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9e3331dab4a94deafcd23d07f77bc4ce0f097aba
mergerfs/src/fuse_setxattr.cpp
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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_base_setxattr.hpp"
#include "fs_glob.hpp"
#include "fs_path.hpp"
#include "fs_statvfs_cache.hpp"
#include "num.hpp"
#include "rv.hpp"
#include "rwlock.hpp"
#include "str.hpp"
#include "ugid.hpp"
#include <fuse.h>
#include <sstream>
#include <string>
#include <vector>
#include <string.h>
static const char SECURITY_CAPABILITY[] = "security.capability";
using std::string;
using std::vector;
namespace l
{
static
bool
is_attrname_security_capability(const char *attrname_)
{
return (strcmp(attrname_,SECURITY_CAPABILITY) == 0);
}
static
void
split_attrval(const string &attrval,
string &instruction,
string &values)
{
size_t offset;
offset = attrval.find_first_of('/');
instruction = attrval.substr(0,offset);
if(offset != string::npos)
values = attrval.substr(offset);
}
static
int
setxattr_srcmounts(const string &attrval,
const int flags,
Branches &branches_,
pthread_rwlock_t &branches_lock)
{
const rwlock::WriteGuard wrg(&branches_lock);
string instruction;
string values;
if((flags & XATTR_CREATE) == XATTR_CREATE)
return -EEXIST;
l::split_attrval(attrval,instruction,values);
if(instruction == "+")
branches_.add_end(values);
else if(instruction == "+<")
branches_.add_begin(values);
else if(instruction == "+>")
branches_.add_end(values);
else if(instruction == "-")
branches_.erase_fnmatch(values);
else if(instruction == "-<")
branches_.erase_begin();
else if(instruction == "->")
branches_.erase_end();
else if(instruction == "=")
branches_.set(values);
else if(instruction.empty())
branches_.set(values);
else
return -EINVAL;
return 0;
}
static
int
setxattr_uint64_t(const string &attrval,
const int flags,
uint64_t &uint)
{
int rv;
if((flags & XATTR_CREATE) == XATTR_CREATE)
return -EEXIST;
rv = num::to_uint64_t(attrval,uint);
if(rv == -1)
return -EINVAL;
return 0;
}
static
int
setxattr_double(const string &attrval_,
const int flags_,
double *d_)
{
int rv;
if((flags_ & XATTR_CREATE) == XATTR_CREATE)
return -EEXIST;
rv = num::to_double(attrval_,d_);
if(rv == -1)
return -EINVAL;
return 0;
}
static
int
setxattr_time_t(const string &attrval,
const int flags,
time_t &time)
{
int rv;
if((flags & XATTR_CREATE) == XATTR_CREATE)
return -EEXIST;
rv = num::to_time_t(attrval,time);
if(rv == -1)
return -EINVAL;
return 0;
}
static
int
setxattr_bool(const string &attrval,
const int flags,
bool &value)
{
if((flags & XATTR_CREATE) == XATTR_CREATE)
return -EEXIST;
if(attrval == "false")
value = false;
else if(attrval == "true")
value = true;
else
return -EINVAL;
return 0;
}
static
int
setxattr_xattr(const string &attrval_,
const int flags_,
int xattr_)
{
if((flags_ & XATTR_CREATE) == XATTR_CREATE)
return -EEXIST;
if(attrval_ == "passthrough")
xattr_ = 0;
else if(attrval_ == "noattr")
xattr_ = ENOATTR;
else if(attrval_ == "nosys")
xattr_ = ENOSYS;
else
return -EINVAL;
return 0;
}
static
int
setxattr_statfs(const string &attrval_,
const int flags_,
Config::StatFS::Enum &enum_)
{
if((flags_ & XATTR_CREATE) == XATTR_CREATE)
return -EEXIST;
if(attrval_ == "base")
enum_ = Config::StatFS::BASE;
