#include "resolved-dns-domain.h"
#include "resolved-dns-packet.h"
-int dns_packet_new(DnsPacket **ret, size_t mtu) {
+int dns_packet_new(DnsPacket **ret, DnsProtocol protocol, size_t mtu) {
DnsPacket *p;
size_t a;
p->size = p->rindex = DNS_PACKET_HEADER_SIZE;
p->allocated = a;
+ p->protocol = protocol;
p->n_ref = 1;
*ret = p;
return 0;
}
-int dns_packet_new_query(DnsPacket **ret, size_t mtu) {
+int dns_packet_new_query(DnsPacket **ret, DnsProtocol protocol, size_t mtu) {
DnsPacket *p;
DnsPacketHeader *h;
int r;
assert(ret);
- r = dns_packet_new(&p, mtu);
+ r = dns_packet_new(&p, protocol, mtu);
if (r < 0)
return r;
h = DNS_PACKET_HEADER(p);
- h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0, 0, 0, 0, 1, 0, 0, 0, 0));
+
+ if (protocol == DNS_PROTOCOL_DNS)
+ h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0, 0, 0, 0, 1, 0, 0, 0, 0)); /* ask for recursion */
+ else
+ h->flags = htobe16(DNS_PACKET_MAKE_FLAGS(0, 0, 0, 0, 0, 0, 0, 0, 0));
*ret = p;
return 0;
[DNS_RCODE_BADTRUNC] = "BADTRUNC",
};
DEFINE_STRING_TABLE_LOOKUP(dns_rcode, int);
+
+static const char* const dns_protocol_table[_DNS_PROTOCOL_MAX] = {
+ [DNS_PROTOCOL_DNS] = "dns",
+ [DNS_PROTOCOL_MDNS] = "mdns",
+ [DNS_PROTOCOL_LLMNR] = "llmnr",
+};
+DEFINE_STRING_TABLE_LOOKUP(dns_protocol, DnsProtocol);
#include "hashmap.h"
#include "resolved-dns-rr.h"
+typedef enum DnsProtocol {
+ DNS_PROTOCOL_DNS,
+ DNS_PROTOCOL_MDNS,
+ DNS_PROTOCOL_LLMNR,
+ _DNS_PROTOCOL_MAX,
+ _DNS_PROTOCOL_INVALID = -1
+} DnsProtocol;
+
struct DnsPacketHeader {
uint16_t id;
be16_t flags;
struct DnsPacket {
int n_ref;
- int ifindex;
+ DnsProtocol protocol;
size_t size, allocated, rindex;
+ void *data;
Hashmap *names; /* For name compression */
DnsResourceRecord **rrs;
- void *data;
+
+ /* Packet reception meta data */
+ int ifindex;
+ unsigned char family;
+ union in_addr_union sender, destination;
+ unsigned ttl;
};
static inline uint8_t* DNS_PACKET_DATA(DnsPacket *p) {
(unsigned) DNS_PACKET_ARCOUNT(p);
}
-int dns_packet_new(DnsPacket **p, size_t mtu);
-int dns_packet_new_query(DnsPacket **p, size_t mtu);
+int dns_packet_new(DnsPacket **p, DnsProtocol protocol, size_t mtu);
+int dns_packet_new_query(DnsPacket **p, DnsProtocol protocol, size_t mtu);
DnsPacket *dns_packet_ref(DnsPacket *p);
DnsPacket *dns_packet_unref(DnsPacket *p);
const char* dns_rcode_to_string(int i) _const_;
int dns_rcode_from_string(const char *s) _pure_;
+
+const char* dns_protocol_to_string(DnsProtocol p) _const_;
+DnsProtocol dns_protocol_from_string(const char *s) _pure_;
+
+#define LLMNR_MULTICAST_IPV4_ADDRESS ((struct in_addr) { .s_addr = htobe32(224U << 24 | 252U) })
+#define LLMNR_MULTICAST_IPV6_ADDRESS ((struct in6_addr) { .s6_addr = { 0xFF, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x03 } })
ssize_t ss;
if (!t->received) {
- r = dns_packet_new(&t->received, be16toh(t->tcp_read_size));
+ r = dns_packet_new(&t->received, t->scope->protocol, be16toh(t->tcp_read_size));
if (r < 0) {
dns_query_transaction_complete(t, DNS_QUERY_RESOURCES);
return r;
assert(t);
+ if (t->scope->protocol == DNS_PROTOCOL_DNS)
+ return -ENOTSUP;
+
if (t->tcp_fd >= 0)
return 0;
static int dns_query_make_packet(DnsQueryTransaction *t) {
_cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
- unsigned n;
+ unsigned n, added = 0;
int r;
assert(t);
if (t->sent)
return 0;
- r = dns_packet_new_query(&p, 0);
+ r = dns_packet_new_query(&p, t->scope->protocol, 0);
if (r < 0)
return r;
for (n = 0; n < t->query->n_keys; n++) {
+ r = dns_scope_good_key(t->scope, &t->query->keys[n]);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
r = dns_packet_append_key(p, &t->query->keys[n], NULL);
if (r < 0)
return r;
+
+ added++;
}
- DNS_PACKET_HEADER(p)->qdcount = htobe16(t->query->n_keys);
+ if (added <= 0)
+ return -EDOM;
+
+ DNS_PACKET_HEADER(p)->qdcount = htobe16(added);
DNS_PACKET_HEADER(p)->id = t->id;
t->sent = p;
/* Otherwise, we need to ask the network */
r = dns_query_make_packet(t);
+ if (r == -EDOM) {
+ /* Not the right request to make on this network?
