+/* Open one or more sockets for incoming data using the specified type,
+ * port, and address.
+ *
+ * The getaddrinfo() call may return several address results, e.g. for
+ * the machine's IPv4 and IPv6 name.
+ *
+ * We return an array of file-descriptors to the sockets, with a trailing
+ * -1 value to indicate the end of the list.
+ *
+ * bind_addr: local address to bind, or NULL to allow it to default. */
+static int *open_socket_in(int type, int port, const char *bind_addr,
+ int af_hint)
+{
+ int one = 1;
+ int s, *socks, maxs, i, ecnt;
+ struct addrinfo hints, *all_ai, *resp;
+ char portbuf[10], **errmsgs;
+ int error;
+
+ memset(&hints, 0, sizeof hints);
+ hints.ai_family = af_hint;
+ hints.ai_socktype = type;
+ hints.ai_flags = AI_PASSIVE;
+ snprintf(portbuf, sizeof portbuf, "%d", port);
+ error = getaddrinfo(bind_addr, portbuf, &hints, &all_ai);
+ if (error) {
+ rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n",
+ bind_addr, gai_strerror(error));
+ return NULL;
+ }
+
+ /* Count max number of sockets we might open. */
+ for (maxs = 0, resp = all_ai; resp; resp = resp->ai_next, maxs++) {}
+
+ socks = new_array(int, maxs + 1);
+ errmsgs = new_array(char *, maxs);
+ if (!socks || !errmsgs)
+ out_of_memory("open_socket_in");
+
+ /* We may not be able to create the socket, if for example the
+ * machine knows about IPv6 in the C library, but not in the
+ * kernel. */
+ for (resp = all_ai, i = ecnt = 0; resp; resp = resp->ai_next) {
+ s = socket(resp->ai_family, resp->ai_socktype,
+ resp->ai_protocol);
+
+ if (s == -1) {
+ int r = asprintf(&errmsgs[ecnt++],
+ "socket(%d,%d,%d) failed: %s\n",
+ (int)resp->ai_family, (int)resp->ai_socktype,
+ (int)resp->ai_protocol, strerror(errno));
+ if (r < 0)
+ out_of_memory("open_socket_in");
+ /* See if there's another address that will work... */
+ continue;