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wireshark/epan/dissectors/packet-ifcp.c
Jaap Keuter 3f0fc1b232 FC: use ETHERTYPE_UNK when applicable, no excuses 
Two interlocking problems cause the dissection of FC to fail in some cases,
as shown in the capture of the related issue.

The FC dissector assumes that ETHERTYPE_UNK in the data structure passed
to it is coming from the MDS header dissector only, and thus that header
sizes have to be taken into account. This is not / no longer the case.
It always passes down ETHERTYPE_FCFT. Therefore the MDS header size
checking does not apply to ETHERTYP_UNK, so is removed as condition.

The other FC related dissectors were forced to setup a data structure to
pass to FC for it to handle that part of the frame. Because these weren't
related to ethernet, these lazily set the ethertype field in the data
structure to 0. This unfortunately matches ETHERTYPE_UNK, triggering the
MDS header size checking in FC, leading to this issue. With the first
problem resolved, now make it explicit that unknown ethertype is indicated
by ETHERTYPE_UNK, not '0'.

Addresses primary part of issue #17084
2020-12-15 20:26:29 +00:00

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/* packet-ifcp.c
* Routines for iFCP dissection
* RFC 3821, RFC 3643
*
* Copyright 2005 Aboo Valappil (valappil_aboo@emc.com)
* 2006 ronnie sahlberg major refactoring
*
*
* Significantly based on packet-fcip.c by
* Copyright 2001, Dinesh G Dutt (ddutt@cisco.com)
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/prefs.h>
#include "packet-tcp.h"
#include "packet-fc.h"
void proto_register_ifcp(void);
void proto_reg_handoff_ifcp(void);
#define iFCP_ENCAP_HEADER_LEN 28
#define iFCP_MIN_HEADER_LEN 16 /* upto frame len field */
typedef enum {
iFCP_EOFn = 0x41,
iFCP_EOFt = 0x42,
iFCP_EOFrt = 0x44,
iFCP_EOFdt = 0x46,
iFCP_EOFni = 0x49,
iFCP_EOFdti = 0x4E,
iFCP_EOFrti = 0x4F,
iFCP_EOFa = 0x50
} ifcp_eof_t;
typedef enum {
iFCP_SOFf = 0x28,
iFCP_SOFi4 = 0x29,
iFCP_SOFi2 = 0x2D,
iFCP_SOFi3 = 0x2E,
iFCP_SOFn4 = 0x31,
iFCP_SOFn2 = 0x35,
iFCP_SOFn3 = 0x36,
iFCP_SOFc4 = 0x39
} ifcp_sof_t;
typedef enum {
FCENCAP_PROTO_FCIP = 1,
FCENCAP_PROTO_iFCP = 2
} fcencap_proto_t;
static const value_string ifcp_eof_vals[] = {
{iFCP_EOFn, "EOFn" },
{iFCP_EOFt, "EOFt" },
{iFCP_EOFrt, "EOFrt" },
{iFCP_EOFdt, "EOFdt" },
{iFCP_EOFni, "EOFni" },
{iFCP_EOFdti, "EOFdti" },
{iFCP_EOFrti, "EOFrti" },
{iFCP_EOFa, "EOFa" },
{0, NULL},
};
static const value_string ifcp_sof_vals[] = {
{iFCP_SOFf, "SOFf" },
{iFCP_SOFi4, "SOFi4" },
{iFCP_SOFi2, "SOFi2" },
{iFCP_SOFi3, "SOFi3" },
{iFCP_SOFn4, "SOFn4" },
{iFCP_SOFn2, "SOFn2" },
{iFCP_SOFn3, "SOFn3" },
{iFCP_SOFc4, "SOFc4" },
{0, NULL},
};
static const value_string fcencap_proto_vals[] = {
{FCENCAP_PROTO_iFCP, "iFCP"},
{FCENCAP_PROTO_iFCP, "iFCP"},
{0, NULL},
};
/* RFC 4172 section 5.3.1 shows a chart of the iFCP encapsulated Header Format.
