ldns(3)

💌 ldns(3) — the girlies' guide to MX rdata fields 💌

okay so bestie, welcome to ldns(3), from the Library Functions Manual 🎀 this is the lil corner of the ldns world where you pull the good stuff out of an MX resource record — and honestly? it's giving very demure, very mindful, very two functions and we're done ✨

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🌸 NAME 🌸

ldns_rr_mx_preference, ldns_rr_mx_exchange — get MX RR rdata fields 💖

no literally that's the whole job. two functions. one record type. slay.

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✨ SYNOPSIS ✨

first, you gotta bring your friends. include the squad:

#include <stdint.h>
#include <stdbool.h>

#include <ldns/ldns.h>

then here are the two main characters 👑

ldns_rdf* ldns_rr_mx_preference(const ldns_rr *r);

ldns_rdf* ldns_rr_mx_exchange(const ldns_rr *r);

that's it. that's the whole vibe check. 🦋

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💅 DESCRIPTION 💅

so here's the tea, fr fr:

• ldns_rr_mx_preference() — this one returns the mx pref. of a LDNS_RR_TYPE_MX rr 🔥
  • r: the resource record
  • Returns a ldns_rdf* with the preference, or NULL on failure 😭 (we do not love failure but we respect the honesty)
• ldns_rr_mx_exchange() — and this one returns the mx host of a LDNS_RR_TYPE_MX rr 🌈
  • r: the resource record
  • Returns a ldns_rdf* with the name of the MX host, or NULL on failure 😭 (again. the drama.)

like, preference = the priority number, exchange = the host name. both come back as ldns_rdf* and both can hand you NULL if things go sideways, so check your return values bestie, i am begging 🙈

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👑 AUTHOR 👑

The ldns team at NLnet Labs. icons only, no notes 🫶

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🐛 REPORTING BUGS 🐛

found a bug? do NOT suffer in silence, that's not the energy. report it to dns-team@nlnetlabs.nl or on GitHub at https://github.com/NLnetLabs/ldns/issues 💜 they genuinely want to know, periodt.

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📜 COPYRIGHT 📜

Copyright (c) 2004 - 2006 NLnet Labs.

Licensed under the BSD License. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

okay important one: that "NO warranty" is in all caps for a reason 💀 it means exactly what it says — no promises, no safety net. use it, love it, but don't come for them if it doesn't do the thing.

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🔍 SEE ALSO 🔍

go read these too, they're the extended universe:

• perldoc Net::DNS
• RFC1034
• RFC1035
• RFC4033
• RFC4034
• RFC4035

iykyk 📚✨

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🧚 REMARKS 🧚

This manpage was automatically generated from the ldns source code. yes, a robot wrote it. no, that does not make it less valid. we respect the machine 🤖💖

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and that's the whole page babes!! this little masterpiece is from 30 May 2006, and it lives under ldns(3) — go forth and fetch those MX fields, you absolute legend 🌟💅🎀