packet-lpd.c

   1 /* packet-lpr.c
   2  * Routines for LPR and LPRng packet disassembly
   3  * Gilbert Ramirez <gram@verdict.uthscsa.edu>
   4  *
   5  * $Id: packet-lpd.c,v 1.7 1999/03/23 03:14:39 gram Exp $
   6  *
   7  * Ethereal - Network traffic analyzer
   8  * By Gerald Combs <gerald@unicom.net>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  25  */
  26
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #ifdef HAVE_SYS_TYPES_H
  32 # include <sys/types.h>
  33 #endif
  34
  35 #include <string.h>
  36
  37 #include <glib.h>
  38 #include "packet.h"
  39
  40 enum lpr_type { request, response };
  41
  42 void
  43 dissect_lpd(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
  44 {
  45         proto_tree      *lpd_tree;
  46         proto_item      *ti;
  47         enum lpr_type   lpr_packet_type;
  48         char            *newline, *printer, *line_pos;
  49         int                     substr_len, curr_offset;
  50
  51         /* This information comes from the LPRng HOWTO, which also describes
  52                 RFC 1179. http://www.astart.com/lprng/LPRng-HOWTO.html */
  53         char            *lpd_client_code[] = {
  54                 "Unknown command",
  55                 "LPC: start print",
  56                 "LPR: transfer a printer job",
  57                 "LPQ: print short form of queue status",
  58                 "LPQ: print long form of queue status",
  59                 "LPRM: remove jobs",
  60                 "LPRng lpc: do control operation",
  61                 "LPRng lpr: transfer a block format print job",
  62                 "LPRng lpc: secure command transfer",
  63                 "LPRng lpq: verbose status information"
  64         };
  65         char            *lpd_server_code[] = {
  66                 "Success: accepted, proceed",
  67                 "Queue not accepting jobs",
  68                 "Queue temporarily full, retry later",
  69                 "Bad job format, do not retry"
  70         };
  71
  72
  73         if (pd[offset+1] == '\n') {
  74                 lpr_packet_type = response;
  75         }
  76         else if (pd[offset] <= 9) {
  77                 lpr_packet_type = request;
  78         }
  79         else {
  80                 lpr_packet_type = response;
  81         }
  82
  83
  84         if (check_col(fd, COL_PROTOCOL))
  85                 col_add_str(fd, COL_PROTOCOL, "LPD");
  86         if (check_col(fd, COL_INFO)) {
  87                 if (lpr_packet_type == request) {
  88                         col_add_str(fd, COL_INFO, lpd_client_code[pd[offset]]);
  89                 }
  90                 else {
  91                         col_add_str(fd, COL_INFO, "LPD response");
  92                 }
  93         }
  94
  95         if (tree) {
  96                 ti = proto_tree_add_item(tree, offset, fd->cap_len - offset,
  97                   "Line Printer Daemon Protocol");
  98                 lpd_tree = proto_tree_new();
  99                 proto_item_add_subtree(ti, lpd_tree, ETT_LPD);
 100
 101                 if (lpr_packet_type == request) {
 102                         if (pd[offset] <= 9) {
 103                                 proto_tree_add_item(lpd_tree, offset,           1,
 104                                         lpd_client_code[pd[offset]]);
 105                         }
 106                         else {
 107                                 proto_tree_add_item(lpd_tree, offset,           1,
 108                                         lpd_client_code[0]);
 109                         }
 110                         printer = g_strdup(&pd[offset+1]);
 111
 112                         /* get rid of the new-line so that the tree prints out nicely */
 113                         if (printer[fd->cap_len - offset - 2] == 0x0a) {
 114                                 printer[fd->cap_len - offset - 2] = 0;
 115                         }
 116                         proto_tree_add_item(lpd_tree, offset+1, fd->cap_len - (offset+1),
 117                                         /*"Printer/options: %s", &pd[offset+1]);*/
 118                                         "Printer/options: %s", printer);
 119                         g_free(printer);
 120                 }
 121                 else {
 122                         if (pd[offset] <= 3) {
 123                                 proto_tree_add_item(lpd_tree, offset, 2, "Response: %s",
 124                                         lpd_server_code[pd[offset]]);
 125                         }
 126                         else {
 127                                 printer = strdup(&pd[offset]);
 128                                 line_pos = printer;
 129                                 curr_offset = offset;
 130                                 while (fd->cap_len > curr_offset) {
 131                                         newline = strchr(line_pos, '\n');
 132                                         if (!newline) {
 133                                                 proto_tree_add_item(lpd_tree, curr_offset,
 134                                                         fd->cap_len - offset, "Text: %s", line_pos);
 135                                                 break;
 136                                         }
 137                                         *newline = 0;
 138                                         substr_len = strlen(line_pos);
 139                                         proto_tree_add_item(lpd_tree, curr_offset, substr_len + 1,
 140                                                 "Text: %s", line_pos);
 141                                         curr_offset += substr_len + 1;
 142                                         line_pos = newline + 1;
 143                                 }
 144                         }
 145                 }
 146         }
 147 }
 148