epan/dissectors/packet-ftp.c

   1 /* packet-ftp.c
   2  * Routines for ftp packet dissection
   3  * Copyright 1999, Richard Sharpe <rsharpe@ns.aus.com>
   4  * Copyright 2001, Juan Toledo <toledo@users.sourceforge.net> (Passive FTP)
   5  *
   6  * $Id$
   7  *
   8  * Wireshark - Network traffic analyzer
   9  * By Gerald Combs <gerald@wireshark.org>
  10  * Copyright 1998 Gerald Combs
  11  *
  12  * Copied from packet-pop.c
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version 2
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  27  */
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <ctype.h>
  36
  37 #include <string.h>
  38 #include <glib.h>
  39 #include <epan/packet.h>
  40 #include <epan/strutil.h>
  41 #include <epan/conversation.h>
  42 #include <epan/emem.h>
  43
  44 static int proto_ftp = -1;
  45 static int proto_ftp_data = -1;
  46 static int hf_ftp_response = -1;
  47 static int hf_ftp_request = -1;
  48 static int hf_ftp_request_command = -1;
  49 static int hf_ftp_request_arg = -1;
  50 static int hf_ftp_response_code = -1;
  51 static int hf_ftp_response_arg = -1;
  52 static int hf_ftp_pasv_ip = -1 ;
  53 static int hf_ftp_pasv_port = -1;
  54 static int hf_ftp_pasv_nat = -1;
  55 static int hf_ftp_active_ip = -1;
  56 static int hf_ftp_active_port = -1;
  57 static int hf_ftp_active_nat = -1;
  58
  59 static gint ett_ftp = -1;
  60 static gint ett_ftp_reqresp = -1;
  61 static gint ett_ftp_data = -1;
  62
  63 static dissector_handle_t ftpdata_handle;
  64
  65 #define TCP_PORT_FTPDATA                20
  66 #define TCP_PORT_FTP                    21
  67
  68 static const value_string response_table[] = {
  69         { 110, "Restart marker reply" },
  70         { 120, "Service ready in nnn minutes" },
  71         { 125, "Data connection already open; transfer starting" },
  72         { 150, "File status okay; about to open data connection" },
  73         { 200, "Command okay" },
  74         { 202, "Command not implemented, superfluous at this site" },
  75         { 211, "System status, or system help reply" },
  76         { 212, "Directory status" },
  77         { 213, "File status" },
  78         { 214, "Help message" },
  79         { 215, "NAME system type" },
  80         { 220, "Service ready for new user" },
  81         { 221, "Service closing control connection" },
  82         { 225, "Data connection open; no transfer in progress" },
  83         { 226, "Closing data connection" },
  84         { 227, "Entering Passive Mode" },
  85         { 229, "Entering Extended Passive Mode" },
  86         { 230, "User logged in, proceed" },
  87         { 232, "User logged in, authorized by security data exchange" },
  88         { 234, "Security data exchange complete" },
  89         { 235, "Security data exchange completed successfully" },
  90         { 250, "Requested file action okay, completed" },
  91         { 257, "PATHNAME created" },
  92         { 331, "User name okay, need password" },
  93         { 332, "Need account for login" },
  94         { 334, "Requested security mechanism is ok" },
  95         { 335, "Security data is acceptable, more is required" },
  96         { 336, "Username okay, need password. Challenge is ..." },
  97         { 350, "Requested file action pending further information" },
  98         { 421, "Service not available, closing control connection" },
  99         { 425, "Can't open data connection" },
 100         { 426, "Connection closed; transfer aborted" },
 101         { 431, "Need some unavailable resource to process security" },
 102         { 450, "Requested file action not taken" },
 103         { 451, "Requested action aborted: local error in processing" },
 104         { 452, "Requested action not taken. Insufficient storage space in system" },
 105         { 500, "Syntax error, command unrecognized" },
 106         { 501, "Syntax error in parameters or arguments" },
 107         { 502, "Command not implemented" },
 108         { 503, "Bad sequence of commands" },
 109         { 504, "Command not implemented for that parameter" },
 110         { 530, "Not logged in" },
 111         { 532, "Need account for storing files" },
 112         { 533, "Command protection level denied for policy reasons" },
 113         { 534, "Request denied for policy reasons" },
 114         { 535, "Failed security check (hash, sequence, etc)" },
 115         { 536, "Requested PROT level not supported by mechanism" },
 116         { 537, "Command protection level not supported by security mechanism" },
 117         { 550, "Requested action not taken: File unavailable" },
 118         { 551, "Requested action aborted: page type unknown" },
 119         { 552, "Requested file action aborted: Exceeded storage allocation" },
 120         { 553, "Requested action not taken: File name not allowed" },
 121         { 631, "Integrity protected reply" },
 122         { 632, "Confidentiality and integrity protected reply" },
 123         { 633, "Confidentiality protected reply" },
 124         { 0,   NULL }
 125 };
 126
 127 /*
 128  * Parse the address and port information in a PORT command or in the
 129  * response to a PASV command.  Return TRUE if we found an address and
 130  * port, and supply the address and port; return FALSE if we didn't find
 131  * them.
