The Tcpdump Group git mirrors - tcpdump/blob - print-rpki-rtr.c

   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  * Original code by Hannes Gredler (hannes@juniper.net)
  16  */
  17
  18 /* \summary: Resource Public Key Infrastructure (RPKI) to Router Protocol printer */
  19
  20 /* specification: RFC 6810 */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <netdissect-stdinc.h>
  27
  28 #include <string.h>
  29
  30 #include "netdissect.h"
  31 #include "extract.h"
  32 #include "addrtoname.h"
  33
  34 /*
  35  * RPKI/Router PDU header
  36  *
  37  * Here's what the PDU header looks like.
  38  * The length does include the version and length fields.
  39  */
  40 typedef struct rpki_rtr_pdu_ {
  41     u_char version;             /* Version number */
  42     u_char pdu_type;            /* PDU type */
  43     union {
  44         u_char session_id[2];   /* Session id */
  45         u_char error_code[2];   /* Error code */
  46     } u;
  47     u_char length[4];
  48 } rpki_rtr_pdu;
  49 #define RPKI_RTR_PDU_OVERHEAD (offsetof(rpki_rtr_pdu, rpki_rtr_pdu_msg))
  50
  51 /*
  52  * IPv4 Prefix PDU.
  53  */
  54 typedef struct rpki_rtr_pdu_ipv4_prefix_ {
  55     rpki_rtr_pdu pdu_header;
  56     u_char flags;
  57     u_char prefix_length;
  58     u_char max_length;
  59     u_char zero;
  60     u_char prefix[4];
  61     u_char as[4];
  62 } rpki_rtr_pdu_ipv4_prefix;
  63
  64 /*
  65  * IPv6 Prefix PDU.
  66  */
  67 typedef struct rpki_rtr_pdu_ipv6_prefix_ {
  68     rpki_rtr_pdu pdu_header;
  69     u_char flags;
  70     u_char prefix_length;
  71     u_char max_length;
  72     u_char zero;
  73     u_char prefix[16];
  74     u_char as[4];
  75 } rpki_rtr_pdu_ipv6_prefix;
  76
  77 /*
  78  * Error report PDU.
  79  */
  80 typedef struct rpki_rtr_pdu_error_report_ {
  81     rpki_rtr_pdu pdu_header;
  82     u_char encapsulated_pdu_length[4]; /* Encapsulated PDU length */
  83 } rpki_rtr_pdu_error_report;
  84
  85 /*
  86  * PDU type codes
  87  */
  88 #define RPKI_RTR_SERIAL_NOTIFY_PDU      0
  89 #define RPKI_RTR_SERIAL_QUERY_PDU       1
  90 #define RPKI_RTR_RESET_QUERY_PDU        2
  91 #define RPKI_RTR_CACHE_RESPONSE_PDU     3
  92 #define RPKI_RTR_IPV4_PREFIX_PDU        4
  93 #define RPKI_RTR_IPV6_PREFIX_PDU        6
  94 #define RPKI_RTR_END_OF_DATA_PDU        7
  95 #define RPKI_RTR_CACHE_RESET_PDU        8
  96 #define RPKI_RTR_ERROR_REPORT_PDU       10
  97
  98 static const struct tok rpki_rtr_pdu_values[] = {
  99     { RPKI_RTR_SERIAL_NOTIFY_PDU, "Serial Notify" },
 100     { RPKI_RTR_SERIAL_QUERY_PDU, "Serial Query" },
 101     { RPKI_RTR_RESET_QUERY_PDU, "Reset Query" },
 102     { RPKI_RTR_CACHE_RESPONSE_PDU, "Cache Response" },
 103     { RPKI_RTR_IPV4_PREFIX_PDU, "IPV4 Prefix" },
 104     { RPKI_RTR_IPV6_PREFIX_PDU, "IPV6 Prefix" },
 105     { RPKI_RTR_END_OF_DATA_PDU, "End of Data" },
 106     { RPKI_RTR_CACHE_RESET_PDU, "Cache Reset" },
 107     { RPKI_RTR_ERROR_REPORT_PDU, "Error Report" },
 108     { 0, NULL}
 109 };
 110
 111 static const struct tok rpki_rtr_error_codes[] = {
 112     { 0, "Corrupt Data" },
 113     { 1, "Internal Error" },
 114     { 2, "No Data Available" },
 115     { 3, "Invalid Request" },
 116     { 4, "Unsupported Protocol Version" },
 117     { 5, "Unsupported PDU Type" },
 118     { 6, "Withdrawal of Unknown Record" },
 119     { 7, "Duplicate Announcement Received" },
 120     { 0, NULL}
 121 };
 122
 123 /*
 124  * Build a indentation string for a given indentation level.
