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) 1995, 1996 |
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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-dvmrp.c,v 1.27 2003-11-19 09:42:04 guy 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 <stdio.h> |
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36 | #include <string.h> |
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37 | #include <stdlib.h> |
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38 | |
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39 | #include "interface.h" |
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40 | #include "extract.h" |
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41 | #include "addrtoname.h" |
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42 | |
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43 | /* |
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44 | * DVMRP message types and flag values shamelessly stolen from |
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45 | * mrouted/dvmrp.h. |
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46 | */ |
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47 | #define DVMRP_PROBE 1 /* for finding neighbors */ |
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48 | #define DVMRP_REPORT 2 /* for reporting some or all routes */ |
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49 | #define DVMRP_ASK_NEIGHBORS 3 /* sent by mapper, asking for a list */ |
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50 | /* of this router's neighbors */ |
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51 | #define DVMRP_NEIGHBORS 4 /* response to such a request */ |
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52 | #define DVMRP_ASK_NEIGHBORS2 5 /* as above, want new format reply */ |
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53 | #define DVMRP_NEIGHBORS2 6 |
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54 | #define DVMRP_PRUNE 7 /* prune message */ |
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55 | #define DVMRP_GRAFT 8 /* graft message */ |
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56 | #define DVMRP_GRAFT_ACK 9 /* graft acknowledgement */ |
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57 | |
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58 | /* |
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59 | * 'flags' byte values in DVMRP_NEIGHBORS2 reply. |
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60 | */ |
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61 | #define DVMRP_NF_TUNNEL 0x01 /* neighbors reached via tunnel */ |
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62 | #define DVMRP_NF_SRCRT 0x02 /* tunnel uses IP source routing */ |
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63 | #define DVMRP_NF_DOWN 0x10 /* kernel state of interface */ |
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64 | #define DVMRP_NF_DISABLED 0x20 /* administratively disabled */ |
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65 | #define DVMRP_NF_QUERIER 0x40 /* I am the subnet's querier */ |
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66 | |
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67 | static int print_probe(const u_char *, const u_char *, u_int); |
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68 | static int print_report(const u_char *, const u_char *, u_int); |
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69 | static int print_neighbors(const u_char *, const u_char *, u_int); |
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70 | static int print_neighbors2(const u_char *, const u_char *, u_int); |
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71 | static int print_prune(const u_char *); |
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72 | static int print_graft(const u_char *); |
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73 | static int print_graft_ack(const u_char *); |
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74 | |
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75 | static u_int32_t target_level; |
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76 | |
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77 | void |
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78 | dvmrp_print(register const u_char *bp, register u_int len) |
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79 | { |
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80 | register const u_char *ep; |
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81 | register u_char type; |
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82 | |
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83 | ep = (const u_char *)snapend; |
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84 | if (bp >= ep) |
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85 | return; |
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86 | |
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87 | TCHECK(bp[1]); |
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88 | type = bp[1]; |
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89 | |
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90 | /* Skip IGMP header */ |
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91 | bp += 8; |
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92 | len -= 8; |
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93 | |
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94 | switch (type) { |
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95 | |
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96 | case DVMRP_PROBE: |
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97 | printf(" Probe"); |
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98 | if (vflag) { |
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99 | if (print_probe(bp, ep, len) < 0) |
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100 | goto trunc; |
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101 | } |
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102 | break; |
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103 | |
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104 | case DVMRP_REPORT: |
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105 | printf(" Report"); |
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106 | if (vflag > 1) { |
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107 | if (print_report(bp, ep, len) < 0) |
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108 | goto trunc; |
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109 | } |
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110 | break; |
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111 | |
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112 | case DVMRP_ASK_NEIGHBORS: |
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113 | printf(" Ask-neighbors(old)"); |
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114 | break; |
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115 | |
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116 | case DVMRP_NEIGHBORS: |
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117 | printf(" Neighbors(old)"); |
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118 | if (print_neighbors(bp, ep, len) < 0) |
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119 | goto trunc; |
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120 | break; |
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121 | |
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122 | case DVMRP_ASK_NEIGHBORS2: |
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123 | printf(" Ask-neighbors2"); |
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124 | break; |
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125 | |
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126 | case DVMRP_NEIGHBORS2: |
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127 | printf(" Neighbors2"); |
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128 | /* |
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129 | * extract version and capabilities from IGMP group |
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130 | * address field |
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131 | */ |
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132 | bp -= 4; |
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133 | TCHECK2(bp[0], 4); |
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134 | target_level = (bp[0] << 24) | (bp[1] << 16) | |
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135 | (bp[2] << 8) | bp[3]; |
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136 | bp += 4; |
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137 | if (print_neighbors2(bp, ep, len) < 0) |
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138 | goto trunc; |
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139 | break; |
