hakin9 - libpcap.pdf
(
3073 KB
)
Pobierz
3URJUDPPLQJ
ZLWK
/LESFDS
±
6QLI¿QJ
WKH
1HWZRUN
)URP
2XU
2ZQ
$SSOLFDWLRQ
$WWDFN
/XLV
0DUWLQ
*DUFLD
'LI¿FXOW\
6LQFH
WKH
¿UVW
PHVVDJH
ZDV
VHQW
RYHU
WKH
$53$1(7
LQ
FRPSXWHU
QHWZRUNV
KDYH
FKDQJHG
D
JUHDW
GHDO
%DFN
WKHQ
QHWZRUNV
ZHUH
VPDOO
DQG
SUREOHPV
ZHUH
VROYHG
XVLQJ
VLPSOH
GLDJQRVWLF
WRROV
$V
WKHVH
QHWZRUNV
JRW
PRUH
FRPSOH[
WKH
QHHG
IRU
PDQDJHPHQW
DQG
WURXEOHVKRRWLQJ
LQFUHDVHG
1
RZDGD\V
FRPSXWHU
QHWZRUNV
DUH
XVX
V\VWHPV
SRUW
NQRFNLQJ
GDHPRQV
SDVVZRUG
VQLIIHUV
$53
SRLVRQHUV
WUDFHURXWHUV
HWF
)LUVW
RI
DOO
OHW
V
UHYLHZ
KRZ
SDFNHW
FDSWXUH
ZRUNV
LQ
(WKHUQHW
EDVHG
QHWZRUNV
(YHU\
WLPH
D
QHWZRUN
FDUG
UHFHLYHV
DQ
(WKHUQHW
IUDPH
LW
FKHFNV
WKDW
LWV
GHVWLQDWLRQ
0$&
DGGUHVV
PDWFKHV
LWV
RZQ
,I
LW
GRHV
LW
JHQHUDWHV
DQ
LQWHU
UXSW
UHTXHVW
7KH
URXWLQH
LQ
FKDUJH
RI
KDQGOLQJ
WKH
LQWHUUXSW
LV
WKH
V\VWHP
V
QHWZRUN
FDUG
GULYHU
7KH
GULYHU
WLPHVWDPSV
UHFHLYHG
GDWD
DQG
FRS
DOO\
ODUJH
DQG
GLYHUVH
V\VWHPV
WKDW
FRPPXQLFDWH
XVLQJ
D
ZLGH
YDULHW\
RI
SURWRFROV
7KLV
FRPSOH[LW\
FUHDWHG
WKH
QHHG
IRU
PRUH
VRSKLVWLFDWHG
WRROV
WR
PRQLWRU
DQG
WURXEOHVKRRW
QHWZRUN
WUDI¿F
7RGD\
RQH
RI
WKH
FULWLFDO
WRROV
LQ
DQ\
QHWZRUN
DGPLQLVWUDWRU
WRRO
ER[
LV
WKH
VQLIIHU
6QLIIHUV
DOVR
NQRZQ
DV
SDFNHW
DQDO\]HUV
DUH
SURJUDPV
WKDW
KDYH
WKH
DELOLW\
WR
LQWHUFHSW
WKH
WUDI¿F
WKDW
SDVVHV
RYHU
D
QHWZRUN
7KH\
DUH
YHU\
SRSXODU
EHWZHHQ
QHWZRUN
DGPLQLVWUDWRUV
DQG
WKH
EODFN
KDW
FRPPXQLW\
EHFDXVH
WKH\
FDQ
EH
XVHG
IRU
ERWK
±
JRRG
DQG
HYLO
,Q
WKLV
DUWLFOH
ZH
ZLOO
JR
WKURXJK
PDLQ
SULQFLSOHV
RI
SDFNHW
FDSWXUH
DQG
LQWURGXFH
OLESFDS
DQ
RSHQ
VRXUFH
DQG
SRUWDEOH
SDFNHW
FDSWXUH
OLEUDU\
ZKLFK
LV
WKH