else if(attrval_ == "full")
enum_ = Config::StatFS::FULL;
else
return -EINVAL;
return 0;
}
static
int
setxattr_statfsignore(const string &attrval_,
const int flags_,
Config::StatFSIgnore::Enum &enum_)
{
if((flags_ & XATTR_CREATE) == XATTR_CREATE)
return -EEXIST;
if(attrval_ == "none")
enum_ = Config::StatFSIgnore::NONE;
else if(attrval_ == "ro")
enum_ = Config::StatFSIgnore::RO;
else if(attrval_ == "nc")
enum_ = Config::StatFSIgnore::NC;
else
return -EINVAL;
return 0;
}
static
int
setxattr_controlfile_func_policy(Config &config,
const string &funcname,
const string &attrval,
const int flags)
{
int rv;
if((flags & XATTR_CREATE) == XATTR_CREATE)
return -EEXIST;
if(funcname == "open")
config.open_cache.clear();
rv = config.set_func_policy(funcname,attrval);
if(rv == -1)
return -errno;
return 0;
}
static
int
setxattr_controlfile_category_policy(Config &config,
const string &categoryname,
const string &attrval,
const int flags)
{
int rv;
if((flags & XATTR_CREATE) == XATTR_CREATE)
return -EEXIST;
if(categoryname == "search")
config.open_cache.clear();
rv = config.set_category_policy(categoryname,attrval);
if(rv == -1)
return -errno;
return 0;
}
static
int
setxattr_statfs_timeout(const string &attrval_,
const int flags_)
{
int rv;
uint64_t timeout;
rv = l::setxattr_uint64_t(attrval_,flags_,timeout);
if(rv >= 0)
fs::statvfs_cache_timeout(timeout);
return rv;
}
static
int
setxattr_controlfile_cache_attr(const string &attrval_,
const int flags_)
{
int rv;
double d;
rv = l::setxattr_double(attrval_,flags_,&d);
if(rv >= 0)
fuse_config_set_attr_timeout(fuse_get_context()->fuse,d);
return rv;
}
static
int
setxattr_controlfile_cache_entry(const string &attrval_,
const int flags_)
{
int rv;
double d;
rv = l::setxattr_double(attrval_,flags_,&d);
if(rv >= 0)
fuse_config_set_entry_timeout(fuse_get_context()->fuse,d);
return rv;
}
static
int
setxattr_controlfile_cache_negative_entry(const string &attrval_,
const int flags_)
{
int rv;
double d;
rv = l::setxattr_double(attrval_,flags_,&d);
if(rv >= 0)
fuse_config_set_negative_entry_timeout(fuse_get_context()->fuse,d);
return rv;
}
static
int
setxattr_controlfile(Config &config,
const string &attrname,
const string &attrval,
const int flags)
{
vector<string> attr;
str::split(attr,attrname,'.');
switch(attr.size())
{
case 3:
if(attr[2] == "srcmounts")
return l::setxattr_srcmounts(attrval,
flags,
config.branches,
config.branches_lock);
else if(attr[2] == "branches")
return l::setxattr_srcmounts(attrval,
flags,
config.branches,
config.branches_lock);
else if(attr[2] == "minfreespace")
return l::setxattr_uint64_t(attrval,
flags,
config.minfreespace);
else if(attr[2] == "moveonenospc")
return l::setxattr_bool(attrval,
flags,
config.moveonenospc);
else if(attr[2] == "dropcacheonclose")
return l::setxattr_bool(attrval,
flags,
config.dropcacheonclose);
else if(attr[2] == "symlinkify")
return l::setxattr_bool(attrval,
flags,
config.symlinkify);
else if(attr[2] == "symlinkify_timeout")
return l::setxattr_time_t(attrval,
flags,
config.symlinkify_timeout);
else if(attr[2] == "ignorepponrename")
return l::setxattr_bool(attrval,
flags,
config.ignorepponrename);
else if(attr[2] == "security_capability")
return l::setxattr_bool(attrval,
flags,
config.security_capability);
