| 1 | /* |
| 2 | * Copyright (c) 1995, 1996 |
| 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[] _U_ = |
| 24 | "@(#) $Header: /tcpdump/master/tcpdump/print-dvmrp.c,v 1.27 2003/11/19 09:42:04 guy Exp $ (LBL)"; |
| 25 | #endif |
| 26 | |
| 27 | #ifdef HAVE_CONFIG_H |
| 28 | #include "config.h" |
| 29 | #endif |
| 30 | |
| 31 | #include <tcpdump-stdinc.h> |
| 32 | |
| 33 | #include <stdio.h> |
| 34 | #include <string.h> |
| 35 | #include <stdlib.h> |
| 36 | |
| 37 | #include "interface.h" |
| 38 | #include "extract.h" |
| 39 | #include "addrtoname.h" |
| 40 | |
| 41 | /* |
| 42 | * DVMRP message types and flag values shamelessly stolen from |
| 43 | * mrouted/dvmrp.h. |
| 44 | */ |
| 45 | #define DVMRP_PROBE 1 /* for finding neighbors */ |
| 46 | #define DVMRP_REPORT 2 /* for reporting some or all routes */ |
| 47 | #define DVMRP_ASK_NEIGHBORS 3 /* sent by mapper, asking for a list */ |
| 48 | /* of this router's neighbors */ |
| 49 | #define DVMRP_NEIGHBORS 4 /* response to such a request */ |
| 50 | #define DVMRP_ASK_NEIGHBORS2 5 /* as above, want new format reply */ |
| 51 | #define DVMRP_NEIGHBORS2 6 |
| 52 | #define DVMRP_PRUNE 7 /* prune message */ |
| 53 | #define DVMRP_GRAFT 8 /* graft message */ |
| 54 | #define DVMRP_GRAFT_ACK 9 /* graft acknowledgement */ |
| 55 | |
| 56 | /* |
| 57 | * 'flags' byte values in DVMRP_NEIGHBORS2 reply. |
| 58 | */ |
| 59 | #define DVMRP_NF_TUNNEL 0x01 /* neighbors reached via tunnel */ |
| 60 | #define DVMRP_NF_SRCRT 0x02 /* tunnel uses IP source routing */ |
| 61 | #define DVMRP_NF_DOWN 0x10 /* kernel state of interface */ |
| 62 | #define DVMRP_NF_DISABLED 0x20 /* administratively disabled */ |
| 63 | #define DVMRP_NF_QUERIER 0x40 /* I am the subnet's querier */ |
| 64 | |
| 65 | static int print_probe(const u_char *, const u_char *, u_int); |
| 66 | static int print_report(const u_char *, const u_char *, u_int); |
| 67 | static int print_neighbors(const u_char *, const u_char *, u_int); |
| 68 | static int print_neighbors2(const u_char *, const u_char *, u_int); |
| 69 | static int print_prune(const u_char *); |
| 70 | static int print_graft(const u_char *); |
| 71 | static int print_graft_ack(const u_char *); |
| 72 | |
| 73 | static u_int32_t target_level; |
| 74 | |
| 75 | void |
| 76 | dvmrp_print(register const u_char *bp, register u_int len) |
| 77 | { |
| 78 | register const u_char *ep; |
| 79 | register u_char type; |
| 80 | |
| 81 | ep = (const u_char *)snapend; |
| 82 | if (bp >= ep) |
| 83 | return; |
| 84 | |
| 85 | TCHECK(bp[1]); |
| 86 | type = bp[1]; |
| 87 | |
| 88 | /* Skip IGMP header */ |
| 89 | bp += 8; |
| 90 | len -= 8; |
| 91 | |
| 92 | switch (type) { |
| 93 | |
| 94 | case DVMRP_PROBE: |
| 95 | printf(" Probe"); |
| 96 | if (vflag) { |
| 97 | if (print_probe(bp, ep, len) < 0) |
| 98 | goto trunc; |
| 99 | } |
| 100 | break; |
| 101 | |
| 102 | case DVMRP_REPORT: |
| 103 | printf(" Report"); |
| 104 | if (vflag > 1) { |
| 105 | if (print_report(bp, ep, len) < 0) |
| 106 | goto trunc; |
| 107 | } |
| 108 | break; |
| 109 | |
| 110 | case DVMRP_ASK_NEIGHBORS: |
| 111 | printf(" Ask-neighbors(old)"); |
| 112 | break; |
| 113 | |
| 114 | case DVMRP_NEIGHBORS: |
| 115 | printf(" Neighbors(old)"); |
| 116 | if (print_neighbors(bp, ep, len) < 0) |
| 117 | goto trunc; |
| 118 | break; |
| 119 | |