FRUH
RI
WRROV
OLNH
WFSGXPS
GVQLII
NLVPHW
VQRUW
RU
HWWHUFDS
:KDW
\RX
ZLOO
OHDUQ
‡
7KH
SULQFLSOHV
RI
SDFNHW
FDSWXUH
‡
+RZ
WR
FDSWXUH
SDFNHWV
XVLQJ
OLESFDS
‡
$VSHFWV
WR
FRQVLGHU
ZKHQ
ZULWLQJ
D
SDFNHW
FDS
WXUH
DSSOLFDWLRQ
:KDW
\RX
VKRXOG
NQRZ
3DFNHW
&DSWXUH
3DFNHW
FDSWXUH
LV
WKH
DFWLRQ
RI
FROOHFWLQJ
GDWD
DV
LW
WUDYHOV
RYHU
D
QHWZRUN
6QLIIHUV
DUH
WKH
EHVW
H[DPSOH
RI
SDFNHW
FDSWXUH
V\VWHPV
EXW
PDQ\
RWKHU
W\SHV
RI
DSSOLFDWLRQV
QHHG
WR
JUDE
SDFNHWV
RII
D
QHWZRUN
FDUG
7KRVH
LQFOXGH
QHWZRUN
VWDWLVWLFDO
WRROV
LQWUXVLRQ
GHWHFWLRQ
‡
7KH
&
SURJUDPPLQJ
ODQJXDJH
‡
7KH
EDVLFV
RI
QHWZRUNLQJ
DQG
WKH
26,
5HIHU
HQFH
0RGHO
‡
+RZ
FRPPRQ
SURWRFROV
OLNH
(WKHUQHW
7&3
,3
RU
$53
ZRUN
KDNLQ
ZZZ
KDNLQ
RUJ
HQ
3URJUDPPLQJ
ZLWK
/LESFDS
LHV
LW
IURP
WKH
FDUG
EXIIHU
WR
D
EORFN
RI
PHPRU\
LQ
NHUQHO
VSDFH
7KHQ
LW
GHWHUPLQHV
ZKLFK
W\SH
RI
SDFNHW
KDV
EHHQ
UHFHLYHG
ORRNLQJ
DW
WKH
HWKHU
W\SH
¿HOG
RI
WKH
(WKHUQHW
KHDGHU
DQG
SDVVHV
LW
WR
WKH
DSSURSULDWH
SURWRFRO
KDQGOHU
LQ
WKH
SURWRFRO
VWDFN
,Q
PRVW
FDVHV
WKH
IUDPH
ZLOO
FRQWDLQ
DQ
,3Y
GDWDJUDP
VR
WKH
,3Y
SDFNHW
KDQGOHU
ZLOO
EH
FDOOHG
7KLV
KDQGOHU
SHUIRUPV
D
QXPEHU
RI
FKHFN
WR
HQVXUH
IRU
H[DPSOH
WKDW
WKH
SDFNHW
LV
QRW
FRU
UXSW
DQG
WKDW
LV
DFWXDOO\
GHVWLQHG
IRU
WKLV
KRVW
,I
DOO
WHVWV
DUH
SDVVHG
WKH
,3
KHDGHUV
DUH
UHPRYHG
DQG
WKH
UHPDLQGHU
LV
SDVVHG
WR
WKH
QH[W
SURWRFRO
KDQGOHU
SUREDEO\
7&3
RU
8'3
7KLV
SURFHVV
LV
UHSHDWHG
XQWLO
WKH
GDWD
JHWV
WR
WKH
DSSOLFDWLRQ
OD\HU
ZKHUH
LW
LV
SURFHVVHG
E\
WKH
XVHU
OHYHO
DSSOLFDWLRQ
:KHQ
ZH
XVH
D
VQLIIHU
SDFNHWV
JR
WKURXJK
WKH
VDPH
SURFHVV
GH
VFULEHG
DERYH
EXW
ZLWK
RQH
GLIIHU
HQFH
WKH
QHWZRUN
GULYHU
DOVR
VHQGV
D
FRS\
