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authorjpeeler <jpeeler@f38db490-d61c-443f-a65b-d21fe96a405b>2010-07-13 19:01:29 +0000
committerjpeeler <jpeeler@f38db490-d61c-443f-a65b-d21fe96a405b>2010-07-13 19:01:29 +0000
commit2540583cc7d4c70b4dc7c2db3886ee822ee1f956 (patch)
treeaf40abec9a519e4e841a946c853bc68317f02dce /apps
parent548d311b7bfddd5ce80fc7f81a2536b9007b5ec6 (diff)
Merged revisions 276074 via svnmerge from
https://origsvn.digium.com/svn/asterisk/trunk ................ r276074 | jpeeler | 2010-07-13 12:37:40 -0500 (Tue, 13 Jul 2010) | 19 lines Merged revisions 275773 via svnmerge from https://origsvn.digium.com/svn/asterisk/branches/1.4 ........ r275773 | jpeeler | 2010-07-12 15:34:51 -0500 (Mon, 12 Jul 2010) | 12 lines Make user removals and traversals thread safe in meetme. Race conditions present in meetme involving the user list where a lack of locking has the potential for a user to be removed during a traversal or as in the case of the reporter after checking if the list is empty could cause a crash. Fixing this was done by convering the userlist to an ao2 container. (closes issue #17390) Reported by: Vince Review: https://reviewboard.asterisk.org/r/746/ ........ ................ git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.6.2@276121 f38db490-d61c-443f-a65b-d21fe96a405b
Diffstat (limited to 'apps')
-rw-r--r--apps/app_meetme.c303
1 files changed, 194 insertions, 109 deletions
diff --git a/apps/app_meetme.c b/apps/app_meetme.c
index c42d19d22..e53bf2997 100644
--- a/apps/app_meetme.c
+++ b/apps/app_meetme.c
@@ -636,7 +636,7 @@ struct ast_conference {
struct ast_frame *transframe[32];
struct ast_frame *origframe;
struct ast_trans_pvt *transpath[32];
- AST_LIST_HEAD_NOLOCK(, ast_conf_user) userlist;
+ struct ao2_container *usercontainer;
AST_LIST_ENTRY(ast_conference) list;
/* announce_thread related data */
pthread_t announcethread;
@@ -1044,6 +1044,30 @@ static void conf_play(struct ast_channel *chan, struct ast_conference *conf, enu
ast_autoservice_stop(chan);
}
+static int user_no_cmp(void *obj, void *arg, int flags)
+{
+ struct ast_conf_user *user = obj;
+ int *user_no = arg;
+
+ if (user->user_no == *user_no) {
+ return (CMP_MATCH | CMP_STOP);
+ }
+
+ return 0;
+}
+
+static int user_max_cmp(void *obj, void *arg, int flags)
+{
+ struct ast_conf_user *user = obj;
+ int *max_no = arg;
+
+ if (user->user_no > *max_no) {
+ *max_no = user->user_no;
+ }
+
+ return 0;
+}
+
/*!
