Added namespace support for aggregating relays

conf/icecast.xml.in

@@ -118,6 +118,7 @@
         <port>8001</port>
         <username>relay</username>
         <password>hackme</password>
+        <namespace>master1</namespace>
         <on-demand>1</on-demand>
     </master>
     -->

doc/relaying.html

@@ -35,6 +35,9 @@ can be setup such that all that needs to be done is configure the slave server w
 will also periodically check the master server to see if any new mountpoints have attached and if so will relay those
 as well.  </p>
 
+  <p>This "master-slave" type relay has been extended to support aggregation so that multiple masters can be given
+and the slave will "aggregate" all of the mountpoints for those master servers. </p>
+
   <p>The second type of relay is a “single-broadcast” relay. In this case, the slave server is configured with a
 server IP, port and mount and only the mountpoint specified is relayed. In order to relay a broadcast stream on
 a Shoutcast server, you must use the “single-broadcast” relay and specify a mountpoint of <code>/</code>.</p>
@@ -61,6 +64,36 @@ be identical to those on the master server. </p>
 
 </div>
 
+<div class="article">
+  <h3 id="setting-up-a-master-slave-aggregating-relay">Setting Up a Master-Slave Aggregating Relay</h3>
+  <p>In order to setup a relay of this type all servers (the one you wish to relay and the one doing the relaying)
+need to be Icecast 2 servers. The following configuration snippet is used as an example:</p>
+
+  <div class="highlight"><pre><code class="language-xml" data-lang="xml"><span class="nt">&lt;master-update-interval&gt;</span>120<span class="nt">&lt;/master-update-interval&gt;</span>
+<span class="nt">&lt;master&gt;</span>
+    <span class="nt">&lt;server&gt;</span>192.168.1.11<span class="nt">&lt;/server&gt;</span>
+    <span class="nt">&lt;port&gt;</span>8001<span class="nt">&lt;/port&gt;</span>
+    <span class="nt">&lt;namespace&gt;</span>/upstream1<span class="nt">&lt;/namespace&gt;</span>
+    <span class="nt">&lt;password&gt;</span>hackme<span class="nt">&lt;/password&gt;</span>
+    <span class="nt">&lt;on-demand&gt;</span>1<span class="nt">&lt;/on-demand&gt;</span>
+<span class="nt">&lt;/master&gt;</span>
+<span class="nt">&lt;master&gt;</span>
+    <span class="nt">&lt;server&gt;</span>192.168.1.12<span class="nt">&lt;/server&gt;</span>
+    <span class="nt">&lt;port&gt;</span>8001<span class="nt">&lt;/port&gt;</span>
+    <span class="nt">&lt;password&gt;</span>hackme<span class="nt">&lt;/password&gt;</span>
+<span class="nt">&lt;/master&gt;</span>
+</code></pre></div>
+
+  <p>In this example, this configuration is setup in the server which will be doing the relaying (slave server).
+The master servers in this case need not be configured (and actually they are unaware of the relaying being performed)
+as relays. When the slave server is started, it will connect to each of the master servers located at 192.168.1.11:8001
+and 192.168.1.12:8001 and will begin to relay all mountpoints connected to the master servers. Additionally,
+every master-update-interval (120 seconds in this case) the slave server will poll the master servers to see if any new
+mountpoints have connected, and if so, the slave server will relay those as well. Note that all mountpoints of the master
+server at 192.168.1.11:8001 will have the namespace "/upstream1" prepended to it's mountpoints. </p>
+
+</div>
+
 <div class="article">
   <h3 id="setting-up-a-single-broadcast-relay">Setting Up a Single-Broadcast Relay</h3>
   <p>In this case, the master server need not be an Icecast 2 server. Supported master servers for a single-broadcast

src/cfgfile.c

@@ -1653,6 +1653,11 @@ static void _parse_master(xmlDocPtr      doc,
                 xmlFree(master->password);
             master->password = (char *)xmlNodeListGetString(doc, 
                 node->xmlChildrenNode, 1);
+        } else if (xmlStrcmp(node->name, XMLSTR("namespace")) == 0) {
+            if (master->namespace)
+                xmlFree(master->namespace);
+            master->namespace = (char *)xmlNodeListGetString(doc, 
+                node->xmlChildrenNode, 1);
         } else if (xmlStrcmp(node->name, XMLSTR("on-demand")) == 0) {
             tmp = (char *)xmlNodeListGetString(doc, node->xmlChildrenNode, 1);
             master->on_demand = util_str_to_bool(tmp);

src/slave.c

@@ -72,6 +72,8 @@ master_server *master_free (master_server *master)
         xmlFree (master->username);
     if (master->password)
         xmlFree (master->password);
+    if (master->namespace)
+        xmlFree(master->namespace);
     free (master);
     return next;
 }
@@ -688,7 +690,14 @@ static int update_from_master(master_server *master)
                 }
 
                 r->mount = strdup(parsed_uri->path);
-                r->localmount = strdup(parsed_uri->path);
+                if (master->namespace)
+                {
+                    int mountlen = strlen(master->namespace) + strlen(parsed_uri->path) + 1;
+                    r->localmount = malloc(mountlen);
+                    snprintf(r->localmount, mountlen, "%s%s", master->namespace, parsed_uri->path);
+                } else {
+                    r->localmount = strdup(parsed_uri->path);
+                }
                 r->mp3metadata = 1;
                 r->on_demand = master->on_demand;
                 r->next = new_relays;

src/slave.h

@@ -21,6 +21,7 @@ typedef struct _master_server {
     char *username;
     char *password;
     int on_demand;
+    char *namespace;
     struct _master_server *next;
 } master_server;