src/iop.c

   1 /**************************************************************************/
   2 /* ---------------------------------------------------------------------- */
   3 /* Copyright (C) 2006 - 2008 FRESCOR consortium partners:                 */
   4 /*                                                                        */
   5 /*   Universidad de Cantabria,              SPAIN                         */
   6 /*   University of York,                    UK                            */
   7 /*   Scuola Superiore Sant'Anna,            ITALY                         */
   8 /*   Kaiserslautern University,             GERMANY                       */
   9 /*   Univ. Politécnica  Valencia,           SPAIN                        */
  10 /*   Czech Technical University in Prague,  CZECH REPUBLIC                */
  11 /*   ENEA                                   SWEDEN                        */
  12 /*   Thales Communication S.A.              FRANCE                        */
  13 /*   Visual Tools S.A.                      SPAIN                         */
  14 /*   Rapita Systems Ltd                     UK                            */
  15 /*   Evidence                               ITALY                         */
  16 /*                                                                        */
  17 /*   See http://www.frescor.org for a link to partners' websites          */
  18 /*                                                                        */
  19 /*          FRESCOR project (FP6/2005/IST/5-034026) is funded             */
  20 /*       in part by the European Union Sixth Framework Programme          */
  21 /*       The European Union is not liable of any use that may be          */
  22 /*       made of this code.                                               */
  23 /*                                                                        */
  24 /*                                                                        */
  25 /*  This file is part of FORB (Frescor Object Request Broker)             */
  26 /*                                                                        */
  27 /* FORB is free software; you can redistribute it and/or modify it        */
  28 /* under terms of the GNU General Public License as published by the      */
  29 /* Free Software Foundation; either version 2, or (at your option) any    */
  30 /* later version.  FORB is distributed in the hope that it will be        */
  31 /* useful, but WITHOUT ANY WARRANTY; without even the implied warranty    */
  32 /* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU    */
  33 /* General Public License for more details. You should have received a    */
  34 /* copy of the GNU General Public License along with FORB; see file       */
  35 /* COPYING. If not, write to the Free Software Foundation, 675 Mass Ave,  */
  36 /* Cambridge, MA 02139, USA.                                              */
  37 /*                                                                        */
  38 /* As a special exception, including FORB header files in a file,         */
  39 /* instantiating FORB generics or templates, or linking other files       */
  40 /* with FORB objects to produce an executable application, does not       */
  41 /* by itself cause the resulting executable application to be covered     */
  42 /* by the GNU General Public License. This exception does not             */
  43 /* however invalidate any other reasons why the executable file might be  */
  44 /* covered by the GNU Public License.                                     */
  45 /**************************************************************************/
  46
  47 /**
  48  * @file   iop.c
  49  * @author Michal Sojka <sojkam1@fel.cvut.cz>
  50  * @date   Mon Sep  1 21:51:58 2008
  51  *
  52  * @brief  Implementation of Inter-ORB protocol.
