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   flags;
        uchar   ln[4];  /* optional, present if L flag set*/
};

enum
{
        FLHDR=  1,      /* sizeof(flags) */
        LNHDR=  4,      /* sizeof(ln) */
};

enum
{
        FlagL = 1<<7, 
        FlagM = 1<<6,
        FlagS = 1<<5,
        Version = (1<<2)|(1<<1)|(1<<0),
};

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

static char*
flags(int f)
{
        static char fl[20];
        char *p;

        p = fl;
        if(f & FlagS)
                *p++ = 'S';
        if(f & FlagM)
                *p++ = 'M';
        if(f & FlagL)
                *p++ = 'L';
        *p = 0;
        return fl;
}

static int
p_seprint(Msg *m)
{
        Hdr *h;

        if(m->pe - m->ps < FLHDR)
                return -1;

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

        if (h->flags & FlagL) {
                if(m->pe - m->ps < LNHDR)
                        return -1;
                else
                        m->ps += LNHDR;
        }

        /* next protocol  depending on type*/
        demux(p_mux, 0, 0, m, &dump);

        m->p = seprint(m->p, m->e, "ver=%1d", h->flags & Version);
        m->p = seprint(m->p, m->e, " fl=%s", flags(h->flags));

        if (h->flags & FlagL)
                m->p = seprint(m->p, m->e, " totallen=%1d", NetL(h->ln));

        /* these are not in the header, just print them for our convenience */
        m->p = seprint(m->p, m->e, " dataln=%1ld", m->pe - m->ps);
        if ((h->flags & (FlagL|FlagS|FlagM)) == 0 && m->ps == m->pe)
                m->p = seprint(m->p, m->e, " ack");

        return 0;
}

Proto ttls =
{
        "ttls",
        nil,
        nil,
        p_seprint,
        p_mux, /* we need this to get the dump printed */
        "%lud",
        nil,
        defaultframer,
};