From 5168a3314c822a74389011d44277e70c329590b0 Mon Sep 17 00:00:00 2001
From: erdgeist <>
Date: Tue, 29 Sep 2009 06:03:39 +0000
Subject: Reaching completion soon

---
 proxy.c | 468 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 413 insertions(+), 55 deletions(-)

diff --git a/proxy.c b/proxy.c
index 3577f44..c27599b 100644
--- a/proxy.c
+++ b/proxy.c
@@ -4,6 +4,7 @@
    $Id$ */
 
 /* System */
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <arpa/inet.h>
@@ -14,6 +15,7 @@
 #include <stdio.h>
 #include <pwd.h>
 #include <ctype.h>
+#include <pthread.h>
 
 /* Libowfat */
 #include "socket.h"
@@ -26,30 +28,59 @@
 
 /* Opentracker */
 #include "trackerlogic.h"
+#include "ot_vector.h"
+#include "ot_mutex.h"
 #include "ot_livesync.h"
+#include "ot_stats.h"
 
+ot_ip6   g_serverip; 
+uint16_t g_serverport = 9009;
 uint32_t g_tracker_id;
-char groupip_1[4] = { 224,0,23,5 };
+char     groupip_1[4] = { 224,0,23,5 };
+int      g_self_pipe[2];
+
+/* If you have more than 10 peers, don't use this proxy
+   Use 20 slots for 10 peers to have room for 10 incoming connection slots
+ */
+#define MAX_PEERS 20
 
 #define LIVESYNC_INCOMING_BUFFSIZE          (256*256)
+#define STREAMSYNC_OUTGOING_BUFFSIZE        (256*256)
 
 #define LIVESYNC_OUTGOING_BUFFSIZE_PEERS     1480
 #define LIVESYNC_OUTGOING_WATERMARK_PEERS   (sizeof(ot_peer)+sizeof(ot_hash))
 
+/* The amount of time a complete sync cycle should take */
+#define OT_SYNC_INTERVAL_MINUTES             2
+
+/* So after each bucket wait 1 / OT_BUCKET_COUNT intervals */
+#define OT_SYNC_SLEEP ( ( ( OT_SYNC_INTERVAL_MINUTES ) * 60 * 1000000 ) / ( OT_BUCKET_COUNT ) )
+
 enum { OT_SYNC_PEER };
+enum { FLAG_SERVERSOCKET = 1 };
 
-/* For outgoing packets */
+/* For incoming packets */
 static int64    g_socket_in = -1;
+static uint8_t  g_inbuffer[LIVESYNC_INCOMING_BUFFSIZE];
 
-/* For incoming packets */
+/* For outgoing packets */
 static int64    g_socket_out = -1;
-static uint8_t  g_inbuffer[LIVESYNC_INCOMING_BUFFSIZE];
+//static uint8_t  g_outbuffer[STREAMSYNC_OUTGOING_BUFFSIZE];
+
+static void * livesync_worker( void * args );
+static void * streamsync_worker( void * args );
 
 void exerr( char * message ) {
   fprintf( stderr, "%s\n", message );
   exit( 111 );
 }
 
+void stats_issue_event( ot_status_event event, PROTO_FLAG proto, uintptr_t event_data ) {
+  (void) event;
+  (void) proto;
+  (void) event_data;
+}
+
 void livesync_bind_mcast( ot_ip6 ip, uint16_t port) {
   char tmpip[4] = {0,0,0,0};
   char *v4ip;
@@ -80,16 +111,6 @@ void livesync_bind_mcast( ot_ip6 ip, uint16_t port) {
   socket_mcloop4(g_socket_out, 1);
 }
 