  53  *
  54  *
  55  */
  56 #include "iop.h"
  57 #include <forb/cdr.h>
  58 #include <forb/object.h>
  59 #include "proto.h"
  60 #include <ul_log.h>
  61 #include "exec_req.h"
  62 #include <errno.h>
  63 #include "peer.h"
  64 #include "discovery.h"
  65
  66 /** Version of the protocol */
  67 #define VER_MAJOR 0
  68 #define VER_MINOR 0
  69
  70 #define VER(major, minor) ((major)<<8 || (minor))
  71
  72 extern UL_LOG_CUST(ulogd_forb_iop);
  73
  74
  75 CORBA_boolean
  76 forb_iop_prepend_message_header(FORB_CDR_Codec *codec, forb_iop_message_type mt)
  77 {
  78         CORBA_boolean ret;
  79         forb_iop_message_header mh;
  80         mh.proto_version.major = VER_MAJOR;
  81         mh.proto_version.minor = VER_MINOR;
  82         mh.message_type = mt;
  83         mh.flags = (codec->data_endian == LittleEndian) ? forb_iop_LITTLE_ENDIAN : 0;
  84         mh.message_size = FORB_CDR_data_size(codec);
  85         ret = FORB_CDR_buffer_prepend(codec, forb_iop_MESSAGE_HEADER_SIZE);
  86         if (ret) {
  87                 ret = forb_iop_message_header_serialize(codec, &mh);
  88         }
  89         return ret;
  90 }
  91
  92 CORBA_boolean
  93 forb_iop_prepare_request(forb_request_t *req,
  94                          char *iface,
  95                          unsigned method_ind,
  96                          CORBA_Environment *env)
  97 {
  98         CORBA_boolean ret;
  99         forb_iop_request_header rh;
 100
 101         rh.request_id = req->request_id;
 102         rh.iface = iface;
 103         rh.objkey = forb_object_to_key(req->obj);
 104         rh.method_index = method_ind;
 105         rh.source = forb_object_to_forb(req->obj)->server_id;
 106         ret = forb_iop_request_header_serialize(&req->cdr_request, &rh);
 107         if (ret) {
 108                 /* Request body is 8 byte aligned */
 109                 ret = FORB_CDR_put_align(&req->cdr_request, 8);
 110                 char str[50];
 111                 ul_logdeb("preparing request: id=%d  dest=%s  iface=%s method=%d\n", req->request_id,
 112                           forb_server_id_to_string(str, &req->obj->server, sizeof(str)),
 113                           iface, method_ind);
 114         }
 115         return ret;
 116 }
 117
 118 static CORBA_boolean
 119 forb_iop_prepare_hello(FORB_CDR_Codec *codec,
 120                        const forb_server_id *server_id,
 121                        const void *src_addr,
 122                        CORBA_boolean (*serialize_addr)(FORB_CDR_Codec *codec, const void *addr),
 123                        const CORBA_char *orb_id)
 124 {
 125         if (!forb_server_id_serialize(codec, server_id)) return CORBA_FALSE;
 126         if (serialize_addr) {
 127                 if (!serialize_addr(codec, src_addr)) return CORBA_FALSE;
 128         }
 129         if (!CORBA_string_serialize(codec, &orb_id)) return CORBA_FALSE;
 130         /* All headers must be 8 byte aligned so align the length of
 131          * this message */
 132         if (!FORB_CDR_put_align(codec, 8)) return CORBA_FALSE;
 133         if (!forb_iop_prepend_message_header(codec, forb_iop_HELLO)) return CORBA_FALSE;
 134         return CORBA_TRUE;
 135 }
 136
 137 int forb_iop_send_hello_to(forb_peer_t *peer)
 138 {
 139         forb_port_t *port = peer->port;
 140         FORB_CDR_Codec codec;
 141         int ret;
 142         FORB_CDR_codec_init_static(&codec, port->forb->orb);
 143         if (!FORB_CDR_buffer_init(&codec, 1024, 0))
 144                 return -1;
 145         if (!FORB_CDR_buffer_reset(&codec, forb_iop_MESSAGE_HEADER_SIZE)) {
 146                 ret = -1;
 147                 goto free;
 148         }
 149         if (!forb_iop_prepare_hello(&codec, &port->forb->server_id,
 150                                     port->desc.addr,
 151                                     port->desc.proto->serialize_addr,
 152                                     port->forb->attr.orb_id)) {
 153                 ret = -1;
 154                 goto free;
 155         }
 156         ret = forb_proto_send(peer, &codec);
 157         if (ret > 0) ret = 0;
 158 free:
 159         FORB_CDR_codec_release_buffer(&codec);
 160         return ret;
 161 }
 162
 163 bool
 164 forb_iop_process_message_header(forb_iop_message_header *mh, FORB_CDR_Codec *codec)
 165 {
 166         /* FIXME: If we have multiple protocol versions, use different
 167          * type (independent from version) for return value instead of
 168          * mh */
 169         forb_iop_version_deserialize(codec, &mh->proto_version);
 170         switch (VER(mh->proto_version.major, mh->proto_version.minor)) {
 171                 case VER(VER_MAJOR, VER_MINOR):
 172                         forb_iop_message_type_deserialize(codec, &mh->message_type);
 173                         forb_iop_message_flags_deserialize(codec, &mh->flags);
 174                         /* Check whwther the type is meaningfull */
 175                         switch (mh->message_type) {
 176                                 case forb_iop_REQUEST:
 177                                 case forb_iop_REPLY:
 178                                 case forb_iop_HELLO:
 179                                         break;
 180                                 default:
 181                                         ul_logerr("rcvd wrong message type: %d\n",
 182                                                   mh->message_type);
 183                                         return false;
 184                         }
 185                         codec->data_endian = (mh->flags && forb_iop_LITTLE_ENDIAN) ?
