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KARTHICK NELLAI

FTP APPLICATION USING TCP

By karthick , in IMPLEMENTATION OF FTP APPLICATION USING TCP , 0 Comments

Server program

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

int main(int argc,char **argv[])

{

int sockfd,i,connfd,t,port;

char fname[50],cont[100];

FILE *f;

struct sockaddr_in servaddr;

if((sockfd=socket(AF_INET,SOCK_STREAM,0)) < 0)

{

printf("\n\t Error in socket Creation ");

exit(0);

}

printf("Enter the port number");

scanf("%d",&port);

bzero(&servaddr,sizeof(servaddr));

servaddr.sin_family=AF_INET;

servaddr.sin_port=htons(port);

servaddr.sin_addr.s_addr=htonl(INADDR_ANY);

if(bind(sockfd,(struct sockaddr *)&servaddr,sizeof(servaddr)) <0)

{

printf("\n\t Error in Bind"); exit(0);

}

if((listen(sockfd,10)) < 0)

{

printf("\n\t Error in Listen "); exit(0);

}

for(; ;)

{

if((connfd=accept(sockfd,(struct sockaddr*)NULL,NULL)) <0)

{

printf("\n\t Error in Accept" ); exit(0);

}

recv(connfd,fname,50,0);

printf("\n\t File is Received : %s \n",fname);

f=fopen(fname,"r");

while(!feof(f))

{

fread(cont,100,1,f);

if(!feof(f))

cont[t]='\0';

send(connfd,cont,strlen(cont),1);

}

printf("\n\t File Content Transferred \n");;

exit(0);

fclose(f);

close(connfd);

}

Client program

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

int main(int argc,char **argv[])

{

int sockfd,i,connfd,t,port;

char sfname[50],cont[100],dfname[50];

FILE *fp;

struct sockaddr_in servaddr;

if((sockfd=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP)) < 0)

{

printf("\n\t Error in socket Creation ");

exit(0);

}

printf("Enter the port number");

scanf("%d",&port);

bzero(&servaddr,sizeof(servaddr));

servaddr.sin_family=AF_INET;

servaddr.sin_port=htons(port);

servaddr.sin_addr.s_addr=htonl(INADDR_ANY);

if((connect(sockfd,(struct sockaddr *)&servaddr,sizeof(servaddr))))

{

printf("\n\t Error in Connect");

exit(0);

}

printf("\n\n\t Client Module has to run.....");

printf("\n\t Enter the Source FileName :");

scanf("%s",sfname);

printf("\n\t Enter the Destination FileName : ");

scanf("%s",dfname);

send(sockfd,sfname,strlen(sfname),0);

fp=fopen(dfname,"w");

while(recv(sockfd,cont,100,0) >0)

{

fwrite(&cont,strlen(cont),1,fp);

printf("%s\n",cont);

strcpy(cont,"\0");

}

fclose(fp);

close(sockfd);

}

OUTPUT

SERVER

[11ca013@mcalinux network]$ cc 6tcpftpser.c

[11ca013@mcalinux network]$ ./a.out 192.168.1.134

Enter the port number: 1052

File is Received: sample.txt

File Content Transferred

CLIENT

[11ca013@mcalinux network]$ cc 6tcpftpcli.c

[11ca013@mcalinux network]$ ./a.out 192.168.1.134

Enter the port number1052

Client Module has to run.....

Enter the Source FileName :sample.txt

Enter the Destination FileName : gandhi.txt

rajivgandhi

hi

how are you

ECHO APPLICATION USING UDP

By karthick , in IMPLEMENTATION OF ECHO APPLICATION USING UDP , 0 Comments

Server program

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

#include<unistd.h>

#include<netinet/in.h>

#include<arpa/inet.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<errno.h>

void dg_echo (int sockfd, struct sockaddr *pcliaddr, socklen_t clilen);

int main (int argc, char **argv)

{

int sockfd,port;

struct sockaddr_in servaddr, cliaddr;

sockfd = socket(AF_INET, SOCK_DGRAM, 0);

printf("Enter the port number : ");

scanf("%d",&port);

bzero (&servaddr, sizeof(servaddr));

servaddr.sin_family = AF_INET;

servaddr.sin_addr.s_addr = htonl(INADDR_ANY);

servaddr.sin_port = htons(port);

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

dg_echo(sockfd, (struct sockaddr *) &cliaddr, sizeof(cliaddr));

