forked from osmocom/wireshark
![Dario Lombardo](/assets/img/avatar_default.png)
Change-Id: I92c94448e6641716d03158a5f332c8b53709423a Reviewed-on: https://code.wireshark.org/review/25756 Petri-Dish: Dario Lombardo <lomato@gmail.com> Reviewed-by: Anders Broman <a.broman58@gmail.com>
586 lines
18 KiB
C
586 lines
18 KiB
C
/* packet-cattp.c
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* Routines for packet dissection of
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* ETSI TS 102 127 v6.13.0 (Release 6 / 2009-0r45)
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* Card Application Toolkit - Transport Protocol over UDP
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*
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* Copyright 2014-2014 by Sebastian Kloeppel <sk [at] nakedape.net>
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* Cristina E. Vintila <cristina.vintila [at] gmail.com>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/expert.h>
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#include <epan/in_cksum.h>
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#define CATTP_SHORTNAME "CAT-TP"
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#define CATTP_HBLEN 18
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#define F_SYN 0x80
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#define F_ACK 0x40
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#define F_EAK 0x20
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#define F_RST 0x10
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#define F_NUL 0x08
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#define F_SEG 0x04
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/* bit masks for the first header byte. */
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#define M_FLAGS 0xFC /* flags only, no version */
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#define M_PDU_SYN 0xB8 /* SYN (ACK, SEG dont care) without version */
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#define M_PDU_ACK 0xD0 /* ACK (EAK, SEG, NUL dont care) without version */
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#define M_PDU_RST 0xBC /* RST (ACK dont care) without version */
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#define M_VERSION 0x03 /* only Version */
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#define ICCID_PREFIX 0x98
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static int proto_cattp = -1;
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static gint ett_cattp = -1;
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static gint ett_cattp_id = -1;
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static gint ett_cattp_flags = -1;
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static gint ett_cattp_eaks = -1;
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static int hf_cattp_flags = -1;
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/* flag components */
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static int hf_cattp_flag_syn = -1;
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static int hf_cattp_flag_ack = -1;
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static int hf_cattp_flag_eak = -1;
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static int hf_cattp_flag_rst = -1;
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static int hf_cattp_flag_nul = -1;
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static int hf_cattp_flag_seg = -1;
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static int hf_cattp_version = -1;
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/* structure of flag components */
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static const int *cattp_flags[] = {
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&hf_cattp_flag_syn,
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&hf_cattp_flag_ack,
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&hf_cattp_flag_eak,
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&hf_cattp_flag_rst,
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&hf_cattp_flag_nul,
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&hf_cattp_flag_seg,
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&hf_cattp_version,
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NULL
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};
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static int hf_cattp_hlen = -1;
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static int hf_cattp_srcport = -1;
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static int hf_cattp_dstport = -1;
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static int hf_cattp_datalen = -1;
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static int hf_cattp_seq = -1;
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static int hf_cattp_ack = -1;
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static int hf_cattp_windowsize = -1;
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static int hf_cattp_checksum = -1;
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static int hf_cattp_checksum_status = -1;
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static int hf_cattp_identification = -1;
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static int hf_cattp_iccid = -1;
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static int hf_cattp_idlen = -1;
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static int hf_cattp_maxpdu = -1;
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static int hf_cattp_maxsdu = -1;
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static int hf_cattp_rc = -1;
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static int hf_cattp_eaklen = -1;
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static int hf_cattp_eaks = -1;
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static expert_field ei_cattp_checksum = EI_INIT;
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/* Preference to control whether to check the CATTP checksum */
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static gboolean cattp_check_checksum = TRUE;
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/* Reason code mapping */
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static const value_string cattp_reset_reason[] = {
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{ 0, "Normal Ending" },
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{ 1, "Connection set-up failed, illegal parameters" },
