packet-bootp.c

   1 /* packet-bootp.c
   2  * Routines for BOOTP/DHCP packet disassembly
   3  * Gilbert Ramirez <gram@alumni.rice.edu>
   4  *
   5  * $Id: packet-bootp.c,v 1.58 2001/12/03 03:59:33 guy Exp $
   6  *
   7  * The information used comes from:
   8  * RFC  951: Bootstrap Protocol
   9  * RFC 1542: Clarifications and Extensions for the Bootstrap Protocol
  10  * RFC 2131: Dynamic Host Configuration Protocol
  11  * RFC 2132: DHCP Options and BOOTP Vendor Extensions
  12  * RFC 2489: Procedure for Defining New DHCP Options
  13  * RFC 3046: DHCP Relay Agent Information Option
  14  * RFC 3118: Authentication for DHCP Messages
  15  * BOOTP and DHCP Parameters
  16  *     http://www.iana.org/assignments/bootp-dhcp-parameters
  17  *
  18  * Ethereal - Network traffic analyzer
  19  * By Gerald Combs <gerald@ethereal.com>
  20  * Copyright 1998 Gerald Combs
  21  *
  22  * This program is free software; you can redistribute it and/or
  23  * modify it under the terms of the GNU General Public License
  24  * as published by the Free Software Foundation; either version 2
  25  * of the License, or (at your option) any later version.
  26  *
  27  * This program is distributed in the hope that it will be useful,
  28  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  29  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  30  * GNU General Public License for more details.
  31  *
  32  * You should have received a copy of the GNU General Public License
  33  * along with this program; if not, write to the Free Software
  34  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  35  */
  36
  37 #ifdef HAVE_CONFIG_H
  38 # include "config.h"
  39 #endif
  40
  41 #ifdef HAVE_SYS_TYPES_H
  42 # include <sys/types.h>
  43 #endif
  44
  45 #include <string.h>
  46 #include <glib.h>
  47 #include "int-64bit.h"
  48 #include "packet.h"
  49 #include "packet-arp.h"
  50
  51 static int proto_bootp = -1;
  52 static int hf_bootp_type = -1;
  53 static int hf_bootp_hw_type = -1;
  54 static int hf_bootp_hw_len = -1;
  55 static int hf_bootp_hops = -1;
  56 static int hf_bootp_id = -1;
  57 static int hf_bootp_secs = -1;
  58 static int hf_bootp_flag = -1;
  59 static int hf_bootp_ip_client = -1;
  60 static int hf_bootp_ip_your = -1;
  61 static int hf_bootp_ip_server = -1;
  62 static int hf_bootp_ip_relay = -1;
  63 static int hf_bootp_hw_addr = -1;
  64 static int hf_bootp_server = -1;
  65 static int hf_bootp_file = -1;
  66 static int hf_bootp_cookie = -1;
  67 static int hf_bootp_dhcp = -1;
  68
  69 static guint ett_bootp = -1;
  70 static guint ett_bootp_option = -1;
  71
  72 #define UDP_PORT_BOOTPS  67
  73
  74 enum field_type { none, ipv4, string, toggle, yes_no, special, opaque,
  75         time_in_secs,
  76         val_u_byte, val_u_short, val_u_le_short, val_u_long,
  77         val_s_long };
  78
  79 struct opt_info {
  80         char    *text;
  81         enum field_type ftype;
  82 };
  83
  84 #define NUM_OPT_INFOS 211
  85 #define NUM_O63_SUBOPTS 11
  86
  87 static int dissect_vendor_pxeclient_suboption(proto_tree *v_tree, tvbuff_t *tvb,
  88     int optp);
  89 static int dissect_netware_ip_suboption(proto_tree *v_tree, tvbuff_t *tvb,
  90     int optp);
  91 static int bootp_dhcp_decode_agent_info(proto_tree *v_tree, tvbuff_t *tvb,
  92     int optp);
  93
  94 static const char *
  95 get_dhcp_type(guint8 byte)
  96 {
  97         static const char       *opt53_text[] = {
  98                 "Unknown Message Type",
  99                 "Discover",
 100                 "Offer",
 101                 "Request",
 102                 "Decline",
 103                 "ACK",
 104                 "NAK",
 105                 "Release",
 106                 "Inform"
 107         };
 108         int i;
 109
 110         if (byte > 0 && byte < (sizeof opt53_text / sizeof opt53_text[0]))
 111                 i = byte;
 112         else
 113                 i = 0;
 114         return opt53_text[i];
 115 }
 116
 117 /* DHCP Authentication protocols */
 118 #define AUTHEN_PROTO_CONFIG_TOKEN       0
 119 #define AUTHEN_PROTO_DELAYED_AUTHEN     1
 120
 121 /* DHCP Authentication algorithms for delayed authentication */
 122 #define AUTHEN_DELAYED_ALGO_HMAC_MD5    1
 123
 124 /* DHCP Authentication Replay Detection Methods */
 125 #define AUTHEN_RDM_MONOTONIC_COUNTER    0x00
 126
 127 /* Returns the number of bytes consumed by this option. */
 128 static int
 129 bootp_option(tvbuff_t *tvb, proto_tree *bp_tree, int voff, int eoff,
 130     gboolean first_pass, const char **dhcp_type_p,
 131     const guint8 **vendor_class_id_p)
 132 {
 133         char                    *text;
 134         enum field_type         ftype;
 135         u_char                  code = tvb_get_guint8(tvb, voff);
 136         int                     vlen;
 137         u_char                  byte;
 138         int                     i,optp, consumed;
 139         u_long                  time_secs;
 140         proto_tree              *v_tree;
 141         proto_item              *vti;
 142         guint8                  protocol;
 143         guint8                  algorithm;
 144         guint8                  rdm;
 145
 146         static const value_string nbnt_vals[] = {
 147             {0x1,   "B-node" },
 148             {0x2,   "P-node" },
 149             {0x4,   "M-node" },
 150             {0x8,   "H-node" },
 151             {0,     NULL     } };
 152
 153         static const value_string authen_protocol_vals[] = {
 154             {AUTHEN_PROTO_CONFIG_TOKEN,   "configuration token" },
 155             {AUTHEN_PROTO_DELAYED_AUTHEN, "delayed authentication" },
 156             {0,                           NULL     } };
 157
 158         static const value_string authen_da_algo_vals[] = {
 159             {AUTHEN_DELAYED_ALGO_HMAC_MD5, "HMAC_MD5" },
 160             {0,                            NULL     } };
 161
 162         static const value_string authen_rdm_vals[] = {
 163             {AUTHEN_RDM_MONOTONIC_COUNTER, "Monotonically-increasing counter" },
 164             {0,                            NULL     } };
 165
 166         static struct opt_info opt[] = {
 167                 /*   0 */ { "Padding",                                                          none },
 168                 /*   1 */ { "Subnet Mask",                                                      ipv4 },
 169                 /*   2 */ { "Time Offset",                                                      val_s_long },
 170                 /*   3 */ { "Router",                                                           ipv4 },
 171                 /*   4 */ { "Time Server",                                                      ipv4 },
 172                 /*   5 */ { "Name Server",                                                      ipv4 },
 173                 /*   6 */ { "Domain Name Server",                                       ipv4 },
 174                 /*   7 */ { "Log Server",                                                       ipv4 },
 175                 /*   8 */ { "Cookie Server",                                            ipv4 },
 176                 /*   9 */ { "LPR Server",                                                       ipv4 },
 177                 /*  10 */ { "Impress Server",                                           ipv4 },
 178                 /*  11 */ { "Resource Location Server",                         ipv4 },
 179                 /*  12 */ { "Host Name",                                                        string },
 180                 /*  13 */ { "Boot File Size",                                           val_u_short },
 181                 /*  14 */ { "Merit Dump File",                                          string },
 182                 /*  15 */ { "Domain Name",                                                      string },
 183                 /*  16 */ { "Swap Server",                                                      ipv4 },
 184                 /*  17 */ { "Root Path",                                                        string },
 185                 /*  18 */ { "Extensions Path",                                          string },
 186                 /*  19 */ { "IP Forwarding",                                            toggle },
 187                 /*  20 */ { "Non-Local Source Routing",                         toggle },
 188                 /*  21 */ { "Policy Filter",                                            special },
 189                 /*  22 */ { "Maximum Datagram Reassembly Size",         val_u_short },
 190                 /*  23 */ { "Default IP Time-to-Live",                          val_u_byte },
 191                 /*  24 */ { "Path MTU Aging Timeout",                           time_in_secs },
 192                 /*  25 */ { "Path MTU Plateau Table",                           val_u_short },
 193                 /*  26 */ { "Interface MTU",                                            val_u_short },
 194                 /*  27 */ { "All Subnets are Local",                            yes_no },
 195                 /*  28 */ { "Broadcast Address",                                        ipv4 },
 196                 /*  29 */ { "Perform Mask Discovery",                           toggle },
 197                 /*  30 */ { "Mask Supplier",                                            yes_no },
 198                 /*  31 */ { "Perform Router Discover",                          toggle },
 199                 /*  32 */ { "Router Solicitation Address",                      ipv4 },
