JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 1998-2011 The TCPDUMP project |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that: (1) source code |
| 6 | * distributions retain the above copyright notice and this paragraph |
| 7 | * in its entirety, and (2) distributions including binary code include |
| 8 | * the above copyright notice and this paragraph in its entirety in |
| 9 | * the documentation or other materials provided with the distribution. |
| 10 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND |
| 11 | * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT |
| 12 | * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 13 | * FOR A PARTICULAR PURPOSE. |
| 14 | * |
| 15 | * support for the The RPKI/Router Protocol as RFC6810 |
| 16 | * |
| 17 | * Original code by Hannes Gredler (hannes@juniper.net) |
| 18 | */ |
| 19 | |
| 20 | #ifndef lint |
| 21 | static const char rcsid[] _U_ = |
| 22 | "@(#) $Header: /tcpdump/master/tcpdump/print-rpki_rtr.c,v 1.10 2008-03-20 09:30:56 hannes Exp $"; |
| 23 | #endif |
| 24 | |
| 25 | #ifdef HAVE_CONFIG_H |
| 26 | #include "config.h" |
| 27 | #endif |
| 28 | |
| 29 | #include <tcpdump-stdinc.h> |
| 30 | |
| 31 | #include <stdio.h> |
| 32 | #include <stdlib.h> |
| 33 | #include <string.h> |
| 34 | |
| 35 | #include "interface.h" |
| 36 | #include "extract.h" |
| 37 | #include "addrtoname.h" |
| 38 | |
| 39 | /* |
| 40 | * RPKI/Router PDU header |
| 41 | * |
| 42 | * Here's what the PDU header looks like. |
| 43 | * The length does include the version and length fields. |
| 44 | */ |
| 45 | typedef struct rpki_rtr_pdu_ { |
| 46 | u_char version; /* Version number */ |
| 47 | u_char pdu_type; /* PDU type */ |
| 48 | union { |
| 49 | u_char session_id[2]; /* Session id */ |
| 50 | u_char error_code[2]; /* Error code */ |
| 51 | } u; |
| 52 | u_char length[4]; |
| 53 | } rpki_rtr_pdu; |
| 54 | #define RPKI_RTR_PDU_OVERHEAD (offsetof(rpki_rtr_pdu, rpki_rtr_pdu_msg)) |
| 55 | |
| 56 | /* |
| 57 | * IPv4 Prefix PDU. |
| 58 | */ |
| 59 | typedef struct rpki_rtr_pdu_ipv4_prefix_ { |
| 60 | rpki_rtr_pdu pdu_header; |
| 61 | u_char flags; |
| 62 | u_char prefix_length; |
| 63 | u_char max_length; |
| 64 | u_char zero; |
| 65 | u_char prefix[4]; |
| 66 | u_char as[4]; |
| 67 | } rpki_rtr_pdu_ipv4_prefix; |
| 68 | |
| 69 | /* |
| 70 | * IPv6 Prefix PDU. |
| 71 | */ |
| 72 | typedef struct rpki_rtr_pdu_ipv6_prefix_ { |
| 73 | rpki_rtr_pdu pdu_header; |
| 74 | u_char flags; |
| 75 | u_char prefix_length; |
| 76 | u_char max_length; |
| 77 | u_char zero; |
| 78 | u_char prefix[16]; |
| 79 | u_char as[4]; |
| 80 | } rpki_rtr_pdu_ipv6_prefix; |
| 81 | |
| 82 | /* |
| 83 | * Error report PDU. |
| 84 | */ |
| 85 | typedef struct rpki_rtr_pdu_error_report_ { |
| 86 | rpki_rtr_pdu pdu_header; |