RI
DQ\
UHFHLYHG
RU
WUDQVPLWWHG
SDFNHW
WR
D
SDUW
RI
WKH
NHUQHO
FDOOHG
WKH
SDFNHW
¿OWHU
3DFNHW
¿OWHUV
DUH
ZKDW
PDNHV
SDFNHW
FDSWXUH
SRV
VLEOH
%\
GHIDXOW
WKH\
OHW
DQ\
SDFNHW
WKURXJK
EXW
DV
ZH
ZLOO
VHH
ODWHU
WKH\
XVXDOO\
RIIHU
DGYDQFHG
¿OWHULQJ
FDSDELOLWLHV
$V
SDFNHW
FDSWXUH
PD\
LQYROYH
VHFXULW\
ULVNV
PRVW
V\VWHPV
UHTXLUH
DGPLQLVWUDWRU
SULYLOHJHV
LQ
RUGHU
WR
XVH
WKLV
IHDWXUH
)LJXUH
LOOXVWUDWHV
WKH
FDSWXUH
SURFHVV
3\WKRQ
-DYD
&
RU
5XE\
/LESFDS
UXQV
RQ
PRVW
81,;
OLNH
RSHUDWLQJ
V\VWHPV
/LQX[
6RODULV
%6'
+3
8;
7KHUH
LV
DOVR
D
:LQGRZV
YHU
VLRQ
QDPHG
:LQSFDS
7RGD\
OLESFDS
LV
PDLQWDLQHG
E\
WKH
7FSGXPS
*URXS
)XOO
GRFXPHQWDWLRQ
DQG
VRXUFH
FRGH
LV
DYDLODEOH
IURP
WKH
WFSGXPS
V
RI¿FLDO
VLWH
DW
KWWS
ZZZ
WFSGXPS
RUJ
KWWS
ZZZ
ZLQSFDS
RUJ
IRU
:LQSFDS
/LESFDS
/LESFDS
LV
DQ
RSHQ
VRXUFH
OLEUDU\
WKDW
SURYLGHV
D
KLJK
OHYHO
LQWHUIDFH
WR
QHW
ZRUN
SDFNHW
FDSWXUH
V\VWHPV
,W
ZDV
FUHDWHG
LQ
E\
0F&DQQH
/HUHV
DQG
-DFREVRQ
±
UHVHDUFKHUV
DW
WKH
/DZUHQFH
%HUNHOH\
1DWLRQDO
/DERUD
WRU\
IURP
WKH
8QLYHUVLW\
RI
&DOLIRUQLD
DW
%HUNHOH\
DV
SDUW
RI
D
UHVHDUFK
SURMHFW
WR
LQYHVWLJDWH
DQG
LPSURYH
7&3
DQG
,QWHUQHW
JDWHZD\
SHUIRUPDQFH
/LESFDS
DXWKRUV
PDLQ
REMHFWLYH
ZDV
WR
FUHDWH
D
SODWIRUP
LQGHSHQG
HQW
$3,
WR
HOLPLQDWH
WKH
QHHG
IRU
V\VWHP
GHSHQGHQW
SDFNHW
FDSWXUH
PRGXOHV
LQ
HDFK
DSSOLFDWLRQ
DV
YLU
WXDOO\
HYHU\
26
YHQGRU
LPSOHPHQWV
LWV
RZQ
FDSWXUH
PHFKDQLVPV
7KH
OLESFDS
$3,
LV
GHVLJQHG
WR
EH
XVHG
IURP
&
DQG
&
+RZHYHU
WKHUH
DUH
PDQ\
ZUDSSHUV
WKDW
DOORZ
LWV
XVH
IURP
ODQJXDJHV
OLNH
3HUO
2XU
)LUVW
6WHSV
:LWK
/LESFDS
1RZ
WKDW
ZH
NQRZ
WKH
EDVLFV
RI
SDFNHW
FDSWXUH
OHW
XV
ZULWH
RXU
RZQ
VQLI¿QJ
DSSOLFDWLRQ
7KH
