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transmission/libtransmission/announcer-http.c

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/*
* This file Copyright (C) Mnemosyne LLC
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
#include <limits.h> /* USHRT_MAX */
#include <stdio.h> /* fprintf() */
#include <stdlib.h> /* getenv() */
#include <string.h> /* strchr(), memcmp(), memcpy() */
#include <event2/buffer.h>
#include <event2/http.h> /* for HTTP_OK */
#define __LIBTRANSMISSION_ANNOUNCER_MODULE___
#include "transmission.h"
#include "announcer-common.h"
#include "net.h" /* tr_globalIPv6() */
#include "peer-mgr.h" /* pex */
#include "torrent.h"
#include "trevent.h" /* tr_runInEventThread() */
#include "utils.h"
#include "web.h" /* tr_http_escape() */
#define dbgmsg( name, ... ) \
if( tr_deepLoggingIsActive( ) ) do { \
tr_deepLog( __FILE__, __LINE__, name, __VA_ARGS__ ); \
} while( 0 )
/****
*****
***** ANNOUNCE
*****
****/
static const char*
get_event_string( const tr_announce_request * req )
{
if( req->partial_seed )
if( req->event != TR_ANNOUNCE_EVENT_STOPPED )
return "paused";
return tr_announce_event_get_string( req->event );
}
static struct evbuffer *
announce_url_new( const tr_session * session, const tr_announce_request * req )
{
const char * str;
const unsigned char * ipv6;
struct evbuffer * buf = evbuffer_new( );
char escaped_info_hash[SHA_DIGEST_LENGTH*3 + 1];
tr_http_escape_sha1( escaped_info_hash, req->info_hash );
evbuffer_expand( buf, 1024 );
evbuffer_add_printf( buf, "%s"
"%c"
"info_hash=%s"
"&peer_id=%*.*s"
"&port=%d"
"&uploaded=%" PRIu64
"&downloaded=%" PRIu64
"&left=%" PRIu64
"&numwant=%d"
"&key=%x"
"&compact=1"
"&supportcrypto=1",
req->url,
strchr( req->url, '?' ) ? '&' : '?',
escaped_info_hash,
PEER_ID_LEN, PEER_ID_LEN, req->peer_id,
req->port,
req->up,
req->down,
req->left,
req->numwant,
req->key );
if( session->encryptionMode == TR_ENCRYPTION_REQUIRED )
evbuffer_add_printf( buf, "&requirecrypto=1" );
if( req->corrupt )
evbuffer_add_printf( buf, "&corrupt=%" PRIu64, req->corrupt );
str = get_event_string( req );
if( str && *str )
evbuffer_add_printf( buf, "&event=%s", str );
str = req->tracker_id_str;
if( str && *str )
evbuffer_add_printf( buf, "&trackerid=%s", str );
/* There are two incompatible techniques for announcing an IPv6 address.
BEP-7 suggests adding an "ipv6=" parameter to the announce URL,
while OpenTracker requires that peers announce twice, once over IPv4
and once over IPv6.
To be safe, we should do both: add the "ipv6=" parameter and
announce twice. At any rate, we're already computing our IPv6
address (for the LTEP handshake), so this comes for free. */
ipv6 = tr_globalIPv6( );
if( ipv6 ) {
char ipv6_readable[INET6_ADDRSTRLEN];
evutil_inet_ntop( AF_INET6, ipv6, ipv6_readable, INET6_ADDRSTRLEN );
evbuffer_add_printf( buf, "&ipv6=");
tr_http_escape( buf, ipv6_readable, -1, true );
}
return buf;
}
static tr_pex*
listToPex( tr_benc * peerList, size_t * setme_len )
{
size_t i;
size_t n;
const size_t len = tr_bencListSize( peerList );
tr_pex * pex = tr_new0( tr_pex, len );
for( i=n=0; i<len; ++i )
{
int64_t port;
const char * ip;
tr_address addr;
tr_benc * peer = tr_bencListChild( peerList, i );
if( peer == NULL )
continue;
if( !tr_bencDictFindStr( peer, "ip", &ip ) )
continue;
if( !tr_address_from_string( &addr, ip ) )
continue;
if( !tr_bencDictFindInt( peer, "port", &port ) )
continue;
if( ( port < 0 ) || ( port > USHRT_MAX ) )
continue;
if( !tr_address_is_valid_for_peers( &addr, port ) )
continue;
pex[n].addr = addr;
pex[n].port = htons( (uint16_t)port );
++n;
}
*setme_len = n;
return pex;
}
struct announce_data
{
tr_announce_response response;
tr_announce_response_func * response_func;
void * response_func_user_data;
char log_name[128];
};
static void
on_announce_done_eventthread( void * vdata )
{
struct announce_data * data = vdata;
if( data->response_func != NULL )
data->response_func( &data->response, data->response_func_user_data );
