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 1.73 2003/02/13 08:29:19 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 static int proto_bootp = -1;
  50 static int hf_bootp_type = -1;
  51 static int hf_bootp_hw_type = -1;
  52 static int hf_bootp_hw_len = -1;
  53 static int hf_bootp_hops = -1;
  54 static int hf_bootp_id = -1;
  55 static int hf_bootp_secs = -1;
  56 static int hf_bootp_flags = -1;
  57 static int hf_bootp_flags_broadcast = -1;
  58 static int hf_bootp_flags_reserved = -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_vendor = -1;
  68 static int hf_bootp_dhcp = -1;
  69
  70 static guint ett_bootp = -1;
  71 static guint ett_bootp_flags = -1;
  72 static guint ett_bootp_option = -1;
  73
  74 #define UDP_PORT_BOOTPS  67
  75 #define UDP_PORT_BOOTPC  68
  76
  77 #define BOOTP_BC        0x8000
  78 #define BOOTP_MBZ       0x7FFF
  79
  80 enum field_type { none, ipv4, string, toggle, yes_no, special, opaque,
  81         time_in_secs,
  82         val_u_byte, val_u_short, val_u_le_short, val_u_long,
  83         val_s_long };
  84
  85 struct opt_info {
  86         char    *text;
  87         enum field_type ftype;
  88 };
  89
  90 static const true_false_string flag_set_broadcast = {
  91   "Broadcast",
  92   "Unicast"
  93 };
  94
  95 #define NUM_OPT_INFOS 211
  96 #define NUM_O63_SUBOPTS 11
  97
  98 static int dissect_vendor_pxeclient_suboption(proto_tree *v_tree, tvbuff_t *tvb,
  99     int optp);
 100 static int dissect_netware_ip_suboption(proto_tree *v_tree, tvbuff_t *tvb,
 101     int optp);
 102 static int bootp_dhcp_decode_agent_info(proto_tree *v_tree, tvbuff_t *tvb,
 103     int optp);
 104
 105 static const char *
 106 get_dhcp_type(guint8 byte)
 107 {
 108         static const char       *opt53_text[] = {
 109                 "Unknown Message Type",
 110                 "Discover",
 111                 "Offer",
 112                 "Request",
 113                 "Decline",
 114                 "ACK",
 115                 "NAK",
 116                 "Release",
 117                 "Inform",
 118                 "Force Renew"
 119         };
 120         int i;
 121
 122         if (byte > 0 && byte < (sizeof opt53_text / sizeof opt53_text[0]))
 123                 i = byte;
 124         else
 125                 i = 0;
 126         return opt53_text[i];
 127 }
 128
 129 /* DHCP Authentication protocols */
 130 #define AUTHEN_PROTO_CONFIG_TOKEN       0
 131 #define AUTHEN_PROTO_DELAYED_AUTHEN     1
 132
 133 /* DHCP Authentication algorithms for delayed authentication */
 134 #define AUTHEN_DELAYED_ALGO_HMAC_MD5    1
 135
 136 /* DHCP Authentication Replay Detection Methods */
 137 #define AUTHEN_RDM_MONOTONIC_COUNTER    0x00
 138
 139 /* DHCP Option Overload (option code 52) */
 140 #define OPT_OVERLOAD_FILE               1
 141 #define OPT_OVERLOAD_SNAME              2
 142 #define OPT_OVERLOAD_BOTH               3
 143
 144 /* Server name and boot file offsets and lengths */
 145 #define SERVER_NAME_OFFSET              44
 146 #define SERVER_NAME_LEN                 64
 147 #define FILE_NAME_OFFSET                108
 148 #define FILE_NAME_LEN                   128
 149 #define VENDOR_INFO_OFFSET              236
 150
 151 /* Returns the number of bytes consumed by this option. */
 152 static int
 153 bootp_option(tvbuff_t *tvb, proto_tree *bp_tree, int voff, int eoff,
 154     gboolean first_pass, gboolean *at_end, const char **dhcp_type_p,
 155     const guint8 **vendor_class_id_p)
 156 {
 157         char                    *text;
 158         enum field_type         ftype;
 159         guchar                  code = tvb_get_guint8(tvb, voff);
 160         int                     vlen;
 161         guchar                  byte;
 162         int                     i,optp, consumed;
 163         gulong                  time_secs;
 164         proto_tree              *v_tree, *o52tree;
 165         proto_item              *vti;
 166         guint8                  protocol;
 167         guint8                  algorithm;
 168         guint8                  rdm;
 169         int                     o52voff, o52eoff;
 170         gboolean                o52at_end;
 171
 172         static const value_string nbnt_vals[] = {
 173             {0x1,   "B-node" },
 174             {0x2,   "P-node" },
 175             {0x4,   "M-node" },
 176             {0x8,   "H-node" },
 177             {0,     NULL     } };
 178
 179         static const value_string authen_protocol_vals[] = {
 180             {AUTHEN_PROTO_CONFIG_TOKEN,   "configuration token" },
 181             {AUTHEN_PROTO_DELAYED_AUTHEN, "delayed authentication" },
 182             {0,                           NULL     } };
 183
 184         static const value_string authen_da_algo_vals[] = {
 185             {AUTHEN_DELAYED_ALGO_HMAC_MD5, "HMAC_MD5" },
 186             {0,                            NULL     } };
 187
 188         static const value_string authen_rdm_vals[] = {
 189             {AUTHEN_RDM_MONOTONIC_COUNTER, "Monotonically-increasing counter" },
 190             {0,                            NULL     } };
 191
 192         static const value_string opt_overload_vals[] = {
 193             { OPT_OVERLOAD_FILE,  "Boot file name holds options",                },
 194             { OPT_OVERLOAD_SNAME, "Server host name holds options",              },
 195             { OPT_OVERLOAD_BOTH,  "Boot file and server host names hold options" },
 196             { 0,                  NULL                                           } };
 197
 198         static struct opt_info opt[] = {
 199                 /*   0 */ { "Padding",                                                          none },
 200                 /*   1 */ { "Subnet Mask",                                                      ipv4 },
 201                 /*   2 */ { "Time Offset",                                                      val_s_long },
 202                 /*   3 */ { "Router",                                                           ipv4 },
 203                 /*   4 */ { "Time Server",                                                      ipv4 },
 204                 /*   5 */ { "Name Server",                                                      ipv4 },
 205                 /*   6 */ { "Domain Name Server",                                       ipv4 },
 206                 /*   7 */ { "Log Server",                                                       ipv4 },
 207                 /*   8 */ { "Cookie Server",                                            ipv4 },
 208                 /*   9 */ { "LPR Server",                                                       ipv4 },
 209                 /*  10 */ { "Impress Server",                                           ipv4 },
 210                 /*  11 */ { "Resource Location Server",                         ipv4 },
 211                 /*  12 */ { "Host Name",                                                        string },
 212                 /*  13 */ { "Boot File Size",                                           val_u_short },
 213                 /*  14 */ { "Merit Dump File",                                          string },
 214                 /*  15 */ { "Domain Name",                                                      string },
 215                 /*  16 */ { "Swap Server",                                                      ipv4 },
 216                 /*  17 */ { "Root Path",                                                        string },
 217                 /*  18 */ { "Extensions Path",                                          string },
 218                 /*  19 */ { "IP Forwarding",                                            toggle },
 219                 /*  20 */ { "Non-Local Source Routing",                         toggle },
 220                 /*  21 */ { "Policy Filter",                                            special },
 221                 /*  22 */ { "Maximum Datagram Reassembly Size",         val_u_short },
 222                 /*  23 */ { "Default IP Time-to-Live",                          val_u_byte },
 223                 /*  24 */ { "Path MTU Aging Timeout",                           time_in_secs },
 224                 /*  25 */ { "Path MTU Plateau Table",                           val_u_short },
 225                 /*  26 */ { "Interface MTU",                                            val_u_short },
 226                 /*  27 */ { "All Subnets are Local",                            yes_no },
 227                 /*  28 */ { "Broadcast Address",                                        ipv4 },
 228                 /*  29 */ { "Perform Mask Discovery",                           toggle },
 229                 /*  30 */ { "Mask Supplier",                                            yes_no },
 230                 /*  31 */ { "Perform Router Discover",                          toggle },
 231                 /*  32 */ { "Router Solicitation Address",                      ipv4 },
 232                 /*  33 */ { "Static Route",                                                     special },
 233                 /*  34 */ { "Trailer Encapsulation",                            toggle },
 234                 /*  35 */ { "ARP Cache Timeout",                                        time_in_secs },
 235                 /*  36 */ { "Ethernet Encapsulation",                           toggle },
 236                 /*  37 */ { "TCP Default TTL",                                          val_u_byte },
 237                 /*  38 */ { "TCP Keepalive Interval",                           time_in_secs },
 238                 /*  39 */ { "TCP Keepalive Garbage",                            toggle },
 239                 /*  40 */ { "Network Information Service Domain",       string },
 240                 /*  41 */ { "Network Information Service Servers",      ipv4 },
