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 1.40 2000/08/13 14:08:03 deniel 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 <glib.h>
  45 #include "packet.h"
  46 #include "packet-arp.h"
  47
  48 static int proto_bootp = -1;
  49 static int hf_bootp_type = -1;
  50 static int hf_bootp_hw_type = -1;
  51 static int hf_bootp_hw_len = -1;
  52 static int hf_bootp_hops = -1;
  53 static int hf_bootp_id = -1;
  54 static int hf_bootp_secs = -1;
  55 static int hf_bootp_flag = -1;
  56 static int hf_bootp_ip_client = -1;
  57 static int hf_bootp_ip_your = -1;
  58 static int hf_bootp_ip_server = -1;
  59 static int hf_bootp_ip_relay = -1;
  60 static int hf_bootp_hw_addr = -1;
  61 static int hf_bootp_server = -1;
  62 static int hf_bootp_file = -1;
  63 static int hf_bootp_cookie = -1;
  64 static int hf_bootp_dhcp = -1;
  65
  66 static guint ett_bootp = -1;
  67 static guint ett_bootp_option = -1;
  68
  69 #define UDP_PORT_BOOTPS  67
  70
  71 enum field_type { none, ipv4, string, toggle, yes_no, special, opaque,
  72         time_in_secs,
  73         val_u_byte, val_u_short, val_u_long,
  74         val_s_long };
  75
  76 struct opt_info {
  77         char    *text;
  78         enum field_type ftype;
  79 };
  80
  81 #define NUM_OPT_INFOS 128
  82 #define NUM_O63_SUBOPTS 11
  83
  84 static int dissect_netware_ip_suboption(proto_tree *v_tree, const u_char *pd,
  85     int optp);
  86
  87 static const char *
  88 get_dhcp_type(guint8 byte)
  89 {
  90         static const char       *opt53_text[] = {
  91                 "Unknown Message Type",
  92                 "Discover",
  93                 "Offer",
  94                 "Request",
  95                 "Decline",
  96                 "ACK",
  97                 "NAK",
  98                 "Release",
  99                 "Inform"
 100         };
 101         int i;
 102
 103         if (byte > 0 && byte < (sizeof opt53_text / sizeof opt53_text[0]))
 104                 i = byte;
 105         else
 106                 i = 0;
 107         return opt53_text[i];
 108 }
 109
 110 /* Returns the number of bytes consumed by this option. */
 111 static int
 112 bootp_option(const u_char *pd, proto_tree *bp_tree, int voff, int eoff)
 113 {
 114         char                    *text;
 115         enum field_type         ftype;
 116         u_char                  code = pd[voff];
 117         int                     vlen = pd[voff+1];
 118         u_char                  byte;
 119         int                     i,optp, consumed = vlen + 2;
 120         u_long                  time_secs;
 121         proto_tree              *v_tree;
 122         proto_item              *vti;
 123
 124         static const value_string nbnt_vals[] = {
 125             {0x1,   "B-node" },
 126             {0x2,   "P-node" },
 127             {0x4,   "M-node" },
 128             {0x8,   "H-node" },
 129             {0,     NULL     } };
 130
 131         static struct opt_info opt[] = {
 132                 /*   0 */ { "Padding",                                                          none },
 133                 /*   1 */ { "Subnet Mask",                                                      ipv4 },
 134                 /*   2 */ { "Time Offset",                                                      val_s_long },
 135                 /*   3 */ { "Router",                                                           ipv4 },
 136                 /*   4 */ { "Time Server",                                                      ipv4 },
 137                 /*   5 */ { "Name Server",                                                      ipv4 },
 138                 /*   6 */ { "Domain Name Server",                                       ipv4 },
 139                 /*   7 */ { "Log Server",                                                       ipv4 },
 140                 /*   8 */ { "Cookie Server",                                            ipv4 },
 141                 /*   9 */ { "LPR Server",                                                       ipv4 },
 142                 /*  10 */ { "Impress Server",                                           ipv4 },
 143                 /*  11 */ { "Resource Location Server",                         ipv4 },
 144                 /*  12 */ { "Host Name",                                                        string },
 145                 /*  13 */ { "Boot File Size",                                           val_u_short },
 146                 /*  14 */ { "Merit Dump File",                                          string },
 147                 /*  15 */ { "Domain Name",                                                      string },
 148                 /*  16 */ { "Swap Server",                                                      ipv4 },
 149                 /*  17 */ { "Root Path",                                                        string },
 150                 /*  18 */ { "Extensions Path",                                          string },
 151                 /*  19 */ { "IP Forwarding",                                            toggle },
 152                 /*  20 */ { "Non-Local Source Routing",                         toggle },
 153                 /*  21 */ { "Policy Filter",                                            special },
 154                 /*  22 */ { "Maximum Datagram Reassembly Size",         val_u_short },
 155                 /*  23 */ { "Default IP Time-to-Live",                          val_u_byte },
 156                 /*  24 */ { "Path MTU Aging Timeout",                           time_in_secs },
 157                 /*  25 */ { "Path MTU Plateau Table",                           val_u_short },
 158                 /*  26 */ { "Interface MTU",                                            val_u_short },
 159                 /*  27 */ { "All Subnets are Local",                            yes_no },