 200                 /*  33 */ { "Static Route",                                                     special },
 201                 /*  34 */ { "Trailer Encapsulation",                            toggle },
 202                 /*  35 */ { "ARP Cache Timeout",                                        time_in_secs },
 203                 /*  36 */ { "Ethernet Encapsulation",                           toggle },
 204                 /*  37 */ { "TCP Default TTL",                                          val_u_byte },
 205                 /*  38 */ { "TCP Keepalive Interval",                           time_in_secs },
 206                 /*  39 */ { "TCP Keepalive Garbage",                            toggle },
 207                 /*  40 */ { "Network Information Service Domain",       string },
 208                 /*  41 */ { "Network Information Service Servers",      ipv4 },
 209                 /*  42 */ { "Network Time Protocol Servers",            ipv4 },
 210                 /*  43 */ { "Vendor-Specific Information",                      special },
 211                 /*  44 */ { "NetBIOS over TCP/IP Name Server",          ipv4 },
 212                 /*  45 */ { "NetBIOS over TCP/IP Datagram Distribution Name Server", ipv4 },
 213                 /*  46 */ { "NetBIOS over TCP/IP Node Type",            special },
 214                 /*  47 */ { "NetBIOS over TCP/IP Scope",                        string },
 215                 /*  48 */ { "X Window System Font Server",                      ipv4 },
 216                 /*  49 */ { "X Window System Display Manager",          ipv4 },
 217                 /*  50 */ { "Requested IP Address",                                     ipv4 },
 218                 /*  51 */ { "IP Address Lease Time",                            time_in_secs },
 219                 /*  52 */ { "Option Overload",                                          special },
 220                 /*  53 */ { "DHCP Message Type",                                        special },
 221                 /*  54 */ { "Server Identifier",                                        ipv4 },
 222                 /*  55 */ { "Parameter Request List",                           special },
 223                 /*  56 */ { "Message",                                                          string },
 224                 /*  57 */ { "Maximum DHCP Message Size",                        val_u_short },
 225                 /*  58 */ { "Renewal Time Value",                                       time_in_secs },
 226                 /*  59 */ { "Rebinding Time Value",                                     time_in_secs },
 227                 /*  60 */ { "Vendor class identifier",                          special },
 228                 /*  61 */ { "Client identifier",                                        special },
 229                 /*  62 */ { "Novell/Netware IP domain",                                 string },
 230                 /*  63 */ { "Novell Options",   special },
 231                 /*  64 */ { "Network Information Service+ Domain",      string },
 232                 /*  65 */ { "Network Information Service+ Servers",     ipv4 },
 233                 /*  66 */ { "TFTP Server Name",                                         string },
 234                 /*  67 */ { "Bootfile name",                                            string },
 235                 /*  68 */ { "Mobile IP Home Agent",                                     ipv4 },
 236                 /*  69 */ { "SMTP Server",                                                      ipv4 },
 237                 /*  70 */ { "POP3 Server",                                                      ipv4 },
 238                 /*  71 */ { "NNTP Server",                                                      ipv4 },
 239                 /*  72 */ { "Default WWW Server",                                       ipv4 },
 240                 /*  73 */ { "Default Finger Server",                            ipv4 },
 241                 /*  74 */ { "Default IRC Server",                                       ipv4 },
 242                 /*  75 */ { "StreetTalk Server",                                        ipv4 },
 243                 /*  76 */ { "StreetTalk Directory Assistance Server", ipv4 },
 244                 /*  77 */ { "User Class Information",                           opaque },
 245                 /*  78 */ { "Directory Agent Information",                      opaque },
 246                 /*  79 */ { "Service Location Agent Scope",                     opaque },
 247                 /*  80 */ { "Naming Authority",                                         opaque },
 248                 /*  81 */ { "Client Fully Qualified Domain Name",       opaque },
 249                 /*  82 */ { "Agent Information Option",                 special },
 250                 /*  83 */ { "Unassigned",                               opaque },
 251                 /*  84 */ { "Unassigned",                               opaque },
 252                 /*  85 */ { "Novell Directory Services Servers",        opaque },
 253                 /*  86 */ { "Novell Directory Services Tree Name",      opaque },
 254                 /*  87 */ { "Novell Directory Services Context",        opaque },
 255                 /*  88 */ { "IEEE 1003.1 POSIX Timezone",                       opaque },
 256                 /*  89 */ { "Fully Qualified Domain Name",                      opaque },
 257                 /*  90 */ { "Authentication",                           special },
 258                 /*  91 */ { "Vines TCP/IP Server Option",                       opaque },
 259                 /*  92 */ { "Server Selection Option",                          opaque },
 260                 /*  93 */ { "Client System Architecture",                       opaque },
 261                 /*  94 */ { "Client Network Device Interface",          opaque },
 262                 /*  95 */ { "Lightweight Directory Access Protocol",    opaque },
 263                 /*  96 */ { "IPv6 Transitions",                                         opaque },
 264                 /*  97 */ { "UUID/GUID-based Client Identifier",        opaque },
 265                 /*  98 */ { "Open Group's User Authentication",         opaque },
 266                 /*  99 */ { "Unassigned",                                                       opaque },
 267                 /* 100 */ { "Printer Name",                                                     opaque },
 268                 /* 101 */ { "MDHCP multicast address",                          opaque },
 269                 /* 102 */ { "Removed/unassigned",                                       opaque },
 270                 /* 103 */ { "Removed/unassigned",                                       opaque },
 271                 /* 104 */ { "Removed/unassigned",                                       opaque },
 272                 /* 105 */ { "Removed/unassigned",                                       opaque },
 273                 /* 106 */ { "Removed/unassigned",                                       opaque },
 274                 /* 107 */ { "Removed/unassigned",                                       opaque },
 275                 /* 108 */ { "Swap Path Option",                                         opaque },
 276                 /* 109 */ { "Unassigned",                                                       opaque },
 277                 /* 110 */ { "IPX Compability",                                          opaque },
 278                 /* 111 */ { "Unassigned",                                                       opaque },
 279                 /* 112 */ { "Netinfo Parent Server Address",            opaque },
 280                 /* 113 */ { "Netinfo Parent Server Tag",                        opaque },
 281                 /* 114 */ { "URL",                                                                      opaque },
 282                 /* 115 */ { "DHCP Failover Protocol",                           opaque },
 283                 /* 116 */ { "DHCP Auto-Configuration",                          opaque },
 284                 /* 117 */ { "Unassigned",                                                       opaque },
 285                 /* 118 */ { "Unassigned",                                                       opaque },
 286                 /* 119 */ { "Unassigned",                                                       opaque },
 287                 /* 120 */ { "Unassigned",                                                       opaque },
 288                 /* 121 */ { "Unassigned",                                                       opaque },
 289                 /* 122 */ { "Unassigned",                                                       opaque },
 290                 /* 123 */ { "Unassigned",                                                       opaque },
 291                 /* 124 */ { "Unassigned",                                                       opaque },
 292                 /* 125 */ { "Unassigned",                                                       opaque },
 293                 /* 126 */ { "Extension",                                                        opaque },
 294                 /* 127 */ { "Extension",                                                        opaque },
 295                 /* 128 */ { "Private",                                  opaque },
 296                 /* 129 */ { "Private",                                  opaque },
 297                 /* 130 */ { "Private",                                  opaque },