 241                 /*  42 */ { "Network Time Protocol Servers",            ipv4 },
 242                 /*  43 */ { "Vendor-Specific Information",                      special },
 243                 /*  44 */ { "NetBIOS over TCP/IP Name Server",          ipv4 },
 244                 /*  45 */ { "NetBIOS over TCP/IP Datagram Distribution Name Server", ipv4 },
 245                 /*  46 */ { "NetBIOS over TCP/IP Node Type",            special },
 246                 /*  47 */ { "NetBIOS over TCP/IP Scope",                        string },
 247                 /*  48 */ { "X Window System Font Server",                      ipv4 },
 248                 /*  49 */ { "X Window System Display Manager",          ipv4 },
 249                 /*  50 */ { "Requested IP Address",                                     ipv4 },
 250                 /*  51 */ { "IP Address Lease Time",                            time_in_secs },
 251                 /*  52 */ { "Option Overload",                                          special },
 252                 /*  53 */ { "DHCP Message Type",                                        special },
 253                 /*  54 */ { "Server Identifier",                                        ipv4 },
 254                 /*  55 */ { "Parameter Request List",                           special },
 255                 /*  56 */ { "Message",                                                          string },
 256                 /*  57 */ { "Maximum DHCP Message Size",                        val_u_short },
 257                 /*  58 */ { "Renewal Time Value",                                       time_in_secs },
 258                 /*  59 */ { "Rebinding Time Value",                                     time_in_secs },
 259                 /*  60 */ { "Vendor class identifier",                          special },
 260                 /*  61 */ { "Client identifier",                                        special },
 261                 /*  62 */ { "Novell/Netware IP domain",                                 string },
 262                 /*  63 */ { "Novell Options",   special },
 263                 /*  64 */ { "Network Information Service+ Domain",      string },
 264                 /*  65 */ { "Network Information Service+ Servers",     ipv4 },
 265                 /*  66 */ { "TFTP Server Name",                                         string },
 266                 /*  67 */ { "Bootfile name",                                            string },
 267                 /*  68 */ { "Mobile IP Home Agent",                                     ipv4 },
 268                 /*  69 */ { "SMTP Server",                                                      ipv4 },
 269                 /*  70 */ { "POP3 Server",                                                      ipv4 },
 270                 /*  71 */ { "NNTP Server",                                                      ipv4 },
 271                 /*  72 */ { "Default WWW Server",                                       ipv4 },
 272                 /*  73 */ { "Default Finger Server",                            ipv4 },
 273                 /*  74 */ { "Default IRC Server",                                       ipv4 },
 274                 /*  75 */ { "StreetTalk Server",                                        ipv4 },
 275                 /*  76 */ { "StreetTalk Directory Assistance Server", ipv4 },
 276                 /*  77 */ { "User Class Information",                           opaque },
 277                 /*  78 */ { "Directory Agent Information",                      opaque },
 278                 /*  79 */ { "Service Location Agent Scope",                     opaque },
 279                 /*  80 */ { "Naming Authority",                                         opaque },
 280                 /*  81 */ { "Client Fully Qualified Domain Name",       opaque },
 281                 /*  82 */ { "Agent Information Option",                 special },
 282                 /*  83 */ { "Unassigned",                               opaque },
 283                 /*  84 */ { "Unassigned",                               opaque },
 284                 /*  85 */ { "Novell Directory Services Servers",        opaque },
 285                 /*  86 */ { "Novell Directory Services Tree Name",      opaque },
 286                 /*  87 */ { "Novell Directory Services Context",        opaque },
 287                 /*  88 */ { "IEEE 1003.1 POSIX Timezone",                       opaque },
 288                 /*  89 */ { "Fully Qualified Domain Name",                      opaque },
 289                 /*  90 */ { "Authentication",                           special },
 290                 /*  91 */ { "Vines TCP/IP Server Option",                       opaque },
 291                 /*  92 */ { "Server Selection Option",                          opaque },
 292                 /*  93 */ { "Client System Architecture",                       opaque },
 293                 /*  94 */ { "Client Network Device Interface",          opaque },
 294                 /*  95 */ { "Lightweight Directory Access Protocol",    opaque },
 295                 /*  96 */ { "IPv6 Transitions",                                         opaque },
 296                 /*  97 */ { "UUID/GUID-based Client Identifier",        opaque },
 297                 /*  98 */ { "Open Group's User Authentication",         opaque },
 298                 /*  99 */ { "Unassigned",                                                       opaque },
 299                 /* 100 */ { "Printer Name",                                                     opaque },
 300                 /* 101 */ { "MDHCP multicast address",                          opaque },
 301                 /* 102 */ { "Removed/unassigned",                                       opaque },
 302                 /* 103 */ { "Removed/unassigned",                                       opaque },
 303                 /* 104 */ { "Removed/unassigned",                                       opaque },
 304                 /* 105 */ { "Removed/unassigned",                                       opaque },
 305                 /* 106 */ { "Removed/unassigned",                                       opaque },
 306                 /* 107 */ { "Removed/unassigned",                                       opaque },
 307                 /* 108 */ { "Swap Path Option",                                         opaque },
 308                 /* 109 */ { "Unassigned",                                                       opaque },
 309                 /* 110 */ { "IPX Compability",                                          opaque },
 310                 /* 111 */ { "Unassigned",                                                       opaque },
 311                 /* 112 */ { "Netinfo Parent Server Address",            opaque },
 312                 /* 113 */ { "Netinfo Parent Server Tag",                        opaque },
 313                 /* 114 */ { "URL",                                                                      opaque },
 314                 /* 115 */ { "DHCP Failover Protocol",                           opaque },
 315                 /* 116 */ { "DHCP Auto-Configuration",                          opaque },
 316                 /* 117 */ { "Unassigned",                                                       opaque },
 317                 /* 118 */ { "Unassigned",                                                       opaque },
 318                 /* 119 */ { "Unassigned",                                                       opaque },
 319                 /* 120 */ { "Unassigned",                                                       opaque },
 320                 /* 121 */ { "Unassigned",                                                       opaque },
 321                 /* 122 */ { "Unassigned",                                                       opaque },
 322                 /* 123 */ { "Unassigned",                                                       opaque },
 323                 /* 124 */ { "Unassigned",                                                       opaque },
 324                 /* 125 */ { "Unassigned",                                                       opaque },
 325                 /* 126 */ { "Extension",                                                        opaque },
 326                 /* 127 */ { "Extension",                                                        opaque },
 327                 /* 128 */ { "Private",                                  opaque },
 328                 /* 129 */ { "Private",                                  opaque },
 329                 /* 130 */ { "Private",                                  opaque },
 330                 /* 131 */ { "Private",                                  opaque },
 331                 /* 132 */ { "Private",                                  opaque },
 332                 /* 133 */ { "Private",                                  opaque },
 333                 /* 134 */ { "Private",                                  opaque },
 334                 /* 135 */ { "Private",                                  opaque },
 335                 /* 136 */ { "Private",                                  opaque },
 336                 /* 137 */ { "Private",                                  opaque },
 337                 /* 138 */ { "Private",                                  opaque },
 338                 /* 139 */ { "Private",                                  opaque },
 339                 /* 140 */ { "Private",                                  opaque },
 340                 /* 141 */ { "Private",                                  opaque },
 341                 /* 142 */ { "Private",                                  opaque },
 342                 /* 143 */ { "Private",                                  opaque },
 343                 /* 144 */ { "Private",                                  opaque },
