void dissect_umts_cell_broadcast_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint8 sms_encoding;
guint32 offset = 0;
guint32 len;
proto_item *cbs_item;
proto_tree *cbs_tree, *cbs_subtree;
guint msg_len;
guint8 *msg;
tvbuff_t * cbs_msg_tvb = NULL;
len = tvb_length(tvb);
col_append_str(pinfo->cinfo, COL_PROTOCOL, " Cell Broadcast");
col_append_str(pinfo->cinfo, COL_INFO, " (CBS Message)");
cbs_item = proto_tree_add_protocol_format(proto_tree_get_root(tree), proto_cell_broadcast, tvb, 0, len, "Cell Broadcast");
cbs_tree = proto_item_add_subtree(cbs_item, ett_cbs_msg);
sms_encoding = dissect_cbs_data_coding_scheme(tvb, pinfo, cbs_tree, 0);
offset++;
cbs_msg_tvb = dissect_cbs_data(sms_encoding, tvb, cbs_tree, pinfo, offset );
msg_len = tvb_length(cbs_msg_tvb);
cbs_subtree = proto_tree_add_subtree_format(cbs_tree, tvb, offset, -1,
ett_cbs_msg, NULL, "Cell Broadcast Message Contents (length: %d)", msg_len);
msg = tvb_get_string_enc(wmem_packet_scope(), cbs_msg_tvb, 0, msg_len, ENC_ASCII);
proto_tree_add_string_format(cbs_subtree, hf_gsm_cbs_message_content, cbs_msg_tvb, 0, -1, msg, "%s", msg);
}
void dissect_umts_cell_broadcast_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint8 sms_encoding;
guint32 offset = 0;
guint32 len;
proto_item *cbs_item = NULL, *cbs_item2 = NULL;
proto_tree *cbs_tree = NULL, *cbs_subtree = NULL;
guint16 msg_len;
tvbuff_t * cbs_msg_tvb = NULL;
len = tvb_length(tvb);
col_append_str(pinfo->cinfo, COL_PROTOCOL, " Cell Broadcast");
col_append_str(pinfo->cinfo, COL_INFO, " (CBS Message)");
cbs_item = proto_tree_add_protocol_format(proto_tree_get_root(tree), proto_cell_broadcast, tvb, 0, len, "Cell Broadcast");
cbs_tree = proto_item_add_subtree(cbs_item, ett_cbs_msg);
sms_encoding = dissect_cbs_data_coding_scheme(tvb, pinfo, cbs_tree, 0);
offset++;
cbs_msg_tvb = dissect_cbs_data(sms_encoding, tvb, cbs_tree, pinfo, offset );
msg_len = tvb_length(cbs_msg_tvb);
cbs_item2 = proto_tree_add_text(cbs_tree, tvb, offset, -1, "Cell Broadcast Message Contents (length: %d)", msg_len);
cbs_subtree = proto_item_add_subtree(cbs_item2, ett_cbs_msg);
proto_tree_add_text(cbs_subtree, cbs_msg_tvb , 0, tvb_length(cbs_msg_tvb), "%s", tvb_get_ephemeral_string(cbs_msg_tvb, 0, msg_len));
}
/* 3GPP TS 23.041 version 11.4.0
* 9.4.2.2.5 CB Data
*/
static void
dissect_sabp_cb_data(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *item, *cbs_page_item;
proto_tree *subtree;
tvbuff_t *page_tvb, *unpacked_tvb;
int offset = 0;
int n;
guint8 nr_pages, len, cb_inf_msg_len;
/* Octet 1 Number-of-Pages */
nr_pages = tvb_get_guint8(tvb, offset);
proto_tree_add_item(tree, hf_sabp_no_of_pages, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/*
* NOTE: n equal to or less than 15
*/
if(nr_pages > 15){
/* Error */
return;
}
for (n = 0; n < nr_pages; n++) {
item = proto_tree_add_text(tree, tvb, offset, 83, "CB page %u data", n+1);
subtree = proto_item_add_subtree(item, ett_sabp_cbs_page);
/* octet 2 - 83 CBS-Message-Information-Page 1 */
cbs_page_item = proto_tree_add_item(subtree, hf_sabp_cb_msg_inf_page, tvb, offset, 82, ENC_BIG_ENDIAN);
cb_inf_msg_len = tvb_get_guint8(tvb,offset+82);
page_tvb = tvb_new_subset(tvb, offset, cb_inf_msg_len, cb_inf_msg_len);
unpacked_tvb = dissect_cbs_data(sms_encoding, page_tvb, subtree, pinfo, 0);
len = tvb_length(unpacked_tvb);
if (unpacked_tvb != NULL){
if (tree != NULL){
proto_tree *cbs_page_subtree = proto_item_add_subtree(cbs_page_item, ett_sabp_cbs_page_content);
proto_tree_add_item(cbs_page_subtree, hf_sabp_cbs_page_content, unpacked_tvb, 0, len, ENC_UTF_8|ENC_NA);
}
}
offset = offset+82;
/* 84 CBS-Message-Information-Length 1 */
proto_tree_add_item(subtree, hf_sabp_cb_inf_len, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
}
}
static void
dissect_cbsp_content_ie(tvbuff_t *tvb, packet_info *pinfo, guint offset, gint len, proto_tree *tree,
guint8 sms_encoding, proto_item *ti)
{
proto_item *cbs_page_item;
tvbuff_t *next_tvb, *unpacked_tvb;
const guint8 *pstr;
proto_tree_add_item(tree, hf_cbsp_user_info_length, tvb, offset, 1, ENC_NA);
cbs_page_item = proto_tree_add_item(tree, hf_cbsp_cb_msg_page, tvb, offset+1, len-1, ENC_NA);
next_tvb = tvb_new_subset_length(tvb, offset+1, len-1);
unpacked_tvb = dissect_cbs_data(sms_encoding, next_tvb, tree, pinfo, 0);
if (tree) {
guint captured_len = tvb_captured_length(unpacked_tvb);
proto_tree *cbs_page_subtree = proto_item_add_subtree(cbs_page_item, ett_cbsp_cbs_page_content);
proto_tree_add_item_ret_string(cbs_page_subtree, hf_cbsp_cbs_page_content, unpacked_tvb,
0, captured_len, ENC_UTF_8|ENC_NA, wmem_packet_scope(),
&pstr);
proto_item_append_text(ti, ": '%s'", pstr);
}
}
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)
{
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_reported_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;
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));
}
}