1017 lines
22 KiB
C
1017 lines
22 KiB
C
/******************************************************************************
|
|
* $Id$
|
|
*
|
|
* Copyright (c) 2005 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 <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#ifdef __BEOS__
|
|
#include <signal.h>
|
|
#include <fs_info.h>
|
|
#include <FindDirectory.h>
|
|
#include <kernel/OS.h>
|
|
#define BEOS_MAX_THREADS 256
|
|
#elif defined(WIN32)
|
|
#include <windows.h>
|
|
#include <shlobj.h> /* for CSIDL_APPDATA, CSIDL_PROFILE */
|
|
#else
|
|
#include <pthread.h>
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
#include <dirent.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h> /* getuid getpid close */
|
|
|
|
#include "transmission.h"
|
|
#include "list.h"
|
|
#include "net.h"
|
|
#include "platform.h"
|
|
#include "utils.h"
|
|
|
|
/***
|
|
**** THREADS
|
|
***/
|
|
|
|
#ifdef __BEOS__
|
|
typedef thread_id tr_thread_id;
|
|
#elif defined(WIN32)
|
|
typedef DWORD tr_thread_id;
|
|
#else
|
|
typedef pthread_t tr_thread_id;
|
|
#endif
|
|
|
|
static tr_thread_id
|
|
tr_getCurrentThread( void )
|
|
{
|
|
#ifdef __BEOS__
|
|
return find_thread( NULL );
|
|
#elif defined(WIN32)
|
|
return GetCurrentThreadId();
|
|
#else
|
|
return pthread_self( );
|
|
#endif
|
|
}
|
|
|
|
static int
|
|
tr_areThreadsEqual( tr_thread_id a, tr_thread_id b )
|
|
{
|
|
#ifdef __BEOS__
|
|
return a == b;
|
|
#elif defined(WIN32)
|
|
return a == b;
|
|
#else
|
|
return pthread_equal( a, b );
|
|
#endif
|
|
}
|
|
|
|
struct tr_thread
|
|
{
|
|
void (* func ) ( void * );
|
|
void * arg;
|
|
const char * name;
|
|
|
|
#ifdef __BEOS__
|
|
thread_id thread;
|
|
#elif defined(WIN32)
|
|
HANDLE thread;
|
|
unsigned int thread_id;
|
|
#else
|
|
pthread_t thread;
|
|
#endif
|
|
|
|
};
|
|
|
|
int
|
|
tr_amInThread ( const tr_thread * t )
|
|
{
|
|
return tr_areThreadsEqual( tr_getCurrentThread(), t->thread );
|
|
}
|
|
|
|
#ifdef WIN32
|
|
#define ThreadFuncReturnType unsigned WINAPI
|
|
#else
|
|
#define ThreadFuncReturnType void
|
|
#endif
|
|
|
|
static ThreadFuncReturnType
|
|
ThreadFunc( void * _t )
|
|
{
|
|
tr_thread * t = _t;
|
|
const char * name = t->name;
|
|
|
|
#ifdef __BEOS__
|
|
/* This is required because on BeOS, SIGINT is sent to each thread,
|
|
which kills them not nicely */
|
|
signal( SIGINT, SIG_IGN );
|
|
#endif
|
|
|
|
tr_dbg( "Thread '%s' started", name );
|
|
t->func( t->arg );
|
|
tr_dbg( "Thread '%s' exited", name );
|
|
|
|
#ifdef WIN32
|
|
_endthreadex( 0 );
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
tr_thread *
|
|
tr_threadNew( void (*func)(void *),
|
|
void * arg,
|
|
