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Diffstat (limited to 'epan/dissectors/packet-lpd.c')
| -rw-r--r-- | epan/dissectors/packet-lpd.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/epan/dissectors/packet-lpd.c b/epan/dissectors/packet-lpd.c new file mode 100644 index 0000000000..d79ea39638 --- /dev/null +++ b/epan/dissectors/packet-lpd.c @@ -0,0 +1,196 @@ +/* packet-lpd.c + * Routines for LPR and LPRng packet disassembly + * Gilbert Ramirez <gram@alumni.rice.edu> + * + * $Id$ + * + * Ethereal - Network traffic analyzer + * By Gerald Combs <gerald@ethereal.com> + * Copyright 1998 Gerald Combs + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <string.h> + +#include <glib.h> +#include <epan/packet.h> + +#define TCP_PORT_PRINTER 515 + +static int proto_lpd = -1; +static int hf_lpd_response = -1; +static int hf_lpd_request = -1; + +static gint ett_lpd = -1; + +enum lpr_type { request, response, unknown }; + +static gint find_printer_string(tvbuff_t *tvb, int offset); + +static dissector_handle_t data_handle; + +static void +dissect_lpd(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + proto_tree *lpd_tree; + proto_item *ti; + 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 char *lpd_client_code[] = { + "Unknown command", + "LPC: start print / jobcmd: abort", + "LPR: transfer a printer job / jobcmd: receive control file", + "LPQ: print short form of queue status / jobcmd: receive data file", + "LPQ: print long form of queue status", + "LPRM: remove jobs", + "LPRng lpc: do control operation", + "LPRng lpr: transfer a block format print job", + "LPRng lpc: secure command transfer", + "LPRng lpq: verbose status information" + }; + static char *lpd_server_code[] = { + "Success: accepted, proceed", + "Queue not accepting jobs", + "Queue temporarily full, retry later", + "Bad job format, do not retry" + }; + + if (check_col(pinfo->cinfo, COL_PROTOCOL)) + col_set_str(pinfo->cinfo, COL_PROTOCOL, "LPD"); + if (check_col(pinfo->cinfo, COL_INFO)) + 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 (check_col(pinfo->cinfo, COL_INFO)) { + if (lpr_packet_type == request) { + col_set_str(pinfo->cinfo, COL_INFO, lpd_client_code[code]); + } + 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, FALSE); + lpd_tree = proto_item_add_subtree(ti, ett_lpd); + + if (lpr_packet_type == response) { + proto_tree_add_boolean_hidden(lpd_tree, hf_lpd_response, + tvb, 0, 0, TRUE); + } else { + proto_tree_add_boolean_hidden(lpd_tree, hf_lpd_request, + tvb, 0, 0, TRUE); + } + + 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, + lpd_client_code[code]); + 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, tree); + } + } + else if (lpr_packet_type == response) { + if (code <= 3) { + proto_tree_add_text(lpd_tree, tvb, 0, 1, + "Response: %s", lpd_server_code[code]); + } + else { + call_dissector(data_handle,tvb, pinfo, tree); + } + } + else { + call_dissector(data_handle,tvb, pinfo, tree); + } + } +} + + +static gint +find_printer_string(tvbuff_t *tvb, int offset) +{ + int i; + + /* try to find end of string, either '\n' or '\0' */ + i = tvb_find_guint8(tvb, offset, -1, '\0'); + if (i == -1) + i = tvb_find_guint8(tvb, offset, -1, '\n'); + if (i == -1) + return -1; + return i - offset; /* length of string */ +} + + +void +proto_register_lpd(void) +{ + static hf_register_info hf[] = { + { &hf_lpd_response, + { "Response", "lpd.response", + FT_BOOLEAN, BASE_NONE, NULL, 0x0, + "TRUE if LPD response", HFILL }}, + + { &hf_lpd_request, + { "Request", "lpd.request", + FT_BOOLEAN, BASE_NONE, NULL, 0x0, + "TRUE if LPD request", HFILL }} + }; + static gint *ett[] = { + &ett_lpd, + }; + + proto_lpd = proto_register_protocol("Line Printer Daemon Protocol", "LPD", "lpd"); + proto_register_field_array(proto_lpd, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); +} + +void +proto_reg_handoff_lpd(void) +{ + dissector_handle_t lpd_handle; + + lpd_handle = create_dissector_handle(dissect_lpd, proto_lpd); + dissector_add("tcp.port", TCP_PORT_PRINTER, lpd_handle); + data_handle = find_dissector("data"); +} |