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Annotation of 43BSD/contrib/mh/sbr/m_update.c, revision 1.1

1.1     ! root        1: /* m_update.c - update the profile */
        !             2: 
        !             3: #include "../h/mh.h"
        !             4: #include <stdio.h>
        !             5: #include <signal.h>
        !             6: 
        !             7: 
        !             8: void m_update () {
        !             9:     int     action;
        !            10:     int     (*hstat) (), (*istat) (), (*qstat) (), (*tstat) ();
        !            11:     register struct node   *np;
        !            12:     FILE * out;
        !            13: 
        !            14:     if (!(ctxflags & CTXMOD))
        !            15:        return;
        !            16:     ctxflags &= ~CTXMOD;
        !            17: 
        !            18:     if ((action = m_chkids ()) > OK)
        !            19:        return;                 /* child did it for us */
        !            20: 
        !            21:     hstat = signal (SIGHUP, SIG_IGN);
        !            22:     istat = signal (SIGINT, SIG_IGN);
        !            23:     qstat = signal (SIGQUIT, SIG_IGN);
        !            24:     tstat = signal (SIGTERM, SIG_IGN);
        !            25: 
        !            26:     if ((out = fopen (ctxpath, "w")) == NULL)
        !            27:        adios (ctxpath, "unable to write");
        !            28:     for (np = m_defs; np; np = np -> n_next)
        !            29:        if (np -> n_context)
        !            30:            fprintf (out, "%s: %s\n", np -> n_name, np -> n_field);
        !            31:     (void) fclose (out);
        !            32: 
        !            33:     (void) signal (SIGHUP, hstat);
        !            34:     (void) signal (SIGINT, istat);
        !            35:     (void) signal (SIGQUIT, qstat);
        !            36:     (void) signal (SIGTERM, tstat);
        !            37:     if (action == OK)
        !            38:        _exit (0);              /* we are child, time to die */
        !            39: }
        !            40: 
        !            41: /*  */
        !            42: 
        !            43: /* This hack brought to you so we can handle set[ug]id MH programs.  If we
        !            44:    return NOTOK, then no fork is made, we update .mh_profile normally, and
        !            45:    return to the caller normally.  If we return 0, then the child is
        !            46:    executing, .mh_profile is modified after we set our [ug]ids to the norm.
        !            47:    If we return > 0, then the parent is executed and .mh_profile has
        !            48:    already be modified.  We can just return to the caller immediately. */
        !            49: 
        !            50: 
        !            51: static int  m_chkids () {
        !            52:     int     i,
        !            53:             child_id;
        !            54: 
        !            55:     if (getuid () == geteuid ())
        !            56:        return (NOTOK);
        !            57: 
        !            58:     for (i = 0; (child_id = fork ()) == -1 && i < 5; i++)
        !            59:        sleep (5);
        !            60:     switch (child_id) {
        !            61:        case NOTOK:
        !            62:            break;
        !            63: 
        !            64:        case OK:
        !            65:            (void) setgid (getgid ());
        !            66:            (void) setuid (getuid ());
        !            67:            break;
        !            68: 
        !            69:        default:
        !            70:            (void) pidwait (child_id, NOTOK);
        !            71:            break;
        !            72:     }
        !            73: 
        !            74:     return child_id;
        !            75: }

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