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 1.34 2000/05/31 05:06:54 guy Exp $
   6  *
   7  * The information used comes from:
   8  * RFC 2132: DHCP Options and BOOTP Vendor Extensions
   9  * RFC 1542: Clarifications and Extensions for the Bootstrap Protocol
  10  * RFC 2131: Dynamic Host Configuration Protocol
  11  *
  12  * Ethereal - Network traffic analyzer
  13  * By Gerald Combs <gerald@zing.org>
  14  * Copyright 1998 Gerald Combs
  15  *
  16  *
  17  * This program is free software; you can redistribute it and/or
  18  * modify it under the terms of the GNU General Public License
  19  * as published by the Free Software Foundation; either version 2
  20  * of the License, or (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  30  */
  31
  32 #ifdef HAVE_CONFIG_H
  33 # include "config.h"
  34 #endif
  35
  36 #ifdef HAVE_SYS_TYPES_H
  37 # include <sys/types.h>
  38 #endif
  39
  40 #include <glib.h>
  41 #include "packet.h"
  42 #include "packet-arp.h"
  43
  44 static int proto_bootp = -1;
  45 static int hf_bootp_type = -1;
  46 static int hf_bootp_hw_type = -1;
  47 static int hf_bootp_hw_len = -1;
  48 static int hf_bootp_hops = -1;
  49 static int hf_bootp_id = -1;
  50 static int hf_bootp_secs = -1;
  51 static int hf_bootp_flag = -1;
  52 static int hf_bootp_ip_client = -1;
  53 static int hf_bootp_ip_your = -1;
  54 static int hf_bootp_ip_server = -1;
  55 static int hf_bootp_ip_relay = -1;
  56 static int hf_bootp_hw_addr = -1;
  57 static int hf_bootp_server = -1;
  58 static int hf_bootp_file = -1;
  59 static int hf_bootp_cookie = -1;
  60 static int hf_bootp_dhcp = -1;
  61
  62 static guint ett_bootp = -1;
  63 static guint ett_bootp_option = -1;
  64
  65 static char * is_dhcp ;
  66
  67 #define UDP_PORT_BOOTPS  67
  68
  69 enum field_type { none, ipv4, string, toggle, yes_no, special, opaque,
  70         time_in_secs,
  71         val_u_byte, val_u_short, val_u_long,
  72         val_s_long };
  73
  74 struct opt_info {
  75         char    *text;
  76         enum field_type ftype;
  77 };
  78
  79 #define NUM_OPT_INFOS 77
  80 #define NUM_O63_SUBOPTS 11
  81
  82 /* returns the number of bytes consumed by this option */
  83 static int
  84 bootp_option(const u_char *pd, proto_tree *bp_tree, int voff, int eoff)
  85 {
  86         char                    *text;
  87         enum field_type ftype;
  88         u_char                  code = pd[voff];
  89         int                             vlen = pd[voff+1];
  90         u_char                  byte;
  91         int                             i,slask,optp, consumed = vlen + 2;
  92         u_long                  time_secs;
  93         proto_tree              *v_tree,*o63_v_tree;
  94         proto_item              *vti;
  95
  96
  97         static const char       *opt53_text[] = {
  98                 "Unknown Message Type",
  99                 "Discover",
 100                 "Offer",
 101                 "Request",
 102                 "Decline",
 103                 "ACK",
 104                 "NAK",
 105                 "Release",
 106                 "Inform"
 107         };
 108         static const value_string nbnt_vals[] = {
 109             {0x1,   "B-node" },
 110             {0x2,   "P-node" },
 111             {0x4,   "M-node" },
 112             {0x8,   "H-node" },
 113             {0,     NULL     } };
 114
 115         struct o63_opt_info {
 116                 char    *truet;
 117                 char    *falset;
 118                 enum field_type ft;
 119         };
 120
 121         static struct o63_opt_info o63_opt[]= {
 122                 /* 0 */ {"","",none},
 123                 /* 1 */ {"NWIP does not exist on subnet","",string},
 124                 /* 2 */ {"NWIP exist in options area","",string},
 125                 /* 3 */ {"NWIP exists in sname/file","",string},
 126                 /* 4 */ {"NWIP exists, but too big","",string},
 127                 /* 5 */ {"Broadcast for nearest Netware server","Do NOT Broadcast for nearest Netware server",yes_no},
 128                 /* 6 */ {"Preferred DSS server","",ipv4},
 129                 /* 7 */ {"Nearest NWIP server","",ipv4},
 130                 /* 8 */ {"Autoretries","",val_u_short},
 131                 /* 9 */ {"Autoretry delay, secs ","",val_u_short},
 132                 /* 10*/ {"Support NetWare/IP v1.1","Do NOT support NetWare/IP v1.1",yes_no},
 133                 /* 11*/ {"Primary DSS ", "" , special} };
 134
 135
 136         static struct opt_info opt[] = {
 137                 /*   0 */ { "Padding",                                                          none },
 138                 /*   1 */ { "Subnet Mask",                                                      ipv4 },
 139                 /*   2 */ { "Time Offset",                                                      val_s_long },
 140                 /*   3 */ { "Router",                                                           ipv4 },
 141                 /*   4 */ { "Time Server",                                                      ipv4 },
 142                 /*   5 */ { "Name Server",                                                      ipv4 },
 143                 /*   6 */ { "Domain Name Server",                                       ipv4 },
 144                 /*   7 */ { "Log Server",                                                       ipv4 },
 145                 /*   8 */ { "Cookie Server",                                            ipv4 },
