forked from osmocom/wireshark
8ed7a73e22
Cast away some implicit 64-bit-to-32-bit conversion errors due to use of sizeof. Cast away some implicit 64-bit-to-32-bit conversion errors due to use of strtol() and strtoul(). Change some data types to avoid those implicit conversion warnings. When assigning a constant to a float, make sure the constant isn't a double, by appending "f" to the constant. Constify a bunch of variables, parameters, and return values to eliminate warnings due to strings being given const qualifiers. Cast away those warnings in some cases where an API we don't control forces us to do so. Enable a bunch of additional warnings by default. Note why at least some of the other warnings aren't enabled. randpkt.c and text2pcap.c are used to build programs, so they don't need to be in EXTRA_DIST. If the user specifies --enable-warnings-as-errors, add -Werror *even if the user specified --enable-extra-gcc-flags; assume they know what they're doing and are willing to have the compile fail due to the extra GCC warnings being treated as errors. svn path=/trunk/; revision=46748
1080 lines
37 KiB
C
1080 lines
37 KiB
C
/* packet-ftp.c
|
|
* Routines for ftp packet dissection
|
|
* Copyright 1999, Richard Sharpe <rsharpe@ns.aus.com>
|
|
* Copyright 2001, Juan Toledo <toledo@users.sourceforge.net> (Passive FTP)
|
|
*
|
|
* $Id$
|
|
*
|
|
* Wireshark - Network traffic analyzer
|
|
* By Gerald Combs <gerald@wireshark.org>
|
|
* Copyright 1998 Gerald Combs
|
|
*
|
|
* Copied from packet-pop.c
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <ctype.h>
|
|
|
|
#include <string.h>
|
|
#include <glib.h>
|
|
#include <epan/packet.h>
|
|
#include <epan/strutil.h>
|
|
#include <epan/conversation.h>
|
|
#include <epan/emem.h>
|
|
#include <epan/expert.h>
|
|
|
|
#ifdef HAVE_ARPA_INET_H
|
|
#include <arpa/inet.h>
|
|
#endif
|
|
#ifdef HAVE_SYS_SOCKET_H
|
|
#include <sys/socket.h> /* needed to define AF_ values on UNIX */
|
|
#endif
|
|
#ifdef HAVE_WINSOCK2_H
|
|
#include <winsock2.h> /* needed to define AF_ values on Windows */
|
|
#endif
|
|
#ifdef NEED_INET_V6DEFS_H
|
|
#include "wsutil/inet_v6defs.h" /* if not a *NIX system */
|
|
#endif
|
|
|
|
|
|
|
|
static int proto_ftp = -1;
|
|
static int proto_ftp_data = -1;
|
|
static int hf_ftp_response = -1;
|
|
static int hf_ftp_request = -1;
|
|
static int hf_ftp_request_command = -1;
|
|
static int hf_ftp_request_arg = -1;
|
|
static int hf_ftp_response_code = -1;
|
|
static int hf_ftp_response_arg = -1;
|
|
static int hf_ftp_pasv_ip = -1 ;
|
|
static int hf_ftp_pasv_port = -1;
|
|
static int hf_ftp_pasv_nat = -1;
|
|
static int hf_ftp_active_ip = -1;
|
|
static int hf_ftp_active_port = -1;
|
|
static int hf_ftp_active_nat = -1;
|
|
static int hf_ftp_eprt_af = -1;
|
|
static int hf_ftp_eprt_ip = -1;
|
|
static int hf_ftp_eprt_ipv6 = -1;
|
|
static int hf_ftp_eprt_port = -1;
|
|
static int hf_ftp_epsv_ip = -1;
|
|
static int hf_ftp_epsv_ipv6 = -1;
|
|
static int hf_ftp_epsv_port = -1;
|
|
|
|
static gint ett_ftp = -1;
|
|
static gint ett_ftp_reqresp = -1;
|
|
|
|
static dissector_handle_t ftpdata_handle;
|
|
|
|
#define TCP_PORT_FTPDATA 20
|
|
#define TCP_PORT_FTP 21
|
|
|
|
static const value_string response_table[] = {
|
|
{ 110, "Restart marker reply" },
|
|
{ 120, "Service ready in nnn minutes" },
|
|
{ 125, "Data connection already open; transfer starting" },
|
|
{ 150, "File status okay; about to open data connection" },
|
|
{ 200, "Command okay" },
|
|
{ 202, "Command not implemented, superfluous at this site" },
|
|
{ 211, "System status, or system help reply" },
|
|
{ 212, "Directory status" },
|
|
{ 213, "File status" },
|
|
{ 214, "Help message" },
|
|
{ 215, "NAME system type" },
|
|
{ 220, "Service ready for new user" },
|
|
{ 221, "Service closing control connection" },
|
|
{ 225, "Data connection open; no transfer in progress" },
|
|
{ 226, "Closing data connection" },
|
|
{ 227, "Entering Passive Mode" },
|
|
{ 229, "Entering Extended Passive Mode" },
|
|
{ 230, "User logged in, proceed" },
|
|
{ 232, "User logged in, authorized by security data exchange" },
|
|
{ 234, "Security data exchange complete" },
|
|
{ 235, "Security data exchange completed successfully" },
|
|
{ 250, "Requested file action okay, completed" },
|
|
{ 257, "PATHNAME created" },
|
|
{ 331, "User name okay, need password" },
|
|
{ 332, "Need account for login" },
|
|
{ 334, "Requested security mechanism is ok" },
|
|
{ 335, "Security data is acceptable, more is required" },
|
|
{ 336, "Username okay, need password. Challenge is ..." },
|
|
{ 350, "Requested file action pending further information" },
|
|
{ 421, "Service not available, closing control connection" },
|
|