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140 | |
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141 | case DVMRP_PRUNE: |
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142 | printf(" Prune"); |
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143 | if (print_prune(bp) < 0) |
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144 | goto trunc; |
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145 | break; |
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146 | |
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147 | case DVMRP_GRAFT: |
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148 | printf(" Graft"); |
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149 | if (print_graft(bp) < 0) |
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150 | goto trunc; |
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151 | break; |
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152 | |
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153 | case DVMRP_GRAFT_ACK: |
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154 | printf(" Graft-ACK"); |
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155 | if (print_graft_ack(bp) < 0) |
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156 | goto trunc; |
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157 | break; |
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158 | |
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159 | default: |
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160 | printf(" [type %d]", type); |
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161 | break; |
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162 | } |
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163 | return; |
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164 | |
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165 | trunc: |
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166 | printf("[|dvmrp]"); |
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167 | return; |
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168 | } |
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169 | |
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170 | static int |
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171 | print_report(register const u_char *bp, register const u_char *ep, |
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172 | register u_int len) |
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173 | { |
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174 | register u_int32_t mask, origin; |
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175 | register int metric, done; |
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176 | register u_int i, width; |
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177 | |
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178 | while (len > 0) { |
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179 | if (len < 3) { |
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180 | printf(" [|]"); |
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181 | return (0); |
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182 | } |
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183 | TCHECK2(bp[0], 3); |
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184 | mask = (u_int32_t)0xff << 24 | bp[0] << 16 | bp[1] << 8 | bp[2]; |
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185 | width = 1; |
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186 | if (bp[0]) |
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187 | width = 2; |
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188 | if (bp[1]) |
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189 | width = 3; |
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190 | if (bp[2]) |
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191 | width = 4; |
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192 | |
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193 | printf("\n\tMask %s", intoa(htonl(mask))); |
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194 | bp += 3; |
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195 | len -= 3; |
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196 | do { |
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197 | if (bp + width + 1 > ep) { |
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198 | printf(" [|]"); |
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199 | return (0); |
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200 | } |
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201 | if (len < width + 1) { |
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202 | printf("\n\t [Truncated Report]"); |
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203 | return (0); |
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204 | } |
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205 | origin = 0; |
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206 | for (i = 0; i < width; ++i) { |
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207 | TCHECK(*bp); |
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208 | origin = origin << 8 | *bp++; |
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209 | } |
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210 | for ( ; i < 4; ++i) |
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211 | origin <<= 8; |
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212 | |
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213 | TCHECK(*bp); |
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214 | metric = *bp++; |
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215 | done = metric & 0x80; |
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216 | metric &= 0x7f; |
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217 | printf("\n\t %s metric %d", intoa(htonl(origin)), |
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218 | metric); |
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219 | len -= width + 1; |
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220 | } while (!done); |
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221 | } |
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222 | return (0); |
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223 | trunc: |
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224 | return (-1); |
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225 | } |
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226 | |
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227 | static int |
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228 | print_probe(register const u_char *bp, register const u_char *ep, |
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229 | register u_int len) |
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230 | { |
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231 | register u_int32_t genid; |
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232 | |
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233 | TCHECK2(bp[0], 4); |
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234 | if ((len < 4) || ((bp + 4) > ep)) { |
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235 | /* { (ctags) */ |
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236 | printf(" [|}"); |
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237 | return (0); |
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238 | } |
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239 | genid = (bp[0] << 24) | (bp[1] << 16) | (bp[2] << 8) | bp[3]; |
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240 | bp += 4; |
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241 | len -= 4; |
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242 | if (vflag > 1) |
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243 | printf("\n\t"); |
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244 | else |
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245 | printf(" "); |
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246 | printf("genid %u", genid); |
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247 | if (vflag < 2) |
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248 | return (0); |
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249 | |
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250 | while ((len > 0) && (bp < ep)) { |
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251 | TCHECK2(bp[0], 4); |
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252 | printf("\n\tneighbor %s", ipaddr_string(bp)); |
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253 | bp += 4; len -= 4; |
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254 | } |
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255 | return (0); |
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256 | trunc: |
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257 | return (-1); |