-static ot_vector all_torrents[OT_BUCKET_COUNT];
-ot_vector *mutex_bucket_lock_by_hash( ot_hash hash ) {
-  return all_torrents + ( uint32_read_big( (char*)hash ) >> OT_BUCKET_COUNT_SHIFT );
-}
-ot_vector *mutex_bucket_lock( int bucket ) {
-  return all_torrents + bucket;
-}
-#define mutex_bucket_unlock_by_hash(A,B)
-#define mutex_bucket_unlock(A)
-
 size_t add_peer_to_torrent_proxy( ot_hash hash, ot_peer *peer ) {
   int         exactmatch;
   ot_torrent *torrent;
@@ -106,6 +127,7 @@ size_t add_peer_to_torrent_proxy( ot_hash hash, ot_peer *peer ) {
 
     if( !( torrent->peer_list = malloc( sizeof (ot_peerlist) ) ) ) {
       vector_remove_torrent( torrents_list, torrent );
+      mutex_bucket_unlock_by_hash( hash, 0 );
       return -1;
     }
 
@@ -114,8 +136,10 @@ size_t add_peer_to_torrent_proxy( ot_hash hash, ot_peer *peer ) {
 
   /* Check for peer in torrent */
   peer_dest = vector_find_or_insert_peer( &(torrent->peer_list->peers), peer, &exactmatch );
-  if( !peer_dest ) return -1;
-
+  if( !peer_dest ) {
+    mutex_bucket_unlock_by_hash( hash, 0 );
+    return -1;
+  }
   /* Tell peer that it's fresh */
   OT_PEERTIME( peer ) = 0;
 
@@ -126,6 +150,7 @@ size_t add_peer_to_torrent_proxy( ot_hash hash, ot_peer *peer ) {
       torrent->peer_list->seed_count++;
   }
   memcpy( peer_dest, peer, sizeof(ot_peer) );
+  mutex_bucket_unlock_by_hash( hash, 0 );
   return 0;
 }
 
@@ -143,6 +168,7 @@ size_t remove_peer_from_torrent_proxy( ot_hash hash, ot_peer *peer ) {
     }
   }
 
