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path: root/src/resolve/resolved-manager.c
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Diffstat (limited to 'src/resolve/resolved-manager.c')
-rw-r--r--src/resolve/resolved-manager.c413
1 files changed, 315 insertions, 98 deletions
diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c
index fed9a77973..9f44bf1204 100644
--- a/src/resolve/resolved-manager.c
+++ b/src/resolve/resolved-manager.c
@@ -21,7 +21,7 @@
#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>
@@ -392,6 +392,9 @@ int manager_new(Manager **ret) {
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)
@@ -406,7 +409,7 @@ int manager_new(Manager **ret) {
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;
@@ -453,10 +456,14 @@ Manager *manager_free(Manager *m) {
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);
@@ -475,7 +482,7 @@ static void write_resolve_conf_server(DnsServer *s, FILE *f, unsigned *count) {
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;
}
@@ -539,35 +546,44 @@ fail:
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) {
@@ -580,56 +596,58 @@ int manager_dns_ipv4_recv(Manager *m, DnsPacket **ret) {
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;
@@ -637,43 +655,30 @@ int manager_dns_ipv6_recv(Manager *m, DnsPacket **ret) {
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);
@@ -685,14 +690,25 @@ int manager_dns_ipv4_fd(Manager *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);
@@ -704,11 +720,21 @@ int manager_dns_ipv6_fd(Manager *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) {
@@ -735,28 +761,28 @@ 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;
@@ -769,7 +795,7 @@ int manager_dns_ipv4_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p)
zero(control);
- mh.msg_control = control;
+ mh.msg_control = &control;
mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo));
cmsg = CMSG_FIRSTHDR(&mh);
@@ -784,29 +810,28 @@ int manager_dns_ipv4_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p)
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;
@@ -820,7 +845,7 @@ int manager_dns_ipv6_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p)
zero(control);
- mh.msg_control = control;
+ mh.msg_control = &control;
mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo));
cmsg = CMSG_FIRSTHDR(&mh);
@@ -835,6 +860,22 @@ int manager_dns_ipv6_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p)
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;
@@ -898,3 +939,179 @@ uint32_t manager_find_mtu(Manager *m) {
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;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-10 23:14:44 +0000