diff options
Diffstat (limited to 'src/resolve/resolved-manager.c')
-rw-r--r-- | src/resolve/resolved-manager.c | 1841 |
1 files changed, 0 insertions, 1841 deletions
diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c deleted file mode 100644 index 167bea39b3..0000000000 --- a/src/resolve/resolved-manager.c +++ /dev/null @@ -1,1841 +0,0 @@ -/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ - -/*** - 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 <resolv.h> -#include <sys/ioctl.h> -#include <poll.h> -#include <netinet/in.h> - -#include "rtnl-util.h" -#include "network-internal.h" -#include "socket-util.h" -#include "af-list.h" -#include "utf8.h" -#include "fileio-label.h" - -#include "resolved-dns-domain.h" -#include "resolved-conf.h" -#include "resolved-bus.h" -#include "resolved-manager.h" - -#define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC) - -static int manager_process_link(sd_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) { - Manager *m = userdata; - uint16_t type; - Link *l; - int ifindex, r; - - assert(rtnl); - assert(m); - assert(mm); - - r = sd_rtnl_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_update_rtnl(l, mm); - if (r < 0) - goto fail; - - r = link_update_monitor(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_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_rtnl *rtnl, sd_rtnl_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_rtnl_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_rtnl_message_read_in_addr(mm, IFA_LOCAL, &address.in); - if (r < 0) { - r = sd_rtnl_message_read_in_addr(mm, IFA_ADDRESS, &address.in); - if (r < 0) - goto fail; - } - - break; - - case AF_INET6: - r = sd_rtnl_message_read_in6_addr(mm, IFA_LOCAL, &address.in6); - if (r < 0) { - r = sd_rtnl_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: - if (a) - 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_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL; - sd_rtnl_message *i; - int r; - - assert(m); - - /* First, subscribe to interfaces coming and going */ - r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR); - if (r < 0) - return r; - - r = sd_rtnl_attach_event(m->rtnl, m->event, 0); - if (r < 0) - return r; - - r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m); - if (r < 0) - return r; - - r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m); - if (r < 0) - return r; - - r = sd_rtnl_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m); - if (r < 0) - return r; - - r = sd_rtnl_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_rtnl_message_request_dump(req, true); - if (r < 0) - return r; - - r = sd_rtnl_call(m->rtnl, req, 0, &reply); - if (r < 0) - return r; - - for (i = reply; i; i = sd_rtnl_message_next(i)) { - r = manager_process_link(m->rtnl, i, m); - if (r < 0) - return r; - } - - req = sd_rtnl_message_unref(req); - reply = sd_rtnl_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_rtnl_message_request_dump(req, true); - if (r < 0) - return r; - - r = sd_rtnl_call(m->rtnl, req, 0, &reply); - if (r < 0) - return r; - - for (i = reply; i; i = sd_rtnl_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_monitor(l); - if (r < 0) - log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex); - } - - r = manager_write_resolv_conf(m); - if (r < 0) - log_warning_errno(r, "Could not update 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; - - return 0; -} - -static int determine_hostname(char **ret) { - _cleanup_free_ char *h = NULL, *n = NULL; - int r; - - assert(ret); - - h = gethostname_malloc(); - if (!h) - return log_oom(); - - if (!utf8_is_valid(h)) { - log_error("System hostname is not UTF-8 clean."); - return -EINVAL; - } - - r = dns_name_normalize(h, &n); - if (r < 0) { - log_error("System hostname '%s' cannot be normalized.", h); - return r; - } - - *ret = n; - n = NULL; - - return 0; -} - -static int on_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) { - _cleanup_free_ char *h = NULL; - Manager *m = userdata; - int r; - - assert(m); - - r = determine_hostname(&h); - if (r < 0) - return 0; /* ignore invalid hostnames */ - - if (streq(h, m->hostname)) - return 0; - - log_info("System hostname changed to '%s'.", h); - free(m->hostname); - m->hostname = h; - h = 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"); - } - - r = determine_hostname(&m->hostname); - if (r < 0) { - log_info("Defaulting to hostname 'linux'."); - m->hostname = strdup("linux"); - if (!m->hostname) - return log_oom(); - } else - log_info("Using system hostname '%s'.", m->hostname); - - 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; - - assert(ret); - - m = new0(Manager, 1); - if (!m) - return -ENOMEM; - - m->dns_ipv4_fd = m->dns_ipv6_fd = -1; - m->llmnr_ipv4_udp_fd = m->llmnr_ipv6_udp_fd = -1; - m->llmnr_ipv4_tcp_fd = m->llmnr_ipv6_tcp_fd = -1; - m->hostname_fd = -1; - - m->llmnr_support = SUPPORT_YES; - m->read_resolv_conf = true; - - r = manager_parse_dns_server(m, DNS_SERVER_FALLBACK, DNS_SERVERS); - 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; - - *ret = m; - m = NULL; - - return 0; -} - -int manager_start(Manager *m) { - int r; - - assert(m); - - r = manager_llmnr_start(m); - if (r < 0) - return r; - - return 0; -} - -Manager *manager_free(Manager *m) { - Link *l; - - if (!m) - return NULL; - - 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); - - manager_flush_dns_servers(m, DNS_SERVER_SYSTEM); - manager_flush_dns_servers(m, DNS_SERVER_FALLBACK); - - 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_event_source_unref(m->dns_ipv4_event_source); - sd_event_source_unref(m->dns_ipv6_event_source); - safe_close(m->dns_ipv4_fd); - safe_close(m->dns_ipv6_fd); - - manager_llmnr_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_unref(m->event); - - dns_resource_key_unref(m->host_ipv4_key); - dns_resource_key_unref(m->host_ipv6_key); - - safe_close(m->hostname_fd); - sd_event_source_unref(m->hostname_event_source); - free(m->hostname); - - free(m); - - return NULL; -} - -int manager_read_resolv_conf(Manager *m) { - _cleanup_fclose_ FILE *f = NULL; - struct stat st, own; - char line[LINE_MAX]; - DnsServer *s, *nx; - usec_t t; - int r; - - assert(m); - - /* Reads the system /etc/resolv.conf, if it exists and is not - * symlinked to our own resolv.conf instance */ - - if (!m->read_resolv_conf) - return 0; - - r = stat("/etc/resolv.conf", &st); - if (r < 0) { - if (errno != ENOENT) - log_warning_errno(errno, "Failed to open /etc/resolv.conf: %m"); - r = -errno; - goto clear; - } - - /* Have we already seen the file? */ - t = timespec_load(&st.st_mtim); - if (t == m->resolv_conf_mtime) - return 0; - - m->resolv_conf_mtime = t; - - /* Is it symlinked to our own file? */ - if (stat("/run/systemd/resolve/resolv.conf", &own) >= 0 && - st.st_dev == own.st_dev && - st.st_ino == own.st_ino) { - r = 0; - goto clear; - } - - f = fopen("/etc/resolv.conf", "re"); - if (!f) { - if (errno != ENOENT) - log_warning_errno(errno, "Failed to open /etc/resolv.conf: %m"); - r = -errno; - goto clear; - } - - if (fstat(fileno(f), &st) < 0) { - log_error_errno(errno, "Failed to stat open file: %m"); - r = -errno; - goto clear; - } - - LIST_FOREACH(servers, s, m->dns_servers) - s->marked = true; - - FOREACH_LINE(line, f, r = -errno; goto clear) { - union in_addr_union address; - int family; - char *l; - const