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libbb: Add xsetegid(), xseteuid(), xopen_as_uid_gid() functions

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Signed-off-by: Ryan Mallon <rmallon@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Ryan Mallon
2013-10-08 14:52:49 +02:00
committed by Denys Vlasenko
parent 932e233a49
commit 5906a5c26c
2 changed files with 42 additions and 12 deletions
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45
libbb/xfuncs_printf.c
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@@ -140,15 +140,6 @@ int FAST_FUNC xopen(const char *pathname, int flags)
return xopen3(pathname, flags, 0666);
}
/* Die if we can't open an existing file readonly with O_NONBLOCK
* and return the fd.
* Note that for ioctl O_RDONLY is sufficient.
*/
int FAST_FUNC xopen_nonblocking(const char *pathname)
{
return xopen(pathname, O_RDONLY | O_NONBLOCK);
}
// Warn if we can't open a file and return a fd.
int FAST_FUNC open3_or_warn(const char *pathname, int flags, int mode)
{
@@ -167,6 +158,32 @@ int FAST_FUNC open_or_warn(const char *pathname, int flags)
return open3_or_warn(pathname, flags, 0666);
}
/* Die if we can't open an existing file readonly with O_NONBLOCK
* and return the fd.
* Note that for ioctl O_RDONLY is sufficient.
*/
int FAST_FUNC xopen_nonblocking(const char *pathname)
{
return xopen(pathname, O_RDONLY | O_NONBLOCK);
}
int FAST_FUNC xopen_as_uid_gid(const char *pathname, int flags, uid_t u, gid_t g)
{
int fd;
uid_t old_euid = geteuid();
gid_t old_egid = getegid();
xsetegid(g);
xseteuid(u);
fd = xopen(pathname, flags);
xseteuid(old_euid);
xsetegid(old_egid);
return fd;
}
void FAST_FUNC xunlink(const char *pathname)
{
if (unlink(pathname))
@@ -351,6 +368,16 @@ void FAST_FUNC xsetuid(uid_t uid)
if (setuid(uid)) bb_perror_msg_and_die("setuid");
}
void FAST_FUNC xsetegid(gid_t egid)
{
if (setegid(egid)) bb_perror_msg_and_die("setegid");
}
void FAST_FUNC xseteuid(uid_t euid)
{
if (seteuid(euid)) bb_perror_msg_and_die("seteuid");
}
// Die if we can't chdir to a new path.
void FAST_FUNC xchdir(const char *path)
{