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 1.75 2003/09/02 22:47:57 guy Exp $
   6  *
   7  * The information used comes from:
   8  * RFC  951: Bootstrap Protocol
   9  * RFC 1497: BOOTP extensions
  10  * RFC 1542: Clarifications and Extensions for the Bootstrap Protocol
  11  * RFC 2131: Dynamic Host Configuration Protocol
  12  * RFC 2132: DHCP Options and BOOTP Vendor Extensions
  13  * RFC 2489: Procedure for Defining New DHCP Options
  14  * RFC 3046: DHCP Relay Agent Information Option
  15  * RFC 3118: Authentication for DHCP Messages
  16  * RFC 3203: DHCP reconfigure extension
  17  * BOOTP and DHCP Parameters
  18  *     http://www.iana.org/assignments/bootp-dhcp-parameters
  19  *
  20  * Ethereal - Network traffic analyzer
  21  * By Gerald Combs <gerald@ethereal.com>
  22  * Copyright 1998 Gerald Combs
  23  *
  24  * This program is free software; you can redistribute it and/or
  25  * modify it under the terms of the GNU General Public License
  26  * as published by the Free Software Foundation; either version 2
  27  * of the License, or (at your option) any later version.
  28  *
  29  * This program is distributed in the hope that it will be useful,
  30  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  31  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  32  * GNU General Public License for more details.
  33  *
  34  * You should have received a copy of the GNU General Public License
  35  * along with this program; if not, write to the Free Software
  36  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  37  */
  38
  39 #ifdef HAVE_CONFIG_H
  40 # include "config.h"
  41 #endif
  42
  43 #include <string.h>
  44 #include <glib.h>
  45 #include <epan/int-64bit.h>
  46 #include <epan/packet.h>
  47 #include "packet-arp.h"
  48
  49 #include "tap.h"
  50
  51 static int bootp_dhcp_tap = -1;
  52 static int proto_bootp = -1;
  53 static int hf_bootp_type = -1;
  54 static int hf_bootp_hw_type = -1;
  55 static int hf_bootp_hw_len = -1;
  56 static int hf_bootp_hops = -1;
  57 static int hf_bootp_id = -1;
  58 static int hf_bootp_secs = -1;
  59 static int hf_bootp_flags = -1;
  60 static int hf_bootp_flags_broadcast = -1;
  61 static int hf_bootp_flags_reserved = -1;
  62 static int hf_bootp_ip_client = -1;
  63 static int hf_bootp_ip_your = -1;
  64 static int hf_bootp_ip_server = -1;
  65 static int hf_bootp_ip_relay = -1;
  66 static int hf_bootp_hw_addr = -1;
  67 static int hf_bootp_server = -1;
  68 static int hf_bootp_file = -1;
  69 static int hf_bootp_cookie = -1;
  70 static int hf_bootp_vendor = -1;
  71 static int hf_bootp_dhcp = -1;
  72
  73 static guint ett_bootp = -1;
  74 static guint ett_bootp_flags = -1;
  75 static guint ett_bootp_option = -1;
  76
  77 #define UDP_PORT_BOOTPS  67
  78 #define UDP_PORT_BOOTPC  68
  79
  80 #define BOOTP_BC        0x8000
  81 #define BOOTP_MBZ       0x7FFF
  82
  83 enum field_type { none, ipv4, string, toggle, yes_no, special, opaque,
  84         time_in_secs,
  85         val_u_byte, val_u_short, val_u_le_short, val_u_long,
  86         val_s_long };
  87
  88 struct opt_info {
  89         char    *text;
  90         enum field_type ftype;
  91 };
  92
  93 static const true_false_string flag_set_broadcast = {
  94   "Broadcast",
  95   "Unicast"
  96 };
  97
  98 #define NUM_OPT_INFOS 211
  99 #define NUM_O63_SUBOPTS 11
 100
 101 static int dissect_vendor_pxeclient_suboption(proto_tree *v_tree, tvbuff_t *tvb,
 102     int optp);
 103 static int dissect_netware_ip_suboption(proto_tree *v_tree, tvbuff_t *tvb,
 104     int optp);
 105 static int bootp_dhcp_decode_agent_info(proto_tree *v_tree, tvbuff_t *tvb,
 106     int optp);
 107
 108 static const char *
 109 get_dhcp_type(guint8 byte)
 110 {
 111         static const char       *opt53_text[] = {
 112                 "Unknown Message Type",
 113                 "Discover",
 114                 "Offer",
 115                 "Request",
 116                 "Decline",
 117                 "ACK",
 118                 "NAK",
 119                 "Release",
 120                 "Inform",
 121                 "Force Renew"
 122         };
 123         int i;
 124
 125         if (byte > 0 && byte < (sizeof opt53_text / sizeof opt53_text[0]))
 126                 i = byte;
 127         else
 128                 i = 0;
 129         return opt53_text[i];
 130 }
 131
 132 /* DHCP Authentication protocols */
 133 #define AUTHEN_PROTO_CONFIG_TOKEN       0
 134 #define AUTHEN_PROTO_DELAYED_AUTHEN     1
 135
 136 /* DHCP Authentication algorithms for delayed authentication */
 137 #define AUTHEN_DELAYED_ALGO_HMAC_MD5    1
 138
 139 /* DHCP Authentication Replay Detection Methods */
 140 #define AUTHEN_RDM_MONOTONIC_COUNTER    0x00
 141
 142 /* DHCP Option Overload (option code 52) */
 143 #define OPT_OVERLOAD_FILE               1
 144 #define OPT_OVERLOAD_SNAME              2
 145 #define OPT_OVERLOAD_BOTH               3
 146
 147 /* Server name and boot file offsets and lengths */
 148 #define SERVER_NAME_OFFSET              44
 149 #define SERVER_NAME_LEN                 64
 150 #define FILE_NAME_OFFSET                108
 151 #define FILE_NAME_LEN                   128
 152 #define VENDOR_INFO_OFFSET              236
 153
 154 /* Returns the number of bytes consumed by this option. */
 155 static int
 156 bootp_option(tvbuff_t *tvb, proto_tree *bp_tree, int voff, int eoff,
 157     gboolean first_pass, gboolean *at_end, const char **dhcp_type_p,
 158     const guint8 **vendor_class_id_p)
 159 {
 160         char                    *text;
 161         enum field_type         ftype;
 162         guchar                  code = tvb_get_guint8(tvb, voff);
 163         int                     vlen;
 164         guchar                  byte;
 165         int                     i,optp, consumed;
 166         gulong                  time_secs;
 167         proto_tree              *v_tree, *o52tree;
 168         proto_item              *vti;
 169         guint8                  protocol;
 170         guint8                  algorithm;
 171         guint8                  rdm;
 172         int                     o52voff, o52eoff;
 173         gboolean                o52at_end;
 174
 175         static const value_string nbnt_vals[] = {
 176             {0x1,   "B-node" },
 177             {0x2,   "P-node" },
 178             {0x4,   "M-node" },
 179             {0x8,   "H-node" },
 180             {0,     NULL     } };
 181
 182         static const value_string authen_protocol_vals[] = {
 183             {AUTHEN_PROTO_CONFIG_TOKEN,   "configuration token" },
 184             {AUTHEN_PROTO_DELAYED_AUTHEN, "delayed authentication" },
 185             {0,                           NULL     } };
 186
 187         static const value_string authen_da_algo_vals[] = {
 188             {AUTHEN_DELAYED_ALGO_HMAC_MD5, "HMAC_MD5" },
 189             {0,                            NULL     } };
 190
 191         static const value_string authen_rdm_vals[] = {
 192             {AUTHEN_RDM_MONOTONIC_COUNTER, "Monotonically-increasing counter" },
 193             {0,                            NULL     } };
 194
 195         static const value_string opt_overload_vals[] = {
 196             { OPT_OVERLOAD_FILE,  "Boot file name holds options",                },
 197             { OPT_OVERLOAD_SNAME, "Server host name holds options",              },
 198             { OPT_OVERLOAD_BOTH,  "Boot file and server host names hold options" },
 199             { 0,                  NULL                                           } };
 200
 201         static struct opt_info opt[] = {
 202                 /*   0 */ { "Padding",                                  none },
 203                 /*   1 */ { "Subnet Mask",                              ipv4 },
 204                 /*   2 */ { "Time Offset",                              val_s_long },
 205                 /*   3 */ { "Router",                                   ipv4 },
 206                 /*   4 */ { "Time Server",                              ipv4 },
 207                 /*   5 */ { "Name Server",                              ipv4 },
 208                 /*   6 */ { "Domain Name Server",                       ipv4 },
 209                 /*   7 */ { "Log Server",                               ipv4 },
 210                 /*   8 */ { "Cookie Server",                            ipv4 },
 211                 /*   9 */ { "LPR Server",                               ipv4 },
 212                 /*  10 */ { "Impress Server",                           ipv4 },
 213                 /*  11 */ { "Resource Location Server",                 ipv4 },
 214                 /*  12 */ { "Host Name",                                string },
 215                 /*  13 */ { "Boot File Size",                           val_u_short },
 216                 /*  14 */ { "Merit Dump File",                          string },
 217                 /*  15 */ { "Domain Name",                              string },
 218                 /*  16 */ { "Swap Server",                              ipv4 },
 219                 /*  17 */ { "Root Path",                                string },
 220                 /*  18 */ { "Extensions Path",                          string },
 221                 /*  19 */ { "IP Forwarding",                            toggle },
 222                 /*  20 */ { "Non-Local Source Routing",                 toggle },
 223                 /*  21 */ { "Policy Filter",                            special },
 224                 /*  22 */ { "Maximum Datagram Reassembly Size",         val_u_short },
 225                 /*  23 */ { "Default IP Time-to-Live",                  val_u_byte },
 226                 /*  24 */ { "Path MTU Aging Timeout",                   time_in_secs },
 227                 /*  25 */ { "Path MTU Plateau Table",                   val_u_short },
 228                 /*  26 */ { "Interface MTU",                            val_u_short },
 229                 /*  27 */ { "All Subnets are Local",                    yes_no },