 186                                 LittleEndian : BigEndian;
 187                         CORBA_unsigned_long_deserialize(codec, &mh->message_size);
 188                         return true;
 189                         break;
 190                 default:
 191                         ul_logerr("rcvd wrong protocol versio: %d.%d\n",
 192                                   mh->proto_version.major, mh->proto_version.minor);
 193                         return false;
 194         }
 195 }
 196
 197 static inline CORBA_boolean
 198 forb_exception_serialize(FORB_CDR_Codec *codec, struct forb_env *env)
 199 {
 200         return CORBA_long_serialize(codec, &env->major);
 201 }
 202
 203 static inline CORBA_boolean
 204 forb_exception_deserialize(FORB_CDR_Codec *codec, struct forb_env *env)
 205 {
 206         /* TODO: Declare exceptions in IDL and don't typecast here. */
 207         return CORBA_long_deserialize(codec, (CORBA_long*)&env->major);
 208 }
 209
 210 void
 211 forb_iop_send_reply(forb_t *forb,
 212            forb_server_id *dest,
 213            FORB_CDR_Codec *codec,
 214            CORBA_long request_id,
 215            struct forb_env *env)
 216 {
 217         forb_iop_reply_header reply_header;
 218         CORBA_boolean ret;
 219         forb_peer_t *peer;
 220         fosa_abs_time_t timeout;
 221
 222         reply_header.request_id = request_id;
 223         reply_header.flags = 0;
 224         if (forb_exception_occurred(env)) {
 225                 reply_header.flags |= forb_iop_FLAG_EXCEPTION;
 226                 FORB_CDR_buffer_reset(codec, forb_iop_MESSAGE_HEADER_SIZE +
 227                                              forb_iop_REPLY_HEADER_SIZE);
 228                 forb_exception_serialize(codec, env);
 229         }
 230         /* All headers must be 8 byte aligned so align the length of
 231          * this message */
 232         if (!FORB_CDR_put_align(codec, 8)) {
 233                 ul_logerr("Not enough space for tail align\n");
 234                 return;         /* FIXME: handle error (goto above)*/
 235         }
 236         /* forb_iop_REPLY_HEADER_SIZE equals to 8 even if the real
 237          * header is shorter. We want reply data to be 8 byte
 238          * aligned */
 239         ret = FORB_CDR_buffer_prepend(codec, forb_iop_REPLY_HEADER_SIZE);
 240         if (!ret) {
 241                 goto err;
 242         }
 243         ret = forb_iop_reply_header_serialize(codec, &reply_header);
 244         if (!ret) {
 245                 goto err;
 246         }
 247         forb_iop_prepend_message_header(codec, forb_iop_REPLY);
 248
 249         fosa_clock_get_time(FOSA_CLOCK_ABSOLUTE, &timeout);
 250         timeout = fosa_abs_time_incr(timeout,
 251                                      fosa_msec_to_rel_time(1000));
 252
 253         peer = forb_get_next_hop(forb, dest, &timeout);
 254         if (!peer) {
 255                 char str[60];
 256                 forb_server_id_to_string(str, dest, sizeof(str));
 257                 ul_logerr("Reply destination not found: %s\n", str);
 258                 goto err;
 259         } else {
 260                 char str[60];
 261                 forb_server_id_to_string(str, dest, sizeof(str));
 262                 ul_logdeb("sending reply: dest=%s, id=%u\n", str, request_id);
 263         }
 264         forb_proto_send(peer, codec);
 265         forb_peer_put(peer);
 266 err:
 267         ;
 268 }
 269
 270 static void
 271 process_request(forb_port_t *port, FORB_CDR_Codec *codec, uint32_t message_size)
 272 {
 273         forb_iop_request_header request_header;
 274         CORBA_boolean ret;
 275         forb_object obj;
 276         size_t n;
 277         forb_t *forb = port->forb;
 278         struct forb_env env;
