Added inbound part of sync. This also meant to remove the black/whitelisting as we did by now. A more scalable way to blacklist will follow.

3 files changed, 114 insertions, 99 deletions

diff --git a/opentracker.c b/opentracker.c
index 7be1421..0ddce0c 100644
--- a/opentracker.c
+++ b/opentracker.c
@@ -56,6 +56,7 @@ struct http_data {
     io_batch batch;
   };
   unsigned char ip[4];
+  int        blessed;
 };
 
 /* Prototypes */
@@ -87,6 +88,7 @@ static void graceful( int s );
 #define HTTPERROR_400         return httperror( s, "400 Invalid Request",       "This server only understands GET." )
 #define HTTPERROR_400_PARAM   return httperror( s, "400 Invalid Request",       "Invalid parameter" )
 #define HTTPERROR_400_COMPACT return httperror( s, "400 Invalid Request",       "This server only delivers compact results." )
+#define HTTPERROR_403_IP      return httperror( s, "403 Access Denied",         "Your ip address is not allowed to administrate this server." )
 #define HTTPERROR_404         return httperror( s, "404 Not Found",             "No such file or directory." )
 #define HTTPERROR_500         return httperror( s, "500 Internal Server Error", "A server error has occured. Please retry later." )
 
@@ -173,6 +175,7 @@ static void senddata( const int64 s, char *buffer, size_t size ) {
 }
 
 static void httpresponse( const int64 s, char *data ) {
+  struct http_data* h = io_getcookie( s );
   char       *c, *reply;
   ot_peer     peer;
   ot_torrent *torrent;
@@ -198,11 +201,48 @@ static void httpresponse( const int64 s, char *data ) {
   for( c = data+4; *c == '/'; ++c);
 
   switch( scan_urlencoded_query( &c, data = c, SCAN_PATH ) ) {
+
+/******************************
+ *         S Y N C            *
+ ******************************/
   case 4: /* sync ? */
     if( byte_diff( data, 4, "sync") ) HTTPERROR_404;
-    if( !( reply_size = return_changeset_for_tracker( &reply ) ) ) HTTPERROR_500;
-    return sendmallocdata( s, reply, reply_size );
+    if( !h->blessed ) HTTPERROR_403_IP;
+
+    mode = SYNC_OUT;
+    scanon = 1;
 
+    while( scanon ) {
+      switch( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_PARAM ) ) {
+      case -2: scanon = 0; break;   /* TERMINATOR */
+      case -1: HTTPERROR_400_PARAM; /* PARSE ERROR */
+      default: scan_urlencoded_query( &c, NULL, SCAN_SEARCHPATH_VALUE ); break;
+      case 9:
+        if(byte_diff(data,9,"changeset")) {
+          scan_urlencoded_query( &c, NULL, SCAN_SEARCHPATH_VALUE );
+          continue;
+        }
+        /* ignore this, when we dont at least see "d4:syncdee" */
+        if( ( len = scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE ) ) < 10 ) HTTPERROR_400_PARAM;
+        if( add_changeset_to_tracker( (ot_byte*)data, len ) ) HTTPERROR_400_PARAM;
+        mode = SYNC_IN;
+        break;
+      }
+    }
+
+    if( mode == SYNC_OUT ) {
+      if( !( reply_size = return_changeset_for_tracker( &reply ) ) ) HTTPERROR_500;
+      return sendmallocdata( s, reply, reply_size );
+    }
+
+    /* Simple but proof for now */
+    reply = "OK";
+    reply_size = 2;
+
+    break;
+/******************************
+ *        S T A T S           *
+ ******************************/
   case 5: /* stats ? */
     if( byte_diff(data,5,"stats")) HTTPERROR_404;
     scanon = 1;
@@ -260,8 +300,11 @@ static void httpresponse( const int64 s, char *data ) {
           if( !( reply_size = return_stats_for_tracker( SUCCESS_HTTP_HEADER_LENGTH + static_outbuf, mode ) ) ) HTTPERROR_500;
           break;
       }
-
     break;
+
+/******************************
+ *       S C R A P E          *
+ ******************************/
   case 6: /* scrape ? */
     if( byte_diff( data, 6, "scrape") ) HTTPERROR_404;
 
@@ -280,7 +323,7 @@ SCRAPE_WORKAROUND:
         }
         /* ignore this, when we have less than 20 bytes */
         if( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE ) != 20 ) HTTPERROR_400_PARAM;
-        hash = (ot_hash*)data; /* Fall through intended */
+        hash = (ot_hash*)data;
         break;
       }
     }
@@ -297,6 +340,9 @@ SCRAPE_WORKAROUND:
 
     ot_overall_tcp_successfulannounces++;
     break;
+/******************************
+ *      A N N O U N C E       *
+ ******************************/
   case 8:
     if( byte_diff( data, 8, "announce" ) ) HTTPERROR_404;
 