¿UVW
WKLQJ
ZH
QHHG
LV
D
QHW
ZRUN
LQWHUIDFH
WR
OLVWHQ
RQ
:H
FDQ
HLWKHU
VSHFLI\
RQH
H[SOLFLWO\
RU
OHW
OLESFDS
JHW
RQH
IRU
XV
7KH
IXQFWLRQ
FKDU
SFDS B ORRNXSGHY
FKDU
HUUEXI
UHWXUQV
D
SRLQWHU
WR
D
VWULQJ
FRQWDLQ
LQJ
WKH
QDPH
RI
WKH
¿UVW
QHWZRUN
GHYLFH
WKDW
LV
VXLWDEOH
IRU
SDFNHW
FDS
WXUH
8VXDOO\
WKLV
IXQFWLRQ
LV
FDOOHG
ZKHQ
HQG
XVHUV
GR
QRW
VSHFLI\
DQ\
QHWZRUN
LQWHUIDFH
,W
LV
JHQHUDOO\
D
EDG
LGHD
WR
XVH
KDUG
FRGHG
LQWHU
IDFH
QDPHV
DV
WKH\
DUH
XVXDOO\
QRW
SRUWDEOH
DFURVV
SODWIRUPV
"
"
#
$$
$
$
$
"
$& "
$ "
%
$
$#
" &#
"
"
$
$
"%
"
"
&
"
"
!
#
"
!
)LJXUH
(OHPHQWV
LQYROYHG
LQ
WKH
FDSWXUH
SURFHVV
ZZZ
KDNLQ
RUJ
HQ
KDNLQ
$WWDFN
7KH
HUUEXI
DUJXPHQW
RI
SFDS B
ORRNXSGHY
LV
D
XVHU
VXSSOLHG
EXIIHU
WKDW
WKH
OLEUDU\
XVHV
WR
VWRUH
DQ
HUURU
PHVVDJH
LQ
FDVH
VRPHWKLQJ
JRHV
ZURQJ
0DQ\
RI
WKH
IXQFWLRQV
LPSOH
PHQWHG
E\
OLESFDS
WDNH
WKLV
SDUDP
HWHU
:KHQ
DOORFDWLQJ
WKH
EXIIHU
ZH
KDYH
WR
EH
FDUHIXO
EHFDXVH
LW
PXVW
EH
DEOH
WR
KROG
DW
OHDVW
3&$3 B (55%8) B
6,=(
E\WHV
FXUUHQWO\
GH¿QHG
DV
2QFH
ZH
KDYH
WKH
QDPH
RI
WKH
QHWZRUN
GHYLFH
ZH
KDYH
WR
RSHQ
LW
7KH
IXQFWLRQ
SFDS B W
SFDS B
RSHQ B OLYH
FRQVW
FKDU
GHYLFH
LQW
VQDSOHQ
LQW
SURPLVF
LQW
WR B PV
FKDU
HUUEXI
GRHV
WKDW
,W
UHWXUQV
DQ
LQWHUIDFH
KDQGOHU
RI
W\SH
SFDS B W
WKDW
ZLOO
EH
XVHG
ODWHU
ZKHQ
FDOOLQJ
WKH
UHVW
RI
WKH
IXQFWLRQV
SURYLGHG
E\
OLESFDS
7KH
¿UVW
DUJXPHQW
RI
SFDS B
RSHQ B OLYH
LV
D
VWULQJ
FRQWDLQLQJ
WKH
QDPH
RI
WKH
QHWZRUN
LQWHUIDFH
ZH
ZDQW
WR
RSHQ
7KH
VHFRQG
RQH
LV
WKH
PD[LPXP
QXPEHU
RI
E\WHV
WR
FDSWXUH
6HWWLQJ
D
ORZ
YDOXH
IRU
WKLV
SDUDPHWHU
PLJKW
EH
XVHIXO
LQ
FDVH
ZH
DUH
RQO\
LQWHUHVWHG
LQ
JUDEELQJ
KHDGHUV
RU
ZKHQ
SURJUDPPLQJ
