packet-bootp.c

   1 /* packet-bootp.c
   2  * Routines for BOOTP/DHCP packet disassembly
   3  * Gilbert Ramirez <gram@xiexie.org>
   4  *
   5  * $Id: packet-bootp.c,v 1.44 2001/01/03 22:49:06 guy Exp $
   6  *
   7  * The information used comes from:
   8  * RFC  951: Bootstrap Protocol
   9  * RFC 1542: Clarifications and Extensions for the Bootstrap Protocol
  10  * RFC 2131: Dynamic Host Configuration Protocol
  11  * RFC 2132: DHCP Options and BOOTP Vendor Extensions
  12  * RFC 2489: Procedure for Defining New DHCP Options
  13  * BOOTP and DHCP Parameters
  14  *     http://www.isi.edu/in-notes/iana/assignments/bootp-dhcp-parameters
  15  *
  16  * Ethereal - Network traffic analyzer
  17  * By Gerald Combs <gerald@zing.org>
  18  * Copyright 1998 Gerald Combs
  19  *
  20  *
  21  * This program is free software; you can redistribute it and/or
  22  * modify it under the terms of the GNU General Public License
  23  * as published by the Free Software Foundation; either version 2
  24  * of the License, or (at your option) any later version.
  25  *
  26  * This program is distributed in the hope that it will be useful,
  27  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  28  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  29  * GNU General Public License for more details.
  30  *
  31  * You should have received a copy of the GNU General Public License
  32  * along with this program; if not, write to the Free Software
  33  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  34  */
  35
  36 #ifdef HAVE_CONFIG_H
  37 # include "config.h"
  38 #endif
  39
  40 #ifdef HAVE_SYS_TYPES_H
  41 # include <sys/types.h>
  42 #endif
  43
  44 #include <string.h>
  45 #include <glib.h>
  46 #include "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_flag = -1;
  57 static int hf_bootp_ip_client = -1;
  58 static int hf_bootp_ip_your = -1;
  59 static int hf_bootp_ip_server = -1;
  60 static int hf_bootp_ip_relay = -1;
  61 static int hf_bootp_hw_addr = -1;
  62 static int hf_bootp_server = -1;
  63 static int hf_bootp_file = -1;
  64 static int hf_bootp_cookie = -1;
  65 static int hf_bootp_dhcp = -1;
  66
  67 static guint ett_bootp = -1;
  68 static guint ett_bootp_option = -1;
  69
  70 #define UDP_PORT_BOOTPS  67
  71
  72 enum field_type { none, ipv4, string, toggle, yes_no, special, opaque,
  73         time_in_secs,
  74         val_u_byte, val_u_short, val_u_long,
  75         val_s_long };
  76
  77 struct opt_info {
  78         char    *text;
  79         enum field_type ftype;
  80 };
  81
  82 #define NUM_OPT_INFOS 128
  83 #define NUM_O63_SUBOPTS 11
  84
  85 static int dissect_netware_ip_suboption(proto_tree *v_tree, tvbuff_t *tvb,
  86     int optp);
  87
  88 static const char *
  89 get_dhcp_type(guint8 byte)
  90 {
  91         static const char       *opt53_text[] = {
  92                 "Unknown Message Type",
  93                 "Discover",
  94                 "Offer",
  95                 "Request",
  96                 "Decline",
  97                 "ACK",
  98                 "NAK",
  99                 "Release",
 100                 "Inform"
 101         };
 102         int i;
 103
 104         if (byte > 0 && byte < (sizeof opt53_text / sizeof opt53_text[0]))
 105                 i = byte;
 106         else
 107                 i = 0;
 108         return opt53_text[i];
 109 }
 110
 111 /* Returns the number of bytes consumed by this option. */
 112 static int
 113 bootp_option(tvbuff_t *tvb, proto_tree *bp_tree, int voff, int eoff)
 114 {
 115         char                    *text;
 116         enum field_type         ftype;
 117         u_char                  code = tvb_get_guint8(tvb, voff);
 118         int                     vlen;
 119         u_char                  byte;
 120         int                     i,optp, consumed;
 121         u_long                  time_secs;
 122         proto_tree              *v_tree;
 123         proto_item              *vti;
 124
 125         static const value_string nbnt_vals[] = {
 126             {0x1,   "B-node" },
 127             {0x2,   "P-node" },
 128             {0x4,   "M-node" },
 129             {0x8,   "H-node" },
 130             {0,     NULL     } };
 131
 132         static struct opt_info opt[] = {
 133                 /*   0 */ { "Padding",                                                          none },
 134                 /*   1 */ { "Subnet Mask",                                                      ipv4 },
 135                 /*   2 */ { "Time Offset",                                                      val_s_long },
 136                 /*   3 */ { "Router",                                                           ipv4 },
 137                 /*   4 */ { "Time Server",                                                      ipv4 },
 138                 /*   5 */ { "Name Server",                                                      ipv4 },
 139                 /*   6 */ { "Domain Name Server",                                       ipv4 },
 140                 /*   7 */ { "Log Server",                                                       ipv4 },
 141                 /*   8 */ { "Cookie Server",                                            ipv4 },
 142                 /*   9 */ { "LPR Server",                                                       ipv4 },
 143                 /*  10 */ { "Impress Server",                                           ipv4 },
 144                 /*  11 */ { "Resource Location Server",                         ipv4 },
 145                 /*  12 */ { "Host Name",                                                        string },
 146                 /*  13 */ { "Boot File Size",                                           val_u_short },
 147                 /*  14 */ { "Merit Dump File",                                          string },
 148                 /*  15 */ { "Domain Name",                                                      string },
 149                 /*  16 */ { "Swap Server",                                                      ipv4 },
