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10.12.2008 at 10:57AM PDT, ID: 23807924
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6.8

c socket programming : file transfer problem

Asked by dtivmk in Unix Systems Programming, Unix Networking, TCP/IP

Hi,
In the attached server.c and client.c code snippets, if I don't use
bzero,
then,
at the client side, some extra/strange characters appear at the end
of client.txt.

I want to know why?
server.txt is as simple as this :
----file beginning---
abcd
---file end---
All I am trying to do here is to transfer server.txt, from server to client.txt
at the client.Start Free Trial 
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server.c :
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>  
#include <arpa/inet.h>
#include <stdio.h>
 
#define PORT 2080
 
main()
{
	int sock1,sock2, clength;
	sock1 =  socket(AF_INET,SOCK_STREAM,0);
	struct sockaddr_in serv,cli;
 
	serv.sin_family = AF_INET;
	serv.sin_port = htons(PORT);
	serv.sin_addr.s_addr = inet_addr("127.0.0.1");
	bind(sock1,(struct sockaddr *)&serv, sizeof(serv));
	listen(sock1,5);
	clength = sizeof(cli);
	int i=0;
	char buf[50];
	sock2 = accept(sock1,(struct sockaddr *)&cli,&clength);
	printf("\n Client Connected\n");
	FILE* fp = fopen("server.txt","r");
	while(!feof(fp)){
		//bzero(buf,sizeof(buf));
		fread(buf,sizeof(char),50,fp);
		write(sock2,buf,50);
	}
	write(sock2,"quit1234",50);
	fclose(fp);
	return 0;
}
 
client.c :
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>  
#include <arpa/inet.h>
#include <stdio.h>
 
#define PORT 2080
 
main()
{
	int sock1;
	sock1 =  socket(AF_INET,SOCK_STREAM,0);
	struct sockaddr_in serv;
 
	serv.sin_port = htons(PORT);
	printf("%x %x\n",PORT,htons(PORT));
	serv.sin_family = AF_INET;
	serv.sin_addr.s_addr = inet_addr("127.0.0.1");
	printf("client connecting\n");
	connect(sock1, (struct sockaddr *)&serv,sizeof(serv));
	char buf[50];
	FILE* fp = fopen("client.txt","w");
	while(1){
		//bzero(buf,sizeof(buf));
		read(sock1,buf,50);
		if(strcmp(buf,"quit1234")==0)
		{
			break;	
		}
		fprintf(fp,"%s",buf);
	}
	fclose(fp);
}
[+][-]10.12.2008 at 12:13PM PDT, ID: 22698507

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[+][-]10.12.2008 at 12:49PM PDT, ID: 22698618

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[+][-]10.12.2008 at 01:37PM PDT, ID: 22698776

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[+][-]10.16.2008 at 04:03AM PDT, ID: 22729548

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[+][-]10.16.2008 at 04:15AM PDT, ID: 22729610

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[+][-]10.16.2008 at 09:30AM PDT, ID: 22732969

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[+][-]10.16.2008 at 12:17PM PDT, ID: 22734742

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About this solution

Zones: Unix Systems Programming, Unix Networking, TCP/IP
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Solution Provided By: sweetfa2
Participating Experts: 1
Solution Grade: A
 
 
[+][-]10.16.2008 at 09:06PM PDT, ID: 22737706

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[+][-]10.16.2008 at 09:25PM PDT, ID: 22737769

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[+][-]10.17.2008 at 09:04PM PDT, ID: 22747006

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