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1
/*
2
 *          Policy Management
3
 *
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 *          NEC Europe Ltd. PROPRIETARY INFORMATION
5
 *
6
 * This software is supplied under the terms of a license agreement
7
 * or nondisclosure agreement with NEC Europe Ltd. and may not be
8
 * copied or disclosed except in accordance with the terms of that
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 * agreement.
10
 *
11
 *      Copyright (c) 2009 NEC Europe Ltd. All Rights Reserved.
12
 *
13
 * Authors: Kristian Beckers  <beckers@nw.neclab.eu>
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 *          Sebastian Kiesel  <kiesel@nw.neclab.eu>
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 *          
16
 *
17
 * NEC Europe Ltd. DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED,
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 * INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY
19
 * AND FITNESS FOR A PARTICULAR PURPOSE AND THE WARRANTY AGAINST LATENT
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 * DEFECTS, WITH RESPECT TO THE PROGRAM AND THE ACCOMPANYING
21
 * DOCUMENTATION.
22
 *
23
 * 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
26
 * OF BUSINESS PROFITS, BUSINESS INTERRUPTION, LOSS OF INFORMATION, OR
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 * OTHER PECUNIARY LOSS AND INDIRECT, CONSEQUENTIAL, INCIDENTAL,
28
 * ECONOMIC OR PUNITIVE DAMAGES) ARISING OUT OF THE USE OF OR INABILITY
29
 * TO USE THIS PROGRAM, EVEN IF NEC Europe Ltd. HAS BEEN ADVISED OF THE
30
 * POSSIBILITY OF SUCH DAMAGES.
31
 *
32
 *     THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
33
 */
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35
#include <arpa/inet.h>
36
#ifndef WIN32
37
#include <netinet/in.h>
38
#include <sys/socket.h>
39
#endif
40
#include <fcntl.h>
41
#include <event2/event.h>
42
#include <stdlib.h>
43
#include <unistd.h>
44
#include <stdio.h>
45
#include <stddef.h>
46
#include <stdint.h>
47
#include <string.h>
48
#include <sys/types.h>
49
#include <arpa/inet.h>
50
#include <netdb.h>
51
#include <errno.h>
52
#include <time.h>
53
#include <math.h>
54
#include "msg_types.h"
55
#include "util/udpSocket.h"
56
#include "util/stun.h"
57
#include "transmissionHandler.h"
58

    
59
#define LOG_MODULE "[ml] "
60
#include "ml_log.h"
61

    
62
/**************************** START OF INTERNALS ***********************/
63

    
64
/*
65
 * a pointer to a libevent instance
66
 */
67
struct event_base *base;
68

    
69
/*
70
 * define the nr of connections the messaging layer can handle
71
 */
72
#define CONNECTBUFSIZE 10000
73
/*
74
 * define the nr of data that can be received parallel
75
 */
76
#define RECVDATABUFSIZE 10000
77
/*
78
 * define an array for message multiplexing
79
 */
80
#define MSGMULTIPLEXSIZE 127
81

    
82

    
83
/*
84
 * timeout before thinking that the STUN server can't be connected
85
 */
86
#define NAT_TRAVERSAL_TIMEOUT { 1, 0 }
87

    
88
/*
89
 * timeout before thinking of an mtu problem (check MAX_TRIALS as well)
90
 */
91
#define PMTU_TIMEOUT { 0, 250000 }
92

    
93
/*
94
 * retry sending connection messages this many times before reducing pmtu
95
 */
96
#define MAX_TRIALS 3
97

    
98
/*
99
 * default timeout value between the first and the last received packet of a message
100
 */
101
#define RECV_TIMEOUT_DEFAULT { 2, 0 }
102

    
103
/*
104
 * global variables
105
 */
106
/*
107
 * define a buffer of pointers to connect structures
108
 */
109
connect_data *connectbuf[CONNECTBUFSIZE];
110

    
111
/*
112
 * define a pointer buffer with pointers to recv_data structures
113
 */
114
recvdata *recvdatabuf[RECVDATABUFSIZE];
115

    
116
/*
117
 * define a pointer buffer for message multiplexing
118
 */
119
receive_data_cb recvcbbuf[MSGMULTIPLEXSIZE];
120

    
121
/*
122
 * stun server address
123
 */
124
struct sockaddr_in stun_server;
125

    
126
/*
127
 * receive timeout
128
 */
129
static struct timeval recv_timeout = RECV_TIMEOUT_DEFAULT;
130

    
131
/*
132
 * boolean NAT traversal successful if true
133
 */
134
boolean NAT_traversal;
135

    
136
/*
137
 * file descriptor for local socket
138
 */
139
evutil_socket_t socketfd;
140

    
141
/*
142
 * local socketID
143
 */
144
socket_ID local_socketID;
145

    
146
socketID_handle loc_socketID = &local_socketID;
147

    
148
/*
149
 * callback function pointers
150
 */
151
/*
152
 * monitoring module callbacks
153
 */
154
get_recv_pkt_inf_cb get_Recv_pkt_inf_cb = NULL;
155
get_send_pkt_inf_cb get_Send_pkt_inf_cb = NULL;
156
set_monitoring_header_pkt_cb set_Monitoring_header_pkt_cb = NULL;
157
get_recv_data_inf_cb get_Recv_data_inf_cb = NULL;
158
get_send_data_inf_cb get_Send_data_inf_cb = NULL;
159
set_monitoring_header_data_cb set_Monitoring_header_data_cb = NULL;
160
/*
161
 * connection callbacks
162
 */
163
receive_connection_cb receive_Connection_cb = NULL;
164
connection_failed_cb failed_Connection_cb = NULL;
165
/*
166
 * local socketID callback
167
 */
168
receive_localsocketID_cb receive_SocketID_cb;
169

    
170
/*
171
 * boolean that defines if received data is transmitted to the upper layer
172
 * via callback or via upper layer polling
173
 */
174
boolean recv_data_callback;
175

    
176
/*
177
 * helper function to get rid of a warning
178
 */
179
int min(int a, int b) {
180
        if (a > b) return b;
181
        return a;
182
}
183

    
184
/*
185
 * convert a socketID to a string. It uses a static buffer, so either strdup is needed, or the string will get lost!
186
 */
187
const char *conid_to_string(int con_id)
188
{
189
        static char s[INET_ADDRSTRLEN+1+5+1+INET_ADDRSTRLEN+1+5+1];
190
        mlSocketIDToString(&connectbuf[con_id]->external_socketID, s, sizeof(s));
191
        return s;
192
}
193

    
194
void register_recv_localsocketID_cb(receive_localsocketID_cb local_socketID_cb)
195
{
196
        if (local_socketID_cb == NULL)
197
                error("ML : Register receive_localsocketID_cb: NULL ptr \n");
198
        else
199
        receive_SocketID_cb = local_socketID_cb;
200
}
201

    
202

    
203
//void keep_connection_alive(const int connectionID)
204
//{
205
//
206
//    // to be done with the NAT traversal
207
//    // send a message over the wire
208
//    printf("\n");
209
//
210
//}
211

    
212
void unsetStunServer()
213
{
214
        stun_server.sin_addr.s_addr = INADDR_NONE;
215
}
216

    
217
bool isStunDefined()
218
{
219
        return stun_server.sin_addr.s_addr != INADDR_NONE;
220
}
221

    
222
void send_msg(int con_id, int msg_type, char* msg, int msg_len, bool truncable, send_params * sParams) {
223
        socketaddrgen udpgen;
224
        bool retry;
225
        int pkt_len, offset;
226
        struct iovec iov[4];
227

    
228
        char h_pkt[MON_PKT_HEADER_SPACE];
229
        char h_data[MON_DATA_HEADER_SPACE];
230

    
231
        struct msg_header msg_h;
232

    
233
        debug("ML: send_msg to %s conID:%d extID:%d\n", conid_to_string(con_id), con_id, connectbuf[con_id]->external_connectionID);
234

    
235
        iov[0].iov_base = &msg_h;
236
        iov[0].iov_len = MSG_HEADER_SIZE;
237

    
238
        msg_h.local_con_id = con_id;
239
        msg_h.remote_con_id = connectbuf[con_id]->external_connectionID;
240
        msg_h.msg_type = msg_type;
241
        msg_h.msg_seq_num = connectbuf[con_id]->seqnr++;
242

    
243

    
244
        iov[1].iov_len = iov[2].iov_len = 0;
245
        iov[1].iov_base = h_pkt;
246
        iov[2].iov_base = h_data;
247

    
248

    
249
        if (connectbuf[con_id]->internal_connect)
250
                udpgen = connectbuf[con_id]->external_socketID.internal_addr;
251
        else
252
                udpgen = connectbuf[con_id]->external_socketID.external_addr;
253

    
254
        do{
255
                offset = 0;
256
                retry = false;
257
                // Monitoring layer hook
258
                if(set_Monitoring_header_data_cb != NULL) {
259
                        iov[2].iov_len = ((set_Monitoring_header_data_cb) (&(connectbuf[con_id]->external_socketID), msg_type));
260
                }
261
                msg_h.len_mon_data_hdr = iov[2].iov_len;
262

    
263
                if(get_Send_data_inf_cb != NULL && iov[2].iov_len != 0) {
264
                        mon_data_inf sd_data_inf;
265

    
266
                        memset(h_data, 0, MON_DATA_HEADER_SPACE);
267

    
268
                        sd_data_inf.remote_socketID = &(connectbuf[con_id]->external_socketID);
269
                        sd_data_inf.buffer = msg;
270
                        sd_data_inf.bufSize = msg_len;
271
                        sd_data_inf.msgtype = msg_type;
272
                        sd_data_inf.monitoringDataHeader = iov[2].iov_base;
273
                        sd_data_inf.monitoringDataHeaderLen = iov[2].iov_len;
274
                        sd_data_inf.priority = sParams->priority;
275
                        sd_data_inf.padding = sParams->padding;
276
                        sd_data_inf.confirmation = sParams->confirmation;
277
                        sd_data_inf.reliable = sParams->reliable;
278
                        memset(&sd_data_inf.arrival_time, 0, sizeof(struct timeval));
279

    
280
                        (get_Send_data_inf_cb) ((void *) &sd_data_inf);
281
                }
282

    
283
                do {
284
                        if(set_Monitoring_header_pkt_cb != NULL) {
285
                                iov[1].iov_len = (set_Monitoring_header_pkt_cb) (&(connectbuf[con_id]->external_socketID), msg_type);
286
                        }
287
                        pkt_len = min(connectbuf[con_id]->pmtusize - iov[2].iov_len - iov[1].iov_len - iov[0].iov_len, msg_len - offset) ;
288

    
289
                        iov[3].iov_len = pkt_len;
290
                        iov[3].iov_base = msg + offset;
291

    
292
                        //fill header
293
                        msg_h.len_mon_packet_hdr = iov[1].iov_len;
294
                        msg_h.offset = offset;
295
                        msg_h.msg_length = truncable ? pkt_len : msg_len;
296

    
297
                        //monitoring layer hook
298
                        if(get_Send_pkt_inf_cb != NULL && iov[1].iov_len) {
299
                                mon_pkt_inf pkt_info;
300

