D. TCP File Transfer Socket Programming in Unix Using C Programming

FILE TRANSFER SERVER USING TCP

/*FILE TRANSFER SERVER USING TCP IN C*/
#include<netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include<stdio.h>
#include <arpa/inet.h>
#include <string.h>
#include<fcntl.h>
main() {
 int sd, cd;
 char buf[1000] = "", fname[10];
 struct sockaddr_in ser;
 sd = socket(AF_INET, SOCK_STREAM, 0);
 if (sd < 0)
   printf("SOCKET NOT CREATED\n");
 bzero(&ser, sizeof (struct sockaddr_in));
 ser.sin_family = AF_INET;
 ser.sin_port = htons(1101);
 inet_aton("localhost", &ser.sin_addr);
 int b = bind(sd, (struct sockaddr *) &ser, sizeof (ser));
 printf("BIND VALUE:%d\n", b);
 listen(sd, 5);
 for (;;) {
   cd = accept(sd, NULL, NULL);
   int pid = fork();
   if (pid == 0) {
    printf("accept value %d\n", cd);
    read(cd, buf, 1000);
    int fd = open(buf, O_RDONLY);
    read(fd, buf, 1000);
    write(cd, buf, strlen(buf));
    printf("MESSAGE FROM CLIENT:%s\n", buf);
    close(cd);
   }
 }
 close(sd);
}

FILE TRANSFER CLIENT USING TCP

/*FILE TRANSFER CLIENT USING TCP IN C*/

#include<netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include<stdio.h>
#include <arpa/inet.h>
#include <string.h>
#include<fcntl.h>
main() {
 int sd, cd;
 char buf[1000] = "", buf1[1000] = "";
 struct sockaddr_in ser;
 sd = socket(AF_INET, SOCK_STREAM, 0);
 if (sd < 0)
   printf("SOCKET NOT CREATED\n");
 bzero(&ser, sizeof (struct sockaddr_in));
 ser.sin_family = AF_INET;
 ser.sin_port = htons(1101);
 inet_aton("localhost", &ser.sin_addr);
 connect(sd, (struct sockaddr *) &ser, sizeof (ser));
 for (;;) {
   printf("ENTER THE MESSAGE");
   scanf("%s", buf);
   write(sd, buf, strlen(buf));
   read(sd, buf, 1000);
   printf("RECEIVED FROM SERVER%s\n", buf);
 }
 close(sd);
}

Sample Server Output:

cc udp.c - o udp
. / udp
BIND VALUE : 0
accept value 4
MESSAGE FROM CLIENT :
#include<stdio.h>
main() {
 printf("hello");
}

Sample Client Output:

cc ftclient.c - o ftcli
. / ftcli
ENTER THE MESSAGE
hello.c
RECEIVED FROM SERVER
#include<stdio.h>
main() {
 printf("hello");
}