PRATICAL NO:10
Client.c
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<arpa/inet.h>
#include<sys/socket.h>
#define SERVER "127.0.0.1"
#define BUFLEN 503
#define PORT 8885
void die(char *s)// used to quit
{
perror(s);
exit(1);
}
unsigned long fsize(char* file)
{
FILE * f = fopen(file, "r");
fseek(f, 0, SEEK_END);//used to take the function pointer to the
starting of the file or end of the file or to any position specified by the
user.
unsigned long len = (unsigned long)ftell(f);// used to find out the
position of file pointer in the file with respect to starting of the file.
fclose(f);
return len;
}
int main(void)
{
struct sockaddr_in si_other;
int s, i, slen=sizeof(si_other);
char buf[BUFLEN];
char message[BUFLEN];
if ( (s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
{
die("socket");
}
memset((char *) &si_other, 0, sizeof(si_other));
si_other.sin_family = AF_INET;
si_other.sin_port = htons(PORT);
if (inet_aton(SERVER , &si_other.sin_addr) == 0) //converts the
specified string, in the Internet standard dot notation, to a network
address, and stores the address in the structure provided.
{
fprintf(stderr, "inet_aton() failed\n");
exit(1);
}
char fname[20];
printf("Enter Filename with extension: ");
scanf("%s",&fname);//add.txt
sendto(s, fname, 20 , 0 , (struct sockaddr *) &si_other, slen);
memset(message,0,503);
unsigned long siz = fsize(fname);//fsize(add.txt)=20
printf("%ld",(siz % 503));//20%503=20
char str[10];
sprintf(str, "%d", siz);
sendto(s, str, 20 , 0 , (struct sockaddr *) &si_other, slen);
FILE *f;
f=fopen(fname,"rb");
memset(message,0,503);
fread(message, 503,1,f);
int itr =1;
while(itr*503<siz)
{
//fread(message, 503,1,f);
if (sendto(s, message, 503 , 0 , (struct sockaddr *) &si_other, slen)==-
1)
{
die("sendto()");
}
memset(message,0,503);
fread(message, 503,1,f);
itr++;
}
fread(message, (siz % 503),1,f);
sendto(s, message, (siz % 503) , 0 , (struct sockaddr *) &si_other, slen);
memset(message,0,503);
fclose(f);
close(s);
return 0;
}
Server.c
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<arpa/inet.h>
#include<sys/socket.h>
#define BUFLEN 503
#define PORT 8885
void die(char *s)
{
perror(s);
exit(1);
}
int main(void)
{
struct sockaddr_in si_me, si_other;
int s, i,j, slen = sizeof(si_other) , recv_len;
char buf[BUFLEN];
if ((s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
{
die("socket");
}
memset((char *) &si_me, 0, sizeof(si_me));
si_me.sin_family = AF_INET;
si_me.sin_port = htons(PORT);
si_me.sin_addr.s_addr = htonl(INADDR_ANY);
if( bind(s , (struct sockaddr*)&si_me, sizeof(si_me) ) == -1)
{
die("bind");
}
char fname[20];
FILE *fp;
recv_len = recvfrom(s, buf, 20, 0, (struct sockaddr *) &si_other, &slen);
char fna[100];
memset(buf,0,503);
recv_len = recvfrom(s, buf, 20, 0, (struct sockaddr *) &si_other, &slen);
strcpy(fna,buf);
int len= strlen(fna);
printf("%d",len);//20
for(j=len-1;j>=0;j--)
{
if(fna[j]=='.')
{
fna[j-1]='1';
}
}
unsigned long mm = atoi(buf);
fp=fopen(fna,"wb");
int itr=1;
memset(buf,0,503);
while(itr*503<mm)
{
if ((recv_len = recvfrom(s, buf, 503, 0, (struct sockaddr *) &si_other,
&slen)) == -1)
{
die("recvfrom()");
}
fwrite(buf,503, 1, fp);
memset(buf,0,503);
itr++;
}
printf("%d",(mm%503));
recv_len = recvfrom(s, buf, (mm%503), 0, (struct sockaddr *) &si_other,
&slen);
fwrite(buf,(mm%503), 1, fp);
memset(buf,0,503);
fclose(fp);
close(s);
return 0;
}
