0_mudai.md

sonya => 殺し屋

yasuna => おバカ

agiri => 忍者

botsu => （何書いたっけ）

kmb.c

/*
 * 古典的 login シミュレータ
 *
 * % gcc kmb.c -lbenly_typestring -o kmb
 */
#include <benly/typestring.h>
#include <stdio.h>
#include <string.h>
#include <pwd.h>

#define SALT    "kmb"
#define PWDDB   "./passwd"

static struct passwd*
getpwnamin(const char* user)
{
    struct passwd*  pwd = NULL;

    FILE*   fp  = fopen(PWDDB, "r");

    while ((pwd = fgetpwent(fp)) != NULL) {
        if (strcmp(user, pwd->pw_name) == 0)
            break;
    }
    fclose(fp);

    return pwd;
}

static
int login(STRING** s)
{
    struct passwd*  pwd = NULL;

    fprintf(stdout, "login: ");
    fgetline(stdin, s);
    (*s)->chomp(s);
    if ((pwd = getpwnamin((*s)->c_str(*s))) == NULL)
        return 0;
    fprintf(stdout, "password: ");
    fgetline(stdin, s);
    (*s)->chomp(s);
    (*s)->assign(s, (*s)->crypt(*s, SALT));
    if (strcmp(pwd->pw_passwd, (*s)->c_str(*s)) == 0)
        return 1;
    fprintf(stdout, "incorrect\n");

    return 0;
}

int main(void)
{
    STRING* s   = new_string(NULL);

    while (!login(&s));
    fprintf(stdout, "ナイスですねーナイスですねー\n");
    s->release(s);

    return 0;
}

passwd

sonya:km1hQI9EQaw0I:1000:1000:sonya:/home/sonya:/bin/sh
yasuna:kmboYiYiO3otU:2000:2000:yasuna:/home/yasuna:/bin/sh
agiri:kms1/t.jJ6WSw:3000:3000:sonya:/home/agiri:/bin/sh
botsu:kmIKigOujGXF6:65535:65535:botsu:/nonexistent:/bin/false