const char * name )
|
|
{
|
|
tr_thread * t = tr_new0( tr_thread, 1 );
|
|
t->func = func;
|
|
t->arg = arg;
|
|
t->name = name;
|
|
|
|
#ifdef __BEOS__
|
|
t->thread = spawn_thread( (void*)ThreadFunc, name, B_NORMAL_PRIORITY, t );
|
|
resume_thread( t->thread );
|
|
#elif defined(WIN32)
|
|
t->thread = (HANDLE) _beginthreadex( NULL, 0, &ThreadFunc, t, 0, &t->thread_id );
|
|
#else
|
|
pthread_create( &t->thread, NULL, (void * (*) (void *)) ThreadFunc, t );
|
|
#endif
|
|
|
|
return t;
|
|
}
|
|
|
|
void
|
|
tr_threadJoin( tr_thread * t )
|
|
{
|
|
if( t != NULL )
|
|
{
|
|
#ifdef __BEOS__
|
|
long exit;
|
|
wait_for_thread( t->thread, &exit );
|
|
#elif defined(WIN32)
|
|
WaitForSingleObject( t->thread, INFINITE );
|
|
CloseHandle( t->thread );
|
|
#else
|
|
pthread_join( t->thread, NULL );
|
|
#endif
|
|
|
|
tr_dbg( "Thread '%s' joined", t->name );
|
|
t->name = NULL;
|
|
t->func = NULL;
|
|
tr_free( t );
|
|
}
|
|
}
|
|
|
|
/***
|
|
**** LOCKS
|
|
***/
|
|
|
|
struct tr_lock
|
|
{
|
|
uint32_t depth;
|
|
#ifdef __BEOS__
|
|
sem_id lock;
|
|
thread_id lockThread;
|
|
#elif defined(WIN32)
|
|
CRITICAL_SECTION lock;
|
|
DWORD lockThread;
|
|
#else
|
|
pthread_mutex_t lock;
|
|
pthread_t lockThread;
|
|
#endif
|
|
};
|
|
|
|
tr_lock*
|
|
tr_lockNew( void )
|
|
{
|
|
tr_lock * l = tr_new0( tr_lock, 1 );
|
|
|
|
#ifdef __BEOS__
|
|
l->lock = create_sem( 1, "" );
|
|
#elif defined(WIN32)
|
|
InitializeCriticalSection( &l->lock );
|
|
#else
|
|
pthread_mutex_init( &l->lock, NULL );
|
|
#endif
|
|
|
|
return l;
|
|
}
|
|
|
|
void
|
|
tr_lockFree( tr_lock * l )
|
|
{
|
|
#ifdef __BEOS__
|
|
delete_sem( l->lock );
|
|
#elif defined(WIN32)
|
|
DeleteCriticalSection( &l->lock );
|
|
#else
|
|
pthread_mutex_destroy( &l->lock );
|
|
#endif
|
|
tr_free( l );
|
|
}
|
|
|
|
int
|
|
tr_lockTryLock( tr_lock * l ) /* success on zero! */
|
|
{
|
|
#ifdef __BEOS__
|
|
return acquire_sem_etc( l->lock, 1, B_RELATIVE_TIMEOUT, 0 );
|
|
#elif defined(WIN32)
|
|
return !TryEnterCriticalSection( &l->lock );
|
|
#else
|
|
return pthread_mutex_trylock( &l->lock );
|
|
#endif
|
|
}
|
|
|
|
void
|
|
tr_lockLock( tr_lock * l )
|
|
{
|
|
tr_thread_id currentThread = tr_getCurrentThread( );
|
|
if( l->lockThread == currentThread )
|
|
{
|
|
++l->depth;
|
|
}
|
|
else
|
|
{
|
|
#ifdef __BEOS__
|
|
acquire_sem( l->lock );
|
|
#elif defined(WIN32)
|
|
EnterCriticalSection( &l->lock );
|
|
#else
|
|
pthread_mutex_lock( &l->lock );
|
|
#endif
|
|
l->lockThread = tr_getCurrentThread( );
|
|
l->depth = 1;
|
|
}
|
|
}
|
|
|
|
int
|
|
tr_lockHave( const tr_lock * l )
|
|
{
|
|
return ( l->depth > 0 )
|
|
&& ( l->lockThread == tr_getCurrentThread() );