 132  *
 133  * We ignore the IP address in the reply, and use the address from which
 134  * the request came.
 135  *
 136  * XXX - are there cases where they differ?  What if the FTP server is
 137  * behind a NAT box, so that the address it puts into the reply isn't
 138  * the address at which you should contact it?  Do all NAT boxes detect
 139  * FTP PASV replies and rewrite the address?  (I suspect not.)
 140  *
 141  * RFC 959 doesn't say much about the syntax of the 227 reply.
 142  *
 143  * A proposal from Dan Bernstein at
 144  *
 145  *      http://cr.yp.to/ftp/retr.html
 146  *
 147  * "recommend[s] that clients use the following strategy to parse the
 148  * response line: look for the first digit after the initial space; look
 149  * for the fourth comma after that digit; read two (possibly negative)
 150  * integers, separated by a comma; the TCP port number is p1*256+p2, where
 151  * p1 is the first integer modulo 256 and p2 is the second integer modulo
 152  * 256."
 153  *
 154  * wget 1.5.3 looks for a digit, although it doesn't handle negative
 155  * integers.
 156  *
 157  * The FTP code in the source of the cURL library, at
 158  *
 159  *      http://curl.haxx.se/lxr/source/lib/ftp.c
 160  *
 161  * says that cURL "now scans for a sequence of six comma-separated numbers
 162  * and will take them as IP+port indicators"; it loops, doing "sscanf"s
 163  * looking for six numbers separated by commas, stepping the start pointer
 164  * in the scanf one character at a time - i.e., it tries rather exhaustively.
 165  *
 166  * An optimization would be to scan for a digit, and start there, and if
 167  * the scanf doesn't find six values, scan for the next digit and try
 168  * again; this will probably succeed on the first try.
 169  *
 170  * The cURL code also says that "found reply-strings include":
 171  *
 172  *      "227 Entering Passive Mode (127,0,0,1,4,51)"
 173  *      "227 Data transfer will passively listen to 127,0,0,1,4,51"
 174  *      "227 Entering passive mode. 127,0,0,1,4,51"
 175  *
 176  * so it appears that you can't assume there are parentheses around
 177  * the address and port number.
 178  */
 179 static gboolean
 180 parse_port_pasv(const guchar *line, int linelen, guint32 *ftp_ip,
 181     guint16 *ftp_port)
 182 {
 183         char *args;
 184         char *p;
 185         guchar c;
 186         int i;
 187         int ip_address[4], port[2];
 188         gboolean ret = FALSE;
 189
 190         /*
 191          * Copy the rest of the line into a null-terminated buffer.
 192          */
 193         args = ep_strndup(line, linelen);
 194         p = args;
 195
 196         for (;;) {
 197                 /*
 198                  * Look for a digit.
 199                  */
 200                 while ((c = *p) != '\0' && !isdigit(c))
 201                         p++;
 202
 203                 if (*p == '\0') {
 204                         /*
 205                          * We ran out of text without finding anything.
 206                          */
 207                         break;
 208                 }
 209
 210                 /*
 211                  * See if we have six numbers.
