#include <arpa/inet.h>
#include <resolv.h>
#include <linux/if.h>
+#include <sys/ioctl.h>
+#include <sys/poll.h>
+#include <netinet/in.h>
-#include "resolved.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 "resolved.h"
+
+#define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
+
+static int manager_process_link(sd_rtnl *rtnl, sd_rtnl_message *mm, void *userdata) {
+ Manager *m = userdata;
+ uint16_t type;
+ Link *l;
+ int ifindex, r;
+
+ assert(rtnl);
+ assert(m);
+ assert(mm);
+
+ r = sd_rtnl_message_get_type(mm, &type);
+ if (r < 0)
+ goto fail;
+
+ r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
+ if (r < 0)
+ goto fail;
+
+ l = hashmap_get(m->links, INT_TO_PTR(ifindex));
+
+ switch (type) {
+
+ case RTM_NEWLINK:
+ if (!l) {
+ log_debug("Found link %i", ifindex);
+
+ r = link_new(m, &l, ifindex);
+ if (r < 0)
+ goto fail;
+ }
+
+ r = link_update_rtnl(l, mm);
+ if (r < 0)
+ goto fail;
+
+ break;
+
+ case RTM_DELLINK:
+ if (l) {
+ log_debug("Removing link %i", l->ifindex);
+ link_free(l);
+ }
+
+ break;
+ }
+
+ return 0;
+
+fail:
+ log_warning("Failed to process RTNL link message: %s", strerror(-r));
+ return 0;
+}
+
+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;
+ LinkAddress *a;
+ Link *l;
+
+ assert(rtnl);
+ assert(mm);
+ assert(m);
+
+ r = sd_rtnl_message_get_type(mm, &type);
+ if (r < 0)
+ goto fail;
+
+ r = sd_rtnl_message_addr_get_ifindex(mm, &ifindex);
+ if (r < 0)
+ goto fail;
+
+ l = hashmap_get(m->links, INT_TO_PTR(ifindex));
+ if (!l)
+ return 0;
+
+ r = sd_rtnl_message_addr_get_family(mm, &family);
+ if (r < 0)
+ goto fail;
+
+ switch (family) {
+
+ case AF_INET:
+ r = sd_rtnl_message_read_in_addr(mm, IFA_LOCAL, &address.in);
+ if (r < 0) {
+ r = sd_rtnl_message_read_in_addr(mm, IFA_ADDRESS, &address.in);
+ if (r < 0)
+ goto fail;
+ }
+
+ break;
+
+ case AF_INET6:
+ r = sd_rtnl_message_read_in6_addr(mm, IFA_LOCAL, &address.in6);
+ if (r < 0) {
+ r = sd_rtnl_message_read_in6_addr(mm, IFA_ADDRESS, &address.in6);
+ if (r < 0)
+ goto fail;
+ }
+
+ break;
+
+ default:
+ return 0;
+ }
+
+ a = link_find_address(l, family, &address);
+
+ switch (type) {
+
+ case RTM_NEWADDR:
+
+ if (!a) {
+ r = link_address_new(l, &a, family, &address);
+ if (r < 0)
+ return r;
+ }
+
+ r = link_address_update_rtnl(a, mm);
+ if (r < 0)
+ return r;
+
+ break;
+
+ case RTM_DELADDR:
+ if (a)
+ link_address_free(a);
+ break;
+ }
+
+ return 0;
+
+fail:
+ log_warning("Failed to process RTNL address message: %s", strerror(-r));
+ return 0;
+}
+
+
+static int manager_rtnl_listen(Manager *m) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
+ sd_rtnl_message *i;
+ int r;
+
+ assert(m);
+
+ /* First, subscibe to interfaces coming and going */
+ r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_attach_event(m->rtnl, m->event, 0);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m);
+ if (r < 0)
+ return r;
-static int set_fallback_dns(Manager *m, const char *string) {
+ /* Then, enumerate all links */
+ r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_message_request_dump(req, true);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_call(m->rtnl, req, 0, &reply);
+ if (r < 0)
+ return r;
+
+ for (i = reply; i; i = sd_rtnl_message_next(i)) {
+ r = manager_process_link(m->rtnl, i, m);
+ if (r < 0)
+ return r;
+ }
+
+ req = sd_rtnl_message_unref(req);
+ reply = sd_rtnl_message_unref(reply);
+
+ /* Finally, enumerate all addresses, too */
