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os_functions_lin.cpp
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os_functions_lin.cpp
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/*************************************************************************
* UrBackup - Client/Server backup system
* Copyright (C) 2011-2016 Martin Raiber
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
**************************************************************************/
#include "os_functions.h"
#include "../stringtools.h"
#include "server_compat.h"
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <utime.h>
#include <dirent.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <algorithm>
#include <memory.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <time.h>
#include <sys/time.h>
#include <limits.h>
#include "../config.h"
#ifdef __linux__
#include <sys/resource.h>
#include <sys/syscall.h>
#include <linux/fs.h>
#endif
#include <stack>
#if defined(__FreeBSD__) || defined(__APPLE__)
#define lstat64 lstat
#define stat64 stat
#define statvfs64 statvfs
#define open64 open
#define readdir64 readdir
#define dirent64 dirent
#define fsblkcnt64_t fsblkcnt_t
#endif
#if defined(__APPLE__)
#include <pthread.h>
#endif
#if defined(__ANDROID__)
#define fsblkcnt64_t fsblkcnt_t
#include "android_popen.h"
#endif
void getMousePos(int &x, int &y)
{
x=0;
y=0;
}
std::vector<SFile> getFilesWin(const std::string &path, bool *has_error, bool exact_filesize, bool with_usn, bool ignore_other_fs)
{
return getFiles(path, has_error, ignore_other_fs);
}
std::vector<SFile> getFiles(const std::string &path, bool *has_error, bool ignore_other_fs)
{
if(has_error!=NULL)
{
*has_error=false;
}
std::string upath=(path);
std::vector<SFile> tmp;
DIR *dp;
struct dirent64 *dirp;
if((dp = opendir(upath.c_str())) == NULL)
{
if(has_error!=NULL)
{
*has_error=true;
}
std::string errmsg;
int err = os_last_error(errmsg);
Log("Cannot open \""+path+"\": "+errmsg+" ("+convert(err)+")", LL_ERROR);
return tmp;
}
dev_t parent_dev_id;
bool has_parent_dev_id=false;
if(ignore_other_fs)
{
struct stat64 f_info;
int rc=lstat64(upath.c_str(), &f_info);
if(rc==0)
{
has_parent_dev_id = true;
parent_dev_id = f_info.st_dev;
}
}
upath+=os_file_sep();
errno=0;
std::string last_err_fn;
while ((dirp = readdir64(dp)) != NULL)
{
SFile f;
f.name=(dirp->d_name);
if(f.name=="." || f.name==".." )
continue;
#ifdef __APPLE__
// Cannot stat certain locations due to macOS SIP restrictions
if(upath+dirp->d_name=="/Library/Caches/com.apple.aned" ||
upath+dirp->d_name=="/private/var/db/appinstalld" ||
upath+dirp->d_name=="/private/var/db/ConfigurationProfiles/Store" ||
upath+dirp->d_name=="/private/var/db/CoreDuet/Knowledge" ||
upath+dirp->d_name=="/private/var/db/DifferentialPrivacy" ||
upath+dirp->d_name=="/private/var/db/DumpPanic" ||
upath+dirp->d_name=="/private/var/db/fpsd/dvp" ||
upath+dirp->d_name=="/private/var/db/KernelExtensionManagement/Staging" ||
