X-Git-Url: http://www.project-moonshot.org/gitweb/?a=blobdiff_plain;f=wrap_size_limit.c;h=aadf1b48851be6adb653055645145536155ceab0;hb=refs%2Fheads%2Fjson-name;hp=3e0654bfc89622e45b276dd4605e2a0311459de1;hpb=31cef49681566dc99790812f31de834dfce02c74;p=mech_eap.orig

diff --git a/wrap_size_limit.c b/wrap_size_limit.c
index 3e0654b..aadf1b4 100644
--- a/wrap_size_limit.c
+++ b/wrap_size_limit.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010, JANET(UK)
+ * Copyright (c) 2011, JANET(UK)
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -30,5 +30,68 @@
  * SUCH DAMAGE.
  */
 
+/*
+ * Message protection services: determine maximum input size.
+ */
+
 #include "gssapiP_eap.h"
 
+OM_uint32
+gss_wrap_size_limit(OM_uint32 *minor,
+                    gss_ctx_id_t ctx,
+                    int conf_req_flag,
+                    gss_qop_t qop_req,
+                    OM_uint32 req_output_size,
+                    OM_uint32 *max_input_size)
+{
+    gss_iov_buffer_desc iov[4];
+    OM_uint32 major, overhead;
+
+    if (ctx == GSS_C_NO_CONTEXT) {
+        *minor = EINVAL;
+        return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_NO_CONTEXT;
+    }
+
+    *minor = 0;
+
+    GSSEAP_MUTEX_LOCK(&ctx->mutex);
+
+    if (!CTX_IS_ESTABLISHED(ctx)) {
+        major = GSS_S_NO_CONTEXT;
+        *minor = GSSEAP_CONTEXT_INCOMPLETE;
+        goto cleanup;
+    }
+
+    iov[0].type = GSS_IOV_BUFFER_TYPE_HEADER;
+    iov[0].buffer.value = NULL;
+    iov[0].buffer.length = 0;
+
+    iov[1].type = GSS_IOV_BUFFER_TYPE_DATA;
+    iov[1].buffer.length = req_output_size;
+    iov[1].buffer.value = NULL;
+
+    iov[2].type = GSS_IOV_BUFFER_TYPE_PADDING;
+    iov[2].buffer.value = NULL;
+    iov[2].buffer.length = 0;
+
+    iov[3].type = GSS_IOV_BUFFER_TYPE_TRAILER;
+    iov[3].buffer.value = NULL;
+    iov[3].buffer.length = 0;
+
+    major = gssEapWrapIovLength(minor, ctx, conf_req_flag, qop_req,
+                                NULL, iov, 4);
+    if (GSS_ERROR(major))
+        goto cleanup;
+
+    overhead = iov[0].buffer.length + iov[3].buffer.length;
+
+    if (iov[2].buffer.length == 0 && overhead < req_output_size)
+        *max_input_size = req_output_size - overhead;
+    else
+        *max_input_size = 0;
+
+cleanup:
+    GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
+
+    return major;
+}