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Top Forums Programming Tweaked getpass() function gives an untraceable bug Post 302819579 by royalibrahim on Tuesday 11th of June 2013 04:44:48 AM
Old 06-11-2013
Tweaked getpass() function gives an untraceable bug

I have customized the getpass() as follows:

Code:
char* my_getpass(const char* str) {
    struct termios oflags, nflags;
    static char passwd[64];

    /* disabling echo */
    tcgetattr(fileno(stdin), &oflags);
    nflags = oflags;
    nflags.c_lflag &= ~ECHO;
    nflags.c_lflag |= ECHONL;
    tcsetattr(fileno(stdin), TCSANOW, &nflags);
    printf(str);
    fgets(passwd, sizeof(passwd), stdin);
    passwd[strlen(passwd) - 1] = '\0';

    /* restore terminal */
    tcsetattr(fileno(stdin), TCSANOW, &oflags);
    return passwd;
}

int main() {
    char name[8], *pwd;
    printf("Login as: ");
    fgets(name, sizeof(name), stdin);
    pwd = my_getpass("Password: ");
    if (strcmp(pwd, "george"))
        fprintf(stderr, "\nPassword incorrect\n");
    else {
        puts("\nCorrect Password");
        FILE* fp = fopen("./passwd.txt", "w");
        fprintf(fp, "user: (%s), password: (%s) \n", name, pwd);
        fclose(fp);
    }
}

but now the output file "password.txt" contains a carriage return in the result as
Code:
$ more passwd.txt 
user: (dude
), password: (george)

which should have been as,
Code:
user: (dude), password: (george)

could anyone suggest me how to correct this bug? Smilie
 

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GETPWENT(3)						     Linux Programmer's Manual						       GETPWENT(3)

NAME
getpwent, setpwent, endpwent - get password file entry SYNOPSIS
#include <pwd.h> #include <sys/types.h> struct passwd *getpwent(void); void setpwent(void); void endpwent(void); DESCRIPTION
The getpwent() function returns a pointer to a structure containing the broken out fields of a line from /etc/passwd. The first time it is called it returns the first entry; thereafter, it returns successive entries. The setpwent() function rewinds the file pointer to the beginning of the /etc/passwd file. The endpwent() function closes the /etc/passwd file. The passwd structure is defined in <pwd.h> as follows: struct passwd { char *pw_name; /* user name */ char *pw_passwd; /* user password */ uid_t pw_uid; /* user id */ gid_t pw_gid; /* group id */ char *pw_gecos; /* real name */ char *pw_dir; /* home directory */ char *pw_shell; /* shell program */ }; RETURN VALUE
The getpwent() function returns the passwd structure, or NULL if there are no more entries or an error occurs. ERRORS
ENOMEM Insufficient memory to allocate passwd structure. FILES
/etc/passwd password database file CONFORMING TO
SVID 3, BSD 4.3 SEE ALSO
fgetpwent(3), getpwnam(3), getpwuid(3), getpw(3), putpwent(3), passwd(5) GNU
1996-05-27 GETPWENT(3)
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