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{ 2, "Temporarily unable to set up this connection" },
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{ 3, "Requested Port not available" },
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{ 4, "Unexpected PDU received" },
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{ 5, "Maximum retries exceeded" },
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{ 6, "Version not supported" },
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{ 7, "RFU" },
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{ 0, NULL }
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};
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static const unit_name_string units_pdu = { "PDU", "PDUs" };
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/* Forward declartion due to use of heuristic dissection preference. */
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void proto_reg_handoff_cattp(void);
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void proto_register_cattp(void);
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/* Dissection of SYN PDUs */
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static guint32
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dissect_cattp_synpdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *cattp_tree, guint32 offset)
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{
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proto_item *idi, *id_tree;
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guint8 idlen;
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proto_tree_add_item(cattp_tree, hf_cattp_maxpdu, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(cattp_tree, hf_cattp_maxsdu, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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idlen = tvb_get_guint8(tvb, offset);
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idi = proto_tree_add_uint(cattp_tree, hf_cattp_idlen, tvb, offset, 1, idlen);
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offset += 1;
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col_append_fstr(pinfo->cinfo, COL_INFO, " IdLen=%u ", idlen);
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id_tree = proto_item_add_subtree(idi, ett_cattp_id);
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if (idlen > 0) {
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guint8 first_id_byte;
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first_id_byte = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(id_tree, hf_cattp_identification, tvb, offset, idlen, ENC_NA);
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/* Optional code. Checks whether identification field may be an ICCID.
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* It has to be considered to move this logic to another layer / dissector.
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* However it is common to send ICCID as Identification for OTA download. */
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if (idlen <= 10 && idlen >= 9 && ICCID_PREFIX == first_id_byte) {
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wmem_strbuf_t *buf;
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int i;
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buf = wmem_strbuf_new(wmem_packet_scope(), "");
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/* switch nibbles */
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for (i = 0; i < idlen; i++) {
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guint8 c, n;
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c = tvb_get_guint8(tvb, offset + i);
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n = ((c & 0xF0) >> 4) + ((c & 0x0F) << 4);
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wmem_strbuf_append_printf(buf, "%02X", n);
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}
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proto_tree_add_string(id_tree, hf_cattp_iccid, tvb, offset,
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idlen, wmem_strbuf_get_str(buf));
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}
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offset += idlen;
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}
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return offset;
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}
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/* Dissection of Extended Acknowledgement PDUs */
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static guint32
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dissect_cattp_eakpdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *cattp_tree, guint32 offset, guint8 hlen)
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{
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proto_item *eaki;
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guint8 eak_count;
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eak_count = (hlen - offset) >> 1;
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eaki = proto_tree_add_uint(cattp_tree, hf_cattp_eaklen, tvb, offset, eak_count * 2, eak_count);
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if (eak_count > 0) {
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proto_item *eak_tree;
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int i;
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col_append_fstr(pinfo->cinfo, COL_INFO, " EAKs=%u", eak_count);
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eak_tree = proto_item_add_subtree(eaki, ett_cattp_eaks);
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for (i = 0; i < eak_count; i++) {
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proto_tree_add_item(eak_tree, hf_cattp_eaks, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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}
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}
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return offset;
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}
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/* Dissection of Extended Acknowledgement PDUs */
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static guint32
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dissect_cattp_rstpdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *cattp_tree, guint32 offset)