 230                 /*  28 */ { "Broadcast Address",                        ipv4 },
 231                 /*  29 */ { "Perform Mask Discovery",                   toggle },
 232                 /*  30 */ { "Mask Supplier",                            yes_no },
 233                 /*  31 */ { "Perform Router Discover",                  toggle },
 234                 /*  32 */ { "Router Solicitation Address",              ipv4 },
 235                 /*  33 */ { "Static Route",                             special },
 236                 /*  34 */ { "Trailer Encapsulation",                    toggle },
 237                 /*  35 */ { "ARP Cache Timeout",                        time_in_secs },
 238                 /*  36 */ { "Ethernet Encapsulation",                   toggle },
 239                 /*  37 */ { "TCP Default TTL",                          val_u_byte },
 240                 /*  38 */ { "TCP Keepalive Interval",                   time_in_secs },
 241                 /*  39 */ { "TCP Keepalive Garbage",                    toggle },
 242                 /*  40 */ { "Network Information Service Domain",       string },
 243                 /*  41 */ { "Network Information Service Servers",      ipv4 },
 244                 /*  42 */ { "Network Time Protocol Servers",            ipv4 },
 245                 /*  43 */ { "Vendor-Specific Information",              special },
 246                 /*  44 */ { "NetBIOS over TCP/IP Name Server",          ipv4 },
 247                 /*  45 */ { "NetBIOS over TCP/IP Datagram Distribution Name Server", ipv4 },
 248                 /*  46 */ { "NetBIOS over TCP/IP Node Type",            special },
 249                 /*  47 */ { "NetBIOS over TCP/IP Scope",                string },
 250                 /*  48 */ { "X Window System Font Server",              ipv4 },
 251                 /*  49 */ { "X Window System Display Manager",          ipv4 },
 252                 /*  50 */ { "Requested IP Address",                     ipv4 },
 253                 /*  51 */ { "IP Address Lease Time",                    time_in_secs },
 254                 /*  52 */ { "Option Overload",                          special },
 255                 /*  53 */ { "DHCP Message Type",                        special },
 256                 /*  54 */ { "Server Identifier",                        ipv4 },
 257                 /*  55 */ { "Parameter Request List",                   special },
 258                 /*  56 */ { "Message",                                  string },
 259                 /*  57 */ { "Maximum DHCP Message Size",                val_u_short },
 260                 /*  58 */ { "Renewal Time Value",                       time_in_secs },
 261                 /*  59 */ { "Rebinding Time Value",                     time_in_secs },
 262                 /*  60 */ { "Vendor class identifier",                  special },
 263                 /*  61 */ { "Client identifier",                        special },
 264                 /*  62 */ { "Novell/Netware IP domain",                 string },
 265                 /*  63 */ { "Novell Options",                           special },
 266                 /*  64 */ { "Network Information Service+ Domain",      string },
 267                 /*  65 */ { "Network Information Service+ Servers",     ipv4 },
 268                 /*  66 */ { "TFTP Server Name",                         string },
 269                 /*  67 */ { "Bootfile name",                            string },
 270                 /*  68 */ { "Mobile IP Home Agent",                     ipv4 },
 271                 /*  69 */ { "SMTP Server",                              ipv4 },
 272                 /*  70 */ { "POP3 Server",                              ipv4 },
 273                 /*  71 */ { "NNTP Server",                              ipv4 },
 274                 /*  72 */ { "Default WWW Server",                       ipv4 },
 275                 /*  73 */ { "Default Finger Server",                    ipv4 },
 276                 /*  74 */ { "Default IRC Server",                       ipv4 },
 277                 /*  75 */ { "StreetTalk Server",                        ipv4 },
 278                 /*  76 */ { "StreetTalk Directory Assistance Server",   ipv4 },
 279                 /*  77 */ { "User Class Information",                   opaque },
 280                 /*  78 */ { "Directory Agent Information",              opaque },
 281                 /*  79 */ { "Service Location Agent Scope",             opaque },
 282                 /*  80 */ { "Naming Authority",                         opaque },
 283                 /*  81 */ { "Client Fully Qualified Domain Name",       opaque },
 284                 /*  82 */ { "Agent Information Option",                 special },
 285                 /*  83 */ { "Unassigned",                               opaque },
 286                 /*  84 */ { "Unassigned",                               opaque },
 287                 /*  85 */ { "Novell Directory Services Servers",        opaque },
 288                 /*  86 */ { "Novell Directory Services Tree Name",      opaque },
 289                 /*  87 */ { "Novell Directory Services Context",        opaque },
 290                 /*  88 */ { "IEEE 1003.1 POSIX Timezone",               opaque },
 291                 /*  89 */ { "Fully Qualified Domain Name",              opaque },
 292                 /*  90 */ { "Authentication",                           special },
 293                 /*  91 */ { "Vines TCP/IP Server Option",               opaque },
 294                 /*  92 */ { "Server Selection Option",                  opaque },
 295                 /*  93 */ { "Client System Architecture",               opaque },
 296                 /*  94 */ { "Client Network Device Interface",          opaque },
 297                 /*  95 */ { "Lightweight Directory Access Protocol",    opaque },
 298                 /*  96 */ { "IPv6 Transitions",                         opaque },
 299                 /*  97 */ { "UUID/GUID-based Client Identifier",        opaque },
 300                 /*  98 */ { "Open Group's User Authentication",         opaque },
 301                 /*  99 */ { "Unassigned",                               opaque },
 302                 /* 100 */ { "Printer Name",                             opaque },
 303                 /* 101 */ { "MDHCP multicast address",                  opaque },
 304                 /* 102 */ { "Removed/unassigned",                       opaque },
 305                 /* 103 */ { "Removed/unassigned",                       opaque },
 306                 /* 104 */ { "Removed/unassigned",                       opaque },
 307                 /* 105 */ { "Removed/unassigned",                       opaque },
 308                 /* 106 */ { "Removed/unassigned",                       opaque },
 309                 /* 107 */ { "Removed/unassigned",                       opaque },
 310                 /* 108 */ { "Swap Path Option",                         opaque },
 311                 /* 109 */ { "Unassigned",                               opaque },
 312                 /* 110 */ { "IPX Compability",                          opaque },
 313                 /* 111 */ { "Unassigned",                               opaque },
 314                 /* 112 */ { "NetInfo Parent Server Address",            ipv4 },
 315                 /* 113 */ { "NetInfo Parent Server Tag",                string },
 316                 /* 114 */ { "URL",                                      opaque },
 317                 /* 115 */ { "DHCP Failover Protocol",                   opaque },
 318                 /* 116 */ { "DHCP Auto-Configuration",                  opaque },
 319                 /* 117 */ { "Unassigned",                               opaque },
 320                 /* 118 */ { "Unassigned",                               opaque },
 321                 /* 119 */ { "Unassigned",                               opaque },
 322                 /* 120 */ { "Unassigned",                               opaque },
 323                 /* 121 */ { "Unassigned",                               opaque },
 324                 /* 122 */ { "Unassigned",                               opaque },
 325                 /* 123 */ { "Unassigned",                               opaque },
 326                 /* 124 */ { "Unassigned",                               opaque },
 327                 /* 125 */ { "Unassigned",                               opaque },
 328                 /* 126 */ { "Extension",                                opaque },
 329                 /* 127 */ { "Extension",                                opaque },
 330                 /* 128 */ { "Private",                                  opaque },
 331                 /* 129 */ { "Private",                                  opaque },
 332                 /* 130 */ { "Private",                                  opaque },
 333                 /* 131 */ { "Private",                                  opaque },
 334                 /* 132 */ { "Private",                                  opaque },
 335                 /* 133 */ { "Private",                                  opaque },
 336                 /* 134 */ { "Private",                                  opaque },
 337                 /* 135 */ { "Private",                                  opaque },
 338                 /* 136 */ { "Private",                                  opaque },
 339                 /* 137 */ { "Private",                                  opaque },
 340                 /* 138 */ { "Private",                                  opaque },
 341                 /* 139 */ { "Private",                                  opaque },
 342                 /* 140 */ { "Private",                                  opaque },
 343                 /* 141 */ { "Private",                                  opaque },
 344                 /* 142 */ { "Private",                                  opaque },