else if(attr[2] == "xattr")
return l::setxattr_xattr(attrval,
flags,
config.xattr);
else if(attr[2] == "link_cow")
return l::setxattr_bool(attrval,
flags,
config.link_cow);
else if(attr[2] == "statfs")
return l::setxattr_statfs(attrval,
flags,
config.statfs);
else if(attr[2] == "statfs_ignore")
return l::setxattr_statfsignore(attrval,
flags,
config.statfs_ignore);
else if(attr[2] == "direct_io")
return l::setxattr_bool(attrval,
flags,
config.direct_io);
break;
case 4:
if(attr[2] == "category")
return l::setxattr_controlfile_category_policy(config,
attr[3],
attrval,
flags);
else if(attr[2] == "func")
return l::setxattr_controlfile_func_policy(config,
attr[3],
attrval,
flags);
else if((attr[2] == "cache") && (attr[3] == "open"))
return l::setxattr_uint64_t(attrval,
flags,
config.open_cache.timeout);
else if((attr[2] == "cache") && (attr[3] == "statfs"))
return l::setxattr_statfs_timeout(attrval,flags);
else if((attr[2] == "cache") && (attr[3] == "attr"))
return l::setxattr_controlfile_cache_attr(attrval,flags);
else if((attr[2] == "cache") && (attr[3] == "entry"))
return l::setxattr_controlfile_cache_entry(attrval,flags);
else if((attr[2] == "cache") && (attr[3] == "negative_entry"))
return l::setxattr_controlfile_cache_negative_entry(attrval,flags);
break;
default:
break;
}
return -EINVAL;
}
static
int
setxattr_loop_core(const string *basepath,
const char *fusepath,
const char *attrname,
const char *attrval,
const size_t attrvalsize,
const int flags,
const int error)
{
int rv;
string fullpath;
fullpath = fs::path::make(basepath,fusepath);
rv = fs::lsetxattr(fullpath,attrname,attrval,attrvalsize,flags);
return error::calc(rv,error,errno);
}
static
int
setxattr_loop(const vector<const string*> &basepaths,
const char *fusepath,
const char *attrname,
const char *attrval,
const size_t attrvalsize,
const int flags)
{
int error;
error = -1;
for(size_t i = 0, ei = basepaths.size(); i != ei; i++)
{
error = l::setxattr_loop_core(basepaths[i],fusepath,
attrname,attrval,attrvalsize,flags,
error);
}
return -error;
}
static
int
setxattr(Policy::Func::Action actionFunc,
const Branches &branches_,
const uint64_t minfreespace,
const char *fusepath,
const char *attrname,
const char *attrval,
const size_t attrvalsize,
const int flags)
{
int rv;
vector<const string*> basepaths;
rv = actionFunc(branches_,fusepath,minfreespace,basepaths);
if(rv == -1)
return -errno;
return l::setxattr_loop(basepaths,fusepath,attrname,attrval,attrvalsize,flags);
}
}
namespace FUSE
{
int
setxattr(const char *fusepath,
const char *attrname,
const char *attrval,
size_t attrvalsize,
int flags)
{
const fuse_context *fc = fuse_get_context();
const Config &config = Config::get(fc);
if(fusepath == config.controlfile)
return l::setxattr_controlfile(Config::get_writable(),
attrname,
string(attrval,attrvalsize),
flags);
if((config.security_capability == false) &&
l::is_attrname_security_capability(attrname))
return -ENOATTR;
if(config.xattr)
return -config.xattr;
const ugid::Set ugid(fc->uid,fc->gid);
const rwlock::ReadGuard readlock(&config.branches_lock);
return l::setxattr(config.setxattr,
config.branches,
config.minfreespace,
fusepath,
attrname,
attrval,
attrvalsize,
flags);
}
}
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