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wireshark/packet-cups.c

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/* packet-cups.c
* Routines for Common Unix Printing System (CUPS) Browsing Protocol
* packet disassembly for the Ethereal network traffic analyzer.
*
* Charles Levert <charles@comm.polymtl.ca>
* Copyright 2001 Charles Levert
*
* $Id: packet-cups.c,v 1.5 2001/06/18 02:17:45 guy Exp $
*
*
* 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
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <string.h>
#include <ctype.h>
#include <glib.h>
#include "packet.h"
#include "strutil.h"
/**********************************************************************/
/* From cups/cups.h, GNU GPL, Copyright 1997-2001 by Easy Software Products. */
typedef guint32 cups_ptype_t; /**** Printer Type/Capability Bits ****/
enum /* Not a typedef'd enum so we can OR */
{
CUPS_PRINTER_LOCAL = 0x0000, /* Local printer or class */
CUPS_PRINTER_CLASS = 0x0001, /* Printer class */
CUPS_PRINTER_REMOTE = 0x0002, /* Remote printer or class */
CUPS_PRINTER_BW = 0x0004, /* Can do B&W printing */
CUPS_PRINTER_COLOR = 0x0008, /* Can do color printing */
CUPS_PRINTER_DUPLEX = 0x0010, /* Can do duplexing */
CUPS_PRINTER_STAPLE = 0x0020, /* Can staple output */
CUPS_PRINTER_COPIES = 0x0040, /* Can do copies */
CUPS_PRINTER_COLLATE = 0x0080, /* Can collage copies */
CUPS_PRINTER_PUNCH = 0x0100, /* Can punch output */
CUPS_PRINTER_COVER = 0x0200, /* Can cover output */
CUPS_PRINTER_BIND = 0x0400, /* Can bind output */
CUPS_PRINTER_SORT = 0x0800, /* Can sort output */
CUPS_PRINTER_SMALL = 0x1000, /* Can do Letter/Legal/A4 */
CUPS_PRINTER_MEDIUM = 0x2000, /* Can do Tabloid/B/C/A3/A2 */
CUPS_PRINTER_LARGE = 0x4000, /* Can do D/E/A1/A0 */
CUPS_PRINTER_VARIABLE = 0x8000, /* Can do variable sizes */
CUPS_PRINTER_IMPLICIT = 0x10000, /* Implicit class */
CUPS_PRINTER_DEFAULT = 0x20000, /* Default printer on network */
CUPS_PRINTER_OPTIONS = 0xfffc /* ~(CLASS | REMOTE | IMPLICIT) */
};
/* End insert from cups/cups.h */
typedef struct {
guint32 bit;
char *on_string;
char *off_string;
} cups_ptype_bit_info;
static const cups_ptype_bit_info cups_ptype_bits[] = {
{ CUPS_PRINTER_DEFAULT,
"Default printer on network", "Not default printer" },
{ CUPS_PRINTER_IMPLICIT,
"Implicit class", "Explicit class" },
{ CUPS_PRINTER_VARIABLE,
"Can print variable sizes", "Cannot print variable sizes" },
{ CUPS_PRINTER_LARGE,
"Can print up to 36x48 inches", "Cannot print up to 36x48 inches" },
{ CUPS_PRINTER_MEDIUM,
"Can print up to 18x24 inches", "Cannot print up to 18x24 inches" },
{ CUPS_PRINTER_SMALL,
"Can print up to 9x14 inches", "Cannot print up to 9x14 inches" },
{ CUPS_PRINTER_SORT,
"Can sort", "Cannot sort" },
{ CUPS_PRINTER_BIND,
"Can bind", "Cannot bind" },
{ CUPS_PRINTER_COVER,
"Can cover", "Cannot cover" },
{ CUPS_PRINTER_PUNCH,
"Can punch holes", "Cannot punch holes" },
{ CUPS_PRINTER_COLLATE,
"Can do fast collating", "Cannot do fast collating" },
{ CUPS_PRINTER_COPIES,
"Can do fast copies", "Cannot do fast copies" },
{ CUPS_PRINTER_STAPLE,
