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transmission/libtransmission/web.c

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/*
* This file Copyright (C) 2008-2009 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 <curl/curl.h>
#include <event.h>
#include <assert.h>
#include "transmission.h"
#include "net.h"
#include "session.h"
#include "trevent.h"
#include "utils.h"
#include "version.h"
#include "web.h"
enum
{
TR_MEMORY_TRASH = 0xCC,
DEFAULT_TIMER_MSEC = 1500 /* arbitrary */
};
#if 0
#define dbgmsg(...) \
do { \
fprintf( stderr, __VA_ARGS__ ); \
fprintf( stderr, "\n" ); \
} while( 0 )
#else
#define dbgmsg( ... ) \
do { \
if( tr_deepLoggingIsActive( ) ) \
tr_deepLog( __FILE__, __LINE__, "web", __VA_ARGS__ ); \
} while( 0 )
#endif
struct tr_web
{
tr_bool closing;
tr_bool haveAddr;
int taskCount;
long timer_msec;
CURLM * multi;
tr_session * session;
tr_address addr;
struct event timer_event;
};
static void
web_free( tr_web * g )
{
curl_multi_cleanup( g->multi );
evtimer_del( &g->timer_event );
memset( g, TR_MEMORY_TRASH, sizeof( struct tr_web ) );
tr_free( g );
}
/***
****
***/
struct tr_web_task
{
unsigned long tag;
struct evbuffer * response;
char * url;
char * range;
tr_session * session;
tr_web_done_func * done_func;
void * done_func_user_data;
};
static void
task_free( struct tr_web_task * task )
{
evbuffer_free( task->response );
tr_free( task->range );
tr_free( task->url );
memset( task, TR_MEMORY_TRASH, sizeof( struct tr_web_task ) );
tr_free( task );
}
/***
****
***/
static size_t
writeFunc( void * ptr, size_t size, size_t nmemb, void * vtask )
{
const size_t byteCount = size * nmemb;
struct tr_web_task * task = vtask;
evbuffer_add( task->response, ptr, byteCount );
dbgmsg( "wrote %zu bytes to task %p's buffer", byteCount, task );
return byteCount;
}
static int
sockoptfunction( void * vtask, curl_socket_t fd, curlsocktype purpose UNUSED )
{
struct tr_web_task * task = vtask;
const tr_bool isScrape = strstr( task->url, "scrape" ) != NULL;
const tr_bool isAnnounce = strstr( task->url, "announce" ) != NULL;
/* announce and scrape requests have tiny payloads...
* which have very small payloads */
if( isScrape || isAnnounce )
{
const int sndbuf = 1024;
const int rcvbuf = isScrape ? 2048 : 3072;
setsockopt( fd, SOL_SOCKET, SO_SNDBUF, &sndbuf, sizeof(sndbuf) );
setsockopt( fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, sizeof(rcvbuf) );
}
/* return nonzero if this function encountered an error */
return 0;
}
static int
getCurlProxyType( tr_proxy_type t )
{
if( t == TR_PROXY_SOCKS4 ) return CURLPROXY_SOCKS4;
if( t == TR_PROXY_SOCKS5 ) return CURLPROXY_SOCKS5;
return CURLPROXY_HTTP;
}
static int
getTimeoutFromURL( const char * url )
{
if( strstr( url, "scrape" ) != NULL ) return 20;
if( strstr( url, "announce" ) != NULL ) return 30;
return 240;
}
static void
addTask( void * vtask )
{
struct tr_web_task * task = vtask;
const tr_session * session = task->session;
if( session && session->web )
{
CURL * e = curl_easy_init( );
struct tr_web * web = session->web;
const long timeout = getTimeoutFromURL( task->url );
const long verbose = getenv( "TR_CURL_VERBOSE" ) != NULL;
const char * user_agent = TR_NAME "/" LONG_VERSION_STRING;
dbgmsg( "adding task #%lu [%s]", task->tag, task->url );