 150                 /*  17 */ { "Root Path",                                                        string },
 151                 /*  18 */ { "Extensions Path",                                          string },
 152                 /*  19 */ { "IP Forwarding",                                            toggle },
 153                 /*  20 */ { "Non-Local Source Routing",                         toggle },
 154                 /*  21 */ { "Policy Filter",                                            special },
 155                 /*  22 */ { "Maximum Datagram Reassembly Size",         val_u_short },
 156                 /*  23 */ { "Default IP Time-to-Live",                          val_u_byte },
 157                 /*  24 */ { "Path MTU Aging Timeout",                           time_in_secs },
 158                 /*  25 */ { "Path MTU Plateau Table",                           val_u_short },
 159                 /*  26 */ { "Interface MTU",                                            val_u_short },
 160                 /*  27 */ { "All Subnets are Local",                            yes_no },
 161                 /*  28 */ { "Broadcast Address",                                        ipv4 },
 162                 /*  29 */ { "Perform Mask Discovery",                           toggle },
 163                 /*  30 */ { "Mask Supplier",                                            yes_no },
 164                 /*  31 */ { "Perform Router Discover",                          toggle },
 165                 /*  32 */ { "Router Solicitation Address",                      ipv4 },
 166                 /*  33 */ { "Static Route",                                                     special },
 167                 /*  34 */ { "Trailer Encapsulation",                            toggle },
 168                 /*  35 */ { "ARP Cache Timeout",                                        time_in_secs },
 169                 /*  36 */ { "Ethernet Encapsulation",                           toggle },
 170                 /*  37 */ { "TCP Default TTL",                                          val_u_byte },
 171                 /*  38 */ { "TCP Keepalive Interval",                           time_in_secs },
 172                 /*  39 */ { "TCP Keepalive Garbage",                            toggle },
 173                 /*  40 */ { "Network Information Service Domain",       string },
 174                 /*  41 */ { "Network Information Service Servers",      ipv4 },
 175                 /*  42 */ { "Network Time Protocol Servers",            ipv4 },
 176                 /*  43 */ { "Vendor-Specific Information",                      special },
 177                 /*  44 */ { "NetBIOS over TCP/IP Name Server",          ipv4 },
 178                 /*  45 */ { "NetBIOS over TCP/IP Datagram Distribution Name Server", ipv4 },
 179                 /*  46 */ { "NetBIOS over TCP/IP Node Type",            special },
 180                 /*  47 */ { "NetBIOS over TCP/IP Scope",                        string },
 181                 /*  48 */ { "X Window System Font Server",                      ipv4 },
 182                 /*  49 */ { "X Window System Display Manager",          ipv4 },
 183                 /*  50 */ { "Requested IP Address",                                     ipv4 },
 184                 /*  51 */ { "IP Address Lease Time",                            time_in_secs },
 185                 /*  52 */ { "Option Overload",                                          special },
 186                 /*  53 */ { "DHCP Message Type",                                        special },
 187                 /*  54 */ { "Server Identifier",                                        ipv4 },
 188                 /*  55 */ { "Parameter Request List",                           special },
 189                 /*  56 */ { "Message",                                                          string },
 190                 /*  57 */ { "Maximum DHCP Message Size",                        val_u_short },
 191                 /*  58 */ { "Renewal Time Value",                                       time_in_secs },
 192                 /*  59 */ { "Rebinding Time Value",                                     time_in_secs },
 193                 /*  60 */ { "Vendor class identifier",                          opaque },
 194                 /*  61 */ { "Client identifier",                                        special },
 195                 /*  62 */ { "Novell/Netware IP domain",                                 string },
 196                 /*  63 */ { "Novell Options",   special },
 197                 /*  64 */ { "Network Information Service+ Domain",      string },
 198                 /*  65 */ { "Network Information Service+ Servers",     ipv4 },
 199                 /*  66 */ { "TFTP Server Name",                                         string },
 200                 /*  67 */ { "Bootfile name",                                            string },
 201                 /*  68 */ { "Mobile IP Home Agent",                                     ipv4 },
 202                 /*  69 */ { "SMTP Server",                                                      ipv4 },
 203                 /*  70 */ { "POP3 Server",                                                      ipv4 },
 204                 /*  71 */ { "NNTP Server",                                                      ipv4 },
 205                 /*  72 */ { "Default WWW Server",                                       ipv4 },
 206                 /*  73 */ { "Default Finger Server",                            ipv4 },
 207                 /*  74 */ { "Default IRC Server",                                       ipv4 },
 208                 /*  75 */ { "StreetTalk Server",                                        ipv4 },
 209                 /*  76 */ { "StreetTalk Directory Assistance Server", ipv4 },
 210                 /*  77 */ { "User Class Information",                           opaque },
 211                 /*  78 */ { "Directory Agent Information",                      opaque },
