1552 lines
44 KiB
C
1552 lines
44 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <fcntl.h>
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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 <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#if HAVE_LIBIDN2
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#include <idn2.h>
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#endif
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#include "af-list.h"
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#include "alloc-util.h"
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#include "bus-polkit.h"
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#include "dirent-util.h"
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#include "dns-domain.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "hostname-util.h"
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#include "io-util.h"
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#include "missing_network.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-dns-stub.h"
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#include "resolved-dnssd.h"
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#include "resolved-etc-hosts.h"
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#include "resolved-llmnr.h"
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#include "resolved-manager.h"
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#include "resolved-mdns.h"
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#include "resolved-resolv-conf.h"
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#include "resolved-varlink.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_process_rtnl(l, mm);
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if (r < 0)
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goto fail;
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r = link_update(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->ifname);
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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->ifname);
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link_remove_user(l);
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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, SD_EVENT_PRIORITY_IMPORTANT);
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if (r < 0)
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return r;
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r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, manager_process_link, NULL, m, "resolve-NEWLINK");
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if (r < 0)
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return r;
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r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, manager_process_link, NULL, m, "resolve-DELLINK");
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if (r < 0)
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return r;
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r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWADDR, manager_process_address, NULL, m, "resolve-NEWADDR");
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if (r < 0)
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return r;
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r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELADDR, manager_process_address, NULL, m, "resolve-DELADDR");
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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(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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(void) manager_write_resolv_conf(m);
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(void) manager_send_changed(m, "DNS");
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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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r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5);
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if (r < 0)
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return r;
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(void) sd_event_source_set_description(m->network_event_source, "network-monitor");
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return 0;
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}
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static int determine_hostname(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
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_cleanup_free_ char *h = NULL, *n = NULL;
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#if HAVE_LIBIDN2
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_cleanup_free_ char *utf8 = NULL;
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#elif HAVE_LIBIDN
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int k;
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#endif
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char label[DNS_LABEL_MAX];
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const char *p, *decoded;