 160                 /*  28 */ { "Broadcast Address",                                        ipv4 },
 161                 /*  29 */ { "Perform Mask Discovery",                           toggle },
 162                 /*  30 */ { "Mask Supplier",                                            yes_no },
 163                 /*  31 */ { "Perform Router Discover",                          toggle },
 164                 /*  32 */ { "Router Solicitation Address",                      ipv4 },
 165                 /*  33 */ { "Static Route",                                                     special },
 166                 /*  34 */ { "Trailer Encapsulation",                            toggle },
 167                 /*  35 */ { "ARP Cache Timeout",                                        time_in_secs },
 168                 /*  36 */ { "Ethernet Encapsulation",                           toggle },
 169                 /*  37 */ { "TCP Default TTL",                                          val_u_byte },
 170                 /*  38 */ { "TCP Keepalive Interval",                           time_in_secs },
 171                 /*  39 */ { "TCP Keepalive Garbage",                            toggle },
 172                 /*  40 */ { "Network Information Service Domain",       string },
 173                 /*  41 */ { "Network Information Service Servers",      ipv4 },
 174                 /*  42 */ { "Network Time Protocol Servers",            ipv4 },
 175                 /*  43 */ { "Vendor-Specific Information",                      special },
 176                 /*  44 */ { "NetBIOS over TCP/IP Name Server",          ipv4 },
 177                 /*  45 */ { "NetBIOS over TCP/IP Datagram Distribution Name Server", ipv4 },
 178                 /*  46 */ { "NetBIOS over TCP/IP Node Type",            special },
 179                 /*  47 */ { "NetBIOS over TCP/IP Scope",                        string },
 180                 /*  48 */ { "X Window System Font Server",                      ipv4 },
 181                 /*  49 */ { "X Window System Display Manager",          ipv4 },
 182                 /*  50 */ { "Requested IP Address",                                     ipv4 },
 183                 /*  51 */ { "IP Address Lease Time",                            time_in_secs },
 184                 /*  52 */ { "Option Overload",                                          special },
 185                 /*  53 */ { "DHCP Message Type",                                        special },
 186                 /*  54 */ { "Server Identifier",                                        ipv4 },
 187                 /*  55 */ { "Parameter Request List",                           special },
 188                 /*  56 */ { "Message",                                                          string },
 189                 /*  57 */ { "Maximum DHCP Message Size",                        val_u_short },
 190                 /*  58 */ { "Renewal Time Value",                                       time_in_secs },
 191                 /*  59 */ { "Rebinding Time Value",                                     time_in_secs },
 192                 /*  60 */ { "Vendor class identifier",                          opaque },
 193                 /*  61 */ { "Client identifier",                                        special },
 194                 /*  62 */ { "Novell/Netware IP domain",                                 string },
 195                 /*  63 */ { "Novell Options",   special },
 196                 /*  64 */ { "Network Information Service+ Domain",      string },
 197                 /*  65 */ { "Network Information Service+ Servers",     ipv4 },
 198                 /*  66 */ { "TFTP Server Name",                                         string },
 199                 /*  67 */ { "Bootfile name",                                            string },
 200                 /*  68 */ { "Mobile IP Home Agent",                                     ipv4 },
 201                 /*  69 */ { "SMTP Server",                                                      ipv4 },
 202                 /*  70 */ { "POP3 Server",                                                      ipv4 },
 203                 /*  71 */ { "NNTP Server",                                                      ipv4 },
 204                 /*  72 */ { "Default WWW Server",                                       ipv4 },
 205                 /*  73 */ { "Default Finger Server",                            ipv4 },
 206                 /*  74 */ { "Default IRC Server",                                       ipv4 },
 207                 /*  75 */ { "StreetTalk Server",                                        ipv4 },
 208                 /*  76 */ { "StreetTalk Directory Assistance Server", ipv4 },
 209                 /*  77 */ { "User Class Information",                           opaque },
 210                 /*  78 */ { "Directory Agent Information",                      opaque },
 211                 /*  79 */ { "Service Location Agent Scope",                     opaque },
 212                 /*  80 */ { "Naming Authority",                                         opaque },
 213                 /*  81 */ { "Client Fully Qualified Domain Name",       opaque },
 214                 /*  82 */ { "Agent Circuit ID",                                         opaque },
 215                 /*  83 */ { "Agent Remote ID",                                          opaque },
 216                 /*  84 */ { "Agent Subnet Mask",                                        opaque },
 217                 /*  85 */ { "Novell Directory Services Servers",        opaque },
 218                 /*  86 */ { "Novell Directory Services Tree Name",      opaque },
 219                 /*  87 */ { "Novell Directory Services Context",        opaque },
 220                 /*  88 */ { "IEEE 1003.1 POSIX Timezone",                       opaque },