    
301
                                memset(h_pkt,0,MON_PKT_HEADER_SPACE);
302

    
303
                                pkt_info.remote_socketID = &(connectbuf[con_id]->external_socketID);
304
                                pkt_info.buffer = msg + offset;
305
                                pkt_info.bufSize = pkt_len;
306
                                pkt_info.msgtype = msg_type;
307
                                pkt_info.dataID = connectbuf[con_id]->seqnr;
308
                                pkt_info.offset = offset;
309
                                pkt_info.datasize = msg_len;
310
                                pkt_info.monitoringHeaderLen = iov[1].iov_len;
311
                                pkt_info.monitoringHeader = iov[1].iov_base;
312
                                pkt_info.ttl = -1;
313
                                memset(&(pkt_info.arrival_time),0,sizeof(struct timeval));
314

    
315
                                (get_Send_pkt_inf_cb) ((void *) &pkt_info);
316
                        }
317

    
318
                        debug("ML: sending packet to %s with rconID:%d lconID:%d\n", conid_to_string(con_id), msg_h.remote_con_id, msg_h.local_con_id);
319
                        switch(sendPacket(socketfd, iov, 4, &udpgen.udpaddr)) {
320
                                case MSGLEN:
321
                                        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), msg_h.remote_con_id, msg_h.local_con_id, msg_len, offset);
322
                                        // TODO: pmtu decremented here, but not in the "truncable" packet. That is currently resent without changing the claimed pmtu. Might need to be changed.
323
                                        connectbuf[con_id]->pmtusize = pmtu_decrement(connectbuf[con_id]->pmtusize);
324
                                        if (connectbuf[con_id]->pmtusize > 0) {
325
                                                connectbuf[con_id]->delay = true;
326
                                                retry = true;
327
                                        }
328
                                        offset = msg_len; // exit the while
329
                                        break;
330
                                case FAILURE:
331
                                        info("ML: sending message failed (to:%s conID:%d lconID:%d msgsize:%d offset:%d)\n", conid_to_string(con_id), msg_h.remote_con_id, msg_h.local_con_id, msg_len, offset);
332
                                        offset = msg_len; // exit the while
333
                                        break;
334
                                case OK:
335
                                        //update
336
                                        offset += pkt_len;
337
                                        //transmit data header only in the first packet
338
                                        iov[2].iov_len = 0;
339
                                        break;
340
                        }
341
                } while(offset != msg_len && !truncable);
342
        } while(retry);
343
}
344

    
345
void pmtu_timeout_cb(int fd, short event, void *arg);
346

    
347
void reschedule_conn_msg(int con_id)
348
{
349
        if (connectbuf[con_id]->timeout_event) {
350
                /* delete old timout */        
351
                event_del(connectbuf[con_id]->timeout_event);
352
                event_free(connectbuf[con_id]->timeout_event);
353
        }
354
        connectbuf[con_id]->timeout_event = event_new(base, -1, EV_TIMEOUT, &pmtu_timeout_cb, (void *) (long)con_id);
355
        evtimer_add(connectbuf[con_id]->timeout_event, &connectbuf[con_id]->timeout_value);
356
}
357

    
358
void send_conn_msg(int con_id, int buf_size, int command_type)
359
{
360
        if (buf_size < sizeof(struct conn_msg)) {
361
                error("ML: requested connection message size is too small\n");
362
                return;
363
        }
364

    
365
        if(connectbuf[con_id]->ctrl_msg_buf == NULL) {
366
                connectbuf[con_id]->ctrl_msg_buf = malloc(buf_size);
367
                memset(connectbuf[con_id]->ctrl_msg_buf, 0, buf_size);
368
        }
369

    
370
        if(connectbuf[con_id]->ctrl_msg_buf == NULL) {
371
                error("ML: can not allocate memory for connection message\n");
372
                return;
373
        }
374

    
375
        struct conn_msg *msg_header = (struct conn_msg*) connectbuf[con_id]->ctrl_msg_buf;
376

    
377
        msg_header->comand_type = command_type;
378
        msg_header->pmtu_size = connectbuf[con_id]->pmtusize;
379

    
380
        memcpy(&(msg_header->sock_id), loc_socketID, sizeof(socket_ID));
381

    
382
        send_msg(con_id, ML_CON_MSG, connectbuf[con_id]->ctrl_msg_buf, buf_size, true, &(connectbuf[con_id]->defaultSendParams));
383
}
384

    
385
void send_conn_msg_with_pmtu_discovery(int con_id, int buf_size, int command_type)
386
{
387
        struct timeval tout = PMTU_TIMEOUT;
388
        connectbuf[con_id]->timeout_value = tout;
389
        connectbuf[con_id]->trials = 1;
390
        send_conn_msg(con_id, buf_size, command_type);
391
        reschedule_conn_msg(con_id);
392
}
393

    
394
void resend_conn_msg(int con_id)
395
{
396
        connectbuf[con_id]->trials++;
397
        send_conn_msg(con_id, connectbuf[con_id]->pmtusize, connectbuf[con_id]->status);
398
        reschedule_conn_msg(con_id);
399
}
400

    
401
void
402
recv_conn_msg(struct msg_header *msg_h, char *msgbuf, int msg_size)
403
{
404
        struct conn_msg *con_msg;
405
        int free_con_id, con_id;
406

    
407
        time_t now = time(NULL);
408
        double timediff = 0.0;
409
        char str[1000];
410
        
411
        msgbuf += msg_h->len_mon_data_hdr;
412
        msg_size -= msg_h->len_mon_data_hdr;
413
        con_msg = (struct conn_msg *)msgbuf;
414
        
415
        // Monitoring layer hook
416
        if(get_Recv_data_inf_cb != NULL) {
417
                // update pointer to the real data
418
                mon_data_inf recv_data_inf;
419
                recv_data_inf.remote_socketID = &(con_msg->sock_id);
420
                recv_data_inf.buffer = msgbuf;
421
                recv_data_inf.bufSize = msg_size;
422
                recv_data_inf.msgtype = msg_h->msg_type;
423
                recv_data_inf.monitoringDataHeaderLen = msg_h->len_mon_data_hdr;
424
                recv_data_inf.monitoringDataHeader = msg_h->len_mon_data_hdr ? msgbuf : NULL;
425
                gettimeofday(&recv_data_inf.arrival_time, NULL);
426
                recv_data_inf.firstPacketArrived = true;
427
                recv_data_inf.recvFragments = 1;
428
                recv_data_inf.priority = false;
429
                recv_data_inf.padding = false;
430
                recv_data_inf.confirmation = false;
431
                recv_data_inf.reliable = false;
432

    
433
                // send data recv callback to monitoring module
434
                (get_Recv_data_inf_cb) ((void *) &recv_data_inf);
435
        }
436

    
437
        //decode sock_id for debug messages
438
        mlSocketIDToString(&con_msg->sock_id,str,999);
439

    
440
        // check the connection command type
441
        switch (con_msg->comand_type) {
442
                /*
443
                * if INVITE: enter a new socket make new entry in connect array
444
                * send an ok
445
                */
446
                case INVITE:
447
                        info("ML: received INVITE from %s (size:%d)\n", str, msg_size);
448
                        /*
449
                        * check if another connection for the external connectionID exist
450
                        * that was established within the last 2 seconds
451
                        */
452
                        free_con_id = -1;
453
                        for (con_id = 0; con_id < CONNECTBUFSIZE; con_id++) {
454
                                if (connectbuf[con_id] != NULL) {
455
                                        if (mlCompareSocketIDs(&(connectbuf[con_id]->external_socketID), &(con_msg->sock_id)) == 0) {
456
                                                //timediff = difftime(now, connectbuf[con_id]->starttime);        //TODO: why this timeout? Shouldn't the connection be closed instead if there is a timeout?
457
                                                //if (timediff < 2)
458
                                                //update remote connection ID
459
                                                if (connectbuf[con_id]->external_connectionID != msg_h->local_con_id) {
460
                                                        warn("ML: updating remote connection ID for %s: from %d to %d\n",str, connectbuf[con_id]->external_connectionID, msg_h->local_con_id);
461
                                                        connectbuf[con_id]->external_connectionID = msg_h->local_con_id;
462
                                                }
463
                                                break;
464
                                        }
465
                                } else if(free_con_id == -1)
466
                                        free_con_id = con_id;
467
                        }
468

    
469
                        if (con_id == CONNECTBUFSIZE) {
470
                                // create an entry in the connecttrybuf
471
                                if(free_con_id == -1) {
472
                                        error("ML: no new connect_buf available\n");
473
                                        return;
474
                                }
475
                                connectbuf[free_con_id] = (connect_data *) malloc(sizeof(connect_data));
476
                                memset(connectbuf[free_con_id],0,sizeof(connect_data));
477
                                connectbuf[free_con_id]->connection_head = connectbuf[free_con_id]->connection_last = NULL;
478
                                connectbuf[free_con_id]->starttime = time(NULL);
479
                                memcpy(&(connectbuf[free_con_id]->external_socketID), &(con_msg->sock_id), sizeof(socket_ID));
480
                                connectbuf[free_con_id]->pmtusize = con_msg->pmtu_size;        // bootstrap pmtu from the other's size. Not strictly needed, but a good hint
481
                                connectbuf[free_con_id]->timeout_event = NULL;
482
                                connectbuf[free_con_id]->external_connectionID = msg_h->local_con_id;
483
                                connectbuf[free_con_id]->internal_connect =
484
                                        !compare_external_address_socketIDs(&(con_msg->sock_id), loc_socketID);
485
                                con_id = free_con_id;
486
                        }
487

    
488
                        //if(connectbuf[con_id]->status <= CONNECT) { //TODO: anwer anyway. Why the outher would invite otherwise?
489
                                //update status and send back answer
490
                                connectbuf[con_id]->status = CONNECT;
491
                                send_conn_msg_with_pmtu_discovery(con_id, con_msg->pmtu_size, CONNECT);
492
                        //}
493
                        break;
494
                case CONNECT:
495
                        info("ML: received CONNECT from %s (size:%d)\n", str, msg_size);
496

    
497
                        if(msg_h->remote_con_id != -1 && connectbuf[msg_h->remote_con_id] == NULL) {
498
                                error("ML: received CONNECT for inexistent connection rconID:%d\n",msg_h->remote_con_id);
499
                                return;
500
                        }
501

    
502
                        /*
503
                        * check if the connection status is not already 1 or 2
504
                        */
505
                        if (connectbuf[msg_h->remote_con_id]->status == INVITE) {
506
                                // set the external connectionID
507
                                connectbuf[msg_h->remote_con_id]->external_connectionID = msg_h->local_con_id;
508
                                // change status con_msg the connection_data
509
                                connectbuf[msg_h->remote_con_id]->status = READY;
510
                                // change pmtusize in the connection_data: not needed. receiving a CONNECT means our INVITE went through. So why change pmtu?
511
                                //connectbuf[msg_h->remote_con_id]->pmtusize = con_msg->pmtu_size;
512