+  mutex_bucket_unlock_by_hash( hash, 0 );
   return 0;
 }
 
@@ -182,16 +208,243 @@ int usage( char *self ) {
   return 0;
 }
 
-static uint32_t peer_counts[1024];
-#ifdef WANT_SCROOOOOOOLL
-static char*to_hex(char*d,uint8_t*s){char*m="0123456789ABCDEF";char *t=d;char*e=d+40;while(d<e){*d++=m[*s>>4];*d++=m[*s++&15];}*d=0;return t;}
-#endif
+enum {
+  FLAG_OUTGOING      = 0x80,
+
+  FLAG_DISCONNECTED  = 0x00,
+  FLAG_CONNECTING    = 0x01,
+  FLAG_WAITTRACKERID = 0x02,
+  FLAG_CONNECTED     = 0x03,
+
+  FLAG_MASK          = 0x07
+};
+
+#define PROXYPEER_NEEDSCONNECT(flag)      ((flag)==FLAG_OUTGOING)
+#define PROXYPEER_SETDISCONNECTED(flag)   (flag)=(((flag)&FLAG_OUTGOING)|FLAG_DISCONNECTED)
+#define PROXYPEER_SETCONNECTING(flag)     (flag)=(((flag)&FLAG_OUTGOING)|FLAG_CONNECTING)
+#define PROXYPEER_SETWAITTRACKERID(flag)  (flag)=(((flag)&FLAG_OUTGOING)|FLAG_WAITTRACKERID)
+#define PROXYPEER_SETCONNECTED(flag)      (flag)=(((flag)&FLAG_OUTGOING)|FLAG_CONNECTED)
+
+typedef struct {
+  int      state;          /* Whether we want to connect, how far our handshake is, etc. */
+  ot_ip6   ip;             /* The peer to connect to */
+  uint16_t port;           /* The peers port */
+  uint8_t *indata;         /* Any data not processed yet */
+  size_t   indata_length;  /* Length of unprocessed data */
+  uint32_t tracker_id;     /* How the other end greeted */
+  int64    fd;             /* A file handle, if connected, <= 0 is disconnected (0 initially, -1 else) */
+  io_batch outdata;        /* The iobatch containing our sync data */
+} proxy_peer;
+
+/* Number of connections to peers
+   * If a peer's IP is set, we try to reconnect, when the connection drops
+   * If we already have a connected tracker_id in our records for an _incoming_ connection, drop it
+   * Multiple connections to/from the same ip are okay, if tracker_id doesn't match
+   * Reconnect attempts occur only twice a minute
+*/
+static int        g_connection_count;
+static ot_time    g_connection_reconn;
+static proxy_peer g_connections[MAX_PEERS];
+
+static void handle_reconnects( void ) {
+  int i;
+  for( i=0; i<g_connection_count; ++i )
+    if( PROXYPEER_NEEDSCONNECT( g_connections[i].state ) ) {
+      int64 newfd = socket_tcp6( );
+      if( newfd < 0 ) continue; /* No socket for you */
+      io_fd(newfd);
+      if( socket_bind6_reuse(newfd,g_serverip,g_serverport,0) ) {
+        io_close( newfd );
+        continue;
+      }
+      if( socket_connect6(newfd,g_connections[i].ip,g_connections[i].port,0) == -1 &&
+          errno != EINPROGRESS && errno != EWOULDBLOCK ) {
+        close(newfd);
+        continue;
+      }
+      io_wantwrite(newfd); /* So we will be informed when it is connected */
+      io_setcookie(newfd,g_connections+i);
+
+      /* Prepare connection info block */
+      free( g_connections[i].indata );
+      g_connections[i].indata        = 0;
+      g_connections[i].indata_length = 0;
+      g_connections[i].fd            = newfd;
+      g_connections[i].tracker_id    = 0;
+      iob_reset( &g_connections[i].outdata );
+      PROXYPEER_SETCONNECTING( g_connections[i].state );
+    }
+  g_connection_reconn = time(NULL) + 30;
+}
+
+/* Handle incoming connection requests, check against whitelist */
+static void handle_accept( int64 serversocket ) {
+  int64 newfd;
+  ot_ip6 ip;
+  uint16 port;
+
+  while( ( newfd = socket_accept6( serversocket, ip, &port, NULL ) ) != -1 ) {
+
+    /* XXX some access control */
+
+    /* Put fd into a non-blocking mode */
+    io_nonblock( newfd );
+
+    if( !io_fd( newfd ) )
+      io_close( newfd );
+    else {
+      /* Find a new home for our incoming connection */
+      int i;
+      for( i=0; i<MAX_PEERS; ++i )
+        if( g_connections[i].state == FLAG_DISCONNECTED )
+          break;
+      if( i == MAX_PEERS ) {
+        fprintf( stderr, "No room for incoming connection." );
+        close( newfd );