+ r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_message_request_dump(req, true);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_call(m->rtnl, req, 0, &reply);
+ if (r < 0)
+ return r;
+
+ for (i = reply; i; i = sd_rtnl_message_next(i)) {
+ r = manager_process_address(m->rtnl, i, m);
+ if (r < 0)
+ return r;
+ }
+
+ return r;
+}
+
+static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+ Manager *m = userdata;
+ Iterator i;
+ Link *l;
+ int r;
+
+ assert(m);
+
+ sd_network_monitor_flush(m->network_monitor);
+
+ HASHMAP_FOREACH(l, m->links, i) {
+ r = link_update_monitor(l);
+ if (r < 0)
+ log_warning("Failed to update monitor information for %i: %s", l->ifindex, strerror(-r));
+ }
+
+ r = manager_write_resolv_conf(m);
+ if (r < 0)
+ log_warning("Could not update resolv.conf: %s", strerror(-r));
+
+ return 0;
+}
+
+static int manager_network_monitor_listen(Manager *m) {
+ int r, fd, events;
+
+ assert(m);
+
+ r = sd_network_monitor_new(&m->network_monitor, NULL);
+ if (r < 0)
+ return r;
+
+ fd = sd_network_monitor_get_fd(m->network_monitor);
+ if (fd < 0)
+ return fd;
+
+ events = sd_network_monitor_get_events(m->network_monitor);
+ if (events < 0)
+ return events;
+
+ r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static int parse_dns_server_string(Manager *m, const char *string) {
char *word, *state;
size_t length;
int r;
assert(string);
FOREACH_WORD_QUOTED(word, length, string, state) {
- _cleanup_free_ Address *address = NULL;
- Address *tail;
- _cleanup_free_ char *addrstr = NULL;
-
- address = new0(Address, 1);
- if (!address)
- return -ENOMEM;
+ char buffer[length+1];
+ unsigned family;
+ union in_addr_union addr;
- addrstr = strndup(word, length);
- if (!addrstr)
- return -ENOMEM;
+ memcpy(buffer, word, length);
+ buffer[length] = 0;
- r = net_parse_inaddr(addrstr, &address->family, &address->in_addr);
+ r = in_addr_from_string_auto(buffer, &family, &addr);
if (r < 0) {
- log_debug("Ignoring invalid DNS address '%s'", addrstr);
+ log_warning("Ignoring invalid DNS address '%s'", buffer);
continue;
}
- LIST_FIND_TAIL(addresses, m->fallback_dns, tail);
- LIST_INSERT_AFTER(addresses, m->fallback_dns, tail, address);
- address = NULL;
+ /* filter out duplicates */
+ if (manager_find_dns_server(m, family, &addr))
+ continue;
+
+ r = dns_server_new(m, NULL, DNS_SERVER_SYSTEM, NULL, family, &addr);
+ if (r < 0)
+ return r;
}
return 0;
void *userdata) {
Manager *m = userdata;
- Address *address;
+ int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(m);
- while ((address = m->fallback_dns)) {
- LIST_REMOVE(addresses, m->fallback_dns, address);
- free(address);
+ /* Empty assignment means clear the list */
+ if (isempty(rvalue)) {
+ while (m->dns_servers)
+ dns_server_free(m->dns_servers);
+
+ return 0;
}
- set_fallback_dns(m, rvalue);
+ r = parse_dns_server_string(m, rvalue);
+ if (r < 0) {
+ log_error("Failed to parse DNS server string");
+ return r;
+ }
return 0;
}
-static int manager_parse_config_file(Manager *m) {
- int r;
-
+int manager_parse_config_file(Manager *m) {
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 r;
+ 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) {
- _cleanup_manager_free_ Manager *m = NULL;
+ _cleanup_(manager_freep) Manager *m = NULL;
int r;
+ assert(ret);
+
m = new0(Manager, 1);
if (!m)
return -ENOMEM;
- r = set_fallback_dns(m, DNS_SERVERS);
- if (r < 0)
- return r;
+ m->dns_ipv4_fd = m->dns_ipv6_fd = -1;
- r = manager_parse_config_file(m);
+ r = parse_dns_server_string(m, /* "172.31.0.125 2001:4860:4860::8888 2001:4860:4860::8889" */ DNS_SERVERS);
