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  * support for the The RPKI/Router Protocol as RFC6810
  16  *
  17  * Original code by Hannes Gredler (hannes@juniper.net)
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include <netdissect-stdinc.h>
  25
  26 #include <string.h>
  27
  28 #include "netdissect.h"
  29 #include "extract.h"
  30 #include "addrtoname.h"
  31
  32 /*
  33  * RPKI/Router PDU header
  34  *
  35  * Here's what the PDU header looks like.
  36  * The length does include the version and length fields.
  37  */
  38 typedef struct rpki_rtr_pdu_ {
  39     u_char version;             /* Version number */
  40     u_char pdu_type;            /* PDU type */
  41     union {
  42         u_char session_id[2];   /* Session id */
  43         u_char error_code[2];   /* Error code */
  44     } u;
  45     u_char length[4];
  46 } rpki_rtr_pdu;
  47 #define RPKI_RTR_PDU_OVERHEAD (offsetof(rpki_rtr_pdu, rpki_rtr_pdu_msg))
  48
  49 /*
  50  * IPv4 Prefix PDU.
  51  */
  52 typedef struct rpki_rtr_pdu_ipv4_prefix_ {
  53     rpki_rtr_pdu pdu_header;
  54     u_char flags;
  55     u_char prefix_length;
  56     u_char max_length;
  57     u_char zero;
  58     u_char prefix[4];
  59     u_char as[4];
  60 } rpki_rtr_pdu_ipv4_prefix;
  61
  62 /*
  63  * IPv6 Prefix PDU.
  64  */
  65 typedef struct rpki_rtr_pdu_ipv6_prefix_ {
  66     rpki_rtr_pdu pdu_header;
  67     u_char flags;
  68     u_char prefix_length;
  69     u_char max_length;
  70     u_char zero;
  71     u_char prefix[16];
  72     u_char as[4];
  73 } rpki_rtr_pdu_ipv6_prefix;
  74
  75 /*
  76  * Error report PDU.
  77  */
  78 typedef struct rpki_rtr_pdu_error_report_ {
  79     rpki_rtr_pdu pdu_header;
  80     u_char encapsulated_pdu_length[4]; /* Encapsulated PDU length */
  81 } rpki_rtr_pdu_error_report;
  82
  83 /*
  84  * PDU type codes
  85  */
  86 #define RPKI_RTR_SERIAL_NOTIFY_PDU      0
  87 #define RPKI_RTR_SERIAL_QUERY_PDU       1
  88 #define RPKI_RTR_RESET_QUERY_PDU        2
  89 #define RPKI_RTR_CACHE_RESPONSE_PDU     3
  90 #define RPKI_RTR_IPV4_PREFIX_PDU        4
  91 #define RPKI_RTR_IPV6_PREFIX_PDU        6
  92 #define RPKI_RTR_END_OF_DATA_PDU        7
  93 #define RPKI_RTR_CACHE_RESET_PDU        8
  94 #define RPKI_RTR_ERROR_REPORT_PDU       10
  95
  96 static const struct tok rpki_rtr_pdu_values[] = {
  97     { RPKI_RTR_SERIAL_NOTIFY_PDU, "Serial Notify" },
  98     { RPKI_RTR_SERIAL_QUERY_PDU, "Serial Query" },
  99     { RPKI_RTR_RESET_QUERY_PDU, "Reset Query" },
 100     { RPKI_RTR_CACHE_RESPONSE_PDU, "Cache Response" },
 101     { RPKI_RTR_IPV4_PREFIX_PDU, "IPV4 Prefix" },
 102     { RPKI_RTR_IPV6_PREFIX_PDU, "IPV6 Prefix" },
 103     { RPKI_RTR_END_OF_DATA_PDU, "End of Data" },
 104     { RPKI_RTR_CACHE_RESET_PDU, "Cache Reset" },
 105     { RPKI_RTR_ERROR_REPORT_PDU, "Error Report" },
 106     { 0, NULL}
 107 };
 108
 109 static const struct tok rpki_rtr_error_codes[] = {
 110     { 0, "Corrupt Data" },
 111     { 1, "Internal Error" },
 112     { 2, "No Data Available" },
 113     { 3, "Invalid Request" },
 114     { 4, "Unsupported Protocol Version" },
 115     { 5, "Unsupported PDU Type" },
 116     { 6, "Withdrawal of Unknown Record" },
 117     { 7, "Duplicate Announcement Received" },
 118     { 0, NULL}
 119 };
 120
 121 /*
 122  * Build a indentation string for a given indentation level.
