summaryrefslogtreecommitdiff
path: root/src/ipcpd/shim-udp/main.c
blob: 66513b0213c21d470876d157dbc036a084dd68ab (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
/*
 * Ouroboros - Copyright (C) 2016
 *
 * Shim IPC process over UDP
 *
 *    Dimitri Staessens <dimitri.staessens@intec.ugent.be>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <ouroboros/config.h>

#include "ipcp.h"
#include "flow.h"
#include <ouroboros/shm_du_map.h>
#include <ouroboros/list.h>
#include <ouroboros/utils.h>
#include <ouroboros/ipcp.h>
#include <ouroboros/dif_config.h>

#define OUROBOROS_PREFIX "ipcpd/shim-udp"

#include <ouroboros/logs.h>

#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <netinet/in.h>
#include <signal.h>
#include <stdlib.h>
#include <pthread.h>

#include "irmd_messages.pb-c.h"

typedef IrmMsg irm_msg_t;

#include "ipcpd_messages.pb-c.h"

typedef IpcpMsg ipcp_msg_t;

#define THIS_TYPE IPCP_SHIM_UDP
#define LISTEN_PORT htons(0x0D1F)
#define SHIM_UDP_BUF_SIZE 256

#define shim_data(type) ((struct ipcp_udp_data *) type->data)

#define local_ip (((struct ipcp_udp_data *)                              \
                         _ipcp->data)->s_saddr.sin_addr.s_addr)

/* global for trapping signal */
int irmd_pid;

/* this IPCP's data */
#ifdef MAKE_CHECK
extern struct ipcp * _ipcp; /* defined in test */
#else
struct ipcp * _ipcp;
#endif

struct ipcp_udp_data {
        /* IPCP_DATA STRUCT MUST BE FIRST!! */
        struct ipcp_data ipcp_data;

        uint32_t ip_addr;
        uint32_t dns_addr;

        /* listen server */
        struct sockaddr_in s_saddr;
        int                s_fd;

        pthread_mutex_t   lock;
};

struct udp_flow {
        /* FLOW MUST BE FIRST !!!! */
        flow_t flow;
        int    fd;
};

void ipcp_sig_handler(int sig, siginfo_t * info, void * c)
{
        switch(sig) {
        case SIGINT:
        case SIGTERM:
        case SIGHUP:
                LOG_DBG("Terminating by order of %d. Bye.", info->si_pid);
                if (info->si_pid == irmd_pid) {
                        shm_du_map_close(_ipcp->data->dum);
                        exit(0);
                }
        default:
                return;
        }
}

struct ipcp_udp_data * ipcp_udp_data_create(char * ap_name,
                                            char * ap_id)
{
        struct ipcp_udp_data * udp_data;
        struct ipcp_data *     data;
        instance_name_t *      instance_name;
        enum ipcp_type         ipcp_type;

        instance_name = instance_name_create();
        if (instance_name  == NULL) {
                LOG_ERR("Failed to create instance name struct.");
                return NULL;
        }

        instance_name = instance_name_init_with(
                instance_name, ap_name, (uint16_t)atoi(ap_id));

        if (instance_name  == NULL) {
                LOG_ERR("Failed to create instance name struct.");
                return NULL;
        }

        udp_data= malloc (sizeof *udp_data);
        if (udp_data == NULL) {
                LOG_DBGF("Failed to allocate.");
                return NULL;
        }

        ipcp_type = THIS_TYPE;
        data = (struct ipcp_data *) udp_data;
        if (ipcp_data_init(data, instance_name, ipcp_type) == NULL) {
                free(udp_data);
                return NULL;
        }

        return udp_data;
}

void * ipcp_udp_listener()
{
        char buf[SHIM_UDP_BUF_SIZE];
        int     n = 0;

        struct sockaddr_in f_saddr;
        struct sockaddr_in c_saddr;
        struct hostent  *  hostp;
        struct udp_flow *  flow;
        int                sfd = shim_data(_ipcp)->s_fd;

        irm_msg_t          msg = IRM_MSG__INIT;
        irm_msg_t *        ret_msg ;

        while (true) {
                flow = malloc(sizeof *flow);
                if (flow == NULL)
                        continue;
                n = sizeof c_saddr;
                n = recvfrom(sfd, buf, SHIM_UDP_BUF_SIZE, 0,
                             (struct sockaddr *) &c_saddr, (unsigned *) &n);
                if (n < 0)
                        continue;

