1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <sys/types.h>

4 #include <unistd.h>

5 #include <sys/stat.h>

6 #include <string.h>

7

8 #ifndef CGISCRIPT_PATH

9 #define CGISCRIPT_PATH "./s4.cgi"

10 #endif

11

12 int main(int argc, char *argv[])

13 {

14 char *path=malloc(strlen(argv[0]));

15 char *p;

16 uid_t euid = geteuid();

17 struct stat st;

18 if (0 == euid) {

19 fputs("Do not call this program with suid 0\n", stderr);

20 exit(0);

21 }

22 strcpy(path, argv[0]);

23 p = strrchr(path, '/');

24 if (p) {

25 *p = '\0';

26 } else {

27 fputs("Cannot detect the directory where this program located.\n", stderr);

28 exit(1);

29 }

30

31 if (-1 == chdir(path)) {

32 fprintf(stderr, "Cannot chdir to %s\n", path);

33 exit(2);

34 }

35 if (0 > stat(CGISCRIPT_PATH, &st)) {

36 fprintf(stderr, "Cannot access %s\n", CGISCRIPT_PATH);

37 exit(3);

38 }

39 if (st.st_uid != euid) {

40 fputs("UID of cgi program mismatch\n", stderr);

41 fputs("Do chown so that wrapper and cgi files' uid matches.\n", stderr);

42 exit(4);

43 }

44 if (st.st_mode & (S_IWGRP | S_IWOTH)) {

45 fputs("This program is writable for group/others.\n", stderr);

46 fputs("Do chmod og-w for installed cgi-program.\n", stderr);

47 exit(5);

48 }

49 if (0 > stat(".", &st)) {

50 fputs("Cannot stat current directory\n", stderr);

51 fputs("Please ensure installed directory is readable.\n", stderr);

52 exit(6);

53 }

54 /*

55 if (st.st_uid != euid) {

56 fputs("UID of directory mismatch\n", stderr);

57 fputs("Do chown so that wrapper and directorys' uid matches.\n", stderr);

58 exit(7);

59 }

60 */

61 if (st.st_mode & (S_IWGRP | S_IWOTH)) {

62 fputs("This directory is writable for group/others.\n", stderr);

63 fputs("Do chmod og-w for installed directory.\n", stderr);

64 exit(8);

65 }

66 argv[0] = CGISCRIPT_PATH;

67 execv(CGISCRIPT_PATH, argv);

68 }