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transmission/libtransmission/upnp.c

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/******************************************************************************
* $Id$
*
* Copyright (c) 2006-2007 Transmission authors and contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "transmission.h"
#include "http.h"
#include "net.h"
#include "trcompat.h"
#include "upnp.h"
#include "xml.h"
/* uncomment this to log requests and responses to ~/transmission-upnp.log */
/* #define VERBOSE_LOG */
#define SSDP_ADDR "239.255.255.250"
#define SSDP_PORT 1900
#define SSDP_TYPE "upnp:rootdevice"
#define SSDP_SUBTYPE "ssdp:alive"
#define SSDP_FIRST_DELAY 3750 /* 3 3/4 seconds */
#define SSDP_MAX_DELAY 1800000 /* 30 minutes */
#define SERVICE_TYPE_IP "urn:schemas-upnp-org:service:WANIPConnection:1"
#define SERVICE_TYPE_PPP "urn:schemas-upnp-org:service:WANPPPConnection:1"
#define SOAP_ENVELOPE "http://schemas.xmlsoap.org/soap/envelope/"
#define LOOP_DETECT_THRESHOLD 10 /* error on 10 add/get/del state changes */
#define MAPPING_CHECK_INTERVAL 900000 /* 15 minutes */
#define HTTP_REQUEST_INTERVAL 500 /* half a second */
#define SOAP_METHOD_NOT_ALLOWED 405
#define IGD_GENERIC_ERROR 500
#define IGD_GENERIC_FAILED 501
#define IGD_NO_MAPPING_EXISTS 714
#define IGD_ADD_CONFLICT 718
#define IGD_NO_DYNAMIC_MAPPING 725
typedef struct tr_upnp_action_s
{
char * name;
int len;
struct { char * name; char * var; char dir; } * args;
} tr_upnp_action_t;
typedef struct tr_upnp_device_s
{
char * id;
char * host;
char * root;
int port;
int ppp;
char * soap;
char * scpd;
int mappedport;
char * myaddr;
#define UPNPDEV_STATE_ROOT 1
#define UPNPDEV_STATE_SCPD 2
#define UPNPDEV_STATE_READY 3
#define UPNPDEV_STATE_ADD 4
#define UPNPDEV_STATE_GET 5
#define UPNPDEV_STATE_DEL 6
#define UPNPDEV_STATE_MAPPED 7
#define UPNPDEV_STATE_ERROR 8
uint8_t state;
uint8_t looping;
uint64_t lastrequest;
uint64_t lastcheck;
unsigned int soapretry : 1;
tr_http_t * http;
tr_upnp_action_t getcmd;
tr_upnp_action_t addcmd;
tr_upnp_action_t delcmd;
struct tr_upnp_device_s * next;
} tr_upnp_device_t;
struct tr_upnp_s
{
int port;
int infd;
int outfd;
uint64_t lastdiscover;
uint64_t lastdelay;
unsigned int active : 1;
unsigned int discovering : 1;
tr_upnp_device_t * devices;
};
static int
sendSSDP( int fd );
static int
mcastStart();
static void
killSock( int * sock );
static void
killHttp( tr_http_t ** http );
static int
watchSSDP( tr_upnp_device_t ** devices, int fd );
static tr_tristate_t
recvSSDP( int fd, char * buf, int * len );
static int
parseSSDP( char * buf, int len, tr_http_header_t * headers );
static void
deviceAdd( tr_upnp_device_t ** first, const char * id, int idLen,
const char * url, int urlLen );
static void
deviceRemove( tr_upnp_device_t ** prevptr );
static int
deviceStop( tr_upnp_device_t * dev );
static int
devicePulse( tr_upnp_device_t * dev, int port );
static int
devicePulseHttp( tr_upnp_device_t * dev,
const char ** body, int * len );
static tr_http_t *
devicePulseGetHttp( tr_upnp_device_t * dev );
static int
parseRoot( const char * root, const char *buf, int len,
char ** soap, char ** scpd, int * ppp );
static void
addUrlbase( const char * base, char ** path );
static int
parseScpd( const char *buf, int len, tr_upnp_action_t * getcmd,
tr_upnp_action_t * addcmd, tr_upnp_action_t * delcmd );
static int
parseScpdArgs( const char * buf, const char * end,
tr_upnp_action_t * action, char dir );
static int
parseMapping( tr_upnp_device_t * dev, const char * buf, int len );
static char *
joinstrs( const char *, const char *, const char * );
static tr_http_t *
soapRequest( int retry, const char * host, int port, const char * path,
const char * type, tr_upnp_action_t * action, ... );
static void
actionSetup( tr_upnp_action_t * action, const char * name, int prealloc );
static void
actionFree( tr_upnp_action_t * action );
static int
actionAdd( tr_upnp_action_t * action, char * name, char * var,
char dir );
#define actionLookupVar( act, nam, len, dir ) \
( actionLookup( (act), (nam), (len), (dir), 0 ) )
#define actionLookupName( act, var, len, dir ) \
( actionLookup( (act), (var), (len), (dir), 1 ) )
static const char *
actionLookup( tr_upnp_action_t * action, const char * key, int len,
char dir, int getname );
#ifdef VERBOSE_LOG
static FILE * vlog = NULL;
#endif
tr_upnp_t *
tr_upnpInit()
{
tr_upnp_t * upnp;
upnp = calloc( 1, sizeof( *upnp ) );
if( NULL == upnp )
{
return NULL;
}
upnp->infd = -1;
upnp->outfd = -1;
#ifdef VERBOSE_LOG
if( NULL == vlog )
{
char path[MAX_PATH_LENGTH];
time_t stupid_api;
snprintf( path, sizeof path, "%s/transmission-upnp.log",
tr_getHomeDirectory());
vlog = fopen( path, "a" );
stupid_api = time( NULL );
fprintf( vlog, "opened log at %s\n\n", ctime( &stupid_api ) );
}
#endif
return upnp;
}
void
tr_upnpStart( tr_upnp_t * upnp )
{
if( !upnp->active )
{
tr_inf( "starting upnp" );
upnp->active = 1;
upnp->discovering = 1;
upnp->infd = mcastStart();
upnp->lastdiscover = 0;
upnp->lastdelay = SSDP_FIRST_DELAY / 2;
}
}
void
tr_upnpStop( tr_upnp_t * upnp )
{
if( upnp->active )
{
tr_inf( "stopping upnp" );
upnp->active = 0;
killSock( &upnp->infd );
killSock( &upnp->outfd );
}
}
int
tr_upnpStatus( tr_upnp_t * upnp )
{
tr_upnp_device_t * ii;
int ret;
if( !upnp->active )
{
ret = ( NULL == upnp->devices ?