 221                 /*  89 */ { "Fully Qualified Domain Name",                      opaque },
 222                 /*  90 */ { "Authentication",                                           opaque },
 223                 /*  91 */ { "Vines TCP/IP Server Option",                       opaque },
 224                 /*  92 */ { "Server Selection Option",                          opaque },
 225                 /*  93 */ { "Client System Architecture",                       opaque },
 226                 /*  94 */ { "Client Network Device Interface",          opaque },
 227                 /*  95 */ { "Lightweight Directory Access Protocol",    opaque },
 228                 /*  96 */ { "IPv6 Transitions",                                         opaque },
 229                 /*  97 */ { "UUID/GUID-based Client Identifier",        opaque },
 230                 /*  98 */ { "Open Group's User Authentication",         opaque },
 231                 /*  99 */ { "Unassigned",                                                       opaque },
 232                 /* 100 */ { "Printer Name",                                                     opaque },
 233                 /* 101 */ { "MDHCP multicast address",                          opaque },
 234                 /* 102 */ { "Removed/unassigned",                                       opaque },
 235                 /* 103 */ { "Removed/unassigned",                                       opaque },
 236                 /* 104 */ { "Removed/unassigned",                                       opaque },
 237                 /* 105 */ { "Removed/unassigned",                                       opaque },
 238                 /* 106 */ { "Removed/unassigned",                                       opaque },
 239                 /* 107 */ { "Removed/unassigned",                                       opaque },
 240                 /* 108 */ { "Swap Path Option",                                         opaque },
 241                 /* 109 */ { "Unassigned",                                                       opaque },
 242                 /* 110 */ { "IPX Compability",                                          opaque },
 243                 /* 111 */ { "Unassigned",                                                       opaque },
 244                 /* 112 */ { "Netinfo Parent Server Address",            opaque },
 245                 /* 113 */ { "Netinfo Parent Server Tag",                        opaque },
 246                 /* 114 */ { "URL",                                                                      opaque },
 247                 /* 115 */ { "DHCP Failover Protocol",                           opaque },
 248                 /* 116 */ { "DHCP Auto-Configuration",                          opaque },
 249                 /* 117 */ { "Unassigned",                                                       opaque },
 250                 /* 118 */ { "Unassigned",                                                       opaque },
 251                 /* 119 */ { "Unassigned",                                                       opaque },
 252                 /* 120 */ { "Unassigned",                                                       opaque },
 253                 /* 121 */ { "Unassigned",                                                       opaque },
 254                 /* 122 */ { "Unassigned",                                                       opaque },
 255                 /* 123 */ { "Unassigned",                                                       opaque },
 256                 /* 124 */ { "Unassigned",                                                       opaque },
 257                 /* 125 */ { "Unassigned",                                                       opaque },
 258                 /* 126 */ { "Extension",                                                        opaque },
 259                 /* 127 */ { "Extension",                                                        opaque }
 260         };
 261
 262         /* Options whose length isn't "vlen + 2". */
 263         switch (code) {
 264
 265         case 0:         /* Padding */
 266                 /* check how much padding we have */
 267                 for (i = voff + 1; i < eoff; i++ ) {
 268                         if (pd[i] != 0) {
 269                                 break;
 270                         }
 271                 }
 272                 i = i - voff;
 273                 if (bp_tree != NULL)
 274                         proto_tree_add_text(bp_tree, NullTVB, voff, i, "Padding");
 275                 consumed = i;
 276                 return consumed;
 277                 break;
 278
 279         case 255:       /* End Option */
 280                 if (bp_tree != NULL)
 281                         proto_tree_add_text(bp_tree, NullTVB, voff, 1, "End Option");
 282                 consumed = 1;
 283                 return consumed;
 284         }
 285
 286         if (bp_tree == NULL) {
 287                 /* Don't put anything in the protocol tree. */
 288                 return consumed;
 289         }
 290
 291         text = opt[code].text;
 292         /* Special cases */
 293         switch (code) {
 294
 295         case 21:        /* Policy Filter */
 296                 if (vlen == 8) {
 297                         /* one IP address pair */
 298                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 299                                 "Option %d: %s = %s/%s", code, text,
 300                                 ip_to_str((guint8*)&pd[voff+2]),
 301                                 ip_to_str((guint8*)&pd[voff+6]));
 302                 } else {
 303                         /* > 1 IP address pair. Let's make a sub-tree */
 304                         vti = proto_tree_add_text(bp_tree, NullTVB, voff,
 305                                 consumed, "Option %d: %s", code, text);
