2008-05-18 16:44:30 +00:00
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/*
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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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2008-05-28 17:17:12 +00:00
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* $Id$
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2008-05-18 16:44:30 +00:00
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*/
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#include <assert.h>
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2008-06-04 17:14:58 +00:00
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#include <ctype.h> /* isdigit */
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#include <errno.h>
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#include <stdlib.h> /* strtol */
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2008-05-18 16:44:30 +00:00
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#include <string.h>
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2008-06-05 16:23:03 +00:00
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#include <unistd.h> /* unlink */
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2008-05-19 00:22:04 +00:00
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#include <libevent/event.h>
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2008-06-05 16:23:03 +00:00
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#include <shttpd/defs.h> /* edit_passwords */
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2008-05-19 00:22:04 +00:00
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#include <shttpd/shttpd.h>
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2008-05-18 16:44:30 +00:00
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#include "transmission.h"
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#include "rpc.h"
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#include "rpc-server.h"
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#include "utils.h"
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2008-06-02 19:57:16 +00:00
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#define MY_NAME "RPC Server"
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2008-06-05 16:23:03 +00:00
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#define MY_REALM "Transmission RPC Server"
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2008-06-02 19:57:16 +00:00
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2008-05-18 16:44:30 +00:00
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#define BUSY_INTERVAL_MSEC 30
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2008-06-24 21:39:07 +00:00
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#define IDLE_INTERVAL_MSEC 66
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#define UNUSED_INTERVAL_MSEC 100
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2008-05-18 16:44:30 +00:00
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struct tr_rpc_server
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{
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int port;
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2008-06-05 02:07:17 +00:00
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time_t lastRequestTime;
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2008-05-18 16:44:30 +00:00
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struct shttpd_ctx * ctx;
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tr_handle * session;
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struct evbuffer * in;
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struct evbuffer * out;
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struct event timer;
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2008-06-05 16:23:03 +00:00
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int isPasswordEnabled;
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char * username;
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char * password;
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2008-05-18 16:44:30 +00:00
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char * acl;
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};
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2008-06-05 04:02:46 +00:00
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#define dbgmsg(fmt...) tr_deepLog(__FILE__, __LINE__, MY_NAME, ##fmt )
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2008-05-18 16:44:30 +00:00
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static void
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handle_rpc( struct shttpd_arg * arg )
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{
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struct tr_rpc_server * s = arg->user_data;
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2008-06-10 17:13:56 +00:00
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s->lastRequestTime = time( NULL );
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2008-05-18 16:44:30 +00:00
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if( !EVBUFFER_LENGTH( s->out ) )
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{
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int len = 0;
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char * response = NULL;
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const char * request_method = shttpd_get_env( arg, "REQUEST_METHOD" );
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const char * query_string = shttpd_get_env( arg, "QUERY_STRING" );
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if( query_string && *query_string )
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response = tr_rpc_request_exec_uri( s->session,
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query_string,
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strlen( query_string ),
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&len );
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else if( !strcmp( request_method, "POST" ) )
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{
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evbuffer_add( s->in, arg->in.buf, arg->in.len );
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arg->in.num_bytes = arg->in.len;
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2008-05-19 18:16:58 +00:00
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if( arg->flags & SHTTPD_MORE_POST_DATA )
