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 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