An open and free bittorrent tracker https://erdgeist.org/gitweb/opentracker
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

658 lines
19 KiB

16 years ago
/* 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.
*/
16 years ago
#include "socket.h"
#include "io.h"
#include "iob.h"
16 years ago
#include "buffer.h"
#include "array.h"
#include "byte.h"
16 years ago
#include "case.h"
#include "fmt.h"
#include "str.h"
#include <string.h>
16 years ago
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
16 years ago
#include <arpa/inet.h>
16 years ago
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
16 years ago
#include "trackerlogic.h"
#include "scan_urlencoded_query.h"
unsigned int const OT_CLIENT_TIMEOUT = 30;
unsigned int const OT_CLIENT_TIMEOUT_CHECKINTERVAL = 5;
static unsigned int ot_overall_connections = 0;
static unsigned int ot_overall_successfulannounces = 0;
static time_t ot_start_time;
static const size_t SUCCESS_HTTP_HEADER_LENGTH = 80;
static const size_t SUCCESS_HTTP_SIZE_OFF = 17;
/* To always have space for error messages ;) */
static char static_scratch[8192];
#ifdef _DEBUG_FDS
static char fd_debug_space[0x10000];
#endif
#ifdef _DEBUG_HTTPERROR
static char debug_request[8192];
#endif
16 years ago
static void carp(const char* routine) {
buffer_puts(buffer_2,routine);
buffer_puts(buffer_2,": ");
buffer_puterror(buffer_2);
buffer_putnlflush(buffer_2);
}
static void panic(const char* routine) {
carp(routine);
exit(111);
}
struct http_data {
union {
array r;
io_batch batch;
};
unsigned char ip[4];
16 years ago
};
int header_complete(struct http_data* r) {
int l = array_bytes(&r->r), i;
const char* c = array_start(&r->r);
16 years ago
for (i=0; i+1<l; ++i) {
if (c[i]=='\n' && c[i+1]=='\n') return i+2;
if (i+3<l && c[i]=='\r' && c[i+1]=='\n' && c[i+2]=='\r' && c[i+3]=='\n') return i+4;
}
return 0;
}
16 years ago
void sendmallocdata( int64 s, struct http_data *h, char * buffer, size_t size ) {
tai6464 t;
char *header;
size_t header_size;
if( !h ) { free( buffer); return; }
array_reset(&h->r);
header = malloc( SUCCESS_HTTP_HEADER_LENGTH );
if( !header ) { free( buffer ); return; }
header_size = sprintf( header, "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\nContent-Length: %zd\r\n\r\n", size );
iob_reset( &h->batch );
iob_addbuf_free( &h->batch, header, header_size );
iob_addbuf_free( &h->batch, buffer, size );
// writeable sockets just have a tcp timeout
taia_uint(&t,0); io_timeout( s, t );
io_dontwantread( s );
io_wantwrite( s );
}
/* whoever sends data is not interested in its input-array */
void senddata(int64 s, struct http_data* h, char *buffer, size_t size ) {
size_t written_size;
if( h ) array_reset(&h->r);
written_size = write( s, buffer, size );
if( ( written_size < 0 ) || ( written_size == size ) ) {
#ifdef _DEBUG_FDS
if( !fd_debug_space[s] ) fprintf( stderr, "close on non-open fd\n" );
fd_debug_space[s] = 0;
#endif
free(h); io_close( s );
} else {
char * outbuf = malloc( size - written_size );
tai6464 t;
if( !outbuf ) {
#ifdef _DEBUG_FDS
if( !fd_debug_space[s] ) fprintf( stderr, "close on non-open fd\n" );
fd_debug_space[s] = 0;
#endif
free(h); io_close( s );
return;
}
iob_reset( &h->batch );
memmove( outbuf, buffer + written_size, size - written_size );
iob_addbuf_free( &h->batch, outbuf, size - written_size );
// writeable sockets just have a tcp timeout
taia_uint(&t,0); io_timeout( s, t );
io_dontwantread( s );
io_wantwrite( s );
}
16 years ago
}
void httperror(int64 s,struct http_data* h,const char* title,const char* message) {
size_t reply_size = sprintf( static_scratch, "HTTP/1.0 %s\r\nContent-Type: text/html\r\nConnection: close\r\nContent-Length: %zd\r\n\r\n<title>%s</title>\n",
