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