tr_free( data->response.pex6 );
tr_free( data->response.pex );
tr_free( data->response.tracker_id_str );
tr_free( data->response.warning );
tr_free( data->response.errmsg );
tr_free( data );
}
static void
on_announce_done( tr_session * session,
bool did_connect,
bool did_timeout,
long response_code,
const void * msg,
size_t msglen,
void * vdata )
{
tr_announce_response * response;
struct announce_data * data = vdata;
response = &data->response;
response->did_connect = did_connect;
response->did_timeout = did_timeout;
dbgmsg( data->log_name, "Got announce response" );
if( response_code != HTTP_OK )
{
const char * fmt = _( "Tracker gave HTTP response code %1$ld (%2$s)" );
const char * response_str = tr_webGetResponseStr( response_code );
response->errmsg = tr_strdup_printf( fmt, response_code, response_str );
}
else
{
tr_benc benc;
const int benc_loaded = !tr_bencLoad( msg, msglen, &benc, NULL );
if( getenv( "TR_CURL_VERBOSE" ) != NULL )
{
if( !benc_loaded )
fprintf( stderr, "%s", "Announce response was not in benc format\n" );
else {
int i, len;
char * str = tr_bencToStr( &benc, TR_FMT_JSON, &len );
fprintf( stderr, "%s", "Announce response:\n< " );
for( i=0; i<len; ++i )
fputc( str[i], stderr );
fputc( '\n', stderr );
tr_free( str );
}
}
if( benc_loaded && tr_bencIsDict( &benc ) )
{
int64_t i;
size_t rawlen;
tr_benc * tmp;
const char * str;
const uint8_t * raw;
if( tr_bencDictFindStr( &benc, "failure reason", &str ) )
response->errmsg = tr_strdup( str );
if( tr_bencDictFindStr( &benc, "warning message", &str ) )
response->warning = tr_strdup( str );
if( tr_bencDictFindInt( &benc, "interval", &i ) )
response->interval = i;
if( tr_bencDictFindInt( &benc, "min interval", &i ) )
response->min_interval = i;
if( tr_bencDictFindStr( &benc, "tracker id", &str ) )
response->tracker_id_str = tr_strdup( str );
if( tr_bencDictFindInt( &benc, "complete", &i ) )
response->seeders = i;
if( tr_bencDictFindInt( &benc, "incomplete", &i ) )
response->leechers = i;
if( tr_bencDictFindInt( &benc, "downloaded", &i ) )
response->downloads = i;
if( tr_bencDictFindRaw( &benc, "peers6", &raw, &rawlen ) ) {
dbgmsg( data->log_name, "got a peers6 length of %zu", rawlen );
response->pex6 = tr_peerMgrCompact6ToPex( raw, rawlen,
NULL, 0, &response->pex6_count );
}
if( tr_bencDictFindRaw( &benc, "peers", &raw, &rawlen ) ) {
dbgmsg( data->log_name, "got a compact peers length of %zu", rawlen );
response->pex = tr_peerMgrCompactToPex( raw, rawlen,
NULL, 0, &response->pex_count );
} else if( tr_bencDictFindList( &benc, "peers", &tmp ) ) {
response->pex = listToPex( tmp, &response->pex_count );
dbgmsg( data->log_name, "got a peers list with %zu entries",
response->pex_count );
}
}
if( benc_loaded )
tr_bencFree( &benc );
}
tr_runInEventThread( session, on_announce_done_eventthread, data );
}
void
tr_tracker_http_announce( tr_session * session,
const tr_announce_request * request,
tr_announce_response_func response_func,
void * response_func_user_data )
{
struct announce_data * d;
struct evbuffer * buf = announce_url_new( session, request );
const char * url = (const char *) evbuffer_pullup( buf, -1 );
d = tr_new0( struct announce_data, 1 );
d->response.seeders = -1;
d->response.leechers = -1;
d->response.downloads = -1;
d->response_func = response_func;
d->response_func_user_data = response_func_user_data;
memcpy( d->response.info_hash, request->info_hash, SHA_DIGEST_LENGTH );
tr_strlcpy( d->log_name, request->log_name, sizeof( d->log_name ) );
dbgmsg( request->log_name, "Sending announce to libcurl: \"%s\"", url );
tr_webRun( session, url, NULL, NULL, on_announce_done, d );
evbuffer_free( buf );
}
/****
*****
***** SCRAPE
*****
****/
struct scrape_data
{
tr_scrape_response response;
tr_scrape_response_func * response_func;
void * response_func_user_data;
char log_name[128];
};
static void
on_scrape_done_eventthread( void * vdata )
{
struct scrape_data * data = vdata;
