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+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ */
+#ifndef HOSTFILE_H
+#define HOSTFILE_H
+
+/*
+ * Checks whether the given host is already in the list of our known hosts.
+ * Returns HOST_OK if the host is known and has the specified key, HOST_NEW
+ * if the host is not known, and HOST_CHANGED if the host is known but used
+ * to have a different host key. The host must be in all lowercase.
+ */
+typedef enum {
+ HOST_OK, HOST_NEW, HOST_CHANGED
+} HostStatus;
+HostStatus
+check_host_in_hostfile(const char *filename, const char *host, Key *key, Key *found);
+
+/*
+ * Appends an entry to the host file. Returns false if the entry could not
+ * be appended.
+ */
+int add_host_to_hostfile(const char *filename, const char *host, Key *key);
+
+#endif
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