char *a; - - truncate_nl(line); - - l = strstrip(line); - if (*l == '#' || *l == ';') - continue; - - a = first_word(l, "nameserver"); - if (!a) - continue; - - r = in_addr_from_string_auto(a, &family, &address); - if (r < 0) { - log_warning("Failed to parse name server %s.", a); - continue; - } - - LIST_FOREACH(servers, s, m->dns_servers) - if (s->family == family && in_addr_equal(family, &s->address, &address) > 0) - break; - - if (s) - s->marked = false; - else { - r = dns_server_new(m, NULL, DNS_SERVER_SYSTEM, NULL, family, &address); - if (r < 0) - goto clear; - } - } - - LIST_FOREACH_SAFE(servers, s, nx, m->dns_servers) - if (s->marked) - dns_server_free(s); - - /* Whenever /etc/resolv.conf changes, start using the first - * DNS server of it. This is useful to deal with broken - * network managing implementations (like NetworkManager), - * that when connecting to a VPN place both the VPN DNS - * servers and the local ones in /etc/resolv.conf. Without - * resetting the DNS server to use back to the first entry we - * will continue to use the local one thus being unable to - * resolve VPN domains. */ - manager_set_dns_server(m, m->dns_servers); - - return 0; - -clear: - while (m->dns_servers) - dns_server_free(m->dns_servers); - - return r; -} - -static void write_resolv_conf_server(DnsServer *s, FILE *f, unsigned *count) { - _cleanup_free_ char *t = NULL; - int r; - - assert(s); - assert(f); - assert(count); - - r = in_addr_to_string(s->family, &s->address, &t); - if (r < 0) { - log_warning_errno(r, "Invalid DNS address. Ignoring: %m"); - return; - } - - if (*count == MAXNS) - fputs("# Too many DNS servers configured, the following entries may be ignored.\n", f); - - fprintf(f, "nameserver %s\n", t); - (*count) ++; -} - -static void write_resolv_conf_search(const char *domain, FILE *f, - unsigned *count, unsigned *length) { - assert(domain); - assert(f); - assert(length); - - if (*count >= MAXDNSRCH || - *length + strlen(domain) > 256) { - if (*count == MAXDNSRCH) - fputs(" # Too many search domains configured, remaining ones ignored.", f); - if (*length <= 256) - fputs(" # Total length of all search domains is too long, remaining ones ignored.", f); - - return; - } - - fprintf(f, " %s", domain); - - (*length) += strlen(domain); - (*count) ++; -} - -static int write_resolv_conf_contents(FILE *f, Set *dns, Set *domains) { - Iterator i; - - fputs("# This file is managed by systemd-resolved(8). Do not edit.\n#\n" - "# Third party programs must not access this file directly, but\n" - "# only through the symlink at /etc/resolv.conf. To manage\n" - "# resolv.conf(5) in a different way, replace the symlink by a\n" - "# static file or a different symlink.\n\n", f); - - if (set_isempty(dns)) - fputs("# No DNS servers known.\n", f); - else { - DnsServer *s; - unsigned count = 0; - - SET_FOREACH(s, dns, i) - write_resolv_conf_server(s, f, &count); - } - - if (!set_isempty(domains)) { - unsigned length = 0, count = 0; - char *domain; - - fputs("search", f); - SET_FOREACH(domain, domains, i) - write_resolv_conf_search(domain, f, &count, &length); - fputs("\n", f); - } - - return fflush_and_check(f); -} - - -int manager_write_resolv_conf(Manager *m) { - static const char path[] = "/run/systemd/resolve/resolv.conf"; - _cleanup_free_ char *temp_path = NULL; - _cleanup_fclose_ FILE *f = NULL; - _cleanup_set_free_ Set *dns = NULL, *domains = NULL; - DnsServer *s; - Iterator i; - Link *l; - int r; - - assert(m); - - /* Read the system /etc/resolv.conf first */ - manager_read_resolv_conf(m); - - /* Add the full list to a set, to filter out duplicates */ - dns = set_new(&dns_server_hash_ops); - if (!dns) - return -ENOMEM; - - domains = set_new(&dns_name_hash_ops); - if (!domains) - return -ENOMEM; - - /* First add the system-wide servers */ - LIST_FOREACH(servers, s, m->dns_servers) { - r = set_put(dns, s); - if (r == -EEXIST) - continue; - if (r < 0) - return r; - } - - /* Then, add the per-link servers and domains */ - HASHMAP_FOREACH(l, m->links, i) { - char **domain; - - LIST_FOREACH(servers, s, l->dns_servers) { - r = set_put(dns, s); - if (r == -EEXIST) - continue; - if (r < 0) - return r; - } - - if (!l->unicast_scope) - continue; - - STRV_FOREACH(domain, l->unicast_scope->domains) { - r = set_put(domains, *domain); - if (r == -EEXIST) - continue; - if (r < 0) - return r; - } - } - - /* If we found nothing, add the fallback servers */ - if (set_isempty(dns)) { - LIST_FOREACH(servers, s, m->fallback_dns_servers) { - r = set_put(dns, s); - if (r == -EEXIST) - continue; - if (r < 0) - return r; - } - } - - r = fopen_temporary_label(path, path, &f, &temp_path); - if (r < 0) - return r; - - fchmod(fileno(f), 0644); - - r = write_resolv_conf_contents(f, dns, domains); - if (r < 0) - goto fail; - - if (rename(temp_path, path) < 0) { - r = -errno; - goto fail; - } - - return 0; - -fail: - unlink(path); - unlink(temp_path); - return r; -} - -int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) { - _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; - union { - struct cmsghdr header; /* For alignment */ - uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo)) - + CMSG_SPACE(int) /* ttl/hoplimit */ - + EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */]; - } control; - union sockaddr_union sa; - struct msghdr mh = {}; - struct cmsghdr *cmsg; - struct iovec iov; - int ms = 0, r; - ssize_t l; - - assert(m); - assert(fd >= 0); - assert(ret); - - r = ioctl(fd, FIONREAD, &ms); - if (r < 0) - return -errno; - if (ms < 0) - return -EIO; - - r = dns_packet_new(&p, protocol, ms); - if (r < 0) - return r; - - iov.iov_base = DNS_PACKET_DATA(p); - iov.iov_len = p->allocated; - - mh.msg_name = &sa.sa; - mh.msg_namelen = sizeof(sa); - mh.msg_iov = &iov; - mh.msg_iovlen = 1; - mh.msg_control = &control; - mh.msg_controllen = sizeof(control); - - l = recvmsg(fd, &mh, 0); - if (l < 0) { - if (errno == EAGAIN || errno == EINTR) - return 0; - - return -errno; - } - - if (l <= 0) - return -EIO; - - assert(!(mh.msg_flags & MSG_CTRUNC)); - assert(!(mh.msg_flags & MSG_TRUNC)); - - p->size = (size_t) l; - - p->family = sa.sa.sa_family; - p->ipproto = IPPROTO_UDP; - if (p->family == AF_INET) { - p->sender.in = sa.in.sin_addr; - p->sender_port = be16toh(sa.in.sin_port); - } else if (p->family == AF_INET6) { - p->sender.in6 = sa.in6.sin6_addr; - p->sender_port = be16toh(sa.in6.sin6_port); - p->ifindex = sa.in6.sin6_scope_id; - } else - return -EAFNOSUPPORT; - - for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg)) { - - 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 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 on_dns_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; - int r; - - r = manager_recv(m, fd, DNS_PROTOCOL_DNS, &p); - if (r <= 0) - return r; - - if (dns_packet_validate_reply(p) > 0) { - t = hashmap_get(m->dns_transactions, UINT_TO_PTR(DNS_PACKET_ID(p))); - if (!t) - return 0; - - dns_transaction_process_reply(t, p); - - } else - log_debug("Invalid DNS packet."); - - return 0; -} - -int manager_dns_ipv4_fd(Manager *m) { - const int one = 1; - int r; - - assert(m); - - if (m->dns_ipv4_fd >= 0) - return m->dns_ipv4_fd; - - m->dns_ipv4_fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); - if (m->dns_ipv4_fd < 0) - return -errno; - - r = setsockopt(m->dns_ipv4_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one)); - if (r < 0) { - r = -errno; - goto fail; - } - - r = sd_event_add_io(m->event, &m->dns_ipv4_event_source, m->dns_ipv4_fd, EPOLLIN, on_dns_packet, m); - if (r < 0) - goto fail; - - return m->dns_ipv4_fd; - -fail: - m->dns_ipv4_fd = safe_close(m->dns_ipv4_fd); - return r; -} - -int manager_dns_ipv6_fd(Manager *m) { - const int one = 1; - int r; - - assert(m); - - if (m->dns_ipv6_fd >= 0) - return m->dns_ipv6_fd; - - m->dns_ipv6_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); - if (m->dns_ipv6_fd < 0) - return -errno; - - r = setsockopt(m->dns_ipv6_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one)); - if (r < 0) { - r = -errno; - goto fail; - } - - r = sd_event_add_io(m->event, &m->dns_ipv6_event_source, m->dns_ipv6_fd, EPOLLIN, on_dns_packet, m); - if (r < 0) - goto fail; - - return m->dns_ipv6_fd; - -fail: - m->dns_ipv6_fd = safe_close(m->dns_ipv6_fd); - return r; -} - -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 manager_ipv4_send(Manager *m, int fd, int ifindex, const struct in_addr *addr, uint16_t port, DnsPacket *p) { - union sockaddr_union sa = { - .in.sin_family = AF_INET, - }; - union { - struct cmsghdr header; /* For alignment */ - uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))]; - } control; - struct msghdr mh = {}; - struct iovec iov; - - assert(m); - assert(fd >= 0); - assert(addr); - assert(port > 0); - assert(p); - - iov.iov_base = DNS_PACKET_DATA(p); - iov.iov_len = p->size; - - sa.in.sin_addr = *addr; - sa.in.sin_port = htobe16(port), - - mh.msg_iov = &iov; - mh.msg_iovlen = 1; - mh.msg_name = &sa.sa; - mh.msg_namelen = sizeof(sa.in); - - if (ifindex > 0) { - struct cmsghdr *cmsg; - struct in_pktinfo *pi; - - zero(control); - - mh.msg_control = &control; - mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)); - - cmsg = CMSG_FIRSTHDR(&mh); - cmsg->cmsg_len = mh.msg_controllen; - cmsg->cmsg_level = IPPROTO_IP; - cmsg->cmsg_type = IP_PKTINFO; - - pi = (struct in_pktinfo*) CMSG_DATA(cmsg); - pi->ipi_ifindex = ifindex; - } - - return sendmsg_loop(fd, &mh, 0); -} - -static int manager_ipv6_send(Manager *m, int fd, int ifindex, const struct in6_addr *addr, uint16_t port, DnsPacket *p) { - union sockaddr_union sa = { - .in6.sin6_family = AF_INET6, - }; - union { - struct cmsghdr header; /* For alignment */ - uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))]; - } control; - struct msghdr mh = {}; - struct iovec iov; - - assert(m); - assert(fd >= 0); - assert(addr); - assert(port > 0); - assert(p); - - iov.iov_base = DNS_PACKET_DATA(p); - iov.iov_len = p->size; - - sa.in6.sin6_addr = *addr; - sa.in6.sin6_port = htobe16(port), - sa.in6.sin6_scope_id = ifindex; - - mh.msg_iov = &iov; - mh.msg_iovlen = 1; - mh.msg_name = &sa.sa; - mh.msg_namelen = sizeof(sa.in6); - - if (ifindex > 0) { - struct cmsghdr *cmsg; - struct in6_pktinfo *pi; - - zero(control); - - mh.msg_control = &control; - mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)); - - cmsg = CMSG_FIRSTHDR(&mh); - cmsg->cmsg_len = mh.msg_controllen; - cmsg->cmsg_level = IPPROTO_IPV6; - cmsg->cmsg_type = IPV6_PKTINFO; - - pi = (struct in6_pktinfo*) CMSG_DATA(cmsg); - pi->ipi6_ifindex = ifindex; - } - - return sendmsg_loop(fd, &mh, 0); -} - -int manager_send(Manager *m, int fd, int ifindex, int family, const union in_addr_union *addr, uint16_t port, DnsPacket *p) { - assert(m); - assert(fd >= 0); - assert(addr); - assert(port > 0); - assert(p); - - log_debug("Sending %s packet with id %u on interface %i/%s", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p), ifindex, af_to_name(family)); - - if (family == AF_INET) - return