src/jserver/osrf_chat.c

   1 /*
   2 Copyright (C) 2005  Georgia Public Library Service
   3 Bill Erickson <billserickson@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU General Public License
   7 as published by the Free Software Foundation; either version 2
   8 of the License, or (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14 */
  15
  16 #include "osrf_chat.h"
  17 #include <string.h>
  18 #include <stdio.h>
  19
  20 int __osrfChatXMLErrorOcurred = 0;
  21 int __osrfChatClientSentDisconnect = 0;
  22
  23 /* shorter version of strcmp */
  24 static int eq(const char* a, const char* b) { return (a && b && !strcmp(a,b)); }
  25
  26 /* gnarly debug function */
  27 static void chatdbg( osrfChatServer* server ) {
  28
  29         if(!server) return;
  30         return; /* heavy logging, should only be used in heavy debug mode */
  31
  32         growing_buffer* buf = buffer_init(256);
  33
  34         buffer_add(buf, "---------------------------------------------------------------------\n");
  35
  36         buffer_fadd(buf,
  37                 "ChopChop Debug:\n"
  38                 "Connections:           %lu\n"
  39                 "Named nodes in hash:   %lu\n"
  40                 "Domain:                %s\n"
  41                 "Port:                  %d\n"
  42                 "S2S Port:              %d\n"
  43                 "-------------------------------------------------------\n",
  44                 osrfListGetCount(server->nodeList), osrfHashGetCount(server->nodeHash),
  45                 server->domain, server->port, server->s2sport );
  46
  47         osrfListIterator* itr = osrfNewListIterator(server->nodeList);
  48         osrfChatNode* node;
  49
  50         while( (node = osrfListIteratorNext(itr)) ) {
  51
  52                 buffer_fadd( buf,
  53                         "sockid:    %d\n"
  54                         "Remote:    %s\n"
  55                         "State:     %d\n"
  56                         "XMLState:  %d\n"
  57                         "In Parse:  %d\n"
  58                         "to:        %s\n"
  59                         "Resource:  %s\n"
  60                         "Username:  %s\n"
  61                         "Domain:    %s\n"
  62                         "Authkey:   %s\n"
  63                         "type:          %d\n"
  64                         "-------------------------------------------------------\n",
  65                         node->sockid, node->remote, node->state, node->xmlstate, node->inparse,
  66                         node->to, node->resource, node->username, node->domain, node->authkey, node->type );
  67         }
  68
  69         debug_handler("DEBUG:\n%s", buf->buf );
  70         buffer_free(buf);
  71         osrfListIteratorFree(itr);
  72 }
  73
  74 osrfChatServer* osrfNewChatServer( char* domain, char* secret, int s2sport ) {
  75         if(!(domain && secret)) return NULL;
  76
  77         osrfChatServer* server = safe_malloc(sizeof(osrfChatServer));
  78
  79         server->nodeHash = osrfNewHash();
  80         server->nodeList = osrfNewList();
  81         server->deadNodes = osrfNewList();
  82         server->nodeList->freeItem = &osrfChatNodeFree;
  83         server->domain = strdup(domain);
  84         server->s2sport = s2sport;
  85
  86         server->mgr = safe_malloc(sizeof(socket_manager));
  87         server->mgr->data_received = &osrfChatHandleData;
  88         server->mgr->blob = server;
  89         server->mgr->on_socket_closed = &osrfChatSocketClosed;
  90
  91         if(secret) server->secret = strdup(secret);
  92         return server;
  93 }
  94
  95 void osrfChatCleanupClients( osrfChatServer* server ) {
  96         if(server) {
  97                 osrfListFree(server->deadNodes);
  98                 server->deadNodes = osrfNewList();
  99         }
 100 }
 101
 102
 103
 104 osrfChatNode* osrfNewChatNode( int sockid, char* domain ) {