upath+dirp->d_name=="/private/var/db/lockdown" ||
upath+dirp->d_name=="/private/var/db/MobileIdentityService" ||
upath+dirp->d_name=="/private/var/db/oah" ||
upath+dirp->d_name=="/private/var/db/searchparty" ||
upath+dirp->d_name=="/private/var/db/sysdiagnose/com.apple.sysdiagnose" ||
upath+dirp->d_name=="/private/var/networkd/db" ||
upath+dirp->d_name=="/private/var/protected/trustd/private" ||
upath+dirp->d_name=="/System/Library/Templates/Data/private/var/db/oah")
{
Log("[macOS] Skipping \""+upath+dirp->d_name+"\" due to macOS SIP restriction", LL_INFO);
continue;
}
#endif
f.isdir=(dirp->d_type==DT_DIR);
struct stat64 f_info;
int rc=lstat64((upath+dirp->d_name).c_str(), &f_info);
if(rc==0)
{
f.isdir = S_ISDIR(f_info.st_mode);
if(ignore_other_fs && S_ISDIR(f_info.st_mode)
&& has_parent_dev_id && parent_dev_id!=f_info.st_dev)
{
continue;
}
if(S_ISLNK(f_info.st_mode))
{
f.issym=true;
f.isspecialf=true;
struct stat64 l_info;
int rc2 = stat64((upath+dirp->d_name).c_str(), &l_info);
if(rc2==0)
{
f.isdir=S_ISDIR(l_info.st_mode);
}
else
{
f.isdir=false;
}
}
f.usn = (uint64)f_info.st_mtime | ((uint64)f_info.st_ctime<<32);
if(!f.isdir)
{
if(!S_ISREG(f_info.st_mode) )
{
f.isspecialf=true;
}
f.size=f_info.st_size;
}
f.last_modified=f_info.st_mtime;
f.created = f_info.st_ctime;
f.accessed = f_info.st_atime;
}
else
{
std::string errmsg;
int err = os_last_error(errmsg);
Log("Cannot stat \""+upath+dirp->d_name+"\": "+(errmsg)+" ("+convert(err)+")", LL_ERROR);
if(has_error!=NULL)
{
*has_error=true;
}
if(!last_err_fn.empty() &&
last_err_fn==dirp->d_name)
{
Log("Returned again after error \""+upath+dirp->d_name+"\". Stopping directory iteration.", LL_ERROR);
break;
}
else
{
errno=0;
last_err_fn = dirp->d_name;
continue;
}
}
tmp.push_back(f);
errno=0;
}
if(errno!=0)
{
std::string errmsg;
int err = os_last_error(errmsg);
Log("Error listing files in directory \""+path+"\": "+errmsg+" ("+convert(err)+")", LL_ERROR);
if(has_error!=NULL)
*has_error=true;
}
closedir(dp);
std::sort(tmp.begin(), tmp.end());
return tmp;
}
bool removeFile(const std::string &path)
{
return unlink((path).c_str())==0;
}
bool moveFile(const std::string &src, const std::string &dst)
{
return rename((src).c_str(), (dst).c_str() )==0;
}
bool os_remove_symlink_dir(const std::string &path)
{
return unlink((path).c_str())==0;
}
bool os_remove_dir(const std::string &path)
{
return rmdir(path.c_str())==0;
}
bool isDirectory(const std::string &path, void* transaction)
{
struct stat64 f_info;
int rc=stat64(path.c_str(), &f_info);
if(rc!=0)
{
rc = lstat64(path.c_str(), &f_info);
if(rc!=0)
{
return false;
}
}
if ( S_ISDIR(f_info.st_mode) )
{
return true;
}
else
{
return false;
}
}
int os_get_file_type(const std::string &path)
{
int ret = 0;
struct stat64 f_info;
int rc1=stat64((path).c_str(), &f_info);
if(rc1==0)
{
if ( S_ISDIR(f_info.st_mode) )
{
ret |= EFileType_Directory;
}
else
{