 279         FORB_CDR_Codec reply_codec;
 280         forb_exec_req_t *exec_req;
 281         uint32_t req_size, data_size, header_size;
 282         char str[32];
 283         forb_peer_t *peer;
 284
 285         data_size = FORB_CDR_data_size(codec);
 286         ret = forb_iop_request_header_deserialize(codec, &request_header);
 287         if (!ret) {
 288                 ul_logerr("Malformed request recevied\n");
 289                 env.major = FORB_EX_COMM_FAILURE;
 290                 goto out;
 291         }
 292         ret = FORB_CDR_get_align(codec, 8);
 293         if (!ret) {
 294                 ul_logerr("Malformed request recevied\n");
 295                 env.major = FORB_EX_COMM_FAILURE;
 296                 goto out;
 297         }
 298
 299         header_size = data_size - FORB_CDR_data_size(codec);
 300         req_size = message_size - header_size;
 301
 302         ul_logdeb("rcvd request: src=%s, id=%u, iface=%s, method=%hd\n",
 303                   forb_server_id_to_string(str, &request_header.source, sizeof(str)),
 304                   request_header.request_id,
 305                   request_header.iface,
 306                   request_header.method_index);
 307
 308         if (port->new_peer) {
 309                 /* Request from a new peer was reported by the underlaying protocol */
 310                 peer = forb_peer_find(port->forb, &request_header.source);
 311                 if (peer) {
 312                         /* We already know this peer */
 313                         /* TODO: Can it be in FORB_PEER_WANTED state?
 314                          * If yes, we cannot simply igore this. */
 315                         ul_logmsg("new_peer was already known\n");
 316                         forb_peer_put(port->new_peer);
 317                         port->new_peer = NULL;
 318                 } else {
 319                         ul_logdeb("discovered new_peer from incomming connection\n");
 320                         peer = port->new_peer;
 321                         port->new_peer = NULL;
 322                         forb_new_peer_discovered(port, peer, request_header.source,
 323                                                  peer->addr, peer->orb_id);
 324                 }
 325
 326         }
 327
 328         obj = forb_key_to_object(forb, request_header.objkey);
 329         if (!obj) {
 330                 ul_logerr("Nonexistent object key\n");
 331                 env.major = FORB_EX_OBJECT_NOT_EXIST;
 332                 goto send_execption;
 333         }
 334
 335         n = strlen(request_header.iface);
 336         ret = strncmp(request_header.iface, obj->interface->name, n);
 337         forb_free(request_header.iface);
 338         request_header.iface = NULL;
 339         if (ret != 0) {
 340                 env.major = FORB_EX_INV_OBJREF;
 341                 ul_logerr("Object reference has incorrect type\n");
 342                 goto send_execption;
 343         }
 344
 345         if (request_header.method_index >= obj->interface->num_methods) {
 346                 env.major = FORB_EX_INV_IDENT;
 347                 ul_logerr("To high method number\n");
 348                 goto send_execption;
 349         }
 350
 351         if (!obj->executor) {
 352                 env.major = FORB_EX_NO_IMPLEMENT;
 353                 ul_logerr("No executor for object\n");
 354                 goto send_execption;
 355
 356         }
 357
 358         /* Enqueue execution request */
 359         exec_req = forb_malloc(sizeof(*exec_req));
 360         if (exec_req) {
 361                 memset(exec_req, 0, sizeof(exec_req));
 362                 exec_req->request_id = request_header.request_id;
 363                 exec_req->source = request_header.source;
