#include <cap-ng.h>#include <err.h>#include <linux/capability.h>#include <stdbool.h>#include <string.h>#include <stdio.h>#include <sys/prctl.h>#include <sys/auxv.h> #ifndef PR_CAP_AMBIENT#define PR_CAP_AMBIENT			47# define PR_CAP_AMBIENT_IS_SET		1# define PR_CAP_AMBIENT_RAISE		2# define PR_CAP_AMBIENT_LOWER		3# define PR_CAP_AMBIENT_CLEAR_ALL	4#endif #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 19)# define HAVE_GETAUXVAL#endif static bool bool_arg(char **argv, int i){	if (!strcmp(argv[i], "0"))		return false;	else if (!strcmp(argv[i], "1"))		return true;	else		errx(1, "wrong argv[%d]", i);} int main(int argc, char **argv){	const char *atsec = ""; 	/*	 * Be careful just in case a setgid or setcapped copy of this	 * helper gets out.	 */ 	if (argc != 5)		errx(1, "wrong argc"); #ifdef HAVE_GETAUXVAL	if (getauxval(AT_SECURE))		atsec = " (AT_SECURE is set)";	else		atsec = " (AT_SECURE is not set)";#endif 	capng_get_caps_process(); 	if (capng_have_capability(CAPNG_EFFECTIVE, CAP_NET_BIND_SERVICE) != bool_arg(argv, 1)) {		printf("[FAIL]\tWrong effective state%s\n", atsec);		return 1;	}	if (capng_have_capability(CAPNG_PERMITTED, CAP_NET_BIND_SERVICE) != bool_arg(argv, 2)) {		printf("[FAIL]\tWrong permitted state%s\n", atsec);		return 1;	}	if (capng_have_capability(CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE) != bool_arg(argv, 3)) {		printf("[FAIL]\tWrong inheritable state%s\n", atsec);		return 1;	} 	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_NET_BIND_SERVICE, 0, 0, 0) != bool_arg(argv, 4)) {		printf("[FAIL]\tWrong ambient state%s\n", atsec);		return 1;	} 	printf("[OK]\tCapabilities after execve were correct\n");	return 0;}