| 120 | case DVMRP_ASK_NEIGHBORS2: |
| 121 | printf(" Ask-neighbors2"); |
| 122 | break; |
| 123 | |
| 124 | case DVMRP_NEIGHBORS2: |
| 125 | printf(" Neighbors2"); |
| 126 | /* |
| 127 | * extract version and capabilities from IGMP group |
| 128 | * address field |
| 129 | */ |
| 130 | bp -= 4; |
| 131 | TCHECK2(bp[0], 4); |
| 132 | target_level = (bp[0] << 24) | (bp[1] << 16) | |
| 133 | (bp[2] << 8) | bp[3]; |
| 134 | bp += 4; |
| 135 | if (print_neighbors2(bp, ep, len) < 0) |
| 136 | goto trunc; |
| 137 | break; |
| 138 | |
| 139 | case DVMRP_PRUNE: |
| 140 | printf(" Prune"); |
| 141 | if (print_prune(bp) < 0) |
| 142 | goto trunc; |
| 143 | break; |
| 144 | |
| 145 | case DVMRP_GRAFT: |
| 146 | printf(" Graft"); |
| 147 | if (print_graft(bp) < 0) |
| 148 | goto trunc; |
| 149 | break; |
| 150 | |
| 151 | case DVMRP_GRAFT_ACK: |
| 152 | printf(" Graft-ACK"); |
| 153 | if (print_graft_ack(bp) < 0) |
| 154 | goto trunc; |
| 155 | break; |
| 156 | |
| 157 | default: |
| 158 | printf(" [type %d]", type); |
| 159 | break; |
| 160 | } |
| 161 | return; |
| 162 | |
| 163 | trunc: |
| 164 | printf("[|dvmrp]"); |
| 165 | return; |
| 166 | } |
| 167 | |
| 168 | static int |
| 169 | print_report(register const u_char *bp, register const u_char *ep, |
| 170 | register u_int len) |
| 171 | { |
| 172 | register u_int32_t mask, origin; |
| 173 | register int metric, done; |
| 174 | register u_int i, width; |
| 175 | |
| 176 | while (len > 0) { |
| 177 | if (len < 3) { |
| 178 | printf(" [|]"); |
| 179 | return (0); |
| 180 | } |
| 181 | TCHECK2(bp[0], 3); |
| 182 | mask = (u_int32_t)0xff << 24 | bp[0] << 16 | bp[1] << 8 | bp[2]; |
| 183 | width = 1; |
| 184 | if (bp[0]) |
| 185 | width = 2; |
| 186 | if (bp[1]) |
| 187 | width = 3; |
| 188 | if (bp[2]) |
| 189 | width = 4; |
| 190 | |
| 191 | printf("\n\tMask %s", intoa(htonl(mask))); |
| 192 | bp += 3; |
| 193 | len -= 3; |
| 194 | do { |
| 195 | if (bp + width + 1 > ep) { |
| 196 | printf(" [|]"); |
| 197 | return (0); |
| 198 | } |
| 199 | if (len < width + 1) { |
| 200 | printf("\n\t [Truncated Report]"); |
| 201 | return (0); |
| 202 | } |
| 203 | origin = 0; |
| 204 | for (i = 0; i < width; ++i) { |
| 205 | TCHECK(*bp); |
| 206 | origin = origin << 8 | *bp++; |
| 207 | } |
| 208 | for ( ; i < 4; ++i) |
| 209 | origin <<= 8; |
| 210 | |
| 211 | TCHECK(*bp); |
| 212 | metric = *bp++; |
| 213 | done = metric & 0x80; |
| 214 | metric &= 0x7f; |
| 215 | printf("\n\t %s metric %d", intoa(htonl(origin)), |
| 216 | metric); |
| 217 | len -= width + 1; |
| 218 | } while (!done); |
| 219 | } |
| 220 | return (0); |
| 221 | trunc: |
| 222 | return (-1); |
| 223 | } |
| 224 | |
| 225 | static int |
| 226 | print_probe(register const u_char *bp, register const u_char *ep, |
| 227 | register u_int len) |
| 228 | { |
| 229 | register u_int32_t genid; |
| 230 | |
| 231 | TCHECK2(bp[0], 4); |
| 232 | if ((len < 4) || ((bp + 4) > ep)) { |
| 233 | /* { (ctags) */ |
| 234 | printf(" [|}"); |
| 235 | return (0); |
| 236 | } |
| 237 | genid = (bp[0] << 24) | (bp[1] << 16) | (bp[2] << 8) | bp[3]; |
| 238 | bp += 4; |
| 239 | len -= 4; |
| 240 | if (vflag > 1) |
| 241 | printf("\n\t"); |
| 242 | else |
| 243 | printf(" "); |
| 244 | printf("genid %u", genid); |
| 245 | if (vflag < 2) |
| 246 | return (0); |
| 247 | |
| 248 | while ((len > 0) && (bp < ep)) { |