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int r;
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assert(full_hostname);
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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 configured hostname, and check it's not "localhost". */
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r = gethostname_strict(&h);
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if (r < 0)
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return log_debug_errno(r, "Can't determine system hostname: %m");
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p = h;
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r = dns_label_unescape(&p, label, sizeof label, 0);
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if (r < 0)
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return log_error_errno(r, "Failed to unescape hostname: %m");
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if (r == 0)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Couldn't find a single label in hostname.");
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#if HAVE_LIBIDN2
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r = idn2_to_unicode_8z8z(label, &utf8, 0);
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if (r != IDN2_OK)
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return log_error("Failed to undo IDNA: %s", idn2_strerror(r));
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assert(utf8_is_valid(utf8));
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r = strlen(utf8);
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decoded = utf8;
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#elif HAVE_LIBIDN
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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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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"System hostname is not UTF-8 clean.");
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decoded = label;
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#else
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decoded = label; /* no decoding */
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#endif
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r = dns_label_escape_new(decoded, r, &n);
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if (r < 0)
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return log_error_errno(r, "Failed to escape hostname: %m");
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if (is_localhost(n))
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return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
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"System hostname is 'localhost', ignoring.");
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r = dns_name_concat(n, "local", 0, 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 = TAKE_PTR(n);
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*full_hostname = TAKE_PTR(h);
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return 0;
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}
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static const char *fallback_hostname(void) {
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/* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be
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* "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */
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if (is_localhost(FALLBACK_HOSTNAME))
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return "linux";
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return FALLBACK_HOSTNAME;
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}
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static int make_fallback_hostnames(char **full_hostname, char **llmnr_hostname, char **mdns_hostname) {
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_cleanup_free_ char *n = NULL, *m = NULL;
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char label[DNS_LABEL_MAX], *h;
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const char *p;
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int r;
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assert(full_hostname);
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assert(llmnr_hostname);
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assert(mdns_hostname);
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p = fallback_hostname();
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r = dns_label_unescape(&p, label, sizeof label, 0);
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if (r < 0)
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return log_error_errno(r, "Failed to unescape fallback hostname: %m");
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assert(r > 0); /* The fallback hostname must have at least one label */
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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 fallback hostname: %m");