TR_NAT_TRAVERSAL_DISABLED : TR_NAT_TRAVERSAL_UNMAPPING );
}
else if( NULL == upnp->devices )
{
ret = TR_NAT_TRAVERSAL_NOTFOUND;
}
else
{
ret = TR_NAT_TRAVERSAL_MAPPING;
for( ii = upnp->devices; NULL != ii; ii = ii->next )
{
if( UPNPDEV_STATE_ERROR == ii->state )
{
ret = TR_NAT_TRAVERSAL_ERROR;
}
else if( 0 < ii->mappedport )
{
ret = TR_NAT_TRAVERSAL_MAPPED;
break;
}
}
}
return ret;
}
void
tr_upnpForwardPort( tr_upnp_t * upnp, int port )
{
tr_dbg( "upnp port changed from %i to %i", upnp->port, port );
upnp->port = port;
}
void
tr_upnpRemoveForwarding( tr_upnp_t * upnp )
{
tr_dbg( "upnp port unset" );
upnp->port = 0;
}
void
tr_upnpClose( tr_upnp_t * upnp )
{
tr_upnpStop( upnp );
while( NULL != upnp->devices )
{
deviceRemove( &upnp->devices );
}
free( upnp );
#ifdef VERBOSE_LOG
if( NULL != vlog )
{
fflush( vlog );
}
#endif
}
void
tr_upnpPulse( tr_upnp_t * upnp )
{
tr_upnp_device_t ** ii;
if( upnp->active )
{
/* pulse on all known devices */
upnp->discovering = 1;
for( ii = &upnp->devices; NULL != *ii; ii = &(*ii)->next )
{
if( devicePulse( *ii, upnp->port ) )
{
upnp->discovering = 0;
}
}
/* send an SSDP discover message */
if( upnp->discovering &&
upnp->lastdelay + upnp->lastdiscover < tr_date() )
{
upnp->outfd = sendSSDP( upnp->outfd );
upnp->lastdiscover = tr_date();
upnp->lastdelay = MIN( upnp->lastdelay * 2, SSDP_MAX_DELAY );
}
/* try to receive SSDP messages */
watchSSDP( &upnp->devices, upnp->infd );
if( watchSSDP( &upnp->devices, upnp->outfd ) )
{
killSock( &upnp->outfd );
}
}
else
{
/* delete all mappings then delete devices */
ii = &upnp->devices;
while( NULL != *ii )
{
if( deviceStop( *ii ) )
{
deviceRemove( ii );
}
else
{
devicePulse( *ii, 0 );
ii = &(*ii)->next;
}
}
}
}
static int
sendSSDP( int fd )
{
char buf[102];
int len;
struct sockaddr_in sin;
if( 0 > fd )
{
fd = tr_netBindUDP( 0 );
if( 0 > fd )
{
return -1;
}
}
tr_dbg( "sending upnp ssdp discover message" );
len = snprintf( buf, sizeof( buf ),
"M-SEARCH * HTTP/1.1\r\n"
"Host: %s:%i\r\n"
"Man: \"ssdp:discover\"\r\n"
"ST: %s\r\n"
"MX: 3\r\n"
"\r\n",
SSDP_ADDR, SSDP_PORT, SSDP_TYPE );
/* if this assertion ever fails then just increase the size of buf */
assert( (int) sizeof( buf ) > len );
memset( &sin, 0, sizeof( sin ) );
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = inet_addr( SSDP_ADDR );
sin.sin_port = htons( SSDP_PORT );
#ifdef VERBOSE_LOG
fprintf( vlog, "send ssdp message, %i bytes:\n", len );
fwrite( buf, 1, len, vlog );
fputs( "\n\n", vlog );
#endif
if( 0 > sendto( fd, buf, len, 0,
(struct sockaddr*) &sin, sizeof( sin ) ) )
{
if( EAGAIN != errno )
{
tr_err( "Could not send SSDP discover message (%s)",
strerror( errno ) );
}
killSock( &fd );
return -1;
}
return fd;
}
static int
mcastStart()
{
int fd;
struct in_addr addr;
addr.s_addr = inet_addr( SSDP_ADDR );
fd = tr_netMcastOpen( SSDP_PORT, &addr );
if( 0 > fd )
{
return -1;
}
return fd;
}
static void
killSock( int * sock )
{
if( 0 <= *sock )
{
tr_netClose( *sock );
*sock = -1;
}
}
static void
killHttp( tr_http_t ** http )
{
tr_httpClose( *http );
*http = NULL;
}
static int
watchSSDP( tr_upnp_device_t ** devices, int fd )
{
/* XXX what if we get a huge SSDP packet? */
char buf[512];
int len;
tr_http_header_t hdr[] = {
/* first one must be type and second must be subtype */
{ NULL, NULL, 0 },
{ "NTS", NULL, 0 },
/* XXX should probably look at this
{ "Cache-control", NULL, 0 }, */
{ "Location", NULL, 0 },
{ "USN", NULL, 0 },
{ NULL, NULL, 0 }
};
enum { OFF_TYPE = 0, OFF_SUBTYPE, OFF_LOC, OFF_ID };
int ret;
if( 0 > fd )
{
return 0;
}
ret = 0;
for(;;)
{
len = sizeof( buf );
switch( recvSSDP( fd, buf, &len ) )
{
case TR_NET_WAIT:
return ret;
case TR_NET_ERROR:
return 1;
case TR_NET_OK:
ret = 1;
if( parseSSDP( buf, len, hdr ) &&
