小工具，Linux修改系统可登录用户密码

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
#include <string.h>

#define BUFFER_SIZ 1024


char pool[] = {
    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
    'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
    'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D',
    'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
    'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
    'Y', 'Z', '!', '@', '#', '$', '%', '^', '&', '*',
    '[', ']', '\\', '|', ';', '\'', ',', '.', '/', '{', '}', ':', '"', '<', '>', '?'
    
};
int main(int argc, char *argv[])
{
    int PASSWD_LEN  = 16;
    struct timeval tpstart;
    char password[BUFFER_SIZ];
    int i = 0;
    
    if (argv[1] != NULL)
    {
        PASSWD_LEN = atoi(argv[1]);
    }
    memset(password, 0, BUFFER_SIZ);
    gettimeofday(&tpstart, NULL);
    srand(tpstart.tv_usec);
    while (i != PASSWD_LEN) {
        password[i++] = pool[rand() % sizeof(pool)];
    }
    printf("%s\n", password);
    return 0;
}

#编译
gcc a.c -o random

#！/bin/bash
#
# 此脚本用于root账号密码修改
#
#

main()
{
    IP=$(curl members.3322.org/dyndns/getip)        #获取公网IP
    echo $IP
    echo $IP >> passwd.txt
    

    USER=$(cat /etc/passwd | grep -v nologin | grep -v root | grep bash  | grep sh | awk -F':' '{print $1}')        #非特权用户
    
    for u in $USER
    do
        PSSWD=$(./random)                   #生产随机密码
        echo ${u} ${PSSWD}
        echo "  ${u} ${PSSWD}" >> passwd.txt    #写入文件保存
        echo ${u}:${PSSWD} | chpasswd
    done
    
    
    
    PSSWD=$(./random)
    echo root:${PSSWD} | chpasswd           #root用户改密码
    
    echo root ${PSSWD}
    echo "  root ${PSSWD}" >> passwd.txt        #写入文件保存
}


main