* \brief Find or create a conference
*
@@ -1075,8 +1099,10 @@ static struct ast_conference *build_conf(char *confno, char *pin, char *pinadmin
goto cnfout;
/* Make a new one */
- if (!(cnf = ast_calloc(1, sizeof(*cnf))))
+ if (!(cnf = ast_calloc(1, sizeof(*cnf))) ||
+ !(cnf->usercontainer = ao2_container_alloc(1, NULL, user_no_cmp))) {
goto cnfout;
+ }
ast_mutex_init(&cnf->playlock);
ast_mutex_init(&cnf->listenlock);
@@ -1191,15 +1217,21 @@ static char *complete_meetmecmd(const char *line, const char *word, int pos, int
}
if (cnf) {
+ struct ao2_iterator user_iter;
+ user_iter = ao2_iterator_init(cnf->usercontainer, 0);
/* Search for the user */
- AST_LIST_TRAVERSE(&cnf->userlist, usr, list) {
+ while((usr = ao2_iterator_next(&user_iter))) {
snprintf(usrno, sizeof(usrno), "%d", usr->user_no);
- if (!strncasecmp(word, usrno, len) && ++which > state)
+ if (!strncasecmp(word, usrno, len) && ++which > state) {
+ ao2_ref(usr, -1);
break;
+ }
+ ao2_ref(usr, -1);
}
+ ao2_iterator_destroy(&user_iter);
+ AST_LIST_UNLOCK(&confs);
+ return usr ? ast_strdup(usrno) : NULL;
}
- AST_LIST_UNLOCK(&confs);
- return usr ? ast_strdup(usrno) : NULL;
}
}
@@ -1286,6 +1318,7 @@ static char *meetme_show_cmd(struct ast_cli_entry *e, int cmd, struct ast_cli_ar
ast_free(cmdline);
return CLI_SUCCESS;
} else if (strcmp(a->argv[1], "list") == 0) {
+ struct ao2_iterator user_iter;
int concise = (a->argc == 4 && (!strcasecmp(a->argv[3], "concise")));
/* List all the users in a conference */
if (AST_LIST_EMPTY(&confs)) {
@@ -1311,7 +1344,8 @@ static char *meetme_show_cmd(struct ast_cli_entry *e, int cmd, struct ast_cli_ar
}
/* Show all the users */
time(&now);
- AST_LIST_TRAVERSE(&cnf->userlist, user, list) {
+ user_iter = ao2_iterator_init(cnf->usercontainer, 0);
+ while((user = ao2_iterator_next(&user_iter))) {
hr = (now - user->jointime) / 3600;
min = ((now - user->jointime) % 3600) / 60;
sec = (now - user->jointime) % 60;
@@ -1338,7 +1372,9 @@ static char *meetme_show_cmd(struct ast_cli_entry *e, int cmd, struct ast_cli_ar
user->adminflags & ADMINFLAG_T_REQUEST ? "1" : "",
user->talking, hr, min, sec);
}
+ ao2_ref(user, -1);
}
+ ao2_iterator_destroy(&user_iter);
if (!concise) {
ast_cli(a->fd, "%d users in that conference.\n", cnf->users);
}
@@ -1699,6 +1735,9 @@ static int conf_free(struct ast_conference *conf)
if (conf->recordingformat) {
ast_free(conf->recordingformat);
}
+ if (conf->usercontainer) {
+ ao2_ref(conf->usercontainer, -1);
+ }
ast_mutex_destroy(&conf->playlock);
ast_mutex_destroy(&conf->listenlock);
ast_mutex_destroy(&conf->recordthreadlock);
@@ -1712,13 +1751,19 @@ static void conf_queue_dtmf(const struct ast_conference *conf,
const struct ast_conf_user *sender, struct ast_frame *f)
{
struct ast_conf_user *user;
+ struct ao2_iterator user_iter;
- AST_LIST_TRAVERSE(&conf->userlist, user, list) {
- if (user == sender)
+ user_iter = ao2_iterator_init(conf->usercontainer, 0);
+ while ((user = ao2_iterator_next(&user_iter))) {
+ if (user == sender) {
+ ao2_ref(user, -1);
continue;
+ }
if (ast_write(user->chan, f) < 0)
ast_log(LOG_WARNING, "Error writing frame to channel %s\n", user->chan->name);
+ ao2_ref(user, -1);