 212                  */
 213                 i = sscanf(p, "%d,%d,%d,%d,%d,%d",
 214                     &ip_address[0], &ip_address[1], &ip_address[2], &ip_address[3],
 215                     &port[0], &port[1]);
 216                 if (i == 6) {
 217                         /*
 218                          * We have a winner!
 219                          */
 220                         *ftp_port = ((port[0] & 0xFF)<<8) | (port[1] & 0xFF);
 221                         *ftp_ip = g_htonl((ip_address[0] << 24) | (ip_address[1] <<16) | (ip_address[2] <<8) | ip_address[3]);
 222                         ret = TRUE;
 223                         break;
 224                 }
 225
 226                 /*
 227                  * Well, that didn't work.  Skip the first number we found,
 228                  * and keep trying.
 229                  */
 230                 while ((c = *p) != '\0' && isdigit(c))
 231                         p++;
 232         }
 233
 234         return ret;
 235 }
 236
 237
 238 static gboolean
 239 parse_extended_pasv_response(const guchar *line, int linelen, guint16 *ftp_port)
 240 {
 241         int n;
 242         char *args;
 243         char *p;
 244         guchar c;
 245         gboolean ret = FALSE;
 246         gboolean delimiters_seen = FALSE;
 247
 248         /*
 249          * Copy the rest of the line into a null-terminated buffer.
 250          */
 251         args = ep_strndup(line, linelen);
 252         p = args;
 253
 254         /*
 255          * Look for ( <d> <d> <d>
 256            (Try to cope with '(' in description)
 257          */
 258         for (; !delimiters_seen;) {
 259                 guchar delimiter = '\0';
 260                 while ((c = *p) != '\0' && (c != '('))
 261                         p++;
 262
 263                 if (*p == '\0') {
 264                         return FALSE;
 265                 }
 266
 267                 /* Skip '(' */
 268                 p++;
 269
 270                 /* Make sure same delimiter is used 3 times */
 271                 for (n=0; n<3; n++) {
 272                         if ((c = *p) != '\0') {
 273                                 if (delimiter == '\0') {
 274                                         delimiter = c;
 275                                 }
 276                                 if (c != delimiter) {
 277                                         break;
 278                                 }
 279                         p++;
 280                         }
 281                         else {
 282                                 break;
 283                         }
 284                 }
 285                 delimiters_seen = TRUE;
 286         }
 287
 288         /*
 289          * Should now be at digits.
 290          */
 291         if (*p != '\0') {
 292                 /*
 293                  * We didn't run out of text without finding anything.
 294                  */
 295                 *ftp_port = atoi(p);
 296                 ret = TRUE;
 297         }
 298
 299         return ret;
 300 }
 301
 302
 303 static void
 304 dissect_ftp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 305 {
 306         gboolean        is_request;
 307         proto_tree      *ftp_tree = NULL;
 308         proto_tree      *reqresp_tree = NULL;
 309         proto_item      *ti, *hidden_item;
 310         gint            offset = 0;
 311         const guchar    *line;
 312         guint32         code;
 313         gchar           code_str[4];
 314         gboolean        is_port_request = FALSE;
 315         gboolean        is_pasv_response = FALSE;
 316         gboolean        is_epasv_response = FALSE;
 317         gint            next_offset;
 318         int             linelen;
 319         int             tokenlen;
 320         const guchar    *next_token;
 321         guint32         pasv_ip;
 322         guint32         ftp_ip;
 323         guint16         ftp_port;
 324         address         ftp_ip_address;
 325         gboolean        ftp_nat;
 326         conversation_t  *conversation;
 327
 328         ftp_ip_address = pinfo->src;
 329
 330         if (pinfo->match_uint == pinfo->destport)
 331                 is_request = TRUE;
 332         else
 333                 is_request = FALSE;
 334
 335         col_set_str(pinfo->cinfo, COL_PROTOCOL, "FTP");
 336
 337         /*
 338          * Find the end of the first line.
 339          *
 340          * Note that "tvb_find_line_end()" will return a value that is
 341          * not longer than what's in the buffer, so the "tvb_get_ptr()"
 342          * call won't throw an exception.
