An open and free bittorrent tracker https://erdgeist.org/gitweb/opentracker
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#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 <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include "trackerlogic.h"
#include "scan_urlencoded_query.h"
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;
char* hdrbuf;
int hlen;
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* r,const char* title,const char* message)
{
char* c;
c=r->hdrbuf=(char*)malloc(strlen(message)+strlen(title)+200);
if (!c)
{
r->hdrbuf="HTTP/1.0 500 internal error\r\nContent-Type: text/plain\r\nConnection: close\r\n\r\nout of memory\n";
r->hlen=strlen(r->hdrbuf);
}
else
{
c+=fmt_str(c,"HTTP/1.0 ");
c+=fmt_str(c,title);
c+=fmt_str(c,"\r\nContent-Type: text/html\r\nConnection: close\r\nContent-Length: ");
c+=fmt_ulong(c,strlen(message)+strlen(title)+16-4);
c+=fmt_str(c,"\r\n\r\n<title>");
c+=fmt_str(c,title+4);
c+=fmt_str(c,"</title>\n");
r->hlen=c - r->hdrbuf;
}
iob_addbuf(&r->iob,r->hdrbuf,r->hlen);
}
// 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, *d, *data, *reply = NULL;
struct ot_peer peer;
ot_torrent torrent;
ot_hash *hash = NULL;
unsigned long numwant;
int compact, scanon;
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 (d=c; *d!=' '&&*d!='\t'&&*d!='\n'&&*d!='\r'; ++d) ;
if (*d!=' ') goto e400;
*d=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;
break;
case 8:
if( byte_diff(data,8,"announce"))
goto e404;
peer.ip = h->ip;
peer.port_flags = 6881 << 16;
numwant = 50;
compact = 1;
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 4:
if(!byte_diff(data,4,"port"))
/* scan int */ c;
else if(!byte_diff(data,4,"left"))
/* scan int */ c;
else
scan_urlencoded_query( &c, NULL, SCAN_SEARCHPATH_VALUE );
break;
case 7:
if(!byte_diff(data,7,"numwant"))
/* scan int */ c;
else if(!byte_diff(data,7,"compact"))
/* scan flag */ c;
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; /* Fall through intended */
printf("hash: %s\n",*hash);
default:
continue;
}
default:
scan_urlencoded_query( &c, NULL, SCAN_SEARCHPATH_VALUE );
break;
}
}
/* Scanned whole query string */
if( !hash || ( compact == 0 ) ) goto e404;
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( numwant*6+24 );
if( reply )
reply_size = return_peers_for_torrent( torrent, numwant, reply );
if( !reply || ( reply_size < 0 ) ) {
if( reply ) free( reply );
goto e500;
}
break;
default: /* neither scrape nor announce */
e404:
httperror(h,"404 Not Found","No such file or directory.");
goto bailout;
}
c=h->hdrbuf=(char*)malloc(500);
c+=fmt_str(c,"HTTP/1.1 200 OK\r\nContent-Type: text/plain");
c+=fmt_str(c,"\r\nContent-Length: ");
c+=fmt_ulonglong(c, reply_size );
c+=fmt_str(c,"\r\nLast-Modified: ");
c+=fmt_httpdate(c,time(0));
c+=fmt_str(c,"\r\nConnection: close\r\n\r\n");
iob_addbuf(&h->iob,h->hdrbuf,c - h->hdrbuf);
if( reply && reply_size ) iob_addbuf(&h->iob,reply, reply_size );
bailout:
io_dontwantread(s);
io_wantwrite(s);
}
void graceful( int s ) {
if( s == SIGINT ) {
signal( SIGINT, SIG_IGN);
deinit_logic();
exit( 0 );
}
}
int main()
{
int s=socket_tcp4();
uint32 scope_id;
unsigned long ip;
uint16 port;
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);
} else
io_close(n);
} else
io_close(n);
buffer_putnlflush(buffer_2);
}
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->hdrbuf); h->hdrbuf=0;
}
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)
{
array_trunc(&h->r);
iob_reset(&h->iob);
free(h->hdrbuf); h->hdrbuf=0;
io_close(i);
}
}
}
return 0;
}