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Dynamically load setxattr(2) in Linux.

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This commit is contained in:
Natalia Portillo
2021-03-30 04:19:51 +01:00
parent f667090a88
commit 9569fee882
3 changed files with 27 additions and 18 deletions
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10
setter/src/darwin/xattr.c
View File

@@ -38,11 +38,11 @@ void DarwinExtendedAttributes(const char* path)
FILE* file;
int rc;
int cRc;
_darwin_setxattr setxattr;
_darwin_setxattr darwin_setxattr;
setxattr = (_darwin_setxattr)dlsym(RTLD_DEFAULT, "setxattr");
darwin_setxattr = (_darwin_setxattr)dlsym(RTLD_DEFAULT, "setxattr");
if(!setxattr)
if(!darwin_setxattr)
{
log_write("Error loading setxattr(2) from libSystem: %s\n", dlerror());
return;
@@ -82,7 +82,7 @@ void DarwinExtendedAttributes(const char* path)
{
fprintf(file, "This file has an extended attribute called \"com.ibm.os2.comment\" that is 72 bytes long.\n");
fclose(file);
ret = setxattr("com.ibm.os2.comment", "user.com.ibm.os2.comment", CommentsEA, 72, 0, 0);
ret = darwin_setxattr("com.ibm.os2.comment", "user.com.ibm.os2.comment", CommentsEA, 72, 0, 0);
if(ret) cRc = errno;
}
@@ -96,7 +96,7 @@ void DarwinExtendedAttributes(const char* path)
{
fprintf(file, "This file has an extended attribute called \"com.ibm.os2.icon\" that is 3516 bytes long.\n");
fclose(file);
ret = setxattr("com.ibm.os2.icon", "user.com.ibm.os2.icon", IconEA, 3516, 0, 0);
ret = darwin_setxattr("com.ibm.os2.icon", "user.com.ibm.os2.icon", IconEA, 3516, 0, 0);
if(ret) cRc = errno;
}

33
setter/src/linux/xattr.c
View File

@@ -22,6 +22,9 @@ Aaru Data Preservation Suite
Copyright (C) 2011-2021 Natalia Portillo
*****************************************************************************/
#define _GNU_SOURCE
#include <dlfcn.h>
#include <errno.h>
#include <features.h>
#include <stdio.h>
@@ -29,21 +32,26 @@ Copyright (C) 2011-2021 Natalia Portillo
#include <sys/stat.h>
#include <unistd.h>
#include "../log.h"
#include "linux.h"
#include "xattr.h"
#if((__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 3)) || (__GLIBC__ > 2)
#include <sys/xattr.h>
#endif
#include "../log.h"
#include "linux.h"
void LinuxExtendedAttributes(const char* path)
{
#if((__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 3)) || (__GLIBC__ > 2)
int ret;
FILE* file;
int rc;
int cRc;
int ret;
FILE* file;
int rc;
int cRc;
_linux_setxattr linux_setxattr;
linux_setxattr = (_linux_setxattr)dlsym(RTLD_DEFAULT, "setxattr");
if(!linux_setxattr)
{
log_write("Error loading setxattr(2) from libc: %s\n", dlerror());
return;
}
ret = chdir(path);
@@ -79,7 +87,7 @@ void LinuxExtendedAttributes(const char* path)
{
fprintf(file, "This file has an extended attribute called \"com.ibm.os2.comment\" that is 72 bytes long.\n");
fclose(file);
ret = setxattr("com.ibm.os2.comment", "user.com.ibm.os2.comment", CommentsEA, 72, XATTR_CREATE);
ret = linux_setxattr("com.ibm.os2.comment", "user.com.ibm.os2.comment", CommentsEA, 72, 0);
if(ret) cRc = errno;
}
@@ -93,10 +101,9 @@ void LinuxExtendedAttributes(const char* path)
{
fprintf(file, "This file has an extended attribute called \"com.ibm.os2.icon\" that is 3516 bytes long.\n");
fclose(file);
ret = setxattr("com.ibm.os2.icon", "user.com.ibm.os2.icon", IconEA, 3516, XATTR_CREATE);
ret = linux_setxattr("com.ibm.os2.icon", "user.com.ibm.os2.icon", IconEA, 3516, 0);
if(ret) cRc = errno;
}
log_write("\tFile with an extended attribute called \"com.ibm.os2.icon\", rc = %d, cRc = %d\n", rc, cRc);
#endif
}

2
setter/src/linux/xattr.h
View File

@@ -25,6 +25,8 @@ Copyright (C) 2011-2021 Natalia Portillo
#ifndef AARU_FSTESTER_SETTER_SRC_LINUX_XATTR_H_
#define AARU_FSTESTER_SETTER_SRC_LINUX_XATTR_H_
typedef int (*_linux_setxattr)(const char* path, const char* name, const void* value, size_t size, int flags);
static unsigned char CommentsEA[72] = {
0x45, 0x00, 0x00, 0x00, 0x00, 0x09, 0x33, 0x00, 0x2E, 0x43, 0x4F, 0x4D, 0x4D, 0x45, 0x4E, 0x54, 0x53, 0x00,
0xFD, 0xFF, 0x2E, 0x00, 0x54, 0x68, 0x69, 0x73, 0x20, 0x45, 0x41, 0x20, 0x63, 0x6F, 0x6E, 0x74, 0x61, 0x69,