429 lines
11 KiB
C
429 lines
11 KiB
C
/******************************************************************************
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* $Id$
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*
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* Copyright (c) 2005-2006 Transmission authors and contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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#include "transmission.h"
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/***********************************************************************
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* DNS resolution
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**********************************************************************/
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/***********************************************************************
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* tr_netResolve
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***********************************************************************
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* Synchronous "resolution": only works with character strings
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* representing numbers expressed in the Internet standard `.' notation.
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* Returns a non-zero value if an error occurs.
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**********************************************************************/
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int tr_netResolve( const char * address, struct in_addr * addr )
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{
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addr->s_addr = inet_addr( address );
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return ( addr->s_addr == 0xFFFFFFFF );
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}
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static tr_thread_t resolveThread;
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static tr_lock_t resolveLock;
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static tr_cond_t resolveCond;
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static volatile int resolveDie;
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static tr_resolve_t * resolveQueue;
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static void resolveRelease ( tr_resolve_t * );
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static void resolveFunc ( void * );
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struct tr_resolve_s
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{
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tr_tristate_t status;
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char * address;
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struct in_addr addr;
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int refcount;
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tr_resolve_t * next;
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};
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/***********************************************************************
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* tr_netResolveThreadInit
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***********************************************************************
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* Initializes the static variables used for resolution and launch the
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* gethostbyname thread.
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**********************************************************************/
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void tr_netResolveThreadInit()
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{
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resolveDie = 0;
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resolveQueue = NULL;
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tr_lockInit( &resolveLock );
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tr_condInit( &resolveCond );
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tr_threadCreate( &resolveThread, resolveFunc, NULL, "resolve" );
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}
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/***********************************************************************
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* tr_netResolveThreadClose
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***********************************************************************
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* Notices the gethostbyname thread that is should terminate. Doesn't
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* wait until it does, in case it is stuck in a resolution: we let it
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* die and clean itself up.
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**********************************************************************/
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void tr_netResolveThreadClose()
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{
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tr_lockLock( &resolveLock );
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resolveDie = 1;
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tr_lockUnlock( &resolveLock );
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tr_condSignal( &resolveCond );
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tr_wait( 200 );
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}
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/***********************************************************************
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* tr_netResolveInit
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***********************************************************************
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* Adds an address to the resolution queue.
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**********************************************************************/
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tr_resolve_t * tr_netResolveInit( const char * address )
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{
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tr_resolve_t * r;
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r = malloc( sizeof( tr_resolve_t ) );
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r->status = TR_NET_WAIT;
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r->address = strdup( address );
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r->refcount = 2;
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r->next = NULL;
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tr_lockLock( &resolveLock );
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if( !resolveQueue )
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{
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resolveQueue = r;
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}
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else
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{
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tr_resolve_t * iter;
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for( iter = resolveQueue; iter->next; iter = iter->next );
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iter->next = r;
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}
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tr_lockUnlock( &resolveLock );
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tr_condSignal( &resolveCond );
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return r;
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}
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/***********************************************************************
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* tr_netResolvePulse
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***********************************************************************
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* Checks the current status of a resolution.
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**********************************************************************/
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tr_tristate_t tr_netResolvePulse( tr_resolve_t * r, struct in_addr * addr )
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{
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tr_tristate_t ret;
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tr_lockLock( &resolveLock );
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ret = r->status;
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if( ret == TR_NET_OK )
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{
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*addr = r->addr;
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}
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tr_lockUnlock( &resolveLock );
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return ret;
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}
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/***********************************************************************
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* tr_netResolveClose
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***********************************************************************
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*
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**********************************************************************/
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void tr_netResolveClose( tr_resolve_t * r )
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{
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resolveRelease( r );
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}
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/***********************************************************************
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* resolveRelease
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***********************************************************************
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* The allocated tr_resolve_t structures should be freed when
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* tr_netResolveClose was called *and* it was removed from the queue.
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* This can happen in any order, so we use a refcount to know we can
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* take it out.
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**********************************************************************/
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static void resolveRelease( tr_resolve_t * r )
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{
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if( --r->refcount < 1 )
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{
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free( r->address );
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free( r );
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}
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}
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/***********************************************************************
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* resolveFunc
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***********************************************************************
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* Keeps waiting for addresses to resolve, and removes them from the
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* queue once resolution is done.
