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 1.2 1999-11-21 09:36:50 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 #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
  58 #include "interface.h"
  59 #include "addrtoname.h"
  60 #include "dhcp6.h"
  61 #include "dhcp6opt.h"
  62
  63 #if 0
  64 static void dhcp6opttab_init __P((void));
  65 #endif
  66 static struct dhcp6_opt *dhcp6opttab_byname __P((char *));
  67 static struct dhcp6_opt *dhcp6opttab_bycode __P((u_int));
  68
  69 static char tstr[] = " [|dhcp6]";
  70
  71 static struct dhcp6_opt dh6opttab[] = {
  72         /* IP Address Extension */
  73         { 1, OL6_N,     "IP Address",                   OT6_NONE, },
  74
  75         /* General Extension */
  76         { 2, 4,         "Time Offset",                  OT6_NUM, },
  77         { 3, OL6_N,     "IEEE 1003.1 POSIX Timezone",   OT6_STR, },
  78         { 6, OL6_16N,   "Domain Name Server",           OT6_V6, },
  79         { 10, OL6_N,    "Domain Name",                  OT6_STR, },
  80
  81         /* Application and Service Parameters */
  82         { 16, OL6_N,    "Directory Agent",              OT6_NONE, },
  83         { 17, OL6_N,    "Service Scope" ,               OT6_NONE, },
  84         { 18, OL6_16N,  "Network Time Protocol Servers", OT6_V6, },
  85         { 19, OL6_N,    "NIS Domain",                   OT6_STR, },
  86         { 20, OL6_16N,  "NIS Servers",                  OT6_V6, },
  87         { 21, OL6_N,    "NIS+ Domain",                  OT6_STR, },
  88         { 22, OL6_16N,  "NIS+ Servers",                 OT6_V6, },
  89
  90         /* TCP Parameters */
  91         { 32, 4,        "TCP Keepalive Interval",       OT6_NUM, },
  92
  93         /* DHCPv6 Extensions */
  94         { 40, 4,        "Maximum DHCPv6 Message Size",  OT6_NUM, },
  95         { 41, OL6_N,    "DHCP Retransmission and Configuration Parameter",
  96                                                         OT6_NONE, },
  97         { 48, OL6_N,    "Platform Specific Information", OT6_NONE, },
  98         { 49, OL6_N,    "Platform Class Identifier",    OT6_STR, },
  99         { 64, OL6_N,    "Class Identifier",             OT6_STR, },
 100         { 66, 16,       "Reconfigure Multicast Address", OT6_V6, },
 101         { 67, 16,       "Renumber DHCPv6 Server Address",
 102                                                         OT6_V6, },
 103         { 68, OL6_N,    "DHCP Relay ICMP Error Message", OT6_NONE, },
 104         { 84, OL6_N,    "Client-Server Authentication", OT6_NONE, },
 105         { 85, 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 static struct dhcp6_opt *
 126 dhcp6opttab_byname(name)
 127         char *name;
 128 {
 129         struct dhcp6_opt *p;
 130
 131         for (p = dh6opttab; p->code; p++)
 132                 if (strcmp(name, p->name) == 0)
 133                         return p;
 134         return NULL;
 135 }
 136
 137 static struct dhcp6_opt *
 138 dhcp6opttab_bycode(code)
 139         u_int code;
 140 {
 141         struct dhcp6_opt *p;
 142
 143         for (p = dh6opttab; p->code; p++)
 144                 if (p->code == code)
 145                         return p;
 146         return NULL;
 147 }
 148
 149 static void
 150 dhcp6ext_print(u_char *cp, u_char *ep)
 151 {
 152         u_int16_t code, len;
 153         struct dhcp6_opt *p;
 154         char *q;
 155         char buf[BUFSIZ];
 156         int i;
 157
 158         if (cp == ep)
 159                 return;
 160         printf(" ");
 161         while (cp < ep) {
 162                 code = ntohs(*(u_int16_t *)&cp[0]);
 163                 if (code != 65535)
 164                         len = ntohs(*(u_int16_t *)&cp[2]);
 165                 else
 166                         len = 0;
 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_short sport, u_short dport)
 234 {
 235         union dhcp6 *dh6;
 236         u_char *ep;
 237         u_char *extp;
 238
 239         printf("dhcp6");
 240
 241         ep = (u_char *)snapend;
 242
 243         dh6 = (union dhcp6 *)cp;
 244         TCHECK(dh6->dh6_msgtype);
 245         switch (dh6->dh6_msgtype) {
 246         case DH6_SOLICIT:
 247                 if (vflag && TTEST(dh6->dh6_sol.dh6sol_relayaddr)) {
 248                         printf(" solicit(");
 249                         if ((dh6->dh6_sol.dh6sol_flags & DH6SOL_CLOSE) != 0)
