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transmission/libtransmission/platform.c

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/******************************************************************************
* $Id$
*
* 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.
*****************************************************************************/
#ifdef SYS_BEOS
#include <fs_info.h>
#include <FindDirectory.h>
#endif
#include <sys/types.h>
#include <dirent.h>
#include "transmission.h"
#if !defined( SYS_BEOS ) && !defined( __AMIGAOS4__ )
#include <pwd.h>
static char * tr_getHomeDirectory()
{
static char homeDirectory[MAX_PATH_LENGTH];
static int init = 0;
char * envHome;
struct passwd * pw;
if( init )
{
return homeDirectory;
}
envHome = getenv( "HOME" );
if( NULL == envHome )
{
pw = getpwuid( getuid() );
endpwent();
if( NULL == pw )
{
/* XXX need to handle this case */
return NULL;
}
envHome = pw->pw_dir;
}
snprintf( homeDirectory, MAX_PATH_LENGTH, "%s", envHome );
init = 1;
return homeDirectory;
}
#endif /* !SYS_BEOS && !__AMIGAOS4__ */
static void
tr_migrateResume( const char *oldDirectory, const char *newDirectory )
{
DIR * dirh;
struct dirent * dirp;
char oldFile[MAX_PATH_LENGTH];
char newFile[MAX_PATH_LENGTH];
if( ( dirh = opendir( oldDirectory ) ) )
{
while( ( dirp = readdir( dirh ) ) )
{
if( strncmp( "resume.", dirp->d_name, 7 ) )
{
continue;
}
snprintf( oldFile, MAX_PATH_LENGTH, "%s/%s",
oldDirectory, dirp->d_name );
snprintf( newFile, MAX_PATH_LENGTH, "%s/%s",
newDirectory, dirp->d_name );
rename( oldFile, newFile );
}
closedir( dirh );
}
}
char * tr_getPrefsDirectory()
{
static char prefsDirectory[MAX_PATH_LENGTH];
static int init = 0;
if( init )
{
return prefsDirectory;
}
#ifdef SYS_BEOS
find_directory( B_USER_SETTINGS_DIRECTORY, dev_for_path("/boot"),
true, prefsDirectory, MAX_PATH_LENGTH );
strcat( prefsDirectory, "/Transmission" );
#elif defined( SYS_DARWIN )
snprintf( prefsDirectory, MAX_PATH_LENGTH,
"%s/Library/Caches/Transmission", tr_getHomeDirectory() );
#elif defined(__AMIGAOS4__)
snprintf( prefsDirectory, MAX_PATH_LENGTH, "PROGDIR:.transmission" );
#else
snprintf( prefsDirectory, MAX_PATH_LENGTH, "%s/.transmission",
tr_getHomeDirectory() );
#endif
tr_mkdir( prefsDirectory );
init = 1;
#ifdef SYS_DARWIN
char oldDirectory[MAX_PATH_LENGTH];
snprintf( oldDirectory, MAX_PATH_LENGTH, "%s/.transmission",
tr_getHomeDirectory() );
tr_migrateResume( oldDirectory, prefsDirectory );
rmdir( oldDirectory );
#endif
return prefsDirectory;
}
char * tr_getCacheDirectory()
{
static char cacheDirectory[MAX_PATH_LENGTH];
static int init = 0;
if( init )
{
return cacheDirectory;
}
#ifdef SYS_BEOS
/* XXX hey Bryan, is this fine with you? */
snprintf( cacheDirectory, MAX_PATH_LENGTH, "%s/Cache",
tr_getPrefsDirectory() );
#elif defined( SYS_DARWIN )
snprintf( cacheDirectory, MAX_PATH_LENGTH, "%s",
tr_getPrefsDirectory() );
#else
snprintf( cacheDirectory, MAX_PATH_LENGTH, "%s/cache",
tr_getPrefsDirectory() );
#endif
tr_mkdir( cacheDirectory );
init = 1;
if( strcmp( tr_getPrefsDirectory(), cacheDirectory ) )
{
tr_migrateResume( tr_getPrefsDirectory(), cacheDirectory );
}
return cacheDirectory;
}
char * tr_getTorrentsDirectory()
{
static char torrentsDirectory[MAX_PATH_LENGTH];
static int init = 0;
if( init )
{
return torrentsDirectory;
}
#ifdef SYS_BEOS
/* XXX hey Bryan, is this fine with you? */
snprintf( torrentsDirectory, MAX_PATH_LENGTH, "%s/Torrents",
tr_getPrefsDirectory() );
#elif defined( SYS_DARWIN )
snprintf( torrentsDirectory, MAX_PATH_LENGTH,
"%s/Library/Application Support/Transmission/Torrents",
tr_getHomeDirectory() );
#else
snprintf( torrentsDirectory, MAX_PATH_LENGTH, "%s/torrents",
tr_getPrefsDirectory() );
#endif
tr_mkdir( torrentsDirectory );
init = 1;
return torrentsDirectory;
}
void tr_threadCreate( tr_thread_t * t, void (*func)(void *), void * arg )
{
#ifdef SYS_BEOS
*t = spawn_thread( (void *) func, "torrent-tx", B_NORMAL_PRIORITY, arg );
resume_thread( *t );
#else
pthread_create( t, NULL, (void *) func, arg );
#endif
}
void tr_threadJoin( tr_thread_t * t )
{
#ifdef SYS_BEOS
long exit;
wait_for_thread( *t, &exit );
#else
pthread_join( *t, NULL );
#endif
}
void tr_lockInit( tr_lock_t * l )
{
#ifdef SYS_BEOS
*l = create_sem( 1, "" );
#else
pthread_mutex_init( l, NULL );
#endif
}
void tr_lockClose( tr_lock_t * l )
{
#ifdef SYS_BEOS
delete_sem( *l );
#else
pthread_mutex_destroy( l );
#endif
}
#if defined( BSD )
#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( errno ) );
}
*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( errno ) );
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( errno ) );
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( errno ) );
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( errno ) );
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 != errno )
{
tr_err( "failed to read from routing socket (%s)",
strerror( errno ) );
}
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
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