* It says that bytes 4-7 MUST be zeros. In reality most vendors are putting
* some information in these 4 bytes, particularly Nishon.
*/
static const guint8 ifcp_header_4_bytes[4] = {
0x02, 0x01, 0xFD, 0xFE
};
static int proto_ifcp = -1;
static int hf_ifcp_protocol = -1;
static int hf_ifcp_protocol_c = -1;
static int hf_ifcp_version = -1;
static int hf_ifcp_version_c = -1;
static int hf_ifcp_encap_flags_c = -1;
static int hf_ifcp_framelen = -1;
static int hf_ifcp_framelen_c = -1;
static int hf_ifcp_tsec = -1;
static int hf_ifcp_tusec = -1;
static int hf_ifcp_encap_crc = -1;
static int hf_ifcp_sof = -1;
static int hf_ifcp_sof_c = -1;
static int hf_ifcp_eof = -1;
static int hf_ifcp_eof_c = -1;
static int hf_ifcp_ls_command_acc = -1;
static int hf_ifcp_flags = -1;
static int hf_ifcp_flags_ses = -1;
static int hf_ifcp_flags_trp = -1;
static int hf_ifcp_flags_spc = -1;
static int hf_ifcp_common_flags = -1;
static int hf_ifcp_common_flags_crcv = -1;
static int ett_ifcp = -1;
static int ett_ifcp_sof = -1;
static int ett_ifcp_eof = -1;
static int ett_ifcp_flags = -1;
static int ett_ifcp_common_flags = -1;
static int ett_ifcp_protocol = -1;
static int ett_ifcp_version = -1;
static int ett_ifcp_frame_len = -1;
static gboolean ifcp_desegment = TRUE;
static dissector_handle_t ifcp_handle = NULL;
static dissector_handle_t fc_handle = NULL;
/* This function checks the first 16 bytes of the "header" that it looks sane
* and returns TRUE if this looks like iFCP and FALSE if it doesn't.
*/
static gboolean
ifcp_header_test(tvbuff_t *tvb, int offset)
{
guint16 flen, flen1;
/* we can only do this test if we have 16 bytes or more */
if(tvb_captured_length_remaining(tvb, offset)<iFCP_MIN_HEADER_LEN){
return FALSE;
}
/*
* As per the iFCP standard, the following tests must PASS:
* 1) Frame Length field validation -- 15 < Frame Length < 545;
* 2) Comparison of Frame Length field to its ones complement; and
* 3) A valid EOF is found in the word preceding the start of the next
* iFCP header as indicated by the Frame Length field, to be tested
* as follows:
* 1) Bits 24-31 and 16-23 contain identical legal EOF values (the
* list of legal EOF values is in the FC Frame Encapsulation
* [21]); and
* 2) Bits 8-15 and 0-7 contain the ones complement of the EOF
* value found in bits 24-31.
*
* As per the iFCP standard, in addition, at least 3 of the following
* set of tests must be performed to identify that we've located the
* start of an iFCP frame.
* a) Protocol# ones complement field (1 test);
* b) Version ones complement field (1 test);
* c) Replication of encapsulation word 0 in word 1 (1 test);
* d) Reserved field and its ones complement (2 tests);
* e) Flags field and its ones complement (2 tests);
* f) CRC field is equal to zero (1 test); (DON'T DO THIS TEST!)
* g) SOF fields and ones complement fields (4 tests);
* h) Format and values of FC header (1 test);
* i) CRC of FC Frame (2 tests);
* j) FC Frame Encapsulation header information in the next iFCP Frame
* (1 test).
*
* At least 3 of the 16 tests listed above SHALL be performed. Failure
* of any of the above tests actually performed SHALL indicate an
* encapsulation error and the FC Frame SHALL NOT be forwarded on to
* the FC Entity.