 105         if(sockid < 1 || !domain) return NULL;
 106         osrfChatNode* node      = safe_malloc(sizeof(osrfChatNode));
 107         node->state                             = OSRF_CHAT_STATE_NONE;
 108         node->msgs                              = NULL; /* only s2s nodes cache messages */
 109         node->parserCtx         = xmlCreatePushParserCtxt(osrfChatSaxHandler, node, "", 0, NULL);
 110         node->msgDoc                    = xmlNewDoc(BAD_CAST "1.0");
 111         node->domain = strdup(domain);
 112         xmlKeepBlanksDefault(0);
 113         node->authkey                   = NULL;
 114         node->username                  = NULL;
 115         node->resource                  = NULL;
 116         node->to                                        = NULL;
 117         node->type = 0;
 118         return node;
 119 }
 120
 121
 122 osrfChatNode* osrfNewChatS2SNode( char* domain, char* remote ) {
 123         if(!(domain && remote)) return NULL;
 124         osrfChatNode* n = osrfNewChatNode( 1, domain );
 125         n->state                = OSRF_CHAT_STATE_S2S_CHALLENGE;
 126         n->sockid       = -1;
 127         n->remote       = strdup(remote);
 128         n->msgs         = osrfNewList();
 129         n->msgs->freeItem = &osrfChatS2SMessageFree;
 130         n->type = 1;
 131         return n;
 132 }
 133
 134 void osrfChatS2SMessageFree(void* n) { free(n); }
 135
 136 void osrfChatNodeFree( void* node ) {
 137         if(!node) return;
 138         osrfChatNode* n = (osrfChatNode*) node;
 139
 140         /* we can't free messages that are mid-parse because the
 141                 we can't free the parser context */
 142         if(n->inparse) {
 143                 n->inparse = 0;
 144                 osrfListPush(n->parent->deadNodes, n);
 145                 return;
 146         }
 147
 148         free(n->remote);
 149         free(n->to);
 150         free(n->username);
 151         free(n->resource);
 152         free(n->domain);
 153         free(n->authkey);
 154
 155         osrfListFree(n->msgs);
 156
 157         if(n->parserCtx) {
 158                 xmlFreeDoc(n->parserCtx->myDoc);
 159                 xmlFreeParserCtxt(n->parserCtx);
 160         }
 161
 162         xmlFreeDoc(n->msgDoc);
 163         free(n);
 164 }
 165
 166
 167
 168 int osrfChatServerConnect( osrfChatServer* cs,  int port, int s2sport, char* listenAddr ) {
 169         if(!(cs && port && listenAddr)) return -1;
 170         cs->port = port;
 171         cs->s2sport = s2sport;
 172         if( socket_open_tcp_server(cs->mgr, port, listenAddr ) < 0 )
 173                 return -1;
 174         if( socket_open_tcp_server(cs->mgr, s2sport, listenAddr ) < 0 )
 175                 return -1;
 176         return 0;
 177 }
 178
 179
 180 int osrfChatServerWait( osrfChatServer* server ) {
 181         if(!server) return -1;
 182         while(1) {
 183                 if(socket_wait_all(server->mgr, -1) < 0)
 184                         warning_handler( "jserver_wait(): socket_wait_all() returned error");
 185         }
 186         return -1;
 187 }
 188
 189
 190 void osrfChatServerFree(osrfChatServer* server ) {
 191         if(!server) return;
 192         osrfHashFree(server->nodeHash);
 193         osrfListFree(server->nodeList);
 194         free(server->mgr);
 195         free(server->secret);
 196 }
 197
 198
 199 void osrfChatHandleData( void* cs,
 200         socket_manager* mgr, int sockid, char* data, int parent_id ) {
 201
 202         if(!(cs && mgr && sockid && data)) return;
 203
 204         osrfChatServer* server = (osrfChatServer*) cs;
 205
 206         osrfChatNode* node = osrfListGetIndex( server->nodeList, sockid );
 207
 208         if(!node) {
 209                 debug_handler("Adding new connection for sockid %d", sockid );
 210                 node = osrfChatAddNode( server, sockid );
 211         }
 212
