Enable live syncing v6 peers

2 files changed, 63 insertions, 31 deletions

diff --git a/ot_livesync.c b/ot_livesync.c
index b87fa6d..335cce5 100644
--- a/ot_livesync.c
+++ b/ot_livesync.c
@@ -35,7 +35,7 @@ char groupip_1[4] = { 224,0,23,5 };
 
 #define LIVESYNC_MAXDELAY                    15      /* seconds */
 
-enum { OT_SYNC_PEER };
+enum { OT_SYNC_PEER4, OT_SYNC_PEER6 };
 
 /* Forward declaration */
 static void * livesync_worker( void * args );
@@ -47,9 +47,14 @@ static int64    g_socket_in = -1;
 static int64    g_socket_out = -1;
 
 static pthread_mutex_t g_outbuf_mutex = PTHREAD_MUTEX_INITIALIZER;
-char            g_outbuf[LIVESYNC_OUTGOING_BUFFSIZE_PEERS];
-static size_t   g_outbuf_data;
-static ot_time  g_next_packet_time;
+typedef struct {
+    uint8_t  data[LIVESYNC_OUTGOING_BUFFSIZE_PEERS];
+    size_t   fill;
+    ot_time  next_packet_time;
+} sync_buffer;
+
+static sync_buffer g_v6_buf;
+static sync_buffer g_v4_buf;
 
 static pthread_t thread_id;
 void livesync_init( ) {
@@ -58,11 +63,17 @@ void livesync_init( ) {
     exerr( "No socket address for live sync specified." );
 
   /* Prepare outgoing peers buffer */
-  memcpy( g_outbuf, &g_tracker_id, sizeof( g_tracker_id ) );
-  uint32_pack_big( g_outbuf + sizeof( g_tracker_id ), OT_SYNC_PEER);
-  g_outbuf_data = sizeof( g_tracker_id ) + sizeof( uint32_t );
+  memcpy( g_v6_buf.data, &g_tracker_id, sizeof( g_tracker_id ) );
+  memcpy( g_v4_buf.data, &g_tracker_id, sizeof( g_tracker_id ) );
+
+  uint32_pack_big( (char*)g_v6_buf.data + sizeof( g_tracker_id ), OT_SYNC_PEER6);
+  uint32_pack_big( (char*)g_v4_buf.data + sizeof( g_tracker_id ), OT_SYNC_PEER4);
+
+  g_v6_buf.fill = sizeof( g_tracker_id ) + sizeof( uint32_t );
+  g_v4_buf.fill = sizeof( g_tracker_id ) + sizeof( uint32_t );
 
-  g_next_packet_time = g_now_seconds + LIVESYNC_MAXDELAY;
+  g_v6_buf.next_packet_time = g_now_seconds + LIVESYNC_MAXDELAY;
+  g_v4_buf.next_packet_time = g_now_seconds + LIVESYNC_MAXDELAY;
 
   pthread_create( &thread_id, NULL, livesync_worker, NULL );
 }
@@ -107,28 +118,28 @@ void livesync_bind_mcast( ot_ip6 ip, uint16_t port) {
 }
 
 /* Caller MUST hold g_outbuf_mutex. Returns with g_outbuf_mutex unlocked */
-static void livesync_issue_peersync( ) {
+static void livesync_issue_peersync( sync_buffer *buf ) {
   char   mycopy[LIVESYNC_OUTGOING_BUFFSIZE_PEERS];
-  size_t data = g_outbuf_data;
+  size_t fill = buf->fill;
 
-  memcpy( mycopy, g_outbuf, data );
-  g_outbuf_data = sizeof( g_tracker_id ) + sizeof( uint32_t );
-  g_next_packet_time = g_now_seconds + LIVESYNC_MAXDELAY;
+  memcpy( mycopy, buf->data, fill );
+  buf->fill = sizeof( g_tracker_id ) + sizeof( uint32_t );
+  buf->next_packet_time = g_now_seconds + LIVESYNC_MAXDELAY;
 
   /* From now this thread has a local copy of the buffer and
      has modified the protected element */
   pthread_mutex_unlock(&g_outbuf_mutex);
 
-  socket_send4(g_socket_out, mycopy, data, groupip_1, LIVESYNC_PORT);
+  socket_send4(g_socket_out, mycopy, fill, groupip_1, LIVESYNC_PORT);
 }
 
-static void livesync_handle_peersync( struct ot_workstruct *ws ) {
-  int off = sizeof( g_tracker_id ) + sizeof( uint32_t );
+static void livesync_handle_peersync( struct ot_workstruct *ws, size_t peer_size ) {
+  size_t off = sizeof( g_tracker_id ) + sizeof( uint32_t );
 
   /* Now basic sanity checks have been done on the live sync packet
      We might add more testing and logging. */
-  while( off + (ssize_t)sizeof( ot_hash ) + OT_PEER_SIZE4 <= ws->request_size ) {
-    memcpy( &ws->peer, ws->request + off + sizeof(ot_hash), OT_PEER_SIZE4 );
+  while( (ssize_t)(off + sizeof( ot_hash ) + peer_size) <= ws->request_size ) {
+    memcpy( &ws->peer, ws->request + off + sizeof(ot_hash), peer_size );
     ws->hash = (ot_hash*)(ws->request + off);
 
     if( !g_opentracker_running ) return;
@@ -138,12 +149,12 @@ static void livesync_handle_peersync( struct ot_workstruct *ws ) {
     else
       add_peer_to_torrent_and_return_peers( FLAG_MCA, ws, /* amount = */ 0 );
 
