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WebSVN – planix.SVN – Blame – /os/branches/feature_unix/sys/src/cmd/ip/snoopy/dat.h – Rev 2

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typedef struct Field Field;
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typedef struct Filter Filter;
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typedef struct Msg Msg;
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typedef struct Mux Mux;
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typedef struct Proto Proto;
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#define NetS(x) ((((uchar*)x)[0]<<8) | ((uchar*)x)[1])
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#define Net3(x) ((((uchar*)x)[0]<<16) | (((uchar*)x)[1]<<8) | ((uchar*)x)[2])
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#define NetL(x) ((((uchar*)x)[0]<<24) | (((uchar*)x)[1]<<16) | (((uchar*)x)[2]<<8) | ((uchar*)x)[3])
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/*
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 *  one per protocol module
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 */
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struct Proto
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{
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	char*	name;
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	void	(*compile)(Filter*);
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	int	(*filter)(Filter*, Msg*);
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	int	(*seprint)(Msg*);
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	Mux*	mux;
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	char*	valfmt;
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	Field*	field;
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	int	(*framer)(int, uchar*, int);
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};
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extern Proto *protos[];
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/*
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 *  one per protocol module, pointed to by Proto.mux
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 */
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struct Mux
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{
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	char*	name;
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	ulong	val;
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	Proto*	pr;
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};
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/*
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 *  a field defining a comparison filter
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 */
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struct Field
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{
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	char*	name;
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	int	ftype;
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	int	subop;
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	char*	help;
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};
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/*
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 *  the status of the current message walk
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 */
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struct Msg
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{
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	uchar	*ps;	/* packet ptr */
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	uchar	*pe;	/* packet end */
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	char	*p;	/* buffer start */
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	char	*e;	/* buffer end */
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	int	needroot;	/* pr is root, need to see in expression */
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	Proto	*pr;	/* current/next protocol */
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};
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enum
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{
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	Fnum,		/* just a number */
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	Fether,		/* ethernet address */
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	Fv4ip,		/* v4 ip address */
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	Fv6ip,		/* v6 ip address */
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	Fba,		/* byte array */
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};
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/*
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 *  a node in the filter tree
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 */
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struct Filter {
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	int	op;	/* token type */
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	char	*s;	/* string */
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	Filter	*l;
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	Filter	*r;
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	Proto	*pr;	/* next protocol;
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	/* protocol specific */
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	int	subop;
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	ulong	param;
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	union {
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		ulong	ulv;
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		vlong	vlv;
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		uchar	a[32];
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	};
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};
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extern void	yyinit(char*);
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extern int	yyparse(void);
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extern Filter*	newfilter(void);
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extern void	compile_cmp(char*, Filter*, Field*);
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extern void	demux(Mux*, ulong, ulong, Msg*, Proto*);
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extern int	defaultframer(int, uchar*, int);
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extern int Mflag;
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extern int Nflag;
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extern int dflag;
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extern int Cflag;
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typedef Filter *Filterptr;
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#define YYSTYPE Filterptr
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extern Filter *filter;