int manager_add_dns_server_by_string(Manager *m, DnsServerType type, const char *word) {
union in_addr_union address;
int family, r, ifindex = 0;
DnsServer *s;
assert(m);
assert(word);
r = in_addr_ifindex_from_string_auto(word, &family, &address, &ifindex);
if (r < 0)
return r;
/* Filter out duplicates */
s = dns_server_find(manager_get_first_dns_server(m, type), family, &address, ifindex);
if (s) {
/*
* Drop the marker. This is used to find the servers
* that ceased to exist, see
* manager_mark_dns_servers() and
* manager_flush_marked_dns_servers().
*/
dns_server_move_back_and_unmark(s);
return 0;
}
return dns_server_new(m, NULL, type, NULL, family, &address, ifindex);
}
static int link_update_dns_servers(Link *l) {
_cleanup_strv_free_ char **nameservers = NULL;
char **nameserver;
int r;
assert(l);
r = sd_network_link_get_dns(l->ifindex, &nameservers);
if (r == -ENODATA) {
r = 0;
goto clear;
}
if (r < 0)
goto clear;
dns_server_mark_all(l->dns_servers);
STRV_FOREACH(nameserver, nameservers) {
union in_addr_union a;
DnsServer *s;
int family;
r = in_addr_from_string_auto(*nameserver, &family, &a);
if (r < 0)
goto clear;
s = dns_server_find(l->dns_servers, family, &a);
if (s)
dns_server_move_back_and_unmark(s);
else {
r = dns_server_new(l->manager, NULL, DNS_SERVER_LINK, l, family, &a);
if (r < 0)
goto clear;
}
}
dns_server_unlink_marked(l->dns_servers);
return 0;
clear:
dns_server_unlink_all(l->dns_servers);
return r;
}
static int link_update_dns_server_one(Link *l, const char *name) {
union in_addr_union a;
DnsServer *s;
int family, r;
assert(l);
assert(name);
r = in_addr_from_string_auto(name, &family, &a);
if (r < 0)
return r;
s = dns_server_find(l->dns_servers, family, &a, 0);
if (s) {
dns_server_move_back_and_unmark(s);
return 0;
}
return dns_server_new(l->manager, NULL, DNS_SERVER_LINK, l, family, &a, 0);
}