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/*
Reader/writer to TCP/IP socket
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <stdio.h>
#include <errno.h>
char *name;
int sock;
char *GetLine();
int Connect();
main(argc,argv)
int argc;
char *argv[];
{
struct sockaddr_in addr;
int addrlen;
char *p;
char buff[1024];
int len;
name=argv[0];
if (argc<3)
{
fprintf(stderr,"%s: usage %s host port [nowrite]\n",name,name);
exit(1);
}
Connect(argv[1],atoi(argv[2]));
/* Test to see how to get the connected local port number
*/
addrlen=sizeof(addr);
if (getsockname(sock,&addr,&addrlen)!=0)
perror(name);
printf("%s: bound through port %d\n",name,ntohs(addr.sin_port));
while((argc==4)||(p=GetLine()))
{
if ((argc!=4)&&(write(sock,p,strlen(p))==-1))
{
perror(name);
close(sock);
exit(1);
}
if ((len=read(sock,buff,1024))<=0)
{
perror(name);
close(sock);
exit(1);
}
buff[len]=0;
printf("%s\n",buff);
}
close(sock);
printf("\n");
return(0);
}
char *GetLine()
{
static char buff[1024];
int l;
if (feof(stdin))
return(NULL);
printf("> ");
if (!gets(buff))
return(NULL);
l=strlen(buff);
if (buff[l-1]=='\n')
buff[l-1]=0;
if (strlen(buff))
return(buff);
else
return(GetLine());
}
int Connect(n,p)
char *n;
int p;
{
struct hostent *remote;
struct sockaddr_in addr;
if (!(remote=gethostbyname(n)))
{
fprintf(stderr,"%s: unknown host %s\n",name,n);
exit(1);
}
bcopy(remote->h_addr,&addr.sin_addr,remote->h_length);
if ((sock=socket(AF_INET,SOCK_STREAM,0))==-1)
{
perror(name);
exit(1);
}
addr.sin_family=AF_INET;
addr.sin_port=htons(p);
if (connect(sock,&addr,sizeof(addr))==-1)
{
perror(name);
exit(1);
}
}
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