This assignment is due on Saturday and I need help right away.

Instructions:

Develop a C program that works with sockets by creating a simple server$/$client setup. The sever and client code are below. I need the modified code to be as close to the original code as possible! Only change the code enough to implement the modifications listed below please.

Project Implementation:

$$ Modify the client to:

$$ Accept input from a user on STDIN

$$ Put this in a loop and send until the user quits the client by sending a value of

$$quit$$

$$ Send the string to the server, which will send it back

$$ Print the value received back from the server.

$$ Modify the server to:

$$ Print the value received from the user before sending it back

$$ When $$quit$$ is received, stop the server

Here is the client code:

#include $"$tcpSC$.$h$"$

#if defined$(\_$WIN$32)$

#include

#endif

int main$($int argc, char $*$argv$[])\{$

#if defined$(\_$WIN$32)$

WSADATA d;

if $($WSAStartup$($MAKEWORD$(2,2),$ &d$))\{$

fprintf$($stderr$,$ "Failed to initialize.

$")$;

return $1$;

$\}$

#endif

if $($argc $<3)\{$

fprintf$($stderr$,$ "usage: tcp$\_$client hostname port

$")$;

return $1$;

$\}$

printf$("$Configuring remote address...

$")$;

struct addrinfo hints;

memset$($&hints, $0,$ sizeof$($hints$))$;

hints.ai$\_$socktype $=$ SOCK$\_$STREAM;

struct addrinfo $*$peer$\_$address;

if $($getaddrinfo$($argv$[1],$ argv$[2],$ &hints, &peer$\_$address$))\{$

fprintf$($stderr$,$ "getaddrinfo$()$ failed. $(\%$d$)$

$",$ GETSOCKETERRNO$())$;

return $1$;

$\}$

printf$("$Remote address is: $")$;

char address$\_$buffer$[100]$;

char service$\_$buffer$[100]$;

getnameinfo$($peer$\_$address$->$ai$\_$addr, peer$\_$address$->$ai$\_$addrlen,

address$\_$buffer, sizeof$($address$\_$buffer$),$

service$\_$buffer, sizeof$($service$\_$buffer$),$

NI$\_$NUMERICHOST$)$;

printf$("\%$s $\%$s

$",$ address$\_$buffer, service$\_$buffer$)$;

printf$("$Creating socket...

$")$;

SOCKET socket$\_$peer;

socket$\_$peer $=$ socket$($peer$\_$address$->$ai$\_$family,

peer$\_$address$->$ai$\_$socktype, peer$\_$address$->$ai$\_$protocol$)$;

if $(!$ISVALIDSOCKET$($socket$\_$peer$))\{$

fprintf$($stderr$,$ "socket$()$ failed. $(\%$d$)$

$",$ GETSOCKETERRNO$())$;

return $1$;

$\}$

printf$("$Connecting$...$

$")$;

if $($connect$($socket$\_$peer,

peer$\_$address$->$ai$\_$addr, peer$\_$address$->$ai$\_$addrlen$))\{$

fprintf$($stderr$,$ "connect$()$ failed. $(\%$d$)$

$",$ GETSOCKETERRNO$())$;

return $1$;

$\}$

freeaddrinfo$($peer$\_$address$)$;

printf$("$Connected$.$

$")$;

printf$("$To send data, enter text followed by enter.

$")$;

while$(1)\{$

fd$\_$set reads;

FD$\_$ZERO$($&reads$)$;

FD$\_$SET$($socket$\_$peer, &reads$)$;

#if $!$defined$(\_$WIN$32)$

FD$\_$SET$(0,$ &reads$)$;

#endif

struct timeval timeout;

timeout.tv$\_$sec $=0$;

timeout.tv$\_$usec $=100000$;

if $($select$($socket$\_$peer$+1,$ &reads, $0,0,$ &timeout$)<0)\{$

fprintf$($stderr$,$ "select$()$ failed. $(\%$d$)$

$",$ GETSOCKETERRNO$())$;

return $1$;

$\}$

if $($FD$\_$ISSET$($socket$\_$peer, &reads$))\{$

char read$[4096]$;

int bytes$\_$received $=$ recv$($socket$\_$peer, read, $4096,0)$;

if $($bytes$\_$received $<1)\{$

printf$("$Connection closed by peer.

