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WebSVN – planix.SVN – Blame – /os/branches/feature_tlsv12/sys/src/cmd/ip/snoopy/eapol_key.c – Rev 2

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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
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{
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	uchar	desc;
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} Hdr;
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typedef struct Rc4KeyDesc
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{
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	uchar	ln[2];
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	uchar	replay[8];
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	uchar	iv[16];
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	uchar	idx;
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	uchar	md[16];
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} Rc4KeyDesc;
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enum
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{
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	HDR=	1,		/* sizeof(Hdr) */
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	RC4KEYDESC=	43,	/* sizeof(Rc4KeyDesc) */
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	DescTpRC4= 1,
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};
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enum
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{
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	Odesc,
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};
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static Mux p_mux[] =
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{
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	{ "rc4keydesc", DescTpRC4, },
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	{ 0 }
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};
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static Mux p_muxrc4[] =
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{
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	{ "dump", 0, },
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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 = Odesc;
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			return;
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		}
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	sysfatal("unknown eap_key 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 < HDR)
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		return 0;
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	h = (Hdr*)m->ps;
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	m->ps += HDR;
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	switch(f->subop){
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	case Odesc:
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		return h->desc == 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 DescTpRC4:
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		return "RC4KeyDesc";
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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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	if(m->pe - m->ps < HDR)
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		return -1;
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	h = (Hdr*)m->ps;
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	m->ps += HDR;
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	/* next protocol  depending on type*/
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	demux(p_mux, h->desc, h->desc, m, &dump);
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	m->p = seprint(m->p, m->e, "desc=%s", op(h->desc));
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	return 0;
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}
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static int
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p_seprintrc4(Msg *m)
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{
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	Rc4KeyDesc *h;
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	int len;
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	if(m->pe - m->ps < RC4KEYDESC)
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		return -1;
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	h = (Rc4KeyDesc*)m->ps;
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	m->ps += RC4KEYDESC;
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	m->pr = nil;
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	len = m->pe - m->ps;
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	m->p = seprint(m->p, m->e, "keylen=%1d replay=%1d iv=%1d idx=%1d md=%1d",
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			NetS(h->ln), NetS(h->replay), NetS(h->iv), h->idx, NetS(h->md));
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	m->p = seprint(m->p, m->e, " dataln=%d", len);
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	if (len > 0)
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		m->p = seprint(m->p, m->e, " data=%.*H", len, m->ps);
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	return 0;
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}
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Proto eapol_key =
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{
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	"eapol_key",
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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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};
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Proto rc4keydesc =
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{
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	"rc4keydesc",
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	p_compile,
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	nil,
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	p_seprintrc4,
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	nil,
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	nil,
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	nil,
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	defaultframer,
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};