 306                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 307                         for (i = voff + 2; i < voff + consumed; i += 8) {
 308                                 proto_tree_add_text(v_tree, NullTVB, i, 8, "IP Address/Mask: %s/%s",
 309                                         ip_to_str((guint8*)&pd[i]),
 310                                         ip_to_str((guint8*)&pd[i+4]));
 311                         }
 312                 }
 313                 break;
 314
 315         case 33:        /* Static Route */
 316                 if (vlen == 8) {
 317                         /* one IP address pair */
 318                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 319                                 "Option %d: %s = %s/%s", code, text,
 320                                 ip_to_str((guint8*)&pd[voff+2]),
 321                                 ip_to_str((guint8*)&pd[voff+6]));
 322                 } else {
 323                         /* > 1 IP address pair. Let's make a sub-tree */
 324                         vti = proto_tree_add_text(bp_tree, NullTVB, voff,
 325                                 consumed, "Option %d: %s", code, text);
 326                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 327                         for (i = voff + 2; i < voff + consumed; i += 8) {
 328                                 proto_tree_add_text(v_tree, NullTVB, i, 8,
 329                                         "Destination IP Address/Router: %s/%s",
 330                                         ip_to_str((guint8*)&pd[i]),
 331                                         ip_to_str((guint8*)&pd[i+4]));
 332                         }
 333                 }
 334                 break;
 335
 336         case 43:        /* Vendor-Specific Info */
 337                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 338                                 "Option %d: %s", code, text);
 339                 break;
 340
 341         case 46:        /* NetBIOS-over-TCP/IP Node Type */
 342                 byte = pd[voff+2];
 343                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 344                                 "Option %d: %s = %s", code, text,
 345                                 val_to_str(byte, nbnt_vals,
 346                                     "Unknown (0x%02x)"));
 347                 break;
 348
 349         case 53:        /* DHCP Message Type */
 350                 proto_tree_add_text(bp_tree, NullTVB, voff, 3, "Option %d: %s = DHCP %s",
 351                         code, text, get_dhcp_type(pd[voff+2]));
 352                 break;
 353
 354         case 55:        /* Parameter Request List */
 355                 vti = proto_tree_add_text(bp_tree, NullTVB, voff,
 356                         vlen + 2, "Option %d: %s", code, text);
 357                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 358                 for (i = 0; i < vlen; i++) {
 359                         byte = pd[voff+2+i];
 360                         if (byte < NUM_OPT_INFOS) {
 361                                 proto_tree_add_text(v_tree, NullTVB, voff+2+i, 1, "%d = %s",
 362                                                 byte, opt[byte].text);
 363                         } else {
 364                                 proto_tree_add_text(vti, NullTVB, voff+2+i, 1,
 365                                         "Unknown Option Code: %d", byte);
 366                         }
 367                 }
 368                 break;
 369
 370         case 61:        /* Client Identifier */
 371                 /* We *MAY* use hwtype/hwaddr. If we have 7 bytes, I'll
 372                    guess that the first is the hwtype, and the last 6
 373                    are the hw addr */
 374                 if (vlen == 7) {
 375                         vti = proto_tree_add_text(bp_tree, NullTVB, voff,
 376                                 consumed, "Option %d: %s", code, text);
 377                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 378                         proto_tree_add_text(v_tree, NullTVB, voff+2, 1,
 379                                 "Hardware type: %s",
 380                                 arphrdtype_to_str(pd[voff+2],
 381                                         "Unknown (0x%02x)"));
 382                         proto_tree_add_text(v_tree, NullTVB, voff+3, 6,
 383                                 "Client hardware address: %s",
 384                                 arphrdaddr_to_str((guint8*)&pd[voff+3],
 385                                         6, pd[voff+2]));
 386                 } else {
 387                         /* otherwise, it's opaque data */
 388                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 389                                 "Option %d: %s (%d bytes)", code, text, vlen);
 390                 }
 391                 break;
 392
 393         case 63:        /* NetWare/IP options */
 394                 vti = proto_tree_add_text(bp_tree, NullTVB, voff,
 395                     consumed, "Option %d: %s", code, text);
 396                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 397
 398                 optp = voff+2;
 399                 while (optp < voff+consumed)
 400                         optp = dissect_netware_ip_suboption(v_tree, pd, optp);
 401                 break;
 402
 403         default:        /* not special */
 404                 break;
 405         }
 406
 407         /* Normal cases */
 408         if (code < NUM_OPT_INFOS) {
 409                 text = opt[code].text;
 410                 ftype = opt[code].ftype;
 411
 412                 switch (ftype) {
 413
 414                 case special:
 415                         return consumed;
 416
 417                 case ipv4:
 418                         if (vlen == 4) {
 419                                 /* one IP address */
 420                                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 421                                         "Option %d: %s = %s", code, text,
 422                                         ip_to_str((guint8*)&pd[voff+2]));
 423                         } else {
 424                                 /* > 1 IP addresses. Let's make a sub-tree */
 425                                 vti = proto_tree_add_text(bp_tree, NullTVB, voff,
 426                                         consumed, "Option %d: %s", code, text);
 427                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 428                                 for (i = voff + 2; i < voff + consumed; i += 4) {
 429                                         proto_tree_add_text(v_tree, NullTVB, i, 4, "IP Address: %s",
 430                                                 ip_to_str((guint8*)&pd[i]));
 431                                 }
 432                         }
 433                         break;
 434
 435                 case string:
 436                         /* Fix for non null-terminated string supplied by
 437                          * John Lines <John.Lines@aeat.co.uk>
 438                          */
 439                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 440                                         "Option %d: %s = %.*s", code, text, vlen, &pd[voff+2]);
 441                         break;
 442
 443                 case opaque:
 444                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 445                                         "Option %d: %s (%d bytes)",
 446                                         code, text, vlen);
 447                         break;
 448
 449                 case val_u_short:
 450                         if (vlen == 2) {
 451                                 /* one u_short */
 452                                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 453                                                 "Option %d: %s = %d", code, text,
 454                                                 pntohs(&pd[voff+2]));
 455                         } else {
 456                                 /* > 1 u_short */
 457                                 vti = proto_tree_add_text(bp_tree, NullTVB, voff,
 458                                         consumed, "Option %d: %s", code, text);
 459                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 460                                 for (i = voff + 2; i < voff + consumed; i += 2) {
 461                                         proto_tree_add_text(v_tree, NullTVB, i, 4, "Value: %d",
 462                                                 pntohs(&pd[i]));
 463                                 }
 464                         }
 465                         break;
 466
 467                 case val_u_long:
 468                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 469                                         "Option %d: %s = %d", code, text,
 470                                         pntohl(&pd[voff+2]));
 471                         break;
 472
 473                 case val_u_byte:
 474                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 475                                         "Option %d: %s = %d", code, text, pd[voff+2]);
 476                         break;
 477
 478                 case toggle:
 479                         i = pd[voff+2];
 480                         if (i != 0 && i != 1) {
 481                                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 482                                                 "Option %d: %s = Invalid Value %d", code, text,
 483                                                 pd[voff+2]);
 484                         } else {
 485                                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 486                                                 "Option %d: %s = %s", code, text,
 487                                                 pd[voff+2] == 0 ? "Disabled" : "Enabled");
 488                         }
 489                         break;
 490
 491                 case yes_no:
 492                         i = pd[voff+2];
 493                         if (i != 0 && i != 1) {
 494                                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 495                                                 "Option %d: %s = Invalid Value %d", code, text,
 496                                                 pd[voff+2]);
 497                         } else {
 498                                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 499                                                 "Option %d: %s = %s", code, text,
 500                                                 pd[voff+2] == 0 ? "No" : "Yes");
 501                         }
 502                         break;
 503
 504                 case time_in_secs:
 505                         time_secs = pntohl(&pd[voff+2]);
 506                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 507                                 "Option %d: %s = %s", code, text,
 508                                 ((time_secs == 0xffffffff) ?
 509                                     "infinity" :
 510                                     time_secs_to_str(time_secs)));
 511                         break;
 512
 513                 default:
 514                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 515                                         "Option %d: %s (%d bytes)", code, text, vlen);
 516                 }
 517         } else {
 518                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 519                                 "Unknown Option Code: %d (%d bytes)", code, vlen);
 520         }
 521
 522         return consumed;
 523 }
 524
 525 static int
 526 dissect_netware_ip_suboption(proto_tree *v_tree, const u_char *pd, int optp)
 527 {
 528         int slask;
 529         proto_tree *o63_v_tree;
 530         proto_item *vti;
 531
 532         struct o63_opt_info {
