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transmission/libtransmission/net.c

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/******************************************************************************
* $Id$
*
* Copyright (c) 2005-2008 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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <sys/types.h>
#ifdef WIN32
#include <winsock2.h> /* inet_addr */
#include <WS2tcpip.h>
#else
#include <arpa/inet.h> /* inet_addr */
#include <netdb.h>
#include <fcntl.h>
#endif
#include <evutil.h>
#include "transmission.h"
#include "fdlimit.h"
#include "natpmp.h"
#include "net.h"
#include "peer-io.h"
#include "platform.h"
#include "utils.h"
#ifndef IN_MULTICAST
#define IN_MULTICAST( a ) ( ( ( a ) & 0xf0000000 ) == 0xe0000000 )
#endif
const tr_address tr_in6addr_any = { TR_AF_INET6, { IN6ADDR_ANY_INIT } };
const tr_address tr_inaddr_any = { TR_AF_INET,
{ { { { INADDR_ANY, 0x00, 0x00, 0x00 } } } } };
#ifdef WIN32
static const char *
inet_ntop(int af, const void *src, char *dst, socklen_t cnt)
{
if (af == AF_INET)
{
struct sockaddr_in in;
memset(&in, 0, sizeof(in));
in.sin_family = AF_INET;
memcpy(&in.sin_addr, src, sizeof(struct in_addr));
getnameinfo((struct sockaddr *)&in, sizeof(struct
sockaddr_in), dst, cnt, NULL, 0, NI_NUMERICHOST);
return dst;
}
else if (af == AF_INET6)
{
struct sockaddr_in6 in;
memset(&in, 0, sizeof(in));
in.sin6_family = AF_INET6;
memcpy(&in.sin6_addr, src, sizeof(struct in_addr6));
getnameinfo((struct sockaddr *)&in, sizeof(struct
sockaddr_in6), dst, cnt, NULL, 0, NI_NUMERICHOST);
return dst;
}
return NULL;
}
static int
inet_pton(int af, const char *src, void *dst)
{
struct addrinfo hints;
struct addrinfo *res;
struct addrinfo *ressave;
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = af;
if (getaddrinfo(src, NULL, &hints, &res) != 0)
return -1;
ressave = res;
while (res)
{
memcpy(dst, res->ai_addr, res->ai_addrlen);
res = res->ai_next;
}
freeaddrinfo(ressave);
return 0;
}
#endif
void
tr_netInit( void )
{
static int initialized = FALSE;
if( !initialized )
{
#ifdef WIN32
WSADATA wsaData;
WSAStartup( MAKEWORD( 2, 2 ), &wsaData );
#endif
initialized = TRUE;
}
}
void
tr_suspectAddress( const tr_address * a UNUSED, const char * source UNUSED )
{
/* this is overkill for a production environment,
* but useful in the nightly builds, so only compile it into the nightlies */
#ifdef TR_UNSTABLE
/* be really aggressive in what we report */
if( a->type == TR_AF_INET && !( ntohl( a->addr.addr4.s_addr ) & 0xff000000 ) )
tr_err( "Funny looking address %s from %s", tr_ntop_non_ts( a ), source );
/* /16s taken from ipv6 rib on 21 dec, 2008 */
/* this is really, really ugly. expedience over quality */
if( a->type == TR_AF_INET6 )
{
uint16_t slash16;
uint16_t valid[] = { 0x339, 0x2002, 0x2003, 0x2400, 0x2401, 0x2402,
0x2403, 0x2404, 0x2405, 0x2406, 0x2407, 0x2600, 0x2607, 0x2610,
0x2620, 0x2800, 0x2801, 0x2a00, 0x2a01, 0x0a02, 0x2001, 0x0000 };
uint16_t *p;
tr_bool good = FALSE;
p = valid;
memcpy( &slash16, &a->addr, 2 );
slash16 = ntohs( slash16 );
while( *p )
{
if( slash16 == *p )
good = TRUE;
p++;
}
if( !good && !IN6_IS_ADDR_V4MAPPED( &a->addr.addr6 ) )
tr_err( "Funny looking address %s from %s", tr_ntop_non_ts( a ), source );
}
#endif
}
const char *
tr_ntop( const tr_address * src, char * dst, int size )
{
assert( tr_isAddress( src ) );
if( src->type == TR_AF_INET )
return inet_ntop( AF_INET, &src->addr, dst, size );
else
return inet_ntop( AF_INET6, &src->addr, dst, size );
}
/*
* Non-threadsafe version of tr_ntop, which uses a static memory area for a buffer.
