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Diffstat (limited to 'src/resolve/resolved-dns-scope.c')
-rw-r--r--src/resolve/resolved-dns-scope.c213
1 files changed, 188 insertions, 25 deletions
diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c
index 96a2ff7fae..9a636b179c 100644
--- a/src/resolve/resolved-dns-scope.c
+++ b/src/resolve/resolved-dns-scope.c
@@ -21,6 +21,7 @@
#include <netinet/tcp.h>
+#include "missing.h"
#include "strv.h"
#include "socket-util.h"
#include "af-list.h"
@@ -77,6 +78,7 @@ DnsScope* dns_scope_free(DnsScope *s) {
}
dns_cache_flush(&s->cache);
+ dns_zone_flush(&s->zone);
LIST_REMOVE(scopes, s->manager->dns_scopes, s);
strv_free(s->domains);
@@ -130,6 +132,9 @@ int dns_scope_send(DnsScope *s, DnsPacket *p) {
if (s->protocol == DNS_PROTOCOL_DNS) {
DnsServer *srv;
+ if (DNS_PACKET_QDCOUNT(p) > 1)
+ return -ENOTSUP;
+
srv = dns_scope_get_server(s);
if (!srv)
return -ESRCH;
@@ -163,12 +168,10 @@ int dns_scope_send(DnsScope *s, DnsPacket *p) {
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)
@@ -183,39 +186,86 @@ int dns_scope_send(DnsScope *s, DnsPacket *p) {
return 1;
}
-int dns_scope_tcp_socket(DnsScope *s) {
+int dns_scope_tcp_socket(DnsScope *s, int family, const union in_addr_union *address, uint16_t port) {
_cleanup_close_ int fd = -1;
union sockaddr_union sa = {};
socklen_t salen;
- int one, ret;
- DnsServer *srv;
- int r;
+ static const int one = 1;
+ int ret, r;
assert(s);
+ assert((family == AF_UNSPEC) == !address);
- srv = dns_scope_get_server(s);
- if (!srv)
- return -ESRCH;
-
- sa.sa.sa_family = srv->family;
- if (srv->family == AF_INET) {
- sa.in.sin_port = htobe16(53);
- sa.in.sin_addr = srv->address.in;
- salen = sizeof(sa.in);
- } else if (srv->family == AF_INET6) {
- sa.in6.sin6_port = htobe16(53);
- sa.in6.sin6_addr = srv->address.in6;
- sa.in6.sin6_scope_id = s->link ? s->link->ifindex : 0;
- salen = sizeof(sa.in6);
- } else
- return -EAFNOSUPPORT;
+ if (family == AF_UNSPEC) {
+ DnsServer *srv;
+
+ srv = dns_scope_get_server(s);
+ if (!srv)
+ return -ESRCH;
+
+ sa.sa.sa_family = srv->family;
+ if (srv->family == AF_INET) {
+ sa.in.sin_port = htobe16(port);
+ sa.in.sin_addr = srv->address.in;
+ salen = sizeof(sa.in);
+ } else if (srv->family == AF_INET6) {
+ sa.in6.sin6_port = htobe16(port);
+ sa.in6.sin6_addr = srv->address.in6;
+ sa.in6.sin6_scope_id = s->link ? s->link->ifindex : 0;
+ salen = sizeof(sa.in6);
+ } else
+ return -EAFNOSUPPORT;
+ } else {
+ sa.sa.sa_family = family;
+
+ if (family == AF_INET) {
+ sa.in.sin_port = htobe16(port);
+ sa.in.sin_addr = address->in;
+ salen = sizeof(sa.in);
+ } else if (family == AF_INET6) {
+ sa.in6.sin6_port = htobe16(port);
+ sa.in6.sin6_addr = address->in6;
+ sa.in6.sin6_scope_id = s->link ? s->link->ifindex : 0;
+ salen = sizeof(sa.in6);
+ } else
+ return -EAFNOSUPPORT;
+ }
- fd = socket(srv->family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
+ fd = socket(sa.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
if (fd < 0)
return -errno;
- one = 1;
- setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one));
+ r = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one));
+ if (r < 0)
+ return -errno;
+
+ if (s->link) {
+ uint32_t ifindex = htobe32(s->link->ifindex);
+
+ if (sa.sa.sa_family == AF_INET) {
+ r = setsockopt(fd, IPPROTO_IP, IP_UNICAST_IF, &ifindex, sizeof(ifindex));
+ if (r < 0)
+ return -errno;
+ } else if (sa.sa.sa_family == AF_INET6) {
