ad6c047561
This adds a DNSSEC= setting to .network files, and makes resolved honour them.
1172 lines
32 KiB
C
1172 lines
32 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2014 Tom Gundersen <teg@jklm.no>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <netinet/in.h>
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#include <poll.h>
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#include <sys/ioctl.h>
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#include "af-list.h"
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#include "alloc-util.h"
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#include "dns-domain.h"
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#include "fd-util.h"
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#include "fileio-label.h"
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#include "hostname-util.h"
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#include "io-util.h"
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#include "netlink-util.h"
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#include "network-internal.h"
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#include "ordered-set.h"
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#include "parse-util.h"
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#include "random-util.h"
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#include "resolved-bus.h"
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#include "resolved-conf.h"
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#include "resolved-llmnr.h"
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#include "resolved-manager.h"
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#include "resolved-resolv-conf.h"
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#include "resolved-mdns.h"
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#include "socket-util.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "utf8.h"
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#define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
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static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
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Manager *m = userdata;
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uint16_t type;
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Link *l;
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int ifindex, r;
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assert(rtnl);
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assert(m);
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assert(mm);
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r = sd_netlink_message_get_type(mm, &type);
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if (r < 0)
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goto fail;
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r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
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if (r < 0)
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goto fail;
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l = hashmap_get(m->links, INT_TO_PTR(ifindex));
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switch (type) {
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case RTM_NEWLINK:{
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bool is_new = !l;
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if (!l) {
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r = link_new(m, &l, ifindex);
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if (r < 0)
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goto fail;
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}
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r = link_update_rtnl(l, mm);
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if (r < 0)
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goto fail;
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r = link_update_monitor(l);
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if (r < 0)
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goto fail;
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if (is_new)
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log_debug("Found new link %i/%s", ifindex, l->name);
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break;
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}
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case RTM_DELLINK:
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if (l) {
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log_debug("Removing link %i/%s", l->ifindex, l->name);
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link_free(l);
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}
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break;
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}
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return 0;
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fail:
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log_warning_errno(r, "Failed to process RTNL link message: %m");
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return 0;
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}
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static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
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Manager *m = userdata;
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union in_addr_union address;
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uint16_t type;
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int r, ifindex, family;
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LinkAddress *a;
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Link *l;
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assert(rtnl);
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assert(mm);
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assert(m);
