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wireshark/epan/dissectors/packet-smtp.c

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/* packet-smtp.c
* Routines for SMTP packet disassembly
*
* $Id$
*
* Copyright (c) 2000 by Richard Sharpe <rsharpe@ns.aus.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1999 Gerald Combs
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <time.h>
#include <glib.h>
#include <string.h>
#include <epan/packet.h>
#include <epan/conversation.h>
#include <epan/addr_resolv.h>
#include <epan/prefs.h>
#include <epan/strutil.h>
#include <epan/emem.h>
#include <epan/reassemble.h>
/* RFC 2821 */
#define TCP_PORT_SMTP 25
/* RFC 4409 */
#define TCP_PORT_SUBMISSION 587
static int proto_smtp = -1;
static int hf_smtp_req = -1;
static int hf_smtp_rsp = -1;
static int hf_smtp_req_command = -1;
static int hf_smtp_req_parameter = -1;
static int hf_smtp_rsp_code = -1;
static int hf_smtp_rsp_parameter = -1;
static int hf_smtp_data_fragments = -1;
static int hf_smtp_data_fragment = -1;
static int hf_smtp_data_fragment_overlap = -1;
static int hf_smtp_data_fragment_overlap_conflicts = -1;
static int hf_smtp_data_fragment_multiple_tails = -1;
static int hf_smtp_data_fragment_too_long_fragment = -1;
static int hf_smtp_data_fragment_error = -1;
static int hf_smtp_data_reassembled_in = -1;
static int ett_smtp = -1;
static int ett_smtp_cmdresp = -1;
static gint ett_smtp_data_fragment = -1;
static gint ett_smtp_data_fragments = -1;
/* desegmentation of SMTP command and response lines */
static gboolean smtp_desegment = TRUE;
static gboolean smtp_data_desegment = TRUE;
static GHashTable *smtp_data_segment_table = NULL;
static GHashTable *smtp_data_reassembled_table = NULL;
static const fragment_items smtp_data_frag_items = {
/* Fragment subtrees */
&ett_smtp_data_fragment,
&ett_smtp_data_fragments,
/* Fragment fields */
&hf_smtp_data_fragments,
&hf_smtp_data_fragment,
&hf_smtp_data_fragment_overlap,
&hf_smtp_data_fragment_overlap_conflicts,
&hf_smtp_data_fragment_multiple_tails,
&hf_smtp_data_fragment_too_long_fragment,
&hf_smtp_data_fragment_error,
/* Reassembled in field */
&hf_smtp_data_reassembled_in,
/* Tag */
"DATA fragments"
};
static dissector_handle_t imf_handle = NULL;
/*
* A CMD is an SMTP command, MESSAGE is the message portion, and EOM is the
* last part of a message
*/
#define SMTP_PDU_CMD 0
#define SMTP_PDU_MESSAGE 1
#define SMTP_PDU_EOM 2
struct smtp_proto_data {
guint16 pdu_type;
guint16 conversation_id;
gboolean more_frags;
};
/*
* State information stored with a conversation.
*/
struct smtp_request_val {
gboolean reading_data; /* Reading message data, not commands */
gboolean crlf_seen; /* Have we seen a CRLF on the end of a packet */
gboolean data_seen; /* Have we seen a DATA command yet */
guint32 msg_read_len; /* Length of BDAT message read so far */
guint32 msg_tot_len; /* Total length of BDAT message */
gboolean msg_last; /* Is this the last BDAT chunk */
};
static void dissect_smtp_data(tvbuff_t *tvb, int offset, proto_tree *smtp_tree)
{
gint next_offset;
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(smtp_tree, tvb, offset, next_offset - offset,
"Message: %s",
tvb_format_text(tvb, offset, next_offset - offset));
/*
* Step to the next line.
