src/resolve/resolved-dns-server.c

	resolved-dns-server.c revision d5099efc47d4e6ac60816b5381a5f607ab03f06e
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering/***
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering  This file is part of systemd.
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering  Copyright 2014 Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering  systemd is free software; you can redistribute it and/or modify it
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering  under the terms of the GNU Lesser General Public License as published by
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering  the Free Software Foundation; either version 2.1 of the License, or
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering  (at your option) any later version.
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering  systemd is distributed in the hope that it will be useful, but
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering  WITHOUT ANY WARRANTY; without even the implied warranty of
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering  Lesser General Public License for more details.
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering  You should have received a copy of the GNU Lesser General Public License
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering  along with systemd; If not, see <http://www.gnu.org/licenses/>.
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering***/
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering#include "siphash24.h"
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering#include "resolved-dns-server.h"
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poetteringint dns_server_new(
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering                Manager *m,
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering                DnsServer **ret,
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering                DnsServerType type,
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering                Link *l,
0dd25fb9f005d8ab7ac4bc10a609d00569f8c56aLennart Poettering                int family,
3c0cf502796be355431d4a64d738e75f543aa51dLennart Poettering                const union in_addr_union *in_addr) {
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering        DnsServer *s, *tail;
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering        assert(m);
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering        assert((type == DNS_SERVER_LINK) == !!l);
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering        assert(in_addr);
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering        s = new0(DnsServer, 1);
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering        if (!s)
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering                return -ENOMEM;
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering        s->type = type;
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering        s->family = family;
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering        s->address = *in_addr;
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering        if (type == DNS_SERVER_LINK) {
6073b6f26ab9fc6bf335faa7073ec443eef093fdTom Gundersen                LIST_FIND_TAIL(servers, l->dns_servers, tail);
6073b6f26ab9fc6bf335faa7073ec443eef093fdTom Gundersen                LIST_INSERT_AFTER(servers, l->dns_servers, tail, s);
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering                s->link = l;
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering        } else if (type == DNS_SERVER_SYSTEM) {
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering                LIST_FIND_TAIL(servers, m->dns_servers, tail);
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering                LIST_INSERT_AFTER(servers, m->dns_servers, tail, s);
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering        } else if (type == DNS_SERVER_FALLBACK) {
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering                LIST_FIND_TAIL(servers, m->fallback_dns_servers, tail);
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering                LIST_INSERT_AFTER(servers, m->fallback_dns_servers, tail, s);
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering        } else
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering                assert_not_reached("Unknown server type");
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering        s->manager = m;
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering        /* A new DNS server that isn't fallback is added and the one
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering         * we used so far was a fallback one? Then let's try to pick
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering         * the new one */
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering        if (type != DNS_SERVER_FALLBACK &&
3e684349c2cead2e6fd2f816c34eb17daba23a49Lennart Poettering            m->current_dns_server &&
3e684349c2cead2e6fd2f816c34eb17daba23a49Lennart Poettering            m->current_dns_server->type == DNS_SERVER_FALLBACK)
3e684349c2cead2e6fd2f816c34eb17daba23a49Lennart Poettering                manager_set_dns_server(m, NULL);
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering        if (ret)
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering                *ret = s;
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering        return 0;
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering}
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart PoetteringDnsServer* dns_server_free(DnsServer *s)  {
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering        if (!s)
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering                return NULL;
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
2f82f5eae471a23a7aa9f40f19079a4b63e19496Lennart Poettering        if (s->manager) {
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering                if (s->type == DNS_SERVER_LINK)
6073b6f26ab9fc6bf335faa7073ec443eef093fdTom Gundersen                        LIST_REMOVE(servers, s->link->dns_servers, s);
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering                else if (s->type == DNS_SERVER_SYSTEM)
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering                        LIST_REMOVE(servers, s->manager->dns_servers, s);
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering                else if (s->type == DNS_SERVER_FALLBACK)
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering                        LIST_REMOVE(servers, s->manager->fallback_dns_servers, s);
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering                else
4e945a6f7971fd7d1f6b2c62ee3afdaff3c95ce4Lennart Poettering                        assert_not_reached("Unknown server type");
3e684349c2cead2e6fd2f816c34eb17daba23a49Lennart Poettering
3e684349c2cead2e6fd2f816c34eb17daba23a49Lennart Poettering                if (s->manager->current_dns_server == s)
3e684349c2cead2e6fd2f816c34eb17daba23a49Lennart Poettering                        manager_set_dns_server(s->manager, NULL);
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering        }
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering        if (s->link && s->link->current_dns_server == s)
2c27fbca2d88214bd305272308a370a962818f1eLennart Poettering                link_set_dns_server(s->link, NULL);
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering        free(s);
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering        return NULL;
74b2466e14a1961bf3ac0e8a60cfaceec705bd59Lennart Poettering}
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering
d5099efc47d4e6ac60816b5381a5f607ab03f06eMichal Schmidtstatic unsigned long dns_server_hash_func(const void *p, const uint8_t hash_key[HASH_KEY_SIZE]) {
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering        const DnsServer *s = p;
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering        uint64_t u;
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering        siphash24((uint8_t*) &u, &s->address, FAMILY_ADDRESS_SIZE(s->family), hash_key);
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering        u = u * hash_key[0] + u + s->family;
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering        return u;
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering}
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering
d5099efc47d4e6ac60816b5381a5f607ab03f06eMichal Schmidtstatic int dns_server_compare_func(const void *a, const void *b) {
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering        const DnsServer *x = a, *y = b;
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering        if (x->family < y->family)
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering                return -1;
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering        if (x->family > y->family)
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering                return 1;
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering        return memcmp(&x->address, &y->address, FAMILY_ADDRESS_SIZE(x->family));
87f5a19343acf8ba697acc5a62bdb1a2b8c9eda3Lennart Poettering}
d5099efc47d4e6ac60816b5381a5f607ab03f06eMichal Schmidt
d5099efc47d4e6ac60816b5381a5f607ab03f06eMichal Schmidtconst struct hash_ops dns_server_hash_ops = {
d5099efc47d4e6ac60816b5381a5f607ab03f06eMichal Schmidt        .hash = dns_server_hash_func,
d5099efc47d4e6ac60816b5381a5f607ab03f06eMichal Schmidt        .compare = dns_server_compare_func
d5099efc47d4e6ac60816b5381a5f607ab03f06eMichal Schmidt};