mirror of
https://github.com/systemd/systemd-stable.git
synced 2024-12-22 13:33:56 +03:00
resolved: move LLMNR related functions into separate file
This commit is contained in:
Daniel Mack
parent
f7c735017e
commit
5f402ae84b
@ -5102,6 +5102,8 @@ systemd_resolved_SOURCES = \
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src/resolve/resolved-bus.h \
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src/resolve/resolved-link.h \
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src/resolve/resolved-link.c \
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src/resolve/resolved-llmnr.h \
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src/resolve/resolved-llmnr.c \
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src/resolve/resolved-def.h \
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src/resolve/resolved-dns-rr.h \
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src/resolve/resolved-dns-rr.c \
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@ -28,6 +28,7 @@
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#include "random-util.h"
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#include "hostname-util.h"
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#include "dns-domain.h"
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#include "resolved-llmnr.h"
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#include "resolved-dns-scope.h"
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#define MULTICAST_RATELIMIT_INTERVAL_USEC (1*USEC_PER_SEC)
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473
src/resolve/resolved-llmnr.c
Normal file
473
src/resolve/resolved-llmnr.c
Normal file
@ -0,0 +1,473 @@
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/*-*- 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 <resolv.h>
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#include <netinet/in.h>
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#include "resolved-manager.h"
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#include "resolved-llmnr.h"
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void manager_llmnr_stop(Manager *m) {
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assert(m);
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m->llmnr_ipv4_udp_event_source = sd_event_source_unref(m->llmnr_ipv4_udp_event_source);
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m->llmnr_ipv4_udp_fd = safe_close(m->llmnr_ipv4_udp_fd);
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m->llmnr_ipv6_udp_event_source = sd_event_source_unref(m->llmnr_ipv6_udp_event_source);
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m->llmnr_ipv6_udp_fd = safe_close(m->llmnr_ipv6_udp_fd);
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m->llmnr_ipv4_tcp_event_source = sd_event_source_unref(m->llmnr_ipv4_tcp_event_source);
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m->llmnr_ipv4_tcp_fd = safe_close(m->llmnr_ipv4_tcp_fd);
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m->llmnr_ipv6_tcp_event_source = sd_event_source_unref(m->llmnr_ipv6_tcp_event_source);
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m->llmnr_ipv6_tcp_fd = safe_close(m->llmnr_ipv6_tcp_fd);
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}
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int manager_llmnr_start(Manager *m) {
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int r;
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assert(m);
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if (m->llmnr_support == SUPPORT_NO)
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return 0;
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r = manager_llmnr_ipv4_udp_fd(m);
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if (r == -EADDRINUSE)
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goto eaddrinuse;
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if (r < 0)
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return r;
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r = manager_llmnr_ipv4_tcp_fd(m);
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if (r == -EADDRINUSE)
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goto eaddrinuse;
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if (r < 0)
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return r;
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if (socket_ipv6_is_supported()) {
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r = manager_llmnr_ipv6_udp_fd(m);
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if (r == -EADDRINUSE)
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goto eaddrinuse;
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if (r < 0)
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return r;
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r = manager_llmnr_ipv6_tcp_fd(m);
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if (r == -EADDRINUSE)
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goto eaddrinuse;
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if (r < 0)
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return r;
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}
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return 0;
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eaddrinuse:
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log_warning("There appears to be another LLMNR responder running. Turning off LLMNR support.");
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m->llmnr_support = SUPPORT_NO;
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manager_llmnr_stop(m);
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return 0;
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}
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static int on_llmnr_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
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_cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
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DnsTransaction *t = NULL;
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Manager *m = userdata;
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DnsScope *scope;
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int r;
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r = manager_recv(m, fd, DNS_PROTOCOL_LLMNR, &p);
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if (r <= 0)
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return r;
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scope = manager_find_scope(m, p);
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if (!scope) {
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log_warning("Got LLMNR UDP packet on unknown scope. Ignoring.");
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return 0;
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}
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if (dns_packet_validate_reply(p) > 0) {
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log_debug("Got LLMNR reply packet for id %u", DNS_PACKET_ID(p));