 533                 char    *truet;
 534                 char    *falset;
 535                 enum field_type ft;
 536         };
 537
 538         static struct o63_opt_info o63_opt[]= {
 539                 /* 0 */ {"","",none},
 540                 /* 1 */ {"NWIP does not exist on subnet","",string},
 541                 /* 2 */ {"NWIP exist in options area","",string},
 542                 /* 3 */ {"NWIP exists in sname/file","",string},
 543                 /* 4 */ {"NWIP exists, but too big","",string},
 544                 /* 5 */ {"Broadcast for nearest Netware server","Do NOT Broadcast for nearest Netware server",yes_no},
 545                 /* 6 */ {"Preferred DSS server","",ipv4},
 546                 /* 7 */ {"Nearest NWIP server","",ipv4},
 547                 /* 8 */ {"Autoretries","",val_u_short},
 548                 /* 9 */ {"Autoretry delay, secs ","",val_u_short},
 549                 /* 10*/ {"Support NetWare/IP v1.1","Do NOT support NetWare/IP v1.1",yes_no},
 550                 /* 11*/ {"Primary DSS ", "" , special}
 551         };
 552
 553         if (pd[optp] > NUM_O63_SUBOPTS) {
 554                 proto_tree_add_text(v_tree, NullTVB,optp,1,"Unknown suboption %d", pd[optp]);
 555                 optp++;
 556         } else {
 557                 switch (o63_opt[pd[optp]].ft) {
 558
 559                 case string:
 560                         proto_tree_add_text(v_tree, NullTVB, optp, 2, "Suboption %d: %s", pd[optp], o63_opt[pd[optp]].truet);
 561                         optp+=2;
 562                         break;
 563
 564                 case yes_no:
 565                         if (pd[optp+2]==1) {
 566                                 proto_tree_add_text(v_tree, NullTVB, optp, 3, "Suboption %d: %s", pd[optp], o63_opt[pd[optp]].truet);
 567                         } else {
 568                                 proto_tree_add_text(v_tree, NullTVB, optp, 3, "Suboption %d: %s" , pd[optp], o63_opt[pd[optp]].falset);
 569                         }
 570                         optp+=3;
 571                         break;
 572
 573                 case special:
 574                         proto_tree_add_text(v_tree, NullTVB, optp, 6,
 575                             "Suboption %d: %s = %s" ,
 576                             pd[optp], o63_opt[pd[optp]].truet,
 577                             ip_to_str((guint8*)&pd[optp+2]));
 578                         optp=optp+6;
 579                         break;
 580
 581                 case val_u_short:
 582                         proto_tree_add_text(v_tree, NullTVB, optp, 3, "Suboption %d: %s = %d",pd[optp], o63_opt[pd[optp]].truet, pd[optp+2]);
 583                         optp+=3;
 584                         break;
 585
 586                 case ipv4:
 587                         if (pd[optp+1] == 4) {
 588                                 /* one IP address */
 589                                 proto_tree_add_text(v_tree, NullTVB, optp, 6,
 590                                     "Suboption %d : %s = %s",
 591                                     pd[optp], o63_opt[pd[optp]].truet,
 592                                     ip_to_str((guint8*)&pd[optp+2]));
 593                                 optp=optp+6;
 594                         } else {
 595                                 /* > 1 IP addresses. Let's make a sub-tree */
 596                                 vti = proto_tree_add_text(v_tree, NullTVB, optp,
 597                                     pd[optp+1]+2, "Suboption %d: %s",
 598                                     pd[optp], o63_opt[pd[optp]].truet);
 599                                 o63_v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 600                                 for (slask = optp + 2 ; slask < optp+pd[optp+1]; slask += 4) {
 601                                         proto_tree_add_text(o63_v_tree, NullTVB, slask, 4, "IP Address: %s",
 602                                         ip_to_str((guint8*)&pd[slask]));
 603                                 }
 604                                 optp=slask;
 605                         }
 606                         break;
 607                 default:
 608                         proto_tree_add_text(v_tree, NullTVB,optp,1,"Unknown suboption %d", pd[optp]);
 609                         optp++;
 610                         break;
 611                 }
 612         }
 613         return optp;
 614 }
 615
 616 static void
 617 dissect_bootp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
 618 {
 619         proto_tree      *bp_tree = NULL;
 620         proto_item      *ti;
 621         int             voff, eoff; /* vender offset, end offset */
 622         guint32         ip_addr;
 623         const char      *dhcp_type;
 624
 625         OLD_CHECK_DISPLAY_AS_DATA(proto_bootp, pd, offset, fd, tree);
 626
 627         dhcp_type = NULL;
 628
 629         if (check_col(fd, COL_PROTOCOL))
 630                 col_add_str(fd, COL_PROTOCOL, "BOOTP");
 631
 632         if (check_col(fd, COL_INFO)) {
 633                 if (pd[offset] == 1) {
 634                         col_add_fstr(fd, COL_INFO, "Boot Request from %s",
 635                                 arphrdaddr_to_str((guint8*)&pd[offset+28],
 636                                         pd[offset+2], pd[offset+1]));
 637                 }
 638                 else {
 639                         col_add_str(fd, COL_INFO, "Boot Reply");
 640                 }
 641         }
 642
 643         if (tree) {
 644                 ti = proto_tree_add_item(tree, proto_bootp, NullTVB, offset, END_OF_FRAME, FALSE);
 645                 bp_tree = proto_item_add_subtree(ti, ett_bootp);
 646
 647                 proto_tree_add_uint_format(bp_tree, hf_bootp_type, NullTVB,
 648                                            offset, 1,
 649                                            pd[offset],
 650                                            pd[offset] == 1 ?