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r = sd_netlink_message_get_type(mm, &type);
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if (r < 0)
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goto fail;
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r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex);
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if (r < 0)
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goto fail;
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l = hashmap_get(m->links, INT_TO_PTR(ifindex));
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if (!l)
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return 0;
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r = sd_rtnl_message_addr_get_family(mm, &family);
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if (r < 0)
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goto fail;
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switch (family) {
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case AF_INET:
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r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in);
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if (r < 0) {
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r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in);
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if (r < 0)
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goto fail;
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}
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break;
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case AF_INET6:
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r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6);
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if (r < 0) {
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r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6);
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if (r < 0)
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goto fail;
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}
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break;
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default:
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return 0;
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}
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a = link_find_address(l, family, &address);
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switch (type) {
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case RTM_NEWADDR:
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if (!a) {
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r = link_address_new(l, &a, family, &address);
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if (r < 0)
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return r;
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}
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r = link_address_update_rtnl(a, mm);
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if (r < 0)
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return r;
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break;
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case RTM_DELADDR:
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link_address_free(a);
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break;
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}
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return 0;
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fail:
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log_warning_errno(r, "Failed to process RTNL address message: %m");
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return 0;
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}
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static int manager_rtnl_listen(Manager *m) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
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sd_netlink_message *i;
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int r;
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assert(m);
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/* First, subscribe to interfaces coming and going */
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r = sd_netlink_open(&m->rtnl);
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if (r < 0)
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return r;
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r = sd_netlink_attach_event(m->rtnl, m->event, 0);
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if (r < 0)
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return r;
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r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m);
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if (r < 0)
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return r;
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r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m);
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if (r < 0)
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return r;
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r = sd_netlink_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m);
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if (r < 0)
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return r;
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r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m);
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if (r < 0)
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return r;
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/* Then, enumerate all links */
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r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
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if (r < 0)
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return r;
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r = sd_netlink_message_request_dump(req, true);