{ 425, "Can't open data connection" },
|
|
{ 426, "Connection closed; transfer aborted" },
|
|
{ 431, "Need some unavailable resource to process security" },
|
|
{ 450, "Requested file action not taken" },
|
|
{ 451, "Requested action aborted: local error in processing" },
|
|
{ 452, "Requested action not taken. Insufficient storage space in system" },
|
|
{ 500, "Syntax error, command unrecognized" },
|
|
{ 501, "Syntax error in parameters or arguments" },
|
|
{ 502, "Command not implemented" },
|
|
{ 503, "Bad sequence of commands" },
|
|
{ 504, "Command not implemented for that parameter" },
|
|
{ 522, "Network protocol not supported" },
|
|
{ 530, "Not logged in" },
|
|
{ 532, "Need account for storing files" },
|
|
{ 533, "Command protection level denied for policy reasons" },
|
|
{ 534, "Request denied for policy reasons" },
|
|
{ 535, "Failed security check (hash, sequence, etc)" },
|
|
{ 536, "Requested PROT level not supported by mechanism" },
|
|
{ 537, "Command protection level not supported by security mechanism" },
|
|
{ 550, "Requested action not taken: File unavailable" },
|
|
{ 551, "Requested action aborted: page type unknown" },
|
|
{ 552, "Requested file action aborted: Exceeded storage allocation" },
|
|
{ 553, "Requested action not taken: File name not allowed" },
|
|
{ 631, "Integrity protected reply" },
|
|
{ 632, "Confidentiality and integrity protected reply" },
|
|
{ 633, "Confidentiality protected reply" },
|
|
{ 0, NULL }
|
|
};
|
|
static value_string_ext response_table_ext = VALUE_STRING_EXT_INIT(response_table);
|
|
|
|
#define EPRT_AF_IPv4 1
|
|
#define EPRT_AF_IPv6 2
|
|
static const value_string eprt_af_vals[] = {
|
|
{ EPRT_AF_IPv4, "IPv4" },
|
|
{ EPRT_AF_IPv6, "IPv6" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
|
|
/*
|
|
* Parse the address and port information in a PORT command or in the
|
|
* response to a PASV command. Return TRUE if we found an address and
|
|
* port, and supply the address and port; return FALSE if we didn't find
|
|
* them.
|
|
*
|
|
* We ignore the IP address in the reply, and use the address from which
|
|
* the request came.
|
|
*
|
|
* XXX - are there cases where they differ? What if the FTP server is
|
|
* behind a NAT box, so that the address it puts into the reply isn't
|
|
* the address at which you should contact it? Do all NAT boxes detect
|
|
* FTP PASV replies and rewrite the address? (I suspect not.)
|
|
*
|
|
* RFC 959 doesn't say much about the syntax of the 227 reply.
|
|
*
|
|
* A proposal from Dan Bernstein at
|
|
*
|
|
* http://cr.yp.to/ftp/retr.html
|
|
*
|
|
* "recommend[s] that clients use the following strategy to parse the
|
|
* response line: look for the first digit after the initial space; look
|
|
* for the fourth comma after that digit; read two (possibly negative)
|
|
* integers, separated by a comma; the TCP port number is p1*256+p2, where
|
|
* p1 is the first integer modulo 256 and p2 is the second integer modulo
|
|
* 256."
|
|
*
|
|
* wget 1.5.3 looks for a digit, although it doesn't handle negative
|
|
* integers.
|
|
*
|
|
* The FTP code in the source of the cURL library, at
|
|
*
|
|
* http://curl.haxx.se/lxr/source/lib/ftp.c
|
|
*
|
|
* says that cURL "now scans for a sequence of six comma-separated numbers
|
|
* and will take them as IP+port indicators"; it loops, doing "sscanf"s
|
|
* looking for six numbers separated by commas, stepping the start pointer
|
|
* in the scanf one character at a time - i.e., it tries rather exhaustively.
|
|
*
|
|
* An optimization would be to scan for a digit, and start there, and if
|
|
* the scanf doesn't find six values, scan for the next digit and try
|
|
* again; this will probably succeed on the first try.
|
|
*
|
|
* The cURL code also says that "found reply-strings include":
|
|
*
|
|
* "227 Entering Passive Mode (127,0,0,1,4,51)"
|
|
* "227 Data transfer will passively listen to 127,0,0,1,4,51"
|
|
* "227 Entering passive mode. 127,0,0,1,4,51"
|
|
*
|
|
* so it appears that you can't assume there are parentheses around
|
|
* the address and port number.
|
|
*/
|
|
static gboolean
|
|
parse_port_pasv(const guchar *line, int linelen, guint32 *ftp_ip, guint16 *ftp_port,
|
|
guint32 *pasv_offset, guint *ftp_ip_len, guint *ftp_port_len)
|
|
{
|
|
char *args;
|
|
char *p;
|
|
guchar c;
|
|
int i;
|
|
int ip_address[4], port[2];
|
|
gboolean ret = FALSE;
|
|
|
|
/*
|
|
* Copy the rest of the line into a null-terminated buffer.
|
|
*/
|
|
args = ep_strndup(line, linelen);
|
|
p = args;
|
|
|
|
for (;;) {
|
|
/*
|
|
* Look for a digit.
|
|
*/
|
|
while ((c = *p) != '\0' && !isdigit(c))
|
|
p++;
|
|
|
|
if (*p == '\0') {
|
|
/*
|
|
* We ran out of text without finding anything.