 212                 /*  79 */ { "Service Location Agent Scope",                     opaque },
 213                 /*  80 */ { "Naming Authority",                                         opaque },
 214                 /*  81 */ { "Client Fully Qualified Domain Name",       opaque },
 215                 /*  82 */ { "Agent Circuit ID",                                         opaque },
 216                 /*  83 */ { "Agent Remote ID",                                          opaque },
 217                 /*  84 */ { "Agent Subnet Mask",                                        opaque },
 218                 /*  85 */ { "Novell Directory Services Servers",        opaque },
 219                 /*  86 */ { "Novell Directory Services Tree Name",      opaque },
 220                 /*  87 */ { "Novell Directory Services Context",        opaque },
 221                 /*  88 */ { "IEEE 1003.1 POSIX Timezone",                       opaque },
 222                 /*  89 */ { "Fully Qualified Domain Name",                      opaque },
 223                 /*  90 */ { "Authentication",                                           opaque },
 224                 /*  91 */ { "Vines TCP/IP Server Option",                       opaque },
 225                 /*  92 */ { "Server Selection Option",                          opaque },
 226                 /*  93 */ { "Client System Architecture",                       opaque },
 227                 /*  94 */ { "Client Network Device Interface",          opaque },
 228                 /*  95 */ { "Lightweight Directory Access Protocol",    opaque },
 229                 /*  96 */ { "IPv6 Transitions",                                         opaque },
 230                 /*  97 */ { "UUID/GUID-based Client Identifier",        opaque },
 231                 /*  98 */ { "Open Group's User Authentication",         opaque },
 232                 /*  99 */ { "Unassigned",                                                       opaque },
 233                 /* 100 */ { "Printer Name",                                                     opaque },
 234                 /* 101 */ { "MDHCP multicast address",                          opaque },
 235                 /* 102 */ { "Removed/unassigned",                                       opaque },
 236                 /* 103 */ { "Removed/unassigned",                                       opaque },
 237                 /* 104 */ { "Removed/unassigned",                                       opaque },
 238                 /* 105 */ { "Removed/unassigned",                                       opaque },
 239                 /* 106 */ { "Removed/unassigned",                                       opaque },
 240                 /* 107 */ { "Removed/unassigned",                                       opaque },
 241                 /* 108 */ { "Swap Path Option",                                         opaque },
 242                 /* 109 */ { "Unassigned",                                                       opaque },
 243                 /* 110 */ { "IPX Compability",                                          opaque },
 244                 /* 111 */ { "Unassigned",                                                       opaque },
 245                 /* 112 */ { "Netinfo Parent Server Address",            opaque },
 246                 /* 113 */ { "Netinfo Parent Server Tag",                        opaque },
 247                 /* 114 */ { "URL",                                                                      opaque },
 248                 /* 115 */ { "DHCP Failover Protocol",                           opaque },
 249                 /* 116 */ { "DHCP Auto-Configuration",                          opaque },
 250                 /* 117 */ { "Unassigned",                                                       opaque },
 251                 /* 118 */ { "Unassigned",                                                       opaque },
 252                 /* 119 */ { "Unassigned",                                                       opaque },
 253                 /* 120 */ { "Unassigned",                                                       opaque },
 254                 /* 121 */ { "Unassigned",                                                       opaque },
 255                 /* 122 */ { "Unassigned",                                                       opaque },
 256                 /* 123 */ { "Unassigned",                                                       opaque },
 257                 /* 124 */ { "Unassigned",                                                       opaque },
 258                 /* 125 */ { "Unassigned",                                                       opaque },
 259                 /* 126 */ { "Extension",                                                        opaque },
 260                 /* 127 */ { "Extension",                                                        opaque }
 261         };
 262
 263         /* Options whose length isn't "vlen + 2". */
 264         switch (code) {
 265
 266         case 0:         /* Padding */
 267                 /* check how much padding we have */
 268                 for (i = voff + 1; i < eoff; i++ ) {
 269                         if (tvb_get_guint8(tvb, i) != 0) {
 270                                 break;
 271                         }
 272                 }
 273                 i = i - voff;
 274                 if (bp_tree != NULL)
 275                         proto_tree_add_text(bp_tree, tvb, voff, i, "Padding");
 276                 consumed = i;
 277                 return consumed;
 278                 break;
 279
 280         case 255:       /* End Option */
 281                 if (bp_tree != NULL)
 282                         proto_tree_add_text(bp_tree, tvb, voff, 1, "End Option");
 283                 consumed = 1;
 284                 return consumed;
 285         }
 286
 287         /*
 288          * Get the length of the option, and the number of bytes it
 289          * consumes (the length doesn't include the option code or
 290          * length bytes).