+ * (i.e. an A request made on IPv6 or an AAAA request
+ * made on IPv4, on LLMNR or mDNS.) */
+ dns_query_transaction_complete(t, DNS_QUERY_NO_SERVERS);
+ return 0;
+ }
if (r < 0)
return r;
if (r == -EMSGSIZE)
r = dns_query_transaction_open_tcp(t);
if (r == -ESRCH) {
+ /* No servers to send this to? */
dns_query_transaction_complete(t, DNS_QUERY_NO_SERVERS);
return 0;
}
LIST_FOREACH(scopes, s, q->manager->dns_scopes) {
DnsScopeMatch match;
- match = dns_scope_test(s, q->keys[0].name);
+ match = dns_scope_good_domain(s, q->keys[0].name);
if (match < 0)
return match;
LIST_FOREACH(scopes, s, first->scopes_next) {
DnsScopeMatch match;
- match = dns_scope_test(s, q->keys[0].name);
+ match = dns_scope_good_domain(s, q->keys[0].name);
if (match < 0)
return match;
#define SEND_TIMEOUT_USEC (2*USEC_PER_SEC)
-int dns_scope_new(Manager *m, DnsScope **ret, DnsScopeType t) {
+int dns_scope_new(Manager *m, DnsScope **ret, Link *l, DnsProtocol protocol, unsigned char family) {
DnsScope *s;
assert(m);
return -ENOMEM;
s->manager = m;
- s->type = t;
+ s->link = l;
+ s->protocol = protocol;
+ s->family = family;
LIST_PREPEND(scopes, m->dns_scopes, s);
+ dns_scope_llmnr_membership(s, true);
+
+ log_debug("New scope on link %s, protocol %s, family %s", strna(l ? l->name : NULL), dns_protocol_to_string(protocol), family_to_string(family));
+
*ret = s;
return 0;
}
if (!s)
return NULL;
+ log_debug("Removing scope on link %s, protocol %s, family %s", strna(s->link ? s->link->name : NULL), dns_protocol_to_string(s->protocol), family_to_string(s->family));
+
+ dns_scope_llmnr_membership(s, false);
+
while (s->transactions) {
DnsQuery *q;
DnsServer *dns_scope_get_server(DnsScope *s) {
assert(s);
+ if (s->protocol != DNS_PROTOCOL_DNS)
+ return NULL;
+
if (s->link)
return link_get_dns_server(s->link);
else
void dns_scope_next_dns_server(DnsScope *s) {
assert(s);
+ if (s->protocol != DNS_PROTOCOL_DNS)
+ return;
+
if (s->link)
link_next_dns_server(s->link);
else
}
int dns_scope_send(DnsScope *s, DnsPacket *p) {
- int ifindex = 0;
- DnsServer *srv;
- int r;
+ union in_addr_union addr;
+ int ifindex = 0, r;
+ unsigned char family;
+ uint16_t port;
+ uint32_t mtu;
+ int fd;
assert(s);
assert(p);
-
- srv = dns_scope_get_server(s);
- if (!srv)
- return -ESRCH;
+ assert(p->protocol == s->protocol);
if (s->link) {
- if (p->size > s->link->mtu)
- return -EMSGSIZE;
-
+ mtu = s->link->mtu;
ifindex = s->link->ifindex;
- } else {
- uint32_t mtu;
-
+ } else
mtu = manager_find_mtu(s->manager);
- if (mtu > 0) {
- if (p->size > mtu)
- return -EMSGSIZE;
- }
- }
- if (p->size > DNS_PACKET_UNICAST_SIZE_MAX)
- return -EMSGSIZE;
+ if (s->protocol == DNS_PROTOCOL_DNS) {
+ DnsServer *srv;
- if (srv->family == AF_INET)
- r = manager_dns_ipv4_send(s->manager, srv, ifindex, p);
- else if (srv->family == AF_INET6)
- r = manager_dns_ipv6_send(s->manager, srv, ifindex, p);
- else
+ srv = dns_scope_get_server(s);
+ if (!srv)
+ return -ESRCH;
+
+ family = srv->family;
+ addr = srv->address;
+ port = 53;
+
+ if (p->size > DNS_PACKET_UNICAST_SIZE_MAX)
+ return -EMSGSIZE;
+
+ if (p->size > mtu)
+ return -EMSGSIZE;
+
+ if (family == AF_INET)
+ fd = manager_dns_ipv4_fd(s->manager);
+ else if (family == AF_INET6)
+ fd = manager_dns_ipv6_fd(s->manager);
+ else
+ return -EAFNOSUPPORT;
+ if (fd < 0)
