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Full Discussion: Tweaked getpass() function gives an untraceable bug
Top Forums Programming Tweaked getpass() function gives an untraceable bug Post 302819751 by Corona688 on Tuesday 11th of June 2013 10:45:55 AM
Old 06-11-2013
Code:
    fgets(passwd, sizeof(passwd), stdin);
    passwd[strlen(passwd) - 1] = '\0';

This looks to me like you're trying to add a null-terminator to the string.

strlen() only works when the string already has a null terminator.

fgets() gives it a null terminator anyway.

It's not a bug, it's doing exactly what you tell it to... fgets() adds the return key to the string. So change it to this:

Code:
    fgets(passwd, sizeof(passwd), stdin);
    passwd[strlen(passwd) - 2] = '\0';

...to wipe out the very last character in the string, the newline.

Also: Make your buffer 4096, not 8, or someone is almost guaranteed to overflow and crash it.
Last edited by Corona688; 06-11-2013 at 12:02 PM..
This User Gave Thanks to Corona688 For This Post:
royalibrahim
 

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LEARN ABOUT OPENSOLARIS

vino-passwd

vino-passwd(1)							   User Commands						    vino-passwd(1)

NAME

       vino-passwd - change vino login password

SYNOPSIS

       vino-passwd [--help] [--version]

DESCRIPTION

       vino-passwd is a command line tool to change the vino login password.

OPTIONS

       These  programs	follow	the  usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options for the
       command vino-passwd is included below.

       -?, --help	       display this help and exit

       -v, --version	       output version information and exit

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWgnome-remote-desktop	   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Volatile			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       vino-server(1), vino-preferences(1), attributes(5), gnome-std-options(5)

NOTES

       Written by Halton Huo, Sun Microsystems Inc., 2008.

SunOS 5.11							    15 Aug 2008 						    vino-passwd(1)
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