105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/* gethostname emulation for SysV and POSIX.1.
|
|
|
|
Copyright (C) 1992, 2003, 2006, 2008-2020 Free Software Foundation, Inc.
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
/* David MacKenzie <djm@gnu.ai.mit.edu>
|
|
Windows port by Simon Josefsson <simon@josefsson.org> */
|
|
|
|
#include <config.h>
|
|
|
|
#if !(defined _WIN32 && !defined __CYGWIN__)
|
|
/* Unix API. */
|
|
|
|
/* Specification. */
|
|
#include <unistd.h>
|
|
|
|
#ifdef HAVE_UNAME
|
|
# include <sys/utsname.h>
|
|
#endif
|
|
|
|
#include <string.h>
|
|
|
|
/* Put up to LEN chars of the host name into NAME.
|
|
Null terminate it if the name is shorter than LEN.
|
|
Return 0 if ok, -1 if error. */
|
|
|
|
#include <stddef.h>
|
|
|
|
int
|
|
gethostname (char *name, size_t len)
|
|
{
|
|
#ifdef HAVE_UNAME
|
|
struct utsname uts;
|
|
|
|
if (uname (&uts) == -1)
|
|
return -1;
|
|
if (len > sizeof (uts.nodename))
|
|
{
|
|
/* More space than we need is available. */
|
|
name[sizeof (uts.nodename)] = '\0';
|
|
len = sizeof (uts.nodename);
|
|
}
|
|
strncpy (name, uts.nodename, len);
|
|
#else
|
|
strcpy (name, ""); /* Hardcode your system name if you want. */
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
/* Native Windows API. Which primitive to choose?
|
|
- gethostname() requires linking with -lws2_32.
|
|
- GetComputerName() does not return the right kind of hostname.
|
|
- GetComputerNameEx(ComputerNameDnsHostname,...) returns the right hostname,
|
|
but it is hard to use portably:
|
|
- It requires defining _WIN32_WINNT to at least 0x0500.
|
|
- With mingw, it also requires
|
|
"#define GetComputerNameEx GetComputerNameExA".
|
|
- With older versions of mingw, none of the declarations are present at
|
|
all, not even of the enum value ComputerNameDnsHostname.
|
|
So we use gethostname(). Linking with -lws2_32 is the least evil. */
|
|
|
|
#define WIN32_LEAN_AND_MEAN
|
|
/* Get winsock2.h. */
|
|
#include <unistd.h>
|
|
|
|
/* Get INT_MAX. */
|
|
#include <limits.h>
|
|
|
|
/* Get set_winsock_errno. */
|
|
#include "w32sock.h"
|
|
|
|
#include "sockets.h"
|
|
|
|
#undef gethostname
|
|
|
|
int
|
|
rpl_gethostname (char *name, size_t len)
|
|
{
|
|
int r;
|
|
|
|
if (len > INT_MAX)
|
|
len = INT_MAX;
|
|
gl_sockets_startup (SOCKETS_1_1);
|
|
r = gethostname (name, (int) len);
|
|
if (r < 0)
|
|
set_winsock_errno ();
|
|
|
|
return r;
|
|
}
|
|
|
|
#endif
|