along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
-#include <arpa/inet.h>
-#include <resolv.h>
-#include <net/if.h>
-#include <sys/ioctl.h>
-#include <sys/poll.h>
#include <netinet/in.h>
+#include <poll.h>
+#include <sys/ioctl.h>
-#include "rtnl-util.h"
-#include "event-util.h"
-#include "network-util.h"
+#include "af-list.h"
+#include "alloc-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 "conf-parser.h"
+#include "ordered-set.h"
+#include "parse-util.h"
+#include "random-util.h"
+#include "resolved-bus.h"
+#include "resolved-conf.h"
+#include "resolved-llmnr.h"
+#include "resolved-manager.h"
+#include "resolved-resolv-conf.h"
#include "socket-util.h"
-#include "af-list.h"
-#include "resolved.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_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) {
+static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
Manager *m = userdata;
uint16_t type;
Link *l;
assert(m);
assert(mm);
- r = sd_rtnl_message_get_type(mm, &type);
+ r = sd_netlink_message_get_type(mm, &type);
if (r < 0)
goto fail;
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);
return 0;
fail:
- log_warning("Failed to process RTNL link message: %s", strerror(-r));
+ 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) {
+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;
assert(mm);
assert(m);
- r = sd_rtnl_message_get_type(mm, &type);
+ r = sd_netlink_message_get_type(mm, &type);
if (r < 0)
goto fail;
switch (family) {
case AF_INET:
- r = sd_rtnl_message_read_in_addr(mm, IFA_LOCAL, &address.in);
+ r = sd_netlink_message_read_in_addr(mm, IFA_LOCAL, &address.in);
if (r < 0) {
- r = sd_rtnl_message_read_in_addr(mm, IFA_ADDRESS, &address.in);
+ r = sd_netlink_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);
+ r = sd_netlink_message_read_in6_addr(mm, IFA_LOCAL, &address.in6);
if (r < 0) {
- r = sd_rtnl_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6);
+ r = sd_netlink_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6);
if (r < 0)
goto fail;
}
break;
case RTM_DELADDR:
- if (a)
- link_address_free(a);
+ link_address_free(a);
break;
}
return 0;
fail:
- log_warning("Failed to process RTNL address message: %s", strerror(-r));
+ 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;
+ _cleanup_netlink_message_unref_ sd_netlink_message *req = NULL, *reply = NULL;
+ sd_netlink_message *i;
int r;
assert(m);
- /* First, subscibe to interfaces coming and going */
- r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR);
+ /* First, subscribe to interfaces coming and going */
+ r = sd_netlink_open(&m->rtnl);
if (r < 0)
return r;
- r = sd_rtnl_attach_event(m->rtnl, m->event, 0);
+ r = sd_netlink_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);
+ r = sd_netlink_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);
+ r = sd_netlink_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);
+ r = sd_netlink_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);
+ r = sd_netlink_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m);
if (r < 0)
return r;
if (r < 0)
return r;
- r = sd_rtnl_message_request_dump(req, true);
+ r = sd_netlink_message_request_dump(req, true);
if (r < 0)
return r;
- r = sd_rtnl_call(m->rtnl, req, 0, &reply);
+ r = sd_netlink_call(m->rtnl, req, 0, &reply);
if (r < 0)
return r;
- for (i = reply; i; i = sd_rtnl_message_next(i)) {
+ 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_rtnl_message_unref(req);
- reply = sd_rtnl_message_unref(reply);
+ 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_rtnl_message_request_dump(req, true);
+ r = sd_netlink_message_request_dump(req, true);
if (r < 0)
return r;
- r = sd_rtnl_call(m->rtnl, req, 0, &reply);
+ r = sd_netlink_call(m->rtnl, req, 0, &reply);
if (r < 0)
return r;
- for (i = reply; i; i = sd_rtnl_message_next(i)) {
+ for (i = reply; i; i = sd_netlink_message_next(i)) {
r = manager_process_address(m->rtnl, i, m);