 364                 exec_req->obj = obj;
 365                 exec_req->method_index = request_header.method_index;
 366                 /* Copy the request to exec_req */
 367                 FORB_CDR_codec_init_static(&exec_req->codec, codec->orb);
 368                 ret = FORB_CDR_buffer_init(&exec_req->codec,
 369                                       req_size,
 370                                       0);
 371                 if (!ret) {
 372                         env.major = FORB_EX_NO_MEMORY;
 373                         ul_logerr("No memory for executor request bufer of size %d (header_size=%d)\n",
 374                                   req_size, header_size);
 375                         goto send_execption;
 376                 }
 377                 exec_req->codec.data_endian = codec->data_endian;
 378                 FORB_CDR_buffer_gets(codec, exec_req->codec.buffer, req_size);
 379                 /* TODO: Use better data structure for incomming
 380                    buffer to achieve zero-copy behaviour. */
 381                 forb_exec_req_ins_tail(obj->executor, exec_req);
 382         } else {
 383                 env.major = FORB_EX_NO_MEMORY;
 384                 ul_logerr("No memory for executor request\n");
 385                 goto send_execption;
 386         }
 387
 388 out:
 389         return;
 390
 391 send_execption:
 392         FORB_CDR_codec_init_static(&reply_codec, codec->orb);
 393         ret = FORB_CDR_buffer_init(&reply_codec, 4096,
 394                               forb_iop_MESSAGE_HEADER_SIZE +
 395                               forb_iop_REPLY_HEADER_SIZE);
 396         if (!ret) {
 397                 ul_logerr("No memory for exception reply buffer\n");
 398                 return;
 399         }
 400
 401         forb_iop_send_reply(port->forb, &request_header.source,
 402                             &reply_codec, request_header.request_id, &env);
 403         FORB_CDR_codec_release_buffer(&reply_codec);
 404         /* TODO: relese exec_req etc. */
 405 }
 406
 407 static void
 408 process_reply(forb_port_t *port, FORB_CDR_Codec *codec)
 409 {
 410         forb_iop_reply_header rh;
 411         forb_t *forb = port->forb;
 412         forb_request_t *req;
 413
 414         forb_iop_reply_header_deserialize(codec, &rh);
 415         /* Reply data are 8 byte aligned */
 416         FORB_CDR_get_align(codec, 8);
 417         ul_logdeb("rcvd reply: id=%u\n", rh.request_id);
 418         req = forb_request_find(forb, &rh.request_id);
 419         if (!req) {
 420                 ul_logerr("Received reply to unknown request_id %u\n", rh.request_id);
 421                 return;
 422         }
 423         forb_request_delete(forb, req); /* Deregister request from forb */
 424
 425         if (rh.flags & forb_iop_FLAG_EXCEPTION) {
 426                 forb_exception_deserialize(codec, req->env);
 427         } else {
 428                 req->cdr_reply = codec;
 429         }
 430
 431         /* Tell the stub where to signal that reply processing is
 432          * finished */
 433         req->reply_processed = &port->reply_processed;
 434
 435         /* Resume the stub waiting in forb_wait_for_reply() */
 436         forb_syncobj_signal(&req->reply_ready);
 437
 438         /* Wait for stub to process the results from the codec's buffer */
 439         forb_syncobj_wait(&port->reply_processed);
 440 }
 441
 442 /**
 443  * Process incomming HELLO messages.
 444  *
 445  * For every incomming HELLO message the peer table is searched
 446  * whether it already contains a record for that peer or not. If not,
 447  * the new peer is added to the table and another hello message is
 448  * sent so that the new peer discovers us quickly.
