- I forgot to add new file to cvs repo during my last commit, I'm sorry

extern/verse/dist/vs_master.c

@@ -0,0 +1,131 @@
+/*
+ * Master server communication code.
+*/
+
+#include <stdio.h>
+#include <string.h>
+
+#include "verse.h"
+#include "v_util.h"
+#include "vs_server.h"
+
+#define	MASTER_SERVER_PERIOD	(60.0)	/* Period between ANNOUNCE to master server, in seconds. */
+
+static struct {
+	boolean		enabled;
+	boolean		started;
+	const char	*master;
+	char		desc[64];
+	const char	*tags;
+	VUtilTimer	timer;
+} server_info;
+
+#define	LEFT(d)	(sizeof server_info.desc - (d - server_info.desc) - 1)
+
+void vs_master_set_enabled(boolean enabled)
+{
+	server_info.enabled = enabled;
+}
+
+const char * vs_master_get_address(void)
+{
+	return server_info.master;
+}
+
+void vs_master_set_address(const char *address)
+{
+	server_info.master = address;
+}
+
+void vs_master_set_desc(const char *desc)
+{
+	const char	*src = desc;
+	char		*dst = server_info.desc;
+
+	for(; *src != '\0' && LEFT(dst) > 0;)
+	{
+		if(*src == '"')
+		{
+			if(LEFT(dst) < 2)
+				break;
+			*dst++ = '\\';
+		}
+		else if(*src == '\\')
+		{
+			if(LEFT(dst) < 2)
+				break;
+			*dst++ = '\\';
+		}
+		*dst++ = *src++;
+	}
+	*dst = '\0';
+}
+
+void vs_master_set_tags(const char *tags)
+{
+	server_info.tags = tags;	/* This needs more protection, instead of relying on the master server. */
+}
+
+void vs_master_update(void)
+{
+	if(!server_info.enabled || server_info.master == NULL)
+		return;
+
+	if(!server_info.started)
+	{
+		v_timer_start(&server_info.timer);
+		v_timer_advance(&server_info.timer, MASTER_SERVER_PERIOD);
+		server_info.started = TRUE;
+		return;
+	}
+	if(v_timer_elapsed(&server_info.timer) < MASTER_SERVER_PERIOD)
+		return;
+	verse_send_ping(server_info.master, "MS:ANNOUNCE");
+	v_timer_start(&server_info.timer);
+/*	printf("MS:ANNOUNCE sent to %s\n", server_info.master);*/
+}
+
+/* Check if a description request, of the form "A,B,C,...,D" includes the given keyword. This needs to
+ * do more than just a simple strstr(), since the keyword may be a prefix. Shades of OpenGL extensions.
+*/
+static int desc_has_keyword(const char *desc, const char *keyword)
+{
+	const char	*ptr;
+
+	if(desc == NULL || *desc == '\0')	/* Quick-check for empty description. */
+		return 0;
+
+	if((ptr = strstr(desc, keyword)) != NULL)
+	{
+		size_t	kl = strlen(keyword);
+
+		return ptr[kl] == ',' || ptr[kl] == '\0';
+	}
+	return 0;
+}
+
+static int keyword_fits(size_t used, size_t max, const char *key, const char *value)
+{
+	size_t	vsize = 0;
+
+	if(key != NULL && value != NULL)
+		vsize += 1 + strlen(key) + 1 + 1 + strlen(value) + 1;
+
+	return max - 1 - used >= vsize;
+}
+
+static char * append_desc(char *buf, const char *key, const char *value)
+{
+	return buf + sprintf(buf, " %s=\"%s\"", key, value);
+}
+
+void vs_master_handle_describe(const char *address, const char *message)
+{
+	char	desc[1380] = "DESCRIPTION", *put = desc + 11;
+
+	if(desc_has_keyword(message, "DE") && server_info.desc != NULL && keyword_fits(put - desc, sizeof desc, "DE", server_info.desc))
+		put = append_desc(put, "DE", server_info.desc);
+	if(desc_has_keyword(message, "TA") && server_info.tags != NULL && keyword_fits(put - desc, sizeof desc, "TA", server_info.tags))
+		put = append_desc(put, "TA", server_info.tags);
+	verse_send_ping(address, desc);
+}