diff options
Diffstat (limited to 'src/resolve/resolved-manager.c')
| -rw-r--r-- | src/resolve/resolved-manager.c | 1377 |
1 files changed, 0 insertions, 1377 deletions
diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c deleted file mode 100644 index 6630585d13..0000000000 --- a/src/resolve/resolved-manager.c +++ /dev/null @@ -1,1377 +0,0 @@ -/*** - This file is part of systemd. - - Copyright 2014 Tom Gundersen <teg@jklm.no> - - 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 <netinet/in.h> -#include <poll.h> -#include <sys/ioctl.h> - -#include "af-list.h" -#include "alloc-util.h" -#include "dirent-util.h" -#include "dns-domain.h" -#include "fd-util.h" -#include "fileio-label.h" -#include "hostname-util.h" -#include "io-util.h" -#include "netlink-util.h" -#include "network-internal.h" -#include "ordered-set.h" -#include "parse-util.h" -#include "random-util.h" -#include "resolved-bus.h" -#include "resolved-conf.h" -#include "resolved-dns-stub.h" -#include "resolved-etc-hosts.h" -#include "resolved-llmnr.h" -#include "resolved-manager.h" -#include "resolved-mdns.h" -#include "resolved-resolv-conf.h" -#include "socket-util.h" -#include "string-table.h" -#include "string-util.h" -#include "utf8.h" - -#define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC) - -static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { - Manager *m = userdata; - uint16_t type; - Link *l; - int ifindex, r; - - assert(rtnl); - assert(m); - assert(mm); - - r = sd_netlink_message_get_type(mm, &type); - if (r < 0) - goto fail; - - r = sd_rtnl_message_link_get_ifindex(mm, &ifindex); - if (r < 0) - goto fail; - - l = hashmap_get(m->links, INT_TO_PTR(ifindex)); - - switch (type) { - - case RTM_NEWLINK:{ - bool is_new = !l; - - if (!l) { - r = link_new(m, &l, ifindex); - if (r < 0) - goto fail; - } - - r = link_process_rtnl(l, mm); - if (r < 0) - goto fail; - - r = link_update(l); - if (r < 0) - goto fail; - - if (is_new) - log_debug("Found new link %i/%s", ifindex, l->name); - - break; - } - - case RTM_DELLINK: - if (l) { - log_debug("Removing link %i/%s", l->ifindex, l->name); - link_remove_user(l); - link_free(l); - } - - break; - } - - return 0; - -fail: - log_warning_errno(r, "Failed to process RTNL link message: %m"); - return 0; -} - -static int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { - Manager *m = userdata; - union in_addr_union address; - uint16_t type; - int r, ifindex, family; - LinkAddress *a; - Link *l; - - assert(rtnl); - assert(mm); - assert(m); - - r = sd_netlink_message_get_type(mm, &type); - if (r < 0) - goto fail; - - r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex); - if (r < 0) - goto fail; - - l = hashmap_get(m->links, INT_TO_PTR(ifindex)); - if (!l) - return 0; - - r = sd_rtnl_message_addr_get_family(mm, &family); - if (r < 0) - goto fail; - - switch (family) { - - case AF_INET: - r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in); - if (r < 0) { - r = sd_netlink_message_read_in_addr(mm, IFA_ADDRESS, &address.in); - if (r < 0) - goto fail; - } - - break; - - case AF_INET6: - r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6); - if (r < 0) { - r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6); - if (r < 0) - goto fail; - } - - break; - - default: - return 0; - } - - a = link_find_address(l, family, &address); - - switch (type) { - - case RTM_NEWADDR: - - if (!a) { - r = link_address_new(l, &a, family, &address); - if (r < 0) - return r; - } - - r = link_address_update_rtnl(a, mm); - if (r < 0) - return r; - - break; - - case RTM_DELADDR: - link_address_free(a); - break; - } - - return 0; - -fail: - log_warning_errno(r, "Failed to process RTNL address message: %m"); - return 0; -} - -static int manager_rtnl_listen(Manager *m) { - _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL; - sd_netlink_message *i; - int r; - - assert(m); - - /* First, subscribe to interfaces coming and going */ - r = sd_netlink_open(&m->rtnl); - if (r < 0) - return r; - - r = sd_netlink_attach_event(m->rtnl, m->event, SD_EVENT_PRIORITY_IMPORTANT); - if (r < 0) - return r; - - r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m); - if (r < 0) - return r; - - r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m); - if (r < 0) - return r; - - r = sd_netlink_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m); - if (r < 0) - return r; - - r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m); - if (r < 0) - return r; - - /* Then, enumerate all links */ - r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); - if (r < 0) - return r; - - r = sd_netlink_message_request_dump(req, true); - if (r < 0) - return r; - - r = sd_netlink_call(m->rtnl, req, 0, &reply); - if (r < 0) - return r; - - for (i = reply; i; i = sd_netlink_message_next(i)) { - r = manager_process_link(m->rtnl, i, m); - if (r < 0) - return r; - } - - req = sd_netlink_message_unref(req); - reply = sd_netlink_message_unref(reply); - - /* Finally, enumerate all addresses, too */ - r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC); - if (r < 0) - return r; - - r = sd_netlink_message_request_dump(req, true); - if (r < 0) - return r; - - r = sd_netlink_call(m->rtnl, req, 0, &reply); - if (r < 0) - return r; - - for (i = reply; i; i = sd_netlink_message_next(i)) { - r = manager_process_address(m->rtnl, i, m); - if (r < 0) - return r; - } - - return r; -} - -static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { - Manager *m = userdata; - Iterator i; - Link *l; - int r; - - assert(m); - - sd_network_monitor_flush(m->network_monitor); - - HASHMAP_FOREACH(l, m->links, i) { - r = link_update(l); - if (r < 0) - log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex); - } - - (void) manager_write_resolv_conf(m); - - return 0; -} - -static int manager_network_monitor_listen(Manager *m) { - int r, fd, events; - - assert(m); - - r = sd_network_monitor_new(&m->network_monitor, NULL); - if (r < 0) - return r; - - fd = sd_network_monitor_get_fd(m->network_monitor); - if (fd < 0) - return fd; - - events = sd_network_monitor_get_events(m->network_monitor); - if (events < 0) - return events; - - r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m); - if (r < 0) - return r; - - r = sd_event_source_set_priority(m->network_event_source, SD_EVENT_PRIORITY_IMPORTANT+5); - if (r < 0) - return r; - - (void) sd_event_source_set_description(m->network_event_source, "network-monitor"); - - return 0; -} - -static int determine_hostname(char **llmnr_hostname, char **mdns_hostname) { - _cleanup_free_ char *h = NULL, *n = NULL; - char label[DNS_LABEL_MAX]; - const char *p; - int r, k; - - assert(llmnr_hostname); - assert(mdns_hostname); - - /* Extract and normalize the first label of the locally - * configured hostname, and check it's not "localhost". */ - - h = gethostname_malloc(); - if (!h) - return log_oom(); - - p = h; - r = dns_label_unescape(&p, label, sizeof(label)); - if (r < 0) - return log_error_errno(r, "Failed to