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_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--;
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));
}
}