}
+ ao2_iterator_destroy(&user_iter);
}
static void sla_queue_event_full(enum sla_event_type type,
@@ -2052,8 +2097,9 @@ static int conf_run(struct ast_channel *chan, struct ast_conference *conf, int c
int setusercount = 0;
int confsilence = 0, totalsilence = 0;
- if (!(user = ast_calloc(1, sizeof(*user))))
+ if (!(user = ao2_alloc(sizeof(*user), NULL))) {
return ret;
+ }
/* Possible timeout waiting for marked user */
if ((confflags & CONFFLAG_WAITMARKED) &&
@@ -2216,22 +2262,21 @@ static int conf_run(struct ast_channel *chan, struct ast_conference *conf, int c
ast_mutex_lock(&conf->playlock);
- if (AST_LIST_EMPTY(&conf->userlist))
- user->user_no = 1;
- else
- user->user_no = AST_LIST_LAST(&conf->userlist)->user_no + 1;
-
- if (rt_schedule && conf->maxusers)
+ if (rt_schedule && conf->maxusers) {
if (conf->users >= conf->maxusers) {
/* Sorry, but this confernce has reached the participant limit! */
if (!ast_streamfile(chan, "conf-full", chan->language))
ast_waitstream(chan, "");
ast_mutex_unlock(&conf->playlock);
- user->user_no = 0;
goto outrun;
}
+ }
- AST_LIST_INSERT_TAIL(&conf->userlist, user, list);
+ ao2_lock(conf->usercontainer);
+ ao2_callback(conf->usercontainer, OBJ_NODATA, user_max_cmp, &user->user_no);
+ user->user_no++;
+ ao2_link(conf->usercontainer, user);
+ ao2_unlock(conf->usercontainer);
user->chan = chan;
user->userflags = confflags;
@@ -2996,17 +3041,21 @@ static int conf_run(struct ast_channel *chan, struct ast_conference *conf, int c
}
break;
case '3': /* Eject last user */
+ {
+ int max_no = 0;
menu_active = 0;
- usr = AST_LIST_LAST(&conf->userlist);
- if ((usr->chan->name == chan->name) || (usr->userflags & CONFFLAG_ADMIN)) {
- if (!ast_streamfile(chan, "conf-errormenu", chan->language)) {
+ ao2_callback(conf->usercontainer, OBJ_NODATA, user_max_cmp, &max_no);
+ usr = ao2_find(conf->usercontainer, &max_no, 0);
+ if ((usr->chan->name == chan->name)||(usr->userflags & CONFFLAG_ADMIN)) {
+ if(!ast_streamfile(chan, "conf-errormenu", chan->language))
ast_waitstream(chan, "");
- }
} else {
usr->adminflags |= ADMINFLAG_KICKME;
}
+ ao2_ref(user, -1);
ast_stopstream(chan);
- break;
+ break;
+ }
case '4':
tweak_listen_volume(user, VOL_DOWN);
break;
@@ -3325,7 +3374,9 @@ bailoutandtrynormal:
ast_dsp_free(dsp);
}
- if (user->user_no) { /* Only cleanup users who really joined! */
+ if (!user->user_no) {
+ ao2_ref(user, -1);
+ } else { /* Only cleanup users who really joined! */
now = ast_tvnow();
hr = (now.tv_sec - user->jointime) / 3600;
min = ((now.tv_sec - user->jointime) % 3600) / 60;
@@ -3362,8 +3413,8 @@ bailoutandtrynormal:
conf->markedusers--;
}
}
- /* Remove ourselves from the list */
- AST_LIST_REMOVE(&conf->userlist, user, list);
+ /* Remove ourselves from the container */
+ ao2_unlink(conf->usercontainer, user);
/* Change any states */
if (!conf->users) {
@@ -3379,7 +3430,6 @@ bailoutandtrynormal:
pbx_builtin_setvar_helper(chan, "MEETMEBOOKID", conf->bookid);
}
}
- ast_free(user);
AST_LIST_UNLOCK(&confs);
return ret;
@@ -3980,14 +4030,83 @@ static struct ast_conf_user *find_user(struct ast_conference *conf, char *caller
sscanf(callerident, "%30i", &cid);
if (conf && callerident) {
