Answer Happy

PLEASE EXPLAIN LINES THAT NEEDS TO BE CHANGED TO FIT THE IPv6
REQUIREMENT
CLIENT CODE:
#include<string.h>
#include<stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#define SERVER_PORT 5432
#define MAX_LINE 256
int main(int argc, char * argv[]) {
FILE * fp;
struct hostent * hp;
struct sockaddr_in sin;
char * host;
char buf[MAX_LINE];
int s;
int len;
if (argc == 2) {
host = argv[1];
} else {
fprintf(stderr, "usage: simplex-talk
host\n");
exit(1);
}


/* translate host name into peer's IP address
*/
hp = gethostbyname(host);
if (!hp) {
fprintf(stderr, "simplex-talk: unknown
host: %s\n", host);
exit(1);
}

/* building address data structure */
bzero((char * ) & sin, sizeof(sin));
sin.sin_family = AF_INET;
bcopy(hp -> h_addr, (char * ) & sin.sin_addr,
hp -> h_length);
sin.sin_port = htons(SERVER_PORT);
/* active open */
if ((s = socket(PF_INET, SOCK_STREAM, 0)) < 0)
{
perror("simplex-talk: socket");
exit(1);
}
if (connect(s, (struct sockaddr * ) & sin,
sizeof(sin)) < 0) {
perror("simplex-talk: connect");
close(s);
exit(1);
}
/* main loop: get and send lines of text */
printf("Enter exit to Terminate the
connection\n");
while (1) {
bzero(buf,MAX_LINE); // clear
buffer
// get the input
printf("Enter Text Here >>>
");
fgets(buf, MAX_LINE, stdin); // get
input
buf[MAX_LINE - 1] = '\0';
len = strlen(buf) + 1;
// send(s, buf, len, 0); // send to
server
write(s,buf,len);
if(strncmp(buf,"exit",4) == 0)
return
0;
// fputs("Server: ",stdout);
// // clear buffer
// bzero(buf,MAX_LINE);
// // recieve from server
// recv(s, buf, MAX_LINE, 0);
// fputs(buf,stdout); // print
// if user enters exit; exit from
program
if(strncmp(buf,"exit",4) == 0)
return 0;
}
return 0;
}
SERVER CODE:
#include<string.h>
#include<stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#define SERVER_PORT 5432
#define MAX_PENDING 5
#define MAX_LINE 256
int main() {
struct sockaddr_in sin;
char buf[MAX_LINE];
int buf_len, addr_len;
int s, new_s;
FILE * file = fopen("serverlog.txt","w");


/* building address data structure */
bzero((char * ) & sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
sin.sin_port = htons(SERVER_PORT);
/* setup passive open */
if ((s = socket(PF_INET, SOCK_STREAM, 0)) < 0)
{
perror("simplex-talk: socket");
exit(1);
}
if ((bind(s, (struct sockaddr * ) & sin,
sizeof(sin))) < 0) {
perror("simplex-talk: bind");
exit(1);
}
listen(s, MAX_PENDING);
pid_t childpid;
int ctr = 1; // total number of connection

while (1) {
// accept new connection
if ((new_s = accept(s, (struct sockaddr
* ) & sin, & addr_len)) < 0) {
perror("simplex-talk:
accept");
exit(1);
}
if((childpid = fork()) == 0){
close(s);

/* wait for connection, then receive
and print text */
while (1){
// clear
buffer

bzero(buf,MAX_LINE);
// recieve
data and print
buf_len =
recv(new_s, buf, MAX_LINE, 0);

fputs("Clinet",file);

fprintf(file, "%d: ", new_s);
fputs(buf,
file);

if(strncmp(buf,"exit",4) == 0)

return 0;
//
printf(">>> ");
// // get
input
//
fgets(buf,MAX_LINE,stdin);
// // send
to client
//
write(new_s,buf,strlen(buf));
// // if
user sent exit; exit the program
//
if(strncmp(buf,"exit",4) == 0)
//
return 0;
}
close(new_s);
}
}
return 0;
}
2. What changes would be required to use IPv6 instead of IPv4? Demonstrate it in code. Make a list of all lines that need to be changed and give an example with a brief explanation.