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 1.14 2001-09-17 21:57:59 fenner 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 struct mbuf;
  44 struct rtentry;
  45
  46 #include <netinet/in.h>
  47
  48 #include <ctype.h>
  49 #include <stdio.h>
  50 #include <string.h>
  51 #include <arpa/inet.h>
  52
  53 #include "interface.h"
  54 #include "addrtoname.h"
  55 #include "dhcp6.h"
  56 #include "dhcp6opt.h"
  57
  58 #if 0
  59 static void dhcp6opttab_init(void);
  60 static struct dhcp6_opt *dhcp6opttab_byname(char *);
  61 #endif
  62 static struct dhcp6_opt *dhcp6opttab_bycode(u_int);
  63
  64 static const char tstr[] = " [|dhcp6]";
  65
  66 static struct dhcp6_opt dh6opttab[] = {
  67         /* IP Address Extension */
  68         { 1, OL6_N,     "IP Address",                   OT6_NONE, },
  69
  70         /* General Extension */
  71         { 8193, OL6_N,  "IEEE 1003.1 POSIX Timezone",   OT6_STR, },
  72         { 8194, OL6_16N, "Domain Name Server",          OT6_V6, },
  73         { 8195, OL6_N,  "Domain Name",                  OT6_STR, },
  74
  75         { 8196, OL6_N,  "SLP Agent",                    OT6_NONE, },
  76         { 8197, OL6_N,  "SLP Scope"     ,               OT6_NONE, },
  77         { 8198, OL6_16N, "Network Time Protocol Servers", OT6_V6, },
  78         { 8199, OL6_N,  "NIS Domain",                   OT6_STR, },
  79         { 8200, OL6_16N, "NIS Servers",                 OT6_V6, },
  80         { 8201, OL6_N,  "NIS+ Domain",                  OT6_STR, },
  81         { 8202, OL6_16N, "NIS+ Servers",                OT6_V6, },
  82
  83         /* TCP Parameters */
  84         { 8203, 4,      "TCP Keepalive Interval",       OT6_NUM, },
  85
  86         /* DHCPv6 Extensions */
  87         { 8204, 4,      "Maximum DHCPv6 Message Size",  OT6_NUM, },
  88         { 8205, OL6_N,  "DHCP Retransmission and Configuration Parameter",
  89                                                         OT6_NONE, },
  90         { 8206, OL6_N,  "Extension Request",            OT6_NONE, },
  91         { 8207, OL6_N,  "Subnet Prefix",                OT6_NONE, },
  92         { 8208, OL6_N,  "Platform Specific Information", OT6_NONE, },
  93         { 8209, OL6_N,  "Platform Class Identifier",    OT6_STR, },
  94         { 8210, OL6_N,  "Class Identifier",             OT6_STR, },
  95         { 8211, 16,     "Reconfigure Multicast Address", OT6_V6, },
  96         { 8212, 16,     "Renumber DHCPv6 Server Address",
  97                                                         OT6_V6, },
  98         { 8213, OL6_N,  "Client-Server Authentication", OT6_NONE, },
  99         { 8214, 4,      "Client Key Selection",         OT6_NUM, },
 100
 101         /* End Extension */
 102         { 65536, OL6_Z, "End",                          OT6_NONE, },
 103
 104         { 0 },
 105 };
 106
 107 #if 0
 108 static struct dhcp6_opt *dh6o_pad;
 109 static struct dhcp6_opt *dh6o_end;
 110
 111 static void
 112 dhcp6opttab_init()
 113 {
 114         dh6o_pad = dhcp6opttab_bycode(0);
 115         dh6o_end = dhcp6opttab_bycode(65536);
 116 }
 117 #endif
 118
 119 #if 0
 120 static struct dhcp6_opt *
 121 dhcp6opttab_byname(name)
 122         char *name;
 123 {
 124         struct dhcp6_opt *p;
 125
 126         for (p = dh6opttab; p->code; p++)
 127                 if (strcmp(name, p->name) == 0)
 128                         return p;
 129         return NULL;
 130 }
 131 #endif
 132
 133 static struct dhcp6_opt *
 134 dhcp6opttab_bycode(code)
 135         u_int code;
 136 {
 137         struct dhcp6_opt *p;
 138
 139         for (p = dh6opttab; p->code; p++)
 140                 if (p->code == code)
 141                         return p;
 142         return NULL;
 143 }
 144
 145 static void
 146 dhcp6ext_print(u_char *cp, u_char *ep)
 147 {
 148         u_int16_t code, len;
 149         struct dhcp6_opt *p;
 150         char buf[BUFSIZ];
 151         int i;
 152
 153         if (cp == ep)
 154                 return;
 155         while (cp < ep) {
 156                 if (ep - cp < sizeof(u_int16_t))
 157                         break;