*/
/*
* Tests a, b and c
*/
if(tvb_memeql(tvb, offset, ifcp_header_4_bytes, 4) != 0){
return FALSE;
}
/* check the frame length */
flen=tvb_get_ntohs(tvb, offset+12)&0x03FF;
if((flen < 15) || (flen > 545)){
return FALSE;
}
/* check the complement of the frame length */
flen1=tvb_get_ntohs(tvb, offset+14)&0x03FF;
if(flen!=((~flen1)&0x03FF)){
return FALSE;
}
/* this should be good enough for our heuristics */
return TRUE;
}
#define IFCP_FLAGS_SES 0x04
#define IFCP_FLAGS_TRP 0x02
#define IFCP_FLAGS_SPC 0x01
static const true_false_string ifcp_flags_ses_tfs = {
"This is a SESSION CONTROL FRAME",
"This is a normal frame"
};
static const true_false_string ifcp_flags_trp_tfs = {
"Address TRANSPARENT Mode Enabled",
"Address TRANSLATION Mode Enabled"
};
static const true_false_string ifcp_flags_spc_tfs = {
"This frame requires SPECIAL PROCESSING",
"This is a normal frame"
};
static int
dissect_ifcpflags(tvbuff_t *tvb, int offset, proto_tree *parent_tree)
{
static int * const flags[] = {
&hf_ifcp_flags_ses,
&hf_ifcp_flags_trp,
&hf_ifcp_flags_spc,
NULL
};
proto_tree_add_bitmask(parent_tree, tvb, offset, hf_ifcp_flags,
ett_ifcp_flags, flags, ENC_BIG_ENDIAN);
offset++;
return offset;
}
#define IFCP_COMMON_FLAGS_CRCV 0x04
static void
dissect_commonflags(tvbuff_t *tvb, int offset, proto_tree *parent_tree)
{
static int * const flags[] = {
&hf_ifcp_common_flags_crcv,
NULL
};
proto_tree_add_bitmask(parent_tree, tvb, offset, hf_ifcp_common_flags,
ett_ifcp_common_flags, flags, ENC_BIG_ENDIAN);
}
static int
dissect_ifcp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data _U_)
{
gint offset = 0, frame_len = 0;
guint8 sof = 0, eof = 0;
proto_item *ti;
proto_tree *tree = NULL;
tvbuff_t *next_tvb;
guint8 protocol;
proto_tree *protocol_tree = NULL;
proto_tree *version_tree = NULL;
proto_tree *frame_len_tree = NULL;
proto_tree *sof_tree = NULL;
proto_tree *eof_tree = NULL;
fc_data_t fc_data;
/* verify we have a full header (do we need to do this? */
if(tvb_captured_length(tvb)<iFCP_ENCAP_HEADER_LEN){
return 0;
}
col_set_str(pinfo->cinfo, COL_PROTOCOL, "iFCP");
frame_len = (tvb_get_ntohs (tvb, offset+12) & 0x03FF)*4;
if (parent_tree) {
if (tvb_bytes_exist (tvb, offset, frame_len-4)) {
sof = tvb_get_guint8 (tvb, offset+iFCP_ENCAP_HEADER_LEN);
eof = tvb_get_guint8 (tvb, offset+frame_len - 4);
ti = proto_tree_add_protocol_format (parent_tree, proto_ifcp, tvb, offset,
iFCP_ENCAP_HEADER_LEN,
"iFCP (%s/%s)",
val_to_str (sof, ifcp_sof_vals,
"0x%x"),
val_to_str (eof, ifcp_eof_vals,
"0x%x"));
} else {
sof = tvb_get_guint8 (tvb, offset+iFCP_ENCAP_HEADER_LEN);
ti = proto_tree_add_protocol_format (parent_tree, proto_ifcp, tvb, offset,
iFCP_ENCAP_HEADER_LEN,
"iFCP (%s/%s)",
val_to_str (sof, ifcp_sof_vals,
"0x%x"),
"NA");
}
tree = proto_item_add_subtree (ti, ett_ifcp);
}
/* The Common FC Encap header */
/* protocol */
protocol = tvb_get_guint8 (tvb, offset);
ti=proto_tree_add_item(tree, hf_ifcp_protocol, tvb, offset, 1, ENC_BIG_ENDIAN);
