summaryrefslogtreecommitdiff
path: root/src/ipcpd/ipcp.c
blob: 24d8da468819d7d438c495b3909129e6794c27f7 (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
/*
 * Ouroboros - Copyright (C) 2016 - 2017
 *
 * IPC process main loop
 *
 *    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 version 2 as
 * published by the Free Software Foundation.
 *
 * 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.
 */

#define OUROBOROS_PREFIX "ipcpd/ipcp"

#include <ouroboros/config.h>
#include <ouroboros/logs.h>
#include <ouroboros/time_utils.h>
#include <ouroboros/utils.h>
#include <ouroboros/sockets.h>
#include <ouroboros/errno.h>
#include <ouroboros/dev.h>
#include <ouroboros/np1_flow.h>

#include "ipcp.h"

#include <string.h>
#include <sys/socket.h>
#include <stdlib.h>

static void * ipcp_main_loop(void * o)
{
        int     lsockfd;
        uint8_t buf[IPCP_MSG_BUF_SIZE];

        ipcp_msg_t * msg;
        ssize_t      count;
        buffer_t     buffer;
        ipcp_msg_t   ret_msg = IPCP_MSG__INIT;

        dif_config_msg_t * conf_msg;
        struct dif_config  conf;

        struct timeval ltv = {(SOCKET_TIMEOUT / 1000),
                             (SOCKET_TIMEOUT % 1000) * 1000};

        (void) o;

        while (true) {
#ifdef __FreeBSD__
                fd_set fds;
                struct timeval timeout = {(IPCP_ACCEPT_TIMEOUT / 1000),
                                          (IPCP_ACCEPT_TIMEOUT % 1000) * 1000};
#endif
                int fd = -1;

                pthread_rwlock_rdlock(&ipcpi.state_lock);

                if (ipcp_get_state() == IPCP_SHUTDOWN
                    || ipcp_get_state() == IPCP_NULL) {
                        pthread_rwlock_unlock(&ipcpi.state_lock);
                        break;
                }

                pthread_rwlock_unlock(&ipcpi.state_lock);

                ret_msg.code = IPCP_MSG_CODE__IPCP_REPLY;
#ifdef __FreeBSD__
                FD_ZERO(&fds);
                FD_SET(ipcpi.sockfd, &fds);
                if (select(ipcpi.sockfd, &fds, NULL, NULL, &timeout) <= 0)
                        continue;
#endif
                lsockfd = accept(ipcpi.sockfd, 0, 0);
                if (lsockfd < 0)
                        continue;

                if (setsockopt(lsockfd, SOL_SOCKET, SO_RCVTIMEO,
                               (void *) &ltv, sizeof(ltv)))
                        log_warn("Failed to set timeout on socket.");

                count = read(lsockfd, buf, IPCP_MSG_BUF_SIZE);
                if (count <= 0) {
                        log_err("Failed to read from socket");
                        close(lsockfd);
                        continue;
                }

                msg = ipcp_msg__unpack(NULL, count, buf);
                if (msg == NULL) {
                        close(lsockfd);
                        continue;
                }

                switch (msg->code) {
                case IPCP_MSG_CODE__IPCP_BOOTSTRAP:
                        if (ipcpi.ops->ipcp_bootstrap == NULL) {
                                log_err("Bootstrap unsupported.");
                                break;
                        }
                        conf_msg = msg->conf;
                        conf.type = conf_msg->ipcp_type;
                        conf.dif_name = conf_msg->dif_name;
                        if (conf.dif_name == NULL) {
                                ret_msg.has_result = true;
                                ret_msg.result = -1;
                                break;
                        }
                        if (conf_msg->ipcp_type == IPCP_NORMAL) {
                                conf.addr_size = conf_msg->addr_size;
                                conf.cep_id_size = conf_msg->cep_id_size;
                                conf.pdu_length_size =
                                        conf_msg->pdu_length_size;
                                conf.seqno_size = conf_msg->seqno_size;
                                conf.has_ttl = conf_msg->has_ttl;
                                conf.has_chk = conf_msg->has_chk;
                                conf.min_pdu_size = conf_msg->min_pdu_size;
                                conf.max_pdu_size = conf_msg->max_pdu_size;
                                conf.addr_auth_type = conf_msg->addr_auth_type;
                                conf.dt_gam_type = conf_msg->dt_gam_type;
                                conf.rm_gam_type = conf_msg->rm_gam_type;
                        }
                        if (conf_msg->ipcp_type == IPCP_SHIM_UDP) {
                                conf.ip_addr  = conf_msg->ip_addr;
                                conf.dns_addr = conf_msg->dns_addr;
                        }
                        if (conf_msg->ipcp_type == IPCP_SHIM_ETH_LLC)
                                conf.if_name = conf_msg->if_name;

                        ret_msg.has_result = true;
                        ret_msg.result = ipcpi.ops->ipcp_bootstrap(&conf);
                        break;
                case IPCP_MSG_CODE__IPCP_ENROLL:
                        if (ipcpi.ops->ipcp_enroll == NULL) {
                                log_err("Enroll unsupported.");
                                break;
                        }
                        ret_msg.has_result = true;
                        ret_msg.result = ipcpi.ops->ipcp_enroll(msg->dif_name);