 213         if(node) {
 214                 if( (osrfChatPushData( server, node, data ) == -1) ) {
 215                         warning_handler("Node at socket %d received bad XML, disconnecting...", sockid );
 216                         osrfChatSendRaw(  node, OSRF_CHAT_PARSE_ERROR );
 217                         osrfChatRemoveNode( server, node );
 218                 }
 219         }
 220
 221         osrfChatCleanupClients(server); /* clean up old dead clients */
 222 }
 223
 224
 225 void osrfChatSocketClosed( void* blob, int sockid ) {
 226         if(!blob) return;
 227         osrfChatServer* server = (osrfChatServer*) blob;
 228         osrfChatNode* node = osrfListGetIndex(server->nodeList, sockid);
 229         osrfChatRemoveNode( server, node );
 230 }
 231
 232 osrfChatNode* osrfChatAddNode( osrfChatServer* server, int sockid ) {
 233         if(!(server && sockid)) return NULL;
 234         osrfChatNode* node = osrfNewChatNode(sockid, server->domain);
 235         node->parent = server;
 236         node->sockid = sockid;
 237         osrfListSet( server->nodeList, node, sockid );
 238         return node;
 239 }
 240
 241 void osrfChatRemoveNode( osrfChatServer* server, osrfChatNode* node ) {
 242         if(!(server && node)) return;
 243         socket_disconnect(server->mgr, node->sockid);
 244         if(node->remote)
 245                 osrfHashRemove( server->nodeHash, node->remote );
 246         osrfListRemove( server->nodeList, node->sockid ); /* this will free it */
 247 }
 248
 249 int osrfChatSendRaw( osrfChatNode* node, char* msgXML ) {
 250         if(!(node && msgXML)) return -1;
 251         return socket_send( node->sockid, msgXML );
 252 }
 253
 254
 255
 256
 257 void osrfChatNodeFinish( osrfChatServer* server, osrfChatNode* node ) {
 258         if(!(server && node)) return;
 259         osrfChatSendRaw( node, "</stream:stream>");
 260         osrfChatRemoveNode( server, node );
 261 }
 262
 263
 264 int osrfChatSend( osrfChatServer* cs, osrfChatNode* node, char* toAddr, char* fromAddr, char* msgXML ) {
 265         if(!(cs && node && toAddr && msgXML)) return -1;
 266
 267         int l = strlen(toAddr);
 268         char dombuf[l];
 269         bzero(dombuf, l);
 270         jid_get_domain( toAddr, dombuf, l );
 271
 272         if( eq( dombuf, cs->domain ) ) { /* this is to a user we host */
 273
 274                 info_handler("Sending message on local connection\nfrom: %s\nto: %s", fromAddr, toAddr );
 275                 osrfChatNode* tonode = osrfHashGet(cs->nodeHash, toAddr);
 276                 if(tonode) {
 277                         osrfChatSendRaw( tonode, msgXML );
 278
 279                 } else {
 280
 281                         /* send an error message saying we don't have this connection */
 282                         warning_handler("We have no connection for %s", toAddr);
 283                         char* xml = va_list_to_string( OSRF_CHAT_NO_RECIPIENT, toAddr, fromAddr );
 284                         osrfChatSendRaw( node, xml );
 285                         free(xml);
 286                 }
 287
 288         } else {
 289
 290                 osrfChatNode* tonode = osrfHashGet(cs->nodeHash, dombuf);
 291                 if(tonode) {
 292                         if( tonode->state == OSRF_CHAT_STATE_CONNECTED ) {
 293                                 debug_handler("Routing message to server %s", dombuf);
 294                                 osrfChatSendRaw( tonode, msgXML );
 295
 296                         } else {
 297                                 info_handler("Received s2s message and we're still trying to connect...caching");
 298                                 osrfListPush( tonode->msgs, strdup(msgXML) );
 299                         }
 300
 301                 } else {
 302
 303                         if( osrfChatInitS2S( cs, dombuf, toAddr, msgXML ) != 0 ) {
