diff options
Diffstat (limited to 'src/resolve/resolved-link.c')
| -rw-r--r-- | src/resolve/resolved-link.c | 1113 |
1 files changed, 0 insertions, 1113 deletions
diff --git a/src/resolve/resolved-link.c b/src/resolve/resolved-link.c deleted file mode 100644 index 13e1f91192..0000000000 --- a/src/resolve/resolved-link.c +++ /dev/null @@ -1,1113 +0,0 @@ -/*** - 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 <http://www.gnu.org/licenses/>. -***/ - -#include <net/if.h> - -#include "sd-network.h" - -#include "alloc-util.h" -#include "fd-util.h" -#include "fileio.h" -#include "missing.h" -#include "mkdir.h" -#include "parse-util.h" -#include "resolved-link.h" -#include "string-util.h" -#include "strv.h" - -int link_new(Manager *m, Link **ret, int ifindex) { - _cleanup_(link_freep) Link *l = NULL; - int r; - - assert(m); - assert(ifindex > 0); - - r = hashmap_ensure_allocated(&m->links, NULL); - if (r < 0) - return r; - - l = new0(Link, 1); - if (!l) - return -ENOMEM; - - l->ifindex = ifindex; - l->llmnr_support = RESOLVE_SUPPORT_YES; - l->mdns_support = RESOLVE_SUPPORT_NO; - l->dnssec_mode = _DNSSEC_MODE_INVALID; - l->operstate = IF_OPER_UNKNOWN; - - if (asprintf(&l->state_file, "/run/systemd/resolve/netif/%i", ifindex) < 0) - return -ENOMEM; - - r = hashmap_put(m->links, INT_TO_PTR(ifindex), l); - if (r < 0) - return r; - - l->manager = m; - - if (ret) - *ret = l; - l = NULL; - - return 0; -} - -void link_flush_settings(Link *l) { - assert(l); - - l->llmnr_support = RESOLVE_SUPPORT_YES; - l->mdns_support = RESOLVE_SUPPORT_NO; - l->dnssec_mode = _DNSSEC_MODE_INVALID; - - dns_server_unlink_all(l->dns_servers); - dns_search_domain_unlink_all(l->search_domains); - - l->dnssec_negative_trust_anchors = set_free_free(l->dnssec_negative_trust_anchors); -} - -Link *link_free(Link *l) { - if (!l) - return NULL; - - link_flush_settings(l); - - while (l->addresses) - (void) link_address_free(l->addresses); - - if (l->manager) - hashmap_remove(l->manager->links, INT_TO_PTR(l->ifindex)); - - dns_scope_free(l->unicast_scope); - dns_scope_free(l->llmnr_ipv4_scope); - dns_scope_free(l->llmnr_ipv6_scope); - dns_scope_free(l->mdns_ipv4_scope); - dns_scope_free(l->mdns_ipv6_scope); - - free(l->state_file); - - return mfree(l); -} - -void link_allocate_scopes(Link *l) { - int r; - - assert(l); - - if (link_relevant(l, AF_UNSPEC, false) && - l->dns_servers) { - if (!l->unicast_scope) { - r = dns_scope_new(l->manager, &l->unicast_scope, l, DNS_PROTOCOL_DNS, AF_UNSPEC); - if (r < 0) - log_warning_errno(r, "Failed to allocate DNS scope: %m"); - } - } else - l->unicast_scope = dns_scope_free(l->unicast_scope); - - if (link_relevant(l, AF_INET, true) && - l->llmnr_support != RESOLVE_SUPPORT_NO && - l->manager->llmnr_support != RESOLVE_SUPPORT_NO) { - if (!l->llmnr_ipv4_scope) { - r = dns_scope_new(l->manager, &l->llmnr_ipv4_scope, l, DNS_PROTOCOL_LLMNR, AF_INET); - if (r < 0) - log_warning_errno(r, "Failed to allocate LLMNR IPv4 scope: %m"); - } - } else - l->llmnr_ipv4_scope = dns_scope_free(l->llmnr_ipv4_scope); - - if (link_relevant(l, AF_INET6, true) && - l->llmnr_support != RESOLVE_SUPPORT_NO && - l->manager->llmnr_support != RESOLVE_SUPPORT_NO && - socket_ipv6_is_supported()) { - if (!l->llmnr_ipv6_scope) { - r = dns_scope_new(l->manager, &l->llmnr_ipv6_scope, l, DNS_PROTOCOL_LLMNR, AF_INET6); - if (r < 0) - log_warning_errno(r, "Failed to allocate LLMNR IPv6 scope: %m"); - } - } else - l->llmnr_ipv6_scope = dns_scope_free(l->llmnr_ipv6_scope); - - if (link_relevant(l, AF_INET, true) && - l->mdns_support != RESOLVE_SUPPORT_NO && - l->manager->mdns_support != RESOLVE_SUPPORT_NO) { - if (!l->mdns_ipv4_scope) { - r = dns_scope_new(l->manager, &l->mdns_ipv4_scope, l, DNS_PROTOCOL_MDNS, AF_INET); - if (r < 0) - log_warning_errno(r, "Failed to allocate mDNS IPv4 scope: %m"); - } - } else - l->mdns_ipv4_scope = dns_scope_free(l->mdns_ipv4_scope); - - if (link_relevant(l, AF_INET6, true) && - l->mdns_support != RESOLVE_SUPPORT_NO && - l->manager->mdns_support != RESOLVE_SUPPORT_NO) { - if (!l->mdns_ipv6_scope) { - r = dns_scope_new(l->manager, &l->mdns_ipv6_scope, l, DNS_PROTOCOL_MDNS, AF_INET6); - if (r < 0) - log_warning_errno(r, "Failed to allocate mDNS IPv6 scope: %m"); - } - } else - l->mdns_ipv6_scope = dns_scope_free(l->mdns_ipv6_scope); -} - -void link_add_rrs(Link *l, bool force_remove) { - LinkAddress *a; - - LIST_FOREACH(addresses, a, l->addresses) - link_address_add_rrs(a, force_remove); -} - -int link_process_rtnl(Link *l, sd_netlink_message *m) { - const char *n = NULL; - int r; - - assert(l); - assert(m); - - r = sd_rtnl_message_link_get_flags(m, &l->flags); - if (r < 0) - return r; - - (void) sd_netlink_message_read_u32(m, IFLA_MTU, &l->mtu); - (void) sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &l->operstate); - - if (sd_netlink_message_read_string(m, IFLA_IFNAME, &n) >= 0) { - strncpy(l->name, n, sizeof(l->name)-1); - char_array_0(l->name); - } - - link_allocate_scopes(l); - link_add_rrs(l, false); - - return 0; -} - -static int link_update_dns_server_one(Link *l, const char *name) { - union in_addr_union a; - DnsServer *s; - int family, r; - - assert(l); - assert(name); - - r = in_addr_from_string_auto(name, &family, &a); - if (r < 0) - return r; - - s = dns_server_find(l->dns_servers, family, &a, 0); - if (s) { - dns_server_move_back_and_unmark(s); - return 0; - } - - return dns_server_new(l->manager, NULL, DNS_SERVER_LINK, l, family, &a, 0); -} - -static int link_update_dns_servers(Link *l) { - _cleanup_strv_free_ char **nameservers = NULL; - char **nameserver; - int r; - - assert(l); - - r = sd_network_link_get_dns(l->ifindex, &nameservers); - if (r == -ENODATA) { - r = 0; - goto clear; - } - if (r < 0) - goto clear; - - dns_server_mark_all(l->dns_servers); - - STRV_FOREACH(nameserver, nameservers) { - r = link_update_dns_server_one(l, *nameserver); - if (r < 0) - goto clear; - } - - dns_server_unlink_marked(l->dns_servers); - return 0; - -clear: - dns_server_unlink_all(l->dns_servers); - return r; -} - -static int link_update_llmnr_support(Link *l) { - _cleanup_free_ char *b = NULL; - int r; - - assert(l); - - r = sd_network_link_get_llmnr(l->ifindex, &b); - if (r == -ENODATA) { - r = 0; - goto clear; - } - if (r < 0) - goto clear; - - l->llmnr_support = resolve_support_from_string(b); - if (l->llmnr_support < 