IRU
HPEHGGHG
V\VWHPV
ZLWK
LPSRUWDQW
PHPRU\
OLPLWDWLRQV
7\SLFDOO\
WKH
PD[LPXP
(WKHUQHW
IUDPH
VL]H
LV
E\WHV
+RZHYHU
RWKHU
OLQN
W\SHV
OLNH
)'',
RU
KDYH
ELJ
JHU
OLPLWV
$
YDOXH
RI
VKRXOG
EH
HQRXJK
WR
KROG
DQ\
SDFNHW
IURP
DQ\
QHWZRUN
7KH
RSWLRQ
WR B PV
GH¿QHV
KRZ
PDQ\
PLOOLVHFRQGV
VKRXOG
WKH
NHUQHO
ZDLW
EHIRUH
FRS\LQJ
WKH
FDSWXUHG
LQIRUPDWLRQ
IURP
NHUQHO
VSDFH
WR
XVHU
VSDFH
&KDQJHV
RI
FRQWH[W
DUH
FRPSXWDWLRQDOO\
H[SHQVLYH
,I
ZH
DUH
FDSWXULQJ
D
KLJK
YROXPH
RI
QHWZRUN
WUDI¿F
LW
LV
EHWWHU
WR
OHW
WKH
NHUQHO
JURXS
VRPH
SDFNHWV
EHIRUH
FURVV
LQJ
WKH
NHUQHO
XVHUVSDFH
ERXQG
DU\
$
YDOXH
RI
]HUR
ZLOO
FDXVH
WKH
UHDG
RSHUDWLRQV
WR
ZDLW
IRUHYHU
XQWLO
HQRXJK
SDFNHWV
DUULYHG
WR
WKH
QHW
ZRUN
LQWHUIDFH
/LESFDS
GRFXPHQWD
WLRQ
GRHV
QRW
SURYLGH
DQ\
VXJJHVWLRQ
IRU
WKLV
YDOXH
7R
KDYH
DQ
LGHD
ZH
FDQ
H[DPLQH
ZKDW
RWKHU
VQLIIHUV
GR
7FSGXPS
XVHV
D
YDOXH
RI
GVQLII
XVHV
DQG
HWWHUFDS
GLVWLQJXLVKHV
EHWZHHQ
GLIIHUHQW
RSHUDWLQJ
V\VWHPV
XVLQJ
IRU
/LQX[
RU
2SHQ%6'
DQG
IRU
WKH
UHVW
7KH
SURPLVF
ÀDJ
GHFLGHV
ZKHWK
HU
WKH
QHWZRUN
LQWHUIDFH
VKRXOG
EH
SXW
LQWR
SURPLVFXRXV
PRGH
RU
QRW
7KDW
LV
ZKHWKHU
WKH
QHWZRUN
FDUG
VKRXOG
DFFHSW
SDFNHWV
WKDW
DUH
QRW
GHVWLQHG
WR
LW
RU
QRW
6SHFLI\
IRU
QRQ
SURPLVFXRXV
DQG
DQ\
RWKHU
YDOXH
IRU
SURPLVFXRXV
PRGH
1RWH
WKDW
HYHQ
LI
ZH
WHOO
OLESFDS
WR
OLVWHQ
/LVWLQJ
6WUXFWXUH
SFDSBSNWKGU
struct
SFDSBSNWKGU
^
struct
WLPHYDO
WV
7LPHVWDPS
RI
FDSWXUH
ESIBXBLQW
FDSOHQ
1XPEHU
RI
E\WHV
WKDW
ZHUH
VWRUHG
ESIBXBLQW
OHQ
7RWDO
OHQJWK
RI
WKH
SDFNHW
`
/LVWLQJ
6LPSOH
VQLIIHU
6LPSOH
6QLIIHU
7R
FRPSLOH
JFF
VLPSOHVQLIIHU
F
R
VLPSOHVQLIIHU
OSFDS
LQFOXGH
SFDS
K!
LQFOXGH
VWULQJ
K!
LQFOXGH
VWGOLE
K!