 651                                            "Boot Request" : "Boot Reply");
 652                 proto_tree_add_uint_format(bp_tree, hf_bootp_hw_type, NullTVB,
 653                                            offset + 1, 1,
 654                                            pd[offset+1],
 655                                            "Hardware type: %s",
 656                                            arphrdtype_to_str(pd[offset+1],
 657                                                              "Unknown (0x%02x)"));
 658                 proto_tree_add_uint(bp_tree, hf_bootp_hw_len, NullTVB,
 659                                     offset + 2, 1, pd[offset+2]);
 660                 proto_tree_add_uint(bp_tree, hf_bootp_hops, NullTVB,
 661                                     offset + 3, 1, pd[offset+3]);
 662                 proto_tree_add_uint(bp_tree, hf_bootp_id, NullTVB,
 663                                    offset + 4, 4, pntohl(&pd[offset+4]));
 664                 proto_tree_add_uint(bp_tree, hf_bootp_secs, NullTVB,
 665                                     offset + 8, 2, pntohs(&pd[offset+8]));
 666                 proto_tree_add_uint(bp_tree, hf_bootp_flag, NullTVB,
 667                                     offset + 10, 2, pntohs(&pd[offset+10]) & 0x8000);
 668
 669                 memcpy(&ip_addr, &pd[offset+12], sizeof(ip_addr));
 670                 proto_tree_add_ipv4(bp_tree, hf_bootp_ip_client, NullTVB,
 671                                     offset + 12, 4, ip_addr);
 672                 memcpy(&ip_addr, &pd[offset+16], sizeof(ip_addr));
 673                 proto_tree_add_ipv4(bp_tree, hf_bootp_ip_your, NullTVB,
 674                                     offset + 16, 4, ip_addr);
 675                 memcpy(&ip_addr, &pd[offset+20], sizeof(ip_addr));
 676                 proto_tree_add_ipv4(bp_tree, hf_bootp_ip_server, NullTVB,
 677                                     offset + 20, 4, ip_addr);
 678                 memcpy(&ip_addr, &pd[offset+24], sizeof(ip_addr));
 679                 proto_tree_add_ipv4(bp_tree, hf_bootp_ip_relay, NullTVB,
 680                                     offset + 24, 4, ip_addr);
 681
 682                 if (pd[offset+2] > 0) {
 683                         proto_tree_add_bytes_format(bp_tree, hf_bootp_hw_addr, NullTVB,
 684                                                    offset + 28, pd[offset+2],
 685                                                    &pd[offset+28],
 686                                                    "Client hardware address: %s",
 687                                                    arphrdaddr_to_str((guint8*)&pd[offset+28],
 688                                                                      pd[offset+2], pd[offset+1]));
 689                 }
 690                 else {
 691                         proto_tree_add_text(bp_tree,  NullTVB,
 692                                                    offset + 28, 0, "Client address not given");
 693                 }
 694
 695                 /* The server host name is optional */
 696                 if (pd[offset+44]) {
 697                         proto_tree_add_string_format(bp_tree, hf_bootp_server, NullTVB,
 698                                                    offset + 44, 64,
 699                                                    &pd[offset+44],
 700                                                    "Server host name: %s",
 701                                                    &pd[offset+44]);
 702                 }
 703                 else {
 704                         proto_tree_add_string_format(bp_tree, hf_bootp_server, NullTVB,
 705                                                    offset + 44, 64,
 706                                                    &pd[offset+44],
 707                                                    "Server host name not given");
 708                 }
 709
 710                 /* Boot file */
 711                 if (pd[offset+108]) {
 712                         proto_tree_add_string_format(bp_tree, hf_bootp_file, NullTVB,
 713                                                    offset + 108, 128,
 714                                                    &pd[offset+108],
 715                                                    "Boot file name: %s",
 716                                                    &pd[offset+108]);
 717                 }
 718                 else {
 719                         proto_tree_add_string_format(bp_tree, hf_bootp_file, NullTVB,
 720                                                    offset + 108, 128,
 721                                                    &pd[offset+108],
