Linux终端下输入密码显示星号

最新推荐文章于 2025-04-05 10:34:50 发布

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本文介绍了一个简单的Linux程序，用于在终端中输入密码时隐藏字符显示为星号(*)，增加了密码输入的安全性和隐私保护。该程序使用了termios库来控制终端输入属性。

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Linux终端下输入密码显示星号

passwd.h

#ifndef _PASSWD_H
#define _PASSWD_H

#include <stdio.h>  
#include <stdlib.h>  
#include <termios.h> 
#include <unistd.h> 
#include <assert.h> 
#include <string.h> 

char getch()  
{
    int c = 0;  
    int res = 0;    
    struct termios org_opts, new_opts; 
    res = tcgetattr(STDIN_FILENO, &org_opts);    
    assert(res == 0);    
    memcpy(&new_opts, &org_opts, sizeof(new_opts));
    new_opts.c_lflag &= ~(ICANON | ECHO | ECHOE | ECHOK | ECHONL | ECHOPRT | ECHOKE | ICRNL); 
    tcsetattr(STDIN_FILENO, TCSANOW, &new_opts); 
    c = getchar();    
    res = tcsetattr(STDIN_FILENO, TCSANOW, &org_opts);
    assert(res == 0); 
    return c;
}
	
void passwd()
{
    FILE *fp;
    char input[] = {0};
    int j,n;
    char passwd[]="123";

    system("reset");
    if((fp = fopen("passwd.txt","w")) == NULL)
    {
        printf("open passwd file error\n");
        exit(0);
    }
    if(fwrite(passwd,sizeof(passwd),1,fp) != 1)
    {
        printf("write file error!\n");
        exit(0);
    }
    fscanf(fp,"%s",passwd);
    n = strlen(passwd);
    printf("\n\n\n\n\n\t\t*********welcome to use my system********\n");
    printf("\n\t\t\tPlease enter password:");

    while(1 != j)
    {
        int i = 0;
        fflush(stdin);
        input[0] = getch();
        while(input[i] != '\n' && i < n)
        {
            printf("*");
            i++;
            input[i] = getch();
        }

        if(strncmp(passwd,input,n) == 0)
        {
           printf("\n\t\t\t\tOK!\n");
            j = 1;
        }
        else
        {
            printf("\n\t\t\tSorry,try again!\n");
            printf("\t\t\t");
        }
    }
    getch();
}

#endif

test.c

#include <stdio.h>
#include "passwd.h"

int main()
{
	passwd();
	return 0;
}