if( !task->range && session->isProxyEnabled ) {
curl_easy_setopt( e, CURLOPT_PROXY, session->proxy );
curl_easy_setopt( e, CURLOPT_PROXYAUTH, CURLAUTH_ANY );
curl_easy_setopt( e, CURLOPT_PROXYPORT, session->proxyPort );
curl_easy_setopt( e, CURLOPT_PROXYTYPE,
getCurlProxyType( session->proxyType ) );
}
if( !task->range && session->isProxyAuthEnabled ) {
char * str = tr_strdup_printf( "%s:%s", session->proxyUsername,
session->proxyPassword );
curl_easy_setopt( e, CURLOPT_PROXYUSERPWD, str );
tr_free( str );
}
curl_easy_setopt( e, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4 );
curl_easy_setopt( e, CURLOPT_TIMEOUT, timeout );
curl_easy_setopt( e, CURLOPT_CONNECTTIMEOUT, timeout-5 );
curl_easy_setopt( e, CURLOPT_SOCKOPTFUNCTION, sockoptfunction );
curl_easy_setopt( e, CURLOPT_SOCKOPTDATA, task );
curl_easy_setopt( e, CURLOPT_WRITEDATA, task );
curl_easy_setopt( e, CURLOPT_WRITEFUNCTION, writeFunc );
curl_easy_setopt( e, CURLOPT_DNS_CACHE_TIMEOUT, 1800L );
curl_easy_setopt( e, CURLOPT_FOLLOWLOCATION, 1L );
curl_easy_setopt( e, CURLOPT_AUTOREFERER, 1L );
curl_easy_setopt( e, CURLOPT_FORBID_REUSE, 1L );
curl_easy_setopt( e, CURLOPT_MAXREDIRS, -1L );
curl_easy_setopt( e, CURLOPT_NOSIGNAL, 1L );
curl_easy_setopt( e, CURLOPT_PRIVATE, task );
curl_easy_setopt( e, CURLOPT_SSL_VERIFYHOST, 0L );
curl_easy_setopt( e, CURLOPT_SSL_VERIFYPEER, 0L );
curl_easy_setopt( e, CURLOPT_URL, task->url );
curl_easy_setopt( e, CURLOPT_USERAGENT, user_agent );
curl_easy_setopt( e, CURLOPT_VERBOSE, verbose );
if( web->haveAddr )
curl_easy_setopt( e, CURLOPT_INTERFACE, tr_ntop_non_ts( &web->addr ) );
if( task->range )
curl_easy_setopt( e, CURLOPT_RANGE, task->range );
if( curl_multi_add_handle( web->multi, e ) == CURLM_OK )
++web->taskCount;
}
}
/***
****
***/
static void
task_finish( struct tr_web_task * task, long response_code )
{
dbgmsg( "finished web task %lu; got %ld", task->tag, response_code );
if( task->done_func != NULL )
task->done_func( task->session,
response_code,
EVBUFFER_DATA( task->response ),
EVBUFFER_LENGTH( task->response ),
task->done_func_user_data );
task_free( task );
}
static void
remove_finished_tasks( tr_web * g )
{
CURLMsg * msg;
int msgs_left;
while(( msg = curl_multi_info_read( g->multi, &msgs_left ))) {
if(( msg->msg == CURLMSG_DONE ) && ( msg->easy_handle != NULL )) {
long code;
struct tr_web_task * task;
CURL * e = msg->easy_handle;
curl_easy_getinfo( e, CURLINFO_PRIVATE, (void*)&task );
curl_easy_getinfo( e, CURLINFO_RESPONSE_CODE, &code );
curl_multi_remove_handle( g->multi, e );
curl_easy_cleanup( e );
task_finish( task, code );
}
}
}
static void
restart_timer( tr_web * g )
{
dbgmsg( "adding a timeout for %.1f seconds from now", g->timer_msec/1000.0 );
evtimer_del( &g->timer_event );
tr_timerAddMsec( &g->timer_event, g->timer_msec );
}
static void
tr_multi_perform( tr_web * g, int fd, int curl_what )
{
CURLMcode mcode;
dbgmsg( "check_run_count: %d taskCount", g->taskCount );
/* invoke libcurl's processing */
do
mcode = curl_multi_socket_action( g->multi, fd, curl_what, &g->taskCount );
while( mcode == CURLM_CALL_MULTI_SOCKET );
remove_finished_tasks( g );
if( g->closing && !g->taskCount )
web_free( g );
else
restart_timer( g );
}
/* libevent says that sock is ready to be processed, so wake up libcurl */
static void
