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 } 354