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1
/*
2
 *          Policy Management
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 *
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 *          NEC Europe Ltd. PROPRIETARY INFORMATION
5
 *
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 * This software is supplied under the terms of a license agreement
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 * or nondisclosure agreement with NEC Europe Ltd. and may not be
8
 * copied or disclosed except in accordance with the terms of that
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 * agreement.
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 *
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 *      Copyright (c) 2009 NEC Europe Ltd. All Rights Reserved.
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 *
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 * Authors: Kristian Beckers  <beckers@nw.neclab.eu>
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 *          Sebastian Kiesel  <kiesel@nw.neclab.eu>
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 *          
16
 *
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 * NEC Europe Ltd. DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED,
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 * INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY
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 * AND FITNESS FOR A PARTICULAR PURPOSE AND THE WARRANTY AGAINST LATENT
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 * DEFECTS, WITH RESPECT TO THE PROGRAM AND THE ACCOMPANYING
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 * DOCUMENTATION.
22
 *
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 * No Liability For Consequential Damages IN NO EVENT SHALL NEC Europe
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 * Ltd., NEC Corporation OR ANY OF ITS SUBSIDIARIES BE LIABLE FOR ANY
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 * DAMAGES WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS
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.
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 *
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 *     THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
33
 */
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35
#include <arpa/inet.h>
36
#include <netinet/in.h>
37
#include <sys/socket.h>
38
#include <fcntl.h>
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#include <event2/event.h>
40
#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <sys/types.h>
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#include <arpa/inet.h>
48
#include <netdb.h>
49
#include <errno.h>
50
#include <time.h>
51
#include <math.h>
52
#include "msg_types.h"
53
#include "util/udpSocket.h"
54
#include "util/stun.h"
55
#include "transmissionHandler.h"
56

    
57
#define LOG_MODULE "[ml] "
58
#include "ml_log.h"
59

    
60
/**************************** START OF INTERNALS ***********************/
61

    
62
/*
63
 * a pointer to a libevent instance
64
 */
65
struct event_base *base;
66

    
67
/*
68
 * define the nr of connections the messaging layer can handle
69
 */
70
#define CONNECTBUFSIZE 10000
71
/*
72
 * define the nr of data that can be received parallel
73
 */
74
#define RECVDATABUFSIZE 10000
75
/*
76
 * define an array for message multiplexing
77
 */
78
#define MSGMULTIPLEXSIZE 127
79

    
80
/*
81
 * global variables
82
 */
83
/*
84
 * define a buffer of pointers to connect structures
85
 */
86
connect_data *connectbuf[CONNECTBUFSIZE];
87

    
88
/*
89
 * define a pointer buffer with pointers to recv_data structures
90
 */
91
recvdata *recvdatabuf[RECVDATABUFSIZE];
92

    
93
/*
94
 * define a pointer buffer for message multiplexing
95
 */
96
receive_data_cb recvcbbuf[MSGMULTIPLEXSIZE];
97

    
98
/*
99
 * stun server address
100
 */
101
struct sockaddr_in stun_server;
102

    
103
/*
104
 * receive timeout
105
 */
106
struct timeval recv_timeout;
107

    
108
/*
109
 * boolean NAT traversal successful if true
110
 */
111
boolean NAT_traversal;
112

    
113
/*
114
 * file descriptor for local socket
115
 */
116
evutil_socket_t socketfd;
117

    
118
/*
119
 * local socketID
120
 */
121
socket_ID local_socketID;
122

    
123
socketID_handle loc_socketID = &local_socketID;
124

    
125
/*
126
 * callback function pointers
127
 */
128
/*
129
 * monitoring module callbacks
130
 */
131
get_recv_pkt_inf_cb get_Recv_pkt_inf_cb = NULL;
132
get_send_pkt_inf_cb get_Send_pkt_inf_cb = NULL;
133
set_monitoring_header_pkt_cb set_Monitoring_header_pkt_cb = NULL;
134
get_recv_data_inf_cb get_Recv_data_inf_cb = NULL;
135
get_send_data_inf_cb get_Send_data_inf_cb = NULL;
136
set_monitoring_header_data_cb set_Monitoring_header_data_cb = NULL;
137
/*
138
 * connection callbacks
139
 */
140
receive_connection_cb receive_Connection_cb = NULL;
141
connection_failed_cb failed_Connection_cb = NULL;
142
/*
143
 * local socketID callback
144
 */
145
receive_localsocketID_cb receive_SocketID_cb;
146

    
147
/*
148
 * boolean that defines if received data is transmitted to the upper layer
149
 * via callback or via upper layer polling
150
 */
151
boolean recv_data_callback;
152

    
153
/*
154
 * helper function to get rid of a warning
155
 */
156
int min(int a, int b) {
157
        if (a > b) return b;
158
        return a;
159
}
160

    
161
void register_recv_localsocketID_cb(receive_localsocketID_cb local_socketID_cb)
162
{
163
        if (local_socketID_cb == NULL)
164
                error("ML : Register receive_localsocketID_cb: NULL ptr \n");
165
        else
166
        receive_SocketID_cb = local_socketID_cb;
167
}
168

    
169

    
170
//void keep_connection_alive(const int connectionID)
171
//{
172
//
173
//    // to be done with the NAT traversal
174
//    // send a message over the wire
175
//    printf("\n");
176
//
177
//}
178

    
179
void unsetStunServer()
180
{
181
        stun_server.sin_addr.s_addr = 0;
182
}
183

    
184
bool isStunDefined()
185
{
186
        return stun_server.sin_addr.s_addr;
187
}
188

    
189
void send_msg(int con_id, int msg_type, char* msg, int msg_len, bool truncable, send_params * sParams) {
190
        socketaddrgen udpgen;
191
        bool retry;
192
        int pkt_len, offset;
193
        struct iovec iov[4];
194

    
195
        char h_pkt[MON_HEADER_SPACE];
196
        char h_data[MON_HEADER_SPACE];
197

    
198
        struct msg_header msg_h;
199

    
200
        iov[0].iov_base = &msg_h;
201
        iov[0].iov_len = MSG_HEADER_SIZE;
202

    
203
        msg_h.local_con_id = con_id;
204
        msg_h.remote_con_id = connectbuf[con_id]->external_connectionID;
205
        msg_h.msg_type = msg_type;
206
        msg_h.msg_seq_num = connectbuf[con_id]->seqnr++;
207

    
208

    
209
        iov[1].iov_len = iov[2].iov_len = 0;
210
        iov[1].iov_base = h_pkt;
211
        iov[2].iov_base = h_data;
212

    
213

    
214
        if (connectbuf[con_id]->internal_connect)
215
                udpgen = connectbuf[con_id]->external_socketID.internal_addr;
216
        else
217
                udpgen = connectbuf[con_id]->external_socketID.external_addr;
218

    
219
        do{
220
                offset = 0;
221
                retry = false;
222
                // Monitoring layer hook
223
                if(set_Monitoring_header_data_cb != NULL) {
224
                        iov[2].iov_len = ((set_Monitoring_header_data_cb) (&(connectbuf[con_id]->external_socketID), msg_type));
225
                }
226
                msg_h.len_mon_data_hdr = iov[2].iov_len;
227

    
228
                if(get_Send_data_inf_cb != NULL && iov[2].iov_len != 0) {
229
                        mon_data_inf sd_data_inf;
230

    
231
                        sd_data_inf.remote_socketID = &(connectbuf[con_id]->external_socketID);
232
                        sd_data_inf.buffer = msg;
233
                        sd_data_inf.bufSize = msg_len;
234
                        sd_data_inf.msgtype = msg_type;
235
                        sd_data_inf.monitoringDataHeader = iov[2].iov_base;
236
                        sd_data_inf.monitoringDataHeaderLen = iov[2].iov_len;
237
                        sd_data_inf.priority = sParams->priority;
238
                        sd_data_inf.padding = sParams->padding;
239
                        sd_data_inf.confirmation = sParams->confirmation;
240
                        sd_data_inf.reliable = sParams->reliable;
241
                        memset(&sd_data_inf.arrival_time, 0, sizeof(struct timeval));
242

    
243
                        (get_Send_data_inf_cb) ((void *) &sd_data_inf);
244
                }
245

    
246
                do {
247
                        if(set_Monitoring_header_pkt_cb != NULL) {
248
                                iov[1].iov_len = (set_Monitoring_header_pkt_cb) (&(connectbuf[con_id]->external_socketID), msg_type);
249
                        }
250
                        pkt_len = min(connectbuf[con_id]->pmtusize - iov[2].iov_len - iov[1].iov_len - iov[0].iov_len, msg_len - offset) ;
251

    
252
                        iov[3].iov_len = pkt_len;
253
                        iov[3].iov_base = msg + offset;
254

    
255
                        //fill header
256
                        msg_h.len_mon_packet_hdr = iov[1].iov_len;
257
                        msg_h.offset = offset;
258
                        msg_h.msg_length = truncable ? pkt_len : msg_len;
259

    
260
                        //monitoring layer hook
261
                        if(get_Send_pkt_inf_cb != NULL && iov[1].iov_len) {
262
                                mon_pkt_inf pkt_info;
263

    
264
                                pkt_info.remote_socketID = &(connectbuf[con_id]->external_socketID);
265
                                pkt_info.buffer = msg + offset;
266
                                pkt_info.bufSize = pkt_len;
267
                                pkt_info.msgtype = msg_type;
268
                                pkt_info.dataID = connectbuf[con_id]->seqnr;
269
                                pkt_info.offset = offset;
270
                                pkt_info.datasize = msg_len;
271
                                pkt_info.monitoringHeaderLen = iov[1].iov_len;
272
                                pkt_info.monitoringHeader = iov[1].iov_base;
273
                                pkt_info.ttl = -1;
274
                                memset(&(pkt_info.arrival_time),0,sizeof(struct timeval));
275