|
|
}
|
|
|
|
void
|
|
tr_lockUnlock( tr_lock * l )
|
|
{
|
|
assert( tr_lockHave( l ) );
|
|
|
|
if( !--l->depth )
|
|
{
|
|
l->lockThread = 0;
|
|
#ifdef __BEOS__
|
|
release_sem( l->lock );
|
|
#elif defined(WIN32)
|
|
LeaveCriticalSection( &l->lock );
|
|
#else
|
|
pthread_mutex_unlock( &l->lock );
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/***
|
|
**** COND
|
|
***/
|
|
|
|
struct tr_cond
|
|
{
|
|
#ifdef __BEOS__
|
|
sem_id sem;
|
|
thread_id threads[BEOS_MAX_THREADS];
|
|
int start, end;
|
|
#elif defined(WIN32)
|
|
tr_list * events;
|
|
tr_lock * lock;
|
|
#else
|
|
pthread_cond_t cond;
|
|
#endif
|
|
};
|
|
|
|
#ifdef WIN32
|
|
static DWORD getContEventTLS( void )
|
|
{
|
|
static int inited = FALSE;
|
|
static DWORD event_tls;
|
|
if( !inited ) {
|
|
inited = TRUE;
|
|
event_tls = TlsAlloc();
|
|
}
|
|
return event_tls;
|
|
}
|
|
#endif
|
|
|
|
tr_cond*
|
|
tr_condNew( void )
|
|
{
|
|
tr_cond * c = tr_new0( tr_cond, 1 );
|
|
#ifdef __BEOS__
|
|
c->sem = create_sem( 1, "" );
|
|
c->start = 0;
|
|
c->end = 0;
|
|
#elif defined(WIN32)
|
|
c->events = NULL;
|
|
c->lock = tr_lockNew( );
|
|
#else
|
|
pthread_cond_init( &c->cond, NULL );
|
|
#endif
|
|
return c;
|
|
}
|
|
|
|
void
|
|
tr_condWait( tr_cond * c, tr_lock * l )
|
|
{
|
|
#ifdef __BEOS__
|
|
|
|
/* Keep track of that thread */
|
|
acquire_sem( c->sem );
|
|
c->threads[c->end] = find_thread( NULL );
|
|
c->end = ( c->end + 1 ) % BEOS_MAX_THREADS;
|
|
assert( c->end != c->start ); /* We hit BEOS_MAX_THREADS, arggh */
|
|
release_sem( c->sem );
|
|
|
|
release_sem( l->lock );
|
|
suspend_thread( find_thread( NULL ) ); /* Wait for signal */
|
|
acquire_sem( l->lock );
|
|
|
|
#elif defined(WIN32)
|
|
|
|
/* get this thread's cond event */
|
|
DWORD key = getContEventTLS ( );
|
|
HANDLE hEvent = TlsGetValue( key );
|
|
if( !hEvent ) {
|
|
hEvent = CreateEvent( 0, FALSE, FALSE, 0 );
|
|
TlsSetValue( key, hEvent );
|
|
}
|
|
|
|
/* add it to the list of events waiting to be signaled */
|
|
tr_lockLock( c->lock );
|
|
tr_list_append( &c->events, hEvent );
|
|
tr_lockUnlock( c->lock );
|
|
|
|
/* now wait for it to be signaled */
|
|
tr_lockUnlock( l );
|
|
WaitForSingleObject( hEvent, INFINITE );
|
|
tr_lockLock( l );
|
|
|
|
/* remove it from the list of events waiting to be signaled */
|
|
tr_lockLock( c->lock );
|
|
tr_list_remove_data( &c->events, hEvent );
|
|
tr_lockUnlock( c->lock );
|
|
|
|
#else
|
|
|
|
pthread_cond_wait( &c->cond, &l->lock );
|
|
|
|
#endif
|
|
}
|
|
|
|
#ifdef __BEOS__
|
|
static int condTrySignal( tr_cond * c )
|
|
{
|
|
if( c->start == c->end )
|
|
return 1;
|
|
|
|
for( ;; )
|
|
{