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dns_scope_check_conflicts(scope, p);
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t = hashmap_get(m->dns_transactions, UINT_TO_PTR(DNS_PACKET_ID(p)));
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if (t)
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dns_transaction_process_reply(t, p);
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} else if (dns_packet_validate_query(p) > 0) {
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log_debug("Got LLMNR query packet for id %u", DNS_PACKET_ID(p));
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dns_scope_process_query(scope, NULL, p);
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} else
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log_debug("Invalid LLMNR UDP packet.");
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return 0;
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}
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int manager_llmnr_ipv4_udp_fd(Manager *m) {
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union sockaddr_union sa = {
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.in.sin_family = AF_INET,
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.in.sin_port = htobe16(5355),
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};
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static const int one = 1, pmtu = IP_PMTUDISC_DONT, ttl = 255;
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int r;
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assert(m);
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if (m->llmnr_ipv4_udp_fd >= 0)
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return m->llmnr_ipv4_udp_fd;
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m->llmnr_ipv4_udp_fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
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if (m->llmnr_ipv4_udp_fd < 0)
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return -errno;
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/* RFC 4795, section 2.5 recommends setting the TTL of UDP packets to 255. */
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r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MULTICAST_LOOP, &one, sizeof(one));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = setsockopt(m->llmnr_ipv4_udp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof(one));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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/* Disable Don't-Fragment bit in the IP header */
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r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MTU_DISCOVER, &pmtu, sizeof(pmtu));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = bind(m->llmnr_ipv4_udp_fd, &sa.sa, sizeof(sa.in));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = sd_event_add_io(m->event, &m->llmnr_ipv4_udp_event_source, m->llmnr_ipv4_udp_fd, EPOLLIN, on_llmnr_packet, m);
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if (r < 0)
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goto fail;
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return m->llmnr_ipv4_udp_fd;
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fail:
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m->llmnr_ipv4_udp_fd = safe_close(m->llmnr_ipv4_udp_fd);
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return r;
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}
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int manager_llmnr_ipv6_udp_fd(Manager *m) {
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union sockaddr_union sa = {
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.in6.sin6_family = AF_INET6,
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.in6.sin6_port = htobe16(5355),
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};
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static const int one = 1, ttl = 255;
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int r;
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assert(m);
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if (m->llmnr_ipv6_udp_fd >= 0)
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return m->llmnr_ipv6_udp_fd;
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m->llmnr_ipv6_udp_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
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if (m->llmnr_ipv6_udp_fd < 0)
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return -errno;
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r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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/* RFC 4795, section 2.5 recommends setting the TTL of UDP packets to 255. */
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r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &one, sizeof(one));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = setsockopt(m->llmnr_ipv6_udp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = bind(m->llmnr_ipv6_udp_fd, &sa.sa, sizeof(sa.in6));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = sd_event_add_io(m->event, &m->llmnr_ipv6_udp_event_source, m->llmnr_ipv6_udp_fd, EPOLLIN, on_llmnr_packet, m);
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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return m->llmnr_ipv6_udp_fd;
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fail:
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m->llmnr_ipv6_udp_fd = safe_close(m->llmnr_ipv6_udp_fd);
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return r;
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}
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static int on_llmnr_stream_packet(DnsStream *s) {
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DnsScope *scope;
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assert(s);
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scope = manager_find_scope(s->manager, s->read_packet);
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if (!scope) {
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log_warning("Got LLMNR TCP packet on unknown scope. Ignroing.");
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return 0;
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}
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if (dns_packet_validate_query(s->read_packet) > 0) {
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log_debug("Got query packet for id %u", DNS_PACKET_ID(s->read_packet));
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dns_scope_process_query(scope, s, s->read_packet);
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/* If no reply packet was set, we free the stream */
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if (s->write_packet)
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return 0;
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} else
