| 1 | /* netconn.c -- is a particular file descriptor a network connection?. */
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| 2 |
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| 3 | /* Copyright (C) 2002-2005 Free Software Foundation, Inc.
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| 4 |
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| 5 | This file is part of GNU Bash, the Bourne Again SHell.
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| 6 |
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| 7 | Bash is free software; you can redistribute it and/or modify it
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| 8 | under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 2, or (at your option)
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| 10 | any later version.
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| 11 |
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| 12 | Bash is distributed in the hope that it will be useful, but WITHOUT
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| 13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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| 14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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| 15 | License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with Bash; see the file COPYING. If not, write to the Free
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| 19 | Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
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| 20 | */
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| 21 |
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| 22 | #include <config.h>
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| 23 |
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| 24 | #include <bashtypes.h>
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| 25 | #if ! defined(_MINIX) && defined (HAVE_SYS_FILE_H)
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| 26 | # include <sys/file.h>
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| 27 | #endif
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| 28 | #include <posixstat.h>
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| 29 | #include <filecntl.h>
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| 30 |
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| 31 | #include <errno.h>
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| 32 |
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| 33 | #if defined (HAVE_UNISTD_H)
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| 34 | # include <unistd.h>
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| 35 | #endif
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| 36 |
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| 37 | /* The second and subsequent conditions must match those used to decide
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| 38 | whether or not to call getpeername() in isnetconn(). */
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| 39 | #if defined (HAVE_SYS_SOCKET_H) && defined (HAVE_GETPEERNAME) && !defined (SVR4_2)
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| 40 | # include <sys/socket.h>
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| 41 | #endif
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| 42 |
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| 43 | /* Is FD a socket or network connection? */
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| 44 | int
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| 45 | isnetconn (fd)
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| 46 | int fd;
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| 47 | {
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| 48 | #if defined (HAVE_GETPEERNAME) && !defined (SVR4_2) && !defined (__BEOS__)
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| 49 | int rv;
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| 50 | socklen_t l;
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| 51 | struct sockaddr sa;
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| 52 |
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| 53 | l = sizeof(sa);
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| 54 | rv = getpeername(fd, &sa, &l);
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| 55 | /* Posix.2 says getpeername can return these errors. */
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| 56 | return ((rv < 0 && (errno == ENOTSOCK || errno == ENOTCONN || errno == EINVAL)) ? 0 : 1);
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| 57 | #else /* !HAVE_GETPEERNAME || SVR4_2 || __BEOS__ */
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| 58 | # if defined (SVR4) || defined (SVR4_2)
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| 59 | /* Sockets on SVR4 and SVR4.2 are character special (streams) devices. */
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| 60 | struct stat sb;
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| 61 |
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| 62 | if (isatty (fd))
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| 63 | return (0);
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| 64 | if (fstat (fd, &sb) < 0)
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| 65 | return (0);
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| 66 | # if defined (S_ISFIFO)
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| 67 | if (S_ISFIFO (sb.st_mode))
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| 68 | return (0);
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| 69 | # endif /* S_ISFIFO */
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| 70 | return (S_ISCHR (sb.st_mode));
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| 71 | # else /* !SVR4 && !SVR4_2 */
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| 72 | # if defined (S_ISSOCK) && !defined (__BEOS__)
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| 73 | struct stat sb;
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| 74 |
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| 75 | if (fstat (fd, &sb) < 0)
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| 76 | return (0);
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| 77 | return (S_ISSOCK (sb.st_mode));
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| 78 | # else /* !S_ISSOCK || __BEOS__ */
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| 79 | return (0);
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| 80 | # endif /* !S_ISSOCK || __BEOS__ */
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| 81 | # endif /* !SVR4 && !SVR4_2 */
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| 82 | #endif /* !HAVE_GETPEERNAME || SVR4_2 || __BEOS__ */
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| 83 | }
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