Server undef UNICODE define WIN 3 2 LEAN AND MEAN include include include include pragma comment ( lib , Ws 2 3 2 lib ) define DEFAULT BUFLEN 5 1 2 define DEFAULT PORT 2 7 0 1 5 define MAX CLIENTS 1 0 int cdecl main ( void ) WSADATA wsaData int iResult SOCKET ListenSocket INVALID SOCKET SOCKET ClientSockets MAX CLIENTS INVALID SOCKET struct addrinfo result NULL, hints char recvbuf DEFAULT BUFLEN int recvbuflen DEFAULT BUFLEN fd set readfds int max sd , sd , activity, i iResult WSAStartup ( MAKEWORD ( 2 , 2 ) , wsaData ) if ( iResult 0 ) printf ( WSAStartup failed with error d , iResult ) return 1 ZeroMemory ( hints, sizeof ( hints ) ) hints ai family AF INET hints ai socktype SOCK STREAM hints ai protocol IPPROTO TCP hints ai flags AI PASSIVE iResult getaddrinfo ( NULL , DEFAULT PORT, hints, result ) if ( iResult 0 ) printf ( getaddrinfo failed with error d , iResult ) WSACleanup ( ) return 1 ListenSocket socket ( result ai family, result ai socktype, result ai protocol ) if ( ListenSocket INVALID SOCKET ) printf ( socket failed with error ld , WSAGetLastError ( ) ) freeaddrinfo ( result ) WSACleanup ( ) return 1 u long mode 1 1 to enable non blocking mode iResult ioctlsocket ( ListenSocket , FIONBIO, mode ) if ( iResult SOCKET ERROR ) printf ( ioctlsocket failed with error d , WSAGetLastError ( ) ) closesocket ( ListenSocket ) WSACleanup ( ) return 1 iResult bind ( ListenSocket , result ai addr, ( int ) result ai addrlen ) if ( iResult SOCKET ERROR ) printf ( bind failed with error d , WSAGetLastError ( ) ) freeaddrinfo ( result ) closesocket ( ListenSocket ) WSACleanup ( ) return 1 freeaddrinfo ( result ) iResult listen ( ListenSocket , SOMAXCONN ) if ( iResult SOCKET ERROR ) printf ( listen failed with error d , WSAGetLastError ( ) ) closesocket ( ListenSocket ) WSACleanup ( ) return 1 printf ( Server is running Waiting for connections ) while ( 1 ) FD ZERO ( readfds ) FD SET ( ListenSocket , readfds ) max sd ListenSocket for ( i 0 i MAX CLIENTS i ) sd ClientSockets i if ( sd 0 ) FD SET ( sd , readfds ) if ( sd max sd ) max sd sd activity select ( max sd 1 , readfds, NULL, NULL, NULL ) if ( activity SOCKET ERROR ) printf ( select failed with error d , WSAGetLastError ( ) ) break if ( FD ISSET ( ListenSocket , readfds ) ) SOCKET ClientSocket accept ( ListenSocket , NULL, NULL ) if ( ClientSocket INVALID SOCKET ) printf ( accept failed with error d , WSAGetLastError ( ) ) continue u long mode 1 1 to enable non blocking mode iResult ioctlsocket ( ClientSocket , FIONBIO, mode ) if ( iResult SOCKET ERROR ) printf ( ioctlsocket failed with error d , WSAGetLastError ( ) ) closesocket ( ClientSocket ) continue printf ( New connection accepted ) for ( i 0 i MAX CLIENTS i ) if ( ClientSockets i INVALID SOCKET ) ClientSockets i ClientSocket break for ( i 0 i MAX CLIENTS i ) sd ClientSockets i if ( FD ISSET ( sd , readfds ) ) iResult recv ( sd , recvbuf, recvbuflen, 0 ) if ( iResult 0 ) recvbuf iResult ' 0 ' printf ( Client d s , i , recvbuf ) send ( sd , recvbuf, iResult, 0 ) else if ( iResult 0 ) printf ( Client d disconnected , i ) closesocket ( sd ) ClientSockets i INVALID SOCKET else printf ( recv failed with error d , WSAGetLastError ( ) ) closesocket ( sd ) ClientSockets i INVALID SOCKET closesocket ( ListenSocket ) for ( i 0 i MAX CLIENTS i ) if ( ClientSockets i INVALID SOCKET ) closesocket ( ClientSockets i ) WSACleanup ( ) return 0 client define WIN 3 2 LEAN AND MEAN include include include include pragma comment ( lib , Ws 2 3 2 lib ) define DEFAULT BUFLEN 5 1 2 define DEFAULT PORT 2 7 0 1 5 int cdecl main ( int argc, char argv ) WSADATA wsaData SOCKET ConnectSocket INVALID SOCKET struct addrinfo result NULL, ptr NULL, hints char recvbuf DEFAULT BUFLEN int iResult int recvbuflen DEFAULT BUFLEN if ( argc 2 ) printf ( usage s server name , argv 0 ) return 1 iResult WSAStartup ( MAKEWORD ( 2 , 2 ) , wsaData ) if ( iResult 0 ) printf ( WSAStartup failed with error d , iResult ) return 1 ZeroMemory ( hints, sizeof ( hints ) ) hints ai family AF UNSPEC hints ai socktype SOCK STREAM hints ai protocol IPPROTO TCP iResult getaddrinfo ( argv 1 , DEFAULT PORT, hints, result ) if ( iResult 0 ) printf ( getaddrinfo failed with error d , iResult ) WSACleanup ( ) return 1 for ( ptr result ptr NULL ptr ptr ai next ) ConnectSocket socket ( ptr ai family, ptr ai socktype, ptr ai protocol ) if ( ConnectSocket INVALID SOCKET ) printf ( socket failed with error ld , WSAGetLastError ( ) ) WSACleanup ( ) return 1 u long mode 1 1 to enable non blocking mode iResult ioctlsocket ( ConnectSocket , FIONBIO, mode ) if ( iResult SOCKET ERROR ) printf ( ioctlsocket failed with error d , WSAGetLastError ( ) ) closesocket ( ConnectSocket ) WSACleanup ( ) return 1 iResult connect ( ConnectSocket , ptr ai addr, ( int ) ptr ai addrlen ) if ( iResult SOCKET ERROR )