                        break;
                case IPCP_MSG_CODE__IPCP_NAME_REG:
                        if (ipcpi.ops->ipcp_name_reg == NULL) {
                                log_err("Ap_reg unsupported.");
                                break;
                        }
                        ret_msg.has_result = true;
                        ret_msg.result =
                                ipcpi.ops->ipcp_name_reg(msg->name);
                        break;
                case IPCP_MSG_CODE__IPCP_NAME_UNREG:
                        if (ipcpi.ops->ipcp_name_unreg == NULL) {
                                log_err("Ap_unreg unsupported.");
                                break;
                        }
                        ret_msg.has_result = true;
                        ret_msg.result =
                                ipcpi.ops->ipcp_name_unreg(msg->name);
                        break;
                case IPCP_MSG_CODE__IPCP_NAME_QUERY:
                        if (ipcpi.ops->ipcp_name_query == NULL) {
                                log_err("Ap_query unsupported.");
                                break;
                        }
                        ret_msg.has_result = true;
                        ret_msg.result =
                                ipcpi.ops->ipcp_name_query(msg->name);
                        break;
                case IPCP_MSG_CODE__IPCP_FLOW_ALLOC:
                        if (ipcpi.ops->ipcp_flow_alloc == NULL) {
                                log_err("Flow_alloc unsupported.");
                                break;
                        }
                        fd = np1_flow_alloc(msg->api, msg->port_id);
                        if (fd < 0) {
                                log_err("Failed allocating fd on port_id %d.",
                                        msg->port_id);
                                ret_msg.has_result = true;
                                ret_msg.result = -1;
                                break;
                        }

                        ret_msg.has_result = true;
                        ret_msg.result =
                                ipcpi.ops->ipcp_flow_alloc(fd,
                                                           msg->dst_name,
                                                           msg->src_ae_name,
                                                           msg->qoscube);
                        break;
                case IPCP_MSG_CODE__IPCP_FLOW_ALLOC_RESP:
                        if (ipcpi.ops->ipcp_flow_alloc_resp == NULL) {
                                log_err("Flow_alloc_resp unsupported.");
                                break;
                        }

                        if (!msg->response) {
                                fd = np1_flow_resp(msg->port_id);
                                if (fd < 0) {
                                        log_warn("Port_id %d is not known.",
                                                 msg->port_id);
                                        ret_msg.has_result = true;
                                        ret_msg.result = -1;
                                        break;
                                }
                        }
                        ret_msg.has_result = true;
                        ret_msg.result =
                                ipcpi.ops->ipcp_flow_alloc_resp(fd,
                                                                msg->response);
                        break;
                case IPCP_MSG_CODE__IPCP_FLOW_DEALLOC:
                        if (ipcpi.ops->ipcp_flow_dealloc == NULL) {
                                log_err("Flow_dealloc unsupported.");
                                break;
                        }

                        fd = np1_flow_dealloc(msg->port_id);
                        if (fd < 0) {
                                log_warn("Could not deallocate port_id %d.",
                                        msg->port_id);
                                ret_msg.has_result = true;
                                ret_msg.result = -1;
                                break;
                        }

                        ret_msg.has_result = true;
                        ret_msg.result =
                                ipcpi.ops->ipcp_flow_dealloc(fd);
                        break;
                default:
                        log_err("Don't know that message code");
                        break;
                }

                ipcp_msg__free_unpacked(msg, NULL);

                buffer.len = ipcp_msg__get_packed_size(&ret_msg);
                if (buffer.len == 0) {
                        log_err("Failed to send reply message");
                        close(lsockfd);
                        continue;
                }

                buffer.data = malloc(buffer.len);
                if (buffer.data == NULL) {
                        close(lsockfd);
                        continue;
                }

                ipcp_msg__pack(&ret_msg, buffer.data);

                if (write(lsockfd, buffer.data, buffer.len) == -1) {
                        free(buffer.data);
                        close(lsockfd);
                        continue;
                }

                free(buffer.data);
                close(lsockfd);
        }

        return (void *) 0;
}

static int parse_args(int    argc,
                      char * argv[],
                      bool * log)
{
        *log = false;

        if (!(argc == 4 || argc == 3))
                return -1;

        /* argument 1: api of irmd */
        if (atoi(argv[1]) == 0)
                return -1;

        ipcpi.irmd_api = atoi(argv[1]);

        /* argument 2: IPCP name */
        ipcpi.name = argv[2];

