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1
/*
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 *          Policy Management
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 *
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 *          NEC Europe Ltd. PROPRIETARY INFORMATION
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 *
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 * This software is supplied under the terms of a license agreement
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 * or nondisclosure agreement with NEC Europe Ltd. and may not be
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 * copied or disclosed except in accordance with the terms of that
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 * agreement.
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 *
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 *      Copyright (c) 2009 NEC Europe Ltd. All Rights Reserved.
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 *
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 * Authors: Kristian Beckers  <beckers@nw.neclab.eu>
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 *          Sebastian Kiesel  <kiesel@nw.neclab.eu>
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 *          
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 *
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 * NEC Europe Ltd. DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED,
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 * INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY
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 * AND FITNESS FOR A PARTICULAR PURPOSE AND THE WARRANTY AGAINST LATENT
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 * DEFECTS, WITH RESPECT TO THE PROGRAM AND THE ACCOMPANYING
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 * DOCUMENTATION.
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 *
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 * No Liability For Consequential Damages IN NO EVENT SHALL NEC Europe
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 * Ltd., NEC Corporation OR ANY OF ITS SUBSIDIARIES BE LIABLE FOR ANY
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 * DAMAGES WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS
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 * OF BUSINESS PROFITS, BUSINESS INTERRUPTION, LOSS OF INFORMATION, OR
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 * OTHER PECUNIARY LOSS AND INDIRECT, CONSEQUENTIAL, INCIDENTAL,
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 * ECONOMIC OR PUNITIVE DAMAGES) ARISING OUT OF THE USE OF OR INABILITY
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 * TO USE THIS PROGRAM, EVEN IF NEC Europe Ltd. HAS BEEN ADVISED OF THE
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 * POSSIBILITY OF SUCH DAMAGES.
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 *
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 *     THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
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 */
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#include <ml_all.h>
36

    
37
/**************************** START OF INTERNALS ***********************/
38

    
39

    
40
/*
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 * reserved message type for internal puposes
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 */
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#define MSG_TYPE_ML_KEEPALIVE 0x126        //TODO: check that it is really interpreted as internal
44

    
45
/*
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 * a pointer to a libevent instance
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 */
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struct event_base *base;
49

    
50
/*
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 * define the nr of connections the messaging layer can handle
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 */
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#define CONNECTBUFSIZE 10000
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/*
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 * define the nr of data that can be received parallel
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 */
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#define RECVDATABUFSIZE 10000
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/*
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 * define an array for message multiplexing
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 */
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#define MSGMULTIPLEXSIZE 127
62

    
63

    
64
/*
65
 * timeout before thinking that the STUN server can't be connected
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 */
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#define NAT_TRAVERSAL_TIMEOUT { 1, 0 }
68

    
69
/*
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 * timeout before thinking of an mtu problem (check MAX_TRIALS as well)
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 */
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#define PMTU_TIMEOUT 1000000 // in usec
73

    
74
/*
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 * retry sending connection messages this many times before reducing pmtu
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 */
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#define MAX_TRIALS 3
78

    
79
/*
80
 * default timeout value between the first and the last received packet of a message
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 */
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#define RECV_TIMEOUT_DEFAULT { 2, 0 }
83

    
84
#ifdef RTX
85
/*
86
 * default timeout value for a packet reception
87
 */
88
#define PKT_RECV_TIMEOUT_DEFAULT { 0, 50000 } // 50 ms
89

    
90
/*
91
 * default timeout value for a packet reception
92
 */
93
#define LAST_PKT_RECV_TIMEOUT_DEFAULT { 1, 700000 }
94

    
95
/*
96
 * default fraction of RECV_TIMEOUT_DEFAULT for a last packet(s) reception timeout
97
 */
98
#define LAST_PKT_RECV_TIMEOUT_FRACTION 0.7
99

    
100
#endif
101

    
102

    
103
/*
104
 * global variables
105
 */
106

    
107
/*
108
 * define a buffer of pointers to connect structures
109
 */
110
connect_data *connectbuf[CONNECTBUFSIZE];
111

    
112
/*
113
 * define a pointer buffer with pointers to recv_data structures
114
 */
115
recvdata *recvdatabuf[RECVDATABUFSIZE];
116

    
117
/*
118
 * define a pointer buffer for message multiplexing
119
 */
120
receive_data_cb recvcbbuf[MSGMULTIPLEXSIZE];
121

    
122
/*
123
 * stun server address
124
 */
125
struct sockaddr_in stun_server;
126

    
127
/*
128
 * receive timeout
129
 */
130
static struct timeval recv_timeout = RECV_TIMEOUT_DEFAULT;
131

    
132
/*
133
 * boolean NAT traversal successful if true
134
 */
135
boolean NAT_traversal;
136

    
137
/*
138
 * file descriptor for local socket
139
 */
140
evutil_socket_t socketfd;
141

    
142
/*
143
 * local socketID
144
 */
145
socket_ID local_socketID;
146

    
147
socketID_handle loc_socketID = &local_socketID;
148

    
149
/*
150
 * callback function pointers
151
 */
152
/*
153
 * monitoring module callbacks
154
 */
155
get_recv_pkt_inf_cb get_Recv_pkt_inf_cb = NULL;
156
get_send_pkt_inf_cb get_Send_pkt_inf_cb = NULL;
157
set_monitoring_header_pkt_cb set_Monitoring_header_pkt_cb = NULL;
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get_recv_data_inf_cb get_Recv_data_inf_cb = NULL;
159
get_send_data_inf_cb get_Send_data_inf_cb = NULL;
160
set_monitoring_header_data_cb set_Monitoring_header_data_cb = NULL;
161
/*
162
 * connection callbacks
163
 */
164
receive_connection_cb receive_Connection_cb = NULL;
165
connection_failed_cb failed_Connection_cb = NULL;
166
/*
167
 * local socketID callback
168
 */
169
receive_localsocketID_cb receive_SocketID_cb;
170

    
171
/*
172
 * boolean that defines if received data is transmitted to the upper layer
173
 * via callback or via upper layer polling
174
 */
175
boolean recv_data_callback;
176

    
177
/*
178
 * helper function to get rid of a warning
179
 */
180
#ifndef _WIN32
181
int min(int a, int b) {
182
        if (a > b) return b;
183
        return a;
184
}
185
#endif
186

    
187
#ifdef RTX
188
//*********Counters**********
189

    
190
struct Counters {
191
        unsigned int receivedCompleteMsgCounter;
192
        unsigned int receivedIncompleteMsgCounter;
193
        unsigned int receivedDataPktCounter;
194
        unsigned int receivedRTXDataPktCounter;
195
        unsigned int receivedNACK1PktCounter;
196
        unsigned int receivedNACKMorePktCounter;
197
        unsigned int sentDataPktCounter;
198
        unsigned int sentRTXDataPktCtr;
199
        unsigned int sentNACK1PktCounter;
200
        unsigned int sentNACKMorePktCounter;
201
} counters;
202

    
203
extern unsigned int sentRTXDataPktCounter;
204

    
205
/*
206
 * receive timeout for a packet
207
 */
208
static struct timeval pkt_recv_timeout = PKT_RECV_TIMEOUT_DEFAULT;
209

    
210

    
211
static struct timeval last_pkt_recv_timeout = LAST_PKT_RECV_TIMEOUT_DEFAULT;
212

    
213
void mlShowCounters() {
214
        counters.sentRTXDataPktCtr = sentRTXDataPktCounter;
215
        fprintf(stderr, "\nreceivedCompleteMsgCounter: %d\nreceivedIncompleteMsgCounter: %d\nreceivedDataPktCounter: %d\nreceivedRTXDataPktCounter: %d\nreceivedNACK1PktCounter: %d\nreceivedNACKMorePktCounter: %d\nsentDataPktCounter: %d\nsentRTXDataPktCtr: %d\nsentNACK1PktCounter: %d\nsentNACKMorePktCounter: %d\n", counters.receivedCompleteMsgCounter, counters.receivedIncompleteMsgCounter, counters.receivedDataPktCounter, counters.receivedRTXDataPktCounter, counters.receivedNACK1PktCounter, counters.receivedNACKMorePktCounter, counters.sentDataPktCounter, counters.sentRTXDataPktCtr, counters.sentNACK1PktCounter, counters.sentNACKMorePktCounter);
216
        return;
217
}
218

    
219
void recv_nack_msg(struct msg_header *msg_h, char *msgbuf, int msg_size)
220
{
221
        struct nack_msg *nackmsg;
222
        
223
        msgbuf += msg_h->len_mon_data_hdr;
224
        msg_size -= msg_h->len_mon_data_hdr;
225
        nackmsg = (struct nack_msg*) msgbuf;
226
        
227
        unsigned int gapSize = nackmsg->offsetTo - nackmsg->offsetFrom;
228
        //if (gapSize == 1349) counters.receivedNACK1PktCounter++;
229
        //else counters.receivedNACKMorePktCounter++;
230

    
231
        rtxPacketsFromTo(nackmsg->con_id, nackmsg->msg_seq_num, nackmsg->offsetFrom, nackmsg->offsetTo);        
232
}
233

    
234
void send_msg(int con_id, int msg_type, void* msg, int msg_len, bool truncable, send_params * sParams);
235

    
236
void pkt_recv_timeout_cb(int fd, short event, void *arg){
237
        int recv_id = (long) arg;
238
        debug("ML: recv_timeout_cb called. Timeout for id:%d\n",recv_id);
239

    
240
        //check if message still exists        
241
        if (recvdatabuf[recv_id] == NULL) return;
242

    
243
        //check if gap was filled in the meantime
244
        if (recvdatabuf[recv_id]->gapArray[recvdatabuf[recv_id]->firstGap].offsetFrom == recvdatabuf[recv_id]->gapArray[recvdatabuf[recv_id]->firstGap].offsetTo) {
245
                recvdatabuf[recv_id]->firstGap++;
246
                return;        
247
        }
248

    
249
        struct nack_msg nackmsg;
250
        nackmsg.con_id = recvdatabuf[recv_id]->txConnectionID;
251
        nackmsg.msg_seq_num = recvdatabuf[recv_id]->seqnr;
252
        nackmsg.offsetFrom = recvdatabuf[recv_id]->gapArray[recvdatabuf[recv_id]->firstGap].offsetFrom;
253
        nackmsg.offsetTo = recvdatabuf[recv_id]->gapArray[recvdatabuf[recv_id]->firstGap].offsetTo;
254
        recvdatabuf[recv_id]->firstGap++;
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256
        unsigned int gapSize = nackmsg.offsetTo - nackmsg.offsetFrom;
257

    
258
        send_msg(recvdatabuf[recv_id]->connectionID, ML_NACK_MSG, (char *) &nackmsg, sizeof(struct nack_msg), true, &(connectbuf[recvdatabuf[recv_id]->connectionID]->defaultSendParams));        
259
}
260

    
261
void last_pkt_recv_timeout_cb(int fd, short event, void *arg){
262
        int recv_id = (long) arg;
263
        debug("ML: recv_timeout_cb called. Timeout for id:%d\n",recv_id);
264

    
265
        if (recvdatabuf[recv_id] == NULL) {
266
                return;
267
        }
268

    
269
        if (recvdatabuf[recv_id]->expectedOffset == recvdatabuf[recv_id]->bufsize - recvdatabuf[recv_id]->monitoringDataHeaderLen) return;
270

    
271
        struct nack_msg nackmsg;
272
        nackmsg.con_id = recvdatabuf[recv_id]->txConnectionID;
273
        nackmsg.msg_seq_num = recvdatabuf[recv_id]->seqnr;
274
        nackmsg.offsetFrom = recvdatabuf[recv_id]->expectedOffset;
275
        nackmsg.offsetTo = recvdatabuf[recv_id]->bufsize - recvdatabuf[recv_id]->monitoringDataHeaderLen;
276

    
277
        unsigned int gapSize = nackmsg.offsetTo - nackmsg.offsetFrom;
278

    
279
        send_msg(recvdatabuf[recv_id]->connectionID, ML_NACK_MSG, &nackmsg, sizeof(struct nack_msg), true, &(connectbuf[recvdatabuf[recv_id]->connectionID]->defaultSendParams));        
280
}
281

    
282
#endif
283

    
284

    
285

    
286
/*
287
 * convert a socketID to a string. It uses a static buffer, so either strdup is needed, or the string will get lost!
288
 */
289
const char *conid_to_string(int con_id)
290
{
291
        static char s[INET_ADDRSTRLEN+1+5+1+INET_ADDRSTRLEN+1+5+1];
292
        mlSocketIDToString(&connectbuf[con_id]->external_socketID, s, sizeof(s));
293
        return s;
294
}
295

    
296
void register_recv_localsocketID_cb(receive_localsocketID_cb local_socketID_cb)
297
{
298
        if (local_socketID_cb == NULL) {
299
                error("ML : Register receive_localsocketID_cb: NULL ptr \n");
300
        } else {
301
                receive_SocketID_cb = local_socketID_cb;
302
        }
303
}
304

    
305

    
306
//void keep_connection_alive(const int connectionID)
307
//{
308
//
309
//    // to be done with the NAT traversal
310
//    // send a message over the wire
311
//    printf("\n");
312
//
313
//}
314

    
315
void unsetStunServer()
316
{
317
        stun_server.sin_addr.s_addr = INADDR_NONE;
318
}
319

    
320
bool isStunDefined()
321
{
322
        return stun_server.sin_addr.s_addr != INADDR_NONE;
323
}
324

    
325
void send_msg(int con_id, int msg_type, void* msg, int msg_len, bool truncable, send_params * sParams) {
326
        socketaddrgen udpgen;
327
        bool retry;
328
        int pkt_len, offset;
329
        struct iovec iov[4];
330