|
|
thread_info info;
|
|
get_thread_info( c->threads[c->start], &info );
|
|
if( info.state == B_THREAD_SUSPENDED )
|
|
{
|
|
resume_thread( c->threads[c->start] );
|
|
c->start = ( c->start + 1 ) % BEOS_MAX_THREADS;
|
|
break;
|
|
}
|
|
/* The thread is not suspended yet, which can happen since
|
|
* tr_condWait does not atomically suspends after releasing
|
|
* the semaphore. Wait a bit and try again. */
|
|
snooze( 5000 );
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
void
|
|
tr_condSignal( tr_cond * c )
|
|
{
|
|
#ifdef __BEOS__
|
|
|
|
acquire_sem( c->sem );
|
|
condTrySignal( c );
|
|
release_sem( c->sem );
|
|
|
|
#elif defined(WIN32)
|
|
|
|
tr_lockLock( c->lock );
|
|
if( c->events != NULL )
|
|
SetEvent( (HANDLE)c->events->data );
|
|
tr_lockUnlock( c->lock );
|
|
|
|
#else
|
|
|
|
pthread_cond_signal( &c->cond );
|
|
|
|
#endif
|
|
}
|
|
|
|
void
|
|
tr_condBroadcast( tr_cond * c )
|
|
{
|
|
#ifdef __BEOS__
|
|
|
|
acquire_sem( c->sem );
|
|
while( !condTrySignal( c ) );
|
|
release_sem( c->sem );
|
|
|
|
#elif defined(WIN32)
|
|
|
|
tr_list * l;
|
|
tr_lockLock( c->lock );
|
|
for( l=c->events; l!=NULL; l=l->next )
|
|
SetEvent( (HANDLE)l->data );
|
|
tr_lockUnlock( c->lock );
|
|
|
|
#else
|
|
|
|
pthread_cond_broadcast( &c->cond );
|
|
|
|
#endif
|
|
}
|
|
|
|
void
|
|
tr_condFree( tr_cond * c )
|
|
{
|
|
#ifdef __BEOS__
|
|
delete_sem( c->sem );
|
|
#elif defined(WIN32)
|
|
tr_list_free( &c->events, NULL );
|
|
tr_lockFree( c->lock );
|
|
#else
|
|
pthread_cond_destroy( &c->cond );
|
|
#endif
|
|
tr_free( c );
|
|
}
|
|
|
|
|
|
/***
|
|
**** PATHS
|
|
***/
|
|
|
|
#if !defined(WIN32) && !defined(__BEOS__) && !defined(__AMIGAOS4__)
|
|
#include <pwd.h>
|
|
#endif
|
|
|
|
const char *
|
|
tr_getHomeDirectory( void )
|
|
{
|
|
static char buf[MAX_PATH_LENGTH];
|
|
static int init = 0;
|
|
const char * envHome;
|
|
|
|
if( init )
|
|
return buf;
|
|
|
|
envHome = getenv( "HOME" );
|
|
if( envHome )
|
|
snprintf( buf, sizeof(buf), "%s", envHome );
|
|
else {
|
|
#ifdef WIN32
|
|
SHGetFolderPath( NULL, CSIDL_PROFILE, NULL, 0, buf );
|
|
#elif defined(__BEOS__) || defined(__AMIGAOS4__)
|
|
*buf = '\0';
|
|
#else
|
|
struct passwd * pw = getpwuid( getuid() );
|
|
endpwent();
|
|
if( pw != NULL )
|
|
snprintf( buf, sizeof(buf), "%s", pw->pw_dir );
|
|
#endif
|
|
}
|
|
|
|
init = 1;
|
|
return buf;
|
|
}
|
|
|
|
|
|
static void
|
|
tr_migrateResume( const char *oldDirectory, const char *newDirectory )
|
|
{
|
|
DIR * dirh = opendir( oldDirectory );
|
|
|
|
if( dirh != NULL )
|
|
{
|
|
struct dirent * dirp;
|
|
|
|
while( ( dirp = readdir( dirh ) ) )
|
|
{
|
|
