105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
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/* gethostname emulation for SysV and POSIX.1.
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Copyright (C) 1992, 2003, 2006, 2008-2020 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* David MacKenzie <djm@gnu.ai.mit.edu>
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Windows port by Simon Josefsson <simon@josefsson.org> */
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#include <config.h>
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#if !(defined _WIN32 && !defined __CYGWIN__)
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/* Unix API. */
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/* Specification. */
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#include <unistd.h>
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#ifdef HAVE_UNAME
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# include <sys/utsname.h>
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#endif
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#include <string.h>
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/* Put up to LEN chars of the host name into NAME.
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Null terminate it if the name is shorter than LEN.
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Return 0 if ok, -1 if error. */
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#include <stddef.h>
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int
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gethostname (char *name, size_t len)
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{
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#ifdef HAVE_UNAME
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struct utsname uts;
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if (uname (&uts) == -1)
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return -1;
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if (len > sizeof (uts.nodename))
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{
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/* More space than we need is available. */
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name[sizeof (uts.nodename)] = '\0';
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len = sizeof (uts.nodename);
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}
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strncpy (name, uts.nodename, len);
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#else
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strcpy (name, ""); /* Hardcode your system name if you want. */
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#endif
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return 0;
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}
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#else
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/* Native Windows API. Which primitive to choose?
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- gethostname() requires linking with -lws2_32.
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- GetComputerName() does not return the right kind of hostname.
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- GetComputerNameEx(ComputerNameDnsHostname,...) returns the right hostname,
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but it is hard to use portably:
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- It requires defining _WIN32_WINNT to at least 0x0500.
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- With mingw, it also requires
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"#define GetComputerNameEx GetComputerNameExA".
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- With older versions of mingw, none of the declarations are present at
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all, not even of the enum value ComputerNameDnsHostname.
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So we use gethostname(). Linking with -lws2_32 is the least evil. */
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#define WIN32_LEAN_AND_MEAN
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/* Get winsock2.h. */
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#include <unistd.h>
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/* Get INT_MAX. */
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#include <limits.h>
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/* Get set_winsock_errno. */
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#include "w32sock.h"
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#include "sockets.h"
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#undef gethostname
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int
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rpl_gethostname (char *name, size_t len)
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{
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int r;
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if (len > INT_MAX)
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len = INT_MAX;
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gl_sockets_startup (SOCKETS_1_1);
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r = gethostname (name, (int) len);
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if (r < 0)
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set_winsock_errno ();
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return r;
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}
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#endif
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