ServerName *server_name_free(ServerName *n) {
if (!n)
return NULL;
server_name_flush_addresses(n);
if (n->manager) {
if (n->type == SERVER_SYSTEM)
LIST_REMOVE(names, n->manager->system_servers, n);
else if (n->type == SERVER_LINK)
LIST_REMOVE(names, n->manager->link_servers, n);
else if (n->type == SERVER_FALLBACK)
LIST_REMOVE(names, n->manager->fallback_servers, n);
else
assert_not_reached("Unknown server type");
if (n->manager->current_server_name == n)
manager_set_server_name(n->manager, NULL);
}
log_debug("Removed server %s.", n->string);
free(n->string);
return mfree(n);
}
int server_name_new(
Manager *m,
ServerName **ret,
ServerType type,
const char *string) {
ServerName *n, *tail;
assert(m);
assert(string);
n = new0(ServerName, 1);
if (!n)
return -ENOMEM;
n->type = type;
n->string = strdup(string);
if (!n->string) {
free(n);
return -ENOMEM;
}
if (type == SERVER_SYSTEM) {
LIST_FIND_TAIL(names, m->system_servers, tail);
LIST_INSERT_AFTER(names, m->system_servers, tail, n);
} else if (type == SERVER_LINK) {
LIST_FIND_TAIL(names, m->link_servers, tail);
LIST_INSERT_AFTER(names, m->link_servers, tail, n);
} else if (type == SERVER_FALLBACK) {
LIST_FIND_TAIL(names, m->fallback_servers, tail);
LIST_INSERT_AFTER(names, m->fallback_servers, tail, n);
} else
assert_not_reached("Unknown server type");
n->manager = m;
if (type != SERVER_FALLBACK &&
m->current_server_name &&
m->current_server_name->type == SERVER_FALLBACK)
manager_set_server_name(m, NULL);
log_debug("Added new server %s.", string);
if (ret)
*ret = n;
return 0;
}
int manager_connect(Manager *m) {
int r;
assert(m);
manager_disconnect(m);
m->event_retry = sd_event_source_unref(m->event_retry);
if (!ratelimit_test(&m->ratelimit)) {
log_debug("Slowing down attempts to contact servers.");
r = sd_event_add_time(m->event, &m->event_retry, clock_boottime_or_monotonic(), now(clock_boottime_or_monotonic()) + RETRY_USEC, 0, manager_retry_connect, m);
if (r < 0) {
log_error("Failed to create retry timer: %s", strerror(-r));
return r;
}
return 0;
}
/* If we already are operating on some address, switch to the
* next one. */
if (m->current_server_address && m->current_server_address->addresses_next)
manager_set_server_address(m, m->current_server_address->addresses_next);
else {
struct addrinfo hints = {
.ai_flags = AI_NUMERICSERV|AI_ADDRCONFIG,
.ai_socktype = SOCK_DGRAM,
};
/* Hmm, we are through all addresses, let's look for the next host instead */
if (m->current_server_name && m->current_server_name->names_next)
manager_set_server_name(m, m->current_server_name->names_next);
else {
ServerName *f;
/* Our current server name list is exhausted,
* let's find the next one to iterate. First
* we try the system list, then the link list.
* After having processed the link list we
* jump back to the system list. However, if
* both lists are empty, we change to the
* fallback list. */
if (!m->current_server_name || m->current_server_name->type == SERVER_LINK) {
f = m->system_servers;
if (!f)
f = m->link_servers;
} else {
f = m->link_servers;
if (!f)
f = m->system_servers;
}
if (!f)
f = m->fallback_servers;
if (!f) {
manager_set_server_name(m, NULL);
log_debug("No server found.");
return 0;
}
manager_set_server_name(m, f);
}
/* Tell the resolver to reread /etc/resolv.conf, in
* case it changed. */
res_init();
/* Flush out any previously resolved addresses */
server_name_flush_addresses(m->current_server_name);
log_debug("Resolving %s...", m->current_server_name->string);
r = sd_resolve_getaddrinfo(m->resolve, &m->resolve_query, m->current_server_name->string, "123", &hints, manager_resolve_handler, m);
if (r < 0) {
log_error("Failed to create resolver: %s", strerror(-r));
return r;
}
return 1;
}
r = manager_begin(m);
if (r < 0)
return r;
return 1;
}
void manager_disconnect(Manager *m) {
assert(m);
m->resolve_query = sd_resolve_query_unref(m->resolve_query);
m->event_timer = sd_event_source_unref(m->event_timer);
m->event_receive = sd_event_source_unref(m->event_receive);
m->server_socket = safe_close(m->server_socket);
m->event_clock_watch = sd_event_source_unref(m->event_clock_watch);
m->clock_watch_fd = safe_close(m->clock_watch_fd);
m->event_timeout = sd_event_source_unref(m->event_timeout);
sd_notifyf(false, "STATUS=Idle.");
}