    
513
                                // send the READY
514
                                send_conn_msg_with_pmtu_discovery(msg_h->remote_con_id, con_msg->pmtu_size, READY);
515

    
516
                                if (receive_Connection_cb != NULL)
517
                                        (receive_Connection_cb) (msg_h->remote_con_id, NULL);
518

    
519
                                // call all registered callbacks
520
                                while(connectbuf[msg_h->remote_con_id]->connection_head != NULL) {
521
                                        struct receive_connection_cb_list *temp;
522
                                        temp = connectbuf[msg_h->remote_con_id]->connection_head;
523
                                        (temp->connection_cb) (msg_h->remote_con_id, temp->arg);
524
                                        connectbuf[msg_h->remote_con_id]->connection_head = temp->next;
525
                                        free(temp);
526
                                }
527
                                connectbuf[msg_h->remote_con_id]->connection_head =
528
                                        connectbuf[msg_h->remote_con_id]->connection_last = NULL;
529
                        } else {
530
                                // send the READY
531
                                send_conn_msg_with_pmtu_discovery(msg_h->remote_con_id, con_msg->pmtu_size, READY);
532
                        }
533

    
534
                        debug("ML: active connection established\n");
535
                        break;
536

    
537
                        /*
538
                        * if READY: find the entry in the connection array set the
539
                        * connection active change the pmtu size
540
                        */
541
                case READY:
542
                        info("ML: received READY from %s (size:%d)\n", str, msg_size);
543
                        if(connectbuf[msg_h->remote_con_id] == NULL) {
544
                                error("ML: received READY for inexistent connection\n");
545
                                return;
546
                        }
547
                        /*
548
                        * checks if the connection is not already established
549
                        */
550
                        if (connectbuf[msg_h->remote_con_id]->status == CONNECT) {
551
                                // change status of the connection
552
                                connectbuf[msg_h->remote_con_id]->status = READY;
553
                                // change pmtusize: not needed. pmtu doesn't have to be symmetric
554
                                //connectbuf[msg_h->remote_con_id]->pmtusize = con_msg->pmtu_size;
555

    
556
                                if (receive_Connection_cb != NULL)
557
                                        (receive_Connection_cb) (msg_h->remote_con_id, NULL);
558

    
559
                                while(connectbuf[msg_h->remote_con_id]->connection_head != NULL) {
560
                                        struct receive_connection_cb_list *temp;
561
                                        temp = connectbuf[msg_h->remote_con_id]->connection_head;
562
                                        (temp->connection_cb) (msg_h->remote_con_id, temp->arg);
563
                                        connectbuf[msg_h->remote_con_id]->connection_head = temp->next;
564
                                        free(temp);
565
                                }
566
                                connectbuf[msg_h->remote_con_id]->connection_head =
567
                                        connectbuf[msg_h->remote_con_id]->connection_last = NULL;
568
                                debug("ML: passive connection established\n");
569
                        }
570
                        break;
571
        }
572
}
573

    
574
void recv_stun_msg(char *msgbuf, int recvSize)
575
{
576
        /*
577
        * create empty stun message struct
578
        */
579
        StunMessage resp;
580
        memset(&resp, 0, sizeof(StunMessage));
581
        /*
582
        * parse the message
583
        */
584
        int returnValue = 0;
585
        returnValue = recv_stun_message(msgbuf, recvSize, &resp);
586

    
587
        if (returnValue == 0) {
588
                /*
589
                * read the reflexive Address into the local_socketID
590
                */
591
                struct sockaddr_in reflexiveAddr = {0};
592
                reflexiveAddr.sin_family = AF_INET;
593
                reflexiveAddr.sin_addr.s_addr = htonl(resp.mappedAddress.ipv4.addr);
594
                reflexiveAddr.sin_port = htons(resp.mappedAddress.ipv4.port);
595
                socketaddrgen reflexiveAddres = {0};
596
                reflexiveAddres.udpaddr = reflexiveAddr;
597
                local_socketID.external_addr = reflexiveAddres;
598
                NAT_traversal = true;
599
                // callback to the upper layer indicating that the socketID is now
600
                // ready to use
601
                (receive_SocketID_cb) (&local_socketID, 0);
602
        }
603
}
604

    
605
//done
606
void recv_timeout_cb(int fd, short event, void *arg)
607
{
608
        int recv_id = (long) arg;
609
        debug("ML: recv_timeout_cb called. Timeout for id:%d\n",recv_id);
610

    
611
        if (recvdatabuf[recv_id] == NULL) {
612
                return;
613
        }
614

    
615

    
616
/*        if(recvdatabuf[recv_id]->status == ACTIVE) {
617
                //TODO make timeout at least a DEFINE
618
                struct timeval timeout = { 4, 0 };
619
                recvdatabuf[recv_id]->status = INACTIVE;
620
                event_base_once(base, -1, EV_TIMEOUT, recv_timeout_cb,
621
                        arg, &timeout);
622
                return;
623
        }
624
*/
625

    
626
        if(recvdatabuf[recv_id]->status == ACTIVE) {
627
                // Monitoring layer hook
628
                if(get_Recv_data_inf_cb != NULL) {
629
                        mon_data_inf recv_data_inf;
630

    
631
                        recv_data_inf.remote_socketID =
632
                                        &(connectbuf[recvdatabuf[recv_id]->connectionID]->external_socketID);
633
                        recv_data_inf.buffer = recvdatabuf[recv_id]->recvbuf;
634
                        recv_data_inf.bufSize = recvdatabuf[recv_id]->bufsize;
635
                        recv_data_inf.msgtype = recvdatabuf[recv_id]->msgtype;
636
                        recv_data_inf.monitoringDataHeaderLen = recvdatabuf[recv_id]->monitoringDataHeaderLen;
637
                        recv_data_inf.monitoringDataHeader = recvdatabuf[recv_id]->monitoringDataHeaderLen ?
638
                                recvdatabuf[recv_id]->recvbuf : NULL;
639
                        gettimeofday(&recv_data_inf.arrival_time, NULL);
640
                        recv_data_inf.firstPacketArrived = recvdatabuf[recv_id]->firstPacketArrived;
641
                        recv_data_inf.recvFragments = recvdatabuf[recv_id]->recvFragments;
642
                        recv_data_inf.priority = false;
643
                        recv_data_inf.padding = false;
644
                        recv_data_inf.confirmation = false;
645
                        recv_data_inf.reliable = false;
646

    
647
                        // send data recv callback to monitoring module
648

    
649
                        (get_Recv_data_inf_cb) ((void *) &recv_data_inf);
650
                }
651

    
652
                // Get the right callback
653
                receive_data_cb receive_data_callback = recvcbbuf[recvdatabuf[recv_id]->msgtype];
654

    
655
                recv_params rParams;
656

    
657
                rParams.nrMissingBytes = recvdatabuf[recv_id]->bufsize - recvdatabuf[recv_id]->arrivedBytes;
658
                rParams.recvFragments = recvdatabuf[recv_id]->recvFragments;
659
                rParams.msgtype = recvdatabuf[recv_id]->msgtype;
660
                rParams.connectionID = recvdatabuf[recv_id]->connectionID;
661
                rParams.remote_socketID =
662
                        &(connectbuf[recvdatabuf[recv_id]->connectionID]->external_socketID);
663
                rParams.firstPacketArrived = recvdatabuf[recv_id]->firstPacketArrived;
664

    
665
                (receive_data_callback) (recvdatabuf[recv_id]->recvbuf + recvdatabuf[recv_id]->monitoringDataHeaderLen, recvdatabuf[recv_id]->bufsize - recvdatabuf[recv_id]->monitoringDataHeaderLen,
666
                        recvdatabuf[recv_id]->msgtype, &rParams);
667

    
668
                //clean up
669
                if (recvdatabuf[recv_id]->timeout_event) {
670
                        event_del(recvdatabuf[recv_id]->timeout_event);
671
                        event_free(recvdatabuf[recv_id]->timeout_event);
672
                        recvdatabuf[recv_id]->timeout_event = NULL;
673
                }
674
                free(recvdatabuf[recv_id]->recvbuf);
675
                free(recvdatabuf[recv_id]);
676
                recvdatabuf[recv_id] = NULL;
677
        }
678
}
679

    
680
// process a single recv data message
681
void recv_data_msg(struct msg_header *msg_h, char *msgbuf, int bufsize)
682
{
683
        debug("ML: received packet of size %d with rconID:%d lconID:%d type:%d offset:%d\n",bufsize,msg_h->remote_con_id,msg_h->local_con_id,msg_h->msg_type,msg_h->offset);
684

    
685
        int recv_id, free_recv_id = -1;
686

    
687
        if(connectbuf[msg_h->remote_con_id] == NULL) {
688
                debug("ML: Received a message not related to any opened connection!\n");
689
                return;
690
        }
691

    
692
        // check if a recv_data exist and enter data
693
        for (recv_id = 0; recv_id < RECVDATABUFSIZE; recv_id++)
694
                if (recvdatabuf[recv_id] != NULL) {
695
                        if (msg_h->remote_con_id == recvdatabuf[recv_id]->connectionID &&
696
                                        msg_h->msg_seq_num == recvdatabuf[recv_id]->seqnr)
697
                                                break;
698
                } else
699
                        if(free_recv_id == -1)
700
                                free_recv_id = recv_id;
701

    
702

    
703
        if(recv_id == RECVDATABUFSIZE) {
704
                //no recv_data found: create one
705
                recv_id = free_recv_id;
706
                recvdatabuf[recv_id] = (recvdata *) malloc(sizeof(recvdata));
707
                memset(recvdatabuf[recv_id], 0, sizeof(recvdata));
708
                recvdatabuf[recv_id]->connectionID = msg_h->remote_con_id;
709
                recvdatabuf[recv_id]->seqnr = msg_h->msg_seq_num;
710
                recvdatabuf[recv_id]->monitoringDataHeaderLen = msg_h->len_mon_data_hdr;
711
                recvdatabuf[recv_id]->bufsize = msg_h->msg_length + msg_h->len_mon_data_hdr;
712
                recvdatabuf[recv_id]->recvbuf = (char *) malloc(recvdatabuf[recv_id]->bufsize);
713
                recvdatabuf[recv_id]->arrivedBytes = 0;        //count this without the Mon headers
714
                /*
715
                * read the timeout data and set it
716
                */
717
                recvdatabuf[recv_id]->timeout_value = recv_timeout;
718
                recvdatabuf[recv_id]->timeout_event = NULL;
719
                recvdatabuf[recv_id]->recvID = recv_id;
720
                recvdatabuf[recv_id]->starttime = time(NULL);
721
                recvdatabuf[recv_id]->msgtype = msg_h->msg_type;
722

    
723
                // fill the buffer with zeros
724
                memset(recvdatabuf[recv_id]->recvbuf, 0, recvdatabuf[recv_id]->bufsize);
725
                debug(" new @ id:%d\n",recv_id);
726
        } else {        //message structure already exists, no need to create new
727
                debug(" found @ id:%d (arrived before this packet: bytes:%d fragments%d\n",recv_id, recvdatabuf[recv_id]->arrivedBytes, recvdatabuf[recv_id]->recvFragments);
728
        }
729