 146                 /*   9 */ { "LPR Server",                                                       ipv4 },
 147                 /*  10 */ { "Impress Server",                                           ipv4 },
 148                 /*  11 */ { "Resource Location Server",                         ipv4 },
 149                 /*  12 */ { "Host Name",                                                        string },
 150                 /*  13 */ { "Boot File Size",                                           val_u_short },
 151                 /*  14 */ { "Merit Dump File",                                          string },
 152                 /*  15 */ { "Domain Name",                                                      string },
 153                 /*  16 */ { "Swap Server",                                                      ipv4 },
 154                 /*  17 */ { "Root Path",                                                        string },
 155                 /*  18 */ { "Extensions Path",                                          string },
 156                 /*  19 */ { "IP Forwarding",                                            toggle },
 157                 /*  20 */ { "Non-Local Source Routing",                         toggle },
 158                 /*  21 */ { "Policy Filter",                                            special },
 159                 /*  22 */ { "Maximum Datagram Reassembly Size",         val_u_short },
 160                 /*  23 */ { "Default IP Time-to-Live",                          val_u_byte },
 161                 /*  24 */ { "Path MTU Aging Timeout",                           time_in_secs },
 162                 /*  25 */ { "Path MTU Plateau Table",                           val_u_short },
 163                 /*  26 */ { "Interface MTU",                                            val_u_short },
 164                 /*  27 */ { "All Subnets are Local",                            yes_no },
 165                 /*  28 */ { "Broadcast Address",                                        ipv4 },
 166                 /*  29 */ { "Perform Mask Discovery",                           toggle },
 167                 /*  30 */ { "Mask Supplier",                                            yes_no },
 168                 /*  31 */ { "Perform Router Discover",                          toggle },
 169                 /*  32 */ { "Router Solicitation Address",                      ipv4 },
 170                 /*  33 */ { "Static Route",                                                     special },
 171                 /*  34 */ { "Trailer Encapsulation",                            toggle },
 172                 /*  35 */ { "ARP Cache Timeout",                                        time_in_secs },
 173                 /*  36 */ { "Ethernet Encapsulation",                           toggle },
 174                 /*  37 */ { "TCP Default TTL",                                          val_u_byte },
 175                 /*  38 */ { "TCP Keepalive Interval",                           time_in_secs },
 176                 /*  39 */ { "TCP Keepalive Garbage",                            toggle },
 177                 /*  40 */ { "Network Information Service Domain",       string },
 178                 /*  41 */ { "Network Information Service Servers",      ipv4 },
 179                 /*  42 */ { "Network Time Protocol Servers",            ipv4 },
 180                 /*  43 */ { "Vendor-Specific Information",                      special },
 181                 /*  44 */ { "NetBIOS over TCP/IP Name Server",          ipv4 },
 182                 /*  45 */ { "NetBIOS over TCP/IP Datagram Distribution Name Server", ipv4 },
 183                 /*  46 */ { "NetBIOS over TCP/IP Node Type",            special },
 184                 /*  47 */ { "NetBIOS over TCP/IP Scope",                        string },
 185                 /*  48 */ { "X Window System Font Server",                      ipv4 },
 186                 /*  49 */ { "X Window System Display Manager",          ipv4 },
 187                 /*  50 */ { "Requested IP Address",                                     ipv4 },
 188                 /*  51 */ { "IP Address Lease Time",                            time_in_secs },
 189                 /*  52 */ { "Option Overload",                                          special },
 190                 /*  53 */ { "DHCP Message Type",                                        special },
 191                 /*  54 */ { "Server Identifier",                                        ipv4 },
 192                 /*  55 */ { "Parameter Request List",                           special },
 193                 /*  56 */ { "Message",                                                          string },
 194                 /*  57 */ { "Maximum DHCP Message Size",                        val_u_short },
 195                 /*  58 */ { "Renewal Time Value",                                       time_in_secs },
 196                 /*  59 */ { "Rebinding Time Value",                                     time_in_secs },
 197                 /*  60 */ { "Vendor class identifier",                          opaque },
 198                 /*  61 */ { "Client identifier",                                        special },
 199                 /*  62 */ { "Novell/Netware IP domain",                                 string },
 200                 /*  63 */ { "Novell Options",   special },