manager_ipv4_send(m, fd, ifindex, &addr->in, port, p); - else if (family == AF_INET6) - return manager_ipv6_send(m, fd, ifindex, &addr->in6, port, p); - - return -EAFNOSUPPORT; -} - -DnsServer* manager_find_dns_server(Manager *m, int family, const union in_addr_union *in_addr) { - DnsServer *s; - - assert(m); - assert(in_addr); - - LIST_FOREACH(servers, s, m->dns_servers) - if (s->family == family && in_addr_equal(family, &s->address, in_addr) > 0) - return s; - - LIST_FOREACH(servers, s, m->fallback_dns_servers) - if (s->family == family && in_addr_equal(family, &s->address, in_addr) > 0) - return s; - - return NULL; -} - -DnsServer *manager_set_dns_server(Manager *m, DnsServer *s) { - assert(m); - - if (m->current_dns_server == s) - return s; - - if (s) { - _cleanup_free_ char *ip = NULL; - - in_addr_to_string(s->family, &s->address, &ip); - log_info("Switching to system DNS server %s.", strna(ip)); - } - - m->current_dns_server = s; - - if (m->unicast_scope) - dns_cache_flush(&m->unicast_scope->cache); - - return s; -} - -DnsServer *manager_get_dns_server(Manager *m) { - Link *l; - assert(m); - - /* Try to read updates resolv.conf */ - manager_read_resolv_conf(m); - - if (!m->current_dns_server) - manager_set_dns_server(m, m->dns_servers); - - if (!m->current_dns_server) { - bool found = false; - Iterator i; - - /* No DNS servers configured, let's see if there are - * any on any links. If not, we use the fallback - * servers */ - - HASHMAP_FOREACH(l, m->links, i) - if (l->dns_servers) { - found = true; - break; - } - - if (!found) - manager_set_dns_server(m, m->fallback_dns_servers); - } - - return m->current_dns_server; -} - -void manager_next_dns_server(Manager *m) { - assert(m); - - /* If there's currently no DNS server set, then the next - * manager_get_dns_server() will find one */ - if (!m->current_dns_server) - return; - - /* Change to the next one */ - if (m->current_dns_server->servers_next) { - manager_set_dns_server(m, m->current_dns_server->servers_next); - return; - } - - /* If there was no next one, then start from the beginning of - * the list */ - if (m->current_dns_server->type == DNS_SERVER_FALLBACK) - manager_set_dns_server(m, m->fallback_dns_servers); - else - manager_set_dns_server(m, m->dns_servers); -} - -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; -} - -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; - - 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->host_ipv4_key = dns_resource_key_unref(m->host_ipv4_key); - m->host_ipv6_key = dns_resource_key_unref(m->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; - - assert(m); - - p = strchr(m->hostname, 0); - assert(p); - - while (p > m->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->hostname), m->hostname, u) < 0) - return -ENOMEM; - - log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->hostname, h); - - free(m->hostname); - m->hostname = h; - - 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; - - if (p->protocol == DNS_PROTOCOL_LLMNR) { - if (p->family == AF_INET) - return l->llmnr_ipv4_scope; - else if (p->family == AF_INET6) - return l->llmnr_ipv6_scope; - } - - 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); -} - -void manager_flush_dns_servers(Manager *m, DnsServerType t) { - assert(m); - - if (t == DNS_SERVER_SYSTEM) - while (m->dns_servers) - dns_server_free(m->dns_servers); - - if (t == DNS_SERVER_FALLBACK) - while (m->fallback_dns_servers) - dns_server_free(m->fallback_dns_servers); -} - -static const char* const support_table[_SUPPORT_MAX] = { - [SUPPORT_NO] = "no", - [SUPPORT_YES] = "yes", - [SUPPORT_RESOLVE] = "resolve", -}; -DEFINE_STRING_TABLE_LOOKUP(support, Support); |