3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog#include <netinet/in.h>

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering#include <poll.h>

4871690d9e32608bbd9b18505b5326c2079c9690Allin Cottrell#include <sys/ioctl.h>

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering

6bedfcbb2970e06a4d3280c8fb62083d252ede73Lennart Poettering#include "af-list.h"

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog#include "alloc-util.h"

6482f6269c87d2249e52e889a63adbdd50f2d691Ronny Chevalier#include "dns-domain.h"

afc5dbf37fd2399d37976388d9dd9ab470ecf446Lennart Poettering#include "fd-util.h"

6bedfcbb2970e06a4d3280c8fb62083d252ede73Lennart Poettering#include "fileio-label.h"

6bedfcbb2970e06a4d3280c8fb62083d252ede73Lennart Poettering#include "hostname-util.h"

6bedfcbb2970e06a4d3280c8fb62083d252ede73Lennart Poettering#include "io-util.h"

0b452006de98294d1690f045f6ea2f7f6630ec3bRonny Chevalier#include "netlink-util.h"

15a5e95075a7f6007dd97b2a165c8ed16fe683dfLennart Poettering#include "network-internal.h"

288a74cce597f81d3ba01d8a5ca7d2ba5b654b7eRonny Chevalier#include "ordered-set.h"

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering#include "parse-util.h"

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog#include "random-util.h"

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog#include "resolved-bus.h"

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog#include "resolved-conf.h"

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog#include "resolved-llmnr.h"

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog#include "resolved-manager.h"

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog#include "resolved-resolv-conf.h"

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog#include "resolved-mdns.h"

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog#include "socket-util.h"

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog#include "string-table.h"

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog#include "string-util.h"

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog#include "utf8.h"

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog#define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskogstatic int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering Manager *m = userdata;

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering uint16_t type;

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering Link *l;

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering int ifindex, r;

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering

3b3154df7e2773332bb814e167187367a0ccae4aLennart Poettering assert(rtnl);

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering assert(m);

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog assert(mm);

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog

5ffa8c818120e35c89becd938d160235c069dd12Zbigniew Jędrzejewski-Szmek r = sd_netlink_message_get_type(mm, &type);

5ffa8c818120e35c89becd938d160235c069dd12Zbigniew Jędrzejewski-Szmek if (r < 0)

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering goto fail;

fb4729006a7174472e8a435b0887e532cd6217fcZbigniew Jędrzejewski-Szmek

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering if (r < 0)

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering goto fail;

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering l = hashmap_get(m->links, INT_TO_PTR(ifindex));

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering switch (type) {

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog case RTM_NEWLINK:{

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog bool is_new = !l;

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog

5ffa8c818120e35c89becd938d160235c069dd12Zbigniew Jędrzejewski-Szmek if (!l) {

de0671ee7fe465e108f62dcbbbe9366f81dd9e9aZbigniew Jędrzejewski-Szmek r = link_new(m, &l, ifindex);

de0671ee7fe465e108f62dcbbbe9366f81dd9e9aZbigniew Jędrzejewski-Szmek if (r < 0)

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog goto fail;

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog }

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog r = link_update_rtnl(l, mm);

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering if (r < 0)

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering goto fail;

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering r = link_update_monitor(l);

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering if (r < 0)

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering goto fail;

5ffa8c818120e35c89becd938d160235c069dd12Zbigniew Jędrzejewski-Szmek

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering if (is_new)

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering log_debug("Found new link %i/%s", ifindex, l->name);

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering break;

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering }

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering case RTM_DELLINK:

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering if (l) {

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering log_debug("Removing link %i/%s", l->ifindex, l->name);

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering link_free(l);

ad79565d6b37bcc93cf773a39b975e5b85d122daUmut Tezduyar Lindskog }

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering break;

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering }

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering return 0;

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poetteringfail:

56f64d95763a799ba4475daf44d8e9f72a1bd474Michal Schmidt log_warning_errno(r, "Failed to process RTNL link message: %m");

fb4729006a7174472e8a435b0887e532cd6217fcZbigniew Jędrzejewski-Szmek return 0;

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering}

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poetteringstatic int manager_process_address(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {

56f64d95763a799ba4475daf44d8e9f72a1bd474Michal Schmidt Manager *m = userdata;

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering union in_addr_union address;

03e334a1c7dc8c20c38902aa039440763acc9b17Lennart Poettering uint16_t type;

3b7124a8db56ed57525b9ecfd19cfdc8c9facba0Lennart Poettering 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, 0);

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_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 **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

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");