if( !strncmp( "resume.", dirp->d_name, 7 ) )
|
|
{
|
|
char o[MAX_PATH_LENGTH];
|
|
char n[MAX_PATH_LENGTH];
|
|
tr_buildPath( o, sizeof(o), oldDirectory, dirp->d_name, NULL );
|
|
tr_buildPath( n, sizeof(n), newDirectory, dirp->d_name, NULL );
|
|
rename( o, n );
|
|
}
|
|
}
|
|
|
|
closedir( dirh );
|
|
}
|
|
}
|
|
|
|
const char *
|
|
tr_getPrefsDirectory( void )
|
|
{
|
|
static char buf[MAX_PATH_LENGTH];
|
|
static int init = 0;
|
|
static size_t buflen = sizeof(buf);
|
|
const char* h;
|
|
|
|
if( init )
|
|
return buf;
|
|
|
|
h = tr_getHomeDirectory();
|
|
#ifdef __BEOS__
|
|
find_directory( B_USER_SETTINGS_DIRECTORY,
|
|
dev_for_path("/boot"), true, buf, buflen );
|
|
strcat( buf, "/Transmission" );
|
|
#elif defined( SYS_DARWIN )
|
|
tr_buildPath ( buf, buflen, h,
|
|
"Library", "Application Support", "Transmission", NULL );
|
|
#elif defined(__AMIGAOS4__)
|
|
snprintf( buf, buflen, "PROGDIR:.transmission" );
|
|
#elif defined(WIN32)
|
|
{
|
|
char tmp[MAX_PATH_LENGTH];
|
|
SHGetFolderPath( NULL, CSIDL_APPDATA, NULL, 0, tmp );
|
|
tr_buildPath( buf, sizeof(buf), tmp, "Transmission", NULL );
|
|
buflen = strlen( buf );
|
|
}
|
|
#else
|
|
tr_buildPath ( buf, buflen, h, ".transmission", NULL );
|
|
#endif
|
|
|
|
tr_mkdirp( buf, 0700 );
|
|
init = 1;
|
|
|
|
#ifdef SYS_DARWIN
|
|
char old[MAX_PATH_LENGTH];
|
|
tr_buildPath ( old, sizeof(old), h, ".transmission", NULL );
|
|
tr_migrateResume( old, buf );
|
|
rmdir( old );
|
|
#endif
|
|
|
|
return buf;
|
|
}
|
|
|
|
const char *
|
|
tr_getCacheDirectory( void )
|
|
{
|
|
static char buf[MAX_PATH_LENGTH];
|
|
static int init = 0;
|
|
static const size_t buflen = sizeof(buf);
|
|
const char * p;
|
|
|
|
if( init )
|
|
return buf;
|
|
|
|
p = tr_getPrefsDirectory();
|
|
#if defined(__BEOS__) || defined(WIN32)
|
|
tr_buildPath( buf, buflen, p, "Cache", NULL );
|
|
#elif defined( SYS_DARWIN )
|
|
tr_buildPath( buf, buflen, tr_getHomeDirectory(),
|
|
"Library", "Caches", "Transmission", NULL );
|
|
#else
|
|
tr_buildPath( buf, buflen, p, "cache", NULL );
|
|
#endif
|
|
|
|
tr_mkdirp( buf, 0700 );
|
|
init = 1;
|
|
|
|
if( strcmp( p, buf ) )
|
|
tr_migrateResume( p, buf );
|
|
|
|
return buf;
|
|
}
|
|
|
|
const char *
|
|
tr_getTorrentsDirectory( void )
|
|
{
|
|
static char buf[MAX_PATH_LENGTH];
|
|
static int init = 0;
|
|
static const size_t buflen = sizeof(buf);
|
|
const char * p;
|
|
|
|
if( init )
|
|
return buf;
|
|
|
|
p = tr_getPrefsDirectory ();
|
|
|
|
#if defined(__BEOS__) || defined(WIN32)
|
|
tr_buildPath( buf, buflen, p, "Torrents", NULL );
|
|
#elif defined( SYS_DARWIN )
|
|
tr_buildPath( buf, buflen, p, "Torrents", NULL );
|
|
#else
|
|
