An open and free bittorrent tracker https://erdgeist.org/gitweb/opentracker
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/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
It is considered beerware. Prost. Skol. Cheers or whatever.
Some of the stuff below is stolen from Fefes example libowfat httpd.
*/
/* System */
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <pwd.h>
/* Libowfat */
#include "socket.h"
#include "io.h"
#include "iob.h"
#include "array.h"
#include "fmt.h"
#include "scan.h"
#include "ip4.h"
/* Opentracker */
#include "trackerlogic.h"
#include "ot_iovec.h"
#include "ot_mutex.h"
#include "ot_http.h"
#include "ot_udp.h"
#include "ot_clean.h"
#include "ot_accesslist.h"
#include "ot_stats.h"
/* Globals */
time_t g_now;
char * g_redirecturl = NULL;
/* To always have space for error messages ;) */
static char static_inbuf[8192];
static char *FLAG_TCP = "T";
static char *FLAG_UDP = "U";
static void panic( const char *routine ) {
fprintf( stderr, "%s: %s\n", routine, strerror(errno) );
exit( 111 );
}
static void signal_handler( int s ) {
if( s == SIGINT ) {
signal( SIGINT, SIG_IGN);
trackerlogic_deinit();
exit( 0 );
} else if( s == SIGALRM ) {
g_now = time(NULL);
alarm(5);
}
}
static void usage( char *name ) {
fprintf( stderr, "Usage: %s [-i ip] [-p port] [-P port] [-r redirect] [-d dir] [-A ip]"
#ifdef WANT_BLACKLISTING
" [-b blacklistfile]"
#elif defined ( WANT_CLOSED_TRACKER )
" [-w whitelistfile]"
#endif
"\n", name );
}
#define HELPLINE(opt,desc) fprintf(stderr, "\t%-10s%s\n",opt,desc)
static void help( char *name ) {
usage( name );
HELPLINE("-i ip","specify ip to bind to (default: *, you may specify more than one)");
HELPLINE("-p port","specify tcp port to bind to (default: 6969, you may specify more than one)");
HELPLINE("-P port","specify udp port to bind to (default: 6969, you may specify more than one)");
HELPLINE("-r redirecturl","specify url where / should be redirected to (default none)");
HELPLINE("-d dir","specify directory to try to chroot to (default: \".\")");
HELPLINE("-A ip","bless an ip address as admin address (e.g. to allow syncs from this address)");
#ifdef WANT_BLACKLISTING
HELPLINE("-b file","specify blacklist file.");
#elif defined( WANT_CLOSED_TRACKER )
HELPLINE("-w file","specify whitelist file.");
#endif
fprintf( stderr, "\nExample: ./opentracker -i 127.0.0.1 -p 6969 -P 6969 -i 10.1.1.23 -p 2710 -p 80\n" );
}
#undef HELPLINE
static void handle_dead( const int64 socket ) {
struct http_data* h=io_getcookie( socket );
if( h ) {
if( h->flag & STRUCT_HTTP_FLAG_IOB_USED )
iob_reset( &h->batch );
if( h->flag & STRUCT_HTTP_FLAG_ARRAY_USED )
array_reset( &h->request );
if( h->flag & STRUCT_HTTP_FLAG_WAITINGFORTASK )
mutex_workqueue_canceltask( socket );
free( h );
}
io_close( socket );
}
static ssize_t handle_read( const int64 clientsocket ) {
struct http_data* h = io_getcookie( clientsocket );
ssize_t l;
if( ( l = io_tryread( clientsocket, static_inbuf, sizeof static_inbuf ) ) <= 0 ) {
handle_dead( clientsocket );
return 0;
}
/* If we get the whole request in one packet, handle it without copying */
if( !array_start( &h->request ) ) {
if( memchr( static_inbuf, '\n', l ) )
return http_handle_request( clientsocket, static_inbuf, l );
h->flag |= STRUCT_HTTP_FLAG_ARRAY_USED;
array_catb( &h->request, static_inbuf, l );
return 0;
}
h->flag |= STRUCT_HTTP_FLAG_ARRAY_USED;
array_catb( &h->request, static_inbuf, l );
if( array_failed( &h->request ) )
return http_issue_error( clientsocket, CODE_HTTPERROR_500 );
if( ( array_bytes( &h->request ) > 8192 ) && !accesslist_isblessed( (char*)&h->ip, OT_PERMISSION_MAY_SYNC ) )
return http_issue_error( clientsocket, CODE_HTTPERROR_500 );
if( memchr( array_start( &h->request ), '\n', array_bytes( &h->request ) ) )
return http_handle_request( clientsocket, array_start( &h->request ), array_bytes( &h->request ) );
return 0;
}
static void handle_write( const int64 clientsocket ) {
struct http_data* h=io_getcookie( clientsocket );