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{
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guint8 rc;
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const gchar *rc_str;
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rc = tvb_get_guint8(tvb, offset); /* reason code of RST */
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rc_str = val_to_str(rc, cattp_reset_reason, "Unknown reason code: 0x%02x");
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col_append_fstr(pinfo->cinfo, COL_INFO, " Reason=\"%s\" ", rc_str);
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proto_tree_add_item(cattp_tree, hf_cattp_rc, tvb, offset, 1, ENC_BIG_ENDIAN);
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return ++offset;
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}
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/* Dissection of the base header */
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static int
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dissect_cattp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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const char *pdutype = "[Unknown PDU]";
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proto_item *ti, *cattp_tree;
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guint32 offset;
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vec_t cksum_vec[1];
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int header_offset;
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guint cksum_data_len;
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guint8 flags, first_byte, hlen, ver;
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guint16 plen, ackno, seqno, wsize, sport, dport;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, CATTP_SHORTNAME);
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/* Clear out stuff in the info column */
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col_clear(pinfo->cinfo, COL_INFO);
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hlen = tvb_get_guint8(tvb, 3); /* lookahead header len. */
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offset = 0;
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ti = proto_tree_add_protocol_format(tree, proto_cattp, tvb, offset, hlen,
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"Card Application Toolkit Transport Protocol");
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cattp_tree = proto_item_add_subtree(ti, ett_cattp);
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/* render flags tree */
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first_byte = tvb_get_guint8(tvb, offset);
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flags = first_byte & M_FLAGS; /* discard version from first byte for flags */
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ver = first_byte & M_VERSION; /* discard flags for version */
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proto_tree_add_bitmask(cattp_tree, tvb, offset, hf_cattp_flags, ett_cattp_flags, cattp_flags, ENC_BIG_ENDIAN);
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offset += 3; /* skip RFU and header len */
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/* Header length, varies for SYN(identification) and EAKs */
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proto_tree_add_uint(cattp_tree, hf_cattp_hlen, tvb, offset, 1, hlen);
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offset += 1;
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/* Parse cattp source port. */
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sport = tvb_get_ntohs(tvb, offset);
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proto_tree_add_uint(cattp_tree, hf_cattp_srcport, tvb, offset, 2, sport);
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offset += 2;
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/* Parse cattp destination port. */
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dport = tvb_get_ntohs(tvb, offset);
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proto_tree_add_uint(cattp_tree, hf_cattp_dstport, tvb, offset, 2, dport);
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offset += 2;
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proto_item_append_text(ti, " (v%u, Src Port: %u, Dst Port: %u)", ver, sport, dport);
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col_add_fstr(pinfo->cinfo, COL_INFO, "%u > %u ", sport, dport);
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/* Parse length of payload. */
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plen = tvb_get_ntohs(tvb, offset);
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proto_tree_add_uint(cattp_tree, hf_cattp_datalen, tvb, offset, 2, plen);
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offset += 2;
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/* Parse sequence number. */
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seqno = tvb_get_ntohs(tvb, offset);
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proto_tree_add_uint(cattp_tree, hf_cattp_seq, tvb, offset, 2, seqno);
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offset += 2;
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/* Parse acknowledgement number. */
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ackno = tvb_get_ntohs(tvb, offset);
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proto_tree_add_uint(cattp_tree, hf_cattp_ack, tvb, offset, 2, ackno);
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offset += 2;
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/* Parse window size. */
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wsize = tvb_get_ntohs(tvb, offset);
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proto_tree_add_uint(cattp_tree, hf_cattp_windowsize, tvb, offset, 2, wsize);
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offset += 2;
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if (flags & F_SYN)
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pdutype = "[SYN PDU]";
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else if (flags & F_ACK)
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pdutype = "[ACK PDU]";
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else if (flags & F_RST)
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pdutype = "[RST PDU]";
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col_append_fstr(pinfo->cinfo, COL_INFO, "%s Flags=0x%02X Ack=%u Seq=%u WSize=%u", pdutype, flags, ackno, seqno, wsize);