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r = dns_name_concat(n, "local", 0, &m);
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if (r < 0)
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return log_error_errno(r, "Failed to concatenate mDNS hostname: %m");
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h = strdup(fallback_hostname());
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if (!h)
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return log_oom();
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*llmnr_hostname = TAKE_PTR(n);
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*mdns_hostname = TAKE_PTR(m);
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*full_hostname = h;
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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 *full_hostname = NULL, *llmnr_hostname = NULL, *mdns_hostname = NULL;
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Manager *m = userdata;
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bool llmnr_hostname_changed;
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int r;
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assert(m);
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r = determine_hostname(&full_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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llmnr_hostname_changed = !streq(llmnr_hostname, m->llmnr_hostname);
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if (streq(full_hostname, m->full_hostname) &&
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!llmnr_hostname_changed &&
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streq(mdns_hostname, m->mdns_hostname))
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return 0;
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log_info("System hostname changed to '%s'.", full_hostname);
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free_and_replace(m->full_hostname, full_hostname);
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free_and_replace(m->llmnr_hostname, llmnr_hostname);
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free_and_replace(m->mdns_hostname, mdns_hostname);
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|
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manager_refresh_rrs(m);
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(void) manager_send_changed(m, "LLMNRHostname");
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return 0;
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}
|
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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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|
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assert(m);
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|
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m->hostname_fd = open("/proc/sys/kernel/hostname",
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O_RDONLY|O_CLOEXEC|O_NONBLOCK|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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|
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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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|
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(void) sd_event_source_set_description(m->hostname_event_source, "hostname");
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|
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r = determine_hostname(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
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if (r < 0) {
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log_info("Defaulting to hostname '%s'.", fallback_hostname());
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|
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r = make_fallback_hostnames(&m->full_hostname, &m->llmnr_hostname, &m->mdns_hostname);
|
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if (r < 0)
|
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return r;
|
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} else
|
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log_info("Using system hostname '%s'.", m->full_hostname);
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|
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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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DnsServer *server;
|
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size_t size = 0;
|
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DnsScope *scope;
|
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Iterator i;
|
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Link *l;
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|
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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_unlocked(&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)
|
|
dns_scope_dump(scope, f);
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|
|
