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 1.4 2000-04-28 11:14:47 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         { 2, 4,         "Time Offset",                  OT6_NUM, },
  78         { 3, OL6_N,     "IEEE 1003.1 POSIX Timezone",   OT6_STR, },
  79         { 6, OL6_16N,   "Domain Name Server",           OT6_V6, },
  80         { 10, OL6_N,    "Domain Name",                  OT6_STR, },
  81
  82         /* Application and Service Parameters */
  83         { 16, OL6_N,    "Directory Agent",              OT6_NONE, },
  84         { 17, OL6_N,    "Service Scope" ,               OT6_NONE, },
  85         { 18, OL6_16N,  "Network Time Protocol Servers", OT6_V6, },
  86         { 19, OL6_N,    "NIS Domain",                   OT6_STR, },
  87         { 20, OL6_16N,  "NIS Servers",                  OT6_V6, },
  88         { 21, OL6_N,    "NIS+ Domain",                  OT6_STR, },
  89         { 22, OL6_16N,  "NIS+ Servers",                 OT6_V6, },
  90
  91         /* TCP Parameters */
  92         { 32, 4,        "TCP Keepalive Interval",       OT6_NUM, },
  93
  94         /* DHCPv6 Extensions */
  95         { 40, 4,        "Maximum DHCPv6 Message Size",  OT6_NUM, },
  96         { 41, OL6_N,    "DHCP Retransmission and Configuration Parameter",
  97                                                         OT6_NONE, },
  98         { 48, OL6_N,    "Platform Specific Information", OT6_NONE, },
  99         { 49, OL6_N,    "Platform Class Identifier",    OT6_STR, },
 100         { 64, OL6_N,    "Class Identifier",             OT6_STR, },
 101         { 66, 16,       "Reconfigure Multicast Address", OT6_V6, },
 102         { 67, 16,       "Renumber DHCPv6 Server Address",
 103                                                         OT6_V6, },
 104         { 68, OL6_N,    "DHCP Relay ICMP Error Message", OT6_NONE, },
 105         { 84, OL6_N,    "Client-Server Authentication", OT6_NONE, },
 106         { 85, 4,        "Client Key Selection",         OT6_NUM, },
 107
 108         /* End Extension */
 109         { 65536, OL6_Z, "End",                          OT6_NONE, },
 110
 111         { 0 },
 112 };
 113
 114 #if 0
 115 static struct dhcp6_opt *dh6o_pad;
 116 static struct dhcp6_opt *dh6o_end;
 117
 118 static void
 119 dhcp6opttab_init()
 120 {
 121         dh6o_pad = dhcp6opttab_bycode(0);
 122         dh6o_end = dhcp6opttab_bycode(65536);
 123 }
 124 #endif
 125
 126 #if 0
 127 static struct dhcp6_opt *
 128 dhcp6opttab_byname(name)
 129         char *name;
 130 {
 131         struct dhcp6_opt *p;
 132
 133         for (p = dh6opttab; p->code; p++)
 134                 if (strcmp(name, p->name) == 0)
 135                         return p;
 136         return NULL;
 137 }
 138 #endif
 139
 140 static struct dhcp6_opt *
 141 dhcp6opttab_bycode(code)
 142         u_int code;
 143 {
 144         struct dhcp6_opt *p;
 145
 146         for (p = dh6opttab; p->code; p++)
 147                 if (p->code == code)
 148                         return p;
 149         return NULL;
 150 }
 151
 152 static void
 153 dhcp6ext_print(u_char *cp, u_char *ep)
 154 {
 155         u_int16_t code, len;
 156         struct dhcp6_opt *p;
 157         char buf[BUFSIZ];
 158         int i;
 159
 160         if (cp == ep)
 161                 return;
 162         printf(" ");
 163         while (cp < ep) {
 164                 code = ntohs(*(u_int16_t *)&cp[0]);
 165                 if (code != 65535)
 166                         len = ntohs(*(u_int16_t *)&cp[2]);
 167                 else
 168                         len = 0;
 169                 p = dhcp6opttab_bycode(code);
 170                 if (p == NULL) {
 171                         printf("(unknown, len=%d)", len);
 172                         cp += len + 4;
 173                         continue;
 174                 }
 175
 176                 /* sanity check on length */
 177                 switch (p->len) {
 178                 case OL6_N:
 179                         break;
 180                 case OL6_16N:
 181                         if (len % 16 != 0)
 182                                 goto trunc;
 183                         break;
 184                 case OL6_Z:
 185                         if (len != 0)
 186                                 goto trunc;
 187                         break;
 188                 default:
 189                         if (len != p->len)
 190                                 goto trunc;
 191                         break;
 192                 }
 193                 if (cp + 4 + len > ep) {
 194                         printf("[|%s]", p->name);
 195                         return;
 196                 }
 197
 198                 printf("(%s, ", p->name);
 199                 switch (p->type) {
 200                 case OT6_V6:
 201                         for (i = 0; i < len; i += 16) {
 202                                 inet_ntop(AF_INET6, &cp[4 + i], buf,
 203                                         sizeof(buf));
 204                                 if (i != 0)
 205                                         printf(",");
 206                                 printf("%s", buf);
 207                         }
 208                         break;
 209                 case OT6_STR:
 210                         memset(&buf, 0, sizeof(buf));
 211                         strncpy(buf, &cp[4], len);
 212                         printf("%s", buf);
 213                         break;
 214                 case OT6_NUM:
