diff options
Diffstat (limited to 'epan/dissectors/asn1/t38/t38.cnf')
| -rw-r--r-- | epan/dissectors/asn1/t38/t38.cnf | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/epan/dissectors/asn1/t38/t38.cnf b/epan/dissectors/asn1/t38/t38.cnf new file mode 100644 index 0000000000..db61672b71 --- /dev/null +++ b/epan/dissectors/asn1/t38/t38.cnf @@ -0,0 +1,261 @@ +# t38.cnf +# T.38 conformation file +# 2007 Tomas Kukosa + +#.EXPORTS ONLY_VALS WS_DLL +Type-of-msg/t30-indicator +Type-of-msg/t30-data +#.END + +#.TYPE_RENAME +Type-of-msg/t30-indicator T30_indicator +Type-of-msg/t30-data T30_data +#.END + +#.PDU +IFPPacket +UDPTLPacket +#.END + +#.FN_PARS Type-of-msg VAL_PTR=&Type_of_msg_value +#.FN_FTR Type-of-msg + /* info for tap */ + if (primary_part) + t38_info->type_msg = Type_of_msg_value; +#.END + +#.FN_PARS Type-of-msg/t30-indicator VAL_PTR=&T30ind_value +#.FN_FTR Type-of-msg/t30-indicator + if (primary_part){ + col_append_fstr(actx->pinfo->cinfo, COL_INFO, " t30ind: %s", + val_to_str(T30ind_value,t38_T30_indicator_vals,"<unknown>")); + } + + /* info for tap */ + if (primary_part) + t38_info->t30ind_value = T30ind_value; +#.END + +#.FN_PARS Type-of-msg/t30-data VAL_PTR=&Data_value +#.FN_FTR Type-of-msg/t30-data + if (primary_part){ + col_append_fstr(actx->pinfo->cinfo, COL_INFO, " data:%s:", + val_to_str(Data_value,t38_T30_data_vals,"<unknown>")); + } + + + /* info for tap */ + if (primary_part) + t38_info->data_value = Data_value; +#.END + +#.FN_FTR Data-Field/_item + if (primary_part) Data_Field_item_num++; +#.END + +#.FN_PARS Data-Field/_item/field-type +EXT=(use_pre_corrigendum_asn1_specification)?FALSE:TRUE +EXT_NUM=(use_pre_corrigendum_asn1_specification)?0:4 +VAL_PTR=&Data_Field_field_type_value +#.FN_FTR Data-Field/_item/field-type + if (primary_part){ + col_append_fstr(actx->pinfo->cinfo, COL_INFO, " %s", + val_to_str(Data_Field_field_type_value,t38_T_field_type_vals,"<unknown>")); + } + + /* We only reassmeble packets in the Primary part and in the first two Items. */ + /* There maybe be t38 packets with more than two Items, but reassemble those packets is not easy */ + /* using the current ressaemble functions. */ + /* TODO: reassemble all the Items in one frame */ + if (primary_part && (Data_Field_item_num<2)) { + if (Data_Field_field_type_value == 2 || Data_Field_field_type_value == 4 || Data_Field_field_type_value == 7) {/* hdlc-fcs-OK or hdlc-fcs-OK-sig-end or t4-non-ecm-sig-end*/ + fragment_head *frag_msg = NULL; + tvbuff_t* new_tvb = NULL; + gboolean save_fragmented = actx->pinfo->fragmented; + + actx->pinfo->fragmented = TRUE; + + /* if reass_start_seqnum=-1 it means we have received the end of the fragmente, without received any fragment data */ + if (p_t38_packet_conv_info->reass_start_seqnum != -1) { + frag_msg = fragment_add_seq(&data_reassembly_table, /* reassembly table */ + tvb, offset, actx->pinfo, + p_t38_packet_conv_info->reass_ID, /* ID for fragments belonging together */ + NULL, + seq_number + Data_Field_item_num - (guint32)p_t38_packet_conv_info->reass_start_seqnum + (guint32)p_t38_packet_conv_info->additional_hdlc_data_field_counter, /* fragment sequence number */ + /*0,*/ + 0, /* fragment length */ + FALSE, /* More fragments */ + 0); + if ( Data_Field_field_type_value == 7 ) { + /* if there was packet lost or other errors during the defrag then frag_msg is NULL. This could also means + * there are out of order packets (e.g, got the tail frame t4-non-ecm-sig-end before the last fragment), + * but we will assume there was packet lost instead, which is