if (r < 0)
return r;
HASHMAP_FOREACH(l, m->links, i) {
r = link_update_monitor(l);
if (r < 0)
- log_warning("Failed to update monitor information for %i: %s", l->ifindex, strerror(-r));
+ 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("Could not update resolv.conf: %s", strerror(-r));
+ log_warning_errno(r, "Could not update resolv.conf: %m");
return 0;
}
return 0;
}
-static int parse_dns_server_string(Manager *m, const char *string) {
- const char *word, *state;
- size_t length;
- int r;
+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(m);
- assert(string);
+ assert(llmnr_hostname);
+ assert(mdns_hostname);
- FOREACH_WORD_QUOTED(word, length, string, state) {
- char buffer[length+1];
- int family;
- union in_addr_union addr;
+ /* Extract and normalize the first label of the locally
+ * configured hostname, and check it's not "localhost". */
- memcpy(buffer, word, length);
- buffer[length] = 0;
+ h = gethostname_malloc();
+ if (!h)
+ return log_oom();
- r = in_addr_from_string_auto(buffer, &family, &addr);
- if (r < 0) {
- log_warning("Ignoring invalid DNS address '%s'", buffer);
- continue;
- }
+ 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;
+ }
- /* filter out duplicates */
- if (manager_find_dns_server(m, family, &addr))
- continue;
+ 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;
- r = dns_server_new(m, NULL, NULL, family, &addr);
- if (r < 0)
- return r;
+ if (!utf8_is_valid(label)) {
+ log_error("System hostname is not UTF-8 clean.");
+ return -EINVAL;
}
- /* do not warn about state here, since probably systemd already did */
+
+ r = dns_label_escape(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;
}
-int config_parse_dnsv(
- const char *unit,
- const char *filename,
- unsigned line,
- const char *section,
- unsigned section_line,
- const char *lvalue,
- int ltype,
- const char *rvalue,
- void *data,
- void *userdata) {
-
+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(filename);
- assert(lvalue);
- assert(rvalue);
assert(m);
- /* Empty assignment means clear the list */
- if (isempty(rvalue)) {
- while (m->dns_servers)
- dns_server_free(m->dns_servers);
+ 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 = parse_dns_server_string(m, rvalue);
+ r = sd_event_add_io(m->event, &m->hostname_event_source, m->hostname_fd, 0, on_hostname_change, m);
if (r < 0) {
- log_error("Failed to parse DNS server string");
- return r;
+ 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;
}
-int manager_parse_config_file(Manager *m) {
+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);
- return config_parse(NULL, "/etc/systemd/resolved.conf", NULL,
- "Resolve\0",
- config_item_perf_lookup, resolved_gperf_lookup,
- false, false, true, 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) {
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->use_llmnr = true;
-
- r = parse_dns_server_string(m, DNS_SERVERS);
- if (r < 0)
- return r;
-
- m->hostname = gethostname_malloc();
- if (!m->hostname)
- return -ENOMEM;
+ m->llmnr_support = SUPPORT_YES;
+ m->read_resolv_conf = true;
+ m->need_builtin_fallbacks = true;
r = sd_event_default(&m->event);
if (r < 0)
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;
if (r < 0)
return r;
- r = manager_llmnr_ipv4_udp_fd(m);
- if (r < 0)
- return r;
- r = manager_llmnr_ipv6_udp_fd(m);
- if (r < 0)
- return r;
- r = manager_llmnr_ipv4_tcp_fd(m);
- if (r < 0)
- return r;
- r = manager_llmnr_ipv6_tcp_fd(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;
+
+ return 0;
+}
+
Manager *manager_free(Manager *m) {
Link *l;
if (!m)
return NULL;
- while (m->dns_queries)
- dns_query_free(m->dns_queries);
-
- hashmap_free(m->dns_query_transactions);
+ manager_flush_dns_servers(m, DNS_SERVER_SYSTEM);
+ manager_flush_dns_servers(m, DNS_SERVER_FALLBACK);
while ((l = hashmap_first(m->links)))
link_free(l);
- hashmap_free(m->links);
+
+ while (m->dns_queries)