 201                 /*  64 */ { "Network Information Service+ Domain",      string },
 202                 /*  65 */ { "Network Information Service+ Servers",     ipv4 },
 203                 /*  66 */ { "TFTP Server Name",                                         string },
 204                 /*  67 */ { "Bootfile name",                                            string },
 205                 /*  68 */ { "Mobile IP Home Agent",                                     ipv4 },
 206                 /*  69 */ { "SMTP Server",                                                      ipv4 },
 207                 /*  70 */ { "POP3 Server",                                                      ipv4 },
 208                 /*  71 */ { "NNTP Server",                                                      ipv4 },
 209                 /*  72 */ { "Default WWW Server",                                       ipv4 },
 210                 /*  73 */ { "Default Finger Server",                            ipv4 },
 211                 /*  74 */ { "Default IRC Server",                                       ipv4 },
 212                 /*  75 */ { "StreetTalk Server",                                        ipv4 },
 213                 /*  76 */ { "StreetTalk Directory Assistance Server", ipv4 }
 214         };
 215
 216         text = opt[code].text;
 217         /* Special cases */
 218         switch (code) {
 219                 /* Padding */
 220                 case 0:
 221                         /* check how much padding we have */
 222                         for (i = voff + 1; i < eoff; i++ ) {
 223                                 if (pd[i] != 0) {
 224                                         break;
 225                                 }
 226                         }
 227                         i = i - voff;
 228                         proto_tree_add_text(bp_tree, NullTVB, voff, i, "Padding");
 229                         consumed = i;
 230                         return consumed;
 231
 232                 /* Policy Filter */
 233                 case 21:
 234                         /* one IP address pair */
 235                         if (vlen == 8) {
 236                                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 237                                         "Option %d: %s = %s/%s", code, text,
 238                                         ip_to_str((guint8*)&pd[voff+2]),
 239                                         ip_to_str((guint8*)&pd[voff+6]));
 240                         }
 241                         /* > 1 IP address pair. Let's make a sub-tree */
 242                         else {
 243
 244                                 vti = proto_tree_add_text(bp_tree, NullTVB, voff,
 245                                         consumed, "Option %d: %s", code, text);
 246                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 247                                 for (i = voff + 2; i < voff + consumed; i += 8) {
 248                                         proto_tree_add_text(v_tree, NullTVB, i, 8, "IP Address/Mask: %s/%s",
 249                                                 ip_to_str((guint8*)&pd[i]),
 250                                                 ip_to_str((guint8*)&pd[i+4]));
 251                                 }
 252                         }
 253                         break;
 254
 255                 /* Static Route */
 256                 case 33:
 257                         /* one IP address pair */
 258                         if (vlen == 8) {
 259                                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 260                                         "Option %d: %s = %s/%s", code, text,
 261                                         ip_to_str((guint8*)&pd[voff+2]),
 262                                         ip_to_str((guint8*)&pd[voff+6]));
 263                         }
 264                         /* > 1 IP address pair. Let's make a sub-tree */
 265                         else {
 266
 267                                 vti = proto_tree_add_text(bp_tree, NullTVB, voff,
 268                                         consumed, "Option %d: %s", code, text);
 269                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 270                                 for (i = voff + 2; i < voff + consumed; i += 8) {
 271                                         proto_tree_add_text(v_tree, NullTVB, i, 8,
 272                                                 "Destination IP Address/Router: %s/%s",
 273                                                 ip_to_str((guint8*)&pd[i]),
 274                                                 ip_to_str((guint8*)&pd[i+4]));
 275                                 }
 276                         }
 277                         break;
 278
 279                 /* Vendor-Specific Info */
 280                 case 43:
 281                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 282                                         "Option %d: %s", code, text);
 283                         break;
 284
 285                 /* NetBIOS-over-TCP/IP Node Type */
 286                 case 46:
 287                         byte = pd[voff+2];
 288                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 289                                         "Option %d: %s = %s", code, text,
 290                                         val_to_str(byte, nbnt_vals,
 291                                             "Unknown (0x%02x)"));