 345                 /* 143 */ { "Private",                                  opaque },
 346                 /* 144 */ { "Private",                                  opaque },
 347                 /* 145 */ { "Private",                                  opaque },
 348                 /* 146 */ { "Private",                                  opaque },
 349                 /* 147 */ { "Private",                                  opaque },
 350                 /* 148 */ { "Private",                                  opaque },
 351                 /* 149 */ { "Private",                                  opaque },
 352                 /* 150 */ { "Private",                                  opaque },
 353                 /* 151 */ { "Private",                                  opaque },
 354                 /* 152 */ { "Private",                                  opaque },
 355                 /* 153 */ { "Private",                                  opaque },
 356                 /* 154 */ { "Private",                                  opaque },
 357                 /* 155 */ { "Private",                                  opaque },
 358                 /* 156 */ { "Private",                                  opaque },
 359                 /* 157 */ { "Private",                                  opaque },
 360                 /* 158 */ { "Private",                                  opaque },
 361                 /* 159 */ { "Private",                                  opaque },
 362                 /* 160 */ { "Private",                                  opaque },
 363                 /* 161 */ { "Private",                                  opaque },
 364                 /* 162 */ { "Private",                                  opaque },
 365                 /* 163 */ { "Private",                                  opaque },
 366                 /* 164 */ { "Private",                                  opaque },
 367                 /* 165 */ { "Private",                                  opaque },
 368                 /* 166 */ { "Private",                                  opaque },
 369                 /* 167 */ { "Private",                                  opaque },
 370                 /* 168 */ { "Private",                                  opaque },
 371                 /* 169 */ { "Private",                                  opaque },
 372                 /* 170 */ { "Private",                                  opaque },
 373                 /* 171 */ { "Private",                                  opaque },
 374                 /* 172 */ { "Private",                                  opaque },
 375                 /* 173 */ { "Private",                                  opaque },
 376                 /* 174 */ { "Private",                                  opaque },
 377                 /* 175 */ { "Private",                                  opaque },
 378                 /* 176 */ { "Private",                                  opaque },
 379                 /* 177 */ { "Private",                                  opaque },
 380                 /* 178 */ { "Private",                                  opaque },
 381                 /* 179 */ { "Private",                                  opaque },
 382                 /* 180 */ { "Private",                                  opaque },
 383                 /* 181 */ { "Private",                                  opaque },
 384                 /* 182 */ { "Private",                                  opaque },
 385                 /* 183 */ { "Private",                                  opaque },
 386                 /* 184 */ { "Private",                                  opaque },
 387                 /* 185 */ { "Private",                                  opaque },
 388                 /* 186 */ { "Private",                                  opaque },
 389                 /* 187 */ { "Private",                                  opaque },
 390                 /* 188 */ { "Private",                                  opaque },
 391                 /* 189 */ { "Private",                                  opaque },
 392                 /* 190 */ { "Private",                                  opaque },
 393                 /* 191 */ { "Private",                                  opaque },
 394                 /* 192 */ { "Private",                                  opaque },
 395                 /* 193 */ { "Private",                                  opaque },
 396                 /* 194 */ { "Private",                                  opaque },
 397                 /* 195 */ { "Private",                                  opaque },
 398                 /* 196 */ { "Private",                                  opaque },
 399                 /* 197 */ { "Private",                                  opaque },
 400                 /* 198 */ { "Private",                                  opaque },
 401                 /* 199 */ { "Private",                                  opaque },
 402                 /* 200 */ { "Private",                                  opaque },
 403                 /* 201 */ { "Private",                                  opaque },
 404                 /* 202 */ { "Private",                                  opaque },
 405                 /* 203 */ { "Private",                                  opaque },
 406                 /* 204 */ { "Private",                                  opaque },
 407                 /* 205 */ { "Private",                                  opaque },
 408                 /* 206 */ { "Private",                                  opaque },
 409                 /* 207 */ { "Private",                                  opaque },
 410                 /* 208 */ { "Private",                                  opaque },
 411                 /* 209 */ { "Private",                                  opaque },
 412                 /* 210 */ { "Authentication",                           special }
 413         };
 414
 415         /* Options whose length isn't "vlen + 2". */
 416         switch (code) {
 417
 418         case 0:         /* Padding */
 419                 /* check how much padding we have */
 420                 for (i = voff + 1; i < eoff; i++ ) {
 421                         if (tvb_get_guint8(tvb, i) != 0) {
 422                                 break;
 423                         }
 424                 }
 425                 i = i - voff;
 426                 if (!first_pass) {
 427                         if (bp_tree != NULL) {
 428                                 proto_tree_add_text(bp_tree, tvb, voff, i,
 429                                     "Padding");
 430                         }
 431                 }
 432                 consumed = i;
 433                 return consumed;
 434                 break;
 435
 436         case 255:       /* End Option */
 437                 if (!first_pass) {
 438                         if (bp_tree != NULL) {
 439                                 proto_tree_add_text(bp_tree, tvb, voff, 1,
 440                                     "End Option");
 441                         }
 442                 }
 443                 *at_end = TRUE;
 444                 consumed = 1;
 445                 return consumed;
 446         }
 447
 448         /*
 449          * Get the length of the option, and the number of bytes it
 450          * consumes (the length doesn't include the option code or
 451          * length bytes).
 452          *
 453          * On the first pass, check first whether we have the length
 454          * byte, so that we don't throw an exception; if we throw an
 455          * exception in the first pass, which is only checking for options
 456          * whose values we need in order to properly dissect the packet
 457          * on the second pass, we won't actually dissect the options, so
 458          * you won't be able to see which option had the problem.
 459          */
 460         if (first_pass) {
 461                 if (!tvb_bytes_exist(tvb, voff+1, 1)) {
 462                         /*
 463                          * We don't have the length byte; just return 1
 464                          * as the number of bytes we consumed, to count
 465                          * the code byte.
 466                          */
 467                         return 1;
 468                 }
 469         }
 470         vlen = tvb_get_guint8(tvb, voff+1);
 471         consumed = vlen + 2;
 472
 473         /*
 474          * In the first pass, we don't put anything into the protocol
 475          * tree; we just check for some options we have to look at
 476          * in order to properly process the packet:
 477          *
 478          *      53 (DHCP message type) - if this is present, this is DHCP
 479          *
 480          *      60 (Vendor class identifier) - we need this in order to
 481          *         interpret the vendor-specific info
 482          *
 483          * We also check, before fetching anything, to make sure we
 484          * have the entire item we're fetching, so that we don't throw
 485          * an exception.
 486          */
 487         if (first_pass) {
 488                 if (tvb_bytes_exist(tvb, voff+2, consumed-2)) {
 489                         switch (code) {
 490
 491                         case 53:
 492                                 *dhcp_type_p =
 493                                     get_dhcp_type(tvb_get_guint8(tvb, voff+2));
 494                                 break;
 495
 496                         case 60:
 497                                 *vendor_class_id_p =
 498                                     tvb_get_ptr(tvb, voff+2, consumed-2);
 499                                 break;
 500                         }
 501                 }
 502
 503                 /*
 504                  * We don't do anything else here.
 505                  */
 506                 return consumed;
 507         }
 508
 509         /*
 510          * This is the second pass - if there's a protocol tree to be
 511          * built, we put stuff into it, otherwise we just return.