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2008-05-18 16:44:30 +00:00
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return;
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2008-05-19 18:16:58 +00:00
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response = tr_rpc_request_exec_json( s->session,
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EVBUFFER_DATA( s->in ),
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EVBUFFER_LENGTH( s->in ),
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&len );
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2008-05-18 16:44:30 +00:00
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evbuffer_drain( s->in, EVBUFFER_LENGTH( s->in ) );
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}
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evbuffer_add_printf( s->out, "HTTP/1.1 200 OK\r\n"
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2008-05-20 17:33:54 +00:00
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"Content-Type: application/json\r\n"
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2008-05-18 16:44:30 +00:00
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"Content-Length: %d\r\n"
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"\r\n"
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"%*.*s\r\n", len, len, len, response );
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tr_free( response );
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}
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if( EVBUFFER_LENGTH( s->out ) )
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{
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const int n = MIN( ( int )EVBUFFER_LENGTH( s->out ), arg->out.len );
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memcpy( arg->out.buf, EVBUFFER_DATA( s->out ), n );
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evbuffer_drain( s->out, n );
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arg->out.num_bytes = n;
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}
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if( !EVBUFFER_LENGTH( s->out ) )
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arg->flags |= SHTTPD_END_OF_OUTPUT;
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}
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static void
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rpcPulse( int socket UNUSED, short action UNUSED, void * vserver )
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{
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int interval;
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struct timeval tv;
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tr_rpc_server * server = vserver;
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2008-06-05 02:07:17 +00:00
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const time_t now = time( NULL );
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2008-05-18 16:44:30 +00:00
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assert( server );
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2008-06-25 11:34:35 +00:00
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if( server->ctx )
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shttpd_poll( server->ctx, 1 );
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2008-05-18 16:44:30 +00:00
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/* set a timer for the next pulse */
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2008-06-10 19:25:18 +00:00
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if( EVBUFFER_LENGTH( server->in ) || EVBUFFER_LENGTH( server->out ) )
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2008-05-18 16:44:30 +00:00
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interval = BUSY_INTERVAL_MSEC;
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2008-06-10 19:25:18 +00:00
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else if( now - server->lastRequestTime < 300 )
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2008-05-18 16:44:30 +00:00
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interval = IDLE_INTERVAL_MSEC;
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2008-06-10 19:25:18 +00:00
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else
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2008-06-05 02:07:17 +00:00
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interval = UNUSED_INTERVAL_MSEC;
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2008-05-18 16:44:30 +00:00
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tv = tr_timevalMsec( interval );
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evtimer_add( &server->timer, &tv );
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}
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2008-06-05 16:23:03 +00:00
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static void
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getPasswordFile( tr_rpc_server * server, char * buf, int buflen )
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{
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tr_buildPath( buf, buflen, tr_sessionGetConfigDir( server->session ),
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"htpasswd",
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NULL );
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}
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2008-05-18 16:44:30 +00:00
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static void
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startServer( tr_rpc_server * server )
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{
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2008-06-05 04:02:46 +00:00
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dbgmsg( "in startServer; current context is %p", server->ctx );
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2008-05-18 16:44:30 +00:00
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if( !server->ctx )
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{
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char ports[128];
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2008-06-05 16:23:03 +00:00
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char passwd[MAX_PATH_LENGTH];
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2008-06-24 21:39:07 +00:00