 292                         break;
 293
 294                 /* DHCP Message Type */
 295                 case 53:
 296                         byte = pd[voff+2];
 297                         if (byte > 0 && byte < 9) {
 298                                 i = byte;
 299                         }
 300                         else {
 301                                 i = 0;
 302                         }
 303                         proto_tree_add_text(bp_tree, NullTVB, voff, 3, "Option %d: %s = DHCP %s",
 304                                 code, text, opt53_text[i]);
 305                         is_dhcp = (char *) opt53_text[i];
 306                         break;
 307
 308                 /* Parameter Request List */
 309                 case 55:
 310                         vti = proto_tree_add_text(bp_tree, NullTVB, voff,
 311                                 vlen + 2, "Option %d: %s", code, text);
 312                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 313                         for (i = 0; i < vlen; i++) {
 314                                 byte = pd[voff+2+i];
 315                                 if (byte < NUM_OPT_INFOS) {
 316                                         proto_tree_add_text(v_tree, NullTVB, voff+2+i, 1, "%d = %s",
 317                                                         byte, opt[byte].text);
 318                                 }
 319                                 else {
 320                                         proto_tree_add_text(vti, NullTVB, voff+2+i, 1,
 321                                                 "Unknown Option Code: %d", byte);
 322                                 }
 323                         }
 324                         break;
 325
 326                 /* Client Identifier */
 327                 case 61:
 328                         /* We *MAY* use hwtype/hwaddr. If we have 7 bytes, I'll
 329                                 guess that the first is the hwtype, and the last 6 are
 330                                 the hw addr */
 331                         if (vlen == 7) {
 332                                 vti = proto_tree_add_text(bp_tree, NullTVB, voff,
 333                                         consumed, "Option %d: %s", code, text);
 334                                 v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 335                                 proto_tree_add_text(v_tree, NullTVB, voff+2, 1,
 336                                         "Hardware type: %s",
 337                                         arphrdtype_to_str(pd[voff+2],
 338                                                 "Unknown (0x%02x)"));
 339                                 proto_tree_add_text(v_tree, NullTVB, voff+3, 6,
 340                                         "Client hardware address: %s",
 341                                         arphrdaddr_to_str((guint8*)&pd[voff+3],
 342                                                 6, pd[voff+2]));
 343                         }
 344                         /* otherwise, it's opaque data */
 345                         else {
 346                                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 347                                         "Option %d: %s (%d bytes)", code, text, vlen);
 348                         }
 349                         break;
 350
 351                 /* NetWare/IP options */
 352                 case 63:
 353                         vti = proto_tree_add_text(bp_tree, NullTVB, voff,
 354                         consumed, "Option %d: %s", code, text);
 355                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 356
 357                         i=1;
 358                         optp=voff+2;
 359                         while ( optp < (voff+consumed) ) {
 360                                 if (pd[optp] > NUM_O63_SUBOPTS) {
 361                                                 proto_tree_add_text(v_tree, NullTVB,optp,1,"Unknown suboption %d", pd[optp]);
 362                                                 optp++;
 363                                 } else {
 364
 365                                 switch (o63_opt[pd[optp]].ft) {
 366
 367                                         case string:
 368                                                 proto_tree_add_text(v_tree, NullTVB, optp, 2, "Suboption %d: %s", pd[optp], o63_opt[pd[optp]].truet);
 369                                                 optp+=2;
 370                                                 break;
 371
 372                                         case yes_no:
 373                                                 if (pd[optp+2]==1) {
 374                                                         proto_tree_add_text(v_tree, NullTVB, optp, 3, "Suboption %d: %s", pd[optp], o63_opt[pd[optp]].truet);
 375                                                 } else {
 376                                                         proto_tree_add_text(v_tree, NullTVB, optp, 3, "Suboption %d: %s" , pd[optp], o63_opt[pd[optp]].falset);
 377                                                 }
 378                                                 optp+=3;
 379                                                 break;
 380
 381                                         case special:
 382                                                 proto_tree_add_text(v_tree, NullTVB, optp, 6,
 383                                                 "Suboption %d: %s = %s" ,
 384                                                 pd[optp], o63_opt[pd[optp]].truet,
