-
Notifications
You must be signed in to change notification settings - Fork 909
/
dlg_req_within.c
543 lines (435 loc) · 15.5 KB
/
dlg_req_within.c
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
/*
* Copyright (C) 2007 Voice System SRL
*
* This file is part of Kamailio, a free SIP server.
*
* Kamailio 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
*
* Kamailio 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <stdlib.h>
#include <string.h>
#include "../../core/dprint.h"
#include "../../core/ut.h"
#include "../../lib/srdb1/db.h"
#include "../../core/dprint.h"
#include "../../core/config.h"
#include "../../core/socket_info.h"
#include "../../modules/tm/dlg.h"
#include "../../modules/tm/tm_load.h"
#include "../../core/counters.h"
#include "../../core/locking.h"
#include "dlg_timer.h"
#include "dlg_hash.h"
#include "dlg_req_within.h"
#include "dlg_db_handler.h"
#include "dlg_ng_stats.h"
#define MAX_FWD_HDR "Max-Forwards: " MAX_FWD CRLF
#define MAX_FWD_HDR_LEN (sizeof(MAX_FWD_HDR) - 1)
extern str dlg_extra_hdrs;
extern int dlg_db_mode;
extern struct dialog_ng_counters_h dialog_ng_cnts_h;
int free_tm_dlg(dlg_t *td) {
if (td) {
if (td->route_set)
free_rr(&td->route_set);
pkg_free(td);
}
return 0;
}
dlg_t * build_dlg_t(struct dlg_cell * cell, int dir) {
dlg_t* td = NULL;
str cseq;
unsigned int loc_seq;
str route_set;
str contact;
struct dlg_cell_out *dlg_out = 0;
struct dlg_entry_out* dlg_entry_out = 0;
/* if trying to send by to callee we need to get the corresponding dlg_out cell */
lock_get(cell->dlg_out_entries_lock);
dlg_entry_out = &cell->dlg_entry_out;
dlg_out = dlg_entry_out->first;
//must be concurrent call - lets choose - TODO - ie. check if there is more
if (!dlg_out) {
LM_ERR("Trying to send BYE for dialog with no callee leg\n");
lock_release(cell->dlg_out_entries_lock);
return NULL;
}
td = (dlg_t*) pkg_malloc(sizeof (dlg_t));
if (!td) {
LM_ERR("out of pkg memory\n");
lock_release(cell->dlg_out_entries_lock);
return NULL;
}
memset(td, 0, sizeof (dlg_t));
if (dir == DLG_CALLER_LEG) {
cseq = cell->first_req_cseq;
route_set = cell->caller_route_set;
contact = cell->caller_contact;
td->rem_uri = cell->from_uri;
td->loc_uri = dlg_out->to_uri;
td->id.rem_tag = cell->from_tag;
td->id.loc_tag = dlg_out->to_tag;
td->send_sock = cell->caller_bind_addr;
} else {
cseq = dlg_out->callee_cseq;
route_set = dlg_out->callee_route_set;
contact = dlg_out->callee_contact;
td->rem_uri = dlg_out->to_uri;
td->loc_uri = cell->from_uri;
td->id.rem_tag = dlg_out->to_tag;
td->id.loc_tag = cell->from_tag;
td->send_sock = dlg_out->callee_bind_addr;
}
if (str2int(&cseq, &loc_seq) != 0) {
LM_ERR("invalid cseq\n");
goto error;
}
/*we don not increase here the cseq as this will be done by TM*/
td->loc_seq.value = loc_seq;
td->loc_seq.is_set = 1;
/*route set*/
if (route_set.s && route_set.len) {
if (parse_rr_body(route_set.s, route_set.len, &td->route_set) != 0) {
LM_ERR("failed to parse route set\n");
goto error;
}
}
if (contact.s == 0 || contact.len == 0) {
LM_ERR("no contact available\n");
goto error;
}
td->id.call_id = cell->callid;
td->rem_target = contact;
td->state = DLG_CONFIRMED;
lock_release(cell->dlg_out_entries_lock);
return td;
error:
lock_release(cell->dlg_out_entries_lock);
free_tm_dlg(td);
return NULL;
}
/*callback function to handle responses to the BYE request */
void bye_reply_cb(struct cell* t, int type, struct tmcb_params* ps) {
struct dlg_cell* dlg;
int event, old_state, new_state, unref, ret;
struct dlg_cell_out *dlg_out = 0;
if (ps->param == NULL || *ps->param == NULL) {
LM_ERR("invalid parameter\n");