 344                 /* 145 */ { "Private",                                  opaque },
 345                 /* 146 */ { "Private",                                  opaque },
 346                 /* 147 */ { "Private",                                  opaque },
 347                 /* 148 */ { "Private",                                  opaque },
 348                 /* 149 */ { "Private",                                  opaque },
 349                 /* 150 */ { "Private",                                  opaque },
 350                 /* 151 */ { "Private",                                  opaque },
 351                 /* 152 */ { "Private",                                  opaque },
 352                 /* 153 */ { "Private",                                  opaque },
 353                 /* 154 */ { "Private",                                  opaque },
 354                 /* 155 */ { "Private",                                  opaque },
 355                 /* 156 */ { "Private",                                  opaque },
 356                 /* 157 */ { "Private",                                  opaque },
 357                 /* 158 */ { "Private",                                  opaque },
 358                 /* 159 */ { "Private",                                  opaque },
 359                 /* 160 */ { "Private",                                  opaque },
 360                 /* 161 */ { "Private",                                  opaque },
 361                 /* 162 */ { "Private",                                  opaque },
 362                 /* 163 */ { "Private",                                  opaque },
 363                 /* 164 */ { "Private",                                  opaque },
 364                 /* 165 */ { "Private",                                  opaque },
 365                 /* 166 */ { "Private",                                  opaque },
 366                 /* 167 */ { "Private",                                  opaque },
 367                 /* 168 */ { "Private",                                  opaque },
 368                 /* 169 */ { "Private",                                  opaque },
 369                 /* 170 */ { "Private",                                  opaque },
 370                 /* 171 */ { "Private",                                  opaque },
 371                 /* 172 */ { "Private",                                  opaque },
 372                 /* 173 */ { "Private",                                  opaque },
 373                 /* 174 */ { "Private",                                  opaque },
 374                 /* 175 */ { "Private",                                  opaque },
 375                 /* 176 */ { "Private",                                  opaque },
 376                 /* 177 */ { "Private",                                  opaque },
 377                 /* 178 */ { "Private",                                  opaque },
 378                 /* 179 */ { "Private",                                  opaque },
 379                 /* 180 */ { "Private",                                  opaque },
 380                 /* 181 */ { "Private",                                  opaque },
 381                 /* 182 */ { "Private",                                  opaque },
 382                 /* 183 */ { "Private",                                  opaque },
 383                 /* 184 */ { "Private",                                  opaque },
 384                 /* 185 */ { "Private",                                  opaque },
 385                 /* 186 */ { "Private",                                  opaque },
 386                 /* 187 */ { "Private",                                  opaque },
 387                 /* 188 */ { "Private",                                  opaque },
 388                 /* 189 */ { "Private",                                  opaque },
 389                 /* 190 */ { "Private",                                  opaque },
 390                 /* 191 */ { "Private",                                  opaque },
 391                 /* 192 */ { "Private",                                  opaque },
 392                 /* 193 */ { "Private",                                  opaque },
 393                 /* 194 */ { "Private",                                  opaque },
 394                 /* 195 */ { "Private",                                  opaque },
 395                 /* 196 */ { "Private",                                  opaque },
 396                 /* 197 */ { "Private",                                  opaque },
 397                 /* 198 */ { "Private",                                  opaque },
 398                 /* 199 */ { "Private",                                  opaque },
 399                 /* 200 */ { "Private",                                  opaque },
 400                 /* 201 */ { "Private",                                  opaque },
 401                 /* 202 */ { "Private",                                  opaque },
 402                 /* 203 */ { "Private",                                  opaque },
 403                 /* 204 */ { "Private",                                  opaque },
 404                 /* 205 */ { "Private",                                  opaque },
 405                 /* 206 */ { "Private",                                  opaque },
 406                 /* 207 */ { "Private",                                  opaque },
 407                 /* 208 */ { "Private",                                  opaque },
 408                 /* 209 */ { "Private",                                  opaque },
 409                 /* 210 */ { "Authentication",                           special }
 410         };
 411
 412         /* Options whose length isn't "vlen + 2". */
 413         switch (code) {
 414
 415         case 0:         /* Padding */
 416                 /* check how much padding we have */
 417                 for (i = voff + 1; i < eoff; i++ ) {
 418                         if (tvb_get_guint8(tvb, i) != 0) {
 419                                 break;
 420                         }
 421                 }
 422                 i = i - voff;
 423                 if (!first_pass) {
 424                         if (bp_tree != NULL) {
 425                                 proto_tree_add_text(bp_tree, tvb, voff, i,
 426                                     "Padding");
 427                         }
 428                 }
 429                 consumed = i;
 430                 return consumed;
 431                 break;
 432
 433         case 255:       /* End Option */
 434                 if (!first_pass) {
 435                         if (bp_tree != NULL) {
 436                                 proto_tree_add_text(bp_tree, tvb, voff, 1,
 437                                     "End Option");
 438                         }
 439                 }
 440                 *at_end = TRUE;
 441                 consumed = 1;
 442                 return consumed;
 443         }
 444
 445         /*
 446          * Get the length of the option, and the number of bytes it
 447          * consumes (the length doesn't include the option code or
 448          * length bytes).
 449          *
 450          * On the first pass, check first whether we have the length
 451          * byte, so that we don't throw an exception; if we throw an
 452          * exception in the first pass, which is only checking for options
 453          * whose values we need in order to properly dissect the packet
 454          * on the second pass, we won't actually dissect the options, so
 455          * you won't be able to see which option had the problem.
 456          */
 457         if (first_pass) {
 458                 if (!tvb_bytes_exist(tvb, voff+1, 1)) {
 459                         /*
 460                          * We don't have the length byte; just return 1
 461                          * as the number of bytes we consumed, to count
 462                          * the code byte.
 463                          */
 464                         return 1;
 465                 }
 466         }
 467         vlen = tvb_get_guint8(tvb, voff+1);
 468         consumed = vlen + 2;
 469
 470         /*
 471          * In the first pass, we don't put anything into the protocol
 472          * tree; we just check for some options we have to look at
 473          * in order to properly process the packet:
 474          *
 475          *      53 (DHCP message type) - if this is present, this is DHCP
 476          *
 477          *      60 (Vendor class identifier) - we need this in order to
 478          *         interpret the vendor-specific info
 479          *
 480          * We also check, before fetching anything, to make sure we
 481          * have the entire item we're fetching, so that we don't throw
 482          * an exception.
 483          */
 484         if (first_pass) {
 485                 if (tvb_bytes_exist(tvb, voff+2, consumed-2)) {
 486                         switch (code) {
 487
 488                         case 53:
 489                                 *dhcp_type_p =
 490                                     get_dhcp_type(tvb_get_guint8(tvb, voff+2));
 491                                 break;
 492
 493                         case 60:
 494                                 *vendor_class_id_p =
 495                                     tvb_get_ptr(tvb, voff+2, consumed-2);
 496                                 break;
 497                         }
 498                 }
 499
 500                 /*
 501                  * We don't do anything else here.
 502                  */
 503                 return consumed;
 504         }
 505
 506         /*
 507          * This is the second pass - if there's a protocol tree to be
 508          * built, we put stuff into it, otherwise we just return.