|
|
*/
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* See if we have six numbers.
|
|
*/
|
|
i = sscanf(p, "%d,%d,%d,%d,%d,%d",
|
|
&ip_address[0], &ip_address[1], &ip_address[2], &ip_address[3],
|
|
&port[0], &port[1]);
|
|
if (i == 6) {
|
|
/*
|
|
* We have a winner!
|
|
*/
|
|
*ftp_port = ((port[0] & 0xFF)<<8) | (port[1] & 0xFF);
|
|
*ftp_ip = g_htonl((ip_address[0] << 24) | (ip_address[1] <<16) | (ip_address[2] <<8) | ip_address[3]);
|
|
*pasv_offset = (guint32)(p - args);
|
|
*ftp_port_len = (port[0] < 10 ? 1 : (port[0] < 100 ? 2 : 3 )) + 1 +
|
|
(port[1] < 10 ? 1 : (port[1] < 100 ? 2 : 3 ));
|
|
*ftp_ip_len = (ip_address[0] < 10 ? 1 : (ip_address[0] < 100 ? 2 : 3)) + 1 +
|
|
(ip_address[1] < 10 ? 1 : (ip_address[1] < 100 ? 2 : 3)) + 1 +
|
|
(ip_address[2] < 10 ? 1 : (ip_address[2] < 100 ? 2 : 3)) + 1 +
|
|
(ip_address[3] < 10 ? 1 : (ip_address[3] < 100 ? 2 : 3));
|
|
ret = TRUE;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Well, that didn't work. Skip the first number we found,
|
|
* and keep trying.
|
|
*/
|
|
while ((c = *p) != '\0' && isdigit(c))
|
|
p++;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static gboolean
|
|
isvalid_rfc2428_delimiter(const guchar c)
|
|
{
|
|
/* RFC2428 sect. 2 states rules for a valid delimiter */
|
|
static const gchar forbidden[] = {"0123456789abcdef.:"};
|
|
if (c < 33 || c > 126)
|
|
return FALSE;
|
|
else if (strchr(forbidden, tolower(c)))
|
|
return FALSE;
|
|
else
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/*
|
|
* RFC2428 states...
|
|
*
|
|
* AF Number Protocol
|
|
* --------- --------
|
|
* 1 Internet Protocol, Version 4
|
|
* 2 Internet Protocol, Version 6
|
|
*
|
|
* AF Number Address Format Example
|
|
* --------- -------------- -------
|
|
* 1 dotted decimal 132.235.1.2
|
|
* 2 IPv6 string 1080::8:800:200C:417A
|
|
* representations
|
|
* defined in
|
|
*
|
|
* The following are sample EPRT commands:
|
|
* EPRT |1|132.235.1.2|6275|
|
|
* EPRT |2|1080::8:800:200C:417A|5282|
|
|
*
|
|
* The first command specifies that the server should use IPv4 to open a
|
|
* data connection to the host "132.235.1.2" on TCP port 6275. The
|
|
* second command specifies that the server should use the IPv6 network
|
|
* protocol and the network address "1080::8:800:200C:417A" to open a
|
|
* TCP data connection on port 5282.
|
|
*
|
|
* ... which means in fact that RFC2428 is capable to handle both,
|
|
* IPv4 and IPv6 so we have to care about the address family and properly
|
|
* act depending on it.
|
|
*
|
|
*/
|
|
static gboolean
|
|
parse_eprt_request(const guchar* line, gint linelen, guint32 *eprt_af,
|
|
guint32 *eprt_ip, guint16 *eprt_ipv6, guint16 *ftp_port,
|
|
guint32 *eprt_ip_len, guint32 *ftp_port_len)
|
|
{
|
|
gint delimiters_seen = 0;
|
|
gchar delimiter;
|
|
gint fieldlen;
|
|
gchar *field;
|
|
gint n;
|
|
gint lastn;
|
|
char *args, *p;
|
|
gboolean ret = TRUE;
|
|
|
|
|
|
/* line contains the EPRT parameters, we need at least the 4 delimiters */
|
|
if (!line || linelen<4)
|
|
return FALSE;
|
|
|
|
/* Copy the rest of the line into a null-terminated buffer. */
|
|
args = ep_strndup(line, linelen);
|
|
p = args;
|
|
|
|
/*
|
|
* RFC2428 sect. 2 states ...
|
|
*
|
|
* The EPRT command keyword MUST be followed by a single space (ASCII
|
|
* 32). Following the space, a delimiter character (<d>) MUST be
|
|
* specified.
|
|
*
|
|
* ... the preceding <space> is already stripped so we know that the first
|
|
* character must be the delimiter and has just to be checked to be valid.