 125  * XXX this should be really in util.c
 126  */
 127 static char *
 128 indent_string (u_int indent)
 129 {
 130     static char buf[20];
 131     u_int idx;
 132
 133     idx = 0;
 134     buf[idx] = '\0';
 135
 136     /*
 137      * Does the static buffer fit ?
 138      */
 139     if (sizeof(buf) < ((indent/8) + (indent %8) + 2)) {
 140         return buf;
 141     }
 142
 143     /*
 144      * Heading newline.
 145      */
 146     buf[idx] = '\n';
 147     idx++;
 148
 149     while (indent >= 8) {
 150         buf[idx] = '\t';
 151         idx++;
 152         indent -= 8;
 153     }
 154
 155     while (indent > 0) {
 156         buf[idx] = ' ';
 157         idx++;
 158         indent--;
 159     }
 160
 161     /*
 162      * Trailing zero.
 163      */
 164     buf[idx] = '\0';
 165
 166     return buf;
 167 }
 168
 169 /*
 170  * Print a single PDU.
 171  */
 172 static void
 173 rpki_rtr_pdu_print (netdissect_options *ndo, const u_char *tptr, u_int indent)
 174 {
 175     const rpki_rtr_pdu *pdu_header;
 176     u_int pdu_type, pdu_len, hexdump;
 177     const u_char *msg;
 178
 179     pdu_header = (const rpki_rtr_pdu *)tptr;
 180     pdu_type = pdu_header->pdu_type;
 181     pdu_len = EXTRACT_32BITS(pdu_header->length);
 182     ND_TCHECK2(*tptr, pdu_len);
 183     hexdump = FALSE;
 184
 185     ND_PRINT((ndo, "%sRPKI-RTRv%u, %s PDU (%u), length: %u",
 186            indent_string(8),
 187            pdu_header->version,
 188            tok2str(rpki_rtr_pdu_values, "Unknown", pdu_type),
 189            pdu_type, pdu_len));
 190
 191     switch (pdu_type) {
 192
 193         /*
 194          * The following PDUs share the message format.
 195          */
 196     case RPKI_RTR_SERIAL_NOTIFY_PDU:
 197     case RPKI_RTR_SERIAL_QUERY_PDU:
 198     case RPKI_RTR_END_OF_DATA_PDU:
 199         msg = (const u_char *)(pdu_header + 1);
 200         ND_PRINT((ndo, "%sSession ID: 0x%04x, Serial: %u",
 201                indent_string(indent+2),
 202                EXTRACT_16BITS(pdu_header->u.session_id),
 203                EXTRACT_32BITS(msg)));
 204         break;
 205
 206         /*
 207          * The following PDUs share the message format.
 208          */
 209     case RPKI_RTR_RESET_QUERY_PDU:
 210     case RPKI_RTR_CACHE_RESET_PDU:
 211
 212         /*
 213          * Zero payload PDUs.