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258 | } |
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259 | |
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260 | static int |
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261 | print_neighbors(register const u_char *bp, register const u_char *ep, |
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262 | register u_int len) |
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263 | { |
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264 | const u_char *laddr; |
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265 | register u_char metric; |
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266 | register u_char thresh; |
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267 | register int ncount; |
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268 | |
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269 | while (len > 0 && bp < ep) { |
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270 | TCHECK2(bp[0], 7); |
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271 | laddr = bp; |
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272 | bp += 4; |
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273 | metric = *bp++; |
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274 | thresh = *bp++; |
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275 | ncount = *bp++; |
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276 | len -= 7; |
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277 | while (--ncount >= 0) { |
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278 | TCHECK2(bp[0], 4); |
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279 | printf(" [%s ->", ipaddr_string(laddr)); |
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280 | printf(" %s, (%d/%d)]", |
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281 | ipaddr_string(bp), metric, thresh); |
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282 | bp += 4; |
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283 | len -= 4; |
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284 | } |
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285 | } |
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286 | return (0); |
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287 | trunc: |
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288 | return (-1); |
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289 | } |
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290 | |
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291 | static int |
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292 | print_neighbors2(register const u_char *bp, register const u_char *ep, |
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293 | register u_int len) |
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294 | { |
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295 | const u_char *laddr; |
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296 | register u_char metric, thresh, flags; |
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297 | register int ncount; |
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298 | |
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299 | printf(" (v %d.%d):", |
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300 | (int)target_level & 0xff, |
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301 | (int)(target_level >> 8) & 0xff); |
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302 | |
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303 | while (len > 0 && bp < ep) { |
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304 | TCHECK2(bp[0], 8); |
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305 | laddr = bp; |
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306 | bp += 4; |
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307 | metric = *bp++; |
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308 | thresh = *bp++; |
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309 | flags = *bp++; |
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310 | ncount = *bp++; |
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311 | len -= 8; |
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312 | while (--ncount >= 0 && (len >= 4) && (bp + 4) <= ep) { |
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313 | printf(" [%s -> ", ipaddr_string(laddr)); |
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314 | printf("%s (%d/%d", ipaddr_string(bp), |
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315 | metric, thresh); |
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316 | if (flags & DVMRP_NF_TUNNEL) |
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317 | printf("/tunnel"); |
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318 | if (flags & DVMRP_NF_SRCRT) |
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319 | printf("/srcrt"); |
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320 | if (flags & DVMRP_NF_QUERIER) |
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321 | printf("/querier"); |
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322 | if (flags & DVMRP_NF_DISABLED) |
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323 | printf("/disabled"); |
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324 | if (flags & DVMRP_NF_DOWN) |
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325 | printf("/down"); |
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326 | printf(")]"); |
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327 | bp += 4; |
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328 | len -= 4; |
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329 | } |
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330 | if (ncount != -1) { |
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331 | printf(" [|]"); |
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332 | return (0); |
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333 | } |
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334 | } |
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335 | return (0); |
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336 | trunc: |
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337 | return (-1); |
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338 | } |
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339 | |
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340 | static int |
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341 | print_prune(register const u_char *bp) |
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342 | { |
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343 | TCHECK2(bp[0], 12); |
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344 | printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4)); |
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345 | bp += 8; |
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346 | (void)printf(" timer "); |
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347 | relts_print(EXTRACT_32BITS(bp)); |
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348 | return (0); |
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349 | trunc: |
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350 | return (-1); |
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351 | } |
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352 | |
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353 | static int |
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354 | print_graft(register const u_char *bp) |
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355 | { |
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356 | TCHECK2(bp[0], 8); |
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357 | printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4)); |
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358 | return (0); |
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359 | trunc: |
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360 | return (-1); |
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361 | } |
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362 | |
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363 | static int |
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364 | print_graft_ack(register const u_char *bp) |
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365 | { |
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366 | TCHECK2(bp[0], 8); |
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367 | printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4)); |
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368 | return (0); |
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369 | trunc: |
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370 | return (-1); |
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371 | } |
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