The Tcpdump Group git mirrors - tcpdump/blob - print-ppp.c

   1 /*
   2  * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 #ifndef lint
  23 static const char rcsid[] =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.26 1999-10-07 23:47:12 mcr Exp $ (LBL)";
  25 #endif
  26
  27 #include <sys/param.h>
  28 #include <sys/time.h>
  29 #include <sys/socket.h>
  30 #include <sys/file.h>
  31 #include <sys/ioctl.h>
  32
  33 #if __STDC__
  34 struct mbuf;
  35 struct rtentry;
  36 #endif
  37 #include <net/if.h>
  38
  39 #include <netinet/in.h>
  40 #include <netinet/in_systm.h>
  41 #include <netinet/ip.h>
  42
  43 #include <ctype.h>
  44 #include <netdb.h>
  45 #include <pcap.h>
  46 #include <stdio.h>
  47
  48 #include "interface.h"
  49 #include "addrtoname.h"
  50 #include "ppp.h"
  51
  52 /* XXX This goes somewhere else. */
  53 #define PPP_HDRLEN 4
  54
  55 /* Standard PPP printer */
  56 void
  57 ppp_if_print(u_char *user, const struct pcap_pkthdr *h,
  58              register const u_char *p)
  59 {
  60         register u_int length = h->len;
  61         register u_int caplen = h->caplen;
  62         const struct ip *ip;
  63
  64         ts_print(&h->ts);
  65
  66         if (caplen < PPP_HDRLEN) {
  67                 printf("[|ppp]");
  68                 goto out;
  69         }
  70
  71         /*
  72          * Some printers want to get back at the link level addresses,
  73          * and/or check that they're not walking off the end of the packet.
  74          * Rather than pass them all the way down, we set these globals.
  75          */
  76         packetp = p;
  77         snapend = p + caplen;
  78
  79         if (eflag)
  80                 printf("%c %4d %02x %04x: ", p[0] ? 'O' : 'I', length,
  81                        p[1], ntohs(*(u_short *)&p[2]));
  82
  83         length -= PPP_HDRLEN;
  84         ip = (struct ip *)(p + PPP_HDRLEN);
  85         ip_print((const u_char *)ip, length);
  86
  87         if (xflag)
  88                 default_print((const u_char *)ip, caplen - PPP_HDRLEN);
  89 out:
  90         putchar('\n');
  91 }
  92
  93 /* proto type to string mapping */
  94 static struct tok ptype2str[] = {
  95         { PPP_VJC,      "VJC" },
  96         { PPP_VJNC,     "VJNC" },
  97         { PPP_OSI,      "OSI" },
  98         { PPP_LCP,      "LCP" },
  99         { PPP_IPCP,     "IPCP" },
 100         { 0,            NULL }
 101 };
 102
 103 #define PPP_BSDI_HDRLEN 24
 104
 105 /* BSD/OS specific PPP printer */
 106 void
 107 ppp_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h,
 108              register const u_char *p)
 109 {
 110         register u_int length = h->len;
 111         register u_int caplen = h->caplen;
 112         register int hdrlength;
 113         u_short ptype;
 114
 115         ts_print(&h->ts);
 116
 117         if (caplen < PPP_BSDI_HDRLEN) {
 118                 printf("[|ppp]");
 119                 goto out;
 120         }
 121
 122         /*
 123          * Some printers want to get back at the link level addresses,
 124          * and/or check that they're not walking off the end of the packet.
 125          * Rather than pass them all the way down, we set these globals.
 126          */
 127         packetp = p;
 128         snapend = p + caplen;
 129         hdrlength = 0;
 130
 131         if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) {
 132                 if (eflag)
 133                         printf("%02x %02x ", p[0], p[1]);
 134                 p += 2;
 135                 hdrlength = 2;
 136         }
 137
 138         if (eflag)
 139                 printf("%d ", length);
 140         /* Retrieve the protocol type */
 141         if (*p & 01) {
 142                 /* Compressed protocol field */
 143                 ptype = *p;
 144                 if (eflag)
 145                         printf("%02x ", ptype);
 146                 p++;
 147                 hdrlength += 1;
 148         } else {
 149                 /* Un-compressed protocol field */
 150                 ptype = ntohs(*(u_short *)p);
 151                 if (eflag)
 152                         printf("%04x ", ptype);
 153                 p += 2;
 154                 hdrlength += 2;
 155         }
 156
 157         length -= hdrlength;
 158
 159         if (ptype == PPP_IP)
 160                 ip_print(p, length);
 161         else
 162                 printf("%s ", tok2str(ptype2str, "proto-#%d", ptype));
 163
 164         if (xflag)
 165                 default_print((const u_char *)p, caplen - hdrlength);
 166 out:
 167         putchar('\n');
 168 }