protocol_tree=proto_item_add_subtree(ti, ett_ifcp_protocol);
offset++;
/* version */
ti=proto_tree_add_item(tree, hf_ifcp_version, tvb, offset, 1, ENC_BIG_ENDIAN);
version_tree=proto_item_add_subtree(ti, ett_ifcp_version);
offset++;
/* protocol complement */
proto_tree_add_item(protocol_tree, hf_ifcp_protocol_c, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/* version complement */
proto_tree_add_item(version_tree, hf_ifcp_version_c, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/* 4 reserved bytes */
offset+=4;
/* iFCP specific fields */
if(protocol==FCENCAP_PROTO_iFCP){
/* LS_COMMAND_ACC */
proto_tree_add_item(tree, hf_ifcp_ls_command_acc, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/* iFCP Flags */
offset=dissect_ifcpflags(tvb, offset, tree);
/* SOF */
ti=proto_tree_add_item(tree, hf_ifcp_sof, tvb, offset, 1, ENC_BIG_ENDIAN);
sof_tree=proto_item_add_subtree(ti, ett_ifcp_sof);
offset++;
/* EOF */
ti=proto_tree_add_item(tree, hf_ifcp_eof, tvb, offset, 1, ENC_BIG_ENDIAN);
eof_tree=proto_item_add_subtree(ti, ett_ifcp_eof);
offset++;
} else {
offset+=4;
sof_tree=tree; /* better than nothing */
eof_tree=tree;
}
/* Common Flags */
dissect_commonflags(tvb, offset, tree);
/* frame len */
ti=proto_tree_add_item(tree, hf_ifcp_framelen, tvb, offset, 2, ENC_BIG_ENDIAN);
frame_len_tree=proto_item_add_subtree(ti, ett_ifcp_frame_len);
offset+=2;
/* complement of flags and frame len */
proto_tree_add_item(frame_len_tree, hf_ifcp_encap_flags_c, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(frame_len_tree, hf_ifcp_framelen_c, tvb, offset, 2, ENC_BIG_ENDIAN);
offset+=2;
/* timestamp seconds */
proto_tree_add_item(tree, hf_ifcp_tsec, tvb, offset, 4, ENC_BIG_ENDIAN);
offset+=4;
/* timestamp fractions */
proto_tree_add_item(tree, hf_ifcp_tusec, tvb, offset, 4, ENC_BIG_ENDIAN);
offset+=4;
/* crc */
proto_tree_add_item(tree, hf_ifcp_encap_crc, tvb, offset, 4, ENC_BIG_ENDIAN);
offset+=4;
/* FC SOF/-SOF */
proto_tree_add_item(sof_tree, hf_ifcp_sof, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
proto_tree_add_item(sof_tree, hf_ifcp_sof, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
proto_tree_add_item(sof_tree, hf_ifcp_sof_c, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
proto_tree_add_item(sof_tree, hf_ifcp_sof_c, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/* FC EOF/-EOF */
if(tvb_bytes_exist(tvb, frame_len-4, 4)) {
proto_tree_add_item(eof_tree, hf_ifcp_eof, tvb, frame_len-4, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(eof_tree, hf_ifcp_eof, tvb, frame_len-3, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(eof_tree, hf_ifcp_eof_c, tvb, frame_len-2, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(eof_tree, hf_ifcp_eof_c, tvb, frame_len-1, 1, ENC_BIG_ENDIAN);
}
/* Call the FC Dissector if this is carrying an FC frame */
/* Set the SOF/EOF flags in the packet_info header */
fc_data.sof_eof = 0;
