Fix crash in PresenceState AMI action when specifying an invalid provider

This patch fixes a crash in Asterisk that could be caused by using the
PresenceState AMI action while providing an invalid provider. This patch
also adds some additional warnings when a user attempts to provide the
PresenceState action with invalid data, and removes some NOTICE statements
that were still lurking in the code from testing.

(closes issue AST-1084)
Reported by: John Bigelow
Tested by: John Bigelow
........

Merged revisions 381594 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@381595 65c4cc65-6c06-0410-ace0-fbb531ad65f3

funcs/func_presencestate.c

@@ -243,7 +243,7 @@ static enum ast_presence_state custom_presence_callback(const char *data, char *
 	ast_db_get(astdb_family, data, buf, sizeof(buf));
 
 	if (parse_data(buf, &state, &_subtype, &_message, &_options)) {
-		return -1;
+		return AST_PRESENCE_INVALID;
 	}
 
 	if ((strchr(_options, 'e'))) {
@@ -252,7 +252,6 @@ static enum ast_presence_state custom_presence_callback(const char *data, char *
 			*subtype = NULL;
 		} else {
 			memset(tmp, 0, sizeof(tmp));
-			ast_log(LOG_NOTICE, "Hey there, I'm doing some base64 decoding\n");
 			ast_base64decode((unsigned char *) tmp, _subtype, sizeof(tmp) - 1);
 			*subtype = ast_strdup(tmp);
 		}
@@ -261,12 +260,10 @@ static enum ast_presence_state custom_presence_callback(const char *data, char *
 			*message = NULL;
 		} else {
 			memset(tmp, 0, sizeof(tmp));
-			ast_log(LOG_NOTICE, "Hey there, I'm doing some more base64 decoding\n");
 			ast_base64decode((unsigned char *) tmp, _message, sizeof(tmp) - 1);
 			*message = ast_strdup(tmp);
 		}
 	} else {
-		ast_log(LOG_NOTICE, "Not doing any base64 decoding\n");
 		*subtype = ast_strlen_zero(_subtype) ? NULL : ast_strdup(_subtype);
 		*message = ast_strlen_zero(_message) ? NULL : ast_strdup(_message);
 	}

main/manager.c

@@ -2280,6 +2280,7 @@ void astman_send_error_va(struct mansession *s, const struct message *m, const c
 {
 	va_list ap;
 	struct ast_str *buf;
+	char *msg;
 
 	if (!(buf = ast_str_thread_get(&astman_append_buf, ASTMAN_APPEND_BUF_INITSIZE))) {
 		return;
@@ -2289,8 +2290,13 @@ void astman_send_error_va(struct mansession *s, const struct message *m, const c
 	ast_str_set_va(&buf, 0, fmt, ap);
 	va_end(ap);
 
-	astman_send_response_full(s, m, "Error", ast_str_buffer(buf), NULL);
-	ast_free(buf);
+	/* astman_append will use the same underlying buffer, so copy the message out
+	 * before sending the response */
+	msg = ast_str_buffer(buf);
+	if (msg) {
+		msg = ast_strdupa(msg);
+	}
+	astman_send_response_full(s, m, "Error", msg, NULL);
 }
 
 void astman_send_ack(struct mansession *s, const struct message *m, char *msg)
@@ -3378,7 +3384,7 @@ static int action_hangup(struct mansession *s, const struct message *m)
 
 	/* if regex compilation fails, hangup fails */
 	if (regcomp(&regexbuf, ast_str_buffer(regex_string), REG_EXTENDED | REG_NOSUB)) {
-		astman_send_error_va(s, m, "Regex compile failed on: %s\n", name_or_regex);
+		astman_send_error_va(s, m, "Regex compile failed on: %s", name_or_regex);
 		ast_free(regex_string);
 		return 0;
 	}
@@ -4610,6 +4616,10 @@ static int action_presencestate(struct mansession *s, const struct message *m)
 	}
 
 	state = ast_presence_state(provider, &subtype, &message);
+	if (state == AST_PRESENCE_INVALID) {
+		astman_send_error_va(s, m, "Invalid provider %s or provider in invalid state", provider);
+		return 0;
+	}
 
 	if (!ast_strlen_zero(subtype)) {
 		snprintf(subtype_header, sizeof(subtype_header),

main/presencestate.c

@@ -159,6 +159,9 @@ static enum ast_presence_state ast_presence_state_helper(const char *presence_pr
 	}
 	AST_RWLIST_UNLOCK(&presence_state_providers);
 
+	if (!provider) {
+		ast_log(LOG_WARNING, "No provider found for label %s\n", label);
+	}
 
 	return res;
 }