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