From b67dab18678d3628929999fc77c48a5bc660e5e2 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Thu, 21 Jun 2012 02:20:39 +0100
Subject: [PATCH] transform: add ->valid() function

This allows outside callers to find out whether the transform has been
keyed, and can therefore relieve them of the need to track this
separately.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 secnet.h    | 2 ++
 transform.c | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/secnet.h b/secnet.h
index b276798..6ac64e3 100644
--- a/secnet.h
+++ b/secnet.h
@@ -387,6 +387,7 @@ struct site_if {
 
 typedef struct transform_inst_if *transform_createinstance_fn(void *st);
 typedef bool_t transform_setkey_fn(void *st, uint8_t *key, int32_t keylen);
+typedef bool_t transform_valid_fn(void *st); /* 0: no key; 1: ok */
 typedef void transform_delkey_fn(void *st);
 typedef void transform_destroyinstance_fn(void *st);
 /* Returns:
@@ -400,6 +401,7 @@ typedef uint32_t transform_apply_fn(void *st, struct buffer_if *buf,
 struct transform_inst_if {
     void *st;
     transform_setkey_fn *setkey;
+    transform_valid_fn *valid;
     transform_delkey_fn *delkey;
     transform_apply_fn *forwards;
     transform_apply_fn *reverse;
diff --git a/transform.c b/transform.c
index f1da564..289b02e 100644
--- a/transform.c
+++ b/transform.c
@@ -68,6 +68,13 @@ static bool_t transform_setkey(void *sst, uint8_t *key, int32_t keylen)
     return True;
 }
 
+static bool_t transform_valid(void *sst)
+{
+    struct transform_inst *ti=sst;
+
+    return ti->keyed;
+}
+
 static void transform_delkey(void *sst)
 {
     struct transform_inst *ti=sst;
@@ -271,6 +278,7 @@ static struct transform_inst_if *transform_create(void *sst)
 
     ti->ops.st=ti;
     ti->ops.setkey=transform_setkey;
+    ti->ops.valid=transform_valid;
     ti->ops.delkey=transform_delkey;
     ti->ops.forwards=transform_forward;
     ti->ops.reverse=transform_reverse;
-- 
2.11.0