 385                                                 ip_to_str((guint8*)&pd[optp+2]));
 386                                                 optp=optp+6;
 387                                                 break;
 388
 389                                         case val_u_short:
 390                                                 proto_tree_add_text(v_tree, NullTVB, optp, 3, "Suboption %d: %s = %d",pd[optp], o63_opt[pd[optp]].truet, pd[optp+2]);
 391                                                 optp+=3;
 392                                                 break;
 393
 394                                         case ipv4:
 395                 /* one IP address */
 396                 if (pd[optp+1] == 4) {
 397                         proto_tree_add_text(v_tree, NullTVB, optp, 6,
 398                         "Suboption %d : %s = %s" ,
 399                         pd[optp], o63_opt[pd[optp]].truet,
 400                         ip_to_str((guint8*)&pd[optp+2]));
 401                         optp=optp+6;
 402                 }
 403                 /* > 1 IP addresses. Let's make a sub-tree */
 404                 else {
 405
 406                         vti = proto_tree_add_text(v_tree, NullTVB, optp,
 407                         pd[optp+1]+2, "Suboption %d: %s",
 408                         pd[optp], o63_opt[pd[optp]].truet);
 409                         o63_v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 410                         for (slask = optp + 2 ; slask < optp+pd[optp+1]; slask += 4) {
 411                                 proto_tree_add_text(o63_v_tree, NullTVB, slask, 4, "IP Address: %s",
 412                                 ip_to_str((guint8*)&pd[slask]));
 413                         }
 414                         optp=slask;
 415                 }
 416                 break;
 417                                         default:
 418                                                 proto_tree_add_text(v_tree, NullTVB,optp,1,"Unknown suboption %d", pd[optp]);
 419                                                 optp++;
 420                                                 break;
 421                                 }
 422                                 }
 423                                 i++;
 424                         }
 425                         break;
 426
 427                 /* End Option */
 428                 case 255:
 429                         proto_tree_add_text(bp_tree, NullTVB, voff, 1, "End Option");
 430                         consumed = 1;
 431                         return consumed;
 432
 433                 default:
 434                         /* nothing */
 435                         break;
 436         }
 437
 438         /* Normal cases */
 439         if (code < NUM_OPT_INFOS) {
 440                 text = opt[code].text;
 441                 ftype = opt[code].ftype;
 442
 443                 switch (ftype) {
 444                         case special:
 445                                 return consumed;
 446
 447                         case ipv4:
 448                                 /* one IP address */
 449                                 if (vlen == 4) {
 450                                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 451                                                 "Option %d: %s = %s", code, text,
 452                                                 ip_to_str((guint8*)&pd[voff+2]));
 453                                 }
 454                                 /* > 1 IP addresses. Let's make a sub-tree */
 455                                 else {
 456
 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 += 4) {
 461                                                 proto_tree_add_text(v_tree, NullTVB, i, 4, "IP Address: %s",
 462                                                         ip_to_str((guint8*)&pd[i]));
 463                                         }
 464                                 }
 465                                 break;
 466
 467                         case string:
 468                                 /* Fix for non null-terminated string supplied by
 469                                  * John Lines <John.Lines@aeat.co.uk>
 470                                  */
 471                                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 472                                                 "Option %d: %s = %.*s", code, text, vlen, &pd[voff+2]);
 473                                 break;
 474
 475                         case opaque:
 476                                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 477                                                 "Option %d: %s (%d bytes)",
 478                                                 code, text, vlen);
 479                                 break;
 480
 481                         case val_u_short:
 482                                 /* one IP address */
 483                                 if (vlen == 2) {
 484                                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 485                                                         "Option %d: %s = %d", code, text,
 486                                                         pntohs(&pd[voff+2]));
 487                                 }
 488                                 /* > 1 u_short */
 489                                 else {
 490                                         vti = proto_tree_add_text(bp_tree, NullTVB, voff,
