![Guy Harris](/assets/img/avatar_default.png)
argument to "tvb_new_subset()" - just use -1 if the subset tvbuff is to run to the end of the parent tvbuff. svn path=/trunk/; revision=5597
308 lines
7.2 KiB
C
308 lines
7.2 KiB
C
/* packet-icap.c
|
|
* Routines for ICAP packet disassembly
|
|
*
|
|
* Srishylam Simharajan simha@netapp.com
|
|
*
|
|
* packet-icap.c Mon Aug 13 17:50:19 PDT 2001 simha
|
|
*
|
|
* Ethereal - Network traffic analyzer
|
|
* By Gerald Combs <gerald@ethereal.com>
|
|
* Copyright 1998 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
|
|
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
|
|
#include <glib.h>
|
|
#include <epan/packet.h>
|
|
#include <epan/strutil.h>
|
|
|
|
typedef enum _icap_type {
|
|
ICAP_OPTIONS,
|
|
ICAP_REQMOD,
|
|
ICAP_RESPMOD,
|
|
ICAP_RESPONSE,
|
|
ICAP_OTHER
|
|
} icap_type_t;
|
|
|
|
static int proto_icap = -1;
|
|
static int hf_icap_response = -1;
|
|
static int hf_icap_reqmod = -1;
|
|
static int hf_icap_respmod = -1;
|
|
static int hf_icap_options = -1;
|
|
static int hf_icap_other = -1;
|
|
|
|
static gint ett_icap = -1;
|
|
|
|
static dissector_handle_t data_handle;
|
|
|
|
#define TCP_PORT_ICAP 1344
|
|
static int is_icap_message(const u_char *data, int linelen, icap_type_t *type);
|
|
static void
|
|
dissect_icap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_tree *icap_tree = NULL;
|
|
proto_item *ti = NULL;
|
|
gint offset = 0;
|
|
const u_char *line;
|
|
gint next_offset;
|
|
const u_char *linep, *lineend;
|
|
int linelen;
|
|
u_char c;
|
|
icap_type_t icap_type;
|
|
int datalen;
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ICAP");
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
/*
|
|
* Put the first line from the buffer into the summary
|
|
* if it's an ICAP header (but leave out the
|
|
* line terminator).
|
|
* Otherwise, just call it a continuation.
|
|
*
|
|
* 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, offset, -1, &next_offset);
|
|
line = tvb_get_ptr(tvb, offset, linelen);
|
|
icap_type = ICAP_OTHER; /* type not known yet */
|
|
if (is_icap_message(line, linelen, &icap_type))
|
|
col_add_str(pinfo->cinfo, COL_INFO,
|
|
format_text(line, linelen));
|
|
else
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Continuation");
|
|
}
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_icap, tvb, offset, -1,
|
|
FALSE);
|
|
icap_tree = proto_item_add_subtree(ti, ett_icap);
|
|
}
|
|
|
|
/*
|
|
* Process the packet data, a line at a time.
|
|
*/
|
|
icap_type = ICAP_OTHER; /* type not known yet */
|
|
while (tvb_offset_exists(tvb, offset)) {
|
|
gboolean is_icap = FALSE;
|
|
gboolean loop_done = FALSE;
|
|
/*
|
|
* Find the end of the line.
|
|
*/
|
|
linelen = tvb_find_line_end(tvb, offset, -1, &next_offset);
|
|
|
|
/*
|
|
* Get a buffer that refers to the line.
|
|
*/
|
|
line = tvb_get_ptr(tvb, offset, linelen);
|
|
lineend = line + linelen;
|
|
|
|
/*
|
|
* find header format
|
|
*/
|
|
if (is_icap_message(line, linelen, &icap_type)) {
|
|
is_icap = TRUE;
|
|
goto is_icap_header;
|
|
}
|
|
|
|
/*
|
|
* if it looks like a blank line, end of header perhaps?
|
|
*/
|
|
if (linelen == 0) {
|
|
is_icap = TRUE;
|
|
goto is_icap_header;
|
|
}
|
|
|
|
/*
|
|
* No. Does it look like a MIME header?
|
|
*/
|
|
linep = line;
|
|
loop_done = FALSE;
|
|
while (linep < lineend && (!loop_done)) {
|
|
c = *linep++;
|
|
if (!isprint(c)) {
|
|
is_icap = FALSE;
|
|
break; /* not printable, not a MIME header */
|
|
}
|
|
switch (c) {
|
|
case ':':
|
|
is_icap = TRUE;
|
|
goto is_icap_header;
|
|
break;
|
|
case '(':
|
|
case ')':
|
|
case '<':
|
|
case '>':
|
|
case '@':
|
|
case ',':
|
|
case ';':
|
|
case '\\':
|
|
case '"':
|
|
case '/':
|
|
case '[':
|
|
case ']':
|
|
case '?':
|
|
case '=':
|
|
case '{':
|
|
case '}':
|
|
is_icap = FALSE;
|
|
loop_done = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We don't consider this part of an ICAP message,
|
|
* so we don't display it.
