test/test20.c

   1 /* test20: fcntl()              Author: Jan-Mark Wams (jms@cs.vu.nl) */
   2
   3 /* Some things have to be checked for ``exec()'' call's. Therefor
   4 ** there is a check routine called ``do_check()'' that will be
   5 ** called if the first argument (``argv[0]'') equals ``DO CHECK.''
   6 ** Note that there is no way the shell (``/bin/sh'') will set
   7 ** ``argv[0]'' to this funny value. (Unless we rename ``test20''
   8 ** to ``DO CHECK'' ;-)
   9 */
  10
  11 #include <sys/types.h>
  12 #include <sys/stat.h>
  13 #include <sys/wait.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <string.h>
  17 #include <fcntl.h>
  18 #include <limits.h>
  19 #include <errno.h>
  20 #include <time.h>
  21 #include <stdio.h>
  22
  23 #define MAX_ERROR       4
  24 #define ITERATIONS     10
  25
  26 #define System(cmd)     if (system(cmd) != 0) printf("``%s'' failed\n", cmd)
  27 #define Chdir(dir)      if (chdir(dir) != 0) printf("Can't goto %s\n", dir)
  28 #define Stat(a,b)       if (stat(a,b) != 0) printf("Can't stat %s\n", a)
  29
  30 #include "common.c"
  31
  32 int superuser;
  33
  34 void test20a(void);
  35 void test20b(void);
  36 void test20c(void);
  37 void test20d(void);
  38 int do_check(void);
  39
  40 char executable[1024];
  41
  42 int main(int argc, char *argv[])
  43 {
  44   int i;
  45
  46   sync();
  47   /* If we have to check things, call do_check(). */
  48   if (strcmp(argv[0], "DO CHECK") == 0) exit(do_check());
  49
  50   /* Get the path of the executable. */
  51   strcpy(executable, "../");
  52   strcat(executable, argv[0]);
  53
  54   start(20);
  55   superuser = (geteuid() == 0);
  56
  57   for (i = 0; i < ITERATIONS; i++) {
  58         test20a();
  59         test20b();
  60         test20c();
  61         test20d();
  62   }
  63   quit();
  64
  65   return(-1);   /* Unreachable */
  66 }
  67
  68 void test20a()
  69 {                               /* Test normal operation. */
  70   subtest = 1;
  71   System("rm -rf ../DIR_20/*");
  72 }
  73
  74 void test20b()
  75 {
  76   subtest = 2;
  77   System("rm -rf ../DIR_20/*");
  78 }
  79
  80 void test20c()
  81 {
  82   subtest = 3;
  83   System("rm -rf ../DIR_20/*");
  84 }
  85
  86 /* Open fds 3, 4, 5 and 6. Set FD_CLOEXEC on 5 and 6. Exclusively lock the
  87 ** first 10 bytes of fd no. 3. Shared lock fd no. 7. Lock fd no. 8 after
  88 ** the fork. Do a ``exec()'' call with a funny argv[0] and check the return
  89 ** value.