 449  *
 450  * @param port Port, where hello was received
 451  * @param codec Buffer with the hello message
 452  */
 453 static void
 454 process_hello(forb_port_t *port, FORB_CDR_Codec *codec)
 455 {
 456         forb_server_id server_id;
 457         void *addr = NULL;
 458         forb_peer_t *peer;
 459         forb_t *forb = port->forb;
 460         CORBA_string peer_orb_id = NULL;
 461
 462 /*      printf("Hello received at port %p\n", port); */
 463
 464         forb_server_id_deserialize(codec, &server_id);
 465         if (port->desc.proto->deserialize_addr) {
 466                 port->desc.proto->deserialize_addr(codec, &addr);
 467         }
 468         {
 469                 char str[60], addrstr[60];
 470                 if (port->desc.proto->addr2str) {
 471                         port->desc.proto->addr2str(addrstr, sizeof(addrstr), addr);
 472                 } else
 473                         addrstr[0] = 0;
 474                 ul_logdeb("rcvd hello from %s (addr %s)\n",
 475                           forb_server_id_to_string(str, &server_id, sizeof(str)),
 476                           addrstr);
 477         }
 478         CORBA_string_deserialize(codec, &peer_orb_id);
 479         if (forb_server_id_cmp(&server_id, &forb->server_id) != 0) {
 480                 peer = forb_peer_find(forb, &server_id);
 481                 if (peer && peer->state == FORB_PEER_DISCOVERED) {
 482                         /* TODO: Update last hello receive time */
 483                         if (addr)
 484                                 forb_free(addr);
 485                         if (peer_orb_id)
 486                                 forb_free(peer_orb_id);
 487                         forb_peer_put(peer);
 488                 } else {
 489                         if (port->new_peer) {
 490                                 if (peer)
 491                                         ul_logerr("Unahandled case - FORB_PEER_WANTED && port->new_peer\n");
 492                                 peer = port->new_peer;
 493                                 port->new_peer = NULL;
 494                         }
 495
 496                         forb_new_peer_discovered(port, peer, server_id, addr, peer_orb_id);
 497                 }
 498         }
 499 }
 500
 501 static void
 502 process_message(forb_port_t *port, const forb_iop_message_header *mh,
 503                 FORB_CDR_Codec *codec)
 504 {
 505         CORBA_long data_size = FORB_CDR_data_size(codec);
 506         /* TODO: Check destination address, whether the message is for
 507          * us or should be routed. */
 508
 509         /* TODO: If there is some processing error, skip the rest of
 510          * the message according mh.message_size. */
 511         switch (mh->message_type) {
 512                 case forb_iop_REQUEST:
 513                         process_request(port, codec, mh->message_size);
 514                         break;
 515                 case forb_iop_REPLY:
 516                         process_reply(port, codec);
 517                         break;
 518                 case forb_iop_HELLO:
 519                         process_hello(port, codec);
 520                         break;
 521                 default:
 522                         ul_logmsg("rcvd unknown message type\n");
 523                         break;
 524         }
 525         if (port->new_peer) {
 526                 /* If for some reaseon the new_peer was not processed so free it here. */
 527                 ul_logmsg("Forgotten new_peer\n");
 528                 forb_peer_put(port->new_peer);
 529                 port->new_peer = NULL;
 530         }
 531
 532         FORB_CDR_get_align(codec, 8);
 533
 534         if (FORB_CDR_data_size(codec) != data_size - mh->message_size) {
 535                 size_t processed = data_size - FORB_CDR_data_size(codec);
 536                 ul_logmsg("Message of type %d handled incorrectly (size=%d, processed=%d); fixing\n",
 537                           mh->message_type, mh->message_size, processed);
 538                 ;
 539                 codec->rptr += mh->message_size - processed;
 540         }
 541 }
 542
 543 /**
 544  * Thread run for every port to receive FORB messages from that port.
 545  *
 546  * @param arg Pointer to ::forb_port_t typecasted to void *.