*/
offset = next_offset;
}
}
static void
dissect_smtp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
struct smtp_proto_data *frame_data;
proto_tree *smtp_tree;
proto_tree *cmdresp_tree;
proto_item *ti;
int offset = 0;
int request = 0;
conversation_t *conversation;
struct smtp_request_val *request_val;
const guchar *line;
guint32 code;
int linelen = 0;
gint length_remaining;
gboolean eom_seen = FALSE;
gint next_offset;
gint loffset;
gboolean is_continuation_line;
int cmdlen;
fragment_data *frag_msg = NULL;
tvbuff_t *next_tvb;
/* As there is no guarantee that we will only see frames in the
* the SMTP conversation once, and that we will see them in
* order - in Wireshark, the user could randomly click on frames
* in the conversation in any order in which they choose - we
* have to store information with each frame indicating whether
* it contains commands or data or an EOM indication.
*
* XXX - what about frames that contain *both*? TCP is a
* byte-stream protocol, and there are no guarantees that
* TCP segment boundaries will correspond to SMTP commands
* or EOM indications.
*
* We only need that for the client->server stream; responses
* are easy to manage.
*
* If we have per frame data, use that, else, we must be on the first
* pass, so we figure it out on the first pass.
*/
/* Find out what conversation this packet is part of ... but only
* if we have no information on this packet, so find the per-frame
* info first.
*/
/* SMTP messages have a simple format ... */
request = pinfo -> destport == pinfo -> match_port;
/*
* Get the first line from the buffer.
*
* Note that "tvb_find_line_end()" will, if it doesn't return
* -1, return a value that is not longer than what's in the buffer,
* and "tvb_find_line_end()" will always return a value that is not
* longer than what's in the buffer, so the "tvb_get_ptr()" call
* won't throw an exception.
*/
frame_data = p_get_proto_data(pinfo->fd, proto_smtp);
if (!frame_data) {
conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst, pinfo->ptype,
pinfo->srcport, pinfo->destport, 0);
if (conversation == NULL) { /* No conversation, create one */
conversation = conversation_new(pinfo->fd->num, &pinfo->src, &pinfo->dst, pinfo->ptype,
pinfo->srcport, pinfo->destport, 0);
}
/*
* Is there a request structure attached to this conversation?
*/
request_val = conversation_get_proto_data(conversation, proto_smtp);
if (!request_val) {
/*
* No - create one and attach it.
*/
request_val = se_alloc(sizeof(struct smtp_request_val));
request_val->reading_data = FALSE;
request_val->crlf_seen = FALSE;
request_val->data_seen = FALSE;
request_val->msg_read_len = 0;
request_val->msg_tot_len = 0;
request_val->msg_last = TRUE;
conversation_add_proto_data(conversation, proto_smtp, request_val);
}
if(request) {
frame_data = se_alloc(sizeof(struct smtp_proto_data));
frame_data->conversation_id = conversation->index;
frame_data->more_frags = TRUE;
p_add_proto_data(pinfo->fd, proto_smtp, frame_data);
}
loffset = offset;
while (tvb_offset_exists(tvb, loffset)) {
linelen = tvb_find_line_end(tvb, loffset, -1, &next_offset,
smtp_desegment && pinfo->can_desegment);
if (linelen == -1) {
if(offset == loffset) {
/*
* We didn't find a line ending, and we're doing desegmentation;
* tell the TCP dissector where the data for this message starts
* in the data it handed us, and tell it we need one more byte
* (we may need more, but we'll try again if what we get next
* isn't enough), and return.
*/
pinfo->desegment_offset = loffset;
pinfo->desegment_len = 1;
return;
}
else {
linelen = tvb_length_remaining(tvb, loffset);
next_offset = loffset + linelen;
}
}
line = tvb_get_ptr(tvb, loffset, linelen);
/*
* Check whether or not this packet is an end of message packet
* We should look for CRLF.CRLF and they may be split.
* We have to keep in mind that we may see what we want on
* two passes through here ...
*/
if (request_val->reading_data) {
/*
* The order of these is important ... We want to avoid
* cases where there is a CRLF at the end of a packet and a
* .CRLF at the begining of the same packet.
*/
if ((request_val->crlf_seen && tvb_strneql(tvb, loffset, ".\r\n", 3) == 0) ||
tvb_strneql(tvb, loffset, "\r\n.\r\n", 5) == 0) {
eom_seen = TRUE;
}
length_remaining = tvb_length_remaining(tvb, loffset);
if (length_remaining == tvb_reported_length_remaining(tvb, loffset) &&
tvb_strneql(tvb, loffset + length_remaining - 2, "\r\n", 2) == 0) {
request_val->crlf_seen = TRUE;
}
else {
request_val->crlf_seen = FALSE;
}
}
/*
* OK, Check if we have seen a DATA request. We do it here for
* simplicity, but we have to be careful below.