event_cb( int fd, short ev_what, void * g )
{
int curl_what = 0;
if( ev_what & EV_READ ) curl_what |= CURL_POLL_IN;
if( ev_what & EV_WRITE ) curl_what |= CURL_POLL_OUT;
tr_multi_perform( g, fd, curl_what );
}
/* CURLMOPT_SOCKETFUNCTION */
static int
sock_cb( CURL * e UNUSED, curl_socket_t fd, int action,
void * vweb, void * vevent )
{
/*static int num_events = 0;*/
struct tr_web * web = vweb;
struct event * io_event = vevent;
dbgmsg( "sock_cb: action %d, fd %d, io_event %p", action, (int)fd, io_event );
if( ( action == CURL_POLL_NONE ) || ( action & CURL_POLL_REMOVE ) )
{
if( io_event != NULL )
{
event_del( io_event );
#ifndef SYS_DARWIN
tr_free( io_event );
#else
#warning FIXME - OS X
#endif
curl_multi_assign( web->multi, fd, NULL );
/*fprintf( stderr, "-1 io_events to %d\n", --num_events );*/
}
}
else if( action & ( CURL_POLL_IN | CURL_POLL_OUT ) )
{
const short events = EV_PERSIST
| (( action & CURL_POLL_IN ) ? EV_READ : 0 )
| (( action & CURL_POLL_OUT ) ? EV_WRITE : 0 );
if( io_event != NULL )
event_del( io_event );
else {
io_event = tr_new0( struct event, 1 );
curl_multi_assign( web->multi, fd, io_event );
/*fprintf( stderr, "+1 io_events to %d\n", ++num_events );*/
}
dbgmsg( "enabling (libevent %hd, libcurl %d) polling on io_event %p, fd %d",
events, action, io_event, fd );
event_set( io_event, fd, events, event_cb, web );
event_add( io_event, NULL );
}
else assert( 0 && "unhandled action" );
return 0; /* libcurl documentation: "The callback MUST return 0." */
}
/* libevent says that timer_msec have passed, so wake up libcurl */
static void
libevent_timer_cb( int fd UNUSED, short what UNUSED, void * vg )
{
tr_web * g = vg;
dbgmsg( "libevent timer is done" );
tr_multi_perform( g, CURL_SOCKET_TIMEOUT, 0 );
}
/* libcurl documentation: "If 0, it means you should proceed immediately
* without waiting for anything. If it returns -1, there's no timeout at all
* set ... (but) you must not wait too long (more than a few seconds perhaps)
* before you call curl_multi_perform() again." */
static void
multi_timer_cb( CURLM * multi UNUSED, long timer_msec, void * vg )
{
tr_web * g = vg;
g->timer_msec = timer_msec > 0 ? timer_msec : DEFAULT_TIMER_MSEC;
if( timer_msec < 1 )
tr_multi_perform( g, CURL_SOCKET_TIMEOUT, 0 );
}
/****
*****
****/
void
tr_webRun( tr_session * session,
const char * url,
const char * range,
tr_web_done_func done_func,
void * done_func_user_data )
{
if( session->web != NULL )
{
static unsigned long tag = 0;
struct tr_web_task * task = tr_new0( struct tr_web_task, 1 );
task->session = session;
task->url = tr_strdup( url );
task->range = tr_strdup( range );
task->done_func = done_func;
task->done_func_user_data = done_func_user_data;
task->tag = ++tag;
task->response = evbuffer_new( );
tr_runInEventThread( session, addTask, task );
}
}
void
tr_webSetInterface( tr_web * web, const tr_address * addr )
{
if(( web->haveAddr = ( addr != NULL )))
web->addr = *addr;
}
tr_web*
tr_webInit( tr_session * session )
{
tr_web * web;
/* try to enable ssl for https support; but if that fails,
* try a plain vanilla init */
if( curl_global_init( CURL_GLOBAL_SSL ) )
curl_global_init( 0 );
web = tr_new0( struct tr_web, 1 );
web->session = session;
web->timer_msec = DEFAULT_TIMER_MSEC; /* overwritten by multi_timer_cb() */
