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); } }