 123  * XXX this should be really in util.c
 124  */
 125 static char *
 126 indent_string (u_int indent)
 127 {
 128     static char buf[20];
 129     u_int idx;
 130
 131     idx = 0;
 132     buf[idx] = '\0';
 133
 134     /*
 135      * Does the static buffer fit ?
 136      */
 137     if (sizeof(buf) < ((indent/8) + (indent %8) + 2)) {
 138         return buf;
 139     }
 140
 141     /*
 142      * Heading newline.
 143      */
 144     buf[idx] = '\n';
 145     idx++;
 146
 147     while (indent >= 8) {
 148         buf[idx] = '\t';
 149         idx++;
 150         indent -= 8;
 151     }
 152
 153     while (indent > 0) {
 154         buf[idx] = ' ';
 155         idx++;
 156         indent--;
 157     }
 158
 159     /*
 160      * Trailing zero.
 161      */
 162     buf[idx] = '\0';
 163
 164     return buf;
 165 }
 166
 167 /*
 168  * Print a single PDU.
 169  */
 170 static void
 171 rpki_rtr_pdu_print (netdissect_options *ndo, const u_char *tptr, u_int indent)
 172 {
 173     const rpki_rtr_pdu *pdu_header;
 174     u_int pdu_type, pdu_len, hexdump;
 175     const u_char *msg;
 176
 177     pdu_header = (const rpki_rtr_pdu *)tptr;
 178     pdu_type = pdu_header->pdu_type;
 179     pdu_len = EXTRACT_32BITS(pdu_header->length);
 180     ND_TCHECK2(*tptr, pdu_len);
 181     hexdump = FALSE;
 182
 183     ND_PRINT((ndo, "%sRPKI-RTRv%u, %s PDU (%u), length: %u",
 184            indent_string(8),
 185            pdu_header->version,
 186            tok2str(rpki_rtr_pdu_values, "Unknown", pdu_type),
 187            pdu_type, pdu_len));
 188
 189     switch (pdu_type) {
 190
 191         /*
 192          * The following PDUs share the message format.
 193          */
 194     case RPKI_RTR_SERIAL_NOTIFY_PDU:
 195     case RPKI_RTR_SERIAL_QUERY_PDU:
 196     case RPKI_RTR_END_OF_DATA_PDU:
 197         msg = (const u_char *)(pdu_header + 1);
 198         ND_PRINT((ndo, "%sSession ID: 0x%04x, Serial: %u",
 199                indent_string(indent+2),
 200                EXTRACT_16BITS(pdu_header->u.session_id),
 201                EXTRACT_32BITS(msg)));
 202         break;
 203
 204         /*
 205          * The following PDUs share the message format.
 206          */
 207     case RPKI_RTR_RESET_QUERY_PDU:
 208     case RPKI_RTR_CACHE_RESET_PDU:
 209
 210         /*
 211          * Zero payload PDUs.
 212          */
 213         break;
 214
 215     case RPKI_RTR_CACHE_RESPONSE_PDU:
 216         ND_PRINT((ndo, "%sSession ID: 0x%04x",
 217                indent_string(indent+2),
 218                EXTRACT_16BITS(pdu_header->u.session_id)));
 219         break;
 220
 221     case RPKI_RTR_IPV4_PREFIX_PDU:
 222         {
 223             const rpki_rtr_pdu_ipv4_prefix *pdu;
 224
 225             pdu = (const rpki_rtr_pdu_ipv4_prefix *)tptr;
 226             ND_PRINT((ndo, "%sIPv4 Prefix %s/%u-%u, origin-as %u, flags 0x%02x",
 227                    indent_string(indent+2),
 228                    ipaddr_string(ndo, pdu->prefix),
 229                    pdu->prefix_length, pdu->max_length,
 230                    EXTRACT_32BITS(pdu->as), pdu->flags));
 231         }
 232         break;
 233
 234     case RPKI_RTR_IPV6_PREFIX_PDU:
 235         {
 236             const rpki_rtr_pdu_ipv6_prefix *pdu;
 237
 238             pdu = (const rpki_rtr_pdu_ipv6_prefix *)tptr;
 239             ND_PRINT((ndo, "%sIPv6 Prefix %s/%u-%u, origin-as %u, flags 0x%02x",
 240                    indent_string(indent+2),
 241                    ip6addr_string(ndo, pdu->prefix),
 242                    pdu->prefix_length, pdu->max_length,
 243                    EXTRACT_32BITS(pdu->as), pdu->flags));
 244         }
 245         break;
 246
 247     case RPKI_RTR_ERROR_REPORT_PDU:
 248         {
 249             const rpki_rtr_pdu_error_report *pdu;
 250             u_int encapsulated_pdu_length, text_length, tlen, error_code;
 251
 252             pdu = (const rpki_rtr_pdu_error_report *)tptr;
 253             encapsulated_pdu_length = EXTRACT_32BITS(pdu->encapsulated_pdu_length);
 254             ND_TCHECK2(*tptr, encapsulated_pdu_length);
 255             tlen = pdu_len;
 256
 257             error_code = EXTRACT_16BITS(pdu->pdu_header.u.error_code);
 258             ND_PRINT((ndo, "%sError code: %s (%u), Encapsulated PDU length: %u",
 259                    indent_string(indent+2),
 260                    tok2str(rpki_rtr_error_codes, "Unknown", error_code),
 261                    error_code, encapsulated_pdu_length));
 262
 263             tptr += sizeof(*pdu);
 264             tlen -= sizeof(*pdu);
 265
 266             /*
 267              * Recurse if there is an encapsulated PDU.