 298                 /* 131 */ { "Private",                                  opaque },
 299                 /* 132 */ { "Private",                                  opaque },
 300                 /* 133 */ { "Private",                                  opaque },
 301                 /* 134 */ { "Private",                                  opaque },
 302                 /* 135 */ { "Private",                                  opaque },
 303                 /* 136 */ { "Private",                                  opaque },
 304                 /* 137 */ { "Private",                                  opaque },
 305                 /* 138 */ { "Private",                                  opaque },
 306                 /* 139 */ { "Private",                                  opaque },
 307                 /* 140 */ { "Private",                                  opaque },
 308                 /* 141 */ { "Private",                                  opaque },
 309                 /* 142 */ { "Private",                                  opaque },
 310                 /* 143 */ { "Private",                                  opaque },
 311                 /* 144 */ { "Private",                                  opaque },
 312                 /* 145 */ { "Private",                                  opaque },
 313                 /* 146 */ { "Private",                                  opaque },
 314                 /* 147 */ { "Private",                                  opaque },
 315                 /* 148 */ { "Private",                                  opaque },
 316                 /* 149 */ { "Private",                                  opaque },
 317                 /* 150 */ { "Private",                                  opaque },
 318                 /* 151 */ { "Private",                                  opaque },
 319                 /* 152 */ { "Private",                                  opaque },
 320                 /* 153 */ { "Private",                                  opaque },
 321                 /* 154 */ { "Private",                                  opaque },
 322                 /* 155 */ { "Private",                                  opaque },
 323                 /* 156 */ { "Private",                                  opaque },
 324                 /* 157 */ { "Private",                                  opaque },
 325                 /* 158 */ { "Private",                                  opaque },
 326                 /* 159 */ { "Private",                                  opaque },
 327                 /* 160 */ { "Private",                                  opaque },
 328                 /* 161 */ { "Private",                                  opaque },
 329                 /* 162 */ { "Private",                                  opaque },
 330                 /* 163 */ { "Private",                                  opaque },
 331                 /* 164 */ { "Private",                                  opaque },
 332                 /* 165 */ { "Private",                                  opaque },
 333                 /* 166 */ { "Private",                                  opaque },
 334                 /* 167 */ { "Private",                                  opaque },
 335                 /* 168 */ { "Private",                                  opaque },
 336                 /* 169 */ { "Private",                                  opaque },
 337                 /* 170 */ { "Private",                                  opaque },
 338                 /* 171 */ { "Private",                                  opaque },
 339                 /* 172 */ { "Private",                                  opaque },
 340                 /* 173 */ { "Private",                                  opaque },
 341                 /* 174 */ { "Private",                                  opaque },
 342                 /* 175 */ { "Private",                                  opaque },
 343                 /* 176 */ { "Private",                                  opaque },
 344                 /* 177 */ { "Private",                                  opaque },
 345                 /* 178 */ { "Private",                                  opaque },
 346                 /* 179 */ { "Private",                                  opaque },
 347                 /* 180 */ { "Private",                                  opaque },
 348                 /* 181 */ { "Private",                                  opaque },
 349                 /* 182 */ { "Private",                                  opaque },
 350                 /* 183 */ { "Private",                                  opaque },
 351                 /* 184 */ { "Private",                                  opaque },
 352                 /* 185 */ { "Private",                                  opaque },
 353                 /* 186 */ { "Private",                                  opaque },
 354                 /* 187 */ { "Private",                                  opaque },
 355                 /* 188 */ { "Private",                                  opaque },
 356                 /* 189 */ { "Private",                                  opaque },
 357                 /* 190 */ { "Private",                                  opaque },
 358                 /* 191 */ { "Private",                                  opaque },
 359                 /* 192 */ { "Private",                                  opaque },
 360                 /* 193 */ { "Private",                                  opaque },
 361                 /* 194 */ { "Private",                                  opaque },
 362                 /* 195 */ { "Private",                                  opaque },
 363                 /* 196 */ { "Private",                                  opaque },
 364                 /* 197 */ { "Private",                                  opaque },
 365                 /* 198 */ { "Private",                                  opaque },
 366                 /* 199 */ { "Private",                                  opaque },
 367                 /* 200 */ { "Private",                                  opaque },
 368                 /* 201 */ { "Private",                                  opaque },
 369                 /* 202 */ { "Private",                                  opaque },
 370                 /* 203 */ { "Private",                                  opaque },
 371                 /* 204 */ { "Private",                                  opaque },
 372                 /* 205 */ { "Private",                                  opaque },
 373                 /* 206 */ { "Private",                                  opaque },
 374                 /* 207 */ { "Private",                                  opaque },
 375                 /* 208 */ { "Private",                                  opaque },
 376                 /* 209 */ { "Private",                                  opaque },
 377                 /* 210 */ { "Authentication",                           special }
 378         };
 379
 380         /* Options whose length isn't "vlen + 2". */
 381         switch (code) {
 382
 383         case 0:         /* Padding */
 384                 /* check how much padding we have */
 385                 for (i = voff + 1; i < eoff; i++ ) {
 386                         if (tvb_get_guint8(tvb, i) != 0) {
 387                                 break;
 388                         }
 389                 }
 390                 i = i - voff;
 391                 if (!first_pass) {
 392                         if (bp_tree != NULL) {
 393                                 proto_tree_add_text(bp_tree, tvb, voff, i,
 394                                     "Padding");
 395                         }
 396                 }
 397                 consumed = i;
 398                 return consumed;
 399                 break;
 400
 401         case 255:       /* End Option */
 402                 if (!first_pass) {
 403                         if (bp_tree != NULL) {
 404                                 proto_tree_add_text(bp_tree, tvb, voff, 1,
 405                                     "End Option");
 406                         }
 407                 }
 408                 consumed = 1;
 409                 return consumed;
 410         }
 411
 412         /*
 413          * Get the length of the option, and the number of bytes it
 414          * consumes (the length doesn't include the option code or
 415          * length bytes).
 416          */
 417         vlen = tvb_get_guint8(tvb, voff+1);
 418         consumed = vlen + 2;
 419
 420         /*
 421          * In the first pass, we don't put anything into the protocol
 422          * tree; we just check for some options we have to look at
 423          * in order to properly process the packet:
 424          *
 425          *      53 (DHCP message type) - if this is present, this is DHCP
 426          *
 427          *      60 (Vendor class identifier) - we need this in order to
 428          *         interpret the vendor-specific info
 429          */
 430         if (first_pass) {
 431                 switch (code) {
 432
 433                 case 53:
 434                         *dhcp_type_p =
 435                             get_dhcp_type(tvb_get_guint8(tvb, voff+2));
 436                         break;
 437
 438                 case 60:
 439                         *vendor_class_id_p =
 440                             tvb_get_ptr(tvb, voff+2, consumed-2);
 441                         break;
 442                 }
 443
 444                 /*
 445                  * We don't do anything else here.