}

void dg_echo (int sockfd, struct sockaddr *pcliaddr, socklen_t clilen)

{

int n;

socklen_t len;

char mesg[1000];

len = clilen;

while(strcmp(mesg,"bye")!=0)

{

n = recvfrom (sockfd, mesg, 1000, 0, pcliaddr, &len);

printf("\nClient message :%s",mesg);

sendto (sockfd, mesg, n, 0, pcliaddr, len);

}

exit(0);

}

Client program

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

#include<unistd.h>

#include<netinet/in.h>

#include<arpa/inet.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<errno.h>

void dg_cli(FILE *fp,int sockfd,struct sockaddr_in *psa,socklen_t servlen);

int main (int argc, char **argv)

{

int sockfd,port;

struct sockaddr_in servaddr;

bzero (&servaddr, sizeof(servaddr));

printf("Enter the port number : ");

scanf("%d",&port);

servaddr.sin_family = AF_INET;

servaddr.sin_port = htons(port);

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

sockfd = socket(AF_INET, SOCK_DGRAM, 0);

dg_cli (stdin,sockfd,(struct sockaddr_in *)&servaddr,sizeof(servaddr));

exit(0);

}

void dg_cli(FILE *fp,int sockfd,struct sockaddr_in *psa,socklen_t servlen)

{

int n;

char sendline[1000], recvline[1000 + 1];

while(strcmp(recvline,"bye")!=0)

{

printf("\nEnter the message : ");

while (fgets (sendline, 1000, fp) != NULL)

{

sendto(sockfd,sendline,100,0,psa,servlen);

n = recvfrom(sockfd, recvline, 1000, 0, NULL, NULL);

recvline[n] = 0;

fputs (recvline, stdout);

}

exit(0);

}

OUTPUT

SERVER

[11ca013@mcalinux network]$ cc 5echoser.c

[11ca013@mcalinux network]$ ./a.out

Enter the port number : 3326

Client message :hi

Client message :hello

Client message :how_are_you

Client message :i_am_fine

Client message :ok_bye

CLIENT

[11ca013@mcalinux network]$ cc 5echocli.c

[11ca013@mcalinux network]$ ./a.out 192.168.1.134

Enter the port number : 3326

Enter the message

hi

hello

how_are_you

i_am_fine

ok_bye

ECHO APPLICATION USING TCP

By karthick , in IMPLEMENTATION OF ECHO APPLICATION USING TCP , 1 Comment

Server program

#include<stdio.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

#include<arpa/inet.h>

#include<stdlib.h>

#include<unistd.h>

#include<string.h>

#include<errno.h>

int main()

{

int sock,con,byte_rec,flag=0,port;

char send_data[1024],rec_data[1024];

struct sockaddr_in ser,cli;

int sin_size;

if((sock=socket(AF_INET,SOCK_STREAM,0))==-1)

{

perror("Socket\n");

exit(1);

}

ser.sin_family=AF_INET;

printf("Enter the port number : ");

scanf("%d",&port);

ser.sin_port=htons(port);

ser.sin_addr.s_addr=INADDR_ANY;

bzero(&(ser.sin_zero),8);

if(bind(sock,(struct sockaddr*)&ser,sizeof(struct sockaddr))==-1)

{

perror("can't bind\n");

exit(1);

}

if(listen(sock,3)==-1)

{

perror("listen\n");

exit(1);

}

printf("Waiting \n");

sin_size=sizeof(struct sockaddr_in);

con=accept(sock,(struct sockaddr*)&cli,&sin_size);

printf("Connected\n\n");

while(1)

{

byte_rec=recv(con,rec_data,1024,0);

rec_data[byte_rec]='\0';

printf("received data : %s\n\n",rec_data);

send(con,rec_data,strlen(rec_data),0);

if(strcmp(rec_data,"end")==0)

break;

}

close(con);

close(sock);

return 0;

}

Client program

#include<stdio.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

#include<arpa/inet.h>

#include<stdlib.h>

#include<unistd.h>

#include<string.h>

#include<netdb.h>

#include<errno.h>

int main()

{

int sock,byte_rec,port;

char send_data[1024],rec_data[1024];

struct hostent *host;

struct sockaddr_in ser,cli;

host=gethostbyname("127.0.0.1");

if((sock=socket(AF_INET,SOCK_STREAM,0))==-1)

{

perror("Socket\n");

exit(1);

