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9c1dc67403
Reviewed-by: Peter Krempa <pkrempa@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
339 lines
8.8 KiB
C
339 lines
8.8 KiB
C
/*
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* Copyright (C) 2019 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Helpers for dealing with the many variants of stat(). This
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* C file should be included from any file that wants to mock
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* stat() correctly.
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*/
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#include "virmock.h"
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#include "viralloc.h"
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#include <sys/stat.h>
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#include <unistd.h>
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/*
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* The POSIX stat() function might resolve to any number of different
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* symbols in the C library.
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*
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* The may be an additional stat64() function exposed by the headers
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* too.
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*
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* On 64-bit hosts the stat & stat64 functions are identical, always
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* referring to the 64-bit ABI.
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*
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* On 32-bit hosts they refer to the 32-bit & 64-bit ABIs respectively.
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*
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* With meson libvirt will have _FILE_OFFSET_BITS=64 always defined.
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* On 32-bit hosts it causes the C library to transparently rewrite
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* stat() calls to be stat64() calls. Libvirt will never see the 32-bit
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* ABI from the traditional stat() call. We cannot assume this rewriting
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* is done using a macro. It might be, but on GLibC it is done with a
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* magic __asm__ statement to apply the rewrite at link time instead of
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* at preprocessing.
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*
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* In GLibC there may be two additional functions exposed by the headers,
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* __xstat() and __xstat64(). When these exist, stat() and stat64() are
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* transparently rewritten to call __xstat() and __xstat64() respectively.
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* The former symbols will not actually exist in the library at all, only
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* the header. The leading "__" indicates the symbols are a private impl
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* detail of the C library that applications should not care about.
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* Unfortunately, because we are trying to mock replace the C library,
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* we need to know about this internal impl detail.
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*
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* With all this in mind the list of functions we have to mock will depend
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* on several factors
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*
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* - If the stat or __xstat but there is no 64-bit version.
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*
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* - If __xstat & __xstat64 exist, then stat & stat64 will not exist
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* as symbols in the library, so the latter should not be mocked.
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*
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* The same all applies to lstat()
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*/
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#if defined(WITH_STAT) && !defined(WITH___XSTAT) && !defined(WITH_STAT64)
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# define MOCK_STAT
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#endif
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#if defined(WITH_STAT64) && !defined(WITH___XSTAT64)
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# define MOCK_STAT64
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#endif
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#if defined(WITH___XSTAT) && !defined(WITH___XSTAT64)
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# define MOCK___XSTAT
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#endif
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#if defined(WITH___XSTAT64)
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# define MOCK___XSTAT64
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#endif
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#if defined(WITH_LSTAT) && !defined(WITH___LXSTAT) && !defined(WITH_LSTAT64)
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# define MOCK_LSTAT
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#endif
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#if defined(WITH_LSTAT64) && !defined(WITH___LXSTAT64)
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# define MOCK_LSTAT64
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#endif
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#if defined(WITH___LXSTAT) && !defined(WITH___LXSTAT64)
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# define MOCK___LXSTAT
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#endif
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#if defined(WITH___LXSTAT64)
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# define MOCK___LXSTAT64
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#endif
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#ifdef MOCK_STAT
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static int (*real_stat)(const char *path, struct stat *sb);
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#endif
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#ifdef MOCK_STAT64
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static int (*real_stat64)(const char *path, struct stat64 *sb);
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#endif
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#ifdef MOCK___XSTAT
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static int (*real___xstat)(int ver, const char *path, struct stat *sb);
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#endif
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#ifdef MOCK___XSTAT64
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static int (*real___xstat64)(int ver, const char *path, struct stat64 *sb);
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#endif
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#ifdef MOCK_LSTAT
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static int (*real_lstat)(const char *path, struct stat *sb);
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#endif
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#ifdef MOCK_LSTAT64
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static int (*real_lstat64)(const char *path, struct stat64 *sb);
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#endif
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#ifdef MOCK___LXSTAT
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static int (*real___lxstat)(int ver, const char *path, struct stat *sb);
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#endif
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#ifdef MOCK___LXSTAT64
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static int (*real___lxstat64)(int ver, const char *path, struct stat64 *sb);
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#endif
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static bool init;
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static bool debug;
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#define fdebug(msg, ...) do { if (debug) fprintf(stderr, msg, __VA_ARGS__); } while (0)
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static void virMockStatInit(void)
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{
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if (init)
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return;
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init = true;
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debug = getenv("VIR_MOCK_STAT_DEBUG");
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#ifdef MOCK_STAT
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# ifdef __APPLE__
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VIR_MOCK_REAL_INIT_ALIASED(stat, "stat$INODE64");
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# else
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VIR_MOCK_REAL_INIT(stat);
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# endif
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fdebug("real stat %p\n", real_stat);
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#endif
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#ifdef MOCK_STAT64
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VIR_MOCK_REAL_INIT(stat64);
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fdebug("real stat64 %p\n", real_stat64);
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#endif
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#ifdef MOCK___XSTAT
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VIR_MOCK_REAL_INIT(__xstat);
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fdebug("real __xstat %p\n", real___xstat);
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#endif
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#ifdef MOCK___XSTAT64
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VIR_MOCK_REAL_INIT(__xstat64);
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fdebug("real __xstat64 %p\n", real___xstat64);
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#endif
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#ifdef MOCK_LSTAT
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# ifdef __APPLE__
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VIR_MOCK_REAL_INIT_ALIASED(stat, "lstat$INODE64");
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# else