|
|
* (Yeah, that means we don't display, say, a text/icap
|
|
* page, but you can get that from the data pane.)
|
|
*/
|
|
if (!is_icap)
|
|
break;
|
|
is_icap_header:
|
|
if (tree) {
|
|
proto_tree_add_text(icap_tree, tvb, offset,
|
|
next_offset - offset, "%s",
|
|
tvb_format_text(tvb, offset,
|
|
next_offset - offset)
|
|
);
|
|
}
|
|
offset = next_offset;
|
|
}
|
|
|
|
if (tree) {
|
|
switch (icap_type) {
|
|
|
|
case ICAP_OPTIONS:
|
|
proto_tree_add_boolean_hidden(icap_tree,
|
|
hf_icap_options, tvb, 0, 0, 1);
|
|
break;
|
|
|
|
case ICAP_REQMOD:
|
|
proto_tree_add_boolean_hidden(icap_tree,
|
|
hf_icap_reqmod, tvb, 0, 0, 1);
|
|
break;
|
|
|
|
case ICAP_RESPMOD:
|
|
proto_tree_add_boolean_hidden(icap_tree,
|
|
hf_icap_respmod, tvb, 0, 0, 1);
|
|
break;
|
|
|
|
case ICAP_RESPONSE:
|
|
proto_tree_add_boolean_hidden(icap_tree,
|
|
hf_icap_response, tvb, 0, 0, 1);
|
|
break;
|
|
|
|
case ICAP_OTHER:
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
datalen = tvb_length_remaining(tvb, offset);
|
|
if (datalen > 0) {
|
|
call_dissector(data_handle,
|
|
tvb_new_subset(tvb, offset, -1, -1), pinfo, icap_tree);
|
|
}
|
|
}
|
|
|
|
|
|
static int
|
|
is_icap_message(const u_char *data, int linelen, icap_type_t *type)
|
|
{
|
|
#define ICAP_COMPARE(string, length, msgtype) { \
|
|
if (strncmp(data, string, length) == 0) { \
|
|
if (*type == ICAP_OTHER) \
|
|
*type = msgtype; \
|
|
return TRUE; \
|
|
} \
|
|
}
|
|
/*
|
|
* From draft-elson-opes-icap-01(72).txt
|
|
*/
|
|
if (linelen >= 5) {
|
|
ICAP_COMPARE("ICAP/", 5, ICAP_RESPONSE); /* response */
|
|
}
|
|
if (linelen >= 7) {
|
|
ICAP_COMPARE("REQMOD ", 7, ICAP_REQMOD); /* request mod */
|
|
}
|
|
if (linelen >= 8) {
|
|
ICAP_COMPARE("OPTIONS ", 8, ICAP_OPTIONS); /* options */
|
|
ICAP_COMPARE("RESPMOD ", 8, ICAP_RESPMOD); /* response mod */
|
|
}
|
|
return FALSE;
|
|
#undef ICAP_COMPARE
|
|
}
|
|
|
|
void
|
|
proto_register_icap(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_icap_response,
|
|
{ "Response", "icap.response",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"TRUE if ICAP response", HFILL }},
|
|
{ &hf_icap_reqmod,
|
|
{ "Reqmod", "icap.reqmod",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"TRUE if ICAP reqmod", HFILL }},
|
|
{ &hf_icap_respmod,
|
|
{ "Respmod", "icap.respmod",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"TRUE if ICAP respmod", HFILL }},
|
|
{ &hf_icap_options,
|
|
{ "Options", "icap.options",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"TRUE if ICAP options", HFILL }},
|
|
{ &hf_icap_other,
|
|
{ "Other", "icap.other",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"TRUE if ICAP other", HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_icap,
|
|
};
|
|
|
|
proto_icap = proto_register_protocol(
|
|
"Internet Content Adaptation Protocol",
|
|
"ICAP", "icap");
|
|
proto_register_field_array(proto_icap, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_icap(void)
|
|
{
|
|
dissector_handle_t icap_handle;
|
|
|
|
data_handle = find_dissector("data");
|
|
icap_handle = create_dissector_handle(dissect_icap, proto_icap);
|
|
dissector_add("tcp.port", TCP_PORT_ICAP, icap_handle);
|
|
}
|