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+/*
+ * Copyright (c) 2015 Kazuho Oku, DeNA Co., Ltd.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+#ifndef NEVERBLEED_H
+#define NEVERBLEED_H
+
+#include <pthread.h>
+#include <sys/un.h>
+#include <openssl/engine.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define NEVERBLEED_ERRBUF_SIZE (256)
+#define NEVERBLEED_AUTH_TOKEN_SIZE 32
+
+typedef struct st_neverbleed_t {
+    ENGINE *engine;
+    pid_t daemon_pid;
+    struct sockaddr_un sun_;
+    pthread_key_t thread_key;
+    unsigned char auth_token[NEVERBLEED_AUTH_TOKEN_SIZE];
+} neverbleed_t;
+
+/**
+ * initializes the privilege separation engine (returns 0 if successful)
+ */
+int neverbleed_init(neverbleed_t *nb, char *errbuf);
+/**
+ * loads a private key file (returns 1 if successful)
+ */
+int neverbleed_load_private_key_file(neverbleed_t *nb, SSL_CTX *ctx, const char *fn, char *errbuf);
+/**
+ * setuidgid (also changes the file permissions so that `user` can connect to the daemon, if change_socket_ownership is non-zero)
+ */
+int neverbleed_setuidgid(neverbleed_t *nb, const char *user, int change_socket_ownership);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif