mirror of git://git.psyced.org/git/psyced
113 lines
2.8 KiB
C
113 lines
2.8 KiB
C
// vim:foldmethod=marker:syntax=lpc:noexpandtab
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// $Id: udp.c,v 1.36 2008/08/05 12:21:34 lynx Exp $
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//
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#include "common.h"
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#include <net.h>
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#include <person.h>
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#include <services.h>
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#include <uniform.h>
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#include <psyc.h>
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// SECURITY CONCERN:
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// originating udp host and port numbers can rather easily be spoofed
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// and currently many routers/gateways won't bother delivering a packet which
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// couldn't possibly have come from that direction. UDP may generally
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// need to be considered not trustworthy, even if it apparently comes
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// from localhost. okay, hopefully our kernel is smart enough not to
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// believe an incoming packet to be from localhost. it's his job!
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#ifdef __PIKE__
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import net.psyc.common;
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#else
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inherit PSYC_PATH "common";
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#endif
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// network location of remote server (hostname or hostname:port)
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volatile mapping namecache = ([]);
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// volatile int timeoutPending;
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// TODO? should keep caches of host:port per remote target somewhat like tcp
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#ifdef FORK
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# include "routerparse.i"
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#else
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# include "parse.i"
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#endif
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object load() { return ME; } // avoid a find_object call in obj/master
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parseUDP2(host, ip, port, msg) {
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string *m;
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int i, l
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#ifdef FORK
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, parsed
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#endif
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;
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unless (stringp(host)) host = ip;
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P3(( "parseUDP(%O,%O): %O\n", ip,port,msg ))
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pvars = ([ ]);
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// this call is a performance killer
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// should UDP get used heavily.. TODO
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// needs hash-based host matching, not linear
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unless (hostCheck(ip, port, 1)) {
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log_file("PSYCBLOCK", "UDP from "+ip
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+" ignored » "+msg+" «\n");
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// netloc = "psyc://"+ip+":"+port;
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// sendmsg(netloc, "_error_illegal_source",
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// "Sorry, my configuration does not permit to talk to you.\n");
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return;
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}
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//netloc = "psyc://"+ip;
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peeraddr = peerhost = host;
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if (port != PSYC_SERVICE) {
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peerport = port;
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peeraddr += ":"+port+"d"; // this is a UDP peerport
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}
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// else: we presume a UDP 4404 also listens on TCP
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#ifndef GAMMA
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P1(("./psyc/udp.c: paranoid extra restart\n"))
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restart(); // leading . does that anyway
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#endif
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pvars["_INTERNAL_source"] = "psyc://"+peeraddr+"/";
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// m = regexplode(msg, "\r?\n"); ?
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m = explode(msg, "\n");
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for (l=0; l<sizeof(m); l++) {
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// i'd like to know why no-mc has to be an empty string
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// rather than NULL from now on.
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// should you find out, pls tell me.. -lynX
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#ifdef FORK
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if (parsed == 2) getdata(m[l]);
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else unless (parsed = mmp_parse(m[l])) {
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#else
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if (sizeof(mc)) getdata(m[l]);
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else unless (parse(m[l])) {
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#endif
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log_file("PSYCHACK", "Can't parseUDP(%s): %O in %O\n",
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peeraddr,m[l],msg );
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return;
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}
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}
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}
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parseUDP(ip, port, msg) {
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dns_rresolve(ip, #'parseUDP2, ip, port, msg);
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}
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#if 0
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// in other words.. this shouldnt get called :)
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pr(mc, fmt, a,b,c,d,e,f,g,h,i,j,k) {
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D("PSYC/UDP pr("+mc+", "+S(fmt, a,b,c,d,e,f,g,h,i,j,k)+")\n");
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}
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#endif
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// no syntax error messages via udp
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croak(a,b,c,d,e,f) {}
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