appl/dceutils/testpag.c

   1 /* Test the k5dcepag routine by setting a pag, and
   2  * and execing a shell under this pag.
   3  *
   4  * This allows you to join a PAG which was created
   5  * earlier by some other means.
   6  * for example k5dcecon
   7  *
   8  * Must be run as root for testing only.
   9  *
  10  */
  11
  12 #include <stdio.h>
  13 #include <sys/stat.h>
  14 #include <sys/wait.h>
  15 #include <fcntl.h>
  16 #include <signal.h>
  17 #include <setjmp.h>
  18 #include <errno.h>
  19
  20 #define POSIX_SETJMP
  21 #define POSIX_SIGNALS
  22
  23 #ifdef POSIX_SIGNALS
  24 typedef struct sigaction handler;
  25 #define handler_init(H,F)       (sigemptyset(&(H).sa_mask), \
  26                      (H).sa_flags=0, \
  27                      (H).sa_handler=(F))
  28 #define handler_swap(S,NEW,OLD)     sigaction(S, &NEW, &OLD)
  29 #define handler_set(S,OLD)      sigaction(S, &OLD, NULL)
  30 #else
  31 typedef sigtype (*handler)();
  32 #define handler_init(H,F)       ((H) = (F))
  33 #define handler_swap(S,NEW,OLD)     ((OLD) = signal ((S), (NEW)))
  34
  35 #define handler_set(S,OLD)      (signal ((S), (OLD)))
  36 #endif
  37
  38 typedef void sigtype;
  39
  40 /*
  41  * We could include the dcedfs/syscall.h which should have these
  42  * numbers, but it has extra baggage. So for
  43  * simplicity sake now, we define these here.
  44  */
  45
  46
  47 #define AFSCALL_SETPAG 2
  48 #define AFSCALL_GETPAG 11
  49
  50 #if defined(sun)
  51 #define AFS_SYSCALL  72
  52
  53 #elif defined(hpux)
  54 /* assume HPUX 10 +  or is it 50 */
  55 #define AFS_SYSCALL 326
  56
  57 #elif defined(_AIX)
  58 #define DPAGAIX "dpagaix"
  59 /* #define DPAGAIX "/krb5/sbin/dpagaix" */
  60
  61 #elif defined(sgi) || defined(_sgi)
  62 #define AFS_SYSCALL  206+1000
  63
  64 #else
  65 #define AFS_SYSCALL (Unknown_DFS_AFS_SYSCALL)
  66 #endif
  67
  68 static sigjmp_buf setpag_buf;
  69
  70 static sigtype mysig()
  71 {
  72   siglongjmp(setpag_buf, 1);
  73 }
  74
  75
  76 int  krb5_dfs_newpag(new_pag)
  77   int new_pag;
  78 {
  79   handler sa1, osa1;
  80   handler sa2, osa2;
  81   int pag = -1;
  82
  83   handler_init (sa1, mysig);
  84   handler_init (sa2, mysig);
  85   handler_swap (SIGSYS, sa1, osa1);
  86   handler_swap (SIGSEGV, sa2, osa2);
  87
  88   if (sigsetjmp(setpag_buf, 1) == 0) {
  89 #if defined(_AIX)
  90     int (*dpagaix)(int, int, int, int, int, int);
  91
  92     if (dpagaix = load(DPAGAIX, 0, 0))
  93       pag = (*dpagaix)(AFSCALL_SETPAG, new_pag, 0, 0, 0, 0);
  94 #else
  95     pag = syscall(AFS_SYSCALL,AFSCALL_SETPAG, new_pag, 0, 0, 0, 0);
  96 #endif
  97     handler_set (SIGSYS, osa1);
  98     handler_set (SIGSEGV, osa2);
  99     return(pag);
 100   }
 101
 102   fprintf(stderr,"Setpag failed with a system error\n");
 103   /* syscall failed! return 0 */
 104   handler_set (SIGSYS, osa1);
 105   handler_set (SIGSEGV, osa2);
 106   return(-1);
 107 }
 108
 109 main(argc, argv)
 110         int argc;
 111         char *argv[];
 112 {
 113   extern int optind;
 114   extern char *optarg;
 115   int rv;
 116   int rc;
 117   unsigned int pag;
 118   unsigned int newpag = 0;
 119   char ccname[256];
 120   int nflag = 0;
 121
 122   while((rv = getopt(argc,argv,"n:")) != -1) {
 123     switch(rv) {
 124      case 'n':
 125        nflag++;
 126        sscanf(optarg,"%8x",&newpag);
 127        break;
 128      default:
 129        printf("Usage: k5dcepagt -n pag \n");
 130        exit(1);
 131     }
 132   }
 133
 134   if (nflag) {
 135     fprintf (stderr,"calling k5dcepag newpag=%8.8x\n",newpag);
 136     pag = krb5_dfs_newpag(newpag);
 137
 138     fprintf (stderr,"PAG returned = %8.8x\n",pag);
 139     if ((pag != 0) && (pag != -1)) {
 140       sprintf (ccname,
 141         "FILE:/opt/dcelocal/var/security/creds/dcecred_%8.8x",
 142         pag);
 143       esetenv("KRB5CCNAME",ccname,1);
 144       execl("/bin/csh", "csh", NULL);
 145     }
 146     else {
 147       fprintf(stderr," Not a good pag value\n");
 148     }
 149   }
 150 }