 268              */
 269             if (encapsulated_pdu_length &&
 270                 (encapsulated_pdu_length <= tlen)) {
 271                 ND_PRINT((ndo, "%s-----encapsulated PDU-----", indent_string(indent+4)));
 272                 rpki_rtr_pdu_print(ndo, tptr, indent+2);
 273             }
 274
 275             tptr += encapsulated_pdu_length;
 276             tlen -= encapsulated_pdu_length;
 277
 278             /*
 279              * Extract, trail-zero and print the Error message.
 280              */
 281             text_length = 0;
 282             if (tlen > 4) {
 283                 text_length = EXTRACT_32BITS(tptr);
 284                 tptr += 4;
 285                 tlen -= 4;
 286             }
 287             ND_TCHECK2(*tptr, text_length);
 288             if (text_length && (text_length <= tlen )) {
 289                 ND_PRINT((ndo, "%sError text: ", indent_string(indent+2)));
 290                 fn_printn(ndo, tptr, text_length, ndo->ndo_snapend);
 291             }
 292         }
 293         break;
 294
 295     default:
 296
 297         /*
 298          * Unknown data, please hexdump.
 299          */
 300         hexdump = TRUE;
 301     }
 302
 303     /* do we also want to see a hex dump ? */
 304     if (ndo->ndo_vflag > 1 || (ndo->ndo_vflag && hexdump)) {
 305         print_unknown_data(ndo,tptr,"\n\t  ", pdu_len);
 306     }
 307     return;
 308
 309  trunc:
 310     ND_PRINT((ndo, "|trunc"));
 311     return;
 312 }
 313
 314 void
 315 rpki_rtr_print(netdissect_options *ndo, register const u_char *pptr, register u_int len)
 316 {
 317     u_int tlen, pdu_type, pdu_len;
 318     const u_char *tptr;
 319     const rpki_rtr_pdu *pdu_header;
 320
 321     tptr = pptr;
 322     tlen = len;
 323
 324     if (!ndo->ndo_vflag) {
 325         ND_PRINT((ndo, ", RPKI-RTR"));
 326         return;
 327     }
 328
 329     while (tlen >= sizeof(rpki_rtr_pdu)) {
 330
 331         ND_TCHECK2(*tptr, sizeof(rpki_rtr_pdu));
 332
 333         pdu_header = (const rpki_rtr_pdu *)tptr;
 334         pdu_type = pdu_header->pdu_type;
 335         pdu_len = EXTRACT_32BITS(pdu_header->length);
 336         ND_TCHECK2(*tptr, pdu_len);
 337
 338         /* infinite loop check */
 339         if (!pdu_type || !pdu_len) {
 340             break;
 341         }
 342
 343         if (tlen < pdu_len) {
 344             goto trunc;
 345         }
 346
 347         /*
 348          * Print the PDU.
 349          */
 350         rpki_rtr_pdu_print(ndo, tptr, 8);
 351
 352         tlen -= pdu_len;
 353         tptr += pdu_len;
 354     }
 355     return;
 356  trunc:
 357     ND_PRINT((ndo, "\n\t[|RPKI-RTR]"));
 358 }
 359
 360 /*
 361  * Local Variables:
 362  * c-style: whitesmith
 363  * c-basic-offset: 4
 364  * End:
 365  */