- AST_LIST_TRAVERSE(&conf->userlist, user, list) {
- if (cid == user->user_no)
- return user;
- }
+ user = ao2_find(conf->usercontainer, &cid, 0);
+ /* reference decremented later in admin_exec */
+ return user;
}
return NULL;
}
+static int user_set_kickme_cb(void *obj, void *unused, int flags)
+{
+ struct ast_conf_user *user = obj;
+ user->adminflags |= ADMINFLAG_KICKME;
+ return 0;
+}
+
+static int user_set_muted_cb(void *obj, void *unused, int flags)
+{
+ struct ast_conf_user *user = obj;
+ if (!(user->userflags & CONFFLAG_ADMIN)) {
+ user->adminflags |= ADMINFLAG_MUTED;
+ }
+ return 0;
+}
+
+static int user_set_unmuted_cb(void *obj, void *unused, int flags)
+{
+ struct ast_conf_user *user = obj;
+ user->adminflags &= ~(ADMINFLAG_MUTED | ADMINFLAG_SELFMUTED);
+ return 0;
+}
+
+static int user_listen_volup_cb(void *obj, void *unused, int flags)
+{
+ struct ast_conf_user *user = obj;
+ tweak_listen_volume(user, VOL_UP);
+ return 0;
+}
+
+static int user_listen_voldown_cb(void *obj, void *unused, int flags)
+{
+ struct ast_conf_user *user = obj;
+ tweak_listen_volume(user, VOL_DOWN);
+ return 0;
+}
+
+static int user_talk_volup_cb(void *obj, void *unused, int flags)
+{
+ struct ast_conf_user *user = obj;
+ tweak_talk_volume(user, VOL_UP);
+ return 0;
+}
+
+static int user_talk_voldown_cb(void *obj, void *unused, int flags)
+{
+ struct ast_conf_user *user = obj;
+ tweak_talk_volume(user, VOL_DOWN);
+ return 0;
+}
+
+static int user_reset_vol_cb(void *obj, void *unused, int flags)
+{
+ struct ast_conf_user *user = obj;
+ reset_volumes(user);
+ return 0;
+}
+
+static int user_chan_cb(void *obj, void *args, int flags)
+{
+ struct ast_conf_user *user = obj;
+ const char *channel = args;
+
+ if (!strcmp(user->chan->name, channel)) {
+ return (CMP_MATCH | CMP_STOP);
+ }
+
+ return 0;
+}
+
/*! \brief The MeetMeadmin application */
/* MeetMeAdmin(confno, command, caller) */
static int admin_exec(struct ast_channel *chan, void *data) {
@@ -4031,8 +4150,14 @@ static int admin_exec(struct ast_channel *chan, void *data) {
ast_atomic_fetchadd_int(&cnf->refcount, 1);
- if (args.user)
+ if (args.user) {
user = find_user(cnf, args.user);
+ if (!user) {
+ ast_log(LOG_NOTICE, "Specified User not found!\n");
+ res = -2;
+ goto usernotfound;
+ }
+ }
switch (*args.command) {
case 76: /* L: Lock */
@@ -4042,18 +4167,22 @@ static int admin_exec(struct ast_channel *chan, void *data) {
cnf->locked = 0;
break;
case 75: /* K: kick all users */
- AST_LIST_TRAVERSE(&cnf->userlist, user, list)
- user->adminflags |= ADMINFLAG_KICKME;
+ ao2_callback(cnf->usercontainer, OBJ_NODATA, user_set_kickme_cb, NULL);
break;
case 101: /* e: Eject last user*/
- user = AST_LIST_LAST(&cnf->userlist);
+ {
+ int max_no = 0;
+ ao2_callback(cnf->usercontainer, OBJ_NODATA, user_max_cmp, &max_no);
+ user = ao2_find(cnf->usercontainer, &max_no, 0);
if (!(user->userflags & CONFFLAG_ADMIN))
user->adminflags |= ADMINFLAG_KICKME;
else {
res = -1;
ast_log(LOG_NOTICE, "Not kicking last user, is an Admin!\n");
}
+ ao2_ref(user, -1);
break;
+ }
case 77: /* M: Mute */
if (user) {
user->adminflags |= ADMINFLAG_MUTED;