 512          */
 513         if (bp_tree == NULL) {
 514                 /* Don't put anything in the protocol tree. */
 515                 return consumed;
 516         }
 517
 518         text = opt[code].text;
 519         /* Special cases */
 520         switch (code) {
 521
 522         case 21:        /* Policy Filter */
 523                 if (vlen == 8) {
 524                         /* one IP address pair */
 525                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 526                                 "Option %d: %s = %s/%s", code, text,
 527                                 ip_to_str(tvb_get_ptr(tvb, voff+2, 4)),
 528                                 ip_to_str(tvb_get_ptr(tvb, voff+6, 4)));
 529                 } else {
 530                         /* > 1 IP address pair. Let's make a sub-tree */
 531                         vti = proto_tree_add_text(bp_tree, tvb, voff,
 532                                 consumed, "Option %d: %s", code, text);
 533                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 534                         for (i = voff + 2; i < voff + consumed; i += 8) {
 535                                 proto_tree_add_text(v_tree, tvb, i, 8, "IP Address/Mask: %s/%s",
 536                                         ip_to_str(tvb_get_ptr(tvb, i, 4)),
 537                                         ip_to_str(tvb_get_ptr(tvb, i+4, 4)));
 538                         }
 539                 }
 540                 break;
 541
 542         case 33:        /* Static Route */
 543                 if (vlen == 8) {
 544                         /* one IP address pair */
 545                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 546                                 "Option %d: %s = %s/%s", code, text,
 547                                 ip_to_str(tvb_get_ptr(tvb, voff+2, 4)),
 548                                 ip_to_str(tvb_get_ptr(tvb, voff+6, 4)));
 549                 } else {
 550                         /* > 1 IP address pair. Let's make a sub-tree */
 551                         vti = proto_tree_add_text(bp_tree, tvb, voff,
 552                                 consumed, "Option %d: %s", code, text);
 553                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 554                         for (i = voff + 2; i < voff + consumed; i += 8) {
 555                                 proto_tree_add_text(v_tree, tvb, i, 8,
 556                                         "Destination IP Address/Router: %s/%s",
 557                                         ip_to_str(tvb_get_ptr(tvb, i, 4)),
 558                                         ip_to_str(tvb_get_ptr(tvb, i+4, 4)));
 559                         }
 560                 }
 561                 break;
 562
 563         case 43:        /* Vendor-Specific Info */
 564                 /* PXE protocol 2.1 as described in the intel specs */
 565                 if (*vendor_class_id_p != NULL &&
 566                     strncmp(*vendor_class_id_p, "PXEClient", strlen("PXEClient")) == 0) {
 567                         vti = proto_tree_add_text(bp_tree, tvb, voff,
 568                                 consumed, "Option %d: %s (PXEClient)", code, text);
 569                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 570
 571                         optp = voff+2;
 572                         while (optp < voff+consumed) {
 573                                 optp = dissect_vendor_pxeclient_suboption(v_tree,
 574                                         tvb, optp);
 575                         }
 576                 } else {
 577                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 578                                 "Option %d: %s (%d bytes)", code, text, vlen);
 579                 }
 580                 break;
 581
 582         case 46:        /* NetBIOS-over-TCP/IP Node Type */
 583                 byte = tvb_get_guint8(tvb, voff+2);
 584                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 585                                 "Option %d: %s = %s", code, text,
 586                                 val_to_str(byte, nbnt_vals,
 587                                     "Unknown (0x%02x)"));
 588                 break;
 589
 590         case 52:        /* Option Overload */
 591                 byte = tvb_get_guint8(tvb, voff+2);
 592                 vti = proto_tree_add_text(bp_tree, tvb, voff, consumed,
 593                         "Option %d: %s = %s", code, text,
 594                         val_to_str(byte, opt_overload_vals,
 595                             "Unknown (0x%02x)"));
 596
 597                 /* Just in case we find an option 52 in sname or file */
 598                 if (voff > VENDOR_INFO_OFFSET && byte >= 1 && byte <= 3) {
 599                         o52tree = proto_item_add_subtree(vti, ett_bootp_option);
 600                         if (byte == 1 || byte == 3) {   /* 'file' */
 601                                 vti = proto_tree_add_text (o52tree, tvb,
 602                                         FILE_NAME_OFFSET, FILE_NAME_LEN,
 603                                         "Boot file name option overload");
 604                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 605                                 o52voff = FILE_NAME_OFFSET;
 606                                 o52eoff = FILE_NAME_OFFSET + FILE_NAME_LEN;
 607                                 o52at_end = FALSE;
 608                                 while (o52voff < o52eoff && !o52at_end) {
 609                                         o52voff += bootp_option(tvb, v_tree, o52voff,
 610                                                 o52eoff, FALSE, &o52at_end,
 611                                                 dhcp_type_p, vendor_class_id_p);
 612                                 }
 613                         }
 614                         if (byte == 2 || byte == 3) {   /* 'sname' */
 615                                 vti = proto_tree_add_text (o52tree, tvb,
 616                                         SERVER_NAME_OFFSET, SERVER_NAME_LEN,
 617                                         "Server host name option overload");
 618                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 619                                 o52voff = SERVER_NAME_OFFSET;
 620                                 o52eoff = SERVER_NAME_OFFSET + SERVER_NAME_LEN;
 621                                 o52at_end = FALSE;
 622                                 while (o52voff < o52eoff && !o52at_end) {
 623                                         o52voff += bootp_option(tvb, v_tree, o52voff,
 624                                                 o52eoff, FALSE, &o52at_end,
 625                                                 dhcp_type_p, vendor_class_id_p);
 626                                 }
 627                         }
 628                 }
 629
 630 /*              protocol = tvb_get_guint8(tvb, voff+2);
 631                 proto_tree_add_text(v_tree, tvb, voff+2, 1, "Protocol: %s (%u)",
 632                                     val_to_str(protocol, authen_protocol_vals, "Unknown"),
 633                                     protocol); */
 634                 break;
 635         case 53:        /* DHCP Message Type */
 636                 proto_tree_add_text(bp_tree, tvb, voff, 3, "Option %d: %s = DHCP %s",
 637                         code, text, get_dhcp_type(tvb_get_guint8(tvb, voff+2)));
 638                 break;
 639
 640         case 55:        /* Parameter Request List */
 641                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 642                         vlen + 2, "Option %d: %s", code, text);
 643                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 644                 for (i = 0; i < vlen; i++) {
 645                         byte = tvb_get_guint8(tvb, voff+2+i);
 646                         if (byte < NUM_OPT_INFOS) {
 647                                 proto_tree_add_text(v_tree, tvb, voff+2+i, 1, "%d = %s",
 648                                                 byte, opt[byte].text);
 649                         } else {
 650                                 proto_tree_add_text(vti, tvb, voff+2+i, 1,
 651                                         "Unknown Option Code: %d", byte);
 652                         }
 653                 }
 654                 break;
 655
 656         case 60:        /* Vendor class identifier */
 657                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 658                         "Option %d: %s = \"%.*s\"", code, text, vlen,
 659                         tvb_get_ptr(tvb, voff+2, consumed-2));
 660                 break;
 661
 662         case 61:        /* Client Identifier */
 663                 /* We *MAY* use hwtype/hwaddr. If we have 7 bytes, I'll
 664                    guess that the first is the hwtype, and the last 6
 665                    are the hw addr */
 666                 if (vlen == 7) {
 667                         guint8 htype;
 668
 669                         vti = proto_tree_add_text(bp_tree, tvb, voff,
 670                                 consumed, "Option %d: %s", code, text);
 671                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 672                         htype = tvb_get_guint8(tvb, voff+2);
 673                         proto_tree_add_text(v_tree, tvb, voff+2, 1,
 674                                 "Hardware type: %s",
 675                                 arphrdtype_to_str(htype,
 676                                         "Unknown (0x%02x)"));
 677                         proto_tree_add_text(v_tree, tvb, voff+3, 6,
 678                                 "Client hardware address: %s",
 679                                 arphrdaddr_to_str(tvb_get_ptr(tvb, voff+3, 6),
 680                                         6, htype));
 681                 } else {
 682                         /* otherwise, it's opaque data */
 683                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 684                                 "Option %d: %s (%d bytes)", code, text, vlen);
 685                 }
 686                 break;
 687
 688         case 63:        /* NetWare/IP options */
 689                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 690                     consumed, "Option %d: %s", code, text);
 691                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 692
 693                 optp = voff+2;