NULL != hdr[OFF_LOC].data &&
NULL != hdr[OFF_ID].data )
{
deviceAdd( devices, hdr[OFF_ID].data, hdr[OFF_ID].len,
hdr[OFF_LOC].data, hdr[OFF_LOC].len );
}
}
}
}
static tr_tristate_t
recvSSDP( int fd, char * buf, int * len )
{
if( 0 > fd )
{
return TR_NET_ERROR;
}
*len = tr_netRecv( fd, ( uint8_t * ) buf, *len );
if( TR_NET_BLOCK & *len )
{
return TR_NET_WAIT;
}
else if( TR_NET_CLOSE & *len )
{
tr_err( "Could not receive SSDP message (%s)", strerror( errno ) );
return TR_NET_ERROR;
}
else
{
#ifdef VERBOSE_LOG
fprintf( vlog, "receive ssdp message, %i bytes:\n", *len );
fwrite( buf, 1, *len, vlog );
fputs( "\n\n", vlog );
#endif
return TR_NET_OK;
}
}
static int
parseSSDP( char * buf, int len, tr_http_header_t * hdr )
{
char *method, *uri, *body;
int code;
body = NULL;
/* check for an HTTP NOTIFY request */
if( 0 <= tr_httpRequestType( buf, len, &method, &uri ) )
{
if( 0 == tr_strcasecmp( method, "NOTIFY" ) && 0 == strcmp( uri, "*" ) )
{
hdr[0].name = "NT";
body = tr_httpParse( buf, len, hdr );
if( NULL == hdr[1].name ||
0 != tr_strncasecmp( SSDP_SUBTYPE, hdr[1].data, hdr[1].len ) )
{
body = NULL;
}
else
{
tr_dbg( "found upnp ssdp notify request" );
}
}
free( method );
free( uri );
}
else
{
/* check for a response to our HTTP M-SEARCH request */
code = tr_httpResponseCode( buf, len );
if( TR_HTTP_STATUS_OK( code ) )
{
hdr[0].name = "ST";
body = tr_httpParse( buf, len, hdr );
if( NULL != body )
{
tr_dbg( "found upnp ssdp m-search response" );
}
}
}
/* did we find enough information to be useful? */
if( NULL != body )
{
/* the first header is the type */
if( NULL != hdr[0].data &&
0 == tr_strncasecmp( SSDP_TYPE, hdr[0].data, hdr[0].len ) )
{
return 1;
}
}
return 0;
}
static void
deviceAdd( tr_upnp_device_t ** first, const char * id, int idLen,
const char * url, int urlLen )
{
tr_upnp_device_t * ii;
for( ii = *first; NULL != ii; ii = ii->next )
{
if( 0 == tr_strncasecmp( ii->id, id, idLen ) )
{
/* this device may have gone away and came back, recheck it */
ii->lastcheck = 0;
return;
}
}
ii = malloc( sizeof( *ii ) );
if( NULL == ii )
{
return;
}
memset( ii, 0, sizeof( *ii ) );
if( tr_httpParseUrl( url, urlLen, &ii->host, &ii->port, &ii->root ) )
{
tr_err( "Invalid HTTP URL from UPnP" );
free( ii );
return;
}
ii->id = tr_strndup( id, idLen );
ii->state = UPNPDEV_STATE_ROOT;
actionSetup( &ii->getcmd, "GetSpecificPortMappingEntry", 8 );
actionSetup( &ii->addcmd, "AddPortMapping", 8 );
actionSetup( &ii->delcmd, "DeletePortMapping", 3 );
ii->next = *first;
*first = ii;
tr_inf( "new upnp device %s, port %i, path %s",
ii->host, ii->port, ii->root );
}
static void
deviceRemove( tr_upnp_device_t ** prevptr )
{
tr_upnp_device_t * dead;
dead = *prevptr;
*prevptr = dead->next;
tr_inf( "forgetting upnp device %s", dead->host );
free( dead->id );
free( dead->host );
free( dead->root );
free( dead->soap );
free( dead->scpd );
free( dead->myaddr );
if( NULL != dead->http )
{
killHttp( &dead->http );
}
actionFree( &dead->getcmd );
actionFree( &dead->addcmd );
actionFree( &dead->delcmd );
free( dead );
}
static int
deviceStop( tr_upnp_device_t * dev )
{
switch( dev->state )
{
case UPNPDEV_STATE_READY:
case UPNPDEV_STATE_ERROR:
return 1;
case UPNPDEV_STATE_MAPPED:
tr_dbg( "upnp device %s: stopping upnp, state mapped -> delete",
dev->host );
dev->state = UPNPDEV_STATE_DEL;
return 0;
default:
return 0;
}
}
static int
devicePulse( tr_upnp_device_t * dev, int port )
{
const char * body;
int len, code;
uint8_t laststate;
switch( dev->state )
{
case UPNPDEV_STATE_READY:
if( 0 < port )
{
tr_dbg( "upnp device %s: want mapping, state ready -> get",
dev->host );
dev->mappedport = port;
dev->state = UPNPDEV_STATE_GET;
break;
}
return 1;
case UPNPDEV_STATE_MAPPED:
if( port != dev->mappedport )
