754 lines
21 KiB
C
754 lines
21 KiB
C
/*
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* This file Copyright (C) 2008 Charles Kerr <charles@transmissionbt.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 <errno.h>
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#include <string.h> /* memcpy */
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#include <limits.h> /* INT_MAX */
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#include <sys/types.h> /* open */
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#include <sys/stat.h> /* open */
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#include <fcntl.h> /* open */
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#include <unistd.h> /* close */
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#ifdef HAVE_ZLIB
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#include <zlib.h>
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#endif
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#include <libevent/event.h>
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#include <libevent/evhttp.h>
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#include "transmission.h"
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#include "bencode.h"
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#include "list.h"
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#include "platform.h"
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#include "rpcimpl.h"
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#include "rpc-server.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 MY_NAME "RPC Server"
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#define MY_REALM "Transmission"
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#define TR_N_ELEMENTS( ary ) ( sizeof( ary ) / sizeof( *ary ) )
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#ifdef WIN32
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#define strncasecmp _strnicmp
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#endif
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struct tr_rpc_server
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{
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tr_bool isEnabled;
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tr_bool isPasswordEnabled;
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tr_bool isWhitelistEnabled;
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tr_port port;
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struct evhttp * httpd;
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tr_session * session;
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char * username;
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char * password;
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char * whitelistStr;
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tr_list * whitelist;
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#ifdef HAVE_ZLIB
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z_stream stream;
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#endif
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};
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#define dbgmsg( ... ) \
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do { \
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if( tr_deepLoggingIsActive( ) ) \
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tr_deepLog( __FILE__, __LINE__, MY_NAME, __VA_ARGS__ ); \
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} while( 0 )
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/**
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***
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**/
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static void
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send_simple_response( struct evhttp_request * req,
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int code,
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const char * text )
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{
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const char * code_text = tr_webGetResponseStr( code );
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struct evbuffer * body = tr_getBuffer( );
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evbuffer_add_printf( body, "<h1>%d: %s</h1>", code, code_text );
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if( text )
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evbuffer_add_printf( body, "%s", text );
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evhttp_send_reply( req, code, code_text, body );
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tr_releaseBuffer( body );
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}
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static const char*
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tr_memmem( const char * s1,
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size_t l1,
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const char * s2,
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size_t l2 )
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{
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if( !l2 ) return s1;
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while( l1 >= l2 )
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{
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l1--;
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if( !memcmp( s1, s2, l2 ) )
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return s1;
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s1++;
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}
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return NULL;
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}
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static void
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handle_upload( struct evhttp_request * req,
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struct tr_rpc_server * server )
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{
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if( req->type != EVHTTP_REQ_POST )
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{
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send_simple_response( req, 405, NULL );
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}
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else
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{
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const char * content_type = evhttp_find_header( req->input_headers,
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"Content-Type" );
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const char * query = strchr( req->uri, '?' );
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const int paused = query && strstr( query + 1, "paused=true" );
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const char * in = (const char *) EVBUFFER_DATA( req->input_buffer );
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size_t inlen = EVBUFFER_LENGTH( req->input_buffer );
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const char * boundary_key = "boundary=";
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const char * boundary_key_begin = strstr( content_type,
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boundary_key );
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const char * boundary_val =
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boundary_key_begin ? boundary_key_begin +
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strlen( boundary_key ) : "arglebargle";
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char * boundary = tr_strdup_printf( "--%s", boundary_val );
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const size_t boundary_len = strlen( boundary );
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const char * delim = tr_memmem( in, inlen, boundary, boundary_len );
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while( delim )
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{
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size_t part_len;
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const char * part = delim + boundary_len;
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inlen -= ( part - in );
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in = part;
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delim = tr_memmem( in, inlen, boundary, boundary_len );
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part_len = delim ? (size_t)( delim - part ) : inlen;
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if( part_len )
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{
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char * text = tr_strndup( part, part_len );
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if( strstr( text, "filename=\"" ) )
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{
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const char * body = strstr( text, "\r\n\r\n" );
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if( body )
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{
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char * b64;
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size_t body_len;
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tr_benc top, *args;
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struct evbuffer * json = tr_getBuffer( );
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body += 4; /* walk past the \r\n\r\n */
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body_len = part_len - ( body - text );
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if( body_len >= 2
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&& !memcmp( &body[body_len - 2], "\r\n", 2 ) )
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body_len -= 2;
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tr_bencInitDict( &top, 2 );
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args = tr_bencDictAddDict( &top, "arguments", 2 );
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tr_bencDictAddStr( &top, "method", "torrent-add" );
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b64 = tr_base64_encode( body, body_len, NULL );
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tr_bencDictAddStr( args, "metainfo", b64 );
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tr_bencDictAddInt( args, "paused", paused );
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tr_bencSaveAsJSON( &top, json );
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tr_rpc_request_exec_json( server->session,
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EVBUFFER_DATA( json ),
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EVBUFFER_LENGTH( json ),
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NULL );
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tr_releaseBuffer( json );
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tr_free( b64 );
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tr_bencFree( &top );
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}
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}
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tr_free( text );
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}
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}
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tr_free( boundary );
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/* use xml here because json responses to file uploads is trouble.
