Added a 'loadaddr' command, to get the address that a node is supposed to use

to load its disk image. The reloads table is used to determine which image the
node is supposed to load. The appropriate address is then pulled from the
load_addres field of the images table.

This done in preparation for frisbee support.

tmcd/tmcd.c

@@ -63,6 +63,7 @@ static int doready(int sock, struct in_addr ipaddr, char *rdata,int tcp);
 static int doreadycount(int sock, struct in_addr ipaddr,char *rdata,int tcp);
 static int dolog(int sock, struct in_addr ipaddr,char *rdata,int tcp);
 static int domounts(int sock, struct in_addr ipaddr,char *rdata,int tcp);
+static int doloadaddr(int sock, struct in_addr ipaddr,char *rdata,int tcp);
 
 struct command {
 	char	*cmdname;
@@ -84,6 +85,7 @@ struct command {
 	{ "ready",	doready },
 	{ "log",	dolog },
 	{ "mounts",	domounts },
+	{ "loadaddr",	doloadaddr},
 };
 static int numcommands = sizeof(command_array)/sizeof(struct command);
 
@@ -1633,6 +1635,70 @@ domounts(int sock, struct in_addr ipaddr, char *rdata, int tcp)
 	return 0;
 }
 
+/*
+ * Return address from which to load an image
+ */
+static int
+doloadaddr(int sock, struct in_addr ipaddr, char *rdata, int tcp)
+{
+	MYSQL_RES	*res;	
+	MYSQL_ROW	row;
+	char		nodeid[32];
+	char		pid[64];
+	char		eid[64];
+	char		buf[MYBUFSIZE], *bp, *sp;
+
+	if (iptonodeid(ipaddr, nodeid)) {
+		syslog(LOG_ERR, "doloadaddr: %s: No such node",
+		       inet_ntoa(ipaddr));
+		return 1;
+	}
+
+	/*
+	 * Now check reserved table
+	 */
+	if (nodeidtoexp(nodeid, pid, eid))
+		return 0;
+
+	/*
+	 * Get the address the node should contact to load its image
+	 */
+	res = mydb_query("select load_address from images as i "
+			"left join reloads as r on i.imageid = r.image_id "
+			"where node_id='%s'",
+			 1, nodeid);
+
+	if (!res) {
+		syslog(LOG_ERR, "doloadaddr: %s: DB Error getting "
+		       "loading address!",
+		       nodeid);
+		return 1;
+	}
+
+	if ((int)mysql_num_rows(res) == 0) {
+		mysql_free_result(res);
+		return 0;
+	}
+
+	/*
+	 * Simple text string.
+	 */
+	row = mysql_fetch_row(res);
+	if (! row[0] || !row[0][0]) {
+		mysql_free_result(res);
+		return 0;
+	}
+	sprintf(buf, "ADDR=%s\n", row[0]);
+	mysql_free_result(res);
+
+	client_writeback(sock, buf, strlen(buf), tcp);
+	syslog(LOG_INFO, "doloadaddr: %s", buf);
+	
+	return 0;
+}
+
+
+
 /*
  * DB stuff
  */