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/*
Patchdiff2
Portions (C) 2010 - 2011 Nicolas Pouvesle
Portions (C) 2007 - 2009 Tenable Network Security, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as
published by the Free Software Foundation.
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, see <http://www.gnu.org/licenses/>.
*/
#
include
"
precomp.h
"
#
include
"
sig.h
"
#
include
"
x86.h
"
#
include
"
ppc.h
"
#
include
"
patchdiff.h
"
#
include
"
pchart.h
"
#
include
"
os.h
"
extern
cpu_t
patchdiff_cpu;
/*
------------------------------------------------
*/
/*
function : pget_func_name
*/
/*
description: Gets function name
*/
/*
------------------------------------------------
*/
char
*
pget_func_name
(
ea_t
ea,
char
* buffer,
size_t
blen) {
char
* pos;
#
if
IDA_SDK_VERSION <= 670
char
tmp[
512
];
if
(!
get_func_name
(ea, buffer, blen)) {
return
NULL
;
}
//
make sure this is not a c++ class/struct badly defined as a function
demangle_name
(tmp, blen, buffer, inf.
long_demnames
);
if
( (
strstr
(tmp,
"
public: static
"
) ||
strstr
(tmp,
"
private: static
"
)) &&
(!
strstr
(tmp,
"
(
"
) ||
strstr
(tmp,
"
public: static long (__stdcall
"
)) ) {
return
NULL
;
}
demangle_name
(buffer, blen, buffer, inf.
short_demnames
);
#
else
qstring name;
qstring demangled;
int32 dm_res;
if
(
get_func_name2
(&name, ea) ==
0
) {
return
NULL
;
}
qstrncpy
(buffer, name.
c_str
(), blen);
#
if
IDA_SDK_VERSION < 730
uint32 long_demnames = inf.
long_demnames
;
#
else
uint32 long_demnames =
inf_get_long_demnames
();
#
endif
dm_res =
demangle_name2
(&demangled, name.
c_str
(), long_demnames);
if
(dm_res >=
0
) {
if
( (demangled.
find
(
"
public: static
"
) != -
1
|| demangled.
find
(
"
private: static
"
) != -
1
) &&
(demangled.
find
(
"
(
"
) == -
1
|| demangled.
find
(
"
public: static long (__stdcall
"
) == -
1
) ) {
return
NULL
;
}
#
if
IDA_SDK_VERSION < 730
uint32 short_demnames = inf.
short_demnames
;
#
else
uint32 short_demnames =
inf_get_short_demnames
();
#
endif
dm_res =
demangle_name2
(&demangled, name.
c_str
(), short_demnames);
qstrncpy
(buffer, demangled.
c_str
(), blen);
}
#
endif
//
remove duplicates of the same name
pos =
strstr
(buffer,
"
Z$0
"
);
if
(pos) {
pos[
0
] =
'
\0
'
;
}
return
buffer;
}
/*
------------------------------------------------
*/
/*
function : sig_init
*/
/*
description: Allocates and initializes a new
*/
/*
function signature
*/
/*
------------------------------------------------
*/
psig_t
*
sig_init
() {
psig_t
* sig;
sig = (
psig_t
*)
qalloc
(
sizeof
(*sig));
if
(!sig) {
return
NULL
;
}
memset
(sig,
0
,
sizeof
(*sig));
sig->
mtype
=
DIFF_UNMATCHED
;
sig->
msig
=
NULL
;
return
sig;
}
/*
------------------------------------------------
*/
/*
function : frefs_free
*/
/*
description: Frees chained list
*/
/*
------------------------------------------------
*/
void
frefs_free
(
frefs_t
*frefs) {
fref_t
* fref, * next;
fref = frefs->
list
;
while
(fref) {
next = fref->
next
;
qfree
(fref);
fref = next;
}
qfree
(frefs);
}
/*
------------------------------------------------
*/
/*
function : dsig_free
*/
/*
description: Frees chained list
*/
/*
------------------------------------------------
*/
void
dsig_free
(
dpsig_t
*ds) {
dpsig_t
* next;
while
(ds) {
next = ds->
next
;
qfree
(ds);
ds = next;
}
qfree
(ds);
}
/*
------------------------------------------------
*/
/*
function : clist_free
*/
/*
description: Frees clist_t structure
*/
/*
------------------------------------------------
*/
void
clist_free
(
clist_t
*cl) {
dsig_free
(cl->
sigs
);
dsig_free
(cl->
msigs
);
qfree
(cl);
}
/*
------------------------------------------------
*/
/*
function : sig_free
*/
/*
description: Frees signature
*/
/*
------------------------------------------------
*/
void
sig_free
(
psig_t
*sig) {
if
(sig->
dl
.
