shishi_realm_default_guess(3)

📦
version 1.0.3 · 2 versions
  • 1.0.3 · debian bookworm, debian trixie, nixos 26.05, nixpkgs unstable, ubuntu noble, ubuntu questing, ubuntu resolute, ubuntu stonking (latest)
  • 1.0.2 · ubuntu jammy
, in debian bookworm, debian trixie, nixos 26.05, nixpkgs unstable, ubuntu noble, ubuntu questing, ubuntu resolute, ubuntu stonking

💫 shishi_realm_default_guess — the realm-guessing bestie 💫

okay so we're in the shishi manual, section 3, and today's main character is shishi_realm_default_guess. she's an API function. she guesses realms. she's doing her best 🫶

🌸 SYNOPSIS 🌸

#include <shishi.h>

char * shishi_realm_default_guess();

✨ DESCRIPTION ✨

so basically she's gonna guess a realm for you, and her first move is getdomainname(). now listen — getdomainname() is lowkey lying to you, bestie, because what it actually hands back is a NIS/YP domain. BUT. if it's been set up properly, it might genuinely be a decent first guess, so we're rolling with it. no cap.

if that NIS query fails, she pivots to gethostname(). and if that fails too? she doesn't spiral, she just falls back to returning the artificial string "could-not-guess-default-realm". iconic behaviour honestly. 💅

⚠️ now here's the tea. the hostname is not trimmed off of the string that gethostname() returns — so she's out here pretending the local host name is a valid realm name. it's giving wishful thinking.

the resulting corner case could merit a check that the suggested realm is distinct from the fully qualified host, and if it isn't, you should simply strip the host name off the returned string before it ever gets used in an application. periodt.

one reason for sticking with the present behaviour: some systems reply from gethostname() with a non-qualified host name. so yeah, it's messy out there. 🙈

🎀 RETURN VALUE 🎀

she returns a guessed realm for the running host, and it contains a string that has to be deallocated with free() by the caller. that's on you, bestie. don't forget. i'm literally begging. 😭

🐛 REPORTING BUGS 🐛

found a bug? spill it to <bug-shishi@gnu.org>.

Copyright © 2002-2022 Simon Josefsson.

Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.

🦋 SEE ALSO 🦋

the full documentation for shishi is maintained as a Texinfo manual. if the info and shishi programs are properly installed at your site, the command

info shishi

should give you access to the complete manual. iykyk ✨

and that's a wrap, bestie 💖 this was shishi, version 1.0.3, page shishi_realm_default_guess(3) — go forth and guess those realms responsibly, mwah 🎀

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