The Tcpdump Group git mirrors - tcpdump/blob - print-dhcp6.c

   1 /*
   2  * Copyright (C) 1998 and 1999 WIDE Project.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef lint
  31 static const char rcsid[] =
  32     "@(#) $Header: /tcpdump/master/tcpdump/print-dhcp6.c,v 1.8 2000-05-17 05:00:12 itojun Exp $";
  33 #endif
  34
  35 #ifdef HAVE_CONFIG_H
  36 #include "config.h"
  37 #endif
  38
  39 #include <sys/param.h>
  40 #include <sys/time.h>
  41 #include <sys/socket.h>
  42
  43 #if __STDC__
  44 struct mbuf;
  45 struct rtentry;
  46 #endif
  47 #include <net/if.h>
  48
  49 #include <netinet/in.h>
  50
  51 #include <ctype.h>
  52 #ifdef HAVE_MEMORY_H
  53 #include <memory.h>
  54 #endif
  55 #include <stdio.h>
  56 #include <string.h>
  57 #include <arpa/inet.h>
  58
  59 #include "interface.h"
  60 #include "addrtoname.h"
  61 #include "dhcp6.h"
  62 #include "dhcp6opt.h"
  63
  64 #if 0
  65 static void dhcp6opttab_init __P((void));
  66 static struct dhcp6_opt *dhcp6opttab_byname __P((char *));
  67 #endif
  68 static struct dhcp6_opt *dhcp6opttab_bycode __P((u_int));
  69
  70 static char tstr[] = " [|dhcp6]";
  71
  72 static struct dhcp6_opt dh6opttab[] = {
  73         /* IP Address Extension */
  74         { 1, OL6_N,     "IP Address",                   OT6_NONE, },
  75
  76         /* General Extension */
  77         { 8193, OL6_N,  "IEEE 1003.1 POSIX Timezone",   OT6_STR, },
  78         { 8194, OL6_16N, "Domain Name Server",          OT6_V6, },
  79         { 8195, OL6_N,  "Domain Name",                  OT6_STR, },
  80
  81         { 8196, OL6_N,  "SLP Agent",                    OT6_NONE, },
  82         { 8197, OL6_N,  "SLP Scope"     ,               OT6_NONE, },
  83         { 8198, OL6_16N, "Network Time Protocol Servers", OT6_V6, },
  84         { 8199, OL6_N,  "NIS Domain",                   OT6_STR, },
  85         { 8200, OL6_16N, "NIS Servers",                 OT6_V6, },
  86         { 8201, OL6_N,  "NIS+ Domain",                  OT6_STR, },
  87         { 8202, OL6_16N, "NIS+ Servers",                OT6_V6, },
  88
  89         /* TCP Parameters */
  90         { 8203, 4,      "TCP Keepalive Interval",       OT6_NUM, },
  91
  92         /* DHCPv6 Extensions */
  93         { 8204, 4,      "Maximum DHCPv6 Message Size",  OT6_NUM, },
  94         { 8205, OL6_N,  "DHCP Retransmission and Configuration Parameter",
  95                                                         OT6_NONE, },
  96         { 8206, OL6_N,  "Extension Request",            OT6_NONE, },
  97         { 8207, OL6_N,  "Subnet Prefix",                OT6_NONE, },
  98         { 8208, OL6_N,  "Platform Specific Information", OT6_NONE, },
  99         { 8209, OL6_N,  "Platform Class Identifier",    OT6_STR, },
 100         { 8210, OL6_N,  "Class Identifier",             OT6_STR, },
 101         { 8211, 16,     "Reconfigure Multicast Address", OT6_V6, },
 102         { 8212, 16,     "Renumber DHCPv6 Server Address",
 103                                                         OT6_V6, },
 104         { 8213, OL6_N,  "Client-Server Authentication", OT6_NONE, },
 105         { 8214, 4,      "Client Key Selection",         OT6_NUM, },
 106
 107         /* End Extension */
 108         { 65536, OL6_Z, "End",                          OT6_NONE, },
 109
 110         { 0 },
 111 };
 112
 113 #if 0
 114 static struct dhcp6_opt *dh6o_pad;
 115 static struct dhcp6_opt *dh6o_end;
 116
 117 static void
 118 dhcp6opttab_init()
 119 {
 120         dh6o_pad = dhcp6opttab_bycode(0);
 121         dh6o_end = dhcp6opttab_bycode(65536);
 122 }
 123 #endif
 124
 125 #if 0
 126 static struct dhcp6_opt *
 127 dhcp6opttab_byname(name)
 128         char *name;
 129 {
 130         struct dhcp6_opt *p;
 131
 132         for (p = dh6opttab; p->code; p++)
 133                 if (strcmp(name, p->name) == 0)
 134                         return p;
 135         return NULL;
 136 }
 137 #endif
 138
 139 static struct dhcp6_opt *
 140 dhcp6opttab_bycode(code)
 141         u_int code;
 142 {
 143         struct dhcp6_opt *p;
 144
 145         for (p = dh6opttab; p->code; p++)
 146                 if (p->code == code)
 147                         return p;
 148         return NULL;
 149 }
 150
 151 static void
 152 dhcp6ext_print(u_char *cp, u_char *ep)
 153 {
