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/*
Copyright (c) 2018, Antonio SJ Musumeci <trapexit@spawn.link>
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 "config.hpp"
#include "errno.hpp"
#include "fs_findallfiles.hpp"
#include "fs_lgetxattr.hpp"
#include "fs_path.hpp"
#include "fs_statvfs_cache.hpp"
#include "str.hpp"
#include "ugid.hpp"
#include "version.hpp"
#include "fuse.h"
#include <algorithm>
#include <sstream>
#include <string>
#include <stdio.h>
#include <string.h>
static const char SECURITY_CAPABILITY[] = "security.capability";
using std::string;
namespace l
{
static
bool
is_attrname_security_capability(const char *attrname_)
{
return (strcmp(attrname_,SECURITY_CAPABILITY) == 0);
}
static
int
lgetxattr(const string &path_,
const char *attrname_,
void *value_,
const size_t size_)
{
int rv;
rv = fs::lgetxattr(path_,attrname_,value_,size_);
return ((rv == -1) ? -errno : rv);
}
static
int
getxattr_controlfile(Config::Read &cfg_,
const char *attrname_,
char *buf_,
const size_t count_)
{
int rv;
size_t len;
string key;
string val;
StrVec attr;
if(!str::startswith(attrname_,"user.mergerfs."))
return -ENOATTR;
key = &attrname_[14];
rv = cfg_->get(key,&val);
if(rv < 0)
return rv;
len = val.size();
if(count_ == 0)
return len;
if(count_ < len)
return -ERANGE;
memcpy(buf_,val.c_str(),len);
return (int)len;
}
static
int
getxattr_from_string(char *destbuf_,
const size_t destbufsize_,
const string &src_)
{
const size_t srcbufsize = src_.size();
if(destbufsize_ == 0)
return srcbufsize;
if(srcbufsize > destbufsize_)
return -ERANGE;
memcpy(destbuf_,src_.data(),srcbufsize);
return srcbufsize;
}
static
int
getxattr_user_mergerfs_allpaths(const Branches::CPtr &branches_,
const char *fusepath_,
char *buf_,
const size_t count_)
{
string concated;
StrVec paths;
StrVec branches;
branches_->to_paths(branches);
fs::findallfiles(branches,fusepath_,&paths);
concated = str::join(paths,'\0');
return l::getxattr_from_string(buf_,count_,concated);
}
static
int
getxattr_user_mergerfs(const string &basepath_,
const char *fusepath_,
const string &fullpath_,
const Branches &branches_,
const char *attrname_,
char *buf_,
const size_t count_)
{
StrVec attr;
str::split(attrname_,'.',&attr);
if(attr[2] == "basepath")
return l::getxattr_from_string(buf_,count_,basepath_);
else if(attr[2] == "relpath")
return l::getxattr_from_string(buf_,count_,fusepath_);
else if(attr[2] == "fullpath")
return l::getxattr_from_string(buf_,count_,fullpath_);
else if(attr[2] == "allpaths")
return l::getxattr_user_mergerfs_allpaths(branches_,fusepath_,buf_,count_);
return -ENOATTR;
}
static
int
getxattr(const Policy::Search &searchFunc_,
const Branches &branches_,
const char *fusepath_,
const char *attrname_,
char *buf_,
const size_t count_)
{
int rv;
string fullpath;
StrVec basepaths;
rv = searchFunc_(branches_,fusepath_,&basepaths);
if(rv == -1)
return -errno;
fullpath = fs::path::make(basepaths[0],fusepath_);
if(str::startswith(attrname_,"user.mergerfs."))
return l::getxattr_user_mergerfs(basepaths[0],
fusepath_,
fullpath,
branches_,
attrname_,
buf_,
count_);
return l::lgetxattr(fullpath,attrname_,buf_,count_);
}
}
namespace FUSE
{
int
getxattr(const char *fusepath_,
const char *attrname_,
char *buf_,
size_t count_)
{
Config::Read cfg;
if(fusepath_ == CONTROLFILE)
return l::getxattr_controlfile(cfg,
attrname_,
buf_,
count_);
if((cfg->security_capability == false) &&
l::is_attrname_security_capability(attrname_))
return -ENOATTR;
if(cfg->xattr.to_int())
return -cfg->xattr.to_int();
const fuse_context *fc = fuse_get_context();
const ugid::Set ugid(fc->uid,fc->gid);
return l::getxattr(cfg->func.getxattr.policy,
cfg->branches,
fusepath_,
attrname_,
buf_,
count_);
}
}