* This function is suitable to be called from libTransmission's networking code,
* which is single-threaded.
*/
const char *
tr_ntop_non_ts( const tr_address * src )
{
static char buf[INET6_ADDRSTRLEN];
return tr_ntop( src, buf, sizeof( buf ) );
}
tr_address *
tr_pton( const char * src, tr_address * dst )
{
int retval = inet_pton( AF_INET, src, &dst->addr );
if( retval < 0 )
return NULL;
else if( retval == 0 )
retval = inet_pton( AF_INET6, src, &dst->addr );
else
{
dst->type = TR_AF_INET;
return dst;
}
if( retval < 1 )
return NULL;
dst->type = TR_AF_INET6;
return dst;
}
void
tr_normalizeV4Mapped( tr_address * const addr )
{
assert( tr_isAddress( addr ) );
if( addr->type == TR_AF_INET6 && IN6_IS_ADDR_V4MAPPED( &addr->addr.addr6 ) )
{
addr->type = TR_AF_INET;
memcpy( &addr->addr.addr4.s_addr, addr->addr.addr6.s6_addr + 12, 4 );
}
}
/*
* Compare two tr_address structures.
* Returns:
* <0 if a < b
* >0 if a > b
* 0 if a == b
*/
int
tr_compareAddresses( const tr_address * a, const tr_address * b)
{
int addrlen;
assert( tr_isAddress( a ) );
assert( tr_isAddress( b ) );
/* IPv6 addresses are always "greater than" IPv4 */
if( a->type != b->type )
return a->type == TR_AF_INET ? 1 : -1;
if( a->type == TR_AF_INET )
addrlen = sizeof( struct in_addr );
else
addrlen = sizeof( struct in6_addr );
return memcmp( &a->addr, &b->addr, addrlen );
}
tr_bool
tr_net_hasIPv6( tr_port port )
{
static tr_bool alreadyDone = FALSE;
static tr_bool result = FALSE;
int s;
if( alreadyDone )
return result;
s = tr_netBindTCP( &tr_in6addr_any, port, TRUE );
if( s >= 0 || -s != EAFNOSUPPORT ) /* we support ipv6 */
{
result = TRUE;
tr_netClose( s );
}
alreadyDone = TRUE;
return result;
}
/***********************************************************************
* Socket list housekeeping
**********************************************************************/
struct tr_socketList
{
int socket;
tr_address addr;
tr_socketList * next;
};
tr_socketList *
tr_socketListAppend( tr_socketList * const head,
const tr_address * const addr )
{
tr_socketList * tmp;
assert( head );
assert( tr_isAddress( addr ) );
for( tmp = head; tmp->next; tmp = tmp->next );
tmp->next = tr_socketListNew( addr );
return tmp->next;
}
tr_socketList *
tr_socketListNew( const tr_address * const addr )
{
tr_socketList * tmp;
assert( tr_isAddress( addr ) );
tmp = tr_new( tr_socketList, 1 );
tmp->socket = -1;
tmp->addr = *addr;
tmp->next = NULL;
return tmp;
}
void
tr_socketListFree( tr_socketList * const head )
{
assert( head );
if( head->next )
tr_socketListFree( head->next );
tr_free( head );
}
void
tr_socketListRemove( tr_socketList * const head,
tr_socketList * const el)
{
tr_socketList * tmp;
assert( head );
assert( el );
for( tmp = head; tmp->next && tmp->next != el; tmp = tmp->next );
tmp->next = el->next;
el->next = NULL;
tr_socketListFree(el);
