Line data    Source code

       1             : /* netconn.c -- is a particular file descriptor a network connection?. */
       2             : 
       3             : /* Copyright (C) 2002-2005 Free Software Foundation, Inc.
       4             : 
       5             :    This file is part of GNU Bash, the Bourne Again SHell.
       6             : 
       7             :    Bash is free software: you can redistribute it and/or modify
       8             :    it under the terms of the GNU General Public License as published by
       9             :    the Free Software Foundation, either version 3 of the License, or
      10             :    (at your option) any later version.
      11             : 
      12             :    Bash is distributed in the hope that it will be useful,
      13             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      15             :    GNU General Public License for more details.
      16             : 
      17             :    You should have received a copy of the GNU General Public License
      18             :    along with Bash.  If not, see <http://www.gnu.org/licenses/>.
      19             : */
      20             : 
      21             : #include <config.h>
      22             : 
      23             : #include <bashtypes.h>
      24             : #if ! defined(_MINIX) && defined (HAVE_SYS_FILE_H)
      25             : #  include <sys/file.h>
      26             : #endif
      27             : #include <posixstat.h>
      28             : #include <filecntl.h>
      29             : 
      30             : #include <errno.h>
      31             : 
      32             : #if defined (HAVE_UNISTD_H)
      33             : #  include <unistd.h>
      34             : #endif
      35             : 
      36             : /* The second and subsequent conditions must match those used to decide
      37             :    whether or not to call getpeername() in isnetconn(). */
      38             : #if defined (HAVE_SYS_SOCKET_H) && defined (HAVE_GETPEERNAME) && !defined (SVR4_2)
      39             : #  include <sys/socket.h>
      40             : #endif
      41             : 
      42             : /* Is FD a socket or network connection? */
      43             : int
      44           0 : isnetconn (fd)
      45             :      int fd;
      46             : {
      47             : #if defined (HAVE_SYS_SOCKET_H) && defined (HAVE_GETPEERNAME) && !defined (SVR4_2) && !defined (__BEOS__)
      48           0 :   int rv;
      49           0 :   socklen_t l;
      50           0 :   struct sockaddr sa;
      51             : 
      52           0 :   l = sizeof(sa);
      53           0 :   rv = getpeername(fd, &sa, &l);
      54             :   /* Posix.2 says getpeername can return these errors. */
      55           0 :   return ((rv < 0 && (errno == ENOTSOCK || errno == ENOTCONN || errno == EINVAL || errno == EBADF)) ? 0 : 1);
      56             : #else /* !HAVE_GETPEERNAME || SVR4_2 || __BEOS__ */
      57             : #  if defined (SVR4) || defined (SVR4_2)
      58             :   /* Sockets on SVR4 and SVR4.2 are character special (streams) devices. */
      59             :   struct stat sb;
      60             : 
      61             :   if (isatty (fd))
      62             :     return (0);
      63             :   if (fstat (fd, &sb) < 0)
      64             :     return (0);
      65             : #    if defined (S_ISFIFO)
      66             :   if (S_ISFIFO (sb.st_mode))
      67             :     return (0);
      68             : #    endif /* S_ISFIFO */
      69             :   return (S_ISCHR (sb.st_mode));
      70             : #  else /* !SVR4 && !SVR4_2 */
      71             : #    if defined (S_ISSOCK) && !defined (__BEOS__)
      72             :   struct stat sb;
      73             : 
      74             :   if (fstat (fd, &sb) < 0)
      75             :     return (0);
      76             :   return (S_ISSOCK (sb.st_mode));
      77             : #    else /* !S_ISSOCK || __BEOS__ */
      78             :   return (0);
      79             : #    endif /* !S_ISSOCK || __BEOS__ */
      80             : #  endif /* !SVR4 && !SVR4_2 */
      81             : #endif /* !HAVE_GETPEERNAME || SVR4_2 || __BEOS__ */
      82             : }