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log_debug("Invalid LLMNR TCP packet.");
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dns_stream_free(s);
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return 0;
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}
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static int on_llmnr_stream(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
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DnsStream *stream;
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Manager *m = userdata;
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int cfd, r;
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cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
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if (cfd < 0) {
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if (errno == EAGAIN || errno == EINTR)
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return 0;
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return -errno;
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}
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r = dns_stream_new(m, &stream, DNS_PROTOCOL_LLMNR, cfd);
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if (r < 0) {
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safe_close(cfd);
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return r;
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}
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stream->on_packet = on_llmnr_stream_packet;
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return 0;
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}
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int manager_llmnr_ipv4_tcp_fd(Manager *m) {
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union sockaddr_union sa = {
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.in.sin_family = AF_INET,
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.in.sin_port = htobe16(5355),
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};
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static const int one = 1, pmtu = IP_PMTUDISC_DONT;
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int r;
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assert(m);
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if (m->llmnr_ipv4_tcp_fd >= 0)
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return m->llmnr_ipv4_tcp_fd;
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m->llmnr_ipv4_tcp_fd = socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
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if (m->llmnr_ipv4_tcp_fd < 0)
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return -errno;
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/* RFC 4795, section 2.5. requires setting the TTL of TCP streams to 1 */
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r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_TTL, &one, sizeof(one));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = setsockopt(m->llmnr_ipv4_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof(one));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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/* Disable Don't-Fragment bit in the IP header */
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r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_MTU_DISCOVER, &pmtu, sizeof(pmtu));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = bind(m->llmnr_ipv4_tcp_fd, &sa.sa, sizeof(sa.in));
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = listen(m->llmnr_ipv4_tcp_fd, SOMAXCONN);
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if (r < 0) {
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r = -errno;
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goto fail;
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}
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r = sd_event_add_io(m->event, &m->llmnr_ipv4_tcp_event_source, m->llmnr_ipv4_tcp_fd, EPOLLIN, on_llmnr_stream, m);
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if (r < 0)
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goto fail;
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return m->llmnr_ipv4_tcp_fd;
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|
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fail:
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m->llmnr_ipv4_tcp_fd = safe_close(m->llmnr_ipv4_tcp_fd);
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return r;
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}
|
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int manager_llmnr_ipv6_tcp_fd(Manager *m) {
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union sockaddr_union sa = {
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.in6.sin6_family = AF_INET6,
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.in6.sin6_port = htobe16(5355),
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};
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static const int one = 1;
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int r;
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assert(m);
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if (m->llmnr_ipv6_tcp_fd >= 0)
|
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return m->llmnr_ipv6_tcp_fd;
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|
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m->llmnr_ipv6_tcp_fd = socket(AF_INET6, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
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if (m->llmnr_ipv6_tcp_fd < 0)
|
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return -errno;
|
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|
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/* RFC 4795, section 2.5. requires setting the TTL of TCP streams to 1 */
|
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r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &one, sizeof(one));
|
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if (r < 0) {
|
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r = -errno;
|
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goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv6_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = bind(m->llmnr_ipv6_tcp_fd, &sa.sa, sizeof(sa.in6));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = listen(m->llmnr_ipv6_tcp_fd, SOMAXCONN);
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = sd_event_add_io(m->event, &m->llmnr_ipv6_tcp_event_source, m->llmnr_ipv6_tcp_fd, EPOLLIN, on_llmnr_stream, m);
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
return m->llmnr_ipv6_tcp_fd;
|
||||
|
||||
fail:
|
||||
m->llmnr_ipv6_tcp_fd = safe_close(m->llmnr_ipv6_tcp_fd);
|
||||
return r;
|
||||
}
|
||||
32
src/resolve/resolved-llmnr.h
Normal file
32
src/resolve/resolved-llmnr.h
Normal file
@ -0,0 +1,32 @@
|
||||
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
|
||||
|
||||
#pragma once
|
||||
|
||||
/***
|
||||
This file is part of systemd.