 343          */
 344         linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
 345         line = tvb_get_ptr(tvb, offset, linelen);
 346
 347         /*
 348          * Put the first line from the buffer into the summary
 349          * (but leave out the line terminator).
 350          */
 351         col_add_fstr(pinfo->cinfo, COL_INFO, "%s: %s",
 352                 is_request ? "Request" : "Response",
 353                 format_text(line, linelen));
 354
 355         if (tree) {
 356                 ti = proto_tree_add_item(tree, proto_ftp, tvb, offset, -1,
 357                     ENC_NA);
 358                 ftp_tree = proto_item_add_subtree(ti, ett_ftp);
 359
 360                 if (is_request) {
 361                         hidden_item = proto_tree_add_boolean(ftp_tree,
 362                             hf_ftp_request, tvb, 0, 0, TRUE);
 363                         PROTO_ITEM_SET_HIDDEN(hidden_item);
 364                         hidden_item = proto_tree_add_boolean(ftp_tree,
 365                             hf_ftp_response, tvb, 0, 0, FALSE);
 366                         PROTO_ITEM_SET_HIDDEN(hidden_item);
 367                 } else {
 368                         hidden_item = proto_tree_add_boolean(ftp_tree,
 369                             hf_ftp_request, tvb, 0, 0, FALSE);
 370                         PROTO_ITEM_SET_HIDDEN(hidden_item);
 371                         hidden_item = proto_tree_add_boolean(ftp_tree,
 372                             hf_ftp_response, tvb, 0, 0, TRUE);
 373                         PROTO_ITEM_SET_HIDDEN(hidden_item);
 374                 }
 375
 376                 /*
 377                  * Put the line into the protocol tree.
 378                  */
 379                 ti = proto_tree_add_text(ftp_tree, tvb, offset,
 380                     next_offset - offset, "%s",
 381                     tvb_format_text(tvb, offset, next_offset - offset));
 382                 reqresp_tree = proto_item_add_subtree(ti, ett_ftp_reqresp);
 383         }
 384
 385         if (is_request) {
 386                 /*
 387                  * Extract the first token, and, if there is a first
 388                  * token, add it as the request.
 389                  */
 390                 tokenlen = get_token_len(line, line + linelen, &next_token);
 391                 if (tokenlen != 0) {
 392                         if (tree) {
 393                                 proto_tree_add_item(reqresp_tree,
 394                                     hf_ftp_request_command, tvb, offset,
 395                                     tokenlen, ENC_ASCII|ENC_NA);
 396                         }
 397                         if (strncmp(line, "PORT", tokenlen) == 0)
 398                                 is_port_request = TRUE;
 399                 }
 400         } else {
 401                 /*
 402                  * This is a response; the response code is 3 digits,
 403                  * followed by a space or hyphen, possibly followed by
 404                  * text.
 405                  *
 406                  * If the line doesn't start with 3 digits, it's part of
 407                  * a continuation.
 408                  *
 409                  * XXX - keep track of state in the first pass, and
 410                  * treat non-continuation lines not beginning with digits
 411                  * as errors?
 412                  */
 413                 if (linelen >= 3 && isdigit(line[0]) && isdigit(line[1])
 414                     && isdigit(line[2])) {
 415                         /*
 416                          * One-line reply, or first or last line
 417                          * of a multi-line reply.
 418                          */
 419                         tvb_get_nstringz0(tvb, offset, sizeof(code_str), code_str);
 420                         code = strtoul(code_str, NULL, 10);
 421
 422                         if (tree) {
 423                                 proto_tree_add_uint(reqresp_tree,
 424                                     hf_ftp_response_code, tvb, offset, 3, code);
 425                         }
 426
 427                         /*
 428                          * See if it's a passive-mode response.
 429                          *
 430                          * XXX - does anybody do FOOBAR, as per RFC
 431                          * 1639, or has that been supplanted by RFC 2428?
 432                          */
 433                         if (code == 227)
 434                                 is_pasv_response = TRUE;
 435
 436                         /*
 437                          * Responses to EPSV command, as per RFC 2428
 438                          * XXX - handle IPv6?