}

printf("socket created\n");

ser.sin_family=AF_INET;

printf("Enter the port number : ");

scanf("%d",&port);

ser.sin_port=htons(port);

ser.sin_addr= *((struct in_addr *)host->h_addr);

bzero(&(ser.sin_zero),8);

if(connect(sock,(struct sockaddr*)&ser,sizeof(struct sockaddr))==-1)

{

perror("connect\n");

exit(1);

}

while(1)

{

printf("\nsend:");

scanf("%s",send_data);

send(sock,send_data,strlen(send_data),0);

byte_rec=recv(sock,rec_data,1024,0);

rec_data[byte_rec]='\0';

printf("Rec data : %s\n",rec_data);

if(strcmp(rec_data,"end")==0)

break;

}

close(sock);

return 0;

}

OUTPUT

SERVER

[11ca013@mcalinux network]$ cc 5tcpechoser.c

[11ca013@mcalinux network]$ ./a.out

Enter the port number : 3326

Waiting

Connected

received data : hi

received data : hello

received data : how_are_you

received data : i_am_fine

received data : end

[11ca013@mcalinux network]$

CLIENT

[11ca013@mcalinux network]$ cc 5tcpechocli.c

[11ca013@mcalinux network]$ ./a.out

socket created

Enter the port number : 3326

send:hi

Rec data : hi

send:hello

Rec data : hello

send:how_are_you

Rec data : how_are_you

send:i_am_fine

Rec data : i_am_fine

send:end

Rec data : end

[11ca013@mcalinux network]$

CHAT APPLICATION USING UDP

By karthick , in IMPLEMENTATION OF CHAT APPLICATION USING UDP , 0 Comments

Server program

#include<stdio.h>

#include<sys/socket.h>

#include<netdb.h>

#include<string.h>

#include<sys/types.h>

#include<netinet/in.h>

#include<arpa/inet.h>

#include<unistd.h>

#include<stdlib.h>

int main()

{

int listenfd,connfd,n,len,port;

char buff[1024], str[1024];

struct sockaddr_in servaddr;

listenfd=socket(AF_INET,SOCK_DGRAM,0);

if (listenfd<0)

printf("Unable to create a socket");

bzero(&servaddr,sizeof(servaddr));

servaddr.sin_family=AF_INET;

servaddr.sin_addr.s_addr=htonl (INADDR_ANY);

printf("Enter the port number");

scanf("%d",&port);

servaddr.sin_port=htons (port);

bind (listenfd,(struct sockaddr*)&servaddr,sizeof(servaddr));

len=sizeof(servaddr);

while(strcmp(buff,"bye")!=0)

{

recvfrom(listenfd,buff,1024,0,(struct sockaddr*)&servaddr,&len);

printf("From client :%s\n",buff);

printf("Server:");

scanf("%s",str);

write(listenfd,str,strlen(str));

sendto(listenfd,str,sizeof(str),0,(struct sockaddr*)&servaddr,len);

}

return 0;

}

Client program

#include<stdio.h>

#include<sys/socket.h>

#include<netdb.h>

#include<string.h>

#include<sys/types.h>

#include<netinet/in.h>

#include<arpa/inet.h>

#include<unistd.h>

#include<stdlib.h>

int main(int argc,char **argv)

{

int sockfd,n,len,port;

char buff[1024],str[1024];

struct sockaddr_in servaddr;

sockfd = socket(AF_INET,SOCK_DGRAM,0);

if (sockfd<0)

printf("Unable to create a socket");

bzero(&servaddr,sizeof(servaddr));

servaddr.sin_family=AF_INET;

servaddr.sin_addr.s_addr=htonl (INADDR_ANY);

//servaddr.sin_addr.s_addr=inet_addr(argv[1];

printf("Enter the port number");

scanf("%d",&port);

servaddr.sin_port=htons(port);

connect(sockfd,(struct sockaddr*)&servaddr,sizeof(servaddr));

while(strcmp(buff,"bye")!=0)

{

printf("client:");

//gets(str);

scanf("%s",str);

sendto(sockfd,str,sizeof(str),0,(struct sockaddr*)&servaddr,len);

write(sockfd,str,strlen(str));

printf("From Server:");

recvfrom(sockfd,buff,1024,0,(struct sockaddr*)&servaddr,&len);

fputs(buff,stdout);

printf("\n");

}

close(sockfd);

return 0;