+ r = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_IF, &ifindex, sizeof(ifindex));
+ if (r < 0)
+ return -errno;
+ }
+ }
+
+ if (s->protocol == DNS_PROTOCOL_LLMNR) {
+ /* RFC 4795, section 2.5 suggests the TTL to be set to 1 */
+
+ if (sa.sa.sa_family == AF_INET) {
+ r = setsockopt(fd, IPPROTO_IP, IP_TTL, &one, sizeof(one));
+ if (r < 0)
+ return -errno;
+ } else if (sa.sa.sa_family == AF_INET6) {
+ r = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &one, sizeof(one));
+ if (r < 0)
+ return -errno;
+ }
+ }
r = connect(fd, &sa.sa, salen);
if (r < 0 && errno != EINPROGRESS)
@@ -223,6 +273,7 @@ int dns_scope_tcp_socket(DnsScope *s) {
ret = fd;
fd = -1;
+
return ret;
}
@@ -324,3 +375,115 @@ int dns_scope_llmnr_membership(DnsScope *s, bool b) {
return 0;
}
+
+int dns_scope_good_dns_server(DnsScope *s, int family, const union in_addr_union *address) {
+ assert(s);
+ assert(address);
+
+ if (s->protocol != DNS_PROTOCOL_DNS)
+ return 1;
+
+ if (s->link)
+ return !!link_find_dns_server(s->link, family, address);
+ else
+ return !!manager_find_dns_server(s->manager, family, address);
+}
+
+static int dns_scope_make_reply_packet(DnsScope *s, uint16_t id, int rcode, DnsQuestion *q, DnsAnswer *a, DnsPacket **ret) {
+ _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
+ unsigned i;
+ int r;
+
+ assert(s);
+
+ if (q->n_keys <= 0 && a->n_rrs <= 0)
+ return -EINVAL;
+
+ r = dns_packet_new(&p, s->protocol, 0);
+ if (r < 0)
+ return r;
+
+ DNS_PACKET_HEADER(p)->id = id;
+ DNS_PACKET_HEADER(p)->flags = htobe16(DNS_PACKET_MAKE_FLAGS(1, 0, 0, 0, 0, 0, 0, 0, rcode));
+
+ if (q) {
+ for (i = 0; i < q->n_keys; i++) {
+ r = dns_packet_append_key(p, q->keys[i], NULL);
+ if (r < 0)
+ return r;
+ }
+
+ DNS_PACKET_HEADER(p)->qdcount = htobe16(q->n_keys);
+ }
+
+ if (a) {
+ for (i = 0; i < a->n_rrs; i++) {
+ r = dns_packet_append_rr(p, a->rrs[i], NULL);
+ if (r < 0)
+ return r;
+ }
+
+ DNS_PACKET_HEADER(p)->ancount = htobe16(a->n_rrs);
+ }
+
+ *ret = p;
+ p = NULL;
+
+ return 0;
+}
+
+void dns_scope_process_query(DnsScope *s, DnsStream *stream, DnsPacket *p) {
+ _cleanup_(dns_packet_unrefp) DnsPacket *reply = NULL;
+ _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
+ int r, fd;
+
+ assert(s);
+ assert(p);
+
+ if (p->protocol != DNS_PROTOCOL_LLMNR)
+ return;
+
+ r = dns_packet_extract(p);
+ if (r < 0) {
+ log_debug("Failed to extract resources from incoming packet: %s", strerror(-r));
+ return;
+ }
+
+ r = dns_zone_lookup(&s->zone, p->question, &answer);
+ if (r < 0) {
+ log_debug("Failed to lookup key: %s", strerror(-r));
+ return;
+ }
+ if (r == 0)
+ return;
+
+ r = dns_scope_make_reply_packet(s, DNS_PACKET_ID(p), DNS_RCODE_SUCCESS, p->question, answer, &reply);
+ if (r < 0) {
+ log_debug("Failed to build reply packet: %s", strerror(-r));
+ return;
+ }
+
+ if (stream)
+ r = dns_stream_write_packet(stream, reply);
+ else {
+ if (p->family == AF_INET)
+ fd = manager_llmnr_ipv4_udp_fd(s->manager);
+ else if (p->family == AF_INET6)
+ fd = manager_llmnr_ipv6_udp_fd(s->manager);
+ else {
+ log_debug("Unknown protocol");
+ return;
+ }
+ if (fd < 0) {
+ log_debug("Failed to get reply socket: %s", strerror(-fd));
+ return;
+ }
+
+ r = manager_send(s->manager, fd, p->ifindex, p->family, &p->sender, p->sender_port, reply);
+ }
+
+ if (r < 0) {
+ log_debug("Failed to send reply packet: %s", strerror(-r));
+ return;
+ }
+}
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