|
|
*/
|
|
if (!isvalid_rfc2428_delimiter(*p))
|
|
return FALSE; /* EPRT command does not follow a vaild delimiter;
|
|
* malformed EPRT command - immediate escape */
|
|
|
|
delimiter = *p;
|
|
/* Validate that the delimiter occurs 4 times in the string */
|
|
for (n = 0; n < linelen; n++) {
|
|
if (*(p+n) == delimiter)
|
|
delimiters_seen++;
|
|
}
|
|
if (delimiters_seen != 4)
|
|
return FALSE; /* delimiter doesn't occur 4 times
|
|
* probably no EPRT request - immediate escape */
|
|
|
|
/* we know that the first character is a delimiter... */
|
|
delimiters_seen = 1;
|
|
lastn = 0;
|
|
/* ... so we can start searching from the 2nd onwards */
|
|
for (n=1; n < linelen; n++) {
|
|
|
|
if (*(p+n) != delimiter)
|
|
continue;
|
|
|
|
/* we found a delimiter */
|
|
delimiters_seen++;
|
|
|
|
fieldlen = n - lastn - 1;
|
|
if (fieldlen<=0)
|
|
return FALSE; /* all fields must have data in them */
|
|
field = p + lastn + 1;
|
|
|
|
if (delimiters_seen == 2) { /* end of address family field */
|
|
gchar *af_str;
|
|
af_str = ep_strndup(field, fieldlen);
|
|
*eprt_af = atoi(af_str);
|
|
}
|
|
else if (delimiters_seen == 3) {/* end of IP address field */
|
|
gchar *ip_str;
|
|
ip_str = ep_strndup(field, fieldlen);
|
|
|
|
if (*eprt_af == EPRT_AF_IPv4) {
|
|
if (inet_pton(AF_INET, ip_str, eprt_ip) == 1)
|
|
ret = TRUE;
|
|
else
|
|
ret = FALSE;
|
|
}
|
|
else if (*eprt_af == EPRT_AF_IPv6) {
|
|
if (inet_pton(AF_INET6, ip_str, eprt_ipv6) == 1)
|
|
ret = TRUE;
|
|
else
|
|
ret = FALSE;
|
|
}
|
|
else
|
|
return FALSE; /* invalid/unknown address family */
|
|
|
|
*eprt_ip_len = fieldlen;
|
|
}
|
|
else if (delimiters_seen == 4) {/* end of port field */
|
|
gchar *pt_str;
|
|
pt_str = ep_strndup(field, fieldlen);
|
|
|
|
*ftp_port = atoi(pt_str);
|
|
*ftp_port_len = fieldlen;
|
|
}
|
|
|
|
lastn = n;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* RFC2428 states ....
|
|
*
|
|
* The first two fields contained in the parenthesis MUST be blank. The
|
|
* third field MUST be the string representation of the TCP port number
|
|
* on which the server is listening for a data connection.
|
|
*
|
|
* The network protocol used by the data connection will be the same network
|
|
* protocol used by the control connection. In addition, the network
|
|
* address used to establish the data connection will be the same
|
|
* network address used for the control connection.
|
|
*
|
|
* An example response string follows:
|
|
*
|
|
* Entering Extended Passive Mode (|||6446|)
|
|
*
|
|
* ... which in fact means that again both address families IPv4 and IPv6
|
|
* are supported. But gladly it's not necessary to parse because it doesn't
|
|
* occur in EPSV responses. We can leverage ftp_ip_address which is
|
|
* protocol independent and already set.
|
|
*
|
|
*/
|
|
static gboolean
|
|
parse_extended_pasv_response(const guchar *line, gint linelen, guint16 *ftp_port,
|
|
guint *pasv_offset, guint *ftp_port_len)
|
|
{
|
|
gint n;
|
|
gchar *args;
|
|
gchar *p;
|
|
gchar *e;
|
|
guchar c;
|
|
gboolean ret = FALSE;
|
|
gboolean delimiters_seen = FALSE;
|
|
|
|
/*
|
|
* Copy the rest of the line into a null-terminated buffer.
|
|
*/
|
|
args = ep_strndup(line, linelen);
|
|
p = args;
|
|
|
|
/*
|
|
* Look for ( <d> <d> <d>
|
|
(Try to cope with '(' in description)
|
|
*/
|
|
for (; !delimiters_seen;) {
|
|
guchar delimiter = '\0';
|
|
while ((c = *p) != '\0' && (c != '('))
|
|
p++;
|
|
|
|
if (*p == '\0') {
|
|
return FALSE;
|
|
}
|
|
|
|
/* Skip '(' */
|
|
p++;
|
|
|
|
/* Make sure same delimiter is used 3 times */
|
|
for (n=0; n<3; n++) {
|
|
if ((c = *p) != '\0') {
|
|
if (delimiter == '\0' && isvalid_rfc2428_delimiter(c)) {
|
|
delimiter = c;
|
|
}
|
|
if (c != delimiter) {
|
|
break;
|
|
}
|
|
p++;
|
|
}
|
|
else {
|
|
break;
|
|
}
|
|
}
|
|
delimiters_seen = TRUE;
|
|
}
|
|
|
|
/*
|
|
* Should now be at digits.
|
|
*/
|
|
if (*p != '\0') {
|
|
/*
|
|
* We didn't run out of text without finding anything.
|
|
*/
|
|
*ftp_port = atoi(p);
|
|
*pasv_offset = (guint32)(p - args);
|
|
|
|
ret = TRUE;
|
|
|
|
/* get port string length */
|
|
if ((e=strchr(p,')')) == NULL) {
|
|
ret = FALSE;
|
|
}
|
|
else {
|
|
*ftp_port_len = (guint)(--e - p);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static void
|
|
dissect_ftp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
gboolean is_request;
|
|
proto_tree *ftp_tree = NULL;
|
|
proto_tree *reqresp_tree = NULL;
|
|
proto_item *ti, *hidden_item;
|
|
gint offset;
|
|
const guchar *line;
|
|
guint32 code;
|
|
gchar code_str[4];
|
|
gboolean is_port_request = FALSE;
|
|
gboolean is_eprt_request = FALSE;
|
|
gboolean is_pasv_response = FALSE;
|
|
gboolean is_epasv_response = FALSE;
|
|
gint next_offset;
|
|
int linelen;
|
|
int tokenlen = 0;
|
|
const guchar *next_token;
|
|
guint32 pasv_ip;
|
|
guint32 pasv_offset;
|
|
guint32 ftp_ip;
|
|
guint32 ftp_ip_len;
|
|
guint32 eprt_offset;
|
|
guint32 eprt_af = 0;
|
|
guint32 eprt_ip;
|
|
guint16 eprt_ipv6[8];
|
|
guint32 eprt_ip_len = 0;
|
|
guint16 ftp_port;
|
|
guint32 ftp_port_len;
|
|
address ftp_ip_address;
|
|
gboolean ftp_nat;
|
|
conversation_t *conversation;
|
|
|
|
ftp_ip_address = pinfo->src;
|
|
|
|
if (pinfo->match_uint == pinfo->destport)
|
|
is_request = TRUE;
|
|
else
|
|
is_request = FALSE;
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "FTP");
|
|
|
|
/*
|
|
* Find the end of the first line.
