79 lines
3.7 KiB
C
79 lines
3.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ 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; version 2 of the License. │
|
|
│ │
|
|
│ 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, write to the Free Software │
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
|
│ 02110-1301 USA │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/calls/internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/nt/winsock.h"
|
|
#include "libc/sock/internal.h"
|
|
#include "libc/sock/sock.h"
|
|
#include "libc/sysv/consts/so.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
static bool setsockopt_polyfill(int *optname) {
|
|
if (errno == ENOPROTOOPT && *optname == SO_REUSEPORT /* RHEL5 */) {
|
|
*optname = SO_REUSEADDR; /* close enough */
|
|
return true; /* fudges errno */
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static textwindows int setsockopt$nt(struct Fd *fd, int level, int optname,
|
|
const void *optval, uint32_t optlen) {
|
|
if (__setsockopt$nt(fd->handle, level, optname, optval, optlen) != -1) {
|
|
return 0;
|
|
} else {
|
|
return winsockerr();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Modifies socket settings.
|
|
*
|
|
* This function is the ultimate rabbit hole. Basic usage:
|
|
*
|
|
* int yes = 1;
|
|
* setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &yes, sizeof(yes));
|
|
*
|
|
* @param level can be SOL_SOCKET, SOL_IP, SOL_TCP, etc.
|
|
* @param optname can be SO_{REUSE{PORT,ADDR},KEEPALIVE,etc.} etc.
|
|
* @return 0 on success, or -1 w/ errno
|
|
* @error ENOPROTOOPT for unknown (level,optname)
|
|
* @see libc/sysv/consts.sh for tuning catalogue
|
|
* @see getsockopt()
|
|
*/
|
|
int setsockopt(int fd, int level, int optname, const void *optval,
|
|
uint32_t optlen) {
|
|
if (!optval) return efault();
|
|
if (!level || !optname) return enoprotoopt(); /* our sysvconsts definition */
|
|
if (optname == -1) return 0; /* our sysvconsts definition */
|
|
if (!IsWindows()) {
|
|
do {
|
|
if (setsockopt$sysv(fd, level, optname, optval, optlen) != -1) {
|
|
return 0;
|
|
}
|
|
} while (setsockopt_polyfill(&optname));
|
|
return -1;
|
|
} else if (isfdkind(fd, kFdSocket)) {
|
|
return setsockopt$nt(&g_fds.p[fd], level, optname, optval, optlen);
|
|
} else {
|
|
return ebadf();
|
|
}
|
|
}
|