}

OUTPUT

SERVER

[11ca013@mcalinux network]$ cc 4udpser.c

[11ca013@mcalinux network]$ ./a.out

Enter the port number4587

From client :hi

Server :how_are_you

From client :i_am_fine

Server :ok_where_are_you

From client :i_am_fine

Server :ok

From client :bye

CLIENT

[11ca013@mcalinux network]$ cc 4udpcli.c

[11ca013@mcalinux network]$ ./a.out

Enter the port number4587

Client :hi

From Server :how_are_you

Client :i_am_fine

From Server :ok

Client :bye

CHAT APPLICATION USING TCP

By karthick , in IMPLEMENTATION OF CHAT APPLICATION USING TCP , 0 Comments

Server program

#include<stdio.h>

#include<sys/socket.h>

#include<netdb.h>

#include<string.h>

#include<sys/types.h>

#include<netinet/in.h>

#include<arpa/inet.h>

#include<unistd.h>

#include<stdlib.h>

#define MAXDATASIZE 100

void main()

{

int sd,i=0,len,l,s,sd1,si,port;

struct sockaddr_in ser,cli;

char msg[20],rmsg[50];

char buf[MAXDATASIZE];

if((sd=socket(AF_INET,SOCK_STREAM,0))<0)

{

printf("\n\t Error in socket");

exit(0);

}

bzero(&ser,sizeof(ser));

ser.sin_family=AF_INET;

printf("\nEnter the port number : ");

scanf("%d",&port);

ser.sin_port=htons(port);

ser.sin_addr.s_addr=htonl(INADDR_ANY);

if(bind(sd,(struct sockaddr*)&ser,sizeof(ser)) <0)

{

printf("\n\t Error in bind");

exit(0);

}

if(listen(sd,5) <0)

{

printf("\n\t Error in Listen");

exit(0);

}

si=sizeof(cli);

if((sd1=accept(sd,(struct sockaddr*)&cli,&si)) <0)

{

printf("\n\t Error in Accept");

exit(0);

}

do

{

recv(sd1,msg,50,0);

printf("\n\t Clinet Msg Received : %s ",msg);

printf("\n\t Enter Server String : ");

gets(buf);

send(sd1,buf,50,0);

}

while((strcmp(buf,"exit"))!=0);

close(sd);

exit(0);

}

Client program

#include<stdio.h>

#include<sys/socket.h>

#include<netdb.h>

#include<string.h>

#include<sys/types.h>

#include<netinet/in.h>

#include<arpa/inet.h>

#include<unistd.h>

#include<stdlib.h>

#define MAXDATASIZE 100

void main()

{

int sd,i=0,len,port;

struct sockaddr_in ser;

char msg[20],rmsg[50];

char buf[MAXDATASIZE];

if((sd=socket(AF_INET,SOCK_STREAM,0))<0)

{

printf("\n\t Error in socket");

exit(0);

}

bzero(&ser,sizeof(ser));

ser.sin_family=AF_INET;

printf("\nEnter the port number : ");

scanf("%d",&port);

ser.sin_port=htons(port);

ser.sin_addr.s_addr=htonl(INADDR_ANY);

if(connect(sd,(struct sockaddr*)&ser,sizeof(ser)) <0)

{

printf("\n\t Error in bind");

exit(0);

}

do

{

printf("\n\t Enter the Client String :");

gets(buf);

send(sd,buf,50,0);

recv(sd,rmsg,50,0);

printf("\n\t Server Msg Received : %s ",rmsg);

}

while((strcmp(buf,"exit"))!=0);

close(sd);

}

OUTPUT

SERVER

[11ca013@mcalinux network]$ cc 4tcpser.c

[11ca013@mcalinux network]$ ./a.out

Enter the port number : 4585

Clinet Msg Received : hi

Enter Server String : how are you

Clinet Msg Received : i am fin

Enter Server String : ok

Clinet Msg Received : good night

Enter Server String : exit

CLIENT

[11ca013@mcalinux network]$ cc 4tcpcli.c

[11ca013@mcalinux network]$ ./a.out

Enter the port number : 4585

Enter the Client String :hi

Server Msg Received : how are you

Enter the Client String :i am fin

Server Msg Received : ok

Enter the Client String :good night

Server Msg Received : exit

KARTHICK's blog

KARTHICK NELLAI

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FTP APPLICATION USING TCP

ECHO APPLICATION USING UDP

ECHO APPLICATION USING TCP

CHAT APPLICATION USING UDP

CHAT APPLICATION USING TCP

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