mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
18bb5888e1
- Remove PAGESIZE constant
- Fix realloc() documentation
- Fix ttyname_r() error reporting
- Make forking more reliable on Windows
- Make execvp() a few microseconds faster
- Make system() a few microseconds faster
- Tighten up the socket-related magic numbers
- Loosen restrictions on mmap() offset alignment
- Improve GetProgramExecutableName() with getenv("_")
- Use mkstemp() as basis for mktemp(), tmpfile(), tmpfd()
- Fix flakes in pthread_cancel_test, unix_test, fork_test
- Fix recently introduced futex stack overflow regression
- Let sockets be passed as stdio to subprocesses on Windows
- Improve security of bind() on Windows w/ SO_EXCLUSIVEADDRUSE
98 lines
4.3 KiB
C
98 lines
4.3 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 │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/syscall_support-nt.internal.h"
|
|
#include "libc/cosmo.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/nt/enum/accessmask.h"
|
|
#include "libc/nt/enum/fileflagandattributes.h"
|
|
#include "libc/nt/enum/symboliclink.h"
|
|
#include "libc/nt/enum/tokeninformationclass.h"
|
|
#include "libc/nt/errors.h"
|
|
#include "libc/nt/files.h"
|
|
#include "libc/nt/privilege.h"
|
|
#include "libc/nt/runtime.h"
|
|
#include "libc/nt/struct/luid.h"
|
|
#include "libc/nt/struct/tokenprivileges.h"
|
|
#include "libc/nt/thunk/msabi.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
__msabi extern typeof(GetFileAttributes) *const __imp_GetFileAttributesW;
|
|
|
|
static struct {
|
|
_Atomic(uint32_t) once;
|
|
_Bool allowed;
|
|
} g_winlink;
|
|
|
|
static textwindows void InitializeWinlink(void) {
|
|
int64_t tok;
|
|
struct NtLuid id;
|
|
struct NtTokenPrivileges tp;
|
|
if (!OpenProcessToken(GetCurrentProcess(), kNtTokenAllAccess, &tok)) return;
|
|
if (!LookupPrivilegeValue(0, u"SeCreateSymbolicLinkPrivilege", &id)) return;
|
|
tp.PrivilegeCount = 1;
|
|
tp.Privileges[0].Luid = id;
|
|
tp.Privileges[0].Attributes = kNtSePrivilegeEnabled;
|
|
if (!AdjustTokenPrivileges(tok, 0, &tp, sizeof(tp), 0, 0)) return;
|
|
g_winlink.allowed = GetLastError() != kNtErrorNotAllAssigned;
|
|
}
|
|
|
|
textwindows int sys_symlinkat_nt(const char *target, int newdirfd,
|
|
const char *linkpath) {
|
|
int targetlen;
|
|
uint32_t attrs, flags;
|
|
char16_t target16[PATH_MAX];
|
|
char16_t linkpath16[PATH_MAX];
|
|
|
|
// convert the paths
|
|
if (__mkntpathat(newdirfd, linkpath, 0, linkpath16) == -1) return -1;
|
|
if ((targetlen = __mkntpath(target, target16)) == -1) return -1;
|
|
|
|
// determine if we need directory flag
|
|
if ((attrs = __imp_GetFileAttributesW(target16)) != -1u) {
|
|
if (attrs & kNtFileAttributeDirectory) {
|
|
flags = kNtSymbolicLinkFlagDirectory;
|
|
} else {
|
|
flags = 0;
|
|
}
|
|
} else {
|
|
// win32 needs to know if it's a directory of a file symlink, but
|
|
// that's hard to determine if we're creating a broken symlink so
|
|
// we'll fall back to checking for trailing slash
|
|
if (targetlen && target16[targetlen - 1] == '\\') {
|
|
flags = kNtSymbolicLinkFlagDirectory;
|
|
} else {
|
|
flags = 0;
|
|
}
|
|
}
|
|
|
|
// windows only lets administrators do this
|
|
// even then we're required to ask for permission
|
|
cosmo_once(&g_winlink.once, InitializeWinlink);
|
|
if (!g_winlink.allowed) {
|
|
return eperm();
|
|
}
|
|
|
|
// we can now proceed
|
|
if (CreateSymbolicLink(linkpath16, target16, flags)) {
|
|
return 0;
|
|
} else {
|
|
return __fix_enotdir(-1, linkpath16);
|
|
}
|
|
}
|