+        continue;
+      }
+
+      /* Prepare connection info block */
+      free( g_connections[i].indata );
+      g_connections[i].indata        = 0;
+      g_connections[i].indata_length = 0;
+      g_connections[i].port          = port;
+      g_connections[i].fd            = newfd;
+      g_connections[i].tracker_id    = 0;
+      iob_reset( &g_connections[i].outdata );
+      g_connections[i].tracker_id    = 0;
+
+      PROXYPEER_SETCONNECTING( g_connections[i].state );
+
+      io_setcookie( newfd, g_connections + i );
+
+      /* We expect the connecting side to begin with its tracker_id */
+      io_wantread( newfd );
+    }
+  }
+
+  return;
+}
+
+/* New sync data on the stream */
+static void handle_read( int64 peersocket ) {
+  uint32_t tracker_id;
+  proxy_peer *peer = io_getcookie( peersocket );
+  if( !peer ) {
+    /* Can't happen ;) */
+    close( peersocket );
+    return;
+  }
+  switch( peer->state & FLAG_MASK ) {
+  case FLAG_DISCONNECTED: break; /* Shouldnt happen */
+  case FLAG_CONNECTING:
+  case FLAG_WAITTRACKERID:
+    /* We want at least the first four bytes to come at once, to avoid keeping extra states (for now) */
+    if( io_tryread( peersocket, &tracker_id, sizeof( tracker_id ) ) != sizeof( tracker_id ) )
+      goto close_socket;
+
+    /* See, if we already have a connection to that peer */
+    for( i=0; i<MAX_PEERS; ++i )
+      if( ( g_connections[i].state & FLAG_MASK ) == FLAG_CONNECTED && 
+            g_connections[i].tracker_id == tracker_id )
+        goto close_socket;
+
+    /* Also no need for soliloquy */
+    if( tracker_id == g_tracker_id )
+      goto close_socket;
+
+    /* The new connection is good, send our tracker_id on incoming connections */
+    if( peer->state == FLAG_CONNECTING )
+      io_trywrite( peersocket, (void*)&g_tracker_id, sizeof( g_tracker_id ) );
+
+    peer->tracker_id = tracker_id;
+    PROXYPEER_SETCONNECTED( peer->state );
+
+    break;
+close_socket:
+    io_close( peersocket );
+    PROXYPEER_SETDISCONNECTED( peer->state );
+    break;
+  case FLAG_CONNECTED:
+    
+    break;
+
+  }
+}
+
+/* Can write new sync data to the stream */
+static void handle_write( int64 peersocket ) {
+  proxy_peer *peer = io_getcookie( peersocket );
+  if( !peer ) { 
+    /* Can't happen ;) */
+    close( peersocket );
+    return;
+  }
+
+  switch( peer->state & FLAG_MASK ) {
+  case FLAG_DISCONNECTED: break; /* Shouldnt happen */
+  case FLAG_CONNECTING:
+    io_trywrite( peersocket, (void*)&g_tracker_id, sizeof( g_tracker_id ) );
+    PROXYPEER_SETWAITTRACKERID( peer->state );
+    io_dontwantwrite( peersocket );
+    io_wantread( peersocket );
+    break;
+  case FLAG_CONNECTED:
+    switch( iob_send( peersocket, &peer->outdata ) ) {
+    case 0: /* all data sent */
+      io_dontwantwrite( peersocket );
+      break;
+    case -3: /* an error occured */
+      io_close( peersocket );
+      PROXYPEER_SETDISCONNECTED( peer->state );
+      iob_reset( &peer->outdata );
+      free( peer->indata );
+    default: /* Normal operation or eagain */
+      break;
+    }
+    break;
+  default:
+    break;
+  }
+
+  return;
+}
+
+static void server_mainloop() {
+  int64 sock;
+  tai6464 now;
+
+  while(1) {
+    /* See, if we need to connect to anyone */
+    if( time(NULL) > g_connection_reconn )
+      handle_reconnects( );
+
+    /* Wait for io events until next approx reconn check time */
+    taia_now( &now );
+    taia_addsec( &now, &now, 30 );
+    io_waituntil( now );
+
+    /* Loop over readable sockets */
+    while( ( sock = io_canread( ) ) != -1 ) {
+      const void *cookie = io_getcookie( sock );
+      if( (uintptr_t)cookie == FLAG_SERVERSOCKET )
+        handle_accept( sock );
+      else
+        handle_read( sock );
+    }
+
+    /* Loop over writable sockets */
+    while( ( sock = io_canwrite( ) ) != -1 )
+      handle_write( sock );
+  }
+}
 