|
||||
|
||||
Copyright 2014 Lennart Poettering
|
||||
|
||||
systemd is free software; you can redistribute it and/or modify it
|
||||
under the terms of the GNU Lesser General Public License as published by
|
||||
the Free Software Foundation; either version 2.1 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
systemd is distributed in the hope that it will be useful, but
|
||||
WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public License
|
||||
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
||||
***/
|
||||
|
||||
#include "resolved-manager.h"
|
||||
|
||||
int manager_llmnr_ipv4_udp_fd(Manager *m);
|
||||
int manager_llmnr_ipv6_udp_fd(Manager *m);
|
||||
int manager_llmnr_ipv4_tcp_fd(Manager *m);
|
||||
int manager_llmnr_ipv6_tcp_fd(Manager *m);
|
||||
|
||||
void manager_llmnr_stop(Manager *m);
|
||||
int manager_llmnr_start(Manager *m);
|
||||
@ -38,6 +38,7 @@
|
||||
#include "resolved-conf.h"
|
||||
#include "resolved-bus.h"
|
||||
#include "resolved-manager.h"
|
||||
#include "resolved-llmnr.h"
|
||||
|
||||
#define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
|
||||
|
||||
@ -393,66 +394,6 @@ static int manager_watch_hostname(Manager *m) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void manager_llmnr_stop(Manager *m) {
|
||||
assert(m);
|
||||
|
||||
m->llmnr_ipv4_udp_event_source = sd_event_source_unref(m->llmnr_ipv4_udp_event_source);
|
||||
m->llmnr_ipv4_udp_fd = safe_close(m->llmnr_ipv4_udp_fd);
|
||||
|
||||
m->llmnr_ipv6_udp_event_source = sd_event_source_unref(m->llmnr_ipv6_udp_event_source);
|
||||
m->llmnr_ipv6_udp_fd = safe_close(m->llmnr_ipv6_udp_fd);
|
||||
|
||||
m->llmnr_ipv4_tcp_event_source = sd_event_source_unref(m->llmnr_ipv4_tcp_event_source);
|
||||
m->llmnr_ipv4_tcp_fd = safe_close(m->llmnr_ipv4_tcp_fd);
|
||||
|
||||
m->llmnr_ipv6_tcp_event_source = sd_event_source_unref(m->llmnr_ipv6_tcp_event_source);
|
||||
m->llmnr_ipv6_tcp_fd = safe_close(m->llmnr_ipv6_tcp_fd);
|
||||
}
|
||||
|
||||
static int manager_llmnr_start(Manager *m) {
|
||||
int r;
|
||||
|
||||
assert(m);
|
||||
|
||||
if (m->llmnr_support == SUPPORT_NO)
|
||||
return 0;
|
||||
|
||||
r = manager_llmnr_ipv4_udp_fd(m);
|
||||
if (r == -EADDRINUSE)
|
||||
goto eaddrinuse;
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = manager_llmnr_ipv4_tcp_fd(m);
|
||||
if (r == -EADDRINUSE)
|
||||
goto eaddrinuse;
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
if (socket_ipv6_is_supported()) {
|
||||
r = manager_llmnr_ipv6_udp_fd(m);
|
||||
if (r == -EADDRINUSE)
|
||||
goto eaddrinuse;
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = manager_llmnr_ipv6_tcp_fd(m);
|
||||
if (r == -EADDRINUSE)
|
||||
goto eaddrinuse;
|
||||
if (r < 0)
|
||||
return r;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
eaddrinuse:
|
||||
log_warning("There appears to be another LLMNR responder running. Turning off LLMNR support.");
|
||||
m->llmnr_support = SUPPORT_NO;
|
||||
manager_llmnr_stop(m);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int manager_new(Manager **ret) {
|
||||
_cleanup_(manager_freep) Manager *m = NULL;
|
||||
int r;
|
||||
@ -1316,393 +1257,6 @@ uint32_t manager_find_mtu(Manager *m) {
|
||||
return mtu;
|
||||
}
|
||||
|
||||
static int on_llmnr_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
|
||||
_cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
|
||||
DnsTransaction *t = NULL;
|
||||
Manager *m = userdata;
|
||||
DnsScope *scope;
|
||||
int r;
|
||||
|
||||
r = manager_recv(m, fd, DNS_PROTOCOL_LLMNR, &p);
|
||||
if (r <= 0)
|
||||
return r;
|
||||
|
||||
scope = manager_find_scope(m, p);
|
||||
if (!scope) {
|
||||
log_warning("Got LLMNR UDP packet on unknown scope. Ignoring.");
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (dns_packet_validate_reply(p) > 0) {
|
||||
log_debug("Got reply packet for id %u", DNS_PACKET_ID(p));
|