 291          */
 292         vlen = tvb_get_guint8(tvb, voff+1);
 293         consumed = vlen + 2;
 294         if (bp_tree == NULL) {
 295                 /* Don't put anything in the protocol tree. */
 296                 return consumed;
 297         }
 298
 299         text = opt[code].text;
 300         /* Special cases */
 301         switch (code) {
 302
 303         case 21:        /* Policy Filter */
 304                 if (vlen == 8) {
 305                         /* one IP address pair */
 306                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 307                                 "Option %d: %s = %s/%s", code, text,
 308                                 ip_to_str(tvb_get_ptr(tvb, voff+2, 4)),
 309                                 ip_to_str(tvb_get_ptr(tvb, voff+6, 4)));
 310                 } else {
 311                         /* > 1 IP address pair. Let's make a sub-tree */
 312                         vti = proto_tree_add_text(bp_tree, tvb, voff,
 313                                 consumed, "Option %d: %s", code, text);
 314                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 315                         for (i = voff + 2; i < voff + consumed; i += 8) {
 316                                 proto_tree_add_text(v_tree, tvb, i, 8, "IP Address/Mask: %s/%s",
 317                                         ip_to_str(tvb_get_ptr(tvb, i, 4)),
 318                                         ip_to_str(tvb_get_ptr(tvb, i+4, 4)));
 319                         }
 320                 }
 321                 break;
 322
 323         case 33:        /* Static Route */
 324                 if (vlen == 8) {
 325                         /* one IP address pair */
 326                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 327                                 "Option %d: %s = %s/%s", code, text,
 328                                 ip_to_str(tvb_get_ptr(tvb, voff+2, 4)),
 329                                 ip_to_str(tvb_get_ptr(tvb, voff+6, 4)));
 330                 } else {
 331                         /* > 1 IP address pair. Let's make a sub-tree */
 332                         vti = proto_tree_add_text(bp_tree, tvb, voff,
 333                                 consumed, "Option %d: %s", code, text);
 334                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 335                         for (i = voff + 2; i < voff + consumed; i += 8) {
 336                                 proto_tree_add_text(v_tree, tvb, i, 8,
 337                                         "Destination IP Address/Router: %s/%s",
 338                                         ip_to_str(tvb_get_ptr(tvb, i, 4)),
 339                                         ip_to_str(tvb_get_ptr(tvb, i+4, 4)));
 340                         }
 341                 }
 342                 break;
 343
 344         case 43:        /* Vendor-Specific Info */
 345                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 346                                 "Option %d: %s", code, text);
 347                 break;
 348
 349         case 46:        /* NetBIOS-over-TCP/IP Node Type */
 350                 byte = tvb_get_guint8(tvb, voff+2);
 351                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 352                                 "Option %d: %s = %s", code, text,
 353                                 val_to_str(byte, nbnt_vals,
 354                                     "Unknown (0x%02x)"));
 355                 break;
 356
 357         case 53:        /* DHCP Message Type */
 358                 proto_tree_add_text(bp_tree, tvb, voff, 3, "Option %d: %s = DHCP %s",
 359                         code, text, get_dhcp_type(tvb_get_guint8(tvb, voff+2)));
 360                 break;
 361
 362         case 55:        /* Parameter Request List */
 363                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 364                         vlen + 2, "Option %d: %s", code, text);
 365                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 366                 for (i = 0; i < vlen; i++) {
 367                         byte = tvb_get_guint8(tvb, voff+2+i);
 368                         if (byte < NUM_OPT_INFOS) {
 369                                 proto_tree_add_text(v_tree, tvb, voff+2+i, 1, "%d = %s",
 370                                                 byte, opt[byte].text);
 371                         } else {
 372                                 proto_tree_add_text(vti, tvb, voff+2+i, 1,
 373                                         "Unknown Option Code: %d", byte);
 374                         }
 375                 }
 376                 break;
 377
 378         case 61:        /* Client Identifier */
 379                 /* We *MAY* use hwtype/hwaddr. If we have 7 bytes, I'll
 380                    guess that the first is the hwtype, and the last 6
 381                    are the hw addr */
 382                 if (vlen == 7) {
 383                         guint8 htype;
 384
 385                         vti = proto_tree_add_text(bp_tree, tvb, voff,
 386                                 consumed, "Option %d: %s", code, text);
 387                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 388                         htype = tvb_get_guint8(tvb, voff+2);
 389                         proto_tree_add_text(v_tree, tvb, voff+2, 1,
 390                                 "Hardware type: %s",
 391                                 arphrdtype_to_str(htype,
 392                                         "Unknown (0x%02x)"));
 393                         proto_tree_add_text(v_tree, tvb, voff+3, 6,
 394                                 "Client hardware address: %s",
 395                                 arphrdaddr_to_str(tvb_get_ptr(tvb, voff+3, 6),
 396                                         6, htype));
 397                 } else {
 398                         /* otherwise, it's opaque data */
 399                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 400                                 "Option %d: %s (%d bytes)", code, text, vlen);
 401                 }
 402                 break;
 403
 404         case 63:        /* NetWare/IP options */