|
|
*
|
|
* Note that "tvb_find_line_end()" will return a value that is
|
|
* not longer than what's in the buffer, so the "tvb_get_ptr()"
|
|
* call won't throw an exception.
|
|
*/
|
|
linelen = tvb_find_line_end(tvb, 0, -1, &next_offset, FALSE);
|
|
line = tvb_get_ptr(tvb, 0, linelen);
|
|
|
|
/*
|
|
* Put the first line from the buffer into the summary
|
|
* (but leave out the line terminator).
|
|
*/
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "%s: %s",
|
|
is_request ? "Request" : "Response",
|
|
format_text(line, linelen));
|
|
|
|
ti = proto_tree_add_item(tree, proto_ftp, tvb, 0, -1, ENC_NA);
|
|
ftp_tree = proto_item_add_subtree(ti, ett_ftp);
|
|
|
|
if (is_request) {
|
|
hidden_item = proto_tree_add_boolean(ftp_tree,
|
|
hf_ftp_request, tvb, 0, 0, TRUE);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
hidden_item = proto_tree_add_boolean(ftp_tree,
|
|
hf_ftp_response, tvb, 0, 0, FALSE);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
} else {
|
|
hidden_item = proto_tree_add_boolean(ftp_tree,
|
|
hf_ftp_request, tvb, 0, 0, FALSE);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
hidden_item = proto_tree_add_boolean(ftp_tree,
|
|
hf_ftp_response, tvb, 0, 0, TRUE);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
}
|
|
|
|
/* Put the line into the protocol tree. */
|
|
ti = proto_tree_add_text(ftp_tree, tvb, 0, next_offset, "%s",
|
|
tvb_format_text(tvb, 0, next_offset));
|
|
reqresp_tree = proto_item_add_subtree(ti, ett_ftp_reqresp);
|
|
|
|
if (is_request) {
|
|
/*
|
|
* Extract the first token, and, if there is a first
|
|
* token, add it as the request.
|
|
*/
|
|
tokenlen = get_token_len(line, line + linelen, &next_token);
|
|
if (tokenlen != 0) {
|
|
proto_tree_add_item(reqresp_tree, hf_ftp_request_command,
|
|
tvb, 0, tokenlen, ENC_ASCII|ENC_NA);
|
|
if (strncmp(line, "PORT", tokenlen) == 0)
|
|
is_port_request = TRUE;
|
|
/*
|
|
* EPRT request command, as per RFC 2428
|
|
*/
|
|
else if (strncmp(line, "EPRT", tokenlen) == 0)
|
|
is_eprt_request = TRUE;
|
|
}
|
|
} else {
|
|
/*
|
|
* This is a response; the response code is 3 digits,
|
|
* followed by a space or hyphen, possibly followed by
|
|
* text.
|
|
*
|
|
* If the line doesn't start with 3 digits, it's part of
|
|
* a continuation.
|
|
*
|
|
* XXX - keep track of state in the first pass, and
|
|
* treat non-continuation lines not beginning with digits
|
|
* as errors?
|
|
*/
|
|
if (linelen >= 3 && isdigit(line[0]) && isdigit(line[1])
|
|
&& isdigit(line[2])) {
|
|
/*
|
|
* One-line reply, or first or last line
|
|
* of a multi-line reply.
|
|
*/
|
|
tvb_get_nstringz0(tvb, 0, sizeof(code_str), code_str);
|
|
code = (guint32)strtoul(code_str, NULL, 10);
|
|
|
|
proto_tree_add_uint(reqresp_tree,
|
|
hf_ftp_response_code, tvb, 0, 3, code);
|
|
|
|
/*
|
|
* See if it's a passive-mode response.
|
|
*
|
|
* XXX - does anybody do FOOBAR, as per RFC
|
|
* 1639, or has that been supplanted by RFC 2428?
|
|
*/
|
|
if (code == 227)
|
|
is_pasv_response = TRUE;
|
|
|
|
/*
|
|
* Responses to EPSV command, as per RFC 2428
|
|
*/
|
|
if (code == 229)
|
|
is_epasv_response = TRUE;
|
|
|
|
/*
|
|
* Skip the 3 digits and, if present, the
|
|
* space or hyphen.
|
|
*/
|
|
if (linelen >= 4)
|
|
next_token = line + 4;
|
|
else
|
|
next_token = line + linelen;
|
|
} else {
|
|
/*
|
|
* Line doesn't start with 3 digits; assume it's
|
|
* a line in the middle of a multi-line reply.
|
|
*/
|
|
next_token = line;
|
|
}
|
|
}
|
|
|
|
offset = (gint) (next_token - line);
|
|
linelen -= (int) (next_token - line);
|
|
line = next_token;
|
|
|
|
/*
|
|
* Add the rest of the first line as request or
|
|
* reply data.