GH¿QH
0$;%<7(6
&$3785(
void
SURFHVV3DFNHW
XBFKDU
DUJ
const
struct
SFDSBSNWKGU
SNWKGU
const
XBFKDU
SDFNHW
^
int
L
FRXQWHU
int
DUJ
SULQWI
3DFNHW
&RXQW
G
?Q
FRXQWHU
SULQWI
5HFHLYHG
3DFNHW
6L]H
G
?Q
SNWKGU
!
OHQ
SULQWI
3D\ORDG
?Q
for
L
L
SNWKGU
!
OHQ
L
^
if
LVSULQW
SDFNHW
>
L
@
SULQWI
F
SDFNHW
>
L
@
else
SULQWI
if
L
L
__
L
SNWKGU
!
OHQ
SULQWI
?Q
`
return
`
int
PDLQ
^
int
L
FRXQW
SFDSBW
GHVFU
18//
char
HUUEXI
>
3&$3B(55%8)B6,=(
@
GHYLFH
18//
PHPVHW
HUUEXI
3&$3B(55%8)B6,=(
*HW
WKH
QDPH
RI
WKH
¿UVW
GHYLFH
VXLWDEOH
IRU
FDSWXUH
GHYLFH
SFDSBORRNXSGHY
HUUEXI
SULQWI
2SHQLQJ
GHYLFH
V
?Q
GHYLFH
2SHQ
GHYLFH
LQ
SURPLVFXRXV
PRGH
GHVFU
SFDSBRSHQBOLYH
GHYLFH
0$;%<7(6
&$3785(
HUUEXI
/RRS
IRUHYHU
FDOO
SURFHVV3DFNHW
IRU
HYHU\
UHFHLYHG
SDFNHW
SFDSBORRS
GHVFU
SURFHVV3DFNHW
XBFKDU
FRXQW
return
`
KDNLQ
ZZZ
KDNLQ
RUJ
HQ
$WWDFN
LQ
QRQ
SURPLVFXRXV
PRGH
LI
WKH
LQWHUIDFH
ZDV
DOUHDG\
LQ
SURPLVFX
RXV
PRGH
LW
PD\
VWD\
WKDW
ZD\
:H
VKRXOG
QRW
WDNH
IRU
JUDQWHG
WKDW
ZH
ZLOO
QRW
UHFHLYH
WUDI¿F
GHVWLQHG
IRU
RWKHU
KRVWV
LQVWHDG
LW
LV
EHWWHU
WR
XVH
WKH
¿OWHULQJ
FDSDELOLWLHV
WKDW
OLE
SFDS
SURYLGHV
DV
ZH
ZLOO
VHH
ODWHU
2QFH
ZH
KDYH
D
QHWZRUN
LQWHU
IDFH
RSHQ
IRU
SDFNHW
FDSWXUH
ZH
KDYH
WR
DFWXDOO\
WHOO
SFDS
WKDW
ZH
ZDQW
WR
VWDUW
JHWWLQJ
SDFNHWV
)RU
WKLV
ZH
KDYH
VRPH
RSWLRQV
<RX
DUH
SUREDEO\
ZRQGHULQJ
LI
WKH
IXQFWLRQ
RQO\
UHWXUQV
DQ
LQWHJHU
ZKHUH
DUH
WKH
SDFNHWV
WKDW
ZHUH
FDSWXUHG"
7KH
DQVZHU
LV
D
ELW
WULFN\
SFDS B ORRS
GRHV
QRW
UHWXUQ
WKRVH
SDFNHWV
LQVWHDG
LW
FDOOV
D
XVHU
GH¿QHG
IXQFWLRQ
HYHU\
WLPH
WKHUH
LV
D
SDFNHW
UHDG\
WR
EH
UHDG
7KLV
ZD\
ZH
FDQ
GR
RXU
RZQ
SURFHVV
LQJ
LQ
D
VHSDUDWH
IXQFWLRQ
LQVWHDG
RI
FDOOLQJ
SFDS B QH[W
LQ
D
ORRS
DQG
SURFHVV
HYHU\WKLQJ
LQVLGH
+RZHYHU