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Question: Server #undef UNICODE #define WIN 3 2 _ LEAN _ AND _ MEAN #include #include #include #include #pragma comment ( lib , Ws 2

Server

#undef UNICODE

#define WIN

32_

LEAN

_

AND

_

MEAN

#include

#pragma comment

(

lib

, "

2_32 .

lib"

)

#define DEFAULT

_

BUFLEN

512

#define DEFAULT

_

PORT

" 27015 "

#define MAX

_

CLIENTS

10

int

__

cdecl main

(

void

)

{

WSADATA wsaData;

int iResult;

SOCKET ListenSocket

=

INVALID

_

SOCKET;

SOCKET ClientSockets

[

MAX

_

CLIENTS

] = {

INVALID

_

SOCKET

}

;

struct addrinfo

*

result

=

NULL, hints;

char recvbuf

[

DEFAULT

_

BUFLEN

]

;

int recvbuflen

=

DEFAULT

_

BUFLEN;

_

set readfds;

int max

_

,

,

activity, i;

iResult

=

WSAStartup

(

MAKEWORD

(2, 2),

&wsaData

)

;

(

iResult

! = 0) {

printf

("

WSAStartup failed with error:

%

",

iResult

)

;

return

1

;

}

ZeroMemory

(

&hints, sizeof

(

hints

))

;

hints.ai

_

family

=

_

INET;

hints.ai

_

socktype

=

SOCK

_

STREAM;

hints.ai

_

protocol

=

IPPROTO

_

TCP;

hints.ai

_

flags

=

_

PASSIVE;

iResult

=

getaddrinfo

(

NULL

,

DEFAULT

_

PORT, &hints, &result

)

;

(

iResult

! = 0) {

printf

("

getaddrinfo failed with error:

%

",

iResult

)

;

WSACleanup

()

;

return

1

;

}

ListenSocket

=

socket

(

result

- >

_

family, result

- >

_

socktype, result

- >

_

protocol

)

;

(

ListenSocket

= =

INVALID

_

SOCKET

) {

printf

("

socket failed with error:

%

",

WSAGetLastError

())

;

freeaddrinfo

(

result

)

;

WSACleanup

()

;

return

1

;

}

_

long mode

= 1

;

/ / 1

to enable non

-

blocking mode

iResult

=

ioctlsocket

(

ListenSocket

,

FIONBIO, &mode

)

;

(

iResult

= =

SOCKET

_

ERROR

) {

printf

("

ioctlsocket failed with error:

%

",

WSAGetLastError

())

;

closesocket

(

ListenSocket

)

;

WSACleanup

()

;

return

1

;

}

iResult

=

bind

(

ListenSocket

,

result

- >

_

addr,

(

int

)

result

- >

_

addrlen

)

;

(

iResult

= =

SOCKET

_

ERROR

) {

printf

("

bind failed with error:

%

",

WSAGetLastError

())

;

freeaddrinfo

(

result

)

;

closesocket

(

ListenSocket

)

;

WSACleanup

()

;

return

1

;

}

freeaddrinfo

(

result

)

;

iResult

=

listen

(

ListenSocket

,

SOMAXCONN

)

;

(

iResult

= =

SOCKET

_

ERROR

) {

printf

("

listen failed with error:

%

",

WSAGetLastError

())

;

closesocket

(

ListenSocket

)

;

WSACleanup

()

;

return

1

;

}

printf

("

Server is running. Waiting for connections...