 405                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 406                     consumed, "Option %d: %s", code, text);
 407                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 408
 409                 optp = voff+2;
 410                 while (optp < voff+consumed)
 411                         optp = dissect_netware_ip_suboption(v_tree, tvb, optp);
 412                 break;
 413
 414         default:        /* not special */
 415                 break;
 416         }
 417
 418         /* Normal cases */
 419         if (code < NUM_OPT_INFOS) {
 420                 text = opt[code].text;
 421                 ftype = opt[code].ftype;
 422
 423                 switch (ftype) {
 424
 425                 case special:
 426                         return consumed;
 427
 428                 case ipv4:
 429                         if (vlen == 4) {
 430                                 /* one IP address */
 431                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 432                                         "Option %d: %s = %s", code, text,
 433                                         ip_to_str(tvb_get_ptr(tvb, voff+2, 4)));
 434                         } else {
 435                                 /* > 1 IP addresses. Let's make a sub-tree */
 436                                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 437                                         consumed, "Option %d: %s", code, text);
 438                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 439                                 for (i = voff + 2; i < voff + consumed; i += 4) {
 440                                         proto_tree_add_text(v_tree, tvb, i, 4, "IP Address: %s",
 441                                                 ip_to_str(tvb_get_ptr(tvb, i, 4)));
 442                                 }
 443                         }
 444                         break;
 445
 446                 case string:
 447                         /* Fix for non null-terminated string supplied by
 448                          * John Lines <John.Lines@aeat.co.uk>
 449                          */
 450                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 451                                         "Option %d: %s = %.*s", code, text, vlen,
 452                                         tvb_get_ptr(tvb, voff+2, consumed-2));
 453                         break;
 454
 455                 case opaque:
 456                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 457                                         "Option %d: %s (%d bytes)",
 458                                         code, text, vlen);
 459                         break;
 460
 461                 case val_u_short:
 462                         if (vlen == 2) {
 463                                 /* one u_short */
 464                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 465                                                 "Option %d: %s = %d", code, text,
 466                                                 tvb_get_ntohs(tvb, voff+2));
 467                         } else {
 468                                 /* > 1 u_short */
 469                                 vti = proto_tree_add_text(bp_tree, tvb, voff,
 470                                         consumed, "Option %d: %s", code, text);
 471                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 472                                 for (i = voff + 2; i < voff + consumed; i += 2) {
 473                                         proto_tree_add_text(v_tree, tvb, i, 4, "Value: %d",
 474                                                 tvb_get_ntohs(tvb, i));
 475                                 }
 476                         }
 477                         break;
 478
 479                 case val_u_long:
 480                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 481                                         "Option %d: %s = %d", code, text,
 482                                         tvb_get_ntohl(tvb, voff+2));
 483                         break;
 484
 485                 case val_u_byte:
 486                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 487                                         "Option %d: %s = %d", code, text,
 488                                         tvb_get_guint8(tvb, voff+2));
 489                         break;
 490
 491                 case toggle:
 492                         i = tvb_get_guint8(tvb, voff+2);
 493                         if (i != 0 && i != 1) {
 494                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 495                                                 "Option %d: %s = Invalid Value %d", code, text,
 496                                                 i);
 497                         } else {
 498                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 499                                                 "Option %d: %s = %s", code, text,
 500                                                 i == 0 ? "Disabled" : "Enabled");
 501                         }
 502                         break;
 503
 504                 case yes_no:
 505                         i = tvb_get_guint8(tvb, voff+2);
 506                         if (i != 0 && i != 1) {
 507                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 508                                                 "Option %d: %s = Invalid Value %d", code, text,
 509                                                 i);
 510                         } else {
 511                                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 512                                                 "Option %d: %s = %s", code, text,
 513                                                 i == 0 ? "No" : "Yes");
 514                         }
 515                         break;
 516
 517                 case time_in_secs:
 518                         time_secs = tvb_get_ntohl(tvb, voff+2);
 519                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 520                                 "Option %d: %s = %s", code, text,
 521                                 ((time_secs == 0xffffffff) ?
