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.
*/
#include "socket.h"
#include "io.h"
#include "buffer.h"
#include "ip6.h"
#include "array.h"
#include "case.h"
#include "fmt.h"
#include "iob.h"
#include "str.h"
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include "trackerlogic.h"
#include "scan_urlencoded_query.h"
static unsigned int ot_overall_connections = 0;
static time_t ot_start_time;
static const unsigned int SUCCESS_HTTP_HEADER_LENGTH = 80;
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 {
array r;
io_batch iob;
unsigned long ip;
};
int header_complete(struct http_data* r)
{
long i;
long l = array_bytes(&r->r);
const char* c = array_start(&r->r);
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;
}
void httperror(struct http_data* h,const char* title,const char* message)
{
char* c = (char*)malloc(strlen(message)+strlen(title)+200);
if( !c) iob_addbuf(&h->iob, "HTTP/1.0 500 internal error\r\nContent-Type: text/plain\r\nConnection: close\r\n\r\nout of memory\n", 90);
else iob_addbuf_free( &h->iob, c,
sprintf( c, "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) );
}
// bestimmten http parameter auslesen und adresse zurueckgeben
const char* http_header(struct http_data* r,const char* h)
{
long i;
long l = array_bytes(&r->r);
long 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;
}
void httpresponse(struct http_data* h,int64 s)
{
char *c, *data, *reply = NULL;
ot_peer peer;
ot_torrent *torrent;
ot_hash *hash = NULL;
int numwant, tmp, scanon;
unsigned short port = htons(6881);
size_t reply_size = 0;
array_cat0(&h->r);
c = array_start(&h->r);
if (byte_diff(c,4,"GET ")) {
e400:
httperror(h,"400 Invalid Request","This server only understands GET.");
goto bailout;
}
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 ) )
{
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 */
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 */
switch( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE ) ) {
case -1:
goto e404;
case 20:
hash = (ot_hash*)data; /* Fall through intended */
default:
continue;
}
default:
scan_urlencoded_query( &c, NULL, SCAN_SEARCHPATH_VALUE );
break;
}
}
/* Scanned whole query string, wo */
if( !hash ) {
httperror(h,"400 Invalid Request","This server only serves specific scrapes.");
goto bailout;
}
// Enough for http header + whole scrape string
reply = malloc( SUCCESS_HTTP_HEADER_LENGTH + 128 );
if( reply )
reply_size = return_scrape_for_torrent( hash, SUCCESS_HTTP_HEADER_LENGTH + reply );
if( !reply || ( reply_size < 0 ) ) {
if( reply ) free( reply );
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 */
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 e404;
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 e404;
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 ) || scan_fixed_int( data, len, &tmp ) ) goto e404;
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 e404;
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 e404;
} 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 e404;
if( !tmp ) {
httperror(h,"400 Invalid Request","This server only delivers compact results.");
goto bailout;
}
} else
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 */
switch( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE ) ) {
case -1:
goto e404;
case 20:
hash = (ot_hash*)data;
default: // Fall through intended
continue;
}
default:
scan_urlencoded_query( &c, NULL, SCAN_SEARCHPATH_VALUE );
break;
}
}
/* Scanned whole query string */
if( !hash ) goto e404;
if( OT_FLAG( &peer ) & PEER_FLAG_STOPPED ) {
remove_peer_from_torrent( hash, &peer );
reply = malloc( SUCCESS_HTTP_HEADER_LENGTH + 26 );
if( !reply )
goto e500;
MEMMOVE( reply + SUCCESS_HTTP_HEADER_LENGTH, "d15:warning message4:Okaye", reply_size = 26 );
} else {
torrent = add_peer_to_torrent( hash, &peer );
if( !torrent ) {
e500:
httperror(h,"500 Internal Server Error","A server error has occured. Please retry later.");
goto bailout;
}
reply = malloc( SUCCESS_HTTP_HEADER_LENGTH + numwant * 6 + 128 ); // http header + peerlist + seeder, peers and lametta 80 + n*6+81 a.t.m.