 304                                 warning_handler("We are unable to connect to remote server %s for recipient %s", dombuf, toAddr);
 305                                 char* xml = va_list_to_string( OSRF_CHAT_NO_RECIPIENT, toAddr, fromAddr );
 306                                 osrfChatSendRaw( node, xml );
 307                                 free(xml);
 308                         }
 309                 }
 310         }
 311
 312         return 0;
 313 }
 314
 315
 316 /*
 317 void osrfChatCacheS2SMessage( char* toAddr, char* msgXML, osrfChatNode* snode ) {
 318         if(!(toAddr && msgXML)) return;
 319         osrfChatS2SMessage* msg = safe_malloc(sizeof(osrfChatS2SMessage));
 320         msg->toAddr = strdup(toAddr);
 321         msg->msgXML = strdup(msgXML);
 322         info_handler("Pushing client message onto s2s queue waiting for connect... ");
 323         osrfListPush( snode->msgs, msgXML );
 324 }
 325 */
 326
 327
 328 int osrfChatInitS2S( osrfChatServer* cs, char* remote, char* toAddr, char* msgXML ) {
 329         if(!(cs && remote && toAddr && msgXML)) return -1;
 330
 331         info_handler("Initing server2server connection to domain %s", remote );
 332         osrfChatNode* snode = osrfNewChatS2SNode( cs->domain, remote );
 333         snode->parent = cs;
 334
 335         /* try to connect to the remote site */
 336         snode->sockid = socket_open_tcp_client(cs->mgr, cs->s2sport, remote);
 337         if(snode->sockid < 1) {
 338                 warning_handler("Unable to connect to remote server at %s", remote );
 339                 return -1;
 340         }
 341
 342         /* store the message we were supposed to deliver until we're fully connected */
 343         //osrfChatCacheS2SMessage( toAddr, msgXML, snode );
 344         osrfListPush( snode->msgs, strdup(msgXML) );
 345         osrfHashSet(cs->nodeHash, snode, remote );
 346         osrfListSet(cs->nodeList, snode, snode->sockid );
 347
 348         /* send the initial s2s request */
 349         osrfChatSendRaw( snode, OSRF_CHAT_S2S_INIT );
 350
 351         debug_handler("Added new s2s node...");
 352         chatdbg(cs);
 353
 354         return 0;
 355 }
 356
 357
 358 /* commence SAX handling code */
 359
 360 int osrfChatPushData( osrfChatServer* server, osrfChatNode* node, char* data ) {
 361         if(!(node && data)) return -1;
 362
 363         chatdbg(server);
 364
 365         debug_handler("pushing data into xml parser for node %d:\n%s", node->sockid, data);
 366         node->inparse = 1;
 367         xmlParseChunk(node->parserCtx, data, strlen(data), 0);
 368         node->inparse = 0;
 369
 370         if(__osrfChatXMLErrorOcurred) {
 371                 __osrfChatXMLErrorOcurred = 0;
 372                 return -1;
 373         }
 374
 375         /* we can't do cleanup of the XML handlers while in the middle of a
 376                 data push, so set flags in the data push and doe the cleanup here */
 377         /*
 378         if(__osrfChatClientSentDisconnect) {
 379                 __osrfChatClientSentDisconnect  = 0;
 380                 osrfChatNodeFinish( server, node );
 381         }
 382         */
 383
 384         return 0;
 385 }
 386
 387
 388 void osrfChatStartStream( void* blob ) {
 389         debug_handler("Starting new client stream...");
 390 }
 391
 392
 393 void osrfChatStartElement( void* blob, const xmlChar *name, const xmlChar **atts ) {
 394         if(!(blob && name)) return;
 395         osrfChatNode* node = (osrfChatNode*) blob;
 396
 397         int status = -1;
 398         char* nm = (char*) name;
 399
 400         debug_handler("Starting element %s with namespace %s", nm, xmlSaxAttr(atts, "xmlns") );
 401
 402         switch( node->state ) {
 403
 404                 case OSRF_CHAT_STATE_NONE:
 405                         status = osrfChatHandleNewConnection( node, nm, atts );
 406                         break;
 407
 408                 case OSRF_CHAT_STATE_CONNECTING:
 409                         status = osrfChatHandleConnecting( node, nm, atts );
 410                         break;
 411
 412                 case OSRF_CHAT_STATE_CONNECTED:
 413                         status = osrfChatHandleConnected( node, nm, atts );
 414                         break;
 415
 416                 case OSRF_CHAT_STATE_S2S_CHALLENGE:
 417                         status = osrfChatHandleS2SChallenge( node, nm, atts );
 418                         break;
 419
 420                 case OSRF_CHAT_STATE_S2S_RESPONSE: /* server waiting for client response to challenge */
 421                         if(eq(nm, "db:result")) {
 422                                 char* remote = xmlSaxAttr(atts, "from");
 423                                 if(remote) node->remote = strdup(remote); /* copy off the client's id */
 424                                 status = 0;
 425                                 node->xmlstate |= OSRF_CHAT_STATE_INS2SRESULT;
 426                         } else status = -1;
 427                         break;
 428
 429                 case OSRF_CHAT_STATE_S2S_VERIFY:        /* client : waiting for server verify message */
 430                         if(eq(nm, "db:verify")) {
 431                                 char* id = xmlSaxAttr( atts, "id" );
 432                                 if(id) {
 433                                         char* xml = va_list_to_string( OSRF_CHAT_S2S_VERIFY_RESPONSE,
 434                                                         node->remote, node->domain, id );
 435                                         osrfChatSendRaw( node, xml );
 436                                         free(xml);
 437                                         node->state = OSRF_CHAT_STATE_S2S_VERIFY_FINAL;
 438                                         status = 0;
 439                                 }
 440                         }
 441                         break;
 442
 443                 case OSRF_CHAT_STATE_S2S_VERIFY_RESPONSE:       /* server waiting for client verify response */
 444                 case OSRF_CHAT_STATE_S2S_VERIFY_FINAL: /* client waitig for final verify */
 445                         status = osrfChatHandleS2SConnected( node, nm, atts );
 446                         break;
 447
 448         }
 449
 450         if(status != 0)
 451                 osrfChatParseError( node, "We don't know how to handle the XML data received" );
 452 }
 453
 454 #define CHAT_CHECK_VARS(x,y,z) if(!(x && y)) return -1; if(z) debug_handler(z);
 455
 456
 457
 458 int osrfChatHandleS2SConnected( osrfChatNode* node, const char* name, const xmlChar**atts ) {
 459         CHAT_CHECK_VARS(node, name, "osrfChatHandleS2SConnected" );
 460
 461         int status = -1;
 462
 463         if(eq(name,"db:verify")) { /* server receives verify from client */
 464                 char* xml = va_list_to_string(OSRF_CHAT_S2S_VERIFY_FINAL, node->domain, node->remote );
 465                 osrfChatSendRaw(node, xml );
 466                 free(xml);
 467                 status = 0;
 468         }
 469
 470         if(eq(name, "db:result")) {
 471                 /* send all the messages that we have queued for this server */
 472                 node->state = OSRF_CHAT_STATE_CONNECTED;
 473                 osrfListIterator* itr = osrfNewListIterator(node->msgs);
 474
 475                 char* xml;
 476                 while( (xml = (char*) osrfListIteratorNext(itr)) ) {
 477                         xmlDocPtr doc = xmlParseMemory(xml, strlen(xml));
 478                         if(doc) {
 479                                 char* from = (char*) xmlGetProp(xmlDocGetRootElement(doc), BAD_CAST "from");
 480                                 char* to = (char*) xmlGetProp(xmlDocGetRootElement(doc), BAD_CAST "to");
 481                                 osrfChatSend( node->parent, node, to, from, xml );