    
276
                                (get_Send_pkt_inf_cb) ((void *) &pkt_info);
277
                        }
278

    
279

    
280
                        switch(sendPacket(socketfd, iov, 4, &udpgen.udpaddr)) {
281
                                case MSGLEN:
282
                                        connectbuf[con_id]->pmtusize = pmtu_decrement(connectbuf[con_id]->pmtusize);
283
                                        connectbuf[con_id]->delay = true;
284
                                        retry = true;
285
                                        offset = msg_len; // exit the while
286
                                        break;
287
                                case FAILURE:
288
                                        offset = msg_len; // exit the while
289
                                        break;
290
                                case OK:
291
                                        //update
292
                                        offset += pkt_len + iov[2].iov_len;
293
                                        //transmit data header only in the first packet
294
                                        iov[2].iov_len = 0;
295
                                        break;
296
                        }
297
                } while(offset != msg_len + msg_h.len_mon_data_hdr && !truncable);
298
        } while(retry);
299
}
300

    
301
void send_conn_msg(int con_id, int buf_size, int command_type)
302
{
303
        if (buf_size < sizeof(struct conn_msg)) {
304
                error("ML: requested connection message size is too small\n");
305
                return;
306
        }
307

    
308
        if(connectbuf[con_id]->ctrl_msg_buf == NULL) {
309
                connectbuf[con_id]->ctrl_msg_buf = malloc(buf_size);
310
                memset(connectbuf[con_id]->ctrl_msg_buf, 0, buf_size);
311
        }
312

    
313
        if(connectbuf[con_id]->ctrl_msg_buf == NULL) {
314
                error("ML: can not allocate memory for connection message\n");
315
                return;
316
        }
317

    
318
        struct conn_msg *msg_header = (struct conn_msg*) connectbuf[con_id]->ctrl_msg_buf;
319

    
320
        msg_header->comand_type = command_type;
321
        msg_header->pmtu_size = connectbuf[con_id]->pmtusize;
322

    
323
        memcpy(&(msg_header->sock_id), loc_socketID, sizeof(socket_ID));
324

    
325
        send_msg(con_id, ML_CON_MSG, connectbuf[con_id]->ctrl_msg_buf, buf_size, true, &(connectbuf[con_id]->defaultSendParams));
326
}
327

    
328
void
329
recv_conn_msg(struct msg_header *msg_h, char *msgbuf, int bufsize)
330
{
331
        struct conn_msg *con_msg;
332
        int free_con_id, con_id;
333

    
334
        time_t now = time(NULL);
335
        double timediff = 0.0;
336

    
337
        // Monitoring layer hook
338
        if(get_Recv_data_inf_cb != NULL && msg_h->len_mon_data_hdr != 0) {
339
                // update pointer to the real data
340
                msgbuf += msg_h->len_mon_data_hdr;
341
                bufsize -= msg_h->len_mon_data_hdr;
342
                con_msg = (struct conn_msg *)msgbuf;
343

    
344
                mon_data_inf recv_data_inf;
345
                recv_data_inf.remote_socketID = &(con_msg->sock_id);
346
                recv_data_inf.buffer = msgbuf;
347
                recv_data_inf.bufSize = bufsize;
348
                recv_data_inf.msgtype = msg_h->msg_type;
349
                recv_data_inf.monitoringDataHeaderLen = msg_h->len_mon_data_hdr;
350
                recv_data_inf.monitoringDataHeader = msg_h->len_mon_data_hdr ? msgbuf : NULL;
351
                gettimeofday(&recv_data_inf.arrival_time, NULL);
352
                recv_data_inf.firstPacketArrived = true;
353
                recv_data_inf.recvFragments = 1;
354
                recv_data_inf.priority = false;
355
                recv_data_inf.padding = false;
356
                recv_data_inf.confirmation = false;
357
                recv_data_inf.reliable = false;
358

    
359
                // send data recv callback to monitoring module
360
                (get_Recv_data_inf_cb) ((void *) &recv_data_inf);
361
        } else
362
                con_msg = (struct conn_msg *) msgbuf;
363

    
364
        // check the connection command type
365
        switch (con_msg->comand_type) {
366
                /*
367
                * if INVITE: enter a new socket make new entry in connect array
368
                * send an ok
369
                */
370
                case INVITE:
371
                        debug("ML: received INVITE\n");
372
                        /*
373
                        * check if another connection for the external connectionID exist
374
                        * that was established within the last 2 seconds
375
                        */
376
                        free_con_id = -1;
377
                        for (con_id = 0; con_id < CONNECTBUFSIZE; con_id++) {
378
                                if (connectbuf[con_id] != NULL) {
379
                                        if (mlCompareSocketIDs(&(connectbuf[con_id]->external_socketID), &(con_msg->sock_id)) == 0) {
380
                                                timediff = difftime(now, connectbuf[con_id]->starttime);
381
                                                if (timediff < 2)
382
                                                        break;
383
                                        }
384
                                } else if(free_con_id == -1)
385
                                        free_con_id = con_id;
386
                        }
387

    
388
                        if (con_id == CONNECTBUFSIZE) {
389
                                // create an entry in the connecttrybuf
390
                                if(free_con_id == -1) {
391
                                        error("ML: no new connect_buf available\n");
392
                                        return;
393
                                }
394
                                connectbuf[free_con_id] = (connect_data *) malloc(sizeof(connect_data));
395
                                memset(connectbuf[free_con_id],0,sizeof(connect_data));
396
                                connectbuf[free_con_id]->connection_head = connectbuf[free_con_id]->connection_last = NULL;
397
                                connectbuf[free_con_id]->starttime = time(NULL);
398
                                memcpy(&(connectbuf[free_con_id]->external_socketID), &(con_msg->sock_id), sizeof(socket_ID));
399
                                connectbuf[free_con_id]->pmtusize = con_msg->pmtu_size;
400
                                connectbuf[free_con_id]->external_connectionID = msg_h->local_con_id;
401
                                connectbuf[free_con_id]->internal_connect =
402
                                        !compare_external_address_socketIDs(&(con_msg->sock_id), loc_socketID);
403
                                con_id = free_con_id;
404
                        }
405

    
406
                        if(connectbuf[con_id]->status <= CONNECT) {
407
                                //update status and send back answer
408
                                connectbuf[con_id]->status = CONNECT;
409
                                send_conn_msg(con_id, con_msg->pmtu_size, CONNECT);
410
                        }
411
                        break;
412
                case CONNECT:
413
                        debug("ML: received CONNECT\n");
414

    
415
                        if(msg_h->remote_con_id != -1 && connectbuf[msg_h->remote_con_id] == NULL) {
416
                                error("ML: received CONNECT for inexistent connection\n");
417
                                return;
418
                        }
419

    
420
                        /*
421
                        * check if the connection status is not already 1 or 2
422
                        */
423
                        if (connectbuf[msg_h->remote_con_id]->status == INVITE) {
424
                                // set the external connectionID
425
                                connectbuf[msg_h->remote_con_id]->external_connectionID = msg_h->local_con_id;
426
                                // change status con_msg the connection_data
427
                                connectbuf[msg_h->remote_con_id]->status = READY;
428
                                // change pmtusize in the connection_data
429
                                connectbuf[msg_h->remote_con_id]->pmtusize = con_msg->pmtu_size;
430

    
431
                                // send the READY
432
                                send_conn_msg(msg_h->remote_con_id, con_msg->pmtu_size, READY);
433

    
434
                                if (receive_Connection_cb != NULL)
435
                                        (receive_Connection_cb) (msg_h->remote_con_id, NULL);
436

    
437
                                // call all registered callbacks
438
                                while(connectbuf[msg_h->remote_con_id]->connection_head != NULL) {
439
                                        struct receive_connection_cb_list *temp;
440
                                        temp = connectbuf[msg_h->remote_con_id]->connection_head;
441
                                        (temp->connection_cb) (msg_h->remote_con_id, temp->arg);
442
                                        connectbuf[msg_h->remote_con_id]->connection_head = temp->next;
443
                                        free(temp);
444
                                }
445
                                connectbuf[msg_h->remote_con_id]->connection_head =
446
                                        connectbuf[msg_h->remote_con_id]->connection_last = NULL;
447
                        } else
448
                                // send the READY
449
                                send_conn_msg(msg_h->remote_con_id, con_msg->pmtu_size, READY);
450

    
451
                        debug("ML: active connection established\n");
452
                        break;
453

    
454
                        /*
455
                        * if READY: find the entry in the connection array set the
456
                        * connection active change the pmtu size
457
                        */
458
                case READY:
459
                        debug("ML: received READY\n");
460
                        if(connectbuf[msg_h->remote_con_id] == NULL) {
461
                                error("ML: received READY for inexistent connection\n");
462
                                return;
463
                        }
464
                        /*
465
                        * checks if the connection is not already established
466
                        */
467
                        if (connectbuf[msg_h->remote_con_id]->status == CONNECT) {
468
                                // change status of the connection
469
                                connectbuf[msg_h->remote_con_id]->status = 2;
470
                                // change pmtusize
471
                                connectbuf[msg_h->remote_con_id]->pmtusize = con_msg->pmtu_size;
472

    
473
                                if (receive_Connection_cb != NULL)
474
                                        (receive_Connection_cb) (msg_h->remote_con_id, NULL);
475

    
476
                                while(connectbuf[msg_h->remote_con_id]->connection_head != NULL) {
477
                                        struct receive_connection_cb_list *temp;
478
                                        temp = connectbuf[msg_h->remote_con_id]->connection_head;
479
                                        (temp->connection_cb) (msg_h->remote_con_id, temp->arg);
480
                                        connectbuf[msg_h->remote_con_id]->connection_head = temp->next;
481
                                        free(temp);
482
                                }
483
                                connectbuf[msg_h->remote_con_id]->connection_head =
484
                                        connectbuf[msg_h->remote_con_id]->connection_last = NULL;
485
                                debug("ML: passive connection established\n");
486
                        }
487
                        break;
488
        }
489
}
490