                /* flow alloc request from other host */
                hostp = gethostbyaddr((const char *)&c_saddr.sin_addr.s_addr,
                                      sizeof(c_saddr.sin_addr.s_addr), AF_INET);
                if (hostp == NULL)
                        continue;

                /* create a new socket for the server */

                flow->fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
                if (flow->fd == -1) {
                        free(flow);
                        continue;
                }

                memset((char *)&f_saddr, 0, sizeof f_saddr);
                f_saddr.sin_family      = AF_INET;
                f_saddr.sin_addr.s_addr = local_ip;

                /*
                 * FIXME: we could have a port dedicated per registered AP
                 * Not that critical for UDP, but will be for LLC
                 */

                f_saddr.sin_port        = 0;

                /* at least try to get the packet on the wire */
                while (sendto(flow->fd, buf, n, 0,
                              (struct sockaddr *) &c_saddr, sizeof c_saddr) < 0)
                        ;

                /*
                 * store the remote address in the file descriptor
                 * this avoids having to store the sockaddr_in in
                 * the flow structure
                 */

                if (connect(flow->fd,
                            (struct sockaddr *)&c_saddr, sizeof c_saddr) < 0) {
                        close(flow->fd);
                        free(flow);
                        continue;
                }


                /* GERONIMOO */

                msg.code = IRM_MSG_CODE__IPCP_FLOW_REQ_ARR;
                msg.ap_name = "John Day";
                msg.ae_name = ""; /* no AE */
                msg.has_reg_ap_id = true;
                msg.reg_ap_id = ipcp_data_get_reg_ap_id(_ipcp->data, buf);

                ret_msg = send_recv_irm_msg(&msg);
                if (ret_msg == NULL) {
                        LOG_ERR("Could not send message to IRM.");
                        close(flow->fd);
                        free(flow);
                        continue;
                }

                if (!ret_msg->has_port_id) {
                        LOG_ERR("Didn't get port_id.");
                        free(ret_msg);
                        close(flow->fd);
                        free(flow);
                        continue;
                }

                flow->flow.port_id = ret_msg->port_id;
                flow->flow.oflags  = FLOW_O_DEFAULT;
                flow->flow.state   = FLOW_PENDING;

                if(ipcp_data_add_flow(_ipcp->data, (flow_t *) flow)) {
                        LOG_DBGF("Could not add flow.");
                        free(ret_msg);
                        close(flow->fd);
                        free(flow);
                        continue;
                }
        }
}

int ipcp_udp_bootstrap(struct dif_config * conf)
{
        char ipstr[INET_ADDRSTRLEN];
        char dnsstr[INET_ADDRSTRLEN];
        pthread_t handler;

        if (conf->type != THIS_TYPE) {
                LOG_ERR("Config doesn't match IPCP type.");
                return -1;
        }

        if (_ipcp->state != IPCP_INIT) {
                LOG_ERR("IPCP in wrong state.");
                return -1;
        }

        inet_ntop(AF_INET,
                  &conf->ip_addr,
                  ipstr,
                  INET_ADDRSTRLEN);

        if (conf->dns_addr != 0)
                inet_ntop(AF_INET,
                          &conf->dns_addr,
                          dnsstr,
                          INET_ADDRSTRLEN);
        else
                strcpy(dnsstr, "not set");

        shim_data(_ipcp)->ip_addr  = conf->ip_addr;
        shim_data(_ipcp)->dns_addr = conf->dns_addr;

        /* UDP listen server */

        if ((shim_data(_ipcp)->s_fd =
             socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
                LOG_DBGF("Can't create socket.");
                return -1;
        }

        shim_data(_ipcp)->s_saddr.sin_family      = AF_INET;
        shim_data(_ipcp)->s_saddr.sin_addr.s_addr = conf->ip_addr;
        shim_data(_ipcp)->s_saddr.sin_port        = LISTEN_PORT;

        if (bind(shim_data(_ipcp)->s_fd,
                 (struct sockaddr *)&shim_data(_ipcp)->s_saddr,
                 sizeof shim_data(_ipcp)->s_saddr ) < 0) {
                LOG_ERR("Couldn't bind to %s.", ipstr);
                return -1;
        }

        pthread_create(&handler, NULL, ipcp_udp_listener, NULL);

        _ipcp->state = IPCP_ENROLLED;

        LOG_DBG("Bootstrapped shim IPCP over UDP %s-%d.",
                _ipcp->data->iname->name, _ipcp->data->iname->id);

