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#include <u.h>
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#include <libc.h>
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#include <ip.h>
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#include "dat.h"
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#include "protos.h"
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typedef struct Hdr	Hdr;
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struct Hdr
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{
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	uchar	vi;		/* version */
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	uchar	type;
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	uchar	len[2];	/* length of data following this header */
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};
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enum
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{
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	EAPOLHDR=	4,		/* sizeof(Hdr) */
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	/* eapol types */
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	Eap = 0,
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	Start,
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	Logoff,
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	Key,
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	AsfAlert,
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};
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enum
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{
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	Ot,	/* type */
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};
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static Mux p_mux[] =
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{
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	{ "eap", Eap, },
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	{ "eapol_start", Start, },
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	{ "eapol_logoff", Logoff, },
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	{ "eapol_key", Key, },
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	{ "asf_alert", AsfAlert, },
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	{ 0 }
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};
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static void
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p_compile(Filter *f)
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{
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	Mux *m;
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	for(m = p_mux; m->name != nil; m++)
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		if(strcmp(f->s, m->name) == 0){
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			f->pr = m->pr;
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			f->ulv = m->val;
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			f->subop = Ot;
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			return;
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		}
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	sysfatal("unknown eapol field or type: %s", f->s);
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}
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static int
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p_filter(Filter *f, Msg *m)
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{
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	Hdr *h;
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	if(m->pe - m->ps < EAPOLHDR)
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		return 0;
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	h = (Hdr*)m->ps;
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	/* len does not include header */
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	m->ps += EAPOLHDR;
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	switch(f->subop){
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	case Ot:
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		return h->type == f->ulv;
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	}
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	return 0;
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}
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static char*
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op(int i)
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{
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	static char x[20];
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	switch(i){
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	case Eap:
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		return "Eap";
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	case Start:
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		return "Start";
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	case Logoff:
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		return "Logoff";
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	case Key:
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		return "Key";
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	case AsfAlert:
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		return "AsfAlert";
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	default:
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		sprint(x, "%1d", i);
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		return x;
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	}
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}
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static int
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p_seprint(Msg *m)
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{
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	Hdr *h;
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	int len;
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	if(m->pe - m->ps < EAPOLHDR)
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		return -1;
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	h = (Hdr*)m->ps;
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	/* len does not include header */
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	m->ps += EAPOLHDR;
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	/* truncate the message if there's extra */
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	len = NetS(h->len);
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	if(m->ps + len < m->pe)
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		m->pe = m->ps + len;
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	else if(m->ps+len > m->pe)
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		return -1;
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	/* next protocol  depending on type*/
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	demux(p_mux, h->type, h->type, m, &dump);
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	m->p = seprint(m->p, m->e, "type=%s version=%1d datalen=%1d",
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			op(h->type), h->vi, len);
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	return 0;
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}
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Proto eapol =
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{
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	"eapol",
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	p_compile,
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	p_filter,
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	p_seprint,
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	p_mux,
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	"%lud",
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	nil,
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	defaultframer,
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};