  90 */
  91 void test20d()
  92 {                               /* Test locks with ``fork()'' and ``exec().'' */
  93   int fd3, fd4, fd5, fd6, fd7, fd8;
  94   int stat_loc;
  95   int do_check_retval;
  96   char *argv[2];
  97   struct flock fl;
  98
  99   subtest = 4;
 100
 101   argv[0] = "DO CHECK";
 102   argv[1] = (char *) NULL;
 103
 104   fl.l_whence = SEEK_SET;
 105   fl.l_start = 0;
 106   fl.l_len = 10;
 107
 108   /* Make a dummy files and open them. */
 109   System("echo 'Great Balls Of Fire!' > file3");
 110   System("echo 'Great Balls Of Fire!' > file4");
 111   System("echo 'Great Balls Of Fire!' > file7");
 112   System("echo 'Great Balls Of Fire!' > file8");
 113   System("echo 'Great Balls Of Fire!' > file");
 114   if ((fd3 = open("file3", O_RDWR)) != 3) e(1);
 115   if ((fd4 = open("file4", O_RDWR)) != 4) e(2);
 116   if ((fd5 = open("file", O_RDWR)) != 5) e(3);
 117   if ((fd6 = open("file", O_RDWR)) != 6) e(4);
 118   if ((fd7 = open("file7", O_RDWR)) != 7) e(5);
 119   if ((fd8 = open("file8", O_RDWR)) != 8) e(6);
 120
 121   /* Set FD_CLOEXEC flags on fd5 and fd6. */
 122   if (fcntl(fd5, F_SETFD, FD_CLOEXEC) == -1) e(7);
 123   if (fcntl(fd6, F_SETFD, FD_CLOEXEC) == -1) e(8);
 124
 125   /* Lock the first ten bytes from fd3 (for writing). */
 126   fl.l_type = F_WRLCK;
 127   if (fcntl(fd3, F_SETLK, &fl) == -1) e(9);
 128
 129   /* Lock (for reading) fd7. */
 130   fl.l_type = F_RDLCK;
 131   if (fcntl(fd7, F_SETLK, &fl) == -1) e(10);
 132
 133   switch (fork()) {
 134       case -1:  printf("Can't fork\n"); break;
 135       case 0:
 136         alarm(20);
 137
 138         /* Lock fd8. */
 139         fl.l_type = F_WRLCK;
 140         if (fcntl(fd8, F_SETLK, &fl) == -1) e(11);
 141
 142         /* Check the lock on fd3 and fd7. */
 143         fl.l_type = F_WRLCK;
 144         if (fcntl(fd3, F_GETLK, &fl) == -1) e(12);
 145         if (fl.l_type != F_WRLCK) e(13);
 146         if (fl.l_pid != getppid()) e(14);
 147         fl.l_type = F_WRLCK;
 148         if (fcntl(fd7, F_GETLK, &fl) == -1) e(15);
 149         if (fl.l_type != F_RDLCK) e(16);
 150         if (fl.l_pid != getppid()) e(17);
 151
 152         /* Check FD_CLOEXEC flags. */
 153         if ((fcntl(fd3, F_GETFD) & FD_CLOEXEC) != 0) e(18);
 154         if ((fcntl(fd4, F_GETFD) & FD_CLOEXEC) != 0) e(19);
 155         if ((fcntl(fd5, F_GETFD) & FD_CLOEXEC) != FD_CLOEXEC) e(20);
 156         if ((fcntl(fd6, F_GETFD) & FD_CLOEXEC) != FD_CLOEXEC) e(21);
 157         if ((fcntl(fd7, F_GETFD) & FD_CLOEXEC) != 0) e(22);
 158         if ((fcntl(fd8, F_GETFD) & FD_CLOEXEC) != 0) e(23);
 159
 160         execlp(executable + 3, "DO CHECK", (char *) NULL);
 161         execlp(executable, "DO CHECK", (char *) NULL);
 162         printf("Can't exec %s or %s\n", executable + 3, executable);
 163         exit(0);
 164
 165       default:
 166         wait(&stat_loc);
 167         if (WIFSIGNALED(stat_loc)) e(24);       /* Alarm? */
 168         if (WIFEXITED(stat_loc) == 0) {
 169                 errct=10000;
 170                 quit();
 171         }
 172   }
 173