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if (r < 0)
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return r;
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r = sd_netlink_call(m->rtnl, req, 0, &reply);
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if (r < 0)
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return r;
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for (i = reply; i; i = sd_netlink_message_next(i)) {
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r = manager_process_link(m->rtnl, i, m);
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if (r < 0)
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return r;
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}
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req = sd_netlink_message_unref(req);
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reply = sd_netlink_message_unref(reply);
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/* Finally, enumerate all addresses, too */
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r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
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if (r < 0)
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return r;
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r = sd_netlink_message_request_dump(req, true);
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if (r < 0)
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return r;
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r = sd_netlink_call(m->rtnl, req, 0, &reply);
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if (r < 0)
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return r;
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for (i = reply; i; i = sd_netlink_message_next(i)) {
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r = manager_process_address(m->rtnl, i, m);
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if (r < 0)
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return r;
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}
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return r;
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}
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static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
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Manager *m = userdata;
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Iterator i;
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Link *l;
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int r;
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assert(m);
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sd_network_monitor_flush(m->network_monitor);
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HASHMAP_FOREACH(l, m->links, i) {
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r = link_update_monitor(l);
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if (r < 0)
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log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex);
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}
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r = manager_write_resolv_conf(m);
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if (r < 0)
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log_warning_errno(r, "Could not update resolv.conf: %m");
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return 0;
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}
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static int manager_network_monitor_listen(Manager *m) {
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int r, fd, events;
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assert(m);
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r = sd_network_monitor_new(&m->network_monitor, NULL);
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if (r < 0)
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return r;
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fd = sd_network_monitor_get_fd(m->network_monitor);
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if (fd < 0)
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return fd;
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events = sd_network_monitor_get_events(m->network_monitor);
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if (events < 0)
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return events;
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r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m);
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if (r < 0)
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return r;
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return 0;
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}
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static int determine_hostname(char **llmnr_hostname, char **mdns_hostname) {
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_cleanup_free_ char *h = NULL, *n = NULL;
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char label[DNS_LABEL_MAX];
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const char *p;
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int r, k;
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assert(llmnr_hostname);
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assert(mdns_hostname);
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/* Extract and normalize the first label of the locally
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* configured hostname, and check it's not "localhost". */
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h = gethostname_malloc();
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if (!h)
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return log_oom();
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p = h;
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r = dns_label_unescape(&p, label, sizeof(label));