+ return fd;
+
+ } else if (s->protocol == DNS_PROTOCOL_LLMNR) {
+
+ if (DNS_PACKET_QDCOUNT(p) > 1)
+ return -ENOTSUP;
+
+ family = s->family;
+ port = 5355;
+
+ if (family == AF_INET) {
+ addr.in = LLMNR_MULTICAST_IPV4_ADDRESS;
+ /* fd = manager_dns_ipv4_fd(s->manager); */
+ fd = manager_llmnr_ipv4_udp_fd(s->manager);
+ } else if (family == AF_INET6) {
+ addr.in6 = LLMNR_MULTICAST_IPV6_ADDRESS;
+ fd = manager_llmnr_ipv6_udp_fd(s->manager);
+ /* fd = manager_dns_ipv6_fd(s->manager); */
+ } else
+ return -EAFNOSUPPORT;
+ if (fd < 0)
+ return fd;
+ } else
return -EAFNOSUPPORT;
+ r = manager_send(s->manager, fd, ifindex, family, &addr, port, p);
if (r < 0)
return r;
return ret;
}
-DnsScopeMatch dns_scope_test(DnsScope *s, const char *domain) {
+DnsScopeMatch dns_scope_good_domain(DnsScope *s, const char *domain) {
char **i;
assert(s);
if (is_localhost(domain))
return DNS_SCOPE_NO;
- if (s->type == DNS_SCOPE_MDNS) {
+ if (s->protocol == DNS_PROTOCOL_DNS) {
if (dns_name_endswith(domain, "254.169.in-addr.arpa") ||
- dns_name_endswith(domain, "0.8.e.f.ip6.arpa"))
- return DNS_SCOPE_YES;
- else if (dns_name_endswith(domain, "local") &&
- !dns_name_single_label(domain))
+ dns_name_endswith(domain, "0.8.e.f.ip6.arpa") ||
+ dns_name_single_label(domain))
+ return DNS_SCOPE_NO;
+
+ return DNS_SCOPE_MAYBE;
+ }
+
+ if (s->protocol == DNS_PROTOCOL_MDNS) {
+ if (dns_name_endswith(domain, "254.169.in-addr.arpa") ||
+ dns_name_endswith(domain, "0.8.e.f.ip6.arpa") ||
+ dns_name_endswith(domain, "local"))
return DNS_SCOPE_MAYBE;
return DNS_SCOPE_NO;
}
- if (s->type == DNS_SCOPE_DNS) {
+ if (s->protocol == DNS_PROTOCOL_LLMNR) {
if (dns_name_endswith(domain, "254.169.in-addr.arpa") ||
dns_name_endswith(domain, "0.8.e.f.ip6.arpa") ||
dns_name_single_label(domain))
- return DNS_SCOPE_NO;
+ return DNS_SCOPE_MAYBE;
- return DNS_SCOPE_MAYBE;
+ return DNS_SCOPE_NO;
}
- assert_not_reached("Unknown scope type");
+ assert_not_reached("Unknown scope protocol");
+}
+
+int dns_scope_good_key(DnsScope *s, DnsResourceKey *key) {
+ assert(s);
+ assert(key);
+
+ if (s->protocol == DNS_PROTOCOL_DNS)
+ return true;
+
+ /* On mDNS and LLMNR, send A and AAAA queries only on the
+ * respective scopes */
+
+ if (s->family == AF_INET && key->class == DNS_CLASS_IN && key->type == DNS_TYPE_AAAA)
+ return false;
+
+ if (s->family == AF_INET6 && key->class == DNS_CLASS_IN && key->type == DNS_TYPE_A)
+ return false;
+
+ return true;
+}
+
+int dns_scope_llmnr_membership(DnsScope *s, bool b) {
+ int fd;
+
+ if (s->family == AF_INET) {
+ struct ip_mreqn mreqn = {
+ .imr_multiaddr = LLMNR_MULTICAST_IPV4_ADDRESS,
+ .imr_ifindex = s->link->ifindex,
+ };
+
+ fd = manager_llmnr_ipv4_udp_fd(s->manager);
+ if (fd < 0)
+ return fd;
+
+ if (setsockopt(fd, IPPROTO_IP, b ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP, &mreqn, sizeof(mreqn)) < 0)
+ return -errno;
+
+ } else if (s->family == AF_INET6) {
+ struct ipv6_mreq mreq = {
+ .ipv6mr_multiaddr = LLMNR_MULTICAST_IPV6_ADDRESS,
+ .ipv6mr_interface = s->link->ifindex,
+ };
+
+ fd = manager_llmnr_ipv6_udp_fd(s->manager);
+ if (fd < 0)
+ return fd;
+
+ if (setsockopt(fd, IPPROTO_IPV6, b ? IPV6_ADD_MEMBERSHIP : IPV6_DROP_MEMBERSHIP, &mreq, sizeof(mreq)) < 0)
+ return -errno;
+ } else
+ return -EAFNOSUPPORT;
+
+ return 0;
}