    
331
        char h_pkt[MON_PKT_HEADER_SPACE];
332
        char h_data[MON_DATA_HEADER_SPACE];
333

    
334
        struct msg_header msg_h;
335

    
336
        debug("ML: send_msg to %s conID:%d extID:%d\n", conid_to_string(con_id), con_id, connectbuf[con_id]->external_connectionID);
337

    
338
        iov[0].iov_base = &msg_h;
339
        iov[0].iov_len = MSG_HEADER_SIZE;
340

    
341
        msg_h.local_con_id = htonl(con_id);
342
        msg_h.remote_con_id = htonl(connectbuf[con_id]->external_connectionID);
343
        msg_h.msg_type = msg_type;
344
        msg_h.msg_seq_num = htonl(connectbuf[con_id]->seqnr++);
345

    
346

    
347
        iov[1].iov_len = iov[2].iov_len = 0;
348
        iov[1].iov_base = h_pkt;
349
        iov[2].iov_base = h_data;
350

    
351

    
352
        if (connectbuf[con_id]->internal_connect)
353
                udpgen = connectbuf[con_id]->external_socketID.internal_addr;
354
        else
355
                udpgen = connectbuf[con_id]->external_socketID.external_addr;
356

    
357
        do{
358
                offset = 0;
359
                retry = false;
360
                // Monitoring layer hook
361
                if(set_Monitoring_header_data_cb != NULL) {
362
                        iov[2].iov_len = ((set_Monitoring_header_data_cb) (&(connectbuf[con_id]->external_socketID), msg_type));
363
                }
364
                msg_h.len_mon_data_hdr = iov[2].iov_len;
365

    
366
                if(get_Send_data_inf_cb != NULL && iov[2].iov_len != 0) {
367
                        mon_data_inf sd_data_inf;
368

    
369
                        memset(h_data, 0, MON_DATA_HEADER_SPACE);
370

    
371
                        sd_data_inf.remote_socketID = &(connectbuf[con_id]->external_socketID);
372
                        sd_data_inf.buffer = msg;
373
                        sd_data_inf.bufSize = msg_len;
374
                        sd_data_inf.msgtype = msg_type;
375
                        sd_data_inf.monitoringDataHeader = iov[2].iov_base;
376
                        sd_data_inf.monitoringDataHeaderLen = iov[2].iov_len;
377
                        sd_data_inf.priority = sParams->priority;
378
                        sd_data_inf.padding = sParams->padding;
379
                        sd_data_inf.confirmation = sParams->confirmation;
380
                        sd_data_inf.reliable = sParams->reliable;
381
                        memset(&sd_data_inf.arrival_time, 0, sizeof(struct timeval));
382

    
383
                        (get_Send_data_inf_cb) ((void *) &sd_data_inf);
384
                }
385

    
386
                do {
387
                        if(set_Monitoring_header_pkt_cb != NULL) {
388
                                iov[1].iov_len = (set_Monitoring_header_pkt_cb) (&(connectbuf[con_id]->external_socketID), msg_type);
389
                        }
390
                        pkt_len = min(connectbuf[con_id]->pmtusize - iov[2].iov_len - iov[1].iov_len - iov[0].iov_len, msg_len - offset) ;
391

    
392
                        iov[3].iov_len = pkt_len;
393
                        iov[3].iov_base = msg + offset;
394

    
395
                        //fill header
396
                        msg_h.len_mon_packet_hdr = iov[1].iov_len;
397
                        msg_h.offset = htonl(offset);
398
                        msg_h.msg_length = htonl(truncable ? pkt_len : msg_len);
399

    
400

    
401
                        debug("ML: sending packet to %s with rconID:%d lconID:%d\n", conid_to_string(con_id), ntohl(msg_h.remote_con_id), ntohl(msg_h.local_con_id));
402
                        int priority = 0; 
403
                        if ((msg_type == ML_CON_MSG)
404
#ifdef RTX
405
 || (msg_type == ML_NACK_MSG)
406
#endif
407
) priority = HP;
408
                        //fprintf(stderr,"*******************************ML.C: Sending packet: msg_h.offset: %d msg_h.msg_seq_num: %d\n",ntohl(msg_h.offset),ntohl(msg_h.msg_seq_num));
409
                        switch(queueOrSendPacket(socketfd, iov, 4, &udpgen.udpaddr,priority)) {
410
                                case MSGLEN:
411
                                        info("ML: sending message failed, reducing MTU from %d to %d (to:%s conID:%d lconID:%d msgsize:%d offset:%d)\n", connectbuf[con_id]->pmtusize, pmtu_decrement(connectbuf[con_id]->pmtusize), conid_to_string(con_id), ntohl(msg_h.remote_con_id), ntohl(msg_h.local_con_id), msg_len, offset);
412
                                        // TODO: pmtu decremented here, but not in the "truncable" packet. That is currently resent without changing the claimed pmtu. Might need to be changed.
413
                                        connectbuf[con_id]->pmtusize = pmtu_decrement(connectbuf[con_id]->pmtusize);
414
                                        if (connectbuf[con_id]->pmtusize > 0) {
415
                                                connectbuf[con_id]->delay = true;
416
                                                retry = true;
417
                                        }
418
                                        offset = msg_len; // exit the while
419
                                        break;
420
                                case FAILURE:
421
                                        info("ML: sending message failed (to:%s conID:%d lconID:%d msgsize:%d offset:%d)\n", conid_to_string(con_id), ntohl(msg_h.remote_con_id), ntohl(msg_h.local_con_id), msg_len, offset);
422
                                        offset = msg_len; // exit the while
423
                                        break;
424
                                case THROTTLE:
425
                                        debug("THROTTLE on output"); 
426
                                        offset = msg_len; // exit the while
427
                                        break;
428
                                case OK:
429
#ifdef RTX
430
                                        if (msg_type < 127) counters.sentDataPktCounter++;
431
#endif
432
                                        //update
433
                                        offset += pkt_len;
434
                                        //transmit data header only in the first packet
435
                                        iov[2].iov_len = 0;
436
                                        break;
437
                        }
438
                } while(offset != msg_len && !truncable);
439
        } while(retry);
440
        //fprintf(stderr, "sentDataPktCounter after msg_seq_num = %d: %d\n", msg_h.msg_seq_num, counters.sentDataPktCounter);
441
        //fprintf(stderr, "sentRTXDataPktCounter after msg_seq_num = %d: %d\n", msg_h.msg_seq_num, counters.sentRTXDataPktCtr);
442
}
443

    
444
void pmtu_timeout_cb(int fd, short event, void *arg);
445

    
446
int sendPacket(const int udpSocket, struct iovec *iov, int len, struct sockaddr_in *socketaddr) {
447
        //monitoring layer hook
448
debug("SENDP1");
449
        if(get_Send_pkt_inf_cb != NULL && iov[1].iov_len) {
450
                mon_pkt_inf pkt_info;        
451

    
452
                struct msg_header *msg_h  = (struct msg_header *) iov[0].iov_base;
453

    
454
                memset(iov[1].iov_base,0,iov[1].iov_len);
455

    
456
                pkt_info.remote_socketID = &(connectbuf[ntohl(msg_h->local_con_id)]->external_socketID);
457
                pkt_info.buffer = iov[3].iov_base;
458
                pkt_info.bufSize = iov[3].iov_len;
459
                pkt_info.msgtype = msg_h->msg_type;
460
                pkt_info.dataID = ntohl(msg_h->msg_seq_num);
461
                pkt_info.offset = ntohl(msg_h->offset);
462
                pkt_info.datasize = ntohl(msg_h->msg_length);
463
                pkt_info.monitoringHeaderLen = iov[1].iov_len;
464
                pkt_info.monitoringHeader = iov[1].iov_base;
465
                pkt_info.ttl = -1;
466
                memset(&(pkt_info.arrival_time),0,sizeof(struct timeval));
467

    
468
                (get_Send_pkt_inf_cb) ((void *) &pkt_info);
469
        }
470

    
471
         //struct msg_header *msg_h;
472
    //msg_h = (struct msg_header *) iov[0].iov_base;        
473

    
474
        //fprintf(stderr,"*** Sending packet - msgSeqNum: %d offset: %d\n",ntohl(msg_h->msg_seq_num),ntohl(msg_h->offset));
475
debug("SENDP2");
476

    
477
        return sendPacketFinal(udpSocket, iov, len, socketaddr);
478
}
479

    
480
void reschedule_conn_msg(int con_id)
481
{
482
        if (connectbuf[con_id]->timeout_event) {
483
                /* delete old timout */        
484
                event_del(connectbuf[con_id]->timeout_event);
485
                event_free(connectbuf[con_id]->timeout_event);
486
        }
487
        connectbuf[con_id]->timeout_event = event_new(base, -1, EV_TIMEOUT, &pmtu_timeout_cb, (void *) (long)con_id);
488
        evtimer_add(connectbuf[con_id]->timeout_event, &connectbuf[con_id]->timeout_value);
489
}
490

    
491
void send_conn_msg(int con_id, int buf_size, int command_type)
492
{
493
        if (buf_size < sizeof(struct conn_msg)) {
494
                error("ML: requested connection message size is too small\n");
495
                return;
496
        }
497

    
498
        if(connectbuf[con_id]->ctrl_msg_buf == NULL) {
499
                connectbuf[con_id]->ctrl_msg_buf = malloc(buf_size);
500
                memset(connectbuf[con_id]->ctrl_msg_buf, 0, buf_size);
501
        }
502

    
503
        if(connectbuf[con_id]->ctrl_msg_buf == NULL) {
504
                error("ML: can not allocate memory for connection message\n");
505
                return;
506
        }
507

    
508
        struct conn_msg *msg_header = (struct conn_msg*) connectbuf[con_id]->ctrl_msg_buf;
509

    
510
        msg_header->comand_type = command_type;
511
        msg_header->pmtu_size = connectbuf[con_id]->pmtusize;
512

    
513
        memcpy(&(msg_header->sock_id), loc_socketID, sizeof(socket_ID));
514
  {
515
                        char buf[SOCKETID_STRING_SIZE];
516
                        mlSocketIDToString(&((struct conn_msg*)connectbuf[con_id]->ctrl_msg_buf)->sock_id,buf,sizeof(buf));
517
                        debug("Local socket_address sent in INVITE: %s, sizeof msg %ld\n", buf, sizeof(struct conn_msg));
518
   }
519
        send_msg(con_id, ML_CON_MSG, connectbuf[con_id]->ctrl_msg_buf, buf_size, true, &(connectbuf[con_id]->defaultSendParams));
520
}
521

    
522
void send_conn_msg_with_pmtu_discovery(int con_id, int buf_size, int command_type)
523
{
524
        struct timeval tout = {0,0};
525
        tout.tv_usec = PMTU_TIMEOUT * (1.0+ 0.1 *((double)rand()/(double)RAND_MAX-0.5));
526
        connectbuf[con_id]->timeout_value = tout;
527
        connectbuf[con_id]->trials = 1;
528
        send_conn_msg(con_id, buf_size, command_type);
529
        reschedule_conn_msg(con_id);
530
}
531

    
532
void resend_conn_msg(int con_id)
533
{
534
        connectbuf[con_id]->trials++;
535
        send_conn_msg(con_id, connectbuf[con_id]->pmtusize, connectbuf[con_id]->status);
536
        reschedule_conn_msg(con_id);
537
}
538

    
539
void recv_conn_msg(struct msg_header *msg_h, char *msgbuf, int msg_size, struct sockaddr_in *recv_addr)
540
{
541
        struct conn_msg *con_msg;
542
        int free_con_id, con_id;
543

    
544
        time_t now = time(NULL);
545
        double timediff = 0.0;
546
        char sock_id_str[1000];
547
        
548
        msgbuf += msg_h->len_mon_data_hdr;
549
        msg_size -= msg_h->len_mon_data_hdr;
550
        con_msg = (struct conn_msg *)msgbuf;
551
        
552
        //verify message validity
553
        if (msg_size < sizeof(struct conn_msg)) {
554
                char recv_addr_str[INET_ADDRSTRLEN];
555
                inet_ntop(AF_INET, &(recv_addr->sin_addr.s_addr), recv_addr_str, INET_ADDRSTRLEN);
556
                info("Invalid conn_msg received from %s\n", recv_addr_str);
557
                return;
558
        }
559

    
560
        //decode sock_id for debug messages
561
        mlSocketIDToString(&con_msg->sock_id,sock_id_str,999);
562

    
563
        if (con_msg->sock_id.internal_addr.udpaddr.sin_addr.s_addr != recv_addr->sin_addr.s_addr &&
564
            con_msg->sock_id.external_addr.udpaddr.sin_addr.s_addr != recv_addr->sin_addr.s_addr   ) {
565
                char recv_addr_str[INET_ADDRSTRLEN];
566
                inet_ntop(AF_INET, &(recv_addr->sin_addr.s_addr), recv_addr_str, INET_ADDRSTRLEN);
567
                info("Conn msg received from %s, but claims to be from %s", recv_addr_str, sock_id_str);
568
                return;
569
        }
570

    
571
        // Monitoring layer hook
572
        if(get_Recv_data_inf_cb != NULL) {
573
                // update pointer to the real data
574
                mon_data_inf recv_data_inf;
575
                recv_data_inf.remote_socketID = &(con_msg->sock_id);
576
                recv_data_inf.buffer = msgbuf;
577
                recv_data_inf.bufSize = msg_size;
578
                recv_data_inf.msgtype = msg_h->msg_type;
579
                recv_data_inf.monitoringDataHeaderLen = msg_h->len_mon_data_hdr;
580
                recv_data_inf.monitoringDataHeader = msg_h->len_mon_data_hdr ? msgbuf : NULL;
581
                gettimeofday(&recv_data_inf.arrival_time, NULL);
582
                recv_data_inf.firstPacketArrived = true;
583
                recv_data_inf.recvFragments = 1;
584
                recv_data_inf.priority = false;
585
                recv_data_inf.padding = false;
586
                recv_data_inf.confirmation = false;
587
                recv_data_inf.reliable = false;
588