        LOG_DBG("Bound to IP address %s.", ipstr);
        LOG_DBG("DNS server address is %s.", dnsstr);

        return 0;
}

int ipcp_udp_ap_reg(char * ap_name, uint32_t reg_ap_id)
{
        LOG_DBG("Registering local ap %s, %u.", ap_name, reg_ap_id);

        if (_ipcp->state != IPCP_ENROLLED) {
                LOG_DBGF("Won't register with non-enrolled IPCP.");
                return -1;
        }

        if (ipcp_data_add_reg_entry(_ipcp->data, ap_name, reg_ap_id)) {
                LOG_ERR("Failed to add AP to local registry.");
                return -1;
        }

        LOG_MISSING;

        return 0;
}

int ipcp_udp_ap_unreg(uint32_t reg_ap_id)
{
        char * name  = strdup(ipcp_data_get_reg_ap_name(_ipcp->data,
                                                        reg_ap_id));

        ipcp_data_del_reg_entry(_ipcp->data, reg_ap_id);

        /* we are using dns */
        LOG_MISSING;

        free (name);

        return 0;
}

int ipcp_udp_flow_alloc(uint32_t          port_id,
                        char *            dst_ap_name,
                        char *            src_ap_name,
                        char *            src_ae_name,
                        struct qos_spec * qos)
{
        char               buf[SHIM_UDP_BUF_SIZE];
        struct udp_flow *  flow = NULL;
        struct sockaddr_in l_saddr;
        struct sockaddr_in r_saddr;
        int                n;

        irm_msg_t   msg = IRM_MSG__INIT;
        irm_msg_t * ret_msg = NULL;

        if (dst_ap_name == NULL || src_ap_name == NULL || src_ae_name == NULL)
                return -1;

        LOG_DBG("Received flow allocation request from %s to %s.",
                src_ap_name, dst_ap_name);

        if (strlen(dst_ap_name) > 255
            || strlen(src_ap_name) > 255
            || strlen(src_ae_name) > 255) {
                LOG_ERR("Name too long for this shim.");
                return -1;
        }

        if (qos != NULL)
                LOG_DBGF("QoS requested. UDP/IP can't do that.");

        flow = malloc (sizeof *flow);
        if (flow == NULL)
                return -1;

        flow->fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
        if (flow->fd == -1) {
                free(flow);
                return -1;
        }

        /* this socket is for the flow */
        memset((char *)&l_saddr, 0, sizeof l_saddr);
        l_saddr.sin_family      = AF_INET;
        l_saddr.sin_addr.s_addr = local_ip;
        l_saddr.sin_port        = 0;

        if (bind(flow->fd, (struct sockaddr *) &l_saddr, sizeof l_saddr) < 0) {
                char ipstr[INET_ADDRSTRLEN];
                inet_ntop(AF_INET,
                          &l_saddr.sin_addr.s_addr,
                          ipstr,
                          INET_ADDRSTRLEN);
                close(flow->fd);
                free(flow);
                return -1;
        }

        /* get the remote IPv4 address using dns */
        /* FIXME: use calls to specify DDNS server */

#define IP_ADDR 0x7f000001; /* localhost */

        LOG_MISSING;

        memset((char *)&r_saddr, 0, sizeof r_saddr);
        r_saddr.sin_family      = AF_INET;
        /* FIXME: pull in correct IP address */
        r_saddr.sin_addr.s_addr = IP_ADDR; /* FIXME */
        r_saddr.sin_port        = LISTEN_PORT;

        /* at least try to get the packet on the wire */
        while (sendto(flow->fd, dst_ap_name, n, 0,
                      (struct sockaddr *) &r_saddr, sizeof r_saddr) < 0)

        /* wait for the echo from the server */
        /* FIXME: do this in a different thread not to block the entire shim */
        n = sizeof r_saddr;
        n = recvfrom(flow->fd, buf, SHIM_UDP_BUF_SIZE, 0,
                (struct sockaddr *) &r_saddr, (unsigned *) &n);

        flow->flow.port_id = port_id;
        flow->flow.oflags  = FLOW_O_DEFAULT;
        flow->flow.state   = FLOW_ALLOCATED;

        /*
         * store the remote address in the file descriptor
         * this avoids having to store the sockaddr_in in
         * the flow structure
         */

        if (connect(flow->fd,
                    (struct sockaddr *)&r_saddr, sizeof r_saddr) < 0) {
                close(flow->fd);
                free(flow);
                return -1;
        }