#include "resolved-dns-query.h"
#include "resolved-dns-cache.h"
-typedef enum DnsScopeType {
- DNS_SCOPE_DNS,
- DNS_SCOPE_MDNS,
-} DnsScopeType;
-
typedef enum DnsScopeMatch {
DNS_SCOPE_NO,
DNS_SCOPE_MAYBE,
struct DnsScope {
Manager *manager;
- DnsScopeType type;
+ DnsProtocol protocol;
unsigned char family;
Link *link;
LIST_FIELDS(DnsScope, scopes);
};
-int dns_scope_new(Manager *m, DnsScope **ret, DnsScopeType t);
+int dns_scope_new(Manager *m, DnsScope **ret, Link *l, DnsProtocol p, unsigned char family);
DnsScope* dns_scope_free(DnsScope *s);
int dns_scope_send(DnsScope *s, DnsPacket *p);
int dns_scope_tcp_socket(DnsScope *s);
-DnsScopeMatch dns_scope_test(DnsScope *s, const char *domain);
+DnsScopeMatch dns_scope_good_domain(DnsScope *s, const char *domain);
+int dns_scope_good_key(DnsScope *s, DnsResourceKey *key);
DnsServer *dns_scope_get_server(DnsScope *s);
void dns_scope_next_dns_server(DnsScope *s);
+
+int dns_scope_llmnr_membership(DnsScope *s, bool b);
hashmap_remove(l->manager->links, INT_TO_PTR(l->ifindex));
dns_scope_free(l->unicast_scope);
- dns_scope_free(l->mdns_ipv4_scope);
- dns_scope_free(l->mdns_ipv6_scope);
+ dns_scope_free(l->llmnr_ipv4_scope);
+ dns_scope_free(l->llmnr_ipv6_scope);
while (l->dhcp_dns_servers)
dns_server_free(l->dhcp_dns_servers);
free(l);
return NULL;
- }
+}
+
+static void link_allocate_scopes(Link *l) {
+ int r;
+
+ assert(l);
+
+ if (l->link_dns_servers || l->dhcp_dns_servers) {
+ if (!l->unicast_scope) {
+ r = dns_scope_new(l->manager, &l->unicast_scope, l, DNS_PROTOCOL_DNS, AF_UNSPEC);
+ if (r < 0)
+ log_warning("Failed to allocate DNS scope: %s", strerror(-r));
+ }
+ } else
+ l->unicast_scope = dns_scope_free(l->unicast_scope);
+
+ if (link_relevant(l, AF_INET) && l->manager->use_llmnr) {
+ if (!l->llmnr_ipv4_scope) {
+ r = dns_scope_new(l->manager, &l->llmnr_ipv4_scope, l, DNS_PROTOCOL_LLMNR, AF_INET);
+ if (r < 0)
+ log_warning("Failed to allocate LLMNR IPv4 scope: %s", strerror(-r));
+ }
+ } else
+ l->llmnr_ipv4_scope = dns_scope_free(l->llmnr_ipv4_scope);
+
+ if (link_relevant(l, AF_INET6) && l->manager->use_llmnr) {
+ if (!l->llmnr_ipv6_scope) {
+ r = dns_scope_new(l->manager, &l->llmnr_ipv6_scope, l, DNS_PROTOCOL_LLMNR, AF_INET6);
+ if (r < 0)
+ log_warning("Failed to allocate LLMNR IPv6 scope: %s", strerror(-r));
+ }
+ } else
+ l->llmnr_ipv6_scope = dns_scope_free(l->llmnr_ipv6_scope);
+}
int link_update_rtnl(Link *l, sd_rtnl_message *m) {
+ const char *n = NULL;
int r;
assert(l);
return r;
sd_rtnl_message_read_u32(m, IFLA_MTU, &l->mtu);
+
+ if (sd_rtnl_message_read_string(m, IFLA_IFNAME, &n) >= 0) {
+ strncpy(l->name, n, sizeof(l->name));
+ char_array_0(l->name);
+ }
+
+ link_allocate_scopes(l);
return 0;
}
-static int update_dhcp_dns_servers(Link *l) {
+static int link_update_dhcp_dns_servers(Link *l) {
_cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
const struct in_addr *nameservers = NULL;
DnsServer *s, *nx;
return r;
}
-static int update_link_dns_servers(Link *l) {
+static int link_update_link_dns_servers(Link *l) {
_cleanup_free_ struct in_addr *nameservers = NULL;
_cleanup_free_ struct in6_addr *nameservers6 = NULL;
DnsServer *s, *nx;
int link_update_monitor(Link *l) {
assert(l);
- free(l->operational_state);
- l->operational_state = NULL;
-