|
|
*/
|
|
if (linelen != 0) {
|
|
if (is_request) {
|
|
proto_tree_add_item(reqresp_tree,
|
|
hf_ftp_request_arg, tvb, offset,
|
|
linelen, ENC_ASCII|ENC_NA);
|
|
} else {
|
|
proto_tree_add_item(reqresp_tree,
|
|
hf_ftp_response_arg, tvb, offset,
|
|
linelen, ENC_ASCII|ENC_NA);
|
|
}
|
|
}
|
|
offset = next_offset;
|
|
|
|
/*
|
|
* If this is a PORT request or a PASV response, handle it.
|
|
*/
|
|
if (is_port_request) {
|
|
if (parse_port_pasv(line, linelen, &ftp_ip, &ftp_port, &pasv_offset, &ftp_ip_len, &ftp_port_len)) {
|
|
proto_tree_add_ipv4(reqresp_tree, hf_ftp_active_ip,
|
|
tvb, pasv_offset + (tokenlen+1) , ftp_ip_len, ftp_ip);
|
|
proto_tree_add_uint(reqresp_tree, hf_ftp_active_port,
|
|
tvb, pasv_offset + 1 + (tokenlen+1) + ftp_ip_len, ftp_port_len, ftp_port);
|
|
SET_ADDRESS(&ftp_ip_address, AT_IPv4, 4, (const guint8 *)&ftp_ip);
|
|
ftp_nat = !ADDRESSES_EQUAL(&pinfo->src, &ftp_ip_address);
|
|
if (ftp_nat) {
|
|
proto_tree_add_boolean(reqresp_tree, hf_ftp_active_nat,
|
|
tvb, 0, 0, ftp_nat);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (is_pasv_response) {
|
|
if (linelen != 0) {
|
|
/*
|
|
* This frame contains a PASV response; set up a
|
|
* conversation for the data.
|
|
*/
|
|
if (parse_port_pasv(line, linelen, &pasv_ip, &ftp_port, &pasv_offset, &ftp_ip_len, &ftp_port_len)) {
|
|
proto_tree_add_ipv4(reqresp_tree, hf_ftp_pasv_ip,
|
|
tvb, pasv_offset + 4, ftp_ip_len, pasv_ip);
|
|
proto_tree_add_uint(reqresp_tree, hf_ftp_pasv_port,
|
|
tvb, pasv_offset + 4 + 1 + ftp_ip_len, ftp_port_len, ftp_port);
|
|
SET_ADDRESS(&ftp_ip_address, AT_IPv4, 4,
|
|
(const guint8 *)&pasv_ip);
|
|
ftp_nat = !ADDRESSES_EQUAL(&pinfo->src, &ftp_ip_address);
|
|
if (ftp_nat) {
|
|
proto_tree_add_boolean(reqresp_tree, hf_ftp_pasv_nat,
|
|
tvb, 0, 0, ftp_nat);
|
|
}
|
|
|
|
/*
|
|
* We use "ftp_ip_address", so that if
|
|
* we're NAT'd we look for the un-NAT'd
|
|
* connection.
|
|
*
|
|
* XXX - should this call to
|
|
* "find_conversation()" just use
|
|
* "ftp_ip_address" and "server_port", and
|
|
* wildcard everything else?
|
|
*/
|
|
conversation = find_conversation(pinfo->fd->num, &ftp_ip_address,
|
|
&pinfo->dst, PT_TCP, ftp_port, 0,
|
|
NO_PORT_B);
|
|
if (conversation == NULL) {
|
|
/*
|
|
* XXX - should this call to "conversation_new()"
|
|
* just use "ftp_ip_address" and "server_port",
|
|
* and wildcard everything else?
|
|
*
|
|
* XXX - what if we did find a conversation? As
|
|
* we create it only on the first pass through the
|
|
* packets, if we find one, it's presumably an
|
|
* unrelated conversation. Should we remove the
|
|
* old one from the hash table and put this one in
|
|
* its place? Can the conversation code handle
|
|
* conversations not in the hash table? Or should
|
|
* we make conversations support start and end
|
|
* frames, as circuits do, and treat this as an
|
|
* indication that one conversation was closed and
|
|
* a new one was opened?
|
|
*/
|
|
conversation = conversation_new(
|
|
pinfo->fd->num, &ftp_ip_address, &pinfo->dst,
|
|
PT_TCP, ftp_port, 0, NO_PORT2);
|
|
conversation_set_dissector(conversation, ftpdata_handle);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (is_eprt_request) {
|
|
/*
|
|
* RFC2428 - sect. 2
|
|
* This frame contains a EPRT request; let's dissect it and set up a
|
|
* conversation for the data connection.