    
589
                // send data recv callback to monitoring module
590
                (get_Recv_data_inf_cb) ((void *) &recv_data_inf);
591
        }
592

    
593
        // check the connection command type
594
        switch (con_msg->comand_type) {
595
                /*
596
                * if INVITE: enter a new socket make new entry in connect array
597
                * send an ok
598
                */
599
                case INVITE:
600
                        info("ML: received INVITE from %s (size:%d)\n", sock_id_str, msg_size);
601
                        /*
602
                        * check if another connection for the external connectionID exist
603
                        * that was established within the last 2 seconds
604
                        */
605
                        free_con_id = -1;
606
                        for (con_id = 0; con_id < CONNECTBUFSIZE; con_id++) {
607
                                if (connectbuf[con_id] != NULL) {
608
                                        if (mlCompareSocketIDs(&(connectbuf[con_id]->external_socketID), &(con_msg->sock_id)) == 0) {
609
                                                //timediff = difftime(now, connectbuf[con_id]->starttime);        //TODO: why this timeout? Shouldn't the connection be closed instead if there is a timeout?
610
                                                //if (timediff < 2)
611
                                                //update remote connection ID
612
                                                if (connectbuf[con_id]->external_connectionID != msg_h->local_con_id) {
613
                                                        warn("ML: updating remote connection ID for %s: from %d to %d\n",sock_id_str, connectbuf[con_id]->external_connectionID, msg_h->local_con_id);
614
                                                        connectbuf[con_id]->external_connectionID = msg_h->local_con_id;
615
                                                }
616
                                                break;
617
                                        }
618
                                } else if(free_con_id == -1)
619
                                        free_con_id = con_id;
620
                        }
621

    
622
                        if (con_id == CONNECTBUFSIZE) {
623
                                // create an entry in the connecttrybuf
624
                                if(free_con_id == -1) {
625
                                        error("ML: no new connect_buf available\n");
626
                                        return;
627
                                }
628
                                connectbuf[free_con_id] = (connect_data *) malloc(sizeof(connect_data));
629
                                memset(connectbuf[free_con_id],0,sizeof(connect_data));
630
                                connectbuf[free_con_id]->connection_head = connectbuf[free_con_id]->connection_last = NULL;
631
                                connectbuf[free_con_id]->starttime = time(NULL);
632
                                memcpy(&(connectbuf[free_con_id]->external_socketID), &(con_msg->sock_id), sizeof(socket_ID));
633
                //Workaround to support reuse of socketID
634
                                connectbuf[free_con_id]->external_socketID.internal_addr.udpaddr.sin_family=AF_INET;
635
                                connectbuf[free_con_id]->external_socketID.external_addr.udpaddr.sin_family=AF_INET;
636
                                connectbuf[free_con_id]->pmtusize = con_msg->pmtu_size;        // bootstrap pmtu from the other's size. Not strictly needed, but a good hint
637
                                connectbuf[free_con_id]->timeout_event = NULL;
638
                                connectbuf[free_con_id]->external_connectionID = msg_h->local_con_id;
639
                                connectbuf[free_con_id]->internal_connect =
640
                                        !compare_external_address_socketIDs(&(con_msg->sock_id), loc_socketID);
641
                                con_id = free_con_id;
642
                        }
643

    
644
                        //if(connectbuf[con_id]->status <= CONNECT) { //TODO: anwer anyway. Why the outher would invite otherwise?
645
                                //update status and send back answer
646
                                connectbuf[con_id]->status = CONNECT;
647
                                send_conn_msg_with_pmtu_discovery(con_id, con_msg->pmtu_size, CONNECT);
648
                        //}
649
                        break;
650
                case CONNECT:
651
                        info("ML: received CONNECT from %s (size:%d)\n", sock_id_str, msg_size);
652

    
653
                        if(msg_h->remote_con_id != -1 && connectbuf[msg_h->remote_con_id] == NULL) {
654
                                error("ML: received CONNECT for inexistent connection rconID:%d\n",msg_h->remote_con_id);
655
                                return;
656
                        }
657

    
658
                        /*
659
                        * check if the connection status is not already 1 or 2
660
                        */
661
                        if (connectbuf[msg_h->remote_con_id]->status == INVITE) {
662
                                // set the external connectionID
663
                                connectbuf[msg_h->remote_con_id]->external_connectionID = msg_h->local_con_id;
664
                                // change status con_msg the connection_data
665
                                connectbuf[msg_h->remote_con_id]->status = READY;
666
                                // change pmtusize in the connection_data: not needed. receiving a CONNECT means our INVITE went through. So why change pmtu?
667
                                //connectbuf[msg_h->remote_con_id]->pmtusize = con_msg->pmtu_size;
668

    
669
                                // send the READY
670
                                send_conn_msg_with_pmtu_discovery(msg_h->remote_con_id, con_msg->pmtu_size, READY);
671

    
672
                                if (receive_Connection_cb != NULL)
673
                                        (receive_Connection_cb) (msg_h->remote_con_id, NULL);
674

    
675
                                // call all registered callbacks
676
                                while(connectbuf[msg_h->remote_con_id]->connection_head != NULL) {
677
                                        struct receive_connection_cb_list *temp;
678
                                        temp = connectbuf[msg_h->remote_con_id]->connection_head;
679
                                        (temp->connection_cb) (msg_h->remote_con_id, temp->arg);
680
                                        connectbuf[msg_h->remote_con_id]->connection_head = temp->next;
681
                                        free(temp);
682
                                }
683
                                connectbuf[msg_h->remote_con_id]->connection_head =
684
                                        connectbuf[msg_h->remote_con_id]->connection_last = NULL;
685
                        } else {
686
                                // send the READY
687
                                send_conn_msg_with_pmtu_discovery(msg_h->remote_con_id, con_msg->pmtu_size, READY);
688
                        }
689

    
690
                        debug("ML: active connection established\n");
691
                        break;
692

    
693
                        /*
694
                        * if READY: find the entry in the connection array set the
695
                        * connection active change the pmtu size
696
                        */
697
                case READY:
698
                        info("ML: received READY from %s (size:%d)\n", sock_id_str, msg_size);
699
                        if(connectbuf[msg_h->remote_con_id] == NULL) {
700
                                error("ML: received READY for inexistent connection\n");
701
                                return;
702
                        }
703
                        /*
704
                        * checks if the connection is not already established
705
                        */
706
                        if (connectbuf[msg_h->remote_con_id]->status == CONNECT) {
707
                                // change status of the connection
708
                                connectbuf[msg_h->remote_con_id]->status = READY;
709
                                // change pmtusize: not needed. pmtu doesn't have to be symmetric
710
                                //connectbuf[msg_h->remote_con_id]->pmtusize = con_msg->pmtu_size;
711

    
712
                                if (receive_Connection_cb != NULL)
713
                                        (receive_Connection_cb) (msg_h->remote_con_id, NULL);
714

    
715
                                while(connectbuf[msg_h->remote_con_id]->connection_head != NULL) {
716
                                        struct receive_connection_cb_list *temp;
717
                                        temp = connectbuf[msg_h->remote_con_id]->connection_head;
718
                                        (temp->connection_cb) (msg_h->remote_con_id, temp->arg);
719
                                        connectbuf[msg_h->remote_con_id]->connection_head = temp->next;
720
                                        free(temp);
721
                                }
722
                                connectbuf[msg_h->remote_con_id]->connection_head =
723
                                        connectbuf[msg_h->remote_con_id]->connection_last = NULL;
724
                                debug("ML: passive connection established\n");
725
                        }
726
                        break;
727
        }
728
}
729

    
730
void recv_stun_msg(char *msgbuf, int recvSize)
731
{
732
        /*
733
        * create empty stun message struct
734
        */
735
        StunMessage resp;
736
        memset(&resp, 0, sizeof(StunMessage));
737
        /*
738
        * parse the message
739
        */
740
        int returnValue = 0;
741
        returnValue = recv_stun_message(msgbuf, recvSize, &resp);
742

    
743
        if (returnValue == 0) {
744
                /*
745
                * read the reflexive Address into the local_socketID
746
                */
747
                struct sockaddr_in reflexiveAddr = {0};
748
                reflexiveAddr.sin_family = AF_INET;
749
                reflexiveAddr.sin_addr.s_addr = htonl(resp.mappedAddress.ipv4.addr);
750
                reflexiveAddr.sin_port = htons(resp.mappedAddress.ipv4.port);
751
                socketaddrgen reflexiveAddres = {0};
752
                reflexiveAddres.udpaddr = reflexiveAddr;
753
                local_socketID.external_addr = reflexiveAddres;
754
                NAT_traversal = true;
755
                // callback to the upper layer indicating that the socketID is now
756
                // ready to use
757
                {
758
                        char buf[SOCKETID_STRING_SIZE];
759
                        mlSocketIDToString(&local_socketID,buf,sizeof(buf));
760
                         debug("received local socket_address: %s\n", buf);
761
                }
762
                (receive_SocketID_cb) (&local_socketID, 0);
763
        }
764
}
765

    
766
//done
767
void recv_timeout_cb(int fd, short event, void *arg)
768
{
769
        int recv_id = (long) arg;
770
        debug("ML: recv_timeout_cb called. Timeout for id:%d\n",recv_id);
771

    
772
        if (recvdatabuf[recv_id] == NULL) {
773
                return;
774
        }
775

    
776

    
777
/*        if(recvdatabuf[recv_id]->status == ACTIVE) {
778
                //TODO make timeout at least a DEFINE
779
                struct timeval timeout = { 4, 0 };
780
                recvdatabuf[recv_id]->status = INACTIVE;
781
                event_base_once(base, -1, EV_TIMEOUT, recv_timeout_cb,
782
                        arg, &timeout);
783
                return;
784
        }
785
*/
786

    
787
        if(recvdatabuf[recv_id]->status == ACTIVE) {
788
                // Monitoring layer hook
789
                if(get_Recv_data_inf_cb != NULL) {
790
                        mon_data_inf recv_data_inf;
791

    
792
                        recv_data_inf.remote_socketID =
793
                                        &(connectbuf[recvdatabuf[recv_id]->connectionID]->external_socketID);
794
                        recv_data_inf.buffer = recvdatabuf[recv_id]->recvbuf;
795
                        recv_data_inf.bufSize = recvdatabuf[recv_id]->bufsize;
796
                        recv_data_inf.msgtype = recvdatabuf[recv_id]->msgtype;
797
                        recv_data_inf.monitoringDataHeaderLen = recvdatabuf[recv_id]->monitoringDataHeaderLen;
798
                        recv_data_inf.monitoringDataHeader = recvdatabuf[recv_id]->monitoringDataHeaderLen ?
799
                                recvdatabuf[recv_id]->recvbuf : NULL;
800
                        gettimeofday(&recv_data_inf.arrival_time, NULL);
801
                        recv_data_inf.firstPacketArrived = recvdatabuf[recv_id]->firstPacketArrived;
802
                        recv_data_inf.recvFragments = recvdatabuf[recv_id]->recvFragments;
803
                        recv_data_inf.priority = false;
804
                        recv_data_inf.padding = false;
805
                        recv_data_inf.confirmation = false;
806
                        recv_data_inf.reliable = false;
807

    
808
                        // send data recv callback to monitoring module
809

    
810
//                        (get_Recv_data_inf_cb) ((void *) &recv_data_inf);
811
                }
812

    
813
                // Get the right callback
814
                receive_data_cb receive_data_callback = recvcbbuf[recvdatabuf[recv_id]->msgtype];
815

    
816
                recv_params rParams;
817

    
818
                rParams.nrMissingBytes = recvdatabuf[recv_id]->bufsize - recvdatabuf[recv_id]->arrivedBytes;
819
                rParams.recvFragments = recvdatabuf[recv_id]->recvFragments;
820
                rParams.msgtype = recvdatabuf[recv_id]->msgtype;
821
                rParams.connectionID = recvdatabuf[recv_id]->connectionID;
822
                rParams.remote_socketID =
823
                        &(connectbuf[recvdatabuf[recv_id]->connectionID]->external_socketID);
824
                rParams.firstPacketArrived = recvdatabuf[recv_id]->firstPacketArrived;
825

    
826
#ifdef RTX
827
                counters.receivedIncompleteMsgCounter++;
828
                //mlShowCounters();
829
                //fprintf(stderr,"******Cleaning slot for inclomplete msg_seq_num: %d\n", recvdatabuf[recv_id]->seqnr);                
830
#endif
831
                 //(receive_data_callback) (recvdatabuf[recv_id]->recvbuf + recvdatabuf[recv_id]->monitoringDataHeaderLen, recvdatabuf[recv_id]->bufsize - recvdatabuf[recv_id]->monitoringDataHeaderLen, recvdatabuf[recv_id]->msgtype, &rParams);
832

    
833
                //clean up
834
                if (recvdatabuf[recv_id]->timeout_event) {
835
                        event_del(recvdatabuf[recv_id]->timeout_event);
836
                        event_free(recvdatabuf[recv_id]->timeout_event);
837
                        recvdatabuf[recv_id]->timeout_event = NULL;
838
                }
839
                free(recvdatabuf[recv_id]->recvbuf);
840
                free(recvdatabuf[recv_id]);
841
                recvdatabuf[recv_id] = NULL;
842
        }
843
}
844