    
730
        //if first packet extract mon data header and advance pointer
731
        if (msg_h->offset == 0) {
732
                memcpy(recvdatabuf[recv_id]->recvbuf, msgbuf, msg_h->len_mon_data_hdr);
733
                msgbuf += msg_h->len_mon_data_hdr;
734
                bufsize -= msg_h->len_mon_data_hdr;
735
                recvdatabuf[recv_id]->firstPacketArrived = 1;
736
        }
737

    
738

    
739
        // increment fragmentnr
740
        recvdatabuf[recv_id]->recvFragments++;
741
        // increment the arrivedBytes
742
        recvdatabuf[recv_id]->arrivedBytes += bufsize;
743

    
744
        // enter the data into the buffer
745
        memcpy(recvdatabuf[recv_id]->recvbuf + msg_h->len_mon_data_hdr + msg_h->offset, msgbuf, bufsize);
746

    
747
        //TODO very basic checkif all fragments arrived: has to be reviewed
748
        if(recvdatabuf[recv_id]->arrivedBytes == recvdatabuf[recv_id]->bufsize - recvdatabuf[recv_id]->monitoringDataHeaderLen)
749
                recvdatabuf[recv_id]->status = COMPLETE; //buffer full -> msg completly arrived
750
        else
751
                recvdatabuf[recv_id]->status = ACTIVE;
752

    
753
        if (recv_data_callback) {
754
                if(recvdatabuf[recv_id]->status == COMPLETE) {
755
                        // Monitoring layer hook
756
                        if(get_Recv_data_inf_cb != NULL) {
757
                                mon_data_inf recv_data_inf;
758

    
759
                                recv_data_inf.remote_socketID =
760
                                         &(connectbuf[recvdatabuf[recv_id]->connectionID]->external_socketID);
761
                                recv_data_inf.buffer = recvdatabuf[recv_id]->recvbuf;
762
                                recv_data_inf.bufSize = recvdatabuf[recv_id]->bufsize;
763
                                recv_data_inf.msgtype = recvdatabuf[recv_id]->msgtype;
764
                                recv_data_inf.monitoringDataHeaderLen = recvdatabuf[recv_id]->monitoringDataHeaderLen;
765
                                recv_data_inf.monitoringDataHeader = recvdatabuf[recv_id]->monitoringDataHeaderLen ?
766
                                        recvdatabuf[recv_id]->recvbuf : NULL;
767
                                gettimeofday(&recv_data_inf.arrival_time, NULL);
768
                                recv_data_inf.firstPacketArrived = recvdatabuf[recv_id]->firstPacketArrived;
769
                                recv_data_inf.recvFragments = recvdatabuf[recv_id]->recvFragments;
770
                                recv_data_inf.priority = false;
771
                                recv_data_inf.padding = false;
772
                                recv_data_inf.confirmation = false;
773
                                recv_data_inf.reliable = false;
774

    
775
                                // send data recv callback to monitoring module
776

    
777
                                (get_Recv_data_inf_cb) ((void *) &recv_data_inf);
778
                        }
779

    
780
                        // Get the right callback
781
                        receive_data_cb receive_data_callback = recvcbbuf[msg_h->msg_type];
782
                        if (receive_data_callback) {
783

    
784
                                recv_params rParams;
785

    
786
                                rParams.nrMissingBytes = recvdatabuf[recv_id]->bufsize - recvdatabuf[recv_id]->monitoringDataHeaderLen - recvdatabuf[recv_id]->arrivedBytes;
787
                                rParams.recvFragments = recvdatabuf[recv_id]->recvFragments;
788
                                rParams.msgtype = recvdatabuf[recv_id]->msgtype;
789
                                rParams.connectionID = recvdatabuf[recv_id]->connectionID;
790
                                rParams.remote_socketID =
791
                                        &(connectbuf[recvdatabuf[recv_id]->connectionID]->external_socketID);
792

    
793
                                char str[1000];
794
                                mlSocketIDToString(rParams.remote_socketID,str,999);
795
                                debug("ML: received message from conID:%d, %s\n",recvdatabuf[recv_id]->connectionID,str);
796
                                rParams.firstPacketArrived = recvdatabuf[recv_id]->firstPacketArrived;
797

    
798
                                (receive_data_callback) (recvdatabuf[recv_id]->recvbuf + recvdatabuf[recv_id]->monitoringDataHeaderLen, recvdatabuf[recv_id]->bufsize - recvdatabuf[recv_id]->monitoringDataHeaderLen,
799
                                        recvdatabuf[recv_id]->msgtype, (void *) &rParams);
800
                        } else {
801
                            warn("ML: callback not initialized for this message type: %d!\n",msg_h->msg_type);
802
                        }
803

    
804
                        //clean up
805
                        if (recvdatabuf[recv_id]->timeout_event) {
806
                                debug("ML: freeing timeout for %d",recv_id);
807
                                event_del(recvdatabuf[recv_id]->timeout_event);
808
                                event_free(recvdatabuf[recv_id]->timeout_event);
809
                                recvdatabuf[recv_id]->timeout_event = NULL;
810
                        } else {
811
                                debug("ML: received in 1 packet\n",recv_id);
812
                        }
813
                        free(recvdatabuf[recv_id]->recvbuf);
814
                        free(recvdatabuf[recv_id]);
815
                        recvdatabuf[recv_id] = NULL;
816
                } else { // not COMPLETE
817
                        if (!recvdatabuf[recv_id]->timeout_event) {
818
                                //start time out
819
                                //TODO make timeout at least a DEFINE
820
                                recvdatabuf[recv_id]->timeout_event = event_new(base, -1, EV_TIMEOUT, &recv_timeout_cb, (void *) (long)recv_id);
821
                                evtimer_add(recvdatabuf[recv_id]->timeout_event, &recv_timeout);
822
                        }
823
                }
824
        }
825
}
826

    
827
//done
828
void pmtu_timeout_cb(int fd, short event, void *arg)
829
{
830

    
831
        int con_id = (long) arg;
832
        pmtu new_pmtusize;
833

    
834
        debug("ML: pmtu timeout called (lcon:%d)\n",con_id);
835

    
836
        if(connectbuf[con_id] == NULL) {
837
                error("ML: pmtu timeout called on non existing con_id\n");
838
                return;
839
        }
840

    
841
        if(connectbuf[con_id]->status == READY) {
842
                // nothing to do anymore
843
                event_del(connectbuf[con_id]->timeout_event);
844
                event_free(connectbuf[con_id]->timeout_event);
845
                connectbuf[con_id]->timeout_event = NULL;
846
                return;
847
        }
848

    
849
        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);
850

    
851
        if(connectbuf[con_id]->delay || connectbuf[con_id]->trials == MAX_TRIALS - 1) {
852
                double delay = connectbuf[con_id]->timeout_value.tv_sec + connectbuf[con_id]->timeout_value.tv_usec / 1000000.0;
853
                delay = delay * 2;
854
                info("\tML: increasing pmtu timeout to %f sec\n", delay);
855
                connectbuf[con_id]->timeout_value.tv_sec = floor(delay);
856
                connectbuf[con_id]->timeout_value.tv_usec = fmod(delay, 1.0) * 1000000.0;
857
                if(connectbuf[con_id]->delay) {
858
                        connectbuf[con_id]->delay = false;
859
                        reschedule_conn_msg(con_id);
860
                }
861
        }
862

    
863
        if(connectbuf[con_id]->trials == MAX_TRIALS) {
864
                // decrement the pmtu size
865
                struct timeval tout = PMTU_TIMEOUT;
866
                info("\tML: decreasing pmtu estimate from %d to %d\n", connectbuf[con_id]->pmtusize, pmtu_decrement(connectbuf[con_id]->pmtusize));
867
                connectbuf[con_id]->pmtusize = pmtu_decrement(connectbuf[con_id]->pmtusize);
868
                connectbuf[con_id]->timeout_value = tout; 
869
                connectbuf[con_id]->trials = 0;
870
        }
871

    
872
        //error in PMTU discovery?
873
        if (connectbuf[con_id]->pmtusize == ERROR) {
874
                if (connectbuf[con_id]->internal_connect == true) {
875
                        //as of now we tried directly connecting, now let's try trough the NAT
876
                        connectbuf[con_id]->internal_connect = false;
877
                        connectbuf[con_id]->pmtusize = MAX;
878
                } else {
879
                        //nothing to do we have to give up
880
                        error("ML: Could not create connection with connectionID %i!\n",con_id);
881
                        // envoke the callback for failed connection establishment
882
                        if(failed_Connection_cb != NULL)
883
                                (failed_Connection_cb) (con_id, NULL);
884
                        // delete the connection entry
885
                        mlCloseConnection(con_id);
886
                        return;
887
                }
888
        }
889

    
890
        //retry
891
        resend_conn_msg(con_id);
892
}
893

    
894

    
895
int schedule_pmtu_timeout(int con_id)
896
{
897
        if (! connectbuf[con_id]->timeout_event) {
898
                struct timeval tout = PMTU_TIMEOUT;
899
                connectbuf[con_id]->timeout_value = tout;
900
                connectbuf[con_id]->trials = 1;
901
                connectbuf[con_id]->timeout_event = event_new(base, -1, EV_TIMEOUT, &pmtu_timeout_cb, (void *) (long)con_id);
902
                evtimer_add(connectbuf[con_id]->timeout_event, &connectbuf[con_id]->timeout_value);
903
        }
904
}
905

    
906
/*
907
 * decrements the mtu size
908
 */
909
pmtu pmtu_decrement(pmtu pmtusize)
910
{
911
        pmtu pmtu_return_size;
912
        switch(pmtusize) {
913
        case MAX:
914
                return DSL;
915
        case DSL:
916
                return DSLMEDIUM;
917
        case DSLMEDIUM:
918
                return DSLSLIM;
919
        case DSLSLIM:
920
                return BELOWDSL;
921
        case BELOWDSL:
922
                return MIN;
923
        case MIN:
924
                return ERROR;
925
        default:
926
                warn("ML: strange pmtu size encountered:%d, changing to some safe value:%d\n", pmtusize, MIN);
927
                return MIN;
928
        }
929
}
930

    
931
// called when an ICMP pmtu error message (type 3, code 4) is received
932
void pmtu_error_cb_th(char *msg, int msglen)
933
{
934
        debug("ML: pmtu_error callback called msg_size: %d\n",msglen);
935
        //TODO debug
936
        return;
937

    
938
    char *msgbufptr = NULL;
939
    int msgtype;
940
    int connectionID;
941
    pmtu pmtusize;
942
    pmtu new_pmtusize;
943
    int dead = 0;
944

    
945
    // check the packettype
946
    msgbufptr = &msg[0];
947

    
948
    // check the msgtype
949
    msgbufptr = &msg[1];
950
    memcpy(&msgtype, msgbufptr, 4);
951

    
952
    if (msgtype == 0) {
953

    
954
        // get the connectionID
955
        msgbufptr = &msg[5];
956
        memcpy(&connectionID, msgbufptr, 4);
957