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if (r < 0)
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return log_error_errno(r, "Failed to unescape host name: %m");
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if (r == 0) {
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log_error("Couldn't find a single label in hosntame.");
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return -EINVAL;
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}
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k = dns_label_undo_idna(label, r, label, sizeof(label));
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if (k < 0)
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return log_error_errno(k, "Failed to undo IDNA: %m");
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if (k > 0)
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r = k;
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if (!utf8_is_valid(label)) {
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log_error("System hostname is not UTF-8 clean.");
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return -EINVAL;
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}
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r = dns_label_escape_new(label, r, &n);
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if (r < 0)
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return log_error_errno(r, "Failed to escape host name: %m");
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if (is_localhost(n)) {
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log_debug("System hostname is 'localhost', ignoring.");
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return -EINVAL;
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}
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r = dns_name_concat(n, "local", mdns_hostname);
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if (r < 0)
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return log_error_errno(r, "Failed to determine mDNS hostname: %m");
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*llmnr_hostname = n;
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n = NULL;
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return 0;
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}
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static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
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_cleanup_free_ char *llmnr_hostname = NULL, *mdns_hostname = NULL;
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Manager *m = userdata;
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int r;
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assert(m);
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r = determine_hostname(&llmnr_hostname, &mdns_hostname);
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if (r < 0)
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return 0; /* ignore invalid hostnames */
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if (streq(llmnr_hostname, m->llmnr_hostname) && streq(mdns_hostname, m->mdns_hostname))
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return 0;
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log_info("System hostname changed to '%s'.", llmnr_hostname);
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free(m->llmnr_hostname);
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free(m->mdns_hostname);
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m->llmnr_hostname = llmnr_hostname;
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m->mdns_hostname = mdns_hostname;
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llmnr_hostname = mdns_hostname = NULL;
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manager_refresh_rrs(m);
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return 0;
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}
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static int manager_watch_hostname(Manager *m) {
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int r;
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assert(m);
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m->hostname_fd = open("/proc/sys/kernel/hostname", O_RDONLY|O_CLOEXEC|O_NDELAY|O_NOCTTY);
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if (m->hostname_fd < 0) {
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log_warning_errno(errno, "Failed to watch hostname: %m");
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return 0;
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}
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r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m);
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if (r < 0) {
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if (r == -EPERM)
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/* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
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m->hostname_fd = safe_close(m->hostname_fd);
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else
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return log_error_errno(r, "Failed to add hostname event source: %m");
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}
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r = determine_hostname(&m->llmnr_hostname, &m->mdns_hostname);
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if (r < 0) {
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log_info("Defaulting to hostname 'linux'.");
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m->llmnr_hostname = strdup("linux");
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if (!m->llmnr_hostname)
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return log_oom();
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m->mdns_hostname = strdup("linux.local");
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if (!m->mdns_hostname)
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return log_oom();