 215                         printf("%d", (u_int32_t)ntohl(*(u_int32_t *)&cp[4]));
 216                         break;
 217                 default:
 218                         for (i = 0; i < len; i++)
 219                                 printf("%02x", cp[4 + i] & 0xff);
 220                 }
 221                 printf(")");
 222                 cp += len + 4;
 223         }
 224         return;
 225
 226 trunc:
 227         printf("[|dhcp6ext]");
 228 }
 229
 230 /*
 231  * Print dhcp6 requests
 232  */
 233 void
 234 dhcp6_print(register const u_char *cp, u_int length,
 235             u_int16_t sport, u_int16_t dport)
 236 {
 237         union dhcp6 *dh6;
 238         u_char *ep;
 239         u_char *extp;
 240
 241         printf("dhcp6");
 242
 243         ep = (u_char *)snapend;
 244
 245         dh6 = (union dhcp6 *)cp;
 246         TCHECK(dh6->dh6_msgtype);
 247         switch (dh6->dh6_msgtype) {
 248         case DH6_SOLICIT:
 249                 if (vflag && TTEST(dh6->dh6_sol.dh6sol_relayaddr)) {
 250                         printf(" solicit(");
 251                         if ((dh6->dh6_sol.dh6sol_flags & DH6SOL_CLOSE) != 0)
 252                                 printf("C");
 253                         if (dh6->dh6_sol.dh6sol_flags != 0)
 254                                 printf(" ");
 255                         printf("cliaddr=%s",
 256                                 ip6addr_string(&dh6->dh6_sol.dh6sol_cliaddr));
 257                         printf(" relayaddr=%s",
 258                                 ip6addr_string(&dh6->dh6_sol.dh6sol_relayaddr));
 259                         printf(")");
 260                 } else
 261                         printf(" solicit");
 262                 break;
 263         case DH6_ADVERT:
 264                 if (!(vflag && TTEST(dh6->dh6_adv.dh6adv_serveraddr))) {
 265                         printf(" advert");
 266                         break;
 267                 }
 268                 printf(" advert(");
 269                 if ((dh6->dh6_adv.dh6adv_flags & DH6ADV_SERVPRESENT) != 0)
 270                         printf("S");
 271                 if (dh6->dh6_adv.dh6adv_flags != 0)
 272                         printf(" ");
 273                 printf("pref=%u", dh6->dh6_adv.dh6adv_pref);
 274                 printf(" cliaddr=%s",
 275                         ip6addr_string(&dh6->dh6_adv.dh6adv_cliaddr));
 276                 printf(" relayaddr=%s",
 277                         ip6addr_string(&dh6->dh6_adv.dh6adv_relayaddr));
 278                 printf(" servaddr=%s",
 279                         ip6addr_string(&dh6->dh6_adv.dh6adv_serveraddr));
 280                 extp = (u_char *)((&dh6->dh6_adv) + 1);
 281                 dhcp6ext_print(extp, ep);
 282                 printf(")");
 283                 break;
 284         case DH6_REQUEST:
 285                 if (!(vflag && TTEST(dh6->dh6_req.dh6req_relayaddr))) {
 286                         printf(" request");
 287                         break;
 288                 }
 289                 printf(" request(");
 290                 if ((dh6->dh6_req.dh6req_flags & DH6REQ_CLOSE) != 0)
 291                         printf("C");
 292                 if ((dh6->dh6_req.dh6req_flags & DH6REQ_SERVPRESENT) != 0)
 293                         printf("S");
 294                 if ((dh6->dh6_req.dh6req_flags & DH6REQ_REBOOT) != 0)
 295                         printf("R");
 296                 if (dh6->dh6_req.dh6req_flags != 0)
 297                         printf(" ");
 298                 printf("xid=0x%04x", dh6->dh6_req.dh6req_xid);
 299                 printf(" cliaddr=%s",
 300                         ip6addr_string(&dh6->dh6_req.dh6req_cliaddr));
 301                 printf(" relayaddr=%s",
 302                         ip6addr_string(&dh6->dh6_req.dh6req_relayaddr));
 303                 extp = (char *)((&dh6->dh6_req) + 1);
 304                 if ((dh6->dh6_req.dh6req_flags & DH6REQ_SERVPRESENT) != 0) {
 305                         printf(" servaddr=%s", ip6addr_string(extp));
 306                         extp += 16;
 307                 }
 308                 dhcp6ext_print(extp, ep);
 309                 printf(")");
 310                 break;
 311         case DH6_REPLY:
 312                 if (!(vflag && TTEST(dh6->dh6_rep.dh6rep_xid))) {
 313                         printf(" reply");
 314                         break;
 315                 }
 316                 printf(" reply(");
 317                 if ((dh6->dh6_rep.dh6rep_flagandstat & DH6REP_CLIPRESENT) != 0)
 318                         printf("C");
 319                 if (dh6->dh6_rep.dh6rep_flagandstat != 0)
 320                         printf(" ");
 321                 printf("stat=0x%02x",
 322                         dh6->dh6_rep.dh6rep_flagandstat & DH6REP_STATMASK);
 323                 extp = (u_char *)((&dh6->dh6_rep) + 1);
 324                 if ((dh6->dh6_rep.dh6rep_flagandstat & DH6REP_CLIPRESENT) != 0) {
 325                         printf(" cliaddr=%s", ip6addr_string(extp));
 326                         extp += 16;
 327                 }
 328                 dhcp6ext_print(extp, ep);
 329                 printf(")");
 330                 break;
 331         case DH6_RELEASE:
 332                 printf(" release");
 333                 break;
 334         case DH6_RECONFIG:
 335                 printf(" reconfig");
 336                 break;
 337         }
 338         return;
 339
 340 trunc:
 341         printf("%s", tstr);
 342 }