tcpdump.tproj/print-ether.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that: (1) source code distributions
  30  * retain the above copyright notice and this paragraph in its entirety, (2)
  31  * distributions including binary code include the above copyright notice and
  32  * this paragraph in its entirety in the documentation or other materials
  33  * provided with the distribution, and (3) all advertising materials mentioning
  34  * features or use of this software display the following acknowledgement:
  35  * ``This product includes software developed by the University of California,
  36  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  37  * the University nor the names of its contributors may be used to endorse
  38  * or promote products derived from this software without specific prior
  39  * written permission.
  40  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  41  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  42  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  43  */
  44 #ifndef lint
  45 static const char rcsid[] =
  46     "@(#) $Header: /cvs/Darwin/Commands/NeXT/network_cmds/tcpdump.tproj/print-ether.c,v 1.1.1.1 1999/05/02 03:58:33 wsanchez Exp $ (LBL)";
  47 #endif
  48
  49 #include <sys/param.h>
  50 #include <sys/time.h>
  51 #include <sys/socket.h>
  52
  53 #if __STDC__
  54 struct mbuf;
  55 struct rtentry;
  56 #endif
  57 #include <net/if.h>
  58
  59 #include <netinet/in.h>
  60 #include <netinet/if_ether.h>
  61 #include <netinet/in_systm.h>
  62 #include <netinet/ip.h>
  63 #include <netinet/ip_var.h>
  64 #include <netinet/udp.h>
  65 #include <netinet/udp_var.h>
  66 #include <netinet/tcp.h>
  67 #include <netinet/tcpip.h>
  68
  69 #include <stdio.h>
  70 #include <pcap.h>
  71
  72 #include "interface.h"
  73 #include "addrtoname.h"
  74 #include "ethertype.h"
  75
  76 const u_char *packetp;
  77 const u_char *snapend;
  78
  79 static inline void
  80 ether_print(register const u_char *bp, u_int length)
  81 {
  82         register const struct ether_header *ep;
  83
  84         ep = (const struct ether_header *)bp;
  85         if (qflag)
  86                 (void)printf("%s %s %d: ",
  87                              etheraddr_string(ESRC(ep)),
  88                              etheraddr_string(EDST(ep)),
  89                              length);
  90         else
  91                 (void)printf("%s %s %s %d: ",
  92                              etheraddr_string(ESRC(ep)),
  93                              etheraddr_string(EDST(ep)),
  94                              etherproto_string(ep->ether_type),
  95                              length);
  96 }
  97
  98 /*
  99  * This is the top level routine of the printer.  'p' is the points
 100  * to the ether header of the packet, 'tvp' is the timestamp,
 101  * 'length' is the length of the packet off the wire, and 'caplen'
 102  * is the number of bytes actually captured.
 103  */
 104 void
 105 ether_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 106 {
 107         u_int caplen = h->caplen;
 108         u_int length = h->len;
 109         struct ether_header *ep;
 110         u_short ether_type;
 111         extern u_short extracted_ethertype;
 112
 113         ts_print(&h->ts);
 114
 115         if (caplen < sizeof(struct ether_header)) {
 116                 printf("[|ether]");
 117                 goto out;
 118         }
 119
 120         if (eflag)
 121                 ether_print(p, length);
 122
 123         /*
 124          * Some printers want to get back at the ethernet addresses,
 125          * and/or check that they're not walking off the end of the packet.
 126          * Rather than pass them all the way down, we set these globals.
 127          */
 128         packetp = p;
 129         snapend = p + caplen;
 130
 131         length -= sizeof(struct ether_header);
 132         caplen -= sizeof(struct ether_header);
 133         ep = (struct ether_header *)p;
 134         p += sizeof(struct ether_header);
 135
 136         ether_type = ntohs(ep->ether_type);
 137
 138         /*
 139          * Is it (gag) an 802.3 encapsulation?
 140          */
 141         extracted_ethertype = 0;
 142         if (ether_type < ETHERMTU) {
 143                 /* Try to print the LLC-layer header & higher layers */
 144                 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep)) == 0) {
 145                         /* ether_type not known, print raw packet */
 146                         if (!eflag)
 147                                 ether_print((u_char *)ep, length);
 148                         if (extracted_ethertype) {
 149                                 printf("(LLC %s) ",
 150                                etherproto_string(htons(extracted_ethertype)));
 151                         }
 152                         if (!xflag && !qflag)
 153                                 default_print(p, caplen);
 154                 }
 155         } else if (ether_encap_print(ether_type, p, length, caplen) == 0) {
 156                 /* ether_type not known, print raw packet */
 157                 if (!eflag)
 158                         ether_print((u_char *)ep, length + sizeof(*ep));
 159                 if (!xflag && !qflag)
 160                         default_print(p, caplen);
 161         }
 162         if (xflag)
 163                 default_print(p, caplen);
 164  out:
 165         putchar('\n');
 166 }
 167
 168 /*
 169  * Prints the packet encapsulated in an Ethernet data segment
 170  * (or an equivalent encapsulation), given the Ethernet type code.
 171  *
 172  * Returns non-zero if it can do so, zero if the ethertype is unknown.
 173  *
 174  * Stuffs the ether type into a global for the benefit of lower layers
 175  * that might want to know what it is.
 176  */
 177
 178 u_short extracted_ethertype;
 179
 180 int
 181 ether_encap_print(u_short ethertype, const u_char *p,
 182     u_int length, u_int caplen)
 183 {
 184         extracted_ethertype = ethertype;
 185
 186         switch (ethertype) {
 187
 188         case ETHERTYPE_IP:
 189                 ip_print(p, length);
 190                 return (1);
 191
 192         case ETHERTYPE_ARP:
 193         case ETHERTYPE_REVARP:
 194                 arp_print(p, length, caplen);
 195                 return (1);
 196
 197         case ETHERTYPE_DN:
 198                 decnet_print(p, length, caplen);
 199                 return (1);
 200
 201         case ETHERTYPE_ATALK:
 202                 if (vflag)
 203                         fputs("et1 ", stdout);
 204                 atalk_print(p, length);
 205                 return (1);
 206
 207         case ETHERTYPE_AARP:
 208                 aarp_print(p, length);
 209                 return (1);
 210
 211         case ETHERTYPE_LAT:
 212         case ETHERTYPE_SCA:
 213         case ETHERTYPE_MOPRC:
 214         case ETHERTYPE_MOPDL:
 215                 /* default_print for now */
 216         default:
 217                 return (0);
 218         }
 219 }