Alejandro Colomar
8c6634d9bc
These functions are like [v]snprintf(3), but return -1 on truncation, which makes it easier to test. In fact, the API of swprintf(3), which was invented later than snprintf(3), and is the wide-character version of it, is identical to this snprintf_(). snprintf(3) is iseful in two cases: - We don't care if the output is truncated. snprintf(3) is fine for those, and the return value can be ignored. But snprintf_() is also fine for those. - Truncation is bad. In that case, it's as bad as a hard error (-1) from snprintf, so merging both problems into the same error code makes it easier to handle errors. Return the length if no truncation so that we can use it if necessary. Not returning the whole length before truncation makes a better API, which need not read the entire input, so it's less vulnerable to DoS attacks when a malicious user controls the input. Use these functions to implement SNPRINTF(). Cc: Samanta Navarro <ferivoz@riseup.net> Signed-off-by: Alejandro Colomar <alx@kernel.org>
shadow-utils
Introduction
The shadow-utils package includes the necessary programs for converting UNIX password files to the shadow password format, plus programs for managing user and group accounts. The pwconv command converts passwords to the shadow password format. The pwunconv command unconverts shadow passwords and generates a passwd file (a standard UNIX password file). The pwck command checks the integrity of password and shadow files. The lastlog command prints out the last login times for all users. The useradd, userdel, and usermod commands are used for managing user accounts. The groupadd, groupdel, and groupmod commands are used for managing group accounts.
Sites
Code
The main development branch is at https://github.com/shadow-maint/shadow.git
See STABLE.md for a list of supported stable branches.
Contacts
There are several ways to contact us:
- the general discussion mailing list
- the #shadow IRC channel on libera.chat:
- irc://irc.libera.chat/shadow
Mailing archives
- the general discussion mailing list archive
- the commit mailing list archive, only used for historical purposes
Contributions
Contributions are welcome. Follow the guidelines before posting any patches.
Authors and maintainers
Authors and maintainers are listed in AUTHORS.md.