 446                  */
 447                 return consumed;
 448         }
 449
 450         /*
 451          * This is the second pass - if there's a protocol tree to be
 452          * built, we put stuff into it, otherwise we just return.
 453          */
 454         if (bp_tree == NULL) {
 455                 /* Don't put anything in the protocol tree. */
 456                 return consumed;
 457         }
 458
 459         text = opt[code].text;
 460         /* Special cases */
 461         switch (code) {
 462
 463         case 21:        /* Policy Filter */
 464                 if (vlen == 8) {
 465                         /* one IP address pair */
 466                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 467                                 "Option %d: %s = %s/%s", code, text,
 468                                 ip_to_str(tvb_get_ptr(tvb, voff+2, 4)),
 469                                 ip_to_str(tvb_get_ptr(tvb, voff+6, 4)));
 470                 } else {
 471                         /* > 1 IP address pair. Let's make a sub-tree */
 472                         vti = proto_tree_add_text(bp_tree, tvb, voff,
 473                                 consumed, "Option %d: %s", code, text);
 474                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 475                         for (i = voff + 2; i < voff + consumed; i += 8) {
 476                                 proto_tree_add_text(v_tree, tvb, i, 8, "IP Address/Mask: %s/%s",
 477                                         ip_to_str(tvb_get_ptr(tvb, i, 4)),
 478                                         ip_to_str(tvb_get_ptr(tvb, i+4, 4)));
 479                         }
 480                 }
 481                 break;
 482
 483         case 33:        /* Static Route */
 484                 if (vlen == 8) {
 485                         /* one IP address pair */
 486                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 487                                 "Option %d: %s = %s/%s", code, text,
 488                                 ip_to_str(tvb_get_ptr(tvb, voff+2, 4)),
 489                                 ip_to_str(tvb_get_ptr(tvb, voff+6, 4)));
 490                 } else {
 491                         /* > 1 IP address pair. Let's make a sub-tree */
 492                         vti = proto_tree_add_text(bp_tree, tvb, voff,
 493                                 consumed, "Option %d: %s", code, text);
 494                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 495                         for (i = voff + 2; i < voff + consumed; i += 8) {
 496                                 proto_tree_add_text(v_tree, tvb, i, 8,
 497                                         "Destination IP Address/Router: %s/%s",
 498                                         ip_to_str(tvb_get_ptr(tvb, i, 4)),
 499                                         ip_to_str(tvb_get_ptr(tvb, i+4, 4)));
 500                         }
 501                 }
 502                 break;
 503
 504         case 43:        /* Vendor-Specific Info */
 505                 /* PXE protocol 2.1 as described in the intel specs */
 506                 if (*vendor_class_id_p != NULL &&
 507                     strncmp(*vendor_class_id_p, "PXEClient", strlen("PXEClient")) == 0) {
 508                         vti = proto_tree_add_text(bp_tree, tvb, voff,
 509                                 consumed, "Option %d: %s (PXEClient)", code, text);
 510                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 511
 512                         optp = voff+2;
 513                         while (optp < voff+consumed) {
 514                                 optp = dissect_vendor_pxeclient_suboption(v_tree,
 515                                         tvb, optp);
 516                         }
 517                 } else {
 518                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 519                                 "Option %d: %s (%d bytes)", code, text, vlen);
 520                 }
 521                 break;
 522
 523         case 46:        /* NetBIOS-over-TCP/IP Node Type */
 524                 byte = tvb_get_guint8(tvb, voff+2);
 525                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 526                                 "Option %d: %s = %s", code, text,
 527                                 val_to_str(byte, nbnt_vals,
 528                                     "Unknown (0x%02x)"));
 529                 break;
 530
 531         case 53:        /* DHCP Message Type */
 532                 proto_tree_add_text(bp_tree, tvb, voff, 3, "Option %d: %s = DHCP %s",
 533                         code, text, get_dhcp_type(tvb_get_guint8(tvb, voff+2)));
 534                 break;
 535
 536         case 55:        /* Parameter Request List */
 537                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 538                         vlen + 2, "Option %d: %s", code, text);
 539                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 540                 for (i = 0; i < vlen; i++) {
 541                         byte = tvb_get_guint8(tvb, voff+2+i);
 542                         if (byte < NUM_OPT_INFOS) {
 543                                 proto_tree_add_text(v_tree, tvb, voff+2+i, 1, "%d = %s",
 544                                                 byte, opt[byte].text);
 545                         } else {
 546                                 proto_tree_add_text(vti, tvb, voff+2+i, 1,
 547                                         "Unknown Option Code: %d", byte);
 548                         }
 549                 }
 550                 break;
 551
 552         case 60:        /* Vendor class identifier */
 553                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 554                         "Option %d: %s = \"%.*s\"", code, text, vlen,
 555                         tvb_get_ptr(tvb, voff+2, consumed-2));
 556                 break;
 557
 558         case 61:        /* Client Identifier */
 559                 /* We *MAY* use hwtype/hwaddr. If we have 7 bytes, I'll
 560                    guess that the first is the hwtype, and the last 6
 561                    are the hw addr */
 562                 if (vlen == 7) {
 563                         guint8 htype;
 564
 565                         vti = proto_tree_add_text(bp_tree, tvb, voff,
 566                                 consumed, "Option %d: %s", code, text);
 567                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 568                         htype = tvb_get_guint8(tvb, voff+2);
 569                         proto_tree_add_text(v_tree, tvb, voff+2, 1,
 570                                 "Hardware type: %s",
 571                                 arphrdtype_to_str(htype,
 572                                         "Unknown (0x%02x)"));
 573                         proto_tree_add_text(v_tree, tvb, voff+3, 6,
 574                                 "Client hardware address: %s",
 575                                 arphrdaddr_to_str(tvb_get_ptr(tvb, voff+3, 6),
 576                                         6, htype));
 577                 } else {
 578                         /* otherwise, it's opaque data */
 579                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 580                                 "Option %d: %s (%d bytes)", code, text, vlen);
 581                 }
 582                 break;
 583
 584         case 63:        /* NetWare/IP options */
 585                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 586                     consumed, "Option %d: %s", code, text);
 587                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 588
 589                 optp = voff+2;
 590                 while (optp < voff+consumed)
 591                         optp = dissect_netware_ip_suboption(v_tree, tvb, optp);
 592                 break;
 593
 594         case 82:        /* Relay Agent Information Option */
 595                 vti = proto_tree_add_text(bp_tree, tvb, voff, consumed,
 596                                           "Option %d: %s (%d bytes)",
 597                                           code, text, vlen);
 598                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 599                 optp = voff+2;
 600                 while (optp < voff+consumed) {
 601                         optp = bootp_dhcp_decode_agent_info(v_tree, tvb, optp);
 602                 }
 603                 break;
 604
 605         case 90:        /* DHCP Authentication */
 606         case 210:       /* Was this used for authentication at one time? */
 607                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 608                         vlen + 2, "Option %d: %s", code, text);
 609                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 610
 611                 protocol = tvb_get_guint8(tvb, voff+2);
 612                 proto_tree_add_text(v_tree, tvb, voff+2, 1, "Protocol: %s (%u)",
 613                                     val_to_str(protocol, authen_protocol_vals, "Unknown"),