title, strlen(message)+strlen(title)+16-4,title+4);
#ifdef _DEBUG_HTTPERROR
fprintf( stderr, "DEBUG: invalid request was: %s\n", debug_request );
#endif
senddata(s,h,static_scratch,reply_size);
16 years ago
}
const char* http_header(struct http_data* r,const char* h) {
int i, l = array_bytes(&r->r);
int sl = strlen(h);
const char* c = array_start(&r->r);
for (i=0; i+sl+2<l; ++i) {
if (c[i]=='\n' && case_equalb(c+i+1,sl,h) && c[i+sl+1]==':') {
c+=i+sl+1;
if (*c==' ' || *c=='\t') ++c;
return c;
}
return 0;
}
return 0;
16 years ago
}
void httpresponse(int64 s,struct http_data* h)
16 years ago
{
char *c, *data;
ot_peer peer;
ot_torrent *torrent;
ot_hash *hash = NULL;
int numwant, tmp, scanon, mode;
unsigned short port = htons(6881);
size_t reply_size = 0;
array_cat0(&h->r);
c = array_start(&h->r);
#ifdef _DEBUG_HTTPERROR
memcpy( debug_request, array_start(&h->r), array_bytes(&h->r) );
#endif
if (byte_diff(c,4,"GET ")) {
16 years ago
e400:
return httperror(s,h,"400 Invalid Request","This server only understands GET.");
}
16 years ago
c+=4;
for (data=c; *data!=' '&&*data!='\t'&&*data!='\n'&&*data!='\r'; ++data) ;
if (*data!=' ') goto e400;
*data=0;
if (c[0]!='/') goto e404;
while (*c=='/') ++c;
switch( scan_urlencoded_query( &c, data = c, SCAN_PATH ) ) {
16 years ago
case 5: /* scrape ? */
if (byte_diff(data,5,"stats"))
goto e404;
scanon = 1;
mode = STATS_MRTG;
while( scanon ) {
switch( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_PARAM ) ) {
case -2: /* terminator */
scanon = 0;
break;
case -1: /* error */
goto e404;
case 4:
if(byte_diff(data,4,"mode")) {
scan_urlencoded_query( &c, NULL, SCAN_SEARCHPATH_VALUE );
continue;
}
size_t len = scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE );
if( len <= 0 ) goto e400_param;
if( !byte_diff(data,4,"mrtg"))
mode = STATS_MRTG;
else if( !byte_diff(data,4,"top5"))
mode = STATS_TOP5;
else
goto e400_param;
default:
scan_urlencoded_query( &c, NULL, SCAN_SEARCHPATH_VALUE );
break;
}
}
16 years ago
/* Enough for http header + whole scrape string */
if( ( reply_size = return_stats_for_tracker( SUCCESS_HTTP_HEADER_LENGTH + static_scratch, mode ) ) <= 0 )
16 years ago
goto e500;
break;
case 6: /* scrape ? */
if (byte_diff(data,6,"scrape"))
goto e404;
scanon = 1;
while( scanon ) {
switch( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_PARAM ) ) {
case -2: /* terminator */
scanon = 0;
break;
case -1: /* error */
16 years ago
goto e404;
case 9:
if(byte_diff(data,9,"info_hash")) {
scan_urlencoded_query( &c, NULL, SCAN_SEARCHPATH_VALUE );
continue;
}
/* ignore this, when we have less than 20 bytes */
if( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE ) != 20 ) {
e400_param:
return httperror(s,h,"400 Invalid Request","Invalid parameter");
}
hash = (ot_hash*)data; /* Fall through intended */
break;
default:
scan_urlencoded_query( &c, NULL, SCAN_SEARCHPATH_VALUE );
break;
}
}
/* Scanned whole query string, no hash means full scrape... you might want to limit that */
if( hash ) {
char * reply;
reply_size = return_fullscrape_for_tracker( &reply );
if( reply_size )
return sendmallocdata( s, h, reply, reply_size );
goto e500;
} else {
/* Enough for http header + whole scrape string */
if( ( reply_size = return_scrape_for_torrent( hash, SUCCESS_HTTP_HEADER_LENGTH + static_scratch ) ) <= 0 )
goto e500;
}
break;
case 8:
if( byte_diff(data,8,"announce"))
goto e404;
OT_SETIP( &peer, h->ip);
OT_SETPORT( &peer, &port );
OT_FLAG( &peer ) = 0;
numwant = 50;
scanon = 1;
while( scanon ) {
switch( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_PARAM ) ) {
case -2: /* terminator */
scanon = 0;
break;
case -1: /* error */