LIST_FOREACH(servers, server, m->dns_servers)
|
|
dns_server_dump(server, f);
|
|
LIST_FOREACH(servers, server, m->fallback_dns_servers)
|
|
dns_server_dump(server, f);
|
|
HASHMAP_FOREACH(l, m->links, i)
|
|
LIST_FOREACH(servers, server, l->dns_servers)
|
|
dns_server_dump(server, f);
|
|
|
|
if (fflush_and_check(f) < 0)
|
|
return log_oom();
|
|
|
|
log_dump(LOG_INFO, buffer);
|
|
return 0;
|
|
}
|
|
|
|
static int manager_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
|
|
Manager *m = userdata;
|
|
|
|
assert(s);
|
|
assert(si);
|
|
assert(m);
|
|
|
|
manager_flush_caches(m);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int manager_sigrtmin1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
|
|
Manager *m = userdata;
|
|
|
|
assert(s);
|
|
assert(si);
|
|
assert(m);
|
|
|
|
manager_reset_server_features(m);
|
|
return 0;
|
|
}
|
|
|
|
int manager_new(Manager **ret) {
|
|
_cleanup_(manager_freep) Manager *m = NULL;
|
|
int r;
|
|
|
|
assert(ret);
|
|
|
|
m = new(Manager, 1);
|
|
if (!m)
|
|
return -ENOMEM;
|
|
|
|
*m = (Manager) {
|
|
.llmnr_ipv4_udp_fd = -1,
|
|
.llmnr_ipv6_udp_fd = -1,
|
|
.llmnr_ipv4_tcp_fd = -1,
|
|
.llmnr_ipv6_tcp_fd = -1,
|
|
.mdns_ipv4_fd = -1,
|
|
.mdns_ipv6_fd = -1,
|
|
.dns_stub_udp_fd = -1,
|
|
.dns_stub_tcp_fd = -1,
|
|
.hostname_fd = -1,
|
|
|
|
.llmnr_support = DEFAULT_LLMNR_MODE,
|
|
.mdns_support = DEFAULT_MDNS_MODE,
|
|
.dnssec_mode = DEFAULT_DNSSEC_MODE,
|
|
.dns_over_tls_mode = DEFAULT_DNS_OVER_TLS_MODE,
|
|
.enable_cache = DNS_CACHE_MODE_YES,
|
|
.dns_stub_listener_mode = DNS_STUB_LISTENER_YES,
|
|
.read_resolv_conf = true,
|
|
.need_builtin_fallbacks = true,
|
|
.etc_hosts_last = USEC_INFINITY,
|
|
.etc_hosts_mtime = USEC_INFINITY,
|
|
.etc_hosts_ino = 0,
|
|
.etc_hosts_dev = 0,
|
|
.read_etc_hosts = true,
|
|
};
|
|
|
|
r = dns_trust_anchor_load(&m->trust_anchor);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = manager_parse_config_file(m);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to parse configuration file: %m");
|
|
|
|
#if ENABLE_DNS_OVER_TLS
|
|
r = dnstls_manager_init(m);
|
|
if (r < 0)
|
|
return r;
|
|
#endif
|
|
|
|
r = sd_event_default(&m->event);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
(void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
|
|
(void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
|
|
|
|
(void) sd_event_set_watchdog(m->event, true);
|
|
|
|
r = manager_watch_hostname(m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dnssd_load(m);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to load DNS-SD configuration files: %m");
|
|
|
|
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);
|
|
(void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m);
|
|
(void) sd_event_add_signal(m->event, &m->sigrtmin1_event_source, SIGRTMIN+1, manager_sigrtmin1, m);
|
|
|
|
manager_cleanup_saved_user(m);
|
|
|
|
*ret = TAKE_PTR(m);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int manager_start(Manager *m) {
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
r = manager_dns_stub_start(m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = manager_varlink_init(m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
Manager *manager_free(Manager *m) {
|
|
Link *l;
|
|
DnssdService *s;
|
|
|
|
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);
|
|
|
|
/* At this point only orphaned streams should remain. All others should have been freed already by their
|
|
* owners */
|
|
while (m->dns_streams)
|
|
dns_stream_unref(m->dns_streams);
|
|
|
|
#if ENABLE_DNS_OVER_TLS
|
|
dnstls_manager_free(m);
|
|
#endif
|
|
|
|
hashmap_free(m->links);
|
|
hashmap_free(m->dns_transactions);
|
|
ordered_set_free(m->dns_extra_stub_listeners);
|
|
|
|
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);
|
|
manager_dns_stub_stop(m);
|
|
manager_varlink_done(m);
|
|
|
|
manager_dns_stub_stop_extra(m);
|
|
|
|
bus_verify_polkit_async_registry_free(m->polkit_registry);
|
|
|
|
sd_bus_flush_close_unref(m->bus);
|
|
|
|
sd_event_source_unref(m->sigusr1_event_source);
|
|
sd_event_source_unref(m->sigusr2_event_source);
|
|
sd_event_source_unref(m->sigrtmin1_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);
|
|
dns_resource_key_unref(m->mdns_host_ipv4_key);
|
|
dns_resource_key_unref(m->mdns_host_ipv6_key);
|
|
|
|
sd_event_source_unref(m->hostname_event_source);
|
|
safe_close(m->hostname_fd);
|
|
|
|
free(m->full_hostname);
|
|
free(m->llmnr_hostname);
|
|
free(m->mdns_hostname);
|
|
|
|
while ((s = hashmap_first(m->dnssd_services)))
|
|
dnssd_service_free(s);
|
|
hashmap_free(m->dnssd_services);
|
|
|
|
dns_trust_anchor_flush(&m->trust_anchor);
|
|
manager_etc_hosts_flush(m);
|
|
|
|
return mfree(m);
|
|
}
|
|
|
|
int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
|
|
_cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
|
|
CMSG_BUFFER_TYPE(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 iovec iov;
|
|
struct msghdr mh = {
|
|
.msg_name = &sa.sa,
|
|
.msg_namelen = sizeof(sa),
|
|
.msg_iov = &iov,
|
|
.msg_iovlen = 1,
|
|
.msg_control = &control,
|
|
.msg_controllen = sizeof(control),
|
|
};
|
|
struct cmsghdr *cmsg;
|
|
ssize_t ms, l;