@@ -4063,97 +4192,46 @@ static int admin_exec(struct ast_channel *chan, void *data) {
}
break;
case 78: /* N: Mute all (non-admin) users */
- AST_LIST_TRAVERSE(&cnf->userlist, user, list) {
- if (!(user->userflags & CONFFLAG_ADMIN)) {
- user->adminflags |= ADMINFLAG_MUTED;
- }
- }
+ ao2_callback(cnf->usercontainer, OBJ_NODATA, user_set_muted_cb, NULL);
break;
case 109: /* m: Unmute */
- if (user) {
- user->adminflags &= ~(ADMINFLAG_MUTED | ADMINFLAG_SELFMUTED | ADMINFLAG_T_REQUEST);
- } else {
- res = -2;
- ast_log(LOG_NOTICE, "Specified User not found!\n");
- }
+ user->adminflags &= ~(ADMINFLAG_MUTED | ADMINFLAG_SELFMUTED | ADMINFLAG_T_REQUEST);
break;
case 110: /* n: Unmute all users */
- AST_LIST_TRAVERSE(&cnf->userlist, user, list) {
- user->adminflags &= ~(ADMINFLAG_MUTED | ADMINFLAG_SELFMUTED | ADMINFLAG_T_REQUEST);
- }
+ ao2_callback(cnf->usercontainer, OBJ_NODATA, user_set_unmuted_cb, NULL);
break;
case 107: /* k: Kick user */
- if (user) {
- user->adminflags |= ADMINFLAG_KICKME;
- } else {
- res = -2;
- ast_log(LOG_NOTICE, "Specified User not found!\n");
- }
+ user->adminflags |= ADMINFLAG_KICKME;
break;
case 118: /* v: Lower all users listen volume */
- AST_LIST_TRAVERSE(&cnf->userlist, user, list) {
- tweak_listen_volume(user, VOL_DOWN);
- }
+ ao2_callback(cnf->usercontainer, OBJ_NODATA, user_listen_voldown_cb, NULL);
break;
case 86: /* V: Raise all users listen volume */
- AST_LIST_TRAVERSE(&cnf->userlist, user, list) {
- tweak_listen_volume(user, VOL_UP);
- }
+ ao2_callback(cnf->usercontainer, OBJ_NODATA, user_listen_volup_cb, NULL);
break;
case 115: /* s: Lower all users speaking volume */
- AST_LIST_TRAVERSE(&cnf->userlist, user, list) {
- tweak_talk_volume(user, VOL_DOWN);
- }
+ ao2_callback(cnf->usercontainer, OBJ_NODATA, user_talk_voldown_cb, NULL);
break;
case 83: /* S: Raise all users speaking volume */
- AST_LIST_TRAVERSE(&cnf->userlist, user, list) {
- tweak_talk_volume(user, VOL_UP);
- }
+ ao2_callback(cnf->usercontainer, OBJ_NODATA, user_talk_volup_cb, NULL);
break;
case 82: /* R: Reset all volume levels */
- AST_LIST_TRAVERSE(&cnf->userlist, user, list) {
- reset_volumes(user);
- }
+ ao2_callback(cnf->usercontainer, OBJ_NODATA, user_reset_vol_cb, NULL);
break;
case 114: /* r: Reset user's volume level */
- if (user) {
- reset_volumes(user);
- } else {
- res = -2;
- ast_log(LOG_NOTICE, "Specified User not found!\n");
- }
+ reset_volumes(user);
break;
case 85: /* U: Raise user's listen volume */
- if (user) {
- tweak_listen_volume(user, VOL_UP);
- } else {
- res = -2;
- ast_log(LOG_NOTICE, "Specified User not found!\n");
- }
+ tweak_listen_volume(user, VOL_UP);
break;
case 117: /* u: Lower user's listen volume */
- if (user) {
- tweak_listen_volume(user, VOL_DOWN);
- } else {
- res = -2;
- ast_log(LOG_NOTICE, "Specified User not found!\n");
- }
+ tweak_listen_volume(user, VOL_DOWN);
break;
case 84: /* T: Raise user's talk volume */
- if (user) {
- tweak_talk_volume(user, VOL_UP);
- } else {
- res = -2;
- ast_log(LOG_NOTICE, "Specified User not found!\n");
- }
+ tweak_talk_volume(user, VOL_UP);
break;
case 116: /* t: Lower user's talk volume */
- if (user) {
- tweak_talk_volume(user, VOL_DOWN);
- } else {