 439                          */
 440                         if (code == 229)
 441                                 is_epasv_response = TRUE;
 442
 443                         /*
 444                          * Skip the 3 digits and, if present, the
 445                          * space or hyphen.
 446                          */
 447                         if (linelen >= 4)
 448                                 next_token = line + 4;
 449                         else
 450                                 next_token = line + linelen;
 451                 } else {
 452                         /*
 453                          * Line doesn't start with 3 digits; assume it's
 454                          * a line in the middle of a multi-line reply.
 455                          */
 456                         next_token = line;
 457                 }
 458         }
 459         offset += (gint) (next_token - line);
 460         linelen -= (int) (next_token - line);
 461         line = next_token;
 462
 463         if (tree) {
 464                 /*
 465                  * Add the rest of the first line as request or
 466                  * reply data.
 467                  */
 468                 if (linelen != 0) {
 469                         if (is_request) {
 470                                 proto_tree_add_item(reqresp_tree,
 471                                     hf_ftp_request_arg, tvb, offset,
 472                                     linelen, ENC_ASCII|ENC_NA);
 473                         } else {
 474                                 proto_tree_add_item(reqresp_tree,
 475                                     hf_ftp_response_arg, tvb, offset,
 476                                     linelen, ENC_ASCII|ENC_NA);
 477                         }
 478                 }
 479                 offset = next_offset;
 480         }
 481
 482         /*
 483          * If this is a PORT request or a PASV response, handle it.
 484          */
 485         if (is_port_request) {
 486                 if (parse_port_pasv(line, linelen, &ftp_ip, &ftp_port)) {
 487                         if (tree) {
 488                                 proto_tree_add_ipv4(reqresp_tree,
 489                                     hf_ftp_active_ip, tvb, 0, 0,
 490                                     ftp_ip);
 491                                 proto_tree_add_uint(reqresp_tree,
 492                                     hf_ftp_active_port, tvb, 0, 0,
 493                                     ftp_port);
 494                         }
 495                         SET_ADDRESS(&ftp_ip_address, AT_IPv4, 4, (const guint8 *)&ftp_ip);
 496                         ftp_nat = !ADDRESSES_EQUAL(&pinfo->src, &ftp_ip_address);
 497                         if (ftp_nat) {
 498                                 if (tree) {
 499                                         proto_tree_add_boolean(
 500                                             reqresp_tree,
 501                                             hf_ftp_active_nat, tvb,
 502                                             0, 0, ftp_nat);
 503                                 }
 504                         }
 505                 }
 506         }
 507
 508         if (is_pasv_response) {
 509                 if (linelen != 0) {
 510                         /*
 511                          * This frame contains a PASV response; set up a
 512                          * conversation for the data.
 513                          */
 514                         if (parse_port_pasv(line, linelen, &pasv_ip,
 515                             &ftp_port)) {
 516                                 if (tree) {
 517                                         proto_tree_add_ipv4(reqresp_tree,
 518                                             hf_ftp_pasv_ip, tvb, 0, 0, pasv_ip);
 519                                         proto_tree_add_uint(reqresp_tree,
 520                                             hf_ftp_pasv_port, tvb, 0, 0,
 521                                             ftp_port);
 522                                 }
 523                                 SET_ADDRESS(&ftp_ip_address, AT_IPv4, 4,
 524                                     (const guint8 *)&pasv_ip);
 525                                 ftp_nat = !ADDRESSES_EQUAL(&pinfo->src,
 526                                     &ftp_ip_address);
 527                                 if (ftp_nat) {
 528                                         if (tree) {
 529                                                 proto_tree_add_boolean(reqresp_tree,
 530                                                     hf_ftp_pasv_nat, tvb, 0, 0,
 531                                                     ftp_nat);
 532                                         }
 533                                 }
 534
 535                                 /*
 536                                  * We use "ftp_ip_address", so that if
 537                                  * we're NAT'd we look for the un-NAT'd
 538                                  * connection.
 539                                  *
 540                                  * XXX - should this call to
 541                                  * "find_conversation()" just use
 542                                  * "ftp_ip_address" and "server_port", and
 543                                  * wildcard everything else?