lines
!=
NULL
) {
qfree
(sig->
dl
.
lines
);
}
if
(sig->
prefs
) {
frefs_free
(sig->
prefs
);
}
if
(sig->
srefs
) {
frefs_free
(sig->
srefs
);
}
if
(sig->
cp
) {
clist_free
(sig->
cp
);
}
if
(sig->
cs
) {
clist_free
(sig->
cs
);
}
qfree
(sig);
}
/*
------------------------------------------------
*/
/*
function : sig_set_name
*/
/*
description: Sets function signature name
*/
/*
------------------------------------------------
*/
void
sig_set_name
(
psig_t
*sig,
const
char
*name) {
sig->
name
= name;
}
void
sig_set_name
(
psig_t
*sig,
const
qstring &name) {
sig->
name
= name;
}
/*
------------------------------------------------
*/
/*
function : sig_set_start
*/
/*
description: Sets function start address
*/
/*
------------------------------------------------
*/
void
sig_set_start
(
psig_t
*sig,
ea_t
ea) {
sig->
startEA
= ea;
}
/*
------------------------------------------------
*/
/*
function : sig_get_start
*/
/*
description: Returns function start address
*/
/*
------------------------------------------------
*/
ea_t
sig_get_start
(
psig_t
*sig) {
return
sig->
startEA
;
}
/*
------------------------------------------------
*/
/*
function : sig_get_preds
*/
/*
description: Returns signature pred xrefs
*/
/*
------------------------------------------------
*/
frefs_t
*
sig_get_preds
(
psig_t
*sig) {
return
sig->
prefs
;
}
/*
------------------------------------------------
*/
/*
function : sig_get_succs
*/
/*
description: Returns signature succ xrefs
*/
/*
------------------------------------------------
*/
frefs_t
*
sig_get_succs
(
psig_t
*sig) {
return
sig->
srefs
;
}
/*
------------------------------------------------
*/
/*
function : sig_get_crefs
*/
/*
description: Returns signature cxrefs
*/
/*
------------------------------------------------
*/
clist_t
*
sig_get_crefs
(
psig_t
*sig,
int
type) {
if
(type ==
SIG_PRED
) {
return
sig->
cp
;
}
if
(type ==
SIG_SUCC
) {
return
sig->
cs
;
}
return
NULL
;
}
/*
------------------------------------------------
*/
/*
function : sig_set_crefs
*/
/*
description: Sets signature cxrefs
*/
/*
------------------------------------------------
*/
void
sig_set_crefs
(
psig_t
*sig,
int
type,
clist_t
*cl) {
if
(type ==
SIG_PRED
) {
sig->
cp
= cl;
}
else
if
(type ==
SIG_SUCC
) {
sig->
cs
= cl;
}
}
/*
------------------------------------------------
*/
/*
function : sig_set_nfile
*/
/*
description: Sets file number
*/
/*
------------------------------------------------
*/
void
sig_set_nfile
(
psig_t
*sig,
int
num) {
sig->
nfile
= num;
}
/*
------------------------------------------------
*/
/*
function : sig_set_matched_sig
*/
/*
description: Sets matched address
*/
/*
------------------------------------------------
*/
void
sig_set_matched_sig
(
psig_t
*sig,
psig_t
*sig2,
int
type) {
sig->
msig
= sig2;
sig->
matchedEA
= sig2->
startEA
;
sig2->
msig
= sig;
sig2->
matchedEA
= sig->
startEA
;
sig->
mtype
= sig2->
mtype
= type;
if
(sig->
crc_hash
!= sig2->
crc_hash
)
sig->
id_crc
= sig2->
id_crc
=
1
;
}
/*
------------------------------------------------
