transmission/libtransmission/rpc-server.c

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/*
* This file Copyright (C) 2008 Charles Kerr <charles@rebelbase.com>
*
* 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.
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* This exemption does not extend to derived works not owned by
* the Transmission project.
*
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* $Id$
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*/
#include <assert.h>
#include <errno.h>
#include <string.h> /* memcpy */
#include <limits.h> /* INT_MAX */
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#include <sys/types.h> /* open */
#include <sys/stat.h> /* open */
#include <fcntl.h> /* open */
#include <unistd.h> /* close */
#ifdef HAVE_ZLIB
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#include <zlib.h>
#endif
#include <libevent/event.h>
#include <libevent/evhttp.h>
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#include "transmission.h"
#include "bencode.h"
#include "list.h"
#include "platform.h"
#include "rpcimpl.h"
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#include "rpc-server.h"
#include "trevent.h"
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#include "utils.h"
#include "web.h"
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#define MY_NAME "RPC Server"
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#define MY_REALM "Transmission"
#define TR_N_ELEMENTS( ary ) ( sizeof( ary ) / sizeof( *ary ) )
#ifdef WIN32
#define strncasecmp _strnicmp
#endif
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struct tr_rpc_server
{
unsigned int isEnabled : 1;
unsigned int isPasswordEnabled : 1;
unsigned int isWhitelistEnabled : 1;
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uint16_t port;
struct evhttp * httpd;
tr_handle * session;
char * username;
char * password;
char * whitelist;
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};
#define dbgmsg( ... ) \
do { \
if( tr_deepLoggingIsActive( ) ) \
tr_deepLog( __FILE__, __LINE__, MY_NAME, __VA_ARGS__ ); \
} while( 0 )
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/**
***
**/
static void
send_simple_response( struct evhttp_request * req,
int code,
const char * text )
{
const char * code_text = tr_webGetResponseStr( code );
struct evbuffer * body = evbuffer_new( );
evbuffer_add_printf( body, "<h1>%d: %s</h1>", code, code_text );
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if( text )
evbuffer_add_printf( body, "%s", text );
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evhttp_send_reply( req, code, code_text, body );
evbuffer_free( body );
}
static const char*
tr_memmem( const char * s1,
size_t l1,
const char * s2,
size_t l2 )
{
if( !l2 ) return s1;
while( l1 >= l2 )
{
l1--;
if( !memcmp( s1, s2, l2 ) )
return s1;
s1++;
}
return NULL;
}
static void
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handle_upload( struct evhttp_request * req,
struct tr_rpc_server * server )
{
if( req->type != EVHTTP_REQ_POST )
{
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send_simple_response( req, 405, NULL );
}
else
{
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const char * content_type = evhttp_find_header( req->input_headers,
"Content-Type" );
const char * query = strchr( req->uri, '?' );
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const int paused = query && strstr( query + 1, "paused=true" );
const char * in = (const char *) EVBUFFER_DATA( req->input_buffer );
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size_t inlen = EVBUFFER_LENGTH( req->input_buffer );
const char * boundary_key = "boundary=";
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const char * boundary_key_begin = strstr( content_type,
boundary_key );
const char * boundary_val =
boundary_key_begin ? boundary_key_begin +
strlen( boundary_key ) : "arglebargle";
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char * boundary = tr_strdup_printf( "--%s", boundary_val );
const size_t boundary_len = strlen( boundary );
const char * delim = tr_memmem( in, inlen, boundary, boundary_len );
while( delim )
{
size_t part_len;
const char * part = delim + boundary_len;
inlen -= ( part - in );
in = part;
delim = tr_memmem( in, inlen, boundary, boundary_len );
part_len = delim ? (size_t)( delim - part ) : inlen;
if( part_len )
{
char * text = tr_strndup( part, part_len );
if( strstr( text, "filename=\"" ) )
{
const char * body = strstr( text, "\r\n\r\n" );
if( body )
{
char * b64, *json, *freeme;
int json_len;
size_t body_len;
tr_benc top, *args;
body += 4; /* walk past the \r\n\r\n */
body_len = part_len - ( body - text );
if( body_len >= 2
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&& !memcmp( &body[body_len - 2], "\r\n", 2 ) )
body_len -= 2;
tr_bencInitDict( &top, 2 );
args = tr_bencDictAddDict( &top, "arguments", 2 );
tr_bencDictAddStr( &top, "method", "torrent-add" );
b64 = tr_base64_encode( body, body_len, NULL );
tr_bencDictAddStr( args, "metainfo", b64 );