 174   /* Check the return value of do_check(). */
 175   do_check_retval = WEXITSTATUS(stat_loc);
 176   if ((do_check_retval & 0x11) == 0x11) e(25);
 177   if ((do_check_retval & 0x12) == 0x12) e(26);
 178   if ((do_check_retval & 0x14) == 0x14) e(27);
 179   if ((do_check_retval & 0x18) == 0x18) e(28);
 180   if ((do_check_retval & 0x21) == 0x21) e(29);
 181   if ((do_check_retval & 0x22) == 0x22) e(30);
 182   if ((do_check_retval & 0x24) == 0x24) e(31);
 183   if ((do_check_retval & 0x28) == 0x28) e(32);
 184   if ((do_check_retval & 0x41) == 0x41) e(33);
 185   if ((do_check_retval & 0x42) == 0x42) e(34);
 186   if ((do_check_retval & 0x44) == 0x44) e(35);
 187   if ((do_check_retval & 0x48) == 0x48) e(36);
 188   if ((do_check_retval & 0x81) == 0x81) e(37);
 189   if ((do_check_retval & 0x82) == 0x82) e(38);
 190   if ((do_check_retval & 0x84) == 0x84) e(39);
 191   if ((do_check_retval & 0x88) == 0x88) e(40);
 192
 193   switch (fork()) {
 194       case -1:  printf("Can't fork\n"); break;
 195       case 0:
 196         alarm(20);
 197
 198         /* Lock fd8. */
 199         fl.l_type = F_WRLCK;
 200         if (fcntl(fd8, F_SETLK, &fl) == -1) e(41);
 201
 202         execvp(executable + 3, argv);
 203         execvp(executable, argv);
 204         printf("Can't exec %s or %s\n", executable + 3, executable);
 205         exit(0);
 206
 207       default:
 208         wait(&stat_loc);
 209         if (WIFSIGNALED(stat_loc)) e(48);       /* Alarm? */
 210   }
 211
 212   /* Check the return value of do_check(). */
 213   do_check_retval = WEXITSTATUS(stat_loc);
 214   if ((do_check_retval & 0x11) == 0x11) e(49);
 215   if ((do_check_retval & 0x12) == 0x12) e(50);
 216   if ((do_check_retval & 0x14) == 0x14) e(51);
 217   if ((do_check_retval & 0x18) == 0x18) e(52);
 218   if ((do_check_retval & 0x21) == 0x21) e(53);
 219   if ((do_check_retval & 0x22) == 0x22) e(54);
 220   if ((do_check_retval & 0x24) == 0x24) e(55);
 221   if ((do_check_retval & 0x28) == 0x28) e(56);
 222   if ((do_check_retval & 0x41) == 0x41) e(57);
 223   if ((do_check_retval & 0x42) == 0x42) e(58);
 224   if ((do_check_retval & 0x44) == 0x44) e(59);
 225   if ((do_check_retval & 0x48) == 0x48) e(60);
 226   if ((do_check_retval & 0x81) == 0x81) e(61);
 227   if ((do_check_retval & 0x82) == 0x82) e(62);
 228   if ((do_check_retval & 0x84) == 0x84) e(63);
 229   if ((do_check_retval & 0x88) == 0x88) e(64);
 230
 231   fl.l_type = F_UNLCK;
 232   if (fcntl(fd3, F_SETLK, &fl) == -1) e(65);
 233   if (fcntl(fd7, F_SETLK, &fl) == -1) e(66);
 234
 235   if (close(fd3) != 0) e(67);
 236   if (close(fd4) != 0) e(68);
 237   if (close(fd5) != 0) e(69);
 238   if (close(fd6) != 0) e(70);
 239   if (close(fd7) != 0) e(71);
 240   if (close(fd8) != 0) e(72);
 241
 242   System("rm -f ../DIR_20/*\n");
 243 }
 244
 245 /* This routine checks that fds 0 through 4, 7 and 8 are open and the rest
 246 ** is closed. It also checks if we can lock the first 10 bytes on fd no. 3
 247 ** and 4. It should not be possible to lock fd no. 3, but it should be
 248 ** possible to lock fd no. 4. See ``test20d()'' for usage of this routine.