if (r < 0)
return r;
sd_event_set_watchdog(m->event, true);
+ r = dns_scope_new(m, &m->unicast_scope, DNS_SCOPE_DNS);
+ if (r < 0)
+ return r;
+
+ r = manager_network_monitor_listen(m);
+ if (r < 0)
+ return r;
+
+ r = manager_rtnl_listen(m);
+ if (r < 0)
+ return r;
+
+ r = manager_connect_bus(m);
+ if (r < 0)
+ return r;
+
*ret = m;
m = NULL;
return 0;
}
-void manager_free(Manager *m) {
- Address *address;
+Manager *manager_free(Manager *m) {
+ Link *l;
if (!m)
- return;
+ return NULL;
- sd_event_unref(m->event);
+ while (m->dns_queries)
+ dns_query_free(m->dns_queries);
- while ((address = m->fallback_dns)) {
- LIST_REMOVE(addresses, m->fallback_dns, address);
- free(address);
- }
+ hashmap_free(m->dns_query_transactions);
+
+ while ((l = hashmap_first(m->links)))
+ link_free(l);
+ hashmap_free(m->links);
+
+ dns_scope_free(m->unicast_scope);
+
+ while (m->dns_servers)
+ dns_server_free(m->dns_servers);
+
+ sd_event_source_unref(m->network_event_source);
+ sd_network_monitor_unref(m->network_monitor);
+
+ 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->bus_retry_event_source);
+ sd_bus_unref(m->bus);
+
+ sd_event_unref(m->event);
free(m);
+
+ return NULL;
}
-static void append_dns(FILE *f, void *dns, unsigned char family, unsigned *count) {
- char buf[INET6_ADDRSTRLEN];
- const char *address;
+static void write_resolve_conf_server(DnsServer *s, FILE *f, unsigned *count) {
+ _cleanup_free_ char *t = NULL;
+ int r;
+ assert(s);
assert(f);
- assert(dns);
assert(count);
- address = inet_ntop(family, dns, buf, INET6_ADDRSTRLEN);
- if (!address) {
+ r = in_addr_to_string(s->family, &s->address, &t);
+ if (r < 0) {
log_warning("Invalid DNS address. Ignoring.");
return;
}
if (*count == MAXNS)
- fputs("# Too many DNS servers configured, the following entries "
- "may be ignored\n", f);
-
- fprintf(f, "nameserver %s\n", address);
+ fputs("# Too many DNS servers configured, the following entries may be ignored\n", f);
+ fprintf(f, "nameserver %s\n", t);
(*count) ++;
}
-int manager_update_resolv_conf(Manager *m) {
+int manager_write_resolv_conf(Manager *m) {
const char *path = "/run/systemd/resolve/resolv.conf";
_cleanup_free_ char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
- _cleanup_free_ unsigned *indices = NULL;
- Address *address;
unsigned count = 0;
- int n, r, i;
+ DnsServer *s;
+ Iterator i;
+ Link *l;
+ int r;
assert(m);
"# resolv.conf(5) in a different way, replace the symlink by a\n"
"# static file or a different symlink.\n\n", f);
- n = sd_network_get_ifindices(&indices);
- if (n < 0)
- n = 0;
-
- for (i = 0; i < n; i++) {
- _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
- struct in_addr *nameservers;
- struct in6_addr *nameservers6;
- size_t nameservers_size;
-
- r = sd_network_dhcp_use_dns(indices[i]);
- if (r > 0) {
- r = sd_network_get_dhcp_lease(indices[i], &lease);
- if (r >= 0) {
- r = sd_dhcp_lease_get_dns(lease, &nameservers, &nameservers_size);
- if (r >= 0) {
- unsigned j;
-
- for (j = 0; j < nameservers_size; j++)
- append_dns(f, &nameservers[j], AF_INET, &count);
- }
- }
- }
+ HASHMAP_FOREACH(l, m->links, i) {
+ LIST_FOREACH(servers, s, l->link_dns_servers)
+ write_resolve_conf_server(s, f, &count);
- r = sd_network_get_dns(indices[i], &nameservers, &nameservers_size);
- if (r >= 0) {
- unsigned j;
+ LIST_FOREACH(servers, s, l->dhcp_dns_servers)
+ write_resolve_conf_server(s, f, &count);
+ }
- for (j = 0; j < nameservers_size; j++)
- append_dns(f, &nameservers[j], AF_INET, &count);