@@ -384,7 +430,7 @@ ANNOUNCE_WORKAROUND:
       remove_peer_from_torrent( hash, &peer );
       reply_size = sprintf( static_outbuf + SUCCESS_HTTP_HEADER_LENGTH, "d8:completei0e10:incompletei0e8:intervali%ie5:peers0:e", OT_CLIENT_REQUEST_INTERVAL_RANDOM );
     } else {
-      torrent = add_peer_to_torrent( hash, &peer );
+      torrent = add_peer_to_torrent( hash, &peer, 0 );
       if( !torrent || !( reply_size = return_peers_for_torrent( torrent, numwant, SUCCESS_HTTP_HEADER_LENGTH + static_outbuf, 1 ) ) ) HTTPERROR_500;
     }
     ot_overall_tcp_successfulannounces++;
@@ -438,12 +484,6 @@ static void graceful( int s ) {
 
 static void usage( char *name ) {
   fprintf( stderr, "Usage: %s [-i serverip] [-p serverport] [-d serverdirectory]"
-#ifdef WANT_CLOSED_TRACKER
-  " [-oc]"
-#endif
-#ifdef WANT_BLACKLIST
-  " [-bB]"
-#endif
   "\n", name );
 }
 
@@ -453,23 +493,6 @@ static void help( char *name ) {
                    "\t-p serverport\tspecify tcp port to bind to (default: 6969, you may specify more than one)\n"
                    "\t-P serverport\tspecify udp port to bind to (default: 6969, you may specify more than one)\n"
                    "\t-d serverdir\tspecify directory containing white- or black listed torrent info_hashes (default: \".\")\n"
-#ifdef WANT_CLOSED_TRACKER
-                   "\t-o\t\tmake tracker an open tracker, e.g. do not check for white list (default: off)\n"
-                   "\t-c\t\tmake tracker a closed tracker, e.g. check each announced torrent against white list (default: on)\n"
-#endif
-#ifdef WANT_BLACKLIST
-                   "\t-b\t\tmake tracker check its black list, e.g. check each announced torrent against black list (default: on)\n"
-                   "\t-B\t\tmake tracker check its black list, e.g. check each announced torrent against black list (default: off)\n"
-#endif
-#ifdef WANT_CLOSED_TRACKER
-                   "\n* To white list a torrent, touch a file inside serverdir with info_hash hex string.\n"
-#endif
-#ifdef WANT_BLACKLIST
-#ifndef WANT_CLOSED_TRACKER
-                   "\n"
-#endif
-                   "* To white list a torrent, touch a file inside serverdir with info_hash hex string, preprended by '-'.\n"
-#endif
                    "\nExample:   ./opentracker -i 127.0.0.1 -p 6969 -P 6969 -i 10.1.1.23 -p 2710 -p 80\n"
 );
 }
@@ -503,7 +526,7 @@ static void handle_read( const int64 clientsocket ) {
   if( array_failed( &h->request ) )
     return httperror( clientsocket, "500 Server Error", "Request too long.");
 
-  if( array_bytes( &h->request ) > 8192 )
+  if( ( !h->blessed ) && ( array_bytes( &h->request ) > 8192 ) )
     return httperror( clientsocket, "500 request too long", "You sent too much headers");
 
   if( memchr( array_start( &h->request ), '\n', array_length( &h->request, 1 ) ) )
@@ -626,7 +649,7 @@ static void handle_udp4( int64 serversocket ) {
         outpacket[3] = outpacket[4] = 0;
         r = 20;
       } else {
-        torrent = add_peer_to_torrent( hash, &peer );
+        torrent = add_peer_to_torrent( hash, &peer, 0 );
         if( !torrent )
           return; /* XXX maybe send error */
 
@@ -719,14 +742,6 @@ int main( int argc, char **argv ) {
       case 'P': ot_try_bind( serverip, (uint16)atol( optarg ), 0 ); break;
       case 'd': serverdir = optarg; break;
       case 'h': help( argv[0] ); exit( 0 );
-#ifdef WANT_CLOSED_TRACKER
-      case 'o': g_closedtracker = 0; break;
-      case 'c': g_closedtracker = 1; break;
-#endif
-#ifdef WANT_BLACKLIST
-      case 'b': g_check_blacklist = 1; break;
-      case 'B': g_check_blacklist = 0; break;
-#endif
       default:
       case '?': usage( argv[0] ); exit( 1 );
     }
diff --git a/trackerlogic.c b/trackerlogic.c
index d2d279e..5bda0df 100644
--- a/trackerlogic.c
+++ b/trackerlogic.c
@@ -19,26 +19,12 @@
 #include "scan.h"
 #include "byte.h"
 
