NPM- 2nd ex

2nd ex:-

PROGRAM:

SERVER:

#include<stdio.h>

#include<netinet/in.h>

#include<sys/types.h>

#include<arpa/inet.h>

#define MAXLINE 10

int main(int argc,char **argv)

{

void strecho(int);

int sockfd,connfd,bfd,lfd;

pid_t childpid;

socklen_t clilen;

struct sockaddr_in servaddr,cliaddr;

sockfd=socket(AF_INET,SOCK_STREAM,0);

if(sockfd<0)

perror("socket not created");

else

printf("created socket %d\n",sockfd);

bzero(&servaddr,sizeof(servaddr));

servaddr.sin_port=htons(6092);

servaddr.sin_addr.s_addr=htonl(INADDR_ANY);

bfd=bind(sockfd,(const struct sockaddr *)&servaddr,sizeof(servaddr));

if(bfd<0)

printf("notbound successful %d\n",bfd);

else

printf("binding %d\n",bfd);

lfd=listen(sockfd,5);

printf("listening %d\n",lfd);

for(;;)

{

connfd=-1;

clilen=sizeof(cliaddr);

connfd=accept(sockfd,(struct sockaddr *)&cliaddr,&clilen);

if(connfd<0)

printf("not connected%d\n",connfd);

else

printf("connection socket %d\n",connfd);

if((childpid=fork())==0)

{

close(sockfd);

strecho(connfd);

exit(0);

}

close(connfd);

}

}

void strecho(int sockfd)

{

ssize_t n;

char line[MAXLINE];

for(;;)

{

n=recv(sockfd,line,MAXLINE,0);

printf("bytes received %d\n",n);

if(n>0)

{

send(sockfd,line,n,0);

printf("bytes sent %d\n",n);

}

else

close(sockfd);

}

}

 CLIENT:

#include<stdio.h>

#include<sys/types.h>

#include<netinet/in.h>

#include<arpa/inet.h>

#define MAXLINE 100

void strclient(FILE *fp,int sockfd);

int main(int argc,char **argv)

{

int sockfd,connfd,n;

struct sockaddr_in servaddr;

if(argc!=3)

printf("arg error");

sockfd=socket(AF_INET,SOCK_STREAM,0);

printf("socket description %d\n",sockfd);

bzero(&servaddr,sizeof(servaddr));

servaddr.sin_family=AF_INET;

servaddr.sin_port=htons(atoi(argv[2]));

inet_pton(AF_INET,argv[1],&servaddr.sin_addr);

connfd=connect(sockfd,(const struct sockaddr *)&servaddr,sizeof(servaddr)

);

if(connfd<0)

printf("connected socket %d",connfd);

strclient(stdin,sockfd);

exit(0);

}

void strclient(FILE *fp,int sockfd)

{

int n;

char sendline[MAXLINE],recvline[MAXLINE];

while(fgets(sendline,MAXLINE,fp)!=NULL)

{

if(strcmp(sendline,"exit/n")==0)

{

close(sockfd);

exit(0);

}

else

{

n=send(sockfd,sendline,strlen(sendline),0);

printf("bytes sent %d\n",n);

if(recv(sockfd,recvline,MAXLINE,0)==0)

printf("service terminated");

recvline[n]='\0';

fputs(recvline,stdout);

}

}

}

OUTPUT:

server output:

[it86091@vecit ~]$ cc program2a.c

[it86091@vecit ~]$ ./a.out

created socket 3

binding :0

listening :0

connected socket 4

bytes received 3

bytes sent 3

client:

[it86091@vecit ~]$ cc program2b.c

[it86091@vecit ~]$ ./a.out 172.16.6.4 6092

socket description 3

hi

bytes sent 3

hi