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* see http://www.malsup.com/jquery/form/#sample7 for details */
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evhttp_add_header( req->output_headers, "Content-Type",
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"text/xml; charset=UTF-8" );
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send_simple_response( req, HTTP_OK, NULL );
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}
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}
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static const char*
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mimetype_guess( const char * path )
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{
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unsigned int i;
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const struct
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{
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const char * suffix;
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const char * mime_type;
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} types[] = {
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/* these are just the ones we need for serving clutch... */
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{ "css", "text/css" },
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{ "gif", "image/gif" },
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{ "html", "text/html" },
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{ "ico", "image/vnd.microsoft.icon" },
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{ "js", "application/javascript" },
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{ "png", "image/png" }
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};
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const char * dot = strrchr( path, '.' );
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for( i = 0; dot && i < TR_N_ELEMENTS( types ); ++i )
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if( !strcmp( dot + 1, types[i].suffix ) )
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return types[i].mime_type;
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return "application/octet-stream";
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}
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static void
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add_response( struct evhttp_request * req,
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struct tr_rpc_server * server,
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struct evbuffer * out,
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const void * content,
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size_t content_len )
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{
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#ifndef HAVE_ZLIB
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evbuffer_add( out, content, content_len );
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#else
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const char * key = "Accept-Encoding";
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const char * encoding = evhttp_find_header( req->input_headers, key );
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const int do_deflate = encoding && strstr( encoding, "deflate" );
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if( !do_deflate )
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{
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evbuffer_add( out, content, content_len );
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}
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else
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{
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int state;
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server->stream.next_in = (Bytef*) content;
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server->stream.avail_in = content_len;
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/* allocate space for the raw data and call deflate() just once --
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* we won't use the deflated data if it's longer than the raw data,
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* so it's okay to let deflate() run out of output buffer space */
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evbuffer_expand( out, content_len );
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server->stream.next_out = EVBUFFER_DATA( out );
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server->stream.avail_out = content_len;
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state = deflate( &server->stream, Z_FINISH );
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if( state == Z_STREAM_END )
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{
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EVBUFFER_LENGTH( out ) = content_len - server->stream.avail_out;
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/* http://carsten.codimi.de/gzip.yaws/
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It turns out that some browsers expect deflated data without
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the first two bytes (a kind of header) and and the last four
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bytes (an ADLER32 checksum). This format can of course
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be produced by simply stripping these off. */
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if( EVBUFFER_LENGTH( out ) >= 6 ) {
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EVBUFFER_LENGTH( out ) -= 4;
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evbuffer_drain( out, 2 );
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}
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#if 0
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tr_ninf( MY_NAME, _( "Deflated response from %zu bytes to %zu" ),
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content_len,
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EVBUFFER_LENGTH( out ) );
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#endif
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evhttp_add_header( req->output_headers,
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"Content-Encoding", "deflate" );
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}
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else
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{
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evbuffer_drain( out, EVBUFFER_LENGTH( out ) );
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evbuffer_add( out, content, content_len );
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}
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deflateReset( &server->stream );
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}
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#endif
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}
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static void
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serve_file( struct evhttp_request * req,
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struct tr_rpc_server * server,