    
491
void recv_stun_msg(char *msgbuf, int recvSize)
492
{
493
        /*
494
        * create empty stun message struct
495
        */
496
        StunMessage resp;
497
        memset(&resp, 0, sizeof(StunMessage));
498
        /*
499
        * parse the message
500
        */
501
        int returnValue = 0;
502
        returnValue = recv_stun_message(msgbuf, recvSize, &resp);
503

    
504
        if (returnValue == 0) {
505
                /*
506
                * read the reflexive Address into the local_socketID
507
                */
508
                struct sockaddr_in reflexiveAddr;
509
                reflexiveAddr.sin_family = AF_INET;
510
                reflexiveAddr.sin_addr.s_addr = htonl(resp.mappedAddress.ipv4.addr);
511
                reflexiveAddr.sin_port = htons(resp.mappedAddress.ipv4.port);
512
                socketaddrgen reflexiveAddres;
513
                reflexiveAddres.udpaddr = reflexiveAddr;
514
                local_socketID.external_addr = reflexiveAddres;
515
                NAT_traversal = true;
516
                // callback to the upper layer indicating that the socketID is now
517
                // ready to use
518
                (receive_SocketID_cb) (&local_socketID, 0);
519
        }
520
}
521

    
522
//done
523
void recv_timeout_cb(int fd, short event, void *arg)
524
{
525
        int recv_id = (long) arg;
526
        debug("ML: recv_timeout_cb called\n");
527

    
528
        if (recvdatabuf[recv_id] == NULL) {
529
                return;
530
        }
531

    
532

    
533
        if(recvdatabuf[recv_id]->status == ACTIVE) {
534
                //TODO make timeout at least a DEFINE
535
                struct timeval timeout = { 4, 0 };
536
                recvdatabuf[recv_id]->status = INACTIVE;
537
                event_base_once(base, -1, EV_TIMEOUT, recv_timeout_cb,
538
                        arg, &timeout);
539
                return;
540
        }
541

    
542
        if(recvdatabuf[recv_id]->status == INACTIVE) {
543
                // Monitoring layer hook
544
                if(get_Recv_data_inf_cb != NULL) {
545
                        mon_data_inf recv_data_inf;
546

    
547
                        recv_data_inf.remote_socketID =
548
                                        &(connectbuf[recvdatabuf[recv_id]->connectionID]->external_socketID);
549
                        recv_data_inf.buffer = recvdatabuf[recv_id]->recvbuf;
550
                        recv_data_inf.bufSize = recvdatabuf[recv_id]->bufsize;
551
                        recv_data_inf.msgtype = recvdatabuf[recv_id]->msgtype;
552
                        recv_data_inf.monitoringDataHeaderLen = recvdatabuf[recv_id]->monitoringDataHeaderLen;
553
                        recv_data_inf.monitoringDataHeader = recvdatabuf[recv_id]->monitoringDataHeaderLen ?
554
                                recvdatabuf[recv_id]->recvbuf : NULL;
555
                        gettimeofday(&recv_data_inf.arrival_time, NULL);
556
                        recv_data_inf.firstPacketArrived = recvdatabuf[recv_id]->firstPacketArrived;
557
                        recv_data_inf.recvFragments = recvdatabuf[recv_id]->recvFragments;
558
                        recv_data_inf.priority = false;
559
                        recv_data_inf.padding = false;
560
                        recv_data_inf.confirmation = false;
561
                        recv_data_inf.reliable = false;
562

    
563
                        // send data recv callback to monitoring module
564

    
565
                        (get_Recv_data_inf_cb) ((void *) &recv_data_inf);
566
                }
567

    
568
                // Get the right callback
569
                receive_data_cb receive_data_callback = recvcbbuf[recvdatabuf[recv_id]->msgtype];
570

    
571
                recv_params rParams;
572

    
573
                rParams.nrMissingBytes = recvdatabuf[recv_id]->bufsize - recvdatabuf[recv_id]->arrivedBytes;
574
                rParams.recvFragments = recvdatabuf[recv_id]->recvFragments;
575
                rParams.msgtype = recvdatabuf[recv_id]->msgtype;
576
                rParams.connectionID = recvdatabuf[recv_id]->connectionID;
577
                rParams.remote_socketID =
578
                        &(connectbuf[recvdatabuf[recv_id]->connectionID]->external_socketID);
579
                rParams.firstPacketArrived = recvdatabuf[recv_id]->firstPacketArrived;
580

    
581
                (receive_data_callback) (recvdatabuf[recv_id]->recvbuf + recvdatabuf[recv_id]->monitoringDataHeaderLen, recvdatabuf[recv_id]->bufsize - recvdatabuf[recv_id]->monitoringDataHeaderLen,
582
                        recvdatabuf[recv_id]->msgtype, &rParams);
583

    
584
                //clean up
585
                free(recvdatabuf[recv_id]->recvbuf);
586
                free(recvdatabuf[recv_id]);
587
                recvdatabuf[recv_id] = NULL;
588
        }
589
}
590

    
591
// process a single recv data message
592
void recv_data_msg(struct msg_header *msg_h, char *msgbuf, int bufsize)
593
{
594
        debug("ML: received data message called\n");
595

    
596
        int recv_id, free_recv_id = -1;
597

    
598
        if(connectbuf[msg_h->remote_con_id] == NULL) {
599
                debug("ML: Received a message not related to any opened connection!\n");
600
                return;
601
        }
602

    
603
        // check if a recv_data exist and enter data
604
        for (recv_id = 0; recv_id < RECVDATABUFSIZE; recv_id++)
605
                if (recvdatabuf[recv_id] != NULL) {
606
                        if (msg_h->remote_con_id == recvdatabuf[recv_id]->connectionID &&
607
                                        msg_h->msg_seq_num == recvdatabuf[recv_id]->seqnr)
608
                                                break;
609
                } else
610
                        if(free_recv_id == -1)
611
                                free_recv_id = recv_id;
612

    
613

    
614
        if(recv_id == RECVDATABUFSIZE) {
615
                //no recv_data found: create one
616
                recv_id = free_recv_id;
617
                recvdatabuf[recv_id] = (recvdata *) malloc(sizeof(recvdata));
618
                memset(recvdatabuf[recv_id], 0, sizeof(recvdata));
619
                recvdatabuf[recv_id]->connectionID = msg_h->remote_con_id;
620
                recvdatabuf[recv_id]->seqnr = msg_h->msg_seq_num;
621
                recvdatabuf[recv_id]->monitoringDataHeaderLen = msg_h->len_mon_data_hdr;
622
                recvdatabuf[recv_id]->bufsize = msg_h->msg_length + msg_h->len_mon_data_hdr;
623
                recvdatabuf[recv_id]->recvbuf = (char *) malloc(recvdatabuf[recv_id]->bufsize);
624
                /*
625
                * read the timeout data and set it
626
                */
627
                recvdatabuf[recv_id]->timeout_value.tv_sec = recv_timeout.tv_sec;
628
                recvdatabuf[recv_id]->timeout_value.tv_usec = recv_timeout.tv_usec;
629
                recvdatabuf[recv_id]->recvID = recv_id;
630
                recvdatabuf[recv_id]->starttime = time(NULL);
631
                recvdatabuf[recv_id]->msgtype = msg_h->msg_type;
632

    
633
                // fill the buffer with zeros
634
                memset(recvdatabuf[recv_id]->recvbuf, 0, msg_h->msg_length);
635
        }
636

    
637
        if (msg_h->offset == 0)
638
                recvdatabuf[recv_id]->firstPacketArrived = 1;
639

    
640

    
641
        // increment fragmentnr
642
        recvdatabuf[recv_id]->recvFragments++;
643
        // increment the arrivedBytes
644
        recvdatabuf[recv_id]->arrivedBytes += bufsize;
645

    
646
        // enter the data into the buffer
647
        memcpy(recvdatabuf[recv_id]->recvbuf + msg_h->offset, msgbuf, bufsize);
648

    
649
        //TODO very basic checkif all fragments arrived: has to be reviewed
650
        if(recvdatabuf[recv_id]->arrivedBytes == recvdatabuf[recv_id]->bufsize)
651
                recvdatabuf[recv_id]->status = COMPLETE; //buffer full -> msg completly arrived
652
        else
653
                recvdatabuf[recv_id]->status = ACTIVE;
654

    
655
        if (recv_data_callback) {
656
                if(recvdatabuf[recv_id]->status == COMPLETE) {
657
                        // Monitoring layer hook
658
                        if(get_Recv_data_inf_cb != NULL) {
659
                                mon_data_inf recv_data_inf;
660

    
661
                                recv_data_inf.remote_socketID =
662
                                         &(connectbuf[recvdatabuf[recv_id]->connectionID]->external_socketID);
663
                                recv_data_inf.buffer = recvdatabuf[recv_id]->recvbuf;
664
                                recv_data_inf.bufSize = recvdatabuf[recv_id]->bufsize;
665
                                recv_data_inf.msgtype = recvdatabuf[recv_id]->msgtype;
666
                                recv_data_inf.monitoringDataHeaderLen = recvdatabuf[recv_id]->monitoringDataHeaderLen;
667
                                recv_data_inf.monitoringDataHeader = recvdatabuf[recv_id]->monitoringDataHeaderLen ?
668
                                        recvdatabuf[recv_id]->recvbuf : NULL;
669
                                gettimeofday(&recv_data_inf.arrival_time, NULL);
670
                                recv_data_inf.firstPacketArrived = recvdatabuf[recv_id]->firstPacketArrived;
671
                                recv_data_inf.recvFragments = recvdatabuf[recv_id]->recvFragments;
672
                                recv_data_inf.priority = false;
673
                                recv_data_inf.padding = false;
674
                                recv_data_inf.confirmation = false;
675
                                recv_data_inf.reliable = false;
676

