(no subject)

[Amod Vaidya]

hi! all, 

here is a program that i am wirting to access URL's from c program
it is connecting to the IP address that I am giviing but not getting 
any data from it.

It is also not working with URL's , that means i am not able to 
give "www.xxxxx" type of things here can any one please suggest any way 
for me any modification to be specific, I will be glad to accept any 
suggestion from you,

with regards,
Sudipto.


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here is the programe that I am writing.


#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#define SERVER_PORT 80
#define SERV_HOST_ADDR "203.163.50.62"
int readline(int fd, char *ptr,int maxlen)
{
        int n,rc;
        char c;

        for(n=1;n<maxlen;n++)
        {
                if ( (rc = read (fd,&c,1)) == 1 )
                {
                        *ptr++=c;
                        if ( c =='\n') break;
                } else if  ( rc ==0 ) {
                                if ( n==1) return(0);
                                else break;     
                        } else return(-1);
                
        }
        *ptr = 0;
        return(n);
}


int writen(int fd, char * ptr,int nbytes)
{
        int nleft, nwritten;

        nleft = nbytes;
        while (nleft > 0)
        {
                nwritten = write (fd, ptr, nleft);
                if ( nwritten <= 0 ) return(nwritten);
                nleft -= nwritten;
                ptr += nwritten;
        }
        return(nbytes - nleft);
}

int str_cli(fp,sockfd)
FILE *fp;
int sockfd;
{
        int n;
        char sendline[80], recvline[81];

        while(fgets(sendline, 80,fp) != NULL )
        {
                n = strlen(sendline);
                if (writen(sockfd,sendline,n) != n )
                printf("written error on socket\n");
                
                n = readline(sockfd,recvline,80);
                if ( n<0) printf("readline error\n");
                recvline[n] = 0;
                fputs(recvline,stdout);
        }
        if (ferror(fp)) printf("error reading file\n");

}
int main(int argc, char *argv[])
{
        int sd;
        struct sockaddr_in serv_addr;


        
        
        bzero((char *) &serv_addr, sizeof(serv_addr));

        serv_addr.sin_family = AF_INET;
        serv_addr.sin_addr.s_addr = inet_addr(SERV_HOST_ADDR);
        serv_addr.sin_port = htons(SERVER_PORT);

        sd = socket(AF_INET, SOCK_STREAM,0 );
        
        if ( sd < 0 )
        {
                 printf("cannot open the socket");
                 exit(1);
        }

        if (connect(sd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0 )
        printf("cannot be connected\n");
        else {
                printf("connection established");
        }       
        str_cli(stdin,sd);
        close(sd);

        exit(0);

}