 491                                                 consumed, "Option %d: %s", code, text);
 492                                         v_tree = proto_item_add_subtree(vti, ett_bootp_option);
 493                                         for (i = voff + 2; i < voff + consumed; i += 2) {
 494                                                 proto_tree_add_text(v_tree, NullTVB, i, 4, "Value: %d",
 495                                                         pntohs(&pd[i]));
 496                                         }
 497                                 }
 498                                 break;
 499
 500                         case val_u_long:
 501                                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 502                                                 "Option %d: %s = %d", code, text,
 503                                                 pntohl(&pd[voff+2]));
 504                                 break;
 505
 506                         case val_u_byte:
 507                                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 508                                                 "Option %d: %s = %d", code, text, pd[voff+2]);
 509                                 break;
 510
 511                         case toggle:
 512                                 i = pd[voff+2];
 513                                 if (i != 0 && i != 1) {
 514                                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 515                                                         "Option %d: %s = Invalid Value %d", code, text,
 516                                                         pd[voff+2]);
 517                                 }
 518                                 else {
 519                                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 520                                                         "Option %d: %s = %s", code, text,
 521                                                         pd[voff+2] == 0 ? "Disabled" : "Enabled");
 522                                 }
 523                                 break;
 524
 525                         case yes_no:
 526                                 i = pd[voff+2];
 527                                 if (i != 0 && i != 1) {
 528                                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 529                                                         "Option %d: %s = Invalid Value %d", code, text,
 530                                                         pd[voff+2]);
 531                                 }
 532                                 else {
 533                                         proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 534                                                         "Option %d: %s = %s", code, text,
 535                                                         pd[voff+2] == 0 ? "No" : "Yes");
 536                                 }
 537                                 break;
 538
 539                         case time_in_secs:
 540                                 time_secs = pntohl(&pd[voff+2]);
 541                                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 542                                         "Option %d: %s = %s", code, text,
 543                                         ((time_secs == 0xffffffff) ?
 544                                             "infinity" :
 545                                             time_secs_to_str(time_secs)));
 546                                 break;
 547
 548                         default:
 549                                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 550                                                 "Option %d: %s (%d bytes)", code, text, vlen);
 551                 }
 552         }
 553         else {
 554                 proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
 555                                 "Unknown Option Code: %d (%d bytes)", code, vlen);
 556         }
 557
 558         return consumed;
 559 }
 560
 561 static void
 562 dissect_bootp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
 563 {
 564         proto_tree      *bp_tree;
 565         proto_item      *ti;
 566         int                     voff, eoff; /* vender offset, end offset */
 567         guint32         ip_addr;
 568
 569         is_dhcp = NULL;
 570
 571         if (check_col(fd, COL_PROTOCOL))
 572                 col_add_str(fd, COL_PROTOCOL, "BOOTP");
 573
 574         if (check_col(fd, COL_INFO)) {
 575                 if (pd[offset] == 1) {
 576                         col_add_fstr(fd, COL_INFO, "Boot Request from %s",
 577                                 arphrdaddr_to_str((guint8*)&pd[offset+28],
 578                                         pd[offset+2], pd[offset+1]));
 579                 }
 580                 else {
 581                         col_add_str(fd, COL_INFO, "Boot Reply");
 582                 }
 583         }
 584
 585         if (tree) {
 586                 ti = proto_tree_add_item(tree, proto_bootp, NullTVB, offset, END_OF_FRAME, FALSE);
 587                 bp_tree = proto_item_add_subtree(ti, ett_bootp);
 588
 589                 proto_tree_add_uint_format(bp_tree, hf_bootp_type, NullTVB,
 590                                            offset, 1,
 591                                            pd[offset],
 592                                            pd[offset] == 1 ?