*/
if (request) {
if (request_val->reading_data) {
/*
* This is message data.
*/
if (eom_seen) { /* Seen the EOM */
/*
* EOM.
* Everything that comes after it is commands.
*
* XXX - what if the EOM isn't at the beginning of
* the TCP segment? It can occur anywhere....
*/
frame_data->pdu_type = SMTP_PDU_EOM;
request_val->reading_data = FALSE;
break;
} else {
/*
* Message data with no EOM.
*/
frame_data->pdu_type = SMTP_PDU_MESSAGE;
if (request_val->msg_tot_len > 0) {
/*
* We are handling a BDAT message.
* Check if we have reached end of the data chunk.
*/
request_val->msg_read_len += tvb_length_remaining(tvb, loffset);
if (request_val->msg_read_len == request_val->msg_tot_len) {
/*
* We have reached end of BDAT data chunk.
* Everything that comes after this is commands.
*/
request_val->reading_data = FALSE;
if (request_val->msg_last) {
/*
* We have found the LAST data chunk.
* The message can now be reassembled.
*/
frame_data->more_frags = FALSE;
}
break; /* no need to go through the remaining lines */
}
}
}
} else {
/*
* This is commands - unless the capture started in the
* middle of a session, and we're in the middle of data.
* To quote RFC 821, "Command codes are four alphabetic
* characters"; if we don't see four alphabetic characters
* and, if there's anything else in the line, a space, we
* assume it's not a command.
* (We treat only A-Z and a-z as alphabetic.)
*/
#define ISALPHA(c) (((c) >= 'A' && (c) <= 'Z') || \
((c) >= 'a' && (c) <= 'z'))
if (linelen >= 4 && ISALPHA(line[0]) && ISALPHA(line[1]) &&
ISALPHA(line[2]) && ISALPHA(line[3]) &&
(linelen == 4 || line[4] == ' ')) {
if (g_ascii_strncasecmp(line, "DATA", 4) == 0) {
/*
* DATA command.
* This is a command, but everything that comes after it,
* until an EOM, is data.
*/
frame_data->pdu_type = SMTP_PDU_CMD;
request_val->reading_data = TRUE;
request_val->data_seen = TRUE;
} else if (g_ascii_strncasecmp(line, "BDAT", 4) == 0) {
/*
* BDAT command.
* This is a command, but everything that comes after it,
* until given length is received, is data.
*/
guint32 msg_len;
msg_len = strtoul (line+5, NULL, 10);
frame_data->pdu_type = SMTP_PDU_CMD;
request_val->data_seen = TRUE;
request_val->msg_tot_len += msg_len;
if (msg_len == 0) {
/* No data to read, next will be a command */
request_val->reading_data = FALSE;
} else {
request_val->reading_data = TRUE;
}
if (g_ascii_strncasecmp(line+linelen-4, "LAST", 4) == 0) {
/*
* This is the last data chunk.
*/
request_val->msg_last = TRUE;
if (msg_len == 0) {
/*
* No more data to expect.
* The message can now be reassembled.
*/
frame_data->more_frags = FALSE;
}
} else {
request_val->msg_last = FALSE;
}
} else {
/*
* Regular command.
*/
frame_data->pdu_type = SMTP_PDU_CMD;
}
} else {
if ((linelen >= 7) && line[0] == 'X' && ( (g_ascii_strncasecmp(line, "X-EXPS ", 7) == 0) ||
((linelen >=13) && (g_ascii_strncasecmp(line, "X-LINK2STATE ", 13) == 0)) ||
((linelen >= 8) && (g_ascii_strncasecmp(line, "XEXCH50 ", 8) == 0)) ))
frame_data->pdu_type = SMTP_PDU_CMD;
else
/*
* Assume it's message data.
*/
frame_data->pdu_type = request_val->data_seen ? SMTP_PDU_MESSAGE : SMTP_PDU_CMD;
}
}
}
/*
* Step past this line.