    
677
                                // send data recv callback to monitoring module
678

    
679
                                (get_Recv_data_inf_cb) ((void *) &recv_data_inf);
680
                        }
681

    
682
                        // Get the right callback
683
                        receive_data_cb receive_data_callback = recvcbbuf[msg_h->msg_type];
684
                        if (receive_data_callback) {
685

    
686
                                recv_params rParams;
687

    
688
                                rParams.nrMissingBytes = recvdatabuf[recv_id]->bufsize - recvdatabuf[recv_id]->arrivedBytes;
689
                                rParams.recvFragments = recvdatabuf[recv_id]->recvFragments;
690
                                rParams.msgtype = recvdatabuf[recv_id]->msgtype;
691
                                rParams.connectionID = recvdatabuf[recv_id]->connectionID;
692
                                rParams.remote_socketID =
693
                                        &(connectbuf[recvdatabuf[recv_id]->connectionID]->external_socketID);
694
                                rParams.firstPacketArrived = recvdatabuf[recv_id]->firstPacketArrived;
695

    
696
                                (receive_data_callback) (recvdatabuf[recv_id]->recvbuf + recvdatabuf[recv_id]->monitoringDataHeaderLen, recvdatabuf[recv_id]->bufsize - recvdatabuf[recv_id]->monitoringDataHeaderLen,
697
                                        recvdatabuf[recv_id]->msgtype, (void *) &rParams);
698
                        } else {
699
                            warn("ML: callback not initialized for this message type: %d!\n",msg_h->msg_type);
700
                        }
701

    
702
                        //clean up
703
                        free(recvdatabuf[recv_id]->recvbuf);
704
                        free(recvdatabuf[recv_id]);
705
                        recvdatabuf[recv_id] = NULL;
706
                } else { // not COMPLETE
707
                        //start time out
708
                        //TODO make timeout at least a DEFINE
709
                        struct timeval timeout = { 4, 0 };
710
                        event_base_once(base, -1, EV_TIMEOUT, &recv_timeout_cb, (void *) (long)recv_id, &timeout);
711
                }
712
        }
713
}
714

    
715
//done
716
void pmtu_timeout_cb(int fd, short event, void *arg)
717
{
718
        debug("ML: pmtu timeout called\n");
719

    
720
        int con_id = (long) arg;
721
        pmtu new_pmtusize;
722
        struct timeval timeout;
723

    
724
        if(connectbuf[con_id] == NULL) {
725
                error("ML: pmtu timeout called on non existing con_id\n");
726
                return;
727
        }
728

    
729
        if(connectbuf[con_id]->status == READY) {
730
                // nothing to do anymore
731
                return;
732
        }
733

    
734
        timeout = connectbuf[con_id]->timeout_value;
735

    
736
        if(connectbuf[con_id]->delay || connectbuf[con_id]->trials == MAX_TRIALS - 1) {
737
                double delay = timeout.tv_sec + timeout.tv_usec / 1000000.0;
738
                delay = delay * 5;
739
                timeout.tv_sec = floor(delay);
740
                timeout.tv_usec = fmod(delay, 1.0) * 1000000.0;
741
                if(connectbuf[con_id]->delay) {
742
                        connectbuf[con_id]->delay = false;
743
                        goto reschedule;
744
                }
745
        }
746

    
747
        if(connectbuf[con_id]->trials == MAX_TRIALS) {
748
                // decrement the pmtu size
749
                connectbuf[con_id]->pmtusize = pmtu_decrement(connectbuf[con_id]->pmtusize);
750
                connectbuf[con_id]->trials = 0;
751
        }
752

    
753
        //error in PMTU discovery?
754
        if (connectbuf[con_id]->pmtusize == ERROR) {
755
                if (connectbuf[con_id]->internal_connect == true) {
756
                        //as of now we tried directly connecting, now let's try trough the NAT
757
                        connectbuf[con_id]->internal_connect = false;
758
                        connectbuf[con_id]->pmtusize = MAX;
759
                } else {
760
                        //nothing to do we have to give up
761
                        error("ML: Could not create connection with connectionID %i!\n",con_id);
762
                        // envoke the callback for failed connection establishment
763
                        if(failed_Connection_cb != NULL)
764
                                (failed_Connection_cb) (con_id, NULL);
765
                        // delete the connection entry
766
                        mlCloseConnection(con_id);
767
                        return;
768
                }
769
        }
770

    
771
        //retry with new pmtu size
772
        connectbuf[con_id]->trials++;
773
        send_conn_msg(con_id, connectbuf[con_id]->pmtusize, connectbuf[con_id]->status);
774

    
775
reschedule:
776
        /* reschedule */
777
        event_base_once(base, -1, EV_TIMEOUT, pmtu_timeout_cb, (void *) (long)con_id, &timeout);
778
}
779

    
780
/*
781
 * decrements the mtu size
782
 */
783
pmtu pmtu_decrement(pmtu pmtusize)
784
{
785
        pmtu pmtu_return_size;
786
        switch(pmtusize) {
787
        case MAX:
788
                return DSL;
789
        case DSL:
790
                return DSLMEDIUM;
791
        case DSLMEDIUM:
792
                return DSLSLIM;
793
        case DSLSLIM:
794
                return BELOWDSL;
795
        case BELOWDSL:
796
                return MIN;
797
        default:
798
                return ERROR;
799
        }
800
}
801

    
802
void pmtu_error_cb_th(char *msg, int msglen)
803
{
804
        debug("ML: pmtu_error callback called msg_size: %d\n",msglen);
805
        //TODO debug
806
        return;
807

    
808
    char *msgbufptr = NULL;
809
    int msgtype;
810
    int connectionID;
811
    pmtu pmtusize;
812
    pmtu new_pmtusize;
813
    int dead = 0;
814

    
815
    // check the packettype
816
    msgbufptr = &msg[0];
817

    
818
    // check the msgtype
819
    msgbufptr = &msg[1];
820
    memcpy(&msgtype, msgbufptr, 4);
821

    
822
    if (msgtype == 0) {
823

    
824
        // get the connectionID
825
        msgbufptr = &msg[5];
826
        memcpy(&connectionID, msgbufptr, 4);
827

    
828
        int msgtype_c = connectbuf[connectionID]->status;
829
//        pmtusize = connectbuf[connectionID]->pmtutrysize;
830

    
831
        if (msgtype_c != msgtype) {
832
            dead = 1;
833
        }
834

    
835

    
836
    } else if (msgtype == 1) {
837

    
838
        // read the connectionID
839
        msgbufptr = &msg[9];
840
        memcpy(&connectionID, msgbufptr, 4);
841

    
842
        int msgtype_c = connectbuf[connectionID]->status;
843
//        pmtusize = connectbuf[connectionID]->pmtutrysize;
844

    
845
        if (msgtype_c != msgtype) {
846
            dead = 1;
847
        }
848

    
849
    }
850
    // decrement the pmtu size
851
    new_pmtusize = pmtu_decrement(pmtusize);
852

    
853
//    connectbuf[connectionID]->pmtutrysize = new_pmtusize;
854

    
855
    if (new_pmtusize == ERROR) {
856
                error("ML:  Could not create connection with connectionID %i !\n",
857
                        connectionID);
858

    
859
                if(failed_Connection_cb != NULL)
860
                        (failed_Connection_cb) (connectionID, NULL);
861
                // set the message type to a non existent message
862
                msgtype = 2;
863
                // delete the connection entry
864
                 mlCloseConnection(connectionID);
865
        }
866

    
867
    if (msgtype == 0 && dead != 1) {
868

    
869
        // stop the timeout event
870
        // timeout_del(connectbuf[connectionID]->timeout);
871
        /*
872
         * libevent2
873
         */
874

    
875
        // event_del(connectbuf[connectionID]->timeout);
876

    
877

    
878
        // create and send a connection message
879
//         create_conn_msg(new_pmtusize, connectionID,
880
//                         &local_socketID, INVITE);
881

    
882
//        send_conn_msg(connectionID, new_pmtusize);
883

    
884
        // set a timeout event for the pmtu discovery
885
        // timeout_set(connectbuf[connectionID]->timeout,pmtu_timeout_cb,(void
886
        // *)&connectionID);
887

    
888
        // timeout_add(connectbuf[connectionID]->timeout,&connectbuf[connectionID]->timeout_value);
889

    
890
        /*
891
         * libevent2
892
         */
893

    
894
        struct event *ev;
895
        ev = evtimer_new(base, pmtu_timeout_cb,
896
                         (void *) connectbuf[connectionID]);
897

    
898
        // connectbuf[connectionID]->timeout = ev;
899

    
900
        event_add(ev, &connectbuf[connectionID]->timeout_value);
901

    
902
    } else if (msgtype == 1 && dead != 1) {
903

    
904
        // stop the timeout event
905
        // timeout_del(connectbuf[connectionID]->timeout);
906

    
907
        /*
908
         * libevent2
909
         */
910
        // info("still here 11 \n");
911
        // printf("ev %d \n",connectbuf[connectionID]->timeout);
912
        // event_del(connectbuf[connectionID]->timeout );
913
        // evtimer_del(connectbuf[connectionID]->timeout );
914

    
915

    
916
//         // create and send a connection message
917
//         create_conn_msg(new_pmtusize,
918
//                         connectbuf[connectionID]->connectionID,
919
//                         NULL, CONNECT);
920

    
921
        //send_conn_msg(connectionID, new_pmtusize);
922

    
923
        // set a timeout event for the pmtu discovery
924
        // timeout_set(connectbuf[connectionID]->timeout,pmtu_timeout_cb,(void
925
        // *)&connectionID);
926
        // timeout_add(connectbuf[connectionID]->timeout,&connectbuf[connectionID]->timeout_value);
927