||||
|
||||
dns_scope_check_conflicts(scope, p);
|
||||
|
||||
t = hashmap_get(m->dns_transactions, UINT_TO_PTR(DNS_PACKET_ID(p)));
|
||||
if (t)
|
||||
dns_transaction_process_reply(t, p);
|
||||
|
||||
} else if (dns_packet_validate_query(p) > 0) {
|
||||
log_debug("Got query packet for id %u", DNS_PACKET_ID(p));
|
||||
|
||||
dns_scope_process_query(scope, NULL, p);
|
||||
} else
|
||||
log_debug("Invalid LLMNR UDP packet.");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int manager_llmnr_ipv4_udp_fd(Manager *m) {
|
||||
union sockaddr_union sa = {
|
||||
.in.sin_family = AF_INET,
|
||||
.in.sin_port = htobe16(5355),
|
||||
};
|
||||
static const int one = 1, pmtu = IP_PMTUDISC_DONT, ttl = 255;
|
||||
int r;
|
||||
|
||||
assert(m);
|
||||
|
||||
if (m->llmnr_ipv4_udp_fd >= 0)
|
||||
return m->llmnr_ipv4_udp_fd;
|
||||
|
||||
m->llmnr_ipv4_udp_fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
|
||||
if (m->llmnr_ipv4_udp_fd < 0)
|
||||
return -errno;
|
||||
|
||||
/* RFC 4795, section 2.5 recommends setting the TTL of UDP packets to 255. */
|
||||
r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MULTICAST_LOOP, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv4_udp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
/* Disable Don't-Fragment bit in the IP header */
|
||||
r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MTU_DISCOVER, &pmtu, sizeof(pmtu));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = bind(m->llmnr_ipv4_udp_fd, &sa.sa, sizeof(sa.in));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = sd_event_add_io(m->event, &m->llmnr_ipv4_udp_event_source, m->llmnr_ipv4_udp_fd, EPOLLIN, on_llmnr_packet, m);
|
||||
if (r < 0)
|
||||
goto fail;
|
||||
|
||||
return m->llmnr_ipv4_udp_fd;
|
||||
|
||||
fail:
|
||||
m->llmnr_ipv4_udp_fd = safe_close(m->llmnr_ipv4_udp_fd);
|
||||
return r;
|
||||
}
|
||||
|
||||
int manager_llmnr_ipv6_udp_fd(Manager *m) {
|
||||
union sockaddr_union sa = {
|
||||
.in6.sin6_family = AF_INET6,
|
||||
.in6.sin6_port = htobe16(5355),
|
||||
};
|
||||
static const int one = 1, ttl = 255;
|
||||
int r;
|
||||
|
||||
assert(m);
|
||||
|
||||
if (m->llmnr_ipv6_udp_fd >= 0)
|
||||
return m->llmnr_ipv6_udp_fd;
|
||||
|
||||
m->llmnr_ipv6_udp_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
|
||||
if (m->llmnr_ipv6_udp_fd < 0)
|
||||
return -errno;
|
||||
|
||||
r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
/* RFC 4795, section 2.5 recommends setting the TTL of UDP packets to 255. */
|
||||
r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv6_udp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = bind(m->llmnr_ipv6_udp_fd, &sa.sa, sizeof(sa.in6));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = sd_event_add_io(m->event, &m->llmnr_ipv6_udp_event_source, m->llmnr_ipv6_udp_fd, EPOLLIN, on_llmnr_packet, m);
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
return m->llmnr_ipv6_udp_fd;
|
||||
|
||||
fail:
|
||||
m->llmnr_ipv6_udp_fd = safe_close(m->llmnr_ipv6_udp_fd);
|
||||
return r;
|
||||
}
|
||||
|
||||
static int on_llmnr_stream_packet(DnsStream *s) {
|
||||
DnsScope *scope;
|
||||
|
||||
assert(s);
|
||||
|
||||
scope = manager_find_scope(s->manager, s->read_packet);
|
||||
if (!scope) {
|
||||
log_warning("Got LLMNR TCP packet on unknown scope. Ignroing.");
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (dns_packet_validate_query(s->read_packet) > 0) {
|
||||
log_debug("Got query packet for id %u", DNS_PACKET_ID(s->read_packet));
|
||||
|
||||
dns_scope_process_query(scope, s, s->read_packet);
|
||||
|
||||
/* If no reply packet was set, we free the stream */
|
||||
if (s->write_packet)
|
||||
return 0;
|
||||
} else
|
||||
log_debug("Invalid LLMNR TCP packet.");
|
||||
|
||||
dns_stream_free(s);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int on_llmnr_stream(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