switch(sof){
case iFCP_SOFi3:
case iFCP_SOFi2:
case iFCP_SOFi4:
fc_data.sof_eof = FC_DATA_SOF_FIRST_FRAME;
break;
case iFCP_SOFf:
fc_data.sof_eof = FC_DATA_SOF_SOFF;
break;
default:
if(sof){
if (eof != iFCP_EOFn) {
fc_data.sof_eof |= FC_DATA_EOF_LAST_FRAME;
} else if (eof != iFCP_EOFt) {
fc_data.sof_eof |= FC_DATA_EOF_INVALID;
}
}
}
next_tvb=tvb_new_subset_length(tvb, offset, frame_len-offset-4);
fc_data.ethertype = ETHERTYPE_UNK;
if(fc_handle){
call_dissector_with_data(fc_handle, next_tvb, pinfo, parent_tree, &fc_data);
} else {
call_data_dissector(next_tvb, pinfo, parent_tree);
}
return tvb_captured_length(tvb);
}
static guint
get_ifcp_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_)
{
guint pdu_len;
if(!ifcp_header_test(tvb, offset)){
return 0;
}
pdu_len=(tvb_get_ntohs(tvb, offset+12)&0x03FF)*4;
return pdu_len;
}
static int
dissect_ifcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data)
{
tcp_dissect_pdus(tvb, pinfo, parent_tree, ifcp_desegment, iFCP_MIN_HEADER_LEN, get_ifcp_pdu_len, dissect_ifcp_pdu, data);
return tvb_captured_length(tvb);
}
/* This is called for those sessions where we have explicitly said
* this to be iFCP using "Decode As..."
* In this case we will not check the port number for sanity and just
* do as the user said.
*/
static int
dissect_ifcp_handle(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
{
return dissect_ifcp(tvb, pinfo, tree, data);
}
static gboolean
dissect_ifcp_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
if(!ifcp_header_test(tvb, 0)){
return FALSE;
}
dissect_ifcp(tvb, pinfo, tree, data);
/* our heuristics are so strong that if the heuristics above passed
* and the dissection of the pdu did not cause any exceptions
* then we can set this as our conversation dissector
*/
if(ifcp_handle){
conversation_t* ifcp_conv;
ifcp_conv=find_or_create_conversation(pinfo);
/* XXX why does this not work? it doesn't result in dissect_ifcp_handle being called look into later*/
conversation_set_dissector(ifcp_conv, ifcp_handle);
}
return TRUE;
}
void
proto_register_ifcp (void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{ &hf_ifcp_protocol,
{"Protocol", "ifcp.encap.proto", FT_UINT8, BASE_DEC, VALS(fcencap_proto_vals), 0,
NULL, HFILL }},
{ &hf_ifcp_protocol_c,
{"Protocol (1's Complement)", "ifcp.encap.protoc", FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL}},
{ &hf_ifcp_version,
{"Version", "ifcp.encap.version", FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL}},
{ &hf_ifcp_version_c,
{"Version (1's Complement)", "ifcp.encap.versionc", FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL}},
{ &hf_ifcp_encap_flags_c,
{"iFCP Encapsulation Flags (1's Complement)", "ifcp.encap_flagsc", FT_UINT8, BASE_HEX, NULL, 0xFC,
NULL, HFILL}},
{ &hf_ifcp_framelen,
{"Frame Length (in Words)", "ifcp.encap.framelen", FT_UINT16, BASE_DEC, NULL, 0x03FF,
NULL, HFILL}},
{ &hf_ifcp_framelen_c,
