static void
dissect_lpd(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *lpd_tree;
proto_item *ti, *hidden_item;
enum lpr_type lpr_packet_type;
guint8 code;
gint printer_len;
/* This information comes from the LPRng HOWTO, which also describes
RFC 1179. http://www.astart.com/lprng/LPRng-HOWTO.html */
static const value_string lpd_client_code[] = {
{ 1, "LPC: start print / jobcmd: abort" },
{ 2, "LPR: transfer a printer job / jobcmd: receive control file" },
{ 3, "LPQ: print short form of queue status / jobcmd: receive data file" },
{ 4, "LPQ: print long form of queue status" },
{ 5, "LPRM: remove jobs" },
{ 6, "LPRng lpc: do control operation" },
{ 7, "LPRng lpr: transfer a block format print job" },
{ 8, "LPRng lpc: secure command transfer" },
{ 9, "LPRng lpq: verbose status information" },
{ 0, NULL }
};
static const value_string lpd_server_code[] = {
{ 0, "Success: accepted, proceed" },
{ 1, "Queue not accepting jobs" },
{ 2, "Queue temporarily full, retry later" },
{ 3, "Bad job format, do not retry" },
{ 0, NULL }
};
col_set_str(pinfo->cinfo, COL_PROTOCOL, "LPD");
col_clear(pinfo->cinfo, COL_INFO);
/* rfc1179 states that all responses are 1 byte long */
code = tvb_get_guint8(tvb, 0);
if (tvb_reported_length(tvb) == 1) {
lpr_packet_type = response;
}
else if (code <= 9) {
lpr_packet_type = request;
}
else {
lpr_packet_type = unknown;
}
if (lpr_packet_type == request && code !=0) {
col_add_str(pinfo->cinfo, COL_INFO, val_to_str(code, lpd_client_code, "Unknown client code: %u"));
}
else if (lpr_packet_type == response) {
col_set_str(pinfo->cinfo, COL_INFO, "LPD response");
}
else {
col_set_str(pinfo->cinfo, COL_INFO, "LPD continuation");
}
if (tree) {
ti = proto_tree_add_item(tree, proto_lpd, tvb, 0, -1, ENC_NA);
lpd_tree = proto_item_add_subtree(ti, ett_lpd);
if (lpr_packet_type == response) {
hidden_item = proto_tree_add_boolean(lpd_tree, hf_lpd_response,
tvb, 0, 0, TRUE);
} else {
hidden_item = proto_tree_add_boolean(lpd_tree, hf_lpd_request,
tvb, 0, 0, TRUE);
}
PROTO_ITEM_SET_HIDDEN(hidden_item);
if (lpr_packet_type == request) {
printer_len = find_printer_string(tvb, 1);
if (code <= 9 && printer_len != -1) {
proto_tree_add_text(lpd_tree, tvb, 0, 1, "%s",
val_to_str(code, lpd_client_code, "Unknown client code: %u"));
proto_tree_add_text(lpd_tree, tvb, 1, printer_len,
"Printer/options: %s",
tvb_format_text(tvb, 1, printer_len));
}
else {
call_dissector(data_handle,tvb, pinfo, lpd_tree);
}
}
else if (lpr_packet_type == response) {
if (code <= 3) {
proto_tree_add_text(lpd_tree, tvb, 0, 1,
"Response: %s", val_to_str(code, lpd_server_code, "Unknown server code: %u"));
}
else {
call_dissector(data_handle,tvb, pinfo, lpd_tree);
}
}
else {
call_dissector(data_handle,tvb, pinfo, lpd_tree);
}
}
}
static void
dissect_lpd(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *lpd_tree;
proto_item *ti, *hidden_item;
enum lpr_type lpr_packet_type;
guint8 code;
gint printer_len;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "LPD");
col_clear(pinfo->cinfo, COL_INFO);
/* rfc1179 states that all responses are 1 byte long */
code = tvb_get_guint8(tvb, 0);
if (tvb_reported_length(tvb) == 1) {
lpr_packet_type = response;
}
else if (code <= 9) {
lpr_packet_type = request;
}
else {
lpr_packet_type = unknown;
}
if (lpr_packet_type == request && code !=0) {
col_add_str(pinfo->cinfo, COL_INFO, val_to_str(code, lpd_client_code, "Unknown client code: %u"));
}
else if (lpr_packet_type == response) {
col_set_str(pinfo->cinfo, COL_INFO, "LPD response");
}
else {
col_set_str(pinfo->cinfo, COL_INFO, "LPD continuation");
}
ti = proto_tree_add_item(tree, proto_lpd, tvb, 0, -1, ENC_NA);
lpd_tree = proto_item_add_subtree(ti, ett_lpd);
if (lpr_packet_type == response) {
hidden_item = proto_tree_add_boolean(lpd_tree, hf_lpd_response,
tvb, 0, 0, TRUE);
} else {
hidden_item = proto_tree_add_boolean(lpd_tree, hf_lpd_request,
tvb, 0, 0, TRUE);
}
PROTO_ITEM_SET_HIDDEN(hidden_item);
if (lpr_packet_type == request) {
printer_len = find_printer_string(tvb, 1);
if (code <= 9 && printer_len != -1) {
proto_tree_add_uint_format(lpd_tree, hf_lpd_client_code, tvb, 0, 1, code,
"%s", val_to_str(code, lpd_client_code, "Unknown client code: %u"));
proto_tree_add_item(lpd_tree, hf_lpd_printer_option, tvb, 1, printer_len, ENC_ASCII|ENC_NA);
}
else {
call_dissector(data_handle,tvb, pinfo, lpd_tree);
}
}
else if (lpr_packet_type == response) {
if (code <= 3) {
proto_tree_add_item(lpd_tree, hf_lpd_response_code, tvb, 0, 1, ENC_NA);
}
else {
call_dissector(data_handle,tvb, pinfo, lpd_tree);
}
}
else {
call_dissector(data_handle,tvb, pinfo, lpd_tree);
}
}