{
tr_dbg( "upnp device %s: change mapping, "
"state mapped -> delete", dev->host );
dev->state = UPNPDEV_STATE_DEL;
break;
}
if( tr_date() > dev->lastcheck + MAPPING_CHECK_INTERVAL )
{
tr_dbg( "upnp device %s: check mapping, "
"state mapped -> get", dev->host );
dev->state = UPNPDEV_STATE_GET;
}
return 1;
case UPNPDEV_STATE_ERROR:
return 0;
}
/* gcc can be pretty annoying about it's warnings sometimes */
len = 0;
body = NULL;
code = devicePulseHttp( dev, &body, &len );
if( 0 > code )
{
return 1;
}
if( LOOP_DETECT_THRESHOLD <= dev->looping )
{
tr_dbg( "upnp device %s: loop detected, state %hhu -> error",
dev->host, dev->state );
dev->state = UPNPDEV_STATE_ERROR;
dev->looping = 0;
killHttp( &dev->http );
return 1;
}
laststate = dev->state;
dev->state = UPNPDEV_STATE_ERROR;
switch( laststate )
{
case UPNPDEV_STATE_ROOT:
if( !TR_HTTP_STATUS_OK( code ) )
{
tr_dbg( "upnp device %s: fetch root failed with http code %i",
dev->host, code );
}
else if( parseRoot( dev->root, body, len,
&dev->soap, &dev->scpd, &dev->ppp ) )
{
tr_dbg( "upnp device %s: parse root failed", dev->host );
}
else
{
tr_dbg( "upnp device %s: found scpd \"%s\" and soap \"%s\"",
dev->root, dev->scpd, dev->soap );
tr_dbg( "upnp device %s: parsed root, state root -> scpd",
dev->host );
dev->state = UPNPDEV_STATE_SCPD;
}
break;
case UPNPDEV_STATE_SCPD:
if( !TR_HTTP_STATUS_OK( code ) )
{
tr_dbg( "upnp device %s: fetch scpd failed with http code %i",
dev->host, code );
}
else if( parseScpd( body, len, &dev->getcmd,
&dev->addcmd, &dev->delcmd ) )
{
tr_dbg( "upnp device %s: parse scpd failed", dev->host );
}
else
{
tr_dbg( "upnp device %s: parsed scpd, state scpd -> ready",
dev->host );
dev->state = UPNPDEV_STATE_READY;
dev->looping = 0;
}
break;
case UPNPDEV_STATE_ADD:
dev->looping++;
if( IGD_ADD_CONFLICT == code )
{
tr_dbg( "upnp device %s: add conflict, state add -> delete",
dev->host );
dev->state = UPNPDEV_STATE_DEL;
}
else if( TR_HTTP_STATUS_OK( code ) ||
IGD_GENERIC_ERROR == code || IGD_GENERIC_FAILED == code )
{
tr_dbg( "upnp device %s: add attempt, state add -> get",
dev->host );
dev->state = UPNPDEV_STATE_GET;
}
else
{
tr_dbg( "upnp device %s: add failed with http code %i",
dev->host, code );
}
break;
case UPNPDEV_STATE_GET:
dev->looping++;
if( TR_HTTP_STATUS_OK( code ) )
{
switch( parseMapping( dev, body, len ) )
{
case -1:
break;
case 0:
tr_dbg( "upnp device %s: invalid mapping, "
"state get -> delete", dev->host );
dev->state = UPNPDEV_STATE_DEL;
break;
case 1:
tr_dbg( "upnp device %s: good mapping, "
"state get -> mapped", dev->host );
dev->state = UPNPDEV_STATE_MAPPED;
dev->looping = 0;
dev->lastcheck = tr_date();
tr_inf( "upnp successful for port %i",
dev->mappedport );
break;
default:
assert( 0 );
break;
}
}
else if( IGD_NO_MAPPING_EXISTS == code ||
IGD_GENERIC_ERROR == code || IGD_GENERIC_FAILED == code )
{
tr_dbg( "upnp device %s: no mapping, state get -> add",
dev->host );
dev->state = UPNPDEV_STATE_ADD;
}
else
{
tr_dbg( "upnp device %s: get failed with http code %i",
dev->host, code );
}
break;
case UPNPDEV_STATE_DEL:
dev->looping++;
if( TR_HTTP_STATUS_OK( code ) || IGD_NO_MAPPING_EXISTS == code ||
IGD_GENERIC_ERROR == code || IGD_GENERIC_FAILED == code )
{
tr_dbg( "upnp device %s: deleted, state delete -> ready",
dev->host );
dev->state = UPNPDEV_STATE_READY;
dev->looping = 0;
}
else
{
tr_dbg( "upnp device %s: del failed with http code %i",
dev->host, code );
}
break;
default:
assert( 0 );
break;
}
dev->lastrequest = tr_date();
killHttp( &dev->http );
if( UPNPDEV_STATE_ERROR == dev->state )
{
tr_dbg( "upnp device %s: error, state %hhu -> error",
dev->host, laststate );
return 0;
}
return 1;
}
static tr_http_t *
makeHttp( int method, const char * host, int port, const char * path )