tr_buildPath( buf, buflen, p, "torrents", NULL );
|
|
#endif
|
|
|
|
tr_mkdirp( buf, 0700 );
|
|
init = 1;
|
|
return buf;
|
|
}
|
|
|
|
/***
|
|
**** SOCKETS
|
|
***/
|
|
|
|
#ifdef BSD
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
#include <netinet/in.h> /* struct in_addr */
|
|
#include <sys/sysctl.h>
|
|
#include <net/route.h>
|
|
|
|
static uint8_t *
|
|
getroute( int * buflen );
|
|
static int
|
|
parseroutes( uint8_t * buf, int len, struct in_addr * addr );
|
|
|
|
int
|
|
tr_getDefaultRoute( struct in_addr * addr )
|
|
{
|
|
uint8_t * buf;
|
|
int len;
|
|
|
|
buf = getroute( &len );
|
|
if( NULL == buf )
|
|
{
|
|
tr_err( "failed to get default route (BSD)" );
|
|
return 1;
|
|
}
|
|
|
|
len = parseroutes( buf, len, addr );
|
|
free( buf );
|
|
|
|
return len;
|
|
}
|
|
|
|
#ifndef SA_SIZE
|
|
#define ROUNDUP( a, size ) \
|
|
( ( (a) & ( (size) - 1 ) ) ? ( 1 + ( (a) | ( (size) - 1 ) ) ) : (a) )
|
|
#define SA_SIZE( sap ) \
|
|
( sap->sa_len ? ROUNDUP( (sap)->sa_len, sizeof( u_long ) ) : \
|
|
sizeof( u_long ) )
|
|
#endif /* !SA_SIZE */
|
|
#define NEXT_SA( sap ) \
|
|
(struct sockaddr *) ( (caddr_t) (sap) + ( SA_SIZE( (sap) ) ) )
|
|
|
|
static uint8_t *
|
|
getroute( int * buflen )
|
|
{
|
|
int mib[6];
|
|
size_t len;
|
|
uint8_t * buf;
|
|
|
|
mib[0] = CTL_NET;
|
|
mib[1] = PF_ROUTE;
|
|
mib[2] = 0;
|
|
mib[3] = AF_INET;
|
|
mib[4] = NET_RT_FLAGS;
|
|
mib[5] = RTF_GATEWAY;
|
|
|
|
if( sysctl( mib, 6, NULL, &len, NULL, 0 ) )
|
|
{
|
|
if( ENOENT != errno )
|
|
{
|
|
tr_err( "sysctl net.route.0.inet.flags.gateway failed (%s)",
|
|
strerror( sockerrno ) );
|
|
}
|
|
*buflen = 0;
|
|
return NULL;
|
|
}
|
|
|
|
buf = malloc( len );
|
|
if( NULL == buf )
|
|
{
|
|
*buflen = 0;
|
|
return NULL;
|
|
}
|
|
|
|
if( sysctl( mib, 6, buf, &len, NULL, 0 ) )
|
|
{
|
|
tr_err( "sysctl net.route.0.inet.flags.gateway failed (%s)",
|
|
strerror( sockerrno ) );
|
|
free( buf );
|
|
*buflen = 0;
|
|
return NULL;
|
|
}
|
|
|
|
*buflen = len;
|
|
|
|
return buf;
|
|
}
|
|
|
|
static int
|
|
parseroutes( uint8_t * buf, int len, struct in_addr * addr )
|
|
{
|
|
uint8_t * end;
|
|
struct rt_msghdr * rtm;
|
|
struct sockaddr * sa;
|
|
struct sockaddr_in * sin;
|
|
int ii;
|
|
struct in_addr dest, gw;
|
|
|
|
end = buf + len;
|
|
while( end > buf + sizeof( *rtm ) )
|
|
{
|
|
rtm = (struct rt_msghdr *) buf;
|
|
buf += rtm->rtm_msglen;
|
|
if( end >= buf )
|
|
{
|
|
dest.s_addr = INADDR_NONE;
|
|
gw.s_addr = INADDR_NONE;
|
|
sa = (struct sockaddr *) ( rtm + 1 );
|
|
|
|
for( ii = 0; ii < RTAX_MAX && (uint8_t *) sa < buf; ii++ )
|
|
{
|
|
if( buf < (uint8_t *) NEXT_SA( sa ) )
|
|
{
|
|
break;
|
|
}
|
|
|
|
