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typedef	struct	Fcall	Fcall;
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/* see /sys/include/auth.h */
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enum
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{
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	DOMLEN=		48,		/* length of an authentication domain name */
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	DESKEYLEN=	7,		/* length of a des key for encrypt/decrypt */
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	CHALLEN=	8,		/* length of a challenge */
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	NETCHLEN=	16,		/* max network challenge length	*/
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	CONFIGLEN=	14,
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	KEYDBLEN=	NAMELEN+DESKEYLEN+4+2
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};
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#define	TICKETLEN	(CHALLEN+2*NAMELEN+DESKEYLEN+1)
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#define	AUTHENTLEN	(CHALLEN+4+1)
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struct	Fcall
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{
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	char	type;
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	short	fid;
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	unsigned short	tag;
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	union
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	{
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		struct
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		{
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			unsigned short	oldtag;		/* T-Flush */
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			Qid	qid;		/* R-Attach, R-Walk, R-Open, R-Create */
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			char	rauth[AUTHENTLEN];	/* Rattach */
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		};
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		struct
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		{
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			char	uname[NAMELEN];	/* T-Attach */
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			char	aname[NAMELEN];	/* T-Attach */
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			char	ticket[TICKETLEN];	/* T-Attach */
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			char	auth[AUTHENTLEN];/* T-Attach */
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		};
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		struct
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		{
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			char	ename[ERRLEN];	/* R-Error */
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			char	authid[NAMELEN];	/* R-session */
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			char	authdom[DOMLEN];	/* R-session */
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			char	chal[CHALLEN];		/* T-session/R-session */
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		};
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		struct
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		{
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			long	perm;		/* T-Create */
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			short	newfid;		/* T-Clone, T-Clwalk */
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			char	name[NAMELEN];	/* T-Walk, T-Clwalk, T-Create */
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			char	mode;		/* T-Create, T-Open */
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		};
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		struct
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		{
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			long	offset;		/* T-Read, T-Write */
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			long	count;		/* T-Read, T-Write, R-Read */
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			char	*data;		/* T-Write, R-Read */
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		};
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		struct
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		{
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			char	stat[DIRLEN];	/* T-Wstat, R-Stat */
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		};
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	};
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};
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#define	MAXFDATA	8192
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#define	MAXMSG		160	/* max header sans data */
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#define NOTAG		0xFFFF	/* Dummy tag */
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enum
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{
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	Tmux =		48,
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	Rmux,			/* illegal */
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	Tnop =		50,
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	Rnop,
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	Tosession =	52,	/* illegal */
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	Rosession,		/* illegal */
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	Terror =	54,	/* illegal */
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	Rerror,
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	Tflush =	56,
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	Rflush,
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	Toattach =	58,	/* illegal */
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	Roattach,		/* illegal */
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	Tclone =	60,
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	Rclone,
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	Twalk =		62,
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	Rwalk,
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	Topen =		64,
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	Ropen,
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	Tcreate =	66,
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	Rcreate,
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	Tread =		68,
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	Rread,
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	Twrite =	70,
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	Rwrite,
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	Tclunk =	72,
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	Rclunk,
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	Tremove =	74,
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	Rremove,
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	Tstat =		76,
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	Rstat,
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	Twstat =	78,
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	Rwstat,
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	Tclwalk =	80,
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	Rclwalk,
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	Tauth =		82,	/* illegal */
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	Rauth,			/* illegal */
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	Tsession =	84,
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	Rsession,
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	Tattach =	86,
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	Rattach,
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};
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int	convM2S(char*, Fcall*, int);
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int	convS2M(Fcall*, char*);
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int	convM2D(char*, Dir*);
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int	convD2M(Dir*, char*);
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char*	getS(int, char*, Fcall*, long*);