16 years ago
goto e404;
#ifdef WANT_IP_FROM_QUERY_STRING
case 2:
if(!byte_diff(data,2,"ip")) {
size_t len = scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE );
unsigned char ip[4];
if( ( len <= 0 ) || scan_fixed_ip( data, len, ip ) ) goto e400_param;
OT_SETIP ( &peer, ip );
} else
scan_urlencoded_query( &c, NULL, SCAN_SEARCHPATH_VALUE );
break;
#endif
case 4:
if(!byte_diff(data,4,"port")) {
size_t len = scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE );
if( ( len <= 0 ) || scan_fixed_int( data, len, &tmp ) || ( tmp > 0xffff ) ) goto e400_param;
port = htons( tmp ); OT_SETPORT ( &peer, &port );
} else if(!byte_diff(data,4,"left")) {
size_t len = scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE );
if( len <= 0 ) goto e400_param;
if( scan_fixed_int( data, len, &tmp ) ) tmp = 0;
if( !tmp ) OT_FLAG( &peer ) |= PEER_FLAG_SEEDING;
} else
scan_urlencoded_query( &c, NULL, SCAN_SEARCHPATH_VALUE );
break;
case 5:
if(byte_diff(data,5,"event"))
scan_urlencoded_query( &c, NULL, SCAN_SEARCHPATH_VALUE );
else switch( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE ) ) {
case -1:
goto e400_param;
case 7:
if(!byte_diff(data,7,"stopped")) OT_FLAG( &peer ) |= PEER_FLAG_STOPPED;
break;
case 9:
if(!byte_diff(data,9,"complete")) OT_FLAG( &peer ) |= PEER_FLAG_COMPLETED;
default: /* Fall through intended */
break;
}
break;
case 7:
if(!byte_diff(data,7,"numwant")) {
size_t len = scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE );
if( ( len <= 0 ) || scan_fixed_int( data, len, &numwant ) ) goto e400_param;
if( numwant > 200 ) numwant = 200;
} else if(!byte_diff(data,7,"compact")) {
size_t len = scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE );
if( ( len <= 0 ) || scan_fixed_int( data, len, &tmp ) ) goto e400_param;
if( !tmp )
return httperror(s,h,"400 Invalid Request","This server only delivers compact results.");
} else
16 years ago
scan_urlencoded_query( &c, NULL, SCAN_SEARCHPATH_VALUE );
break;
case 9:
if(byte_diff(data,9,"info_hash")) {
scan_urlencoded_query( &c, NULL, SCAN_SEARCHPATH_VALUE );
continue;
}
/* ignore this, when we have less than 20 bytes */
if( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE ) != 20 )
goto e400;
hash = (ot_hash*)data;
break;
default:
scan_urlencoded_query( &c, NULL, SCAN_SEARCHPATH_VALUE );
break;
16 years ago
}
}
/* Scanned whole query string */
if( !hash ) goto e400;
if( OT_FLAG( &peer ) & PEER_FLAG_STOPPED ) {
remove_peer_from_torrent( hash, &peer );
16 years ago
memmove( static_scratch + SUCCESS_HTTP_HEADER_LENGTH, "d8:completei0e10:incompletei0e8:intervali1800e5:peers0:e", reply_size = 56 );
} else {
torrent = add_peer_to_torrent( hash, &peer );
if( !torrent ) {
e500:
return httperror(s,h,"500 Internal Server Error","A server error has occured. Please retry later.");
}
if( ( reply_size = return_peers_for_torrent( torrent, numwant, SUCCESS_HTTP_HEADER_LENGTH + static_scratch ) ) <= 0 )
goto e500;
}
ot_overall_successfulannounces++;
break;
case 11:
if( byte_diff(data,11,"mrtg_scrape"))
goto e404;
{
time_t seconds_elapsed = time( NULL ) - ot_start_time;
reply_size = sprintf( static_scratch + SUCCESS_HTTP_HEADER_LENGTH,
"%i\n%i\nUp: %i seconds (%i hours)\nPretuned by german engineers, currently handling %i connections per second.",
ot_overall_connections, ot_overall_successfulannounces, (int)seconds_elapsed,
(int)(seconds_elapsed / 3600), (int)ot_overall_connections / ( (int)seconds_elapsed ? (int)seconds_elapsed : 1 ) );
}
break;
default: /* neither *scrape nor announce */
e404:
return httperror(s,h,"404 Not Found","No such file or directory.");
}
if( reply_size ) {
/* This one is rather ugly, so I take you step by step through it.