more usual. So, we are going to reassemble the packet + * and get some stat, like packet lost and burst number of packet lost + */ + if (!frag_msg) { + force_reassemble_seq(&data_reassembly_table, /* reassembly table */ + actx->pinfo, + p_t38_packet_conv_info->reass_ID /* ID for fragments belonging together */ + ); + } else { + col_append_str(actx->pinfo->cinfo, COL_INFO, " (t4-data Reassembled: No packet lost)"); + + g_snprintf(t38_info->desc_comment, MAX_T38_DESC, "No packet lost"); + } + + + if (p_t38_packet_conv_info->packet_lost) { + g_snprintf(t38_info->desc_comment, MAX_T38_DESC, " Pack lost: %d, Pack burst lost: %d", p_t38_packet_conv_info->packet_lost, p_t38_packet_conv_info->burst_lost); + } else { + g_snprintf(t38_info->desc_comment, MAX_T38_DESC, "No packet lost"); + } + + process_reassembled_data(tvb, offset, actx->pinfo, + "Reassembled T38", frag_msg, &data_frag_items, NULL, tree); + + /* Now reset fragmentation information in pinfo */ + actx->pinfo->fragmented = save_fragmented; + + t38_info->time_first_t4_data = p_t38_packet_conv_info->time_first_t4_data; + t38_info->frame_num_first_t4_data = p_t38_packet_conv_info->reass_ID; /* The reass_ID is the Frame number of the first t4 fragment */ + + } else { + new_tvb = process_reassembled_data(tvb, offset, actx->pinfo, + "Reassembled T38", frag_msg, &data_frag_items, NULL, tree); + + /* Now reset fragmentation information in pinfo */ + actx->pinfo->fragmented = save_fragmented; + + if (new_tvb) call_dissector_with_data((t30_hdlc_handle) ? t30_hdlc_handle : data_handle, new_tvb, actx->pinfo, tree, t38_info); + } + } else { + proto_tree_add_expert_format(tree, actx->pinfo, &ei_t38_malformed, tvb, offset, tvb_reported_length_remaining(tvb, offset), + "[RECEIVED END OF FRAGMENT W/OUT ANY FRAGMENT DATA]"); + col_append_str(actx->pinfo->cinfo, COL_INFO, " [Malformed?]"); + actx->pinfo->fragmented = save_fragmented; + } + } + + /* reset the reassemble ID and the start seq number if it is not HDLC data */ + if ( p_t38_conv && ( ((Data_Field_field_type_value >0) && (Data_Field_field_type_value <6)) || (Data_Field_field_type_value == 7) ) ){ + p_t38_conv_info->reass_ID = 0; + p_t38_conv_info->reass_start_seqnum = -1; + p_t38_conv_info->additional_hdlc_data_field_counter = 0; + p_t38_conv_info->seqnum_prev_data_field = -1; + } + t38_info->Data_Field_field_type_value = Data_Field_field_type_value; + } +#.END + +#.FN_BODY Data-Field/_item/field-data VAL_PTR=&value_tvb + tvbuff_t *value_tvb = NULL; + guint32 value_len; + +%(DEFAULT_BODY)s + value_len = tvb_reported_length(value_tvb); + +#.FN_FTR Data-Field/_item/field-data + if (primary_part){ + if(value_len < 8){ + col_append_fstr(actx->pinfo->cinfo, COL_INFO, "[%s]", + tvb_bytes_to_str(wmem_packet_scope(), value_tvb,0,value_len)); + } + else { + col_append_fstr(actx->pinfo->cinfo, COL_INFO, "[%s...]", + tvb_bytes_to_str(wmem_packet_scope(), value_tvb,0,7)); + } + } + + /* We only reassmeble packets in the Primary part and in the first two Items. */ + /* There maybe be t38 packets with more than two Items, but reassemble those packets is not easy */ + /* using the current ressaemble functions. */ + /* TODO: reassemble all the Items in one frame */ + if (primary_part && (Data_Field_item_num<2)) { + fragment_head *frag_msg = NULL; + + /* HDLC Data or t4-non-ecm-data */ + if (Data_Field_field_type_value == 0 || Data_Field_field_type_value == 6) { /* 0=HDLC Data or 6=t4-non-ecm-data*/ + gboolean save_fragmented = actx->pinfo->fragmented; + + actx->pinfo->fragmented = TRUE; + + /* if we