}

r = determine_hostname(&m->llmnr_hostname, &m->mdns_hostname);

if (r < 0) {

log_info("Defaulting to hostname 'linux'.");

m->llmnr_hostname = strdup("linux");

if (!m->llmnr_hostname)

return log_oom();

m->mdns_hostname = strdup("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;

}

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->hostname_fd = -1;

m->llmnr_support = SUPPORT_YES;

m->read_resolv_conf = true;

m->need_builtin_fallbacks = true;

r = dns_trust_anchor_load(&m->trust_anchor);

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);

*ret = m;

m = NULL;

return 0;

}

int manager_start(Manager *m) {

int r;

assert(m);

r = manager_llmnr_start(m);

if (r < 0)

return r;

r = manager_mdns_start(m);

if (r < 0)

return r;

return 0;

}

Manager *manager_free(Manager *m) {

Link *l;

if (!m)

return NULL;

dns_server_unlink_all(m->dns_servers);

dns_server_unlink_all(m->fallback_dns_servers);

dns_search_domain_unlink_all(m->search_domains);

while ((l = hashmap_first(m->links)))

link_free(l);

while (m->dns_queries)

dns_query_free(m->dns_queries);

dns_scope_free(m->unicast_scope);

hashmap_free(m->links);

hashmap_free(m->dns_transactions);

sd_event_source_unref(m->network_event_source);

sd_network_monitor_unref(m->network_monitor);

sd_netlink_unref(m->rtnl);

sd_event_source_unref(m->rtnl_event_source);

manager_llmnr_stop(m);

manager_mdns_stop(m);

sd_bus_slot_unref(m->prepare_for_sleep_slot);

sd_event_source_unref(m->bus_retry_event_source);

sd_bus_unref(m->bus);

sd_event_source_unref(m->sigusr1_event_source);

sd_event_unref(m->event);

dns_resource_key_unref(m->llmnr_host_ipv4_key);

dns_resource_key_unref(m->llmnr_host_ipv6_key);

sd_event_source_unref(m->hostname_event_source);

safe_close(m->hostname_fd);

free(m->llmnr_hostname);

free(m->mdns_hostname);

dns_trust_anchor_flush(&m->trust_anchor);

free(m);

return NULL;

}

int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {

_cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;

union {

struct cmsghdr header; /* For alignment */

uint8_t buffer[CMSG_SPACE(MAXSIZE(struct in_pktinfo, struct in6_pktinfo))

+ CMSG_SPACE(int) /* ttl/hoplimit */

+ EXTRA_CMSG_SPACE /* kernel appears to require extra buffer space */];

} control;

union sockaddr_union sa;

struct msghdr mh = {};

struct cmsghdr *cmsg;

struct iovec iov;

int ms = 0, r;

ssize_t l;

assert(m);

assert(fd >= 0);

assert(ret);

r = ioctl(fd, FIONREAD, &ms);

if (r < 0)

return -errno;

if (ms < 0)

return -EIO;

r = dns_packet_new(&p, protocol, ms);

if (r < 0)

return r;

iov.iov_base = DNS_PACKET_DATA(p);

iov.iov_len = p->allocated;

mh.msg_name = &sa.sa;

mh.msg_namelen = sizeof(sa);

mh.msg_iov = &iov;

mh.msg_iovlen = 1;

mh.msg_control = &control;

mh.msg_controllen = sizeof(control);

l = recvmsg(fd, &mh, 0);

if (l < 0) {

if (errno == EAGAIN || errno == EINTR)

return 0;

return -errno;

}

if (l <= 0)

return -EIO;

assert(!(mh.msg_flags & MSG_CTRUNC));

assert(!(mh.msg_flags & MSG_TRUNC));

p->size = (size_t) l;

p->family = sa.sa.sa_family;

p->ipproto = IPPROTO_UDP;

if (p->family == AF_INET) {

p->sender.in = sa.in.sin_addr;

p->sender_port = be16toh(sa.in.sin_port);

} else if (p->family == AF_INET6) {

p->sender.in6 = sa.in6.sin6_addr;

p->sender_port = be16toh(sa.in6.sin6_port);

p->ifindex = sa.in6.sin6_scope_id;

} else

return -EAFNOSUPPORT;

CMSG_FOREACH(cmsg, &mh) {

if (cmsg->cmsg_level == IPPROTO_IPV6) {

assert(p->family == AF_INET6);

switch (cmsg->cmsg_type) {

case IPV6_PKTINFO: {

struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);

if (p->ifindex <= 0)

p->ifindex = i->ipi6_ifindex;

p->destination.in6 = i->ipi6_addr;

break;

}

case IPV6_HOPLIMIT:

p->ttl = *(int *) CMSG_DATA(cmsg);

break;