unescape host name: %m"); - if (r == 0) { - log_error("Couldn't find a single label in hosntame."); - return -EINVAL; - } - - k = dns_label_undo_idna(label, r, label, sizeof(label)); - if (k < 0) - return log_error_errno(k, "Failed to undo IDNA: %m"); - if (k > 0) - r = k; - - if (!utf8_is_valid(label)) { - log_error("System hostname is not UTF-8 clean."); - return -EINVAL; - } - - r = dns_label_escape_new(label, r, &n); - if (r < 0) - return log_error_errno(r, "Failed to escape host name: %m"); - - if (is_localhost(n)) { - log_debug("System hostname is 'localhost', ignoring."); - return -EINVAL; - } - - r = dns_name_concat(n, "local", mdns_hostname); - if (r < 0) - return log_error_errno(r, "Failed to determine mDNS hostname: %m"); - - *llmnr_hostname = n; - n = NULL; - - return 0; -} - -static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) { - _cleanup_free_ char *llmnr_hostname = NULL, *mdns_hostname = NULL; - Manager *m = userdata; - int r; - - assert(m); - - r = determine_hostname(&llmnr_hostname, &mdns_hostname); - if (r < 0) - return 0; /* ignore invalid hostnames */ - - if (streq(llmnr_hostname, m->llmnr_hostname) && streq(mdns_hostname, m->mdns_hostname)) - return 0; - - log_info("System hostname changed to '%s'.", llmnr_hostname); - - free(m->llmnr_hostname); - free(m->mdns_hostname); - - m->llmnr_hostname = llmnr_hostname; - m->mdns_hostname = mdns_hostname; - - llmnr_hostname = mdns_hostname = NULL; - - manager_refresh_rrs(m); - - return 0; -} - -static int manager_watch_hostname(Manager *m) { - int r; - - assert(m); - - m->hostname_fd = open("/proc/sys/kernel/hostname", O_RDONLY|O_CLOEXEC|O_NDELAY|O_NOCTTY); - if (m->hostname_fd < 0) { - log_warning_errno(errno, "Failed to watch hostname: %m"); - return 0; - } - - r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m); - if (r < 0) { - if (r == -EPERM) - /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */ - m->hostname_fd = safe_close(m->hostname_fd); - else - return log_error_errno(r, "Failed to add hostname event source: %m"); - } - - (void) sd_event_source_set_description(m->hostname_event_source, "hostname"); - - r = determine_hostname(&m->llmnr_hostname, &m->mdns_hostname); - if (r < 0) { - log_info("Defaulting to hostname 'gnu-linux'."); - m->llmnr_hostname = strdup("gnu-linux"); - if (!m->llmnr_hostname) - return log_oom(); - - m->mdns_hostname = strdup("gnu-linux.local"); - if (!m->mdns_hostname) - return log_oom(); - } else - log_info("Using system hostname '%s'.", m->llmnr_hostname); - - return 0; -} - -static int manager_sigusr1(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { - _cleanup_free_ char *buffer = NULL; - _cleanup_fclose_ FILE *f = NULL; - Manager *m = userdata; - size_t size = 0; - DnsScope *scope; - - assert(s); - assert(si); - assert(m); - - f = open_memstream(&buffer, &size); - if (!f) - return log_oom(); - - LIST_FOREACH(scopes, scope, m->dns_scopes) - dns_scope_dump(scope, 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; -} - -int manager_new(Manager **ret) { - _cleanup_(manager_freep) Manager *m = NULL; - int r; - - assert(ret); - - m = new0(Manager, 1); - if (!m) - return -ENOMEM; - - m->llmnr_ipv4_udp_fd = m->llmnr_ipv6_udp_fd = -1; - m->llmnr_ipv4_tcp_fd = m->llmnr_ipv6_tcp_fd = -1; - m->mdns_ipv4_fd = m->mdns_ipv6_fd = -1; - m->dns_stub_udp_fd = m->dns_stub_tcp_fd = -1; - m->hostname_fd = -1; - - m->llmnr_support = RESOLVE_SUPPORT_YES; - m->mdns_support = RESOLVE_SUPPORT_NO; - m->dnssec_mode = DEFAULT_DNSSEC_MODE; - m->enable_cache = true; - m->dns_stub_listener_mode = DNS_STUB_LISTENER_UDP; - m->read_resolv_conf = true; - m->need_builtin_fallbacks = true; - m->etc_hosts_last = m->etc_hosts_mtime = USEC_INFINITY; - - r = dns_trust_anchor_load(&m->trust_anchor); - if (r < 0) - return r; - - r = manager_parse_config_file(m); - if (r < 0) - return r; - - r = sd_event_default(&m->event); - if (r < 0) - return r; - - sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); - sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); - - sd_event_set_watchdog(m->event, true); - - r = manager_watch_hostname(m); - if (r < 0) - return r; - - r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC); - if (r < 0) - return r; - - r = manager_network_monitor_listen(m); - if (r < 0) - return r; - - r = manager_rtnl_listen(m); - if (r < 0) - return r; - - r = manager_connect_bus(m); - if (r < 0) - return r; - - (void) sd_event_add_signal(m->event, &m->sigusr1_event_source, SIGUSR1, manager_sigusr1, m); - (void) sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, manager_sigusr2, m); - - manager_cleanup_saved_user(m); - - *ret = m; - m = NULL; - - return 0; -} - -int manager_start(Manager *m) { - int r; - - assert(m); - - r = manager_dns_stub_start(m); - if (r < 0) - return r; - - r = manager_llmnr_start(m); - if (r < 0) - return r; - - r = manager_mdns_start(m); - if (r < 0) - return r; - - return 0; -} - -Manager *manager_free(Manager *m) { - Link *l; - - if (!m) - return NULL; - - dns_server_unlink_all(m->dns_servers); - dns_server_unlink_all(m->fallback_dns_servers); - dns_search_domain_unlink_all(m->search_domains); - - while ((l = hashmap_first(m->links))) - link_free(l); - - while (m->dns_queries) - dns_query_free(m->dns_queries); - - dns_scope_free(m->unicast_scope); - - /* 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); - - hashmap_free(m->links); - hashmap_free(m->dns_transactions); - - sd_event_source_unref(m->network_event_source); - sd_network_monitor_unref(m->network_monitor); - - sd_netlink_unref(m->rtnl); - sd_event_source_unref(m->rtnl_event_source); - - manager_llmnr_stop(m); - manager_mdns_stop(m); - manager_dns_stub_stop(m); - - sd_bus_slot_unref(m->prepare_for_sleep_slot); - sd_event_source_unref(m->bus_retry_event_source); - sd_bus_unref(m->bus); - - sd_event_source_unref(m->sigusr1_event_source); - sd_event_source_unref(m->sigusr2_event_source); - - sd_event_unref(m->event); - - dns_resource_key_unref(m->llmnr_host_ipv4_key); - dns_resource_key_unref(m->llmnr_host_ipv6_key); - - sd_event_source_unref(m->hostname_event_source); - safe_close(m->hostname_fd); - free(m->llmnr_hostname); - free(m->mdns_hostname); - - dns_trust_anchor_flush(&m->trust_anchor); - 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; - union { - struct cmsghdr header; /* For alignment */ - uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo)) - + CMSG_SPACE(int) /* ttl/hoplimit */ - + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */]; - } control; - union sockaddr_union sa; - struct msghdr mh = {}; - struct cmsghdr *cmsg; - struct iovec iov; - 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); - if (r < 0) - return r; - - iov.iov_base = DNS_PACKET_DATA(p); - iov.iov_len = p->allocated; - - mh.msg_name = &sa.sa; - mh.msg_namelen = sizeof(sa); - mh.msg_iov = &iov; - mh.msg_iovlen = 1; - mh.msg_control = &control; - mh.msg_controllen = sizeof(control); - - l = recvmsg(fd, &mh, 0); - if (l == 0) - return 0; - if (l < 0) { - if (errno == EAGAIN || errno == EINTR) - return 0; - - return -errno; - } - - assert(!