- sd_network_get_link_operational_state(l->ifindex, &l->operational_state);
-
- update_dhcp_dns_servers(l);
- update_link_dns_servers(l);
+ link_update_dhcp_dns_servers(l);
+ link_update_link_dns_servers(l);
+ link_allocate_scopes(l);
return 0;
}
-bool link_relevant(Link *l) {
+bool link_relevant(Link *l, unsigned char family) {
+ _cleanup_free_ char *state = NULL;
LinkAddress *a;
assert(l);
if (l->flags & IFF_LOOPBACK)
return false;
- if (l->operational_state && !STR_IN_SET(l->operational_state, "unknown", "degraded", "routable"))
+ sd_network_get_link_operational_state(l->ifindex, &state);
+ if (state && !STR_IN_SET(state, "unknown", "degraded", "routable"))
return false;
LIST_FOREACH(addresses, a, l->addresses)
- if (link_address_relevant(a))
+ if (a->family == family && link_address_relevant(a))
return true;
return false;
assert(l);
- LIST_FOREACH(addresses, a, l->addresses) {
-
- if (a->family == family &&
- in_addr_equal(family, &a->in_addr, in_addr))
+ LIST_FOREACH(addresses, a, l->addresses)
+ if (a->family == family && in_addr_equal(family, &a->in_addr, in_addr))
return a;
- }
return NULL;
}
first = source == DNS_SERVER_DHCP ? l->dhcp_dns_servers : l->link_dns_servers;
- LIST_FOREACH(servers, s, first) {
-
- if (s->family == family &&
- in_addr_equal(family, &s->address, in_addr))
+ LIST_FOREACH(servers, s, first)
+ if (s->family == family && in_addr_equal(family, &s->address, in_addr))
return s;
- }
return NULL;
}
if (r < 0)
return r;
- r = sd_rtnl_message_addr_get_scope(m, &a->scope);
- if (r < 0)
- return r;
+ sd_rtnl_message_addr_get_scope(m, &a->scope);
+ link_allocate_scopes(a->link);
return 0;
}
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#include <net/if.h>
+
#include "in-addr-util.h"
#include "ratelimit.h"
DnsServer *current_dns_server;
DnsScope *unicast_scope;
- DnsScope *mdns_ipv4_scope;
- DnsScope *mdns_ipv6_scope;
+ DnsScope *llmnr_ipv4_scope;
+ DnsScope *llmnr_ipv6_scope;
+ char name[IF_NAMESIZE];
uint32_t mtu;
- char *operational_state;
-
RateLimit mdns_ratelimit;
+ RateLimit llmnr_ratelimit;
};
int link_new(Manager *m, Link **ret, int ifindex);
Link *link_free(Link *l);
int link_update_rtnl(Link *l, sd_rtnl_message *m);
int link_update_monitor(Link *l);
-bool link_relevant(Link *l);
+bool link_relevant(Link *l, unsigned char family);
LinkAddress* link_find_address(Link *l, unsigned char family, union in_addr_union *in_addr);
DnsServer* link_find_dns_server(Link *l, DnsServerSource source, unsigned char family, union in_addr_union *in_addr);
#include <arpa/inet.h>
#include <resolv.h>
-#include <linux/if.h>
+#include <net/if.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <netinet/in.h>
return -ENOMEM;
m->dns_ipv4_fd = m->dns_ipv6_fd = -1;
+ m->llmnr_ipv4_udp_fd = m->llmnr_ipv6_udp_fd = -1;
+
+ m->use_llmnr = true;
r = parse_dns_server_string(m, /* "172.31.0.125 2001:4860:4860::8888 2001:4860:4860::8889" */ DNS_SERVERS);
if (r < 0)
sd_event_set_watchdog(m->event, true);
- r = dns_scope_new(m, &m->unicast_scope, DNS_SCOPE_DNS);
+ r = dns_scope_new(m, &m->unicast_scope, NULL, DNS_PROTOCOL_DNS, AF_UNSPEC);
if (r < 0)
return r;
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_event_source_unref(m->bus_retry_event_source);
sd_bus_unref(m->bus);
assert(count);
r = in_addr_to_string(s->family, &s->address, &t);
- if (r < 0) {
