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/* packet-smtp.c
* Routines for SMTP packet disassembly
*
* $Id: packet-smtp.c,v 1.3 2000/08/20 15:25:17 deniel Exp $
*
* Copyright (c) 2000 by Richard Sharpe <rsharpe@ns.aus.com>
*
* Ethereal - Network traffic analyzer
* By Gerald Combs
* 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
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <time.h>
#include <glib.h>
#include <string.h>
#include "packet.h"
#include "resolv.h"
#include "prefs.h"
#define TCP_PORT_SMTP 25
void proto_reg_handoff_smtp(void);
static int proto_smtp = -1;
static int hf_smtp_req = -1;
static int hf_smtp_rsp = -1;
static int ett_smtp = -1;
static int global_smtp_tcp_port = TCP_PORT_SMTP;
static
int find_smtp_resp_end(const u_char *pd, int offset)
{
int cntr = 0;
/* Look for the CRLF ... but keep in mind the END_OF_FRAME */
while (END_OF_FRAME >= cntr) {
if (pd[offset + cntr] == 0x0A) { /* Found it */
if (END_OF_FRAME >= cntr + 1) cntr++;
return cntr;
}
cntr++;
}
return cntr;
}
#if 0
static void
dissect_smtp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
#else
static void
dissect_smtp(const u_char *pd, int offset, frame_data *fd,
proto_tree *tree)
{
/* tvbuff_t *tvb = tvb_create_from_top(offset);*/
packet_info *pinfo = π
#endif
void *frame_data;
proto_tree *smtp_tree, *ti;
int request = 0;
const u_char *cmd = NULL, *data = NULL;
#if 0
CHECK_DISPLAY_AS_DATA(proto_smtp, tvb, pinfo, tree);
#else
OLD_CHECK_DISPLAY_AS_DATA(proto_smtp, pd, offset, fd, tree);
#endif
/* Let's figure out this packet ... First check if we have done it
all before ... */
frame_data = p_get_proto_data(pinfo->fd, proto_smtp);
/* SMTP messages have a simple format ... */
if (!frame_data) { /* We parse the frame and create the data */
request = pinfo -> destport == TCP_PORT_SMTP;
cmd = pd + offset; /* FIXME: What about tvb */
data = strchr(cmd, ' '); /* Find the space */
if (data) data++; /* Skip the space if there */
}
else {
}
if (check_col(fd, COL_PROTOCOL))
col_add_str(fd, COL_PROTOCOL, "SMTP");
if (check_col(fd, COL_INFO)) { /* Add the appropriate type here */
col_add_fstr(fd, COL_INFO, "%s", format_text(cmd, END_OF_FRAME));
}
if (tree) { /* Build the tree info ... */
ti = proto_tree_add_item(tree, proto_smtp, NullTVB, offset, END_OF_FRAME, FALSE);
smtp_tree = proto_item_add_subtree(ti, ett_smtp);
proto_tree_add_boolean_hidden(smtp_tree, (request ? hf_smtp_req : hf_smtp_rsp),
NullTVB, offset, 4, TRUE);
if (request) {
proto_tree_add_protocol_format(smtp_tree, proto_smtp, NullTVB, offset, 4, "Command: %s", format_text(cmd, 4));
proto_tree_add_protocol_format(smtp_tree, proto_smtp, NullTVB, offset + 5, END_OF_FRAME, "Parameter: %s", format_text(cmd + 5, END_OF_FRAME - 5));
}
else {
/* Must consider a multi-line response here ... */
while (END_OF_FRAME >= 4 && pd[offset + 3] == '-') {
int resp_len = find_smtp_resp_end(pd, offset);
proto_tree_add_protocol_format(smtp_tree, proto_smtp, NullTVB, offset, 3, "Response: %s", format_text(pd + offset, 3));
proto_tree_add_protocol_format(smtp_tree, proto_smtp, NullTVB, offset + 4, resp_len, "Parameter: %s", format_text(pd + offset + 4, resp_len - 4));
offset += resp_len;
}
proto_tree_add_protocol_format(smtp_tree, proto_smtp, NullTVB, offset, 3, "Response: %s", format_text(pd + offset, 3));
proto_tree_add_protocol_format(smtp_tree, proto_smtp, NullTVB, offset + 4, END_OF_FRAME, "Parameter: %s", format_text(pd + offset + 4, END_OF_FRAME - 4));
}
}
}
/* 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, ""}},
{ &hf_smtp_rsp,
{ "Response", "smtp.rsp", FT_BOOLEAN, BASE_NONE, NULL, 0x0, ""}},
};
static gint *ett[] = {
&ett_smtp
};
/*module_t *smtp_module = NULL; */ /* Not yet used */
/* No Configuration options to register? */
proto_smtp = proto_register_protocol("Simple Mail Transfer Protocol", "smtp");
proto_register_field_array(proto_smtp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
/* The registration hand-off routine */
void
proto_reg_handoff_smtp(void)
{
static int smtp_prefs_initialized = FALSE;
static int tcp_port = 0;
if (smtp_prefs_initialized) {
old_dissector_delete("tcp.port", tcp_port, dissect_smtp);
}
else {
smtp_prefs_initialized = TRUE;
}
tcp_port = global_smtp_tcp_port;
old_dissector_add("tcp.port", global_smtp_tcp_port, dissect_smtp);
}
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