cleanup unused parameter warnings

[mech_eap.git] / display_status.c

diff --git a/display_status.c b/display_status.c
index 3b872dc..8729a96 100644 (file)
--- a/display_status.c
+++ b/display_status.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
@@ -30,8 +30,113 @@
  * SUCH DAMAGE.
  */
 
+/*
+ * Function for converting mechanism error codes to strings.
+ */
+
 #include "gssapiP_eap.h"
 
+static GSSEAP_THREAD_ONCE gssEapStatusInfoKeyOnce = GSSEAP_ONCE_INITIALIZER;
+static GSSEAP_THREAD_KEY gssEapStatusInfoKey;
+
+struct gss_eap_status_info {
+    OM_uint32 code;
+    char *message;
+    struct gss_eap_status_info *next;
+};
+
+static void
+destroyStatusInfo(void *arg)
+{
+    struct gss_eap_status_info *p = arg, *next;
+
+    for (p = arg; p != NULL; p = next) {
+        next = p->next;
+        GSSEAP_FREE(p->message);
+        GSSEAP_FREE(p);
+    }
+}
+
+static void
+createStatusInfoKey(void)
+{
+    GSSEAP_KEY_CREATE(&gssEapStatusInfoKey, destroyStatusInfo);
+}
+
+/*
+ * Associate a message with a mechanism (minor) status code. This function
+ * takes ownership of the message regardless of success. The message must
+ * be explicitly cleared, if required, so it is suggested that a specific
+ * minor code is either always or never associated with a message, to avoid
+ * dangling (and potentially confusing) error messages.
+ */
+static void
+saveStatusInfoNoCopy(OM_uint32 minor, char *message)
+{
+    struct gss_eap_status_info **next = NULL, *p;
+
+    GSSEAP_ONCE(&gssEapStatusInfoKeyOnce, createStatusInfoKey);
+
+    p = GSSEAP_GETSPECIFIC(gssEapStatusInfoKey);
+    for (; p != NULL; p = p->next) {
+        if (p->code == minor) {
+            /* Set message in-place */
+            if (p->message != NULL)
+                GSSEAP_FREE(p->message);
+            p->message = message;
+            return;
+        }
+        next = &p->next;
+    }
+
+    p = GSSEAP_CALLOC(1, sizeof(*p));
+    if (p == NULL) {
+        if (message != NULL)
+            GSSEAP_FREE(message);
+        return;
+    }
+
+    p->code = minor;
+    p->message = message;
+
+    if (next != NULL)
+        *next = p;
+    else
+        GSSEAP_SETSPECIFIC(gssEapStatusInfoKey, p);
+}
+
+static const char *
+getStatusInfo(OM_uint32 minor)
+{
+    struct gss_eap_status_info *p;
+
+    GSSEAP_ONCE(&gssEapStatusInfoKeyOnce, createStatusInfoKey);
+
+    for (p = GSSEAP_GETSPECIFIC(gssEapStatusInfoKey);
+         p != NULL;
+         p = p->next) {
+        if (p->code == minor)
+            return p->message;
+    }
+
+    return NULL;
+}
+
+void
+gssEapSaveStatusInfo(OM_uint32 minor, const char *format, ...)
+{
+    char *s;
+    int n;
+    va_list ap;
+
+    va_start(ap, format);
+    n = vasprintf(&s, format, ap);
+    va_end(ap);
+
+    if (n >= 0)
+        saveStatusInfoNoCopy(minor, s);
+}
+
 OM_uint32
 gss_display_status(OM_uint32 *minor,
                    OM_uint32 status_value,
@@ -40,32 +145,42 @@ gss_display_status(OM_uint32 *minor,
                    OM_uint32 *message_context,
                    gss_buffer_t status_string)
 {
-    OM_uint32 major, tmpMinor;
-    krb5_context krbContext;
+    OM_uint32 major;
+    krb5_context krbContext = NULL;
     const char *errMsg;
 
     status_string->length = 0;
     status_string->value = NULL;
 
     if (!gssEapIsMechanismOid(mech_type)) {
+        *minor = GSSEAP_WRONG_MECH;
         return GSS_S_BAD_MECH;
     }
 
-    if (status_type != GSS_C_MECH_CODE) {
+    if (status_type != GSS_C_MECH_CODE ||
+        *message_context != 0) {
         /* we rely on the mechglue for GSS_C_GSS_CODE */
+        *minor = 0;
         return GSS_S_BAD_STATUS;
     }
 
-    /* XXX we need to support RADIUS codes too? */
-    GSSEAP_KRB_INIT(&krbContext);
+    errMsg = getStatusInfo(status_value);
+    if (errMsg == NULL) {
+        GSSEAP_KRB_INIT(&krbContext);
+
+        /* Try the com_err message */
+        errMsg = krb5_get_error_message(krbContext, status_value);
+    }
 
-    errMsg = krb5_get_error_message(krbContext, status_value);
     if (errMsg != NULL) {
         major = makeStringBuffer(minor, errMsg, status_string);
-        krb5_free_error_message(krbContext, errMsg);
     } else {
         major = GSS_S_COMPLETE;
+        *minor = 0;
     }
 
-    return GSS_S_COMPLETE;
+    if (krbContext != NULL)
+        krb5_free_error_message(krbContext, errMsg);
+
+    return major;
 }