logger: Don't store verbose-magic in the log files.

In r399267, the verbose2magic stuff was edited. This time it results
in magic characters in the log files for multiline messages.

In trunk (and 13) this was fixed by the "stripping" of those
characters from multiline messages (in r414798).

This is a backport of that fix to 11. That fix is altered to actually
strip the characters and not replace them with blanks.

Review: https://reviewboard.asterisk.org/r/3901/
Review: https://reviewboard.asterisk.org/r/3902/


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@420897 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/logger.c

@@ -86,7 +86,7 @@ static int display_callids;
 static void unique_callid_cleanup(void *data);
 
 struct ast_callid {
-    int call_identifier; /* Numerical value of the call displayed in the logs */
+	int call_identifier; /* Numerical value of the call displayed in the logs */
 };
 
 AST_THREADSTORAGE_CUSTOM(unique_callid, NULL, unique_callid_cleanup);
@@ -1044,25 +1044,58 @@ static void ast_log_vsyslog(struct logmsg *msg)
 	syslog(syslog_level, "%s", buf);
 }
 
+static char *logger_strip_verbose_magic(const char *message, int level)
+{
+	const char *begin, *end;
+	char *stripped_message, *dst;
+	char magic = -(level + 1);
+
+	if (!(stripped_message = ast_malloc(strlen(message) + 1))) {
+		return NULL;
+	}
+
+	begin = message;
+	dst = stripped_message;
+	do {
+		end = strchr(begin, magic);
+		if (end) {
+			size_t len = end - begin;
+			memcpy(dst, begin, len);
+			begin = end + 1;
+			dst += len;
+		} else {
+			strcpy(dst, begin); /* safe */
+			break;
+		}
+	} while (1);
+
+	return stripped_message;
+}
+
 /*! \brief Print a normal log message to the channels */
 static void logger_print_normal(struct logmsg *logmsg)
 {
 	struct logchannel *chan = NULL;
 	char buf[BUFSIZ];
 	struct verb *v = NULL;
+	char *tmpmsg;
 	int level = 0;
 
 	if (logmsg->level == __LOG_VERBOSE) {
-		char *tmpmsg = ast_strdupa(logmsg->message + 1);
-
-		level = VERBOSE_MAGIC2LEVEL(logmsg->message);
 
 		/* Iterate through the list of verbosers and pass them the log message string */
 		AST_RWLIST_RDLOCK(&verbosers);
 		AST_RWLIST_TRAVERSE(&verbosers, v, list)
 			v->verboser(logmsg->message);
 		AST_RWLIST_UNLOCK(&verbosers);
-		ast_string_field_set(logmsg, message, tmpmsg);
+
+		level = VERBOSE_MAGIC2LEVEL(logmsg->message);
+
+		tmpmsg = logger_strip_verbose_magic(logmsg->message, level);
+		if (tmpmsg) {
+			ast_string_field_set(logmsg, message, tmpmsg);
+			ast_free(tmpmsg);
+		}
 	}
 
 	AST_RWLIST_RDLOCK(&logchannels);