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/* packet-acap.c
* Routines for ACAP packet dissection
* RFC 2244
* Copyright 2003, Brad Hards <bradh@frogmouth.net>
* Heavily based in packet-imap.c, Copyright 1999, Richard Sharpe <rsharpe@ns.aus.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* Copied from packet-imap.c
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/strutil.h>
/* Forward declarations */
void proto_register_acap(void);
void proto_reg_handoff_acap(void);
static dissector_handle_t acap_handle;
static int proto_acap;
static int hf_acap_request;
static int hf_acap_request_data;
static int hf_acap_request_tag;
static int hf_acap_response;
static int hf_acap_response_data;
static int hf_acap_response_tag;
static int ett_acap;
static int ett_acap_reqresp;
#define TCP_PORT_ACAP 674
static int
dissect_acap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
bool is_request;
proto_tree *acap_tree, *reqresp_tree;
proto_item *ti, *hidden_item;
int offset = 0;
const unsigned char *line;
int next_offset;
int linelen;
int tokenlen;
const unsigned char *next_token;
/*
* If this should be a request or response, do this quick check to see if
* it begins with a string...
* Otherwise, looking for the end of line in a binary file can take a long time
* and this probably isn't ACAP
*/
if (!g_ascii_isprint(tvb_get_uint8(tvb, offset))) {
return 0;
}
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ACAP");
/*
* 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, offset, -1, &next_offset, false);
line = tvb_get_ptr(tvb, offset, linelen);
if (pinfo->match_uint == pinfo->destport)
is_request = true;
else
is_request = false;
/*
* 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(pinfo->pool, line, linelen));
if (tree) {
ti = proto_tree_add_item(tree, proto_acap, tvb, offset, -1,
ENC_NA);
acap_tree = proto_item_add_subtree(ti, ett_acap);
if (is_request) {
hidden_item = proto_tree_add_boolean(acap_tree,
hf_acap_request, tvb, 0, 0, true);
proto_item_set_hidden(hidden_item);
} else {
hidden_item = proto_tree_add_boolean(acap_tree,
hf_acap_response, tvb, 0, 0, true);
proto_item_set_hidden(hidden_item);
}
/*
* Put the line into the protocol tree.
*/
ti = proto_tree_add_format_text(acap_tree, tvb, offset, next_offset - offset);
reqresp_tree = proto_item_add_subtree(ti, ett_acap_reqresp);
/*
* Show the first line as tags + requests or replies.
*/
/*
* Extract the first token, and, if there is a first
* token, add it as the request or reply tag.
*/
tokenlen = get_token_len(line, line + linelen, &next_token);
if (tokenlen != 0) {
if (is_request) {
proto_tree_add_string(reqresp_tree, hf_acap_request_tag, tvb, offset,
tokenlen, format_text(pinfo->pool, line, tokenlen));
} else {
proto_tree_add_string(reqresp_tree, hf_acap_response_tag, tvb, offset,
tokenlen, format_text(pinfo->pool, line, tokenlen));
}
offset += (int)(next_token - line);
linelen -= (int)(next_token - line);
line = next_token;
}
/*
* Add the rest of the line as request or reply data.
*/
if (linelen != 0) {
if (is_request) {
proto_tree_add_string(reqresp_tree, hf_acap_request_data, tvb, offset,
linelen, format_text(pinfo->pool, line, linelen));
} else {
proto_tree_add_string(reqresp_tree, hf_acap_response_data, tvb, offset,
linelen, format_text(pinfo->pool, line, linelen));
}
}
/*
* XXX - show the rest of the frame; this requires that
* we handle literals, quoted strings, continuation
* responses, etc..
*
* This involves a state machine, and attaching
* state information to the packets.
*/
}
return tvb_captured_length(tvb);
}
void
proto_register_acap(void)
{
static hf_register_info hf[] = {
{ &hf_acap_response,
{ "Response", "acap.response",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"true if ACAP response", HFILL }
},
{ &hf_acap_request,
{ "Request", "acap.request",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"true if ACAP request", HFILL }
},
{ &hf_acap_request_tag,
{ "Request Tag", "acap.request_tag",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_acap_response_tag,
{ "Response Tag", "acap.response_tag",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_acap_request_data,
{ "Request", "acap.request_data",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_acap_response_data,
{ "Response", "acap.response_data",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
};
static int *ett[] = {
&ett_acap,
&ett_acap_reqresp,
};
proto_acap = proto_register_protocol("Application Configuration Access Protocol",
"ACAP", "acap");
proto_register_field_array(proto_acap, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
acap_handle = register_dissector("acap", dissect_acap, proto_acap);
}
void
proto_reg_handoff_acap(void)
{
dissector_add_uint_with_preference("tcp.port", TCP_PORT_ACAP, acap_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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