    
958
        int msgtype_c = connectbuf[connectionID]->status;
959
//        pmtusize = connectbuf[connectionID]->pmtutrysize;
960

    
961
        if (msgtype_c != msgtype) {
962
            dead = 1;
963
        }
964

    
965

    
966
    } else if (msgtype == 1) {
967

    
968
        // read the connectionID
969
        msgbufptr = &msg[9];
970
        memcpy(&connectionID, msgbufptr, 4);
971

    
972
        int msgtype_c = connectbuf[connectionID]->status;
973
//        pmtusize = connectbuf[connectionID]->pmtutrysize;
974

    
975
        if (msgtype_c != msgtype) {
976
            dead = 1;
977
        }
978

    
979
    }
980
    // decrement the pmtu size
981
    new_pmtusize = pmtu_decrement(pmtusize);
982

    
983
//    connectbuf[connectionID]->pmtutrysize = new_pmtusize;
984

    
985
    if (new_pmtusize == ERROR) {
986
                error("ML:  Could not create connection with connectionID %i !\n",
987
                        connectionID);
988

    
989
                if(failed_Connection_cb != NULL)
990
                        (failed_Connection_cb) (connectionID, NULL);
991
                // set the message type to a non existent message
992
                msgtype = 2;
993
                // delete the connection entry
994
                 mlCloseConnection(connectionID);
995
        }
996

    
997
    if (msgtype == 0 && dead != 1) {
998

    
999
        // stop the timeout event
1000
        // timeout_del(connectbuf[connectionID]->timeout);
1001
        /*
1002
         * libevent2
1003
         */
1004

    
1005
        // event_del(connectbuf[connectionID]->timeout);
1006

    
1007

    
1008
        // create and send a connection message
1009
//         create_conn_msg(new_pmtusize, connectionID,
1010
//                         &local_socketID, INVITE);
1011

    
1012
//        send_conn_msg(connectionID, new_pmtusize);
1013

    
1014
        // set a timeout event for the pmtu discovery
1015
        // timeout_set(connectbuf[connectionID]->timeout,pmtu_timeout_cb,(void
1016
        // *)&connectionID);
1017

    
1018
        // timeout_add(connectbuf[connectionID]->timeout,&connectbuf[connectionID]->timeout_value);
1019

    
1020
        /*
1021
         * libevent2
1022
         */
1023

    
1024
        struct event *ev;
1025
        ev = evtimer_new(base, pmtu_timeout_cb,
1026
                         (void *) connectbuf[connectionID]);
1027

    
1028
        // connectbuf[connectionID]->timeout = ev;
1029

    
1030
        event_add(ev, &connectbuf[connectionID]->timeout_value);
1031

    
1032
    } else if (msgtype == 1 && dead != 1) {
1033

    
1034
        // stop the timeout event
1035
        // timeout_del(connectbuf[connectionID]->timeout);
1036

    
1037
        /*
1038
         * libevent2
1039
         */
1040
        // info("still here 11 \n");
1041
        // printf("ev %d \n",connectbuf[connectionID]->timeout);
1042
        // event_del(connectbuf[connectionID]->timeout );
1043
        // evtimer_del(connectbuf[connectionID]->timeout );
1044

    
1045

    
1046
//         // create and send a connection message
1047
//         create_conn_msg(new_pmtusize,
1048
//                         connectbuf[connectionID]->connectionID,
1049
//                         NULL, CONNECT);
1050

    
1051
        //send_conn_msg(connectionID, new_pmtusize);
1052

    
1053
        // set a timeout event for the pmtu discovery
1054
        // timeout_set(connectbuf[connectionID]->timeout,pmtu_timeout_cb,(void
1055
        // *)&connectionID);
1056
        // timeout_add(connectbuf[connectionID]->timeout,&connectbuf[connectionID]->timeout_value);
1057

    
1058
        /*
1059
         * libevent2
1060
         */
1061
        // struct event *ev;
1062
        // ev = evtimer_new(base,pmtu_timeout_cb, (void
1063
        // *)connectbuf[connectionID]);
1064
        // connectbuf[connectionID]->timeout = ev;
1065
        // event_add(ev,&connectbuf[connectionID]->timeout_value);
1066

    
1067
    }
1068
}
1069

    
1070
/*
1071
 * what to do once a packet arrived if it is a conn packet send it to
1072
 * recv_conn handler if it is a data packet send it to the recv_data
1073
 * handler
1074
 */
1075

    
1076
//done --
1077
void recv_pkg(int fd, short event, void *arg)
1078
{
1079
        debug("ML: recv_pkg called\n");
1080

    
1081
        struct msg_header *msg_h;
1082
        char msgbuf[MAX];
1083
        pmtu recvSize = MAX;
1084
        char *bufptr = msgbuf;
1085
        int ttl;
1086
        struct sockaddr_in recv_addr;
1087
        int msg_size;
1088

    
1089
        recvPacket(fd, msgbuf, &recvSize, &recv_addr, pmtu_error_cb_th, &ttl);
1090

    
1091

    
1092
        // check if it is not just an ERROR message
1093
        if(recvSize < 0)
1094
                return;
1095

    
1096
        // @TODO check if this simplistic STUN message recognition really always works, probably not
1097
        unsigned short stun_bind_response = 0x0101;
1098
        unsigned short * msgspot = (unsigned short *) msgbuf;
1099
        if (*msgspot == stun_bind_response) {
1100
                debug("ML: recv_pkg: parse stun message called\n");
1101
                recv_stun_msg(msgbuf, recvSize);
1102
                return;
1103
        }
1104

    
1105
        msg_h = (struct msg_header *) msgbuf;
1106

    
1107
        //verify minimum size
1108
        if (recvSize < sizeof(struct msg_header)) {
1109
          info("UDP packet too small, can't be an ML packet");
1110
          return;
1111
        }
1112

    
1113
        //TODO add more verifications
1114

    
1115
        bufptr += MSG_HEADER_SIZE + msg_h->len_mon_packet_hdr;
1116
        msg_size = recvSize - MSG_HEADER_SIZE - msg_h->len_mon_packet_hdr;
1117

    
1118

    
1119
        if(get_Recv_pkt_inf_cb != NULL) {
1120
                mon_pkt_inf msginfNow;
1121
                msginfNow.monitoringHeaderLen = msg_h->len_mon_packet_hdr;
1122
                msginfNow.monitoringHeader = msg_h->len_mon_packet_hdr ? &msgbuf[0] + MSG_HEADER_SIZE : NULL;
1123
                //TODO rethink this ...
1124
                if(msg_h->msg_type == ML_CON_MSG) {
1125
                        struct conn_msg *c_msg = (struct conn_msg *) bufptr;
1126
                        msginfNow.remote_socketID = &(c_msg->sock_id);
1127
                }
1128
                else if(connectbuf[msg_h->remote_con_id] == NULL) {
1129
                        error("ML: received pkg called with non existent connection\n");
1130
                        return;
1131
                } else
1132
                        msginfNow.remote_socketID = &(connectbuf[msg_h->remote_con_id]->external_socketID);
1133
                msginfNow.buffer = bufptr;
1134
                msginfNow.bufSize = recvSize;
1135
                msginfNow.msgtype = msg_h->msg_type;
1136
                msginfNow.ttl = ttl;
1137
                msginfNow.dataID = msg_h->msg_seq_num;
1138
                msginfNow.offset = msg_h->offset;
1139
                msginfNow.datasize = msg_h->msg_length;
1140
                gettimeofday(&msginfNow.arrival_time, NULL);
1141
                (get_Recv_pkt_inf_cb) ((void *) &msginfNow);
1142
        }
1143

    
1144

    
1145
        switch(msg_h->msg_type) {
1146
                case ML_CON_MSG:
1147
                        debug("ML: received conn pkg\n");
1148
                        recv_conn_msg(msg_h, bufptr, msg_size);
1149
                        break;
1150
                default:
1151
                        if(msg_h->msg_type < 127) {
1152
                                debug("ML: received data pkg\n");
1153
                                recv_data_msg(msg_h, bufptr, msg_size);
1154
                                break;
1155
                        }
1156
                        debug("ML: unrecognised msg_type\n");
1157
                        break;
1158
        }
1159
}
1160

    
1161
/*
1162
 * compare the external IP address of two socketIDs
1163
 */
1164
int
1165
compare_external_address_socketIDs(socketID_handle sock1, socketID_handle sock2)
1166
{
1167
        if( sock1->external_addr.udpaddr.sin_addr.s_addr == sock2->external_addr.udpaddr.sin_addr.s_addr)
1168
                return 0;
1169
        return 1;
1170
}
1171

    
1172
void try_stun();
1173

    
1174
/*
1175
 * the timeout of the NAT traversal
1176
 */
1177
void nat_traversal_timeout(int fd, short event, void *arg)
1178
{
1179
        if (NAT_traversal == false) {
1180
                debug("ML: NAT traversal request re-send\n");
1181
                if(receive_SocketID_cb)
1182
                        (receive_SocketID_cb) (&local_socketID, 2);
1183
                try_stun();
1184
        }
1185
}
1186

    
1187
//return IP address, or INADDR_NONE if can't resolve
1188
unsigned long resolve(const char *ipaddr)
1189
{
1190
        struct hostent *h = gethostbyname(ipaddr);
1191
        if (!h) {
1192
                error("ML: Unable to resolve host name %s\n", ipaddr);
1193
                return INADDR_NONE;
1194
        }
1195
        unsigned long *addr = (unsigned long *) (h->h_addr);
1196
        return *addr;
1197
}
1198

    
1199

    
1200
/*
1201
 * returns the file descriptor, or <0 on error. The ipaddr can be a null
1202
 * pointer. Then all available ipaddr on the machine are choosen.
1203
 */
1204
int create_socket(const int port, const char *ipaddr)
1205
{
1206
        struct sockaddr_in udpaddr = {0};
1207
        udpaddr.sin_family = AF_INET;
1208
        if (ipaddr == NULL) {
1209
                /*
1210
                * try to guess the local IP address
1211
                */
1212
                const char *ipaddr_iface = mlAutodetectIPAddress();
1213
                if (ipaddr_iface) {
1214
                        udpaddr.sin_addr.s_addr = inet_addr(ipaddr_iface);
1215
                } else {
1216
                        udpaddr.sin_addr.s_addr = INADDR_ANY;
1217
                }
1218
        } else {
1219
                udpaddr.sin_addr.s_addr = inet_addr(ipaddr);
1220
        }
1221
        udpaddr.sin_port = htons(port);
1222

    
1223
        socketaddrgen udpgen;
1224
        memset(&udpgen,0,sizeof(socketaddrgen));        //this will be sent over the net, so set it to 0
1225
        udpgen.udpaddr = udpaddr;
1226
        local_socketID.internal_addr = udpgen;
1227

    
1228
        socketfd = createSocket(port, ipaddr);
1229
        if (socketfd < 0){
1230
                return socketfd;
1231
        }
1232

    
1233
        struct event *ev;
1234
        ev = event_new(base, socketfd, EV_READ | EV_PERSIST, recv_pkg, NULL);
1235