 509          */
 510         if (bp_tree == NULL) {
 511                 /* Don't put anything in the protocol tree. */
 512                 return consumed;
 513         }
 514
 515         text = opt[code].text;
 516         /* Special cases */
 517         switch (code) {
 518
 519         case 21:        /* Policy Filter */
 520                 if (vlen == 8) {
 521                         /* one IP address pair */
 522                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 523                                 "Option %d: %s = %s/%s", code, text,
 524                                 ip_to_str(tvb_get_ptr(tvb, voff+2, 4)),
 525                                 ip_to_str(tvb_get_ptr(tvb, voff+6, 4)));
 526                 } else {
 527                         /* > 1 IP address pair. Let's make a sub-tree */
 528                         vti = proto_tree_add_text(bp_tree, tvb, voff,
 529                                 consumed, "Option %d: %s", code, text);
 530                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 531                         for (i = voff + 2; i < voff + consumed; i += 8) {
 532                                 proto_tree_add_text(v_tree, tvb, i, 8, "IP Address/Mask: %s/%s",
 533                                         ip_to_str(tvb_get_ptr(tvb, i, 4)),
 534                                         ip_to_str(tvb_get_ptr(tvb, i+4, 4)));
 535                         }
 536                 }
 537                 break;
 538
 539         case 33:        /* Static Route */
 540                 if (vlen == 8) {
 541                         /* one IP address pair */
 542                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 543                                 "Option %d: %s = %s/%s", code, text,
 544                                 ip_to_str(tvb_get_ptr(tvb, voff+2, 4)),
 545                                 ip_to_str(tvb_get_ptr(tvb, voff+6, 4)));
 546                 } else {
 547                         /* > 1 IP address pair. Let's make a sub-tree */
 548                         vti = proto_tree_add_text(bp_tree, tvb, voff,
 549                                 consumed, "Option %d: %s", code, text);
 550                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 551                         for (i = voff + 2; i < voff + consumed; i += 8) {
 552                                 proto_tree_add_text(v_tree, tvb, i, 8,
 553                                         "Destination IP Address/Router: %s/%s",
 554                                         ip_to_str(tvb_get_ptr(tvb, i, 4)),
 555                                         ip_to_str(tvb_get_ptr(tvb, i+4, 4)));
 556                         }
 557                 }
 558                 break;
 559
 560         case 43:        /* Vendor-Specific Info */
 561                 /* PXE protocol 2.1 as described in the intel specs */
 562                 if (*vendor_class_id_p != NULL &&
 563                     strncmp(*vendor_class_id_p, "PXEClient", strlen("PXEClient")) == 0) {
 564                         vti = proto_tree_add_text(bp_tree, tvb, voff,
 565                                 consumed, "Option %d: %s (PXEClient)", code, text);
 566                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 567
 568                         optp = voff+2;
 569                         while (optp < voff+consumed) {
 570                                 optp = dissect_vendor_pxeclient_suboption(v_tree,
 571                                         tvb, optp);
 572                         }
 573                 } else {
 574                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 575                                 "Option %d: %s (%d bytes)", code, text, vlen);
 576                 }
 577                 break;
 578
 579         case 46:        /* NetBIOS-over-TCP/IP Node Type */
 580                 byte = tvb_get_guint8(tvb, voff+2);
 581                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 582                                 "Option %d: %s = %s", code, text,
 583                                 val_to_str(byte, nbnt_vals,
 584                                     "Unknown (0x%02x)"));
 585                 break;
 586
 587         case 52:        /* Option Overload */
 588                 byte = tvb_get_guint8(tvb, voff+2);
 589                 vti = proto_tree_add_text(bp_tree, tvb, voff, consumed,
 590                         "Option %d: %s = %s", code, text,
 591                         val_to_str(byte, opt_overload_vals,
 592                             "Unknown (0x%02x)"));
 593
 594                 /* Just in case we find an option 52 in sname or file */
 595                 if (voff > VENDOR_INFO_OFFSET && byte >= 1 && byte <= 3) {
 596                         o52tree = proto_item_add_subtree(vti, ett_bootp_option);
 597                         if (byte == 1 || byte == 3) {   /* 'file' */
 598                                 vti = proto_tree_add_text (o52tree, tvb,
 599                                         FILE_NAME_OFFSET, FILE_NAME_LEN,
 600                                         "Boot file name option overload");
 601                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 602                                 o52voff = FILE_NAME_OFFSET;
 603                                 o52eoff = FILE_NAME_OFFSET + FILE_NAME_LEN;
 604                                 o52at_end = FALSE;
 605                                 while (o52voff < o52eoff && !o52at_end) {
 606                                         o52voff += bootp_option(tvb, v_tree, o52voff,
 607                                                 o52eoff, FALSE, &o52at_end,
 608                                                 dhcp_type_p, vendor_class_id_p);
 609                                 }
 610                         }
 611                         if (byte == 2 || byte == 3) {   /* 'sname' */
 612                                 vti = proto_tree_add_text (o52tree, tvb,
 613                                         SERVER_NAME_OFFSET, SERVER_NAME_LEN,
 614                                         "Server host name option overload");
 615                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 616                                 o52voff = SERVER_NAME_OFFSET;
 617                                 o52eoff = SERVER_NAME_OFFSET + SERVER_NAME_LEN;
 618                                 o52at_end = FALSE;
 619                                 while (o52voff < o52eoff && !o52at_end) {
 620                                         o52voff += bootp_option(tvb, v_tree, o52voff,
 621                                                 o52eoff, FALSE, &o52at_end,
 622                                                 dhcp_type_p, vendor_class_id_p);
 623                                 }
 624                         }
 625                 }
 626
 627 /*              protocol = tvb_get_guint8(tvb, voff+2);
 628                 proto_tree_add_text(v_tree, tvb, voff+2, 1, "Protocol: %s (%u)",
 629                                     val_to_str(protocol, authen_protocol_vals, "Unknown"),
 630                                     protocol); */
 631                 break;
 632         case 53:        /* DHCP Message Type */
 633                 proto_tree_add_text(bp_tree, tvb, voff, 3, "Option %d: %s = DHCP %s",
 634                         code, text, get_dhcp_type(tvb_get_guint8(tvb, voff+2)));
 635                 break;
 636
 637         case 55:        /* Parameter Request List */
 638                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 639                         vlen + 2, "Option %d: %s", code, text);
 640                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 641                 for (i = 0; i < vlen; i++) {
 642                         byte = tvb_get_guint8(tvb, voff+2+i);
 643                         if (byte < NUM_OPT_INFOS) {
 644                                 proto_tree_add_text(v_tree, tvb, voff+2+i, 1, "%d = %s",
 645                                                 byte, opt[byte].text);
 646                         } else {
 647                                 proto_tree_add_text(vti, tvb, voff+2+i, 1,
 648                                         "Unknown Option Code: %d", byte);
 649                         }
 650                 }
 651                 break;
 652
 653         case 60:        /* Vendor class identifier */
 654                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 655                         "Option %d: %s = \"%.*s\"", code, text, vlen,
 656                         tvb_get_ptr(tvb, voff+2, consumed-2));
 657                 break;
 658
 659         case 61:        /* Client Identifier */
 660                 /* We *MAY* use hwtype/hwaddr. If we have 7 bytes, I'll
 661                    guess that the first is the hwtype, and the last 6
 662                    are the hw addr */
 663                 if (vlen == 7) {
 664                         guint8 htype;
 665
 666                         vti = proto_tree_add_text(bp_tree, tvb, voff,
 667                                 consumed, "Option %d: %s", code, text);
 668                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 669                         htype = tvb_get_guint8(tvb, voff+2);
 670                         proto_tree_add_text(v_tree, tvb, voff+2, 1,
 671                                 "Hardware type: %s",
 672                                 arphrdtype_to_str(htype,
 673                                         "Unknown (0x%02x)"));
 674                         proto_tree_add_text(v_tree, tvb, voff+3, 6,
 675                                 "Client hardware address: %s",
 676                                 arphrdaddr_to_str(tvb_get_ptr(tvb, voff+3, 6),
 677                                         6, htype));
 678                 } else {
 679                         /* otherwise, it's opaque data */
 680                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 681                                 "Option %d: %s (%d bytes)", code, text, vlen);
 682                 }
 683                 break;
 684
 685         case 63:        /* NetWare/IP options */
 686                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 687                     consumed, "Option %d: %s", code, text);
 688                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 689
 690                 optp = voff+2;