+ dns_query_free(m->dns_queries);
dns_scope_free(m->unicast_scope);
- while (m->dns_servers)
- dns_server_free(m->dns_servers);
+ 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);
-
- sd_event_source_unref(m->llmnr_ipv4_udp_event_source);
- sd_event_source_unref(m->llmnr_ipv6_udp_event_source);
- safe_close(m->llmnr_ipv4_udp_fd);
- safe_close(m->llmnr_ipv6_udp_fd);
+ sd_netlink_unref(m->rtnl);
+ sd_event_source_unref(m->rtnl_event_source);
- sd_event_source_unref(m->llmnr_ipv4_tcp_event_source);
- sd_event_source_unref(m->llmnr_ipv6_tcp_event_source);
- safe_close(m->llmnr_ipv4_tcp_fd);
- safe_close(m->llmnr_ipv6_tcp_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);
- free(m->hostname);
- free(m);
-
- return NULL;
-}
-
-static void write_resolve_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("Invalid DNS address. Ignoring.");
- 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) ++;
-}
-
-int manager_write_resolv_conf(Manager *m) {
- const char *path = "/run/systemd/resolve/resolv.conf";
- _cleanup_free_ char *temp_path = NULL;
- _cleanup_fclose_ FILE *f = NULL;
- unsigned count = 0;
- DnsServer *s;
- Iterator i;
- Link *l;
- int r;
-
- assert(m);
-
- r = fopen_temporary(path, &f, &temp_path);
- if (r < 0)
- return r;
-
- fchmod(fileno(f), 0644);
-
- 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);
+ sd_event_source_unref(m->sigusr1_event_source);
- HASHMAP_FOREACH(l, m->links, i)
- LIST_FOREACH(servers, s, l->dns_servers)
- write_resolve_conf_server(s, f, &count);
+ sd_event_unref(m->event);
- LIST_FOREACH(servers, s, m->dns_servers)
- write_resolve_conf_server(s, f, &count);
+ dns_resource_key_unref(m->llmnr_host_ipv4_key);
+ dns_resource_key_unref(m->llmnr_host_ipv6_key);
- r = fflush_and_check(f);
- if (r < 0)
- goto fail;
-
- if (rename(temp_path, path) < 0) {
- r = -errno;
- goto fail;
- }
+ sd_event_source_unref(m->hostname_event_source);
+ safe_close(m->hostname_fd);
+ free(m->llmnr_hostname);
+ free(m->mdns_hostname);
- return 0;
+ free(m);
-fail:
- unlink(path);
- unlink(temp_path);
- return r;
+ 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(MAX(sizeof(struct in_pktinfo), sizeof(struct in6_pktinfo)))
+ 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;
} else
return -EAFNOSUPPORT;
- for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg)) {
+ CMSG_FOREACH(cmsg, &mh) {
if (cmsg->cmsg_level == IPPROTO_IPV6) {
assert(p->family == AF_INET6);
* 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 > 0 && manager_ifindex_is_loopback(m, p->ifindex) != 0)
+ 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);
+ 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 on_dns_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
- _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
- DnsQueryTransaction *t = NULL;
- Manager *m = userdata;
+static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
int r;
- r = manager_recv(m, fd, DNS_PROTOCOL_DNS, &p);
- if (r <= 0)
- return r;
+ assert(fd >= 0);
+ assert(mh);
- if (dns_packet_validate_reply(p) > 0) {
- t = hashmap_get(m->dns_query_transactions, UINT_TO_PTR(DNS_PACKET_ID(p)));
- if (!t)
+ for (;;) {
+ if (sendmsg(fd, mh, flags) >= 0)
return 0;
- dns_query_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;
+ if (errno == EINTR)
+ continue;
- m->dns_ipv6_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
- if (m->dns_ipv6_fd < 0)
- return -errno;
+ if (errno != EAGAIN)
+ return -errno;
- r = setsockopt(m->dns_ipv6_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one));
- if (r < 0) {
- r = -errno;
- goto fail;
+ r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -ETIMEDOUT;
}
-
- 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) {
+static int write_loop(int fd, void *message, size_t length) {
int r;
assert(fd >= 0);
- assert(mh);
+ assert(message);
for (;;) {
- if (sendmsg(fd, mh, flags) >= 0)
+ if (write(fd, message, length) >= 0)