 482                                 debug_handler("Sending cached message from %s to %s", from, to);
 483                                 xmlFree(to); xmlFree(from);
 484                                 xmlFreeDoc(doc);
 485                         }
 486                 }
 487
 488                 osrfListIteratorFree(itr);
 489                 osrfListFree(node->msgs);
 490                 node->msgs = NULL;
 491                 status = 0;
 492         }
 493
 494         if(status == 0) {
 495                 info_handler("Successfully made S2S connection to %s", node->remote );
 496                 node->state = OSRF_CHAT_STATE_CONNECTED;
 497                 node->xmlstate = 0;
 498         }
 499
 500         return status;
 501 }
 502
 503
 504 /** check the namespace of the stream message to see if it's a server or client connection */
 505 int osrfChatHandleNewConnection( osrfChatNode* node, const char* name, const xmlChar** atts ) {
 506         CHAT_CHECK_VARS(node, name, "osrfChatHandleNewConnection()");
 507
 508         if(!eq(name, "stream:stream")) return -1;
 509
 510         node->authkey = osrfChatMkAuthKey();
 511         char* ns = xmlSaxAttr(atts, "xmlns");
 512         if(!ns) return -1;
 513
 514         if(eq(ns, "jabber:client")) { /* client connection */
 515
 516                 char* domain = xmlSaxAttr( atts, "to" );
 517                 if(!domain) return -1;
 518
 519                 if(!eq(domain, node->domain)) {
 520                         warning_handler("Client attempting to connect to invalid domain");
 521                         return -1;
 522                 }
 523
 524                 char* buf = va_list_to_string( OSRF_CHAT_START_STREAM, domain, node->authkey );
 525                 node->state = OSRF_CHAT_STATE_CONNECTING;
 526
 527                 debug_handler("Server responding to connect message with\n%s\n", buf );
 528                 osrfChatSendRaw( node, buf );
 529                 free(buf);
 530                 return 0;
 531         }
 532
 533         /* server to server init */
 534         if(eq(ns, "jabber:server")) { /* client connection */
 535                 info_handler("We received a new server 2 server connection, generating auth key...");
 536                 char* xml = va_list_to_string( OSRF_CHAT_S2S_CHALLENGE, node->authkey );
 537                 osrfChatSendRaw( node, xml );
 538                 free(xml);
 539                 node->state = OSRF_CHAT_STATE_S2S_RESPONSE; /* the next message should be the response */
 540                 node->type = 1;
 541                 return 0;
 542         }
 543
 544         return -1;
 545 }
 546
 547
 548
 549 char* osrfChatMkAuthKey() {
 550         char keybuf[112];
 551         bzero(keybuf, 112);
 552         snprintf(keybuf, 111, "%d%d%s", (int) time(NULL), getpid(), getenv("HOSTNAME"));
 553         return strdup(shahash(keybuf));
 554 }
 555
 556 int osrfChatHandleConnecting( osrfChatNode* node, const char* name, const xmlChar** atts ) {
 557         CHAT_CHECK_VARS(node, name, "osrfChatHandleConnecting()");
 558         debug_handler("Handling connect node %s", name );
 559
 560         if(eq(name, "iq")) node->xmlstate |= OSRF_CHAT_STATE_INIQ;
 561         else if(eq(name,"username")) node->xmlstate |= OSRF_CHAT_STATE_INUSERNAME;
 562         else if(eq(name,"resource")) node->xmlstate |= OSRF_CHAT_STATE_INRESOURCE;
 563         return 0;
 564 }
 565
 566 int osrfChatHandleConnected( osrfChatNode* node, const char* name, const xmlChar** atts ) {
 567         CHAT_CHECK_VARS(node, name, "osrfChatHandleConnected()");
 568
 569         if(eq(name,"message")) {
 570
 571                 /* drop the old message and start with a new one */
 572                 xmlNodePtr root = xmlNewNode(NULL, name);
 573                 xmlAddAttrs(root, atts);
 574                 xmlNodePtr oldRoot = xmlDocSetRootElement(node->msgDoc, root);
 575                 free(node->to);
 576
