Fix error paths in action_hangup() for AMI Hangup action.

* Check allocation function return values for failure.  Crashing is bad.

* Tweak ast_regex_string_to_regex_pattern() parameters for proper ast_str 
usage.  


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@368714 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/strings.h

@@ -253,19 +253,19 @@ int ast_build_string(char **buffer, size_t *space, const char *fmt, ...) __attri
 int ast_build_string_va(char **buffer, size_t *space, const char *fmt, va_list ap) __attribute__((format(printf, 3, 0)));
 
 /*!
-  \brief Given a string regex_string in the form of "/regex/", convert it into the form of "regex"
-
-  This function will trim one leading / and one trailing / from a given input string
-  ast_str regex_pattern must be preallocated before calling this function
-
-  \return 0 on success, non-zero on failure.
-  \return 1 if we only stripped a leading /
-  \return 2 if we only stripped a trailing /
-  \return 3 if we did not strip any / characters
-  \param regex_string  the string containing /regex/
-  \param regex_pattern the destination ast_str which will contain "regex" after execution
-*/
-int ast_regex_string_to_regex_pattern(const char *regex_string, struct ast_str *regex_pattern);
+ * \brief Given a string regex_string in the form of "/regex/", convert it into the form of "regex"
+ *
+ * This function will trim one leading / and one trailing / from a given input string
+ * ast_str regex_pattern must be preallocated before calling this function
+ *
+ * \return 0 on success, non-zero on failure.
+ * \return 1 if we only stripped a leading /
+ * \return 2 if we only stripped a trailing /
+ * \return 3 if we did not strip any / characters
+ * \param regex_string  the string containing /regex/
+ * \param regex_pattern the destination ast_str which will contain "regex" after execution
+ */
+int ast_regex_string_to_regex_pattern(const char *regex_string, struct ast_str **regex_pattern);
 
 /*!
  * \brief Make sure something is true.

main/manager.c

@@ -3199,7 +3199,7 @@ static int action_hangup(struct mansession *s, const struct message *m)
 	const char *id = astman_get_header(m, "ActionID");
 	const char *name_or_regex = astman_get_header(m, "Channel");
 	const char *cause = astman_get_header(m, "Cause");
-	char idText[256] = "";
+	char idText[256];
 	regex_t regexbuf;
 	struct ast_channel_iterator *iter = NULL;
 	struct ast_str *regex_string;
@@ -3212,6 +3212,8 @@ static int action_hangup(struct mansession *s, const struct message *m)
 
 	if (!ast_strlen_zero(id)) {
 		snprintf(idText, sizeof(idText), "ActionID: %s\r\n", id);
+	} else {
+		idText[0] = '\0';
 	}
 
 	if (!ast_strlen_zero(cause)) {
@@ -3252,9 +3254,13 @@ static int action_hangup(struct mansession *s, const struct message *m)
 	/* find and hangup any channels matching regex */
 
 	regex_string = ast_str_create(strlen(name_or_regex));
+	if (!regex_string) {
+		astman_send_error(s, m, "Memory Allocation Failure");
+		return 0;
+	}
 
 	/* Make "/regex/" into "regex" */
-	if (ast_regex_string_to_regex_pattern(name_or_regex, regex_string) != 0) {
+	if (ast_regex_string_to_regex_pattern(name_or_regex, &regex_string) != 0) {
 		astman_send_error(s, m, "Regex format invalid, Channel param should be /regex/");
 		ast_free(regex_string);
 		return 0;
@@ -3269,31 +3275,31 @@ static int action_hangup(struct mansession *s, const struct message *m)
 
 	astman_send_listack(s, m, "Channels hung up will follow", "start");
 
-	for (iter = ast_channel_iterator_all_new(); iter && (c = ast_channel_iterator_next(iter)); ) {
-		if (regexec(&regexbuf, ast_channel_name(c), 0, NULL, 0)) {
-			ast_channel_unref(c);
-			continue;
-		}
-
-		ast_verb(3, "%sManager '%s' from %s, hanging up channel: %s\n",
-			(s->session->managerid ? "HTTP " : ""),
-			s->session->username,
-			ast_inet_ntoa(s->session->sin.sin_addr),
-			ast_channel_name(c));
+	iter = ast_channel_iterator_all_new();
+	if (iter) {
+		for (; (c = ast_channel_iterator_next(iter)); ast_channel_unref(c)) {
+			if (regexec(&regexbuf, ast_channel_name(c), 0, NULL, 0)) {
+				continue;
+			}
 
-		ast_channel_softhangup_withcause_locked(c, causecode);
-		channels_matched++;
+			ast_verb(3, "%sManager '%s' from %s, hanging up channel: %s\n",
+				(s->session->managerid ? "HTTP " : ""),
+				s->session->username,
+				ast_inet_ntoa(s->session->sin.sin_addr),
+				ast_channel_name(c));
 
-		astman_append(s,
-			"Event: ChannelHungup\r\n"
-			"Channel: %s\r\n"
-			"%s"
-			"\r\n", ast_channel_name(c), idText);
+			ast_channel_softhangup_withcause_locked(c, causecode);
+			channels_matched++;
 
-		ast_channel_unref(c);
+			astman_append(s,
+				"Event: ChannelHungup\r\n"
+				"Channel: %s\r\n"
+				"%s"
+				"\r\n", ast_channel_name(c), idText);
+		}
+		ast_channel_iterator_destroy(iter);
 	}
 
-	ast_channel_iterator_destroy(iter);
 	regfree(&regexbuf);
 	ast_free(regex_string);
 

main/utils.c

@@ -1362,20 +1362,20 @@ int ast_build_string(char **buffer, size_t *space, const char *fmt, ...)
 	return result;
 }
 
-int ast_regex_string_to_regex_pattern(const char *regex_string, struct ast_str *regex_pattern)
+int ast_regex_string_to_regex_pattern(const char *regex_string, struct ast_str **regex_pattern)
 {
 	int regex_len = strlen(regex_string);
 	int ret = 3;
 
 	/* Chop off the leading / if there is one */
 	if ((regex_len >= 1) && (regex_string[0] == '/')) {
-		ast_str_set(&regex_pattern, 0, "%s", regex_string + 1);
+		ast_str_set(regex_pattern, 0, "%s", regex_string + 1);
 		ret -= 2;
 	}
 
 	/* Chop off the ending / if there is one */
 	if ((regex_len > 1) && (regex_string[regex_len - 1] == '/')) {
-		ast_str_truncate(regex_pattern, -1);
+		ast_str_truncate(*regex_pattern, -1);
 		ret -= 1;
 	}