*/
loffset = next_offset;
}
}
/*
* From here, we simply add items to the tree and info to the info
* fields ...
*/
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "SMTP");
if (check_col(pinfo->cinfo, COL_INFO)) { /* Add the appropriate type here */
col_clear(pinfo->cinfo, COL_INFO);
/*
* If it is a request, we have to look things up, otherwise, just
* display the right things
*/
if (request) {
/* We must have frame_data here ... */
switch (frame_data->pdu_type) {
case SMTP_PDU_MESSAGE:
length_remaining = tvb_length_remaining(tvb, offset);
col_set_str(pinfo->cinfo, COL_INFO, smtp_data_desegment ? "C: DATA fragment" : "C: Message Body");
col_append_fstr(pinfo->cinfo, COL_INFO, ", %d byte%s", length_remaining,
plurality (length_remaining, "", "s"));
break;
case SMTP_PDU_EOM:
col_set_str(pinfo->cinfo, COL_INFO, "C: .");
break;
case SMTP_PDU_CMD:
loffset = offset;
while (tvb_offset_exists(tvb, loffset)) {
/*
* Find the end of the line.
*/
linelen = tvb_find_line_end(tvb, loffset, -1, &next_offset, FALSE);
line = tvb_get_ptr(tvb, loffset, linelen);
if(loffset == offset)
col_append_fstr(pinfo->cinfo, COL_INFO, "C: %s",
format_text(line, linelen));
else {
col_append_fstr(pinfo->cinfo, COL_INFO, " | %s",
format_text(line, linelen));
}
loffset = next_offset;
}
break;
}
}
else {
loffset = offset;
while (tvb_offset_exists(tvb, loffset)) {
/*
* Find the end of the line.
*/
linelen = tvb_find_line_end(tvb, loffset, -1, &next_offset, FALSE);
line = tvb_get_ptr(tvb, loffset, linelen);
if(loffset == offset)
col_append_fstr(pinfo->cinfo, COL_INFO, "S: %s",
format_text(line, linelen));
else {
col_append_fstr(pinfo->cinfo, COL_INFO, " | %s",
format_text(line, linelen));
}
loffset = next_offset;
}
}
}
if (tree) { /* Build the tree info ... */
ti = proto_tree_add_item(tree, proto_smtp, tvb, offset, -1, FALSE);
smtp_tree = proto_item_add_subtree(ti, ett_smtp);
if (request) {
/*
* Check out whether or not we can see a command in there ...
* What we are looking for is not data_seen and the word DATA
* and not eom_seen.
*
* We will see DATA and request_val->data_seen when we process the
* tree view after we have seen a DATA packet when processing
* the packet list pane.
*
* On the first pass, we will not have any info on the packets
* On second and subsequent passes, we will.
*/
switch (frame_data->pdu_type) {
case SMTP_PDU_MESSAGE:
if(smtp_data_desegment) {
frag_msg = fragment_add_seq_next (tvb, 0, pinfo, frame_data->conversation_id,
smtp_data_segment_table, smtp_data_reassembled_table,
tvb_length(tvb), frame_data->more_frags);
} else {
/*
* Message body.
* Put its lines into the protocol tree, a line at a time.
*/
dissect_smtp_data(tvb, offset, smtp_tree);
}
break;
case SMTP_PDU_EOM:
/*
* End-of-message-body indicator.
*
* XXX - what about stuff after the first line?
* Unlikely, as the client should wait for a response to the
* DATA command this terminates before sending another
* request, but we should probably handle it.
*/
proto_tree_add_text(smtp_tree, tvb, offset, linelen, "C: .");
if(smtp_data_desegment) {
/* terminate the desegmentation */
frag_msg = fragment_end_seq_next (pinfo, frame_data->conversation_id, smtp_data_segment_table,
smtp_data_reassembled_table);
}
break;
case SMTP_PDU_CMD:
/*
* Command.
*
* XXX - what about stuff after the first line?
* Unlikely, as the client should wait for a response to the
* previous command before sending another request, but we
* should probably handle it.