if( rtm->rtm_addrs & ( 1 << ii ) )
|
|
{
|
|
if( AF_INET == sa->sa_family )
|
|
{
|
|
sin = (struct sockaddr_in *) sa;
|
|
switch( ii )
|
|
{
|
|
case RTAX_DST:
|
|
dest = sin->sin_addr;
|
|
break;
|
|
case RTAX_GATEWAY:
|
|
gw = sin->sin_addr;
|
|
break;
|
|
}
|
|
}
|
|
sa = NEXT_SA( sa );
|
|
}
|
|
}
|
|
|
|
if( INADDR_ANY == dest.s_addr && INADDR_NONE != gw.s_addr )
|
|
{
|
|
*addr = gw;
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
#elif defined( linux ) || defined( __linux ) || defined( __linux__ )
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/netlink.h>
|
|
#include <linux/rtnetlink.h>
|
|
|
|
#define SEQNUM 195909
|
|
|
|
static int
|
|
getsock( void );
|
|
static uint8_t *
|
|
getroute( int fd, unsigned int * buflen );
|
|
static int
|
|
parseroutes( uint8_t * buf, unsigned int len, struct in_addr * addr );
|
|
|
|
int
|
|
tr_getDefaultRoute( struct in_addr * addr )
|
|
{
|
|
int fd, ret;
|
|
unsigned int len;
|
|
uint8_t * buf;
|
|
|
|
ret = 1;
|
|
fd = getsock();
|
|
if( 0 <= fd )
|
|
{
|
|
while( ret )
|
|
{
|
|
buf = getroute( fd, &len );
|
|
if( NULL == buf )
|
|
{
|
|
break;
|
|
}
|
|
ret = parseroutes( buf, len, addr );
|
|
free( buf );
|
|
}
|
|
close( fd );
|
|
}
|
|
|
|
if( ret )
|
|
{
|
|
tr_err( "failed to get default route (Linux)" );
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
getsock( void )
|
|
{
|
|
int fd, flags;
|
|
struct
|
|
{
|
|
struct nlmsghdr nlh;
|
|
struct rtgenmsg rtg;
|
|
} req;
|
|
struct sockaddr_nl snl;
|
|
|
|
fd = socket( PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE );
|
|
if( 0 > fd )
|
|
{
|
|
tr_err( "failed to create routing socket (%s)", strerror( sockerrno ) );
|
|
return -1;
|
|
}
|
|
|
|
flags = fcntl( fd, F_GETFL );
|
|
if( 0 > flags || 0 > fcntl( fd, F_SETFL, O_NONBLOCK | flags ) )
|
|
{
|
|
tr_err( "failed to set socket nonblocking (%s)", strerror( sockerrno ) );
|
|
close( fd );
|
|
return -1;
|
|
}
|
|
|
|
bzero( &snl, sizeof( snl ) );
|
|
snl.nl_family = AF_NETLINK;
|
|
|
|
bzero( &req, sizeof( req ) );
|
|
req.nlh.nlmsg_len = NLMSG_LENGTH( sizeof( req.rtg ) );
|
|
req.nlh.nlmsg_type = RTM_GETROUTE;
|
|
req.nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
|
|
req.nlh.nlmsg_seq = SEQNUM;
|
|
req.nlh.nlmsg_pid = 0;
|
|
req.rtg.rtgen_family = AF_INET;
|
|
|
|
if( 0 > sendto( fd, &req, sizeof( req ), 0,
|
|
(struct sockaddr *) &snl, sizeof( snl ) ) )
|
|
{
|
|
tr_err( "failed to write to routing socket (%s)", strerror( sockerrno ) );
|
|
close( fd );
|
|
return -1;
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
static uint8_t *
|
|
getroute( int fd, unsigned int * buflen )
|
|
{
|
|
void * buf;
|
|