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} else
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log_info("Using system hostname '%s'.", m->llmnr_hostname);
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return 0;
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}
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static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
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_cleanup_free_ char *buffer = NULL;
|
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_cleanup_fclose_ FILE *f = NULL;
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Manager *m = userdata;
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size_t size = 0;
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DnsScope *scope;
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assert(s);
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assert(si);
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assert(m);
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|
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f = open_memstream(&buffer, &size);
|
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if (!f)
|
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return log_oom();
|
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|
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LIST_FOREACH(scopes, scope, m->dns_scopes)
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dns_scope_dump(scope, f);
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|
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if (fflush_and_check(f) < 0)
|
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return log_oom();
|
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|
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log_dump(LOG_INFO, buffer);
|
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return 0;
|
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}
|
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|
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int manager_new(Manager **ret) {
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_cleanup_(manager_freep) Manager *m = NULL;
|
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int r;
|
|
|
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assert(ret);
|
|
|
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m = new0(Manager, 1);
|
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if (!m)
|
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return -ENOMEM;
|
|
|
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m->llmnr_ipv4_udp_fd = m->llmnr_ipv6_udp_fd = -1;
|
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m->llmnr_ipv4_tcp_fd = m->llmnr_ipv6_tcp_fd = -1;
|
|
m->mdns_ipv4_fd = m->mdns_ipv6_fd = -1;
|
|
m->hostname_fd = -1;
|
|
|
|
m->llmnr_support = RESOLVE_SUPPORT_YES;
|
|
m->mdns_support = RESOLVE_SUPPORT_NO;
|
|
m->dnssec_mode = DNSSEC_NO;
|
|
m->read_resolv_conf = true;
|
|
m->need_builtin_fallbacks = true;
|
|
|
|
r = dns_trust_anchor_load(&m->trust_anchor);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = manager_parse_config_file(m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_event_default(&m->event);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
|
|
sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
|
|
|
|
sd_event_set_watchdog(m->event, true);
|
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|
|
r = manager_watch_hostname(m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = manager_network_monitor_listen(m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = manager_rtnl_listen(m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = manager_connect_bus(m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
(void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m);
|
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|
|
*ret = m;
|
|
m = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int manager_start(Manager *m) {
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
r = manager_llmnr_start(m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = manager_mdns_start(m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
Manager *manager_free(Manager *m) {
|
|
Link *l;
|
|
|
|
if (!m)
|
|
return NULL;
|
|
|
|
dns_server_unlink_all(m->dns_servers);
|
|
dns_server_unlink_all(m->fallback_dns_servers);
|
|
dns_search_domain_unlink_all(m->search_domains);
|
|
|
|
while ((l = hashmap_first(m->links)))
|
|
link_free(l);
|
|
|
|
while (m->dns_queries)
|
|
dns_query_free(m->dns_queries);
|
|
|
|
dns_scope_free(m->unicast_scope);
|
|
|
|
hashmap_free(m->links);
|
|
hashmap_free(m->dns_transactions);
|
|
|
|
sd_event_source_unref(m->network_event_source);
|
|
sd_network_monitor_unref(m->network_monitor);
|
|
|
|
sd_netlink_unref(m->rtnl);
|
|
sd_event_source_unref(m->rtnl_event_source);
|
|
|
|
manager_llmnr_stop(m);
|
|
manager_mdns_stop(m);
|
|
|
|
sd_bus_slot_unref(m->prepare_for_sleep_slot);
|
|
sd_event_source_unref(m->bus_retry_event_source);
|
|
sd_bus_unref(m->bus);
|
|
|
|
sd_event_source_unref(m->sigusr1_event_source);
|
|
|
|
sd_event_unref(m->event);
|
|
|
|
dns_resource_key_unref(m->llmnr_host_ipv4_key);
|
|
dns_resource_key_unref(m->llmnr_host_ipv6_key);
|
|
|
|
sd_event_source_unref(m->hostname_event_source);
|
|
safe_close(m->hostname_fd);
|
|
free(m->llmnr_hostname);
|
|
free(m->mdns_hostname);
|
|
|
|
dns_trust_anchor_flush(&m->trust_anchor);
|
|
|
|
free(m);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
|
|
_cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
|
|
union {
|
|
struct cmsghdr header; /* For alignment */
|
|
uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo))
|
|
+ CMSG_SPACE(int) /* ttl/hoplimit */
|
|
+ EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */];
|
|
} control;
|
|
union sockaddr_union sa;
|
|
struct msghdr mh = {};
|
|
struct cmsghdr *cmsg;
|
|
struct iovec iov;
|
|
int ms = 0, r;
|
|
ssize_t l;
|
|
|
|
assert(m);
|
|
assert(fd >= 0);
|
|
assert(ret);
|
|
|
|
r = ioctl(fd, FIONREAD, &ms);
|
|