ret |= EFileType_File;
}
}
int rc2 = lstat64((path).c_str(), &f_info);
if(rc2==0)
{
if(S_ISLNK(f_info.st_mode))
{
ret |= EFileType_Symlink;
}
if(!S_ISDIR(f_info.st_mode)
&& !S_ISREG(f_info.st_mode) )
{
ret |= EFileType_Special;
}
if(rc1!=0)
{
ret |= EFileType_File;
}
}
return ret;
}
int64 os_atoi64(const std::string &str)
{
return strtoll(str.c_str(), NULL, 10);
}
bool os_create_dir(const std::string &path)
{
return mkdir(path.c_str(), S_IRWXU | S_IRWXG)==0;
}
bool os_create_reflink(const std::string &linkname, const std::string &fname)
{
#ifndef sun
int src_desc=open64((fname).c_str(), O_RDONLY);
if( src_desc<0)
{
Log("Error opening source file. errno="+convert(errno), LL_INFO);
return false;
}
int dst_desc=open64((linkname).c_str(), O_WRONLY | O_CREAT | O_EXCL, S_IRWXU | S_IRWXG);
if( dst_desc<0 )
{
Log("Error opening destination file. errno="+convert(errno), LL_INFO);
close(src_desc);
return false;
}
#define BTRFS_IOCTL_MAGIC 0x94
#define BTRFS_IOC_CLONE _IOW (BTRFS_IOCTL_MAGIC, 9, int)
int rc=ioctl(dst_desc, BTRFS_IOC_CLONE, src_desc);
if(rc)
{
Log("Reflink ioctl failed. errno="+convert(errno), LL_INFO);
}
close(src_desc);
close(dst_desc);
if(rc)
{
if(unlink((linkname).c_str()))
{
Log("Removing destination file failed. errno="+convert(errno), LL_INFO);
}
}
return rc==0;
#else
return false;
#endif
}
bool os_create_hardlink(const std::string &linkname, const std::string &fname, bool use_ioref, bool* too_many_links)
{
if(too_many_links!=NULL)
*too_many_links=false;
if( use_ioref )
return os_create_reflink(linkname, fname);
int rc=link((fname).c_str(), (linkname).c_str());
return rc==0;
}
int64 os_free_space(const std::string &path)
{
std::string cp=path;
if(path.size()==0)
return -1;
if(cp[cp.size()-1]=='/')
cp.erase(cp.size()-1, 1);
if(cp[cp.size()-1]!='/')
cp+='/';
struct statvfs64 buf = {};
int rc=statvfs64((path).c_str(), &buf);
if(rc==0)
{
#if defined(__FreeBSD__) || defined(__APPLE__)
int64 free = (int64)buf.f_frsize*buf.f_bavail;
#else
fsblkcnt64_t blocksize = buf.f_frsize ? buf.f_frsize : buf.f_bsize;
fsblkcnt64_t free = blocksize*buf.f_bavail;
#endif
if(free>LLONG_MAX)
{
return LLONG_MAX;
}
return free;
}
else
{
return -1;
}
}
int64 os_total_space(const std::string &path)
{
std::string cp=path;
if(path.size()==0)
return -1;
if(cp[cp.size()-1]=='/')
cp.erase(cp.size()-1, 1);
if(cp[cp.size()-1]!='/')
cp+='/';
struct statvfs64 buf;
int rc=statvfs64((path).c_str(), &buf);
if(rc==0)
{
fsblkcnt64_t used=buf.f_blocks-buf.f_bfree;
#if defined(__FreeBSD__) || defined(__APPLE__)
int64 total = (int64)(used+buf.f_bavail)*buf.f_frsize;
#else
fsblkcnt64_t total = (used+buf.f_bavail)*buf.f_bsize;
#endif
if(total>LLONG_MAX)
{
return LLONG_MAX;
}
return total;
}
else
return -1;
}
bool os_directory_exists(const std::string &path)
{
//std::string upath=(path);
//DIR *dp=opendir(upath.c_str());
//closedir(dp);
//return dp!=NULL;
return isDirectory(path);
}
//TODO: fix returning error and check users