|
|
*/
|
|
if (parse_eprt_request(line, linelen,
|
|
&eprt_af, &eprt_ip, eprt_ipv6, &ftp_port,
|
|
&eprt_ip_len, &ftp_port_len)) {
|
|
|
|
/* since parse_eprt_request() returned TRUE,
|
|
we know that we have a valid address family */
|
|
eprt_offset = tokenlen + 1 + 1; /* token, space, 1st delimiter */
|
|
proto_tree_add_uint(reqresp_tree, hf_ftp_eprt_af, tvb,
|
|
eprt_offset, 1, eprt_af);
|
|
eprt_offset += 1 + 1; /* addr family, 2nd delimiter */
|
|
|
|
if (eprt_af == EPRT_AF_IPv4) {
|
|
proto_tree_add_ipv4(reqresp_tree, hf_ftp_eprt_ip,
|
|
tvb, eprt_offset, eprt_ip_len, eprt_ip);
|
|
SET_ADDRESS(&ftp_ip_address, AT_IPv4, 4,
|
|
(const guint8 *)&eprt_ip);
|
|
}
|
|
else if (eprt_af == EPRT_AF_IPv6) {
|
|
proto_tree_add_ipv6(reqresp_tree, hf_ftp_eprt_ipv6,
|
|
tvb, eprt_offset, eprt_ip_len, (const guint8 *)eprt_ipv6);
|
|
SET_ADDRESS(&ftp_ip_address, AT_IPv6, 16,
|
|
(const guint8 *)&eprt_ipv6);
|
|
}
|
|
eprt_offset += eprt_ip_len + 1; /* addr, 3rd delimiter */
|
|
|
|
proto_tree_add_uint(reqresp_tree, hf_ftp_eprt_port,
|
|
tvb, eprt_offset, ftp_port_len, ftp_port);
|
|
|
|
/* Find/create conversation for data */
|
|
conversation = find_conversation(pinfo->fd->num,
|
|
&pinfo->src, &ftp_ip_address,
|
|
PT_TCP, ftp_port, 0, NO_PORT_B);
|
|
if (conversation == NULL) {
|
|
conversation = conversation_new(
|
|
pinfo->fd->num, &pinfo->src, &ftp_ip_address,
|
|
PT_TCP, ftp_port, 0, NO_PORT2);
|
|
conversation_set_dissector(conversation,
|
|
ftpdata_handle);
|
|
}
|
|
}
|
|
else {
|
|
proto_item *item;
|
|
item = proto_tree_add_text(reqresp_tree,
|
|
tvb, offset - linelen - 1, linelen, "Invalid EPRT arguments");
|
|
expert_add_info_format(pinfo, item, PI_MALFORMED, PI_WARN,
|
|
"EPRT arguments must have the form: |<family>|<addr>|<port>|");
|
|
}
|
|
}
|
|
|
|
if (is_epasv_response) {
|
|
if (linelen != 0) {
|
|
proto_item *addr_it;
|
|
/*
|
|
* RFC2428 - sect. 3
|
|
* This frame contains an EPSV response; set up a
|
|
* conversation for the data.
|
|
*/
|
|
if (parse_extended_pasv_response(line, linelen,
|
|
&ftp_port, &pasv_offset, &ftp_port_len)) {
|
|
/* Add IP address and port number to tree */
|
|
|
|
if (ftp_ip_address.type == AT_IPv4) {
|
|
guint32 addr;
|
|
memcpy(&addr, ftp_ip_address.data, 4);
|
|
addr_it = proto_tree_add_ipv4(reqresp_tree,
|
|
hf_ftp_epsv_ip, tvb, 0, 0, addr);
|
|
PROTO_ITEM_SET_GENERATED(addr_it);
|
|
}
|
|
else if (ftp_ip_address.type == AT_IPv6) {
|
|
addr_it = proto_tree_add_ipv6(reqresp_tree,
|
|
hf_ftp_epsv_ipv6, tvb, 0, 0,
|
|
(guint8*)ftp_ip_address.data);
|
|
PROTO_ITEM_SET_GENERATED(addr_it);
|
|
}
|
|
|
|
proto_tree_add_uint(reqresp_tree,
|
|
hf_ftp_epsv_port, tvb, pasv_offset + 4,
|
|
ftp_port_len, ftp_port);
|
|
|
|
/* Find/create conversation for data */
|
|
conversation = find_conversation(pinfo->fd->num, &ftp_ip_address,
|
|
&pinfo->dst, PT_TCP, ftp_port, 0,
|
|
NO_PORT_B);
|
|
if (conversation == NULL) {
|
|
conversation = conversation_new(
|
|
pinfo->fd->num, &ftp_ip_address, &pinfo->dst,
|
|
PT_TCP, ftp_port, 0, NO_PORT2);
|
|
conversation_set_dissector(conversation,
|
|
ftpdata_handle);
|
|
}
|
|
}
|
|
else {
|
|
proto_item *item;
|
|
item = proto_tree_add_text(reqresp_tree,
|
|
tvb, offset - linelen - 1, linelen, "Invalid EPSV arguments");
|
|
expert_add_info_format(pinfo, item, PI_MALFORMED, PI_WARN,
|
|
"EPSV arguments must have the form (|||<port>|)");
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Show the rest of the request or response as text,
|
|
* a line at a time.
|
|
* XXX - only if there's a continuation indicator?
|
|
*/
|
|
while (tvb_offset_exists(tvb, offset)) {
|
|
/*
|
|
* Find the end of the line.
|
|
*/
|
|
tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
|
|
|
|
/*
|
|
* Put this line.