"Can staple", "Cannot staple" },
{ CUPS_PRINTER_DUPLEX,
"Can duplex", "Cannot duplex" },
{ CUPS_PRINTER_COLOR,
"Can print color", "Cannot print color" },
{ CUPS_PRINTER_BW,
"Can print black", "Cannot print black" },
{ CUPS_PRINTER_REMOTE,
"Remote", "Local (illegal)" },
{ CUPS_PRINTER_CLASS,
"Printer class", "Single printer" }
};
#define N_CUPS_PTYPE_BITS (sizeof cups_ptype_bits / sizeof cups_ptype_bits[0])
typedef enum _cups_state {
CUPS_IDLE = 3,
CUPS_PROCESSING,
CUPS_STOPPED
} cups_state_t;
static const value_string cups_state_values[] = {
{ CUPS_IDLE, "idle" },
{ CUPS_PROCESSING, "processing" },
{ CUPS_STOPPED, "stopped" }
};
static int proto_cups = -1;
static int hf_cups_ptype = -1;
static int hf_cups_state = -1;
static gint ett_cups = -1;
static gint ett_cups_ptype = -1;
/* This protocol is heavily related to IPP, but it is CUPS-specific
and non-standard. */
#define UDP_PORT_CUPS 631
#define PROTO_TAG_CUPS "CUPS"
static guint get_hex_uint(tvbuff_t *tvb, gint offset,
gint *next_offset);
static gboolean skip_space(tvbuff_t *tvb, gint offset,
gint *next_offset);
static const guint8* get_quoted_string(tvbuff_t *tvb, gint offset,
gint *next_offset, guint *len);
static const guint8* get_unquoted_string(tvbuff_t *tvb, gint offset,
gint *next_offset, guint *len);
/**********************************************************************/
static void
dissect_cups(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *cups_tree = 0;
proto_tree *ptype_subtree = 0;
proto_item *ti = 0;
gint offset = 0;
gint next_offset;
guint len;
unsigned int u;
const guint8 *str;
cups_ptype_t ptype;
unsigned int state;
if (check_col(pinfo->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, PROTO_TAG_CUPS);
if (check_col(pinfo->fd, COL_INFO))
col_clear(pinfo->fd, COL_INFO);
if (tree) {
ti = proto_tree_add_item(tree, proto_cups, tvb, offset,
tvb_length_remaining(tvb, offset), FALSE);
cups_tree = proto_item_add_subtree(ti, ett_cups);
}
/* Format (1450 bytes max.): */
/* type state uri ["location" ["info" ["make-and-model"]]]\n */
ptype = get_hex_uint(tvb, offset, &next_offset);
len = next_offset - offset;
if (cups_tree) {
ti = proto_tree_add_uint(cups_tree, hf_cups_ptype,
tvb, offset, len, ptype);
ptype_subtree = proto_item_add_subtree(ti, ett_cups_ptype);
for (u = 0; u < N_CUPS_PTYPE_BITS; u++) {
proto_tree_add_text(ptype_subtree, tvb, offset, len,
"%s",
decode_boolean_bitfield(ptype,
cups_ptype_bits[u].bit, sizeof (ptype)*8,
cups_ptype_bits[u].on_string,
cups_ptype_bits[u].off_string));
}
}
offset = next_offset;
if (!skip_space(tvb, offset, &next_offset))
return; /* end of packet */
offset = next_offset;
state = get_hex_uint(tvb, offset, &next_offset);
len = next_offset - offset;
if (cups_tree)
proto_tree_add_uint(cups_tree, hf_cups_state,
tvb, offset, len, state);
offset = next_offset;
if (!skip_space(tvb, offset, &next_offset))
return; /* end of packet */
offset = next_offset;
str = get_unquoted_string(tvb, offset, &next_offset, &len);
if (cups_tree)
proto_tree_add_text(cups_tree, tvb, offset, len,
"URI: %.*s",
(guint16) len, str);