WKHUH
LV
D
SUREOHP
,I
SFDS B ORRS
FDOOV
RXU
IXQFWLRQ
KRZ
FDQ
ZH
SDVV
DU
JXPHQWV
WR
LW"
'R
ZH
KDYH
WR
XVH
XJO\
JOREDOV"
7KH
DQVZHU
LV
QR
WKH
OLESFDS
JX\V
WKRXJKW
DERXW
WKLV
SUREOHP
DQG
LQFOXGHG
D
ZD\
WR
SDVV
LQIRUPDWLRQ
WR
WKH
FDOOEDFN
IXQFWLRQ
7KLV
LV
WKH
XVHU
DUJXPHQW
7KLV
SRLQWHU
LV
SDVVHG
LQ
HYHU\
FDOO
7KH
SRLQWHU
LV
RI
W\SH
X B
FKDU
VR
ZH
ZLOO
KDYH
WR
FDVW
LW
IRU
RXU
RZQ
QHHGV
ZKHQ
FDOOLQJ
SFDS B ORRS
DQG
ZKHQ
XVLQJ
LW
LQVLGH
WKH
FDOOEDFN
IXQFWLRQ
2XU
SDFNHW
SURFHVVLQJ
IXQF
WLRQ
PXVW
KDYH
D
VSHFL¿F
SURWRW\SH
RWKHUZLVH
SFDS B ORRS
ZRXOGQ
W
NQRZ
KRZ
WR
XVH
LW
7KLV
LV
WKH
ZD\
LW
VKRXOG
EH
GHFODUHG
VWUXFW
SFDSBSNWKGU
SNWKGU
FRQVW
XB
FKDU
SDFNHW
7KH
¿UVW
DUJXPHQW
LV
WKH
XVHU
SRLQWHU
WKDW
ZH
SDVVHG
WR
SFDS B ORRS
WKH
VHFRQG
RQH
LV
D
SRLQWHU
WR
D
VWUXFWXUH
WKDW
FRQWDLQV
LQIRUPDWLRQ
DERXW
WKH
FDSWXUHG
SDFNHW
/LVWLQJ
VKRZV
WKH
GH¿QLWLRQ
RI
WKLV
VWUXFWXUH
7KH
FDSOHQ
PHPEHU
KDV
XVXDOO\
WKH
VDPH
YDOXH
DV
OHQ
H[FHSW
WKH
VLWXDWLRQ
ZKHQ
WKH
VL]H
RI
WKH
FDS
WXUHG
SDFNHW
H[FHHGV
WKH
VQDSOHQ
VSHFL¿HG
LQ
RSHQ B SFDS B OLYH
7KH
WKLUG
DOWHUQDWLYH
LV
WR
XVH
LQW
SFDS B GLVSDWFK
SFDS B W
S
LQW
FQW
SFDS B KDQGOHU
FDOOEDFN
X B FKDU
XVHU
ZKLFK
LV
VLPLODU
WR
SFDS B
ORRS
EXW
LW
DOVR
UHWXUQV
ZKHQ
WKH
WR B PV
WLPHRXW
VSHFL¿HG
LQ
SFDS B
RSHQ B OLYH
HODSVHV
/LVWLQJ
SURYLGHV
DQ
H[DPSOH
RI
D
VLPSOH
VQLIIHU
WKDW
SULQWV
WKH
UDZ
GDWD
WKDW
LW
FDSWXUHV
1RWH
WKDW
KHDGHU
¿OH
SFDS
K
PXVW
EH
LQFOXGHG
(UURU
FKHFNV
KDYH
EHHQ
RPLWWHG
IRU
FODULW\
‡
7KH
IXQFWLRQ
FRQVW
X B FKDU
SFDS B QH[W
SFDS B W
S
VWUXFW
SFDS B SNWKGU
K
WDNHV
WKH
SFDS B W
KDQGOHU
UHWXUQHG
E\
SFDS B RSHQ B OLYH
D
SRLQWHU
WR
D
VWUXFWXUH
RI
W\SH
SFDS B SNWKGU
DQG
UHWXUQV
WKH
¿UVW
SDFNHW
WKDW
DUULYHV
WR
WKH