(mh.msg_flags & MSG_CTRUNC)); - assert(!(mh.msg_flags & MSG_TRUNC)); - - p->size = (size_t) l; - - p->family = sa.sa.sa_family; - p->ipproto = IPPROTO_UDP; - if (p->family == AF_INET) { - p->sender.in = sa.in.sin_addr; - p->sender_port = be16toh(sa.in.sin_port); - } else if (p->family == AF_INET6) { - p->sender.in6 = sa.in6.sin6_addr; - p->sender_port = be16toh(sa.in6.sin6_port); - p->ifindex = sa.in6.sin6_scope_id; - } else - return -EAFNOSUPPORT; - - CMSG_FOREACH(cmsg, &mh) { - - if (cmsg->cmsg_level == IPPROTO_IPV6) { - assert(p->family == AF_INET6); - - switch (cmsg->cmsg_type) { - - case IPV6_PKTINFO: { - struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg); - - if (p->ifindex <= 0) - p->ifindex = i->ipi6_ifindex; - - p->destination.in6 = i->ipi6_addr; - break; - } - - case IPV6_HOPLIMIT: - p->ttl = *(int *) CMSG_DATA(cmsg); - break; - - } - } else if (cmsg->cmsg_level == IPPROTO_IP) { - assert(p->family == AF_INET); - - switch (cmsg->cmsg_type) { - - case IP_PKTINFO: { - struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg); - - if (p->ifindex <= 0) - p->ifindex = i->ipi_ifindex; - - p->destination.in = i->ipi_addr; - break; - } - - case IP_TTL: - p->ttl = *(int *) CMSG_DATA(cmsg); - break; - } - } - } - - /* The Linux kernel sets the interface index to the loopback - * device if the packet came from the local host since it - * avoids the routing table in such a case. Let's unset the - * interface index in such a case. */ - if (p->ifindex == LOOPBACK_IFINDEX) - p->ifindex = 0; - - if (protocol != DNS_PROTOCOL_DNS) { - /* If we don't know the interface index still, we look for the - * first local interface with a matching address. Yuck! */ - if (p->ifindex <= 0) - p->ifindex = manager_find_ifindex(m, p->family, &p->destination); - } - - *ret = p; - p = NULL; - - return 1; -} - -static int sendmsg_loop(int fd, struct msghdr *mh, int flags) { - int r; - - assert(fd >= 0); - assert(mh); - - for (;;) { - if (sendmsg(fd, mh, flags) >= 0) - return 0; - - if (errno == EINTR) - continue; - - if (errno != EAGAIN) - return -errno; - - r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); - if (r < 0) - return r; - if (r == 0) - return -ETIMEDOUT; - } -} - -static int write_loop(int fd, void *message, size_t length) { - int r; - - assert(fd >= 0); - assert(message); - - for (;;) { - if (write(fd, message, length) >= 0) - return 0; - - if (errno == EINTR) - continue; - - if (errno != EAGAIN) - return -errno; - - r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC); - if (r < 0) - return r; - if (r == 0) - return -ETIMEDOUT; - } -} - -int manager_write(Manager *m, int fd, DnsPacket *p) { - int r; - - log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p)); - - r = write_loop(fd, DNS_PACKET_DATA(p), p->size); - if (r < 0) - return r; - - return 0; -} - -static int manager_ipv4_send( - Manager *m, - int fd, - int ifindex, - const struct in_addr *destination, - uint16_t port, - const struct in_addr *source, - DnsPacket *p) { - union sockaddr_union sa = { - .in.sin_family = AF_INET, - }; - union { - struct cmsghdr header; /* For alignment */ - uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))]; - } control; - struct msghdr mh = {}; - struct iovec iov; - - assert(m); - assert(fd >= 0); - assert(destination); - assert(port > 0); - assert(p); - - iov.iov_base = DNS_PACKET_DATA(p); - iov.iov_len = p->size; - - sa.in.sin_addr = *destination; - sa.in.sin_port = htobe16(port), - - mh.msg_iov = &iov; - mh.msg_iovlen = 1; - mh.msg_name = &sa.sa; - mh.msg_namelen = sizeof(sa.in); - - if (ifindex > 0) { - struct cmsghdr *cmsg; - struct in_pktinfo *pi; - - zero(control); - - mh.msg_control = &control; - mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)); - - cmsg = CMSG_FIRSTHDR(&mh); - cmsg->cmsg_len = mh.msg_controllen; - cmsg->cmsg_level = IPPROTO_IP; - cmsg->cmsg_type = IP_PKTINFO; - - pi = (struct in_pktinfo*) CMSG_DATA(cmsg); - pi->ipi_ifindex = ifindex; - - 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) { - - union sockaddr_union sa = { - .in6.sin6_family = AF_INET6, - }; - union { - struct cmsghdr header; /* For alignment */ - uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))]; - } control; - struct msghdr mh = {}; - struct iovec iov; - - assert(m); - assert(fd >= 0); - assert(destination); - assert(port > 0); - assert(p); - - iov.iov_base = DNS_PACKET_DATA(p); - iov.iov_len = p->size; - - sa.in6.sin6_addr = *destination; - sa.in6.sin6_port = htobe16(port), - sa.in6.sin6_scope_id = ifindex; - - mh.msg_iov = &iov; - mh.msg_iovlen = 1; - mh.msg_name = &sa.sa; - mh.msg_namelen = sizeof(sa.in6); - - if (ifindex > 0) { - struct cmsghdr *cmsg; - struct in6_pktinfo *pi; - - zero(control); - - mh.msg_control = &control; - mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)); - - cmsg = CMSG_FIRSTHDR(&mh); - cmsg->cmsg_len = mh.msg_controllen; - cmsg->cmsg_level = IPPROTO_IPV6; - cmsg->cmsg_type = IPV6_PKTINFO; - - pi = (struct in6_pktinfo*) CMSG_DATA(cmsg); - pi->ipi6_ifindex = ifindex; - - 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->in, p); - if (family == AF_INET6) - return manager_ipv6_send(m, fd, ifindex, &destination->in6, port, &source->in6, p); - - return -EAFNOSUPPORT; -} - -uint32_t manager_find_mtu(Manager *m) { - uint32_t mtu = 0; - Link *l; - Iterator i; - - /* If we don't know on which link a DNS packet would be - * delivered, let's find the largest MTU that works on all - * interfaces we know of */ - - HASHMAP_FOREACH(l, m->links, i) { - if (l->mtu <= 0) - continue; - - if (mtu <= 0 || l->mtu < mtu) - mtu = l->mtu; - } - - return mtu; -} - -int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) { - LinkAddress *a; - - assert(m); - - a = manager_find_link_address(m, family, in_addr); - if (a) - return a->link->ifindex; - - return 0; -} - -void manager_refresh_rrs(Manager *m) { - Iterator i; - Link *l; - - assert(m); - - m->llmnr_host_ipv4_key = dns_resource_key_unref(m->llmnr_host_ipv4_key); - m->llmnr_host_ipv6_key = dns_resource_key_unref(m->llmnr_host_ipv6_key); - - HASHMAP_FOREACH(l, m->links, i) { - link_add_rrs(l, true); - link_add_rrs(l, false); - } -} - -int manager_next_hostname(Manager *m) { - const char *p; - uint64_t u, a; - char *h, *k; - int r; - - assert(m); - - p = strchr(m->llmnr_hostname, 0); - assert(p); - - while (p > m->llmnr_hostname) { - if (!strchr("0123456789", p[-1])) - break; - - p--; - } - - if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0) - u = 1; - - /* Add a random number to the old value. This way we can avoid - * that two hosts pick the same hostname, win on IPv4 and lose - * on IPv6 (or vice versa), and pick the same hostname - * replacement hostname, ad infinitum. We still want the - * numbers to go up monotonically, hence we just add a random - * value 1..10 */ - - random_bytes(&a, sizeof(a)); - u += 1 + a % 10; - - if (asprintf(&h, "%.