if( data->response_func != NULL )
data->response_func( &data->response, data->response_func_user_data );
tr_free( data->response.errmsg );
tr_free( data->response.url );
tr_free( data );
}
static void
on_scrape_done( tr_session * session,
bool did_connect,
bool did_timeout,
long response_code,
const void * msg,
size_t msglen,
void * vdata )
{
tr_scrape_response * response;
struct scrape_data * data = vdata;
response = &data->response;
response->did_connect = did_connect;
response->did_timeout = did_timeout;
dbgmsg( data->log_name, "Got scrape response for \"%s\"", response->url );
if( response_code != HTTP_OK )
{
const char * fmt = _( "Tracker gave HTTP response code %1$ld (%2$s)" );
const char * response_str = tr_webGetResponseStr( response_code );
response->errmsg = tr_strdup_printf( fmt, response_code, response_str );
}
else
{
tr_benc top;
int64_t intVal;
tr_benc * files;
tr_benc * flags;
const char * str;
const int benc_loaded = !tr_bencLoad( msg, msglen, &top, NULL );
if( getenv( "TR_CURL_VERBOSE" ) != NULL )
{
if( !benc_loaded )
fprintf( stderr, "%s", "Scrape response was not in benc format\n" );
else {
int i, len;
char * str = tr_bencToStr( &top, TR_FMT_JSON, &len );
fprintf( stderr, "%s", "Scrape response:\n< " );
for( i=0; i<len; ++i )
fputc( str[i], stderr );
fputc( '\n', stderr );
tr_free( str );
}
}
if( benc_loaded )
{
if( tr_bencDictFindStr( &top, "failure reason", &str ) )
response->errmsg = tr_strdup( str );
if( tr_bencDictFindDict( &top, "flags", &flags ) )
if( tr_bencDictFindInt( flags, "min_request_interval", &intVal ) )
response->min_request_interval = intVal;
if( tr_bencDictFindDict( &top, "files", &files ) )
{
int i = 0;
for( ;; )
{
int j;
tr_benc * val;
const char * key;
/* get the next "file" */
if( !tr_bencDictChild( files, i++, &key, &val ) )
break;
/* populate the corresponding row in our response array */
for( j=0; j<response->row_count; ++j )
{
struct tr_scrape_response_row * row = &response->rows[j];
if( !memcmp( key, row->info_hash, SHA_DIGEST_LENGTH ) )
{
if( tr_bencDictFindInt( val, "complete", &intVal ) )
row->seeders = intVal;
if( tr_bencDictFindInt( val, "incomplete", &intVal ) )
row->leechers = intVal;
if( tr_bencDictFindInt( val, "downloaded", &intVal ) )
row->downloads = intVal;
if( tr_bencDictFindInt( val, "downloaders", &intVal ) )
row->downloaders = intVal;
break;
}
}
}
}
tr_bencFree( &top );
}
}
tr_runInEventThread( session, on_scrape_done_eventthread, data );
}
static struct evbuffer *
scrape_url_new( const tr_scrape_request * req )
{
int i;
char delimiter;
struct evbuffer * buf = evbuffer_new( );
evbuffer_add_printf( buf, "%s", req->url );
delimiter = strchr( req->url, '?' ) ? '&' : '?';
for( i=0; i<req->info_hash_count; ++i )
{
char str[SHA_DIGEST_LENGTH*3 + 1];
tr_http_escape_sha1( str, req->info_hash[i] );
evbuffer_add_printf( buf, "%cinfo_hash=%s", delimiter, str );
delimiter = '&';
}
return buf;
}
void
tr_tracker_http_scrape( tr_session * session,
const tr_scrape_request * request,
tr_scrape_response_func response_func,
void * response_func_user_data )
{
int i;
struct scrape_data * d;
struct evbuffer * buf = scrape_url_new( request );
const char * url = (const char *) evbuffer_pullup( buf, -1 );
d = tr_new0( struct scrape_data, 1 );
d->response.url = tr_strdup( request->url );
d->response_func = response_func;
d->response_func_user_data = response_func_user_data;
d->response.row_count = request->info_hash_count;
for( i=0; i<d->response.row_count; ++i )
{
memcpy( d->response.rows[i].info_hash, request->info_hash[i], SHA_DIGEST_LENGTH );
d->response.rows[i].seeders = -1;
d->response.rows[i].leechers = -1;
d->response.rows[i].downloads = -1;
}
tr_strlcpy( d->log_name, request->log_name, sizeof( d->log_name ) );
dbgmsg( request->log_name, "Sending scrape to libcurl: \"%s\"", url );
tr_webRun( session, url, NULL, NULL, on_scrape_done, d );
evbuffer_free( buf );
}
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