| /* 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 |