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https://github.com/jart/cosmopolitan.git
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155b378a39
The organization of the source files is now much more rational. Old experiments that didn't work out are now deleted. Naming of things like files is now more intuitive.
96 lines
4.3 KiB
C
96 lines
4.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/errno.h"
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#include "libc/thread/thread.h"
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#include "libc/nt/enum/accessmask.h"
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#include "libc/nt/enum/fileflagandattributes.h"
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#include "libc/nt/enum/symboliclink.h"
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#include "libc/nt/enum/tokeninformationclass.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/files.h"
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#include "libc/nt/privilege.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/struct/luid.h"
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#include "libc/nt/struct/tokenprivileges.h"
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#include "libc/nt/thunk/msabi.h"
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#include "libc/sysv/errfuns.h"
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__msabi extern typeof(GetFileAttributes) *const __imp_GetFileAttributesW;
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static _Bool g_winlink_allowed;
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static pthread_once_t g_winlink_once;
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static textwindows void InitializeWinlink(void) {
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int64_t tok;
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struct NtLuid id;
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struct NtTokenPrivileges tp;
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if (!OpenProcessToken(GetCurrentProcess(), kNtTokenAllAccess, &tok)) return;
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if (!LookupPrivilegeValue(0, u"SeCreateSymbolicLinkPrivilege", &id)) return;
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tp.PrivilegeCount = 1;
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tp.Privileges[0].Luid = id;
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tp.Privileges[0].Attributes = kNtSePrivilegeEnabled;
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if (!AdjustTokenPrivileges(tok, 0, &tp, sizeof(tp), 0, 0)) return;
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g_winlink_allowed = GetLastError() != kNtErrorNotAllAssigned;
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}
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textwindows int sys_symlinkat_nt(const char *target, int newdirfd,
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const char *linkpath) {
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int targetlen;
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uint32_t attrs, flags;
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char16_t target16[PATH_MAX];
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char16_t linkpath16[PATH_MAX];
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// convert the paths
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if (__mkntpathat(newdirfd, linkpath, 0, linkpath16) == -1) return -1;
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if ((targetlen = __mkntpath(target, target16)) == -1) return -1;
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// determine if we need directory flag
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if ((attrs = __imp_GetFileAttributesW(target16)) != -1u) {
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if (attrs & kNtFileAttributeDirectory) {
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flags = kNtSymbolicLinkFlagDirectory;
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} else {
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flags = 0;
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}
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} else {
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// win32 needs to know if it's a directory of a file symlink, but
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// that's hard to determine if we're creating a broken symlink so
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// we'll fall back to checking for trailing slash
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if (targetlen && target16[targetlen - 1] == '\\') {
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flags = kNtSymbolicLinkFlagDirectory;
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} else {
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flags = 0;
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}
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}
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// windows only lets administrators do this
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// even then we're required to ask for permission
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pthread_once(&g_winlink_once, InitializeWinlink);
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if (!g_winlink_allowed) {
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return eperm();
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}
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// we can now proceed
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if (CreateSymbolicLink(linkpath16, target16, flags)) {
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return 0;
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} else {
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return __fix_enotdir(-1, linkpath16);
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}
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}
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