tr_bencDictAddInt( args, "paused", paused );
json = tr_bencSaveAsJSON( &top, &json_len );
freeme = tr_rpc_request_exec_json( server->session,
json, json_len,
NULL );
tr_free( freeme );
tr_free( json );
tr_free( b64 );
tr_bencFree( &top );
}
}
tr_free( text );
}
}
tr_free( boundary );
/* 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 */
evhttp_add_header( req->output_headers, "Content-Type",
"text/xml; charset=UTF-8" );
send_simple_response( req, HTTP_OK, NULL );
}
}
static const char*
mimetype_guess( const char * path )
{
unsigned int i;
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const struct
{
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const char * suffix;
const char * mime_type;
} types[] = {
/* these are just the ones we need for serving clutch... */
{ "css", "text/css" },
{ "gif", "image/gif" },
{ "html", "text/html" },
{ "ico", "image/vnd.microsoft.icon" },
{ "js", "application/javascript" },
{ "png", "image/png" }
};
const char * dot = strrchr( path, '.' );
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for( i = 0; dot && i < TR_N_ELEMENTS( types ); ++i )
if( !strcmp( dot + 1, types[i].suffix ) )
return types[i].mime_type;
return "application/octet-stream";
}
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static void
add_response( struct evhttp_request * req,
struct evbuffer * out,
const void * content,
size_t content_len )
{
#ifndef HAVE_ZLIB
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evbuffer_add( out, content, content_len );
#else
const char * key = "Accept-Encoding";
const char * encoding = evhttp_find_header( req->input_headers, key );
const int do_deflate = encoding && strstr( encoding, "deflate" );
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if( !do_deflate )
{
evbuffer_add( out, content, content_len );
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}
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else
{
int state;
z_stream stream;
stream.zalloc = (alloc_func) Z_NULL;
stream.zfree = (free_func) Z_NULL;
stream.opaque = (voidpf) Z_NULL;
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deflateInit( &stream, Z_BEST_COMPRESSION );
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stream.next_in = (Bytef*) content;
stream.avail_in = content_len;
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/* allocate space for the raw data and call deflate() just once --
* we won't use the deflated data if it's longer than the raw data,
* so it's okay to let deflate() run out of output buffer space */
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evbuffer_expand( out, content_len );
stream.next_out = EVBUFFER_DATA( out );
stream.avail_out = content_len;
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state = deflate( &stream, Z_FINISH );
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if( state == Z_STREAM_END )
{
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EVBUFFER_LENGTH( out ) = content_len - stream.avail_out;
/* http://carsten.codimi.de/gzip.yaws/
It turns out that some browsers expect deflated data without
the first two bytes (a kind of header) and and the last four
bytes (an ADLER32 checksum). This format can of course
be produced by simply stripping these off. */
if( EVBUFFER_LENGTH( out ) >= 6 ) {
EVBUFFER_LENGTH( out ) -= 4;
evbuffer_drain( out, 2 );
}
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tr_ninf( MY_NAME, _( "Deflated response from %zu bytes to %zu" ),
content_len,
EVBUFFER_LENGTH( out ) );
evhttp_add_header( req->output_headers,
"Content-Encoding", "deflate" );
}
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else
{
evbuffer_drain( out, EVBUFFER_LENGTH( out ) );
evbuffer_add( out, content, content_len );
}
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deflateEnd( &stream );
}
#endif
}
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static void
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serve_file( struct evhttp_request * req,
const char * filename )
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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" );
send_simple_response( req, 405, NULL );
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}
else
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{
size_t content_len;
uint8_t * content;
const int error = errno;
errno = 0;
content_len = 0;
content = tr_loadFile( filename, &content_len );
if( errno )
{
send_simple_response( req, HTTP_NOTFOUND, NULL );
}
else
{
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struct evbuffer * out;
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errno = error;
out = evbuffer_new( );
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evhttp_add_header( req->output_headers, "Content-Type",
mimetype_guess( filename ) );
add_response( req, out, content, content_len );
evhttp_send_reply( req, HTTP_OK, "OK", out );
evbuffer_free( out );
tr_free( content );
}
}
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}
static void