    
845
// process a single recv data message
846
void recv_data_msg(struct msg_header *msg_h, char *msgbuf, int bufsize)
847
{
848
        debug("ML: received packet of size %d with rconID:%d lconID:%d type:%d offset:%d inlength: %d\n",bufsize,msg_h->remote_con_id,msg_h->local_con_id,msg_h->msg_type,msg_h->offset, msg_h->msg_length);
849

    
850
        int recv_id, free_recv_id = -1;
851

    
852
        if(connectbuf[msg_h->remote_con_id] == NULL) {
853
                debug("ML: Received a message not related to any opened connection!\n");
854
                return;
855
        }
856

    
857
#ifdef RTX
858
        counters.receivedDataPktCounter++;
859
#endif        
860
        // check if a recv_data exist and enter data
861
        for (recv_id = 0; recv_id < RECVDATABUFSIZE; recv_id++) {
862
                if (recvdatabuf[recv_id] != NULL) {
863
                        if (msg_h->remote_con_id == recvdatabuf[recv_id]->connectionID &&
864
                                        msg_h->msg_seq_num == recvdatabuf[recv_id]->seqnr)
865
                                                break;
866
                } else
867
                        if(free_recv_id == -1)
868
                                free_recv_id = recv_id;
869
  }
870

    
871
        if(recv_id == RECVDATABUFSIZE) {
872
                debug(" recv id not found (free found: %d)\n", free_recv_id);
873
                //no recv_data found: create one
874
                recv_id = free_recv_id;
875
                recvdatabuf[recv_id] = (recvdata *) malloc(sizeof(recvdata));
876
                memset(recvdatabuf[recv_id], 0, sizeof(recvdata));
877
                recvdatabuf[recv_id]->connectionID = msg_h->remote_con_id;
878
                recvdatabuf[recv_id]->seqnr = msg_h->msg_seq_num;
879
                recvdatabuf[recv_id]->monitoringDataHeaderLen = msg_h->len_mon_data_hdr;
880
                recvdatabuf[recv_id]->bufsize = msg_h->msg_length + msg_h->len_mon_data_hdr;
881
                recvdatabuf[recv_id]->recvbuf = (char *) malloc(recvdatabuf[recv_id]->bufsize);
882
                recvdatabuf[recv_id]->arrivedBytes = 0;        //count this without the Mon headers
883
#ifdef RTX
884
                recvdatabuf[recv_id]->txConnectionID = msg_h->local_con_id;
885
                recvdatabuf[recv_id]->expectedOffset = 0;
886
                recvdatabuf[recv_id]->gapCounter = 0;
887
                recvdatabuf[recv_id]->firstGap = 0;
888
                recvdatabuf[recv_id]->last_pkt_timeout_event = NULL;
889
#endif
890

    
891
                /*
892
                * read the timeout data and set it
893
                */
894
                recvdatabuf[recv_id]->timeout_value = recv_timeout;
895
                recvdatabuf[recv_id]->timeout_event = NULL;
896
                recvdatabuf[recv_id]->recvID = recv_id;
897
                recvdatabuf[recv_id]->starttime = time(NULL);
898
                recvdatabuf[recv_id]->msgtype = msg_h->msg_type;
899

    
900
                // fill the buffer with zeros
901
                memset(recvdatabuf[recv_id]->recvbuf, 0, recvdatabuf[recv_id]->bufsize);
902
                debug(" new @ id:%d\n",recv_id);
903
        } else {        //message structure already exists, no need to create new
904
                debug(" found @ id:%d (arrived before this packet: bytes:%d fragments%d\n",recv_id, recvdatabuf[recv_id]->arrivedBytes, recvdatabuf[recv_id]->recvFragments);
905
        }
906

    
907
        //if first packet extract mon data header and advance pointer
908
        if (msg_h->offset == 0) {
909
                //fprintf(stderr,"Hoooooray!! We have first packet of some message!!\n");
910
                memcpy(recvdatabuf[recv_id]->recvbuf, msgbuf, msg_h->len_mon_data_hdr);
911
                msgbuf += msg_h->len_mon_data_hdr;
912
                bufsize -= msg_h->len_mon_data_hdr;
913
                recvdatabuf[recv_id]->firstPacketArrived = 1;
914
        }
915

    
916

    
917
        // increment fragmentnr
918
        recvdatabuf[recv_id]->recvFragments++;
919
        // increment the arrivedBytes
920
        recvdatabuf[recv_id]->arrivedBytes += bufsize; 
921

    
922
        //fprintf(stderr,"Arrived bytes: %d Offset: %d Expected offset: %d\n",recvdatabuf[recv_id]->arrivedBytes/1349,msg_h->offset/1349,recvdatabuf[recv_id]->expectedOffset/1349);
923

    
924
        // enter the data into the buffer
925
        memcpy(recvdatabuf[recv_id]->recvbuf + msg_h->len_mon_data_hdr + msg_h->offset, msgbuf, bufsize);
926
#ifdef RTX
927
        // detecting a new gap        
928
        if (msg_h->offset > recvdatabuf[recv_id]->expectedOffset) {
929
                recvdatabuf[recv_id]->gapArray[recvdatabuf[recv_id]->gapCounter].offsetFrom = recvdatabuf[recv_id]->expectedOffset;
930
                recvdatabuf[recv_id]->gapArray[recvdatabuf[recv_id]->gapCounter].offsetTo = msg_h->offset;
931
                if (recvdatabuf[recv_id]->gapCounter < RTX_MAX_GAPS - 1) recvdatabuf[recv_id]->gapCounter++;
932
                evtimer_add(event_new(base, -1, EV_TIMEOUT, &pkt_recv_timeout_cb, (void *) (long)recv_id), &pkt_recv_timeout);
933
        }
934
        
935
        //filling the gap by delayed packets
936
        if (msg_h->offset < recvdatabuf[recv_id]->expectedOffset){
937
                counters.receivedRTXDataPktCounter++;
938
                //skip retransmitted packets
939
                if (recvdatabuf[recv_id]->firstGap < recvdatabuf[recv_id]->gapCounter && msg_h->offset >= recvdatabuf[recv_id]->gapArray[recvdatabuf[recv_id]->firstGap].offsetFrom) {
940
                        int i;
941
                        //fprintf(stderr,"firstGap: %d        gapCounter: %d\n", recvdatabuf[recv_id]->firstGap, recvdatabuf[recv_id]->gapCounter);
942
                        for (i = recvdatabuf[recv_id]->firstGap; i < recvdatabuf[recv_id]->gapCounter; i++){
943
                                if (msg_h->offset == recvdatabuf[recv_id]->gapArray[i].offsetFrom) {
944
                                        recvdatabuf[recv_id]->gapArray[i].offsetFrom += bufsize;
945
                                        break;
946
                                }
947
                                if (msg_h->offset == (recvdatabuf[recv_id]->gapArray[i].offsetTo - bufsize)) {
948
                                        recvdatabuf[recv_id]->gapArray[i].offsetTo -= bufsize;
949
                                        break;
950
                                }
951
                        }
952
                } else {//fprintf(stderr,"Skipping retransmitted packets in filling the gap.\n"); 
953
                        //counters.receivedRTXDataPktCounter++;
954
                        }
955
        }
956

    
957
        //updating the expectedOffset        
958
        if (msg_h->offset >= recvdatabuf[recv_id]->expectedOffset) recvdatabuf[recv_id]->expectedOffset = msg_h->offset + bufsize;
959
#endif
960

    
961
        //TODO very basic checkif all fragments arrived: has to be reviewed
962
        if(recvdatabuf[recv_id]->arrivedBytes == recvdatabuf[recv_id]->bufsize - recvdatabuf[recv_id]->monitoringDataHeaderLen)
963
                recvdatabuf[recv_id]->status = COMPLETE; //buffer full -> msg completly arrived
964
        else
965
                recvdatabuf[recv_id]->status = ACTIVE;
966

    
967
        if (recv_data_callback) {
968
                if(recvdatabuf[recv_id]->status == COMPLETE) {
969
                        // Monitoring layer hook
970
                        if(get_Recv_data_inf_cb != NULL) {
971
                                mon_data_inf recv_data_inf;
972

    
973
                                recv_data_inf.remote_socketID =
974
                                         &(connectbuf[recvdatabuf[recv_id]->connectionID]->external_socketID);
975
                                recv_data_inf.buffer = recvdatabuf[recv_id]->recvbuf;
976
                                recv_data_inf.bufSize = recvdatabuf[recv_id]->bufsize;
977
                                recv_data_inf.msgtype = recvdatabuf[recv_id]->msgtype;
978
                                recv_data_inf.monitoringDataHeaderLen = recvdatabuf[recv_id]->monitoringDataHeaderLen;
979
                                recv_data_inf.monitoringDataHeader = recvdatabuf[recv_id]->monitoringDataHeaderLen ?
980
                                        recvdatabuf[recv_id]->recvbuf : NULL;
981
                                gettimeofday(&recv_data_inf.arrival_time, NULL);
982
                                recv_data_inf.firstPacketArrived = recvdatabuf[recv_id]->firstPacketArrived;
983
                                recv_data_inf.recvFragments = recvdatabuf[recv_id]->recvFragments;
984
                                recv_data_inf.priority = false;
985
                                recv_data_inf.padding = false;
986
                                recv_data_inf.confirmation = false;
987
                                recv_data_inf.reliable = false;
988

    
989
                                // send data recv callback to monitoring module
990

    
991
                                (get_Recv_data_inf_cb) ((void *) &recv_data_inf);
992
                        }
993

    
994
                        // Get the right callback
995
                        receive_data_cb receive_data_callback = recvcbbuf[msg_h->msg_type];
996
                        if (receive_data_callback) {
997

    
998
                                recv_params rParams;
999

    
1000
                                rParams.nrMissingBytes = recvdatabuf[recv_id]->bufsize - recvdatabuf[recv_id]->monitoringDataHeaderLen - recvdatabuf[recv_id]->arrivedBytes;
1001
                                rParams.recvFragments = recvdatabuf[recv_id]->recvFragments;
1002
                                rParams.msgtype = recvdatabuf[recv_id]->msgtype;
1003
                                rParams.connectionID = recvdatabuf[recv_id]->connectionID;
1004
                                rParams.remote_socketID =
1005
                                        &(connectbuf[recvdatabuf[recv_id]->connectionID]->external_socketID);
1006

    
1007
                                char str[1000];
1008
                                mlSocketIDToString(rParams.remote_socketID,str,999);
1009
                                debug("ML: received message from conID:%d, %s\n",recvdatabuf[recv_id]->connectionID,str);
1010
                                rParams.firstPacketArrived = recvdatabuf[recv_id]->firstPacketArrived;
1011

    
1012
#ifdef RTX
1013
                                counters.receivedCompleteMsgCounter++;
1014
                                //mlShowCounters();
1015
#endif
1016

    
1017
                                (receive_data_callback) (recvdatabuf[recv_id]->recvbuf + recvdatabuf[recv_id]->monitoringDataHeaderLen, recvdatabuf[recv_id]->bufsize - recvdatabuf[recv_id]->monitoringDataHeaderLen,
1018
                                        recvdatabuf[recv_id]->msgtype, (void *) &rParams);
1019
                        } else {
1020
                            warn("ML: callback not initialized for this message type: %d!\n",msg_h->msg_type);
1021
                        }
1022
                        
1023
                        //clean up
1024
                        if (recvdatabuf[recv_id]->timeout_event) {
1025
                                debug("ML: freeing timeout for %d",recv_id);
1026
                                event_del(recvdatabuf[recv_id]->timeout_event);
1027
                                event_free(recvdatabuf[recv_id]->timeout_event);
1028
                                recvdatabuf[recv_id]->timeout_event = NULL;
1029
                        } else {
1030
                                debug("ML: received in 1 packet\n",recv_id);
1031
                        }
1032
#ifdef RTX
1033
                        if (recvdatabuf[recv_id]->last_pkt_timeout_event) {
1034
                                debug("ML: freeing last packet timeout for %d",recv_id);
1035
                                event_del(recvdatabuf[recv_id]->last_pkt_timeout_event);
1036
                                event_free(recvdatabuf[recv_id]->last_pkt_timeout_event);
1037
                                recvdatabuf[recv_id]->last_pkt_timeout_event = NULL;
1038
                        }
1039
                        //fprintf(stderr,"******Cleaning slot for clomplete msg_seq_num: %d\n", recvdatabuf[recv_id]->seqnr);        
1040
#endif
1041
                        free(recvdatabuf[recv_id]->recvbuf);
1042
                        free(recvdatabuf[recv_id]);
1043
                        recvdatabuf[recv_id] = NULL;
1044
                } else { // not COMPLETE
1045
                        if (!recvdatabuf[recv_id]->timeout_event) {
1046
                                //start time out
1047
                                //TODO make timeout at least a DEFINE
1048
                                recvdatabuf[recv_id]->timeout_event = event_new(base, -1, EV_TIMEOUT, &recv_timeout_cb, (void *) (long)recv_id);
1049
                                evtimer_add(recvdatabuf[recv_id]->timeout_event, &recv_timeout);
1050
#ifdef RTX
1051
                                recvdatabuf[recv_id]->last_pkt_timeout_event = event_new(base, -1, EV_TIMEOUT, &last_pkt_recv_timeout_cb, (void *) (long)recv_id);
1052
                                evtimer_add(recvdatabuf[recv_id]->last_pkt_timeout_event, &last_pkt_recv_timeout);
1053
#endif
1054
                        }
1055
                }
1056
        }
1057
}
1058