| 249 | TCHECK2(bp[0], 4); |
| 250 | printf("\n\tneighbor %s", ipaddr_string(bp)); |
| 251 | bp += 4; len -= 4; |
| 252 | } |
| 253 | return (0); |
| 254 | trunc: |
| 255 | return (-1); |
| 256 | } |
| 257 | |
| 258 | static int |
| 259 | print_neighbors(register const u_char *bp, register const u_char *ep, |
| 260 | register u_int len) |
| 261 | { |
| 262 | const u_char *laddr; |
| 263 | register u_char metric; |
| 264 | register u_char thresh; |
| 265 | register int ncount; |
| 266 | |
| 267 | while (len > 0 && bp < ep) { |
| 268 | TCHECK2(bp[0], 7); |
| 269 | laddr = bp; |
| 270 | bp += 4; |
| 271 | metric = *bp++; |
| 272 | thresh = *bp++; |
| 273 | ncount = *bp++; |
| 274 | len -= 7; |
| 275 | while (--ncount >= 0) { |
| 276 | TCHECK2(bp[0], 4); |
| 277 | printf(" [%s ->", ipaddr_string(laddr)); |
| 278 | printf(" %s, (%d/%d)]", |
| 279 | ipaddr_string(bp), metric, thresh); |
| 280 | bp += 4; |
| 281 | len -= 4; |
| 282 | } |
| 283 | } |
| 284 | return (0); |
| 285 | trunc: |
| 286 | return (-1); |
| 287 | } |
| 288 | |
| 289 | static int |
| 290 | print_neighbors2(register const u_char *bp, register const u_char *ep, |
| 291 | register u_int len) |
| 292 | { |
| 293 | const u_char *laddr; |
| 294 | register u_char metric, thresh, flags; |
| 295 | register int ncount; |
| 296 | |
| 297 | printf(" (v %d.%d):", |
| 298 | (int)target_level & 0xff, |
| 299 | (int)(target_level >> 8) & 0xff); |
| 300 | |
| 301 | while (len > 0 && bp < ep) { |
| 302 | TCHECK2(bp[0], 8); |
| 303 | laddr = bp; |
| 304 | bp += 4; |
| 305 | metric = *bp++; |
| 306 | thresh = *bp++; |
| 307 | flags = *bp++; |
| 308 | ncount = *bp++; |
| 309 | len -= 8; |
| 310 | while (--ncount >= 0 && (len >= 4) && (bp + 4) <= ep) { |
| 311 | printf(" [%s -> ", ipaddr_string(laddr)); |
| 312 | printf("%s (%d/%d", ipaddr_string(bp), |
| 313 | metric, thresh); |
| 314 | if (flags & DVMRP_NF_TUNNEL) |
| 315 | printf("/tunnel"); |
| 316 | if (flags & DVMRP_NF_SRCRT) |
| 317 | printf("/srcrt"); |
| 318 | if (flags & DVMRP_NF_QUERIER) |
| 319 | printf("/querier"); |
| 320 | if (flags & DVMRP_NF_DISABLED) |
| 321 | printf("/disabled"); |
| 322 | if (flags & DVMRP_NF_DOWN) |
| 323 | printf("/down"); |
| 324 | printf(")]"); |
| 325 | bp += 4; |
| 326 | len -= 4; |
| 327 | } |
| 328 | if (ncount != -1) { |
| 329 | printf(" [|]"); |
| 330 | return (0); |
| 331 | } |
| 332 | } |
| 333 | return (0); |
| 334 | trunc: |
| 335 | return (-1); |
| 336 | } |
| 337 | |
| 338 | static int |
| 339 | print_prune(register const u_char *bp) |
| 340 | { |
| 341 | TCHECK2(bp[0], 12); |
| 342 | printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4)); |
| 343 | bp += 8; |
| 344 | (void)printf(" timer "); |
| 345 | relts_print(EXTRACT_32BITS(bp)); |
| 346 | return (0); |
| 347 | trunc: |
| 348 | return (-1); |
| 349 | } |
| 350 | |
| 351 | static int |
| 352 | print_graft(register const u_char *bp) |
| 353 | { |
| 354 | TCHECK2(bp[0], 8); |
| 355 | printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4)); |
| 356 | return (0); |
| 357 | trunc: |
| 358 | return (-1); |
| 359 | } |
| 360 | |
| 361 | static int |
| 362 | print_graft_ack(register const u_char *bp) |
| 363 | { |
| 364 | TCHECK2(bp[0], 8); |
| 365 | printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4)); |
| 366 | return (0); |
| 367 | trunc: |
| 368 | return (-1); |
| 369 | } |