 614                                     protocol);
 615
 616                 algorithm = tvb_get_guint8(tvb, voff+3);
 617                 switch (protocol) {
 618
 619                 case AUTHEN_PROTO_DELAYED_AUTHEN:
 620                         proto_tree_add_text(v_tree, tvb, voff+3, 1,
 621                                     "Algorithm: %s (%u)",
 622                                     val_to_str(algorithm, authen_da_algo_vals, "Unknown"),
 623                                     algorithm);
 624                         break;
 625
 626                 default:
 627                         proto_tree_add_text(v_tree, tvb, voff+3, 1,
 628                                     "Algorithm: %u", algorithm);
 629                         break;
 630                 }
 631
 632                 rdm = tvb_get_guint8(tvb, voff+4);
 633                 proto_tree_add_text(v_tree, tvb, voff+4, 1,
 634                                     "Replay Detection Method: %s (%u)",
 635                                     val_to_str(rdm, authen_rdm_vals, "Unknown"),
 636                                     rdm);
 637
 638                 switch (rdm) {
 639
 640                 case AUTHEN_RDM_MONOTONIC_COUNTER:
 641                         proto_tree_add_text(v_tree, tvb, voff+5, 8,
 642                                     "Replay Detection Value: %s",
 643                                     u64toh(tvb_get_ptr(tvb, voff+5, 8)));
 644                         break;
 645
 646                 default:
 647                         proto_tree_add_text(v_tree, tvb, voff+5, 8,
 648                                     "Replay Detection Value: %s",
 649                                     tvb_bytes_to_str(tvb, voff+5, 8));
 650                         break;
 651                 }
 652
 653                 switch (protocol) {
 654
 655                 case AUTHEN_PROTO_DELAYED_AUTHEN:
 656                         switch (algorithm) {
 657
 658                         case AUTHEN_DELAYED_ALGO_HMAC_MD5:
 659                                 proto_tree_add_text(v_tree, tvb, voff+13, 4,
 660                                         "Secret ID: 0x%08x",
 661                                         tvb_get_ntohl(tvb, voff+13));
 662                                 proto_tree_add_text(v_tree, tvb, voff+17, 16,
 663                                         "HMAC MD5 Hash: %s",
 664                                         tvb_bytes_to_str(tvb, voff+17, 16));
 665                                 break;
 666
 667                         default:
 668                                 proto_tree_add_text(v_tree, tvb, voff+13, vlen-11,
 669                                         "Authentication Information: %s",
 670                                         tvb_bytes_to_str(tvb, voff+17, vlen-11));
 671                                 break;
 672                         }
 673                         break;
 674
 675                 default:
 676                         proto_tree_add_text(v_tree, tvb, voff+13, vlen-11,
 677                                 "Authentication Information: %s",
 678                                 tvb_bytes_to_str(tvb, voff+17, vlen-11));
 679                         break;
 680                 }
 681                 break;
 682
 683         default:        /* not special */
 684                 break;
 685         }
 686
 687         /* Normal cases */
 688         if (code < NUM_OPT_INFOS) {
 689                 text = opt[code].text;
 690                 ftype = opt[code].ftype;
 691
 692                 switch (ftype) {
 693
 694                 case special:
 695                         return consumed;
 696
 697                 case ipv4:
 698                         if (vlen == 4) {
 699                                 /* one IP address */
 700                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 701                                         "Option %d: %s = %s", code, text,
 702                                         ip_to_str(tvb_get_ptr(tvb, voff+2, 4)));
 703                         } else {
 704                                 /* > 1 IP addresses. Let's make a sub-tree */
 705                                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 706                                         consumed, "Option %d: %s", code, text);
 707                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 708                                 for (i = voff + 2; i < voff + consumed; i += 4) {
 709                                         proto_tree_add_text(v_tree, tvb, i, 4, "IP Address: %s",
 710                                                 ip_to_str(tvb_get_ptr(tvb, i, 4)));
 711                                 }
 712                         }
 713                         break;
 714
 715                 case string:
 716                         /* Fix for non null-terminated string supplied by
 717                          * John Lines <John.Lines@aeat.co.uk>
 718                          */
 719                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 720                                         "Option %d: %s = \"%.*s\"", code, text, vlen,
 721                                         tvb_get_ptr(tvb, voff+2, consumed-2));
 722                         break;
 723
 724                 case opaque:
 725                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 726                                         "Option %d: %s (%d bytes)",
 727                                         code, text, vlen);
 728                         break;
 729
 730                 case val_u_short:
 731                         if (vlen == 2) {
 732                                 /* one u_short */
 733                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 734                                                 "Option %d: %s = %d", code, text,
 735                                                 tvb_get_ntohs(tvb, voff+2));
 736                         } else {
 737                                 /* > 1 u_short */
 738                                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 739                                         consumed, "Option %d: %s", code, text);
 740                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 741                                 for (i = voff + 2; i < voff + consumed; i += 2) {
 742                                         proto_tree_add_text(v_tree, tvb, i, 4, "Value: %d",
 743                                                 tvb_get_ntohs(tvb, i));
 744                                 }
 745                         }
 746                         break;
 747
 748                 case val_u_long:
 749                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 750                                         "Option %d: %s = %d", code, text,
 751                                         tvb_get_ntohl(tvb, voff+2));
 752                         break;
 753
 754                 case val_u_byte:
 755                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 756                                         "Option %d: %s = %d", code, text,
 757                                         tvb_get_guint8(tvb, voff+2));
 758                         break;
 759
 760                 case toggle:
 761                         i = tvb_get_guint8(tvb, voff+2);
 762                         if (i != 0 && i != 1) {
 763                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 764                                                 "Option %d: %s = Invalid Value %d", code, text,
 765                                                 i);
 766                         } else {
 767                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 768                                                 "Option %d: %s = %s", code, text,
 769                                                 i == 0 ? "Disabled" : "Enabled");
 770                         }
 771                         break;
 772
 773                 case yes_no:
 774                         i = tvb_get_guint8(tvb, voff+2);
 775                         if (i != 0 && i != 1) {
 776                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 777                                                 "Option %d: %s = Invalid Value %d", code, text,
 778                                                 i);
 779                         } else {
 780                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 781                                                 "Option %d: %s = %s", code, text,
 782                                                 i == 0 ? "No" : "Yes");
 783                         }
 784                         break;
 785
 786                 case time_in_secs:
 787                         time_secs = tvb_get_ntohl(tvb, voff+2);
 788                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 789                                 "Option %d: %s = %s", code, text,
 790                                 ((time_secs == 0xffffffff) ?