 722                                                    "Boot file name not given");
 723                 }
 724
 725                 memcpy(&ip_addr, &pd[offset + 236], sizeof(ip_addr));
 726                 if (pntohl(&pd[offset+236]) == 0x63825363) {
 727                         proto_tree_add_ipv4_format(bp_tree, hf_bootp_cookie, NullTVB,
 728                                             offset + 236, 4, ip_addr,
 729                                             "Magic cookie: (OK)");
 730                 }
 731                 else {
 732                         proto_tree_add_ipv4(bp_tree, hf_bootp_cookie, NullTVB,
 733                                             offset + 236, 4, ip_addr);
 734                 }
 735         }
 736
 737         voff = offset+240;
 738         eoff = pi.captured_len;
 739         while (voff < eoff) {
 740                 /* Handle the DHCP option specially here, so that we
 741                    can flag DHCP packets as such. */
 742                 if (pd[voff] == 53)
 743                         dhcp_type = get_dhcp_type(pd[voff+2]);
 744                 voff += bootp_option(pd, bp_tree, voff, eoff);
 745         }
 746         if (dhcp_type != NULL ) {
 747                 if (check_col(fd, COL_PROTOCOL))
 748                         col_add_str(fd, COL_PROTOCOL, "DHCP");
 749                 if (check_col(fd, COL_INFO))
 750                         col_add_fstr(fd, COL_INFO, "DHCP %-8s - Transaction ID 0x%x",
 751                             dhcp_type, pntohl(&pd[offset+4]));
 752                 if (tree)
 753                         proto_tree_add_boolean_hidden(bp_tree, hf_bootp_dhcp,
 754                             NullTVB, 0, 0, 1);
 755         }
 756 }
 757
 758 void
 759 proto_register_bootp(void)
 760 {
 761   static hf_register_info hf[] = {
 762     { &hf_bootp_dhcp,
 763       { "Frame is DHCP",                "bootp.dhcp",    FT_BOOLEAN,  BASE_NONE, NULL, 0x0,
 764         "" }},
 765
 766     { &hf_bootp_type,
 767       { "Message type",                 "bootp.type",    FT_UINT8,  BASE_NONE, NULL, 0x0,
 768         "" }},
 769
 770     { &hf_bootp_hw_type,
 771       { "Hardware type",                "bootp.hw.type", FT_UINT8,  BASE_HEX, NULL, 0x0,
 772         "" }},
 773
 774     { &hf_bootp_hw_len,
 775       { "Hardware address length",      "bootp.hw.len",  FT_UINT8,  BASE_DEC, NULL, 0x0,
 776         "" }},
 777
 778     { &hf_bootp_hops,
 779       { "Hops",                         "bootp.hops",    FT_UINT8,  BASE_DEC, NULL, 0x0,
 780         "" }},
 781
 782     { &hf_bootp_id,
 783       { "Transaction ID",               "bootp.id",      FT_UINT32, BASE_HEX, NULL, 0x0,
 784         "" }},
 785
 786     { &hf_bootp_secs,
 787       { "Seconds elapsed",              "bootp.secs",    FT_UINT16, BASE_DEC, NULL, 0x0,
 788         "" }},
 789
 790     { &hf_bootp_flag,
 791       { "Broadcast flag",               "bootp.flag",    FT_UINT16, BASE_HEX, NULL, 0x0,
 792         "" }},
 793
 794     { &hf_bootp_ip_client,
 795       { "Client IP address",            "bootp.ip.client",FT_IPv4,  BASE_NONE, NULL, 0x0,
 796         "" }},
 797
 798     { &hf_bootp_ip_your,
 799       { "Your (client) IP address",     "bootp.ip.your",  FT_IPv4,  BASE_NONE, NULL, 0x0,
 800         "" }},
 801
 802     { &hf_bootp_ip_server,
 803       { "Next server IP address",       "bootp.ip.server",FT_IPv4,  BASE_NONE, NULL, 0x0,
 804         "" }},
 805
 806     { &hf_bootp_ip_relay,
 807       { "Relay agent IP address",       "bootp.ip.relay", FT_IPv4,  BASE_NONE, NULL, 0x0,
 808         "" }},
 809
 810     { &hf_bootp_hw_addr,
 811       { "Client hardware address",      "bootp.hw.addr", FT_BYTES,  BASE_NONE, NULL, 0x0,
 812         "" }},
 813
 814     { &hf_bootp_server,
 815       { "Server host name",             "bootp.server",  FT_STRING, BASE_NONE, NULL, 0x0,
 816         "" }},
 817
 818     { &hf_bootp_file,
 819       { "Boot file name",               "bootp.file",    FT_STRING, BASE_NONE, NULL, 0x0,
 820         "" }},
 821
 822     { &hf_bootp_cookie,
 823       { "Magic cookie",                 "bootp.cookie",  FT_IPv4,   BASE_NONE, NULL, 0x0,
 824         "" }},
 825   };
 826   static gint *ett[] = {
 827     &ett_bootp,
 828     &ett_bootp_option,
 829   };
 830
 831   proto_bootp = proto_register_protocol("Bootstrap Protocol", "bootp");
 832   proto_register_field_array(proto_bootp, hf, array_length(hf));
 833   proto_register_subtree_array(ett, array_length(ett));
 834 }
 835
 836 void
 837 proto_reg_handoff_bootp(void)
 838 {
 839   old_dissector_add("udp.port", UDP_PORT_BOOTPS, dissect_bootp);
 840 }