- res = -2;
- ast_log(LOG_NOTICE, "Specified User not found!\n");
- }
+ tweak_talk_volume(user, VOL_DOWN);
break;
case 'E': /* E: Extend conference */
if (rt_extend_conf(args.confno)) {
@@ -4162,6 +4240,11 @@ static int admin_exec(struct ast_channel *chan, void *data) {
break;
}
+ if (args.user) {
+ /* decrement reference from find_user */
+ ao2_ref(user, -1);
+ }
+usernotfound:
AST_LIST_UNLOCK(&confs);
dispose_conf(cnf);
@@ -4201,9 +4284,8 @@ static int channel_admin_exec(struct ast_channel *chan, void *data) {
AST_LIST_LOCK(&confs);
AST_LIST_TRAVERSE(&confs, conf, list) {
- AST_LIST_TRAVERSE(&conf->userlist, user, list) {
- if (!strcmp(user->chan->name, args.channel))
- break;
+ if ((user = ao2_callback(conf->usercontainer, 0, user_chan_cb, args.channel))) {
+ break;
}
}
@@ -4228,7 +4310,7 @@ static int channel_admin_exec(struct ast_channel *chan, void *data) {
ast_log(LOG_WARNING, "Unknown MeetMeChannelAdmin command '%s'\n", args.command);
break;
}
-
+ ao2_ref(user, -1);
AST_LIST_UNLOCK(&confs);
return 0;
@@ -4272,9 +4354,7 @@ static int meetmemute(struct mansession *s, const struct message *m, int mute)
return 0;
}
- AST_LIST_TRAVERSE(&conf->userlist, user, list)
- if (user->user_no == userno)
- break;
+ user = ao2_find(conf->usercontainer, &userno, 0);
if (!user) {
AST_LIST_UNLOCK(&confs);
@@ -4291,6 +4371,7 @@ static int meetmemute(struct mansession *s, const struct message *m, int mute)
ast_log(LOG_NOTICE, "Requested to %smute conf %s user %d userchan %s uniqueid %s\n", mute ? "" : "un", conf->confno, user->user_no, user->chan->name, user->chan->uniqueid);
+ ao2_ref(user, -1);
astman_send_ack(s, m, mute ? "User muted" : "User unmuted");
return 0;
}
@@ -4320,6 +4401,7 @@ static int action_meetmelist(struct mansession *s, const struct message *m)
char idText[80] = "";
struct ast_conference *cnf;
struct ast_conf_user *user;
+ struct ao2_iterator user_iter;
int total = 0;
if (!ast_strlen_zero(actionid))
@@ -4335,12 +4417,13 @@ static int action_meetmelist(struct mansession *s, const struct message *m)
/* Find the right conference */
AST_LIST_LOCK(&confs);
AST_LIST_TRAVERSE(&confs, cnf, list) {
+ user_iter = ao2_iterator_init(cnf->usercontainer, 0);
/* If we ask for one particular, and this isn't it, skip it */
if (!ast_strlen_zero(conference) && strcmp(cnf->confno, conference))
continue;
/* Show all the users */
- AST_LIST_TRAVERSE(&cnf->userlist, user, list) {
+ while ((user = ao2_iterator_next(&user_iter))) {
total++;
astman_append(s,
"Event: MeetmeList\r\n"
@@ -4366,8 +4449,10 @@ static int action_meetmelist(struct mansession *s, const struct message *m)
user->userflags & CONFFLAG_MONITOR ? "Listen only" : user->userflags & CONFFLAG_TALKER ? "Talk only" : "Talk and listen",
user->userflags & CONFFLAG_MARKEDUSER ? "Yes" : "No",
user->adminflags & ADMINFLAG_MUTED ? "By admin" : user->adminflags & ADMINFLAG_SELFMUTED ? "By self" : "No",
- user->talking > 0 ? "Yes" : user->talking == 0 ? "No" : "Not monitored");
+ user->talking > 0 ? "Yes" : user->talking == 0 ? "No" : "Not monitored");
+ ao2_ref(user, -1);
}
+ ao2_iterator_destroy(&user_iter);
}
AST_LIST_UNLOCK(&confs);
/* Send final confirmation */