-    off += sizeof( ot_hash ) + sizeof( ot_peer );
+    off += sizeof( ot_hash ) + peer_size;
   }
 
   stats_issue_event(EVENT_SYNC, 0,
                     (ws->request_size - sizeof( g_tracker_id ) - sizeof( uint32_t ) ) /
-                    ((ssize_t)sizeof( ot_hash ) + OT_PEER_SIZE4));
+                    ((ssize_t)sizeof( ot_hash ) + peer_size));
 }
 
 /* Tickle the live sync module from time to time, so no events get
@@ -152,24 +163,36 @@ static void livesync_handle_peersync( struct ot_workstruct *ws ) {
 void livesync_ticker( ) {
   /* livesync_issue_peersync sets g_next_packet_time */
   pthread_mutex_lock(&g_outbuf_mutex);
-  if( g_now_seconds > g_next_packet_time &&
-     g_outbuf_data > sizeof( g_tracker_id ) + sizeof( uint32_t ) )
-    livesync_issue_peersync();
+  if( g_now_seconds > g_v6_buf.next_packet_time &&
+     g_v6_buf.fill > sizeof( g_tracker_id ) + sizeof( uint32_t ) )
+    livesync_issue_peersync(&g_v6_buf);
+  else
+    pthread_mutex_unlock(&g_outbuf_mutex);
+
+  pthread_mutex_lock(&g_outbuf_mutex);
+  if( g_now_seconds > g_v4_buf.next_packet_time &&
+     g_v4_buf.fill > sizeof( g_tracker_id ) + sizeof( uint32_t ) )
+    livesync_issue_peersync(&g_v4_buf);
   else
     pthread_mutex_unlock(&g_outbuf_mutex);
 }
 
 /* Inform live sync about whats going on. */
 void livesync_tell( struct ot_workstruct *ws ) {
+  size_t       peer_size; /* initialized in next line */
+  ot_peer     *peer_src = peer_from_peer6(&ws->peer, &peer_size);
+  sync_buffer *dest_buf = peer_size == OT_PEER_SIZE6 ? &g_v6_buf : &g_v4_buf;
+
   pthread_mutex_lock(&g_outbuf_mutex);
 
-  memcpy( g_outbuf + g_outbuf_data, ws->hash, sizeof(ot_hash) );
-  memcpy( g_outbuf + g_outbuf_data + sizeof(ot_hash), &ws->peer, OT_PEER_SIZE4 );
+  memcpy( dest_buf->data + dest_buf->fill, ws->hash, sizeof(ot_hash) );
+  dest_buf->fill += sizeof(ot_hash);
 
-  g_outbuf_data += sizeof(ot_hash) + OT_PEER_SIZE4;
+  memcpy( dest_buf->data + dest_buf->fill, peer_src, peer_size );
+  dest_buf->fill += peer_size;
 
-  if( g_outbuf_data >= LIVESYNC_OUTGOING_BUFFSIZE_PEERS - LIVESYNC_OUTGOING_WATERMARK_PEERS )
-    livesync_issue_peersync();
+  if( dest_buf->fill >= LIVESYNC_OUTGOING_BUFFSIZE_PEERS - LIVESYNC_OUTGOING_WATERMARK_PEERS )
+    livesync_issue_peersync(dest_buf);
   else
     pthread_mutex_unlock(&g_outbuf_mutex);
 }
@@ -200,8 +223,11 @@ static void * livesync_worker( void * args ) {
     }
 
     switch( uint32_read_big( sizeof( g_tracker_id ) + (char *)ws.inbuf ) ) {
-    case OT_SYNC_PEER:
-      livesync_handle_peersync( &ws );
+    case OT_SYNC_PEER6:
+      livesync_handle_peersync( &ws, OT_PEER_SIZE6 );
+      break;
+    case OT_SYNC_PEER4:
+      livesync_handle_peersync( &ws, OT_PEER_SIZE4 );
       break;
     default:
       break;
diff --git a/ot_livesync.h b/ot_livesync.h
index d7490e5..41bfc2e 100644
--- a/ot_livesync.h
+++ b/ot_livesync.h
@@ -28,13 +28,19 @@
   Each tracker instance accumulates announce requests until its buffer is
   full or a timeout is reached. Then it broadcasts its live sync packer:
 
-  packet type SYNC_LIVE
+  packet type SYNC_LIVE4
   [ 0x0008 0x14 info_hash
     0x001c 0x04 peer's ipv4 address
     0x0020 0x02 peer's port
     0x0024 0x02 peer flags v1 ( SEEDING = 0x80, COMPLETE = 0x40, STOPPED = 0x20 )
   ]*
 
+  packet type SYNC_LIVE6
+  [ 0x0008 0x14 info_hash
+    0x001c 0x10 peer's ipv6 address
+    0x002c 0x02 peer's port
+    0x002e 0x02 peer flags v1 ( SEEDING = 0x80, COMPLETE = 0x40, STOPPED = 0x20 )
+  ]*
 */
 
 #ifdef WANT_SYNC_LIVE