*/
/*
function : sig_get_matched_sig
*/
/*
description: Returns matched address
*/
/*
------------------------------------------------
*/
psig_t
*
sig_get_matched_sig
(
psig_t
*sig) {
return
sig->
msig
;
}
/*
------------------------------------------------
*/
/*
function : sig_get_matched_type
*/
/*
description: Returns matched type
*/
/*
------------------------------------------------
*/
int
sig_get_matched_type
(
psig_t
*sig) {
return
sig->
mtype
;
}
/*
------------------------------------------------
*/
/*
function : sig_add_fref
*/
/*
description: Adds a function reference to the
*/
/*
signature
*/
/*
------------------------------------------------
*/
int
sig_add_fref
(
frefs_t
**frefs,
ea_t
ea,
int
type,
char
rtype) {
fref_t
* ref, * next;
if
(!*frefs) {
*frefs = (
frefs_t
*)
qalloc
(
sizeof
(**frefs));
if
(!*frefs) {
return
-
1
;
}
memset
(*frefs,
0
,
sizeof
(**frefs));
}
else
{
//
don't add duplicates
next = (*frefs)->
list
;
while
(next) {
if
(next->
ea
== ea) {
return
-
1
;
}
next = next->
next
;
}
}
ref = (
fref_t
*)
qalloc
(
sizeof
(*ref));
if
(!ref) {
return
-
1
;
}
ref->
ea
= ea;
ref->
type
= type;
ref->
rtype
= rtype;
ref->
next
= (*frefs)->
list
;
(*frefs)->
num
++;
(*frefs)->
list
= ref;
return
0
;
}
/*
------------------------------------------------
*/
/*
function : sig_add_pref
*/
/*
description: Adds a function reference to the
*/
/*
signature
*/
/*
------------------------------------------------
*/
int
sig_add_pref
(
psig_t
*sig,
ea_t
ea,
int
type,
char
rtype) {
return
sig_add_fref
(&sig->
prefs
, ea, type, rtype);
}
/*
------------------------------------------------
*/
/*
function : sig_add_sref
*/
/*
description: Adds a function reference to the
*/
/*
signature
*/
/*
------------------------------------------------
*/
int
sig_add_sref
(
psig_t
*sig,
ea_t
ea,
int
type,
char
rtype) {
return
sig_add_fref
(&sig->
srefs
, ea, type, rtype);
}
/*
------------------------------------------------
*/
/*
function : is_fake_jump
*/
/*
description: Returns TRUE if the instruction at
*/
/*
ea is a jump
*/
/*
------------------------------------------------
*/
bool
is_fake_jump
(
ea_t
ea) {
switch
(patchdiff_cpu) {
case
CPU_X8632
:
case
CPU_X8664
:
if
(
x86_get_fake_jump
(ea) !=
BADADDR
) {
return
true
;
}
default
:
return
false
;
}
}
/*
------------------------------------------------
*/
/*
function : ignore_jump
*/
/*
description: Returns TRUE if the instruction at
*/
/*
ea is a jump that must be ignored
*/
/*
in the signature
*/
/*
------------------------------------------------
*/
bool
ignore_jump
(
ea_t
ea) {
switch
(patchdiff_cpu) {
case
CPU_X8632
:
case
CPU_X8664
:
if
(!
x86_is_direct_jump
(ea)) {
return
false
;
}
default
:
return
true
;
}
}
/*
------------------------------------------------
*/
/*
function : is_jump
*/
/*
description: Returns TRUE if the instruction at
*/
/*
ea is a jump
*/
/*
------------------------------------------------
*/
bool
is_jump
(
psig_t
*sig,
ea_t
ea,
bool
*call,
bool
*cj) {
xrefblk_t
xb;
cref_t
cr;
*call =
false
;
*cj =
false
;
if
(xb.