 694                 while (optp < voff+consumed)
 695                         optp = dissect_netware_ip_suboption(v_tree, tvb, optp);
 696                 break;
 697
 698         case 82:        /* Relay Agent Information Option */
 699                 vti = proto_tree_add_text(bp_tree, tvb, voff, consumed,
 700                                           "Option %d: %s (%d bytes)",
 701                                           code, text, vlen);
 702                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 703                 optp = voff+2;
 704                 while (optp < voff+consumed) {
 705                         optp = bootp_dhcp_decode_agent_info(v_tree, tvb, optp);
 706                 }
 707                 break;
 708
 709         case 90:        /* DHCP Authentication */
 710         case 210:       /* Was this used for authentication at one time? */
 711                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 712                         vlen + 2, "Option %d: %s", code, text);
 713                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 714
 715                 protocol = tvb_get_guint8(tvb, voff+2);
 716                 proto_tree_add_text(v_tree, tvb, voff+2, 1, "Protocol: %s (%u)",
 717                                     val_to_str(protocol, authen_protocol_vals, "Unknown"),
 718                                     protocol);
 719
 720                 algorithm = tvb_get_guint8(tvb, voff+3);
 721                 switch (protocol) {
 722
 723                 case AUTHEN_PROTO_DELAYED_AUTHEN:
 724                         proto_tree_add_text(v_tree, tvb, voff+3, 1,
 725                                     "Algorithm: %s (%u)",
 726                                     val_to_str(algorithm, authen_da_algo_vals, "Unknown"),
 727                                     algorithm);
 728                         break;
 729
 730                 default:
 731                         proto_tree_add_text(v_tree, tvb, voff+3, 1,
 732                                     "Algorithm: %u", algorithm);
 733                         break;
 734                 }
 735
 736                 rdm = tvb_get_guint8(tvb, voff+4);
 737                 proto_tree_add_text(v_tree, tvb, voff+4, 1,
 738                                     "Replay Detection Method: %s (%u)",
 739                                     val_to_str(rdm, authen_rdm_vals, "Unknown"),
 740                                     rdm);
 741
 742                 switch (rdm) {
 743
 744                 case AUTHEN_RDM_MONOTONIC_COUNTER:
 745                         proto_tree_add_text(v_tree, tvb, voff+5, 8,
 746                                     "Replay Detection Value: %s",
 747                                     u64toh(tvb_get_ptr(tvb, voff+5, 8)));
 748                         break;
 749
 750                 default:
 751                         proto_tree_add_text(v_tree, tvb, voff+5, 8,
 752                                     "Replay Detection Value: %s",
 753                                     tvb_bytes_to_str(tvb, voff+5, 8));
 754                         break;
 755                 }
 756
 757                 switch (protocol) {
 758
 759                 case AUTHEN_PROTO_DELAYED_AUTHEN:
 760                         switch (algorithm) {
 761
 762                         case AUTHEN_DELAYED_ALGO_HMAC_MD5:
 763                                 proto_tree_add_text(v_tree, tvb, voff+13, 4,
 764                                         "Secret ID: 0x%08x",
 765                                         tvb_get_ntohl(tvb, voff+13));
 766                                 proto_tree_add_text(v_tree, tvb, voff+17, 16,
 767                                         "HMAC MD5 Hash: %s",
 768                                         tvb_bytes_to_str(tvb, voff+17, 16));
 769                                 break;
 770
 771                         default:
 772                                 proto_tree_add_text(v_tree, tvb, voff+13, vlen-11,
 773                                         "Authentication Information: %s",
 774                                         tvb_bytes_to_str(tvb, voff+17, vlen-11));
 775                                 break;
 776                         }
 777                         break;
 778
 779                 default:
 780                         proto_tree_add_text(v_tree, tvb, voff+13, vlen-11,
 781                                 "Authentication Information: %s",
 782                                 tvb_bytes_to_str(tvb, voff+17, vlen-11));
 783                         break;
 784                 }
 785                 break;
 786
 787         default:        /* not special */
 788                 break;
 789         }
 790
 791         /* Normal cases */
 792         if (code < NUM_OPT_INFOS) {
 793                 text = opt[code].text;
 794                 ftype = opt[code].ftype;
 795
 796                 switch (ftype) {
 797
 798                 case special:
 799                         return consumed;
 800
 801                 case ipv4:
 802                         if (vlen == 4) {
 803                                 /* one IP address */
 804                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 805                                         "Option %d: %s = %s", code, text,
 806                                         ip_to_str(tvb_get_ptr(tvb, voff+2, 4)));
 807                         } else {
 808                                 /* > 1 IP addresses. Let's make a sub-tree */
 809                                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 810                                         consumed, "Option %d: %s", code, text);
 811                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 812                                 for (i = voff + 2; i < voff + consumed; i += 4) {
 813                                         proto_tree_add_text(v_tree, tvb, i, 4, "IP Address: %s",
 814                                                 ip_to_str(tvb_get_ptr(tvb, i, 4)));
 815                                 }
 816                         }
 817                         break;
 818
 819                 case string:
 820                         /* Fix for non null-terminated string supplied by
 821                          * John Lines <John.Lines@aeat.co.uk>
 822                          */
 823                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 824                                         "Option %d: %s = \"%.*s\"", code, text, vlen,
 825                                         tvb_get_ptr(tvb, voff+2, consumed-2));
 826                         break;
 827
 828                 case opaque:
 829                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 830                                         "Option %d: %s (%d bytes)",
 831                                         code, text, vlen);
 832                         break;
 833
 834                 case val_u_short:
 835                         if (vlen == 2) {
 836                                 /* one gushort */
 837                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 838                                                 "Option %d: %s = %d", code, text,
 839                                                 tvb_get_ntohs(tvb, voff+2));
 840                         } else {
 841                                 /* > 1 gushort */
 842                                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 843                                         consumed, "Option %d: %s", code, text);
 844                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 845                                 for (i = voff + 2; i < voff + consumed; i += 2) {
 846                                         proto_tree_add_text(v_tree, tvb, i, 4, "Value: %d",
 847                                                 tvb_get_ntohs(tvb, i));
 848                                 }
 849                         }
 850                         break;
 851
 852                 case val_u_long:
 853                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 854                                         "Option %d: %s = %d", code, text,
 855                                         tvb_get_ntohl(tvb, voff+2));
 856                         break;
 857
 858                 case val_u_byte:
 859                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 860                                         "Option %d: %s = %d", code, text,
 861                                         tvb_get_guint8(tvb, voff+2));
 862                         break;
 863
 864                 case toggle:
 865                         i = tvb_get_guint8(tvb, voff+2);
 866                         if (i != 0 && i != 1) {
 867                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 868                                                 "Option %d: %s = Invalid Value %d", code, text,
 869                                                 i);
 870                         } else {
 871                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 872                                                 "Option %d: %s = %s", code, text,
 873                                                 i == 0 ? "Disabled" : "Enabled");
 874                         }
 875                         break;
 876
 877                 case yes_no:
 878                         i = tvb_get_guint8(tvb, voff+2);
 879                         if (i != 0 && i != 1) {
 880                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 881                                                 "Option %d: %s = Invalid Value %d", code, text,
 882                                                 i);
 883                         } else {
 884                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 885                                                 "Option %d: %s = %s", code, text,
 886                                                 i == 0 ? "No" : "Yes");
 887                         }
 888                         break;
 889
 890                 case time_in_secs:
 891                         time_secs = tvb_get_ntohl(tvb, voff+2);
 892                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 893                                 "Option %d: %s = %s", code, text,
 894                                 ((time_secs == 0xffffffff) ?
