401 lines
11 KiB
C
401 lines
11 KiB
C
/*
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* This file Copyright (C) 2008 Charles Kerr <charles@rebelbase.com>
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*
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* This file is licensed by the GPL version 2. Works owned by the
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* Transmission project are granted a special exemption to clause 2(b)
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* so that the bulk of its code can remain under the MIT license.
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* This exemption does not extend to derived works not owned by
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* the Transmission project.
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*
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* $Id$
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*/
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#include <assert.h>
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#include <stdlib.h> /* bsearch */
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#include <event.h>
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#include <curl/curl.h>
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#include "transmission.h"
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#include "trevent.h"
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#include "utils.h"
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#include "web.h"
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#define CURL_CHECK_VERSION( major, minor, micro ) \
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( LIBCURL_VERSION_MAJOR > ( major ) \
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|| ( LIBCURL_VERSION_MAJOR == ( major ) && LIBCURL_VERSION_MINOR >\
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( minor ) ) \
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|| ( LIBCURL_VERSION_MAJOR == ( major ) && LIBCURL_VERSION_MINOR ==\
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( minor ) \
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&& LIBCURL_VERSION_PATCH >= ( micro ) ) )
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#define PULSE_MSEC 100
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#define dbgmsg( fmt... ) tr_deepLog( __FILE__, __LINE__, "web", ## fmt )
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struct tr_web
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{
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unsigned int dying : 1;
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unsigned int running : 1;
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int remain;
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CURLM * cm;
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tr_session * session;
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struct event timer;
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};
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struct tr_web_task
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{
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unsigned long tag;
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struct evbuffer * response;
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char * url;
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char * range;
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tr_session * session;
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tr_web_done_func * done_func;
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void * done_func_user_data;
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};
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static void
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processCompletedTasks( tr_web * web )
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{
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CURL * easy;
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CURLMsg * msg;
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do
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{
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/* this convoluted loop is from the "hiperinfo.c" sample which
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* hints that removing an easy handle in curl_multi_info_read's
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* loop may be unsafe */
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int more;
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easy = NULL;
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while( ( msg = curl_multi_info_read( web->cm, &more ) ) )
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{
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if( msg->msg == CURLMSG_DONE )
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{
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easy = msg->easy_handle;
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break;
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}
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}
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if( easy )
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{
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struct tr_web_task * task;
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long response_code;
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curl_easy_getinfo( easy, CURLINFO_PRIVATE, (void*)&task );
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curl_easy_getinfo( easy, CURLINFO_RESPONSE_CODE, &response_code );
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--web->remain;
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dbgmsg( "task #%lu done (%d remain)", task->tag, web->remain );
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task->done_func( web->session,
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response_code,
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EVBUFFER_DATA( task->response ),
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EVBUFFER_LENGTH( task->response ),
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task->done_func_user_data );
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curl_multi_remove_handle( web->cm, easy );
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curl_easy_cleanup( easy );
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evbuffer_free( task->response );
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tr_free( task->range );
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tr_free( task->url );
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tr_free( task );
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}
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}
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while( easy );
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}
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static void
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pump( tr_web * web )
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{
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int unused;
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CURLMcode rc;
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do
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{
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rc = curl_multi_perform( web->cm, &unused );
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}
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while( rc == CURLM_CALL_MULTI_PERFORM );
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if( rc == CURLM_OK )
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processCompletedTasks( web );
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else
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tr_err( "%s", curl_multi_strerror( rc ) );
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}
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static size_t
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writeFunc( void * ptr,
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size_t size,
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size_t nmemb,
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void * task )
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{
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const size_t byteCount = size * nmemb;
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evbuffer_add( ( (struct tr_web_task*)task )->response, ptr, byteCount );
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return byteCount;
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}
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static void
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ensureTimerIsRunning( tr_web * web )
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{
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if( !web->running )
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{
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struct timeval tv = tr_timevalMsec( PULSE_MSEC );
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dbgmsg( "starting web timer" );
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web->running = 1;
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evtimer_add( &web->timer, &tv );
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}
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}
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static int
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getCurlProxyType( tr_proxy_type t )