QHWZRUN
LQWHUIDFH
‡
7KH
IXQFWLRQ
LQW
SFDS B
ORRS
SFDS B W
S
LQW
FQW
SFDS B KDQGOHU
FDOOEDFN
X B FKDU
XVHU
LV
XVHG
WR
FROOHFW
SDFNHWV
DQG
SURFHVV
WKHP
,W
ZLOO
QRW
UH
WXUQ
XQWLO
FQW
SDFNHWV
KDYH
EHHQ
FDSWXUHG
$
QHJDWLYH
FQW
YDOXH
ZLOO
FDXVH
SFDS B ORRS
WR
UHWXUQ
RQO\
LQ
FDVH
RI
HUURU
2QFH
:H
&DSWXUH
D
3DFNHW
:KHQ
D
SDFNHW
LV
FDSWXUHG
WKH
RQO\
WKLQJ
WKDW
RXU
DSSOLFDWLRQ
KDV
JRW
LV
D
EXQFK
RI
E\WHV
8VXDOO\
WKH
QHW
ZRUN
FDUG
GULYHU
DQG
WKH
SURWRFRO
VWDFN
SURFHVV
WKDW
GDWD
IRU
XV
EXW
ZKHQ
ZH
DUH
FDSWXULQJ
SDFNHWV
IURP
RXU
RZQ
DSSOLFDWLRQ
ZH
GR
LW
DW
WKH
ORZHVW
OHYHO
VR
ZH
DUH
WKH
RQHV
LQ
FKDUJH
RI
PDNLQJ
WKH
GDWD
UDWLRQDO
7R
GR
WKDW
WKHUH
DUH
VRPH
WKLQJV
WKDW
VKRXOG
EH
WDNHQ
LQWR
DFFRXQW
YRLG
IXQFWLRQBQDPH
XBFKDU
XVHUDUJ
FRQVW
'DWD
/LQN
7\SH
$OWKRXJK
(WKHUQHW
VHHPV
WR
EH
SUHVHQW
HYHU\ZKHUH
WKHUH
DUH
D
ORW
RI
GLIIHUHQW
WHFKQRORJLHV
DQG
VWDQGDUGV
WKDW
RSHUDWH
DW
WKH
GDWD
OLQN
OD\HU
,Q
RUGHU
WR
EH
DEOH
WR
GHFRGH
SDFNHWV
FDSWXUHG
IURP
D
QHWZRUN
LQWHUIDFH
ZH
PXVW
NQRZ
WKH
XQGHUO\LQJ
GDWD
OLQN
W\SH
VR
ZH
DUH
DEOH
WR
LQWHUSUHW
WKH
KHDGHUV
XVHG
LQ
WKDW
OD\HU
7KH
IXQFWLRQ
LQW
SF
DS B
GDWDOLQN
SFDS B W
S
UHWXUQV
WKH
OLQN
OD\HU
W\SH
RI
WKH
GHYLFH
RSHQHG
E\
SFDS B RSHQ B OLYH
/LESFDS
LV
DEOH
WR
GLVWLQJXLVK
RYHU
GLIIHUHQW
OLQN
)LJXUH
1RUPDO
SURJUDP
ÀRZ
RI
D
SFDS
DSSOLFDWLRQ
)LJXUH
'DWD
HQFDSVXODWLRQ
LQ
(WKHUQHW
QHWZRUNV
XVLQJ
WKH
7&3
,3
SURWRFRO
KDNLQ
ZZZ
KDNLQ
RUJ
HQ
Plik z chomika:
jimasek
Inne pliki z tego folderu:
hakin9 01.2003 - Oracle z punku widzenia intruza.pdf
(6337 KB)
hakin9 - libpcap.pdf
(3073 KB)
Inne foldery tego chomika:
Auto Świat
Chip
Elektronika dla Wszystkich
Elektronika Praktyczna
Java exPress
Zgłoś jeśli
naruszono regulamin