 895                                     "infinity" :
 896                                     time_secs_to_str(time_secs)));
 897                         break;
 898
 899                 default:
 900                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 901                                         "Option %d: %s (%d bytes)", code, text, vlen);
 902                 }
 903         } else {
 904                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 905                                 "Unknown Option Code: %d (%d bytes)", code, vlen);
 906         }
 907
 908         return consumed;
 909 }
 910
 911 static int
 912 bootp_dhcp_decode_agent_info(proto_tree *v_tree, tvbuff_t *tvb, int optp)
 913 {
 914         guint8 subopt;
 915         guint8 subopt_len;
 916
 917         subopt = tvb_get_guint8(tvb, optp);
 918         subopt_len = tvb_get_guint8(tvb, optp+1);
 919         switch (subopt) {
 920         case 1:
 921                 proto_tree_add_text(v_tree, tvb, optp, subopt_len + 2,
 922                                     "Agent Circuit ID (%d bytes)", subopt_len);
 923                 break;
 924         case 2:
 925                 proto_tree_add_text(v_tree, tvb, optp, subopt_len + 2,
 926                                     "Agent Remote ID (%d bytes)", subopt_len);
 927                 break;
 928         default:
 929                 proto_tree_add_text(v_tree, tvb, optp, subopt_len + 2,
 930                                     "Unknown agent option: %d", subopt);
 931                 break;
 932         }
 933         optp += (subopt_len + 2);
 934         return optp;
 935 }
 936
 937 static int
 938 dissect_vendor_pxeclient_suboption(proto_tree *v_tree, tvbuff_t *tvb, int optp)
 939 {
 940         guint8 subopt;
 941         guint8 subopt_len;
 942         int slask;
 943         proto_tree *o43pxeclient_v_tree;
 944         proto_item *vti;
 945
 946         struct o43pxeclient_opt_info {
 947                 char    *text;
 948                 enum field_type ft;
 949         };
 950
 951         static struct o43pxeclient_opt_info o43pxeclient_opt[]= {
 952                 /* 0 */ {"nop", special},       /* dummy */
 953                 /* 1 */ {"PXE mtftp IP", ipv4},
 954                 /* 2 */ {"PXE mtftp client port", val_u_le_short},
 955                 /* 3 */ {"PXE mtftp server port",val_u_le_short},
 956                 /* 4 */ {"PXE mtftp timeout", val_u_byte},
 957                 /* 5 */ {"PXE mtftp delay", val_u_byte},
 958                 /* 6 */ {"PXE discovery control", val_u_byte},
 959                         /*
 960                          * Correct: b0 (lsb): disable broadcast discovery
 961                          *      b1: disable multicast discovery
 962                          *      b2: only use/accept servers in boot servers
 963                          *      b3: download bootfile without prompt/menu/disc
 964                          */
 965                 /* 7 */ {"PXE multicast address", ipv4},
 966                 /* 8 */ {"PXE boot servers", special},
 967                 /* 9 */ {"PXE boot menu", special},
 968                 /* 10 */ {"PXE menu prompt", special},
 969                 /* 11 */ {"PXE multicast address alloc", special},
 970                 /* 12 */ {"PXE credential types", special},
 971                 /* 71 {"PXE boot item", special} */
 972                 /* 255 {"PXE end options", special} */
 973         };
 974 #define NUM_O43PXECLIENT_SUBOPTS (12)
 975
 976         subopt = tvb_get_guint8(tvb, optp);
 977
 978         if (subopt == 0 ) {
 979                 proto_tree_add_text(v_tree, tvb, optp, 1, "Padding");
 980                 return (optp+1);
 981         } else if (subopt == 255) {     /* End Option */
 982                 proto_tree_add_text(v_tree, tvb, optp, 1, "End PXEClient option");
 983                 /* Make sure we skip any junk left this option */
 984                 return (optp+255);
 985         }
 986
 987         subopt_len = tvb_get_guint8(tvb, optp+1);
 988
 989         if ( subopt == 71 ) {   /* 71 {"PXE boot item", special} */
 990                 /* case special */
 991                 /* I may need to decode that properly one day */
 992                 proto_tree_add_text(v_tree, tvb, optp, subopt_len+2,
 993                         "Suboption %d: %s (%d byte%s)" ,
 994                         subopt, "PXE boot item",
 995                         subopt_len, (subopt_len != 1)?"s":"");
 996         } else if ( (subopt < 1 ) || (subopt > NUM_O43PXECLIENT_SUBOPTS) ) {
 997                 proto_tree_add_text(v_tree, tvb, optp, subopt_len+2,
 998                         "Unknown suboption %d (%d byte%s)", subopt, subopt_len,
 999                         (subopt_len != 1)?"s":"");
1000         } else {
1001                 switch (o43pxeclient_opt[subopt].ft) {
1002
1003 /* XXX          case string:
1004                         proto_tree_add_text(v_tree, tvb, optp, subopt_len+2,
1005                                 "Suboption %d: %s", subopt, o43pxeclient_opt[subopt].text);
1006                         break;
1007    XXX */
1008                 case special:
1009                         /* I may need to decode that properly one day */
1010                         proto_tree_add_text(v_tree, tvb, optp, subopt_len+2,
1011                                 "Suboption %d: %s (%d byte%s)" ,
1012                                 subopt, o43pxeclient_opt[subopt].text,
1013                                 subopt_len, (subopt_len != 1)?"s":"");
1014                         break;
1015
1016                 case val_u_le_short:
1017                         proto_tree_add_text(v_tree, tvb, optp, 4, "Suboption %d: %s = %u",
1018                             subopt, o43pxeclient_opt[subopt].text,
1019                             tvb_get_letohs(tvb, optp+2));
1020                         break;
1021
1022                 case val_u_byte:
1023                         proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s = %u",
1024                             subopt, o43pxeclient_opt[subopt].text,
1025                             tvb_get_guint8(tvb, optp+2));
1026                         break;
1027
1028                 case ipv4:
1029                         if (subopt_len == 4) {
1030                                 /* one IP address */
1031                                 proto_tree_add_text(v_tree, tvb, optp, 6,
1032                                     "Suboption %d : %s = %s",
1033                                     subopt, o43pxeclient_opt[subopt].text,
1034                                     ip_to_str(tvb_get_ptr(tvb, optp+2, 4)));
1035                         } else {
1036                                 /* > 1 IP addresses. Let's make a sub-tree */
1037                                 vti = proto_tree_add_text(v_tree, tvb, optp,
1038                                     subopt_len+2, "Suboption %d: %s",
1039                                     subopt, o43pxeclient_opt[subopt].text);
1040                                 o43pxeclient_v_tree = proto_item_add_subtree(vti, ett_bootp_option);
1041                                 for (slask = optp + 2 ; slask < optp+subopt_len; slask += 4) {
1042                                         proto_tree_add_text(o43pxeclient_v_tree, tvb, slask, 4, "IP Address: %s",
1043                                             ip_to_str(tvb_get_ptr(tvb, slask, 4)));
1044                                 }
1045                         }
1046                         break;
1047                 default:
1048                         proto_tree_add_text(v_tree, tvb, optp, subopt_len+2,"ERROR, please report: Unknown subopt type handler %d", subopt);
1049                         break;
1050                 }
1051         }
1052         optp += (subopt_len + 2);
1053         return optp;
1054 }
1055
1056 static int
1057 dissect_netware_ip_suboption(proto_tree *v_tree, tvbuff_t *tvb, int optp)
1058 {
1059         guint8 subopt;
1060         guint8 subopt_len;
1061         int slask;
1062         proto_tree *o63_v_tree;
1063         proto_item *vti;
1064
1065         struct o63_opt_info {
1066                 char    *truet;
1067                 char    *falset;
1068                 enum field_type ft;
1069         };
1070
1071         static struct o63_opt_info o63_opt[]= {
1072                 /* 0 */ {"","",none},
1073                 /* 1 */ {"NWIP does not exist on subnet","",string},
1074                 /* 2 */ {"NWIP exist in options area","",string},
1075                 /* 3 */ {"NWIP exists in sname/file","",string},
1076                 /* 4 */ {"NWIP exists, but too big","",string},
1077                 /* 5 */ {"Broadcast for nearest Netware server","Do NOT Broadcast for nearest Netware server",yes_no},
1078                 /* 6 */ {"Preferred DSS server","",ipv4},
1079                 /* 7 */ {"Nearest NWIP server","",ipv4},
1080                 /* 8 */ {"Autoretries","",val_u_short},
1081                 /* 9 */ {"Autoretry delay, secs ","",val_u_short},
1082                 /* 10*/ {"Support NetWare/IP v1.1","Do NOT support NetWare/IP v1.1",yes_no},
1083                 /* 11*/ {"Primary DSS ", "" , special}
1084         };
1085
1086         subopt = tvb_get_guint8(tvb, optp);
1087         if (subopt > NUM_O63_SUBOPTS) {
1088                 proto_tree_add_text(v_tree, tvb,optp,1,"Unknown suboption %d", subopt);
1089                 optp++;
1090         } else {
1091                 switch (o63_opt[subopt].ft) {
1092
1093                 case string:
1094                         proto_tree_add_text(v_tree, tvb, optp, 2, "Suboption %d: %s", subopt, o63_opt[subopt].truet);
1095                         optp+=2;
1096                         break;
1097
1098                 case yes_no:
1099                         if (tvb_get_guint8(tvb, optp+2)==1) {
1100                                 proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s", subopt, o63_opt[subopt].truet);
1101                         } else {
1102                                 proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s" , subopt, o63_opt[subopt].falset);
1103                         }
1104                         optp+=3;
1105                         break;
1106
1107                 case special:
1108                         proto_tree_add_text(v_tree, tvb, optp, 6,
1109                             "Suboption %d: %s = %s" ,
1110                             subopt, o63_opt[subopt].truet,
1111                             ip_to_str(tvb_get_ptr(tvb, optp+2, 4)));
1112                         optp=optp+6;
1113                         break;