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handle_clutch( struct evhttp_request * req,
struct tr_rpc_server * server )
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{
const char * clutchDir = tr_getClutchDir( server->session );
assert( !strncmp( req->uri, "/transmission/web/", 18 ) );
if( !clutchDir || !*clutchDir )
{
send_simple_response( req, HTTP_NOTFOUND,
"<p>Couldn't find Transmission's web interface files!</p>"
"<p>Users: to tell Transmission where to look, "
"set the TRANSMISSION_WEB_HOME environmental "
"variable to the folder where the web interface's "
"index.html is located.</p>"
"<p>Package Builders: to set a custom default at compile time, "
"#define PACKAGE_DATA_DIR in libtransmission/platform.c "
"or tweak tr_getClutchDir() by hand.</p>" );
}
else
{
char * pch;
char * subpath;
char * filename;
subpath = tr_strdup( req->uri + 18 );
if(( pch = strchr( subpath, '?' )))
*pch = '\0';
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filename = tr_strdup_printf( "%s%s%s",
clutchDir,
TR_PATH_DELIMITER_STR,
subpath && *subpath ? subpath : "index.html" );
serve_file( req, filename );
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tr_free( filename );
tr_free( subpath );
}
}
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static void
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handle_rpc( struct evhttp_request * req,
struct tr_rpc_server * server )
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{
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int len = 0;
char * out = NULL;
struct evbuffer * buf;
if( req->type == EVHTTP_REQ_GET )
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{
const char * q;
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if( ( q = strchr( req->uri, '?' ) ) )
out = tr_rpc_request_exec_uri( server->session,
q + 1,
strlen( q + 1 ),
&len );
}
else if( req->type == EVHTTP_REQ_POST )
{
out = tr_rpc_request_exec_json( server->session,
EVBUFFER_DATA( req->input_buffer ),
EVBUFFER_LENGTH( req->input_buffer ),
&len );
}
buf = evbuffer_new( );
add_response( req, buf, out, len );
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evhttp_add_header( req->output_headers, "Content-Type",
"application/json; charset=UTF-8" );
evhttp_send_reply( req, HTTP_OK, "OK", buf );
/* cleanup */
evbuffer_free( buf );
tr_free( out );
}
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static int
isAddressAllowed( const tr_rpc_server * server,
const char * address )
{
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const char * str;
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if( !server->isWhitelistEnabled )
return 1;
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for( str = server->whitelist; str && *str; )
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{
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const char * delimiter = strchr( str, ',' );
const int len = delimiter ? delimiter - str : (int)strlen( str );
char * token = tr_strndup( str, len );
const int match = tr_wildmat( address, token );
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tr_free( token );
if( match )
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return 1;
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if( !delimiter )
break;
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str = delimiter + 1;
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}
return 0;
}
static void
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handle_request( struct evhttp_request * req,
void * arg )
{
struct tr_rpc_server * server = arg;
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if( req && req->evcon )
{
const char * auth;
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char * user = NULL;
char * pass = NULL;
evhttp_add_header( req->output_headers, "Server", MY_REALM );
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auth = evhttp_find_header( req->input_headers, "Authorization" );
if( auth && !strncasecmp( auth, "basic ", 6 ) )
{
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int plen;
char * p = tr_base64_decode( auth + 6, 0, &plen );
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if( p && plen && ( ( pass = strchr( p, ':' ) ) ) )
{
user = p;
*pass++ = '\0';
}
}
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if( !isAddressAllowed( server, req->remote_host ) )
{
send_simple_response( req, 401, "Unauthorized IP Address" );
}
else if( server->isPasswordEnabled
&& ( !pass || !user || strcmp( server->username, user )
|| strcmp( server->password, pass ) ) )
{
evhttp_add_header( req->output_headers,
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"WWW-Authenticate",
"Basic realm=\"" MY_REALM "\"" );
send_simple_response( req, 401, "Unauthorized User" );
}
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else if( !strcmp( req->uri, "/transmission/web" )
|| !strcmp( req->uri, "/transmission/clutch" )
|| !strcmp( req->uri, "/" ) )
{
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evhttp_add_header( req->output_headers, "Location",
