app_confbridge: Fix crash caused when waitmarked/marked users leave together
[asterisk/asterisk.git] / apps / confbridge / conf_state_multi_marked.c
1 /*
2  * Asterisk -- An open source telephony toolkit.
3  *
4  * Copyright (C) 2012, Terry Wilson
5  *
6  * Terry Wilson <twilson@digium.com>
7  *
8  * See http://www.asterisk.org for more information about
9  * the Asterisk project. Please do not directly contact
10  * any of the maintainers of this project for assistance;
11  * the project provides a web site, mailing lists and IRC
12  * channels for your use.
13  *
14  * This program is free software, distributed under the terms of
15  * the GNU General Public License Version 2. See the LICENSE file
16  * at the top of the source tree.
17  *
18  * Please follow coding guidelines
19  * http://svn.digium.com/view/asterisk/trunk/doc/CODING-GUIDELINES
20  */
21
22 /*! \file
23  *
24  * \brief Confbridge state handling for the MULTI_MARKED state
25  *
26  * \author\verbatim Terry Wilson <twilson@digium.com> \endverbatim
27  *
28  * \ingroup applications
29  */
30
31 /*** MODULEINFO
32         <support_level>core</support_level>
33  ***/
34
35 #include "asterisk.h"
36 #include "asterisk/utils.h"
37 #include "asterisk/linkedlists.h"
38 #include "include/confbridge.h"
39 #include "asterisk/musiconhold.h"
40 #include "include/conf_state.h"
41 #include "asterisk/pbx.h"
42
43 static void join_active(struct confbridge_user *user);
44 static void join_marked(struct confbridge_user *user);
45 static void leave_active(struct confbridge_user *user);
46 static void leave_marked(struct confbridge_user *user);
47 static void transition_to_marked(struct confbridge_user *user);
48
49 static struct confbridge_state STATE_MULTI_MARKED = {
50         .name = "MULTI_MARKED",
51         .join_unmarked = join_active,
52         .join_waitmarked = join_active,
53         .join_marked = join_marked,
54         .leave_unmarked = leave_active,
55         .leave_waitmarked = leave_active,
56         .leave_marked = leave_marked,
57         .entry = transition_to_marked,
58 };
59 struct confbridge_state *CONF_STATE_MULTI_MARKED = &STATE_MULTI_MARKED;
60
61 static void join_active(struct confbridge_user *user)
62 {
63         conf_add_user_active(user->conference, user);
64         conf_update_user_mute(user);
65 }
66
67 static void join_marked(struct confbridge_user *user)
68 {
69         conf_add_user_marked(user->conference, user);
70         conf_update_user_mute(user);
71 }
72
73 static void leave_active(struct confbridge_user *user)
74 {
75         conf_remove_user_active(user->conference, user);
76         if (user->conference->activeusers == 1) {
77                 conf_change_state(user, CONF_STATE_SINGLE_MARKED);
78         }
79 }
80
81 static void leave_marked(struct confbridge_user *user)
82 {
83         struct confbridge_user *user_iter;
84         int need_prompt = 0;
85
86         conf_remove_user_marked(user->conference, user);
87
88         if (user->conference->markedusers == 0) {
89                 need_prompt = 1;
90
91                 AST_LIST_TRAVERSE_SAFE_BEGIN(&user->conference->active_list, user_iter, list) {
92                         /* Kick ENDMARKED cbu_iters */
93                         if (ast_test_flag(&user_iter->u_profile, USER_OPT_ENDMARKED) && !user_iter->kicked) {
94                                 if (ast_test_flag(&user_iter->u_profile, USER_OPT_WAITMARKED)
95                                         && !ast_test_flag(&user_iter->u_profile, USER_OPT_MARKEDUSER)) {
96                                         AST_LIST_REMOVE_CURRENT(list);
97                                         user_iter->conference->activeusers--;
98                                         AST_LIST_INSERT_TAIL(&user_iter->conference->waiting_list, user_iter, list);
99                                         user_iter->conference->waitingusers++;
100                                 }
101                                 user_iter->kicked = 1;
102                                 pbx_builtin_setvar_helper(user_iter->chan, "CONFBRIDGE_RESULT", "ENDMARKED");
103                                 ast_bridge_remove(user_iter->conference->bridge, user_iter->chan);
104                         } else if (ast_test_flag(&user_iter->u_profile, USER_OPT_WAITMARKED)