 691                 while (optp < voff+consumed)
 692                         optp = dissect_netware_ip_suboption(v_tree, tvb, optp);
 693                 break;
 694
 695         case 82:        /* Relay Agent Information Option */
 696                 vti = proto_tree_add_text(bp_tree, tvb, voff, consumed,
 697                                           "Option %d: %s (%d bytes)",
 698                                           code, text, vlen);
 699                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 700                 optp = voff+2;
 701                 while (optp < voff+consumed) {
 702                         optp = bootp_dhcp_decode_agent_info(v_tree, tvb, optp);
 703                 }
 704                 break;
 705
 706         case 90:        /* DHCP Authentication */
 707         case 210:       /* Was this used for authentication at one time? */
 708                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 709                         vlen + 2, "Option %d: %s", code, text);
 710                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 711
 712                 protocol = tvb_get_guint8(tvb, voff+2);
 713                 proto_tree_add_text(v_tree, tvb, voff+2, 1, "Protocol: %s (%u)",
 714                                     val_to_str(protocol, authen_protocol_vals, "Unknown"),
 715                                     protocol);
 716
 717                 algorithm = tvb_get_guint8(tvb, voff+3);
 718                 switch (protocol) {
 719
 720                 case AUTHEN_PROTO_DELAYED_AUTHEN:
 721                         proto_tree_add_text(v_tree, tvb, voff+3, 1,
 722                                     "Algorithm: %s (%u)",
 723                                     val_to_str(algorithm, authen_da_algo_vals, "Unknown"),
 724                                     algorithm);
 725                         break;
 726
 727                 default:
 728                         proto_tree_add_text(v_tree, tvb, voff+3, 1,
 729                                     "Algorithm: %u", algorithm);
 730                         break;
 731                 }
 732
 733                 rdm = tvb_get_guint8(tvb, voff+4);
 734                 proto_tree_add_text(v_tree, tvb, voff+4, 1,
 735                                     "Replay Detection Method: %s (%u)",
 736                                     val_to_str(rdm, authen_rdm_vals, "Unknown"),
 737                                     rdm);
 738
 739                 switch (rdm) {
 740
 741                 case AUTHEN_RDM_MONOTONIC_COUNTER:
 742                         proto_tree_add_text(v_tree, tvb, voff+5, 8,
 743                                     "Replay Detection Value: %s",
 744                                     u64toh(tvb_get_ptr(tvb, voff+5, 8)));
 745                         break;
 746
 747                 default:
 748                         proto_tree_add_text(v_tree, tvb, voff+5, 8,
 749                                     "Replay Detection Value: %s",
 750                                     tvb_bytes_to_str(tvb, voff+5, 8));
 751                         break;
 752                 }
 753
 754                 switch (protocol) {
 755
 756                 case AUTHEN_PROTO_DELAYED_AUTHEN:
 757                         switch (algorithm) {
 758
 759                         case AUTHEN_DELAYED_ALGO_HMAC_MD5:
 760                                 proto_tree_add_text(v_tree, tvb, voff+13, 4,
 761                                         "Secret ID: 0x%08x",
 762                                         tvb_get_ntohl(tvb, voff+13));
 763                                 proto_tree_add_text(v_tree, tvb, voff+17, 16,
 764                                         "HMAC MD5 Hash: %s",
 765                                         tvb_bytes_to_str(tvb, voff+17, 16));
 766                                 break;
 767
 768                         default:
 769                                 proto_tree_add_text(v_tree, tvb, voff+13, vlen-11,
 770                                         "Authentication Information: %s",
 771                                         tvb_bytes_to_str(tvb, voff+17, vlen-11));
 772                                 break;
 773                         }
 774                         break;
 775
 776                 default:
 777                         proto_tree_add_text(v_tree, tvb, voff+13, vlen-11,
 778                                 "Authentication Information: %s",
 779                                 tvb_bytes_to_str(tvb, voff+17, vlen-11));
 780                         break;
 781                 }
 782                 break;
 783
 784         default:        /* not special */
 785                 break;
 786         }
 787
 788         /* Normal cases */
 789         if (code < NUM_OPT_INFOS) {
 790                 text = opt[code].text;
 791                 ftype = opt[code].ftype;
 792
 793                 switch (ftype) {
 794
 795                 case special:
 796                         return consumed;
 797
 798                 case ipv4:
 799                         if (vlen == 4) {
 800                                 /* one IP address */
 801                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 802                                         "Option %d: %s = %s", code, text,
 803                                         ip_to_str(tvb_get_ptr(tvb, voff+2, 4)));
 804                         } else {
 805                                 /* > 1 IP addresses. Let's make a sub-tree */
 806                                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 807                                         consumed, "Option %d: %s", code, text);
 808                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 809                                 for (i = voff + 2; i < voff + consumed; i += 4) {
 810                                         proto_tree_add_text(v_tree, tvb, i, 4, "IP Address: %s",
 811                                                 ip_to_str(tvb_get_ptr(tvb, i, 4)));
 812                                 }
 813                         }
 814                         break;
 815
 816                 case string:
 817                         /* Fix for non null-terminated string supplied by
 818                          * John Lines <John.Lines@aeat.co.uk>
 819                          */
 820                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 821                                         "Option %d: %s = \"%.*s\"", code, text, vlen,
 822                                         tvb_get_ptr(tvb, voff+2, consumed-2));
 823                         break;
 824
 825                 case opaque:
 826                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 827                                         "Option %d: %s (%d bytes)",
 828                                         code, text, vlen);
 829                         break;
 830
 831                 case val_u_short:
 832                         if (vlen == 2) {
 833                                 /* one gushort */
 834                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 835                                                 "Option %d: %s = %d", code, text,
 836                                                 tvb_get_ntohs(tvb, voff+2));
 837                         } else {
 838                                 /* > 1 gushort */
 839                                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 840                                         consumed, "Option %d: %s", code, text);
 841                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 842                                 for (i = voff + 2; i < voff + consumed; i += 2) {
 843                                         proto_tree_add_text(v_tree, tvb, i, 4, "Value: %d",
 844                                                 tvb_get_ntohs(tvb, i));
 845                                 }
 846                         }
 847                         break;
 848
 849                 case val_u_long:
 850                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 851                                         "Option %d: %s = %d", code, text,
 852                                         tvb_get_ntohl(tvb, voff+2));
 853                         break;
 854
 855                 case val_u_byte:
 856                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 857                                         "Option %d: %s = %d", code, text,
 858                                         tvb_get_guint8(tvb, voff+2));
 859                         break;
 860
 861                 case toggle:
 862                         i = tvb_get_guint8(tvb, voff+2);
 863                         if (i != 0 && i != 1) {
 864                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 865                                                 "Option %d: %s = Invalid Value %d", code, text,
 866                                                 i);
 867                         } else {
 868                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 869                                                 "Option %d: %s = %s", code, text,
 870                                                 i == 0 ? "Disabled" : "Enabled");
 871                         }
 872                         break;
 873
 874                 case yes_no:
 875                         i = tvb_get_guint8(tvb, voff+2);
 876                         if (i != 0 && i != 1) {
 877                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 878                                                 "Option %d: %s = Invalid Value %d", code, text,
 879                                                 i);
 880                         } else {
 881                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 882                                                 "Option %d: %s = %s", code, text,
 883                                                 i == 0 ? "No" : "Yes");
 884                         }
 885                         break;
 886
 887                 case time_in_secs:
 888                         time_secs = tvb_get_ntohl(tvb, voff+2);
 889                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 890                                 "Option %d: %s = %s", code, text,
 891                                 ((time_secs == 0xffffffff) ?