bool os_remove_nonempty_dir(const std::string &root_path, os_symlink_callback_t symlink_callback, void* userdata, bool delete_root)
{
if(delete_root)
{
struct stat64 f_info;
int rc = lstat64(root_path.c_str(), &f_info);
if(rc==0 && S_ISLNK(f_info.st_mode))
{
if(unlink(root_path.c_str())!=0)
{
Log("Error deleting symlink \""+root_path+"\" (root)", LL_ERROR);
}
return true;
}
}
std::stack<std::pair<std::string, bool> > paths;
paths.push(std::make_pair(root_path, false));
bool ok=true;
while(!paths.empty())
{
std::string upath=paths.top().first;
std::string path = upath;
if(paths.top().second)
{
if(paths.size()>1
|| delete_root)
{
if(rmdir(upath.c_str())!=0)
{
Log("Error deleting directory \""+upath+"\"", LL_ERROR);
}
}
paths.pop();
continue;
}
paths.top().second=true;
DIR *dp;
struct dirent *dirp;
if((dp = opendir(upath.c_str())) == NULL)
{
Log("No permission to access \""+upath+"\"", LL_ERROR);
paths.pop();
ok=false;
continue;
}
bool ok=true;
while ((dirp = readdir(dp)) != NULL)
{
if( (std::string)dirp->d_name!="." && (std::string)dirp->d_name!=".." )
{
#ifndef sun
if(dirp->d_type==DT_UNKNOWN)
{
#endif
struct stat64 f_info;
int rc=lstat64((upath+"/"+(std::string)dirp->d_name).c_str(), &f_info);
if(rc==0)
{
if(S_ISLNK(f_info.st_mode))
{
if(symlink_callback!=NULL)
{
symlink_callback((upath+"/"+(std::string)dirp->d_name), NULL, userdata);
}
else
{
if(unlink((upath+"/"+(std::string)dirp->d_name).c_str())!=0)
{
Log("Error deleting symlink \""+upath+"/"+(std::string)dirp->d_name+"\"", LL_ERROR);
}
}
}
else if(S_ISDIR(f_info.st_mode) )
{
paths.push(std::make_pair(upath+"/"+std::string(dirp->d_name), false));
}
else
{
if(unlink((upath+"/"+(std::string)dirp->d_name).c_str())!=0)
{
Log("Error deleting file \""+upath+"/"+(std::string)dirp->d_name+"\"", LL_ERROR);
}
}
}
else
{
std::string e=convert(errno);
switch(errno)
{
case EACCES: e="EACCES"; break;
case EBADF: e="EBADF"; break;
case EFAULT: e="EFAULT"; break;
case ELOOP: e="ELOOP"; break;
case ENAMETOOLONG: e="ENAMETOOLONG"; break;
case ENOENT: e="ENOENT"; break;
case ENOMEM: e="ENOMEM"; break;
case ENOTDIR: e="ENOTDIR"; break;
}
Log("No permission to stat \""+upath+"/"+dirp->d_name+"\" error: "+e, LL_ERROR);
}
#ifndef sun
}
else if(dirp->d_type==DT_DIR )
{
paths.push(std::make_pair(upath+"/"+std::string(dirp->d_name), false));
}
else if(dirp->d_type==DT_LNK )
{
if(symlink_callback!=NULL)
{
symlink_callback((upath+"/"+(std::string)dirp->d_name), NULL, userdata);
}
else
{
if(unlink((upath+"/"+(std::string)dirp->d_name).c_str())!=0)
{
Log("Error deleting symlink \""+upath+"/"+(std::string)dirp->d_name+"\"", LL_ERROR);
}
}
}
else
{
if(unlink((upath+"/"+(std::string)dirp->d_name).c_str())!=0)
{
Log("Error deleting file \""+upath+"/"+(std::string)dirp->d_name+"\"", LL_ERROR);
}
}
#endif
}
}
closedir(dp);
}
return ok;
}
std::string os_file_sep(void)
{
return "/";
}
