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 #include <stdio.h> 28 #include <ctype.h> 29 #include <string.h> 30 #include <fcntl.h> 31 #include <string.h> 32 #include <sys/types.h> 33 #include <sys/time.h> 34 35 #include <sys/socket.h> 36 #include <sys/sockio.h> 37 #include <net/if.h> 38 #include <netinet/in_systm.h> 39 #include <netinet/in.h> 40 #include <netinet/ip.h> 41 #include <netinet/if_ether.h> 42 #include <netinet/udp.h> 43 #include "snoop.h" 44 45 extern char *dlc_header; 46 47 int 48 interpret_udp(int flags, struct udphdr *udp, int iplen, int fraglen) 49 { 50 char *data; 51 int udplen; 52 int sunrpc; 53 char *pname; 54 char buff [32]; 55 56 if (fraglen < sizeof (struct udphdr)) 57 return (fraglen); /* incomplete header */ 58 59 data = (char *)udp + sizeof (struct udphdr); 60 udplen = ntohs((ushort_t)udp->uh_ulen) - sizeof (struct udphdr); 61 fraglen -= sizeof (struct udphdr); 62 if (fraglen > udplen) 63 fraglen = udplen; 64 65 if (flags & F_SUM) { 66 (void) sprintf(get_sum_line(), 67 "UDP D=%d S=%d LEN=%d", 68 ntohs(udp->uh_dport), 69 ntohs(udp->uh_sport), 70 ntohs((ushort_t)udp->uh_ulen)); 71 } 72 73 sunrpc = !reservedport(IPPROTO_UDP, ntohs(udp->uh_dport)) && 74 !reservedport(IPPROTO_UDP, ntohs(udp->uh_sport)) && 75 valid_rpc(data, udplen); 76 77 if (flags & F_DTAIL) { 78 show_header("UDP: ", "UDP Header", udplen); 79 show_space(); 80 (void) sprintf(get_line((char *)(uintptr_t)udp->uh_sport - 81 dlc_header, 1), "Source port = %d", ntohs(udp->uh_sport)); 82 83 if (sunrpc) { 84 pname = "(Sun RPC)"; 85 } else { 86 pname = getportname(IPPROTO_UDP, ntohs(udp->uh_dport)); 87 if (pname == NULL) { 88 pname = ""; 89 } else { 90 (void) sprintf(buff, "(%s)", pname); 91 pname = buff; 92 } 93 } 94 (void) sprintf(get_line((char *)(uintptr_t)udp->uh_dport - 95 dlc_header, 1), "Destination port = %d %s", 96 ntohs(udp->uh_dport), pname); 97 (void) sprintf(get_line((char *)(uintptr_t)udp->uh_ulen - 98 dlc_header, 1), "Length = %d %s", 99 ntohs((ushort_t)udp->uh_ulen), 100 udplen > fraglen ? 101 "(Not all data contained in this fragment)" 102 : ""); 103 (void) sprintf(get_line((char *)(uintptr_t)udp->uh_sum - 104 dlc_header, 1), "Checksum = %04X %s", 105 ntohs(udp->uh_sum), 106 udp->uh_sum == 0 ? "(no checksum)" : ""); 107 show_space(); 108 } 109 110 111 /* go to the next protocol layer */ 112 113 if (!interpret_reserved(flags, IPPROTO_UDP, 114 ntohs(udp->uh_sport), 115 ntohs(udp->uh_dport), 116 data, fraglen)) { 117 if (fraglen > 0 && sunrpc) 118 interpret_rpc(flags, data, fraglen, IPPROTO_UDP); 119 } 120 121 return (fraglen); 122 } 123