{
if( tr_httpIsUrl( path, -1 ) )
{
return tr_httpClientUrl( method, "%s", path );
}
else
{
return tr_httpClient( method, host, port, "%s", path );
}
}
static tr_http_t *
devicePulseGetHttp( tr_upnp_device_t * dev )
{
tr_http_t * ret;
char numstr[6];
const char * type;
#ifdef VERBOSE_LOG
const char * body;
int len;
#endif
ret = NULL;
switch( dev->state )
{
case UPNPDEV_STATE_ROOT:
if( !dev->soapretry )
{
ret = makeHttp( TR_HTTP_GET, dev->host, dev->port, dev->root );
}
break;
case UPNPDEV_STATE_SCPD:
if( !dev->soapretry )
{
ret = makeHttp( TR_HTTP_GET, dev->host, dev->port, dev->scpd );
}
break;
case UPNPDEV_STATE_ADD:
if( NULL == dev->myaddr )
{
ret = NULL;
break;
}
snprintf( numstr, sizeof( numstr ), "%i", dev->mappedport );
type = ( dev->ppp ? SERVICE_TYPE_PPP : SERVICE_TYPE_IP );
ret = soapRequest( dev->soapretry, dev->host, dev->port, dev->soap,
type, &dev->addcmd,
"PortMappingEnabled", "1",
"PortMappingLeaseDuration", "0",
"RemoteHost", "",
"ExternalPort", numstr,
"InternalPort", numstr,
"PortMappingProtocol", "TCP",
"InternalClient", dev->myaddr,
"PortMappingDescription", "Added by " TR_NAME,
NULL );
break;
case UPNPDEV_STATE_GET:
snprintf( numstr, sizeof( numstr ), "%i", dev->mappedport );
type = ( dev->ppp ? SERVICE_TYPE_PPP : SERVICE_TYPE_IP );
ret = soapRequest( dev->soapretry, dev->host, dev->port, dev->soap,
type, &dev->getcmd,
"RemoteHost", "",
"ExternalPort", numstr,
"PortMappingProtocol", "TCP",
NULL );
break;
case UPNPDEV_STATE_DEL:
snprintf( numstr, sizeof( numstr ), "%i", dev->mappedport );
type = ( dev->ppp ? SERVICE_TYPE_PPP : SERVICE_TYPE_IP );
ret = soapRequest( dev->soapretry, dev->host, dev->port, dev->soap,
type, &dev->delcmd,
"RemoteHost", "",
"ExternalPort", numstr,
"PortMappingProtocol", "TCP",
NULL );
break;
default:
assert( 0 );
break;
}
#ifdef VERBOSE_LOG
if( NULL != ret )
{
tr_httpGetHeaders( ret, &body, &len );
fprintf( vlog, "send http message, %i bytes (headers):\n", len );
fwrite( body, 1, len, vlog );
tr_httpGetBody( ret, &body, &len );
fprintf( vlog, "\n\nsend http message, %i bytes (body):\n", len );
fwrite( body, 1, len, vlog );
fputs( "\n\n", vlog );
}
#endif
return ret;
}
static int
devicePulseHttp( tr_upnp_device_t * dev,
const char ** body, int * len )
{
const char * headers;
int hlen, code;
if( NULL == dev->http )
{
if( tr_date() < dev->lastrequest + HTTP_REQUEST_INTERVAL )
{
return -1;
}
dev->lastrequest = tr_date();
dev->http = devicePulseGetHttp( dev );
if( NULL == dev->http )
{
tr_dbg( "upnp device %s: http init failed, state %hhu -> error",
dev->host, dev->state );
dev->state = UPNPDEV_STATE_ERROR;
dev->soapretry = 0;
return -1;
}
}
if( NULL == dev->myaddr )
{
dev->myaddr = tr_httpWhatsMyAddress( dev->http );
}
switch( tr_httpPulse( dev->http, &headers, &hlen ) )
{
case TR_NET_OK:
#ifdef VERBOSE_LOG
fprintf( vlog, "receive http message, %i bytes:\n", hlen );
fwrite( headers, 1, hlen, vlog );
fputs( "\n\n", vlog );
#endif
code = tr_httpResponseCode( headers, hlen );
if( SOAP_METHOD_NOT_ALLOWED == code && !dev->soapretry )
{
dev->soapretry = 1;
killHttp( &dev->http );
break;
}
dev->soapretry = 0;
*body = tr_httpParse( headers, hlen, NULL );
*len = ( NULL == *body ? 0 : hlen - ( *body - headers ) );
return code;
case TR_NET_ERROR:
killHttp( &dev->http );
if( dev->soapretry )
{
tr_dbg( "upnp device %s: http pulse failed, state %hhu -> error",
dev->host, dev->state );
dev->state = UPNPDEV_STATE_ERROR;
dev->soapretry = 0;
}
else
{
dev->soapretry = 1;
}
break;
case TR_NET_WAIT:
break;
}
return -1;
}
static int
parseRoot( const char * root, const char *buf, int len,
char ** soap, char ** scpd, int * ppp )
{
const char * end, * ii, * jj, * kk, * urlbase;
char * basedup;
*soap = NULL;
*scpd = NULL;