*/
loffset = offset;
while (tvb_offset_exists(tvb, loffset)) {
/*
* Find the end of the line.
*/
linelen = tvb_find_line_end(tvb, loffset, -1, &next_offset, FALSE);
if (linelen >= 4)
cmdlen = 4;
else
cmdlen = linelen;
proto_tree_add_boolean_hidden(smtp_tree, hf_smtp_req, tvb,
0, 0, TRUE);
/*
* Put the command line into the protocol tree.
*/
ti = proto_tree_add_text(smtp_tree, tvb, loffset, next_offset - loffset,
"Command: %s",
tvb_format_text(tvb, loffset, next_offset - loffset));
cmdresp_tree = proto_item_add_subtree(ti, ett_smtp_cmdresp);
proto_tree_add_item(cmdresp_tree, hf_smtp_req_command, tvb,
loffset, cmdlen, FALSE);
if (linelen > 5) {
proto_tree_add_item(cmdresp_tree, hf_smtp_req_parameter, tvb,
loffset + 5, linelen - 5, FALSE);
}
if (smtp_data_desegment && !frame_data->more_frags) {
/* terminate the desegmentation */
frag_msg = fragment_end_seq_next (pinfo, frame_data->conversation_id, smtp_data_segment_table,
smtp_data_reassembled_table);
}
/*
* Step past this line.
*/
loffset = next_offset;
}
}
if (smtp_data_desegment) {
next_tvb = process_reassembled_data (tvb, offset, pinfo, "Reassembled DATA",
frag_msg, &smtp_data_frag_items, NULL, smtp_tree);
if (next_tvb) {
/* XXX: this is presumptious - we may have negotiated something else */
if(imf_handle) {
call_dissector(imf_handle, next_tvb, pinfo, tree);
} else {
/*
* Message body.
* Put its lines into the protocol tree, a line at a time.
*/
dissect_smtp_data(tvb, offset, smtp_tree);
}
pinfo->fragmented = FALSE;
} else {
pinfo->fragmented = TRUE;
}
}
}
else {
/*
* Process the response, a line at a time, until we hit a line
* that doesn't have a continuation indication on it.
*/
proto_tree_add_boolean_hidden(smtp_tree, hf_smtp_rsp, tvb,
0, 0, TRUE);
while (tvb_offset_exists(tvb, offset)) {
/*
* Find the end of the line.
*/
linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
/*
* Put it into the protocol tree.
*/
ti = proto_tree_add_text(smtp_tree, tvb, offset,
next_offset - offset, "Response: %s",
tvb_format_text(tvb, offset,
next_offset - offset));
cmdresp_tree = proto_item_add_subtree(ti, ett_smtp_cmdresp);
/*
* Is it a continuation line?
*/
is_continuation_line =
(linelen >= 4 && tvb_get_guint8(tvb, offset + 3) == '-');
/*
* Put the response code and parameters into the protocol tree.
*/
line = tvb_get_ptr(tvb, offset, linelen);
if (linelen >= 3 && isdigit(line[0]) && isdigit(line[1])
&& isdigit(line[2])) {
/*
* We have a 3-digit response code.
*/
code = (line[0] - '0')*100 + (line[1] - '0')*10 + (line[2] - '0');
proto_tree_add_uint(cmdresp_tree, hf_smtp_rsp_code, tvb, offset, 3,
code);
if (linelen >= 4) {
proto_tree_add_item(cmdresp_tree, hf_smtp_rsp_parameter, tvb,
offset + 4, linelen - 4, FALSE);
}
}
/*
* Step past this line.
*/
offset = next_offset;
/*
* If it's not a continuation line, quit.