 int main( int argc, char **argv ) {
+  static pthread_t sync_in_thread_id;
+  static pthread_t sync_out_thread_id;
   ot_ip6 serverip;
   uint16_t tmpport;
   int scanon = 1, bound = 0;
-  time_t next_dump = time(NULL)+1;
 
   srandom( time(NULL) );
   g_tracker_id = random();
@@ -199,7 +452,7 @@ int main( int argc, char **argv ) {
   while( scanon ) {
     switch( getopt( argc, argv, ":i:p:vh" ) ) {
     case -1: scanon = 0; break;
-    case 'i': 
+    case 'S': 
       if( !scan_ip6( optarg, serverip )) { usage( argv[0] ); exit( 1 ); }
       break;
     case 'p':
@@ -211,7 +464,144 @@ int main( int argc, char **argv ) {
   }
 
   if( !bound ) exerr( "No port bound." );
+  pthread_create( &sync_in_thread_id, NULL, livesync_worker, NULL );
+  pthread_create( &sync_out_thread_id, NULL, streamsync_worker, NULL );
+
+  server_mainloop();
+  return 0;
+}
+
+static void * streamsync_worker( void * args ) {
+  (void)args;
+  while( 1 ) {
+    int bucket;
+    /* For each bucket... */
+    for( bucket=0; bucket<OT_BUCKET_COUNT; ++bucket ) {
+      /* Get exclusive access to that bucket */
+      ot_vector *torrents_list = mutex_bucket_lock( bucket );
+      size_t tor_offset, count_def = 0, count_one = 0, count_two = 0, count_peers = 0;
+      size_t mem, mem_a = 0, mem_b = 0;
+      uint8_t *ptr, *ptr_a, *ptr_b, *ptr_c;
+
+      /* For each torrent in this bucket.. */
+      for( tor_offset=0; tor_offset<torrents_list->size; ++tor_offset ) {
+        /* Address torrents members */
+        ot_peerlist *peer_list = ( ((ot_torrent*)(torrents_list->data))[tor_offset] ).peer_list;
+        switch( peer_list->peer_count ) {
+          case 2: count_two++; break;
+          case 1: count_one++; break;
+          case 0: break;
+          default:
+            count_peers += peer_list->peer_count;
+            count_def   += 1 + ( peer_list->peer_count >> 8 );
+        }
+      }
+
+      /* Maximal memory requirement: max 3 blocks, max torrents * 20 + max peers * 7 */
+      mem = 3 * ( 4 + 1 + 1 + 2 ) + ( count_one + count_two ) * 19 + count_def * 20 +
+            ( count_one + 2 * count_two + count_peers ) * 7;
+
+      ptr = ptr_a = ptr_b = ptr_c = malloc( mem );
+      if( !ptr ) goto unlock_continue;
+
+      if( count_one > 8 ) {
+        mem_a = 4 + 1 + 1 + 2 + count_one * ( 19 + 7 );
+        ptr_b += mem_a; ptr_c += mem_a;
+        memcpy( ptr_a, &g_tracker_id, sizeof(g_tracker_id)); /* Offset 0: the tracker ID */
+        ptr_a[4] = 1;                                       /* Offset 4: packet type 1 */
+        ptr_a[5] = (bucket << 8) >> OT_BUCKET_COUNT_BITS;   /* Offset 5: the shared prefix */
+        ptr_a[6] = count_one >> 8;
+        ptr_a[7] = count_one & 255;
+        ptr_a += 8;
+      } else {
+        count_def   += count_one;
+        count_peers += count_one;
+      }
+
+      if( count_two > 8 ) {
+        mem_b = 4 + 1 + 1 + 2 + count_two * ( 19 + 14 );
+        ptr_c += mem_b;
+        memcpy( ptr_b, &g_tracker_id, sizeof(g_tracker_id)); /* Offset 0: the tracker ID */
+        ptr_b[4] = 2;                                       /* Offset 4: packet type 2 */
+        ptr_b[5] = (bucket << 8) >> OT_BUCKET_COUNT_BITS;   /* Offset 5: the shared prefix */
+        ptr_b[6] = count_two >> 8;
+        ptr_b[7] = count_two & 255;
+        ptr_b += 8;
+      } else {
+        count_def   += count_two;
+        count_peers += 2 * count_two;
+      }
+
+      if( count_def ) {
+        memcpy( ptr_c, &g_tracker_id, sizeof(g_tracker_id)); /* Offset 0: the tracker ID */
+        ptr_c[4] = 0;                                       /* Offset 4: packet type 0 */
+        ptr_c[5] = (bucket << 8) >> OT_BUCKET_COUNT_BITS;   /* Offset 5: the shared prefix */
+        ptr_c[6] = count_def >> 8;
+        ptr_c[7] = count_def & 255;
+        ptr_c += 8;
+      }
+
+      /* For each torrent in this bucket.. */
+      for( tor_offset=0; tor_offset<torrents_list->size; ++tor_offset ) {
+        /* Address torrents members */
+        ot_torrent *torrent = ((ot_torrent*)(torrents_list->data)) + tor_offset;
+        ot_peerlist *peer_list = torrent->peer_list;
+        ot_peer *peers = (ot_peer*)(peer_list->peers.data);
+        uint8_t **dst;
+        int multi = 0;
+        switch( peer_list->peer_count ) {
+          case 0:  continue;
+          case 1:  dst = mem_a ? &ptr_a : &ptr_c; break;
+          case 2:  dst = mem_b ? &ptr_b : &ptr_c; break;
+          default: dst = &ptr_c; multi = 1; break;
+        }
+
+        do {
+          size_t i, pc = peer_list->peer_count;
+          if( pc > 255 ) pc = 255;
+          memcpy( *dst, torrent->hash + 1, sizeof( ot_hash ) - 1);
+          *dst += sizeof( ot_hash ) - 1;
+          if( multi ) *(*dst)++ = pc;
+          for( i=0; i < pc; ++i ) {
+            memcpy( *dst, peers++, OT_IP_SIZE + 3 );
+            *dst += OT_IP_SIZE + 3;
+          }
+          peer_list->peer_count -= pc; 
+        } while( peer_list->peer_count );
+        free_peerlist(peer_list);
+      }
+
+      free( torrents_list->data );
+      memset( torrents_list, 0, sizeof(*torrents_list ) );
+unlock_continue:
+      mutex_bucket_unlock( bucket, 0 );
+
+      if( ptr ) {
+        int i;
+
+        if( ptr_b > ptr_c ) ptr_c = ptr_b;
+        if( ptr_a > ptr_c ) ptr_c = ptr_a;
+        mem = ptr_c - ptr;
+
+        for( i=0; i<g_connection_count; ++i ) {
+          if( g_connections[i].fd != -1 ) {
+            void *tmp = malloc( mem );
+            if( tmp )
+              if( !iob_addbuf_free( &g_connections[i].outdata, tmp, mem ) )
+                free( tmp );
+          }
+        }
+
+        free( ptr );
+      }
+      usleep( OT_SYNC_SLEEP );
+    }
+  }
+  return 0;
+}
 