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char clutchDir[MAX_PATH_LENGTH];
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char * clutchAlias;
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2008-06-05 02:07:17 +00:00
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struct timeval tv = tr_timevalMsec( UNUSED_INTERVAL_MSEC );
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2008-05-18 16:44:30 +00:00
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2008-06-24 21:39:07 +00:00
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tr_buildPath( clutchDir, sizeof( clutchDir ), tr_sessionGetConfigDir( server->session ), "clutch", NULL );
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clutchAlias = tr_strdup_printf( "%s=%s", "/transmission/clutch", clutchDir );
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2008-06-05 16:23:03 +00:00
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getPasswordFile( server, passwd, sizeof( passwd ) );
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if( !server->isPasswordEnabled )
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unlink( passwd );
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else
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2008-06-05 17:32:36 +00:00
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edit_passwords( passwd, MY_REALM, server->username, server->password );
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2008-06-05 16:23:03 +00:00
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2008-05-18 16:44:30 +00:00
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server->ctx = shttpd_init( );
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snprintf( ports, sizeof( ports ), "%d", server->port );
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2008-06-18 22:01:15 +00:00
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shttpd_register_uri( server->ctx, "/transmission/rpc", handle_rpc, server );
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2008-06-24 21:39:07 +00:00
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shttpd_set_option(server->ctx, "aliases", clutchAlias );
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2008-05-18 16:44:30 +00:00
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shttpd_set_option( server->ctx, "ports", ports );
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shttpd_set_option( server->ctx, "dir_list", "0" );
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2008-06-24 21:39:07 +00:00
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//shttpd_set_option( server->ctx, "root", "/dev/null" );
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2008-06-05 16:23:03 +00:00
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shttpd_set_option( server->ctx, "auth_realm", MY_REALM );
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2008-06-05 04:02:46 +00:00
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if( server->acl ) {
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dbgmsg( "setting acl [%s]", server->acl );
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2008-05-18 16:44:30 +00:00
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shttpd_set_option( server->ctx, "acl", server->acl );
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2008-06-05 04:02:46 +00:00
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}
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2008-06-05 16:23:03 +00:00
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if( server->isPasswordEnabled ) {
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2008-06-18 22:01:15 +00:00
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char * buf = tr_strdup_printf( "/transmission/rpc=%s", passwd );
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2008-06-05 16:23:03 +00:00
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shttpd_set_option( server->ctx, "protect", buf );
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tr_free( buf );
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}
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2008-05-18 16:44:30 +00:00
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evtimer_set( &server->timer, rpcPulse, server );
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evtimer_add( &server->timer, &tv );
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2008-06-24 21:39:07 +00:00
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tr_free( clutchAlias );
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2008-05-18 16:44:30 +00:00
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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->ctx )
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{
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2008-06-05 16:23:03 +00:00
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char passwd[MAX_PATH_LENGTH];
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getPasswordFile( server, passwd, sizeof( passwd ) );
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unlink( passwd );
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2008-05-18 16:44:30 +00:00
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evtimer_del( &server->timer );
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shttpd_fini( server->ctx );
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server->ctx = NULL;
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}
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}
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void
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tr_rpcSetEnabled( tr_rpc_server * server, int isEnabled )
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{
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if( !isEnabled && server->ctx )
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stopServer( server );
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if( isEnabled && !server->ctx )
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startServer( server );
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}
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int
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tr_rpcIsEnabled( const tr_rpc_server * server )
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{
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return server->ctx != NULL;
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}
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void