*/
/* if (!is_continuation_line)
break; */
}
}
}
}
static void smtp_data_reassemble_init (void)
{
fragment_table_init (&smtp_data_segment_table);
reassembled_table_init (&smtp_data_reassembled_table);
}
/* Register all the bits needed by the filtering engine */
void
proto_register_smtp(void)
{
static hf_register_info hf[] = {
{ &hf_smtp_req,
{ "Request", "smtp.req", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }},
{ &hf_smtp_rsp,
{ "Response", "smtp.rsp", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }},
{ &hf_smtp_req_command,
{ "Command", "smtp.req.command", FT_STRING, BASE_NONE, NULL, 0x0,
"", HFILL }},
{ &hf_smtp_req_parameter,
{ "Request parameter", "smtp.req.parameter", FT_STRING, BASE_NONE, NULL, 0x0,
"", HFILL }},
{ &hf_smtp_rsp_code,
{ "Response code", "smtp.response.code", FT_UINT32, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_smtp_rsp_parameter,
{ "Response parameter", "smtp.rsp.parameter", FT_STRING, BASE_NONE, NULL, 0x0,
"", HFILL }},
/* Fragment entries */
{ &hf_smtp_data_fragments,
{ "DATA fragments", "smtp.data.fragments", FT_NONE, BASE_NONE,
NULL, 0x00, "Message fragments", HFILL } },
{ &hf_smtp_data_fragment,
{ "DATA fragment", "smtp.data.fragment", FT_FRAMENUM, BASE_NONE,
NULL, 0x00, "Message fragment", HFILL } },
{ &hf_smtp_data_fragment_overlap,
{ "DATA fragment overlap", "smtp.data.fragment.overlap", FT_BOOLEAN,
BASE_NONE, NULL, 0x00, "Message fragment overlap", HFILL } },
{ &hf_smtp_data_fragment_overlap_conflicts,
{ "DATA fragment overlapping with conflicting data",
"smtp.data.fragment.overlap.conflicts", FT_BOOLEAN, BASE_NONE, NULL,
0x00, "Message fragment overlapping with conflicting data", HFILL } },
{ &hf_smtp_data_fragment_multiple_tails,
{ "DATA has multiple tail fragments",
"smtp.data.fragment.multiple_tails", FT_BOOLEAN, BASE_NONE,
NULL, 0x00, "Message has multiple tail fragments", HFILL } },
{ &hf_smtp_data_fragment_too_long_fragment,
{ "DATA fragment too long", "smtp.data.fragment.too_long_fragment",
FT_BOOLEAN, BASE_NONE, NULL, 0x00, "Message fragment too long",
HFILL } },
{ &hf_smtp_data_fragment_error,
{ "DATA defragmentation error", "smtp.data.fragment.error", FT_FRAMENUM,
BASE_NONE, NULL, 0x00, "Message defragmentation error", HFILL } },
{ &hf_smtp_data_reassembled_in,
{ "Reassembled DATA in frame", "smtp.data.reassembled.in", FT_FRAMENUM, BASE_NONE,
NULL, 0x00, "This DATA fragment is reassembled in this frame", HFILL } },
};
static gint *ett[] = {
&ett_smtp,
&ett_smtp_cmdresp,
&ett_smtp_data_fragment,
&ett_smtp_data_fragments,
};
module_t *smtp_module;
proto_smtp = proto_register_protocol("Simple Mail Transfer Protocol",
"SMTP", "smtp");
proto_register_field_array(proto_smtp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_init_routine (&smtp_data_reassemble_init);
/* Allow dissector to find be found by name. */
register_dissector("smtp", dissect_smtp, proto_smtp);
/* Preferences */
smtp_module = prefs_register_protocol(proto_smtp, NULL);
prefs_register_bool_preference(smtp_module, "desegment_lines",
"Reassemble SMTP command and response lines\nspanning multiple TCP segments",
"Whether the SMTP dissector should reassemble command and response lines spanning multiple TCP segments."
" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
&smtp_desegment);
prefs_register_bool_preference(smtp_module, "desegment_data",
"Reassemble SMTP DATA commands spanning multiple TCP segments",
"Whether the SMTP dissector should reassemble DATA command and lines spanning multiple TCP segments."
" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
&smtp_data_desegment);
}
/* The registration hand-off routine */
void
proto_reg_handoff_smtp(void)
{
dissector_handle_t smtp_handle;
smtp_handle = create_dissector_handle(dissect_smtp, proto_smtp);
dissector_add("tcp.port", TCP_PORT_SMTP, smtp_handle);
dissector_add("tcp.port", TCP_PORT_SUBMISSION, smtp_handle);
/* find the IMF dissector */
imf_handle = find_dissector("imf");
}
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