0) { - r = -EINVAL; - goto clear; - } - - return 0; - -clear: - l->llmnr_support = RESOLVE_SUPPORT_YES; - return r; -} - -static int link_update_mdns_support(Link *l) { - _cleanup_free_ char *b = NULL; - int r; - - assert(l); - - r = sd_network_link_get_mdns(l->ifindex, &b); - if (r == -ENODATA) { - r = 0; - goto clear; - } - if (r < 0) - goto clear; - - l->mdns_support = resolve_support_from_string(b); - if (l->mdns_support < 0) { - r = -EINVAL; - goto clear; - } - - return 0; - -clear: - l->mdns_support = RESOLVE_SUPPORT_NO; - return r; -} - -void link_set_dnssec_mode(Link *l, DnssecMode mode) { - - assert(l); - - if (l->dnssec_mode == mode) - return; - - if ((l->dnssec_mode == _DNSSEC_MODE_INVALID) || - (l->dnssec_mode == DNSSEC_NO && mode != DNSSEC_NO) || - (l->dnssec_mode == DNSSEC_ALLOW_DOWNGRADE && mode == DNSSEC_YES)) { - - /* When switching from non-DNSSEC mode to DNSSEC mode, flush the cache. Also when switching from the - * allow-downgrade mode to full DNSSEC mode, flush it too. */ - if (l->unicast_scope) - dns_cache_flush(&l->unicast_scope->cache); - } - - l->dnssec_mode = mode; -} - -static int link_update_dnssec_mode(Link *l) { - _cleanup_free_ char *m = NULL; - DnssecMode mode; - int r; - - assert(l); - - r = sd_network_link_get_dnssec(l->ifindex, &m); - if (r == -ENODATA) { - r = 0; - goto clear; - } - if (r < 0) - goto clear; - - mode = dnssec_mode_from_string(m); - if (mode < 0) { - r = -EINVAL; - goto clear; - } - - link_set_dnssec_mode(l, mode); - - return 0; - -clear: - l->dnssec_mode = _DNSSEC_MODE_INVALID; - return r; -} - -static int link_update_dnssec_negative_trust_anchors(Link *l) { - _cleanup_strv_free_ char **ntas = NULL; - _cleanup_set_free_free_ Set *ns = NULL; - int r; - - assert(l); - - r = sd_network_link_get_dnssec_negative_trust_anchors(l->ifindex, &ntas); - if (r == -ENODATA) { - r = 0; - goto clear; - } - if (r < 0) - goto clear; - - ns = set_new(&dns_name_hash_ops); - if (!ns) - return -ENOMEM; - - r = set_put_strdupv(ns, ntas); - if (r < 0) - return r; - - set_free_free(l->dnssec_negative_trust_anchors); - l->dnssec_negative_trust_anchors = ns; - ns = NULL; - - return 0; - -clear: - l->dnssec_negative_trust_anchors = set_free_free(l->dnssec_negative_trust_anchors); - return r; -} - -static int link_update_search_domain_one(Link *l, const char *name, bool route_only) { - DnsSearchDomain *d; - int r; - - assert(l); - assert(name); - - r = dns_search_domain_find(l->search_domains, name, &d); - if (r < 0) - return r; - if (r > 0) - dns_search_domain_move_back_and_unmark(d); - else { - r = dns_search_domain_new(l->manager, &d, DNS_SEARCH_DOMAIN_LINK, l, name); - if (r < 0) - return r; - } - - d->route_only = route_only; - return 0; -} - -static int link_update_search_domains(Link *l) { - _cleanup_strv_free_ char **sdomains = NULL, **rdomains = NULL; - char **i; - int r, q; - - assert(l); - - r = sd_network_link_get_search_domains(l->ifindex, &sdomains); - if (r < 0 && r != -ENODATA) - goto clear; - - q = sd_network_link_get_route_domains(l->ifindex, &rdomains); - if (q < 0 && q != -ENODATA) { - r = q; - goto clear; - } - - if (r == -ENODATA && q == -ENODATA) { - /* networkd knows