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http://blog.csdn.net/manio/archive/2006/10/13/1333202.aspx
/*
 server 
*/
#include 
<
stdio.h
>
#include 
<
sys
/
types.h
>
#include 
<
netinet
/
in
.h
>
#include 
<
sys
/
socket.h
>
#include 
<
netdb.h
>
#include 
<
unistd.h
>
#include 
<
string
.h
>
#include 
<
arpa
/
inet.h
>
#define
 PORT 8848
#define
 BACKLOG 1
main()
{
    
int
 listenfd,connectfd;
    
struct
 sockaddr_in server;
    
struct
 sockaddr_in client;
    
int
 sin_size;
    
if
 (( listenfd 
=
 socket(AF_INET, SOCK_STREAM, 
0
)) 
==
 
-
1
)
    {
        perror(
"
Creating socket failed.
"
);
        
return
 
0
;
    }
    
int
 opt 
=
 SO_REUSEADDR;
    setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, 
&
opt, 
sizeof
(opt));
    bzero(
&
server,
sizeof
(server));
    server.sin_family 
=
 AF_INET;
    server.sin_port 
=
 htons(PORT);
    server.sin_addr.s_addr 
=
 htonl(INADDR_ANY);
    printf(
"
binding...
"
);
    
if
(bind(listenfd, (
struct
 sockaddr 
*
)
&
server, 
sizeof
(
struct
 sockaddr)) 
==
 
-
1
) {
        perror(
"
Bind error
"
);
        
ret


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1.sXid  http://os.51cto.com/art/200907/134874.htm
ÏÂÔØµØÖ·:http://freshmeat.net/projects/sxid/
2. LSAT
ÏÂÔØµØÖ·:http://usat.sourceforge.net/
3.portsentry
ÏÂÔØµØÖ·:http://sourceforge.net/projects/sentrytools/
4. fail2ban
http://www.fail2ban.org/
5.lids
http://www.lids.org/
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