first_from
(ea,
XREF_FAR
)) {
cr = (
cref_t
)xb.
type
;
if
(xb.
iscode
&& (cr == fl_JF || cr == fl_JN)) {
if
(
ignore_jump
(ea)) {
return
true
;
}
else
{
*cj =
true
;
}
}
if
(xb.
iscode
&& (cr == fl_CF || cr == fl_CN)) {
if
(sig->
type
==
1
) {
sig_add_sref
(sig, xb.
to
,
0
,
CHECK_REF
);
}
*call =
true
;
}
}
else
{
return
is_fake_jump
(ea);
}
return
false
;
}
/*
------------------------------------------------
*/
/*
function : remove_instr
*/
/*
description: Returns TRUE if the instruction at
*/
/*
ea must not be added to the sig
*/
/*
------------------------------------------------
*/
bool
remove_instr
(
unsigned
char
byte,
ea_t
ea) {
switch
(patchdiff_cpu) {
case
CPU_X8632
:
case
CPU_X8664
:
return
x86_remove_instr
(byte, ea);
case
CPU_PPC
:
return
ppc_remove_instr
(byte, ea);
default
:
return
false
;
}
}
/*
------------------------------------------------
*/
/*
function : get_byte_with_optimization
*/
/*
description: Returns byte at address ea
*/
/*
note: Uses the processor optimized function if
*/
/*
available
*/
/*
------------------------------------------------
*/
char
get_byte_with_optimization
(
ea_t
ea) {
switch
(patchdiff_cpu) {
case
CPU_X8632
:
case
CPU_X8664
:
return
x86_get_byte
(ea);
case
CPU_PPC
:
return
ppc_get_byte
(ea);
default
: {
#
if
IDA_SDK_VERSION >= 700
insn_t
cmd;
decode_insn
(&cmd, ea);
#
else
decode_insn
(ea);
#
endif
return
(
char
)cmd.
itype
;
}
}
}
unsigned
long
ror
(
unsigned
long
val,
int
r) {
return
(val >> r) | (val << (
32
-r));
}
/*
------------------------------------------------
*/
/*
function : dline_add
*/
/*
description: Adds a disassembled line to the
*/
/*
signature
*/
/*
------------------------------------------------
*/
#
if
IDA_SDK_VERSION < 700
int
dline_add
(
dline_t
*dl,
ea_t
ea,
char
options) {
char
buf[
256
];
char
tmp[
256
];
char
dis[
256
];
char
addr[
30
];
char
*dll;
int
len;
flags_t
f;
buf[
0
] =
'
\0
'
;
f =
getFlags
(ea);
generate_disasm_line
(ea, dis,
sizeof
(dis));
decode_insn
(ea);
init_output_buffer
(buf,
sizeof
(buf));
//
Adds block label
if
(
has_dummy_name
(f)) {
get_nice_colored_name
(ea, tmp,
sizeof
(tmp),
GNCN_NOSEG
|
GNCN_NOFUNC
);
out_snprintf
(
"
%s
"
, tmp);
out_line
(
"
:
\n
"
,
COLOR_DATNAME
);
}
if
(options) {
qsnprintf
(addr,
sizeof
(addr),
"
%a
"
, ea);
out_snprintf
(
"
%s
"
, addr);
}
out_insert
(
get_output_ptr
(), dis);
term_output_buffer
();
len =
strlen
(buf);
if
(dl->
available
< (len +
3
)) {
dll = (
char
*)
qrealloc
(dl->
lines
,
sizeof
(
char
*) * (dl->
num
+ len +
256
));
if
(!dll) {
return
-
1
;
}
dl->
available
= len +
256
;
dl->
lines
= dll;
}
if
(dl->
num
) {
dl->
lines
[dl->
num
] =
'
\n
'
;
dl->
num
++;
}
memcpy
(&dl->
lines
[dl->
num
], buf, len);
dl->
available
-= len +
1
;
dl->
num
+= len;
dl->
lines
[dl->
num
] =
'
\0
'
;
return
0
;
}
#
else
int
dline_add
(
dline_t
*dl,
ea_t
ea,
char
options) {
qstring dis;
insn_t
cmd;
qstring tmp;
char
*dll;
int
len;
flags_t
f;
f =
get_flags
(ea);
generate_disasm_line
(&dis, ea);
decode_insn
(&cmd, ea);
outctx_base_t
*pctx =
create_outctx
(ea);
//
Adds block label
if
(
has_dummy_name
(f)) {
get_nice_colored_name
(&tmp, ea,
GNCN_NOSEG
|
GNCN_NOFUNC
);
pctx->
out_printf
(
"
%s
"
, tmp.