+ if (r < 0) {
log_warning("Invalid DNS address. Ignoring.");
return;
}
return r;
}
-int manager_dns_ipv4_recv(Manager *m, DnsPacket **ret) {
+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)))
+ + CMSG_SPACE(int) /* ttl/hoplimit */
+ + 1024 /* kernel appears to require extra buffer space */];
+ } control;
+ union sockaddr_union sa;
struct msghdr mh = {};
- int fd, ms = 0, r;
+ struct cmsghdr *cmsg;
struct iovec iov;
+ int ms = 0, r;
ssize_t l;
assert(m);
+ assert(fd >= 0);
assert(ret);
- fd = manager_dns_ipv4_fd(m);
- if (fd < 0)
- return fd;
-
r = ioctl(fd, FIONREAD, &ms);
if (r < 0)
return -errno;
if (ms < 0)
return -EIO;
- r = dns_packet_new(&p, ms);
+ r = dns_packet_new(&p, protocol, ms);
if (r < 0)
return r;
iov.iov_base = DNS_PACKET_DATA(p);
iov.iov_len = p->allocated;
+ mh.msg_name = &sa.sa;
+ mh.msg_namelen = sizeof(sa);
mh.msg_iov = &iov;
mh.msg_iovlen = 1;
+ mh.msg_control = &control;
+ mh.msg_controllen = sizeof(control);
l = recvmsg(fd, &mh, 0);
if (l < 0) {
if (l <= 0)
return -EIO;
+ assert(!(mh.msg_flags & MSG_CTRUNC));
+ assert(!(mh.msg_flags & MSG_TRUNC));
+
p->size = (size_t) l;
- *ret = p;
- p = NULL;
+ p->family = sa.sa.sa_family;
+ if (p->family == AF_INET)
+ p->sender.in = sa.in.sin_addr;
+ else if (p->family == AF_INET6)
+ p->sender.in6 = sa.in6.sin6_addr;
+ else
+ return -EAFNOSUPPORT;
- return 1;
-}
+ for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg)) {
-int manager_dns_ipv6_recv(Manager *m, DnsPacket **ret) {
- _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
- struct msghdr mh = {};
- struct iovec iov;
- int fd, ms = 0, r;
- ssize_t l;
+ if (cmsg->cmsg_level == IPPROTO_IPV6) {
+ assert(p->family == AF_INET6);
- assert(m);
- assert(ret);
+ switch (cmsg->cmsg_type) {
- fd = manager_dns_ipv6_fd(m);
- if (fd < 0)
- return fd;
+ case IPV6_PKTINFO: {
+ struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
- r = ioctl(fd, FIONREAD, &ms);
- if (r < 0)
- return -errno;
- if (ms < 0)
- return -EIO;
+ p->ifindex = i->ipi6_ifindex;
+ p->destination.in6 = i->ipi6_addr;
+ break;
+ }
- r = dns_packet_new(&p, ms);
- if (r < 0)
- return r;
+ case IPV6_HOPLIMIT:
+ p->ttl = *(int *) CMSG_DATA(cmsg);
+ break;
- iov.iov_base = DNS_PACKET_DATA(p);
- iov.iov_len = p->allocated;
+ }
+ } else if (cmsg->cmsg_level == IPPROTO_IP) {
+ assert(p->family == AF_INET);
- mh.msg_iov = &iov;
- mh.msg_iovlen = 1;
-
- l = recvmsg(fd, &mh, 0);
- if (l < 0) {
- if (errno == EAGAIN || errno == EINTR)
- return 0;
+ switch (cmsg->cmsg_type) {
- return -errno;
- }
+ case IP_PKTINFO: {
+ struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
- if (l <= 0)
- return -EIO;
+ p->ifindex = i->ipi_ifindex;
+ p->destination.in = i->ipi_addr;
+ break;
+ }
- p->size = (size_t) l;
+ case IP_RECVTTL:
+ p->ttl = *(int *) CMSG_DATA(cmsg);
+ break;
+ }
+ }
+ }
*ret = p;
p = NULL;
return 1;
}
-static int on_dns_ipv4_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+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;
int r;
- r = manager_dns_ipv4_recv(m, &p);
+ r = manager_recv(m, fd, DNS_PROTOCOL_DNS, &p);
if (r <= 0)
return r;
- t = hashmap_get(m->dns_query_transactions, UINT_TO_PTR(DNS_PACKET_ID(p)));
- if (!t)
- return 0;
-
- dns_query_transaction_reply(t, p);
- return 0;
-}
-
