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.
* 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 <string.h>
#include <libevent/event.h>
#include <shttpd/shttpd.h>
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#include "transmission.h"
#include "rpc.h"
#include "rpc-server.h"
#include "utils.h"
#define BUSY_INTERVAL_MSEC 30
#define IDLE_INTERVAL_MSEC 1000
struct tr_rpc_server
{
int port;
struct shttpd_ctx * ctx;
tr_handle * session;
struct evbuffer * in;
struct evbuffer * out;
struct event timer;
char * acl;
};
static void
handle_rpc( struct shttpd_arg * arg )
{
struct tr_rpc_server * s = arg->user_data;
if( !EVBUFFER_LENGTH( s->out ) )
{
int len = 0;
char * response = NULL;
const char * request_method = shttpd_get_env( arg, "REQUEST_METHOD" );
const char * query_string = shttpd_get_env( arg, "QUERY_STRING" );
if( query_string && *query_string )
response = tr_rpc_request_exec_uri( s->session,
query_string,
strlen( query_string ),
&len );
else if( !strcmp( request_method, "POST" ) )
{
evbuffer_add( s->in, arg->in.buf, arg->in.len );
arg->in.num_bytes = arg->in.len;
if( arg->flags & SHTTPD_MORE_POST_DATA )
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return;
response = tr_rpc_request_exec_json( s->session,
EVBUFFER_DATA( s->in ),
EVBUFFER_LENGTH( s->in ),
&len );
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evbuffer_drain( s->in, EVBUFFER_LENGTH( s->in ) );
}
evbuffer_add_printf( s->out, "HTTP/1.1 200 OK\r\n"
"Content-Type: application/json\r\n"
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"Content-Length: %d\r\n"
"\r\n"
"%*.*s\r\n", len, len, len, response );
tr_free( response );
}
if( EVBUFFER_LENGTH( s->out ) )
{
const int n = MIN( ( int )EVBUFFER_LENGTH( s->out ), arg->out.len );
memcpy( arg->out.buf, EVBUFFER_DATA( s->out ), n );
evbuffer_drain( s->out, n );
arg->out.num_bytes = n;
}
if( !EVBUFFER_LENGTH( s->out ) )
arg->flags |= SHTTPD_END_OF_OUTPUT;
}
static void
rpcPulse( int socket UNUSED, short action UNUSED, void * vserver )
{
int interval;
struct timeval tv;
tr_rpc_server * server = vserver;
assert( server );
shttpd_poll( server->ctx, 1 );
/* set a timer for the next pulse */
if( EVBUFFER_LENGTH( server->in ) || EVBUFFER_LENGTH( server->out ) )
interval = BUSY_INTERVAL_MSEC;
else
interval = IDLE_INTERVAL_MSEC;
tv = tr_timevalMsec( interval );
evtimer_add( &server->timer, &tv );
}
static void
startServer( tr_rpc_server * server )
{
if( !server->ctx )
{
char ports[128];
struct timeval tv = tr_timevalMsec( IDLE_INTERVAL_MSEC );
server->ctx = shttpd_init( );
snprintf( ports, sizeof( ports ), "%d", server->port );
shttpd_register_uri( server->ctx, "/transmission", handle_rpc, server );
shttpd_set_option( server->ctx, "ports", ports );
shttpd_set_option( server->ctx, "dir_list", "0" );
shttpd_set_option( server->ctx, "root", "/dev/null" );
if( server->acl )
shttpd_set_option( server->ctx, "acl", server->acl );
evtimer_set( &server->timer, rpcPulse, server );
evtimer_add( &server->timer, &tv );
}
}
static void
stopServer( tr_rpc_server * server )
{
if( server->ctx )
{
evtimer_del( &server->timer );
shttpd_fini( server->ctx );
server->ctx = NULL;
}
}
void
tr_rpcSetEnabled( tr_rpc_server * server, int isEnabled )
{
if( !isEnabled && server->ctx )
stopServer( server );
if( isEnabled && !server->ctx )
startServer( server );
}
int
tr_rpcIsEnabled( const tr_rpc_server * server )
{
return server->ctx != NULL;
}
void
tr_rpcSetPort( tr_rpc_server * server, int port )
{
if( server->port != port )
{
server->port = port;
if( server->ctx )
{
stopServer( server );
startServer( server );
}
}
}
int
tr_rpcGetPort( const tr_rpc_server * server )
{
return server->port;
}
/*
* DELIM_CHARS, FOR_EACH_WORD_IN_LIST, isbyte, and testACL are from, or modified from,
* shttpd, written by Sergey Lyubka under this license:
* "THE BEER-WARE LICENSE" (Revision 42):
* Sergey Lyubka wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return.
*/
#define DELIM_CHARS " ," /* Separators for lists */
#define FOR_EACH_WORD_IN_LIST(s,len) \
for (; s != NULL && (len = strcspn(s, DELIM_CHARS)) != 0; \
s += len, s+= strspn(s, DELIM_CHARS))
static int isbyte(int n) { return (n >= 0 && n <= 255); }
static char*
testACL( const char * s )
{
int len;
FOR_EACH_WORD_IN_LIST(s, len)
{
char flag;
int a, b, c, d, n, mask;
if( sscanf(s, "%c%d.%d.%d.%d%n",&flag,&a,&b,&c,&d,&n) != 5 )
return tr_strdup_printf( _( "[%s]: subnet must be [+|-]x.x.x.x[/x]" ), s );
if( flag != '+' && flag != '-')
return tr_strdup_printf( _( "[%s]: flag must be + or -" ), s );
if( !isbyte(a) || !isbyte(b) || !isbyte(c) || !isbyte(d) )
return tr_strdup_printf( _( "[%s]: bad ip address" ), s );
if( sscanf(s + n, "/%d", &mask) == 1 && ( mask<0 || mask>32 ) )
return tr_strdup_printf( _( "[%s]: bad subnet mask %d" ), s, n );
}
return NULL;
}
int
tr_rpcSetACL( tr_rpc_server * server, const char * acl, char ** setme_errmsg )
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{
const int isRunning = server->ctx != NULL;
int ret = 0;
char * errmsg = testACL( acl );
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if( errmsg )
{
*setme_errmsg = errmsg;
ret = -1;
}
else
{
if( isRunning )
stopServer( server );
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tr_free( server->acl );
server->acl = tr_strdup( acl );
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if( isRunning )
startServer( server );
}
return ret;
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}
const char*
tr_rpcGetACL( const tr_rpc_server * server )
{
return server->acl ? server->acl : "";
}
void
tr_rpcClose( tr_rpc_server ** ps )
{
tr_rpc_server * s = *ps;
*ps = NULL;
stopServer( s );
evbuffer_free( s->in );
evbuffer_free( s->out );
tr_free( s->acl );
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tr_free( s );
}
tr_rpc_server *
tr_rpcInit( tr_handle * session,
int isEnabled,
int port,
const char * acl )
{
tr_rpc_server * s = tr_new0( tr_rpc_server, 1 );
s->session = session;
s->port = port;
s->in = evbuffer_new( );
s->out = evbuffer_new( );
s->acl = tr_strdup( acl );
if( isEnabled )
startServer( s );
return s;
}