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1 /* m_update.c - update the profile */
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2 #ifndef lint
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3 static char ident[] = "@(#)$Id$";
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4 #endif /* lint */
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5
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6 #include "../h/mh.h"
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7 #include <stdio.h>
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8 #include <signal.h>
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9 #ifndef sigmask
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10 #define sigmask(s) (1 << ((s) - 1))
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11 #endif /* not sigmask */
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12
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13 static int m_chkids();
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14
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15 void m_update () {
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16 int action;
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17 #ifndef BSD42
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18 TYPESIG (*hstat) (), (*istat) (), (*qstat) (), (*tstat) ();
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19 #else /* BSD42 */
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20 int smask;
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21 #endif /* BSD42 */
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22 register struct node *np;
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23 FILE * out;
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24
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25 if (!(ctxflags & CTXMOD))
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26 return;
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27 ctxflags &= ~CTXMOD;
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28
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29 if ((action = m_chkids ()) > OK)
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30 return; /* child did it for us */
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31
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32 #ifndef BSD42
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33 hstat = signal (SIGHUP, SIG_IGN);
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34 istat = signal (SIGINT, SIG_IGN);
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35 qstat = signal (SIGQUIT, SIG_IGN);
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36 tstat = signal (SIGTERM, SIG_IGN);
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37 #else /* BSD42 */
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38 smask = sigblock (sigmask (SIGHUP) | sigmask (SIGINT)
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39 | sigmask (SIGQUIT) | sigmask (SIGTERM));
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40 #endif /* BSD42 */
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41
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42 if ((out = fopen (ctxpath, "w")) == NULL)
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43 adios (ctxpath, "unable to write");
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44 for (np = m_defs; np; np = np -> n_next)
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45 if (np -> n_context)
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46 fprintf (out, "%s: %s\n", np -> n_name, np -> n_field);
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47 (void) fclose (out);
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48
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49 #ifndef BSD42
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50 (void) signal (SIGHUP, hstat);
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51 (void) signal (SIGINT, istat);
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52 (void) signal (SIGQUIT, qstat);
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53 (void) signal (SIGTERM, tstat);
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54 #else /* BSD42 */
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55 (void) sigsetmask (smask);
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56 #endif /* BSD42 */
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57 if (action == OK)
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58 _exit (0); /* we are child, time to die */
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59 }
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60
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61 /* */
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62
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63 /* This hack brought to you so we can handle set[ug]id MH programs. If we
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64 return NOTOK, then no fork is made, we update .mh_profile normally, and
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65 return to the caller normally. If we return 0, then the child is
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66 executing, .mh_profile is modified after we set our [ug]ids to the norm.
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67 If we return > 0, then the parent is executed and .mh_profile has
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68 already be modified. We can just return to the caller immediately. */
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69
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70
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71 static int m_chkids () {
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72 int i,
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73 child_id;
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74
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75 if (getuid () == geteuid ())
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76 return (NOTOK);
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77
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78 for (i = 0; (child_id = fork ()) == -1 && i < 5; i++)
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79 sleep (5);
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80 switch (child_id) {
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81 case NOTOK:
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82 break;
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83
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84 case OK:
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85 (void) setgid (getgid ());
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86 (void) setuid (getuid ());
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87 break;
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88
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89 default:
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90 (void) pidwait (child_id, NOTOK);
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91 break;
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92 }
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93
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94 return child_id;
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95 }
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