 892                                     "infinity" :
 893                                     time_secs_to_str(time_secs)));
 894                         break;
 895
 896                 default:
 897                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 898                                         "Option %d: %s (%d bytes)", code, text, vlen);
 899                 }
 900         } else {
 901                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 902                                 "Unknown Option Code: %d (%d bytes)", code, vlen);
 903         }
 904
 905         return consumed;
 906 }
 907
 908 static int
 909 bootp_dhcp_decode_agent_info(proto_tree *v_tree, tvbuff_t *tvb, int optp)
 910 {
 911         guint8 subopt;
 912         guint8 subopt_len;
 913
 914         subopt = tvb_get_guint8(tvb, optp);
 915         subopt_len = tvb_get_guint8(tvb, optp+1);
 916         switch (subopt) {
 917         case 1:
 918                 proto_tree_add_text(v_tree, tvb, optp, subopt_len + 2,
 919                                     "Agent Circuit ID (%d bytes)", subopt_len);
 920                 break;
 921         case 2:
 922                 proto_tree_add_text(v_tree, tvb, optp, subopt_len + 2,
 923                                     "Agent Remote ID (%d bytes)", subopt_len);
 924                 break;
 925         default:
 926                 proto_tree_add_text(v_tree, tvb, optp, subopt_len + 2,
 927                                     "Unknown agent option: %d", subopt);
 928                 break;
 929         }
 930         optp += (subopt_len + 2);
 931         return optp;
 932 }
 933
 934 static int
 935 dissect_vendor_pxeclient_suboption(proto_tree *v_tree, tvbuff_t *tvb, int optp)
 936 {
 937         guint8 subopt;
 938         guint8 subopt_len;
 939         int slask;
 940         proto_tree *o43pxeclient_v_tree;
 941         proto_item *vti;
 942
 943         struct o43pxeclient_opt_info {
 944                 char    *text;
 945                 enum field_type ft;
 946         };
 947
 948         static struct o43pxeclient_opt_info o43pxeclient_opt[]= {
 949                 /* 0 */ {"nop", special},       /* dummy */
 950                 /* 1 */ {"PXE mtftp IP", ipv4},
 951                 /* 2 */ {"PXE mtftp client port", val_u_le_short},
 952                 /* 3 */ {"PXE mtftp server port",val_u_le_short},
 953                 /* 4 */ {"PXE mtftp timeout", val_u_byte},
 954                 /* 5 */ {"PXE mtftp delay", val_u_byte},
 955                 /* 6 */ {"PXE discovery control", val_u_byte},
 956                         /*
 957                          * Correct: b0 (lsb): disable broadcast discovery
 958                          *      b1: disable multicast discovery
 959                          *      b2: only use/accept servers in boot servers
 960                          *      b3: download bootfile without prompt/menu/disc
 961                          */
 962                 /* 7 */ {"PXE multicast address", ipv4},
 963                 /* 8 */ {"PXE boot servers", special},
 964                 /* 9 */ {"PXE boot menu", special},
 965                 /* 10 */ {"PXE menu prompt", special},
 966                 /* 11 */ {"PXE multicast address alloc", special},
 967                 /* 12 */ {"PXE credential types", special},
 968                 /* 71 {"PXE boot item", special} */
 969                 /* 255 {"PXE end options", special} */
 970         };
 971 #define NUM_O43PXECLIENT_SUBOPTS (12)
 972
 973         subopt = tvb_get_guint8(tvb, optp);
 974
 975         if (subopt == 0 ) {
 976                 proto_tree_add_text(v_tree, tvb, optp, 1, "Padding");
 977                 return (optp+1);
 978         } else if (subopt == 255) {     /* End Option */
 979                 proto_tree_add_text(v_tree, tvb, optp, 1, "End PXEClient option");
 980                 /* Make sure we skip any junk left this option */
 981                 return (optp+255);
 982         }
 983
 984         subopt_len = tvb_get_guint8(tvb, optp+1);
 985
 986         if ( subopt == 71 ) {   /* 71 {"PXE boot item", special} */
 987                 /* case special */
 988                 /* I may need to decode that properly one day */
 989                 proto_tree_add_text(v_tree, tvb, optp, subopt_len+2,
 990                         "Suboption %d: %s (%d byte%s)" ,
 991                         subopt, "PXE boot item",
 992                         subopt_len, (subopt_len != 1)?"s":"");
 993         } else if ( (subopt < 1 ) || (subopt > NUM_O43PXECLIENT_SUBOPTS) ) {
 994                 proto_tree_add_text(v_tree, tvb, optp, subopt_len+2,
 995                         "Unknown suboption %d (%d byte%s)", subopt, subopt_len,
 996                         (subopt_len != 1)?"s":"");
 997         } else {
 998                 switch (o43pxeclient_opt[subopt].ft) {
 999
1000 /* XXX          case string:
1001                         proto_tree_add_text(v_tree, tvb, optp, subopt_len+2,
1002                                 "Suboption %d: %s", subopt, o43pxeclient_opt[subopt].text);
1003                         break;
1004    XXX */
1005                 case special:
1006                         /* I may need to decode that properly one day */
1007                         proto_tree_add_text(v_tree, tvb, optp, subopt_len+2,
1008                                 "Suboption %d: %s (%d byte%s)" ,
1009                                 subopt, o43pxeclient_opt[subopt].text,
1010                                 subopt_len, (subopt_len != 1)?"s":"");
1011                         break;
1012
1013                 case val_u_le_short:
1014                         proto_tree_add_text(v_tree, tvb, optp, 4, "Suboption %d: %s = %u",
1015                             subopt, o43pxeclient_opt[subopt].text,
1016                             tvb_get_letohs(tvb, optp+2));
1017                         break;
1018
1019                 case val_u_byte:
1020                         proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s = %u",
1021                             subopt, o43pxeclient_opt[subopt].text,
1022                             tvb_get_guint8(tvb, optp+2));
1023                         break;
1024
1025                 case ipv4:
1026                         if (subopt_len == 4) {
1027                                 /* one IP address */
1028                                 proto_tree_add_text(v_tree, tvb, optp, 6,
1029                                     "Suboption %d : %s = %s",
1030                                     subopt, o43pxeclient_opt[subopt].text,
1031                                     ip_to_str(tvb_get_ptr(tvb, optp+2, 4)));
1032                         } else {
1033                                 /* > 1 IP addresses. Let's make a sub-tree */
1034                                 vti = proto_tree_add_text(v_tree, tvb, optp,
1035                                     subopt_len+2, "Suboption %d: %s",
1036                                     subopt, o43pxeclient_opt[subopt].text);
1037                                 o43pxeclient_v_tree = proto_item_add_subtree(vti, ett_bootp_option);
1038                                 for (slask = optp + 2 ; slask < optp+subopt_len; slask += 4) {
1039                                         proto_tree_add_text(o43pxeclient_v_tree, tvb, slask, 4, "IP Address: %s",
1040                                             ip_to_str(tvb_get_ptr(tvb, slask, 4)));
1041                                 }
1042                         }
1043                         break;
1044                 default:
1045                         proto_tree_add_text(v_tree, tvb, optp, subopt_len+2,"ERROR, please report: Unknown subopt type handler %d", subopt);
1046                         break;
1047                 }
1048         }
1049         optp += (subopt_len + 2);
1050         return optp;
1051 }
1052
1053 static int
1054 dissect_netware_ip_suboption(proto_tree *v_tree, tvbuff_t *tvb, int optp)
1055 {
1056         guint8 subopt;
1057         guint8 subopt_len;
1058         int slask;
1059         proto_tree *o63_v_tree;
1060         proto_item *vti;
1061
1062         struct o63_opt_info {
1063                 char    *truet;
1064                 char    *falset;
1065                 enum field_type ft;
1066         };
1067
1068         static struct o63_opt_info o63_opt[]= {
1069                 /* 0 */ {"","",none},
1070                 /* 1 */ {"NWIP does not exist on subnet","",string},
1071                 /* 2 */ {"NWIP exist in options area","",string},
1072                 /* 3 */ {"NWIP exists in sname/file","",string},
1073                 /* 4 */ {"NWIP exists, but too big","",string},
1074                 /* 5 */ {"Broadcast for nearest Netware server","Do NOT Broadcast for nearest Netware server",yes_no},
1075                 /* 6 */ {"Preferred DSS server","",ipv4},
1076                 /* 7 */ {"Nearest NWIP server","",ipv4},
1077                 /* 8 */ {"Autoretries","",val_u_short},
1078                 /* 9 */ {"Autoretry delay, secs ","",val_u_short},
1079                 /* 10*/ {"Support NetWare/IP v1.1","Do NOT support NetWare/IP v1.1",yes_no},
1080                 /* 11*/ {"Primary DSS ", "" , special}
1081         };
1082
1083         subopt = tvb_get_guint8(tvb, optp);
1084         if (subopt > NUM_O63_SUBOPTS) {
1085                 proto_tree_add_text(v_tree, tvb,optp,1,"Unknown suboption %d", subopt);
1086                 optp++;
1087         } else {
1088                 switch (o63_opt[subopt].ft) {
1089
1090                 case string:
1091                         proto_tree_add_text(v_tree, tvb, optp, 2, "Suboption %d: %s", subopt, o63_opt[subopt].truet);
1092                         optp+=2;
1093                         break;
1094
1095                 case yes_no:
1096                         if (tvb_get_guint8(tvb, optp+2)==1) {
1097                                 proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s", subopt, o63_opt[subopt].truet);
1098                         } else {
1099                                 proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s" , subopt, o63_opt[subopt].falset);
1100                         }
1101                         optp+=3;
1102                         break;
1103
1104                 case special:
1105                         proto_tree_add_text(v_tree, tvb, optp, 6,
1106                             "Suboption %d: %s = %s" ,
1107                             subopt, o63_opt[subopt].truet,
1108                             ip_to_str(tvb_get_ptr(tvb, optp+2, 4)));
1109                         optp=optp+6;
1110                         break;