    
928
        /*
929
         * libevent2
930
         */
931
        // struct event *ev;
932
        // ev = evtimer_new(base,pmtu_timeout_cb, (void
933
        // *)connectbuf[connectionID]);
934
        // connectbuf[connectionID]->timeout = ev;
935
        // event_add(ev,&connectbuf[connectionID]->timeout_value);
936

    
937
    }
938
}
939

    
940
/*
941
 * what to do once a packet arrived if it is a conn packet send it to
942
 * recv_conn handler if it is a data packet send it to the recv_data
943
 * handler
944
 */
945

    
946
//done --
947
void recv_pkg(int fd, short event, void *arg)
948
{
949
        debug("ML: recv_pkg called\n");
950

    
951
        struct msg_header *msg_h;
952
        char msgbuf[MAX];
953
        char *bufptr = msgbuf;
954
        int ttl;
955
        struct sockaddr_in recv_addr;
956
        pmtu recvSize = MAX;
957
        int msg_size;
958

    
959
        recvPacket(fd, msgbuf, &recvSize, &recv_addr, pmtu_error_cb_th, &ttl);
960

    
961

    
962
        // check if it is not just an ERROR message
963
        if(recvSize < 0)
964
                return;
965

    
966
        // @TODO check if this simplistic STUN message recognition really always works, probably not
967
        unsigned short stun_bind_response = 0x0101;
968
        unsigned short * msgspot = (unsigned short *) msgbuf;
969
        if (*msgspot == stun_bind_response) {
970
                debug("ML: recv_pkg: parse stun message called\n");
971
                recv_stun_msg(msgbuf, recvSize);
972
                return;
973
        }
974

    
975
        msg_h = (struct msg_header *) msgbuf;
976
        bufptr += MSG_HEADER_SIZE + msg_h->len_mon_packet_hdr;
977
        msg_size = recvSize - MSG_HEADER_SIZE - msg_h->len_mon_packet_hdr;
978

    
979

    
980
        if(get_Recv_pkt_inf_cb != NULL && msg_h->len_mon_packet_hdr != 0) {
981
                mon_pkt_inf msginfNow;
982
                msginfNow.monitoringHeaderLen = msg_h->len_mon_packet_hdr;
983
                msginfNow.monitoringHeader = msg_h->len_mon_packet_hdr ? &msgbuf[0] + MSG_HEADER_SIZE : NULL;
984
                //TODO rethink this ...
985
                if(msg_h->msg_type == ML_CON_MSG) {
986
                        struct conn_msg *c_msg = (struct conn_msg *) bufptr;
987
                        msginfNow.remote_socketID = &(c_msg->sock_id);
988
                }
989
                else if(connectbuf[msg_h->remote_con_id] == NULL) {
990
                        error("ML: received pkg called with non existent connection\n");
991
                        return;
992
                } else
993
                        msginfNow.remote_socketID = &(connectbuf[msg_h->remote_con_id]->external_socketID);
994
                msginfNow.buffer = bufptr;
995
                msginfNow.bufSize = recvSize;
996
                msginfNow.msgtype = msg_h->msg_type;
997
                msginfNow.ttl = ttl;
998
                msginfNow.dataID = msg_h->msg_seq_num;
999
                msginfNow.offset = msg_h->offset;
1000
                msginfNow.datasize = msg_h->msg_length;
1001
                gettimeofday(&msginfNow.arrival_time, NULL);
1002
                (get_Recv_pkt_inf_cb) ((void *) &msginfNow);
1003
        }
1004

    
1005

    
1006
        switch(msg_h->msg_type) {
1007
                case ML_CON_MSG:
1008
                        debug("ML: received conn pkg\n");
1009
                        recv_conn_msg(msg_h, bufptr, msg_size);
1010
                        break;
1011
                default:
1012
                        if(msg_h->msg_type < 127) {
1013
                                debug("ML: received data pkg\n");
1014
                                recv_data_msg(msg_h, bufptr, msg_size);
1015
                                break;
1016
                        }
1017
                        debug("ML: unrecognised msg_type\n");
1018
                        break;
1019
        }
1020
}
1021

    
1022
/*
1023
 * compare the external IP address of two socketIDs
1024
 */
1025
int
1026
compare_external_address_socketIDs(socketID_handle sock1, socketID_handle sock2)
1027
{
1028
        if( sock1->external_addr.udpaddr.sin_addr.s_addr == sock2->external_addr.udpaddr.sin_addr.s_addr)
1029
                return 0;
1030
        return 1;
1031
}
1032

    
1033
/*
1034
 * the timeout of the NAT traversal
1035
 */
1036
void nat_traversal_timeout(int fd, short event, void *arg)
1037
{
1038
        if (NAT_traversal == false) {
1039
                debug("ML: NAT traversal request re-send\n");
1040
                if(receive_SocketID_cb)
1041
                        (receive_SocketID_cb) (&local_socketID, 2);
1042
                try_stun();
1043
        }
1044
}
1045

    
1046
unsigned long resolve(const char *ipaddr)
1047
{
1048
        struct hostent *h = gethostbyname(ipaddr);
1049
        if (!h) {
1050
                error("ML: Unable to resolve host name %s\n", ipaddr);
1051
        exit(-1);
1052
    }
1053
    unsigned long *addr = (unsigned long *) (h->h_addr);
1054
    return *addr;
1055
}
1056

    
1057

    
1058
/*
1059
 * returns a handle to the socketID struct the ipaddr can be a null
1060
 * pointer. Then all available ipaddr on the machine are choosen.
1061
 */
1062
void create_socket(const int port, const char *ipaddr)
1063
{
1064
        struct sockaddr_in udpaddr;
1065
        udpaddr.sin_family = AF_INET;
1066
        if (ipaddr == NULL) {
1067
                /*
1068
                * try to guess the local IP address
1069
                */
1070
                const char *ipaddr_iface = mlAutodetectIPAddress();
1071
                if (ipaddr_iface) {
1072
                        udpaddr.sin_addr.s_addr = inet_addr(ipaddr_iface);
1073
                } else {
1074
                        udpaddr.sin_addr.s_addr = INADDR_ANY;
1075
                }
1076
        } else {
1077
                udpaddr.sin_addr.s_addr = inet_addr(ipaddr);
1078
        }
1079
        udpaddr.sin_port = htons(port);
1080

    
1081
        socketaddrgen udpgen;
1082
        memset(&udpgen,0,sizeof(socketaddrgen));        //this will be sent over the net, so set it to 0
1083
        udpgen.udpaddr = udpaddr;
1084
        local_socketID.internal_addr = udpgen;
1085

    
1086
        socketfd = createSocket(port, ipaddr);
1087

    
1088
        struct event *ev;
1089
        ev = event_new(base, socketfd, EV_READ | EV_PERSIST, recv_pkg, NULL);
1090

    
1091
        event_add(ev, NULL);
1092

    
1093
        try_stun();
1094
}
1095

    
1096
void try_stun()
1097
{
1098
        if (isStunDefined()) {
1099
                /*
1100
                * send the NAT traversal STUN request
1101
                */
1102
                 send_stun_request(socketfd, &stun_server);
1103

    
1104
                /*
1105
                * enter a NAT traversal timeout that takes care of retransmission
1106
                */
1107
                struct event *ev1;
1108
                struct timeval timeout_value_NAT_traversal = { 2, 0 };
1109
                ev1 = evtimer_new(base, nat_traversal_timeout, NULL);
1110
                event_add(ev1, &timeout_value_NAT_traversal);
1111

    
1112
                NAT_traversal = false;
1113
        } else {
1114
                /*
1115
                * Assume we have accessibility and copy internal address to external one
1116
                */
1117
                local_socketID.external_addr = local_socketID.internal_addr;
1118
                NAT_traversal = true; // @TODO: this is not really NAT traversal, but a flag that init is over
1119
                // callback to the upper layer indicating that the socketID is now
1120
                // ready to use
1121
                if(receive_SocketID_cb)
1122
                        (receive_SocketID_cb) (&local_socketID, 0); //success
1123
        }
1124
}
1125

    
1126
/**************************** END OF INTERNALS ***********************/
1127

    
1128
void 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){
1129

    
1130
        base = (struct event_base *) arg;
1131
        recv_data_callback = recv_data_cb;
1132
        mlSetRecvTimeout(timeout_value);
1133
        if (stun_ipaddr) {
1134
                 mlSetStunServer(stun_port, stun_ipaddr);
1135
        } else {
1136

    
1137
        }
1138
        register_recv_localsocketID_cb(local_socketID_cb);
1139
        create_socket(port, ipaddr);
1140

    
1141
}
1142

    
1143
/* register callbacks  */
1144
void mlRegisterGetRecvPktInf(get_recv_pkt_inf_cb recv_pkt_inf_cb){
1145

    
1146
        if (recv_pkt_inf_cb == NULL)
1147
                error("ML: Register get_recv_pkt_inf_cb failed: NULL ptr  \n");
1148
        else
1149
                get_Recv_pkt_inf_cb = recv_pkt_inf_cb;
1150

    
1151
}
1152

    
1153
void mlRegisterGetSendPktInf(get_send_pkt_inf_cb  send_pkt_inf_cb){
1154

    
1155
        if (send_pkt_inf_cb == NULL)
1156
                error("ML: Register get_send_pkt_inf_cb: NULL ptr  \n");
1157
        else
1158
                get_Send_pkt_inf_cb = send_pkt_inf_cb;
1159

    
1160
}
1161

    
1162

    
1163
void mlRegisterSetMonitoringHeaderPktCb(set_monitoring_header_pkt_cb monitoring_header_pkt_cb ){
1164