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{
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switch( t )
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{
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case TR_PROXY_SOCKS4:
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return CURLPROXY_SOCKS4;
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case TR_PROXY_SOCKS5:
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return CURLPROXY_SOCKS5;
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default:
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return CURLPROXY_HTTP;
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}
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}
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static void
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addTask( void * vtask )
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{
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struct tr_web_task * task = vtask;
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const tr_handle * session = task->session;
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if( session && session->web )
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{
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struct tr_web * web = session->web;
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CURL * ch;
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ensureTimerIsRunning( web );
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++web->remain;
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dbgmsg( "adding task #%lu [%s] (%d remain)", task->tag, task->url,
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web->remain );
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ch = curl_easy_init( );
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if( !task->range && session->isProxyEnabled )
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{
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curl_easy_setopt( ch, CURLOPT_PROXY, session->proxy );
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curl_easy_setopt( ch, CURLOPT_PROXYPORT, session->proxyPort );
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curl_easy_setopt( ch, CURLOPT_PROXYTYPE,
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getCurlProxyType( session->proxyType ) );
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curl_easy_setopt( ch, CURLOPT_PROXYAUTH, CURLAUTH_ANY );
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}
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if( !task->range && session->isProxyAuthEnabled )
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{
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char * str = tr_strdup_printf( "%s:%s", session->proxyUsername,
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session->proxyPassword );
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curl_easy_setopt( ch, CURLOPT_PROXYUSERPWD, str );
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tr_free( str );
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}
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curl_easy_setopt( ch, CURLOPT_PRIVATE, task );
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curl_easy_setopt( ch, CURLOPT_URL, task->url );
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curl_easy_setopt( ch, CURLOPT_WRITEFUNCTION, writeFunc );
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curl_easy_setopt( ch, CURLOPT_WRITEDATA, task );
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curl_easy_setopt( ch, CURLOPT_USERAGENT,
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TR_NAME "/" LONG_VERSION_STRING );
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curl_easy_setopt( ch, CURLOPT_SSL_VERIFYHOST, 0 );
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curl_easy_setopt( ch, CURLOPT_SSL_VERIFYPEER, 0 );
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curl_easy_setopt( ch, CURLOPT_FORBID_REUSE, 1 );
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curl_easy_setopt( ch, CURLOPT_NOSIGNAL, 1 );
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curl_easy_setopt( ch, CURLOPT_FOLLOWLOCATION, 1 );
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curl_easy_setopt( ch, CURLOPT_MAXREDIRS, 5 );
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curl_easy_setopt( ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4 );
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curl_easy_setopt( ch, CURLOPT_VERBOSE, getenv(
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"TR_CURL_VERBOSE" ) != NULL );
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if( task->range )
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curl_easy_setopt( ch, CURLOPT_RANGE, task->range );
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else /* don't set encoding if range is sent; it messes up binary data */
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curl_easy_setopt( ch, CURLOPT_ENCODING, "" );
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curl_multi_add_handle( web->cm, ch );
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}
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}
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void
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tr_webRun( tr_session * session,
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const char * url,
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const char * range,
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tr_web_done_func * done_func,
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void * done_func_user_data )
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{
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if( session->web )
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{
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static unsigned long tag = 0;
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struct tr_web_task * task;
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task = tr_new0( struct tr_web_task, 1 );
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task->session = session;
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task->url = tr_strdup( url );
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task->range = tr_strdup( range );
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task->done_func = done_func;
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task->done_func_user_data = done_func_user_data;
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task->tag = ++tag;
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task->response = evbuffer_new( );
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tr_runInEventThread( session, addTask, task );
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}
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}
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static void
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webDestroy( tr_web * web )
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{
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dbgmsg( "deleting web timer" );
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assert( !web->running );
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evtimer_del( &web->timer );
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curl_multi_cleanup( web->cm );
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tr_free( web );
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}
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static void
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pulse( int socket UNUSED,
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short action UNUSED,
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void * vweb )
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{
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tr_web * web = vweb;
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assert( web->running );
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pump( web );
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evtimer_del( &web->timer );
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web->running = web->remain > 0;
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if( web->running )
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{
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struct timeval tv = tr_timevalMsec( PULSE_MSEC );
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evtimer_add( &web->timer, &tv );
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}
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else if( web->dying )
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{
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webDestroy( web );
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}
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else
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{
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dbgmsg( "stopping web timer" );
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}
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}
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tr_web*
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tr_webInit( tr_session * session )
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{
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static int curlInited = FALSE;
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tr_web * web;
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/* call curl_global_init if we haven't done it already.
