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Diffstat (limited to 'src/resolve/resolved-dns-scope.c')
-rw-r--r--src/resolve/resolved-dns-scope.c85
1 files changed, 35 insertions, 50 deletions
diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c
index c25ac2216d..927a1ddc26 100644
--- a/src/resolve/resolved-dns-scope.c
+++ b/src/resolve/resolved-dns-scope.c
@@ -28,6 +28,7 @@
#include "random-util.h"
#include "hostname-util.h"
#include "dns-domain.h"
+#include "resolved-llmnr.h"
#include "resolved-dns-scope.h"
#define MULTICAST_RATELIMIT_INTERVAL_USEC (1*USEC_PER_SEC)
@@ -124,17 +125,17 @@ void dns_scope_next_dns_server(DnsScope *s) {
manager_next_dns_server(s->manager);
}
-int dns_scope_emit(DnsScope *s, DnsPacket *p) {
+int dns_scope_emit(DnsScope *s, int fd, DnsPacket *p) {
union in_addr_union addr;
int ifindex = 0, r;
int family;
uint16_t port;
uint32_t mtu;
- int fd;
assert(s);
assert(p);
assert(p->protocol == s->protocol);
+ assert((s->protocol == DNS_PROTOCOL_DNS) != (fd < 0));
if (s->link) {
mtu = s->link->mtu;
@@ -143,33 +144,18 @@ int dns_scope_emit(DnsScope *s, DnsPacket *p) {
mtu = manager_find_mtu(s->manager);
if (s->protocol == DNS_PROTOCOL_DNS) {
- DnsServer *srv;
-
if (DNS_PACKET_QDCOUNT(p) > 1)
return -EOPNOTSUPP;
- srv = dns_scope_get_dns_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)
+ if (p->size + UDP_PACKET_HEADER_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;
+ r = manager_write(s->manager, fd, p);
+ if (r < 0)
+ return r;
} else if (s->protocol == DNS_PROTOCOL_LLMNR) {
@@ -180,7 +166,7 @@ int dns_scope_emit(DnsScope *s, DnsPacket *p) {
return -EBUSY;
family = s->family;
- port = 5355;
+ port = LLMNR_PORT;
if (family == AF_INET) {
addr.in = LLMNR_MULTICAST_IPV4_ADDRESS;
@@ -192,17 +178,18 @@ int dns_scope_emit(DnsScope *s, DnsPacket *p) {
return -EAFNOSUPPORT;
if (fd < 0)
return fd;
+
+ r = manager_send(s->manager, fd, ifindex, family, &addr, port, p);
+ if (r < 0)
+ return r;
} else
return -EAFNOSUPPORT;
- r = manager_send(s->manager, fd, ifindex, family, &addr, port, p);
- if (r < 0)
- return r;
-
return 1;
}
-int dns_scope_tcp_socket(DnsScope *s, int family, const union in_addr_union *address, uint16_t port) {
+static int dns_scope_socket(DnsScope *s, int type, int family, const union in_addr_union *address, uint16_t port, DnsServer **server) {
+ DnsServer *srv = NULL;
_cleanup_close_ int fd = -1;
union sockaddr_union sa = {};
socklen_t salen;
@@ -213,8 +200,6 @@ int dns_scope_tcp_socket(DnsScope *s, int family, const union in_addr_union *add
assert((family == AF_UNSPEC) == !address);
if (family == AF_UNSPEC) {
- DnsServer *srv;
-
srv = dns_scope_get_dns_server(s);
if (!srv)
return -ESRCH;
@@ -247,13 +232,15 @@ int dns_scope_tcp_socket(DnsScope *s, int family, const union in_addr_union *add
return -EAFNOSUPPORT;
}
- fd = socket(sa.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
+ fd = socket(sa.sa.sa_family, type|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
if (fd < 0)
return -errno;
- r = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one));
- if (r < 0)
- return -errno;
+ if (type == SOCK_STREAM) {
+ 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);
@@ -287,12 +274,23 @@ int dns_scope_tcp_socket(DnsScope *s, int family, const union in_addr_union *add
if (r < 0 && errno != EINPROGRESS)
return -errno;
+ if (server)
+ *server = srv;
+
ret = fd;
fd = -1;
return ret;
}
+int dns_scope_udp_dns_socket(DnsScope *s, DnsServer **server) {
+ return dns_scope_socket(s, SOCK_DGRAM, AF_UNSPEC, NULL, 53, server);
+}
+
+int dns_scope_tcp_socket(DnsScope *s, int family, const union in_addr_union *address, uint16_t port, DnsServer **server) {
+ return dns_scope_socket(s, SOCK_STREAM, family, address, port, server);
+}
+
DnsScopeMatch dns_scope_good_domain(DnsScope *s, int ifindex, uint64_t flags, const char *domain) {
char **i;
@@ -415,19 +413,6 @@ 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,
@@ -546,7 +531,7 @@ void dns_scope_process_query(DnsScope *s, DnsStream *stream, DnsPacket *p) {
return;
}
- if (DNS_PACKET_C(p)) {
+ if (DNS_PACKET_LLMNR_C(p)) {
/* Somebody notified us about a possible conflict */
dns_scope_verify_conflicts(s, p);
return;
@@ -695,7 +680,7 @@ static int on_conflict_dispatch(sd_event_source *es, usec_t usec, void *userdata
return 0;
}
- r = dns_scope_emit(scope, p);
+ r = dns_scope_emit(scope, -1, p);
if (r < 0)
log_debug_errno(r, "Failed to send conflict packet: %m");
}
@@ -760,10 +745,10 @@ void dns_scope_check_conflicts(DnsScope *scope, DnsPacket *p) {
if (DNS_PACKET_RRCOUNT(p) <= 0)
return;
- if (DNS_PACKET_C(p) != 0)
+ if (DNS_PACKET_LLMNR_C(p) != 0)
return;
- if (DNS_PACKET_T(p) != 0)
+ if (DNS_PACKET_LLMNR_T(p) != 0)
return;
if (manager_our_packet(scope->manager, p))
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2025-02-10 21:42:53 +0000