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 (c) 2001 by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 #ident "%Z%%M% %I% %E% SMI" /* SunOS */ 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 interpret_udp(flags, udp, iplen, fraglen) 50 int flags; 51 struct udphdr *udp; 52 int iplen, fraglen; 53 { 54 char *data; 55 int udplen; 56 int sunrpc; 57 char *pname; 58 char buff [32]; 59 60 if (fraglen < sizeof (struct udphdr)) 61 return (fraglen); /* incomplete header */ 62 63 data = (char *)udp + sizeof (struct udphdr); 64 udplen = ntohs((u_short)udp->uh_ulen) - sizeof (struct udphdr); 65 fraglen -= sizeof (struct udphdr); 66 if (fraglen > udplen) 67 fraglen = udplen; 68 69 if (flags & F_SUM) { 70 (void) sprintf(get_sum_line(), 71 "UDP D=%d S=%d LEN=%d", 72 ntohs(udp->uh_dport), 73 ntohs(udp->uh_sport), 74 ntohs((u_short)udp->uh_ulen)); 75 } 76 77 sunrpc = !reservedport(IPPROTO_UDP, ntohs(udp->uh_dport)) && 78 !reservedport(IPPROTO_UDP, ntohs(udp->uh_sport)) && 79 valid_rpc(data, udplen); 80 81 if (flags & F_DTAIL) { 82 show_header("UDP: ", "UDP Header", udplen); 83 show_space(); 84 (void) sprintf(get_line((char *)udp->uh_sport - dlc_header, 1), 85 "Source port = %d", 86 ntohs(udp->uh_sport)); 87 88 if (sunrpc) { 89 pname = "(Sun RPC)"; 90 } else { 91 pname = getportname(IPPROTO_UDP, ntohs(udp->uh_dport)); 92 if (pname == NULL) { 93 pname = ""; 94 } else { 95 (void) sprintf(buff, "(%s)", pname); 96 pname = buff; 97 } 98 } 99 (void) sprintf(get_line((char *)udp->uh_dport - dlc_header, 1), 100 "Destination port = %d %s", 101 ntohs(udp->uh_dport), pname); 102 (void) sprintf(get_line((char *)udp->uh_ulen - dlc_header, 1), 103 "Length = %d %s", 104 ntohs((u_short)udp->uh_ulen), 105 udplen > fraglen ? 106 "(Not all data contained in this fragment)" 107 : ""); 108 (void) sprintf( 109 get_line((char *)udp->uh_sum - dlc_header, 1), 110 "Checksum = %04X %s", 111 ntohs(udp->uh_sum), 112 udp->uh_sum == 0 ? "(no checksum)" : ""); 113 show_space(); 114 } 115 116 117 /* go to the next protocol layer */ 118 119 if (!interpret_reserved(flags, IPPROTO_UDP, 120 ntohs(udp->uh_sport), 121 ntohs(udp->uh_dport), 122 data, fraglen)) { 123 if (fraglen > 0 && sunrpc) 124 interpret_rpc(flags, data, fraglen, IPPROTO_UDP); 125 } 126 127 return (fraglen); 128 } 129