-static int on_dns_ipv6_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_dns_ipv6_recv(m, &p);
- if (r <= 0)
- return r;
+ if (dns_packet_validate_reply(p) >= 0) {
+ t = hashmap_get(m->dns_query_transactions, UINT_TO_PTR(DNS_PACKET_ID(p)));
+ if (!t)
+ return 0;
- t = hashmap_get(m->dns_query_transactions, UINT_TO_PTR(DNS_PACKET_ID(p)));
- if (!t)
- return 0;
+ dns_query_transaction_reply(t, p);
+ } else
+ log_debug("Invalid reply packet.");
- dns_query_transaction_reply(t, p);
return 0;
}
int manager_dns_ipv4_fd(Manager *m) {
+ const int one = 1;
int r;
assert(m);
if (m->dns_ipv4_fd < 0)
return -errno;
- r = sd_event_add_io(m->event, &m->dns_ipv4_event_source, m->dns_ipv4_fd, EPOLLIN, on_dns_ipv4_packet, m);
+ 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)
- return r;
+ 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 -errno;
- r = sd_event_add_io(m->event, &m->dns_ipv6_event_source, m->dns_ipv6_fd, EPOLLIN, on_dns_ipv6_packet, m);
+ 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)
- return r;
+ 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 manager_dns_ipv4_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p) {
+static int manager_ipv4_send(Manager *m, int fd, int ifindex, struct in_addr *addr, uint16_t port, DnsPacket *p) {
union sockaddr_union sa = {
.in.sin_family = AF_INET,
- .in.sin_port = htobe16(53),
};
+ union {
+ struct cmsghdr header; /* For alignment */
+ uint8_t buffer[CMSG_SPACE(sizeof(struct in_pktinfo))];
+ } control;
struct msghdr mh = {};
struct iovec iov;
- uint8_t control[CMSG_SPACE(sizeof(struct in_pktinfo))];
- int fd;
assert(m);
- assert(srv);
+ assert(fd >= 0);
+ assert(addr);
+ assert(port > 0);
assert(p);
- fd = manager_dns_ipv4_fd(m);
- if (fd < 0)
- return fd;
-
iov.iov_base = DNS_PACKET_DATA(p);
iov.iov_len = p->size;
- sa.in.sin_addr = srv->address.in;
+ sa.in.sin_addr = *addr;
+ sa.in.sin_port = htobe16(port),
mh.msg_iov = &iov;
mh.msg_iovlen = 1;
zero(control);
- mh.msg_control = control;
+ mh.msg_control = &control;
mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo));
cmsg = CMSG_FIRSTHDR(&mh);
return sendmsg_loop(fd, &mh, 0);
}
-int manager_dns_ipv6_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p) {
+static int manager_ipv6_send(Manager *m, int fd, int ifindex, struct in6_addr *addr, uint16_t port, DnsPacket *p) {
union sockaddr_union sa = {
.in6.sin6_family = AF_INET6,
- .in6.sin6_port = htobe16(53),
};
-
+ union {
+ struct cmsghdr header; /* For alignment */
+ uint8_t buffer[CMSG_SPACE(sizeof(struct in6_pktinfo))];
+ } control;
struct msghdr mh = {};
struct iovec iov;
- uint8_t control[CMSG_SPACE(sizeof(struct in6_pktinfo))];
- int fd;
assert(m);
- assert(srv);
+ assert(fd >= 0);
+ assert(addr);
+ assert(port > 0);
assert(p);
- fd = manager_dns_ipv6_fd(m);
- if (fd < 0)
- return fd;
-
iov.iov_base = DNS_PACKET_DATA(p);
iov.iov_len = p->size;
- sa.in6.sin6_addr = srv->address.in6;
+ sa.in6.sin6_addr = *addr;
+ sa.in6.sin6_port = htobe16(port),
sa.in6.sin6_scope_id = ifindex;
mh.msg_iov = &iov;
zero(control);
- mh.msg_control = control;
+ mh.msg_control = &control;
mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo));
cmsg = CMSG_FIRSTHDR(&mh);
return sendmsg_loop(fd, &mh, 0);
}
+int manager_send(Manager *m, int fd, int ifindex, unsigned char family, union in_addr_union *addr, uint16_t port, DnsPacket *p) {