{"Frame Length (1's Complement)", "ifcp.encap.framelenc", FT_UINT16, BASE_DEC, NULL, 0x03FF,
NULL, HFILL}},
{ &hf_ifcp_tsec,
{"Time (secs)", "ifcp.encap.tsec", FT_UINT32, BASE_DEC, NULL, 0,
NULL, HFILL}},
{ &hf_ifcp_tusec,
{"Time (fraction)", "ifcp.encap.tusec", FT_UINT32, BASE_DEC, NULL, 0,
NULL, HFILL}},
{ &hf_ifcp_encap_crc,
{"CRC", "ifcp.encap.crc", FT_UINT32, BASE_HEX, NULL, 0,
NULL, HFILL}},
{ &hf_ifcp_sof,
{"SOF", "ifcp.sof", FT_UINT8, BASE_HEX, VALS (ifcp_sof_vals), 0,
NULL, HFILL}},
{ &hf_ifcp_eof,
{"EOF", "ifcp.eof", FT_UINT8, BASE_HEX, VALS (ifcp_eof_vals), 0,
NULL, HFILL}},
{ &hf_ifcp_sof_c,
{"SOF Compliment", "ifcp.sof_c", FT_UINT8, BASE_HEX, NULL , 0,
NULL, HFILL}},
{ &hf_ifcp_eof_c,
{"EOF Compliment", "ifcp.eof_c", FT_UINT8, BASE_HEX, NULL , 0,
NULL, HFILL}},
{ &hf_ifcp_ls_command_acc,
{"Ls Command Acc", "ifcp.ls_command_acc", FT_UINT8, BASE_HEX, NULL, 0,
NULL, HFILL}},
{ &hf_ifcp_common_flags,
{"Flags", "ifcp.common_flags", FT_UINT8, BASE_HEX , NULL, 0xfc,
NULL, HFILL }},
{ &hf_ifcp_common_flags_crcv,
{"CRC", "ifcp.common_flags.crcv", FT_BOOLEAN, 8, TFS(&tfs_valid_not_valid), IFCP_COMMON_FLAGS_CRCV,
"Is the CRC field valid?", HFILL }},
{ &hf_ifcp_flags,
{"iFCP Flags", "ifcp.flags", FT_UINT8, BASE_HEX , NULL, 0,
NULL, HFILL }},
{ &hf_ifcp_flags_ses,
{"SES", "ifcp.flags.ses", FT_BOOLEAN, 8, TFS(&ifcp_flags_ses_tfs), IFCP_FLAGS_SES,
"Is this a Session control frame", HFILL }},
{ &hf_ifcp_flags_trp,
{"TRP", "ifcp.flags.trp", FT_BOOLEAN, 8, TFS(&ifcp_flags_trp_tfs), IFCP_FLAGS_TRP,
"Is address transparent mode enabled", HFILL }},
{ &hf_ifcp_flags_spc,
{"SPC", "ifcp.flags.spc", FT_BOOLEAN, 8, TFS(&ifcp_flags_spc_tfs), IFCP_FLAGS_SPC,
"Is frame part of link service", HFILL }},
};
static gint *ett[] = {
&ett_ifcp,
&ett_ifcp_sof,
&ett_ifcp_eof,
&ett_ifcp_protocol,
&ett_ifcp_version,
&ett_ifcp_frame_len,
&ett_ifcp_flags,
&ett_ifcp_common_flags,
};
module_t *ifcp_module;
/* Register the protocol name and description */
proto_ifcp = proto_register_protocol("iFCP", "iFCP", "ifcp");
proto_register_field_array(proto_ifcp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
ifcp_module = prefs_register_protocol(proto_ifcp, NULL);
prefs_register_bool_preference(ifcp_module,
"desegment",
"Reassemble iFCP messages spanning multiple TCP segments",
"Whether the iFCP dissector should reassemble messages spanning multiple TCP segments."
" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
&ifcp_desegment);
prefs_register_obsolete_preference(ifcp_module, "target_port");
}
void
proto_reg_handoff_ifcp (void)
{
heur_dissector_add("tcp", dissect_ifcp_heur, "iFCP over TCP", "ifcp_tcp", proto_ifcp, HEURISTIC_ENABLE);
ifcp_handle = create_dissector_handle(dissect_ifcp_handle, proto_ifcp);
dissector_add_for_decode_as_with_preference("tcp.port", ifcp_handle);
fc_handle = find_dissector_add_dependency("fc_ifcp", proto_ifcp);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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