/*XXX There is a bug in asn2wrs that it can not yet handle tagged assignments such as EXTERNAL ::= [UNIVERSAL 8] IMPLICIT SEQUENCE { This bug is workedaround by some .cnf magic but this should be cleaned up once asn2wrs learns how to deal with tagged assignments */ /* packet-acse.c * Routines for ACSE packet dissection * Ronnie Sahlberg 2005 * dissect_acse() based original handwritten dissector by Sid * Yuriy Sidelnikov * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * SPDX-License-Identifier: GPL-2.0-or-later */ #include "config.h" #include #include #include #include #include #include "packet-ber.h" #include "packet-acse.h" #include "packet-ses.h" #include "packet-pres.h" #include "packet-x509if.h" #define PNAME "ISO 8650-1 OSI Association Control Service" #define PSNAME "ACSE" #define PFNAME "acse" #define CLPNAME "ISO 10035-1 OSI Connectionless Association Control Service" #define CLPSNAME "CLACSE" #define CLPFNAME "clacse" #define ACSE_APDU_OID "2.2.1.0.1" void proto_register_acse(void); void proto_reg_handoff_acse(void); /* Initialize the protocol and registered fields */ int proto_acse = -1; int proto_clacse = -1; #include "packet-acse-hf.c" static gint hf_acse_user_data; /* Initialize the subtree pointers */ static gint ett_acse; #include "packet-acse-ett.c" static expert_field ei_acse_dissector_not_available; static expert_field ei_acse_malformed; static expert_field ei_acse_invalid_oid; static dissector_handle_t acse_handle = NULL; /* indirect_reference, used to pick up the signalling so we know what kind of data is transferred in SES_DATA_TRANSFER_PDUs */ static guint32 indir_ref=0; #if NOT_NEEDED /* to keep track of presentation context identifiers and protocol-oids */ typedef struct _acse_ctx_oid_t { /* XXX here we should keep track of ADDRESS/PORT as well */ guint32 ctx_id; char *oid; } acse_ctx_oid_t; static wmem_map_t *acse_ctx_oid_table = NULL; static guint acse_ctx_oid_hash(gconstpointer k) { acse_ctx_oid_t *aco=(acse_ctx_oid_t *)k; return aco->ctx_id; } /* XXX this one should be made ADDRESS/PORT aware */ static gint acse_ctx_oid_equal(gconstpointer k1, gconstpointer k2) { acse_ctx_oid_t *aco1=(acse_ctx_oid_t *)k1; acse_ctx_oid_t *aco2=(acse_ctx_oid_t *)k2; return aco1->ctx_id==aco2->ctx_id; } static void register_ctx_id_and_oid(packet_info *pinfo _U_, guint32 idx, char *oid) { acse_ctx_oid_t *aco, *tmpaco; aco=wmem_new(wmem_file_scope(), acse_ctx_oid_t); aco->ctx_id=idx; aco->oid=wmem_strdup(wmem_file_scope(), oid); /* if this ctx already exists, remove the old one first */ tmpaco=(acse_ctx_oid_t *)wmem_map_lookup(acse_ctx_oid_table, aco); if (tmpaco) { wmem_map_remove(acse_ctx_oid_table, tmpaco); } wmem_map_insert(acse_ctx_oid_table, aco, aco); } static char * find_oid_by_ctx_id(packet_info *pinfo _U_, guint32 idx) { acse_ctx_oid_t aco, *tmpaco; aco.ctx_id=idx; tmpaco=(acse_ctx_oid_t *)wmem_map_lookup(acse_ctx_oid_table, &aco); if (tmpaco) { return tmpaco->oid; } return NULL; } # endif /* NOT_NEEDED */ #include "packet-acse-fn.c" /* * Dissect ACSE PDUs inside a PPDU. */ static int dissect_acse(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data) { int offset = 0; proto_item *item; proto_tree *tree; char *oid; struct SESSION_DATA_STRUCTURE* session; asn1_ctx_t asn1_ctx; asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo); /* do we have spdu type from the session dissector? */ if (data == NULL) { return 0; } /* first, try to check length */ /* do we have at least 2 bytes */ if (!tvb_bytes_exist(tvb, 0, 2)) { proto_tree_add_item(parent_tree, hf_acse_user_data, tvb, offset, tvb_reported_length_remaining(tvb,offset), ENC_NA); return 0; /* no, it isn't a ACSE PDU */ } session = ( (struct SESSION_DATA_STRUCTURE*)data); if (session->spdu_type == 0) { if (parent_tree) { REPORT_DISSECTOR_BUG("Wrong spdu type %x from