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const char * filename )
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{
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if( req->type != EVHTTP_REQ_GET )
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{
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evhttp_add_header( req->output_headers, "Allow", "GET" );
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send_simple_response( req, 405, NULL );
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}
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else
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{
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size_t content_len;
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uint8_t * content;
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const int error = errno;
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errno = 0;
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content_len = 0;
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content = tr_loadFile( filename, &content_len );
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if( errno )
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{
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send_simple_response( req, HTTP_NOTFOUND, NULL );
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}
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else
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{
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struct evbuffer * out;
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errno = error;
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out = tr_getBuffer( );
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evhttp_add_header( req->output_headers, "Content-Type",
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mimetype_guess( filename ) );
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add_response( req, server, out, content, content_len );
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evhttp_send_reply( req, HTTP_OK, "OK", out );
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tr_releaseBuffer( out );
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tr_free( content );
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}
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}
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}
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static void
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handle_clutch( struct evhttp_request * req,
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struct tr_rpc_server * server )
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{
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const char * clutchDir = tr_getClutchDir( server->session );
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assert( !strncmp( req->uri, "/transmission/web/", 18 ) );
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if( !clutchDir || !*clutchDir )
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{
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send_simple_response( req, HTTP_NOTFOUND,
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"<p>Couldn't find Transmission's web interface files!</p>"
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"<p>Users: to tell Transmission where to look, "
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"set the TRANSMISSION_WEB_HOME environmental "
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"variable to the folder where the web interface's "
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"index.html is located.</p>"
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"<p>Package Builders: to set a custom default at compile time, "
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"#define PACKAGE_DATA_DIR in libtransmission/platform.c "
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"or tweak tr_getClutchDir() by hand.</p>" );
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}
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else
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{
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char * pch;
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char * subpath;
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char * filename;
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subpath = tr_strdup( req->uri + 18 );
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if(( pch = strchr( subpath, '?' )))
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*pch = '\0';
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filename = tr_strdup_printf( "%s%s%s",
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clutchDir,
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TR_PATH_DELIMITER_STR,
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subpath && *subpath ? subpath : "index.html" );
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serve_file( req, server, filename );
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tr_free( filename );
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tr_free( subpath );
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}
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}
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static void
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handle_rpc( struct evhttp_request * req,
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struct tr_rpc_server * server )
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{
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struct evbuffer * response = tr_getBuffer( );
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if( req->type == EVHTTP_REQ_GET )
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{
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const char * q;
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if( ( q = strchr( req->uri, '?' ) ) )
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tr_rpc_request_exec_uri( server->session, q + 1, strlen( q + 1 ), response );
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}
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else if( req->type == EVHTTP_REQ_POST )
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{
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tr_rpc_request_exec_json( server->session,
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EVBUFFER_DATA( req->input_buffer ),
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EVBUFFER_LENGTH( req->input_buffer ),
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response );
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}
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{
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struct evbuffer * buf = tr_getBuffer( );
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add_response( req, server, buf,
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EVBUFFER_DATA( response ),
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EVBUFFER_LENGTH( response ) );
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evhttp_add_header( req->output_headers, "Content-Type",
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"application/json; charset=UTF-8" );