evtimer_set( &web->timer_event, libevent_timer_cb, web );
web->multi = curl_multi_init( );
curl_multi_setopt( web->multi, CURLMOPT_SOCKETDATA, web );
curl_multi_setopt( web->multi, CURLMOPT_SOCKETFUNCTION, sock_cb );
curl_multi_setopt( web->multi, CURLMOPT_TIMERDATA, web );
curl_multi_setopt( web->multi, CURLMOPT_TIMERFUNCTION, multi_timer_cb );
return web;
}
void
tr_webClose( tr_web ** web_in )
{
tr_web * web = *web_in;
*web_in = NULL;
if( web->taskCount < 1 )
web_free( web );
else
web->closing = 1;
}
/*****
******
******
*****/
const char *
tr_webGetResponseStr( long code )
{
switch( code )
{
case 0: return "No Response";
case 101: return "Switching Protocols";
case 200: return "OK";
case 201: return "Created";
case 202: return "Accepted";
case 203: return "Non-Authoritative Information";
case 204: return "No Content";
case 205: return "Reset Content";
case 206: return "Partial Content";
case 300: return "Multiple Choices";
case 301: return "Moved Permanently";
case 302: return "Found";
case 303: return "See Other";
case 304: return "Not Modified";
case 305: return "Use Proxy";
case 306: return "(Unused)";
case 307: return "Temporary Redirect";
case 400: return "Bad Request";
case 401: return "Unauthorized";
case 402: return "Payment Required";
case 403: return "Forbidden";
case 404: return "Not Found";
case 405: return "Method Not Allowed";
case 406: return "Not Acceptable";
case 407: return "Proxy Authentication Required";
case 408: return "Request Timeout";
case 409: return "Conflict";
case 410: return "Gone";
case 411: return "Length Required";
case 412: return "Precondition Failed";
case 413: return "Request Entity Too Large";
case 414: return "Request-URI Too Long";
case 415: return "Unsupported Media Type";
case 416: return "Requested Range Not Satisfiable";
case 417: return "Expectation Failed";
case 500: return "Internal Server Error";
case 501: return "Not Implemented";
case 502: return "Bad Gateway";
case 503: return "Service Unavailable";
case 504: return "Gateway Timeout";
case 505: return "HTTP Version Not Supported";
default: return "Unknown Error";
}
}
void
tr_http_escape( struct evbuffer * out,
const char * str, int len, tr_bool escape_slashes )
{
int i;
if( ( len < 0 ) && ( str != NULL ) )
len = strlen( str );
for( i = 0; i < len; i++ ) {
switch( str[i] ) {
case ',': case '-': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f': case 'g': case 'h': case 'i': case 'j':
case 'k': case 'l': case 'm': case 'n': case 'o':
case 'p': case 'q': case 'r': case 's': case 't':
case 'u': case 'v': case 'w': case 'x': case 'y': case 'z':
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F': case 'G': case 'H': case 'I': case 'J':
case 'K': case 'L': case 'M': case 'N': case 'O':
case 'P': case 'Q': case 'R': case 'S': case 'T':
case 'U': case 'V': case 'W': case 'X': case 'Y': case 'Z':
evbuffer_add( out, &str[i], 1 );
break;
case '/':
if(!escape_slashes) {
evbuffer_add( out, &str[i], 1 );
break;
}
/* Fall through. */
default:
evbuffer_add_printf( out, "%%%02X", (unsigned)(str[i]&0xFF) );
break;
}
}
}
char *
tr_http_unescape( const char * str, int len )
{
char * tmp = curl_unescape( str, len );
char * ret = tr_strdup( tmp );
curl_free( tmp );
return ret;
}
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