lib: add hooks for external logging function

Signed-off-by: Emanuele Di Pascale <emanuele@voltanet.io>

2 files changed, 14 insertions, 0 deletions

diff --git a/lib/log.c b/lib/log.c
index 12a1d7fbe..f93695761 100644
--- a/lib/log.c
+++ b/lib/log.c
@@ -29,6 +29,7 @@
 #include "memory.h"
 #include "command.h"
 #include "lib_errors.h"
+#include "lib/hook.h"
 
 #ifndef SUNOS_5
 #include <sys/un.h>
@@ -46,6 +47,10 @@
 
 DEFINE_MTYPE_STATIC(LIB, ZLOG, "Logging")
 
+/* hook for external logging */
+DEFINE_HOOK(zebra_ext_log, (int priority, const char *format, va_list args),
+	    (priority, format, args));
+
 static int logfile_fd = -1; /* Used in signal handler. */
 
 struct zlog *zlog_default = NULL;
@@ -213,6 +218,9 @@ void vzlog(int priority, const char *format, va_list args)
 	tsctl.already_rendered = 0;
 	struct zlog *zl = zlog_default;
 
+	/* call external hook */
+	hook_call(zebra_ext_log, priority, format, args);
+
 	/* When zlog_default is also NULL, use stderr for logging. */
 	if (zl == NULL) {
 		tsctl.precision = 0;
diff --git a/lib/log.h b/lib/log.h
index be1d9fb59..8fb98a02a 100644
--- a/lib/log.h
+++ b/lib/log.h
@@ -26,6 +26,12 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <stdio.h>
+#include <stdarg.h>
+#include "lib/hook.h"
+
+/* Hook for external logging function */
+DECLARE_HOOK(zebra_ext_log, (int priority, const char *format, va_list args),
+	     (priority, format, args));
 
 /* Here is some guidance on logging levels to use:
  *