tvbuff_t *cbs_page_tvb = NULL; tvbuff_t *cbs_msg_tvb = NULL; fragment_head * frag_data = NULL; len = tvb_reported_length(tvb); col_append_str(pinfo->cinfo, COL_PROTOCOL, " Cell Broadcast"); col_append_str(pinfo->cinfo, COL_INFO, " (CBS Page)"); cbs_page_item = proto_tree_add_protocol_format(proto_tree_get_root(tree), proto_cell_broadcast, tvb, 0, len, "GSM Cell Broadcast"); cbs_page_tree = proto_item_add_subtree(cbs_page_item, ett_gsm_cbs_page); serial_number = tvb_get_ntohs(tvb, offset); offset = dissect_cbs_serial_number(tvb, cbs_page_tree, offset); message_id = tvb_get_ntohs(tvb, offset); offset = dissect_cbs_message_identifier(tvb, cbs_page_tree, offset); sms_encoding = dissect_cbs_data_coding_scheme(tvb, pinfo, cbs_page_tree, offset++); total_pages = tvb_get_guint8(tvb, offset); current_page = (total_pages & 0xF0) >> 4; total_pages &= 0x0F; proto_tree_add_item(cbs_page_tree, hf_gsm_cbs_current_page, tvb, offset, 1, ENC_BIG_ENDIAN); proto_tree_add_item(cbs_page_tree, hf_gsm_cbs_total_pages, tvb, offset++, 1, ENC_BIG_ENDIAN); cbs_page_tvb = dissect_cbs_data(sms_encoding, tvb, cbs_page_tree, pinfo, offset ); if (cbs_page_tvb != NULL) { text_len = tvb_reported_length(cbs_page_tvb); while (text_len && (tvb_get_guint8(cbs_page_tvb, text_len-1) == '\r')) { text_len--; } if (tree != NULL)
static void dissect_gsm_cell_broadcast(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { guint8 sms_encoding, total_pages, current_page; guint32 offset = 0; guint len, text_len; guint32 msg_key; proto_item *cbs_page_item = NULL; proto_tree *cbs_page_tree = NULL; guint16 serial_number, message_id; tvbuff_t *cbs_page_tvb = NULL; tvbuff_t *cbs_msg_tvb = NULL; fragment_head * frag_data = NULL; len = tvb_length(tvb); col_append_str(pinfo->cinfo, COL_PROTOCOL, " Cell Broadcast"); col_append_str(pinfo->cinfo, COL_INFO, " (CBS Page)"); cbs_page_item = proto_tree_add_protocol_format(proto_tree_get_root(tree), proto_cell_broadcast, tvb, 0, len, "GSM Cell Broadcast"); cbs_page_tree = proto_item_add_subtree(cbs_page_item, ett_gsm_cbs_page); serial_number = tvb_get_ntohs(tvb, offset); offset = dissect_cbs_serial_number(tvb, cbs_page_tree, offset); message_id = tvb_get_ntohs(tvb, offset); offset = dissect_cbs_message_identifier(tvb, cbs_page_tree, offset); sms_encoding = dissect_cbs_data_coding_scheme(tvb, pinfo, cbs_page_tree, offset++); total_pages = tvb_get_guint8(tvb, offset); current_page = (total_pages & 0xF0) >> 4; total_pages &= 0x0F; proto_tree_add_item(cbs_page_tree, hf_gsm_cbs_current_page, tvb, offset, 1, ENC_BIG_ENDIAN); proto_tree_add_item(cbs_page_tree, hf_gsm_cbs_total_pages, tvb, offset++, 1, ENC_BIG_ENDIAN); cbs_page_tvb = dissect_cbs_data(sms_encoding, tvb, cbs_page_tree, pinfo, offset ); if (cbs_page_tvb != NULL) { text_len = tvb_length(cbs_page_tvb); while (text_len && (tvb_get_guint8(cbs_page_tvb, text_len-1) == '\r')) { text_len--; } if (tree != NULL) { proto_tree *cbs_page_subtree = proto_tree_add_subtree(cbs_page_tree, tvb, offset, -1, ett_gsm_cbs_page_content, NULL, "Cell Broadcast Page Contents"); len = tvb_length(cbs_page_tvb); proto_tree_add_string(cbs_page_subtree, hf_gsm_cbs_page_content, cbs_page_tvb, 0, text_len, tvb_get_string_enc(wmem_packet_scope(), cbs_page_tvb, 0, text_len, ENC_ASCII)); len -= text_len; if (len) { proto_tree_add_string(cbs_page_subtree, hf_gsm_cbs_page_content_padding, cbs_page_tvb, text_len, len, tvb_get_string_enc(wmem_packet_scope(), cbs_page_tvb, text_len, len, ENC_ASCII)); } } if (text_len) { cbs_page_tvb = tvb_new_subset_length(cbs_page_tvb, 0, text_len); if (total_pages == 1) { /* no need for reassembly */ cbs_msg_tvb = cbs_page_tvb; } else { /* now we have a complete page, try to concatenate the full message */ /* we can use the serial number and message ID as keys, as they are the same for all pages of a message */ msg_key = (serial_number << 16) + message_id; frag_data = fragment_add_seq_check(&gsm_cbs_reassembly_table, cbs_page_tvb, 0, pinfo, msg_key, NULL, (current_page -1), text_len, (current_page!=total_pages)); cbs_msg_tvb = process_reassembled_data(cbs_page_tvb, 0, pinfo, "Reassembled Cell Broadcast message", frag_data, &gsm_page_items, NULL, cbs_page_tree); } } } if (cbs_msg_tvb != NULL) { proto_item *cbs_msg_item = NULL; proto_tree *cbs_msg_tree = NULL; len = tvb_length(cbs_msg_tvb); col_append_str(pinfo->cinfo, COL_INFO, " (CBS Message)"); cbs_msg_item = proto_tree_add_protocol_format(proto_tree_get_root(tree), proto_cell_broadcast, cbs_msg_tvb, 0, len, "GSM Cell Broadcast Message"); cbs_msg_tree = proto_item_add_subtree(cbs_msg_item, ett_cbs_msg); proto_tree_add_string(cbs_msg_tree, hf_gsm_cbs_message_content, cbs_msg_tvb, 0, len, tvb_get_string_enc(wmem_packet_scope(), cbs_msg_tvb, 0, len, ENC_ASCII)); } }