105                                 && !ast_test_flag(&user_iter->u_profile, USER_OPT_MARKEDUSER)) {
106                                 AST_LIST_REMOVE_CURRENT(list);
107                                 user_iter->conference->activeusers--;
108                                 AST_LIST_INSERT_TAIL(&user_iter->conference->waiting_list, user_iter, list);
109                                 user_iter->conference->waitingusers++;
110
111                                 /* Handle moh of user_iter if necessary */
112                                 if (ast_test_flag(&user_iter->u_profile, USER_OPT_MUSICONHOLD)) {
113                                         conf_moh_start(user_iter);
114                                 }
115                                 conf_update_user_mute(user_iter);
116                         }
117                 }
118                 AST_LIST_TRAVERSE_SAFE_END;
119         }
120
121         switch (user->conference->activeusers) {
122         case 0:
123                 /* Implies markedusers == 0 */
124                 switch (user->conference->waitingusers) {
125                 case 0:
126                         conf_change_state(user, CONF_STATE_EMPTY);
127                         break;
128                 default:
129                         conf_change_state(user, CONF_STATE_INACTIVE);
130                         break;
131                 }
132                 break;
133         case 1:
134                 switch (user->conference->markedusers) {
135                 case 0:
136                         conf_change_state(user, CONF_STATE_SINGLE);
137                         break;
138                 case 1:
139                         /* XXX I seem to remember doing this for a reason, but right now it escapes me
140                          * how we could possibly ever have a waiting user while we have a marked user */
141                         switch (user->conference->waitingusers) {
142                         case 0:
143                                 conf_change_state(user, CONF_STATE_SINGLE_MARKED);
144                                 break;
145                         case 1:
146                                 break; /* Stay in marked */
147                         }
148                         break;
149                 }
150                 break;
151         default:
152                 switch (user->conference->markedusers) {
153                 case 0:
154                         conf_change_state(user, CONF_STATE_MULTI);
155                         break;
156                 default:
157                         break; /* Stay in marked */
158                 }
159         }
160
161         if (need_prompt) {
162                 /* Play back the audio prompt saying the leader has left the conference */
163                 if (!ast_test_flag(&user->u_profile, USER_OPT_QUIET)) {
164                         ao2_unlock(user->conference);
165                         ast_autoservice_start(user->chan);
166                         play_sound_file(user->conference,
167                                 conf_get_sound(CONF_SOUND_LEADER_HAS_LEFT, user->b_profile.sounds));
168                         ast_autoservice_stop(user->chan);
169                         ao2_lock(user->conference);
170                 }
171         }
172 }
173
174 static void transition_to_marked(struct confbridge_user *user)
175 {
176         struct confbridge_user *user_iter;
177
178         /* Play the audio file stating they are going to be placed into the conference */
179         if (user->conference->markedusers == 1 && ast_test_flag(&user->u_profile, USER_OPT_MARKEDUSER)) {
180                 conf_handle_first_marked_common(user);
181         }
182
183         /* Move all waiting users to active, stopping MOH and unmuting if necessary */
184         AST_LIST_TRAVERSE_SAFE_BEGIN(&user->conference->waiting_list, user_iter, list) {
185                 AST_LIST_REMOVE_CURRENT(list);
186                 user->conference->waitingusers--;
187                 AST_LIST_INSERT_TAIL(&user->conference->active_list, user_iter, list);
188                 user->conference->activeusers++;
189                 if (user_iter->playing_moh) {
190                         conf_moh_stop(user_iter);
191                 }
192                 conf_update_user_mute(user_iter);
193         }
194         AST_LIST_TRAVERSE_SAFE_END;
195 }