90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <sys/syslimits.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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int max_error = 5;
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#include "common.h"
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void dangling_slink(int sub_test, char const slink_to[PATH_MAX]);
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void dangling_slink(int sub_test, char const slink_to[PATH_MAX])
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{
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pid_t child;
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subtest = sub_test;
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child = fork();
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if (child == (pid_t) -1) {
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e(1);
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return;
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} else if (child == (pid_t) 0) {
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/* I'm the child. Create a dangling symlink with an absolute path */
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int fd;
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char buf[4];
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/* We don't want to actually write to '/', so instead we pretend */
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if (chroot(".") != 0) e(2);
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/* Create file 'slink_to' with contents "bar" */
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if ((fd = open(slink_to, O_CREAT|O_WRONLY)) == -1) e(3);
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if (write(fd, "bar", strlen("bar")) != strlen("bar")) e(4);
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close(fd);
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if (symlink(slink_to, "a") == -1) e(5); /* Create the symlink */
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if (rename(slink_to, "c") == -1) e(6); /* Make it a dangling symlink */
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/* Write "foo" to symlink; this should recreate file 'slink_to' with
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* contents "foo" */
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if ((fd = open("a", O_CREAT|O_WRONLY)) == -1) e(7);
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if (write(fd, "foo", strlen("foo")) != strlen("foo")) e(8);
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close(fd);
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/* Verify 'a' and 'slink_to' contain "foo" */
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memset(buf, '\0', sizeof(buf));
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if ((fd = open("a", O_RDONLY)) == -1) e(9);
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if (read(fd, buf, 3) != 3) e(10);
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if (strncmp(buf, "foo", strlen("foo"))) e(11);
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close(fd);
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memset(buf, '\0', sizeof(buf));
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if ((fd = open(slink_to, O_RDONLY)) == -1) e(12);
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if (read(fd, buf, 3) != 3) e(13);
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if (strncmp(buf, "foo", strlen("foo"))) e(14);
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close(fd);
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/* Verify 'c' contains 'bar' */
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memset(buf, '\0', sizeof(buf));
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if ((fd = open("c", O_RDONLY)) == -1) e(15);
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if (read(fd, buf, 3) != 3) e(16);
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if (strncmp(buf, "bar", strlen("bar"))) e(17);
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close(fd);
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/* Cleanup created files */
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if (unlink(slink_to) == -1) e(18);
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if (unlink("a") == -1) e(19);
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if (unlink("c") == -1) e(20);
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exit(EXIT_SUCCESS);
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} else {
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int status;
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if (wait(&status) == -1) e(7);
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}
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}
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int main(int argc, char *argv[])
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{
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start(61);
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dangling_slink(1, "/abs"); /* Create dangling symlink with absolute path */
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dangling_slink(2, "rel"); /* Create dangling symlink with relative path */
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quit();
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return(-1); /* Unreachable */
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}
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