snoop_udp.c revision 410:51e39f6c6311 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29#include <stdio.h>
30#include <ctype.h>
31#include <string.h>
32#include <fcntl.h>
33#include <string.h>
34#include <sys/types.h>
35#include <sys/time.h>
36
37#include <sys/socket.h>
38#include <sys/sockio.h>
39#include <net/if.h>
40#include <netinet/in_systm.h>
41#include <netinet/in.h>
42#include <netinet/ip.h>
43#include <netinet/if_ether.h>
44#include <netinet/udp.h>
45#include "snoop.h"
46
47extern char *dlc_header;
48
49int
50interpret_udp(int flags, struct udphdr *udp, int iplen, int fraglen)
51{
52	char *data;
53	int udplen;
54	int sunrpc;
55	char *pname;
56	char buff [32];
57
58	if (fraglen < sizeof (struct udphdr))
59		return (fraglen);	/* incomplete header */
60
61	data = (char *)udp + sizeof (struct udphdr);
62	udplen = ntohs((ushort_t)udp->uh_ulen) - sizeof (struct udphdr);
63	fraglen -= sizeof (struct udphdr);
64	if (fraglen > udplen)
65		fraglen = udplen;
66
67	if (flags & F_SUM) {
68		(void) sprintf(get_sum_line(),
69			"UDP D=%d S=%d LEN=%d",
70			ntohs(udp->uh_dport),
71			ntohs(udp->uh_sport),
72			ntohs((ushort_t)udp->uh_ulen));
73	}
74
75	sunrpc = !reservedport(IPPROTO_UDP, ntohs(udp->uh_dport)) &&
76		!reservedport(IPPROTO_UDP, ntohs(udp->uh_sport)) &&
77		valid_rpc(data, udplen);
78
79	if (flags & F_DTAIL) {
80		show_header("UDP:  ", "UDP Header", udplen);
81		show_space();
82		(void) sprintf(get_line((char *)(uintptr_t)udp->uh_sport -
83		    dlc_header, 1), "Source port = %d", ntohs(udp->uh_sport));
84
85		if (sunrpc) {
86			pname = "(Sun RPC)";
87		} else {
88			pname = getportname(IPPROTO_UDP, ntohs(udp->uh_dport));
89			if (pname == NULL) {
90				pname = "";
91			} else {
92				(void) sprintf(buff, "(%s)", pname);
93				pname = buff;
94			}
95		}
96		(void) sprintf(get_line((char *)(uintptr_t)udp->uh_dport -
97		    dlc_header, 1), "Destination port = %d %s",
98		    ntohs(udp->uh_dport), pname);
99		(void) sprintf(get_line((char *)(uintptr_t)udp->uh_ulen -
100		    dlc_header, 1), "Length = %d %s",
101		    ntohs((ushort_t)udp->uh_ulen),
102		    udplen > fraglen ?
103			"(Not all data contained in this fragment)"
104			: "");
105		    (void) sprintf(get_line((char *)(uintptr_t)udp->uh_sum -
106			dlc_header, 1),	"Checksum = %04X %s",
107			ntohs(udp->uh_sum),
108			udp->uh_sum == 0 ? "(no checksum)" : "");
109		show_space();
110	}
111
112
113	/* go to the next protocol layer */
114
115	if (!interpret_reserved(flags, IPPROTO_UDP,
116		ntohs(udp->uh_sport),
117		ntohs(udp->uh_dport),
118		data, fraglen)) {
119		if (fraglen > 0 && sunrpc)
120			interpret_rpc(flags, data, fraglen, IPPROTO_UDP);
121	}
122
123	return (fraglen);
124}
125