*s%" PRIu64, (int) (p - m->llmnr_hostname), m->llmnr_hostname, u) < 0) - return -ENOMEM; - - r = dns_name_concat(h, "local", &k); - if (r < 0) { - free(h); - return r; - } - - log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h); - - free(m->llmnr_hostname); - m->llmnr_hostname = h; - - free(m->mdns_hostname); - m->mdns_hostname = k; - - manager_refresh_rrs(m); - - return 0; -} - -LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) { - Iterator i; - Link *l; - - assert(m); - - HASHMAP_FOREACH(l, m->links, i) { - LinkAddress *a; - - a = link_find_address(l, family, in_addr); - if (a) - return a; - } - - return NULL; -} - -bool manager_our_packet(Manager *m, DnsPacket *p) { - assert(m); - assert(p); - - return !!manager_find_link_address(m, p->family, &p->sender); -} - -DnsScope* manager_find_scope(Manager *m, DnsPacket *p) { - Link *l; - - assert(m); - assert(p); - - l = hashmap_get(m->links, INT_TO_PTR(p->ifindex)); - if (!l) - return NULL; - - switch (p->protocol) { - case DNS_PROTOCOL_LLMNR: - if (p->family == AF_INET) - return l->llmnr_ipv4_scope; - else if (p->family == AF_INET6) - return l->llmnr_ipv6_scope; - - break; - - case DNS_PROTOCOL_MDNS: - if (p->family == AF_INET) - return l->mdns_ipv4_scope; - else if (p->family == AF_INET6) - return l->mdns_ipv6_scope; - - break; - - default: - break; - } - - return NULL; -} - -void manager_verify_all(Manager *m) { - DnsScope *s; - - assert(m); - - LIST_FOREACH(scopes, s, m->dns_scopes) - dns_zone_verify_all(&s->zone); -} - -int manager_is_own_hostname(Manager *m, const char *name) { - int r; - - assert(m); - assert(name); - - if (m->llmnr_hostname) { - r = dns_name_equal(name, m->llmnr_hostname); - if (r != 0) - return r; - } - - if (m->mdns_hostname) - return dns_name_equal(name, m->mdns_hostname); - - return 0; -} - -int manager_compile_dns_servers(Manager *m, OrderedSet **dns) { - DnsServer *s; - Iterator i; - Link *l; - int r; - - assert(m); - assert(dns); - - r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops); - if (r < 0) - return r; - - /* First add the system-wide servers and domains */ - LIST_FOREACH(servers, s, m->dns_servers) { - r = ordered_set_put(*dns, s); - if (r == -EEXIST) - continue; - if (r < 0) - return r; - } - - /* Then, add the per-link servers */ - HASHMAP_FOREACH(l, m->links, i) { - LIST_FOREACH(servers, s, l->dns_servers) { - r = ordered_set_put(*dns, s); - if (r == -EEXIST) - continue; - if (r < 0) - return r; - } - } - - /* If we found nothing, add the fallback servers */ - if (ordered_set_isempty(*dns)) { - LIST_FOREACH(servers, s, m->fallback_dns_servers) { - r = ordered_set_put(*dns, s); - if (r == -EEXIST) - continue; - if (r < 0) - return r; - } - } - - return 0; -} - -/* 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; -} - -void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key) { - - assert(verdict >= 0); - assert(verdict < _DNSSEC_VERDICT_MAX); - - if (log_get_max_level() >= LOG_DEBUG) { - 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_cleanup_saved_user(Manager *m) { - _cleanup_closedir_ DIR *d = NULL; - struct dirent *de; - int r; - - 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 (STR_IN_SET(de->d_name, ".", "..")) - continue; - - r = parse_ifindex(de->d_name, &ifindex); - if (r < 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 = strappend("/run/systemd/resolve/netif/", de->d_name); - if (!p) { - log_oom(); - return; - } - - (void) unlink(p); - } -} |