 522                                     "infinity" :
 523                                     time_secs_to_str(time_secs)));
 524                         break;
 525
 526                 default:
 527                         proto_tree_add_text(bp_tree, tvb, voff, consumed,
 528                                         "Option %d: %s (%d bytes)", code, text, vlen);
 529                 }
 530         } else {
 531                 proto_tree_add_text(bp_tree, tvb, voff, consumed,
 532                                 "Unknown Option Code: %d (%d bytes)", code, vlen);
 533         }
 534
 535         return consumed;
 536 }
 537
 538 static int
 539 dissect_netware_ip_suboption(proto_tree *v_tree, tvbuff_t *tvb, int optp)
 540 {
 541         guint8 subopt;
 542         guint8 subopt_len;
 543         int slask;
 544         proto_tree *o63_v_tree;
 545         proto_item *vti;
 546
 547         struct o63_opt_info {
 548                 char    *truet;
 549                 char    *falset;
 550                 enum field_type ft;
 551         };
 552
 553         static struct o63_opt_info o63_opt[]= {
 554                 /* 0 */ {"","",none},
 555                 /* 1 */ {"NWIP does not exist on subnet","",string},
 556                 /* 2 */ {"NWIP exist in options area","",string},
 557                 /* 3 */ {"NWIP exists in sname/file","",string},
 558                 /* 4 */ {"NWIP exists, but too big","",string},
 559                 /* 5 */ {"Broadcast for nearest Netware server","Do NOT Broadcast for nearest Netware server",yes_no},
 560                 /* 6 */ {"Preferred DSS server","",ipv4},
 561                 /* 7 */ {"Nearest NWIP server","",ipv4},
 562                 /* 8 */ {"Autoretries","",val_u_short},
 563                 /* 9 */ {"Autoretry delay, secs ","",val_u_short},
 564                 /* 10*/ {"Support NetWare/IP v1.1","Do NOT support NetWare/IP v1.1",yes_no},
 565                 /* 11*/ {"Primary DSS ", "" , special}
 566         };
 567
 568         subopt = tvb_get_guint8(tvb, optp);
 569         if (subopt > NUM_O63_SUBOPTS) {
 570                 proto_tree_add_text(v_tree, tvb,optp,1,"Unknown suboption %d", subopt);
 571                 optp++;
 572         } else {
 573                 switch (o63_opt[subopt].ft) {
 574
 575                 case string:
 576                         proto_tree_add_text(v_tree, tvb, optp, 2, "Suboption %d: %s", subopt, o63_opt[subopt].truet);
 577                         optp+=2;
 578                         break;
 579
 580                 case yes_no:
 581                         if (tvb_get_guint8(tvb, optp+2)==1) {
 582                                 proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s", subopt, o63_opt[subopt].truet);
 583                         } else {
 584                                 proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s" , subopt, o63_opt[subopt].falset);
 585                         }
 586                         optp+=3;
 587                         break;
 588
 589                 case special:
 590                         proto_tree_add_text(v_tree, tvb, optp, 6,
 591                             "Suboption %d: %s = %s" ,
 592                             subopt, o63_opt[subopt].truet,
 593                             ip_to_str(tvb_get_ptr(tvb, optp+2, 4)));
 594                         optp=optp+6;
 595                         break;
 596
 597                 case val_u_short:
 598                         proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s = %u",
 599                             subopt, o63_opt[subopt].truet,
 600                             tvb_get_guint8(tvb, optp+2));       /* XXX - 1 byte? */
 601                         optp+=3;
 602                         break;
 603
 604                 case ipv4:
 605                         subopt_len = tvb_get_guint8(tvb, optp+1);
 606                         if (subopt_len == 4) {
 607                                 /* one IP address */
 608                                 proto_tree_add_text(v_tree, tvb, optp, 6,
 609                                     "Suboption %d : %s = %s",
 610                                     subopt, o63_opt[subopt].truet,
 611                                     ip_to_str(tvb_get_ptr(tvb, optp+2, 4)));
 612                                 optp=optp+6;
 613                         } else {
 614                                 /* > 1 IP addresses. Let's make a sub-tree */
 615                                 vti = proto_tree_add_text(v_tree, tvb, optp,
 616                                     subopt_len+2, "Suboption %d: %s",
 617                                     subopt, o63_opt[subopt].truet);
 618                                 o63_v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 619                                 for (slask = optp + 2 ; slask < optp+subopt_len; slask += 4) {
 620                                         proto_tree_add_text(o63_v_tree, tvb, slask, 4, "IP Address: %s",
 621                                             ip_to_str(tvb_get_ptr(tvb, slask, 4)));
 622                                 }
 623                                 optp=slask;
 624                         }
 625                         break;
 626                 default:
 627                         proto_tree_add_text(v_tree, tvb,optp,1,"Unknown suboption %d", subopt);
 628                         optp++;
 629                         break;
 630                 }
 631         }
 632         return optp;
 633 }
 634
 635 #define BOOTREQUEST     1
 636 #define BOOTREPLY       2
 637
 638 static const value_string op_vals[] = {
 639         { BOOTREQUEST,  "Boot Request" },
 640         { BOOTREPLY,    "Boot Reply" },
 641         { 0,            NULL }
 642 };
 643
 644 static void
 645 dissect_bootp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 646 {
 647         proto_tree      *bp_tree = NULL;
 648         proto_item      *ti;
 649         guint8          op;
 650         guint8          htype, hlen;
 651         guint8          *haddr;
 652         int             voff, eoff; /* vender offset, end offset */
 653         guint32         ip_addr;
 654         gboolean        is_dhcp = FALSE;
 655         const char      *dhcp_type;
 656
 657         CHECK_DISPLAY_AS_DATA(proto_bootp, tvb, pinfo, tree);
 658
 659         pinfo->current_proto = "BOOTP/DHCP";
 660
 661         if (check_col(pinfo->fd, COL_PROTOCOL))
 662                 col_set_str(pinfo->fd, COL_PROTOCOL, "BOOTP");
 663         if (check_col(pinfo->fd, COL_INFO)) {
 664                 /*
 665                  * In case we throw an exception fetching the opcode, etc.