 154         u_int16_t code, len;
 155         struct dhcp6_opt *p;
 156         char buf[BUFSIZ];
 157         int i;
 158
 159         if (cp == ep)
 160                 return;
 161         printf(" ");
 162         while (cp < ep) {
 163                 if (ep - cp < sizeof(u_int16_t))
 164                         break;
 165                 code = ntohs(*(u_int16_t *)&cp[0]);
 166                 if (ep - cp < sizeof(u_int16_t) * 2)
 167                         break;
 168                 if (code != 65535)
 169                         len = ntohs(*(u_int16_t *)&cp[2]);
 170                 else
 171                         len = 0;
 172                 if (ep - cp < len + 4)
 173                         break;
 174                 p = dhcp6opttab_bycode(code);
 175                 if (p == NULL) {
 176                         printf("(unknown, len=%d)", len);
 177                         cp += len + 4;
 178                         continue;
 179                 }
 180
 181                 /* sanity check on length */
 182                 switch (p->len) {
 183                 case OL6_N:
 184                         break;
 185                 case OL6_16N:
 186                         if (len % 16 != 0)
 187                                 goto trunc;
 188                         break;
 189                 case OL6_Z:
 190                         if (len != 0)
 191                                 goto trunc;
 192                         break;
 193                 default:
 194                         if (len != p->len)
 195                                 goto trunc;
 196                         break;
 197                 }
 198                 if (cp + 4 + len > ep) {
 199                         printf("[|%s]", p->name);
 200                         return;
 201                 }
 202
 203                 printf("(%s, ", p->name);
 204                 switch (p->type) {
 205                 case OT6_V6:
 206                         for (i = 0; i < len; i += 16) {
 207                                 inet_ntop(AF_INET6, &cp[4 + i], buf,
 208                                         sizeof(buf));
 209                                 if (i != 0)
 210                                         printf(",");
 211                                 printf("%s", buf);
 212                         }
 213                         break;
 214                 case OT6_STR:
 215                         memset(&buf, 0, sizeof(buf));
 216                         strncpy(buf, &cp[4], len);
 217                         printf("%s", buf);
 218                         break;
 219                 case OT6_NUM:
 220                         printf("%d", (u_int32_t)ntohl(*(u_int32_t *)&cp[4]));
 221                         break;
 222                 default:
 223                         for (i = 0; i < len; i++)
 224                                 printf("%02x", cp[4 + i] & 0xff);
 225                 }
 226                 printf(")");
 227                 cp += len + 4;
 228         }
 229         return;
 230
 231 trunc:
 232         printf("[|dhcp6ext]");
 233 }
 234
 235 /*
 236  * Print dhcp6 requests
 237  */
 238 void
 239 dhcp6_print(register const u_char *cp, u_int length,
 240             u_int16_t sport, u_int16_t dport)
 241 {
 242         union dhcp6 *dh6;
 243         u_char *ep;
 244         u_char *extp;
 245         u_int16_t field16;
 246
 247         printf("dhcp6");
 248
 249         ep = (u_char *)snapend;
 250
 251         dh6 = (union dhcp6 *)cp;
 252         TCHECK(dh6->dh6_msgtype);
 253         switch (dh6->dh6_msgtype) {
 254         case DH6_SOLICIT:
 255                 if (!(vflag && TTEST(dh6->dh6_sol.dh6sol_relayaddr))) {
 256                         printf(" solicit");
 257                         break;
 258                 }
 259
 260                 printf(" solicit(");    /*)*/
 261                 if (dh6->dh6_sol.dh6sol_flags != 0) {
 262                         u_int8_t f = dh6->dh6_sol.dh6sol_flags;
 263                         printf("%s%s ",
 264                            (f & DH6SOL_PREFIX) ? "P" : "",
 265                            (f & DH6SOL_CLOSE) ? "C" : "");
 266                 }
 267
 268                 memcpy(&field16, &dh6->dh6_sol.dh6sol_plen_id,
 269                        sizeof(field16));