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(fd >= 0);
|
|
assert(ret);
|
|
|
|
ms = next_datagram_size_fd(fd);
|
|
if (ms < 0)
|
|
return ms;
|
|
|
|
r = dns_packet_new(&p, protocol, ms, DNS_PACKET_SIZE_MAX);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->allocated);
|
|
|
|
l = recvmsg_safe(fd, &mh, 0);
|
|
if (IN_SET(l, -EAGAIN, -EINTR))
|
|
return 0;
|
|
if (l < 0)
|
|
return l;
|
|
if (l == 0)
|
|
return 0;
|
|
|
|
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 = TAKE_PTR(p);
|
|
|
|
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 *destination,
|
|
uint16_t port,
|
|
const struct in_addr *source,
|
|
DnsPacket *p) {
|
|
|
|
CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in_pktinfo))) control = {};
|
|
union sockaddr_union sa;
|
|
struct iovec iov;
|
|
struct msghdr mh = {
|
|
.msg_iov = &iov,
|
|
.msg_iovlen = 1,
|
|
.msg_name = &sa.sa,
|
|
.msg_namelen = sizeof(sa.in),
|
|
};
|
|
|
|
assert(m);
|
|
assert(fd >= 0);
|
|
assert(destination);
|
|
assert(port > 0);
|
|
assert(p);
|
|
|
|
iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size);
|
|
|
|
sa = (union sockaddr_union) {
|
|
.in.sin_family = AF_INET,
|
|
.in.sin_addr = *destination,
|
|
.in.sin_port = htobe16(port),
|
|
};
|
|
|
|
if (ifindex > 0) {
|
|
struct cmsghdr *cmsg;
|
|
struct in_pktinfo *pi;
|
|
|
|
mh.msg_control = &control;
|
|
mh.msg_controllen = sizeof(control);
|
|
|
|
cmsg = CMSG_FIRSTHDR(&mh);
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
|
|
cmsg->cmsg_level = IPPROTO_IP;
|
|
cmsg->cmsg_type = IP_PKTINFO;
|
|
|
|
pi = (struct in_pktinfo*) CMSG_DATA(cmsg);
|
|
pi->ipi_ifindex = ifindex;
|
|
|
|
if (source)
|
|
pi->ipi_spec_dst = *source;
|
|
}
|
|
|
|
return sendmsg_loop(fd, &mh, 0);
|
|
}
|
|
|
|
static int manager_ipv6_send(
|
|
Manager *m,
|
|
int fd,
|
|
int ifindex,
|
|
const struct in6_addr *destination,
|
|
uint16_t port,
|
|
const struct in6_addr *source,
|
|
DnsPacket *p) {
|
|
|
|
CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in6_pktinfo))) control = {};
|
|
union sockaddr_union sa;
|
|
struct iovec iov;
|
|
struct msghdr mh = {
|
|
.msg_iov = &iov,
|
|
.msg_iovlen = 1,
|
|
.msg_name = &sa.sa,
|
|
.msg_namelen = sizeof(sa.in6),
|
|
};
|
|
|
|
assert(m);
|
|
assert(fd >= 0);
|
|
assert(destination);
|
|
assert(port > 0);
|
|
assert(p);
|
|
|
|
iov = IOVEC_MAKE(DNS_PACKET_DATA(p), p->size);
|
|
|
|
sa = (union sockaddr_union) {
|
|
.in6.sin6_family = AF_INET6,
|
|
.in6.sin6_addr = *destination,
|
|
.in6.sin6_port = htobe16(port),
|
|
.in6.sin6_scope_id = ifindex,
|
|
};
|
|
|
|
if (ifindex > 0) {
|
|
struct cmsghdr *cmsg;
|
|
struct in6_pktinfo *pi;
|
|
|
|
mh.msg_control = &control;
|
|
mh.msg_controllen = sizeof(control);
|
|
|
|
cmsg = CMSG_FIRSTHDR(&mh);
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
|
|
cmsg->cmsg_level = IPPROTO_IPV6;
|
|
cmsg->cmsg_type = IPV6_PKTINFO;
|
|
|
|
pi = (struct in6_pktinfo*) CMSG_DATA(cmsg);
|
|
pi->ipi6_ifindex = ifindex;
|
|
|
|
if (source)
|
|
pi->ipi6_addr = *source;
|
|
}
|
|
|
|
return sendmsg_loop(fd, &mh, 0);
|
|
}
|
|
|
|
int manager_send(
|
|
Manager *m,
|
|
int fd,
|
|
int ifindex,
|
|
int family,
|
|
const union in_addr_union *destination,
|
|
uint16_t port,
|
|
const union in_addr_union *source,
|
|
DnsPacket *p) {
|
|
|
|
assert(m);
|
|
assert(fd >= 0);
|
|
assert(destination);
|
|
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, &destination->in, port, source ? &source->in : NULL, p);
|
|
if (family == AF_INET6)
|
|
return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, source ? &source->in6 : NULL, 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;
|
|
DnssdService *s;
|
|
|
|
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);
|
|
m->mdns_host_ipv4_key = dns_resource_key_unref(m->mdns_host_ipv4_key);
|
|
m->mdns_host_ipv6_key = dns_resource_key_unref(m->mdns_host_ipv6_key);
|
|
|
|
if (m->mdns_support == RESOLVE_SUPPORT_YES)
|
|
HASHMAP_FOREACH(s, m->dnssd_services, i)
|
|
if (dnssd_update_rrs(s) < 0)
|
|
log_warning("Failed to refresh DNS-SD service '%s'", s->name);
|
|
|
|
HASHMAP_FOREACH(l, m->links, i) {
|
|
link_add_rrs(l, true);
|
|
link_add_rrs(l, false);
|
|
}
|
|
}
|
|
|
|
static int manager_next_random_name(const char *old, char **ret_new) {
|
|
const char *p;
|
|
uint64_t u, a;
|
|
char *n;
|
|
|
|
p = strchr(old, 0);
|
|
assert(p);
|
|
|
|
while (p > old) {
|
|
if (!strchr(DIGITS, 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(&n, "%.*s%" PRIu64, (int) (p - old), old, u) < 0)
|
|
return -ENOMEM;
|
|
|
|
*ret_new = n;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int manager_next_hostname(Manager *m) {
|
|
_cleanup_free_ char *h = NULL, *k = NULL;
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
r = manager_next_random_name(m->llmnr_hostname, &h);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dns_name_concat(h, "local", 0, &k);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h);
|
|
|
|
free_and_replace(m->llmnr_hostname, h);
|
|
free_and_replace(m->mdns_hostname, k);
|
|
|
|
manager_refresh_rrs(m);
|
|
(void) manager_send_changed(m, "LLMNRHostname");
|
|
|
|