 666                  */
 667                 col_clear(pinfo->fd, COL_INFO);
 668         }
 669
 670         op = tvb_get_guint8(tvb, 0);
 671         htype = tvb_get_guint8(tvb, 1);
 672         hlen = tvb_get_guint8(tvb, 2);
 673         if (check_col(pinfo->fd, COL_INFO)) {
 674                 switch (op) {
 675
 676                 case BOOTREQUEST:
 677                         col_add_fstr(pinfo->fd, COL_INFO, "Boot Request from %s",
 678                                 arphrdaddr_to_str(tvb_get_ptr(tvb, 28, hlen),
 679                                         hlen, htype));
 680                         break;
 681
 682                 case BOOTREPLY:
 683                         col_set_str(pinfo->fd, COL_INFO, "Boot Reply");
 684                         break;
 685
 686                 default:
 687                         col_add_fstr(pinfo->fd, COL_INFO, "Unknown BOOTP message type (%u)",
 688                             op);
 689                         break;
 690                 }
 691         }
 692
 693         if (tree) {
 694                 ti = proto_tree_add_item(tree, proto_bootp, tvb, 0,
 695                     tvb_length(tvb), FALSE);
 696                 bp_tree = proto_item_add_subtree(ti, ett_bootp);
 697
 698                 proto_tree_add_uint(bp_tree, hf_bootp_type, tvb,
 699                                            0, 1,
 700                                            op);
 701                 proto_tree_add_uint_format(bp_tree, hf_bootp_hw_type, tvb,
 702                                            1, 1,
 703                                            htype,
 704                                            "Hardware type: %s",
 705                                            arphrdtype_to_str(htype,
 706                                                              "Unknown (0x%02x)"));
 707                 proto_tree_add_uint(bp_tree, hf_bootp_hw_len, tvb,
 708                                     2, 1, hlen);
 709                 proto_tree_add_item(bp_tree, hf_bootp_hops, tvb,
 710                                     3, 1, FALSE);
 711                 proto_tree_add_item(bp_tree, hf_bootp_id, tvb,
 712                                     4, 4, FALSE);
 713                 proto_tree_add_item(bp_tree, hf_bootp_secs, tvb,
 714                                     8, 2, FALSE);
 715                 proto_tree_add_uint(bp_tree, hf_bootp_flag, tvb,
 716                                     10, 2, tvb_get_ntohs(tvb, 10) & 0x8000);
 717
 718                 proto_tree_add_item(bp_tree, hf_bootp_ip_client, tvb,
 719                                     12, 4, FALSE);
 720                 proto_tree_add_item(bp_tree, hf_bootp_ip_your, tvb,
 721                                     16, 4, FALSE);
 722                 proto_tree_add_item(bp_tree, hf_bootp_ip_server, tvb,
 723                                     20, 4, FALSE);
 724                 proto_tree_add_item(bp_tree, hf_bootp_ip_relay, tvb,
 725                                     24, 4, FALSE);
 726
 727                 if (hlen > 0) {
 728                         haddr = tvb_get_ptr(tvb, 28, hlen);
 729                         proto_tree_add_bytes_format(bp_tree, hf_bootp_hw_addr, tvb,
 730                                                    28, hlen,
 731                                                    haddr,
 732                                                    "Client hardware address: %s",
 733                                                    arphrdaddr_to_str(haddr,
 734                                                                      hlen,
 735                                                                      htype));
 736                 }
 737                 else {
 738                         proto_tree_add_text(bp_tree,  tvb,
 739                                                    28, 0, "Client address not given");
 740                 }
 741
 742                 /* The server host name is optional */
 743                 if (tvb_get_guint8(tvb, 44) != '\0') {
 744                         proto_tree_add_item(bp_tree, hf_bootp_server, tvb,
 745                                                    44, 64, FALSE);
 746                 }
 747                 else {
 748                         proto_tree_add_string_format(bp_tree, hf_bootp_server, tvb,
 749                                                    44, 64,
 750                                                    tvb_get_ptr(tvb, 44, 1),
 751                                                    "Server host name not given");
 752                 }
 753
 754                 /* Boot file */
 755                 if (tvb_get_guint8(tvb, 108) != '\0') {
 756                         proto_tree_add_item(bp_tree, hf_bootp_file, tvb,
 757                                                    108, 128, FALSE);
 758                 }
 759                 else {
 760                         proto_tree_add_string_format(bp_tree, hf_bootp_file, tvb,
 761                                                    108, 128,
 762                                                    tvb_get_ptr(tvb, 108, 1),
 763                                                    "Boot file name not given");
 764                 }
 765
 766                 tvb_memcpy(tvb, (void *)&ip_addr, 236, sizeof(ip_addr));
 767                 if (tvb_get_ntohl(tvb, 236) == 0x63825363) {
 768                         proto_tree_add_ipv4_format(bp_tree, hf_bootp_cookie, tvb,
 769                                             236, 4, ip_addr,
 770                                             "Magic cookie: (OK)");
 771                 }
 772                 else {
 773                         proto_tree_add_ipv4(bp_tree, hf_bootp_cookie, tvb,
 774                                             236, 4, ip_addr);
 775                 }
 776         }
 777
 778         voff = 240;
 779         eoff = tvb_reported_length(tvb);
 780         while (voff < eoff) {
 781                 /* Handle the DHCP option specially here, so that we
 782                    can flag DHCP packets as such. */
 783                 if (!is_dhcp && tvb_get_guint8(tvb, voff) == 53) {
 784                         /*
 785                          * We haven't already seen a DHCP Type option, and
 786                          * this is a DHCP Type option, so flag this packet
 787                          * as DHCP.