return 0;
if (errno == EINTR)
}
}
+int manager_write(Manager *m, int fd, DnsPacket *p) {
+ int r;
+
+ log_debug("Sending %s packet with id %u", 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,
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))
- return s;
- }
-
- return NULL;
-}
-
-DnsServer *manager_get_dns_server(Manager *m) {
- assert(m);
-
- if (!m->current_dns_server)
- m->current_dns_server = m->dns_servers;
-
- return m->current_dns_server;
-}
-
-void manager_next_dns_server(Manager *m) {
- assert(m);
-
- if (!m->current_dns_server) {
- m->current_dns_server = m->dns_servers;
- return;
- }
-
- if (!m->current_dns_server)
- return;
-
- if (m->current_dns_server->servers_next) {
- m->current_dns_server = m->current_dns_server->servers_next;
- return;
- }
-
- m->current_dns_server = m->dns_servers;
-}
-
uint32_t manager_find_mtu(Manager *m) {
uint32_t mtu = 0;
Link *l;
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;
- DnsQueryTransaction *t = NULL;
- Manager *m = userdata;
- int r;
-
- r = manager_recv(m, fd, DNS_PROTOCOL_LLMNR, &p);
- if (r <= 0)
- return r;
-
- if (dns_packet_validate_reply(p) > 0) {
- log_debug("Got reply packet for id %u", DNS_PACKET_ID(p));
-
- t = hashmap_get(m->dns_query_transactions, UINT_TO_PTR(DNS_PACKET_ID(p)));
- if (!t)
- return 0;
-
- dns_query_transaction_process_reply(t, p);
-
- } else if (dns_packet_validate_query(p) > 0) {
- Link *l;
-
- l = hashmap_get(m->links, INT_TO_PTR(p->ifindex));
- if (l) {
- DnsScope *scope = NULL;
+int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) {
+ LinkAddress *a;
- if (p->family == AF_INET)
- scope = l->llmnr_ipv4_scope;
- else if (p->family == AF_INET6)
- scope = l->llmnr_ipv6_scope;
+ assert(m);
- if (scope)
- dns_scope_process_query(scope, NULL, p);
- }
- } else
- log_debug("Invalid LLMNR packet.");
+ a = manager_find_link_address(m, family, in_addr);
+ if (a)
+ return a->link->ifindex;
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;
+void manager_refresh_rrs(Manager *m) {
+ Iterator i;
+ Link *l;
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;
- }
+ 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);
- r = bind(m->llmnr_ipv4_udp_fd, &sa.sa, sizeof(sa.in));
- if (r < 0) {
- r = -errno;
- goto fail;
+ HASHMAP_FOREACH(l, m->links, i) {
+ link_add_rrs(l, true);
+ link_add_rrs(l, false);
}
-
- 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 manager_next_hostname(Manager *m) {
+ const char *p;
+ uint64_t u, a;
+ char *h, *k;
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;
+ p = strchr(m->llmnr_hostname, 0);
+ assert(p);
- r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl));
- if (r < 0) {
- r = -errno;
- goto fail;
- }
+ while (p > m->llmnr_hostname) {
+ if (!strchr("0123456789", p[-1]))
+ break;
- /* 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;
+ p--;
}
- r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &one, sizeof(one));
- if (r < 0) {
- r = -errno;
- goto fail;
- }
+ if (*p == 0 || safe_atou64(p, &u) < 0 || u <= 0)
+ u = 1;
- r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
- if (r < 0) {
- r = -errno;
- goto fail;
- }
+ /* 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 */
- r = setsockopt(m->llmnr_ipv6_udp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
- if (r < 0) {
- r = -errno;
- goto fail;
- }
+ random_bytes(&a, sizeof(a));
+ u += 1 + a % 10;
- r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one));
- if (r < 0) {
- r = -errno;
- goto fail;
- }
+ if (asprintf(&h, "%.*s%" PRIu64, (int) (p - m->llmnr_hostname), m->llmnr_hostname, u) < 0)
+ return -ENOMEM;
- r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one));
+ r = dns_name_concat(h, "local", &k);
if (r < 0) {
- r = -errno;
- goto fail;
+ free(h);
+ return r;
}
- r = bind(m->llmnr_ipv6_udp_fd, &sa.sa, sizeof(sa.in6));
- if (r < 0) {
- r = -errno;
- goto fail;
- }
+ log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m->llmnr_hostname, h);