 544                                  */
 545                                 conversation = find_conversation(pinfo->fd->num, &ftp_ip_address,
 546                                     &pinfo->dst, PT_TCP, ftp_port, 0,
 547                                     NO_PORT_B);
 548                                 if (conversation == NULL) {
 549                                         /*
 550                                          * XXX - should this call to
 551                                          * "conversation_new()" just use
 552                                          * "ftp_ip_address" and "server_port",
 553                                          * and wildcard everything else?
 554                                          *
 555                                          * XXX - what if we did find a
 556                                          * conversation?  As we create it
 557                                          * only on the first pass through
 558                                          * the packets, if we find one, it's
 559                                          * presumably an unrelated conversation.
 560                                          * Should we remove the old one from
 561                                          * the hash table and put this one in
 562                                          * its place?  Can the conversation
 563                                          * code handle conversations not in
 564                                          * the hash table?  Or should we
 565                                          * make conversations support
 566                                          * start and end frames, as circuits
 567                                          * do, and treat this as an indication
 568                                          * that one conversation was closed
 569                                          * and a new one was opened?
 570                                          */
 571                                         conversation = conversation_new(
 572                                             pinfo->fd->num, &ftp_ip_address, &pinfo->dst,
 573                                             PT_TCP, ftp_port, 0, NO_PORT2);
 574                                         conversation_set_dissector(conversation,
 575                                             ftpdata_handle);
 576                                 }
 577                         }
 578                 }
 579         }
 580
 581
 582         if (is_epasv_response) {
 583                 if (linelen != 0) {
 584                         /*
 585                          * This frame contains an  EPSV response; set up a
 586                          * conversation for the data.
 587                          */
 588                         if (parse_extended_pasv_response(line, linelen, &ftp_port)) {
 589                                 /* Add port number to tree */
 590                                 if (tree) {
 591                                         proto_tree_add_uint(reqresp_tree,
 592                                                             hf_ftp_pasv_port, tvb, 0, 0,
 593                                                             ftp_port);
 594                                 }
 595
 596                                 /* Find/create conversation for data */
 597                                 conversation = find_conversation(pinfo->fd->num, &pinfo->src,
 598                                                                  &pinfo->dst, PT_TCP, ftp_port, 0,
 599                                                                  NO_PORT_B);
 600                                 if (conversation == NULL) {
 601                                         conversation = conversation_new(
 602                                             pinfo->fd->num, &pinfo->src, &pinfo->dst,
 603                                             PT_TCP, ftp_port, 0, NO_PORT2);
 604                                         conversation_set_dissector(conversation,
 605                                             ftpdata_handle);
 606                                 }
 607                         }
 608                 }
 609         }
 610
 611         if (tree) {
 612                 /*
 613                  * Show the rest of the request or response as text,
 614                  * a line at a time.
 615                  * XXX - only if there's a continuation indicator?
 616                  */
 617                 while (tvb_offset_exists(tvb, offset)) {
 618                         /*
 619                          * Find the end of the line.
 620                          */
 621                         linelen = tvb_find_line_end(tvb, offset, -1,
 622                             &next_offset, FALSE);
 623
 624                         /*
 625                          * Put this line.
 626                          */
 627                         proto_tree_add_text(ftp_tree, tvb, offset,
 628                             next_offset - offset, "%s",
 629                             tvb_format_text(tvb, offset, next_offset - offset));
 630                         offset = next_offset;
 631                 }
 632         }
 633 }
 634
 635 static void
 636 dissect_ftpdata(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 637 {
 638         proto_tree      *ti, *ftp_data_tree;
 639         int             data_length;
 640
 641         col_set_str(pinfo->cinfo, COL_PROTOCOL, "FTP-DATA");
 642
 643         col_add_fstr(pinfo->cinfo, COL_INFO, "FTP Data: %u bytes",
 644                 tvb_reported_length(tvb));
 645
 646         if (tree) {
 647                 data_length = tvb_length(tvb);
 648
 649                 ti = proto_tree_add_item(tree, proto_ftp_data, tvb, 0, -1,
 650                     ENC_NA);
 651                 ftp_data_tree = proto_item_add_subtree(ti, ett_ftp_data);
 652
 653                 /*
 654                  * XXX - if this is binary data, it'll produce
 655                  * a *really* long line.
