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.
$Id: opentracker.c,v 1.202 2008/11/28 22:21:09 erdgeist Exp $ */
/* System */
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <pwd.h>
#include <ctype.h>
/* Libowfat */
#include "socket.h"
#include "io.h"
#include "iob.h"
#include "byte.h"
#include "scan.h"
#include "ip4.h"
/* Opentracker */
#include "trackerlogic.h"
#include "ot_mutex.h"
#include "ot_http.h"
#include "ot_udp.h"
#include "ot_accesslist.h"
#include "ot_stats.h"
#include "ot_livesync.h"
/* Globals */
time_t g_now_seconds;
char * g_redirecturl = NULL;
uint32_t g_tracker_id;
static char * g_serverdir = NULL;
/* To always have space for error messages ;) */
static char static_inbuf[8192];
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_seconds = 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] [-f config] [-s livesyncport]"
#ifdef WANT_ACCESSLIST_BLACK
" [-b blacklistfile]"
#elif defined ( WANT_ACCESSLIST_WHITE )
" [-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("-f config","include and execute the config file");
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_ACCESSLIST_BLACK
HELPLINE("-b file","specify blacklist file.");
#elif defined( WANT_ACCESSLIST_WHITE )
HELPLINE("-w file","specify whitelist file.");
#endif
fprintf( stderr, "\nExample: ./opentracker -i 127.0.0.1 -p 6969 -P 6969 -f ./opentracker.conf -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 )
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, FLAG_TCP, ntohl(*(uint32_t*)ip));
/* 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_seconds + OT_CLIENT_TIMEOUT) );
io_timeout( i, t );
}
if( errno == EAGAIN )
io_eagain( serversocket );
}
static void server_mainloop( ) {
time_t next_timeout_check = g_now_seconds + 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( (int)cookie == FLAG_TCP )
handle_accept( i );
else if( (int)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_seconds > next_timeout_check ) {
while( ( i = io_timeouted() ) != -1 )
handle_dead( i );
next_timeout_check = g_now_seconds + OT_CLIENT_TIMEOUT_CHECKINTERVAL;
}
livesync_ticker();
/* Enforce setting the clock */
signal_handler( SIGALRM );
}
}
static int64_t ot_try_bind( char ip[4], uint16_t port, PROTO_FLAG proto ) {
int64 s = proto == FLAG_TCP ? socket_tcp4( ) : socket_udp4();
#ifdef _DEBUG
char *protos[] = {"TCP","UDP","UDP mcast"};
uint8_t *_ip = (uint8_t *)ip;
fprintf( stderr, "Binding socket type %s to address %d.%d.%d.%d:%d...", protos[proto],_ip[0],_ip[1],_ip[2],_ip[3],port);
#endif
if( socket_bind4_reuse( s, ip, port ) == -1 )
panic( "socket_bind4_reuse" );
if( ( proto == FLAG_TCP ) && ( socket_listen( s, SOMAXCONN) == -1 ) )
panic( "socket_listen" );
if( !io_fd( s ) )
panic( "io_fd" );
io_setcookie( s, (void*)proto );
io_wantread( s );
#ifdef _DEBUG
fputs( " success.\n", stderr);
#endif
return s;
}
char * set_config_option( char **option, char *value ) {
#ifdef _DEBUG
fprintf( stderr, "Setting config option: %s\n", value );
#endif
while( isspace(*value) ) ++value;
free( *option );
return *option = strdup( value );
}
static int scan_ip4_port( const char *src, char *ip, uint16 *port ) {
const char *s = src;
int off;
while( isspace(*s) ) ++s;
if( !(off = scan_ip4( s, ip ) ) )
return 0;
s += off;
if( *s == 0 || isspace(*s)) return s-src;
if( *(s++) != ':' )
return 0;
if( !(off = scan_ushort (s, port ) ) )
return 0;
return off+s-src;
}
int parse_configfile( char * config_filename ) {
FILE * accesslist_filehandle;
char inbuf[512], tmpip[4];
int bound = 0;
accesslist_filehandle = fopen( config_filename, "r" );
if( accesslist_filehandle == NULL ) {
fprintf( stderr, "Warning: Can't open config file: %s.", config_filename );
return 0;
}
while( fgets( inbuf, sizeof(inbuf), accesslist_filehandle ) ) {
char *newl;
char *p = inbuf;
/* Skip white spaces */
while(isspace(*p)) ++p;
/* Ignore comments and empty lines */
if((*p=='#')||(*p=='\n')||(*p==0)) continue;
/* chomp */
if(( newl = strchr(p, '\n' ))) *newl = 0;
/* Scan for commands */
if(!byte_diff(p,15,"tracker.rootdir" ) && isspace(p[15])) {
set_config_option( &g_serverdir, p+16 );
