tests/testipc.c

   1 // $Id: testipc.c,v 1.2 2004/01/13 14:56:26 ensc Exp $
   2
   3 // Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
   4 // based on tests/testipc.cc by Jacques Gelinas
   5 //
   6 // This program is free software; you can redistribute it and/or modify
   7 // it under the terms of the GNU General Public License as published by
   8 // the Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10 //
  11 // This program is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License
  17 // along with this program; if not, write to the Free Software
  18 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19
  20 /*
  21         Test to see isolation of the various IPC resources
  22         between security context
  23 */
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <errno.h>
  27 #include <stdlib.h>
  28 #include <sys/ipc.h>
  29 #include <sys/shm.h>
  30 #include <sys/sem.h>
  31
  32 int main (int argc, char *argv[])
  33 {
  34         int ret = -1;
  35         if (argc < 2){
  36                 fprintf (stderr,
  37                         "testipc createshm\n"
  38                         );
  39         }else if(strcmp(argv[1],"createshm")==0){
  40                 int id = shmget (1,1024,IPC_CREAT|0666);
  41                 if (id == -1){
  42                         fprintf (stderr,"shmget failed (%s)\n",strerror(errno));
  43                 }else{
  44                         void *pt = shmat (id,NULL,0);
  45                         printf ("shmget id %d\n",id);
  46                         if (pt == NULL){
  47                                 fprintf (stderr,"can't shmat to id %d (%s)\n",id,strerror(errno));
  48                         }else{
  49                                 char tmp[100];
  50                                 int  ok;
  51                                 strcpy ((char*)pt,"original string");
  52
  53                                 printf ("Letting a sub-program attach to this memory\n");
  54                                 sprintf (tmp,"./testipc accessshm %d",id);
  55                                 ok = system (tmp);
  56                                 printf ("\tSub-program returned %d\n",ok);
  57
  58                                 printf ("\tThe segment now hold :%s:\n",(char*)pt);
  59                                 shmdt (pt);
  60
  61                                 printf ("A sub-program in another context can't attach\n");
  62                                 sprintf (tmp,"/usr/sbin/chcontext ./testipc accessshm %d",id);
  63                                 ok = system (tmp);
  64                                 printf ("\tSub-program returned %d\n",ok);
  65
  66                                 printf ("Executing a sub-shell\n");
  67                                 system ("/bin/sh");
  68                         }
  69                         printf ("Delete the share memory segment\n");
  70                         if (shmctl (id,IPC_RMID,NULL)==-1){
  71                                 fprintf (stderr,"shmctl failed (%s)\n",strerror(errno));
  72                         }else{
  73                                 ret = 0;
  74                         }
  75                 }
  76         }else if(strcmp(argv[1],"accessshm")==0){
  77                 int id = atoi(argv[2]);
  78                 void *pt = shmat (id,NULL,0);
  79                 if (pt == (void*)-1){
  80                         fprintf (stderr,"can't shmat to id %d (%s)\n",id,strerror(errno));
  81                 }else{
  82                         printf ("\tWriting hello in share memory\n");
  83                         strcpy ((char*)pt,"hello");
  84                         ret = 0;
  85                 }
  86         }else if(strcmp(argv[1],"createsem")==0){
  87                 int id = semget (1,1,IPC_CREAT|0666);
  88                 if (id == -1){
  89                         fprintf (stderr,"semget failed (%s)\n",strerror(errno));
  90                 }else{
  91                         char tmp[100];
  92                         int  ok;
  93                         printf ("semget id %d\n",id);
  94
  95                         printf ("Letting a sub-program play with this semaphore\n");
  96                         sprintf (tmp,"./testipc accesssem %d",id);
  97                         ok = system (tmp);
  98                         printf ("\tSub-program returned %d\n",ok);
  99
 100                         printf ("A sub-program in another context can't use the semaphore\n");
 101                         sprintf (tmp,"/usr/sbin/chcontext ./testipc accesssem %d",id);
 102                         ok = system (tmp);
 103                         printf ("\tSub-program returned %d\n",ok);
 104
 105                         printf ("Executing a sub-shell\n");
 106                         system ("/bin/sh");
 107
 108                         printf ("Delete the semaphore\n");
 109                         if (semctl (id,0,IPC_RMID,NULL)==-1){
 110                                 fprintf (stderr,"semctl failed (%s)\n",strerror(errno));
 111                         }else{
 112                                 ret = 0;
 113                         }
 114                 }
 115         }else if(strcmp(argv[1],"accesssem")==0){
 116                 int id = atoi(argv[2]);
 117                 struct sembuf ops[]={
 118                         {0,0,0}
 119                 };
 120                 if (semop (id,ops,1) == -1){
 121                         fprintf (stderr,"can't semop with id %d (%s)\n",id,strerror(errno));
 122                 }else{
 123                         ret = 0;
 124                 }
 125         }
 126         return ret;
 127 }
 128
 129