if( !h || ( iob_send( clientsocket, &h->batch ) <= 0 ) )
handle_dead( clientsocket );
}
static void handle_accept( const int64 serversocket ) {
struct http_data *h;
unsigned char ip[4];
uint16 port;
tai6464 t;
int64 i;
while( ( i = socket_accept4( serversocket, (char*)ip, &port) ) != -1 ) {
/* Put fd into a non-blocking mode */
io_nonblock( i );
if( !io_fd( i ) ||
!( h = (struct http_data*)malloc( sizeof( struct http_data ) ) ) ) {
io_close( i );
continue;
}
io_setcookie( i, h );
io_wantread( i );
memset( h, 0, sizeof( struct http_data ) );
memmove( h->ip, ip, sizeof( ip ) );
stats_issue_event( EVENT_ACCEPT, 1, 0);
/* That breaks taia encapsulation. But there is no way to take system
time this often in FreeBSD and libowfat does not allow to set unix time */
taia_uint( &t, 0 ); /* Clear t */
tai_unix( &(t.sec), (g_now + OT_CLIENT_TIMEOUT) );
io_timeout( i, t );
}
if( errno == EAGAIN )
io_eagain( serversocket );
}
static void server_mainloop( ) {
static time_t ot_last_clean_time;
time_t next_timeout_check = g_now + OT_CLIENT_TIMEOUT_CHECKINTERVAL;
struct iovec *iovector;
int iovec_entries;
for( ; ; ) {
int64 i;
io_wait();
while( ( i = io_canread( ) ) != -1 ) {
const void *cookie = io_getcookie( i );
if( cookie == FLAG_TCP )
handle_accept( i );
else if( cookie == FLAG_UDP )
handle_udp4( i );
else
handle_read( i );
}
while( ( i = mutex_workqueue_popresult( &iovec_entries, &iovector ) ) != -1 )
http_sendiovecdata( i, iovec_entries, iovector );
while( ( i = io_canwrite( ) ) != -1 )
handle_write( i );
if( g_now > next_timeout_check ) {
while( ( i = io_timeouted() ) != -1 )
handle_dead( i );
next_timeout_check = g_now + OT_CLIENT_TIMEOUT_CHECKINTERVAL;
}
/* See if we need to move our pools */
if( NOW != ot_last_clean_time ) {
ot_last_clean_time = NOW;
clean_all_torrents();
}
/* Enforce setting the clock */
signal_handler( SIGALRM );
}
}
static void ot_try_bind( char ip[4], uint16 port, int is_tcp ) {
int64 s = is_tcp ? socket_tcp4( ) : socket_udp4();
if( socket_bind4_reuse( s, ip, port ) == -1 )
panic( "socket_bind4_reuse" );
if( is_tcp && ( socket_listen( s, SOMAXCONN) == -1 ) )
panic( "socket_listen" );
if( !io_fd( s ) )
panic( "io_fd" );
io_setcookie( s, is_tcp ? FLAG_TCP : FLAG_UDP );
io_wantread( s );
}
int main( int argc, char **argv ) {
struct passwd *pws = NULL;
char serverip[4] = {0,0,0,0}, tmpip[4];
char *serverdir = ".";
int bound = 0, scanon = 1;
#ifdef WANT_ACCESS_CONTROL
char *accesslist_filename = NULL;
#endif
while( scanon ) {
switch( getopt( argc, argv, ":i:p:A:P:d:r:"
#ifdef WANT_BLACKLISTING
"b:"
#elif defined( WANT_CLOSED_TRACKER )
"w:"
#endif
"h" ) ) {
case -1 : scanon = 0; break;
case 'i': scan_ip4( optarg, serverip ); break;
#ifdef WANT_BLACKLISTING
case 'b': accesslist_filename = optarg; break;
#elif defined( WANT_CLOSED_TRACKER )
case 'w': accesslist_filename = optarg; break;
#endif
case 'p': ot_try_bind( serverip, (uint16)atol( optarg ), 1 ); bound++; break;
case 'P': ot_try_bind( serverip, (uint16)atol( optarg ), 0 ); bound++; break;
case 'd': serverdir = optarg; break;
case 'r': g_redirecturl = optarg; break;
case 'A':
scan_ip4( optarg, tmpip );
accesslist_blessip( tmpip, 0xffff ); /* Allow everything for now */
break;
case 'h': help( argv[0] ); exit( 0 );
default:
case '?': usage( argv[0] ); exit( 1 );
}
}
/* Bind to our default tcp/udp ports */
if( !bound) {
ot_try_bind( serverip, 6969, 1 );
ot_try_bind( serverip, 6969, 0 );
}
/* Drop permissions */
pws = getpwnam( "nobody" );
if( !pws ) {
setegid( (gid_t)-2 ); setuid( (uid_t)-2 );
setgid( (gid_t)-2 ); seteuid( (uid_t)-2 );
} else {
setegid( pws->pw_gid ); setuid( pws->pw_uid );
setgid( pws->pw_gid ); seteuid( pws->pw_uid );
}
endpwent();
accesslist_init( accesslist_filename );
signal( SIGPIPE, SIG_IGN );
signal( SIGINT, signal_handler );
signal( SIGALRM, signal_handler );
g_now = time( NULL );
if( trackerlogic_init( serverdir ) == -1 )
panic( "Logic not started" );
alarm(5);
server_mainloop( );
return 0;
}