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

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#include <u.h>
2 
#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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{	uchar	type;
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	uchar	code;
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	uchar	cksum[2];	/* Checksum */
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	uchar	data[1];
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};
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enum
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{
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	ICMPLEN=	4,
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};
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enum
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{
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	Ot,	/* type */
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	Op,	/* next protocol */
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};
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static Field p_fields[] =
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{
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	{"t",		Fnum,	Ot,	"type",	} ,
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	{0}
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};
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enum
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{
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	EchoRep=	0,
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	Unreachable=	3,
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	SrcQuench=	4,
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	Redirect=	5,
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	EchoReq=	8,
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	TimeExceed=	11,
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	ParamProb=	12,
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	TSreq=		13,
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	TSrep=		14,
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	InfoReq=	15,
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	InfoRep=	16,
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};
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static Mux p_mux[] =
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{
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	{"ip",	Unreachable, },
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	{"ip",	SrcQuench, },
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	{"ip",	Redirect, },
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	{"ip",	TimeExceed, },
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	{"ip",	ParamProb, },
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	{0},
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};
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char *icmpmsg[256] =
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{
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[EchoRep]	"EchoRep",
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[Unreachable]	"Unreachable",
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[SrcQuench]	"SrcQuench",
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[Redirect]	"Redirect",
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[EchoReq]	"EchoReq",
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[TimeExceed]	"TimeExceed",
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[ParamProb]	"ParamProb",
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[TSreq]		"TSreq",
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[TSrep]		"TSrep",
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[InfoReq]	"InfoReq",
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[InfoRep]	"InfoRep",
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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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	if(f->op == '='){
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		compile_cmp(icmp.name, f, p_fields);
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		return;
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	}
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	if(strcmp(f->s, "ip") == 0){
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		f->pr = p_mux->pr;
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		f->subop = Op;
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		return;
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	}
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	sysfatal("unknown icmp field or protocol: %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 < ICMPLEN)
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		return 0;
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	h = (Hdr*)m->ps;
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	m->ps += ICMPLEN;
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	switch(f->subop){
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	case Ot:
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		if(h->type == f->ulv)
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			return 1;
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		break;
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	case Op:
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		switch(h->type){
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		case Unreachable:
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		case TimeExceed:
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		case SrcQuench:
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		case Redirect:
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		case ParamProb:
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			m->ps += 4;
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			return 1;
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		}
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	}
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	return 0;
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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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	char *tn;
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	char *p = m->p;
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	char *e = m->e;
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	ushort cksum2, cksum;
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	h = (Hdr*)m->ps;
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	m->ps += ICMPLEN;
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	m->pr = &dump;
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	if(m->pe - m->ps < ICMPLEN)
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		return -1;
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	tn = icmpmsg[h->type];
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	if(tn == nil)
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		p = seprint(p, e, "t=%ud c=%d ck=%4.4ux", h->type,
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			h->code, (ushort)NetS(h->cksum));
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	else
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		p = seprint(p, e, "t=%s c=%d ck=%4.4ux", tn,
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			h->code, (ushort)NetS(h->cksum));
140 
	if(Cflag){
141 
		cksum = NetS(h->cksum);
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		h->cksum[0] = 0;
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		h->cksum[1] = 0;
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		cksum2 = ~ptclbsum((uchar*)h, m->pe - m->ps + ICMPLEN) & 0xffff;
145 
		if(cksum != cksum2)
146 
			p = seprint(p,e, " !ck=%4.4ux", cksum2);
147 
	}
148 
	switch(h->type){
149 
	case EchoRep:
150 
	case EchoReq:
151 
		m->ps += 4;
152 
		p = seprint(p, e, " id=%ux seq=%ux",
153 
			NetS(h->data), NetS(h->data+2));
154 
		break;
155 
	case TSreq:
156 
	case TSrep:
157 
		m->ps += 12;
158 
		p = seprint(p, e, " orig=%ud rcv=%ux xmt=%ux",
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			NetL(h->data), NetL(h->data+4),
160 
			NetL(h->data+8));
161 
		m->pr = nil;
162 
		break;
163 
	case InfoReq:
164 
	case InfoRep:
165 
		break;
166 
	case Unreachable:
167 
	case TimeExceed:
168 
	case SrcQuench:
169 
		m->ps += 4;
170 
		m->pr = &ip;
171 
		break;
172 
	case Redirect:
173 
		m->ps += 4;
174 
		m->pr = &ip;
175 
		p = seprint(p, e, "gw=%V", h->data);
176 
		break;
177 
	case ParamProb:
178 
		m->ps += 4;
179 
		m->pr = &ip;
180 
		p = seprint(p, e, "ptr=%2.2ux", h->data[0]);
181 
		break;
182 
	}
183 
	m->p = p;
184 
	return 0;
185 
}
186 
 
187 
Proto icmp =
188 
{
189 
	"icmp",
190 
	p_compile,
191 
	p_filter,
192 
	p_seprint,
193 
	p_mux,
194 
	"%lud",
195 
	p_fields,
196 
	defaultframer,
197 
};