if (check_col(pinfo->fd, COL_INFO))
col_add_fstr(pinfo->fd, COL_INFO,
"%.*s (%s)",
(guint16) len, str,
val_to_str(state, cups_state_values, "0x%x"));
offset = next_offset;
if (!cups_tree)
return;
if (!skip_space(tvb, offset, &next_offset))
return; /* end of packet */
offset = next_offset;
str = get_quoted_string(tvb, offset, &next_offset, &len);
proto_tree_add_text(cups_tree, tvb, offset+1, len,
"Location: \"%.*s\"",
(guint16) len, str);
offset = next_offset;
if (!skip_space(tvb, offset, &next_offset))
return; /* end of packet */
offset = next_offset;
str = get_quoted_string(tvb, offset, &next_offset, &len);
proto_tree_add_text(cups_tree, tvb, offset+1, len,
"Information: \"%.*s\"",
(guint16) len, str);
offset = next_offset;
if (!skip_space(tvb, offset, &next_offset))
return; /* end of packet */
offset = next_offset;
str = get_quoted_string(tvb, offset, &next_offset, &len);
proto_tree_add_text(cups_tree, tvb, offset+1, len,
"Make and model: \"%.*s\"",
(guint16) len, str);
offset = next_offset;
return;
}
static guint
get_hex_uint(tvbuff_t *tvb, gint offset, gint *next_offset)
{
int c;
guint u = 0;
while (isxdigit(c = tvb_get_guint8(tvb, offset))) {
if (isdigit(c))
c -= '0';
else if (isupper(c))
c -= 'A' - 10;
else if (islower(c))
c -= 'a' - 10;
else
c = 0; /* This should not happen. */
u = 16*u + c;
offset++;
}
*next_offset = offset;
return u;
}
static gboolean
skip_space(tvbuff_t *tvb, gint offset, gint *next_offset)
{
int c;
while ((c = tvb_get_guint8(tvb, offset)) == ' ')
offset++;
if (c == '\r' || c == '\n')
return FALSE; /* end of packet */
*next_offset = offset;
return TRUE;
}
static const guint8*
get_quoted_string(tvbuff_t *tvb, gint offset, gint *next_offset, guint *len)
{
int c;
const guint8* s = NULL;
guint l = 0;
gint o;
c = tvb_get_guint8(tvb, offset);
if (c == '"') {
o = tvb_find_guint8(tvb, offset+1, -1, '"');
if (o != -1) {
offset++;
l = o - offset;
s = tvb_get_ptr(tvb, offset, l);
offset = o + 1;
}
}
*next_offset = offset;
*len = l;
return s;
}
static const guint8*
get_unquoted_string(tvbuff_t *tvb, gint offset, gint *next_offset, guint *len)
{
const guint8* s = NULL;
guint l = 0;
gint o;
o = tvb_pbrk_guint8(tvb, offset, -1, " \t\r\n");
if (o != -1) {
l = o - offset;
s = tvb_get_ptr(tvb, offset, l);
offset = o;
}
*next_offset = offset;
*len = l;
return s;
}
/**********************************************************************/
void
proto_register_cups(void)
{
static hf_register_info hf[] = {
/* This one could be split in separate fields. */
{ &hf_cups_ptype,
{ "Type", "cups.ptype", FT_UINT32, BASE_HEX,
NULL, 0x0, "", HFILL }},
{ &hf_cups_state,
{ "State", "cups.state", FT_UINT8, BASE_HEX,
VALS(cups_state_values), 0x0, "", HFILL }}
};
static gint *ett[] = {
&ett_cups,
&ett_cups_ptype
};
proto_cups = proto_register_protocol(
"Common Unix Printing System (CUPS) Browsing Protocol",
"CUPS", "cups");
proto_register_field_array(proto_cups, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_cups(void)
{
dissector_add("udp.port", UDP_PORT_CUPS, dissect_cups, proto_cups);
}
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