if( reply )
reply_size = return_peers_for_torrent( torrent, numwant, SUCCESS_HTTP_HEADER_LENGTH + reply );
if( !reply || ( reply_size <= 0 ) ) {
if( reply ) free( reply );
goto e500;
}
}
break;
case 11:
if( byte_diff(data,11,"mrtg_scrape"))
goto e404;
reply = malloc( SUCCESS_HTTP_HEADER_LENGTH + 128 );
{
unsigned long seconds_elapsed = time( NULL ) - ot_start_time;
reply_size = sprintf( reply + SUCCESS_HTTP_HEADER_LENGTH,
"%d\n%d\nUp: %ld seconds (%ld hours)\nPretuned by german engineers, currently handling %li connections per second.",
ot_overall_connections, ot_overall_connections, seconds_elapsed,
seconds_elapsed / 3600, ot_overall_connections / ( seconds_elapsed ? seconds_elapsed : 1 ) );
}
break;
default: /* neither *scrape nor announce */
e404:
httperror(h,"404 Not Found","No such file or directory.");
goto bailout;
}
if( reply && reply_size ) {
MEMMOVE( reply, "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\nContent-Length: X \r\n\r\n", SUCCESS_HTTP_HEADER_LENGTH );
fmt_ulonglong( reply+59, (long long)reply_size );
iob_addbuf_free(&h->iob, reply, SUCCESS_HTTP_HEADER_LENGTH + reply_size );
}
bailout:
io_dontwantread(s);
shutdown(s, SHUT_RD );
io_wantwrite(s);
reply_size=iob_send(s,&h->iob);
if (reply_size==-1) {
io_eagain(s);
} else
if ((reply_size<=0)||(h->iob.bytesleft==0))
{
array_reset(&h->r);
iob_reset(&h->iob);
free(h);
shutdown(s, SHUT_RDWR);
io_close(s);
}
}
void graceful( int s ) {
if( s == SIGINT ) {
signal( SIGINT, SIG_IGN);
deinit_logic();
exit( 0 );
}
}
int main()
{
int s=socket_tcp4();
unsigned long ip;
uint16 port;
ot_start_time = time( NULL );
if (socket_bind4_reuse(s,NULL,6969)==-1)
panic("socket_bind4_reuse");
if (socket_listen(s,16)==-1)
panic("socket_listen");
if (!io_fd(s))
panic("io_fd");
signal( SIGINT, graceful );
if( init_logic( ) == -1 )
panic("Logic not started");
io_wantread(s);
for (;;)
{
int64 i;
io_wait();
while ((i=io_canread())!=-1)
{
if (i==s) // ist es der serversocket?
{
int n;
while ((n=socket_accept4(s,(void*)&ip,&port))!=-1)
{
if (io_fd(n))
{
struct http_data* h=(struct http_data*)malloc(sizeof(struct http_data));
io_wantread(n);
if (h)
{
byte_zero(h,sizeof(struct http_data));
h->ip=ip;
io_setcookie(n,h);
++ot_overall_connections;
} else
io_close(n);
} else
io_close(n);
}
if (errno==EAGAIN)
io_eagain(s);
else
carp("socket_accept4");
}
else
{
char buf[8192];
struct http_data* h=io_getcookie(i);
int l=io_tryread(i,buf,sizeof buf);
if (l<=0)
{
if (h)
{
array_reset(&h->r);
iob_reset(&h->iob);
free(h);
}
io_close(i);
}
else
{
array_catb(&h->r,buf,l);
if (array_failed(&h->r))
{
httperror(h,"500 Server Error","request too long.");
emerge:
io_dontwantread(i);
io_wantwrite(i);
}
else if (array_bytes(&h->r)>8192)
{
httperror(h,"500 request too long","You sent too much headers");
goto emerge;
}
else if ((l=header_complete(h)))
{
httpresponse(h,i);
}
}
}
}
while ((i=io_canwrite())!=-1)
{
struct http_data* h=io_getcookie(i);
int64 r=iob_send(i,&h->iob);
if (r==-1)
io_eagain(i);
else
if ((r<=0)||(h->iob.bytesleft==0))
{
array_reset(&h->r);
iob_reset(&h->iob);
free(h);
shutdown(i, SHUT_RDWR);
io_close(i);
}
}
}
return 0;
}