#include <stdio.h>
#include <stdlib.h>
#include <shadow.h>
#include <unistd.h>

int main(int argc, char * argv[]) {
	struct spwd *entry;
	
	if (argc<3) {
		fprintf(stderr,"Usage: %s [username] [password]\n",argv[0]);
		exit(1);
	}

	entry = getspnam(argv[1]);
	if (!entry) {
		if (access("/etc/shadow",W_OK)!=0)
			fprintf(stderr,"You do not have permission to access to the shadow file.\n");
		else
			fprintf(stderr,"Cannot find user '%s'.\n",argv[1]);
		exit(1);
	}

	if (!strcmp(crypt(argv[2],entry->sp_pwdp),entry->sp_pwdp)) {
		printf("Matches.\n");
	}
	else
		printf("Does not match.\n");
	exit(0);
}