| 87 | u_char encapsulated_pdu_length[4]; /* Encapsulated PDU length */ |
| 88 | } rpki_rtr_pdu_error_report; |
| 89 | |
| 90 | /* |
| 91 | * PDU type codes |
| 92 | */ |
| 93 | #define RPKI_RTR_SERIAL_NOTIFY_PDU 0 |
| 94 | #define RPKI_RTR_SERIAL_QUERY_PDU 1 |
| 95 | #define RPKI_RTR_RESET_QUERY_PDU 2 |
| 96 | #define RPKI_RTR_CACHE_RESPONSE_PDU 3 |
| 97 | #define RPKI_RTR_IPV4_PREFIX_PDU 4 |
| 98 | #define RPKI_RTR_IPV6_PREFIX_PDU 6 |
| 99 | #define RPKI_RTR_END_OF_DATA_PDU 7 |
| 100 | #define RPKI_RTR_CACHE_RESET_PDU 8 |
| 101 | #define RPKI_RTR_ERROR_REPORT_PDU 10 |
| 102 | |
| 103 | static const struct tok rpki_rtr_pdu_values[] = { |
| 104 | { RPKI_RTR_SERIAL_NOTIFY_PDU, "Serial Notify" }, |
| 105 | { RPKI_RTR_SERIAL_QUERY_PDU, "Serial Query" }, |
| 106 | { RPKI_RTR_RESET_QUERY_PDU, "Reset Query" }, |
| 107 | { RPKI_RTR_CACHE_RESPONSE_PDU, "Cache Response" }, |
| 108 | { RPKI_RTR_IPV4_PREFIX_PDU, "IPV4 Prefix" }, |
| 109 | { RPKI_RTR_IPV6_PREFIX_PDU, "IPV6 Prefix" }, |
| 110 | { RPKI_RTR_END_OF_DATA_PDU, "End of Data" }, |
| 111 | { RPKI_RTR_CACHE_RESET_PDU, "Cache Reset" }, |
| 112 | { RPKI_RTR_ERROR_REPORT_PDU, "Error Report" }, |
| 113 | { 0, NULL} |
| 114 | }; |
| 115 | |
| 116 | static const struct tok rpki_rtr_error_codes[] = { |
| 117 | { 0, "Corrupt Data" }, |
| 118 | { 1, "Internal Error" }, |
| 119 | { 2, "No Data Available" }, |
| 120 | { 3, "Invalid Request" }, |
| 121 | { 4, "Unsupported Protocol Version" }, |
| 122 | { 5, "Unsupported PDU Type" }, |
| 123 | { 6, "Withdrawal of Unknown Record" }, |
| 124 | { 7, "Duplicate Announcement Received" }, |
| 125 | { 0, NULL} |
| 126 | }; |
| 127 | |
| 128 | /* |
| 129 | * Build a identation string for a given identation level. |
| 130 | * XXX this should be really in util.c |
| 131 | */ |
| 132 | static char * |
| 133 | indent_string (u_int indent) |
| 134 | { |
| 135 | static char buf[20]; |
| 136 | u_int idx; |
| 137 | |
| 138 | idx = 0; |
| 139 | buf[idx] = '\0'; |
| 140 | |
| 141 | /* |
| 142 | * Does the static buffer fit ? |
| 143 | */ |
| 144 | if (sizeof(buf) < ((indent/8) + (indent %8) + 2)) { |
| 145 | return buf; |
| 146 | } |
| 147 | |
| 148 | /* |
| 149 | * Heading newline. |
| 150 | */ |
| 151 | buf[idx] = '\n'; |
| 152 | idx++; |
| 153 | |
| 154 | while (indent >= 8) { |
| 155 | buf[idx] = '\t'; |
| 156 | idx++; |
| 157 | indent -= 8; |
| 158 | } |
| 159 | |
| 160 | while (indent > 0) { |
| 161 | buf[idx] = ' '; |
| 162 | idx++; |
| 163 | indent--; |
| 164 | } |
| 165 | |
| 166 | /* |
| 167 | * Trailing zero. |
| 168 | */ |
| 169 | buf[idx] = '\0'; |
| 170 | |
| 171 | return buf; |
| 172 | } |
| 173 | |
| 174 | /* |
| 175 | * Print a single PDU. |
| 176 | */ |
| 177 | static void |
| 178 | rpki_rtr_pdu_print (const u_char *tptr, u_int indent) |
| 179 | { |
| 180 | const rpki_rtr_pdu *pdu_header; |
