node.c: Allow new node connections to be toggled on/off.

Add the "nodeconnects" CLI command, which allows new node
connections to be enabled/disabled. Useful if the sysop
wants to temporarily disable new node connections.

bbs/node.c

@@ -55,6 +55,7 @@
 #define DEFAULT_MAX_NODES 64
 
 static int shutting_down = 0;
+static int new_node_connects = 1; /* Whether new node connections are allowed */
 
 static RWLIST_HEAD_STATIC(nodes, bbs_node);
 
@@ -276,6 +277,9 @@ struct bbs_node *__bbs_node_request(int fd, const char *protname, struct sockadd
 		 * but before I/O modules are unloaded, bail now. */
 		bbs_warning("Declining node allocation due to active shutdown\n");
 		return NULL;
+	} else if (!new_node_connects) {
+		bbs_notice("Declining node allocation since new connections are currently disabled\n");
+		return NULL;
 	}
 
 	/* We want to allocate a node with the smallest node number available.
@@ -986,6 +990,14 @@ static int cli_kickall(struct bbs_cli_args *a)
 	return bbs_node_shutdown_all(0);
 }
 
+static int cli_nodeconnects(struct bbs_cli_args *a)
+{
+	int enabled = !bbs_falsy_value(a->argv[1]); /* Default to true if input is unrecognized */
+	bbs_dprintf(a->fdout, "New node connections were previously %s and are now %s\n", new_node_connects ? "enabled" : "disabled", enabled ? "enabled" : "disabled");
+	new_node_connects = enabled;
+	return 0;
+}
+
 static int node_info(int fd, unsigned int nodenum)
 {
 	char elapsed[24];
@@ -2368,6 +2380,7 @@ static struct bbs_cli_entry cli_commands_nodes[] = {
 	BBS_CLI_COMMAND(cli_interrupt, "interrupt", 2, "Interrupt specified node", "interrupt <nodenum>"),
 	BBS_CLI_COMMAND(cli_kick, "kick", 2, "Kick specified node", "kick <nodenum>"),
 	BBS_CLI_COMMAND(cli_kickall, "kickall", 1, "Kick all nodes", NULL),
+	BBS_CLI_COMMAND(cli_nodeconnects, "nodeconnects", 2, "Enable or disable node connects", "nodeconnects <enabled|disabled>"),
 	BBS_CLI_COMMAND(cli_spy, "spy", 2, "Spy on specified node (^C to stop)", "spy <nodenum>"),
 	BBS_CLI_COMMAND(cli_node_set_speed, "speed", 3, "Set emulated speed of specified node (0 = unthrottled)", "speed <nodenum> <bps>"),
 	/* User commands */

bbs/utils.c

@@ -128,6 +128,24 @@ int __attribute__ ((format (gnu_printf, 2, 3))) dyn_str_append_fmt(struct dyn_st
 	return len;
 }
 
+int bbs_truthy_value(const char *s)
+{
+	if (strlen_zero(s)) {
+		return 0;
+	}
+
+	return !strcasecmp(s, "1") || !strcasecmp(s, "yes") || !strcasecmp(s, "y") || !strcasecmp(s, "true") || !strcasecmp(s, "t") || !strcasecmp(s, "on") || !strcasecmp(s, "enabled");
+}
+
+int bbs_falsy_value(const char *s)
+{
+	if (strlen_zero(s)) {
+		return 0;
+	}
+
+	return !strcasecmp(s, "0") || !strcasecmp(s, "no") || !strcasecmp(s, "n") || !strcasecmp(s, "false") || !strcasecmp(s, "f") || !strcasecmp(s, "off") || !strcasecmp(s, "disabled");
+}
+
 int bbs_parse_url(struct bbs_url *url, char *restrict s)
 {
 	char *tmp;

include/utils.h

@@ -75,6 +75,12 @@ int __attribute__ ((format (gnu_printf, 2, 3))) dyn_str_append_fmt(struct dyn_st
  */
 #define dyn_str_len(dynstr) (dynstr->used)
 
+/*! \brief Whether s is a "truthy" value */
+int bbs_truthy_value(const char *s);
+
+/*! \brief Whether s is a "falsy" value */
+int bbs_falsy_value(const char *s);
+
 struct bbs_url {
 	const char *prot;
 	const char *user;