 547  *
 548  * @return Always NULL
 549  */
 550 void *forb_iop_receiver_thread(void *arg)
 551 {
 552         forb_port_t *port = arg;
 553         const forb_proto_t *proto = port->desc.proto;
 554         FORB_CDR_Codec *c = &port->codec;
 555         ssize_t rcvd;
 556         size_t len;
 557         forb_iop_message_header mh;
 558         bool header_received = false;
 559
 560         while (!port->finish) {
 561                 if (c->rptr == c->wptr) {
 562                         /* The buffer is empty now - start writing from begining*/
 563                         FORB_CDR_buffer_reset(c, 0);
 564                 }
 565                 /* TODO: If there is not enough space for reception,
 566                  * we should shift the already received data to the
 567                  * beginning of the buffer. */
 568                 rcvd = proto->recv(port,
 569                                    &c->buffer[c->wptr],
 570                                    c->wptr_max - c->wptr);
 571                 if (rcvd < 0) {
 572                         ul_logerr("recv returned error %d (%s), exiting\n", rcvd, strerror(errno));
 573                         return NULL;
 574                 }
 575                 c->wptr += rcvd;
 576                 c->wptr_last = c->wptr;
 577
 578                 /* While there are some data in the buffer, process them. */
 579                 while (FORB_CDR_data_size(c) > 0) {
 580                         len = FORB_CDR_data_size(c);
 581                         /* Wait for and then process message header */
 582                         if (!header_received) {
 583                                 if (len >= forb_iop_MESSAGE_HEADER_SIZE) {
 584                                         if (c->rptr % 8 != 0) {
 585                                                 ul_logerr("Header doesn't start at 8 byte bounday\n");
 586                                         }
 587                                         header_received = forb_iop_process_message_header(&mh, c);
 588                                         if (!header_received) {
 589                                                 ul_logerr("Wrong header received\n");
 590                                                 /* TODO: We should probably reset the buffer here */
 591                                         }
 592                                         len = FORB_CDR_data_size(c);
 593                                 } else {
 594                                         break; /* Wait for more data to arrive*/
 595                                 }
 596                         }
 597
 598                         /* Wait for and then process the message body */
 599                         if (header_received) {
 600                                 if (len >= mh.message_size) {
 601                                         process_message(port, &mh, c);
 602                                         /* Wait for the next message */
 603                                         header_received = false;
 604                                 } else {
 605                                         break; /* Wait for more data to arrive*/
 606                                 }
 607                         }
 608                 }
 609         }
 610         return NULL;
 611 }
 612
 613 static void
 614 discovery_cleanup(void *codec)
 615 {
 616         FORB_CDR_codec_release_buffer((FORB_CDR_Codec*)codec);
 617         /* TODO: Broadcast some kind of bye bye message */
 618 }
 619
 620
 621 /**
 622  * Thread run for every port to broadcast HELLO messages. These
 623  * messages are used for a FORB to discover all peers (and in future
 624  * also to detect their disconnection).
 625  *
 626  * @param arg Pointer to ::forb_port_t typecasted to void *.
 627  *
 628  * @return Always NULL
 629  */
 630 void *forb_iop_discovery_thread(void *arg)
 631 {
 632         forb_port_t *port = arg;
 633         const forb_proto_t *proto = port->desc.proto;
 634         FORB_CDR_Codec codec;
 635         fosa_abs_time_t hello_time;
 636         fosa_rel_time_t hello_interval = fosa_msec_to_rel_time(1000*proto->hello_interval);
 637         int ret;
 638
 639         FORB_CDR_codec_init_static(&codec, port->forb->orb);
 640         FORB_CDR_buffer_init(&codec, 1024, 0);
 641
 642         pthread_cleanup_push(discovery_cleanup, &codec);
 643
 644         /* Next hello interval is now */
 645         fosa_clock_get_time(FOSA_CLOCK_ABSOLUTE, &hello_time);
 646
 647         while (!port->finish) {
 648                 /* Wait for next hello interval or until somebody
 649                  * signals us. */
 650                 ret = forb_syncobj_timedwait(&port->hello, &hello_time);
 651                 /* sem_timedwait would be more appropriate */
 652                 if (ret == FOSA_ETIMEDOUT) {
 653                         hello_time = fosa_abs_time_incr(hello_time, hello_interval);
 654                 } else if (ret != 0) {
 655                         ul_logerr("hello syncobj error: %s\n", strerror(ret));
 656                 }
 657
 658                 if (port->finish) break;
 659
 660                 FORB_CDR_buffer_reset(&codec, forb_iop_MESSAGE_HEADER_SIZE);
 661                 forb_iop_prepare_hello(&codec, &port->forb->server_id, port->desc.addr,
 662                                        proto->serialize_addr, port->forb->attr.orb_id);
 663 /*              printf("Broadcasting hello from port %p\n", port);  */
 664                 proto->broadcast(port, &codec.buffer[codec.rptr],
 665                                  FORB_CDR_data_size(&codec));
 666         }
 667
 668         pthread_cleanup_pop(1);
 669         return NULL;
 670 }
 671
 672 /**
 673  * Sends REQUEST message to another FORB.
