From 87a52e0485d3281ebea6bf4b725aa8023690e96f Mon Sep 17 00:00:00 2001
From: rsc <devnull@localhost>
Date: Mon, 26 Dec 2005 04:48:52 +0000
Subject: new goodies

---
 src/cmd/ip/snoopy/pppoe_disc.c | 172 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 172 insertions(+)
 create mode 100755 src/cmd/ip/snoopy/pppoe_disc.c

(limited to 'src/cmd/ip/snoopy/pppoe_disc.c')

diff --git a/src/cmd/ip/snoopy/pppoe_disc.c b/src/cmd/ip/snoopy/pppoe_disc.c
new file mode 100755
index 00000000..4f17ebd7
--- /dev/null
+++ b/src/cmd/ip/snoopy/pppoe_disc.c
@@ -0,0 +1,172 @@
+#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,
+	p_fields,
+	defaultframer
+};
+
+Proto pppoe_sess =
+{
+	"pppoe_sess",
+	p_compilesess,
+	p_filter,
+	p_seprintsess,
+	p_mux,
+	p_fields,
+	defaultframer
+};
+
-- 
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