+static void * livesync_worker( void * args ) {
+  (void)args;
   while( 1 ) {
     ot_ip6 in_ip; uint16_t in_port;
     size_t datalen = socket_recv4(g_socket_in, (char*)g_inbuffer, LIVESYNC_INCOMING_BUFFSIZE, 12+(char*)in_ip, &in_port);
@@ -223,7 +613,6 @@ int main( int argc, char **argv ) {
       /* drop packet coming from ourselves */
       continue;
     }
-
     switch( uint32_read_big( sizeof( g_tracker_id ) + (char*)g_inbuffer ) ) {
     case OT_SYNC_PEER:
       livesync_handle_peersync( datalen );
@@ -232,37 +621,6 @@ int main( int argc, char **argv ) {
       fprintf( stderr, "Received an unknown live sync packet type %u.\n", uint32_read_big( sizeof( g_tracker_id ) + (char*)g_inbuffer ) );
       break;
     }
-    if( time(NULL) > next_dump ) {
-      int bucket, i;
-      /* For each bucket... */
-      for( bucket=0; bucket<OT_BUCKET_COUNT; ++bucket ) {
-        /* Get exclusive access to that bucket */
-        ot_vector *torrents_list = mutex_bucket_lock( bucket );
-        size_t tor_offset;
-
-        /* For each torrent in this bucket.. */
-        for( tor_offset=0; tor_offset<torrents_list->size; ++tor_offset ) {
-          /* Address torrents members */
-          ot_peerlist *peer_list = ( ((ot_torrent*)(torrents_list->data))[tor_offset] ).peer_list;
-#ifdef WANT_SCROOOOOOOLL
-          ot_hash     *hash      =&( ((ot_torrent*)(torrents_list->data))[tor_offset] ).hash;
-          char hash_out[41];
-          to_hex(hash_out,*hash);
-          printf( "%s %08zd\n", hash_out, peer_list->peer_count );
-#endif
-          if(peer_list->peer_count<1024) peer_counts[peer_list->peer_count]++; else peer_counts[1023]++;
-          free_peerlist(peer_list);
-        }
-        free( torrents_list->data );
-        memset( torrents_list, 0, sizeof(*torrents_list ) );
-      }
-      for( i=1023; i>=0; --i )
-        if( peer_counts[i] ) {
-          printf( "%d:%d ", i, peer_counts[i] );
-          peer_counts[i] = 0;
-        }
-      printf( "\n" );
-      next_dump = time(NULL) + 1;
-    } 
   }
+  return 0;
 }
-- 
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