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VIR_MOCK_REAL_INIT(lstat);
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# endif
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fdebug("real lstat %p\n", real_lstat);
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#endif
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#ifdef MOCK_LSTAT64
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VIR_MOCK_REAL_INIT(lstat64);
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fdebug("real lstat64 %p\n", real_lstat64);
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#endif
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#ifdef MOCK___LXSTAT
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VIR_MOCK_REAL_INIT(__lxstat);
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fdebug("real __lxstat %p\n", real___lxstat);
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#endif
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#ifdef MOCK___LXSTAT64
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VIR_MOCK_REAL_INIT(__lxstat64);
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fdebug("real __lxstat64 %p\n", real___lxstat64);
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#endif
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}
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/*
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* @stat: the path being queried
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* @newpath: fill with redirected path, or leave NULL to use orig path
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*
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* Return 0 on success, -1 on allocation error
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*/
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static int virMockStatRedirect(const char *path, char **newpath);
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#ifndef VIR_MOCK_STAT_HOOK
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# define VIR_MOCK_STAT_HOOK do { } while (0)
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#endif
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#ifdef MOCK_STAT
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# ifdef __APPLE__
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int _stat(const char *path, struct stat *sb) __asm("_stat$INODE64");
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int _stat(const char *path, struct stat *sb)
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# else
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int stat(const char *path, struct stat *sb)
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# endif
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{
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g_autofree char *newpath = NULL;
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virMockStatInit();
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if (virMockStatRedirect(path, &newpath) < 0)
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abort();
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fdebug("stat redirect %s to %s sb=%p\n", path, newpath ? newpath : path, sb);
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VIR_MOCK_STAT_HOOK;
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return real_stat(newpath ? newpath : path, sb);
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}
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#endif
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#ifdef MOCK_STAT64
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int stat64(const char *path, struct stat64 *sb)
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{
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g_autofree char *newpath = NULL;
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virMockStatInit();
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if (virMockStatRedirect(path, &newpath) < 0)
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abort();
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fdebug("stat64 redirect %s to %s sb=%p\n", path, newpath ? newpath : path, sb);
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VIR_MOCK_STAT_HOOK;
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return real_stat64(newpath ? newpath : path, sb);
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}
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#endif
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#ifdef MOCK___XSTAT
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int
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__xstat(int ver, const char *path, struct stat *sb)
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{
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g_autofree char *newpath = NULL;
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virMockStatInit();
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if (virMockStatRedirect(path, &newpath) < 0)
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abort();
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fdebug("__xstat redirect %s to %s sb=%p\n", path, newpath ? newpath : path, sb);
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VIR_MOCK_STAT_HOOK;
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return real___xstat(ver, newpath ? newpath : path, sb);
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}
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#endif
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#ifdef MOCK___XSTAT64
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int
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__xstat64(int ver, const char *path, struct stat64 *sb)
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{
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g_autofree char *newpath = NULL;
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virMockStatInit();
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if (virMockStatRedirect(path, &newpath) < 0)
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abort();
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fdebug("__xstat64 redirect %s to %s sb=%p\n", path, newpath ? newpath : path, sb);
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VIR_MOCK_STAT_HOOK;
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return real___xstat64(ver, newpath ? newpath : path, sb);
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}
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#endif
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#ifdef MOCK_LSTAT
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# ifdef __APPLE__
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int _lstat(const char *path, struct stat *sb) __asm("_lstat$INODE64");
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int _lstat(const char *path, struct stat *sb)
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# else
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int
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lstat(const char *path, struct stat *sb)
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# endif
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{
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g_autofree char *newpath = NULL;
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virMockStatInit();
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if (virMockStatRedirect(path, &newpath) < 0)
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abort();
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fdebug("lstat redirect %s to %s sb=%p\n", path, newpath ? newpath : path, sb);
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VIR_MOCK_STAT_HOOK;
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return real_lstat(newpath ? newpath : path, sb);
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}
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#endif
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#ifdef MOCK_LSTAT64
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int
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lstat64(const char *path, struct stat64 *sb)
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{
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g_autofree char *newpath = NULL;
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virMockStatInit();
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if (virMockStatRedirect(path, &newpath) < 0)
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abort();
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fdebug("lstat64 redirect %s to %s sb=%p\n", path, newpath ? newpath : path, sb);
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VIR_MOCK_STAT_HOOK;
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return real_lstat64(newpath ? newpath : path, sb);
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}
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#endif
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#ifdef MOCK___LXSTAT
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int
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__lxstat(int ver, const char *path, struct stat *sb)
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{
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g_autofree char *newpath = NULL;
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virMockStatInit();
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if (virMockStatRedirect(path, &newpath) < 0)
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abort();
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fdebug("__lxstat redirect %s to %s sb=%p\n", path, newpath ? newpath : path, sb);
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VIR_MOCK_STAT_HOOK;
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return real___lxstat(ver, newpath ? newpath : path, sb);
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}
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#endif
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#ifdef MOCK___LXSTAT64
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int
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__lxstat64(int ver, const char *path, struct stat64 *sb)
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{
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g_autofree char *newpath = NULL;
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virMockStatInit();
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if (virMockStatRedirect(path, &newpath) < 0)
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abort();
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fdebug("__lxstat64 redirect %s to %s sb=%p\n", path, newpath ? newpath : path, sb);
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VIR_MOCK_STAT_HOOK;
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return real___lxstat64(ver, newpath ? newpath : path, sb);
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}
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#endif
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