Subversion Repositories planix.SVN

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;
        char*   valfmt;
        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 Mflag;
extern int Nflag;
extern int dflag;
extern int Cflag;

typedef Filter *Filterptr;
#define YYSTYPE Filterptr
extern Filter *filter;