}

} else if (cmsg->cmsg_level == IPPROTO_IP) {

assert(p->family == AF_INET);

switch (cmsg->cmsg_type) {

case IP_PKTINFO: {

struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);

if (p->ifindex <= 0)

p->ifindex = i->ipi_ifindex;

p->destination.in = i->ipi_addr;

break;

}

case IP_TTL:

p->ttl = *(int *) CMSG_DATA(cmsg);

break;

}

}

}

/* The Linux kernel sets the interface index to the loopback

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

if (p->ifindex <= 0)

p->ifindex = manager_find_ifindex(m, p->family, &p->destination);

}

*ret = p;

p = NULL;

return 1;

}

static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {

int r;

assert(fd >= 0);

assert(mh);

for (;;) {

if (sendmsg(fd, mh, flags) >= 0)

return 0;

if (errno == EINTR)

continue;

if (errno != EAGAIN)

return -errno;

r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);

if (r < 0)

return r;

if (r == 0)

return -ETIMEDOUT;

}

}

static int write_loop(int fd, void *message, size_t length) {

int r;

assert(fd >= 0);

assert(message);

for (;;) {

if (write(fd, message, length) >= 0)

return 0;

if (errno == EINTR)

continue;

if (errno != EAGAIN)

return -errno;

r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);

if (r < 0)

return r;

if (r == 0)

return -ETIMEDOUT;

}

}

int manager_write(Manager *m, int fd, DnsPacket *p) {

int r;

log_debug("Sending %s packet with id %" PRIu16 ".", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p));

r = write_loop(fd, DNS_PACKET_DATA(p), p->size);

if (r < 0)

return r;

return 0;

}

static int manager_ipv4_send(Manager *m, int fd, int ifindex, const struct in_addr *addr, uint16_t port, DnsPacket *p) {

union sockaddr_union sa = {

.in.sin_family = AF_INET,

};

union {

struct cmsghdr header; /* For alignment */

uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))];

} control;

struct msghdr mh = {};

struct iovec iov;

assert(m);

assert(fd >= 0);

assert(addr);

assert(port > 0);

assert(p);

iov.iov_base = DNS_PACKET_DATA(p);

iov.iov_len = p->size;

sa.in.sin_addr = *addr;

sa.in.sin_port = htobe16(port),

mh.msg_iov = &iov;

mh.msg_iovlen = 1;

mh.msg_name = &sa.sa;

mh.msg_namelen = sizeof(sa.in);

if (ifindex > 0) {

struct cmsghdr *cmsg;

struct in_pktinfo *pi;

zero(control);

mh.msg_control = &control;

mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo));

cmsg = CMSG_FIRSTHDR(&mh);

cmsg->cmsg_len = mh.msg_controllen;

cmsg->cmsg_level = IPPROTO_IP;

cmsg->cmsg_type = IP_PKTINFO;

pi = (struct in_pktinfo*) CMSG_DATA(cmsg);

pi->ipi_ifindex = ifindex;

}

return sendmsg_loop(fd, &mh, 0);

}

static int manager_ipv6_send(Manager *m, int fd, int ifindex, const struct in6_addr *addr, uint16_t port, DnsPacket *p) {

union sockaddr_union sa = {

.in6.sin6_family = AF_INET6,

};

union {

struct cmsghdr header; /* For alignment */

uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))];

} control;

struct msghdr mh = {};

struct iovec iov;

assert(m);

assert(fd >= 0);

assert(addr);

assert(port > 0);

assert(p);

iov.iov_base = DNS_PACKET_DATA(p);

iov.iov_len = p->size;

sa.in6.sin6_addr = *addr;

sa.in6.sin6_port = htobe16(port),

sa.in6.sin6_scope_id = ifindex;

mh.msg_iov = &iov;

mh.msg_iovlen = 1;

mh.msg_name = &sa.sa;

mh.msg_namelen = sizeof(sa.in6);

if (ifindex > 0) {

struct cmsghdr *cmsg;

struct in6_pktinfo *pi;

zero(control);

mh.msg_control = &control;

mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo));

cmsg = CMSG_FIRSTHDR(&mh);

cmsg->cmsg_len = mh.msg_controllen;

cmsg->cmsg_level = IPPROTO_IPV6;

cmsg->cmsg_type = IPV6_PKTINFO;

pi = (struct in6_pktinfo*) CMSG_DATA(cmsg);

pi->ipi6_ifindex = ifindex;

}

return sendmsg_loop(fd, &mh, 0);

}

int manager_send(Manager *m, int fd, int ifindex, int family, const union in_addr_union *addr, uint16_t port, DnsPacket *p) {

assert(m);

assert(fd >= 0);

assert(addr);

assert(port > 0);

assert(p);

log_debug("Sending %s packet with id %" PRIu16 " on interface %i/%s.", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p), ifindex, af_to_name(family));

if (family == AF_INET)

return manager_ipv4_send(m, fd, ifindex, &addr->in, port, p);

else if (family == AF_INET6)

return manager_ipv6_send(m, fd, ifindex, &addr->in6, port, p);

return -EAFNOSUPPORT;

