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[unix-history] / usr / src / sys / kern / kern_prot.c

/*      kern_prot.c     5.9     82/10/17        */

/*
* System calls related to processes and protection
*/

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/dir.h"
#include "../h/user.h"
#include "../h/reg.h"
#include "../h/inode.h"
#include "../h/proc.h"
#include "../h/timeb.h"
#include "../h/times.h"
#include "../h/reboot.h"
#include "../h/fs.h"
#include "../h/conf.h"
#include "../h/buf.h"
#include "../h/mount.h"
#include "../h/quota.h"

getpid()
{

       u.u_r.r_val1 = u.u_procp->p_pid;
       u.u_r.r_val2 = u.u_procp->p_ppid;
}

getpgrp()
{
       register struct a {
               int     pid;
       } *uap = (struct a *)u.u_ap;
       register struct proc *p;

       if (uap->pid == 0)
               uap->pid = u.u_procp->p_pid;
       p = pfind(uap->pid);
       if (p == 0) {
               u.u_error = ESRCH;
               return;
       }
       u.u_r.r_val1 = p->p_pgrp;
}

getuid()
{

       u.u_r.r_val1 = u.u_ruid;
       u.u_r.r_val2 = u.u_uid;
}

getgid()
{

       u.u_r.r_val1 = u.u_rgid;
       u.u_r.r_val2 = u.u_gid;
}

getgroups()
{
       register struct a {
               u_int   gidsetsize;
               int     *gidset;
       } *uap = (struct a *)u.u_ap;
       register int *gp;

       for (gp = &u.u_groups[NGROUPS]; gp > u.u_groups; gp--)
               if (gp[-1] >= 0)
                       break;
       if (uap->gidsetsize < gp - u.u_groups) {
               u.u_error = EINVAL;
               return;
       }
       uap->gidsetsize = gp - u.u_groups;
       if (copyout((caddr_t)u.u_groups, (caddr_t)uap->gidset,
           uap->gidsetsize * sizeof (u.u_groups[0]))) {
               u.u_error = EFAULT;
               return;
       }
       u.u_r.r_val1 = uap->gidsetsize;
}

setpgrp()
{
       register struct proc *p;
       register struct a {
               int     pid;
               int     pgrp;
       } *uap = (struct a *)u.u_ap;

       if (uap->pid == 0)
               uap->pid = u.u_procp->p_pid;
       p = pfind(uap->pid);
       if (p == 0) {
               u.u_error = ESRCH;
               return;
       }
/* need better control mechanisms for process groups */
       if (p->p_uid != u.u_uid && u.u_uid && !inferior(p)) {
               u.u_error = EPERM;
               return;
       }
       p->p_pgrp = uap->pgrp;
}

setuid()
{
       register uid;
       register struct a {
               int     uid;
       } *uap;

       uap = (struct a *)u.u_ap;
       uid = uap->uid;
       if (u.u_ruid == uid || u.u_uid == uid || suser()) {
#ifdef QUOTA
               if (u.u_quota->q_uid != uid) {
                       qclean();
                       qstart(getquota(uid, 0, 0));
               }
#endif
               u.u_uid = uid;
               u.u_procp->p_uid = uid;
               u.u_ruid = uid;
       }
}

setgid()
{
       register gid;
       register struct a {
               int     gid;
       } *uap;

       uap = (struct a *)u.u_ap;
       gid = uap->gid;
       if (u.u_rgid == gid || u.u_gid == gid || suser()) {
               leavegroup(u.u_gid); leavegroup(u.u_rgid);
               (void) entergroup(gid);
               u.u_gid = gid;
               u.u_rgid = gid;
       }
}

setgroups()
{
       register struct a {
               u_int   gidsetsize;
               int     *gidset;
       } *uap = (struct a *)u.u_ap;
       register int *gp;

       if (!suser())
               return;
       if (uap->gidsetsize > sizeof (u.u_groups) / sizeof (u.u_groups[0])) {
               u.u_error = EINVAL;
               return;
       }
       if (copyin((caddr_t)uap->gidset, (caddr_t)u.u_groups,
           uap->gidsetsize * sizeof (u.u_groups[0]))) {
               u.u_error = EFAULT;
               return;
       }
       for (gp = &u.u_groups[uap->gidsetsize]; gp < &u.u_groups[NGROUPS]; gp++)
               *gp = -1;
}

/*
* Pid of zero implies current process.
* Pgrp -1 is getpgrp system call returning
* current process group.
*/
osetpgrp()
{
       register struct proc *p;
       register struct a {
               int     pid;
               int     pgrp;
       } *uap;

       uap = (struct a *)u.u_ap;
       if (uap->pid == 0)
               p = u.u_procp;
       else {
               p = pfind(uap->pid);
               if (p == 0) {
                       u.u_error = ESRCH;
                       return;
               }
       }
       if (uap->pgrp <= 0) {
               u.u_r.r_val1 = p->p_pgrp;
               return;
       }
       if (p->p_uid != u.u_uid && u.u_uid && !inferior(p)) {
               u.u_error = EPERM;
               return;
       }
       p->p_pgrp = uap->pgrp;
}
/* END DEFUNCT */

leavegroup(gid)
       int gid;
{
       register int *gp;

       for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++)
               if (*gp == gid)
                       goto found;
       return;
found:
       for (; gp < &u.u_groups[NGROUPS-1]; gp++)
               *gp = *(gp+1);
       *gp = -1;
}

entergroup(gid)
       int gid;
{
       register int *gp;

       for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++)
               if (*gp == gid)
                       return (0);
       for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++)
               if (*gp < 0) {
                       *gp = gid;
                       return (0);
               }
       return (-1);
}