 250                                 printf("C");
 251                         if (dh6->dh6_sol.dh6sol_flags != 0)
 252                                 printf(" ");
 253                         printf("cliaddr=%s",
 254                                 ip6addr_string(&dh6->dh6_sol.dh6sol_cliaddr));
 255                         printf(" relayaddr=%s",
 256                                 ip6addr_string(&dh6->dh6_sol.dh6sol_relayaddr));
 257                         printf(")");
 258                 } else
 259                         printf(" solicit");
 260                 break;
 261         case DH6_ADVERT:
 262                 if (!(vflag && TTEST(dh6->dh6_adv.dh6adv_serveraddr))) {
 263                         printf(" advert");
 264                         break;
 265                 }
 266                 printf(" advert(");
 267                 if ((dh6->dh6_adv.dh6adv_flags & DH6ADV_SERVPRESENT) != 0)
 268                         printf("S");
 269                 if (dh6->dh6_adv.dh6adv_flags != 0)
 270                         printf(" ");
 271                 printf("pref=%u", dh6->dh6_adv.dh6adv_pref);
 272                 printf(" cliaddr=%s",
 273                         ip6addr_string(&dh6->dh6_adv.dh6adv_cliaddr));
 274                 printf(" relayaddr=%s",
 275                         ip6addr_string(&dh6->dh6_adv.dh6adv_relayaddr));
 276                 printf(" servaddr=%s",
 277                         ip6addr_string(&dh6->dh6_adv.dh6adv_serveraddr));
 278                 extp = (u_char *)((&dh6->dh6_adv) + 1);
 279                 dhcp6ext_print(extp, ep);
 280                 printf(")");
 281                 break;
 282         case DH6_REQUEST:
 283                 if (!(vflag && TTEST(dh6->dh6_req.dh6req_relayaddr))) {
 284                         printf(" request");
 285                         break;
 286                 }
 287                 printf(" request(");
 288                 if ((dh6->dh6_req.dh6req_flags & DH6REQ_CLOSE) != 0)
 289                         printf("C");
 290                 if ((dh6->dh6_req.dh6req_flags & DH6REQ_SERVPRESENT) != 0)
 291                         printf("S");
 292                 if ((dh6->dh6_req.dh6req_flags & DH6REQ_REBOOT) != 0)
 293                         printf("R");
 294                 if (dh6->dh6_req.dh6req_flags != 0)
 295                         printf(" ");
 296                 printf("xid=0x%04x", dh6->dh6_req.dh6req_xid);
 297                 printf(" cliaddr=%s",
 298                         ip6addr_string(&dh6->dh6_req.dh6req_cliaddr));
 299                 printf(" relayaddr=%s",
 300                         ip6addr_string(&dh6->dh6_req.dh6req_relayaddr));
 301                 extp = (char *)((&dh6->dh6_req) + 1);
 302                 if ((dh6->dh6_req.dh6req_flags & DH6REQ_SERVPRESENT) != 0) {
 303                         printf(" servaddr=%s", ip6addr_string(extp));
 304                         extp += 16;
 305                 }
 306                 dhcp6ext_print(extp, ep);
 307                 printf(")");
 308                 break;
 309         case DH6_REPLY:
 310                 if (!(vflag && TTEST(dh6->dh6_rep.dh6rep_xid))) {
 311                         printf(" reply");
 312                         break;
 313                 }
 314                 printf(" reply(");
 315                 if ((dh6->dh6_rep.dh6rep_flagandstat & DH6REP_CLIPRESENT) != 0)
 316                         printf("C");
 317                 if (dh6->dh6_rep.dh6rep_flagandstat != 0)
 318                         printf(" ");
 319                 printf("stat=0x%02x",
 320                         dh6->dh6_rep.dh6rep_flagandstat & DH6REP_STATMASK);
 321                 extp = (u_char *)((&dh6->dh6_rep) + 1);
 322                 if ((dh6->dh6_rep.dh6rep_flagandstat & DH6REP_CLIPRESENT) != 0) {
 323                         printf(" cliaddr=%s", ip6addr_string(extp));
 324                         extp += 16;
 325                 }
 326                 dhcp6ext_print(extp, ep);
 327                 printf(")");
 328                 break;
 329         case DH6_RELEASE:
 330                 printf(" release");
 331                 break;
 332         case DH6_RECONFIG:
 333                 printf(" reconfig");
 334                 break;
 335         }
 336         return;
 337
 338 trunc:
 339         printf("%s", tstr);
 340 }