unsigned int len;
|
|
ssize_t res;
|
|
struct sockaddr_nl snl;
|
|
socklen_t slen;
|
|
|
|
len = 8192;
|
|
buf = calloc( 1, len );
|
|
if( NULL == buf )
|
|
{
|
|
*buflen = 0;
|
|
return NULL;
|
|
}
|
|
|
|
for( ;; )
|
|
{
|
|
bzero( &snl, sizeof( snl ) );
|
|
slen = sizeof( snl );
|
|
res = recvfrom( fd, buf, len, 0, (struct sockaddr *) &snl, &slen );
|
|
if( 0 > res )
|
|
{
|
|
if( EAGAIN != sockerrno )
|
|
{
|
|
tr_err( "failed to read from routing socket (%s)",
|
|
strerror( sockerrno ) );
|
|
}
|
|
free( buf );
|
|
*buflen = 0;
|
|
return NULL;
|
|
}
|
|
if( slen < sizeof( snl ) || AF_NETLINK != snl.nl_family )
|
|
{
|
|
tr_err( "bad address" );
|
|
free( buf );
|
|
*buflen = 0;
|
|
return NULL;
|
|
}
|
|
|
|
if( 0 == snl.nl_pid )
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
*buflen = res;
|
|
|
|
return buf;
|
|
}
|
|
|
|
static int
|
|
parseroutes( uint8_t * buf, unsigned int len, struct in_addr * addr )
|
|
{
|
|
struct nlmsghdr * nlm;
|
|
struct nlmsgerr * nle;
|
|
struct rtmsg * rtm;
|
|
struct rtattr * rta;
|
|
int rtalen;
|
|
struct in_addr gw, dst;
|
|
|
|
nlm = ( struct nlmsghdr * ) buf;
|
|
while( NLMSG_OK( nlm, len ) )
|
|
{
|
|
gw.s_addr = INADDR_ANY;
|
|
dst.s_addr = INADDR_ANY;
|
|
if( NLMSG_ERROR == nlm->nlmsg_type )
|
|
{
|
|
nle = (struct nlmsgerr *) NLMSG_DATA( nlm );
|
|
if( NLMSG_LENGTH( NLMSG_ALIGN( sizeof( struct nlmsgerr ) ) ) >
|
|
nlm->nlmsg_len )
|
|
{
|
|
tr_err( "truncated netlink error" );
|
|
}
|
|
else
|
|
{
|
|
tr_err( "netlink error (%s)", strerror( nle->error ) );
|
|
}
|
|
return 1;
|
|
}
|
|
else if( RTM_NEWROUTE == nlm->nlmsg_type && SEQNUM == nlm->nlmsg_seq &&
|
|
getpid() == (pid_t) nlm->nlmsg_pid &&
|
|
NLMSG_LENGTH( sizeof( struct rtmsg ) ) <= nlm->nlmsg_len )
|
|
{
|
|
rtm = NLMSG_DATA( nlm );
|
|
rta = RTM_RTA( rtm );
|
|
rtalen = RTM_PAYLOAD( nlm );
|
|
|
|
while( RTA_OK( rta, rtalen ) )
|
|
{
|
|
if( sizeof( struct in_addr ) <= RTA_PAYLOAD( rta ) )
|
|
{
|
|
switch( rta->rta_type )
|
|
{
|
|
case RTA_GATEWAY:
|
|
memcpy( &gw, RTA_DATA( rta ), sizeof( gw ) );
|
|
break;
|
|
case RTA_DST:
|
|
memcpy( &dst, RTA_DATA( rta ), sizeof( dst ) );
|
|
break;
|
|
}
|
|
}
|
|
rta = RTA_NEXT( rta, rtalen );
|
|
}
|
|
}
|
|
|
|
if( INADDR_NONE != gw.s_addr && INADDR_ANY != gw.s_addr &&
|
|
INADDR_ANY == dst.s_addr )
|
|
{
|
|
*addr = gw;
|
|
return 0;
|
|
}
|
|
|
|
nlm = NLMSG_NEXT( nlm, len );
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
#else /* not BSD or Linux */
|
|
|
|
int
|
|
tr_getDefaultRoute( struct in_addr * addr UNUSED )
|
|
{
|
|
tr_inf( "don't know how to get default route on this platform" );
|
|
return 1;
|
|
}
|
|
|
|
#endif
|