1. In order to avoid having two buffers, one for header and one for content, we allow all above functions from trackerlogic to
write to a fixed location, leaving SUCCESS_HTTP_HEADER_LENGTH bytes in our static buffer, which is enough for the static string
plus dynamic space needed to expand our Content-Length value. We reserve SUCCESS_HTTP_SIZE_OFF for it expansion and calculate
the space NOT needed to expand in reply_off
*/
size_t reply_off = SUCCESS_HTTP_SIZE_OFF - snprintf( static_scratch, 0, "%zd", reply_size );
/* 2. Now we sprintf our header so that sprintf writes its terminating '\0' exactly one byte before content starts. Complete
packet size is increased by size of header plus one byte '\n', we will copy over '\0' in next step */
reply_size += 1 + sprintf( static_scratch + reply_off, "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\nContent-Length: %zd\r\n\r", reply_size );
/* 3. Finally we join both blocks neatly */
static_scratch[ SUCCESS_HTTP_HEADER_LENGTH - 1 ] = '\n';
senddata( s, h, static_scratch + reply_off, reply_size );
} else {
if( h ) array_reset(&h->r);
#ifdef _DEBUG_FDS
if( !fd_debug_space[s] ) fprintf( stderr, "close on non-open fd\n" );
fd_debug_space[s] = 0;
#endif
free( h ); io_close( s );
}
16 years ago
}
void graceful( int s ) {
if( s == SIGINT ) {
signal( SIGINT, SIG_IGN);
deinit_logic();
exit( 0 );
}
}
#ifdef _DEBUG_FDS
void count_fds( int s ) {
int i, count = 0;
for( i=0; i<sizeof(fd_debug_space); ++i )
if( fd_debug_space[i] ) ++count;
fprintf( stderr, "Open fds here: %i\n", count );
}
#endif
void usage( char *name ) {
fprintf( stderr, "Usage: %s [-i serverip] [-p serverport] [-d serverdirectory]"
#ifdef WANT_CLOSED_TRACKER
16 years ago
" [-oc]"
#endif
#ifdef WANT_BLACKLIST
" [-bB]"
#endif
"\n", name );
16 years ago
}
void help( char *name ) {
usage( name );
fprintf( stderr, "\t-i serverip\tspecify ip to bind to (default: *)\n"
"\t-p serverport\tspecify port to bind to (default: 6969)\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
);
}
void handle_read( int64 clientsocket ) {
struct http_data* h = io_getcookie( clientsocket );
int l = io_tryread( clientsocket, static_scratch, sizeof static_scratch );
if( l <= 0 ) {
if( h ) {
array_reset(&h->r);
free(h);
}
#ifdef _DEBUG_FDS
if( !fd_debug_space[clientsocket] ) fprintf( stderr, "close on non-open fd\n" );
fd_debug_space[clientsocket] = 0;
#endif
io_close(clientsocket);
return;
}
array_catb(&h->r,static_scratch,l);
#ifdef _DEBUG_HTTPERROR
memcpy( debug_request, "500!\0", 5 );
#endif
if( array_failed(&h->r))
httperror(clientsocket,h,"500 Server Error","Request too long.");
else if (array_bytes(&h->r)>8192)
httperror(clientsocket,h,"500 request too long","You sent too much headers");
else if ((l=header_complete(h)))
httpresponse(clientsocket,h);
}