-#if defined( WANT_CLOSED_TRACKER ) || defined( WANT_BLACKLIST )
-#include <sys/stat.h>
-#endif
-
 /* GLOBAL VARIABLES */
 static ot_vector all_torrents[256];
 static ot_vector changeset;
 size_t changeset_size = 0;
 time_t last_clean_time = 0;
 
-#ifdef WANT_CLOSED_TRACKER
-int g_closedtracker = 1;
-static ot_torrent* const OT_TORRENT_NOT_ON_WHITELIST = (ot_torrent*)1;
-#endif
-
-#ifdef WANT_BLACKLIST
-int g_check_blacklist = 1;
-static ot_torrent* const OT_TORRENT_ON_BLACKLIST = (ot_torrent*)2;
-#endif
-
 /* Converter function from memory to human readable hex strings
    - definitely not thread safe!!!
 */
@@ -162,25 +148,12 @@ static int vector_remove_torrent( ot_vector *vector, ot_hash *hash ) {
   return 1;
 }
 
-ot_torrent *add_peer_to_torrent( ot_hash *hash, ot_peer *peer ) {
-  int          exactmatch;
+ot_torrent *add_peer_to_torrent( ot_hash *hash, ot_peer *peer, int from_changeset ) {
+  int         exactmatch;
   ot_torrent *torrent;
   ot_peer    *peer_dest;
   ot_vector  *torrents_list = &all_torrents[*hash[0]], *peer_pool;
-#if defined( WANT_CLOSED_TRACKER ) || defined( WANT_BLACKLIST )
-  struct stat dummy_sb;
-  char       *fn = to_hex( (ot_byte*)hash );
-#endif
-
-#ifdef WANT_CLOSED_TRACKER
-  if( g_closedtracker && stat( fn, &dummy_sb ) )
-    return OT_TORRENT_NOT_ON_WHITELIST;
-#endif
-
-#ifdef WANT_BLACKLIST
-  if( g_check_blacklist && !stat( fn - 1, &dummy_sb ) )
-    return OT_TORRENT_ON_BLACKLIST;
-#endif
+  int         base_pool = 0;
 
   torrent = vector_find_or_insert( torrents_list, (void*)hash, sizeof( ot_torrent ), OT_HASH_COMPARE_SIZE, &exactmatch );
   if( !torrent ) return NULL;
@@ -202,7 +175,16 @@ ot_torrent *add_peer_to_torrent( ot_hash *hash, ot_peer *peer ) {
   if( ( OT_FLAG( peer ) & ( PEER_FLAG_COMPLETED | PEER_FLAG_SEEDING ) ) == PEER_FLAG_COMPLETED )
     OT_FLAG( peer ) ^= PEER_FLAG_COMPLETED;
 
-  peer_pool = &torrent->peer_list->peers[0];
+  if( from_changeset ) {
+    /* Check, whether peer already is in current pool, do nothing if so */
+    peer_pool = &torrent->peer_list->peers[0];
+    binary_search( peer, peer_pool->data, peer_pool->size, sizeof(ot_peer), OT_PEER_COMPARE_SIZE, &exactmatch );
+    if( exactmatch )
+      return torrent;
+    base_pool = 1;
+  }
+
+  peer_pool = &torrent->peer_list->peers[ base_pool ];
   peer_dest = vector_find_or_insert( peer_pool, (void*)peer, sizeof( ot_peer ), OT_PEER_COMPARE_SIZE, &exactmatch );
 
   /* If we hadn't had a match in current pool, create peer there and
@@ -215,9 +197,9 @@ ot_torrent *add_peer_to_torrent( ot_hash *hash, ot_peer *peer ) {
       torrent->peer_list->downloaded++;
 
     if( OT_FLAG(peer) & PEER_FLAG_SEEDING )
-      torrent->peer_list->seed_count[0]++;
+      torrent->peer_list->seed_count[ base_pool ]++;
 
-    for( i=1; i<OT_POOLS_COUNT; ++i ) {
+    for( i= base_pool + 1; i<OT_POOLS_COUNT; ++i ) {
       switch( vector_remove_peer( &torrent->peer_list->peers[i], peer, 0 ) ) {
         case 0: continue;
         case 2: torrent->peer_list->seed_count[i]--;
@@ -226,9 +208,9 @@ ot_torrent *add_peer_to_torrent( ot_hash *hash, ot_peer *peer ) {
     }
   } else {
     if( (OT_FLAG(peer_dest) & PEER_FLAG_SEEDING ) && !(OT_FLAG(peer) & PEER_FLAG_SEEDING ) )
-      torrent->peer_list->seed_count[0]--;
+      torrent->peer_list->seed_count[ base_pool ]--;
     if( !(OT_FLAG(peer_dest) & PEER_FLAG_SEEDING ) && (OT_FLAG(peer) & PEER_FLAG_SEEDING ) )
-      torrent->peer_list->seed_count[0]++;
+      torrent->peer_list->seed_count[ base_pool ]++;
     if( !(OT_FLAG( peer_dest ) & PEER_FLAG_COMPLETED ) && (OT_FLAG( peer ) & PEER_FLAG_COMPLETED ) )
       torrent->peer_list->downloaded++;
     if( OT_FLAG( peer_dest ) & PEER_FLAG_COMPLETED )
@@ -250,22 +232,6 @@ size_t return_peers_for_torrent( ot_torrent *torrent, size_t amount, char *reply
   char  *r = reply;
   size_t peer_count, seed_count, index;
 