    
1236
        event_add(ev, NULL);
1237

    
1238
        try_stun();
1239

    
1240
        return socketfd;
1241
}
1242

    
1243
/*
1244
 * try to figure out external IP using STUN, if defined
1245
 */
1246
void try_stun()
1247
{
1248
        if (isStunDefined()) {
1249
                /*
1250
                * send the NAT traversal STUN request
1251
                */
1252
                 send_stun_request(socketfd, &stun_server);
1253

    
1254
                /*
1255
                * enter a NAT traversal timeout that takes care of retransmission
1256
                */
1257
                struct event *ev1;
1258
                struct timeval timeout_value_NAT_traversal = NAT_TRAVERSAL_TIMEOUT;
1259
                ev1 = evtimer_new(base, nat_traversal_timeout, NULL);
1260
                event_add(ev1, &timeout_value_NAT_traversal);
1261

    
1262
                NAT_traversal = false;
1263
        } else {
1264
                /*
1265
                * Assume we have accessibility and copy internal address to external one
1266
                */
1267
                local_socketID.external_addr = local_socketID.internal_addr;
1268
                NAT_traversal = true; // @TODO: this is not really NAT traversal, but a flag that init is over
1269
                // callback to the upper layer indicating that the socketID is now
1270
                // ready to use
1271
                if(receive_SocketID_cb)
1272
                        (receive_SocketID_cb) (&local_socketID, 0); //success
1273
        }
1274
}
1275

    
1276
/**************************** END OF INTERNAL ***********************/
1277

    
1278
/**************************** MONL functions *************************/
1279

    
1280
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){
1281

    
1282
        base = (struct event_base *) arg;
1283
        recv_data_callback = recv_data_cb;
1284
        mlSetRecvTimeout(timeout_value);
1285
        if (stun_ipaddr) {
1286
                 mlSetStunServer(stun_port, stun_ipaddr);
1287
        } else {
1288

    
1289
        }
1290
        register_recv_localsocketID_cb(local_socketID_cb);
1291
        return create_socket(port, ipaddr);
1292
}
1293

    
1294
/* register callbacks  */
1295
void mlRegisterGetRecvPktInf(get_recv_pkt_inf_cb recv_pkt_inf_cb){
1296

    
1297
        if (recv_pkt_inf_cb == NULL)
1298
                error("ML: Register get_recv_pkt_inf_cb failed: NULL ptr  \n");
1299
        else
1300
                get_Recv_pkt_inf_cb = recv_pkt_inf_cb;
1301

    
1302
}
1303

    
1304
void mlRegisterGetSendPktInf(get_send_pkt_inf_cb  send_pkt_inf_cb){
1305

    
1306
        if (send_pkt_inf_cb == NULL)
1307
                error("ML: Register get_send_pkt_inf_cb: NULL ptr  \n");
1308
        else
1309
                get_Send_pkt_inf_cb = send_pkt_inf_cb;
1310

    
1311
}
1312

    
1313

    
1314
void mlRegisterSetMonitoringHeaderPktCb(set_monitoring_header_pkt_cb monitoring_header_pkt_cb ){
1315

    
1316
        if (monitoring_header_pkt_cb == NULL)
1317
                error("ML: Register set_monitoring_header_pkt_cb: NULL ptr  \n");
1318
        else
1319
                set_Monitoring_header_pkt_cb = monitoring_header_pkt_cb;
1320

    
1321
}
1322

    
1323
void mlRegisterGetRecvDataInf(get_recv_data_inf_cb recv_data_inf_cb){
1324

    
1325
        if (recv_data_inf_cb == NULL)
1326
                error("ML: Register get_recv_data_inf_cb: NULL ptr  \n");
1327
        else
1328
                get_Recv_data_inf_cb = recv_data_inf_cb;
1329

    
1330
}
1331

    
1332
void mlRegisterGetSendDataInf(get_send_data_inf_cb  send_data_inf_cb){
1333

    
1334
        if (send_data_inf_cb == NULL)
1335
                error("ML: Register get_send_data_inf_cb: NULL ptr  \n");
1336
        else
1337
                get_Send_data_inf_cb = send_data_inf_cb;
1338

    
1339
}
1340

    
1341
void mlRegisterSetMonitoringHeaderDataCb(set_monitoring_header_data_cb monitoring_header_data_cb){
1342

    
1343
        if (monitoring_header_data_cb == NULL)
1344
                error("ML: Register set_monitoring_header_data_cb : NULL ptr  \n");
1345
        else
1346
        set_Monitoring_header_data_cb = monitoring_header_data_cb;
1347

    
1348
}
1349

    
1350
void mlSetRecvTimeout(struct timeval timeout_value){
1351

    
1352
        recv_timeout = timeout_value;
1353

    
1354
}
1355

    
1356
int mlGetStandardTTL(socketID_handle socketID,uint8_t *ttl){
1357

    
1358
        return getTTL(socketfd, ttl);
1359

    
1360
}
1361

    
1362
socketID_handle mlGetLocalSocketID(int *errorstatus){
1363

    
1364
        if (NAT_traversal == false) {
1365
                *errorstatus = 2;
1366
                return NULL;
1367
        }
1368

    
1369
        *errorstatus = 0;
1370
        return &local_socketID;
1371

    
1372
}
1373

    
1374

    
1375
/**************************** END of MONL functions *************************/
1376

    
1377
/**************************** GENERAL functions *************************/
1378

    
1379
void mlRegisterRecvConnectionCb(receive_connection_cb recv_conn_cb){
1380

    
1381
        if (recv_conn_cb == NULL)
1382
                error("ML: Register receive_connection_cb: NULL ptr  \n");
1383
        else
1384
                receive_Connection_cb = recv_conn_cb;
1385

    
1386
}
1387

    
1388
void mlRegisterErrorConnectionCb(connection_failed_cb conn_failed){
1389

    
1390
        if (conn_failed == NULL)
1391
                error("ML: Register connection_failed_cb: NULL ptr  \n");
1392
        else
1393
        failed_Connection_cb = conn_failed;
1394

    
1395
}
1396

    
1397
void mlRegisterRecvDataCb(receive_data_cb data_cb,unsigned char msgtype){
1398

    
1399
    if (msgtype > 126) {
1400

    
1401
            error
1402
            ("ML: Could not register recv_data callback. Msgtype is greater then 126 \n");
1403

    
1404
    }
1405

    
1406
    if (data_cb == NULL) {
1407

    
1408
            error("ML: Register receive data callback: NUll ptr \n ");
1409

    
1410
    } else {
1411

    
1412
        recvcbbuf[msgtype] = data_cb;
1413

    
1414
    }
1415

    
1416
}
1417

    
1418
void mlCloseSocket(socketID_handle socketID){
1419

    
1420
        free(socketID);
1421

    
1422
}
1423

    
1424
void keepalive_fn(evutil_socket_t fd, short what, void *arg) {
1425
        socketID_handle peer = arg;
1426

    
1427
        int con_id = mlConnectionExist(peer, false);
1428
        if (con_id < 0 || connectbuf[con_id]->defaultSendParams.keepalive <= 0) {
1429
                /* Connection fell from under us or keepalive was disabled */
1430
                free(arg);
1431
                return;
1432
        }
1433

    
1434
        /* do what we gotta do */
1435
        if ( connectbuf[con_id]->status == READY) {
1436
                char keepaliveMsg[32] = "";
1437
                sprintf(keepaliveMsg, "KEEPALIVE %d", connectbuf[con_id]->keepalive_seq++);
1438
                send_msg(con_id, MSG_TYPE_ML_KEEPALIVE, keepaliveMsg, 1 + strlen(keepaliveMsg), false, 
1439
                        &(connectbuf[con_id]->defaultSendParams));
1440
        }
1441

    
1442
        /* re-schedule */
1443
        struct timeval t = { 0,0 };
1444
        t.tv_sec = connectbuf[con_id]->defaultSendParams.keepalive;
1445
        if (connectbuf[con_id]->defaultSendParams.keepalive) 
1446
                event_base_once(base, -1, EV_TIMEOUT, keepalive_fn, peer, &t);
1447
}
1448

    
1449
void setupKeepalive(int conn_id) {
1450
        /* Save the peer's address for us */
1451
        socketID_handle peer = malloc(sizeof(socket_ID));
1452
        memcpy(peer, &connectbuf[conn_id]->external_socketID, sizeof(socket_ID));
1453

    
1454
        struct timeval t = { 0,0 };
1455
        t.tv_sec = connectbuf[conn_id]->defaultSendParams.keepalive;
1456

    
1457
        if (connectbuf[conn_id]->defaultSendParams.keepalive) 
1458
                event_base_once(base, -1, EV_TIMEOUT, keepalive_fn, peer, &t);
1459
}
1460

    
1461
/* connection functions */
1462
int mlOpenConnection(socketID_handle external_socketID,receive_connection_cb connection_cb,void *arg, const send_params defaultSendParams){
1463

    
1464
        int con_id;
1465
        if (external_socketID == NULL) {
1466
                error("ML: cannot open connection: one of the socketIDs is NULL\n");
1467
                return -1;
1468
        }
1469
        if (NAT_traversal == false) {
1470
                error("ML: cannot open connection: NAT traversal for socketID still in progress\n");
1471
                return -1;
1472
        }
1473
        if (connection_cb == NULL) {
1474
                error("ML: cannot open connection: connection_cb is NULL\n");
1475
                return -1;
1476
        }
1477

    
1478
        // check if that connection already exist
1479

    
1480
        con_id = mlConnectionExist(external_socketID, false);
1481
        if (con_id >= 0) {
1482
                // overwrite defaultSendParams
1483
                bool newKeepalive = 
1484
                        connectbuf[con_id]->defaultSendParams.keepalive == 0 && defaultSendParams.keepalive != 0;
1485
                connectbuf[con_id]->defaultSendParams = defaultSendParams;
1486
                if (newKeepalive) setupKeepalive(con_id);
1487
                // if so check if it is ready to use
1488
                if (connectbuf[con_id]->status == READY) {
1489
                                // if so use the callback immediately
1490
                                (connection_cb) (con_id, arg);
1491

    
1492
                // otherwise just write the connection cb and the arg pointer
1493
                // into the connection struct
1494
                } else {
1495
                        struct receive_connection_cb_list *temp;
1496
                        temp = malloc(sizeof(struct receive_connection_cb_list));
1497
                        temp->next = NULL;
1498
                        temp->connection_cb = connection_cb;
1499
                        temp->arg = arg;
1500
                        if(connectbuf[con_id]->connection_last != NULL) {
1501
                                connectbuf[con_id]->connection_last->next = temp;
1502
                                connectbuf[con_id]->connection_last = temp;
1503
                        } else
1504
                                connectbuf[con_id]->connection_last = connectbuf[con_id]->connection_head = temp;
1505
                }
1506
                return con_id;
1507
        }
1508
        // make entry in connection_establishment array
1509
        for (con_id = 0; con_id < CONNECTBUFSIZE; con_id++) {
1510
                if (connectbuf[con_id] == NULL) {
1511
                        connectbuf[con_id] = (connect_data *) malloc(sizeof(connect_data));
1512
                        memset(connectbuf[con_id],0,sizeof(connect_data));
1513
                        connectbuf[con_id]->starttime = time(NULL);
1514
                        memcpy(&connectbuf[con_id]->external_socketID, external_socketID, sizeof(socket_ID));
1515
                        connectbuf[con_id]->pmtusize = DSLSLIM;
1516
                        connectbuf[con_id]->timeout_event = NULL;
1517
                        connectbuf[con_id]->status = INVITE;
1518
                        connectbuf[con_id]->seqnr = 0;
1519
                        connectbuf[con_id]->internal_connect = !compare_external_address_socketIDs(external_socketID, &local_socketID);
1520
                        connectbuf[con_id]->connectionID = con_id;
1521

