1#include <sys/types.h>
2#include <fcntl.h>
3#include <stdio.h>
4#include <string.h>
5#include <unistd.h>
6
7int main(int argc, char* argv[]) {
8  if (argc == 2 && !strcmp(argv[1], "--pass")) {
9    fprintf(stderr,"[%d] %s immediately returning 0\n", getpid(), argv[0]);
10    return 0;
11  }
12
13  if (argc == 2 && !strcmp(argv[1], "--fail")) {
14    fprintf(stderr,"[%d] %s immediately returning 1\n", getpid(), argv[0]);
15    return 1;
16  }
17
18  if (argc == 2 && !strcmp(argv[1], "--checkroot")) {
19    int rc = (geteuid() == 0);
20    fprintf(stderr,"[uid:%d] %s immediately returning (geteuid() == 0) = %d\n", geteuid(), argv[0], rc);
21    return rc;
22  }
23
24  if (argc == 2 && !strcmp(argv[1], "--capmode")) {
25    /* Expect to already be in capability mode: check we can't open a file */
26    int rc = 0;
27
28    int fd = open("/etc/passwd", O_RDONLY);
29    if (fd > 0) {
30      fprintf(stderr,"[%d] %s unexpectedly able to open file\n", getpid(), argv[0]);
31      rc = 1;
32    }
33    fprintf(stderr,"[%d] %s --capmode returning %d\n", getpid(), argv[0], rc);
34    return rc;
35  }
36
37  return -1;
38}
39