$")$;

break;

$\}$

printf$("$Received $(\%$d bytes$)$: $\%.*$s$",$

bytes$\_$received, bytes$\_$received, read$)$;

$\}$

#if defined$(\_$WIN$32)$

if$(\_$kbhit$())\{$

#else

if$($FD$\_$ISSET$(0,$ &reads$))\{$

#endif

char read$[4096]$;

if $(!$fgets$($read$,4096,$ stdin$))$ break;

printf$("$Sending: $\%$s$",$ read$)$;

int bytes$\_$sent $=$ send$($socket$\_$peer, read, strlen$($read$),0)$;

printf$("$Sent $\%$d bytes.

$",$ bytes$\_$sent$)$;

$\}$

$\}//$end while$(1)$

printf$("$Closing socket...

$")$;

CLOSESOCKET$($socket$\_$peer$)$;

#if defined$(\_$WIN$32)$

WSACleanup$()$;

#endif

printf$("$Finished$.$

$")$;

return $0$;

$\}$

Here is the server code:

#include $"$tcpSC$.$h$"$

#include

int main$()\{$

#if defined$(\_$WIN$32)$

WSADATA d;

if $($WSAStartup$($MAKEWORD$(2,2),$ &d$))\{$

fprintf$($stderr$,$ "Failed to initialize.

$")$;

return $1$;

$\}$

#endif

printf$("$Configuring local address...

$")$;

struct addrinfo hints;

memset$($&hints, $0,$ sizeof$($hints$))$;

hints.ai$\_$family $=$ AF$\_$INET;

hints.ai$\_$socktype $=$ SOCK$\_$STREAM;

hints.ai$\_$flags $=$ AI$\_$PASSIVE;

struct addrinfo $*$bind$\_$address;

getaddrinfo$(0,"8080",$ &hints, &bind$\_$address$)$;

printf$("$Creating socket...

$")$;

SOCKET socket$\_$listen;

socket$\_$listen $=$ socket$($bind$\_$address$->$ai$\_$family,

bind$\_$address$->$ai$\_$socktype, bind$\_$address$->$ai$\_$protocol$)$;

if $(!$ISVALIDSOCKET$($socket$\_$listen$))\{$

fprintf$($stderr$,$ "socket$()$ failed. $(\%$d$)$

$",$ GETSOCKETERRNO$())$;

return $1$;

$\}$

printf$("$Binding socket to local address...

$")$;

if $($bind$($socket$\_$listen,

bind$\_$address$->$ai$\_$addr, bind$\_$address$->$ai$\_$addrlen$))\{$

fprintf$($stderr$,$ "bind$()$ failed. $(\%$d$)$

$",$ GETSOCKETERRNO$())$;

return $1$;

$\}$

freeaddrinfo$($bind$\_$address$)$;

printf$("$Listening$...$

$")$;

if $($listen$($socket$\_$listen, $10)<0)\{$

fprintf$($stderr$,$ "listen$()$ failed. $(\%$d$)$

$",$ GETSOCKETERRNO$())$;

return $1$;

$\}$

fd$\_$set master;

FD$\_$ZERO$($&master$)$;

FD$\_$SET$($socket$\_$listen, &master$)$;

SOCKET max$\_$socket $=$ socket$\_$listen;

printf$("$Waiting for connections...

$")$;

while$(1)\{$

fd$\_$set reads;

reads $=$ master;

if $($select$($max$\_$socket$+1,$ &reads, $0,0,0)<0)\{$

fprintf$($stderr$,$ "select$()$ failed. $(\%$d$)$

$",$ GETSOCKETERRNO$())$;

return $1$;

$\}$

SOCKET i;

for$($i $=1$; i $<=$ max$\_$socket; $++$i$)\{$

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