} else if(!byte_diff(p,14,"listen.tcp_udp" ) && isspace(p[14])) {
uint16_t tmpport = 6969;
if( !scan_ip4_port( p+15, tmpip, &tmpport )) goto parse_error;
ot_try_bind( tmpip, tmpport, FLAG_TCP ); ++bound;
ot_try_bind( tmpip, tmpport, FLAG_UDP ); ++bound;
} else if(!byte_diff(p,10,"listen.tcp" ) && isspace(p[10])) {
uint16_t tmpport = 6969;
if( !scan_ip4_port( p+11, tmpip, &tmpport )) goto parse_error;
ot_try_bind( tmpip, tmpport, FLAG_TCP );
++bound;
} else if(!byte_diff(p, 10, "listen.udp" ) && isspace(p[10])) {
uint16_t tmpport = 6969;
if( !scan_ip4_port( p+11, tmpip, &tmpport )) goto parse_error;
ot_try_bind( tmpip, tmpport, FLAG_UDP );
++bound;
#ifdef WANT_ACCESSLIST_WHITE
} else if(!byte_diff(p, 16, "access.whitelist" ) && isspace(p[16])) {
set_config_option( &g_accesslist_filename, p+17 );
#elif defined( WANT_ACCESSLIST_BLACK )
} else if(!byte_diff(p, 16, "access.blacklist" ) && isspace(p[16])) {
set_config_option( &g_accesslist_filename, p+17 );
#endif
#ifdef WANT_RESTRICT_STATS
} else if(!byte_diff(p, 12, "access.stats" ) && isspace(p[12])) {
if( !scan_ip4( p+13, tmpip )) goto parse_error;
accesslist_blessip( tmpip, OT_PERMISSION_MAY_STAT );
#endif
} else if(!byte_diff(p, 20, "tracker.redirect_url" ) && isspace(p[20])) {
set_config_option( &g_redirecturl, p+21 );
#ifdef WANT_SYNC_LIVE
} else if(!byte_diff(p, 24, "livesync.cluster.node_ip" ) && isspace(p[24])) {
if( !scan_ip4( p+25, tmpip )) goto parse_error;
accesslist_blessip( tmpip, OT_PERMISSION_MAY_LIVESYNC );
} else if(!byte_diff(p, 23, "livesync.cluster.listen" ) && isspace(p[23])) {
uint16_t tmpport = LIVESYNC_PORT;
if( !scan_ip4_port( p+24, tmpip, &tmpport )) goto parse_error;
livesync_bind_mcast( tmpip, tmpport );
#endif
} else
fprintf( stderr, "Unhandled line in config file: %s\n", inbuf );
continue;
parse_error:
fprintf( stderr, "Parse error in config file: %s\n", inbuf);
}
fclose( accesslist_filehandle );
return bound;
}
int main( int argc, char **argv ) {
struct passwd *pws = NULL;
char serverip[4] = {0,0,0,0}, tmpip[4];
int bound = 0, scanon = 1;
uint16_t tmpport;
while( scanon ) {
switch( getopt( argc, argv, ":i:p:A:P:d:r:s:f:v"
#ifdef WANT_ACCESSLIST_BLACK
"b:"
#elif defined( WANT_ACCESSLIST_WHITE )
"w:"
#endif
"h" ) ) {
case -1 : scanon = 0; break;
case 'i':
if( !scan_ip4( optarg, serverip )) { usage( argv[0] ); exit( 1 ); }
break;
#ifdef WANT_ACCESSLIST_BLACK
case 'b': set_config_option( &g_accesslist_filename, optarg); break;
#elif defined( WANT_ACCESSLIST_WHITE )
case 'w': set_config_option( &g_accesslist_filename, optarg); break;
#endif
case 'p':
if( !scan_ushort( optarg, &tmpport)) { usage( argv[0] ); exit( 1 ); }
ot_try_bind( serverip, tmpport, FLAG_TCP ); bound++; break;
case 'P':
if( !scan_ushort( optarg, &tmpport)) { usage( argv[0] ); exit( 1 ); }
ot_try_bind( serverip, tmpport, FLAG_UDP ); bound++; break;
#ifdef WANT_SYNC_LIVE
case 's':
if( !scan_ushort( optarg, &tmpport)) { usage( argv[0] ); exit( 1 ); }
livesync_bind_mcast( serverip, tmpport); break;
#endif
case 'd': set_config_option( &g_serverdir, optarg ); break;
case 'r': set_config_option( &g_redirecturl, optarg ); break;
case 'A':
if( !scan_ip4( optarg, tmpip )) { usage( argv[0] ); exit( 1 ); }
accesslist_blessip( tmpip, 0xffff ); /* Allow everything for now */
break;
case 'f': bound += parse_configfile( optarg ); break;
case 'h': help( argv[0] ); exit( 0 );
case 'v': stats_return_tracker_version( static_inbuf ); fputs( static_inbuf, stderr ); exit( 0 );
default:
case '?': usage( argv[0] ); exit( 1 );
}
}
/* Bind to our default tcp/udp ports */
if( !bound) {
ot_try_bind( serverip, 6969, FLAG_TCP );
ot_try_bind( serverip, 6969, FLAG_UDP );
}
/* 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();
signal( SIGPIPE, SIG_IGN );
signal( SIGINT, signal_handler );
signal( SIGALRM, signal_handler );
g_now_seconds = time( NULL );
if( trackerlogic_init( g_serverdir ? g_serverdir : "." ) == -1 )
panic( "Logic not started" );
alarm(5);
server_mainloop( );
return 0;
}
const char *g_version_opentracker_c = "$Source: /home/cvsroot/opentracker/opentracker.c,v $: $Revision: 1.202 $\n";