+ ret = make_message(
+ "status: %s\n"
+ "port: %s\n"
+ "number of connected clients: %d\n"
+ "maximal number of clients: %d%s\n"
+ "connected clients: %s\n"
+ "access %s list: %s\n",
+ (ss->listen_fd >= 0)? "on" : "off",
+ stringify_port(ss->port, strcmp(name, "http") ? "dccp" : "tcp"),
+ ss->num_clients,
+ ss->max_clients,
+ ss->max_clients > 0? "" : " (unlimited)",
+ clnts? clnts : "(none)",
+ ss->default_deny? "allow" : "deny",
+ acl_contents? acl_contents : "(empty)"
+ );
+ free(acl_contents);
+ free(clnts);
+ return ret;
+}
+
+/**
+ * Allow connections from the given range of IP addresses.
+ *
+ * \param scd Contains the IP and the netmask.
+ * \param ss The sender.
+ *
+ * \sa generic_com_deny().
+ */
+void generic_com_allow(struct sender_command_data *scd,
+ struct sender_status *ss)
+{
+ acl_allow(scd->host, scd->netmask, &ss->acl, ss->default_deny);
+}
+
+/**
+ * Deny connections from the given range of IP addresses.
+ *
+ * \param scd see \ref generic_com_allow().
+ * \param ss see \ref generic_com_allow().
+ *
+ * \sa generic_com_allow().
+ */
+void generic_com_deny(struct sender_command_data *scd,
+ struct sender_status *ss)
+{
+ acl_deny(scd->host, scd->netmask, &ss->acl, ss->default_deny);
+}
+
+/**
+ * Activate a paraslash sender.
+ *
+ * \param ss The sender to activate.
+ * \param protocol The symbolic name of the transport-layer protocol.
+ *
+ * \return Standard.
+ */
+int generic_com_on(struct sender_status *ss, unsigned protocol)
+{
+ int ret;
+
+ if (ss->listen_fd >= 0)
+ return 1;
+ ret = open_sender(protocol, ss->port);
+ if (ret < 0)
+ return ret;
+ ss->listen_fd = ret;
+ return 1;
+}
+
+/**
+ * Deactivate a paraslash sender.
+ *
+ * Shutdown all connected clients and stop listening on the TCP/DCCP socket.
+ *
+ * \param ss The sender to deactivate.
+ *
+ * \sa \ref del_close_on_fork_list(), shutdown_clients().
+ */
+void generic_com_off(struct sender_status *ss)
+{
+ if (ss->listen_fd < 0)
+ return;
+ PARA_NOTICE_LOG("closing port %d\n", ss->port);
+ close(ss->listen_fd);
+ del_close_on_fork_list(ss->listen_fd);
+ shutdown_clients(ss);
+ ss->listen_fd = -1;
+}
+
+/**
+ * Accept a connection on the socket this server is listening on.
+ *
+ * \param ss The sender whose listening fd is ready for reading.
+ * \param rfds Passed to para_accept(),
+ *
+ * This must be called only if the socket fd of \a ss is ready for reading. It
+ * calls para_accept() to accept the connection and performs the following
+ * actions on the resulting file descriptor \a fd:
+ *
+ * - Checks whether the maximal number of connections are exceeded.
+ * - Sets \a fd to nonblocking mode.
+ * - Checks the acl of the sender to find out whether connections
+ * are allowed from the IP of the connecting peer.
+ * - Increases the number of connections for this sender.
+ * - Creates and initializes a new chunk queue for queuing network
+ * packets that can not be sent immediately.
+ * - Allocates a new struct sender_client and fills in its \a fd, \a cq
+ * and \a name members.
+ * - Adds \a fd to the list of connected clients for this sender.
+ * - Adds \a fd to the list of file descriptors that should be closed
+ * in the child process when the server calls fork().
+ *
+ * \return A pointer to the allocated sender_client structure on success, \p
+ * NULL on errors.
+ *
+ * \sa \ref para_accept(), \ref mark_fd_nonblocking(), \ref acl_check_access(),
+ * \ref cq_new(), \ref add_close_on_fork_list().
+ */
+struct sender_client *accept_sender_client(struct sender_status *ss, fd_set *rfds)
+{
+ struct sender_client *sc;
+ int fd, ret;
+
+ if (ss->listen_fd < 0)
+ return NULL;
+ ret = para_accept(ss->listen_fd, rfds, NULL, 0, &fd);
+ if (ret < 0)
+ PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+ if (ret <= 0)
+ return NULL;
+ ret = -E_MAX_CLIENTS;
+ if (ss->max_clients > 0 && ss->num_clients >= ss->max_clients)
+ goto err_out;
+ ret = mark_fd_nonblocking(fd);
+ if (ret < 0)
+ goto err_out;
+ ret = acl_check_access(fd, &ss->acl, ss->default_deny);
+ if (ret < 0)
+ goto err_out;
+ ss->num_clients++;
+ sc = para_calloc(sizeof(*sc));
+ sc->fd = fd;
+ sc->name = para_strdup(remote_name(fd));
+ sc->cq = cq_new(MAX_CQ_BYTES);
+ para_list_add(&sc->node, &ss->client_list);
+ add_close_on_fork_list(fd);
+ PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", ss->num_clients,
+ sc->name, fd);
+ return sc;
+err_out:
+ PARA_WARNING_LOG("%s\n", para_strerror(-ret));
+ close(fd);
+ return NULL;
+}
+
+/**
+ * Get the generic help text.
+ *
+ * \return A dynamically allocated string containing the help text for
+ * a paraslash sender.
+ */
+char *generic_sender_help(void)
+{
+ return make_message(
+ "usage: {on|off}\n"
+ "usage: {allow|deny} IP[/netmask]\n"
+ " where mask defaults to 32\n"
+ "example: allow 192.168.0.1/24\n"
+ );
+}
+
+static int parse_fec_parms(const char *arg, struct sender_command_data *scd)
+{
+ int32_t val;
+ char *a = para_strdup(arg),
+ *b = strchr(a, ':'),
+ *c = strrchr(a, ':');
+ int ret = -E_COMMAND_SYNTAX;
+
+ if (!b || !c)