+ LIST_FOREACH(servers, s, m->dns_servers)
+ write_resolve_conf_server(s, f, &count);
- free(nameservers);
- }
+ r = fflush_and_check(f);
+ if (r < 0)
+ goto fail;
- r = sd_network_get_dns6(indices[i], &nameservers6, &nameservers_size);
- if (r >= 0) {
- unsigned j;
+ if (rename(temp_path, path) < 0) {
+ r = -errno;
+ goto fail;
+ }
- for (j = 0; j < nameservers_size; j++)
- append_dns(f, &nameservers6[j], AF_INET6, &count);
+ return 0;
- free(nameservers6);
- }
+fail:
+ unlink(path);
+ unlink(temp_path);
+ return r;
+}
+
+int manager_dns_ipv4_recv(Manager *m, DnsPacket **ret) {
+ _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
+ struct msghdr mh = {};
+ int fd, ms = 0, r;
+ struct iovec iov;
+ ssize_t l;
+
+ assert(m);
+ 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);
+ if (r < 0)
+ return r;
+
+ iov.iov_base = DNS_PACKET_DATA(p);
+ iov.iov_len = p->allocated;
+
+ mh.msg_iov = &iov;
+ mh.msg_iovlen = 1;
+
+ l = recvmsg(fd, &mh, 0);
+ if (l < 0) {
+ if (errno == EAGAIN || errno == EINTR)
+ return 0;
+
+ return -errno;
}
- LIST_FOREACH(addresses, address, m->fallback_dns)
- append_dns(f, &address->in_addr, address->family, &count);
+ if (l <= 0)
+ return -EIO;
- fflush(f);
+ p->size = (size_t) l;
- if (ferror(f) || rename(temp_path, path) < 0) {
- r = -errno;
- unlink(path);
- unlink(temp_path);
+ *ret = p;
+ p = NULL;
+
+ return 1;
+}
+
+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;
+
+ assert(m);
+ assert(ret);
+
+ fd = manager_dns_ipv6_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);
+ if (r < 0)
return r;
+
+ iov.iov_base = DNS_PACKET_DATA(p);
+ iov.iov_len = p->allocated;
+
+ mh.msg_iov = &iov;
+ mh.msg_iovlen = 1;
+
+ l = recvmsg(fd, &mh, 0);
+ if (l < 0) {
+ if (errno == EAGAIN || errno == EINTR)
+ return 0;
+
+ return -errno;
}
+ if (l <= 0)
+ return -EIO;
+
+ p->size = (size_t) l;
+
+ *ret = p;
+ p = NULL;
+
+ return 1;
+}
+
+static int on_dns_ipv4_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);
+ 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 manager_network_event_handler(sd_event_source *s, int fd, uint32_t revents,
- void *userdata) {
+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;
+
+ 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_dns_ipv4_fd(Manager *m) {
+ int r;
+
assert(m);
- r = manager_update_resolv_conf(m);
- if (r < 0)
- log_warning("Could not update resolv.conf: %s", strerror(-r));
+ if (m->dns_ipv4_fd >= 0)
+ return m->dns_ipv4_fd;
- sd_network_monitor_flush(m->network_monitor);
+ m->dns_ipv4_fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
+ if (m->dns_ipv4_fd < 0)
+ return -errno;
- return 0;
+ r = sd_event_add_io(m->event, &m->dns_ipv4_event_source, m->dns_ipv4_fd, EPOLLIN, on_dns_ipv4_packet, m);
+ if (r < 0)
+ return r;
+
+ return m->dns_ipv4_fd;
}
-int manager_network_monitor_listen(Manager *m) {
- _cleanup_event_source_unref_ sd_event_source *event_source = NULL;
- _cleanup_network_monitor_unref_ sd_network_monitor *monitor = NULL;
- int r, fd, events;
+int manager_dns_ipv6_fd(Manager *m) {
+ int r;
+
+ assert(m);
+
+ if (m->dns_ipv6_fd >= 0)
+ return m->dns_ipv6_fd;
- r = sd_network_monitor_new(NULL, &monitor);
+ m->dns_ipv6_fd = socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
+ 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);
if (r < 0)
return r;
- fd = sd_network_monitor_get_fd(monitor);
+ return m->dns_ipv6_fd;
+}
+
+static int sendmsg_loop(int fd, struct msghdr *mh, int flags) {
+ int r;
+
+ assert(fd >= 0);
