+ host = calloc(1, sizeof(*host));
+ if (host == NULL)
+ goto out_nomem;
+
+ /*
+ * mon_name and my_name are preserved so sm-notify can
+ * find the right monitor record to remove when it is
+ * done processing this host.
+ */
+ host->name = strdup(hostname);
+ host->mon_name = (const char *)strdup(mon_name);
+ host->my_name = (const char *)strdup(my_name);
+ host->notify_arg = strdup(opt_srcaddr != NULL ?
+ nsm_hostname : my_name);
+ if (host->name == NULL ||
+ host->mon_name == NULL ||
+ host->my_name == NULL ||
+ host->notify_arg == NULL) {
+ free(host->notify_arg);
+ free((void *)host->my_name);
+ free((void *)host->mon_name);
+ free(host->name);
+ free(host);
+ goto out_nomem;
+ }
+
+ host->last_used = timestamp;
+ host->timeout = NSM_TIMEOUT;
+ host->retries = 100; /* force address retry */
+
+ return host;
+
+out_nomem:
+ xlog_warn("Unable to allocate memory");
+ return NULL;
+}
+
+static void smn_forget_host(struct nsm_host *host)
+{
+ xlog(D_CALL, "Removing %s (%s, %s) from notify list",
+ host->name, host->mon_name, host->my_name);
+
+ nsm_delete_notified_host(host->name, host->mon_name, host->my_name);
+
+ free(host->notify_arg);
+ free((void *)host->my_name);
+ free((void *)host->mon_name);
+ free(host->name);
+ if (host->ai)
+ freeaddrinfo(host->ai);
+
+ free(host);
+}
+
+static unsigned int
+smn_get_host(const char *hostname,
+ __attribute__ ((unused)) const struct sockaddr *sap,
+ const struct mon *m, const time_t timestamp)
+{
+ struct nsm_host *host;
+
+ host = smn_alloc_host(hostname,
+ m->mon_id.mon_name, m->mon_id.my_id.my_name, timestamp);
+ if (host == NULL)
+ return 0;
+
+ insert_host(host);
+ return 1;
+}
+
+#ifdef IPV6_SUPPORTED
+static int smn_socket(void)
+{
+ int sock;
+
+ /*
+ * Use an AF_INET socket if IPv6 is disabled on the
+ * local system.
+ */
+ sock = socket(AF_INET6, SOCK_DGRAM, 0);
+ if (sock == -1) {
+ if (errno != EAFNOSUPPORT) {
+ xlog(L_ERROR, "Failed to create RPC socket: %m");
+ return -1;
+ }
+ sock = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock < 0) {
+ xlog(L_ERROR, "Failed to create RPC socket: %m");
+ return -1;
+ }
+ } else
+ nsm_family = AF_INET6;
+
+ if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) {
+ xlog(L_ERROR, "fcntl(3) on RPC socket failed: %m");
+ goto out_close;
+ }
+
+ /*
+ * TI-RPC over IPv6 (udp6/tcp6) does not handle IPv4. However,
+ * since sm-notify open-codes all of its RPC support, it can
+ * use a single socket and let the local network stack provide
+ * the correct mapping between address families automatically.
+ * This is the same thing that is done in the kernel.
+ */
+ if (nsm_family == AF_INET6) {
+ const int zero = 0;
+ socklen_t zerolen = (socklen_t)sizeof(zero);
+
+ if (setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
+ (char *)&zero, zerolen) == -1) {
+ xlog(L_ERROR, "setsockopt(3) on RPC socket failed: %m");
+ goto out_close;
+ }
+ }
+
+ return sock;
+
+out_close:
+ (void)close(sock);
+ return -1;
+}
+#else /* !IPV6_SUPPORTED */
+static int smn_socket(void)
+{
+ int sock;
+
+ sock = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock == -1) {
+ xlog(L_ERROR, "Failed to create RPC socket: %m");
+ return -1;
+ }
+
+ if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) {
+ xlog(L_ERROR, "fcntl(3) on RPC socket failed: %m");
+ (void)close(sock);
+ return -1;
+ }
+
+ return sock;
+}
+#endif /* !IPV6_SUPPORTED */
+
+/*
+ * If admin specified a source address or srcport, then convert those
+ * to a sockaddr and return it. Otherwise, return an ANYADDR address.
+ */
+__attribute_malloc__
+static struct addrinfo *
+smn_bind_address(const char *srcaddr, const char *srcport)
+{
+ struct addrinfo *ai = NULL;
+ struct addrinfo hint = {
+ .ai_flags = AI_NUMERICSERV,
+ .ai_family = nsm_family,
+ .ai_protocol = (int)IPPROTO_UDP,
+ };
+ int error;
+
+ if (srcaddr == NULL)
+ hint.ai_flags |= AI_PASSIVE;
+
+ /* Do not allow "node" and "service" parameters both to be NULL */
+ if (srcport == NULL)
+ error = getaddrinfo(srcaddr, "", &hint, &ai);
+ else
+ error = getaddrinfo(srcaddr, srcport, &hint, &ai);
+ if (error != 0) {
+ xlog(L_ERROR,
+ "Invalid bind address or port for RPC socket: %s",
+ gai_strerror(error));