end = buf + len;
buf = tr_xmlFindTagContents( buf, end, "root" );
urlbase = tr_xmlFindTag( buf, end, "urlBase" );
urlbase = tr_xmlTagContents( urlbase, end );
buf = tr_xmlFindTagContents( buf, end, "device" );
if( tr_xmlFindTagVerifyContents( buf, end, "deviceType",
"urn:schemas-upnp-org:device:InternetGatewayDevice:1", 1 ) )
{
return 1;
}
buf = tr_xmlFindTag( buf, end, "deviceList" );
ii = tr_xmlTagContents( buf, end );
for( ; NULL != ii; ii = tr_xmlSkipTag( ii, end ) )
{
ii = tr_xmlFindTag( ii, end, "device" );
buf = tr_xmlTagContents( ii, end );
if( tr_xmlFindTagVerifyContents( buf, end, "deviceType",
"urn:schemas-upnp-org:device:WANDevice:1", 1 ) )
{
continue;
}
buf = tr_xmlFindTag( buf, end, "deviceList" );
jj = tr_xmlTagContents( buf, end );
for( ; NULL != jj; jj = tr_xmlSkipTag( jj, end ) )
{
jj = tr_xmlFindTag( jj, end, "device" );
buf = tr_xmlTagContents( jj, end );
if( tr_xmlFindTagVerifyContents( buf, end, "deviceType",
"urn:schemas-upnp-org:device:WANConnectionDevice:1", 1 ) )
{
continue;
}
buf = tr_xmlFindTag( buf, end, "serviceList" );
kk = tr_xmlTagContents( buf, end );
for( ; NULL != kk; kk = tr_xmlSkipTag( kk, end ) )
{
kk = tr_xmlFindTag( kk, end, "service" );
buf = tr_xmlTagContents( kk, end );
if( !tr_xmlFindTagVerifyContents( buf, end, "serviceType",
SERVICE_TYPE_IP, 1 ) )
{
*soap = tr_xmlDupTagContents( buf, end, "controlURL");
*scpd = tr_xmlDupTagContents( buf, end, "SCPDURL");
*ppp = 0;
break;
}
/* XXX we should save all services of both types and
try adding mappings for each in turn */
else if( !tr_xmlFindTagVerifyContents( buf, end, "serviceType",
SERVICE_TYPE_PPP, 1 ) )
{
*soap = tr_xmlDupTagContents( buf, end, "controlURL");
*scpd = tr_xmlDupTagContents( buf, end, "SCPDURL");
*ppp = 1;
break;
}
}
}
}
if( NULL == urlbase )
{
basedup = strrchr( root, '/' );
assert( NULL != basedup );
basedup = tr_strndup( root, basedup - root + 1 );
}
else
{
basedup = tr_xmlDupContents( urlbase, end );
}
addUrlbase( basedup, soap );
addUrlbase( basedup, scpd );
free( basedup );
if( NULL != *soap && NULL != *scpd )
{
return 0;
}
return 1;
}
static void
addUrlbase( const char * base, char ** path )
{
const char * middle;
int len;
char * joined;
if( NULL == base || NULL == *path ||
'/' == **path || tr_httpIsUrl( *path, -1 ) )
{
return;
}
len = strlen( base );
middle = ( 0 >= len || '/' != base[len-1] ? "/" : "" );
joined = joinstrs( base, middle, *path );
free( *path );
*path = joined;
}
static int
parseScpd( const char * buf, int len, tr_upnp_action_t * getcmd,
tr_upnp_action_t * addcmd, tr_upnp_action_t * delcmd )
{
const char * end, * next, * sub, * name;
end = buf + len;
next = buf;
next = tr_xmlFindTagContents( next, end, "scpd" );
next = tr_xmlFindTagContents( next, end, "actionList" );
while( NULL != next )
{
next = tr_xmlFindTag( next, end, "action" );
sub = tr_xmlTagContents( next, end );
name = tr_xmlFindTagContents( sub, end, "name" );
sub = tr_xmlFindTagContents( sub, end, "argumentList" );
if( !tr_xmlVerifyContents( name, end, getcmd->name, 1 ) )
{
if( parseScpdArgs( sub, end, getcmd, 'i' ) ||
parseScpdArgs( sub, end, getcmd, 'o' ) )
{
return 1;
}
}
else if( !tr_xmlVerifyContents( name, end, addcmd->name, 1 ) )
{
if( parseScpdArgs( sub, end, addcmd, 'i' ) )
{
return 1;
}
}
else if( !tr_xmlVerifyContents( name, end, delcmd->name, 1 ) )
{
if( parseScpdArgs( sub, end, delcmd, 'i' ) )
{
return 1;
}
}
next = tr_xmlSkipTag( next, end );
}
return 0;
}
static int
parseScpdArgs( const char * buf, const char * end,
tr_upnp_action_t * action, char dir )
{
const char * sub, * which;
char * name, * var;
assert( 'i' == dir || 'o' == dir );
which = ( 'i' == dir ? "in" : "out" );
while( NULL != buf )
{
sub = tr_xmlFindTagContents( buf, end, "argument" );