void handle_write( int64 clientsocket ) {
struct http_data* h=io_getcookie(clientsocket);
if( !h ) return;
if( iob_send( clientsocket, &h->batch ) <= 0 ) {
iob_reset( &h->batch );
#ifdef _DEBUG_FDS
if( !fd_debug_space[clientsocket] ) fprintf( stderr, "close on non-open fd\n" );
fd_debug_space[clientsocket] = 0;
#endif
io_close( clientsocket );
free( h );
}
}
void handle_accept( 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 ) {
if( !io_fd( i ) ||
!(h = (struct http_data*)malloc(sizeof(struct http_data))) ) {
io_close( i );
continue;
}
#ifdef _DEBUG_FDS
if( fd_debug_space[i] ) fprintf( stderr, "double use of fd: %i\n", (int)i );
fd_debug_space[i] = 1;
#endif
io_wantread( i );
byte_zero(h,sizeof(struct http_data));
memmove(h->ip,ip,sizeof(ip));
io_setcookie(i,h);
++ot_overall_connections;
taia_now(&t);
taia_addsec(&t,&t,OT_CLIENT_TIMEOUT);
io_timeout(i,t);
}
if( errno==EAGAIN )
io_eagain( serversocket );
/*
else
carp( "socket_accept4" );
*/
}
void handle_timeouted( ) {
int64 i;
while( ( i = io_timeouted() ) != -1 ) {
struct http_data* h=io_getcookie(i);
if( h ) {
array_reset( &h->r );
free( h );
}
#ifdef _DEBUG_FDS
if( !fd_debug_space[i] ) fprintf( stderr, "close on non-open fd\n" );
fd_debug_space[i] = 0;
#endif
io_close(i);
}
}
void server_mainloop( int64 serversocket ) {
tai6464 t, next_timeout_check;
io_wantread( serversocket );
taia_now( &next_timeout_check );
for (;;) {
int64 i;
taia_now(&t);
taia_addsec(&t,&t,OT_CLIENT_TIMEOUT_CHECKINTERVAL);
io_waituntil(t);
while( ( i = io_canread() ) != -1 ) {
if( i == serversocket )
handle_accept( i );
else
handle_read( i );
}
while( ( i = io_canwrite() ) != -1 )
handle_write( i );
taia_now(&t);
if( taia_less( &next_timeout_check, &t ) ) {
handle_timeouted( );
taia_now(&next_timeout_check);
taia_addsec(&next_timeout_check,&next_timeout_check,OT_CLIENT_TIMEOUT_CHECKINTERVAL);
}
}
}
int main( int argc, char **argv ) {
int64 s = socket_tcp4( );
char *serverip = NULL;
char *serverdir = ".";
uint16 port = 6969;
int scanon = 1;
while( scanon ) {
switch( getopt(argc,argv,":i:p:d:ocbBh") ) {
case -1 : scanon = 0; break;
case 'i': serverip = optarg; break;
case 'p': port = (uint16)atol( optarg ); 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;
16 years ago
#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);
}
}
if (socket_bind4_reuse(s,serverip,port)==-1)
panic("socket_bind4_reuse");
setegid((gid_t)-2); setuid((uid_t)-2);
setgid((gid_t)-2); seteuid((uid_t)-2);
if (socket_listen(s,SOMAXCONN)==-1)
panic("socket_listen");
if (!io_fd(s))
panic("io_fd");
signal( SIGPIPE, SIG_IGN );
signal( SIGINT, graceful );
#ifdef _DEBUG_FDS
signal( SIGINFO, count_fds );
#endif
if( init_logic( serverdir ) == -1 )
panic("Logic not started");
ot_start_time = time( NULL );
server_mainloop(s);
return 0;
16 years ago
}