 593                                            "Boot Request" : "Boot Reply");
 594                 proto_tree_add_uint_format(bp_tree, hf_bootp_hw_type, NullTVB,
 595                                            offset + 1, 1,
 596                                            pd[offset+1],
 597                                            "Hardware type: %s",
 598                                            arphrdtype_to_str(pd[offset+1],
 599                                                              "Unknown (0x%02x)"));
 600                 proto_tree_add_uint(bp_tree, hf_bootp_hw_len, NullTVB,
 601                                     offset + 2, 1, pd[offset+2]);
 602                 proto_tree_add_uint(bp_tree, hf_bootp_hops, NullTVB,
 603                                     offset + 3, 1, pd[offset+3]);
 604                 proto_tree_add_uint(bp_tree, hf_bootp_id, NullTVB,
 605                                    offset + 4, 4, pntohl(&pd[offset+4]));
 606                 proto_tree_add_uint(bp_tree, hf_bootp_secs, NullTVB,
 607                                     offset + 8, 2, pntohs(&pd[offset+8]));
 608                 proto_tree_add_uint(bp_tree, hf_bootp_flag, NullTVB,
 609                                     offset + 10, 2, pntohs(&pd[offset+10]) & 0x8000);
 610
 611                 memcpy(&ip_addr, &pd[offset+12], sizeof(ip_addr));
 612                 proto_tree_add_ipv4(bp_tree, hf_bootp_ip_client, NullTVB,
 613                                     offset + 12, 4, ip_addr);
 614                 memcpy(&ip_addr, &pd[offset+16], sizeof(ip_addr));
 615                 proto_tree_add_ipv4(bp_tree, hf_bootp_ip_your, NullTVB,
 616                                     offset + 16, 4, ip_addr);
 617                 memcpy(&ip_addr, &pd[offset+20], sizeof(ip_addr));
 618                 proto_tree_add_ipv4(bp_tree, hf_bootp_ip_server, NullTVB,
 619                                     offset + 20, 4, ip_addr);
 620                 memcpy(&ip_addr, &pd[offset+24], sizeof(ip_addr));
 621                 proto_tree_add_ipv4(bp_tree, hf_bootp_ip_relay, NullTVB,
 622                                     offset + 24, 4, ip_addr);
 623
 624                 if (pd[offset+2] > 0) {
 625                         proto_tree_add_bytes_format(bp_tree, hf_bootp_hw_addr, NullTVB,
 626                                                    offset + 28, pd[offset+2],
 627                                                    &pd[offset+28],
 628                                                    "Client hardware address: %s",
 629                                                    arphrdaddr_to_str((guint8*)&pd[offset+28],
 630                                                                      pd[offset+2], pd[offset+1]));
 631                 }
 632                 else {
 633                         proto_tree_add_bytes(bp_tree, hf_bootp_hw_addr, NullTVB,
 634                                                    offset + 28, 0, NULL);
 635                 }
 636
 637                 /* The server host name is optional */
 638                 if (pd[offset+44]) {
 639                         proto_tree_add_string_format(bp_tree, hf_bootp_server, NullTVB,
 640                                                    offset + 44, 64,
 641                                                    &pd[offset+44],
 642                                                    "Server host name: %s",
 643                                                    &pd[offset+44]);
 644                 }
 645                 else {
 646                         proto_tree_add_string_format(bp_tree, hf_bootp_server, NullTVB,
 647                                                    offset + 44, 64,
 648                                                    &pd[offset+44],
 649                                                    "Server host name not given");
 650                 }
 651
 652                 /* Boot file */
 653                 if (pd[offset+108]) {
 654                         proto_tree_add_string_format(bp_tree, hf_bootp_file, NullTVB,
 655                                                    offset + 108, 128,
 656                                                    &pd[offset+108],
 657                                                    "Boot file name: %s",
 658                                                    &pd[offset+108]);
 659                 }
 660                 else {
 661                         proto_tree_add_string_format(bp_tree, hf_bootp_file, NullTVB,
 662                                                    offset + 108, 128,