+ assert(m);
+ assert(fd >= 0);
+ assert(addr);
+ assert(port > 0);
+ assert(p);
+
+ 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, unsigned char family, union in_addr_union *in_addr) {
DnsServer *s;
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) {
+ t = hashmap_get(m->dns_query_transactions, UINT_TO_PTR(DNS_PACKET_ID(p)));
+ if (!t)
+ return 0;
+
+ dns_query_transaction_reply(t, p);
+ }
+
+ 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;
+ 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;
+
+ r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_TTL, &one, sizeof(one));
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MULTICAST_TTL, &one, sizeof(one));
+ 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;
+ 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, &one, sizeof(one));
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &one, sizeof(one));
+ 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;
+}
struct Manager {
sd_event *event;
- /* network */
+ bool use_llmnr:1;
+
+ /* Network */
Hashmap *links;
sd_rtnl *rtnl;
sd_network_monitor *network_monitor;
sd_event_source *network_event_source;
- /* unicast dns */
+ /* DNS query management */
+ Hashmap *dns_query_transactions;
+ LIST_HEAD(DnsQuery, dns_queries);
+ unsigned n_dns_queries;
+
+ /* Unicast dns */
int dns_ipv4_fd;
int dns_ipv6_fd;
sd_event_source *dns_ipv4_event_source;
sd_event_source *dns_ipv6_event_source;
- Hashmap *dns_query_transactions;
- LIST_HEAD(DnsQuery, dns_queries);
- unsigned n_dns_queries;
-
LIST_HEAD(DnsServer, dns_servers);
DnsServer *current_dns_server;
LIST_HEAD(DnsScope, dns_scopes);
DnsScope *unicast_scope;
+ /* LLMNR */
+ int llmnr_ipv4_udp_fd;
+ int llmnr_ipv6_udp_fd;
+ /* int llmnr_ipv4_tcp_fd; */
+ /* int llmnr_ipv6_tcp_fd; */
+
+ sd_event_source *llmnr_ipv4_udp_event_source;
+ sd_event_source *llmnr_ipv6_udp_event_source;
+
/* dbus */
sd_bus *bus;
sd_event_source *bus_retry_event_source;
void manager_next_dns_server(Manager *m);
uint32_t manager_find_mtu(Manager *m);
-int manager_dns_ipv4_fd(Manager *m);
-int manager_dns_ipv4_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p);
-int manager_dns_ipv4_recv(Manager *m, DnsPacket **ret);
+int manager_send(Manager *m, int fd, int ifindex, unsigned char family, union in_addr_union *addr, uint16_t port, DnsPacket *p);
+int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret);
+int manager_dns_ipv4_fd(Manager *m);
int manager_dns_ipv6_fd(Manager *m);
-int manager_dns_ipv6_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p);
-int manager_dns_ipv6_recv(Manager *m, DnsPacket **ret);
+int manager_llmnr_ipv4_udp_fd(Manager *m);
+int manager_llmnr_ipv6_udp_fd(Manager *m);
int manager_connect_bus(Manager *m);
return -EINVAL;
}
+
+static const char* const family_table[] = {
+ [AF_UNSPEC] = "unspec",
+ [AF_UNIX] = "unix",
+ [AF_INET] = "inet",
+ [AF_INET6] = "inet6",
+ [AF_NETLINK] = "netlink",
+ [AF_PACKET] = "packet",
+ [AF_BLUETOOTH] = "bluetooth",
+ [AF_NFC] = "nfc",
+};
+DEFINE_STRING_TABLE_LOOKUP(family, int);
assert(family == AF_INET || family == AF_INET6);
return family == AF_INET6 ? 16 : 4;
}
+
+const char* family_to_string(int i) _const_;
+int family_from_string(const char *s) _pure_;
~ianmdlvl / elogind.git / commitdiff