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 1.3 1999/12/22 06:27:20 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_short sport, u_short 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 } 343