Log to a malloc()ed buffer if the on-stack buffer is not large enough

diff --git a/src/libcharon/bus/bus.c b/src/libcharon/bus/bus.c
index c4932918cc83b982e210474b295d2e198c5c3575..e46559f9787642f11b22f990ab85382bbd107c9c 100644 (file)
--- a/src/libcharon/bus/bus.c
+++ b/src/libcharon/bus/bus.c
@@ -269,7 +269,7 @@ typedef struct {
        /** debug level */
        level_t level;
        /** message */
-       char message[8192];
+       char *message;
 } log_data_t;
 
 /**
@@ -294,13 +294,33 @@ METHOD(bus_t, vlog, void,
        {
                linked_list_t *loggers = this->loggers[group];
                log_data_t data;
+               va_list copy;
+               char buf[1024];
+               ssize_t len;
 
                data.ike_sa = this->thread_sa->get(this->thread_sa);
                data.thread = thread_current_id();
                data.group = group;
                data.level = level;
-               vsnprintf(data.message, sizeof(data.message), format, args);
-               loggers->invoke_function(loggers, (linked_list_invoke_t)log_cb, &data);
+               data.message = buf;
+
+               va_copy(copy, args);
+               len = vsnprintf(data.message, sizeof(buf), format, copy);
+               va_end(copy);
+               if (len >= sizeof(buf))
+               {
+                       data.message = malloc(len);
+                       len = vsnprintf(data.message, len, format, args);
+               }
+               if (len > 0)
+               {
+                       loggers->invoke_function(loggers, (linked_list_invoke_t)log_cb,
+                                                                        &data);
+               }
+               if (data.message != buf)
+               {
+                       free(data.message);
+               }
        }
        this->log_lock->unlock(this->log_lock);
 }