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/* Parse and verify checksum */
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header_offset = 0;
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cksum_data_len = hlen + plen;
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if (!cattp_check_checksum) {
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/* We have turned checksum checking off; we do NOT checksum it. */
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proto_tree_add_checksum(cattp_tree, tvb, offset, hf_cattp_checksum, hf_cattp_checksum_status, &ei_cattp_checksum,
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pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
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} else {
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/* We haven't turned checksum checking off; checksum it. */
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/* Unlike TCP, CATTP does not make use of a pseudo-header for checksum */
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SET_CKSUM_VEC_TVB(cksum_vec[0], tvb, header_offset, cksum_data_len);
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proto_tree_add_checksum(cattp_tree, tvb, offset, hf_cattp_checksum, hf_cattp_checksum_status, &ei_cattp_checksum,
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pinfo, in_cksum(cksum_vec, 1), ENC_BIG_ENDIAN, PROTO_CHECKSUM_VERIFY|PROTO_CHECKSUM_IN_CKSUM);
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} /* End of checksum code */
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offset += 2;
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if (flags & F_SYN)
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offset = dissect_cattp_synpdu(tvb, pinfo, cattp_tree, offset);
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else if (flags & F_EAK)
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offset = dissect_cattp_eakpdu(tvb, pinfo, cattp_tree, offset, hlen);
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else if (flags & F_RST)
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offset = dissect_cattp_rstpdu(tvb, pinfo, cattp_tree, offset);
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/* for other PDU types nothing special to be displayed in detail tree. */
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if (plen > 0) { /* Call generic data handle if data exists. */
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col_append_fstr(pinfo->cinfo, COL_INFO, " DataLen=%u", plen);
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tvb = tvb_new_subset_remaining(tvb, offset);
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call_data_dissector(tvb, pinfo, tree);
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}
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return tvb_captured_length(tvb);
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}
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/* The heuristic dissector function checks if the UDP packet may be a cattp packet */
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static gboolean
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dissect_cattp_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
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{
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if (tvb_captured_length(tvb) >= CATTP_HBLEN) { /* check of data is big enough for base header. */
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guint8 flags, hlen;
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guint16 plen;
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hlen = tvb_get_guint8(tvb, 3); /* header len */
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plen = tvb_get_ntohs(tvb, 8); /* payload len */
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if (hlen+plen != tvb_reported_length(tvb)) /* check if data length is ok. */
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return FALSE;
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flags = tvb_get_guint8(tvb, 0) & M_FLAGS;
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if ( (flags & M_PDU_SYN) == F_SYN ||
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(flags & M_PDU_RST) == F_RST ||
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(flags & M_PDU_ACK) == F_ACK ) { /* check if flag combi is valid */
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dissect_cattp(tvb, pinfo, tree, data);
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return TRUE;
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}
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}
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return FALSE;
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}
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/* Function to register the dissector, called by infrastructure. */
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void
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proto_register_cattp(void)
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{
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static hf_register_info hf[] = {
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{
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&hf_cattp_flags,
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{
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"Flags", "cattp.flags", FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_cattp_flag_syn,
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{
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"Synchronize Flag", "cattp.flags.syn", FT_UINT8, BASE_DEC, NULL, F_SYN,
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NULL, HFILL
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}
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},
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{
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&hf_cattp_flag_ack,
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{
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"Acknowledge Flag", "cattp.flags.ack", FT_UINT8, BASE_DEC, NULL, F_ACK,
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NULL, HFILL
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}
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},
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{
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&hf_cattp_flag_eak,
