mirror of
https://github.com/jart/cosmopolitan.git
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69 lines
3.4 KiB
C
69 lines
3.4 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/internal.h"
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#include "libc/errno.h"
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#include "libc/nt/enum/accessmask.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/sysv/errfuns.h"
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static bool g_can_symlink;
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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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uint32_t flags;
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char16_t target16[PATH_MAX];
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char16_t linkpath16[PATH_MAX];
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if (!g_can_symlink) return eacces();
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flags = isdirectory(target) ? kNtSymbolicLinkFlagDirectory : 0;
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if (__mkntpathat(newdirfd, linkpath, 0, linkpath16) == -1) return -1;
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if (__mkntpath(target, target16) == -1) return -1;
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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 __winerr();
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}
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}
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static textstartup bool EnableSymlink(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 0;
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if (!LookupPrivilegeValue(0, u"SeCreateSymbolicLinkPrivilege", &id)) return 0;
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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 0;
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return GetLastError() != kNtErrorNotAllAssigned;
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}
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static textstartup void g_can_symlink_init() {
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g_can_symlink = EnableSymlink();
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}
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const void *const g_can_symlink_ctor[] initarray = {
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g_can_symlink_init,
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};
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