")

;

while

(1) {

_

ZERO

(

&readfds

)

;

_

SET

(

ListenSocket

,

&readfds

)

;

max

_

=

ListenSocket;

for

(

= 0

; i

<

MAX

_

CLIENTS; i

+ +) {

=

ClientSockets

[

]

;

(

> 0) {

_

SET

(

,

&readfds

)

;

}

(

>

max

_

) {

max

_

=

sd;

}

}

activity

=

select

(

max

_

+ 1,

&readfds, NULL, NULL, NULL

)

;

(

activity

= =

SOCKET

_

ERROR

) {

printf

("

select failed with error:

%

",

WSAGetLastError

())

;

break;

}

(

_

ISSET

(

ListenSocket

,

&readfds

)) {

SOCKET ClientSocket

=

(

ListenSocket

,

NULL, NULL

)

;

(

ClientSocket

= =

INVALID

_

SOCKET

) {

printf

("

accept failed with error:

%

",

WSAGetLastError

())

;

continue;

}

_

long mode

= 1

;

/ / 1

to enable non

-

blocking mode

iResult

=

ioctlsocket

(

ClientSocket

,

FIONBIO, &mode

)

;

(

iResult

= =

SOCKET

_

ERROR

) {

printf

("

ioctlsocket failed with error:

%

",

WSAGetLastError

())

;

closesocket

(

ClientSocket

)

;

continue;

}

printf

("

New connection accepted

")

;

for

(

= 0

; i

<

MAX

_

CLIENTS; i

+ +) {

(

ClientSockets

[

] = =

INVALID

_

SOCKET

) {

ClientSockets

[

] =

ClientSocket;

break;

}

}

}

for

(

= 0

; i

<

MAX

_

CLIENTS; i

+ +) {

=

ClientSockets

[

]

;

(

_

ISSET

(

,

&readfds

)) {

iResult

=

recv

(

,

recvbuf, recvbuflen,

0)

;

(

iResult

> 0) {

recvbuf

[

iResult

] =' \ 0'

;

printf

("

Client

%

%

",

,

recvbuf

)

;

send

(

,

recvbuf, iResult,

0)

;

}

else if

(

iResult

= = 0) {

printf

("

Client

%

d disconnected

",

)

;

closesocket

(

)

;

ClientSockets

[

] =

INVALID

_

SOCKET;

}

else

{

printf

("

recv failed with error:

%

",

WSAGetLastError

())

;

closesocket

(

)

;

ClientSockets

[

] =

INVALID

_

SOCKET;

}

}

}

}

closesocket

(

ListenSocket

)

;

for

(

= 0

; i

<

MAX

_

CLIENTS; i

+ +) {

(

ClientSockets

[

]! =

INVALID

_

SOCKET

) {

closesocket

(

ClientSockets

[

])

;

}

}

WSACleanup

()

;

return

0

;

}

client

#define WIN

32_

LEAN

_

AND

_

MEAN

#include

#pragma comment

(

lib

, "

2_32 .

lib"

)

#define DEFAULT

_

BUFLEN

512

#define DEFAULT

_

PORT

" 27015 "

int

__

cdecl main

(

int argc, char

* *

argv

)

{

WSADATA wsaData;

SOCKET ConnectSocket

=

INVALID

_

SOCKET;

struct addrinfo

*

result

=

NULL,

*

ptr

=

NULL, hints;

char recvbuf

[

DEFAULT

_

BUFLEN

]

;

int iResult;

int recvbuflen

=

DEFAULT

_

BUFLEN;

(

argc

! = 2) {

printf

("

usage:

%

s server

-

name

",

argv

[0])

;

return

1

;

}

iResult

=

WSAStartup

(

MAKEWORD

(2, 2),

&wsaData

)

;

(

iResult

! = 0) {

printf

("

WSAStartup failed with error:

%

",

iResult

)

;

return

1

;

}

ZeroMemory

(

&hints, sizeof

(

hints

))

;

hints.ai

_

family

=

_

UNSPEC;

hints.ai

_

socktype

=

SOCK

_

STREAM;

hints.ai

_

protocol

=

IPPROTO

_

TCP;

iResult

=

getaddrinfo

(

argv

[1],

DEFAULT

_

PORT, &hints, &result

)

;

(

iResult

! = 0) {

printf

("

getaddrinfo failed with error:

%

",

iResult

)

;

WSACleanup

()

;

return

1

;

}

for

(

ptr

=

result; ptr

! =

NULL; ptr

=

ptr

- >

_

) {

ConnectSocket

=

socket

(

ptr

- >

_

family, ptr

- >

_

socktype, ptr

- >

_

protocol

)

;

(

ConnectSocket

= =

INVALID

_

SOCKET

) {

printf

("

socket failed with error:

%

",

WSAGetLastError

())

;

WSACleanup

()

;

return

1

;

}

_

long mode

= 1

;

/ / 1

to enable non

-

blocking mode

iResult

=

ioctlsocket

(

ConnectSocket

,

FIONBIO, &mode

)

;

(

iResult

= =

SOCKET

_

ERROR

) {

printf

("

ioctlsocket failed with error:

%

",

WSAGetLastError

())

;

closesocket

(

ConnectSocket

)

;

WSACleanup

()

;

return

1

;

}

iResult

=

connect

(

ConnectSocket

,

ptr

- >

_

addr,

(

int

)

ptr

- >

_

addrlen

)

;

(

iResult

= =

SOCKET

_

ERROR

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