nothing about this interface, and that's fine. */ - r = 0; - goto clear; - } - - dns_search_domain_mark_all(l->search_domains); - - STRV_FOREACH(i, sdomains) { - r = link_update_search_domain_one(l, *i, false); - if (r < 0) - goto clear; - } - - STRV_FOREACH(i, rdomains) { - r = link_update_search_domain_one(l, *i, true); - if (r < 0) - goto clear; - } - - dns_search_domain_unlink_marked(l->search_domains); - return 0; - -clear: - dns_search_domain_unlink_all(l->search_domains); - return r; -} - -static int link_is_managed(Link *l) { - _cleanup_free_ char *state = NULL; - int r; - - assert(l); - - r = sd_network_link_get_setup_state(l->ifindex, &state); - if (r == -ENODATA) - return 0; - if (r < 0) - return r; - - return !STR_IN_SET(state, "pending", "unmanaged"); -} - -static void link_read_settings(Link *l) { - int r; - - assert(l); - - /* Read settings from networkd, except when networkd is not managing this interface. */ - - r = link_is_managed(l); - if (r < 0) { - log_warning_errno(r, "Failed to determine whether interface %s is managed: %m", l->name); - return; - } - if (r == 0) { - - /* If this link used to be managed, but is now unmanaged, flush all our settings — but only once. */ - if (l->is_managed) - link_flush_settings(l); - - l->is_managed = false; - return; - } - - l->is_managed = true; - - r = link_update_dns_servers(l); - if (r < 0) - log_warning_errno(r, "Failed to read DNS servers for interface %s, ignoring: %m", l->name); - - r = link_update_llmnr_support(l); - if (r < 0) - log_warning_errno(r, "Failed to read LLMNR support for interface %s, ignoring: %m", l->name); - - r = link_update_mdns_support(l); - if (r < 0) - log_warning_errno(r, "Failed to read mDNS support for interface %s, ignoring: %m", l->name); - - r = link_update_dnssec_mode(l); - if (r < 0) - log_warning_errno(r, "Failed to read DNSSEC mode for interface %s, ignoring: %m", l->name); - - r = link_update_dnssec_negative_trust_anchors(l); - if (r < 0) - log_warning_errno(r, "Failed to read DNSSEC negative trust anchors for interface %s, ignoring: %m", l->name); - - r = link_update_search_domains(l); - if (r < 0) - log_warning_errno(r, "Failed to read search domains for interface %s, ignoring: %m", l->name); -} - -int link_update(Link *l) { - assert(l); - - link_read_settings(l); - link_load_user(l); - link_allocate_scopes(l); - link_add_rrs(l, false); - - return 0; -} - -bool link_relevant(Link *l, int family, bool local_multicast) { - _cleanup_free_ char *state = NULL; - LinkAddress *a; - - assert(l); - - /* A link is relevant for local multicast traffic if it isn't a loopback or pointopoint device, has a link - * beat, can do multicast and has at least one link-local (or better) IP address. - * - * A link is relevant for non-multicast traffic if it isn't a loopback device, has a link beat, and has at - * least one routable address.