 656                  */
 657                 proto_tree_add_text(ftp_data_tree, tvb, 0, data_length,
 658                     "FTP Data: %s", tvb_format_text(tvb, 0, data_length));
 659         }
 660 }
 661
 662 void
 663 proto_register_ftp(void)
 664 {
 665     static hf_register_info hf[] = {
 666     { &hf_ftp_response,
 667       { "Response",           "ftp.response",
 668         FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 669         "TRUE if FTP response", HFILL }},
 670
 671     { &hf_ftp_request,
 672       { "Request",            "ftp.request",
 673         FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 674         "TRUE if FTP request", HFILL }},
 675
 676     { &hf_ftp_request_command,
 677       { "Request command",    "ftp.request.command",
 678         FT_STRING,  BASE_NONE, NULL, 0x0,
 679         NULL, HFILL }},
 680
 681     { &hf_ftp_request_arg,
 682       { "Request arg",        "ftp.request.arg",
 683         FT_STRING,  BASE_NONE, NULL, 0x0,
 684         NULL, HFILL }},
 685
 686     { &hf_ftp_response_code,
 687       { "Response code",      "ftp.response.code",
 688         FT_UINT32,   BASE_DEC, VALS(response_table), 0x0,
 689         NULL, HFILL }},
 690
 691     { &hf_ftp_response_arg,
 692       { "Response arg",      "ftp.response.arg",
 693         FT_STRING,  BASE_NONE, NULL, 0x0,
 694         NULL, HFILL }},
 695
 696     { &hf_ftp_pasv_ip,
 697       { "Passive IP address", "ftp.passive.ip",
 698         FT_IPv4, BASE_NONE, NULL,0x0,
 699         "Passive IP address (check NAT)", HFILL}},
 700
 701     { &hf_ftp_pasv_port,
 702       { "Passive port", "ftp.passive.port",
 703        FT_UINT16, BASE_DEC, NULL,0x0,
 704         "Passive FTP server port", HFILL }},
 705
 706     { &hf_ftp_pasv_nat,
 707       {"Passive IP NAT", "ftp.passive.nat",
 708         FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 709         "NAT is active SIP and passive IP different", HFILL }},
 710
 711     { &hf_ftp_active_ip,
 712       { "Active IP address", "ftp.active.cip",
 713         FT_IPv4, BASE_NONE, NULL, 0x0,
 714         "Active FTP client IP address", HFILL }},
 715
 716     { &hf_ftp_active_port,
 717       {"Active port", "ftp.active.port",
 718         FT_UINT16, BASE_DEC, NULL, 0x0,
 719         "Active FTP client port", HFILL }},
 720
 721     { &hf_ftp_active_nat,
 722       { "Active IP NAT", "ftp.active.nat",
 723         FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 724         "NAT is active", HFILL}}
 725
 726   };
 727   static gint *ett[] = {
 728     &ett_ftp,
 729     &ett_ftp_reqresp,
 730     &ett_ftp_data,
 731   };
 732
 733   proto_ftp = proto_register_protocol("File Transfer Protocol (FTP)", "FTP",
 734                                       "ftp");
 735   register_dissector("ftp", dissect_ftp, proto_ftp);
 736   proto_ftp_data = proto_register_protocol("FTP Data", "FTP-DATA", "ftp-data");
 737   register_dissector("ftp-data", dissect_ftpdata, proto_ftp_data);
 738   proto_register_field_array(proto_ftp, hf, array_length(hf));
 739   proto_register_subtree_array(ett, array_length(ett));
 740 }
 741
 742 void
 743 proto_reg_handoff_ftp(void)
 744 {
 745   dissector_handle_t ftp_handle;
 746
 747   ftpdata_handle = find_dissector("ftp-data");
 748   dissector_add_uint("tcp.port", TCP_PORT_FTPDATA, ftpdata_handle);
 749   ftp_handle = find_dissector("ftp");
 750   dissector_add_uint("tcp.port", TCP_PORT_FTP, ftp_handle);
 751 }