}

uint32_t manager_find_mtu(Manager *m) {

uint32_t mtu = 0;

Link *l;

Iterator i;

/* If we don't know on which link a DNS packet would be

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

random_bytes(&a, sizeof(a));

u += 1 + a % 10;

if (asprintf(&h, "%.*s%" PRIu64, (int) (p - m->llmnr_hostname), m->llmnr_hostname, u) < 0)

return -ENOMEM;

r = dns_name_concat(h, "local", &k);

if (r < 0) {

free(h);

return r;

}

log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h);

free(m->llmnr_hostname);

m->llmnr_hostname = h;

free(m->mdns_hostname);

m->mdns_hostname = k;

manager_refresh_rrs(m);

return 0;

}

LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) {

Iterator i;

Link *l;

assert(m);

HASHMAP_FOREACH(l, m->links, i) {

LinkAddress *a;

a = link_find_address(l, family, in_addr);

if (a)

return a;

}

return NULL;

}

bool manager_our_packet(Manager *m, DnsPacket *p) {

assert(m);

assert(p);

return !!manager_find_link_address(m, p->family, &p->sender);

}

DnsScope* manager_find_scope(Manager *m, DnsPacket *p) {

Link *l;

assert(m);

assert(p);

l = hashmap_get(m->links, INT_TO_PTR(p->ifindex));

if (!l)

return NULL;

switch (p->protocol) {

case DNS_PROTOCOL_LLMNR:

if (p->family == AF_INET)

return l->llmnr_ipv4_scope;

else if (p->family == AF_INET6)

return l->llmnr_ipv6_scope;

break;

case DNS_PROTOCOL_MDNS:

if (p->family == AF_INET)

return l->mdns_ipv4_scope;

else if (p->family == AF_INET6)

return l->mdns_ipv6_scope;

break;

default:

break;

}

return NULL;

}

void manager_verify_all(Manager *m) {

DnsScope *s;

assert(m);

LIST_FOREACH(scopes, s, m->dns_scopes)

dns_zone_verify_all(&s->zone);

}

int manager_is_own_hostname(Manager *m, const char *name) {

int r;

assert(m);

assert(name);

if (m->llmnr_hostname) {

r = dns_name_equal(name, m->llmnr_hostname);

if (r != 0)

return r;

}

if (m->mdns_hostname)

return dns_name_equal(name, m->mdns_hostname);

return 0;

}

int manager_compile_dns_servers(Manager *m, OrderedSet **dns) {

DnsServer *s;

Iterator i;

Link *l;

int r;

assert(m);

assert(dns);

r = ordered_set_ensure_allocated(dns, &dns_server_hash_ops);

if (r < 0)

return r;

/* First add the system-wide servers and domains */

LIST_FOREACH(servers, s, m->dns_servers) {

r = ordered_set_put(*dns, s);

if (r == -EEXIST)

continue;

if (r < 0)

return r;

}

/* Then, add the per-link servers */

HASHMAP_FOREACH(l, m->links, i) {

LIST_FOREACH(servers, s, l->dns_servers) {

r = ordered_set_put(*dns, s);

if (r == -EEXIST)

continue;

if (r < 0)

return r;

}

}

/* If we found nothing, add the fallback servers */

if (ordered_set_isempty(*dns)) {

LIST_FOREACH(servers, s, m->fallback_dns_servers) {

r = ordered_set_put(*dns, s);

if (r == -EEXIST)

continue;

if (r < 0)

return r;

}

}

return 0;

}

int manager_compile_search_domains(Manager *m, OrderedSet **domains) {

DnsSearchDomain *d;

Iterator i;

Link *l;

int r;

assert(m);

assert(domains);

r = ordered_set_ensure_allocated(domains, &dns_name_hash_ops);

if (r < 0)

return r;

LIST_FOREACH(domains, d, m->search_domains) {

r = ordered_set_put(*domains, d->name);

if (r == -EEXIST)

continue;

if (r < 0)

return r;

}

HASHMAP_FOREACH(l, m->links, i) {

LIST_FOREACH(domains, d, l->search_domains) {

r = ordered_set_put(*domains, d->name);

if (r == -EEXIST)

continue;

if (r < 0)

return r;

}

}

return 0;

}

static const char* const support_table[_SUPPORT_MAX] = {

[SUPPORT_NO] = "no",

[SUPPORT_YES] = "yes",

[SUPPORT_RESOLVE] = "resolve",

};

DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(support, Support, SUPPORT_YES);