bool os_link_symbolic(const std::string &target, const std::string &lname, void* transaction, bool* isdir)
{
return symlink(target.c_str(), lname.c_str())==0;
}
#ifndef OS_FUNC_NO_NET
bool os_lookuphostname(std::string pServer, unsigned int *dest)
{
const char* host=pServer.c_str();
unsigned int addr = inet_addr(host);
if (addr != INADDR_NONE)
{
*dest = addr;
}
else
{
addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
addrinfo* h;
if(getaddrinfo(pServer.c_str(), NULL, &hints, &h)==0)
{
if(h!=NULL)
{
in_addr tmp;
if(h->ai_addrlen>=sizeof(sockaddr_in))
{
*dest=reinterpret_cast<sockaddr_in*>(h->ai_addr)->sin_addr.s_addr;
freeaddrinfo(h);
return true;
}
else
{
freeaddrinfo(h);
return false;
}
}
else
{
return false;
}
}
else
{
return false;
}
}
return true;
}
bool os_lookuphostname(std::string pServer, SLookupResult & dest)
{
const char* host = pServer.c_str();
unsigned int addr = inet_addr(host);
if (addr != INADDR_NONE)
{
dest.is_ipv6 = false;
dest.addr_v4 = addr;
return true;
}
int rc = inet_pton(AF_INET6, host, dest.addr_v6);
if (rc == 1)
{
dest.is_ipv6 = true;
return true;
}
addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
addrinfo* h;
if (getaddrinfo(pServer.c_str(), NULL, &hints, &h) == 0)
{
addrinfo* orig_h = h;
while (h != NULL)
{
if (h->ai_family != AF_INET6
&& h->ai_family != AF_INET)
{
h = h->ai_next;
continue;
}
if (h->ai_family == AF_INET6)
{
if (h->ai_addrlen >= sizeof(sockaddr_in6))
{
dest.is_ipv6 = true;
memcpy(dest.addr_v6, &reinterpret_cast<sockaddr_in6*>(h->ai_addr)->sin6_addr, 16);
freeaddrinfo(orig_h);
return true;
}
else
{
freeaddrinfo(orig_h);
return false;
}
}
else
{
if (h->ai_addrlen >= sizeof(sockaddr_in))
{
dest.is_ipv6 = false;
dest.addr_v4 = reinterpret_cast<sockaddr_in*>(h->ai_addr)->sin_addr.s_addr;
freeaddrinfo(orig_h);
return true;
}
else
{
freeaddrinfo(orig_h);
return false;
}
}
h = h->ai_next;
}
freeaddrinfo(orig_h);
return false;
}
else
{
return false;
}
}
#endif //OS_FUNC_NO_NET
std::string os_file_prefix(std::string path)
{
return path;
}
bool os_file_truncate(const std::string &fn, int64 fsize)
{
if( truncate((fn).c_str(), (off_t)fsize) !=0 )
{
return false;
}
return true;
}
std::string os_strftime(std::string fs)
{
time_t rawtime;
char buffer [100];
time ( &rawtime );
struct tm *timeinfo;
timeinfo = localtime ( &rawtime );
strftime (buffer,100,fs.c_str(),timeinfo);
std::string r(buffer);
return r;
}
bool os_create_dir_recursive(std::string fn)
{
if(fn.empty())
return false;
bool b=os_create_dir(fn);
if(!b)
{
b=os_create_dir_recursive(ExtractFilePath(fn));
if(!b)
return false;
return os_create_dir(fn);
}
else
{
return true;
}
}
bool os_rename_file(std::string src, std::string dst, void* transaction)
{
int rc=rename(src.c_str(), dst.c_str());
return rc==0;
}
bool os_get_symlink_target(const std::string &lname, std::string &target)
{
struct stat sb;
if(lstat(lname.c_str(), &sb)==-1)
{
return false;
}
target.resize(sb.st_size);
ssize_t rc = readlink(lname.c_str(), &target[0], sb.st_size);