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evhttp_send_reply( req, HTTP_OK, "OK", buf );
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tr_releaseBuffer( buf );
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}
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/* cleanup */
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tr_releaseBuffer( response );
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}
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static tr_bool
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isAddressAllowed( const tr_rpc_server * server,
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const char * address )
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{
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tr_list * l;
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if( !server->isWhitelistEnabled )
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return TRUE;
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for( l=server->whitelist; l!=NULL; l=l->next )
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if( tr_wildmat( address, l->data ) )
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return TRUE;
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return FALSE;
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}
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static void
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handle_request( struct evhttp_request * req,
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void * arg )
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{
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struct tr_rpc_server * server = arg;
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if( req && req->evcon )
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{
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const char * auth;
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char * user = NULL;
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char * pass = NULL;
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evhttp_add_header( req->output_headers, "Server", MY_REALM );
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auth = evhttp_find_header( req->input_headers, "Authorization" );
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if( auth && !strncasecmp( auth, "basic ", 6 ) )
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{
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int plen;
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char * p = tr_base64_decode( auth + 6, 0, &plen );
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if( p && plen && ( ( pass = strchr( p, ':' ) ) ) )
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{
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user = p;
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*pass++ = '\0';
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}
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}
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if( !isAddressAllowed( server, req->remote_host ) )
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{
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send_simple_response( req, 401,
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"<p>Unauthorized IP Address.</p>"
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"<p>Either disable the IP address whitelist or add your address to it.</p>"
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"<p>If you're editing settings.json, see the 'rpc-whitelist' and 'rpc-whitelist-enabled' entries.</p>"
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"<p>If you're still using ACLs, use a whitelist instead. See the transmission-daemon manpage for details.</p>" );
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}
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else if( server->isPasswordEnabled
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&& ( !pass || !user || strcmp( server->username, user )
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|| strcmp( server->password, pass ) ) )
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{
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evhttp_add_header( req->output_headers,
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"WWW-Authenticate",
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"Basic realm=\"" MY_REALM "\"" );
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send_simple_response( req, 401, "Unauthorized User" );
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}
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else if( !strcmp( req->uri, "/transmission/web" )
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|| !strcmp( req->uri, "/transmission/clutch" )
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|| !strcmp( req->uri, "/" ) )
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{
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evhttp_add_header( req->output_headers, "Location",
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"/transmission/web/" );
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send_simple_response( req, HTTP_MOVEPERM, NULL );
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}
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else if( !strncmp( req->uri, "/transmission/web/", 18 ) )
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{
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handle_clutch( req, server );
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}
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else if( !strncmp( req->uri, "/transmission/rpc", 17 ) )
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{
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handle_rpc( req, server );
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}
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else if( !strncmp( req->uri, "/transmission/upload", 20 ) )
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{
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handle_upload( req, server );
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}
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else
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{
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send_simple_response( req, HTTP_NOTFOUND, NULL );
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}
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tr_free( user );
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}
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}
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static void
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startServer( void * vserver )
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{
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tr_rpc_server * server = vserver;
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if( !server->httpd )
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{
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server->httpd = evhttp_new( tr_eventGetBase( server->session ) );
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evhttp_bind_socket( server->httpd, "0.0.0.0", server->port );