1111
1112                 case val_u_short:
1113                         proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s = %u",
1114                             subopt, o63_opt[subopt].truet,
1115                             tvb_get_guint8(tvb, optp+2));       /* XXX - 1 byte? */
1116                         optp+=3;
1117                         break;
1118
1119                 case ipv4:
1120                         subopt_len = tvb_get_guint8(tvb, optp+1);
1121                         if (subopt_len == 4) {
1122                                 /* one IP address */
1123                                 proto_tree_add_text(v_tree, tvb, optp, 6,
1124                                     "Suboption %d : %s = %s",
1125                                     subopt, o63_opt[subopt].truet,
1126                                     ip_to_str(tvb_get_ptr(tvb, optp+2, 4)));
1127                                 optp=optp+6;
1128                         } else {
1129                                 /* > 1 IP addresses. Let's make a sub-tree */
1130                                 vti = proto_tree_add_text(v_tree, tvb, optp,
1131                                     subopt_len+2, "Suboption %d: %s",
1132                                     subopt, o63_opt[subopt].truet);
1133                                 o63_v_tree = proto_item_add_subtree(vti, ett_bootp_option);
1134                                 for (slask = optp + 2 ; slask < optp+subopt_len; slask += 4) {
1135                                         proto_tree_add_text(o63_v_tree, tvb, slask, 4, "IP Address: %s",
1136                                             ip_to_str(tvb_get_ptr(tvb, slask, 4)));
1137                                 }
1138                                 optp=slask;
1139                         }
1140                         break;
1141                 default:
1142                         proto_tree_add_text(v_tree, tvb,optp,1,"Unknown suboption %d", subopt);
1143                         optp++;
1144                         break;
1145                 }
1146         }
1147         return optp;
1148 }
1149
1150 #define BOOTREQUEST     1
1151 #define BOOTREPLY       2
1152
1153 static const value_string op_vals[] = {
1154         { BOOTREQUEST,  "Boot Request" },
1155         { BOOTREPLY,    "Boot Reply" },
1156         { 0,            NULL }
1157 };
1158
1159 static void
1160 dissect_bootp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1161 {
1162         proto_tree      *bp_tree = NULL;
1163         proto_item      *ti;
1164         proto_tree      *flag_tree = NULL;
1165         proto_item      *fi;
1166         guint8          op;
1167         guint8          htype, hlen;
1168         const guint8    *haddr;
1169         int             voff, eoff, tmpvoff; /* vendor offset, end offset */
1170         guint32         ip_addr;
1171         gboolean        at_end;
1172         const char      *dhcp_type = NULL;
1173         const guint8    *vendor_class_id = NULL;
1174         guint16         flags;
1175
1176         if (check_col(pinfo->cinfo, COL_PROTOCOL))
1177                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "BOOTP");
1178         if (check_col(pinfo->cinfo, COL_INFO)) {
1179                 /*
1180                  * In case we throw an exception fetching the opcode, etc.
1181                  */
1182                 col_clear(pinfo->cinfo, COL_INFO);
1183         }
1184
1185         op = tvb_get_guint8(tvb, 0);
1186         htype = tvb_get_guint8(tvb, 1);
1187         hlen = tvb_get_guint8(tvb, 2);
1188         if (check_col(pinfo->cinfo, COL_INFO)) {
1189                 switch (op) {
1190
1191                 case BOOTREQUEST:
1192                         col_add_fstr(pinfo->cinfo, COL_INFO, "Boot Request from %s",
1193                                 arphrdaddr_to_str(tvb_get_ptr(tvb, 28, hlen),
1194                                         hlen, htype));
1195                         break;
1196
1197                 case BOOTREPLY:
1198                         col_set_str(pinfo->cinfo, COL_INFO, "Boot Reply");
1199                         break;
1200
1201                 default:
1202                         col_add_fstr(pinfo->cinfo, COL_INFO, "Unknown BOOTP message type (%u)",
1203                             op);
1204                         break;
1205                 }
1206         }
1207
1208         if (tree) {
1209                 ti = proto_tree_add_item(tree, proto_bootp, tvb, 0, -1, FALSE);
1210                 bp_tree = proto_item_add_subtree(ti, ett_bootp);
1211
1212                 proto_tree_add_uint(bp_tree, hf_bootp_type, tvb,
1213                                            0, 1,
1214                                            op);
1215                 proto_tree_add_uint_format(bp_tree, hf_bootp_hw_type, tvb,
1216                                            1, 1,
1217                                            htype,
1218                                            "Hardware type: %s",
1219                                            arphrdtype_to_str(htype,
1220                                                              "Unknown (0x%02x)"));
1221                 proto_tree_add_uint(bp_tree, hf_bootp_hw_len, tvb,
1222                                     2, 1, hlen);
1223                 proto_tree_add_item(bp_tree, hf_bootp_hops, tvb,
1224                                     3, 1, FALSE);
1225                 proto_tree_add_item(bp_tree, hf_bootp_id, tvb,
1226                                     4, 4, FALSE);
1227                 proto_tree_add_item(bp_tree, hf_bootp_secs, tvb,
1228                                     8, 2, FALSE);
1229                 flags = tvb_get_ntohs(tvb, 10);
1230                 fi = proto_tree_add_uint(bp_tree, hf_bootp_flags, tvb,
1231                                     10, 2, flags);
1232                 proto_item_append_text(fi, " (%s)",
1233                     (flags & BOOTP_BC) ? "Broadcast" : "Unicast");
1234                 flag_tree = proto_item_add_subtree(fi, ett_bootp_flags);
1235                 proto_tree_add_boolean(flag_tree, hf_bootp_flags_broadcast, tvb,
1236                                     10, 2, flags);
1237                 proto_tree_add_uint(flag_tree, hf_bootp_flags_reserved, tvb,
1238                                     10, 2, flags);
1239                 proto_tree_add_item(bp_tree, hf_bootp_ip_client, tvb,
1240                                     12, 4, FALSE);
1241                 proto_tree_add_item(bp_tree, hf_bootp_ip_your, tvb,
1242                                     16, 4, FALSE);
1243                 proto_tree_add_item(bp_tree, hf_bootp_ip_server, tvb,
1244                                     20, 4, FALSE);
1245                 proto_tree_add_item(bp_tree, hf_bootp_ip_relay, tvb,
1246                                     24, 4, FALSE);
1247
1248                 if (hlen > 0) {
1249                         haddr = tvb_get_ptr(tvb, 28, hlen);
1250                         proto_tree_add_bytes_format(bp_tree, hf_bootp_hw_addr, tvb,
1251                                                    28, hlen,
1252                                                    haddr,
1253                                                    "Client hardware address: %s",
1254                                                    arphrdaddr_to_str(haddr,
1255                                                                      hlen,
1256                                                                      htype));
1257                 }
1258                 else {
1259                         proto_tree_add_text(bp_tree,  tvb,
1260                                                    28, 0, "Client address not given");
1261                 }
1262
1263                 /* The server host name is optional */
1264                 if (tvb_get_guint8(tvb, 44) != '\0') {
1265                         proto_tree_add_item(bp_tree, hf_bootp_server, tvb,
1266                                                    SERVER_NAME_OFFSET,
1267                                                    SERVER_NAME_LEN, FALSE);
1268                 }
1269                 else {
1270                         proto_tree_add_string_format(bp_tree, hf_bootp_server, tvb,
1271                                                    SERVER_NAME_OFFSET,
1272                                                    SERVER_NAME_LEN,
1273                                                    tvb_get_ptr(tvb, SERVER_NAME_OFFSET, 1),
1274                                                    "Server host name not given");
1275                 }
1276
1277                 /* Boot file */
1278                 if (tvb_get_guint8(tvb, 108) != '\0') {
1279                         proto_tree_add_item(bp_tree, hf_bootp_file, tvb,
1280                                                    FILE_NAME_OFFSET,
1281                                                    FILE_NAME_LEN, FALSE);
1282                 }
1283                 else {
1284                         proto_tree_add_string_format(bp_tree, hf_bootp_file, tvb,
1285                                                    FILE_NAME_OFFSET,
1286                                                    FILE_NAME_LEN,
1287                                                    tvb_get_ptr(tvb, FILE_NAME_OFFSET, 1),
1288                                                    "Boot file name not given");
1289                 }
1290         }
1291
1292         voff = VENDOR_INFO_OFFSET;
1293
1294         /* rfc2132 says it SHOULD exist, not that it MUST exist */
1295         if (tvb_bytes_exist(tvb, voff, 4)) {
1296                 if (tvb_get_ntohl(tvb, voff) == 0x63825363) {
1297                         if (tree) {
1298                                 tvb_memcpy(tvb, (void *)&ip_addr, voff, sizeof(ip_addr));
1299                                 proto_tree_add_ipv4_format(bp_tree, hf_bootp_cookie, tvb,
1300                                     voff, 4, ip_addr,
1301                                     "Magic cookie: (OK)");
1302                         }
1303                         voff += 4;
1304                 }
1305                 else {
1306                         if (tree) {
1307                                 proto_tree_add_text(bp_tree,  tvb,
1308                                         voff, 64, "Bootp vendor specific options");
1309                         }
1310                         voff += 64;
1311                 }
1312         }
1313
1314         eoff = tvb_reported_length(tvb);
1315
1316         /*
1317          * In the first pass, we just look for the DHCP message type
1318          * and Vendor class identifier options.