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) {
|
|
r = dns_name_equal(name, m->mdns_hostname);
|
|
if (r != 0)
|
|
return r;
|
|
}
|
|
|
|
if (m->full_hostname)
|
|
return dns_name_equal(name, m->full_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;
|
|
}
|
|
|
|
/* filter_route is a tri-state:
|
|
* < 0: no filtering
|
|
* = 0 or false: return only domains which should be used for searching
|
|
* > 0 or true: return only domains which are for routing only
|
|
*/
|
|
int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route) {
|
|
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) {
|
|
|
|
if (filter_route >= 0 &&
|
|
d->route_only != !!filter_route)
|
|
continue;
|
|
|
|
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) {
|
|
|
|
if (filter_route >= 0 &&
|
|
d->route_only != !!filter_route)
|
|
continue;
|
|
|
|
r = ordered_set_put(*domains, d->name);
|
|
if (r == -EEXIST)
|
|
continue;
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
DnssecMode manager_get_dnssec_mode(Manager *m) {
|
|
assert(m);
|
|
|
|
if (m->dnssec_mode != _DNSSEC_MODE_INVALID)
|
|
return m->dnssec_mode;
|
|
|
|
return DNSSEC_NO;
|
|
}
|
|
|
|
bool manager_dnssec_supported(Manager *m) {
|
|
DnsServer *server;
|
|
Iterator i;
|
|
Link *l;
|
|
|
|
assert(m);
|
|
|
|
if (manager_get_dnssec_mode(m) == DNSSEC_NO)
|
|
return false;
|
|
|
|
server = manager_get_dns_server(m);
|
|
if (server && !dns_server_dnssec_supported(server))
|
|
return false;
|
|
|
|
HASHMAP_FOREACH(l, m->links, i)
|
|
if (!link_dnssec_supported(l))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
DnsOverTlsMode manager_get_dns_over_tls_mode(Manager *m) {
|
|
assert(m);
|
|
|
|
if (m->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
|
|
return m->dns_over_tls_mode;
|
|
|
|
return DNS_OVER_TLS_NO;
|
|
}
|
|
|
|
void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) {
|
|
|
|
assert(verdict >= 0);
|
|
assert(verdict < _DNSSEC_VERDICT_MAX);
|
|
|
|
if (DEBUG_LOGGING) {
|
|
char s[DNS_RESOURCE_KEY_STRING_MAX];
|
|
|
|
log_debug("Found verdict for lookup %s: %s",
|
|
dns_resource_key_to_string(key, s, sizeof s),
|
|
dnssec_verdict_to_string(verdict));
|
|
}
|
|
|
|
m->n_dnssec_verdict[verdict]++;
|
|
}
|
|
|
|
bool manager_routable(Manager *m, int family) {
|
|
Iterator i;
|
|
Link *l;
|
|
|
|
assert(m);
|
|
|
|
/* Returns true if the host has at least one interface with a routable address of the specified type */
|
|
|
|
HASHMAP_FOREACH(l, m->links, i)
|
|
if (link_relevant(l, family, false))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
void manager_flush_caches(Manager *m) {
|
|
DnsScope *scope;
|
|
|
|
assert(m);
|
|
|
|
LIST_FOREACH(scopes, scope, m->dns_scopes)
|
|
dns_cache_flush(&scope->cache);
|
|
|
|
log_info("Flushed all caches.");
|
|
}
|
|
|
|
void manager_reset_server_features(Manager *m) {
|
|
Iterator i;
|
|
Link *l;
|
|
|
|
dns_server_reset_features_all(m->dns_servers);
|
|
dns_server_reset_features_all(m->fallback_dns_servers);
|
|
|
|
HASHMAP_FOREACH(l, m->links, i)
|
|
dns_server_reset_features_all(l->dns_servers);
|
|
|
|
log_info("Resetting learnt feature levels on all servers.");
|
|
}
|
|
|
|
void manager_cleanup_saved_user(Manager *m) {
|
|
_cleanup_closedir_ DIR *d = NULL;
|
|
struct dirent *de;
|
|
|
|
assert(m);
|
|
|
|
/* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface
|
|
* anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can
|
|
* be restarted without losing this data. */
|
|
|
|
d = opendir("/run/systemd/resolve/netif/");
|
|
if (!d) {
|
|
if (errno == ENOENT)
|
|
return;
|
|
|
|
log_warning_errno(errno, "Failed to open interface directory: %m");
|
|
return;
|
|
}
|
|
|
|
FOREACH_DIRENT_ALL(de, d, log_error_errno(errno, "Failed to read interface directory: %m")) {
|
|
_cleanup_free_ char *p = NULL;
|
|
int ifindex;
|
|
Link *l;
|
|
|
|
if (!IN_SET(de->d_type, DT_UNKNOWN, DT_REG))
|
|
continue;
|
|
|
|
if (dot_or_dot_dot(de->d_name))
|
|
continue;
|
|
|
|
ifindex = parse_ifindex(de->d_name);
|
|
if (ifindex < 0) /* Probably some temporary file from a previous run. Delete it */
|
|
goto rm;
|
|
|
|
l = hashmap_get(m->links, INT_TO_PTR(ifindex));
|
|
if (!l) /* link vanished */
|
|
goto rm;
|
|
|
|
if (l->is_managed) /* now managed by networkd, hence the bus settings are useless */
|
|
goto rm;
|
|
|
|
continue;
|
|
|
|
rm:
|
|
p = path_join("/run/systemd/resolve/netif", de->d_name);
|
|
if (!p) {
|
|
log_oom();
|
|
return;
|
|
}
|
|
|
|
(void) unlink(p);
|
|
}
|
|
}
|
|
|
|
bool manager_next_dnssd_names(Manager *m) {
|
|
Iterator i;
|
|
DnssdService *s;
|
|
bool tried = false;
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
HASHMAP_FOREACH(s, m->dnssd_services, i) {
|
|
_cleanup_free_ char * new_name = NULL;
|
|
|
|
if (!s->withdrawn)
|
|
continue;
|
|
|
|
r = manager_next_random_name(s->name_template, &new_name);
|
|
if (r < 0) {
|
|
log_warning_errno(r, "Failed to get new name for service '%s': %m", s->name);
|
|
continue;
|
|
}
|
|
|
|
free_and_replace(s->name_template, new_name);
|
|
|
|
s->withdrawn = false;
|
|
|
|
tried = true;
|
|
}
|
|
|
|
if (tried)
|
|
manager_refresh_rrs(m);
|
|
|
|
return tried;
|
|
}
|