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diff --git a/usr.sbin/pppd/upap.h b/usr.sbin/pppd/upap.h
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+/*
+ * upap.h - User/Password Authentication Protocol definitions.
+ *
+ * Copyright (c) 1989 Carnegie Mellon University.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by Carnegie Mellon University.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * $Id: upap.h,v 1.2 1994/04/11 07:13:44 paulus Exp $
+ */
+
+/*
+ * Packet header = Code, id, length.
+ */
+#define UPAP_HEADERLEN	(sizeof (u_char) + sizeof (u_char) + sizeof (u_short))
+
+
+/*
+ * UPAP codes.
+ */
+#define UPAP_AUTHREQ	1	/* Authenticate-Request */
+#define UPAP_AUTHACK	2	/* Authenticate-Ack */
+#define UPAP_AUTHNAK	3	/* Authenticate-Nak */
+
+
+/*
+ * Each interface is described by upap structure.
+ */
+typedef struct upap_state {
+    int us_unit;		/* Interface unit number */
+    char *us_user;		/* User */
+    int us_userlen;		/* User length */
+    char *us_passwd;		/* Password */
+    int us_passwdlen;		/* Password length */
+    int us_clientstate;		/* Client state */
+    int us_serverstate;		/* Server state */
+    u_char us_id;		/* Current id */
+    int us_timeouttime;		/* Timeout time in milliseconds */
+    int us_transmits;		/* Number of auth-reqs sent */
+    int us_maxtransmits;	/* Maximum number of auth-reqs to send */
+} upap_state;
+
+
+/*
+ * Client states.
+ */
+#define UPAPCS_INITIAL	0	/* Connection down */
+#define UPAPCS_CLOSED	1	/* Connection up, haven't requested auth */
+#define UPAPCS_PENDING	2	/* Connection down, have requested auth */
+#define UPAPCS_AUTHREQ	3	/* We've sent an Authenticate-Request */
+#define UPAPCS_OPEN	4	/* We've received an Ack */
+#define UPAPCS_BADAUTH	5	/* We've received a Nak */
+
+/*
+ * Server states.
+ */
+#define UPAPSS_INITIAL	0	/* Connection down */
+#define UPAPSS_CLOSED	1	/* Connection up, haven't requested auth */
+#define UPAPSS_PENDING	2	/* Connection down, have requested auth */
+#define UPAPSS_LISTEN	3	/* Listening for an Authenticate */
+#define UPAPSS_OPEN	4	/* We've sent an Ack */
+#define UPAPSS_BADAUTH	5	/* We've sent a Nak */
+
+
+/*
+ * Timeouts.
+ */
+#define UPAP_DEFTIMEOUT	3	/* Timeout time in seconds */
+
+
+extern upap_state upap[];
+
+void upap_init __ARGS((int));
+void upap_authwithpeer __ARGS((int, char *, char *));
+void upap_authpeer __ARGS((int));
+void upap_lowerup __ARGS((int));
+void upap_lowerdown __ARGS((int));
+void upap_input __ARGS((int, u_char *, int));
+void upap_protrej __ARGS((int));
+int  upap_printpkt __ARGS((u_char *, int,
+			   void (*) __ARGS((void *, char *, ...)), void *));