mirror of https://github.com/trapexit/mergerfs.git
118 lines
2.5 KiB
C++
118 lines
2.5 KiB
C++
/*
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Copyright (c) 2016, Antonio SJ Musumeci <trapexit@spawn.link>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#pragma once
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#include <sys/stat.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <grp.h>
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#include <pwd.h>
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#include <map>
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#include <vector>
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#if defined SYS_setreuid32
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#define SETREUID(R,E) (::syscall(SYS_setreuid32,(R),(E)))
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#else
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#define SETREUID(R,E) (::syscall(SYS_setreuid,(R),(E)))
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#endif
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#if defined SYS_setregid32
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#define SETREGID(R,E) (::syscall(SYS_setregid32,(R),(E)))
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#else
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#define SETREGID(R,E) (::syscall(SYS_setregid,(R),(E)))
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#endif
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#if defined SYS_geteuid32
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#define GETEUID() (::syscall(SYS_geteuid32))
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#else
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#define GETEUID() (::syscall(SYS_geteuid))
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#endif
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#if defined SYS_getegid32
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#define GETEGID() (::syscall(SYS_getegid32))
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#else
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#define GETEGID() (::syscall(SYS_getegid))
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#endif
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namespace ugid
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{
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extern thread_local uid_t currentuid;
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extern thread_local gid_t currentgid;
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extern thread_local bool initialized;
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struct Set
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{
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Set(const uid_t newuid_,
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const gid_t newgid_)
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{
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if(!initialized)
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{
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currentuid = GETEUID();
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currentgid = GETEGID();
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initialized = true;
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}
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if((newuid_ == currentuid) && (newgid_ == currentgid))
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return;
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if(currentuid != 0)
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{
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SETREUID(-1,0);
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SETREGID(-1,0);
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}
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if(newgid_)
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{
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SETREGID(-1,newgid_);
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initgroups(newuid_,newgid_);
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}
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if(newuid_)
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SETREUID(-1,newuid_);
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currentuid = newuid_;
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currentgid = newgid_;
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}
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};
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struct SetRootGuard
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{
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SetRootGuard() :
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prevuid(currentuid),
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prevgid(currentgid)
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{
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Set(0,0);
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}
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~SetRootGuard()
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{
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Set(prevuid,prevgid);
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}
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const uid_t prevuid;
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const gid_t prevgid;
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};
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}
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#undef SETREUID
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#undef SETREGID
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#undef GETEUID
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#undef GETEGID
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