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tr_rpcSetPort( tr_rpc_server * server, int port )
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{
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if( server->port != port )
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{
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server->port = port;
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if( server->ctx )
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{
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stopServer( server );
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startServer( server );
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}
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}
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}
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int
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tr_rpcGetPort( const tr_rpc_server * server )
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{
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return server->port;
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}
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2008-06-05 16:23:03 +00:00
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/****
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***** ACL
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****/
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2008-06-02 19:44:19 +00:00
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/*
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* DELIM_CHARS, FOR_EACH_WORD_IN_LIST, isbyte, and testACL are from, or modified from,
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* shttpd, written by Sergey Lyubka under this license:
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* "THE BEER-WARE LICENSE" (Revision 42):
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* Sergey Lyubka wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return.
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*/
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2008-06-09 23:58:31 +00:00
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#define DELIM_CHARS "," /* Separators for lists */
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2008-06-02 19:44:19 +00:00
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#define FOR_EACH_WORD_IN_LIST(s,len) \
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for (; s != NULL && (len = strcspn(s, DELIM_CHARS)) != 0; \
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s += len, s+= strspn(s, DELIM_CHARS))
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static int isbyte(int n) { return (n >= 0 && n <= 255); }
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static char*
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testACL( const char * s )
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{
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int len;
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FOR_EACH_WORD_IN_LIST(s, len)
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{
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char flag;
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int a, b, c, d, n, mask;
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if( sscanf(s, "%c%d.%d.%d.%d%n",&flag,&a,&b,&c,&d,&n) != 5 )
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return tr_strdup_printf( _( "[%s]: subnet must be [+|-]x.x.x.x[/x]" ), s );
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if( flag != '+' && flag != '-')
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return tr_strdup_printf( _( "[%s]: flag must be + or -" ), s );
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if( !isbyte(a) || !isbyte(b) || !isbyte(c) || !isbyte(d) )
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return tr_strdup_printf( _( "[%s]: bad ip address" ), s );
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if( sscanf(s + n, "/%d", &mask) == 1 && ( mask<0 || mask>32 ) )
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return tr_strdup_printf( _( "[%s]: bad subnet mask %d" ), s, n );
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}
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return NULL;
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}
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2008-06-04 17:14:58 +00:00
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/* 192.*.*.* --> 192.0.0.0/8
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192.64.*.* --> 192.64.0.0/16
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192.64.1.* --> 192.64.1.0/24
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192.64.1.2 --> 192.64.1.2/32 */
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static void
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cidrizeOne( const char * in, int len, struct evbuffer * out )
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{
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int stars = 0;
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const char * pch;
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const char * end;
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char zero = '0';
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char huh = '?';
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for( pch=in, end=pch+len; pch!=end; ++pch ) {
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if( stars && isdigit(*pch) )
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evbuffer_add( out, &huh, 1 );
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else if( *pch!='*' )
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evbuffer_add( out, pch, 1 );
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else {
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evbuffer_add( out, &zero, 1 );
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++stars;
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}
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}
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evbuffer_add_printf( out, "/%d", (32-(stars*8)));
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}
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char*
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cidrize( const char * acl )
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{
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int len;