 270                 field16 = ntohs(field16);
 271                 if (field16 & ~DH6SOL_SOLICIT_PLEN_MASK)
 272                         printf("plen=%d ", DH6SOL_SOLICIT_PLEN(field16));
 273                 printf("solicit-ID=%d", DH6SOL_SOLICIT_ID(field16));
 274
 275                 printf(" cliaddr=%s",
 276                         ip6addr_string(&dh6->dh6_sol.dh6sol_cliaddr));
 277                 printf(" relayaddr=%s",
 278                         ip6addr_string(&dh6->dh6_sol.dh6sol_relayaddr));
 279                 /*(*/
 280                 printf(")");
 281                 break;
 282         case DH6_ADVERT:
 283                 if (!(vflag && TTEST(dh6->dh6_adv.dh6adv_serveraddr))) {
 284                         printf(" advert");
 285                         break;
 286                 }
 287                 printf(" advert(");     /*)*/
 288                 memcpy(&field16, &dh6->dh6_adv.dh6adv_rsv_id, sizeof(field16));
 289                 printf("solicit-ID=%d",
 290                        ntohs(field16) & DH6SOL_SOLICIT_ID_MASK);
 291                 printf(" pref=%u", dh6->dh6_adv.dh6adv_pref);
 292                 printf(" cliaddr=%s",
 293                         ip6addr_string(&dh6->dh6_adv.dh6adv_cliaddr));
 294                 printf(" relayaddr=%s",
 295                         ip6addr_string(&dh6->dh6_adv.dh6adv_relayaddr));
 296                 printf(" servaddr=%s",
 297                         ip6addr_string(&dh6->dh6_adv.dh6adv_serveraddr));
 298                 extp = (u_char *)((&dh6->dh6_adv) + 1);
 299                 dhcp6ext_print(extp, ep);
 300                 /*(*/
 301                 printf(")");
 302                 break;
 303         case DH6_REQUEST:
 304                 if (!(vflag && TTEST(dh6->dh6_req.dh6req_relayaddr))) {
 305                         printf(" request");
 306                         break;
 307                 }
 308                 printf(" request(");    /*)*/
 309                 if (dh6->dh6_req.dh6req_flags != 0) {
 310                         u_int8_t f = dh6->dh6_req.dh6req_flags;
 311                         printf("%s%s ",
 312                            (f & DH6REQ_CLOSE) ? "C" : "",
 313                            (f & DH6REQ_REBOOT) ? "R" : "");
 314                 }
 315                 printf("xid=0x%04x", dh6->dh6_req.dh6req_xid);
 316                 printf(" cliaddr=%s",
 317                        ip6addr_string(&dh6->dh6_req.dh6req_cliaddr));
 318                 printf(" relayaddr=%s",
 319                        ip6addr_string(&dh6->dh6_req.dh6req_relayaddr));
 320                 printf(" servaddr=%s",
 321                        ip6addr_string(&dh6->dh6_req.dh6req_serveraddr));
 322                 dhcp6ext_print((char *)(&dh6->dh6_req + 1), ep);
 323                 /*(*/
 324                 printf(")");
 325                 break;
 326         case DH6_REPLY:
 327                 if (!(vflag && TTEST(dh6->dh6_rep.dh6rep_xid))) {
 328                         printf(" reply");
 329                         break;
 330                 }
 331                 printf(" reply(");      /*)*/
 332                 if ((dh6->dh6_rep.dh6rep_flagandstat & DH6REP_RELAYPRESENT) != 0)
 333                         printf("R ");
 334                 printf("stat=0x%02x",
 335                         dh6->dh6_rep.dh6rep_flagandstat & DH6REP_STATMASK);
 336                 printf(" xid=0x%04x", dh6->dh6_rep.dh6rep_xid);
 337                 printf(" cliaddr=%s",
 338                        ip6addr_string(&dh6->dh6_rep.dh6rep_cliaddr));
 339                 extp = (u_char *)((&dh6->dh6_rep) + 1);
 340                 if ((dh6->dh6_rep.dh6rep_flagandstat & DH6REP_RELAYPRESENT) !=
 341                     0) {
 342                         printf(" relayaddr=%s", ip6addr_string(extp));
 343                         extp += sizeof(struct in6_addr);
 344                 }
 345                 dhcp6ext_print(extp, ep);
 346                 /*(*/
 347                 printf(")");
 348                 break;
 349         case DH6_RELEASE:
 350                 printf(" release");
 351                 break;
 352         case DH6_RECONFIG:
 353                 printf(" reconfig");
 354                 break;
 355         }
 356         return;
 357
 358 trunc:
 359         printf("%s", tstr);
 360 }