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evhttp_set_gencb( server->httpd, handle_request, server );
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}
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}
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static void
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stopServer( tr_rpc_server * server )
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{
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if( server->httpd )
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{
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evhttp_free( server->httpd );
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server->httpd = NULL;
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}
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}
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static void
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onEnabledChanged( void * vserver )
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{
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tr_rpc_server * server = vserver;
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if( !server->isEnabled )
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stopServer( server );
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else
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startServer( server );
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}
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void
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tr_rpcSetEnabled( tr_rpc_server * server,
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tr_bool isEnabled )
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{
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server->isEnabled = isEnabled;
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tr_runInEventThread( server->session, onEnabledChanged, server );
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}
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tr_bool
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tr_rpcIsEnabled( const tr_rpc_server * server )
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{
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return server->isEnabled;
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}
|
|
|
|
static void
|
|
restartServer( void * vserver )
|
|
{
|
|
tr_rpc_server * server = vserver;
|
|
|
|
if( server->isEnabled )
|
|
{
|
|
stopServer( server );
|
|
startServer( server );
|
|
}
|
|
}
|
|
|
|
void
|
|
tr_rpcSetPort( tr_rpc_server * server,
|
|
tr_port port )
|
|
{
|
|
if( server->port != port )
|
|
{
|
|
server->port = port;
|
|
|
|
if( server->isEnabled )
|
|
tr_runInEventThread( server->session, restartServer, server );
|
|
}
|
|
}
|
|
|
|
tr_port
|
|
tr_rpcGetPort( const tr_rpc_server * server )
|
|
{
|
|
return server->port;
|
|
}
|
|
|
|
void
|
|
tr_rpcSetWhitelist( tr_rpc_server * server,
|
|
const char * whitelistStr )
|
|
{
|
|
void * tmp;
|
|
const char * walk;
|
|
|
|
/* keep the string */
|
|
tr_free( server->whitelistStr );
|
|
server->whitelistStr = tr_strdup( whitelistStr );
|
|
|
|
/* clear out the old whitelist entries */
|
|
while(( tmp = tr_list_pop_front( &server->whitelist )))
|
|
tr_free( tmp );
|
|
|
|
/* build the new whitelist entries */
|
|
for( walk=whitelistStr; walk && *walk; ) {
|
|
const char * delimiters = " ,;";
|
|
const size_t len = strcspn( walk, delimiters );
|
|
char * token = tr_strndup( walk, len );
|
|
tr_list_append( &server->whitelist, token );
|
|
if( strcspn( token, "+-" ) < len )
|
|
tr_ninf( MY_NAME, "Adding address to whitelist: %s (And it has a '+' or '-'! Are you using an old ACL by mistake?)", token );
|
|
else
|
|
tr_ninf( MY_NAME, "Adding address to whitelist: %s", token );
|
|
|
|
if( walk[len]=='\0' )
|
|
break;
|
|
walk += len + 1;
|
|
}
|
|
}
|
|
|
|
char*
|
|
tr_rpcGetWhitelist( const tr_rpc_server * server )
|
|
{
|
|
return tr_strdup( server->whitelistStr ? server->whitelistStr : "" );
|
|
}
|
|
|
|
void
|
|
tr_rpcSetWhitelistEnabled( tr_rpc_server * server,
|
|
tr_bool isEnabled )
|
|
{
|
|
server->isWhitelistEnabled = isEnabled != 0;
|
|
}
|
|
|
|
tr_bool
|
|
tr_rpcGetWhitelistEnabled( const tr_rpc_server * server )
|
|
{
|
|
return server->isWhitelistEnabled;
|
|
}
|
|
|
|
/****
|
|
***** PASSWORD
|
|
****/
|
|
|
|
void
|
|
tr_rpcSetUsername( tr_rpc_server * server,
|
|
const char * username )
|
|
{
|
|
tr_free( server->username );
|
|
server->username = tr_strdup( username );
|
|
dbgmsg( "setting our Username to [%s]", server->username );
|
|
}
|
|
|
|
char*
|
|
tr_rpcGetUsername( const tr_rpc_server * server )
|
|
{
|
|
return tr_strdup( server->username ? server->username : "" );
|
|
}
|
|
|
|
void
|
|
tr_rpcSetPassword( tr_rpc_server * server,
|
|
const char * password )
|
|
{
|
|
tr_free( server->password );
|
|
server->password = tr_strdup( password );
|
|
dbgmsg( "setting our Password to [%s]", server->password );
|
|
}
|
|
|
|
char*
|
|
tr_rpcGetPassword( const tr_rpc_server * server )
|
|
{
|
|
return tr_strdup( server->password ? server->password : "" );
|
|
}
|
|
|
|
void
|
|
tr_rpcSetPasswordEnabled( tr_rpc_server * server,
|
|
tr_bool isEnabled )
|
|
{
|
|
server->isPasswordEnabled = isEnabled;
|
|
dbgmsg( "setting 'password enabled' to %d", (int)isEnabled );
|
|
}
|
|
|
|
tr_bool
|
|
tr_rpcIsPasswordEnabled( const tr_rpc_server * server )
|
|
{
|
|
return server->isPasswordEnabled;
|
|
}
|
|
|
|
/****
|
|
***** LIFE CYCLE
|
|
****/
|
|
|
|
static void
|
|
closeServer( void * vserver )
|
|
{
|
|
void * tmp;
|
|
tr_rpc_server * s = vserver;
|
|
|
|
stopServer( s );
|
|
while(( tmp = tr_list_pop_front( &s->whitelist )))
|
|
tr_free( tmp );
|
|
#ifdef HAVE_ZLIB
|
|
deflateEnd( &s->stream );
|
|
#endif
|
|
tr_free( s->whitelistStr );
|
|
tr_free( s->username );
|
|
tr_free( s->password );
|
|
tr_free( s );
|
|
}
|
|
|
|
void
|
|
tr_rpcClose( tr_rpc_server ** ps )
|
|
{
|
|
tr_runInEventThread( ( *ps )->session, closeServer, *ps );
|
|
*ps = NULL;
|
|
}
|
|
|
|
tr_rpc_server *
|
|
tr_rpcInit( tr_session * session,
|
|
tr_bool isEnabled,
|
|
tr_port port,
|
|
tr_bool isWhitelistEnabled,
|
|
const char * whitelist,
|
|
tr_bool isPasswordEnabled,
|
|
const char * username,
|
|
const char * password )
|
|
{
|
|
tr_rpc_server * s;
|
|
|
|
s = tr_new0( tr_rpc_server, 1 );
|
|
s->session = session;
|
|
s->port = port;
|
|
s->username = tr_strdup( username );
|
|
s->password = tr_strdup( password );
|
|
s->isWhitelistEnabled = isWhitelistEnabled;
|
|
s->isPasswordEnabled = isPasswordEnabled;
|
|
s->isEnabled = isEnabled != 0;
|
|
tr_rpcSetWhitelist( s, whitelist ? whitelist : "127.0.0.1" );
|
|
|
|
#ifdef HAVE_ZLIB
|
|
s->stream.zalloc = (alloc_func) Z_NULL;
|
|
s->stream.zfree = (free_func) Z_NULL;
|
|
s->stream.opaque = (voidpf) Z_NULL;
|
|
deflateInit( &s->stream, Z_BEST_COMPRESSION );
|
|
#endif
|
|
|
|
if( isEnabled )
|
|
tr_runInEventThread( session, startServer, s );
|
|
|
|
if( isEnabled )
|
|
{
|
|
tr_ninf( MY_NAME, _( "Serving RPC and Web requests on port %d" ), (int)port );
|
|
|
|
if( isWhitelistEnabled )
|
|
tr_ninf( MY_NAME, _( "Whitelist enabled" ) );
|
|
|
|
if( isPasswordEnabled )
|
|
tr_ninf( MY_NAME, _( "Password required" ) );
|
|
}
|
|
|
|
return s;
|
|
}
|