}
void
tr_socketListTruncate( tr_socketList * const head,
tr_socketList * const start )
{
tr_socketList * tmp;
assert( head );
assert( start );
for( tmp = head; tmp->next && tmp->next != start; tmp = tmp->next );
tr_socketListFree( start );
tmp->next = NULL;
}
#if 0
int
tr_socketListGetSocket( const tr_socketList * const el )
{
assert( el );
return el->socket;
}
const tr_address *
tr_socketListGetAddress( const tr_socketList * const el )
{
assert( el );
return &el->addr;
}
#endif
void
tr_socketListForEach( tr_socketList * const head,
void ( * cb ) ( int * const,
tr_address * const,
void * const),
void * const userData )
{
tr_socketList * tmp;
for( tmp = head; tmp; tmp = tmp->next )
cb( &tmp->socket, &tmp->addr, userData );
}
/***********************************************************************
* TCP sockets
**********************************************************************/
int
tr_netSetTOS( int s, int tos )
{
#ifdef IP_TOS
return setsockopt( s, IPPROTO_IP, IP_TOS, (char*)&tos, sizeof( tos ) );
#else
return 0;
#endif
}
static int
makeSocketNonBlocking( int fd )
{
if( fd >= 0 )
{
if( evutil_make_socket_nonblocking( fd ) )
{
int tmperrno;
tr_err( _( "Couldn't create socket: %s" ),
tr_strerror( sockerrno ) );
tmperrno = sockerrno;
tr_netClose( fd );
fd = -tmperrno;
}
}
return fd;
}
static int
createSocket( int domain, int type )
{
return makeSocketNonBlocking( tr_fdSocketCreate( domain, type ) );
}
static void
setSndBuf( tr_session * session UNUSED, int fd UNUSED )
{
#if 0
if( fd >= 0 )
{
const int sndbuf = session->so_sndbuf;
const int rcvbuf = session->so_rcvbuf;
setsockopt( fd, SOL_SOCKET, SO_SNDBUF, &sndbuf, sizeof( sndbuf ) );
setsockopt( fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, sizeof( rcvbuf ) );
}
#endif
}
static socklen_t
setup_sockaddr( const tr_address * addr,
tr_port port,
struct sockaddr_storage * sockaddr)
{
struct sockaddr_in sock4;
struct sockaddr_in6 sock6;
assert( tr_isAddress( addr ) );
if( addr->type == TR_AF_INET )
{
memset( &sock4, 0, sizeof( sock4 ) );
sock4.sin_family = AF_INET;
sock4.sin_addr.s_addr = addr->addr.addr4.s_addr;
sock4.sin_port = port;
memcpy( sockaddr, &sock4, sizeof( sock4 ) );
return sizeof( struct sockaddr_in );
}
else
{
memset( &sock6, 0, sizeof( sock6 ) );
sock6.sin6_family = AF_INET6;
sock6.sin6_port = port;
sock6.sin6_flowinfo = 0;
sock6.sin6_addr = addr->addr.addr6;
memcpy( sockaddr, &sock6, sizeof( sock6 ) );
return sizeof( struct sockaddr_in6 );
}
}
static tr_bool
isMulticastAddress( const tr_address * addr )
{
if( addr->type == TR_AF_INET && IN_MULTICAST( htonl( addr->addr.addr4.s_addr ) ) )
return TRUE;
if( addr->type == TR_AF_INET6 && ( addr->addr.addr6.s6_addr[0] == 0xff ) )
return TRUE;
return FALSE;
}
static TR_INLINE tr_bool
isIPv6LinkLocalAddress( const tr_address * addr )
{