+ assert(mh);
+
+ for (;;) {
+ if (sendmsg(fd, mh, flags) >= 0)
+ return 0;
+
+ if (errno == EINTR)
+ continue;
+
+ if (errno != EAGAIN)
+ return -errno;
+
+ r = fd_wait_for_event(fd, POLLOUT, SEND_TIMEOUT_USEC);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -ETIMEDOUT;
+ }
+}
+
+int manager_dns_ipv4_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p) {
+ union sockaddr_union sa = {
+ .in.sin_family = AF_INET,
+ .in.sin_port = htobe16(53),
+ };
+ struct msghdr mh = {};
+ struct iovec iov;
+ uint8_t control[CMSG_SPACE(sizeof(struct in_pktinfo))];
+ int fd;
+
+ assert(m);
+ assert(srv);
+ assert(p);
+
+ fd = manager_dns_ipv4_fd(m);
if (fd < 0)
return fd;
- events = sd_network_monitor_get_events(monitor);
- if (events < 0)
- return events;
+ iov.iov_base = DNS_PACKET_DATA(p);
+ iov.iov_len = p->size;
- r = sd_event_add_io(m->event, &event_source, fd, events,
- &manager_network_event_handler, m);
- if (r < 0)
- return r;
+ sa.in.sin_addr = srv->address.in;
- m->network_monitor = monitor;
- m->network_event_source = event_source;
- monitor = NULL;
- event_source = NULL;
+ mh.msg_iov = &iov;
+ mh.msg_iovlen = 1;
+ mh.msg_name = &sa.sa;
+ mh.msg_namelen = sizeof(sa.in);
- return 0;
+ if (ifindex > 0) {
+ struct cmsghdr *cmsg;
+ struct in_pktinfo *pi;
+
+ zero(control);
+
+ mh.msg_control = control;
+ mh.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo));
+
+ cmsg = CMSG_FIRSTHDR(&mh);
+ cmsg->cmsg_len = mh.msg_controllen;
+ cmsg->cmsg_level = IPPROTO_IP;
+ cmsg->cmsg_type = IP_PKTINFO;
+
+ pi = (struct in_pktinfo*) CMSG_DATA(cmsg);
+ pi->ipi_ifindex = ifindex;
+ }
+
+ return sendmsg_loop(fd, &mh, 0);
+}
+
+int manager_dns_ipv6_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p) {
+ union sockaddr_union sa = {
+ .in6.sin6_family = AF_INET6,
+ .in6.sin6_port = htobe16(53),
+ };
+
+ struct msghdr mh = {};
+ struct iovec iov;
+ uint8_t control[CMSG_SPACE(sizeof(struct in6_pktinfo))];
+ int fd;
+
+ assert(m);
+ assert(srv);
+ 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_scope_id = ifindex;
+
+ mh.msg_iov = &iov;
+ mh.msg_iovlen = 1;
+ mh.msg_name = &sa.sa;
+ mh.msg_namelen = sizeof(sa.in6);
+
+ if (ifindex > 0) {
+ struct cmsghdr *cmsg;
+ struct in6_pktinfo *pi;
+
+ zero(control);
+
+ mh.msg_control = control;
+ mh.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo));
+
+ cmsg = CMSG_FIRSTHDR(&mh);
+ cmsg->cmsg_len = mh.msg_controllen;
+ cmsg->cmsg_level = IPPROTO_IPV6;
+ cmsg->cmsg_type = IPV6_PKTINFO;
+
+ pi = (struct in6_pktinfo*) CMSG_DATA(cmsg);
+ pi->ipi6_ifindex = ifindex;
+ }
+
+ return sendmsg_loop(fd, &mh, 0);
+}
+
+DnsServer* manager_find_dns_server(Manager *m, unsigned char family, union in_addr_union *in_addr) {
+ DnsServer *s;
+
+ assert(m);
+ assert(in_addr);
+
+ LIST_FOREACH(servers, s, m->dns_servers) {
+
+ if (s->family == family &&
+ in_addr_equal(family, &s->address, in_addr))
+ return s;
+ }
+
+ return NULL;
+}
+
+DnsServer *manager_get_dns_server(Manager *m) {
+ assert(m);
+
+ if (!m->current_dns_server)
+ m->current_dns_server = m->dns_servers;
+
+ return m->current_dns_server;
+}
+
+void manager_next_dns_server(Manager *m) {
+ assert(m);
+
+ if (!m->current_dns_server) {
+ m->current_dns_server = m->dns_servers;
+ return;
+ }
+
+ if (!m->current_dns_server)
+ return;
+
+ if (m->current_dns_server->servers_next) {
+ m->current_dns_server = m->current_dns_server->servers_next;
+ return;
+ }
+
+ 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;
}
~ianmdlvl / elogind.git / blobdiff