 674  *
 675  * The request @a req has to be prepared by
 676  * forb_iop_prepare_request(). Then, this function adds a message
 677  * header, connects to the destination FORB and sends the request.
 678  *
 679  * If no exception is reported, then the caller must wait for response
 680  * by calling forb_wait_for_reply().
 681  *
 682  * @param req A request prepared by forb_iop_prepare_request()
 683  * @param env Environment for returning exceptions
 684  */
 685 void
 686 forb_request_send(forb_request_t *req, CORBA_Environment *env)
 687 {
 688         CORBA_boolean ret;
 689         forb_peer_t *peer;
 690         ssize_t size;
 691         size_t len;
 692         fosa_abs_time_t timeout;
 693         forb_t *forb = forb_object_to_forb(req->obj);
 694
 695         if (!forb) {
 696                 env->major = FORB_EX_INTERNAL;
 697                 return;
 698         }
 699
 700         req->env = env;     /* Remember, where to return exceptions */
 701
 702         /* All headers must be 8 byte aligned so align the length of
 703          * this message */
 704         if (!FORB_CDR_put_align(&req->cdr_request, 8)) {
 705                 env->major = FORB_EX_INTERNAL;
 706                 ul_logerr("Not enough space for tail align\n");
 707                 return;
 708         }
 709
 710         ret = forb_iop_prepend_message_header(&req->cdr_request, forb_iop_REQUEST);
 711         if (!ret) {
 712                 /* This should never happen */
 713                 env->major = FORB_EX_INTERNAL;
 714                 return;
 715         }
 716
 717         fosa_clock_get_time(FOSA_CLOCK_ABSOLUTE, &timeout);
 718         timeout = fosa_abs_time_incr(timeout,
 719                                      fosa_msec_to_rel_time(1000));
 720         peer = forb_get_next_hop(forb, &req->obj->server, &timeout);
 721         if (!peer) {
 722                 char str[50];
 723                 ul_logerr("Cannot find peer to send request for server %s\n",
 724                           forb_server_id_to_string(str, &req->obj->server, sizeof(str)));
 725                 env->major = FORB_EX_COMM_FAILURE;
 726                 return;
 727         }
 728         /* Register the request with forb so we can match incomming
 729          * reply to this request. */
 730         ret = forb_request_insert(forb, req);
 731         if (ret <= 0) {
 732                 ul_logerr("Insert request error %d\n", ret);
 733                 env->major = FORB_EX_INTERNAL;
 734                 goto err_peer_put;
 735         }
 736
 737         {
 738                 char str[50];
 739                 ul_logdeb("sending request: id=%d  dest=%s\n", req->request_id,
 740                           forb_server_id_to_string(str, &req->obj->server, sizeof(str)));
 741         }
 742         len = FORB_CDR_data_size(&req->cdr_request);
 743         fosa_mutex_lock(&peer->send_lock);
 744         size = forb_proto_send(peer, &req->cdr_request);
 745         fosa_mutex_unlock(&peer->send_lock);
 746         if (size <= 0 || size != len) {
 747                 env->major = FORB_EX_COMM_FAILURE;
 748                 /* Request is deleted when the stub calls forb_request_destroy() */
 749         }
 750  err_peer_put:
 751         forb_peer_put(peer);
 752 }