c_str
());
pctx->
out_line
(
"
:
\n
"
,
COLOR_DATNAME
);
}
if
(options) {
pctx->
out_printf
(
"
%a
"
, ea);
}
pctx->
out_printf
(
"
%s
"
, dis.
c_str
());
len = pctx->
outbuf
.
length
();
if
(dl->
available
< (len +
3
)) {
dll = (
char
*)
qrealloc
(dl->
lines
,
sizeof
(
char
*) * (dl->
num
+ len +
256
));
if
(!dll) {
return
-
1
;
}
dl->
available
= len +
256
;
dl->
lines
= dll;
}
if
(dl->
num
) {
dl->
lines
[dl->
num
] =
'
\n
'
;
dl->
num
++;
}
memcpy
(&dl->
lines
[dl->
num
], pctx->
outbuf
.
c_str
(), len);
dl->
available
-= len +
1
;
dl->
num
+= len;
dl->
lines
[dl->
num
] =
'
\0
'
;
delete
pctx;
return
0
;
}
#
endif
/*
------------------------------------------------
*/
/*
function : sig_add_address
*/
/*
description: Adds an address to the signature
*/
/*
------------------------------------------------
*/
int
sig_add_address
(
psig_t
*sig,
short
opcodes[
256
],
ea_t
ea,
bool
b,
bool
line,
char
options) {
unsigned
char
byte;
unsigned
char
buf[
200
];
uint32 s, i;
bool
call;
bool
cj;
ea_t
tea;
flags_t
f;
if
(line) {
dline_add
(&sig->
dl
, ea, options);
}
if
(
is_jump
(sig, ea, &call, &cj)) {
return
-
1
;
}
byte =
get_byte_with_optimization
(ea);
if
(
remove_instr
(byte, ea)) {
return
-
1
;
}
sig->
lines
++;
opcodes[byte]++;
if
(!b && !call) {
if
(cj) {
buf[
0
] = byte;
s =
1
;
}
else
{
s = (uint32)
get_item_size
(ea);
if
(s >
sizeof
(buf)) {
s =
sizeof
(buf);
}
get_many_bytes
(ea, buf, s);
}
for
(i =
0
; i < s; i++) {
sig->
crc_hash
+= buf[i];
sig->
crc_hash
+= ( sig->
crc_hash
<<
10
);
sig->
crc_hash
^= ( sig->
crc_hash
>>
6
);
}
}
else
if
(b) {
tea =
get_first_dref_from
(ea);
if
(tea !=
BADADDR
) {
f =
getFlags
(tea);
if
(
isASCII
(f)) {
opinfo_t
op_info;
#
if
IDA_SDK_VERSION < 700
get_opinfo
(tea,
0
, f, &op_info);
#
else
get_opinfo
(&op_info, tea,
0
, f);
#
endif
s =
get_max_ascii_length
(tea, op_info.
strtype
);
#
if
IDA_SDK_VERSION < 700
if
(!
get_ascii_contents2
(tea, s, op_info.
strtype
, buf,
sizeof
(buf))) {
s =
sizeof
(buf);
}
for
(i =
0
; i < s; i++) {
sig->
str_hash
+= buf[i] * i;
}
#
else
qstring strlit;
s =
get_strlit_contents
(&strlit, tea, s, op_info.