if( !tr_xmlFindTagVerifyContents( sub, end, "direction", which, 1 ) )
{
name = tr_xmlDupTagContents( sub, end, "name" );
var = tr_xmlDupTagContents( sub, end, "relatedStateVariable" );
if( NULL == name || NULL == var )
{
free( name );
free( var );
}
else if( actionAdd( action, name, var, dir ) )
{
return 1;
}
}
buf = tr_xmlSkipTag( buf, end );
}
return 0;
}
static int
parseMapping( tr_upnp_device_t * dev, const char * buf, int len )
{
const char * end, * down, * next, * var;
int varlen, pret, cret, eret;
char * val;
assert( 0 < dev->mappedport );
if( NULL == dev->myaddr )
{
return -1;
}
pret = -1;
cret = -1;
eret = -1;
end = buf + len;
down = buf;
down = tr_xmlFindTagContents( down, end, "Envelope" );
down = tr_xmlFindTagContents( down, end, "Body" );
down = tr_xmlFindTagContents( down, end,
"GetSpecificPortMappingEntryResponse" );
next = down;
while( NULL != next )
{
var = tr_xmlTagName( next, end, &varlen );
var = actionLookupVar( &dev->getcmd, var, varlen, 'o' );
if( NULL != var )
{
val = tr_xmlDupContents( tr_xmlTagContents( next, end ), end );
if( 0 == tr_strcasecmp( "InternalPort", var ) )
{
pret = ( strtol( val, NULL, 10 ) == dev->mappedport ? 1 : 0 );
}
else if( 0 == tr_strcasecmp( "InternalClient", var ) )
{
cret = ( 0 == strcmp( dev->myaddr, val ) ? 1 : 0 );
}
else if( 0 == tr_strcasecmp( "PortMappingEnabled", var ) )
{
eret = ( 0 == strcmp( "1", val ) ? 1 : 0 );
}
free( val );
}
next = tr_xmlSkipTag( next, end );
}
return MIN( MIN( pret, cret), eret );
}
static char *
joinstrs( const char * first, const char * delim, const char * second )
{
char * ret;
int len1, len2, len3;
len1 = strlen( first );
len2 = strlen( delim );
len3 = strlen( second );
ret = malloc( len1 + len2 + len3 + 1 );
if( NULL == ret )
{
return NULL;
}
memcpy( ret, first, len1 );
memcpy( ret + len1, delim, len2 );
memcpy( ret + len1 + len2, second, len3 );
ret[len1 + len2 + len3] = '\0';
return ret;
}
static tr_http_t *
soapRequest( int retry, const char * host, int port, const char * path,
const char * type, tr_upnp_action_t * action, ... )
{
tr_http_t * http;
va_list ap;
const char * name, * value;
int method;
char * actstr;
method = ( retry ? TR_HTTP_M_POST : TR_HTTP_POST );
http = makeHttp( method, host, port, path );
if( NULL != http )
{
tr_httpAddHeader( http, "Content-type",
"text/xml; encoding=\"utf-8\"" );
actstr = NULL;
asprintf( &actstr, "\"%s#%s\"", type, action->name );
tr_httpAddHeader( http, "SOAPAction", actstr );
free( actstr );
if( retry )
{
tr_httpAddHeader( http, "Man", "\"" SOAP_ENVELOPE "\"" );
}
tr_httpAddBody( http,
"<?xml version=\"1.0\" encoding=\"utf-8\" ?>"
"<s:Envelope"
" xmlns:s=\"" SOAP_ENVELOPE "\""
" s:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">"
" <s:Body>"
" <u:%s xmlns:u=\"%s\">", action->name, type );
va_start( ap, action );
do
{
name = va_arg( ap, const char * );
value = NULL;
name = actionLookupName( action, name, -1, 'i' );
if( NULL != name )
{
value = va_arg( ap, const char * );
if( NULL != value )
{
tr_httpAddBody( http,
" <%s>%s</%s>", name, value, name );
}
else
{
tr_httpAddBody( http,
" <%s></%s>", name, name );
}
}
}
while( NULL != name && NULL != value );
va_end( ap );
tr_httpAddBody( http,
" </u:%s>"
" </s:Body>"
"</s:Envelope>", action->name );
}
return http;
}
static void
actionSetup( tr_upnp_action_t * action, const char * name, int prealloc )
{
action->name = strdup( name );
assert( NULL == action->args );
action->args = malloc( sizeof( *action->args ) * prealloc );
memset( action->args, 0, sizeof( *action->args ) * prealloc );
action->len = prealloc;
}
static void
actionFree( tr_upnp_action_t * act )
{
free( act->name );
while( 0 < act->len )
{
act->len--;
free( act->args[act->len].name );