 791                                     "infinity" :
 792                                     time_secs_to_str(time_secs)));
 793                         break;
 794
 795                 default:
 796                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 797                                         "Option %d: %s (%d bytes)", code, text, vlen);
 798                 }
 799         } else {
 800                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 801                                 "Unknown Option Code: %d (%d bytes)", code, vlen);
 802         }
 803
 804         return consumed;
 805 }
 806
 807 static int
 808 bootp_dhcp_decode_agent_info(proto_tree *v_tree, tvbuff_t *tvb, int optp)
 809 {
 810         guint8 subopt;
 811         guint8 subopt_len;
 812
 813         subopt = tvb_get_guint8(tvb, optp);
 814         subopt_len = tvb_get_guint8(tvb, optp+1);
 815         switch (subopt) {
 816         case 1:
 817                 proto_tree_add_text(v_tree, tvb, optp, subopt_len + 2,
 818                                     "Agent Circuit ID (%d bytes)", subopt_len);
 819                 break;
 820         case 2:
 821                 proto_tree_add_text(v_tree, tvb, optp, subopt_len + 2,
 822                                     "Agent Remote ID (%d bytes)", subopt_len);
 823                 break;
 824         default:
 825                 proto_tree_add_text(v_tree, tvb, optp, subopt_len + 2,
 826                                     "Unknown agent option: %d", subopt);
 827                 break;
 828         }
 829         optp += (subopt_len + 2);
 830         return optp;
 831 }
 832
 833 static int
 834 dissect_vendor_pxeclient_suboption(proto_tree *v_tree, tvbuff_t *tvb, int optp)
 835 {
 836         guint8 subopt;
 837         guint8 subopt_len;
 838         int slask;
 839         proto_tree *o43pxeclient_v_tree;
 840         proto_item *vti;
 841
 842         struct o43pxeclient_opt_info {
 843                 char    *text;
 844                 enum field_type ft;
 845         };
 846
 847         static struct o43pxeclient_opt_info o43pxeclient_opt[]= {
 848                 /* 0 */ {"nop", special},       /* dummy */
 849                 /* 1 */ {"PXE mtftp IP", ipv4},
 850                 /* 2 */ {"PXE mtftp client port", val_u_le_short},
 851                 /* 3 */ {"PXE mtftp server port",val_u_le_short},
 852                 /* 4 */ {"PXE mtftp timeout", val_u_byte},
 853                 /* 5 */ {"PXE mtftp delay", val_u_byte},
 854                 /* 6 */ {"PXE discovery control", val_u_byte},
 855                         /*
 856                          * Correct: b0 (lsb): disable broadcast discovery
 857                          *      b1: disable multicast discovery
 858                          *      b2: only use/accept servers in boot servers
 859                          *      b3: download bootfile without prompt/menu/disc
 860                          */
 861                 /* 7 */ {"PXE multicast address", ipv4},
 862                 /* 8 */ {"PXE boot servers", special},
 863                 /* 9 */ {"PXE boot menu", special},
 864                 /* 10 */ {"PXE menu prompt", special},
 865                 /* 11 */ {"PXE multicast address alloc", special},
 866                 /* 12 */ {"PXE credential types", special},
 867                 /* 71 {"PXE boot item", special} */
 868                 /* 255 {"PXE end options", special} */
 869         };
 870 #define NUM_O43PXECLIENT_SUBOPTS (12)
 871
 872         subopt = tvb_get_guint8(tvb, optp);
 873
 874         if (subopt == 0 ) {
 875                 proto_tree_add_text(v_tree, tvb, optp, 1, "Padding");
 876                 return (optp+1);
 877         } else if (subopt == 255) {     /* End Option */
 878                 proto_tree_add_text(v_tree, tvb, optp, 1, "End PXEClient option");
 879                 /* Make sure we skip any junk left this option */
 880                 return (optp+255);
 881         }
 882
 883         subopt_len = tvb_get_guint8(tvb, optp+1);
 884
 885         if ( subopt == 71 ) {   /* 71 {"PXE boot item", special} */
 886                 /* case special */
 887                 /* I may need to decode that properly one day */
 888                 proto_tree_add_text(v_tree, tvb, optp, subopt_len+2,
 889                         "Suboption %d: %s (%d byte%s)" ,
 890                         subopt, "PXE boot item",
 891                         subopt_len, (subopt_len != 1)?"s":"");
 892         } else if ( (subopt < 1 ) || (subopt > NUM_O43PXECLIENT_SUBOPTS) ) {
 893                 proto_tree_add_text(v_tree, tvb, optp, subopt_len+2,
 894                         "Unknown suboption %d (%d byte%s)", subopt, subopt_len,
 895                         (subopt_len != 1)?"s":"");
 896         } else {
 897                 switch (o43pxeclient_opt[subopt].ft) {
 898
 899 /* XXX          case string:
 900                         proto_tree_add_text(v_tree, tvb, optp, subopt_len+2,
 901                                 "Suboption %d: %s", subopt, o43pxeclient_opt[subopt].text);
 902                         break;
 903    XXX */
 904                 case special:
 905                         /* I may need to decode that properly one day */
 906                         proto_tree_add_text(v_tree, tvb, optp, subopt_len+2,
 907                                 "Suboption %d: %s (%d byte%s)" ,
 908                                 subopt, o43pxeclient_opt[subopt].text,
 909                                 subopt_len, (subopt_len != 1)?"s":"");
 910                         break;
 911
 912                 case val_u_le_short:
 913                         proto_tree_add_text(v_tree, tvb, optp, 4, "Suboption %d: %s = %u",
 914                             subopt, o43pxeclient_opt[subopt].text,
 915                             tvb_get_letohs(tvb, optp+2));
 916                         break;
 917
 918                 case val_u_byte:
 919                         proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s = %u",
 920                             subopt, o43pxeclient_opt[subopt].text,
 921                             tvb_get_guint8(tvb, optp+2));
 922                         break;
 923
 924                 case ipv4:
 925                         if (subopt_len == 4) {
 926                                 /* one IP address */
 927                                 proto_tree_add_text(v_tree, tvb, optp, 6,
 928                                     "Suboption %d : %s = %s",
 929                                     subopt, o43pxeclient_opt[subopt].text,
 930                                     ip_to_str(tvb_get_ptr(tvb, optp+2, 4)));
 931                         } else {
 932                                 /* > 1 IP addresses. Let's make a sub-tree */
 933                                 vti = proto_tree_add_text(v_tree, tvb, optp,
 934                                     subopt_len+2, "Suboption %d: %s",
 935                                     subopt, o43pxeclient_opt[subopt].text);
 936                                 o43pxeclient_v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 937                                 for (slask = optp + 2 ; slask < optp+subopt_len; slask += 4) {
 938                                         proto_tree_add_text(o43pxeclient_v_tree, tvb, slask, 4, "IP Address: %s",
 939                                             ip_to_str(tvb_get_ptr(tvb, slask, 4)));
 940                                 }
 941                         }
 942                         break;
 943                 default:
 944                         proto_tree_add_text(v_tree, tvb, optp, subopt_len+2,"ERROR, please report: Unknown subopt type handler %d", subopt);
 945                         break;
 946                 }
 947         }
 948         optp += (subopt_len + 2);
 949         return optp;
 950 }
 951
 952 static int
 953 dissect_netware_ip_suboption(proto_tree *v_tree, tvbuff_t *tvb, int optp)
 954 {
 955         guint8 subopt;
 956         guint8 subopt_len;
 957         int slask;
 958         proto_tree *o63_v_tree;
 959         proto_item *vti;
 960
 961         struct o63_opt_info {
 962                 char    *truet;
 963                 char    *falset;
 964                 enum field_type ft;
 965         };
 966
 967         static struct o63_opt_info o63_opt[]= {
 968                 /* 0 */ {"","",none},
 969                 /* 1 */ {"NWIP does not exist on subnet","",string},
 970                 /* 2 */ {"NWIP exist in options area","",string},
 971                 /* 3 */ {"NWIP exists in sname/file","",string},
 972                 /* 4 */ {"NWIP exists, but too big","",string},
 973                 /* 5 */ {"Broadcast for nearest Netware server","Do NOT Broadcast for nearest Netware server",yes_no},
 974                 /* 6 */ {"Preferred DSS server","",ipv4},
 975                 /* 7 */ {"Nearest NWIP server","",ipv4},
 976                 /* 8 */ {"Autoretries","",val_u_short},
 977                 /* 9 */ {"Autoretry delay, secs ","",val_u_short},
 978                 /* 10*/ {"Support NetWare/IP v1.1","Do NOT support NetWare/IP v1.1",yes_no},
 979                 /* 11*/ {"Primary DSS ", "" , special}
 980         };
 981
 982         subopt = tvb_get_guint8(tvb, optp);
 983         if (subopt > NUM_O63_SUBOPTS) {
 984                 proto_tree_add_text(v_tree, tvb,optp,1,"Unknown suboption %d", subopt);
 985                 optp++;
 986         } else {
 987                 switch (o63_opt[subopt].ft) {
 988
 989                 case string:
 990                         proto_tree_add_text(v_tree, tvb, optp, 2, "Suboption %d: %s", subopt, o63_opt[subopt].truet);
 991                         optp+=2;
 992                         break;
 993
 994                 case yes_no:
 995                         if (tvb_get_guint8(tvb, optp+2)==1) {
