id_query.c

Linux下的socks的程序源程序,用于socks的代理服务

/*
** id_query.c                             Transmit a query to an IDENT server
**
** Author: Peter Eriksson <[e-mail]>
*/

#include <stdio.h>
#include <errno.h>
#if defined(ISC)
#include <net/errno.h>
#endif /* #if defined(ISC) */
#include <signal.h>

#include <sys/types.h>
#if defined(ISC)
#include <sys/bsdtypes.h>
#endif /* #if defined(ISC) */
#include <sys/wait.h>
#include <sys/time.h>

#include "ident.h"


int id_query
#ifdef __STDC__
  (ident_t *id, int lport, int fport, struct timeval *timeout)
#else
  (id, lport, fport, timeout)
ident_t *id;
int lport;
int fport;
struct timeval *timeout;
#endif
{
#if defined(SOLARIS) || defined(_SEQUENT_)
  void (*old_sig)();
#else
  void *old_sig;
#endif
  int res;
  char buf[80];
  fd_set ws;
  
  sprintf(buf, "%d , %d\r\n", lport, fport);

  if (timeout)
  {
    FD_ZERO(&ws);
    FD_SET(id->fd, &ws);
    
    if ((res = select(FD_SETSIZE, (fd_set *)0, &ws, (fd_set *)0, timeout)) < 0)
      return -1;

    if (res == 0)
    {
      errno = ETIMEDOUT;
      return -1;
    }
  }

  old_sig = signal(SIGPIPE, SIG_IGN);
  
  res = write(id->fd, buf, strlen(buf));

  signal(SIGPIPE, old_sig);
  
  return res;
}