    
1059
//done
1060
void pmtu_timeout_cb(int fd, short event, void *arg)
1061
{
1062

    
1063
        int con_id = (long) arg;
1064
        pmtu new_pmtusize;
1065

    
1066
        debug("ML: pmtu timeout called (lcon:%d)\n",con_id);
1067

    
1068
        if(connectbuf[con_id] == NULL) {
1069
                error("ML: pmtu timeout called on non existing con_id\n");
1070
                return;
1071
        }
1072

    
1073
        if(connectbuf[con_id]->status == READY) {
1074
                // nothing to do anymore
1075
                event_del(connectbuf[con_id]->timeout_event);
1076
                event_free(connectbuf[con_id]->timeout_event);
1077
                connectbuf[con_id]->timeout_event = NULL;
1078
                return;
1079
        }
1080

    
1081
        info("ML: pmtu timeout while connecting(to:%s lcon:%d status:%d size:%d trial:%d tout:%ld.%06ld)\n",conid_to_string(con_id), con_id, connectbuf[con_id]->status, connectbuf[con_id]->pmtusize, connectbuf[con_id]->trials, connectbuf[con_id]->timeout_value.tv_sec, connectbuf[con_id]->timeout_value.tv_usec);
1082

    
1083
        if(connectbuf[con_id]->delay || connectbuf[con_id]->trials == MAX_TRIALS - 1) {
1084
                double delay = connectbuf[con_id]->timeout_value.tv_sec + connectbuf[con_id]->timeout_value.tv_usec / 1000000.0;
1085
                delay = delay * 2;
1086
                info("\tML: increasing pmtu timeout to %f sec\n", delay);
1087
                connectbuf[con_id]->timeout_value.tv_sec = floor(delay);
1088
                connectbuf[con_id]->timeout_value.tv_usec = fmod(delay, 1.0) * 1000000.0;
1089
                if(connectbuf[con_id]->delay) {
1090
                        connectbuf[con_id]->delay = false;
1091
                        reschedule_conn_msg(con_id);
1092
                }
1093
        }
1094

    
1095
        if(connectbuf[con_id]->trials == MAX_TRIALS) {
1096
                // decrement the pmtu size
1097
                struct timeval tout = {0,0};
1098
                tout.tv_usec = PMTU_TIMEOUT * (1.0+ 0.1 *((double)rand()/(double)RAND_MAX-0.5));
1099
                info("\tML: decreasing pmtu estimate from %d to %d\n", connectbuf[con_id]->pmtusize, pmtu_decrement(connectbuf[con_id]->pmtusize));
1100
                connectbuf[con_id]->pmtusize = pmtu_decrement(connectbuf[con_id]->pmtusize);
1101
                connectbuf[con_id]->timeout_value = tout; 
1102
                connectbuf[con_id]->trials = 0;
1103
        }
1104

    
1105
        //error in PMTU discovery?
1106
        if (connectbuf[con_id]->pmtusize == P_ERROR) {
1107
                if (connectbuf[con_id]->internal_connect == true) {
1108
                        //as of now we tried directly connecting, now let's try trough the NAT
1109
                        connectbuf[con_id]->internal_connect = false;
1110
                        connectbuf[con_id]->pmtusize = DSLSLIM;
1111
                } else {
1112
                        //nothing to do we have to give up
1113
                        error("ML: Could not create connection with connectionID %i!\n",con_id);
1114
                        // envoke the callback for failed connection establishment
1115
                        if(failed_Connection_cb != NULL)
1116
                                (failed_Connection_cb) (con_id, NULL);
1117
                        // delete the connection entry
1118
                        mlCloseConnection(con_id);
1119
                        return;
1120
                }
1121
        }
1122

    
1123
        //retry
1124
        resend_conn_msg(con_id);
1125
}
1126

    
1127

    
1128
int schedule_pmtu_timeout(int con_id)
1129
{
1130
        if (! connectbuf[con_id]->timeout_event) {
1131
                struct timeval tout = {0,0};
1132
                tout.tv_usec = PMTU_TIMEOUT * (1.0+ 0.1 *((double)rand()/(double)RAND_MAX-0.5));
1133
                connectbuf[con_id]->timeout_value = tout;
1134
                connectbuf[con_id]->trials = 1;
1135
                connectbuf[con_id]->timeout_event = event_new(base, -1, EV_TIMEOUT, &pmtu_timeout_cb, (void *) (long)con_id);
1136
                evtimer_add(connectbuf[con_id]->timeout_event, &connectbuf[con_id]->timeout_value);
1137
        }
1138
}
1139

    
1140
/*
1141
 * decrements the mtu size
1142
 */
1143
pmtu pmtu_decrement(pmtu pmtusize)
1144
{
1145
        pmtu pmtu_return_size;
1146
        switch(pmtusize) {
1147
        case MAX:
1148
                //return DSL;
1149
                return DSLSLIM;        //shortcut to use less vales
1150
        case DSL:
1151
                return DSLMEDIUM;
1152
        case DSLMEDIUM:
1153
                return DSLSLIM;
1154
        case DSLSLIM:
1155
                //return BELOWDSL;
1156
                return MIN;        //shortcut to use less vales
1157
        case BELOWDSL:
1158
                return MIN;
1159
        case MIN:
1160
                return P_ERROR;
1161
        default:
1162
                warn("ML: strange pmtu size encountered:%d, changing to some safe value:%d\n", pmtusize, MIN);
1163
                return MIN;
1164
        }
1165
}
1166

    
1167
// called when an ICMP pmtu error message (type 3, code 4) is received
1168
void pmtu_error_cb_th(char *msg, int msglen)
1169
{
1170
        debug("ML: pmtu_error callback called msg_size: %d\n",msglen);
1171
        //TODO debug
1172
        return;
1173

    
1174
    char *msgbufptr = NULL;
1175
    int msgtype;
1176
    int connectionID;
1177
    pmtu pmtusize;
1178
    pmtu new_pmtusize;
1179
    int dead = 0;
1180

    
1181
    // check the packettype
1182
    msgbufptr = &msg[0];
1183

    
1184
    // check the msgtype
1185
    msgbufptr = &msg[1];
1186
    memcpy(&msgtype, msgbufptr, 4);
1187

    
1188
    if (msgtype == 0) {
1189

    
1190
        // get the connectionID
1191
        msgbufptr = &msg[5];
1192
        memcpy(&connectionID, msgbufptr, 4);
1193

    
1194
        int msgtype_c = connectbuf[connectionID]->status;
1195
//        pmtusize = connectbuf[connectionID]->pmtutrysize;
1196

    
1197
        if (msgtype_c != msgtype) {
1198
            dead = 1;
1199
        }
1200

    
1201

    
1202
    } else if (msgtype == 1) {
1203

    
1204
        // read the connectionID
1205
        msgbufptr = &msg[9];
1206
        memcpy(&connectionID, msgbufptr, 4);
1207

    
1208
        int msgtype_c = connectbuf[connectionID]->status;
1209
//        pmtusize = connectbuf[connectionID]->pmtutrysize;
1210

    
1211
        if (msgtype_c != msgtype) {
1212
            dead = 1;
1213
        }
1214

    
1215
    }
1216
    // decrement the pmtu size
1217
    new_pmtusize = pmtu_decrement(pmtusize);
1218

    
1219
//    connectbuf[connectionID]->pmtutrysize = new_pmtusize;
1220

    
1221
    if (new_pmtusize == P_ERROR) {
1222
                error("ML:  Could not create connection with connectionID %i !\n",
1223
                        connectionID);
1224

    
1225
                if(failed_Connection_cb != NULL)
1226
                        (failed_Connection_cb) (connectionID, NULL);
1227
                // set the message type to a non existent message
1228
                msgtype = 2;
1229
                // delete the connection entry
1230
                 mlCloseConnection(connectionID);
1231
        }
1232

    
1233
    if (msgtype == 0 && dead != 1) {
1234

    
1235
        // stop the timeout event
1236
        // timeout_del(connectbuf[connectionID]->timeout);
1237
        /*
1238
         * libevent2
1239
         */
1240

    
1241
        // event_del(connectbuf[connectionID]->timeout);
1242

    
1243

    
1244
        // create and send a connection message
1245
//         create_conn_msg(new_pmtusize, connectionID,
1246
//                         &local_socketID, INVITE);
1247

    
1248
//        send_conn_msg(connectionID, new_pmtusize);
1249

    
1250
        // set a timeout event for the pmtu discovery
1251
        // timeout_set(connectbuf[connectionID]->timeout,pmtu_timeout_cb,(void
1252
        // *)&connectionID);
1253

    
1254
        // timeout_add(connectbuf[connectionID]->timeout,&connectbuf[connectionID]->timeout_value);
1255

    
1256
        /*
1257
         * libevent2
1258
         */
1259

    
1260
        struct event *ev;
1261
        ev = evtimer_new(base, pmtu_timeout_cb,
1262
                         (void *) connectbuf[connectionID]);
1263

    
1264
        // connectbuf[connectionID]->timeout = ev;
1265

    
1266
        event_add(ev, &connectbuf[connectionID]->timeout_value);
1267

    
1268
    } else if (msgtype == 1 && dead != 1) {
1269

    
1270
        // stop the timeout event
1271
        // timeout_del(connectbuf[connectionID]->timeout);
1272

    
1273
        /*
1274
         * libevent2
1275
         */
1276
        // info("still here 11 \n");
1277
        // printf("ev %d \n",connectbuf[connectionID]->timeout);
1278
        // event_del(connectbuf[connectionID]->timeout );
1279
        // evtimer_del(connectbuf[connectionID]->timeout );
1280

    
1281

    
1282
//         // create and send a connection message
1283
//         create_conn_msg(new_pmtusize,
1284
//                         connectbuf[connectionID]->connectionID,
1285
//                         NULL, CONNECT);
1286

    
1287
        //send_conn_msg(connectionID, new_pmtusize);
1288

    
1289
        // set a timeout event for the pmtu discovery
1290
        // timeout_set(connectbuf[connectionID]->timeout,pmtu_timeout_cb,(void
1291
        // *)&connectionID);
1292
        // timeout_add(connectbuf[connectionID]->timeout,&connectbuf[connectionID]->timeout_value);
1293

    
1294
        /*
1295
         * libevent2
1296
         */
1297
        // struct event *ev;
1298
        // ev = evtimer_new(base,pmtu_timeout_cb, (void
1299
        // *)connectbuf[connectionID]);
1300
        // connectbuf[connectionID]->timeout = ev;
1301
        // event_add(ev,&connectbuf[connectionID]->timeout_value);
1302

    
1303
    }
1304
}
1305

    
1306
/*
1307
 * what to do once a packet arrived if it is a conn packet send it to
1308
 * recv_conn handler if it is a data packet send it to the recv_data
1309
 * handler
1310
 */
1311

    
1312
//done --
1313
void recv_pkg(int fd, short event, void *arg)
1314
{
1315
        debug("ML: recv_pkg called\n");
1316

    
1317
        struct msg_header *msg_h;
1318
        char msgbuf[MAX];
1319
        pmtu recvSize = MAX;
1320
        char *bufptr = msgbuf;
1321
        int ttl;
1322
        struct sockaddr_in recv_addr;
1323
        int msg_size;
1324

    
1325
        recvPacket(fd, msgbuf, &recvSize, &recv_addr, pmtu_error_cb_th, &ttl);
1326

    
1327

    
1328
        // check if it is not just an ERROR message
1329
        if(recvSize < 0)
1330
                return;
1331

    
1332
        // @TODO check if this simplistic STUN message recognition really always works, probably not
1333
        unsigned short stun_bind_response = 0x0101;
1334
        unsigned short * msgspot = (unsigned short *) msgbuf;
1335
        if (*msgspot == stun_bind_response) {
1336
                debug("ML: recv_pkg: parse stun message called on %d bytes\n", recvSize);
1337
                recv_stun_msg(msgbuf, recvSize);
1338
                return;
1339
        }
1340

    
1341
        msg_h = (struct msg_header *) msgbuf;
1342

    
1343
        uint32_t inlen = ntohl(msg_h->msg_length);
1344
        if(inlen > 0x20000 || inlen < ntohl(msg_h->offset) || inlen == 0) {
1345
            warn("ML: BAD PACKET received from: %s:%d (len: %d < %d [=%08X] o:%d)", 
1346
                  inet_ntoa(recv_addr.sin_addr), recv_addr.sin_port,
1347
                               recvSize, inlen, inlen, ntohl(msg_h->offset));
1348
 warn("ML: received %d: %02X %02X %02X %02X %02X %02X - %02X %02X %02X %02X %02X %02X", recvSize,
1349
            msgbuf[0], msgbuf[1],msgbuf[2],msgbuf[3],msgbuf[4],msgbuf[5],
1350
            msgbuf[6],msgbuf[7],msgbuf[8],msgbuf[9],msgbuf[10],msgbuf[11]);
1351

    
1352
            return;
1353
       }
1354

    
1355
        /* convert header from network to host order */
1356
        msg_h->offset = ntohl(msg_h->offset);
1357
        msg_h->msg_length = ntohl(msg_h->msg_length);
1358
        msg_h->local_con_id = ntohl(msg_h->local_con_id);
1359
        msg_h->remote_con_id = ntohl(msg_h->remote_con_id);
1360
        msg_h->msg_seq_num = ntohl(msg_h->msg_seq_num);
1361

    
1362
        //verify minimum size
1363
        if (recvSize < sizeof(struct msg_header)) {
1364
          info("UDP packet too small, can't be an ML packet");
1365
          return;
1366
        }
1367

    
1368
        //TODO add more verifications
1369

    
1370
        bufptr += MSG_HEADER_SIZE + msg_h->len_mon_packet_hdr;
1371
        msg_size = recvSize - MSG_HEADER_SIZE - msg_h->len_mon_packet_hdr;
1372

