/* preload given regular device to channel */
static void RegularChannel(struct ChannelDesc* channel, int n)
{
int h;
ZLOGS(LOG_DEBUG, "preload regular %s", channel->alias);
switch(CH_RW_TYPE(channel))
{
case 1: /* read only */
h = open(CH_NAME(channel, n), O_RDONLY, CHANNEL_RIGHTS);
CH_HANDLE(channel, n) = GINT_TO_POINTER(h);
channel->size = GetFileSize(CH_NAME(channel, n));
ZLOGFAIL(channel->size < 0, EFAULT, "cannot open %s", CH_NAME(channel, n));
break;
case 2: /* write only. existing file will be overwritten */
h = open(CH_NAME(channel, n), O_WRONLY|O_CREAT|O_TRUNC, CHANNEL_RIGHTS);
CH_HANDLE(channel, n) = GINT_TO_POINTER(h);
channel->size = 0;
if(g_strcmp0(CH_NAME(channel, n), DEV_NULL) != 0)
PreallocateChannel(channel, n);
break;
case 3: /* cdr or full random access */
ZLOGFAIL(channel->type == SGetSPut, EFAULT,
"sequential channels cannot have r/w access");
ZLOGFAIL(channel->type == SGetRPut, EFAULT,
"sequential read / random write channels not supported");
/* open the file and ensure that putpos is not greater than the file size */
h = open(CH_NAME(channel, n), O_RDWR | O_CREAT, CHANNEL_RIGHTS);
CH_HANDLE(channel, n) = GINT_TO_POINTER(h);
channel->size = GetFileSize(CH_NAME(channel, n));
ZLOGFAIL(channel->size < 0, EFAULT, "cannot open %s", CH_NAME(channel, n));
ZLOGFAIL(channel->putpos > channel->size, EFAULT,
"%s size is less then specified append position", CH_NAME(channel, n));
/* file does not exist */
if(channel->size == 0 && g_strcmp0(CH_NAME(channel, n), DEV_NULL) != 0)
PreallocateChannel(channel, n);
/* existing file */
else
channel->putpos = channel->type == RGetSPut ? channel->size : 0;
break;
default:
ZLOGFAIL(1, EINVAL, "%s has invalid i/o type", channel->alias);
break;
}
ZLOGFAIL(GPOINTER_TO_INT(CH_HANDLE(channel, n)) < 0,
errno, "%s open error", CH_NAME(channel, n));
}
/*
* preload given file (channel). return 0 if success, otherwise negative errcode
*/
int PreloadChannel(struct NaClApp *nap, struct PreOpenedFileDesc* channel)
{
/* debug checks */
if(!channel->name) return -1; /* channel is not constructed. skip it */
COND_ABORT(channel->mounted != LOADED, "channel is not supposed to be loaded\n");
/* open file */
channel->handle = open((char*)channel->name, GetChannelOpenFlags(channel), S_IRWXU);
COND_ABORT(channel->handle < 0, "channel open error\n");
/* check if given file in bounds of manifest limits */
channel->fsize = GetFileSize((char*)channel->name);
PreallocateChannel(channel);
COND_ABORT(channel->max_size < channel->fsize,
"channel legnth exceeded policy limit\n");
/* mounting finalization */
channel->bsize = -1; /* will be provided by user */
return 0;
}
/*
* premap given file (channel). return 0 if success, otherwise negative errcode
* note: malloc()
*/
int PremapChannel(struct NaClApp *nap, struct PreOpenedFileDesc* channel)
{
int desc;
struct NaClHostDesc *hd = malloc(sizeof(*hd));
/* debug checks */
COND_ABORT(!hd, "cannot allocate memory to hold channel descriptor\n");
COND_ABORT(!channel, "channel is not constructed\n");
COND_ABORT(channel->mounted != MAPPED, "channel is not supposed to be mapped\n");
COND_ABORT(!channel->name, "cannot resolve channel name\n");
/* open file */
channel->handle = open((char*)channel->name, GetChannelOpenFlags(channel), S_IRWXU);
COND_ABORT(channel->handle < 0, "channel open error\n");
/* check if given file in bounds of manifest limits */
channel->fsize = GetFileSize((char*)channel->name);
PreallocateChannel(channel);
COND_ABORT(channel->max_size < channel->fsize, "channel legnth exceeded policy limit\n");
/* construct nacl descriptor */
hd->d = channel->handle;
desc = NaClSetAvail(nap, ((struct NaClDesc *) NaClDescIoDescMake(hd)));
/* map whole file into the memory. address cannot be higher than stack */
channel->buffer = NaClCommonSysMmapIntern(nap, NULL, channel->fsize,
GetChannelMapProt(channel), GetChannelMapFlags(channel), desc, 0);
COND_ABORT((uint32_t)channel->buffer > 0xFF000000, "channel map error\n");
/* mounting finalization */
close(channel->handle);
channel->bsize = channel->fsize; /* yes. mapped file always put to memory whole */
channel->handle = -1; /* there is no opened file for mapped channel */
return 0;
}