 158                 code = ntohs(*(u_int16_t *)&cp[0]);
 159                 if (ep - cp < sizeof(u_int16_t) * 2)
 160                         break;
 161                 if (code != 65535)
 162                         len = ntohs(*(u_int16_t *)&cp[2]);
 163                 else
 164                         len = 0;
 165                 if (ep - cp < len + 4)
 166                         break;
 167                 p = dhcp6opttab_bycode(code);
 168                 if (p == NULL) {
 169                         printf("(unknown, len=%d)", len);
 170                         cp += len + 4;
 171                         continue;
 172                 }
 173
 174                 /* sanity check on length */
 175                 switch (p->len) {
 176                 case OL6_N:
 177                         break;
 178                 case OL6_16N:
 179                         if (len % 16 != 0)
 180                                 goto trunc;
 181                         break;
 182                 case OL6_Z:
 183                         if (len != 0)
 184                                 goto trunc;
 185                         break;
 186                 default:
 187                         if (len != p->len)
 188                                 goto trunc;
 189                         break;
 190                 }
 191                 if (cp + 4 + len > ep) {
 192                         printf(" [|%s]", p->name);
 193                         return;
 194                 }
 195
 196                 printf(" (%s, ", p->name);
 197                 switch (p->type) {
 198                 case OT6_V6:
 199                         for (i = 0; i < len; i += 16) {
 200                                 inet_ntop(AF_INET6, &cp[4 + i], buf,
 201                                         sizeof(buf));
 202                                 if (i != 0)
 203                                         printf(",");
 204                                 printf("%s", buf);
 205                         }
 206                         break;
 207                 case OT6_STR:
 208                         memset(&buf, 0, sizeof(buf));
 209                         strncpy(buf, &cp[4], len);
 210                         printf("%s", buf);
 211                         break;
 212                 case OT6_NUM:
 213                         printf("%d", (u_int32_t)ntohl(*(u_int32_t *)&cp[4]));
 214                         break;
 215                 default:
 216                         for (i = 0; i < len; i++)
 217                                 printf("%02x", cp[4 + i] & 0xff);
 218                 }
 219                 printf(")");
 220                 cp += len + 4;
 221         }
 222         return;
 223
 224 trunc:
 225         printf("[|dhcp6ext]");
 226 }
 227
 228 /*
 229  * Print dhcp6 requests
 230  */
 231 void
 232 dhcp6_print(register const u_char *cp, u_int length,
 233             u_int16_t sport, u_int16_t dport)
 234 {
 235         union dhcp6 *dh6;
 236         u_char *ep;
 237         u_char *extp;
 238         u_int16_t field16;
 239
 240         printf("dhcp6");
 241
 242         ep = (u_char *)snapend;
 243
 244         dh6 = (union dhcp6 *)cp;
 245         TCHECK(dh6->dh6_msgtype);
 246         switch (dh6->dh6_msgtype) {
 247         case DH6_SOLICIT:
 248                 if (!(vflag && TTEST(dh6->dh6_sol.dh6sol_relayaddr))) {
 249                         printf(" solicit");
 250                         break;
 251                 }
 252
 253                 printf(" solicit (");   /*)*/
 254                 if (dh6->dh6_sol.dh6sol_flags != 0) {
 255                         u_int8_t f = dh6->dh6_sol.dh6sol_flags;
 256                         printf("%s%s ",
 257                            (f & DH6SOL_PREFIX) ? "P" : "",
 258                            (f & DH6SOL_CLOSE) ? "C" : "");
 259                 }
 260
 261                 memcpy(&field16, &dh6->dh6_sol.dh6sol_plen_id,
 262                        sizeof(field16));
 263                 field16 = ntohs(field16);
 264                 if (field16 & ~DH6SOL_SOLICIT_PLEN_MASK)
 265                         printf("plen=%d ", DH6SOL_SOLICIT_PLEN(field16));