| 181 | u_int pdu_type, pdu_len, hexdump; |
| 182 | const u_char *msg; |
| 183 | |
| 184 | pdu_header = (rpki_rtr_pdu *)tptr; |
| 185 | pdu_type = pdu_header->pdu_type; |
| 186 | pdu_len = EXTRACT_32BITS(pdu_header->length); |
| 187 | hexdump = FALSE; |
| 188 | |
| 189 | printf("%sRPKI-RTRv%u, %s PDU (%u), length: %u", |
| 190 | indent_string(8), |
| 191 | pdu_header->version, |
| 192 | tok2str(rpki_rtr_pdu_values, "Unknown", pdu_type), |
| 193 | pdu_type, pdu_len); |
| 194 | |
| 195 | switch (pdu_type) { |
| 196 | |
| 197 | /* |
| 198 | * The following PDUs share the message format. |
| 199 | */ |
| 200 | case RPKI_RTR_SERIAL_NOTIFY_PDU: |
| 201 | case RPKI_RTR_SERIAL_QUERY_PDU: |
| 202 | case RPKI_RTR_END_OF_DATA_PDU: |
| 203 | msg = (const u_char *)(pdu_header + 1); |
| 204 | printf("%sSession ID: 0x%04x, Serial: %u", |
| 205 | indent_string(indent+2), |
| 206 | EXTRACT_16BITS(pdu_header->u.session_id), |
| 207 | EXTRACT_32BITS(msg)); |
| 208 | break; |
| 209 | |
| 210 | /* |
| 211 | * The following PDUs share the message format. |
| 212 | */ |
| 213 | case RPKI_RTR_RESET_QUERY_PDU: |
| 214 | case RPKI_RTR_CACHE_RESET_PDU: |
| 215 | |
| 216 | /* |
| 217 | * Zero payload PDUs. |
| 218 | */ |
| 219 | break; |
| 220 | |
| 221 | case RPKI_RTR_CACHE_RESPONSE_PDU: |
| 222 | printf("%sSession ID: 0x%04x", |
| 223 | indent_string(indent+2), |
| 224 | EXTRACT_16BITS(pdu_header->u.session_id)); |
| 225 | break; |
| 226 | |
| 227 | case RPKI_RTR_IPV4_PREFIX_PDU: |
| 228 | { |
| 229 | rpki_rtr_pdu_ipv4_prefix *pdu; |
| 230 | |
| 231 | pdu = (rpki_rtr_pdu_ipv4_prefix *)tptr; |
| 232 | printf("%sIPv4 Prefix %s/%u-%u, origin-as %u, flags 0x%02x", |
| 233 | indent_string(indent+2), |
| 234 | ipaddr_string(pdu->prefix), |
| 235 | pdu->prefix_length, pdu->max_length, |
| 236 | EXTRACT_32BITS(pdu->as), pdu->flags); |
| 237 | } |
| 238 | break; |
| 239 | |
| 240 | #ifdef INET6 |
| 241 | case RPKI_RTR_IPV6_PREFIX_PDU: |
| 242 | { |
| 243 | rpki_rtr_pdu_ipv6_prefix *pdu; |
| 244 | |
| 245 | pdu = (rpki_rtr_pdu_ipv6_prefix *)tptr; |
| 246 | printf("%sIPv6 Prefix %s/%u-%u, origin-as %u, flags 0x%02x", |
| 247 | indent_string(indent+2), |
| 248 | ip6addr_string(pdu->prefix), |
| 249 | pdu->prefix_length, pdu->max_length, |
| 250 | EXTRACT_32BITS(pdu->as), pdu->flags); |
| 251 | } |
| 252 | break; |
| 253 | #endif |
| 254 | |
| 255 | case RPKI_RTR_ERROR_REPORT_PDU: |
| 256 | { |
| 257 | rpki_rtr_pdu_error_report *pdu; |
| 258 | u_int encapsulated_pdu_length, text_length, tlen, error_code; |
| 259 | u_char buf[80]; |
| 260 | |
| 261 | pdu = (rpki_rtr_pdu_error_report *)tptr; |
| 262 | encapsulated_pdu_length = EXTRACT_32BITS(pdu->encapsulated_pdu_length); |
| 263 | tlen = pdu_len; |
| 264 | |
| 265 | error_code = EXTRACT_16BITS(pdu->pdu_header.u.error_code); |
