From 74b2466e14a1961bf3ac0e8a60cfaceec705bd59 Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Wed, 16 Jul 2014 00:26:02 +0200 Subject: resolved: add a DNS client stub resolver Let's turn resolved into a something truly useful: a fully asynchronous DNS stub resolver that subscribes to network changes. (More to come: caching, LLMNR, mDNS/DNS-SD, DNSSEC, IDN, NSS module) --- src/resolve/resolved-dns-rr.c | 76 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 src/resolve/resolved-dns-rr.c (limited to 'src/resolve/resolved-dns-rr.c') diff --git a/src/resolve/resolved-dns-rr.c b/src/resolve/resolved-dns-rr.c new file mode 100644 index 0000000000..cb555cb4ef --- /dev/null +++ b/src/resolve/resolved-dns-rr.c @@ -0,0 +1,76 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2014 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see . +***/ + +#include "resolved-dns-rr.h" + +void dns_resource_key_free(DnsResourceKey *key) { + if (!key) + return; + + free(key->name); + zero(*key); +} + +DnsResourceRecord* dns_resource_record_new(void) { + DnsResourceRecord *rr; + + rr = new0(DnsResourceRecord, 1); + if (!rr) + return NULL; + + rr->n_ref = 1; + return rr; +} + +DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr) { + if (!rr) + return NULL; + + assert(rr->n_ref > 0); + rr->n_ref++; + + return rr; +} + +DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr) { + if (!rr) + return NULL; + + assert(rr->n_ref > 0); + + if (rr->n_ref > 1) { + rr->n_ref--; + return NULL; + } + + if (IN_SET(rr->key.type, DNS_TYPE_PTR, DNS_TYPE_NS, DNS_TYPE_CNAME)) + free(rr->ptr.name); + else if (rr->key.type == DNS_TYPE_HINFO) { + free(rr->hinfo.cpu); + free(rr->hinfo.os); + } else if (!IN_SET(rr->key.type, DNS_TYPE_A, DNS_TYPE_AAAA)) + free(rr->generic.data); + + dns_resource_key_free(&rr->key); + free(rr); + + return NULL; +} -- cgit v1.2.3-54-g00ecf