 266                 printf("solicit-ID=%d", DH6SOL_SOLICIT_ID(field16));
 267
 268                 printf(" cliaddr=%s",
 269                         ip6addr_string(&dh6->dh6_sol.dh6sol_cliaddr));
 270                 printf(" relayaddr=%s",
 271                         ip6addr_string(&dh6->dh6_sol.dh6sol_relayaddr));
 272                 /*(*/
 273                 printf(")");
 274                 break;
 275         case DH6_ADVERT:
 276                 if (!(vflag && TTEST(dh6->dh6_adv.dh6adv_serveraddr))) {
 277                         printf(" advert");
 278                         break;
 279                 }
 280                 printf(" advert (");    /*)*/
 281                 memcpy(&field16, &dh6->dh6_adv.dh6adv_rsv_id, sizeof(field16));
 282                 printf("solicit-ID=%d",
 283                        ntohs(field16) & DH6SOL_SOLICIT_ID_MASK);
 284                 printf(" pref=%u", dh6->dh6_adv.dh6adv_pref);
 285                 printf(" cliaddr=%s",
 286                         ip6addr_string(&dh6->dh6_adv.dh6adv_cliaddr));
 287                 printf(" relayaddr=%s",
 288                         ip6addr_string(&dh6->dh6_adv.dh6adv_relayaddr));
 289                 printf(" servaddr=%s",
 290                         ip6addr_string(&dh6->dh6_adv.dh6adv_serveraddr));
 291                 extp = (u_char *)((&dh6->dh6_adv) + 1);
 292                 dhcp6ext_print(extp, ep);
 293                 /*(*/
 294                 printf(")");
 295                 break;
 296         case DH6_REQUEST:
 297                 if (!(vflag && TTEST(dh6->dh6_req.dh6req_relayaddr))) {
 298                         printf(" request");
 299                         break;
 300                 }
 301                 printf(" request (");   /*)*/
 302                 if (dh6->dh6_req.dh6req_flags != 0) {
 303                         u_int8_t f = dh6->dh6_req.dh6req_flags;
 304                         printf("%s%s ",
 305                            (f & DH6REQ_CLOSE) ? "C" : "",
 306                            (f & DH6REQ_REBOOT) ? "R" : "");
 307                 }
 308                 printf("xid=0x%04x", dh6->dh6_req.dh6req_xid);
 309                 printf(" cliaddr=%s",
 310                        ip6addr_string(&dh6->dh6_req.dh6req_cliaddr));
 311                 printf(" relayaddr=%s",
 312                        ip6addr_string(&dh6->dh6_req.dh6req_relayaddr));
 313                 printf(" servaddr=%s",
 314                        ip6addr_string(&dh6->dh6_req.dh6req_serveraddr));
 315                 dhcp6ext_print((char *)(&dh6->dh6_req + 1), ep);
 316                 /*(*/
 317                 printf(")");
 318                 break;
 319         case DH6_REPLY:
 320                 if (!(vflag && TTEST(dh6->dh6_rep.dh6rep_xid))) {
 321                         printf(" reply");
 322                         break;
 323                 }
 324                 printf(" reply (");     /*)*/
 325                 if ((dh6->dh6_rep.dh6rep_flagandstat & DH6REP_RELAYPRESENT) != 0)
 326                         printf("R ");
 327                 printf("stat=0x%02x",
 328                         dh6->dh6_rep.dh6rep_flagandstat & DH6REP_STATMASK);
 329                 printf(" xid=0x%04x", dh6->dh6_rep.dh6rep_xid);
 330                 printf(" cliaddr=%s",
 331                        ip6addr_string(&dh6->dh6_rep.dh6rep_cliaddr));
 332                 extp = (u_char *)((&dh6->dh6_rep) + 1);
 333                 if ((dh6->dh6_rep.dh6rep_flagandstat & DH6REP_RELAYPRESENT) !=
 334                     0) {
 335                         printf(" relayaddr=%s", ip6addr_string(extp));
 336                         extp += sizeof(struct in6_addr);
 337                 }
 338                 dhcp6ext_print(extp, ep);
 339                 /*(*/
 340                 printf(")");
 341                 break;
 342         case DH6_RELEASE:
 343                 printf(" release");
 344                 break;
 345         case DH6_RECONFIG:
 346                 printf(" reconfig");
 347                 break;
 348         }
 349         return;
 350
 351 trunc:
 352         printf("%s", tstr);
 353 }