free( act->args[act->len].var );
}
free( act->args );
}
static int
actionAdd( tr_upnp_action_t * act, char * name, char * var, char dir )
{
int ii;
void * newbuf;
assert( 'i' == dir || 'o' == dir );
ii = 0;
while( ii < act->len && NULL != act->args[ii].name )
{
ii++;
}
if( ii == act->len )
{
newbuf = realloc( act->args, sizeof( *act->args ) * ( act->len + 1 ) );
if( NULL == newbuf )
{
return 1;
}
act->args = newbuf;
act->len++;
}
act->args[ii].name = name;
act->args[ii].var = var;
act->args[ii].dir = dir;
return 0;
}
static const char *
actionLookup( tr_upnp_action_t * act, const char * key, int len,
char dir, int getname )
{
int ii;
assert( 'i' == dir || 'o' == dir );
if( NULL == key || 0 == len )
{
return NULL;
}
if( 0 > len )
{
len = strlen( key );
}
for( ii = 0; ii < act->len; ii++ )
{
if( NULL != act->args[ii].name && dir == act->args[ii].dir )
{
if( !getname &&
0 == tr_strncasecmp( act->args[ii].name, key, len ) )
{
return act->args[ii].var;
}
else if( getname &&
0 == tr_strncasecmp( act->args[ii].var, key, len ) )
{
return act->args[ii].name;
}
}
}
return NULL;
}
#if 0
/* this code is used for standalone root parsing for debugging purposes */
/* cc -g -Wall -D__TRANSMISSION__ -o upnp upnp.c xml.c utils.c */
int
main( int argc, char * argv[] )
{
struct stat sb;
char * data, * soap, * scpd;
int fd, ppp;
ssize_t res;
if( 3 != argc )
{
printf( "usage: %s root-url root-file\n", argv[0] );
return 0;
}
tr_msgInit();
tr_setMessageLevel( 9 );
if( 0 > stat( argv[2], &sb ) )
{
tr_err( "failed to stat file %s: %s", argv[2], strerror( errno ) );
return 1;
}
data = malloc( sb.st_size );
if( NULL == data )
{
tr_err( "failed to malloc %zd bytes", ( size_t )sb.st_size );
return 1;
}
fd = open( argv[2], O_RDONLY );
if( 0 > fd )
{
tr_err( "failed to open file %s: %s", argv[2], strerror( errno ) );
free( data );
return 1;
}
res = read( fd, data, sb.st_size );
if( sb.st_size > res )
{
tr_err( "failed to read file %s: %s", argv[2],
( 0 > res ? strerror( errno ) : "short read count" ) );
close( fd );
free( data );
return 1;
}
close( fd );
if( parseRoot( argv[1], data, sb.st_size, &soap, &scpd, &ppp ) )
{
tr_err( "root parsing failed" );
}
else
{
tr_err( "soap=%s scpd=%s ppp=%s", soap, scpd, ( ppp ? "yes" : "no" ) );
free( soap );
free( scpd );
}
free( data );
return 0;
}
int tr_netMcastOpen( int port, struct in_addr addr ) { assert( 0 ); }
int tr_netBind ( int port, int type ) { assert( 0 ); }
void tr_netClose ( int s ) { assert( 0 ); }
int tr_netRecvFrom( int s, uint8_t * buf, int size, struct sockaddr_in * sin ) { assert( 0 ); }
int tr_httpRequestType( const char * data, int len,
char ** method, char ** uri ) { assert( 0 ); }
int tr_httpResponseCode( const char * data, int len ) { assert( 0 ); }
char * tr_httpParse( const char * data, int len, tr_http_header_t *headers ) { assert( 0 ); }
int tr_httpIsUrl( const char * u, int l ) { assert( 0 ); }
int tr_httpParseUrl( const char * u, int l, char ** h, int * p, char ** q ) { assert( 0 ); }
tr_http_t * tr_httpClient( int t, const char * h, int p, const char * u, ... ) { assert( 0 ); }
tr_http_t * tr_httpClientUrl( int t, const char * u, ... ) { assert( 0 ); }
void tr_httpAddHeader( tr_http_t * h, const char * n, const char * v ) { assert( 0 ); }
void tr_httpAddBody( tr_http_t * h, const char * b, ... ) { assert( 0 ); }
tr_tristate_t tr_httpPulse( tr_http_t * h, const char ** b, int * l ) { assert( 0 ); }
char * tr_httpWhatsMyAddress( tr_http_t * h ) { assert( 0 ); }
void tr_httpClose( tr_http_t * h ) { assert( 0 ); }
void tr_lockInit ( tr_lock_t * l ) {}
int pthread_mutex_lock( pthread_mutex_t * m ) { return 0; }
int pthread_mutex_unlock( pthread_mutex_t * m ) { return 0; }
#endif
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