#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>
#include "rtnl-util.h"
#include "event-util.h"
#include "network-util.h"
-#include "sd-dhcp-lease.h"
-#include "dhcp-lease-internal.h"
#include "network-internal.h"
#include "conf-parser.h"
#include "socket-util.h"
+#include "af-list.h"
#include "resolved.h"
#define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
switch (type) {
- case RTM_NEWLINK:
- if (!l) {
- log_debug("Found link %i", ifindex);
+ case RTM_NEWLINK:{
+ bool is_new = !l;
+ if (!l) {
r = link_new(m, &l, ifindex);
if (r < 0)
goto fail;
if (r < 0)
goto fail;
+ if (is_new)
+ log_debug("Found new link %i/%s", ifindex, l->name);
+
break;
+ }
case RTM_DELLINK:
if (l) {
- log_debug("Removing link %i", l->ifindex);
+ log_debug("Removing link %i/%s", l->ifindex, l->name);
link_free(l);
}
static int manager_process_address(sd_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) {
Manager *m = userdata;
union in_addr_union address;
- unsigned char family;
uint16_t type;
- int r, ifindex;
+ int r, ifindex, family;
LinkAddress *a;
Link *l;
assert(m);
- r = sd_network_monitor_new(NULL, &m->network_monitor);
+ r = sd_network_monitor_new(&m->network_monitor, NULL);
if (r < 0)
return r;
FOREACH_WORD_QUOTED(word, length, string, state) {
char buffer[length+1];
- unsigned family;
+ int family;
union in_addr_union addr;
memcpy(buffer, word, length);
if (manager_find_dns_server(m, family, &addr))
continue;
- r = dns_server_new(m, NULL, DNS_SERVER_SYSTEM, NULL, family, &addr);
+ r = dns_server_new(m, NULL, NULL, family, &addr);
if (r < 0)
return r;
}
}
int manager_parse_config_file(Manager *m) {
- int r;
-
assert(m);
- r = config_parse(NULL,
- "/etc/systemd/resolved.conf", NULL,
- "Resolve\0",
- config_item_perf_lookup, (void*) resolved_gperf_lookup,
- false, false, m);
- if (r < 0)
- log_warning("Failed to parse configuration file: %s", strerror(-r));
-
- return 0;
+ return config_parse(NULL, "/etc/systemd/resolved.conf", NULL,
+ "Resolve\0",
+ config_item_perf_lookup, resolved_gperf_lookup,
+ false, false, true, m);
}
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->llmnr_ipv4_tcp_fd = m->llmnr_ipv6_tcp_fd = -1;
- r = parse_dns_server_string(m, /* "172.31.0.125 2001:4860:4860::8888 2001:4860:4860::8889" */ DNS_SERVERS);
+ 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;
+
r = sd_event_default(&m->event);
if (r < 0)
return r;
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;
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;
+
*ret = m;
m = NULL;
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->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);
+
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;
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;
}
"# resolv.conf(5) in a different way, replace the symlink by a\n"
"# static file or a different symlink.\n\n", f);
- HASHMAP_FOREACH(l, m->links, i) {
- LIST_FOREACH(servers, s, l->link_dns_servers)
+ HASHMAP_FOREACH(l, m->links, i)
+ LIST_FOREACH(servers, s, l->dns_servers)
write_resolve_conf_server(s, f, &count);
- LIST_FOREACH(servers, s, l->dhcp_dns_servers)
- write_resolve_conf_server(s, f, &count);
- }
-
LIST_FOREACH(servers, s, m->dns_servers)
write_resolve_conf_server(s, f, &count);
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 */
+ + EXTRA_CMSG_SPACE /* 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 (errno == EAGAIN)
+ if (errno == EAGAIN || errno == EINTR)
return 0;
return -errno;
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;
+ p->ipproto = IPPROTO_UDP;
+ if (p->family == AF_INET) {
+ p->sender.in = sa.in.sin_addr;
+ p->sender_port = be16toh(sa.in.sin_port);
+ } else if (p->family == AF_INET6) {
+ p->sender.in6 = sa.in6.sin6_addr;
+ p->sender_port = be16toh(sa.in6.sin6_port);
+ p->ifindex = sa.in6.sin6_scope_id;
+ } 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;
+ if (p->ifindex <= 0)
+ p->ifindex = i->ipi6_ifindex;
- r = dns_packet_new(&p, ms);
- if (r < 0)
- return r;
+ p->destination.in6 = i->ipi6_addr;
+ break;
+ }
- iov.iov_base = DNS_PACKET_DATA(p);
- iov.iov_len = p->allocated;
+ case IPV6_HOPLIMIT:
+ p->ttl = *(int *) CMSG_DATA(cmsg);
+ break;
- mh.msg_iov = &iov;
- mh.msg_iovlen = 1;
+ }
+ } else if (cmsg->cmsg_level == IPPROTO_IP) {
+ assert(p->family == AF_INET);
- l = recvmsg(fd, &mh, 0);
- if (l < 0) {
- if (errno == EAGAIN)
- return 0;
+ switch (cmsg->cmsg_type) {
- return -errno;