*/ - - if (l->flags & (IFF_LOOPBACK|IFF_DORMANT)) - return false; - - if ((l->flags & (IFF_UP|IFF_LOWER_UP)) != (IFF_UP|IFF_LOWER_UP)) - return false; - - if (local_multicast) { - if (l->flags & IFF_POINTOPOINT) - return false; - - if ((l->flags & IFF_MULTICAST) != IFF_MULTICAST) - return false; - } - - /* Check kernel operstate - * https://www.kernel.org/doc/Documentation/networking/operstates.txt */ - if (!IN_SET(l->operstate, IF_OPER_UNKNOWN, IF_OPER_UP)) - return false; - - (void) sd_network_link_get_operational_state(l->ifindex, &state); - if (state && !STR_IN_SET(state, "unknown", "degraded", "routable")) - return false; - - LIST_FOREACH(addresses, a, l->addresses) - if ((family == AF_UNSPEC || a->family == family) && link_address_relevant(a, local_multicast)) - return true; - - return false; -} - -LinkAddress *link_find_address(Link *l, int family, const union in_addr_union *in_addr) { - LinkAddress *a; - - assert(l); - - LIST_FOREACH(addresses, a, l->addresses) - if (a->family == family && in_addr_equal(family, &a->in_addr, in_addr)) - return a; - - return NULL; -} - -DnsServer* link_set_dns_server(Link *l, DnsServer *s) { - assert(l); - - if (l->current_dns_server == s) - return s; - - if (s) - log_info("Switching to DNS server %s for interface %s.", dns_server_string(s), l->name); - - dns_server_unref(l->current_dns_server); - l->current_dns_server = dns_server_ref(s); - - if (l->unicast_scope) - dns_cache_flush(&l->unicast_scope->cache); - - return s; -} - -DnsServer *link_get_dns_server(Link *l) { - assert(l); - - if (!l->current_dns_server) - link_set_dns_server(l, l->dns_servers); - - return l->current_dns_server; -} - -void link_next_dns_server(Link *l) { - assert(l); - - if (!l->current_dns_server) - return; - - /* Change to the next one, but make sure to follow the linked - * list only if this server is actually still linked. */ - if (l->current_dns_server->linked && l->current_dns_server->servers_next) { - link_set_dns_server(l, l->current_dns_server->servers_next); - return; - } - - link_set_dns_server(l, l->dns_servers); -} - -DnssecMode link_get_dnssec_mode(Link *l) { - assert(l); - - if (l->dnssec_mode != _DNSSEC_MODE_INVALID) - return l->dnssec_mode; - - return manager_get_dnssec_mode(l->manager); -} - -bool link_dnssec_supported(Link *l) { - DnsServer *server; - - assert(l); - - if (link_get_dnssec_mode(l) == DNSSEC_NO) - return false; - - server = link_get_dns_server(l); - if (server) - return dns_server_dnssec_supported(server); - - return true; -} - -int link_address_new(Link *l, LinkAddress **ret, int family, const union in_addr_union *in_addr) { - LinkAddress *a; - - assert(l); - assert(in_addr); - - a = new0(LinkAddress, 1); - if (!a) - return -ENOMEM; - - a->family = family; - a->in_addr = *in_addr; - - a->link = l; - LIST_PREPEND(addresses, l->addresses, a); - - if (ret) - *ret = a; - - return 0; -} - -LinkAddress *link_address_free(LinkAddress *a) { - if (!a) - return NULL; - - if (a->link) { - LIST_REMOVE(addresses, a->link->addresses, a); - - if (a->llmnr_address_rr) { - if (a->family == AF_INET && a->link->llmnr_ipv4_scope) - dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_address_rr); - else if (a->family == AF_INET6 && a->link->llmnr_ipv6_scope) - dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_address_rr); - } - - if (a->llmnr_ptr_rr) { - if (a->family == AF_INET && a->link->llmnr_ipv4_scope) - dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_ptr_rr); - else