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/*
Query remote host for 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 Connect();
main(argc,argv)
int argc;
char *argv[];
{
int f;
name=argv[0];
if (argc<2)
{
fprintf(stderr,"%s: usage %s host\n",name,name);
exit(1);
}
setbuf(stdout,NULL);
for(f=0;f<0x10000;f++)
{
if (argc>2)
printf("Trying %s:%d...\n",argv[1],f);
Connect(argv[1],f);
if ((argc==2)&&(f)&&((f%10000)==0))
fprintf(stderr,"Tried up to %s:%d\n",argv[1],f);
}
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;
{
static int init=0;
static struct hostent *remote;
static struct sockaddr_in addr;
int sock;
if (!init)
{
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);
init=1;
}
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)
printf("%s:%d\n",n,p);
close(sock);
}
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