 577                 char* to = xmlSaxAttr(atts, "to");
 578                 if(!to) to = "";
 579
 580                 node->to = strdup(to);
 581                 if(oldRoot) xmlFreeNode(oldRoot);
 582                 node->xmlstate = OSRF_CHAT_STATE_INMESSAGE;
 583
 584         } else {
 585
 586                 /* all non "message" nodes are simply added to the message */
 587                 xmlNodePtr nodep = xmlNewNode(NULL, name);
 588                 xmlAddAttrs(nodep, atts);
 589                 xmlAddChild(xmlDocGetRootElement(node->msgDoc), nodep);
 590         }
 591
 592         return 0;
 593 }
 594
 595 /* takes s2s secret, hashdomain, and the s2s auth token */
 596 static char* osrfChatGenerateS2SKey( char* secret, char* hashdomain, char* authtoken ) {
 597         if(!(secret && hashdomain && authtoken)) return NULL;
 598         info_handler("Generating s2s key with auth token: %s", authtoken );
 599         char* a = shahash(secret);
 600         debug_handler("S2S secret hash: %s", a);
 601         char* b = va_list_to_string("%s%s", a, hashdomain);
 602         char* c = shahash(b);
 603         debug_handler("S2S intermediate hash: %s", c);
 604         char* d = va_list_to_string("%s%s", c, authtoken);
 605         char* e = strdup(shahash(d));
 606         free(b); free(d);
 607         return e;
 608 }
 609
 610 int osrfChatHandleS2SChallenge( osrfChatNode* node, const char* name, const xmlChar** atts ) {
 611         CHAT_CHECK_VARS(node, name, "osrfChatHandleS2SChallenge()");
 612
 613 /* here we respond to the stream challenge */
 614         if(eq(name, "stream:stream")) {
 615                 char* id = xmlSaxAttr(atts, "id");
 616                 if(id) {
 617                         /* we use our domain in the s2s challenge hash */
 618                         char* d = osrfChatGenerateS2SKey(node->parent->secret, node->domain, id );
 619                         char* e = va_list_to_string(OSRF_CHAT_S2S_RESPONSE, node->remote, node->domain, d );
 620                         info_handler("Answering s2s challenge with key:  %s", e );
 621                         osrfChatSendRaw( node, e );
 622                         free(d); free(e);
 623                         node->state = OSRF_CHAT_STATE_S2S_VERIFY;
 624                         return 0;
 625                 }
 626         }
 627
 628         return -1;
 629 }
 630
 631 /*
 632 int osrfChatHandleS2SResponse( osrfChatNode* node, const char* name, const xmlChar** atts ) {
 633         CHAT_CHECK_VARS(node, name, "osrfChatHandleS2SResponse()");
 634
 635         if(eq(name, "db:result")) {
 636                 node->xmlstate |= OSRF_CHAT_STATE_INS2SRESULT;
 637                 return 0;
 638         }
 639
 640         return -1;
 641 }
 642 */
 643
 644
 645
 646 void osrfChatEndElement( void* blob, const xmlChar* name ) {
 647         if(!(blob && name)) return;
 648         osrfChatNode* node = (osrfChatNode*) blob;
 649
 650         char* nm = (char*) name;
 651
 652         if(eq(nm,"stream:stream")) {
 653                 osrfChatNodeFinish( node->parent, node );
 654                 return;
 655         }
 656
 657         if( node->state == OSRF_CHAT_STATE_CONNECTED ) {
 658                 if(eq(nm, "message")) {
 659
 660                         xmlNodePtr msg = xmlDocGetRootElement(node->msgDoc);
 661                         if(msg && node->type == 0)
 662                                 xmlSetProp(msg, BAD_CAST "from", BAD_CAST node->remote );
 663                         char* string = xmlDocToString(node->msgDoc, 0 );
 664
 665                         char* from = (char*) xmlGetProp(msg, BAD_CAST "from");
 666                         debug_handler( "Routing message to %s\n%s\n", node->to, from, string );
 667                         osrfChatSend( node->parent, node, node->to, from, string );
 668                         xmlFree(from);
 669                         free(string);