session dissector.",session->spdu_type); return 0; } } asn1_ctx.private_data = session; /* save parent_tree so subdissectors can create new top nodes */ asn1_ctx.subtree.top_tree = parent_tree; /* ACSE has only AARQ,AARE,RLRQ,RLRE,ABRT type of pdu */ /* reject everything else */ /* data pdu is not ACSE pdu and has to go directly to app dissector */ switch (session->spdu_type) { case SES_CONNECTION_REQUEST: /* AARQ */ case SES_CONNECTION_ACCEPT: /* AARE */ case SES_REFUSE: /* RLRE */ case SES_DISCONNECT: /* RLRQ */ case SES_FINISH: /* RLRE */ case SES_ABORT: /* ABRT */ case CLSES_UNIT_DATA: /* AARQ Connectionless session */ break; case SES_DATA_TRANSFER: oid=find_oid_by_pres_ctx_id(pinfo, indir_ref); if (oid) { if (strcmp(oid, ACSE_APDU_OID) == 0) { proto_tree_add_expert_format(parent_tree, pinfo, &ei_acse_invalid_oid, tvb, offset, -1, "Invalid OID: %s", ACSE_APDU_OID); } else { call_ber_oid_callback(oid, tvb, offset, pinfo, parent_tree, NULL); } } else { proto_tree_add_expert(parent_tree, pinfo, &ei_acse_dissector_not_available, tvb, offset, -1); } return 0; default: return 0; } if (session->spdu_type == CLSES_UNIT_DATA) { /* create display subtree for the connectionless protocol */ item = proto_tree_add_item(parent_tree, proto_clacse, tvb, 0, -1, ENC_NA); tree = proto_item_add_subtree(item, ett_acse); col_set_str(pinfo->cinfo, COL_PROTOCOL, "CL-ACSE"); col_clear(pinfo->cinfo, COL_INFO); } else { /* create display subtree for the protocol */ item = proto_tree_add_item(parent_tree, proto_acse, tvb, 0, -1, ENC_NA); tree = proto_item_add_subtree(item, ett_acse); col_set_str(pinfo->cinfo, COL_PROTOCOL, "ACSE"); col_clear(pinfo->cinfo, COL_INFO); } /* we can't make any additional checking here */ /* postpone it before dissector will have more information */ while (tvb_reported_length_remaining(tvb, offset) > 0) { int old_offset=offset; offset = dissect_acse_ACSE_apdu(FALSE, tvb, offset, &asn1_ctx, tree, -1); if (offset == old_offset) { proto_tree_add_expert(tree, pinfo, &ei_acse_malformed, tvb, offset, -1); break; } } return tvb_captured_length(tvb); } /*--- proto_register_acse ----------------------------------------------*/ void proto_register_acse(void) { /* List of fields */ static hf_register_info hf[] = { { &hf_acse_user_data, { "User data", "acse.user_data", FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL }}, #include "packet-acse-hfarr.c" }; /* List of subtrees */ static gint *ett[] = { &ett_acse, #include "packet-acse-ettarr.c" }; static ei_register_info ei[] = { { &ei_acse_dissector_not_available, { "acse.dissector_not_available", PI_UNDECODED, PI_WARN, "Dissector is not available", EXPFILL }}, { &ei_acse_malformed, { "acse.malformed", PI_MALFORMED, PI_ERROR, "Malformed packet", EXPFILL }}, { &ei_acse_invalid_oid, { "acse.invalid_oid", PI_UNDECODED, PI_WARN, "Invalid OID", EXPFILL }}, }; expert_module_t* expert_acse; /* Register protocol */ proto_acse = proto_register_protocol(PNAME, PSNAME, PFNAME); acse_handle = register_dissector("acse", dissect_acse, proto_acse); /* Register connectionless protocol */ proto_clacse = proto_register_protocol(CLPNAME, CLPSNAME, CLPFNAME); /* Register fields and subtrees */ proto_register_field_array(proto_acse, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); expert_acse = expert_register_protocol(proto_acse); expert_register_field_array(expert_acse, ei, array_length(ei)); #if NOT_NEEDED acse_ctx_oid_table = wmem_map_new_autoreset(wmem_epan_scope(), wmem_file_scope(), acse_ctx_oid_hash, acse_ctx_oid_equal); #endif } /*--- proto_reg_handoff_acse -------------------------------------------*/ void proto_reg_handoff_acse(void) { /*#include "packet-acse-dis-tab.c"*/ oid_add_from_string("id-aCSE","2.2.3.1.1"); register_ber_oid_dissector_handle(ACSE_APDU_OID, acse_handle, proto_acse, "id-as-acse"); }