 249 */
 250 int do_check()
 251 {
 252   int i;
 253   int retval = 0;
 254   struct flock fl;
 255
 256   fl.l_whence = SEEK_SET;
 257   fl.l_start = 0;
 258   fl.l_len = 10;
 259
 260   /* All std.. are open. */
 261   if (fcntl(0, F_GETFD) == -1) retval |= 0x11;
 262   if (fcntl(1, F_GETFD) == -1) retval |= 0x11;
 263   if (fcntl(2, F_GETFD) == -1) retval |= 0x11;
 264
 265   /* Fd no. 3, 4, 7 and 8 are open. */
 266   if (fcntl(3, F_GETFD) == -1) retval |= 0x12;
 267   if (fcntl(4, F_GETFD) == -1) retval |= 0x12;
 268   if (fcntl(7, F_GETFD) == -1) retval |= 0x12;
 269
 270   /* Fd no. 5, 6 and 9 trough OPEN_MAX are closed. */
 271   if (fcntl(5, F_GETFD) != -1) retval |= 0x14;
 272   if (fcntl(6, F_GETFD) != -1) retval |= 0x14;
 273   for (i = 9; i < OPEN_MAX; i++)
 274         if (fcntl(i, F_GETFD) != -1) retval |= 0x18;
 275
 276 #if 0
 277   /* Fd no. 3 is WRLCKed. */
 278   fl.l_type = F_WRLCK;
 279   if (fcntl(3, F_SETLK, &fl) != -1) retval |= 0x21;
 280   if (errno != EACCES && errno != EAGAIN) retval |= 0x22;
 281   fl.l_type = F_RDLCK;
 282   if (fcntl(3, F_SETLK, &fl) != -1) retval |= 0x24;
 283   if (errno != EACCES && errno != EAGAIN) retval |= 0x22;
 284   fl.l_type = F_RDLCK;
 285   if (fcntl(3, F_GETLK, &fl) == -1) retval |= 0x28;
 286   if (fl.l_type != F_WRLCK) retval |= 0x28;
 287   if (fl.l_pid != getpid()) retval |= 0x28;
 288   fl.l_type = F_WRLCK;
 289   if (fcntl(3, F_GETLK, &fl) == -1) retval |= 0x28;
 290   if (fl.l_type != F_WRLCK) retval |= 0x28;
 291   if (fl.l_pid != getpid()) retval |= 0x28;
 292 #endif
 293
 294   /* Fd no. 4 is not locked. */
 295   fl.l_type = F_WRLCK;
 296   if (fcntl(4, F_SETLK, &fl) == -1) retval |= 0x41;
 297   if (fcntl(4, F_GETLK, &fl) == -1) retval |= 0x42;
 298 #if 0 /* XXX - see test7.c */
 299   if (fl.l_type != F_WRLCK) retval |= 0x42;
 300   if (fl.l_pid != getpid()) retval |= 0x42;
 301 #endif /* 0 */
 302
 303   /* Fd no. 8 is locked after the fork, it is ours. */
 304   fl.l_type = F_WRLCK;
 305   if (fcntl(8, F_SETLK, &fl) == -1) retval |= 0x44;
 306   if (fcntl(8, F_GETLK, &fl) == -1) retval |= 0x48;
 307 #if 0 /* XXX - see test7.c */
 308   if (fl.l_type != F_WRLCK) retval |= 0x48;
 309   if (fl.l_pid != getpid()) retval |= 0x48;
 310 #endif /* 0 */
 311
 312 #if 0
 313   /* Fd no. 7 is RDLCKed. */
 314   fl.l_type = F_WRLCK;
 315   if (fcntl(7, F_SETLK, &fl) != -1) retval |= 0x81;
 316   if (errno != EACCES && errno != EAGAIN) retval |= 0x82;
 317   fl.l_type = F_RDLCK;
 318   if (fcntl(7, F_SETLK, &fl) == -1) retval |= 0x84;
 319   fl.l_type = F_RDLCK;
 320   if (fcntl(7, F_GETLK, &fl) == -1) retval |= 0x88;
 321   if (fl.l_type != F_UNLCK) retval |= 0x88;
 322   fl.l_type = F_WRLCK;
 323   if (fcntl(7, F_GETLK, &fl) == -1) retval |= 0x88;
 324   if (fl.l_type != F_RDLCK) retval |= 0x88;
 325   if (fl.l_pid != getppid()) retval |= 0x88;
 326 #endif
 327
 328   return retval;
 329 }
 330