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{
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"Extended Acknowledge Flag", "cattp.flags.eak", FT_UINT8, BASE_DEC, NULL, F_EAK,
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NULL, HFILL
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}
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},
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{
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&hf_cattp_flag_rst,
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{
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"Reset Flag", "cattp.flags.rst", FT_UINT8, BASE_DEC, NULL, F_RST,
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NULL, HFILL
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}
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},
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{
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&hf_cattp_flag_nul,
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{
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"NULL Flag", "cattp.flags.nul", FT_UINT8, BASE_DEC, NULL, F_NUL,
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NULL, HFILL
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}
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},
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{
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&hf_cattp_flag_seg,
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{
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"Segmentation Flag", "cattp.flags.seg", FT_UINT8, BASE_DEC, NULL, F_SEG,
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NULL, HFILL
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}
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},
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{
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&hf_cattp_version,
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{
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"Version", "cattp.version", FT_UINT8, BASE_HEX, NULL, M_VERSION,
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NULL, HFILL
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}
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},
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{
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&hf_cattp_hlen,
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{
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"Header Length", "cattp.hlen", FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_cattp_srcport,
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{
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"Source Port", "cattp.srcport", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_cattp_dstport,
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{
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"Destination Port", "cattp.dstport", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_cattp_datalen,
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{
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"Data Length", "cattp.datalen", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_cattp_seq,
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{
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"Sequence Number", "cattp.seq", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_cattp_ack,
|
|
{
|
|
"Acknowledgement Number", "cattp.ack", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_cattp_windowsize,
|
|
{
|
|
"Window Size", "cattp.windowsize", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_cattp_checksum,
|
|
{
|
|
"Checksum", "cattp.checksum", FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_cattp_checksum_status,
|
|
{
|
|
"Checksum Status", "cattp.checksum.status", FT_UINT8, BASE_NONE, VALS(proto_checksum_vals), 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_cattp_identification,
|
|
{
|
|
"Identification", "cattp.identification", FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_cattp_iccid,
|
|
{
|
|
"ICCID", "cattp.iccid", FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_cattp_maxpdu,
|
|
{
|
|
"Maxpdu", "cattp.maxpdu", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_cattp_maxsdu,
|
|
{
|
|
"Maxsdu", "cattp.maxsdu", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_cattp_rc,
|
|
{
|
|
"Reason Code", "cattp.rc", FT_UINT8, BASE_DEC, VALS(cattp_reset_reason), 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_cattp_idlen,
|
|
{
|
|
"Identification Length", "cattp.idlen", FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_cattp_eaks,
|
|
{
|
|
"Acknowledgement Number", "cattp.eak", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_cattp_eaklen,
|
|
{
|
|
"Extended Acknowledgement Numbers", "cattp.eaks", FT_UINT16, BASE_DEC|BASE_UNIT_STRING, &units_pdu, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
}
|
|
};
|
|
|
|
/* Setup protocol subtree array */
|
|
static gint *ett[] = {
|
|
&ett_cattp,
|
|
&ett_cattp_flags,
|
|
&ett_cattp_id,
|
|
&ett_cattp_eaks
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_cattp_checksum, { "cattp.bad_checksum", PI_CHECKSUM, PI_ERROR, "Bad checksum", EXPFILL }},
|
|
};
|
|
|
|
module_t *cattp_module;
|
|
expert_module_t* expert_cattp;
|
|
|
|
proto_cattp = proto_register_protocol (
|
|
"ETSI Card Application Toolkit Transport Protocol", /* name */
|
|
CATTP_SHORTNAME, /* short name */
|
|
"cattp" /* abbrev */
|
|
);
|
|
|
|
proto_register_field_array(proto_cattp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_cattp = expert_register_protocol(proto_cattp);
|
|
expert_register_field_array(expert_cattp, ei, array_length(ei));
|
|
|
|
cattp_module = prefs_register_protocol(proto_cattp, NULL);
|
|
prefs_register_bool_preference(cattp_module, "checksum",
|
|
"Validate checksum of all messages",
|
|
"Whether the checksum of all messages should be validated or not",
|
|
&cattp_check_checksum);
|
|
|
|
prefs_register_obsolete_preference(cattp_module, "enable");
|
|
}
|
|
|
|
/* Handoff */
|
|
void
|
|
proto_reg_handoff_cattp(void)
|
|
{
|
|
dissector_handle_t cattp_handle;
|
|
|
|
/* Create dissector handle */
|
|
cattp_handle = create_dissector_handle(dissect_cattp, proto_cattp);
|
|
|
|
heur_dissector_add("udp", dissect_cattp_heur, "CAT-TP over UDP", "cattp_udp", proto_cattp, HEURISTIC_ENABLE);
|
|
dissector_add_for_decode_as_with_preference("udp.port", cattp_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:
|
|
*/
|