 788                          */
 789                         dhcp_type = get_dhcp_type(tvb_get_guint8(tvb, voff+2));
 790                         if (check_col(pinfo->fd, COL_PROTOCOL))
 791                                 col_set_str(pinfo->fd, COL_PROTOCOL, "DHCP");
 792                         if (check_col(pinfo->fd, COL_INFO))
 793                                 col_add_fstr(pinfo->fd, COL_INFO, "DHCP %-8s - Transaction ID 0x%x",
 794                                     dhcp_type, tvb_get_ntohl(tvb, 4));
 795                         if (tree)
 796                                 proto_tree_add_boolean_hidden(bp_tree, hf_bootp_dhcp,
 797                                     tvb, 0, 0, 1);
 798                         is_dhcp = TRUE;
 799                 }
 800                 voff += bootp_option(tvb, bp_tree, voff, eoff);
 801         }
 802 }
 803
 804 void
 805 proto_register_bootp(void)
 806 {
 807   static hf_register_info hf[] = {
 808     { &hf_bootp_dhcp,
 809       { "Frame is DHCP",                "bootp.dhcp",    FT_BOOLEAN,
 810         BASE_NONE,                      NULL,            0x0,
 811         "" }},
 812
 813     { &hf_bootp_type,
 814       { "Message type",                 "bootp.type",    FT_UINT8,
 815          BASE_DEC,                      VALS(op_vals),   0x0,
 816         "" }},
 817
 818     { &hf_bootp_hw_type,
 819       { "Hardware type",                "bootp.hw.type", FT_UINT8,
 820         BASE_HEX,                       NULL,            0x0,
 821         "" }},
 822
 823     { &hf_bootp_hw_len,
 824       { "Hardware address length",      "bootp.hw.len",  FT_UINT8,
 825         BASE_DEC,                       NULL,            0x0,
 826         "" }},
 827
 828     { &hf_bootp_hops,
 829       { "Hops",                         "bootp.hops",    FT_UINT8,
 830         BASE_DEC,                       NULL,            0x0,
 831         "" }},
 832
 833     { &hf_bootp_id,
 834       { "Transaction ID",               "bootp.id",      FT_UINT32,
 835         BASE_HEX,                        NULL,           0x0,
 836         "" }},
 837
 838     { &hf_bootp_secs,
 839       { "Seconds elapsed",              "bootp.secs",    FT_UINT16,
 840         BASE_DEC,                        NULL,           0x0,
 841         "" }},
 842
 843     { &hf_bootp_flag,
 844       { "Broadcast flag",               "bootp.flag",    FT_UINT16,
 845         BASE_HEX,                       NULL,            0x0,
 846         "" }},
 847
 848     { &hf_bootp_ip_client,
 849       { "Client IP address",            "bootp.ip.client",FT_IPv4,
 850         BASE_NONE,                      NULL,             0x0,
 851         "" }},
 852
 853     { &hf_bootp_ip_your,
 854       { "Your (client) IP address",     "bootp.ip.your",  FT_IPv4,
 855         BASE_NONE,                      NULL,             0x0,
 856         "" }},
 857
 858     { &hf_bootp_ip_server,
 859       { "Next server IP address",       "bootp.ip.server",FT_IPv4,
 860         BASE_NONE,                      NULL,             0x0,
 861         "" }},
 862
 863     { &hf_bootp_ip_relay,
 864       { "Relay agent IP address",       "bootp.ip.relay", FT_IPv4,
 865         BASE_NONE,                      NULL,             0x0,
 866         "" }},
 867
 868     { &hf_bootp_hw_addr,
 869       { "Client hardware address",      "bootp.hw.addr", FT_BYTES,
 870         BASE_NONE,                      NULL,            0x0,
 871         "" }},
 872
 873     { &hf_bootp_server,
 874       { "Server host name",             "bootp.server",  FT_STRING,
 875         BASE_NONE,                      NULL,            0x0,
 876         "" }},
 877
 878     { &hf_bootp_file,
 879       { "Boot file name",               "bootp.file",    FT_STRING,
 880         BASE_NONE,                      NULL,            0x0,
 881         "" }},
 882
 883     { &hf_bootp_cookie,
 884       { "Magic cookie",                 "bootp.cookie",  FT_IPv4,
 885          BASE_NONE,                     NULL,            0x0,
 886         "" }},
 887   };
 888   static gint *ett[] = {
 889     &ett_bootp,
 890     &ett_bootp_option,
 891   };
 892
 893   proto_bootp = proto_register_protocol("Bootstrap Protocol", "BOOTP/DHCP",
 894                                         "bootp");
 895   proto_register_field_array(proto_bootp, hf, array_length(hf));
 896   proto_register_subtree_array(ett, array_length(ett));
 897 }
 898
 899 void
 900 proto_reg_handoff_bootp(void)
 901 {
 902   dissector_add("udp.port", UDP_PORT_BOOTPS, dissect_bootp);
 903 }