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const char * walk = acl;
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char * ret;
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struct evbuffer * out = evbuffer_new( );
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FOR_EACH_WORD_IN_LIST( walk, len )
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{
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cidrizeOne( walk, len, out );
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2008-06-09 23:28:14 +00:00
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evbuffer_add_printf( out, "," );
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2008-06-04 17:14:58 +00:00
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}
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|
|
|
|
2008-06-11 15:17:59 +00:00
|
|
|
/* the -1 is to eat the final ", " */
|
|
|
|
ret = tr_strndup( (char*) EVBUFFER_DATA(out), EVBUFFER_LENGTH(out)-1 );
|
2008-06-04 17:14:58 +00:00
|
|
|
evbuffer_free( out );
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2008-06-02 19:44:19 +00:00
|
|
|
int
|
2008-06-04 17:14:58 +00:00
|
|
|
tr_rpcTestACL( const tr_rpc_server * server UNUSED,
|
|
|
|
const char * acl,
|
|
|
|
char ** setme_errmsg )
|
2008-05-18 16:44:30 +00:00
|
|
|
{
|
2008-06-04 19:46:37 +00:00
|
|
|
int err = 0;
|
2008-06-04 17:14:58 +00:00
|
|
|
char * cidr = cidrize( acl );
|
|
|
|
char * errmsg = testACL( cidr );
|
2008-06-02 19:44:19 +00:00
|
|
|
if( errmsg )
|
|
|
|
{
|
2008-06-04 04:49:45 +00:00
|
|
|
if( setme_errmsg )
|
|
|
|
*setme_errmsg = errmsg;
|
2008-06-04 06:36:50 +00:00
|
|
|
else
|
|
|
|
tr_free( errmsg );
|
2008-06-04 19:46:37 +00:00
|
|
|
err = -1;
|
2008-06-02 19:44:19 +00:00
|
|
|
}
|
2008-06-04 17:14:58 +00:00
|
|
|
tr_free( cidr );
|
2008-06-04 19:46:37 +00:00
|
|
|
return err;
|
2008-06-04 17:14:58 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
tr_rpcSetACL( tr_rpc_server * server,
|
|
|
|
const char * acl,
|
|
|
|
char ** setme_errmsg )
|
|
|
|
{
|
|
|
|
char * cidr = cidrize( acl );
|
2008-06-04 19:46:37 +00:00
|
|
|
const int err = tr_rpcTestACL( server, cidr, setme_errmsg );
|
2008-06-04 17:14:58 +00:00
|
|
|
|
2008-06-05 04:02:46 +00:00
|
|
|
if( !err )
|
2008-06-02 19:44:19 +00:00
|
|
|
{
|
2008-06-04 17:14:58 +00:00
|
|
|
const int isRunning = server->ctx != NULL;
|
|
|
|
|
2008-06-02 19:44:19 +00:00
|
|
|
if( isRunning )
|
|
|
|
stopServer( server );
|
2008-05-18 16:44:30 +00:00
|
|
|
|
2008-06-02 19:44:19 +00:00
|
|
|
tr_free( server->acl );
|
2008-06-04 17:14:58 +00:00
|
|
|
server->acl = tr_strdup( cidr );
|
2008-06-05 04:02:46 +00:00
|
|
|
dbgmsg( "setting our ACL to [%s]", server->acl );
|
2008-05-18 16:44:30 +00:00
|
|
|
|
2008-06-02 19:44:19 +00:00
|
|
|
if( isRunning )
|
|
|
|
startServer( server );
|
|
|
|
}
|
2008-06-08 04:23:56 +00:00
|
|
|
tr_free( cidr );
|
2008-06-02 19:44:19 +00:00
|
|
|
|
2008-06-04 19:46:37 +00:00
|
|
|
return err;
|
2008-05-18 16:44:30 +00:00
|
|
|
}
|
|
|
|
|
2008-06-05 16:23:03 +00:00
|
|
|
char*
|
2008-05-18 16:44:30 +00:00
|
|
|
tr_rpcGetACL( const tr_rpc_server * server )
|
|
|
|
{
|
2008-06-05 16:23:03 +00:00
|
|
|
return tr_strdup( server->acl ? server->acl : "" );
|
|
|
|
}
|
|
|
|
|
|
|
|
/****
|
|
|
|
***** PASSWORD
|
|
|
|
****/
|
|
|
|
|
|
|
|
void
|
|
|
|
tr_rpcSetUsername( tr_rpc_server * server,
|
|
|
|
const char * username )
|
|
|
|
{
|
|
|
|
const int isRunning = server->ctx != NULL;
|
|
|
|
|
|
|
|
if( isRunning )
|
|
|
|
stopServer( server );
|
|
|
|
|
|
|
|
tr_free( server->username );
|
|
|
|
server->username = tr_strdup( username );
|
|
|
|
dbgmsg( "setting our Username to [%s]", server->username );
|
|
|
|
|
|
|
|
if( isRunning )
|
|
|
|
startServer( server );
|
|
|
|
}
|
|
|
|
|
|
|
|
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 )
|
|
|
|
{
|
|
|
|
const int isRunning = server->ctx != NULL;
|
|
|
|
|
|
|
|
if( isRunning )
|
|
|
|
stopServer( server );
|
|
|
|
|
|
|
|
tr_free( server->password );
|
|
|
|
server->password = tr_strdup( password );
|
|
|
|
dbgmsg( "setting our Password to [%s]", server->password );
|
|
|
|
|
|
|
|
if( isRunning )
|
|
|
|
startServer( server );
|
|
|
|
}
|
|
|
|
|
|
|
|
char*
|
|
|
|
tr_rpcGetPassword( const tr_rpc_server * server )
|
|
|
|
{
|
|
|
|
return tr_strdup( server->password ? server->password : "" );
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
tr_rpcSetPasswordEnabled( tr_rpc_server * server,
|
|
|
|
int isEnabled )
|
|
|
|
{
|
|
|
|
const int isRunning = server->ctx != NULL;
|
|
|
|
|
|
|
|
if( isRunning )
|
|
|
|
stopServer( server );
|
|
|
|
|
|
|
|
server->isPasswordEnabled = isEnabled;
|
|
|
|
dbgmsg( "setting 'password enabled' to %d", isEnabled );
|
|
|
|
|
|
|
|
if( isRunning )
|
|
|
|
startServer( server );
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
tr_rpcIsPasswordEnabled( const tr_rpc_server * server )
|
|
|
|
{
|
|
|
|
return server->isPasswordEnabled;
|
2008-05-18 16:44:30 +00:00
|
|
|
}
|
|
|
|
|
2008-06-05 16:23:03 +00:00
|
|
|
/****
|
|
|
|
***** LIFE CYCLE
|
|
|
|
****/
|
|
|
|
|
2008-05-18 16:44:30 +00:00
|
|
|
void
|
|
|
|
tr_rpcClose( tr_rpc_server ** ps )
|
|
|
|
{
|
|
|
|
tr_rpc_server * s = *ps;
|
|
|
|
*ps = NULL;
|
|
|
|
|
|
|
|
stopServer( s );
|
|
|
|
evbuffer_free( s->in );
|
|
|
|
evbuffer_free( s->out );
|
2008-05-19 18:16:58 +00:00
|
|
|
tr_free( s->acl );
|
2008-05-18 16:44:30 +00:00
|
|
|
tr_free( s );
|
|
|
|
}
|
|
|
|
|
|
|
|
tr_rpc_server *
|
|
|
|
tr_rpcInit( tr_handle * session,
|
|
|
|
int isEnabled,
|
|
|
|
int port,
|
2008-06-05 16:23:03 +00:00
|
|
|
const char * acl,
|
|
|
|
int isPasswordEnabled,
|
|
|
|
const char * username,
|
|
|
|
const char * password )
|
2008-05-18 16:44:30 +00:00
|
|
|
{
|
2008-06-02 19:57:16 +00:00
|
|
|
char * errmsg;
|
|
|
|
tr_rpc_server * s;
|
|
|
|
|
|
|
|
if(( errmsg = testACL ( acl )))
|
|
|
|
{
|
|
|
|
tr_nerr( MY_NAME, errmsg );
|
|
|
|
tr_free( errmsg );
|
|
|
|
acl = TR_DEFAULT_RPC_ACL;
|
|
|
|
tr_nerr( MY_NAME, "using fallback ACL \"%s\"", acl );
|
|
|
|
}
|
|
|
|
|
|
|
|
s = tr_new0( tr_rpc_server, 1 );
|
2008-05-18 16:44:30 +00:00
|
|
|
s->session = session;
|
|
|
|
s->port = port;
|
|
|
|
s->in = evbuffer_new( );
|
|
|
|
s->out = evbuffer_new( );
|
|
|
|
s->acl = tr_strdup( acl );
|
2008-06-05 16:23:03 +00:00
|
|
|
s->username = tr_strdup( username );
|
|
|
|
s->password = tr_strdup( password );
|
|
|
|
s->isPasswordEnabled = isPasswordEnabled;
|
2008-05-18 16:44:30 +00:00
|
|
|
|
|
|
|
if( isEnabled )
|
|
|
|
startServer( s );
|
|
|
|
return s;
|
|
|
|
}
|