    
1165
        if (monitoring_header_pkt_cb == NULL)
1166
                error("ML: Register set_monitoring_header_pkt_cb: NULL ptr  \n");
1167
        else
1168
                set_Monitoring_header_pkt_cb = monitoring_header_pkt_cb;
1169

    
1170
}
1171

    
1172
void mlRegisterGetRecvDataInf(get_recv_data_inf_cb recv_data_inf_cb){
1173

    
1174
        if (recv_data_inf_cb == NULL)
1175
                error("ML: Register get_recv_data_inf_cb: NULL ptr  \n");
1176
        else
1177
                get_Recv_data_inf_cb = recv_data_inf_cb;
1178

    
1179
}
1180

    
1181
void mlRegisterGetSendDataInf(get_send_data_inf_cb  send_data_inf_cb){
1182

    
1183
        if (send_data_inf_cb == NULL)
1184
                error("ML: Register get_send_data_inf_cb: NULL ptr  \n");
1185
        else
1186
                get_Send_data_inf_cb = send_data_inf_cb;
1187

    
1188
}
1189

    
1190
void mlRegisterSetMonitoringHeaderDataCb(set_monitoring_header_data_cb monitoring_header_data_cb){
1191

    
1192
        if (monitoring_header_data_cb == NULL)
1193
                error("ML: Register set_monitoring_header_data_cb : NULL ptr  \n");
1194
        else
1195
        set_Monitoring_header_data_cb = monitoring_header_data_cb;
1196

    
1197
}
1198

    
1199
void mlRegisterRecvConnectionCb(receive_connection_cb recv_conn_cb){
1200

    
1201
        if (recv_conn_cb == NULL)
1202
                error("ML: Register receive_connection_cb: NULL ptr  \n");
1203
        else
1204
                receive_Connection_cb = recv_conn_cb;
1205

    
1206
}
1207

    
1208
void mlRegisterErrorConnectionCb(connection_failed_cb conn_failed){
1209

    
1210
        if (conn_failed == NULL)
1211
                error("ML: Register connection_failed_cb: NULL ptr  \n");
1212
        else
1213
        failed_Connection_cb = conn_failed;
1214

    
1215
}
1216

    
1217
void mlRegisterRecvDataCb(receive_data_cb data_cb,unsigned char msgtype){
1218

    
1219
    if (msgtype > 126) {
1220

    
1221
            error
1222
            ("ML: Could not register recv_data callback. Msgtype is greater then 126 \n");
1223

    
1224
    }
1225

    
1226
    if (data_cb == NULL) {
1227

    
1228
            error("ML: Register receive data callback: NUll ptr \n ");
1229

    
1230
    } else {
1231

    
1232
        recvcbbuf[msgtype] = data_cb;
1233

    
1234
    }
1235

    
1236
}
1237

    
1238
void mlCloseSocket(socketID_handle socketID){
1239

    
1240
        free(socketID);
1241

    
1242
}
1243

    
1244
void keepalive_fn(evutil_socket_t fd, short what, void *arg) {
1245
        socketID_handle peer = arg;
1246

    
1247
        int con_id = mlConnectionExist(peer, false);
1248
        if (con_id < 0 || connectbuf[con_id]->defaultSendParams.keepalive <= 0) {
1249
                /* Connection fell from under us or keepalive was disabled */
1250
                free(arg);
1251
                return;
1252
        }
1253

    
1254
        /* do what we gotta do */
1255
        if ( connectbuf[con_id]->status == READY) {
1256
                char keepaliveMsg[32] = "";
1257
                sprintf(keepaliveMsg, "KEEPALIVE %d", connectbuf[con_id]->keepalive_seq++);
1258
                send_msg(con_id, MSG_TYPE_ML_KEEPALIVE, keepaliveMsg, 1 + strlen(keepaliveMsg), false, 
1259
                        &(connectbuf[con_id]->defaultSendParams));
1260
        }
1261

    
1262
        /* re-schedule */
1263
        struct timeval t = { 0,0 };
1264
        t.tv_sec = time(NULL) + connectbuf[con_id]->defaultSendParams.keepalive;
1265

    
1266
        event_base_once(base, -1, EV_TIMEOUT, keepalive_fn, peer, &t);
1267
}
1268

    
1269
void setupKeepalive(int conn_id) {
1270
        /* Save the peer's address for us */
1271
        socketID_handle peer = malloc(sizeof(socket_ID));
1272
        memcpy(peer, &connectbuf[conn_id]->external_socketID, sizeof(socket_ID));
1273

    
1274
        struct timeval t = { 0,0 };
1275
        t.tv_sec = time(NULL) + connectbuf[conn_id]->defaultSendParams.keepalive;
1276

    
1277
        event_base_once(base, -1, EV_TIMEOUT, keepalive_fn, peer, &t);
1278
}
1279

    
1280
/* connection functions */
1281
int mlOpenConnection(socketID_handle external_socketID,receive_connection_cb connection_cb,void *arg, const send_params defaultSendParams){
1282

    
1283
        int con_id;
1284
        if (external_socketID == NULL) {
1285
                error("ML: cannot open connection: one of the socketIDs is NULL\n");
1286
                return -1;
1287
        }
1288
        if (NAT_traversal == false) {
1289
                error("ML: cannot open connection: NAT traversal for socketID still in progress\n");
1290
                return -1;
1291
        }
1292
        if (connection_cb == NULL) {
1293
                error("ML: cannot open connection: connection_cb is NULL\n");
1294
                return -1;
1295
        }
1296

    
1297
        // check if that connection already exist
1298

    
1299
        con_id = mlConnectionExist(external_socketID, false);
1300
        if (con_id >= 0) {
1301
                // overwrite defaultSendParams
1302
                bool newKeepalive = 
1303
                        connectbuf[con_id]->defaultSendParams.keepalive == 0 && defaultSendParams.keepalive != 0;
1304
                connectbuf[con_id]->defaultSendParams = defaultSendParams;
1305
                if (newKeepalive) setupKeepalive(con_id);
1306
                // if so check if it is ready to use
1307
                if (connectbuf[con_id]->status == READY) {
1308
                                // if so use the callback immediateley
1309
                                (connection_cb) (con_id, arg);
1310

    
1311
                // otherwise just write the connection cb and the arg pointer
1312
                // into the connection struct
1313
                } else {
1314
                        struct receive_connection_cb_list *temp;
1315
                        temp = malloc(sizeof(struct receive_connection_cb_list));
1316
                        temp->next = NULL;
1317
                        temp->connection_cb = connection_cb;
1318
                        temp->arg = arg;
1319
                        if(connectbuf[con_id]->connection_last != NULL) {
1320
                                connectbuf[con_id]->connection_last->next = temp;
1321
                                connectbuf[con_id]->connection_last = temp;
1322
                        } else
1323
                                connectbuf[con_id]->connection_last = connectbuf[con_id]->connection_head = temp;
1324
                }
1325
                return con_id;
1326
        }
1327
        // make entry in connection_establishment array
1328
        for (con_id = 0; con_id < CONNECTBUFSIZE; con_id++) {
1329
                if (connectbuf[con_id] == NULL) {
1330
                        connectbuf[con_id] = (connect_data *) malloc(sizeof(connect_data));
1331
                        memset(connectbuf[con_id],0,sizeof(connect_data));
1332
                        connectbuf[con_id]->starttime = time(NULL);
1333
                        memcpy(&connectbuf[con_id]->external_socketID, external_socketID, sizeof(socket_ID));
1334
                        connectbuf[con_id]->pmtusize = MAX;
1335
                        connectbuf[con_id]->status = INVITE;
1336
                        connectbuf[con_id]->seqnr = 0;
1337
                        connectbuf[con_id]->internal_connect = !compare_external_address_socketIDs(external_socketID, &local_socketID);
1338
                        /*
1339
                        * timeout values for the pmtu discovery
1340
                        */
1341
                        connectbuf[con_id]->timeout_value.tv_sec = 15;
1342
                        connectbuf[con_id]->timeout_value.tv_usec = 0;
1343
                        connectbuf[con_id]->connectionID = con_id;
1344

    
1345
                        connectbuf[con_id]->connection_head = connectbuf[con_id]->connection_last = malloc(sizeof(struct receive_connection_cb_list));
1346
                        connectbuf[con_id]->connection_last->next = NULL;
1347
                        connectbuf[con_id]->connection_last->connection_cb = connection_cb;
1348
                        connectbuf[con_id]->connection_last->arg = arg;
1349
                        connectbuf[con_id]->external_connectionID = -1;
1350

    
1351
                        connectbuf[con_id]->defaultSendParams = defaultSendParams;
1352
                        if (defaultSendParams.keepalive) setupKeepalive(con_id);
1353
                        break;
1354
                }
1355
        } //end of for
1356

    
1357
        if (con_id == CONNECTBUFSIZE) {
1358
                error("ML: Could not open connection: connection buffer full\n");
1359
                return -1;
1360
        }
1361

    
1362
        // create and send a connection message
1363
        send_conn_msg(con_id, MAX, INVITE);
1364

    
1365
        struct event *ev;
1366
        ev = evtimer_new(base, pmtu_timeout_cb, (void *) (long)con_id);
1367
        event_add(ev, &connectbuf[con_id]->timeout_value);
1368

    
1369
        return con_id;
1370

    
1371
}
1372

    
1373
void mlCloseConnection(const int connectionID){
1374

    
1375
        // remove it from the connection array
1376
        if(connectbuf[connectionID]) {
1377
                if(connectbuf[connectionID]->ctrl_msg_buf)
1378
                        free(connectbuf[connectionID]->ctrl_msg_buf);
1379
                free(connectbuf[connectionID]);
1380
                connectbuf[connectionID] = NULL;
1381
        }
1382

    
1383
}
1384

    
1385
void mlSendData(const int connectionID,char *sendbuf,int bufsize,unsigned char msgtype,send_params *sParams){
1386

