unix下取得加密的用户密码

    我们知道unix的用户信息要不然放在/etc/passwd,要不放在/etc/shadow中

在ubuntu中写一个比较密码的程序:

#define _XOPEN_SOURCE#include <unistd.h>#include <stdlib.h>#include <stdio.h>#include <shadow.h>#include <pwd.h>int main(int argc,char **argv){if(argc!=2){printf("usage : %s user_namen",argv[0]);exit(-1);}struct passwd *pwd = getpwnam(argv[1]);printf("%s pwd is %sn",argv[1],pwd->pw_passwd);struct spwd *spwd = getspnam(argv[1]);printf("%s pwd is %sn",argv[1],spwd->sp_pwdp);char *pwd_in = getpass("passwd:");char *epwd = crypt(pwd_in,spwd->sp_pwdp);printf("%s epwd is %sn",argv[1],epwd);return 0;}

    以上代码在mac os X 10.x后无效，貌似必须采用mac api或者PAM的方式鸟。