|
||||
DnsStream *stream;
|
||||
Manager *m = userdata;
|
||||
int cfd, r;
|
||||
|
||||
cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
|
||||
if (cfd < 0) {
|
||||
if (errno == EAGAIN || errno == EINTR)
|
||||
return 0;
|
||||
|
||||
return -errno;
|
||||
}
|
||||
|
||||
r = dns_stream_new(m, &stream, DNS_PROTOCOL_LLMNR, cfd);
|
||||
if (r < 0) {
|
||||
safe_close(cfd);
|
||||
return r;
|
||||
}
|
||||
|
||||
stream->on_packet = on_llmnr_stream_packet;
|
||||
return 0;
|
||||
}
|
||||
|
||||
int manager_llmnr_ipv4_tcp_fd(Manager *m) {
|
||||
union sockaddr_union sa = {
|
||||
.in.sin_family = AF_INET,
|
||||
.in.sin_port = htobe16(5355),
|
||||
};
|
||||
static const int one = 1, pmtu = IP_PMTUDISC_DONT;
|
||||
int r;
|
||||
|
||||
assert(m);
|
||||
|
||||
if (m->llmnr_ipv4_tcp_fd >= 0)
|
||||
return m->llmnr_ipv4_tcp_fd;
|
||||
|
||||
m->llmnr_ipv4_tcp_fd = socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
|
||||
if (m->llmnr_ipv4_tcp_fd < 0)
|
||||
return -errno;
|
||||
|
||||
/* RFC 4795, section 2.5. requires setting the TTL of TCP streams to 1 */
|
||||
r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_TTL, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv4_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
/* Disable Don't-Fragment bit in the IP header */
|
||||
r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_MTU_DISCOVER, &pmtu, sizeof(pmtu));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = bind(m->llmnr_ipv4_tcp_fd, &sa.sa, sizeof(sa.in));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = listen(m->llmnr_ipv4_tcp_fd, SOMAXCONN);
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = sd_event_add_io(m->event, &m->llmnr_ipv4_tcp_event_source, m->llmnr_ipv4_tcp_fd, EPOLLIN, on_llmnr_stream, m);
|
||||
if (r < 0)
|
||||
goto fail;
|
||||
|
||||
return m->llmnr_ipv4_tcp_fd;
|
||||
|
||||
fail:
|
||||
m->llmnr_ipv4_tcp_fd = safe_close(m->llmnr_ipv4_tcp_fd);
|
||||
return r;
|
||||
}
|
||||
|
||||
int manager_llmnr_ipv6_tcp_fd(Manager *m) {
|
||||
union sockaddr_union sa = {
|
||||
.in6.sin6_family = AF_INET6,
|
||||
.in6.sin6_port = htobe16(5355),
|
||||
};
|
||||
static const int one = 1;
|
||||
int r;
|
||||
|
||||
assert(m);
|
||||
|
||||
if (m->llmnr_ipv6_tcp_fd >= 0)
|
||||
return m->llmnr_ipv6_tcp_fd;
|
||||
|
||||
m->llmnr_ipv6_tcp_fd = socket(AF_INET6, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
|
||||
if (m->llmnr_ipv6_tcp_fd < 0)
|
||||
return -errno;
|
||||
|
||||
/* RFC 4795, section 2.5. requires setting the TTL of TCP streams to 1 */
|
||||
r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv6_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = bind(m->llmnr_ipv6_tcp_fd, &sa.sa, sizeof(sa.in6));
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = listen(m->llmnr_ipv6_tcp_fd, SOMAXCONN);
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
r = sd_event_add_io(m->event, &m->llmnr_ipv6_tcp_event_source, m->llmnr_ipv6_tcp_fd, EPOLLIN, on_llmnr_stream, m);
|
||||
if (r < 0) {
|
||||
r = -errno;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
return m->llmnr_ipv6_tcp_fd;
|
||||
|
||||
fail:
|
||||
m->llmnr_ipv6_tcp_fd = safe_close(m->llmnr_ipv6_tcp_fd);
|
||||
return r;
|
||||
}
|
||||
|
||||
int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) {
|
||||
LinkAddress *a;
|
||||
|
||||
|
||||
@ -130,10 +130,6 @@ int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret);
|
||||
|
||||
int manager_dns_ipv4_fd(Manager *m);
|
||||
int manager_dns_ipv6_fd(Manager *m);
|
||||
int manager_llmnr_ipv4_udp_fd(Manager *m);
|
||||
int manager_llmnr_ipv6_udp_fd(Manager *m);
|
||||
int manager_llmnr_ipv4_tcp_fd(Manager *m);
|
||||
int manager_llmnr_ipv6_tcp_fd(Manager *m);
|
||||
|
||||
int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr);
|
||||
LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user