|
|
*/
|
|
proto_tree_add_text(ftp_tree, tvb, offset,
|
|
next_offset - offset, "%s",
|
|
tvb_format_text(tvb, offset, next_offset - offset));
|
|
offset = next_offset;
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_ftpdata(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_item *ti;
|
|
int data_length;
|
|
gboolean is_text = TRUE;
|
|
gint check_chars, i;
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "FTP-DATA");
|
|
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "FTP Data: %u bytes",
|
|
tvb_reported_length(tvb));
|
|
|
|
data_length = tvb_length(tvb);
|
|
|
|
ti = proto_tree_add_item(tree, proto_ftp_data, tvb, 0, -1, ENC_NA);
|
|
|
|
/* Check the first few chars to see whether it looks like a text file or not */
|
|
check_chars = MIN(10, data_length);
|
|
for (i=0; i < check_chars; i++) {
|
|
if (!isprint(tvb_get_guint8(tvb, i))) {
|
|
is_text = FALSE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (is_text) {
|
|
/* Show as string, but don't format more text than will be displayed */
|
|
proto_item_append_text(ti, " (%s)", tvb_format_text(tvb, 0, MIN(data_length, ITEM_LABEL_LENGTH)));
|
|
}
|
|
else {
|
|
/* Assume binary, just show the number of bytes */
|
|
proto_item_append_text(ti, " (%u bytes data)", data_length);
|
|
}
|
|
}
|
|
|
|
void
|
|
proto_register_ftp(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_ftp_response,
|
|
{ "Response", "ftp.response",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"TRUE if FTP response", HFILL }},
|
|
|
|
{ &hf_ftp_request,
|
|
{ "Request", "ftp.request",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"TRUE if FTP request", HFILL }},
|
|
|
|
{ &hf_ftp_request_command,
|
|
{ "Request command", "ftp.request.command",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_ftp_request_arg,
|
|
{ "Request arg", "ftp.request.arg",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_ftp_response_code,
|
|
{ "Response code", "ftp.response.code",
|
|
FT_UINT32, BASE_DEC|BASE_EXT_STRING, &response_table_ext, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_ftp_response_arg,
|
|
{ "Response arg", "ftp.response.arg",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_ftp_pasv_ip,
|
|
{ "Passive IP address", "ftp.passive.ip",
|
|
FT_IPv4, BASE_NONE, NULL,0x0,
|
|
"Passive IP address (check NAT)", HFILL}},
|
|
|
|
{ &hf_ftp_pasv_port,
|
|
{ "Passive port", "ftp.passive.port",
|
|
FT_UINT16, BASE_DEC, NULL,0x0,
|
|
"Passive FTP server port", HFILL }},
|
|
|
|
{ &hf_ftp_pasv_nat,
|
|
{"Passive IP NAT", "ftp.passive.nat",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"NAT is active SIP and passive IP different", HFILL }},
|
|
|
|
{ &hf_ftp_active_ip,
|
|
{ "Active IP address", "ftp.active.cip",
|
|
FT_IPv4, BASE_NONE, NULL, 0x0,
|
|
"Active FTP client IP address", HFILL }},
|
|
|
|
{ &hf_ftp_active_port,
|
|
{"Active port", "ftp.active.port",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Active FTP client port", HFILL }},
|
|
|
|
{ &hf_ftp_active_nat,
|
|
{ "Active IP NAT", "ftp.active.nat",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"NAT is active", HFILL}},
|
|
|
|
{ &hf_ftp_eprt_af,
|
|
{ "Extended active address family", "ftp.eprt.af",
|
|
FT_UINT8, BASE_DEC, VALS(eprt_af_vals), 0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_ftp_eprt_ip,
|
|
{ "Extended active IP address", "ftp.eprt.ip",
|
|
FT_IPv4, BASE_NONE, NULL, 0,
|
|
"Extended active FTP client IPv4 address", HFILL }},
|
|
|
|
{ &hf_ftp_eprt_ipv6,
|
|
{ "Extended active IPv6 address", "ftp.eprt.ipv6",
|
|
FT_IPv6, BASE_NONE, NULL, 0,
|
|
"Extended active FTP client IPv6 address", HFILL }},
|
|
|
|
{ &hf_ftp_eprt_port,
|
|
{ "Extended active port", "ftp.eprt.port",
|
|
FT_UINT16, BASE_DEC, NULL, 0,
|
|
"Extended active FTP client listener port", HFILL }},
|
|
|
|
{ &hf_ftp_epsv_ip,
|
|
{ "Extended passive IPv4 address", "ftp.epsv.ip",
|
|
FT_IPv4, BASE_NONE, NULL, 0,
|
|
"Extended passive FTP server IPv4 address", HFILL }},
|
|
|
|
{ &hf_ftp_epsv_ipv6,
|
|
{ "Extended passive IPv6 address", "ftp.epsv.ipv6",
|
|
FT_IPv6, BASE_NONE, NULL, 0,
|
|
"Extended passive FTP server IPv6 address", HFILL }},
|
|
|
|
{ &hf_ftp_epsv_port,
|
|
{ "Extended passive port", "ftp.epsv.port",
|
|
FT_UINT16, BASE_DEC, NULL, 0,
|
|
"Extended passive FTP server port", HFILL }}
|
|
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_ftp,
|
|
&ett_ftp_reqresp
|
|
};
|
|
|
|
proto_ftp = proto_register_protocol("File Transfer Protocol (FTP)", "FTP",
|
|
"ftp");
|
|
register_dissector("ftp", dissect_ftp, proto_ftp);
|
|
proto_ftp_data = proto_register_protocol("FTP Data", "FTP-DATA", "ftp-data");
|
|
register_dissector("ftp-data", dissect_ftpdata, proto_ftp_data);
|
|
proto_register_field_array(proto_ftp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_ftp(void)
|
|
{
|
|
dissector_handle_t ftp_handle;
|
|
|
|
ftpdata_handle = find_dissector("ftp-data");
|
|
dissector_add_uint("tcp.port", TCP_PORT_FTPDATA, ftpdata_handle);
|
|
ftp_handle = find_dissector("ftp");
|
|
dissector_add_uint("tcp.port", TCP_PORT_FTP, ftp_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 4
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=4 expandtab:
|
|
* :indentSize=4:tabSize=4:noTabs=true:
|
|
*/
|