| 266 | printf("%sError code: %s (%u), Encapsulated PDU length: %u", |
| 267 | indent_string(indent+2), |
| 268 | tok2str(rpki_rtr_error_codes, "Unknown", error_code), |
| 269 | error_code, encapsulated_pdu_length); |
| 270 | |
| 271 | tptr += sizeof(*pdu); |
| 272 | tlen -= sizeof(*pdu); |
| 273 | |
| 274 | /* |
| 275 | * Recurse if there is an encapsulated PDU. |
| 276 | */ |
| 277 | if (encapsulated_pdu_length && |
| 278 | (encapsulated_pdu_length <= tlen)) { |
| 279 | printf("%s-----encapsulated PDU-----", indent_string(indent+4)); |
| 280 | rpki_rtr_pdu_print(tptr, indent+2); |
| 281 | } |
| 282 | |
| 283 | tptr += encapsulated_pdu_length; |
| 284 | tlen -= encapsulated_pdu_length; |
| 285 | |
| 286 | /* |
| 287 | * Extract, trail-zero and print the Error message. |
| 288 | */ |
| 289 | text_length = 0; |
| 290 | if (tlen > 4) { |
| 291 | text_length = EXTRACT_32BITS(tptr); |
| 292 | tptr += 4; |
| 293 | tlen -= 4; |
| 294 | } |
| 295 | if (text_length && (text_length <= tlen )) { |
| 296 | memcpy(buf, tptr, MIN(sizeof(buf)-1, text_length)); |
| 297 | buf[text_length] = '\0'; |
| 298 | printf("%sError text: %s", indent_string(indent+2), buf); |
| 299 | } |
| 300 | } |
| 301 | break; |
| 302 | |
| 303 | default: |
| 304 | |
| 305 | /* |
| 306 | * Unknown data, please hexdump. |
| 307 | */ |
| 308 | hexdump = TRUE; |
| 309 | } |
| 310 | |
| 311 | /* do we also want to see a hex dump ? */ |
| 312 | if (vflag > 1 || (vflag && hexdump)) { |
| 313 | print_unknown_data(tptr,"\n\t ", pdu_len); |
| 314 | } |
| 315 | } |
| 316 | |
| 317 | void |
| 318 | rpki_rtr_print(register const u_char *pptr, register u_int len) { |
| 319 | |
| 320 | u_int tlen, pdu_type, pdu_len; |
| 321 | const u_char *tptr; |
| 322 | const rpki_rtr_pdu *pdu_header; |
| 323 | |
| 324 | tptr = pptr; |
| 325 | tlen = len; |
| 326 | |
| 327 | if (!vflag) { |
| 328 | printf(", RPKI-RTR"); |
| 329 | return; |
| 330 | } |
| 331 | |
| 332 | while (tlen >= sizeof(rpki_rtr_pdu)) { |
| 333 | |
| 334 | TCHECK2(*tptr, sizeof(rpki_rtr_pdu)); |
| 335 | |
| 336 | pdu_header = (rpki_rtr_pdu *)tptr; |
| 337 | pdu_type = pdu_header->pdu_type; |
| 338 | pdu_len = EXTRACT_32BITS(pdu_header->length); |
| 339 | |
| 340 | /* infinite loop check */ |
| 341 | if (!pdu_type || !pdu_len) { |
| 342 | break; |
| 343 | } |
| 344 | |
| 345 | TCHECK2(*tptr, pdu_len); |
| 346 | if (tlen < pdu_len) { |
| 347 | goto trunc; |
| 348 | } |
| 349 | |
| 350 | /* |
| 351 | * Print the PDU. |
| 352 | */ |
| 353 | rpki_rtr_pdu_print(tptr, 8); |
| 354 | |
| 355 | tlen -= pdu_len; |
| 356 | tptr += pdu_len; |
| 357 | } |
| 358 | return; |
| 359 | trunc: |
| 360 | printf("\n\t[|RPKI-RTR]"); |
| 361 | } |
| 362 | |
| 363 | /* |
| 364 | * Local Variables: |
| 365 | * c-style: whitesmith |
| 366 | * c-basic-offset: 4 |
| 367 | * End: |
| 368 | */ |