    
1387
        if (connectionID < 0) {
1388
                error("ML: send data failed: connectionID does not exist\n");
1389
                return;
1390
        }
1391

    
1392
        if (connectbuf[connectionID] == NULL) {
1393
                error("ML: send data failed: connectionID does not exist\n");
1394
                return;
1395
        }
1396
        if (connectbuf[connectionID]->status != READY) {
1397
            error("ML: send data failed: connection is not active\n");
1398
            return;
1399
        }
1400

    
1401
        if (sParams == NULL) {
1402
                sParams = &(connectbuf[connectionID]->defaultSendParams);
1403
        }
1404

    
1405
        send_msg(connectionID, msgtype, sendbuf, bufsize, false, sParams);
1406

    
1407
}
1408

    
1409
/* transmit data functions  */
1410
int mlSendAllData(const int connectionID,send_all_data_container *container,int nr_entries,unsigned char msgtype,send_params *sParams){
1411

    
1412
    if (nr_entries < 1 || nr_entries > 5) {
1413

    
1414
        error
1415
            ("ML : sendALlData : nr_enties is not between 1 and 5 \n ");
1416
        return 0;
1417

    
1418
    } else {
1419

    
1420
        if (nr_entries == 1) {
1421

    
1422
                mlSendData(connectionID, container->buffer_1,
1423
                      container->length_1, msgtype, sParams);
1424

    
1425
            return 1;
1426

    
1427
        } else if (nr_entries == 2) {
1428

    
1429
            int buflen = container->length_1 + container->length_2;
1430
            char buf[buflen];
1431
            memcpy(buf, container->buffer_1, container->length_1);
1432
            memcpy(&buf[container->length_1], container->buffer_2,
1433
                   container->length_2);
1434
            mlSendData(connectionID, buf, buflen, msgtype, sParams);
1435

    
1436
            return 1;
1437

    
1438
        } else if (nr_entries == 3) {
1439

    
1440
            int buflen =
1441
                container->length_1 + container->length_2 +
1442
                container->length_3;
1443
            char buf[buflen];
1444
            memcpy(buf, container->buffer_1, container->length_1);
1445
            memcpy(&buf[container->length_1], container->buffer_2,
1446
                   container->length_2);
1447
            memcpy(&buf[container->length_2], container->buffer_3,
1448
                   container->length_3);
1449
            mlSendData(connectionID, buf, buflen, msgtype, sParams);
1450

    
1451

    
1452
            return 1;
1453

    
1454
        } else if (nr_entries == 4) {
1455

    
1456
            int buflen =
1457
                container->length_1 + container->length_2 +
1458
                container->length_3 + container->length_4;
1459
            char buf[buflen];
1460
            memcpy(buf, container->buffer_1, container->length_1);
1461
            memcpy(&buf[container->length_1], container->buffer_2,
1462
                   container->length_2);
1463
            memcpy(&buf[container->length_2], container->buffer_3,
1464
                   container->length_3);
1465
            memcpy(&buf[container->length_3], container->buffer_4,
1466
                   container->length_4);
1467
            mlSendData(connectionID, buf, buflen, msgtype, sParams);
1468

    
1469
            return 1;
1470

    
1471
        } else {
1472

    
1473
            int buflen =
1474
                container->length_1 + container->length_2 +
1475
                container->length_3 + container->length_4 +
1476
                container->length_5;
1477
            char buf[buflen];
1478
            memcpy(buf, container->buffer_1, container->length_1);
1479
            memcpy(&buf[container->length_1], container->buffer_2,
1480
                   container->length_2);
1481
            memcpy(&buf[container->length_2], container->buffer_3,
1482
                   container->length_3);
1483
            memcpy(&buf[container->length_3], container->buffer_4,
1484
                   container->length_4);
1485
            memcpy(&buf[container->length_4], container->buffer_5,
1486
                   container->length_5);
1487
            mlSendData(connectionID, buf, buflen, msgtype, sParams);
1488

    
1489
            return 1;
1490
        }
1491

    
1492
    }
1493

    
1494
}
1495

    
1496
int mlRecvData(const int connectionID,char *recvbuf,int *bufsize,recv_params *rParams){
1497

    
1498
        //TODO yet to be converted
1499
        return 0;
1500
#if 0
1501
        if (rParams == NULL) {
1502
                error("ML: recv_data failed: recv_params is a NULL ptr\n");
1503
                return 0;
1504
    } else {
1505

1506
        info("ML: recv data called \n");
1507

1508
        int i = 0;
1509
        int returnValue = 0;
1510
        double timeout = (double) recv_timeout.tv_sec;
1511
        time_t endtime = time(NULL);
1512

1513
        for (i = 0; i < RECVDATABUFSIZE; i++) {
1514

1515
            if (recvdatabuf[i] != NULL) {
1516

1517
                if (recvdatabuf[i]->connectionID == connectionID) {
1518

1519
                    info("ML: recv data has entry  \n");
1520

1521
                    double timepass = difftime(endtime, recvdatabuf[i]->starttime);
1522

1523
                    // check if the specified connection has data and it
1524
                    // is complete
1525
                    // check the data seqnr
1526
                    // if(connectionID == recvdatabuf[i]->connectionID &&
1527
                    // 1 == recvdatabuf[i]->status){
1528

1529
                    if (1 == recvdatabuf[i]->status) {
1530

1531
                        // info("transmissionHandler: recv_data set is
1532
                        // complete \n" );
1533

1534
                        // debug("debud \n");
1535

1536
                        // exchange the pointers
1537
                        int buffersize = 0;
1538
                        buffersize = recvdatabuf[i]->bufsize;
1539
                        *bufsize = buffersize;
1540
                        // recvbuf = recvdatabuf[i]->recvbuf;
1541

1542
                        // info("buffersize %d \n",buffersize);
1543
                        memcpy(recvbuf, recvdatabuf[i]->recvbuf,
1544
                               buffersize);
1545
                        // debug(" recvbuf %s \n",recvbuf );
1546

1547
//                         double nrMissFrags =
1548
//                             (double) recvdatabuf[i]->nrFragments /
1549
//                             (double) recvdatabuf[i]->recvFragments;
1550
//                         int nrMissingFragments = (int) ceil(nrMissFrags);
1551

1552
//                        rParams->nrMissingFragments = nrMissingFragments;
1553
//                         rParams->nrFragments = recvdatabuf[i]->nrFragments;
1554
                        rParams->msgtype = recvdatabuf[i]->msgtype;
1555
                        rParams->connectionID =
1556
                            recvdatabuf[i]->connectionID;
1557

1558
                        // break from the loop
1559
                        // debug(" recvbuf %s \n ",recvbuf);
1560

1561
                        // double nrMissFrags =
1562
                        // (double)recvdatabuf[i]->nrFragments /
1563
                        // (double)recvdatabuf[i]->recvFragments;
1564
                        // int nrMissingFragments =
1565
                        // (int)ceil(nrMissFrags);
1566

1567
                        if(get_Recv_data_inf_cb != NULL) {
1568
                                mon_data_inf recv_data_inf;
1569

1570
                                recv_data_inf.remote_socketID = &(connectbuf[connectionID]->external_socketID);
1571
                                recv_data_inf.buffer = recvdatabuf[i]->recvbuf;
1572
                                recv_data_inf.bufSize = recvdatabuf[i]->bufsize;
1573
                                recv_data_inf.msgtype = recvdatabuf[i]->msgtype;
1574
//                                 recv_data_inf.monitoringHeaderType = recvdatabuf[i]->monitoringHeaderType;
1575
//                                 recv_data_inf.monitoringDataHeader = recvdatabuf[i]->monitoringDataHeader;
1576
                                gettimeofday(&recv_data_inf.arrival_time, NULL);
1577
                                recv_data_inf.firstPacketArrived = recvdatabuf[i]->firstPacketArrived;
1578
                                recv_data_inf.nrMissingFragments = nrMissingFragments;
1579
                                recv_data_inf.nrFragments = recvdatabuf[i]->nrFragments;
1580
                                recv_data_inf.priority = false;
1581
                                recv_data_inf.padding = false;
1582
                                recv_data_inf.confirmation = false;
1583
                                recv_data_inf.reliable = false;
1584

1585
                                // send data recv callback to monitoring module
1586

1587
                                (get_Recv_data_inf_cb) ((void *) &recv_data_inf);
1588
                        }
1589

1590

1591
                        // free the allocated memory
1592
                        free(recvdatabuf[i]);
1593
                        recvdatabuf[i] = NULL;
1594

1595
                        returnValue = 1;
1596
                        break;
1597

1598
                    }
1599

1600
                    if (recvdatabuf[i] != NULL) {
1601

1602
                        if (timepass > timeout) {
1603

1604
                            info("ML: recv_data timeout called  \n");
1605

1606
                            // some data about the missing chunks should
1607
                            // be added here
1608
                            // exchange the pointers
1609
                            int buffersize = 0;
1610
                            buffersize = recvdatabuf[i]->bufsize;
1611
                            *bufsize = buffersize;
1612
                            // recvbuf = recvdatabuf[i]->recvbuf;
1613

1614
                            double nrMissFrags =
1615
                                (double) recvdatabuf[i]->nrFragments /
1616
                                (double) recvdatabuf[i]->recvFragments;
1617
                            int nrMissingFragments =
1618
                                (int) ceil(nrMissFrags);
1619

1620
                            // debug(" recvbuf %s \n",recvbuf );
1621

1622
                            memcpy(recvbuf, recvdatabuf[i]->recvbuf,
1623
                                   buffersize);
1624

1625
                            rParams->nrMissingFragments =
1626
                                nrMissingFragments;
1627
                            rParams->nrFragments =
1628
                                recvdatabuf[i]->nrFragments;
1629
                            rParams->msgtype = recvdatabuf[i]->msgtype;
1630
                            rParams->connectionID =
1631
                                recvdatabuf[i]->connectionID;
1632

