mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-05 21:00:05 +00:00
1d863dc0b4
1999-06-30 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/gethostid.c: Handle failing call to getxxbyYY_r functions correctly for non-existing entry. * sunrpc/getrpcport.c: Likewise. * sunrpc/clnt_simp.c: Likewise. * inet/rexec.c: Likewise. * sunrpc/clnt_gen.c: Likewise. * inet/rcmd.c: Likewise. * sysdeps/generic/glob.c: Likewise.
114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
/* Copyright (C) 1995, 1996, 1998, 1999 Free Software Foundation, Inc.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include <alloca.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <netdb.h>
|
|
|
|
#define HOSTIDFILE "/var/adm/hostid"
|
|
|
|
#ifdef SET_PROCEDURE
|
|
int
|
|
sethostid (id)
|
|
long int id;
|
|
{
|
|
int fd;
|
|
ssize_t written;
|
|
|
|
/* Test for appropriate rights to set host ID. */
|
|
if (__libc_enable_secure)
|
|
{
|
|
__set_errno (EPERM);
|
|
return -1;
|
|
}
|
|
|
|
/* Open file for writing. Everybody is allowed to read this file. */
|
|
fd = __open (HOSTIDFILE, O_CREAT|O_WRONLY, 0644);
|
|
if (fd < 0)
|
|
return -1;
|
|
|
|
written = __write (fd, &id, sizeof (id));
|
|
|
|
__close (fd);
|
|
|
|
return written != sizeof (id) ? -1 : 0;
|
|
}
|
|
|
|
#else
|
|
# include <string.h>
|
|
# include <sys/param.h>
|
|
# include <resolv/netdb.h>
|
|
# include <netinet/in.h>
|
|
|
|
long int
|
|
gethostid ()
|
|
{
|
|
char hostname[MAXHOSTNAMELEN + 1];
|
|
size_t buflen;
|
|
char *buffer;
|
|
struct hostent hostbuf, *hp;
|
|
unsigned long int id;
|
|
struct in_addr in;
|
|
int herr;
|
|
int fd;
|
|
|
|
/* First try to get the ID from a former invocation of sethostid. */
|
|
fd = __open (HOSTIDFILE, O_RDONLY);
|
|
if (fd >= 0)
|
|
{
|
|
ssize_t n = __read (fd, &id, sizeof (id));
|
|
|
|
__close (fd);
|
|
|
|
if (n == sizeof (id))
|
|
return id;
|
|
}
|
|
|
|
/* Getting from the file was not successful. An intelligent guess for
|
|
a unique number of a host is its IP address. Return this. */
|
|
if (__gethostname (hostname, MAXHOSTNAMELEN) < 0 || hostname[0] == '\0')
|
|
/* This also fails. Return and arbitrary value. */
|
|
return 0;
|
|
|
|
buflen = 1024;
|
|
buffer = __alloca (buflen);
|
|
|
|
/* To get the IP address we need to know the host name. */
|
|
while (__gethostbyname_r (hostname, &hostbuf, buffer, buflen, &hp, &herr)
|
|
!= 0
|
|
|| hp == NULL)
|
|
if (herr != NETDB_INTERNAL || errno != ERANGE)
|
|
return 0;
|
|
else
|
|
{
|
|
/* Enlarge buffer. */
|
|
buflen *= 2;
|
|
buffer = __alloca (buflen);
|
|
}
|
|
|
|
in.s_addr = 0;
|
|
memcpy (&in, hp->h_addr,
|
|
(int) sizeof (in) < hp->h_length ? sizeof (in) : hp->h_length);
|
|
|
|
/* For the return value to be not exactly the IP address we do some
|
|
bit fiddling. */
|
|
return in.s_addr << 16 | in.s_addr >> 16;
|
|
}
|
|
#endif
|