        /* argument 3: syslog */
        if (argv[3] != NULL)
                *log = true;

        return 0;
}

int ipcp_init(int               argc,
              char **           argv,
              enum ipcp_type    type,
              struct ipcp_ops * ops)
{
        bool log;
        pthread_condattr_t cattr;

        struct timeval tv = {(IPCP_ACCEPT_TIMEOUT / 1000),
                             (IPCP_ACCEPT_TIMEOUT % 1000) * 1000};

        if (parse_args(argc, argv, &log))
                return -1;

        log_init(log);

        if (type == IPCP_NORMAL) {
                if (ap_init(argv[0])) {
                        log_err("Failed to init normal IPCP.");
                        return -1;
                }
        } else {
                if (ap_init(NULL)) {
                        log_err("Failed to init shim IPCP.");
                        return -1;
                }
        }

        ipcpi.irmd_fd   = -1;
        ipcpi.state     = IPCP_NULL;
        ipcpi.shim_data = NULL;

        ipcpi.threadpool = malloc(sizeof(pthread_t) * IPCPD_THREADPOOL_SIZE);
        if (ipcpi.threadpool == NULL) {
                return -ENOMEM;
        }

        ipcpi.sock_path = ipcp_sock_path(getpid());
        if (ipcpi.sock_path == NULL) {
                free(ipcpi.threadpool);
                return -1;
        }

        ipcpi.sockfd = server_socket_open(ipcpi.sock_path);
        if (ipcpi.sockfd < 0) {
                log_err("Could not open server socket.");
                free(ipcpi.threadpool);
                free(ipcpi.sock_path);
                return -1;
        }

        if (setsockopt(ipcpi.sockfd, SOL_SOCKET, SO_RCVTIMEO,
                       (void *) &tv, sizeof(tv)))
                log_warn("Failed to set timeout on socket.");

        ipcpi.ops = ops;

        pthread_rwlock_init(&ipcpi.state_lock, NULL);
        pthread_mutex_init(&ipcpi.state_mtx, NULL);
        pthread_condattr_init(&cattr);
#ifndef __APPLE__
        pthread_condattr_setclock(&cattr, PTHREAD_COND_CLOCK);
#endif
        pthread_cond_init(&ipcpi.state_cond, &cattr);

        if (type == IPCP_NORMAL)
                return 0;

        ipcpi.shim_data = shim_data_create();
        if (ipcpi.shim_data == NULL) {
                free(ipcpi.threadpool);
                free(ipcpi.sock_path);
                return -ENOMEM;
        }

        return 0;
}

int ipcp_boot()
{
        int t;

        ipcp_set_state(IPCP_INIT);

        for (t = 0; t < IPCPD_THREADPOOL_SIZE; ++t) {
                if (pthread_create(&ipcpi.threadpool[t], NULL,
                                   ipcp_main_loop, NULL)) {
                        int i;
                        log_err("Failed to create main thread.");
                        ipcp_set_state(IPCP_NULL);
                        for (i = 0; i < t; ++i)
                                pthread_join(ipcpi.threadpool[i], NULL);
                        return -1;
                }
        }

        return 0;
}

void ipcp_shutdown()
{
        int t;
        for (t = 0; t < IPCPD_THREADPOOL_SIZE; ++t)
                pthread_join(ipcpi.threadpool[t], NULL);

        log_info("IPCP %d shutting down. Bye.", getpid());
}

void ipcp_fini()
{
        close(ipcpi.sockfd);
        if (unlink(ipcpi.sock_path))
                log_warn("Could not unlink %s.", ipcpi.sock_path);

        free(ipcpi.sock_path);
        free(ipcpi.threadpool);

        shim_data_destroy(ipcpi.shim_data);

        pthread_cond_destroy(&ipcpi.state_cond);
        pthread_mutex_destroy(&ipcpi.state_mtx);
        pthread_rwlock_destroy(&ipcpi.state_lock);

        log_fini();

        ap_fini();
}

void ipcp_set_state(enum ipcp_state state)
{
        pthread_mutex_lock(&ipcpi.state_mtx);

        ipcpi.state = state;

        pthread_cond_broadcast(&ipcpi.state_cond);
        pthread_mutex_unlock(&ipcpi.state_mtx);
}

enum ipcp_state ipcp_get_state()
{
        enum ipcp_state state;

        pthread_mutex_lock(&ipcpi.state_mtx);

        state = ipcpi.state;

        pthread_mutex_unlock(&ipcpi.state_mtx);

        return state;
}

int ipcp_wait_state(enum ipcp_state         state,
                    const struct timespec * timeout)
{
        struct timespec abstime;
        int ret = 0;

        clock_gettime(PTHREAD_COND_CLOCK, &abstime);
        ts_add(&abstime, timeout, &abstime);

        pthread_mutex_lock(&ipcpi.state_mtx);

        while (ipcpi.state != state
               && ipcpi.state != IPCP_SHUTDOWN
               && ipcpi.state != IPCP_NULL) {
                if (timeout == NULL)
                        ret = -pthread_cond_wait(&ipcpi.state_cond,
                                                 &ipcpi.state_mtx);
                else
                        ret = -pthread_cond_timedwait(&ipcpi.state_cond,
                                                      &ipcpi.state_mtx,
                                                      &abstime);
        }

        pthread_mutex_unlock(&ipcpi.state_mtx);

        return ret;
}