1114
1115                 case val_u_short:
1116                         proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s = %u",
1117                             subopt, o63_opt[subopt].truet,
1118                             tvb_get_guint8(tvb, optp+2));       /* XXX - 1 byte? */
1119                         optp+=3;
1120                         break;
1121
1122                 case ipv4:
1123                         subopt_len = tvb_get_guint8(tvb, optp+1);
1124                         if (subopt_len == 4) {
1125                                 /* one IP address */
1126                                 proto_tree_add_text(v_tree, tvb, optp, 6,
1127                                     "Suboption %d : %s = %s",
1128                                     subopt, o63_opt[subopt].truet,
1129                                     ip_to_str(tvb_get_ptr(tvb, optp+2, 4)));
1130                                 optp=optp+6;
1131                         } else {
1132                                 /* > 1 IP addresses. Let's make a sub-tree */
1133                                 vti = proto_tree_add_text(v_tree, tvb, optp,
1134                                     subopt_len+2, "Suboption %d: %s",
1135                                     subopt, o63_opt[subopt].truet);
1136                                 o63_v_tree = proto_item_add_subtree(vti, ett_bootp_option);
1137                                 for (slask = optp + 2 ; slask < optp+subopt_len; slask += 4) {
1138                                         proto_tree_add_text(o63_v_tree, tvb, slask, 4, "IP Address: %s",
1139                                             ip_to_str(tvb_get_ptr(tvb, slask, 4)));
1140                                 }
1141                                 optp=slask;
1142                         }
1143                         break;
1144                 default:
1145                         proto_tree_add_text(v_tree, tvb,optp,1,"Unknown suboption %d", subopt);
1146                         optp++;
1147                         break;
1148                 }
1149         }
1150         return optp;
1151 }
1152
1153 #define BOOTREQUEST     1
1154 #define BOOTREPLY       2
1155
1156 static const value_string op_vals[] = {
1157         { BOOTREQUEST,  "Boot Request" },
1158         { BOOTREPLY,    "Boot Reply" },
1159         { 0,            NULL }
1160 };
1161
1162 static void
1163 dissect_bootp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1164 {
1165         proto_tree      *bp_tree = NULL;
1166         proto_item      *ti;
1167         proto_tree      *flag_tree = NULL;
1168         proto_item      *fi;
1169         guint8          op;
1170         guint8          htype, hlen;
1171         const guint8    *haddr;
1172         int             voff, eoff, tmpvoff; /* vendor offset, end offset */
1173         guint32         ip_addr;
1174         gboolean        at_end;
1175         const char      *dhcp_type = NULL;
1176         const guint8    *vendor_class_id = NULL;
1177         guint16         flags;
1178
1179         if (check_col(pinfo->cinfo, COL_PROTOCOL))
1180                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "BOOTP");
1181         if (check_col(pinfo->cinfo, COL_INFO)) {
1182                 /*
1183                  * In case we throw an exception fetching the opcode, etc.
1184                  */
1185                 col_clear(pinfo->cinfo, COL_INFO);
1186         }
1187
1188         op = tvb_get_guint8(tvb, 0);
1189         htype = tvb_get_guint8(tvb, 1);
1190         hlen = tvb_get_guint8(tvb, 2);
1191         if (check_col(pinfo->cinfo, COL_INFO)) {
1192                 switch (op) {
1193
1194                 case BOOTREQUEST:
1195                         col_add_fstr(pinfo->cinfo, COL_INFO, "Boot Request from %s",
1196                                 arphrdaddr_to_str(tvb_get_ptr(tvb, 28, hlen),
1197                                         hlen, htype));
1198                         break;
1199
1200                 case BOOTREPLY:
1201                         col_set_str(pinfo->cinfo, COL_INFO, "Boot Reply");
1202                         break;
1203
1204                 default:
1205                         col_add_fstr(pinfo->cinfo, COL_INFO, "Unknown BOOTP message type (%u)",
1206                             op);
1207                         break;
1208                 }
1209         }
1210
1211         if (tree) {
1212                 ti = proto_tree_add_item(tree, proto_bootp, tvb, 0, -1, FALSE);
1213                 bp_tree = proto_item_add_subtree(ti, ett_bootp);
1214
1215                 proto_tree_add_uint(bp_tree, hf_bootp_type, tvb,
1216                                            0, 1,
1217                                            op);
1218                 proto_tree_add_uint_format(bp_tree, hf_bootp_hw_type, tvb,
1219                                            1, 1,
1220                                            htype,
1221                                            "Hardware type: %s",
1222                                            arphrdtype_to_str(htype,
1223                                                              "Unknown (0x%02x)"));
1224                 proto_tree_add_uint(bp_tree, hf_bootp_hw_len, tvb,
1225                                     2, 1, hlen);
1226                 proto_tree_add_item(bp_tree, hf_bootp_hops, tvb,
1227                                     3, 1, FALSE);
1228                 proto_tree_add_item(bp_tree, hf_bootp_id, tvb,
1229                                     4, 4, FALSE);
1230                 proto_tree_add_item(bp_tree, hf_bootp_secs, tvb,
1231                                     8, 2, FALSE);
1232                 flags = tvb_get_ntohs(tvb, 10);
1233                 fi = proto_tree_add_uint(bp_tree, hf_bootp_flags, tvb,
1234                                     10, 2, flags);
1235                 proto_item_append_text(fi, " (%s)",
1236                     (flags & BOOTP_BC) ? "Broadcast" : "Unicast");
1237                 flag_tree = proto_item_add_subtree(fi, ett_bootp_flags);
1238                 proto_tree_add_boolean(flag_tree, hf_bootp_flags_broadcast, tvb,
1239                                     10, 2, flags);
1240                 proto_tree_add_uint(flag_tree, hf_bootp_flags_reserved, tvb,
1241                                     10, 2, flags);
1242                 proto_tree_add_item(bp_tree, hf_bootp_ip_client, tvb,
1243                                     12, 4, FALSE);
1244                 proto_tree_add_item(bp_tree, hf_bootp_ip_your, tvb,
1245                                     16, 4, FALSE);
1246                 proto_tree_add_item(bp_tree, hf_bootp_ip_server, tvb,
1247                                     20, 4, FALSE);
1248                 proto_tree_add_item(bp_tree, hf_bootp_ip_relay, tvb,
1249                                     24, 4, FALSE);
1250
1251                 if (hlen > 0) {
1252                         haddr = tvb_get_ptr(tvb, 28, hlen);
1253                         proto_tree_add_bytes_format(bp_tree, hf_bootp_hw_addr, tvb,
1254                                                    28, hlen,
1255                                                    haddr,
1256                                                    "Client hardware address: %s",
1257                                                    arphrdaddr_to_str(haddr,
1258                                                                      hlen,
1259                                                                      htype));
1260                 }
1261                 else {
1262                         proto_tree_add_text(bp_tree,  tvb,
1263                                                    28, 0, "Client address not given");
1264                 }
1265
1266                 /* The server host name is optional */
1267                 if (tvb_get_guint8(tvb, 44) != '\0') {
1268                         proto_tree_add_item(bp_tree, hf_bootp_server, tvb,
1269                                                    SERVER_NAME_OFFSET,
1270                                                    SERVER_NAME_LEN, FALSE);
1271                 }
1272                 else {
1273                         proto_tree_add_string_format(bp_tree, hf_bootp_server, tvb,
1274                                                    SERVER_NAME_OFFSET,
1275                                                    SERVER_NAME_LEN,
1276                                                    tvb_get_ptr(tvb, SERVER_NAME_OFFSET, 1),
1277                                                    "Server host name not given");
1278                 }
1279
1280                 /* Boot file */
1281                 if (tvb_get_guint8(tvb, 108) != '\0') {
1282                         proto_tree_add_item(bp_tree, hf_bootp_file, tvb,
1283                                                    FILE_NAME_OFFSET,
1284                                                    FILE_NAME_LEN, FALSE);
1285                 }
1286                 else {
1287                         proto_tree_add_string_format(bp_tree, hf_bootp_file, tvb,
1288                                                    FILE_NAME_OFFSET,
1289                                                    FILE_NAME_LEN,
1290                                                    tvb_get_ptr(tvb, FILE_NAME_OFFSET, 1),
1291                                                    "Boot file name not given");
1292                 }
1293         }
1294
1295         voff = VENDOR_INFO_OFFSET;
1296
1297         /* rfc2132 says it SHOULD exist, not that it MUST exist */
1298         if (tvb_bytes_exist(tvb, voff, 4)) {
1299                 if (tvb_get_ntohl(tvb, voff) == 0x63825363) {
1300                         if (tree) {
1301                                 tvb_memcpy(tvb, (void *)&ip_addr, voff, sizeof(ip_addr));
1302                                 proto_tree_add_ipv4_format(bp_tree, hf_bootp_cookie, tvb,
1303                                     voff, 4, ip_addr,
1304                                     "Magic cookie: (OK)");
1305                         }
1306                         voff += 4;
1307                 }
1308                 else {
1309                         if (tree) {
1310                                 proto_tree_add_text(bp_tree,  tvb,
1311                                         voff, 64, "Bootp vendor specific options");
1312                         }
1313                         voff += 64;
1314                 }
1315         }
1316
1317         eoff = tvb_reported_length(tvb);
1318
1319         /*
1320          * In the first pass, we just look for the DHCP message type
1321          * and Vendor class identifier options.