return;
}
if (ps->code < 200) {
LM_DBG("receiving a provisional reply\n");
return;
}
LM_DBG("receiving a final reply %d\n", ps->code);
dlg = (struct dlg_cell *) (*(ps->param));
event = DLG_EVENT_REQBYE;
//get the corresponding dlg out structure for this REQ
struct dlg_entry_out *dlg_entry_out = &dlg->dlg_entry_out;
lock_get(dlg->dlg_out_entries_lock);
dlg_out = dlg_entry_out->first; //TODO check for concurrent call
if (!dlg_out)
return;
next_state_dlg(dlg, event, &old_state, &new_state, &unref, &dlg_out->to_tag);
lock_release(dlg->dlg_out_entries_lock);
if (new_state == DLG_STATE_DELETED && old_state != DLG_STATE_DELETED) {
LM_DBG("removing dialog with h_entry %u and h_id %u\n",
dlg->h_entry, dlg->h_id);
/* remove from timer */
ret = remove_dialog_timer(&dlg->tl);
if (ret < 0) {
LM_CRIT("unable to unlink the timer on dlg %p [%u:%u] "
"with clid '%.*s'\n",
dlg, dlg->h_entry, dlg->h_id,
dlg->callid.len, dlg->callid.s);
} else if (ret > 0) {
LM_WARN("inconsistent dlg timer data on dlg %p [%u:%u] "
"with clid '%.*s'\n",
dlg, dlg->h_entry, dlg->h_id,
dlg->callid.len, dlg->callid.s);
} else {
unref++;
}
counter_add(dialog_ng_cnts_h.active, -1);
/* dialog terminated (BYE) */
run_dlg_callbacks(DLGCB_TERMINATED, dlg, ps->req, ps->rpl, DLG_DIR_NONE, 0);
/* derefering the dialog */
unref_dlg(dlg, unref); /*removed the extra +1 on the unref that is usually added in the unref of next_state_dlg */
}
if (new_state == DLG_STATE_DELETED && old_state == DLG_STATE_DELETED) {
/* trash the dialog from DB and memory */
if (dlg_db_mode)
remove_dialog_in_from_db(dlg);
/* force delete from mem */
unref_dlg(dlg, 1);
}
}
static inline int build_extra_hdr(struct dlg_cell * cell, str *extra_hdrs,
str *str_hdr) {
char *p;
str_hdr->len = MAX_FWD_HDR_LEN + dlg_extra_hdrs.len;
if (extra_hdrs && extra_hdrs->len > 0)
str_hdr->len += extra_hdrs->len;
str_hdr->s = (char*) pkg_malloc(str_hdr->len * sizeof (char));
if (!str_hdr->s) {
LM_ERR("out of pkg memory\n");
goto error;
}
memcpy(str_hdr->s, MAX_FWD_HDR, MAX_FWD_HDR_LEN);
p = str_hdr->s + MAX_FWD_HDR_LEN;
if (dlg_extra_hdrs.len) {
memcpy(p, dlg_extra_hdrs.s, dlg_extra_hdrs.len);
p += dlg_extra_hdrs.len;
}
if (extra_hdrs && extra_hdrs->len > 0)
memcpy(p, extra_hdrs->s, extra_hdrs->len);
return 0;
error:
return -1;
}
/* cell- pointer to a struct dlg_cell
* dir- direction: the request will be sent to:
* DLG_CALLER_LEG (0): caller
* DLG_CALLEE_LEG (1): callee
*/
static inline int send_bye(struct dlg_cell * cell, int dir, str *hdrs) {
uac_req_t uac_r;
dlg_t* dialog_info;
str met = {"BYE", 3};
int result;
/* do not send BYE request for non-confirmed dialogs (not supported) */
if (cell->state != DLG_STATE_CONFIRMED) {
LM_ERR("terminating only 1 side of non-confirmed dialogs not supported by this function\n");
return -1;
}
/*verify direction*/
if ((dialog_info = build_dlg_t(cell, dir)) == 0) {
LM_ERR("failed to create dlg_t\n");
goto err;
}
LM_DBG("sending BYE to %s\n", (dir == DLG_CALLER_LEG) ? "caller" : "callee");
ref_dlg(cell, 1);
memset(&uac_r, '\0', sizeof (uac_req_t));
set_uac_req(&uac_r, &met, hdrs, NULL, dialog_info, TMCB_LOCAL_COMPLETED,
bye_reply_cb, (void*) cell);
result = d_tmb.t_request_within(&uac_r);
if (result < 0) {
LM_ERR("failed to send the BYE request\n");
goto err1;
}
free_tm_dlg(dialog_info);
LM_DBG("BYE sent to %s\n", (dir == 0) ? "caller" : "callee");
return 0;
err1:
unref_dlg(cell, 1);
err:
if (dialog_info)
free_tm_dlg(dialog_info);
return -1;
}
/*static void early_transaction_destroyed(struct cell* t, int type, struct tmcb_params *param) {
struct dlg_cell *dlg = (struct dlg_cell *) (*param->param);