- 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;
- }
+ free(m->llmnr_hostname);
+ m->llmnr_hostname = h;
- return m->llmnr_ipv6_udp_fd;
+ free(m->mdns_hostname);
+ m->mdns_hostname = k;
-fail:
- m->llmnr_ipv6_udp_fd = safe_close(m->llmnr_ipv6_udp_fd);
- return r;
-}
+ manager_refresh_rrs(m);
-static int on_llmnr_stream_packet(DnsStream *s) {
- assert(s);
-
- if (dns_packet_validate_query(s->read_packet) > 0) {
- Link *l;
-
- l = hashmap_get(s->manager->links, INT_TO_PTR(s->read_packet->ifindex));
- if (l) {
- DnsScope *scope = NULL;
-
- if (s->read_packet->family == AF_INET)
- scope = l->llmnr_ipv4_scope;
- else if (s->read_packet->family == AF_INET6)
- scope = l->llmnr_ipv6_scope;
-
- if (scope) {
- 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;
- }
- }
- }
-
- 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;
+LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr) {
+ Iterator i;
+ Link *l;
- cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
- if (cfd < 0) {
- if (errno == EAGAIN || errno == EINTR)
- return 0;
+ assert(m);
- return -errno;
- }
+ HASHMAP_FOREACH(l, m->links, i) {
+ LinkAddress *a;
- r = dns_stream_new(m, &stream, DNS_PROTOCOL_LLMNR, cfd);
- if (r < 0) {
- safe_close(cfd);
- return r;
+ a = link_find_address(l, family, in_addr);
+ if (a)
+ return a;
}
- stream->on_packet = on_llmnr_stream_packet;
- return 0;
+ return NULL;
}
-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;
-
+bool manager_our_packet(Manager *m, DnsPacket *p) {
assert(m);
+ assert(p);
- 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;
- }
+ return !!manager_find_link_address(m, p->family, &p->sender);
+}
- r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one));
- if (r < 0) {
- r = -errno;
- goto fail;
- }
+DnsScope* manager_find_scope(Manager *m, DnsPacket *p) {
+ Link *l;
- r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof(one));
- if (r < 0) {
- r = -errno;
- goto fail;
- }
+ assert(m);
+ assert(p);
- /* 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;
- }
+ l = hashmap_get(m->links, INT_TO_PTR(p->ifindex));
+ if (!l)
+ return NULL;
- r = bind(m->llmnr_ipv4_tcp_fd, &sa.sa, sizeof(sa.in));
- if (r < 0) {
- r = -errno;
- goto fail;
+ 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;
}
- r = listen(m->llmnr_ipv4_tcp_fd, SOMAXCONN);
- if (r < 0) {
- r = -errno;
- goto fail;
- }
+ return NULL;
+}
- 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;
+void manager_verify_all(Manager *m) {
+ DnsScope *s;
- return m->llmnr_ipv4_tcp_fd;
+ assert(m);
-fail:
- m->llmnr_ipv4_tcp_fd = safe_close(m->llmnr_ipv4_tcp_fd);
- return r;
+ LIST_FOREACH(scopes, s, m->dns_scopes)
+ dns_zone_verify_all(&s->zone);
}
-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 manager_is_own_hostname(Manager *m, const char *name) {
int r;
assert(m);
+ assert(name);
- 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;
+ if (m->llmnr_hostname) {
+ r = dns_name_equal(name, m->llmnr_hostname);
+ if (r != 0)
+ return r;
}
- return m->llmnr_ipv6_tcp_fd;
-
-fail:
- m->llmnr_ipv6_tcp_fd = safe_close(m->llmnr_ipv6_tcp_fd);
- return r;
-}
-
-int manager_ifindex_is_loopback(Manager *m, int ifindex) {
- Link *l;
- assert(m);
-
- if (ifindex <= 0)
- return -EINVAL;
-
- l = hashmap_get(m->links, INT_TO_PTR(ifindex));
- if (l->flags & IFF_LOOPBACK)
- return 1;
+ if (m->mdns_hostname)
+ return dns_name_equal(name, m->mdns_hostname);
return 0;
}
-int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) {
- Link *l;
- Iterator i;
-
- assert(m);
-
- HASHMAP_FOREACH(l, m->links, i)
- if (link_find_address(l, family, in_addr))
- return l->ifindex;
-
- return 0;
-}
+static const char* const support_table[_SUPPORT_MAX] = {
+ [SUPPORT_NO] = "no",
+ [SUPPORT_YES] = "yes",
+ [SUPPORT_RESOLVE] = "resolve",
+};
+DEFINE_STRING_TABLE_LOOKUP(support, Support);
projects / thirdparty / systemd.git / blobdiff