+ case IP_PKTINFO: {
+ struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
+
+ if (p->ifindex <= 0)
+ p->ifindex = i->ipi_ifindex;
+
+ p->destination.in = i->ipi_addr;
+ break;
+ }
+
+ case IP_TTL:
+ p->ttl = *(int *) CMSG_DATA(cmsg);
+ break;
+ }
+ }
}
- if (l <= 0)
- return -EIO;
+ /* The Linux kernel sets the interface index to the loopback
+ * 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)
+ p->ifindex = 0;
- p->size = (size_t) l;
+ /* 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_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_HEADER(p)->id));
- if (!t)
- return 0;
+ 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;
- return dns_query_transaction_reply(t, p);
-}
+ dns_query_transaction_process_reply(t, p);
-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;
+ } else
+ log_debug("Invalid DNS packet.");
- t = hashmap_get(m->dns_query_transactions, UINT_TO_PTR(DNS_PACKET_HEADER(p)->id));
- if (!t)
- return 0;
-
- return 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, const 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, const 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);
}
-DnsServer* manager_find_dns_server(Manager *m, unsigned char family, union in_addr_union *in_addr) {
+int manager_send(Manager *m, int fd, int ifindex, int family, const union in_addr_union *addr, uint16_t port, DnsPacket *p) {
+ assert(m);
+ assert(fd >= 0);
+ assert(addr);
+ assert(port > 0);
+ assert(p);
+
+ log_debug("Sending %s packet with id %u on interface %i/%s", DNS_PACKET_QR(p) ? "response" : "query", DNS_PACKET_ID(p), ifindex, af_to_name(family));
+
+ 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, int family, const union in_addr_union *in_addr) {
DnsServer *s;
assert(m);
m->current_dns_server = m->dns_servers;
}
+
+uint32_t manager_find_mtu(Manager *m) {
+ uint32_t mtu = 0;
+ Link *l;
+ Iterator i;
+
+ /* If we don't know on which link a DNS packet would be
+ * delivered, let's find the largest MTU that works on all
+ * interfaces we know of */
+
+ HASHMAP_FOREACH(l, m->links, i) {
+ if (l->mtu <= 0)
+ continue;
+
+ if (mtu <= 0 || l->mtu < mtu)
+ mtu = l->mtu;
+ }
+
+ 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;
+
+ if (p->family == AF_INET)
+ scope = l->llmnr_ipv4_scope;
+ else if (p->family == AF_INET6)
+ scope = l->llmnr_ipv6_scope;
+
+ if (scope)
+ dns_scope_process_query(scope, NULL, p);
+ }
+ } else
+ log_debug("Invalid LLMNR packet.");
+
+ 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;
+
+ 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;
+ }
+
+ 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, ttl = 255;
+ 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, &ttl, sizeof(ttl));
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ /* 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;
+ }
+
+ 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;
+}
+
+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;
+
+ cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
+ if (cfd < 0) {
+ if (errno == EAGAIN || errno == EINTR)
+ return 0;
+
+ return -errno;
+ }
+
+ r = dns_stream_new(m, &stream, DNS_PROTOCOL_LLMNR, cfd);
+ if (r < 0) {
+ safe_close(cfd);
+ return r;
+ }
+
+ stream->on_packet = on_llmnr_stream_packet;
+ return 0;
+}
+
+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;
+
+ assert(m);
+
+ 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;
+ }
+
+ r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one));
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ r = setsockopt(m->llmnr_ipv4_tcp_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_tcp_fd, IPPROTO_IP, IP_MTU_DISCOVER, &pmtu, sizeof(pmtu));
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ r = bind(m->llmnr_ipv4_tcp_fd, &sa.sa, sizeof(sa.in));
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ r = listen(m->llmnr_ipv4_tcp_fd, SOMAXCONN);
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ 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;
+
+ return m->llmnr_ipv4_tcp_fd;
+
+fail:
+ m->llmnr_ipv4_tcp_fd = safe_close(m->llmnr_ipv4_tcp_fd);
+ return r;
+}
+
+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 r;
+
+ assert(m);
+
+ 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;
+ }
+
+ 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;
+
+ 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;
+}
~ianmdlvl / elogind.git / blobdiff