if (!dlg)
return;
LM_DBG("Early transaction destroyed\n");
}*/
/* side =
* 0: caller
* 1: callee
* 2: all
*/
int dlg_terminate(struct dlg_cell *dlg, struct sip_msg *msg, str *reason, int side, str *extra_hdrs) {
struct cell* t;
str default_reason = {"call failed", 11};
int cfg_cmd = 0;
str default_extra_headers = {0,0};
if (!dlg) {
LM_ERR("calling end_dialog with NULL pointer dlg\n");
return -1;
}
if (!extra_hdrs)
extra_hdrs = &default_extra_headers;
if (msg) {
//assume called from cfg command -> dlg_terminate, as opposed to internal API or mi interface
cfg_cmd = 1;
}
if (!reason || reason->len <= 0 || !reason->s) {
reason = &default_reason;
}
if (dlg->state != DLG_STATE_CONFIRMED) {
if (side != 2) {
LM_ERR("can't terminate only 1 side of an early dialog\n");
return -1;
}
if (dlg->transaction) {
LM_DBG("terminating early dialog with %d outbound forks on transaction %p\n",
dlg->transaction->nr_of_outgoings, dlg->transaction);
t = dlg->transaction;
if (t && t!=(void*) -1 && t->uas.request) {
if (t->method.len!=6 || t->method.s[0]!='I' || t->method.s[1]!='N' || t->method.s[2]!='V')
{
//well this is the transaction of a subsequent request within the dialog
//and the dialog is not confirmed yet, so its a PRACK or an UPDATE
//could also be an option, but the important thing is how am i going to get
//the transaction of the invite, that is the one i have to cancel
LM_WARN("this is not my transaction so where am i?\n");
return 1; //TODO - need to check why we got in here once before? this crashed on t_reply as t seemed invalid
}
//TODO: here we are assuming none of the CALLEE's have sent a 200, in
//which case we would have to send an ACK, BYE
//so right now - we are sending 488 to caller and CANCEL's to all CALLEEs
LM_DBG("tearing down dialog in EARLY state - no clients responded > 199\n");
if (cfg_cmd) {
d_tmb.t_reply(msg,488,reason->s);
d_tmb.t_release(msg);
} else {
d_tmb.t_reply(t->uas.request,488,reason->s);
d_tmb.t_release(t->uas.request);
}
}
} else {
LM_WARN("can't terminate early dialog without a transaction\n");
return -1;
}
} else {
LM_DBG("terminating confirmed dialog\n");
if (side == DLG_CALLER_LEG /* 0 */ || side == DLG_CALLEE_LEG /* 1 */) {
if (dlg_bye(dlg, (extra_hdrs->len > 0) ? extra_hdrs : NULL, side) < 0)
return -1;
} else {
if (dlg_bye_all(dlg, (extra_hdrs->len > 0) ? extra_hdrs : NULL) < 0)
return -1;
}
}
return 1;
}
#ifdef MI_REMOVED
/*parameters from MI: callid, from tag, to tag*/
/* TODO: add reason parameter to mi interface */
struct mi_root * mi_terminate_dlg(struct mi_root *cmd_tree, void *param) {
struct mi_node* node;
struct dlg_cell * dlg = NULL;
str mi_extra_hdrs = {"Reason: mi_terminated\r\n", 23};
int status, msg_len;
char *msg;
str callid = {NULL, 0};
str ftag = {NULL, 0};
str ttag = {NULL, 0};
str reason = {"mi_terminated", 13};
if (d_table == NULL)
goto end;
node = cmd_tree->node.kids;
if (node == NULL || node->next == NULL || node->next->next == NULL)
return init_mi_tree(400, MI_MISSING_PARM_S, MI_MISSING_PARM_LEN);
if (!node->value.s || !node->value.len) {
goto error;
} else {
callid = node->value;
}
node = node->next;
if (!node->value.s || !node->value.len) {
goto error;
} else {
ftag = node->value;
}
node = node->next;
if (!node->value.s || !node->value.len) {
goto error;
} else {
ttag = node->value;
}
if (node->next) {
node = node->next;
if (node->value.len && node->value.s)
mi_extra_hdrs = node->value;
}
unsigned int dir = DLG_DIR_NONE;
LM_DBG("Looking for callid [%.*s]\n", callid.len, callid.s);
dlg = get_dlg(&callid, &ftag, &ttag, &dir); //increments ref count!