1319          */
1320         tmpvoff = voff;
1321         at_end = FALSE;
1322         while (tmpvoff < eoff && !at_end) {
1323                 tmpvoff += bootp_option(tvb, 0, tmpvoff, eoff, TRUE, &at_end,
1324                     &dhcp_type, &vendor_class_id);
1325         }
1326
1327         /*
1328          * If there was a DHCP message type option, flag this packet
1329          * as DHCP.
1330          */
1331         if (dhcp_type != NULL) {
1332                 /*
1333                  * Yes, this is a DHCP packet, and "dhcp_type" is the
1334                  * packet type.
1335                  */
1336                 if (check_col(pinfo->cinfo, COL_PROTOCOL))
1337                         col_set_str(pinfo->cinfo, COL_PROTOCOL, "DHCP");
1338                 if (check_col(pinfo->cinfo, COL_INFO))
1339                         col_add_fstr(pinfo->cinfo, COL_INFO, "DHCP %-8s - Transaction ID 0x%x",
1340                             dhcp_type, tvb_get_ntohl(tvb, 4));
1341                 if (tree)
1342                         proto_tree_add_boolean_hidden(bp_tree, hf_bootp_dhcp,
1343                             tvb, 0, 0, 1);
1344         }
1345
1346         /*
1347          * If we're not building the protocol tree, we don't need to
1348          * make a second pass.
1349          */
1350         if (tree == NULL)
1351                 return;
1352
1353         /*
1354          * OK, now build the protocol tree.
1355          */
1356         at_end = FALSE;
1357         while (voff < eoff && !at_end) {
1358                 voff += bootp_option(tvb, bp_tree, voff, eoff, FALSE, &at_end,
1359                     &dhcp_type, &vendor_class_id);
1360         }
1361         if (voff < eoff) {
1362                 /*
1363                  * Padding after the end option.
1364                  */
1365                 proto_tree_add_text(bp_tree, tvb, voff, eoff - voff, "Padding");
1366         }
1367 }
1368
1369 void
1370 proto_register_bootp(void)
1371 {
1372   static hf_register_info hf[] = {
1373     { &hf_bootp_dhcp,
1374       { "Frame is DHCP",                "bootp.dhcp",    FT_BOOLEAN,
1375         BASE_NONE,                      NULL,            0x0,
1376         "", HFILL }},
1377
1378     { &hf_bootp_type,
1379       { "Message type",                 "bootp.type",    FT_UINT8,
1380          BASE_DEC,                      VALS(op_vals),   0x0,
1381         "", HFILL }},
1382
1383     { &hf_bootp_hw_type,
1384       { "Hardware type",                "bootp.hw.type", FT_UINT8,
1385         BASE_HEX,                       NULL,            0x0,
1386         "", HFILL }},
1387
1388     { &hf_bootp_hw_len,
1389       { "Hardware address length",      "bootp.hw.len",  FT_UINT8,
1390         BASE_DEC,                       NULL,            0x0,
1391         "", HFILL }},
1392
1393     { &hf_bootp_hops,
1394       { "Hops",                         "bootp.hops",    FT_UINT8,
1395         BASE_DEC,                       NULL,            0x0,
1396         "", HFILL }},
1397
1398     { &hf_bootp_id,
1399       { "Transaction ID",               "bootp.id",      FT_UINT32,
1400         BASE_HEX,                        NULL,           0x0,
1401         "", HFILL }},
1402
1403     { &hf_bootp_secs,
1404       { "Seconds elapsed",              "bootp.secs",    FT_UINT16,
1405         BASE_DEC,                        NULL,           0x0,
1406         "", HFILL }},
1407
1408     { &hf_bootp_flags,
1409       { "Bootp flags",                  "bootp.flags",   FT_UINT16,
1410         BASE_HEX,                       NULL,            0x0,
1411         "", HFILL }},
1412
1413     { &hf_bootp_flags_broadcast,
1414       { "Broadcast flag",               "bootp.flags.bc", FT_BOOLEAN,
1415         16,                     TFS(&flag_set_broadcast), BOOTP_BC,
1416         "", HFILL }},
1417
1418     { &hf_bootp_flags_reserved,
1419       { "Reserved flags",               "bootp.flags.reserved", FT_UINT16,
1420         BASE_HEX,                       NULL,           BOOTP_MBZ,
1421         "", HFILL }},
1422
1423     { &hf_bootp_ip_client,
1424       { "Client IP address",            "bootp.ip.client",FT_IPv4,
1425         BASE_NONE,                      NULL,             0x0,
1426         "", HFILL }},
1427
1428     { &hf_bootp_ip_your,
1429       { "Your (client) IP address",     "bootp.ip.your",  FT_IPv4,
1430         BASE_NONE,                      NULL,             0x0,
1431         "", HFILL }},
1432
1433     { &hf_bootp_ip_server,
1434       { "Next server IP address",       "bootp.ip.server",FT_IPv4,
1435         BASE_NONE,                      NULL,             0x0,
1436         "", HFILL }},
1437
1438     { &hf_bootp_ip_relay,
1439       { "Relay agent IP address",       "bootp.ip.relay", FT_IPv4,
1440         BASE_NONE,                      NULL,             0x0,
1441         "", HFILL }},
1442
1443     { &hf_bootp_hw_addr,
1444       { "Client hardware address",      "bootp.hw.addr", FT_BYTES,
1445         BASE_NONE,                      NULL,            0x0,
1446         "", HFILL }},
1447
1448     { &hf_bootp_server,
1449       { "Server host name",             "bootp.server",  FT_STRING,
1450         BASE_NONE,                      NULL,            0x0,
1451         "", HFILL }},
1452
1453     { &hf_bootp_file,
1454       { "Boot file name",               "bootp.file",    FT_STRING,
1455         BASE_NONE,                      NULL,            0x0,
1456         "", HFILL }},
1457
1458     { &hf_bootp_cookie,
1459       { "Magic cookie",                 "bootp.cookie",  FT_IPv4,
1460          BASE_NONE,                     NULL,            0x0,
1461         "", HFILL }},
1462
1463     { &hf_bootp_vendor,
1464       { "Bootp Vendor Options",         "bootp.vendor", FT_BYTES,
1465         BASE_NONE,                      NULL,            0x0,
1466         "", HFILL }},
1467   };
1468   static gint *ett[] = {
1469     &ett_bootp,
1470     &ett_bootp_flags,
1471     &ett_bootp_option,
1472   };
1473
1474   proto_bootp = proto_register_protocol("Bootstrap Protocol", "BOOTP/DHCP",
1475                                         "bootp");
1476   proto_register_field_array(proto_bootp, hf, array_length(hf));
1477   proto_register_subtree_array(ett, array_length(ett));
1478 }
1479
1480 void
1481 proto_reg_handoff_bootp(void)
1482 {
1483   dissector_handle_t bootp_handle;
1484
1485   bootp_handle = create_dissector_handle(dissect_bootp, proto_bootp);
1486   dissector_add("udp.port", UDP_PORT_BOOTPS, bootp_handle);
1487   dissector_add("udp.port", UDP_PORT_BOOTPC, bootp_handle);
1488 }