File: xattr.c

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#include "xattr.h"
#include "fingerprint.h"

#ifdef USE_XATTR
 #include <sys/types.h>
 #include <sys/xattr.h>
#endif

#ifdef USE_EXTATTR
 #include <sys/types.h>
 #include <sys/extattr.h>
#endif



char **XAttrList=NULL;



void SetupXAttrList(const char *Arg)
{
char *Token=NULL;
const char *ptr;
//count starts at 1 because even if the first string is an empty string, we need to alloc space
//for it.
int count=1;



ptr=strchr(Arg, ',');
while (ptr)
{
  count++;
  ptr++;
  ptr=strchr(ptr, ',');
}

//count+1 to allow room for terminating NULL
XAttrList=calloc(count+1,sizeof(char *));

count=0;
ptr=GetToken(Arg, ",",&Token,0);
while (ptr)
{
  XAttrList[count]=CopyStr(XAttrList[count],Token);
  ptr=GetToken(ptr, ",",&Token,0);
  count++;
}

Destroy(Token);
}


void HashRatSetXAttr(HashratCtx *Ctx, const char *Path, struct stat *Stat, const char *HashType, const char *Hash)
{
char *Tempstr=NULL, *Attr=NULL;
char **ptr;
int result;

	Tempstr=FormatStr(Tempstr,"%llu:%llu:%s",(unsigned long) time(NULL),(unsigned long long) Stat->st_size,Hash);


#ifdef USE_XATTR
	if ((Ctx->Flags & CTX_XATTR_ROOT) && (getuid()==0)) Attr=MCopyStr(Attr,"trusted.","hashrat:",HashType,NULL);
	else Attr=MCopyStr(Attr,"user.","hashrat:",HashType,NULL);

	result=setxattr(Path, Attr, Tempstr, StrLen(Tempstr)+1, 0);
	if (result != 0) fprintf(stderr,"ERROR: Failed to store hash in extended attributes for %s\n", Path);
#elif defined USE_EXTATTR
	Attr=MCopyStr(Attr,"hashrat:",HashType,NULL);
	if ((Ctx->Flags & CTX_XATTR_ROOT) && (getuid()==0)) result=extattr_set_file(Path, EXTATTR_NAMESPACE_SYSTEM, Attr, Tempstr, StrLen(Tempstr)+1);
	else result=extattr_set_file(Path, EXTATTR_NAMESPACE_USER, Attr, Tempstr, StrLen(Tempstr)+1);
	if (result < 1) fprintf(stderr,"ERROR: Failed to store hash in extended attributes for %s\n", Path);
#else
	fprintf(stderr,"XATTR Support not compiled in.\n");
	exit(1);
#endif



	if (XAttrList)
	{
		for(ptr=XAttrList; *ptr !=NULL; ptr++)
		{
#ifdef USE_XATTR
		setxattr(Path, *ptr, Hash, StrLen(Hash), 0);
#elif defined USE_EXTATTR
		extattr_set_file(Path, EXTATTR_NAMESPACE_USER, Attr, Tempstr, StrLen(Tempstr)+1);
#endif
		}
	}

Destroy(Tempstr);
Destroy(Attr);

}


int XAttrGetHash(HashratCtx *Ctx, const char *XattrType, const char *HashType, const char *Path, struct stat *FStat, char **Hash)
{
int result=FALSE;
char *Tempstr=NULL;
char *ptr;
int len;

*Hash=SetStrLen(*Hash,255);
#ifdef USE_XATTR
Tempstr=MCopyStr(Tempstr,XattrType, ".hashrat:",HashType,NULL);
len=getxattr(Path, Tempstr, *Hash, 255); 
#elif defined USE_EXTATTR
Tempstr=MCopyStr(Tempstr,"hashrat:",HashType,NULL);
if ((strcmp(XattrType,"trusted")==0) || (strcmp(XattrType,"system")==0)) len=extattr_get_file(Path, EXTATTR_NAMESPACE_SYSTEM, Tempstr, *Hash, 255);
else len=extattr_get_file(Path, EXTATTR_NAMESPACE_USER, Tempstr, *Hash, 255);
#endif

if (len > 0)
{
	(*Hash)[len]='\0';
	ptr=*Hash;
	FStat->st_mtime=(time_t) strtoll(ptr,&ptr,10);
	if (*ptr==':') ptr++;
	FStat->st_size=(off_t) strtoll(ptr,&ptr,10);
	if (*ptr==':') ptr++;
	len=StrLen(ptr);
	memmove(*Hash,ptr,len+1);
	result=TRUE;
}

Destroy(Tempstr);

return(result);
}



TFingerprint *XAttrLoadHash(HashratCtx *Ctx, const char *Path)
{
char *XattrTypes[]={"trusted","user",NULL};
TFingerprint *FP=NULL;
char *Tempstr=NULL;
int i, j, found=FALSE;


FP=(TFingerprint *) calloc(1, sizeof(TFingerprint));
FP->Path=CopyStr(FP->Path, Path);
FP->Hash=SetStrLen(FP->Hash,1024);
for (j=0; XattrTypes[j]; j++)
{
	if (StrValid(Ctx->HashType)) 
	{
		found=XAttrGetHash(Ctx, XattrTypes[j], Ctx->HashType, Path, &FP->FStat, &FP->Hash);
		FP->HashType=CopyStr(FP->HashType,Ctx->HashType);
	}
	else for (i=0; HashratHashTypes[i] != NULL; i++)
	{
		found=XAttrGetHash(Ctx, XattrTypes[j], HashratHashTypes[i], Path, &FP->FStat, &FP->Hash);
		if (found > 0)
		{
			FP->HashType=CopyStr(FP->HashType,HashratHashTypes[i]);
			break;
		}
	}
	if (found) break;
}

Destroy(Tempstr);

if (! found)
{
	TFingerprintDestroy(FP);
	return(NULL);
}

return(FP);
}