if(rc<0)
{
return false;
}
if(rc > sb.st_size)
{
return false;
}
else if(rc<sb.st_size)
{
target.resize(rc);
}
return true;
}
bool os_is_symlink(const std::string &lname)
{
struct stat sb;
if(lstat(lname.c_str(), &sb)==-1)
{
return false;
}
return S_ISLNK(sb.st_mode);
}
void* os_start_transaction()
{
return NULL;
}
bool os_finish_transaction(void* transaction)
{
return false;
}
int64 os_last_error()
{
return errno;
}
std::string os_format_errcode(int64 errcode)
{
int err = static_cast<int>(errcode);
char* str = strerror(err);
if(str!=NULL)
{
return str;
}
return std::string();
}
int64 os_last_error(std::string& message)
{
int err = errno;
message = os_format_errcode(err);
return err;
}
const int64 WINDOWS_TICK=10000000;
const int64 SEC_TO_UNIX_EPOCH=11644473600LL;
int64 os_windows_to_unix_time(int64 windows_filetime)
{
return windows_filetime / WINDOWS_TICK - SEC_TO_UNIX_EPOCH;
}
int64 os_to_windows_filetime(int64 unix_time)
{
return (unix_time+SEC_TO_UNIX_EPOCH)*WINDOWS_TICK;
}
bool os_set_file_time(const std::string& fn, int64 created, int64 last_modified, int64 accessed)
{
time_t atime = static_cast<time_t>(accessed);
time_t mtime = static_cast<time_t>(last_modified);
#if !defined(__APPLE__) && !defined(__FreeBSD__)
#if defined(HAVE_UTIMENSAT)
timespec tss[2];
tss[0].tv_sec = atime;
tss[0].tv_nsec = 0;
tss[1].tv_sec = mtime;
tss[1].tv_nsec = 0;
int rc = utimensat(0, fn.c_str(), tss, AT_SYMLINK_NOFOLLOW);
#else
struct timeval tv[2];
tv[0].tv_sec = atime;
tv[0].tv_usec = 0;
tv[1].tv_sec = mtime;
tv[1].tv_usec = 0;
int rc = utimes(fn.c_str(), tv);
#endif
return rc==0;
#else
struct timeval tv[2];
tv[0].tv_sec = atime;
tv[0].tv_usec = 0;
tv[1].tv_sec = mtime;
tv[1].tv_usec = 0;
int rc = lutimes(fn.c_str(), tv);
return rc==0;
#endif
}
#ifndef OS_FUNC_NO_SERVER
bool copy_file(const std::string &src, const std::string &dst, bool flush, std::string* error_str)
{
IFile *fsrc=Server->openFile(src, MODE_READ);
if (fsrc == NULL)
{
if (error_str != NULL)
{
*error_str = os_last_error_str();
}
return false;
}
IFile *fdst=Server->openFile(dst, MODE_WRITE);
if(fdst==NULL)
{
if (error_str != NULL)
{
*error_str = os_last_error_str();
}
Server->destroy(fsrc);
return false;
}
bool copy_ok = copy_file(fsrc, fdst, error_str);
if (copy_ok && flush)
{
copy_ok = fdst->Sync();
if (!copy_ok
&& error_str!=NULL)
{
*error_str = os_last_error_str();
}
}
Server->destroy(fsrc);
Server->destroy(fdst);
return copy_ok;
}
bool copy_file(IFile *fsrc, IFile *fdst, std::string* error_str)
{
if(fsrc==NULL || fdst==NULL)
{
return false;
}
if(!fsrc->Seek(0))
{
return false;
}
if(!fdst->Seek(0))
{
return false;
}
char buf[4096];
size_t rc;
bool has_error=false;
while( (rc=(_u32)fsrc->Read(buf, 4096, &has_error))>0)
{
if(has_error)
{
if (error_str != NULL)
{
*error_str = os_last_error_str();
}
break;
}
if(rc>0)
{
fdst->Write(buf, (_u32)rc, &has_error);
if(has_error)
{
if (error_str != NULL)
{