Better error reporting through com_err

[mech_eap.git] / wrap_size_limit.c

diff --git a/wrap_size_limit.c b/wrap_size_limit.c
index 3e0654b..8fd9251 100644 (file)
--- a/wrap_size_limit.c
+++ b/wrap_size_limit.c
@@ -32,3 +32,62 @@
 
 #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_NO_CONTEXT;
+    }
+
+    *minor = 0;
+
+    GSSEAP_MUTEX_LOCK(&ctx->mutex);
+
+    if (!CTX_IS_ESTABLISHED(ctx)) {
+        *minor = GSSEAP_CONTEXT_INCOMPLETE;
+        major = GSS_S_NO_CONTEXT;
+        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;
+}