strtype
);
//
the following attempts to match behavior of pre-7.0 patchdiff
if
(s >
sizeof
(buf)) {
s =
sizeof
(buf);
}
for
(i =
0
; i < s; i++) {
sig->
str_hash
+= strlit[i] * i;
}
#
endif
}
}
}
return
0
;
}
/*
------------------------------------------------
*/
/*
function : sig_add_block
*/
/*
description: Adds a block to the signature
*/
/*
------------------------------------------------
*/
int
sig_add_block
(
psig_t
*sig,
short
opcodes[
256
],
ea_t
startEA,
ea_t
endEA,
bool
line,
char
options) {
ea_t
ea;
flags_t
flags;
bool
b;
ea = startEA;
while
(ea < endEA) {
flags =
getFlags
(ea);
if
(!
isCode
(flags)) {
return
-
1
;
}
b =
get_first_dref_from
(ea) !=
BADADDR
?
true
:
false
;
sig_add_address
(sig, opcodes, ea,
isOff
(flags,
OPND_ALL
) || b, line, options);
ea +=
get_item_size
(ea);
}
return
0
;
}
int
OS_CDECL
compare
(
const
void
*arg1,
const
void
*arg2) {
return
*((
short
*)arg1) - *((
short
*)arg2);
}
/*
------------------------------------------------
*/
/*
function : sig_calc_sighash
*/
/*
description: generates a sig/hash for the
*/
/*
signature opcodes
*/
/*
------------------------------------------------
*/
int
sig_calc_sighash
(
psig_t
*sig,
short
_opcodes[
256
],
int
do_sig) {
short
tmp;
short
opcodes[
256
];
int
i, j;
memcpy
(opcodes, _opcodes,
sizeof
(opcodes));
qsort
(opcodes,
256
,
sizeof
(
short
), compare);
for
(i =
0
; i <
256
; i++) {
for
(j =
0
; j <
255
; j++) {
if
(opcodes[j] > opcodes[j+
1
]) {
tmp = opcodes[j+
1
];
opcodes[j+
1
] = opcodes[j];
opcodes[j] = tmp;
}
}
}
sig->
hash2
=
0
;
if
(do_sig) {
sig->
sig
=
0
;
}
for
(i =
0
; i <
256
; i++) {
if
(do_sig) {
sig->
sig
+= opcodes[i] * i;
}
sig->
hash2
=
ror
(sig->
hash2
,
13
);
sig->
hash2
+= _opcodes[i];
}
return
0
;
}
/*
------------------------------------------------
*/
/*
function : sig_parse_dref_list
*/
/*
description: checks if the data ref is a class
*/
/*
like structure. Returns class ea
*/
/*
on success
*/
/*
------------------------------------------------
*/
ea_t
sig_parse_dref_list
(
psig_t
*sig,
ea_t
ea) {
ea_t
fref;
flags_t
f;
//
scan up
do
{
fref =
get_first_dref_from
(ea);
if
(fref ==
BADADDR
) {
return
BADADDR
;
}
f =
getFlags
(fref);
if
(!
isCode
(f)) {
return
BADADDR
;
}
fref =
get_first_dref_to
(ea);
if
(fref !=
BADADDR
) {
f =
getFlags
(fref);
if
(!
isCode
(f)) {
return
BADADDR
;
}
return
ea;
}
ea =
prev_visea
(ea);
}
while
(ea !=
BADADDR
);
return
ea;
}
/*
------------------------------------------------
*/
/*
function : sig_is_class
*/
/*
description: Returns true is the signature is
*/
/*
a class
*/
/*
------------------------------------------------
*/
bool
sig_is_class
(
psig_t
*sig) {
if
(sig->
sig
==
CLASS_SIG
&& sig->
hash
==
CLASS_SIG
&& sig->
crc_hash
==
CLASS_SIG
) {
return
true
;
}
return
false
;
}
/*
------------------------------------------------
*/
/*
function : sig_class_generate
*/
/*
description: generates a signature for the
*/
/*
class structure
*/
/*
------------------------------------------------
*/
psig_t
*
sig_class_generate
(
ea_t
ea) {
func_t
*xfct;
psig_t
*sig;
ea_t
fref;
sig =
sig_init
();
if
(!sig) {
return
NULL
;
}
//
Adds function start address
sig_set_start
(sig, ea);
//
Adds function name
sig->
name
.