    
1522
                        connectbuf[con_id]->connection_head = connectbuf[con_id]->connection_last = malloc(sizeof(struct receive_connection_cb_list));
1523
                        connectbuf[con_id]->connection_last->next = NULL;
1524
                        connectbuf[con_id]->connection_last->connection_cb = connection_cb;
1525
                        connectbuf[con_id]->connection_last->arg = arg;
1526
                        connectbuf[con_id]->external_connectionID = -1;
1527

    
1528
                        connectbuf[con_id]->defaultSendParams = defaultSendParams;
1529
                        if (defaultSendParams.keepalive) setupKeepalive(con_id);
1530
                        break;
1531
                }
1532
        } //end of for
1533

    
1534
        if (con_id == CONNECTBUFSIZE) {
1535
                error("ML: Could not open connection: connection buffer full\n");
1536
                return -1;
1537
        }
1538

    
1539
        // create and send a connection message
1540
        info("ML:Sending INVITE to %s (lconn:%d)\n",conid_to_string(con_id), con_id);
1541
        send_conn_msg_with_pmtu_discovery(con_id, connectbuf[con_id]->pmtusize, INVITE);
1542

    
1543
        return con_id;
1544

    
1545
}
1546

    
1547
void mlCloseConnection(const int connectionID){
1548

    
1549
        // remove it from the connection array
1550
        if(connectbuf[connectionID]) {
1551
                if(connectbuf[connectionID]->ctrl_msg_buf) {
1552
                        free(connectbuf[connectionID]->ctrl_msg_buf);
1553
                }
1554
                // remove related events
1555
                if (connectbuf[connectionID]->timeout_event) {
1556
                        event_del(connectbuf[connectionID]->timeout_event);
1557
                        event_free(connectbuf[connectionID]->timeout_event);
1558
                        connectbuf[connectionID]->timeout_event = NULL;
1559
                }
1560
                free(connectbuf[connectionID]);
1561
                connectbuf[connectionID] = NULL;
1562
        }
1563

    
1564
}
1565

    
1566
void mlSendData(const int connectionID,char *sendbuf,int bufsize,unsigned char msgtype,send_params *sParams){
1567

    
1568
        if (connectionID < 0) {
1569
                error("ML: send data failed: connectionID does not exist\n");
1570
                return;
1571
        }
1572

    
1573
        if (connectbuf[connectionID] == NULL) {
1574
                error("ML: send data failed: connectionID does not exist\n");
1575
                return;
1576
        }
1577
        if (connectbuf[connectionID]->status != READY) {
1578
            error("ML: send data failed: connection is not active\n");
1579
            return;
1580
        }
1581

    
1582
        if (sParams == NULL) {
1583
                sParams = &(connectbuf[connectionID]->defaultSendParams);
1584
        }
1585

    
1586
        send_msg(connectionID, msgtype, sendbuf, bufsize, false, sParams);
1587

    
1588
}
1589

    
1590
/* transmit data functions  */
1591
int mlSendAllData(const int connectionID,send_all_data_container *container,int nr_entries,unsigned char msgtype,send_params *sParams){
1592

    
1593
    if (nr_entries < 1 || nr_entries > 5) {
1594

    
1595
        error
1596
            ("ML : sendALlData : nr_enties is not between 1 and 5 \n ");
1597
        return 0;
1598

    
1599
    } else {
1600

    
1601
        if (nr_entries == 1) {
1602

    
1603
                mlSendData(connectionID, container->buffer_1,
1604
                      container->length_1, msgtype, sParams);
1605

    
1606
            return 1;
1607

    
1608
        } else if (nr_entries == 2) {
1609

    
1610
            int buflen = container->length_1 + container->length_2;
1611
            char buf[buflen];
1612
            memcpy(buf, container->buffer_1, container->length_1);
1613
            memcpy(&buf[container->length_1], container->buffer_2,
1614
                   container->length_2);
1615
            mlSendData(connectionID, buf, buflen, msgtype, sParams);
1616

    
1617
            return 1;
1618

    
1619
        } else if (nr_entries == 3) {
1620

    
1621
            int buflen =
1622
                container->length_1 + container->length_2 +
1623
                container->length_3;
1624
            char buf[buflen];
1625
            memcpy(buf, container->buffer_1, container->length_1);
1626
            memcpy(&buf[container->length_1], container->buffer_2,
1627
                   container->length_2);
1628
            memcpy(&buf[container->length_2], container->buffer_3,
1629
                   container->length_3);
1630
            mlSendData(connectionID, buf, buflen, msgtype, sParams);
1631

    
1632

    
1633
            return 1;
1634

    
1635
        } else if (nr_entries == 4) {
1636

    
1637
            int buflen =
1638
                container->length_1 + container->length_2 +
1639
                container->length_3 + container->length_4;
1640
            char buf[buflen];
1641
            memcpy(buf, container->buffer_1, container->length_1);
1642
            memcpy(&buf[container->length_1], container->buffer_2,
1643
                   container->length_2);
1644
            memcpy(&buf[container->length_2], container->buffer_3,
1645
                   container->length_3);
1646
            memcpy(&buf[container->length_3], container->buffer_4,
1647
                   container->length_4);
1648
            mlSendData(connectionID, buf, buflen, msgtype, sParams);
1649

    
1650
            return 1;
1651

    
1652
        } else {
1653

    
1654
            int buflen =
1655
                container->length_1 + container->length_2 +
1656
                container->length_3 + container->length_4 +
1657
                container->length_5;
1658
            char buf[buflen];
1659
            memcpy(buf, container->buffer_1, container->length_1);
1660
            memcpy(&buf[container->length_1], container->buffer_2,
1661
                   container->length_2);
1662
            memcpy(&buf[container->length_2], container->buffer_3,
1663
                   container->length_3);
1664
            memcpy(&buf[container->length_3], container->buffer_4,
1665
                   container->length_4);
1666
            memcpy(&buf[container->length_4], container->buffer_5,
1667
                   container->length_5);
1668
            mlSendData(connectionID, buf, buflen, msgtype, sParams);
1669

    
1670
            return 1;
1671
        }
1672

    
1673
    }
1674

    
1675
}
1676

    
1677
int mlRecvData(const int connectionID,char *recvbuf,int *bufsize,recv_params *rParams){
1678

    
1679
        //TODO yet to be converted
1680
        return 0;
1681
#if 0
1682
        if (rParams == NULL) {
1683
                error("ML: recv_data failed: recv_params is a NULL ptr\n");
1684
                return 0;
1685
    } else {
1686

1687
        info("ML: recv data called \n");
1688

1689
        int i = 0;
1690
        int returnValue = 0;
1691
        double timeout = (double) recv_timeout.tv_sec;
1692
        time_t endtime = time(NULL);
1693

1694
        for (i = 0; i < RECVDATABUFSIZE; i++) {
1695

1696
            if (recvdatabuf[i] != NULL) {
1697

1698
                if (recvdatabuf[i]->connectionID == connectionID) {
1699

1700
                    info("ML: recv data has entry  \n");
1701

1702
                    double timepass = difftime(endtime, recvdatabuf[i]->starttime);
1703

1704
                    // check if the specified connection has data and it
1705
                    // is complete
1706
                    // check the data seqnr
1707
                    // if(connectionID == recvdatabuf[i]->connectionID &&
1708
                    // 1 == recvdatabuf[i]->status){
1709

1710
                    if (1 == recvdatabuf[i]->status) {
1711

1712
                        // info("transmissionHandler: recv_data set is
1713
                        // complete \n" );
1714

1715
                        // debug("debud \n");
1716

1717
                        // exchange the pointers
1718
                        int buffersize = 0;
1719
                        buffersize = recvdatabuf[i]->bufsize;
1720
                        *bufsize = buffersize;
1721
                        // recvbuf = recvdatabuf[i]->recvbuf;
1722

1723
                        // info("buffersize %d \n",buffersize);
1724
                        memcpy(recvbuf, recvdatabuf[i]->recvbuf,
1725
                               buffersize);
1726
                        // debug(" recvbuf %s \n",recvbuf );
1727

1728
//                         double nrMissFrags =
1729
//                             (double) recvdatabuf[i]->nrFragments /
1730
//                             (double) recvdatabuf[i]->recvFragments;
1731
//                         int nrMissingFragments = (int) ceil(nrMissFrags);
1732

1733
//                        rParams->nrMissingFragments = nrMissingFragments;
1734
//                         rParams->nrFragments = recvdatabuf[i]->nrFragments;
1735
                        rParams->msgtype = recvdatabuf[i]->msgtype;
1736
                        rParams->connectionID =
1737
                            recvdatabuf[i]->connectionID;
1738

1739
                        // break from the loop
1740
                        // debug(" recvbuf %s \n ",recvbuf);
1741

1742
                        // double nrMissFrags =
1743
                        // (double)recvdatabuf[i]->nrFragments /
1744
                        // (double)recvdatabuf[i]->recvFragments;
1745
                        // int nrMissingFragments =
1746
                        // (int)ceil(nrMissFrags);
1747

1748
                        if(get_Recv_data_inf_cb != NULL) {
1749
                                mon_data_inf recv_data_inf;
1750

1751
                                recv_data_inf.remote_socketID = &(connectbuf[connectionID]->external_socketID);
1752
                                recv_data_inf.buffer = recvdatabuf[i]->recvbuf;
1753
                                recv_data_inf.bufSize = recvdatabuf[i]->bufsize;
1754
                                recv_data_inf.msgtype = recvdatabuf[i]->msgtype;
1755
//                                 recv_data_inf.monitoringHeaderType = recvdatabuf[i]->monitoringHeaderType;
1756
//                                 recv_data_inf.monitoringDataHeader = recvdatabuf[i]->monitoringDataHeader;
1757
                                gettimeofday(&recv_data_inf.arrival_time, NULL);
1758
                                recv_data_inf.firstPacketArrived = recvdatabuf[i]->firstPacketArrived;
1759
                                recv_data_inf.nrMissingFragments = nrMissingFragments;
1760
                                recv_data_inf.nrFragments = recvdatabuf[i]->nrFragments;
1761
                                recv_data_inf.priority = false;
1762
                                recv_data_inf.padding = false;
1763
                                recv_data_inf.confirmation = false;
1764
                                recv_data_inf.reliable = false;
1765

1766
                                // send data recv callback to monitoring module
1767

