kike: better debug messages

I had a wonderful "I'm a fucking idiot" moment when I tried connecting
over SSL/TLS with no certificate at the server.

By the way, ZyklonB crashes with FreeBSD 10's Valgrind and gdb
seemingly loses track of execution while in getaddrinfo().

kike.c

@@ -316,6 +316,7 @@ struct client
 	char *realname;                     ///< IRC realname (e-mail)
 
 	char *hostname;                     ///< Hostname shown to the network
+	char *address;                      ///< Full address including port
 
 	unsigned mode;                      ///< User's mode
 	char *away_message;                 ///< Away message
@@ -351,6 +352,7 @@ client_free (struct client *self)
 	free (self->realname);
 
 	free (self->hostname);
+	free (self->address);
 	free (self->away_message);
 	flood_detector_free (&self->antiflood);
 }
@@ -775,6 +777,10 @@ client_kill (struct client *c, const char *reason)
 	if (c->ssl)
 		(void) SSL_shutdown (c->ssl);
 	xclose (c->socket_fd);
+
+	print_debug ("closed connection to %s (%s)",
+		c->address, reason ? reason : "Reason omitted");
+
 	c->socket_fd = -1;
 	client_free (c);
 	LIST_UNLINK (ctx->clients, c);
@@ -2541,16 +2547,19 @@ start:
 static bool
 client_initialize_ssl (struct client *c)
 {
-	// SSL support not enabled
+	const char *error_info = NULL;
 	if (!c->ctx->ssl_ctx)
-		return false;
+	{
+		error_info = "SSL support disabled";
+		goto error_ssl_1;
+	}
 
 	c->ssl = SSL_new (c->ctx->ssl_ctx);
 	if (!c->ssl)
 		goto error_ssl_1;
-
 	if (!SSL_set_fd (c->ssl, c->socket_fd))
 		goto error_ssl_2;
+
 	SSL_set_accept_state (c->ssl);
 	return true;
 
@@ -2560,8 +2569,9 @@ error_ssl_2:
 error_ssl_1:
 	// XXX: these error strings are really nasty; also there could be
 	//   multiple errors on the OpenSSL stack.
-	print_debug ("%s: %s: %s", "could not initialize SSL",
-		c->hostname, ERR_error_string (ERR_get_error (), NULL));
+	if (!error_info)
+		error_info = ERR_error_string (ERR_get_error (), NULL);
+	print_debug ("could not initialize SSL for %s: %s", c->address, error_info);
 	return false;
 }
 
@@ -2664,13 +2674,13 @@ on_irc_client_available (const struct pollfd *pfd, void *user_data)
 
 		char *address = format_host_port_pair (host, port);
 		print_debug ("accepted connection from %s", address);
-		free (address);
 
 		struct client *c = xmalloc (sizeof *c);
 		client_init (c);
 		c->ctx = ctx;
 		c->socket_fd = fd;
 		c->hostname = xstrdup (host);
+		c->address = address;
 		c->last_active = time (NULL);
 		LIST_PREPEND (ctx->clients, c);
 		ctx->n_clients++;