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/*
Query remote host for TCP/IP socket
*/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
static const char *name;
static int Connect(const 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(EXIT_FAILURE);
}
memcpy(&addr.sin_addr, remote->h_addr, remote->h_length);
init=1;
}
if ((sock=socket(AF_INET,SOCK_STREAM,0))==-1)
{
perror(name);
exit(EXIT_FAILURE);
}
addr.sin_family=AF_INET;
addr.sin_port=htons(p);
if (connect(sock, (void *)&addr, sizeof(addr))!=-1)
{
printf("%s:%d\n",n,p);
}
close(sock);
}
int main(int argc, char *argv[])
{
int f;
name=argv[0];
if (argc<2)
{
fprintf(stderr,"%s: usage %s host\n",name,name);
exit(EXIT_FAILURE);
}
setbuf(stdout,NULL);
for(f=1;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 EXIT_SUCCESS;
}
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