        /* add flow to the list */

        pthread_mutex_lock(&_ipcp->data->flow_lock);

        if(ipcp_data_add_flow(_ipcp->data, (flow_t *)flow)) {
                LOG_DBGF("Could not add flow.");
                pthread_mutex_unlock(&_ipcp->data->flow_lock);
                close(flow->fd);
                free(flow);
                return -1;
        }

        pthread_mutex_unlock(&_ipcp->data->flow_lock);

        /* tell IRMd that flow allocation worked */
        /* well,there is no flow allocation */

        msg.code = IRM_MSG_CODE__IPCP_FLOW_ALLOC_REPLY;
        msg.has_port_id = true;
        msg.port_id = flow->flow.port_id;
        msg.has_response = true;
        msg.response = 0;

        ret_msg = send_recv_irm_msg(&msg);
        if (ret_msg == NULL) {
                close (flow->fd);
                ipcp_data_del_flow(_ipcp->data, flow->flow.port_id);
                return -1;
        }

        return flow->fd;
}
int ipcp_udp_flow_alloc_resp(uint32_t port_id,
                             int      response)
{
        struct udp_flow * flow = (struct udp_flow *) ipcp_data_find_flow(
                _ipcp->data, port_id);
        if (flow == NULL) {
                return -1;
        }

        if (response) {
                ipcp_data_del_flow(_ipcp->data, port_id);
                return 0;
        }

        /* awaken pending flow */

        if (flow->flow.state != FLOW_PENDING)
                return -1;

        flow->flow.state = FLOW_ALLOCATED;

        return 0;
}

int ipcp_udp_flow_dealloc(uint32_t port_id)
{
        return 0;
}

int ipcp_udp_du_write(uint32_t port_id,
                      size_t map_index)
{
        return 0;
}

int ipcp_udp_du_read(uint32_t port_id,
                     size_t map_index)
{
        return 0;
}

struct ipcp * ipcp_udp_create(char * ap_name, char * i_id)
{
        struct ipcp * i;
        struct ipcp_udp_data * data;
        struct ipcp_ops *      ops;

        i = malloc(sizeof *i);
        if (i == NULL)
                return NULL;

        data = ipcp_udp_data_create(ap_name, i_id);
        if (data == NULL) {
                free(i);
                return NULL;
        }

        ops = malloc (sizeof *ops);
        if (ops == NULL) {
                free(data);
                free(i);
                return NULL;
        }

        ops->ipcp_bootstrap       = ipcp_udp_bootstrap;
        ops->ipcp_enroll          = NULL;                       /* shim */
        ops->ipcp_reg             = NULL;                       /* shim */
        ops->ipcp_unreg           = NULL;                       /* shim */
        ops->ipcp_ap_reg          = ipcp_udp_ap_reg;
        ops->ipcp_ap_unreg        = ipcp_udp_ap_unreg;
        ops->ipcp_flow_alloc      = ipcp_udp_flow_alloc;
        ops->ipcp_flow_alloc_resp = ipcp_udp_flow_alloc_resp;
        ops->ipcp_flow_dealloc    = ipcp_udp_flow_dealloc;
        ops->ipcp_du_read         = ipcp_udp_du_read;
        ops->ipcp_du_write        = ipcp_udp_du_write;

        i->data = (struct ipcp_data *) data;
        i->ops  = ops;

        i->state = IPCP_INIT;

        return i;
}

#ifndef MAKE_CHECK

int main (int argc, char * argv[])
{
        /* argument 1: pid of irmd ? */
        /* argument 2: ap name */
        /* argument 3: instance id */
        struct sigaction sig_act;

        if (ipcp_arg_check(argc, argv)) {
                LOG_ERR("Wrong arguments.");
                exit(1);
        }

        /* store the process id of the irmd */
        irmd_pid = atoi(argv[1]);

        /* init sig_act */
        memset (&sig_act, 0, sizeof sig_act);

        /* install signal traps */
        sig_act.sa_sigaction = &ipcp_sig_handler;
        sig_act.sa_flags     = SA_SIGINFO;

        sigaction(SIGINT,  &sig_act, NULL);
        sigaction(SIGTERM, &sig_act, NULL);
        sigaction(SIGHUP,  &sig_act, NULL);

        _ipcp = ipcp_udp_create(argv[2], argv[3]);
        if (_ipcp == NULL) {
                LOG_ERR("Won't.");
                exit(1);
        }

        ipcp_main_loop(_ipcp);

        exit(0);
}

#endif /* MAKE_CHECK */