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* try to enable ssl for https support; but if that fails,
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* try a plain vanilla init */
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if( curlInited == FALSE )
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{
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curlInited = TRUE;
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if( curl_global_init( CURL_GLOBAL_SSL ) )
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curl_global_init( 0 );
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}
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web = tr_new0( struct tr_web, 1 );
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web->cm = curl_multi_init( );
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web->session = session;
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evtimer_set( &web->timer, pulse, web );
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#if CURL_CHECK_VERSION( 7, 16, 3 )
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curl_multi_setopt( web->cm, CURLMOPT_MAXCONNECTS, 10 );
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#endif
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pump( web );
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return web;
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}
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void
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tr_webClose( tr_web ** web_in )
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{
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tr_web * web = *web_in;
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*web_in = NULL;
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if( !web->running )
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webDestroy( web );
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else
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web->dying = 1;
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}
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/***
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****
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***/
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static struct http_msg
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{
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long code;
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const char * text;
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} http_msg[] = {
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{ 101, "Switching Protocols" },
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{ 200, "OK" },
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{ 201, "Created" },
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{ 202, "Accepted" },
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{ 203, "Non-Authoritative Information" },
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{ 204, "No Content" },
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{ 205, "Reset Content" },
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{ 206, "Partial Content" },
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{ 300, "Multiple Choices" },
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{ 301, "Moved Permanently" },
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{ 302, "Found" },
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{ 303, "See Other" },
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{ 304, "Not Modified" },
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{ 305, "Use Proxy" },
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{ 306, "(Unused)" },
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{ 307, "Temporary Redirect" },
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{ 400, "Bad Request" },
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{ 401, "Unauthorized" },
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{ 402, "Payment Required" },
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{ 403, "Forbidden" },
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{ 404, "Not Found" },
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{ 405, "Method Not Allowed" },
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{ 406, "Not Acceptable" },
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{ 407, "Proxy Authentication Required" },
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{ 408, "Request Timeout" },
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{ 409, "Conflict" },
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{ 410, "Gone" },
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{ 411, "Length Required" },
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{ 412, "Precondition Failed" },
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{ 413, "Request Entity Too Large" },
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{ 414, "Request-URI Too Long" },
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{ 415, "Unsupported Media Type" },
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{ 416, "Requested Range Not Satisfiable" },
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{ 417, "Expectation Failed" },
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{ 500, "Internal Server Error" },
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{ 501, "Not Implemented" },
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{ 502, "Bad Gateway" },
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{ 503, "Service Unavailable" },
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{ 504, "Gateway Timeout" },
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{ 505, "HTTP Version Not Supported" },
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{ 0, NULL }
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};
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static int
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compareResponseCodes( const void * va,
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const void * vb )
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{
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const long a = *(const long*) va;
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const struct http_msg * b = vb;
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return a - b->code;
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}
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const char *
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tr_webGetResponseStr( long code )
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{
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struct http_msg * msg = bsearch( &code,
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http_msg,
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sizeof( http_msg ) /
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sizeof( http_msg[0] ),
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sizeof( http_msg[0] ),
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compareResponseCodes );
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return msg ? msg->text : "Unknown Error";
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}
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