 996                                 proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s", subopt, o63_opt[subopt].truet);
 997                         } else {
 998                                 proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s" , subopt, o63_opt[subopt].falset);
 999                         }
1000                         optp+=3;
1001                         break;
1002
1003                 case special:
1004                         proto_tree_add_text(v_tree, tvb, optp, 6,
1005                             "Suboption %d: %s = %s" ,
1006                             subopt, o63_opt[subopt].truet,
1007                             ip_to_str(tvb_get_ptr(tvb, optp+2, 4)));
1008                         optp=optp+6;
1009                         break;
1010
1011                 case val_u_short:
1012                         proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s = %u",
1013                             subopt, o63_opt[subopt].truet,
1014                             tvb_get_guint8(tvb, optp+2));       /* XXX - 1 byte? */
1015                         optp+=3;
1016                         break;
1017
1018                 case ipv4:
1019                         subopt_len = tvb_get_guint8(tvb, optp+1);
1020                         if (subopt_len == 4) {
1021                                 /* one IP address */
1022                                 proto_tree_add_text(v_tree, tvb, optp, 6,
1023                                     "Suboption %d : %s = %s",
1024                                     subopt, o63_opt[subopt].truet,
1025                                     ip_to_str(tvb_get_ptr(tvb, optp+2, 4)));
1026                                 optp=optp+6;
1027                         } else {
1028                                 /* > 1 IP addresses. Let's make a sub-tree */
1029                                 vti = proto_tree_add_text(v_tree, tvb, optp,
1030                                     subopt_len+2, "Suboption %d: %s",
1031                                     subopt, o63_opt[subopt].truet);
1032                                 o63_v_tree = proto_item_add_subtree(vti, ett_bootp_option);
1033                                 for (slask = optp + 2 ; slask < optp+subopt_len; slask += 4) {
1034                                         proto_tree_add_text(o63_v_tree, tvb, slask, 4, "IP Address: %s",
1035                                             ip_to_str(tvb_get_ptr(tvb, slask, 4)));
1036                                 }
1037                                 optp=slask;
1038                         }
1039                         break;
1040                 default:
1041                         proto_tree_add_text(v_tree, tvb,optp,1,"Unknown suboption %d", subopt);
1042                         optp++;
1043                         break;
1044                 }
1045         }
1046         return optp;
1047 }
1048
1049 #define BOOTREQUEST     1
1050 #define BOOTREPLY       2
1051
1052 static const value_string op_vals[] = {
1053         { BOOTREQUEST,  "Boot Request" },
1054         { BOOTREPLY,    "Boot Reply" },
1055         { 0,            NULL }
1056 };
1057
1058 static void
1059 dissect_bootp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1060 {
1061         proto_tree      *bp_tree = NULL;
1062         proto_item      *ti;
1063         guint8          op;
1064         guint8          htype, hlen;
1065         const guint8    *haddr;
1066         int             voff, eoff, tmpvoff; /* vendor offset, end offset */
1067         guint32         ip_addr;
1068         const char      *dhcp_type = NULL;
1069         const guint8    *vendor_class_id = NULL;
1070
1071         if (check_col(pinfo->fd, COL_PROTOCOL))
1072                 col_set_str(pinfo->fd, COL_PROTOCOL, "BOOTP");
1073         if (check_col(pinfo->fd, COL_INFO)) {
1074                 /*
1075                  * In case we throw an exception fetching the opcode, etc.
1076                  */
1077                 col_clear(pinfo->fd, COL_INFO);
1078         }
1079
1080         op = tvb_get_guint8(tvb, 0);
1081         htype = tvb_get_guint8(tvb, 1);
1082         hlen = tvb_get_guint8(tvb, 2);
1083         if (check_col(pinfo->fd, COL_INFO)) {
1084                 switch (op) {
1085
1086                 case BOOTREQUEST:
1087                         col_add_fstr(pinfo->fd, COL_INFO, "Boot Request from %s",
1088                                 arphrdaddr_to_str(tvb_get_ptr(tvb, 28, hlen),
1089                                         hlen, htype));
1090                         break;
1091
1092                 case BOOTREPLY:
1093                         col_set_str(pinfo->fd, COL_INFO, "Boot Reply");
1094                         break;
1095
1096                 default:
1097                         col_add_fstr(pinfo->fd, COL_INFO, "Unknown BOOTP message type (%u)",
1098                             op);
1099                         break;
1100                 }
1101         }
1102
1103         if (tree) {
1104                 ti = proto_tree_add_item(tree, proto_bootp, tvb, 0,
1105                     tvb_length(tvb), FALSE);
1106                 bp_tree = proto_item_add_subtree(ti, ett_bootp);
1107
1108                 proto_tree_add_uint(bp_tree, hf_bootp_type, tvb,
1109                                            0, 1,
1110                                            op);
1111                 proto_tree_add_uint_format(bp_tree, hf_bootp_hw_type, tvb,
1112                                            1, 1,
1113                                            htype,
1114                                            "Hardware type: %s",
1115                                            arphrdtype_to_str(htype,
1116                                                              "Unknown (0x%02x)"));
1117                 proto_tree_add_uint(bp_tree, hf_bootp_hw_len, tvb,
1118                                     2, 1, hlen);
1119                 proto_tree_add_item(bp_tree, hf_bootp_hops, tvb,
1120                                     3, 1, FALSE);
1121                 proto_tree_add_item(bp_tree, hf_bootp_id, tvb,
1122                                     4, 4, FALSE);
1123                 proto_tree_add_item(bp_tree, hf_bootp_secs, tvb,
1124                                     8, 2, FALSE);
1125                 proto_tree_add_uint(bp_tree, hf_bootp_flag, tvb,
1126                                     10, 2, tvb_get_ntohs(tvb, 10) & 0x8000);
1127
1128                 proto_tree_add_item(bp_tree, hf_bootp_ip_client, tvb,
1129                                     12, 4, FALSE);
1130                 proto_tree_add_item(bp_tree, hf_bootp_ip_your, tvb,
1131                                     16, 4, FALSE);
1132                 proto_tree_add_item(bp_tree, hf_bootp_ip_server, tvb,
1133                                     20, 4, FALSE);
1134                 proto_tree_add_item(bp_tree, hf_bootp_ip_relay, tvb,
1135                                     24, 4, FALSE);
1136
1137                 if (hlen > 0) {
1138                         haddr = tvb_get_ptr(tvb, 28, hlen);
1139                         proto_tree_add_bytes_format(bp_tree, hf_bootp_hw_addr, tvb,
1140                                                    28, hlen,
1141                                                    haddr,
1142                                                    "Client hardware address: %s",
1143                                                    arphrdaddr_to_str(haddr,
1144                                                                      hlen,
1145                                                                      htype));
1146                 }
1147                 else {
1148                         proto_tree_add_text(bp_tree,  tvb,
1149                                                    28, 0, "Client address not given");
1150                 }
1151
1152                 /* The server host name is optional */
1153                 if (tvb_get_guint8(tvb, 44) != '\0') {
1154                         proto_tree_add_item(bp_tree, hf_bootp_server, tvb,
1155                                                    44, 64, FALSE);
1156                 }
1157                 else {
1158                         proto_tree_add_string_format(bp_tree, hf_bootp_server, tvb,
1159                                                    44, 64,
1160                                                    tvb_get_ptr(tvb, 44, 1),
1161                                                    "Server host name not given");
1162                 }
1163
1164                 /* Boot file */
1165                 if (tvb_get_guint8(tvb, 108) != '\0') {
1166                         proto_tree_add_item(bp_tree, hf_bootp_file, tvb,
1167                                                    108, 128, FALSE);
1168                 }
1169                 else {
1170                         proto_tree_add_string_format(bp_tree, hf_bootp_file, tvb,
1171                                                    108, 128,
1172                                                    tvb_get_ptr(tvb, 108, 1),
1173                                                    "Boot file name not given");
1174                 }
1175
1176                 tvb_memcpy(tvb, (void *)&ip_addr, 236, sizeof(ip_addr));
1177                 if (tvb_get_ntohl(tvb, 236) == 0x63825363) {
1178                         proto_tree_add_ipv4_format(bp_tree, hf_bootp_cookie, tvb,
1179                                             236, 4, ip_addr,
1180                                             "Magic cookie: (OK)");
1181                 }
1182                 else {
1183                         proto_tree_add_ipv4(bp_tree, hf_bootp_cookie, tvb,
1184                                             236, 4, ip_addr);
1185                 }
1186         }
1187
1188         voff = 240;
1189         eoff = tvb_reported_length(tvb);
1190
1191         /*
1192          * In the first pass, we just look for the DHCP message type
1193          * and Vendor class identifier options.