if (r < 0)
|
|
return -errno;
|
|
if (ms < 0)
|
|
return -EIO;
|
|
|
|
r = dns_packet_new(&p, protocol, ms);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
iov.iov_base = DNS_PACKET_DATA(p);
|
|
iov.iov_len = p->allocated;
|
|
|
|
mh.msg_name = &sa.sa;
|
|
mh.msg_namelen = sizeof(sa);
|
|
mh.msg_iov = &iov;
|
|
mh.msg_iovlen = 1;
|
|
mh.msg_control = &control;
|
|
mh.msg_controllen = sizeof(control);
|
|
|
|
l = recvmsg(fd, &mh, 0);
|
|
if (l < 0) {
|
|
if (errno == EAGAIN || errno == EINTR)
|
|
return 0;
|
|
|
|
return -errno;
|
|
}
|
|
|
|
if (l <= 0)
|
|
return -EIO;
|
|
|
|
assert(!(mh.msg_flags & MSG_CTRUNC));
|
|
assert(!(mh.msg_flags & MSG_TRUNC));
|
|
|
|
p->size = (size_t) l;
|
|
|
|
p->family = sa.sa.sa_family;
|
|
p->ipproto = IPPROTO_UDP;
|
|
if (p->family == AF_INET) {
|
|
p->sender.in = sa.in.sin_addr;
|
|
p->sender_port = be16toh(sa.in.sin_port);
|
|
} else if (p->family == AF_INET6) {
|
|
p->sender.in6 = sa.in6.sin6_addr;
|
|
p->sender_port = be16toh(sa.in6.sin6_port);
|
|
p->ifindex = sa.in6.sin6_scope_id;
|
|
} else
|
|
return -EAFNOSUPPORT;
|
|
|
|
CMSG_FOREACH(cmsg, &mh) {
|
|
|
|
if (cmsg->cmsg_level == IPPROTO_IPV6) {
|
|
assert(p->family == AF_INET6);
|
|
|
|
switch (cmsg->cmsg_type) {
|
|
|
|
case IPV6_PKTINFO: {
|
|
struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
|
|
|
|
if (p->ifindex <= 0)
|
|
p->ifindex = i->ipi6_ifindex;
|
|
|
|
p->destination.in6 = i->ipi6_addr;
|
|
break;
|
|
}
|
|
|
|
case IPV6_HOPLIMIT:
|
|
p->ttl = *(int *) CMSG_DATA(cmsg);
|
|
break;
|
|
|
|
}
|
|
} else if (cmsg->cmsg_level == IPPROTO_IP) {
|
|
assert(p->family == AF_INET);
|
|
|
|
switch (cmsg->cmsg_type) {
|
|
|
|
case IP_PKTINFO: {
|
|
struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
|
|
|
|
if (p->ifindex <= 0)
|
|
p->ifindex = i->ipi_ifindex;
|
|
|
|
p->destination.in = i->ipi_addr;
|
|
break;
|
|
}
|
|
|
|
case IP_TTL:
|
|
p->ttl = *(int *) CMSG_DATA(cmsg);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* The Linux kernel sets the interface index to the loopback
|
|
* device if the packet came from the local host since it
|
|
* avoids the routing table in such a case. Let's unset the
|
|
* interface index in such a case. */
|
|
if (p->ifindex == LOOPBACK_IFINDEX)
|
|
p->ifindex = 0;
|
|
|
|
if (protocol != DNS_PROTOCOL_DNS) {
|
|
/* If we don't know the interface index still, we look for the
|
|
* first local interface with a matching address. Yuck! */
|
|
if (p->ifindex <= 0)
|
|
p->ifindex = manager_find_ifindex(m, p->family, &p->destination);
|
|
}
|
|
|
|
*ret = p;
|
|
p = NULL;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
|
|
int r;
|
|
|
|
assert(fd >= 0);
|
|
assert(mh);
|
|
|
|
for (;;) {
|
|
if (sendmsg(fd, mh, flags) >= 0)
|
|
return 0;
|
|
|
|
if (errno == EINTR)
|
|
continue;
|
|
|
|
if (errno != EAGAIN)
|
|
return -errno;
|
|
|
|
r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
return -ETIMEDOUT;
|
|
}
|
|
}
|
|
|
|
static int write_loop(int fd, void *message, size_t length) {
|
|
int r;
|
|
|
|
assert(fd >= 0);
|
|
assert(message);
|
|
|
|
for (;;) {
|
|
if (write(fd, message, length) >= 0)
|
|
return 0;
|
|
|
|
if (errno == EINTR)
|
|
continue;
|
|
|
|
if (errno != EAGAIN)
|
|
return -errno;
|
|
|
|
r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
return -ETIMEDOUT;
|
|
}
|
|
}
|
|
|
|
int manager_write(Manager *m, int fd, DnsPacket *p) {
|
|
int r;
|
|
|
|
log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p));
|
|
|
|
r = write_loop(fd, DNS_PACKET_DATA(p), p->size);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int manager_ipv4_send(Manager *m, int fd, int ifindex, const struct in_addr *addr, uint16_t port, DnsPacket *p) {
|
|
union sockaddr_union sa = {
|
|
.in.sin_family = AF_INET,
|
|
};
|
|
union {
|
|
struct cmsghdr header; /* For alignment */
|
|
uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))];
|
|
} control;
|
|
struct msghdr mh = {};
|
|
struct iovec iov;
|
|
|
|
assert(m);
|
|
assert(fd >= 0);
|
|
assert(addr);
|
|
assert(port > 0);
|
|
assert(p);
|
|
|
|
iov.iov_base = DNS_PACKET_DATA(p);
|
|
iov.iov_len = p->size;
|
|
|
|
sa.in.sin_addr = *addr;
|
|
sa.in.sin_port = htobe16(port),
|
|
|
|
mh.msg_iov = &iov;
|
|
mh.msg_iovlen = 1;
|
|
mh.msg_name = &sa.sa;
|
|
mh.msg_namelen = sizeof(sa.in);
|
|
|
|
if (ifindex > 0) {
|
|
struct cmsghdr *cmsg;
|
|
struct in_pktinfo *pi;
|
|
|
|
zero(control);
|
|
|
|
mh.msg_control = &control;
|
|
mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo));
|
|
|
|
cmsg = CMSG_FIRSTHDR(&mh);
|
|
cmsg->cmsg_len = mh.msg_controllen;
|
|
cmsg->cmsg_level = IPPROTO_IP;
|
|
cmsg->cmsg_type = IP_PKTINFO;
|
|
|
|
pi = (struct in_pktinfo*) CMSG_DATA(cmsg);
|
|
pi->ipi_ifindex = ifindex;
|
|
}
|
|
|
|
return sendmsg_loop(fd, &mh, 0);
|
|
}
|
|
|
|
static int manager_ipv6_send(Manager *m, int fd, int ifindex, const struct in6_addr *addr, uint16_t port, DnsPacket *p) {
|
|
union sockaddr_union sa = {
|
|
.in6.sin6_family = AF_INET6,
|
|
};
|
|
union {
|
|
struct cmsghdr header; /* For alignment */
|
|
uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))];
|
|
} control;
|
|
struct msghdr mh = {};
|
|
struct iovec iov;
|
|
|
|
assert(m);
|
|
assert(fd >= 0);
|
|
assert(addr);
|
|
assert(port > 0);
|
|
assert(p);
|
|
|
|
iov.iov_base = DNS_PACKET_DATA(p);
|
|
iov.iov_len = p->size;
|
|
|
|
sa.in6.sin6_addr = *addr;
|
|
sa.in6.sin6_port = htobe16(port),
|
|
sa.in6.sin6_scope_id = ifindex;
|
|
|
|
mh.msg_iov = &iov;
|
|
mh.msg_iovlen = 1;
|
|
mh.msg_name = &sa.sa;
|
|
mh.msg_namelen = sizeof(sa.in6);
|
|
|
|
if (ifindex > 0) {
|
|
struct cmsghdr *cmsg;
|
|
struct in6_pktinfo *pi;
|
|
|
|
zero(control);
|
|
|
|
mh.msg_control = &control;
|
|
mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo));
|
|
|
|
cmsg = CMSG_FIRSTHDR(&mh);
|
|
cmsg->cmsg_len = mh.msg_controllen;
|
|
cmsg->cmsg_level = IPPROTO_IPV6;
|
|
cmsg->cmsg_type = IPV6_PKTINFO;
|
|
|
|
pi = (struct in6_pktinfo*) CMSG_DATA(cmsg);
|
|
pi->ipi6_ifindex = ifindex;
|
|
}
|
|
|
|
return sendmsg_loop(fd, &mh, 0);
|
|
}
|
|
|
|
