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
47 extern char *dlc_header;
48
49 int
interpret_udp(int flags,struct udphdr * udp,int iplen,int fraglen)50 interpret_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