1194          */
1195         tmpvoff = voff;
1196         while (tmpvoff < eoff) {
1197                 tmpvoff += bootp_option(tvb, 0, tmpvoff, eoff, TRUE,
1198                     &dhcp_type, &vendor_class_id);
1199         }
1200
1201         /*
1202          * If there was a DHCP message type option, flag this packet
1203          * as DHCP.
1204          */
1205         if (dhcp_type != NULL) {
1206                 /*
1207                  * Yes, this is a DHCP packet, and "dhcp_type" is the
1208                  * packet type.
1209                  */
1210                 if (check_col(pinfo->fd, COL_PROTOCOL))
1211                         col_set_str(pinfo->fd, COL_PROTOCOL, "DHCP");
1212                 if (check_col(pinfo->fd, COL_INFO))
1213                         col_add_fstr(pinfo->fd, COL_INFO, "DHCP %-8s - Transaction ID 0x%x",
1214                             dhcp_type, tvb_get_ntohl(tvb, 4));
1215                 if (tree)
1216                         proto_tree_add_boolean_hidden(bp_tree, hf_bootp_dhcp,
1217                             tvb, 0, 0, 1);
1218         }
1219
1220         /*
1221          * If we're not building the protocol tree, we don't need to
1222          * make a second pass.
1223          */
1224         if (tree == NULL)
1225                 return;
1226
1227         /*
1228          * OK, now build the protocol tree.
1229          */
1230         while (voff < eoff) {
1231                 voff += bootp_option(tvb, bp_tree, voff, eoff, FALSE,
1232                     &dhcp_type, &vendor_class_id);
1233         }
1234 }
1235
1236 void
1237 proto_register_bootp(void)
1238 {
1239   static hf_register_info hf[] = {
1240     { &hf_bootp_dhcp,
1241       { "Frame is DHCP",                "bootp.dhcp",    FT_BOOLEAN,
1242         BASE_NONE,                      NULL,            0x0,
1243         "", HFILL }},
1244
1245     { &hf_bootp_type,
1246       { "Message type",                 "bootp.type",    FT_UINT8,
1247          BASE_DEC,                      VALS(op_vals),   0x0,
1248         "", HFILL }},
1249
1250     { &hf_bootp_hw_type,
1251       { "Hardware type",                "bootp.hw.type", FT_UINT8,
1252         BASE_HEX,                       NULL,            0x0,
1253         "", HFILL }},
1254
1255     { &hf_bootp_hw_len,
1256       { "Hardware address length",      "bootp.hw.len",  FT_UINT8,
1257         BASE_DEC,                       NULL,            0x0,
1258         "", HFILL }},
1259
1260     { &hf_bootp_hops,
1261       { "Hops",                         "bootp.hops",    FT_UINT8,
1262         BASE_DEC,                       NULL,            0x0,
1263         "", HFILL }},
1264
1265     { &hf_bootp_id,
1266       { "Transaction ID",               "bootp.id",      FT_UINT32,
1267         BASE_HEX,                        NULL,           0x0,
1268         "", HFILL }},
1269
1270     { &hf_bootp_secs,
1271       { "Seconds elapsed",              "bootp.secs",    FT_UINT16,
1272         BASE_DEC,                        NULL,           0x0,
1273         "", HFILL }},
1274
1275     { &hf_bootp_flag,
1276       { "Broadcast flag",               "bootp.flag",    FT_UINT16,
1277         BASE_HEX,                       NULL,            0x0,
1278         "", HFILL }},
1279
1280     { &hf_bootp_ip_client,
1281       { "Client IP address",            "bootp.ip.client",FT_IPv4,
1282         BASE_NONE,                      NULL,             0x0,
1283         "", HFILL }},
1284
1285     { &hf_bootp_ip_your,
1286       { "Your (client) IP address",     "bootp.ip.your",  FT_IPv4,
1287         BASE_NONE,                      NULL,             0x0,
1288         "", HFILL }},
1289
1290     { &hf_bootp_ip_server,
1291       { "Next server IP address",       "bootp.ip.server",FT_IPv4,
1292         BASE_NONE,                      NULL,             0x0,
1293         "", HFILL }},
1294
1295     { &hf_bootp_ip_relay,
1296       { "Relay agent IP address",       "bootp.ip.relay", FT_IPv4,
1297         BASE_NONE,                      NULL,             0x0,
1298         "", HFILL }},
1299
1300     { &hf_bootp_hw_addr,
1301       { "Client hardware address",      "bootp.hw.addr", FT_BYTES,
1302         BASE_NONE,                      NULL,            0x0,
1303         "", HFILL }},
1304
1305     { &hf_bootp_server,
1306       { "Server host name",             "bootp.server",  FT_STRING,
1307         BASE_NONE,                      NULL,            0x0,
1308         "", HFILL }},
1309
1310     { &hf_bootp_file,
1311       { "Boot file name",               "bootp.file",    FT_STRING,
1312         BASE_NONE,                      NULL,            0x0,
1313         "", HFILL }},
1314
1315     { &hf_bootp_cookie,
1316       { "Magic cookie",                 "bootp.cookie",  FT_IPv4,
1317          BASE_NONE,                     NULL,            0x0,
1318         "", HFILL }},
1319   };
1320   static gint *ett[] = {
1321     &ett_bootp,
1322     &ett_bootp_option,
1323   };
1324
1325   proto_bootp = proto_register_protocol("Bootstrap Protocol", "BOOTP/DHCP",
1326                                         "bootp");
1327   proto_register_field_array(proto_bootp, hf, array_length(hf));
1328   proto_register_subtree_array(ett, array_length(ett));
1329 }
1330
1331 void
1332 proto_reg_handoff_bootp(void)
1333 {
1334   dissector_handle_t bootp_handle;
1335
1336   bootp_handle = create_dissector_handle(dissect_bootp, proto_bootp);
1337   dissector_add("udp.port", UDP_PORT_BOOTPS, bootp_handle);
1338 }