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 | #ifndef lint |
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25 | static const char rcsid[] _U_ = |
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26 | "@(#) $Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.43 2005-11-29 08:56:19 hannes Exp $ (LBL)"; |
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27 | #endif |
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28 | |
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29 | #ifdef HAVE_CONFIG_H |
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30 | #include "config.h" |
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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 | #include "ethertype.h" |
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41 | #include "extract.h" |
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42 | #include "ppp.h" |
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43 | #include "chdlc.h" |
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44 | |
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45 | static void chdlc_slarp_print(const u_char *, u_int); |
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46 | |
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47 | const struct tok chdlc_cast_values[] = { |
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48 | { CHDLC_UNICAST, "unicast" }, |
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49 | { CHDLC_BCAST, "bcast" }, |
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50 | { 0, NULL} |
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51 | }; |
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52 | |
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53 | |
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54 | /* Standard CHDLC printer */ |
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55 | u_int |
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56 | chdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p) |
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57 | { |
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58 | register u_int length = h->len; |
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59 | register u_int caplen = h->caplen; |
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60 | |
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61 | if (caplen < CHDLC_HDRLEN) { |
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62 | printf("[|chdlc]"); |
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63 | return (caplen); |
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64 | } |
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65 | return (chdlc_print(p,length)); |
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66 | } |
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67 | |
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68 | u_int |
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69 | chdlc_print(register const u_char *p, u_int length) { |
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70 | u_int proto; |
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71 | |
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72 | proto = EXTRACT_16BITS(&p[2]); |
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73 | if (eflag) { |
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74 | printf("%s, ethertype %s (0x%04x), length %u: ", |
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75 | tok2str(chdlc_cast_values, "0x%02x", p[0]), |
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76 | tok2str(ethertype_values, "Unknown", proto), |
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77 | proto, |
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78 | length); |
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79 | } |
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80 | |
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81 | length -= CHDLC_HDRLEN; |
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82 | p += CHDLC_HDRLEN; |
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83 | |
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84 | switch (proto) { |
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85 | case ETHERTYPE_IP: |
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86 | ip_print(gndo, p, length); |
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87 | break; |
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88 | #ifdef INET6 |
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89 | case ETHERTYPE_IPV6: |
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90 | ip6_print(gndo, p, length); |
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91 | break; |
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92 | #endif |
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93 | case CHDLC_TYPE_SLARP: |
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94 | chdlc_slarp_print(p, length); |
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95 | break; |
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96 | #if 0 |
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97 | case CHDLC_TYPE_CDP: |
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98 | chdlc_cdp_print(p, length); |
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99 | break; |
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100 | #endif |
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101 | case ETHERTYPE_MPLS: |
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102 | case ETHERTYPE_MPLS_MULTI: |
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103 | mpls_print(p, length); |
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104 | break; |
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105 | case ETHERTYPE_ISO: |
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106 | /* is the fudge byte set ? lets verify by spotting ISO headers */ |
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107 | if (*(p+1) == 0x81 || |
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108 | *(p+1) == 0x82 || |
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109 | *(p+1) == 0x83) |
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110 | isoclns_print(p+1, length-1, length-1); |
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111 | else |
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112 | isoclns_print(p, length, length); |
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113 | break; |
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114 | default: |
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115 | if (!eflag) |
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116 | printf("unknown CHDLC protocol (0x%04x)", proto); |
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117 | break; |
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118 | } |
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119 | |
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120 | return (CHDLC_HDRLEN); |
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121 | } |
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122 | |
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123 | /* |
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124 | * The fixed-length portion of a SLARP packet. |
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125 | */ |
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126 | struct cisco_slarp { |
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127 | u_int8_t code[4]; |
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128 | #define SLARP_REQUEST 0 |
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129 | #define SLARP_REPLY 1 |
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130 | #define SLARP_KEEPALIVE 2 |
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131 | union { |
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132 | struct { |
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133 | u_int8_t addr[4]; |
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134 | u_int8_t mask[4]; |
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135 | } addr; |
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136 | struct { |
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137 | u_int8_t myseq[4]; |
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138 | u_int8_t yourseq[4]; |
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139 | u_int8_t rel[2]; |
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140 | } keep; |
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141 | } un; |
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142 | }; |
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143 | |
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144 | #define SLARP_MIN_LEN 14 |
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145 | #define SLARP_MAX_LEN 18 |
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146 | |
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147 | static void |
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148 | chdlc_slarp_print(const u_char *cp, u_int length) |
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149 | { |
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150 | const struct cisco_slarp *slarp; |
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151 | u_int sec,min,hrs,days; |
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152 | |
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153 | printf("SLARP (length: %u), ",length); |
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154 | if (length < SLARP_MIN_LEN) |
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155 | goto trunc; |
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156 | |
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157 | slarp = (const struct cisco_slarp *)cp; |
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158 | TCHECK2(*slarp, SLARP_MIN_LEN); |
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159 | switch (EXTRACT_32BITS(&slarp->code)) { |
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160 | case SLARP_REQUEST: |
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161 | printf("request"); |
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162 | /* |
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163 | * At least according to William "Chops" Westfield's |
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164 | * message in |
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165 | * |
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166 | * http://www.nethelp.no/net/cisco-hdlc.txt |
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167 | * |
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168 | * the address and mask aren't used in requests - |
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169 | * they're just zero. |
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170 | */ |
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171 | break; |
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172 | case SLARP_REPLY: |
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173 | printf("reply %s/%s", |
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174 | ipaddr_string(&slarp->un.addr.addr), |
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175 | ipaddr_string(&slarp->un.addr.mask)); |
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176 | break; |
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177 | case SLARP_KEEPALIVE: |
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178 | printf("keepalive: mineseen=0x%08x, yourseen=0x%08x, reliability=0x%04x", |
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179 | EXTRACT_32BITS(&slarp->un.keep.myseq), |
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180 | EXTRACT_32BITS(&slarp->un.keep.yourseq), |
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181 | EXTRACT_16BITS(&slarp->un.keep.rel)); |
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182 | |
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183 | if (length >= SLARP_MAX_LEN) { /* uptime-stamp is optional */ |
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184 | cp += SLARP_MIN_LEN; |
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185 | if (!TTEST2(*cp, 4)) |
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186 | goto trunc; |
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187 | sec = EXTRACT_32BITS(cp) / 1000; |
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188 | min = sec / 60; sec -= min * 60; |
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189 | hrs = min / 60; min -= hrs * 60; |
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190 | days = hrs / 24; hrs -= days * 24; |
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191 | printf(", link uptime=%ud%uh%um%us",days,hrs,min,sec); |
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192 | } |
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193 | break; |
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194 | default: |
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195 | printf("0x%02x unknown", EXTRACT_32BITS(&slarp->code)); |
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196 | if (vflag <= 1) |
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197 | print_unknown_data(cp+4,"\n\t",length-4); |
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198 | break; |
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199 | } |
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200 | |
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201 | if (SLARP_MAX_LEN < length && vflag) |
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202 | printf(", (trailing junk: %d bytes)", length - SLARP_MAX_LEN); |
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203 | if (vflag > 1) |
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204 | print_unknown_data(cp+4,"\n\t",length-4); |
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205 | return; |
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206 | |
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207 | trunc: |
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208 | printf("[|slarp]"); |
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209 | } |
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210 | |
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211 | |
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212 | /* |
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213 | * Local Variables: |
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214 | * c-style: whitesmith |
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215 | * c-basic-offset: 8 |
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216 | * End: |
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217 | */ |
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