1633
                                if(get_Recv_data_inf_cb != NULL) {
1634
                                        mon_data_inf recv_data_inf;
1635

1636
                                        recv_data_inf.remote_socketID = &(connectbuf[connectionID]->external_socketID);
1637
                                        recv_data_inf.buffer = recvdatabuf[i]->recvbuf;
1638
                                        recv_data_inf.bufSize = recvdatabuf[i]->bufsize;
1639
                                        recv_data_inf.msgtype = recvdatabuf[i]->msgtype;
1640
                                        recv_data_inf.monitoringHeaderType = recvdatabuf[i]->monitoringHeaderType;
1641
                                        recv_data_inf.monitoringDataHeader = recvdatabuf[i]->monitoringDataHeader;
1642
                                        gettimeofday(&recv_data_inf.arrival_time, NULL);
1643
                                        recv_data_inf.firstPacketArrived = recvdatabuf[i]->firstPacketArrived;
1644
                                        recv_data_inf.nrMissingFragments = nrMissingFragments;
1645
                                        recv_data_inf.nrFragments = recvdatabuf[i]->nrFragments;
1646
                                        recv_data_inf.priority = false;
1647
                                        recv_data_inf.padding = false;
1648
                                        recv_data_inf.confirmation = false;
1649
                                        recv_data_inf.reliable = false;
1650

1651
                                        // send data recv callback to monitoring module
1652

1653
                                        (get_Recv_data_inf_cb) ((void *) &recv_data_inf);
1654
                                }
1655

1656
                            // free the allocated memory
1657
                            free(recvdatabuf[i]);
1658
                            recvdatabuf[i] = NULL;
1659

1660
                            returnValue = 1;
1661
                            break;
1662

1663
                        }
1664
                    }
1665

1666
                }
1667

1668
            }
1669
            // debug("2 recvbuf %s \n ",recvbuf);
1670
        }
1671
        return returnValue;
1672
    }
1673
#endif
1674

    
1675
}
1676

    
1677
/* setter  */
1678
void mlSetStunServer(const int port,const char *ipaddr){
1679

    
1680
        stun_server.sin_family = AF_INET;
1681
        if (ipaddr == NULL)
1682
                stun_server.sin_addr.s_addr = htonl(INADDR_ANY);
1683
        else
1684
                stun_server.sin_addr.s_addr = resolve(ipaddr);
1685
        stun_server.sin_port = htons(port);
1686

    
1687
}
1688

    
1689
void mlSetRecvTimeout(struct timeval timeout_value){
1690

    
1691
        recv_timeout = timeout_value;
1692

    
1693
}
1694

    
1695
int mlGetStandardTTL(socketID_handle socketID,uint8_t *ttl){
1696

    
1697
        return getTTL(socketfd, ttl);
1698

    
1699
}
1700

    
1701
socketID_handle mlGetLocalSocketID(int *errorstatus){
1702

    
1703
        if (NAT_traversal == false) {
1704
                *errorstatus = 2;
1705
                return NULL;
1706
        }
1707

    
1708
        *errorstatus = 0;
1709
        return &local_socketID;
1710

    
1711
}
1712

    
1713
int mlGetExternalIP(char* external_addr){
1714

    
1715
        socketaddrgen udpgen;
1716
        struct sockaddr_in udpaddr;
1717

    
1718
        udpgen = local_socketID.external_addr;
1719
        udpaddr = udpgen.udpaddr;
1720

    
1721
        inet_ntop(AF_INET, &(udpaddr.sin_addr), external_addr,
1722
                        INET_ADDRSTRLEN);
1723

    
1724
        if (external_addr == NULL) {
1725

    
1726
        return -1;
1727

    
1728
        } else {
1729

    
1730
        return 0;
1731

    
1732
        }
1733

    
1734
}
1735

    
1736
int mlSocketIDToString(socketID_handle socketID,char* socketID_string, size_t len){
1737

    
1738
        char internal_addr[INET_ADDRSTRLEN];
1739
        char external_addr[INET_ADDRSTRLEN];
1740
        inet_ntop(AF_INET, &(socketID->internal_addr.udpaddr.sin_addr.s_addr), internal_addr, INET_ADDRSTRLEN);
1741
        inet_ntop(AF_INET, &(socketID->external_addr.udpaddr.sin_addr.s_addr), external_addr, INET_ADDRSTRLEN);
1742

    
1743
        snprintf(socketID_string,len,"%s:%d-%s:%d", internal_addr, ntohs(socketID->internal_addr.udpaddr.sin_port),
1744
                external_addr,        ntohs(socketID->external_addr.udpaddr.sin_port));
1745
        return 0;
1746

    
1747
}
1748

    
1749
int mlStringToSocketID(const char* socketID_string, socketID_handle socketID){
1750

    
1751
        //@TODO add checks against malformed string
1752
        char external_addr[INET_ADDRSTRLEN];
1753
        int external_port;
1754
        char internal_addr[INET_ADDRSTRLEN];
1755
        int internal_port;
1756

    
1757
        char *pch;
1758
        char *s = strdup(socketID_string);
1759

    
1760
        //replace ':' with a blank
1761
        pch=strchr(s,':');
1762
        while (pch!=NULL){
1763
                                *pch = ' ';
1764
                pch=strchr(pch+1,':');
1765
        }
1766
        pch=strchr(s,'-');
1767
        if(pch) *pch = ' ';
1768

    
1769
        sscanf(s,"%s %d %s %d", internal_addr, &internal_port,
1770
                external_addr, &external_port);
1771

    
1772
        if(inet_pton(AF_INET, internal_addr, &(socketID->internal_addr.udpaddr.sin_addr)) == 0)
1773
                return EINVAL;
1774
        socketID->internal_addr.udpaddr.sin_family = AF_INET;
1775
        socketID->internal_addr.udpaddr.sin_port = htons(internal_port);
1776

    
1777

    
1778
        if(inet_pton(AF_INET, external_addr, &(socketID->external_addr.udpaddr.sin_addr)) ==0)
1779
                return EINVAL;
1780
        socketID->external_addr.udpaddr.sin_family = AF_INET;
1781
        socketID->external_addr.udpaddr.sin_port = htons(external_port);
1782

    
1783
        free(s);
1784
        return 0;
1785

    
1786
}
1787

    
1788
int mlGetConnectionStatus(int connectionID){
1789

    
1790
        if(connectbuf[connectionID])
1791
                return connectbuf[connectionID]->status == READY;
1792
        return -1;
1793
    
1794
}
1795

    
1796

    
1797
int mlConnectionExist(socketID_handle socketID, bool ready){
1798

    
1799
    /*
1800
     * check if another connection for the external connectionID exist
1801
     * that was established \ within the last 2 seconds
1802
     */
1803
        int i;
1804
        for (i = 0; i < CONNECTBUFSIZE; i++)
1805
                if (connectbuf[i] != NULL)
1806
                        if (mlCompareSocketIDs(&(connectbuf[i]->external_socketID), socketID) == 0) {
1807
                                if (ready) return (connectbuf[i]->status == READY ? i : -1);;
1808
                                return i;
1809
                                }
1810

    
1811
    return -1;
1812

    
1813
}
1814

    
1815
//Added by Robert Birke as comodity functions
1816

    
1817
//int mlPrintSocketID(socketID_handle socketID) {
1818
//        char str[SOCKETID_STRING_SIZE];
1819
//        mlSocketIDToString(socketID, str, sizeof(str));
1820
//        printf(stderr,"int->%s<-ext\n",str);
1821
//}
1822

    
1823
/*
1824
 * hash code of a socketID
1825
 * TODO might think of a better way
1826
 */
1827
int mlHashSocketID(socketID_handle sock) {
1828
    return sock->internal_addr.udpaddr.sin_port +
1829
                          sock->external_addr.udpaddr.sin_port;
1830
}
1831

    
1832
int mlCompareSocketIDs(socketID_handle sock1, socketID_handle sock2) {
1833
        /*
1834
        * compare internal addr
1835
        */
1836
        if (sock1->internal_addr.udpaddr.sin_addr.s_addr !=
1837
            sock2->internal_addr.udpaddr.sin_addr.s_addr)
1838
                        return 1;
1839

    
1840
        if (sock1->internal_addr.udpaddr.sin_port !=
1841
                 sock2->internal_addr.udpaddr.sin_port)
1842
                        return 1;
1843

    
1844
        /*
1845
        * compare external addr
1846
        */
1847
        if (sock1->external_addr.udpaddr.sin_addr.s_addr !=
1848
            sock2->external_addr.udpaddr.sin_addr.s_addr)
1849
                        return 1;
1850

    
1851
        if (sock1->external_addr.udpaddr.sin_port !=
1852
                 sock2->external_addr.udpaddr.sin_port)
1853
                        return 1;
1854

    
1855
        return 0;
1856
}
1857

    
1858
int mlCompareSocketIDsByPort(socketID_handle sock1, socketID_handle sock2)
1859
{ 
1860
        if (sock1->internal_addr.udpaddr.sin_port !=
1861
                 sock2->internal_addr.udpaddr.sin_port)
1862
                        return 1;
1863

    
1864
        if (sock1->external_addr.udpaddr.sin_port !=
1865
                 sock2->external_addr.udpaddr.sin_port)
1866
                        return 1;
1867
        return 0;
1868
}
1869

    
1870
int mlGetPathMTU(int ConnectionId) {
1871
        if(ConnectionId < 0 || ConnectionId >= CONNECTBUFSIZE)
1872
                return -1;
1873
        if (connectbuf[ConnectionId] != NULL)
1874
                return connectbuf[ConnectionId]->pmtusize;
1875
        return -1;
1876
}