have not reassembled this packet and it is the first fragment, reset the reassemble ID and the start seq number*/ + if (p_t38_packet_conv && p_t38_conv && (p_t38_packet_conv_info->reass_ID == 0)) { + /* we use the first fragment's frame_number as fragment ID because the protocol doesn't provide it */ + p_t38_conv_info->reass_ID = actx->pinfo->num; + p_t38_conv_info->reass_start_seqnum = seq_number; + p_t38_conv_info->time_first_t4_data = nstime_to_sec(&actx->pinfo->rel_ts); + p_t38_conv_info->additional_hdlc_data_field_counter = 0; + p_t38_packet_conv_info->reass_ID = p_t38_conv_info->reass_ID; + p_t38_packet_conv_info->reass_start_seqnum = p_t38_conv_info->reass_start_seqnum; + p_t38_packet_conv_info->seqnum_prev_data_field = p_t38_conv_info->seqnum_prev_data_field; + p_t38_packet_conv_info->additional_hdlc_data_field_counter = p_t38_conv_info->additional_hdlc_data_field_counter; + p_t38_packet_conv_info->time_first_t4_data = p_t38_conv_info->time_first_t4_data; + } + if (seq_number == (guint32)p_t38_packet_conv_info->seqnum_prev_data_field){ + p_t38_packet_conv_info->additional_hdlc_data_field_counter ++; + if(p_t38_conv){ + p_t38_conv_info->additional_hdlc_data_field_counter = p_t38_packet_conv_info->additional_hdlc_data_field_counter; + } + } + frag_msg = fragment_add_seq(&data_reassembly_table, + value_tvb, 0, + actx->pinfo, + p_t38_packet_conv_info->reass_ID, /* ID for fragments belonging together */ + NULL, + seq_number - (guint32)p_t38_packet_conv_info->reass_start_seqnum + (guint32)p_t38_packet_conv_info->additional_hdlc_data_field_counter, /* fragment sequence number */ + value_len, /* fragment length */ + TRUE, /* More fragments */ + 0); + p_t38_packet_conv_info->seqnum_prev_data_field = (gint32)seq_number; + process_reassembled_data(tvb, offset, actx->pinfo, + "Reassembled T38", frag_msg, &data_frag_items, NULL, tree); + + if (!frag_msg) { /* Not last packet of reassembled */ + if (Data_Field_field_type_value == 0) { + col_append_fstr(actx->pinfo->cinfo, COL_INFO," (HDLC fragment %u)", + seq_number + (guint32)p_t38_packet_conv_info->additional_hdlc_data_field_counter + - (guint32)p_t38_packet_conv_info->reass_start_seqnum); + } else { + col_append_fstr(actx->pinfo->cinfo, COL_INFO," (t4-data fragment %u)", seq_number - (guint32)p_t38_packet_conv_info->reass_start_seqnum); + } + } + + /* Now reset fragmentation information in pinfo */ + actx->pinfo->fragmented = save_fragmented; + } + } +#.END + + +#.FN_HDR UDPTLPacket + /* Initialize to something else than data type */ + Data_Field_field_type_value = 1; +#.END + +#.FN_PARS UDPTLPacket/seq-number VAL_PTR=&seq_number +#.FN_FTR UDPTLPacket/seq-number + /* info for tap */ + if (primary_part) + t38_info->seq_num = seq_number; + + col_append_fstr(actx->pinfo->cinfo, COL_INFO, "Seq=%05u ",seq_number); +#.END + +#.FN_HDR UDPTLPacket/primary-ifp-packet + primary_part = TRUE; +#.FN_FTR UDPTLPacket/primary-ifp-packet + /* if is a valid t38 packet, add to tap */ + /* Note that t4-non-ecm-sig-end without first_t4_data is not valid */ + if (p_t38_packet_conv && (!actx->pinfo->flags.in_error_pkt) && ((gint32) seq_number != p_t38_packet_conv_info->last_seqnum) && + !(t38_info->type_msg == 1 && t38_info->Data_Field_field_type_value == 7 && t38_info->frame_num_first_t4_data == 0)) + tap_queue_packet(t38_tap, actx->pinfo, t38_info); + + if (p_t38_conv) p_t38_conv_info->last_seqnum = (gint32) seq_number; +#.END + +#.FN_HDR UDPTLPacket/error-recovery + primary_part = FALSE; +#.FN_FTR UDPTLPacket/error-recovery + primary_part = TRUE; +#.END |