if( addr->type == TR_AF_INET6 &&
IN6_IS_ADDR_LINKLOCAL( &addr->addr.addr6 ))
return TRUE;
return FALSE;
}
tr_bool
tr_isValidPeerAddress( const tr_address * addr, tr_port port )
{
if( isMulticastAddress( addr ) || isIPv6LinkLocalAddress( addr ) )
return FALSE;
if( port == 0 )
return FALSE;
return TRUE;
}
int
tr_netOpenTCP( tr_session * session,
const tr_address * addr,
tr_port port )
{
int s;
struct sockaddr_storage sock;
const int type = SOCK_STREAM;
socklen_t addrlen;
assert( tr_isAddress( addr ) );
if( isMulticastAddress( addr ) || isIPv6LinkLocalAddress( addr ))
return -EINVAL;
if( ( s = createSocket( ( addr->type == TR_AF_INET ? AF_INET : AF_INET6 ), type ) ) < 0 )
return s;
setSndBuf( session, s );
addrlen = setup_sockaddr( addr, port, &sock );
if( ( connect( s, (struct sockaddr *) &sock,
addrlen ) < 0 )
#ifdef WIN32
&& ( sockerrno != WSAEWOULDBLOCK )
#endif
&& ( sockerrno != EINPROGRESS ) )
{
int tmperrno;
tmperrno = sockerrno;
if( ( tmperrno != ENETUNREACH && tmperrno != EHOSTUNREACH )
|| addr->type == TR_AF_INET )
tr_err( _( "Couldn't connect socket %d to %s, port %d (errno %d - %s)" ),
s, tr_ntop_non_ts( addr ), (int)port, tmperrno,
tr_strerror( tmperrno ) );
tr_netClose( s );
s = -tmperrno;
}
tr_deepLog( __FILE__, __LINE__, NULL, "New OUTGOING connection %d (%s)",
s, tr_peerIoAddrStr( addr, port ) );
return s;
}
int
tr_netBindTCP( const tr_address * addr, tr_port port, tr_bool suppressMsgs )
{
int s;
struct sockaddr_storage sock;
const int type = SOCK_STREAM;
int addrlen;
int retval;
#if defined( SO_REUSEADDR ) || defined( SO_REUSEPORT ) || defined( IPV6_V6ONLY )
int optval = 1;
#endif
assert( tr_isAddress( addr ) );
if( ( s = createSocket( ( addr->type == TR_AF_INET ? AF_INET : AF_INET6 ),
type ) ) < 0 )
return s;
#ifdef SO_REUSEADDR
setsockopt( s, SOL_SOCKET, SO_REUSEADDR, (char*)&optval, sizeof( optval ) );
#endif
#ifdef IPV6_V6ONLY
if( addr->type == TR_AF_INET6 &&
( retval = setsockopt( s, IPPROTO_IPV6, IPV6_V6ONLY, &optval,
sizeof( optval ) ) ) == -1 ) {
/* the kernel may not support this. if not, ignore it */
if( errno != ENOPROTOOPT )
return -errno;
}
#endif
addrlen = setup_sockaddr( addr, htons( port ), &sock );
if( bind( s, (struct sockaddr *) &sock,
addrlen ) )
{
int tmperrno;
if( !suppressMsgs )
tr_err( _( "Couldn't bind port %d on %s: %s" ), port,
tr_ntop_non_ts( addr ), tr_strerror( sockerrno ) );
tmperrno = sockerrno;
tr_netClose( s );
return -tmperrno;
}
if( !suppressMsgs )
tr_dbg( "Bound socket %d to port %d on %s",
s, port, tr_ntop_non_ts( addr ) );
return s;
}
int
tr_netAccept( tr_session * session,
int b,
tr_address * addr,
tr_port * port )
{
int fd;
fd = makeSocketNonBlocking( tr_fdSocketAccept( b, addr, port ) );
setSndBuf( session, fd );
return fd;
}
void
tr_netClose( int s )
{
tr_fdSocketClose( s );
}
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