"/transmission/web/" );
send_simple_response( req, HTTP_MOVEPERM, NULL );
}
else if( !strncmp( req->uri, "/transmission/web/", 18 ) )
{
handle_clutch( req, server );
}
else if( !strncmp( req->uri, "/transmission/rpc", 17 ) )
{
handle_rpc( req, server );
}
else if( !strncmp( req->uri, "/transmission/upload", 20 ) )
{
handle_upload( req, server );
}
else
{
send_simple_response( req, HTTP_NOTFOUND, NULL );
}
tr_free( user );
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}
}
static void
startServer( void * vserver )
{
tr_rpc_server * server = vserver;
if( !server->httpd )
{
server->httpd = evhttp_new( tr_eventGetBase( server->session ) );
evhttp_bind_socket( server->httpd, "0.0.0.0", server->port );
evhttp_set_gencb( server->httpd, handle_request, server );
}
}
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static void
stopServer( tr_rpc_server * server )
{
if( server->httpd )
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{
evhttp_free( server->httpd );
server->httpd = NULL;
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}
}
static void
onEnabledChanged( void * vserver )
{
tr_rpc_server * server = vserver;
if( !server->isEnabled )
stopServer( server );
else
startServer( server );
}
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void
tr_rpcSetEnabled( tr_rpc_server * server,
int isEnabled )
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{
server->isEnabled = isEnabled != 0;
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tr_runInEventThread( server->session, onEnabledChanged, server );
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}
int
tr_rpcIsEnabled( const tr_rpc_server * server )
{
return server->isEnabled;
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}
static void
restartServer( void * vserver )
{
tr_rpc_server * server = vserver;
if( server->isEnabled )
{
stopServer( server );
startServer( server );
}
}
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void
tr_rpcSetPort( tr_rpc_server * server,
uint16_t port )
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{
if( server->port != port )
{
server->port = port;
if( server->isEnabled )
tr_runInEventThread( server->session, restartServer, server );
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}
}
uint16_t
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tr_rpcGetPort( const tr_rpc_server * server )
{
return server->port;
}
void
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tr_rpcSetWhitelist( tr_rpc_server * server,
const char * whitelist )
{
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tr_free( server->whitelist );
server->whitelist = tr_strdup( whitelist );
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}
char*
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tr_rpcGetWhitelist( const tr_rpc_server * server )
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{
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return tr_strdup( server->whitelist ? server->whitelist : "" );
}
void
tr_rpcSetWhitelistEnabled( tr_rpc_server * server,
int isEnabled )
{
server->isWhitelistEnabled = isEnabled != 0;
}
int
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,
int isEnabled )
{
server->isPasswordEnabled = isEnabled != 0;
dbgmsg( "setting 'password enabled' to %d", isEnabled );
}
int
tr_rpcIsPasswordEnabled( const tr_rpc_server * server )
{
return server->isPasswordEnabled;
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}
/****
***** LIFE CYCLE
****/
static void
closeServer( void * vserver )
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{
tr_rpc_server * s = vserver;
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stopServer( s );
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tr_free( s->whitelist );
tr_free( s->username );
tr_free( s->password );
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tr_free( s );
}
void
tr_rpcClose( tr_rpc_server ** ps )
{
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tr_runInEventThread( ( *ps )->session, closeServer, *ps );
*ps = NULL;
}
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tr_rpc_server *
tr_rpcInit( tr_handle * session,
int isEnabled,
uint16_t port,
int isWhitelistEnabled,
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const char * whitelist,
int isPasswordEnabled,
const char * username,
const char * password )
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{
tr_rpc_server * s;
s = tr_new0( tr_rpc_server, 1 );
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s->session = session;
s->port = port;
s->whitelist = tr_strdup( whitelist && *whitelist
? whitelist
: TR_DEFAULT_RPC_WHITELIST );
s->username = tr_strdup( username );
s->password = tr_strdup( password );
s->isWhitelistEnabled = isWhitelistEnabled != 0;
s->isPasswordEnabled = isPasswordEnabled != 0;
s->isEnabled = isEnabled != 0;
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if( isEnabled )
tr_runInEventThread( session, startServer, s );
return s;
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}