if (a->family == AF_INET6 && a->link->llmnr_ipv6_scope) - dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_ptr_rr); - } - } - - dns_resource_record_unref(a->llmnr_address_rr); - dns_resource_record_unref(a->llmnr_ptr_rr); - - return mfree(a); -} - -void link_address_add_rrs(LinkAddress *a, bool force_remove) { - int r; - - assert(a); - - if (a->family == AF_INET) { - - if (!force_remove && - link_address_relevant(a, true) && - a->link->llmnr_ipv4_scope && - a->link->llmnr_support == RESOLVE_SUPPORT_YES && - a->link->manager->llmnr_support == RESOLVE_SUPPORT_YES) { - - if (!a->link->manager->llmnr_host_ipv4_key) { - a->link->manager->llmnr_host_ipv4_key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_A, a->link->manager->llmnr_hostname); - if (!a->link->manager->llmnr_host_ipv4_key) { - r = -ENOMEM; - goto fail; - } - } - - if (!a->llmnr_address_rr) { - a->llmnr_address_rr = dns_resource_record_new(a->link->manager->llmnr_host_ipv4_key); - if (!a->llmnr_address_rr) { - r = -ENOMEM; - goto fail; - } - - a->llmnr_address_rr->a.in_addr = a->in_addr.in; - a->llmnr_address_rr->ttl = LLMNR_DEFAULT_TTL; - } - - if (!a->llmnr_ptr_rr) { - r = dns_resource_record_new_reverse(&a->llmnr_ptr_rr, a->family, &a->in_addr, a->link->manager->llmnr_hostname); - if (r < 0) - goto fail; - - a->llmnr_ptr_rr->ttl = LLMNR_DEFAULT_TTL; - } - - r = dns_zone_put(&a->link->llmnr_ipv4_scope->zone, a->link->llmnr_ipv4_scope, a->llmnr_address_rr, true); - if (r < 0) - log_warning_errno(r, "Failed to add A record to LLMNR zone: %m"); - - r = dns_zone_put(&a->link->llmnr_ipv4_scope->zone, a->link->llmnr_ipv4_scope, a->llmnr_ptr_rr, false); - if (r < 0) - log_warning_errno(r, "Failed to add IPv6 PTR record to LLMNR zone: %m"); - } else { - if (a->llmnr_address_rr) { - if (a->link->llmnr_ipv4_scope) - dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_address_rr); - a->llmnr_address_rr = dns_resource_record_unref(a->llmnr_address_rr); - } - - if (a->llmnr_ptr_rr) { - if (a->link->llmnr_ipv4_scope) - dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_ptr_rr); - a->llmnr_ptr_rr = dns_resource_record_unref(a->llmnr_ptr_rr); - } - } - } - - if (a->family == AF_INET6) { - - if (!force_remove && - link_address_relevant(a, true) && - a->link->llmnr_ipv6_scope && - a->link->llmnr_support == RESOLVE_SUPPORT_YES && - a->link->manager->llmnr_support == RESOLVE_SUPPORT_YES) { - - if (!a->link->manager->llmnr_host_ipv6_key) { - a->link->manager->llmnr_host_ipv6_key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_AAAA, a->link->manager->llmnr_hostname); - if (!a->link->manager->llmnr_host_ipv6_key) { - r = -ENOMEM; - goto fail; - } - } - - if (!a->llmnr_address_rr) { - a->llmnr_address_rr = dns_resource_record_new(a->link->manager->llmnr_host_ipv6_key); - if (!a->llmnr_address_rr) { - r = -ENOMEM; - goto fail; - } - - a->llmnr_address_rr->aaaa.in6_addr = a->in_addr.in6; - a->llmnr_address_rr->ttl = LLMNR_DEFAULT_TTL; - } - - if (!a->llmnr_ptr_rr) { - r = dns_resource_record_new_reverse(&a->llmnr_ptr_rr, a->family, &a->in_addr, a->link->manager->llmnr_hostname); - if (r < 0) - goto fail; - - a->llmnr_ptr_rr->ttl = LLMNR_DEFAULT_TTL; - } - - r = dns_zone_put(&a->link->llmnr_ipv6_scope->zone, a->link->llmnr_ipv6_scope, a->llmnr_address_rr, true); - if (r < 0) - log_warning_errno(r, "Failed to add AAAA record to LLMNR zone: %m"); - - r = dns_zone_put(&a->link->llmnr_ipv6_scope->zone, a->link->llmnr_ipv6_scope, a->llmnr_ptr_rr, false); - if (r < 0) - log_warning_errno(r, "Failed to add IPv6 PTR record to LLMNR zone: %m"); - } else { - if (a->llmnr_address_rr) { - if (a->link->llmnr_ipv6_scope) - dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_address_rr); - a->llmnr_address_rr = dns_resource_record_unref(a->llmnr_address_rr); - } - - if (a->llmnr_ptr_rr) { - if (a->link->llmnr_ipv6_scope) - dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_ptr_rr); - a->llmnr_ptr_rr = dns_resource_record_unref(a->llmnr_ptr_rr); - } - } - } - - return; - -fail: - log_debug_errno(r, "Failed to update address RRs: %m"); -} - -int link_address_update_rtnl(LinkAddress *a, sd_netlink_message *m) { - int r; - assert(a); - assert(m); - - r = sd_rtnl_message_addr_get_flags(m, &a->flags); - if (r < 0) - return r; - - sd_rtnl_message_addr_get_scope(m, &a->scope); - - link_allocate_scopes(a->link); - link_add_rrs(a->link, false); - - return 0; -} - -bool link_address_relevant(LinkAddress *a, bool local_multicast) { - assert(a); - - if (a->flags & (IFA_F_DEPRECATED|IFA_F_TENTATIVE)) - return false; - - if (a->scope >= (local_multicast ? RT_SCOPE_HOST : RT_SCOPE_LINK)) - return false; - - return true; -} - -static bool link_needs_save(Link *l) { - assert(l); - - /* Returns true if any of the settings where set different from the default */ - - if (l->is_managed) - return false; - - if (l->llmnr_support != RESOLVE_SUPPORT_YES || - l->mdns_support != RESOLVE_SUPPORT_NO || - l->dnssec_mode != _DNSSEC_MODE_INVALID) - return true; - - if (l->dns_servers || - l->search_domains) - return true; - - if (!set_isempty(l->dnssec_negative_trust_anchors)) - return true; - - return false; -} - -int link_save_user(Link *l) { - _cleanup_free_ char *temp_path = NULL; - _cleanup_fclose_ FILE *f = NULL; - const char *v; - int r; - - assert(l); - assert(l->state_file); - - if (!link_needs_save(l)) { - (void) unlink(l->state_file); - return 0; - } - - r = mkdir_parents(l->state_file, 0700); - if (r < 0) - goto fail; - - r = fopen_temporary(l->state_file, &f, &temp_path); - if (r < 0) - goto fail; - - fputs("# This is private data. Do not parse.\n", f); - - v = resolve_support_to_string(l->llmnr_support); - if (v) - fprintf(f, "LLMNR=%s\n", v); - - v = resolve_support_to_string(l->mdns_support); - if (v) - fprintf(f, "MDNS=%s\n", v); - - v = dnssec_mode_to_string(l->dnssec_mode); - if (v) - fprintf(f, "DNSSEC=%s\n", v); - - if (l->dns_servers) { - DnsServer *server; - - fputs("SERVERS=", f); - LIST_FOREACH(servers, server, l->dns_servers) { - - if (server != l->dns_servers) - fputc(' ', f); - - v = dns_server_string(server); - if (!v) { - r = -ENOMEM; - goto fail; - } - - fputs(v, f); - } - fputc('\n', f); - } - - if (l->search_domains) { - DnsSearchDomain *domain; - - fputs("DOMAINS=", f); - LIST_FOREACH(domains, domain, l->search_domains) { - - if (domain != l->search_domains) - fputc(' ', f); - - if (domain->route_only) - fputc('~', f); - - fputs(DNS_SEARCH_DOMAIN_NAME(domain), f); - } - fputc('\n', f); - } - - if (!set_isempty(l->dnssec_negative_trust_anchors)) { - bool space = false; - Iterator i; - char *nta; - - fputs("NTAS=", f); - SET_FOREACH(nta, l->dnssec_negative_trust_anchors, i) { - - if (space) - fputc(' ', f); - - fputs(nta, f); - space = true; - } - fputc('\n', f); - } - - r = fflush_and_check(f); - if (r < 0) - goto fail; - - if (rename(temp_path, l->state_file) < 0) { - r = -errno; - goto fail; - } - - return 0; - -fail: - (void) unlink(l->state_file); - - if (temp_path) - (void) unlink(temp_path); - - return log_error_errno(r, "Failed to save link data %s: %m", l->state_file); -} - -int link_load_user(Link *l) { - _cleanup_free_ char - *llmnr = NULL, - *mdns = NULL, - *dnssec = NULL, - *servers = NULL, - *domains = NULL, - *ntas = NULL; - - ResolveSupport s; - int r; - - assert(l); - assert(l->state_file); - - /* Try to load only a single time */ - if (l->loaded) - return 0; - l->loaded = true; - - if (l->is_managed) - return 0; /* if the device is managed, then networkd is our configuration source, not the bus API */ - - r = parse_env_file(l->state_file, NEWLINE, - "LLMNR", &llmnr, - "MDNS", &mdns, - "DNSSEC", &dnssec, - "SERVERS", &servers, - "DOMAINS", &domains, - "NTAS", &ntas, - NULL); - if (r == -ENOENT) - return 0; - if (r < 0) - goto fail; - - link_flush_settings(l); - - /* If we can't recognize the LLMNR or MDNS setting we don't override the default */ - s = resolve_support_from_string(llmnr); - if (s >= 0) - l->llmnr_support = s; - - s = resolve_support_from_string(mdns); - if (s >= 0) - l->mdns_support = s; - - /* If we can't recognize the DNSSEC setting, then set it to invalid, so that the daemon default is used. */ - l->dnssec_mode = dnssec_mode_from_string(dnssec); - - if (servers) { - const char *p = servers; - - for (;;) { - _cleanup_free_ char *word = NULL; - - r = extract_first_word(&p, &word, NULL, 0); - if (r < 0) - goto fail; - if (r == 0) - break; - - r = link_update_dns_server_one(l, word); - if (r < 0) { - log_debug_errno(r, "Failed to load DNS server '%s', ignoring: %m", word); - continue; - } - } - } - - if (domains) { - const char *p = domains; - - for (;;) { - _cleanup_free_ char *word = NULL; - const char *n; - bool is_route; - - r = extract_first_word(&p, &word, NULL, 0); - if (r < 0) - goto fail; - if (r == 0) - break; - - is_route = word[0] == '~'; - n = is_route ? word + 1 : word; - - r = link_update_search_domain_one(l, n, is_route); - if (r < 0) { - log_debug_errno(r, "Failed to load search domain '%s', ignoring: %m", word); - continue; - } - } - } - - if (ntas) { - _cleanup_set_free_free_ Set *ns = NULL; - - ns = set_new(&dns_name_hash_ops); - if (!ns) { - r = -ENOMEM; - goto fail; - } - - r = set_put_strsplit(ns, ntas, NULL, 0); - if (r < 0) - goto fail; - - l->dnssec_negative_trust_anchors = ns; - ns = NULL; - } - - return 0; - -fail: - return log_error_errno(r, "Failed to load link data %s: %m", l->state_file); -} - -void link_remove_user(Link *l) { - assert(l); - assert(l->state_file); - - (void) unlink(l->state_file); -} |