1322          */
1323         tmpvoff = voff;
1324         at_end = FALSE;
1325         while (tmpvoff < eoff && !at_end) {
1326                 tmpvoff += bootp_option(tvb, 0, tmpvoff, eoff, TRUE, &at_end,
1327                     &dhcp_type, &vendor_class_id);
1328         }
1329
1330         /*
1331          * If there was a DHCP message type option, flag this packet
1332          * as DHCP.
1333          */
1334         if (dhcp_type != NULL) {
1335                 /*
1336                  * Yes, this is a DHCP packet, and "dhcp_type" is the
1337                  * packet type.
1338                  */
1339                 if (check_col(pinfo->cinfo, COL_PROTOCOL))
1340                         col_set_str(pinfo->cinfo, COL_PROTOCOL, "DHCP");
1341                 if (check_col(pinfo->cinfo, COL_INFO))
1342                         col_add_fstr(pinfo->cinfo, COL_INFO, "DHCP %-8s - Transaction ID 0x%x",
1343                             dhcp_type, tvb_get_ntohl(tvb, 4));
1344                 if (tree)
1345                         proto_tree_add_boolean_hidden(bp_tree, hf_bootp_dhcp,
1346                             tvb, 0, 0, 1);
1347                 tap_queue_packet( bootp_dhcp_tap, pinfo, (gpointer) dhcp_type);
1348         }
1349
1350         /*
1351          * If we're not building the protocol tree, we don't need to
1352          * make a second pass.
1353          */
1354         if (tree == NULL)
1355                 return;
1356
1357         /*
1358          * OK, now build the protocol tree.
1359          */
1360         at_end = FALSE;
1361         while (voff < eoff && !at_end) {
1362                 voff += bootp_option(tvb, bp_tree, voff, eoff, FALSE, &at_end,
1363                     &dhcp_type, &vendor_class_id);
1364         }
1365         if (voff < eoff) {
1366                 /*
1367                  * Padding after the end option.
1368                  */
1369                 proto_tree_add_text(bp_tree, tvb, voff, eoff - voff, "Padding");
1370         }
1371 }
1372
1373 void
1374 proto_register_bootp(void)
1375 {
1376   static hf_register_info hf[] = {
1377     { &hf_bootp_dhcp,
1378       { "Frame is DHCP",                "bootp.dhcp",    FT_BOOLEAN,
1379         BASE_NONE,                      NULL,            0x0,
1380         "", HFILL }},
1381
1382     { &hf_bootp_type,
1383       { "Message type",                 "bootp.type",    FT_UINT8,
1384          BASE_DEC,                      VALS(op_vals),   0x0,
1385         "", HFILL }},
1386
1387     { &hf_bootp_hw_type,
1388       { "Hardware type",                "bootp.hw.type", FT_UINT8,
1389         BASE_HEX,                       NULL,            0x0,
1390         "", HFILL }},
1391
1392     { &hf_bootp_hw_len,
1393       { "Hardware address length",      "bootp.hw.len",  FT_UINT8,
1394         BASE_DEC,                       NULL,            0x0,
1395         "", HFILL }},
1396
1397     { &hf_bootp_hops,
1398       { "Hops",                         "bootp.hops",    FT_UINT8,
1399         BASE_DEC,                       NULL,            0x0,
1400         "", HFILL }},
1401
1402     { &hf_bootp_id,
1403       { "Transaction ID",               "bootp.id",      FT_UINT32,
1404         BASE_HEX,                        NULL,           0x0,
1405         "", HFILL }},
1406
1407     { &hf_bootp_secs,
1408       { "Seconds elapsed",              "bootp.secs",    FT_UINT16,
1409         BASE_DEC,                        NULL,           0x0,
1410         "", HFILL }},
1411
1412     { &hf_bootp_flags,
1413       { "Bootp flags",                  "bootp.flags",   FT_UINT16,
1414         BASE_HEX,                       NULL,            0x0,
1415         "", HFILL }},
1416
1417     { &hf_bootp_flags_broadcast,
1418       { "Broadcast flag",               "bootp.flags.bc", FT_BOOLEAN,
1419         16,                     TFS(&flag_set_broadcast), BOOTP_BC,
1420         "", HFILL }},
1421
1422     { &hf_bootp_flags_reserved,
1423       { "Reserved flags",               "bootp.flags.reserved", FT_UINT16,
1424         BASE_HEX,                       NULL,           BOOTP_MBZ,
1425         "", HFILL }},
1426
1427     { &hf_bootp_ip_client,
1428       { "Client IP address",            "bootp.ip.client",FT_IPv4,
1429         BASE_NONE,                      NULL,             0x0,
1430         "", HFILL }},
1431
1432     { &hf_bootp_ip_your,
1433       { "Your (client) IP address",     "bootp.ip.your",  FT_IPv4,
1434         BASE_NONE,                      NULL,             0x0,
1435         "", HFILL }},
1436
1437     { &hf_bootp_ip_server,
1438       { "Next server IP address",       "bootp.ip.server",FT_IPv4,
1439         BASE_NONE,                      NULL,             0x0,
1440         "", HFILL }},
1441
1442     { &hf_bootp_ip_relay,
1443       { "Relay agent IP address",       "bootp.ip.relay", FT_IPv4,
1444         BASE_NONE,                      NULL,             0x0,
1445         "", HFILL }},
1446
1447     { &hf_bootp_hw_addr,
1448       { "Client hardware address",      "bootp.hw.addr", FT_BYTES,
1449         BASE_NONE,                      NULL,            0x0,
1450         "", HFILL }},
1451
1452     { &hf_bootp_server,
1453       { "Server host name",             "bootp.server",  FT_STRING,
1454         BASE_NONE,                      NULL,            0x0,
1455         "", HFILL }},
1456
1457     { &hf_bootp_file,
1458       { "Boot file name",               "bootp.file",    FT_STRING,
1459         BASE_NONE,                      NULL,            0x0,
1460         "", HFILL }},
1461
1462     { &hf_bootp_cookie,
1463       { "Magic cookie",                 "bootp.cookie",  FT_IPv4,
1464          BASE_NONE,                     NULL,            0x0,
1465         "", HFILL }},
1466
1467     { &hf_bootp_vendor,
1468       { "Bootp Vendor Options",         "bootp.vendor", FT_BYTES,
1469         BASE_NONE,                      NULL,            0x0,
1470         "", HFILL }},
1471   };
1472   static gint *ett[] = {
1473     &ett_bootp,
1474     &ett_bootp_flags,
1475     &ett_bootp_option,
1476   };
1477
1478   proto_bootp = proto_register_protocol("Bootstrap Protocol", "BOOTP/DHCP",
1479                                         "bootp");
1480   proto_register_field_array(proto_bootp, hf, array_length(hf));
1481   proto_register_subtree_array(ett, array_length(ett));
1482   bootp_dhcp_tap = register_tap("bootp");
1483 }
1484
1485 void
1486 proto_reg_handoff_bootp(void)
1487 {
1488   dissector_handle_t bootp_handle;
1489
1490   bootp_handle = create_dissector_handle(dissect_bootp, proto_bootp);
1491   dissector_add("udp.port", UDP_PORT_BOOTPS, bootp_handle);
1492   dissector_add("udp.port", UDP_PORT_BOOTPC, bootp_handle);
1493 }