diff options
Diffstat (limited to 'epan/dissectors/asn1/mms/packet-mms-template.c')
| -rw-r--r-- | epan/dissectors/asn1/mms/packet-mms-template.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/epan/dissectors/asn1/mms/packet-mms-template.c b/epan/dissectors/asn1/mms/packet-mms-template.c new file mode 100644 index 0000000000..2d0341b169 --- /dev/null +++ b/epan/dissectors/asn1/mms/packet-mms-template.c @@ -0,0 +1,179 @@ +/* packet-mms_asn1.c + * + * Ronnie Sahlberg 2005 + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" + +#include <epan/packet.h> +#include <epan/prefs.h> +#include <epan/asn1.h> +#include <epan/expert.h> + +#include "packet-ber.h" +#include "packet-acse.h" +#include "packet-mms.h" + +#define PNAME "MMS" +#define PSNAME "MMS" +#define PFNAME "mms" + +void proto_register_mms(void); +void proto_reg_handoff_mms(void); + +/* Initialize the protocol and registered fields */ +static int proto_mms = -1; + +#include "packet-mms-hf.c" + +/* Initialize the subtree pointers */ +static gint ett_mms = -1; +#include "packet-mms-ett.c" + +static expert_field ei_mms_mal_timeofday_encoding = EI_INIT; +static expert_field ei_mms_mal_utctime_encoding = EI_INIT; +static expert_field ei_mms_zero_pdu = EI_INIT; + +#include "packet-mms-fn.c" + +/* +* Dissect MMS PDUs inside a PPDU. +*/ +static int +dissect_mms(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data _U_) +{ + int offset = 0; + int old_offset; + proto_item *item=NULL; + proto_tree *tree=NULL; + asn1_ctx_t asn1_ctx; + asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo); + + if(parent_tree){ + item = proto_tree_add_item(parent_tree, proto_mms, tvb, 0, -1, ENC_NA); + tree = proto_item_add_subtree(item, ett_mms); + } + col_set_str(pinfo->cinfo, COL_PROTOCOL, "MMS"); + col_clear(pinfo->cinfo, COL_INFO); + + while (tvb_reported_length_remaining(tvb, offset) > 0){ + old_offset=offset; + offset=dissect_mms_MMSpdu(FALSE, tvb, offset, &asn1_ctx , tree, -1); + if(offset == old_offset){ + proto_tree_add_expert(tree, pinfo, &ei_mms_zero_pdu, tvb, offset, -1); + break; + } + } + return tvb_captured_length(tvb); +} + + +/*--- proto_register_mms -------------------------------------------*/ +void proto_register_mms(void) { + + /* List of fields */ + static hf_register_info hf[] = + { +#include "packet-mms-hfarr.c" + }; + + /* List of subtrees */ + static gint *ett[] = { + &ett_mms, +#include "packet-mms-ettarr.c" + }; + + static ei_register_info ei[] = { + { &ei_mms_mal_timeofday_encoding, { "mms.malformed.timeofday_encoding", PI_MALFORMED, PI_WARN, "BER Error: malformed TimeOfDay encoding", EXPFILL }}, + { &ei_mms_mal_utctime_encoding, { "mms.malformed.utctime", PI_MALFORMED, PI_WARN, "BER Error: malformed IEC61850 UTCTime encoding", EXPFILL }}, + { &ei_mms_zero_pdu, { "mms.zero_pdu", PI_PROTOCOL, PI_ERROR, "Internal error, zero-byte MMS PDU", EXPFILL }}, + }; + + expert_module_t* expert_mms; + + /* Register protocol */ + proto_mms = proto_register_protocol(PNAME, PSNAME, PFNAME); + register_dissector("mms", dissect_mms, proto_mms); + /* Register fields and subtrees */ + proto_register_field_array(proto_mms, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + expert_mms = expert_register_protocol(proto_mms); + expert_register_field_array(expert_mms, ei, array_length(ei)); + +} + + +static gboolean +dissect_mms_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void *data _U_) +{ + /* must check that this really is an mms packet */ + int offset = 0; + guint32 length = 0 ; + guint32 oct; + gint idx = 0 ; + + gint8 tmp_class; + gboolean tmp_pc; + gint32 tmp_tag; + + /* first, check do we have at least 2 bytes (pdu) */ + if (!tvb_bytes_exist(tvb, 0, 2)) + return FALSE; /* no */ + + /* can we recognize MMS PDU ? Return FALSE if not */ + /* get MMS PDU type */ + offset = get_ber_identifier(tvb, offset, &tmp_class, &tmp_pc, &tmp_tag); + + /* check MMS type */ + + /* Class should be constructed */ + if (tmp_class!=BER_CLASS_CON) + return FALSE; + + /* see if the tag is a valid MMS PDU */ + try_val_to_str_idx(tmp_tag, mms_MMSpdu_vals, &idx); + if (idx == -1) { + return FALSE; /* no, it isn't an MMS PDU */ + } + + /* check MMS length */ + oct = tvb_get_guint8(tvb, offset)& 0x7F; + if (oct==0) + /* MMS requires length after tag so not MMS if indefinite length*/ + return FALSE; + + offset = get_ber_length(tvb, offset, &length, NULL); + /* do we have enough bytes? */ + if (!tvb_bytes_exist(tvb, offset, length)) + return FALSE; + + dissect_mms(tvb, pinfo, parent_tree, data); + return TRUE; +} + +/*--- proto_reg_handoff_mms --- */ +void proto_reg_handoff_mms(void) { + register_ber_oid_dissector("1.0.9506.2.3", dissect_mms, proto_mms,"MMS"); + register_ber_oid_dissector("1.0.9506.2.1", dissect_mms, proto_mms,"mms-abstract-syntax-version1(1)"); + heur_dissector_add("cotp", dissect_mms_heur, "MMS over COTP", "mms_cotp", proto_mms, HEURISTIC_ENABLE); + heur_dissector_add("cotp_is", dissect_mms_heur, "MMS over COTP (inactive subset)", "mms_cotp_is", proto_mms, HEURISTIC_ENABLE); +} + |