new goodies

src/cmd/ip/snoopy/dat.h

@@ -0,0 +1,106 @@
+typedef struct Field Field;
+typedef struct Filter Filter;
+typedef struct Msg Msg;
+typedef struct Mux Mux;
+typedef struct Proto Proto;
+
+#define NetS(x) ((((uchar*)x)[0]<<8) | ((uchar*)x)[1])
+#define Net3(x) ((((uchar*)x)[0]<<16) | (((uchar*)x)[1]<<8) | ((uchar*)x)[2])
+#define NetL(x) ((((uchar*)x)[0]<<24) | (((uchar*)x)[1]<<16) | (((uchar*)x)[2]<<8) | ((uchar*)x)[3])
+
+/*
+ *  one per protocol module
+ */
+struct Proto
+{
+	char*	name;
+	void	(*compile)(Filter*);
+	int	(*filter)(Filter*, Msg*);
+	int	(*seprint)(Msg*);
+	Mux*	mux;
+	Field*	field;
+	int	(*framer)(int, uchar*, int);
+};
+extern Proto *protos[];
+
+/*
+ *  one per protocol module, pointed to by Proto.mux
+ */
+struct Mux
+{
+	char*	name;
+	ulong	val;
+	Proto*	pr;
+};
+
+/*
+ *  a field defining a comparison filter
+ */
+struct Field
+{
+	char*	name;
+	int	ftype;
+	int	subop;
+	char*	help;
+};
+
+/*
+ *  the status of the current message walk
+ */
+struct Msg
+{
+	uchar	*ps;	/* packet ptr */
+	uchar	*pe;	/* packet end */
+
+	char	*p;	/* buffer start */
+	char	*e;	/* buffer end */
+
+	int	needroot;	/* pr is root, need to see in expression */
+	Proto	*pr;	/* current/next protocol */	
+};
+
+enum
+{
+	Fnum,		/* just a number */
+	Fether,		/* ethernet address */
+	Fv4ip,		/* v4 ip address */
+	Fv6ip,		/* v6 ip address */
+	Fba,		/* byte array */
+};
+
+/*
+ *  a node in the filter tree
+ */
+struct Filter {
+	int	op;	/* token type */
+	char	*s;	/* string */
+	Filter	*l;
+	Filter	*r;
+
+	Proto	*pr;	/* next protocol;
+
+	/* protocol specific */
+	int	subop;
+	ulong	param;
+	union {
+		ulong	ulv;
+		vlong	vlv;
+		uchar	a[32];
+	};
+};
+
+extern void	yyinit(char*);
+extern int	yyparse(void);
+extern Filter*	newfilter(void);
+extern void	compile_cmp(char*, Filter*, Field*);
+extern void	demux(Mux*, ulong, ulong, Msg*, Proto*);
+extern int	defaultframer(int, uchar*, int);
+extern int	opendevice(char*, int);
+
+extern int Nflag;
+extern int dflag;
+extern int Cflag;
+
+typedef Filter *Filterptr;
+#define YYSTYPE Filterptr
+extern Filter *filter;