int manager_send(Manager *m, int fd, int ifindex, int family, const union in_addr_union *addr, uint16_t port, DnsPacket *p) {
|
|
assert(m);
|
|
assert(fd >= 0);
|
|
assert(addr);
|
|
assert(port > 0);
|
|
assert(p);
|
|
|
|
log_debug("Sending %s packet with id %" PRIu16 " on interface %i/%s.", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p), ifindex, af_to_name(family));
|
|
|
|
if (family == AF_INET)
|
|
return manager_ipv4_send(m, fd, ifindex, &addr->in, port, p);
|
|
else if (family == AF_INET6)
|
|
return manager_ipv6_send(m, fd, ifindex, &addr->in6, port, p);
|
|
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
|
|
uint32_t manager_find_mtu(Manager *m) {
|
|
uint32_t mtu = 0;
|
|
Link *l;
|
|
Iterator i;
|
|
|
|
/* If we don't know on which link a DNS packet would be
|
|
* delivered, let's find the largest MTU that works on all
|
|
* interfaces we know of */
|
|
|
|
HASHMAP_FOREACH(l, m->links, i) {
|
|
if (l->mtu <= 0)
|
|
continue;
|
|
|
|
if (mtu <= 0 || l->mtu < mtu)
|
|
mtu = l->mtu;
|
|
}
|
|
|
|
return mtu;
|
|
}
|
|
|
|
int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) {
|
|
LinkAddress *a;
|
|
|
|
assert(m);
|
|
|
|
a = manager_find_link_address(m, family, in_addr);
|
|
if (a)
|
|
return a->link->ifindex;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void manager_refresh_rrs(Manager *m) {
|
|
Iterator i;
|
|
Link *l;
|
|
|
|
assert(m);
|
|
|
|
m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key);
|
|
m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key);
|
|
|
|
HASHMAP_FOREACH(l, m->links, i) {
|
|
link_add_rrs(l, true);
|
|
link_add_rrs(l, false);
|
|
}
|
|
}
|
|
|
|
int manager_next_hostname(Manager *m) {
|
|
const char *p;
|
|
uint64_t u, a;
|
|
char *h, *k;
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
p = strchr(m->llmnr_hostname, 0);
|
|
assert(p);
|
|
|
|
while (p > m->llmnr_hostname) {
|
|
if (!strchr("0123456789", p[-1]))
|
|
break;
|
|
|
|
p--;
|
|
}
|
|
|
|
if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0)
|
|
u = 1;
|
|
|
|
/* Add a random number to the old value. This way we can avoid
|
|
* that two hosts pick the same hostname, win on IPv4 and lose
|
|
* on IPv6 (or vice versa), and pick the same hostname
|
|
* replacement hostname, ad infinitum. We still want the
|
|
* numbers to go up monotonically, hence we just add a random
|
|
* value 1..10 */
|
|
|
|
random_bytes(&a, sizeof(a));
|
|
u += 1 + a % 10;
|
|
|
|
if (asprintf(&h, "%.*s%" PRIu64, (int) (p - m->llmnr_hostname), m->llmnr_hostname, u) < 0)
|
|
return -ENOMEM;
|
|
|
|
r = dns_name_concat(h, "local", &k);
|
|
if (r < 0) {
|
|
free(h);
|
|
return r;
|
|
}
|
|
|
|
log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h);
|
|
|
|
free(m->llmnr_hostname);
|
|
m->llmnr_hostname = h;
|
|
|
|
free(m->mdns_hostname);
|
|
m->mdns_hostname = k;
|
|
|
|
manager_refresh_rrs(m);
|
|
|
|
return 0;
|
|
}
|
|
|
|
LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) {
|
|
Iterator i;
|
|
Link *l;
|
|
|
|
assert(m);
|
|
|
|
HASHMAP_FOREACH(l, m->links, i) {
|
|
LinkAddress *a;
|
|
|
|
a = link_find_address(l, family, in_addr);
|
|
if (a)
|
|
return a;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
bool manager_our_packet(Manager *m, DnsPacket *p) {
|
|
assert(m);
|
|
assert(p);
|
|
|
|
return !!manager_find_link_address(m, p->family, &p->sender);
|
|
}
|
|
|
|
DnsScope* manager_find_scope(Manager *m, DnsPacket *p) {
|
|
Link *l;
|
|
|
|
assert(m);
|
|
assert(p);
|
|
|
|
l = hashmap_get(m->links, INT_TO_PTR(p->ifindex));
|
|
if (!l)
|
|
return NULL;
|
|
|
|
switch (p->protocol) {
|
|
case DNS_PROTOCOL_LLMNR:
|
|
if (p->family == AF_INET)
|
|
return l->llmnr_ipv4_scope;
|
|
else if (p->family == AF_INET6)
|
|
return l->llmnr_ipv6_scope;
|
|
|
|
break;
|
|
|
|
case DNS_PROTOCOL_MDNS:
|
|
if (p->family == AF_INET)
|
|
return l->mdns_ipv4_scope;
|
|
else if (p->family == AF_INET6)
|
|
return l->mdns_ipv6_scope;
|
|
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void manager_verify_all(Manager *m) {
|
|
DnsScope *s;
|
|
|
|
assert(m);
|
|
|
|
LIST_FOREACH(scopes, s, m->dns_scopes)
|
|
dns_zone_verify_all(&s->zone);
|
|
}
|
|
|
|
int manager_is_own_hostname(Manager *m, const char *name) {
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(name);
|
|
|
|
if (m->llmnr_hostname) {
|
|
r = dns_name_equal(name, m->llmnr_hostname);
|
|
if (r != 0)
|
|
return r;
|
|
}
|
|
|
|
if (m->mdns_hostname)
|
|
return dns_name_equal(name, m->mdns_hostname);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int manager_compile_dns_servers(Manager *m, OrderedSet **dns) {
|
|
DnsServer *s;
|
|
Iterator i;
|
|
Link *l;
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(dns);
|
|
|
|
r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* First add the system-wide servers and domains */
|
|
LIST_FOREACH(servers, s, m->dns_servers) {
|
|
r = ordered_set_put(*dns, s);
|
|
if (r == -EEXIST)
|
|
continue;
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
/* Then, add the per-link servers */
|
|
HASHMAP_FOREACH(l, m->links, i) {
|
|
LIST_FOREACH(servers, s, l->dns_servers) {
|
|
r = ordered_set_put(*dns, s);
|
|
if (r == -EEXIST)
|
|
continue;
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
/* If we found nothing, add the fallback servers */
|
|
if (ordered_set_isempty(*dns)) {
|
|
LIST_FOREACH(servers, s, m->fallback_dns_servers) {
|
|
r = ordered_set_put(*dns, s);
|
|
if (r == -EEXIST)
|
|
continue;
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int manager_compile_search_domains(Manager *m, OrderedSet **domains) {
|
|
DnsSearchDomain *d;
|
|
Iterator i;
|
|
Link *l;
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(domains);
|
|
|
|
r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
LIST_FOREACH(domains, d, m->search_domains) {
|
|
r = ordered_set_put(*domains, d->name);
|
|
if (r == -EEXIST)
|
|
continue;
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
HASHMAP_FOREACH(l, m->links, i) {
|
|
|
|
LIST_FOREACH(domains, d, l->search_domains) {
|
|
r = ordered_set_put(*domains, d->name);
|
|
if (r == -EEXIST)
|
|
continue;
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|