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**********************************************************************/
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static void resolveFunc( void * arg UNUSED )
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{
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tr_resolve_t * r;
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struct hostent * host;
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tr_lockLock( &resolveLock );
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while( !resolveDie )
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{
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if( !( r = resolveQueue ) )
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{
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tr_condWait( &resolveCond, &resolveLock );
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continue;
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}
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/* Blocking resolution */
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tr_lockUnlock( &resolveLock );
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host = gethostbyname( r->address );
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tr_lockLock( &resolveLock );
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if( host )
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{
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memcpy( &r->addr, host->h_addr, host->h_length );
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r->status = TR_NET_OK;
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}
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else
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{
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r->status = TR_NET_ERROR;
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}
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resolveQueue = r->next;
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resolveRelease( r );
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}
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/* Clean up */
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tr_lockUnlock( &resolveLock );
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tr_lockClose( &resolveLock );
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while( ( r = resolveQueue ) )
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{
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resolveQueue = r->next;
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resolveRelease( r );
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}
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}
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/***********************************************************************
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* TCP/UDP sockets
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**********************************************************************/
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static int makeSocketNonBlocking( int s )
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{
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int flags;
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#ifdef SYS_BEOS
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flags = 1;
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if( setsockopt( s, SOL_SOCKET, SO_NONBLOCK,
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&flags, sizeof( int ) ) < 0 )
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#else
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if( ( flags = fcntl( s, F_GETFL, 0 ) ) < 0 ||
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fcntl( s, F_SETFL, flags | O_NONBLOCK ) < 0 )
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#endif
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{
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tr_err( "Could not set socket to non-blocking mode (%s)",
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strerror( errno ) );
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tr_netClose( s );
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return -1;
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}
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return s;
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}
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static int createSocket( int type, int priority )
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{
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int s;
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if( ( s = tr_fdSocketCreate( type, priority ) ) < 0 )
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{
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return -1;
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}
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return makeSocketNonBlocking( s );
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}
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int tr_netOpen( struct in_addr addr, in_port_t port, int type, int priority )
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{
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int s;
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struct sockaddr_in sock;
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if( ( s = createSocket( type, priority ) ) < 0 )
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{
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return -1;
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}
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memset( &sock, 0, sizeof( sock ) );
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sock.sin_family = AF_INET;
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sock.sin_addr.s_addr = addr.s_addr;
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sock.sin_port = port;
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if( connect( s, (struct sockaddr *) &sock,
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sizeof( struct sockaddr_in ) ) < 0 &&
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errno != EINPROGRESS )
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{
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tr_err( "Could not connect socket (%s)", strerror( errno ) );
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tr_netClose( s );
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return -1;
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}
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return s;
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}
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#ifdef IP_ADD_MEMBERSHIP
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int tr_netMcastOpen( int port, struct in_addr addr )
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{
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int fd;
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struct ip_mreq req;
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fd = tr_netBindUDP( port );
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if( 0 > fd )
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{
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return -1;
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}
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memset( &req, 0, sizeof( req ) );
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req.imr_multiaddr.s_addr = addr.s_addr;
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req.imr_interface.s_addr = htonl( INADDR_ANY );
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if( setsockopt( fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &req, sizeof ( req ) ) )
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{
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tr_err( "Could not join multicast group (%s)", strerror( errno ) );
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tr_netClose( fd );
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return -1;
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}
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return fd;
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}
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#else /* IP_ADD_MEMBERSHIP */
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int tr_netMcastOpen( int port UNUSED, struct in_addr addr UNUSED )
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{
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return -1;
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}
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#endif /* IP_ADD_MEMBERSHIP */
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int tr_netBind( int port, int type )
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{
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int s;
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struct sockaddr_in sock;
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#if defined( SO_REUSEADDR ) || defined( SO_REUSEPORT )
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int optval;
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#endif
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if( ( s = createSocket( type, 1 ) ) < 0 )
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{
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return -1;
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}
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#ifdef SO_REUSEADDR
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optval = 1;
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setsockopt( s, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof( optval ) );
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#endif
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#ifdef SO_REUSEPORT
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if( SOCK_DGRAM == type )
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{
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optval = 1;
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setsockopt( s, SOL_SOCKET, SO_REUSEPORT, &optval, sizeof( optval ) );
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}
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#endif
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memset( &sock, 0, sizeof( sock ) );
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sock.sin_family = AF_INET;
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sock.sin_addr.s_addr = INADDR_ANY;
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sock.sin_port = htons( port );
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if( bind( s, (struct sockaddr *) &sock,
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sizeof( struct sockaddr_in ) ) )
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{
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tr_err( "Could not bind port %d", port );
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tr_netClose( s );
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return -1;
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}
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return s;
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}
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int tr_netAccept( int b, struct in_addr * addr, in_port_t * port )
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{
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int s;
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if( ( s = tr_fdSocketAccept( b, addr, port ) ) < 0 )
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{
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return -1;
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}
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return makeSocketNonBlocking( s );
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}
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int tr_netSend( int s, uint8_t * buf, int size )
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{
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int ret;
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ret = send( s, buf, size, 0 );
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if( ret < 0 )
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{
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if( errno == ENOTCONN || errno == EAGAIN || errno == EWOULDBLOCK )
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{
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ret = TR_NET_BLOCK;
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}
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else
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{
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ret = TR_NET_CLOSE;
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}
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}
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return ret;
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}
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int tr_netRecvFrom( int s, uint8_t * buf, int size, struct sockaddr_in * addr )
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{
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socklen_t len;
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int ret;
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len = ( NULL == addr ? 0 : sizeof( *addr ) );
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ret = recvfrom( s, buf, size, 0, ( struct sockaddr * ) addr, &len );
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if( ret < 0 )
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{
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if( errno == EAGAIN || errno == EWOULDBLOCK )
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{
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ret = TR_NET_BLOCK;
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}
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else
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{
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ret = TR_NET_CLOSE;
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}
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}
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if( !ret )
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{
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ret = TR_NET_CLOSE;
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}
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return ret;
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}
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void tr_netClose( int s )
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{
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tr_fdSocketClose( s );
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}
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void tr_netNtop( const struct in_addr * addr, char * buf, int len )
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{
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const uint8_t * cast;
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cast = (const uint8_t *)addr;
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snprintf( buf, len, "%hhu.%hhu.%hhu.%hhu",
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cast[0], cast[1], cast[2], cast[3] );
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}
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