 663                                                    &pd[offset+108],
 664                                                    "Boot file name not given");
 665                 }
 666
 667                 if (pntohl(&pd[offset+236]) == 0x63825363) {
 668                         proto_tree_add_ipv4_format(bp_tree, hf_bootp_cookie, NullTVB,
 669                                                    offset + 236, 4,
 670                                                    pd[offset+236],
 671                                                    "Magic cookie: (OK)");
 672                 }
 673                 else {
 674                         memcpy(&ip_addr, &pd[offset + 236], sizeof(ip_addr));
 675                         proto_tree_add_ipv4(bp_tree, hf_bootp_cookie, NullTVB,
 676                                             offset + 236, 4, ip_addr);
 677                 }
 678
 679                 voff = offset+240;
 680                 eoff = pi.captured_len;
 681
 682                 while (voff < eoff) {
 683                         voff += bootp_option(pd, bp_tree, voff, eoff);
 684                 }
 685                 if (is_dhcp != NULL ) {
 686                         if (check_col(fd, COL_PROTOCOL))
 687                                 col_add_str(fd, COL_PROTOCOL, "DHCP");
 688                         if (check_col(fd, COL_INFO))
 689                                 col_add_fstr(fd, COL_INFO, "DHCP %-8s - Trans. ID 0x%x", is_dhcp, pntohl(&pd[offset+4]) );
 690                         proto_tree_add_boolean_hidden(bp_tree, hf_bootp_dhcp, NullTVB, 0, 0, 1);
 691                         }
 692         }
 693 }
 694
 695 void
 696 proto_register_bootp(void)
 697 {
 698   static hf_register_info hf[] = {
 699     { &hf_bootp_dhcp,
 700       { "Frame is DHCP",                "bootp.dhcp",    FT_BOOLEAN,  BASE_NONE, NULL, 0x0,
 701         "" }},
 702
 703     { &hf_bootp_type,
 704       { "Message type",                 "bootp.type",    FT_UINT8,  BASE_NONE, NULL, 0x0,
 705         "" }},
 706
 707     { &hf_bootp_hw_type,
 708       { "Hardware type",                "bootp.hw.type", FT_UINT8,  BASE_HEX, NULL, 0x0,
 709         "" }},
 710
 711     { &hf_bootp_hw_len,
 712       { "Hardware address length",      "bootp.hw.len",  FT_UINT8,  BASE_DEC, NULL, 0x0,
 713         "" }},
 714
 715     { &hf_bootp_hops,
 716       { "Hops",                         "bootp.hops",    FT_UINT8,  BASE_DEC, NULL, 0x0,
 717         "" }},
 718
 719     { &hf_bootp_id,
 720       { "Transaction ID",               "bootp.id",      FT_UINT32, BASE_HEX, NULL, 0x0,
 721         "" }},
 722
 723     { &hf_bootp_secs,
 724       { "Seconds elapsed",              "bootp.secs",    FT_UINT16, BASE_DEC, NULL, 0x0,
 725         "" }},
 726
 727     { &hf_bootp_flag,
 728       { "Broadcast flag",               "bootp.flag",    FT_UINT16, BASE_HEX, NULL, 0x0,
 729         "" }},
 730
 731     { &hf_bootp_ip_client,
 732       { "Client IP address",            "bootp.ip.client",FT_IPv4,  BASE_NONE, NULL, 0x0,
 733         "" }},
 734
 735     { &hf_bootp_ip_your,
 736       { "Your (client) IP address",     "bootp.ip.your",  FT_IPv4,  BASE_NONE, NULL, 0x0,
 737         "" }},
 738
 739     { &hf_bootp_ip_server,
 740       { "Next server IP address",       "bootp.ip.server",FT_IPv4,  BASE_NONE, NULL, 0x0,
 741         "" }},
 742
 743     { &hf_bootp_ip_relay,
 744       { "Relay agent IP address",       "bootp.ip.relay", FT_IPv4,  BASE_NONE, NULL, 0x0,
 745         "" }},
 746
 747     { &hf_bootp_hw_addr,
 748       { "Client hardware address",      "bootp.hw.addr", FT_BYTES,  BASE_NONE, NULL, 0x0,
 749         "" }},
 750
 751     { &hf_bootp_server,
 752       { "Server host name",             "bootp.server",  FT_STRING, BASE_NONE, NULL, 0x0,
 753         "" }},
 754
 755     { &hf_bootp_file,
 756       { "Boot file name",               "bootp.file",    FT_STRING, BASE_NONE, NULL, 0x0,
 757         "" }},
 758
 759     { &hf_bootp_cookie,
 760       { "Magic cookie",                 "bootp.cookie",  FT_IPv4,   BASE_NONE, NULL, 0x0,
 761         "" }},
 762   };
 763   static gint *ett[] = {
 764     &ett_bootp,
 765     &ett_bootp_option,
 766   };
 767
 768   proto_bootp = proto_register_protocol("Bootstrap Protocol", "bootp");
 769   proto_register_field_array(proto_bootp, hf, array_length(hf));
 770   proto_register_subtree_array(ett, array_length(ett));
 771 }
 772
 773 void
 774 proto_reg_handoff_bootp(void)
 775 {
 776   dissector_add("udp.port", UDP_PORT_BOOTPS, dissect_bootp);
 777 }