1 | #include <machine/rtems-bsd-user-space.h> |
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2 | |
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3 | /* |
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4 | * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997 |
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5 | * The Regents of the University of California. All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that: (1) source code distributions |
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9 | * retain the above copyright notice and this paragraph in its entirety, (2) |
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10 | * distributions including binary code include the above copyright notice and |
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11 | * this paragraph in its entirety in the documentation or other materials |
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12 | * provided with the distribution, and (3) all advertising materials mentioning |
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13 | * features or use of this software display the following acknowledgement: |
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14 | * ``This product includes software developed by the University of California, |
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15 | * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
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16 | * the University nor the names of its contributors may be used to endorse |
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17 | * or promote products derived from this software without specific prior |
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18 | * written permission. |
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19 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
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20 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
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21 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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22 | */ |
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23 | |
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24 | #ifdef HAVE_CONFIG_H |
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25 | #include "config.h" |
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26 | #endif |
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27 | |
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28 | #ifndef lint |
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29 | static const char rcsid[] _U_ = |
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30 | "@(#) $Header: /tcpdump/master/tcpdump/print-vjc.c,v 1.15 2004-03-25 03:31:17 mcr Exp $ (LBL)"; |
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31 | #endif |
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32 | |
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33 | #include <tcpdump-stdinc.h> |
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34 | |
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35 | #include <pcap.h> |
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36 | #include <stdio.h> |
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37 | |
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38 | #include "interface.h" |
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39 | #include "addrtoname.h" |
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40 | |
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41 | #include "slcompress.h" |
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42 | #include "ppp.h" |
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43 | |
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44 | /* |
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45 | * XXX - for BSD/OS PPP, what packets get supplied with a PPP header type |
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46 | * of PPP_VJC and what packets get supplied with a PPP header type of |
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47 | * PPP_VJNC? PPP_VJNC is for "UNCOMPRESSED_TCP" packets, and PPP_VJC |
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48 | * is for COMPRESSED_TCP packets (PPP_IP is used for TYPE_IP packets). |
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49 | * |
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50 | * RFC 1144 implies that, on the wire, the packet type is *not* needed |
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51 | * for PPP, as different PPP protocol types can be used; it only needs |
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52 | * to be put on the wire for SLIP. |
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53 | * |
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54 | * It also indicates that, for compressed SLIP: |
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55 | * |
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56 | * If the COMPRESSED_TCP bit is set in the first byte, it's |
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57 | * a COMPRESSED_TCP packet; that byte is the change byte, and |
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58 | * the COMPRESSED_TCP bit, 0x80, isn't used in the change byte. |
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59 | * |
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60 | * If the upper 4 bits of the first byte are 7, it's an |
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61 | * UNCOMPRESSED_TCP packet; that byte is the first byte of |
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62 | * the UNCOMPRESSED_TCP modified IP header, with a connection |
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63 | * number in the protocol field, and with the version field |
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64 | * being 7, not 4. |
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65 | * |
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66 | * Otherwise, the packet is an IPv4 packet (where the upper 4 bits |
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67 | * of the packet are 4). |
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68 | * |
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69 | * So this routine looks as if it's sort-of intended to handle |
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70 | * compressed SLIP, although it doesn't handle UNCOMPRESSED_TCP |
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71 | * correctly for that (it doesn't fix the version number and doesn't |
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72 | * do anything to the protocol field), and doesn't check for COMPRESSED_TCP |
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73 | * packets correctly for that (you only check the first bit - see |
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74 | * B.1 in RFC 1144). |
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75 | * |
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76 | * But it's called for BSD/OS PPP, not SLIP - perhaps BSD/OS does weird |
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77 | * things with the headers? |
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78 | * |
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79 | * Without a BSD/OS VJC-compressed PPP trace, or knowledge of what the |
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80 | * BSD/OS VJC code does, we can't say what's the case. |
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81 | * |
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82 | * We therefore leave "proto" - which is the PPP protocol type - in place, |
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83 | * *not* marked as unused, for now, so that GCC warnings about the |
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84 | * unused argument remind us that we should fix this some day. |
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85 | */ |
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86 | int |
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87 | vjc_print(register const char *bp, u_short proto _U_) |
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88 | { |
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89 | int i; |
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90 | |
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91 | switch (bp[0] & 0xf0) { |
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92 | case TYPE_IP: |
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93 | if (eflag) |
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94 | printf("(vjc type=IP) "); |
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95 | return PPP_IP; |
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96 | case TYPE_UNCOMPRESSED_TCP: |
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97 | if (eflag) |
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98 | printf("(vjc type=raw TCP) "); |
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99 | return PPP_IP; |
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100 | case TYPE_COMPRESSED_TCP: |
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101 | if (eflag) |
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102 | printf("(vjc type=compressed TCP) "); |
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103 | for (i = 0; i < 8; i++) { |
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104 | if (bp[1] & (0x80 >> i)) |
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105 | printf("%c", "?CI?SAWU"[i]); |
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106 | } |
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107 | if (bp[1]) |
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108 | printf(" "); |
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109 | printf("C=0x%02x ", bp[2]); |
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110 | printf("sum=0x%04x ", *(u_short *)&bp[3]); |
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111 | return -1; |
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112 | case TYPE_ERROR: |
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113 | if (eflag) |
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114 | printf("(vjc type=error) "); |
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115 | return -1; |
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116 | default: |
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117 | if (eflag) |
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118 | printf("(vjc type=0x%02x) ", bp[0] & 0xf0); |
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119 | return -1; |
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120 | } |
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121 | } |
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