    
1373
        //verify more fields
1374
        if (msg_size < 0) {
1375
          info("Corrupted UDP packet received");
1376
          return;
1377
        }
1378

    
1379
        if(get_Recv_pkt_inf_cb != NULL) {
1380
                mon_pkt_inf msginfNow;
1381
                msginfNow.monitoringHeaderLen = msg_h->len_mon_packet_hdr;
1382
                msginfNow.monitoringHeader = msg_h->len_mon_packet_hdr ? &msgbuf[0] + MSG_HEADER_SIZE : NULL;
1383
                //TODO rethink this ...
1384
                if(msg_h->msg_type == ML_CON_MSG) {
1385
                        struct conn_msg *c_msg = (struct conn_msg *) bufptr;
1386
                        msginfNow.remote_socketID = &(c_msg->sock_id);
1387
                }
1388
                else if(msg_h->remote_con_id < 0 || 
1389
                       msg_h->remote_con_id >= CONNECTBUFSIZE || 
1390
                       connectbuf[msg_h->remote_con_id] == NULL) {
1391
                        error("ML: received pkg called with non existent connection\n");
1392
                        return;
1393
                } else
1394
                        msginfNow.remote_socketID = &(connectbuf[msg_h->remote_con_id]->external_socketID);
1395
                msginfNow.buffer = bufptr;
1396
                msginfNow.bufSize = recvSize;
1397
                msginfNow.msgtype = msg_h->msg_type;
1398
                msginfNow.ttl = ttl;
1399
                msginfNow.dataID = msg_h->msg_seq_num;
1400
                msginfNow.offset = msg_h->offset;
1401
                msginfNow.datasize = msg_h->msg_length;
1402
                gettimeofday(&msginfNow.arrival_time, NULL);
1403
                (get_Recv_pkt_inf_cb) ((void *) &msginfNow);
1404
        }
1405

    
1406

    
1407
        switch(msg_h->msg_type) {
1408
                case ML_CON_MSG:
1409
                        debug("ML: received conn pkg\n");
1410
                        recv_conn_msg(msg_h, bufptr, msg_size, &recv_addr);
1411
                        break;
1412
#ifdef RTX
1413
                case ML_NACK_MSG:
1414
                        debug("ML: received nack pkg\n");
1415
                        recv_nack_msg(msg_h, bufptr, msg_size);
1416
                        break;
1417
#endif
1418
                default:
1419
                        if(msg_h->msg_type < 127) {
1420
                                debug("ML: received data pkg\n");
1421
                                recv_data_msg(msg_h, bufptr, msg_size);
1422
                                break;
1423
                        }
1424
                        debug("ML: unrecognised msg_type\n");
1425
                        break;
1426
        }
1427
}
1428

    
1429
/*
1430
 * compare the external IP address of two socketIDs
1431
 */
1432
int
1433
compare_external_address_socketIDs(socketID_handle sock1, socketID_handle sock2)
1434
{
1435
        if( sock1->external_addr.udpaddr.sin_addr.s_addr == sock2->external_addr.udpaddr.sin_addr.s_addr)
1436
                return 0;
1437
        return 1;
1438
}
1439

    
1440
void try_stun();
1441

    
1442
/*
1443
 * the timeout of the NAT traversal
1444
 */
1445
void nat_traversal_timeout(int fd, short event, void *arg)
1446
{
1447
debug("X. NatTrTo %d\n", NAT_traversal);
1448
        if (NAT_traversal == false) {
1449
                debug("ML: NAT traversal request re-send\n");
1450
                if(receive_SocketID_cb)
1451
                        (receive_SocketID_cb) (&local_socketID, 2);
1452
                try_stun();
1453
        }
1454
debug("X. NatTrTo\n");
1455
}
1456

    
1457
//return IP address, or INADDR_NONE if can't resolve
1458
unsigned long resolve(const char *ipaddr)
1459
{
1460
        struct hostent *h = gethostbyname(ipaddr);
1461
        if (!h) {
1462
                error("ML: Unable to resolve host name %s\n", ipaddr);
1463
                return INADDR_NONE;
1464
        }
1465
        unsigned long *addr = (unsigned long *) (h->h_addr);
1466
        return *addr;
1467
}
1468

    
1469

    
1470
/*
1471
 * returns the file descriptor, or <0 on error. The ipaddr can be a null
1472
 * pointer. Then all available ipaddr on the machine are choosen.
1473
 */
1474
int create_socket(const int port, const char *ipaddr)
1475
{
1476
        struct sockaddr_in udpaddr = {0};
1477
        udpaddr.sin_family = AF_INET;
1478
        debug("X. create_socket %s, %d\n", ipaddr, port);
1479
        if (ipaddr == NULL) {
1480
                /*
1481
                * try to guess the local IP address
1482
                */
1483
                const char *ipaddr_iface = mlAutodetectIPAddress();
1484
                if (ipaddr_iface) {
1485
                        udpaddr.sin_addr.s_addr = inet_addr(ipaddr_iface);
1486
                } else {
1487
                        udpaddr.sin_addr.s_addr = INADDR_ANY;
1488
                }
1489
        } else {
1490
                udpaddr.sin_addr.s_addr = inet_addr(ipaddr);
1491
        }
1492
        udpaddr.sin_port = htons(port);
1493

    
1494
        socketaddrgen udpgen;
1495
        memset(&udpgen,0,sizeof(socketaddrgen));        //this will be sent over the net, so set it to 0
1496
        udpgen.udpaddr = udpaddr;
1497
        local_socketID.internal_addr = udpgen;
1498

    
1499
        socketfd = createSocket(port, ipaddr);
1500
        if (socketfd < 0){
1501
                return socketfd;
1502
        }
1503

    
1504
        struct event *ev;
1505
        ev = event_new(base, socketfd, EV_READ | EV_PERSIST, recv_pkg, NULL);
1506

    
1507
        event_add(ev, NULL);
1508

    
1509
        try_stun();
1510

    
1511
        return socketfd;
1512
}
1513

    
1514
/*
1515
 * try to figure out external IP using STUN, if defined
1516
 */
1517
void try_stun()
1518
{
1519
        if (isStunDefined()) {
1520
                /*
1521
                * send the NAT traversal STUN request
1522
                */
1523
                 send_stun_request(socketfd, &stun_server);
1524

    
1525
                /*
1526
                * enter a NAT traversal timeout that takes care of retransmission
1527
                */
1528
                struct event *ev1;
1529
                struct timeval timeout_value_NAT_traversal = NAT_TRAVERSAL_TIMEOUT;
1530
                ev1 = evtimer_new(base, nat_traversal_timeout, NULL);
1531
                event_add(ev1, &timeout_value_NAT_traversal);
1532

    
1533
                NAT_traversal = false;
1534
        } else {
1535
                /*
1536
                * Assume we have accessibility and copy internal address to external one
1537
                */
1538
                local_socketID.external_addr = local_socketID.internal_addr;
1539
                NAT_traversal = true; // @TODO: this is not really NAT traversal, but a flag that init is over
1540
                // callback to the upper layer indicating that the socketID is now
1541
                // ready to use
1542
                if(receive_SocketID_cb)
1543
                        (receive_SocketID_cb) (&local_socketID, 0); //success
1544
        }
1545
}
1546

    
1547
/**************************** END OF INTERNAL ***********************/
1548

    
1549
/**************************** MONL functions *************************/
1550

    
1551
int mlInit(bool recv_data_cb,struct timeval timeout_value,const int port,const char *ipaddr,const int stun_port,const char *stun_ipaddr,receive_localsocketID_cb local_socketID_cb,void *arg){
1552

    
1553
/*X*/ //  fprintf(stderr,"MLINIT1 %s, %d, %s, %d\n", ipaddr, port, stun_ipaddr, stun_port);
1554
        base = (struct event_base *) arg;
1555
        recv_data_callback = recv_data_cb;
1556
        mlSetRecvTimeout(timeout_value);
1557
        if (stun_ipaddr) {
1558
                 mlSetStunServer(stun_port, stun_ipaddr);
1559
        } else {
1560

    
1561
        }
1562
        register_recv_localsocketID_cb(local_socketID_cb);
1563
/*X*/ //  fprintf(stderr,"MLINIT1\n");
1564
        return create_socket(port, ipaddr);
1565
}
1566

    
1567
void mlSetRateLimiterParams(int bucketsize, int drainrate, int maxQueueSize, int maxQueueSizeRTX, double maxTimeToHold) {
1568
        setOutputRateParams(bucketsize, drainrate);
1569
        setQueuesParams (maxQueueSize, maxQueueSizeRTX, maxTimeToHold);
1570
}
1571
     
1572
void mlSetVerbosity (int log_level) {
1573
        setLogLevel(log_level);
1574
}
1575

    
1576
/* register callbacks  */
1577
void mlRegisterGetRecvPktInf(get_recv_pkt_inf_cb recv_pkt_inf_cb){
1578

    
1579
        if (recv_pkt_inf_cb == NULL) {
1580
                error("ML: Register get_recv_pkt_inf_cb failed: NULL ptr  \n");
1581
        } else {
1582
                get_Recv_pkt_inf_cb = recv_pkt_inf_cb;
1583
        }
1584
}
1585

    
1586
void mlRegisterGetSendPktInf(get_send_pkt_inf_cb  send_pkt_inf_cb){
1587

    
1588
        if (send_pkt_inf_cb == NULL) {
1589
                error("ML: Register get_send_pkt_inf_cb: NULL ptr  \n");
1590
        } else {
1591
                get_Send_pkt_inf_cb = send_pkt_inf_cb;
1592
        }
1593
}
1594

    
1595

    
1596
void mlRegisterSetMonitoringHeaderPktCb(set_monitoring_header_pkt_cb monitoring_header_pkt_cb ){
1597

    
1598
        if (monitoring_header_pkt_cb == NULL) {
1599
                error("ML: Register set_monitoring_header_pkt_cb: NULL ptr  \n");
1600
        } else {
1601
                set_Monitoring_header_pkt_cb = monitoring_header_pkt_cb;
1602
        }
1603
}
1604

    
1605
void mlRegisterGetRecvDataInf(get_recv_data_inf_cb recv_data_inf_cb){
1606

    
1607
        if (recv_data_inf_cb == NULL) {
1608
                error("ML: Register get_recv_data_inf_cb: NULL ptr  \n");
1609
        } else {
1610
                get_Recv_data_inf_cb = recv_data_inf_cb;
1611
        }
1612
}
1613

    
1614
void mlRegisterGetSendDataInf(get_send_data_inf_cb  send_data_inf_cb){
1615

    
1616
        if (send_data_inf_cb == NULL) {
1617
                error("ML: Register get_send_data_inf_cb: NULL ptr  \n");
1618
        } else {
1619
                get_Send_data_inf_cb = send_data_inf_cb;
1620
        }
1621
}
1622

    
1623
void mlRegisterSetMonitoringHeaderDataCb(set_monitoring_header_data_cb monitoring_header_data_cb){
1624

    
1625
        if (monitoring_header_data_cb == NULL) {
1626
                error("ML: Register set_monitoring_header_data_cb : NULL ptr  \n");
1627
        } else {
1628
                set_Monitoring_header_data_cb = monitoring_header_data_cb;
1629
        }
1630
}
1631

    
1632
void mlSetRecvTimeout(struct timeval timeout_value){
1633

    
1634
        recv_timeout = timeout_value;
1635
#ifdef RTX
1636
        unsigned int total_usec = recv_timeout.tv_sec * 1000000 + recv_timeout.tv_usec;
1637
        total_usec = total_usec * LAST_PKT_RECV_TIMEOUT_FRACTION;
1638
        last_pkt_recv_timeout.tv_sec = total_usec / 1000000;
1639
        last_pkt_recv_timeout.tv_usec = total_usec - last_pkt_recv_timeout.tv_sec * 1000000;
1640
        fprintf(stderr,"Timeout for receiving message: %d : %d\n", recv_timeout.tv_sec, recv_timeout.tv_usec);        
1641
        fprintf(stderr,"Timeout for last pkt: %d : %d\n", last_pkt_recv_timeout.tv_sec, last_pkt_recv_timeout.tv_usec);        
1642
#endif
1643
}
1644

    
1645
int mlGetStandardTTL(socketID_handle socketID,uint8_t *ttl){
1646

    
1647
        return getTTL(socketfd, ttl);
1648

    
1649
}
1650

    
1651
socketID_handle mlGetLocalSocketID(int *errorstatus){
1652

    
1653
        if (NAT_traversal == false) {
1654
                *errorstatus = 2;
1655
                return NULL;
1656
        }
1657

    
1658
        *errorstatus = 0;
1659
        return &local_socketID;
1660

    
1661
}
1662

    
1663

    
1664
/**************************** END of MONL functions *************************/
1665

    
1666
/**************************** GENERAL functions *************************/
1667

    
1668
void mlRegisterRecvConnectionCb(receive_connection_cb recv_conn_cb){
1669

    
1670
        if (recv_conn_cb == NULL) {
1671
                error("ML: Register receive_connection_cb: NULL ptr  \n");
1672
        }else {
1673
                receive_Connection_cb = recv_conn_cb;
1674
        }
1675
}
1676

    
1677
void mlRegisterErrorConnectionCb(connection_failed_cb conn_failed){
1678

    
1679
        if (conn_failed == NULL) {
1680
                error("ML: Register connection_failed_cb: NULL ptr  \n");
1681
        } else {
1682
                failed_Connection_cb = conn_failed;
1683
        }
1684
}
1685