-#ifdef WANT_CLOSED_TRACKER
-  if( torrent == OT_TORRENT_NOT_ON_WHITELIST ) {
-    const char * const notvalid = "d14:failure reason43:This torrent is not served by this tracker.e";
-    memmove( reply, notvalid, sizeof(notvalid));
-    return sizeof(notvalid);
-  }
-#endif
-
-#ifdef WANT_BLACKLIST
-  if( torrent == OT_TORRENT_ON_BLACKLIST ) {
-    const char * const blacklisted = "d14:failure reason29:This torrent is black listed.e";
-    memmove( reply, blacklisted, sizeof(blacklisted));
-    return sizeof(blacklisted);
-  }
-#endif
-
   for( peer_count = seed_count = index = 0; index < OT_POOLS_COUNT; ++index ) {
     peer_count += torrent->peer_list->peers[index].size;
     seed_count += torrent->peer_list->seed_count[index];
@@ -473,8 +439,48 @@ static void add_pool_to_changeset( ot_hash *hash, ot_peer *peers, size_t peer_co
   changeset_size += r - sizeof( size_t );
 }
 
+/* Import Changeset from an external authority
+   format: d4:syncd[..]ee
+   [..]:   ( 20:01234567890abcdefghij16:XXXXYYYY )+
+*/
+int add_changeset_to_tracker( ot_byte *data, size_t len ) {
+  ot_hash    *hash;
+  ot_byte    *end = data + len;
+  size_t      peer_count;
+
+  /* We do know, that the string is \n terminated, so it cant
+     overflow */
+  if( byte_diff( data, 8, "d4:syncd" ) ) return -1;
+  data += 8;
+
+  while( 1 ) {
+    if( byte_diff( data, 3, "20:" ) ) {
+      if( byte_diff( data, 2, "ee" ) )
+        return -1;
+      return 0;
+    }
+    data += 3;
+    hash = (ot_hash*)data;
+    data += sizeof( ot_hash );
+
+    /* Scan string length indicator */
+    data += ( len = scan_ulong( (char*)data, &peer_count ) );
+
+    /* If no long was scanned, it is not divisible by 8, it is not
+       followed by a colon or claims to need to much memory, we fail */
+    if( !len || !peer_count || ( peer_count & 7 ) || ( *data++ != ':' ) || ( data + peer_count > end ) )
+      return -1;
+
+    while( peer_count > 0 ) {
+      add_peer_to_torrent( hash, (ot_peer*)data, 1 );
+      data += 8; peer_count -= 8;
+    }
+  }
+  return 0;
+}
+
 /* Proposed output format
-   d4:syncd20:<info_hash>8*N:(xxxxyy)*Nee
+   d4:syncd20:<info_hash>8*N:(xxxxyyyy)*Nee
 */
 size_t return_changeset_for_tracker( char **reply ) {
   size_t i, r = 8;
diff --git a/trackerlogic.h b/trackerlogic.h
index dfd5047..4fa48eb 100644
--- a/trackerlogic.h
+++ b/trackerlogic.h
@@ -84,16 +84,10 @@ typedef struct {
 int  init_logic( const char * const serverdir );
 void deinit_logic( void );
 
-#ifdef WANT_CLOSED_TRACKER
-extern int g_closedtracker;
-#endif
-#ifdef WANT_BLACKLIST
-extern int g_check_blacklist;
-#endif
-
-enum { STATS_MRTG, STATS_TOP5, STATS_DMEM, STATS_TCP, STATS_UDP };
+enum { STATS_MRTG, STATS_TOP5, STATS_DMEM, STATS_TCP, STATS_UDP, SYNC_IN, SYNC_OUT };
 
-ot_torrent *add_peer_to_torrent( ot_hash *hash, ot_peer *peer );
+ot_torrent *add_peer_to_torrent( ot_hash *hash, ot_peer *peer, int from_changeset );
+int    add_changeset_to_tracker( ot_byte *data, size_t len );
 size_t return_peers_for_torrent( ot_torrent *torrent, size_t amount, char *reply, int is_tcp );
 size_t return_fullscrape_for_tracker( char **reply );
 size_t return_tcp_scrape_for_torrent( ot_hash *hash, char *reply );