if (dlg) {
LM_DBG("Found dialog to terminate and it is in state [%i] [%.*s]\n", dlg->state, mi_extra_hdrs.len, mi_extra_hdrs.s);
if (dlg_terminate(dlg, 0, &reason/*reson*/, /* all sides of a dialog*/ 2, &mi_extra_hdrs) < 0) {
status = 500;
msg = MI_DLG_OPERATION_ERR;
msg_len = MI_DLG_OPERATION_ERR_LEN;
} else {
status = 200;
msg = MI_OK_S;
msg_len = MI_OK_LEN;
}
unref_dlg(dlg, 1);
return init_mi_tree(status, msg, msg_len);
}
end:
return init_mi_tree(404, MI_DIALOG_NOT_FOUND, MI_DIALOG_NOT_FOUND_LEN);
error:
return init_mi_tree(400, MI_BAD_PARM_S, MI_BAD_PARM_LEN);
}
#endif
int dlg_bye(struct dlg_cell *dlg, str *hdrs, int side) {
str all_hdrs = {0, 0};
int ret;
if (side == DLG_CALLER_LEG) {
if (dlg->dflags & DLG_FLAG_CALLERBYE)
return -1;
dlg->dflags |= DLG_FLAG_CALLERBYE;
} else {
if (dlg->dflags & DLG_FLAG_CALLEEBYE)
return -1;
dlg->dflags |= DLG_FLAG_CALLEEBYE;
}
if ((build_extra_hdr(dlg, hdrs, &all_hdrs)) != 0) {
LM_ERR("failed to build dlg headers\n");
return -1;
}
ret = send_bye(dlg, side, &all_hdrs);
pkg_free(all_hdrs.s);
return ret;
}
/* Wrapper for terminating dialog from API - from other modules */
int w_api_terminate_dlg(str *callid, str *ftag, str *ttag, str *hdrs, str* reason) {
struct dlg_cell *dlg;
unsigned int dir = DLG_DIR_NONE;
dlg = get_dlg(callid, ftag, ttag, &dir); //increments ref count!
if (!dlg) {
LM_ERR("Asked to tear down non existent dialog\n");
return -1;
}
unref_dlg(dlg, 1);
return dlg_terminate(dlg, NULL, reason, 2, hdrs);
}
int dlg_bye_all(struct dlg_cell *dlg, str *hdrs) {
str all_hdrs = {0, 0};
int ret;
if ((build_extra_hdr(dlg, hdrs, &all_hdrs)) != 0) {
LM_ERR("failed to build dlg headers\n");
return -1;
}
ret = send_bye(dlg, DLG_CALLER_LEG, &all_hdrs);
ret |= send_bye(dlg, DLG_CALLEE_LEG, &all_hdrs);
pkg_free(all_hdrs.s);
return ret;
}
/* Wrapper for terminating dialog from API - from other modules */
int w_api_lookup_terminate_dlg(unsigned int h_entry, unsigned int h_id, str *hdrs) {
struct dlg_cell *dlg;
dlg = lookup_dlg(h_entry, h_id); //increments ref count!
if (!dlg) {
LM_ERR("Asked to tear down non existent dialog\n");
return -1;
}
unref_dlg(dlg, 1);
return dlg_terminate(dlg, NULL, NULL/*reason*/, 2, hdrs);
}