifndef NEW_RENDER
ASSERT("mc", mc, "Message from "+source+" w/out mc")
if (!stringp(data)) {
if (abbrev("_message", mc)) data = "";
else {
data = T(mc, "") || "";
P3(("fmt from textdb for %O: %O\n", mc, data))
}
} else if (data == S_GLYPH_PACKET_DELIMITER || data[0..1] == S_GLYPH_PACKET_DELIMITER "\n"
|| strstr(data, "\n" S_GLYPH_PACKET_DELIMITER "\n") != -1) {
# if 0 // one day we shall be able to parse that, too
vars["_length"] = strlen(data);
# else
P1(("%O: %O tried to send %O via psyc. censored.\n",
previous_object() || ME, vars["_nick"] || vars, data))
// data = "*** censored message ***";
return 0;
# endif
}
// modular message protocol layer
//
// this stuff should not be seperate from the one done
// for UDP!!! TODO
# if 1
if (context = vars["_INTERNAL_context"]) {
P4(("retransmit: %O - deleting source\n", data))
unless(vars["_source_relay"])
vars["_source_relay"] = source;
// public lastlog and history are sent with _context and _target
source = 0;
}
else if (context = vars["_context"]) {
P4(("1st transmit: %O - deleting source and target\n", data))
// we're not multipeering, so no sources here.
unless(vars["_source_relay"])
vars["_source_relay"] = source;
source = 0;
// if (vars["_INTERNAL_context"]) context = 0; // EXPERIMENTAL
// else {
// at least we get to see when he does that
// vars["_INTERNAL_target"] = target;
// oh he does it a lot currently
P2(("psycrender removing _target %O for %O in %O\n",
target, context, ME))
// history in fact is a state sync so it
// should be sent with _context AND _target TODO
target = 0;
// }
}
# else
context = vars["_context"];
# endif
if (context) {
buf+= ":_context\t"+ UNIFORM(context) +"\n";
if (source) buf += ":_source_relay\t"+ UNIFORM(source) +"\n";
// should it be _target_forward here?
if (target) buf += ":_target_relay\t"+ target +"\n";
} else {
if (source) buf += ":_source\t"+ UNIFORM(source) +"\n";
if (target) buf += ":_target\t"+ target +"\n";
}
#endif /* !NEW_RENDER */
rc = render_psyc(source, mc, data, vars, showingLog, target);
unless (rc) return 0;
buf += rc;
P4(("render_psyc %O for %O\n", rc, buf))
#if 0
# ifdef NEW_LINE
buf += "\n" S_GLYPH_PACKET_DELIMITER "\n";
# else
# ifdef SPYC
# echo net/spyc Warning: Erroneous extra newlines will be transmitted.
buf += "\n" S_GLYPH_PACKET_DELIMITER "\n";
# else
//# echo net/psyc Warning: Using inaccurate newline guessing strategy.
// textdb still provides formats with extra trailing newline.
// catching this at this point is kind of wrong. it doesn't
// take into consideration data that intentionally ends with
// a newline. This is a minor inconvenience, but still.. FIXME
//
if (strlen(data)) {
PT(("Newline guessing for %O (%O) %O\n", data, char_from_end(data, 1), '\n'))
}
if (strlen(data) && char_from_end(data, 1) != '\n') {
buf += "\n" S_GLYPH_PACKET_DELIMITER "\n";
} else {
// PT(("Guessed %O\n", buf))
buf += S_GLYPH_PACKET_DELIMITER "\n";
}
# endif
# endif
#endif
# ifdef _flag_log_sockets_PSYC
log_file("RAW_PSYC", "« %O\n%s\n", ME, buf);
# endif
//PT(("» %O\t%s\n", ME, buf))
return emit(buf);
}
void reboot(string reason, int restart, int pass) {
P3(("reboot(%O, %O, %O) in %O\n", pass, restart, reason, ME))
// this gets called in blueprints too, so we have to make sure
// we ARE indeed connected somewhere.
if (pass == 1 && interactive(ME)) {
// same in person.c
if (restart)
croak("_warning_server_shutdown_temporary",
"Server restart: [_reason]", ([ "_reason": reason ]) );
else
croak("_warning_server_shutdown",
"Server shutdown: [_reason]", ([ "_reason": reason ]) );
flags |= TCP_PENDING_DISCONNECT;
croak("_request_circuit_shutdown",
// the text message is to be removed ;)
"Please close this socket as you read this.");
}
}
// this is used to issue errors to the other side such as
// _error_invalid_method_compact. it is good to have!
varargs mixed croak(string mc, string data, vamapping vars, vamixed source) {
PT(("%O croak(%O, %O ..)\n", ME, mc,data))
return msg(0, mc, data, vars || ([]));
//return delivermsg(0, mc, data, vars || ([]));
}
int disconnected(string remaining) {
#if DEBUG > 0
if (remaining && (!stringp(remaining) || strlen(remaining)))
PP(("%O ignoring remaining data from socket: %O\n", ME,
remaining));
#endif
#ifdef _flag_log_sockets_PSYC
log_file("RAW_PSYC", "%O disconnected.\n", ME);
#endif
// wow.. a sincerely expected disconnect!
if (flags & TCP_PENDING_DISCONNECT) return 1;
#ifdef _flag_enable_report_failure_network_circuit_disconnect
monitor_report("_failure_network_circuit_disconnect",
object_name(ME) +" · lost PSYC circuit");
#else
P1(("%O disconnected unexpectedly\n", ME))
#endif
return 0; // unexpected
}