 214          */
 215         break;
 216
 217     case RPKI_RTR_CACHE_RESPONSE_PDU:
 218         ND_PRINT((ndo, "%sSession ID: 0x%04x",
 219                indent_string(indent+2),
 220                EXTRACT_16BITS(pdu_header->u.session_id)));
 221         break;
 222
 223     case RPKI_RTR_IPV4_PREFIX_PDU:
 224         {
 225             const rpki_rtr_pdu_ipv4_prefix *pdu;
 226
 227             pdu = (const rpki_rtr_pdu_ipv4_prefix *)tptr;
 228             ND_PRINT((ndo, "%sIPv4 Prefix %s/%u-%u, origin-as %u, flags 0x%02x",
 229                    indent_string(indent+2),
 230                    ipaddr_string(ndo, pdu->prefix),
 231                    pdu->prefix_length, pdu->max_length,
 232                    EXTRACT_32BITS(pdu->as), pdu->flags));
 233         }
 234         break;
 235
 236     case RPKI_RTR_IPV6_PREFIX_PDU:
 237         {
 238             const rpki_rtr_pdu_ipv6_prefix *pdu;
 239
 240             pdu = (const rpki_rtr_pdu_ipv6_prefix *)tptr;
 241             ND_PRINT((ndo, "%sIPv6 Prefix %s/%u-%u, origin-as %u, flags 0x%02x",
 242                    indent_string(indent+2),
 243                    ip6addr_string(ndo, pdu->prefix),
 244                    pdu->prefix_length, pdu->max_length,
 245                    EXTRACT_32BITS(pdu->as), pdu->flags));
 246         }
 247         break;
 248
 249     case RPKI_RTR_ERROR_REPORT_PDU:
 250         {
 251             const rpki_rtr_pdu_error_report *pdu;
 252             u_int encapsulated_pdu_length, text_length, tlen, error_code;
 253
 254             pdu = (const rpki_rtr_pdu_error_report *)tptr;
 255             encapsulated_pdu_length = EXTRACT_32BITS(pdu->encapsulated_pdu_length);
 256             ND_TCHECK2(*tptr, encapsulated_pdu_length);
 257             tlen = pdu_len;
 258
 259             error_code = EXTRACT_16BITS(pdu->pdu_header.u.error_code);
 260             ND_PRINT((ndo, "%sError code: %s (%u), Encapsulated PDU length: %u",
 261                    indent_string(indent+2),
 262                    tok2str(rpki_rtr_error_codes, "Unknown", error_code),
 263                    error_code, encapsulated_pdu_length));
 264
 265             tptr += sizeof(*pdu);
 266             tlen -= sizeof(*pdu);
 267
 268             /*
 269              * Recurse if there is an encapsulated PDU.
 270              */
 271             if (encapsulated_pdu_length &&
 272                 (encapsulated_pdu_length <= tlen)) {
 273                 ND_PRINT((ndo, "%s-----encapsulated PDU-----", indent_string(indent+4)));
 274                 rpki_rtr_pdu_print(ndo, tptr, indent+2);
 275             }
 276
 277             tptr += encapsulated_pdu_length;
 278             tlen -= encapsulated_pdu_length;
 279
 280             /*
 281              * Extract, trail-zero and print the Error message.
 282              */
 283             text_length = 0;
 284             if (tlen > 4) {
 285                 text_length = EXTRACT_32BITS(tptr);
 286                 tptr += 4;
 287                 tlen -= 4;
 288             }
 289             ND_TCHECK2(*tptr, text_length);
 290             if (text_length && (text_length <= tlen )) {
 291                 ND_PRINT((ndo, "%sError text: ", indent_string(indent+2)));
 292                 if (fn_printn(ndo, tptr, text_length, ndo->ndo_snapend))
 293                         goto trunc;
 294             }
 295         }
 296         break;
 297
 298     default:
 299
 300         /*
 301          * Unknown data, please hexdump.
 302          */
 303         hexdump = TRUE;
 304     }
 305
 306     /* do we also want to see a hex dump ? */
 307     if (ndo->ndo_vflag > 1 || (ndo->ndo_vflag && hexdump)) {
 308         print_unknown_data(ndo,tptr,"\n\t  ", pdu_len);
 309     }
 310     return;
 311
 312  trunc:
 313     ND_PRINT((ndo, "|trunc"));
 314     return;
 315 }
 316
 317 void
 318 rpki_rtr_print(netdissect_options *ndo, 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 (!ndo->ndo_vflag) {
 328         ND_PRINT((ndo, ", RPKI-RTR"));
 329         return;
 330     }
 331
 332     while (tlen >= sizeof(rpki_rtr_pdu)) {
 333
 334         ND_TCHECK2(*tptr, sizeof(rpki_rtr_pdu));
 335
 336         pdu_header = (const rpki_rtr_pdu *)tptr;
 337         pdu_type = pdu_header->pdu_type;
 338         pdu_len = EXTRACT_32BITS(pdu_header->length);
 339         ND_TCHECK2(*tptr, pdu_len);
 340
 341         /* infinite loop check */
 342         if (!pdu_type || !pdu_len) {
 343             break;
 344         }
 345
 346         if (tlen < pdu_len) {
 347             goto trunc;
 348         }
 349
 350         /*
 351          * Print the PDU.
 352          */
 353         rpki_rtr_pdu_print(ndo, tptr, 8);
 354
 355         tlen -= pdu_len;
 356         tptr += pdu_len;
 357     }
 358     return;
 359  trunc:
 360     ND_PRINT((ndo, "\n\t[|RPKI-RTR]"));
 361 }
 362
 363 /*
 364  * Local Variables:
 365  * c-style: whitesmith
 366  * c-basic-offset: 4
 367  * End:
 368  */