sprnt
(
"
sub_%a
"
, ea);
//
Adds class references
fref =
get_first_dref_to
(ea);
while
(fref !=
BADADDR
) {
xfct =
get_func
(fref);
if
(xfct) {
sig_add_sref
(sig, xfct->
startEA
,
0
,
CHECK_REF
);
}
fref =
get_next_dref_to
(ea, fref);
}
sig->
hash
= sig->
crc_hash
= sig->
sig
=
CLASS_SIG
;
return
sig;
}
/*
------------------------------------------------
*/
/*
function : sig_generate
*/
/*
description: generates a signature for the
*/
/*
given function
*/
/*
------------------------------------------------
*/
psig_t
*
sig_generate
(
size_t
fct_num, qvector<
ea_t
> &class_l) {
func_t
*fct, *xfct;
pflow_chart_t
*fchart;
psig_t
*sig;
ea_t
fref, ea;
int
bnum, i;
char
buf[
512
];
short
opcodes[
256
];
qvector<
int
> call_list;
flags_t
f;
fct =
getn_func
(fct_num);
memset
(opcodes,
'
\0
'
,
sizeof
(opcodes));
fchart =
new
pflow_chart_t
(fct);
sig =
sig_init
();
if
(!sig) {
delete
fchart;
return
NULL
;
}
sig->
type
=
1
;
//
Adds function start address
sig_set_start
(sig, fct->
startEA
);
//
Adds function name
if
(
pget_func_name
(fct->
startEA
, buf,
sizeof
(buf))) {
sig_set_name
(sig, buf);
}
else
{
return
NULL
;
}
//
Adds function references
fref =
get_first_dref_to
(fct->
startEA
);
while
(fref !=
BADADDR
) {
f =
getFlags
(fref);
if
(
isCode
(f)) {
xfct =
get_func
(fref);
if
(xfct && xfct->
startEA
!= fct->
startEA
) {
sig_add_pref
(sig, xfct->
startEA
,
0
,
CHECK_REF
);
}
}
else
{
ea =
sig_parse_dref_list
(sig, fref);
if
(ea !=
BADADDR
) {
sig_add_pref
(sig, ea,
0
,
CHECK_REF
);
class_l.
add_unique
(ea);
}
}
fref =
get_next_dref_to
(fct->
startEA
, fref);
}
//
Adds each block to the signature
bnum = fchart->
nproper
;
sig->
hash
=
0
;
sig->
sig
=
0
;
for
(i =
0
; i < bnum; i++) {
int
j;
int
ttype;
int
smax = fchart->
nsucc
(i);
sig->
sig
+= (i +
1
) + smax * i;
sig_add_block
(sig, opcodes, fchart->
blocks
[i].
startEA
, fchart->
blocks
[i].
endEA
,
0
,
0
);
for
(j =
0
; j < smax; j++) {
sig->
hash
=
ror
(sig->
hash
,
13
);
ttype = fchart->
blocks
[i].
succ
[j].
type
;
if
(ttype ==
2
) {
ttype--;
}
sig->
hash
+= ttype;
}
}
sig_calc_sighash
(sig, opcodes,
0
);
delete
fchart;
return
sig;
}
/*
------------------------------------------------
*/
/*
function : sig_save
*/
/*
description: Saves signature refs to disk
*/
/*
------------------------------------------------
*/
void
sig_save_refs
(
FILE
*fp,
frefs_t
*refs) {
int
num, i;
fref_t
* tmp;
if
(refs) {
num = refs->
num
;
qfwrite
(fp, &num,
sizeof
(num));
tmp = refs->
list
;
for
(i =
0
; i < num; i++) {
qfwrite
(fp, &tmp->
ea
,
sizeof
(tmp->
ea
));
qfwrite
(fp, &tmp->
type
,
sizeof
(tmp->
type
));
tmp = tmp->
next
;
}
}
else
{
num =
0
;
qfwrite
(fp, &num,
sizeof
(num));
}
}
/*
------------------------------------------------
*/
/*
function : sig_save
*/
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