    
1686
void mlRegisterRecvDataCb(receive_data_cb data_cb,unsigned char msgtype){
1687

    
1688
    if (msgtype > 126) {
1689

    
1690
            error
1691
            ("ML: Could not register recv_data callback. Msgtype is greater then 126 \n");
1692

    
1693
    }
1694

    
1695
    if (data_cb == NULL) {
1696

    
1697
            error("ML: Register receive data callback: NUll ptr \n ");
1698

    
1699
    } else {
1700

    
1701
        recvcbbuf[msgtype] = data_cb;
1702

    
1703
    }
1704

    
1705
}
1706

    
1707
void mlCloseSocket(socketID_handle socketID){
1708

    
1709
        free(socketID);
1710

    
1711
}
1712

    
1713
void keepalive_fn(evutil_socket_t fd, short what, void *arg) {
1714
        socketID_handle peer = arg;
1715

    
1716
        int con_id = mlConnectionExist(peer, false);
1717
        if (con_id < 0 || connectbuf[con_id]->defaultSendParams.keepalive <= 0) {
1718
                /* Connection fell from under us or keepalive was disabled */
1719
                free(arg);
1720
                return;
1721
        }
1722

    
1723
        /* do what we gotta do */
1724
        if ( connectbuf[con_id]->status == READY) {
1725
                char keepaliveMsg[32] = "";
1726
                sprintf(keepaliveMsg, "KEEPALIVE %d", connectbuf[con_id]->keepalive_seq++);
1727
                send_msg(con_id, MSG_TYPE_ML_KEEPALIVE, keepaliveMsg, 1 + strlen(keepaliveMsg), false, 
1728
                        &(connectbuf[con_id]->defaultSendParams));
1729
        }
1730

    
1731
        /* re-schedule */
1732
        struct timeval t = { 0,0 };
1733
        t.tv_sec = connectbuf[con_id]->defaultSendParams.keepalive;
1734
        if (connectbuf[con_id]->defaultSendParams.keepalive) 
1735
                event_base_once(base, -1, EV_TIMEOUT, keepalive_fn, peer, &t);
1736
}
1737

    
1738
void setupKeepalive(int conn_id) {
1739
        /* Save the peer's address for us */
1740
        socketID_handle peer = malloc(sizeof(socket_ID));
1741
        memcpy(peer, &connectbuf[conn_id]->external_socketID, sizeof(socket_ID));
1742

    
1743
        struct timeval t = { 0,0 };
1744
        t.tv_sec = connectbuf[conn_id]->defaultSendParams.keepalive;
1745

    
1746
        if (connectbuf[conn_id]->defaultSendParams.keepalive) 
1747
                event_base_once(base, -1, EV_TIMEOUT, keepalive_fn, peer, &t);
1748
}
1749

    
1750
/* connection functions */
1751
int mlOpenConnection(socketID_handle external_socketID,receive_connection_cb connection_cb,void *arg, const send_params defaultSendParams){
1752

    
1753
        int con_id;
1754
        if (external_socketID == NULL) {
1755
                error("ML: cannot open connection: one of the socketIDs is NULL\n");
1756
                return -1;
1757
        }
1758
        if (NAT_traversal == false) {
1759
                error("ML: cannot open connection: NAT traversal for socketID still in progress\n");
1760
                return -1;
1761
        }
1762
        if (connection_cb == NULL) {
1763
                error("ML: cannot open connection: connection_cb is NULL\n");
1764
                return -1;
1765
        }
1766

    
1767
        // check if that connection already exist
1768

    
1769
        con_id = mlConnectionExist(external_socketID, false);
1770
        if (con_id >= 0) {
1771
                // overwrite defaultSendParams
1772
                bool newKeepalive = 
1773
                        connectbuf[con_id]->defaultSendParams.keepalive == 0 && defaultSendParams.keepalive != 0;
1774
                connectbuf[con_id]->defaultSendParams = defaultSendParams;
1775
                if (newKeepalive) setupKeepalive(con_id);
1776
                // if so check if it is ready to use
1777
                if (connectbuf[con_id]->status == READY) {
1778
                                // if so use the callback immediately
1779
                                (connection_cb) (con_id, arg);
1780

    
1781
                // otherwise just write the connection cb and the arg pointer
1782
                // into the connection struct
1783
                } else {
1784
                        struct receive_connection_cb_list *temp;
1785
                        temp = malloc(sizeof(struct receive_connection_cb_list));
1786
                        temp->next = NULL;
1787
                        temp->connection_cb = connection_cb;
1788
                        temp->arg = arg;
1789
                        if(connectbuf[con_id]->connection_last != NULL) {
1790
                                connectbuf[con_id]->connection_last->next = temp;
1791
                                connectbuf[con_id]->connection_last = temp;
1792
                        } else
1793
                                connectbuf[con_id]->connection_last = connectbuf[con_id]->connection_head = temp;
1794
                }
1795
                return con_id;
1796
        }
1797
        // make entry in connection_establishment array
1798
        for (con_id = 0; con_id < CONNECTBUFSIZE; con_id++) {
1799
                if (connectbuf[con_id] == NULL) {
1800
                        connectbuf[con_id] = (connect_data *) malloc(sizeof(connect_data));
1801
                        memset(connectbuf[con_id],0,sizeof(connect_data));
1802
                        connectbuf[con_id]->starttime = time(NULL);
1803
                        memcpy(&connectbuf[con_id]->external_socketID, external_socketID, sizeof(socket_ID));
1804
                        connectbuf[con_id]->pmtusize = DSLSLIM;
1805
                        connectbuf[con_id]->timeout_event = NULL;
1806
                        connectbuf[con_id]->status = INVITE;
1807
                        connectbuf[con_id]->seqnr = 0;
1808
                        connectbuf[con_id]->internal_connect = !compare_external_address_socketIDs(external_socketID, &local_socketID);
1809
                        connectbuf[con_id]->connectionID = con_id;
1810

    
1811
                        connectbuf[con_id]->connection_head = connectbuf[con_id]->connection_last = malloc(sizeof(struct receive_connection_cb_list));
1812
                        connectbuf[con_id]->connection_last->next = NULL;
1813
                        connectbuf[con_id]->connection_last->connection_cb = connection_cb;
1814
                        connectbuf[con_id]->connection_last->arg = arg;
1815
                        connectbuf[con_id]->external_connectionID = -1;
1816

    
1817
                        connectbuf[con_id]->defaultSendParams = defaultSendParams;
1818
                        if (defaultSendParams.keepalive) setupKeepalive(con_id);
1819
                        break;
1820
                }
1821
        } //end of for
1822

    
1823
        if (con_id == CONNECTBUFSIZE) {
1824
                error("ML: Could not open connection: connection buffer full\n");
1825
                return -1;
1826
        }
1827

    
1828
        // create and send a connection message
1829
        info("ML:Sending INVITE to %s (lconn:%d)\n",conid_to_string(con_id), con_id);
1830
        send_conn_msg_with_pmtu_discovery(con_id, connectbuf[con_id]->pmtusize, INVITE);
1831

    
1832
        return con_id;
1833

    
1834
}
1835

    
1836
void mlCloseConnection(const int connectionID){
1837

    
1838
        // remove it from the connection array
1839
        if(connectbuf[connectionID]) {
1840
                if(connectbuf[connectionID]->ctrl_msg_buf) {
1841
                        free(connectbuf[connectionID]->ctrl_msg_buf);
1842
                }
1843
                // remove related events
1844
                if (connectbuf[connectionID]->timeout_event) {
1845
                        event_del(connectbuf[connectionID]->timeout_event);
1846
                        event_free(connectbuf[connectionID]->timeout_event);
1847
                        connectbuf[connectionID]->timeout_event = NULL;
1848
                }
1849
                free(connectbuf[connectionID]);
1850
                connectbuf[connectionID] = NULL;
1851
        }
1852

    
1853
}
1854

    
1855
void mlSendData(const int connectionID,char *sendbuf,int bufsize,unsigned char msgtype,send_params *sParams){
1856

    
1857
        if (connectionID < 0) {
1858
                error("ML: send data failed: connectionID does not exist\n");
1859
                return;
1860
        }
1861

    
1862
        if (connectbuf[connectionID] == NULL) {
1863
                error("ML: send data failed: connectionID does not exist\n");
1864
                return;
1865
        }
1866
        if (connectbuf[connectionID]->status != READY) {
1867
            error("ML: send data failed: connection is not active\n");
1868
            return;
1869
        }
1870

    
1871
        if (sParams == NULL) {
1872
                sParams = &(connectbuf[connectionID]->defaultSendParams);
1873
        }
1874

    
1875
        send_msg(connectionID, msgtype, sendbuf, bufsize, false, sParams);
1876

    
1877
}
1878

    
1879
/* transmit data functions  */
1880
int mlSendAllData(const int connectionID,send_all_data_container *container,int nr_entries,unsigned char msgtype,send_params *sParams){
1881

    
1882
    if (nr_entries < 1 || nr_entries > 5) {
1883

    
1884
        error
1885
            ("ML : sendALlData : nr_enties is not between 1 and 5 \n ");
1886
        return 0;
1887

    
1888
    } else {
1889

    
1890
        if (nr_entries == 1) {
1891

    
1892
                mlSendData(connectionID, container->buffer_1,
1893
                      container->length_1, msgtype, sParams);
1894

    
1895
            return 1;
1896

    
1897
        } else if (nr_entries == 2) {
1898

    
1899
            int buflen = container->length_1 + container->length_2;
1900
            char buf[buflen];
1901
            memcpy(buf, container->buffer_1, container->length_1);
1902
            memcpy(&buf[container->length_1], container->buffer_2,
1903
                   container->length_2);
1904
            mlSendData(connectionID, buf, buflen, msgtype, sParams);
1905

    
1906
            return 1;
1907

    
1908
        } else if (nr_entries == 3) {
1909

    
1910
            int buflen =
1911
                container->length_1 + container->length_2 +
1912
                container->length_3;
1913
            char buf[buflen];
1914
            memcpy(buf, container->buffer_1, container->length_1);
1915
            memcpy(&buf[container->length_1], container->buffer_2,
1916
                   container->length_2);
1917
            memcpy(&buf[container->length_2], container->buffer_3,
1918
                   container->length_3);
1919
            mlSendData(connectionID, buf, buflen, msgtype, sParams);
1920

    
1921

    
1922
            return 1;
1923

    
1924
        } else if (nr_entries == 4) {
1925

    
1926
            int buflen =
1927
                container->length_1 + container->length_2 +
1928
                container->length_3 + container->length_4;
1929
            char buf[buflen];
1930
            memcpy(buf, container->buffer_1, container->length_1);
1931
            memcpy(&buf[container->length_1], container->buffer_2,
1932
                   container->length_2);
1933
            memcpy(&buf[container->length_2], container->buffer_3,
1934
                   container->length_3);
1935
            memcpy(&buf[container->length_3], container->buffer_4,
1936
                   container->length_4);
1937
            mlSendData(connectionID, buf, buflen, msgtype, sParams);
1938

    
1939
            return 1;
1940

    
1941
        } else {
1942

    
1943
            int buflen =
1944
                container->length_1 + container->length_2 +
1945
                container->length_3 + container->length_4 +
1946
                container->length_5;
1947
            char buf[buflen];
1948
            memcpy(buf, container->buffer_1, container->length_1);
1949
            memcpy(&buf[container->length_1], container->buffer_2,
1950
                   container->length_2);
1951
            memcpy(&buf[container->length_2], container->buffer_3,
1952
                   container->length_3);
1953
            memcpy(&buf[container->length_3], container->buffer_4,
1954
                   container->length_4);
1955
            memcpy(&buf[container->length_4], container->buffer_5,
1956
                   container->length_5);
1957
            mlSendData(connectionID, buf, buflen, msgtype, sParams);
1958

    
1959
            return 1;
1960
        }
1961

    
1962
    }
1963

    
1964
}
1965

    
1966
int mlRecvData(const int connectionID,char *recvbuf,int *bufsize,recv_params *rParams){
1967

    
1968
        //TODO yet to be converted
1969
        return 0;
1970
#if 0
1971
        if (rParams == NULL) {
1972
                error("ML: recv_data failed: recv_params is a NULL ptr\n");
1973
                return 0;
1974
    } else {
1975

1976
        info("ML: recv data called \n");
1977

1978
        int i = 0;
1979
        int returnValue = 0;
1980
        double timeout = (double) recv_timeout.tv_sec;
1981
        time_t endtime = time(NULL);
1982

1983
        for (i = 0; i < RECVDATABUFSIZE; i++) {
1984

1985
            if (recvdatabuf[i] != NULL) {
1986

1987
                if (recvdatabuf[i]->connectionID == connectionID) {
1988

1989
                    info("ML: recv data has entry  \n");
1990

1991
                    double timepass = difftime(endtime, recvdatabuf[i]->starttime);
1992

1993
                    // check if the specified connection has data and it
1994
                    // is complete
1995
                    // check the data seqnr
1996
                    // if(connectionID == recvdatabuf[i]->connectionID &&
1997
                    // 1 == recvdatabuf[i]->status){
1998

1999
                    if (1 == recvdatabuf[i]->status) {
2000

2001
                        // info("transmissionHandler: recv_data set is
2002
                        // complete \n" );
2003

2004
                        // debug("debud \n");
2005

2006
                        // exchange the pointers
2007
                        int buffersize = 0;
2008
                        buffersize = recvdatabuf[i]->bufsize;
2009
                        *bufsize = buffersize;
2010
                        // recvbuf = recvdatabuf[i]->recvbuf;
2011

2012
                        // info("buffersize %d \n",buffersize);
2013
                        memcpy(recvbuf, recvdatabuf[i]->recvbuf,
2014
                               buffersize);
2015
                        // debug(" recvbuf %s \n",recvbuf );
2016

