Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include <ip.h>
#include "dat.h"
#include "protos.h"

typedef struct Hdr Hdr;
struct Hdr {
        uchar verstype;
        uchar code;
        uchar sessid[2];
        uchar length[2];        /* of payload */
};
enum
{
        HDRSIZE = 1+1+2+2
};

static Mux p_mux[] =
{
        {"ppp",         0,      } ,
        {0}
};

enum
{
        Overs,
        Otype,
        Ocode,
        Osess,
};

static Field p_fields[] = 
{
        {"v",   Fnum,   Overs,  "version",      } ,
        {"t",   Fnum,   Otype,  "type", } ,
        {"c",   Fnum,   Ocode,  "code" } ,
        {"s",   Fnum,   Osess,  "sessid" } ,
        {0}
};

static void
p_compilesess(Filter *f)
{
//      Mux *m;

        if(f->op == '='){
                compile_cmp(pppoe_sess.name, f, p_fields);
                return;
        }
/*
        for(m = p_mux; m->name != nil; m++)
                if(strcmp(f->s, m->name) == 0){
                        f->pr = m->pr;
                        f->ulv = m->val;
                        f->subop = Ot;
                        return;
                }
*/
        sysfatal("unknown pppoe field or protocol: %s", f->s);
}
static void
p_compiledisc(Filter *f)
{
//      Mux *m;

        if(f->op == '='){
                compile_cmp(pppoe_disc.name, f, p_fields);
                return;
        }
/*
        for(m = p_mux; m->name != nil; m++)
                if(strcmp(f->s, m->name) == 0){
                        f->pr = m->pr;
                        f->ulv = m->val;
                        f->subop = Ot;
                        return;
                }
*/
        sysfatal("unknown pppoe field or protocol: %s", f->s);
}

static int
p_filter(Filter *f, Msg *m)
{
        Hdr *h;

        if(m->pe - m->ps < HDRSIZE)
                return 0;

        h = (Hdr*)m->ps;
        m->ps += HDRSIZE;

        switch(f->subop){
        case Overs:
                return (h->verstype>>4) == f->ulv;
        case Otype:
                return (h->verstype&0xF) == f->ulv;
        case Ocode:
                return h->code == f->ulv;
        case Osess:
                return NetS(h->sessid) == f->ulv;
        }
        return 0;
}

/* BUG: print all the discovery types */
static int
p_seprintdisc(Msg *m)
{
        Hdr *h;
        int len;

        len = m->pe - m->ps;
        if(len < HDRSIZE)
                return -1;

        h = (Hdr*)m->ps;
        m->ps += HDRSIZE;

        m->pr = nil;

        m->p = seprint(m->p, m->e, "v=%d t=%d c=0x%x s=0x%ux, len=%d",
                h->verstype>>4, h->verstype&0xF, h->code, NetS(h->sessid), NetS(h->length));

        return 0;
}

static int
p_seprintsess(Msg *m)
{
        Hdr *h;
        int len;

        len = m->pe - m->ps;
        if(len < HDRSIZE)
                return -1;

        h = (Hdr*)m->ps;
        m->ps += HDRSIZE;

        /* this will call ppp for me */
        demux(p_mux, 0, 0, m, &dump);

        m->p = seprint(m->p, m->e, "v=%d t=%d c=0x%x s=0x%ux, len=%d",
                h->verstype>>4, h->verstype&0xF, h->code, NetS(h->sessid), NetS(h->length));

        return 0;
}

Proto pppoe_disc =
{
        "pppoe_disc",
        p_compiledisc,
        p_filter,
        p_seprintdisc,
        p_mux,
        "%lud",
        p_fields,
        defaultframer
};

Proto pppoe_sess =
{
        "pppoe_sess",
        p_compilesess,
        p_filter,
        p_seprintsess,
        p_mux,
        "%lud",
        p_fields,
        defaultframer
};