1768
                                (get_Recv_data_inf_cb) ((void *) &recv_data_inf);
1769
                        }
1770

1771

1772
                        // free the allocated memory
1773
                        free(recvdatabuf[i]);
1774
                        recvdatabuf[i] = NULL;
1775

1776
                        returnValue = 1;
1777
                        break;
1778

1779
                    }
1780

1781
                    if (recvdatabuf[i] != NULL) {
1782

1783
                        if (timepass > timeout) {
1784

1785
                            info("ML: recv_data timeout called  \n");
1786

1787
                            // some data about the missing chunks should
1788
                            // be added here
1789
                            // exchange the pointers
1790
                            int buffersize = 0;
1791
                            buffersize = recvdatabuf[i]->bufsize;
1792
                            *bufsize = buffersize;
1793
                            // recvbuf = recvdatabuf[i]->recvbuf;
1794

1795
                            double nrMissFrags =
1796
                                (double) recvdatabuf[i]->nrFragments /
1797
                                (double) recvdatabuf[i]->recvFragments;
1798
                            int nrMissingFragments =
1799
                                (int) ceil(nrMissFrags);
1800

1801
                            // debug(" recvbuf %s \n",recvbuf );
1802

1803
                            memcpy(recvbuf, recvdatabuf[i]->recvbuf,
1804
                                   buffersize);
1805

1806
                            rParams->nrMissingFragments =
1807
                                nrMissingFragments;
1808
                            rParams->nrFragments =
1809
                                recvdatabuf[i]->nrFragments;
1810
                            rParams->msgtype = recvdatabuf[i]->msgtype;
1811
                            rParams->connectionID =
1812
                                recvdatabuf[i]->connectionID;
1813

1814
                                if(get_Recv_data_inf_cb != NULL) {
1815
                                        mon_data_inf recv_data_inf;
1816

1817
                                        recv_data_inf.remote_socketID = &(connectbuf[connectionID]->external_socketID);
1818
                                        recv_data_inf.buffer = recvdatabuf[i]->recvbuf;
1819
                                        recv_data_inf.bufSize = recvdatabuf[i]->bufsize;
1820
                                        recv_data_inf.msgtype = recvdatabuf[i]->msgtype;
1821
                                        recv_data_inf.monitoringHeaderType = recvdatabuf[i]->monitoringHeaderType;
1822
                                        recv_data_inf.monitoringDataHeader = recvdatabuf[i]->monitoringDataHeader;
1823
                                        gettimeofday(&recv_data_inf.arrival_time, NULL);
1824
                                        recv_data_inf.firstPacketArrived = recvdatabuf[i]->firstPacketArrived;
1825
                                        recv_data_inf.nrMissingFragments = nrMissingFragments;
1826
                                        recv_data_inf.nrFragments = recvdatabuf[i]->nrFragments;
1827
                                        recv_data_inf.priority = false;
1828
                                        recv_data_inf.padding = false;
1829
                                        recv_data_inf.confirmation = false;
1830
                                        recv_data_inf.reliable = false;
1831

1832
                                        // send data recv callback to monitoring module
1833

1834
                                        (get_Recv_data_inf_cb) ((void *) &recv_data_inf);
1835
                                }
1836

1837
                            // free the allocated memory
1838
                            free(recvdatabuf[i]);
1839
                            recvdatabuf[i] = NULL;
1840

1841
                            returnValue = 1;
1842
                            break;
1843

1844
                        }
1845
                    }
1846

1847
                }
1848

1849
            }
1850
            // debug("2 recvbuf %s \n ",recvbuf);
1851
        }
1852
        return returnValue;
1853
    }
1854
#endif
1855

    
1856
}
1857

    
1858
int mlSocketIDToString(socketID_handle socketID,char* socketID_string, size_t len){
1859

    
1860
        char internal_addr[INET_ADDRSTRLEN];
1861
        char external_addr[INET_ADDRSTRLEN];
1862
        inet_ntop(AF_INET, &(socketID->internal_addr.udpaddr.sin_addr.s_addr), internal_addr, INET_ADDRSTRLEN);
1863
        inet_ntop(AF_INET, &(socketID->external_addr.udpaddr.sin_addr.s_addr), external_addr, INET_ADDRSTRLEN);
1864

    
1865
        snprintf(socketID_string,len,"%s:%d-%s:%d", internal_addr, ntohs(socketID->internal_addr.udpaddr.sin_port),
1866
                external_addr,        ntohs(socketID->external_addr.udpaddr.sin_port));
1867
        return 0;
1868

    
1869
}
1870

    
1871
int mlStringToSocketID(const char* socketID_string, socketID_handle socketID){
1872

    
1873
        //@TODO add checks against malformed string
1874
        char external_addr[INET_ADDRSTRLEN];
1875
        int external_port;
1876
        char internal_addr[INET_ADDRSTRLEN];
1877
        int internal_port;
1878

    
1879
        char *pch;
1880
        char *s = strdup(socketID_string);
1881

    
1882
        //replace ':' with a blank
1883
        pch=strchr(s,':');
1884
        while (pch!=NULL){
1885
                                *pch = ' ';
1886
                pch=strchr(pch+1,':');
1887
        }
1888
        pch=strchr(s,'-');
1889
        if(pch) *pch = ' ';
1890

    
1891
        sscanf(s,"%s %d %s %d", internal_addr, &internal_port,
1892
                external_addr, &external_port);
1893

    
1894
        //set structure to 0, we initialize each byte, since it will be sent on the net later
1895
        memset(socketID, 0, sizeof(struct _socket_ID));
1896

    
1897
        if(inet_pton(AF_INET, internal_addr, &(socketID->internal_addr.udpaddr.sin_addr)) == 0)
1898
                return EINVAL;
1899
        socketID->internal_addr.udpaddr.sin_family = AF_INET;
1900
        socketID->internal_addr.udpaddr.sin_port = htons(internal_port);
1901

    
1902

    
1903
        if(inet_pton(AF_INET, external_addr, &(socketID->external_addr.udpaddr.sin_addr)) ==0)
1904
                return EINVAL;
1905
        socketID->external_addr.udpaddr.sin_family = AF_INET;
1906
        socketID->external_addr.udpaddr.sin_port = htons(external_port);
1907

    
1908
        free(s);
1909
        return 0;
1910

    
1911
}
1912

    
1913
int mlGetConnectionStatus(int connectionID){
1914

    
1915
        if(connectbuf[connectionID])
1916
                return connectbuf[connectionID]->status == READY;
1917
        return -1;
1918
    
1919
}
1920

    
1921

    
1922
int mlConnectionExist(socketID_handle socketID, bool ready){
1923

    
1924
    /*
1925
     * check if another connection for the external connectionID exist
1926
     * that was established \ within the last 2 seconds
1927
     */
1928
        int i;
1929
        for (i = 0; i < CONNECTBUFSIZE; i++)
1930
                if (connectbuf[i] != NULL)
1931
                        if (mlCompareSocketIDs(&(connectbuf[i]->external_socketID), socketID) == 0) {
1932
                                if (ready) return (connectbuf[i]->status == READY ? i : -1);;
1933
                                return i;
1934
                                }
1935

    
1936
    return -1;
1937

    
1938
}
1939

    
1940
//Added by Robert Birke as comodity functions
1941

    
1942
//int mlPrintSocketID(socketID_handle socketID) {
1943
//        char str[SOCKETID_STRING_SIZE];
1944
//        mlSocketIDToString(socketID, str, sizeof(str));
1945
//        printf(stderr,"int->%s<-ext\n",str);
1946
//}
1947

    
1948
/*
1949
 * hash code of a socketID
1950
 * TODO might think of a better way
1951
 */
1952
int mlHashSocketID(socketID_handle sock) {
1953
    return sock->internal_addr.udpaddr.sin_port +
1954
                          sock->external_addr.udpaddr.sin_port;
1955
}
1956

    
1957
int mlCompareSocketIDs(socketID_handle sock1, socketID_handle sock2) {
1958
        /*
1959
        * compare internal addr
1960
        */
1961
        if(sock1 == NULL || sock2 == NULL)
1962
                return 1;
1963

    
1964
        if (sock1->internal_addr.udpaddr.sin_addr.s_addr !=
1965
            sock2->internal_addr.udpaddr.sin_addr.s_addr)
1966
                        return 1;
1967

    
1968
        if (sock1->internal_addr.udpaddr.sin_port !=
1969
                 sock2->internal_addr.udpaddr.sin_port)
1970
                        return 1;
1971

    
1972
        /*
1973
        * compare external addr
1974
        */
1975
        if (sock1->external_addr.udpaddr.sin_addr.s_addr !=
1976
            sock2->external_addr.udpaddr.sin_addr.s_addr)
1977
                        return 1;
1978

    
1979
        if (sock1->external_addr.udpaddr.sin_port !=
1980
                 sock2->external_addr.udpaddr.sin_port)
1981
                        return 1;
1982

    
1983
        return 0;
1984
}
1985

    
1986
int mlCompareSocketIDsByPort(socketID_handle sock1, socketID_handle sock2)
1987
{
1988
        if(sock1 == NULL || sock2 == NULL)
1989
                return 1;
1990
 
1991
        if (sock1->internal_addr.udpaddr.sin_port !=
1992
                 sock2->internal_addr.udpaddr.sin_port)
1993
                        return 1;
1994

    
1995
        if (sock1->external_addr.udpaddr.sin_port !=
1996
                 sock2->external_addr.udpaddr.sin_port)
1997
                        return 1;
1998
        return 0;
1999
}
2000

    
2001
int mlGetPathMTU(int ConnectionId) {
2002
        if(ConnectionId < 0 || ConnectionId >= CONNECTBUFSIZE)
2003
                return -1;
2004
        if (connectbuf[ConnectionId] != NULL)
2005
                return connectbuf[ConnectionId]->pmtusize;
2006
        return -1;
2007
}
2008

    
2009
/**************************** END of GENERAL functions *************************/
2010

    
2011
/**************************** NAT functions *************************/
2012

    
2013
/* setter  */
2014
void mlSetStunServer(const int port,const char *ipaddr){
2015

    
2016
        stun_server.sin_family = AF_INET;
2017
        if (ipaddr == NULL)
2018
                stun_server.sin_addr.s_addr = htonl(INADDR_NONE);
2019
        else
2020
                stun_server.sin_addr.s_addr = resolve(ipaddr);
2021
        stun_server.sin_port = htons(port);
2022

    
2023
}
2024

    
2025
int mlGetExternalIP(char* external_addr){
2026

    
2027
        socketaddrgen udpgen;
2028
        struct sockaddr_in udpaddr;
2029

    
2030
        udpgen = local_socketID.external_addr;
2031
        udpaddr = udpgen.udpaddr;
2032

    
2033
        inet_ntop(AF_INET, &(udpaddr.sin_addr), external_addr,
2034
                        INET_ADDRSTRLEN);
2035

    
2036
        if (external_addr == NULL) {
2037

    
2038
        return -1;
2039

    
2040
        } else {
2041

    
2042
        return 0;
2043

    
2044
        }
2045

    
2046
}
2047

    
2048
/**************************** END of NAT functions *************************/