 670                 }
 671         }
 672
 673         if( node->state == OSRF_CHAT_STATE_CONNECTING ) {
 674                 if( node->xmlstate & OSRF_CHAT_STATE_INIQ ) {
 675
 676                         if(eq(nm, "iq")) {
 677                                 node->xmlstate &= ~OSRF_CHAT_STATE_INIQ;
 678                                 node->remote = va_list_to_string(
 679                                                 "%s@%s/%s", node->username, node->domain, node->resource );
 680
 681                                 info_handler("%s successfully logged in", node->remote );
 682
 683                                 debug_handler("Setting remote address to %s", node->remote );
 684                                 osrfChatSendRaw( node, OSRF_CHAT_LOGIN_OK );
 685                                 osrfHashSet( node->parent->nodeHash, node, node->remote );
 686                                 node->state = OSRF_CHAT_STATE_CONNECTED;
 687                         }
 688                 }
 689         }
 690 }
 691
 692
 693 void osrfChatHandleCharacter( void* blob, const xmlChar *ch, int len) {
 694         if(!(blob && ch && len)) return;
 695         osrfChatNode* node = (osrfChatNode*) blob;
 696
 697         /*
 698         debug_handler("Char Handler: state %d, xmlstate %d, chardata %s",
 699                         node->state, node->xmlstate, (char*) ch );
 700                         */
 701
 702         if( node->state == OSRF_CHAT_STATE_CONNECTING ) {
 703                 if( node->xmlstate & OSRF_CHAT_STATE_INIQ ) {
 704
 705                         if( node->xmlstate & OSRF_CHAT_STATE_INUSERNAME ) {
 706                                 free(node->username);
 707                                 node->username = strndup((char*) ch, len);
 708                                 node->xmlstate &= ~OSRF_CHAT_STATE_INUSERNAME;
 709                         }
 710
 711                         if( node->xmlstate & OSRF_CHAT_STATE_INRESOURCE ) {
 712                                 free(node->resource);
 713                                 node->resource = strndup((char*) ch, len);
 714                                 node->xmlstate &= ~OSRF_CHAT_STATE_INRESOURCE;
 715                         }
 716                 }
 717
 718                 return;
 719         }
 720
 721         if( node->state == OSRF_CHAT_STATE_CONNECTED ) {
 722                 xmlNodePtr last = xmlGetLastChild(xmlDocGetRootElement(node->msgDoc));
 723                 xmlNodePtr txt = xmlNewTextLen(ch, len);
 724                 xmlAddChild(last, txt);
 725                 return;
 726         }
 727
 728         if( node->state == OSRF_CHAT_STATE_S2S_RESPONSE &&
 729                         (node->xmlstate & OSRF_CHAT_STATE_INS2SRESULT) ) {
 730
 731                 char* key = strndup((char*) ch, len);
 732                 debug_handler("Got s2s key from %s : %s", node->remote, key );
 733                 char* e = osrfChatGenerateS2SKey(node->parent->secret, node->remote, node->authkey );
 734                 info_handler("\nReceived s2s key from server: %s\nKey should be: %s", key, e );
 735
 736                 if(eq(key, e)) {
 737                         char* msg = va_list_to_string(OSRF_CHAT_S2S_VERIFY_REQUEST,
 738                                         node->authkey, node->domain, node->remote, e );
 739                         osrfChatSendRaw(node, msg );
 740                         free(msg);
 741                         node->state = OSRF_CHAT_STATE_S2S_VERIFY_RESPONSE;
 742                         node->xmlstate = 0;
 743
 744                 } else {
 745                         warning_handler("Server2Server keys do not match!");
 746                 }
 747
 748                 /* do the hash dance again */
 749         }
 750
 751 }
 752
 753
 754 void osrfChatParseError( void* blob, const char* msg, ... ) {
 755
 756         __osrfChatXMLErrorOcurred = 1;
 757 }
 758
 759
 760
 761