2017
//                         double nrMissFrags =
2018
//                             (double) recvdatabuf[i]->nrFragments /
2019
//                             (double) recvdatabuf[i]->recvFragments;
2020
//                         int nrMissingFragments = (int) ceil(nrMissFrags);
2021

2022
//                        rParams->nrMissingFragments = nrMissingFragments;
2023
//                         rParams->nrFragments = recvdatabuf[i]->nrFragments;
2024
                        rParams->msgtype = recvdatabuf[i]->msgtype;
2025
                        rParams->connectionID =
2026
                            recvdatabuf[i]->connectionID;
2027

2028
                        // break from the loop
2029
                        // debug(" recvbuf %s \n ",recvbuf);
2030

2031
                        // double nrMissFrags =
2032
                        // (double)recvdatabuf[i]->nrFragments /
2033
                        // (double)recvdatabuf[i]->recvFragments;
2034
                        // int nrMissingFragments =
2035
                        // (int)ceil(nrMissFrags);
2036

2037
                        if(get_Recv_data_inf_cb != NULL) {
2038
                                mon_data_inf recv_data_inf;
2039

2040
                                recv_data_inf.remote_socketID = &(connectbuf[connectionID]->external_socketID);
2041
                                recv_data_inf.buffer = recvdatabuf[i]->recvbuf;
2042
                                recv_data_inf.bufSize = recvdatabuf[i]->bufsize;
2043
                                recv_data_inf.msgtype = recvdatabuf[i]->msgtype;
2044
//                                 recv_data_inf.monitoringHeaderType = recvdatabuf[i]->monitoringHeaderType;
2045
//                                 recv_data_inf.monitoringDataHeader = recvdatabuf[i]->monitoringDataHeader;
2046
                                gettimeofday(&recv_data_inf.arrival_time, NULL);
2047
                                recv_data_inf.firstPacketArrived = recvdatabuf[i]->firstPacketArrived;
2048
                                recv_data_inf.nrMissingFragments = nrMissingFragments;
2049
                                recv_data_inf.nrFragments = recvdatabuf[i]->nrFragments;
2050
                                recv_data_inf.priority = false;
2051
                                recv_data_inf.padding = false;
2052
                                recv_data_inf.confirmation = false;
2053
                                recv_data_inf.reliable = false;
2054

2055
                                // send data recv callback to monitoring module
2056

2057
                                (get_Recv_data_inf_cb) ((void *) &recv_data_inf);
2058
                        }
2059

2060

2061
                        // free the allocated memory
2062
                        free(recvdatabuf[i]);
2063
                        recvdatabuf[i] = NULL;
2064

2065
                        returnValue = 1;
2066
                        break;
2067

2068
                    }
2069

2070
                    if (recvdatabuf[i] != NULL) {
2071

2072
                        if (timepass > timeout) {
2073

2074
                            info("ML: recv_data timeout called  \n");
2075

2076
                            // some data about the missing chunks should
2077
                            // be added here
2078
                            // exchange the pointers
2079
                            int buffersize = 0;
2080
                            buffersize = recvdatabuf[i]->bufsize;
2081
                            *bufsize = buffersize;
2082
                            // recvbuf = recvdatabuf[i]->recvbuf;
2083

2084
                            double nrMissFrags =
2085
                                (double) recvdatabuf[i]->nrFragments /
2086
                                (double) recvdatabuf[i]->recvFragments;
2087
                            int nrMissingFragments =
2088
                                (int) ceil(nrMissFrags);
2089

2090
                            // debug(" recvbuf %s \n",recvbuf );
2091

2092
                            memcpy(recvbuf, recvdatabuf[i]->recvbuf,
2093
                                   buffersize);
2094

2095
                            rParams->nrMissingFragments =
2096
                                nrMissingFragments;
2097
                            rParams->nrFragments =
2098
                                recvdatabuf[i]->nrFragments;
2099
                            rParams->msgtype = recvdatabuf[i]->msgtype;
2100
                            rParams->connectionID =
2101
                                recvdatabuf[i]->connectionID;
2102

2103
                                if(get_Recv_data_inf_cb != NULL) {
2104
                                        mon_data_inf recv_data_inf;
2105

2106
                                        recv_data_inf.remote_socketID = &(connectbuf[connectionID]->external_socketID);
2107
                                        recv_data_inf.buffer = recvdatabuf[i]->recvbuf;
2108
                                        recv_data_inf.bufSize = recvdatabuf[i]->bufsize;
2109
                                        recv_data_inf.msgtype = recvdatabuf[i]->msgtype;
2110
                                        recv_data_inf.monitoringHeaderType = recvdatabuf[i]->monitoringHeaderType;
2111
                                        recv_data_inf.monitoringDataHeader = recvdatabuf[i]->monitoringDataHeader;
2112
                                        gettimeofday(&recv_data_inf.arrival_time, NULL);
2113
                                        recv_data_inf.firstPacketArrived = recvdatabuf[i]->firstPacketArrived;
2114
                                        recv_data_inf.nrMissingFragments = nrMissingFragments;
2115
                                        recv_data_inf.nrFragments = recvdatabuf[i]->nrFragments;
2116
                                        recv_data_inf.priority = false;
2117
                                        recv_data_inf.padding = false;
2118
                                        recv_data_inf.confirmation = false;
2119
                                        recv_data_inf.reliable = false;
2120

2121
                                        // send data recv callback to monitoring module
2122

2123
                                        (get_Recv_data_inf_cb) ((void *) &recv_data_inf);
2124
                                }
2125

2126
                            // free the allocated memory
2127
                            free(recvdatabuf[i]);
2128
                            recvdatabuf[i] = NULL;
2129

2130
                            returnValue = 1;
2131
                            break;
2132

2133
                        }
2134
                    }
2135

2136
                }
2137

2138
            }
2139
            // debug("2 recvbuf %s \n ",recvbuf);
2140
        }
2141
        return returnValue;
2142
    }
2143
#endif
2144

    
2145
}
2146

    
2147
int mlSocketIDToString(socketID_handle socketID,char* socketID_string, size_t len){
2148

    
2149
        char internal_addr[INET_ADDRSTRLEN];
2150
        char external_addr[INET_ADDRSTRLEN];
2151

    
2152
        assert(socketID);
2153

    
2154
        inet_ntop(AF_INET, &(socketID->internal_addr.udpaddr.sin_addr.s_addr), internal_addr, INET_ADDRSTRLEN);
2155
        inet_ntop(AF_INET, &(socketID->external_addr.udpaddr.sin_addr.s_addr), external_addr, INET_ADDRSTRLEN);
2156

    
2157
        snprintf(socketID_string,len,"%s:%d-%s:%d", internal_addr, ntohs(socketID->internal_addr.udpaddr.sin_port),
2158
                external_addr,        ntohs(socketID->external_addr.udpaddr.sin_port));
2159
        return 0;
2160

    
2161
}
2162

    
2163
int mlStringToSocketID(const char* socketID_string, socketID_handle socketID){
2164

    
2165
        //@TODO add checks against malformed string
2166
        char external_addr[INET_ADDRSTRLEN];
2167
        int external_port;
2168
        char internal_addr[INET_ADDRSTRLEN];
2169
        int internal_port;
2170

    
2171
        char *pch;
2172
        char *s = strdup(socketID_string);
2173

    
2174
        //replace ':' with a blank
2175
        pch=strchr(s,':');
2176
        while (pch!=NULL){
2177
                                *pch = ' ';
2178
                pch=strchr(pch+1,':');
2179
        }
2180
        pch=strchr(s,'-');
2181
        if(pch) *pch = ' ';
2182

    
2183
        sscanf(s,"%s %d %s %d", internal_addr, &internal_port,
2184
                external_addr, &external_port);
2185

    
2186
        //set structure to 0, we initialize each byte, since it will be sent on the net later
2187
        memset(socketID, 0, sizeof(struct _socket_ID));
2188

    
2189
        if(inet_pton(AF_INET, internal_addr, &(socketID->internal_addr.udpaddr.sin_addr)) == 0)
2190
                return EINVAL;
2191
        socketID->internal_addr.udpaddr.sin_family = AF_INET;
2192
        socketID->internal_addr.udpaddr.sin_port = htons(internal_port);
2193

    
2194

    
2195
        if(inet_pton(AF_INET, external_addr, &(socketID->external_addr.udpaddr.sin_addr)) ==0)
2196
                return EINVAL;
2197
        socketID->external_addr.udpaddr.sin_family = AF_INET;
2198
        socketID->external_addr.udpaddr.sin_port = htons(external_port);
2199

    
2200
        free(s);
2201
        return 0;
2202

    
2203
}
2204

    
2205
int mlGetConnectionStatus(int connectionID){
2206

    
2207
        if(connectbuf[connectionID])
2208
                return connectbuf[connectionID]->status == READY;
2209
        return -1;
2210
    
2211
}
2212

    
2213

    
2214
int mlConnectionExist(socketID_handle socketID, bool ready){
2215

    
2216
    /*
2217
     * check if another connection for the external connectionID exist
2218
     * that was established \ within the last 2 seconds
2219
     */
2220
        int i;
2221
        for (i = 0; i < CONNECTBUFSIZE; i++)
2222
                if (connectbuf[i] != NULL)
2223
                        if (mlCompareSocketIDs(&(connectbuf[i]->external_socketID), socketID) == 0) {
2224
                                if (ready) return (connectbuf[i]->status == READY ? i : -1);;
2225
                                return i;
2226
                                }
2227

    
2228
    return -1;
2229

    
2230
}
2231

    
2232
//Added by Robert Birke as comodity functions
2233

    
2234
//int mlPrintSocketID(socketID_handle socketID) {
2235
//        char str[SOCKETID_STRING_SIZE];
2236
//        mlSocketIDToString(socketID, str, sizeof(str));
2237
//        printf(stderr,"int->%s<-ext\n",str);
2238
//}
2239

    
2240
/*
2241
 * hash code of a socketID
2242
 * TODO might think of a better way
2243
 */
2244
int mlHashSocketID(socketID_handle sock) {
2245
        //assert(sock);
2246
   return sock->internal_addr.udpaddr.sin_port +
2247
                        sock->external_addr.udpaddr.sin_port;
2248
}
2249

    
2250
int mlCompareSocketIDs(socketID_handle sock1, socketID_handle sock2) {
2251

    
2252
        assert(sock1 && sock2);
2253

    
2254
        /*
2255
        * compare internal addr
2256
        */
2257
        if(sock1 == NULL || sock2 == NULL)
2258
                return 1;
2259

    
2260
        if (sock1->internal_addr.udpaddr.sin_addr.s_addr !=
2261
            sock2->internal_addr.udpaddr.sin_addr.s_addr)
2262
                        return 1;
2263

    
2264
        if (sock1->internal_addr.udpaddr.sin_port !=
2265
                 sock2->internal_addr.udpaddr.sin_port)
2266
                        return 1;
2267

    
2268
        /*
2269
        * compare external addr
2270
        */
2271
        if (sock1->external_addr.udpaddr.sin_addr.s_addr !=
2272
            sock2->external_addr.udpaddr.sin_addr.s_addr)
2273
                        return 1;
2274

    
2275
        if (sock1->external_addr.udpaddr.sin_port !=
2276
                 sock2->external_addr.udpaddr.sin_port)
2277
                        return 1;
2278

    
2279
        return 0;
2280
}
2281

    
2282
int mlCompareSocketIDsByPort(socketID_handle sock1, socketID_handle sock2)
2283
{
2284
        if(sock1 == NULL || sock2 == NULL)
2285
                return 1;
2286
 
2287
        if (sock1->internal_addr.udpaddr.sin_port !=
2288
                 sock2->internal_addr.udpaddr.sin_port)
2289
                        return 1;
2290

    
2291
        if (sock1->external_addr.udpaddr.sin_port !=
2292
                 sock2->external_addr.udpaddr.sin_port)
2293
                        return 1;
2294
        return 0;
2295
}
2296

    
2297
int mlGetPathMTU(int ConnectionId) {
2298
        if(ConnectionId < 0 || ConnectionId >= CONNECTBUFSIZE)
2299
                return -1;
2300
        if (connectbuf[ConnectionId] != NULL)
2301
                return connectbuf[ConnectionId]->pmtusize;
2302
        return -1;
2303
}
2304

    
2305
/**************************** END of GENERAL functions *************************/
2306

    
2307
/**************************** NAT functions *************************/
2308

    
2309
/* setter  */
2310
void mlSetStunServer(const int port,const char *ipaddr){
2311

    
2312
        stun_server.sin_family = AF_INET;
2313
        if (ipaddr == NULL)
2314
                stun_server.sin_addr.s_addr = htonl(INADDR_NONE);
2315
        else
2316
                stun_server.sin_addr.s_addr = resolve(ipaddr);
2317
        stun_server.sin_port = htons(port);
2318

    
2319
}
2320

    
2321
int mlGetExternalIP(char* external_addr){
2322

    
2323
        socketaddrgen udpgen;
2324
        struct sockaddr_in udpaddr;
2325

    
2326
        udpgen = local_socketID.external_addr;
2327
        udpaddr = udpgen.udpaddr;
2328

    
2329
        inet_ntop(AF_INET, &(udpaddr.sin_addr), external_addr,
2330
                        INET_ADDRSTRLEN);
2331

    
2332
        if (external_addr == NULL) {
2333

    
2334
        return -1;
2335

    
2336
        } else {
2337

    
2338
        return 0;
2339

    
2340
        }
2341

    
2342
}
2343

    
2344
/**************************** END of NAT functions *************************/