c954ee8a10
- If you have Gnome installed on solaris, the GETRES support wouldn't build. I don't have access to a solaris system with Gnome installed, but hacked unixconf.h to force the GETRES code itself to be compiled. So, I believe the unixres.c change will work for folks really using Gnome on Solaris. Whether the rest of the gnome code will build there is beyond me. - I accidentally left TIMED_DELAY defined and the Solaris build failed. While solaris has usleep(), this is not part of SVR4 as far as I can tell. But, SysV does have poll, so I implemented msleep() for SysV systems in terms of poll. So, you can now define TIMED_DELAY on any SYSV build.
210 lines
3.8 KiB
C
210 lines
3.8 KiB
C
/* SCCS Id: @(#)unixres.c 3.4 2001/07/08 */
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/* Copyright (c) Slash'EM development team, 2001. */
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/* NetHack may be freely redistributed. See license for details. */
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/* [ALI] This module defines nh_xxx functions to replace getuid etc which
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* will hide privileges from the caller if so desired.
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*
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* Currently supported UNIX variants:
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* Linux version 2.1.44 and above
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* FreeBSD (versions unknown)
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*
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* Note: SunOS and Solaris have no mechanism for retrieving the saved id,
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* so temporarily dropping privileges on these systems is sufficient to
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* hide them.
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*/
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#include "config.h"
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#ifdef GETRES_SUPPORT
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# if defined(LINUX)
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/* requires dynamic linking with libc */
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#include <dlfcn.h>
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static int
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real_getresuid(ruid, euid, suid)
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uid_t *ruid, *euid, *suid;
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{
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int (*f)(uid_t *, uid_t *, uid_t *); /* getresuid signature */
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f = dlsym(RTLD_NEXT, "getresuid");
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if (!f) return -1;
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return f(ruid, euid, suid);
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}
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static int
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real_getresgid(rgid, egid, sgid)
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gid_t *rgid, *egid, *sgid;
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{
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int (*f)(gid_t *, gid_t *, gid_t *); /* getresgid signature */
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f = dlsym(RTLD_NEXT, "getresgid");
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if (!f) return -1;
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return f(rgid, egid, sgid);
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}
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# else
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# if defined(BSD) || defined(SVR4)
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# ifdef SYS_getresuid
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static int
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real_getresuid(ruid, euid, suid)
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uid_t *ruid, *euid, *suid;
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{
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return syscall(SYS_getresuid, ruid, euid, suid);
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}
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# else /* SYS_getresuid */
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#ifdef SVR4
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#include <sys/stat.h>
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#endif /* SVR4 */
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static int
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real_getresuid(ruid, euid, suid)
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uid_t *ruid, *euid, *suid;
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{
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int retval;
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int pfd[2];
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struct stat st;
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if (pipe(pfd))
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return -1;
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retval = fstat(pfd[0], &st);
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close(pfd[0]);
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close(pfd[1]);
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if (!retval) {
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*euid = st.st_uid;
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*ruid = syscall(SYS_getuid);
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*suid = *ruid; /* Not supported under SVR4 */
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}
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return retval;
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}
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# endif /* SYS_getresuid */
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# ifdef SYS_getresgid
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static int
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real_getresgid(rgid, egid, sgid)
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gid_t *rgid, *egid, *sgid;
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{
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return syscall(SYS_getresgid, rgid, egid, sgid);
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}
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# else /* SYS_getresgid */
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static int
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real_getresgid(rgid, egid, sgid)
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gid_t *rgid, *egid, *sgid;
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{
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int retval;
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int pfd[2];
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struct stat st;
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if (pipe(pfd))
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return -1;
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retval = fstat(pfd[0], &st);
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close(pfd[0]);
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close(pfd[1]);
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if (!retval) {
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*egid = st.st_gid;
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*rgid = syscall(SYS_getgid);
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*sgid = *rgid; /* Not supported under SVR4 */
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}
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return retval;
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}
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# endif /* SYS_getresgid */
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# endif /* BSD || SVR4 */
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# endif /* LINUX */
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static unsigned int hiding_privileges = 0;
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/*
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* Note: returns the value _after_ action.
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*/
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int
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hide_privileges(flag)
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boolean flag;
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{
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if (flag)
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hiding_privileges++;
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else if (hiding_privileges)
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hiding_privileges--;
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return hiding_privileges;
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}
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int
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nh_getresuid(ruid, euid, suid)
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uid_t *ruid, *euid, *suid;
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{
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int retval = real_getresuid(ruid, euid, suid);
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if (!retval && hiding_privileges)
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*euid = *suid = *ruid;
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return retval;
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}
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uid_t
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nh_getuid()
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{
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uid_t ruid, euid, suid;
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(void) real_getresuid(&ruid, &euid, &suid);
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return ruid;
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}
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uid_t
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nh_geteuid()
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{
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uid_t ruid, euid, suid;
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(void) real_getresuid(&ruid, &euid, &suid);
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if (hiding_privileges)
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euid = ruid;
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return euid;
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}
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int
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nh_getresgid(rgid, egid, sgid)
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gid_t *rgid, *egid, *sgid;
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{
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int retval = real_getresgid(rgid, egid, sgid);
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if (!retval && hiding_privileges)
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*egid = *sgid = *rgid;
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return retval;
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}
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gid_t
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nh_getgid()
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{
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gid_t rgid, egid, sgid;
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(void) real_getresgid(&rgid, &egid, &sgid);
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return rgid;
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}
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gid_t
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nh_getegid()
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{
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gid_t rgid, egid, sgid;
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(void) real_getresgid(&rgid, &egid, &sgid);
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if (hiding_privileges)
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egid = rgid;
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return egid;
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}
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#else /* GETRES_SUPPORT */
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# ifdef GNOME_GRAPHICS
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int
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hide_privileges(flag)
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boolean flag;
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{
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return 0;
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}
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# endif
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#endif /* GETRES_SUPPORT */
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